1 /*
2 * ISA Plug & Play support
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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/config.h>
38 #include <linux/module.h>
39 #include <linux/kernel.h>
40 #include <linux/errno.h>
41 #include <linux/slab.h>
42 #include <linux/delay.h>
43 #include <linux/init.h>
44 #include <linux/isapnp.h>
45 #include <asm/io.h>
46
47 #if 0
48 #define ISAPNP_REGION_OK
49 #endif
50 #if 0
51 #define ISAPNP_DEBUG
52 #endif
53
54 int isapnp_disable; /* Disable ISA PnP */
55 int isapnp_rdp; /* Read Data Port */
56 int isapnp_reset = 1; /* reset all PnP cards (deactivate) */
57 int isapnp_verbose = 1; /* verbose mode */
58
59 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
60 MODULE_DESCRIPTION("Generic ISA Plug & Play support");
61 module_param(isapnp_disable, int, 0);
62 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable");
63 module_param(isapnp_rdp, int, 0);
64 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
65 module_param(isapnp_reset, int, 0);
66 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
67 module_param(isapnp_verbose, int, 0);
68 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
69 MODULE_LICENSE("GPL");
70
71 #define _PIDXR 0x279
72 #define _PNPWRP 0xa79
73
74 /* short tags */
75 #define _STAG_PNPVERNO 0x01
76 #define _STAG_LOGDEVID 0x02
77 #define _STAG_COMPATDEVID 0x03
78 #define _STAG_IRQ 0x04
79 #define _STAG_DMA 0x05
80 #define _STAG_STARTDEP 0x06
81 #define _STAG_ENDDEP 0x07
82 #define _STAG_IOPORT 0x08
83 #define _STAG_FIXEDIO 0x09
84 #define _STAG_VENDOR 0x0e
85 #define _STAG_END 0x0f
86 /* long tags */
87 #define _LTAG_MEMRANGE 0x81
88 #define _LTAG_ANSISTR 0x82
89 #define _LTAG_UNICODESTR 0x83
90 #define _LTAG_VENDOR 0x84
91 #define _LTAG_MEM32RANGE 0x85
92 #define _LTAG_FIXEDMEM32RANGE 0x86
93
94 static unsigned char isapnp_checksum_value;
95 static DECLARE_MUTEX(isapnp_cfg_mutex);
96 static int isapnp_detected;
97 static int isapnp_csn_count;
98
99 /* some prototypes */
100
101 static inline void write_data(unsigned char x)
102 {
103 outb(x, _PNPWRP);
104 }
105
106 static inline void write_address(unsigned char x)
107 {
108 outb(x, _PIDXR);
109 udelay(20);
110 }
111
112 static inline unsigned char read_data(void)
113 {
114 unsigned char val = inb(isapnp_rdp);
115 return val;
116 }
117
118 unsigned char isapnp_read_byte(unsigned char idx)
119 {
120 write_address(idx);
121 return read_data();
122 }
123
124 unsigned short isapnp_read_word(unsigned char idx)
125 {
126 unsigned short val;
127
128 val = isapnp_read_byte(idx);
129 val = (val << 8) + isapnp_read_byte(idx+1);
130 return val;
131 }
132
133 unsigned int isapnp_read_dword(unsigned char idx)
134 {
135 unsigned int val;
136
137 val = isapnp_read_byte(idx);
138 val = (val << 8) + isapnp_read_byte(idx+1);
139 val = (val << 8) + isapnp_read_byte(idx+2);
140 val = (val << 8) + isapnp_read_byte(idx+3);
141 return val;
142 }
143
144 void isapnp_write_byte(unsigned char idx, unsigned char val)
145 {
146 write_address(idx);
147 write_data(val);
148 }
149
150 void isapnp_write_word(unsigned char idx, unsigned short val)
151 {
152 isapnp_write_byte(idx, val >> 8);
153 isapnp_write_byte(idx+1, val);
154 }
155
156 void isapnp_write_dword(unsigned char idx, unsigned int val)
157 {
158 isapnp_write_byte(idx, val >> 24);
159 isapnp_write_byte(idx+1, val >> 16);
160 isapnp_write_byte(idx+2, val >> 8);
161 isapnp_write_byte(idx+3, val);
162 }
163
164 void *isapnp_alloc(long size)
165 {
166 void *result;
167
168 result = kmalloc(size, GFP_KERNEL);
169 if (!result)
170 return NULL;
171 memset(result, 0, size);
172 return result;
173 }
174
175 static void isapnp_key(void)
176 {
177 unsigned char code = 0x6a, msb;
178 int i;
179
180 mdelay(1);
181 write_address(0x00);
182 write_address(0x00);
183
184 write_address(code);
185
186 for (i = 1; i < 32; i++) {
187 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
188 code = (code >> 1) | msb;
189 write_address(code);
190 }
191 }
192
193 /* place all pnp cards in wait-for-key state */
194 static void isapnp_wait(void)
195 {
196 isapnp_write_byte(0x02, 0x02);
197 }
198
199 void isapnp_wake(unsigned char csn)
200 {
201 isapnp_write_byte(0x03, csn);
202 }
203
204 void isapnp_device(unsigned char logdev)
205 {
206 isapnp_write_byte(0x07, logdev);
207 }
208
209 void isapnp_activate(unsigned char logdev)
210 {
211 isapnp_device(logdev);
212 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
213 udelay(250);
214 }
215
216 void isapnp_deactivate(unsigned char logdev)
217 {
218 isapnp_device(logdev);
219 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
220 udelay(500);
221 }
222
223 static void __init isapnp_peek(unsigned char *data, int bytes)
224 {
225 int i, j;
226 unsigned char d=0;
227
228 for (i = 1; i <= bytes; i++) {
229 for (j = 0; j < 20; j++) {
230 d = isapnp_read_byte(0x05);
231 if (d & 1)
232 break;
233 udelay(100);
234 }
235 if (!(d & 1)) {
236 if (data != NULL)
237 *data++ = 0xff;
238 continue;
239 }
240 d = isapnp_read_byte(0x04); /* PRESDI */
241 isapnp_checksum_value += d;
242 if (data != NULL)
243 *data++ = d;
244 }
245 }
246
247 #define RDP_STEP 32 /* minimum is 4 */
248
249 static int isapnp_next_rdp(void)
250 {
251 int rdp = isapnp_rdp;
252 static int old_rdp = 0;
253
254 if(old_rdp)
255 {
256 release_region(old_rdp, 1);
257 old_rdp = 0;
258 }
259 while (rdp <= 0x3ff) {
260 /*
261 * We cannot use NE2000 probe spaces for ISAPnP or we
262 * will lock up machines.
263 */
264 if ((rdp < 0x280 || rdp > 0x380) && request_region(rdp, 1, "ISAPnP"))
265 {
266 isapnp_rdp = rdp;
267 old_rdp = rdp;
268 return 0;
269 }
270 rdp += RDP_STEP;
271 }
272 return -1;
273 }
274
275 /* Set read port address */
276 static inline void isapnp_set_rdp(void)
277 {
278 isapnp_write_byte(0x00, isapnp_rdp >> 2);
279 udelay(100);
280 }
281
282 /*
283 * Perform an isolation. The port selection code now tries to avoid
284 * "dangerous to read" ports.
285 */
286
287 static int __init isapnp_isolate_rdp_select(void)
288 {
289 isapnp_wait();
290 isapnp_key();
291
292 /* Control: reset CSN and conditionally everything else too */
293 isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
294 mdelay(2);
295
296 isapnp_wait();
297 isapnp_key();
298 isapnp_wake(0x00);
299
300 if (isapnp_next_rdp() < 0) {
301 isapnp_wait();
302 return -1;
303 }
304
305 isapnp_set_rdp();
306 udelay(1000);
307 write_address(0x01);
308 udelay(1000);
309 return 0;
310 }
311
312 /*
313 * Isolate (assign uniqued CSN) to all ISA PnP devices.
314 */
315
316 static int __init isapnp_isolate(void)
317 {
318 unsigned char checksum = 0x6a;
319 unsigned char chksum = 0x00;
320 unsigned char bit = 0x00;
321 int data;
322 int csn = 0;
323 int i;
324 int iteration = 1;
325
326 isapnp_rdp = 0x213;
327 if (isapnp_isolate_rdp_select() < 0)
328 return -1;
329
330 while (1) {
331 for (i = 1; i <= 64; i++) {
332 data = read_data() << 8;
333 udelay(250);
334 data = data | read_data();
335 udelay(250);
336 if (data == 0x55aa)
337 bit = 0x01;
338 checksum = ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) | (checksum >> 1);
339 bit = 0x00;
340 }
341 for (i = 65; i <= 72; i++) {
342 data = read_data() << 8;
343 udelay(250);
344 data = data | read_data();
345 udelay(250);
346 if (data == 0x55aa)
347 chksum |= (1 << (i - 65));
348 }
349 if (checksum != 0x00 && checksum == chksum) {
350 csn++;
351
352 isapnp_write_byte(0x06, csn);
353 udelay(250);
354 iteration++;
355 isapnp_wake(0x00);
356 isapnp_set_rdp();
357 udelay(1000);
358 write_address(0x01);
359 udelay(1000);
360 goto __next;
361 }
362 if (iteration == 1) {
363 isapnp_rdp += RDP_STEP;
364 if (isapnp_isolate_rdp_select() < 0)
365 return -1;
366 } else if (iteration > 1) {
367 break;
368 }
369 __next:
370 if (csn == 255)
371 break;
372 checksum = 0x6a;
373 chksum = 0x00;
374 bit = 0x00;
375 }
376 isapnp_wait();
377 isapnp_csn_count = csn;
378 return csn;
379 }
380
381 /*
382 * Read one tag from stream.
383 */
384
385 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
386 {
387 unsigned char tag, tmp[2];
388
389 isapnp_peek(&tag, 1);
390 if (tag == 0) /* invalid tag */
391 return -1;
392 if (tag & 0x80) { /* large item */
393 *type = tag;
394 isapnp_peek(tmp, 2);
395 *size = (tmp[1] << 8) | tmp[0];
396 } else {
397 *type = (tag >> 3) & 0x0f;
398 *size = tag & 0x07;
399 }
400 #if 0
401 printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type, *size);
402 #endif
403 if (type == 0) /* wrong type */
404 return -1;
405 if (*type == 0xff && *size == 0xffff) /* probably invalid data */
406 return -1;
407 return 0;
408 }
409
410 /*
411 * Skip specified number of bytes from stream.
412 */
413
414 static void __init isapnp_skip_bytes(int count)
415 {
416 isapnp_peek(NULL, count);
417 }
418
419 /*
420 * Parse EISA id.
421 */
422
423 static void isapnp_parse_id(struct pnp_dev * dev, unsigned short vendor, unsigned short device)
424 {
425 struct pnp_id * id;
426 if (!dev)
427 return;
428 id = isapnp_alloc(sizeof(struct pnp_id));
429 if (!id)
430 return;
431 sprintf(id->id, "%c%c%c%x%x%x%x",
432 'A' + ((vendor >> 2) & 0x3f) - 1,
433 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
434 'A' + ((vendor >> 8) & 0x1f) - 1,
435 (device >> 4) & 0x0f,
436 device & 0x0f,
437 (device >> 12) & 0x0f,
438 (device >> 8) & 0x0f);
439 pnp_add_id(id, dev);
440 }
441
442 /*
443 * Parse logical device tag.
444 */
445
446 static struct pnp_dev * __init isapnp_parse_device(struct pnp_card *card, int size, int number)
447 {
448 unsigned char tmp[6];
449 struct pnp_dev *dev;
450
451 isapnp_peek(tmp, size);
452 dev = isapnp_alloc(sizeof(struct pnp_dev));
453 if (!dev)
454 return NULL;
455 dev->number = number;
456 isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0], (tmp[3] << 8) | tmp[2]);
457 dev->regs = tmp[4];
458 dev->card = card;
459 if (size > 5)
460 dev->regs |= tmp[5] << 8;
461 dev->protocol = &isapnp_protocol;
462 dev->capabilities |= PNP_CONFIGURABLE;
463 dev->capabilities |= PNP_READ;
464 dev->capabilities |= PNP_WRITE;
465 dev->capabilities |= PNP_DISABLE;
466 pnp_init_resource_table(&dev->res);
467 return dev;
468 }
469
470
471 /*
472 * Add IRQ resource to resources list.
473 */
474
475 static void __init isapnp_parse_irq_resource(struct pnp_option *option,
476 int size)
477 {
478 unsigned char tmp[3];
479 struct pnp_irq *irq;
480 unsigned long bits;
481
482 isapnp_peek(tmp, size);
483 irq = isapnp_alloc(sizeof(struct pnp_irq));
484 if (!irq)
485 return;
486 bits = (tmp[1] << 8) | tmp[0];
487 bitmap_copy(irq->map, &bits, 16);
488 if (size > 2)
489 irq->flags = tmp[2];
490 else
491 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
492 pnp_register_irq_resource(option, irq);
493 return;
494 }
495
496 /*
497 * Add DMA resource to resources list.
498 */
499
500 static void __init isapnp_parse_dma_resource(struct pnp_option *option,
501 int size)
502 {
503 unsigned char tmp[2];
504 struct pnp_dma *dma;
505
506 isapnp_peek(tmp, size);
507 dma = isapnp_alloc(sizeof(struct pnp_dma));
508 if (!dma)
509 return;
510 dma->map = tmp[0];
511 dma->flags = tmp[1];
512 pnp_register_dma_resource(option, dma);
513 return;
514 }
515
516 /*
517 * Add port resource to resources list.
518 */
519
520 static void __init isapnp_parse_port_resource(struct pnp_option *option,
521 int size)
522 {
523 unsigned char tmp[7];
524 struct pnp_port *port;
525
526 isapnp_peek(tmp, size);
527 port = isapnp_alloc(sizeof(struct pnp_port));
528 if (!port)
529 return;
530 port->min = (tmp[2] << 8) | tmp[1];
531 port->max = (tmp[4] << 8) | tmp[3];
532 port->align = tmp[5];
533 port->size = tmp[6];
534 port->flags = tmp[0] ? PNP_PORT_FLAG_16BITADDR : 0;
535 pnp_register_port_resource(option,port);
536 return;
537 }
538
539 /*
540 * Add fixed port resource to resources list.
541 */
542
543 static void __init isapnp_parse_fixed_port_resource(struct pnp_option *option,
544 int size)
545 {
546 unsigned char tmp[3];
547 struct pnp_port *port;
548
549 isapnp_peek(tmp, size);
550 port = isapnp_alloc(sizeof(struct pnp_port));
551 if (!port)
552 return;
553 port->min = port->max = (tmp[1] << 8) | tmp[0];
554 port->size = tmp[2];
555 port->align = 0;
556 port->flags = PNP_PORT_FLAG_FIXED;
557 pnp_register_port_resource(option,port);
558 return;
559 }
560
561 /*
562 * Add memory resource to resources list.
563 */
564
565 static void __init isapnp_parse_mem_resource(struct pnp_option *option,
566 int size)
567 {
568 unsigned char tmp[9];
569 struct pnp_mem *mem;
570
571 isapnp_peek(tmp, size);
572 mem = isapnp_alloc(sizeof(struct pnp_mem));
573 if (!mem)
574 return;
575 mem->min = ((tmp[2] << 8) | tmp[1]) << 8;
576 mem->max = ((tmp[4] << 8) | tmp[3]) << 8;
577 mem->align = (tmp[6] << 8) | tmp[5];
578 mem->size = ((tmp[8] << 8) | tmp[7]) << 8;
579 mem->flags = tmp[0];
580 pnp_register_mem_resource(option,mem);
581 return;
582 }
583
584 /*
585 * Add 32-bit memory resource to resources list.
586 */
587
588 static void __init isapnp_parse_mem32_resource(struct pnp_option *option,
589 int size)
590 {
591 unsigned char tmp[17];
592 struct pnp_mem *mem;
593
594 isapnp_peek(tmp, size);
595 mem = isapnp_alloc(sizeof(struct pnp_mem));
596 if (!mem)
597 return;
598 mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
599 mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
600 mem->align = (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
601 mem->size = (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
602 mem->flags = tmp[0];
603 pnp_register_mem_resource(option,mem);
604 }
605
606 /*
607 * Add 32-bit fixed memory resource to resources list.
608 */
609
610 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_option *option,
611 int size)
612 {
613 unsigned char tmp[9];
614 struct pnp_mem *mem;
615
616 isapnp_peek(tmp, size);
617 mem = isapnp_alloc(sizeof(struct pnp_mem));
618 if (!mem)
619 return;
620 mem->min = mem->max = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
621 mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
622 mem->align = 0;
623 mem->flags = tmp[0];
624 pnp_register_mem_resource(option,mem);
625 }
626
627 /*
628 * Parse card name for ISA PnP device.
629 */
630
631 static void __init
632 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
633 {
634 if (name[0] == '\0') {
635 unsigned short size1 = *size >= name_max ? (name_max - 1) : *size;
636 isapnp_peek(name, size1);
637 name[size1] = '\0';
638 *size -= size1;
639
640 /* clean whitespace from end of string */
641 while (size1 > 0 && name[--size1] == ' ')
642 name[size1] = '\0';
643 }
644 }
645
646 /*
647 * Parse resource map for logical device.
648 */
649
650 static int __init isapnp_create_device(struct pnp_card *card,
651 unsigned short size)
652 {
653 int number = 0, skip = 0, priority = 0, compat = 0;
654 unsigned char type, tmp[17];
655 struct pnp_option *option;
656 struct pnp_dev *dev;
657 if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
658 return 1;
659 option = pnp_register_independent_option(dev);
660 if (!option) {
661 kfree(dev);
662 return 1;
663 }
664 pnp_add_card_device(card,dev);
665
666 while (1) {
667 if (isapnp_read_tag(&type, &size)<0)
668 return 1;
669 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
670 goto __skip;
671 switch (type) {
672 case _STAG_LOGDEVID:
673 if (size >= 5 && size <= 6) {
674 if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
675 return 1;
676 size = 0;
677 skip = 0;
678 option = pnp_register_independent_option(dev);
679 if (!option)
680 return 1;
681 pnp_add_card_device(card,dev);
682 } else {
683 skip = 1;
684 }
685 priority = 0;
686 compat = 0;
687 break;
688 case _STAG_COMPATDEVID:
689 if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
690 isapnp_peek(tmp, 4);
691 isapnp_parse_id(dev,(tmp[1] << 8) | tmp[0], (tmp[3] << 8) | tmp[2]);
692 compat++;
693 size = 0;
694 }
695 break;
696 case _STAG_IRQ:
697 if (size < 2 || size > 3)
698 goto __skip;
699 isapnp_parse_irq_resource(option, size);
700 size = 0;
701 break;
702 case _STAG_DMA:
703 if (size != 2)
704 goto __skip;
705 isapnp_parse_dma_resource(option, size);
706 size = 0;
707 break;
708 case _STAG_STARTDEP:
709 if (size > 1)
710 goto __skip;
711 priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
712 if (size > 0) {
713 isapnp_peek(tmp, size);
714 priority = 0x100 | tmp[0];
715 size = 0;
716 }
717 option = pnp_register_dependent_option(dev,priority);
718 if (!option)
719 return 1;
720 break;
721 case _STAG_ENDDEP:
722 if (size != 0)
723 goto __skip;
724 priority = 0;
725 break;
726 case _STAG_IOPORT:
727 if (size != 7)
728 goto __skip;
729 isapnp_parse_port_resource(option, size);
730 size = 0;
731 break;
732 case _STAG_FIXEDIO:
733 if (size != 3)
734 goto __skip;
735 isapnp_parse_fixed_port_resource(option, size);
736 size = 0;
737 break;
738 case _STAG_VENDOR:
739 break;
740 case _LTAG_MEMRANGE:
741 if (size != 9)
742 goto __skip;
743 isapnp_parse_mem_resource(option, size);
744 size = 0;
745 break;
746 case _LTAG_ANSISTR:
747 isapnp_parse_name(dev->name, sizeof(dev->name), &size);
748 break;
749 case _LTAG_UNICODESTR:
750 /* silently ignore */
751 /* who use unicode for hardware identification? */
752 break;
753 case _LTAG_VENDOR:
754 break;
755 case _LTAG_MEM32RANGE:
756 if (size != 17)
757 goto __skip;
758 isapnp_parse_mem32_resource(option, size);
759 size = 0;
760 break;
761 case _LTAG_FIXEDMEM32RANGE:
762 if (size != 9)
763 goto __skip;
764 isapnp_parse_fixed_mem32_resource(option, size);
765 size = 0;
766 break;
767 case _STAG_END:
768 if (size > 0)
769 isapnp_skip_bytes(size);
770 return 1;
771 default:
772 printk(KERN_ERR "isapnp: unexpected or unknown tag type 0x%x for logical device %i (device %i), ignored\n", type, dev->number, card->number);
773 }
774 __skip:
775 if (size > 0)
776 isapnp_skip_bytes(size);
777 }
778 return 0;
779 }
780
781 /*
782 * Parse resource map for ISA PnP card.
783 */
784
785 static void __init isapnp_parse_resource_map(struct pnp_card *card)
786 {
787 unsigned char type, tmp[17];
788 unsigned short size;
789
790 while (1) {
791 if (isapnp_read_tag(&type, &size)<0)
792 return;
793 switch (type) {
794 case _STAG_PNPVERNO:
795 if (size != 2)
796 goto __skip;
797 isapnp_peek(tmp, 2);
798 card->pnpver = tmp[0];
799 card->productver = tmp[1];
800 size = 0;
801 break;
802 case _STAG_LOGDEVID:
803 if (size >= 5 && size <= 6) {
804 if (isapnp_create_device(card, size)==1)
805 return;
806 size = 0;
807 }
808 break;
809 case _STAG_VENDOR:
810 break;
811 case _LTAG_ANSISTR:
812 isapnp_parse_name(card->name, sizeof(card->name), &size);
813 break;
814 case _LTAG_UNICODESTR:
815 /* silently ignore */
816 /* who use unicode for hardware identification? */
817 break;
818 case _LTAG_VENDOR:
819 break;
820 case _STAG_END:
821 if (size > 0)
822 isapnp_skip_bytes(size);
823 return;
824 default:
825 printk(KERN_ERR "isapnp: unexpected or unknown tag type 0x%x for device %i, ignored\n", type, card->number);
826 }
827 __skip:
828 if (size > 0)
829 isapnp_skip_bytes(size);
830 }
831 }
832
833 /*
834 * Compute ISA PnP checksum for first eight bytes.
835 */
836
837 static unsigned char __init isapnp_checksum(unsigned char *data)
838 {
839 int i, j;
840 unsigned char checksum = 0x6a, bit, b;
841
842 for (i = 0; i < 8; i++) {
843 b = data[i];
844 for (j = 0; j < 8; j++) {
845 bit = 0;
846 if (b & (1 << j))
847 bit = 1;
848 checksum = ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) | (checksum >> 1);
849 }
850 }
851 return checksum;
852 }
853
854 /*
855 * Parse EISA id for ISA PnP card.
856 */
857
858 static void isapnp_parse_card_id(struct pnp_card * card, unsigned short vendor, unsigned short device)
859 {
860 struct pnp_id * id = isapnp_alloc(sizeof(struct pnp_id));
861 if (!id)
862 return;
863 sprintf(id->id, "%c%c%c%x%x%x%x",
864 'A' + ((vendor >> 2) & 0x3f) - 1,
865 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
866 'A' + ((vendor >> 8) & 0x1f) - 1,
867 (device >> 4) & 0x0f,
868 device & 0x0f,
869 (device >> 12) & 0x0f,
870 (device >> 8) & 0x0f);
871 pnp_add_card_id(id,card);
872 }
873
874 /*
875 * Build device list for all present ISA PnP devices.
876 */
877
878 static int __init isapnp_build_device_list(void)
879 {
880 int csn;
881 unsigned char header[9], checksum;
882 struct pnp_card *card;
883
884 isapnp_wait();
885 isapnp_key();
886 for (csn = 1; csn <= isapnp_csn_count; csn++) {
887 isapnp_wake(csn);
888 isapnp_peek(header, 9);
889 checksum = isapnp_checksum(header);
890 #if 0
891 printk(KERN_DEBUG "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
892 header[0], header[1], header[2], header[3],
893 header[4], header[5], header[6], header[7], header[8]);
894 printk(KERN_DEBUG "checksum = 0x%x\n", checksum);
895 #endif
896 if ((card = isapnp_alloc(sizeof(struct pnp_card))) == NULL)
897 continue;
898
899 card->number = csn;
900 INIT_LIST_HEAD(&card->devices);
901 isapnp_parse_card_id(card, (header[1] << 8) | header[0], (header[3] << 8) | header[2]);
902 card->serial = (header[7] << 24) | (header[6] << 16) | (header[5] << 8) | header[4];
903 isapnp_checksum_value = 0x00;
904 isapnp_parse_resource_map(card);
905 if (isapnp_checksum_value != 0x00)
906 printk(KERN_ERR "isapnp: checksum for device %i is not valid (0x%x)\n", csn, isapnp_checksum_value);
907 card->checksum = isapnp_checksum_value;
908 card->protocol = &isapnp_protocol;
909
910 pnp_add_card(card);
911 }
912 isapnp_wait();
913 return 0;
914 }
915
916 /*
917 * Basic configuration routines.
918 */
919
920 int isapnp_present(void)
921 {
922 struct pnp_card *card;
923 pnp_for_each_card(card) {
924 if (card->protocol == &isapnp_protocol)
925 return 1;
926 }
927 return 0;
928 }
929
930 int isapnp_cfg_begin(int csn, int logdev)
931 {
932 if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
933 return -EINVAL;
934 down(&isapnp_cfg_mutex);
935 isapnp_wait();
936 isapnp_key();
937 isapnp_wake(csn);
938 #if 0
939 /* to avoid malfunction when the isapnptools package is used */
940 /* we must set RDP to our value again */
941 /* it is possible to set RDP only in the isolation phase */
942 /* Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
943 isapnp_write_byte(0x02, 0x04); /* clear CSN of card */
944 mdelay(2); /* is this necessary? */
945 isapnp_wake(csn); /* bring card into sleep state */
946 isapnp_wake(0); /* bring card into isolation state */
947 isapnp_set_rdp(); /* reset the RDP port */
948 udelay(1000); /* delay 1000us */
949 isapnp_write_byte(0x06, csn); /* reset CSN to previous value */
950 udelay(250); /* is this necessary? */
951 #endif
952 if (logdev >= 0)
953 isapnp_device(logdev);
954 return 0;
955 }
956
957 int isapnp_cfg_end(void)
958 {
959 isapnp_wait();
960 up(&isapnp_cfg_mutex);
961 return 0;
962 }
963
964
965 /*
966 * Inititialization.
967 */
968
969
970 EXPORT_SYMBOL(isapnp_protocol);
971 EXPORT_SYMBOL(isapnp_present);
972 EXPORT_SYMBOL(isapnp_cfg_begin);
973 EXPORT_SYMBOL(isapnp_cfg_end);
974 EXPORT_SYMBOL(isapnp_read_byte);
975 EXPORT_SYMBOL(isapnp_read_word);
976 EXPORT_SYMBOL(isapnp_read_dword);
977 EXPORT_SYMBOL(isapnp_write_byte);
978 EXPORT_SYMBOL(isapnp_write_word);
979 EXPORT_SYMBOL(isapnp_write_dword);
980 EXPORT_SYMBOL(isapnp_wake);
981 EXPORT_SYMBOL(isapnp_device);
982
983 static int isapnp_read_resources(struct pnp_dev *dev, struct pnp_resource_table *res)
984 {
985 int tmp, ret;
986
987 dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
988 if (dev->active) {
989 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
990 ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
991 if (!ret)
992 continue;
993 res->port_resource[tmp].start = ret;
994 res->port_resource[tmp].flags = IORESOURCE_IO;
995 }
996 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
997 ret = isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
998 if (!ret)
999 continue;
1000 res->mem_resource[tmp].start = ret;
1001 res->mem_resource[tmp].flags = IORESOURCE_MEM;
1002 }
1003 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
1004 ret = (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >> 8);
1005 if (!ret)
1006 continue;
1007 res->irq_resource[tmp].start = res->irq_resource[tmp].end = ret;
1008 res->irq_resource[tmp].flags = IORESOURCE_IRQ;
1009 }
1010 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
1011 ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
1012 if (ret == 4)
1013 continue;
1014 res->dma_resource[tmp].start = res->dma_resource[tmp].end = ret;
1015 res->dma_resource[tmp].flags = IORESOURCE_DMA;
1016 }
1017 }
1018 return 0;
1019 }
1020
1021 static int isapnp_get_resources(struct pnp_dev *dev, struct pnp_resource_table * res)
1022 {
1023 int ret;
1024 pnp_init_resource_table(res);
1025 isapnp_cfg_begin(dev->card->number, dev->number);
1026 ret = isapnp_read_resources(dev, res);
1027 isapnp_cfg_end();
1028 return ret;
1029 }
1030
1031 static int isapnp_set_resources(struct pnp_dev *dev, struct pnp_resource_table * res)
1032 {
1033 int tmp;
1034
1035 isapnp_cfg_begin(dev->card->number, dev->number);
1036 dev->active = 1;
1037 for (tmp = 0; tmp < PNP_MAX_PORT && (res->port_resource[tmp].flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO; tmp++)
1038 isapnp_write_word(ISAPNP_CFG_PORT+(tmp<<1), res->port_resource[tmp].start);
1039 for (tmp = 0; tmp < PNP_MAX_IRQ && (res->irq_resource[tmp].flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ; tmp++) {
1040 int irq = res->irq_resource[tmp].start;
1041 if (irq == 2)
1042 irq = 9;
1043 isapnp_write_byte(ISAPNP_CFG_IRQ+(tmp<<1), irq);
1044 }
1045 for (tmp = 0; tmp < PNP_MAX_DMA && (res->dma_resource[tmp].flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA; tmp++)
1046 isapnp_write_byte(ISAPNP_CFG_DMA+tmp, res->dma_resource[tmp].start);
1047 for (tmp = 0; tmp < PNP_MAX_MEM && (res->mem_resource[tmp].flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM; tmp++)
1048 isapnp_write_word(ISAPNP_CFG_MEM+(tmp<<3), (res->mem_resource[tmp].start >> 8) & 0xffff);
1049 /* FIXME: We aren't handling 32bit mems properly here */
1050 isapnp_activate(dev->number);
1051 isapnp_cfg_end();
1052 return 0;
1053 }
1054
1055 static int isapnp_disable_resources(struct pnp_dev *dev)
1056 {
1057 if (!dev || !dev->active)
1058 return -EINVAL;
1059 isapnp_cfg_begin(dev->card->number, dev->number);
1060 isapnp_deactivate(dev->number);
1061 dev->active = 0;
1062 isapnp_cfg_end();
1063 return 0;
1064 }
1065
1066 struct pnp_protocol isapnp_protocol = {
1067 .name = "ISA Plug and Play",
1068 .get = isapnp_get_resources,
1069 .set = isapnp_set_resources,
1070 .disable = isapnp_disable_resources,
1071 };
1072
1073 int __init isapnp_init(void)
1074 {
1075 int cards;
1076 struct pnp_card *card;
1077 struct pnp_dev *dev;
1078
1079 if (isapnp_disable) {
1080 isapnp_detected = 0;
1081 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1082 return 0;
1083 }
1084 #ifdef ISAPNP_REGION_OK
1085 if (!request_region(_PIDXR, 1, "isapnp index")) {
1086 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n", _PIDXR);
1087 return -EBUSY;
1088 }
1089 #endif
1090 if (!request_region(_PNPWRP, 1, "isapnp write")) {
1091 printk(KERN_ERR "isapnp: Write Data Register 0x%x already used\n", _PNPWRP);
1092 #ifdef ISAPNP_REGION_OK
1093 release_region(_PIDXR, 1);
1094 #endif
1095 return -EBUSY;
1096 }
1097
1098 if(pnp_register_protocol(&isapnp_protocol)<0)
1099 return -EBUSY;
1100
1101 /*
1102 * Print a message. The existing ISAPnP code is hanging machines
1103 * so let the user know where.
1104 */
1105
1106 printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1107 if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1108 isapnp_rdp |= 3;
1109 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1110 printk(KERN_ERR "isapnp: Read Data Register 0x%x already used\n", isapnp_rdp);
1111 #ifdef ISAPNP_REGION_OK
1112 release_region(_PIDXR, 1);
1113 #endif
1114 release_region(_PNPWRP, 1);
1115 return -EBUSY;
1116 }
1117 isapnp_set_rdp();
1118 }
1119 isapnp_detected = 1;
1120 if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1121 cards = isapnp_isolate();
1122 if (cards < 0 ||
1123 (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1124 #ifdef ISAPNP_REGION_OK
1125 release_region(_PIDXR, 1);
1126 #endif
1127 release_region(_PNPWRP, 1);
1128 isapnp_detected = 0;
1129 printk(KERN_INFO "isapnp: No Plug & Play device found\n");
1130 return 0;
1131 }
1132 request_region(isapnp_rdp, 1, "isapnp read");
1133 }
1134 isapnp_build_device_list();
1135 cards = 0;
1136
1137 protocol_for_each_card(&isapnp_protocol,card) {
1138 cards++;
1139 if (isapnp_verbose) {
1140 printk(KERN_INFO "isapnp: Card '%s'\n", card->name[0]?card->name:"Unknown");
1141 if (isapnp_verbose < 2)
1142 continue;
1143 card_for_each_dev(card,dev) {
1144 printk(KERN_INFO "isapnp: Device '%s'\n", dev->name[0]?dev->name:"Unknown");
1145 }
1146 }
1147 }
1148 if (cards) {
1149 printk(KERN_INFO "isapnp: %i Plug & Play card%s detected total\n", cards, cards>1?"s":"");
1150 } else {
1151 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1152 }
1153
1154 isapnp_proc_init();
1155 return 0;
1156 }
1157
1158 device_initcall(isapnp_init);
1159
1160 /* format is: noisapnp */
1161
1162 static int __init isapnp_setup_disable(char *str)
1163 {
1164 isapnp_disable = 1;
1165 return 1;
1166 }
1167
1168 __setup("noisapnp", isapnp_setup_disable);
1169
1170 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1171
1172 static int __init isapnp_setup_isapnp(char *str)
1173 {
1174 (void)((get_option(&str,&isapnp_rdp) == 2) &&
1175 (get_option(&str,&isapnp_reset) == 2) &&
1176 (get_option(&str,&isapnp_verbose) == 2));
1177 return 1;
1178 }
1179
1180 __setup("isapnp=", isapnp_setup_isapnp);
1181
1182
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