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[pv_ops_mirror.git] / drivers / char / ser_a2232.c
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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");
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