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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 EISA id.
 402  */
 403 static void isapnp_parse_id(struct pnp_dev *dev, unsigned short vendor,
 404                             unsigned short device)
 405 {
 406         char id[8];
 407
 408         sprintf(id, "%c%c%c%x%x%x%x",
 409                 'A' + ((vendor >> 2) & 0x3f) - 1,
 410                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
 411                 'A' + ((vendor >> 8) & 0x1f) - 1,
 412                 (device >> 4) & 0x0f,
 413                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
 414
 415         pnp_add_id(dev, id);
 416 }
 417
 418 /*
 419  *  Parse logical device tag.
 420  */
 421 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card,
 422                                                   int size, int number)
 423 {
 424         unsigned char tmp[6];
 425         struct pnp_dev *dev;
 426
 427         isapnp_peek(tmp, size);
 428         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
 429         if (!dev)
 430                 return NULL;
 431         dev->number = number;
 432         isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0], (tmp[3] << 8) | tmp[2]);
 433         dev->regs = tmp[4];
 434         dev->card = card;
 435         if (size > 5)
 436                 dev->regs |= tmp[5] << 8;
 437         dev->protocol = &isapnp_protocol;
 438         dev->capabilities |= PNP_CONFIGURABLE;
 439         dev->capabilities |= PNP_READ;
 440         dev->capabilities |= PNP_WRITE;
 441         dev->capabilities |= PNP_DISABLE;
 442         pnp_init_resource_table(&dev->res);
 443         return dev;
 444 }
 445
 446 /*
 447  *  Add IRQ resource to resources list.
 448  */
 449 static void __init isapnp_parse_irq_resource(struct pnp_option *option,
 450                                              int size)
 451 {
 452         unsigned char tmp[3];
 453         struct pnp_irq *irq;
 454         unsigned long bits;
 455
 456         isapnp_peek(tmp, size);
 457         irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL);
 458         if (!irq)
 459                 return;
 460         bits = (tmp[1] << 8) | tmp[0];
 461         bitmap_copy(irq->map, &bits, 16);
 462         if (size > 2)
 463                 irq->flags = tmp[2];
 464         else
 465                 irq->flags = IORESOURCE_IRQ_HIGHEDGE;
 466         pnp_register_irq_resource(option, irq);
 467 }
 468
 469 /*
 470  *  Add DMA resource to resources list.
 471  */
 472 static void __init isapnp_parse_dma_resource(struct pnp_option *option,
 473                                              int size)
 474 {
 475         unsigned char tmp[2];
 476         struct pnp_dma *dma;
 477
 478         isapnp_peek(tmp, size);
 479         dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL);
 480         if (!dma)
 481                 return;
 482         dma->map = tmp[0];
 483         dma->flags = tmp[1];
 484         pnp_register_dma_resource(option, dma);
 485 }
 486
 487 /*
 488  *  Add port resource to resources list.
 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 = kzalloc(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 }
 507
 508 /*
 509  *  Add fixed port resource to resources list.
 510  */
 511 static void __init isapnp_parse_fixed_port_resource(struct pnp_option *option,
 512                                                     int size)
 513 {
 514         unsigned char tmp[3];
 515         struct pnp_port *port;
 516
 517         isapnp_peek(tmp, size);
 518         port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL);
 519         if (!port)
 520                 return;
 521         port->min = port->max = (tmp[1] << 8) | tmp[0];
 522         port->size = tmp[2];
 523         port->align = 0;
 524         port->flags = PNP_PORT_FLAG_FIXED;
 525         pnp_register_port_resource(option, port);
 526 }
 527
 528 /*
 529  *  Add memory resource to resources list.
 530  */
 531 static void __init isapnp_parse_mem_resource(struct pnp_option *option,
 532                                              int size)
 533 {
 534         unsigned char tmp[9];
 535         struct pnp_mem *mem;
 536
 537         isapnp_peek(tmp, size);
 538         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 539         if (!mem)
 540                 return;
 541         mem->min = ((tmp[2] << 8) | tmp[1]) << 8;
 542         mem->max = ((tmp[4] << 8) | tmp[3]) << 8;
 543         mem->align = (tmp[6] << 8) | tmp[5];
 544         mem->size = ((tmp[8] << 8) | tmp[7]) << 8;
 545         mem->flags = tmp[0];
 546         pnp_register_mem_resource(option, mem);
 547 }
 548
 549 /*
 550  *  Add 32-bit memory resource to resources list.
 551  */
 552 static void __init isapnp_parse_mem32_resource(struct pnp_option *option,
 553                                                int size)
 554 {
 555         unsigned char tmp[17];
 556         struct pnp_mem *mem;
 557
 558         isapnp_peek(tmp, size);
 559         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 560         if (!mem)
 561                 return;
 562         mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 563         mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 564         mem->align =
 565             (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9];
 566         mem->size =
 567             (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13];
 568         mem->flags = tmp[0];
 569         pnp_register_mem_resource(option, mem);
 570 }
 571
 572 /*
 573  *  Add 32-bit fixed memory resource to resources list.
 574  */
 575 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_option *option,
 576                                                      int size)
 577 {
 578         unsigned char tmp[9];
 579         struct pnp_mem *mem;
 580
 581         isapnp_peek(tmp, size);
 582         mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL);
 583         if (!mem)
 584                 return;
 585         mem->min = mem->max =
 586             (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1];
 587         mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5];
 588         mem->align = 0;
 589         mem->flags = tmp[0];
 590         pnp_register_mem_resource(option, mem);
 591 }
 592
 593 /*
 594  *  Parse card name for ISA PnP device.
 595  */
 596 static void __init
 597 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size)
 598 {
 599         if (name[0] == '\0') {
 600                 unsigned short size1 =
 601                     *size >= name_max ? (name_max - 1) : *size;
 602                 isapnp_peek(name, size1);
 603                 name[size1] = '\0';
 604                 *size -= size1;
 605
 606                 /* clean whitespace from end of string */
 607                 while (size1 > 0 && name[--size1] == ' ')
 608                         name[size1] = '\0';
 609         }
 610 }
 611
 612 /*
 613  *  Parse resource map for logical device.
 614  */
 615 static int __init isapnp_create_device(struct pnp_card *card,
 616                                        unsigned short size)
 617 {
 618         int number = 0, skip = 0, priority = 0, compat = 0;
 619         unsigned char type, tmp[17];
 620         struct pnp_option *option;
 621         struct pnp_dev *dev;
 622
 623         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
 624                 return 1;
 625         option = pnp_register_independent_option(dev);
 626         if (!option) {
 627                 kfree(dev);
 628                 return 1;
 629         }
 630         pnp_add_card_device(card, dev);
 631
 632         while (1) {
 633                 if (isapnp_read_tag(&type, &size) < 0)
 634                         return 1;
 635                 if (skip && type != _STAG_LOGDEVID && type != _STAG_END)
 636                         goto __skip;
 637                 switch (type) {
 638                 case _STAG_LOGDEVID:
 639                         if (size >= 5 && size <= 6) {
 640                                 if ((dev =
 641                                      isapnp_parse_device(card, size,
 642                                                          number++)) == NULL)
 643                                         return 1;
 644                                 size = 0;
 645                                 skip = 0;
 646                                 option = pnp_register_independent_option(dev);
 647                                 if (!option) {
 648                                         kfree(dev);
 649                                         return 1;
 650                                 }
 651                                 pnp_add_card_device(card, dev);
 652                         } else {
 653                                 skip = 1;
 654                         }
 655                         priority = 0;
 656                         compat = 0;
 657                         break;
 658                 case _STAG_COMPATDEVID:
 659                         if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) {
 660                                 isapnp_peek(tmp, 4);
 661                                 isapnp_parse_id(dev, (tmp[1] << 8) | tmp[0],
 662                                                 (tmp[3] << 8) | tmp[2]);
 663                                 compat++;
 664                                 size = 0;
 665                         }
 666                         break;
 667                 case _STAG_IRQ:
 668                         if (size < 2 || size > 3)
 669                                 goto __skip;
 670                         isapnp_parse_irq_resource(option, size);
 671                         size = 0;
 672                         break;
 673                 case _STAG_DMA:
 674                         if (size != 2)
 675                                 goto __skip;
 676                         isapnp_parse_dma_resource(option, size);
 677                         size = 0;
 678                         break;
 679                 case _STAG_STARTDEP:
 680                         if (size > 1)
 681                                 goto __skip;
 682                         priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE;
 683                         if (size > 0) {
 684                                 isapnp_peek(tmp, size);
 685                                 priority = 0x100 | tmp[0];
 686                                 size = 0;
 687                         }
 688                         option = pnp_register_dependent_option(dev, priority);
 689                         if (!option)
 690                                 return 1;
 691                         break;
 692                 case _STAG_ENDDEP:
 693                         if (size != 0)
 694                                 goto __skip;
 695                         priority = 0;
 696                         break;
 697                 case _STAG_IOPORT:
 698                         if (size != 7)
 699                                 goto __skip;
 700                         isapnp_parse_port_resource(option, size);
 701                         size = 0;
 702                         break;
 703                 case _STAG_FIXEDIO:
 704                         if (size != 3)
 705                                 goto __skip;
 706                         isapnp_parse_fixed_port_resource(option, size);
 707                         size = 0;
 708                         break;
 709                 case _STAG_VENDOR:
 710                         break;
 711                 case _LTAG_MEMRANGE:
 712                         if (size != 9)
 713                                 goto __skip;
 714                         isapnp_parse_mem_resource(option, size);
 715                         size = 0;
 716                         break;
 717                 case _LTAG_ANSISTR:
 718                         isapnp_parse_name(dev->name, sizeof(dev->name), &size);
 719                         break;
 720                 case _LTAG_UNICODESTR:
 721                         /* silently ignore */
 722                         /* who use unicode for hardware identification? */
 723                         break;
 724                 case _LTAG_VENDOR:
 725                         break;
 726                 case _LTAG_MEM32RANGE:
 727                         if (size != 17)
 728                                 goto __skip;
 729                         isapnp_parse_mem32_resource(option, size);
 730                         size = 0;
 731                         break;
 732                 case _LTAG_FIXEDMEM32RANGE:
 733                         if (size != 9)
 734                                 goto __skip;
 735                         isapnp_parse_fixed_mem32_resource(option, size);
 736                         size = 0;
 737                         break;
 738                 case _STAG_END:
 739                         if (size > 0)
 740                                 isapnp_skip_bytes(size);
 741                         return 1;
 742                 default:
 743                         printk(KERN_ERR
 744                                "isapnp: unexpected or unknown tag type 0x%x for logical device %i (device %i), ignored\n",
 745                                type, dev->number, card->number);
 746                 }
 747 __skip:
 748                 if (size > 0)
 749                         isapnp_skip_bytes(size);
 750         }
 751         return 0;
 752 }
 753
 754 /*
 755  *  Parse resource map for ISA PnP card.
 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),
 785                                           &size);
 786                         break;
 787                 case _LTAG_UNICODESTR:
 788                         /* silently ignore */
 789                         /* who use unicode for hardware identification? */
 790                         break;
 791                 case _LTAG_VENDOR:
 792                         break;
 793                 case _STAG_END:
 794                         if (size > 0)
 795                                 isapnp_skip_bytes(size);
 796                         return;
 797                 default:
 798                         printk(KERN_ERR
 799                                "isapnp: unexpected or unknown tag type 0x%x for device %i, ignored\n",
 800                                type, card->number);
 801                 }
 802 __skip:
 803                 if (size > 0)
 804                         isapnp_skip_bytes(size);
 805         }
 806 }
 807
 808 /*
 809  *  Compute ISA PnP checksum for first eight bytes.
 810  */
 811 static unsigned char __init isapnp_checksum(unsigned char *data)
 812 {
 813         int i, j;
 814         unsigned char checksum = 0x6a, bit, b;
 815
 816         for (i = 0; i < 8; i++) {
 817                 b = data[i];
 818                 for (j = 0; j < 8; j++) {
 819                         bit = 0;
 820                         if (b & (1 << j))
 821                                 bit = 1;
 822                         checksum =
 823                             ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7)
 824                             | (checksum >> 1);
 825                 }
 826         }
 827         return checksum;
 828 }
 829
 830 /*
 831  *  Parse EISA id for ISA PnP card.
 832  */
 833 static void isapnp_parse_card_id(struct pnp_card *card, unsigned short vendor,
 834                                  unsigned short device)
 835 {
 836         struct pnp_id *id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
 837
 838         if (!id)
 839                 return;
 840         sprintf(id->id, "%c%c%c%x%x%x%x",
 841                 'A' + ((vendor >> 2) & 0x3f) - 1,
 842                 'A' + (((vendor & 3) << 3) | ((vendor >> 13) & 7)) - 1,
 843                 'A' + ((vendor >> 8) & 0x1f) - 1,
 844                 (device >> 4) & 0x0f,
 845                 device & 0x0f, (device >> 12) & 0x0f, (device >> 8) & 0x0f);
 846         pnp_add_card_id(id, card);
 847 }
 848
 849 /*
 850  *  Build device list for all present ISA PnP devices.
 851  */
 852 static int __init isapnp_build_device_list(void)
 853 {
 854         int csn;
 855         unsigned char header[9], checksum;
 856         struct pnp_card *card;
 857
 858         isapnp_wait();
 859         isapnp_key();
 860         for (csn = 1; csn <= isapnp_csn_count; csn++) {
 861                 isapnp_wake(csn);
 862                 isapnp_peek(header, 9);
 863                 checksum = isapnp_checksum(header);
 864 #if 0
 865                 printk(KERN_DEBUG
 866                        "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
 867                        header[0], header[1], header[2], header[3], header[4],
 868                        header[5], header[6], header[7], header[8]);
 869                 printk(KERN_DEBUG "checksum = 0x%x\n", checksum);
 870 #endif
 871                 if ((card =
 872                      kzalloc(sizeof(struct pnp_card), GFP_KERNEL)) == NULL)
 873                         continue;
 874
 875                 card->number = csn;
 876                 INIT_LIST_HEAD(&card->devices);
 877                 isapnp_parse_card_id(card, (header[1] << 8) | header[0],
 878                                      (header[3] << 8) | header[2]);
 879                 card->serial =
 880                     (header[7] << 24) | (header[6] << 16) | (header[5] << 8) |
 881                     header[4];
 882                 isapnp_checksum_value = 0x00;
 883                 isapnp_parse_resource_map(card);
 884                 if (isapnp_checksum_value != 0x00)
 885                         printk(KERN_ERR
 886                                "isapnp: checksum for device %i is not valid (0x%x)\n",
 887                                csn, isapnp_checksum_value);
 888                 card->checksum = isapnp_checksum_value;
 889                 card->protocol = &isapnp_protocol;
 890
 891                 pnp_add_card(card);
 892         }
 893         isapnp_wait();
 894         return 0;
 895 }
 896
 897 /*
 898  *  Basic configuration routines.
 899  */
 900
 901 int isapnp_present(void)
 902 {
 903         struct pnp_card *card;
 904
 905         pnp_for_each_card(card) {
 906                 if (card->protocol == &isapnp_protocol)
 907                         return 1;
 908         }
 909         return 0;
 910 }
 911
 912 int isapnp_cfg_begin(int csn, int logdev)
 913 {
 914         if (csn < 1 || csn > isapnp_csn_count || logdev > 10)
 915                 return -EINVAL;
 916         mutex_lock(&isapnp_cfg_mutex);
 917         isapnp_wait();
 918         isapnp_key();
 919         isapnp_wake(csn);
 920 #if 0
 921         /* to avoid malfunction when the isapnptools package is used */
 922         /* we must set RDP to our value again */
 923         /* it is possible to set RDP only in the isolation phase */
 924         /*   Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */
 925         isapnp_write_byte(0x02, 0x04);  /* clear CSN of card */
 926         mdelay(2);              /* is this necessary? */
 927         isapnp_wake(csn);       /* bring card into sleep state */
 928         isapnp_wake(0);         /* bring card into isolation state */
 929         isapnp_set_rdp();       /* reset the RDP port */
 930         udelay(1000);           /* delay 1000us */
 931         isapnp_write_byte(0x06, csn);   /* reset CSN to previous value */
 932         udelay(250);            /* is this necessary? */
 933 #endif
 934         if (logdev >= 0)
 935                 isapnp_device(logdev);
 936         return 0;
 937 }
 938
 939 int isapnp_cfg_end(void)
 940 {
 941         isapnp_wait();
 942         mutex_unlock(&isapnp_cfg_mutex);
 943         return 0;
 944 }
 945
 946 /*
 947  *  Initialization.
 948  */
 949
 950 EXPORT_SYMBOL(isapnp_protocol);
 951 EXPORT_SYMBOL(isapnp_present);
 952 EXPORT_SYMBOL(isapnp_cfg_begin);
 953 EXPORT_SYMBOL(isapnp_cfg_end);
 954 EXPORT_SYMBOL(isapnp_write_byte);
 955
 956 static int isapnp_read_resources(struct pnp_dev *dev,
 957                                  struct pnp_resource_table *res)
 958 {
 959         int tmp, ret;
 960
 961         dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE);
 962         if (dev->active) {
 963                 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) {
 964                         ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1));
 965                         if (!ret)
 966                                 continue;
 967                         res->port_resource[tmp].start = ret;
 968                         res->port_resource[tmp].flags = IORESOURCE_IO;
 969                 }
 970                 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) {
 971                         ret =
 972                             isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8;
 973                         if (!ret)
 974                                 continue;
 975                         res->mem_resource[tmp].start = ret;
 976                         res->mem_resource[tmp].flags = IORESOURCE_MEM;
 977                 }
 978                 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) {
 979                         ret =
 980                             (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >>
 981                              8);
 982                         if (!ret)
 983                                 continue;
 984                         res->irq_resource[tmp].start =
 985                             res->irq_resource[tmp].end = ret;
 986                         res->irq_resource[tmp].flags = IORESOURCE_IRQ;
 987                 }
 988                 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) {
 989                         ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp);
 990                         if (ret == 4)
 991                                 continue;
 992                         res->dma_resource[tmp].start =
 993                             res->dma_resource[tmp].end = ret;
 994                         res->dma_resource[tmp].flags = IORESOURCE_DMA;
 995                 }
 996         }
 997         return 0;
 998 }
 999
1000 static int isapnp_get_resources(struct pnp_dev *dev,
1001                                 struct pnp_resource_table *res)
1002 {
1003         int ret;
1004
1005         pnp_init_resource_table(res);
1006         isapnp_cfg_begin(dev->card->number, dev->number);
1007         ret = isapnp_read_resources(dev, res);
1008         isapnp_cfg_end();
1009         return ret;
1010 }
1011
1012 static int isapnp_set_resources(struct pnp_dev *dev,
1013                                 struct pnp_resource_table *res)
1014 {
1015         int tmp;
1016
1017         isapnp_cfg_begin(dev->card->number, dev->number);
1018         dev->active = 1;
1019         for (tmp = 0;
1020              tmp < ISAPNP_MAX_PORT
1021              && (res->port_resource[tmp].
1022                  flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO;
1023              tmp++)
1024                 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1),
1025                                   res->port_resource[tmp].start);
1026         for (tmp = 0;
1027              tmp < ISAPNP_MAX_IRQ
1028              && (res->irq_resource[tmp].
1029                  flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ;
1030              tmp++) {
1031                 int irq = res->irq_resource[tmp].start;
1032                 if (irq == 2)
1033                         irq = 9;
1034                 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq);
1035         }
1036         for (tmp = 0;
1037              tmp < ISAPNP_MAX_DMA
1038              && (res->dma_resource[tmp].
1039                  flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA;
1040              tmp++)
1041                 isapnp_write_byte(ISAPNP_CFG_DMA + tmp,
1042                                   res->dma_resource[tmp].start);
1043         for (tmp = 0;
1044              tmp < ISAPNP_MAX_MEM
1045              && (res->mem_resource[tmp].
1046                  flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM;
1047              tmp++)
1048                 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3),
1049                                   (res->mem_resource[tmp].start >> 8) & 0xffff);
1050         /* FIXME: We aren't handling 32bit mems properly here */
1051         isapnp_activate(dev->number);
1052         isapnp_cfg_end();
1053         return 0;
1054 }
1055
1056 static int isapnp_disable_resources(struct pnp_dev *dev)
1057 {
1058         if (!dev->active)
1059                 return -EINVAL;
1060         isapnp_cfg_begin(dev->card->number, dev->number);
1061         isapnp_deactivate(dev->number);
1062         dev->active = 0;
1063         isapnp_cfg_end();
1064         return 0;
1065 }
1066
1067 struct pnp_protocol isapnp_protocol = {
1068         .name = "ISA Plug and Play",
1069         .get = isapnp_get_resources,
1070         .set = isapnp_set_resources,
1071         .disable = isapnp_disable_resources,
1072 };
1073
1074 static int __init isapnp_init(void)
1075 {
1076         int cards;
1077         struct pnp_card *card;
1078         struct pnp_dev *dev;
1079
1080         if (isapnp_disable) {
1081                 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n");
1082                 return 0;
1083         }
1084 #ifdef CONFIG_PPC_MERGE
1085         if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP))
1086                 return -EINVAL;
1087 #endif
1088 #ifdef ISAPNP_REGION_OK
1089         if (!request_region(_PIDXR, 1, "isapnp index")) {
1090                 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n",
1091                        _PIDXR);
1092                 return -EBUSY;
1093         }
1094 #endif
1095         if (!request_region(_PNPWRP, 1, "isapnp write")) {
1096                 printk(KERN_ERR
1097                        "isapnp: Write Data Register 0x%x already used\n",
1098                        _PNPWRP);
1099 #ifdef ISAPNP_REGION_OK
1100                 release_region(_PIDXR, 1);
1101 #endif
1102                 return -EBUSY;
1103         }
1104
1105         if (pnp_register_protocol(&isapnp_protocol) < 0)
1106                 return -EBUSY;
1107
1108         /*
1109          *      Print a message. The existing ISAPnP code is hanging machines
1110          *      so let the user know where.
1111          */
1112
1113         printk(KERN_INFO "isapnp: Scanning for PnP cards...\n");
1114         if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) {
1115                 isapnp_rdp |= 3;
1116                 if (!request_region(isapnp_rdp, 1, "isapnp read")) {
1117                         printk(KERN_ERR
1118                                "isapnp: Read Data Register 0x%x already used\n",
1119                                isapnp_rdp);
1120 #ifdef ISAPNP_REGION_OK
1121                         release_region(_PIDXR, 1);
1122 #endif
1123                         release_region(_PNPWRP, 1);
1124                         return -EBUSY;
1125                 }
1126                 isapnp_set_rdp();
1127         }
1128         if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) {
1129                 cards = isapnp_isolate();
1130                 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) {
1131 #ifdef ISAPNP_REGION_OK
1132                         release_region(_PIDXR, 1);
1133 #endif
1134                         release_region(_PNPWRP, 1);
1135                         printk(KERN_INFO
1136                                "isapnp: No Plug & Play device found\n");
1137                         return 0;
1138                 }
1139                 request_region(isapnp_rdp, 1, "isapnp read");
1140         }
1141         isapnp_build_device_list();
1142         cards = 0;
1143
1144         protocol_for_each_card(&isapnp_protocol, card) {
1145                 cards++;
1146                 if (isapnp_verbose) {
1147                         printk(KERN_INFO "isapnp: Card '%s'\n",
1148                                card->name[0] ? card->name : "Unknown");
1149                         if (isapnp_verbose < 2)
1150                                 continue;
1151                         card_for_each_dev(card, dev) {
1152                                 printk(KERN_INFO "isapnp:   Device '%s'\n",
1153                                        dev->name[0] ? dev->name : "Unknown");
1154                         }
1155                 }
1156         }
1157         if (cards)
1158                 printk(KERN_INFO
1159                        "isapnp: %i Plug & Play card%s detected total\n", cards,
1160                        cards > 1 ? "s" : "");
1161         else
1162                 printk(KERN_INFO "isapnp: No Plug & Play card found\n");
1163
1164         isapnp_proc_init();
1165         return 0;
1166 }
1167
1168 device_initcall(isapnp_init);
1169
1170 /* format is: noisapnp */
1171
1172 static int __init isapnp_setup_disable(char *str)
1173 {
1174         isapnp_disable = 1;
1175         return 1;
1176 }
1177
1178 __setup("noisapnp", isapnp_setup_disable);
1179
1180 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */
1181
1182 static int __init isapnp_setup_isapnp(char *str)
1183 {
1184         (void)((get_option(&str, &isapnp_rdp) == 2) &&
1185                (get_option(&str, &isapnp_reset) == 2) &&
1186                (get_option(&str, &isapnp_verbose) == 2));
1187         return 1;
1188 }
1189
1190 __setup("isapnp=", isapnp_setup_isapnp);