drivers/char/synclinkmp.c

   1 /*
   2  * $Id: synclinkmp.c,v 4.38 2005/07/15 13:29:44 paulkf Exp $
   3  *
   4  * Device driver for Microgate SyncLink Multiport
   5  * high speed multiprotocol serial adapter.
   6  *
   7  * written by Paul Fulghum for Microgate Corporation
   8  * paulkf@microgate.com
   9  *
  10  * Microgate and SyncLink are trademarks of Microgate Corporation
  11  *
  12  * Derived from serial.c written by Theodore Ts'o and Linus Torvalds
  13  * This code is released under the GNU General Public License (GPL)
  14  *
  15  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  16  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  18  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
  19  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  23  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  25  * OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #define VERSION(ver,rel,seq) (((ver)<<16) | ((rel)<<8) | (seq))
  29 #if defined(__i386__)
  30 #  define BREAKPOINT() asm("   int $3");
  31 #else
  32 #  define BREAKPOINT() { }
  33 #endif
  34
  35 #define MAX_DEVICES 12
  36
  37 #include <linux/module.h>
  38 #include <linux/errno.h>
  39 #include <linux/signal.h>
  40 #include <linux/sched.h>
  41 #include <linux/timer.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/pci.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/serial.h>
  47 #include <linux/major.h>
  48 #include <linux/string.h>
  49 #include <linux/fcntl.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/ioport.h>
  52 #include <linux/mm.h>
  53 #include <linux/slab.h>
  54 #include <linux/netdevice.h>
  55 #include <linux/vmalloc.h>
  56 #include <linux/init.h>
  57 #include <linux/delay.h>
  58 #include <linux/ioctl.h>
  59
  60 #include <asm/system.h>
  61 #include <asm/io.h>
  62 #include <asm/irq.h>
  63 #include <asm/dma.h>
  64 #include <linux/bitops.h>
  65 #include <asm/types.h>
  66 #include <linux/termios.h>
  67 #include <linux/workqueue.h>
  68 #include <linux/hdlc.h>
  69
  70 #if defined(CONFIG_HDLC) || (defined(CONFIG_HDLC_MODULE) && defined(CONFIG_SYNCLINKMP_MODULE))
  71 #define SYNCLINK_GENERIC_HDLC 1
  72 #else
  73 #define SYNCLINK_GENERIC_HDLC 0
  74 #endif
  75
  76 #define GET_USER(error,value,addr) error = get_user(value,addr)
  77 #define COPY_FROM_USER(error,dest,src,size) error = copy_from_user(dest,src,size) ? -EFAULT : 0
  78 #define PUT_USER(error,value,addr) error = put_user(value,addr)
  79 #define COPY_TO_USER(error,dest,src,size) error = copy_to_user(dest,src,size) ? -EFAULT : 0
  80
  81 #include <asm/uaccess.h>
  82
  83 #include "linux/synclink.h"
  84
  85 static MGSL_PARAMS default_params = {
  86         MGSL_MODE_HDLC,                 /* unsigned long mode */
  87         0,                              /* unsigned char loopback; */
  88         HDLC_FLAG_UNDERRUN_ABORT15,     /* unsigned short flags; */
  89         HDLC_ENCODING_NRZI_SPACE,       /* unsigned char encoding; */
  90         0,                              /* unsigned long clock_speed; */
  91         0xff,                           /* unsigned char addr_filter; */
  92         HDLC_CRC_16_CCITT,              /* unsigned short crc_type; */
  93         HDLC_PREAMBLE_LENGTH_8BITS,     /* unsigned char preamble_length; */
  94         HDLC_PREAMBLE_PATTERN_NONE,     /* unsigned char preamble; */
  95         9600,                           /* unsigned long data_rate; */
  96         8,                              /* unsigned char data_bits; */
  97         1,                              /* unsigned char stop_bits; */
  98         ASYNC_PARITY_NONE               /* unsigned char parity; */
  99 };
 100
 101 /* size in bytes of DMA data buffers */
 102 #define SCABUFSIZE      1024
 103 #define SCA_MEM_SIZE    0x40000
 104 #define SCA_BASE_SIZE   512
 105 #define SCA_REG_SIZE    16
 106 #define SCA_MAX_PORTS   4
 107 #define SCAMAXDESC      128
 108
 109 #define BUFFERLISTSIZE  4096
 110
 111 /* SCA-I style DMA buffer descriptor */
 112 typedef struct _SCADESC
 113 {
 114         u16     next;           /* lower l6 bits of next descriptor addr */
 115         u16     buf_ptr;        /* lower 16 bits of buffer addr */
 116         u8      buf_base;       /* upper 8 bits of buffer addr */
 117         u8      pad1;
 118         u16     length;         /* length of buffer */
 119         u8      status;         /* status of buffer */
 120         u8      pad2;
 121 } SCADESC, *PSCADESC;
 122
 123 typedef struct _SCADESC_EX
 124 {
 125         /* device driver bookkeeping section */
 126         char    *virt_addr;     /* virtual address of data buffer */
 127         u16     phys_entry;     /* lower 16-bits of physical address of this descriptor */
 128 } SCADESC_EX, *PSCADESC_EX;
 129
 130 /* The queue of BH actions to be performed */
 131
 132 #define BH_RECEIVE  1
 133 #define BH_TRANSMIT 2
 134 #define BH_STATUS   4
 135
 136 #define IO_PIN_SHUTDOWN_LIMIT 100
 137
 138 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
 139
 140 struct  _input_signal_events {
 141         int     ri_up;
 142         int     ri_down;
 143         int     dsr_up;
 144         int     dsr_down;
 145         int     dcd_up;
 146         int     dcd_down;
 147         int     cts_up;
 148         int     cts_down;
 149 };
 150
 151 /*
 152  * Device instance data structure
 153  */
 154 typedef struct _synclinkmp_info {
 155         void *if_ptr;                           /* General purpose pointer (used by SPPP) */
 156         int                     magic;
 157         int                     flags;
 158         int                     count;          /* count of opens */
 159         int                     line;
 160         unsigned short          close_delay;
 161         unsigned short          closing_wait;   /* time to wait before closing */
 162
 163         struct mgsl_icount      icount;
 164
 165         struct tty_struct       *tty;
 166         int                     timeout;
 167         int                     x_char;         /* xon/xoff character */
 168         int                     blocked_open;   /* # of blocked opens */
 169         u16                     read_status_mask1;  /* break detection (SR1 indications) */
 170         u16                     read_status_mask2;  /* parity/framing/overun (SR2 indications) */
 171         unsigned char           ignore_status_mask1;  /* break detection (SR1 indications) */
 172         unsigned char           ignore_status_mask2;  /* parity/framing/overun (SR2 indications) */
 173         unsigned char           *tx_buf;
 174         int                     tx_put;
 175         int                     tx_get;
 176         int                     tx_count;
 177
 178         wait_queue_head_t       open_wait;
 179         wait_queue_head_t       close_wait;
 180
 181         wait_queue_head_t       status_event_wait_q;
 182         wait_queue_head_t       event_wait_q;
 183         struct timer_list       tx_timer;       /* HDLC transmit timeout timer */
 184         struct _synclinkmp_info *next_device;   /* device list link */
 185         struct timer_list       status_timer;   /* input signal status check timer */
 186
 187         spinlock_t lock;                /* spinlock for synchronizing with ISR */
 188         struct work_struct task;                        /* task structure for scheduling bh */
 189
 190         u32 max_frame_size;                     /* as set by device config */
 191
 192         u32 pending_bh;
 193
 194         int bh_running;                         /* Protection from multiple */
 195         int isr_overflow;
 196         int bh_requested;
 197
 198         int dcd_chkcount;                       /* check counts to prevent */
 199         int cts_chkcount;                       /* too many IRQs if a signal */
 200         int dsr_chkcount;                       /* is floating */
 201         int ri_chkcount;
 202
 203         char *buffer_list;                      /* virtual address of Rx & Tx buffer lists */
 204         unsigned long buffer_list_phys;
 205
 206         unsigned int rx_buf_count;              /* count of total allocated Rx buffers */
 207         SCADESC *rx_buf_list;                   /* list of receive buffer entries */
 208         SCADESC_EX rx_buf_list_ex[SCAMAXDESC]; /* list of receive buffer entries */
 209         unsigned int current_rx_buf;
 210
 211         unsigned int tx_buf_count;              /* count of total allocated Tx buffers */
 212         SCADESC *tx_buf_list;           /* list of transmit buffer entries */
 213         SCADESC_EX tx_buf_list_ex[SCAMAXDESC]; /* list of transmit buffer entries */
 214         unsigned int last_tx_buf;
 215
 216         unsigned char *tmp_rx_buf;
 217         unsigned int tmp_rx_buf_count;
 218
 219         int rx_enabled;
 220         int rx_overflow;
 221
 222         int tx_enabled;
 223         int tx_active;
 224         u32 idle_mode;
 225
 226         unsigned char ie0_value;
 227         unsigned char ie1_value;
 228         unsigned char ie2_value;
 229         unsigned char ctrlreg_value;
 230         unsigned char old_signals;
 231
 232         char device_name[25];                   /* device instance name */
 233
 234         int port_count;
 235         int adapter_num;
 236         int port_num;
 237
 238         struct _synclinkmp_info *port_array[SCA_MAX_PORTS];
 239
 240         unsigned int bus_type;                  /* expansion bus type (ISA,EISA,PCI) */
 241
 242         unsigned int irq_level;                 /* interrupt level */
 243         unsigned long irq_flags;
 244         int irq_requested;                      /* nonzero if IRQ requested */
 245
 246         MGSL_PARAMS params;                     /* communications parameters */
 247
 248         unsigned char serial_signals;           /* current serial signal states */
 249
 250         int irq_occurred;                       /* for diagnostics use */
 251         unsigned int init_error;                /* Initialization startup error */
 252
 253         u32 last_mem_alloc;
 254         unsigned char* memory_base;             /* shared memory address (PCI only) */
 255         u32 phys_memory_base;
 256         int shared_mem_requested;
 257
 258         unsigned char* sca_base;                /* HD64570 SCA Memory address */
 259         u32 phys_sca_base;
 260         u32 sca_offset;
 261         int sca_base_requested;
 262
 263         unsigned char* lcr_base;                /* local config registers (PCI only) */
 264         u32 phys_lcr_base;
 265         u32 lcr_offset;
 266         int lcr_mem_requested;
 267
 268         unsigned char* statctrl_base;           /* status/control register memory */
 269         u32 phys_statctrl_base;
 270         u32 statctrl_offset;
 271         int sca_statctrl_requested;
 272
 273         u32 misc_ctrl_value;
 274         char flag_buf[MAX_ASYNC_BUFFER_SIZE];
 275         char char_buf[MAX_ASYNC_BUFFER_SIZE];
 276         BOOLEAN drop_rts_on_tx_done;
 277
 278         struct  _input_signal_events    input_signal_events;
 279
 280         /* SPPP/Cisco HDLC device parts */
 281         int netcount;
 282         int dosyncppp;
 283         spinlock_t netlock;
 284
 285 #if SYNCLINK_GENERIC_HDLC
 286         struct net_device *netdev;
 287 #endif
 288
 289 } SLMP_INFO;
 290
 291 #define MGSL_MAGIC 0x5401
 292
 293 /*
 294  * define serial signal status change macros
 295  */
 296 #define MISCSTATUS_DCD_LATCHED  (SerialSignal_DCD<<8)   /* indicates change in DCD */
 297 #define MISCSTATUS_RI_LATCHED   (SerialSignal_RI<<8)    /* indicates change in RI */
 298 #define MISCSTATUS_CTS_LATCHED  (SerialSignal_CTS<<8)   /* indicates change in CTS */
 299 #define MISCSTATUS_DSR_LATCHED  (SerialSignal_DSR<<8)   /* change in DSR */
 300
 301 /* Common Register macros */
 302 #define LPR     0x00
 303 #define PABR0   0x02
 304 #define PABR1   0x03
 305 #define WCRL    0x04
 306 #define WCRM    0x05
 307 #define WCRH    0x06
 308 #define DPCR    0x08
 309 #define DMER    0x09
 310 #define ISR0    0x10
 311 #define ISR1    0x11
 312 #define ISR2    0x12
 313 #define IER0    0x14
 314 #define IER1    0x15
 315 #define IER2    0x16
 316 #define ITCR    0x18
 317 #define INTVR   0x1a
 318 #define IMVR    0x1c
 319
 320 /* MSCI Register macros */
 321 #define TRB     0x20
 322 #define TRBL    0x20
 323 #define TRBH    0x21
 324 #define SR0     0x22
 325 #define SR1     0x23
 326 #define SR2     0x24
 327 #define SR3     0x25
 328 #define FST     0x26
 329 #define IE0     0x28
 330 #define IE1     0x29
 331 #define IE2     0x2a
 332 #define FIE     0x2b
 333 #define CMD     0x2c
 334 #define MD0     0x2e
 335 #define MD1     0x2f
 336 #define MD2     0x30
 337 #define CTL     0x31
 338 #define SA0     0x32
 339 #define SA1     0x33
 340 #define IDL     0x34
 341 #define TMC     0x35
 342 #define RXS     0x36
 343 #define TXS     0x37
 344 #define TRC0    0x38
 345 #define TRC1    0x39
 346 #define RRC     0x3a
 347 #define CST0    0x3c
 348 #define CST1    0x3d
 349
 350 /* Timer Register Macros */
 351 #define TCNT    0x60
 352 #define TCNTL   0x60
 353 #define TCNTH   0x61
 354 #define TCONR   0x62
 355 #define TCONRL  0x62
 356 #define TCONRH  0x63
 357 #define TMCS    0x64
 358 #define TEPR    0x65
 359
 360 /* DMA Controller Register macros */
 361 #define DARL    0x80
 362 #define DARH    0x81
 363 #define DARB    0x82
 364 #define BAR     0x80
 365 #define BARL    0x80
 366 #define BARH    0x81
 367 #define BARB    0x82
 368 #define SAR     0x84
 369 #define SARL    0x84
 370 #define SARH    0x85
 371 #define SARB    0x86
 372 #define CPB     0x86
 373 #define CDA     0x88
 374 #define CDAL    0x88
 375 #define CDAH    0x89
 376 #define EDA     0x8a
 377 #define EDAL    0x8a
 378 #define EDAH    0x8b
 379 #define BFL     0x8c
 380 #define BFLL    0x8c
 381 #define BFLH    0x8d
 382 #define BCR     0x8e
 383 #define BCRL    0x8e
 384 #define BCRH    0x8f
 385 #define DSR     0x90
 386 #define DMR     0x91
 387 #define FCT     0x93
 388 #define DIR     0x94
 389 #define DCMD    0x95
 390
 391 /* combine with timer or DMA register address */
 392 #define TIMER0  0x00
 393 #define TIMER1  0x08
 394 #define TIMER2  0x10
 395 #define TIMER3  0x18
 396 #define RXDMA   0x00
 397 #define TXDMA   0x20
 398
 399 /* SCA Command Codes */
 400 #define NOOP            0x00
 401 #define TXRESET         0x01
 402 #define TXENABLE        0x02
 403 #define TXDISABLE       0x03
 404 #define TXCRCINIT       0x04
 405 #define TXCRCEXCL       0x05
 406 #define TXEOM           0x06
 407 #define TXABORT         0x07
 408 #define MPON            0x08
 409 #define TXBUFCLR        0x09
 410 #define RXRESET         0x11
 411 #define RXENABLE        0x12
 412 #define RXDISABLE       0x13
 413 #define RXCRCINIT       0x14
 414 #define RXREJECT        0x15
 415 #define SEARCHMP        0x16
 416 #define RXCRCEXCL       0x17
 417 #define RXCRCCALC       0x18
 418 #define CHRESET         0x21
 419 #define HUNT            0x31
 420
 421 /* DMA command codes */
 422 #define SWABORT         0x01
 423 #define FEICLEAR        0x02
 424
 425 /* IE0 */
 426 #define TXINTE          BIT7
 427 #define RXINTE          BIT6
 428 #define TXRDYE          BIT1
 429 #define RXRDYE          BIT0
 430
 431 /* IE1 & SR1 */
 432 #define UDRN    BIT7
 433 #define IDLE    BIT6
 434 #define SYNCD   BIT4
 435 #define FLGD    BIT4
 436 #define CCTS    BIT3
 437 #define CDCD    BIT2
 438 #define BRKD    BIT1
 439 #define ABTD    BIT1
 440 #define GAPD    BIT1
 441 #define BRKE    BIT0
 442 #define IDLD    BIT0
 443
 444 /* IE2 & SR2 */
 445 #define EOM     BIT7
 446 #define PMP     BIT6
 447 #define SHRT    BIT6
 448 #define PE      BIT5
 449 #define ABT     BIT5
 450 #define FRME    BIT4
 451 #define RBIT    BIT4
 452 #define OVRN    BIT3
 453 #define CRCE    BIT2
 454
 455
 456 /*
 457  * Global linked list of SyncLink devices
 458  */
 459 static SLMP_INFO *synclinkmp_device_list = NULL;
 460 static int synclinkmp_adapter_count = -1;
 461 static int synclinkmp_device_count = 0;
 462
 463 /*
 464  * Set this param to non-zero to load eax with the
 465  * .text section address and breakpoint on module load.
 466  * This is useful for use with gdb and add-symbol-file command.
 467  */
 468 static int break_on_load=0;
 469
 470 /*
 471  * Driver major number, defaults to zero to get auto
 472  * assigned major number. May be forced as module parameter.
 473  */
 474 static int ttymajor=0;
 475
 476 /*
 477  * Array of user specified options for ISA adapters.
 478  */
 479 static int debug_level = 0;
 480 static int maxframe[MAX_DEVICES] = {0,};
 481 static int dosyncppp[MAX_DEVICES] = {0,};
 482
 483 module_param(break_on_load, bool, 0);
 484 module_param(ttymajor, int, 0);
 485 module_param(debug_level, int, 0);
 486 module_param_array(maxframe, int, NULL, 0);
 487 module_param_array(dosyncppp, int, NULL, 0);
 488
 489 static char *driver_name = "SyncLink MultiPort driver";
 490 static char *driver_version = "$Revision: 4.38 $";
 491
 492 static int synclinkmp_init_one(struct pci_dev *dev,const struct pci_device_id *ent);
 493 static void synclinkmp_remove_one(struct pci_dev *dev);
 494
 495 static struct pci_device_id synclinkmp_pci_tbl[] = {
 496         { PCI_VENDOR_ID_MICROGATE, PCI_DEVICE_ID_MICROGATE_SCA, PCI_ANY_ID, PCI_ANY_ID, },
 497         { 0, }, /* terminate list */
 498 };
 499 MODULE_DEVICE_TABLE(pci, synclinkmp_pci_tbl);
 500
 501 MODULE_LICENSE("GPL");
 502
 503 static struct pci_driver synclinkmp_pci_driver = {
 504         .name           = "synclinkmp",
 505         .id_table       = synclinkmp_pci_tbl,
 506         .probe          = synclinkmp_init_one,
 507         .remove         = __devexit_p(synclinkmp_remove_one),
 508 };
 509
 510
 511 static struct tty_driver *serial_driver;
 512
 513 /* number of characters left in xmit buffer before we ask for more */
 514 #define WAKEUP_CHARS 256
 515
 516
 517 /* tty callbacks */
 518
 519 static int  open(struct tty_struct *tty, struct file * filp);
 520 static void close(struct tty_struct *tty, struct file * filp);
 521 static void hangup(struct tty_struct *tty);
 522 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios);
 523
 524 static int  write(struct tty_struct *tty, const unsigned char *buf, int count);
 525 static void put_char(struct tty_struct *tty, unsigned char ch);
 526 static void send_xchar(struct tty_struct *tty, char ch);
 527 static void wait_until_sent(struct tty_struct *tty, int timeout);
 528 static int  write_room(struct tty_struct *tty);
 529 static void flush_chars(struct tty_struct *tty);
 530 static void flush_buffer(struct tty_struct *tty);
 531 static void tx_hold(struct tty_struct *tty);
 532 static void tx_release(struct tty_struct *tty);
 533
 534 static int  ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg);
 535 static int  read_proc(char *page, char **start, off_t off, int count,int *eof, void *data);
 536 static int  chars_in_buffer(struct tty_struct *tty);
 537 static void throttle(struct tty_struct * tty);
 538 static void unthrottle(struct tty_struct * tty);
 539 static void set_break(struct tty_struct *tty, int break_state);
 540
 541 #if SYNCLINK_GENERIC_HDLC
 542 #define dev_to_port(D) (dev_to_hdlc(D)->priv)
 543 static void hdlcdev_tx_done(SLMP_INFO *info);
 544 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size);
 545 static int  hdlcdev_init(SLMP_INFO *info);
 546 static void hdlcdev_exit(SLMP_INFO *info);
 547 #endif
 548
 549 /* ioctl handlers */
 550
 551 static int  get_stats(SLMP_INFO *info, struct mgsl_icount __user *user_icount);
 552 static int  get_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 553 static int  set_params(SLMP_INFO *info, MGSL_PARAMS __user *params);
 554 static int  get_txidle(SLMP_INFO *info, int __user *idle_mode);
 555 static int  set_txidle(SLMP_INFO *info, int idle_mode);
 556 static int  tx_enable(SLMP_INFO *info, int enable);
 557 static int  tx_abort(SLMP_INFO *info);
 558 static int  rx_enable(SLMP_INFO *info, int enable);
 559 static int  modem_input_wait(SLMP_INFO *info,int arg);
 560 static int  wait_mgsl_event(SLMP_INFO *info, int __user *mask_ptr);
 561 static int  tiocmget(struct tty_struct *tty, struct file *file);
 562 static int  tiocmset(struct tty_struct *tty, struct file *file,
 563                      unsigned int set, unsigned int clear);
 564 static void set_break(struct tty_struct *tty, int break_state);
 565
 566 static void add_device(SLMP_INFO *info);
 567 static void device_init(int adapter_num, struct pci_dev *pdev);
 568 static int  claim_resources(SLMP_INFO *info);
 569 static void release_resources(SLMP_INFO *info);
 570
 571 static int  startup(SLMP_INFO *info);
 572 static int  block_til_ready(struct tty_struct *tty, struct file * filp,SLMP_INFO *info);
 573 static void shutdown(SLMP_INFO *info);
 574 static void program_hw(SLMP_INFO *info);
 575 static void change_params(SLMP_INFO *info);
 576
 577 static int  init_adapter(SLMP_INFO *info);
 578 static int  register_test(SLMP_INFO *info);
 579 static int  irq_test(SLMP_INFO *info);
 580 static int  loopback_test(SLMP_INFO *info);
 581 static int  adapter_test(SLMP_INFO *info);
 582 static int  memory_test(SLMP_INFO *info);
 583
 584 static void reset_adapter(SLMP_INFO *info);
 585 static void reset_port(SLMP_INFO *info);
 586 static void async_mode(SLMP_INFO *info);
 587 static void hdlc_mode(SLMP_INFO *info);
 588
 589 static void rx_stop(SLMP_INFO *info);
 590 static void rx_start(SLMP_INFO *info);
 591 static void rx_reset_buffers(SLMP_INFO *info);
 592 static void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last);
 593 static int  rx_get_frame(SLMP_INFO *info);
 594
 595 static void tx_start(SLMP_INFO *info);
 596 static void tx_stop(SLMP_INFO *info);
 597 static void tx_load_fifo(SLMP_INFO *info);
 598 static void tx_set_idle(SLMP_INFO *info);
 599 static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count);
 600
 601 static void get_signals(SLMP_INFO *info);
 602 static void set_signals(SLMP_INFO *info);
 603 static void enable_loopback(SLMP_INFO *info, int enable);
 604 static void set_rate(SLMP_INFO *info, u32 data_rate);
 605
 606 static int  bh_action(SLMP_INFO *info);
 607 static void bh_handler(struct work_struct *work);
 608 static void bh_receive(SLMP_INFO *info);
 609 static void bh_transmit(SLMP_INFO *info);
 610 static void bh_status(SLMP_INFO *info);
 611 static void isr_timer(SLMP_INFO *info);
 612 static void isr_rxint(SLMP_INFO *info);
 613 static void isr_rxrdy(SLMP_INFO *info);
 614 static void isr_txint(SLMP_INFO *info);
 615 static void isr_txrdy(SLMP_INFO *info);
 616 static void isr_rxdmaok(SLMP_INFO *info);
 617 static void isr_rxdmaerror(SLMP_INFO *info);
 618 static void isr_txdmaok(SLMP_INFO *info);
 619 static void isr_txdmaerror(SLMP_INFO *info);
 620 static void isr_io_pin(SLMP_INFO *info, u16 status);
 621
 622 static int  alloc_dma_bufs(SLMP_INFO *info);
 623 static void free_dma_bufs(SLMP_INFO *info);
 624 static int  alloc_buf_list(SLMP_INFO *info);
 625 static int  alloc_frame_bufs(SLMP_INFO *info, SCADESC *list, SCADESC_EX *list_ex,int count);
 626 static int  alloc_tmp_rx_buf(SLMP_INFO *info);
 627 static void free_tmp_rx_buf(SLMP_INFO *info);
 628
 629 static void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count);
 630 static void trace_block(SLMP_INFO *info, const char* data, int count, int xmit);
 631 static void tx_timeout(unsigned long context);
 632 static void status_timeout(unsigned long context);
 633
 634 static unsigned char read_reg(SLMP_INFO *info, unsigned char addr);
 635 static void write_reg(SLMP_INFO *info, unsigned char addr, unsigned char val);
 636 static u16 read_reg16(SLMP_INFO *info, unsigned char addr);
 637 static void write_reg16(SLMP_INFO *info, unsigned char addr, u16 val);
 638 static unsigned char read_status_reg(SLMP_INFO * info);
 639 static void write_control_reg(SLMP_INFO * info);
 640
 641
 642 static unsigned char rx_active_fifo_level = 16; // rx request FIFO activation level in bytes
 643 static unsigned char tx_active_fifo_level = 16; // tx request FIFO activation level in bytes
 644 static unsigned char tx_negate_fifo_level = 32; // tx request FIFO negation level in bytes
 645
 646 static u32 misc_ctrl_value = 0x007e4040;
 647 static u32 lcr1_brdr_value = 0x00800028;
 648
 649 static u32 read_ahead_count = 8;
 650
 651 /* DPCR, DMA Priority Control
 652  *
 653  * 07..05  Not used, must be 0
 654  * 04      BRC, bus release condition: 0=all transfers complete
 655  *              1=release after 1 xfer on all channels
 656  * 03      CCC, channel change condition: 0=every cycle
 657  *              1=after each channel completes all xfers
 658  * 02..00  PR<2..0>, priority 100=round robin
 659  *
 660  * 00000100 = 0x00
 661  */
 662 static unsigned char dma_priority = 0x04;
 663
 664 // Number of bytes that can be written to shared RAM
 665 // in a single write operation
 666 static u32 sca_pci_load_interval = 64;
 667
 668 /*
 669  * 1st function defined in .text section. Calling this function in
 670  * init_module() followed by a breakpoint allows a remote debugger
 671  * (gdb) to get the .text address for the add-symbol-file command.
 672  * This allows remote debugging of dynamically loadable modules.
 673  */
 674 static void* synclinkmp_get_text_ptr(void);
 675 static void* synclinkmp_get_text_ptr(void) {return synclinkmp_get_text_ptr;}
 676
 677 static inline int sanity_check(SLMP_INFO *info,
 678                                char *name, const char *routine)
 679 {
 680 #ifdef SANITY_CHECK
 681         static const char *badmagic =
 682                 "Warning: bad magic number for synclinkmp_struct (%s) in %s\n";
 683         static const char *badinfo =
 684                 "Warning: null synclinkmp_struct for (%s) in %s\n";
 685
 686         if (!info) {
 687                 printk(badinfo, name, routine);
 688                 return 1;
 689         }
 690         if (info->magic != MGSL_MAGIC) {
 691                 printk(badmagic, name, routine);
 692                 return 1;
 693         }
 694 #else
 695         if (!info)
 696                 return 1;
 697 #endif
 698         return 0;
 699 }
 700
 701 /**
 702  * line discipline callback wrappers
 703  *
 704  * The wrappers maintain line discipline references
 705  * while calling into the line discipline.
 706  *
 707  * ldisc_receive_buf  - pass receive data to line discipline
 708  */
 709
 710 static void ldisc_receive_buf(struct tty_struct *tty,
 711                               const __u8 *data, char *flags, int count)
 712 {
 713         struct tty_ldisc *ld;
 714         if (!tty)
 715                 return;
 716         ld = tty_ldisc_ref(tty);
 717         if (ld) {
 718                 if (ld->receive_buf)
 719                         ld->receive_buf(tty, data, flags, count);
 720                 tty_ldisc_deref(ld);
 721         }
 722 }
 723
 724 /* tty callbacks */
 725
 726 /* Called when a port is opened.  Init and enable port.
 727  */
 728 static int open(struct tty_struct *tty, struct file *filp)
 729 {
 730         SLMP_INFO *info;
 731         int retval, line;
 732         unsigned long flags;
 733
 734         line = tty->index;
 735         if ((line < 0) || (line >= synclinkmp_device_count)) {
 736                 printk("%s(%d): open with invalid line #%d.\n",
 737                         __FILE__,__LINE__,line);
 738                 return -ENODEV;
 739         }
 740
 741         info = synclinkmp_device_list;
 742         while(info && info->line != line)
 743                 info = info->next_device;
 744         if (sanity_check(info, tty->name, "open"))
 745                 return -ENODEV;
 746         if ( info->init_error ) {
 747                 printk("%s(%d):%s device is not allocated, init error=%d\n",
 748                         __FILE__,__LINE__,info->device_name,info->init_error);
 749                 return -ENODEV;
 750         }
 751
 752         tty->driver_data = info;
 753         info->tty = tty;
 754
 755         if (debug_level >= DEBUG_LEVEL_INFO)
 756                 printk("%s(%d):%s open(), old ref count = %d\n",
 757                          __FILE__,__LINE__,tty->driver->name, info->count);
 758
 759         /* If port is closing, signal caller to try again */
 760         if (tty_hung_up_p(filp) || info->flags & ASYNC_CLOSING){
 761                 if (info->flags & ASYNC_CLOSING)
 762                         interruptible_sleep_on(&info->close_wait);
 763                 retval = ((info->flags & ASYNC_HUP_NOTIFY) ?
 764                         -EAGAIN : -ERESTARTSYS);
 765                 goto cleanup;
 766         }
 767
 768         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 769
 770         spin_lock_irqsave(&info->netlock, flags);
 771         if (info->netcount) {
 772                 retval = -EBUSY;
 773                 spin_unlock_irqrestore(&info->netlock, flags);
 774                 goto cleanup;
 775         }
 776         info->count++;
 777         spin_unlock_irqrestore(&info->netlock, flags);
 778
 779         if (info->count == 1) {
 780                 /* 1st open on this device, init hardware */
 781                 retval = startup(info);
 782                 if (retval < 0)
 783                         goto cleanup;
 784         }
 785
 786         retval = block_til_ready(tty, filp, info);
 787         if (retval) {
 788                 if (debug_level >= DEBUG_LEVEL_INFO)
 789                         printk("%s(%d):%s block_til_ready() returned %d\n",
 790                                  __FILE__,__LINE__, info->device_name, retval);
 791                 goto cleanup;
 792         }
 793
 794         if (debug_level >= DEBUG_LEVEL_INFO)
 795                 printk("%s(%d):%s open() success\n",
 796                          __FILE__,__LINE__, info->device_name);
 797         retval = 0;
 798
 799 cleanup:
 800         if (retval) {
 801                 if (tty->count == 1)
 802                         info->tty = NULL; /* tty layer will release tty struct */
 803                 if(info->count)
 804                         info->count--;
 805         }
 806
 807         return retval;
 808 }
 809
 810 /* Called when port is closed. Wait for remaining data to be
 811  * sent. Disable port and free resources.
 812  */
 813 static void close(struct tty_struct *tty, struct file *filp)
 814 {
 815         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
 816
 817         if (sanity_check(info, tty->name, "close"))
 818                 return;
 819
 820         if (debug_level >= DEBUG_LEVEL_INFO)
 821                 printk("%s(%d):%s close() entry, count=%d\n",
 822                          __FILE__,__LINE__, info->device_name, info->count);
 823
 824         if (!info->count)
 825                 return;
 826
 827         if (tty_hung_up_p(filp))
 828                 goto cleanup;
 829
 830         if ((tty->count == 1) && (info->count != 1)) {
 831                 /*
 832                  * tty->count is 1 and the tty structure will be freed.
 833                  * info->count should be one in this case.
 834                  * if it's not, correct it so that the port is shutdown.
 835                  */
 836                 printk("%s(%d):%s close: bad refcount; tty->count is 1, "
 837                        "info->count is %d\n",
 838                          __FILE__,__LINE__, info->device_name, info->count);
 839                 info->count = 1;
 840         }
 841
 842         info->count--;
 843
 844         /* if at least one open remaining, leave hardware active */
 845         if (info->count)
 846                 goto cleanup;
 847
 848         info->flags |= ASYNC_CLOSING;
 849
 850         /* set tty->closing to notify line discipline to
 851          * only process XON/XOFF characters. Only the N_TTY
 852          * discipline appears to use this (ppp does not).
 853          */
 854         tty->closing = 1;
 855
 856         /* wait for transmit data to clear all layers */
 857
 858         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
 859                 if (debug_level >= DEBUG_LEVEL_INFO)
 860                         printk("%s(%d):%s close() calling tty_wait_until_sent\n",
 861                                  __FILE__,__LINE__, info->device_name );
 862                 tty_wait_until_sent(tty, info->closing_wait);
 863         }
 864
 865         if (info->flags & ASYNC_INITIALIZED)
 866                 wait_until_sent(tty, info->timeout);
 867
 868         if (tty->driver->flush_buffer)
 869                 tty->driver->flush_buffer(tty);
 870
 871         tty_ldisc_flush(tty);
 872
 873         shutdown(info);
 874
 875         tty->closing = 0;
 876         info->tty = NULL;
 877
 878         if (info->blocked_open) {
 879                 if (info->close_delay) {
 880                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
 881                 }
 882                 wake_up_interruptible(&info->open_wait);
 883         }
 884
 885         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
 886
 887         wake_up_interruptible(&info->close_wait);
 888
 889 cleanup:
 890         if (debug_level >= DEBUG_LEVEL_INFO)
 891                 printk("%s(%d):%s close() exit, count=%d\n", __FILE__,__LINE__,
 892                         tty->driver->name, info->count);
 893 }
 894
 895 /* Called by tty_hangup() when a hangup is signaled.
 896  * This is the same as closing all open descriptors for the port.
 897  */
 898 static void hangup(struct tty_struct *tty)
 899 {
 900         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 901
 902         if (debug_level >= DEBUG_LEVEL_INFO)
 903                 printk("%s(%d):%s hangup()\n",
 904                          __FILE__,__LINE__, info->device_name );
 905
 906         if (sanity_check(info, tty->name, "hangup"))
 907                 return;
 908
 909         flush_buffer(tty);
 910         shutdown(info);
 911
 912         info->count = 0;
 913         info->flags &= ~ASYNC_NORMAL_ACTIVE;
 914         info->tty = NULL;
 915
 916         wake_up_interruptible(&info->open_wait);
 917 }
 918
 919 /* Set new termios settings
 920  */
 921 static void set_termios(struct tty_struct *tty, struct ktermios *old_termios)
 922 {
 923         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 924         unsigned long flags;
 925
 926         if (debug_level >= DEBUG_LEVEL_INFO)
 927                 printk("%s(%d):%s set_termios()\n", __FILE__,__LINE__,
 928                         tty->driver->name );
 929
 930         /* just return if nothing has changed */
 931         if ((tty->termios->c_cflag == old_termios->c_cflag)
 932             && (RELEVANT_IFLAG(tty->termios->c_iflag)
 933                 == RELEVANT_IFLAG(old_termios->c_iflag)))
 934           return;
 935
 936         change_params(info);
 937
 938         /* Handle transition to B0 status */
 939         if (old_termios->c_cflag & CBAUD &&
 940             !(tty->termios->c_cflag & CBAUD)) {
 941                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
 942                 spin_lock_irqsave(&info->lock,flags);
 943                 set_signals(info);
 944                 spin_unlock_irqrestore(&info->lock,flags);
 945         }
 946
 947         /* Handle transition away from B0 status */
 948         if (!(old_termios->c_cflag & CBAUD) &&
 949             tty->termios->c_cflag & CBAUD) {
 950                 info->serial_signals |= SerialSignal_DTR;
 951                 if (!(tty->termios->c_cflag & CRTSCTS) ||
 952                     !test_bit(TTY_THROTTLED, &tty->flags)) {
 953                         info->serial_signals |= SerialSignal_RTS;
 954                 }
 955                 spin_lock_irqsave(&info->lock,flags);
 956                 set_signals(info);
 957                 spin_unlock_irqrestore(&info->lock,flags);
 958         }
 959
 960         /* Handle turning off CRTSCTS */
 961         if (old_termios->c_cflag & CRTSCTS &&
 962             !(tty->termios->c_cflag & CRTSCTS)) {
 963                 tty->hw_stopped = 0;
 964                 tx_release(tty);
 965         }
 966 }
 967
 968 /* Send a block of data
 969  *
 970  * Arguments:
 971  *
 972  *      tty             pointer to tty information structure
 973  *      buf             pointer to buffer containing send data
 974  *      count           size of send data in bytes
 975  *
 976  * Return Value:        number of characters written
 977  */
 978 static int write(struct tty_struct *tty,
 979                  const unsigned char *buf, int count)
 980 {
 981         int     c, ret = 0;
 982         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
 983         unsigned long flags;
 984
 985         if (debug_level >= DEBUG_LEVEL_INFO)
 986                 printk("%s(%d):%s write() count=%d\n",
 987                        __FILE__,__LINE__,info->device_name,count);
 988
 989         if (sanity_check(info, tty->name, "write"))
 990                 goto cleanup;
 991
 992         if (!info->tx_buf)
 993                 goto cleanup;
 994
 995         if (info->params.mode == MGSL_MODE_HDLC) {
 996                 if (count > info->max_frame_size) {
 997                         ret = -EIO;
 998                         goto cleanup;
 999                 }
1000                 if (info->tx_active)
1001                         goto cleanup;
1002                 if (info->tx_count) {
1003                         /* send accumulated data from send_char() calls */
1004                         /* as frame and wait before accepting more data. */
1005                         tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1006                         goto start;
1007                 }
1008                 ret = info->tx_count = count;
1009                 tx_load_dma_buffer(info, buf, count);
1010                 goto start;
1011         }
1012
1013         for (;;) {
1014                 c = min_t(int, count,
1015                         min(info->max_frame_size - info->tx_count - 1,
1016                             info->max_frame_size - info->tx_put));
1017                 if (c <= 0)
1018                         break;
1019
1020                 memcpy(info->tx_buf + info->tx_put, buf, c);
1021
1022                 spin_lock_irqsave(&info->lock,flags);
1023                 info->tx_put += c;
1024                 if (info->tx_put >= info->max_frame_size)
1025                         info->tx_put -= info->max_frame_size;
1026                 info->tx_count += c;
1027                 spin_unlock_irqrestore(&info->lock,flags);
1028
1029                 buf += c;
1030                 count -= c;
1031                 ret += c;
1032         }
1033
1034         if (info->params.mode == MGSL_MODE_HDLC) {
1035                 if (count) {
1036                         ret = info->tx_count = 0;
1037                         goto cleanup;
1038                 }
1039                 tx_load_dma_buffer(info, info->tx_buf, info->tx_count);
1040         }
1041 start:
1042         if (info->tx_count && !tty->stopped && !tty->hw_stopped) {
1043                 spin_lock_irqsave(&info->lock,flags);
1044                 if (!info->tx_active)
1045                         tx_start(info);
1046                 spin_unlock_irqrestore(&info->lock,flags);
1047         }
1048
1049 cleanup:
1050         if (debug_level >= DEBUG_LEVEL_INFO)
1051                 printk( "%s(%d):%s write() returning=%d\n",
1052                         __FILE__,__LINE__,info->device_name,ret);
1053         return ret;
1054 }
1055
1056 /* Add a character to the transmit buffer.
1057  */
1058 static void put_char(struct tty_struct *tty, unsigned char ch)
1059 {
1060         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1061         unsigned long flags;
1062
1063         if ( debug_level >= DEBUG_LEVEL_INFO ) {
1064                 printk( "%s(%d):%s put_char(%d)\n",
1065                         __FILE__,__LINE__,info->device_name,ch);
1066         }
1067
1068         if (sanity_check(info, tty->name, "put_char"))
1069                 return;
1070
1071         if (!info->tx_buf)
1072                 return;
1073
1074         spin_lock_irqsave(&info->lock,flags);
1075
1076         if ( (info->params.mode != MGSL_MODE_HDLC) ||
1077              !info->tx_active ) {
1078
1079                 if (info->tx_count < info->max_frame_size - 1) {
1080                         info->tx_buf[info->tx_put++] = ch;
1081                         if (info->tx_put >= info->max_frame_size)
1082                                 info->tx_put -= info->max_frame_size;
1083                         info->tx_count++;
1084                 }
1085         }
1086
1087         spin_unlock_irqrestore(&info->lock,flags);
1088 }
1089
1090 /* Send a high-priority XON/XOFF character
1091  */
1092 static void send_xchar(struct tty_struct *tty, char ch)
1093 {
1094         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1095         unsigned long flags;
1096
1097         if (debug_level >= DEBUG_LEVEL_INFO)
1098                 printk("%s(%d):%s send_xchar(%d)\n",
1099                          __FILE__,__LINE__, info->device_name, ch );
1100
1101         if (sanity_check(info, tty->name, "send_xchar"))
1102                 return;
1103
1104         info->x_char = ch;
1105         if (ch) {
1106                 /* Make sure transmit interrupts are on */
1107                 spin_lock_irqsave(&info->lock,flags);
1108                 if (!info->tx_enabled)
1109                         tx_start(info);
1110                 spin_unlock_irqrestore(&info->lock,flags);
1111         }
1112 }
1113
1114 /* Wait until the transmitter is empty.
1115  */
1116 static void wait_until_sent(struct tty_struct *tty, int timeout)
1117 {
1118         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1119         unsigned long orig_jiffies, char_time;
1120
1121         if (!info )
1122                 return;
1123
1124         if (debug_level >= DEBUG_LEVEL_INFO)
1125                 printk("%s(%d):%s wait_until_sent() entry\n",
1126                          __FILE__,__LINE__, info->device_name );
1127
1128         if (sanity_check(info, tty->name, "wait_until_sent"))
1129                 return;
1130
1131         if (!(info->flags & ASYNC_INITIALIZED))
1132                 goto exit;
1133
1134         orig_jiffies = jiffies;
1135
1136         /* Set check interval to 1/5 of estimated time to
1137          * send a character, and make it at least 1. The check
1138          * interval should also be less than the timeout.
1139          * Note: use tight timings here to satisfy the NIST-PCTS.
1140          */
1141
1142         if ( info->params.data_rate ) {
1143                 char_time = info->timeout/(32 * 5);
1144                 if (!char_time)
1145                         char_time++;
1146         } else
1147                 char_time = 1;
1148
1149         if (timeout)
1150                 char_time = min_t(unsigned long, char_time, timeout);
1151
1152         if ( info->params.mode == MGSL_MODE_HDLC ) {
1153                 while (info->tx_active) {
1154                         msleep_interruptible(jiffies_to_msecs(char_time));
1155                         if (signal_pending(current))
1156                                 break;
1157                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1158                                 break;
1159                 }
1160         } else {
1161                 //TODO: determine if there is something similar to USC16C32
1162                 //      TXSTATUS_ALL_SENT status
1163                 while ( info->tx_active && info->tx_enabled) {
1164                         msleep_interruptible(jiffies_to_msecs(char_time));
1165                         if (signal_pending(current))
1166                                 break;
1167                         if (timeout && time_after(jiffies, orig_jiffies + timeout))
1168                                 break;
1169                 }
1170         }
1171
1172 exit:
1173         if (debug_level >= DEBUG_LEVEL_INFO)
1174                 printk("%s(%d):%s wait_until_sent() exit\n",
1175                          __FILE__,__LINE__, info->device_name );
1176 }
1177
1178 /* Return the count of free bytes in transmit buffer
1179  */
1180 static int write_room(struct tty_struct *tty)
1181 {
1182         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1183         int ret;
1184
1185         if (sanity_check(info, tty->name, "write_room"))
1186                 return 0;
1187
1188         if (info->params.mode == MGSL_MODE_HDLC) {
1189                 ret = (info->tx_active) ? 0 : HDLC_MAX_FRAME_SIZE;
1190         } else {
1191                 ret = info->max_frame_size - info->tx_count - 1;
1192                 if (ret < 0)
1193                         ret = 0;
1194         }
1195
1196         if (debug_level >= DEBUG_LEVEL_INFO)
1197                 printk("%s(%d):%s write_room()=%d\n",
1198                        __FILE__, __LINE__, info->device_name, ret);
1199
1200         return ret;
1201 }
1202
1203 /* enable transmitter and send remaining buffered characters
1204  */
1205 static void flush_chars(struct tty_struct *tty)
1206 {
1207         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1208         unsigned long flags;
1209
1210         if ( debug_level >= DEBUG_LEVEL_INFO )
1211                 printk( "%s(%d):%s flush_chars() entry tx_count=%d\n",
1212                         __FILE__,__LINE__,info->device_name,info->tx_count);
1213
1214         if (sanity_check(info, tty->name, "flush_chars"))
1215                 return;
1216
1217         if (info->tx_count <= 0 || tty->stopped || tty->hw_stopped ||
1218             !info->tx_buf)
1219                 return;
1220
1221         if ( debug_level >= DEBUG_LEVEL_INFO )
1222                 printk( "%s(%d):%s flush_chars() entry, starting transmitter\n",
1223                         __FILE__,__LINE__,info->device_name );
1224
1225         spin_lock_irqsave(&info->lock,flags);
1226
1227         if (!info->tx_active) {
1228                 if ( (info->params.mode == MGSL_MODE_HDLC) &&
1229                         info->tx_count ) {
1230                         /* operating in synchronous (frame oriented) mode */
1231                         /* copy data from circular tx_buf to */
1232                         /* transmit DMA buffer. */
1233                         tx_load_dma_buffer(info,
1234                                  info->tx_buf,info->tx_count);
1235                 }
1236                 tx_start(info);
1237         }
1238
1239         spin_unlock_irqrestore(&info->lock,flags);
1240 }
1241
1242 /* Discard all data in the send buffer
1243  */
1244 static void flush_buffer(struct tty_struct *tty)
1245 {
1246         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1247         unsigned long flags;
1248
1249         if (debug_level >= DEBUG_LEVEL_INFO)
1250                 printk("%s(%d):%s flush_buffer() entry\n",
1251                          __FILE__,__LINE__, info->device_name );
1252
1253         if (sanity_check(info, tty->name, "flush_buffer"))
1254                 return;
1255
1256         spin_lock_irqsave(&info->lock,flags);
1257         info->tx_count = info->tx_put = info->tx_get = 0;
1258         del_timer(&info->tx_timer);
1259         spin_unlock_irqrestore(&info->lock,flags);
1260
1261         tty_wakeup(tty);
1262 }
1263
1264 /* throttle (stop) transmitter
1265  */
1266 static void tx_hold(struct tty_struct *tty)
1267 {
1268         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1269         unsigned long flags;
1270
1271         if (sanity_check(info, tty->name, "tx_hold"))
1272                 return;
1273
1274         if ( debug_level >= DEBUG_LEVEL_INFO )
1275                 printk("%s(%d):%s tx_hold()\n",
1276                         __FILE__,__LINE__,info->device_name);
1277
1278         spin_lock_irqsave(&info->lock,flags);
1279         if (info->tx_enabled)
1280                 tx_stop(info);
1281         spin_unlock_irqrestore(&info->lock,flags);
1282 }
1283
1284 /* release (start) transmitter
1285  */
1286 static void tx_release(struct tty_struct *tty)
1287 {
1288         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1289         unsigned long flags;
1290
1291         if (sanity_check(info, tty->name, "tx_release"))
1292                 return;
1293
1294         if ( debug_level >= DEBUG_LEVEL_INFO )
1295                 printk("%s(%d):%s tx_release()\n",
1296                         __FILE__,__LINE__,info->device_name);
1297
1298         spin_lock_irqsave(&info->lock,flags);
1299         if (!info->tx_enabled)
1300                 tx_start(info);
1301         spin_unlock_irqrestore(&info->lock,flags);
1302 }
1303
1304 /* Service an IOCTL request
1305  *
1306  * Arguments:
1307  *
1308  *      tty     pointer to tty instance data
1309  *      file    pointer to associated file object for device
1310  *      cmd     IOCTL command code
1311  *      arg     command argument/context
1312  *
1313  * Return Value:        0 if success, otherwise error code
1314  */
1315 static int ioctl(struct tty_struct *tty, struct file *file,
1316                  unsigned int cmd, unsigned long arg)
1317 {
1318         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1319         int error;
1320         struct mgsl_icount cnow;        /* kernel counter temps */
1321         struct serial_icounter_struct __user *p_cuser;  /* user space */
1322         unsigned long flags;
1323         void __user *argp = (void __user *)arg;
1324
1325         if (debug_level >= DEBUG_LEVEL_INFO)
1326                 printk("%s(%d):%s ioctl() cmd=%08X\n", __FILE__,__LINE__,
1327                         info->device_name, cmd );
1328
1329         if (sanity_check(info, tty->name, "ioctl"))
1330                 return -ENODEV;
1331
1332         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1333             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1334                 if (tty->flags & (1 << TTY_IO_ERROR))
1335                     return -EIO;
1336         }
1337
1338         switch (cmd) {
1339         case MGSL_IOCGPARAMS:
1340                 return get_params(info, argp);
1341         case MGSL_IOCSPARAMS:
1342                 return set_params(info, argp);
1343         case MGSL_IOCGTXIDLE:
1344                 return get_txidle(info, argp);
1345         case MGSL_IOCSTXIDLE:
1346                 return set_txidle(info, (int)arg);
1347         case MGSL_IOCTXENABLE:
1348                 return tx_enable(info, (int)arg);
1349         case MGSL_IOCRXENABLE:
1350                 return rx_enable(info, (int)arg);
1351         case MGSL_IOCTXABORT:
1352                 return tx_abort(info);
1353         case MGSL_IOCGSTATS:
1354                 return get_stats(info, argp);
1355         case MGSL_IOCWAITEVENT:
1356                 return wait_mgsl_event(info, argp);
1357         case MGSL_IOCLOOPTXDONE:
1358                 return 0; // TODO: Not supported, need to document
1359                 /* Wait for modem input (DCD,RI,DSR,CTS) change
1360                  * as specified by mask in arg (TIOCM_RNG/DSR/CD/CTS)
1361                  */
1362         case TIOCMIWAIT:
1363                 return modem_input_wait(info,(int)arg);
1364
1365                 /*
1366                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1367                  * Return: write counters to the user passed counter struct
1368                  * NB: both 1->0 and 0->1 transitions are counted except for
1369                  *     RI where only 0->1 is counted.
1370                  */
1371         case TIOCGICOUNT:
1372                 spin_lock_irqsave(&info->lock,flags);
1373                 cnow = info->icount;
1374                 spin_unlock_irqrestore(&info->lock,flags);
1375                 p_cuser = argp;
1376                 PUT_USER(error,cnow.cts, &p_cuser->cts);
1377                 if (error) return error;
1378                 PUT_USER(error,cnow.dsr, &p_cuser->dsr);
1379                 if (error) return error;
1380                 PUT_USER(error,cnow.rng, &p_cuser->rng);
1381                 if (error) return error;
1382                 PUT_USER(error,cnow.dcd, &p_cuser->dcd);
1383                 if (error) return error;
1384                 PUT_USER(error,cnow.rx, &p_cuser->rx);
1385                 if (error) return error;
1386                 PUT_USER(error,cnow.tx, &p_cuser->tx);
1387                 if (error) return error;
1388                 PUT_USER(error,cnow.frame, &p_cuser->frame);
1389                 if (error) return error;
1390                 PUT_USER(error,cnow.overrun, &p_cuser->overrun);
1391                 if (error) return error;
1392                 PUT_USER(error,cnow.parity, &p_cuser->parity);
1393                 if (error) return error;
1394                 PUT_USER(error,cnow.brk, &p_cuser->brk);
1395                 if (error) return error;
1396                 PUT_USER(error,cnow.buf_overrun, &p_cuser->buf_overrun);
1397                 if (error) return error;
1398                 return 0;
1399         default:
1400                 return -ENOIOCTLCMD;
1401         }
1402         return 0;
1403 }
1404
1405 /*
1406  * /proc fs routines....
1407  */
1408
1409 static inline int line_info(char *buf, SLMP_INFO *info)
1410 {
1411         char    stat_buf[30];
1412         int     ret;
1413         unsigned long flags;
1414
1415         ret = sprintf(buf, "%s: SCABase=%08x Mem=%08X StatusControl=%08x LCR=%08X\n"
1416                        "\tIRQ=%d MaxFrameSize=%u\n",
1417                 info->device_name,
1418                 info->phys_sca_base,
1419                 info->phys_memory_base,
1420                 info->phys_statctrl_base,
1421                 info->phys_lcr_base,
1422                 info->irq_level,
1423                 info->max_frame_size );
1424
1425         /* output current serial signal states */
1426         spin_lock_irqsave(&info->lock,flags);
1427         get_signals(info);
1428         spin_unlock_irqrestore(&info->lock,flags);
1429
1430         stat_buf[0] = 0;
1431         stat_buf[1] = 0;
1432         if (info->serial_signals & SerialSignal_RTS)
1433                 strcat(stat_buf, "|RTS");
1434         if (info->serial_signals & SerialSignal_CTS)
1435                 strcat(stat_buf, "|CTS");
1436         if (info->serial_signals & SerialSignal_DTR)
1437                 strcat(stat_buf, "|DTR");
1438         if (info->serial_signals & SerialSignal_DSR)
1439                 strcat(stat_buf, "|DSR");
1440         if (info->serial_signals & SerialSignal_DCD)
1441                 strcat(stat_buf, "|CD");
1442         if (info->serial_signals & SerialSignal_RI)
1443                 strcat(stat_buf, "|RI");
1444
1445         if (info->params.mode == MGSL_MODE_HDLC) {
1446                 ret += sprintf(buf+ret, "\tHDLC txok:%d rxok:%d",
1447                               info->icount.txok, info->icount.rxok);
1448                 if (info->icount.txunder)
1449                         ret += sprintf(buf+ret, " txunder:%d", info->icount.txunder);
1450                 if (info->icount.txabort)
1451                         ret += sprintf(buf+ret, " txabort:%d", info->icount.txabort);
1452                 if (info->icount.rxshort)
1453                         ret += sprintf(buf+ret, " rxshort:%d", info->icount.rxshort);
1454                 if (info->icount.rxlong)
1455                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxlong);
1456                 if (info->icount.rxover)
1457                         ret += sprintf(buf+ret, " rxover:%d", info->icount.rxover);
1458                 if (info->icount.rxcrc)
1459                         ret += sprintf(buf+ret, " rxlong:%d", info->icount.rxcrc);
1460         } else {
1461                 ret += sprintf(buf+ret, "\tASYNC tx:%d rx:%d",
1462                               info->icount.tx, info->icount.rx);
1463                 if (info->icount.frame)
1464                         ret += sprintf(buf+ret, " fe:%d", info->icount.frame);
1465                 if (info->icount.parity)
1466                         ret += sprintf(buf+ret, " pe:%d", info->icount.parity);
1467                 if (info->icount.brk)
1468                         ret += sprintf(buf+ret, " brk:%d", info->icount.brk);
1469                 if (info->icount.overrun)
1470                         ret += sprintf(buf+ret, " oe:%d", info->icount.overrun);
1471         }
1472
1473         /* Append serial signal status to end */
1474         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1475
1476         ret += sprintf(buf+ret, "\ttxactive=%d bh_req=%d bh_run=%d pending_bh=%x\n",
1477          info->tx_active,info->bh_requested,info->bh_running,
1478          info->pending_bh);
1479
1480         return ret;
1481 }
1482
1483 /* Called to print information about devices
1484  */
1485 int read_proc(char *page, char **start, off_t off, int count,
1486               int *eof, void *data)
1487 {
1488         int len = 0, l;
1489         off_t   begin = 0;
1490         SLMP_INFO *info;
1491
1492         len += sprintf(page, "synclinkmp driver:%s\n", driver_version);
1493
1494         info = synclinkmp_device_list;
1495         while( info ) {
1496                 l = line_info(page + len, info);
1497                 len += l;
1498                 if (len+begin > off+count)
1499                         goto done;
1500                 if (len+begin < off) {
1501                         begin += len;
1502                         len = 0;
1503                 }
1504                 info = info->next_device;
1505         }
1506
1507         *eof = 1;
1508 done:
1509         if (off >= len+begin)
1510                 return 0;
1511         *start = page + (off-begin);
1512         return ((count < begin+len-off) ? count : begin+len-off);
1513 }
1514
1515 /* Return the count of bytes in transmit buffer
1516  */
1517 static int chars_in_buffer(struct tty_struct *tty)
1518 {
1519         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1520
1521         if (sanity_check(info, tty->name, "chars_in_buffer"))
1522                 return 0;
1523
1524         if (debug_level >= DEBUG_LEVEL_INFO)
1525                 printk("%s(%d):%s chars_in_buffer()=%d\n",
1526                        __FILE__, __LINE__, info->device_name, info->tx_count);
1527
1528         return info->tx_count;
1529 }
1530
1531 /* Signal remote device to throttle send data (our receive data)
1532  */
1533 static void throttle(struct tty_struct * tty)
1534 {
1535         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1536         unsigned long flags;
1537
1538         if (debug_level >= DEBUG_LEVEL_INFO)
1539                 printk("%s(%d):%s throttle() entry\n",
1540                          __FILE__,__LINE__, info->device_name );
1541
1542         if (sanity_check(info, tty->name, "throttle"))
1543                 return;
1544
1545         if (I_IXOFF(tty))
1546                 send_xchar(tty, STOP_CHAR(tty));
1547
1548         if (tty->termios->c_cflag & CRTSCTS) {
1549                 spin_lock_irqsave(&info->lock,flags);
1550                 info->serial_signals &= ~SerialSignal_RTS;
1551                 set_signals(info);
1552                 spin_unlock_irqrestore(&info->lock,flags);
1553         }
1554 }
1555
1556 /* Signal remote device to stop throttling send data (our receive data)
1557  */
1558 static void unthrottle(struct tty_struct * tty)
1559 {
1560         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
1561         unsigned long flags;
1562
1563         if (debug_level >= DEBUG_LEVEL_INFO)
1564                 printk("%s(%d):%s unthrottle() entry\n",
1565                          __FILE__,__LINE__, info->device_name );
1566
1567         if (sanity_check(info, tty->name, "unthrottle"))
1568                 return;
1569
1570         if (I_IXOFF(tty)) {
1571                 if (info->x_char)
1572                         info->x_char = 0;
1573                 else
1574                         send_xchar(tty, START_CHAR(tty));
1575         }
1576
1577         if (tty->termios->c_cflag & CRTSCTS) {
1578                 spin_lock_irqsave(&info->lock,flags);
1579                 info->serial_signals |= SerialSignal_RTS;
1580                 set_signals(info);
1581                 spin_unlock_irqrestore(&info->lock,flags);
1582         }
1583 }
1584
1585 /* set or clear transmit break condition
1586  * break_state  -1=set break condition, 0=clear
1587  */
1588 static void set_break(struct tty_struct *tty, int break_state)
1589 {
1590         unsigned char RegValue;
1591         SLMP_INFO * info = (SLMP_INFO *)tty->driver_data;
1592         unsigned long flags;
1593
1594         if (debug_level >= DEBUG_LEVEL_INFO)
1595                 printk("%s(%d):%s set_break(%d)\n",
1596                          __FILE__,__LINE__, info->device_name, break_state);
1597
1598         if (sanity_check(info, tty->name, "set_break"))
1599                 return;
1600
1601         spin_lock_irqsave(&info->lock,flags);
1602         RegValue = read_reg(info, CTL);
1603         if (break_state == -1)
1604                 RegValue |= BIT3;
1605         else
1606                 RegValue &= ~BIT3;
1607         write_reg(info, CTL, RegValue);
1608         spin_unlock_irqrestore(&info->lock,flags);
1609 }
1610
1611 #if SYNCLINK_GENERIC_HDLC
1612
1613 /**
1614  * called by generic HDLC layer when protocol selected (PPP, frame relay, etc.)
1615  * set encoding and frame check sequence (FCS) options
1616  *
1617  * dev       pointer to network device structure
1618  * encoding  serial encoding setting
1619  * parity    FCS setting
1620  *
1621  * returns 0 if success, otherwise error code
1622  */
1623 static int hdlcdev_attach(struct net_device *dev, unsigned short encoding,
1624                           unsigned short parity)
1625 {
1626         SLMP_INFO *info = dev_to_port(dev);
1627         unsigned char  new_encoding;
1628         unsigned short new_crctype;
1629
1630         /* return error if TTY interface open */
1631         if (info->count)
1632                 return -EBUSY;
1633
1634         switch (encoding)
1635         {
1636         case ENCODING_NRZ:        new_encoding = HDLC_ENCODING_NRZ; break;
1637         case ENCODING_NRZI:       new_encoding = HDLC_ENCODING_NRZI_SPACE; break;
1638         case ENCODING_FM_MARK:    new_encoding = HDLC_ENCODING_BIPHASE_MARK; break;
1639         case ENCODING_FM_SPACE:   new_encoding = HDLC_ENCODING_BIPHASE_SPACE; break;
1640         case ENCODING_MANCHESTER: new_encoding = HDLC_ENCODING_BIPHASE_LEVEL; break;
1641         default: return -EINVAL;
1642         }
1643
1644         switch (parity)
1645         {
1646         case PARITY_NONE:            new_crctype = HDLC_CRC_NONE; break;
1647         case PARITY_CRC16_PR1_CCITT: new_crctype = HDLC_CRC_16_CCITT; break;
1648         case PARITY_CRC32_PR1_CCITT: new_crctype = HDLC_CRC_32_CCITT; break;
1649         default: return -EINVAL;
1650         }
1651
1652         info->params.encoding = new_encoding;
1653         info->params.crc_type = new_crctype;
1654
1655         /* if network interface up, reprogram hardware */
1656         if (info->netcount)
1657                 program_hw(info);
1658
1659         return 0;
1660 }
1661
1662 /**
1663  * called by generic HDLC layer to send frame
1664  *
1665  * skb  socket buffer containing HDLC frame
1666  * dev  pointer to network device structure
1667  *
1668  * returns 0 if success, otherwise error code
1669  */
1670 static int hdlcdev_xmit(struct sk_buff *skb, struct net_device *dev)
1671 {
1672         SLMP_INFO *info = dev_to_port(dev);
1673         struct net_device_stats *stats = hdlc_stats(dev);
1674         unsigned long flags;
1675
1676         if (debug_level >= DEBUG_LEVEL_INFO)
1677                 printk(KERN_INFO "%s:hdlc_xmit(%s)\n",__FILE__,dev->name);
1678
1679         /* stop sending until this frame completes */
1680         netif_stop_queue(dev);
1681
1682         /* copy data to device buffers */
1683         info->tx_count = skb->len;
1684         tx_load_dma_buffer(info, skb->data, skb->len);
1685
1686         /* update network statistics */
1687         stats->tx_packets++;
1688         stats->tx_bytes += skb->len;
1689
1690         /* done with socket buffer, so free it */
1691         dev_kfree_skb(skb);
1692
1693         /* save start time for transmit timeout detection */
1694         dev->trans_start = jiffies;
1695
1696         /* start hardware transmitter if necessary */
1697         spin_lock_irqsave(&info->lock,flags);
1698         if (!info->tx_active)
1699                 tx_start(info);
1700         spin_unlock_irqrestore(&info->lock,flags);
1701
1702         return 0;
1703 }
1704
1705 /**
1706  * called by network layer when interface enabled
1707  * claim resources and initialize hardware
1708  *
1709  * dev  pointer to network device structure
1710  *
1711  * returns 0 if success, otherwise error code
1712  */
1713 static int hdlcdev_open(struct net_device *dev)
1714 {
1715         SLMP_INFO *info = dev_to_port(dev);
1716         int rc;
1717         unsigned long flags;
1718
1719         if (debug_level >= DEBUG_LEVEL_INFO)
1720                 printk("%s:hdlcdev_open(%s)\n",__FILE__,dev->name);
1721
1722         /* generic HDLC layer open processing */
1723         if ((rc = hdlc_open(dev)))
1724                 return rc;
1725
1726         /* arbitrate between network and tty opens */
1727         spin_lock_irqsave(&info->netlock, flags);
1728         if (info->count != 0 || info->netcount != 0) {
1729                 printk(KERN_WARNING "%s: hdlc_open returning busy\n", dev->name);
1730                 spin_unlock_irqrestore(&info->netlock, flags);
1731                 return -EBUSY;
1732         }
1733         info->netcount=1;
1734         spin_unlock_irqrestore(&info->netlock, flags);
1735
1736         /* claim resources and init adapter */
1737         if ((rc = startup(info)) != 0) {
1738                 spin_lock_irqsave(&info->netlock, flags);
1739                 info->netcount=0;
1740                 spin_unlock_irqrestore(&info->netlock, flags);
1741                 return rc;
1742         }
1743
1744         /* assert DTR and RTS, apply hardware settings */
1745         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
1746         program_hw(info);
1747
1748         /* enable network layer transmit */
1749         dev->trans_start = jiffies;
1750         netif_start_queue(dev);
1751
1752         /* inform generic HDLC layer of current DCD status */
1753         spin_lock_irqsave(&info->lock, flags);
1754         get_signals(info);
1755         spin_unlock_irqrestore(&info->lock, flags);
1756         if (info->serial_signals & SerialSignal_DCD)
1757                 netif_carrier_on(dev);
1758         else
1759                 netif_carrier_off(dev);
1760         return 0;
1761 }
1762
1763 /**
1764  * called by network layer when interface is disabled
1765  * shutdown hardware and release resources
1766  *
1767  * dev  pointer to network device structure
1768  *
1769  * returns 0 if success, otherwise error code
1770  */
1771 static int hdlcdev_close(struct net_device *dev)
1772 {
1773         SLMP_INFO *info = dev_to_port(dev);
1774         unsigned long flags;
1775
1776         if (debug_level >= DEBUG_LEVEL_INFO)
1777                 printk("%s:hdlcdev_close(%s)\n",__FILE__,dev->name);
1778
1779         netif_stop_queue(dev);
1780
1781         /* shutdown adapter and release resources */
1782         shutdown(info);
1783
1784         hdlc_close(dev);
1785
1786         spin_lock_irqsave(&info->netlock, flags);
1787         info->netcount=0;
1788         spin_unlock_irqrestore(&info->netlock, flags);
1789
1790         return 0;
1791 }
1792
1793 /**
1794  * called by network layer to process IOCTL call to network device
1795  *
1796  * dev  pointer to network device structure
1797  * ifr  pointer to network interface request structure
1798  * cmd  IOCTL command code
1799  *
1800  * returns 0 if success, otherwise error code
1801  */
1802 static int hdlcdev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1803 {
1804         const size_t size = sizeof(sync_serial_settings);
1805         sync_serial_settings new_line;
1806         sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1807         SLMP_INFO *info = dev_to_port(dev);
1808         unsigned int flags;
1809
1810         if (debug_level >= DEBUG_LEVEL_INFO)
1811                 printk("%s:hdlcdev_ioctl(%s)\n",__FILE__,dev->name);
1812
1813         /* return error if TTY interface open */
1814         if (info->count)
1815                 return -EBUSY;
1816
1817         if (cmd != SIOCWANDEV)
1818                 return hdlc_ioctl(dev, ifr, cmd);
1819
1820         switch(ifr->ifr_settings.type) {
1821         case IF_GET_IFACE: /* return current sync_serial_settings */
1822
1823                 ifr->ifr_settings.type = IF_IFACE_SYNC_SERIAL;
1824                 if (ifr->ifr_settings.size < size) {
1825                         ifr->ifr_settings.size = size; /* data size wanted */
1826                         return -ENOBUFS;
1827                 }
1828
1829                 flags = info->params.flags & (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1830                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1831                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1832                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1833
1834                 switch (flags){
1835                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN): new_line.clock_type = CLOCK_EXT; break;
1836                 case (HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_INT; break;
1837                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG):    new_line.clock_type = CLOCK_TXINT; break;
1838                 case (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN): new_line.clock_type = CLOCK_TXFROMRX; break;
1839                 default: new_line.clock_type = CLOCK_DEFAULT;
1840                 }
1841
1842                 new_line.clock_rate = info->params.clock_speed;
1843                 new_line.loopback   = info->params.loopback ? 1:0;
1844
1845                 if (copy_to_user(line, &new_line, size))
1846                         return -EFAULT;
1847                 return 0;
1848
1849         case IF_IFACE_SYNC_SERIAL: /* set sync_serial_settings */
1850
1851                 if(!capable(CAP_NET_ADMIN))
1852                         return -EPERM;
1853                 if (copy_from_user(&new_line, line, size))
1854                         return -EFAULT;
1855
1856                 switch (new_line.clock_type)
1857                 {
1858                 case CLOCK_EXT:      flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_TXCPIN; break;
1859                 case CLOCK_TXFROMRX: flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_RXCPIN; break;
1860                 case CLOCK_INT:      flags = HDLC_FLAG_RXC_BRG    | HDLC_FLAG_TXC_BRG;    break;
1861                 case CLOCK_TXINT:    flags = HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_TXC_BRG;    break;
1862                 case CLOCK_DEFAULT:  flags = info->params.flags &
1863                                              (HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1864                                               HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1865                                               HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1866                                               HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN); break;
1867                 default: return -EINVAL;
1868                 }
1869
1870                 if (new_line.loopback != 0 && new_line.loopback != 1)
1871                         return -EINVAL;
1872
1873                 info->params.flags &= ~(HDLC_FLAG_RXC_RXCPIN | HDLC_FLAG_RXC_DPLL |
1874                                         HDLC_FLAG_RXC_BRG    | HDLC_FLAG_RXC_TXCPIN |
1875                                         HDLC_FLAG_TXC_TXCPIN | HDLC_FLAG_TXC_DPLL |
1876                                         HDLC_FLAG_TXC_BRG    | HDLC_FLAG_TXC_RXCPIN);
1877                 info->params.flags |= flags;
1878
1879                 info->params.loopback = new_line.loopback;
1880
1881                 if (flags & (HDLC_FLAG_RXC_BRG | HDLC_FLAG_TXC_BRG))
1882                         info->params.clock_speed = new_line.clock_rate;
1883                 else
1884                         info->params.clock_speed = 0;
1885
1886                 /* if network interface up, reprogram hardware */
1887                 if (info->netcount)
1888                         program_hw(info);
1889                 return 0;
1890
1891         default:
1892                 return hdlc_ioctl(dev, ifr, cmd);
1893         }
1894 }
1895
1896 /**
1897  * called by network layer when transmit timeout is detected
1898  *
1899  * dev  pointer to network device structure
1900  */
1901 static void hdlcdev_tx_timeout(struct net_device *dev)
1902 {
1903         SLMP_INFO *info = dev_to_port(dev);
1904         struct net_device_stats *stats = hdlc_stats(dev);
1905         unsigned long flags;
1906
1907         if (debug_level >= DEBUG_LEVEL_INFO)
1908                 printk("hdlcdev_tx_timeout(%s)\n",dev->name);
1909
1910         stats->tx_errors++;
1911         stats->tx_aborted_errors++;
1912
1913         spin_lock_irqsave(&info->lock,flags);
1914         tx_stop(info);
1915         spin_unlock_irqrestore(&info->lock,flags);
1916
1917         netif_wake_queue(dev);
1918 }
1919
1920 /**
1921  * called by device driver when transmit completes
1922  * reenable network layer transmit if stopped
1923  *
1924  * info  pointer to device instance information
1925  */
1926 static void hdlcdev_tx_done(SLMP_INFO *info)
1927 {
1928         if (netif_queue_stopped(info->netdev))
1929                 netif_wake_queue(info->netdev);
1930 }
1931
1932 /**
1933  * called by device driver when frame received
1934  * pass frame to network layer
1935  *
1936  * info  pointer to device instance information
1937  * buf   pointer to buffer contianing frame data
1938  * size  count of data bytes in buf
1939  */
1940 static void hdlcdev_rx(SLMP_INFO *info, char *buf, int size)
1941 {
1942         struct sk_buff *skb = dev_alloc_skb(size);
1943         struct net_device *dev = info->netdev;
1944         struct net_device_stats *stats = hdlc_stats(dev);
1945
1946         if (debug_level >= DEBUG_LEVEL_INFO)
1947                 printk("hdlcdev_rx(%s)\n",dev->name);
1948
1949         if (skb == NULL) {
1950                 printk(KERN_NOTICE "%s: can't alloc skb, dropping packet\n", dev->name);
1951                 stats->rx_dropped++;
1952                 return;
1953         }
1954
1955         memcpy(skb_put(skb, size),buf,size);
1956
1957         skb->protocol = hdlc_type_trans(skb, info->netdev);
1958
1959         stats->rx_packets++;
1960         stats->rx_bytes += size;
1961
1962         netif_rx(skb);
1963
1964         info->netdev->last_rx = jiffies;
1965 }
1966
1967 /**
1968  * called by device driver when adding device instance
1969  * do generic HDLC initialization
1970  *
1971  * info  pointer to device instance information
1972  *
1973  * returns 0 if success, otherwise error code
1974  */
1975 static int hdlcdev_init(SLMP_INFO *info)
1976 {
1977         int rc;
1978         struct net_device *dev;
1979         hdlc_device *hdlc;
1980
1981         /* allocate and initialize network and HDLC layer objects */
1982
1983         if (!(dev = alloc_hdlcdev(info))) {
1984                 printk(KERN_ERR "%s:hdlc device allocation failure\n",__FILE__);
1985                 return -ENOMEM;
1986         }
1987
1988         /* for network layer reporting purposes only */
1989         dev->mem_start = info->phys_sca_base;
1990         dev->mem_end   = info->phys_sca_base + SCA_BASE_SIZE - 1;
1991         dev->irq       = info->irq_level;
1992
1993         /* network layer callbacks and settings */
1994         dev->do_ioctl       = hdlcdev_ioctl;
1995         dev->open           = hdlcdev_open;
1996         dev->stop           = hdlcdev_close;
1997         dev->tx_timeout     = hdlcdev_tx_timeout;
1998         dev->watchdog_timeo = 10*HZ;
1999         dev->tx_queue_len   = 50;
2000
2001         /* generic HDLC layer callbacks and settings */
2002         hdlc         = dev_to_hdlc(dev);
2003         hdlc->attach = hdlcdev_attach;
2004         hdlc->xmit   = hdlcdev_xmit;
2005
2006         /* register objects with HDLC layer */
2007         if ((rc = register_hdlc_device(dev))) {
2008                 printk(KERN_WARNING "%s:unable to register hdlc device\n",__FILE__);
2009                 free_netdev(dev);
2010                 return rc;
2011         }
2012
2013         info->netdev = dev;
2014         return 0;
2015 }
2016
2017 /**
2018  * called by device driver when removing device instance
2019  * do generic HDLC cleanup
2020  *
2021  * info  pointer to device instance information
2022  */
2023 static void hdlcdev_exit(SLMP_INFO *info)
2024 {
2025         unregister_hdlc_device(info->netdev);
2026         free_netdev(info->netdev);
2027         info->netdev = NULL;
2028 }
2029
2030 #endif /* CONFIG_HDLC */
2031
2032
2033 /* Return next bottom half action to perform.
2034  * Return Value:        BH action code or 0 if nothing to do.
2035  */
2036 int bh_action(SLMP_INFO *info)
2037 {
2038         unsigned long flags;
2039         int rc = 0;
2040
2041         spin_lock_irqsave(&info->lock,flags);
2042
2043         if (info->pending_bh & BH_RECEIVE) {
2044                 info->pending_bh &= ~BH_RECEIVE;
2045                 rc = BH_RECEIVE;
2046         } else if (info->pending_bh & BH_TRANSMIT) {
2047                 info->pending_bh &= ~BH_TRANSMIT;
2048                 rc = BH_TRANSMIT;
2049         } else if (info->pending_bh & BH_STATUS) {
2050                 info->pending_bh &= ~BH_STATUS;
2051                 rc = BH_STATUS;
2052         }
2053
2054         if (!rc) {
2055                 /* Mark BH routine as complete */
2056                 info->bh_running   = 0;
2057                 info->bh_requested = 0;
2058         }
2059
2060         spin_unlock_irqrestore(&info->lock,flags);
2061
2062         return rc;
2063 }
2064
2065 /* Perform bottom half processing of work items queued by ISR.
2066  */
2067 void bh_handler(struct work_struct *work)
2068 {
2069         SLMP_INFO *info = container_of(work, SLMP_INFO, task);
2070         int action;
2071
2072         if (!info)
2073                 return;
2074
2075         if ( debug_level >= DEBUG_LEVEL_BH )
2076                 printk( "%s(%d):%s bh_handler() entry\n",
2077                         __FILE__,__LINE__,info->device_name);
2078
2079         info->bh_running = 1;
2080
2081         while((action = bh_action(info)) != 0) {
2082
2083                 /* Process work item */
2084                 if ( debug_level >= DEBUG_LEVEL_BH )
2085                         printk( "%s(%d):%s bh_handler() work item action=%d\n",
2086                                 __FILE__,__LINE__,info->device_name, action);
2087
2088                 switch (action) {
2089
2090                 case BH_RECEIVE:
2091                         bh_receive(info);
2092                         break;
2093                 case BH_TRANSMIT:
2094                         bh_transmit(info);
2095                         break;
2096                 case BH_STATUS:
2097                         bh_status(info);
2098                         break;
2099                 default:
2100                         /* unknown work item ID */
2101                         printk("%s(%d):%s Unknown work item ID=%08X!\n",
2102                                 __FILE__,__LINE__,info->device_name,action);
2103                         break;
2104                 }
2105         }
2106
2107         if ( debug_level >= DEBUG_LEVEL_BH )
2108                 printk( "%s(%d):%s bh_handler() exit\n",
2109                         __FILE__,__LINE__,info->device_name);
2110 }
2111
2112 void bh_receive(SLMP_INFO *info)
2113 {
2114         if ( debug_level >= DEBUG_LEVEL_BH )
2115                 printk( "%s(%d):%s bh_receive()\n",
2116                         __FILE__,__LINE__,info->device_name);
2117
2118         while( rx_get_frame(info) );
2119 }
2120
2121 void bh_transmit(SLMP_INFO *info)
2122 {
2123         struct tty_struct *tty = info->tty;
2124
2125         if ( debug_level >= DEBUG_LEVEL_BH )
2126                 printk( "%s(%d):%s bh_transmit() entry\n",
2127                         __FILE__,__LINE__,info->device_name);
2128
2129         if (tty)
2130                 tty_wakeup(tty);
2131 }
2132
2133 void bh_status(SLMP_INFO *info)
2134 {
2135         if ( debug_level >= DEBUG_LEVEL_BH )
2136                 printk( "%s(%d):%s bh_status() entry\n",
2137                         __FILE__,__LINE__,info->device_name);
2138
2139         info->ri_chkcount = 0;
2140         info->dsr_chkcount = 0;
2141         info->dcd_chkcount = 0;
2142         info->cts_chkcount = 0;
2143 }
2144
2145 void isr_timer(SLMP_INFO * info)
2146 {
2147         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
2148
2149         /* IER2<7..4> = timer<3..0> interrupt enables (0=disabled) */
2150         write_reg(info, IER2, 0);
2151
2152         /* TMCS, Timer Control/Status Register
2153          *
2154          * 07      CMF, Compare match flag (read only) 1=match
2155          * 06      ECMI, CMF Interrupt Enable: 0=disabled
2156          * 05      Reserved, must be 0
2157          * 04      TME, Timer Enable
2158          * 03..00  Reserved, must be 0
2159          *
2160          * 0000 0000
2161          */
2162         write_reg(info, (unsigned char)(timer + TMCS), 0);
2163
2164         info->irq_occurred = TRUE;
2165
2166         if ( debug_level >= DEBUG_LEVEL_ISR )
2167                 printk("%s(%d):%s isr_timer()\n",
2168                         __FILE__,__LINE__,info->device_name);
2169 }
2170
2171 void isr_rxint(SLMP_INFO * info)
2172 {
2173         struct tty_struct *tty = info->tty;
2174         struct  mgsl_icount *icount = &info->icount;
2175         unsigned char status = read_reg(info, SR1) & info->ie1_value & (FLGD + IDLD + CDCD + BRKD);
2176         unsigned char status2 = read_reg(info, SR2) & info->ie2_value & OVRN;
2177
2178         /* clear status bits */
2179         if (status)
2180                 write_reg(info, SR1, status);
2181
2182         if (status2)
2183                 write_reg(info, SR2, status2);
2184
2185         if ( debug_level >= DEBUG_LEVEL_ISR )
2186                 printk("%s(%d):%s isr_rxint status=%02X %02x\n",
2187                         __FILE__,__LINE__,info->device_name,status,status2);
2188
2189         if (info->params.mode == MGSL_MODE_ASYNC) {
2190                 if (status & BRKD) {
2191                         icount->brk++;
2192
2193                         /* process break detection if tty control
2194                          * is not set to ignore it
2195                          */
2196                         if ( tty ) {
2197                                 if (!(status & info->ignore_status_mask1)) {
2198                                         if (info->read_status_mask1 & BRKD) {
2199                                                 tty_insert_flip_char(tty, 0, TTY_BREAK);
2200                                                 if (info->flags & ASYNC_SAK)
2201                                                         do_SAK(tty);
2202                                         }
2203                                 }
2204                         }
2205                 }
2206         }
2207         else {
2208                 if (status & (FLGD|IDLD)) {
2209                         if (status & FLGD)
2210                                 info->icount.exithunt++;
2211                         else if (status & IDLD)
2212                                 info->icount.rxidle++;
2213                         wake_up_interruptible(&info->event_wait_q);
2214                 }
2215         }
2216
2217         if (status & CDCD) {
2218                 /* simulate a common modem status change interrupt
2219                  * for our handler
2220                  */
2221                 get_signals( info );
2222                 isr_io_pin(info,
2223                         MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD));
2224         }
2225 }
2226
2227 /*
2228  * handle async rx data interrupts
2229  */
2230 void isr_rxrdy(SLMP_INFO * info)
2231 {
2232         u16 status;
2233         unsigned char DataByte;
2234         struct tty_struct *tty = info->tty;
2235         struct  mgsl_icount *icount = &info->icount;
2236
2237         if ( debug_level >= DEBUG_LEVEL_ISR )
2238                 printk("%s(%d):%s isr_rxrdy\n",
2239                         __FILE__,__LINE__,info->device_name);
2240
2241         while((status = read_reg(info,CST0)) & BIT0)
2242         {
2243                 int flag = 0;
2244                 int over = 0;
2245                 DataByte = read_reg(info,TRB);
2246
2247                 icount->rx++;
2248
2249                 if ( status & (PE + FRME + OVRN) ) {
2250                         printk("%s(%d):%s rxerr=%04X\n",
2251                                 __FILE__,__LINE__,info->device_name,status);
2252
2253                         /* update error statistics */
2254                         if (status & PE)
2255                                 icount->parity++;
2256                         else if (status & FRME)
2257                                 icount->frame++;
2258                         else if (status & OVRN)
2259                                 icount->overrun++;
2260
2261                         /* discard char if tty control flags say so */
2262                         if (status & info->ignore_status_mask2)
2263                                 continue;
2264
2265                         status &= info->read_status_mask2;
2266
2267                         if ( tty ) {
2268                                 if (status & PE)
2269                                         flag = TTY_PARITY;
2270                                 else if (status & FRME)
2271                                         flag = TTY_FRAME;
2272                                 if (status & OVRN) {
2273                                         /* Overrun is special, since it's
2274                                          * reported immediately, and doesn't
2275                                          * affect the current character
2276                                          */
2277                                         over = 1;
2278                                 }
2279                         }
2280                 }       /* end of if (error) */
2281
2282                 if ( tty ) {
2283                         tty_insert_flip_char(tty, DataByte, flag);
2284                         if (over)
2285                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
2286                 }
2287         }
2288
2289         if ( debug_level >= DEBUG_LEVEL_ISR ) {
2290                 printk("%s(%d):%s rx=%d brk=%d parity=%d frame=%d overrun=%d\n",
2291                         __FILE__,__LINE__,info->device_name,
2292                         icount->rx,icount->brk,icount->parity,
2293                         icount->frame,icount->overrun);
2294         }
2295
2296         if ( tty )
2297                 tty_flip_buffer_push(tty);
2298 }
2299
2300 static void isr_txeom(SLMP_INFO * info, unsigned char status)
2301 {
2302         if ( debug_level >= DEBUG_LEVEL_ISR )
2303                 printk("%s(%d):%s isr_txeom status=%02x\n",
2304                         __FILE__,__LINE__,info->device_name,status);
2305
2306         write_reg(info, TXDMA + DIR, 0x00); /* disable Tx DMA IRQs */
2307         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2308         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2309
2310         if (status & UDRN) {
2311                 write_reg(info, CMD, TXRESET);
2312                 write_reg(info, CMD, TXENABLE);
2313         } else
2314                 write_reg(info, CMD, TXBUFCLR);
2315
2316         /* disable and clear tx interrupts */
2317         info->ie0_value &= ~TXRDYE;
2318         info->ie1_value &= ~(IDLE + UDRN);
2319         write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2320         write_reg(info, SR1, (unsigned char)(UDRN + IDLE));
2321
2322         if ( info->tx_active ) {
2323                 if (info->params.mode != MGSL_MODE_ASYNC) {
2324                         if (status & UDRN)
2325                                 info->icount.txunder++;
2326                         else if (status & IDLE)
2327                                 info->icount.txok++;
2328                 }
2329
2330                 info->tx_active = 0;
2331                 info->tx_count = info->tx_put = info->tx_get = 0;
2332
2333                 del_timer(&info->tx_timer);
2334
2335                 if (info->params.mode != MGSL_MODE_ASYNC && info->drop_rts_on_tx_done ) {
2336                         info->serial_signals &= ~SerialSignal_RTS;
2337                         info->drop_rts_on_tx_done = 0;
2338                         set_signals(info);
2339                 }
2340
2341 #if SYNCLINK_GENERIC_HDLC
2342                 if (info->netcount)
2343                         hdlcdev_tx_done(info);
2344                 else
2345 #endif
2346                 {
2347                         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2348                                 tx_stop(info);
2349                                 return;
2350                         }
2351                         info->pending_bh |= BH_TRANSMIT;
2352                 }
2353         }
2354 }
2355
2356
2357 /*
2358  * handle tx status interrupts
2359  */
2360 void isr_txint(SLMP_INFO * info)
2361 {
2362         unsigned char status = read_reg(info, SR1) & info->ie1_value & (UDRN + IDLE + CCTS);
2363
2364         /* clear status bits */
2365         write_reg(info, SR1, status);
2366
2367         if ( debug_level >= DEBUG_LEVEL_ISR )
2368                 printk("%s(%d):%s isr_txint status=%02x\n",
2369                         __FILE__,__LINE__,info->device_name,status);
2370
2371         if (status & (UDRN + IDLE))
2372                 isr_txeom(info, status);
2373
2374         if (status & CCTS) {
2375                 /* simulate a common modem status change interrupt
2376                  * for our handler
2377                  */
2378                 get_signals( info );
2379                 isr_io_pin(info,
2380                         MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS));
2381
2382         }
2383 }
2384
2385 /*
2386  * handle async tx data interrupts
2387  */
2388 void isr_txrdy(SLMP_INFO * info)
2389 {
2390         if ( debug_level >= DEBUG_LEVEL_ISR )
2391                 printk("%s(%d):%s isr_txrdy() tx_count=%d\n",
2392                         __FILE__,__LINE__,info->device_name,info->tx_count);
2393
2394         if (info->params.mode != MGSL_MODE_ASYNC) {
2395                 /* disable TXRDY IRQ, enable IDLE IRQ */
2396                 info->ie0_value &= ~TXRDYE;
2397                 info->ie1_value |= IDLE;
2398                 write_reg16(info, IE0, (unsigned short)((info->ie1_value << 8) + info->ie0_value));
2399                 return;
2400         }
2401
2402         if (info->tty && (info->tty->stopped || info->tty->hw_stopped)) {
2403                 tx_stop(info);
2404                 return;
2405         }
2406
2407         if ( info->tx_count )
2408                 tx_load_fifo( info );
2409         else {
2410                 info->tx_active = 0;
2411                 info->ie0_value &= ~TXRDYE;
2412                 write_reg(info, IE0, info->ie0_value);
2413         }
2414
2415         if (info->tx_count < WAKEUP_CHARS)
2416                 info->pending_bh |= BH_TRANSMIT;
2417 }
2418
2419 void isr_rxdmaok(SLMP_INFO * info)
2420 {
2421         /* BIT7 = EOT (end of transfer)
2422          * BIT6 = EOM (end of message/frame)
2423          */
2424         unsigned char status = read_reg(info,RXDMA + DSR) & 0xc0;
2425
2426         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2427         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2428
2429         if ( debug_level >= DEBUG_LEVEL_ISR )
2430                 printk("%s(%d):%s isr_rxdmaok(), status=%02x\n",
2431                         __FILE__,__LINE__,info->device_name,status);
2432
2433         info->pending_bh |= BH_RECEIVE;
2434 }
2435
2436 void isr_rxdmaerror(SLMP_INFO * info)
2437 {
2438         /* BIT5 = BOF (buffer overflow)
2439          * BIT4 = COF (counter overflow)
2440          */
2441         unsigned char status = read_reg(info,RXDMA + DSR) & 0x30;
2442
2443         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2444         write_reg(info, RXDMA + DSR, (unsigned char)(status | 1));
2445
2446         if ( debug_level >= DEBUG_LEVEL_ISR )
2447                 printk("%s(%d):%s isr_rxdmaerror(), status=%02x\n",
2448                         __FILE__,__LINE__,info->device_name,status);
2449
2450         info->rx_overflow = TRUE;
2451         info->pending_bh |= BH_RECEIVE;
2452 }
2453
2454 void isr_txdmaok(SLMP_INFO * info)
2455 {
2456         unsigned char status_reg1 = read_reg(info, SR1);
2457
2458         write_reg(info, TXDMA + DIR, 0x00);     /* disable Tx DMA IRQs */
2459         write_reg(info, TXDMA + DSR, 0xc0); /* clear IRQs and disable DMA */
2460         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
2461
2462         if ( debug_level >= DEBUG_LEVEL_ISR )
2463                 printk("%s(%d):%s isr_txdmaok(), status=%02x\n",
2464                         __FILE__,__LINE__,info->device_name,status_reg1);
2465
2466         /* program TXRDY as FIFO empty flag, enable TXRDY IRQ */
2467         write_reg16(info, TRC0, 0);
2468         info->ie0_value |= TXRDYE;
2469         write_reg(info, IE0, info->ie0_value);
2470 }
2471
2472 void isr_txdmaerror(SLMP_INFO * info)
2473 {
2474         /* BIT5 = BOF (buffer overflow)
2475          * BIT4 = COF (counter overflow)
2476          */
2477         unsigned char status = read_reg(info,TXDMA + DSR) & 0x30;
2478
2479         /* clear IRQ (BIT0 must be 1 to prevent clearing DE bit) */
2480         write_reg(info, TXDMA + DSR, (unsigned char)(status | 1));
2481
2482         if ( debug_level >= DEBUG_LEVEL_ISR )
2483                 printk("%s(%d):%s isr_txdmaerror(), status=%02x\n",
2484                         __FILE__,__LINE__,info->device_name,status);
2485 }
2486
2487 /* handle input serial signal changes
2488  */
2489 void isr_io_pin( SLMP_INFO *info, u16 status )
2490 {
2491         struct  mgsl_icount *icount;
2492
2493         if ( debug_level >= DEBUG_LEVEL_ISR )
2494                 printk("%s(%d):isr_io_pin status=%04X\n",
2495                         __FILE__,__LINE__,status);
2496
2497         if (status & (MISCSTATUS_CTS_LATCHED | MISCSTATUS_DCD_LATCHED |
2498                       MISCSTATUS_DSR_LATCHED | MISCSTATUS_RI_LATCHED) ) {
2499                 icount = &info->icount;
2500                 /* update input line counters */
2501                 if (status & MISCSTATUS_RI_LATCHED) {
2502                         icount->rng++;
2503                         if ( status & SerialSignal_RI )
2504                                 info->input_signal_events.ri_up++;
2505                         else
2506                                 info->input_signal_events.ri_down++;
2507                 }
2508                 if (status & MISCSTATUS_DSR_LATCHED) {
2509                         icount->dsr++;
2510                         if ( status & SerialSignal_DSR )
2511                                 info->input_signal_events.dsr_up++;
2512                         else
2513                                 info->input_signal_events.dsr_down++;
2514                 }
2515                 if (status & MISCSTATUS_DCD_LATCHED) {
2516                         if ((info->dcd_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2517                                 info->ie1_value &= ~CDCD;
2518                                 write_reg(info, IE1, info->ie1_value);
2519                         }
2520                         icount->dcd++;
2521                         if (status & SerialSignal_DCD) {
2522                                 info->input_signal_events.dcd_up++;
2523                         } else
2524                                 info->input_signal_events.dcd_down++;
2525 #if SYNCLINK_GENERIC_HDLC
2526                         if (info->netcount) {
2527                                 if (status & SerialSignal_DCD)
2528                                         netif_carrier_on(info->netdev);
2529                                 else
2530                                         netif_carrier_off(info->netdev);
2531                         }
2532 #endif
2533                 }
2534                 if (status & MISCSTATUS_CTS_LATCHED)
2535                 {
2536                         if ((info->cts_chkcount)++ >= IO_PIN_SHUTDOWN_LIMIT) {
2537                                 info->ie1_value &= ~CCTS;
2538                                 write_reg(info, IE1, info->ie1_value);
2539                         }
2540                         icount->cts++;
2541                         if ( status & SerialSignal_CTS )
2542                                 info->input_signal_events.cts_up++;
2543                         else
2544                                 info->input_signal_events.cts_down++;
2545                 }
2546                 wake_up_interruptible(&info->status_event_wait_q);
2547                 wake_up_interruptible(&info->event_wait_q);
2548
2549                 if ( (info->flags & ASYNC_CHECK_CD) &&
2550                      (status & MISCSTATUS_DCD_LATCHED) ) {
2551                         if ( debug_level >= DEBUG_LEVEL_ISR )
2552                                 printk("%s CD now %s...", info->device_name,
2553                                        (status & SerialSignal_DCD) ? "on" : "off");
2554                         if (status & SerialSignal_DCD)
2555                                 wake_up_interruptible(&info->open_wait);
2556                         else {
2557                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2558                                         printk("doing serial hangup...");
2559                                 if (info->tty)
2560                                         tty_hangup(info->tty);
2561                         }
2562                 }
2563
2564                 if ( (info->flags & ASYNC_CTS_FLOW) &&
2565                      (status & MISCSTATUS_CTS_LATCHED) ) {
2566                         if ( info->tty ) {
2567                                 if (info->tty->hw_stopped) {
2568                                         if (status & SerialSignal_CTS) {
2569                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2570                                                         printk("CTS tx start...");
2571                                                 info->tty->hw_stopped = 0;
2572                                                 tx_start(info);
2573                                                 info->pending_bh |= BH_TRANSMIT;
2574                                                 return;
2575                                         }
2576                                 } else {
2577                                         if (!(status & SerialSignal_CTS)) {
2578                                                 if ( debug_level >= DEBUG_LEVEL_ISR )
2579                                                         printk("CTS tx stop...");
2580                                                 info->tty->hw_stopped = 1;
2581                                                 tx_stop(info);
2582                                         }
2583                                 }
2584                         }
2585                 }
2586         }
2587
2588         info->pending_bh |= BH_STATUS;
2589 }
2590
2591 /* Interrupt service routine entry point.
2592  *
2593  * Arguments:
2594  *      irq             interrupt number that caused interrupt
2595  *      dev_id          device ID supplied during interrupt registration
2596  *      regs            interrupted processor context
2597  */
2598 static irqreturn_t synclinkmp_interrupt(int irq, void *dev_id)
2599 {
2600         SLMP_INFO * info;
2601         unsigned char status, status0, status1=0;
2602         unsigned char dmastatus, dmastatus0, dmastatus1=0;
2603         unsigned char timerstatus0, timerstatus1=0;
2604         unsigned char shift;
2605         unsigned int i;
2606         unsigned short tmp;
2607
2608         if ( debug_level >= DEBUG_LEVEL_ISR )
2609                 printk("%s(%d): synclinkmp_interrupt(%d)entry.\n",
2610                         __FILE__,__LINE__,irq);
2611
2612         info = (SLMP_INFO *)dev_id;
2613         if (!info)
2614                 return IRQ_NONE;
2615
2616         spin_lock(&info->lock);
2617
2618         for(;;) {
2619
2620                 /* get status for SCA0 (ports 0-1) */
2621                 tmp = read_reg16(info, ISR0);   /* get ISR0 and ISR1 in one read */
2622                 status0 = (unsigned char)tmp;
2623                 dmastatus0 = (unsigned char)(tmp>>8);
2624                 timerstatus0 = read_reg(info, ISR2);
2625
2626                 if ( debug_level >= DEBUG_LEVEL_ISR )
2627                         printk("%s(%d):%s status0=%02x, dmastatus0=%02x, timerstatus0=%02x\n",
2628                                 __FILE__,__LINE__,info->device_name,
2629                                 status0,dmastatus0,timerstatus0);
2630
2631                 if (info->port_count == 4) {
2632                         /* get status for SCA1 (ports 2-3) */
2633                         tmp = read_reg16(info->port_array[2], ISR0);
2634                         status1 = (unsigned char)tmp;
2635                         dmastatus1 = (unsigned char)(tmp>>8);
2636                         timerstatus1 = read_reg(info->port_array[2], ISR2);
2637
2638                         if ( debug_level >= DEBUG_LEVEL_ISR )
2639                                 printk("%s(%d):%s status1=%02x, dmastatus1=%02x, timerstatus1=%02x\n",
2640                                         __FILE__,__LINE__,info->device_name,
2641                                         status1,dmastatus1,timerstatus1);
2642                 }
2643
2644                 if (!status0 && !dmastatus0 && !timerstatus0 &&
2645                          !status1 && !dmastatus1 && !timerstatus1)
2646                         break;
2647
2648                 for(i=0; i < info->port_count ; i++) {
2649                         if (info->port_array[i] == NULL)
2650                                 continue;
2651                         if (i < 2) {
2652                                 status = status0;
2653                                 dmastatus = dmastatus0;
2654                         } else {
2655                                 status = status1;
2656                                 dmastatus = dmastatus1;
2657                         }
2658
2659                         shift = i & 1 ? 4 :0;
2660
2661                         if (status & BIT0 << shift)
2662                                 isr_rxrdy(info->port_array[i]);
2663                         if (status & BIT1 << shift)
2664                                 isr_txrdy(info->port_array[i]);
2665                         if (status & BIT2 << shift)
2666                                 isr_rxint(info->port_array[i]);
2667                         if (status & BIT3 << shift)
2668                                 isr_txint(info->port_array[i]);
2669
2670                         if (dmastatus & BIT0 << shift)
2671                                 isr_rxdmaerror(info->port_array[i]);
2672                         if (dmastatus & BIT1 << shift)
2673                                 isr_rxdmaok(info->port_array[i]);
2674                         if (dmastatus & BIT2 << shift)
2675                                 isr_txdmaerror(info->port_array[i]);
2676                         if (dmastatus & BIT3 << shift)
2677                                 isr_txdmaok(info->port_array[i]);
2678                 }
2679
2680                 if (timerstatus0 & (BIT5 | BIT4))
2681                         isr_timer(info->port_array[0]);
2682                 if (timerstatus0 & (BIT7 | BIT6))
2683                         isr_timer(info->port_array[1]);
2684                 if (timerstatus1 & (BIT5 | BIT4))
2685                         isr_timer(info->port_array[2]);
2686                 if (timerstatus1 & (BIT7 | BIT6))
2687                         isr_timer(info->port_array[3]);
2688         }
2689
2690         for(i=0; i < info->port_count ; i++) {
2691                 SLMP_INFO * port = info->port_array[i];
2692
2693                 /* Request bottom half processing if there's something
2694                  * for it to do and the bh is not already running.
2695                  *
2696                  * Note: startup adapter diags require interrupts.
2697                  * do not request bottom half processing if the
2698                  * device is not open in a normal mode.
2699                  */
2700                 if ( port && (port->count || port->netcount) &&
2701                      port->pending_bh && !port->bh_running &&
2702                      !port->bh_requested ) {
2703                         if ( debug_level >= DEBUG_LEVEL_ISR )
2704                                 printk("%s(%d):%s queueing bh task.\n",
2705                                         __FILE__,__LINE__,port->device_name);
2706                         schedule_work(&port->task);
2707                         port->bh_requested = 1;
2708                 }
2709         }
2710
2711         spin_unlock(&info->lock);
2712
2713         if ( debug_level >= DEBUG_LEVEL_ISR )
2714                 printk("%s(%d):synclinkmp_interrupt(%d)exit.\n",
2715                         __FILE__,__LINE__,irq);
2716         return IRQ_HANDLED;
2717 }
2718
2719 /* Initialize and start device.
2720  */
2721 static int startup(SLMP_INFO * info)
2722 {
2723         if ( debug_level >= DEBUG_LEVEL_INFO )
2724                 printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
2725
2726         if (info->flags & ASYNC_INITIALIZED)
2727                 return 0;
2728
2729         if (!info->tx_buf) {
2730                 info->tx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
2731                 if (!info->tx_buf) {
2732                         printk(KERN_ERR"%s(%d):%s can't allocate transmit buffer\n",
2733                                 __FILE__,__LINE__,info->device_name);
2734                         return -ENOMEM;
2735                 }
2736         }
2737
2738         info->pending_bh = 0;
2739
2740         memset(&info->icount, 0, sizeof(info->icount));
2741
2742         /* program hardware for current parameters */
2743         reset_port(info);
2744
2745         change_params(info);
2746
2747         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
2748         add_timer(&info->status_timer);
2749
2750         if (info->tty)
2751                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
2752
2753         info->flags |= ASYNC_INITIALIZED;
2754
2755         return 0;
2756 }
2757
2758 /* Called by close() and hangup() to shutdown hardware
2759  */
2760 static void shutdown(SLMP_INFO * info)
2761 {
2762         unsigned long flags;
2763
2764         if (!(info->flags & ASYNC_INITIALIZED))
2765                 return;
2766
2767         if (debug_level >= DEBUG_LEVEL_INFO)
2768                 printk("%s(%d):%s synclinkmp_shutdown()\n",
2769                          __FILE__,__LINE__, info->device_name );
2770
2771         /* clear status wait queue because status changes */
2772         /* can't happen after shutting down the hardware */
2773         wake_up_interruptible(&info->status_event_wait_q);
2774         wake_up_interruptible(&info->event_wait_q);
2775
2776         del_timer(&info->tx_timer);
2777         del_timer(&info->status_timer);
2778
2779         kfree(info->tx_buf);
2780         info->tx_buf = NULL;
2781
2782         spin_lock_irqsave(&info->lock,flags);
2783
2784         reset_port(info);
2785
2786         if (!info->tty || info->tty->termios->c_cflag & HUPCL) {
2787                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
2788                 set_signals(info);
2789         }
2790
2791         spin_unlock_irqrestore(&info->lock,flags);
2792
2793         if (info->tty)
2794                 set_bit(TTY_IO_ERROR, &info->tty->flags);
2795
2796         info->flags &= ~ASYNC_INITIALIZED;
2797 }
2798
2799 static void program_hw(SLMP_INFO *info)
2800 {
2801         unsigned long flags;
2802
2803         spin_lock_irqsave(&info->lock,flags);
2804
2805         rx_stop(info);
2806         tx_stop(info);
2807
2808         info->tx_count = info->tx_put = info->tx_get = 0;
2809
2810         if (info->params.mode == MGSL_MODE_HDLC || info->netcount)
2811                 hdlc_mode(info);
2812         else
2813                 async_mode(info);
2814
2815         set_signals(info);
2816
2817         info->dcd_chkcount = 0;
2818         info->cts_chkcount = 0;
2819         info->ri_chkcount = 0;
2820         info->dsr_chkcount = 0;
2821
2822         info->ie1_value |= (CDCD|CCTS);
2823         write_reg(info, IE1, info->ie1_value);
2824
2825         get_signals(info);
2826
2827         if (info->netcount || (info->tty && info->tty->termios->c_cflag & CREAD) )
2828                 rx_start(info);
2829
2830         spin_unlock_irqrestore(&info->lock,flags);
2831 }
2832
2833 /* Reconfigure adapter based on new parameters
2834  */
2835 static void change_params(SLMP_INFO *info)
2836 {
2837         unsigned cflag;
2838         int bits_per_char;
2839
2840         if (!info->tty || !info->tty->termios)
2841                 return;
2842
2843         if (debug_level >= DEBUG_LEVEL_INFO)
2844                 printk("%s(%d):%s change_params()\n",
2845                          __FILE__,__LINE__, info->device_name );
2846
2847         cflag = info->tty->termios->c_cflag;
2848
2849         /* if B0 rate (hangup) specified then negate DTR and RTS */
2850         /* otherwise assert DTR and RTS */
2851         if (cflag & CBAUD)
2852                 info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
2853         else
2854                 info->serial_signals &= ~(SerialSignal_RTS + SerialSignal_DTR);
2855
2856         /* byte size and parity */
2857
2858         switch (cflag & CSIZE) {
2859               case CS5: info->params.data_bits = 5; break;
2860               case CS6: info->params.data_bits = 6; break;
2861               case CS7: info->params.data_bits = 7; break;
2862               case CS8: info->params.data_bits = 8; break;
2863               /* Never happens, but GCC is too dumb to figure it out */
2864               default:  info->params.data_bits = 7; break;
2865               }
2866
2867         if (cflag & CSTOPB)
2868                 info->params.stop_bits = 2;
2869         else
2870                 info->params.stop_bits = 1;
2871
2872         info->params.parity = ASYNC_PARITY_NONE;
2873         if (cflag & PARENB) {
2874                 if (cflag & PARODD)
2875                         info->params.parity = ASYNC_PARITY_ODD;
2876                 else
2877                         info->params.parity = ASYNC_PARITY_EVEN;
2878 #ifdef CMSPAR
2879                 if (cflag & CMSPAR)
2880                         info->params.parity = ASYNC_PARITY_SPACE;
2881 #endif
2882         }
2883
2884         /* calculate number of jiffies to transmit a full
2885          * FIFO (32 bytes) at specified data rate
2886          */
2887         bits_per_char = info->params.data_bits +
2888                         info->params.stop_bits + 1;
2889
2890         /* if port data rate is set to 460800 or less then
2891          * allow tty settings to override, otherwise keep the
2892          * current data rate.
2893          */
2894         if (info->params.data_rate <= 460800) {
2895                 info->params.data_rate = tty_get_baud_rate(info->tty);
2896         }
2897
2898         if ( info->params.data_rate ) {
2899                 info->timeout = (32*HZ*bits_per_char) /
2900                                 info->params.data_rate;
2901         }
2902         info->timeout += HZ/50;         /* Add .02 seconds of slop */
2903
2904         if (cflag & CRTSCTS)
2905                 info->flags |= ASYNC_CTS_FLOW;
2906         else
2907                 info->flags &= ~ASYNC_CTS_FLOW;
2908
2909         if (cflag & CLOCAL)
2910                 info->flags &= ~ASYNC_CHECK_CD;
2911         else
2912                 info->flags |= ASYNC_CHECK_CD;
2913
2914         /* process tty input control flags */
2915
2916         info->read_status_mask2 = OVRN;
2917         if (I_INPCK(info->tty))
2918                 info->read_status_mask2 |= PE | FRME;
2919         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
2920                 info->read_status_mask1 |= BRKD;
2921         if (I_IGNPAR(info->tty))
2922                 info->ignore_status_mask2 |= PE | FRME;
2923         if (I_IGNBRK(info->tty)) {
2924                 info->ignore_status_mask1 |= BRKD;
2925                 /* If ignoring parity and break indicators, ignore
2926                  * overruns too.  (For real raw support).
2927                  */
2928                 if (I_IGNPAR(info->tty))
2929                         info->ignore_status_mask2 |= OVRN;
2930         }
2931
2932         program_hw(info);
2933 }
2934
2935 static int get_stats(SLMP_INFO * info, struct mgsl_icount __user *user_icount)
2936 {
2937         int err;
2938
2939         if (debug_level >= DEBUG_LEVEL_INFO)
2940                 printk("%s(%d):%s get_params()\n",
2941                          __FILE__,__LINE__, info->device_name);
2942
2943         if (!user_icount) {
2944                 memset(&info->icount, 0, sizeof(info->icount));
2945         } else {
2946                 COPY_TO_USER(err, user_icount, &info->icount, sizeof(struct mgsl_icount));
2947                 if (err)
2948                         return -EFAULT;
2949         }
2950
2951         return 0;
2952 }
2953
2954 static int get_params(SLMP_INFO * info, MGSL_PARAMS __user *user_params)
2955 {
2956         int err;
2957         if (debug_level >= DEBUG_LEVEL_INFO)
2958                 printk("%s(%d):%s get_params()\n",
2959                          __FILE__,__LINE__, info->device_name);
2960
2961         COPY_TO_USER(err,user_params, &info->params, sizeof(MGSL_PARAMS));
2962         if (err) {
2963                 if ( debug_level >= DEBUG_LEVEL_INFO )
2964                         printk( "%s(%d):%s get_params() user buffer copy failed\n",
2965                                 __FILE__,__LINE__,info->device_name);
2966                 return -EFAULT;
2967         }
2968
2969         return 0;
2970 }
2971
2972 static int set_params(SLMP_INFO * info, MGSL_PARAMS __user *new_params)
2973 {
2974         unsigned long flags;
2975         MGSL_PARAMS tmp_params;
2976         int err;
2977
2978         if (debug_level >= DEBUG_LEVEL_INFO)
2979                 printk("%s(%d):%s set_params\n",
2980                         __FILE__,__LINE__,info->device_name );
2981         COPY_FROM_USER(err,&tmp_params, new_params, sizeof(MGSL_PARAMS));
2982         if (err) {
2983                 if ( debug_level >= DEBUG_LEVEL_INFO )
2984                         printk( "%s(%d):%s set_params() user buffer copy failed\n",
2985                                 __FILE__,__LINE__,info->device_name);
2986                 return -EFAULT;
2987         }
2988
2989         spin_lock_irqsave(&info->lock,flags);
2990         memcpy(&info->params,&tmp_params,sizeof(MGSL_PARAMS));
2991         spin_unlock_irqrestore(&info->lock,flags);
2992
2993         change_params(info);
2994
2995         return 0;
2996 }
2997
2998 static int get_txidle(SLMP_INFO * info, int __user *idle_mode)
2999 {
3000         int err;
3001
3002         if (debug_level >= DEBUG_LEVEL_INFO)
3003                 printk("%s(%d):%s get_txidle()=%d\n",
3004                          __FILE__,__LINE__, info->device_name, info->idle_mode);
3005
3006         COPY_TO_USER(err,idle_mode, &info->idle_mode, sizeof(int));
3007         if (err) {
3008                 if ( debug_level >= DEBUG_LEVEL_INFO )
3009                         printk( "%s(%d):%s get_txidle() user buffer copy failed\n",
3010                                 __FILE__,__LINE__,info->device_name);
3011                 return -EFAULT;
3012         }
3013
3014         return 0;
3015 }
3016
3017 static int set_txidle(SLMP_INFO * info, int idle_mode)
3018 {
3019         unsigned long flags;
3020
3021         if (debug_level >= DEBUG_LEVEL_INFO)
3022                 printk("%s(%d):%s set_txidle(%d)\n",
3023                         __FILE__,__LINE__,info->device_name, idle_mode );
3024
3025         spin_lock_irqsave(&info->lock,flags);
3026         info->idle_mode = idle_mode;
3027         tx_set_idle( info );
3028         spin_unlock_irqrestore(&info->lock,flags);
3029         return 0;
3030 }
3031
3032 static int tx_enable(SLMP_INFO * info, int enable)
3033 {
3034         unsigned long flags;
3035
3036         if (debug_level >= DEBUG_LEVEL_INFO)
3037                 printk("%s(%d):%s tx_enable(%d)\n",
3038                         __FILE__,__LINE__,info->device_name, enable);
3039
3040         spin_lock_irqsave(&info->lock,flags);
3041         if ( enable ) {
3042                 if ( !info->tx_enabled ) {
3043                         tx_start(info);
3044                 }
3045         } else {
3046                 if ( info->tx_enabled )
3047                         tx_stop(info);
3048         }
3049         spin_unlock_irqrestore(&info->lock,flags);
3050         return 0;
3051 }
3052
3053 /* abort send HDLC frame
3054  */
3055 static int tx_abort(SLMP_INFO * info)
3056 {
3057         unsigned long flags;
3058
3059         if (debug_level >= DEBUG_LEVEL_INFO)
3060                 printk("%s(%d):%s tx_abort()\n",
3061                         __FILE__,__LINE__,info->device_name);
3062
3063         spin_lock_irqsave(&info->lock,flags);
3064         if ( info->tx_active && info->params.mode == MGSL_MODE_HDLC ) {
3065                 info->ie1_value &= ~UDRN;
3066                 info->ie1_value |= IDLE;
3067                 write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
3068                 write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
3069
3070                 write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
3071                 write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
3072
3073                 write_reg(info, CMD, TXABORT);
3074         }
3075         spin_unlock_irqrestore(&info->lock,flags);
3076         return 0;
3077 }
3078
3079 static int rx_enable(SLMP_INFO * info, int enable)
3080 {
3081         unsigned long flags;
3082
3083         if (debug_level >= DEBUG_LEVEL_INFO)
3084                 printk("%s(%d):%s rx_enable(%d)\n",
3085                         __FILE__,__LINE__,info->device_name,enable);
3086
3087         spin_lock_irqsave(&info->lock,flags);
3088         if ( enable ) {
3089                 if ( !info->rx_enabled )
3090                         rx_start(info);
3091         } else {
3092                 if ( info->rx_enabled )
3093                         rx_stop(info);
3094         }
3095         spin_unlock_irqrestore(&info->lock,flags);
3096         return 0;
3097 }
3098
3099 /* wait for specified event to occur
3100  */
3101 static int wait_mgsl_event(SLMP_INFO * info, int __user *mask_ptr)
3102 {
3103         unsigned long flags;
3104         int s;
3105         int rc=0;
3106         struct mgsl_icount cprev, cnow;
3107         int events;
3108         int mask;
3109         struct  _input_signal_events oldsigs, newsigs;
3110         DECLARE_WAITQUEUE(wait, current);
3111
3112         COPY_FROM_USER(rc,&mask, mask_ptr, sizeof(int));
3113         if (rc) {
3114                 return  -EFAULT;
3115         }
3116
3117         if (debug_level >= DEBUG_LEVEL_INFO)
3118                 printk("%s(%d):%s wait_mgsl_event(%d)\n",
3119                         __FILE__,__LINE__,info->device_name,mask);
3120
3121         spin_lock_irqsave(&info->lock,flags);
3122
3123         /* return immediately if state matches requested events */
3124         get_signals(info);
3125         s = info->serial_signals;
3126
3127         events = mask &
3128                 ( ((s & SerialSignal_DSR) ? MgslEvent_DsrActive:MgslEvent_DsrInactive) +
3129                   ((s & SerialSignal_DCD) ? MgslEvent_DcdActive:MgslEvent_DcdInactive) +
3130                   ((s & SerialSignal_CTS) ? MgslEvent_CtsActive:MgslEvent_CtsInactive) +
3131                   ((s & SerialSignal_RI)  ? MgslEvent_RiActive :MgslEvent_RiInactive) );
3132         if (events) {
3133                 spin_unlock_irqrestore(&info->lock,flags);
3134                 goto exit;
3135         }
3136
3137         /* save current irq counts */
3138         cprev = info->icount;
3139         oldsigs = info->input_signal_events;
3140
3141         /* enable hunt and idle irqs if needed */
3142         if (mask & (MgslEvent_ExitHuntMode+MgslEvent_IdleReceived)) {
3143                 unsigned char oldval = info->ie1_value;
3144                 unsigned char newval = oldval +
3145                          (mask & MgslEvent_ExitHuntMode ? FLGD:0) +
3146                          (mask & MgslEvent_IdleReceived ? IDLD:0);
3147                 if ( oldval != newval ) {
3148                         info->ie1_value = newval;
3149                         write_reg(info, IE1, info->ie1_value);
3150                 }
3151         }
3152
3153         set_current_state(TASK_INTERRUPTIBLE);
3154         add_wait_queue(&info->event_wait_q, &wait);
3155
3156         spin_unlock_irqrestore(&info->lock,flags);
3157
3158         for(;;) {
3159                 schedule();
3160                 if (signal_pending(current)) {
3161                         rc = -ERESTARTSYS;
3162                         break;
3163                 }
3164
3165                 /* get current irq counts */
3166                 spin_lock_irqsave(&info->lock,flags);
3167                 cnow = info->icount;
3168                 newsigs = info->input_signal_events;
3169                 set_current_state(TASK_INTERRUPTIBLE);
3170                 spin_unlock_irqrestore(&info->lock,flags);
3171
3172                 /* if no change, wait aborted for some reason */
3173                 if (newsigs.dsr_up   == oldsigs.dsr_up   &&
3174                     newsigs.dsr_down == oldsigs.dsr_down &&
3175                     newsigs.dcd_up   == oldsigs.dcd_up   &&
3176                     newsigs.dcd_down == oldsigs.dcd_down &&
3177                     newsigs.cts_up   == oldsigs.cts_up   &&
3178                     newsigs.cts_down == oldsigs.cts_down &&
3179                     newsigs.ri_up    == oldsigs.ri_up    &&
3180                     newsigs.ri_down  == oldsigs.ri_down  &&
3181                     cnow.exithunt    == cprev.exithunt   &&
3182                     cnow.rxidle      == cprev.rxidle) {
3183                         rc = -EIO;
3184                         break;
3185                 }
3186
3187                 events = mask &
3188                         ( (newsigs.dsr_up   != oldsigs.dsr_up   ? MgslEvent_DsrActive:0)   +
3189                           (newsigs.dsr_down != oldsigs.dsr_down ? MgslEvent_DsrInactive:0) +
3190                           (newsigs.dcd_up   != oldsigs.dcd_up   ? MgslEvent_DcdActive:0)   +
3191                           (newsigs.dcd_down != oldsigs.dcd_down ? MgslEvent_DcdInactive:0) +
3192                           (newsigs.cts_up   != oldsigs.cts_up   ? MgslEvent_CtsActive:0)   +
3193                           (newsigs.cts_down != oldsigs.cts_down ? MgslEvent_CtsInactive:0) +
3194                           (newsigs.ri_up    != oldsigs.ri_up    ? MgslEvent_RiActive:0)    +
3195                           (newsigs.ri_down  != oldsigs.ri_down  ? MgslEvent_RiInactive:0)  +
3196                           (cnow.exithunt    != cprev.exithunt   ? MgslEvent_ExitHuntMode:0) +
3197                           (cnow.rxidle      != cprev.rxidle     ? MgslEvent_IdleReceived:0) );
3198                 if (events)
3199                         break;
3200
3201                 cprev = cnow;
3202                 oldsigs = newsigs;
3203         }
3204
3205         remove_wait_queue(&info->event_wait_q, &wait);
3206         set_current_state(TASK_RUNNING);
3207
3208
3209         if (mask & (MgslEvent_ExitHuntMode + MgslEvent_IdleReceived)) {
3210                 spin_lock_irqsave(&info->lock,flags);
3211                 if (!waitqueue_active(&info->event_wait_q)) {
3212                         /* disable enable exit hunt mode/idle rcvd IRQs */
3213                         info->ie1_value &= ~(FLGD|IDLD);
3214                         write_reg(info, IE1, info->ie1_value);
3215                 }
3216                 spin_unlock_irqrestore(&info->lock,flags);
3217         }
3218 exit:
3219         if ( rc == 0 )
3220                 PUT_USER(rc, events, mask_ptr);
3221
3222         return rc;
3223 }
3224
3225 static int modem_input_wait(SLMP_INFO *info,int arg)
3226 {
3227         unsigned long flags;
3228         int rc;
3229         struct mgsl_icount cprev, cnow;
3230         DECLARE_WAITQUEUE(wait, current);
3231
3232         /* save current irq counts */
3233         spin_lock_irqsave(&info->lock,flags);
3234         cprev = info->icount;
3235         add_wait_queue(&info->status_event_wait_q, &wait);
3236         set_current_state(TASK_INTERRUPTIBLE);
3237         spin_unlock_irqrestore(&info->lock,flags);
3238
3239         for(;;) {
3240                 schedule();
3241                 if (signal_pending(current)) {
3242                         rc = -ERESTARTSYS;
3243                         break;
3244                 }
3245
3246                 /* get new irq counts */
3247                 spin_lock_irqsave(&info->lock,flags);
3248                 cnow = info->icount;
3249                 set_current_state(TASK_INTERRUPTIBLE);
3250                 spin_unlock_irqrestore(&info->lock,flags);
3251
3252                 /* if no change, wait aborted for some reason */
3253                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
3254                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) {
3255                         rc = -EIO;
3256                         break;
3257                 }
3258
3259                 /* check for change in caller specified modem input */
3260                 if ((arg & TIOCM_RNG && cnow.rng != cprev.rng) ||
3261                     (arg & TIOCM_DSR && cnow.dsr != cprev.dsr) ||
3262                     (arg & TIOCM_CD  && cnow.dcd != cprev.dcd) ||
3263                     (arg & TIOCM_CTS && cnow.cts != cprev.cts)) {
3264                         rc = 0;
3265                         break;
3266                 }
3267
3268                 cprev = cnow;
3269         }
3270         remove_wait_queue(&info->status_event_wait_q, &wait);
3271         set_current_state(TASK_RUNNING);
3272         return rc;
3273 }
3274
3275 /* return the state of the serial control and status signals
3276  */
3277 static int tiocmget(struct tty_struct *tty, struct file *file)
3278 {
3279         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3280         unsigned int result;
3281         unsigned long flags;
3282
3283         spin_lock_irqsave(&info->lock,flags);
3284         get_signals(info);
3285         spin_unlock_irqrestore(&info->lock,flags);
3286
3287         result = ((info->serial_signals & SerialSignal_RTS) ? TIOCM_RTS:0) +
3288                 ((info->serial_signals & SerialSignal_DTR) ? TIOCM_DTR:0) +
3289                 ((info->serial_signals & SerialSignal_DCD) ? TIOCM_CAR:0) +
3290                 ((info->serial_signals & SerialSignal_RI)  ? TIOCM_RNG:0) +
3291                 ((info->serial_signals & SerialSignal_DSR) ? TIOCM_DSR:0) +
3292                 ((info->serial_signals & SerialSignal_CTS) ? TIOCM_CTS:0);
3293
3294         if (debug_level >= DEBUG_LEVEL_INFO)
3295                 printk("%s(%d):%s tiocmget() value=%08X\n",
3296                          __FILE__,__LINE__, info->device_name, result );
3297         return result;
3298 }
3299
3300 /* set modem control signals (DTR/RTS)
3301  */
3302 static int tiocmset(struct tty_struct *tty, struct file *file,
3303                     unsigned int set, unsigned int clear)
3304 {
3305         SLMP_INFO *info = (SLMP_INFO *)tty->driver_data;
3306         unsigned long flags;
3307
3308         if (debug_level >= DEBUG_LEVEL_INFO)
3309                 printk("%s(%d):%s tiocmset(%x,%x)\n",
3310                         __FILE__,__LINE__,info->device_name, set, clear);
3311
3312         if (set & TIOCM_RTS)
3313                 info->serial_signals |= SerialSignal_RTS;
3314         if (set & TIOCM_DTR)
3315                 info->serial_signals |= SerialSignal_DTR;
3316         if (clear & TIOCM_RTS)
3317                 info->serial_signals &= ~SerialSignal_RTS;
3318         if (clear & TIOCM_DTR)
3319                 info->serial_signals &= ~SerialSignal_DTR;
3320
3321         spin_lock_irqsave(&info->lock,flags);
3322         set_signals(info);
3323         spin_unlock_irqrestore(&info->lock,flags);
3324
3325         return 0;
3326 }
3327
3328
3329
3330 /* Block the current process until the specified port is ready to open.
3331  */
3332 static int block_til_ready(struct tty_struct *tty, struct file *filp,
3333                            SLMP_INFO *info)
3334 {
3335         DECLARE_WAITQUEUE(wait, current);
3336         int             retval;
3337         int             do_clocal = 0, extra_count = 0;
3338         unsigned long   flags;
3339
3340         if (debug_level >= DEBUG_LEVEL_INFO)
3341                 printk("%s(%d):%s block_til_ready()\n",
3342                          __FILE__,__LINE__, tty->driver->name );
3343
3344         if (filp->f_flags & O_NONBLOCK || tty->flags & (1 << TTY_IO_ERROR)){
3345                 /* nonblock mode is set or port is not enabled */
3346                 /* just verify that callout device is not active */
3347                 info->flags |= ASYNC_NORMAL_ACTIVE;
3348                 return 0;
3349         }
3350
3351         if (tty->termios->c_cflag & CLOCAL)
3352                 do_clocal = 1;
3353
3354         /* Wait for carrier detect and the line to become
3355          * free (i.e., not in use by the callout).  While we are in
3356          * this loop, info->count is dropped by one, so that
3357          * close() knows when to free things.  We restore it upon
3358          * exit, either normal or abnormal.
3359          */
3360
3361         retval = 0;
3362         add_wait_queue(&info->open_wait, &wait);
3363
3364         if (debug_level >= DEBUG_LEVEL_INFO)
3365                 printk("%s(%d):%s block_til_ready() before block, count=%d\n",
3366                          __FILE__,__LINE__, tty->driver->name, info->count );
3367
3368         spin_lock_irqsave(&info->lock, flags);
3369         if (!tty_hung_up_p(filp)) {
3370                 extra_count = 1;
3371                 info->count--;
3372         }
3373         spin_unlock_irqrestore(&info->lock, flags);
3374         info->blocked_open++;
3375
3376         while (1) {
3377                 if ((tty->termios->c_cflag & CBAUD)) {
3378                         spin_lock_irqsave(&info->lock,flags);
3379                         info->serial_signals |= SerialSignal_RTS + SerialSignal_DTR;
3380                         set_signals(info);
3381                         spin_unlock_irqrestore(&info->lock,flags);
3382                 }
3383
3384                 set_current_state(TASK_INTERRUPTIBLE);
3385
3386                 if (tty_hung_up_p(filp) || !(info->flags & ASYNC_INITIALIZED)){
3387                         retval = (info->flags & ASYNC_HUP_NOTIFY) ?
3388                                         -EAGAIN : -ERESTARTSYS;
3389                         break;
3390                 }
3391
3392                 spin_lock_irqsave(&info->lock,flags);
3393                 get_signals(info);
3394                 spin_unlock_irqrestore(&info->lock,flags);
3395
3396                 if (!(info->flags & ASYNC_CLOSING) &&
3397                     (do_clocal || (info->serial_signals & SerialSignal_DCD)) ) {
3398                         break;
3399                 }
3400
3401                 if (signal_pending(current)) {
3402                         retval = -ERESTARTSYS;
3403                         break;
3404                 }
3405
3406                 if (debug_level >= DEBUG_LEVEL_INFO)
3407                         printk("%s(%d):%s block_til_ready() count=%d\n",
3408                                  __FILE__,__LINE__, tty->driver->name, info->count );
3409
3410                 schedule();
3411         }
3412
3413         set_current_state(TASK_RUNNING);
3414         remove_wait_queue(&info->open_wait, &wait);
3415
3416         if (extra_count)
3417                 info->count++;
3418         info->blocked_open--;
3419
3420         if (debug_level >= DEBUG_LEVEL_INFO)
3421                 printk("%s(%d):%s block_til_ready() after, count=%d\n",
3422                          __FILE__,__LINE__, tty->driver->name, info->count );
3423
3424         if (!retval)
3425                 info->flags |= ASYNC_NORMAL_ACTIVE;
3426
3427         return retval;
3428 }
3429
3430 int alloc_dma_bufs(SLMP_INFO *info)
3431 {
3432         unsigned short BuffersPerFrame;
3433         unsigned short BufferCount;
3434
3435         // Force allocation to start at 64K boundary for each port.
3436         // This is necessary because *all* buffer descriptors for a port
3437         // *must* be in the same 64K block. All descriptors on a port
3438         // share a common 'base' address (upper 8 bits of 24 bits) programmed
3439         // into the CBP register.
3440         info->port_array[0]->last_mem_alloc = (SCA_MEM_SIZE/4) * info->port_num;
3441
3442         /* Calculate the number of DMA buffers necessary to hold the */
3443         /* largest allowable frame size. Note: If the max frame size is */
3444         /* not an even multiple of the DMA buffer size then we need to */
3445         /* round the buffer count per frame up one. */
3446
3447         BuffersPerFrame = (unsigned short)(info->max_frame_size/SCABUFSIZE);
3448         if ( info->max_frame_size % SCABUFSIZE )
3449                 BuffersPerFrame++;
3450
3451         /* calculate total number of data buffers (SCABUFSIZE) possible
3452          * in one ports memory (SCA_MEM_SIZE/4) after allocating memory
3453          * for the descriptor list (BUFFERLISTSIZE).
3454          */
3455         BufferCount = (SCA_MEM_SIZE/4 - BUFFERLISTSIZE)/SCABUFSIZE;
3456
3457         /* limit number of buffers to maximum amount of descriptors */
3458         if (BufferCount > BUFFERLISTSIZE/sizeof(SCADESC))
3459                 BufferCount = BUFFERLISTSIZE/sizeof(SCADESC);
3460
3461         /* use enough buffers to transmit one max size frame */
3462         info->tx_buf_count = BuffersPerFrame + 1;
3463
3464         /* never use more than half the available buffers for transmit */
3465         if (info->tx_buf_count > (BufferCount/2))
3466                 info->tx_buf_count = BufferCount/2;
3467
3468         if (info->tx_buf_count > SCAMAXDESC)
3469                 info->tx_buf_count = SCAMAXDESC;
3470
3471         /* use remaining buffers for receive */
3472         info->rx_buf_count = BufferCount - info->tx_buf_count;
3473
3474         if (info->rx_buf_count > SCAMAXDESC)
3475                 info->rx_buf_count = SCAMAXDESC;
3476
3477         if ( debug_level >= DEBUG_LEVEL_INFO )
3478                 printk("%s(%d):%s Allocating %d TX and %d RX DMA buffers.\n",
3479                         __FILE__,__LINE__, info->device_name,
3480                         info->tx_buf_count,info->rx_buf_count);
3481
3482         if ( alloc_buf_list( info ) < 0 ||
3483                 alloc_frame_bufs(info,
3484                                         info->rx_buf_list,
3485                                         info->rx_buf_list_ex,
3486                                         info->rx_buf_count) < 0 ||
3487                 alloc_frame_bufs(info,
3488                                         info->tx_buf_list,
3489                                         info->tx_buf_list_ex,
3490                                         info->tx_buf_count) < 0 ||
3491                 alloc_tmp_rx_buf(info) < 0 ) {
3492                 printk("%s(%d):%s Can't allocate DMA buffer memory\n",
3493                         __FILE__,__LINE__, info->device_name);
3494                 return -ENOMEM;
3495         }
3496
3497         rx_reset_buffers( info );
3498
3499         return 0;
3500 }
3501
3502 /* Allocate DMA buffers for the transmit and receive descriptor lists.
3503  */
3504 int alloc_buf_list(SLMP_INFO *info)
3505 {
3506         unsigned int i;
3507
3508         /* build list in adapter shared memory */
3509         info->buffer_list = info->memory_base + info->port_array[0]->last_mem_alloc;
3510         info->buffer_list_phys = info->port_array[0]->last_mem_alloc;
3511         info->port_array[0]->last_mem_alloc += BUFFERLISTSIZE;
3512
3513         memset(info->buffer_list, 0, BUFFERLISTSIZE);
3514
3515         /* Save virtual address pointers to the receive and */
3516         /* transmit buffer lists. (Receive 1st). These pointers will */
3517         /* be used by the processor to access the lists. */
3518         info->rx_buf_list = (SCADESC *)info->buffer_list;
3519
3520         info->tx_buf_list = (SCADESC *)info->buffer_list;
3521         info->tx_buf_list += info->rx_buf_count;
3522
3523         /* Build links for circular buffer entry lists (tx and rx)
3524          *
3525          * Note: links are physical addresses read by the SCA device
3526          * to determine the next buffer entry to use.
3527          */
3528
3529         for ( i = 0; i < info->rx_buf_count; i++ ) {
3530                 /* calculate and store physical address of this buffer entry */
3531                 info->rx_buf_list_ex[i].phys_entry =
3532                         info->buffer_list_phys + (i * sizeof(SCABUFSIZE));
3533
3534                 /* calculate and store physical address of */
3535                 /* next entry in cirular list of entries */
3536                 info->rx_buf_list[i].next = info->buffer_list_phys;
3537                 if ( i < info->rx_buf_count - 1 )
3538                         info->rx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3539
3540                 info->rx_buf_list[i].length = SCABUFSIZE;
3541         }
3542
3543         for ( i = 0; i < info->tx_buf_count; i++ ) {
3544                 /* calculate and store physical address of this buffer entry */
3545                 info->tx_buf_list_ex[i].phys_entry = info->buffer_list_phys +
3546                         ((info->rx_buf_count + i) * sizeof(SCADESC));
3547
3548                 /* calculate and store physical address of */
3549                 /* next entry in cirular list of entries */
3550
3551                 info->tx_buf_list[i].next = info->buffer_list_phys +
3552                         info->rx_buf_count * sizeof(SCADESC);
3553
3554                 if ( i < info->tx_buf_count - 1 )
3555                         info->tx_buf_list[i].next += (i + 1) * sizeof(SCADESC);
3556         }
3557
3558         return 0;
3559 }
3560
3561 /* Allocate the frame DMA buffers used by the specified buffer list.
3562  */
3563 int alloc_frame_bufs(SLMP_INFO *info, SCADESC *buf_list,SCADESC_EX *buf_list_ex,int count)
3564 {
3565         int i;
3566         unsigned long phys_addr;
3567
3568         for ( i = 0; i < count; i++ ) {
3569                 buf_list_ex[i].virt_addr = info->memory_base + info->port_array[0]->last_mem_alloc;
3570                 phys_addr = info->port_array[0]->last_mem_alloc;
3571                 info->port_array[0]->last_mem_alloc += SCABUFSIZE;
3572
3573                 buf_list[i].buf_ptr  = (unsigned short)phys_addr;
3574                 buf_list[i].buf_base = (unsigned char)(phys_addr >> 16);
3575         }
3576
3577         return 0;
3578 }
3579
3580 void free_dma_bufs(SLMP_INFO *info)
3581 {
3582         info->buffer_list = NULL;
3583         info->rx_buf_list = NULL;
3584         info->tx_buf_list = NULL;
3585 }
3586
3587 /* allocate buffer large enough to hold max_frame_size.
3588  * This buffer is used to pass an assembled frame to the line discipline.
3589  */
3590 int alloc_tmp_rx_buf(SLMP_INFO *info)
3591 {
3592         info->tmp_rx_buf = kmalloc(info->max_frame_size, GFP_KERNEL);
3593         if (info->tmp_rx_buf == NULL)
3594                 return -ENOMEM;
3595         return 0;
3596 }
3597
3598 void free_tmp_rx_buf(SLMP_INFO *info)
3599 {
3600         kfree(info->tmp_rx_buf);
3601         info->tmp_rx_buf = NULL;
3602 }
3603
3604 int claim_resources(SLMP_INFO *info)
3605 {
3606         if (request_mem_region(info->phys_memory_base,SCA_MEM_SIZE,"synclinkmp") == NULL) {
3607                 printk( "%s(%d):%s mem addr conflict, Addr=%08X\n",
3608                         __FILE__,__LINE__,info->device_name, info->phys_memory_base);
3609                 info->init_error = DiagStatus_AddressConflict;
3610                 goto errout;
3611         }
3612         else
3613                 info->shared_mem_requested = 1;
3614
3615         if (request_mem_region(info->phys_lcr_base + info->lcr_offset,128,"synclinkmp") == NULL) {
3616                 printk( "%s(%d):%s lcr mem addr conflict, Addr=%08X\n",
3617                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base);
3618                 info->init_error = DiagStatus_AddressConflict;
3619                 goto errout;
3620         }
3621         else
3622                 info->lcr_mem_requested = 1;
3623
3624         if (request_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE,"synclinkmp") == NULL) {
3625                 printk( "%s(%d):%s sca mem addr conflict, Addr=%08X\n",
3626                         __FILE__,__LINE__,info->device_name, info->phys_sca_base);
3627                 info->init_error = DiagStatus_AddressConflict;
3628                 goto errout;
3629         }
3630         else
3631                 info->sca_base_requested = 1;
3632
3633         if (request_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE,"synclinkmp") == NULL) {
3634                 printk( "%s(%d):%s stat/ctrl mem addr conflict, Addr=%08X\n",
3635                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base);
3636                 info->init_error = DiagStatus_AddressConflict;
3637                 goto errout;
3638         }
3639         else
3640                 info->sca_statctrl_requested = 1;
3641
3642         info->memory_base = ioremap(info->phys_memory_base,SCA_MEM_SIZE);
3643         if (!info->memory_base) {
3644                 printk( "%s(%d):%s Cant map shared memory, MemAddr=%08X\n",
3645                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3646                 info->init_error = DiagStatus_CantAssignPciResources;
3647                 goto errout;
3648         }
3649
3650         info->lcr_base = ioremap(info->phys_lcr_base,PAGE_SIZE);
3651         if (!info->lcr_base) {
3652                 printk( "%s(%d):%s Cant map LCR memory, MemAddr=%08X\n",
3653                         __FILE__,__LINE__,info->device_name, info->phys_lcr_base );
3654                 info->init_error = DiagStatus_CantAssignPciResources;
3655                 goto errout;
3656         }
3657         info->lcr_base += info->lcr_offset;
3658
3659         info->sca_base = ioremap(info->phys_sca_base,PAGE_SIZE);
3660         if (!info->sca_base) {
3661                 printk( "%s(%d):%s Cant map SCA memory, MemAddr=%08X\n",
3662                         __FILE__,__LINE__,info->device_name, info->phys_sca_base );
3663                 info->init_error = DiagStatus_CantAssignPciResources;
3664                 goto errout;
3665         }
3666         info->sca_base += info->sca_offset;
3667
3668         info->statctrl_base = ioremap(info->phys_statctrl_base,PAGE_SIZE);
3669         if (!info->statctrl_base) {
3670                 printk( "%s(%d):%s Cant map SCA Status/Control memory, MemAddr=%08X\n",
3671                         __FILE__,__LINE__,info->device_name, info->phys_statctrl_base );
3672                 info->init_error = DiagStatus_CantAssignPciResources;
3673                 goto errout;
3674         }
3675         info->statctrl_base += info->statctrl_offset;
3676
3677         if ( !memory_test(info) ) {
3678                 printk( "%s(%d):Shared Memory Test failed for device %s MemAddr=%08X\n",
3679                         __FILE__,__LINE__,info->device_name, info->phys_memory_base );
3680                 info->init_error = DiagStatus_MemoryError;
3681                 goto errout;
3682         }
3683
3684         return 0;
3685
3686 errout:
3687         release_resources( info );
3688         return -ENODEV;
3689 }
3690
3691 void release_resources(SLMP_INFO *info)
3692 {
3693         if ( debug_level >= DEBUG_LEVEL_INFO )
3694                 printk( "%s(%d):%s release_resources() entry\n",
3695                         __FILE__,__LINE__,info->device_name );
3696
3697         if ( info->irq_requested ) {
3698                 free_irq(info->irq_level, info);
3699                 info->irq_requested = 0;
3700         }
3701
3702         if ( info->shared_mem_requested ) {
3703                 release_mem_region(info->phys_memory_base,SCA_MEM_SIZE);
3704                 info->shared_mem_requested = 0;
3705         }
3706         if ( info->lcr_mem_requested ) {
3707                 release_mem_region(info->phys_lcr_base + info->lcr_offset,128);
3708                 info->lcr_mem_requested = 0;
3709         }
3710         if ( info->sca_base_requested ) {
3711                 release_mem_region(info->phys_sca_base + info->sca_offset,SCA_BASE_SIZE);
3712                 info->sca_base_requested = 0;
3713         }
3714         if ( info->sca_statctrl_requested ) {
3715                 release_mem_region(info->phys_statctrl_base + info->statctrl_offset,SCA_REG_SIZE);
3716                 info->sca_statctrl_requested = 0;
3717         }
3718
3719         if (info->memory_base){
3720                 iounmap(info->memory_base);
3721                 info->memory_base = NULL;
3722         }
3723
3724         if (info->sca_base) {
3725                 iounmap(info->sca_base - info->sca_offset);
3726                 info->sca_base=NULL;
3727         }
3728
3729         if (info->statctrl_base) {
3730                 iounmap(info->statctrl_base - info->statctrl_offset);
3731                 info->statctrl_base=NULL;
3732         }
3733
3734         if (info->lcr_base){
3735                 iounmap(info->lcr_base - info->lcr_offset);
3736                 info->lcr_base = NULL;
3737         }
3738
3739         if ( debug_level >= DEBUG_LEVEL_INFO )
3740                 printk( "%s(%d):%s release_resources() exit\n",
3741                         __FILE__,__LINE__,info->device_name );
3742 }
3743
3744 /* Add the specified device instance data structure to the
3745  * global linked list of devices and increment the device count.
3746  */
3747 void add_device(SLMP_INFO *info)
3748 {
3749         info->next_device = NULL;
3750         info->line = synclinkmp_device_count;
3751         sprintf(info->device_name,"ttySLM%dp%d",info->adapter_num,info->port_num);
3752
3753         if (info->line < MAX_DEVICES) {
3754                 if (maxframe[info->line])
3755                         info->max_frame_size = maxframe[info->line];
3756                 info->dosyncppp = dosyncppp[info->line];
3757         }
3758
3759         synclinkmp_device_count++;
3760
3761         if ( !synclinkmp_device_list )
3762                 synclinkmp_device_list = info;
3763         else {
3764                 SLMP_INFO *current_dev = synclinkmp_device_list;
3765                 while( current_dev->next_device )
3766                         current_dev = current_dev->next_device;
3767                 current_dev->next_device = info;
3768         }
3769
3770         if ( info->max_frame_size < 4096 )
3771                 info->max_frame_size = 4096;
3772         else if ( info->max_frame_size > 65535 )
3773                 info->max_frame_size = 65535;
3774
3775         printk( "SyncLink MultiPort %s: "
3776                 "Mem=(%08x %08X %08x %08X) IRQ=%d MaxFrameSize=%u\n",
3777                 info->device_name,
3778                 info->phys_sca_base,
3779                 info->phys_memory_base,
3780                 info->phys_statctrl_base,
3781                 info->phys_lcr_base,
3782                 info->irq_level,
3783                 info->max_frame_size );
3784
3785 #if SYNCLINK_GENERIC_HDLC
3786         hdlcdev_init(info);
3787 #endif
3788 }
3789
3790 /* Allocate and initialize a device instance structure
3791  *
3792  * Return Value:        pointer to SLMP_INFO if success, otherwise NULL
3793  */
3794 static SLMP_INFO *alloc_dev(int adapter_num, int port_num, struct pci_dev *pdev)
3795 {
3796         SLMP_INFO *info;
3797
3798         info = kmalloc(sizeof(SLMP_INFO),
3799                  GFP_KERNEL);
3800
3801         if (!info) {
3802                 printk("%s(%d) Error can't allocate device instance data for adapter %d, port %d\n",
3803                         __FILE__,__LINE__, adapter_num, port_num);
3804         } else {
3805                 memset(info, 0, sizeof(SLMP_INFO));
3806                 info->magic = MGSL_MAGIC;
3807                 INIT_WORK(&info->task, bh_handler);
3808                 info->max_frame_size = 4096;
3809                 info->close_delay = 5*HZ/10;
3810                 info->closing_wait = 30*HZ;
3811                 init_waitqueue_head(&info->open_wait);
3812                 init_waitqueue_head(&info->close_wait);
3813                 init_waitqueue_head(&info->status_event_wait_q);
3814                 init_waitqueue_head(&info->event_wait_q);
3815                 spin_lock_init(&info->netlock);
3816                 memcpy(&info->params,&default_params,sizeof(MGSL_PARAMS));
3817                 info->idle_mode = HDLC_TXIDLE_FLAGS;
3818                 info->adapter_num = adapter_num;
3819                 info->port_num = port_num;
3820
3821                 /* Copy configuration info to device instance data */
3822                 info->irq_level = pdev->irq;
3823                 info->phys_lcr_base = pci_resource_start(pdev,0);
3824                 info->phys_sca_base = pci_resource_start(pdev,2);
3825                 info->phys_memory_base = pci_resource_start(pdev,3);
3826                 info->phys_statctrl_base = pci_resource_start(pdev,4);
3827
3828                 /* Because veremap only works on page boundaries we must map
3829                  * a larger area than is actually implemented for the LCR
3830                  * memory range. We map a full page starting at the page boundary.
3831                  */
3832                 info->lcr_offset    = info->phys_lcr_base & (PAGE_SIZE-1);
3833                 info->phys_lcr_base &= ~(PAGE_SIZE-1);
3834
3835                 info->sca_offset    = info->phys_sca_base & (PAGE_SIZE-1);
3836                 info->phys_sca_base &= ~(PAGE_SIZE-1);
3837
3838                 info->statctrl_offset    = info->phys_statctrl_base & (PAGE_SIZE-1);
3839                 info->phys_statctrl_base &= ~(PAGE_SIZE-1);
3840
3841                 info->bus_type = MGSL_BUS_TYPE_PCI;
3842                 info->irq_flags = IRQF_SHARED;
3843
3844                 init_timer(&info->tx_timer);
3845                 info->tx_timer.data = (unsigned long)info;
3846                 info->tx_timer.function = tx_timeout;
3847
3848                 init_timer(&info->status_timer);
3849                 info->status_timer.data = (unsigned long)info;
3850                 info->status_timer.function = status_timeout;
3851
3852                 /* Store the PCI9050 misc control register value because a flaw
3853                  * in the PCI9050 prevents LCR registers from being read if
3854                  * BIOS assigns an LCR base address with bit 7 set.
3855                  *
3856                  * Only the misc control register is accessed for which only
3857                  * write access is needed, so set an initial value and change
3858                  * bits to the device instance data as we write the value
3859                  * to the actual misc control register.
3860                  */
3861                 info->misc_ctrl_value = 0x087e4546;
3862
3863                 /* initial port state is unknown - if startup errors
3864                  * occur, init_error will be set to indicate the
3865                  * problem. Once the port is fully initialized,
3866                  * this value will be set to 0 to indicate the
3867                  * port is available.
3868                  */
3869                 info->init_error = -1;
3870         }
3871
3872         return info;
3873 }
3874
3875 void device_init(int adapter_num, struct pci_dev *pdev)
3876 {
3877         SLMP_INFO *port_array[SCA_MAX_PORTS];
3878         int port;
3879
3880         /* allocate device instances for up to SCA_MAX_PORTS devices */
3881         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3882                 port_array[port] = alloc_dev(adapter_num,port,pdev);
3883                 if( port_array[port] == NULL ) {
3884                         for ( --port; port >= 0; --port )
3885                                 kfree(port_array[port]);
3886                         return;
3887                 }
3888         }
3889
3890         /* give copy of port_array to all ports and add to device list  */
3891         for ( port = 0; port < SCA_MAX_PORTS; ++port ) {
3892                 memcpy(port_array[port]->port_array,port_array,sizeof(port_array));
3893                 add_device( port_array[port] );
3894                 spin_lock_init(&port_array[port]->lock);
3895         }
3896
3897         /* Allocate and claim adapter resources */
3898         if ( !claim_resources(port_array[0]) ) {
3899
3900                 alloc_dma_bufs(port_array[0]);
3901
3902                 /* copy resource information from first port to others */
3903                 for ( port = 1; port < SCA_MAX_PORTS; ++port ) {
3904                         port_array[port]->lock  = port_array[0]->lock;
3905                         port_array[port]->irq_level     = port_array[0]->irq_level;
3906                         port_array[port]->memory_base   = port_array[0]->memory_base;
3907                         port_array[port]->sca_base      = port_array[0]->sca_base;
3908                         port_array[port]->statctrl_base = port_array[0]->statctrl_base;
3909                         port_array[port]->lcr_base      = port_array[0]->lcr_base;
3910                         alloc_dma_bufs(port_array[port]);
3911                 }
3912
3913                 if ( request_irq(port_array[0]->irq_level,
3914                                         synclinkmp_interrupt,
3915                                         port_array[0]->irq_flags,
3916                                         port_array[0]->device_name,
3917                                         port_array[0]) < 0 ) {
3918                         printk( "%s(%d):%s Cant request interrupt, IRQ=%d\n",
3919                                 __FILE__,__LINE__,
3920                                 port_array[0]->device_name,
3921                                 port_array[0]->irq_level );
3922                 }
3923                 else {
3924                         port_array[0]->irq_requested = 1;
3925                         adapter_test(port_array[0]);
3926                 }
3927         }
3928 }
3929
3930 static const struct tty_operations ops = {
3931         .open = open,
3932         .close = close,
3933         .write = write,
3934         .put_char = put_char,
3935         .flush_chars = flush_chars,
3936         .write_room = write_room,
3937         .chars_in_buffer = chars_in_buffer,
3938         .flush_buffer = flush_buffer,
3939         .ioctl = ioctl,
3940         .throttle = throttle,
3941         .unthrottle = unthrottle,
3942         .send_xchar = send_xchar,
3943         .break_ctl = set_break,
3944         .wait_until_sent = wait_until_sent,
3945         .read_proc = read_proc,
3946         .set_termios = set_termios,
3947         .stop = tx_hold,
3948         .start = tx_release,
3949         .hangup = hangup,
3950         .tiocmget = tiocmget,
3951         .tiocmset = tiocmset,
3952 };
3953
3954 static void synclinkmp_cleanup(void)
3955 {
3956         int rc;
3957         SLMP_INFO *info;
3958         SLMP_INFO *tmp;
3959
3960         printk("Unloading %s %s\n", driver_name, driver_version);
3961
3962         if (serial_driver) {
3963                 if ((rc = tty_unregister_driver(serial_driver)))
3964                         printk("%s(%d) failed to unregister tty driver err=%d\n",
3965                                __FILE__,__LINE__,rc);
3966                 put_tty_driver(serial_driver);
3967         }
3968
3969         /* reset devices */
3970         info = synclinkmp_device_list;
3971         while(info) {
3972                 reset_port(info);
3973                 info = info->next_device;
3974         }
3975
3976         /* release devices */
3977         info = synclinkmp_device_list;
3978         while(info) {
3979 #if SYNCLINK_GENERIC_HDLC
3980                 hdlcdev_exit(info);
3981 #endif
3982                 free_dma_bufs(info);
3983                 free_tmp_rx_buf(info);
3984                 if ( info->port_num == 0 ) {
3985                         if (info->sca_base)
3986                                 write_reg(info, LPR, 1); /* set low power mode */
3987                         release_resources(info);
3988                 }
3989                 tmp = info;
3990                 info = info->next_device;
3991                 kfree(tmp);
3992         }
3993
3994         pci_unregister_driver(&synclinkmp_pci_driver);
3995 }
3996
3997 /* Driver initialization entry point.
3998  */
3999
4000 static int __init synclinkmp_init(void)
4001 {
4002         int rc;
4003
4004         if (break_on_load) {
4005                 synclinkmp_get_text_ptr();
4006                 BREAKPOINT();
4007         }
4008
4009         printk("%s %s\n", driver_name, driver_version);
4010
4011         if ((rc = pci_register_driver(&synclinkmp_pci_driver)) < 0) {
4012                 printk("%s:failed to register PCI driver, error=%d\n",__FILE__,rc);
4013                 return rc;
4014         }
4015
4016         serial_driver = alloc_tty_driver(128);
4017         if (!serial_driver) {
4018                 rc = -ENOMEM;
4019                 goto error;
4020         }
4021
4022         /* Initialize the tty_driver structure */
4023
4024         serial_driver->owner = THIS_MODULE;
4025         serial_driver->driver_name = "synclinkmp";
4026         serial_driver->name = "ttySLM";
4027         serial_driver->major = ttymajor;
4028         serial_driver->minor_start = 64;
4029         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
4030         serial_driver->subtype = SERIAL_TYPE_NORMAL;
4031         serial_driver->init_termios = tty_std_termios;
4032         serial_driver->init_termios.c_cflag =
4033                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
4034         serial_driver->init_termios.c_ispeed = 9600;
4035         serial_driver->init_termios.c_ospeed = 9600;
4036         serial_driver->flags = TTY_DRIVER_REAL_RAW;
4037         tty_set_operations(serial_driver, &ops);
4038         if ((rc = tty_register_driver(serial_driver)) < 0) {
4039                 printk("%s(%d):Couldn't register serial driver\n",
4040                         __FILE__,__LINE__);
4041                 put_tty_driver(serial_driver);
4042                 serial_driver = NULL;
4043                 goto error;
4044         }
4045
4046         printk("%s %s, tty major#%d\n",
4047                 driver_name, driver_version,
4048                 serial_driver->major);
4049
4050         return 0;
4051
4052 error:
4053         synclinkmp_cleanup();
4054         return rc;
4055 }
4056
4057 static void __exit synclinkmp_exit(void)
4058 {
4059         synclinkmp_cleanup();
4060 }
4061
4062 module_init(synclinkmp_init);
4063 module_exit(synclinkmp_exit);
4064
4065 /* Set the port for internal loopback mode.
4066  * The TxCLK and RxCLK signals are generated from the BRG and
4067  * the TxD is looped back to the RxD internally.
4068  */
4069 void enable_loopback(SLMP_INFO *info, int enable)
4070 {
4071         if (enable) {
4072                 /* MD2 (Mode Register 2)
4073                  * 01..00  CNCT<1..0> Channel Connection 11=Local Loopback
4074                  */
4075                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) | (BIT1 + BIT0)));
4076
4077                 /* degate external TxC clock source */
4078                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4079                 write_control_reg(info);
4080
4081                 /* RXS/TXS (Rx/Tx clock source)
4082                  * 07      Reserved, must be 0
4083                  * 06..04  Clock Source, 100=BRG
4084                  * 03..00  Clock Divisor, 0000=1
4085                  */
4086                 write_reg(info, RXS, 0x40);
4087                 write_reg(info, TXS, 0x40);
4088
4089         } else {
4090                 /* MD2 (Mode Register 2)
4091                  * 01..00  CNCT<1..0> Channel connection, 0=normal
4092                  */
4093                 write_reg(info, MD2, (unsigned char)(read_reg(info, MD2) & ~(BIT1 + BIT0)));
4094
4095                 /* RXS/TXS (Rx/Tx clock source)
4096                  * 07      Reserved, must be 0
4097                  * 06..04  Clock Source, 000=RxC/TxC Pin
4098                  * 03..00  Clock Divisor, 0000=1
4099                  */
4100                 write_reg(info, RXS, 0x00);
4101                 write_reg(info, TXS, 0x00);
4102         }
4103
4104         /* set LinkSpeed if available, otherwise default to 2Mbps */
4105         if (info->params.clock_speed)
4106                 set_rate(info, info->params.clock_speed);
4107         else
4108                 set_rate(info, 3686400);
4109 }
4110
4111 /* Set the baud rate register to the desired speed
4112  *
4113  *      data_rate       data rate of clock in bits per second
4114  *                      A data rate of 0 disables the AUX clock.
4115  */
4116 void set_rate( SLMP_INFO *info, u32 data_rate )
4117 {
4118         u32 TMCValue;
4119         unsigned char BRValue;
4120         u32 Divisor=0;
4121
4122         /* fBRG = fCLK/(TMC * 2^BR)
4123          */
4124         if (data_rate != 0) {
4125                 Divisor = 14745600/data_rate;
4126                 if (!Divisor)
4127                         Divisor = 1;
4128
4129                 TMCValue = Divisor;
4130
4131                 BRValue = 0;
4132                 if (TMCValue != 1 && TMCValue != 2) {
4133                         /* BRValue of 0 provides 50/50 duty cycle *only* when
4134                          * TMCValue is 1 or 2. BRValue of 1 to 9 always provides
4135                          * 50/50 duty cycle.
4136                          */
4137                         BRValue = 1;
4138                         TMCValue >>= 1;
4139                 }
4140
4141                 /* while TMCValue is too big for TMC register, divide
4142                  * by 2 and increment BR exponent.
4143                  */
4144                 for(; TMCValue > 256 && BRValue < 10; BRValue++)
4145                         TMCValue >>= 1;
4146
4147                 write_reg(info, TXS,
4148                         (unsigned char)((read_reg(info, TXS) & 0xf0) | BRValue));
4149                 write_reg(info, RXS,
4150                         (unsigned char)((read_reg(info, RXS) & 0xf0) | BRValue));
4151                 write_reg(info, TMC, (unsigned char)TMCValue);
4152         }
4153         else {
4154                 write_reg(info, TXS,0);
4155                 write_reg(info, RXS,0);
4156                 write_reg(info, TMC, 0);
4157         }
4158 }
4159
4160 /* Disable receiver
4161  */
4162 void rx_stop(SLMP_INFO *info)
4163 {
4164         if (debug_level >= DEBUG_LEVEL_ISR)
4165                 printk("%s(%d):%s rx_stop()\n",
4166                          __FILE__,__LINE__, info->device_name );
4167
4168         write_reg(info, CMD, RXRESET);
4169
4170         info->ie0_value &= ~RXRDYE;
4171         write_reg(info, IE0, info->ie0_value);  /* disable Rx data interrupts */
4172
4173         write_reg(info, RXDMA + DSR, 0);        /* disable Rx DMA */
4174         write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4175         write_reg(info, RXDMA + DIR, 0);        /* disable Rx DMA interrupts */
4176
4177         info->rx_enabled = 0;
4178         info->rx_overflow = 0;
4179 }
4180
4181 /* enable the receiver
4182  */
4183 void rx_start(SLMP_INFO *info)
4184 {
4185         int i;
4186
4187         if (debug_level >= DEBUG_LEVEL_ISR)
4188                 printk("%s(%d):%s rx_start()\n",
4189                          __FILE__,__LINE__, info->device_name );
4190
4191         write_reg(info, CMD, RXRESET);
4192
4193         if ( info->params.mode == MGSL_MODE_HDLC ) {
4194                 /* HDLC, disabe IRQ on rxdata */
4195                 info->ie0_value &= ~RXRDYE;
4196                 write_reg(info, IE0, info->ie0_value);
4197
4198                 /* Reset all Rx DMA buffers and program rx dma */
4199                 write_reg(info, RXDMA + DSR, 0);                /* disable Rx DMA */
4200                 write_reg(info, RXDMA + DCMD, SWABORT); /* reset/init Rx DMA */
4201
4202                 for (i = 0; i < info->rx_buf_count; i++) {
4203                         info->rx_buf_list[i].status = 0xff;
4204
4205                         // throttle to 4 shared memory writes at a time to prevent
4206                         // hogging local bus (keep latency time for DMA requests low).
4207                         if (!(i % 4))
4208                                 read_status_reg(info);
4209                 }
4210                 info->current_rx_buf = 0;
4211
4212                 /* set current/1st descriptor address */
4213                 write_reg16(info, RXDMA + CDA,
4214                         info->rx_buf_list_ex[0].phys_entry);
4215
4216                 /* set new last rx descriptor address */
4217                 write_reg16(info, RXDMA + EDA,
4218                         info->rx_buf_list_ex[info->rx_buf_count - 1].phys_entry);
4219
4220                 /* set buffer length (shared by all rx dma data buffers) */
4221                 write_reg16(info, RXDMA + BFL, SCABUFSIZE);
4222
4223                 write_reg(info, RXDMA + DIR, 0x60);     /* enable Rx DMA interrupts (EOM/BOF) */
4224                 write_reg(info, RXDMA + DSR, 0xf2);     /* clear Rx DMA IRQs, enable Rx DMA */
4225         } else {
4226                 /* async, enable IRQ on rxdata */
4227                 info->ie0_value |= RXRDYE;
4228                 write_reg(info, IE0, info->ie0_value);
4229         }
4230
4231         write_reg(info, CMD, RXENABLE);
4232
4233         info->rx_overflow = FALSE;
4234         info->rx_enabled = 1;
4235 }
4236
4237 /* Enable the transmitter and send a transmit frame if
4238  * one is loaded in the DMA buffers.
4239  */
4240 void tx_start(SLMP_INFO *info)
4241 {
4242         if (debug_level >= DEBUG_LEVEL_ISR)
4243                 printk("%s(%d):%s tx_start() tx_count=%d\n",
4244                          __FILE__,__LINE__, info->device_name,info->tx_count );
4245
4246         if (!info->tx_enabled ) {
4247                 write_reg(info, CMD, TXRESET);
4248                 write_reg(info, CMD, TXENABLE);
4249                 info->tx_enabled = TRUE;
4250         }
4251
4252         if ( info->tx_count ) {
4253
4254                 /* If auto RTS enabled and RTS is inactive, then assert */
4255                 /* RTS and set a flag indicating that the driver should */
4256                 /* negate RTS when the transmission completes. */
4257
4258                 info->drop_rts_on_tx_done = 0;
4259
4260                 if (info->params.mode != MGSL_MODE_ASYNC) {
4261
4262                         if ( info->params.flags & HDLC_FLAG_AUTO_RTS ) {
4263                                 get_signals( info );
4264                                 if ( !(info->serial_signals & SerialSignal_RTS) ) {
4265                                         info->serial_signals |= SerialSignal_RTS;
4266                                         set_signals( info );
4267                                         info->drop_rts_on_tx_done = 1;
4268                                 }
4269                         }
4270
4271                         write_reg16(info, TRC0,
4272                                 (unsigned short)(((tx_negate_fifo_level-1)<<8) + tx_active_fifo_level));
4273
4274                         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4275                         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4276
4277                         /* set TX CDA (current descriptor address) */
4278                         write_reg16(info, TXDMA + CDA,
4279                                 info->tx_buf_list_ex[0].phys_entry);
4280
4281                         /* set TX EDA (last descriptor address) */
4282                         write_reg16(info, TXDMA + EDA,
4283                                 info->tx_buf_list_ex[info->last_tx_buf].phys_entry);
4284
4285                         /* enable underrun IRQ */
4286                         info->ie1_value &= ~IDLE;
4287                         info->ie1_value |= UDRN;
4288                         write_reg(info, IE1, info->ie1_value);
4289                         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));
4290
4291                         write_reg(info, TXDMA + DIR, 0x40);             /* enable Tx DMA interrupts (EOM) */
4292                         write_reg(info, TXDMA + DSR, 0xf2);             /* clear Tx DMA IRQs, enable Tx DMA */
4293
4294                         info->tx_timer.expires = jiffies + msecs_to_jiffies(5000);
4295                         add_timer(&info->tx_timer);
4296                 }
4297                 else {
4298                         tx_load_fifo(info);
4299                         /* async, enable IRQ on txdata */
4300                         info->ie0_value |= TXRDYE;
4301                         write_reg(info, IE0, info->ie0_value);
4302                 }
4303
4304                 info->tx_active = 1;
4305         }
4306 }
4307
4308 /* stop the transmitter and DMA
4309  */
4310 void tx_stop( SLMP_INFO *info )
4311 {
4312         if (debug_level >= DEBUG_LEVEL_ISR)
4313                 printk("%s(%d):%s tx_stop()\n",
4314                          __FILE__,__LINE__, info->device_name );
4315
4316         del_timer(&info->tx_timer);
4317
4318         write_reg(info, TXDMA + DSR, 0);                /* disable DMA channel */
4319         write_reg(info, TXDMA + DCMD, SWABORT); /* reset/init DMA channel */
4320
4321         write_reg(info, CMD, TXRESET);
4322
4323         info->ie1_value &= ~(UDRN + IDLE);
4324         write_reg(info, IE1, info->ie1_value);  /* disable tx status interrupts */
4325         write_reg(info, SR1, (unsigned char)(IDLE + UDRN));     /* clear pending */
4326
4327         info->ie0_value &= ~TXRDYE;
4328         write_reg(info, IE0, info->ie0_value);  /* disable tx data interrupts */
4329
4330         info->tx_enabled = 0;
4331         info->tx_active  = 0;
4332 }
4333
4334 /* Fill the transmit FIFO until the FIFO is full or
4335  * there is no more data to load.
4336  */
4337 void tx_load_fifo(SLMP_INFO *info)
4338 {
4339         u8 TwoBytes[2];
4340
4341         /* do nothing is now tx data available and no XON/XOFF pending */
4342
4343         if ( !info->tx_count && !info->x_char )
4344                 return;
4345
4346         /* load the Transmit FIFO until FIFOs full or all data sent */
4347
4348         while( info->tx_count && (read_reg(info,SR0) & BIT1) ) {
4349
4350                 /* there is more space in the transmit FIFO and */
4351                 /* there is more data in transmit buffer */
4352
4353                 if ( (info->tx_count > 1) && !info->x_char ) {
4354                         /* write 16-bits */
4355                         TwoBytes[0] = info->tx_buf[info->tx_get++];
4356                         if (info->tx_get >= info->max_frame_size)
4357                                 info->tx_get -= info->max_frame_size;
4358                         TwoBytes[1] = info->tx_buf[info->tx_get++];
4359                         if (info->tx_get >= info->max_frame_size)
4360                                 info->tx_get -= info->max_frame_size;
4361
4362                         write_reg16(info, TRB, *((u16 *)TwoBytes));
4363
4364                         info->tx_count -= 2;
4365                         info->icount.tx += 2;
4366                 } else {
4367                         /* only 1 byte left to transmit or 1 FIFO slot left */
4368
4369                         if (info->x_char) {
4370                                 /* transmit pending high priority char */
4371                                 write_reg(info, TRB, info->x_char);
4372                                 info->x_char = 0;
4373                         } else {
4374                                 write_reg(info, TRB, info->tx_buf[info->tx_get++]);
4375                                 if (info->tx_get >= info->max_frame_size)
4376                                         info->tx_get -= info->max_frame_size;
4377                                 info->tx_count--;
4378                         }
4379                         info->icount.tx++;
4380                 }
4381         }
4382 }
4383
4384 /* Reset a port to a known state
4385  */
4386 void reset_port(SLMP_INFO *info)
4387 {
4388         if (info->sca_base) {
4389
4390                 tx_stop(info);
4391                 rx_stop(info);
4392
4393                 info->serial_signals &= ~(SerialSignal_DTR + SerialSignal_RTS);
4394                 set_signals(info);
4395
4396                 /* disable all port interrupts */
4397                 info->ie0_value = 0;
4398                 info->ie1_value = 0;
4399                 info->ie2_value = 0;
4400                 write_reg(info, IE0, info->ie0_value);
4401                 write_reg(info, IE1, info->ie1_value);
4402                 write_reg(info, IE2, info->ie2_value);
4403
4404                 write_reg(info, CMD, CHRESET);
4405         }
4406 }
4407
4408 /* Reset all the ports to a known state.
4409  */
4410 void reset_adapter(SLMP_INFO *info)
4411 {
4412         int i;
4413
4414         for ( i=0; i < SCA_MAX_PORTS; ++i) {
4415                 if (info->port_array[i])
4416                         reset_port(info->port_array[i]);
4417         }
4418 }
4419
4420 /* Program port for asynchronous communications.
4421  */
4422 void async_mode(SLMP_INFO *info)
4423 {
4424
4425         unsigned char RegValue;
4426
4427         tx_stop(info);
4428         rx_stop(info);
4429
4430         /* MD0, Mode Register 0
4431          *
4432          * 07..05  PRCTL<2..0>, Protocol Mode, 000=async
4433          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4434          * 03      Reserved, must be 0
4435          * 02      CRCCC, CRC Calculation, 0=disabled
4436          * 01..00  STOP<1..0> Stop bits (00=1,10=2)
4437          *
4438          * 0000 0000
4439          */
4440         RegValue = 0x00;
4441         if (info->params.stop_bits != 1)
4442                 RegValue |= BIT1;
4443         write_reg(info, MD0, RegValue);
4444
4445         /* MD1, Mode Register 1
4446          *
4447          * 07..06  BRATE<1..0>, bit rate, 00=1/1 01=1/16 10=1/32 11=1/64
4448          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits,01=7,10=6,11=5
4449          * 03..02  RXCHR<1..0>, rx char size
4450          * 01..00  PMPM<1..0>, Parity mode, 00=none 10=even 11=odd
4451          *
4452          * 0100 0000
4453          */
4454         RegValue = 0x40;
4455         switch (info->params.data_bits) {
4456         case 7: RegValue |= BIT4 + BIT2; break;
4457         case 6: RegValue |= BIT5 + BIT3; break;
4458         case 5: RegValue |= BIT5 + BIT4 + BIT3 + BIT2; break;
4459         }
4460         if (info->params.parity != ASYNC_PARITY_NONE) {
4461                 RegValue |= BIT1;
4462                 if (info->params.parity == ASYNC_PARITY_ODD)
4463                         RegValue |= BIT0;
4464         }
4465         write_reg(info, MD1, RegValue);
4466
4467         /* MD2, Mode Register 2
4468          *
4469          * 07..02  Reserved, must be 0
4470          * 01..00  CNCT<1..0> Channel connection, 00=normal 11=local loopback
4471          *
4472          * 0000 0000
4473          */
4474         RegValue = 0x00;
4475         if (info->params.loopback)
4476                 RegValue |= (BIT1 + BIT0);
4477         write_reg(info, MD2, RegValue);
4478
4479         /* RXS, Receive clock source
4480          *
4481          * 07      Reserved, must be 0
4482          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4483          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4484          */
4485         RegValue=BIT6;
4486         write_reg(info, RXS, RegValue);
4487
4488         /* TXS, Transmit clock source
4489          *
4490          * 07      Reserved, must be 0
4491          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4492          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4493          */
4494         RegValue=BIT6;
4495         write_reg(info, TXS, RegValue);
4496
4497         /* Control Register
4498          *
4499          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4500          */
4501         info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4502         write_control_reg(info);
4503
4504         tx_set_idle(info);
4505
4506         /* RRC Receive Ready Control 0
4507          *
4508          * 07..05  Reserved, must be 0
4509          * 04..00  RRC<4..0> Rx FIFO trigger active 0x00 = 1 byte
4510          */
4511         write_reg(info, RRC, 0x00);
4512
4513         /* TRC0 Transmit Ready Control 0
4514          *
4515          * 07..05  Reserved, must be 0
4516          * 04..00  TRC<4..0> Tx FIFO trigger active 0x10 = 16 bytes
4517          */
4518         write_reg(info, TRC0, 0x10);
4519
4520         /* TRC1 Transmit Ready Control 1
4521          *
4522          * 07..05  Reserved, must be 0
4523          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1e = 31 bytes (full-1)
4524          */
4525         write_reg(info, TRC1, 0x1e);
4526
4527         /* CTL, MSCI control register
4528          *
4529          * 07..06  Reserved, set to 0
4530          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4531          * 04      IDLC, idle control, 0=mark 1=idle register
4532          * 03      BRK, break, 0=off 1 =on (async)
4533          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4534          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4535          * 00      RTS, RTS output control, 0=active 1=inactive
4536          *
4537          * 0001 0001
4538          */
4539         RegValue = 0x10;
4540         if (!(info->serial_signals & SerialSignal_RTS))
4541                 RegValue |= 0x01;
4542         write_reg(info, CTL, RegValue);
4543
4544         /* enable status interrupts */
4545         info->ie0_value |= TXINTE + RXINTE;
4546         write_reg(info, IE0, info->ie0_value);
4547
4548         /* enable break detect interrupt */
4549         info->ie1_value = BRKD;
4550         write_reg(info, IE1, info->ie1_value);
4551
4552         /* enable rx overrun interrupt */
4553         info->ie2_value = OVRN;
4554         write_reg(info, IE2, info->ie2_value);
4555
4556         set_rate( info, info->params.data_rate * 16 );
4557 }
4558
4559 /* Program the SCA for HDLC communications.
4560  */
4561 void hdlc_mode(SLMP_INFO *info)
4562 {
4563         unsigned char RegValue;
4564         u32 DpllDivisor;
4565
4566         // Can't use DPLL because SCA outputs recovered clock on RxC when
4567         // DPLL mode selected. This causes output contention with RxC receiver.
4568         // Use of DPLL would require external hardware to disable RxC receiver
4569         // when DPLL mode selected.
4570         info->params.flags &= ~(HDLC_FLAG_TXC_DPLL + HDLC_FLAG_RXC_DPLL);
4571
4572         /* disable DMA interrupts */
4573         write_reg(info, TXDMA + DIR, 0);
4574         write_reg(info, RXDMA + DIR, 0);
4575
4576         /* MD0, Mode Register 0
4577          *
4578          * 07..05  PRCTL<2..0>, Protocol Mode, 100=HDLC
4579          * 04      AUTO, Auto-enable (RTS/CTS/DCD)
4580          * 03      Reserved, must be 0
4581          * 02      CRCCC, CRC Calculation, 1=enabled
4582          * 01      CRC1, CRC selection, 0=CRC-16,1=CRC-CCITT-16
4583          * 00      CRC0, CRC initial value, 1 = all 1s
4584          *
4585          * 1000 0001
4586          */
4587         RegValue = 0x81;
4588         if (info->params.flags & HDLC_FLAG_AUTO_CTS)
4589                 RegValue |= BIT4;
4590         if (info->params.flags & HDLC_FLAG_AUTO_DCD)
4591                 RegValue |= BIT4;
4592         if (info->params.crc_type == HDLC_CRC_16_CCITT)
4593                 RegValue |= BIT2 + BIT1;
4594         write_reg(info, MD0, RegValue);
4595
4596         /* MD1, Mode Register 1
4597          *
4598          * 07..06  ADDRS<1..0>, Address detect, 00=no addr check
4599          * 05..04  TXCHR<1..0>, tx char size, 00=8 bits
4600          * 03..02  RXCHR<1..0>, rx char size, 00=8 bits
4601          * 01..00  PMPM<1..0>, Parity mode, 00=no parity
4602          *
4603          * 0000 0000
4604          */
4605         RegValue = 0x00;
4606         write_reg(info, MD1, RegValue);
4607
4608         /* MD2, Mode Register 2
4609          *
4610          * 07      NRZFM, 0=NRZ, 1=FM
4611          * 06..05  CODE<1..0> Encoding, 00=NRZ
4612          * 04..03  DRATE<1..0> DPLL Divisor, 00=8
4613          * 02      Reserved, must be 0
4614          * 01..00  CNCT<1..0> Channel connection, 0=normal
4615          *
4616          * 0000 0000
4617          */
4618         RegValue = 0x00;
4619         switch(info->params.encoding) {
4620         case HDLC_ENCODING_NRZI:          RegValue |= BIT5; break;
4621         case HDLC_ENCODING_BIPHASE_MARK:  RegValue |= BIT7 + BIT5; break; /* aka FM1 */
4622         case HDLC_ENCODING_BIPHASE_SPACE: RegValue |= BIT7 + BIT6; break; /* aka FM0 */
4623         case HDLC_ENCODING_BIPHASE_LEVEL: RegValue |= BIT7; break;      /* aka Manchester */
4624 #if 0
4625         case HDLC_ENCODING_NRZB:                                        /* not supported */
4626         case HDLC_ENCODING_NRZI_MARK:                                   /* not supported */
4627         case HDLC_ENCODING_DIFF_BIPHASE_LEVEL:                          /* not supported */
4628 #endif
4629         }
4630         if ( info->params.flags & HDLC_FLAG_DPLL_DIV16 ) {
4631                 DpllDivisor = 16;
4632                 RegValue |= BIT3;
4633         } else if ( info->params.flags & HDLC_FLAG_DPLL_DIV8 ) {
4634                 DpllDivisor = 8;
4635         } else {
4636                 DpllDivisor = 32;
4637                 RegValue |= BIT4;
4638         }
4639         write_reg(info, MD2, RegValue);
4640
4641
4642         /* RXS, Receive clock source
4643          *
4644          * 07      Reserved, must be 0
4645          * 06..04  RXCS<2..0>, clock source, 000=RxC Pin, 100=BRG, 110=DPLL
4646          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4647          */
4648         RegValue=0;
4649         if (info->params.flags & HDLC_FLAG_RXC_BRG)
4650                 RegValue |= BIT6;
4651         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4652                 RegValue |= BIT6 + BIT5;
4653         write_reg(info, RXS, RegValue);
4654
4655         /* TXS, Transmit clock source
4656          *
4657          * 07      Reserved, must be 0
4658          * 06..04  RXCS<2..0>, clock source, 000=TxC Pin, 100=BRG, 110=Receive Clock
4659          * 03..00  RXBR<3..0>, rate divisor, 0000=1
4660          */
4661         RegValue=0;
4662         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4663                 RegValue |= BIT6;
4664         if (info->params.flags & HDLC_FLAG_TXC_DPLL)
4665                 RegValue |= BIT6 + BIT5;
4666         write_reg(info, TXS, RegValue);
4667
4668         if (info->params.flags & HDLC_FLAG_RXC_DPLL)
4669                 set_rate(info, info->params.clock_speed * DpllDivisor);
4670         else
4671                 set_rate(info, info->params.clock_speed);
4672
4673         /* GPDATA (General Purpose I/O Data Register)
4674          *
4675          * 6,4,2,0  CLKSEL<3..0>, 0 = TcCLK in, 1 = Auxclk out
4676          */
4677         if (info->params.flags & HDLC_FLAG_TXC_BRG)
4678                 info->port_array[0]->ctrlreg_value |= (BIT0 << (info->port_num * 2));
4679         else
4680                 info->port_array[0]->ctrlreg_value &= ~(BIT0 << (info->port_num * 2));
4681         write_control_reg(info);
4682
4683         /* RRC Receive Ready Control 0
4684          *
4685          * 07..05  Reserved, must be 0
4686          * 04..00  RRC<4..0> Rx FIFO trigger active
4687          */
4688         write_reg(info, RRC, rx_active_fifo_level);
4689
4690         /* TRC0 Transmit Ready Control 0
4691          *
4692          * 07..05  Reserved, must be 0
4693          * 04..00  TRC<4..0> Tx FIFO trigger active
4694          */
4695         write_reg(info, TRC0, tx_active_fifo_level);
4696
4697         /* TRC1 Transmit Ready Control 1
4698          *
4699          * 07..05  Reserved, must be 0
4700          * 04..00  TRC<4..0> Tx FIFO trigger inactive 0x1f = 32 bytes (full)
4701          */
4702         write_reg(info, TRC1, (unsigned char)(tx_negate_fifo_level - 1));
4703
4704         /* DMR, DMA Mode Register
4705          *
4706          * 07..05  Reserved, must be 0
4707          * 04      TMOD, Transfer Mode: 1=chained-block
4708          * 03      Reserved, must be 0
4709          * 02      NF, Number of Frames: 1=multi-frame
4710          * 01      CNTE, Frame End IRQ Counter enable: 0=disabled
4711          * 00      Reserved, must be 0
4712          *
4713          * 0001 0100
4714          */
4715         write_reg(info, TXDMA + DMR, 0x14);
4716         write_reg(info, RXDMA + DMR, 0x14);
4717
4718         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4719         write_reg(info, RXDMA + CPB,
4720                 (unsigned char)(info->buffer_list_phys >> 16));
4721
4722         /* Set chain pointer base (upper 8 bits of 24 bit addr) */
4723         write_reg(info, TXDMA + CPB,
4724                 (unsigned char)(info->buffer_list_phys >> 16));
4725
4726         /* enable status interrupts. other code enables/disables
4727          * the individual sources for these two interrupt classes.
4728          */
4729         info->ie0_value |= TXINTE + RXINTE;
4730         write_reg(info, IE0, info->ie0_value);
4731
4732         /* CTL, MSCI control register
4733          *
4734          * 07..06  Reserved, set to 0
4735          * 05      UDRNC, underrun control, 0=abort 1=CRC+flag (HDLC/BSC)
4736          * 04      IDLC, idle control, 0=mark 1=idle register
4737          * 03      BRK, break, 0=off 1 =on (async)
4738          * 02      SYNCLD, sync char load enable (BSC) 1=enabled
4739          * 01      GOP, go active on poll (LOOP mode) 1=enabled
4740          * 00      RTS, RTS output control, 0=active 1=inactive
4741          *
4742          * 0001 0001
4743          */
4744         RegValue = 0x10;
4745         if (!(info->serial_signals & SerialSignal_RTS))
4746                 RegValue |= 0x01;
4747         write_reg(info, CTL, RegValue);
4748
4749         /* preamble not supported ! */
4750
4751         tx_set_idle(info);
4752         tx_stop(info);
4753         rx_stop(info);
4754
4755         set_rate(info, info->params.clock_speed);
4756
4757         if (info->params.loopback)
4758                 enable_loopback(info,1);
4759 }
4760
4761 /* Set the transmit HDLC idle mode
4762  */
4763 void tx_set_idle(SLMP_INFO *info)
4764 {
4765         unsigned char RegValue = 0xff;
4766
4767         /* Map API idle mode to SCA register bits */
4768         switch(info->idle_mode) {
4769         case HDLC_TXIDLE_FLAGS:                 RegValue = 0x7e; break;
4770         case HDLC_TXIDLE_ALT_ZEROS_ONES:        RegValue = 0xaa; break;
4771         case HDLC_TXIDLE_ZEROS:                 RegValue = 0x00; break;
4772         case HDLC_TXIDLE_ONES:                  RegValue = 0xff; break;
4773         case HDLC_TXIDLE_ALT_MARK_SPACE:        RegValue = 0xaa; break;
4774         case HDLC_TXIDLE_SPACE:                 RegValue = 0x00; break;
4775         case HDLC_TXIDLE_MARK:                  RegValue = 0xff; break;
4776         }
4777
4778         write_reg(info, IDL, RegValue);
4779 }
4780
4781 /* Query the adapter for the state of the V24 status (input) signals.
4782  */
4783 void get_signals(SLMP_INFO *info)
4784 {
4785         u16 status = read_reg(info, SR3);
4786         u16 gpstatus = read_status_reg(info);
4787         u16 testbit;
4788
4789         /* clear all serial signals except DTR and RTS */
4790         info->serial_signals &= SerialSignal_DTR + SerialSignal_RTS;
4791
4792         /* set serial signal bits to reflect MISR */
4793
4794         if (!(status & BIT3))
4795                 info->serial_signals |= SerialSignal_CTS;
4796
4797         if ( !(status & BIT2))
4798                 info->serial_signals |= SerialSignal_DCD;
4799
4800         testbit = BIT1 << (info->port_num * 2); // Port 0..3 RI is GPDATA<1,3,5,7>
4801         if (!(gpstatus & testbit))
4802                 info->serial_signals |= SerialSignal_RI;
4803
4804         testbit = BIT0 << (info->port_num * 2); // Port 0..3 DSR is GPDATA<0,2,4,6>
4805         if (!(gpstatus & testbit))
4806                 info->serial_signals |= SerialSignal_DSR;
4807 }
4808
4809 /* Set the state of DTR and RTS based on contents of
4810  * serial_signals member of device context.
4811  */
4812 void set_signals(SLMP_INFO *info)
4813 {
4814         unsigned char RegValue;
4815         u16 EnableBit;
4816
4817         RegValue = read_reg(info, CTL);
4818         if (info->serial_signals & SerialSignal_RTS)
4819                 RegValue &= ~BIT0;
4820         else
4821                 RegValue |= BIT0;
4822         write_reg(info, CTL, RegValue);
4823
4824         // Port 0..3 DTR is ctrl reg <1,3,5,7>
4825         EnableBit = BIT1 << (info->port_num*2);
4826         if (info->serial_signals & SerialSignal_DTR)
4827                 info->port_array[0]->ctrlreg_value &= ~EnableBit;
4828         else
4829                 info->port_array[0]->ctrlreg_value |= EnableBit;
4830         write_control_reg(info);
4831 }
4832
4833 /*******************/
4834 /* DMA Buffer Code */
4835 /*******************/
4836
4837 /* Set the count for all receive buffers to SCABUFSIZE
4838  * and set the current buffer to the first buffer. This effectively
4839  * makes all buffers free and discards any data in buffers.
4840  */
4841 void rx_reset_buffers(SLMP_INFO *info)
4842 {
4843         rx_free_frame_buffers(info, 0, info->rx_buf_count - 1);
4844 }
4845
4846 /* Free the buffers used by a received frame
4847  *
4848  * info   pointer to device instance data
4849  * first  index of 1st receive buffer of frame
4850  * last   index of last receive buffer of frame
4851  */
4852 void rx_free_frame_buffers(SLMP_INFO *info, unsigned int first, unsigned int last)
4853 {
4854         int done = 0;
4855
4856         while(!done) {
4857                 /* reset current buffer for reuse */
4858                 info->rx_buf_list[first].status = 0xff;
4859
4860                 if (first == last) {
4861                         done = 1;
4862                         /* set new last rx descriptor address */
4863                         write_reg16(info, RXDMA + EDA, info->rx_buf_list_ex[first].phys_entry);
4864                 }
4865
4866                 first++;
4867                 if (first == info->rx_buf_count)
4868                         first = 0;
4869         }
4870
4871         /* set current buffer to next buffer after last buffer of frame */
4872         info->current_rx_buf = first;
4873 }
4874
4875 /* Return a received frame from the receive DMA buffers.
4876  * Only frames received without errors are returned.
4877  *
4878  * Return Value:        1 if frame returned, otherwise 0
4879  */
4880 int rx_get_frame(SLMP_INFO *info)
4881 {
4882         unsigned int StartIndex, EndIndex;      /* index of 1st and last buffers of Rx frame */
4883         unsigned short status;
4884         unsigned int framesize = 0;
4885         int ReturnCode = 0;
4886         unsigned long flags;
4887         struct tty_struct *tty = info->tty;
4888         unsigned char addr_field = 0xff;
4889         SCADESC *desc;
4890         SCADESC_EX *desc_ex;
4891
4892 CheckAgain:
4893         /* assume no frame returned, set zero length */
4894         framesize = 0;
4895         addr_field = 0xff;
4896
4897         /*
4898          * current_rx_buf points to the 1st buffer of the next available
4899          * receive frame. To find the last buffer of the frame look for
4900          * a non-zero status field in the buffer entries. (The status
4901          * field is set by the 16C32 after completing a receive frame.
4902          */
4903         StartIndex = EndIndex = info->current_rx_buf;
4904
4905         for ( ;; ) {
4906                 desc = &info->rx_buf_list[EndIndex];
4907                 desc_ex = &info->rx_buf_list_ex[EndIndex];
4908
4909                 if (desc->status == 0xff)
4910                         goto Cleanup;   /* current desc still in use, no frames available */
4911
4912                 if (framesize == 0 && info->params.addr_filter != 0xff)
4913                         addr_field = desc_ex->virt_addr[0];
4914
4915                 framesize += desc->length;
4916
4917                 /* Status != 0 means last buffer of frame */
4918                 if (desc->status)
4919                         break;
4920
4921                 EndIndex++;
4922                 if (EndIndex == info->rx_buf_count)
4923                         EndIndex = 0;
4924
4925                 if (EndIndex == info->current_rx_buf) {
4926                         /* all buffers have been 'used' but none mark      */
4927                         /* the end of a frame. Reset buffers and receiver. */
4928                         if ( info->rx_enabled ){
4929                                 spin_lock_irqsave(&info->lock,flags);
4930                                 rx_start(info);
4931                                 spin_unlock_irqrestore(&info->lock,flags);
4932                         }
4933                         goto Cleanup;
4934                 }
4935
4936         }
4937
4938         /* check status of receive frame */
4939
4940         /* frame status is byte stored after frame data
4941          *
4942          * 7 EOM (end of msg), 1 = last buffer of frame
4943          * 6 Short Frame, 1 = short frame
4944          * 5 Abort, 1 = frame aborted
4945          * 4 Residue, 1 = last byte is partial
4946          * 3 Overrun, 1 = overrun occurred during frame reception
4947          * 2 CRC,     1 = CRC error detected
4948          *
4949          */
4950         status = desc->status;
4951
4952         /* ignore CRC bit if not using CRC (bit is undefined) */
4953         /* Note:CRC is not save to data buffer */
4954         if (info->params.crc_type == HDLC_CRC_NONE)
4955                 status &= ~BIT2;
4956
4957         if (framesize == 0 ||
4958                  (addr_field != 0xff && addr_field != info->params.addr_filter)) {
4959                 /* discard 0 byte frames, this seems to occur sometime
4960                  * when remote is idling flags.
4961                  */
4962                 rx_free_frame_buffers(info, StartIndex, EndIndex);
4963                 goto CheckAgain;
4964         }
4965
4966         if (framesize < 2)
4967                 status |= BIT6;
4968
4969         if (status & (BIT6+BIT5+BIT3+BIT2)) {
4970                 /* received frame has errors,
4971                  * update counts and mark frame size as 0
4972                  */
4973                 if (status & BIT6)
4974                         info->icount.rxshort++;
4975                 else if (status & BIT5)
4976                         info->icount.rxabort++;
4977                 else if (status & BIT3)
4978                         info->icount.rxover++;
4979                 else
4980                         info->icount.rxcrc++;
4981
4982                 framesize = 0;
4983 #if SYNCLINK_GENERIC_HDLC
4984                 {
4985                         struct net_device_stats *stats = hdlc_stats(info->netdev);
4986                         stats->rx_errors++;
4987                         stats->rx_frame_errors++;
4988                 }
4989 #endif
4990         }
4991
4992         if ( debug_level >= DEBUG_LEVEL_BH )
4993                 printk("%s(%d):%s rx_get_frame() status=%04X size=%d\n",
4994                         __FILE__,__LINE__,info->device_name,status,framesize);
4995
4996         if ( debug_level >= DEBUG_LEVEL_DATA )
4997                 trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
4998                         min_t(int, framesize,SCABUFSIZE),0);
4999
5000         if (framesize) {
5001                 if (framesize > info->max_frame_size)
5002                         info->icount.rxlong++;
5003                 else {
5004                         /* copy dma buffer(s) to contiguous intermediate buffer */
5005                         int copy_count = framesize;
5006                         int index = StartIndex;
5007                         unsigned char *ptmp = info->tmp_rx_buf;
5008                         info->tmp_rx_buf_count = framesize;
5009
5010                         info->icount.rxok++;
5011
5012                         while(copy_count) {
5013                                 int partial_count = min(copy_count,SCABUFSIZE);
5014                                 memcpy( ptmp,
5015                                         info->rx_buf_list_ex[index].virt_addr,
5016                                         partial_count );
5017                                 ptmp += partial_count;
5018                                 copy_count -= partial_count;
5019
5020                                 if ( ++index == info->rx_buf_count )
5021                                         index = 0;
5022                         }
5023
5024 #if SYNCLINK_GENERIC_HDLC
5025                         if (info->netcount)
5026                                 hdlcdev_rx(info,info->tmp_rx_buf,framesize);
5027                         else
5028 #endif
5029                                 ldisc_receive_buf(tty,info->tmp_rx_buf,
5030                                                   info->flag_buf, framesize);
5031                 }
5032         }
5033         /* Free the buffers used by this frame. */
5034         rx_free_frame_buffers( info, StartIndex, EndIndex );
5035
5036         ReturnCode = 1;
5037
5038 Cleanup:
5039         if ( info->rx_enabled && info->rx_overflow ) {
5040                 /* Receiver is enabled, but needs to restarted due to
5041                  * rx buffer overflow. If buffers are empty, restart receiver.
5042                  */
5043                 if (info->rx_buf_list[EndIndex].status == 0xff) {
5044                         spin_lock_irqsave(&info->lock,flags);
5045                         rx_start(info);
5046                         spin_unlock_irqrestore(&info->lock,flags);
5047                 }
5048         }
5049
5050         return ReturnCode;
5051 }
5052
5053 /* load the transmit DMA buffer with data
5054  */
5055 void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int count)
5056 {
5057         unsigned short copy_count;
5058         unsigned int i = 0;
5059         SCADESC *desc;
5060         SCADESC_EX *desc_ex;
5061
5062         if ( debug_level >= DEBUG_LEVEL_DATA )
5063                 trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
5064
5065         /* Copy source buffer to one or more DMA buffers, starting with
5066          * the first transmit dma buffer.
5067          */
5068         for(i=0;;)
5069         {
5070                 copy_count = min_t(unsigned short,count,SCABUFSIZE);
5071
5072                 desc = &info->tx_buf_list[i];
5073                 desc_ex = &info->tx_buf_list_ex[i];
5074
5075                 load_pci_memory(info, desc_ex->virt_addr,buf,copy_count);
5076
5077                 desc->length = copy_count;
5078                 desc->status = 0;
5079
5080                 buf += copy_count;
5081                 count -= copy_count;
5082
5083                 if (!count)
5084                         break;
5085
5086                 i++;
5087                 if (i >= info->tx_buf_count)
5088                         i = 0;
5089         }
5090
5091         info->tx_buf_list[i].status = 0x81;     /* set EOM and EOT status */
5092         info->last_tx_buf = ++i;
5093 }
5094
5095 int register_test(SLMP_INFO *info)
5096 {
5097         static unsigned char testval[] = {0x00, 0xff, 0xaa, 0x55, 0x69, 0x96};
5098         static unsigned int count = ARRAY_SIZE(testval);
5099         unsigned int i;
5100         int rc = TRUE;
5101         unsigned long flags;
5102
5103         spin_lock_irqsave(&info->lock,flags);
5104         reset_port(info);
5105
5106         /* assume failure */
5107         info->init_error = DiagStatus_AddressFailure;
5108
5109         /* Write bit patterns to various registers but do it out of */
5110         /* sync, then read back and verify values. */
5111
5112         for (i = 0 ; i < count ; i++) {
5113                 write_reg(info, TMC, testval[i]);
5114                 write_reg(info, IDL, testval[(i+1)%count]);
5115                 write_reg(info, SA0, testval[(i+2)%count]);
5116                 write_reg(info, SA1, testval[(i+3)%count]);
5117
5118                 if ( (read_reg(info, TMC) != testval[i]) ||
5119                           (read_reg(info, IDL) != testval[(i+1)%count]) ||
5120                           (read_reg(info, SA0) != testval[(i+2)%count]) ||
5121                           (read_reg(info, SA1) != testval[(i+3)%count]) )
5122                 {
5123                         rc = FALSE;
5124                         break;
5125                 }
5126         }
5127
5128         reset_port(info);
5129         spin_unlock_irqrestore(&info->lock,flags);
5130
5131         return rc;
5132 }
5133
5134 int irq_test(SLMP_INFO *info)
5135 {
5136         unsigned long timeout;
5137         unsigned long flags;
5138
5139         unsigned char timer = (info->port_num & 1) ? TIMER2 : TIMER0;
5140
5141         spin_lock_irqsave(&info->lock,flags);
5142         reset_port(info);
5143
5144         /* assume failure */
5145         info->init_error = DiagStatus_IrqFailure;
5146         info->irq_occurred = FALSE;
5147
5148         /* setup timer0 on SCA0 to interrupt */
5149
5150         /* IER2<7..4> = timer<3..0> interrupt enables (1=enabled) */
5151         write_reg(info, IER2, (unsigned char)((info->port_num & 1) ? BIT6 : BIT4));
5152
5153         write_reg(info, (unsigned char)(timer + TEPR), 0);      /* timer expand prescale */
5154         write_reg16(info, (unsigned char)(timer + TCONR), 1);   /* timer constant */
5155
5156
5157         /* TMCS, Timer Control/Status Register
5158          *
5159          * 07      CMF, Compare match flag (read only) 1=match
5160          * 06      ECMI, CMF Interrupt Enable: 1=enabled
5161          * 05      Reserved, must be 0
5162          * 04      TME, Timer Enable
5163          * 03..00  Reserved, must be 0
5164          *
5165          * 0101 0000
5166          */
5167         write_reg(info, (unsigned char)(timer + TMCS), 0x50);
5168
5169         spin_unlock_irqrestore(&info->lock,flags);
5170
5171         timeout=100;
5172         while( timeout-- && !info->irq_occurred ) {
5173                 msleep_interruptible(10);
5174         }
5175
5176         spin_lock_irqsave(&info->lock,flags);
5177         reset_port(info);
5178         spin_unlock_irqrestore(&info->lock,flags);
5179
5180         return info->irq_occurred;
5181 }
5182
5183 /* initialize individual SCA device (2 ports)
5184  */
5185 static int sca_init(SLMP_INFO *info)
5186 {
5187         /* set wait controller to single mem partition (low), no wait states */
5188         write_reg(info, PABR0, 0);      /* wait controller addr boundary 0 */
5189         write_reg(info, PABR1, 0);      /* wait controller addr boundary 1 */
5190         write_reg(info, WCRL, 0);       /* wait controller low range */
5191         write_reg(info, WCRM, 0);       /* wait controller mid range */
5192         write_reg(info, WCRH, 0);       /* wait controller high range */
5193
5194         /* DPCR, DMA Priority Control
5195          *
5196          * 07..05  Not used, must be 0
5197          * 04      BRC, bus release condition: 0=all transfers complete
5198          * 03      CCC, channel change condition: 0=every cycle
5199          * 02..00  PR<2..0>, priority 100=round robin
5200          *
5201          * 00000100 = 0x04
5202          */
5203         write_reg(info, DPCR, dma_priority);
5204
5205         /* DMA Master Enable, BIT7: 1=enable all channels */
5206         write_reg(info, DMER, 0x80);
5207
5208         /* enable all interrupt classes */
5209         write_reg(info, IER0, 0xff);    /* TxRDY,RxRDY,TxINT,RxINT (ports 0-1) */
5210         write_reg(info, IER1, 0xff);    /* DMIB,DMIA (channels 0-3) */
5211         write_reg(info, IER2, 0xf0);    /* TIRQ (timers 0-3) */
5212
5213         /* ITCR, interrupt control register
5214          * 07      IPC, interrupt priority, 0=MSCI->DMA
5215          * 06..05  IAK<1..0>, Acknowledge cycle, 00=non-ack cycle
5216          * 04      VOS, Vector Output, 0=unmodified vector
5217          * 03..00  Reserved, must be 0
5218          */
5219         write_reg(info, ITCR, 0);
5220
5221         return TRUE;
5222 }
5223
5224 /* initialize adapter hardware
5225  */
5226 int init_adapter(SLMP_INFO *info)
5227 {
5228         int i;
5229
5230         /* Set BIT30 of Local Control Reg 0x50 to reset SCA */
5231         volatile u32 *MiscCtrl = (u32 *)(info->lcr_base + 0x50);
5232         u32 readval;
5233
5234         info->misc_ctrl_value |= BIT30;
5235         *MiscCtrl = info->misc_ctrl_value;
5236
5237         /*
5238          * Force at least 170ns delay before clearing
5239          * reset bit. Each read from LCR takes at least
5240          * 30ns so 10 times for 300ns to be safe.
5241          */
5242         for(i=0;i<10;i++)
5243                 readval = *MiscCtrl;
5244
5245         info->misc_ctrl_value &= ~BIT30;
5246         *MiscCtrl = info->misc_ctrl_value;
5247
5248         /* init control reg (all DTRs off, all clksel=input) */
5249         info->ctrlreg_value = 0xaa;
5250         write_control_reg(info);
5251
5252         {
5253                 volatile u32 *LCR1BRDR = (u32 *)(info->lcr_base + 0x2c);
5254                 lcr1_brdr_value &= ~(BIT5 + BIT4 + BIT3);
5255
5256                 switch(read_ahead_count)
5257                 {
5258                 case 16:
5259                         lcr1_brdr_value |= BIT5 + BIT4 + BIT3;
5260                         break;
5261                 case 8:
5262                         lcr1_brdr_value |= BIT5 + BIT4;
5263                         break;
5264                 case 4:
5265                         lcr1_brdr_value |= BIT5 + BIT3;
5266                         break;
5267                 case 0:
5268                         lcr1_brdr_value |= BIT5;
5269                         break;
5270                 }
5271
5272                 *LCR1BRDR = lcr1_brdr_value;
5273                 *MiscCtrl = misc_ctrl_value;
5274         }
5275
5276         sca_init(info->port_array[0]);
5277         sca_init(info->port_array[2]);
5278
5279         return TRUE;
5280 }
5281
5282 /* Loopback an HDLC frame to test the hardware
5283  * interrupt and DMA functions.
5284  */
5285 int loopback_test(SLMP_INFO *info)
5286 {
5287 #define TESTFRAMESIZE 20
5288
5289         unsigned long timeout;
5290         u16 count = TESTFRAMESIZE;
5291         unsigned char buf[TESTFRAMESIZE];
5292         int rc = FALSE;
5293         unsigned long flags;
5294
5295         struct tty_struct *oldtty = info->tty;
5296         u32 speed = info->params.clock_speed;
5297
5298         info->params.clock_speed = 3686400;
5299         info->tty = NULL;
5300
5301         /* assume failure */
5302         info->init_error = DiagStatus_DmaFailure;
5303
5304         /* build and send transmit frame */
5305         for (count = 0; count < TESTFRAMESIZE;++count)
5306                 buf[count] = (unsigned char)count;
5307
5308         memset(info->tmp_rx_buf,0,TESTFRAMESIZE);
5309
5310         /* program hardware for HDLC and enabled receiver */
5311         spin_lock_irqsave(&info->lock,flags);
5312         hdlc_mode(info);
5313         enable_loopback(info,1);
5314         rx_start(info);
5315         info->tx_count = count;
5316         tx_load_dma_buffer(info,buf,count);
5317         tx_start(info);
5318         spin_unlock_irqrestore(&info->lock,flags);
5319
5320         /* wait for receive complete */
5321         /* Set a timeout for waiting for interrupt. */
5322         for ( timeout = 100; timeout; --timeout ) {
5323                 msleep_interruptible(10);
5324
5325                 if (rx_get_frame(info)) {
5326                         rc = TRUE;
5327                         break;
5328                 }
5329         }
5330
5331         /* verify received frame length and contents */
5332         if (rc == TRUE &&
5333                 ( info->tmp_rx_buf_count != count ||
5334                   memcmp(buf, info->tmp_rx_buf,count))) {
5335                 rc = FALSE;
5336         }
5337
5338         spin_lock_irqsave(&info->lock,flags);
5339         reset_adapter(info);
5340         spin_unlock_irqrestore(&info->lock,flags);
5341
5342         info->params.clock_speed = speed;
5343         info->tty = oldtty;
5344
5345         return rc;
5346 }
5347
5348 /* Perform diagnostics on hardware
5349  */
5350 int adapter_test( SLMP_INFO *info )
5351 {
5352         unsigned long flags;
5353         if ( debug_level >= DEBUG_LEVEL_INFO )
5354                 printk( "%s(%d):Testing device %s\n",
5355                         __FILE__,__LINE__,info->device_name );
5356
5357         spin_lock_irqsave(&info->lock,flags);
5358         init_adapter(info);
5359         spin_unlock_irqrestore(&info->lock,flags);
5360
5361         info->port_array[0]->port_count = 0;
5362
5363         if ( register_test(info->port_array[0]) &&
5364                 register_test(info->port_array[1])) {
5365
5366                 info->port_array[0]->port_count = 2;
5367
5368                 if ( register_test(info->port_array[2]) &&
5369                         register_test(info->port_array[3]) )
5370                         info->port_array[0]->port_count += 2;
5371         }
5372         else {
5373                 printk( "%s(%d):Register test failure for device %s Addr=%08lX\n",
5374                         __FILE__,__LINE__,info->device_name, (unsigned long)(info->phys_sca_base));
5375                 return -ENODEV;
5376         }
5377
5378         if ( !irq_test(info->port_array[0]) ||
5379                 !irq_test(info->port_array[1]) ||
5380                  (info->port_count == 4 && !irq_test(info->port_array[2])) ||
5381                  (info->port_count == 4 && !irq_test(info->port_array[3]))) {
5382                 printk( "%s(%d):Interrupt test failure for device %s IRQ=%d\n",
5383                         __FILE__,__LINE__,info->device_name, (unsigned short)(info->irq_level) );
5384                 return -ENODEV;
5385         }
5386
5387         if (!loopback_test(info->port_array[0]) ||
5388                 !loopback_test(info->port_array[1]) ||
5389                  (info->port_count == 4 && !loopback_test(info->port_array[2])) ||
5390                  (info->port_count == 4 && !loopback_test(info->port_array[3]))) {
5391                 printk( "%s(%d):DMA test failure for device %s\n",
5392                         __FILE__,__LINE__,info->device_name);
5393                 return -ENODEV;
5394         }
5395
5396         if ( debug_level >= DEBUG_LEVEL_INFO )
5397                 printk( "%s(%d):device %s passed diagnostics\n",
5398                         __FILE__,__LINE__,info->device_name );
5399
5400         info->port_array[0]->init_error = 0;
5401         info->port_array[1]->init_error = 0;
5402         if ( info->port_count > 2 ) {
5403                 info->port_array[2]->init_error = 0;
5404                 info->port_array[3]->init_error = 0;
5405         }
5406
5407         return 0;
5408 }
5409
5410 /* Test the shared memory on a PCI adapter.
5411  */
5412 int memory_test(SLMP_INFO *info)
5413 {
5414         static unsigned long testval[] = { 0x0, 0x55555555, 0xaaaaaaaa,
5415                 0x66666666, 0x99999999, 0xffffffff, 0x12345678 };
5416         unsigned long count = ARRAY_SIZE(testval);
5417         unsigned long i;
5418         unsigned long limit = SCA_MEM_SIZE/sizeof(unsigned long);
5419         unsigned long * addr = (unsigned long *)info->memory_base;
5420
5421         /* Test data lines with test pattern at one location. */
5422
5423         for ( i = 0 ; i < count ; i++ ) {
5424                 *addr = testval[i];
5425                 if ( *addr != testval[i] )
5426                         return FALSE;
5427         }
5428
5429         /* Test address lines with incrementing pattern over */
5430         /* entire address range. */
5431
5432         for ( i = 0 ; i < limit ; i++ ) {
5433                 *addr = i * 4;
5434                 addr++;
5435         }
5436
5437         addr = (unsigned long *)info->memory_base;
5438
5439         for ( i = 0 ; i < limit ; i++ ) {
5440                 if ( *addr != i * 4 )
5441                         return FALSE;
5442                 addr++;
5443         }
5444
5445         memset( info->memory_base, 0, SCA_MEM_SIZE );
5446         return TRUE;
5447 }
5448
5449 /* Load data into PCI adapter shared memory.
5450  *
5451  * The PCI9050 releases control of the local bus
5452  * after completing the current read or write operation.
5453  *
5454  * While the PCI9050 write FIFO not empty, the
5455  * PCI9050 treats all of the writes as a single transaction
5456  * and does not release the bus. This causes DMA latency problems
5457  * at high speeds when copying large data blocks to the shared memory.
5458  *
5459  * This function breaks a write into multiple transations by
5460  * interleaving a read which flushes the write FIFO and 'completes'
5461  * the write transation. This allows any pending DMA request to gain control
5462  * of the local bus in a timely fasion.
5463  */
5464 void load_pci_memory(SLMP_INFO *info, char* dest, const char* src, unsigned short count)
5465 {
5466         /* A load interval of 16 allows for 4 32-bit writes at */
5467         /* 136ns each for a maximum latency of 542ns on the local bus.*/
5468
5469         unsigned short interval = count / sca_pci_load_interval;
5470         unsigned short i;
5471
5472         for ( i = 0 ; i < interval ; i++ )
5473         {
5474                 memcpy(dest, src, sca_pci_load_interval);
5475                 read_status_reg(info);
5476                 dest += sca_pci_load_interval;
5477                 src += sca_pci_load_interval;
5478         }
5479
5480         memcpy(dest, src, count % sca_pci_load_interval);
5481 }
5482
5483 void trace_block(SLMP_INFO *info,const char* data, int count, int xmit)
5484 {
5485         int i;
5486         int linecount;
5487         if (xmit)
5488                 printk("%s tx data:\n",info->device_name);
5489         else
5490                 printk("%s rx data:\n",info->device_name);
5491
5492         while(count) {
5493                 if (count > 16)
5494                         linecount = 16;
5495                 else
5496                         linecount = count;
5497
5498                 for(i=0;i<linecount;i++)
5499                         printk("%02X ",(unsigned char)data[i]);
5500                 for(;i<17;i++)
5501                         printk("   ");
5502                 for(i=0;i<linecount;i++) {
5503                         if (data[i]>=040 && data[i]<=0176)
5504                                 printk("%c",data[i]);
5505                         else
5506                                 printk(".");
5507                 }
5508                 printk("\n");
5509
5510                 data  += linecount;
5511                 count -= linecount;
5512         }
5513 }       /* end of trace_block() */
5514
5515 /* called when HDLC frame times out
5516  * update stats and do tx completion processing
5517  */
5518 void tx_timeout(unsigned long context)
5519 {
5520         SLMP_INFO *info = (SLMP_INFO*)context;
5521         unsigned long flags;
5522
5523         if ( debug_level >= DEBUG_LEVEL_INFO )
5524                 printk( "%s(%d):%s tx_timeout()\n",
5525                         __FILE__,__LINE__,info->device_name);
5526         if(info->tx_active && info->params.mode == MGSL_MODE_HDLC) {
5527                 info->icount.txtimeout++;
5528         }
5529         spin_lock_irqsave(&info->lock,flags);
5530         info->tx_active = 0;
5531         info->tx_count = info->tx_put = info->tx_get = 0;
5532
5533         spin_unlock_irqrestore(&info->lock,flags);
5534
5535 #if SYNCLINK_GENERIC_HDLC
5536         if (info->netcount)
5537                 hdlcdev_tx_done(info);
5538         else
5539 #endif
5540                 bh_transmit(info);
5541 }
5542
5543 /* called to periodically check the DSR/RI modem signal input status
5544  */
5545 void status_timeout(unsigned long context)
5546 {
5547         u16 status = 0;
5548         SLMP_INFO *info = (SLMP_INFO*)context;
5549         unsigned long flags;
5550         unsigned char delta;
5551
5552
5553         spin_lock_irqsave(&info->lock,flags);
5554         get_signals(info);
5555         spin_unlock_irqrestore(&info->lock,flags);
5556
5557         /* check for DSR/RI state change */
5558
5559         delta = info->old_signals ^ info->serial_signals;
5560         info->old_signals = info->serial_signals;
5561
5562         if (delta & SerialSignal_DSR)
5563                 status |= MISCSTATUS_DSR_LATCHED|(info->serial_signals&SerialSignal_DSR);
5564
5565         if (delta & SerialSignal_RI)
5566                 status |= MISCSTATUS_RI_LATCHED|(info->serial_signals&SerialSignal_RI);
5567
5568         if (delta & SerialSignal_DCD)
5569                 status |= MISCSTATUS_DCD_LATCHED|(info->serial_signals&SerialSignal_DCD);
5570
5571         if (delta & SerialSignal_CTS)
5572                 status |= MISCSTATUS_CTS_LATCHED|(info->serial_signals&SerialSignal_CTS);
5573
5574         if (status)
5575                 isr_io_pin(info,status);
5576
5577         info->status_timer.data = (unsigned long)info;
5578         info->status_timer.function = status_timeout;
5579         info->status_timer.expires = jiffies + msecs_to_jiffies(10);
5580         add_timer(&info->status_timer);
5581 }
5582
5583
5584 /* Register Access Routines -
5585  * All registers are memory mapped
5586  */
5587 #define CALC_REGADDR() \
5588         unsigned char * RegAddr = (unsigned char*)(info->sca_base + Addr); \
5589         if (info->port_num > 1) \
5590                 RegAddr += 256;                 /* port 0-1 SCA0, 2-3 SCA1 */ \
5591         if ( info->port_num & 1) { \
5592                 if (Addr > 0x7f) \
5593                         RegAddr += 0x40;        /* DMA access */ \
5594                 else if (Addr > 0x1f && Addr < 0x60) \
5595                         RegAddr += 0x20;        /* MSCI access */ \
5596         }
5597
5598
5599 unsigned char read_reg(SLMP_INFO * info, unsigned char Addr)
5600 {
5601         CALC_REGADDR();
5602         return *RegAddr;
5603 }
5604 void write_reg(SLMP_INFO * info, unsigned char Addr, unsigned char Value)
5605 {
5606         CALC_REGADDR();
5607         *RegAddr = Value;
5608 }
5609
5610 u16 read_reg16(SLMP_INFO * info, unsigned char Addr)
5611 {
5612         CALC_REGADDR();
5613         return *((u16 *)RegAddr);
5614 }
5615
5616 void write_reg16(SLMP_INFO * info, unsigned char Addr, u16 Value)
5617 {
5618         CALC_REGADDR();
5619         *((u16 *)RegAddr) = Value;
5620 }
5621
5622 unsigned char read_status_reg(SLMP_INFO * info)
5623 {
5624         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5625         return *RegAddr;
5626 }
5627
5628 void write_control_reg(SLMP_INFO * info)
5629 {
5630         unsigned char *RegAddr = (unsigned char *)info->statctrl_base;
5631         *RegAddr = info->port_array[0]->ctrlreg_value;
5632 }
5633
5634
5635 static int __devinit synclinkmp_init_one (struct pci_dev *dev,
5636                                           const struct pci_device_id *ent)
5637 {
5638         if (pci_enable_device(dev)) {
5639                 printk("error enabling pci device %p\n", dev);
5640                 return -EIO;
5641         }
5642         device_init( ++synclinkmp_adapter_count, dev );
5643         return 0;
5644 }
5645
5646 static void __devexit synclinkmp_remove_one (struct pci_dev *dev)
5647 {
5648 }