2 * Low-Level PCI Support for PC -- Routing of Interrupts
4 * (c) 1999--2000 Martin Mares <mj@ucw.cz>
7 #include <linux/types.h>
8 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/slab.h>
12 #include <linux/interrupt.h>
13 #include <linux/dmi.h>
15 #include <linux/smp.h>
16 #include <asm/io_apic.h>
17 #include <linux/irq.h>
18 #include <linux/acpi.h>
19 #include <asm/pci_x86.h>
21 #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
22 #define PIRQ_VERSION 0x0100
24 static int broken_hp_bios_irq9;
25 static int acer_tm360_irqrouting;
27 static struct irq_routing_table *pirq_table;
29 static int pirq_enable_irq(struct pci_dev *dev);
32 * Never use: 0, 1, 2 (timer, keyboard, and cascade)
33 * Avoid using: 13, 14 and 15 (FP error and IDE).
34 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
36 unsigned int pcibios_irq_mask = 0xfff8;
38 static int pirq_penalty[16] = {
39 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
40 0, 0, 0, 0, 1000, 100000, 100000, 100000
46 int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
47 int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq,
51 struct irq_router_handler {
53 int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
56 int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
57 void (*pcibios_disable_irq)(struct pci_dev *dev) = NULL;
60 * Check passed address for the PCI IRQ Routing Table signature
61 * and perform checksum verification.
64 static inline struct irq_routing_table *pirq_check_routing_table(u8 *addr)
66 struct irq_routing_table *rt;
70 rt = (struct irq_routing_table *) addr;
71 if (rt->signature != PIRQ_SIGNATURE ||
72 rt->version != PIRQ_VERSION ||
74 rt->size < sizeof(struct irq_routing_table))
77 for (i = 0; i < rt->size; i++)
80 DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n",
90 * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
93 static struct irq_routing_table * __init pirq_find_routing_table(void)
96 struct irq_routing_table *rt;
98 if (pirq_table_addr) {
99 rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
102 printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
104 for (addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
105 rt = pirq_check_routing_table(addr);
113 * If we have a IRQ routing table, use it to search for peer host
114 * bridges. It's a gross hack, but since there are no other known
115 * ways how to get a list of buses, we have to go this way.
118 static void __init pirq_peer_trick(void)
120 struct irq_routing_table *rt = pirq_table;
125 memset(busmap, 0, sizeof(busmap));
126 for (i = 0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
131 DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
132 for (j = 0; j < 4; j++)
133 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
139 for (i = 1; i < 256; i++) {
141 if (!busmap[i] || pci_find_bus(0, i))
143 node = get_mp_bus_to_node(i);
144 if (pci_scan_bus_on_node(i, &pci_root_ops, node))
145 printk(KERN_INFO "PCI: Discovered primary peer "
146 "bus %02x [IRQ]\n", i);
148 pcibios_last_bus = -1;
152 * Code for querying and setting of IRQ routes on various interrupt routers.
155 void eisa_set_level_irq(unsigned int irq)
157 unsigned char mask = 1 << (irq & 7);
158 unsigned int port = 0x4d0 + (irq >> 3);
160 static u16 eisa_irq_mask;
162 if (irq >= 16 || (1 << irq) & eisa_irq_mask)
165 eisa_irq_mask |= (1 << irq);
166 printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq);
169 DBG(KERN_DEBUG " -> edge");
170 outb(val | mask, port);
175 * Common IRQ routing practice: nibbles in config space,
176 * offset by some magic constant.
178 static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
181 unsigned reg = offset + (nr >> 1);
183 pci_read_config_byte(router, reg, &x);
184 return (nr & 1) ? (x >> 4) : (x & 0xf);
187 static void write_config_nybble(struct pci_dev *router, unsigned offset,
188 unsigned nr, unsigned int val)
191 unsigned reg = offset + (nr >> 1);
193 pci_read_config_byte(router, reg, &x);
194 x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
195 pci_write_config_byte(router, reg, x);
199 * ALI pirq entries are damn ugly, and completely undocumented.
200 * This has been figured out from pirq tables, and it's not a pretty
203 static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
205 static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
207 WARN_ON_ONCE(pirq > 16);
208 return irqmap[read_config_nybble(router, 0x48, pirq-1)];
211 static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
213 static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
214 unsigned int val = irqmap[irq];
216 WARN_ON_ONCE(pirq > 16);
218 write_config_nybble(router, 0x48, pirq-1, val);
225 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
226 * just a pointer to the config space.
228 static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
232 pci_read_config_byte(router, pirq, &x);
233 return (x < 16) ? x : 0;
236 static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
238 pci_write_config_byte(router, pirq, irq);
243 * The VIA pirq rules are nibble-based, like ALI,
244 * but without the ugly irq number munging.
245 * However, PIRQD is in the upper instead of lower 4 bits.
247 static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
249 return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
252 static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
254 write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
259 * The VIA pirq rules are nibble-based, like ALI,
260 * but without the ugly irq number munging.
261 * However, for 82C586, nibble map is different .
263 static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
265 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
267 WARN_ON_ONCE(pirq > 5);
268 return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
271 static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
273 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
275 WARN_ON_ONCE(pirq > 5);
276 write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
281 * ITE 8330G pirq rules are nibble-based
282 * FIXME: pirqmap may be { 1, 0, 3, 2 },
283 * 2+3 are both mapped to irq 9 on my system
285 static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
287 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
289 WARN_ON_ONCE(pirq > 4);
290 return read_config_nybble(router, 0x43, pirqmap[pirq-1]);
293 static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
295 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
297 WARN_ON_ONCE(pirq > 4);
298 write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
303 * OPTI: high four bits are nibble pointer..
304 * I wonder what the low bits do?
306 static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
308 return read_config_nybble(router, 0xb8, pirq >> 4);
311 static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
313 write_config_nybble(router, 0xb8, pirq >> 4, irq);
318 * Cyrix: nibble offset 0x5C
319 * 0x5C bits 7:4 is INTB bits 3:0 is INTA
320 * 0x5D bits 7:4 is INTD bits 3:0 is INTC
322 static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
324 return read_config_nybble(router, 0x5C, (pirq-1)^1);
327 static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
329 write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
334 * PIRQ routing for SiS 85C503 router used in several SiS chipsets.
335 * We have to deal with the following issues here:
336 * - vendors have different ideas about the meaning of link values
337 * - some onboard devices (integrated in the chipset) have special
338 * links and are thus routed differently (i.e. not via PCI INTA-INTD)
339 * - different revision of the router have a different layout for
340 * the routing registers, particularly for the onchip devices
342 * For all routing registers the common thing is we have one byte
343 * per routeable link which is defined as:
344 * bit 7 IRQ mapping enabled (0) or disabled (1)
345 * bits [6:4] reserved (sometimes used for onchip devices)
346 * bits [3:0] IRQ to map to
347 * allowed: 3-7, 9-12, 14-15
348 * reserved: 0, 1, 2, 8, 13
350 * The config-space registers located at 0x41/0x42/0x43/0x44 are
351 * always used to route the normal PCI INT A/B/C/D respectively.
352 * Apparently there are systems implementing PCI routing table using
353 * link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
354 * We try our best to handle both link mappings.
356 * Currently (2003-05-21) it appears most SiS chipsets follow the
357 * definition of routing registers from the SiS-5595 southbridge.
358 * According to the SiS 5595 datasheets the revision id's of the
359 * router (ISA-bridge) should be 0x01 or 0xb0.
361 * Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
362 * Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
363 * They seem to work with the current routing code. However there is
364 * some concern because of the two USB-OHCI HCs (original SiS 5595
365 * had only one). YMMV.
367 * Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
370 * bits [6:5] must be written 01
371 * bit 4 channel-select primary (0), secondary (1)
374 * bit 6 OHCI function disabled (0), enabled (1)
376 * 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
378 * 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
380 * We support USBIRQ (in addition to INTA-INTD) and keep the
381 * IDE, ACPI and DAQ routing untouched as set by the BIOS.
383 * Currently the only reported exception is the new SiS 65x chipset
384 * which includes the SiS 69x southbridge. Here we have the 85C503
385 * router revision 0x04 and there are changes in the register layout
386 * mostly related to the different USB HCs with USB 2.0 support.
388 * Onchip routing for router rev-id 0x04 (try-and-error observation)
390 * 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
391 * bit 6-4 are probably unused, not like 5595
394 #define PIRQ_SIS_IRQ_MASK 0x0f
395 #define PIRQ_SIS_IRQ_DISABLE 0x80
396 #define PIRQ_SIS_USB_ENABLE 0x40
398 static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
404 if (reg >= 0x01 && reg <= 0x04)
406 pci_read_config_byte(router, reg, &x);
407 return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
410 static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
416 if (reg >= 0x01 && reg <= 0x04)
418 pci_read_config_byte(router, reg, &x);
419 x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
420 x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
421 pci_write_config_byte(router, reg, x);
427 * VLSI: nibble offset 0x74 - educated guess due to routing table and
428 * config space of VLSI 82C534 PCI-bridge/router (1004:0102)
429 * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
430 * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
431 * for the busbridge to the docking station.
434 static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
436 WARN_ON_ONCE(pirq >= 9);
438 dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
441 return read_config_nybble(router, 0x74, pirq-1);
444 static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
446 WARN_ON_ONCE(pirq >= 9);
448 dev_info(&dev->dev, "VLSI router PIRQ escape (%d)\n", pirq);
451 write_config_nybble(router, 0x74, pirq-1, irq);
456 * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
457 * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
458 * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
459 * register is a straight binary coding of desired PIC IRQ (low nibble).
461 * The 'link' value in the PIRQ table is already in the correct format
462 * for the Index register. There are some special index values:
463 * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
464 * and 0x03 for SMBus.
466 static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
469 return inb(0xc01) & 0xf;
472 static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev,
480 /* Support for AMD756 PCI IRQ Routing
481 * Jhon H. Caicedo <jhcaiced@osso.org.co>
482 * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
483 * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
484 * The AMD756 pirq rules are nibble-based
485 * offset 0x56 0-3 PIRQA 4-7 PIRQB
486 * offset 0x57 0-3 PIRQC 4-7 PIRQD
488 static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
493 irq = read_config_nybble(router, 0x56, pirq - 1);
495 "AMD756: dev [%04x:%04x], router PIRQ %d get IRQ %d\n",
496 dev->vendor, dev->device, pirq, irq);
500 static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
503 "AMD756: dev [%04x:%04x], router PIRQ %d set IRQ %d\n",
504 dev->vendor, dev->device, pirq, irq);
506 write_config_nybble(router, 0x56, pirq - 1, irq);
513 static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
515 outb(0x10 + ((pirq - 1) >> 1), 0x24);
516 return ((pirq - 1) & 1) ? (inb(0x26) >> 4) : (inb(0x26) & 0xf);
519 static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
523 outb(0x10 + ((pirq - 1) >> 1), 0x24);
525 x = ((pirq - 1) & 1) ? ((x & 0x0f) | (irq << 4)) : ((x & 0xf0) | (irq));
530 #ifdef CONFIG_PCI_BIOS
532 static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
534 struct pci_dev *bridge;
535 int pin = pci_get_interrupt_pin(dev, &bridge);
536 return pcibios_set_irq_routing(bridge, pin - 1, irq);
541 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
543 static struct pci_device_id __initdata pirq_440gx[] = {
544 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
545 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
549 /* 440GX has a proprietary PIRQ router -- don't use it */
550 if (pci_dev_present(pirq_440gx))
554 case PCI_DEVICE_ID_INTEL_82371FB_0:
555 case PCI_DEVICE_ID_INTEL_82371SB_0:
556 case PCI_DEVICE_ID_INTEL_82371AB_0:
557 case PCI_DEVICE_ID_INTEL_82371MX:
558 case PCI_DEVICE_ID_INTEL_82443MX_0:
559 case PCI_DEVICE_ID_INTEL_82801AA_0:
560 case PCI_DEVICE_ID_INTEL_82801AB_0:
561 case PCI_DEVICE_ID_INTEL_82801BA_0:
562 case PCI_DEVICE_ID_INTEL_82801BA_10:
563 case PCI_DEVICE_ID_INTEL_82801CA_0:
564 case PCI_DEVICE_ID_INTEL_82801CA_12:
565 case PCI_DEVICE_ID_INTEL_82801DB_0:
566 case PCI_DEVICE_ID_INTEL_82801E_0:
567 case PCI_DEVICE_ID_INTEL_82801EB_0:
568 case PCI_DEVICE_ID_INTEL_ESB_1:
569 case PCI_DEVICE_ID_INTEL_ICH6_0:
570 case PCI_DEVICE_ID_INTEL_ICH6_1:
571 case PCI_DEVICE_ID_INTEL_ICH7_0:
572 case PCI_DEVICE_ID_INTEL_ICH7_1:
573 case PCI_DEVICE_ID_INTEL_ICH7_30:
574 case PCI_DEVICE_ID_INTEL_ICH7_31:
575 case PCI_DEVICE_ID_INTEL_TGP_LPC:
576 case PCI_DEVICE_ID_INTEL_ESB2_0:
577 case PCI_DEVICE_ID_INTEL_ICH8_0:
578 case PCI_DEVICE_ID_INTEL_ICH8_1:
579 case PCI_DEVICE_ID_INTEL_ICH8_2:
580 case PCI_DEVICE_ID_INTEL_ICH8_3:
581 case PCI_DEVICE_ID_INTEL_ICH8_4:
582 case PCI_DEVICE_ID_INTEL_ICH9_0:
583 case PCI_DEVICE_ID_INTEL_ICH9_1:
584 case PCI_DEVICE_ID_INTEL_ICH9_2:
585 case PCI_DEVICE_ID_INTEL_ICH9_3:
586 case PCI_DEVICE_ID_INTEL_ICH9_4:
587 case PCI_DEVICE_ID_INTEL_ICH9_5:
588 case PCI_DEVICE_ID_INTEL_TOLAPAI_0:
589 case PCI_DEVICE_ID_INTEL_ICH10_0:
590 case PCI_DEVICE_ID_INTEL_ICH10_1:
591 case PCI_DEVICE_ID_INTEL_ICH10_2:
592 case PCI_DEVICE_ID_INTEL_ICH10_3:
593 r->name = "PIIX/ICH";
594 r->get = pirq_piix_get;
595 r->set = pirq_piix_set;
599 if ((device >= PCI_DEVICE_ID_INTEL_PCH_LPC_MIN) &&
600 (device <= PCI_DEVICE_ID_INTEL_PCH_LPC_MAX)) {
601 r->name = "PIIX/ICH";
602 r->get = pirq_piix_get;
603 r->set = pirq_piix_set;
610 static __init int via_router_probe(struct irq_router *r,
611 struct pci_dev *router, u16 device)
613 /* FIXME: We should move some of the quirk fixup stuff here */
616 * workarounds for some buggy BIOSes
618 if (device == PCI_DEVICE_ID_VIA_82C586_0) {
619 switch (router->device) {
620 case PCI_DEVICE_ID_VIA_82C686:
622 * Asus k7m bios wrongly reports 82C686A
625 device = PCI_DEVICE_ID_VIA_82C686;
627 case PCI_DEVICE_ID_VIA_8235:
629 * Asus a7v-x bios wrongly reports 8235
632 device = PCI_DEVICE_ID_VIA_8235;
634 case PCI_DEVICE_ID_VIA_8237:
636 * Asus a7v600 bios wrongly reports 8237
639 device = PCI_DEVICE_ID_VIA_8237;
645 case PCI_DEVICE_ID_VIA_82C586_0:
647 r->get = pirq_via586_get;
648 r->set = pirq_via586_set;
650 case PCI_DEVICE_ID_VIA_82C596:
651 case PCI_DEVICE_ID_VIA_82C686:
652 case PCI_DEVICE_ID_VIA_8231:
653 case PCI_DEVICE_ID_VIA_8233A:
654 case PCI_DEVICE_ID_VIA_8235:
655 case PCI_DEVICE_ID_VIA_8237:
656 /* FIXME: add new ones for 8233/5 */
658 r->get = pirq_via_get;
659 r->set = pirq_via_set;
665 static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
668 case PCI_DEVICE_ID_VLSI_82C534:
669 r->name = "VLSI 82C534";
670 r->get = pirq_vlsi_get;
671 r->set = pirq_vlsi_set;
678 static __init int serverworks_router_probe(struct irq_router *r,
679 struct pci_dev *router, u16 device)
682 case PCI_DEVICE_ID_SERVERWORKS_OSB4:
683 case PCI_DEVICE_ID_SERVERWORKS_CSB5:
684 r->name = "ServerWorks";
685 r->get = pirq_serverworks_get;
686 r->set = pirq_serverworks_set;
692 static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
694 if (device != PCI_DEVICE_ID_SI_503)
698 r->get = pirq_sis_get;
699 r->set = pirq_sis_set;
703 static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
706 case PCI_DEVICE_ID_CYRIX_5520:
708 r->get = pirq_cyrix_get;
709 r->set = pirq_cyrix_set;
715 static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
718 case PCI_DEVICE_ID_OPTI_82C700:
720 r->get = pirq_opti_get;
721 r->set = pirq_opti_set;
727 static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
730 case PCI_DEVICE_ID_ITE_IT8330G_0:
732 r->get = pirq_ite_get;
733 r->set = pirq_ite_set;
739 static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
742 case PCI_DEVICE_ID_AL_M1533:
743 case PCI_DEVICE_ID_AL_M1563:
745 r->get = pirq_ali_get;
746 r->set = pirq_ali_set;
752 static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
755 case PCI_DEVICE_ID_AMD_VIPER_740B:
758 case PCI_DEVICE_ID_AMD_VIPER_7413:
761 case PCI_DEVICE_ID_AMD_VIPER_7443:
767 r->get = pirq_amd756_get;
768 r->set = pirq_amd756_set;
772 static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
775 case PCI_DEVICE_ID_PICOPOWER_PT86C523:
776 r->name = "PicoPower PT86C523";
777 r->get = pirq_pico_get;
778 r->set = pirq_pico_set;
781 case PCI_DEVICE_ID_PICOPOWER_PT86C523BBP:
782 r->name = "PicoPower PT86C523 rev. BB+";
783 r->get = pirq_pico_get;
784 r->set = pirq_pico_set;
790 static __initdata struct irq_router_handler pirq_routers[] = {
791 { PCI_VENDOR_ID_INTEL, intel_router_probe },
792 { PCI_VENDOR_ID_AL, ali_router_probe },
793 { PCI_VENDOR_ID_ITE, ite_router_probe },
794 { PCI_VENDOR_ID_VIA, via_router_probe },
795 { PCI_VENDOR_ID_OPTI, opti_router_probe },
796 { PCI_VENDOR_ID_SI, sis_router_probe },
797 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
798 { PCI_VENDOR_ID_VLSI, vlsi_router_probe },
799 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
800 { PCI_VENDOR_ID_AMD, amd_router_probe },
801 { PCI_VENDOR_ID_PICOPOWER, pico_router_probe },
802 /* Someone with docs needs to add the ATI Radeon IGP */
805 static struct irq_router pirq_router;
806 static struct pci_dev *pirq_router_dev;
810 * FIXME: should we have an option to say "generic for
814 static void __init pirq_find_router(struct irq_router *r)
816 struct irq_routing_table *rt = pirq_table;
817 struct irq_router_handler *h;
819 #ifdef CONFIG_PCI_BIOS
820 if (!rt->signature) {
821 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
822 r->set = pirq_bios_set;
828 /* Default unless a driver reloads it */
833 DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for [%04x:%04x]\n",
834 rt->rtr_vendor, rt->rtr_device);
836 pirq_router_dev = pci_get_bus_and_slot(rt->rtr_bus, rt->rtr_devfn);
837 if (!pirq_router_dev) {
838 DBG(KERN_DEBUG "PCI: Interrupt router not found at "
839 "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
843 for (h = pirq_routers; h->vendor; h++) {
844 /* First look for a router match */
845 if (rt->rtr_vendor == h->vendor &&
846 h->probe(r, pirq_router_dev, rt->rtr_device))
848 /* Fall back to a device match */
849 if (pirq_router_dev->vendor == h->vendor &&
850 h->probe(r, pirq_router_dev, pirq_router_dev->device))
853 dev_info(&pirq_router_dev->dev, "%s IRQ router [%04x:%04x]\n",
855 pirq_router_dev->vendor, pirq_router_dev->device);
857 /* The device remains referenced for the kernel lifetime */
860 static struct irq_info *pirq_get_info(struct pci_dev *dev)
862 struct irq_routing_table *rt = pirq_table;
863 int entries = (rt->size - sizeof(struct irq_routing_table)) /
864 sizeof(struct irq_info);
865 struct irq_info *info;
867 for (info = rt->slots; entries--; info++)
868 if (info->bus == dev->bus->number &&
869 PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
874 static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
877 struct irq_info *info;
881 struct irq_router *r = &pirq_router;
882 struct pci_dev *dev2 = NULL;
886 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
888 dev_dbg(&dev->dev, "no interrupt pin\n");
892 /* Find IRQ routing entry */
897 info = pirq_get_info(dev);
899 dev_dbg(&dev->dev, "PCI INT %c not found in routing table\n",
903 pirq = info->irq[pin - 1].link;
904 mask = info->irq[pin - 1].bitmap;
906 dev_dbg(&dev->dev, "PCI INT %c not routed\n", 'A' + pin - 1);
909 dev_dbg(&dev->dev, "PCI INT %c -> PIRQ %02x, mask %04x, excl %04x",
910 'A' + pin - 1, pirq, mask, pirq_table->exclusive_irqs);
911 mask &= pcibios_irq_mask;
913 /* Work around broken HP Pavilion Notebooks which assign USB to
914 IRQ 9 even though it is actually wired to IRQ 11 */
916 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
918 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
919 r->set(pirq_router_dev, dev, pirq, 11);
922 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
923 if (acer_tm360_irqrouting && dev->irq == 11 &&
924 dev->vendor == PCI_VENDOR_ID_O2) {
927 dev->irq = r->get(pirq_router_dev, dev, pirq);
928 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
932 * Find the best IRQ to assign: use the one
933 * reported by the device if possible.
936 if (newirq && !((1 << newirq) & mask)) {
937 if (pci_probe & PCI_USE_PIRQ_MASK)
940 dev_warn(&dev->dev, "IRQ %d doesn't match PIRQ mask "
941 "%#x; try pci=usepirqmask\n", newirq, mask);
943 if (!newirq && assign) {
944 for (i = 0; i < 16; i++) {
945 if (!(mask & (1 << i)))
947 if (pirq_penalty[i] < pirq_penalty[newirq] &&
948 can_request_irq(i, IRQF_SHARED))
952 dev_dbg(&dev->dev, "PCI INT %c -> newirq %d", 'A' + pin - 1, newirq);
954 /* Check if it is hardcoded */
955 if ((pirq & 0xf0) == 0xf0) {
958 } else if (r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
959 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask))) {
961 eisa_set_level_irq(irq);
962 } else if (newirq && r->set &&
963 (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
964 if (r->set(pirq_router_dev, dev, pirq, newirq)) {
965 eisa_set_level_irq(newirq);
972 if (newirq && mask == (1 << newirq)) {
976 dev_dbg(&dev->dev, "can't route interrupt\n");
980 dev_info(&dev->dev, "%s PCI INT %c -> IRQ %d\n", msg, 'A' + pin - 1, irq);
982 /* Update IRQ for all devices with the same pirq value */
983 while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
984 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
988 info = pirq_get_info(dev2);
991 if (info->irq[pin - 1].link == pirq) {
993 * We refuse to override the dev->irq
994 * information. Give a warning!
996 if (dev2->irq && dev2->irq != irq && \
997 (!(pci_probe & PCI_USE_PIRQ_MASK) || \
998 ((1 << dev2->irq) & mask))) {
999 #ifndef CONFIG_PCI_MSI
1000 dev_info(&dev2->dev, "IRQ routing conflict: "
1001 "have IRQ %d, want IRQ %d\n",
1007 pirq_penalty[irq]++;
1009 dev_info(&dev->dev, "sharing IRQ %d with %s\n",
1010 irq, pci_name(dev2));
1016 static void __init pcibios_fixup_irqs(void)
1018 struct pci_dev *dev = NULL;
1021 DBG(KERN_DEBUG "PCI: IRQ fixup\n");
1022 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1024 * If the BIOS has set an out of range IRQ number, just
1025 * ignore it. Also keep track of which IRQ's are
1028 if (dev->irq >= 16) {
1029 dev_dbg(&dev->dev, "ignoring bogus IRQ %d\n", dev->irq);
1033 * If the IRQ is already assigned to a PCI device,
1034 * ignore its ISA use penalty
1036 if (pirq_penalty[dev->irq] >= 100 &&
1037 pirq_penalty[dev->irq] < 100000)
1038 pirq_penalty[dev->irq] = 0;
1039 pirq_penalty[dev->irq]++;
1043 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1044 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1048 #ifdef CONFIG_X86_IO_APIC
1050 * Recalculate IRQ numbers if we use the I/O APIC.
1052 if (io_apic_assign_pci_irqs) {
1056 * interrupt pins are numbered starting from 1
1058 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
1059 PCI_SLOT(dev->devfn), pin - 1);
1061 * Busses behind bridges are typically not listed in the
1062 * MP-table. In this case we have to look up the IRQ
1063 * based on the parent bus, parent slot, and pin number.
1064 * The SMP code detects such bridged busses itself so we
1065 * should get into this branch reliably.
1067 if (irq < 0 && dev->bus->parent) {
1068 /* go back to the bridge */
1069 struct pci_dev *bridge = dev->bus->self;
1072 pin = pci_swizzle_interrupt_pin(dev, pin);
1073 bus = bridge->bus->number;
1074 irq = IO_APIC_get_PCI_irq_vector(bus,
1075 PCI_SLOT(bridge->devfn), pin - 1);
1078 "using bridge %s INT %c to "
1081 'A' + pin - 1, irq);
1085 "PCI->APIC IRQ transform: INT %c "
1087 'A' + pin - 1, irq);
1093 * Still no IRQ? Try to lookup one...
1096 pcibios_lookup_irq(dev, 0);
1101 * Work around broken HP Pavilion Notebooks which assign USB to
1102 * IRQ 9 even though it is actually wired to IRQ 11
1104 static int __init fix_broken_hp_bios_irq9(const struct dmi_system_id *d)
1106 if (!broken_hp_bios_irq9) {
1107 broken_hp_bios_irq9 = 1;
1108 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
1115 * Work around broken Acer TravelMate 360 Notebooks which assign
1116 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
1118 static int __init fix_acer_tm360_irqrouting(const struct dmi_system_id *d)
1120 if (!acer_tm360_irqrouting) {
1121 acer_tm360_irqrouting = 1;
1122 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
1128 static struct dmi_system_id __initdata pciirq_dmi_table[] = {
1130 .callback = fix_broken_hp_bios_irq9,
1131 .ident = "HP Pavilion N5400 Series Laptop",
1133 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1134 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
1135 DMI_MATCH(DMI_PRODUCT_VERSION,
1136 "HP Pavilion Notebook Model GE"),
1137 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
1141 .callback = fix_acer_tm360_irqrouting,
1142 .ident = "Acer TravelMate 36x Laptop",
1144 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1145 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1151 int __init pcibios_irq_init(void)
1153 DBG(KERN_DEBUG "PCI: IRQ init\n");
1155 if (pcibios_enable_irq || raw_pci_ops == NULL)
1158 dmi_check_system(pciirq_dmi_table);
1160 pirq_table = pirq_find_routing_table();
1162 #ifdef CONFIG_PCI_BIOS
1163 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
1164 pirq_table = pcibios_get_irq_routing_table();
1168 pirq_find_router(&pirq_router);
1169 if (pirq_table->exclusive_irqs) {
1171 for (i = 0; i < 16; i++)
1172 if (!(pirq_table->exclusive_irqs & (1 << i)))
1173 pirq_penalty[i] += 100;
1176 * If we're using the I/O APIC, avoid using the PCI IRQ
1179 if (io_apic_assign_pci_irqs)
1183 pcibios_enable_irq = pirq_enable_irq;
1185 pcibios_fixup_irqs();
1189 static void pirq_penalize_isa_irq(int irq, int active)
1192 * If any ISAPnP device reports an IRQ in its list of possible
1193 * IRQ's, we try to avoid assigning it to PCI devices.
1197 pirq_penalty[irq] += 1000;
1199 pirq_penalty[irq] += 100;
1203 void pcibios_penalize_isa_irq(int irq, int active)
1207 acpi_penalize_isa_irq(irq, active);
1210 pirq_penalize_isa_irq(irq, active);
1213 static int pirq_enable_irq(struct pci_dev *dev)
1216 struct pci_dev *temp_dev;
1218 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1219 if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
1222 if (io_apic_assign_pci_irqs) {
1225 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin - 1);
1227 * Busses behind bridges are typically not listed in the MP-table.
1228 * In this case we have to look up the IRQ based on the parent bus,
1229 * parent slot, and pin number. The SMP code detects such bridged
1230 * busses itself so we should get into this branch reliably.
1233 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1234 struct pci_dev *bridge = dev->bus->self;
1236 pin = pci_swizzle_interrupt_pin(dev, pin);
1237 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1238 PCI_SLOT(bridge->devfn), pin - 1);
1240 dev_warn(&dev->dev, "using bridge %s "
1241 "INT %c to get IRQ %d\n",
1242 pci_name(bridge), 'A' + pin - 1,
1248 dev_info(&dev->dev, "PCI->APIC IRQ transform: "
1249 "INT %c -> IRQ %d\n", 'A' + pin - 1, irq);
1253 msg = "; probably buggy MP table";
1254 } else if (pci_probe & PCI_BIOS_IRQ_SCAN)
1257 msg = "; please try using pci=biosirq";
1260 * With IDE legacy devices the IRQ lookup failure is not
1263 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
1264 !(dev->class & 0x5))
1267 dev_warn(&dev->dev, "can't find IRQ for PCI INT %c%s\n",
1268 'A' + pin - 1, msg);