Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * resource.c - Contains functions for registering and analyzing resource information |
| 3 | * |
| 4 | * based on isapnp.c resource management (c) Jaroslav Kysela <perex@suse.cz> |
| 5 | * Copyright 2003 Adam Belay <ambx1@neo.rr.com> |
| 6 | * |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/module.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <asm/io.h> |
| 14 | #include <asm/dma.h> |
| 15 | #include <asm/irq.h> |
| 16 | #include <linux/pci.h> |
| 17 | #include <linux/ioport.h> |
| 18 | #include <linux/init.h> |
| 19 | |
| 20 | #include <linux/pnp.h> |
| 21 | #include "base.h" |
| 22 | |
| 23 | static int pnp_reserve_irq[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some IRQ */ |
| 24 | static int pnp_reserve_dma[8] = { [0 ... 7] = -1 }; /* reserve (don't use) some DMA */ |
| 25 | static int pnp_reserve_io[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some I/O region */ |
| 26 | static int pnp_reserve_mem[16] = { [0 ... 15] = -1 }; /* reserve (don't use) some memory region */ |
| 27 | |
| 28 | |
| 29 | /* |
| 30 | * option registration |
| 31 | */ |
| 32 | |
| 33 | static struct pnp_option * pnp_build_option(int priority) |
| 34 | { |
| 35 | struct pnp_option *option = pnp_alloc(sizeof(struct pnp_option)); |
| 36 | |
| 37 | /* check if pnp_alloc ran out of memory */ |
| 38 | if (!option) |
| 39 | return NULL; |
| 40 | |
| 41 | option->priority = priority & 0xff; |
| 42 | /* make sure the priority is valid */ |
| 43 | if (option->priority > PNP_RES_PRIORITY_FUNCTIONAL) |
| 44 | option->priority = PNP_RES_PRIORITY_INVALID; |
| 45 | |
| 46 | return option; |
| 47 | } |
| 48 | |
| 49 | struct pnp_option * pnp_register_independent_option(struct pnp_dev *dev) |
| 50 | { |
| 51 | struct pnp_option *option; |
| 52 | if (!dev) |
| 53 | return NULL; |
| 54 | |
| 55 | option = pnp_build_option(PNP_RES_PRIORITY_PREFERRED); |
| 56 | |
| 57 | /* this should never happen but if it does we'll try to continue */ |
| 58 | if (dev->independent) |
| 59 | pnp_err("independent resource already registered"); |
| 60 | dev->independent = option; |
| 61 | return option; |
| 62 | } |
| 63 | |
| 64 | struct pnp_option * pnp_register_dependent_option(struct pnp_dev *dev, int priority) |
| 65 | { |
| 66 | struct pnp_option *option; |
| 67 | if (!dev) |
| 68 | return NULL; |
| 69 | |
| 70 | option = pnp_build_option(priority); |
| 71 | |
| 72 | if (dev->dependent) { |
| 73 | struct pnp_option *parent = dev->dependent; |
| 74 | while (parent->next) |
| 75 | parent = parent->next; |
| 76 | parent->next = option; |
| 77 | } else |
| 78 | dev->dependent = option; |
| 79 | return option; |
| 80 | } |
| 81 | |
| 82 | int pnp_register_irq_resource(struct pnp_option *option, struct pnp_irq *data) |
| 83 | { |
| 84 | struct pnp_irq *ptr; |
| 85 | if (!option) |
| 86 | return -EINVAL; |
| 87 | if (!data) |
| 88 | return -EINVAL; |
| 89 | |
| 90 | ptr = option->irq; |
| 91 | while (ptr && ptr->next) |
| 92 | ptr = ptr->next; |
| 93 | if (ptr) |
| 94 | ptr->next = data; |
| 95 | else |
| 96 | option->irq = data; |
| 97 | |
| 98 | #ifdef CONFIG_PCI |
| 99 | { |
| 100 | int i; |
| 101 | |
| 102 | for (i = 0; i < 16; i++) |
| 103 | if (test_bit(i, data->map)) |
David Shaohua Li | c9c3e45 | 2005-04-01 00:07:31 -0500 | [diff] [blame] | 104 | pcibios_penalize_isa_irq(i, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | #endif |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | int pnp_register_dma_resource(struct pnp_option *option, struct pnp_dma *data) |
| 111 | { |
| 112 | struct pnp_dma *ptr; |
| 113 | if (!option) |
| 114 | return -EINVAL; |
| 115 | if (!data) |
| 116 | return -EINVAL; |
| 117 | |
| 118 | ptr = option->dma; |
| 119 | while (ptr && ptr->next) |
| 120 | ptr = ptr->next; |
| 121 | if (ptr) |
| 122 | ptr->next = data; |
| 123 | else |
| 124 | option->dma = data; |
| 125 | |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | int pnp_register_port_resource(struct pnp_option *option, struct pnp_port *data) |
| 130 | { |
| 131 | struct pnp_port *ptr; |
| 132 | if (!option) |
| 133 | return -EINVAL; |
| 134 | if (!data) |
| 135 | return -EINVAL; |
| 136 | |
| 137 | ptr = option->port; |
| 138 | while (ptr && ptr->next) |
| 139 | ptr = ptr->next; |
| 140 | if (ptr) |
| 141 | ptr->next = data; |
| 142 | else |
| 143 | option->port = data; |
| 144 | |
| 145 | return 0; |
| 146 | } |
| 147 | |
| 148 | int pnp_register_mem_resource(struct pnp_option *option, struct pnp_mem *data) |
| 149 | { |
| 150 | struct pnp_mem *ptr; |
| 151 | if (!option) |
| 152 | return -EINVAL; |
| 153 | if (!data) |
| 154 | return -EINVAL; |
| 155 | |
| 156 | ptr = option->mem; |
| 157 | while (ptr && ptr->next) |
| 158 | ptr = ptr->next; |
| 159 | if (ptr) |
| 160 | ptr->next = data; |
| 161 | else |
| 162 | option->mem = data; |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static void pnp_free_port(struct pnp_port *port) |
| 167 | { |
| 168 | struct pnp_port *next; |
| 169 | |
| 170 | while (port) { |
| 171 | next = port->next; |
| 172 | kfree(port); |
| 173 | port = next; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | static void pnp_free_irq(struct pnp_irq *irq) |
| 178 | { |
| 179 | struct pnp_irq *next; |
| 180 | |
| 181 | while (irq) { |
| 182 | next = irq->next; |
| 183 | kfree(irq); |
| 184 | irq = next; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | static void pnp_free_dma(struct pnp_dma *dma) |
| 189 | { |
| 190 | struct pnp_dma *next; |
| 191 | |
| 192 | while (dma) { |
| 193 | next = dma->next; |
| 194 | kfree(dma); |
| 195 | dma = next; |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | static void pnp_free_mem(struct pnp_mem *mem) |
| 200 | { |
| 201 | struct pnp_mem *next; |
| 202 | |
| 203 | while (mem) { |
| 204 | next = mem->next; |
| 205 | kfree(mem); |
| 206 | mem = next; |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | void pnp_free_option(struct pnp_option *option) |
| 211 | { |
| 212 | struct pnp_option *next; |
| 213 | |
| 214 | while (option) { |
| 215 | next = option->next; |
| 216 | pnp_free_port(option->port); |
| 217 | pnp_free_irq(option->irq); |
| 218 | pnp_free_dma(option->dma); |
| 219 | pnp_free_mem(option->mem); |
| 220 | kfree(option); |
| 221 | option = next; |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | |
| 226 | /* |
| 227 | * resource validity checking |
| 228 | */ |
| 229 | |
| 230 | #define length(start, end) (*(end) - *(start) + 1) |
| 231 | |
| 232 | /* Two ranges conflict if one doesn't end before the other starts */ |
| 233 | #define ranged_conflict(starta, enda, startb, endb) \ |
| 234 | !((*(enda) < *(startb)) || (*(endb) < *(starta))) |
| 235 | |
| 236 | #define cannot_compare(flags) \ |
| 237 | ((flags) & (IORESOURCE_UNSET | IORESOURCE_DISABLED)) |
| 238 | |
| 239 | int pnp_check_port(struct pnp_dev * dev, int idx) |
| 240 | { |
| 241 | int tmp; |
| 242 | struct pnp_dev *tdev; |
Greg Kroah-Hartman | b60ba83 | 2006-06-12 17:07:07 -0700 | [diff] [blame] | 243 | resource_size_t *port, *end, *tport, *tend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | port = &dev->res.port_resource[idx].start; |
| 245 | end = &dev->res.port_resource[idx].end; |
| 246 | |
| 247 | /* if the resource doesn't exist, don't complain about it */ |
| 248 | if (cannot_compare(dev->res.port_resource[idx].flags)) |
| 249 | return 1; |
| 250 | |
| 251 | /* check if the resource is already in use, skip if the |
| 252 | * device is active because it itself may be in use */ |
| 253 | if(!dev->active) { |
| 254 | if (__check_region(&ioport_resource, *port, length(port,end))) |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | /* check if the resource is reserved */ |
| 259 | for (tmp = 0; tmp < 8; tmp++) { |
| 260 | int rport = pnp_reserve_io[tmp << 1]; |
| 261 | int rend = pnp_reserve_io[(tmp << 1) + 1] + rport - 1; |
| 262 | if (ranged_conflict(port,end,&rport,&rend)) |
| 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | /* check for internal conflicts */ |
| 267 | for (tmp = 0; tmp < PNP_MAX_PORT && tmp != idx; tmp++) { |
| 268 | if (dev->res.port_resource[tmp].flags & IORESOURCE_IO) { |
| 269 | tport = &dev->res.port_resource[tmp].start; |
| 270 | tend = &dev->res.port_resource[tmp].end; |
| 271 | if (ranged_conflict(port,end,tport,tend)) |
| 272 | return 0; |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | /* check for conflicts with other pnp devices */ |
| 277 | pnp_for_each_dev(tdev) { |
| 278 | if (tdev == dev) |
| 279 | continue; |
| 280 | for (tmp = 0; tmp < PNP_MAX_PORT; tmp++) { |
| 281 | if (tdev->res.port_resource[tmp].flags & IORESOURCE_IO) { |
| 282 | if (cannot_compare(tdev->res.port_resource[tmp].flags)) |
| 283 | continue; |
| 284 | tport = &tdev->res.port_resource[tmp].start; |
| 285 | tend = &tdev->res.port_resource[tmp].end; |
| 286 | if (ranged_conflict(port,end,tport,tend)) |
| 287 | return 0; |
| 288 | } |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | return 1; |
| 293 | } |
| 294 | |
| 295 | int pnp_check_mem(struct pnp_dev * dev, int idx) |
| 296 | { |
| 297 | int tmp; |
| 298 | struct pnp_dev *tdev; |
Greg Kroah-Hartman | b60ba83 | 2006-06-12 17:07:07 -0700 | [diff] [blame] | 299 | resource_size_t *addr, *end, *taddr, *tend; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | addr = &dev->res.mem_resource[idx].start; |
| 301 | end = &dev->res.mem_resource[idx].end; |
| 302 | |
| 303 | /* if the resource doesn't exist, don't complain about it */ |
| 304 | if (cannot_compare(dev->res.mem_resource[idx].flags)) |
| 305 | return 1; |
| 306 | |
| 307 | /* check if the resource is already in use, skip if the |
| 308 | * device is active because it itself may be in use */ |
| 309 | if(!dev->active) { |
| 310 | if (check_mem_region(*addr, length(addr,end))) |
| 311 | return 0; |
| 312 | } |
| 313 | |
| 314 | /* check if the resource is reserved */ |
| 315 | for (tmp = 0; tmp < 8; tmp++) { |
| 316 | int raddr = pnp_reserve_mem[tmp << 1]; |
| 317 | int rend = pnp_reserve_mem[(tmp << 1) + 1] + raddr - 1; |
| 318 | if (ranged_conflict(addr,end,&raddr,&rend)) |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | /* check for internal conflicts */ |
| 323 | for (tmp = 0; tmp < PNP_MAX_MEM && tmp != idx; tmp++) { |
| 324 | if (dev->res.mem_resource[tmp].flags & IORESOURCE_MEM) { |
| 325 | taddr = &dev->res.mem_resource[tmp].start; |
| 326 | tend = &dev->res.mem_resource[tmp].end; |
| 327 | if (ranged_conflict(addr,end,taddr,tend)) |
| 328 | return 0; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | /* check for conflicts with other pnp devices */ |
| 333 | pnp_for_each_dev(tdev) { |
| 334 | if (tdev == dev) |
| 335 | continue; |
| 336 | for (tmp = 0; tmp < PNP_MAX_MEM; tmp++) { |
| 337 | if (tdev->res.mem_resource[tmp].flags & IORESOURCE_MEM) { |
| 338 | if (cannot_compare(tdev->res.mem_resource[tmp].flags)) |
| 339 | continue; |
| 340 | taddr = &tdev->res.mem_resource[tmp].start; |
| 341 | tend = &tdev->res.mem_resource[tmp].end; |
| 342 | if (ranged_conflict(addr,end,taddr,tend)) |
| 343 | return 0; |
| 344 | } |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | return 1; |
| 349 | } |
| 350 | |
| 351 | static irqreturn_t pnp_test_handler(int irq, void *dev_id, struct pt_regs *regs) |
| 352 | { |
| 353 | return IRQ_HANDLED; |
| 354 | } |
| 355 | |
| 356 | int pnp_check_irq(struct pnp_dev * dev, int idx) |
| 357 | { |
| 358 | int tmp; |
| 359 | struct pnp_dev *tdev; |
Greg Kroah-Hartman | b60ba83 | 2006-06-12 17:07:07 -0700 | [diff] [blame] | 360 | resource_size_t * irq = &dev->res.irq_resource[idx].start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | /* if the resource doesn't exist, don't complain about it */ |
| 363 | if (cannot_compare(dev->res.irq_resource[idx].flags)) |
| 364 | return 1; |
| 365 | |
| 366 | /* check if the resource is valid */ |
| 367 | if (*irq < 0 || *irq > 15) |
| 368 | return 0; |
| 369 | |
| 370 | /* check if the resource is reserved */ |
| 371 | for (tmp = 0; tmp < 16; tmp++) { |
| 372 | if (pnp_reserve_irq[tmp] == *irq) |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | /* check for internal conflicts */ |
| 377 | for (tmp = 0; tmp < PNP_MAX_IRQ && tmp != idx; tmp++) { |
| 378 | if (dev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) { |
| 379 | if (dev->res.irq_resource[tmp].start == *irq) |
| 380 | return 0; |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | #ifdef CONFIG_PCI |
| 385 | /* check if the resource is being used by a pci device */ |
| 386 | { |
| 387 | struct pci_dev *pci = NULL; |
| 388 | for_each_pci_dev(pci) { |
| 389 | if (pci->irq == *irq) |
| 390 | return 0; |
| 391 | } |
| 392 | } |
| 393 | #endif |
| 394 | |
| 395 | /* check if the resource is already in use, skip if the |
| 396 | * device is active because it itself may be in use */ |
| 397 | if(!dev->active) { |
Andrew Morton | 0cadaf4 | 2006-07-01 04:36:37 -0700 | [diff] [blame] | 398 | if (request_irq(*irq, pnp_test_handler, |
Thomas Gleixner | dace145 | 2006-07-01 19:29:38 -0700 | [diff] [blame^] | 399 | IRQF_DISABLED|IRQF_PROBE_SHARED, "pnp", NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | return 0; |
| 401 | free_irq(*irq, NULL); |
| 402 | } |
| 403 | |
| 404 | /* check for conflicts with other pnp devices */ |
| 405 | pnp_for_each_dev(tdev) { |
| 406 | if (tdev == dev) |
| 407 | continue; |
| 408 | for (tmp = 0; tmp < PNP_MAX_IRQ; tmp++) { |
| 409 | if (tdev->res.irq_resource[tmp].flags & IORESOURCE_IRQ) { |
| 410 | if (cannot_compare(tdev->res.irq_resource[tmp].flags)) |
| 411 | continue; |
| 412 | if ((tdev->res.irq_resource[tmp].start == *irq)) |
| 413 | return 0; |
| 414 | } |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | return 1; |
| 419 | } |
| 420 | |
| 421 | int pnp_check_dma(struct pnp_dev * dev, int idx) |
| 422 | { |
| 423 | #ifndef CONFIG_IA64 |
| 424 | int tmp; |
| 425 | struct pnp_dev *tdev; |
Greg Kroah-Hartman | b60ba83 | 2006-06-12 17:07:07 -0700 | [diff] [blame] | 426 | resource_size_t * dma = &dev->res.dma_resource[idx].start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | /* if the resource doesn't exist, don't complain about it */ |
| 429 | if (cannot_compare(dev->res.dma_resource[idx].flags)) |
| 430 | return 1; |
| 431 | |
| 432 | /* check if the resource is valid */ |
| 433 | if (*dma < 0 || *dma == 4 || *dma > 7) |
| 434 | return 0; |
| 435 | |
| 436 | /* check if the resource is reserved */ |
| 437 | for (tmp = 0; tmp < 8; tmp++) { |
| 438 | if (pnp_reserve_dma[tmp] == *dma) |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | /* check for internal conflicts */ |
| 443 | for (tmp = 0; tmp < PNP_MAX_DMA && tmp != idx; tmp++) { |
| 444 | if (dev->res.dma_resource[tmp].flags & IORESOURCE_DMA) { |
| 445 | if (dev->res.dma_resource[tmp].start == *dma) |
| 446 | return 0; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | /* check if the resource is already in use, skip if the |
| 451 | * device is active because it itself may be in use */ |
| 452 | if(!dev->active) { |
| 453 | if (request_dma(*dma, "pnp")) |
| 454 | return 0; |
| 455 | free_dma(*dma); |
| 456 | } |
| 457 | |
| 458 | /* check for conflicts with other pnp devices */ |
| 459 | pnp_for_each_dev(tdev) { |
| 460 | if (tdev == dev) |
| 461 | continue; |
| 462 | for (tmp = 0; tmp < PNP_MAX_DMA; tmp++) { |
| 463 | if (tdev->res.dma_resource[tmp].flags & IORESOURCE_DMA) { |
| 464 | if (cannot_compare(tdev->res.dma_resource[tmp].flags)) |
| 465 | continue; |
| 466 | if ((tdev->res.dma_resource[tmp].start == *dma)) |
| 467 | return 0; |
| 468 | } |
| 469 | } |
| 470 | } |
| 471 | |
| 472 | return 1; |
| 473 | #else |
| 474 | /* IA64 hasn't legacy DMA */ |
| 475 | return 0; |
| 476 | #endif |
| 477 | } |
| 478 | |
| 479 | |
Adrian Bunk | b449f63 | 2005-11-07 01:01:48 -0800 | [diff] [blame] | 480 | #if 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | EXPORT_SYMBOL(pnp_register_dependent_option); |
| 482 | EXPORT_SYMBOL(pnp_register_independent_option); |
| 483 | EXPORT_SYMBOL(pnp_register_irq_resource); |
| 484 | EXPORT_SYMBOL(pnp_register_dma_resource); |
| 485 | EXPORT_SYMBOL(pnp_register_port_resource); |
| 486 | EXPORT_SYMBOL(pnp_register_mem_resource); |
Adrian Bunk | b449f63 | 2005-11-07 01:01:48 -0800 | [diff] [blame] | 487 | #endif /* 0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
| 489 | |
| 490 | /* format is: pnp_reserve_irq=irq1[,irq2] .... */ |
| 491 | |
| 492 | static int __init pnp_setup_reserve_irq(char *str) |
| 493 | { |
| 494 | int i; |
| 495 | |
| 496 | for (i = 0; i < 16; i++) |
| 497 | if (get_option(&str,&pnp_reserve_irq[i]) != 2) |
| 498 | break; |
| 499 | return 1; |
| 500 | } |
| 501 | |
| 502 | __setup("pnp_reserve_irq=", pnp_setup_reserve_irq); |
| 503 | |
| 504 | /* format is: pnp_reserve_dma=dma1[,dma2] .... */ |
| 505 | |
| 506 | static int __init pnp_setup_reserve_dma(char *str) |
| 507 | { |
| 508 | int i; |
| 509 | |
| 510 | for (i = 0; i < 8; i++) |
| 511 | if (get_option(&str,&pnp_reserve_dma[i]) != 2) |
| 512 | break; |
| 513 | return 1; |
| 514 | } |
| 515 | |
| 516 | __setup("pnp_reserve_dma=", pnp_setup_reserve_dma); |
| 517 | |
| 518 | /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */ |
| 519 | |
| 520 | static int __init pnp_setup_reserve_io(char *str) |
| 521 | { |
| 522 | int i; |
| 523 | |
| 524 | for (i = 0; i < 16; i++) |
| 525 | if (get_option(&str,&pnp_reserve_io[i]) != 2) |
| 526 | break; |
| 527 | return 1; |
| 528 | } |
| 529 | |
| 530 | __setup("pnp_reserve_io=", pnp_setup_reserve_io); |
| 531 | |
| 532 | /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */ |
| 533 | |
| 534 | static int __init pnp_setup_reserve_mem(char *str) |
| 535 | { |
| 536 | int i; |
| 537 | |
| 538 | for (i = 0; i < 16; i++) |
| 539 | if (get_option(&str,&pnp_reserve_mem[i]) != 2) |
| 540 | break; |
| 541 | return 1; |
| 542 | } |
| 543 | |
| 544 | __setup("pnp_reserve_mem=", pnp_setup_reserve_mem); |