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