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->card = card; 420 dev->capabilities |= PNP_CONFIGURABLE; 421 dev->capabilities |= PNP_READ; 422 dev->capabilities |= PNP_WRITE; 423 dev->capabilities |= PNP_DISABLE; 424 pnp_init_resources(dev); 425 return dev; 426 } 427 428 /* 429 * Add IRQ resource to resources list. 430 */ 431 static void __init isapnp_parse_irq_resource(struct pnp_dev *dev, 432 unsigned int option_flags, 433 int size) 434 { 435 unsigned char tmp[3]; 436 unsigned long bits; 437 pnp_irq_mask_t map; 438 unsigned char flags = IORESOURCE_IRQ_HIGHEDGE; 439 440 isapnp_peek(tmp, size); 441 bits = (tmp[1] << 8) | tmp[0]; 442 443 bitmap_zero(map.bits, PNP_IRQ_NR); 444 bitmap_copy(map.bits, &bits, 16); 445 446 if (size > 2) 447 flags = tmp[2]; 448 449 pnp_register_irq_resource(dev, option_flags, &map, flags); 450 } 451 452 /* 453 * Add DMA resource to resources list. 454 */ 455 static void __init isapnp_parse_dma_resource(struct pnp_dev *dev, 456 unsigned int option_flags, 457 int size) 458 { 459 unsigned char tmp[2]; 460 461 isapnp_peek(tmp, size); 462 pnp_register_dma_resource(dev, option_flags, tmp[0], tmp[1]); 463 } 464 465 /* 466 * Add port resource to resources list. 467 */ 468 static void __init isapnp_parse_port_resource(struct pnp_dev *dev, 469 unsigned int option_flags, 470 int size) 471 { 472 unsigned char tmp[7]; 473 resource_size_t min, max, align, len; 474 unsigned char flags; 475 476 isapnp_peek(tmp, size); 477 min = (tmp[2] << 8) | tmp[1]; 478 max = (tmp[4] << 8) | tmp[3]; 479 align = tmp[5]; 480 len = tmp[6]; 481 flags = tmp[0] ? IORESOURCE_IO_16BIT_ADDR : 0; 482 pnp_register_port_resource(dev, option_flags, 483 min, max, align, len, flags); 484 } 485 486 /* 487 * Add fixed port resource to resources list. 488 */ 489 static void __init isapnp_parse_fixed_port_resource(struct pnp_dev *dev, 490 unsigned int option_flags, 491 int size) 492 { 493 unsigned char tmp[3]; 494 resource_size_t base, len; 495 496 isapnp_peek(tmp, size); 497 base = (tmp[1] << 8) | tmp[0]; 498 len = tmp[2]; 499 pnp_register_port_resource(dev, option_flags, base, base, 0, len, 500 IORESOURCE_IO_FIXED); 501 } 502 503 /* 504 * Add memory resource to resources list. 505 */ 506 static void __init isapnp_parse_mem_resource(struct pnp_dev *dev, 507 unsigned int option_flags, 508 int size) 509 { 510 unsigned char tmp[9]; 511 resource_size_t min, max, align, len; 512 unsigned char flags; 513 514 isapnp_peek(tmp, size); 515 min = ((tmp[2] << 8) | tmp[1]) << 8; 516 max = ((tmp[4] << 8) | tmp[3]) << 8; 517 align = (tmp[6] << 8) | tmp[5]; 518 len = ((tmp[8] << 8) | tmp[7]) << 8; 519 flags = tmp[0]; 520 pnp_register_mem_resource(dev, option_flags, 521 min, max, align, len, flags); 522 } 523 524 /* 525 * Add 32-bit memory resource to resources list. 526 */ 527 static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev, 528 unsigned int option_flags, 529 int size) 530 { 531 unsigned char tmp[17]; 532 resource_size_t min, max, align, len; 533 unsigned char flags; 534 535 isapnp_peek(tmp, size); 536 min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 537 max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 538 align = (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9]; 539 len = (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13]; 540 flags = tmp[0]; 541 pnp_register_mem_resource(dev, option_flags, 542 min, max, align, len, flags); 543 } 544 545 /* 546 * Add 32-bit fixed memory resource to resources list. 547 */ 548 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev, 549 unsigned int option_flags, 550 int size) 551 { 552 unsigned char tmp[9]; 553 resource_size_t base, len; 554 unsigned char flags; 555 556 isapnp_peek(tmp, size); 557 base = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 558 len = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 559 flags = tmp[0]; 560 pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags); 561 } 562 563 /* 564 * Parse card name for ISA PnP device. 565 */ 566 static void __init 567 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size) 568 { 569 if (name[0] == '\0') { 570 unsigned short size1 = 571 *size >= name_max ? (name_max - 1) : *size; 572 isapnp_peek(name, size1); 573 name[size1] = '\0'; 574 *size -= size1; 575 576 /* clean whitespace from end of string */ 577 while (size1 > 0 && name[--size1] == ' ') 578 name[size1] = '\0'; 579 } 580 } 581 582 /* 583 * Parse resource map for logical device. 584 */ 585 static int __init isapnp_create_device(struct pnp_card *card, 586 unsigned short size) 587 { 588 int number = 0, skip = 0, priority, compat = 0; 589 unsigned char type, tmp[17]; 590 unsigned int option_flags; 591 struct pnp_dev *dev; 592 u32 eisa_id; 593 char id[8]; 594 595 if ((dev = isapnp_parse_device(card, size, number++)) == NULL) 596 return 1; 597 option_flags = 0; 598 pnp_add_card_device(card, dev); 599 600 while (1) { 601 if (isapnp_read_tag(&type, &size) < 0) 602 return 1; 603 if (skip && type != _STAG_LOGDEVID && type != _STAG_END) 604 goto __skip; 605 switch (type) { 606 case _STAG_LOGDEVID: 607 if (size >= 5 && size <= 6) { 608 if ((dev = 609 isapnp_parse_device(card, size, 610 number++)) == NULL) 611 return 1; 612 size = 0; 613 skip = 0; 614 option_flags = 0; 615 pnp_add_card_device(card, dev); 616 } else { 617 skip = 1; 618 } 619 compat = 0; 620 break; 621 case _STAG_COMPATDEVID: 622 if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) { 623 isapnp_peek(tmp, 4); 624 eisa_id = tmp[0] | tmp[1] << 8 | 625 tmp[2] << 16 | tmp[3] << 24; 626 pnp_eisa_id_to_string(eisa_id, id); 627 pnp_add_id(dev, id); 628 compat++; 629 size = 0; 630 } 631 break; 632 case _STAG_IRQ: 633 if (size < 2 || size > 3) 634 goto __skip; 635 isapnp_parse_irq_resource(dev, option_flags, size); 636 size = 0; 637 break; 638 case _STAG_DMA: 639 if (size != 2) 640 goto __skip; 641 isapnp_parse_dma_resource(dev, option_flags, size); 642 size = 0; 643 break; 644 case _STAG_STARTDEP: 645 if (size > 1) 646 goto __skip; 647 priority = PNP_RES_PRIORITY_ACCEPTABLE; 648 if (size > 0) { 649 isapnp_peek(tmp, size); 650 priority = tmp[0]; 651 size = 0; 652 } 653 option_flags = pnp_new_dependent_set(dev, priority); 654 break; 655 case _STAG_ENDDEP: 656 if (size != 0) 657 goto __skip; 658 option_flags = 0; 659 break; 660 case _STAG_IOPORT: 661 if (size != 7) 662 goto __skip; 663 isapnp_parse_port_resource(dev, option_flags, size); 664 size = 0; 665 break; 666 case _STAG_FIXEDIO: 667 if (size != 3) 668 goto __skip; 669 isapnp_parse_fixed_port_resource(dev, option_flags, 670 size); 671 size = 0; 672 break; 673 case _STAG_VENDOR: 674 break; 675 case _LTAG_MEMRANGE: 676 if (size != 9) 677 goto __skip; 678 isapnp_parse_mem_resource(dev, option_flags, size); 679 size = 0; 680 break; 681 case _LTAG_ANSISTR: 682 isapnp_parse_name(dev->name, sizeof(dev->name), &size); 683 break; 684 case _LTAG_UNICODESTR: 685 /* silently ignore */ 686 /* who use unicode for hardware identification? */ 687 break; 688 case _LTAG_VENDOR: 689 break; 690 case _LTAG_MEM32RANGE: 691 if (size != 17) 692 goto __skip; 693 isapnp_parse_mem32_resource(dev, option_flags, size); 694 size = 0; 695 break; 696 case _LTAG_FIXEDMEM32RANGE: 697 if (size != 9) 698 goto __skip; 699 isapnp_parse_fixed_mem32_resource(dev, option_flags, 700 size); 701 size = 0; 702 break; 703 case _STAG_END: 704 if (size > 0) 705 isapnp_skip_bytes(size); 706 return 1; 707 default: 708 dev_err(&dev->dev, "unknown tag %#x (card %i), " 709 "ignored\n", type, card->number); 710 } 711 __skip: 712 if (size > 0) 713 isapnp_skip_bytes(size); 714 } 715 return 0; 716 } 717 718 /* 719 * Parse resource map for ISA PnP card. 720 */ 721 static void __init isapnp_parse_resource_map(struct pnp_card *card) 722 { 723 unsigned char type, tmp[17]; 724 unsigned short size; 725 726 while (1) { 727 if (isapnp_read_tag(&type, &size) < 0) 728 return; 729 switch (type) { 730 case _STAG_PNPVERNO: 731 if (size != 2) 732 goto __skip; 733 isapnp_peek(tmp, 2); 734 card->pnpver = tmp[0]; 735 card->productver = tmp[1]; 736 size = 0; 737 break; 738 case _STAG_LOGDEVID: 739 if (size >= 5 && size <= 6) { 740 if (isapnp_create_device(card, size) == 1) 741 return; 742 size = 0; 743 } 744 break; 745 case _STAG_VENDOR: 746 break; 747 case _LTAG_ANSISTR: 748 isapnp_parse_name(card->name, sizeof(card->name), 749 &size); 750 break; 751 case _LTAG_UNICODESTR: 752 /* silently ignore */ 753 /* who use unicode for hardware identification? */ 754 break; 755 case _LTAG_VENDOR: 756 break; 757 case _STAG_END: 758 if (size > 0) 759 isapnp_skip_bytes(size); 760 return; 761 default: 762 dev_err(&card->dev, "unknown tag %#x, ignored\n", 763 type); 764 } 765 __skip: 766 if (size > 0) 767 isapnp_skip_bytes(size); 768 } 769 } 770 771 /* 772 * Compute ISA PnP checksum for first eight bytes. 773 */ 774 static unsigned char __init isapnp_checksum(unsigned char *data) 775 { 776 int i, j; 777 unsigned char checksum = 0x6a, bit, b; 778 779 for (i = 0; i < 8; i++) { 780 b = data[i]; 781 for (j = 0; j < 8; j++) { 782 bit = 0; 783 if (b & (1 << j)) 784 bit = 1; 785 checksum = 786 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) 787 | (checksum >> 1); 788 } 789 } 790 return checksum; 791 } 792 793 /* 794 * Build device list for all present ISA PnP devices. 795 */ 796 static int __init isapnp_build_device_list(void) 797 { 798 int csn; 799 unsigned char header[9], checksum; 800 struct pnp_card *card; 801 u32 eisa_id; 802 char id[8]; 803 804 isapnp_wait(); 805 isapnp_key(); 806 for (csn = 1; csn <= isapnp_csn_count; csn++) { 807 isapnp_wake(csn); 808 isapnp_peek(header, 9); 809 checksum = isapnp_checksum(header); 810 eisa_id = header[0] | header[1] << 8 | 811 header[2] << 16 | header[3] << 24; 812 pnp_eisa_id_to_string(eisa_id, id); 813 card = pnp_alloc_card(&isapnp_protocol, csn, id); 814 if (!card) 815 continue; 816 817 #if 0 818 dev_info(&card->dev, 819 "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 820 header[0], header[1], header[2], header[3], header[4], 821 header[5], header[6], header[7], header[8]); 822 dev_info(&card->dev, "checksum = %#x\n", checksum); 823 #endif 824 INIT_LIST_HEAD(&card->devices); 825 card->serial = 826 (header[7] << 24) | (header[6] << 16) | (header[5] << 8) | 827 header[4]; 828 isapnp_checksum_value = 0x00; 829 isapnp_parse_resource_map(card); 830 if (isapnp_checksum_value != 0x00) 831 dev_err(&card->dev, "invalid checksum %#x\n", 832 isapnp_checksum_value); 833 card->checksum = isapnp_checksum_value; 834 835 pnp_add_card(card); 836 } 837 isapnp_wait(); 838 return 0; 839 } 840 841 /* 842 * Basic configuration routines. 843 */ 844 845 int isapnp_present(void) 846 { 847 struct pnp_card *card; 848 849 pnp_for_each_card(card) { 850 if (card->protocol == &isapnp_protocol) 851 return 1; 852 } 853 return 0; 854 } 855 856 int isapnp_cfg_begin(int csn, int logdev) 857 { 858 if (csn < 1 || csn > isapnp_csn_count || logdev > 10) 859 return -EINVAL; 860 mutex_lock(&isapnp_cfg_mutex); 861 isapnp_wait(); 862 isapnp_key(); 863 isapnp_wake(csn); 864 #if 0 865 /* to avoid malfunction when the isapnptools package is used */ 866 /* we must set RDP to our value again */ 867 /* it is possible to set RDP only in the isolation phase */ 868 /* Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */ 869 isapnp_write_byte(0x02, 0x04); /* clear CSN of card */ 870 mdelay(2); /* is this necessary? */ 871 isapnp_wake(csn); /* bring card into sleep state */ 872 isapnp_wake(0); /* bring card into isolation state */ 873 isapnp_set_rdp(); /* reset the RDP port */ 874 udelay(1000); /* delay 1000us */ 875 isapnp_write_byte(0x06, csn); /* reset CSN to previous value */ 876 udelay(250); /* is this necessary? */ 877 #endif 878 if (logdev >= 0) 879 isapnp_device(logdev); 880 return 0; 881 } 882 883 int isapnp_cfg_end(void) 884 { 885 isapnp_wait(); 886 mutex_unlock(&isapnp_cfg_mutex); 887 return 0; 888 } 889 890 /* 891 * Initialization. 892 */ 893 894 EXPORT_SYMBOL(isapnp_protocol); 895 EXPORT_SYMBOL(isapnp_present); 896 EXPORT_SYMBOL(isapnp_cfg_begin); 897 EXPORT_SYMBOL(isapnp_cfg_end); 898 EXPORT_SYMBOL(isapnp_write_byte); 899 900 static int isapnp_get_resources(struct pnp_dev *dev) 901 { 902 int i, ret; 903 904 dev_dbg(&dev->dev, "get resources\n"); 905 pnp_init_resources(dev); 906 isapnp_cfg_begin(dev->card->number, dev->number); 907 dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE); 908 if (!dev->active) 909 goto __end; 910 911 for (i = 0; i < ISAPNP_MAX_PORT; i++) { 912 ret = isapnp_read_word(ISAPNP_CFG_PORT + (i << 1)); 913 pnp_add_io_resource(dev, ret, ret, 914 ret == 0 ? IORESOURCE_DISABLED : 0); 915 } 916 for (i = 0; i < ISAPNP_MAX_MEM; i++) { 917 ret = isapnp_read_word(ISAPNP_CFG_MEM + (i << 3)) << 8; 918 pnp_add_mem_resource(dev, ret, ret, 919 ret == 0 ? IORESOURCE_DISABLED : 0); 920 } 921 for (i = 0; i < ISAPNP_MAX_IRQ; i++) { 922 ret = isapnp_read_word(ISAPNP_CFG_IRQ + (i << 1)) >> 8; 923 pnp_add_irq_resource(dev, ret, 924 ret == 0 ? IORESOURCE_DISABLED : 0); 925 } 926 for (i = 0; i < ISAPNP_MAX_DMA; i++) { 927 ret = isapnp_read_byte(ISAPNP_CFG_DMA + i); 928 pnp_add_dma_resource(dev, ret, 929 ret == 4 ? IORESOURCE_DISABLED : 0); 930 } 931 932 __end: 933 isapnp_cfg_end(); 934 return 0; 935 } 936 937 static int isapnp_set_resources(struct pnp_dev *dev) 938 { 939 struct resource *res; 940 int tmp; 941 942 dev_dbg(&dev->dev, "set resources\n"); 943 isapnp_cfg_begin(dev->card->number, dev->number); 944 dev->active = 1; 945 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) { 946 res = pnp_get_resource(dev, IORESOURCE_IO, tmp); 947 if (pnp_resource_enabled(res)) { 948 dev_dbg(&dev->dev, " set io %d to %#llx\n", 949 tmp, (unsigned long long) res->start); 950 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1), 951 res->start); 952 } 953 } 954 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) { 955 res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp); 956 if (pnp_resource_enabled(res)) { 957 int irq = res->start; 958 if (irq == 2) 959 irq = 9; 960 dev_dbg(&dev->dev, " set irq %d to %d\n", tmp, irq); 961 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq); 962 } 963 } 964 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) { 965 res = pnp_get_resource(dev, IORESOURCE_DMA, tmp); 966 if (pnp_resource_enabled(res)) { 967 dev_dbg(&dev->dev, " set dma %d to %lld\n", 968 tmp, (unsigned long long) res->start); 969 isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start); 970 } 971 } 972 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) { 973 res = pnp_get_resource(dev, IORESOURCE_MEM, tmp); 974 if (pnp_resource_enabled(res)) { 975 dev_dbg(&dev->dev, " set mem %d to %#llx\n", 976 tmp, (unsigned long long) res->start); 977 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3), 978 (res->start >> 8) & 0xffff); 979 } 980 } 981 /* FIXME: We aren't handling 32bit mems properly here */ 982 isapnp_activate(dev->number); 983 isapnp_cfg_end(); 984 return 0; 985 } 986 987 static int isapnp_disable_resources(struct pnp_dev *dev) 988 { 989 if (!dev->active) 990 return -EINVAL; 991 isapnp_cfg_begin(dev->card->number, dev->number); 992 isapnp_deactivate(dev->number); 993 dev->active = 0; 994 isapnp_cfg_end(); 995 return 0; 996 } 997 998 struct pnp_protocol isapnp_protocol = { 999 .name = "ISA Plug and Play", 1000 .get = isapnp_get_resources, 1001 .set = isapnp_set_resources, 1002 .disable = isapnp_disable_resources, 1003 }; 1004 1005 static int __init isapnp_init(void) 1006 { 1007 int cards; 1008 struct pnp_card *card; 1009 struct pnp_dev *dev; 1010 1011 if (isapnp_disable) { 1012 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n"); 1013 return 0; 1014 } 1015 #ifdef CONFIG_PPC 1016 if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP)) 1017 return -EINVAL; 1018 #endif 1019 #ifdef ISAPNP_REGION_OK 1020 if (!request_region(_PIDXR, 1, "isapnp index")) { 1021 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n", 1022 _PIDXR); 1023 return -EBUSY; 1024 } 1025 #endif 1026 if (!request_region(_PNPWRP, 1, "isapnp write")) { 1027 printk(KERN_ERR 1028 "isapnp: Write Data Register 0x%x already used\n", 1029 _PNPWRP); 1030 #ifdef ISAPNP_REGION_OK 1031 release_region(_PIDXR, 1); 1032 #endif 1033 return -EBUSY; 1034 } 1035 1036 if (pnp_register_protocol(&isapnp_protocol) < 0) 1037 return -EBUSY; 1038 1039 /* 1040 * Print a message. The existing ISAPnP code is hanging machines 1041 * so let the user know where. 1042 */ 1043 1044 printk(KERN_INFO "isapnp: Scanning for PnP cards...\n"); 1045 if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) { 1046 isapnp_rdp |= 3; 1047 if (!request_region(isapnp_rdp, 1, "isapnp read")) { 1048 printk(KERN_ERR 1049 "isapnp: Read Data Register 0x%x already used\n", 1050 isapnp_rdp); 1051 #ifdef ISAPNP_REGION_OK 1052 release_region(_PIDXR, 1); 1053 #endif 1054 release_region(_PNPWRP, 1); 1055 return -EBUSY; 1056 } 1057 isapnp_set_rdp(); 1058 } 1059 if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) { 1060 cards = isapnp_isolate(); 1061 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) { 1062 #ifdef ISAPNP_REGION_OK 1063 release_region(_PIDXR, 1); 1064 #endif 1065 release_region(_PNPWRP, 1); 1066 printk(KERN_INFO 1067 "isapnp: No Plug & Play device found\n"); 1068 return 0; 1069 } 1070 request_region(isapnp_rdp, 1, "isapnp read"); 1071 } 1072 isapnp_build_device_list(); 1073 cards = 0; 1074 1075 protocol_for_each_card(&isapnp_protocol, card) { 1076 cards++; 1077 if (isapnp_verbose) { 1078 dev_info(&card->dev, "card '%s'\n", 1079 card->name[0] ? card->name : "unknown"); 1080 if (isapnp_verbose < 2) 1081 continue; 1082 card_for_each_dev(card, dev) { 1083 dev_info(&card->dev, "device '%s'\n", 1084 dev->name[0] ? dev->name : "unknown"); 1085 } 1086 } 1087 } 1088 if (cards) 1089 printk(KERN_INFO 1090 "isapnp: %i Plug & Play card%s detected total\n", cards, 1091 cards > 1 ? "s" : ""); 1092 else 1093 printk(KERN_INFO "isapnp: No Plug & Play card found\n"); 1094 1095 isapnp_proc_init(); 1096 return 0; 1097 } 1098 1099 device_initcall(isapnp_init); 1100 1101 /* format is: noisapnp */ 1102 1103 static int __init isapnp_setup_disable(char *str) 1104 { 1105 isapnp_disable = 1; 1106 return 1; 1107 } 1108 1109 __setup("noisapnp", isapnp_setup_disable); 1110 1111 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */ 1112 1113 static int __init isapnp_setup_isapnp(char *str) 1114 { 1115 (void)((get_option(&str, &isapnp_rdp) == 2) && 1116 (get_option(&str, &isapnp_reset) == 2) && 1117 (get_option(&str, &isapnp_verbose) == 2)); 1118 return 1; 1119 } 1120 1121 __setup("isapnp=", isapnp_setup_isapnp); 1122