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   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                 release_region(old_rdp, 1);
 226                 old_rdp = 0;
 227         }
 228         while (rdp <= 0x3ff) {
 229                 /*
 230                  *      We cannot use NE2000 probe spaces for ISAPnP or we
 231                  *      will lock up machines.
 232                  */
 233                 if ((rdp < 0x280 || rdp > 0x380)
 234                     && request_region(rdp, 1, "ISAPnP")) {
 235                         isapnp_rdp = rdp;
 236                         old_rdp = rdp;
 237                         return 0;
 238                 }
 239                 rdp += RDP_STEP;
 240         }
 241         return -1;
 242 }
 243
 244 /* Set read port address */
 245 static inline void isapnp_set_rdp(void)
 246 {
 247         isapnp_write_byte(0x00, isapnp_rdp >> 2);
 248         udelay(100);
 249 }
 250
 251 /*
 252  *      Perform an isolation. The port selection code now tries to avoid
 253  *      "dangerous to read" ports.
 254  */
 255 static int __init isapnp_isolate_rdp_select(void)
 256 {
 257         isapnp_wait();
 258         isapnp_key();
 259
 260         /* Control: reset CSN and conditionally everything else too */
 261         isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
 262         mdelay(2);
 263
 264         isapnp_wait();
 265         isapnp_key();
 266         isapnp_wake(0x00);
 267
 268         if (isapnp_next_rdp() < 0) {
 269                 isapnp_wait();
 270                 return -1;
 271         }
 272
 273         isapnp_set_rdp();
 274         udelay(1000);
 275         write_address(0x01);
 276         udelay(1000);
 277         return 0;
 278 }
 279
 280 /*
 281  *  Isolate (assign uniqued CSN) to all ISA PnP devices.
 282  */
 283 static int __init isapnp_isolate(void)
 284 {
 285         unsigned char checksum = 0x6a;
 286         unsigned char chksum = 0x00;
 287         unsigned char bit = 0x00;
 288         int data;
 289         int csn = 0;
 290         int i;
 291         int iteration = 1;
 292
 293         isapnp_rdp = 0x213;
 294         if (isapnp_isolate_rdp_select() < 0)
 295                 return -1;
 296
 297         while (1) {
 298                 for (i = 1; i <= 64; i++) {
 299                         data = read_data() << 8;
 300                         udelay(250);
 301                         data = data | read_data();
 302                         udelay(250);
 303                         if (data == 0x55aa)
 304                                 bit = 0x01;
 305                         checksum =
 306                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 307                             | (checksum >> 1);
 308                         bit = 0x00;
 309                 }
 310                 for (i = 65; i <= 72; i++) {
 311                         data = read_data() << 8;
 312                         udelay(250);
 313                         data = data | read_data();
 314                         udelay(250);
 315                         if (data == 0x55aa)
 316                                 chksum |= (1 << (i - 65));
 317                 }
 318                 if (checksum != 0x00 && checksum == chksum) {
 319                         csn++;
 320
 321                         isapnp_write_byte(0x06, csn);
 322                         udelay(250);
 323                         iteration++;
 324                         isapnp_wake(0x00);
 325                         isapnp_set_rdp();
 326                         udelay(1000);
 327                         write_address(0x01);
 328                         udelay(1000);
 329                         goto __next;
 330                 }
 331                 if (iteration == 1) {
 332                         isapnp_rdp += RDP_STEP;
 333                         if (isapnp_isolate_rdp_select() < 0)
 334                                 return -1;
 335                 } else if (iteration > 1) {
 336                         break;
 337                 }
 338               __next:
 339                 if (csn == 255)
 340                         break;
 341                 checksum = 0x6a;
 342                 chksum = 0x00;
 343                 bit = 0x00;
 344         }
 345         isapnp_wait();
 346         isapnp_csn_count = csn;
 347         return csn;
 348 }
 349
 350 /*
 351  *  Read one tag from stream.
 352  */
 353 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
 354 {
 355         unsigned char tag, tmp[2];
 356
 357         isapnp_peek(&tag, 1);
 358         if (tag == 0)           /* invalid tag */
 359                 return -1;
 360         if (tag & 0x80) {       /* large item */
 361                 *type = tag;
 362                 isapnp_peek(tmp, 2);
 363                 *size = (tmp[1] << 8) | tmp[0];
 364         } else {
 365                 *type = (tag >> 3) & 0x0f;
 366                 *size = tag & 0x07;
 367         }
 368 #if 0
 369         printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type,
 370                *size);
 371 #endif
 372         if (*type == 0xff && *size == 0xffff)   /* probably invalid data */
 373                 return -1;
 374         return 0;
 375 }
 376
 377 /*
 378  *  Skip specified number of bytes from stream.
 379  */
 380 static void __init isapnp_skip_bytes(int count)
 381 {
 382         isapnp_peek(NULL, count);
 383 }
 384
 385 /*
 386  *  Parse EISA id.
 387  */
 388 static void isapnp_parse_id(struct pnp_dev *dev, unsigned short vendor,
 389                             unsigned short device)
 390 {
 391         struct pnp_id *id;
 392
 393         if (!dev)
 394                 return;
 395         id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 396         if (!id)
 397                 return;
 398         sprintf(id->id, "%c%c%c%x%x%x%x",
 399                 'A' + ((vendor >> 2) & 0x3f) - 1,
 400                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
 401                 'A' + ((vendor >> 8) & 0x1f) - 1,
 402                 (device >> 4) & 0x0f,
 403                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
 404         pnp_add_id(id, dev);
 405 }
 406
 407 /*
 408  *  Parse logical device tag.
 409  */
 410 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
 411                                                   int size, int number)
 412 {
 413         unsigned char tmp[6];
 414         struct pnp_dev *dev;
 415
 416         isapnp_peek(tmp, size);
 417         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 418         if (!dev)
 419                 return NULL;
 420         dev->number = number;
 421         isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0], (tmp[3] << 8) | tmp[2]);
 422         dev->regs = tmp[4];
 423         dev->card = card;
 424         if (size > 5)
 425                 dev->regs |= tmp[5] << 8;
 426         dev->protocol = &isapnp_protocol;
 427         dev->capabilities |= PNP_CONFIGURABLE;
 428         dev->capabilities |= PNP_READ;
 429         dev->capabilities |= PNP_WRITE;
 430         dev->capabilities |= PNP_DISABLE;
 431         pnp_init_resource_table(&dev->res);
 432         return dev;
 433 }
 434
 435 /*
 436  *  Add IRQ resource to resources list.
 437  */
 438 static void __init isapnp_parse_irq_resource(struct pnp_option *option,
 439                                              int size)
 440 {
 441         unsigned char tmp[3];
 442         struct pnp_irq *irq;
 443         unsigned long bits;
 444
 445         isapnp_peek(tmp, size);
 446         irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
 447         if (!irq)
 448                 return;
 449         bits = (tmp[1] << 8) | tmp[0];
 450         bitmap_copy(irq->map, &bits, 16);
 451         if (size > 2)
 452                 irq->flags = tmp[2];
 453         else
 454                 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
 455         pnp_register_irq_resource(option, irq);
 456 }
 457
 458 /*
 459  *  Add DMA resource to resources list.
 460  */
 461 static void __init isapnp_parse_dma_resource(struct pnp_option *option,
 462                                              int size)
 463 {
 464         unsigned char tmp[2];
 465         struct pnp_dma *dma;
 466
 467         isapnp_peek(tmp, size);
 468         dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
 469         if (!dma)
 470                 return;
 471         dma->map = tmp[0];
 472         dma->flags = tmp[1];
 473         pnp_register_dma_resource(option, dma);
 474 }
 475
 476 /*
 477  *  Add port resource to resources list.
 478  */
 479 static void __init isapnp_parse_port_resource(struct pnp_option *option,
 480                                               int size)
 481 {
 482         unsigned char tmp[7];
 483         struct pnp_port *port;
 484
 485         isapnp_peek(tmp, size);
 486         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 487         if (!port)
 488                 return;
 489         port->min = (tmp[2] << 8) | tmp[1];
 490         port->max = (tmp[4] << 8) | tmp[3];
 491         port->align = tmp[5];
 492         port->size = tmp[6];
 493         port->flags = tmp[0] ? PNP_PORT_FLAG_16BITADDR : 0;
 494         pnp_register_port_resource(option, port);
 495 }
 496
 497 /*
 498  *  Add fixed port resource to resources list.
 499  */
 500 static void __init isapnp_parse_fixed_port_resource(struct pnp_option *option,
 501                                                     int size)
 502 {
 503         unsigned char tmp[3];
 504         struct pnp_port *port;
 505
 506         isapnp_peek(tmp, size);
 507         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 508         if (!port)
 509                 return;
 510         port->min = port->max = (tmp[1] << 8) | tmp[0];
 511         port->size = tmp[2];
 512         port->align = 0;
 513         port->flags = PNP_PORT_FLAG_FIXED;
 514         pnp_register_port_resource(option, port);
 515 }
 516
 517 /*
 518  *  Add memory resource to resources list.
 519  */
 520 static void __init isapnp_parse_mem_resource(struct pnp_option *option,
 521                                              int size)
 522 {
 523         unsigned char tmp[9];
 524         struct pnp_mem *mem;
 525
 526         isapnp_peek(tmp, size);
 527         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 528         if (!mem)
 529                 return;
 530         mem->min = ((tmp[2] << 8) | tmp[1]) << 8;
 531         mem->max = ((tmp[4] << 8) | tmp[3]) << 8;
 532         mem->align = (tmp[6] << 8) | tmp[5];
 533         mem->size = ((tmp[8] << 8) | tmp[7]) << 8;
 534         mem->flags = tmp[0];
 535         pnp_register_mem_resource(option, mem);
 536 }
 537
 538 /*
 539  *  Add 32-bit memory resource to resources list.
 540  */
 541 static void __init isapnp_parse_mem32_resource(struct pnp_option *option,
 542                                                int size)
 543 {
 544         unsigned char tmp[17];
 545         struct pnp_mem *mem;
 546
 547         isapnp_peek(tmp, size);
 548         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 549         if (!mem)
 550                 return;
 551         mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 552         mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 553         mem->align =
 554             (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
 555         mem->size =
 556             (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
 557         mem->flags = tmp[0];
 558         pnp_register_mem_resource(option, mem);
 559 }
 560
 561 /*
 562  *  Add 32-bit fixed memory resource to resources list.
 563  */
 564 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_option *option,
 565                                                      int size)
 566 {
 567         unsigned char tmp[9];
 568         struct pnp_mem *mem;
 569
 570         isapnp_peek(tmp, size);
 571         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 572         if (!mem)
 573                 return;
 574         mem->min = mem->max =
 575             (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 576         mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 577         mem->align = 0;
 578         mem->flags = tmp[0];
 579         pnp_register_mem_resource(option, mem);
 580 }
 581
 582 /*
 583  *  Parse card name for ISA PnP device.
 584  */
 585 static void __init
 586 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
 587 {
 588         if (name[0] == '\0') {
 589                 unsigned short size1 =
 590                     *size >= name_max ? (name_max - 1) : *size;
 591                 isapnp_peek(name, size1);
 592                 name[size1] = '\0';
 593                 *size -= size1;
 594
 595                 /* clean whitespace from end of string */
 596                 while (size1 > 0 && name[--size1] == ' ')
 597                         name[size1] = '\0';
 598         }
 599 }
 600
 601 /*
 602  *  Parse resource map for logical device.
 603  */
 604 static int __init isapnp_create_device(struct pnp_card *card,
 605                                        unsigned short size)
 606 {
 607         int number = 0, skip = 0, priority = 0, compat = 0;
 608         unsigned char type, tmp[17];
 609         struct pnp_option *option;
 610         struct pnp_dev *dev;
 611
 612         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
 613                 return 1;
 614         option = pnp_register_independent_option(dev);
 615         if (!option) {
 616                 kfree(dev);
 617                 return 1;
 618         }
 619         pnp_add_card_device(card, dev);
 620
 621         while (1) {
 622                 if (isapnp_read_tag(&type, &size) < 0)
 623                         return 1;
 624                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
 625                         goto __skip;
 626                 switch (type) {
 627                 case _STAG_LOGDEVID:
 628                         if (size >= 5 && size <= 6) {
 629                                 if ((dev =
 630                                      isapnp_parse_device(card, size,
 631                                                          number++)) == NULL)
 632                                         return 1;
 633                                 size = 0;
 634                                 skip = 0;
 635                                 option = pnp_register_independent_option(dev);
 636                                 if (!option) {
 637                                         kfree(dev);
 638                                         return 1;
 639                                 }
 640                                 pnp_add_card_device(card, dev);
 641                         } else {
 642                                 skip = 1;
 643                         }
 644                         priority = 0;
 645                         compat = 0;
 646                         break;
 647                 case _STAG_COMPATDEVID:
 648                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
 649                                 isapnp_peek(tmp, 4);
 650                                 isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0],
 651                                                 (tmp[3] << 8) | tmp[2]);
 652                                 compat++;
 653                                 size = 0;
 654                         }
 655                         break;
 656                 case _STAG_IRQ:
 657                         if (size < 2 || size > 3)
 658                                 goto __skip;
 659                         isapnp_parse_irq_resource(option, size);
 660                         size = 0;
 661                         break;
 662                 case _STAG_DMA:
 663                         if (size != 2)
 664                                 goto __skip;
 665                         isapnp_parse_dma_resource(option, size);
 666                         size = 0;
 667                         break;
 668                 case _STAG_STARTDEP:
 669                         if (size > 1)
 670                                 goto __skip;
 671                         priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
 672                         if (size > 0) {
 673                                 isapnp_peek(tmp, size);
 674                                 priority = 0x100 | tmp[0];
 675                                 size = 0;
 676                         }
 677                         option = pnp_register_dependent_option(dev, priority);
 678                         if (!option)
 679                                 return 1;
 680                         break;
 681                 case _STAG_ENDDEP:
 682                         if (size != 0)
 683                                 goto __skip;
 684                         priority = 0;
 685                         break;
 686                 case _STAG_IOPORT:
 687                         if (size != 7)
 688                                 goto __skip;
 689                         isapnp_parse_port_resource(option, size);
 690                         size = 0;
 691                         break;
 692                 case _STAG_FIXEDIO:
 693                         if (size != 3)
 694                                 goto __skip;
 695                         isapnp_parse_fixed_port_resource(option, size);
 696                         size = 0;
 697                         break;
 698                 case _STAG_VENDOR:
 699                         break;
 700                 case _LTAG_MEMRANGE:
 701                         if (size != 9)
 702                                 goto __skip;
 703                         isapnp_parse_mem_resource(option, size);
 704                         size = 0;
 705                         break;
 706                 case _LTAG_ANSISTR:
 707                         isapnp_parse_name(dev->name, sizeof(dev->name), &size);
 708                         break;
 709                 case _LTAG_UNICODESTR:
 710                         /* silently ignore */
 711                         /* who use unicode for hardware identification? */
 712                         break;
 713                 case _LTAG_VENDOR:
 714                         break;
 715                 case _LTAG_MEM32RANGE:
 716                         if (size != 17)
 717                                 goto __skip;
 718                         isapnp_parse_mem32_resource(option, size);
 719                         size = 0;
 720                         break;
 721                 case _LTAG_FIXEDMEM32RANGE:
 722                         if (size != 9)
 723                                 goto __skip;
 724                         isapnp_parse_fixed_mem32_resource(option, size);
 725                         size = 0;
 726                         break;
 727                 case _STAG_END:
 728                         if (size > 0)
 729                                 isapnp_skip_bytes(size);
 730                         return 1;
 731                 default:
 732                         printk(KERN_ERR
 733                                "isapnp: unexpected or unknown tag type 0x%x for logical device %i (device %i), ignored\n",
 734                                type, dev->number, card->number);
 735                 }
 736               __skip:
 737                 if (size > 0)
 738                         isapnp_skip_bytes(size);
 739         }
 740         return 0;
 741 }
 742
 743 /*
 744  *  Parse resource map for ISA PnP card.
 745  */
 746 static void __init isapnp_parse_resource_map(struct pnp_card *card)
 747 {
 748         unsigned char type, tmp[17];
 749         unsigned short size;
 750
 751         while (1) {
 752                 if (isapnp_read_tag(&type, &size) < 0)
 753                         return;
 754                 switch (type) {
 755                 case _STAG_PNPVERNO:
 756                         if (size != 2)
 757                                 goto __skip;
 758                         isapnp_peek(tmp, 2);
 759                         card->pnpver = tmp[0];
 760                         card->productver = tmp[1];
 761                         size = 0;
 762                         break;
 763                 case _STAG_LOGDEVID:
 764                         if (size >= 5 && size <= 6) {
 765                                 if (isapnp_create_device(card, size) == 1)
 766                                         return;
 767                                 size = 0;
 768                         }
 769                         break;
 770                 case _STAG_VENDOR:
 771                         break;
 772                 case _LTAG_ANSISTR:
 773                         isapnp_parse_name(card->name, sizeof(card->name),
 774                                           &size);
 775                         break;
 776                 case _LTAG_UNICODESTR:
 777                         /* silently ignore */
 778                         /* who use unicode for hardware identification? */
 779                         break;
 780                 case _LTAG_VENDOR:
 781                         break;
 782                 case _STAG_END:
 783                         if (size > 0)
 784                                 isapnp_skip_bytes(size);
 785                         return;
 786                 default:
 787                         printk(KERN_ERR
 788                                "isapnp: unexpected or unknown tag type 0x%x for device %i, ignored\n",
 789                                type, card->number);
 790                 }
 791               __skip:
 792                 if (size > 0)
 793                         isapnp_skip_bytes(size);
 794         }
 795 }
 796
 797 /*
 798  *  Compute ISA PnP checksum for first eight bytes.
 799  */
 800 static unsigned char __init isapnp_checksum(unsigned char *data)
 801 {
 802         int i, j;
 803         unsigned char checksum = 0x6a, bit, b;
 804
 805         for (i = 0; i < 8; i++) {
 806                 b = data[i];
 807                 for (j = 0; j < 8; j++) {
 808                         bit = 0;
 809                         if (b & (1 << j))
 810                                 bit = 1;
 811                         checksum =
 812                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 813                             | (checksum >> 1);
 814                 }
 815         }
 816         return checksum;
 817 }
 818
 819 /*
 820  *  Parse EISA id for ISA PnP card.
 821  */
 822 static void isapnp_parse_card_id(struct pnp_card *card, unsigned short vendor,
 823                                  unsigned short device)
 824 {
 825         struct pnp_id *id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 826
 827         if (!id)
 828                 return;
 829         sprintf(id->id, "%c%c%c%x%x%x%x",
 830                 'A' + ((vendor >> 2) & 0x3f) - 1,
 831                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
 832                 'A' + ((vendor >> 8) & 0x1f) - 1,
 833                 (device >> 4) & 0x0f,
 834                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
 835         pnp_add_card_id(id, card);
 836 }
 837
 838 /*
 839  *  Build device list for all present ISA PnP devices.
 840  */
 841 static int __init isapnp_build_device_list(void)
 842 {
 843         int csn;
 844         unsigned char header[9], checksum;
 845         struct pnp_card *card;
 846
 847         isapnp_wait();
 848         isapnp_key();
 849         for (csn = 1; csn <= isapnp_csn_count; csn++) {
 850                 isapnp_wake(csn);
 851                 isapnp_peek(header, 9);
 852                 checksum = isapnp_checksum(header);
 853 #if 0
 854                 printk(KERN_DEBUG
 855                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
 856                        header[0], header[1], header[2], header[3], header[4],
 857                        header[5], header[6], header[7], header[8]);
 858                 printk(KERN_DEBUG "checksum = 0x%x\n", checksum);
 859 #endif
 860                 if ((card =
 861                      kzalloc(sizeof(struct pnp_card), GFP_KERNEL)) == NULL)
 862                         continue;
 863
 864                 card->number = csn;
 865                 INIT_LIST_HEAD(&card->devices);
 866                 isapnp_parse_card_id(card, (header[1] << 8) | header[0],
 867                                      (header[3] << 8) | header[2]);
 868                 card->serial =
 869                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
 870                     header[4];
 871                 isapnp_checksum_value = 0x00;
 872                 isapnp_parse_resource_map(card);
 873                 if (isapnp_checksum_value != 0x00)
 874                         printk(KERN_ERR
 875                                "isapnp: checksum for device %i is not valid (0x%x)\n",
 876                                csn, isapnp_checksum_value);
 877                 card->checksum = isapnp_checksum_value;
 878                 card->protocol = &isapnp_protocol;
 879
 880                 pnp_add_card(card);
 881         }
 882         isapnp_wait();
 883         return 0;
 884 }
 885
 886 /*
 887  *  Basic configuration routines.
 888  */
 889
 890 int isapnp_present(void)
 891 {
 892         struct pnp_card *card;
 893
 894         pnp_for_each_card(card) {
 895                 if (card->protocol == &isapnp_protocol)
 896                         return 1;
 897         }
 898         return 0;
 899 }
 900
 901 int isapnp_cfg_begin(int csn, int logdev)
 902 {
 903         if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
 904                 return -EINVAL;
 905         mutex_lock(&isapnp_cfg_mutex);
 906         isapnp_wait();
 907         isapnp_key();
 908         isapnp_wake(csn);
 909 #if 0
 910         /* to avoid malfunction when the isapnptools package is used */
 911         /* we must set RDP to our value again */
 912         /* it is possible to set RDP only in the isolation phase */
 913         /*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
 914         isapnp_write_byte(0x02, 0x04);  /* clear CSN of card */
 915         mdelay(2);              /* is this necessary? */
 916         isapnp_wake(csn);       /* bring card into sleep state */
 917         isapnp_wake(0);         /* bring card into isolation state */
 918         isapnp_set_rdp();       /* reset the RDP port */
 919         udelay(1000);           /* delay 1000us */
 920         isapnp_write_byte(0x06, csn);   /* reset CSN to previous value */
 921         udelay(250);            /* is this necessary? */
 922 #endif
 923         if (logdev >= 0)
 924                 isapnp_device(logdev);
 925         return 0;
 926 }
 927
 928 int isapnp_cfg_end(void)
 929 {
 930         isapnp_wait();
 931         mutex_unlock(&isapnp_cfg_mutex);
 932         return 0;
 933 }
 934
 935 /*
 936  *  Initialization.
 937  */
 938
 939 EXPORT_SYMBOL(isapnp_protocol);
 940 EXPORT_SYMBOL(isapnp_present);
 941 EXPORT_SYMBOL(isapnp_cfg_begin);
 942 EXPORT_SYMBOL(isapnp_cfg_end);
 943 #if 0
 944 EXPORT_SYMBOL(isapnp_read_byte);
 945 #endif
 946 EXPORT_SYMBOL(isapnp_write_byte);
 947
 948 static int isapnp_read_resources(struct pnp_dev *dev,
 949                                  struct pnp_resource_table *res)
 950 {
 951         int tmp, ret;
 952
 953         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
 954         if (dev->active) {
 955                 for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) {
 956                         ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
 957                         if (!ret)
 958                                 continue;
 959                         res->port_resource[tmp].start = ret;
 960                         res->port_resource[tmp].flags = IORESOURCE_IO;
 961                 }
 962                 for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) {
 963                         ret =
 964                             isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
 965                         if (!ret)
 966                                 continue;
 967                         res->mem_resource[tmp].start = ret;
 968                         res->mem_resource[tmp].flags = IORESOURCE_MEM;
 969                 }
 970                 for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) {
 971                         ret =
 972                             (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >>
 973                              8);
 974                         if (!ret)
 975                                 continue;
 976                         res->irq_resource[tmp].start =
 977                             res->irq_resource[tmp].end = ret;
 978                         res->irq_resource[tmp].flags = IORESOURCE_IRQ;
 979                 }
 980                 for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) {
 981                         ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
 982                         if (ret == 4)
 983                                 continue;
 984                         res->dma_resource[tmp].start =
 985                             res->dma_resource[tmp].end = ret;
 986                         res->dma_resource[tmp].flags = IORESOURCE_DMA;
 987                 }
 988         }
 989         return 0;
 990 }
 991
 992 static int isapnp_get_resources(struct pnp_dev *dev,
 993                                 struct pnp_resource_table *res)
 994 {
 995         int ret;
 996         pnp_init_resource_table(res);
 997         isapnp_cfg_begin(dev->card->number, dev->number);
 998         ret = isapnp_read_resources(dev, res);
 999         isapnp_cfg_end();
1000         return ret;
1001 }
1002
1003 static int isapnp_set_resources(struct pnp_dev *dev,
1004                                 struct pnp_resource_table *res)
1005 {
1006         int tmp;
1007
1008         isapnp_cfg_begin(dev->card->number, dev->number);
1009         dev->active = 1;
1010         for (tmp = 0;
1011              tmp < PNP_MAX_PORT
1012              && (res->port_resource[tmp].
1013                  flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO;
1014              tmp++)
1015                 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
1016                                   res->port_resource[tmp].start);
1017         for (tmp = 0;
1018              tmp < PNP_MAX_IRQ
1019              && (res->irq_resource[tmp].
1020                  flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ;
1021              tmp++) {
1022                 int irq = res->irq_resource[tmp].start;
1023                 if (irq == 2)
1024                         irq = 9;
1025                 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
1026         }
1027         for (tmp = 0;
1028              tmp < PNP_MAX_DMA
1029              && (res->dma_resource[tmp].
1030                  flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA;
1031              tmp++)
1032                 isapnp_write_byte(ISAPNP_CFG_DMA + tmp,
1033                                   res->dma_resource[tmp].start);
1034         for (tmp = 0;
1035              tmp < PNP_MAX_MEM
1036              && (res->mem_resource[tmp].
1037                  flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM;
1038              tmp++)
1039                 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
1040                                   (res->mem_resource[tmp].start >> 8) & 0xffff);
1041         /* FIXME: We aren't handling 32bit mems properly here */
1042         isapnp_activate(dev->number);
1043         isapnp_cfg_end();
1044         return 0;
1045 }
1046
1047 static int isapnp_disable_resources(struct pnp_dev *dev)
1048 {
1049         if (!dev || !dev->active)
1050                 return -EINVAL;
1051         isapnp_cfg_begin(dev->card->number, dev->number);
1052         isapnp_deactivate(dev->number);
1053         dev->active = 0;
1054         isapnp_cfg_end();
1055         return 0;
1056 }
1057
1058 struct pnp_protocol isapnp_protocol = {
1059         .name = "ISA Plug and Play",
1060         .get = isapnp_get_resources,
1061         .set = isapnp_set_resources,
1062         .disable = isapnp_disable_resources,
1063 };
1064
1065 static int __init isapnp_init(void)
1066 {
1067         int cards;
1068         struct pnp_card *card;
1069         struct pnp_dev *dev;
1070
1071         if (isapnp_disable) {
1072                 isapnp_detected = 0;
1073                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1074                 return 0;
1075         }
1076 #ifdef CONFIG_PPC_MERGE
1077         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1078                 return -EINVAL;
1079 #endif
1080 #ifdef ISAPNP_REGION_OK
1081         if (!request_region(_PIDXR, 1, "isapnp index")) {
1082                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1083                        _PIDXR);
1084                 return -EBUSY;
1085         }
1086 #endif
1087         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1088                 printk(KERN_ERR
1089                        "isapnp: Write Data Register 0x%x already used\n",
1090                        _PNPWRP);
1091 #ifdef ISAPNP_REGION_OK
1092                 release_region(_PIDXR, 1);
1093 #endif
1094                 return -EBUSY;
1095         }
1096
1097         if (pnp_register_protocol(&isapnp_protocol) < 0)
1098                 return -EBUSY;
1099
1100         /*
1101          *      Print a message. The existing ISAPnP code is hanging machines
1102          *      so let the user know where.
1103          */
1104
1105         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1106         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1107                 isapnp_rdp |= 3;
1108                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1109                         printk(KERN_ERR
1110                                "isapnp: Read Data Register 0x%x already used\n",
1111                                isapnp_rdp);
1112 #ifdef ISAPNP_REGION_OK
1113                         release_region(_PIDXR, 1);
1114 #endif
1115                         release_region(_PNPWRP, 1);
1116                         return -EBUSY;
1117                 }
1118                 isapnp_set_rdp();
1119         }
1120         isapnp_detected = 1;
1121         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1122                 cards = isapnp_isolate();
1123                 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1124 #ifdef ISAPNP_REGION_OK
1125                         release_region(_PIDXR, 1);
1126 #endif
1127                         release_region(_PNPWRP, 1);
1128                         isapnp_detected = 0;
1129                         printk(KERN_INFO
1130                                "isapnp: No Plug & Play device found\n");
1131                         return 0;
1132                 }
1133                 request_region(isapnp_rdp, 1, "isapnp read");
1134         }
1135         isapnp_build_device_list();
1136         cards = 0;
1137
1138         protocol_for_each_card(&isapnp_protocol, card) {
1139                 cards++;
1140                 if (isapnp_verbose) {
1141                         printk(KERN_INFO "isapnp: Card '%s'\n",
1142                                card->name[0] ? card->name : "Unknown");
1143                         if (isapnp_verbose < 2)
1144                                 continue;
1145                         card_for_each_dev(card, dev) {
1146                                 printk(KERN_INFO "isapnp:   Device '%s'\n",
1147                                        dev->name[0] ? dev->name : "Unknown");
1148                         }
1149                 }
1150         }
1151         if (cards) {
1152                 printk(KERN_INFO
1153                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1154                        cards > 1 ? "s" : "");
1155         } else {
1156                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1157         }
1158
1159         isapnp_proc_init();
1160         return 0;
1161 }
1162
1163 device_initcall(isapnp_init);
1164
1165 /* format is: noisapnp */
1166
1167 static int __init isapnp_setup_disable(char *str)
1168 {
1169         isapnp_disable = 1;
1170         return 1;
1171 }
1172
1173 __setup("noisapnp", isapnp_setup_disable);
1174
1175 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1176
1177 static int __init isapnp_setup_isapnp(char *str)
1178 {
1179         (void)((get_option(&str, &isapnp_rdp) == 2) &&
1180                (get_option(&str, &isapnp_reset) == 2) &&
1181                (get_option(&str, &isapnp_verbose) == 2));
1182         return 1;
1183 }
1184
1185 __setup("isapnp=", isapnp_setup_isapnp);