drivers/char/riscom8.c

   1 /*
   2  *      linux/drivers/char/riscom.c  -- RISCom/8 multiport serial driver.
   3  *
   4  *      Copyright (C) 1994-1996  Dmitry Gorodchanin (pgmdsg@ibi.com)
   5  *
   6  *      This code is loosely based on the Linux serial driver, written by
   7  *      Linus Torvalds, Theodore T'so and others. The RISCom/8 card
   8  *      programming info was obtained from various drivers for other OSes
   9  *      (FreeBSD, ISC, etc), but no source code from those drivers were
  10  *      directly included in this driver.
  11  *
  12  *
  13  *      This program is free software; you can redistribute it and/or modify
  14  *      it under the terms of the GNU General Public License as published by
  15  *      the Free Software Foundation; either version 2 of the License, or
  16  *      (at your option) any later version.
  17  *
  18  *      This program is distributed in the hope that it will be useful,
  19  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *      GNU General Public License for more details.
  22  *
  23  *      You should have received a copy of the GNU General Public License
  24  *      along with this program; if not, write to the Free Software
  25  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  *
  27  *      Revision 1.1
  28  *
  29  *      ChangeLog:
  30  *      Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 27-Jun-2001
  31  *      - get rid of check_region and several cleanups
  32  */
  33
  34 #include <linux/module.h>
  35
  36 #include <linux/io.h>
  37 #include <linux/kernel.h>
  38 #include <linux/sched.h>
  39 #include <linux/ioport.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/errno.h>
  42 #include <linux/tty.h>
  43 #include <linux/mm.h>
  44 #include <linux/serial.h>
  45 #include <linux/fcntl.h>
  46 #include <linux/major.h>
  47 #include <linux/init.h>
  48 #include <linux/delay.h>
  49 #include <linux/tty_flip.h>
  50 #include <linux/spinlock.h>
  51
  52 #include <linux/uaccess.h>
  53
  54 #include "riscom8.h"
  55 #include "riscom8_reg.h"
  56
  57 /* Am I paranoid or not ? ;-) */
  58 #define RISCOM_PARANOIA_CHECK
  59
  60 /*
  61  * Crazy InteliCom/8 boards sometimes have swapped CTS & DSR signals.
  62  * You can slightly speed up things by #undefing the following option,
  63  * if you are REALLY sure that your board is correct one.
  64  */
  65
  66 #define RISCOM_BRAIN_DAMAGED_CTS
  67
  68 /*
  69  * The following defines are mostly for testing purposes. But if you need
  70  * some nice reporting in your syslog, you can define them also.
  71  */
  72 #undef RC_REPORT_FIFO
  73 #undef RC_REPORT_OVERRUN
  74
  75
  76 #define RISCOM_LEGAL_FLAGS \
  77         (ASYNC_HUP_NOTIFY   | ASYNC_SAK          | ASYNC_SPLIT_TERMIOS   | \
  78          ASYNC_SPD_HI       | ASYNC_SPEED_VHI    | ASYNC_SESSION_LOCKOUT | \
  79          ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
  80
  81 static struct tty_driver *riscom_driver;
  82
  83 static DEFINE_SPINLOCK(riscom_lock);
  84
  85 static struct riscom_board rc_board[RC_NBOARD] =  {
  86         {
  87                 .base   = RC_IOBASE1,
  88         },
  89         {
  90                 .base   = RC_IOBASE2,
  91         },
  92         {
  93                 .base   = RC_IOBASE3,
  94         },
  95         {
  96                 .base   = RC_IOBASE4,
  97         },
  98 };
  99
 100 static struct riscom_port rc_port[RC_NBOARD * RC_NPORT];
 101
 102 /* RISCom/8 I/O ports addresses (without address translation) */
 103 static unsigned short rc_ioport[] =  {
 104 #if 1
 105         0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c,
 106 #else
 107         0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x10,
 108         0x11, 0x12, 0x18, 0x28, 0x31, 0x32, 0x39, 0x3a, 0x40, 0x41, 0x61, 0x62,
 109         0x63, 0x64, 0x6b, 0x70, 0x71, 0x78, 0x7a, 0x7b, 0x7f, 0x100, 0x101
 110 #endif
 111 };
 112 #define RC_NIOPORT      ARRAY_SIZE(rc_ioport)
 113
 114
 115 static int rc_paranoia_check(struct riscom_port const *port,
 116                                     char *name, const char *routine)
 117 {
 118 #ifdef RISCOM_PARANOIA_CHECK
 119         static const char badmagic[] = KERN_INFO
 120                 "rc: Warning: bad riscom port magic number for device %s in %s\n";
 121         static const char badinfo[] = KERN_INFO
 122                 "rc: Warning: null riscom port for device %s in %s\n";
 123
 124         if (!port) {
 125                 printk(badinfo, name, routine);
 126                 return 1;
 127         }
 128         if (port->magic != RISCOM8_MAGIC) {
 129                 printk(badmagic, name, routine);
 130                 return 1;
 131         }
 132 #endif
 133         return 0;
 134 }
 135
 136 /*
 137  *
 138  *  Service functions for RISCom/8 driver.
 139  *
 140  */
 141
 142 /* Get board number from pointer */
 143 static inline int board_No(struct riscom_board const *bp)
 144 {
 145         return bp - rc_board;
 146 }
 147
 148 /* Get port number from pointer */
 149 static inline int port_No(struct riscom_port const *port)
 150 {
 151         return RC_PORT(port - rc_port);
 152 }
 153
 154 /* Get pointer to board from pointer to port */
 155 static inline struct riscom_board *port_Board(struct riscom_port const *port)
 156 {
 157         return &rc_board[RC_BOARD(port - rc_port)];
 158 }
 159
 160 /* Input Byte from CL CD180 register */
 161 static inline unsigned char rc_in(struct riscom_board const *bp,
 162                                                         unsigned short reg)
 163 {
 164         return inb(bp->base + RC_TO_ISA(reg));
 165 }
 166
 167 /* Output Byte to CL CD180 register */
 168 static inline void rc_out(struct riscom_board const *bp, unsigned short reg,
 169                           unsigned char val)
 170 {
 171         outb(val, bp->base + RC_TO_ISA(reg));
 172 }
 173
 174 /* Wait for Channel Command Register ready */
 175 static void rc_wait_CCR(struct riscom_board const *bp)
 176 {
 177         unsigned long delay;
 178
 179         /* FIXME: need something more descriptive then 100000 :) */
 180         for (delay = 100000; delay; delay--)
 181                 if (!rc_in(bp, CD180_CCR))
 182                         return;
 183
 184         printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp));
 185 }
 186
 187 /*
 188  *  RISCom/8 probe functions.
 189  */
 190
 191 static int rc_request_io_range(struct riscom_board * const bp)
 192 {
 193         int i;
 194
 195         for (i = 0; i < RC_NIOPORT; i++)
 196                 if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1,
 197                                    "RISCom/8"))  {
 198                         goto out_release;
 199                 }
 200         return 0;
 201 out_release:
 202         printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n",
 203                          board_No(bp), bp->base);
 204         while (--i >= 0)
 205                 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
 206         return 1;
 207 }
 208
 209 static void rc_release_io_range(struct riscom_board * const bp)
 210 {
 211         int i;
 212
 213         for (i = 0; i < RC_NIOPORT; i++)
 214                 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
 215 }
 216
 217 /* Reset and setup CD180 chip */
 218 static void __init rc_init_CD180(struct riscom_board const *bp)
 219 {
 220         unsigned long flags;
 221
 222         spin_lock_irqsave(&riscom_lock, flags);
 223
 224         rc_out(bp, RC_CTOUT, 0);                   /* Clear timeout        */
 225         rc_wait_CCR(bp);                           /* Wait for CCR ready   */
 226         rc_out(bp, CD180_CCR, CCR_HARDRESET);      /* Reset CD180 chip     */
 227         spin_unlock_irqrestore(&riscom_lock, flags);
 228         msleep(50);                                /* Delay 0.05 sec       */
 229         spin_lock_irqsave(&riscom_lock, flags);
 230         rc_out(bp, CD180_GIVR, RC_ID);             /* Set ID for this chip */
 231         rc_out(bp, CD180_GICR, 0);                 /* Clear all bits       */
 232         rc_out(bp, CD180_PILR1, RC_ACK_MINT);      /* Prio for modem intr  */
 233         rc_out(bp, CD180_PILR2, RC_ACK_TINT);      /* Prio for tx intr     */
 234         rc_out(bp, CD180_PILR3, RC_ACK_RINT);      /* Prio for rx intr     */
 235
 236         /* Setting up prescaler. We need 4 ticks per 1 ms */
 237         rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8);
 238         rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff);
 239
 240         spin_unlock_irqrestore(&riscom_lock, flags);
 241 }
 242
 243 /* Main probing routine, also sets irq. */
 244 static int __init rc_probe(struct riscom_board *bp)
 245 {
 246         unsigned char val1, val2;
 247         int irqs = 0;
 248         int retries;
 249
 250         bp->irq = 0;
 251
 252         if (rc_request_io_range(bp))
 253                 return 1;
 254
 255         /* Are the I/O ports here ? */
 256         rc_out(bp, CD180_PPRL, 0x5a);
 257         outb(0xff, 0x80);
 258         val1 = rc_in(bp, CD180_PPRL);
 259         rc_out(bp, CD180_PPRL, 0xa5);
 260         outb(0x00, 0x80);
 261         val2 = rc_in(bp, CD180_PPRL);
 262
 263         if ((val1 != 0x5a) || (val2 != 0xa5))  {
 264                 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n",
 265                        board_No(bp), bp->base);
 266                 goto out_release;
 267         }
 268
 269         /* It's time to find IRQ for this board */
 270         for (retries = 0; retries < 5 && irqs <= 0; retries++) {
 271                 irqs = probe_irq_on();
 272                 rc_init_CD180(bp);               /* Reset CD180 chip         */
 273                 rc_out(bp, CD180_CAR, 2);        /* Select port 2            */
 274                 rc_wait_CCR(bp);
 275                 rc_out(bp, CD180_CCR, CCR_TXEN); /* Enable transmitter       */
 276                 rc_out(bp, CD180_IER, IER_TXRDY);/* Enable tx empty intr     */
 277                 msleep(50);
 278                 irqs = probe_irq_off(irqs);
 279                 val1 = rc_in(bp, RC_BSR);       /* Get Board Status reg      */
 280                 val2 = rc_in(bp, RC_ACK_TINT);  /* ACK interrupt             */
 281                 rc_init_CD180(bp);              /* Reset CD180 again         */
 282
 283                 if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX)))  {
 284                         printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not "
 285                                         "found.\n", board_No(bp), bp->base);
 286                         goto out_release;
 287                 }
 288         }
 289
 290         if (irqs <= 0)  {
 291                 printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board "
 292                                 "at 0x%03x.\n", board_No(bp), bp->base);
 293                 goto out_release;
 294         }
 295         bp->irq = irqs;
 296         bp->flags |= RC_BOARD_PRESENT;
 297
 298         printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at "
 299                          "0x%03x, IRQ %d.\n",
 300                board_No(bp),
 301                (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A',   /* Board revision */
 302                bp->base, bp->irq);
 303
 304         return 0;
 305 out_release:
 306         rc_release_io_range(bp);
 307         return 1;
 308 }
 309
 310 /*
 311  *
 312  *  Interrupt processing routines.
 313  *
 314  */
 315
 316 static struct riscom_port *rc_get_port(struct riscom_board const *bp,
 317                                                unsigned char const *what)
 318 {
 319         unsigned char channel;
 320         struct riscom_port *port;
 321
 322         channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF;
 323         if (channel < CD180_NCH)  {
 324                 port = &rc_port[board_No(bp) * RC_NPORT + channel];
 325                 if (port->port.flags & ASYNC_INITIALIZED)
 326                         return port;
 327         }
 328         printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n",
 329                board_No(bp), what, channel);
 330         return NULL;
 331 }
 332
 333 static void rc_receive_exc(struct riscom_board const *bp)
 334 {
 335         struct riscom_port *port;
 336         struct tty_struct *tty;
 337         unsigned char status;
 338         unsigned char ch, flag;
 339
 340         port = rc_get_port(bp, "Receive");
 341         if (port == NULL)
 342                 return;
 343
 344         tty = port->port.tty;
 345
 346 #ifdef RC_REPORT_OVERRUN
 347         status = rc_in(bp, CD180_RCSR);
 348         if (status & RCSR_OE)
 349                 port->overrun++;
 350         status &= port->mark_mask;
 351 #else
 352         status = rc_in(bp, CD180_RCSR) & port->mark_mask;
 353 #endif
 354         ch = rc_in(bp, CD180_RDR);
 355         if (!status)
 356                 return;
 357         if (status & RCSR_TOUT)  {
 358                 printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
 359                                     "Hardware problems ?\n",
 360                        board_No(bp), port_No(port));
 361                 return;
 362
 363         } else if (status & RCSR_BREAK)  {
 364                 printk(KERN_INFO "rc%d: port %d: Handling break...\n",
 365                        board_No(bp), port_No(port));
 366                 flag = TTY_BREAK;
 367                 if (port->port.flags & ASYNC_SAK)
 368                         do_SAK(tty);
 369
 370         } else if (status & RCSR_PE)
 371                 flag = TTY_PARITY;
 372
 373         else if (status & RCSR_FE)
 374                 flag = TTY_FRAME;
 375
 376         else if (status & RCSR_OE)
 377                 flag = TTY_OVERRUN;
 378         else
 379                 flag = TTY_NORMAL;
 380
 381         tty_insert_flip_char(tty, ch, flag);
 382         tty_flip_buffer_push(tty);
 383 }
 384
 385 static void rc_receive(struct riscom_board const *bp)
 386 {
 387         struct riscom_port *port;
 388         struct tty_struct *tty;
 389         unsigned char count;
 390
 391         port = rc_get_port(bp, "Receive");
 392         if (port == NULL)
 393                 return;
 394
 395         tty = port->port.tty;
 396
 397         count = rc_in(bp, CD180_RDCR);
 398
 399 #ifdef RC_REPORT_FIFO
 400         port->hits[count > 8 ? 9 : count]++;
 401 #endif
 402
 403         while (count--)  {
 404                 if (tty_buffer_request_room(tty, 1) == 0)  {
 405                         printk(KERN_WARNING "rc%d: port %d: Working around "
 406                                             "flip buffer overflow.\n",
 407                                board_No(bp), port_No(port));
 408                         break;
 409                 }
 410                 tty_insert_flip_char(tty, rc_in(bp, CD180_RDR), TTY_NORMAL);
 411         }
 412         tty_flip_buffer_push(tty);
 413 }
 414
 415 static void rc_transmit(struct riscom_board const *bp)
 416 {
 417         struct riscom_port *port;
 418         struct tty_struct *tty;
 419         unsigned char count;
 420
 421         port = rc_get_port(bp, "Transmit");
 422         if (port == NULL)
 423                 return;
 424
 425         tty = port->port.tty;
 426
 427         if (port->IER & IER_TXEMPTY) {
 428                 /* FIFO drained */
 429                 rc_out(bp, CD180_CAR, port_No(port));
 430                 port->IER &= ~IER_TXEMPTY;
 431                 rc_out(bp, CD180_IER, port->IER);
 432                 return;
 433         }
 434
 435         if ((port->xmit_cnt <= 0 && !port->break_length)
 436             || tty->stopped || tty->hw_stopped)  {
 437                 rc_out(bp, CD180_CAR, port_No(port));
 438                 port->IER &= ~IER_TXRDY;
 439                 rc_out(bp, CD180_IER, port->IER);
 440                 return;
 441         }
 442
 443         if (port->break_length)  {
 444                 if (port->break_length > 0)  {
 445                         if (port->COR2 & COR2_ETC)  {
 446                                 rc_out(bp, CD180_TDR, CD180_C_ESC);
 447                                 rc_out(bp, CD180_TDR, CD180_C_SBRK);
 448                                 port->COR2 &= ~COR2_ETC;
 449                         }
 450                         count = min_t(int, port->break_length, 0xff);
 451                         rc_out(bp, CD180_TDR, CD180_C_ESC);
 452                         rc_out(bp, CD180_TDR, CD180_C_DELAY);
 453                         rc_out(bp, CD180_TDR, count);
 454                         port->break_length -= count;
 455                         if (port->break_length == 0)
 456                                 port->break_length--;
 457                 } else  {
 458                         rc_out(bp, CD180_TDR, CD180_C_ESC);
 459                         rc_out(bp, CD180_TDR, CD180_C_EBRK);
 460                         rc_out(bp, CD180_COR2, port->COR2);
 461                         rc_wait_CCR(bp);
 462                         rc_out(bp, CD180_CCR, CCR_CORCHG2);
 463                         port->break_length = 0;
 464                 }
 465                 return;
 466         }
 467
 468         count = CD180_NFIFO;
 469         do {
 470                 rc_out(bp, CD180_TDR, port->port.xmit_buf[port->xmit_tail++]);
 471                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
 472                 if (--port->xmit_cnt <= 0)
 473                         break;
 474         } while (--count > 0);
 475
 476         if (port->xmit_cnt <= 0)  {
 477                 rc_out(bp, CD180_CAR, port_No(port));
 478                 port->IER &= ~IER_TXRDY;
 479                 rc_out(bp, CD180_IER, port->IER);
 480         }
 481         if (port->xmit_cnt <= port->wakeup_chars)
 482                 tty_wakeup(tty);
 483 }
 484
 485 static void rc_check_modem(struct riscom_board const *bp)
 486 {
 487         struct riscom_port *port;
 488         struct tty_struct *tty;
 489         unsigned char mcr;
 490
 491         port = rc_get_port(bp, "Modem");
 492         if (port == NULL)
 493                 return;
 494
 495         tty = port->port.tty;
 496
 497         mcr = rc_in(bp, CD180_MCR);
 498         if (mcr & MCR_CDCHG) {
 499                 if (rc_in(bp, CD180_MSVR) & MSVR_CD)
 500                         wake_up_interruptible(&port->port.open_wait);
 501                 else
 502                         tty_hangup(tty);
 503         }
 504
 505 #ifdef RISCOM_BRAIN_DAMAGED_CTS
 506         if (mcr & MCR_CTSCHG)  {
 507                 if (rc_in(bp, CD180_MSVR) & MSVR_CTS)  {
 508                         tty->hw_stopped = 0;
 509                         port->IER |= IER_TXRDY;
 510                         if (port->xmit_cnt <= port->wakeup_chars)
 511                                 tty_wakeup(tty);
 512                 } else  {
 513                         tty->hw_stopped = 1;
 514                         port->IER &= ~IER_TXRDY;
 515                 }
 516                 rc_out(bp, CD180_IER, port->IER);
 517         }
 518         if (mcr & MCR_DSRCHG)  {
 519                 if (rc_in(bp, CD180_MSVR) & MSVR_DSR)  {
 520                         tty->hw_stopped = 0;
 521                         port->IER |= IER_TXRDY;
 522                         if (port->xmit_cnt <= port->wakeup_chars)
 523                                 tty_wakeup(tty);
 524                 } else  {
 525                         tty->hw_stopped = 1;
 526                         port->IER &= ~IER_TXRDY;
 527                 }
 528                 rc_out(bp, CD180_IER, port->IER);
 529         }
 530 #endif /* RISCOM_BRAIN_DAMAGED_CTS */
 531
 532         /* Clear change bits */
 533         rc_out(bp, CD180_MCR, 0);
 534 }
 535
 536 /* The main interrupt processing routine */
 537 static irqreturn_t rc_interrupt(int dummy, void *dev_id)
 538 {
 539         unsigned char status;
 540         unsigned char ack;
 541         struct riscom_board *bp = dev_id;
 542         unsigned long loop = 0;
 543         int handled = 0;
 544
 545         if (!(bp->flags & RC_BOARD_ACTIVE))
 546                 return IRQ_NONE;
 547
 548         while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
 549                                  (RC_BSR_TOUT | RC_BSR_TINT |
 550                                   RC_BSR_MINT | RC_BSR_RINT))) {
 551                 handled = 1;
 552                 if (status & RC_BSR_TOUT)
 553                         printk(KERN_WARNING "rc%d: Got timeout. Hardware "
 554                                             "error?\n", board_No(bp));
 555                 else if (status & RC_BSR_RINT) {
 556                         ack = rc_in(bp, RC_ACK_RINT);
 557                         if (ack == (RC_ID | GIVR_IT_RCV))
 558                                 rc_receive(bp);
 559                         else if (ack == (RC_ID | GIVR_IT_REXC))
 560                                 rc_receive_exc(bp);
 561                         else
 562                                 printk(KERN_WARNING "rc%d: Bad receive ack "
 563                                                     "0x%02x.\n",
 564                                        board_No(bp), ack);
 565                 } else if (status & RC_BSR_TINT) {
 566                         ack = rc_in(bp, RC_ACK_TINT);
 567                         if (ack == (RC_ID | GIVR_IT_TX))
 568                                 rc_transmit(bp);
 569                         else
 570                                 printk(KERN_WARNING "rc%d: Bad transmit ack "
 571                                                     "0x%02x.\n",
 572                                        board_No(bp), ack);
 573                 } else /* if (status & RC_BSR_MINT) */ {
 574                         ack = rc_in(bp, RC_ACK_MINT);
 575                         if (ack == (RC_ID | GIVR_IT_MODEM))
 576                                 rc_check_modem(bp);
 577                         else
 578                                 printk(KERN_WARNING "rc%d: Bad modem ack "
 579                                                     "0x%02x.\n",
 580                                        board_No(bp), ack);
 581                 }
 582                 rc_out(bp, CD180_EOIR, 0);   /* Mark end of interrupt */
 583                 rc_out(bp, RC_CTOUT, 0);     /* Clear timeout flag    */
 584         }
 585         return IRQ_RETVAL(handled);
 586 }
 587
 588 /*
 589  *  Routines for open & close processing.
 590  */
 591
 592 /* Called with disabled interrupts */
 593 static int rc_setup_board(struct riscom_board *bp)
 594 {
 595         int error;
 596
 597         if (bp->flags & RC_BOARD_ACTIVE)
 598                 return 0;
 599
 600         error = request_irq(bp->irq, rc_interrupt, IRQF_DISABLED,
 601                             "RISCom/8", bp);
 602         if (error)
 603                 return error;
 604
 605         rc_out(bp, RC_CTOUT, 0);                /* Just in case         */
 606         bp->DTR = ~0;
 607         rc_out(bp, RC_DTR, bp->DTR);            /* Drop DTR on all ports */
 608
 609         bp->flags |= RC_BOARD_ACTIVE;
 610
 611         return 0;
 612 }
 613
 614 /* Called with disabled interrupts */
 615 static void rc_shutdown_board(struct riscom_board *bp)
 616 {
 617         if (!(bp->flags & RC_BOARD_ACTIVE))
 618                 return;
 619
 620         bp->flags &= ~RC_BOARD_ACTIVE;
 621
 622         free_irq(bp->irq, NULL);
 623
 624         bp->DTR = ~0;
 625         rc_out(bp, RC_DTR, bp->DTR);           /* Drop DTR on all ports */
 626
 627 }
 628
 629 /*
 630  * Setting up port characteristics.
 631  * Must be called with disabled interrupts
 632  */
 633 static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
 634 {
 635         struct tty_struct *tty = port->port.tty;
 636         unsigned long baud;
 637         long tmp;
 638         unsigned char cor1 = 0, cor3 = 0;
 639         unsigned char mcor1 = 0, mcor2 = 0;
 640
 641         port->IER  = 0;
 642         port->COR2 = 0;
 643         port->MSVR = MSVR_RTS;
 644
 645         baud = tty_get_baud_rate(tty);
 646
 647         /* Select port on the board */
 648         rc_out(bp, CD180_CAR, port_No(port));
 649
 650         if (!baud)  {
 651                 /* Drop DTR & exit */
 652                 bp->DTR |= (1u << port_No(port));
 653                 rc_out(bp, RC_DTR, bp->DTR);
 654                 return;
 655         } else  {
 656                 /* Set DTR on */
 657                 bp->DTR &= ~(1u << port_No(port));
 658                 rc_out(bp, RC_DTR, bp->DTR);
 659         }
 660
 661         /*
 662          * Now we must calculate some speed depended things
 663          */
 664
 665         /* Set baud rate for port */
 666         tmp = (((RC_OSCFREQ + baud/2) / baud +
 667                 CD180_TPC/2) / CD180_TPC);
 668
 669         rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff);
 670         rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff);
 671         rc_out(bp, CD180_RBPRL, tmp & 0xff);
 672         rc_out(bp, CD180_TBPRL, tmp & 0xff);
 673
 674         baud = (baud + 5) / 10;   /* Estimated CPS */
 675
 676         /* Two timer ticks seems enough to wakeup something like SLIP driver */
 677         tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;
 678         port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
 679                                               SERIAL_XMIT_SIZE - 1 : tmp);
 680
 681         /* Receiver timeout will be transmission time for 1.5 chars */
 682         tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
 683         tmp = (tmp > 0xff) ? 0xff : tmp;
 684         rc_out(bp, CD180_RTPR, tmp);
 685
 686         switch (C_CSIZE(tty)) {
 687         case CS5:
 688                 cor1 |= COR1_5BITS;
 689                 break;
 690         case CS6:
 691                 cor1 |= COR1_6BITS;
 692                 break;
 693         case CS7:
 694                 cor1 |= COR1_7BITS;
 695                 break;
 696         case CS8:
 697                 cor1 |= COR1_8BITS;
 698                 break;
 699         }
 700         if (C_CSTOPB(tty))
 701                 cor1 |= COR1_2SB;
 702
 703         cor1 |= COR1_IGNORE;
 704         if (C_PARENB(tty)) {
 705                 cor1 |= COR1_NORMPAR;
 706                 if (C_PARODD(tty))
 707                         cor1 |= COR1_ODDP;
 708                 if (I_INPCK(tty))
 709                         cor1 &= ~COR1_IGNORE;
 710         }
 711         /* Set marking of some errors */
 712         port->mark_mask = RCSR_OE | RCSR_TOUT;
 713         if (I_INPCK(tty))
 714                 port->mark_mask |= RCSR_FE | RCSR_PE;
 715         if (I_BRKINT(tty) || I_PARMRK(tty))
 716                 port->mark_mask |= RCSR_BREAK;
 717         if (I_IGNPAR(tty))
 718                 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
 719         if (I_IGNBRK(tty)) {
 720                 port->mark_mask &= ~RCSR_BREAK;
 721                 if (I_IGNPAR(tty))
 722                         /* Real raw mode. Ignore all */
 723                         port->mark_mask &= ~RCSR_OE;
 724         }
 725         /* Enable Hardware Flow Control */
 726         if (C_CRTSCTS(tty))  {
 727 #ifdef RISCOM_BRAIN_DAMAGED_CTS
 728                 port->IER |= IER_DSR | IER_CTS;
 729                 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
 730                 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
 731                 tty->hw_stopped = !(rc_in(bp, CD180_MSVR) &
 732                                                 (MSVR_CTS|MSVR_DSR));
 733 #else
 734                 port->COR2 |= COR2_CTSAE;
 735 #endif
 736         }
 737         /* Enable Software Flow Control. FIXME: I'm not sure about this */
 738         /* Some people reported that it works, but I still doubt */
 739         if (I_IXON(tty))  {
 740                 port->COR2 |= COR2_TXIBE;
 741                 cor3 |= (COR3_FCT | COR3_SCDE);
 742                 if (I_IXANY(tty))
 743                         port->COR2 |= COR2_IXM;
 744                 rc_out(bp, CD180_SCHR1, START_CHAR(tty));
 745                 rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
 746                 rc_out(bp, CD180_SCHR3, START_CHAR(tty));
 747                 rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
 748         }
 749         if (!C_CLOCAL(tty))  {
 750                 /* Enable CD check */
 751                 port->IER |= IER_CD;
 752                 mcor1 |= MCOR1_CDZD;
 753                 mcor2 |= MCOR2_CDOD;
 754         }
 755
 756         if (C_CREAD(tty))
 757                 /* Enable receiver */
 758                 port->IER |= IER_RXD;
 759
 760         /* Set input FIFO size (1-8 bytes) */
 761         cor3 |= RISCOM_RXFIFO;
 762         /* Setting up CD180 channel registers */
 763         rc_out(bp, CD180_COR1, cor1);
 764         rc_out(bp, CD180_COR2, port->COR2);
 765         rc_out(bp, CD180_COR3, cor3);
 766         /* Make CD180 know about registers change */
 767         rc_wait_CCR(bp);
 768         rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
 769         /* Setting up modem option registers */
 770         rc_out(bp, CD180_MCOR1, mcor1);
 771         rc_out(bp, CD180_MCOR2, mcor2);
 772         /* Enable CD180 transmitter & receiver */
 773         rc_wait_CCR(bp);
 774         rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
 775         /* Enable interrupts */
 776         rc_out(bp, CD180_IER, port->IER);
 777         /* And finally set RTS on */
 778         rc_out(bp, CD180_MSVR, port->MSVR);
 779 }
 780
 781 /* Must be called with interrupts enabled */
 782 static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
 783 {
 784         unsigned long flags;
 785
 786         if (port->port.flags & ASYNC_INITIALIZED)
 787                 return 0;
 788
 789         if (tty_port_alloc_xmit_buf(&port->port) < 0)
 790                 return -ENOMEM;
 791
 792         spin_lock_irqsave(&riscom_lock, flags);
 793
 794         clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
 795         if (port->port.count == 1)
 796                 bp->count++;
 797         port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
 798         rc_change_speed(bp, port);
 799         port->port.flags |= ASYNC_INITIALIZED;
 800
 801         spin_unlock_irqrestore(&riscom_lock, flags);
 802         return 0;
 803 }
 804
 805 /* Must be called with interrupts disabled */
 806 static void rc_shutdown_port(struct tty_struct *tty,
 807                         struct riscom_board *bp, struct riscom_port *port)
 808 {
 809         if (!(port->port.flags & ASYNC_INITIALIZED))
 810                 return;
 811
 812 #ifdef RC_REPORT_OVERRUN
 813         printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
 814                board_No(bp), port_No(port), port->overrun);
 815 #endif
 816 #ifdef RC_REPORT_FIFO
 817         {
 818                 int i;
 819
 820                 printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
 821                        board_No(bp), port_No(port));
 822                 for (i = 0; i < 10; i++)
 823                         printk("%ld ", port->hits[i]);
 824                 printk("].\n");
 825         }
 826 #endif
 827         tty_port_free_xmit_buf(&port->port);
 828         if (C_HUPCL(tty)) {
 829                 /* Drop DTR */
 830                 bp->DTR |= (1u << port_No(port));
 831                 rc_out(bp, RC_DTR, bp->DTR);
 832         }
 833
 834         /* Select port */
 835         rc_out(bp, CD180_CAR, port_No(port));
 836         /* Reset port */
 837         rc_wait_CCR(bp);
 838         rc_out(bp, CD180_CCR, CCR_SOFTRESET);
 839         /* Disable all interrupts from this port */
 840         port->IER = 0;
 841         rc_out(bp, CD180_IER, port->IER);
 842
 843         set_bit(TTY_IO_ERROR, &tty->flags);
 844         port->port.flags &= ~ASYNC_INITIALIZED;
 845
 846         if (--bp->count < 0)  {
 847                 printk(KERN_INFO "rc%d: rc_shutdown_port: "
 848                                  "bad board count: %d\n",
 849                        board_No(bp), bp->count);
 850                 bp->count = 0;
 851         }
 852         /*
 853          * If this is the last opened port on the board
 854          * shutdown whole board
 855          */
 856         if (!bp->count)
 857                 rc_shutdown_board(bp);
 858 }
 859
 860 static int carrier_raised(struct tty_port *port)
 861 {
 862         struct riscom_port *p = container_of(port, struct riscom_port, port);
 863         struct riscom_board *bp = port_Board(p);
 864         unsigned long flags;
 865         int CD;
 866
 867         spin_lock_irqsave(&riscom_lock, flags);
 868         rc_out(bp, CD180_CAR, port_No(p));
 869         CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
 870         rc_out(bp, CD180_MSVR, MSVR_RTS);
 871         bp->DTR &= ~(1u << port_No(p));
 872         rc_out(bp, RC_DTR, bp->DTR);
 873         spin_unlock_irqrestore(&riscom_lock, flags);
 874         return CD;
 875 }
 876
 877 static int rc_open(struct tty_struct *tty, struct file *filp)
 878 {
 879         int board;
 880         int error;
 881         struct riscom_port *port;
 882         struct riscom_board *bp;
 883
 884         board = RC_BOARD(tty->index);
 885         if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
 886                 return -ENODEV;
 887
 888         bp = &rc_board[board];
 889         port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
 890         if (rc_paranoia_check(port, tty->name, "rc_open"))
 891                 return -ENODEV;
 892
 893         error = rc_setup_board(bp);
 894         if (error)
 895                 return error;
 896
 897         port->port.count++;
 898         tty->driver_data = port;
 899         port->port.tty = tty;
 900
 901         error = rc_setup_port(bp, port);
 902         if (error == 0)
 903                 error = tty_port_block_til_ready(&port->port, tty, filp);
 904         return error;
 905 }
 906
 907 static void rc_flush_buffer(struct tty_struct *tty)
 908 {
 909         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
 910         unsigned long flags;
 911
 912         if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
 913                 return;
 914
 915         spin_lock_irqsave(&riscom_lock, flags);
 916         port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
 917         spin_unlock_irqrestore(&riscom_lock, flags);
 918
 919         tty_wakeup(tty);
 920 }
 921
 922 static void rc_close(struct tty_struct *tty, struct file *filp)
 923 {
 924         struct riscom_port *port = (struct riscom_port *) tty->driver_data;
 925         struct riscom_board *bp;
 926         unsigned long flags;
 927         unsigned long timeout;
 928
 929         if (!port || rc_paranoia_check(port, tty->name, "close"))
 930                 return;
 931
 932         spin_lock_irqsave(&port->port.lock, flags);
 933
 934         if (tty_hung_up_p(filp))
 935                 goto out;
 936
 937         bp = port_Board(port);
 938         if ((tty->count == 1) && (port->port.count != 1))  {
 939                 printk(KERN_INFO "rc%d: rc_close: bad port count;"
 940                        " tty->count is 1, port count is %d\n",
 941                        board_No(bp), port->port.count);
 942                 port->port.count = 1;
 943         }
 944         if (--port->port.count < 0)  {
 945                 printk(KERN_INFO "rc%d: rc_close: bad port count "
 946                                  "for tty%d: %d\n",
 947                        board_No(bp), port_No(port), port->port.count);
 948                 port->port.count = 0;
 949         }
 950         if (port->port.count)
 951                 goto out;
 952         port->port.flags |= ASYNC_CLOSING;
 953         /*
 954          * Now we wait for the transmit buffer to clear; and we notify
 955          * the line discipline to only process XON/XOFF characters.
 956          */
 957         tty->closing = 1;
 958         spin_unlock_irqrestore(&port->port.lock, flags);
 959         if (port->port.closing_wait != ASYNC_CLOSING_WAIT_NONE)
 960                 tty_wait_until_sent(tty, port->port.closing_wait);
 961         /*
 962          * At this point we stop accepting input.  To do this, we
 963          * disable the receive line status interrupts, and tell the
 964          * interrupt driver to stop checking the data ready bit in the
 965          * line status register.
 966          */
 967
 968         spin_lock_irqsave(&riscom_lock, flags);
 969         port->IER &= ~IER_RXD;
 970         if (port->port.flags & ASYNC_INITIALIZED) {
 971                 port->IER &= ~IER_TXRDY;
 972                 port->IER |= IER_TXEMPTY;
 973                 rc_out(bp, CD180_CAR, port_No(port));
 974                 rc_out(bp, CD180_IER, port->IER);
 975                 /*
 976                  * Before we drop DTR, make sure the UART transmitter
 977                  * has completely drained; this is especially
 978                  * important if there is a transmit FIFO!
 979                  */
 980                 timeout = jiffies + HZ;
 981                 while (port->IER & IER_TXEMPTY) {
 982                         spin_unlock_irqrestore(&riscom_lock, flags);
 983                         msleep_interruptible(jiffies_to_msecs(port->timeout));
 984                         spin_lock_irqsave(&riscom_lock, flags);
 985                         if (time_after(jiffies, timeout))
 986                                 break;
 987                 }
 988         }
 989         rc_shutdown_port(tty, bp, port);
 990         rc_flush_buffer(tty);
 991         spin_unlock_irqrestore(&riscom_lock, flags);
 992         tty_ldisc_flush(tty);
 993
 994         spin_lock_irqsave(&port->port.lock, flags);
 995         tty->closing = 0;
 996         port->port.tty = NULL;
 997         if (port->port.blocked_open) {
 998                 spin_unlock_irqrestore(&port->port.lock, flags);
 999                 if (port->port.close_delay)
1000                         msleep_interruptible(jiffies_to_msecs(port->port.close_delay));
1001                 wake_up_interruptible(&port->port.open_wait);
1002                 spin_lock_irqsave(&port->port.lock, flags);
1003         }
1004         port->port.flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1005         wake_up_interruptible(&port->port.close_wait);
1006
1007 out:
1008         spin_unlock_irqrestore(&riscom_lock, flags);
1009 }
1010
1011 static int rc_write(struct tty_struct *tty,
1012                     const unsigned char *buf, int count)
1013 {
1014         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1015         struct riscom_board *bp;
1016         int c, total = 0;
1017         unsigned long flags;
1018
1019         if (rc_paranoia_check(port, tty->name, "rc_write"))
1020                 return 0;
1021
1022         bp = port_Board(port);
1023
1024         while (1) {
1025                 spin_lock_irqsave(&riscom_lock, flags);
1026
1027                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
1028                                           SERIAL_XMIT_SIZE - port->xmit_head));
1029                 if (c <= 0)
1030                         break;  /* lock continues to be held */
1031
1032                 memcpy(port->port.xmit_buf + port->xmit_head, buf, c);
1033                 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
1034                 port->xmit_cnt += c;
1035
1036                 spin_unlock_irqrestore(&riscom_lock, flags);
1037
1038                 buf += c;
1039                 count -= c;
1040                 total += c;
1041         }
1042
1043         if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1044             !(port->IER & IER_TXRDY)) {
1045                 port->IER |= IER_TXRDY;
1046                 rc_out(bp, CD180_CAR, port_No(port));
1047                 rc_out(bp, CD180_IER, port->IER);
1048         }
1049
1050         spin_unlock_irqrestore(&riscom_lock, flags);
1051
1052         return total;
1053 }
1054
1055 static int rc_put_char(struct tty_struct *tty, unsigned char ch)
1056 {
1057         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1058         unsigned long flags;
1059         int ret = 0;
1060
1061         if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1062                 return 0;
1063
1064         spin_lock_irqsave(&riscom_lock, flags);
1065
1066         if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1067                 goto out;
1068
1069         port->port.xmit_buf[port->xmit_head++] = ch;
1070         port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1071         port->xmit_cnt++;
1072         ret = 1;
1073
1074 out:
1075         spin_unlock_irqrestore(&riscom_lock, flags);
1076         return ret;
1077 }
1078
1079 static void rc_flush_chars(struct tty_struct *tty)
1080 {
1081         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1082         unsigned long flags;
1083
1084         if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1085                 return;
1086
1087         if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped)
1088                 return;
1089
1090         spin_lock_irqsave(&riscom_lock, flags);
1091
1092         port->IER |= IER_TXRDY;
1093         rc_out(port_Board(port), CD180_CAR, port_No(port));
1094         rc_out(port_Board(port), CD180_IER, port->IER);
1095
1096         spin_unlock_irqrestore(&riscom_lock, flags);
1097 }
1098
1099 static int rc_write_room(struct tty_struct *tty)
1100 {
1101         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1102         int     ret;
1103
1104         if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1105                 return 0;
1106
1107         ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1108         if (ret < 0)
1109                 ret = 0;
1110         return ret;
1111 }
1112
1113 static int rc_chars_in_buffer(struct tty_struct *tty)
1114 {
1115         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1116
1117         if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1118                 return 0;
1119
1120         return port->xmit_cnt;
1121 }
1122
1123 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1124 {
1125         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1126         struct riscom_board *bp;
1127         unsigned char status;
1128         unsigned int result;
1129         unsigned long flags;
1130
1131         if (rc_paranoia_check(port, tty->name, __func__))
1132                 return -ENODEV;
1133
1134         bp = port_Board(port);
1135
1136         spin_lock_irqsave(&riscom_lock, flags);
1137
1138         rc_out(bp, CD180_CAR, port_No(port));
1139         status = rc_in(bp, CD180_MSVR);
1140         result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1141
1142         spin_unlock_irqrestore(&riscom_lock, flags);
1143
1144         result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1145                 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1146                 | ((status & MSVR_CD)  ? TIOCM_CAR : 0)
1147                 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1148                 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1149         return result;
1150 }
1151
1152 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1153                        unsigned int set, unsigned int clear)
1154 {
1155         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1156         unsigned long flags;
1157         struct riscom_board *bp;
1158
1159         if (rc_paranoia_check(port, tty->name, __func__))
1160                 return -ENODEV;
1161
1162         bp = port_Board(port);
1163
1164         spin_lock_irqsave(&riscom_lock, flags);
1165
1166         if (set & TIOCM_RTS)
1167                 port->MSVR |= MSVR_RTS;
1168         if (set & TIOCM_DTR)
1169                 bp->DTR &= ~(1u << port_No(port));
1170
1171         if (clear & TIOCM_RTS)
1172                 port->MSVR &= ~MSVR_RTS;
1173         if (clear & TIOCM_DTR)
1174                 bp->DTR |= (1u << port_No(port));
1175
1176         rc_out(bp, CD180_CAR, port_No(port));
1177         rc_out(bp, CD180_MSVR, port->MSVR);
1178         rc_out(bp, RC_DTR, bp->DTR);
1179
1180         spin_unlock_irqrestore(&riscom_lock, flags);
1181
1182         return 0;
1183 }
1184
1185 static int rc_send_break(struct tty_struct *tty, int length)
1186 {
1187         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1188         struct riscom_board *bp = port_Board(port);
1189         unsigned long flags;
1190
1191         if (length == 0 || length == -1)
1192                 return -EOPNOTSUPP;
1193
1194         spin_lock_irqsave(&riscom_lock, flags);
1195
1196         port->break_length = RISCOM_TPS / HZ * length;
1197         port->COR2 |= COR2_ETC;
1198         port->IER  |= IER_TXRDY;
1199         rc_out(bp, CD180_CAR, port_No(port));
1200         rc_out(bp, CD180_COR2, port->COR2);
1201         rc_out(bp, CD180_IER, port->IER);
1202         rc_wait_CCR(bp);
1203         rc_out(bp, CD180_CCR, CCR_CORCHG2);
1204         rc_wait_CCR(bp);
1205
1206         spin_unlock_irqrestore(&riscom_lock, flags);
1207         return 0;
1208 }
1209
1210 static int rc_set_serial_info(struct riscom_port *port,
1211                                      struct serial_struct __user *newinfo)
1212 {
1213         struct serial_struct tmp;
1214         struct riscom_board *bp = port_Board(port);
1215         int change_speed;
1216
1217         if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1218                 return -EFAULT;
1219
1220 #if 0
1221         if ((tmp.irq != bp->irq) ||
1222             (tmp.port != bp->base) ||
1223             (tmp.type != PORT_CIRRUS) ||
1224             (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
1225             (tmp.custom_divisor != 0) ||
1226             (tmp.xmit_fifo_size != CD180_NFIFO) ||
1227             (tmp.flags & ~RISCOM_LEGAL_FLAGS))
1228                 return -EINVAL;
1229 #endif
1230
1231         change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
1232                         (tmp.flags & ASYNC_SPD_MASK));
1233
1234         if (!capable(CAP_SYS_ADMIN)) {
1235                 if ((tmp.close_delay != port->port.close_delay) ||
1236                     (tmp.closing_wait != port->port.closing_wait) ||
1237                     ((tmp.flags & ~ASYNC_USR_MASK) !=
1238                      (port->port.flags & ~ASYNC_USR_MASK)))
1239                         return -EPERM;
1240                 port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
1241                                (tmp.flags & ASYNC_USR_MASK));
1242         } else  {
1243                 port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
1244                                (tmp.flags & ASYNC_FLAGS));
1245                 port->port.close_delay = tmp.close_delay;
1246                 port->port.closing_wait = tmp.closing_wait;
1247         }
1248         if (change_speed)  {
1249                 unsigned long flags;
1250
1251                 spin_lock_irqsave(&riscom_lock, flags);
1252                 rc_change_speed(bp, port);
1253                 spin_unlock_irqrestore(&riscom_lock, flags);
1254         }
1255         return 0;
1256 }
1257
1258 static int rc_get_serial_info(struct riscom_port *port,
1259                                      struct serial_struct __user *retinfo)
1260 {
1261         struct serial_struct tmp;
1262         struct riscom_board *bp = port_Board(port);
1263
1264         memset(&tmp, 0, sizeof(tmp));
1265         tmp.type = PORT_CIRRUS;
1266         tmp.line = port - rc_port;
1267         tmp.port = bp->base;
1268         tmp.irq  = bp->irq;
1269         tmp.flags = port->port.flags;
1270         tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1271         tmp.close_delay = port->port.close_delay * HZ/100;
1272         tmp.closing_wait = port->port.closing_wait * HZ/100;
1273         tmp.xmit_fifo_size = CD180_NFIFO;
1274         return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1275 }
1276
1277 static int rc_ioctl(struct tty_struct *tty, struct file *filp,
1278                     unsigned int cmd, unsigned long arg)
1279 {
1280         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1281         void __user *argp = (void __user *)arg;
1282         int retval;
1283
1284         if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1285                 return -ENODEV;
1286
1287         switch (cmd) {
1288         case TIOCGSERIAL:
1289                 lock_kernel();
1290                 retval = rc_get_serial_info(port, argp);
1291                 unlock_kernel();
1292                 break;
1293         case TIOCSSERIAL:
1294                 lock_kernel();
1295                 retval = rc_set_serial_info(port, argp);
1296                 unlock_kernel();
1297                 break;
1298         default:
1299                 retval = -ENOIOCTLCMD;
1300         }
1301         return retval;
1302 }
1303
1304 static void rc_throttle(struct tty_struct *tty)
1305 {
1306         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1307         struct riscom_board *bp;
1308         unsigned long flags;
1309
1310         if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1311                 return;
1312         bp = port_Board(port);
1313
1314         spin_lock_irqsave(&riscom_lock, flags);
1315         port->MSVR &= ~MSVR_RTS;
1316         rc_out(bp, CD180_CAR, port_No(port));
1317         if (I_IXOFF(tty)) {
1318                 rc_wait_CCR(bp);
1319                 rc_out(bp, CD180_CCR, CCR_SSCH2);
1320                 rc_wait_CCR(bp);
1321         }
1322         rc_out(bp, CD180_MSVR, port->MSVR);
1323         spin_unlock_irqrestore(&riscom_lock, flags);
1324 }
1325
1326 static void rc_unthrottle(struct tty_struct *tty)
1327 {
1328         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1329         struct riscom_board *bp;
1330         unsigned long flags;
1331
1332         if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1333                 return;
1334         bp = port_Board(port);
1335
1336         spin_lock_irqsave(&riscom_lock, flags);
1337         port->MSVR |= MSVR_RTS;
1338         rc_out(bp, CD180_CAR, port_No(port));
1339         if (I_IXOFF(tty))  {
1340                 rc_wait_CCR(bp);
1341                 rc_out(bp, CD180_CCR, CCR_SSCH1);
1342                 rc_wait_CCR(bp);
1343         }
1344         rc_out(bp, CD180_MSVR, port->MSVR);
1345         spin_unlock_irqrestore(&riscom_lock, flags);
1346 }
1347
1348 static void rc_stop(struct tty_struct *tty)
1349 {
1350         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1351         struct riscom_board *bp;
1352         unsigned long flags;
1353
1354         if (rc_paranoia_check(port, tty->name, "rc_stop"))
1355                 return;
1356
1357         bp = port_Board(port);
1358
1359         spin_lock_irqsave(&riscom_lock, flags);
1360         port->IER &= ~IER_TXRDY;
1361         rc_out(bp, CD180_CAR, port_No(port));
1362         rc_out(bp, CD180_IER, port->IER);
1363         spin_unlock_irqrestore(&riscom_lock, flags);
1364 }
1365
1366 static void rc_start(struct tty_struct *tty)
1367 {
1368         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1369         struct riscom_board *bp;
1370         unsigned long flags;
1371
1372         if (rc_paranoia_check(port, tty->name, "rc_start"))
1373                 return;
1374
1375         bp = port_Board(port);
1376
1377         spin_lock_irqsave(&riscom_lock, flags);
1378
1379         if (port->xmit_cnt && port->port.xmit_buf && !(port->IER & IER_TXRDY)) {
1380                 port->IER |= IER_TXRDY;
1381                 rc_out(bp, CD180_CAR, port_No(port));
1382                 rc_out(bp, CD180_IER, port->IER);
1383         }
1384         spin_unlock_irqrestore(&riscom_lock, flags);
1385 }
1386
1387 static void rc_hangup(struct tty_struct *tty)
1388 {
1389         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1390         struct riscom_board *bp;
1391         unsigned long flags;
1392
1393         if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1394                 return;
1395
1396         bp = port_Board(port);
1397
1398         rc_shutdown_port(tty, bp, port);
1399         spin_lock_irqsave(&port->port.lock, flags);
1400         port->port.count = 0;
1401         port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
1402         port->port.tty = NULL;
1403         wake_up_interruptible(&port->port.open_wait);
1404         spin_unlock_irqrestore(&port->port.lock, flags);
1405 }
1406
1407 static void rc_set_termios(struct tty_struct *tty,
1408                                         struct ktermios *old_termios)
1409 {
1410         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1411         unsigned long flags;
1412
1413         if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1414                 return;
1415
1416         spin_lock_irqsave(&riscom_lock, flags);
1417         rc_change_speed(port_Board(port), port);
1418         spin_unlock_irqrestore(&riscom_lock, flags);
1419
1420         if ((old_termios->c_cflag & CRTSCTS) &&
1421             !(tty->termios->c_cflag & CRTSCTS)) {
1422                 tty->hw_stopped = 0;
1423                 rc_start(tty);
1424         }
1425 }
1426
1427 static const struct tty_operations riscom_ops = {
1428         .open  = rc_open,
1429         .close = rc_close,
1430         .write = rc_write,
1431         .put_char = rc_put_char,
1432         .flush_chars = rc_flush_chars,
1433         .write_room = rc_write_room,
1434         .chars_in_buffer = rc_chars_in_buffer,
1435         .flush_buffer = rc_flush_buffer,
1436         .ioctl = rc_ioctl,
1437         .throttle = rc_throttle,
1438         .unthrottle = rc_unthrottle,
1439         .set_termios = rc_set_termios,
1440         .stop = rc_stop,
1441         .start = rc_start,
1442         .hangup = rc_hangup,
1443         .tiocmget = rc_tiocmget,
1444         .tiocmset = rc_tiocmset,
1445         .break_ctl = rc_send_break,
1446 };
1447
1448 static const struct tty_port_operations riscom_port_ops = {
1449         .carrier_raised = carrier_raised,
1450 };
1451
1452
1453 static int __init rc_init_drivers(void)
1454 {
1455         int error;
1456         int i;
1457
1458         riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1459         if (!riscom_driver)
1460                 return -ENOMEM;
1461
1462         riscom_driver->owner = THIS_MODULE;
1463         riscom_driver->name = "ttyL";
1464         riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1465         riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1466         riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1467         riscom_driver->init_termios = tty_std_termios;
1468         riscom_driver->init_termios.c_cflag =
1469                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1470         riscom_driver->init_termios.c_ispeed = 9600;
1471         riscom_driver->init_termios.c_ospeed = 9600;
1472         riscom_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_HARDWARE_BREAK;
1473         tty_set_operations(riscom_driver, &riscom_ops);
1474         error = tty_register_driver(riscom_driver);
1475         if (error != 0) {
1476                 put_tty_driver(riscom_driver);
1477                 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1478                                 "error = %d\n", error);
1479                 return 1;
1480         }
1481         memset(rc_port, 0, sizeof(rc_port));
1482         for (i = 0; i < RC_NPORT * RC_NBOARD; i++)  {
1483                 tty_port_init(&rc_port[i].port);
1484                 rc_port[i].port.ops = &riscom_port_ops;
1485                 rc_port[i].magic = RISCOM8_MAGIC;
1486         }
1487         return 0;
1488 }
1489
1490 static void rc_release_drivers(void)
1491 {
1492         tty_unregister_driver(riscom_driver);
1493         put_tty_driver(riscom_driver);
1494 }
1495
1496 #ifndef MODULE
1497 /*
1498  * Called at boot time.
1499  *
1500  * You can specify IO base for up to RC_NBOARD cards,
1501  * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1502  * Note that there will be no probing at default
1503  * addresses in this case.
1504  *
1505  */
1506 static int __init riscom8_setup(char *str)
1507 {
1508         int ints[RC_NBOARD];
1509         int i;
1510
1511         str = get_options(str, ARRAY_SIZE(ints), ints);
1512
1513         for (i = 0; i < RC_NBOARD; i++) {
1514                 if (i < ints[0])
1515                         rc_board[i].base = ints[i+1];
1516                 else
1517                         rc_board[i].base = 0;
1518         }
1519         return 1;
1520 }
1521
1522 __setup("riscom8=", riscom8_setup);
1523 #endif
1524
1525 static char banner[] __initdata =
1526         KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1527                   "1994-1996.\n";
1528 static char no_boards_msg[] __initdata =
1529         KERN_INFO "rc: No RISCom/8 boards detected.\n";
1530
1531 /*
1532  * This routine must be called by kernel at boot time
1533  */
1534 static int __init riscom8_init(void)
1535 {
1536         int i;
1537         int found = 0;
1538
1539         printk(banner);
1540
1541         if (rc_init_drivers())
1542                 return -EIO;
1543
1544         for (i = 0; i < RC_NBOARD; i++)
1545                 if (rc_board[i].base && !rc_probe(&rc_board[i]))
1546                         found++;
1547         if (!found)  {
1548                 rc_release_drivers();
1549                 printk(no_boards_msg);
1550                 return -EIO;
1551         }
1552         return 0;
1553 }
1554
1555 #ifdef MODULE
1556 static int iobase;
1557 static int iobase1;
1558 static int iobase2;
1559 static int iobase3;
1560 module_param(iobase, int, 0);
1561 module_param(iobase1, int, 0);
1562 module_param(iobase2, int, 0);
1563 module_param(iobase3, int, 0);
1564
1565 MODULE_LICENSE("GPL");
1566 #endif /* MODULE */
1567
1568 /*
1569  * You can setup up to 4 boards (current value of RC_NBOARD)
1570  * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1571  *
1572  */
1573 static int __init riscom8_init_module(void)
1574 {
1575 #ifdef MODULE
1576         int i;
1577
1578         if (iobase || iobase1 || iobase2 || iobase3) {
1579                 for (i = 0; i < RC_NBOARD; i++)
1580                         rc_board[i].base = 0;
1581         }
1582
1583         if (iobase)
1584                 rc_board[0].base = iobase;
1585         if (iobase1)
1586                 rc_board[1].base = iobase1;
1587         if (iobase2)
1588                 rc_board[2].base = iobase2;
1589         if (iobase3)
1590                 rc_board[3].base = iobase3;
1591 #endif /* MODULE */
1592
1593         return riscom8_init();
1594 }
1595
1596 static void __exit riscom8_exit_module(void)
1597 {
1598         int i;
1599
1600         rc_release_drivers();
1601         for (i = 0; i < RC_NBOARD; i++)
1602                 if (rc_board[i].flags & RC_BOARD_PRESENT)
1603                         rc_release_io_range(&rc_board[i]);
1604
1605 }
1606
1607 module_init(riscom8_init_module);
1608 module_exit(riscom8_exit_module);