1 /* 2 * ISA Plug & Play support 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19 * 20 * Changelog: 21 * 2000-01-01 Added quirks handling for buggy hardware 22 * Peter Denison <peterd@pnd-pc.demon.co.uk> 23 * 2000-06-14 Added isapnp_probe_devs() and isapnp_activate_dev() 24 * Christoph Hellwig <hch@infradead.org> 25 * 2001-06-03 Added release_region calls to correspond with 26 * request_region calls when a failure occurs. Also 27 * added KERN_* constants to printk() calls. 28 * 2001-11-07 Added isapnp_{,un}register_driver calls along the lines 29 * of the pci driver interface 30 * Kai Germaschewski <kai.germaschewski@gmx.de> 31 * 2002-06-06 Made the use of dma channel 0 configurable 32 * Gerald Teschl <gerald.teschl@univie.ac.at> 33 * 2002-10-06 Ported to PnP Layer - Adam Belay <ambx1@neo.rr.com> 34 * 2003-08-11 Resource Management Updates - Adam Belay <ambx1@neo.rr.com> 35 */ 36 37 #include <linux/module.h> 38 #include <linux/kernel.h> 39 #include <linux/errno.h> 40 #include <linux/slab.h> 41 #include <linux/delay.h> 42 #include <linux/init.h> 43 #include <linux/isapnp.h> 44 #include <linux/mutex.h> 45 #include <asm/io.h> 46 47 #include "../base.h" 48 49 #if 0 50 #define ISAPNP_REGION_OK 51 #endif 52 53 int isapnp_disable; /* Disable ISA PnP */ 54 static int isapnp_rdp; /* Read Data Port */ 55 static int isapnp_reset = 1; /* reset all PnP cards (deactivate) */ 56 static int isapnp_verbose = 1; /* verbose mode */ 57 58 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); 59 MODULE_DESCRIPTION("Generic ISA Plug & Play support"); 60 module_param(isapnp_disable, int, 0); 61 MODULE_PARM_DESC(isapnp_disable, "ISA Plug & Play disable"); 62 module_param(isapnp_rdp, int, 0); 63 MODULE_PARM_DESC(isapnp_rdp, "ISA Plug & Play read data port"); 64 module_param(isapnp_reset, int, 0); 65 MODULE_PARM_DESC(isapnp_reset, "ISA Plug & Play reset all cards"); 66 module_param(isapnp_verbose, int, 0); 67 MODULE_PARM_DESC(isapnp_verbose, "ISA Plug & Play verbose mode"); 68 MODULE_LICENSE("GPL"); 69 70 #define _PIDXR 0x279 71 #define _PNPWRP 0xa79 72 73 /* short tags */ 74 #define _STAG_PNPVERNO 0x01 75 #define _STAG_LOGDEVID 0x02 76 #define _STAG_COMPATDEVID 0x03 77 #define _STAG_IRQ 0x04 78 #define _STAG_DMA 0x05 79 #define _STAG_STARTDEP 0x06 80 #define _STAG_ENDDEP 0x07 81 #define _STAG_IOPORT 0x08 82 #define _STAG_FIXEDIO 0x09 83 #define _STAG_VENDOR 0x0e 84 #define _STAG_END 0x0f 85 /* long tags */ 86 #define _LTAG_MEMRANGE 0x81 87 #define _LTAG_ANSISTR 0x82 88 #define _LTAG_UNICODESTR 0x83 89 #define _LTAG_VENDOR 0x84 90 #define _LTAG_MEM32RANGE 0x85 91 #define _LTAG_FIXEDMEM32RANGE 0x86 92 93 /* Logical device control and configuration registers */ 94 95 #define ISAPNP_CFG_ACTIVATE 0x30 /* byte */ 96 #define ISAPNP_CFG_MEM 0x40 /* 4 * dword */ 97 #define ISAPNP_CFG_PORT 0x60 /* 8 * word */ 98 #define ISAPNP_CFG_IRQ 0x70 /* 2 * word */ 99 #define ISAPNP_CFG_DMA 0x74 /* 2 * byte */ 100 101 /* 102 * Sizes of ISAPNP logical device configuration register sets. 103 * See PNP-ISA-v1.0a.pdf, Appendix A. 104 */ 105 #define ISAPNP_MAX_MEM 4 106 #define ISAPNP_MAX_PORT 8 107 #define ISAPNP_MAX_IRQ 2 108 #define ISAPNP_MAX_DMA 2 109 110 static unsigned char isapnp_checksum_value; 111 static DEFINE_MUTEX(isapnp_cfg_mutex); 112 static int isapnp_csn_count; 113 114 /* some prototypes */ 115 116 static inline void write_data(unsigned char x) 117 { 118 outb(x, _PNPWRP); 119 } 120 121 static inline void write_address(unsigned char x) 122 { 123 outb(x, _PIDXR); 124 udelay(20); 125 } 126 127 static inline unsigned char read_data(void) 128 { 129 unsigned char val = inb(isapnp_rdp); 130 return val; 131 } 132 133 unsigned char isapnp_read_byte(unsigned char idx) 134 { 135 write_address(idx); 136 return read_data(); 137 } 138 139 static unsigned short isapnp_read_word(unsigned char idx) 140 { 141 unsigned short val; 142 143 val = isapnp_read_byte(idx); 144 val = (val << 8) + isapnp_read_byte(idx + 1); 145 return val; 146 } 147 148 void isapnp_write_byte(unsigned char idx, unsigned char val) 149 { 150 write_address(idx); 151 write_data(val); 152 } 153 154 static void isapnp_write_word(unsigned char idx, unsigned short val) 155 { 156 isapnp_write_byte(idx, val >> 8); 157 isapnp_write_byte(idx + 1, val); 158 } 159 160 static void isapnp_key(void) 161 { 162 unsigned char code = 0x6a, msb; 163 int i; 164 165 mdelay(1); 166 write_address(0x00); 167 write_address(0x00); 168 169 write_address(code); 170 171 for (i = 1; i < 32; i++) { 172 msb = ((code & 0x01) ^ ((code & 0x02) >> 1)) << 7; 173 code = (code >> 1) | msb; 174 write_address(code); 175 } 176 } 177 178 /* place all pnp cards in wait-for-key state */ 179 static void isapnp_wait(void) 180 { 181 isapnp_write_byte(0x02, 0x02); 182 } 183 184 static void isapnp_wake(unsigned char csn) 185 { 186 isapnp_write_byte(0x03, csn); 187 } 188 189 static void isapnp_device(unsigned char logdev) 190 { 191 isapnp_write_byte(0x07, logdev); 192 } 193 194 static void isapnp_activate(unsigned char logdev) 195 { 196 isapnp_device(logdev); 197 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 1); 198 udelay(250); 199 } 200 201 static void isapnp_deactivate(unsigned char logdev) 202 { 203 isapnp_device(logdev); 204 isapnp_write_byte(ISAPNP_CFG_ACTIVATE, 0); 205 udelay(500); 206 } 207 208 static void __init isapnp_peek(unsigned char *data, int bytes) 209 { 210 int i, j; 211 unsigned char d = 0; 212 213 for (i = 1; i <= bytes; i++) { 214 for (j = 0; j < 20; j++) { 215 d = isapnp_read_byte(0x05); 216 if (d & 1) 217 break; 218 udelay(100); 219 } 220 if (!(d & 1)) { 221 if (data != NULL) 222 *data++ = 0xff; 223 continue; 224 } 225 d = isapnp_read_byte(0x04); /* PRESDI */ 226 isapnp_checksum_value += d; 227 if (data != NULL) 228 *data++ = d; 229 } 230 } 231 232 #define RDP_STEP 32 /* minimum is 4 */ 233 234 static int isapnp_next_rdp(void) 235 { 236 int rdp = isapnp_rdp; 237 static int old_rdp = 0; 238 239 if (old_rdp) { 240 release_region(old_rdp, 1); 241 old_rdp = 0; 242 } 243 while (rdp <= 0x3ff) { 244 /* 245 * We cannot use NE2000 probe spaces for ISAPnP or we 246 * will lock up machines. 247 */ 248 if ((rdp < 0x280 || rdp > 0x380) 249 && request_region(rdp, 1, "ISAPnP")) { 250 isapnp_rdp = rdp; 251 old_rdp = rdp; 252 return 0; 253 } 254 rdp += RDP_STEP; 255 } 256 return -1; 257 } 258 259 /* Set read port address */ 260 static inline void isapnp_set_rdp(void) 261 { 262 isapnp_write_byte(0x00, isapnp_rdp >> 2); 263 udelay(100); 264 } 265 266 /* 267 * Perform an isolation. The port selection code now tries to avoid 268 * "dangerous to read" ports. 269 */ 270 static int __init isapnp_isolate_rdp_select(void) 271 { 272 isapnp_wait(); 273 isapnp_key(); 274 275 /* Control: reset CSN and conditionally everything else too */ 276 isapnp_write_byte(0x02, isapnp_reset ? 0x05 : 0x04); 277 mdelay(2); 278 279 isapnp_wait(); 280 isapnp_key(); 281 isapnp_wake(0x00); 282 283 if (isapnp_next_rdp() < 0) { 284 isapnp_wait(); 285 return -1; 286 } 287 288 isapnp_set_rdp(); 289 udelay(1000); 290 write_address(0x01); 291 udelay(1000); 292 return 0; 293 } 294 295 /* 296 * Isolate (assign uniqued CSN) to all ISA PnP devices. 297 */ 298 static int __init isapnp_isolate(void) 299 { 300 unsigned char checksum = 0x6a; 301 unsigned char chksum = 0x00; 302 unsigned char bit = 0x00; 303 int data; 304 int csn = 0; 305 int i; 306 int iteration = 1; 307 308 isapnp_rdp = 0x213; 309 if (isapnp_isolate_rdp_select() < 0) 310 return -1; 311 312 while (1) { 313 for (i = 1; i <= 64; i++) { 314 data = read_data() << 8; 315 udelay(250); 316 data = data | read_data(); 317 udelay(250); 318 if (data == 0x55aa) 319 bit = 0x01; 320 checksum = 321 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) 322 | (checksum >> 1); 323 bit = 0x00; 324 } 325 for (i = 65; i <= 72; i++) { 326 data = read_data() << 8; 327 udelay(250); 328 data = data | read_data(); 329 udelay(250); 330 if (data == 0x55aa) 331 chksum |= (1 << (i - 65)); 332 } 333 if (checksum != 0x00 && checksum == chksum) { 334 csn++; 335 336 isapnp_write_byte(0x06, csn); 337 udelay(250); 338 iteration++; 339 isapnp_wake(0x00); 340 isapnp_set_rdp(); 341 udelay(1000); 342 write_address(0x01); 343 udelay(1000); 344 goto __next; 345 } 346 if (iteration == 1) { 347 isapnp_rdp += RDP_STEP; 348 if (isapnp_isolate_rdp_select() < 0) 349 return -1; 350 } else if (iteration > 1) { 351 break; 352 } 353 __next: 354 if (csn == 255) 355 break; 356 checksum = 0x6a; 357 chksum = 0x00; 358 bit = 0x00; 359 } 360 isapnp_wait(); 361 isapnp_csn_count = csn; 362 return csn; 363 } 364 365 /* 366 * Read one tag from stream. 367 */ 368 static int __init isapnp_read_tag(unsigned char *type, unsigned short *size) 369 { 370 unsigned char tag, tmp[2]; 371 372 isapnp_peek(&tag, 1); 373 if (tag == 0) /* invalid tag */ 374 return -1; 375 if (tag & 0x80) { /* large item */ 376 *type = tag; 377 isapnp_peek(tmp, 2); 378 *size = (tmp[1] << 8) | tmp[0]; 379 } else { 380 *type = (tag >> 3) & 0x0f; 381 *size = tag & 0x07; 382 } 383 #if 0 384 printk(KERN_DEBUG "tag = 0x%x, type = 0x%x, size = %i\n", tag, *type, 385 *size); 386 #endif 387 if (*type == 0xff && *size == 0xffff) /* probably invalid data */ 388 return -1; 389 return 0; 390 } 391 392 /* 393 * Skip specified number of bytes from stream. 394 */ 395 static void __init isapnp_skip_bytes(int count) 396 { 397 isapnp_peek(NULL, count); 398 } 399 400 /* 401 * Parse logical device tag. 402 */ 403 static struct pnp_dev *__init isapnp_parse_device(struct pnp_card *card, 404 int size, int number) 405 { 406 unsigned char tmp[6]; 407 struct pnp_dev *dev; 408 u32 eisa_id; 409 char id[8]; 410 411 isapnp_peek(tmp, size); 412 eisa_id = tmp[0] | tmp[1] << 8 | tmp[2] << 16 | tmp[3] << 24; 413 pnp_eisa_id_to_string(eisa_id, id); 414 415 dev = pnp_alloc_dev(&isapnp_protocol, number, id); 416 if (!dev) 417 return NULL; 418 419 dev->regs = tmp[4]; 420 dev->card = card; 421 if (size > 5) 422 dev->regs |= tmp[5] << 8; 423 dev->capabilities |= PNP_CONFIGURABLE; 424 dev->capabilities |= PNP_READ; 425 dev->capabilities |= PNP_WRITE; 426 dev->capabilities |= PNP_DISABLE; 427 pnp_init_resource_table(&dev->res); 428 return dev; 429 } 430 431 /* 432 * Add IRQ resource to resources list. 433 */ 434 static void __init isapnp_parse_irq_resource(struct pnp_option *option, 435 int size) 436 { 437 unsigned char tmp[3]; 438 struct pnp_irq *irq; 439 unsigned long bits; 440 441 isapnp_peek(tmp, size); 442 irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL); 443 if (!irq) 444 return; 445 bits = (tmp[1] << 8) | tmp[0]; 446 bitmap_copy(irq->map, &bits, 16); 447 if (size > 2) 448 irq->flags = tmp[2]; 449 else 450 irq->flags = IORESOURCE_IRQ_HIGHEDGE; 451 pnp_register_irq_resource(option, irq); 452 } 453 454 /* 455 * Add DMA resource to resources list. 456 */ 457 static void __init isapnp_parse_dma_resource(struct pnp_option *option, 458 int size) 459 { 460 unsigned char tmp[2]; 461 struct pnp_dma *dma; 462 463 isapnp_peek(tmp, size); 464 dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL); 465 if (!dma) 466 return; 467 dma->map = tmp[0]; 468 dma->flags = tmp[1]; 469 pnp_register_dma_resource(option, dma); 470 } 471 472 /* 473 * Add port resource to resources list. 474 */ 475 static void __init isapnp_parse_port_resource(struct pnp_option *option, 476 int size) 477 { 478 unsigned char tmp[7]; 479 struct pnp_port *port; 480 481 isapnp_peek(tmp, size); 482 port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL); 483 if (!port) 484 return; 485 port->min = (tmp[2] << 8) | tmp[1]; 486 port->max = (tmp[4] << 8) | tmp[3]; 487 port->align = tmp[5]; 488 port->size = tmp[6]; 489 port->flags = tmp[0] ? PNP_PORT_FLAG_16BITADDR : 0; 490 pnp_register_port_resource(option, port); 491 } 492 493 /* 494 * Add fixed port resource to resources list. 495 */ 496 static void __init isapnp_parse_fixed_port_resource(struct pnp_option *option, 497 int size) 498 { 499 unsigned char tmp[3]; 500 struct pnp_port *port; 501 502 isapnp_peek(tmp, size); 503 port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL); 504 if (!port) 505 return; 506 port->min = port->max = (tmp[1] << 8) | tmp[0]; 507 port->size = tmp[2]; 508 port->align = 0; 509 port->flags = PNP_PORT_FLAG_FIXED; 510 pnp_register_port_resource(option, port); 511 } 512 513 /* 514 * Add memory resource to resources list. 515 */ 516 static void __init isapnp_parse_mem_resource(struct pnp_option *option, 517 int size) 518 { 519 unsigned char tmp[9]; 520 struct pnp_mem *mem; 521 522 isapnp_peek(tmp, size); 523 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL); 524 if (!mem) 525 return; 526 mem->min = ((tmp[2] << 8) | tmp[1]) << 8; 527 mem->max = ((tmp[4] << 8) | tmp[3]) << 8; 528 mem->align = (tmp[6] << 8) | tmp[5]; 529 mem->size = ((tmp[8] << 8) | tmp[7]) << 8; 530 mem->flags = tmp[0]; 531 pnp_register_mem_resource(option, mem); 532 } 533 534 /* 535 * Add 32-bit memory resource to resources list. 536 */ 537 static void __init isapnp_parse_mem32_resource(struct pnp_option *option, 538 int size) 539 { 540 unsigned char tmp[17]; 541 struct pnp_mem *mem; 542 543 isapnp_peek(tmp, size); 544 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL); 545 if (!mem) 546 return; 547 mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 548 mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 549 mem->align = 550 (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9]; 551 mem->size = 552 (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13]; 553 mem->flags = tmp[0]; 554 pnp_register_mem_resource(option, mem); 555 } 556 557 /* 558 * Add 32-bit fixed memory resource to resources list. 559 */ 560 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_option *option, 561 int size) 562 { 563 unsigned char tmp[9]; 564 struct pnp_mem *mem; 565 566 isapnp_peek(tmp, size); 567 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL); 568 if (!mem) 569 return; 570 mem->min = mem->max = 571 (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 572 mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 573 mem->align = 0; 574 mem->flags = tmp[0]; 575 pnp_register_mem_resource(option, mem); 576 } 577 578 /* 579 * Parse card name for ISA PnP device. 580 */ 581 static void __init 582 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size) 583 { 584 if (name[0] == '\0') { 585 unsigned short size1 = 586 *size >= name_max ? (name_max - 1) : *size; 587 isapnp_peek(name, size1); 588 name[size1] = '\0'; 589 *size -= size1; 590 591 /* clean whitespace from end of string */ 592 while (size1 > 0 && name[--size1] == ' ') 593 name[size1] = '\0'; 594 } 595 } 596 597 /* 598 * Parse resource map for logical device. 599 */ 600 static int __init isapnp_create_device(struct pnp_card *card, 601 unsigned short size) 602 { 603 int number = 0, skip = 0, priority = 0, compat = 0; 604 unsigned char type, tmp[17]; 605 struct pnp_option *option; 606 struct pnp_dev *dev; 607 u32 eisa_id; 608 char id[8]; 609 610 if ((dev = isapnp_parse_device(card, size, number++)) == NULL) 611 return 1; 612 option = pnp_register_independent_option(dev); 613 if (!option) { 614 kfree(dev); 615 return 1; 616 } 617 pnp_add_card_device(card, dev); 618 619 while (1) { 620 if (isapnp_read_tag(&type, &size) < 0) 621 return 1; 622 if (skip && type != _STAG_LOGDEVID && type != _STAG_END) 623 goto __skip; 624 switch (type) { 625 case _STAG_LOGDEVID: 626 if (size >= 5 && size <= 6) { 627 if ((dev = 628 isapnp_parse_device(card, size, 629 number++)) == NULL) 630 return 1; 631 size = 0; 632 skip = 0; 633 option = pnp_register_independent_option(dev); 634 if (!option) { 635 kfree(dev); 636 return 1; 637 } 638 pnp_add_card_device(card, dev); 639 } else { 640 skip = 1; 641 } 642 priority = 0; 643 compat = 0; 644 break; 645 case _STAG_COMPATDEVID: 646 if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) { 647 isapnp_peek(tmp, 4); 648 eisa_id = tmp[0] | tmp[1] << 8 | 649 tmp[2] << 16 | tmp[3] << 24; 650 pnp_eisa_id_to_string(eisa_id, id); 651 pnp_add_id(dev, id); 652 compat++; 653 size = 0; 654 } 655 break; 656 case _STAG_IRQ: 657 if (size < 2 || size > 3) 658 goto __skip; 659 isapnp_parse_irq_resource(option, size); 660 size = 0; 661 break; 662 case _STAG_DMA: 663 if (size != 2) 664 goto __skip; 665 isapnp_parse_dma_resource(option, size); 666 size = 0; 667 break; 668 case _STAG_STARTDEP: 669 if (size > 1) 670 goto __skip; 671 priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE; 672 if (size > 0) { 673 isapnp_peek(tmp, size); 674 priority = 0x100 | tmp[0]; 675 size = 0; 676 } 677 option = pnp_register_dependent_option(dev, priority); 678 if (!option) 679 return 1; 680 break; 681 case _STAG_ENDDEP: 682 if (size != 0) 683 goto __skip; 684 priority = 0; 685 break; 686 case _STAG_IOPORT: 687 if (size != 7) 688 goto __skip; 689 isapnp_parse_port_resource(option, size); 690 size = 0; 691 break; 692 case _STAG_FIXEDIO: 693 if (size != 3) 694 goto __skip; 695 isapnp_parse_fixed_port_resource(option, size); 696 size = 0; 697 break; 698 case _STAG_VENDOR: 699 break; 700 case _LTAG_MEMRANGE: 701 if (size != 9) 702 goto __skip; 703 isapnp_parse_mem_resource(option, size); 704 size = 0; 705 break; 706 case _LTAG_ANSISTR: 707 isapnp_parse_name(dev->name, sizeof(dev->name), &size); 708 break; 709 case _LTAG_UNICODESTR: 710 /* silently ignore */ 711 /* who use unicode for hardware identification? */ 712 break; 713 case _LTAG_VENDOR: 714 break; 715 case _LTAG_MEM32RANGE: 716 if (size != 17) 717 goto __skip; 718 isapnp_parse_mem32_resource(option, size); 719 size = 0; 720 break; 721 case _LTAG_FIXEDMEM32RANGE: 722 if (size != 9) 723 goto __skip; 724 isapnp_parse_fixed_mem32_resource(option, size); 725 size = 0; 726 break; 727 case _STAG_END: 728 if (size > 0) 729 isapnp_skip_bytes(size); 730 return 1; 731 default: 732 printk(KERN_ERR 733 "isapnp: unexpected or unknown tag type 0x%x for logical device %i (device %i), ignored\n", 734 type, dev->number, card->number); 735 } 736 __skip: 737 if (size > 0) 738 isapnp_skip_bytes(size); 739 } 740 return 0; 741 } 742 743 /* 744 * Parse resource map for ISA PnP card. 745 */ 746 static void __init isapnp_parse_resource_map(struct pnp_card *card) 747 { 748 unsigned char type, tmp[17]; 749 unsigned short size; 750 751 while (1) { 752 if (isapnp_read_tag(&type, &size) < 0) 753 return; 754 switch (type) { 755 case _STAG_PNPVERNO: 756 if (size != 2) 757 goto __skip; 758 isapnp_peek(tmp, 2); 759 card->pnpver = tmp[0]; 760 card->productver = tmp[1]; 761 size = 0; 762 break; 763 case _STAG_LOGDEVID: 764 if (size >= 5 && size <= 6) { 765 if (isapnp_create_device(card, size) == 1) 766 return; 767 size = 0; 768 } 769 break; 770 case _STAG_VENDOR: 771 break; 772 case _LTAG_ANSISTR: 773 isapnp_parse_name(card->name, sizeof(card->name), 774 &size); 775 break; 776 case _LTAG_UNICODESTR: 777 /* silently ignore */ 778 /* who use unicode for hardware identification? */ 779 break; 780 case _LTAG_VENDOR: 781 break; 782 case _STAG_END: 783 if (size > 0) 784 isapnp_skip_bytes(size); 785 return; 786 default: 787 printk(KERN_ERR 788 "isapnp: unexpected or unknown tag type 0x%x for device %i, ignored\n", 789 type, card->number); 790 } 791 __skip: 792 if (size > 0) 793 isapnp_skip_bytes(size); 794 } 795 } 796 797 /* 798 * Compute ISA PnP checksum for first eight bytes. 799 */ 800 static unsigned char __init isapnp_checksum(unsigned char *data) 801 { 802 int i, j; 803 unsigned char checksum = 0x6a, bit, b; 804 805 for (i = 0; i < 8; i++) { 806 b = data[i]; 807 for (j = 0; j < 8; j++) { 808 bit = 0; 809 if (b & (1 << j)) 810 bit = 1; 811 checksum = 812 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) 813 | (checksum >> 1); 814 } 815 } 816 return checksum; 817 } 818 819 /* 820 * Build device list for all present ISA PnP devices. 821 */ 822 static int __init isapnp_build_device_list(void) 823 { 824 int csn; 825 unsigned char header[9], checksum; 826 struct pnp_card *card; 827 u32 eisa_id; 828 char id[8]; 829 830 isapnp_wait(); 831 isapnp_key(); 832 for (csn = 1; csn <= isapnp_csn_count; csn++) { 833 isapnp_wake(csn); 834 isapnp_peek(header, 9); 835 checksum = isapnp_checksum(header); 836 #if 0 837 printk(KERN_DEBUG 838 "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 839 header[0], header[1], header[2], header[3], header[4], 840 header[5], header[6], header[7], header[8]); 841 printk(KERN_DEBUG "checksum = 0x%x\n", checksum); 842 #endif 843 eisa_id = header[0] | header[1] << 8 | 844 header[2] << 16 | header[3] << 24; 845 pnp_eisa_id_to_string(eisa_id, id); 846 card = pnp_alloc_card(&isapnp_protocol, csn, id); 847 if (!card) 848 continue; 849 850 INIT_LIST_HEAD(&card->devices); 851 card->serial = 852 (header[7] << 24) | (header[6] << 16) | (header[5] << 8) | 853 header[4]; 854 isapnp_checksum_value = 0x00; 855 isapnp_parse_resource_map(card); 856 if (isapnp_checksum_value != 0x00) 857 printk(KERN_ERR 858 "isapnp: checksum for device %i is not valid (0x%x)\n", 859 csn, isapnp_checksum_value); 860 card->checksum = isapnp_checksum_value; 861 862 pnp_add_card(card); 863 } 864 isapnp_wait(); 865 return 0; 866 } 867 868 /* 869 * Basic configuration routines. 870 */ 871 872 int isapnp_present(void) 873 { 874 struct pnp_card *card; 875 876 pnp_for_each_card(card) { 877 if (card->protocol == &isapnp_protocol) 878 return 1; 879 } 880 return 0; 881 } 882 883 int isapnp_cfg_begin(int csn, int logdev) 884 { 885 if (csn < 1 || csn > isapnp_csn_count || logdev > 10) 886 return -EINVAL; 887 mutex_lock(&isapnp_cfg_mutex); 888 isapnp_wait(); 889 isapnp_key(); 890 isapnp_wake(csn); 891 #if 0 892 /* to avoid malfunction when the isapnptools package is used */ 893 /* we must set RDP to our value again */ 894 /* it is possible to set RDP only in the isolation phase */ 895 /* Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */ 896 isapnp_write_byte(0x02, 0x04); /* clear CSN of card */ 897 mdelay(2); /* is this necessary? */ 898 isapnp_wake(csn); /* bring card into sleep state */ 899 isapnp_wake(0); /* bring card into isolation state */ 900 isapnp_set_rdp(); /* reset the RDP port */ 901 udelay(1000); /* delay 1000us */ 902 isapnp_write_byte(0x06, csn); /* reset CSN to previous value */ 903 udelay(250); /* is this necessary? */ 904 #endif 905 if (logdev >= 0) 906 isapnp_device(logdev); 907 return 0; 908 } 909 910 int isapnp_cfg_end(void) 911 { 912 isapnp_wait(); 913 mutex_unlock(&isapnp_cfg_mutex); 914 return 0; 915 } 916 917 /* 918 * Initialization. 919 */ 920 921 EXPORT_SYMBOL(isapnp_protocol); 922 EXPORT_SYMBOL(isapnp_present); 923 EXPORT_SYMBOL(isapnp_cfg_begin); 924 EXPORT_SYMBOL(isapnp_cfg_end); 925 EXPORT_SYMBOL(isapnp_write_byte); 926 927 static int isapnp_read_resources(struct pnp_dev *dev, 928 struct pnp_resource_table *res) 929 { 930 int tmp, ret; 931 932 dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE); 933 if (dev->active) { 934 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) { 935 ret = isapnp_read_word(ISAPNP_CFG_PORT + (tmp << 1)); 936 if (!ret) 937 continue; 938 res->port_resource[tmp].start = ret; 939 res->port_resource[tmp].flags = IORESOURCE_IO; 940 } 941 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) { 942 ret = 943 isapnp_read_word(ISAPNP_CFG_MEM + (tmp << 3)) << 8; 944 if (!ret) 945 continue; 946 res->mem_resource[tmp].start = ret; 947 res->mem_resource[tmp].flags = IORESOURCE_MEM; 948 } 949 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) { 950 ret = 951 (isapnp_read_word(ISAPNP_CFG_IRQ + (tmp << 1)) >> 952 8); 953 if (!ret) 954 continue; 955 res->irq_resource[tmp].start = 956 res->irq_resource[tmp].end = ret; 957 res->irq_resource[tmp].flags = IORESOURCE_IRQ; 958 } 959 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) { 960 ret = isapnp_read_byte(ISAPNP_CFG_DMA + tmp); 961 if (ret == 4) 962 continue; 963 res->dma_resource[tmp].start = 964 res->dma_resource[tmp].end = ret; 965 res->dma_resource[tmp].flags = IORESOURCE_DMA; 966 } 967 } 968 return 0; 969 } 970 971 static int isapnp_get_resources(struct pnp_dev *dev, 972 struct pnp_resource_table *res) 973 { 974 int ret; 975 976 pnp_init_resource_table(res); 977 isapnp_cfg_begin(dev->card->number, dev->number); 978 ret = isapnp_read_resources(dev, res); 979 isapnp_cfg_end(); 980 return ret; 981 } 982 983 static int isapnp_set_resources(struct pnp_dev *dev, 984 struct pnp_resource_table *res) 985 { 986 int tmp; 987 988 isapnp_cfg_begin(dev->card->number, dev->number); 989 dev->active = 1; 990 for (tmp = 0; 991 tmp < ISAPNP_MAX_PORT 992 && (res->port_resource[tmp]. 993 flags & (IORESOURCE_IO | IORESOURCE_UNSET)) == IORESOURCE_IO; 994 tmp++) 995 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1), 996 res->port_resource[tmp].start); 997 for (tmp = 0; 998 tmp < ISAPNP_MAX_IRQ 999 && (res->irq_resource[tmp]. 1000 flags & (IORESOURCE_IRQ | IORESOURCE_UNSET)) == IORESOURCE_IRQ; 1001 tmp++) { 1002 int irq = res->irq_resource[tmp].start; 1003 if (irq == 2) 1004 irq = 9; 1005 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq); 1006 } 1007 for (tmp = 0; 1008 tmp < ISAPNP_MAX_DMA 1009 && (res->dma_resource[tmp]. 1010 flags & (IORESOURCE_DMA | IORESOURCE_UNSET)) == IORESOURCE_DMA; 1011 tmp++) 1012 isapnp_write_byte(ISAPNP_CFG_DMA + tmp, 1013 res->dma_resource[tmp].start); 1014 for (tmp = 0; 1015 tmp < ISAPNP_MAX_MEM 1016 && (res->mem_resource[tmp]. 1017 flags & (IORESOURCE_MEM | IORESOURCE_UNSET)) == IORESOURCE_MEM; 1018 tmp++) 1019 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3), 1020 (res->mem_resource[tmp].start >> 8) & 0xffff); 1021 /* FIXME: We aren't handling 32bit mems properly here */ 1022 isapnp_activate(dev->number); 1023 isapnp_cfg_end(); 1024 return 0; 1025 } 1026 1027 static int isapnp_disable_resources(struct pnp_dev *dev) 1028 { 1029 if (!dev->active) 1030 return -EINVAL; 1031 isapnp_cfg_begin(dev->card->number, dev->number); 1032 isapnp_deactivate(dev->number); 1033 dev->active = 0; 1034 isapnp_cfg_end(); 1035 return 0; 1036 } 1037 1038 struct pnp_protocol isapnp_protocol = { 1039 .name = "ISA Plug and Play", 1040 .get = isapnp_get_resources, 1041 .set = isapnp_set_resources, 1042 .disable = isapnp_disable_resources, 1043 }; 1044 1045 static int __init isapnp_init(void) 1046 { 1047 int cards; 1048 struct pnp_card *card; 1049 struct pnp_dev *dev; 1050 1051 if (isapnp_disable) { 1052 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n"); 1053 return 0; 1054 } 1055 #ifdef CONFIG_PPC_MERGE 1056 if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP)) 1057 return -EINVAL; 1058 #endif 1059 #ifdef ISAPNP_REGION_OK 1060 if (!request_region(_PIDXR, 1, "isapnp index")) { 1061 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n", 1062 _PIDXR); 1063 return -EBUSY; 1064 } 1065 #endif 1066 if (!request_region(_PNPWRP, 1, "isapnp write")) { 1067 printk(KERN_ERR 1068 "isapnp: Write Data Register 0x%x already used\n", 1069 _PNPWRP); 1070 #ifdef ISAPNP_REGION_OK 1071 release_region(_PIDXR, 1); 1072 #endif 1073 return -EBUSY; 1074 } 1075 1076 if (pnp_register_protocol(&isapnp_protocol) < 0) 1077 return -EBUSY; 1078 1079 /* 1080 * Print a message. The existing ISAPnP code is hanging machines 1081 * so let the user know where. 1082 */ 1083 1084 printk(KERN_INFO "isapnp: Scanning for PnP cards...\n"); 1085 if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) { 1086 isapnp_rdp |= 3; 1087 if (!request_region(isapnp_rdp, 1, "isapnp read")) { 1088 printk(KERN_ERR 1089 "isapnp: Read Data Register 0x%x already used\n", 1090 isapnp_rdp); 1091 #ifdef ISAPNP_REGION_OK 1092 release_region(_PIDXR, 1); 1093 #endif 1094 release_region(_PNPWRP, 1); 1095 return -EBUSY; 1096 } 1097 isapnp_set_rdp(); 1098 } 1099 if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) { 1100 cards = isapnp_isolate(); 1101 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) { 1102 #ifdef ISAPNP_REGION_OK 1103 release_region(_PIDXR, 1); 1104 #endif 1105 release_region(_PNPWRP, 1); 1106 printk(KERN_INFO 1107 "isapnp: No Plug & Play device found\n"); 1108 return 0; 1109 } 1110 request_region(isapnp_rdp, 1, "isapnp read"); 1111 } 1112 isapnp_build_device_list(); 1113 cards = 0; 1114 1115 protocol_for_each_card(&isapnp_protocol, card) { 1116 cards++; 1117 if (isapnp_verbose) { 1118 printk(KERN_INFO "isapnp: Card '%s'\n", 1119 card->name[0] ? card->name : "Unknown"); 1120 if (isapnp_verbose < 2) 1121 continue; 1122 card_for_each_dev(card, dev) { 1123 printk(KERN_INFO "isapnp: Device '%s'\n", 1124 dev->name[0] ? dev->name : "Unknown"); 1125 } 1126 } 1127 } 1128 if (cards) 1129 printk(KERN_INFO 1130 "isapnp: %i Plug & Play card%s detected total\n", cards, 1131 cards > 1 ? "s" : ""); 1132 else 1133 printk(KERN_INFO "isapnp: No Plug & Play card found\n"); 1134 1135 isapnp_proc_init(); 1136 return 0; 1137 } 1138 1139 device_initcall(isapnp_init); 1140 1141 /* format is: noisapnp */ 1142 1143 static int __init isapnp_setup_disable(char *str) 1144 { 1145 isapnp_disable = 1; 1146 return 1; 1147 } 1148 1149 __setup("noisapnp", isapnp_setup_disable); 1150 1151 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */ 1152 1153 static int __init isapnp_setup_isapnp(char *str) 1154 { 1155 (void)((get_option(&str, &isapnp_rdp) == 2) && 1156 (get_option(&str, &isapnp_reset) == 2) && 1157 (get_option(&str, &isapnp_verbose) == 2)); 1158 return 1; 1159 } 1160 1161 __setup("isapnp=", isapnp_setup_isapnp); 1162