drivers/char/vme_scc.c

   1 /*
   2  * drivers/char/vme_scc.c: MVME147, MVME162, BVME6000 SCC serial ports
   3  * implementation.
   4  * Copyright 1999 Richard Hirst <richard@sleepie.demon.co.uk>
   5  *
   6  * Based on atari_SCC.c which was
   7  *   Copyright 1994-95 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
   8  *   Partially based on PC-Linux serial.c by Linus Torvalds and Theodore Ts'o
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file COPYING in the main directory of this archive
  12  * for more details.
  13  *
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/kdev_t.h>
  18 #include <asm/io.h>
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/ioport.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/errno.h>
  24 #include <linux/tty.h>
  25 #include <linux/tty_flip.h>
  26 #include <linux/mm.h>
  27 #include <linux/serial.h>
  28 #include <linux/fcntl.h>
  29 #include <linux/major.h>
  30 #include <linux/delay.h>
  31 #include <linux/slab.h>
  32 #include <linux/miscdevice.h>
  33 #include <linux/console.h>
  34 #include <linux/init.h>
  35 #include <asm/setup.h>
  36 #include <asm/bootinfo.h>
  37
  38 #ifdef CONFIG_MVME147_SCC
  39 #include <asm/mvme147hw.h>
  40 #endif
  41 #ifdef CONFIG_MVME162_SCC
  42 #include <asm/mvme16xhw.h>
  43 #endif
  44 #ifdef CONFIG_BVME6000_SCC
  45 #include <asm/bvme6000hw.h>
  46 #endif
  47
  48 #include <linux/generic_serial.h>
  49 #include "scc.h"
  50
  51
  52 #define CHANNEL_A       0
  53 #define CHANNEL_B       1
  54
  55 #define SCC_MINOR_BASE  64
  56
  57 /* Shadows for all SCC write registers */
  58 static unsigned char scc_shadow[2][16];
  59
  60 /* Location to access for SCC register access delay */
  61 static volatile unsigned char *scc_del = NULL;
  62
  63 /* To keep track of STATUS_REG state for detection of Ext/Status int source */
  64 static unsigned char scc_last_status_reg[2];
  65
  66 /***************************** Prototypes *****************************/
  67
  68 /* Function prototypes */
  69 static void scc_disable_tx_interrupts(void * ptr);
  70 static void scc_enable_tx_interrupts(void * ptr);
  71 static void scc_disable_rx_interrupts(void * ptr);
  72 static void scc_enable_rx_interrupts(void * ptr);
  73 static int  scc_get_CD(void * ptr);
  74 static void scc_shutdown_port(void * ptr);
  75 static int scc_set_real_termios(void  *ptr);
  76 static void scc_hungup(void  *ptr);
  77 static void scc_close(void  *ptr);
  78 static int scc_chars_in_buffer(void * ptr);
  79 static int scc_open(struct tty_struct * tty, struct file * filp);
  80 static int scc_ioctl(struct tty_struct * tty, struct file * filp,
  81                      unsigned int cmd, unsigned long arg);
  82 static void scc_throttle(struct tty_struct *tty);
  83 static void scc_unthrottle(struct tty_struct *tty);
  84 static irqreturn_t scc_tx_int(int irq, void *data);
  85 static irqreturn_t scc_rx_int(int irq, void *data);
  86 static irqreturn_t scc_stat_int(int irq, void *data);
  87 static irqreturn_t scc_spcond_int(int irq, void *data);
  88 static void scc_setsignals(struct scc_port *port, int dtr, int rts);
  89 static void scc_break_ctl(struct tty_struct *tty, int break_state);
  90
  91 static struct tty_driver *scc_driver;
  92
  93 struct scc_port scc_ports[2];
  94
  95 int scc_initialized = 0;
  96
  97 /*---------------------------------------------------------------------------
  98  * Interface from generic_serial.c back here
  99  *--------------------------------------------------------------------------*/
 100
 101 static struct real_driver scc_real_driver = {
 102         scc_disable_tx_interrupts,
 103         scc_enable_tx_interrupts,
 104         scc_disable_rx_interrupts,
 105         scc_enable_rx_interrupts,
 106         scc_get_CD,
 107         scc_shutdown_port,
 108         scc_set_real_termios,
 109         scc_chars_in_buffer,
 110         scc_close,
 111         scc_hungup,
 112         NULL
 113 };
 114
 115
 116 static const struct tty_operations scc_ops = {
 117         .open   = scc_open,
 118         .close = gs_close,
 119         .write = gs_write,
 120         .put_char = gs_put_char,
 121         .flush_chars = gs_flush_chars,
 122         .write_room = gs_write_room,
 123         .chars_in_buffer = gs_chars_in_buffer,
 124         .flush_buffer = gs_flush_buffer,
 125         .ioctl = scc_ioctl,
 126         .throttle = scc_throttle,
 127         .unthrottle = scc_unthrottle,
 128         .set_termios = gs_set_termios,
 129         .stop = gs_stop,
 130         .start = gs_start,
 131         .hangup = gs_hangup,
 132         .break_ctl = scc_break_ctl,
 133 };
 134
 135 /*----------------------------------------------------------------------------
 136  * vme_scc_init() and support functions
 137  *---------------------------------------------------------------------------*/
 138
 139 static int scc_init_drivers(void)
 140 {
 141         int error;
 142
 143         scc_driver = alloc_tty_driver(2);
 144         if (!scc_driver)
 145                 return -ENOMEM;
 146         scc_driver->owner = THIS_MODULE;
 147         scc_driver->driver_name = "scc";
 148         scc_driver->name = "ttyS";
 149         scc_driver->major = TTY_MAJOR;
 150         scc_driver->minor_start = SCC_MINOR_BASE;
 151         scc_driver->type = TTY_DRIVER_TYPE_SERIAL;
 152         scc_driver->subtype = SERIAL_TYPE_NORMAL;
 153         scc_driver->init_termios = tty_std_termios;
 154         scc_driver->init_termios.c_cflag =
 155           B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 156         scc_driver->init_termios.c_ispeed = 9600;
 157         scc_driver->init_termios.c_ospeed = 9600;
 158         scc_driver->flags = TTY_DRIVER_REAL_RAW;
 159         tty_set_operations(scc_driver, &scc_ops);
 160
 161         if ((error = tty_register_driver(scc_driver))) {
 162                 printk(KERN_ERR "scc: Couldn't register scc driver, error = %d\n",
 163                        error);
 164                 put_tty_driver(scc_driver);
 165                 return 1;
 166         }
 167
 168         return 0;
 169 }
 170
 171
 172 /* ports[] array is indexed by line no (i.e. [0] for ttyS0, [1] for ttyS1).
 173  */
 174
 175 static void scc_init_portstructs(void)
 176 {
 177         struct scc_port *port;
 178         int i;
 179
 180         for (i = 0; i < 2; i++) {
 181                 port = scc_ports + i;
 182                 port->gs.magic = SCC_MAGIC;
 183                 port->gs.close_delay = HZ/2;
 184                 port->gs.closing_wait = 30 * HZ;
 185                 port->gs.rd = &scc_real_driver;
 186 #ifdef NEW_WRITE_LOCKING
 187                 port->gs.port_write_mutex = MUTEX;
 188 #endif
 189                 init_waitqueue_head(&port->gs.open_wait);
 190                 init_waitqueue_head(&port->gs.close_wait);
 191         }
 192 }
 193
 194
 195 #ifdef CONFIG_MVME147_SCC
 196 static int mvme147_scc_init(void)
 197 {
 198         struct scc_port *port;
 199
 200         printk(KERN_INFO "SCC: MVME147 Serial Driver\n");
 201         /* Init channel A */
 202         port = &scc_ports[0];
 203         port->channel = CHANNEL_A;
 204         port->ctrlp = (volatile unsigned char *)M147_SCC_A_ADDR;
 205         port->datap = port->ctrlp + 1;
 206         port->port_a = &scc_ports[0];
 207         port->port_b = &scc_ports[1];
 208         request_irq(MVME147_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
 209                             "SCC-A TX", port);
 210         request_irq(MVME147_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
 211                             "SCC-A status", port);
 212         request_irq(MVME147_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
 213                             "SCC-A RX", port);
 214         request_irq(MVME147_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
 215                             "SCC-A special cond", port);
 216         {
 217                 SCC_ACCESS_INIT(port);
 218
 219                 /* disable interrupts for this channel */
 220                 SCCwrite(INT_AND_DMA_REG, 0);
 221                 /* Set the interrupt vector */
 222                 SCCwrite(INT_VECTOR_REG, MVME147_IRQ_SCC_BASE);
 223                 /* Interrupt parameters: vector includes status, status low */
 224                 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
 225                 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
 226         }
 227
 228         /* Init channel B */
 229         port = &scc_ports[1];
 230         port->channel = CHANNEL_B;
 231         port->ctrlp = (volatile unsigned char *)M147_SCC_B_ADDR;
 232         port->datap = port->ctrlp + 1;
 233         port->port_a = &scc_ports[0];
 234         port->port_b = &scc_ports[1];
 235         request_irq(MVME147_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
 236                             "SCC-B TX", port);
 237         request_irq(MVME147_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
 238                             "SCC-B status", port);
 239         request_irq(MVME147_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
 240                             "SCC-B RX", port);
 241         request_irq(MVME147_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
 242                             "SCC-B special cond", port);
 243         {
 244                 SCC_ACCESS_INIT(port);
 245
 246                 /* disable interrupts for this channel */
 247                 SCCwrite(INT_AND_DMA_REG, 0);
 248         }
 249
 250         /* Ensure interrupts are enabled in the PCC chip */
 251         m147_pcc->serial_cntrl=PCC_LEVEL_SERIAL|PCC_INT_ENAB;
 252
 253         /* Initialise the tty driver structures and register */
 254         scc_init_portstructs();
 255         scc_init_drivers();
 256
 257         return 0;
 258 }
 259 #endif
 260
 261
 262 #ifdef CONFIG_MVME162_SCC
 263 static int mvme162_scc_init(void)
 264 {
 265         struct scc_port *port;
 266
 267         if (!(mvme16x_config & MVME16x_CONFIG_GOT_SCCA))
 268                 return (-ENODEV);
 269
 270         printk(KERN_INFO "SCC: MVME162 Serial Driver\n");
 271         /* Init channel A */
 272         port = &scc_ports[0];
 273         port->channel = CHANNEL_A;
 274         port->ctrlp = (volatile unsigned char *)MVME_SCC_A_ADDR;
 275         port->datap = port->ctrlp + 2;
 276         port->port_a = &scc_ports[0];
 277         port->port_b = &scc_ports[1];
 278         request_irq(MVME162_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
 279                             "SCC-A TX", port);
 280         request_irq(MVME162_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
 281                             "SCC-A status", port);
 282         request_irq(MVME162_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
 283                             "SCC-A RX", port);
 284         request_irq(MVME162_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
 285                             "SCC-A special cond", port);
 286         {
 287                 SCC_ACCESS_INIT(port);
 288
 289                 /* disable interrupts for this channel */
 290                 SCCwrite(INT_AND_DMA_REG, 0);
 291                 /* Set the interrupt vector */
 292                 SCCwrite(INT_VECTOR_REG, MVME162_IRQ_SCC_BASE);
 293                 /* Interrupt parameters: vector includes status, status low */
 294                 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
 295                 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
 296         }
 297
 298         /* Init channel B */
 299         port = &scc_ports[1];
 300         port->channel = CHANNEL_B;
 301         port->ctrlp = (volatile unsigned char *)MVME_SCC_B_ADDR;
 302         port->datap = port->ctrlp + 2;
 303         port->port_a = &scc_ports[0];
 304         port->port_b = &scc_ports[1];
 305         request_irq(MVME162_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
 306                             "SCC-B TX", port);
 307         request_irq(MVME162_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
 308                             "SCC-B status", port);
 309         request_irq(MVME162_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
 310                             "SCC-B RX", port);
 311         request_irq(MVME162_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
 312                             "SCC-B special cond", port);
 313
 314         {
 315                 SCC_ACCESS_INIT(port);  /* Either channel will do */
 316
 317                 /* disable interrupts for this channel */
 318                 SCCwrite(INT_AND_DMA_REG, 0);
 319         }
 320
 321         /* Ensure interrupts are enabled in the MC2 chip */
 322         *(volatile char *)0xfff4201d = 0x14;
 323
 324         /* Initialise the tty driver structures and register */
 325         scc_init_portstructs();
 326         scc_init_drivers();
 327
 328         return 0;
 329 }
 330 #endif
 331
 332
 333 #ifdef CONFIG_BVME6000_SCC
 334 static int bvme6000_scc_init(void)
 335 {
 336         struct scc_port *port;
 337
 338         printk(KERN_INFO "SCC: BVME6000 Serial Driver\n");
 339         /* Init channel A */
 340         port = &scc_ports[0];
 341         port->channel = CHANNEL_A;
 342         port->ctrlp = (volatile unsigned char *)BVME_SCC_A_ADDR;
 343         port->datap = port->ctrlp + 4;
 344         port->port_a = &scc_ports[0];
 345         port->port_b = &scc_ports[1];
 346         request_irq(BVME_IRQ_SCCA_TX, scc_tx_int, IRQF_DISABLED,
 347                             "SCC-A TX", port);
 348         request_irq(BVME_IRQ_SCCA_STAT, scc_stat_int, IRQF_DISABLED,
 349                             "SCC-A status", port);
 350         request_irq(BVME_IRQ_SCCA_RX, scc_rx_int, IRQF_DISABLED,
 351                             "SCC-A RX", port);
 352         request_irq(BVME_IRQ_SCCA_SPCOND, scc_spcond_int, IRQF_DISABLED,
 353                             "SCC-A special cond", port);
 354         {
 355                 SCC_ACCESS_INIT(port);
 356
 357                 /* disable interrupts for this channel */
 358                 SCCwrite(INT_AND_DMA_REG, 0);
 359                 /* Set the interrupt vector */
 360                 SCCwrite(INT_VECTOR_REG, BVME_IRQ_SCC_BASE);
 361                 /* Interrupt parameters: vector includes status, status low */
 362                 SCCwrite(MASTER_INT_CTRL, MIC_VEC_INCL_STAT);
 363                 SCCmod(MASTER_INT_CTRL, 0xff, MIC_MASTER_INT_ENAB);
 364         }
 365
 366         /* Init channel B */
 367         port = &scc_ports[1];
 368         port->channel = CHANNEL_B;
 369         port->ctrlp = (volatile unsigned char *)BVME_SCC_B_ADDR;
 370         port->datap = port->ctrlp + 4;
 371         port->port_a = &scc_ports[0];
 372         port->port_b = &scc_ports[1];
 373         request_irq(BVME_IRQ_SCCB_TX, scc_tx_int, IRQF_DISABLED,
 374                             "SCC-B TX", port);
 375         request_irq(BVME_IRQ_SCCB_STAT, scc_stat_int, IRQF_DISABLED,
 376                             "SCC-B status", port);
 377         request_irq(BVME_IRQ_SCCB_RX, scc_rx_int, IRQF_DISABLED,
 378                             "SCC-B RX", port);
 379         request_irq(BVME_IRQ_SCCB_SPCOND, scc_spcond_int, IRQF_DISABLED,
 380                             "SCC-B special cond", port);
 381
 382         {
 383                 SCC_ACCESS_INIT(port);  /* Either channel will do */
 384
 385                 /* disable interrupts for this channel */
 386                 SCCwrite(INT_AND_DMA_REG, 0);
 387         }
 388
 389         /* Initialise the tty driver structures and register */
 390         scc_init_portstructs();
 391         scc_init_drivers();
 392
 393         return 0;
 394 }
 395 #endif
 396
 397
 398 static int vme_scc_init(void)
 399 {
 400         int res = -ENODEV;
 401
 402 #ifdef CONFIG_MVME147_SCC
 403         if (MACH_IS_MVME147)
 404                 res = mvme147_scc_init();
 405 #endif
 406 #ifdef CONFIG_MVME162_SCC
 407         if (MACH_IS_MVME16x)
 408                 res = mvme162_scc_init();
 409 #endif
 410 #ifdef CONFIG_BVME6000_SCC
 411         if (MACH_IS_BVME6000)
 412                 res = bvme6000_scc_init();
 413 #endif
 414         return res;
 415 }
 416
 417 module_init(vme_scc_init);
 418
 419
 420 /*---------------------------------------------------------------------------
 421  * Interrupt handlers
 422  *--------------------------------------------------------------------------*/
 423
 424 static irqreturn_t scc_rx_int(int irq, void *data)
 425 {
 426         unsigned char   ch;
 427         struct scc_port *port = data;
 428         struct tty_struct *tty = port->gs.tty;
 429         SCC_ACCESS_INIT(port);
 430
 431         ch = SCCread_NB(RX_DATA_REG);
 432         if (!tty) {
 433                 printk(KERN_WARNING "scc_rx_int with NULL tty!\n");
 434                 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 435                 return IRQ_HANDLED;
 436         }
 437         tty_insert_flip_char(tty, ch, 0);
 438
 439         /* Check if another character is already ready; in that case, the
 440          * spcond_int() function must be used, because this character may have an
 441          * error condition that isn't signalled by the interrupt vector used!
 442          */
 443         if (SCCread(INT_PENDING_REG) &
 444             (port->channel == CHANNEL_A ? IPR_A_RX : IPR_B_RX)) {
 445                 scc_spcond_int (irq, data);
 446                 return IRQ_HANDLED;
 447         }
 448
 449         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 450
 451         tty_flip_buffer_push(tty);
 452         return IRQ_HANDLED;
 453 }
 454
 455
 456 static irqreturn_t scc_spcond_int(int irq, void *data)
 457 {
 458         struct scc_port *port = data;
 459         struct tty_struct *tty = port->gs.tty;
 460         unsigned char   stat, ch, err;
 461         int             int_pending_mask = port->channel == CHANNEL_A ?
 462                                            IPR_A_RX : IPR_B_RX;
 463         SCC_ACCESS_INIT(port);
 464
 465         if (!tty) {
 466                 printk(KERN_WARNING "scc_spcond_int with NULL tty!\n");
 467                 SCCwrite(COMMAND_REG, CR_ERROR_RESET);
 468                 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 469                 return IRQ_HANDLED;
 470         }
 471         do {
 472                 stat = SCCread(SPCOND_STATUS_REG);
 473                 ch = SCCread_NB(RX_DATA_REG);
 474
 475                 if (stat & SCSR_RX_OVERRUN)
 476                         err = TTY_OVERRUN;
 477                 else if (stat & SCSR_PARITY_ERR)
 478                         err = TTY_PARITY;
 479                 else if (stat & SCSR_CRC_FRAME_ERR)
 480                         err = TTY_FRAME;
 481                 else
 482                         err = 0;
 483
 484                 tty_insert_flip_char(tty, ch, err);
 485
 486                 /* ++TeSche: *All* errors have to be cleared manually,
 487                  * else the condition persists for the next chars
 488                  */
 489                 if (err)
 490                   SCCwrite(COMMAND_REG, CR_ERROR_RESET);
 491
 492         } while(SCCread(INT_PENDING_REG) & int_pending_mask);
 493
 494         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 495
 496         tty_flip_buffer_push(tty);
 497         return IRQ_HANDLED;
 498 }
 499
 500
 501 static irqreturn_t scc_tx_int(int irq, void *data)
 502 {
 503         struct scc_port *port = data;
 504         SCC_ACCESS_INIT(port);
 505
 506         if (!port->gs.tty) {
 507                 printk(KERN_WARNING "scc_tx_int with NULL tty!\n");
 508                 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
 509                 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);
 510                 SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 511                 return IRQ_HANDLED;
 512         }
 513         while ((SCCread_NB(STATUS_REG) & SR_TX_BUF_EMPTY)) {
 514                 if (port->x_char) {
 515                         SCCwrite(TX_DATA_REG, port->x_char);
 516                         port->x_char = 0;
 517                 }
 518                 else if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
 519                                 port->gs.tty->hw_stopped)
 520                         break;
 521                 else {
 522                         SCCwrite(TX_DATA_REG, port->gs.xmit_buf[port->gs.xmit_tail++]);
 523                         port->gs.xmit_tail = port->gs.xmit_tail & (SERIAL_XMIT_SIZE-1);
 524                         if (--port->gs.xmit_cnt <= 0)
 525                                 break;
 526                 }
 527         }
 528         if ((port->gs.xmit_cnt <= 0) || port->gs.tty->stopped ||
 529                         port->gs.tty->hw_stopped) {
 530                 /* disable tx interrupts */
 531                 SCCmod (INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
 532                 SCCwrite(COMMAND_REG, CR_TX_PENDING_RESET);   /* disable tx_int on next tx underrun? */
 533                 port->gs.flags &= ~GS_TX_INTEN;
 534         }
 535         if (port->gs.tty && port->gs.xmit_cnt <= port->gs.wakeup_chars)
 536                 tty_wakeup(port->gs.tty);
 537
 538         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 539         return IRQ_HANDLED;
 540 }
 541
 542
 543 static irqreturn_t scc_stat_int(int irq, void *data)
 544 {
 545         struct scc_port *port = data;
 546         unsigned channel = port->channel;
 547         unsigned char   last_sr, sr, changed;
 548         SCC_ACCESS_INIT(port);
 549
 550         last_sr = scc_last_status_reg[channel];
 551         sr = scc_last_status_reg[channel] = SCCread_NB(STATUS_REG);
 552         changed = last_sr ^ sr;
 553
 554         if (changed & SR_DCD) {
 555                 port->c_dcd = !!(sr & SR_DCD);
 556                 if (!(port->gs.flags & ASYNC_CHECK_CD))
 557                         ;       /* Don't report DCD changes */
 558                 else if (port->c_dcd) {
 559                         wake_up_interruptible(&port->gs.open_wait);
 560                 }
 561                 else {
 562                         if (port->gs.tty)
 563                                 tty_hangup (port->gs.tty);
 564                 }
 565         }
 566         SCCwrite(COMMAND_REG, CR_EXTSTAT_RESET);
 567         SCCwrite_NB(COMMAND_REG, CR_HIGHEST_IUS_RESET);
 568         return IRQ_HANDLED;
 569 }
 570
 571
 572 /*---------------------------------------------------------------------------
 573  * generic_serial.c callback funtions
 574  *--------------------------------------------------------------------------*/
 575
 576 static void scc_disable_tx_interrupts(void *ptr)
 577 {
 578         struct scc_port *port = ptr;
 579         unsigned long   flags;
 580         SCC_ACCESS_INIT(port);
 581
 582         local_irq_save(flags);
 583         SCCmod(INT_AND_DMA_REG, ~IDR_TX_INT_ENAB, 0);
 584         port->gs.flags &= ~GS_TX_INTEN;
 585         local_irq_restore(flags);
 586 }
 587
 588
 589 static void scc_enable_tx_interrupts(void *ptr)
 590 {
 591         struct scc_port *port = ptr;
 592         unsigned long   flags;
 593         SCC_ACCESS_INIT(port);
 594
 595         local_irq_save(flags);
 596         SCCmod(INT_AND_DMA_REG, 0xff, IDR_TX_INT_ENAB);
 597         /* restart the transmitter */
 598         scc_tx_int (0, port);
 599         local_irq_restore(flags);
 600 }
 601
 602
 603 static void scc_disable_rx_interrupts(void *ptr)
 604 {
 605         struct scc_port *port = ptr;
 606         unsigned long   flags;
 607         SCC_ACCESS_INIT(port);
 608
 609         local_irq_save(flags);
 610         SCCmod(INT_AND_DMA_REG,
 611             ~(IDR_RX_INT_MASK|IDR_PARERR_AS_SPCOND|IDR_EXTSTAT_INT_ENAB), 0);
 612         local_irq_restore(flags);
 613 }
 614
 615
 616 static void scc_enable_rx_interrupts(void *ptr)
 617 {
 618         struct scc_port *port = ptr;
 619         unsigned long   flags;
 620         SCC_ACCESS_INIT(port);
 621
 622         local_irq_save(flags);
 623         SCCmod(INT_AND_DMA_REG, 0xff,
 624                 IDR_EXTSTAT_INT_ENAB|IDR_PARERR_AS_SPCOND|IDR_RX_INT_ALL);
 625         local_irq_restore(flags);
 626 }
 627
 628
 629 static int scc_get_CD(void *ptr)
 630 {
 631         struct scc_port *port = ptr;
 632         unsigned channel = port->channel;
 633
 634         return !!(scc_last_status_reg[channel] & SR_DCD);
 635 }
 636
 637
 638 static void scc_shutdown_port(void *ptr)
 639 {
 640         struct scc_port *port = ptr;
 641
 642         port->gs.flags &= ~ GS_ACTIVE;
 643         if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
 644                 scc_setsignals (port, 0, 0);
 645         }
 646 }
 647
 648
 649 static int scc_set_real_termios (void *ptr)
 650 {
 651         /* the SCC has char sizes 5,7,6,8 in that order! */
 652         static int chsize_map[4] = { 0, 2, 1, 3 };
 653         unsigned cflag, baud, chsize, channel, brgval = 0;
 654         unsigned long flags;
 655         struct scc_port *port = ptr;
 656         SCC_ACCESS_INIT(port);
 657
 658         if (!port->gs.tty || !port->gs.tty->termios) return 0;
 659
 660         channel = port->channel;
 661
 662         if (channel == CHANNEL_A)
 663                 return 0;               /* Settings controlled by boot PROM */
 664
 665         cflag  = port->gs.tty->termios->c_cflag;
 666         baud = port->gs.baud;
 667         chsize = (cflag & CSIZE) >> 4;
 668
 669         if (baud == 0) {
 670                 /* speed == 0 -> drop DTR */
 671                 local_irq_save(flags);
 672                 SCCmod(TX_CTRL_REG, ~TCR_DTR, 0);
 673                 local_irq_restore(flags);
 674                 return 0;
 675         }
 676         else if ((MACH_IS_MVME16x && (baud < 50 || baud > 38400)) ||
 677                  (MACH_IS_MVME147 && (baud < 50 || baud > 19200)) ||
 678                  (MACH_IS_BVME6000 &&(baud < 50 || baud > 76800))) {
 679                 printk(KERN_NOTICE "SCC: Bad speed requested, %d\n", baud);
 680                 return 0;
 681         }
 682
 683         if (cflag & CLOCAL)
 684                 port->gs.flags &= ~ASYNC_CHECK_CD;
 685         else
 686                 port->gs.flags |= ASYNC_CHECK_CD;
 687
 688 #ifdef CONFIG_MVME147_SCC
 689         if (MACH_IS_MVME147)
 690                 brgval = (M147_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
 691 #endif
 692 #ifdef CONFIG_MVME162_SCC
 693         if (MACH_IS_MVME16x)
 694                 brgval = (MVME_SCC_PCLK + baud/2) / (16 * 2 * baud) - 2;
 695 #endif
 696 #ifdef CONFIG_BVME6000_SCC
 697         if (MACH_IS_BVME6000)
 698                 brgval = (BVME_SCC_RTxC + baud/2) / (16 * 2 * baud) - 2;
 699 #endif
 700         /* Now we have all parameters and can go to set them: */
 701         local_irq_save(flags);
 702
 703         /* receiver's character size and auto-enables */
 704         SCCmod(RX_CTRL_REG, ~(RCR_CHSIZE_MASK|RCR_AUTO_ENAB_MODE),
 705                         (chsize_map[chsize] << 6) |
 706                         ((cflag & CRTSCTS) ? RCR_AUTO_ENAB_MODE : 0));
 707         /* parity and stop bits (both, Tx and Rx), clock mode never changes */
 708         SCCmod (AUX1_CTRL_REG,
 709                 ~(A1CR_PARITY_MASK | A1CR_MODE_MASK),
 710                 ((cflag & PARENB
 711                   ? (cflag & PARODD ? A1CR_PARITY_ODD : A1CR_PARITY_EVEN)
 712                   : A1CR_PARITY_NONE)
 713                  | (cflag & CSTOPB ? A1CR_MODE_ASYNC_2 : A1CR_MODE_ASYNC_1)));
 714         /* sender's character size, set DTR for valid baud rate */
 715         SCCmod(TX_CTRL_REG, ~TCR_CHSIZE_MASK, chsize_map[chsize] << 5 | TCR_DTR);
 716         /* clock sources never change */
 717         /* disable BRG before changing the value */
 718         SCCmod(DPLL_CTRL_REG, ~DCR_BRG_ENAB, 0);
 719         /* BRG value */
 720         SCCwrite(TIMER_LOW_REG, brgval & 0xff);
 721         SCCwrite(TIMER_HIGH_REG, (brgval >> 8) & 0xff);
 722         /* BRG enable, and clock source never changes */
 723         SCCmod(DPLL_CTRL_REG, 0xff, DCR_BRG_ENAB);
 724
 725         local_irq_restore(flags);
 726
 727         return 0;
 728 }
 729
 730
 731 static int scc_chars_in_buffer (void *ptr)
 732 {
 733         struct scc_port *port = ptr;
 734         SCC_ACCESS_INIT(port);
 735
 736         return (SCCread (SPCOND_STATUS_REG) & SCSR_ALL_SENT) ? 0  : 1;
 737 }
 738
 739
 740 /* Comment taken from sx.c (2.4.0):
 741    I haven't the foggiest why the decrement use count has to happen
 742    here. The whole linux serial drivers stuff needs to be redesigned.
 743    My guess is that this is a hack to minimize the impact of a bug
 744    elsewhere. Thinking about it some more. (try it sometime) Try
 745    running minicom on a serial port that is driven by a modularized
 746    driver. Have the modem hangup. Then remove the driver module. Then
 747    exit minicom.  I expect an "oops".  -- REW */
 748
 749 static void scc_hungup(void *ptr)
 750 {
 751         scc_disable_tx_interrupts(ptr);
 752         scc_disable_rx_interrupts(ptr);
 753 }
 754
 755
 756 static void scc_close(void *ptr)
 757 {
 758         scc_disable_tx_interrupts(ptr);
 759         scc_disable_rx_interrupts(ptr);
 760 }
 761
 762
 763 /*---------------------------------------------------------------------------
 764  * Internal support functions
 765  *--------------------------------------------------------------------------*/
 766
 767 static void scc_setsignals(struct scc_port *port, int dtr, int rts)
 768 {
 769         unsigned long flags;
 770         unsigned char t;
 771         SCC_ACCESS_INIT(port);
 772
 773         local_irq_save(flags);
 774         t = SCCread(TX_CTRL_REG);
 775         if (dtr >= 0) t = dtr? (t | TCR_DTR): (t & ~TCR_DTR);
 776         if (rts >= 0) t = rts? (t | TCR_RTS): (t & ~TCR_RTS);
 777         SCCwrite(TX_CTRL_REG, t);
 778         local_irq_restore(flags);
 779 }
 780
 781
 782 static void scc_send_xchar(struct tty_struct *tty, char ch)
 783 {
 784         struct scc_port *port = (struct scc_port *)tty->driver_data;
 785
 786         port->x_char = ch;
 787         if (ch)
 788                 scc_enable_tx_interrupts(port);
 789 }
 790
 791
 792 /*---------------------------------------------------------------------------
 793  * Driver entrypoints referenced from above
 794  *--------------------------------------------------------------------------*/
 795
 796 static int scc_open (struct tty_struct * tty, struct file * filp)
 797 {
 798         int line = tty->index;
 799         int retval;
 800         struct scc_port *port = &scc_ports[line];
 801         int i, channel = port->channel;
 802         unsigned long   flags;
 803         SCC_ACCESS_INIT(port);
 804 #if defined(CONFIG_MVME162_SCC) || defined(CONFIG_MVME147_SCC)
 805         static const struct {
 806                 unsigned reg, val;
 807         } mvme_init_tab[] = {
 808                 /* Values for MVME162 and MVME147 */
 809                 /* no parity, 1 stop bit, async, 1:16 */
 810                 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
 811                 /* parity error is special cond, ints disabled, no DMA */
 812                 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
 813                 /* Rx 8 bits/char, no auto enable, Rx off */
 814                 { RX_CTRL_REG, RCR_CHSIZE_8 },
 815                 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
 816                 { TX_CTRL_REG, TCR_CHSIZE_8 },
 817                 /* special features off */
 818                 { AUX2_CTRL_REG, 0 },
 819                 { CLK_CTRL_REG, CCR_RXCLK_BRG | CCR_TXCLK_BRG },
 820                 { DPLL_CTRL_REG, DCR_BRG_ENAB | DCR_BRG_USE_PCLK },
 821                 /* Start Rx */
 822                 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
 823                 /* Start Tx */
 824                 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
 825                 /* Ext/Stat ints: DCD only */
 826                 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
 827                 /* Reset Ext/Stat ints */
 828                 { COMMAND_REG, CR_EXTSTAT_RESET },
 829                 /* ...again */
 830                 { COMMAND_REG, CR_EXTSTAT_RESET },
 831         };
 832 #endif
 833 #if defined(CONFIG_BVME6000_SCC)
 834         static const struct {
 835                 unsigned reg, val;
 836         } bvme_init_tab[] = {
 837                 /* Values for BVME6000 */
 838                 /* no parity, 1 stop bit, async, 1:16 */
 839                 { AUX1_CTRL_REG, A1CR_PARITY_NONE|A1CR_MODE_ASYNC_1|A1CR_CLKMODE_x16 },
 840                 /* parity error is special cond, ints disabled, no DMA */
 841                 { INT_AND_DMA_REG, IDR_PARERR_AS_SPCOND | IDR_RX_INT_DISAB },
 842                 /* Rx 8 bits/char, no auto enable, Rx off */
 843                 { RX_CTRL_REG, RCR_CHSIZE_8 },
 844                 /* DTR off, Tx 8 bits/char, RTS off, Tx off */
 845                 { TX_CTRL_REG, TCR_CHSIZE_8 },
 846                 /* special features off */
 847                 { AUX2_CTRL_REG, 0 },
 848                 { CLK_CTRL_REG, CCR_RTxC_XTAL | CCR_RXCLK_BRG | CCR_TXCLK_BRG },
 849                 { DPLL_CTRL_REG, DCR_BRG_ENAB },
 850                 /* Start Rx */
 851                 { RX_CTRL_REG, RCR_RX_ENAB | RCR_CHSIZE_8 },
 852                 /* Start Tx */
 853                 { TX_CTRL_REG, TCR_TX_ENAB | TCR_RTS | TCR_DTR | TCR_CHSIZE_8 },
 854                 /* Ext/Stat ints: DCD only */
 855                 { INT_CTRL_REG, ICR_ENAB_DCD_INT },
 856                 /* Reset Ext/Stat ints */
 857                 { COMMAND_REG, CR_EXTSTAT_RESET },
 858                 /* ...again */
 859                 { COMMAND_REG, CR_EXTSTAT_RESET },
 860         };
 861 #endif
 862         if (!(port->gs.flags & ASYNC_INITIALIZED)) {
 863                 local_irq_save(flags);
 864 #if defined(CONFIG_MVME147_SCC) || defined(CONFIG_MVME162_SCC)
 865                 if (MACH_IS_MVME147 || MACH_IS_MVME16x) {
 866                         for (i = 0; i < ARRAY_SIZE(mvme_init_tab); ++i)
 867                                 SCCwrite(mvme_init_tab[i].reg, mvme_init_tab[i].val);
 868                 }
 869 #endif
 870 #if defined(CONFIG_BVME6000_SCC)
 871                 if (MACH_IS_BVME6000) {
 872                         for (i = 0; i < ARRAY_SIZE(bvme_init_tab); ++i)
 873                                 SCCwrite(bvme_init_tab[i].reg, bvme_init_tab[i].val);
 874                 }
 875 #endif
 876
 877                 /* remember status register for detection of DCD and CTS changes */
 878                 scc_last_status_reg[channel] = SCCread(STATUS_REG);
 879
 880                 port->c_dcd = 0;        /* Prevent initial 1->0 interrupt */
 881                 scc_setsignals (port, 1,1);
 882                 local_irq_restore(flags);
 883         }
 884
 885         tty->driver_data = port;
 886         port->gs.tty = tty;
 887         port->gs.count++;
 888         retval = gs_init_port(&port->gs);
 889         if (retval) {
 890                 port->gs.count--;
 891                 return retval;
 892         }
 893         port->gs.flags |= GS_ACTIVE;
 894         retval = gs_block_til_ready(port, filp);
 895
 896         if (retval) {
 897                 port->gs.count--;
 898                 return retval;
 899         }
 900
 901         port->c_dcd = scc_get_CD (port);
 902
 903         scc_enable_rx_interrupts(port);
 904
 905         return 0;
 906 }
 907
 908
 909 static void scc_throttle (struct tty_struct * tty)
 910 {
 911         struct scc_port *port = (struct scc_port *)tty->driver_data;
 912         unsigned long   flags;
 913         SCC_ACCESS_INIT(port);
 914
 915         if (tty->termios->c_cflag & CRTSCTS) {
 916                 local_irq_save(flags);
 917                 SCCmod(TX_CTRL_REG, ~TCR_RTS, 0);
 918                 local_irq_restore(flags);
 919         }
 920         if (I_IXOFF(tty))
 921                 scc_send_xchar(tty, STOP_CHAR(tty));
 922 }
 923
 924
 925 static void scc_unthrottle (struct tty_struct * tty)
 926 {
 927         struct scc_port *port = (struct scc_port *)tty->driver_data;
 928         unsigned long   flags;
 929         SCC_ACCESS_INIT(port);
 930
 931         if (tty->termios->c_cflag & CRTSCTS) {
 932                 local_irq_save(flags);
 933                 SCCmod(TX_CTRL_REG, 0xff, TCR_RTS);
 934                 local_irq_restore(flags);
 935         }
 936         if (I_IXOFF(tty))
 937                 scc_send_xchar(tty, START_CHAR(tty));
 938 }
 939
 940
 941 static int scc_ioctl(struct tty_struct *tty, struct file *file,
 942                      unsigned int cmd, unsigned long arg)
 943 {
 944         return -ENOIOCTLCMD;
 945 }
 946
 947
 948 static void scc_break_ctl(struct tty_struct *tty, int break_state)
 949 {
 950         struct scc_port *port = (struct scc_port *)tty->driver_data;
 951         unsigned long   flags;
 952         SCC_ACCESS_INIT(port);
 953
 954         local_irq_save(flags);
 955         SCCmod(TX_CTRL_REG, ~TCR_SEND_BREAK,
 956                         break_state ? TCR_SEND_BREAK : 0);
 957         local_irq_restore(flags);
 958 }
 959
 960
 961 /*---------------------------------------------------------------------------
 962  * Serial console stuff...
 963  *--------------------------------------------------------------------------*/
 964
 965 #define scc_delay() do { __asm__ __volatile__ (" nop; nop"); } while (0)
 966
 967 static void scc_ch_write (char ch)
 968 {
 969         volatile char *p = NULL;
 970
 971 #ifdef CONFIG_MVME147_SCC
 972         if (MACH_IS_MVME147)
 973                 p = (volatile char *)M147_SCC_A_ADDR;
 974 #endif
 975 #ifdef CONFIG_MVME162_SCC
 976         if (MACH_IS_MVME16x)
 977                 p = (volatile char *)MVME_SCC_A_ADDR;
 978 #endif
 979 #ifdef CONFIG_BVME6000_SCC
 980         if (MACH_IS_BVME6000)
 981                 p = (volatile char *)BVME_SCC_A_ADDR;
 982 #endif
 983
 984         do {
 985                 scc_delay();
 986         }
 987         while (!(*p & 4));
 988         scc_delay();
 989         *p = 8;
 990         scc_delay();
 991         *p = ch;
 992 }
 993
 994 /* The console must be locked when we get here. */
 995
 996 static void scc_console_write (struct console *co, const char *str, unsigned count)
 997 {
 998         unsigned long   flags;
 999
1000         local_irq_save(flags);
1001
1002         while (count--)
1003         {
1004                 if (*str == '\n')
1005                         scc_ch_write ('\r');
1006                 scc_ch_write (*str++);
1007         }
1008         local_irq_restore(flags);
1009 }
1010
1011 static struct tty_driver *scc_console_device(struct console *c, int *index)
1012 {
1013         *index = c->index;
1014         return scc_driver;
1015 }
1016
1017
1018 static int __init scc_console_setup(struct console *co, char *options)
1019 {
1020         return 0;
1021 }
1022
1023
1024 static struct console sercons = {
1025         .name           = "ttyS",
1026         .write          = scc_console_write,
1027         .device         = scc_console_device,
1028         .setup          = scc_console_setup,
1029         .flags          = CON_PRINTBUFFER,
1030         .index          = -1,
1031 };
1032
1033
1034 static int __init vme_scc_console_init(void)
1035 {
1036         if (vme_brdtype == VME_TYPE_MVME147 ||
1037                         vme_brdtype == VME_TYPE_MVME162 ||
1038                         vme_brdtype == VME_TYPE_MVME172 ||
1039                         vme_brdtype == VME_TYPE_BVME4000 ||
1040                         vme_brdtype == VME_TYPE_BVME6000)
1041                 register_console(&sercons);
1042         return 0;
1043 }
1044 console_initcall(vme_scc_console_init);