drivers/char/serial167.c

   1 /*
   2  * linux/drivers/char/serial167.c
   3  *
   4  * Driver for MVME166/7 board serial ports, which are via a CD2401.
   5  * Based very much on cyclades.c.
   6  *
   7  * MVME166/7 work by Richard Hirst [richard@sleepie.demon.co.uk]
   8  *
   9  * ==============================================================
  10  *
  11  * static char rcsid[] =
  12  * "$Revision: 1.36.1.4 $$Date: 1995/03/29 06:14:14 $";
  13  *
  14  *  linux/kernel/cyclades.c
  15  *
  16  * Maintained by Marcio Saito (cyclades@netcom.com) and
  17  * Randolph Bentson (bentson@grieg.seaslug.org)
  18  *
  19  * Much of the design and some of the code came from serial.c
  20  * which was copyright (C) 1991, 1992  Linus Torvalds.  It was
  21  * extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92,
  22  * and then fixed as suggested by Michael K. Johnson 12/12/92.
  23  *
  24  * This version does not support shared irq's.
  25  *
  26  * $Log: cyclades.c,v $
  27  * Revision 1.36.1.4  1995/03/29  06:14:14  bentson
  28  * disambiguate between Cyclom-16Y and Cyclom-32Ye;
  29  *
  30  * Changes:
  31  *
  32  * 200 lines of changes record removed - RGH 11-10-95, starting work on
  33  * converting this to drive serial ports on mvme166 (cd2401).
  34  *
  35  * Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 2000/08/25
  36  * - get rid of verify_area
  37  * - use get_user to access memory from userspace in set_threshold,
  38  *   set_default_threshold and set_timeout
  39  * - don't use the panic function in serial167_init
  40  * - do resource release on failure on serial167_init
  41  * - include missing restore_flags in mvme167_serial_console_setup
  42  *
  43  * Kars de Jong <jongk@linux-m68k.org> - 2004/09/06
  44  * - replace bottom half handler with task queue handler
  45  */
  46
  47 #include <linux/errno.h>
  48 #include <linux/signal.h>
  49 #include <linux/sched.h>
  50 #include <linux/timer.h>
  51 #include <linux/tty.h>
  52 #include <linux/interrupt.h>
  53 #include <linux/serial.h>
  54 #include <linux/serialP.h>
  55 #include <linux/string.h>
  56 #include <linux/fcntl.h>
  57 #include <linux/ptrace.h>
  58 #include <linux/serial167.h>
  59 #include <linux/delay.h>
  60 #include <linux/major.h>
  61 #include <linux/mm.h>
  62 #include <linux/console.h>
  63 #include <linux/module.h>
  64 #include <linux/bitops.h>
  65 #include <linux/tty_flip.h>
  66
  67 #include <asm/system.h>
  68 #include <asm/io.h>
  69 #include <asm/mvme16xhw.h>
  70 #include <asm/bootinfo.h>
  71 #include <asm/setup.h>
  72
  73 #include <linux/types.h>
  74 #include <linux/kernel.h>
  75
  76 #include <asm/uaccess.h>
  77 #include <linux/init.h>
  78
  79 #define SERIAL_PARANOIA_CHECK
  80 #undef  SERIAL_DEBUG_OPEN
  81 #undef  SERIAL_DEBUG_THROTTLE
  82 #undef  SERIAL_DEBUG_OTHER
  83 #undef  SERIAL_DEBUG_IO
  84 #undef  SERIAL_DEBUG_COUNT
  85 #undef  SERIAL_DEBUG_DTR
  86 #undef  CYCLOM_16Y_HACK
  87 #define  CYCLOM_ENABLE_MONITORING
  88
  89 #define WAKEUP_CHARS 256
  90
  91 #define STD_COM_FLAGS (0)
  92
  93 static struct tty_driver *cy_serial_driver;
  94 extern int serial_console;
  95 static struct cyclades_port *serial_console_info = NULL;
  96 static unsigned int serial_console_cflag = 0;
  97 u_char initial_console_speed;
  98
  99 /* Base address of cd2401 chip on mvme166/7 */
 100
 101 #define BASE_ADDR (0xfff45000)
 102 #define pcc2chip        ((volatile u_char *)0xfff42000)
 103 #define PccSCCMICR      0x1d
 104 #define PccSCCTICR      0x1e
 105 #define PccSCCRICR      0x1f
 106 #define PccTPIACKR      0x25
 107 #define PccRPIACKR      0x27
 108 #define PccIMLR         0x3f
 109
 110 /* This is the per-port data structure */
 111 struct cyclades_port cy_port[] = {
 112         /* CARD#  */
 113         {-1},                   /* ttyS0 */
 114         {-1},                   /* ttyS1 */
 115         {-1},                   /* ttyS2 */
 116         {-1},                   /* ttyS3 */
 117 };
 118
 119 #define NR_PORTS        ARRAY_SIZE(cy_port)
 120
 121 /*
 122  * This is used to look up the divisor speeds and the timeouts
 123  * We're normally limited to 15 distinct baud rates.  The extra
 124  * are accessed via settings in info->flags.
 125  *         0,     1,     2,     3,     4,     5,     6,     7,     8,     9,
 126  *        10,    11,    12,    13,    14,    15,    16,    17,    18,    19,
 127  *                                                  HI            VHI
 128  */
 129 static int baud_table[] = {
 130         0, 50, 75, 110, 134, 150, 200, 300, 600, 1200,
 131         1800, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200, 150000,
 132         0
 133 };
 134
 135 #if 0
 136 static char baud_co[] = {       /* 25 MHz clock option table */
 137         /* value =>    00    01   02    03    04 */
 138         /* divide by    8    32   128   512  2048 */
 139         0x00, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x02,
 140         0x02, 0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 141 };
 142
 143 static char baud_bpr[] = {      /* 25 MHz baud rate period table */
 144         0x00, 0xf5, 0xa3, 0x6f, 0x5c, 0x51, 0xf5, 0xa3, 0x51, 0xa3,
 145         0x6d, 0x51, 0xa3, 0x51, 0xa3, 0x51, 0x36, 0x29, 0x1b, 0x15
 146 };
 147 #endif
 148
 149 /* I think 166 brd clocks 2401 at 20MHz.... */
 150
 151 /* These values are written directly to tcor, and >> 5 for writing to rcor */
 152 static u_char baud_co[] = {     /* 20 MHz clock option table */
 153         0x00, 0x80, 0x80, 0x80, 0x80, 0x80, 0x80, 0x60, 0x60, 0x40,
 154         0x40, 0x40, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
 155 };
 156
 157 /* These values written directly to tbpr/rbpr */
 158 static u_char baud_bpr[] = {    /* 20 MHz baud rate period table */
 159         0x00, 0xc0, 0x80, 0x58, 0x6c, 0x40, 0xc0, 0x81, 0x40, 0x81,
 160         0x57, 0x40, 0x81, 0x40, 0x81, 0x40, 0x2b, 0x20, 0x15, 0x10
 161 };
 162
 163 static u_char baud_cor4[] = {   /* receive threshold */
 164         0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a,
 165         0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x08, 0x08, 0x07
 166 };
 167
 168 static void shutdown(struct cyclades_port *);
 169 static int startup(struct cyclades_port *);
 170 static void cy_throttle(struct tty_struct *);
 171 static void cy_unthrottle(struct tty_struct *);
 172 static void config_setup(struct cyclades_port *);
 173 extern void console_print(const char *);
 174 #ifdef CYCLOM_SHOW_STATUS
 175 static void show_status(int);
 176 #endif
 177
 178 #ifdef CONFIG_REMOTE_DEBUG
 179 static void debug_setup(void);
 180 void queueDebugChar(int c);
 181 int getDebugChar(void);
 182
 183 #define DEBUG_PORT      1
 184 #define DEBUG_LEN       256
 185
 186 typedef struct {
 187         int in;
 188         int out;
 189         unsigned char buf[DEBUG_LEN];
 190 } debugq;
 191
 192 debugq debugiq;
 193 #endif
 194
 195 /*
 196  * I have my own version of udelay(), as it is needed when initialising
 197  * the chip, before the delay loop has been calibrated.  Should probably
 198  * reference one of the vmechip2 or pccchip2 counter for an accurate
 199  * delay, but this wild guess will do for now.
 200  */
 201
 202 void my_udelay(long us)
 203 {
 204         u_char x;
 205         volatile u_char *p = &x;
 206         int i;
 207
 208         while (us--)
 209                 for (i = 100; i; i--)
 210                         x |= *p;
 211 }
 212
 213 static inline int serial_paranoia_check(struct cyclades_port *info, char *name,
 214                 const char *routine)
 215 {
 216 #ifdef SERIAL_PARANOIA_CHECK
 217         if (!info) {
 218                 printk("Warning: null cyclades_port for (%s) in %s\n", name,
 219                                 routine);
 220                 return 1;
 221         }
 222
 223         if ((long)info < (long)(&cy_port[0])
 224             || (long)(&cy_port[NR_PORTS]) < (long)info) {
 225                 printk("Warning: cyclades_port out of range for (%s) in %s\n",
 226                                 name, routine);
 227                 return 1;
 228         }
 229
 230         if (info->magic != CYCLADES_MAGIC) {
 231                 printk("Warning: bad magic number for serial struct (%s) in "
 232                                 "%s\n", name, routine);
 233                 return 1;
 234         }
 235 #endif
 236         return 0;
 237 }                               /* serial_paranoia_check */
 238
 239 #if 0
 240 /* The following diagnostic routines allow the driver to spew
 241    information on the screen, even (especially!) during interrupts.
 242  */
 243 void SP(char *data)
 244 {
 245         unsigned long flags;
 246         local_irq_save(flags);
 247         console_print(data);
 248         local_irq_restore(flags);
 249 }
 250
 251 char scrn[2];
 252 void CP(char data)
 253 {
 254         unsigned long flags;
 255         local_irq_save(flags);
 256         scrn[0] = data;
 257         console_print(scrn);
 258         local_irq_restore(flags);
 259 }                               /* CP */
 260
 261 void CP1(int data)
 262 {
 263         (data < 10) ? CP(data + '0') : CP(data + 'A' - 10);
 264 }                               /* CP1 */
 265 void CP2(int data)
 266 {
 267         CP1((data >> 4) & 0x0f);
 268         CP1(data & 0x0f);
 269 }                               /* CP2 */
 270 void CP4(int data)
 271 {
 272         CP2((data >> 8) & 0xff);
 273         CP2(data & 0xff);
 274 }                               /* CP4 */
 275 void CP8(long data)
 276 {
 277         CP4((data >> 16) & 0xffff);
 278         CP4(data & 0xffff);
 279 }                               /* CP8 */
 280 #endif
 281
 282 /* This routine waits up to 1000 micro-seconds for the previous
 283    command to the Cirrus chip to complete and then issues the
 284    new command.  An error is returned if the previous command
 285    didn't finish within the time limit.
 286  */
 287 u_short write_cy_cmd(volatile u_char * base_addr, u_char cmd)
 288 {
 289         unsigned long flags;
 290         volatile int i;
 291
 292         local_irq_save(flags);
 293         /* Check to see that the previous command has completed */
 294         for (i = 0; i < 100; i++) {
 295                 if (base_addr[CyCCR] == 0) {
 296                         break;
 297                 }
 298                 my_udelay(10L);
 299         }
 300         /* if the CCR never cleared, the previous command
 301            didn't finish within the "reasonable time" */
 302         if (i == 10) {
 303                 local_irq_restore(flags);
 304                 return (-1);
 305         }
 306
 307         /* Issue the new command */
 308         base_addr[CyCCR] = cmd;
 309         local_irq_restore(flags);
 310         return (0);
 311 }                               /* write_cy_cmd */
 312
 313 /* cy_start and cy_stop provide software output flow control as a
 314    function of XON/XOFF, software CTS, and other such stuff. */
 315
 316 static void cy_stop(struct tty_struct *tty)
 317 {
 318         struct cyclades_port *info = tty->driver_data;
 319         volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
 320         int channel;
 321         unsigned long flags;
 322
 323 #ifdef SERIAL_DEBUG_OTHER
 324         printk("cy_stop %s\n", tty->name);      /* */
 325 #endif
 326
 327         if (serial_paranoia_check(info, tty->name, "cy_stop"))
 328                 return;
 329
 330         channel = info->line;
 331
 332         local_irq_save(flags);
 333         base_addr[CyCAR] = (u_char) (channel);  /* index channel */
 334         base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
 335         local_irq_restore(flags);
 336 }                               /* cy_stop */
 337
 338 static void cy_start(struct tty_struct *tty)
 339 {
 340         struct cyclades_port *info = tty->driver_data;
 341         volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
 342         int channel;
 343         unsigned long flags;
 344
 345 #ifdef SERIAL_DEBUG_OTHER
 346         printk("cy_start %s\n", tty->name);     /* */
 347 #endif
 348
 349         if (serial_paranoia_check(info, tty->name, "cy_start"))
 350                 return;
 351
 352         channel = info->line;
 353
 354         local_irq_save(flags);
 355         base_addr[CyCAR] = (u_char) (channel);
 356         base_addr[CyIER] |= CyTxMpty;
 357         local_irq_restore(flags);
 358 }                               /* cy_start */
 359
 360 /* The real interrupt service routines are called
 361    whenever the card wants its hand held--chars
 362    received, out buffer empty, modem change, etc.
 363  */
 364 static irqreturn_t cd2401_rxerr_interrupt(int irq, void *dev_id)
 365 {
 366         struct tty_struct *tty;
 367         struct cyclades_port *info;
 368         volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
 369         unsigned char err, rfoc;
 370         int channel;
 371         char data;
 372
 373         /* determine the channel and change to that context */
 374         channel = (u_short) (base_addr[CyLICR] >> 2);
 375         info = &cy_port[channel];
 376         info->last_active = jiffies;
 377
 378         if ((err = base_addr[CyRISR]) & CyTIMEOUT) {
 379                 /* This is a receive timeout interrupt, ignore it */
 380                 base_addr[CyREOIR] = CyNOTRANS;
 381                 return IRQ_HANDLED;
 382         }
 383
 384         /* Read a byte of data if there is any - assume the error
 385          * is associated with this character */
 386
 387         if ((rfoc = base_addr[CyRFOC]) != 0)
 388                 data = base_addr[CyRDR];
 389         else
 390                 data = 0;
 391
 392         /* if there is nowhere to put the data, discard it */
 393         if (info->tty == 0) {
 394                 base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
 395                 return IRQ_HANDLED;
 396         } else {                /* there is an open port for this data */
 397                 tty = info->tty;
 398                 if (err & info->ignore_status_mask) {
 399                         base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
 400                         return IRQ_HANDLED;
 401                 }
 402                 if (tty_buffer_request_room(tty, 1) != 0) {
 403                         if (err & info->read_status_mask) {
 404                                 if (err & CyBREAK) {
 405                                         tty_insert_flip_char(tty, data,
 406                                                              TTY_BREAK);
 407                                         if (info->flags & ASYNC_SAK) {
 408                                                 do_SAK(tty);
 409                                         }
 410                                 } else if (err & CyFRAME) {
 411                                         tty_insert_flip_char(tty, data,
 412                                                              TTY_FRAME);
 413                                 } else if (err & CyPARITY) {
 414                                         tty_insert_flip_char(tty, data,
 415                                                              TTY_PARITY);
 416                                 } else if (err & CyOVERRUN) {
 417                                         tty_insert_flip_char(tty, 0,
 418                                                              TTY_OVERRUN);
 419                                         /*
 420                                            If the flip buffer itself is
 421                                            overflowing, we still lose
 422                                            the next incoming character.
 423                                          */
 424                                         if (tty_buffer_request_room(tty, 1) !=
 425                                             0) {
 426                                                 tty_insert_flip_char(tty, data,
 427                                                                      TTY_FRAME);
 428                                         }
 429                                         /* These two conditions may imply */
 430                                         /* a normal read should be done. */
 431                                         /* else if(data & CyTIMEOUT) */
 432                                         /* else if(data & CySPECHAR) */
 433                                 } else {
 434                                         tty_insert_flip_char(tty, 0,
 435                                                              TTY_NORMAL);
 436                                 }
 437                         } else {
 438                                 tty_insert_flip_char(tty, data, TTY_NORMAL);
 439                         }
 440                 } else {
 441                         /* there was a software buffer overrun
 442                            and nothing could be done about it!!! */
 443                 }
 444         }
 445         tty_schedule_flip(tty);
 446         /* end of service */
 447         base_addr[CyREOIR] = rfoc ? 0 : CyNOTRANS;
 448         return IRQ_HANDLED;
 449 }                               /* cy_rxerr_interrupt */
 450
 451 static irqreturn_t cd2401_modem_interrupt(int irq, void *dev_id)
 452 {
 453         struct cyclades_port *info;
 454         volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
 455         int channel;
 456         int mdm_change;
 457         int mdm_status;
 458
 459         /* determine the channel and change to that context */
 460         channel = (u_short) (base_addr[CyLICR] >> 2);
 461         info = &cy_port[channel];
 462         info->last_active = jiffies;
 463
 464         mdm_change = base_addr[CyMISR];
 465         mdm_status = base_addr[CyMSVR1];
 466
 467         if (info->tty == 0) {   /* nowhere to put the data, ignore it */
 468                 ;
 469         } else {
 470                 if ((mdm_change & CyDCD)
 471                     && (info->flags & ASYNC_CHECK_CD)) {
 472                         if (mdm_status & CyDCD) {
 473 /* CP('!'); */
 474                                 wake_up_interruptible(&info->open_wait);
 475                         } else {
 476 /* CP('@'); */
 477                                 tty_hangup(info->tty);
 478                                 wake_up_interruptible(&info->open_wait);
 479                                 info->flags &= ~ASYNC_NORMAL_ACTIVE;
 480                         }
 481                 }
 482                 if ((mdm_change & CyCTS)
 483                     && (info->flags & ASYNC_CTS_FLOW)) {
 484                         if (info->tty->stopped) {
 485                                 if (mdm_status & CyCTS) {
 486                                         /* !!! cy_start isn't used because... */
 487                                         info->tty->stopped = 0;
 488                                         base_addr[CyIER] |= CyTxMpty;
 489                                         tty_wakeup(info->tty);
 490                                 }
 491                         } else {
 492                                 if (!(mdm_status & CyCTS)) {
 493                                         /* !!! cy_stop isn't used because... */
 494                                         info->tty->stopped = 1;
 495                                         base_addr[CyIER] &=
 496                                             ~(CyTxMpty | CyTxRdy);
 497                                 }
 498                         }
 499                 }
 500                 if (mdm_status & CyDSR) {
 501                 }
 502         }
 503         base_addr[CyMEOIR] = 0;
 504         return IRQ_HANDLED;
 505 }                               /* cy_modem_interrupt */
 506
 507 static irqreturn_t cd2401_tx_interrupt(int irq, void *dev_id)
 508 {
 509         struct cyclades_port *info;
 510         volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
 511         int channel;
 512         int char_count, saved_cnt;
 513         int outch;
 514
 515         /* determine the channel and change to that context */
 516         channel = (u_short) (base_addr[CyLICR] >> 2);
 517
 518 #ifdef CONFIG_REMOTE_DEBUG
 519         if (channel == DEBUG_PORT) {
 520                 panic("TxInt on debug port!!!");
 521         }
 522 #endif
 523
 524         info = &cy_port[channel];
 525
 526         /* validate the port number (as configured and open) */
 527         if ((channel < 0) || (NR_PORTS <= channel)) {
 528                 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
 529                 base_addr[CyTEOIR] = CyNOTRANS;
 530                 return IRQ_HANDLED;
 531         }
 532         info->last_active = jiffies;
 533         if (info->tty == 0) {
 534                 base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
 535                 base_addr[CyTEOIR] = CyNOTRANS;
 536                 return IRQ_HANDLED;
 537         }
 538
 539         /* load the on-chip space available for outbound data */
 540         saved_cnt = char_count = base_addr[CyTFTC];
 541
 542         if (info->x_char) {     /* send special char */
 543                 outch = info->x_char;
 544                 base_addr[CyTDR] = outch;
 545                 char_count--;
 546                 info->x_char = 0;
 547         }
 548
 549         if (info->x_break) {
 550                 /*  The Cirrus chip requires the "Embedded Transmit
 551                    Commands" of start break, delay, and end break
 552                    sequences to be sent.  The duration of the
 553                    break is given in TICs, which runs at HZ
 554                    (typically 100) and the PPR runs at 200 Hz,
 555                    so the delay is duration * 200/HZ, and thus a
 556                    break can run from 1/100 sec to about 5/4 sec.
 557                    Need to check these values - RGH 141095.
 558                  */
 559                 base_addr[CyTDR] = 0;   /* start break */
 560                 base_addr[CyTDR] = 0x81;
 561                 base_addr[CyTDR] = 0;   /* delay a bit */
 562                 base_addr[CyTDR] = 0x82;
 563                 base_addr[CyTDR] = info->x_break * 200 / HZ;
 564                 base_addr[CyTDR] = 0;   /* terminate break */
 565                 base_addr[CyTDR] = 0x83;
 566                 char_count -= 7;
 567                 info->x_break = 0;
 568         }
 569
 570         while (char_count > 0) {
 571                 if (!info->xmit_cnt) {
 572                         base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
 573                         break;
 574                 }
 575                 if (info->xmit_buf == 0) {
 576                         base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
 577                         break;
 578                 }
 579                 if (info->tty->stopped || info->tty->hw_stopped) {
 580                         base_addr[CyIER] &= ~(CyTxMpty | CyTxRdy);
 581                         break;
 582                 }
 583                 /* Because the Embedded Transmit Commands have been
 584                    enabled, we must check to see if the escape
 585                    character, NULL, is being sent.  If it is, we
 586                    must ensure that there is room for it to be
 587                    doubled in the output stream.  Therefore we
 588                    no longer advance the pointer when the character
 589                    is fetched, but rather wait until after the check
 590                    for a NULL output character. (This is necessary
 591                    because there may not be room for the two chars
 592                    needed to send a NULL.
 593                  */
 594                 outch = info->xmit_buf[info->xmit_tail];
 595                 if (outch) {
 596                         info->xmit_cnt--;
 597                         info->xmit_tail = (info->xmit_tail + 1)
 598                             & (PAGE_SIZE - 1);
 599                         base_addr[CyTDR] = outch;
 600                         char_count--;
 601                 } else {
 602                         if (char_count > 1) {
 603                                 info->xmit_cnt--;
 604                                 info->xmit_tail = (info->xmit_tail + 1)
 605                                     & (PAGE_SIZE - 1);
 606                                 base_addr[CyTDR] = outch;
 607                                 base_addr[CyTDR] = 0;
 608                                 char_count--;
 609                                 char_count--;
 610                         } else {
 611                                 break;
 612                         }
 613                 }
 614         }
 615
 616         if (info->xmit_cnt < WAKEUP_CHARS)
 617                 tty_wakeup(info->tty);
 618
 619         base_addr[CyTEOIR] = (char_count != saved_cnt) ? 0 : CyNOTRANS;
 620         return IRQ_HANDLED;
 621 }                               /* cy_tx_interrupt */
 622
 623 static irqreturn_t cd2401_rx_interrupt(int irq, void *dev_id)
 624 {
 625         struct tty_struct *tty;
 626         struct cyclades_port *info;
 627         volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
 628         int channel;
 629         char data;
 630         int char_count;
 631         int save_cnt;
 632         int len;
 633
 634         /* determine the channel and change to that context */
 635         channel = (u_short) (base_addr[CyLICR] >> 2);
 636         info = &cy_port[channel];
 637         info->last_active = jiffies;
 638         save_cnt = char_count = base_addr[CyRFOC];
 639
 640 #ifdef CONFIG_REMOTE_DEBUG
 641         if (channel == DEBUG_PORT) {
 642                 while (char_count--) {
 643                         data = base_addr[CyRDR];
 644                         queueDebugChar(data);
 645                 }
 646         } else
 647 #endif
 648                 /* if there is nowhere to put the data, discard it */
 649         if (info->tty == 0) {
 650                 while (char_count--) {
 651                         data = base_addr[CyRDR];
 652                 }
 653         } else {                /* there is an open port for this data */
 654                 tty = info->tty;
 655                 /* load # characters available from the chip */
 656
 657 #ifdef CYCLOM_ENABLE_MONITORING
 658                 ++info->mon.int_count;
 659                 info->mon.char_count += char_count;
 660                 if (char_count > info->mon.char_max)
 661                         info->mon.char_max = char_count;
 662                 info->mon.char_last = char_count;
 663 #endif
 664                 len = tty_buffer_request_room(tty, char_count);
 665                 while (len--) {
 666                         data = base_addr[CyRDR];
 667                         tty_insert_flip_char(tty, data, TTY_NORMAL);
 668 #ifdef CYCLOM_16Y_HACK
 669                         udelay(10L);
 670 #endif
 671                 }
 672                 tty_schedule_flip(tty);
 673         }
 674         /* end of service */
 675         base_addr[CyREOIR] = save_cnt ? 0 : CyNOTRANS;
 676         return IRQ_HANDLED;
 677 }                               /* cy_rx_interrupt */
 678
 679 /* This is called whenever a port becomes active;
 680    interrupts are enabled and DTR & RTS are turned on.
 681  */
 682 static int startup(struct cyclades_port *info)
 683 {
 684         unsigned long flags;
 685         volatile unsigned char *base_addr = (unsigned char *)BASE_ADDR;
 686         int channel;
 687
 688         if (info->flags & ASYNC_INITIALIZED) {
 689                 return 0;
 690         }
 691
 692         if (!info->type) {
 693                 if (info->tty) {
 694                         set_bit(TTY_IO_ERROR, &info->tty->flags);
 695                 }
 696                 return 0;
 697         }
 698         if (!info->xmit_buf) {
 699                 info->xmit_buf = (unsigned char *)get_zeroed_page(GFP_KERNEL);
 700                 if (!info->xmit_buf) {
 701                         return -ENOMEM;
 702                 }
 703         }
 704
 705         config_setup(info);
 706
 707         channel = info->line;
 708
 709 #ifdef SERIAL_DEBUG_OPEN
 710         printk("startup channel %d\n", channel);
 711 #endif
 712
 713         local_irq_save(flags);
 714         base_addr[CyCAR] = (u_char) channel;
 715         write_cy_cmd(base_addr, CyENB_RCVR | CyENB_XMTR);
 716
 717         base_addr[CyCAR] = (u_char) channel;    /* !!! Is this needed? */
 718         base_addr[CyMSVR1] = CyRTS;
 719 /* CP('S');CP('1'); */
 720         base_addr[CyMSVR2] = CyDTR;
 721
 722 #ifdef SERIAL_DEBUG_DTR
 723         printk("cyc: %d: raising DTR\n", __LINE__);
 724         printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
 725                base_addr[CyMSVR2]);
 726 #endif
 727
 728         base_addr[CyIER] |= CyRxData;
 729         info->flags |= ASYNC_INITIALIZED;
 730
 731         if (info->tty) {
 732                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
 733         }
 734         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
 735
 736         local_irq_restore(flags);
 737
 738 #ifdef SERIAL_DEBUG_OPEN
 739         printk(" done\n");
 740 #endif
 741         return 0;
 742 }                               /* startup */
 743
 744 void start_xmit(struct cyclades_port *info)
 745 {
 746         unsigned long flags;
 747         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
 748         int channel;
 749
 750         channel = info->line;
 751         local_irq_save(flags);
 752         base_addr[CyCAR] = channel;
 753         base_addr[CyIER] |= CyTxMpty;
 754         local_irq_restore(flags);
 755 }                               /* start_xmit */
 756
 757 /*
 758  * This routine shuts down a serial port; interrupts are disabled,
 759  * and DTR is dropped if the hangup on close termio flag is on.
 760  */
 761 static void shutdown(struct cyclades_port *info)
 762 {
 763         unsigned long flags;
 764         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
 765         int channel;
 766
 767         if (!(info->flags & ASYNC_INITIALIZED)) {
 768 /* CP('$'); */
 769                 return;
 770         }
 771
 772         channel = info->line;
 773
 774 #ifdef SERIAL_DEBUG_OPEN
 775         printk("shutdown channel %d\n", channel);
 776 #endif
 777
 778         /* !!! REALLY MUST WAIT FOR LAST CHARACTER TO BE
 779            SENT BEFORE DROPPING THE LINE !!!  (Perhaps
 780            set some flag that is read when XMTY happens.)
 781            Other choices are to delay some fixed interval
 782            or schedule some later processing.
 783          */
 784         local_irq_save(flags);
 785         if (info->xmit_buf) {
 786                 free_page((unsigned long)info->xmit_buf);
 787                 info->xmit_buf = NULL;
 788         }
 789
 790         base_addr[CyCAR] = (u_char) channel;
 791         if (!info->tty || (info->tty->termios->c_cflag & HUPCL)) {
 792                 base_addr[CyMSVR1] = 0;
 793 /* CP('C');CP('1'); */
 794                 base_addr[CyMSVR2] = 0;
 795 #ifdef SERIAL_DEBUG_DTR
 796                 printk("cyc: %d: dropping DTR\n", __LINE__);
 797                 printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
 798                        base_addr[CyMSVR2]);
 799 #endif
 800         }
 801         write_cy_cmd(base_addr, CyDIS_RCVR);
 802         /* it may be appropriate to clear _XMIT at
 803            some later date (after testing)!!! */
 804
 805         if (info->tty) {
 806                 set_bit(TTY_IO_ERROR, &info->tty->flags);
 807         }
 808         info->flags &= ~ASYNC_INITIALIZED;
 809         local_irq_restore(flags);
 810
 811 #ifdef SERIAL_DEBUG_OPEN
 812         printk(" done\n");
 813 #endif
 814 }                               /* shutdown */
 815
 816 /*
 817  * This routine finds or computes the various line characteristics.
 818  */
 819 static void config_setup(struct cyclades_port *info)
 820 {
 821         unsigned long flags;
 822         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
 823         int channel;
 824         unsigned cflag;
 825         int i;
 826         unsigned char ti, need_init_chan = 0;
 827
 828         if (!info->tty || !info->tty->termios) {
 829                 return;
 830         }
 831         if (info->line == -1) {
 832                 return;
 833         }
 834         cflag = info->tty->termios->c_cflag;
 835
 836         /* baud rate */
 837         i = cflag & CBAUD;
 838 #ifdef CBAUDEX
 839 /* Starting with kernel 1.1.65, there is direct support for
 840    higher baud rates.  The following code supports those
 841    changes.  The conditional aspect allows this driver to be
 842    used for earlier as well as later kernel versions.  (The
 843    mapping is slightly different from serial.c because there
 844    is still the possibility of supporting 75 kbit/sec with
 845    the Cyclades board.)
 846  */
 847         if (i & CBAUDEX) {
 848                 if (i == B57600)
 849                         i = 16;
 850                 else if (i == B115200)
 851                         i = 18;
 852 #ifdef B78600
 853                 else if (i == B78600)
 854                         i = 17;
 855 #endif
 856                 else
 857                         info->tty->termios->c_cflag &= ~CBAUDEX;
 858         }
 859 #endif
 860         if (i == 15) {
 861                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
 862                         i += 1;
 863                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
 864                         i += 3;
 865         }
 866         /* Don't ever change the speed of the console port.  It will
 867          * run at the speed specified in bootinfo, or at 19.2K */
 868         /* Actually, it should run at whatever speed 166Bug was using */
 869         /* Note info->timeout isn't used at present */
 870         if (info != serial_console_info) {
 871                 info->tbpr = baud_bpr[i];       /* Tx BPR */
 872                 info->tco = baud_co[i]; /* Tx CO */
 873                 info->rbpr = baud_bpr[i];       /* Rx BPR */
 874                 info->rco = baud_co[i] >> 5;    /* Rx CO */
 875                 if (baud_table[i] == 134) {
 876                         info->timeout =
 877                             (info->xmit_fifo_size * HZ * 30 / 269) + 2;
 878                         /* get it right for 134.5 baud */
 879                 } else if (baud_table[i]) {
 880                         info->timeout =
 881                             (info->xmit_fifo_size * HZ * 15 / baud_table[i]) +
 882                             2;
 883                         /* this needs to be propagated into the card info */
 884                 } else {
 885                         info->timeout = 0;
 886                 }
 887         }
 888         /* By tradition (is it a standard?) a baud rate of zero
 889            implies the line should be/has been closed.  A bit
 890            later in this routine such a test is performed. */
 891
 892         /* byte size and parity */
 893         info->cor7 = 0;
 894         info->cor6 = 0;
 895         info->cor5 = 0;
 896         info->cor4 = (info->default_threshold ? info->default_threshold : baud_cor4[i]);        /* receive threshold */
 897         /* Following two lines added 101295, RGH. */
 898         /* It is obviously wrong to access CyCORx, and not info->corx here,
 899          * try and remember to fix it later! */
 900         channel = info->line;
 901         base_addr[CyCAR] = (u_char) channel;
 902         if (C_CLOCAL(info->tty)) {
 903                 if (base_addr[CyIER] & CyMdmCh)
 904                         base_addr[CyIER] &= ~CyMdmCh;   /* without modem intr */
 905                 /* ignore 1->0 modem transitions */
 906                 if (base_addr[CyCOR4] & (CyDSR | CyCTS | CyDCD))
 907                         base_addr[CyCOR4] &= ~(CyDSR | CyCTS | CyDCD);
 908                 /* ignore 0->1 modem transitions */
 909                 if (base_addr[CyCOR5] & (CyDSR | CyCTS | CyDCD))
 910                         base_addr[CyCOR5] &= ~(CyDSR | CyCTS | CyDCD);
 911         } else {
 912                 if ((base_addr[CyIER] & CyMdmCh) != CyMdmCh)
 913                         base_addr[CyIER] |= CyMdmCh;    /* with modem intr */
 914                 /* act on 1->0 modem transitions */
 915                 if ((base_addr[CyCOR4] & (CyDSR | CyCTS | CyDCD)) !=
 916                     (CyDSR | CyCTS | CyDCD))
 917                         base_addr[CyCOR4] |= CyDSR | CyCTS | CyDCD;
 918                 /* act on 0->1 modem transitions */
 919                 if ((base_addr[CyCOR5] & (CyDSR | CyCTS | CyDCD)) !=
 920                     (CyDSR | CyCTS | CyDCD))
 921                         base_addr[CyCOR5] |= CyDSR | CyCTS | CyDCD;
 922         }
 923         info->cor3 = (cflag & CSTOPB) ? Cy_2_STOP : Cy_1_STOP;
 924         info->cor2 = CyETC;
 925         switch (cflag & CSIZE) {
 926         case CS5:
 927                 info->cor1 = Cy_5_BITS;
 928                 break;
 929         case CS6:
 930                 info->cor1 = Cy_6_BITS;
 931                 break;
 932         case CS7:
 933                 info->cor1 = Cy_7_BITS;
 934                 break;
 935         case CS8:
 936                 info->cor1 = Cy_8_BITS;
 937                 break;
 938         }
 939         if (cflag & PARENB) {
 940                 if (cflag & PARODD) {
 941                         info->cor1 |= CyPARITY_O;
 942                 } else {
 943                         info->cor1 |= CyPARITY_E;
 944                 }
 945         } else {
 946                 info->cor1 |= CyPARITY_NONE;
 947         }
 948
 949         /* CTS flow control flag */
 950 #if 0
 951         /* Don't complcate matters for now! RGH 141095 */
 952         if (cflag & CRTSCTS) {
 953                 info->flags |= ASYNC_CTS_FLOW;
 954                 info->cor2 |= CyCtsAE;
 955         } else {
 956                 info->flags &= ~ASYNC_CTS_FLOW;
 957                 info->cor2 &= ~CyCtsAE;
 958         }
 959 #endif
 960         if (cflag & CLOCAL)
 961                 info->flags &= ~ASYNC_CHECK_CD;
 962         else
 963                 info->flags |= ASYNC_CHECK_CD;
 964
 965      /***********************************************
 966         The hardware option, CyRtsAO, presents RTS when
 967         the chip has characters to send.  Since most modems
 968         use RTS as reverse (inbound) flow control, this
 969         option is not used.  If inbound flow control is
 970         necessary, DTR can be programmed to provide the
 971         appropriate signals for use with a non-standard
 972         cable.  Contact Marcio Saito for details.
 973      ***********************************************/
 974
 975         channel = info->line;
 976
 977         local_irq_save(flags);
 978         base_addr[CyCAR] = (u_char) channel;
 979
 980         /* CyCMR set once only in mvme167_init_serial() */
 981         if (base_addr[CyLICR] != channel << 2)
 982                 base_addr[CyLICR] = channel << 2;
 983         if (base_addr[CyLIVR] != 0x5c)
 984                 base_addr[CyLIVR] = 0x5c;
 985
 986         /* tx and rx baud rate */
 987
 988         if (base_addr[CyCOR1] != info->cor1)
 989                 need_init_chan = 1;
 990         if (base_addr[CyTCOR] != info->tco)
 991                 base_addr[CyTCOR] = info->tco;
 992         if (base_addr[CyTBPR] != info->tbpr)
 993                 base_addr[CyTBPR] = info->tbpr;
 994         if (base_addr[CyRCOR] != info->rco)
 995                 base_addr[CyRCOR] = info->rco;
 996         if (base_addr[CyRBPR] != info->rbpr)
 997                 base_addr[CyRBPR] = info->rbpr;
 998
 999         /* set line characteristics  according configuration */
1000
1001         if (base_addr[CySCHR1] != START_CHAR(info->tty))
1002                 base_addr[CySCHR1] = START_CHAR(info->tty);
1003         if (base_addr[CySCHR2] != STOP_CHAR(info->tty))
1004                 base_addr[CySCHR2] = STOP_CHAR(info->tty);
1005         if (base_addr[CySCRL] != START_CHAR(info->tty))
1006                 base_addr[CySCRL] = START_CHAR(info->tty);
1007         if (base_addr[CySCRH] != START_CHAR(info->tty))
1008                 base_addr[CySCRH] = START_CHAR(info->tty);
1009         if (base_addr[CyCOR1] != info->cor1)
1010                 base_addr[CyCOR1] = info->cor1;
1011         if (base_addr[CyCOR2] != info->cor2)
1012                 base_addr[CyCOR2] = info->cor2;
1013         if (base_addr[CyCOR3] != info->cor3)
1014                 base_addr[CyCOR3] = info->cor3;
1015         if (base_addr[CyCOR4] != info->cor4)
1016                 base_addr[CyCOR4] = info->cor4;
1017         if (base_addr[CyCOR5] != info->cor5)
1018                 base_addr[CyCOR5] = info->cor5;
1019         if (base_addr[CyCOR6] != info->cor6)
1020                 base_addr[CyCOR6] = info->cor6;
1021         if (base_addr[CyCOR7] != info->cor7)
1022                 base_addr[CyCOR7] = info->cor7;
1023
1024         if (need_init_chan)
1025                 write_cy_cmd(base_addr, CyINIT_CHAN);
1026
1027         base_addr[CyCAR] = (u_char) channel;    /* !!! Is this needed? */
1028
1029         /* 2ms default rx timeout */
1030         ti = info->default_timeout ? info->default_timeout : 0x02;
1031         if (base_addr[CyRTPRL] != ti)
1032                 base_addr[CyRTPRL] = ti;
1033         if (base_addr[CyRTPRH] != 0)
1034                 base_addr[CyRTPRH] = 0;
1035
1036         /* Set up RTS here also ????? RGH 141095 */
1037         if (i == 0) {           /* baud rate is zero, turn off line */
1038                 if ((base_addr[CyMSVR2] & CyDTR) == CyDTR)
1039                         base_addr[CyMSVR2] = 0;
1040 #ifdef SERIAL_DEBUG_DTR
1041                 printk("cyc: %d: dropping DTR\n", __LINE__);
1042                 printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1043                        base_addr[CyMSVR2]);
1044 #endif
1045         } else {
1046                 if ((base_addr[CyMSVR2] & CyDTR) != CyDTR)
1047                         base_addr[CyMSVR2] = CyDTR;
1048 #ifdef SERIAL_DEBUG_DTR
1049                 printk("cyc: %d: raising DTR\n", __LINE__);
1050                 printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1051                        base_addr[CyMSVR2]);
1052 #endif
1053         }
1054
1055         if (info->tty) {
1056                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
1057         }
1058
1059         local_irq_restore(flags);
1060
1061 }                               /* config_setup */
1062
1063 static int cy_put_char(struct tty_struct *tty, unsigned char ch)
1064 {
1065         struct cyclades_port *info = tty->driver_data;
1066         unsigned long flags;
1067
1068 #ifdef SERIAL_DEBUG_IO
1069         printk("cy_put_char %s(0x%02x)\n", tty->name, ch);
1070 #endif
1071
1072         if (serial_paranoia_check(info, tty->name, "cy_put_char"))
1073                 return 0;
1074
1075         if (!info->xmit_buf)
1076                 return 0;
1077
1078         local_irq_save(flags);
1079         if (info->xmit_cnt >= PAGE_SIZE - 1) {
1080                 local_irq_restore(flags);
1081                 return 0;
1082         }
1083
1084         info->xmit_buf[info->xmit_head++] = ch;
1085         info->xmit_head &= PAGE_SIZE - 1;
1086         info->xmit_cnt++;
1087         local_irq_restore(flags);
1088         return 1;
1089 }                               /* cy_put_char */
1090
1091 static void cy_flush_chars(struct tty_struct *tty)
1092 {
1093         struct cyclades_port *info = tty->driver_data;
1094         unsigned long flags;
1095         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1096         int channel;
1097
1098 #ifdef SERIAL_DEBUG_IO
1099         printk("cy_flush_chars %s\n", tty->name);       /* */
1100 #endif
1101
1102         if (serial_paranoia_check(info, tty->name, "cy_flush_chars"))
1103                 return;
1104
1105         if (info->xmit_cnt <= 0 || tty->stopped
1106             || tty->hw_stopped || !info->xmit_buf)
1107                 return;
1108
1109         channel = info->line;
1110
1111         local_irq_save(flags);
1112         base_addr[CyCAR] = channel;
1113         base_addr[CyIER] |= CyTxMpty;
1114         local_irq_restore(flags);
1115 }                               /* cy_flush_chars */
1116
1117 /* This routine gets called when tty_write has put something into
1118     the write_queue.  If the port is not already transmitting stuff,
1119     start it off by enabling interrupts.  The interrupt service
1120     routine will then ensure that the characters are sent.  If the
1121     port is already active, there is no need to kick it.
1122  */
1123 static int cy_write(struct tty_struct *tty, const unsigned char *buf, int count)
1124 {
1125         struct cyclades_port *info = tty->driver_data;
1126         unsigned long flags;
1127         int c, total = 0;
1128
1129 #ifdef SERIAL_DEBUG_IO
1130         printk("cy_write %s\n", tty->name);     /* */
1131 #endif
1132
1133         if (serial_paranoia_check(info, tty->name, "cy_write")) {
1134                 return 0;
1135         }
1136
1137         if (!info->xmit_buf) {
1138                 return 0;
1139         }
1140
1141         while (1) {
1142                 local_irq_save(flags);
1143                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
1144                                           SERIAL_XMIT_SIZE - info->xmit_head));
1145                 if (c <= 0) {
1146                         local_irq_restore(flags);
1147                         break;
1148                 }
1149
1150                 memcpy(info->xmit_buf + info->xmit_head, buf, c);
1151                 info->xmit_head =
1152                     (info->xmit_head + c) & (SERIAL_XMIT_SIZE - 1);
1153                 info->xmit_cnt += c;
1154                 local_irq_restore(flags);
1155
1156                 buf += c;
1157                 count -= c;
1158                 total += c;
1159         }
1160
1161         if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
1162                 start_xmit(info);
1163         }
1164         return total;
1165 }                               /* cy_write */
1166
1167 static int cy_write_room(struct tty_struct *tty)
1168 {
1169         struct cyclades_port *info = tty->driver_data;
1170         int ret;
1171
1172 #ifdef SERIAL_DEBUG_IO
1173         printk("cy_write_room %s\n", tty->name);        /* */
1174 #endif
1175
1176         if (serial_paranoia_check(info, tty->name, "cy_write_room"))
1177                 return 0;
1178         ret = PAGE_SIZE - info->xmit_cnt - 1;
1179         if (ret < 0)
1180                 ret = 0;
1181         return ret;
1182 }                               /* cy_write_room */
1183
1184 static int cy_chars_in_buffer(struct tty_struct *tty)
1185 {
1186         struct cyclades_port *info = tty->driver_data;
1187
1188 #ifdef SERIAL_DEBUG_IO
1189         printk("cy_chars_in_buffer %s %d\n", tty->name, info->xmit_cnt);        /* */
1190 #endif
1191
1192         if (serial_paranoia_check(info, tty->name, "cy_chars_in_buffer"))
1193                 return 0;
1194
1195         return info->xmit_cnt;
1196 }                               /* cy_chars_in_buffer */
1197
1198 static void cy_flush_buffer(struct tty_struct *tty)
1199 {
1200         struct cyclades_port *info = tty->driver_data;
1201         unsigned long flags;
1202
1203 #ifdef SERIAL_DEBUG_IO
1204         printk("cy_flush_buffer %s\n", tty->name);      /* */
1205 #endif
1206
1207         if (serial_paranoia_check(info, tty->name, "cy_flush_buffer"))
1208                 return;
1209         local_irq_save(flags);
1210         info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1211         local_irq_restore(flags);
1212         tty_wakeup(tty);
1213 }                               /* cy_flush_buffer */
1214
1215 /* This routine is called by the upper-layer tty layer to signal
1216    that incoming characters should be throttled or that the
1217    throttle should be released.
1218  */
1219 static void cy_throttle(struct tty_struct *tty)
1220 {
1221         struct cyclades_port *info = tty->driver_data;
1222         unsigned long flags;
1223         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1224         int channel;
1225
1226 #ifdef SERIAL_DEBUG_THROTTLE
1227         char buf[64];
1228
1229         printk("throttle %s: %d....\n", tty_name(tty, buf),
1230                tty->ldisc.chars_in_buffer(tty));
1231         printk("cy_throttle %s\n", tty->name);
1232 #endif
1233
1234         if (serial_paranoia_check(info, tty->name, "cy_nthrottle")) {
1235                 return;
1236         }
1237
1238         if (I_IXOFF(tty)) {
1239                 info->x_char = STOP_CHAR(tty);
1240                 /* Should use the "Send Special Character" feature!!! */
1241         }
1242
1243         channel = info->line;
1244
1245         local_irq_save(flags);
1246         base_addr[CyCAR] = (u_char) channel;
1247         base_addr[CyMSVR1] = 0;
1248         local_irq_restore(flags);
1249 }                               /* cy_throttle */
1250
1251 static void cy_unthrottle(struct tty_struct *tty)
1252 {
1253         struct cyclades_port *info = tty->driver_data;
1254         unsigned long flags;
1255         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1256         int channel;
1257
1258 #ifdef SERIAL_DEBUG_THROTTLE
1259         char buf[64];
1260
1261         printk("throttle %s: %d....\n", tty_name(tty, buf),
1262                tty->ldisc.chars_in_buffer(tty));
1263         printk("cy_unthrottle %s\n", tty->name);
1264 #endif
1265
1266         if (serial_paranoia_check(info, tty->name, "cy_nthrottle")) {
1267                 return;
1268         }
1269
1270         if (I_IXOFF(tty)) {
1271                 info->x_char = START_CHAR(tty);
1272                 /* Should use the "Send Special Character" feature!!! */
1273         }
1274
1275         channel = info->line;
1276
1277         local_irq_save(flags);
1278         base_addr[CyCAR] = (u_char) channel;
1279         base_addr[CyMSVR1] = CyRTS;
1280         local_irq_restore(flags);
1281 }                               /* cy_unthrottle */
1282
1283 static int
1284 get_serial_info(struct cyclades_port *info,
1285                 struct serial_struct __user * retinfo)
1286 {
1287         struct serial_struct tmp;
1288
1289 /* CP('g'); */
1290         if (!retinfo)
1291                 return -EFAULT;
1292         memset(&tmp, 0, sizeof(tmp));
1293         tmp.type = info->type;
1294         tmp.line = info->line;
1295         tmp.port = info->line;
1296         tmp.irq = 0;
1297         tmp.flags = info->flags;
1298         tmp.baud_base = 0;      /*!!! */
1299         tmp.close_delay = info->close_delay;
1300         tmp.custom_divisor = 0; /*!!! */
1301         tmp.hub6 = 0;           /*!!! */
1302         return copy_to_user(retinfo, &tmp, sizeof(*retinfo)) ? -EFAULT : 0;
1303 }                               /* get_serial_info */
1304
1305 static int
1306 set_serial_info(struct cyclades_port *info,
1307                 struct serial_struct __user * new_info)
1308 {
1309         struct serial_struct new_serial;
1310         struct cyclades_port old_info;
1311
1312 /* CP('s'); */
1313         if (!new_info)
1314                 return -EFAULT;
1315         if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
1316                 return -EFAULT;
1317         old_info = *info;
1318
1319         if (!capable(CAP_SYS_ADMIN)) {
1320                 if ((new_serial.close_delay != info->close_delay) ||
1321                     ((new_serial.flags & ASYNC_FLAGS & ~ASYNC_USR_MASK) !=
1322                      (info->flags & ASYNC_FLAGS & ~ASYNC_USR_MASK)))
1323                         return -EPERM;
1324                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1325                                (new_serial.flags & ASYNC_USR_MASK));
1326                 goto check_and_exit;
1327         }
1328
1329         /*
1330          * OK, past this point, all the error checking has been done.
1331          * At this point, we start making changes.....
1332          */
1333
1334         info->flags = ((info->flags & ~ASYNC_FLAGS) |
1335                        (new_serial.flags & ASYNC_FLAGS));
1336         info->close_delay = new_serial.close_delay;
1337
1338 check_and_exit:
1339         if (info->flags & ASYNC_INITIALIZED) {
1340                 config_setup(info);
1341                 return 0;
1342         }
1343         return startup(info);
1344 }                               /* set_serial_info */
1345
1346 static int cy_tiocmget(struct tty_struct *tty, struct file *file)
1347 {
1348         struct cyclades_port *info = tty->driver_data;
1349         int channel;
1350         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1351         unsigned long flags;
1352         unsigned char status;
1353
1354         channel = info->line;
1355
1356         local_irq_save(flags);
1357         base_addr[CyCAR] = (u_char) channel;
1358         status = base_addr[CyMSVR1] | base_addr[CyMSVR2];
1359         local_irq_restore(flags);
1360
1361         return ((status & CyRTS) ? TIOCM_RTS : 0)
1362             | ((status & CyDTR) ? TIOCM_DTR : 0)
1363             | ((status & CyDCD) ? TIOCM_CAR : 0)
1364             | ((status & CyDSR) ? TIOCM_DSR : 0)
1365             | ((status & CyCTS) ? TIOCM_CTS : 0);
1366 }                               /* cy_tiocmget */
1367
1368 static int
1369 cy_tiocmset(struct tty_struct *tty, struct file *file,
1370             unsigned int set, unsigned int clear)
1371 {
1372         struct cyclades_port *info = tty->driver_data;
1373         int channel;
1374         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1375         unsigned long flags;
1376
1377         channel = info->line;
1378
1379         if (set & TIOCM_RTS) {
1380                 local_irq_save(flags);
1381                 base_addr[CyCAR] = (u_char) channel;
1382                 base_addr[CyMSVR1] = CyRTS;
1383                 local_irq_restore(flags);
1384         }
1385         if (set & TIOCM_DTR) {
1386                 local_irq_save(flags);
1387                 base_addr[CyCAR] = (u_char) channel;
1388 /* CP('S');CP('2'); */
1389                 base_addr[CyMSVR2] = CyDTR;
1390 #ifdef SERIAL_DEBUG_DTR
1391                 printk("cyc: %d: raising DTR\n", __LINE__);
1392                 printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1393                        base_addr[CyMSVR2]);
1394 #endif
1395                 local_irq_restore(flags);
1396         }
1397
1398         if (clear & TIOCM_RTS) {
1399                 local_irq_save(flags);
1400                 base_addr[CyCAR] = (u_char) channel;
1401                 base_addr[CyMSVR1] = 0;
1402                 local_irq_restore(flags);
1403         }
1404         if (clear & TIOCM_DTR) {
1405                 local_irq_save(flags);
1406                 base_addr[CyCAR] = (u_char) channel;
1407 /* CP('C');CP('2'); */
1408                 base_addr[CyMSVR2] = 0;
1409 #ifdef SERIAL_DEBUG_DTR
1410                 printk("cyc: %d: dropping DTR\n", __LINE__);
1411                 printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1412                        base_addr[CyMSVR2]);
1413 #endif
1414                 local_irq_restore(flags);
1415         }
1416
1417         return 0;
1418 }                               /* set_modem_info */
1419
1420 static void send_break(struct cyclades_port *info, int duration)
1421 {                               /* Let the transmit ISR take care of this (since it
1422                                    requires stuffing characters into the output stream).
1423                                  */
1424         info->x_break = duration;
1425         if (!info->xmit_cnt) {
1426                 start_xmit(info);
1427         }
1428 }                               /* send_break */
1429
1430 static int
1431 get_mon_info(struct cyclades_port *info, struct cyclades_monitor __user * mon)
1432 {
1433
1434         if (copy_to_user(mon, &info->mon, sizeof(struct cyclades_monitor)))
1435                 return -EFAULT;
1436         info->mon.int_count = 0;
1437         info->mon.char_count = 0;
1438         info->mon.char_max = 0;
1439         info->mon.char_last = 0;
1440         return 0;
1441 }
1442
1443 static int set_threshold(struct cyclades_port *info, unsigned long __user * arg)
1444 {
1445         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1446         unsigned long value;
1447         int channel;
1448
1449         if (get_user(value, arg))
1450                 return -EFAULT;
1451
1452         channel = info->line;
1453         info->cor4 &= ~CyREC_FIFO;
1454         info->cor4 |= value & CyREC_FIFO;
1455         base_addr[CyCOR4] = info->cor4;
1456         return 0;
1457 }
1458
1459 static int
1460 get_threshold(struct cyclades_port *info, unsigned long __user * value)
1461 {
1462         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1463         int channel;
1464         unsigned long tmp;
1465
1466         channel = info->line;
1467
1468         tmp = base_addr[CyCOR4] & CyREC_FIFO;
1469         return put_user(tmp, value);
1470 }
1471
1472 static int
1473 set_default_threshold(struct cyclades_port *info, unsigned long __user * arg)
1474 {
1475         unsigned long value;
1476
1477         if (get_user(value, arg))
1478                 return -EFAULT;
1479
1480         info->default_threshold = value & 0x0f;
1481         return 0;
1482 }
1483
1484 static int
1485 get_default_threshold(struct cyclades_port *info, unsigned long __user * value)
1486 {
1487         return put_user(info->default_threshold, value);
1488 }
1489
1490 static int set_timeout(struct cyclades_port *info, unsigned long __user * arg)
1491 {
1492         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1493         int channel;
1494         unsigned long value;
1495
1496         if (get_user(value, arg))
1497                 return -EFAULT;
1498
1499         channel = info->line;
1500
1501         base_addr[CyRTPRL] = value & 0xff;
1502         base_addr[CyRTPRH] = (value >> 8) & 0xff;
1503         return 0;
1504 }
1505
1506 static int get_timeout(struct cyclades_port *info, unsigned long __user * value)
1507 {
1508         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1509         int channel;
1510         unsigned long tmp;
1511
1512         channel = info->line;
1513
1514         tmp = base_addr[CyRTPRL];
1515         return put_user(tmp, value);
1516 }
1517
1518 static int set_default_timeout(struct cyclades_port *info, unsigned long value)
1519 {
1520         info->default_timeout = value & 0xff;
1521         return 0;
1522 }
1523
1524 static int
1525 get_default_timeout(struct cyclades_port *info, unsigned long __user * value)
1526 {
1527         return put_user(info->default_timeout, value);
1528 }
1529
1530 static int
1531 cy_ioctl(struct tty_struct *tty, struct file *file,
1532          unsigned int cmd, unsigned long arg)
1533 {
1534         unsigned long val;
1535         struct cyclades_port *info = tty->driver_data;
1536         int ret_val = 0;
1537         void __user *argp = (void __user *)arg;
1538
1539 #ifdef SERIAL_DEBUG_OTHER
1540         printk("cy_ioctl %s, cmd = %x arg = %lx\n", tty->name, cmd, arg);       /* */
1541 #endif
1542
1543         lock_kernel();
1544
1545         switch (cmd) {
1546         case CYGETMON:
1547                 ret_val = get_mon_info(info, argp);
1548                 break;
1549         case CYGETTHRESH:
1550                 ret_val = get_threshold(info, argp);
1551                 break;
1552         case CYSETTHRESH:
1553                 ret_val = set_threshold(info, argp);
1554                 break;
1555         case CYGETDEFTHRESH:
1556                 ret_val = get_default_threshold(info, argp);
1557                 break;
1558         case CYSETDEFTHRESH:
1559                 ret_val = set_default_threshold(info, argp);
1560                 break;
1561         case CYGETTIMEOUT:
1562                 ret_val = get_timeout(info, argp);
1563                 break;
1564         case CYSETTIMEOUT:
1565                 ret_val = set_timeout(info, argp);
1566                 break;
1567         case CYGETDEFTIMEOUT:
1568                 ret_val = get_default_timeout(info, argp);
1569                 break;
1570         case CYSETDEFTIMEOUT:
1571                 ret_val = set_default_timeout(info, (unsigned long)arg);
1572                 break;
1573         case TCSBRK:            /* SVID version: non-zero arg --> no break */
1574                 ret_val = tty_check_change(tty);
1575                 if (ret_val)
1576                         break;
1577                 tty_wait_until_sent(tty, 0);
1578                 if (!arg)
1579                         send_break(info, HZ / 4);       /* 1/4 second */
1580                 break;
1581         case TCSBRKP:           /* support for POSIX tcsendbreak() */
1582                 ret_val = tty_check_change(tty);
1583                 if (ret_val)
1584                         break;
1585                 tty_wait_until_sent(tty, 0);
1586                 send_break(info, arg ? arg * (HZ / 10) : HZ / 4);
1587                 break;
1588
1589 /* The following commands are incompletely implemented!!! */
1590         case TIOCGSERIAL:
1591                 ret_val = get_serial_info(info, argp);
1592                 break;
1593         case TIOCSSERIAL:
1594                 ret_val = set_serial_info(info, argp);
1595                 break;
1596         default:
1597                 ret_val = -ENOIOCTLCMD;
1598         }
1599         unlock_kernel();
1600
1601 #ifdef SERIAL_DEBUG_OTHER
1602         printk("cy_ioctl done\n");
1603 #endif
1604
1605         return ret_val;
1606 }                               /* cy_ioctl */
1607
1608 static void cy_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1609 {
1610         struct cyclades_port *info = tty->driver_data;
1611
1612 #ifdef SERIAL_DEBUG_OTHER
1613         printk("cy_set_termios %s\n", tty->name);
1614 #endif
1615
1616         if (tty->termios->c_cflag == old_termios->c_cflag)
1617                 return;
1618         config_setup(info);
1619
1620         if ((old_termios->c_cflag & CRTSCTS) &&
1621             !(tty->termios->c_cflag & CRTSCTS)) {
1622                 tty->stopped = 0;
1623                 cy_start(tty);
1624         }
1625 #ifdef tytso_patch_94Nov25_1726
1626         if (!(old_termios->c_cflag & CLOCAL) &&
1627             (tty->termios->c_cflag & CLOCAL))
1628                 wake_up_interruptible(&info->open_wait);
1629 #endif
1630 }                               /* cy_set_termios */
1631
1632 static void cy_close(struct tty_struct *tty, struct file *filp)
1633 {
1634         struct cyclades_port *info = tty->driver_data;
1635
1636 /* CP('C'); */
1637 #ifdef SERIAL_DEBUG_OTHER
1638         printk("cy_close %s\n", tty->name);
1639 #endif
1640
1641         if (!info || serial_paranoia_check(info, tty->name, "cy_close")) {
1642                 return;
1643         }
1644 #ifdef SERIAL_DEBUG_OPEN
1645         printk("cy_close %s, count = %d\n", tty->name, info->count);
1646 #endif
1647
1648         if ((tty->count == 1) && (info->count != 1)) {
1649                 /*
1650                  * Uh, oh.  tty->count is 1, which means that the tty
1651                  * structure will be freed.  Info->count should always
1652                  * be one in these conditions.  If it's greater than
1653                  * one, we've got real problems, since it means the
1654                  * serial port won't be shutdown.
1655                  */
1656                 printk("cy_close: bad serial port count; tty->count is 1, "
1657                        "info->count is %d\n", info->count);
1658                 info->count = 1;
1659         }
1660 #ifdef SERIAL_DEBUG_COUNT
1661         printk("cyc: %d: decrementing count to %d\n", __LINE__,
1662                info->count - 1);
1663 #endif
1664         if (--info->count < 0) {
1665                 printk("cy_close: bad serial port count for ttys%d: %d\n",
1666                        info->line, info->count);
1667 #ifdef SERIAL_DEBUG_COUNT
1668                 printk("cyc: %d: setting count to 0\n", __LINE__);
1669 #endif
1670                 info->count = 0;
1671         }
1672         if (info->count)
1673                 return;
1674         info->flags |= ASYNC_CLOSING;
1675         if (info->flags & ASYNC_INITIALIZED)
1676                 tty_wait_until_sent(tty, 3000); /* 30 seconds timeout */
1677         shutdown(info);
1678         cy_flush_buffer(tty);
1679         tty_ldisc_flush(tty);
1680         info->tty = NULL;
1681         if (info->blocked_open) {
1682                 if (info->close_delay) {
1683                         msleep_interruptible(jiffies_to_msecs
1684                                              (info->close_delay));
1685                 }
1686                 wake_up_interruptible(&info->open_wait);
1687         }
1688         info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CLOSING);
1689         wake_up_interruptible(&info->close_wait);
1690
1691 #ifdef SERIAL_DEBUG_OTHER
1692         printk("cy_close done\n");
1693 #endif
1694 }                               /* cy_close */
1695
1696 /*
1697  * cy_hangup() --- called by tty_hangup() when a hangup is signaled.
1698  */
1699 void cy_hangup(struct tty_struct *tty)
1700 {
1701         struct cyclades_port *info = tty->driver_data;
1702
1703 #ifdef SERIAL_DEBUG_OTHER
1704         printk("cy_hangup %s\n", tty->name);    /* */
1705 #endif
1706
1707         if (serial_paranoia_check(info, tty->name, "cy_hangup"))
1708                 return;
1709
1710         shutdown(info);
1711 #if 0
1712         info->event = 0;
1713         info->count = 0;
1714 #ifdef SERIAL_DEBUG_COUNT
1715         printk("cyc: %d: setting count to 0\n", __LINE__);
1716 #endif
1717         info->tty = 0;
1718 #endif
1719         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1720         wake_up_interruptible(&info->open_wait);
1721 }                               /* cy_hangup */
1722
1723 /*
1724  * ------------------------------------------------------------
1725  * cy_open() and friends
1726  * ------------------------------------------------------------
1727  */
1728
1729 static int
1730 block_til_ready(struct tty_struct *tty, struct file *filp,
1731                 struct cyclades_port *info)
1732 {
1733         DECLARE_WAITQUEUE(wait, current);
1734         unsigned long flags;
1735         int channel;
1736         int retval;
1737         volatile u_char *base_addr = (u_char *) BASE_ADDR;
1738
1739         /*
1740          * If the device is in the middle of being closed, then block
1741          * until it's done, and then try again.
1742          */
1743         if (info->flags & ASYNC_CLOSING) {
1744                 interruptible_sleep_on(&info->close_wait);
1745                 if (info->flags & ASYNC_HUP_NOTIFY) {
1746                         return -EAGAIN;
1747                 } else {
1748                         return -ERESTARTSYS;
1749                 }
1750         }
1751
1752         /*
1753          * If non-blocking mode is set, then make the check up front
1754          * and then exit.
1755          */
1756         if (filp->f_flags & O_NONBLOCK) {
1757                 info->flags |= ASYNC_NORMAL_ACTIVE;
1758                 return 0;
1759         }
1760
1761         /*
1762          * Block waiting for the carrier detect and the line to become
1763          * free (i.e., not in use by the callout).  While we are in
1764          * this loop, info->count is dropped by one, so that
1765          * cy_close() knows when to free things.  We restore it upon
1766          * exit, either normal or abnormal.
1767          */
1768         retval = 0;
1769         add_wait_queue(&info->open_wait, &wait);
1770 #ifdef SERIAL_DEBUG_OPEN
1771         printk("block_til_ready before block: %s, count = %d\n",
1772                tty->name, info->count);
1773         /**/
1774 #endif
1775             info->count--;
1776 #ifdef SERIAL_DEBUG_COUNT
1777         printk("cyc: %d: decrementing count to %d\n", __LINE__, info->count);
1778 #endif
1779         info->blocked_open++;
1780
1781         channel = info->line;
1782
1783         while (1) {
1784                 local_irq_save(flags);
1785                 base_addr[CyCAR] = (u_char) channel;
1786                 base_addr[CyMSVR1] = CyRTS;
1787 /* CP('S');CP('4'); */
1788                 base_addr[CyMSVR2] = CyDTR;
1789 #ifdef SERIAL_DEBUG_DTR
1790                 printk("cyc: %d: raising DTR\n", __LINE__);
1791                 printk("     status: 0x%x, 0x%x\n", base_addr[CyMSVR1],
1792                        base_addr[CyMSVR2]);
1793 #endif
1794                 local_irq_restore(flags);
1795                 set_current_state(TASK_INTERRUPTIBLE);
1796                 if (tty_hung_up_p(filp)
1797                     || !(info->flags & ASYNC_INITIALIZED)) {
1798                         if (info->flags & ASYNC_HUP_NOTIFY) {
1799                                 retval = -EAGAIN;
1800                         } else {
1801                                 retval = -ERESTARTSYS;
1802                         }
1803                         break;
1804                 }
1805                 local_irq_save(flags);
1806                 base_addr[CyCAR] = (u_char) channel;
1807 /* CP('L');CP1(1 && C_CLOCAL(tty)); CP1(1 && (base_addr[CyMSVR1] & CyDCD) ); */
1808                 if (!(info->flags & ASYNC_CLOSING)
1809                     && (C_CLOCAL(tty)
1810                         || (base_addr[CyMSVR1] & CyDCD))) {
1811                         local_irq_restore(flags);
1812                         break;
1813                 }
1814                 local_irq_restore(flags);
1815                 if (signal_pending(current)) {
1816                         retval = -ERESTARTSYS;
1817                         break;
1818                 }
1819 #ifdef SERIAL_DEBUG_OPEN
1820                 printk("block_til_ready blocking: %s, count = %d\n",
1821                        tty->name, info->count);
1822                 /**/
1823 #endif
1824                     schedule();
1825         }
1826         __set_current_state(TASK_RUNNING);
1827         remove_wait_queue(&info->open_wait, &wait);
1828         if (!tty_hung_up_p(filp)) {
1829                 info->count++;
1830 #ifdef SERIAL_DEBUG_COUNT
1831                 printk("cyc: %d: incrementing count to %d\n", __LINE__,
1832                        info->count);
1833 #endif
1834         }
1835         info->blocked_open--;
1836 #ifdef SERIAL_DEBUG_OPEN
1837         printk("block_til_ready after blocking: %s, count = %d\n",
1838                tty->name, info->count);
1839         /**/
1840 #endif
1841             if (retval)
1842                 return retval;
1843         info->flags |= ASYNC_NORMAL_ACTIVE;
1844         return 0;
1845 }                               /* block_til_ready */
1846
1847 /*
1848  * This routine is called whenever a serial port is opened.  It
1849  * performs the serial-specific initialization for the tty structure.
1850  */
1851 int cy_open(struct tty_struct *tty, struct file *filp)
1852 {
1853         struct cyclades_port *info;
1854         int retval, line;
1855
1856 /* CP('O'); */
1857         line = tty->index;
1858         if ((line < 0) || (NR_PORTS <= line)) {
1859                 return -ENODEV;
1860         }
1861         info = &cy_port[line];
1862         if (info->line < 0) {
1863                 return -ENODEV;
1864         }
1865 #ifdef SERIAL_DEBUG_OTHER
1866         printk("cy_open %s\n", tty->name);      /* */
1867 #endif
1868         if (serial_paranoia_check(info, tty->name, "cy_open")) {
1869                 return -ENODEV;
1870         }
1871 #ifdef SERIAL_DEBUG_OPEN
1872         printk("cy_open %s, count = %d\n", tty->name, info->count);
1873         /**/
1874 #endif
1875             info->count++;
1876 #ifdef SERIAL_DEBUG_COUNT
1877         printk("cyc: %d: incrementing count to %d\n", __LINE__, info->count);
1878 #endif
1879         tty->driver_data = info;
1880         info->tty = tty;
1881
1882         /*
1883          * Start up serial port
1884          */
1885         retval = startup(info);
1886         if (retval) {
1887                 return retval;
1888         }
1889
1890         retval = block_til_ready(tty, filp, info);
1891         if (retval) {
1892 #ifdef SERIAL_DEBUG_OPEN
1893                 printk("cy_open returning after block_til_ready with %d\n",
1894                        retval);
1895 #endif
1896                 return retval;
1897         }
1898 #ifdef SERIAL_DEBUG_OPEN
1899         printk("cy_open done\n");
1900         /**/
1901 #endif
1902             return 0;
1903 }                               /* cy_open */
1904
1905 /*
1906  * ---------------------------------------------------------------------
1907  * serial167_init() and friends
1908  *
1909  * serial167_init() is called at boot-time to initialize the serial driver.
1910  * ---------------------------------------------------------------------
1911  */
1912
1913 /*
1914  * This routine prints out the appropriate serial driver version
1915  * number, and identifies which options were configured into this
1916  * driver.
1917  */
1918 static void show_version(void)
1919 {
1920         printk("MVME166/167 cd2401 driver\n");
1921 }                               /* show_version */
1922
1923 /* initialize chips on card -- return number of valid
1924    chips (which is number of ports/4) */
1925
1926 /*
1927  * This initialises the hardware to a reasonable state.  It should
1928  * probe the chip first so as to copy 166-Bug setup as a default for
1929  * port 0.  It initialises CMR to CyASYNC; that is never done again, so
1930  * as to limit the number of CyINIT_CHAN commands in normal running.
1931  *
1932  * ... I wonder what I should do if this fails ...
1933  */
1934
1935 void mvme167_serial_console_setup(int cflag)
1936 {
1937         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
1938         int ch;
1939         u_char spd;
1940         u_char rcor, rbpr, badspeed = 0;
1941         unsigned long flags;
1942
1943         local_irq_save(flags);
1944
1945         /*
1946          * First probe channel zero of the chip, to see what speed has
1947          * been selected.
1948          */
1949
1950         base_addr[CyCAR] = 0;
1951
1952         rcor = base_addr[CyRCOR] << 5;
1953         rbpr = base_addr[CyRBPR];
1954
1955         for (spd = 0; spd < sizeof(baud_bpr); spd++)
1956                 if (rbpr == baud_bpr[spd] && rcor == baud_co[spd])
1957                         break;
1958         if (spd >= sizeof(baud_bpr)) {
1959                 spd = 14;       /* 19200 */
1960                 badspeed = 1;   /* Failed to identify speed */
1961         }
1962         initial_console_speed = spd;
1963
1964         /* OK, we have chosen a speed, now reset and reinitialise */
1965
1966         my_udelay(20000L);      /* Allow time for any active o/p to complete */
1967         if (base_addr[CyCCR] != 0x00) {
1968                 local_irq_restore(flags);
1969                 /* printk(" chip is never idle (CCR != 0)\n"); */
1970                 return;
1971         }
1972
1973         base_addr[CyCCR] = CyCHIP_RESET;        /* Reset the chip */
1974         my_udelay(1000L);
1975
1976         if (base_addr[CyGFRCR] == 0x00) {
1977                 local_irq_restore(flags);
1978                 /* printk(" chip is not responding (GFRCR stayed 0)\n"); */
1979                 return;
1980         }
1981
1982         /*
1983          * System clock is 20Mhz, divided by 2048, so divide by 10 for a 1.0ms
1984          * tick
1985          */
1986
1987         base_addr[CyTPR] = 10;
1988
1989         base_addr[CyPILR1] = 0x01;      /* Interrupt level for modem change */
1990         base_addr[CyPILR2] = 0x02;      /* Interrupt level for tx ints */
1991         base_addr[CyPILR3] = 0x03;      /* Interrupt level for rx ints */
1992
1993         /*
1994          * Attempt to set up all channels to something reasonable, and
1995          * bang out a INIT_CHAN command.  We should then be able to limit
1996          * the ammount of fiddling we have to do in normal running.
1997          */
1998
1999         for (ch = 3; ch >= 0; ch--) {
2000                 base_addr[CyCAR] = (u_char) ch;
2001                 base_addr[CyIER] = 0;
2002                 base_addr[CyCMR] = CyASYNC;
2003                 base_addr[CyLICR] = (u_char) ch << 2;
2004                 base_addr[CyLIVR] = 0x5c;
2005                 base_addr[CyTCOR] = baud_co[spd];
2006                 base_addr[CyTBPR] = baud_bpr[spd];
2007                 base_addr[CyRCOR] = baud_co[spd] >> 5;
2008                 base_addr[CyRBPR] = baud_bpr[spd];
2009                 base_addr[CySCHR1] = 'Q' & 0x1f;
2010                 base_addr[CySCHR2] = 'X' & 0x1f;
2011                 base_addr[CySCRL] = 0;
2012                 base_addr[CySCRH] = 0;
2013                 base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
2014                 base_addr[CyCOR2] = 0;
2015                 base_addr[CyCOR3] = Cy_1_STOP;
2016                 base_addr[CyCOR4] = baud_cor4[spd];
2017                 base_addr[CyCOR5] = 0;
2018                 base_addr[CyCOR6] = 0;
2019                 base_addr[CyCOR7] = 0;
2020                 base_addr[CyRTPRL] = 2;
2021                 base_addr[CyRTPRH] = 0;
2022                 base_addr[CyMSVR1] = 0;
2023                 base_addr[CyMSVR2] = 0;
2024                 write_cy_cmd(base_addr, CyINIT_CHAN | CyDIS_RCVR | CyDIS_XMTR);
2025         }
2026
2027         /*
2028          * Now do specials for channel zero....
2029          */
2030
2031         base_addr[CyMSVR1] = CyRTS;
2032         base_addr[CyMSVR2] = CyDTR;
2033         base_addr[CyIER] = CyRxData;
2034         write_cy_cmd(base_addr, CyENB_RCVR | CyENB_XMTR);
2035
2036         local_irq_restore(flags);
2037
2038         my_udelay(20000L);      /* Let it all settle down */
2039
2040         printk("CD2401 initialised,  chip is rev 0x%02x\n", base_addr[CyGFRCR]);
2041         if (badspeed)
2042                 printk
2043                     ("  WARNING:  Failed to identify line speed, rcor=%02x,rbpr=%02x\n",
2044                      rcor >> 5, rbpr);
2045 }                               /* serial_console_init */
2046
2047 static const struct tty_operations cy_ops = {
2048         .open = cy_open,
2049         .close = cy_close,
2050         .write = cy_write,
2051         .put_char = cy_put_char,
2052         .flush_chars = cy_flush_chars,
2053         .write_room = cy_write_room,
2054         .chars_in_buffer = cy_chars_in_buffer,
2055         .flush_buffer = cy_flush_buffer,
2056         .ioctl = cy_ioctl,
2057         .throttle = cy_throttle,
2058         .unthrottle = cy_unthrottle,
2059         .set_termios = cy_set_termios,
2060         .stop = cy_stop,
2061         .start = cy_start,
2062         .hangup = cy_hangup,
2063         .tiocmget = cy_tiocmget,
2064         .tiocmset = cy_tiocmset,
2065 };
2066
2067 /* The serial driver boot-time initialization code!
2068     Hardware I/O ports are mapped to character special devices on a
2069     first found, first allocated manner.  That is, this code searches
2070     for Cyclom cards in the system.  As each is found, it is probed
2071     to discover how many chips (and thus how many ports) are present.
2072     These ports are mapped to the tty ports 64 and upward in monotonic
2073     fashion.  If an 8-port card is replaced with a 16-port card, the
2074     port mapping on a following card will shift.
2075
2076     This approach is different from what is used in the other serial
2077     device driver because the Cyclom is more properly a multiplexer,
2078     not just an aggregation of serial ports on one card.
2079
2080     If there are more cards with more ports than have been statically
2081     allocated above, a warning is printed and the extra ports are ignored.
2082  */
2083 static int __init serial167_init(void)
2084 {
2085         struct cyclades_port *info;
2086         int ret = 0;
2087         int good_ports = 0;
2088         int port_num = 0;
2089         int index;
2090         int DefSpeed;
2091 #ifdef notyet
2092         struct sigaction sa;
2093 #endif
2094
2095         if (!(mvme16x_config & MVME16x_CONFIG_GOT_CD2401))
2096                 return 0;
2097
2098         cy_serial_driver = alloc_tty_driver(NR_PORTS);
2099         if (!cy_serial_driver)
2100                 return -ENOMEM;
2101
2102 #if 0
2103         scrn[1] = '\0';
2104 #endif
2105
2106         show_version();
2107
2108         /* Has "console=0,9600n8" been used in bootinfo to change speed? */
2109         if (serial_console_cflag)
2110                 DefSpeed = serial_console_cflag & 0017;
2111         else {
2112                 DefSpeed = initial_console_speed;
2113                 serial_console_info = &cy_port[0];
2114                 serial_console_cflag = DefSpeed | CS8;
2115 #if 0
2116                 serial_console = 64;    /*callout_driver.minor_start */
2117 #endif
2118         }
2119
2120         /* Initialize the tty_driver structure */
2121
2122         cy_serial_driver->owner = THIS_MODULE;
2123         cy_serial_driver->name = "ttyS";
2124         cy_serial_driver->major = TTY_MAJOR;
2125         cy_serial_driver->minor_start = 64;
2126         cy_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2127         cy_serial_driver->subtype = SERIAL_TYPE_NORMAL;
2128         cy_serial_driver->init_termios = tty_std_termios;
2129         cy_serial_driver->init_termios.c_cflag =
2130             B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2131         cy_serial_driver->flags = TTY_DRIVER_REAL_RAW;
2132         tty_set_operations(cy_serial_driver, &cy_ops);
2133
2134         ret = tty_register_driver(cy_serial_driver);
2135         if (ret) {
2136                 printk(KERN_ERR "Couldn't register MVME166/7 serial driver\n");
2137                 put_tty_driver(cy_serial_driver);
2138                 return ret;
2139         }
2140
2141         port_num = 0;
2142         info = cy_port;
2143         for (index = 0; index < 1; index++) {
2144
2145                 good_ports = 4;
2146
2147                 if (port_num < NR_PORTS) {
2148                         while (good_ports-- && port_num < NR_PORTS) {
2149                 /*** initialize port ***/
2150                                 info->magic = CYCLADES_MAGIC;
2151                                 info->type = PORT_CIRRUS;
2152                                 info->card = index;
2153                                 info->line = port_num;
2154                                 info->flags = STD_COM_FLAGS;
2155                                 info->tty = NULL;
2156                                 info->xmit_fifo_size = 12;
2157                                 info->cor1 = CyPARITY_NONE | Cy_8_BITS;
2158                                 info->cor2 = CyETC;
2159                                 info->cor3 = Cy_1_STOP;
2160                                 info->cor4 = 0x08;      /* _very_ small receive threshold */
2161                                 info->cor5 = 0;
2162                                 info->cor6 = 0;
2163                                 info->cor7 = 0;
2164                                 info->tbpr = baud_bpr[DefSpeed];        /* Tx BPR */
2165                                 info->tco = baud_co[DefSpeed];  /* Tx CO */
2166                                 info->rbpr = baud_bpr[DefSpeed];        /* Rx BPR */
2167                                 info->rco = baud_co[DefSpeed] >> 5;     /* Rx CO */
2168                                 info->close_delay = 0;
2169                                 info->x_char = 0;
2170                                 info->count = 0;
2171 #ifdef SERIAL_DEBUG_COUNT
2172                                 printk("cyc: %d: setting count to 0\n",
2173                                        __LINE__);
2174 #endif
2175                                 info->blocked_open = 0;
2176                                 info->default_threshold = 0;
2177                                 info->default_timeout = 0;
2178                                 init_waitqueue_head(&info->open_wait);
2179                                 init_waitqueue_head(&info->close_wait);
2180                                 /* info->session */
2181                                 /* info->pgrp */
2182 /*** !!!!!!!! this may expose new bugs !!!!!!!!! *********/
2183                                 info->read_status_mask =
2184                                     CyTIMEOUT | CySPECHAR | CyBREAK | CyPARITY |
2185                                     CyFRAME | CyOVERRUN;
2186                                 /* info->timeout */
2187
2188                                 printk("ttyS%d ", info->line);
2189                                 port_num++;
2190                                 info++;
2191                                 if (!(port_num & 7)) {
2192                                         printk("\n               ");
2193                                 }
2194                         }
2195                 }
2196                 printk("\n");
2197         }
2198         while (port_num < NR_PORTS) {
2199                 info->line = -1;
2200                 port_num++;
2201                 info++;
2202         }
2203 #ifdef CONFIG_REMOTE_DEBUG
2204         debug_setup();
2205 #endif
2206         ret = request_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt, 0,
2207                           "cd2401_errors", cd2401_rxerr_interrupt);
2208         if (ret) {
2209                 printk(KERN_ERR "Could't get cd2401_errors IRQ");
2210                 goto cleanup_serial_driver;
2211         }
2212
2213         ret = request_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt, 0,
2214                           "cd2401_modem", cd2401_modem_interrupt);
2215         if (ret) {
2216                 printk(KERN_ERR "Could't get cd2401_modem IRQ");
2217                 goto cleanup_irq_cd2401_errors;
2218         }
2219
2220         ret = request_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt, 0,
2221                           "cd2401_txints", cd2401_tx_interrupt);
2222         if (ret) {
2223                 printk(KERN_ERR "Could't get cd2401_txints IRQ");
2224                 goto cleanup_irq_cd2401_modem;
2225         }
2226
2227         ret = request_irq(MVME167_IRQ_SER_RX, cd2401_rx_interrupt, 0,
2228                           "cd2401_rxints", cd2401_rx_interrupt);
2229         if (ret) {
2230                 printk(KERN_ERR "Could't get cd2401_rxints IRQ");
2231                 goto cleanup_irq_cd2401_txints;
2232         }
2233
2234         /* Now we have registered the interrupt handlers, allow the interrupts */
2235
2236         pcc2chip[PccSCCMICR] = 0x15;    /* Serial ints are level 5 */
2237         pcc2chip[PccSCCTICR] = 0x15;
2238         pcc2chip[PccSCCRICR] = 0x15;
2239
2240         pcc2chip[PccIMLR] = 3;  /* Allow PCC2 ints above 3!? */
2241
2242         return 0;
2243 cleanup_irq_cd2401_txints:
2244         free_irq(MVME167_IRQ_SER_TX, cd2401_tx_interrupt);
2245 cleanup_irq_cd2401_modem:
2246         free_irq(MVME167_IRQ_SER_MODEM, cd2401_modem_interrupt);
2247 cleanup_irq_cd2401_errors:
2248         free_irq(MVME167_IRQ_SER_ERR, cd2401_rxerr_interrupt);
2249 cleanup_serial_driver:
2250         if (tty_unregister_driver(cy_serial_driver))
2251                 printk(KERN_ERR
2252                        "Couldn't unregister MVME166/7 serial driver\n");
2253         put_tty_driver(cy_serial_driver);
2254         return ret;
2255 }                               /* serial167_init */
2256
2257 module_init(serial167_init);
2258
2259 #ifdef CYCLOM_SHOW_STATUS
2260 static void show_status(int line_num)
2261 {
2262         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2263         int channel;
2264         struct cyclades_port *info;
2265         unsigned long flags;
2266
2267         info = &cy_port[line_num];
2268         channel = info->line;
2269         printk("  channel %d\n", channel);
2270         /**/ printk(" cy_port\n");
2271         printk("  card line flags = %d %d %x\n",
2272                info->card, info->line, info->flags);
2273         printk
2274             ("  *tty read_status_mask timeout xmit_fifo_size = %lx %x %x %x\n",
2275              (long)info->tty, info->read_status_mask, info->timeout,
2276              info->xmit_fifo_size);
2277         printk("  cor1,cor2,cor3,cor4,cor5,cor6,cor7 = %x %x %x %x %x %x %x\n",
2278                info->cor1, info->cor2, info->cor3, info->cor4, info->cor5,
2279                info->cor6, info->cor7);
2280         printk("  tbpr,tco,rbpr,rco = %d %d %d %d\n", info->tbpr, info->tco,
2281                info->rbpr, info->rco);
2282         printk("  close_delay event count = %d %d %d\n", info->close_delay,
2283                info->event, info->count);
2284         printk("  x_char blocked_open = %x %x\n", info->x_char,
2285                info->blocked_open);
2286         printk("  open_wait = %lx %lx %lx\n", (long)info->open_wait);
2287
2288         local_irq_save(flags);
2289
2290 /* Global Registers */
2291
2292         printk(" CyGFRCR %x\n", base_addr[CyGFRCR]);
2293         printk(" CyCAR %x\n", base_addr[CyCAR]);
2294         printk(" CyRISR %x\n", base_addr[CyRISR]);
2295         printk(" CyTISR %x\n", base_addr[CyTISR]);
2296         printk(" CyMISR %x\n", base_addr[CyMISR]);
2297         printk(" CyRIR %x\n", base_addr[CyRIR]);
2298         printk(" CyTIR %x\n", base_addr[CyTIR]);
2299         printk(" CyMIR %x\n", base_addr[CyMIR]);
2300         printk(" CyTPR %x\n", base_addr[CyTPR]);
2301
2302         base_addr[CyCAR] = (u_char) channel;
2303
2304 /* Virtual Registers */
2305
2306 #if 0
2307         printk(" CyRIVR %x\n", base_addr[CyRIVR]);
2308         printk(" CyTIVR %x\n", base_addr[CyTIVR]);
2309         printk(" CyMIVR %x\n", base_addr[CyMIVR]);
2310         printk(" CyMISR %x\n", base_addr[CyMISR]);
2311 #endif
2312
2313 /* Channel Registers */
2314
2315         printk(" CyCCR %x\n", base_addr[CyCCR]);
2316         printk(" CyIER %x\n", base_addr[CyIER]);
2317         printk(" CyCOR1 %x\n", base_addr[CyCOR1]);
2318         printk(" CyCOR2 %x\n", base_addr[CyCOR2]);
2319         printk(" CyCOR3 %x\n", base_addr[CyCOR3]);
2320         printk(" CyCOR4 %x\n", base_addr[CyCOR4]);
2321         printk(" CyCOR5 %x\n", base_addr[CyCOR5]);
2322 #if 0
2323         printk(" CyCCSR %x\n", base_addr[CyCCSR]);
2324         printk(" CyRDCR %x\n", base_addr[CyRDCR]);
2325 #endif
2326         printk(" CySCHR1 %x\n", base_addr[CySCHR1]);
2327         printk(" CySCHR2 %x\n", base_addr[CySCHR2]);
2328 #if 0
2329         printk(" CySCHR3 %x\n", base_addr[CySCHR3]);
2330         printk(" CySCHR4 %x\n", base_addr[CySCHR4]);
2331         printk(" CySCRL %x\n", base_addr[CySCRL]);
2332         printk(" CySCRH %x\n", base_addr[CySCRH]);
2333         printk(" CyLNC %x\n", base_addr[CyLNC]);
2334         printk(" CyMCOR1 %x\n", base_addr[CyMCOR1]);
2335         printk(" CyMCOR2 %x\n", base_addr[CyMCOR2]);
2336 #endif
2337         printk(" CyRTPRL %x\n", base_addr[CyRTPRL]);
2338         printk(" CyRTPRH %x\n", base_addr[CyRTPRH]);
2339         printk(" CyMSVR1 %x\n", base_addr[CyMSVR1]);
2340         printk(" CyMSVR2 %x\n", base_addr[CyMSVR2]);
2341         printk(" CyRBPR %x\n", base_addr[CyRBPR]);
2342         printk(" CyRCOR %x\n", base_addr[CyRCOR]);
2343         printk(" CyTBPR %x\n", base_addr[CyTBPR]);
2344         printk(" CyTCOR %x\n", base_addr[CyTCOR]);
2345
2346         local_irq_restore(flags);
2347 }                               /* show_status */
2348 #endif
2349
2350 #if 0
2351 /* Dummy routine in mvme16x/config.c for now */
2352
2353 /* Serial console setup. Called from linux/init/main.c */
2354
2355 void console_setup(char *str, int *ints)
2356 {
2357         char *s;
2358         int baud, bits, parity;
2359         int cflag = 0;
2360
2361         /* Sanity check. */
2362         if (ints[0] > 3 || ints[1] > 3)
2363                 return;
2364
2365         /* Get baud, bits and parity */
2366         baud = 2400;
2367         bits = 8;
2368         parity = 'n';
2369         if (ints[2])
2370                 baud = ints[2];
2371         if ((s = strchr(str, ','))) {
2372                 do {
2373                         s++;
2374                 } while (*s >= '0' && *s <= '9');
2375                 if (*s)
2376                         parity = *s++;
2377                 if (*s)
2378                         bits = *s - '0';
2379         }
2380
2381         /* Now construct a cflag setting. */
2382         switch (baud) {
2383         case 1200:
2384                 cflag |= B1200;
2385                 break;
2386         case 9600:
2387                 cflag |= B9600;
2388                 break;
2389         case 19200:
2390                 cflag |= B19200;
2391                 break;
2392         case 38400:
2393                 cflag |= B38400;
2394                 break;
2395         case 2400:
2396         default:
2397                 cflag |= B2400;
2398                 break;
2399         }
2400         switch (bits) {
2401         case 7:
2402                 cflag |= CS7;
2403                 break;
2404         default:
2405         case 8:
2406                 cflag |= CS8;
2407                 break;
2408         }
2409         switch (parity) {
2410         case 'o':
2411         case 'O':
2412                 cflag |= PARODD;
2413                 break;
2414         case 'e':
2415         case 'E':
2416                 cflag |= PARENB;
2417                 break;
2418         }
2419
2420         serial_console_info = &cy_port[ints[1]];
2421         serial_console_cflag = cflag;
2422         serial_console = ints[1] + 64;  /*callout_driver.minor_start */
2423 }
2424 #endif
2425
2426 /*
2427  * The following is probably out of date for 2.1.x serial console stuff.
2428  *
2429  * The console is registered early on from arch/m68k/kernel/setup.c, and
2430  * it therefore relies on the chip being setup correctly by 166-Bug.  This
2431  * seems reasonable, as the serial port has been used to invoke the system
2432  * boot.  It also means that this function must not rely on any data
2433  * initialisation performed by serial167_init() etc.
2434  *
2435  * Of course, once the console has been registered, we had better ensure
2436  * that serial167_init() doesn't leave the chip non-functional.
2437  *
2438  * The console must be locked when we get here.
2439  */
2440
2441 void serial167_console_write(struct console *co, const char *str,
2442                              unsigned count)
2443 {
2444         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2445         unsigned long flags;
2446         volatile u_char sink;
2447         u_char ier;
2448         int port;
2449         u_char do_lf = 0;
2450         int i = 0;
2451
2452         local_irq_save(flags);
2453
2454         /* Ensure transmitter is enabled! */
2455
2456         port = 0;
2457         base_addr[CyCAR] = (u_char) port;
2458         while (base_addr[CyCCR])
2459                 ;
2460         base_addr[CyCCR] = CyENB_XMTR;
2461
2462         ier = base_addr[CyIER];
2463         base_addr[CyIER] = CyTxMpty;
2464
2465         while (1) {
2466                 if (pcc2chip[PccSCCTICR] & 0x20) {
2467                         /* We have a Tx int. Acknowledge it */
2468                         sink = pcc2chip[PccTPIACKR];
2469                         if ((base_addr[CyLICR] >> 2) == port) {
2470                                 if (i == count) {
2471                                         /* Last char of string is now output */
2472                                         base_addr[CyTEOIR] = CyNOTRANS;
2473                                         break;
2474                                 }
2475                                 if (do_lf) {
2476                                         base_addr[CyTDR] = '\n';
2477                                         str++;
2478                                         i++;
2479                                         do_lf = 0;
2480                                 } else if (*str == '\n') {
2481                                         base_addr[CyTDR] = '\r';
2482                                         do_lf = 1;
2483                                 } else {
2484                                         base_addr[CyTDR] = *str++;
2485                                         i++;
2486                                 }
2487                                 base_addr[CyTEOIR] = 0;
2488                         } else
2489                                 base_addr[CyTEOIR] = CyNOTRANS;
2490                 }
2491         }
2492
2493         base_addr[CyIER] = ier;
2494
2495         local_irq_restore(flags);
2496 }
2497
2498 static struct tty_driver *serial167_console_device(struct console *c,
2499                                                    int *index)
2500 {
2501         *index = c->index;
2502         return cy_serial_driver;
2503 }
2504
2505 static struct console sercons = {
2506         .name = "ttyS",
2507         .write = serial167_console_write,
2508         .device = serial167_console_device,
2509         .flags = CON_PRINTBUFFER,
2510         .index = -1,
2511 };
2512
2513 static int __init serial167_console_init(void)
2514 {
2515         if (vme_brdtype == VME_TYPE_MVME166 ||
2516             vme_brdtype == VME_TYPE_MVME167 ||
2517             vme_brdtype == VME_TYPE_MVME177) {
2518                 mvme167_serial_console_setup(0);
2519                 register_console(&sercons);
2520         }
2521         return 0;
2522 }
2523
2524 console_initcall(serial167_console_init);
2525
2526 #ifdef CONFIG_REMOTE_DEBUG
2527 void putDebugChar(int c)
2528 {
2529         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2530         unsigned long flags;
2531         volatile u_char sink;
2532         u_char ier;
2533         int port;
2534
2535         local_irq_save(flags);
2536
2537         /* Ensure transmitter is enabled! */
2538
2539         port = DEBUG_PORT;
2540         base_addr[CyCAR] = (u_char) port;
2541         while (base_addr[CyCCR])
2542                 ;
2543         base_addr[CyCCR] = CyENB_XMTR;
2544
2545         ier = base_addr[CyIER];
2546         base_addr[CyIER] = CyTxMpty;
2547
2548         while (1) {
2549                 if (pcc2chip[PccSCCTICR] & 0x20) {
2550                         /* We have a Tx int. Acknowledge it */
2551                         sink = pcc2chip[PccTPIACKR];
2552                         if ((base_addr[CyLICR] >> 2) == port) {
2553                                 base_addr[CyTDR] = c;
2554                                 base_addr[CyTEOIR] = 0;
2555                                 break;
2556                         } else
2557                                 base_addr[CyTEOIR] = CyNOTRANS;
2558                 }
2559         }
2560
2561         base_addr[CyIER] = ier;
2562
2563         local_irq_restore(flags);
2564 }
2565
2566 int getDebugChar()
2567 {
2568         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2569         unsigned long flags;
2570         volatile u_char sink;
2571         u_char ier;
2572         int port;
2573         int i, c;
2574
2575         i = debugiq.out;
2576         if (i != debugiq.in) {
2577                 c = debugiq.buf[i];
2578                 if (++i == DEBUG_LEN)
2579                         i = 0;
2580                 debugiq.out = i;
2581                 return c;
2582         }
2583         /* OK, nothing in queue, wait in poll loop */
2584
2585         local_irq_save(flags);
2586
2587         /* Ensure receiver is enabled! */
2588
2589         port = DEBUG_PORT;
2590         base_addr[CyCAR] = (u_char) port;
2591 #if 0
2592         while (base_addr[CyCCR])
2593                 ;
2594         base_addr[CyCCR] = CyENB_RCVR;
2595 #endif
2596         ier = base_addr[CyIER];
2597         base_addr[CyIER] = CyRxData;
2598
2599         while (1) {
2600                 if (pcc2chip[PccSCCRICR] & 0x20) {
2601                         /* We have a Rx int. Acknowledge it */
2602                         sink = pcc2chip[PccRPIACKR];
2603                         if ((base_addr[CyLICR] >> 2) == port) {
2604                                 int cnt = base_addr[CyRFOC];
2605                                 while (cnt-- > 0) {
2606                                         c = base_addr[CyRDR];
2607                                         if (c == 0)
2608                                                 printk
2609                                                     ("!! debug char is null (cnt=%d) !!",
2610                                                      cnt);
2611                                         else
2612                                                 queueDebugChar(c);
2613                                 }
2614                                 base_addr[CyREOIR] = 0;
2615                                 i = debugiq.out;
2616                                 if (i == debugiq.in)
2617                                         panic("Debug input queue empty!");
2618                                 c = debugiq.buf[i];
2619                                 if (++i == DEBUG_LEN)
2620                                         i = 0;
2621                                 debugiq.out = i;
2622                                 break;
2623                         } else
2624                                 base_addr[CyREOIR] = CyNOTRANS;
2625                 }
2626         }
2627
2628         base_addr[CyIER] = ier;
2629
2630         local_irq_restore(flags);
2631
2632         return (c);
2633 }
2634
2635 void queueDebugChar(int c)
2636 {
2637         int i;
2638
2639         i = debugiq.in;
2640         debugiq.buf[i] = c;
2641         if (++i == DEBUG_LEN)
2642                 i = 0;
2643         if (i != debugiq.out)
2644                 debugiq.in = i;
2645 }
2646
2647 static void debug_setup()
2648 {
2649         unsigned long flags;
2650         volatile unsigned char *base_addr = (u_char *) BASE_ADDR;
2651         int i, cflag;
2652
2653         cflag = B19200;
2654
2655         local_irq_save(flags);
2656
2657         for (i = 0; i < 4; i++) {
2658                 base_addr[CyCAR] = i;
2659                 base_addr[CyLICR] = i << 2;
2660         }
2661
2662         debugiq.in = debugiq.out = 0;
2663
2664         base_addr[CyCAR] = DEBUG_PORT;
2665
2666         /* baud rate */
2667         i = cflag & CBAUD;
2668
2669         base_addr[CyIER] = 0;
2670
2671         base_addr[CyCMR] = CyASYNC;
2672         base_addr[CyLICR] = DEBUG_PORT << 2;
2673         base_addr[CyLIVR] = 0x5c;
2674
2675         /* tx and rx baud rate */
2676
2677         base_addr[CyTCOR] = baud_co[i];
2678         base_addr[CyTBPR] = baud_bpr[i];
2679         base_addr[CyRCOR] = baud_co[i] >> 5;
2680         base_addr[CyRBPR] = baud_bpr[i];
2681
2682         /* set line characteristics  according configuration */
2683
2684         base_addr[CySCHR1] = 0;
2685         base_addr[CySCHR2] = 0;
2686         base_addr[CySCRL] = 0;
2687         base_addr[CySCRH] = 0;
2688         base_addr[CyCOR1] = Cy_8_BITS | CyPARITY_NONE;
2689         base_addr[CyCOR2] = 0;
2690         base_addr[CyCOR3] = Cy_1_STOP;
2691         base_addr[CyCOR4] = baud_cor4[i];
2692         base_addr[CyCOR5] = 0;
2693         base_addr[CyCOR6] = 0;
2694         base_addr[CyCOR7] = 0;
2695
2696         write_cy_cmd(base_addr, CyINIT_CHAN);
2697         write_cy_cmd(base_addr, CyENB_RCVR);
2698
2699         base_addr[CyCAR] = DEBUG_PORT;  /* !!! Is this needed? */
2700
2701         base_addr[CyRTPRL] = 2;
2702         base_addr[CyRTPRH] = 0;
2703
2704         base_addr[CyMSVR1] = CyRTS;
2705         base_addr[CyMSVR2] = CyDTR;
2706
2707         base_addr[CyIER] = CyRxData;
2708
2709         local_irq_restore(flags);
2710
2711 }                               /* debug_setup */
2712
2713 #endif
2714
2715 MODULE_LICENSE("GPL");