b4e2aa995b53160ef5056ea2180b95ff2e05b300
[linux-2.6.git] / drivers / pnp / isapnp / core.c
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/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 #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 static int isapnp_rdp;          /* Read Data Port */
56 static int isapnp_reset = 1;    /* reset all PnP cards (deactivate) */
57 static 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 DEFINE_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 static 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 void isapnp_write_byte(unsigned char idx, unsigned char val)
134 {
135         write_address(idx);
136         write_data(val);
137 }
138
139 static void isapnp_write_word(unsigned char idx, unsigned short val)
140 {
141         isapnp_write_byte(idx, val >> 8);
142         isapnp_write_byte(idx + 1, val);
143 }
144
145 static void isapnp_key(void)
146 {
147         unsigned char code = 0x6a, msb;
148         int i;
149
150         mdelay(1);
151         write_address(0x00);
152         write_address(0x00);
153
154         write_address(code);
155
156         for (i = 1; i < 32; i++) {
157                 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
158                 code = (code >> 1) | msb;
159                 write_address(code);
160         }
161 }
162
163 /* place all pnp cards in wait-for-key state */
164 static void isapnp_wait(void)
165 {
166         isapnp_write_byte(0x02, 0x02);
167 }
168
169 static void isapnp_wake(unsigned char csn)
170 {
171         isapnp_write_byte(0x03, csn);
172 }
173
174 static void isapnp_device(unsigned char logdev)
175 {
176         isapnp_write_byte(0x07, logdev);
177 }
178
179 static void isapnp_activate(unsigned char logdev)
180 {
181         isapnp_device(logdev);
182         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
183         udelay(250);
184 }
185
186 static void isapnp_deactivate(unsigned char logdev)
187 {
188         isapnp_device(logdev);
189         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
190         udelay(500);
191 }
192
193 static void __init isapnp_peek(unsigned char *data, int bytes)
194 {
195         int i, j;
196         unsigned char d = 0;
197
198         for (i = 1; i <= bytes; i++) {
199                 for (j = 0; j < 20; j++) {
200                         d = isapnp_read_byte(0x05);
201                         if (d & 1)
202                                 break;
203                         udelay(100);
204                 }
205                 if (!(d & 1)) {
206                         if (data != NULL)
207                                 *data++ = 0xff;
208                         continue;
209                 }
210                 d = isapnp_read_byte(0x04);     /* PRESDI */
211                 isapnp_checksum_value += d;
212                 if (data != NULL)
213                         *data++ = d;
214         }
215 }
216
217 #define RDP_STEP        32      /* minimum is 4 */
218
219 static int isapnp_next_rdp(void)
220 {
221         int rdp = isapnp_rdp;
222         static int old_rdp = 0;
223
224         if (old_rdp) {
225                 release_region(old_rdp, 1);
226                 old_rdp = 0;
227         }
228         while (rdp <= 0x3ff) {
229                 /*
230                  *      We cannot use NE2000 probe spaces for ISAPnP or we
231                  *      will lock up machines.
232                  */
233                 if ((rdp < 0x280 || rdp > 0x380)
234                     && request_region(rdp, 1, "ISAPnP")) {
235                         isapnp_rdp = rdp;
236                         old_rdp = rdp;
237                         return 0;
238                 }
239                 rdp += RDP_STEP;
240         }
241         return -1;
242 }
243
244 /* Set read port address */
245 static inline void isapnp_set_rdp(void)
246 {
247         isapnp_write_byte(0x00, isapnp_rdp >> 2);
248         udelay(100);
249 }
250
251 /*
252  *      Perform an isolation. The port selection code now tries to avoid
253  *      "dangerous to read" ports.
254  */
255 static int __init isapnp_isolate_rdp_select(void)
256 {
257         isapnp_wait();
258         isapnp_key();
259
260         /* Control: reset CSN and conditionally everything else too */
261         isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
262         mdelay(2);
263
264         isapnp_wait();
265         isapnp_key();
266         isapnp_wake(0x00);
267
268         if (isapnp_next_rdp() < 0) {
269                 isapnp_wait();
270                 return -1;
271         }
272
273         isapnp_set_rdp();
274         udelay(1000);
275         write_address(0x01);
276         udelay(1000);
277         return 0;
278 }
279
280 /*
281  *  Isolate (assign uniqued CSN) to all ISA PnP devices.
282  */
283 static int __init isapnp_isolate(void)
284 {
285         unsigned char checksum = 0x6a;
286         unsigned char chksum = 0x00;
287         unsigned char bit = 0x00;
288         int data;
289         int csn = 0;
290         int i;
291         int iteration = 1;
292
293         isapnp_rdp = 0x213;
294         if (isapnp_isolate_rdp_select() < 0)
295                 return -1;
296
297         while (1) {
298                 for (i = 1; i <= 64; i++) {
299                         data = read_data() << 8;
300                         udelay(250);
301                         data = data | read_data();
302                         udelay(250);
303                         if (data == 0x55aa)
304                                 bit = 0x01;
305                         checksum =
306                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
307                             | (checksum >> 1);
308                         bit = 0x00;
309                 }
310                 for (i = 65; i <= 72; i++) {
311                         data = read_data() << 8;
312                         udelay(250);
313                         data = data | read_data();
314                         udelay(250);
315                         if (data == 0x55aa)
316                                 chksum |= (1 << (i - 65));
317                 }
318                 if (checksum != 0x00 && checksum == chksum) {
319                         csn++;
320
321                         isapnp_write_byte(0x06, csn);
322                         udelay(250);
323                         iteration++;
324                         isapnp_wake(0x00);
325                         isapnp_set_rdp();
326                         udelay(1000);
327                         write_address(0x01);
328                         udelay(1000);
329                         goto __next;
330                 }
331                 if (iteration == 1) {
332                         isapnp_rdp += RDP_STEP;
333                         if (isapnp_isolate_rdp_select() < 0)
334                                 return -1;
335                 } else if (iteration > 1) {
336                         break;
337                 }
338               __next:
339                 if (csn == 255)
340                         break;
341                 checksum = 0x6a;
342                 chksum = 0x00;
343                 bit = 0x00;
344         }
345         isapnp_wait();
346         isapnp_csn_count = csn;
347         return csn;
348 }
349
350 /*
351  *  Read one tag from stream.
352  */
353 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
354 {
355         unsigned char tag, tmp[2];
356
357         isapnp_peek(&tag, 1);
358         if (tag == 0)           /* invalid tag */
359                 return -1;
360         if (tag & 0x80) {       /* large item */
361                 *type = tag;
362                 isapnp_peek(tmp, 2);
363                 *size = (tmp[1] << 8) | tmp[0];
364         } else {
365                 *type = (tag >> 3) & 0x0f;
366                 *size = tag & 0x07;
367         }
368 #if 0
369         printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type,
370                *size);
371 #endif
372         if (*type == 0xff && *size == 0xffff)   /* probably invalid data */
373                 return -1;
374         return 0;
375 }
376
377 /*
378  *  Skip specified number of bytes from stream.
379  */
380 static void __init isapnp_skip_bytes(int count)
381 {
382         isapnp_peek(NULL, count);
383 }
384
385 /*
386  *  Parse EISA id.
387  */
388 static void isapnp_parse_id(struct pnp_dev *dev, unsigned short vendor,
389                             unsigned short device)
390 {
391         struct pnp_id *id;
392
393         if (!dev)
394                 return;
395         id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
396         if (!id)
397                 return;
398         sprintf(id->id, "%c%c%c%x%x%x%x",
399                 'A' + ((vendor >> 2) & 0x3f) - 1,
400                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
401                 'A' + ((vendor >> 8) & 0x1f) - 1,
402                 (device >> 4) & 0x0f,
403                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
404         pnp_add_id(id, dev);
405 }
406
407 /*
408  *  Parse logical device tag.
409  */
410 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
411                                                   int size, int number)
412 {
413         unsigned char tmp[6];
414         struct pnp_dev *dev;
415
416         isapnp_peek(tmp, size);
417         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
418         if (!dev)
419                 return NULL;
420         dev->number = number;
421         isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0], (tmp[3] << 8) | tmp[2]);
422         dev->regs = tmp[4];
423         dev->card = card;
424         if (size > 5)
425                 dev->regs |= tmp[5] << 8;
426         dev->protocol = &isapnp_protocol;
427         dev->capabilities |= PNP_CONFIGURABLE;
428         dev->capabilities |= PNP_READ;
429         dev->capabilities |= PNP_WRITE;
430         dev->capabilities |= PNP_DISABLE;
431         pnp_init_resource_table(&dev->res);
432         return dev;
433 }
434
435 /*
436  *  Add IRQ resource to resources list.
437  */
438 static void __init isapnp_parse_irq_resource(struct pnp_option *option,
439                                              int size)
440 {
441         unsigned char tmp[3];
442         struct pnp_irq *irq;
443         unsigned long bits;
444
445         isapnp_peek(tmp, size);
446         irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
447         if (!irq)
448                 return;
449         bits = (tmp[1] << 8) | tmp[0];
450         bitmap_copy(irq->map, &bits, 16);
451         if (size > 2)
452                 irq->flags = tmp[2];
453         else
454                 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
455         pnp_register_irq_resource(option, irq);
456 }
457
458 /*
459  *  Add DMA resource to resources list.
460  */
461 static void __init isapnp_parse_dma_resource(struct pnp_option *option,
462                                              int size)
463 {
464         unsigned char tmp[2];
465         struct pnp_dma *dma;
466
467         isapnp_peek(tmp, size);
468         dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
469         if (!dma)
470                 return;
471         dma->map = tmp[0];
472         dma->flags = tmp[1];
473         pnp_register_dma_resource(option, dma);
474 }
475
476 /*
477  *  Add port resource to resources list.
478  */
479 static void __init isapnp_parse_port_resource(struct pnp_option *option,
480                                               int size)
481 {
482         unsigned char tmp[7];
483         struct pnp_port *port;
484
485         isapnp_peek(tmp, size);
486         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
487         if (!port)
488                 return;
489         port->min = (tmp[2] << 8) | tmp[1];
490         port->max = (tmp[4] << 8) | tmp[3];
491         port->align = tmp[5];
492         port->size = tmp[6];
493         port->flags = tmp[0] ? PNP_PORT_FLAG_16BITADDR : 0;
494         pnp_register_port_resource(option, port);
495 }
496
497 /*
498  *  Add fixed port resource to resources list.
499  */
500 static void __init isapnp_parse_fixed_port_resource(struct pnp_option *option,
501                                                     int size)
502 {
503         unsigned char tmp[3];
504         struct pnp_port *port;
505
506         isapnp_peek(tmp, size);
507         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
508         if (!port)
509                 return;
510         port->min = port->max = (tmp[1] << 8) | tmp[0];
511         port->size = tmp[2];
512         port->align = 0;
513         port->flags = PNP_PORT_FLAG_FIXED;
514         pnp_register_port_resource(option, port);
515 }
516
517 /*
518  *  Add memory resource to resources list.
519  */
520 static void __init isapnp_parse_mem_resource(struct pnp_option *option,
521                                              int size)
522 {
523         unsigned char tmp[9];
524         struct pnp_mem *mem;
525
526         isapnp_peek(tmp, size);
527         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
528         if (!mem)
529                 return;
530         mem->min = ((tmp[2] << 8) | tmp[1]) << 8;
531         mem->max = ((tmp[4] << 8) | tmp[3]) << 8;
532         mem->align = (tmp[6] << 8) | tmp[5];
533         mem->size = ((tmp[8] << 8) | tmp[7]) << 8;
534         mem->flags = tmp[0];
535         pnp_register_mem_resource(option, mem);
536 }
537
538 /*
539  *  Add 32-bit memory resource to resources list.
540  */
541 static void __init isapnp_parse_mem32_resource(struct pnp_option *option,
542                                                int size)
543 {
544         unsigned char tmp[17];
545         struct pnp_mem *mem;
546
547         isapnp_peek(tmp, size);
548         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
549         if (!mem)
550                 return;
551         mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
552         mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
553         mem->align =
554             (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
555         mem->size =
556             (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
557         mem->flags = tmp[0];
558         pnp_register_mem_resource(option, mem);
559 }
560
561 /*
562  *  Add 32-bit fixed memory resource to resources list.
563  */
564 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_option *option,
565                                                      int size)
566 {
567         unsigned char tmp[9];
568         struct pnp_mem *mem;
569
570         isapnp_peek(tmp, size);
571         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
572         if (!mem)
573                 return;
574         mem->min = mem->max =
575             (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
576         mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
577         mem->align = 0;
578         mem->flags = tmp[0];
579         pnp_register_mem_resource(option, mem);
580 }
581
582 /*
583  *  Parse card name for ISA PnP device.
584  */
585 static void __init
586 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
587 {
588         if (name[0] == '\0') {
589                 unsigned short size1 =
590                     *size >= name_max ? (name_max - 1) : *size;
591                 isapnp_peek(name, size1);
592                 name[size1] = '\0';
593                 *size -= size1;
594
595                 /* clean whitespace from end of string */
596                 while (size1 > 0 && name[--size1] == ' ')
597                         name[size1] = '\0';
598         }
599 }
600
601 /*
602  *  Parse resource map for logical device.
603  */
604 static int __init isapnp_create_device(struct pnp_card *card,
605                                        unsigned short size)
606 {
607         int number = 0, skip = 0, priority = 0, compat = 0;
608         unsigned char type, tmp[17];
609         struct pnp_option *option;
610         struct pnp_dev *dev;
611
612         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
613                 return 1;
614         option = pnp_register_independent_option(dev);
615         if (!option) {
616                 kfree(dev);
617                 return 1;
618         }
619         pnp_add_card_device(card, dev);
620
621         while (1) {
622                 if (isapnp_read_tag(&type, &size) < 0)
623                         return 1;
624                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
625                         goto __skip;
626                 switch (type) {
627                 case _STAG_LOGDEVID:
628                         if (size >= 5 && size <= 6) {
629                                 if ((dev =
630                                      isapnp_parse_device(card, size,
631                                                          number++)) == NULL)
632                                         return 1;
633                                 size = 0;
634                                 skip = 0;
635                                 option = pnp_register_independent_option(dev);
636                                 if (!option) {
637                                         kfree(dev);
638                                         return 1;
639                                 }
640                                 pnp_add_card_device(card, dev);
641                         } else {
642                                 skip = 1;
643                         }
644                         priority = 0;
645                         compat = 0;
646                         break;
647                 case _STAG_COMPATDEVID:
648                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
649                                 isapnp_peek(tmp, 4);
650                                 isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0],
651                                                 (tmp[3] << 8) | tmp[2]);
652                                 compat++;
653                                 size = 0;
654                         }
655                         break;
656                 case _STAG_IRQ:
657                         if (size < 2 || size > 3)
658                                 goto __skip;
659                         isapnp_parse_irq_resource(option, size);
660                         size = 0;
661                         break;
662                 case _STAG_DMA:
663                         if (size != 2)
664                                 goto __skip;
665                         isapnp_parse_dma_resource(option, size);
666                         size = 0;
667                         break;
668                 case _STAG_STARTDEP:
669                         if (size > 1)
670                                 goto __skip;
671                         priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
672                         if (size > 0) {
673                                 isapnp_peek(tmp, size);
674                                 priority = 0x100 | tmp[0];
675                                 size = 0;
676                         }
677                         option = pnp_register_dependent_option(dev, priority);
678                         if (!option)
679                                 return 1;
680                         break;
681                 case _STAG_ENDDEP:
682                         if (size != 0)
683                                 goto __skip;
684                         priority = 0;
685                         break;
686                 case _STAG_IOPORT:
687                         if (size != 7)
688                                 goto __skip;
689                         isapnp_parse_port_resource(option, size);
690                         size = 0;
691                         break;
692                 case _STAG_FIXEDIO:
693                         if (size != 3)
694                                 goto __skip;
695                         isapnp_parse_fixed_port_resource(option, size);
696                         size = 0;
697                         break;
698                 case _STAG_VENDOR:
699                         break;
700                 case _LTAG_MEMRANGE:
701                         if (size != 9)
702                                 goto __skip;
703                         isapnp_parse_mem_resource(option, size);
704                         size = 0;
705                         break;
706                 case _LTAG_ANSISTR:
707                         isapnp_parse_name(dev->name, sizeof(dev->name), &size);
708                         break;
709                 case _LTAG_UNICODESTR:
710                         /* silently ignore */
711                         /* who use unicode for hardware identification? */
712                         break;
713                 case _LTAG_VENDOR:
714                         break;
715                 case _LTAG_MEM32RANGE:
716                         if (size != 17)
717                                 goto __skip;
718                         isapnp_parse_mem32_resource(option, size);
719                         size = 0;
720                         break;
721                 case _LTAG_FIXEDMEM32RANGE:
722                         if (size != 9)
723                                 goto __skip;
724                         isapnp_parse_fixed_mem32_resource(option, size);
725                         size = 0;
726                         break;
727                 case _STAG_END:
728                         if (size > 0)
729                                 isapnp_skip_bytes(size);
730                         return 1;
731                 default:
732                         printk(KERN_ERR
733                                "isapnp: unexpected or unknown tag type 0x%x for logical device %i (device %i), ignored\n",
734                                type, dev->number, card->number);
735                 }
736               __skip:
737                 if (size > 0)
738                         isapnp_skip_bytes(size);
739         }
740         return 0;
741 }
742
743 /*
744  *  Parse resource map for ISA PnP card.
745  */
746 static void __init isapnp_parse_resource_map(struct pnp_card *card)
747 {
748         unsigned char type, tmp[17];
749         unsigned short size;
750
751         while (1) {
752                 if (isapnp_read_tag(&type, &size) < 0)
753                         return;
754                 switch (type) {
755                 case _STAG_PNPVERNO:
756                         if (size != 2)
757                                 goto __skip;
758                         isapnp_peek(tmp, 2);
759                         card->pnpver = tmp[0];
760                         card->productver = tmp[1];
761                         size = 0;
762                         break;
763                 case _STAG_LOGDEVID:
764                         if (size >= 5 && size <= 6) {
765                                 if (isapnp_create_device(card, size) == 1)
766                                         return;
767                                 size = 0;
768                         }
769                         break;
770                 case _STAG_VENDOR:
771                         break;
772                 case _LTAG_ANSISTR:
773                         isapnp_parse_name(card->name, sizeof(card->name),
774                                           &size);
775                         break;
776                 case _LTAG_UNICODESTR:
777                         /* silently ignore */
778                         /* who use unicode for hardware identification? */
779                         break;
780                 case _LTAG_VENDOR:
781                         break;
782                 case _STAG_END:
783                         if (size > 0)
784                                 isapnp_skip_bytes(size);
785                         return;
786                 default:
787                         printk(KERN_ERR
788                                "isapnp: unexpected or unknown tag type 0x%x for device %i, ignored\n",
789                                type, card->number);
790                 }
791               __skip:
792                 if (size > 0)
793                         isapnp_skip_bytes(size);
794         }
795 }
796
797 /*
798  *  Compute ISA PnP checksum for first eight bytes.
799  */
800 static unsigned char __init isapnp_checksum(unsigned char *data)
801 {
802         int i, j;
803         unsigned char checksum = 0x6a, bit, b;
804
805         for (i = 0; i < 8; i++) {
806                 b = data[i];
807                 for (j = 0; j < 8; j++) {
808                         bit = 0;
809                         if (b & (1 << j))
810                                 bit = 1;
811                         checksum =
812                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
813                             | (checksum >> 1);
814                 }
815         }
816         return checksum;
817 }
818
819 /*
820  *  Parse EISA id for ISA PnP card.
821  */
822 static void isapnp_parse_card_id(struct pnp_card *card, unsigned short vendor,
823                                  unsigned short device)
824 {
825         struct pnp_id *id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
826
827         if (!id)
828                 return;
829         sprintf(id->id, "%c%c%c%x%x%x%x",
830                 'A' + ((vendor >> 2) & 0x3f) - 1,
831                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
832                 'A' + ((vendor >> 8) & 0x1f) - 1,
833                 (device >> 4) & 0x0f,
834                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
835         pnp_add_card_id(id, card);
836 }
837
838 /*
839  *  Build device list for all present ISA PnP devices.
840  */
841 static int __init isapnp_build_device_list(void)
842 {
843         int csn;
844         unsigned char header[9], checksum;
845         struct pnp_card *card;
846
847         isapnp_wait();
848         isapnp_key();
849         for (csn = 1; csn <= isapnp_csn_count; csn++) {
850                 isapnp_wake(csn);
851                 isapnp_peek(header, 9);
852                 checksum = isapnp_checksum(header);
853 #if 0
854                 printk(KERN_DEBUG
855                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
856                        header[0], header[1], header[2], header[3], header[4],
857                        header[5], header[6], header[7], header[8]);
858                 printk(KERN_DEBUG "checksum = 0x%x\n", checksum);
859 #endif
860                 if ((card =
861                      kzalloc(sizeof(struct pnp_card), GFP_KERNEL)) == NULL)
862                         continue;
863
864                 card->number = csn;
865                 INIT_LIST_HEAD(&card->devices);
866                 isapnp_parse_card_id(card, (header[1] << 8) | header[0],
867                                      (header[3] << 8) | header[2]);
868                 card->serial =
869                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
870                     header[4];
871                 isapnp_checksum_value = 0x00;
872                 isapnp_parse_resource_map(card);
873                 if (isapnp_checksum_value != 0x00)
874                         printk(KERN_ERR
875                                "isapnp: checksum for device %i is not valid (0x%x)\n",
876                                csn, isapnp_checksum_value);
877                 card->checksum = isapnp_checksum_value;
878                 card->protocol = &isapnp_protocol;
879
880                 pnp_add_card(card);
881         }
882         isapnp_wait();
883         return 0;
884 }
885
886 /*
887  *  Basic configuration routines.
888  */
889
890 int isapnp_present(void)
891 {
892         struct pnp_card *card;
893
894         pnp_for_each_card(card) {
895                 if (card->protocol == &isapnp_protocol)
896                         return 1;
897         }
898         return 0;
899 }
900
901 int isapnp_cfg_begin(int csn, int logdev)
902 {
903         if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
904                 return -EINVAL;
905         mutex_lock(&isapnp_cfg_mutex);
906         isapnp_wait();
907         isapnp_key();
908         isapnp_wake(csn);
909 #if 0
910         /* to avoid malfunction when the isapnptools package is used */
911         /* we must set RDP to our value again */
912         /* it is possible to set RDP only in the isolation phase */
913         /*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
914         isapnp_write_byte(0x02, 0x04);  /* clear CSN of card */
915         mdelay(2);              /* is this necessary? */
916         isapnp_wake(csn);       /* bring card into sleep state */
917         isapnp_wake(0);         /* bring card into isolation state */
918         isapnp_set_rdp();       /* reset the RDP port */
919         udelay(1000);           /* delay 1000us */
920         isapnp_write_byte(0x06, csn);   /* reset CSN to previous value */
921         udelay(250);            /* is this necessary? */
922 #endif
923         if (logdev >= 0)
924                 isapnp_device(logdev);
925         return 0;
926 }
927
928 int isapnp_cfg_end(void)
929 {
930         isapnp_wait();
931         mutex_unlock(&isapnp_cfg_mutex);
932         return 0;
933 }
934
935 /*
936  *  Initialization.
937  */
938
939 EXPORT_SYMBOL(isapnp_protocol);
940 EXPORT_SYMBOL(isapnp_present);
941 EXPORT_SYMBOL(isapnp_cfg_begin);
942 EXPORT_SYMBOL(isapnp_cfg_end);
943 #if 0
944 EXPORT_SYMBOL(isapnp_read_byte);
945 #endif
946 EXPORT_SYMBOL(isapnp_write_byte);
947
948 static int isapnp_read_resources(struct pnp_dev *dev,
949                                  struct pnp_resource_table *res)
950 {
951         int tmp, ret;
952
953         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
954         if (dev->active) {
955                 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
956                         ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
957                         if (!ret)
958                                 continue;
959                         res->port_resource[tmp].start = ret;
960                         res->port_resource[tmp].flags = IORESOURCE_IO;
961                 }
962                 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
963                         ret =
964                             isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
965                         if (!ret)
966                                 continue;
967                         res->mem_resource[tmp].start = ret;
968                         res->mem_resource[tmp].flags = IORESOURCE_MEM;
969                 }
970                 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
971                         ret =
972                             (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >>
973                              8);
974                         if (!ret)
975                                 continue;
976                         res->irq_resource[tmp].start =
977                             res->irq_resource[tmp].end = ret;
978                         res->irq_resource[tmp].flags = IORESOURCE_IRQ;
979                 }
980                 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
981                         ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
982                         if (ret == 4)
983                                 continue;
984                         res->dma_resource[tmp].start =
985                             res->dma_resource[tmp].end = ret;
986                         res->dma_resource[tmp].flags = IORESOURCE_DMA;
987                 }
988         }
989         return 0;
990 }
991
992 static int isapnp_get_resources(struct pnp_dev *dev,
993                                 struct pnp_resource_table *res)
994 {
995         int ret;
996         pnp_init_resource_table(res);
997         isapnp_cfg_begin(dev->card->number, dev->number);
998         ret = isapnp_read_resources(dev, res);
999         isapnp_cfg_end();
1000         return ret;
1001 }
1002
1003 static int isapnp_set_resources(struct pnp_dev *dev,
1004                                 struct pnp_resource_table *res)
1005 {
1006         int tmp;
1007
1008         isapnp_cfg_begin(dev->card->number, dev->number);
1009         dev->active = 1;
1010         for (tmp = 0;
1011              tmp < PNP_MAX_PORT
1012              && (res->port_resource[tmp].
1013                  flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO;
1014              tmp++)
1015                 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
1016                                   res->port_resource[tmp].start);
1017         for (tmp = 0;
1018              tmp < PNP_MAX_IRQ
1019              && (res->irq_resource[tmp].
1020                  flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ;
1021              tmp++) {
1022                 int irq = res->irq_resource[tmp].start;
1023                 if (irq == 2)
1024                         irq = 9;
1025                 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
1026         }
1027         for (tmp = 0;
1028              tmp < PNP_MAX_DMA
1029              && (res->dma_resource[tmp].
1030                  flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA;
1031              tmp++)
1032                 isapnp_write_byte(ISAPNP_CFG_DMA + tmp,
1033                                   res->dma_resource[tmp].start);
1034         for (tmp = 0;
1035              tmp < PNP_MAX_MEM
1036              && (res->mem_resource[tmp].
1037                  flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM;
1038              tmp++)
1039                 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
1040                                   (res->mem_resource[tmp].start >> 8) & 0xffff);
1041         /* FIXME: We aren't handling 32bit mems properly here */
1042         isapnp_activate(dev->number);
1043         isapnp_cfg_end();
1044         return 0;
1045 }
1046
1047 static int isapnp_disable_resources(struct pnp_dev *dev)
1048 {
1049         if (!dev || !dev->active)
1050                 return -EINVAL;
1051         isapnp_cfg_begin(dev->card->number, dev->number);
1052         isapnp_deactivate(dev->number);
1053         dev->active = 0;
1054         isapnp_cfg_end();
1055         return 0;
1056 }
1057
1058 struct pnp_protocol isapnp_protocol = {
1059         .name = "ISA Plug and Play",
1060         .get = isapnp_get_resources,
1061         .set = isapnp_set_resources,
1062         .disable = isapnp_disable_resources,
1063 };
1064
1065 static int __init isapnp_init(void)
1066 {
1067         int cards;
1068         struct pnp_card *card;
1069         struct pnp_dev *dev;
1070
1071         if (isapnp_disable) {
1072                 isapnp_detected = 0;
1073                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1074                 return 0;
1075         }
1076 #ifdef CONFIG_PPC_MERGE
1077         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1078                 return -EINVAL;
1079 #endif
1080 #ifdef ISAPNP_REGION_OK
1081         if (!request_region(_PIDXR, 1, "isapnp index")) {
1082                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1083                        _PIDXR);
1084                 return -EBUSY;
1085         }
1086 #endif
1087         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1088                 printk(KERN_ERR
1089                        "isapnp: Write Data Register 0x%x already used\n",
1090                        _PNPWRP);
1091 #ifdef ISAPNP_REGION_OK
1092                 release_region(_PIDXR, 1);
1093 #endif
1094                 return -EBUSY;
1095         }
1096
1097         if (pnp_register_protocol(&isapnp_protocol) < 0)
1098                 return -EBUSY;
1099
1100         /*
1101          *      Print a message. The existing ISAPnP code is hanging machines
1102          *      so let the user know where.
1103          */
1104
1105         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1106         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1107                 isapnp_rdp |= 3;
1108                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1109                         printk(KERN_ERR
1110                                "isapnp: Read Data Register 0x%x already used\n",
1111                                isapnp_rdp);
1112 #ifdef ISAPNP_REGION_OK
1113                         release_region(_PIDXR, 1);
1114 #endif
1115                         release_region(_PNPWRP, 1);
1116                         return -EBUSY;
1117                 }
1118                 isapnp_set_rdp();
1119         }
1120         isapnp_detected = 1;
1121         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1122                 cards = isapnp_isolate();
1123                 if (cards < 0 || (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
1130                                "isapnp: No Plug & Play device found\n");
1131                         return 0;
1132                 }
1133                 request_region(isapnp_rdp, 1, "isapnp read");
1134         }
1135         isapnp_build_device_list();
1136         cards = 0;
1137
1138         protocol_for_each_card(&isapnp_protocol, card) {
1139                 cards++;
1140                 if (isapnp_verbose) {
1141                         printk(KERN_INFO "isapnp: Card '%s'\n",
1142                                card->name[0] ? card->name : "Unknown");
1143                         if (isapnp_verbose < 2)
1144                                 continue;
1145                         card_for_each_dev(card, dev) {
1146                                 printk(KERN_INFO "isapnp:   Device '%s'\n",
1147                                        dev->name[0] ? dev->name : "Unknown");
1148                         }
1149                 }
1150         }
1151         if (cards) {
1152                 printk(KERN_INFO
1153                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1154                        cards > 1 ? "s" : "");
1155         } else {
1156                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1157         }
1158
1159         isapnp_proc_init();
1160         return 0;
1161 }
1162
1163 device_initcall(isapnp_init);
1164
1165 /* format is: noisapnp */
1166
1167 static int __init isapnp_setup_disable(char *str)
1168 {
1169         isapnp_disable = 1;
1170         return 1;
1171 }
1172
1173 __setup("noisapnp", isapnp_setup_disable);
1174
1175 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1176
1177 static int __init isapnp_setup_isapnp(char *str)
1178 {
1179         (void)((get_option(&str, &isapnp_rdp) == 2) &&
1180                (get_option(&str, &isapnp_reset) == 2) &&
1181                (get_option(&str, &isapnp_verbose) == 2));
1182         return 1;
1183 }
1184
1185 __setup("isapnp=", isapnp_setup_isapnp);