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 struct pnp_option *option, 433 int size) 434 { 435 unsigned char tmp[3]; 436 struct pnp_irq *irq; 437 unsigned long bits; 438 439 isapnp_peek(tmp, size); 440 irq = kzalloc(sizeof(struct pnp_irq), GFP_KERNEL); 441 if (!irq) 442 return; 443 bits = (tmp[1] << 8) | tmp[0]; 444 bitmap_copy(irq->map, &bits, 16); 445 if (size > 2) 446 irq->flags = tmp[2]; 447 else 448 irq->flags = IORESOURCE_IRQ_HIGHEDGE; 449 pnp_register_irq_resource(dev, option, irq); 450 } 451 452 /* 453 * Add DMA resource to resources list. 454 */ 455 static void __init isapnp_parse_dma_resource(struct pnp_dev *dev, 456 struct pnp_option *option, 457 int size) 458 { 459 unsigned char tmp[2]; 460 struct pnp_dma *dma; 461 462 isapnp_peek(tmp, size); 463 dma = kzalloc(sizeof(struct pnp_dma), GFP_KERNEL); 464 if (!dma) 465 return; 466 dma->map = tmp[0]; 467 dma->flags = tmp[1]; 468 pnp_register_dma_resource(dev, option, dma); 469 } 470 471 /* 472 * Add port resource to resources list. 473 */ 474 static void __init isapnp_parse_port_resource(struct pnp_dev *dev, 475 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(dev, 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_dev *dev, 497 struct pnp_option *option, 498 int size) 499 { 500 unsigned char tmp[3]; 501 struct pnp_port *port; 502 503 isapnp_peek(tmp, size); 504 port = kzalloc(sizeof(struct pnp_port), GFP_KERNEL); 505 if (!port) 506 return; 507 port->min = port->max = (tmp[1] << 8) | tmp[0]; 508 port->size = tmp[2]; 509 port->align = 0; 510 port->flags = PNP_PORT_FLAG_FIXED; 511 pnp_register_port_resource(dev, option, port); 512 } 513 514 /* 515 * Add memory resource to resources list. 516 */ 517 static void __init isapnp_parse_mem_resource(struct pnp_dev *dev, 518 struct pnp_option *option, 519 int size) 520 { 521 unsigned char tmp[9]; 522 struct pnp_mem *mem; 523 524 isapnp_peek(tmp, size); 525 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL); 526 if (!mem) 527 return; 528 mem->min = ((tmp[2] << 8) | tmp[1]) << 8; 529 mem->max = ((tmp[4] << 8) | tmp[3]) << 8; 530 mem->align = (tmp[6] << 8) | tmp[5]; 531 mem->size = ((tmp[8] << 8) | tmp[7]) << 8; 532 mem->flags = tmp[0]; 533 pnp_register_mem_resource(dev, option, mem); 534 } 535 536 /* 537 * Add 32-bit memory resource to resources list. 538 */ 539 static void __init isapnp_parse_mem32_resource(struct pnp_dev *dev, 540 struct pnp_option *option, 541 int size) 542 { 543 unsigned char tmp[17]; 544 struct pnp_mem *mem; 545 546 isapnp_peek(tmp, size); 547 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL); 548 if (!mem) 549 return; 550 mem->min = (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 551 mem->max = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 552 mem->align = 553 (tmp[12] << 24) | (tmp[11] << 16) | (tmp[10] << 8) | tmp[9]; 554 mem->size = 555 (tmp[16] << 24) | (tmp[15] << 16) | (tmp[14] << 8) | tmp[13]; 556 mem->flags = tmp[0]; 557 pnp_register_mem_resource(dev, option, mem); 558 } 559 560 /* 561 * Add 32-bit fixed memory resource to resources list. 562 */ 563 static void __init isapnp_parse_fixed_mem32_resource(struct pnp_dev *dev, 564 struct pnp_option *option, 565 int size) 566 { 567 unsigned char tmp[9]; 568 struct pnp_mem *mem; 569 570 isapnp_peek(tmp, size); 571 mem = kzalloc(sizeof(struct pnp_mem), GFP_KERNEL); 572 if (!mem) 573 return; 574 mem->min = mem->max = 575 (tmp[4] << 24) | (tmp[3] << 16) | (tmp[2] << 8) | tmp[1]; 576 mem->size = (tmp[8] << 24) | (tmp[7] << 16) | (tmp[6] << 8) | tmp[5]; 577 mem->align = 0; 578 mem->flags = tmp[0]; 579 pnp_register_mem_resource(dev, option, mem); 580 } 581 582 /* 583 * Parse card name for ISA PnP device. 584 */ 585 static void __init 586 isapnp_parse_name(char *name, unsigned int name_max, unsigned short *size) 587 { 588 if (name[0] == '\0') { 589 unsigned short size1 = 590 *size >= name_max ? (name_max - 1) : *size; 591 isapnp_peek(name, size1); 592 name[size1] = '\0'; 593 *size -= size1; 594 595 /* clean whitespace from end of string */ 596 while (size1 > 0 && name[--size1] == ' ') 597 name[size1] = '\0'; 598 } 599 } 600 601 /* 602 * Parse resource map for logical device. 603 */ 604 static int __init isapnp_create_device(struct pnp_card *card, 605 unsigned short size) 606 { 607 int number = 0, skip = 0, priority = 0, compat = 0; 608 unsigned char type, tmp[17]; 609 struct pnp_option *option; 610 struct pnp_dev *dev; 611 u32 eisa_id; 612 char id[8]; 613 614 if ((dev = isapnp_parse_device(card, size, number++)) == NULL) 615 return 1; 616 option = pnp_register_independent_option(dev); 617 if (!option) { 618 kfree(dev); 619 return 1; 620 } 621 pnp_add_card_device(card, dev); 622 623 while (1) { 624 if (isapnp_read_tag(&type, &size) < 0) 625 return 1; 626 if (skip && type != _STAG_LOGDEVID && type != _STAG_END) 627 goto __skip; 628 switch (type) { 629 case _STAG_LOGDEVID: 630 if (size >= 5 && size <= 6) { 631 if ((dev = 632 isapnp_parse_device(card, size, 633 number++)) == NULL) 634 return 1; 635 size = 0; 636 skip = 0; 637 option = pnp_register_independent_option(dev); 638 if (!option) { 639 kfree(dev); 640 return 1; 641 } 642 pnp_add_card_device(card, dev); 643 } else { 644 skip = 1; 645 } 646 priority = 0; 647 compat = 0; 648 break; 649 case _STAG_COMPATDEVID: 650 if (size == 4 && compat < DEVICE_COUNT_COMPATIBLE) { 651 isapnp_peek(tmp, 4); 652 eisa_id = tmp[0] | tmp[1] << 8 | 653 tmp[2] << 16 | tmp[3] << 24; 654 pnp_eisa_id_to_string(eisa_id, id); 655 pnp_add_id(dev, id); 656 compat++; 657 size = 0; 658 } 659 break; 660 case _STAG_IRQ: 661 if (size < 2 || size > 3) 662 goto __skip; 663 isapnp_parse_irq_resource(dev, option, size); 664 size = 0; 665 break; 666 case _STAG_DMA: 667 if (size != 2) 668 goto __skip; 669 isapnp_parse_dma_resource(dev, option, size); 670 size = 0; 671 break; 672 case _STAG_STARTDEP: 673 if (size > 1) 674 goto __skip; 675 priority = 0x100 | PNP_RES_PRIORITY_ACCEPTABLE; 676 if (size > 0) { 677 isapnp_peek(tmp, size); 678 priority = 0x100 | tmp[0]; 679 size = 0; 680 } 681 option = pnp_register_dependent_option(dev, priority); 682 if (!option) 683 return 1; 684 break; 685 case _STAG_ENDDEP: 686 if (size != 0) 687 goto __skip; 688 priority = 0; 689 dev_dbg(&dev->dev, "end dependent options\n"); 690 break; 691 case _STAG_IOPORT: 692 if (size != 7) 693 goto __skip; 694 isapnp_parse_port_resource(dev, option, size); 695 size = 0; 696 break; 697 case _STAG_FIXEDIO: 698 if (size != 3) 699 goto __skip; 700 isapnp_parse_fixed_port_resource(dev, option, size); 701 size = 0; 702 break; 703 case _STAG_VENDOR: 704 break; 705 case _LTAG_MEMRANGE: 706 if (size != 9) 707 goto __skip; 708 isapnp_parse_mem_resource(dev, option, size); 709 size = 0; 710 break; 711 case _LTAG_ANSISTR: 712 isapnp_parse_name(dev->name, sizeof(dev->name), &size); 713 break; 714 case _LTAG_UNICODESTR: 715 /* silently ignore */ 716 /* who use unicode for hardware identification? */ 717 break; 718 case _LTAG_VENDOR: 719 break; 720 case _LTAG_MEM32RANGE: 721 if (size != 17) 722 goto __skip; 723 isapnp_parse_mem32_resource(dev, option, size); 724 size = 0; 725 break; 726 case _LTAG_FIXEDMEM32RANGE: 727 if (size != 9) 728 goto __skip; 729 isapnp_parse_fixed_mem32_resource(dev, option, size); 730 size = 0; 731 break; 732 case _STAG_END: 733 if (size > 0) 734 isapnp_skip_bytes(size); 735 return 1; 736 default: 737 dev_err(&dev->dev, "unknown tag %#x (card %i), " 738 "ignored\n", type, card->number); 739 } 740 __skip: 741 if (size > 0) 742 isapnp_skip_bytes(size); 743 } 744 return 0; 745 } 746 747 /* 748 * Parse resource map for ISA PnP card. 749 */ 750 static void __init isapnp_parse_resource_map(struct pnp_card *card) 751 { 752 unsigned char type, tmp[17]; 753 unsigned short size; 754 755 while (1) { 756 if (isapnp_read_tag(&type, &size) < 0) 757 return; 758 switch (type) { 759 case _STAG_PNPVERNO: 760 if (size != 2) 761 goto __skip; 762 isapnp_peek(tmp, 2); 763 card->pnpver = tmp[0]; 764 card->productver = tmp[1]; 765 size = 0; 766 break; 767 case _STAG_LOGDEVID: 768 if (size >= 5 && size <= 6) { 769 if (isapnp_create_device(card, size) == 1) 770 return; 771 size = 0; 772 } 773 break; 774 case _STAG_VENDOR: 775 break; 776 case _LTAG_ANSISTR: 777 isapnp_parse_name(card->name, sizeof(card->name), 778 &size); 779 break; 780 case _LTAG_UNICODESTR: 781 /* silently ignore */ 782 /* who use unicode for hardware identification? */ 783 break; 784 case _LTAG_VENDOR: 785 break; 786 case _STAG_END: 787 if (size > 0) 788 isapnp_skip_bytes(size); 789 return; 790 default: 791 dev_err(&card->dev, "unknown tag %#x, ignored\n", 792 type); 793 } 794 __skip: 795 if (size > 0) 796 isapnp_skip_bytes(size); 797 } 798 } 799 800 /* 801 * Compute ISA PnP checksum for first eight bytes. 802 */ 803 static unsigned char __init isapnp_checksum(unsigned char *data) 804 { 805 int i, j; 806 unsigned char checksum = 0x6a, bit, b; 807 808 for (i = 0; i < 8; i++) { 809 b = data[i]; 810 for (j = 0; j < 8; j++) { 811 bit = 0; 812 if (b & (1 << j)) 813 bit = 1; 814 checksum = 815 ((((checksum ^ (checksum >> 1)) & 0x01) ^ bit) << 7) 816 | (checksum >> 1); 817 } 818 } 819 return checksum; 820 } 821 822 /* 823 * Build device list for all present ISA PnP devices. 824 */ 825 static int __init isapnp_build_device_list(void) 826 { 827 int csn; 828 unsigned char header[9], checksum; 829 struct pnp_card *card; 830 u32 eisa_id; 831 char id[8]; 832 833 isapnp_wait(); 834 isapnp_key(); 835 for (csn = 1; csn <= isapnp_csn_count; csn++) { 836 isapnp_wake(csn); 837 isapnp_peek(header, 9); 838 checksum = isapnp_checksum(header); 839 eisa_id = header[0] | header[1] << 8 | 840 header[2] << 16 | header[3] << 24; 841 pnp_eisa_id_to_string(eisa_id, id); 842 card = pnp_alloc_card(&isapnp_protocol, csn, id); 843 if (!card) 844 continue; 845 846 #if 0 847 dev_info(&card->dev, 848 "vendor: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 849 header[0], header[1], header[2], header[3], header[4], 850 header[5], header[6], header[7], header[8]); 851 dev_info(&card->dev, "checksum = %#x\n", checksum); 852 #endif 853 INIT_LIST_HEAD(&card->devices); 854 card->serial = 855 (header[7] << 24) | (header[6] << 16) | (header[5] << 8) | 856 header[4]; 857 isapnp_checksum_value = 0x00; 858 isapnp_parse_resource_map(card); 859 if (isapnp_checksum_value != 0x00) 860 dev_err(&card->dev, "invalid checksum %#x\n", 861 isapnp_checksum_value); 862 card->checksum = isapnp_checksum_value; 863 864 pnp_add_card(card); 865 } 866 isapnp_wait(); 867 return 0; 868 } 869 870 /* 871 * Basic configuration routines. 872 */ 873 874 int isapnp_present(void) 875 { 876 struct pnp_card *card; 877 878 pnp_for_each_card(card) { 879 if (card->protocol == &isapnp_protocol) 880 return 1; 881 } 882 return 0; 883 } 884 885 int isapnp_cfg_begin(int csn, int logdev) 886 { 887 if (csn < 1 || csn > isapnp_csn_count || logdev > 10) 888 return -EINVAL; 889 mutex_lock(&isapnp_cfg_mutex); 890 isapnp_wait(); 891 isapnp_key(); 892 isapnp_wake(csn); 893 #if 0 894 /* to avoid malfunction when the isapnptools package is used */ 895 /* we must set RDP to our value again */ 896 /* it is possible to set RDP only in the isolation phase */ 897 /* Jens Thoms Toerring <Jens.Toerring@physik.fu-berlin.de> */ 898 isapnp_write_byte(0x02, 0x04); /* clear CSN of card */ 899 mdelay(2); /* is this necessary? */ 900 isapnp_wake(csn); /* bring card into sleep state */ 901 isapnp_wake(0); /* bring card into isolation state */ 902 isapnp_set_rdp(); /* reset the RDP port */ 903 udelay(1000); /* delay 1000us */ 904 isapnp_write_byte(0x06, csn); /* reset CSN to previous value */ 905 udelay(250); /* is this necessary? */ 906 #endif 907 if (logdev >= 0) 908 isapnp_device(logdev); 909 return 0; 910 } 911 912 int isapnp_cfg_end(void) 913 { 914 isapnp_wait(); 915 mutex_unlock(&isapnp_cfg_mutex); 916 return 0; 917 } 918 919 /* 920 * Initialization. 921 */ 922 923 EXPORT_SYMBOL(isapnp_protocol); 924 EXPORT_SYMBOL(isapnp_present); 925 EXPORT_SYMBOL(isapnp_cfg_begin); 926 EXPORT_SYMBOL(isapnp_cfg_end); 927 EXPORT_SYMBOL(isapnp_write_byte); 928 929 static int isapnp_get_resources(struct pnp_dev *dev) 930 { 931 int i, ret; 932 933 dev_dbg(&dev->dev, "get resources\n"); 934 pnp_init_resources(dev); 935 isapnp_cfg_begin(dev->card->number, dev->number); 936 dev->active = isapnp_read_byte(ISAPNP_CFG_ACTIVATE); 937 if (!dev->active) 938 goto __end; 939 940 for (i = 0; i < ISAPNP_MAX_PORT; i++) { 941 ret = isapnp_read_word(ISAPNP_CFG_PORT + (i << 1)); 942 pnp_add_io_resource(dev, ret, ret, 943 ret == 0 ? IORESOURCE_DISABLED : 0); 944 } 945 for (i = 0; i < ISAPNP_MAX_MEM; i++) { 946 ret = isapnp_read_word(ISAPNP_CFG_MEM + (i << 3)) << 8; 947 pnp_add_mem_resource(dev, ret, ret, 948 ret == 0 ? IORESOURCE_DISABLED : 0); 949 } 950 for (i = 0; i < ISAPNP_MAX_IRQ; i++) { 951 ret = isapnp_read_word(ISAPNP_CFG_IRQ + (i << 1)) >> 8; 952 pnp_add_irq_resource(dev, ret, 953 ret == 0 ? IORESOURCE_DISABLED : 0); 954 } 955 for (i = 0; i < ISAPNP_MAX_DMA; i++) { 956 ret = isapnp_read_byte(ISAPNP_CFG_DMA + i); 957 pnp_add_dma_resource(dev, ret, 958 ret == 4 ? IORESOURCE_DISABLED : 0); 959 } 960 961 __end: 962 isapnp_cfg_end(); 963 return 0; 964 } 965 966 static int isapnp_set_resources(struct pnp_dev *dev) 967 { 968 struct resource *res; 969 int tmp; 970 971 dev_dbg(&dev->dev, "set resources\n"); 972 isapnp_cfg_begin(dev->card->number, dev->number); 973 dev->active = 1; 974 for (tmp = 0; tmp < ISAPNP_MAX_PORT; tmp++) { 975 res = pnp_get_resource(dev, IORESOURCE_IO, tmp); 976 if (pnp_resource_enabled(res)) { 977 dev_dbg(&dev->dev, " set io %d to %#llx\n", 978 tmp, (unsigned long long) res->start); 979 isapnp_write_word(ISAPNP_CFG_PORT + (tmp << 1), 980 res->start); 981 } 982 } 983 for (tmp = 0; tmp < ISAPNP_MAX_IRQ; tmp++) { 984 res = pnp_get_resource(dev, IORESOURCE_IRQ, tmp); 985 if (pnp_resource_enabled(res)) { 986 int irq = res->start; 987 if (irq == 2) 988 irq = 9; 989 dev_dbg(&dev->dev, " set irq %d to %d\n", tmp, irq); 990 isapnp_write_byte(ISAPNP_CFG_IRQ + (tmp << 1), irq); 991 } 992 } 993 for (tmp = 0; tmp < ISAPNP_MAX_DMA; tmp++) { 994 res = pnp_get_resource(dev, IORESOURCE_DMA, tmp); 995 if (pnp_resource_enabled(res)) { 996 dev_dbg(&dev->dev, " set dma %d to %lld\n", 997 tmp, (unsigned long long) res->start); 998 isapnp_write_byte(ISAPNP_CFG_DMA + tmp, res->start); 999 } 1000 } 1001 for (tmp = 0; tmp < ISAPNP_MAX_MEM; tmp++) { 1002 res = pnp_get_resource(dev, IORESOURCE_MEM, tmp); 1003 if (pnp_resource_enabled(res)) { 1004 dev_dbg(&dev->dev, " set mem %d to %#llx\n", 1005 tmp, (unsigned long long) res->start); 1006 isapnp_write_word(ISAPNP_CFG_MEM + (tmp << 3), 1007 (res->start >> 8) & 0xffff); 1008 } 1009 } 1010 /* FIXME: We aren't handling 32bit mems properly here */ 1011 isapnp_activate(dev->number); 1012 isapnp_cfg_end(); 1013 return 0; 1014 } 1015 1016 static int isapnp_disable_resources(struct pnp_dev *dev) 1017 { 1018 if (!dev->active) 1019 return -EINVAL; 1020 isapnp_cfg_begin(dev->card->number, dev->number); 1021 isapnp_deactivate(dev->number); 1022 dev->active = 0; 1023 isapnp_cfg_end(); 1024 return 0; 1025 } 1026 1027 struct pnp_protocol isapnp_protocol = { 1028 .name = "ISA Plug and Play", 1029 .get = isapnp_get_resources, 1030 .set = isapnp_set_resources, 1031 .disable = isapnp_disable_resources, 1032 }; 1033 1034 static int __init isapnp_init(void) 1035 { 1036 int cards; 1037 struct pnp_card *card; 1038 struct pnp_dev *dev; 1039 1040 if (isapnp_disable) { 1041 printk(KERN_INFO "isapnp: ISA Plug & Play support disabled\n"); 1042 return 0; 1043 } 1044 #ifdef CONFIG_PPC_MERGE 1045 if (check_legacy_ioport(_PIDXR) || check_legacy_ioport(_PNPWRP)) 1046 return -EINVAL; 1047 #endif 1048 #ifdef ISAPNP_REGION_OK 1049 if (!request_region(_PIDXR, 1, "isapnp index")) { 1050 printk(KERN_ERR "isapnp: Index Register 0x%x already used\n", 1051 _PIDXR); 1052 return -EBUSY; 1053 } 1054 #endif 1055 if (!request_region(_PNPWRP, 1, "isapnp write")) { 1056 printk(KERN_ERR 1057 "isapnp: Write Data Register 0x%x already used\n", 1058 _PNPWRP); 1059 #ifdef ISAPNP_REGION_OK 1060 release_region(_PIDXR, 1); 1061 #endif 1062 return -EBUSY; 1063 } 1064 1065 if (pnp_register_protocol(&isapnp_protocol) < 0) 1066 return -EBUSY; 1067 1068 /* 1069 * Print a message. The existing ISAPnP code is hanging machines 1070 * so let the user know where. 1071 */ 1072 1073 printk(KERN_INFO "isapnp: Scanning for PnP cards...\n"); 1074 if (isapnp_rdp >= 0x203 && isapnp_rdp <= 0x3ff) { 1075 isapnp_rdp |= 3; 1076 if (!request_region(isapnp_rdp, 1, "isapnp read")) { 1077 printk(KERN_ERR 1078 "isapnp: Read Data Register 0x%x already used\n", 1079 isapnp_rdp); 1080 #ifdef ISAPNP_REGION_OK 1081 release_region(_PIDXR, 1); 1082 #endif 1083 release_region(_PNPWRP, 1); 1084 return -EBUSY; 1085 } 1086 isapnp_set_rdp(); 1087 } 1088 if (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff) { 1089 cards = isapnp_isolate(); 1090 if (cards < 0 || (isapnp_rdp < 0x203 || isapnp_rdp > 0x3ff)) { 1091 #ifdef ISAPNP_REGION_OK 1092 release_region(_PIDXR, 1); 1093 #endif 1094 release_region(_PNPWRP, 1); 1095 printk(KERN_INFO 1096 "isapnp: No Plug & Play device found\n"); 1097 return 0; 1098 } 1099 request_region(isapnp_rdp, 1, "isapnp read"); 1100 } 1101 isapnp_build_device_list(); 1102 cards = 0; 1103 1104 protocol_for_each_card(&isapnp_protocol, card) { 1105 cards++; 1106 if (isapnp_verbose) { 1107 dev_info(&card->dev, "card '%s'\n", 1108 card->name[0] ? card->name : "unknown"); 1109 if (isapnp_verbose < 2) 1110 continue; 1111 card_for_each_dev(card, dev) { 1112 dev_info(&card->dev, "device '%s'\n", 1113 dev->name[0] ? dev->name : "unknown"); 1114 } 1115 } 1116 } 1117 if (cards) 1118 printk(KERN_INFO 1119 "isapnp: %i Plug & Play card%s detected total\n", cards, 1120 cards > 1 ? "s" : ""); 1121 else 1122 printk(KERN_INFO "isapnp: No Plug & Play card found\n"); 1123 1124 isapnp_proc_init(); 1125 return 0; 1126 } 1127 1128 device_initcall(isapnp_init); 1129 1130 /* format is: noisapnp */ 1131 1132 static int __init isapnp_setup_disable(char *str) 1133 { 1134 isapnp_disable = 1; 1135 return 1; 1136 } 1137 1138 __setup("noisapnp", isapnp_setup_disable); 1139 1140 /* format is: isapnp=rdp,reset,skip_pci_scan,verbose */ 1141 1142 static int __init isapnp_setup_isapnp(char *str) 1143 { 1144 (void)((get_option(&str, &isapnp_rdp) == 2) && 1145 (get_option(&str, &isapnp_reset) == 2) && 1146 (get_option(&str, &isapnp_verbose) == 2)); 1147 return 1; 1148 } 1149 1150 __setup("isapnp=", isapnp_setup_isapnp); 1151