2 * Low-Level PCI Support for PC -- Routing of Interrupts
4 * (c) 1999--2000 Martin Mares <mj@ucw.cz>
7 #include <linux/config.h>
8 #include <linux/types.h>
9 #include <linux/kernel.h>
10 #include <linux/pci.h>
11 #include <linux/init.h>
12 #include <linux/slab.h>
13 #include <linux/interrupt.h>
14 #include <linux/dmi.h>
17 #include <asm/io_apic.h>
18 #include <linux/irq.h>
19 #include <linux/acpi.h>
23 #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
24 #define PIRQ_VERSION 0x0100
26 static int broken_hp_bios_irq9;
27 static int acer_tm360_irqrouting;
29 static struct irq_routing_table *pirq_table;
31 static int pirq_enable_irq(struct pci_dev *dev);
34 * Never use: 0, 1, 2 (timer, keyboard, and cascade)
35 * Avoid using: 13, 14 and 15 (FP error and IDE).
36 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
38 unsigned int pcibios_irq_mask = 0xfff8;
40 static int pirq_penalty[16] = {
41 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
42 0, 0, 0, 0, 1000, 100000, 100000, 100000
48 int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
49 int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
52 struct irq_router_handler {
54 int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
57 int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
58 void (*pcibios_disable_irq)(struct pci_dev *dev) = NULL;
61 * Check passed address for the PCI IRQ Routing Table signature
62 * and perform checksum verification.
65 static inline struct irq_routing_table * pirq_check_routing_table(u8 *addr)
67 struct irq_routing_table *rt;
71 rt = (struct irq_routing_table *) addr;
72 if (rt->signature != PIRQ_SIGNATURE ||
73 rt->version != PIRQ_VERSION ||
75 rt->size < sizeof(struct irq_routing_table))
78 for (i=0; i < rt->size; i++)
81 DBG(KERN_DEBUG "PCI: Interrupt Routing Table found at 0x%p\n", rt);
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);
133 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
139 for(i = 1; i < 256; i++) {
140 if (!busmap[i] || pci_find_bus(0, i))
142 if (pci_scan_bus(i, &pci_root_ops, NULL))
143 printk(KERN_INFO "PCI: Discovered primary peer bus %02x [IRQ]\n", i);
145 pcibios_last_bus = -1;
149 * Code for querying and setting of IRQ routes on various interrupt routers.
152 void eisa_set_level_irq(unsigned int irq)
154 unsigned char mask = 1 << (irq & 7);
155 unsigned int port = 0x4d0 + (irq >> 3);
157 static u16 eisa_irq_mask;
159 if (irq >= 16 || (1 << irq) & eisa_irq_mask)
162 eisa_irq_mask |= (1 << irq);
163 printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq);
166 DBG(KERN_DEBUG " -> edge");
167 outb(val | mask, port);
172 * Common IRQ routing practice: nybbles in config space,
173 * offset by some magic constant.
175 static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
178 unsigned reg = offset + (nr >> 1);
180 pci_read_config_byte(router, reg, &x);
181 return (nr & 1) ? (x >> 4) : (x & 0xf);
184 static void write_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr, unsigned int val)
187 unsigned reg = offset + (nr >> 1);
189 pci_read_config_byte(router, reg, &x);
190 x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
191 pci_write_config_byte(router, reg, x);
195 * ALI pirq entries are damn ugly, and completely undocumented.
196 * This has been figured out from pirq tables, and it's not a pretty
199 static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
201 static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
203 return irqmap[read_config_nybble(router, 0x48, pirq-1)];
206 static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
208 static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
209 unsigned int val = irqmap[irq];
212 write_config_nybble(router, 0x48, pirq-1, val);
219 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
220 * just a pointer to the config space.
222 static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
226 pci_read_config_byte(router, pirq, &x);
227 return (x < 16) ? x : 0;
230 static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
232 pci_write_config_byte(router, pirq, irq);
237 * The VIA pirq rules are nibble-based, like ALI,
238 * but without the ugly irq number munging.
239 * However, PIRQD is in the upper instead of lower 4 bits.
241 static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
243 return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
246 static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
248 write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
253 * The VIA pirq rules are nibble-based, like ALI,
254 * but without the ugly irq number munging.
255 * However, for 82C586, nibble map is different .
257 static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
259 static const unsigned int pirqmap[4] = { 3, 2, 5, 1 };
260 return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
263 static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
265 static const unsigned int pirqmap[4] = { 3, 2, 5, 1 };
266 write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
271 * ITE 8330G pirq rules are nibble-based
272 * FIXME: pirqmap may be { 1, 0, 3, 2 },
273 * 2+3 are both mapped to irq 9 on my system
275 static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
277 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
278 return read_config_nybble(router,0x43, pirqmap[pirq-1]);
281 static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
283 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
284 write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
289 * OPTI: high four bits are nibble pointer..
290 * I wonder what the low bits do?
292 static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
294 return read_config_nybble(router, 0xb8, pirq >> 4);
297 static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
299 write_config_nybble(router, 0xb8, pirq >> 4, irq);
304 * Cyrix: nibble offset 0x5C
305 * 0x5C bits 7:4 is INTB bits 3:0 is INTA
306 * 0x5D bits 7:4 is INTD bits 3:0 is INTC
308 static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
310 return read_config_nybble(router, 0x5C, (pirq-1)^1);
313 static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
315 write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
320 * PIRQ routing for SiS 85C503 router used in several SiS chipsets.
321 * We have to deal with the following issues here:
322 * - vendors have different ideas about the meaning of link values
323 * - some onboard devices (integrated in the chipset) have special
324 * links and are thus routed differently (i.e. not via PCI INTA-INTD)
325 * - different revision of the router have a different layout for
326 * the routing registers, particularly for the onchip devices
328 * For all routing registers the common thing is we have one byte
329 * per routeable link which is defined as:
330 * bit 7 IRQ mapping enabled (0) or disabled (1)
331 * bits [6:4] reserved (sometimes used for onchip devices)
332 * bits [3:0] IRQ to map to
333 * allowed: 3-7, 9-12, 14-15
334 * reserved: 0, 1, 2, 8, 13
336 * The config-space registers located at 0x41/0x42/0x43/0x44 are
337 * always used to route the normal PCI INT A/B/C/D respectively.
338 * Apparently there are systems implementing PCI routing table using
339 * link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
340 * We try our best to handle both link mappings.
342 * Currently (2003-05-21) it appears most SiS chipsets follow the
343 * definition of routing registers from the SiS-5595 southbridge.
344 * According to the SiS 5595 datasheets the revision id's of the
345 * router (ISA-bridge) should be 0x01 or 0xb0.
347 * Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
348 * Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
349 * They seem to work with the current routing code. However there is
350 * some concern because of the two USB-OHCI HCs (original SiS 5595
351 * had only one). YMMV.
353 * Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
356 * bits [6:5] must be written 01
357 * bit 4 channel-select primary (0), secondary (1)
360 * bit 6 OHCI function disabled (0), enabled (1)
362 * 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
364 * 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
366 * We support USBIRQ (in addition to INTA-INTD) and keep the
367 * IDE, ACPI and DAQ routing untouched as set by the BIOS.
369 * Currently the only reported exception is the new SiS 65x chipset
370 * which includes the SiS 69x southbridge. Here we have the 85C503
371 * router revision 0x04 and there are changes in the register layout
372 * mostly related to the different USB HCs with USB 2.0 support.
374 * Onchip routing for router rev-id 0x04 (try-and-error observation)
376 * 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
377 * bit 6-4 are probably unused, not like 5595
380 #define PIRQ_SIS_IRQ_MASK 0x0f
381 #define PIRQ_SIS_IRQ_DISABLE 0x80
382 #define PIRQ_SIS_USB_ENABLE 0x40
384 static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
390 if (reg >= 0x01 && reg <= 0x04)
392 pci_read_config_byte(router, reg, &x);
393 return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
396 static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
402 if (reg >= 0x01 && reg <= 0x04)
404 pci_read_config_byte(router, reg, &x);
405 x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
406 x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
407 pci_write_config_byte(router, reg, x);
413 * VLSI: nibble offset 0x74 - educated guess due to routing table and
414 * config space of VLSI 82C534 PCI-bridge/router (1004:0102)
415 * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
416 * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
417 * for the busbridge to the docking station.
420 static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
423 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
426 return read_config_nybble(router, 0x74, pirq-1);
429 static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
432 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
435 write_config_nybble(router, 0x74, pirq-1, irq);
440 * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
441 * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
442 * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
443 * register is a straight binary coding of desired PIC IRQ (low nibble).
445 * The 'link' value in the PIRQ table is already in the correct format
446 * for the Index register. There are some special index values:
447 * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
448 * and 0x03 for SMBus.
450 static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
453 return inb(0xc01) & 0xf;
456 static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
463 /* Support for AMD756 PCI IRQ Routing
464 * Jhon H. Caicedo <jhcaiced@osso.org.co>
465 * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
466 * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
467 * The AMD756 pirq rules are nibble-based
468 * offset 0x56 0-3 PIRQA 4-7 PIRQB
469 * offset 0x57 0-3 PIRQC 4-7 PIRQD
471 static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
477 irq = read_config_nybble(router, 0x56, pirq - 1);
479 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d get irq : %2d\n",
480 dev->vendor, dev->device, pirq, irq);
484 static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
486 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d SET irq : %2d\n",
487 dev->vendor, dev->device, pirq, irq);
490 write_config_nybble(router, 0x56, pirq - 1, irq);
495 #ifdef CONFIG_PCI_BIOS
497 static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
499 struct pci_dev *bridge;
500 int pin = pci_get_interrupt_pin(dev, &bridge);
501 return pcibios_set_irq_routing(bridge, pin, irq);
506 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
508 static struct pci_device_id __initdata pirq_440gx[] = {
509 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
510 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
514 /* 440GX has a proprietary PIRQ router -- don't use it */
515 if (pci_dev_present(pirq_440gx))
520 case PCI_DEVICE_ID_INTEL_82371FB_0:
521 case PCI_DEVICE_ID_INTEL_82371SB_0:
522 case PCI_DEVICE_ID_INTEL_82371AB_0:
523 case PCI_DEVICE_ID_INTEL_82371MX:
524 case PCI_DEVICE_ID_INTEL_82443MX_0:
525 case PCI_DEVICE_ID_INTEL_82801AA_0:
526 case PCI_DEVICE_ID_INTEL_82801AB_0:
527 case PCI_DEVICE_ID_INTEL_82801BA_0:
528 case PCI_DEVICE_ID_INTEL_82801BA_10:
529 case PCI_DEVICE_ID_INTEL_82801CA_0:
530 case PCI_DEVICE_ID_INTEL_82801CA_12:
531 case PCI_DEVICE_ID_INTEL_82801DB_0:
532 case PCI_DEVICE_ID_INTEL_82801E_0:
533 case PCI_DEVICE_ID_INTEL_82801EB_0:
534 case PCI_DEVICE_ID_INTEL_ESB_1:
535 case PCI_DEVICE_ID_INTEL_ICH6_0:
536 case PCI_DEVICE_ID_INTEL_ICH6_1:
537 case PCI_DEVICE_ID_INTEL_ICH7_0:
538 case PCI_DEVICE_ID_INTEL_ICH7_1:
539 case PCI_DEVICE_ID_INTEL_ICH7_30:
540 case PCI_DEVICE_ID_INTEL_ICH7_31:
541 case PCI_DEVICE_ID_INTEL_ESB2_0:
542 case PCI_DEVICE_ID_INTEL_ICH8_0:
543 case PCI_DEVICE_ID_INTEL_ICH8_1:
544 case PCI_DEVICE_ID_INTEL_ICH8_2:
545 case PCI_DEVICE_ID_INTEL_ICH8_3:
546 case PCI_DEVICE_ID_INTEL_ICH8_4:
547 r->name = "PIIX/ICH";
548 r->get = pirq_piix_get;
549 r->set = pirq_piix_set;
555 static __init int via_router_probe(struct irq_router *r,
556 struct pci_dev *router, u16 device)
558 /* FIXME: We should move some of the quirk fixup stuff here */
561 * work arounds for some buggy BIOSes
563 if (device == PCI_DEVICE_ID_VIA_82C586_0) {
564 switch(router->device) {
565 case PCI_DEVICE_ID_VIA_82C686:
567 * Asus k7m bios wrongly reports 82C686A
570 device = PCI_DEVICE_ID_VIA_82C686;
572 case PCI_DEVICE_ID_VIA_8235:
574 * Asus a7v-x bios wrongly reports 8235
577 device = PCI_DEVICE_ID_VIA_8235;
583 case PCI_DEVICE_ID_VIA_82C586_0:
585 r->get = pirq_via586_get;
586 r->set = pirq_via586_set;
588 case PCI_DEVICE_ID_VIA_82C596:
589 case PCI_DEVICE_ID_VIA_82C686:
590 case PCI_DEVICE_ID_VIA_8231:
591 case PCI_DEVICE_ID_VIA_8233A:
592 case PCI_DEVICE_ID_VIA_8235:
593 case PCI_DEVICE_ID_VIA_8237:
594 /* FIXME: add new ones for 8233/5 */
596 r->get = pirq_via_get;
597 r->set = pirq_via_set;
603 static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
607 case PCI_DEVICE_ID_VLSI_82C534:
608 r->name = "VLSI 82C534";
609 r->get = pirq_vlsi_get;
610 r->set = pirq_vlsi_set;
617 static __init int serverworks_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
621 case PCI_DEVICE_ID_SERVERWORKS_OSB4:
622 case PCI_DEVICE_ID_SERVERWORKS_CSB5:
623 r->name = "ServerWorks";
624 r->get = pirq_serverworks_get;
625 r->set = pirq_serverworks_set;
631 static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
633 if (device != PCI_DEVICE_ID_SI_503)
637 r->get = pirq_sis_get;
638 r->set = pirq_sis_set;
642 static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
646 case PCI_DEVICE_ID_CYRIX_5520:
648 r->get = pirq_cyrix_get;
649 r->set = pirq_cyrix_set;
655 static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
659 case PCI_DEVICE_ID_OPTI_82C700:
661 r->get = pirq_opti_get;
662 r->set = pirq_opti_set;
668 static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
672 case PCI_DEVICE_ID_ITE_IT8330G_0:
674 r->get = pirq_ite_get;
675 r->set = pirq_ite_set;
681 static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
685 case PCI_DEVICE_ID_AL_M1533:
686 case PCI_DEVICE_ID_AL_M1563:
687 printk(KERN_DEBUG "PCI: Using ALI IRQ Router\n");
689 r->get = pirq_ali_get;
690 r->set = pirq_ali_set;
696 static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
700 case PCI_DEVICE_ID_AMD_VIPER_740B:
703 case PCI_DEVICE_ID_AMD_VIPER_7413:
706 case PCI_DEVICE_ID_AMD_VIPER_7443:
712 r->get = pirq_amd756_get;
713 r->set = pirq_amd756_set;
717 static __initdata struct irq_router_handler pirq_routers[] = {
718 { PCI_VENDOR_ID_INTEL, intel_router_probe },
719 { PCI_VENDOR_ID_AL, ali_router_probe },
720 { PCI_VENDOR_ID_ITE, ite_router_probe },
721 { PCI_VENDOR_ID_VIA, via_router_probe },
722 { PCI_VENDOR_ID_OPTI, opti_router_probe },
723 { PCI_VENDOR_ID_SI, sis_router_probe },
724 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
725 { PCI_VENDOR_ID_VLSI, vlsi_router_probe },
726 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
727 { PCI_VENDOR_ID_AMD, amd_router_probe },
728 /* Someone with docs needs to add the ATI Radeon IGP */
731 static struct irq_router pirq_router;
732 static struct pci_dev *pirq_router_dev;
736 * FIXME: should we have an option to say "generic for
740 static void __init pirq_find_router(struct irq_router *r)
742 struct irq_routing_table *rt = pirq_table;
743 struct irq_router_handler *h;
745 #ifdef CONFIG_PCI_BIOS
746 if (!rt->signature) {
747 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
748 r->set = pirq_bios_set;
754 /* Default unless a driver reloads it */
759 DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for %04x:%04x\n",
760 rt->rtr_vendor, rt->rtr_device);
762 pirq_router_dev = pci_find_slot(rt->rtr_bus, rt->rtr_devfn);
763 if (!pirq_router_dev) {
764 DBG(KERN_DEBUG "PCI: Interrupt router not found at "
765 "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
769 for( h = pirq_routers; h->vendor; h++) {
770 /* First look for a router match */
771 if (rt->rtr_vendor == h->vendor && h->probe(r, pirq_router_dev, rt->rtr_device))
773 /* Fall back to a device match */
774 if (pirq_router_dev->vendor == h->vendor && h->probe(r, pirq_router_dev, pirq_router_dev->device))
777 printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %s\n",
779 pirq_router_dev->vendor,
780 pirq_router_dev->device,
781 pci_name(pirq_router_dev));
784 static struct irq_info *pirq_get_info(struct pci_dev *dev)
786 struct irq_routing_table *rt = pirq_table;
787 int entries = (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
788 struct irq_info *info;
790 for (info = rt->slots; entries--; info++)
791 if (info->bus == dev->bus->number && PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
796 static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
799 struct irq_info *info;
803 struct irq_router *r = &pirq_router;
804 struct pci_dev *dev2 = NULL;
808 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
810 DBG(KERN_DEBUG " -> no interrupt pin\n");
815 /* Find IRQ routing entry */
820 DBG(KERN_DEBUG "IRQ for %s[%c]", pci_name(dev), 'A' + pin);
821 info = pirq_get_info(dev);
823 DBG(" -> not found in routing table\n" KERN_DEBUG);
826 pirq = info->irq[pin].link;
827 mask = info->irq[pin].bitmap;
829 DBG(" -> not routed\n" KERN_DEBUG);
832 DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask, pirq_table->exclusive_irqs);
833 mask &= pcibios_irq_mask;
835 /* Work around broken HP Pavilion Notebooks which assign USB to
836 IRQ 9 even though it is actually wired to IRQ 11 */
838 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
840 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
841 r->set(pirq_router_dev, dev, pirq, 11);
844 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
845 if (acer_tm360_irqrouting && dev->irq == 11 && dev->vendor == PCI_VENDOR_ID_O2) {
848 dev->irq = r->get(pirq_router_dev, dev, pirq);
849 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
853 * Find the best IRQ to assign: use the one
854 * reported by the device if possible.
857 if (newirq && !((1 << newirq) & mask)) {
858 if ( pci_probe & PCI_USE_PIRQ_MASK) newirq = 0;
859 else printk("\n" KERN_WARNING
860 "PCI: IRQ %i for device %s doesn't match PIRQ mask "
861 "- try pci=usepirqmask\n" KERN_DEBUG, newirq,
864 if (!newirq && assign) {
865 for (i = 0; i < 16; i++) {
866 if (!(mask & (1 << i)))
868 if (pirq_penalty[i] < pirq_penalty[newirq] && can_request_irq(i, SA_SHIRQ))
872 DBG(" -> newirq=%d", newirq);
874 /* Check if it is hardcoded */
875 if ((pirq & 0xf0) == 0xf0) {
877 DBG(" -> hardcoded IRQ %d\n", irq);
879 } else if ( r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
880 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask)) ) {
881 DBG(" -> got IRQ %d\n", irq);
883 eisa_set_level_irq(irq);
884 } else if (newirq && r->set && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
885 DBG(" -> assigning IRQ %d", newirq);
886 if (r->set(pirq_router_dev, dev, pirq, newirq)) {
887 eisa_set_level_irq(newirq);
895 DBG(" ... failed\n");
896 if (newirq && mask == (1 << newirq)) {
902 printk(KERN_INFO "PCI: %s IRQ %d for device %s\n", msg, irq, pci_name(dev));
904 /* Update IRQ for all devices with the same pirq value */
905 while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
906 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
910 info = pirq_get_info(dev2);
913 if (info->irq[pin].link == pirq) {
914 /* We refuse to override the dev->irq information. Give a warning! */
915 if ( dev2->irq && dev2->irq != irq && \
916 (!(pci_probe & PCI_USE_PIRQ_MASK) || \
917 ((1 << dev2->irq) & mask)) ) {
918 #ifndef CONFIG_PCI_MSI
919 printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
920 pci_name(dev2), dev2->irq, irq);
927 printk(KERN_INFO "PCI: Sharing IRQ %d with %s\n", irq, pci_name(dev2));
933 static void __init pcibios_fixup_irqs(void)
935 struct pci_dev *dev = NULL;
938 DBG(KERN_DEBUG "PCI: IRQ fixup\n");
939 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
941 * If the BIOS has set an out of range IRQ number, just ignore it.
942 * Also keep track of which IRQ's are already in use.
944 if (dev->irq >= 16) {
945 DBG(KERN_DEBUG "%s: ignoring bogus IRQ %d\n", pci_name(dev), dev->irq);
948 /* If the IRQ is already assigned to a PCI device, ignore its ISA use penalty */
949 if (pirq_penalty[dev->irq] >= 100 && pirq_penalty[dev->irq] < 100000)
950 pirq_penalty[dev->irq] = 0;
951 pirq_penalty[dev->irq]++;
955 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
956 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
957 #ifdef CONFIG_X86_IO_APIC
959 * Recalculate IRQ numbers if we use the I/O APIC.
961 if (io_apic_assign_pci_irqs)
966 pin--; /* interrupt pins are numbered starting from 1 */
967 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
969 * Busses behind bridges are typically not listed in the MP-table.
970 * In this case we have to look up the IRQ based on the parent bus,
971 * parent slot, and pin number. The SMP code detects such bridged
972 * busses itself so we should get into this branch reliably.
974 if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
975 struct pci_dev * bridge = dev->bus->self;
977 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
978 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
979 PCI_SLOT(bridge->devfn), pin);
981 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
982 pci_name(bridge), 'A' + pin, irq);
985 if (use_pci_vector() &&
986 !platform_legacy_irq(irq))
987 irq = IO_APIC_VECTOR(irq);
989 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
990 pci_name(dev), 'A' + pin, irq);
997 * Still no IRQ? Try to lookup one...
999 if (pin && !dev->irq)
1000 pcibios_lookup_irq(dev, 0);
1005 * Work around broken HP Pavilion Notebooks which assign USB to
1006 * IRQ 9 even though it is actually wired to IRQ 11
1008 static int __init fix_broken_hp_bios_irq9(struct dmi_system_id *d)
1010 if (!broken_hp_bios_irq9) {
1011 broken_hp_bios_irq9 = 1;
1012 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
1018 * Work around broken Acer TravelMate 360 Notebooks which assign
1019 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
1021 static int __init fix_acer_tm360_irqrouting(struct dmi_system_id *d)
1023 if (!acer_tm360_irqrouting) {
1024 acer_tm360_irqrouting = 1;
1025 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
1030 static struct dmi_system_id __initdata pciirq_dmi_table[] = {
1032 .callback = fix_broken_hp_bios_irq9,
1033 .ident = "HP Pavilion N5400 Series Laptop",
1035 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1036 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
1037 DMI_MATCH(DMI_PRODUCT_VERSION, "HP Pavilion Notebook Model GE"),
1038 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
1042 .callback = fix_acer_tm360_irqrouting,
1043 .ident = "Acer TravelMate 36x Laptop",
1045 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1046 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1052 static int __init pcibios_irq_init(void)
1054 DBG(KERN_DEBUG "PCI: IRQ init\n");
1056 if (pcibios_enable_irq || raw_pci_ops == NULL)
1059 dmi_check_system(pciirq_dmi_table);
1061 pirq_table = pirq_find_routing_table();
1063 #ifdef CONFIG_PCI_BIOS
1064 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
1065 pirq_table = pcibios_get_irq_routing_table();
1069 pirq_find_router(&pirq_router);
1070 if (pirq_table->exclusive_irqs) {
1072 for (i=0; i<16; i++)
1073 if (!(pirq_table->exclusive_irqs & (1 << i)))
1074 pirq_penalty[i] += 100;
1076 /* If we're using the I/O APIC, avoid using the PCI IRQ routing table */
1077 if (io_apic_assign_pci_irqs)
1081 pcibios_enable_irq = pirq_enable_irq;
1083 pcibios_fixup_irqs();
1087 subsys_initcall(pcibios_irq_init);
1090 static void pirq_penalize_isa_irq(int irq, int active)
1093 * If any ISAPnP device reports an IRQ in its list of possible
1094 * IRQ's, we try to avoid assigning it to PCI devices.
1098 pirq_penalty[irq] += 1000;
1100 pirq_penalty[irq] += 100;
1104 void pcibios_penalize_isa_irq(int irq, int active)
1108 acpi_penalize_isa_irq(irq, active);
1111 pirq_penalize_isa_irq(irq, active);
1114 static int pirq_enable_irq(struct pci_dev *dev)
1117 struct pci_dev *temp_dev;
1119 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1120 if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
1123 pin--; /* interrupt pins are numbered starting from 1 */
1125 if (io_apic_assign_pci_irqs) {
1128 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
1130 * Busses behind bridges are typically not listed in the MP-table.
1131 * In this case we have to look up the IRQ based on the parent bus,
1132 * parent slot, and pin number. The SMP code detects such bridged
1133 * busses itself so we should get into this branch reliably.
1136 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1137 struct pci_dev * bridge = dev->bus->self;
1139 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1140 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1141 PCI_SLOT(bridge->devfn), pin);
1143 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
1144 pci_name(bridge), 'A' + pin, irq);
1149 #ifdef CONFIG_PCI_MSI
1150 if (!platform_legacy_irq(irq))
1151 irq = IO_APIC_VECTOR(irq);
1153 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
1154 pci_name(dev), 'A' + pin, irq);
1158 msg = " Probably buggy MP table.";
1159 } else if (pci_probe & PCI_BIOS_IRQ_SCAN)
1162 msg = " Please try using pci=biosirq.";
1164 /* With IDE legacy devices the IRQ lookup failure is not a problem.. */
1165 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && !(dev->class & 0x5))
1168 printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
1169 'A' + pin, pci_name(dev), msg);
1174 int pci_vector_resources(int last, int nr_released)
1176 int count = nr_released;
1179 int offset = (last % 8);
1181 while (next < FIRST_SYSTEM_VECTOR) {
1183 #ifdef CONFIG_X86_64
1184 if (next == IA32_SYSCALL_VECTOR)
1187 if (next == SYSCALL_VECTOR)
1191 if (next >= FIRST_SYSTEM_VECTOR) {
1193 next = FIRST_DEVICE_VECTOR + offset;