drivers/char/ser_a2232.c

   1 /* drivers/char/ser_a2232.c */
   2
   3 /* $Id: ser_a2232.c,v 0.4 2000/01/25 12:00:00 ehaase Exp $ */
   4
   5 /* Linux serial driver for the Amiga A2232 board */
   6
   7 /* This driver is MAINTAINED. Before applying any changes, please contact
   8  * the author.
   9  */
  10
  11 /* Copyright (c) 2000-2001 Enver Haase    <ehaase@inf.fu-berlin.de>
  12  *                   alias The A2232 driver project <A2232@gmx.net>
  13  * All rights reserved.
  14  *
  15  *   This program is free software; you can redistribute it and/or modify
  16  *   it under the terms of the GNU General Public License as published by
  17  *   the Free Software Foundation; either version 2 of the License, or
  18  *   (at your option) any later version.
  19  *
  20  *   This program is distributed in the hope that it will be useful,
  21  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *   GNU General Public License for more details.
  24  *
  25  *   You should have received a copy of the GNU General Public License
  26  *   along with this program; if not, write to the Free Software
  27  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  *
  29  */
  30 /***************************** Documentation ************************/
  31 /*
  32  * This driver is in EXPERIMENTAL state. That means I could not find
  33  * someone with five A2232 boards with 35 ports running at 19200 bps
  34  * at the same time and test the machine's behaviour.
  35  * However, I know that you can performance-tweak this driver (see
  36  * the source code).
  37  * One thing to consider is the time this driver consumes during the
  38  * Amiga's vertical blank interrupt. Everything that is to be done
  39  * _IS DONE_ when entering the vertical blank interrupt handler of
  40  * this driver.
  41  * However, it would be more sane to only do the job for only ONE card
  42  * instead of ALL cards at a time; or, more generally, to handle only
  43  * SOME ports instead of ALL ports at a time.
  44  * However, as long as no-one runs into problems I guess I shouldn't
  45  * change the driver as it runs fine for me :) .
  46  *
  47  * Version history of this file:
  48  * 0.4  Resolved licensing issues.
  49  * 0.3  Inclusion in the Linux/m68k tree, small fixes.
  50  * 0.2  Added documentation, minor typo fixes.
  51  * 0.1  Initial release.
  52  *
  53  * TO DO:
  54  * -    Handle incoming BREAK events. I guess "Stevens: Advanced
  55  *      Programming in the UNIX(R) Environment" is a good reference
  56  *      on what is to be done.
  57  * -    When installing as a module, don't simply 'printk' text, but
  58  *      send it to the TTY used by the user.
  59  *
  60  * THANKS TO:
  61  * -    Jukka Marin (65EC02 code).
  62  * -    The other NetBSD developers on whose A2232 driver I had a
  63  *      pretty close look. However, I didn't copy any code so it
  64  *      is okay to put my code under the GPL and include it into
  65  *      Linux.
  66  */
  67 /***************************** End of Documentation *****************/
  68
  69 /***************************** Defines ******************************/
  70 /*
  71  * Enables experimental 115200 (normal) 230400 (turbo) baud rate.
  72  * The A2232 specification states it can only operate at speeds up to
  73  * 19200 bits per second, and I was not able to send a file via
  74  * "sz"/"rz" and a null-modem cable from one A2232 port to another
  75  * at 115200 bits per second.
  76  * However, this might work for you.
  77  */
  78 #undef A2232_SPEEDHACK
  79 /*
  80  * Default is not to use RTS/CTS so you could be talked to death.
  81  */
  82 #define A2232_SUPPRESS_RTSCTS_WARNING
  83 /************************* End of Defines ***************************/
  84
  85 /***************************** Includes *****************************/
  86 #include <linux/module.h>
  87
  88 #include <linux/types.h>
  89 #include <linux/sched.h>
  90 #include <linux/interrupt.h>
  91 #include <linux/kernel.h>
  92 #include <linux/errno.h>
  93 #include <linux/tty.h>
  94
  95 #include <asm/setup.h>
  96 #include <asm/amigaints.h>
  97 #include <asm/amigahw.h>
  98 #include <linux/zorro.h>
  99 #include <asm/irq.h>
 100 #include <asm/semaphore.h>
 101
 102 #include <linux/delay.h>
 103
 104 #include <linux/serial.h>
 105 #include <linux/generic_serial.h>
 106
 107 #include "ser_a2232.h"
 108 #include "ser_a2232fw.h"
 109 /************************* End of Includes **************************/
 110
 111 /***************************** Prototypes ***************************/
 112 /* The interrupt service routine */
 113 static irqreturn_t a2232_vbl_inter(int irq, void *data, struct pt_regs *fp);
 114 /* Initialize the port structures */
 115 static void a2232_init_portstructs(void);
 116 /* Initialize and register TTY drivers. */
 117 /* returns 0 IFF successful */
 118 static int a2232_init_drivers(void);
 119
 120 /* BEGIN GENERIC_SERIAL PROTOTYPES */
 121 static void a2232_disable_tx_interrupts(void *ptr);
 122 static void a2232_enable_tx_interrupts(void *ptr);
 123 static void a2232_disable_rx_interrupts(void *ptr);
 124 static void a2232_enable_rx_interrupts(void *ptr);
 125 static int  a2232_get_CD(void *ptr);
 126 static void a2232_shutdown_port(void *ptr);
 127 static int  a2232_set_real_termios(void *ptr);
 128 static int  a2232_chars_in_buffer(void *ptr);
 129 static void a2232_close(void *ptr);
 130 static void a2232_hungup(void *ptr);
 131 /* static void a2232_getserial (void *ptr, struct serial_struct *sp); */
 132 /* END GENERIC_SERIAL PROTOTYPES */
 133
 134 /* Functions that the TTY driver struct expects */
 135 static int  a2232_ioctl(struct tty_struct *tty, struct file *file,
 136                                                                                 unsigned int cmd, unsigned long arg);
 137 static void a2232_throttle(struct tty_struct *tty);
 138 static void a2232_unthrottle(struct tty_struct *tty);
 139 static int  a2232_open(struct tty_struct * tty, struct file * filp);
 140 /************************* End of Prototypes ************************/
 141
 142 /***************************** Global variables *********************/
 143 /*---------------------------------------------------------------------------
 144  * Interface from generic_serial.c back here
 145  *--------------------------------------------------------------------------*/
 146 static struct real_driver a2232_real_driver = {
 147         a2232_disable_tx_interrupts,
 148         a2232_enable_tx_interrupts,
 149         a2232_disable_rx_interrupts,
 150         a2232_enable_rx_interrupts,
 151         a2232_get_CD,
 152         a2232_shutdown_port,
 153         a2232_set_real_termios,
 154         a2232_chars_in_buffer,
 155         a2232_close,
 156         a2232_hungup,
 157         NULL    /* a2232_getserial */
 158 };
 159
 160 static void *a2232_driver_ID = &a2232_driver_ID; // Some memory address WE own.
 161
 162 /* Ports structs */
 163 static struct a2232_port a2232_ports[MAX_A2232_BOARDS*NUMLINES];
 164
 165 /* TTY driver structs */
 166 static struct tty_driver *a2232_driver;
 167
 168 /* nr of cards completely (all ports) and correctly configured */
 169 static int nr_a2232;
 170
 171 /* zorro_dev structs for the A2232's */
 172 static struct zorro_dev *zd_a2232[MAX_A2232_BOARDS];
 173 /***************************** End of Global variables **************/
 174
 175 /* Helper functions */
 176
 177 static inline volatile struct a2232memory *a2232mem(unsigned int board)
 178 {
 179         return (volatile struct a2232memory *)ZTWO_VADDR(zd_a2232[board]->resource.start);
 180 }
 181
 182 static inline volatile struct a2232status *a2232stat(unsigned int board,
 183                                                      unsigned int portonboard)
 184 {
 185         volatile struct a2232memory *mem = a2232mem(board);
 186         return &(mem->Status[portonboard]);
 187 }
 188
 189 static inline void a2232_receive_char(struct a2232_port *port, int ch, int err)
 190 {
 191 /*      Mostly stolen from other drivers.
 192         Maybe one could implement a more efficient version by not only
 193         transferring one character at a time.
 194 */
 195         struct tty_struct *tty = port->gs.tty;
 196
 197         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 198                 return;
 199
 200         tty->flip.count++;
 201
 202 #if 0
 203         switch(err) {
 204         case TTY_BREAK:
 205                 break;
 206         case TTY_PARITY:
 207                 break;
 208         case TTY_OVERRUN:
 209                 break;
 210         case TTY_FRAME:
 211                 break;
 212         }
 213 #endif
 214
 215         *tty->flip.flag_buf_ptr++ = err;
 216         *tty->flip.char_buf_ptr++ = ch;
 217         tty_flip_buffer_push(tty);
 218 }
 219
 220 /***************************** Functions ****************************/
 221 /*** BEGIN OF REAL_DRIVER FUNCTIONS ***/
 222
 223 static void a2232_disable_tx_interrupts(void *ptr)
 224 {
 225         struct a2232_port *port;
 226         volatile struct a2232status *stat;
 227         unsigned long flags;
 228
 229         port = ptr;
 230         stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
 231         stat->OutDisable = -1;
 232
 233         /* Does this here really have to be? */
 234         local_irq_save(flags);
 235         port->gs.flags &= ~GS_TX_INTEN;
 236         local_irq_restore(flags);
 237 }
 238
 239 static void a2232_enable_tx_interrupts(void *ptr)
 240 {
 241         struct a2232_port *port;
 242         volatile struct a2232status *stat;
 243         unsigned long flags;
 244
 245         port = ptr;
 246         stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
 247         stat->OutDisable = 0;
 248
 249         /* Does this here really have to be? */
 250         local_irq_save(flags);
 251         port->gs.flags |= GS_TX_INTEN;
 252         local_irq_restore(flags);
 253 }
 254
 255 static void a2232_disable_rx_interrupts(void *ptr)
 256 {
 257         struct a2232_port *port;
 258         port = ptr;
 259         port->disable_rx = -1;
 260 }
 261
 262 static void a2232_enable_rx_interrupts(void *ptr)
 263 {
 264         struct a2232_port *port;
 265         port = ptr;
 266         port->disable_rx = 0;
 267 }
 268
 269 static int  a2232_get_CD(void *ptr)
 270 {
 271         return ((struct a2232_port *) ptr)->cd_status;
 272 }
 273
 274 static void a2232_shutdown_port(void *ptr)
 275 {
 276         struct a2232_port *port;
 277         volatile struct a2232status *stat;
 278         unsigned long flags;
 279
 280         port = ptr;
 281         stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
 282
 283         local_irq_save(flags);
 284
 285         port->gs.flags &= ~GS_ACTIVE;
 286
 287         if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
 288                 /* Set DTR and RTS to Low, flush output.
 289                    The NetBSD driver "msc.c" does it this way. */
 290                 stat->Command = (       (stat->Command & ~A2232CMD_CMask) |
 291                                         A2232CMD_Close );
 292                 stat->OutFlush = -1;
 293                 stat->Setup = -1;
 294         }
 295
 296         local_irq_restore(flags);
 297
 298         /* After analyzing control flow, I think a2232_shutdown_port
 299                 is actually the last call from the system when at application
 300                 level someone issues a "echo Hello >>/dev/ttyY0".
 301                 Therefore I think the MOD_DEC_USE_COUNT should be here and
 302                 not in "a2232_close()". See the comment in "sx.c", too.
 303                 If you run into problems, compile this driver into the
 304                 kernel instead of compiling it as a module. */
 305 }
 306
 307 static int  a2232_set_real_termios(void *ptr)
 308 {
 309         unsigned int cflag, baud, chsize, stopb, parity, softflow;
 310         int rate;
 311         int a2232_param, a2232_cmd;
 312         unsigned long flags;
 313         unsigned int i;
 314         struct a2232_port *port = ptr;
 315         volatile struct a2232status *status;
 316         volatile struct a2232memory *mem;
 317
 318         if (!port->gs.tty || !port->gs.tty->termios) return 0;
 319
 320         status = a2232stat(port->which_a2232, port->which_port_on_a2232);
 321         mem = a2232mem(port->which_a2232);
 322
 323         a2232_param = a2232_cmd = 0;
 324
 325         // get baud rate
 326         baud = port->gs.baud;
 327         if (baud == 0) {
 328                 /* speed == 0 -> drop DTR, do nothing else */
 329                 local_irq_save(flags);
 330                 // Clear DTR (and RTS... mhhh).
 331                 status->Command = (     (status->Command & ~A2232CMD_CMask) |
 332                                         A2232CMD_Close );
 333                 status->OutFlush = -1;
 334                 status->Setup = -1;
 335
 336                 local_irq_restore(flags);
 337                 return 0;
 338         }
 339
 340         rate = A2232_BAUD_TABLE_NOAVAIL;
 341         for (i=0; i < A2232_BAUD_TABLE_NUM_RATES * 3; i += 3){
 342                 if (a2232_baud_table[i] == baud){
 343                         if (mem->Common.Crystal == A2232_TURBO) rate = a2232_baud_table[i+2];
 344                         else                                    rate = a2232_baud_table[i+1];
 345                 }
 346         }
 347         if (rate == A2232_BAUD_TABLE_NOAVAIL){
 348                 printk("a2232: Board %d Port %d unsupported baud rate: %d baud. Using another.\n",port->which_a2232,port->which_port_on_a2232,baud);
 349                 // This is useful for both (turbo or normal) Crystal versions.
 350                 rate = A2232PARAM_B9600;
 351         }
 352         a2232_param |= rate;
 353
 354         cflag  = port->gs.tty->termios->c_cflag;
 355
 356         // get character size
 357         chsize = cflag & CSIZE;
 358         switch (chsize){
 359                 case CS8:       a2232_param |= A2232PARAM_8Bit; break;
 360                 case CS7:       a2232_param |= A2232PARAM_7Bit; break;
 361                 case CS6:       a2232_param |= A2232PARAM_6Bit; break;
 362                 case CS5:       a2232_param |= A2232PARAM_5Bit; break;
 363                 default:        printk("a2232: Board %d Port %d unsupported character size: %d. Using 8 data bits.\n",
 364                                         port->which_a2232,port->which_port_on_a2232,chsize);
 365                                 a2232_param |= A2232PARAM_8Bit; break;
 366         }
 367
 368         // get number of stop bits
 369         stopb  = cflag & CSTOPB;
 370         if (stopb){ // two stop bits instead of one
 371                 printk("a2232: Board %d Port %d 2 stop bits unsupported. Using 1 stop bit.\n",
 372                         port->which_a2232,port->which_port_on_a2232);
 373         }
 374
 375         // Warn if RTS/CTS not wanted
 376         if (!(cflag & CRTSCTS)){
 377 #ifndef A2232_SUPPRESS_RTSCTS_WARNING
 378                 printk("a2232: Board %d Port %d cannot switch off firmware-implemented RTS/CTS hardware flow control.\n",
 379                         port->which_a2232,port->which_port_on_a2232);
 380 #endif
 381         }
 382
 383         /*      I think this is correct.
 384                 However, IXOFF means _input_ flow control and I wonder
 385                 if one should care about IXON _output_ flow control,
 386                 too. If this makes problems, one should turn the A2232
 387                 firmware XON/XOFF "SoftFlow" flow control off and use
 388                 the conventional way of inserting START/STOP characters
 389                 by hand in throttle()/unthrottle().
 390         */
 391         softflow = !!( port->gs.tty->termios->c_iflag & IXOFF );
 392
 393         // get Parity (Enabled/Disabled? If Enabled, Odd or Even?)
 394         parity = cflag & (PARENB | PARODD);
 395         if (parity & PARENB){
 396                 if (parity & PARODD){
 397                         a2232_cmd |= A2232CMD_OddParity;
 398                 }
 399                 else{
 400                         a2232_cmd |= A2232CMD_EvenParity;
 401                 }
 402         }
 403         else a2232_cmd |= A2232CMD_NoParity;
 404
 405
 406         /*      Hmm. Maybe an own a2232_port structure
 407                 member would be cleaner?        */
 408         if (cflag & CLOCAL)
 409                 port->gs.flags &= ~ASYNC_CHECK_CD;
 410         else
 411                 port->gs.flags |= ASYNC_CHECK_CD;
 412
 413
 414         /* Now we have all parameters and can go to set them: */
 415         local_irq_save(flags);
 416
 417         status->Param = a2232_param | A2232PARAM_RcvBaud;
 418         status->Command = a2232_cmd | A2232CMD_Open |  A2232CMD_Enable;
 419         status->SoftFlow = softflow;
 420         status->OutDisable = 0;
 421         status->Setup = -1;
 422
 423         local_irq_restore(flags);
 424         return 0;
 425 }
 426
 427 static int  a2232_chars_in_buffer(void *ptr)
 428 {
 429         struct a2232_port *port;
 430         volatile struct a2232status *status;
 431         unsigned char ret; /* we need modulo-256 arithmetics */
 432         port = ptr;
 433         status = a2232stat(port->which_a2232, port->which_port_on_a2232);
 434 #if A2232_IOBUFLEN != 256
 435 #error "Re-Implement a2232_chars_in_buffer()!"
 436 #endif
 437         ret = (status->OutHead - status->OutTail);
 438         return ret;
 439 }
 440
 441 static void a2232_close(void *ptr)
 442 {
 443         a2232_disable_tx_interrupts(ptr);
 444         a2232_disable_rx_interrupts(ptr);
 445         /* see the comment in a2232_shutdown_port above. */
 446 }
 447
 448 static void a2232_hungup(void *ptr)
 449 {
 450         a2232_close(ptr);
 451 }
 452 /*** END   OF REAL_DRIVER FUNCTIONS ***/
 453
 454 /*** BEGIN  FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
 455 static int a2232_ioctl( struct tty_struct *tty, struct file *file,
 456                         unsigned int cmd, unsigned long arg)
 457 {
 458         return -ENOIOCTLCMD;
 459 }
 460
 461 static void a2232_throttle(struct tty_struct *tty)
 462 {
 463 /* Throttle: System cannot take another chars: Drop RTS or
 464              send the STOP char or whatever.
 465    The A2232 firmware does RTS/CTS anyway, and XON/XOFF
 466    if switched on. So the only thing we can do at this
 467    layer here is not taking any characters out of the
 468    A2232 buffer any more. */
 469         struct a2232_port *port = (struct a2232_port *) tty->driver_data;
 470         port->throttle_input = -1;
 471 }
 472
 473 static void a2232_unthrottle(struct tty_struct *tty)
 474 {
 475 /* Unthrottle: dual to "throttle()" above. */
 476         struct a2232_port *port = (struct a2232_port *) tty->driver_data;
 477         port->throttle_input = 0;
 478 }
 479
 480 static int  a2232_open(struct tty_struct * tty, struct file * filp)
 481 {
 482 /* More or less stolen from other drivers. */
 483         int line;
 484         int retval;
 485         struct a2232_port *port;
 486
 487         line = tty->index;
 488         port = &a2232_ports[line];
 489
 490         tty->driver_data = port;
 491         port->gs.tty = tty;
 492         port->gs.count++;
 493         retval = gs_init_port(&port->gs);
 494         if (retval) {
 495                 port->gs.count--;
 496                 return retval;
 497         }
 498         port->gs.flags |= GS_ACTIVE;
 499         retval = gs_block_til_ready(port, filp);
 500
 501         if (retval) {
 502                 port->gs.count--;
 503                 return retval;
 504         }
 505
 506         a2232_enable_rx_interrupts(port);
 507
 508         return 0;
 509 }
 510 /*** END OF FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
 511
 512 static irqreturn_t a2232_vbl_inter(int irq, void *data, struct pt_regs *fp)
 513 {
 514 #if A2232_IOBUFLEN != 256
 515 #error "Re-Implement a2232_vbl_inter()!"
 516 #endif
 517
 518 struct a2232_port *port;
 519 volatile struct a2232memory *mem;
 520 volatile struct a2232status *status;
 521 unsigned char newhead;
 522 unsigned char bufpos; /* Must be unsigned char. We need the modulo-256 arithmetics */
 523 unsigned char ncd, ocd, ccd; /* names consistent with the NetBSD driver */
 524 volatile u_char *ibuf, *cbuf, *obuf;
 525 int ch, err, n, p;
 526         for (n = 0; n < nr_a2232; n++){         /* for every completely initialized A2232 board */
 527                 mem = a2232mem(n);
 528                 for (p = 0; p < NUMLINES; p++){ /* for every port on this board */
 529                         err = 0;
 530                         port = &a2232_ports[n*NUMLINES+p];
 531                         if ( port->gs.flags & GS_ACTIVE ){ /* if the port is used */
 532
 533                                 status = a2232stat(n,p);
 534
 535                                 if (!port->disable_rx && !port->throttle_input){ /* If input is not disabled */
 536                                         newhead = status->InHead;               /* 65EC02 write pointer */
 537                                         bufpos = status->InTail;
 538
 539                                         /* check for input for this port */
 540                                         if (newhead != bufpos) {
 541                                                 /* buffer for input chars/events */
 542                                                 ibuf = mem->InBuf[p];
 543
 544                                                 /* data types of bytes in ibuf */
 545                                                 cbuf = mem->InCtl[p];
 546
 547                                                 /* do for all chars */
 548                                                 while (bufpos != newhead) {
 549                                                         /* which type of input data? */
 550                                                         switch (cbuf[bufpos]) {
 551                                                                 /* switch on input event (CD, BREAK, etc.) */
 552                                                         case A2232INCTL_EVENT:
 553                                                                 switch (ibuf[bufpos++]) {
 554                                                                 case A2232EVENT_Break:
 555                                                                         /* TODO: Handle BREAK signal */
 556                                                                         break;
 557                                                                         /*      A2232EVENT_CarrierOn and A2232EVENT_CarrierOff are
 558                                                                                 handled in a separate queue and should not occur here. */
 559                                                                 case A2232EVENT_Sync:
 560                                                                         printk("A2232: 65EC02 software sent SYNC event, don't know what to do. Ignoring.");
 561                                                                         break;
 562                                                                 default:
 563                                                                         printk("A2232: 65EC02 software broken, unknown event type %d occurred.\n",ibuf[bufpos-1]);
 564                                                                 } /* event type switch */
 565                                                                 break;
 566                                                         case A2232INCTL_CHAR:
 567                                                                 /* Receive incoming char */
 568                                                                 a2232_receive_char(port, ibuf[bufpos], err);
 569                                                                 bufpos++;
 570                                                                 break;
 571                                                         default:
 572                                                                 printk("A2232: 65EC02 software broken, unknown data type %d occurred.\n",cbuf[bufpos]);
 573                                                                 bufpos++;
 574                                                         } /* switch on input data type */
 575                                                 } /* while there's something in the buffer */
 576
 577                                                 status->InTail = bufpos;            /* tell 65EC02 what we've read */
 578
 579                                         } /* if there was something in the buffer */
 580                                 } /* If input is not disabled */
 581
 582                                 /* Now check if there's something to output */
 583                                 obuf = mem->OutBuf[p];
 584                                 bufpos = status->OutHead;
 585                                 while ( (port->gs.xmit_cnt > 0)         &&
 586                                         (!port->gs.tty->stopped)        &&
 587                                         (!port->gs.tty->hw_stopped) ){  /* While there are chars to transmit */
 588                                         if (((bufpos+1) & A2232_IOBUFLENMASK) != status->OutTail) { /* If the A2232 buffer is not full */
 589                                                 ch = port->gs.xmit_buf[port->gs.xmit_tail];                                     /* get the next char to transmit */
 590                                                 port->gs.xmit_tail = (port->gs.xmit_tail+1) & (SERIAL_XMIT_SIZE-1); /* modulo-addition for the gs.xmit_buf ring-buffer */
 591                                                 obuf[bufpos++] = ch;                                                                                                                            /* put it into the A2232 buffer */
 592                                                 port->gs.xmit_cnt--;
 593                                         }
 594                                         else{                                                                                                                                                                                                   /* If A2232 the buffer is full */
 595                                                 break;                                                                                                                                                                                  /* simply stop filling it. */
 596                                         }
 597                                 }
 598                                 status->OutHead = bufpos;
 599
 600                                 /* WakeUp if output buffer runs low */
 601                                 if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.tty) {
 602                                         tty_wakeup(port->gs.tty);
 603                                 }
 604                         } // if the port is used
 605                 } // for every port on the board
 606
 607                 /* Now check the CD message queue */
 608                 newhead = mem->Common.CDHead;
 609                 bufpos = mem->Common.CDTail;
 610                 if (newhead != bufpos){                         /* There are CD events in queue */
 611                         ocd = mem->Common.CDStatus;             /* get old status bits */
 612                         while (newhead != bufpos){              /* read all events */
 613                                 ncd = mem->CDBuf[bufpos++];     /* get one event */
 614                                 ccd = ncd ^ ocd;                /* mask of changed lines */
 615                                 ocd = ncd;                      /* save new status bits */
 616                                 for(p=0; p < NUMLINES; p++){    /* for all ports */
 617                                         if (ccd & 1){           /* this one changed */
 618
 619                                                 struct a2232_port *port = &a2232_ports[n*7+p];
 620                                                 port->cd_status = !(ncd & 1); /* ncd&1 <=> CD is now off */
 621
 622                                                 if (!(port->gs.flags & ASYNC_CHECK_CD))
 623                                                         ;       /* Don't report DCD changes */
 624                                                 else if (port->cd_status) { // if DCD on: DCD went UP!
 625
 626                                                         /* Are we blocking in open?*/
 627                                                         wake_up_interruptible(&port->gs.open_wait);
 628                                                 }
 629                                                 else { // if DCD off: DCD went DOWN!
 630                                                         if (port->gs.tty)
 631                                                                 tty_hangup (port->gs.tty);
 632                                                 }
 633
 634                                         } // if CD changed for this port
 635                                         ccd >>= 1;
 636                                         ncd >>= 1;                                                                      /* Shift bits for next line */
 637                                 } // for every port
 638                         } // while CD events in queue
 639                         mem->Common.CDStatus = ocd; /* save new status */
 640                         mem->Common.CDTail = bufpos; /* remove events */
 641                 } // if events in CD queue
 642
 643         } // for every completely initialized A2232 board
 644         return IRQ_HANDLED;
 645 }
 646
 647 static void a2232_init_portstructs(void)
 648 {
 649         struct a2232_port *port;
 650         int i;
 651
 652         for (i = 0; i < MAX_A2232_BOARDS*NUMLINES; i++) {
 653                 port = a2232_ports + i;
 654                 port->which_a2232 = i/NUMLINES;
 655                 port->which_port_on_a2232 = i%NUMLINES;
 656                 port->disable_rx = port->throttle_input = port->cd_status = 0;
 657                 port->gs.magic = A2232_MAGIC;
 658                 port->gs.close_delay = HZ/2;
 659                 port->gs.closing_wait = 30 * HZ;
 660                 port->gs.rd = &a2232_real_driver;
 661 #ifdef NEW_WRITE_LOCKING
 662                 init_MUTEX(&(port->gs.port_write_sem));
 663 #endif
 664                 init_waitqueue_head(&port->gs.open_wait);
 665                 init_waitqueue_head(&port->gs.close_wait);
 666         }
 667 }
 668
 669 static struct tty_operations a2232_ops = {
 670         .open = a2232_open,
 671         .close = gs_close,
 672         .write = gs_write,
 673         .put_char = gs_put_char,
 674         .flush_chars = gs_flush_chars,
 675         .write_room = gs_write_room,
 676         .chars_in_buffer = gs_chars_in_buffer,
 677         .flush_buffer = gs_flush_buffer,
 678         .ioctl = a2232_ioctl,
 679         .throttle = a2232_throttle,
 680         .unthrottle = a2232_unthrottle,
 681         .set_termios = gs_set_termios,
 682         .stop = gs_stop,
 683         .start = gs_start,
 684         .hangup = gs_hangup,
 685 };
 686
 687 static int a2232_init_drivers(void)
 688 {
 689         int error;
 690
 691         a2232_driver = alloc_tty_driver(NUMLINES * nr_a2232);
 692         if (!a2232_driver)
 693                 return -ENOMEM;
 694         a2232_driver->owner = THIS_MODULE;
 695         a2232_driver->driver_name = "commodore_a2232";
 696         a2232_driver->name = "ttyY";
 697         a2232_driver->major = A2232_NORMAL_MAJOR;
 698         a2232_driver->type = TTY_DRIVER_TYPE_SERIAL;
 699         a2232_driver->subtype = SERIAL_TYPE_NORMAL;
 700         a2232_driver->init_termios = tty_std_termios;
 701         a2232_driver->init_termios.c_cflag =
 702                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 703         a2232_driver->flags = TTY_DRIVER_REAL_RAW;
 704         tty_set_operations(a2232_driver, &a2232_ops);
 705         if ((error = tty_register_driver(a2232_driver))) {
 706                 printk(KERN_ERR "A2232: Couldn't register A2232 driver, error = %d\n",
 707                        error);
 708                 put_tty_driver(a2232_driver);
 709                 return 1;
 710         }
 711         return 0;
 712 }
 713
 714 static int __init a2232board_init(void)
 715 {
 716         struct zorro_dev *z;
 717
 718         unsigned int boardaddr;
 719         int bcount;
 720         short start;
 721         u_char *from;
 722         volatile u_char *to;
 723         volatile struct a2232memory *mem;
 724
 725 #ifdef CONFIG_SMP
 726         return -ENODEV; /* This driver is not SMP aware. Is there an SMP ZorroII-bus-machine? */
 727 #endif
 728
 729         if (!MACH_IS_AMIGA){
 730                 return -ENODEV;
 731         }
 732
 733         printk("Commodore A2232 driver initializing.\n"); /* Say that we're alive. */
 734
 735         z = NULL;
 736         nr_a2232 = 0;
 737         while ( (z = zorro_find_device(ZORRO_WILDCARD, z)) ){
 738                 if (    (z->id != ZORRO_PROD_CBM_A2232_PROTOTYPE) &&
 739                         (z->id != ZORRO_PROD_CBM_A2232) ){
 740                         continue;       // The board found was no A2232
 741                 }
 742                 if (!zorro_request_device(z,"A2232 driver"))
 743                         continue;
 744
 745                 printk("Commodore A2232 found (#%d).\n",nr_a2232);
 746
 747                 zd_a2232[nr_a2232] = z;
 748
 749                 boardaddr = ZTWO_VADDR( z->resource.start );
 750                 printk("Board is located at address 0x%x, size is 0x%x.\n", boardaddr, (unsigned int) ((z->resource.end+1) - (z->resource.start)));
 751
 752                 mem = (volatile struct a2232memory *) boardaddr;
 753
 754                 (void) mem->Enable6502Reset;   /* copy the code across to the board */
 755                 to = (u_char *)mem;  from = a2232_65EC02code; bcount = sizeof(a2232_65EC02code) - 2;
 756                 start = *(short *)from;
 757                 from += sizeof(start);
 758                 to += start;
 759                 while(bcount--) *to++ = *from++;
 760                 printk("65EC02 software uploaded to the A2232 memory.\n");
 761
 762                 mem->Common.Crystal = A2232_UNKNOWN;  /* use automatic speed check */
 763
 764                 /* start 6502 running */
 765                 (void) mem->ResetBoard;
 766                 printk("A2232's 65EC02 CPU up and running.\n");
 767
 768                 /* wait until speed detector has finished */
 769                 for (bcount = 0; bcount < 2000; bcount++) {
 770                         udelay(1000);
 771                         if (mem->Common.Crystal)
 772                                 break;
 773                 }
 774                 printk((mem->Common.Crystal?"A2232 oscillator crystal detected by 65EC02 software: ":"65EC02 software could not determine A2232 oscillator crystal: "));
 775                 switch (mem->Common.Crystal){
 776                 case A2232_UNKNOWN:
 777                         printk("Unknown crystal.\n");
 778                         break;
 779                 case A2232_NORMAL:
 780                         printk ("Normal crystal.\n");
 781                         break;
 782                 case A2232_TURBO:
 783                         printk ("Turbo crystal.\n");
 784                         break;
 785                 default:
 786                         printk ("0x%x. Huh?\n",mem->Common.Crystal);
 787                 }
 788
 789                 nr_a2232++;
 790
 791         }
 792
 793         printk("Total: %d A2232 boards initialized.\n", nr_a2232); /* Some status report if no card was found */
 794
 795         a2232_init_portstructs();
 796
 797         /*
 798                 a2232_init_drivers also registers the drivers. Must be here because all boards
 799                 have to be detected first.
 800         */
 801         if (a2232_init_drivers()) return -ENODEV; // maybe we should use a different -Exxx?
 802
 803         request_irq(IRQ_AMIGA_VERTB, a2232_vbl_inter, 0, "A2232 serial VBL", a2232_driver_ID);
 804         return 0;
 805 }
 806
 807 static void __exit a2232board_exit(void)
 808 {
 809         int i;
 810
 811         for (i = 0; i < nr_a2232; i++) {
 812                 zorro_release_device(zd_a2232[i]);
 813         }
 814
 815         tty_unregister_driver(a2232_driver);
 816         put_tty_driver(a2232_driver);
 817         free_irq(IRQ_AMIGA_VERTB, a2232_driver_ID);
 818 }
 819
 820 module_init(a2232board_init);
 821 module_exit(a2232board_exit);
 822
 823 MODULE_AUTHOR("Enver Haase");
 824 MODULE_DESCRIPTION("Amiga A2232 multi-serial board driver");
 825 MODULE_LICENSE("GPL");