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