File: /usr/src/linux/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
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 <asm/semaphore.h>
100
101 #include <linux/delay.h>
102
103 #include <linux/serial.h>
104 #include <linux/generic_serial.h>
105
106 #include "ser_a2232.h"
107 #include "ser_a2232fw.h"
108 /************************* End of Includes **************************/
109
110 /***************************** Prototypes ***************************/
111 /* Helper functions */
112 static __inline__ volatile struct a2232status *a2232stat(unsigned int board,
113 unsigned int portonboard);
114 static __inline__ volatile struct a2232memory *a2232mem (unsigned int board);
115 static __inline__ void a2232_receive_char( struct a2232_port *port,
116 int ch, int err );
117 /* The interrupt service routine */
118 static void a2232_vbl_inter(int irq, void *data, struct pt_regs *fp);
119 /* Initialize the port structures */
120 static void a2232_init_portstructs(void);
121 /* Initialize and register TTY drivers. */
122 /* returns 0 IFF successful */
123 static int a2232_init_drivers(void);
124 /* Initialize all A2232 boards; main entry point. */
125 int a2232board_init(void);
126
127 /* BEGIN GENERIC_SERIAL PROTOTYPES */
128 static void a2232_disable_tx_interrupts(void *ptr);
129 static void a2232_enable_tx_interrupts(void *ptr);
130 static void a2232_disable_rx_interrupts(void *ptr);
131 static void a2232_enable_rx_interrupts(void *ptr);
132 static int a2232_get_CD(void *ptr);
133 static void a2232_shutdown_port(void *ptr);
134 static int a2232_set_real_termios(void *ptr);
135 static int a2232_chars_in_buffer(void *ptr);
136 static void a2232_close(void *ptr);
137 static void a2232_hungup(void *ptr);
138 /* static void a2232_getserial (void *ptr, struct serial_struct *sp); */
139 /* END GENERIC_SERIAL PROTOTYPES */
140
141 /* Functions that the TTY driver struct expects */
142 static int a2232_ioctl(struct tty_struct *tty, struct file *file,
143 unsigned int cmd, unsigned long arg);
144 static void a2232_throttle(struct tty_struct *tty);
145 static void a2232_unthrottle(struct tty_struct *tty);
146 static int a2232_open(struct tty_struct * tty, struct file * filp);
147 /************************* End of Prototypes ************************/
148
149 /***************************** Global variables *********************/
150 /*---------------------------------------------------------------------------
151 * Interface from generic_serial.c back here
152 *--------------------------------------------------------------------------*/
153 static struct real_driver a2232_real_driver = {
154 a2232_disable_tx_interrupts,
155 a2232_enable_tx_interrupts,
156 a2232_disable_rx_interrupts,
157 a2232_enable_rx_interrupts,
158 a2232_get_CD,
159 a2232_shutdown_port,
160 a2232_set_real_termios,
161 a2232_chars_in_buffer,
162 a2232_close,
163 a2232_hungup,
164 NULL /* a2232_getserial */
165 };
166
167 static void *a2232_driver_ID = &a2232_driver_ID; // Some memory address WE own.
168
169 /* Ports structs */
170 static struct a2232_port a2232_ports[MAX_A2232_BOARDS*NUMLINES];
171
172 /* TTY driver structs */
173 static struct tty_driver a2232_driver;
174 static struct tty_driver a2232_callout_driver;
175
176 /* Variables used by the TTY driver */
177 static int a2232_refcount;
178 static struct tty_struct *a2232_table[MAX_A2232_BOARDS*NUMLINES] = { NULL, };
179 static struct termios *a2232_termios[MAX_A2232_BOARDS*NUMLINES];
180 static struct termios *a2232_termios_locked[MAX_A2232_BOARDS*NUMLINES];
181
182 /* nr of cards completely (all ports) and correctly configured */
183 static int nr_a2232;
184
185 /* zorro_dev structs for the A2232's */
186 static struct zorro_dev *zd_a2232[MAX_A2232_BOARDS];
187 /***************************** End of Global variables **************/
188
189 /***************************** Functions ****************************/
190 /*** BEGIN OF REAL_DRIVER FUNCTIONS ***/
191
192 static void a2232_disable_tx_interrupts(void *ptr)
193 {
194 struct a2232_port *port;
195 volatile struct a2232status *stat;
196 unsigned long flags;
197
198 port = ptr;
199 stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
200 stat->OutDisable = -1;
201
202 /* Does this here really have to be? */
203 save_flags(flags);
204 cli();
205 port->gs.flags &= ~GS_TX_INTEN;
206 restore_flags(flags);
207 }
208
209 static void a2232_enable_tx_interrupts(void *ptr)
210 {
211 struct a2232_port *port;
212 volatile struct a2232status *stat;
213 unsigned long flags;
214
215 port = ptr;
216 stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
217 stat->OutDisable = 0;
218
219 /* Does this here really have to be? */
220 save_flags(flags);
221 cli();
222 port->gs.flags |= GS_TX_INTEN;
223 restore_flags(flags);
224 }
225
226 static void a2232_disable_rx_interrupts(void *ptr)
227 {
228 struct a2232_port *port;
229 port = ptr;
230 port->disable_rx = -1;
231 }
232
233 static void a2232_enable_rx_interrupts(void *ptr)
234 {
235 struct a2232_port *port;
236 port = ptr;
237 port->disable_rx = 0;
238 }
239
240 static int a2232_get_CD(void *ptr)
241 {
242 return ((struct a2232_port *) ptr)->cd_status;
243 }
244
245 static void a2232_shutdown_port(void *ptr)
246 {
247 struct a2232_port *port;
248 volatile struct a2232status *stat;
249 unsigned long flags;
250
251 port = ptr;
252 stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
253
254 save_flags(flags);
255 cli();
256
257 port->gs.flags &= ~GS_ACTIVE;
258
259 if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
260 /* Set DTR and RTS to Low, flush output.
261 The NetBSD driver "msc.c" does it this way. */
262 stat->Command = ( (stat->Command & ~A2232CMD_CMask) |
263 A2232CMD_Close );
264 stat->OutFlush = -1;
265 stat->Setup = -1;
266 }
267
268 restore_flags(flags);
269
270 /* After analyzing control flow, I think a2232_shutdown_port
271 is actually the last call from the system when at application
272 level someone issues a "echo Hello >>/dev/ttyY0".
273 Therefore I think the MOD_DEC_USE_COUNT should be here and
274 not in "a2232_close()". See the comment in "sx.c", too.
275 If you run into problems, compile this driver into the
276 kernel instead of compiling it as a module. */
277 MOD_DEC_USE_COUNT;
278 }
279
280 static int a2232_set_real_termios(void *ptr)
281 {
282 unsigned int cflag, baud, chsize, stopb, parity, softflow;
283 int rate;
284 int a2232_param, a2232_cmd;
285 unsigned long flags;
286 unsigned int i;
287 struct a2232_port *port = ptr;
288 volatile struct a2232status *status;
289 volatile struct a2232memory *mem;
290
291 if (!port->gs.tty || !port->gs.tty->termios) return 0;
292
293 status = a2232stat(port->which_a2232, port->which_port_on_a2232);
294 mem = a2232mem(port->which_a2232);
295
296 a2232_param = a2232_cmd = 0;
297
298 // get baud rate
299 baud = port->gs.baud;
300 if (baud == 0) {
301 /* speed == 0 -> drop DTR, do nothing else */
302 save_flags(flags);
303 cli();
304 // Clear DTR (and RTS... mhhh).
305 status->Command = ( (status->Command & ~A2232CMD_CMask) |
306 A2232CMD_Close );
307 status->OutFlush = -1;
308 status->Setup = -1;
309
310 restore_flags(flags);
311 return 0;
312 }
313
314 rate = A2232_BAUD_TABLE_NOAVAIL;
315 for (i=0; i < A2232_BAUD_TABLE_NUM_RATES * 3; i += 3){
316 if (a2232_baud_table[i] == baud){
317 if (mem->Common.Crystal == A2232_TURBO) rate = a2232_baud_table[i+2];
318 else rate = a2232_baud_table[i+1];
319 }
320 }
321 if (rate == A2232_BAUD_TABLE_NOAVAIL){
322 printk("a2232: Board %d Port %d unsupported baud rate: %d baud. Using another.\n",port->which_a2232,port->which_port_on_a2232,baud);
323 // This is useful for both (turbo or normal) Crystal versions.
324 rate = A2232PARAM_B9600;
325 }
326 a2232_param |= rate;
327
328 cflag = port->gs.tty->termios->c_cflag;
329
330 // get character size
331 chsize = cflag & CSIZE;
332 switch (chsize){
333 case CS8: a2232_param |= A2232PARAM_8Bit; break;
334 case CS7: a2232_param |= A2232PARAM_7Bit; break;
335 case CS6: a2232_param |= A2232PARAM_6Bit; break;
336 case CS5: a2232_param |= A2232PARAM_5Bit; break;
337 default: printk("a2232: Board %d Port %d unsupported character size: %d. Using 8 data bits.\n",
338 port->which_a2232,port->which_port_on_a2232,chsize);
339 a2232_param |= A2232PARAM_8Bit; break;
340 }
341
342 // get number of stop bits
343 stopb = cflag & CSTOPB;
344 if (stopb){ // two stop bits instead of one
345 printk("a2232: Board %d Port %d 2 stop bits unsupported. Using 1 stop bit.\n",
346 port->which_a2232,port->which_port_on_a2232);
347 }
348
349 // Warn if RTS/CTS not wanted
350 if (!(cflag & CRTSCTS)){
351 #ifndef A2232_SUPPRESS_RTSCTS_WARNING
352 printk("a2232: Board %d Port %d cannot switch off firmware-implemented RTS/CTS hardware flow control.\n",
353 port->which_a2232,port->which_port_on_a2232);
354 #endif
355 }
356
357 /* I think this is correct.
358 However, IXOFF means _input_ flow control and I wonder
359 if one should care about IXON _output_ flow control,
360 too. If this makes problems, one should turn the A2232
361 firmware XON/XOFF "SoftFlow" flow control off and use
362 the conventional way of inserting START/STOP characters
363 by hand in throttle()/unthrottle().
364 */
365 softflow = !!( port->gs.tty->termios->c_iflag & IXOFF );
366
367 // get Parity (Enabled/Disabled? If Enabled, Odd or Even?)
368 parity = cflag & (PARENB | PARODD);
369 if (parity & PARENB){
370 if (parity & PARODD){
371 a2232_cmd |= A2232CMD_OddParity;
372 }
373 else{
374 a2232_cmd |= A2232CMD_EvenParity;
375 }
376 }
377 else a2232_cmd |= A2232CMD_NoParity;
378
379
380 /* Hmm. Maybe an own a2232_port structure
381 member would be cleaner? */
382 if (cflag & CLOCAL)
383 port->gs.flags &= ~ASYNC_CHECK_CD;
384 else
385 port->gs.flags |= ASYNC_CHECK_CD;
386
387
388 /* Now we have all parameters and can go to set them: */
389 save_flags(flags);
390 cli();
391
392 status->Param = a2232_param | A2232PARAM_RcvBaud;
393 status->Command = a2232_cmd | A2232CMD_Open | A2232CMD_Enable;
394 status->SoftFlow = softflow;
395 status->OutDisable = 0;
396 status->Setup = -1;
397
398 restore_flags(flags);
399 return 0;
400 }
401
402 static int a2232_chars_in_buffer(void *ptr)
403 {
404 struct a2232_port *port;
405 volatile struct a2232status *status;
406 unsigned char ret; /* we need modulo-256 arithmetics */
407 port = ptr;
408 status = a2232stat(port->which_a2232, port->which_port_on_a2232);
409 #if A2232_IOBUFLEN != 256
410 #error "Re-Implement a2232_chars_in_buffer()!"
411 #endif
412 ret = (status->OutHead - status->OutTail);
413 return ret;
414 }
415
416 static void a2232_close(void *ptr)
417 {
418 a2232_disable_tx_interrupts(ptr);
419 a2232_disable_rx_interrupts(ptr);
420 /* see the comment in a2232_shutdown_port above. */
421 /* MOD_DEC_USE_COUNT; */
422 }
423
424 static void a2232_hungup(void *ptr)
425 {
426 a2232_close(ptr);
427 }
428 /*** END OF REAL_DRIVER FUNCTIONS ***/
429
430 /*** BEGIN FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
431 static int a2232_ioctl( struct tty_struct *tty, struct file *file,
432 unsigned int cmd, unsigned long arg)
433 {
434 return -ENOIOCTLCMD;
435 }
436
437 static void a2232_throttle(struct tty_struct *tty)
438 {
439 /* Throttle: System cannot take another chars: Drop RTS or
440 send the STOP char or whatever.
441 The A2232 firmware does RTS/CTS anyway, and XON/XOFF
442 if switched on. So the only thing we can do at this
443 layer here is not taking any characters out of the
444 A2232 buffer any more. */
445 struct a2232_port *port = (struct a2232_port *) tty->driver_data;
446 port->throttle_input = -1;
447 }
448
449 static void a2232_unthrottle(struct tty_struct *tty)
450 {
451 /* Unthrottle: dual to "throttle()" above. */
452 struct a2232_port *port = (struct a2232_port *) tty->driver_data;
453 port->throttle_input = 0;
454 }
455
456 static int a2232_open(struct tty_struct * tty, struct file * filp)
457 {
458 /* More or less stolen from other drivers. */
459 int line;
460 int retval;
461 struct a2232_port *port;
462
463 line = MINOR(tty->device);
464 port = &a2232_ports[line];
465
466 tty->driver_data = port;
467 port->gs.tty = tty;
468 port->gs.count++;
469 retval = gs_init_port(&port->gs);
470 if (retval) {
471 port->gs.count--;
472 return retval;
473 }
474 port->gs.flags |= GS_ACTIVE;
475 if (port->gs.count == 1) {
476 MOD_INC_USE_COUNT;
477 }
478 retval = gs_block_til_ready(port, filp);
479
480 if (retval) {
481 MOD_DEC_USE_COUNT;
482 port->gs.count--;
483 return retval;
484 }
485
486 if ((port->gs.count == 1) && (port->gs.flags & ASYNC_SPLIT_TERMIOS)){
487 if (tty->driver.subtype == A2232_TTY_SUBTYPE_NORMAL)
488 *tty->termios = port->gs.normal_termios;
489 else
490 *tty->termios = port->gs.callout_termios;
491 a2232_set_real_termios (port);
492 }
493
494 port->gs.session = current->session;
495 port->gs.pgrp = current->pgrp;
496
497 a2232_enable_rx_interrupts(port);
498
499 return 0;
500 }
501 /*** END OF FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
502
503 static __inline__ volatile struct a2232status *a2232stat(unsigned int board, unsigned int portonboard)
504 {
505 volatile struct a2232memory *mem = a2232mem(board);
506 return &(mem->Status[portonboard]);
507 }
508
509 static __inline__ volatile struct a2232memory *a2232mem (unsigned int board)
510 {
511 return (volatile struct a2232memory *) ZTWO_VADDR( zd_a2232[board]->resource.start );
512 }
513
514 static __inline__ void a2232_receive_char( struct a2232_port *port,
515 int ch, int err )
516 {
517 /* Mostly stolen from other drivers.
518 Maybe one could implement a more efficient version by not only
519 transferring one character at a time.
520 */
521 struct tty_struct *tty = port->gs.tty;
522
523 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
524 return;
525
526 tty->flip.count++;
527
528 #if 0
529 switch(err) {
530 case TTY_BREAK:
531 break;
532 case TTY_PARITY:
533 break;
534 case TTY_OVERRUN:
535 break;
536 case TTY_FRAME:
537 break;
538 }
539 #endif
540
541 *tty->flip.flag_buf_ptr++ = err;
542 *tty->flip.char_buf_ptr++ = ch;
543 tty_flip_buffer_push(tty);
544 }
545
546 static void a2232_vbl_inter(int irq, void *data, struct pt_regs *fp)
547 {
548 #if A2232_IOBUFLEN != 256
549 #error "Re-Implement a2232_vbl_inter()!"
550 #endif
551
552 struct a2232_port *port;
553 volatile struct a2232memory *mem;
554 volatile struct a2232status *status;
555 unsigned char newhead;
556 unsigned char bufpos; /* Must be unsigned char. We need the modulo-256 arithmetics */
557 unsigned char ncd, ocd, ccd; /* names consistent with the NetBSD driver */
558 volatile u_char *ibuf, *cbuf, *obuf;
559 int ch, err, n, p;
560 for (n = 0; n < nr_a2232; n++){ /* for every completely initialized A2232 board */
561 mem = a2232mem(n);
562 for (p = 0; p < NUMLINES; p++){ /* for every port on this board */
563 err = 0;
564 port = &a2232_ports[n*NUMLINES+p];
565 if ( port->gs.flags & GS_ACTIVE ){ /* if the port is used */
566
567 status = a2232stat(n,p);
568
569 if (!port->disable_rx && !port->throttle_input){ /* If input is not disabled */
570 newhead = status->InHead; /* 65EC02 write pointer */
571 bufpos = status->InTail;
572
573 /* check for input for this port */
574 if (newhead != bufpos) {
575 /* buffer for input chars/events */
576 ibuf = mem->InBuf[p];
577
578 /* data types of bytes in ibuf */
579 cbuf = mem->InCtl[p];
580
581 /* do for all chars */
582 while (bufpos != newhead) {
583 /* which type of input data? */
584 switch (cbuf[bufpos]) {
585 /* switch on input event (CD, BREAK, etc.) */
586 case A2232INCTL_EVENT:
587 switch (ibuf[bufpos++]) {
588 case A2232EVENT_Break:
589 /* TODO: Handle BREAK signal */
590 break;
591 /* A2232EVENT_CarrierOn and A2232EVENT_CarrierOff are
592 handled in a separate queue and should not occur here. */
593 case A2232EVENT_Sync:
594 printk("A2232: 65EC02 software sent SYNC event, don't know what to do. Ignoring.");
595 break;
596 default:
597 printk("A2232: 65EC02 software broken, unknown event type %d occured.\n",ibuf[bufpos-1]);
598 } /* event type switch */
599 break;
600 case A2232INCTL_CHAR:
601 /* Receive incoming char */
602 a2232_receive_char(port, ibuf[bufpos], err);
603 bufpos++;
604 break;
605 default:
606 printk("A2232: 65EC02 software broken, unknown data type %d occured.\n",cbuf[bufpos]);
607 bufpos++;
608 } /* switch on input data type */
609 } /* while there's something in the buffer */
610
611 status->InTail = bufpos; /* tell 65EC02 what we've read */
612
613 } /* if there was something in the buffer */
614 } /* If input is not disabled */
615
616 /* Now check if there's something to output */
617 obuf = mem->OutBuf[p];
618 bufpos = status->OutHead;
619 while ( (port->gs.xmit_cnt > 0) &&
620 (!port->gs.tty->stopped) &&
621 (!port->gs.tty->hw_stopped) ){ /* While there are chars to transmit */
622 if (((bufpos+1) & A2232_IOBUFLENMASK) != status->OutTail) { /* If the A2232 buffer is not full */
623 ch = port->gs.xmit_buf[port->gs.xmit_tail]; /* get the next char to transmit */
624 port->gs.xmit_tail = (port->gs.xmit_tail+1) & (SERIAL_XMIT_SIZE-1); /* modulo-addition for the gs.xmit_buf ring-buffer */
625 obuf[bufpos++] = ch; /* put it into the A2232 buffer */
626 port->gs.xmit_cnt--;
627 }
628 else{ /* If A2232 the buffer is full */
629 break; /* simply stop filling it. */
630 }
631 }
632 status->OutHead = bufpos;
633
634 /* WakeUp if output buffer runs low */
635 if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.tty) {
636 if ((port->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && port->gs.tty->ldisc.write_wakeup){
637 (port->gs.tty->ldisc.write_wakeup)(port->gs.tty);
638 }
639 wake_up_interruptible(&port->gs.tty->write_wait);
640 }
641 } // if the port is used
642 } // for every port on the board
643
644 /* Now check the CD message queue */
645 newhead = mem->Common.CDHead;
646 bufpos = mem->Common.CDTail;
647 if (newhead != bufpos){ /* There are CD events in queue */
648 ocd = mem->Common.CDStatus; /* get old status bits */
649 while (newhead != bufpos){ /* read all events */
650 ncd = mem->CDBuf[bufpos++]; /* get one event */
651 ccd = ncd ^ ocd; /* mask of changed lines */
652 ocd = ncd; /* save new status bits */
653 for(p=0; p < NUMLINES; p++){ /* for all ports */
654 if (ccd & 1){ /* this one changed */
655
656 struct a2232_port *port = &a2232_ports[n*7+p];
657 port->cd_status = !(ncd & 1); /* ncd&1 <=> CD is now off */
658
659 if (!(port->gs.flags & ASYNC_CHECK_CD))
660 ; /* Don't report DCD changes */
661 else if (port->cd_status) { // if DCD on: DCD went UP!
662 if (~(port->gs.flags & ASYNC_NORMAL_ACTIVE) ||
663 ~(port->gs.flags & ASYNC_CALLOUT_ACTIVE)) {
664 /* Are we blocking in open?*/
665 wake_up_interruptible(&port->gs.open_wait);
666 }
667 }
668 else { // if DCD off: DCD went DOWN!
669 if (!((port->gs.flags & ASYNC_CALLOUT_ACTIVE) &&
670 (port->gs.flags & ASYNC_CALLOUT_NOHUP))) {
671 if (port->gs.tty)
672 tty_hangup (port->gs.tty);
673 }
674 }
675
676 } // if CD changed for this port
677 ccd >>= 1;
678 ncd >>= 1; /* Shift bits for next line */
679 } // for every port
680 } // while CD events in queue
681 mem->Common.CDStatus = ocd; /* save new status */
682 mem->Common.CDTail = bufpos; /* remove events */
683 } // if events in CD queue
684
685 } // for every completely initialized A2232 board
686 }
687
688 static void a2232_init_portstructs(void)
689 {
690 struct a2232_port *port;
691 int i;
692
693 for (i = 0; i < MAX_A2232_BOARDS*NUMLINES; i++) {
694 port = a2232_ports + i;
695 port->which_a2232 = i/NUMLINES;
696 port->which_port_on_a2232 = i%NUMLINES;
697 port->disable_rx = port->throttle_input = port->cd_status = 0;
698 port->gs.callout_termios = tty_std_termios;
699 port->gs.normal_termios = tty_std_termios;
700 port->gs.magic = A2232_MAGIC;
701 port->gs.close_delay = HZ/2;
702 port->gs.closing_wait = 30 * HZ;
703 port->gs.rd = &a2232_real_driver;
704 #ifdef NEW_WRITE_LOCKING
705 init_MUTEX(&(port->gs.port_write_sem));
706 #endif
707 init_waitqueue_head(&port->gs.open_wait);
708 init_waitqueue_head(&port->gs.close_wait);
709 }
710 }
711
712 static int a2232_init_drivers(void)
713 {
714 int error;
715
716 memset(&a2232_driver, 0, sizeof(a2232_driver));
717 a2232_driver.magic = TTY_DRIVER_MAGIC;
718 a2232_driver.driver_name = "commodore_a2232";
719 a2232_driver.name = "ttyY";
720 a2232_driver.major = A2232_NORMAL_MAJOR;
721 a2232_driver.num = NUMLINES * nr_a2232;
722 a2232_driver.type = TTY_DRIVER_TYPE_SERIAL;
723 a2232_driver.subtype = A2232_TTY_SUBTYPE_NORMAL;
724 a2232_driver.init_termios = tty_std_termios;
725 a2232_driver.init_termios.c_cflag =
726 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
727 a2232_driver.flags = TTY_DRIVER_REAL_RAW;
728 a2232_driver.refcount = &a2232_refcount;
729 a2232_driver.table = a2232_table;
730 a2232_driver.termios = a2232_termios;
731 a2232_driver.termios_locked = a2232_termios_locked;
732
733 a2232_driver.open = a2232_open;
734 a2232_driver.close = gs_close;
735 a2232_driver.write = gs_write;
736 a2232_driver.put_char = gs_put_char;
737 a2232_driver.flush_chars = gs_flush_chars;
738 a2232_driver.write_room = gs_write_room;
739 a2232_driver.chars_in_buffer = gs_chars_in_buffer;
740 a2232_driver.flush_buffer = gs_flush_buffer;
741 a2232_driver.ioctl = a2232_ioctl;
742 a2232_driver.throttle = a2232_throttle;
743 a2232_driver.unthrottle = a2232_unthrottle;
744 a2232_driver.set_termios = gs_set_termios;
745 a2232_driver.stop = gs_stop;
746 a2232_driver.start = gs_start;
747 a2232_driver.hangup = gs_hangup;
748
749 a2232_callout_driver = a2232_driver;
750 a2232_callout_driver.name = "cuy";
751 a2232_callout_driver.major = A2232_CALLOUT_MAJOR;
752 a2232_callout_driver.subtype = A2232_TTY_SUBTYPE_CALLOUT;
753
754 if ((error = tty_register_driver(&a2232_driver))) {
755 printk(KERN_ERR "A2232: Couldn't register A2232 driver, error = %d\n",
756 error);
757 return 1;
758 }
759 if ((error = tty_register_driver(&a2232_callout_driver))) {
760 tty_unregister_driver(&a2232_driver);
761 printk(KERN_ERR "A2232: Couldn't register A2232 callout driver, error = %d\n",
762 error);
763 return 1;
764 }
765 return 0;
766 }
767
768 int a2232board_init(void)
769 {
770 struct zorro_dev *z;
771
772 unsigned int boardaddr;
773 int bcount;
774 short start;
775 u_char *from;
776 volatile u_char *to;
777 volatile struct a2232memory *mem;
778
779 #ifdef __SMP__
780 return -ENODEV; /* This driver is not SMP aware. Is there an SMP ZorroII-bus-machine? */
781 #endif
782
783 if (!MACH_IS_AMIGA){
784 return -ENODEV;
785 }
786
787 printk("Commodore A2232 driver initializing.\n"); /* Say that we're alive. */
788
789 z = NULL;
790 nr_a2232 = 0;
791 while ( (z = zorro_find_device(ZORRO_WILDCARD, z)) ){
792 if ( (z->id != ZORRO_PROD_CBM_A2232_PROTOTYPE) &&
793 (z->id != ZORRO_PROD_CBM_A2232) ){
794 continue; // The board found was no A2232
795 }
796 if (!zorro_request_device(z,"A2232 driver"))
797 continue;
798
799 printk("Commodore A2232 found (#%d).\n",nr_a2232);
800
801 zd_a2232[nr_a2232] = z;
802
803 boardaddr = ZTWO_VADDR( z->resource.start );
804 printk("Board is located at address 0x%x, size is 0x%x.\n", boardaddr, (unsigned int) ((z->resource.end+1) - (z->resource.start)));
805
806 mem = (volatile struct a2232memory *) boardaddr;
807
808 (void) mem->Enable6502Reset; /* copy the code across to the board */
809 to = (u_char *)mem; from = a2232_65EC02code; bcount = sizeof(a2232_65EC02code) - 2;
810 start = *(short *)from;
811 from += sizeof(start);
812 to += start;
813 while(bcount--) *to++ = *from++;
814 printk("65EC02 software uploaded to the A2232 memory.\n");
815
816 mem->Common.Crystal = A2232_UNKNOWN; /* use automatic speed check */
817
818 /* start 6502 running */
819 (void) mem->ResetBoard;
820 printk("A2232's 65EC02 CPU up and running.\n");
821
822 /* wait until speed detector has finished */
823 for (bcount = 0; bcount < 2000; bcount++) {
824 udelay(1000);
825 if (mem->Common.Crystal)
826 break;
827 }
828 printk((mem->Common.Crystal?"A2232 oscillator crystal detected by 65EC02 software: ":"65EC02 software could not determine A2232 oscillator crystal: "));
829 switch (mem->Common.Crystal){
830 case A2232_UNKNOWN:
831 printk("Unknown crystal.\n");
832 break;
833 case A2232_NORMAL:
834 printk ("Normal crystal.\n");
835 break;
836 case A2232_TURBO:
837 printk ("Turbo crystal.\n");
838 break;
839 default:
840 printk ("0x%x. Huh?\n",mem->Common.Crystal);
841 }
842
843 nr_a2232++;
844
845 }
846
847 printk("Total: %d A2232 boards initialized.\n.", nr_a2232); /* Some status report if no card was found */
848
849 a2232_init_portstructs();
850
851 /*
852 a2232_init_drivers also registers the drivers. Must be here because all boards
853 have to be detected first.
854 */
855 if (a2232_init_drivers()) return -ENODEV; // maybe we should use a different -Exxx?
856
857 request_irq(IRQ_AMIGA_VERTB, a2232_vbl_inter, 0, "A2232 serial VBL", a2232_driver_ID);
858 return 0;
859 }
860
861 #ifdef MODULE
862 int init_module(void)
863 {
864 return a2232board_init();
865 }
866
867 void cleanup_module(void)
868 {
869 int i;
870
871 for (i = 0; i < nr_a2232; i++) {
872 zorro_release_device(zd_a2232[i]);
873 }
874
875 tty_unregister_driver(&a2232_driver);
876 tty_unregister_driver(&a2232_callout_driver);
877 free_irq(IRQ_AMIGA_VERTB, a2232_driver_ID);
878 }
879 #endif
880 /***************************** End of Functions *********************/
881
882 MODULE_AUTHOR("Enver Haase");
883 MODULE_DESCRIPTION("Amiga A2232 multi-serial board driver");
884 MODULE_LICENSE("GPL");
885