Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) |
| 3 | * |
| 4 | * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> |
| 5 | * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> |
| 6 | * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de> |
| 7 | * |
| 8 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or (at |
| 13 | * your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, but |
| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License along |
| 21 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 22 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 23 | * |
| 24 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 25 | */ |
| 26 | |
| 27 | #include <linux/config.h> |
| 28 | |
| 29 | #include <linux/kernel.h> |
| 30 | #include <linux/module.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/types.h> |
| 33 | #include <linux/proc_fs.h> |
| 34 | #include <linux/spinlock.h> |
| 35 | #include <linux/pm.h> |
| 36 | #include <linux/pci.h> |
| 37 | #include <linux/acpi.h> |
| 38 | #include <acpi/acpi_bus.h> |
| 39 | #include <acpi/acpi_drivers.h> |
| 40 | |
| 41 | |
| 42 | #define _COMPONENT ACPI_PCI_COMPONENT |
| 43 | ACPI_MODULE_NAME ("pci_irq") |
| 44 | |
| 45 | static struct acpi_prt_list acpi_prt; |
| 46 | static DEFINE_SPINLOCK(acpi_prt_lock); |
| 47 | |
| 48 | /* -------------------------------------------------------------------------- |
| 49 | PCI IRQ Routing Table (PRT) Support |
| 50 | -------------------------------------------------------------------------- */ |
| 51 | |
| 52 | static struct acpi_prt_entry * |
| 53 | acpi_pci_irq_find_prt_entry ( |
| 54 | int segment, |
| 55 | int bus, |
| 56 | int device, |
| 57 | int pin) |
| 58 | { |
| 59 | struct list_head *node = NULL; |
| 60 | struct acpi_prt_entry *entry = NULL; |
| 61 | |
| 62 | ACPI_FUNCTION_TRACE("acpi_pci_irq_find_prt_entry"); |
| 63 | |
| 64 | if (!acpi_prt.count) |
| 65 | return_PTR(NULL); |
| 66 | |
| 67 | /* |
| 68 | * Parse through all PRT entries looking for a match on the specified |
| 69 | * PCI device's segment, bus, device, and pin (don't care about func). |
| 70 | * |
| 71 | */ |
| 72 | spin_lock(&acpi_prt_lock); |
| 73 | list_for_each(node, &acpi_prt.entries) { |
| 74 | entry = list_entry(node, struct acpi_prt_entry, node); |
| 75 | if ((segment == entry->id.segment) |
| 76 | && (bus == entry->id.bus) |
| 77 | && (device == entry->id.device) |
| 78 | && (pin == entry->pin)) { |
| 79 | spin_unlock(&acpi_prt_lock); |
| 80 | return_PTR(entry); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | spin_unlock(&acpi_prt_lock); |
| 85 | return_PTR(NULL); |
| 86 | } |
| 87 | |
| 88 | |
| 89 | static int |
| 90 | acpi_pci_irq_add_entry ( |
| 91 | acpi_handle handle, |
| 92 | int segment, |
| 93 | int bus, |
| 94 | struct acpi_pci_routing_table *prt) |
| 95 | { |
| 96 | struct acpi_prt_entry *entry = NULL; |
| 97 | |
| 98 | ACPI_FUNCTION_TRACE("acpi_pci_irq_add_entry"); |
| 99 | |
| 100 | if (!prt) |
| 101 | return_VALUE(-EINVAL); |
| 102 | |
| 103 | entry = kmalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL); |
| 104 | if (!entry) |
| 105 | return_VALUE(-ENOMEM); |
| 106 | memset(entry, 0, sizeof(struct acpi_prt_entry)); |
| 107 | |
| 108 | entry->id.segment = segment; |
| 109 | entry->id.bus = bus; |
| 110 | entry->id.device = (prt->address >> 16) & 0xFFFF; |
| 111 | entry->id.function = prt->address & 0xFFFF; |
| 112 | entry->pin = prt->pin; |
| 113 | |
| 114 | /* |
| 115 | * Type 1: Dynamic |
| 116 | * --------------- |
| 117 | * The 'source' field specifies the PCI interrupt link device used to |
| 118 | * configure the IRQ assigned to this slot|dev|pin. The 'source_index' |
| 119 | * indicates which resource descriptor in the resource template (of |
| 120 | * the link device) this interrupt is allocated from. |
| 121 | * |
| 122 | * NOTE: Don't query the Link Device for IRQ information at this time |
| 123 | * because Link Device enumeration may not have occurred yet |
| 124 | * (e.g. exists somewhere 'below' this _PRT entry in the ACPI |
| 125 | * namespace). |
| 126 | */ |
| 127 | if (prt->source[0]) { |
| 128 | acpi_get_handle(handle, prt->source, &entry->link.handle); |
| 129 | entry->link.index = prt->source_index; |
| 130 | } |
| 131 | /* |
| 132 | * Type 2: Static |
| 133 | * -------------- |
| 134 | * The 'source' field is NULL, and the 'source_index' field specifies |
| 135 | * the IRQ value, which is hardwired to specific interrupt inputs on |
| 136 | * the interrupt controller. |
| 137 | */ |
| 138 | else |
| 139 | entry->link.index = prt->source_index; |
| 140 | |
| 141 | ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO, |
| 142 | " %02X:%02X:%02X[%c] -> %s[%d]\n", |
| 143 | entry->id.segment, entry->id.bus, entry->id.device, |
| 144 | ('A' + entry->pin), prt->source, entry->link.index)); |
| 145 | |
| 146 | spin_lock(&acpi_prt_lock); |
| 147 | list_add_tail(&entry->node, &acpi_prt.entries); |
| 148 | acpi_prt.count++; |
| 149 | spin_unlock(&acpi_prt_lock); |
| 150 | |
| 151 | return_VALUE(0); |
| 152 | } |
| 153 | |
| 154 | |
| 155 | static void |
| 156 | acpi_pci_irq_del_entry ( |
| 157 | int segment, |
| 158 | int bus, |
| 159 | struct acpi_prt_entry *entry) |
| 160 | { |
| 161 | if (segment == entry->id.segment && bus == entry->id.bus){ |
| 162 | acpi_prt.count--; |
| 163 | list_del(&entry->node); |
| 164 | kfree(entry); |
| 165 | } |
| 166 | } |
| 167 | |
| 168 | |
| 169 | int |
| 170 | acpi_pci_irq_add_prt ( |
| 171 | acpi_handle handle, |
| 172 | int segment, |
| 173 | int bus) |
| 174 | { |
| 175 | acpi_status status = AE_OK; |
| 176 | char *pathname = NULL; |
| 177 | struct acpi_buffer buffer = {0, NULL}; |
| 178 | struct acpi_pci_routing_table *prt = NULL; |
| 179 | struct acpi_pci_routing_table *entry = NULL; |
| 180 | static int first_time = 1; |
| 181 | |
| 182 | ACPI_FUNCTION_TRACE("acpi_pci_irq_add_prt"); |
| 183 | |
| 184 | pathname = (char *) kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL); |
| 185 | if(!pathname) |
| 186 | return_VALUE(-ENOMEM); |
| 187 | memset(pathname, 0, ACPI_PATHNAME_MAX); |
| 188 | |
| 189 | if (first_time) { |
| 190 | acpi_prt.count = 0; |
| 191 | INIT_LIST_HEAD(&acpi_prt.entries); |
| 192 | first_time = 0; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * NOTE: We're given a 'handle' to the _PRT object's parent device |
| 197 | * (either a PCI root bridge or PCI-PCI bridge). |
| 198 | */ |
| 199 | |
| 200 | buffer.length = ACPI_PATHNAME_MAX; |
| 201 | buffer.pointer = pathname; |
| 202 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
| 203 | |
| 204 | printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n", |
| 205 | pathname); |
| 206 | |
| 207 | /* |
| 208 | * Evaluate this _PRT and add its entries to our global list (acpi_prt). |
| 209 | */ |
| 210 | |
| 211 | buffer.length = 0; |
| 212 | buffer.pointer = NULL; |
| 213 | kfree(pathname); |
| 214 | status = acpi_get_irq_routing_table(handle, &buffer); |
| 215 | if (status != AE_BUFFER_OVERFLOW) { |
| 216 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n", |
| 217 | acpi_format_exception(status))); |
| 218 | return_VALUE(-ENODEV); |
| 219 | } |
| 220 | |
| 221 | prt = kmalloc(buffer.length, GFP_KERNEL); |
| 222 | if (!prt){ |
| 223 | return_VALUE(-ENOMEM); |
| 224 | } |
| 225 | memset(prt, 0, buffer.length); |
| 226 | buffer.pointer = prt; |
| 227 | |
| 228 | status = acpi_get_irq_routing_table(handle, &buffer); |
| 229 | if (ACPI_FAILURE(status)) { |
| 230 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n", |
| 231 | acpi_format_exception(status))); |
| 232 | kfree(buffer.pointer); |
| 233 | return_VALUE(-ENODEV); |
| 234 | } |
| 235 | |
| 236 | entry = prt; |
| 237 | |
| 238 | while (entry && (entry->length > 0)) { |
| 239 | acpi_pci_irq_add_entry(handle, segment, bus, entry); |
| 240 | entry = (struct acpi_pci_routing_table *) |
| 241 | ((unsigned long) entry + entry->length); |
| 242 | } |
| 243 | |
| 244 | kfree(prt); |
| 245 | |
| 246 | return_VALUE(0); |
| 247 | } |
| 248 | |
| 249 | void |
| 250 | acpi_pci_irq_del_prt (int segment, int bus) |
| 251 | { |
| 252 | struct list_head *node = NULL, *n = NULL; |
| 253 | struct acpi_prt_entry *entry = NULL; |
| 254 | |
| 255 | if (!acpi_prt.count) { |
| 256 | return; |
| 257 | } |
| 258 | |
| 259 | printk(KERN_DEBUG "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", |
| 260 | segment, bus); |
| 261 | spin_lock(&acpi_prt_lock); |
| 262 | list_for_each_safe(node, n, &acpi_prt.entries) { |
| 263 | entry = list_entry(node, struct acpi_prt_entry, node); |
| 264 | |
| 265 | acpi_pci_irq_del_entry(segment, bus, entry); |
| 266 | } |
| 267 | spin_unlock(&acpi_prt_lock); |
| 268 | } |
| 269 | /* -------------------------------------------------------------------------- |
| 270 | PCI Interrupt Routing Support |
| 271 | -------------------------------------------------------------------------- */ |
| 272 | |
| 273 | /* |
| 274 | * acpi_pci_irq_lookup |
| 275 | * success: return IRQ >= 0 |
| 276 | * failure: return -1 |
| 277 | */ |
| 278 | static int |
| 279 | acpi_pci_irq_lookup ( |
| 280 | struct pci_bus *bus, |
| 281 | int device, |
| 282 | int pin, |
| 283 | int *edge_level, |
| 284 | int *active_high_low, |
| 285 | char **link) |
| 286 | { |
| 287 | struct acpi_prt_entry *entry = NULL; |
| 288 | int segment = pci_domain_nr(bus); |
| 289 | int bus_nr = bus->number; |
| 290 | int irq; |
| 291 | |
| 292 | ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup"); |
| 293 | |
| 294 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 295 | "Searching for PRT entry for %02x:%02x:%02x[%c]\n", |
| 296 | segment, bus_nr, device, ('A' + pin))); |
| 297 | |
| 298 | entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); |
| 299 | if (!entry) { |
| 300 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n")); |
| 301 | return_VALUE(-1); |
| 302 | } |
| 303 | |
| 304 | if (entry->link.handle) { |
| 305 | irq = acpi_pci_link_get_irq(entry->link.handle, |
| 306 | entry->link.index, edge_level, active_high_low, link); |
| 307 | if (irq < 0) { |
| 308 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n")); |
| 309 | return_VALUE(-1); |
| 310 | } |
| 311 | } else { |
| 312 | irq = entry->link.index; |
| 313 | *edge_level = ACPI_LEVEL_SENSITIVE; |
| 314 | *active_high_low = ACPI_ACTIVE_LOW; |
| 315 | } |
| 316 | |
| 317 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq)); |
| 318 | |
| 319 | return_VALUE(irq); |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * acpi_pci_irq_derive |
| 324 | * success: return IRQ >= 0 |
| 325 | * failure: return < 0 |
| 326 | */ |
| 327 | static int |
| 328 | acpi_pci_irq_derive ( |
| 329 | struct pci_dev *dev, |
| 330 | int pin, |
| 331 | int *edge_level, |
| 332 | int *active_high_low, |
| 333 | char **link) |
| 334 | { |
| 335 | struct pci_dev *bridge = dev; |
| 336 | int irq = -1; |
| 337 | u8 bridge_pin = 0; |
| 338 | |
| 339 | ACPI_FUNCTION_TRACE("acpi_pci_irq_derive"); |
| 340 | |
| 341 | if (!dev) |
| 342 | return_VALUE(-EINVAL); |
| 343 | |
| 344 | /* |
| 345 | * Attempt to derive an IRQ for this device from a parent bridge's |
| 346 | * PCI interrupt routing entry (eg. yenta bridge and add-in card bridge). |
| 347 | */ |
| 348 | while (irq < 0 && bridge->bus->self) { |
| 349 | pin = (pin + PCI_SLOT(bridge->devfn)) % 4; |
| 350 | bridge = bridge->bus->self; |
| 351 | |
| 352 | if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) { |
| 353 | /* PC card has the same IRQ as its cardbridge */ |
| 354 | pci_read_config_byte(bridge, PCI_INTERRUPT_PIN, &bridge_pin); |
| 355 | if (!bridge_pin) { |
| 356 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
| 357 | "No interrupt pin configured for device %s\n", pci_name(bridge))); |
| 358 | return_VALUE(-1); |
| 359 | } |
| 360 | /* Pin is from 0 to 3 */ |
| 361 | bridge_pin --; |
| 362 | pin = bridge_pin; |
| 363 | } |
| 364 | |
| 365 | irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn), |
| 366 | pin, edge_level, active_high_low, link); |
| 367 | } |
| 368 | |
| 369 | if (irq < 0) { |
| 370 | ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to derive IRQ for device %s\n", pci_name(dev))); |
| 371 | return_VALUE(-1); |
| 372 | } |
| 373 | |
| 374 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n", |
| 375 | irq, pci_name(dev), pci_name(bridge))); |
| 376 | |
| 377 | return_VALUE(irq); |
| 378 | } |
| 379 | |
| 380 | /* |
| 381 | * acpi_pci_irq_enable |
| 382 | * success: return 0 |
| 383 | * failure: return < 0 |
| 384 | */ |
| 385 | |
| 386 | int |
| 387 | acpi_pci_irq_enable ( |
| 388 | struct pci_dev *dev) |
| 389 | { |
| 390 | int irq = 0; |
| 391 | u8 pin = 0; |
| 392 | int edge_level = ACPI_LEVEL_SENSITIVE; |
| 393 | int active_high_low = ACPI_ACTIVE_LOW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | char *link = NULL; |
| 395 | |
| 396 | ACPI_FUNCTION_TRACE("acpi_pci_irq_enable"); |
| 397 | |
| 398 | if (!dev) |
| 399 | return_VALUE(-EINVAL); |
| 400 | |
| 401 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); |
| 402 | if (!pin) { |
| 403 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No interrupt pin configured for device %s\n", pci_name(dev))); |
| 404 | return_VALUE(0); |
| 405 | } |
| 406 | pin--; |
| 407 | |
| 408 | if (!dev->bus) { |
| 409 | ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) 'bus' field\n")); |
| 410 | return_VALUE(-ENODEV); |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * First we check the PCI IRQ routing table (PRT) for an IRQ. PRT |
| 415 | * values override any BIOS-assigned IRQs set during boot. |
| 416 | */ |
| 417 | irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
| 418 | &edge_level, &active_high_low, &link); |
| 419 | |
| 420 | /* |
| 421 | * If no PRT entry was found, we'll try to derive an IRQ from the |
| 422 | * device's parent bridge. |
| 423 | */ |
| 424 | if (irq < 0) |
| 425 | irq = acpi_pci_irq_derive(dev, pin, &edge_level, |
| 426 | &active_high_low, &link); |
| 427 | |
| 428 | /* |
| 429 | * No IRQ known to the ACPI subsystem - maybe the BIOS / |
| 430 | * driver reported one, then use it. Exit in any case. |
| 431 | */ |
| 432 | if (irq < 0) { |
| 433 | printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI", |
| 434 | pci_name(dev), ('A' + pin)); |
| 435 | /* Interrupt Line values above 0xF are forbidden */ |
Linus Torvalds | 44f8e1a | 2005-07-02 10:35:33 -0700 | [diff] [blame] | 436 | if (dev->irq > 0 && (dev->irq <= 0xF)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | printk(" - using IRQ %d\n", dev->irq); |
Linus Torvalds | 7be426c | 2005-06-25 10:01:36 -0700 | [diff] [blame] | 438 | acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | return_VALUE(0); |
| 440 | } |
| 441 | else { |
| 442 | printk("\n"); |
| 443 | return_VALUE(0); |
| 444 | } |
| 445 | } |
| 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | dev->irq = acpi_register_gsi(irq, edge_level, active_high_low); |
| 448 | |
| 449 | printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ", |
| 450 | pci_name(dev), 'A' + pin); |
| 451 | |
| 452 | if (link) |
| 453 | printk("Link [%s] -> ", link); |
| 454 | |
| 455 | printk("GSI %u (%s, %s) -> IRQ %d\n", irq, |
| 456 | (edge_level == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", |
| 457 | (active_high_low == ACPI_ACTIVE_LOW) ? "low" : "high", |
| 458 | dev->irq); |
| 459 | |
| 460 | return_VALUE(0); |
| 461 | } |
| 462 | EXPORT_SYMBOL(acpi_pci_irq_enable); |
| 463 | |
| 464 | |
| 465 | #ifdef CONFIG_ACPI_DEALLOCATE_IRQ |
| 466 | void |
| 467 | acpi_pci_irq_disable ( |
| 468 | struct pci_dev *dev) |
| 469 | { |
| 470 | int gsi = 0; |
| 471 | u8 pin = 0; |
| 472 | int edge_level = ACPI_LEVEL_SENSITIVE; |
| 473 | int active_high_low = ACPI_ACTIVE_LOW; |
| 474 | |
| 475 | ACPI_FUNCTION_TRACE("acpi_pci_irq_disable"); |
| 476 | |
| 477 | if (!dev) |
| 478 | return_VOID; |
| 479 | |
| 480 | pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); |
| 481 | if (!pin) |
| 482 | return_VOID; |
| 483 | pin--; |
| 484 | |
| 485 | if (!dev->bus) |
| 486 | return_VOID; |
| 487 | |
| 488 | /* |
| 489 | * First we check the PCI IRQ routing table (PRT) for an IRQ. |
| 490 | */ |
| 491 | gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin, |
| 492 | &edge_level, &active_high_low, NULL); |
| 493 | /* |
| 494 | * If no PRT entry was found, we'll try to derive an IRQ from the |
| 495 | * device's parent bridge. |
| 496 | */ |
| 497 | if (gsi < 0) |
| 498 | gsi = acpi_pci_irq_derive(dev, pin, |
| 499 | &edge_level, &active_high_low, NULL); |
| 500 | if (gsi < 0) |
| 501 | return_VOID; |
| 502 | |
| 503 | /* |
| 504 | * TBD: It might be worth clearing dev->irq by magic constant |
| 505 | * (e.g. PCI_UNDEFINED_IRQ). |
| 506 | */ |
| 507 | |
| 508 | printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n", |
| 509 | pci_name(dev)); |
| 510 | |
| 511 | acpi_unregister_gsi(gsi); |
| 512 | |
| 513 | return_VOID; |
| 514 | } |
| 515 | #endif /* CONFIG_ACPI_DEALLOCATE_IRQ */ |