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