1 /*
2 * ISA Plug & Play support
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 *
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 * Changelog:
21 * 2000-01-01 Added quirks handling for buggy hardware
22 * Peter Denison <peterd@pnd-pc.demon.co.uk>
23 * 2000-06-14 Added isapnp_probe_devs() and isapnp_activate_dev()
24 * Christoph Hellwig <hch@infradead.org>
25 * 2001-06-03 Added release_region calls to correspond with
26 * request_region calls when a failure occurs. Also
27 * added KERN_* constants to printk() calls.
28 * 2001-11-07 Added isapnp_{,un}register_driver calls along the lines
29 * of the pci driver interface
30 * Kai Germaschewski <kai.germaschewski@gmx.de>
31 * 2002-06-06 Made the use of dma channel 0 configurable
32 * Gerald Teschl <gerald.teschl@univie.ac.at>
33 * 2002-10-06 Ported to PnP Layer - Adam Belay <ambx1@neo.rr.com>
34 * 2003-08-11 Resource Management Updates - Adam Belay <ambx1@neo.rr.com>
35 */
36
37 #include <linux/module.h>
38 #include <linux/kernel.h>
39 #include <linux/errno.h>
40 #include <linux/delay.h>
41 #include <linux/init.h>
42 #include <linux/isapnp.h>
43 #include <linux/mutex.h>
44 #include <asm/io.h>
45
46 #include "../base.h"
47
48 #if 0
49 #define ISAPNP_REGION_OK
50 #endif
51
52 int isapnp_disable; /* Disable ISA PnP */
53 static int isapnp_rdp; /* Read Data Port */
54 static int isapnp_reset = 1; /* reset all PnP cards (deactivate) */
55 static int isapnp_verbose = 1; /* verbose mode */
56
57 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
58 MODULE_DESCRIPTION("Generic ISA Plug & Play support");
59 module_param(isapnp_disable, int, 0);
60 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable");
61 module_param(isapnp_rdp, int, 0);
62 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
63 module_param(isapnp_reset, int, 0);
64 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
65 module_param(isapnp_verbose, int, 0);
66 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
67 MODULE_LICENSE("GPL");
68
69 #define _PIDXR 0x279
70 #define _PNPWRP 0xa79
71
72 /* short tags */
73 #define _STAG_PNPVERNO 0x01
74 #define _STAG_LOGDEVID 0x02
75 #define _STAG_COMPATDEVID 0x03
76 #define _STAG_IRQ 0x04
77 #define _STAG_DMA 0x05
78 #define _STAG_STARTDEP 0x06
79 #define _STAG_ENDDEP 0x07
80 #define _STAG_IOPORT 0x08
81 #define _STAG_FIXEDIO 0x09
82 #define _STAG_VENDOR 0x0e
83 #define _STAG_END 0x0f
84 /* long tags */
85 #define _LTAG_MEMRANGE 0x81
86 #define _LTAG_ANSISTR 0x82
87 #define _LTAG_UNICODESTR 0x83
88 #define _LTAG_VENDOR 0x84
89 #define _LTAG_MEM32RANGE 0x85
90 #define _LTAG_FIXEDMEM32RANGE 0x86
91
92 /* Logical device control and configuration registers */
93
94 #define ISAPNP_CFG_ACTIVATE 0x30 /* byte */
95 #define ISAPNP_CFG_MEM 0x40 /* 4 * dword */
96 #define ISAPNP_CFG_PORT 0x60 /* 8 * word */
97 #define ISAPNP_CFG_IRQ 0x70 /* 2 * word */
98 #define ISAPNP_CFG_DMA 0x74 /* 2 * byte */
99
100 /*
101 * Sizes of ISAPNP logical device configuration register sets.
102 * See PNP-ISA-v1.0a.pdf, Appendix A.
103 */
104 #define ISAPNP_MAX_MEM 4
105 #define ISAPNP_MAX_PORT 8
106 #define ISAPNP_MAX_IRQ 2
107 #define ISAPNP_MAX_DMA 2
108
109 static unsigned char isapnp_checksum_value;
110 static DEFINE_MUTEX(isapnp_cfg_mutex);
111 static int isapnp_csn_count;
112
113 /* some prototypes */
114
write_data(unsigned char x)115 static inline void write_data(unsigned char x)
116 {
117 outb(x, _PNPWRP);
118 }
119
write_address(unsigned char x)120 static inline void write_address(unsigned char x)
121 {
122 outb(x, _PIDXR);
123 udelay(20);
124 }
125
read_data(void)126 static inline unsigned char read_data(void)
127 {
128 unsigned char val = inb(isapnp_rdp);
129 return val;
130 }
131
isapnp_read_byte(unsigned char idx)132 unsigned char isapnp_read_byte(unsigned char idx)
133 {
134 write_address(idx);
135 return read_data();
136 }
137
isapnp_read_word(unsigned char idx)138 static unsigned short isapnp_read_word(unsigned char idx)
139 {
140 unsigned short val;
141
142 val = isapnp_read_byte(idx);
143 val = (val << 8) + isapnp_read_byte(idx + 1);
144 return val;
145 }
146
isapnp_write_byte(unsigned char idx,unsigned char val)147 void isapnp_write_byte(unsigned char idx, unsigned char val)
148 {
149 write_address(idx);
150 write_data(val);
151 }
152
isapnp_write_word(unsigned char idx,unsigned short val)153 static void isapnp_write_word(unsigned char idx, unsigned short val)
154 {
155 isapnp_write_byte(idx, val >> 8);
156 isapnp_write_byte(idx + 1, val);
157 }
158
isapnp_key(void)159 static void isapnp_key(void)
160 {
161 unsigned char code = 0x6a, msb;
162 int i;
163
164 mdelay(1);
165 write_address(0x00);
166 write_address(0x00);
167
168 write_address(code);
169
170 for (i = 1; i < 32; i++) {
171 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
172 code = (code >> 1) | msb;
173 write_address(code);
174 }
175 }
176
177 /* place all pnp cards in wait-for-key state */
isapnp_wait(void)178 static void isapnp_wait(void)
179 {
180 isapnp_write_byte(0x02, 0x02);
181 }
182
isapnp_wake(unsigned char csn)183 static void isapnp_wake(unsigned char csn)
184 {
185 isapnp_write_byte(0x03, csn);
186 }
187
isapnp_device(unsigned char logdev)188 static void isapnp_device(unsigned char logdev)
189 {
190 isapnp_write_byte(0x07, logdev);
191 }
192
isapnp_activate(unsigned char logdev)193 static void isapnp_activate(unsigned char logdev)
194 {
195 isapnp_device(logdev);
196 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
197 udelay(250);
198 }
199
isapnp_deactivate(unsigned char logdev)200 static void isapnp_deactivate(unsigned char logdev)
201 {
202 isapnp_device(logdev);
203 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
204 udelay(500);
205 }
206
isapnp_peek(unsigned char * data,int bytes)207 static void __init isapnp_peek(unsigned char *data, int bytes)
208 {
209 int i, j;
210 unsigned char d = 0;
211
212 for (i = 1; i <= bytes; i++) {
213 for (j = 0; j < 20; j++) {
214 d = isapnp_read_byte(0x05);
215 if (d & 1)
216 break;
217 udelay(100);
218 }
219 if (!(d & 1)) {
220 if (data != NULL)
221 *data++ = 0xff;
222 continue;
223 }
224 d = isapnp_read_byte(0x04); /* PRESDI */
225 isapnp_checksum_value += d;
226 if (data != NULL)
227 *data++ = d;
228 }
229 }
230
231 #define RDP_STEP 32 /* minimum is 4 */
232
isapnp_next_rdp(void)233 static int isapnp_next_rdp(void)
234 {
235 int rdp = isapnp_rdp;
236 static int old_rdp = 0;
237
238 if (old_rdp) {
239 release_region(old_rdp, 1);
240 old_rdp = 0;
241 }
242 while (rdp <= 0x3ff) {
243 /*
244 * We cannot use NE2000 probe spaces for ISAPnP or we
245 * will lock up machines.
246 */
247 if ((rdp < 0x280 || rdp > 0x380)
248 && request_region(rdp, 1, "ISAPnP")) {
249 isapnp_rdp = rdp;
250 old_rdp = rdp;
251 return 0;
252 }
253 rdp += RDP_STEP;
254 }
255 return -1;
256 }
257
258 /* Set read port address */
isapnp_set_rdp(void)259 static inline void isapnp_set_rdp(void)
260 {
261 isapnp_write_byte(0x00, isapnp_rdp >> 2);
262 udelay(100);
263 }
264
265 /*
266 * Perform an isolation. The port selection code now tries to avoid
267 * "dangerous to read" ports.
268 */
isapnp_isolate_rdp_select(void)269 static int __init isapnp_isolate_rdp_select(void)
270 {
271 isapnp_wait();
272 isapnp_key();
273
274 /* Control: reset CSN and conditionally everything else too */
275 isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
276 mdelay(2);
277
278 isapnp_wait();
279 isapnp_key();
280 isapnp_wake(0x00);
281
282 if (isapnp_next_rdp() < 0) {
283 isapnp_wait();
284 return -1;
285 }
286
287 isapnp_set_rdp();
288 udelay(1000);
289 write_address(0x01);
290 udelay(1000);
291 return 0;
292 }
293
294 /*
295 * Isolate (assign uniqued CSN) to all ISA PnP devices.
296 */
isapnp_isolate(void)297 static int __init isapnp_isolate(void)
298 {
299 unsigned char checksum = 0x6a;
300 unsigned char chksum = 0x00;
301 unsigned char bit = 0x00;
302 int data;
303 int csn = 0;
304 int i;
305 int iteration = 1;
306
307 isapnp_rdp = 0x213;
308 if (isapnp_isolate_rdp_select() < 0)
309 return -1;
310
311 while (1) {
312 for (i = 1; i <= 64; i++) {
313 data = read_data() << 8;
314 udelay(250);
315 data = data | read_data();
316 udelay(250);
317 if (data == 0x55aa)
318 bit = 0x01;
319 checksum =
320 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
321 | (checksum >> 1);
322 bit = 0x00;
323 }
324 for (i = 65; i <= 72; i++) {
325 data = read_data() << 8;
326 udelay(250);
327 data = data | read_data();
328 udelay(250);
329 if (data == 0x55aa)
330 chksum |= (1 << (i - 65));
331 }
332 if (checksum != 0x00 && checksum == chksum) {
333 csn++;
334
335 isapnp_write_byte(0x06, csn);
336 udelay(250);
337 iteration++;
338 isapnp_wake(0x00);
339 isapnp_set_rdp();
340 udelay(1000);
341 write_address(0x01);
342 udelay(1000);
343 goto __next;
344 }
345 if (iteration == 1) {
346 isapnp_rdp += RDP_STEP;
347 if (isapnp_isolate_rdp_select() < 0)
348 return -1;
349 } else if (iteration > 1) {
350 break;
351 }
352 __next:
353 if (csn == 255)
354 break;
355 checksum = 0x6a;
356 chksum = 0x00;
357 bit = 0x00;
358 }
359 isapnp_wait();
360 isapnp_csn_count = csn;
361 return csn;
362 }
363
364 /*
365 * Read one tag from stream.
366 */
isapnp_read_tag(unsigned char * type,unsigned short * size)367 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
368 {
369 unsigned char tag, tmp[2];
370
371 isapnp_peek(&tag, 1);
372 if (tag == 0) /* invalid tag */
373 return -1;
374 if (tag & 0x80) { /* large item */
375 *type = tag;
376 isapnp_peek(tmp, 2);
377 *size = (tmp[1] << 8) | tmp[0];
378 } else {
379 *type = (tag >> 3) & 0x0f;
380 *size = tag & 0x07;
381 }
382 #if 0
383 printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type,
384 *size);
385 #endif
386 if (*type == 0xff && *size == 0xffff) /* probably invalid data */
387 return -1;
388 return 0;
389 }
390
391 /*
392 * Skip specified number of bytes from stream.
393 */
isapnp_skip_bytes(int count)394 static void __init isapnp_skip_bytes(int count)
395 {
396 isapnp_peek(NULL, count);
397 }
398
399 /*
400 * Parse logical device tag.
401 */
isapnp_parse_device(struct pnp_card * card,int size,int number)402 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
403 int size, int number)
404 {
405 unsigned char tmp[6];
406 struct pnp_dev *dev;
407 u32 eisa_id;
408 char id[8];
409
410 isapnp_peek(tmp, size);
411 eisa_id = tmp[0] | tmp[1] << 8 | tmp[2] << 16 | tmp[3] << 24;
412 pnp_eisa_id_to_string(eisa_id, id);
413
414 dev = pnp_alloc_dev(&isapnp_protocol, number, id);
415 if (!dev)
416 return NULL;
417
418 dev->card = card;
419 dev->capabilities |= PNP_CONFIGURABLE;
420 dev->capabilities |= PNP_READ;
421 dev->capabilities |= PNP_WRITE;
422 dev->capabilities |= PNP_DISABLE;
423 pnp_init_resources(dev);
424 return dev;
425 }
426
427 /*
428 * Add IRQ resource to resources list.
429 */
isapnp_parse_irq_resource(struct pnp_dev * dev,unsigned int option_flags,int size)430 static void __init isapnp_parse_irq_resource(struct pnp_dev *dev,
431 unsigned int option_flags,
432 int size)
433 {
434 unsigned char tmp[3];
435 unsigned long bits;
436 pnp_irq_mask_t map;
437 unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
438
439 isapnp_peek(tmp, size);
440 bits = (tmp[1] << 8) | tmp[0];
441
442 bitmap_zero(map.bits, PNP_IRQ_NR);
443 bitmap_copy(map.bits, &bits, 16);
444
445 if (size > 2)
446 flags = tmp[2];
447
448 pnp_register_irq_resource(dev, option_flags, &map, flags);
449 }
450
451 /*
452 * Add DMA resource to resources list.
453 */
isapnp_parse_dma_resource(struct pnp_dev * dev,unsigned int option_flags,int size)454 static void __init isapnp_parse_dma_resource(struct pnp_dev *dev,
455 unsigned int option_flags,
456 int size)
457 {
458 unsigned char tmp[2];
459
460 isapnp_peek(tmp, size);
461 pnp_register_dma_resource(dev, option_flags, tmp[0], tmp[1]);
462 }
463
464 /*
465 * Add port resource to resources list.
466 */
isapnp_parse_port_resource(struct pnp_dev * dev,unsigned int option_flags,int size)467 static void __init isapnp_parse_port_resource(struct pnp_dev *dev,
468 unsigned int option_flags,
469 int size)
470 {
471 unsigned char tmp[7];
472 resource_size_t min, max, align, len;
473 unsigned char flags;
474
475 isapnp_peek(tmp, size);
476 min = (tmp[2] << 8) | tmp[1];
477 max = (tmp[4] << 8) | tmp[3];
478 align = tmp[5];
479 len = tmp[6];
480 flags = tmp[0] ? IORESOURCE_IO_16BIT_ADDR : 0;
481 pnp_register_port_resource(dev, option_flags,
482 min, max, align, len, flags);
483 }
484
485 /*
486 * Add fixed port resource to resources list.
487 */
isapnp_parse_fixed_port_resource(struct pnp_dev * dev,unsigned int option_flags,int size)488 static void __init isapnp_parse_fixed_port_resource(struct pnp_dev *dev,
489 unsigned int option_flags,
490 int size)
491 {
492 unsigned char tmp[3];
493 resource_size_t base, len;
494
495 isapnp_peek(tmp, size);
496 base = (tmp[1] << 8) | tmp[0];
497 len = tmp[2];
498 pnp_register_port_resource(dev, option_flags, base, base, 0, len,
499 IORESOURCE_IO_FIXED);
500 }
501
502 /*
503 * Add memory resource to resources list.
504 */
isapnp_parse_mem_resource(struct pnp_dev * dev,unsigned int option_flags,int size)505 static void __init isapnp_parse_mem_resource(struct pnp_dev *dev,
506 unsigned int option_flags,
507 int size)
508 {
509 unsigned char tmp[9];
510 resource_size_t min, max, align, len;
511 unsigned char flags;
512
513 isapnp_peek(tmp, size);
514 min = ((tmp[2] << 8) | tmp[1]) << 8;
515 max = ((tmp[4] << 8) | tmp[3]) << 8;
516 align = (tmp[6] << 8) | tmp[5];
517 len = ((tmp[8] << 8) | tmp[7]) << 8;
518 flags = tmp[0];
519 pnp_register_mem_resource(dev, option_flags,
520 min, max, align, len, flags);
521 }
522
523 /*
524 * Add 32-bit memory resource to resources list.
525 */
isapnp_parse_mem32_resource(struct pnp_dev * dev,unsigned int option_flags,int size)526 static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev,
527 unsigned int option_flags,
528 int size)
529 {
530 unsigned char tmp[17];
531 resource_size_t min, max, align, len;
532 unsigned char flags;
533
534 isapnp_peek(tmp, size);
535 min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
536 max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
537 align = (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
538 len = (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
539 flags = tmp[0];
540 pnp_register_mem_resource(dev, option_flags,
541 min, max, align, len, flags);
542 }
543
544 /*
545 * Add 32-bit fixed memory resource to resources list.
546 */
isapnp_parse_fixed_mem32_resource(struct pnp_dev * dev,unsigned int option_flags,int size)547 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev,
548 unsigned int option_flags,
549 int size)
550 {
551 unsigned char tmp[9];
552 resource_size_t base, len;
553 unsigned char flags;
554
555 isapnp_peek(tmp, size);
556 base = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
557 len = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
558 flags = tmp[0];
559 pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
560 }
561
562 /*
563 * Parse card name for ISA PnP device.
564 */
565 static void __init
isapnp_parse_name(char * name,unsigned int name_max,unsigned short * size)566 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
567 {
568 if (name[0] == '\0') {
569 unsigned short size1 =
570 *size >= name_max ? (name_max - 1) : *size;
571 isapnp_peek(name, size1);
572 name[size1] = '\0';
573 *size -= size1;
574
575 /* clean whitespace from end of string */
576 while (size1 > 0 && name[--size1] == ' ')
577 name[size1] = '\0';
578 }
579 }
580
581 /*
582 * Parse resource map for logical device.
583 */
isapnp_create_device(struct pnp_card * card,unsigned short size)584 static int __init isapnp_create_device(struct pnp_card *card,
585 unsigned short size)
586 {
587 int number = 0, skip = 0, priority, compat = 0;
588 unsigned char type, tmp[17];
589 unsigned int option_flags;
590 struct pnp_dev *dev;
591 u32 eisa_id;
592 char id[8];
593
594 if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
595 return 1;
596 option_flags = 0;
597 pnp_add_card_device(card, dev);
598
599 while (1) {
600 if (isapnp_read_tag(&type, &size) < 0)
601 return 1;
602 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
603 goto __skip;
604 switch (type) {
605 case _STAG_LOGDEVID:
606 if (size >= 5 && size <= 6) {
607 if ((dev =
608 isapnp_parse_device(card, size,
609 number++)) == NULL)
610 return 1;
611 size = 0;
612 skip = 0;
613 option_flags = 0;
614 pnp_add_card_device(card, dev);
615 } else {
616 skip = 1;
617 }
618 compat = 0;
619 break;
620 case _STAG_COMPATDEVID:
621 if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
622 isapnp_peek(tmp, 4);
623 eisa_id = tmp[0] | tmp[1] << 8 |
624 tmp[2] << 16 | tmp[3] << 24;
625 pnp_eisa_id_to_string(eisa_id, id);
626 pnp_add_id(dev, id);
627 compat++;
628 size = 0;
629 }
630 break;
631 case _STAG_IRQ:
632 if (size < 2 || size > 3)
633 goto __skip;
634 isapnp_parse_irq_resource(dev, option_flags, size);
635 size = 0;
636 break;
637 case _STAG_DMA:
638 if (size != 2)
639 goto __skip;
640 isapnp_parse_dma_resource(dev, option_flags, size);
641 size = 0;
642 break;
643 case _STAG_STARTDEP:
644 if (size > 1)
645 goto __skip;
646 priority = PNP_RES_PRIORITY_ACCEPTABLE;
647 if (size > 0) {
648 isapnp_peek(tmp, size);
649 priority = tmp[0];
650 size = 0;
651 }
652 option_flags = pnp_new_dependent_set(dev, priority);
653 break;
654 case _STAG_ENDDEP:
655 if (size != 0)
656 goto __skip;
657 option_flags = 0;
658 break;
659 case _STAG_IOPORT:
660 if (size != 7)
661 goto __skip;
662 isapnp_parse_port_resource(dev, option_flags, size);
663 size = 0;
664 break;
665 case _STAG_FIXEDIO:
666 if (size != 3)
667 goto __skip;
668 isapnp_parse_fixed_port_resource(dev, option_flags,
669 size);
670 size = 0;
671 break;
672 case _STAG_VENDOR:
673 break;
674 case _LTAG_MEMRANGE:
675 if (size != 9)
676 goto __skip;
677 isapnp_parse_mem_resource(dev, option_flags, size);
678 size = 0;
679 break;
680 case _LTAG_ANSISTR:
681 isapnp_parse_name(dev->name, sizeof(dev->name), &size);
682 break;
683 case _LTAG_UNICODESTR:
684 /* silently ignore */
685 /* who use unicode for hardware identification? */
686 break;
687 case _LTAG_VENDOR:
688 break;
689 case _LTAG_MEM32RANGE:
690 if (size != 17)
691 goto __skip;
692 isapnp_parse_mem32_resource(dev, option_flags, size);
693 size = 0;
694 break;
695 case _LTAG_FIXEDMEM32RANGE:
696 if (size != 9)
697 goto __skip;
698 isapnp_parse_fixed_mem32_resource(dev, option_flags,
699 size);
700 size = 0;
701 break;
702 case _STAG_END:
703 if (size > 0)
704 isapnp_skip_bytes(size);
705 return 1;
706 default:
707 dev_err(&dev->dev, "unknown tag %#x (card %i), "
708 "ignored\n", type, card->number);
709 }
710 __skip:
711 if (size > 0)
712 isapnp_skip_bytes(size);
713 }
714 return 0;
715 }
716
717 /*
718 * Parse resource map for ISA PnP card.
719 */
isapnp_parse_resource_map(struct pnp_card * card)720 static void __init isapnp_parse_resource_map(struct pnp_card *card)
721 {
722 unsigned char type, tmp[17];
723 unsigned short size;
724
725 while (1) {
726 if (isapnp_read_tag(&type, &size) < 0)
727 return;
728 switch (type) {
729 case _STAG_PNPVERNO:
730 if (size != 2)
731 goto __skip;
732 isapnp_peek(tmp, 2);
733 card->pnpver = tmp[0];
734 card->productver = tmp[1];
735 size = 0;
736 break;
737 case _STAG_LOGDEVID:
738 if (size >= 5 && size <= 6) {
739 if (isapnp_create_device(card, size) == 1)
740 return;
741 size = 0;
742 }
743 break;
744 case _STAG_VENDOR:
745 break;
746 case _LTAG_ANSISTR:
747 isapnp_parse_name(card->name, sizeof(card->name),
748 &size);
749 break;
750 case _LTAG_UNICODESTR:
751 /* silently ignore */
752 /* who use unicode for hardware identification? */
753 break;
754 case _LTAG_VENDOR:
755 break;
756 case _STAG_END:
757 if (size > 0)
758 isapnp_skip_bytes(size);
759 return;
760 default:
761 dev_err(&card->dev, "unknown tag %#x, ignored\n",
762 type);
763 }
764 __skip:
765 if (size > 0)
766 isapnp_skip_bytes(size);
767 }
768 }
769
770 /*
771 * Compute ISA PnP checksum for first eight bytes.
772 */
isapnp_checksum(unsigned char * data)773 static unsigned char __init isapnp_checksum(unsigned char *data)
774 {
775 int i, j;
776 unsigned char checksum = 0x6a, bit, b;
777
778 for (i = 0; i < 8; i++) {
779 b = data[i];
780 for (j = 0; j < 8; j++) {
781 bit = 0;
782 if (b & (1 << j))
783 bit = 1;
784 checksum =
785 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
786 | (checksum >> 1);
787 }
788 }
789 return checksum;
790 }
791
792 /*
793 * Build device list for all present ISA PnP devices.
794 */
isapnp_build_device_list(void)795 static int __init isapnp_build_device_list(void)
796 {
797 int csn;
798 unsigned char header[9], checksum;
799 struct pnp_card *card;
800 u32 eisa_id;
801 char id[8];
802
803 isapnp_wait();
804 isapnp_key();
805 for (csn = 1; csn <= isapnp_csn_count; csn++) {
806 isapnp_wake(csn);
807 isapnp_peek(header, 9);
808 checksum = isapnp_checksum(header);
809 eisa_id = header[0] | header[1] << 8 |
810 header[2] << 16 | header[3] << 24;
811 pnp_eisa_id_to_string(eisa_id, id);
812 card = pnp_alloc_card(&isapnp_protocol, csn, id);
813 if (!card)
814 continue;
815
816 #if 0
817 dev_info(&card->dev,
818 "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
819 header[0], header[1], header[2], header[3], header[4],
820 header[5], header[6], header[7], header[8]);
821 dev_info(&card->dev, "checksum = %#x\n", checksum);
822 #endif
823 INIT_LIST_HEAD(&card->devices);
824 card->serial =
825 (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
826 header[4];
827 isapnp_checksum_value = 0x00;
828 isapnp_parse_resource_map(card);
829 if (isapnp_checksum_value != 0x00)
830 dev_err(&card->dev, "invalid checksum %#x\n",
831 isapnp_checksum_value);
832 card->checksum = isapnp_checksum_value;
833
834 pnp_add_card(card);
835 }
836 isapnp_wait();
837 return 0;
838 }
839
840 /*
841 * Basic configuration routines.
842 */
843
isapnp_present(void)844 int isapnp_present(void)
845 {
846 struct pnp_card *card;
847
848 pnp_for_each_card(card) {
849 if (card->protocol == &isapnp_protocol)
850 return 1;
851 }
852 return 0;
853 }
854
isapnp_cfg_begin(int csn,int logdev)855 int isapnp_cfg_begin(int csn, int logdev)
856 {
857 if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
858 return -EINVAL;
859 mutex_lock(&isapnp_cfg_mutex);
860 isapnp_wait();
861 isapnp_key();
862 isapnp_wake(csn);
863 #if 0
864 /* to avoid malfunction when the isapnptools package is used */
865 /* we must set RDP to our value again */
866 /* it is possible to set RDP only in the isolation phase */
867 /* Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
868 isapnp_write_byte(0x02, 0x04); /* clear CSN of card */
869 mdelay(2); /* is this necessary? */
870 isapnp_wake(csn); /* bring card into sleep state */
871 isapnp_wake(0); /* bring card into isolation state */
872 isapnp_set_rdp(); /* reset the RDP port */
873 udelay(1000); /* delay 1000us */
874 isapnp_write_byte(0x06, csn); /* reset CSN to previous value */
875 udelay(250); /* is this necessary? */
876 #endif
877 if (logdev >= 0)
878 isapnp_device(logdev);
879 return 0;
880 }
881
isapnp_cfg_end(void)882 int isapnp_cfg_end(void)
883 {
884 isapnp_wait();
885 mutex_unlock(&isapnp_cfg_mutex);
886 return 0;
887 }
888
889 /*
890 * Initialization.
891 */
892
893 EXPORT_SYMBOL(isapnp_protocol);
894 EXPORT_SYMBOL(isapnp_present);
895 EXPORT_SYMBOL(isapnp_cfg_begin);
896 EXPORT_SYMBOL(isapnp_cfg_end);
897 EXPORT_SYMBOL(isapnp_write_byte);
898
isapnp_get_resources(struct pnp_dev * dev)899 static int isapnp_get_resources(struct pnp_dev *dev)
900 {
901 int i, ret;
902
903 pnp_dbg(&dev->dev, "get resources\n");
904 pnp_init_resources(dev);
905 isapnp_cfg_begin(dev->card->number, dev->number);
906 dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
907 if (!dev->active)
908 goto __end;
909
910 for (i = 0; i < ISAPNP_MAX_PORT; i++) {
911 ret = isapnp_read_word(ISAPNP_CFG_PORT + (i << 1));
912 pnp_add_io_resource(dev, ret, ret,
913 ret == 0 ? IORESOURCE_DISABLED : 0);
914 }
915 for (i = 0; i < ISAPNP_MAX_MEM; i++) {
916 ret = isapnp_read_word(ISAPNP_CFG_MEM + (i << 3)) << 8;
917 pnp_add_mem_resource(dev, ret, ret,
918 ret == 0 ? IORESOURCE_DISABLED : 0);
919 }
920 for (i = 0; i < ISAPNP_MAX_IRQ; i++) {
921 ret = isapnp_read_word(ISAPNP_CFG_IRQ + (i << 1)) >> 8;
922 pnp_add_irq_resource(dev, ret,
923 ret == 0 ? IORESOURCE_DISABLED : 0);
924 }
925 for (i = 0; i < ISAPNP_MAX_DMA; i++) {
926 ret = isapnp_read_byte(ISAPNP_CFG_DMA + i);
927 pnp_add_dma_resource(dev, ret,
928 ret == 4 ? IORESOURCE_DISABLED : 0);
929 }
930
931 __end:
932 isapnp_cfg_end();
933 return 0;
934 }
935
isapnp_set_resources(struct pnp_dev * dev)936 static int isapnp_set_resources(struct pnp_dev *dev)
937 {
938 struct resource *res;
939 int tmp;
940
941 pnp_dbg(&dev->dev, "set resources\n");
942 isapnp_cfg_begin(dev->card->number, dev->number);
943 dev->active = 1;
944 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
945 res = pnp_get_resource(dev, IORESOURCE_IO, tmp);
946 if (pnp_resource_enabled(res)) {
947 pnp_dbg(&dev->dev, " set io %d to %#llx\n",
948 tmp, (unsigned long long) res->start);
949 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
950 res->start);
951 }
952 }
953 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
954 res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp);
955 if (pnp_resource_enabled(res)) {
956 int irq = res->start;
957 if (irq == 2)
958 irq = 9;
959 pnp_dbg(&dev->dev, " set irq %d to %d\n", tmp, irq);
960 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
961 }
962 }
963 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
964 res = pnp_get_resource(dev, IORESOURCE_DMA, tmp);
965 if (pnp_resource_enabled(res)) {
966 pnp_dbg(&dev->dev, " set dma %d to %lld\n",
967 tmp, (unsigned long long) res->start);
968 isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start);
969 }
970 }
971 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
972 res = pnp_get_resource(dev, IORESOURCE_MEM, tmp);
973 if (pnp_resource_enabled(res)) {
974 pnp_dbg(&dev->dev, " set mem %d to %#llx\n",
975 tmp, (unsigned long long) res->start);
976 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
977 (res->start >> 8) & 0xffff);
978 }
979 }
980 /* FIXME: We aren't handling 32bit mems properly here */
981 isapnp_activate(dev->number);
982 isapnp_cfg_end();
983 return 0;
984 }
985
isapnp_disable_resources(struct pnp_dev * dev)986 static int isapnp_disable_resources(struct pnp_dev *dev)
987 {
988 if (!dev->active)
989 return -EINVAL;
990 isapnp_cfg_begin(dev->card->number, dev->number);
991 isapnp_deactivate(dev->number);
992 dev->active = 0;
993 isapnp_cfg_end();
994 return 0;
995 }
996
997 struct pnp_protocol isapnp_protocol = {
998 .name = "ISA Plug and Play",
999 .get = isapnp_get_resources,
1000 .set = isapnp_set_resources,
1001 .disable = isapnp_disable_resources,
1002 };
1003
isapnp_init(void)1004 static int __init isapnp_init(void)
1005 {
1006 int cards;
1007 struct pnp_card *card;
1008 struct pnp_dev *dev;
1009
1010 if (isapnp_disable) {
1011 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1012 return 0;
1013 }
1014 #ifdef CONFIG_PPC
1015 if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1016 return -EINVAL;
1017 #endif
1018 #ifdef ISAPNP_REGION_OK
1019 if (!request_region(_PIDXR, 1, "isapnp index")) {
1020 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1021 _PIDXR);
1022 return -EBUSY;
1023 }
1024 #endif
1025 if (!request_region(_PNPWRP, 1, "isapnp write")) {
1026 printk(KERN_ERR
1027 "isapnp: Write Data Register 0x%x already used\n",
1028 _PNPWRP);
1029 #ifdef ISAPNP_REGION_OK
1030 release_region(_PIDXR, 1);
1031 #endif
1032 return -EBUSY;
1033 }
1034
1035 if (pnp_register_protocol(&isapnp_protocol) < 0)
1036 return -EBUSY;
1037
1038 /*
1039 * Print a message. The existing ISAPnP code is hanging machines
1040 * so let the user know where.
1041 */
1042
1043 printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1044 if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1045 isapnp_rdp |= 3;
1046 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1047 printk(KERN_ERR
1048 "isapnp: Read Data Register 0x%x already used\n",
1049 isapnp_rdp);
1050 #ifdef ISAPNP_REGION_OK
1051 release_region(_PIDXR, 1);
1052 #endif
1053 release_region(_PNPWRP, 1);
1054 return -EBUSY;
1055 }
1056 isapnp_set_rdp();
1057 }
1058 if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1059 cards = isapnp_isolate();
1060 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1061 #ifdef ISAPNP_REGION_OK
1062 release_region(_PIDXR, 1);
1063 #endif
1064 release_region(_PNPWRP, 1);
1065 printk(KERN_INFO
1066 "isapnp: No Plug & Play device found\n");
1067 return 0;
1068 }
1069 request_region(isapnp_rdp, 1, "isapnp read");
1070 }
1071 isapnp_build_device_list();
1072 cards = 0;
1073
1074 protocol_for_each_card(&isapnp_protocol, card) {
1075 cards++;
1076 if (isapnp_verbose) {
1077 dev_info(&card->dev, "card '%s'\n",
1078 card->name[0] ? card->name : "unknown");
1079 if (isapnp_verbose < 2)
1080 continue;
1081 card_for_each_dev(card, dev) {
1082 dev_info(&card->dev, "device '%s'\n",
1083 dev->name[0] ? dev->name : "unknown");
1084 }
1085 }
1086 }
1087 if (cards)
1088 printk(KERN_INFO
1089 "isapnp: %i Plug & Play card%s detected total\n", cards,
1090 cards > 1 ? "s" : "");
1091 else
1092 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1093
1094 isapnp_proc_init();
1095 return 0;
1096 }
1097
1098 device_initcall(isapnp_init);
1099
1100 /* format is: noisapnp */
1101
isapnp_setup_disable(char * str)1102 static int __init isapnp_setup_disable(char *str)
1103 {
1104 isapnp_disable = 1;
1105 return 1;
1106 }
1107
1108 __setup("noisapnp", isapnp_setup_disable);
1109
1110 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1111
isapnp_setup_isapnp(char * str)1112 static int __init isapnp_setup_isapnp(char *str)
1113 {
1114 (void)((get_option(&str, &isapnp_rdp) == 2) &&
1115 (get_option(&str, &isapnp_reset) == 2) &&
1116 (get_option(&str, &isapnp_verbose) == 2));
1117 return 1;
1118 }
1119
1120 __setup("isapnp=", isapnp_setup_isapnp);
1121