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/moduleparam.h> 38 #include <linux/kernel.h> 39 #include <linux/errno.h> 40 #include <linux/delay.h> 41 #include <linux/init.h> 42 #include <linux/isapnp.h> 43 #include <linux/mutex.h> 44 #include <asm/io.h> 45 46 #include "../base.h" 47 48 #if 0 49 #define ISAPNP_REGION_OK 50 #endif 51 52 int isapnp_disable; /* Disable ISA PnP */ 53 static int isapnp_rdp; /* Read Data Port */ 54 static int isapnp_reset = 1; /* reset all PnP cards (deactivate) */ 55 static int isapnp_verbose = 1; /* verbose mode */ 56 57 module_param(isapnp_disable, int, 0); 58 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable"); 59 module_param(isapnp_rdp, int, 0); 60 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port"); 61 module_param(isapnp_reset, int, 0); 62 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards"); 63 module_param(isapnp_verbose, int, 0); 64 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode"); 65 66 #define _PIDXR 0x279 67 #define _PNPWRP 0xa79 68 69 /* short tags */ 70 #define _STAG_PNPVERNO 0x01 71 #define _STAG_LOGDEVID 0x02 72 #define _STAG_COMPATDEVID 0x03 73 #define _STAG_IRQ 0x04 74 #define _STAG_DMA 0x05 75 #define _STAG_STARTDEP 0x06 76 #define _STAG_ENDDEP 0x07 77 #define _STAG_IOPORT 0x08 78 #define _STAG_FIXEDIO 0x09 79 #define _STAG_VENDOR 0x0e 80 #define _STAG_END 0x0f 81 /* long tags */ 82 #define _LTAG_MEMRANGE 0x81 83 #define _LTAG_ANSISTR 0x82 84 #define _LTAG_UNICODESTR 0x83 85 #define _LTAG_VENDOR 0x84 86 #define _LTAG_MEM32RANGE 0x85 87 #define _LTAG_FIXEDMEM32RANGE 0x86 88 89 /* Logical device control and configuration registers */ 90 91 #define ISAPNP_CFG_ACTIVATE 0x30 /* byte */ 92 #define ISAPNP_CFG_MEM 0x40 /* 4 * dword */ 93 #define ISAPNP_CFG_PORT 0x60 /* 8 * word */ 94 #define ISAPNP_CFG_IRQ 0x70 /* 2 * word */ 95 #define ISAPNP_CFG_DMA 0x74 /* 2 * byte */ 96 97 /* 98 * Sizes of ISAPNP logical device configuration register sets. 99 * See PNP-ISA-v1.0a.pdf, Appendix A. 100 */ 101 #define ISAPNP_MAX_MEM 4 102 #define ISAPNP_MAX_PORT 8 103 #define ISAPNP_MAX_IRQ 2 104 #define ISAPNP_MAX_DMA 2 105 106 static unsigned char isapnp_checksum_value; 107 static DEFINE_MUTEX(isapnp_cfg_mutex); 108 static int isapnp_csn_count; 109 110 /* some prototypes */ 111 112 static inline void write_data(unsigned char x) 113 { 114 outb(x, _PNPWRP); 115 } 116 117 static inline void write_address(unsigned char x) 118 { 119 outb(x, _PIDXR); 120 udelay(20); 121 } 122 123 static inline unsigned char read_data(void) 124 { 125 unsigned char val = inb(isapnp_rdp); 126 return val; 127 } 128 129 unsigned char isapnp_read_byte(unsigned char idx) 130 { 131 write_address(idx); 132 return read_data(); 133 } 134 135 static unsigned short isapnp_read_word(unsigned char idx) 136 { 137 unsigned short val; 138 139 val = isapnp_read_byte(idx); 140 val = (val << 8) + isapnp_read_byte(idx + 1); 141 return val; 142 } 143 144 void isapnp_write_byte(unsigned char idx, unsigned char val) 145 { 146 write_address(idx); 147 write_data(val); 148 } 149 150 static void isapnp_write_word(unsigned char idx, unsigned short val) 151 { 152 isapnp_write_byte(idx, val >> 8); 153 isapnp_write_byte(idx + 1, val); 154 } 155 156 static void isapnp_key(void) 157 { 158 unsigned char code = 0x6a, msb; 159 int i; 160 161 mdelay(1); 162 write_address(0x00); 163 write_address(0x00); 164 165 write_address(code); 166 167 for (i = 1; i < 32; i++) { 168 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7; 169 code = (code >> 1) | msb; 170 write_address(code); 171 } 172 } 173 174 /* place all pnp cards in wait-for-key state */ 175 static void isapnp_wait(void) 176 { 177 isapnp_write_byte(0x02, 0x02); 178 } 179 180 static void isapnp_wake(unsigned char csn) 181 { 182 isapnp_write_byte(0x03, csn); 183 } 184 185 static void isapnp_device(unsigned char logdev) 186 { 187 isapnp_write_byte(0x07, logdev); 188 } 189 190 static void isapnp_activate(unsigned char logdev) 191 { 192 isapnp_device(logdev); 193 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1); 194 udelay(250); 195 } 196 197 static void isapnp_deactivate(unsigned char logdev) 198 { 199 isapnp_device(logdev); 200 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0); 201 udelay(500); 202 } 203 204 static void __init isapnp_peek(unsigned char *data, int bytes) 205 { 206 int i, j; 207 unsigned char d = 0; 208 209 for (i = 1; i <= bytes; i++) { 210 for (j = 0; j < 20; j++) { 211 d = isapnp_read_byte(0x05); 212 if (d & 1) 213 break; 214 udelay(100); 215 } 216 if (!(d & 1)) { 217 if (data != NULL) 218 *data++ = 0xff; 219 continue; 220 } 221 d = isapnp_read_byte(0x04); /* PRESDI */ 222 isapnp_checksum_value += d; 223 if (data != NULL) 224 *data++ = d; 225 } 226 } 227 228 #define RDP_STEP 32 /* minimum is 4 */ 229 230 static int isapnp_next_rdp(void) 231 { 232 int rdp = isapnp_rdp; 233 static int old_rdp = 0; 234 235 if (old_rdp) { 236 release_region(old_rdp, 1); 237 old_rdp = 0; 238 } 239 while (rdp <= 0x3ff) { 240 /* 241 * We cannot use NE2000 probe spaces for ISAPnP or we 242 * will lock up machines. 243 */ 244 if ((rdp < 0x280 || rdp > 0x380) 245 && request_region(rdp, 1, "ISAPnP")) { 246 isapnp_rdp = rdp; 247 old_rdp = rdp; 248 return 0; 249 } 250 rdp += RDP_STEP; 251 } 252 return -1; 253 } 254 255 /* Set read port address */ 256 static inline void isapnp_set_rdp(void) 257 { 258 isapnp_write_byte(0x00, isapnp_rdp >> 2); 259 udelay(100); 260 } 261 262 /* 263 * Perform an isolation. The port selection code now tries to avoid 264 * "dangerous to read" ports. 265 */ 266 static int __init isapnp_isolate_rdp_select(void) 267 { 268 isapnp_wait(); 269 isapnp_key(); 270 271 /* Control: reset CSN and conditionally everything else too */ 272 isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04); 273 mdelay(2); 274 275 isapnp_wait(); 276 isapnp_key(); 277 isapnp_wake(0x00); 278 279 if (isapnp_next_rdp() < 0) { 280 isapnp_wait(); 281 return -1; 282 } 283 284 isapnp_set_rdp(); 285 udelay(1000); 286 write_address(0x01); 287 udelay(1000); 288 return 0; 289 } 290 291 /* 292 * Isolate (assign uniqued CSN) to all ISA PnP devices. 293 */ 294 static int __init isapnp_isolate(void) 295 { 296 unsigned char checksum = 0x6a; 297 unsigned char chksum = 0x00; 298 unsigned char bit = 0x00; 299 int data; 300 int csn = 0; 301 int i; 302 int iteration = 1; 303 304 isapnp_rdp = 0x213; 305 if (isapnp_isolate_rdp_select() < 0) 306 return -1; 307 308 while (1) { 309 for (i = 1; i <= 64; i++) { 310 data = read_data() << 8; 311 udelay(250); 312 data = data | read_data(); 313 udelay(250); 314 if (data == 0x55aa) 315 bit = 0x01; 316 checksum = 317 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) 318 | (checksum >> 1); 319 bit = 0x00; 320 } 321 for (i = 65; i <= 72; i++) { 322 data = read_data() << 8; 323 udelay(250); 324 data = data | read_data(); 325 udelay(250); 326 if (data == 0x55aa) 327 chksum |= (1 << (i - 65)); 328 } 329 if (checksum != 0x00 && checksum == chksum) { 330 csn++; 331 332 isapnp_write_byte(0x06, csn); 333 udelay(250); 334 iteration++; 335 isapnp_wake(0x00); 336 isapnp_set_rdp(); 337 udelay(1000); 338 write_address(0x01); 339 udelay(1000); 340 goto __next; 341 } 342 if (iteration == 1) { 343 isapnp_rdp += RDP_STEP; 344 if (isapnp_isolate_rdp_select() < 0) 345 return -1; 346 } else if (iteration > 1) { 347 break; 348 } 349 __next: 350 if (csn == 255) 351 break; 352 checksum = 0x6a; 353 chksum = 0x00; 354 bit = 0x00; 355 } 356 isapnp_wait(); 357 isapnp_csn_count = csn; 358 return csn; 359 } 360 361 /* 362 * Read one tag from stream. 363 */ 364 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size) 365 { 366 unsigned char tag, tmp[2]; 367 368 isapnp_peek(&tag, 1); 369 if (tag == 0) /* invalid tag */ 370 return -1; 371 if (tag & 0x80) { /* large item */ 372 *type = tag; 373 isapnp_peek(tmp, 2); 374 *size = (tmp[1] << 8) | tmp[0]; 375 } else { 376 *type = (tag >> 3) & 0x0f; 377 *size = tag & 0x07; 378 } 379 if (*type == 0xff && *size == 0xffff) /* probably invalid data */ 380 return -1; 381 return 0; 382 } 383 384 /* 385 * Skip specified number of bytes from stream. 386 */ 387 static void __init isapnp_skip_bytes(int count) 388 { 389 isapnp_peek(NULL, count); 390 } 391 392 /* 393 * Parse logical device tag. 394 */ 395 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card, 396 int size, int number) 397 { 398 unsigned char tmp[6]; 399 struct pnp_dev *dev; 400 u32 eisa_id; 401 char id[8]; 402 403 isapnp_peek(tmp, size); 404 eisa_id = tmp[0] | tmp[1] << 8 | tmp[2] << 16 | tmp[3] << 24; 405 pnp_eisa_id_to_string(eisa_id, id); 406 407 dev = pnp_alloc_dev(&isapnp_protocol, number, id); 408 if (!dev) 409 return NULL; 410 411 dev->card = card; 412 dev->capabilities |= PNP_CONFIGURABLE; 413 dev->capabilities |= PNP_READ; 414 dev->capabilities |= PNP_WRITE; 415 dev->capabilities |= PNP_DISABLE; 416 pnp_init_resources(dev); 417 return dev; 418 } 419 420 /* 421 * Add IRQ resource to resources list. 422 */ 423 static void __init isapnp_parse_irq_resource(struct pnp_dev *dev, 424 unsigned int option_flags, 425 int size) 426 { 427 unsigned char tmp[3]; 428 unsigned long bits; 429 pnp_irq_mask_t map; 430 unsigned char flags = IORESOURCE_IRQ_HIGHEDGE; 431 432 isapnp_peek(tmp, size); 433 bits = (tmp[1] << 8) | tmp[0]; 434 435 bitmap_zero(map.bits, PNP_IRQ_NR); 436 bitmap_copy(map.bits, &bits, 16); 437 438 if (size > 2) 439 flags = tmp[2]; 440 441 pnp_register_irq_resource(dev, option_flags, &map, flags); 442 } 443 444 /* 445 * Add DMA resource to resources list. 446 */ 447 static void __init isapnp_parse_dma_resource(struct pnp_dev *dev, 448 unsigned int option_flags, 449 int size) 450 { 451 unsigned char tmp[2]; 452 453 isapnp_peek(tmp, size); 454 pnp_register_dma_resource(dev, option_flags, tmp[0], tmp[1]); 455 } 456 457 /* 458 * Add port resource to resources list. 459 */ 460 static void __init isapnp_parse_port_resource(struct pnp_dev *dev, 461 unsigned int option_flags, 462 int size) 463 { 464 unsigned char tmp[7]; 465 resource_size_t min, max, align, len; 466 unsigned char flags; 467 468 isapnp_peek(tmp, size); 469 min = (tmp[2] << 8) | tmp[1]; 470 max = (tmp[4] << 8) | tmp[3]; 471 align = tmp[5]; 472 len = tmp[6]; 473 flags = tmp[0] ? IORESOURCE_IO_16BIT_ADDR : 0; 474 pnp_register_port_resource(dev, option_flags, 475 min, max, align, len, flags); 476 } 477 478 /* 479 * Add fixed port resource to resources list. 480 */ 481 static void __init isapnp_parse_fixed_port_resource(struct pnp_dev *dev, 482 unsigned int option_flags, 483 int size) 484 { 485 unsigned char tmp[3]; 486 resource_size_t base, len; 487 488 isapnp_peek(tmp, size); 489 base = (tmp[1] << 8) | tmp[0]; 490 len = tmp[2]; 491 pnp_register_port_resource(dev, option_flags, base, base, 0, len, 492 IORESOURCE_IO_FIXED); 493 } 494 495 /* 496 * Add memory resource to resources list. 497 */ 498 static void __init isapnp_parse_mem_resource(struct pnp_dev *dev, 499 unsigned int option_flags, 500 int size) 501 { 502 unsigned char tmp[9]; 503 resource_size_t min, max, align, len; 504 unsigned char flags; 505 506 isapnp_peek(tmp, size); 507 min = ((tmp[2] << 8) | tmp[1]) << 8; 508 max = ((tmp[4] << 8) | tmp[3]) << 8; 509 align = (tmp[6] << 8) | tmp[5]; 510 len = ((tmp[8] << 8) | tmp[7]) << 8; 511 flags = tmp[0]; 512 pnp_register_mem_resource(dev, option_flags, 513 min, max, align, len, flags); 514 } 515 516 /* 517 * Add 32-bit memory resource to resources list. 518 */ 519 static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev, 520 unsigned int option_flags, 521 int size) 522 { 523 unsigned char tmp[17]; 524 resource_size_t min, max, align, len; 525 unsigned char flags; 526 527 isapnp_peek(tmp, size); 528 min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 529 max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 530 align = (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9]; 531 len = (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13]; 532 flags = tmp[0]; 533 pnp_register_mem_resource(dev, option_flags, 534 min, max, align, len, flags); 535 } 536 537 /* 538 * Add 32-bit fixed memory resource to resources list. 539 */ 540 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev, 541 unsigned int option_flags, 542 int size) 543 { 544 unsigned char tmp[9]; 545 resource_size_t base, len; 546 unsigned char flags; 547 548 isapnp_peek(tmp, size); 549 base = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 550 len = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 551 flags = tmp[0]; 552 pnp_register_mem_resource(dev, option_flags, base, base, 0, len, flags); 553 } 554 555 /* 556 * Parse card name for ISA PnP device. 557 */ 558 static void __init 559 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size) 560 { 561 if (name[0] == '\0') { 562 unsigned short size1 = 563 *size >= name_max ? (name_max - 1) : *size; 564 isapnp_peek(name, size1); 565 name[size1] = '\0'; 566 *size -= size1; 567 568 /* clean whitespace from end of string */ 569 while (size1 > 0 && name[--size1] == ' ') 570 name[size1] = '\0'; 571 } 572 } 573 574 /* 575 * Parse resource map for logical device. 576 */ 577 static int __init isapnp_create_device(struct pnp_card *card, 578 unsigned short size) 579 { 580 int number = 0, skip = 0, priority, compat = 0; 581 unsigned char type, tmp[17]; 582 unsigned int option_flags; 583 struct pnp_dev *dev; 584 u32 eisa_id; 585 char id[8]; 586 587 if ((dev = isapnp_parse_device(card, size, number++)) == NULL) 588 return 1; 589 option_flags = 0; 590 pnp_add_card_device(card, dev); 591 592 while (1) { 593 if (isapnp_read_tag(&type, &size) < 0) 594 return 1; 595 if (skip && type != _STAG_LOGDEVID && type != _STAG_END) 596 goto __skip; 597 switch (type) { 598 case _STAG_LOGDEVID: 599 if (size >= 5 && size <= 6) { 600 if ((dev = 601 isapnp_parse_device(card, size, 602 number++)) == NULL) 603 return 1; 604 size = 0; 605 skip = 0; 606 option_flags = 0; 607 pnp_add_card_device(card, dev); 608 } else { 609 skip = 1; 610 } 611 compat = 0; 612 break; 613 case _STAG_COMPATDEVID: 614 if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) { 615 isapnp_peek(tmp, 4); 616 eisa_id = tmp[0] | tmp[1] << 8 | 617 tmp[2] << 16 | tmp[3] << 24; 618 pnp_eisa_id_to_string(eisa_id, id); 619 pnp_add_id(dev, id); 620 compat++; 621 size = 0; 622 } 623 break; 624 case _STAG_IRQ: 625 if (size < 2 || size > 3) 626 goto __skip; 627 isapnp_parse_irq_resource(dev, option_flags, size); 628 size = 0; 629 break; 630 case _STAG_DMA: 631 if (size != 2) 632 goto __skip; 633 isapnp_parse_dma_resource(dev, option_flags, size); 634 size = 0; 635 break; 636 case _STAG_STARTDEP: 637 if (size > 1) 638 goto __skip; 639 priority = PNP_RES_PRIORITY_ACCEPTABLE; 640 if (size > 0) { 641 isapnp_peek(tmp, size); 642 priority = tmp[0]; 643 size = 0; 644 } 645 option_flags = pnp_new_dependent_set(dev, priority); 646 break; 647 case _STAG_ENDDEP: 648 if (size != 0) 649 goto __skip; 650 option_flags = 0; 651 break; 652 case _STAG_IOPORT: 653 if (size != 7) 654 goto __skip; 655 isapnp_parse_port_resource(dev, option_flags, size); 656 size = 0; 657 break; 658 case _STAG_FIXEDIO: 659 if (size != 3) 660 goto __skip; 661 isapnp_parse_fixed_port_resource(dev, option_flags, 662 size); 663 size = 0; 664 break; 665 case _STAG_VENDOR: 666 break; 667 case _LTAG_MEMRANGE: 668 if (size != 9) 669 goto __skip; 670 isapnp_parse_mem_resource(dev, option_flags, size); 671 size = 0; 672 break; 673 case _LTAG_ANSISTR: 674 isapnp_parse_name(dev->name, sizeof(dev->name), &size); 675 break; 676 case _LTAG_UNICODESTR: 677 /* silently ignore */ 678 /* who use unicode for hardware identification? */ 679 break; 680 case _LTAG_VENDOR: 681 break; 682 case _LTAG_MEM32RANGE: 683 if (size != 17) 684 goto __skip; 685 isapnp_parse_mem32_resource(dev, option_flags, size); 686 size = 0; 687 break; 688 case _LTAG_FIXEDMEM32RANGE: 689 if (size != 9) 690 goto __skip; 691 isapnp_parse_fixed_mem32_resource(dev, option_flags, 692 size); 693 size = 0; 694 break; 695 case _STAG_END: 696 if (size > 0) 697 isapnp_skip_bytes(size); 698 return 1; 699 default: 700 dev_err(&dev->dev, "unknown tag %#x (card %i), " 701 "ignored\n", type, card->number); 702 } 703 __skip: 704 if (size > 0) 705 isapnp_skip_bytes(size); 706 } 707 return 0; 708 } 709 710 /* 711 * Parse resource map for ISA PnP card. 712 */ 713 static void __init isapnp_parse_resource_map(struct pnp_card *card) 714 { 715 unsigned char type, tmp[17]; 716 unsigned short size; 717 718 while (1) { 719 if (isapnp_read_tag(&type, &size) < 0) 720 return; 721 switch (type) { 722 case _STAG_PNPVERNO: 723 if (size != 2) 724 goto __skip; 725 isapnp_peek(tmp, 2); 726 card->pnpver = tmp[0]; 727 card->productver = tmp[1]; 728 size = 0; 729 break; 730 case _STAG_LOGDEVID: 731 if (size >= 5 && size <= 6) { 732 if (isapnp_create_device(card, size) == 1) 733 return; 734 size = 0; 735 } 736 break; 737 case _STAG_VENDOR: 738 break; 739 case _LTAG_ANSISTR: 740 isapnp_parse_name(card->name, sizeof(card->name), 741 &size); 742 break; 743 case _LTAG_UNICODESTR: 744 /* silently ignore */ 745 /* who use unicode for hardware identification? */ 746 break; 747 case _LTAG_VENDOR: 748 break; 749 case _STAG_END: 750 if (size > 0) 751 isapnp_skip_bytes(size); 752 return; 753 default: 754 dev_err(&card->dev, "unknown tag %#x, ignored\n", 755 type); 756 } 757 __skip: 758 if (size > 0) 759 isapnp_skip_bytes(size); 760 } 761 } 762 763 /* 764 * Compute ISA PnP checksum for first eight bytes. 765 */ 766 static unsigned char __init isapnp_checksum(unsigned char *data) 767 { 768 int i, j; 769 unsigned char checksum = 0x6a, bit, b; 770 771 for (i = 0; i < 8; i++) { 772 b = data[i]; 773 for (j = 0; j < 8; j++) { 774 bit = 0; 775 if (b & (1 << j)) 776 bit = 1; 777 checksum = 778 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) 779 | (checksum >> 1); 780 } 781 } 782 return checksum; 783 } 784 785 /* 786 * Build device list for all present ISA PnP devices. 787 */ 788 static int __init isapnp_build_device_list(void) 789 { 790 int csn; 791 unsigned char header[9], checksum; 792 struct pnp_card *card; 793 u32 eisa_id; 794 char id[8]; 795 796 isapnp_wait(); 797 isapnp_key(); 798 for (csn = 1; csn <= isapnp_csn_count; csn++) { 799 isapnp_wake(csn); 800 isapnp_peek(header, 9); 801 checksum = isapnp_checksum(header); 802 eisa_id = header[0] | header[1] << 8 | 803 header[2] << 16 | header[3] << 24; 804 pnp_eisa_id_to_string(eisa_id, id); 805 card = pnp_alloc_card(&isapnp_protocol, csn, id); 806 if (!card) 807 continue; 808 809 INIT_LIST_HEAD(&card->devices); 810 card->serial = 811 (header[7] << 24) | (header[6] << 16) | (header[5] << 8) | 812 header[4]; 813 isapnp_checksum_value = 0x00; 814 isapnp_parse_resource_map(card); 815 if (isapnp_checksum_value != 0x00) 816 dev_err(&card->dev, "invalid checksum %#x\n", 817 isapnp_checksum_value); 818 card->checksum = isapnp_checksum_value; 819 820 pnp_add_card(card); 821 } 822 isapnp_wait(); 823 return 0; 824 } 825 826 /* 827 * Basic configuration routines. 828 */ 829 830 int isapnp_present(void) 831 { 832 struct pnp_card *card; 833 834 pnp_for_each_card(card) { 835 if (card->protocol == &isapnp_protocol) 836 return 1; 837 } 838 return 0; 839 } 840 841 int isapnp_cfg_begin(int csn, int logdev) 842 { 843 if (csn < 1 || csn > isapnp_csn_count || logdev > 10) 844 return -EINVAL; 845 mutex_lock(&isapnp_cfg_mutex); 846 isapnp_wait(); 847 isapnp_key(); 848 isapnp_wake(csn); 849 #if 0 850 /* to avoid malfunction when the isapnptools package is used */ 851 /* we must set RDP to our value again */ 852 /* it is possible to set RDP only in the isolation phase */ 853 /* Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */ 854 isapnp_write_byte(0x02, 0x04); /* clear CSN of card */ 855 mdelay(2); /* is this necessary? */ 856 isapnp_wake(csn); /* bring card into sleep state */ 857 isapnp_wake(0); /* bring card into isolation state */ 858 isapnp_set_rdp(); /* reset the RDP port */ 859 udelay(1000); /* delay 1000us */ 860 isapnp_write_byte(0x06, csn); /* reset CSN to previous value */ 861 udelay(250); /* is this necessary? */ 862 #endif 863 if (logdev >= 0) 864 isapnp_device(logdev); 865 return 0; 866 } 867 868 int isapnp_cfg_end(void) 869 { 870 isapnp_wait(); 871 mutex_unlock(&isapnp_cfg_mutex); 872 return 0; 873 } 874 875 /* 876 * Initialization. 877 */ 878 879 EXPORT_SYMBOL(isapnp_protocol); 880 EXPORT_SYMBOL(isapnp_present); 881 EXPORT_SYMBOL(isapnp_cfg_begin); 882 EXPORT_SYMBOL(isapnp_cfg_end); 883 EXPORT_SYMBOL(isapnp_write_byte); 884 885 static int isapnp_get_resources(struct pnp_dev *dev) 886 { 887 int i, ret; 888 889 pnp_dbg(&dev->dev, "get resources\n"); 890 pnp_init_resources(dev); 891 isapnp_cfg_begin(dev->card->number, dev->number); 892 dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE); 893 if (!dev->active) 894 goto __end; 895 896 for (i = 0; i < ISAPNP_MAX_PORT; i++) { 897 ret = isapnp_read_word(ISAPNP_CFG_PORT + (i << 1)); 898 pnp_add_io_resource(dev, ret, ret, 899 ret == 0 ? IORESOURCE_DISABLED : 0); 900 } 901 for (i = 0; i < ISAPNP_MAX_MEM; i++) { 902 ret = isapnp_read_word(ISAPNP_CFG_MEM + (i << 3)) << 8; 903 pnp_add_mem_resource(dev, ret, ret, 904 ret == 0 ? IORESOURCE_DISABLED : 0); 905 } 906 for (i = 0; i < ISAPNP_MAX_IRQ; i++) { 907 ret = isapnp_read_word(ISAPNP_CFG_IRQ + (i << 1)) >> 8; 908 pnp_add_irq_resource(dev, ret, 909 ret == 0 ? IORESOURCE_DISABLED : 0); 910 } 911 for (i = 0; i < ISAPNP_MAX_DMA; i++) { 912 ret = isapnp_read_byte(ISAPNP_CFG_DMA + i); 913 pnp_add_dma_resource(dev, ret, 914 ret == 4 ? IORESOURCE_DISABLED : 0); 915 } 916 917 __end: 918 isapnp_cfg_end(); 919 return 0; 920 } 921 922 static int isapnp_set_resources(struct pnp_dev *dev) 923 { 924 struct resource *res; 925 int tmp; 926 927 pnp_dbg(&dev->dev, "set resources\n"); 928 isapnp_cfg_begin(dev->card->number, dev->number); 929 dev->active = 1; 930 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) { 931 res = pnp_get_resource(dev, IORESOURCE_IO, tmp); 932 if (pnp_resource_enabled(res)) { 933 pnp_dbg(&dev->dev, " set io %d to %#llx\n", 934 tmp, (unsigned long long) res->start); 935 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1), 936 res->start); 937 } 938 } 939 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) { 940 res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp); 941 if (pnp_resource_enabled(res)) { 942 int irq = res->start; 943 if (irq == 2) 944 irq = 9; 945 pnp_dbg(&dev->dev, " set irq %d to %d\n", tmp, irq); 946 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq); 947 } 948 } 949 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) { 950 res = pnp_get_resource(dev, IORESOURCE_DMA, tmp); 951 if (pnp_resource_enabled(res)) { 952 pnp_dbg(&dev->dev, " set dma %d to %lld\n", 953 tmp, (unsigned long long) res->start); 954 isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start); 955 } 956 } 957 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) { 958 res = pnp_get_resource(dev, IORESOURCE_MEM, tmp); 959 if (pnp_resource_enabled(res)) { 960 pnp_dbg(&dev->dev, " set mem %d to %#llx\n", 961 tmp, (unsigned long long) res->start); 962 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3), 963 (res->start >> 8) & 0xffff); 964 } 965 } 966 /* FIXME: We aren't handling 32bit mems properly here */ 967 isapnp_activate(dev->number); 968 isapnp_cfg_end(); 969 return 0; 970 } 971 972 static int isapnp_disable_resources(struct pnp_dev *dev) 973 { 974 if (!dev->active) 975 return -EINVAL; 976 isapnp_cfg_begin(dev->card->number, dev->number); 977 isapnp_deactivate(dev->number); 978 dev->active = 0; 979 isapnp_cfg_end(); 980 return 0; 981 } 982 983 struct pnp_protocol isapnp_protocol = { 984 .name = "ISA Plug and Play", 985 .get = isapnp_get_resources, 986 .set = isapnp_set_resources, 987 .disable = isapnp_disable_resources, 988 }; 989 990 static int __init isapnp_init(void) 991 { 992 int cards; 993 struct pnp_card *card; 994 struct pnp_dev *dev; 995 996 if (isapnp_disable) { 997 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n"); 998 return 0; 999 } 1000 #ifdef CONFIG_PPC 1001 if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP)) 1002 return -EINVAL; 1003 #endif 1004 #ifdef ISAPNP_REGION_OK 1005 if (!request_region(_PIDXR, 1, "isapnp index")) { 1006 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n", 1007 _PIDXR); 1008 return -EBUSY; 1009 } 1010 #endif 1011 if (!request_region(_PNPWRP, 1, "isapnp write")) { 1012 printk(KERN_ERR 1013 "isapnp: Write Data Register 0x%x already used\n", 1014 _PNPWRP); 1015 #ifdef ISAPNP_REGION_OK 1016 release_region(_PIDXR, 1); 1017 #endif 1018 return -EBUSY; 1019 } 1020 1021 if (pnp_register_protocol(&isapnp_protocol) < 0) 1022 return -EBUSY; 1023 1024 /* 1025 * Print a message. The existing ISAPnP code is hanging machines 1026 * so let the user know where. 1027 */ 1028 1029 printk(KERN_INFO "isapnp: Scanning for PnP cards...\n"); 1030 if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) { 1031 isapnp_rdp |= 3; 1032 if (!request_region(isapnp_rdp, 1, "isapnp read")) { 1033 printk(KERN_ERR 1034 "isapnp: Read Data Register 0x%x already used\n", 1035 isapnp_rdp); 1036 #ifdef ISAPNP_REGION_OK 1037 release_region(_PIDXR, 1); 1038 #endif 1039 release_region(_PNPWRP, 1); 1040 return -EBUSY; 1041 } 1042 isapnp_set_rdp(); 1043 } 1044 if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) { 1045 cards = isapnp_isolate(); 1046 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) { 1047 #ifdef ISAPNP_REGION_OK 1048 release_region(_PIDXR, 1); 1049 #endif 1050 release_region(_PNPWRP, 1); 1051 printk(KERN_INFO 1052 "isapnp: No Plug & Play device found\n"); 1053 return 0; 1054 } 1055 request_region(isapnp_rdp, 1, "isapnp read"); 1056 } 1057 isapnp_build_device_list(); 1058 cards = 0; 1059 1060 protocol_for_each_card(&isapnp_protocol, card) { 1061 cards++; 1062 if (isapnp_verbose) { 1063 dev_info(&card->dev, "card '%s'\n", 1064 card->name[0] ? card->name : "unknown"); 1065 if (isapnp_verbose < 2) 1066 continue; 1067 card_for_each_dev(card, dev) { 1068 dev_info(&card->dev, "device '%s'\n", 1069 dev->name[0] ? dev->name : "unknown"); 1070 } 1071 } 1072 } 1073 if (cards) 1074 printk(KERN_INFO 1075 "isapnp: %i Plug & Play card%s detected total\n", cards, 1076 cards > 1 ? "s" : ""); 1077 else 1078 printk(KERN_INFO "isapnp: No Plug & Play card found\n"); 1079 1080 isapnp_proc_init(); 1081 return 0; 1082 } 1083 1084 device_initcall(isapnp_init); 1085 1086 /* format is: noisapnp */ 1087 1088 static int __init isapnp_setup_disable(char *str) 1089 { 1090 isapnp_disable = 1; 1091 return 1; 1092 } 1093 1094 __setup("noisapnp", isapnp_setup_disable); 1095 1096 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */ 1097 1098 static int __init isapnp_setup_isapnp(char *str) 1099 { 1100 (void)((get_option(&str, &isapnp_rdp) == 2) && 1101 (get_option(&str, &isapnp_reset) == 2) && 1102 (get_option(&str, &isapnp_verbose) == 2)); 1103 return 1; 1104 } 1105 1106 __setup("isapnp=", isapnp_setup_isapnp); 1107