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[wrt350n-kernel.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/interrupt.h>
90 #include <linux/kernel.h>
91 #include <linux/errno.h>
92 #include <linux/tty.h>
93
94 #include <asm/setup.h>
95 #include <asm/amigaints.h>
96 #include <asm/amigahw.h>
97 #include <linux/zorro.h>
98 #include <asm/irq.h>
99 #include <linux/mutex.h>
100
101 #include <linux/delay.h>
102
103 #include <linux/serial.h>
104 #include <linux/generic_serial.h>
105 #include <linux/tty_flip.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);
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 0
198 switch(err) {
199 case TTY_BREAK:
200 break;
201 case TTY_PARITY:
202 break;
203 case TTY_OVERRUN:
204 break;
205 case TTY_FRAME:
206 break;
207 }
208 #endif
209
210 tty_insert_flip_char(tty, ch, err);
211 tty_flip_buffer_push(tty);
212 }
213
214 /***************************** Functions ****************************/
215 /*** BEGIN OF REAL_DRIVER FUNCTIONS ***/
216
217 static void a2232_disable_tx_interrupts(void *ptr)
218 {
219 struct a2232_port *port;
220 volatile struct a2232status *stat;
221 unsigned long flags;
222
223 port = ptr;
224 stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
225 stat->OutDisable = -1;
226
227 /* Does this here really have to be? */
228 local_irq_save(flags);
229 port->gs.flags &= ~GS_TX_INTEN;
230 local_irq_restore(flags);
231 }
232
233 static void a2232_enable_tx_interrupts(void *ptr)
234 {
235 struct a2232_port *port;
236 volatile struct a2232status *stat;
237 unsigned long flags;
238
239 port = ptr;
240 stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
241 stat->OutDisable = 0;
242
243 /* Does this here really have to be? */
244 local_irq_save(flags);
245 port->gs.flags |= GS_TX_INTEN;
246 local_irq_restore(flags);
247 }
248
249 static void a2232_disable_rx_interrupts(void *ptr)
250 {
251 struct a2232_port *port;
252 port = ptr;
253 port->disable_rx = -1;
254 }
255
256 static void a2232_enable_rx_interrupts(void *ptr)
257 {
258 struct a2232_port *port;
259 port = ptr;
260 port->disable_rx = 0;
261 }
262
263 static int a2232_get_CD(void *ptr)
264 {
265 return ((struct a2232_port *) ptr)->cd_status;
266 }
267
268 static void a2232_shutdown_port(void *ptr)
269 {
270 struct a2232_port *port;
271 volatile struct a2232status *stat;
272 unsigned long flags;
273
274 port = ptr;
275 stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
276
277 local_irq_save(flags);
278
279 port->gs.flags &= ~GS_ACTIVE;
280
281 if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
282 /* Set DTR and RTS to Low, flush output.
283 The NetBSD driver "msc.c" does it this way. */
284 stat->Command = ( (stat->Command & ~A2232CMD_CMask) |
285 A2232CMD_Close );
286 stat->OutFlush = -1;
287 stat->Setup = -1;
288 }
289
290 local_irq_restore(flags);
291
292 /* After analyzing control flow, I think a2232_shutdown_port
293 is actually the last call from the system when at application
294 level someone issues a "echo Hello >>/dev/ttyY0".
295 Therefore I think the MOD_DEC_USE_COUNT should be here and
296 not in "a2232_close()". See the comment in "sx.c", too.
297 If you run into problems, compile this driver into the
298 kernel instead of compiling it as a module. */
299 }
300
301 static int a2232_set_real_termios(void *ptr)
302 {
303 unsigned int cflag, baud, chsize, stopb, parity, softflow;
304 int rate;
305 int a2232_param, a2232_cmd;
306 unsigned long flags;
307 unsigned int i;
308 struct a2232_port *port = ptr;
309 volatile struct a2232status *status;
310 volatile struct a2232memory *mem;
311
312 if (!port->gs.tty || !port->gs.tty->termios) return 0;
313
314 status = a2232stat(port->which_a2232, port->which_port_on_a2232);
315 mem = a2232mem(port->which_a2232);
316
317 a2232_param = a2232_cmd = 0;
318
319 // get baud rate
320 baud = port->gs.baud;
321 if (baud == 0) {
322 /* speed == 0 -> drop DTR, do nothing else */
323 local_irq_save(flags);
324 // Clear DTR (and RTS... mhhh).
325 status->Command = ( (status->Command & ~A2232CMD_CMask) |
326 A2232CMD_Close );
327 status->OutFlush = -1;
328 status->Setup = -1;
329
330 local_irq_restore(flags);
331 return 0;
332 }
333
334 rate = A2232_BAUD_TABLE_NOAVAIL;
335 for (i=0; i < A2232_BAUD_TABLE_NUM_RATES * 3; i += 3){
336 if (a2232_baud_table[i] == baud){
337 if (mem->Common.Crystal == A2232_TURBO) rate = a2232_baud_table[i+2];
338 else rate = a2232_baud_table[i+1];
339 }
340 }
341 if (rate == A2232_BAUD_TABLE_NOAVAIL){
342 printk("a2232: Board %d Port %d unsupported baud rate: %d baud. Using another.\n",port->which_a2232,port->which_port_on_a2232,baud);
343 // This is useful for both (turbo or normal) Crystal versions.
344 rate = A2232PARAM_B9600;
345 }
346 a2232_param |= rate;
347
348 cflag = port->gs.tty->termios->c_cflag;
349
350 // get character size
351 chsize = cflag & CSIZE;
352 switch (chsize){
353 case CS8: a2232_param |= A2232PARAM_8Bit; break;
354 case CS7: a2232_param |= A2232PARAM_7Bit; break;
355 case CS6: a2232_param |= A2232PARAM_6Bit; break;
356 case CS5: a2232_param |= A2232PARAM_5Bit; break;
357 default: printk("a2232: Board %d Port %d unsupported character size: %d. Using 8 data bits.\n",
358 port->which_a2232,port->which_port_on_a2232,chsize);
359 a2232_param |= A2232PARAM_8Bit; break;
360 }
361
362 // get number of stop bits
363 stopb = cflag & CSTOPB;
364 if (stopb){ // two stop bits instead of one
365 printk("a2232: Board %d Port %d 2 stop bits unsupported. Using 1 stop bit.\n",
366 port->which_a2232,port->which_port_on_a2232);
367 }
368
369 // Warn if RTS/CTS not wanted
370 if (!(cflag & CRTSCTS)){
371 #ifndef A2232_SUPPRESS_RTSCTS_WARNING
372 printk("a2232: Board %d Port %d cannot switch off firmware-implemented RTS/CTS hardware flow control.\n",
373 port->which_a2232,port->which_port_on_a2232);
374 #endif
375 }
376
377 /* I think this is correct.
378 However, IXOFF means _input_ flow control and I wonder
379 if one should care about IXON _output_ flow control,
380 too. If this makes problems, one should turn the A2232
381 firmware XON/XOFF "SoftFlow" flow control off and use
382 the conventional way of inserting START/STOP characters
383 by hand in throttle()/unthrottle().
384 */
385 softflow = !!( port->gs.tty->termios->c_iflag & IXOFF );
386
387 // get Parity (Enabled/Disabled? If Enabled, Odd or Even?)
388 parity = cflag & (PARENB | PARODD);
389 if (parity & PARENB){
390 if (parity & PARODD){
391 a2232_cmd |= A2232CMD_OddParity;
392 }
393 else{
394 a2232_cmd |= A2232CMD_EvenParity;
395 }
396 }
397 else a2232_cmd |= A2232CMD_NoParity;
398
399
400 /* Hmm. Maybe an own a2232_port structure
401 member would be cleaner? */
402 if (cflag & CLOCAL)
403 port->gs.flags &= ~ASYNC_CHECK_CD;
404 else
405 port->gs.flags |= ASYNC_CHECK_CD;
406
407
408 /* Now we have all parameters and can go to set them: */
409 local_irq_save(flags);
410
411 status->Param = a2232_param | A2232PARAM_RcvBaud;
412 status->Command = a2232_cmd | A2232CMD_Open | A2232CMD_Enable;
413 status->SoftFlow = softflow;
414 status->OutDisable = 0;
415 status->Setup = -1;
416
417 local_irq_restore(flags);
418 return 0;
419 }
420
421 static int a2232_chars_in_buffer(void *ptr)
422 {
423 struct a2232_port *port;
424 volatile struct a2232status *status;
425 unsigned char ret; /* we need modulo-256 arithmetics */
426 port = ptr;
427 status = a2232stat(port->which_a2232, port->which_port_on_a2232);
428 #if A2232_IOBUFLEN != 256
429 #error "Re-Implement a2232_chars_in_buffer()!"
430 #endif
431 ret = (status->OutHead - status->OutTail);
432 return ret;
433 }
434
435 static void a2232_close(void *ptr)
436 {
437 a2232_disable_tx_interrupts(ptr);
438 a2232_disable_rx_interrupts(ptr);
439 /* see the comment in a2232_shutdown_port above. */
440 }
441
442 static void a2232_hungup(void *ptr)
443 {
444 a2232_close(ptr);
445 }
446 /*** END OF REAL_DRIVER FUNCTIONS ***/
447
448 /*** BEGIN FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
449 static int a2232_ioctl( struct tty_struct *tty, struct file *file,
450 unsigned int cmd, unsigned long arg)
451 {
452 return -ENOIOCTLCMD;
453 }
454
455 static void a2232_throttle(struct tty_struct *tty)
456 {
457 /* Throttle: System cannot take another chars: Drop RTS or
458 send the STOP char or whatever.
459 The A2232 firmware does RTS/CTS anyway, and XON/XOFF
460 if switched on. So the only thing we can do at this
461 layer here is not taking any characters out of the
462 A2232 buffer any more. */
463 struct a2232_port *port = (struct a2232_port *) tty->driver_data;
464 port->throttle_input = -1;
465 }
466
467 static void a2232_unthrottle(struct tty_struct *tty)
468 {
469 /* Unthrottle: dual to "throttle()" above. */
470 struct a2232_port *port = (struct a2232_port *) tty->driver_data;
471 port->throttle_input = 0;
472 }
473
474 static int a2232_open(struct tty_struct * tty, struct file * filp)
475 {
476 /* More or less stolen from other drivers. */
477 int line;
478 int retval;
479 struct a2232_port *port;
480
481 line = tty->index;
482 port = &a2232_ports[line];
483
484 tty->driver_data = port;
485 port->gs.tty = tty;
486 port->gs.count++;
487 retval = gs_init_port(&port->gs);
488 if (retval) {
489 port->gs.count--;
490 return retval;
491 }
492 port->gs.flags |= GS_ACTIVE;
493 retval = gs_block_til_ready(port, filp);
494
495 if (retval) {
496 port->gs.count--;
497 return retval;
498 }
499
500 a2232_enable_rx_interrupts(port);
501
502 return 0;
503 }
504 /*** END OF FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
505
506 static irqreturn_t a2232_vbl_inter(int irq, void *data)
507 {
508 #if A2232_IOBUFLEN != 256
509 #error "Re-Implement a2232_vbl_inter()!"
510 #endif
511
512 struct a2232_port *port;
513 volatile struct a2232memory *mem;
514 volatile struct a2232status *status;
515 unsigned char newhead;
516 unsigned char bufpos; /* Must be unsigned char. We need the modulo-256 arithmetics */
517 unsigned char ncd, ocd, ccd; /* names consistent with the NetBSD driver */
518 volatile u_char *ibuf, *cbuf, *obuf;
519 int ch, err, n, p;
520 for (n = 0; n < nr_a2232; n++){ /* for every completely initialized A2232 board */
521 mem = a2232mem(n);
522 for (p = 0; p < NUMLINES; p++){ /* for every port on this board */
523 err = 0;
524 port = &a2232_ports[n*NUMLINES+p];
525 if ( port->gs.flags & GS_ACTIVE ){ /* if the port is used */
526
527 status = a2232stat(n,p);
528
529 if (!port->disable_rx && !port->throttle_input){ /* If input is not disabled */
530 newhead = status->InHead; /* 65EC02 write pointer */
531 bufpos = status->InTail;
532
533 /* check for input for this port */
534 if (newhead != bufpos) {
535 /* buffer for input chars/events */
536 ibuf = mem->InBuf[p];
537
538 /* data types of bytes in ibuf */
539 cbuf = mem->InCtl[p];
540
541 /* do for all chars */
542 while (bufpos != newhead) {
543 /* which type of input data? */
544 switch (cbuf[bufpos]) {
545 /* switch on input event (CD, BREAK, etc.) */
546 case A2232INCTL_EVENT:
547 switch (ibuf[bufpos++]) {
548 case A2232EVENT_Break:
549 /* TODO: Handle BREAK signal */
550 break;
551 /* A2232EVENT_CarrierOn and A2232EVENT_CarrierOff are
552 handled in a separate queue and should not occur here. */
553 case A2232EVENT_Sync:
554 printk("A2232: 65EC02 software sent SYNC event, don't know what to do. Ignoring.");
555 break;
556 default:
557 printk("A2232: 65EC02 software broken, unknown event type %d occurred.\n",ibuf[bufpos-1]);
558 } /* event type switch */
559 break;
560 case A2232INCTL_CHAR:
561 /* Receive incoming char */
562 a2232_receive_char(port, ibuf[bufpos], err);
563 bufpos++;
564 break;
565 default:
566 printk("A2232: 65EC02 software broken, unknown data type %d occurred.\n",cbuf[bufpos]);
567 bufpos++;
568 } /* switch on input data type */
569 } /* while there's something in the buffer */
570
571 status->InTail = bufpos; /* tell 65EC02 what we've read */
572
573 } /* if there was something in the buffer */
574 } /* If input is not disabled */
575
576 /* Now check if there's something to output */
577 obuf = mem->OutBuf[p];
578 bufpos = status->OutHead;
579 while ( (port->gs.xmit_cnt > 0) &&
580 (!port->gs.tty->stopped) &&
581 (!port->gs.tty->hw_stopped) ){ /* While there are chars to transmit */
582 if (((bufpos+1) & A2232_IOBUFLENMASK) != status->OutTail) { /* If the A2232 buffer is not full */
583 ch = port->gs.xmit_buf[port->gs.xmit_tail]; /* get the next char to transmit */
584 port->gs.xmit_tail = (port->gs.xmit_tail+1) & (SERIAL_XMIT_SIZE-1); /* modulo-addition for the gs.xmit_buf ring-buffer */
585 obuf[bufpos++] = ch; /* put it into the A2232 buffer */
586 port->gs.xmit_cnt--;
587 }
588 else{ /* If A2232 the buffer is full */
589 break; /* simply stop filling it. */
590 }
591 }
592 status->OutHead = bufpos;
593
594 /* WakeUp if output buffer runs low */
595 if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.tty) {
596 tty_wakeup(port->gs.tty);
597 }
598 } // if the port is used
599 } // for every port on the board
600
601 /* Now check the CD message queue */
602 newhead = mem->Common.CDHead;
603 bufpos = mem->Common.CDTail;
604 if (newhead != bufpos){ /* There are CD events in queue */
605 ocd = mem->Common.CDStatus; /* get old status bits */
606 while (newhead != bufpos){ /* read all events */
607 ncd = mem->CDBuf[bufpos++]; /* get one event */
608 ccd = ncd ^ ocd; /* mask of changed lines */
609 ocd = ncd; /* save new status bits */
610 for(p=0; p < NUMLINES; p++){ /* for all ports */
611 if (ccd & 1){ /* this one changed */
612
613 struct a2232_port *port = &a2232_ports[n*7+p];
614 port->cd_status = !(ncd & 1); /* ncd&1 <=> CD is now off */
615
616 if (!(port->gs.flags & ASYNC_CHECK_CD))
617 ; /* Don't report DCD changes */
618 else if (port->cd_status) { // if DCD on: DCD went UP!
619
620 /* Are we blocking in open?*/
621 wake_up_interruptible(&port->gs.open_wait);
622 }
623 else { // if DCD off: DCD went DOWN!
624 if (port->gs.tty)
625 tty_hangup (port->gs.tty);
626 }
627
628 } // if CD changed for this port
629 ccd >>= 1;
630 ncd >>= 1; /* Shift bits for next line */
631 } // for every port
632 } // while CD events in queue
633 mem->Common.CDStatus = ocd; /* save new status */
634 mem->Common.CDTail = bufpos; /* remove events */
635 } // if events in CD queue
636
637 } // for every completely initialized A2232 board
638 return IRQ_HANDLED;
639 }
640
641 static void a2232_init_portstructs(void)
642 {
643 struct a2232_port *port;
644 int i;
645
646 for (i = 0; i < MAX_A2232_BOARDS*NUMLINES; i++) {
647 port = a2232_ports + i;
648 port->which_a2232 = i/NUMLINES;
649 port->which_port_on_a2232 = i%NUMLINES;
650 port->disable_rx = port->throttle_input = port->cd_status = 0;
651 port->gs.magic = A2232_MAGIC;
652 port->gs.close_delay = HZ/2;
653 port->gs.closing_wait = 30 * HZ;
654 port->gs.rd = &a2232_real_driver;
655 #ifdef NEW_WRITE_LOCKING
656 init_MUTEX(&(port->gs.port_write_mutex));
657 #endif
658 init_waitqueue_head(&port->gs.open_wait);
659 init_waitqueue_head(&port->gs.close_wait);
660 }
661 }
662
663 static const struct tty_operations a2232_ops = {
664 .open = a2232_open,
665 .close = gs_close,
666 .write = gs_write,
667 .put_char = gs_put_char,
668 .flush_chars = gs_flush_chars,
669 .write_room = gs_write_room,
670 .chars_in_buffer = gs_chars_in_buffer,
671 .flush_buffer = gs_flush_buffer,
672 .ioctl = a2232_ioctl,
673 .throttle = a2232_throttle,
674 .unthrottle = a2232_unthrottle,
675 .set_termios = gs_set_termios,
676 .stop = gs_stop,
677 .start = gs_start,
678 .hangup = gs_hangup,
679 };
680
681 static int a2232_init_drivers(void)
682 {
683 int error;
684
685 a2232_driver = alloc_tty_driver(NUMLINES * nr_a2232);
686 if (!a2232_driver)
687 return -ENOMEM;
688 a2232_driver->owner = THIS_MODULE;
689 a2232_driver->driver_name = "commodore_a2232";
690 a2232_driver->name = "ttyY";
691 a2232_driver->major = A2232_NORMAL_MAJOR;
692 a2232_driver->type = TTY_DRIVER_TYPE_SERIAL;
693 a2232_driver->subtype = SERIAL_TYPE_NORMAL;
694 a2232_driver->init_termios = tty_std_termios;
695 a2232_driver->init_termios.c_cflag =
696 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
697 a2232_driver->init_termios.c_ispeed = 9600;
698 a2232_driver->init_termios.c_ospeed = 9600;
699 a2232_driver->flags = TTY_DRIVER_REAL_RAW;
700 tty_set_operations(a2232_driver, &a2232_ops);
701 if ((error = tty_register_driver(a2232_driver))) {
702 printk(KERN_ERR "A2232: Couldn't register A2232 driver, error = %d\n",
703 error);
704 put_tty_driver(a2232_driver);
705 return 1;
706 }
707 return 0;
708 }
709
710 static int __init a2232board_init(void)
711 {
712 struct zorro_dev *z;
713
714 unsigned int boardaddr;
715 int bcount;
716 short start;
717 u_char *from;
718 volatile u_char *to;
719 volatile struct a2232memory *mem;
720
721 #ifdef CONFIG_SMP
722 return -ENODEV; /* This driver is not SMP aware. Is there an SMP ZorroII-bus-machine? */
723 #endif
724
725 if (!MACH_IS_AMIGA){
726 return -ENODEV;
727 }
728
729 printk("Commodore A2232 driver initializing.\n"); /* Say that we're alive. */
730
731 z = NULL;
732 nr_a2232 = 0;
733 while ( (z = zorro_find_device(ZORRO_WILDCARD, z)) ){
734 if ( (z->id != ZORRO_PROD_CBM_A2232_PROTOTYPE) &&
735 (z->id != ZORRO_PROD_CBM_A2232) ){
736 continue; // The board found was no A2232
737 }
738 if (!zorro_request_device(z,"A2232 driver"))
739 continue;
740
741 printk("Commodore A2232 found (#%d).\n",nr_a2232);
742
743 zd_a2232[nr_a2232] = z;
744
745 boardaddr = ZTWO_VADDR( z->resource.start );
746 printk("Board is located at address 0x%x, size is 0x%x.\n", boardaddr, (unsigned int) ((z->resource.end+1) - (z->resource.start)));
747
748 mem = (volatile struct a2232memory *) boardaddr;
749
750 (void) mem->Enable6502Reset; /* copy the code across to the board */
751 to = (u_char *)mem; from = a2232_65EC02code; bcount = sizeof(a2232_65EC02code) - 2;
752 start = *(short *)from;
753 from += sizeof(start);
754 to += start;
755 while(bcount--) *to++ = *from++;
756 printk("65EC02 software uploaded to the A2232 memory.\n");
757
758 mem->Common.Crystal = A2232_UNKNOWN; /* use automatic speed check */
759
760 /* start 6502 running */
761 (void) mem->ResetBoard;
762 printk("A2232's 65EC02 CPU up and running.\n");
763
764 /* wait until speed detector has finished */
765 for (bcount = 0; bcount < 2000; bcount++) {
766 udelay(1000);
767 if (mem->Common.Crystal)
768 break;
769 }
770 printk((mem->Common.Crystal?"A2232 oscillator crystal detected by 65EC02 software: ":"65EC02 software could not determine A2232 oscillator crystal: "));
771 switch (mem->Common.Crystal){
772 case A2232_UNKNOWN:
773 printk("Unknown crystal.\n");
774 break;
775 case A2232_NORMAL:
776 printk ("Normal crystal.\n");
777 break;
778 case A2232_TURBO:
779 printk ("Turbo crystal.\n");
780 break;
781 default:
782 printk ("0x%x. Huh?\n",mem->Common.Crystal);
783 }
784
785 nr_a2232++;
786
787 }
788
789 printk("Total: %d A2232 boards initialized.\n", nr_a2232); /* Some status report if no card was found */
790
791 a2232_init_portstructs();
792
793 /*
794 a2232_init_drivers also registers the drivers. Must be here because all boards
795 have to be detected first.
796 */
797 if (a2232_init_drivers()) return -ENODEV; // maybe we should use a different -Exxx?
798
799 request_irq(IRQ_AMIGA_VERTB, a2232_vbl_inter, 0, "A2232 serial VBL", a2232_driver_ID);
800 return 0;
801 }
802
803 static void __exit a2232board_exit(void)
804 {
805 int i;
806
807 for (i = 0; i < nr_a2232; i++) {
808 zorro_release_device(zd_a2232[i]);
809 }
810
811 tty_unregister_driver(a2232_driver);
812 put_tty_driver(a2232_driver);
813 free_irq(IRQ_AMIGA_VERTB, a2232_driver_ID);
814 }
815
816 module_init(a2232board_init);
817 module_exit(a2232board_exit);
818
819 MODULE_AUTHOR("Enver Haase");
820 MODULE_DESCRIPTION("Amiga A2232 multi-serial board driver");
821 MODULE_LICENSE("GPL");
WRT350N Kernel Patches