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Btrfs: Fix oopsen when dropping empty tree.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / char / sx.c
bloba81ec4fcf6ff4480b9473587d5424b09cb74510e
1 /* sx.c -- driver for the Specialix SX series cards.
2 *
3 * This driver will also support the older SI, and XIO cards.
4 *
5 *
6 * (C) 1998 - 2004 R.E.Wolff@BitWizard.nl
7 *
8 * Simon Allen (simonallen@cix.compulink.co.uk) wrote a previous
9 * version of this driver. Some fragments may have been copied. (none
10 * yet :-)
11 *
12 * Specialix pays for the development and support of this driver.
13 * Please DO contact support@specialix.co.uk if you require
14 * support. But please read the documentation (sx.txt) first.
15 *
16 *
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License as
20 * published by the Free Software Foundation; either version 2 of
21 * the License, or (at your option) any later version.
22 *
23 * This program is distributed in the hope that it will be
24 * useful, but WITHOUT ANY WARRANTY; without even the implied
25 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
26 * PURPOSE. See the GNU General Public License for more details.
27 *
28 * You should have received a copy of the GNU General Public
29 * License along with this program; if not, write to the Free
30 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
31 * USA.
32 *
33 * Revision history:
34 * Revision 1.33 2000/03/09 10:00:00 pvdl,wolff
35 * - Fixed module and port counting
36 * - Fixed signal handling
37 * - Fixed an Ooops
38 *
39 * Revision 1.32 2000/03/07 09:00:00 wolff,pvdl
40 * - Fixed some sx_dprintk typos
41 * - added detection for an invalid board/module configuration
42 *
43 * Revision 1.31 2000/03/06 12:00:00 wolff,pvdl
44 * - Added support for EISA
45 *
46 * Revision 1.30 2000/01/21 17:43:06 wolff
47 * - Added support for SX+
48 *
49 * Revision 1.26 1999/08/05 15:22:14 wolff
50 * - Port to 2.3.x
51 * - Reformatted to Linus' liking.
52 *
53 * Revision 1.25 1999/07/30 14:24:08 wolff
54 * Had accidentally left "gs_debug" set to "-1" instead of "off" (=0).
55 *
56 * Revision 1.24 1999/07/28 09:41:52 wolff
57 * - I noticed the remark about use-count straying in sx.txt. I checked
58 * sx_open, and found a few places where that could happen. I hope it's
59 * fixed now.
60 *
61 * Revision 1.23 1999/07/28 08:56:06 wolff
62 * - Fixed crash when sx_firmware run twice.
63 * - Added sx_slowpoll as a module parameter (I guess nobody really wanted
64 * to change it from the default... )
65 * - Fixed a stupid editing problem I introduced in 1.22.
66 * - Fixed dropping characters on a termios change.
67 *
68 * Revision 1.22 1999/07/26 21:01:43 wolff
69 * Russell Brown noticed that I had overlooked 4 out of six modem control
70 * signals in sx_getsignals. Ooops.
71 *
72 * Revision 1.21 1999/07/23 09:11:33 wolff
73 * I forgot to free dynamically allocated memory when the driver is unloaded.
74 *
75 * Revision 1.20 1999/07/20 06:25:26 wolff
76 * The "closing wait" wasn't honoured. Thanks to James Griffiths for
77 * reporting this.
78 *
79 * Revision 1.19 1999/07/11 08:59:59 wolff
80 * Fixed an oops in close, when an open was pending. Changed the memtest
81 * a bit. Should also test the board in word-mode, however my card fails the
82 * memtest then. I still have to figure out what is wrong...
83 *
84 * Revision 1.18 1999/06/10 09:38:42 wolff
85 * Changed the format of the firmware revision from %04x to %x.%02x .
86 *
87 * Revision 1.17 1999/06/04 09:44:35 wolff
88 * fixed problem: reference to pci stuff when config_pci was off...
89 * Thanks to Jorge Novo for noticing this.
90 *
91 * Revision 1.16 1999/06/02 08:30:15 wolff
92 * added/removed the workaround for the DCD bug in the Firmware.
93 * A bit more debugging code to locate that...
94 *
95 * Revision 1.15 1999/06/01 11:35:30 wolff
96 * when DCD is left low (floating?), on TA's the firmware first tells us
97 * that DCD is high, but after a short while suddenly comes to the
98 * conclusion that it is low. All this would be fine, if it weren't that
99 * Unix requires us to send a "hangup" signal in that case. This usually
100 * all happens BEFORE the program has had a chance to ioctl the device
101 * into clocal mode..
102 *
103 * Revision 1.14 1999/05/25 11:18:59 wolff
104 * Added PCI-fix.
105 * Added checks for return code of sx_sendcommand.
106 * Don't issue "reconfig" if port isn't open yet. (bit us on TA modules...)
107 *
108 * Revision 1.13 1999/04/29 15:18:01 wolff
109 * Fixed an "oops" that showed on SuSE 6.0 systems.
110 * Activate DTR again after stty 0.
111 *
112 * Revision 1.12 1999/04/29 07:49:52 wolff
113 * Improved "stty 0" handling a bit. (used to change baud to 9600 assuming
114 * the connection would be dropped anyway. That is not always the case,
115 * and confuses people).
116 * Told the card to always monitor the modem signals.
117 * Added support for dynamic gs_debug adjustments.
118 * Now tells the rest of the system the number of ports.
119 *
120 * Revision 1.11 1999/04/24 11:11:30 wolff
121 * Fixed two stupid typos in the memory test.
122 *
123 * Revision 1.10 1999/04/24 10:53:39 wolff
124 * Added some of Christian's suggestions.
125 * Fixed an HW_COOK_IN bug (ISIG was not in I_OTHER. We used to trust the
126 * card to send the signal to the process.....)
127 *
128 * Revision 1.9 1999/04/23 07:26:38 wolff
129 * Included Christian Lademann's 2.0 compile-warning fixes and interrupt
130 * assignment redesign.
131 * Cleanup of some other stuff.
132 *
133 * Revision 1.8 1999/04/16 13:05:30 wolff
134 * fixed a DCD change unnoticed bug.
135 *
136 * Revision 1.7 1999/04/14 22:19:51 wolff
137 * Fixed typo that showed up in 2.0.x builds (get_user instead of Get_user!)
138 *
139 * Revision 1.6 1999/04/13 18:40:20 wolff
140 * changed misc-minor to 161, as assigned by HPA.
141 *
142 * Revision 1.5 1999/04/13 15:12:25 wolff
143 * Fixed use-count leak when "hangup" occurred.
144 * Added workaround for a stupid-PCIBIOS bug.
145 *
146 *
147 * Revision 1.4 1999/04/01 22:47:40 wolff
148 * Fixed < 1M linux-2.0 problem.
149 * (vremap isn't compatible with ioremap in that case)
150 *
151 * Revision 1.3 1999/03/31 13:45:45 wolff
152 * Firmware loading is now done through a separate IOCTL.
153 *
154 * Revision 1.2 1999/03/28 12:22:29 wolff
155 * rcs cleanup
156 *
157 * Revision 1.1 1999/03/28 12:10:34 wolff
158 * Readying for release on 2.0.x (sorry David, 1.01 becomes 1.1 for RCS).
159 *
160 * Revision 0.12 1999/03/28 09:20:10 wolff
161 * Fixed problem in 0.11, continueing cleanup.
162 *
163 * Revision 0.11 1999/03/28 08:46:44 wolff
164 * cleanup. Not good.
165 *
166 * Revision 0.10 1999/03/28 08:09:43 wolff
167 * Fixed loosing characters on close.
168 *
169 * Revision 0.9 1999/03/21 22:52:01 wolff
170 * Ported back to 2.2.... (minor things)
171 *
172 * Revision 0.8 1999/03/21 22:40:33 wolff
173 * Port to 2.0
174 *
175 * Revision 0.7 1999/03/21 19:06:34 wolff
176 * Fixed hangup processing.
177 *
178 * Revision 0.6 1999/02/05 08:45:14 wolff
179 * fixed real_raw problems. Inclusion into kernel imminent.
180 *
181 * Revision 0.5 1998/12/21 23:51:06 wolff
182 * Snatched a nasty bug: sx_transmit_chars was getting re-entered, and it
183 * shouldn't have. THATs why I want to have transmit interrupts even when
184 * the buffer is empty.
185 *
186 * Revision 0.4 1998/12/17 09:34:46 wolff
187 * PPP works. ioctl works. Basically works!
188 *
189 * Revision 0.3 1998/12/15 13:05:18 wolff
190 * It works! Wow! Gotta start implementing IOCTL and stuff....
191 *
192 * Revision 0.2 1998/12/01 08:33:53 wolff
193 * moved over to 2.1.130
194 *
195 * Revision 0.1 1998/11/03 21:23:51 wolff
196 * Initial revision. Detects SX card.
197 *
198 * */
199
200 #define SX_VERSION 1.33
201
202 #include <linux/module.h>
203 #include <linux/kdev_t.h>
204 #include <linux/kernel.h>
205 #include <linux/sched.h>
206 #include <linux/ioport.h>
207 #include <linux/interrupt.h>
208 #include <linux/errno.h>
209 #include <linux/tty.h>
210 #include <linux/tty_flip.h>
211 #include <linux/mm.h>
212 #include <linux/serial.h>
213 #include <linux/fcntl.h>
214 #include <linux/major.h>
215 #include <linux/delay.h>
216 #include <linux/eisa.h>
217 #include <linux/pci.h>
218 #include <linux/slab.h>
219 #include <linux/smp_lock.h>
220 #include <linux/init.h>
221 #include <linux/miscdevice.h>
222 #include <linux/bitops.h>
223
224 #include <asm/io.h>
225 #include <asm/uaccess.h>
226
227 /* The 3.0.0 version of sxboards/sxwindow.h uses BYTE and WORD.... */
228 #define BYTE u8
229 #define WORD u16
230
231 /* .... but the 3.0.4 version uses _u8 and _u16. */
232 #define _u8 u8
233 #define _u16 u16
234
235 #include "sxboards.h"
236 #include "sxwindow.h"
237
238 #include <linux/generic_serial.h>
239 #include "sx.h"
240
241 /* I don't think that this driver can handle more than 256 ports on
242 one machine. You'll have to increase the number of boards in sx.h
243 if you want more than 4 boards. */
244
245 #ifndef PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8
246 #define PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8 0x2000
247 #endif
248
249 /* Configurable options:
250 (Don't be too sure that it'll work if you toggle them) */
251
252 /* Am I paranoid or not ? ;-) */
253 #undef SX_PARANOIA_CHECK
254
255 /* 20 -> 2000 per second. The card should rate-limit interrupts at 100
256 Hz, but it is user configurable. I don't recommend going above 1000
257 Hz. The interrupt ratelimit might trigger if the interrupt is
258 shared with a very active other device. */
259 #define IRQ_RATE_LIMIT 20
260
261 /* Sharing interrupts is possible now. If the other device wants more
262 than 2000 interrupts per second, we'd gracefully decline further
263 interrupts. That's not what we want. On the other hand, if the
264 other device interrupts 2000 times a second, don't use the SX
265 interrupt. Use polling. */
266 #undef IRQ_RATE_LIMIT
267
268 #if 0
269 /* Not implemented */
270 /*
271 * The following defines are mostly for testing purposes. But if you need
272 * some nice reporting in your syslog, you can define them also.
273 */
274 #define SX_REPORT_FIFO
275 #define SX_REPORT_OVERRUN
276 #endif
277
278 /* Function prototypes */
279 static void sx_disable_tx_interrupts(void *ptr);
280 static void sx_enable_tx_interrupts(void *ptr);
281 static void sx_disable_rx_interrupts(void *ptr);
282 static void sx_enable_rx_interrupts(void *ptr);
283 static int sx_carrier_raised(struct tty_port *port);
284 static void sx_shutdown_port(void *ptr);
285 static int sx_set_real_termios(void *ptr);
286 static void sx_close(void *ptr);
287 static int sx_chars_in_buffer(void *ptr);
288 static int sx_init_board(struct sx_board *board);
289 static int sx_init_portstructs(int nboards, int nports);
290 static long sx_fw_ioctl(struct file *filp, unsigned int cmd,
291 unsigned long arg);
292 static int sx_init_drivers(void);
293
294 static struct tty_driver *sx_driver;
295
296 static DEFINE_MUTEX(sx_boards_lock);
297 static struct sx_board boards[SX_NBOARDS];
298 static struct sx_port *sx_ports;
299 static int sx_initialized;
300 static int sx_nports;
301 static int sx_debug;
302
303 /* You can have the driver poll your card.
304 - Set sx_poll to 1 to poll every timer tick (10ms on Intel).
305 This is used when the card cannot use an interrupt for some reason.
306
307 - set sx_slowpoll to 100 to do an extra poll once a second (on Intel). If
308 the driver misses an interrupt (report this if it DOES happen to you!)
309 everything will continue to work....
310 */
311 static int sx_poll = 1;
312 static int sx_slowpoll;
313
314 /* The card limits the number of interrupts per second.
315 At 115k2 "100" should be sufficient.
316 If you're using higher baudrates, you can increase this...
317 */
318
319 static int sx_maxints = 100;
320
321 #ifdef CONFIG_ISA
322
323 /* These are the only open spaces in my computer. Yours may have more
324 or less.... -- REW
325 duh: Card at 0xa0000 is possible on HP Netserver?? -- pvdl
326 */
327 static int sx_probe_addrs[] = {
328 0xc0000, 0xd0000, 0xe0000,
329 0xc8000, 0xd8000, 0xe8000
330 };
331 static int si_probe_addrs[] = {
332 0xc0000, 0xd0000, 0xe0000,
333 0xc8000, 0xd8000, 0xe8000, 0xa0000
334 };
335 static int si1_probe_addrs[] = {
336 0xd0000
337 };
338
339 #define NR_SX_ADDRS ARRAY_SIZE(sx_probe_addrs)
340 #define NR_SI_ADDRS ARRAY_SIZE(si_probe_addrs)
341 #define NR_SI1_ADDRS ARRAY_SIZE(si1_probe_addrs)
342
343 module_param_array(sx_probe_addrs, int, NULL, 0);
344 module_param_array(si_probe_addrs, int, NULL, 0);
345 #endif
346
347 /* Set the mask to all-ones. This alas, only supports 32 interrupts.
348 Some architectures may need more. */
349 static int sx_irqmask = -1;
350
351 module_param(sx_poll, int, 0);
352 module_param(sx_slowpoll, int, 0);
353 module_param(sx_maxints, int, 0);
354 module_param(sx_debug, int, 0);
355 module_param(sx_irqmask, int, 0);
356
357 MODULE_LICENSE("GPL");
358
359 static struct real_driver sx_real_driver = {
360 sx_disable_tx_interrupts,
361 sx_enable_tx_interrupts,
362 sx_disable_rx_interrupts,
363 sx_enable_rx_interrupts,
364 sx_shutdown_port,
365 sx_set_real_termios,
366 sx_chars_in_buffer,
367 sx_close,
368 };
369
370 /*
371 This driver can spew a whole lot of debugging output at you. If you
372 need maximum performance, you should disable the DEBUG define. To
373 aid in debugging in the field, I'm leaving the compile-time debug
374 features enabled, and disable them "runtime". That allows me to
375 instruct people with problems to enable debugging without requiring
376 them to recompile...
377 */
378 #define DEBUG
379
380 #ifdef DEBUG
381 #define sx_dprintk(f, str...) if (sx_debug & f) printk (str)
382 #else
383 #define sx_dprintk(f, str...) /* nothing */
384 #endif
385
386 #define func_enter() sx_dprintk(SX_DEBUG_FLOW, "sx: enter %s\n",__func__)
387 #define func_exit() sx_dprintk(SX_DEBUG_FLOW, "sx: exit %s\n",__func__)
388
389 #define func_enter2() sx_dprintk(SX_DEBUG_FLOW, "sx: enter %s (port %d)\n", \
390 __func__, port->line)
391
392 /*
393 * Firmware loader driver specific routines
394 *
395 */
396
397 static const struct file_operations sx_fw_fops = {
398 .owner = THIS_MODULE,
399 .unlocked_ioctl = sx_fw_ioctl,
400 };
401
402 static struct miscdevice sx_fw_device = {
403 SXCTL_MISC_MINOR, "sxctl", &sx_fw_fops
404 };
405
406 #ifdef SX_PARANOIA_CHECK
407
408 /* This doesn't work. Who's paranoid around here? Not me! */
409
410 static inline int sx_paranoia_check(struct sx_port const *port,
411 char *name, const char *routine)
412 {
413 static const char *badmagic = KERN_ERR "sx: Warning: bad sx port magic "
414 "number for device %s in %s\n";
415 static const char *badinfo = KERN_ERR "sx: Warning: null sx port for "
416 "device %s in %s\n";
417
418 if (!port) {
419 printk(badinfo, name, routine);
420 return 1;
421 }
422 if (port->magic != SX_MAGIC) {
423 printk(badmagic, name, routine);
424 return 1;
425 }
426
427 return 0;
428 }
429 #else
430 #define sx_paranoia_check(a,b,c) 0
431 #endif
432
433 /* The timeouts. First try 30 times as fast as possible. Then give
434 the card some time to breathe between accesses. (Otherwise the
435 processor on the card might not be able to access its OWN bus... */
436
437 #define TIMEOUT_1 30
438 #define TIMEOUT_2 1000000
439
440 #ifdef DEBUG
441 static void my_hd_io(void __iomem *p, int len)
442 {
443 int i, j, ch;
444 unsigned char __iomem *addr = p;
445
446 for (i = 0; i < len; i += 16) {
447 printk("%p ", addr + i);
448 for (j = 0; j < 16; j++) {
449 printk("%02x %s", readb(addr + j + i),
450 (j == 7) ? " " : "");
451 }
452 for (j = 0; j < 16; j++) {
453 ch = readb(addr + j + i);
454 printk("%c", (ch < 0x20) ? '.' :
455 ((ch > 0x7f) ? '.' : ch));
456 }
457 printk("\n");
458 }
459 }
460 static void my_hd(void *p, int len)
461 {
462 int i, j, ch;
463 unsigned char *addr = p;
464
465 for (i = 0; i < len; i += 16) {
466 printk("%p ", addr + i);
467 for (j = 0; j < 16; j++) {
468 printk("%02x %s", addr[j + i], (j == 7) ? " " : "");
469 }
470 for (j = 0; j < 16; j++) {
471 ch = addr[j + i];
472 printk("%c", (ch < 0x20) ? '.' :
473 ((ch > 0x7f) ? '.' : ch));
474 }
475 printk("\n");
476 }
477 }
478 #endif
479
480 /* This needs redoing for Alpha -- REW -- Done. */
481
482 static inline void write_sx_byte(struct sx_board *board, int offset, u8 byte)
483 {
484 writeb(byte, board->base + offset);
485 }
486
487 static inline u8 read_sx_byte(struct sx_board *board, int offset)
488 {
489 return readb(board->base + offset);
490 }
491
492 static inline void write_sx_word(struct sx_board *board, int offset, u16 word)
493 {
494 writew(word, board->base + offset);
495 }
496
497 static inline u16 read_sx_word(struct sx_board *board, int offset)
498 {
499 return readw(board->base + offset);
500 }
501
502 static int sx_busy_wait_eq(struct sx_board *board,
503 int offset, int mask, int correctval)
504 {
505 int i;
506
507 func_enter();
508
509 for (i = 0; i < TIMEOUT_1; i++)
510 if ((read_sx_byte(board, offset) & mask) == correctval) {
511 func_exit();
512 return 1;
513 }
514
515 for (i = 0; i < TIMEOUT_2; i++) {
516 if ((read_sx_byte(board, offset) & mask) == correctval) {
517 func_exit();
518 return 1;
519 }
520 udelay(1);
521 }
522
523 func_exit();
524 return 0;
525 }
526
527 static int sx_busy_wait_neq(struct sx_board *board,
528 int offset, int mask, int badval)
529 {
530 int i;
531
532 func_enter();
533
534 for (i = 0; i < TIMEOUT_1; i++)
535 if ((read_sx_byte(board, offset) & mask) != badval) {
536 func_exit();
537 return 1;
538 }
539
540 for (i = 0; i < TIMEOUT_2; i++) {
541 if ((read_sx_byte(board, offset) & mask) != badval) {
542 func_exit();
543 return 1;
544 }
545 udelay(1);
546 }
547
548 func_exit();
549 return 0;
550 }
551
552 /* 5.6.4 of 6210028 r2.3 */
553 static int sx_reset(struct sx_board *board)
554 {
555 func_enter();
556
557 if (IS_SX_BOARD(board)) {
558
559 write_sx_byte(board, SX_CONFIG, 0);
560 write_sx_byte(board, SX_RESET, 1); /* Value doesn't matter */
561
562 if (!sx_busy_wait_eq(board, SX_RESET_STATUS, 1, 0)) {
563 printk(KERN_INFO "sx: Card doesn't respond to "
564 "reset...\n");
565 return 0;
566 }
567 } else if (IS_EISA_BOARD(board)) {
568 outb(board->irq << 4, board->eisa_base + 0xc02);
569 } else if (IS_SI1_BOARD(board)) {
570 write_sx_byte(board, SI1_ISA_RESET, 0); /*value doesn't matter*/
571 } else {
572 /* Gory details of the SI/ISA board */
573 write_sx_byte(board, SI2_ISA_RESET, SI2_ISA_RESET_SET);
574 write_sx_byte(board, SI2_ISA_IRQ11, SI2_ISA_IRQ11_CLEAR);
575 write_sx_byte(board, SI2_ISA_IRQ12, SI2_ISA_IRQ12_CLEAR);
576 write_sx_byte(board, SI2_ISA_IRQ15, SI2_ISA_IRQ15_CLEAR);
577 write_sx_byte(board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_CLEAR);
578 write_sx_byte(board, SI2_ISA_IRQSET, SI2_ISA_IRQSET_CLEAR);
579 }
580
581 func_exit();
582 return 1;
583 }
584
585 /* This doesn't work on machines where "NULL" isn't 0 */
586 /* If you have one of those, someone will need to write
587 the equivalent of this, which will amount to about 3 lines. I don't
588 want to complicate this right now. -- REW
589 (See, I do write comments every now and then :-) */
590 #define OFFSETOF(strct, elem) ((long)&(((struct strct *)NULL)->elem))
591
592 #define CHAN_OFFSET(port,elem) (port->ch_base + OFFSETOF (_SXCHANNEL, elem))
593 #define MODU_OFFSET(board,addr,elem) (addr + OFFSETOF (_SXMODULE, elem))
594 #define BRD_OFFSET(board,elem) (OFFSETOF (_SXCARD, elem))
595
596 #define sx_write_channel_byte(port, elem, val) \
597 write_sx_byte (port->board, CHAN_OFFSET (port, elem), val)
598
599 #define sx_read_channel_byte(port, elem) \
600 read_sx_byte (port->board, CHAN_OFFSET (port, elem))
601
602 #define sx_write_channel_word(port, elem, val) \
603 write_sx_word (port->board, CHAN_OFFSET (port, elem), val)
604
605 #define sx_read_channel_word(port, elem) \
606 read_sx_word (port->board, CHAN_OFFSET (port, elem))
607
608 #define sx_write_module_byte(board, addr, elem, val) \
609 write_sx_byte (board, MODU_OFFSET (board, addr, elem), val)
610
611 #define sx_read_module_byte(board, addr, elem) \
612 read_sx_byte (board, MODU_OFFSET (board, addr, elem))
613
614 #define sx_write_module_word(board, addr, elem, val) \
615 write_sx_word (board, MODU_OFFSET (board, addr, elem), val)
616
617 #define sx_read_module_word(board, addr, elem) \
618 read_sx_word (board, MODU_OFFSET (board, addr, elem))
619
620 #define sx_write_board_byte(board, elem, val) \
621 write_sx_byte (board, BRD_OFFSET (board, elem), val)
622
623 #define sx_read_board_byte(board, elem) \
624 read_sx_byte (board, BRD_OFFSET (board, elem))
625
626 #define sx_write_board_word(board, elem, val) \
627 write_sx_word (board, BRD_OFFSET (board, elem), val)
628
629 #define sx_read_board_word(board, elem) \
630 read_sx_word (board, BRD_OFFSET (board, elem))
631
632 static int sx_start_board(struct sx_board *board)
633 {
634 if (IS_SX_BOARD(board)) {
635 write_sx_byte(board, SX_CONFIG, SX_CONF_BUSEN);
636 } else if (IS_EISA_BOARD(board)) {
637 write_sx_byte(board, SI2_EISA_OFF, SI2_EISA_VAL);
638 outb((board->irq << 4) | 4, board->eisa_base + 0xc02);
639 } else if (IS_SI1_BOARD(board)) {
640 write_sx_byte(board, SI1_ISA_RESET_CLEAR, 0);
641 write_sx_byte(board, SI1_ISA_INTCL, 0);
642 } else {
643 /* Don't bug me about the clear_set.
644 I haven't the foggiest idea what it's about -- REW */
645 write_sx_byte(board, SI2_ISA_RESET, SI2_ISA_RESET_CLEAR);
646 write_sx_byte(board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
647 }
648 return 1;
649 }
650
651 #define SX_IRQ_REG_VAL(board) \
652 ((board->flags & SX_ISA_BOARD) ? (board->irq << 4) : 0)
653
654 /* Note. The SX register is write-only. Therefore, we have to enable the
655 bus too. This is a no-op, if you don't mess with this driver... */
656 static int sx_start_interrupts(struct sx_board *board)
657 {
658
659 /* Don't call this with board->irq == 0 */
660
661 if (IS_SX_BOARD(board)) {
662 write_sx_byte(board, SX_CONFIG, SX_IRQ_REG_VAL(board) |
663 SX_CONF_BUSEN | SX_CONF_HOSTIRQ);
664 } else if (IS_EISA_BOARD(board)) {
665 inb(board->eisa_base + 0xc03);
666 } else if (IS_SI1_BOARD(board)) {
667 write_sx_byte(board, SI1_ISA_INTCL, 0);
668 write_sx_byte(board, SI1_ISA_INTCL_CLEAR, 0);
669 } else {
670 switch (board->irq) {
671 case 11:
672 write_sx_byte(board, SI2_ISA_IRQ11, SI2_ISA_IRQ11_SET);
673 break;
674 case 12:
675 write_sx_byte(board, SI2_ISA_IRQ12, SI2_ISA_IRQ12_SET);
676 break;
677 case 15:
678 write_sx_byte(board, SI2_ISA_IRQ15, SI2_ISA_IRQ15_SET);
679 break;
680 default:
681 printk(KERN_INFO "sx: SI/XIO card doesn't support "
682 "interrupt %d.\n", board->irq);
683 return 0;
684 }
685 write_sx_byte(board, SI2_ISA_INTCLEAR, SI2_ISA_INTCLEAR_SET);
686 }
687
688 return 1;
689 }
690
691 static int sx_send_command(struct sx_port *port,
692 int command, int mask, int newstat)
693 {
694 func_enter2();
695 write_sx_byte(port->board, CHAN_OFFSET(port, hi_hstat), command);
696 func_exit();
697 return sx_busy_wait_eq(port->board, CHAN_OFFSET(port, hi_hstat), mask,
698 newstat);
699 }
700
701 static char *mod_type_s(int module_type)
702 {
703 switch (module_type) {
704 case TA4:
705 return "TA4";
706 case TA8:
707 return "TA8";
708 case TA4_ASIC:
709 return "TA4_ASIC";
710 case TA8_ASIC:
711 return "TA8_ASIC";
712 case MTA_CD1400:
713 return "MTA_CD1400";
714 case SXDC:
715 return "SXDC";
716 default:
717 return "Unknown/invalid";
718 }
719 }
720
721 static char *pan_type_s(int pan_type)
722 {
723 switch (pan_type) {
724 case MOD_RS232DB25:
725 return "MOD_RS232DB25";
726 case MOD_RS232RJ45:
727 return "MOD_RS232RJ45";
728 case MOD_RS422DB25:
729 return "MOD_RS422DB25";
730 case MOD_PARALLEL:
731 return "MOD_PARALLEL";
732 case MOD_2_RS232DB25:
733 return "MOD_2_RS232DB25";
734 case MOD_2_RS232RJ45:
735 return "MOD_2_RS232RJ45";
736 case MOD_2_RS422DB25:
737 return "MOD_2_RS422DB25";
738 case MOD_RS232DB25MALE:
739 return "MOD_RS232DB25MALE";
740 case MOD_2_PARALLEL:
741 return "MOD_2_PARALLEL";
742 case MOD_BLANK:
743 return "empty";
744 default:
745 return "invalid";
746 }
747 }
748
749 static int mod_compat_type(int module_type)
750 {
751 return module_type >> 4;
752 }
753
754 static void sx_reconfigure_port(struct sx_port *port)
755 {
756 if (sx_read_channel_byte(port, hi_hstat) == HS_IDLE_OPEN) {
757 if (sx_send_command(port, HS_CONFIG, -1, HS_IDLE_OPEN) != 1) {
758 printk(KERN_WARNING "sx: Sent reconfigure command, but "
759 "card didn't react.\n");
760 }
761 } else {
762 sx_dprintk(SX_DEBUG_TERMIOS, "sx: Not sending reconfigure: "
763 "port isn't open (%02x).\n",
764 sx_read_channel_byte(port, hi_hstat));
765 }
766 }
767
768 static void sx_setsignals(struct sx_port *port, int dtr, int rts)
769 {
770 int t;
771 func_enter2();
772
773 t = sx_read_channel_byte(port, hi_op);
774 if (dtr >= 0)
775 t = dtr ? (t | OP_DTR) : (t & ~OP_DTR);
776 if (rts >= 0)
777 t = rts ? (t | OP_RTS) : (t & ~OP_RTS);
778 sx_write_channel_byte(port, hi_op, t);
779 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "setsignals: %d/%d\n", dtr, rts);
780
781 func_exit();
782 }
783
784 static int sx_getsignals(struct sx_port *port)
785 {
786 int i_stat, o_stat;
787
788 o_stat = sx_read_channel_byte(port, hi_op);
789 i_stat = sx_read_channel_byte(port, hi_ip);
790
791 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "getsignals: %d/%d (%d/%d) "
792 "%02x/%02x\n",
793 (o_stat & OP_DTR) != 0, (o_stat & OP_RTS) != 0,
794 port->c_dcd, tty_port_carrier_raised(&port->gs.port),
795 sx_read_channel_byte(port, hi_ip),
796 sx_read_channel_byte(port, hi_state));
797
798 return (((o_stat & OP_DTR) ? TIOCM_DTR : 0) |
799 ((o_stat & OP_RTS) ? TIOCM_RTS : 0) |
800 ((i_stat & IP_CTS) ? TIOCM_CTS : 0) |
801 ((i_stat & IP_DCD) ? TIOCM_CAR : 0) |
802 ((i_stat & IP_DSR) ? TIOCM_DSR : 0) |
803 ((i_stat & IP_RI) ? TIOCM_RNG : 0));
804 }
805
806 static void sx_set_baud(struct sx_port *port)
807 {
808 int t;
809
810 if (port->board->ta_type == MOD_SXDC) {
811 switch (port->gs.baud) {
812 /* Save some typing work... */
813 #define e(x) case x: t = BAUD_ ## x; break
814 e(50);
815 e(75);
816 e(110);
817 e(150);
818 e(200);
819 e(300);
820 e(600);
821 e(1200);
822 e(1800);
823 e(2000);
824 e(2400);
825 e(4800);
826 e(7200);
827 e(9600);
828 e(14400);
829 e(19200);
830 e(28800);
831 e(38400);
832 e(56000);
833 e(57600);
834 e(64000);
835 e(76800);
836 e(115200);
837 e(128000);
838 e(150000);
839 e(230400);
840 e(256000);
841 e(460800);
842 e(921600);
843 case 134:
844 t = BAUD_134_5;
845 break;
846 case 0:
847 t = -1;
848 break;
849 default:
850 /* Can I return "invalid"? */
851 t = BAUD_9600;
852 printk(KERN_INFO "sx: unsupported baud rate: %d.\n",
853 port->gs.baud);
854 break;
855 }
856 #undef e
857 if (t > 0) {
858 /* The baud rate is not set to 0, so we're enabeling DTR... -- REW */
859 sx_setsignals(port, 1, -1);
860 /* XXX This is not TA & MTA compatible */
861 sx_write_channel_byte(port, hi_csr, 0xff);
862
863 sx_write_channel_byte(port, hi_txbaud, t);
864 sx_write_channel_byte(port, hi_rxbaud, t);
865 } else {
866 sx_setsignals(port, 0, -1);
867 }
868 } else {
869 switch (port->gs.baud) {
870 #define e(x) case x: t = CSR_ ## x; break
871 e(75);
872 e(150);
873 e(300);
874 e(600);
875 e(1200);
876 e(2400);
877 e(4800);
878 e(1800);
879 e(9600);
880 e(19200);
881 e(57600);
882 e(38400);
883 /* TA supports 110, but not 115200, MTA supports 115200, but not 110 */
884 case 110:
885 if (port->board->ta_type == MOD_TA) {
886 t = CSR_110;
887 break;
888 } else {
889 t = CSR_9600;
890 printk(KERN_INFO "sx: Unsupported baud rate: "
891 "%d.\n", port->gs.baud);
892 break;
893 }
894 case 115200:
895 if (port->board->ta_type == MOD_TA) {
896 t = CSR_9600;
897 printk(KERN_INFO "sx: Unsupported baud rate: "
898 "%d.\n", port->gs.baud);
899 break;
900 } else {
901 t = CSR_110;
902 break;
903 }
904 case 0:
905 t = -1;
906 break;
907 default:
908 t = CSR_9600;
909 printk(KERN_INFO "sx: Unsupported baud rate: %d.\n",
910 port->gs.baud);
911 break;
912 }
913 #undef e
914 if (t >= 0) {
915 sx_setsignals(port, 1, -1);
916 sx_write_channel_byte(port, hi_csr, t * 0x11);
917 } else {
918 sx_setsignals(port, 0, -1);
919 }
920 }
921 }
922
923 /* Simon Allen's version of this routine was 225 lines long. 85 is a lot
924 better. -- REW */
925
926 static int sx_set_real_termios(void *ptr)
927 {
928 struct sx_port *port = ptr;
929
930 func_enter2();
931
932 if (!port->gs.port.tty)
933 return 0;
934
935 /* What is this doing here? -- REW
936 Ha! figured it out. It is to allow you to get DTR active again
937 if you've dropped it with stty 0. Moved to set_baud, where it
938 belongs (next to the drop dtr if baud == 0) -- REW */
939 /* sx_setsignals (port, 1, -1); */
940
941 sx_set_baud(port);
942
943 #define CFLAG port->gs.port.tty->termios->c_cflag
944 sx_write_channel_byte(port, hi_mr1,
945 (C_PARENB(port->gs.port.tty) ? MR1_WITH : MR1_NONE) |
946 (C_PARODD(port->gs.port.tty) ? MR1_ODD : MR1_EVEN) |
947 (C_CRTSCTS(port->gs.port.tty) ? MR1_RTS_RXFLOW : 0) |
948 (((CFLAG & CSIZE) == CS8) ? MR1_8_BITS : 0) |
949 (((CFLAG & CSIZE) == CS7) ? MR1_7_BITS : 0) |
950 (((CFLAG & CSIZE) == CS6) ? MR1_6_BITS : 0) |
951 (((CFLAG & CSIZE) == CS5) ? MR1_5_BITS : 0));
952
953 sx_write_channel_byte(port, hi_mr2,
954 (C_CRTSCTS(port->gs.port.tty) ? MR2_CTS_TXFLOW : 0) |
955 (C_CSTOPB(port->gs.port.tty) ? MR2_2_STOP :
956 MR2_1_STOP));
957
958 switch (CFLAG & CSIZE) {
959 case CS8:
960 sx_write_channel_byte(port, hi_mask, 0xff);
961 break;
962 case CS7:
963 sx_write_channel_byte(port, hi_mask, 0x7f);
964 break;
965 case CS6:
966 sx_write_channel_byte(port, hi_mask, 0x3f);
967 break;
968 case CS5:
969 sx_write_channel_byte(port, hi_mask, 0x1f);
970 break;
971 default:
972 printk(KERN_INFO "sx: Invalid wordsize: %u\n",
973 (unsigned int)CFLAG & CSIZE);
974 break;
975 }
976
977 sx_write_channel_byte(port, hi_prtcl,
978 (I_IXON(port->gs.port.tty) ? SP_TXEN : 0) |
979 (I_IXOFF(port->gs.port.tty) ? SP_RXEN : 0) |
980 (I_IXANY(port->gs.port.tty) ? SP_TANY : 0) | SP_DCEN);
981
982 sx_write_channel_byte(port, hi_break,
983 (I_IGNBRK(port->gs.port.tty) ? BR_IGN : 0 |
984 I_BRKINT(port->gs.port.tty) ? BR_INT : 0));
985
986 sx_write_channel_byte(port, hi_txon, START_CHAR(port->gs.port.tty));
987 sx_write_channel_byte(port, hi_rxon, START_CHAR(port->gs.port.tty));
988 sx_write_channel_byte(port, hi_txoff, STOP_CHAR(port->gs.port.tty));
989 sx_write_channel_byte(port, hi_rxoff, STOP_CHAR(port->gs.port.tty));
990
991 sx_reconfigure_port(port);
992
993 /* Tell line discipline whether we will do input cooking */
994 if (I_OTHER(port->gs.port.tty)) {
995 clear_bit(TTY_HW_COOK_IN, &port->gs.port.tty->flags);
996 } else {
997 set_bit(TTY_HW_COOK_IN, &port->gs.port.tty->flags);
998 }
999 sx_dprintk(SX_DEBUG_TERMIOS, "iflags: %x(%d) ",
1000 (unsigned int)port->gs.port.tty->termios->c_iflag,
1001 I_OTHER(port->gs.port.tty));
1002
1003 /* Tell line discipline whether we will do output cooking.
1004 * If OPOST is set and no other output flags are set then we can do output
1005 * processing. Even if only *one* other flag in the O_OTHER group is set
1006 * we do cooking in software.
1007 */
1008 if (O_OPOST(port->gs.port.tty) && !O_OTHER(port->gs.port.tty)) {
1009 set_bit(TTY_HW_COOK_OUT, &port->gs.port.tty->flags);
1010 } else {
1011 clear_bit(TTY_HW_COOK_OUT, &port->gs.port.tty->flags);
1012 }
1013 sx_dprintk(SX_DEBUG_TERMIOS, "oflags: %x(%d)\n",
1014 (unsigned int)port->gs.port.tty->termios->c_oflag,
1015 O_OTHER(port->gs.port.tty));
1016 /* port->c_dcd = sx_get_CD (port); */
1017 func_exit();
1018 return 0;
1019 }
1020
1021 /* ********************************************************************** *
1022 * the interrupt related routines *
1023 * ********************************************************************** */
1024
1025 /* Note:
1026 Other drivers use the macro "MIN" to calculate how much to copy.
1027 This has the disadvantage that it will evaluate parts twice. That's
1028 expensive when it's IO (and the compiler cannot optimize those away!).
1029 Moreover, I'm not sure that you're race-free.
1030
1031 I assign a value, and then only allow the value to decrease. This
1032 is always safe. This makes the code a few lines longer, and you
1033 know I'm dead against that, but I think it is required in this
1034 case. */
1035
1036 static void sx_transmit_chars(struct sx_port *port)
1037 {
1038 int c;
1039 int tx_ip;
1040 int txroom;
1041
1042 func_enter2();
1043 sx_dprintk(SX_DEBUG_TRANSMIT, "Port %p: transmit %d chars\n",
1044 port, port->gs.xmit_cnt);
1045
1046 if (test_and_set_bit(SX_PORT_TRANSMIT_LOCK, &port->locks)) {
1047 return;
1048 }
1049
1050 while (1) {
1051 c = port->gs.xmit_cnt;
1052
1053 sx_dprintk(SX_DEBUG_TRANSMIT, "Copying %d ", c);
1054 tx_ip = sx_read_channel_byte(port, hi_txipos);
1055
1056 /* Took me 5 minutes to deduce this formula.
1057 Luckily it is literally in the manual in section 6.5.4.3.5 */
1058 txroom = (sx_read_channel_byte(port, hi_txopos) - tx_ip - 1) &
1059 0xff;
1060
1061 /* Don't copy more bytes than there is room for in the buffer */
1062 if (c > txroom)
1063 c = txroom;
1064 sx_dprintk(SX_DEBUG_TRANSMIT, " %d(%d) ", c, txroom);
1065
1066 /* Don't copy past the end of the hardware transmit buffer */
1067 if (c > 0x100 - tx_ip)
1068 c = 0x100 - tx_ip;
1069
1070 sx_dprintk(SX_DEBUG_TRANSMIT, " %d(%d) ", c, 0x100 - tx_ip);
1071
1072 /* Don't copy pas the end of the source buffer */
1073 if (c > SERIAL_XMIT_SIZE - port->gs.xmit_tail)
1074 c = SERIAL_XMIT_SIZE - port->gs.xmit_tail;
1075
1076 sx_dprintk(SX_DEBUG_TRANSMIT, " %d(%ld) \n",
1077 c, SERIAL_XMIT_SIZE - port->gs.xmit_tail);
1078
1079 /* If for one reason or another, we can't copy more data, we're
1080 done! */
1081 if (c == 0)
1082 break;
1083
1084 memcpy_toio(port->board->base + CHAN_OFFSET(port, hi_txbuf) +
1085 tx_ip, port->gs.xmit_buf + port->gs.xmit_tail, c);
1086
1087 /* Update the pointer in the card */
1088 sx_write_channel_byte(port, hi_txipos, (tx_ip + c) & 0xff);
1089
1090 /* Update the kernel buffer end */
1091 port->gs.xmit_tail = (port->gs.xmit_tail + c) &
1092 (SERIAL_XMIT_SIZE - 1);
1093
1094 /* This one last. (this is essential)
1095 It would allow others to start putting more data into the
1096 buffer! */
1097 port->gs.xmit_cnt -= c;
1098 }
1099
1100 if (port->gs.xmit_cnt == 0) {
1101 sx_disable_tx_interrupts(port);
1102 }
1103
1104 if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.port.tty) {
1105 tty_wakeup(port->gs.port.tty);
1106 sx_dprintk(SX_DEBUG_TRANSMIT, "Waking up.... ldisc (%d)....\n",
1107 port->gs.wakeup_chars);
1108 }
1109
1110 clear_bit(SX_PORT_TRANSMIT_LOCK, &port->locks);
1111 func_exit();
1112 }
1113
1114 /* Note the symmetry between receiving chars and transmitting them!
1115 Note: The kernel should have implemented both a receive buffer and
1116 a transmit buffer. */
1117
1118 /* Inlined: Called only once. Remove the inline when you add another call */
1119 static inline void sx_receive_chars(struct sx_port *port)
1120 {
1121 int c;
1122 int rx_op;
1123 struct tty_struct *tty;
1124 int copied = 0;
1125 unsigned char *rp;
1126
1127 func_enter2();
1128 tty = port->gs.port.tty;
1129 while (1) {
1130 rx_op = sx_read_channel_byte(port, hi_rxopos);
1131 c = (sx_read_channel_byte(port, hi_rxipos) - rx_op) & 0xff;
1132
1133 sx_dprintk(SX_DEBUG_RECEIVE, "rxop=%d, c = %d.\n", rx_op, c);
1134
1135 /* Don't copy past the end of the hardware receive buffer */
1136 if (rx_op + c > 0x100)
1137 c = 0x100 - rx_op;
1138
1139 sx_dprintk(SX_DEBUG_RECEIVE, "c = %d.\n", c);
1140
1141 /* Don't copy more bytes than there is room for in the buffer */
1142
1143 c = tty_prepare_flip_string(tty, &rp, c);
1144
1145 sx_dprintk(SX_DEBUG_RECEIVE, "c = %d.\n", c);
1146
1147 /* If for one reason or another, we can't copy more data, we're done! */
1148 if (c == 0)
1149 break;
1150
1151 sx_dprintk(SX_DEBUG_RECEIVE, "Copying over %d chars. First is "
1152 "%d at %lx\n", c, read_sx_byte(port->board,
1153 CHAN_OFFSET(port, hi_rxbuf) + rx_op),
1154 CHAN_OFFSET(port, hi_rxbuf));
1155 memcpy_fromio(rp, port->board->base +
1156 CHAN_OFFSET(port, hi_rxbuf) + rx_op, c);
1157
1158 /* This one last. ( Not essential.)
1159 It allows the card to start putting more data into the
1160 buffer!
1161 Update the pointer in the card */
1162 sx_write_channel_byte(port, hi_rxopos, (rx_op + c) & 0xff);
1163
1164 copied += c;
1165 }
1166 if (copied) {
1167 struct timeval tv;
1168
1169 do_gettimeofday(&tv);
1170 sx_dprintk(SX_DEBUG_RECEIVE, "pushing flipq port %d (%3d "
1171 "chars): %d.%06d (%d/%d)\n", port->line,
1172 copied, (int)(tv.tv_sec % 60), (int)tv.tv_usec,
1173 tty->raw, tty->real_raw);
1174
1175 /* Tell the rest of the system the news. Great news. New
1176 characters! */
1177 tty_flip_buffer_push(tty);
1178 /* tty_schedule_flip (tty); */
1179 }
1180
1181 func_exit();
1182 }
1183
1184 /* Inlined: it is called only once. Remove the inline if you add another
1185 call */
1186 static inline void sx_check_modem_signals(struct sx_port *port)
1187 {
1188 int hi_state;
1189 int c_dcd;
1190
1191 hi_state = sx_read_channel_byte(port, hi_state);
1192 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "Checking modem signals (%d/%d)\n",
1193 port->c_dcd, tty_port_carrier_raised(&port->gs.port));
1194
1195 if (hi_state & ST_BREAK) {
1196 hi_state &= ~ST_BREAK;
1197 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "got a break.\n");
1198 sx_write_channel_byte(port, hi_state, hi_state);
1199 gs_got_break(&port->gs);
1200 }
1201 if (hi_state & ST_DCD) {
1202 hi_state &= ~ST_DCD;
1203 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "got a DCD change.\n");
1204 sx_write_channel_byte(port, hi_state, hi_state);
1205 c_dcd = tty_port_carrier_raised(&port->gs.port);
1206 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "DCD is now %d\n", c_dcd);
1207 if (c_dcd != port->c_dcd) {
1208 port->c_dcd = c_dcd;
1209 if (tty_port_carrier_raised(&port->gs.port)) {
1210 /* DCD went UP */
1211 if ((sx_read_channel_byte(port, hi_hstat) !=
1212 HS_IDLE_CLOSED) &&
1213 !(port->gs.port.tty->termios->
1214 c_cflag & CLOCAL)) {
1215 /* Are we blocking in open? */
1216 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "DCD "
1217 "active, unblocking open\n");
1218 wake_up_interruptible(&port->gs.port.
1219 open_wait);
1220 } else {
1221 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "DCD "
1222 "raised. Ignoring.\n");
1223 }
1224 } else {
1225 /* DCD went down! */
1226 if (!(port->gs.port.tty->termios->c_cflag & CLOCAL)){
1227 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "DCD "
1228 "dropped. hanging up....\n");
1229 tty_hangup(port->gs.port.tty);
1230 } else {
1231 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "DCD "
1232 "dropped. ignoring.\n");
1233 }
1234 }
1235 } else {
1236 sx_dprintk(SX_DEBUG_MODEMSIGNALS, "Hmmm. card told us "
1237 "DCD changed, but it didn't.\n");
1238 }
1239 }
1240 }
1241
1242 /* This is what an interrupt routine should look like.
1243 * Small, elegant, clear.
1244 */
1245
1246 static irqreturn_t sx_interrupt(int irq, void *ptr)
1247 {
1248 struct sx_board *board = ptr;
1249 struct sx_port *port;
1250 int i;
1251
1252 func_enter();
1253 sx_dprintk(SX_DEBUG_FLOW, "sx: enter sx_interrupt (%d/%d)\n", irq,
1254 board->irq);
1255
1256 /* AAargh! The order in which to do these things is essential and
1257 not trivial.
1258
1259 - Rate limit goes before "recursive". Otherwise a series of
1260 recursive calls will hang the machine in the interrupt routine.
1261
1262 - hardware twiddling goes before "recursive". Otherwise when we
1263 poll the card, and a recursive interrupt happens, we won't
1264 ack the card, so it might keep on interrupting us. (especially
1265 level sensitive interrupt systems like PCI).
1266
1267 - Rate limit goes before hardware twiddling. Otherwise we won't
1268 catch a card that has gone bonkers.
1269
1270 - The "initialized" test goes after the hardware twiddling. Otherwise
1271 the card will stick us in the interrupt routine again.
1272
1273 - The initialized test goes before recursive.
1274 */
1275
1276 #ifdef IRQ_RATE_LIMIT
1277 /* Aaargh! I'm ashamed. This costs more lines-of-code than the
1278 actual interrupt routine!. (Well, used to when I wrote that
1279 comment) */
1280 {
1281 static int lastjif;
1282 static int nintr = 0;
1283
1284 if (lastjif == jiffies) {
1285 if (++nintr > IRQ_RATE_LIMIT) {
1286 free_irq(board->irq, board);
1287 printk(KERN_ERR "sx: Too many interrupts. "
1288 "Turning off interrupt %d.\n",
1289 board->irq);
1290 }
1291 } else {
1292 lastjif = jiffies;
1293 nintr = 0;
1294 }
1295 }
1296 #endif
1297
1298 if (board->irq == irq) {
1299 /* Tell the card we've noticed the interrupt. */
1300
1301 sx_write_board_word(board, cc_int_pending, 0);
1302 if (IS_SX_BOARD(board)) {
1303 write_sx_byte(board, SX_RESET_IRQ, 1);
1304 } else if (IS_EISA_BOARD(board)) {
1305 inb(board->eisa_base + 0xc03);
1306 write_sx_word(board, 8, 0);
1307 } else {
1308 write_sx_byte(board, SI2_ISA_INTCLEAR,
1309 SI2_ISA_INTCLEAR_CLEAR);
1310 write_sx_byte(board, SI2_ISA_INTCLEAR,
1311 SI2_ISA_INTCLEAR_SET);
1312 }
1313 }
1314
1315 if (!sx_initialized)
1316 return IRQ_HANDLED;
1317 if (!(board->flags & SX_BOARD_INITIALIZED))
1318 return IRQ_HANDLED;
1319
1320 if (test_and_set_bit(SX_BOARD_INTR_LOCK, &board->locks)) {
1321 printk(KERN_ERR "Recursive interrupt! (%d)\n", board->irq);
1322 return IRQ_HANDLED;
1323 }
1324
1325 for (i = 0; i < board->nports; i++) {
1326 port = &board->ports[i];
1327 if (port->gs.port.flags & GS_ACTIVE) {
1328 if (sx_read_channel_byte(port, hi_state)) {
1329 sx_dprintk(SX_DEBUG_INTERRUPTS, "Port %d: "
1330 "modem signal change?... \n",i);
1331 sx_check_modem_signals(port);
1332 }
1333 if (port->gs.xmit_cnt) {
1334 sx_transmit_chars(port);
1335 }
1336 if (!(port->gs.port.flags & SX_RX_THROTTLE)) {
1337 sx_receive_chars(port);
1338 }
1339 }
1340 }
1341
1342 clear_bit(SX_BOARD_INTR_LOCK, &board->locks);
1343
1344 sx_dprintk(SX_DEBUG_FLOW, "sx: exit sx_interrupt (%d/%d)\n", irq,
1345 board->irq);
1346 func_exit();
1347 return IRQ_HANDLED;
1348 }
1349
1350 static void sx_pollfunc(unsigned long data)
1351 {
1352 struct sx_board *board = (struct sx_board *)data;
1353
1354 func_enter();
1355
1356 sx_interrupt(0, board);
1357
1358 mod_timer(&board->timer, jiffies + sx_poll);
1359 func_exit();
1360 }
1361
1362 /* ********************************************************************** *
1363 * Here are the routines that actually *
1364 * interface with the generic_serial driver *
1365 * ********************************************************************** */
1366
1367 /* Ehhm. I don't know how to fiddle with interrupts on the SX card. --REW */
1368 /* Hmm. Ok I figured it out. You don't. */
1369
1370 static void sx_disable_tx_interrupts(void *ptr)
1371 {
1372 struct sx_port *port = ptr;
1373 func_enter2();
1374
1375 port->gs.port.flags &= ~GS_TX_INTEN;
1376
1377 func_exit();
1378 }
1379
1380 static void sx_enable_tx_interrupts(void *ptr)
1381 {
1382 struct sx_port *port = ptr;
1383 int data_in_buffer;
1384 func_enter2();
1385
1386 /* First transmit the characters that we're supposed to */
1387 sx_transmit_chars(port);
1388
1389 /* The sx card will never interrupt us if we don't fill the buffer
1390 past 25%. So we keep considering interrupts off if that's the case. */
1391 data_in_buffer = (sx_read_channel_byte(port, hi_txipos) -
1392 sx_read_channel_byte(port, hi_txopos)) & 0xff;
1393
1394 /* XXX Must be "HIGH_WATER" for SI card according to doc. */
1395 if (data_in_buffer < LOW_WATER)
1396 port->gs.port.flags &= ~GS_TX_INTEN;
1397
1398 func_exit();
1399 }
1400
1401 static void sx_disable_rx_interrupts(void *ptr)
1402 {
1403 /* struct sx_port *port = ptr; */
1404 func_enter();
1405
1406 func_exit();
1407 }
1408
1409 static void sx_enable_rx_interrupts(void *ptr)
1410 {
1411 /* struct sx_port *port = ptr; */
1412 func_enter();
1413
1414 func_exit();
1415 }
1416
1417 /* Jeez. Isn't this simple? */
1418 static int sx_carrier_raised(struct tty_port *port)
1419 {
1420 struct sx_port *sp = container_of(port, struct sx_port, gs.port);
1421 return ((sx_read_channel_byte(sp, hi_ip) & IP_DCD) != 0);
1422 }
1423
1424 /* Jeez. Isn't this simple? */
1425 static int sx_chars_in_buffer(void *ptr)
1426 {
1427 struct sx_port *port = ptr;
1428 func_enter2();
1429
1430 func_exit();
1431 return ((sx_read_channel_byte(port, hi_txipos) -
1432 sx_read_channel_byte(port, hi_txopos)) & 0xff);
1433 }
1434
1435 static void sx_shutdown_port(void *ptr)
1436 {
1437 struct sx_port *port = ptr;
1438
1439 func_enter();
1440
1441 port->gs.port.flags &= ~GS_ACTIVE;
1442 if (port->gs.port.tty && (port->gs.port.tty->termios->c_cflag & HUPCL)) {
1443 sx_setsignals(port, 0, 0);
1444 sx_reconfigure_port(port);
1445 }
1446
1447 func_exit();
1448 }
1449
1450 /* ********************************************************************** *
1451 * Here are the routines that actually *
1452 * interface with the rest of the system *
1453 * ********************************************************************** */
1454
1455 static int sx_open(struct tty_struct *tty, struct file *filp)
1456 {
1457 struct sx_port *port;
1458 int retval, line;
1459 unsigned long flags;
1460
1461 func_enter();
1462
1463 if (!sx_initialized) {
1464 return -EIO;
1465 }
1466
1467 line = tty->index;
1468 sx_dprintk(SX_DEBUG_OPEN, "%d: opening line %d. tty=%p ctty=%p, "
1469 "np=%d)\n", task_pid_nr(current), line, tty,
1470 current->signal->tty, sx_nports);
1471
1472 if ((line < 0) || (line >= SX_NPORTS) || (line >= sx_nports))
1473 return -ENODEV;
1474
1475 port = &sx_ports[line];
1476 port->c_dcd = 0; /* Make sure that the first interrupt doesn't detect a
1477 1 -> 0 transition. */
1478
1479 sx_dprintk(SX_DEBUG_OPEN, "port = %p c_dcd = %d\n", port, port->c_dcd);
1480
1481 spin_lock_irqsave(&port->gs.driver_lock, flags);
1482
1483 tty->driver_data = port;
1484 port->gs.port.tty = tty;
1485 port->gs.port.count++;
1486 spin_unlock_irqrestore(&port->gs.driver_lock, flags);
1487
1488 sx_dprintk(SX_DEBUG_OPEN, "starting port\n");
1489
1490 /*
1491 * Start up serial port
1492 */
1493 retval = gs_init_port(&port->gs);
1494 sx_dprintk(SX_DEBUG_OPEN, "done gs_init\n");
1495 if (retval) {
1496 port->gs.port.count--;
1497 return retval;
1498 }
1499
1500 port->gs.port.flags |= GS_ACTIVE;
1501 if (port->gs.port.count <= 1)
1502 sx_setsignals(port, 1, 1);
1503
1504 #if 0
1505 if (sx_debug & SX_DEBUG_OPEN)
1506 my_hd(port, sizeof(*port));
1507 #else
1508 if (sx_debug & SX_DEBUG_OPEN)
1509 my_hd_io(port->board->base + port->ch_base, sizeof(*port));
1510 #endif
1511
1512 if (port->gs.port.count <= 1) {
1513 if (sx_send_command(port, HS_LOPEN, -1, HS_IDLE_OPEN) != 1) {
1514 printk(KERN_ERR "sx: Card didn't respond to LOPEN "
1515 "command.\n");
1516 spin_lock_irqsave(&port->gs.driver_lock, flags);
1517 port->gs.port.count--;
1518 spin_unlock_irqrestore(&port->gs.driver_lock, flags);
1519 return -EIO;
1520 }
1521 }
1522
1523 retval = gs_block_til_ready(port, filp);
1524 sx_dprintk(SX_DEBUG_OPEN, "Block til ready returned %d. Count=%d\n",
1525 retval, port->gs.port.count);
1526
1527 if (retval) {
1528 /*
1529 * Don't lower gs.port.count here because sx_close() will be called later
1530 */
1531
1532 return retval;
1533 }
1534 /* tty->low_latency = 1; */
1535
1536 port->c_dcd = sx_carrier_raised(&port->gs.port);
1537 sx_dprintk(SX_DEBUG_OPEN, "at open: cd=%d\n", port->c_dcd);
1538
1539 func_exit();
1540 return 0;
1541
1542 }
1543
1544 static void sx_close(void *ptr)
1545 {
1546 struct sx_port *port = ptr;
1547 /* Give the port 5 seconds to close down. */
1548 int to = 5 * HZ;
1549
1550 func_enter();
1551
1552 sx_setsignals(port, 0, 0);
1553 sx_reconfigure_port(port);
1554 sx_send_command(port, HS_CLOSE, 0, 0);
1555
1556 while (to-- && (sx_read_channel_byte(port, hi_hstat) != HS_IDLE_CLOSED))
1557 if (msleep_interruptible(10))
1558 break;
1559 if (sx_read_channel_byte(port, hi_hstat) != HS_IDLE_CLOSED) {
1560 if (sx_send_command(port, HS_FORCE_CLOSED, -1, HS_IDLE_CLOSED)
1561 != 1) {
1562 printk(KERN_ERR "sx: sent the force_close command, but "
1563 "card didn't react\n");
1564 } else
1565 sx_dprintk(SX_DEBUG_CLOSE, "sent the force_close "
1566 "command.\n");
1567 }
1568
1569 sx_dprintk(SX_DEBUG_CLOSE, "waited %d jiffies for close. count=%d\n",
1570 5 * HZ - to - 1, port->gs.port.count);
1571
1572 if (port->gs.port.count) {
1573 sx_dprintk(SX_DEBUG_CLOSE, "WARNING port count:%d\n",
1574 port->gs.port.count);
1575 /*printk("%s SETTING port count to zero: %p count: %d\n",
1576 __func__, port, port->gs.port.count);
1577 port->gs.port.count = 0;*/
1578 }
1579
1580 func_exit();
1581 }
1582
1583 /* This is relatively thorough. But then again it is only 20 lines. */
1584 #define MARCHUP for (i = min; i < max; i++)
1585 #define MARCHDOWN for (i = max - 1; i >= min; i--)
1586 #define W0 write_sx_byte(board, i, 0x55)
1587 #define W1 write_sx_byte(board, i, 0xaa)
1588 #define R0 if (read_sx_byte(board, i) != 0x55) return 1
1589 #define R1 if (read_sx_byte(board, i) != 0xaa) return 1
1590
1591 /* This memtest takes a human-noticable time. You normally only do it
1592 once a boot, so I guess that it is worth it. */
1593 static int do_memtest(struct sx_board *board, int min, int max)
1594 {
1595 int i;
1596
1597 /* This is a marchb. Theoretically, marchb catches much more than
1598 simpler tests. In practise, the longer test just catches more
1599 intermittent errors. -- REW
1600 (For the theory behind memory testing see:
1601 Testing Semiconductor Memories by A.J. van de Goor.) */
1602 MARCHUP {
1603 W0;
1604 }
1605 MARCHUP {
1606 R0;
1607 W1;
1608 R1;
1609 W0;
1610 R0;
1611 W1;
1612 }
1613 MARCHUP {
1614 R1;
1615 W0;
1616 W1;
1617 }
1618 MARCHDOWN {
1619 R1;
1620 W0;
1621 W1;
1622 W0;
1623 }
1624 MARCHDOWN {
1625 R0;
1626 W1;
1627 W0;
1628 }
1629
1630 return 0;
1631 }
1632
1633 #undef MARCHUP
1634 #undef MARCHDOWN
1635 #undef W0
1636 #undef W1
1637 #undef R0
1638 #undef R1
1639
1640 #define MARCHUP for (i = min; i < max; i += 2)
1641 #define MARCHDOWN for (i = max - 1; i >= min; i -= 2)
1642 #define W0 write_sx_word(board, i, 0x55aa)
1643 #define W1 write_sx_word(board, i, 0xaa55)
1644 #define R0 if (read_sx_word(board, i) != 0x55aa) return 1
1645 #define R1 if (read_sx_word(board, i) != 0xaa55) return 1
1646
1647 #if 0
1648 /* This memtest takes a human-noticable time. You normally only do it
1649 once a boot, so I guess that it is worth it. */
1650 static int do_memtest_w(struct sx_board *board, int min, int max)
1651 {
1652 int i;
1653
1654 MARCHUP {
1655 W0;
1656 }
1657 MARCHUP {
1658 R0;
1659 W1;
1660 R1;
1661 W0;
1662 R0;
1663 W1;
1664 }
1665 MARCHUP {
1666 R1;
1667 W0;
1668 W1;
1669 }
1670 MARCHDOWN {
1671 R1;
1672 W0;
1673 W1;
1674 W0;
1675 }
1676 MARCHDOWN {
1677 R0;
1678 W1;
1679 W0;
1680 }
1681
1682 return 0;
1683 }
1684 #endif
1685
1686 static long sx_fw_ioctl(struct file *filp, unsigned int cmd,
1687 unsigned long arg)
1688 {
1689 long rc = 0;
1690 int __user *descr = (int __user *)arg;
1691 int i;
1692 static struct sx_board *board = NULL;
1693 int nbytes, offset;
1694 unsigned long data;
1695 char *tmp;
1696
1697 func_enter();
1698
1699 if (!capable(CAP_SYS_RAWIO))
1700 return -EPERM;
1701
1702 lock_kernel();
1703
1704 sx_dprintk(SX_DEBUG_FIRMWARE, "IOCTL %x: %lx\n", cmd, arg);
1705
1706 if (!board)
1707 board = &boards[0];
1708 if (board->flags & SX_BOARD_PRESENT) {
1709 sx_dprintk(SX_DEBUG_FIRMWARE, "Board present! (%x)\n",
1710 board->flags);
1711 } else {
1712 sx_dprintk(SX_DEBUG_FIRMWARE, "Board not present! (%x) all:",
1713 board->flags);
1714 for (i = 0; i < SX_NBOARDS; i++)
1715 sx_dprintk(SX_DEBUG_FIRMWARE, "<%x> ", boards[i].flags);
1716 sx_dprintk(SX_DEBUG_FIRMWARE, "\n");
1717 rc = -EIO;
1718 goto out;
1719 }
1720
1721 switch (cmd) {
1722 case SXIO_SET_BOARD:
1723 sx_dprintk(SX_DEBUG_FIRMWARE, "set board to %ld\n", arg);
1724 rc = -EIO;
1725 if (arg >= SX_NBOARDS)
1726 break;
1727 sx_dprintk(SX_DEBUG_FIRMWARE, "not out of range\n");
1728 if (!(boards[arg].flags & SX_BOARD_PRESENT))
1729 break;
1730 sx_dprintk(SX_DEBUG_FIRMWARE, ".. and present!\n");
1731 board = &boards[arg];
1732 rc = 0;
1733 /* FIXME: And this does ... nothing?? */
1734 break;
1735 case SXIO_GET_TYPE:
1736 rc = -ENOENT; /* If we manage to miss one, return error. */
1737 if (IS_SX_BOARD(board))
1738 rc = SX_TYPE_SX;
1739 if (IS_CF_BOARD(board))
1740 rc = SX_TYPE_CF;
1741 if (IS_SI_BOARD(board))
1742 rc = SX_TYPE_SI;
1743 if (IS_SI1_BOARD(board))
1744 rc = SX_TYPE_SI;
1745 if (IS_EISA_BOARD(board))
1746 rc = SX_TYPE_SI;
1747 sx_dprintk(SX_DEBUG_FIRMWARE, "returning type= %ld\n", rc);
1748 break;
1749 case SXIO_DO_RAMTEST:
1750 if (sx_initialized) { /* Already initialized: better not ramtest the board. */
1751 rc = -EPERM;
1752 break;
1753 }
1754 if (IS_SX_BOARD(board)) {
1755 rc = do_memtest(board, 0, 0x7000);
1756 if (!rc)
1757 rc = do_memtest(board, 0, 0x7000);
1758 /*if (!rc) rc = do_memtest_w (board, 0, 0x7000); */
1759 } else {
1760 rc = do_memtest(board, 0, 0x7ff8);
1761 /* if (!rc) rc = do_memtest_w (board, 0, 0x7ff8); */
1762 }
1763 sx_dprintk(SX_DEBUG_FIRMWARE,
1764 "returning memtest result= %ld\n", rc);
1765 break;
1766 case SXIO_DOWNLOAD:
1767 if (sx_initialized) {/* Already initialized */
1768 rc = -EEXIST;
1769 break;
1770 }
1771 if (!sx_reset(board)) {
1772 rc = -EIO;
1773 break;
1774 }
1775 sx_dprintk(SX_DEBUG_INIT, "reset the board...\n");
1776
1777 tmp = kmalloc(SX_CHUNK_SIZE, GFP_USER);
1778 if (!tmp) {
1779 rc = -ENOMEM;
1780 break;
1781 }
1782 /* FIXME: check returns */
1783 get_user(nbytes, descr++);
1784 get_user(offset, descr++);
1785 get_user(data, descr++);
1786 while (nbytes && data) {
1787 for (i = 0; i < nbytes; i += SX_CHUNK_SIZE) {
1788 if (copy_from_user(tmp, (char __user *)data + i,
1789 (i + SX_CHUNK_SIZE > nbytes) ?
1790 nbytes - i : SX_CHUNK_SIZE)) {
1791 kfree(tmp);
1792 rc = -EFAULT;
1793 goto out;
1794 }
1795 memcpy_toio(board->base2 + offset + i, tmp,
1796 (i + SX_CHUNK_SIZE > nbytes) ?
1797 nbytes - i : SX_CHUNK_SIZE);
1798 }
1799
1800 get_user(nbytes, descr++);
1801 get_user(offset, descr++);
1802 get_user(data, descr++);
1803 }
1804 kfree(tmp);
1805 sx_nports += sx_init_board(board);
1806 rc = sx_nports;
1807 break;
1808 case SXIO_INIT:
1809 if (sx_initialized) { /* Already initialized */
1810 rc = -EEXIST;
1811 break;
1812 }
1813 /* This is not allowed until all boards are initialized... */
1814 for (i = 0; i < SX_NBOARDS; i++) {
1815 if ((boards[i].flags & SX_BOARD_PRESENT) &&
1816 !(boards[i].flags & SX_BOARD_INITIALIZED)) {
1817 rc = -EIO;
1818 break;
1819 }
1820 }
1821 for (i = 0; i < SX_NBOARDS; i++)
1822 if (!(boards[i].flags & SX_BOARD_PRESENT))
1823 break;
1824
1825 sx_dprintk(SX_DEBUG_FIRMWARE, "initing portstructs, %d boards, "
1826 "%d channels, first board: %d ports\n",
1827 i, sx_nports, boards[0].nports);
1828 rc = sx_init_portstructs(i, sx_nports);
1829 sx_init_drivers();
1830 if (rc >= 0)
1831 sx_initialized++;
1832 break;
1833 case SXIO_SETDEBUG:
1834 sx_debug = arg;
1835 break;
1836 case SXIO_GETDEBUG:
1837 rc = sx_debug;
1838 break;
1839 case SXIO_GETGSDEBUG:
1840 case SXIO_SETGSDEBUG:
1841 rc = -EINVAL;
1842 break;
1843 case SXIO_GETNPORTS:
1844 rc = sx_nports;
1845 break;
1846 default:
1847 rc = -ENOTTY;
1848 break;
1849 }
1850 out:
1851 unlock_kernel();
1852 func_exit();
1853 return rc;
1854 }
1855
1856 static int sx_break(struct tty_struct *tty, int flag)
1857 {
1858 struct sx_port *port = tty->driver_data;
1859 int rv;
1860
1861 func_enter();
1862 lock_kernel();
1863
1864 if (flag)
1865 rv = sx_send_command(port, HS_START, -1, HS_IDLE_BREAK);
1866 else
1867 rv = sx_send_command(port, HS_STOP, -1, HS_IDLE_OPEN);
1868 if (rv != 1)
1869 printk(KERN_ERR "sx: couldn't send break (%x).\n",
1870 read_sx_byte(port->board, CHAN_OFFSET(port, hi_hstat)));
1871 unlock_kernel();
1872 func_exit();
1873 return 0;
1874 }
1875
1876 static int sx_tiocmget(struct tty_struct *tty, struct file *file)
1877 {
1878 struct sx_port *port = tty->driver_data;
1879 return sx_getsignals(port);
1880 }
1881
1882 static int sx_tiocmset(struct tty_struct *tty, struct file *file,
1883 unsigned int set, unsigned int clear)
1884 {
1885 struct sx_port *port = tty->driver_data;
1886 int rts = -1, dtr = -1;
1887
1888 if (set & TIOCM_RTS)
1889 rts = 1;
1890 if (set & TIOCM_DTR)
1891 dtr = 1;
1892 if (clear & TIOCM_RTS)
1893 rts = 0;
1894 if (clear & TIOCM_DTR)
1895 dtr = 0;
1896
1897 sx_setsignals(port, dtr, rts);
1898 sx_reconfigure_port(port);
1899 return 0;
1900 }
1901
1902 static int sx_ioctl(struct tty_struct *tty, struct file *filp,
1903 unsigned int cmd, unsigned long arg)
1904 {
1905 int rc;
1906 struct sx_port *port = tty->driver_data;
1907 void __user *argp = (void __user *)arg;
1908
1909 /* func_enter2(); */
1910
1911 rc = 0;
1912 lock_kernel();
1913 switch (cmd) {
1914 case TIOCGSERIAL:
1915 rc = gs_getserial(&port->gs, argp);
1916 break;
1917 case TIOCSSERIAL:
1918 rc = gs_setserial(&port->gs, argp);
1919 break;
1920 default:
1921 rc = -ENOIOCTLCMD;
1922 break;
1923 }
1924 unlock_kernel();
1925
1926 /* func_exit(); */
1927 return rc;
1928 }
1929
1930 /* The throttle/unthrottle scheme for the Specialix card is different
1931 * from other drivers and deserves some explanation.
1932 * The Specialix hardware takes care of XON/XOFF
1933 * and CTS/RTS flow control itself. This means that all we have to
1934 * do when signalled by the upper tty layer to throttle/unthrottle is
1935 * to make a note of it here. When we come to read characters from the
1936 * rx buffers on the card (sx_receive_chars()) we look to see if the
1937 * upper layer can accept more (as noted here in sx_rx_throt[]).
1938 * If it can't we simply don't remove chars from the cards buffer.
1939 * When the tty layer can accept chars, we again note that here and when
1940 * sx_receive_chars() is called it will remove them from the cards buffer.
1941 * The card will notice that a ports buffer has drained below some low
1942 * water mark and will unflow control the line itself, using whatever
1943 * flow control scheme is in use for that port. -- Simon Allen
1944 */
1945
1946 static void sx_throttle(struct tty_struct *tty)
1947 {
1948 struct sx_port *port = tty->driver_data;
1949
1950 func_enter2();
1951 /* If the port is using any type of input flow
1952 * control then throttle the port.
1953 */
1954 if ((tty->termios->c_cflag & CRTSCTS) || (I_IXOFF(tty))) {
1955 port->gs.port.flags |= SX_RX_THROTTLE;
1956 }
1957 func_exit();
1958 }
1959
1960 static void sx_unthrottle(struct tty_struct *tty)
1961 {
1962 struct sx_port *port = tty->driver_data;
1963
1964 func_enter2();
1965 /* Always unthrottle even if flow control is not enabled on
1966 * this port in case we disabled flow control while the port
1967 * was throttled
1968 */
1969 port->gs.port.flags &= ~SX_RX_THROTTLE;
1970 func_exit();
1971 return;
1972 }
1973
1974 /* ********************************************************************** *
1975 * Here are the initialization routines. *
1976 * ********************************************************************** */
1977
1978 static int sx_init_board(struct sx_board *board)
1979 {
1980 int addr;
1981 int chans;
1982 int type;
1983
1984 func_enter();
1985
1986 /* This is preceded by downloading the download code. */
1987
1988 board->flags |= SX_BOARD_INITIALIZED;
1989
1990 if (read_sx_byte(board, 0))
1991 /* CF boards may need this. */
1992 write_sx_byte(board, 0, 0);
1993
1994 /* This resets the processor again, to make sure it didn't do any
1995 foolish things while we were downloading the image */
1996 if (!sx_reset(board))
1997 return 0;
1998
1999 sx_start_board(board);
2000 udelay(10);
2001 if (!sx_busy_wait_neq(board, 0, 0xff, 0)) {
2002 printk(KERN_ERR "sx: Ooops. Board won't initialize.\n");
2003 return 0;
2004 }
2005
2006 /* Ok. So now the processor on the card is running. It gathered
2007 some info for us... */
2008 sx_dprintk(SX_DEBUG_INIT, "The sxcard structure:\n");
2009 if (sx_debug & SX_DEBUG_INIT)
2010 my_hd_io(board->base, 0x10);
2011 sx_dprintk(SX_DEBUG_INIT, "the first sx_module structure:\n");
2012 if (sx_debug & SX_DEBUG_INIT)
2013 my_hd_io(board->base + 0x80, 0x30);
2014
2015 sx_dprintk(SX_DEBUG_INIT, "init_status: %x, %dk memory, firmware "
2016 "V%x.%02x,\n",
2017 read_sx_byte(board, 0), read_sx_byte(board, 1),
2018 read_sx_byte(board, 5), read_sx_byte(board, 4));
2019
2020 if (read_sx_byte(board, 0) == 0xff) {
2021 printk(KERN_INFO "sx: No modules found. Sorry.\n");
2022 board->nports = 0;
2023 return 0;
2024 }
2025
2026 chans = 0;
2027
2028 if (IS_SX_BOARD(board)) {
2029 sx_write_board_word(board, cc_int_count, sx_maxints);
2030 } else {
2031 if (sx_maxints)
2032 sx_write_board_word(board, cc_int_count,
2033 SI_PROCESSOR_CLOCK / 8 / sx_maxints);
2034 }
2035
2036 /* grab the first module type... */
2037 /* board->ta_type = mod_compat_type (read_sx_byte (board, 0x80 + 0x08)); */
2038 board->ta_type = mod_compat_type(sx_read_module_byte(board, 0x80,
2039 mc_chip));
2040
2041 /* XXX byteorder */
2042 for (addr = 0x80; addr != 0; addr = read_sx_word(board, addr) & 0x7fff){
2043 type = sx_read_module_byte(board, addr, mc_chip);
2044 sx_dprintk(SX_DEBUG_INIT, "Module at %x: %d channels\n",
2045 addr, read_sx_byte(board, addr + 2));
2046
2047 chans += sx_read_module_byte(board, addr, mc_type);
2048
2049 sx_dprintk(SX_DEBUG_INIT, "module is an %s, which has %s/%s "
2050 "panels\n",
2051 mod_type_s(type),
2052 pan_type_s(sx_read_module_byte(board, addr,
2053 mc_mods) & 0xf),
2054 pan_type_s(sx_read_module_byte(board, addr,
2055 mc_mods) >> 4));
2056
2057 sx_dprintk(SX_DEBUG_INIT, "CD1400 versions: %x/%x, ASIC "
2058 "version: %x\n",
2059 sx_read_module_byte(board, addr, mc_rev1),
2060 sx_read_module_byte(board, addr, mc_rev2),
2061 sx_read_module_byte(board, addr, mc_mtaasic_rev));
2062
2063 /* The following combinations are illegal: It should theoretically
2064 work, but timing problems make the bus HANG. */
2065
2066 if (mod_compat_type(type) != board->ta_type) {
2067 printk(KERN_ERR "sx: This is an invalid "
2068 "configuration.\nDon't mix TA/MTA/SXDC on the "
2069 "same hostadapter.\n");
2070 chans = 0;
2071 break;
2072 }
2073 if ((IS_EISA_BOARD(board) ||
2074 IS_SI_BOARD(board)) &&
2075 (mod_compat_type(type) == 4)) {
2076 printk(KERN_ERR "sx: This is an invalid "
2077 "configuration.\nDon't use SXDCs on an SI/XIO "
2078 "adapter.\n");
2079 chans = 0;
2080 break;
2081 }
2082 #if 0 /* Problem fixed: firmware 3.05 */
2083 if (IS_SX_BOARD(board) && (type == TA8)) {
2084 /* There are some issues with the firmware and the DCD/RTS
2085 lines. It might work if you tie them together or something.
2086 It might also work if you get a newer sx_firmware. Therefore
2087 this is just a warning. */
2088 printk(KERN_WARNING
2089 "sx: The SX host doesn't work too well "
2090 "with the TA8 adapters.\nSpecialix is working on it.\n");
2091 }
2092 #endif
2093 }
2094
2095 if (chans) {
2096 if (board->irq > 0) {
2097 /* fixed irq, probably PCI */
2098 if (sx_irqmask & (1 << board->irq)) { /* may we use this irq? */
2099 if (request_irq(board->irq, sx_interrupt,
2100 IRQF_SHARED | IRQF_DISABLED,
2101 "sx", board)) {
2102 printk(KERN_ERR "sx: Cannot allocate "
2103 "irq %d.\n", board->irq);
2104 board->irq = 0;
2105 }
2106 } else
2107 board->irq = 0;
2108 } else if (board->irq < 0 && sx_irqmask) {
2109 /* auto-allocate irq */
2110 int irqnr;
2111 int irqmask = sx_irqmask & (IS_SX_BOARD(board) ?
2112 SX_ISA_IRQ_MASK : SI2_ISA_IRQ_MASK);
2113 for (irqnr = 15; irqnr > 0; irqnr--)
2114 if (irqmask & (1 << irqnr))
2115 if (!request_irq(irqnr, sx_interrupt,
2116 IRQF_SHARED | IRQF_DISABLED,
2117 "sx", board))
2118 break;
2119 if (!irqnr)
2120 printk(KERN_ERR "sx: Cannot allocate IRQ.\n");
2121 board->irq = irqnr;
2122 } else
2123 board->irq = 0;
2124
2125 if (board->irq) {
2126 /* Found a valid interrupt, start up interrupts! */
2127 sx_dprintk(SX_DEBUG_INIT, "Using irq %d.\n",
2128 board->irq);
2129 sx_start_interrupts(board);
2130 board->poll = sx_slowpoll;
2131 board->flags |= SX_IRQ_ALLOCATED;
2132 } else {
2133 /* no irq: setup board for polled operation */
2134 board->poll = sx_poll;
2135 sx_dprintk(SX_DEBUG_INIT, "Using poll-interval %d.\n",
2136 board->poll);
2137 }
2138
2139 /* The timer should be initialized anyway: That way we can
2140 safely del_timer it when the module is unloaded. */
2141 setup_timer(&board->timer, sx_pollfunc, (unsigned long)board);
2142
2143 if (board->poll)
2144 mod_timer(&board->timer, jiffies + board->poll);
2145 } else {
2146 board->irq = 0;
2147 }
2148
2149 board->nports = chans;
2150 sx_dprintk(SX_DEBUG_INIT, "returning %d ports.", board->nports);
2151
2152 func_exit();
2153 return chans;
2154 }
2155
2156 static void __devinit printheader(void)
2157 {
2158 static int header_printed;
2159
2160 if (!header_printed) {
2161 printk(KERN_INFO "Specialix SX driver "
2162 "(C) 1998/1999 R.E.Wolff@BitWizard.nl\n");
2163 printk(KERN_INFO "sx: version " __stringify(SX_VERSION) "\n");
2164 header_printed = 1;
2165 }
2166 }
2167
2168 static int __devinit probe_sx(struct sx_board *board)
2169 {
2170 struct vpd_prom vpdp;
2171 char *p;
2172 int i;
2173
2174 func_enter();
2175
2176 if (!IS_CF_BOARD(board)) {
2177 sx_dprintk(SX_DEBUG_PROBE, "Going to verify vpd prom at %p.\n",
2178 board->base + SX_VPD_ROM);
2179
2180 if (sx_debug & SX_DEBUG_PROBE)
2181 my_hd_io(board->base + SX_VPD_ROM, 0x40);
2182
2183 p = (char *)&vpdp;
2184 for (i = 0; i < sizeof(struct vpd_prom); i++)
2185 *p++ = read_sx_byte(board, SX_VPD_ROM + i * 2);
2186
2187 if (sx_debug & SX_DEBUG_PROBE)
2188 my_hd(&vpdp, 0x20);
2189
2190 sx_dprintk(SX_DEBUG_PROBE, "checking identifier...\n");
2191
2192 if (strncmp(vpdp.identifier, SX_VPD_IDENT_STRING, 16) != 0) {
2193 sx_dprintk(SX_DEBUG_PROBE, "Got non-SX identifier: "
2194 "'%s'\n", vpdp.identifier);
2195 return 0;
2196 }
2197 }
2198
2199 printheader();
2200
2201 if (!IS_CF_BOARD(board)) {
2202 printk(KERN_DEBUG "sx: Found an SX board at %lx\n",
2203 board->hw_base);
2204 printk(KERN_DEBUG "sx: hw_rev: %d, assembly level: %d, "
2205 "uniq ID:%08x, ",
2206 vpdp.hwrev, vpdp.hwass, vpdp.uniqid);
2207 printk("Manufactured: %d/%d\n", 1970 + vpdp.myear, vpdp.mweek);
2208
2209 if ((((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) !=
2210 SX_PCI_UNIQUEID1) && (((vpdp.uniqid >> 24) &
2211 SX_UNIQUEID_MASK) != SX_ISA_UNIQUEID1)) {
2212 /* This might be a bit harsh. This was the primary
2213 reason the SX/ISA card didn't work at first... */
2214 printk(KERN_ERR "sx: Hmm. Not an SX/PCI or SX/ISA "
2215 "card. Sorry: giving up.\n");
2216 return (0);
2217 }
2218
2219 if (((vpdp.uniqid >> 24) & SX_UNIQUEID_MASK) ==
2220 SX_ISA_UNIQUEID1) {
2221 if (((unsigned long)board->hw_base) & 0x8000) {
2222 printk(KERN_WARNING "sx: Warning: There may be "
2223 "hardware problems with the card at "
2224 "%lx.\n", board->hw_base);
2225 printk(KERN_WARNING "sx: Read sx.txt for more "
2226 "info.\n");
2227 }
2228 }
2229 }
2230
2231 board->nports = -1;
2232
2233 /* This resets the processor, and keeps it off the bus. */
2234 if (!sx_reset(board))
2235 return 0;
2236 sx_dprintk(SX_DEBUG_INIT, "reset the board...\n");
2237
2238 func_exit();
2239 return 1;
2240 }
2241
2242 #if defined(CONFIG_ISA) || defined(CONFIG_EISA)
2243
2244 /* Specialix probes for this card at 32k increments from 640k to 16M.
2245 I consider machines with less than 16M unlikely nowadays, so I'm
2246 not probing above 1Mb. Also, 0xa0000, 0xb0000, are taken by the VGA
2247 card. 0xe0000 and 0xf0000 are taken by the BIOS. That only leaves
2248 0xc0000, 0xc8000, 0xd0000 and 0xd8000 . */
2249
2250 static int __devinit probe_si(struct sx_board *board)
2251 {
2252 int i;
2253
2254 func_enter();
2255 sx_dprintk(SX_DEBUG_PROBE, "Going to verify SI signature hw %lx at "
2256 "%p.\n", board->hw_base, board->base + SI2_ISA_ID_BASE);
2257
2258 if (sx_debug & SX_DEBUG_PROBE)
2259 my_hd_io(board->base + SI2_ISA_ID_BASE, 0x8);
2260
2261 if (!IS_EISA_BOARD(board)) {
2262 if (IS_SI1_BOARD(board)) {
2263 for (i = 0; i < 8; i++) {
2264 write_sx_byte(board, SI2_ISA_ID_BASE + 7 - i,i);
2265 }
2266 }
2267 for (i = 0; i < 8; i++) {
2268 if ((read_sx_byte(board, SI2_ISA_ID_BASE + 7 - i) & 7)
2269 != i) {
2270 func_exit();
2271 return 0;
2272 }
2273 }
2274 }
2275
2276 /* Now we're pretty much convinced that there is an SI board here,
2277 but to prevent trouble, we'd better double check that we don't
2278 have an SI1 board when we're probing for an SI2 board.... */
2279
2280 write_sx_byte(board, SI2_ISA_ID_BASE, 0x10);
2281 if (IS_SI1_BOARD(board)) {
2282 /* This should be an SI1 board, which has this
2283 location writable... */
2284 if (read_sx_byte(board, SI2_ISA_ID_BASE) != 0x10) {
2285 func_exit();
2286 return 0;
2287 }
2288 } else {
2289 /* This should be an SI2 board, which has the bottom
2290 3 bits non-writable... */
2291 if (read_sx_byte(board, SI2_ISA_ID_BASE) == 0x10) {
2292 func_exit();
2293 return 0;
2294 }
2295 }
2296
2297 /* Now we're pretty much convinced that there is an SI board here,
2298 but to prevent trouble, we'd better double check that we don't
2299 have an SI1 board when we're probing for an SI2 board.... */
2300
2301 write_sx_byte(board, SI2_ISA_ID_BASE, 0x10);
2302 if (IS_SI1_BOARD(board)) {
2303 /* This should be an SI1 board, which has this
2304 location writable... */
2305 if (read_sx_byte(board, SI2_ISA_ID_BASE) != 0x10) {
2306 func_exit();
2307 return 0;
2308 }
2309 } else {
2310 /* This should be an SI2 board, which has the bottom
2311 3 bits non-writable... */
2312 if (read_sx_byte(board, SI2_ISA_ID_BASE) == 0x10) {
2313 func_exit();
2314 return 0;
2315 }
2316 }
2317
2318 printheader();
2319
2320 printk(KERN_DEBUG "sx: Found an SI board at %lx\n", board->hw_base);
2321 /* Compared to the SX boards, it is a complete guess as to what
2322 this card is up to... */
2323
2324 board->nports = -1;
2325
2326 /* This resets the processor, and keeps it off the bus. */
2327 if (!sx_reset(board))
2328 return 0;
2329 sx_dprintk(SX_DEBUG_INIT, "reset the board...\n");
2330
2331 func_exit();
2332 return 1;
2333 }
2334 #endif
2335
2336 static const struct tty_operations sx_ops = {
2337 .break_ctl = sx_break,
2338 .open = sx_open,
2339 .close = gs_close,
2340 .write = gs_write,
2341 .put_char = gs_put_char,
2342 .flush_chars = gs_flush_chars,
2343 .write_room = gs_write_room,
2344 .chars_in_buffer = gs_chars_in_buffer,
2345 .flush_buffer = gs_flush_buffer,
2346 .ioctl = sx_ioctl,
2347 .throttle = sx_throttle,
2348 .unthrottle = sx_unthrottle,
2349 .set_termios = gs_set_termios,
2350 .stop = gs_stop,
2351 .start = gs_start,
2352 .hangup = gs_hangup,
2353 .tiocmget = sx_tiocmget,
2354 .tiocmset = sx_tiocmset,
2355 };
2356
2357 static const struct tty_port_operations sx_port_ops = {
2358 .carrier_raised = sx_carrier_raised,
2359 };
2360
2361 static int sx_init_drivers(void)
2362 {
2363 int error;
2364
2365 func_enter();
2366
2367 sx_driver = alloc_tty_driver(sx_nports);
2368 if (!sx_driver)
2369 return 1;
2370 sx_driver->owner = THIS_MODULE;
2371 sx_driver->driver_name = "specialix_sx";
2372 sx_driver->name = "ttyX";
2373 sx_driver->major = SX_NORMAL_MAJOR;
2374 sx_driver->type = TTY_DRIVER_TYPE_SERIAL;
2375 sx_driver->subtype = SERIAL_TYPE_NORMAL;
2376 sx_driver->init_termios = tty_std_termios;
2377 sx_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2378 sx_driver->init_termios.c_ispeed = 9600;
2379 sx_driver->init_termios.c_ospeed = 9600;
2380 sx_driver->flags = TTY_DRIVER_REAL_RAW;
2381 tty_set_operations(sx_driver, &sx_ops);
2382
2383 if ((error = tty_register_driver(sx_driver))) {
2384 put_tty_driver(sx_driver);
2385 printk(KERN_ERR "sx: Couldn't register sx driver, error = %d\n",
2386 error);
2387 return 1;
2388 }
2389 func_exit();
2390 return 0;
2391 }
2392
2393 static int sx_init_portstructs(int nboards, int nports)
2394 {
2395 struct sx_board *board;
2396 struct sx_port *port;
2397 int i, j;
2398 int addr, chans;
2399 int portno;
2400
2401 func_enter();
2402
2403 /* Many drivers statically allocate the maximum number of ports
2404 There is no reason not to allocate them dynamically.
2405 Is there? -- REW */
2406 sx_ports = kcalloc(nports, sizeof(struct sx_port), GFP_KERNEL);
2407 if (!sx_ports)
2408 return -ENOMEM;
2409
2410 port = sx_ports;
2411 for (i = 0; i < nboards; i++) {
2412 board = &boards[i];
2413 board->ports = port;
2414 for (j = 0; j < boards[i].nports; j++) {
2415 sx_dprintk(SX_DEBUG_INIT, "initing port %d\n", j);
2416 tty_port_init(&port->gs.port);
2417 port->gs.port.ops = &sx_port_ops;
2418 port->gs.magic = SX_MAGIC;
2419 port->gs.close_delay = HZ / 2;
2420 port->gs.closing_wait = 30 * HZ;
2421 port->board = board;
2422 port->gs.rd = &sx_real_driver;
2423 #ifdef NEW_WRITE_LOCKING
2424 port->gs.port_write_mutex = MUTEX;
2425 #endif
2426 spin_lock_init(&port->gs.driver_lock);
2427 /*
2428 * Initializing wait queue
2429 */
2430 port++;
2431 }
2432 }
2433
2434 port = sx_ports;
2435 portno = 0;
2436 for (i = 0; i < nboards; i++) {
2437 board = &boards[i];
2438 board->port_base = portno;
2439 /* Possibly the configuration was rejected. */
2440 sx_dprintk(SX_DEBUG_PROBE, "Board has %d channels\n",
2441 board->nports);
2442 if (board->nports <= 0)
2443 continue;
2444 /* XXX byteorder ?? */
2445 for (addr = 0x80; addr != 0;
2446 addr = read_sx_word(board, addr) & 0x7fff) {
2447 chans = sx_read_module_byte(board, addr, mc_type);
2448 sx_dprintk(SX_DEBUG_PROBE, "Module at %x: %d "
2449 "channels\n", addr, chans);
2450 sx_dprintk(SX_DEBUG_PROBE, "Port at");
2451 for (j = 0; j < chans; j++) {
2452 /* The "sx-way" is the way it SHOULD be done.
2453 That way in the future, the firmware may for
2454 example pack the structures a bit more
2455 efficient. Neil tells me it isn't going to
2456 happen anytime soon though. */
2457 if (IS_SX_BOARD(board))
2458 port->ch_base = sx_read_module_word(
2459 board, addr + j * 2,
2460 mc_chan_pointer);
2461 else
2462 port->ch_base = addr + 0x100 + 0x300 *j;
2463
2464 sx_dprintk(SX_DEBUG_PROBE, " %x",
2465 port->ch_base);
2466 port->line = portno++;
2467 port++;
2468 }
2469 sx_dprintk(SX_DEBUG_PROBE, "\n");
2470 }
2471 /* This has to be done earlier. */
2472 /* board->flags |= SX_BOARD_INITIALIZED; */
2473 }
2474
2475 func_exit();
2476 return 0;
2477 }
2478
2479 static unsigned int sx_find_free_board(void)
2480 {
2481 unsigned int i;
2482
2483 for (i = 0; i < SX_NBOARDS; i++)
2484 if (!(boards[i].flags & SX_BOARD_PRESENT))
2485 break;
2486
2487 return i;
2488 }
2489
2490 static void __exit sx_release_drivers(void)
2491 {
2492 func_enter();
2493 tty_unregister_driver(sx_driver);
2494 put_tty_driver(sx_driver);
2495 func_exit();
2496 }
2497
2498 static void __devexit sx_remove_card(struct sx_board *board,
2499 struct pci_dev *pdev)
2500 {
2501 if (board->flags & SX_BOARD_INITIALIZED) {
2502 /* The board should stop messing with us. (actually I mean the
2503 interrupt) */
2504 sx_reset(board);
2505 if ((board->irq) && (board->flags & SX_IRQ_ALLOCATED))
2506 free_irq(board->irq, board);
2507
2508 /* It is safe/allowed to del_timer a non-active timer */
2509 del_timer(&board->timer);
2510 if (pdev) {
2511 #ifdef CONFIG_PCI
2512 iounmap(board->base2);
2513 pci_release_region(pdev, IS_CF_BOARD(board) ? 3 : 2);
2514 #endif
2515 } else {
2516 iounmap(board->base);
2517 release_region(board->hw_base, board->hw_len);
2518 }
2519
2520 board->flags &= ~(SX_BOARD_INITIALIZED | SX_BOARD_PRESENT);
2521 }
2522 }
2523
2524 #ifdef CONFIG_EISA
2525
2526 static int __devinit sx_eisa_probe(struct device *dev)
2527 {
2528 struct eisa_device *edev = to_eisa_device(dev);
2529 struct sx_board *board;
2530 unsigned long eisa_slot = edev->base_addr;
2531 unsigned int i;
2532 int retval = -EIO;
2533
2534 mutex_lock(&sx_boards_lock);
2535 i = sx_find_free_board();
2536 if (i == SX_NBOARDS) {
2537 mutex_unlock(&sx_boards_lock);
2538 goto err;
2539 }
2540 board = &boards[i];
2541 board->flags |= SX_BOARD_PRESENT;
2542 mutex_unlock(&sx_boards_lock);
2543
2544 dev_info(dev, "XIO : Signature found in EISA slot %lu, "
2545 "Product %d Rev %d (REPORT THIS TO LKLM)\n",
2546 eisa_slot >> 12,
2547 inb(eisa_slot + EISA_VENDOR_ID_OFFSET + 2),
2548 inb(eisa_slot + EISA_VENDOR_ID_OFFSET + 3));
2549
2550 board->eisa_base = eisa_slot;
2551 board->flags &= ~SX_BOARD_TYPE;
2552 board->flags |= SI_EISA_BOARD;
2553
2554 board->hw_base = ((inb(eisa_slot + 0xc01) << 8) +
2555 inb(eisa_slot + 0xc00)) << 16;
2556 board->hw_len = SI2_EISA_WINDOW_LEN;
2557 if (!request_region(board->hw_base, board->hw_len, "sx")) {
2558 dev_err(dev, "can't request region\n");
2559 goto err_flag;
2560 }
2561 board->base2 =
2562 board->base = ioremap_nocache(board->hw_base, SI2_EISA_WINDOW_LEN);
2563 if (!board->base) {
2564 dev_err(dev, "can't remap memory\n");
2565 goto err_reg;
2566 }
2567
2568 sx_dprintk(SX_DEBUG_PROBE, "IO hw_base address: %lx\n", board->hw_base);
2569 sx_dprintk(SX_DEBUG_PROBE, "base: %p\n", board->base);
2570 board->irq = inb(eisa_slot + 0xc02) >> 4;
2571 sx_dprintk(SX_DEBUG_PROBE, "IRQ: %d\n", board->irq);
2572
2573 if (!probe_si(board))
2574 goto err_unmap;
2575
2576 dev_set_drvdata(dev, board);
2577
2578 return 0;
2579 err_unmap:
2580 iounmap(board->base);
2581 err_reg:
2582 release_region(board->hw_base, board->hw_len);
2583 err_flag:
2584 board->flags &= ~SX_BOARD_PRESENT;
2585 err:
2586 return retval;
2587 }
2588
2589 static int __devexit sx_eisa_remove(struct device *dev)
2590 {
2591 struct sx_board *board = dev_get_drvdata(dev);
2592
2593 sx_remove_card(board, NULL);
2594
2595 return 0;
2596 }
2597
2598 static struct eisa_device_id sx_eisa_tbl[] = {
2599 { "SLX" },
2600 { "" }
2601 };
2602
2603 MODULE_DEVICE_TABLE(eisa, sx_eisa_tbl);
2604
2605 static struct eisa_driver sx_eisadriver = {
2606 .id_table = sx_eisa_tbl,
2607 .driver = {
2608 .name = "sx",
2609 .probe = sx_eisa_probe,
2610 .remove = __devexit_p(sx_eisa_remove),
2611 }
2612 };
2613
2614 #endif
2615
2616 #ifdef CONFIG_PCI
2617 /********************************************************
2618 * Setting bit 17 in the CNTRL register of the PLX 9050 *
2619 * chip forces a retry on writes while a read is pending.*
2620 * This is to prevent the card locking up on Intel Xeon *
2621 * multiprocessor systems with the NX chipset. -- NV *
2622 ********************************************************/
2623
2624 /* Newer cards are produced with this bit set from the configuration
2625 EEprom. As the bit is read/write for the CPU, we can fix it here,
2626 if we detect that it isn't set correctly. -- REW */
2627
2628 static void __devinit fix_sx_pci(struct pci_dev *pdev, struct sx_board *board)
2629 {
2630 unsigned int hwbase;
2631 void __iomem *rebase;
2632 unsigned int t;
2633
2634 #define CNTRL_REG_OFFSET 0x50
2635 #define CNTRL_REG_GOODVALUE 0x18260000
2636
2637 pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &hwbase);
2638 hwbase &= PCI_BASE_ADDRESS_MEM_MASK;
2639 rebase = ioremap_nocache(hwbase, 0x80);
2640 t = readl(rebase + CNTRL_REG_OFFSET);
2641 if (t != CNTRL_REG_GOODVALUE) {
2642 printk(KERN_DEBUG "sx: performing cntrl reg fix: %08x -> "
2643 "%08x\n", t, CNTRL_REG_GOODVALUE);
2644 writel(CNTRL_REG_GOODVALUE, rebase + CNTRL_REG_OFFSET);
2645 }
2646 iounmap(rebase);
2647 }
2648 #endif
2649
2650 static int __devinit sx_pci_probe(struct pci_dev *pdev,
2651 const struct pci_device_id *ent)
2652 {
2653 #ifdef CONFIG_PCI
2654 struct sx_board *board;
2655 unsigned int i, reg;
2656 int retval = -EIO;
2657
2658 mutex_lock(&sx_boards_lock);
2659 i = sx_find_free_board();
2660 if (i == SX_NBOARDS) {
2661 mutex_unlock(&sx_boards_lock);
2662 goto err;
2663 }
2664 board = &boards[i];
2665 board->flags |= SX_BOARD_PRESENT;
2666 mutex_unlock(&sx_boards_lock);
2667
2668 retval = pci_enable_device(pdev);
2669 if (retval)
2670 goto err_flag;
2671
2672 board->flags &= ~SX_BOARD_TYPE;
2673 board->flags |= (pdev->subsystem_vendor == 0x200) ? SX_PCI_BOARD :
2674 SX_CFPCI_BOARD;
2675
2676 /* CF boards use base address 3.... */
2677 reg = IS_CF_BOARD(board) ? 3 : 2;
2678 retval = pci_request_region(pdev, reg, "sx");
2679 if (retval) {
2680 dev_err(&pdev->dev, "can't request region\n");
2681 goto err_flag;
2682 }
2683 board->hw_base = pci_resource_start(pdev, reg);
2684 board->base2 =
2685 board->base = ioremap_nocache(board->hw_base, WINDOW_LEN(board));
2686 if (!board->base) {
2687 dev_err(&pdev->dev, "ioremap failed\n");
2688 goto err_reg;
2689 }
2690
2691 /* Most of the stuff on the CF board is offset by 0x18000 .... */
2692 if (IS_CF_BOARD(board))
2693 board->base += 0x18000;
2694
2695 board->irq = pdev->irq;
2696
2697 dev_info(&pdev->dev, "Got a specialix card: %p(%d) %x.\n", board->base,
2698 board->irq, board->flags);
2699
2700 if (!probe_sx(board)) {
2701 retval = -EIO;
2702 goto err_unmap;
2703 }
2704
2705 fix_sx_pci(pdev, board);
2706
2707 pci_set_drvdata(pdev, board);
2708
2709 return 0;
2710 err_unmap:
2711 iounmap(board->base2);
2712 err_reg:
2713 pci_release_region(pdev, reg);
2714 err_flag:
2715 board->flags &= ~SX_BOARD_PRESENT;
2716 err:
2717 return retval;
2718 #else
2719 return -ENODEV;
2720 #endif
2721 }
2722
2723 static void __devexit sx_pci_remove(struct pci_dev *pdev)
2724 {
2725 struct sx_board *board = pci_get_drvdata(pdev);
2726
2727 sx_remove_card(board, pdev);
2728 }
2729
2730 /* Specialix has a whole bunch of cards with 0x2000 as the device ID. They say
2731 its because the standard requires it. So check for SUBVENDOR_ID. */
2732 static struct pci_device_id sx_pci_tbl[] = {
2733 { PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8,
2734 .subvendor = PCI_ANY_ID, .subdevice = 0x0200 },
2735 { PCI_VENDOR_ID_SPECIALIX, PCI_DEVICE_ID_SPECIALIX_SX_XIO_IO8,
2736 .subvendor = PCI_ANY_ID, .subdevice = 0x0300 },
2737 { 0 }
2738 };
2739
2740 MODULE_DEVICE_TABLE(pci, sx_pci_tbl);
2741
2742 static struct pci_driver sx_pcidriver = {
2743 .name = "sx",
2744 .id_table = sx_pci_tbl,
2745 .probe = sx_pci_probe,
2746 .remove = __devexit_p(sx_pci_remove)
2747 };
2748
2749 static int __init sx_init(void)
2750 {
2751 #ifdef CONFIG_EISA
2752 int retval1;
2753 #endif
2754 #ifdef CONFIG_ISA
2755 struct sx_board *board;
2756 unsigned int i;
2757 #endif
2758 unsigned int found = 0;
2759 int retval;
2760
2761 func_enter();
2762 sx_dprintk(SX_DEBUG_INIT, "Initing sx module... (sx_debug=%d)\n",
2763 sx_debug);
2764 if (abs((long)(&sx_debug) - sx_debug) < 0x10000) {
2765 printk(KERN_WARNING "sx: sx_debug is an address, instead of a "
2766 "value. Assuming -1.\n(%p)\n", &sx_debug);
2767 sx_debug = -1;
2768 }
2769
2770 if (misc_register(&sx_fw_device) < 0) {
2771 printk(KERN_ERR "SX: Unable to register firmware loader "
2772 "driver.\n");
2773 return -EIO;
2774 }
2775 #ifdef CONFIG_ISA
2776 for (i = 0; i < NR_SX_ADDRS; i++) {
2777 board = &boards[found];
2778 board->hw_base = sx_probe_addrs[i];
2779 board->hw_len = SX_WINDOW_LEN;
2780 if (!request_region(board->hw_base, board->hw_len, "sx"))
2781 continue;
2782 board->base2 =
2783 board->base = ioremap_nocache(board->hw_base, board->hw_len);
2784 if (!board->base)
2785 goto err_sx_reg;
2786 board->flags &= ~SX_BOARD_TYPE;
2787 board->flags |= SX_ISA_BOARD;
2788 board->irq = sx_irqmask ? -1 : 0;
2789
2790 if (probe_sx(board)) {
2791 board->flags |= SX_BOARD_PRESENT;
2792 found++;
2793 } else {
2794 iounmap(board->base);
2795 err_sx_reg:
2796 release_region(board->hw_base, board->hw_len);
2797 }
2798 }
2799
2800 for (i = 0; i < NR_SI_ADDRS; i++) {
2801 board = &boards[found];
2802 board->hw_base = si_probe_addrs[i];
2803 board->hw_len = SI2_ISA_WINDOW_LEN;
2804 if (!request_region(board->hw_base, board->hw_len, "sx"))
2805 continue;
2806 board->base2 =
2807 board->base = ioremap_nocache(board->hw_base, board->hw_len);
2808 if (!board->base)
2809 goto err_si_reg;
2810 board->flags &= ~SX_BOARD_TYPE;
2811 board->flags |= SI_ISA_BOARD;
2812 board->irq = sx_irqmask ? -1 : 0;
2813
2814 if (probe_si(board)) {
2815 board->flags |= SX_BOARD_PRESENT;
2816 found++;
2817 } else {
2818 iounmap(board->base);
2819 err_si_reg:
2820 release_region(board->hw_base, board->hw_len);
2821 }
2822 }
2823 for (i = 0; i < NR_SI1_ADDRS; i++) {
2824 board = &boards[found];
2825 board->hw_base = si1_probe_addrs[i];
2826 board->hw_len = SI1_ISA_WINDOW_LEN;
2827 if (!request_region(board->hw_base, board->hw_len, "sx"))
2828 continue;
2829 board->base2 =
2830 board->base = ioremap_nocache(board->hw_base, board->hw_len);
2831 if (!board->base)
2832 goto err_si1_reg;
2833 board->flags &= ~SX_BOARD_TYPE;
2834 board->flags |= SI1_ISA_BOARD;
2835 board->irq = sx_irqmask ? -1 : 0;
2836
2837 if (probe_si(board)) {
2838 board->flags |= SX_BOARD_PRESENT;
2839 found++;
2840 } else {
2841 iounmap(board->base);
2842 err_si1_reg:
2843 release_region(board->hw_base, board->hw_len);
2844 }
2845 }
2846 #endif
2847 #ifdef CONFIG_EISA
2848 retval1 = eisa_driver_register(&sx_eisadriver);
2849 #endif
2850 retval = pci_register_driver(&sx_pcidriver);
2851
2852 if (found) {
2853 printk(KERN_INFO "sx: total of %d boards detected.\n", found);
2854 retval = 0;
2855 } else if (retval) {
2856 #ifdef CONFIG_EISA
2857 retval = retval1;
2858 if (retval1)
2859 #endif
2860 misc_deregister(&sx_fw_device);
2861 }
2862
2863 func_exit();
2864 return retval;
2865 }
2866
2867 static void __exit sx_exit(void)
2868 {
2869 int i;
2870
2871 func_enter();
2872 #ifdef CONFIG_EISA
2873 eisa_driver_unregister(&sx_eisadriver);
2874 #endif
2875 pci_unregister_driver(&sx_pcidriver);
2876
2877 for (i = 0; i < SX_NBOARDS; i++)
2878 sx_remove_card(&boards[i], NULL);
2879
2880 if (misc_deregister(&sx_fw_device) < 0) {
2881 printk(KERN_INFO "sx: couldn't deregister firmware loader "
2882 "device\n");
2883 }
2884 sx_dprintk(SX_DEBUG_CLEANUP, "Cleaning up drivers (%d)\n",
2885 sx_initialized);
2886 if (sx_initialized)
2887 sx_release_drivers();
2888
2889 kfree(sx_ports);
2890 func_exit();
2891 }
2892
2893 module_init(sx_init);
2894 module_exit(sx_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree