PNP: convert resource options to single linked list
[linux-2.6.git] / drivers / pnp / isapnp / core.c
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/slab.h>
41 #include <linux/delay.h>
42 #include <linux/init.h>
43 #include <linux/isapnp.h>
44 #include <linux/mutex.h>
45 #include <asm/io.h>
46
47 #include "../base.h"
48
49 #if 0
50 #define ISAPNP_REGION_OK
51 #endif
52
53 int isapnp_disable;             /* Disable ISA PnP */
54 static int isapnp_rdp;          /* Read Data Port */
55 static int isapnp_reset = 1;    /* reset all PnP cards (deactivate) */
56 static int isapnp_verbose = 1;  /* verbose mode */
57
58 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
59 MODULE_DESCRIPTION("Generic ISA Plug & Play support");
60 module_param(isapnp_disable, int, 0);
61 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable");
62 module_param(isapnp_rdp, int, 0);
63 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
64 module_param(isapnp_reset, int, 0);
65 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
66 module_param(isapnp_verbose, int, 0);
67 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
68 MODULE_LICENSE("GPL");
69
70 #define _PIDXR          0x279
71 #define _PNPWRP         0xa79
72
73 /* short tags */
74 #define _STAG_PNPVERNO          0x01
75 #define _STAG_LOGDEVID          0x02
76 #define _STAG_COMPATDEVID       0x03
77 #define _STAG_IRQ               0x04
78 #define _STAG_DMA               0x05
79 #define _STAG_STARTDEP          0x06
80 #define _STAG_ENDDEP            0x07
81 #define _STAG_IOPORT            0x08
82 #define _STAG_FIXEDIO           0x09
83 #define _STAG_VENDOR            0x0e
84 #define _STAG_END               0x0f
85 /* long tags */
86 #define _LTAG_MEMRANGE          0x81
87 #define _LTAG_ANSISTR           0x82
88 #define _LTAG_UNICODESTR        0x83
89 #define _LTAG_VENDOR            0x84
90 #define _LTAG_MEM32RANGE        0x85
91 #define _LTAG_FIXEDMEM32RANGE   0x86
92
93 /* Logical device control and configuration registers */
94
95 #define ISAPNP_CFG_ACTIVATE     0x30    /* byte */
96 #define ISAPNP_CFG_MEM          0x40    /* 4 * dword */
97 #define ISAPNP_CFG_PORT         0x60    /* 8 * word */
98 #define ISAPNP_CFG_IRQ          0x70    /* 2 * word */
99 #define ISAPNP_CFG_DMA          0x74    /* 2 * byte */
100
101 /*
102  * Sizes of ISAPNP logical device configuration register sets.
103  * See PNP-ISA-v1.0a.pdf, Appendix A.
104  */
105 #define ISAPNP_MAX_MEM          4
106 #define ISAPNP_MAX_PORT         8
107 #define ISAPNP_MAX_IRQ          2
108 #define ISAPNP_MAX_DMA          2
109
110 static unsigned char isapnp_checksum_value;
111 static DEFINE_MUTEX(isapnp_cfg_mutex);
112 static int isapnp_csn_count;
113
114 /* some prototypes */
115
116 static inline void write_data(unsigned char x)
117 {
118         outb(x, _PNPWRP);
119 }
120
121 static inline void write_address(unsigned char x)
122 {
123         outb(x, _PIDXR);
124         udelay(20);
125 }
126
127 static inline unsigned char read_data(void)
128 {
129         unsigned char val = inb(isapnp_rdp);
130         return val;
131 }
132
133 unsigned char isapnp_read_byte(unsigned char idx)
134 {
135         write_address(idx);
136         return read_data();
137 }
138
139 static unsigned short isapnp_read_word(unsigned char idx)
140 {
141         unsigned short val;
142
143         val = isapnp_read_byte(idx);
144         val = (val << 8) + isapnp_read_byte(idx + 1);
145         return val;
146 }
147
148 void isapnp_write_byte(unsigned char idx, unsigned char val)
149 {
150         write_address(idx);
151         write_data(val);
152 }
153
154 static void isapnp_write_word(unsigned char idx, unsigned short val)
155 {
156         isapnp_write_byte(idx, val >> 8);
157         isapnp_write_byte(idx + 1, val);
158 }
159
160 static void isapnp_key(void)
161 {
162         unsigned char code = 0x6a, msb;
163         int i;
164
165         mdelay(1);
166         write_address(0x00);
167         write_address(0x00);
168
169         write_address(code);
170
171         for (i = 1; i < 32; i++) {
172                 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
173                 code = (code >> 1) | msb;
174                 write_address(code);
175         }
176 }
177
178 /* place all pnp cards in wait-for-key state */
179 static void isapnp_wait(void)
180 {
181         isapnp_write_byte(0x02, 0x02);
182 }
183
184 static void isapnp_wake(unsigned char csn)
185 {
186         isapnp_write_byte(0x03, csn);
187 }
188
189 static void isapnp_device(unsigned char logdev)
190 {
191         isapnp_write_byte(0x07, logdev);
192 }
193
194 static void isapnp_activate(unsigned char logdev)
195 {
196         isapnp_device(logdev);
197         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
198         udelay(250);
199 }
200
201 static void isapnp_deactivate(unsigned char logdev)
202 {
203         isapnp_device(logdev);
204         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
205         udelay(500);
206 }
207
208 static void __init isapnp_peek(unsigned char *data, int bytes)
209 {
210         int i, j;
211         unsigned char d = 0;
212
213         for (i = 1; i <= bytes; i++) {
214                 for (j = 0; j < 20; j++) {
215                         d = isapnp_read_byte(0x05);
216                         if (d & 1)
217                                 break;
218                         udelay(100);
219                 }
220                 if (!(d & 1)) {
221                         if (data != NULL)
222                                 *data++ = 0xff;
223                         continue;
224                 }
225                 d = isapnp_read_byte(0x04);     /* PRESDI */
226                 isapnp_checksum_value += d;
227                 if (data != NULL)
228                         *data++ = d;
229         }
230 }
231
232 #define RDP_STEP        32      /* minimum is 4 */
233
234 static int isapnp_next_rdp(void)
235 {
236         int rdp = isapnp_rdp;
237         static int old_rdp = 0;
238
239         if (old_rdp) {
240                 release_region(old_rdp, 1);
241                 old_rdp = 0;
242         }
243         while (rdp <= 0x3ff) {
244                 /*
245                  *      We cannot use NE2000 probe spaces for ISAPnP or we
246                  *      will lock up machines.
247                  */
248                 if ((rdp < 0x280 || rdp > 0x380)
249                     && request_region(rdp, 1, "ISAPnP")) {
250                         isapnp_rdp = rdp;
251                         old_rdp = rdp;
252                         return 0;
253                 }
254                 rdp += RDP_STEP;
255         }
256         return -1;
257 }
258
259 /* Set read port address */
260 static inline void isapnp_set_rdp(void)
261 {
262         isapnp_write_byte(0x00, isapnp_rdp >> 2);
263         udelay(100);
264 }
265
266 /*
267  *      Perform an isolation. The port selection code now tries to avoid
268  *      "dangerous to read" ports.
269  */
270 static int __init isapnp_isolate_rdp_select(void)
271 {
272         isapnp_wait();
273         isapnp_key();
274
275         /* Control: reset CSN and conditionally everything else too */
276         isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
277         mdelay(2);
278
279         isapnp_wait();
280         isapnp_key();
281         isapnp_wake(0x00);
282
283         if (isapnp_next_rdp() < 0) {
284                 isapnp_wait();
285                 return -1;
286         }
287
288         isapnp_set_rdp();
289         udelay(1000);
290         write_address(0x01);
291         udelay(1000);
292         return 0;
293 }
294
295 /*
296  *  Isolate (assign uniqued CSN) to all ISA PnP devices.
297  */
298 static int __init isapnp_isolate(void)
299 {
300         unsigned char checksum = 0x6a;
301         unsigned char chksum = 0x00;
302         unsigned char bit = 0x00;
303         int data;
304         int csn = 0;
305         int i;
306         int iteration = 1;
307
308         isapnp_rdp = 0x213;
309         if (isapnp_isolate_rdp_select() < 0)
310                 return -1;
311
312         while (1) {
313                 for (i = 1; i <= 64; i++) {
314                         data = read_data() << 8;
315                         udelay(250);
316                         data = data | read_data();
317                         udelay(250);
318                         if (data == 0x55aa)
319                                 bit = 0x01;
320                         checksum =
321                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
322                             | (checksum >> 1);
323                         bit = 0x00;
324                 }
325                 for (i = 65; i <= 72; i++) {
326                         data = read_data() << 8;
327                         udelay(250);
328                         data = data | read_data();
329                         udelay(250);
330                         if (data == 0x55aa)
331                                 chksum |= (1 << (i - 65));
332                 }
333                 if (checksum != 0x00 && checksum == chksum) {
334                         csn++;
335
336                         isapnp_write_byte(0x06, csn);
337                         udelay(250);
338                         iteration++;
339                         isapnp_wake(0x00);
340                         isapnp_set_rdp();
341                         udelay(1000);
342                         write_address(0x01);
343                         udelay(1000);
344                         goto __next;
345                 }
346                 if (iteration == 1) {
347                         isapnp_rdp += RDP_STEP;
348                         if (isapnp_isolate_rdp_select() < 0)
349                                 return -1;
350                 } else if (iteration > 1) {
351                         break;
352                 }
353 __next:
354                 if (csn == 255)
355                         break;
356                 checksum = 0x6a;
357                 chksum = 0x00;
358                 bit = 0x00;
359         }
360         isapnp_wait();
361         isapnp_csn_count = csn;
362         return csn;
363 }
364
365 /*
366  *  Read one tag from stream.
367  */
368 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
369 {
370         unsigned char tag, tmp[2];
371
372         isapnp_peek(&tag, 1);
373         if (tag == 0)           /* invalid tag */
374                 return -1;
375         if (tag & 0x80) {       /* large item */
376                 *type = tag;
377                 isapnp_peek(tmp, 2);
378                 *size = (tmp[1] << 8) | tmp[0];
379         } else {
380                 *type = (tag >> 3) & 0x0f;
381                 *size = tag & 0x07;
382         }
383 #if 0
384         printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type,
385                *size);
386 #endif
387         if (*type == 0xff && *size == 0xffff)   /* probably invalid data */
388                 return -1;
389         return 0;
390 }
391
392 /*
393  *  Skip specified number of bytes from stream.
394  */
395 static void __init isapnp_skip_bytes(int count)
396 {
397         isapnp_peek(NULL, count);
398 }
399
400 /*
401  *  Parse logical device tag.
402  */
403 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
404                                                   int size, int number)
405 {
406         unsigned char tmp[6];
407         struct pnp_dev *dev;
408         u32 eisa_id;
409         char id[8];
410
411         isapnp_peek(tmp, size);
412         eisa_id = tmp[0] | tmp[1] << 8 | tmp[2] << 16 | tmp[3] << 24;
413         pnp_eisa_id_to_string(eisa_id, id);
414
415         dev = pnp_alloc_dev(&isapnp_protocol, number, id);
416         if (!dev)
417                 return NULL;
418
419         dev->card = card;
420         dev->capabilities |= PNP_CONFIGURABLE;
421         dev->capabilities |= PNP_READ;
422         dev->capabilities |= PNP_WRITE;
423         dev->capabilities |= PNP_DISABLE;
424         pnp_init_resources(dev);
425         return dev;
426 }
427
428 /*
429  *  Add IRQ resource to resources list.
430  */
431 static void __init isapnp_parse_irq_resource(struct pnp_dev *dev,
432                                              unsigned int option_flags,
433                                              int size)
434 {
435         unsigned char tmp[3];
436         unsigned long bits;
437         pnp_irq_mask_t map;
438         unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
439
440         isapnp_peek(tmp, size);
441         bits = (tmp[1] << 8) | tmp[0];
442
443         bitmap_zero(map.bits, PNP_IRQ_NR);
444         bitmap_copy(map.bits, &bits, 16);
445
446         if (size > 2)
447                 flags = tmp[2];
448
449         pnp_register_irq_resource(dev, option_flags, &map, flags);
450 }
451
452 /*
453  *  Add DMA resource to resources list.
454  */
455 static void __init isapnp_parse_dma_resource(struct pnp_dev *dev,
456                                              unsigned int option_flags,
457                                              int size)
458 {
459         unsigned char tmp[2];
460
461         isapnp_peek(tmp, size);
462         pnp_register_dma_resource(dev, option_flags, tmp[0], tmp[1]);
463 }
464
465 /*
466  *  Add port resource to resources list.
467  */
468 static void __init isapnp_parse_port_resource(struct pnp_dev *dev,
469                                               unsigned int option_flags,
470                                               int size)
471 {
472         unsigned char tmp[7];
473         resource_size_t min, max, align, len;
474         unsigned char flags;
475
476         isapnp_peek(tmp, size);
477         min = (tmp[2] << 8) | tmp[1];
478         max = (tmp[4] << 8) | tmp[3];
479         align = tmp[5];
480         len = tmp[6];
481         flags = tmp[0] ? IORESOURCE_IO_16BIT_ADDR : 0;
482         pnp_register_port_resource(dev, option_flags,
483                                    min, max, align, len, flags);
484 }
485
486 /*
487  *  Add fixed port resource to resources list.
488  */
489 static void __init isapnp_parse_fixed_port_resource(struct pnp_dev *dev,
490                                                     unsigned int option_flags,
491                                                     int size)
492 {
493         unsigned char tmp[3];
494         resource_size_t base, len;
495
496         isapnp_peek(tmp, size);
497         base = (tmp[1] << 8) | tmp[0];
498         len = tmp[2];
499         pnp_register_port_resource(dev, option_flags, base, base, 0, len,
500                                    IORESOURCE_IO_FIXED);
501 }
502
503 /*
504  *  Add memory resource to resources list.
505  */
506 static void __init isapnp_parse_mem_resource(struct pnp_dev *dev,
507                                              unsigned int option_flags,
508                                              int size)
509 {
510         unsigned char tmp[9];
511         resource_size_t min, max, align, len;
512         unsigned char flags;
513
514         isapnp_peek(tmp, size);
515         min = ((tmp[2] << 8) | tmp[1]) << 8;
516         max = ((tmp[4] << 8) | tmp[3]) << 8;
517         align = (tmp[6] << 8) | tmp[5];
518         len = ((tmp[8] << 8) | tmp[7]) << 8;
519         flags = tmp[0];
520         pnp_register_mem_resource(dev, option_flags,
521                                   min, max, align, len, flags);
522 }
523
524 /*
525  *  Add 32-bit memory resource to resources list.
526  */
527 static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev,
528                                                unsigned int option_flags,
529                                                int size)
530 {
531         unsigned char tmp[17];
532         resource_size_t min, max, align, len;
533         unsigned char flags;
534
535         isapnp_peek(tmp, size);
536         min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
537         max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
538         align = (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
539         len = (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
540         flags = tmp[0];
541         pnp_register_mem_resource(dev, option_flags,
542                                   min, max, align, len, flags);
543 }
544
545 /*
546  *  Add 32-bit fixed memory resource to resources list.
547  */
548 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev,
549                                                      unsigned int option_flags,
550                                                      int size)
551 {
552         unsigned char tmp[9];
553         resource_size_t base, len;
554         unsigned char flags;
555
556         isapnp_peek(tmp, size);
557         base = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
558         len = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
559         flags = tmp[0];
560         pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
561 }
562
563 /*
564  *  Parse card name for ISA PnP device.
565  */
566 static void __init
567 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
568 {
569         if (name[0] == '\0') {
570                 unsigned short size1 =
571                     *size >= name_max ? (name_max - 1) : *size;
572                 isapnp_peek(name, size1);
573                 name[size1] = '\0';
574                 *size -= size1;
575
576                 /* clean whitespace from end of string */
577                 while (size1 > 0 && name[--size1] == ' ')
578                         name[size1] = '\0';
579         }
580 }
581
582 /*
583  *  Parse resource map for logical device.
584  */
585 static int __init isapnp_create_device(struct pnp_card *card,
586                                        unsigned short size)
587 {
588         int number = 0, skip = 0, priority, compat = 0;
589         unsigned char type, tmp[17];
590         unsigned int option_flags;
591         struct pnp_dev *dev;
592         u32 eisa_id;
593         char id[8];
594
595         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
596                 return 1;
597         option_flags = 0;
598         pnp_add_card_device(card, dev);
599
600         while (1) {
601                 if (isapnp_read_tag(&type, &size) < 0)
602                         return 1;
603                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
604                         goto __skip;
605                 switch (type) {
606                 case _STAG_LOGDEVID:
607                         if (size >= 5 && size <= 6) {
608                                 if ((dev =
609                                      isapnp_parse_device(card, size,
610                                                          number++)) == NULL)
611                                         return 1;
612                                 size = 0;
613                                 skip = 0;
614                                 option_flags = 0;
615                                 pnp_add_card_device(card, dev);
616                         } else {
617                                 skip = 1;
618                         }
619                         compat = 0;
620                         break;
621                 case _STAG_COMPATDEVID:
622                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
623                                 isapnp_peek(tmp, 4);
624                                 eisa_id = tmp[0] | tmp[1] << 8 |
625                                           tmp[2] << 16 | tmp[3] << 24;
626                                 pnp_eisa_id_to_string(eisa_id, id);
627                                 pnp_add_id(dev, id);
628                                 compat++;
629                                 size = 0;
630                         }
631                         break;
632                 case _STAG_IRQ:
633                         if (size < 2 || size > 3)
634                                 goto __skip;
635                         isapnp_parse_irq_resource(dev, option_flags, size);
636                         size = 0;
637                         break;
638                 case _STAG_DMA:
639                         if (size != 2)
640                                 goto __skip;
641                         isapnp_parse_dma_resource(dev, option_flags, size);
642                         size = 0;
643                         break;
644                 case _STAG_STARTDEP:
645                         if (size > 1)
646                                 goto __skip;
647                         priority = PNP_RES_PRIORITY_ACCEPTABLE;
648                         if (size > 0) {
649                                 isapnp_peek(tmp, size);
650                                 priority = tmp[0];
651                                 size = 0;
652                         }
653                         option_flags = pnp_new_dependent_set(dev, priority);
654                         break;
655                 case _STAG_ENDDEP:
656                         if (size != 0)
657                                 goto __skip;
658                         option_flags = 0;
659                         break;
660                 case _STAG_IOPORT:
661                         if (size != 7)
662                                 goto __skip;
663                         isapnp_parse_port_resource(dev, option_flags, size);
664                         size = 0;
665                         break;
666                 case _STAG_FIXEDIO:
667                         if (size != 3)
668                                 goto __skip;
669                         isapnp_parse_fixed_port_resource(dev, option_flags,
670                                                          size);
671                         size = 0;
672                         break;
673                 case _STAG_VENDOR:
674                         break;
675                 case _LTAG_MEMRANGE:
676                         if (size != 9)
677                                 goto __skip;
678                         isapnp_parse_mem_resource(dev, option_flags, size);
679                         size = 0;
680                         break;
681                 case _LTAG_ANSISTR:
682                         isapnp_parse_name(dev->name, sizeof(dev->name), &size);
683                         break;
684                 case _LTAG_UNICODESTR:
685                         /* silently ignore */
686                         /* who use unicode for hardware identification? */
687                         break;
688                 case _LTAG_VENDOR:
689                         break;
690                 case _LTAG_MEM32RANGE:
691                         if (size != 17)
692                                 goto __skip;
693                         isapnp_parse_mem32_resource(dev, option_flags, size);
694                         size = 0;
695                         break;
696                 case _LTAG_FIXEDMEM32RANGE:
697                         if (size != 9)
698                                 goto __skip;
699                         isapnp_parse_fixed_mem32_resource(dev, option_flags,
700                                                           size);
701                         size = 0;
702                         break;
703                 case _STAG_END:
704                         if (size > 0)
705                                 isapnp_skip_bytes(size);
706                         return 1;
707                 default:
708                         dev_err(&dev->dev, "unknown tag %#x (card %i), "
709                                 "ignored\n", type, card->number);
710                 }
711 __skip:
712                 if (size > 0)
713                         isapnp_skip_bytes(size);
714         }
715         return 0;
716 }
717
718 /*
719  *  Parse resource map for ISA PnP card.
720  */
721 static void __init isapnp_parse_resource_map(struct pnp_card *card)
722 {
723         unsigned char type, tmp[17];
724         unsigned short size;
725
726         while (1) {
727                 if (isapnp_read_tag(&type, &size) < 0)
728                         return;
729                 switch (type) {
730                 case _STAG_PNPVERNO:
731                         if (size != 2)
732                                 goto __skip;
733                         isapnp_peek(tmp, 2);
734                         card->pnpver = tmp[0];
735                         card->productver = tmp[1];
736                         size = 0;
737                         break;
738                 case _STAG_LOGDEVID:
739                         if (size >= 5 && size <= 6) {
740                                 if (isapnp_create_device(card, size) == 1)
741                                         return;
742                                 size = 0;
743                         }
744                         break;
745                 case _STAG_VENDOR:
746                         break;
747                 case _LTAG_ANSISTR:
748                         isapnp_parse_name(card->name, sizeof(card->name),
749                                           &size);
750                         break;
751                 case _LTAG_UNICODESTR:
752                         /* silently ignore */
753                         /* who use unicode for hardware identification? */
754                         break;
755                 case _LTAG_VENDOR:
756                         break;
757                 case _STAG_END:
758                         if (size > 0)
759                                 isapnp_skip_bytes(size);
760                         return;
761                 default:
762                         dev_err(&card->dev, "unknown tag %#x, ignored\n",
763                                type);
764                 }
765 __skip:
766                 if (size > 0)
767                         isapnp_skip_bytes(size);
768         }
769 }
770
771 /*
772  *  Compute ISA PnP checksum for first eight bytes.
773  */
774 static unsigned char __init isapnp_checksum(unsigned char *data)
775 {
776         int i, j;
777         unsigned char checksum = 0x6a, bit, b;
778
779         for (i = 0; i < 8; i++) {
780                 b = data[i];
781                 for (j = 0; j < 8; j++) {
782                         bit = 0;
783                         if (b & (1 << j))
784                                 bit = 1;
785                         checksum =
786                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
787                             | (checksum >> 1);
788                 }
789         }
790         return checksum;
791 }
792
793 /*
794  *  Build device list for all present ISA PnP devices.
795  */
796 static int __init isapnp_build_device_list(void)
797 {
798         int csn;
799         unsigned char header[9], checksum;
800         struct pnp_card *card;
801         u32 eisa_id;
802         char id[8];
803
804         isapnp_wait();
805         isapnp_key();
806         for (csn = 1; csn <= isapnp_csn_count; csn++) {
807                 isapnp_wake(csn);
808                 isapnp_peek(header, 9);
809                 checksum = isapnp_checksum(header);
810                 eisa_id = header[0] | header[1] << 8 |
811                           header[2] << 16 | header[3] << 24;
812                 pnp_eisa_id_to_string(eisa_id, id);
813                 card = pnp_alloc_card(&isapnp_protocol, csn, id);
814                 if (!card)
815                         continue;
816
817 #if 0
818                 dev_info(&card->dev,
819                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
820                        header[0], header[1], header[2], header[3], header[4],
821                        header[5], header[6], header[7], header[8]);
822                 dev_info(&card->dev, "checksum = %#x\n", checksum);
823 #endif
824                 INIT_LIST_HEAD(&card->devices);
825                 card->serial =
826                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
827                     header[4];
828                 isapnp_checksum_value = 0x00;
829                 isapnp_parse_resource_map(card);
830                 if (isapnp_checksum_value != 0x00)
831                         dev_err(&card->dev, "invalid checksum %#x\n",
832                                 isapnp_checksum_value);
833                 card->checksum = isapnp_checksum_value;
834
835                 pnp_add_card(card);
836         }
837         isapnp_wait();
838         return 0;
839 }
840
841 /*
842  *  Basic configuration routines.
843  */
844
845 int isapnp_present(void)
846 {
847         struct pnp_card *card;
848
849         pnp_for_each_card(card) {
850                 if (card->protocol == &isapnp_protocol)
851                         return 1;
852         }
853         return 0;
854 }
855
856 int isapnp_cfg_begin(int csn, int logdev)
857 {
858         if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
859                 return -EINVAL;
860         mutex_lock(&isapnp_cfg_mutex);
861         isapnp_wait();
862         isapnp_key();
863         isapnp_wake(csn);
864 #if 0
865         /* to avoid malfunction when the isapnptools package is used */
866         /* we must set RDP to our value again */
867         /* it is possible to set RDP only in the isolation phase */
868         /*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
869         isapnp_write_byte(0x02, 0x04);  /* clear CSN of card */
870         mdelay(2);              /* is this necessary? */
871         isapnp_wake(csn);       /* bring card into sleep state */
872         isapnp_wake(0);         /* bring card into isolation state */
873         isapnp_set_rdp();       /* reset the RDP port */
874         udelay(1000);           /* delay 1000us */
875         isapnp_write_byte(0x06, csn);   /* reset CSN to previous value */
876         udelay(250);            /* is this necessary? */
877 #endif
878         if (logdev >= 0)
879                 isapnp_device(logdev);
880         return 0;
881 }
882
883 int isapnp_cfg_end(void)
884 {
885         isapnp_wait();
886         mutex_unlock(&isapnp_cfg_mutex);
887         return 0;
888 }
889
890 /*
891  *  Initialization.
892  */
893
894 EXPORT_SYMBOL(isapnp_protocol);
895 EXPORT_SYMBOL(isapnp_present);
896 EXPORT_SYMBOL(isapnp_cfg_begin);
897 EXPORT_SYMBOL(isapnp_cfg_end);
898 EXPORT_SYMBOL(isapnp_write_byte);
899
900 static int isapnp_get_resources(struct pnp_dev *dev)
901 {
902         int i, ret;
903
904         dev_dbg(&dev->dev, "get resources\n");
905         pnp_init_resources(dev);
906         isapnp_cfg_begin(dev->card->number, dev->number);
907         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
908         if (!dev->active)
909                 goto __end;
910
911         for (i = 0; i < ISAPNP_MAX_PORT; i++) {
912                 ret = isapnp_read_word(ISAPNP_CFG_PORT + (i << 1));
913                 pnp_add_io_resource(dev, ret, ret,
914                                     ret == 0 ? IORESOURCE_DISABLED : 0);
915         }
916         for (i = 0; i < ISAPNP_MAX_MEM; i++) {
917                 ret = isapnp_read_word(ISAPNP_CFG_MEM + (i << 3)) << 8;
918                 pnp_add_mem_resource(dev, ret, ret,
919                                      ret == 0 ? IORESOURCE_DISABLED : 0);
920         }
921         for (i = 0; i < ISAPNP_MAX_IRQ; i++) {
922                 ret = isapnp_read_word(ISAPNP_CFG_IRQ + (i << 1)) >> 8;
923                 pnp_add_irq_resource(dev, ret,
924                                      ret == 0 ? IORESOURCE_DISABLED : 0);
925         }
926         for (i = 0; i < ISAPNP_MAX_DMA; i++) {
927                 ret = isapnp_read_byte(ISAPNP_CFG_DMA + i);
928                 pnp_add_dma_resource(dev, ret,
929                                      ret == 4 ? IORESOURCE_DISABLED : 0);
930         }
931
932 __end:
933         isapnp_cfg_end();
934         return 0;
935 }
936
937 static int isapnp_set_resources(struct pnp_dev *dev)
938 {
939         struct resource *res;
940         int tmp;
941
942         dev_dbg(&dev->dev, "set resources\n");
943         isapnp_cfg_begin(dev->card->number, dev->number);
944         dev->active = 1;
945         for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
946                 res = pnp_get_resource(dev, IORESOURCE_IO, tmp);
947                 if (pnp_resource_enabled(res)) {
948                         dev_dbg(&dev->dev, "  set io  %d to %#llx\n",
949                                 tmp, (unsigned long long) res->start);
950                         isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
951                                           res->start);
952                 }
953         }
954         for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
955                 res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp);
956                 if (pnp_resource_enabled(res)) {
957                         int irq = res->start;
958                         if (irq == 2)
959                                 irq = 9;
960                         dev_dbg(&dev->dev, "  set irq %d to %d\n", tmp, irq);
961                         isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
962                 }
963         }
964         for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
965                 res = pnp_get_resource(dev, IORESOURCE_DMA, tmp);
966                 if (pnp_resource_enabled(res)) {
967                         dev_dbg(&dev->dev, "  set dma %d to %lld\n",
968                                 tmp, (unsigned long long) res->start);
969                         isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start);
970                 }
971         }
972         for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
973                 res = pnp_get_resource(dev, IORESOURCE_MEM, tmp);
974                 if (pnp_resource_enabled(res)) {
975                         dev_dbg(&dev->dev, "  set mem %d to %#llx\n",
976                                 tmp, (unsigned long long) res->start);
977                         isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
978                                           (res->start >> 8) & 0xffff);
979                 }
980         }
981         /* FIXME: We aren't handling 32bit mems properly here */
982         isapnp_activate(dev->number);
983         isapnp_cfg_end();
984         return 0;
985 }
986
987 static int isapnp_disable_resources(struct pnp_dev *dev)
988 {
989         if (!dev->active)
990                 return -EINVAL;
991         isapnp_cfg_begin(dev->card->number, dev->number);
992         isapnp_deactivate(dev->number);
993         dev->active = 0;
994         isapnp_cfg_end();
995         return 0;
996 }
997
998 struct pnp_protocol isapnp_protocol = {
999         .name = "ISA Plug and Play",
1000         .get = isapnp_get_resources,
1001         .set = isapnp_set_resources,
1002         .disable = isapnp_disable_resources,
1003 };
1004
1005 static int __init isapnp_init(void)
1006 {
1007         int cards;
1008         struct pnp_card *card;
1009         struct pnp_dev *dev;
1010
1011         if (isapnp_disable) {
1012                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1013                 return 0;
1014         }
1015 #ifdef CONFIG_PPC_MERGE
1016         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1017                 return -EINVAL;
1018 #endif
1019 #ifdef ISAPNP_REGION_OK
1020         if (!request_region(_PIDXR, 1, "isapnp index")) {
1021                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1022                        _PIDXR);
1023                 return -EBUSY;
1024         }
1025 #endif
1026         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1027                 printk(KERN_ERR
1028                        "isapnp: Write Data Register 0x%x already used\n",
1029                        _PNPWRP);
1030 #ifdef ISAPNP_REGION_OK
1031                 release_region(_PIDXR, 1);
1032 #endif
1033                 return -EBUSY;
1034         }
1035
1036         if (pnp_register_protocol(&isapnp_protocol) < 0)
1037                 return -EBUSY;
1038
1039         /*
1040          *      Print a message. The existing ISAPnP code is hanging machines
1041          *      so let the user know where.
1042          */
1043
1044         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1045         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1046                 isapnp_rdp |= 3;
1047                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1048                         printk(KERN_ERR
1049                                "isapnp: Read Data Register 0x%x already used\n",
1050                                isapnp_rdp);
1051 #ifdef ISAPNP_REGION_OK
1052                         release_region(_PIDXR, 1);
1053 #endif
1054                         release_region(_PNPWRP, 1);
1055                         return -EBUSY;
1056                 }
1057                 isapnp_set_rdp();
1058         }
1059         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1060                 cards = isapnp_isolate();
1061                 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1062 #ifdef ISAPNP_REGION_OK
1063                         release_region(_PIDXR, 1);
1064 #endif
1065                         release_region(_PNPWRP, 1);
1066                         printk(KERN_INFO
1067                                "isapnp: No Plug & Play device found\n");
1068                         return 0;
1069                 }
1070                 request_region(isapnp_rdp, 1, "isapnp read");
1071         }
1072         isapnp_build_device_list();
1073         cards = 0;
1074
1075         protocol_for_each_card(&isapnp_protocol, card) {
1076                 cards++;
1077                 if (isapnp_verbose) {
1078                         dev_info(&card->dev, "card '%s'\n",
1079                                card->name[0] ? card->name : "unknown");
1080                         if (isapnp_verbose < 2)
1081                                 continue;
1082                         card_for_each_dev(card, dev) {
1083                                 dev_info(&card->dev, "device '%s'\n",
1084                                        dev->name[0] ? dev->name : "unknown");
1085                         }
1086                 }
1087         }
1088         if (cards)
1089                 printk(KERN_INFO
1090                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1091                        cards > 1 ? "s" : "");
1092         else
1093                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1094
1095         isapnp_proc_init();
1096         return 0;
1097 }
1098
1099 device_initcall(isapnp_init);
1100
1101 /* format is: noisapnp */
1102
1103 static int __init isapnp_setup_disable(char *str)
1104 {
1105         isapnp_disable = 1;
1106         return 1;
1107 }
1108
1109 __setup("noisapnp", isapnp_setup_disable);
1110
1111 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1112
1113 static int __init isapnp_setup_isapnp(char *str)
1114 {
1115         (void)((get_option(&str, &isapnp_rdp) == 2) &&
1116                (get_option(&str, &isapnp_reset) == 2) &&
1117                (get_option(&str, &isapnp_verbose) == 2));
1118         return 1;
1119 }
1120
1121 __setup("isapnp=", isapnp_setup_isapnp);