PNP: add pnp_init_resources(struct pnp_dev *) interface
[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->regs = tmp[4];
420         dev->card = card;
421         if (size > 5)
422                 dev->regs |= tmp[5] << 8;
423         dev->capabilities |= PNP_CONFIGURABLE;
424         dev->capabilities |= PNP_READ;
425         dev->capabilities |= PNP_WRITE;
426         dev->capabilities |= PNP_DISABLE;
427         pnp_init_resources(dev);
428         return dev;
429 }
430
431 /*
432  *  Add IRQ resource to resources list.
433  */
434 static void __init isapnp_parse_irq_resource(struct pnp_dev *dev,
435                                              struct pnp_option *option,
436                                              int size)
437 {
438         unsigned char tmp[3];
439         struct pnp_irq *irq;
440         unsigned long bits;
441
442         isapnp_peek(tmp, size);
443         irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
444         if (!irq)
445                 return;
446         bits = (tmp[1] << 8) | tmp[0];
447         bitmap_copy(irq->map, &bits, 16);
448         if (size > 2)
449                 irq->flags = tmp[2];
450         else
451                 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
452         pnp_register_irq_resource(dev, option, irq);
453 }
454
455 /*
456  *  Add DMA resource to resources list.
457  */
458 static void __init isapnp_parse_dma_resource(struct pnp_dev *dev,
459                                              struct pnp_option *option,
460                                              int size)
461 {
462         unsigned char tmp[2];
463         struct pnp_dma *dma;
464
465         isapnp_peek(tmp, size);
466         dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
467         if (!dma)
468                 return;
469         dma->map = tmp[0];
470         dma->flags = tmp[1];
471         pnp_register_dma_resource(dev, option, dma);
472 }
473
474 /*
475  *  Add port resource to resources list.
476  */
477 static void __init isapnp_parse_port_resource(struct pnp_dev *dev,
478                                               struct pnp_option *option,
479                                               int size)
480 {
481         unsigned char tmp[7];
482         struct pnp_port *port;
483
484         isapnp_peek(tmp, size);
485         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
486         if (!port)
487                 return;
488         port->min = (tmp[2] << 8) | tmp[1];
489         port->max = (tmp[4] << 8) | tmp[3];
490         port->align = tmp[5];
491         port->size = tmp[6];
492         port->flags = tmp[0] ? PNP_PORT_FLAG_16BITADDR : 0;
493         pnp_register_port_resource(dev, option, port);
494 }
495
496 /*
497  *  Add fixed port resource to resources list.
498  */
499 static void __init isapnp_parse_fixed_port_resource(struct pnp_dev *dev,
500                                                     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(dev, option, port);
515 }
516
517 /*
518  *  Add memory resource to resources list.
519  */
520 static void __init isapnp_parse_mem_resource(struct pnp_dev *dev,
521                                              struct pnp_option *option,
522                                              int size)
523 {
524         unsigned char tmp[9];
525         struct pnp_mem *mem;
526
527         isapnp_peek(tmp, size);
528         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
529         if (!mem)
530                 return;
531         mem->min = ((tmp[2] << 8) | tmp[1]) << 8;
532         mem->max = ((tmp[4] << 8) | tmp[3]) << 8;
533         mem->align = (tmp[6] << 8) | tmp[5];
534         mem->size = ((tmp[8] << 8) | tmp[7]) << 8;
535         mem->flags = tmp[0];
536         pnp_register_mem_resource(dev, option, mem);
537 }
538
539 /*
540  *  Add 32-bit memory resource to resources list.
541  */
542 static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev,
543                                                struct pnp_option *option,
544                                                int size)
545 {
546         unsigned char tmp[17];
547         struct pnp_mem *mem;
548
549         isapnp_peek(tmp, size);
550         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
551         if (!mem)
552                 return;
553         mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
554         mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
555         mem->align =
556             (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
557         mem->size =
558             (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
559         mem->flags = tmp[0];
560         pnp_register_mem_resource(dev, option, mem);
561 }
562
563 /*
564  *  Add 32-bit fixed memory resource to resources list.
565  */
566 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev,
567                                                      struct pnp_option *option,
568                                                      int size)
569 {
570         unsigned char tmp[9];
571         struct pnp_mem *mem;
572
573         isapnp_peek(tmp, size);
574         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
575         if (!mem)
576                 return;
577         mem->min = mem->max =
578             (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
579         mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
580         mem->align = 0;
581         mem->flags = tmp[0];
582         pnp_register_mem_resource(dev, option, mem);
583 }
584
585 /*
586  *  Parse card name for ISA PnP device.
587  */
588 static void __init
589 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
590 {
591         if (name[0] == '\0') {
592                 unsigned short size1 =
593                     *size >= name_max ? (name_max - 1) : *size;
594                 isapnp_peek(name, size1);
595                 name[size1] = '\0';
596                 *size -= size1;
597
598                 /* clean whitespace from end of string */
599                 while (size1 > 0 && name[--size1] == ' ')
600                         name[size1] = '\0';
601         }
602 }
603
604 /*
605  *  Parse resource map for logical device.
606  */
607 static int __init isapnp_create_device(struct pnp_card *card,
608                                        unsigned short size)
609 {
610         int number = 0, skip = 0, priority = 0, compat = 0;
611         unsigned char type, tmp[17];
612         struct pnp_option *option;
613         struct pnp_dev *dev;
614         u32 eisa_id;
615         char id[8];
616
617         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
618                 return 1;
619         option = pnp_register_independent_option(dev);
620         if (!option) {
621                 kfree(dev);
622                 return 1;
623         }
624         pnp_add_card_device(card, dev);
625
626         while (1) {
627                 if (isapnp_read_tag(&type, &size) < 0)
628                         return 1;
629                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
630                         goto __skip;
631                 switch (type) {
632                 case _STAG_LOGDEVID:
633                         if (size >= 5 && size <= 6) {
634                                 if ((dev =
635                                      isapnp_parse_device(card, size,
636                                                          number++)) == NULL)
637                                         return 1;
638                                 size = 0;
639                                 skip = 0;
640                                 option = pnp_register_independent_option(dev);
641                                 if (!option) {
642                                         kfree(dev);
643                                         return 1;
644                                 }
645                                 pnp_add_card_device(card, dev);
646                         } else {
647                                 skip = 1;
648                         }
649                         priority = 0;
650                         compat = 0;
651                         break;
652                 case _STAG_COMPATDEVID:
653                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
654                                 isapnp_peek(tmp, 4);
655                                 eisa_id = tmp[0] | tmp[1] << 8 |
656                                           tmp[2] << 16 | tmp[3] << 24;
657                                 pnp_eisa_id_to_string(eisa_id, id);
658                                 pnp_add_id(dev, id);
659                                 compat++;
660                                 size = 0;
661                         }
662                         break;
663                 case _STAG_IRQ:
664                         if (size < 2 || size > 3)
665                                 goto __skip;
666                         isapnp_parse_irq_resource(dev, option, size);
667                         size = 0;
668                         break;
669                 case _STAG_DMA:
670                         if (size != 2)
671                                 goto __skip;
672                         isapnp_parse_dma_resource(dev, option, size);
673                         size = 0;
674                         break;
675                 case _STAG_STARTDEP:
676                         if (size > 1)
677                                 goto __skip;
678                         priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
679                         if (size > 0) {
680                                 isapnp_peek(tmp, size);
681                                 priority = 0x100 | tmp[0];
682                                 size = 0;
683                         }
684                         option = pnp_register_dependent_option(dev, priority);
685                         if (!option)
686                                 return 1;
687                         break;
688                 case _STAG_ENDDEP:
689                         if (size != 0)
690                                 goto __skip;
691                         priority = 0;
692                         dev_dbg(&dev->dev, "end dependent options\n");
693                         break;
694                 case _STAG_IOPORT:
695                         if (size != 7)
696                                 goto __skip;
697                         isapnp_parse_port_resource(dev, option, size);
698                         size = 0;
699                         break;
700                 case _STAG_FIXEDIO:
701                         if (size != 3)
702                                 goto __skip;
703                         isapnp_parse_fixed_port_resource(dev, option, size);
704                         size = 0;
705                         break;
706                 case _STAG_VENDOR:
707                         break;
708                 case _LTAG_MEMRANGE:
709                         if (size != 9)
710                                 goto __skip;
711                         isapnp_parse_mem_resource(dev, option, size);
712                         size = 0;
713                         break;
714                 case _LTAG_ANSISTR:
715                         isapnp_parse_name(dev->name, sizeof(dev->name), &size);
716                         break;
717                 case _LTAG_UNICODESTR:
718                         /* silently ignore */
719                         /* who use unicode for hardware identification? */
720                         break;
721                 case _LTAG_VENDOR:
722                         break;
723                 case _LTAG_MEM32RANGE:
724                         if (size != 17)
725                                 goto __skip;
726                         isapnp_parse_mem32_resource(dev, option, size);
727                         size = 0;
728                         break;
729                 case _LTAG_FIXEDMEM32RANGE:
730                         if (size != 9)
731                                 goto __skip;
732                         isapnp_parse_fixed_mem32_resource(dev, option, size);
733                         size = 0;
734                         break;
735                 case _STAG_END:
736                         if (size > 0)
737                                 isapnp_skip_bytes(size);
738                         return 1;
739                 default:
740                         printk(KERN_ERR
741                                "isapnp: unexpected or unknown tag type 0x%x for logical device %i (device %i), ignored\n",
742                                type, dev->number, card->number);
743                 }
744 __skip:
745                 if (size > 0)
746                         isapnp_skip_bytes(size);
747         }
748         return 0;
749 }
750
751 /*
752  *  Parse resource map for ISA PnP card.
753  */
754 static void __init isapnp_parse_resource_map(struct pnp_card *card)
755 {
756         unsigned char type, tmp[17];
757         unsigned short size;
758
759         while (1) {
760                 if (isapnp_read_tag(&type, &size) < 0)
761                         return;
762                 switch (type) {
763                 case _STAG_PNPVERNO:
764                         if (size != 2)
765                                 goto __skip;
766                         isapnp_peek(tmp, 2);
767                         card->pnpver = tmp[0];
768                         card->productver = tmp[1];
769                         size = 0;
770                         break;
771                 case _STAG_LOGDEVID:
772                         if (size >= 5 && size <= 6) {
773                                 if (isapnp_create_device(card, size) == 1)
774                                         return;
775                                 size = 0;
776                         }
777                         break;
778                 case _STAG_VENDOR:
779                         break;
780                 case _LTAG_ANSISTR:
781                         isapnp_parse_name(card->name, sizeof(card->name),
782                                           &size);
783                         break;
784                 case _LTAG_UNICODESTR:
785                         /* silently ignore */
786                         /* who use unicode for hardware identification? */
787                         break;
788                 case _LTAG_VENDOR:
789                         break;
790                 case _STAG_END:
791                         if (size > 0)
792                                 isapnp_skip_bytes(size);
793                         return;
794                 default:
795                         printk(KERN_ERR
796                                "isapnp: unexpected or unknown tag type 0x%x for device %i, ignored\n",
797                                type, card->number);
798                 }
799 __skip:
800                 if (size > 0)
801                         isapnp_skip_bytes(size);
802         }
803 }
804
805 /*
806  *  Compute ISA PnP checksum for first eight bytes.
807  */
808 static unsigned char __init isapnp_checksum(unsigned char *data)
809 {
810         int i, j;
811         unsigned char checksum = 0x6a, bit, b;
812
813         for (i = 0; i < 8; i++) {
814                 b = data[i];
815                 for (j = 0; j < 8; j++) {
816                         bit = 0;
817                         if (b & (1 << j))
818                                 bit = 1;
819                         checksum =
820                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
821                             | (checksum >> 1);
822                 }
823         }
824         return checksum;
825 }
826
827 /*
828  *  Build device list for all present ISA PnP devices.
829  */
830 static int __init isapnp_build_device_list(void)
831 {
832         int csn;
833         unsigned char header[9], checksum;
834         struct pnp_card *card;
835         u32 eisa_id;
836         char id[8];
837
838         isapnp_wait();
839         isapnp_key();
840         for (csn = 1; csn <= isapnp_csn_count; csn++) {
841                 isapnp_wake(csn);
842                 isapnp_peek(header, 9);
843                 checksum = isapnp_checksum(header);
844 #if 0
845                 printk(KERN_DEBUG
846                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
847                        header[0], header[1], header[2], header[3], header[4],
848                        header[5], header[6], header[7], header[8]);
849                 printk(KERN_DEBUG "checksum = 0x%x\n", checksum);
850 #endif
851                 eisa_id = header[0] | header[1] << 8 |
852                           header[2] << 16 | header[3] << 24;
853                 pnp_eisa_id_to_string(eisa_id, id);
854                 card = pnp_alloc_card(&isapnp_protocol, csn, id);
855                 if (!card)
856                         continue;
857
858                 INIT_LIST_HEAD(&card->devices);
859                 card->serial =
860                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
861                     header[4];
862                 isapnp_checksum_value = 0x00;
863                 isapnp_parse_resource_map(card);
864                 if (isapnp_checksum_value != 0x00)
865                         printk(KERN_ERR
866                                "isapnp: checksum for device %i is not valid (0x%x)\n",
867                                csn, isapnp_checksum_value);
868                 card->checksum = isapnp_checksum_value;
869
870                 pnp_add_card(card);
871         }
872         isapnp_wait();
873         return 0;
874 }
875
876 /*
877  *  Basic configuration routines.
878  */
879
880 int isapnp_present(void)
881 {
882         struct pnp_card *card;
883
884         pnp_for_each_card(card) {
885                 if (card->protocol == &isapnp_protocol)
886                         return 1;
887         }
888         return 0;
889 }
890
891 int isapnp_cfg_begin(int csn, int logdev)
892 {
893         if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
894                 return -EINVAL;
895         mutex_lock(&isapnp_cfg_mutex);
896         isapnp_wait();
897         isapnp_key();
898         isapnp_wake(csn);
899 #if 0
900         /* to avoid malfunction when the isapnptools package is used */
901         /* we must set RDP to our value again */
902         /* it is possible to set RDP only in the isolation phase */
903         /*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
904         isapnp_write_byte(0x02, 0x04);  /* clear CSN of card */
905         mdelay(2);              /* is this necessary? */
906         isapnp_wake(csn);       /* bring card into sleep state */
907         isapnp_wake(0);         /* bring card into isolation state */
908         isapnp_set_rdp();       /* reset the RDP port */
909         udelay(1000);           /* delay 1000us */
910         isapnp_write_byte(0x06, csn);   /* reset CSN to previous value */
911         udelay(250);            /* is this necessary? */
912 #endif
913         if (logdev >= 0)
914                 isapnp_device(logdev);
915         return 0;
916 }
917
918 int isapnp_cfg_end(void)
919 {
920         isapnp_wait();
921         mutex_unlock(&isapnp_cfg_mutex);
922         return 0;
923 }
924
925 /*
926  *  Initialization.
927  */
928
929 EXPORT_SYMBOL(isapnp_protocol);
930 EXPORT_SYMBOL(isapnp_present);
931 EXPORT_SYMBOL(isapnp_cfg_begin);
932 EXPORT_SYMBOL(isapnp_cfg_end);
933 EXPORT_SYMBOL(isapnp_write_byte);
934
935 static int isapnp_read_resources(struct pnp_dev *dev)
936 {
937         struct pnp_resource_table *res = &dev->res;
938         int tmp, ret;
939
940         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
941         if (dev->active) {
942                 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
943                         ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
944                         if (!ret)
945                                 continue;
946                         res->port_resource[tmp].start = ret;
947                         res->port_resource[tmp].flags = IORESOURCE_IO;
948                 }
949                 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
950                         ret =
951                             isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
952                         if (!ret)
953                                 continue;
954                         res->mem_resource[tmp].start = ret;
955                         res->mem_resource[tmp].flags = IORESOURCE_MEM;
956                 }
957                 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
958                         ret =
959                             (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >>
960                              8);
961                         if (!ret)
962                                 continue;
963                         res->irq_resource[tmp].start =
964                             res->irq_resource[tmp].end = ret;
965                         res->irq_resource[tmp].flags = IORESOURCE_IRQ;
966                 }
967                 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
968                         ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
969                         if (ret == 4)
970                                 continue;
971                         res->dma_resource[tmp].start =
972                             res->dma_resource[tmp].end = ret;
973                         res->dma_resource[tmp].flags = IORESOURCE_DMA;
974                 }
975         }
976         return 0;
977 }
978
979 static int isapnp_get_resources(struct pnp_dev *dev)
980 {
981         int ret;
982
983         dev_dbg(&dev->dev, "get resources\n");
984         pnp_init_resources(dev);
985         isapnp_cfg_begin(dev->card->number, dev->number);
986         ret = isapnp_read_resources(dev);
987         isapnp_cfg_end();
988         return ret;
989 }
990
991 static int isapnp_set_resources(struct pnp_dev *dev)
992 {
993         struct pnp_resource_table *res = &dev->res;
994         int tmp;
995
996         dev_dbg(&dev->dev, "set resources\n");
997         isapnp_cfg_begin(dev->card->number, dev->number);
998         dev->active = 1;
999         for (tmp = 0;
1000              tmp < ISAPNP_MAX_PORT
1001              && (res->port_resource[tmp].
1002                  flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO;
1003              tmp++) {
1004                 dev_dbg(&dev->dev, "  set io  %d to %#llx\n",
1005                         tmp, (unsigned long long) res->port_resource[tmp].start);
1006                 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
1007                                   res->port_resource[tmp].start);
1008         }
1009         for (tmp = 0;
1010              tmp < ISAPNP_MAX_IRQ
1011              && (res->irq_resource[tmp].
1012                  flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ;
1013              tmp++) {
1014                 int irq = res->irq_resource[tmp].start;
1015                 if (irq == 2)
1016                         irq = 9;
1017                 dev_dbg(&dev->dev, "  set irq %d to %d\n", tmp, irq);
1018                 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
1019         }
1020         for (tmp = 0;
1021              tmp < ISAPNP_MAX_DMA
1022              && (res->dma_resource[tmp].
1023                  flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA;
1024              tmp++) {
1025                 dev_dbg(&dev->dev, "  set dma %d to %lld\n",
1026                         tmp, (unsigned long long) res->dma_resource[tmp].start);
1027                 isapnp_write_byte(ISAPNP_CFG_DMA + tmp,
1028                                   res->dma_resource[tmp].start);
1029         }
1030         for (tmp = 0;
1031              tmp < ISAPNP_MAX_MEM
1032              && (res->mem_resource[tmp].
1033                  flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM;
1034              tmp++) {
1035                 dev_dbg(&dev->dev, "  set mem %d to %#llx\n",
1036                         tmp, (unsigned long long) res->mem_resource[tmp].start);
1037                 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
1038                                   (res->mem_resource[tmp].start >> 8) & 0xffff);
1039         }
1040         /* FIXME: We aren't handling 32bit mems properly here */
1041         isapnp_activate(dev->number);
1042         isapnp_cfg_end();
1043         return 0;
1044 }
1045
1046 static int isapnp_disable_resources(struct pnp_dev *dev)
1047 {
1048         if (!dev->active)
1049                 return -EINVAL;
1050         isapnp_cfg_begin(dev->card->number, dev->number);
1051         isapnp_deactivate(dev->number);
1052         dev->active = 0;
1053         isapnp_cfg_end();
1054         return 0;
1055 }
1056
1057 struct pnp_protocol isapnp_protocol = {
1058         .name = "ISA Plug and Play",
1059         .get = isapnp_get_resources,
1060         .set = isapnp_set_resources,
1061         .disable = isapnp_disable_resources,
1062 };
1063
1064 static int __init isapnp_init(void)
1065 {
1066         int cards;
1067         struct pnp_card *card;
1068         struct pnp_dev *dev;
1069
1070         if (isapnp_disable) {
1071                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1072                 return 0;
1073         }
1074 #ifdef CONFIG_PPC_MERGE
1075         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1076                 return -EINVAL;
1077 #endif
1078 #ifdef ISAPNP_REGION_OK
1079         if (!request_region(_PIDXR, 1, "isapnp index")) {
1080                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1081                        _PIDXR);
1082                 return -EBUSY;
1083         }
1084 #endif
1085         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1086                 printk(KERN_ERR
1087                        "isapnp: Write Data Register 0x%x already used\n",
1088                        _PNPWRP);
1089 #ifdef ISAPNP_REGION_OK
1090                 release_region(_PIDXR, 1);
1091 #endif
1092                 return -EBUSY;
1093         }
1094
1095         if (pnp_register_protocol(&isapnp_protocol) < 0)
1096                 return -EBUSY;
1097
1098         /*
1099          *      Print a message. The existing ISAPnP code is hanging machines
1100          *      so let the user know where.
1101          */
1102
1103         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1104         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1105                 isapnp_rdp |= 3;
1106                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1107                         printk(KERN_ERR
1108                                "isapnp: Read Data Register 0x%x already used\n",
1109                                isapnp_rdp);
1110 #ifdef ISAPNP_REGION_OK
1111                         release_region(_PIDXR, 1);
1112 #endif
1113                         release_region(_PNPWRP, 1);
1114                         return -EBUSY;
1115                 }
1116                 isapnp_set_rdp();
1117         }
1118         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1119                 cards = isapnp_isolate();
1120                 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1121 #ifdef ISAPNP_REGION_OK
1122                         release_region(_PIDXR, 1);
1123 #endif
1124                         release_region(_PNPWRP, 1);
1125                         printk(KERN_INFO
1126                                "isapnp: No Plug & Play device found\n");
1127                         return 0;
1128                 }
1129                 request_region(isapnp_rdp, 1, "isapnp read");
1130         }
1131         isapnp_build_device_list();
1132         cards = 0;
1133
1134         protocol_for_each_card(&isapnp_protocol, card) {
1135                 cards++;
1136                 if (isapnp_verbose) {
1137                         printk(KERN_INFO "isapnp: Card '%s'\n",
1138                                card->name[0] ? card->name : "Unknown");
1139                         if (isapnp_verbose < 2)
1140                                 continue;
1141                         card_for_each_dev(card, dev) {
1142                                 printk(KERN_INFO "isapnp:   Device '%s'\n",
1143                                        dev->name[0] ? dev->name : "Unknown");
1144                         }
1145                 }
1146         }
1147         if (cards)
1148                 printk(KERN_INFO
1149                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1150                        cards > 1 ? "s" : "");
1151         else
1152                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
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);