git.oblomov.eu Git - linux-2.6/blob - drivers/pnp/isapnp/core.c

   1 /*
   2  *  ISA Plug & Play support
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  *  Changelog:
  21  *  2000-01-01  Added quirks handling for buggy hardware
  22  *              Peter Denison <peterd@pnd-pc.demon.co.uk>
  23  *  2000-06-14  Added isapnp_probe_devs() and isapnp_activate_dev()
  24  *              Christoph Hellwig <hch@infradead.org>
  25  *  2001-06-03  Added release_region calls to correspond with
  26  *              request_region calls when a failure occurs.  Also
  27  *              added KERN_* constants to printk() calls.
  28  *  2001-11-07  Added isapnp_{,un}register_driver calls along the lines
  29  *              of the pci driver interface
  30  *              Kai Germaschewski <kai.germaschewski@gmx.de>
  31  *  2002-06-06  Made the use of dma channel 0 configurable
  32  *              Gerald Teschl <gerald.teschl@univie.ac.at>
  33  *  2002-10-06  Ported to PnP Layer - Adam Belay <ambx1@neo.rr.com>
  34  *  2003-08-11  Resource Management Updates - Adam Belay <ambx1@neo.rr.com>
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  40 #include <linux/slab.h>
  41 #include <linux/delay.h>
  42 #include <linux/init.h>
  43 #include <linux/isapnp.h>
  44 #include <linux/mutex.h>
  45 #include <asm/io.h>
  46
  47 #if 0
  48 #define ISAPNP_REGION_OK
  49 #endif
  50
  51 int isapnp_disable;             /* Disable ISA PnP */
  52 static int isapnp_rdp;          /* Read Data Port */
  53 static int isapnp_reset = 1;    /* reset all PnP cards (deactivate) */
  54 static int isapnp_verbose = 1;  /* verbose mode */
  55
  56 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  57 MODULE_DESCRIPTION("Generic ISA Plug & Play support");
  58 module_param(isapnp_disable, int, 0);
  59 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable");
  60 module_param(isapnp_rdp, int, 0);
  61 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
  62 module_param(isapnp_reset, int, 0);
  63 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
  64 module_param(isapnp_verbose, int, 0);
  65 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
  66 MODULE_LICENSE("GPL");
  67
  68 #define _PIDXR          0x279
  69 #define _PNPWRP         0xa79
  70
  71 /* short tags */
  72 #define _STAG_PNPVERNO          0x01
  73 #define _STAG_LOGDEVID          0x02
  74 #define _STAG_COMPATDEVID       0x03
  75 #define _STAG_IRQ               0x04
  76 #define _STAG_DMA               0x05
  77 #define _STAG_STARTDEP          0x06
  78 #define _STAG_ENDDEP            0x07
  79 #define _STAG_IOPORT            0x08
  80 #define _STAG_FIXEDIO           0x09
  81 #define _STAG_VENDOR            0x0e
  82 #define _STAG_END               0x0f
  83 /* long tags */
  84 #define _LTAG_MEMRANGE          0x81
  85 #define _LTAG_ANSISTR           0x82
  86 #define _LTAG_UNICODESTR        0x83
  87 #define _LTAG_VENDOR            0x84
  88 #define _LTAG_MEM32RANGE        0x85
  89 #define _LTAG_FIXEDMEM32RANGE   0x86
  90
  91 static unsigned char isapnp_checksum_value;
  92 static DEFINE_MUTEX(isapnp_cfg_mutex);
  93 static int isapnp_csn_count;
  94
  95 /* some prototypes */
  96
  97 static inline void write_data(unsigned char x)
  98 {
  99         outb(x, _PNPWRP);
 100 }
 101
 102 static inline void write_address(unsigned char x)
 103 {
 104         outb(x, _PIDXR);
 105         udelay(20);
 106 }
 107
 108 static inline unsigned char read_data(void)
 109 {
 110         unsigned char val = inb(isapnp_rdp);
 111         return val;
 112 }
 113
 114 unsigned char isapnp_read_byte(unsigned char idx)
 115 {
 116         write_address(idx);
 117         return read_data();
 118 }
 119
 120 static unsigned short isapnp_read_word(unsigned char idx)
 121 {
 122         unsigned short val;
 123
 124         val = isapnp_read_byte(idx);
 125         val = (val << 8) + isapnp_read_byte(idx + 1);
 126         return val;
 127 }
 128
 129 void isapnp_write_byte(unsigned char idx, unsigned char val)
 130 {
 131         write_address(idx);
 132         write_data(val);
 133 }
 134
 135 static void isapnp_write_word(unsigned char idx, unsigned short val)
 136 {
 137         isapnp_write_byte(idx, val >> 8);
 138         isapnp_write_byte(idx + 1, val);
 139 }
 140
 141 static void isapnp_key(void)
 142 {
 143         unsigned char code = 0x6a, msb;
 144         int i;
 145
 146         mdelay(1);
 147         write_address(0x00);
 148         write_address(0x00);
 149
 150         write_address(code);
 151
 152         for (i = 1; i < 32; i++) {
 153                 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
 154                 code = (code >> 1) | msb;
 155                 write_address(code);
 156         }
 157 }
 158
 159 /* place all pnp cards in wait-for-key state */
 160 static void isapnp_wait(void)
 161 {
 162         isapnp_write_byte(0x02, 0x02);
 163 }
 164
 165 static void isapnp_wake(unsigned char csn)
 166 {
 167         isapnp_write_byte(0x03, csn);
 168 }
 169
 170 static void isapnp_device(unsigned char logdev)
 171 {
 172         isapnp_write_byte(0x07, logdev);
 173 }
 174
 175 static void isapnp_activate(unsigned char logdev)
 176 {
 177         isapnp_device(logdev);
 178         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
 179         udelay(250);
 180 }
 181
 182 static void isapnp_deactivate(unsigned char logdev)
 183 {
 184         isapnp_device(logdev);
 185         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
 186         udelay(500);
 187 }
 188
 189 static void __init isapnp_peek(unsigned char *data, int bytes)
 190 {
 191         int i, j;
 192         unsigned char d = 0;
 193
 194         for (i = 1; i <= bytes; i++) {
 195                 for (j = 0; j < 20; j++) {
 196                         d = isapnp_read_byte(0x05);
 197                         if (d & 1)
 198                                 break;
 199                         udelay(100);
 200                 }
 201                 if (!(d & 1)) {
 202                         if (data != NULL)
 203                                 *data++ = 0xff;
 204                         continue;
 205                 }
 206                 d = isapnp_read_byte(0x04);     /* PRESDI */
 207                 isapnp_checksum_value += d;
 208                 if (data != NULL)
 209                         *data++ = d;
 210         }
 211 }
 212
 213 #define RDP_STEP        32      /* minimum is 4 */
 214
 215 static int isapnp_next_rdp(void)
 216 {
 217         int rdp = isapnp_rdp;
 218         static int old_rdp = 0;
 219
 220         if (old_rdp) {
 221                 release_region(old_rdp, 1);
 222                 old_rdp = 0;
 223         }
 224         while (rdp <= 0x3ff) {
 225                 /*
 226                  *      We cannot use NE2000 probe spaces for ISAPnP or we
 227                  *      will lock up machines.
 228                  */
 229                 if ((rdp < 0x280 || rdp > 0x380)
 230                     && request_region(rdp, 1, "ISAPnP")) {
 231                         isapnp_rdp = rdp;
 232                         old_rdp = rdp;
 233                         return 0;
 234                 }
 235                 rdp += RDP_STEP;
 236         }
 237         return -1;
 238 }
 239
 240 /* Set read port address */
 241 static inline void isapnp_set_rdp(void)
 242 {
 243         isapnp_write_byte(0x00, isapnp_rdp >> 2);
 244         udelay(100);
 245 }
 246
 247 /*
 248  *      Perform an isolation. The port selection code now tries to avoid
 249  *      "dangerous to read" ports.
 250  */
 251 static int __init isapnp_isolate_rdp_select(void)
 252 {
 253         isapnp_wait();
 254         isapnp_key();
 255
 256         /* Control: reset CSN and conditionally everything else too */
 257         isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
 258         mdelay(2);
 259
 260         isapnp_wait();
 261         isapnp_key();
 262         isapnp_wake(0x00);
 263
 264         if (isapnp_next_rdp() < 0) {
 265                 isapnp_wait();
 266                 return -1;
 267         }
 268
 269         isapnp_set_rdp();
 270         udelay(1000);
 271         write_address(0x01);
 272         udelay(1000);
 273         return 0;
 274 }
 275
 276 /*
 277  *  Isolate (assign uniqued CSN) to all ISA PnP devices.
 278  */
 279 static int __init isapnp_isolate(void)
 280 {
 281         unsigned char checksum = 0x6a;
 282         unsigned char chksum = 0x00;
 283         unsigned char bit = 0x00;
 284         int data;
 285         int csn = 0;
 286         int i;
 287         int iteration = 1;
 288
 289         isapnp_rdp = 0x213;
 290         if (isapnp_isolate_rdp_select() < 0)
 291                 return -1;
 292
 293         while (1) {
 294                 for (i = 1; i <= 64; i++) {
 295                         data = read_data() << 8;
 296                         udelay(250);
 297                         data = data | read_data();
 298                         udelay(250);
 299                         if (data == 0x55aa)
 300                                 bit = 0x01;
 301                         checksum =
 302                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 303                             | (checksum >> 1);
 304                         bit = 0x00;
 305                 }
 306                 for (i = 65; i <= 72; i++) {
 307                         data = read_data() << 8;
 308                         udelay(250);
 309                         data = data | read_data();
 310                         udelay(250);
 311                         if (data == 0x55aa)
 312                                 chksum |= (1 << (i - 65));
 313                 }
 314                 if (checksum != 0x00 && checksum == chksum) {
 315                         csn++;
 316
 317                         isapnp_write_byte(0x06, csn);
 318                         udelay(250);
 319                         iteration++;
 320                         isapnp_wake(0x00);
 321                         isapnp_set_rdp();
 322                         udelay(1000);
 323                         write_address(0x01);
 324                         udelay(1000);
 325                         goto __next;
 326                 }
 327                 if (iteration == 1) {
 328                         isapnp_rdp += RDP_STEP;
 329                         if (isapnp_isolate_rdp_select() < 0)
 330                                 return -1;
 331                 } else if (iteration > 1) {
 332                         break;
 333                 }
 334 __next:
 335                 if (csn == 255)
 336                         break;
 337                 checksum = 0x6a;
 338                 chksum = 0x00;
 339                 bit = 0x00;
 340         }
 341         isapnp_wait();
 342         isapnp_csn_count = csn;
 343         return csn;
 344 }
 345
 346 /*
 347  *  Read one tag from stream.
 348  */
 349 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
 350 {
 351         unsigned char tag, tmp[2];
 352
 353         isapnp_peek(&tag, 1);
 354         if (tag == 0)           /* invalid tag */
 355                 return -1;
 356         if (tag & 0x80) {       /* large item */
 357                 *type = tag;
 358                 isapnp_peek(tmp, 2);
 359                 *size = (tmp[1] << 8) | tmp[0];
 360         } else {
 361                 *type = (tag >> 3) & 0x0f;
 362                 *size = tag & 0x07;
 363         }
 364 #if 0
 365         printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type,
 366                *size);
 367 #endif
 368         if (*type == 0xff && *size == 0xffff)   /* probably invalid data */
 369                 return -1;
 370         return 0;
 371 }
 372
 373 /*
 374  *  Skip specified number of bytes from stream.
 375  */
 376 static void __init isapnp_skip_bytes(int count)
 377 {
 378         isapnp_peek(NULL, count);
 379 }
 380
 381 /*
 382  *  Parse EISA id.
 383  */
 384 static void isapnp_parse_id(struct pnp_dev *dev, unsigned short vendor,
 385                             unsigned short device)
 386 {
 387         struct pnp_id *id;
 388
 389         if (!dev)
 390                 return;
 391         id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 392         if (!id)
 393                 return;
 394         sprintf(id->id, "%c%c%c%x%x%x%x",
 395                 'A' + ((vendor >> 2) & 0x3f) - 1,
 396                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
 397                 'A' + ((vendor >> 8) & 0x1f) - 1,
 398                 (device >> 4) & 0x0f,
 399                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
 400         pnp_add_id(id, dev);
 401 }
 402
 403 /*
 404  *  Parse logical device tag.
 405  */
 406 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
 407                                                   int size, int number)
 408 {
 409         unsigned char tmp[6];
 410         struct pnp_dev *dev;
 411
 412         isapnp_peek(tmp, size);
 413         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 414         if (!dev)
 415                 return NULL;
 416         dev->number = number;
 417         isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0], (tmp[3] << 8) | tmp[2]);
 418         dev->regs = tmp[4];
 419         dev->card = card;
 420         if (size > 5)
 421                 dev->regs |= tmp[5] << 8;
 422         dev->protocol = &isapnp_protocol;
 423         dev->capabilities |= PNP_CONFIGURABLE;
 424         dev->capabilities |= PNP_READ;
 425         dev->capabilities |= PNP_WRITE;
 426         dev->capabilities |= PNP_DISABLE;
 427         pnp_init_resource_table(&dev->res);
 428         return dev;
 429 }
 430
 431 /*
 432  *  Add IRQ resource to resources list.
 433  */
 434 static void __init isapnp_parse_irq_resource(struct pnp_option *option,
 435                                              int size)
 436 {
 437         unsigned char tmp[3];
 438         struct pnp_irq *irq;
 439         unsigned long bits;
 440
 441         isapnp_peek(tmp, size);
 442         irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
 443         if (!irq)
 444                 return;
 445         bits = (tmp[1] << 8) | tmp[0];
 446         bitmap_copy(irq->map, &bits, 16);
 447         if (size > 2)
 448                 irq->flags = tmp[2];
 449         else
 450                 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
 451         pnp_register_irq_resource(option, irq);
 452 }
 453
 454 /*
 455  *  Add DMA resource to resources list.
 456  */
 457 static void __init isapnp_parse_dma_resource(struct pnp_option *option,
 458                                              int size)
 459 {
 460         unsigned char tmp[2];
 461         struct pnp_dma *dma;
 462
 463         isapnp_peek(tmp, size);
 464         dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
 465         if (!dma)
 466                 return;
 467         dma->map = tmp[0];
 468         dma->flags = tmp[1];
 469         pnp_register_dma_resource(option, dma);
 470 }
 471
 472 /*
 473  *  Add port resource to resources list.
 474  */
 475 static void __init isapnp_parse_port_resource(struct pnp_option *option,
 476                                               int size)
 477 {
 478         unsigned char tmp[7];
 479         struct pnp_port *port;
 480
 481         isapnp_peek(tmp, size);
 482         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 483         if (!port)
 484                 return;
 485         port->min = (tmp[2] << 8) | tmp[1];
 486         port->max = (tmp[4] << 8) | tmp[3];
 487         port->align = tmp[5];
 488         port->size = tmp[6];
 489         port->flags = tmp[0] ? PNP_PORT_FLAG_16BITADDR : 0;
 490         pnp_register_port_resource(option, port);
 491 }
 492
 493 /*
 494  *  Add fixed port resource to resources list.
 495  */
 496 static void __init isapnp_parse_fixed_port_resource(struct pnp_option *option,
 497                                                     int size)
 498 {
 499         unsigned char tmp[3];
 500         struct pnp_port *port;
 501
 502         isapnp_peek(tmp, size);
 503         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 504         if (!port)
 505                 return;
 506         port->min = port->max = (tmp[1] << 8) | tmp[0];
 507         port->size = tmp[2];
 508         port->align = 0;
 509         port->flags = PNP_PORT_FLAG_FIXED;
 510         pnp_register_port_resource(option, port);
 511 }
 512
 513 /*
 514  *  Add memory resource to resources list.
 515  */
 516 static void __init isapnp_parse_mem_resource(struct pnp_option *option,
 517                                              int size)
 518 {
 519         unsigned char tmp[9];
 520         struct pnp_mem *mem;
 521
 522         isapnp_peek(tmp, size);
 523         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 524         if (!mem)
 525                 return;
 526         mem->min = ((tmp[2] << 8) | tmp[1]) << 8;
 527         mem->max = ((tmp[4] << 8) | tmp[3]) << 8;
 528         mem->align = (tmp[6] << 8) | tmp[5];
 529         mem->size = ((tmp[8] << 8) | tmp[7]) << 8;
 530         mem->flags = tmp[0];
 531         pnp_register_mem_resource(option, mem);
 532 }
 533
 534 /*
 535  *  Add 32-bit memory resource to resources list.
 536  */
 537 static void __init isapnp_parse_mem32_resource(struct pnp_option *option,
 538                                                int size)
 539 {
 540         unsigned char tmp[17];
 541         struct pnp_mem *mem;
 542
 543         isapnp_peek(tmp, size);
 544         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 545         if (!mem)
 546                 return;
 547         mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 548         mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 549         mem->align =
 550             (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
 551         mem->size =
 552             (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
 553         mem->flags = tmp[0];
 554         pnp_register_mem_resource(option, mem);
 555 }
 556
 557 /*
 558  *  Add 32-bit fixed memory resource to resources list.
 559  */
 560 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_option *option,
 561                                                      int size)
 562 {
 563         unsigned char tmp[9];
 564         struct pnp_mem *mem;
 565
 566         isapnp_peek(tmp, size);
 567         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 568         if (!mem)
 569                 return;
 570         mem->min = mem->max =
 571             (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 572         mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 573         mem->align = 0;
 574         mem->flags = tmp[0];
 575         pnp_register_mem_resource(option, mem);
 576 }
 577
 578 /*
 579  *  Parse card name for ISA PnP device.
 580  */
 581 static void __init
 582 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
 583 {
 584         if (name[0] == '\0') {
 585                 unsigned short size1 =
 586                     *size >= name_max ? (name_max - 1) : *size;
 587                 isapnp_peek(name, size1);
 588                 name[size1] = '\0';
 589                 *size -= size1;
 590
 591                 /* clean whitespace from end of string */
 592                 while (size1 > 0 && name[--size1] == ' ')
 593                         name[size1] = '\0';
 594         }
 595 }
 596
 597 /*
 598  *  Parse resource map for logical device.
 599  */
 600 static int __init isapnp_create_device(struct pnp_card *card,
 601                                        unsigned short size)
 602 {
 603         int number = 0, skip = 0, priority = 0, compat = 0;
 604         unsigned char type, tmp[17];
 605         struct pnp_option *option;
 606         struct pnp_dev *dev;
 607
 608         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
 609                 return 1;
 610         option = pnp_register_independent_option(dev);
 611         if (!option) {
 612                 kfree(dev);
 613                 return 1;
 614         }
 615         pnp_add_card_device(card, dev);
 616
 617         while (1) {
 618                 if (isapnp_read_tag(&type, &size) < 0)
 619                         return 1;
 620                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
 621                         goto __skip;
 622                 switch (type) {
 623                 case _STAG_LOGDEVID:
 624                         if (size >= 5 && size <= 6) {
 625                                 if ((dev =
 626                                      isapnp_parse_device(card, size,
 627                                                          number++)) == NULL)
 628                                         return 1;
 629                                 size = 0;
 630                                 skip = 0;
 631                                 option = pnp_register_independent_option(dev);
 632                                 if (!option) {
 633                                         kfree(dev);
 634                                         return 1;
 635                                 }
 636                                 pnp_add_card_device(card, dev);
 637                         } else {
 638                                 skip = 1;
 639                         }
 640                         priority = 0;
 641                         compat = 0;
 642                         break;
 643                 case _STAG_COMPATDEVID:
 644                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
 645                                 isapnp_peek(tmp, 4);
 646                                 isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0],
 647                                                 (tmp[3] << 8) | tmp[2]);
 648                                 compat++;
 649                                 size = 0;
 650                         }
 651                         break;
 652                 case _STAG_IRQ:
 653                         if (size < 2 || size > 3)
 654                                 goto __skip;
 655                         isapnp_parse_irq_resource(option, size);
 656                         size = 0;
 657                         break;
 658                 case _STAG_DMA:
 659                         if (size != 2)
 660                                 goto __skip;
 661                         isapnp_parse_dma_resource(option, size);
 662                         size = 0;
 663                         break;
 664                 case _STAG_STARTDEP:
 665                         if (size > 1)
 666                                 goto __skip;
 667                         priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
 668                         if (size > 0) {
 669                                 isapnp_peek(tmp, size);
 670                                 priority = 0x100 | tmp[0];
 671                                 size = 0;
 672                         }
 673                         option = pnp_register_dependent_option(dev, priority);
 674                         if (!option)
 675                                 return 1;
 676                         break;
 677                 case _STAG_ENDDEP:
 678                         if (size != 0)
 679                                 goto __skip;
 680                         priority = 0;
 681                         break;
 682                 case _STAG_IOPORT:
 683                         if (size != 7)
 684                                 goto __skip;
 685                         isapnp_parse_port_resource(option, size);
 686                         size = 0;
 687                         break;
 688                 case _STAG_FIXEDIO:
 689                         if (size != 3)
 690                                 goto __skip;
 691                         isapnp_parse_fixed_port_resource(option, size);
 692                         size = 0;
 693                         break;
 694                 case _STAG_VENDOR:
 695                         break;
 696                 case _LTAG_MEMRANGE:
 697                         if (size != 9)
 698                                 goto __skip;
 699                         isapnp_parse_mem_resource(option, size);
 700                         size = 0;
 701                         break;
 702                 case _LTAG_ANSISTR:
 703                         isapnp_parse_name(dev->name, sizeof(dev->name), &size);
 704                         break;
 705                 case _LTAG_UNICODESTR:
 706                         /* silently ignore */
 707                         /* who use unicode for hardware identification? */
 708                         break;
 709                 case _LTAG_VENDOR:
 710                         break;
 711                 case _LTAG_MEM32RANGE:
 712                         if (size != 17)
 713                                 goto __skip;
 714                         isapnp_parse_mem32_resource(option, size);
 715                         size = 0;
 716                         break;
 717                 case _LTAG_FIXEDMEM32RANGE:
 718                         if (size != 9)
 719                                 goto __skip;
 720                         isapnp_parse_fixed_mem32_resource(option, size);
 721                         size = 0;
 722                         break;
 723                 case _STAG_END:
 724                         if (size > 0)
 725                                 isapnp_skip_bytes(size);
 726                         return 1;
 727                 default:
 728                         printk(KERN_ERR
 729                                "isapnp: unexpected or unknown tag type 0x%x for logical device %i (device %i), ignored\n",
 730                                type, dev->number, card->number);
 731                 }
 732 __skip:
 733                 if (size > 0)
 734                         isapnp_skip_bytes(size);
 735         }
 736         return 0;
 737 }
 738
 739 /*
 740  *  Parse resource map for ISA PnP card.
 741  */
 742 static void __init isapnp_parse_resource_map(struct pnp_card *card)
 743 {
 744         unsigned char type, tmp[17];
 745         unsigned short size;
 746
 747         while (1) {
 748                 if (isapnp_read_tag(&type, &size) < 0)
 749                         return;
 750                 switch (type) {
 751                 case _STAG_PNPVERNO:
 752                         if (size != 2)
 753                                 goto __skip;
 754                         isapnp_peek(tmp, 2);
 755                         card->pnpver = tmp[0];
 756                         card->productver = tmp[1];
 757                         size = 0;
 758                         break;
 759                 case _STAG_LOGDEVID:
 760                         if (size >= 5 && size <= 6) {
 761                                 if (isapnp_create_device(card, size) == 1)
 762                                         return;
 763                                 size = 0;
 764                         }
 765                         break;
 766                 case _STAG_VENDOR:
 767                         break;
 768                 case _LTAG_ANSISTR:
 769                         isapnp_parse_name(card->name, sizeof(card->name),
 770                                           &size);
 771                         break;
 772                 case _LTAG_UNICODESTR:
 773                         /* silently ignore */
 774                         /* who use unicode for hardware identification? */
 775                         break;
 776                 case _LTAG_VENDOR:
 777                         break;
 778                 case _STAG_END:
 779                         if (size > 0)
 780                                 isapnp_skip_bytes(size);
 781                         return;
 782                 default:
 783                         printk(KERN_ERR
 784                                "isapnp: unexpected or unknown tag type 0x%x for device %i, ignored\n",
 785                                type, card->number);
 786                 }
 787 __skip:
 788                 if (size > 0)
 789                         isapnp_skip_bytes(size);
 790         }
 791 }
 792
 793 /*
 794  *  Compute ISA PnP checksum for first eight bytes.
 795  */
 796 static unsigned char __init isapnp_checksum(unsigned char *data)
 797 {
 798         int i, j;
 799         unsigned char checksum = 0x6a, bit, b;
 800
 801         for (i = 0; i < 8; i++) {
 802                 b = data[i];
 803                 for (j = 0; j < 8; j++) {
 804                         bit = 0;
 805                         if (b & (1 << j))
 806                                 bit = 1;
 807                         checksum =
 808                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 809                             | (checksum >> 1);
 810                 }
 811         }
 812         return checksum;
 813 }
 814
 815 /*
 816  *  Parse EISA id for ISA PnP card.
 817  */
 818 static void isapnp_parse_card_id(struct pnp_card *card, unsigned short vendor,
 819                                  unsigned short device)
 820 {
 821         struct pnp_id *id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 822
 823         if (!id)
 824                 return;
 825         sprintf(id->id, "%c%c%c%x%x%x%x",
 826                 'A' + ((vendor >> 2) & 0x3f) - 1,
 827                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
 828                 'A' + ((vendor >> 8) & 0x1f) - 1,
 829                 (device >> 4) & 0x0f,
 830                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
 831         pnp_add_card_id(id, card);
 832 }
 833
 834 /*
 835  *  Build device list for all present ISA PnP devices.
 836  */
 837 static int __init isapnp_build_device_list(void)
 838 {
 839         int csn;
 840         unsigned char header[9], checksum;
 841         struct pnp_card *card;
 842
 843         isapnp_wait();
 844         isapnp_key();
 845         for (csn = 1; csn <= isapnp_csn_count; csn++) {
 846                 isapnp_wake(csn);
 847                 isapnp_peek(header, 9);
 848                 checksum = isapnp_checksum(header);
 849 #if 0
 850                 printk(KERN_DEBUG
 851                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
 852                        header[0], header[1], header[2], header[3], header[4],
 853                        header[5], header[6], header[7], header[8]);
 854                 printk(KERN_DEBUG "checksum = 0x%x\n", checksum);
 855 #endif
 856                 if ((card =
 857                      kzalloc(sizeof(struct pnp_card), GFP_KERNEL)) == NULL)
 858                         continue;
 859
 860                 card->number = csn;
 861                 INIT_LIST_HEAD(&card->devices);
 862                 isapnp_parse_card_id(card, (header[1] << 8) | header[0],
 863                                      (header[3] << 8) | header[2]);
 864                 card->serial =
 865                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
 866                     header[4];
 867                 isapnp_checksum_value = 0x00;
 868                 isapnp_parse_resource_map(card);
 869                 if (isapnp_checksum_value != 0x00)
 870                         printk(KERN_ERR
 871                                "isapnp: checksum for device %i is not valid (0x%x)\n",
 872                                csn, isapnp_checksum_value);
 873                 card->checksum = isapnp_checksum_value;
 874                 card->protocol = &isapnp_protocol;
 875
 876                 pnp_add_card(card);
 877         }
 878         isapnp_wait();
 879         return 0;
 880 }
 881
 882 /*
 883  *  Basic configuration routines.
 884  */
 885
 886 int isapnp_present(void)
 887 {
 888         struct pnp_card *card;
 889
 890         pnp_for_each_card(card) {
 891                 if (card->protocol == &isapnp_protocol)
 892                         return 1;
 893         }
 894         return 0;
 895 }
 896
 897 int isapnp_cfg_begin(int csn, int logdev)
 898 {
 899         if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
 900                 return -EINVAL;
 901         mutex_lock(&isapnp_cfg_mutex);
 902         isapnp_wait();
 903         isapnp_key();
 904         isapnp_wake(csn);
 905 #if 0
 906         /* to avoid malfunction when the isapnptools package is used */
 907         /* we must set RDP to our value again */
 908         /* it is possible to set RDP only in the isolation phase */
 909         /*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
 910         isapnp_write_byte(0x02, 0x04);  /* clear CSN of card */
 911         mdelay(2);              /* is this necessary? */
 912         isapnp_wake(csn);       /* bring card into sleep state */
 913         isapnp_wake(0);         /* bring card into isolation state */
 914         isapnp_set_rdp();       /* reset the RDP port */
 915         udelay(1000);           /* delay 1000us */
 916         isapnp_write_byte(0x06, csn);   /* reset CSN to previous value */
 917         udelay(250);            /* is this necessary? */
 918 #endif
 919         if (logdev >= 0)
 920                 isapnp_device(logdev);
 921         return 0;
 922 }
 923
 924 int isapnp_cfg_end(void)
 925 {
 926         isapnp_wait();
 927         mutex_unlock(&isapnp_cfg_mutex);
 928         return 0;
 929 }
 930
 931 /*
 932  *  Initialization.
 933  */
 934
 935 EXPORT_SYMBOL(isapnp_protocol);
 936 EXPORT_SYMBOL(isapnp_present);
 937 EXPORT_SYMBOL(isapnp_cfg_begin);
 938 EXPORT_SYMBOL(isapnp_cfg_end);
 939 EXPORT_SYMBOL(isapnp_write_byte);
 940
 941 static int isapnp_read_resources(struct pnp_dev *dev,
 942                                  struct pnp_resource_table *res)
 943 {
 944         int tmp, ret;
 945
 946         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
 947         if (dev->active) {
 948                 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
 949                         ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
 950                         if (!ret)
 951                                 continue;
 952                         res->port_resource[tmp].start = ret;
 953                         res->port_resource[tmp].flags = IORESOURCE_IO;
 954                 }
 955                 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
 956                         ret =
 957                             isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
 958                         if (!ret)
 959                                 continue;
 960                         res->mem_resource[tmp].start = ret;
 961                         res->mem_resource[tmp].flags = IORESOURCE_MEM;
 962                 }
 963                 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
 964                         ret =
 965                             (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >>
 966                              8);
 967                         if (!ret)
 968                                 continue;
 969                         res->irq_resource[tmp].start =
 970                             res->irq_resource[tmp].end = ret;
 971                         res->irq_resource[tmp].flags = IORESOURCE_IRQ;
 972                 }
 973                 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
 974                         ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
 975                         if (ret == 4)
 976                                 continue;
 977                         res->dma_resource[tmp].start =
 978                             res->dma_resource[tmp].end = ret;
 979                         res->dma_resource[tmp].flags = IORESOURCE_DMA;
 980                 }
 981         }
 982         return 0;
 983 }
 984
 985 static int isapnp_get_resources(struct pnp_dev *dev,
 986                                 struct pnp_resource_table *res)
 987 {
 988         int ret;
 989
 990         pnp_init_resource_table(res);
 991         isapnp_cfg_begin(dev->card->number, dev->number);
 992         ret = isapnp_read_resources(dev, res);
 993         isapnp_cfg_end();
 994         return ret;
 995 }
 996
 997 static int isapnp_set_resources(struct pnp_dev *dev,
 998                                 struct pnp_resource_table *res)
 999 {
1000         int tmp;
1001
1002         isapnp_cfg_begin(dev->card->number, dev->number);
1003         dev->active = 1;
1004         for (tmp = 0;
1005              tmp < PNP_MAX_PORT
1006              && (res->port_resource[tmp].
1007                  flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO;
1008              tmp++)
1009                 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
1010                                   res->port_resource[tmp].start);
1011         for (tmp = 0;
1012              tmp < PNP_MAX_IRQ
1013              && (res->irq_resource[tmp].
1014                  flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ;
1015              tmp++) {
1016                 int irq = res->irq_resource[tmp].start;
1017                 if (irq == 2)
1018                         irq = 9;
1019                 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
1020         }
1021         for (tmp = 0;
1022              tmp < PNP_MAX_DMA
1023              && (res->dma_resource[tmp].
1024                  flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA;
1025              tmp++)
1026                 isapnp_write_byte(ISAPNP_CFG_DMA + tmp,
1027                                   res->dma_resource[tmp].start);
1028         for (tmp = 0;
1029              tmp < PNP_MAX_MEM
1030              && (res->mem_resource[tmp].
1031                  flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM;
1032              tmp++)
1033                 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
1034                                   (res->mem_resource[tmp].start >> 8) & 0xffff);
1035         /* FIXME: We aren't handling 32bit mems properly here */
1036         isapnp_activate(dev->number);
1037         isapnp_cfg_end();
1038         return 0;
1039 }
1040
1041 static int isapnp_disable_resources(struct pnp_dev *dev)
1042 {
1043         if (!dev->active)
1044                 return -EINVAL;
1045         isapnp_cfg_begin(dev->card->number, dev->number);
1046         isapnp_deactivate(dev->number);
1047         dev->active = 0;
1048         isapnp_cfg_end();
1049         return 0;
1050 }
1051
1052 struct pnp_protocol isapnp_protocol = {
1053         .name = "ISA Plug and Play",
1054         .get = isapnp_get_resources,
1055         .set = isapnp_set_resources,
1056         .disable = isapnp_disable_resources,
1057 };
1058
1059 static int __init isapnp_init(void)
1060 {
1061         int cards;
1062         struct pnp_card *card;
1063         struct pnp_dev *dev;
1064
1065         if (isapnp_disable) {
1066                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1067                 return 0;
1068         }
1069 #ifdef CONFIG_PPC_MERGE
1070         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1071                 return -EINVAL;
1072 #endif
1073 #ifdef ISAPNP_REGION_OK
1074         if (!request_region(_PIDXR, 1, "isapnp index")) {
1075                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1076                        _PIDXR);
1077                 return -EBUSY;
1078         }
1079 #endif
1080         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1081                 printk(KERN_ERR
1082                        "isapnp: Write Data Register 0x%x already used\n",
1083                        _PNPWRP);
1084 #ifdef ISAPNP_REGION_OK
1085                 release_region(_PIDXR, 1);
1086 #endif
1087                 return -EBUSY;
1088         }
1089
1090         if (pnp_register_protocol(&isapnp_protocol) < 0)
1091                 return -EBUSY;
1092
1093         /*
1094          *      Print a message. The existing ISAPnP code is hanging machines
1095          *      so let the user know where.
1096          */
1097
1098         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1099         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1100                 isapnp_rdp |= 3;
1101                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1102                         printk(KERN_ERR
1103                                "isapnp: Read Data Register 0x%x already used\n",
1104                                isapnp_rdp);
1105 #ifdef ISAPNP_REGION_OK
1106                         release_region(_PIDXR, 1);
1107 #endif
1108                         release_region(_PNPWRP, 1);
1109                         return -EBUSY;
1110                 }
1111                 isapnp_set_rdp();
1112         }
1113         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1114                 cards = isapnp_isolate();
1115                 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1116 #ifdef ISAPNP_REGION_OK
1117                         release_region(_PIDXR, 1);
1118 #endif
1119                         release_region(_PNPWRP, 1);
1120                         printk(KERN_INFO
1121                                "isapnp: No Plug & Play device found\n");
1122                         return 0;
1123                 }
1124                 request_region(isapnp_rdp, 1, "isapnp read");
1125         }
1126         isapnp_build_device_list();
1127         cards = 0;
1128
1129         protocol_for_each_card(&isapnp_protocol, card) {
1130                 cards++;
1131                 if (isapnp_verbose) {
1132                         printk(KERN_INFO "isapnp: Card '%s'\n",
1133                                card->name[0] ? card->name : "Unknown");
1134                         if (isapnp_verbose < 2)
1135                                 continue;
1136                         card_for_each_dev(card, dev) {
1137                                 printk(KERN_INFO "isapnp:   Device '%s'\n",
1138                                        dev->name[0] ? dev->name : "Unknown");
1139                         }
1140                 }
1141         }
1142         if (cards)
1143                 printk(KERN_INFO
1144                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1145                        cards > 1 ? "s" : "");
1146         else
1147                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1148
1149         isapnp_proc_init();
1150         return 0;
1151 }
1152
1153 device_initcall(isapnp_init);
1154
1155 /* format is: noisapnp */
1156
1157 static int __init isapnp_setup_disable(char *str)
1158 {
1159         isapnp_disable = 1;
1160         return 1;
1161 }
1162
1163 __setup("noisapnp", isapnp_setup_disable);
1164
1165 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1166
1167 static int __init isapnp_setup_isapnp(char *str)
1168 {
1169         (void)((get_option(&str, &isapnp_rdp) == 2) &&
1170                (get_option(&str, &isapnp_reset) == 2) &&
1171                (get_option(&str, &isapnp_verbose) == 2));
1172         return 1;
1173 }
1174
1175 __setup("isapnp=", isapnp_setup_isapnp);