1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Low-Level PCI Support for PC -- Routing of Interrupts 4 * 5 * (c) 1999--2000 Martin Mares <mj@ucw.cz> 6 */ 7 8 #include <linux/types.h> 9 #include <linux/kernel.h> 10 #include <linux/pci.h> 11 #include <linux/init.h> 12 #include <linux/interrupt.h> 13 #include <linux/dmi.h> 14 #include <linux/io.h> 15 #include <linux/smp.h> 16 #include <linux/spinlock.h> 17 #include <asm/io_apic.h> 18 #include <linux/irq.h> 19 #include <linux/acpi.h> 20 21 #include <asm/i8259.h> 22 #include <asm/pc-conf-reg.h> 23 #include <asm/pci_x86.h> 24 25 #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24)) 26 #define PIRQ_VERSION 0x0100 27 28 #define IRT_SIGNATURE (('$' << 0) + ('I' << 8) + ('R' << 16) + ('T' << 24)) 29 30 static int broken_hp_bios_irq9; 31 static int acer_tm360_irqrouting; 32 33 static struct irq_routing_table *pirq_table; 34 35 static int pirq_enable_irq(struct pci_dev *dev); 36 static void pirq_disable_irq(struct pci_dev *dev); 37 38 /* 39 * Never use: 0, 1, 2 (timer, keyboard, and cascade) 40 * Avoid using: 13, 14 and 15 (FP error and IDE). 41 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse) 42 */ 43 unsigned int pcibios_irq_mask = 0xfff8; 44 45 static int pirq_penalty[16] = { 46 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000, 47 0, 0, 0, 0, 1000, 100000, 100000, 100000 48 }; 49 50 struct irq_router { 51 char *name; 52 u16 vendor, device; 53 int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq); 54 int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, 55 int new); 56 int (*lvl)(struct pci_dev *router, struct pci_dev *dev, int pirq, 57 int irq); 58 }; 59 60 struct irq_router_handler { 61 u16 vendor; 62 int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device); 63 }; 64 65 int (*pcibios_enable_irq)(struct pci_dev *dev) = pirq_enable_irq; 66 void (*pcibios_disable_irq)(struct pci_dev *dev) = pirq_disable_irq; 67 68 /* 69 * Check passed address for the PCI IRQ Routing Table signature 70 * and perform checksum verification. 71 */ 72 73 static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr, 74 u8 *limit) 75 { 76 struct irq_routing_table *rt; 77 int i; 78 u8 sum; 79 80 rt = (struct irq_routing_table *)addr; 81 if (rt->signature != PIRQ_SIGNATURE || 82 rt->version != PIRQ_VERSION || 83 rt->size % 16 || 84 rt->size < sizeof(struct irq_routing_table) || 85 (limit && rt->size > limit - addr)) 86 return NULL; 87 sum = 0; 88 for (i = 0; i < rt->size; i++) 89 sum += addr[i]; 90 if (!sum) { 91 DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%lx\n", 92 __pa(rt)); 93 return rt; 94 } 95 return NULL; 96 } 97 98 /* 99 * Handle the $IRT PCI IRQ Routing Table format used by AMI for its BCP 100 * (BIOS Configuration Program) external tool meant for tweaking BIOS 101 * structures without the need to rebuild it from sources. The $IRT 102 * format has been invented by AMI before Microsoft has come up with its 103 * $PIR format and a $IRT table is therefore there in some systems that 104 * lack a $PIR table. 105 * 106 * It uses the same PCI BIOS 2.1 format for interrupt routing entries 107 * themselves but has a different simpler header prepended instead, 108 * occupying 8 bytes, where a `$IRT' signature is followed by one byte 109 * specifying the total number of interrupt routing entries allocated in 110 * the table, then one byte specifying the actual number of entries used 111 * (which the BCP tool can take advantage of when modifying the table), 112 * and finally a 16-bit word giving the IRQs devoted exclusively to PCI. 113 * Unlike with the $PIR table there is no alignment guarantee. 114 * 115 * Given the similarity of the two formats the $IRT one is trivial to 116 * convert to the $PIR one, which we do here, except that obviously we 117 * have no information as to the router device to use, but we can handle 118 * it by matching PCI device IDs actually seen on the bus against ones 119 * that our individual routers recognise. 120 * 121 * Reportedly there is another $IRT table format where a 16-bit word 122 * follows the header instead that points to interrupt routing entries 123 * in a $PIR table provided elsewhere. In that case this code will not 124 * be reached though as the $PIR table will have been chosen instead. 125 */ 126 static inline struct irq_routing_table *pirq_convert_irt_table(u8 *addr, 127 u8 *limit) 128 { 129 struct irt_routing_table *ir; 130 struct irq_routing_table *rt; 131 u16 size; 132 u8 sum; 133 int i; 134 135 ir = (struct irt_routing_table *)addr; 136 if (ir->signature != IRT_SIGNATURE || !ir->used || ir->size < ir->used) 137 return NULL; 138 139 size = sizeof(*ir) + ir->used * sizeof(ir->slots[0]); 140 if (size > limit - addr) 141 return NULL; 142 143 DBG(KERN_DEBUG "PCI: $IRT Interrupt Routing Table found at 0x%lx\n", 144 __pa(ir)); 145 146 size = sizeof(*rt) + ir->used * sizeof(rt->slots[0]); 147 rt = kzalloc(size, GFP_KERNEL); 148 if (!rt) 149 return NULL; 150 151 rt->signature = PIRQ_SIGNATURE; 152 rt->version = PIRQ_VERSION; 153 rt->size = size; 154 rt->exclusive_irqs = ir->exclusive_irqs; 155 for (i = 0; i < ir->used; i++) 156 rt->slots[i] = ir->slots[i]; 157 158 addr = (u8 *)rt; 159 sum = 0; 160 for (i = 0; i < size; i++) 161 sum += addr[i]; 162 rt->checksum = -sum; 163 164 return rt; 165 } 166 167 /* 168 * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table. 169 */ 170 171 static struct irq_routing_table * __init pirq_find_routing_table(void) 172 { 173 u8 * const bios_start = (u8 *)__va(0xf0000); 174 u8 * const bios_end = (u8 *)__va(0x100000); 175 u8 *addr; 176 struct irq_routing_table *rt; 177 178 if (pirq_table_addr) { 179 rt = pirq_check_routing_table((u8 *)__va(pirq_table_addr), 180 NULL); 181 if (rt) 182 return rt; 183 printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n"); 184 } 185 for (addr = bios_start; 186 addr < bios_end - sizeof(struct irq_routing_table); 187 addr += 16) { 188 rt = pirq_check_routing_table(addr, bios_end); 189 if (rt) 190 return rt; 191 } 192 for (addr = bios_start; 193 addr < bios_end - sizeof(struct irt_routing_table); 194 addr++) { 195 rt = pirq_convert_irt_table(addr, bios_end); 196 if (rt) 197 return rt; 198 } 199 return NULL; 200 } 201 202 /* 203 * If we have a IRQ routing table, use it to search for peer host 204 * bridges. It's a gross hack, but since there are no other known 205 * ways how to get a list of buses, we have to go this way. 206 */ 207 208 static void __init pirq_peer_trick(void) 209 { 210 struct irq_routing_table *rt = pirq_table; 211 u8 busmap[256]; 212 int i; 213 struct irq_info *e; 214 215 memset(busmap, 0, sizeof(busmap)); 216 for (i = 0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) { 217 e = &rt->slots[i]; 218 #ifdef DEBUG 219 { 220 int j; 221 DBG(KERN_DEBUG "%02x:%02x.%x slot=%02x", 222 e->bus, e->devfn / 8, e->devfn % 8, e->slot); 223 for (j = 0; j < 4; j++) 224 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap); 225 DBG("\n"); 226 } 227 #endif 228 busmap[e->bus] = 1; 229 } 230 for (i = 1; i < 256; i++) { 231 if (!busmap[i] || pci_find_bus(0, i)) 232 continue; 233 pcibios_scan_root(i); 234 } 235 pcibios_last_bus = -1; 236 } 237 238 /* 239 * Code for querying and setting of IRQ routes on various interrupt routers. 240 * PIC Edge/Level Control Registers (ELCR) 0x4d0 & 0x4d1. 241 */ 242 243 void elcr_set_level_irq(unsigned int irq) 244 { 245 unsigned char mask = 1 << (irq & 7); 246 unsigned int port = PIC_ELCR1 + (irq >> 3); 247 unsigned char val; 248 static u16 elcr_irq_mask; 249 250 if (irq >= 16 || (1 << irq) & elcr_irq_mask) 251 return; 252 253 elcr_irq_mask |= (1 << irq); 254 printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq); 255 val = inb(port); 256 if (!(val & mask)) { 257 DBG(KERN_DEBUG " -> edge"); 258 outb(val | mask, port); 259 } 260 } 261 262 /* 263 * PIRQ routing for the M1487 ISA Bus Controller (IBC) ASIC used 264 * with the ALi FinALi 486 chipset. The IBC is not decoded in the 265 * PCI configuration space, so we identify it by the accompanying 266 * M1489 Cache-Memory PCI Controller (CMP) ASIC. 267 * 268 * There are four 4-bit mappings provided, spread across two PCI 269 * INTx Routing Table Mapping Registers, available in the port I/O 270 * space accessible indirectly via the index/data register pair at 271 * 0x22/0x23, located at indices 0x42 and 0x43 for the INT1/INT2 272 * and INT3/INT4 lines respectively. The INT1/INT3 and INT2/INT4 273 * lines are mapped in the low and the high 4-bit nibble of the 274 * corresponding register as follows: 275 * 276 * 0000 : Disabled 277 * 0001 : IRQ9 278 * 0010 : IRQ3 279 * 0011 : IRQ10 280 * 0100 : IRQ4 281 * 0101 : IRQ5 282 * 0110 : IRQ7 283 * 0111 : IRQ6 284 * 1000 : Reserved 285 * 1001 : IRQ11 286 * 1010 : Reserved 287 * 1011 : IRQ12 288 * 1100 : Reserved 289 * 1101 : IRQ14 290 * 1110 : Reserved 291 * 1111 : IRQ15 292 * 293 * In addition to the usual ELCR register pair there is a separate 294 * PCI INTx Sensitivity Register at index 0x44 in the same port I/O 295 * space, whose bits 3:0 select the trigger mode for INT[4:1] lines 296 * respectively. Any bit set to 1 causes interrupts coming on the 297 * corresponding line to be passed to ISA as edge-triggered and 298 * otherwise they are passed as level-triggered. Manufacturer's 299 * documentation says this register has to be set consistently with 300 * the relevant ELCR register. 301 * 302 * Accesses to the port I/O space concerned here need to be unlocked 303 * by writing the value of 0xc5 to the Lock Register at index 0x03 304 * beforehand. Any other value written to said register prevents 305 * further accesses from reaching the register file, except for the 306 * Lock Register being written with 0xc5 again. 307 * 308 * References: 309 * 310 * "M1489/M1487: 486 PCI Chip Set", Version 1.2, Acer Laboratories 311 * Inc., July 1997 312 */ 313 314 #define PC_CONF_FINALI_LOCK 0x03u 315 #define PC_CONF_FINALI_PCI_INTX_RT1 0x42u 316 #define PC_CONF_FINALI_PCI_INTX_RT2 0x43u 317 #define PC_CONF_FINALI_PCI_INTX_SENS 0x44u 318 319 #define PC_CONF_FINALI_LOCK_KEY 0xc5u 320 321 static u8 read_pc_conf_nybble(u8 base, u8 index) 322 { 323 u8 reg = base + (index >> 1); 324 u8 x; 325 326 x = pc_conf_get(reg); 327 return index & 1 ? x >> 4 : x & 0xf; 328 } 329 330 static void write_pc_conf_nybble(u8 base, u8 index, u8 val) 331 { 332 u8 reg = base + (index >> 1); 333 u8 x; 334 335 x = pc_conf_get(reg); 336 x = index & 1 ? (x & 0x0f) | (val << 4) : (x & 0xf0) | val; 337 pc_conf_set(reg, x); 338 } 339 340 /* 341 * FinALi pirq rules are as follows: 342 * 343 * - bit 0 selects between INTx Routing Table Mapping Registers, 344 * 345 * - bit 3 selects the nibble within the INTx Routing Table Mapping Register, 346 * 347 * - bits 7:4 map to bits 3:0 of the PCI INTx Sensitivity Register. 348 */ 349 static int pirq_finali_get(struct pci_dev *router, struct pci_dev *dev, 350 int pirq) 351 { 352 static const u8 irqmap[16] = { 353 0, 9, 3, 10, 4, 5, 7, 6, 0, 11, 0, 12, 0, 14, 0, 15 354 }; 355 unsigned long flags; 356 u8 index; 357 u8 x; 358 359 index = (pirq & 1) << 1 | (pirq & 8) >> 3; 360 raw_spin_lock_irqsave(&pc_conf_lock, flags); 361 pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY); 362 x = irqmap[read_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, index)]; 363 pc_conf_set(PC_CONF_FINALI_LOCK, 0); 364 raw_spin_unlock_irqrestore(&pc_conf_lock, flags); 365 return x; 366 } 367 368 static int pirq_finali_set(struct pci_dev *router, struct pci_dev *dev, 369 int pirq, int irq) 370 { 371 static const u8 irqmap[16] = { 372 0, 0, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 373 }; 374 u8 val = irqmap[irq]; 375 unsigned long flags; 376 u8 index; 377 378 if (!val) 379 return 0; 380 381 index = (pirq & 1) << 1 | (pirq & 8) >> 3; 382 raw_spin_lock_irqsave(&pc_conf_lock, flags); 383 pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY); 384 write_pc_conf_nybble(PC_CONF_FINALI_PCI_INTX_RT1, index, val); 385 pc_conf_set(PC_CONF_FINALI_LOCK, 0); 386 raw_spin_unlock_irqrestore(&pc_conf_lock, flags); 387 return 1; 388 } 389 390 static int pirq_finali_lvl(struct pci_dev *router, struct pci_dev *dev, 391 int pirq, int irq) 392 { 393 u8 mask = ~((pirq & 0xf0u) >> 4); 394 unsigned long flags; 395 u8 trig; 396 397 elcr_set_level_irq(irq); 398 raw_spin_lock_irqsave(&pc_conf_lock, flags); 399 pc_conf_set(PC_CONF_FINALI_LOCK, PC_CONF_FINALI_LOCK_KEY); 400 trig = pc_conf_get(PC_CONF_FINALI_PCI_INTX_SENS); 401 trig &= mask; 402 pc_conf_set(PC_CONF_FINALI_PCI_INTX_SENS, trig); 403 pc_conf_set(PC_CONF_FINALI_LOCK, 0); 404 raw_spin_unlock_irqrestore(&pc_conf_lock, flags); 405 return 1; 406 } 407 408 /* 409 * Common IRQ routing practice: nibbles in config space, 410 * offset by some magic constant. 411 */ 412 static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr) 413 { 414 u8 x; 415 unsigned reg = offset + (nr >> 1); 416 417 pci_read_config_byte(router, reg, &x); 418 return (nr & 1) ? (x >> 4) : (x & 0xf); 419 } 420 421 static void write_config_nybble(struct pci_dev *router, unsigned offset, 422 unsigned nr, unsigned int val) 423 { 424 u8 x; 425 unsigned reg = offset + (nr >> 1); 426 427 pci_read_config_byte(router, reg, &x); 428 x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val); 429 pci_write_config_byte(router, reg, x); 430 } 431 432 /* 433 * ALI pirq entries are damn ugly, and completely undocumented. 434 * This has been figured out from pirq tables, and it's not a pretty 435 * picture. 436 */ 437 static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 438 { 439 static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 }; 440 441 WARN_ON_ONCE(pirq > 16); 442 return irqmap[read_config_nybble(router, 0x48, pirq-1)]; 443 } 444 445 static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 446 { 447 static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 }; 448 unsigned int val = irqmap[irq]; 449 450 WARN_ON_ONCE(pirq > 16); 451 if (val) { 452 write_config_nybble(router, 0x48, pirq-1, val); 453 return 1; 454 } 455 return 0; 456 } 457 458 /* 459 * PIRQ routing for the 82374EB/82374SB EISA System Component (ESC) 460 * ASIC used with the Intel 82420 and 82430 PCIsets. The ESC is not 461 * decoded in the PCI configuration space, so we identify it by the 462 * accompanying 82375EB/82375SB PCI-EISA Bridge (PCEB) ASIC. 463 * 464 * There are four PIRQ Route Control registers, available in the 465 * port I/O space accessible indirectly via the index/data register 466 * pair at 0x22/0x23, located at indices 0x60/0x61/0x62/0x63 for the 467 * PIRQ0/1/2/3# lines respectively. The semantics is the same as 468 * with the PIIX router. 469 * 470 * Accesses to the port I/O space concerned here need to be unlocked 471 * by writing the value of 0x0f to the ESC ID Register at index 0x02 472 * beforehand. Any other value written to said register prevents 473 * further accesses from reaching the register file, except for the 474 * ESC ID Register being written with 0x0f again. 475 * 476 * References: 477 * 478 * "82374EB/82374SB EISA System Component (ESC)", Intel Corporation, 479 * Order Number: 290476-004, March 1996 480 * 481 * "82375EB/82375SB PCI-EISA Bridge (PCEB)", Intel Corporation, Order 482 * Number: 290477-004, March 1996 483 */ 484 485 #define PC_CONF_I82374_ESC_ID 0x02u 486 #define PC_CONF_I82374_PIRQ_ROUTE_CONTROL 0x60u 487 488 #define PC_CONF_I82374_ESC_ID_KEY 0x0fu 489 490 static int pirq_esc_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 491 { 492 unsigned long flags; 493 int reg; 494 u8 x; 495 496 reg = pirq; 497 if (reg >= 1 && reg <= 4) 498 reg += PC_CONF_I82374_PIRQ_ROUTE_CONTROL - 1; 499 500 raw_spin_lock_irqsave(&pc_conf_lock, flags); 501 pc_conf_set(PC_CONF_I82374_ESC_ID, PC_CONF_I82374_ESC_ID_KEY); 502 x = pc_conf_get(reg); 503 pc_conf_set(PC_CONF_I82374_ESC_ID, 0); 504 raw_spin_unlock_irqrestore(&pc_conf_lock, flags); 505 return (x < 16) ? x : 0; 506 } 507 508 static int pirq_esc_set(struct pci_dev *router, struct pci_dev *dev, int pirq, 509 int irq) 510 { 511 unsigned long flags; 512 int reg; 513 514 reg = pirq; 515 if (reg >= 1 && reg <= 4) 516 reg += PC_CONF_I82374_PIRQ_ROUTE_CONTROL - 1; 517 518 raw_spin_lock_irqsave(&pc_conf_lock, flags); 519 pc_conf_set(PC_CONF_I82374_ESC_ID, PC_CONF_I82374_ESC_ID_KEY); 520 pc_conf_set(reg, irq); 521 pc_conf_set(PC_CONF_I82374_ESC_ID, 0); 522 raw_spin_unlock_irqrestore(&pc_conf_lock, flags); 523 return 1; 524 } 525 526 /* 527 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is 528 * just a pointer to the config space. 529 */ 530 static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 531 { 532 u8 x; 533 534 pci_read_config_byte(router, pirq, &x); 535 return (x < 16) ? x : 0; 536 } 537 538 static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 539 { 540 pci_write_config_byte(router, pirq, irq); 541 return 1; 542 } 543 544 /* 545 * PIRQ routing for the 82426EX ISA Bridge (IB) ASIC used with the 546 * Intel 82420EX PCIset. 547 * 548 * There are only two PIRQ Route Control registers, available in the 549 * combined 82425EX/82426EX PCI configuration space, at 0x66 and 0x67 550 * for the PIRQ0# and PIRQ1# lines respectively. The semantics is 551 * the same as with the PIIX router. 552 * 553 * References: 554 * 555 * "82420EX PCIset Data Sheet, 82425EX PCI System Controller (PSC) 556 * and 82426EX ISA Bridge (IB)", Intel Corporation, Order Number: 557 * 290488-004, December 1995 558 */ 559 560 #define PCI_I82426EX_PIRQ_ROUTE_CONTROL 0x66u 561 562 static int pirq_ib_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 563 { 564 int reg; 565 u8 x; 566 567 reg = pirq; 568 if (reg >= 1 && reg <= 2) 569 reg += PCI_I82426EX_PIRQ_ROUTE_CONTROL - 1; 570 571 pci_read_config_byte(router, reg, &x); 572 return (x < 16) ? x : 0; 573 } 574 575 static int pirq_ib_set(struct pci_dev *router, struct pci_dev *dev, int pirq, 576 int irq) 577 { 578 int reg; 579 580 reg = pirq; 581 if (reg >= 1 && reg <= 2) 582 reg += PCI_I82426EX_PIRQ_ROUTE_CONTROL - 1; 583 584 pci_write_config_byte(router, reg, irq); 585 return 1; 586 } 587 588 /* 589 * The VIA pirq rules are nibble-based, like ALI, 590 * but without the ugly irq number munging. 591 * However, PIRQD is in the upper instead of lower 4 bits. 592 */ 593 static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 594 { 595 return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq); 596 } 597 598 static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 599 { 600 write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq); 601 return 1; 602 } 603 604 /* 605 * The VIA pirq rules are nibble-based, like ALI, 606 * but without the ugly irq number munging. 607 * However, for 82C586, nibble map is different . 608 */ 609 static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 610 { 611 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 }; 612 613 WARN_ON_ONCE(pirq > 5); 614 return read_config_nybble(router, 0x55, pirqmap[pirq-1]); 615 } 616 617 static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 618 { 619 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 }; 620 621 WARN_ON_ONCE(pirq > 5); 622 write_config_nybble(router, 0x55, pirqmap[pirq-1], irq); 623 return 1; 624 } 625 626 /* 627 * ITE 8330G pirq rules are nibble-based 628 * FIXME: pirqmap may be { 1, 0, 3, 2 }, 629 * 2+3 are both mapped to irq 9 on my system 630 */ 631 static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 632 { 633 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 }; 634 635 WARN_ON_ONCE(pirq > 4); 636 return read_config_nybble(router, 0x43, pirqmap[pirq-1]); 637 } 638 639 static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 640 { 641 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 }; 642 643 WARN_ON_ONCE(pirq > 4); 644 write_config_nybble(router, 0x43, pirqmap[pirq-1], irq); 645 return 1; 646 } 647 648 /* 649 * OPTI: high four bits are nibble pointer.. 650 * I wonder what the low bits do? 651 */ 652 static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 653 { 654 return read_config_nybble(router, 0xb8, pirq >> 4); 655 } 656 657 static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 658 { 659 write_config_nybble(router, 0xb8, pirq >> 4, irq); 660 return 1; 661 } 662 663 /* 664 * Cyrix: nibble offset 0x5C 665 * 0x5C bits 7:4 is INTB bits 3:0 is INTA 666 * 0x5D bits 7:4 is INTD bits 3:0 is INTC 667 */ 668 static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 669 { 670 return read_config_nybble(router, 0x5C, (pirq-1)^1); 671 } 672 673 static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 674 { 675 write_config_nybble(router, 0x5C, (pirq-1)^1, irq); 676 return 1; 677 } 678 679 680 /* 681 * PIRQ routing for the SiS85C497 AT Bus Controller & Megacell (ATM) 682 * ISA bridge used with the SiS 85C496/497 486 Green PC VESA/ISA/PCI 683 * Chipset. 684 * 685 * There are four PCI INTx#-to-IRQ Link registers provided in the 686 * SiS85C497 part of the peculiar combined 85C496/497 configuration 687 * space decoded by the SiS85C496 PCI & CPU Memory Controller (PCM) 688 * host bridge, at 0xc0/0xc1/0xc2/0xc3 respectively for the PCI INT 689 * A/B/C/D lines. Bit 7 enables the respective link if set and bits 690 * 3:0 select the 8259A IRQ line as follows: 691 * 692 * 0000 : Reserved 693 * 0001 : Reserved 694 * 0010 : Reserved 695 * 0011 : IRQ3 696 * 0100 : IRQ4 697 * 0101 : IRQ5 698 * 0110 : IRQ6 699 * 0111 : IRQ7 700 * 1000 : Reserved 701 * 1001 : IRQ9 702 * 1010 : IRQ10 703 * 1011 : IRQ11 704 * 1100 : IRQ12 705 * 1101 : Reserved 706 * 1110 : IRQ14 707 * 1111 : IRQ15 708 * 709 * We avoid using a reserved value for disabled links, hence the 710 * choice of IRQ15 for that case. 711 * 712 * References: 713 * 714 * "486 Green PC VESA/ISA/PCI Chipset, SiS 85C496/497", Rev 3.0, 715 * Silicon Integrated Systems Corp., July 1995 716 */ 717 718 #define PCI_SIS497_INTA_TO_IRQ_LINK 0xc0u 719 720 #define PIRQ_SIS497_IRQ_MASK 0x0fu 721 #define PIRQ_SIS497_IRQ_ENABLE 0x80u 722 723 static int pirq_sis497_get(struct pci_dev *router, struct pci_dev *dev, 724 int pirq) 725 { 726 int reg; 727 u8 x; 728 729 reg = pirq; 730 if (reg >= 1 && reg <= 4) 731 reg += PCI_SIS497_INTA_TO_IRQ_LINK - 1; 732 733 pci_read_config_byte(router, reg, &x); 734 return (x & PIRQ_SIS497_IRQ_ENABLE) ? (x & PIRQ_SIS497_IRQ_MASK) : 0; 735 } 736 737 static int pirq_sis497_set(struct pci_dev *router, struct pci_dev *dev, 738 int pirq, int irq) 739 { 740 int reg; 741 u8 x; 742 743 reg = pirq; 744 if (reg >= 1 && reg <= 4) 745 reg += PCI_SIS497_INTA_TO_IRQ_LINK - 1; 746 747 pci_read_config_byte(router, reg, &x); 748 x &= ~(PIRQ_SIS497_IRQ_MASK | PIRQ_SIS497_IRQ_ENABLE); 749 x |= irq ? (PIRQ_SIS497_IRQ_ENABLE | irq) : PIRQ_SIS497_IRQ_MASK; 750 pci_write_config_byte(router, reg, x); 751 return 1; 752 } 753 754 /* 755 * PIRQ routing for SiS 85C503 router used in several SiS chipsets. 756 * We have to deal with the following issues here: 757 * - vendors have different ideas about the meaning of link values 758 * - some onboard devices (integrated in the chipset) have special 759 * links and are thus routed differently (i.e. not via PCI INTA-INTD) 760 * - different revision of the router have a different layout for 761 * the routing registers, particularly for the onchip devices 762 * 763 * For all routing registers the common thing is we have one byte 764 * per routeable link which is defined as: 765 * bit 7 IRQ mapping enabled (0) or disabled (1) 766 * bits [6:4] reserved (sometimes used for onchip devices) 767 * bits [3:0] IRQ to map to 768 * allowed: 3-7, 9-12, 14-15 769 * reserved: 0, 1, 2, 8, 13 770 * 771 * The config-space registers located at 0x41/0x42/0x43/0x44 are 772 * always used to route the normal PCI INT A/B/C/D respectively. 773 * Apparently there are systems implementing PCI routing table using 774 * link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D. 775 * We try our best to handle both link mappings. 776 * 777 * Currently (2003-05-21) it appears most SiS chipsets follow the 778 * definition of routing registers from the SiS-5595 southbridge. 779 * According to the SiS 5595 datasheets the revision id's of the 780 * router (ISA-bridge) should be 0x01 or 0xb0. 781 * 782 * Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1. 783 * Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets. 784 * They seem to work with the current routing code. However there is 785 * some concern because of the two USB-OHCI HCs (original SiS 5595 786 * had only one). YMMV. 787 * 788 * Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1: 789 * 790 * 0x61: IDEIRQ: 791 * bits [6:5] must be written 01 792 * bit 4 channel-select primary (0), secondary (1) 793 * 794 * 0x62: USBIRQ: 795 * bit 6 OHCI function disabled (0), enabled (1) 796 * 797 * 0x6a: ACPI/SCI IRQ: bits 4-6 reserved 798 * 799 * 0x7e: Data Acq. Module IRQ - bits 4-6 reserved 800 * 801 * We support USBIRQ (in addition to INTA-INTD) and keep the 802 * IDE, ACPI and DAQ routing untouched as set by the BIOS. 803 * 804 * Currently the only reported exception is the new SiS 65x chipset 805 * which includes the SiS 69x southbridge. Here we have the 85C503 806 * router revision 0x04 and there are changes in the register layout 807 * mostly related to the different USB HCs with USB 2.0 support. 808 * 809 * Onchip routing for router rev-id 0x04 (try-and-error observation) 810 * 811 * 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs 812 * bit 6-4 are probably unused, not like 5595 813 */ 814 815 #define PIRQ_SIS503_IRQ_MASK 0x0f 816 #define PIRQ_SIS503_IRQ_DISABLE 0x80 817 #define PIRQ_SIS503_USB_ENABLE 0x40 818 819 static int pirq_sis503_get(struct pci_dev *router, struct pci_dev *dev, 820 int pirq) 821 { 822 u8 x; 823 int reg; 824 825 reg = pirq; 826 if (reg >= 0x01 && reg <= 0x04) 827 reg += 0x40; 828 pci_read_config_byte(router, reg, &x); 829 return (x & PIRQ_SIS503_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS503_IRQ_MASK); 830 } 831 832 static int pirq_sis503_set(struct pci_dev *router, struct pci_dev *dev, 833 int pirq, int irq) 834 { 835 u8 x; 836 int reg; 837 838 reg = pirq; 839 if (reg >= 0x01 && reg <= 0x04) 840 reg += 0x40; 841 pci_read_config_byte(router, reg, &x); 842 x &= ~(PIRQ_SIS503_IRQ_MASK | PIRQ_SIS503_IRQ_DISABLE); 843 x |= irq ? irq : PIRQ_SIS503_IRQ_DISABLE; 844 pci_write_config_byte(router, reg, x); 845 return 1; 846 } 847 848 849 /* 850 * VLSI: nibble offset 0x74 - educated guess due to routing table and 851 * config space of VLSI 82C534 PCI-bridge/router (1004:0102) 852 * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard 853 * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6 854 * for the busbridge to the docking station. 855 */ 856 857 static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 858 { 859 WARN_ON_ONCE(pirq >= 9); 860 if (pirq > 8) { 861 dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq); 862 return 0; 863 } 864 return read_config_nybble(router, 0x74, pirq-1); 865 } 866 867 static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 868 { 869 WARN_ON_ONCE(pirq >= 9); 870 if (pirq > 8) { 871 dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq); 872 return 0; 873 } 874 write_config_nybble(router, 0x74, pirq-1, irq); 875 return 1; 876 } 877 878 /* 879 * ServerWorks: PCI interrupts mapped to system IRQ lines through Index 880 * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register 881 * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect 882 * register is a straight binary coding of desired PIC IRQ (low nibble). 883 * 884 * The 'link' value in the PIRQ table is already in the correct format 885 * for the Index register. There are some special index values: 886 * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1, 887 * and 0x03 for SMBus. 888 */ 889 static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 890 { 891 outb(pirq, 0xc00); 892 return inb(0xc01) & 0xf; 893 } 894 895 static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev, 896 int pirq, int irq) 897 { 898 outb(pirq, 0xc00); 899 outb(irq, 0xc01); 900 return 1; 901 } 902 903 /* Support for AMD756 PCI IRQ Routing 904 * Jhon H. Caicedo <jhcaiced@osso.org.co> 905 * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced) 906 * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced) 907 * The AMD756 pirq rules are nibble-based 908 * offset 0x56 0-3 PIRQA 4-7 PIRQB 909 * offset 0x57 0-3 PIRQC 4-7 PIRQD 910 */ 911 static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 912 { 913 u8 irq; 914 irq = 0; 915 if (pirq <= 4) 916 irq = read_config_nybble(router, 0x56, pirq - 1); 917 dev_info(&dev->dev, 918 "AMD756: dev [%04x:%04x], router PIRQ %d get IRQ %d\n", 919 dev->vendor, dev->device, pirq, irq); 920 return irq; 921 } 922 923 static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 924 { 925 dev_info(&dev->dev, 926 "AMD756: dev [%04x:%04x], router PIRQ %d set IRQ %d\n", 927 dev->vendor, dev->device, pirq, irq); 928 if (pirq <= 4) 929 write_config_nybble(router, 0x56, pirq - 1, irq); 930 return 1; 931 } 932 933 /* 934 * PicoPower PT86C523 935 */ 936 static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq) 937 { 938 outb(0x10 + ((pirq - 1) >> 1), 0x24); 939 return ((pirq - 1) & 1) ? (inb(0x26) >> 4) : (inb(0x26) & 0xf); 940 } 941 942 static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq, 943 int irq) 944 { 945 unsigned int x; 946 outb(0x10 + ((pirq - 1) >> 1), 0x24); 947 x = inb(0x26); 948 x = ((pirq - 1) & 1) ? ((x & 0x0f) | (irq << 4)) : ((x & 0xf0) | (irq)); 949 outb(x, 0x26); 950 return 1; 951 } 952 953 #ifdef CONFIG_PCI_BIOS 954 955 static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq) 956 { 957 struct pci_dev *bridge; 958 int pin = pci_get_interrupt_pin(dev, &bridge); 959 return pcibios_set_irq_routing(bridge, pin - 1, irq); 960 } 961 962 #endif 963 964 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 965 { 966 static struct pci_device_id __initdata pirq_440gx[] = { 967 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) }, 968 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) }, 969 { }, 970 }; 971 972 /* 440GX has a proprietary PIRQ router -- don't use it */ 973 if (pci_dev_present(pirq_440gx)) 974 return 0; 975 976 switch (device) { 977 case PCI_DEVICE_ID_INTEL_82375: 978 r->name = "PCEB/ESC"; 979 r->get = pirq_esc_get; 980 r->set = pirq_esc_set; 981 return 1; 982 case PCI_DEVICE_ID_INTEL_82371FB_0: 983 case PCI_DEVICE_ID_INTEL_82371SB_0: 984 case PCI_DEVICE_ID_INTEL_82371AB_0: 985 case PCI_DEVICE_ID_INTEL_82371MX: 986 case PCI_DEVICE_ID_INTEL_82443MX_0: 987 case PCI_DEVICE_ID_INTEL_82801AA_0: 988 case PCI_DEVICE_ID_INTEL_82801AB_0: 989 case PCI_DEVICE_ID_INTEL_82801BA_0: 990 case PCI_DEVICE_ID_INTEL_82801BA_10: 991 case PCI_DEVICE_ID_INTEL_82801CA_0: 992 case PCI_DEVICE_ID_INTEL_82801CA_12: 993 case PCI_DEVICE_ID_INTEL_82801DB_0: 994 case PCI_DEVICE_ID_INTEL_82801E_0: 995 case PCI_DEVICE_ID_INTEL_82801EB_0: 996 case PCI_DEVICE_ID_INTEL_ESB_1: 997 case PCI_DEVICE_ID_INTEL_ICH6_0: 998 case PCI_DEVICE_ID_INTEL_ICH6_1: 999 case PCI_DEVICE_ID_INTEL_ICH7_0: 1000 case PCI_DEVICE_ID_INTEL_ICH7_1: 1001 case PCI_DEVICE_ID_INTEL_ICH7_30: 1002 case PCI_DEVICE_ID_INTEL_ICH7_31: 1003 case PCI_DEVICE_ID_INTEL_TGP_LPC: 1004 case PCI_DEVICE_ID_INTEL_ESB2_0: 1005 case PCI_DEVICE_ID_INTEL_ICH8_0: 1006 case PCI_DEVICE_ID_INTEL_ICH8_1: 1007 case PCI_DEVICE_ID_INTEL_ICH8_2: 1008 case PCI_DEVICE_ID_INTEL_ICH8_3: 1009 case PCI_DEVICE_ID_INTEL_ICH8_4: 1010 case PCI_DEVICE_ID_INTEL_ICH9_0: 1011 case PCI_DEVICE_ID_INTEL_ICH9_1: 1012 case PCI_DEVICE_ID_INTEL_ICH9_2: 1013 case PCI_DEVICE_ID_INTEL_ICH9_3: 1014 case PCI_DEVICE_ID_INTEL_ICH9_4: 1015 case PCI_DEVICE_ID_INTEL_ICH9_5: 1016 case PCI_DEVICE_ID_INTEL_EP80579_0: 1017 case PCI_DEVICE_ID_INTEL_ICH10_0: 1018 case PCI_DEVICE_ID_INTEL_ICH10_1: 1019 case PCI_DEVICE_ID_INTEL_ICH10_2: 1020 case PCI_DEVICE_ID_INTEL_ICH10_3: 1021 case PCI_DEVICE_ID_INTEL_PATSBURG_LPC_0: 1022 case PCI_DEVICE_ID_INTEL_PATSBURG_LPC_1: 1023 r->name = "PIIX/ICH"; 1024 r->get = pirq_piix_get; 1025 r->set = pirq_piix_set; 1026 return 1; 1027 case PCI_DEVICE_ID_INTEL_82425: 1028 r->name = "PSC/IB"; 1029 r->get = pirq_ib_get; 1030 r->set = pirq_ib_set; 1031 return 1; 1032 } 1033 1034 if ((device >= PCI_DEVICE_ID_INTEL_5_3400_SERIES_LPC_MIN && 1035 device <= PCI_DEVICE_ID_INTEL_5_3400_SERIES_LPC_MAX) 1036 || (device >= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MIN && 1037 device <= PCI_DEVICE_ID_INTEL_COUGARPOINT_LPC_MAX) 1038 || (device >= PCI_DEVICE_ID_INTEL_DH89XXCC_LPC_MIN && 1039 device <= PCI_DEVICE_ID_INTEL_DH89XXCC_LPC_MAX) 1040 || (device >= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MIN && 1041 device <= PCI_DEVICE_ID_INTEL_PANTHERPOINT_LPC_MAX)) { 1042 r->name = "PIIX/ICH"; 1043 r->get = pirq_piix_get; 1044 r->set = pirq_piix_set; 1045 return 1; 1046 } 1047 1048 return 0; 1049 } 1050 1051 static __init int via_router_probe(struct irq_router *r, 1052 struct pci_dev *router, u16 device) 1053 { 1054 /* FIXME: We should move some of the quirk fixup stuff here */ 1055 1056 /* 1057 * workarounds for some buggy BIOSes 1058 */ 1059 if (device == PCI_DEVICE_ID_VIA_82C586_0) { 1060 switch (router->device) { 1061 case PCI_DEVICE_ID_VIA_82C686: 1062 /* 1063 * Asus k7m bios wrongly reports 82C686A 1064 * as 586-compatible 1065 */ 1066 device = PCI_DEVICE_ID_VIA_82C686; 1067 break; 1068 case PCI_DEVICE_ID_VIA_8235: 1069 /** 1070 * Asus a7v-x bios wrongly reports 8235 1071 * as 586-compatible 1072 */ 1073 device = PCI_DEVICE_ID_VIA_8235; 1074 break; 1075 case PCI_DEVICE_ID_VIA_8237: 1076 /** 1077 * Asus a7v600 bios wrongly reports 8237 1078 * as 586-compatible 1079 */ 1080 device = PCI_DEVICE_ID_VIA_8237; 1081 break; 1082 } 1083 } 1084 1085 switch (device) { 1086 case PCI_DEVICE_ID_VIA_82C586_0: 1087 r->name = "VIA"; 1088 r->get = pirq_via586_get; 1089 r->set = pirq_via586_set; 1090 return 1; 1091 case PCI_DEVICE_ID_VIA_82C596: 1092 case PCI_DEVICE_ID_VIA_82C686: 1093 case PCI_DEVICE_ID_VIA_8231: 1094 case PCI_DEVICE_ID_VIA_8233A: 1095 case PCI_DEVICE_ID_VIA_8235: 1096 case PCI_DEVICE_ID_VIA_8237: 1097 /* FIXME: add new ones for 8233/5 */ 1098 r->name = "VIA"; 1099 r->get = pirq_via_get; 1100 r->set = pirq_via_set; 1101 return 1; 1102 } 1103 return 0; 1104 } 1105 1106 static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1107 { 1108 switch (device) { 1109 case PCI_DEVICE_ID_VLSI_82C534: 1110 r->name = "VLSI 82C534"; 1111 r->get = pirq_vlsi_get; 1112 r->set = pirq_vlsi_set; 1113 return 1; 1114 } 1115 return 0; 1116 } 1117 1118 1119 static __init int serverworks_router_probe(struct irq_router *r, 1120 struct pci_dev *router, u16 device) 1121 { 1122 switch (device) { 1123 case PCI_DEVICE_ID_SERVERWORKS_OSB4: 1124 case PCI_DEVICE_ID_SERVERWORKS_CSB5: 1125 r->name = "ServerWorks"; 1126 r->get = pirq_serverworks_get; 1127 r->set = pirq_serverworks_set; 1128 return 1; 1129 } 1130 return 0; 1131 } 1132 1133 static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1134 { 1135 switch (device) { 1136 case PCI_DEVICE_ID_SI_496: 1137 r->name = "SiS85C497"; 1138 r->get = pirq_sis497_get; 1139 r->set = pirq_sis497_set; 1140 return 1; 1141 case PCI_DEVICE_ID_SI_503: 1142 r->name = "SiS85C503"; 1143 r->get = pirq_sis503_get; 1144 r->set = pirq_sis503_set; 1145 return 1; 1146 } 1147 return 0; 1148 } 1149 1150 static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1151 { 1152 switch (device) { 1153 case PCI_DEVICE_ID_CYRIX_5520: 1154 r->name = "NatSemi"; 1155 r->get = pirq_cyrix_get; 1156 r->set = pirq_cyrix_set; 1157 return 1; 1158 } 1159 return 0; 1160 } 1161 1162 static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1163 { 1164 switch (device) { 1165 case PCI_DEVICE_ID_OPTI_82C700: 1166 r->name = "OPTI"; 1167 r->get = pirq_opti_get; 1168 r->set = pirq_opti_set; 1169 return 1; 1170 } 1171 return 0; 1172 } 1173 1174 static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1175 { 1176 switch (device) { 1177 case PCI_DEVICE_ID_ITE_IT8330G_0: 1178 r->name = "ITE"; 1179 r->get = pirq_ite_get; 1180 r->set = pirq_ite_set; 1181 return 1; 1182 } 1183 return 0; 1184 } 1185 1186 static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1187 { 1188 switch (device) { 1189 case PCI_DEVICE_ID_AL_M1489: 1190 r->name = "FinALi"; 1191 r->get = pirq_finali_get; 1192 r->set = pirq_finali_set; 1193 r->lvl = pirq_finali_lvl; 1194 return 1; 1195 case PCI_DEVICE_ID_AL_M1533: 1196 case PCI_DEVICE_ID_AL_M1563: 1197 r->name = "ALI"; 1198 r->get = pirq_ali_get; 1199 r->set = pirq_ali_set; 1200 return 1; 1201 } 1202 return 0; 1203 } 1204 1205 static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1206 { 1207 switch (device) { 1208 case PCI_DEVICE_ID_AMD_VIPER_740B: 1209 r->name = "AMD756"; 1210 break; 1211 case PCI_DEVICE_ID_AMD_VIPER_7413: 1212 r->name = "AMD766"; 1213 break; 1214 case PCI_DEVICE_ID_AMD_VIPER_7443: 1215 r->name = "AMD768"; 1216 break; 1217 default: 1218 return 0; 1219 } 1220 r->get = pirq_amd756_get; 1221 r->set = pirq_amd756_set; 1222 return 1; 1223 } 1224 1225 static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device) 1226 { 1227 switch (device) { 1228 case PCI_DEVICE_ID_PICOPOWER_PT86C523: 1229 r->name = "PicoPower PT86C523"; 1230 r->get = pirq_pico_get; 1231 r->set = pirq_pico_set; 1232 return 1; 1233 1234 case PCI_DEVICE_ID_PICOPOWER_PT86C523BBP: 1235 r->name = "PicoPower PT86C523 rev. BB+"; 1236 r->get = pirq_pico_get; 1237 r->set = pirq_pico_set; 1238 return 1; 1239 } 1240 return 0; 1241 } 1242 1243 static __initdata struct irq_router_handler pirq_routers[] = { 1244 { PCI_VENDOR_ID_INTEL, intel_router_probe }, 1245 { PCI_VENDOR_ID_AL, ali_router_probe }, 1246 { PCI_VENDOR_ID_ITE, ite_router_probe }, 1247 { PCI_VENDOR_ID_VIA, via_router_probe }, 1248 { PCI_VENDOR_ID_OPTI, opti_router_probe }, 1249 { PCI_VENDOR_ID_SI, sis_router_probe }, 1250 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe }, 1251 { PCI_VENDOR_ID_VLSI, vlsi_router_probe }, 1252 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe }, 1253 { PCI_VENDOR_ID_AMD, amd_router_probe }, 1254 { PCI_VENDOR_ID_PICOPOWER, pico_router_probe }, 1255 /* Someone with docs needs to add the ATI Radeon IGP */ 1256 { 0, NULL } 1257 }; 1258 static struct irq_router pirq_router; 1259 static struct pci_dev *pirq_router_dev; 1260 1261 1262 /* 1263 * FIXME: should we have an option to say "generic for 1264 * chipset" ? 1265 */ 1266 1267 static bool __init pirq_try_router(struct irq_router *r, 1268 struct irq_routing_table *rt, 1269 struct pci_dev *dev) 1270 { 1271 struct irq_router_handler *h; 1272 1273 DBG(KERN_DEBUG "PCI: Trying IRQ router for [%04x:%04x]\n", 1274 dev->vendor, dev->device); 1275 1276 for (h = pirq_routers; h->vendor; h++) { 1277 /* First look for a router match */ 1278 if (rt->rtr_vendor == h->vendor && 1279 h->probe(r, dev, rt->rtr_device)) 1280 return true; 1281 /* Fall back to a device match */ 1282 if (dev->vendor == h->vendor && 1283 h->probe(r, dev, dev->device)) 1284 return true; 1285 } 1286 return false; 1287 } 1288 1289 static void __init pirq_find_router(struct irq_router *r) 1290 { 1291 struct irq_routing_table *rt = pirq_table; 1292 struct pci_dev *dev; 1293 1294 #ifdef CONFIG_PCI_BIOS 1295 if (!rt->signature) { 1296 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n"); 1297 r->set = pirq_bios_set; 1298 r->name = "BIOS"; 1299 return; 1300 } 1301 #endif 1302 1303 /* Default unless a driver reloads it */ 1304 r->name = "default"; 1305 r->get = NULL; 1306 r->set = NULL; 1307 1308 DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for [%04x:%04x]\n", 1309 rt->rtr_vendor, rt->rtr_device); 1310 1311 /* Use any vendor:device provided by the routing table or try all. */ 1312 if (rt->rtr_vendor) { 1313 dev = pci_get_domain_bus_and_slot(0, rt->rtr_bus, 1314 rt->rtr_devfn); 1315 if (dev && pirq_try_router(r, rt, dev)) 1316 pirq_router_dev = dev; 1317 } else { 1318 dev = NULL; 1319 for_each_pci_dev(dev) { 1320 if (pirq_try_router(r, rt, dev)) { 1321 pirq_router_dev = dev; 1322 break; 1323 } 1324 } 1325 } 1326 1327 if (pirq_router_dev) 1328 dev_info(&pirq_router_dev->dev, "%s IRQ router [%04x:%04x]\n", 1329 pirq_router.name, 1330 pirq_router_dev->vendor, pirq_router_dev->device); 1331 else 1332 DBG(KERN_DEBUG "PCI: Interrupt router not found at " 1333 "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn); 1334 1335 /* The device remains referenced for the kernel lifetime */ 1336 } 1337 1338 /* 1339 * We're supposed to match on the PCI device only and not the function, 1340 * but some BIOSes build their tables with the PCI function included 1341 * for motherboard devices, so if a complete match is found, then give 1342 * it precedence over a slot match. 1343 */ 1344 static struct irq_info *pirq_get_dev_info(struct pci_dev *dev) 1345 { 1346 struct irq_routing_table *rt = pirq_table; 1347 int entries = (rt->size - sizeof(struct irq_routing_table)) / 1348 sizeof(struct irq_info); 1349 struct irq_info *slotinfo = NULL; 1350 struct irq_info *info; 1351 1352 for (info = rt->slots; entries--; info++) 1353 if (info->bus == dev->bus->number) { 1354 if (info->devfn == dev->devfn) 1355 return info; 1356 if (!slotinfo && 1357 PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn)) 1358 slotinfo = info; 1359 } 1360 return slotinfo; 1361 } 1362 1363 /* 1364 * Buses behind bridges are typically not listed in the PIRQ routing table. 1365 * Do the usual dance then and walk the tree of bridges up adjusting the 1366 * pin number accordingly on the way until the originating root bus device 1367 * has been reached and then use its routing information. 1368 */ 1369 static struct irq_info *pirq_get_info(struct pci_dev *dev, u8 *pin) 1370 { 1371 struct pci_dev *temp_dev = dev; 1372 struct irq_info *info; 1373 u8 temp_pin = *pin; 1374 u8 dpin = temp_pin; 1375 1376 info = pirq_get_dev_info(dev); 1377 while (!info && temp_dev->bus->parent) { 1378 struct pci_dev *bridge = temp_dev->bus->self; 1379 1380 temp_pin = pci_swizzle_interrupt_pin(temp_dev, temp_pin); 1381 info = pirq_get_dev_info(bridge); 1382 if (info) 1383 dev_warn(&dev->dev, 1384 "using bridge %s INT %c to get INT %c\n", 1385 pci_name(bridge), 1386 'A' + temp_pin - 1, 'A' + dpin - 1); 1387 1388 temp_dev = bridge; 1389 } 1390 *pin = temp_pin; 1391 return info; 1392 } 1393 1394 static int pcibios_lookup_irq(struct pci_dev *dev, int assign) 1395 { 1396 struct irq_info *info; 1397 int i, pirq, newirq; 1398 u8 dpin, pin; 1399 int irq = 0; 1400 u32 mask; 1401 struct irq_router *r = &pirq_router; 1402 struct pci_dev *dev2 = NULL; 1403 char *msg = NULL; 1404 1405 /* Find IRQ pin */ 1406 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &dpin); 1407 if (!dpin) { 1408 dev_dbg(&dev->dev, "no interrupt pin\n"); 1409 return 0; 1410 } 1411 1412 if (io_apic_assign_pci_irqs) 1413 return 0; 1414 1415 /* Find IRQ routing entry */ 1416 1417 if (!pirq_table) 1418 return 0; 1419 1420 pin = dpin; 1421 info = pirq_get_info(dev, &pin); 1422 if (!info) { 1423 dev_dbg(&dev->dev, "PCI INT %c not found in routing table\n", 1424 'A' + dpin - 1); 1425 return 0; 1426 } 1427 pirq = info->irq[pin - 1].link; 1428 mask = info->irq[pin - 1].bitmap; 1429 if (!pirq) { 1430 dev_dbg(&dev->dev, "PCI INT %c not routed\n", 'A' + dpin - 1); 1431 return 0; 1432 } 1433 dev_dbg(&dev->dev, "PCI INT %c -> PIRQ %02x, mask %04x, excl %04x", 1434 'A' + dpin - 1, pirq, mask, pirq_table->exclusive_irqs); 1435 mask &= pcibios_irq_mask; 1436 1437 /* Work around broken HP Pavilion Notebooks which assign USB to 1438 IRQ 9 even though it is actually wired to IRQ 11 */ 1439 1440 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) { 1441 dev->irq = 11; 1442 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11); 1443 r->set(pirq_router_dev, dev, pirq, 11); 1444 } 1445 1446 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */ 1447 if (acer_tm360_irqrouting && dev->irq == 11 && 1448 dev->vendor == PCI_VENDOR_ID_O2) { 1449 pirq = 0x68; 1450 mask = 0x400; 1451 dev->irq = r->get(pirq_router_dev, dev, pirq); 1452 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq); 1453 } 1454 1455 /* 1456 * Find the best IRQ to assign: use the one 1457 * reported by the device if possible. 1458 */ 1459 newirq = dev->irq; 1460 if (newirq && !((1 << newirq) & mask)) { 1461 if (pci_probe & PCI_USE_PIRQ_MASK) 1462 newirq = 0; 1463 else 1464 dev_warn(&dev->dev, "IRQ %d doesn't match PIRQ mask " 1465 "%#x; try pci=usepirqmask\n", newirq, mask); 1466 } 1467 if (!newirq && assign) { 1468 for (i = 0; i < 16; i++) { 1469 if (!(mask & (1 << i))) 1470 continue; 1471 if (pirq_penalty[i] < pirq_penalty[newirq] && 1472 can_request_irq(i, IRQF_SHARED)) 1473 newirq = i; 1474 } 1475 } 1476 dev_dbg(&dev->dev, "PCI INT %c -> newirq %d", 'A' + dpin - 1, newirq); 1477 1478 /* Check if it is hardcoded */ 1479 if ((pirq & 0xf0) == 0xf0) { 1480 irq = pirq & 0xf; 1481 msg = "hardcoded"; 1482 } else if (r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \ 1483 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask))) { 1484 msg = "found"; 1485 if (r->lvl) 1486 r->lvl(pirq_router_dev, dev, pirq, irq); 1487 else 1488 elcr_set_level_irq(irq); 1489 } else if (newirq && r->set && 1490 (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) { 1491 if (r->set(pirq_router_dev, dev, pirq, newirq)) { 1492 if (r->lvl) 1493 r->lvl(pirq_router_dev, dev, pirq, newirq); 1494 else 1495 elcr_set_level_irq(newirq); 1496 msg = "assigned"; 1497 irq = newirq; 1498 } 1499 } 1500 1501 if (!irq) { 1502 if (newirq && mask == (1 << newirq)) { 1503 msg = "guessed"; 1504 irq = newirq; 1505 } else { 1506 dev_dbg(&dev->dev, "can't route interrupt\n"); 1507 return 0; 1508 } 1509 } 1510 dev_info(&dev->dev, "%s PCI INT %c -> IRQ %d\n", 1511 msg, 'A' + dpin - 1, irq); 1512 1513 /* Update IRQ for all devices with the same pirq value */ 1514 for_each_pci_dev(dev2) { 1515 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &dpin); 1516 if (!dpin) 1517 continue; 1518 1519 pin = dpin; 1520 info = pirq_get_info(dev2, &pin); 1521 if (!info) 1522 continue; 1523 if (info->irq[pin - 1].link == pirq) { 1524 /* 1525 * We refuse to override the dev->irq 1526 * information. Give a warning! 1527 */ 1528 if (dev2->irq && dev2->irq != irq && \ 1529 (!(pci_probe & PCI_USE_PIRQ_MASK) || \ 1530 ((1 << dev2->irq) & mask))) { 1531 #ifndef CONFIG_PCI_MSI 1532 dev_info(&dev2->dev, "IRQ routing conflict: " 1533 "have IRQ %d, want IRQ %d\n", 1534 dev2->irq, irq); 1535 #endif 1536 continue; 1537 } 1538 dev2->irq = irq; 1539 pirq_penalty[irq]++; 1540 if (dev != dev2) 1541 dev_info(&dev->dev, "sharing IRQ %d with %s\n", 1542 irq, pci_name(dev2)); 1543 } 1544 } 1545 return 1; 1546 } 1547 1548 void __init pcibios_fixup_irqs(void) 1549 { 1550 struct pci_dev *dev = NULL; 1551 u8 pin; 1552 1553 DBG(KERN_DEBUG "PCI: IRQ fixup\n"); 1554 for_each_pci_dev(dev) { 1555 /* 1556 * If the BIOS has set an out of range IRQ number, just 1557 * ignore it. Also keep track of which IRQ's are 1558 * already in use. 1559 */ 1560 if (dev->irq >= 16) { 1561 dev_dbg(&dev->dev, "ignoring bogus IRQ %d\n", dev->irq); 1562 dev->irq = 0; 1563 } 1564 /* 1565 * If the IRQ is already assigned to a PCI device, 1566 * ignore its ISA use penalty 1567 */ 1568 if (pirq_penalty[dev->irq] >= 100 && 1569 pirq_penalty[dev->irq] < 100000) 1570 pirq_penalty[dev->irq] = 0; 1571 pirq_penalty[dev->irq]++; 1572 } 1573 1574 if (io_apic_assign_pci_irqs) 1575 return; 1576 1577 dev = NULL; 1578 for_each_pci_dev(dev) { 1579 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); 1580 if (!pin) 1581 continue; 1582 1583 /* 1584 * Still no IRQ? Try to lookup one... 1585 */ 1586 if (!dev->irq) 1587 pcibios_lookup_irq(dev, 0); 1588 } 1589 } 1590 1591 /* 1592 * Work around broken HP Pavilion Notebooks which assign USB to 1593 * IRQ 9 even though it is actually wired to IRQ 11 1594 */ 1595 static int __init fix_broken_hp_bios_irq9(const struct dmi_system_id *d) 1596 { 1597 if (!broken_hp_bios_irq9) { 1598 broken_hp_bios_irq9 = 1; 1599 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", 1600 d->ident); 1601 } 1602 return 0; 1603 } 1604 1605 /* 1606 * Work around broken Acer TravelMate 360 Notebooks which assign 1607 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10 1608 */ 1609 static int __init fix_acer_tm360_irqrouting(const struct dmi_system_id *d) 1610 { 1611 if (!acer_tm360_irqrouting) { 1612 acer_tm360_irqrouting = 1; 1613 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", 1614 d->ident); 1615 } 1616 return 0; 1617 } 1618 1619 static const struct dmi_system_id pciirq_dmi_table[] __initconst = { 1620 { 1621 .callback = fix_broken_hp_bios_irq9, 1622 .ident = "HP Pavilion N5400 Series Laptop", 1623 .matches = { 1624 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 1625 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"), 1626 DMI_MATCH(DMI_PRODUCT_VERSION, 1627 "HP Pavilion Notebook Model GE"), 1628 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"), 1629 }, 1630 }, 1631 { 1632 .callback = fix_acer_tm360_irqrouting, 1633 .ident = "Acer TravelMate 36x Laptop", 1634 .matches = { 1635 DMI_MATCH(DMI_SYS_VENDOR, "Acer"), 1636 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"), 1637 }, 1638 }, 1639 { } 1640 }; 1641 1642 void __init pcibios_irq_init(void) 1643 { 1644 struct irq_routing_table *rtable = NULL; 1645 1646 DBG(KERN_DEBUG "PCI: IRQ init\n"); 1647 1648 if (raw_pci_ops == NULL) 1649 return; 1650 1651 dmi_check_system(pciirq_dmi_table); 1652 1653 pirq_table = pirq_find_routing_table(); 1654 1655 #ifdef CONFIG_PCI_BIOS 1656 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN)) { 1657 pirq_table = pcibios_get_irq_routing_table(); 1658 rtable = pirq_table; 1659 } 1660 #endif 1661 if (pirq_table) { 1662 pirq_peer_trick(); 1663 pirq_find_router(&pirq_router); 1664 if (pirq_table->exclusive_irqs) { 1665 int i; 1666 for (i = 0; i < 16; i++) 1667 if (!(pirq_table->exclusive_irqs & (1 << i))) 1668 pirq_penalty[i] += 100; 1669 } 1670 /* 1671 * If we're using the I/O APIC, avoid using the PCI IRQ 1672 * routing table 1673 */ 1674 if (io_apic_assign_pci_irqs) { 1675 kfree(rtable); 1676 pirq_table = NULL; 1677 } 1678 } 1679 1680 x86_init.pci.fixup_irqs(); 1681 1682 if (io_apic_assign_pci_irqs && pci_routeirq) { 1683 struct pci_dev *dev = NULL; 1684 /* 1685 * PCI IRQ routing is set up by pci_enable_device(), but we 1686 * also do it here in case there are still broken drivers that 1687 * don't use pci_enable_device(). 1688 */ 1689 printk(KERN_INFO "PCI: Routing PCI interrupts for all devices because \"pci=routeirq\" specified\n"); 1690 for_each_pci_dev(dev) 1691 pirq_enable_irq(dev); 1692 } 1693 } 1694 1695 static void pirq_penalize_isa_irq(int irq, int active) 1696 { 1697 /* 1698 * If any ISAPnP device reports an IRQ in its list of possible 1699 * IRQ's, we try to avoid assigning it to PCI devices. 1700 */ 1701 if (irq < 16) { 1702 if (active) 1703 pirq_penalty[irq] += 1000; 1704 else 1705 pirq_penalty[irq] += 100; 1706 } 1707 } 1708 1709 void pcibios_penalize_isa_irq(int irq, int active) 1710 { 1711 #ifdef CONFIG_ACPI 1712 if (!acpi_noirq) 1713 acpi_penalize_isa_irq(irq, active); 1714 else 1715 #endif 1716 pirq_penalize_isa_irq(irq, active); 1717 } 1718 1719 static int pirq_enable_irq(struct pci_dev *dev) 1720 { 1721 u8 pin = 0; 1722 1723 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin); 1724 if (pin && !pcibios_lookup_irq(dev, 1)) { 1725 char *msg = ""; 1726 1727 if (!io_apic_assign_pci_irqs && dev->irq) 1728 return 0; 1729 1730 if (io_apic_assign_pci_irqs) { 1731 #ifdef CONFIG_X86_IO_APIC 1732 struct pci_dev *temp_dev; 1733 int irq; 1734 1735 if (dev->irq_managed && dev->irq > 0) 1736 return 0; 1737 1738 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, 1739 PCI_SLOT(dev->devfn), pin - 1); 1740 /* 1741 * Busses behind bridges are typically not listed in the MP-table. 1742 * In this case we have to look up the IRQ based on the parent bus, 1743 * parent slot, and pin number. The SMP code detects such bridged 1744 * busses itself so we should get into this branch reliably. 1745 */ 1746 temp_dev = dev; 1747 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */ 1748 struct pci_dev *bridge = dev->bus->self; 1749 1750 pin = pci_swizzle_interrupt_pin(dev, pin); 1751 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number, 1752 PCI_SLOT(bridge->devfn), 1753 pin - 1); 1754 if (irq >= 0) 1755 dev_warn(&dev->dev, "using bridge %s " 1756 "INT %c to get IRQ %d\n", 1757 pci_name(bridge), 'A' + pin - 1, 1758 irq); 1759 dev = bridge; 1760 } 1761 dev = temp_dev; 1762 if (irq >= 0) { 1763 dev->irq_managed = 1; 1764 dev->irq = irq; 1765 dev_info(&dev->dev, "PCI->APIC IRQ transform: " 1766 "INT %c -> IRQ %d\n", 'A' + pin - 1, irq); 1767 return 0; 1768 } else 1769 msg = "; probably buggy MP table"; 1770 #endif 1771 } else if (pci_probe & PCI_BIOS_IRQ_SCAN) 1772 msg = ""; 1773 else 1774 msg = "; please try using pci=biosirq"; 1775 1776 /* 1777 * With IDE legacy devices the IRQ lookup failure is not 1778 * a problem.. 1779 */ 1780 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && 1781 !(dev->class & 0x5)) 1782 return 0; 1783 1784 dev_warn(&dev->dev, "can't find IRQ for PCI INT %c%s\n", 1785 'A' + pin - 1, msg); 1786 } 1787 return 0; 1788 } 1789 1790 bool mp_should_keep_irq(struct device *dev) 1791 { 1792 if (dev->power.is_prepared) 1793 return true; 1794 #ifdef CONFIG_PM 1795 if (dev->power.runtime_status == RPM_SUSPENDING) 1796 return true; 1797 #endif 1798 1799 return false; 1800 } 1801 1802 static void pirq_disable_irq(struct pci_dev *dev) 1803 { 1804 if (io_apic_assign_pci_irqs && !mp_should_keep_irq(&dev->dev) && 1805 dev->irq_managed && dev->irq) { 1806 mp_unmap_irq(dev->irq); 1807 dev->irq = 0; 1808 dev->irq_managed = 0; 1809 } 1810 } 1811