drivers/pnp/isapnp/core.c

   1 /*
   2  *  ISA Plug & Play support
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  *  Changelog:
  21  *  2000-01-01  Added quirks handling for buggy hardware
  22  *              Peter Denison <peterd@pnd-pc.demon.co.uk>
  23  *  2000-06-14  Added isapnp_probe_devs() and isapnp_activate_dev()
  24  *              Christoph Hellwig <hch@infradead.org>
  25  *  2001-06-03  Added release_region calls to correspond with
  26  *              request_region calls when a failure occurs.  Also
  27  *              added KERN_* constants to printk() calls.
  28  *  2001-11-07  Added isapnp_{,un}register_driver calls along the lines
  29  *              of the pci driver interface
  30  *              Kai Germaschewski <kai.germaschewski@gmx.de>
  31  *  2002-06-06  Made the use of dma channel 0 configurable
  32  *              Gerald Teschl <gerald.teschl@univie.ac.at>
  33  *  2002-10-06  Ported to PnP Layer - Adam Belay <ambx1@neo.rr.com>
  34  *  2003-08-11  Resource Management Updates - Adam Belay <ambx1@neo.rr.com>
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  40 #include <linux/slab.h>
  41 #include <linux/delay.h>
  42 #include <linux/init.h>
  43 #include <linux/isapnp.h>
  44 #include <linux/mutex.h>
  45 #include <asm/io.h>
  46
  47 #include "../base.h"
  48
  49 #if 0
  50 #define ISAPNP_REGION_OK
  51 #endif
  52
  53 int isapnp_disable;             /* Disable ISA PnP */
  54 static int isapnp_rdp;          /* Read Data Port */
  55 static int isapnp_reset = 1;    /* reset all PnP cards (deactivate) */
  56 static int isapnp_verbose = 1;  /* verbose mode */
  57
  58 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  59 MODULE_DESCRIPTION("Generic ISA Plug & Play support");
  60 module_param(isapnp_disable, int, 0);
  61 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable");
  62 module_param(isapnp_rdp, int, 0);
  63 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
  64 module_param(isapnp_reset, int, 0);
  65 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
  66 module_param(isapnp_verbose, int, 0);
  67 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
  68 MODULE_LICENSE("GPL");
  69
  70 #define _PIDXR          0x279
  71 #define _PNPWRP         0xa79
  72
  73 /* short tags */
  74 #define _STAG_PNPVERNO          0x01
  75 #define _STAG_LOGDEVID          0x02
  76 #define _STAG_COMPATDEVID       0x03
  77 #define _STAG_IRQ               0x04
  78 #define _STAG_DMA               0x05
  79 #define _STAG_STARTDEP          0x06
  80 #define _STAG_ENDDEP            0x07
  81 #define _STAG_IOPORT            0x08
  82 #define _STAG_FIXEDIO           0x09
  83 #define _STAG_VENDOR            0x0e
  84 #define _STAG_END               0x0f
  85 /* long tags */
  86 #define _LTAG_MEMRANGE          0x81
  87 #define _LTAG_ANSISTR           0x82
  88 #define _LTAG_UNICODESTR        0x83
  89 #define _LTAG_VENDOR            0x84
  90 #define _LTAG_MEM32RANGE        0x85
  91 #define _LTAG_FIXEDMEM32RANGE   0x86
  92
  93 /* Logical device control and configuration registers */
  94
  95 #define ISAPNP_CFG_ACTIVATE     0x30    /* byte */
  96 #define ISAPNP_CFG_MEM          0x40    /* 4 * dword */
  97 #define ISAPNP_CFG_PORT         0x60    /* 8 * word */
  98 #define ISAPNP_CFG_IRQ          0x70    /* 2 * word */
  99 #define ISAPNP_CFG_DMA          0x74    /* 2 * byte */
 100
 101 /*
 102  * Sizes of ISAPNP logical device configuration register sets.
 103  * See PNP-ISA-v1.0a.pdf, Appendix A.
 104  */
 105 #define ISAPNP_MAX_MEM          4
 106 #define ISAPNP_MAX_PORT         8
 107 #define ISAPNP_MAX_IRQ          2
 108 #define ISAPNP_MAX_DMA          2
 109
 110 static unsigned char isapnp_checksum_value;
 111 static DEFINE_MUTEX(isapnp_cfg_mutex);
 112 static int isapnp_csn_count;
 113
 114 /* some prototypes */
 115
 116 static inline void write_data(unsigned char x)
 117 {
 118         outb(x, _PNPWRP);
 119 }
 120
 121 static inline void write_address(unsigned char x)
 122 {
 123         outb(x, _PIDXR);
 124         udelay(20);
 125 }
 126
 127 static inline unsigned char read_data(void)
 128 {
 129         unsigned char val = inb(isapnp_rdp);
 130         return val;
 131 }
 132
 133 unsigned char isapnp_read_byte(unsigned char idx)
 134 {
 135         write_address(idx);
 136         return read_data();
 137 }
 138
 139 static unsigned short isapnp_read_word(unsigned char idx)
 140 {
 141         unsigned short val;
 142
 143         val = isapnp_read_byte(idx);
 144         val = (val << 8) + isapnp_read_byte(idx + 1);
 145         return val;
 146 }
 147
 148 void isapnp_write_byte(unsigned char idx, unsigned char val)
 149 {
 150         write_address(idx);
 151         write_data(val);
 152 }
 153
 154 static void isapnp_write_word(unsigned char idx, unsigned short val)
 155 {
 156         isapnp_write_byte(idx, val >> 8);
 157         isapnp_write_byte(idx + 1, val);
 158 }
 159
 160 static void isapnp_key(void)
 161 {
 162         unsigned char code = 0x6a, msb;
 163         int i;
 164
 165         mdelay(1);
 166         write_address(0x00);
 167         write_address(0x00);
 168
 169         write_address(code);
 170
 171         for (i = 1; i < 32; i++) {
 172                 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
 173                 code = (code >> 1) | msb;
 174                 write_address(code);
 175         }
 176 }
 177
 178 /* place all pnp cards in wait-for-key state */
 179 static void isapnp_wait(void)
 180 {
 181         isapnp_write_byte(0x02, 0x02);
 182 }
 183
 184 static void isapnp_wake(unsigned char csn)
 185 {
 186         isapnp_write_byte(0x03, csn);
 187 }
 188
 189 static void isapnp_device(unsigned char logdev)
 190 {
 191         isapnp_write_byte(0x07, logdev);
 192 }
 193
 194 static void isapnp_activate(unsigned char logdev)
 195 {
 196         isapnp_device(logdev);
 197         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
 198         udelay(250);
 199 }
 200
 201 static void isapnp_deactivate(unsigned char logdev)
 202 {
 203         isapnp_device(logdev);
 204         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
 205         udelay(500);
 206 }
 207
 208 static void __init isapnp_peek(unsigned char *data, int bytes)
 209 {
 210         int i, j;
 211         unsigned char d = 0;
 212
 213         for (i = 1; i <= bytes; i++) {
 214                 for (j = 0; j < 20; j++) {
 215                         d = isapnp_read_byte(0x05);
 216                         if (d & 1)
 217                                 break;
 218                         udelay(100);
 219                 }
 220                 if (!(d & 1)) {
 221                         if (data != NULL)
 222                                 *data++ = 0xff;
 223                         continue;
 224                 }
 225                 d = isapnp_read_byte(0x04);     /* PRESDI */
 226                 isapnp_checksum_value += d;
 227                 if (data != NULL)
 228                         *data++ = d;
 229         }
 230 }
 231
 232 #define RDP_STEP        32      /* minimum is 4 */
 233
 234 static int isapnp_next_rdp(void)
 235 {
 236         int rdp = isapnp_rdp;
 237         static int old_rdp = 0;
 238
 239         if (old_rdp) {
 240                 release_region(old_rdp, 1);
 241                 old_rdp = 0;
 242         }
 243         while (rdp <= 0x3ff) {
 244                 /*
 245                  *      We cannot use NE2000 probe spaces for ISAPnP or we
 246                  *      will lock up machines.
 247                  */
 248                 if ((rdp < 0x280 || rdp > 0x380)
 249                     && request_region(rdp, 1, "ISAPnP")) {
 250                         isapnp_rdp = rdp;
 251                         old_rdp = rdp;
 252                         return 0;
 253                 }
 254                 rdp += RDP_STEP;
 255         }
 256         return -1;
 257 }
 258
 259 /* Set read port address */
 260 static inline void isapnp_set_rdp(void)
 261 {
 262         isapnp_write_byte(0x00, isapnp_rdp >> 2);
 263         udelay(100);
 264 }
 265
 266 /*
 267  *      Perform an isolation. The port selection code now tries to avoid
 268  *      "dangerous to read" ports.
 269  */
 270 static int __init isapnp_isolate_rdp_select(void)
 271 {
 272         isapnp_wait();
 273         isapnp_key();
 274
 275         /* Control: reset CSN and conditionally everything else too */
 276         isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
 277         mdelay(2);
 278
 279         isapnp_wait();
 280         isapnp_key();
 281         isapnp_wake(0x00);
 282
 283         if (isapnp_next_rdp() < 0) {
 284                 isapnp_wait();
 285                 return -1;
 286         }
 287
 288         isapnp_set_rdp();
 289         udelay(1000);
 290         write_address(0x01);
 291         udelay(1000);
 292         return 0;
 293 }
 294
 295 /*
 296  *  Isolate (assign uniqued CSN) to all ISA PnP devices.
 297  */
 298 static int __init isapnp_isolate(void)
 299 {
 300         unsigned char checksum = 0x6a;
 301         unsigned char chksum = 0x00;
 302         unsigned char bit = 0x00;
 303         int data;
 304         int csn = 0;
 305         int i;
 306         int iteration = 1;
 307
 308         isapnp_rdp = 0x213;
 309         if (isapnp_isolate_rdp_select() < 0)
 310                 return -1;
 311
 312         while (1) {
 313                 for (i = 1; i <= 64; i++) {
 314                         data = read_data() << 8;
 315                         udelay(250);
 316                         data = data | read_data();
 317                         udelay(250);
 318                         if (data == 0x55aa)
 319                                 bit = 0x01;
 320                         checksum =
 321                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 322                             | (checksum >> 1);
 323                         bit = 0x00;
 324                 }
 325                 for (i = 65; i <= 72; i++) {
 326                         data = read_data() << 8;
 327                         udelay(250);
 328                         data = data | read_data();
 329                         udelay(250);
 330                         if (data == 0x55aa)
 331                                 chksum |= (1 << (i - 65));
 332                 }
 333                 if (checksum != 0x00 && checksum == chksum) {
 334                         csn++;
 335
 336                         isapnp_write_byte(0x06, csn);
 337                         udelay(250);
 338                         iteration++;
 339                         isapnp_wake(0x00);
 340                         isapnp_set_rdp();
 341                         udelay(1000);
 342                         write_address(0x01);
 343                         udelay(1000);
 344                         goto __next;
 345                 }
 346                 if (iteration == 1) {
 347                         isapnp_rdp += RDP_STEP;
 348                         if (isapnp_isolate_rdp_select() < 0)
 349                                 return -1;
 350                 } else if (iteration > 1) {
 351                         break;
 352                 }
 353 __next:
 354                 if (csn == 255)
 355                         break;
 356                 checksum = 0x6a;
 357                 chksum = 0x00;
 358                 bit = 0x00;
 359         }
 360         isapnp_wait();
 361         isapnp_csn_count = csn;
 362         return csn;
 363 }
 364
 365 /*
 366  *  Read one tag from stream.
 367  */
 368 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
 369 {
 370         unsigned char tag, tmp[2];
 371
 372         isapnp_peek(&tag, 1);
 373         if (tag == 0)           /* invalid tag */
 374                 return -1;
 375         if (tag & 0x80) {       /* large item */
 376                 *type = tag;
 377                 isapnp_peek(tmp, 2);
 378                 *size = (tmp[1] << 8) | tmp[0];
 379         } else {
 380                 *type = (tag >> 3) & 0x0f;
 381                 *size = tag & 0x07;
 382         }
 383 #if 0
 384         printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type,
 385                *size);
 386 #endif
 387         if (*type == 0xff && *size == 0xffff)   /* probably invalid data */
 388                 return -1;
 389         return 0;
 390 }
 391
 392 /*
 393  *  Skip specified number of bytes from stream.
 394  */
 395 static void __init isapnp_skip_bytes(int count)
 396 {
 397         isapnp_peek(NULL, count);
 398 }
 399
 400 /*
 401  *  Parse logical device tag.
 402  */
 403 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
 404                                                   int size, int number)
 405 {
 406         unsigned char tmp[6];
 407         struct pnp_dev *dev;
 408         u32 eisa_id;
 409         char id[8];
 410
 411         isapnp_peek(tmp, size);
 412         eisa_id = tmp[0] | tmp[1] << 8 | tmp[2] << 16 | tmp[3] << 24;
 413         pnp_eisa_id_to_string(eisa_id, id);
 414
 415         dev = pnp_alloc_dev(&isapnp_protocol, number, id);
 416         if (!dev)
 417                 return NULL;
 418
 419         dev->card = card;
 420         dev->capabilities |= PNP_CONFIGURABLE;
 421         dev->capabilities |= PNP_READ;
 422         dev->capabilities |= PNP_WRITE;
 423         dev->capabilities |= PNP_DISABLE;
 424         pnp_init_resources(dev);
 425         return dev;
 426 }
 427
 428 /*
 429  *  Add IRQ resource to resources list.
 430  */
 431 static void __init isapnp_parse_irq_resource(struct pnp_dev *dev,
 432                                              unsigned int option_flags,
 433                                              int size)
 434 {
 435         unsigned char tmp[3];
 436         unsigned long bits;
 437         pnp_irq_mask_t map;
 438         unsigned char flags = IORESOURCE_IRQ_HIGHEDGE;
 439
 440         isapnp_peek(tmp, size);
 441         bits = (tmp[1] << 8) | tmp[0];
 442
 443         bitmap_zero(map.bits, PNP_IRQ_NR);
 444         bitmap_copy(map.bits, &bits, 16);
 445
 446         if (size > 2)
 447                 flags = tmp[2];
 448
 449         pnp_register_irq_resource(dev, option_flags, &map, flags);
 450 }
 451
 452 /*
 453  *  Add DMA resource to resources list.
 454  */
 455 static void __init isapnp_parse_dma_resource(struct pnp_dev *dev,
 456                                              unsigned int option_flags,
 457                                              int size)
 458 {
 459         unsigned char tmp[2];
 460
 461         isapnp_peek(tmp, size);
 462         pnp_register_dma_resource(dev, option_flags, tmp[0], tmp[1]);
 463 }
 464
 465 /*
 466  *  Add port resource to resources list.
 467  */
 468 static void __init isapnp_parse_port_resource(struct pnp_dev *dev,
 469                                               unsigned int option_flags,
 470                                               int size)
 471 {
 472         unsigned char tmp[7];
 473         resource_size_t min, max, align, len;
 474         unsigned char flags;
 475
 476         isapnp_peek(tmp, size);
 477         min = (tmp[2] << 8) | tmp[1];
 478         max = (tmp[4] << 8) | tmp[3];
 479         align = tmp[5];
 480         len = tmp[6];
 481         flags = tmp[0] ? IORESOURCE_IO_16BIT_ADDR : 0;
 482         pnp_register_port_resource(dev, option_flags,
 483                                    min, max, align, len, flags);
 484 }
 485
 486 /*
 487  *  Add fixed port resource to resources list.
 488  */
 489 static void __init isapnp_parse_fixed_port_resource(struct pnp_dev *dev,
 490                                                     unsigned int option_flags,
 491                                                     int size)
 492 {
 493         unsigned char tmp[3];
 494         resource_size_t base, len;
 495
 496         isapnp_peek(tmp, size);
 497         base = (tmp[1] << 8) | tmp[0];
 498         len = tmp[2];
 499         pnp_register_port_resource(dev, option_flags, base, base, 0, len,
 500                                    IORESOURCE_IO_FIXED);
 501 }
 502
 503 /*
 504  *  Add memory resource to resources list.
 505  */
 506 static void __init isapnp_parse_mem_resource(struct pnp_dev *dev,
 507                                              unsigned int option_flags,
 508                                              int size)
 509 {
 510         unsigned char tmp[9];
 511         resource_size_t min, max, align, len;
 512         unsigned char flags;
 513
 514         isapnp_peek(tmp, size);
 515         min = ((tmp[2] << 8) | tmp[1]) << 8;
 516         max = ((tmp[4] << 8) | tmp[3]) << 8;
 517         align = (tmp[6] << 8) | tmp[5];
 518         len = ((tmp[8] << 8) | tmp[7]) << 8;
 519         flags = tmp[0];
 520         pnp_register_mem_resource(dev, option_flags,
 521                                   min, max, align, len, flags);
 522 }
 523
 524 /*
 525  *  Add 32-bit memory resource to resources list.
 526  */
 527 static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev,
 528                                                unsigned int option_flags,
 529                                                int size)
 530 {
 531         unsigned char tmp[17];
 532         resource_size_t min, max, align, len;
 533         unsigned char flags;
 534
 535         isapnp_peek(tmp, size);
 536         min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 537         max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 538         align = (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
 539         len = (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
 540         flags = tmp[0];
 541         pnp_register_mem_resource(dev, option_flags,
 542                                   min, max, align, len, flags);
 543 }
 544
 545 /*
 546  *  Add 32-bit fixed memory resource to resources list.
 547  */
 548 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev,
 549                                                      unsigned int option_flags,
 550                                                      int size)
 551 {
 552         unsigned char tmp[9];
 553         resource_size_t base, len;
 554         unsigned char flags;
 555
 556         isapnp_peek(tmp, size);
 557         base = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 558         len = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 559         flags = tmp[0];
 560         pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags);
 561 }
 562
 563 /*
 564  *  Parse card name for ISA PnP device.
 565  */
 566 static void __init
 567 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
 568 {
 569         if (name[0] == '\0') {
 570                 unsigned short size1 =
 571                     *size >= name_max ? (name_max - 1) : *size;
 572                 isapnp_peek(name, size1);
 573                 name[size1] = '\0';
 574                 *size -= size1;
 575
 576                 /* clean whitespace from end of string */
 577                 while (size1 > 0 && name[--size1] == ' ')
 578                         name[size1] = '\0';
 579         }
 580 }
 581
 582 /*
 583  *  Parse resource map for logical device.
 584  */
 585 static int __init isapnp_create_device(struct pnp_card *card,
 586                                        unsigned short size)
 587 {
 588         int number = 0, skip = 0, priority, compat = 0;
 589         unsigned char type, tmp[17];
 590         unsigned int option_flags;
 591         struct pnp_dev *dev;
 592         u32 eisa_id;
 593         char id[8];
 594
 595         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
 596                 return 1;
 597         option_flags = 0;
 598         pnp_add_card_device(card, dev);
 599
 600         while (1) {
 601                 if (isapnp_read_tag(&type, &size) < 0)
 602                         return 1;
 603                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
 604                         goto __skip;
 605                 switch (type) {
 606                 case _STAG_LOGDEVID:
 607                         if (size >= 5 && size <= 6) {
 608                                 if ((dev =
 609                                      isapnp_parse_device(card, size,
 610                                                          number++)) == NULL)
 611                                         return 1;
 612                                 size = 0;
 613                                 skip = 0;
 614                                 option_flags = 0;
 615                                 pnp_add_card_device(card, dev);
 616                         } else {
 617                                 skip = 1;
 618                         }
 619                         compat = 0;
 620                         break;
 621                 case _STAG_COMPATDEVID:
 622                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
 623                                 isapnp_peek(tmp, 4);
 624                                 eisa_id = tmp[0] | tmp[1] << 8 |
 625                                           tmp[2] << 16 | tmp[3] << 24;
 626                                 pnp_eisa_id_to_string(eisa_id, id);
 627                                 pnp_add_id(dev, id);
 628                                 compat++;
 629                                 size = 0;
 630                         }
 631                         break;
 632                 case _STAG_IRQ:
 633                         if (size < 2 || size > 3)
 634                                 goto __skip;
 635                         isapnp_parse_irq_resource(dev, option_flags, size);
 636                         size = 0;
 637                         break;
 638                 case _STAG_DMA:
 639                         if (size != 2)
 640                                 goto __skip;
 641                         isapnp_parse_dma_resource(dev, option_flags, size);
 642                         size = 0;
 643                         break;
 644                 case _STAG_STARTDEP:
 645                         if (size > 1)
 646                                 goto __skip;
 647                         priority = PNP_RES_PRIORITY_ACCEPTABLE;
 648                         if (size > 0) {
 649                                 isapnp_peek(tmp, size);
 650                                 priority = tmp[0];
 651                                 size = 0;
 652                         }
 653                         option_flags = pnp_new_dependent_set(dev, priority);
 654                         break;
 655                 case _STAG_ENDDEP:
 656                         if (size != 0)
 657                                 goto __skip;
 658                         option_flags = 0;
 659                         break;
 660                 case _STAG_IOPORT:
 661                         if (size != 7)
 662                                 goto __skip;
 663                         isapnp_parse_port_resource(dev, option_flags, size);
 664                         size = 0;
 665                         break;
 666                 case _STAG_FIXEDIO:
 667                         if (size != 3)
 668                                 goto __skip;
 669                         isapnp_parse_fixed_port_resource(dev, option_flags,
 670                                                          size);
 671                         size = 0;
 672                         break;
 673                 case _STAG_VENDOR:
 674                         break;
 675                 case _LTAG_MEMRANGE:
 676                         if (size != 9)
 677                                 goto __skip;
 678                         isapnp_parse_mem_resource(dev, option_flags, size);
 679                         size = 0;
 680                         break;
 681                 case _LTAG_ANSISTR:
 682                         isapnp_parse_name(dev->name, sizeof(dev->name), &size);
 683                         break;
 684                 case _LTAG_UNICODESTR:
 685                         /* silently ignore */
 686                         /* who use unicode for hardware identification? */
 687                         break;
 688                 case _LTAG_VENDOR:
 689                         break;
 690                 case _LTAG_MEM32RANGE:
 691                         if (size != 17)
 692                                 goto __skip;
 693                         isapnp_parse_mem32_resource(dev, option_flags, size);
 694                         size = 0;
 695                         break;
 696                 case _LTAG_FIXEDMEM32RANGE:
 697                         if (size != 9)
 698                                 goto __skip;
 699                         isapnp_parse_fixed_mem32_resource(dev, option_flags,
 700                                                           size);
 701                         size = 0;
 702                         break;
 703                 case _STAG_END:
 704                         if (size > 0)
 705                                 isapnp_skip_bytes(size);
 706                         return 1;
 707                 default:
 708                         dev_err(&dev->dev, "unknown tag %#x (card %i), "
 709                                 "ignored\n", type, card->number);
 710                 }
 711 __skip:
 712                 if (size > 0)
 713                         isapnp_skip_bytes(size);
 714         }
 715         return 0;
 716 }
 717
 718 /*
 719  *  Parse resource map for ISA PnP card.
 720  */
 721 static void __init isapnp_parse_resource_map(struct pnp_card *card)
 722 {
 723         unsigned char type, tmp[17];
 724         unsigned short size;
 725
 726         while (1) {
 727                 if (isapnp_read_tag(&type, &size) < 0)
 728                         return;
 729                 switch (type) {
 730                 case _STAG_PNPVERNO:
 731                         if (size != 2)
 732                                 goto __skip;
 733                         isapnp_peek(tmp, 2);
 734                         card->pnpver = tmp[0];
 735                         card->productver = tmp[1];
 736                         size = 0;
 737                         break;
 738                 case _STAG_LOGDEVID:
 739                         if (size >= 5 && size <= 6) {
 740                                 if (isapnp_create_device(card, size) == 1)
 741                                         return;
 742                                 size = 0;
 743                         }
 744                         break;
 745                 case _STAG_VENDOR:
 746                         break;
 747                 case _LTAG_ANSISTR:
 748                         isapnp_parse_name(card->name, sizeof(card->name),
 749                                           &size);
 750                         break;
 751                 case _LTAG_UNICODESTR:
 752                         /* silently ignore */
 753                         /* who use unicode for hardware identification? */
 754                         break;
 755                 case _LTAG_VENDOR:
 756                         break;
 757                 case _STAG_END:
 758                         if (size > 0)
 759                                 isapnp_skip_bytes(size);
 760                         return;
 761                 default:
 762                         dev_err(&card->dev, "unknown tag %#x, ignored\n",
 763                                type);
 764                 }
 765 __skip:
 766                 if (size > 0)
 767                         isapnp_skip_bytes(size);
 768         }
 769 }
 770
 771 /*
 772  *  Compute ISA PnP checksum for first eight bytes.
 773  */
 774 static unsigned char __init isapnp_checksum(unsigned char *data)
 775 {
 776         int i, j;
 777         unsigned char checksum = 0x6a, bit, b;
 778
 779         for (i = 0; i < 8; i++) {
 780                 b = data[i];
 781                 for (j = 0; j < 8; j++) {
 782                         bit = 0;
 783                         if (b & (1 << j))
 784                                 bit = 1;
 785                         checksum =
 786                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 787                             | (checksum >> 1);
 788                 }
 789         }
 790         return checksum;
 791 }
 792
 793 /*
 794  *  Build device list for all present ISA PnP devices.
 795  */
 796 static int __init isapnp_build_device_list(void)
 797 {
 798         int csn;
 799         unsigned char header[9], checksum;
 800         struct pnp_card *card;
 801         u32 eisa_id;
 802         char id[8];
 803
 804         isapnp_wait();
 805         isapnp_key();
 806         for (csn = 1; csn <= isapnp_csn_count; csn++) {
 807                 isapnp_wake(csn);
 808                 isapnp_peek(header, 9);
 809                 checksum = isapnp_checksum(header);
 810                 eisa_id = header[0] | header[1] << 8 |
 811                           header[2] << 16 | header[3] << 24;
 812                 pnp_eisa_id_to_string(eisa_id, id);
 813                 card = pnp_alloc_card(&isapnp_protocol, csn, id);
 814                 if (!card)
 815                         continue;
 816
 817 #if 0
 818                 dev_info(&card->dev,
 819                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
 820                        header[0], header[1], header[2], header[3], header[4],
 821                        header[5], header[6], header[7], header[8]);
 822                 dev_info(&card->dev, "checksum = %#x\n", checksum);
 823 #endif
 824                 INIT_LIST_HEAD(&card->devices);
 825                 card->serial =
 826                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
 827                     header[4];
 828                 isapnp_checksum_value = 0x00;
 829                 isapnp_parse_resource_map(card);
 830                 if (isapnp_checksum_value != 0x00)
 831                         dev_err(&card->dev, "invalid checksum %#x\n",
 832                                 isapnp_checksum_value);
 833                 card->checksum = isapnp_checksum_value;
 834
 835                 pnp_add_card(card);
 836         }
 837         isapnp_wait();
 838         return 0;
 839 }
 840
 841 /*
 842  *  Basic configuration routines.
 843  */
 844
 845 int isapnp_present(void)
 846 {
 847         struct pnp_card *card;
 848
 849         pnp_for_each_card(card) {
 850                 if (card->protocol == &isapnp_protocol)
 851                         return 1;
 852         }
 853         return 0;
 854 }
 855
 856 int isapnp_cfg_begin(int csn, int logdev)
 857 {
 858         if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
 859                 return -EINVAL;
 860         mutex_lock(&isapnp_cfg_mutex);
 861         isapnp_wait();
 862         isapnp_key();
 863         isapnp_wake(csn);
 864 #if 0
 865         /* to avoid malfunction when the isapnptools package is used */
 866         /* we must set RDP to our value again */
 867         /* it is possible to set RDP only in the isolation phase */
 868         /*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
 869         isapnp_write_byte(0x02, 0x04);  /* clear CSN of card */
 870         mdelay(2);              /* is this necessary? */
 871         isapnp_wake(csn);       /* bring card into sleep state */
 872         isapnp_wake(0);         /* bring card into isolation state */
 873         isapnp_set_rdp();       /* reset the RDP port */
 874         udelay(1000);           /* delay 1000us */
 875         isapnp_write_byte(0x06, csn);   /* reset CSN to previous value */
 876         udelay(250);            /* is this necessary? */
 877 #endif
 878         if (logdev >= 0)
 879                 isapnp_device(logdev);
 880         return 0;
 881 }
 882
 883 int isapnp_cfg_end(void)
 884 {
 885         isapnp_wait();
 886         mutex_unlock(&isapnp_cfg_mutex);
 887         return 0;
 888 }
 889
 890 /*
 891  *  Initialization.
 892  */
 893
 894 EXPORT_SYMBOL(isapnp_protocol);
 895 EXPORT_SYMBOL(isapnp_present);
 896 EXPORT_SYMBOL(isapnp_cfg_begin);
 897 EXPORT_SYMBOL(isapnp_cfg_end);
 898 EXPORT_SYMBOL(isapnp_write_byte);
 899
 900 static int isapnp_get_resources(struct pnp_dev *dev)
 901 {
 902         int i, ret;
 903
 904         pnp_dbg(&dev->dev, "get resources\n");
 905         pnp_init_resources(dev);
 906         isapnp_cfg_begin(dev->card->number, dev->number);
 907         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
 908         if (!dev->active)
 909                 goto __end;
 910
 911         for (i = 0; i < ISAPNP_MAX_PORT; i++) {
 912                 ret = isapnp_read_word(ISAPNP_CFG_PORT + (i << 1));
 913                 pnp_add_io_resource(dev, ret, ret,
 914                                     ret == 0 ? IORESOURCE_DISABLED : 0);
 915         }
 916         for (i = 0; i < ISAPNP_MAX_MEM; i++) {
 917                 ret = isapnp_read_word(ISAPNP_CFG_MEM + (i << 3)) << 8;
 918                 pnp_add_mem_resource(dev, ret, ret,
 919                                      ret == 0 ? IORESOURCE_DISABLED : 0);
 920         }
 921         for (i = 0; i < ISAPNP_MAX_IRQ; i++) {
 922                 ret = isapnp_read_word(ISAPNP_CFG_IRQ + (i << 1)) >> 8;
 923                 pnp_add_irq_resource(dev, ret,
 924                                      ret == 0 ? IORESOURCE_DISABLED : 0);
 925         }
 926         for (i = 0; i < ISAPNP_MAX_DMA; i++) {
 927                 ret = isapnp_read_byte(ISAPNP_CFG_DMA + i);
 928                 pnp_add_dma_resource(dev, ret,
 929                                      ret == 4 ? IORESOURCE_DISABLED : 0);
 930         }
 931
 932 __end:
 933         isapnp_cfg_end();
 934         return 0;
 935 }
 936
 937 static int isapnp_set_resources(struct pnp_dev *dev)
 938 {
 939         struct resource *res;
 940         int tmp;
 941
 942         pnp_dbg(&dev->dev, "set resources\n");
 943         isapnp_cfg_begin(dev->card->number, dev->number);
 944         dev->active = 1;
 945         for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
 946                 res = pnp_get_resource(dev, IORESOURCE_IO, tmp);
 947                 if (pnp_resource_enabled(res)) {
 948                         pnp_dbg(&dev->dev, "  set io  %d to %#llx\n",
 949                                 tmp, (unsigned long long) res->start);
 950                         isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
 951                                           res->start);
 952                 }
 953         }
 954         for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
 955                 res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp);
 956                 if (pnp_resource_enabled(res)) {
 957                         int irq = res->start;
 958                         if (irq == 2)
 959                                 irq = 9;
 960                         pnp_dbg(&dev->dev, "  set irq %d to %d\n", tmp, irq);
 961                         isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
 962                 }
 963         }
 964         for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
 965                 res = pnp_get_resource(dev, IORESOURCE_DMA, tmp);
 966                 if (pnp_resource_enabled(res)) {
 967                         pnp_dbg(&dev->dev, "  set dma %d to %lld\n",
 968                                 tmp, (unsigned long long) res->start);
 969                         isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start);
 970                 }
 971         }
 972         for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
 973                 res = pnp_get_resource(dev, IORESOURCE_MEM, tmp);
 974                 if (pnp_resource_enabled(res)) {
 975                         pnp_dbg(&dev->dev, "  set mem %d to %#llx\n",
 976                                 tmp, (unsigned long long) res->start);
 977                         isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
 978                                           (res->start >> 8) & 0xffff);
 979                 }
 980         }
 981         /* FIXME: We aren't handling 32bit mems properly here */
 982         isapnp_activate(dev->number);
 983         isapnp_cfg_end();
 984         return 0;
 985 }
 986
 987 static int isapnp_disable_resources(struct pnp_dev *dev)
 988 {
 989         if (!dev->active)
 990                 return -EINVAL;
 991         isapnp_cfg_begin(dev->card->number, dev->number);
 992         isapnp_deactivate(dev->number);
 993         dev->active = 0;
 994         isapnp_cfg_end();
 995         return 0;
 996 }
 997
 998 struct pnp_protocol isapnp_protocol = {
 999         .name = "ISA Plug and Play",
1000         .get = isapnp_get_resources,
1001         .set = isapnp_set_resources,
1002         .disable = isapnp_disable_resources,
1003 };
1004
1005 static int __init isapnp_init(void)
1006 {
1007         int cards;
1008         struct pnp_card *card;
1009         struct pnp_dev *dev;
1010
1011         if (isapnp_disable) {
1012                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1013                 return 0;
1014         }
1015 #ifdef CONFIG_PPC
1016         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1017                 return -EINVAL;
1018 #endif
1019 #ifdef ISAPNP_REGION_OK
1020         if (!request_region(_PIDXR, 1, "isapnp index")) {
1021                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1022                        _PIDXR);
1023                 return -EBUSY;
1024         }
1025 #endif
1026         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1027                 printk(KERN_ERR
1028                        "isapnp: Write Data Register 0x%x already used\n",
1029                        _PNPWRP);
1030 #ifdef ISAPNP_REGION_OK
1031                 release_region(_PIDXR, 1);
1032 #endif
1033                 return -EBUSY;
1034         }
1035
1036         if (pnp_register_protocol(&isapnp_protocol) < 0)
1037                 return -EBUSY;
1038
1039         /*
1040          *      Print a message. The existing ISAPnP code is hanging machines
1041          *      so let the user know where.
1042          */
1043
1044         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1045         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1046                 isapnp_rdp |= 3;
1047                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1048                         printk(KERN_ERR
1049                                "isapnp: Read Data Register 0x%x already used\n",
1050                                isapnp_rdp);
1051 #ifdef ISAPNP_REGION_OK
1052                         release_region(_PIDXR, 1);
1053 #endif
1054                         release_region(_PNPWRP, 1);
1055                         return -EBUSY;
1056                 }
1057                 isapnp_set_rdp();
1058         }
1059         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1060                 cards = isapnp_isolate();
1061                 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1062 #ifdef ISAPNP_REGION_OK
1063                         release_region(_PIDXR, 1);
1064 #endif
1065                         release_region(_PNPWRP, 1);
1066                         printk(KERN_INFO
1067                                "isapnp: No Plug & Play device found\n");
1068                         return 0;
1069                 }
1070                 request_region(isapnp_rdp, 1, "isapnp read");
1071         }
1072         isapnp_build_device_list();
1073         cards = 0;
1074
1075         protocol_for_each_card(&isapnp_protocol, card) {
1076                 cards++;
1077                 if (isapnp_verbose) {
1078                         dev_info(&card->dev, "card '%s'\n",
1079                                card->name[0] ? card->name : "unknown");
1080                         if (isapnp_verbose < 2)
1081                                 continue;
1082                         card_for_each_dev(card, dev) {
1083                                 dev_info(&card->dev, "device '%s'\n",
1084                                        dev->name[0] ? dev->name : "unknown");
1085                         }
1086                 }
1087         }
1088         if (cards)
1089                 printk(KERN_INFO
1090                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1091                        cards > 1 ? "s" : "");
1092         else
1093                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1094
1095         isapnp_proc_init();
1096         return 0;
1097 }
1098
1099 device_initcall(isapnp_init);
1100
1101 /* format is: noisapnp */
1102
1103 static int __init isapnp_setup_disable(char *str)
1104 {
1105         isapnp_disable = 1;
1106         return 1;
1107 }
1108
1109 __setup("noisapnp", isapnp_setup_disable);
1110
1111 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1112
1113 static int __init isapnp_setup_isapnp(char *str)
1114 {
1115         (void)((get_option(&str, &isapnp_rdp) == 2) &&
1116                (get_option(&str, &isapnp_reset) == 2) &&
1117                (get_option(&str, &isapnp_verbose) == 2));
1118         return 1;
1119 }
1120
1121 __setup("isapnp=", isapnp_setup_isapnp);