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