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   1 /*
   2  *  ISA Plug & Play support
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  *
  20  *  Changelog:
  21  *  2000-01-01  Added quirks handling for buggy hardware
  22  *              Peter Denison <peterd@pnd-pc.demon.co.uk>
  23  *  2000-06-14  Added isapnp_probe_devs() and isapnp_activate_dev()
  24  *              Christoph Hellwig <hch@infradead.org>
  25  *  2001-06-03  Added release_region calls to correspond with
  26  *              request_region calls when a failure occurs.  Also
  27  *              added KERN_* constants to printk() calls.
  28  *  2001-11-07  Added isapnp_{,un}register_driver calls along the lines
  29  *              of the pci driver interface
  30  *              Kai Germaschewski <kai.germaschewski@gmx.de>
  31  *  2002-06-06  Made the use of dma channel 0 configurable
  32  *              Gerald Teschl <gerald.teschl@univie.ac.at>
  33  *  2002-10-06  Ported to PnP Layer - Adam Belay <ambx1@neo.rr.com>
  34  *  2003-08-11  Resource Management Updates - Adam Belay <ambx1@neo.rr.com>
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  40 #include <linux/slab.h>
  41 #include <linux/delay.h>
  42 #include <linux/init.h>
  43 #include <linux/isapnp.h>
  44 #include <linux/mutex.h>
  45 #include <asm/io.h>
  46
  47 #include "../base.h"
  48
  49 #if 0
  50 #define ISAPNP_REGION_OK
  51 #endif
  52
  53 int isapnp_disable;             /* Disable ISA PnP */
  54 static int isapnp_rdp;          /* Read Data Port */
  55 static int isapnp_reset = 1;    /* reset all PnP cards (deactivate) */
  56 static int isapnp_verbose = 1;  /* verbose mode */
  57
  58 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  59 MODULE_DESCRIPTION("Generic ISA Plug & Play support");
  60 module_param(isapnp_disable, int, 0);
  61 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable");
  62 module_param(isapnp_rdp, int, 0);
  63 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port");
  64 module_param(isapnp_reset, int, 0);
  65 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards");
  66 module_param(isapnp_verbose, int, 0);
  67 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode");
  68 MODULE_LICENSE("GPL");
  69
  70 #define _PIDXR          0x279
  71 #define _PNPWRP         0xa79
  72
  73 /* short tags */
  74 #define _STAG_PNPVERNO          0x01
  75 #define _STAG_LOGDEVID          0x02
  76 #define _STAG_COMPATDEVID       0x03
  77 #define _STAG_IRQ               0x04
  78 #define _STAG_DMA               0x05
  79 #define _STAG_STARTDEP          0x06
  80 #define _STAG_ENDDEP            0x07
  81 #define _STAG_IOPORT            0x08
  82 #define _STAG_FIXEDIO           0x09
  83 #define _STAG_VENDOR            0x0e
  84 #define _STAG_END               0x0f
  85 /* long tags */
  86 #define _LTAG_MEMRANGE          0x81
  87 #define _LTAG_ANSISTR           0x82
  88 #define _LTAG_UNICODESTR        0x83
  89 #define _LTAG_VENDOR            0x84
  90 #define _LTAG_MEM32RANGE        0x85
  91 #define _LTAG_FIXEDMEM32RANGE   0x86
  92
  93 /* Logical device control and configuration registers */
  94
  95 #define ISAPNP_CFG_ACTIVATE     0x30    /* byte */
  96 #define ISAPNP_CFG_MEM          0x40    /* 4 * dword */
  97 #define ISAPNP_CFG_PORT         0x60    /* 8 * word */
  98 #define ISAPNP_CFG_IRQ          0x70    /* 2 * word */
  99 #define ISAPNP_CFG_DMA          0x74    /* 2 * byte */
 100
 101 /*
 102  * Sizes of ISAPNP logical device configuration register sets.
 103  * See PNP-ISA-v1.0a.pdf, Appendix A.
 104  */
 105 #define ISAPNP_MAX_MEM          4
 106 #define ISAPNP_MAX_PORT         8
 107 #define ISAPNP_MAX_IRQ          2
 108 #define ISAPNP_MAX_DMA          2
 109
 110 static unsigned char isapnp_checksum_value;
 111 static DEFINE_MUTEX(isapnp_cfg_mutex);
 112 static int isapnp_csn_count;
 113
 114 /* some prototypes */
 115
 116 static inline void write_data(unsigned char x)
 117 {
 118         outb(x, _PNPWRP);
 119 }
 120
 121 static inline void write_address(unsigned char x)
 122 {
 123         outb(x, _PIDXR);
 124         udelay(20);
 125 }
 126
 127 static inline unsigned char read_data(void)
 128 {
 129         unsigned char val = inb(isapnp_rdp);
 130         return val;
 131 }
 132
 133 unsigned char isapnp_read_byte(unsigned char idx)
 134 {
 135         write_address(idx);
 136         return read_data();
 137 }
 138
 139 static unsigned short isapnp_read_word(unsigned char idx)
 140 {
 141         unsigned short val;
 142
 143         val = isapnp_read_byte(idx);
 144         val = (val << 8) + isapnp_read_byte(idx + 1);
 145         return val;
 146 }
 147
 148 void isapnp_write_byte(unsigned char idx, unsigned char val)
 149 {
 150         write_address(idx);
 151         write_data(val);
 152 }
 153
 154 static void isapnp_write_word(unsigned char idx, unsigned short val)
 155 {
 156         isapnp_write_byte(idx, val >> 8);
 157         isapnp_write_byte(idx + 1, val);
 158 }
 159
 160 static void isapnp_key(void)
 161 {
 162         unsigned char code = 0x6a, msb;
 163         int i;
 164
 165         mdelay(1);
 166         write_address(0x00);
 167         write_address(0x00);
 168
 169         write_address(code);
 170
 171         for (i = 1; i < 32; i++) {
 172                 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7;
 173                 code = (code >> 1) | msb;
 174                 write_address(code);
 175         }
 176 }
 177
 178 /* place all pnp cards in wait-for-key state */
 179 static void isapnp_wait(void)
 180 {
 181         isapnp_write_byte(0x02, 0x02);
 182 }
 183
 184 static void isapnp_wake(unsigned char csn)
 185 {
 186         isapnp_write_byte(0x03, csn);
 187 }
 188
 189 static void isapnp_device(unsigned char logdev)
 190 {
 191         isapnp_write_byte(0x07, logdev);
 192 }
 193
 194 static void isapnp_activate(unsigned char logdev)
 195 {
 196         isapnp_device(logdev);
 197         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1);
 198         udelay(250);
 199 }
 200
 201 static void isapnp_deactivate(unsigned char logdev)
 202 {
 203         isapnp_device(logdev);
 204         isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0);
 205         udelay(500);
 206 }
 207
 208 static void __init isapnp_peek(unsigned char *data, int bytes)
 209 {
 210         int i, j;
 211         unsigned char d = 0;
 212
 213         for (i = 1; i <= bytes; i++) {
 214                 for (j = 0; j < 20; j++) {
 215                         d = isapnp_read_byte(0x05);
 216                         if (d & 1)
 217                                 break;
 218                         udelay(100);
 219                 }
 220                 if (!(d & 1)) {
 221                         if (data != NULL)
 222                                 *data++ = 0xff;
 223                         continue;
 224                 }
 225                 d = isapnp_read_byte(0x04);     /* PRESDI */
 226                 isapnp_checksum_value += d;
 227                 if (data != NULL)
 228                         *data++ = d;
 229         }
 230 }
 231
 232 #define RDP_STEP        32      /* minimum is 4 */
 233
 234 static int isapnp_next_rdp(void)
 235 {
 236         int rdp = isapnp_rdp;
 237         static int old_rdp = 0;
 238
 239         if (old_rdp) {
 240                 release_region(old_rdp, 1);
 241                 old_rdp = 0;
 242         }
 243         while (rdp <= 0x3ff) {
 244                 /*
 245                  *      We cannot use NE2000 probe spaces for ISAPnP or we
 246                  *      will lock up machines.
 247                  */
 248                 if ((rdp < 0x280 || rdp > 0x380)
 249                     && request_region(rdp, 1, "ISAPnP")) {
 250                         isapnp_rdp = rdp;
 251                         old_rdp = rdp;
 252                         return 0;
 253                 }
 254                 rdp += RDP_STEP;
 255         }
 256         return -1;
 257 }
 258
 259 /* Set read port address */
 260 static inline void isapnp_set_rdp(void)
 261 {
 262         isapnp_write_byte(0x00, isapnp_rdp >> 2);
 263         udelay(100);
 264 }
 265
 266 /*
 267  *      Perform an isolation. The port selection code now tries to avoid
 268  *      "dangerous to read" ports.
 269  */
 270 static int __init isapnp_isolate_rdp_select(void)
 271 {
 272         isapnp_wait();
 273         isapnp_key();
 274
 275         /* Control: reset CSN and conditionally everything else too */
 276         isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04);
 277         mdelay(2);
 278
 279         isapnp_wait();
 280         isapnp_key();
 281         isapnp_wake(0x00);
 282
 283         if (isapnp_next_rdp() < 0) {
 284                 isapnp_wait();
 285                 return -1;
 286         }
 287
 288         isapnp_set_rdp();
 289         udelay(1000);
 290         write_address(0x01);
 291         udelay(1000);
 292         return 0;
 293 }
 294
 295 /*
 296  *  Isolate (assign uniqued CSN) to all ISA PnP devices.
 297  */
 298 static int __init isapnp_isolate(void)
 299 {
 300         unsigned char checksum = 0x6a;
 301         unsigned char chksum = 0x00;
 302         unsigned char bit = 0x00;
 303         int data;
 304         int csn = 0;
 305         int i;
 306         int iteration = 1;
 307
 308         isapnp_rdp = 0x213;
 309         if (isapnp_isolate_rdp_select() < 0)
 310                 return -1;
 311
 312         while (1) {
 313                 for (i = 1; i <= 64; i++) {
 314                         data = read_data() << 8;
 315                         udelay(250);
 316                         data = data | read_data();
 317                         udelay(250);
 318                         if (data == 0x55aa)
 319                                 bit = 0x01;
 320                         checksum =
 321                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 322                             | (checksum >> 1);
 323                         bit = 0x00;
 324                 }
 325                 for (i = 65; i <= 72; i++) {
 326                         data = read_data() << 8;
 327                         udelay(250);
 328                         data = data | read_data();
 329                         udelay(250);
 330                         if (data == 0x55aa)
 331                                 chksum |= (1 << (i - 65));
 332                 }
 333                 if (checksum != 0x00 && checksum == chksum) {
 334                         csn++;
 335
 336                         isapnp_write_byte(0x06, csn);
 337                         udelay(250);
 338                         iteration++;
 339                         isapnp_wake(0x00);
 340                         isapnp_set_rdp();
 341                         udelay(1000);
 342                         write_address(0x01);
 343                         udelay(1000);
 344                         goto __next;
 345                 }
 346                 if (iteration == 1) {
 347                         isapnp_rdp += RDP_STEP;
 348                         if (isapnp_isolate_rdp_select() < 0)
 349                                 return -1;
 350                 } else if (iteration > 1) {
 351                         break;
 352                 }
 353 __next:
 354                 if (csn == 255)
 355                         break;
 356                 checksum = 0x6a;
 357                 chksum = 0x00;
 358                 bit = 0x00;
 359         }
 360         isapnp_wait();
 361         isapnp_csn_count = csn;
 362         return csn;
 363 }
 364
 365 /*
 366  *  Read one tag from stream.
 367  */
 368 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size)
 369 {
 370         unsigned char tag, tmp[2];
 371
 372         isapnp_peek(&tag, 1);
 373         if (tag == 0)           /* invalid tag */
 374                 return -1;
 375         if (tag & 0x80) {       /* large item */
 376                 *type = tag;
 377                 isapnp_peek(tmp, 2);
 378                 *size = (tmp[1] << 8) | tmp[0];
 379         } else {
 380                 *type = (tag >> 3) & 0x0f;
 381                 *size = tag & 0x07;
 382         }
 383 #if 0
 384         printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type,
 385                *size);
 386 #endif
 387         if (*type == 0xff && *size == 0xffff)   /* probably invalid data */
 388                 return -1;
 389         return 0;
 390 }
 391
 392 /*
 393  *  Skip specified number of bytes from stream.
 394  */
 395 static void __init isapnp_skip_bytes(int count)
 396 {
 397         isapnp_peek(NULL, count);
 398 }
 399
 400 /*
 401  *  Parse logical device tag.
 402  */
 403 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
 404                                                   int size, int number)
 405 {
 406         unsigned char tmp[6];
 407         struct pnp_dev *dev;
 408         u32 eisa_id;
 409         char id[8];
 410
 411         isapnp_peek(tmp, size);
 412         eisa_id = tmp[0] | tmp[1] << 8 | tmp[2] << 16 | tmp[3] << 24;
 413         pnp_eisa_id_to_string(eisa_id, id);
 414
 415         dev = pnp_alloc_dev(&isapnp_protocol, number, id);
 416         if (!dev)
 417                 return NULL;
 418
 419         dev->regs = tmp[4];
 420         dev->card = card;
 421         if (size > 5)
 422                 dev->regs |= tmp[5] << 8;
 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         u32 eisa_id;
 608         char id[8];
 609
 610         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
 611                 return 1;
 612         option = pnp_register_independent_option(dev);
 613         if (!option) {
 614                 kfree(dev);
 615                 return 1;
 616         }
 617         pnp_add_card_device(card, dev);
 618
 619         while (1) {
 620                 if (isapnp_read_tag(&type, &size) < 0)
 621                         return 1;
 622                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
 623                         goto __skip;
 624                 switch (type) {
 625                 case _STAG_LOGDEVID:
 626                         if (size >= 5 && size <= 6) {
 627                                 if ((dev =
 628                                      isapnp_parse_device(card, size,
 629                                                          number++)) == NULL)
 630                                         return 1;
 631                                 size = 0;
 632                                 skip = 0;
 633                                 option = pnp_register_independent_option(dev);
 634                                 if (!option) {
 635                                         kfree(dev);
 636                                         return 1;
 637                                 }
 638                                 pnp_add_card_device(card, dev);
 639                         } else {
 640                                 skip = 1;
 641                         }
 642                         priority = 0;
 643                         compat = 0;
 644                         break;
 645                 case _STAG_COMPATDEVID:
 646                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
 647                                 isapnp_peek(tmp, 4);
 648                                 eisa_id = tmp[0] | tmp[1] << 8 |
 649                                           tmp[2] << 16 | tmp[3] << 24;
 650                                 pnp_eisa_id_to_string(eisa_id, id);
 651                                 pnp_add_id(dev, id);
 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         char id[8];
 826
 827         id[0] = 'A' + ((vendor >> 2) & 0x3f) - 1;
 828         id[1] = 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1;
 829         id[2] = 'A' + ((vendor >> 8) & 0x1f) - 1;
 830         id[3] = hex_asc((device >> 4) & 0x0f);
 831         id[4] = hex_asc(device & 0x0f);
 832         id[5] = hex_asc((device >> 12) & 0x0f);
 833         id[6] = hex_asc((device >> 8) & 0x0f);
 834         id[7] = '\0';
 835
 836         pnp_add_card_id(card, id);
 837 }
 838
 839 /*
 840  *  Build device list for all present ISA PnP devices.
 841  */
 842 static int __init isapnp_build_device_list(void)
 843 {
 844         int csn;
 845         unsigned char header[9], checksum;
 846         struct pnp_card *card;
 847
 848         isapnp_wait();
 849         isapnp_key();
 850         for (csn = 1; csn <= isapnp_csn_count; csn++) {
 851                 isapnp_wake(csn);
 852                 isapnp_peek(header, 9);
 853                 checksum = isapnp_checksum(header);
 854 #if 0
 855                 printk(KERN_DEBUG
 856                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
 857                        header[0], header[1], header[2], header[3], header[4],
 858                        header[5], header[6], header[7], header[8]);
 859                 printk(KERN_DEBUG "checksum = 0x%x\n", checksum);
 860 #endif
 861                 if ((card =
 862                      kzalloc(sizeof(struct pnp_card), GFP_KERNEL)) == NULL)
 863                         continue;
 864
 865                 card->number = csn;
 866                 INIT_LIST_HEAD(&card->devices);
 867                 isapnp_parse_card_id(card, (header[1] << 8) | header[0],
 868                                      (header[3] << 8) | header[2]);
 869                 card->serial =
 870                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
 871                     header[4];
 872                 isapnp_checksum_value = 0x00;
 873                 isapnp_parse_resource_map(card);
 874                 if (isapnp_checksum_value != 0x00)
 875                         printk(KERN_ERR
 876                                "isapnp: checksum for device %i is not valid (0x%x)\n",
 877                                csn, isapnp_checksum_value);
 878                 card->checksum = isapnp_checksum_value;
 879                 card->protocol = &isapnp_protocol;
 880
 881                 pnp_add_card(card);
 882         }
 883         isapnp_wait();
 884         return 0;
 885 }
 886
 887 /*
 888  *  Basic configuration routines.
 889  */
 890
 891 int isapnp_present(void)
 892 {
 893         struct pnp_card *card;
 894
 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  *  Initialization.
 938  */
 939
 940 EXPORT_SYMBOL(isapnp_protocol);
 941 EXPORT_SYMBOL(isapnp_present);
 942 EXPORT_SYMBOL(isapnp_cfg_begin);
 943 EXPORT_SYMBOL(isapnp_cfg_end);
 944 EXPORT_SYMBOL(isapnp_write_byte);
 945
 946 static int isapnp_read_resources(struct pnp_dev *dev,
 947                                  struct pnp_resource_table *res)
 948 {
 949         int tmp, ret;
 950
 951         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
 952         if (dev->active) {
 953                 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
 954                         ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
 955                         if (!ret)
 956                                 continue;
 957                         res->port_resource[tmp].start = ret;
 958                         res->port_resource[tmp].flags = IORESOURCE_IO;
 959                 }
 960                 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
 961                         ret =
 962                             isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
 963                         if (!ret)
 964                                 continue;
 965                         res->mem_resource[tmp].start = ret;
 966                         res->mem_resource[tmp].flags = IORESOURCE_MEM;
 967                 }
 968                 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
 969                         ret =
 970                             (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >>
 971                              8);
 972                         if (!ret)
 973                                 continue;
 974                         res->irq_resource[tmp].start =
 975                             res->irq_resource[tmp].end = ret;
 976                         res->irq_resource[tmp].flags = IORESOURCE_IRQ;
 977                 }
 978                 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
 979                         ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
 980                         if (ret == 4)
 981                                 continue;
 982                         res->dma_resource[tmp].start =
 983                             res->dma_resource[tmp].end = ret;
 984                         res->dma_resource[tmp].flags = IORESOURCE_DMA;
 985                 }
 986         }
 987         return 0;
 988 }
 989
 990 static int isapnp_get_resources(struct pnp_dev *dev,
 991                                 struct pnp_resource_table *res)
 992 {
 993         int ret;
 994
 995         pnp_init_resource_table(res);
 996         isapnp_cfg_begin(dev->card->number, dev->number);
 997         ret = isapnp_read_resources(dev, res);
 998         isapnp_cfg_end();
 999         return ret;
1000 }
1001
1002 static int isapnp_set_resources(struct pnp_dev *dev,
1003                                 struct pnp_resource_table *res)
1004 {
1005         int tmp;
1006
1007         isapnp_cfg_begin(dev->card->number, dev->number);
1008         dev->active = 1;
1009         for (tmp = 0;
1010              tmp < ISAPNP_MAX_PORT
1011              && (res->port_resource[tmp].
1012                  flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO;
1013              tmp++)
1014                 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
1015                                   res->port_resource[tmp].start);
1016         for (tmp = 0;
1017              tmp < ISAPNP_MAX_IRQ
1018              && (res->irq_resource[tmp].
1019                  flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ;
1020              tmp++) {
1021                 int irq = res->irq_resource[tmp].start;
1022                 if (irq == 2)
1023                         irq = 9;
1024                 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
1025         }
1026         for (tmp = 0;
1027              tmp < ISAPNP_MAX_DMA
1028              && (res->dma_resource[tmp].
1029                  flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA;
1030              tmp++)
1031                 isapnp_write_byte(ISAPNP_CFG_DMA + tmp,
1032                                   res->dma_resource[tmp].start);
1033         for (tmp = 0;
1034              tmp < ISAPNP_MAX_MEM
1035              && (res->mem_resource[tmp].
1036                  flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM;
1037              tmp++)
1038                 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
1039                                   (res->mem_resource[tmp].start >> 8) & 0xffff);
1040         /* FIXME: We aren't handling 32bit mems properly here */
1041         isapnp_activate(dev->number);
1042         isapnp_cfg_end();
1043         return 0;
1044 }
1045
1046 static int isapnp_disable_resources(struct pnp_dev *dev)
1047 {
1048         if (!dev->active)
1049                 return -EINVAL;
1050         isapnp_cfg_begin(dev->card->number, dev->number);
1051         isapnp_deactivate(dev->number);
1052         dev->active = 0;
1053         isapnp_cfg_end();
1054         return 0;
1055 }
1056
1057 struct pnp_protocol isapnp_protocol = {
1058         .name = "ISA Plug and Play",
1059         .get = isapnp_get_resources,
1060         .set = isapnp_set_resources,
1061         .disable = isapnp_disable_resources,
1062 };
1063
1064 static int __init isapnp_init(void)
1065 {
1066         int cards;
1067         struct pnp_card *card;
1068         struct pnp_dev *dev;
1069
1070         if (isapnp_disable) {
1071                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1072                 return 0;
1073         }
1074 #ifdef CONFIG_PPC_MERGE
1075         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1076                 return -EINVAL;
1077 #endif
1078 #ifdef ISAPNP_REGION_OK
1079         if (!request_region(_PIDXR, 1, "isapnp index")) {
1080                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1081                        _PIDXR);
1082                 return -EBUSY;
1083         }
1084 #endif
1085         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1086                 printk(KERN_ERR
1087                        "isapnp: Write Data Register 0x%x already used\n",
1088                        _PNPWRP);
1089 #ifdef ISAPNP_REGION_OK
1090                 release_region(_PIDXR, 1);
1091 #endif
1092                 return -EBUSY;
1093         }
1094
1095         if (pnp_register_protocol(&isapnp_protocol) < 0)
1096                 return -EBUSY;
1097
1098         /*
1099          *      Print a message. The existing ISAPnP code is hanging machines
1100          *      so let the user know where.
1101          */
1102
1103         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1104         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1105                 isapnp_rdp |= 3;
1106                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1107                         printk(KERN_ERR
1108                                "isapnp: Read Data Register 0x%x already used\n",
1109                                isapnp_rdp);
1110 #ifdef ISAPNP_REGION_OK
1111                         release_region(_PIDXR, 1);
1112 #endif
1113                         release_region(_PNPWRP, 1);
1114                         return -EBUSY;
1115                 }
1116                 isapnp_set_rdp();
1117         }
1118         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1119                 cards = isapnp_isolate();
1120                 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1121 #ifdef ISAPNP_REGION_OK
1122                         release_region(_PIDXR, 1);
1123 #endif
1124                         release_region(_PNPWRP, 1);
1125                         printk(KERN_INFO
1126                                "isapnp: No Plug & Play device found\n");
1127                         return 0;
1128                 }
1129                 request_region(isapnp_rdp, 1, "isapnp read");
1130         }
1131         isapnp_build_device_list();
1132         cards = 0;
1133
1134         protocol_for_each_card(&isapnp_protocol, card) {
1135                 cards++;
1136                 if (isapnp_verbose) {
1137                         printk(KERN_INFO "isapnp: Card '%s'\n",
1138                                card->name[0] ? card->name : "Unknown");
1139                         if (isapnp_verbose < 2)
1140                                 continue;
1141                         card_for_each_dev(card, dev) {
1142                                 printk(KERN_INFO "isapnp:   Device '%s'\n",
1143                                        dev->name[0] ? dev->name : "Unknown");
1144                         }
1145                 }
1146         }
1147         if (cards)
1148                 printk(KERN_INFO
1149                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1150                        cards > 1 ? "s" : "");
1151         else
1152                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1153
1154         isapnp_proc_init();
1155         return 0;
1156 }
1157
1158 device_initcall(isapnp_init);
1159
1160 /* format is: noisapnp */
1161
1162 static int __init isapnp_setup_disable(char *str)
1163 {
1164         isapnp_disable = 1;
1165         return 1;
1166 }
1167
1168 __setup("noisapnp", isapnp_setup_disable);
1169
1170 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1171
1172 static int __init isapnp_setup_isapnp(char *str)
1173 {
1174         (void)((get_option(&str, &isapnp_rdp) == 2) &&
1175                (get_option(&str, &isapnp_reset) == 2) &&
1176                (get_option(&str, &isapnp_verbose) == 2));
1177         return 1;
1178 }
1179
1180 __setup("isapnp=", isapnp_setup_isapnp);