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/irq.h>
15 #include <linux/dmi.h>
18 #include <asm/io_apic.h>
19 #include <asm/hw_irq.h>
20 #include <linux/acpi.h>
24 #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
25 #define PIRQ_VERSION 0x0100
27 static int broken_hp_bios_irq9;
28 static int acer_tm360_irqrouting;
30 static struct irq_routing_table *pirq_table;
32 static int pirq_enable_irq(struct pci_dev *dev);
35 * Never use: 0, 1, 2 (timer, keyboard, and cascade)
36 * Avoid using: 13, 14 and 15 (FP error and IDE).
37 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
39 unsigned int pcibios_irq_mask = 0xfff8;
41 static int pirq_penalty[16] = {
42 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
43 0, 0, 0, 0, 1000, 100000, 100000, 100000
49 int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
50 int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
53 struct irq_router_handler {
55 int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device);
58 int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL;
61 * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
64 static struct irq_routing_table * __init pirq_find_routing_table(void)
67 struct irq_routing_table *rt;
71 for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
72 rt = (struct irq_routing_table *) addr;
73 if (rt->signature != PIRQ_SIGNATURE ||
74 rt->version != PIRQ_VERSION ||
76 rt->size < sizeof(struct irq_routing_table))
79 for(i=0; i<rt->size; i++)
82 DBG("PCI: Interrupt Routing Table found at 0x%p\n", rt);
90 * If we have a IRQ routing table, use it to search for peer host
91 * bridges. It's a gross hack, but since there are no other known
92 * ways how to get a list of buses, we have to go this way.
95 static void __init pirq_peer_trick(void)
97 struct irq_routing_table *rt = pirq_table;
102 memset(busmap, 0, sizeof(busmap));
103 for(i=0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
108 DBG("%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
110 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
116 for(i = 1; i < 256; i++) {
117 if (!busmap[i] || pci_find_bus(0, i))
119 if (pci_scan_bus(i, &pci_root_ops, NULL))
120 printk(KERN_INFO "PCI: Discovered primary peer bus %02x [IRQ]\n", i);
122 pcibios_last_bus = -1;
126 * Code for querying and setting of IRQ routes on various interrupt routers.
129 void eisa_set_level_irq(unsigned int irq)
131 unsigned char mask = 1 << (irq & 7);
132 unsigned int port = 0x4d0 + (irq >> 3);
134 static u16 eisa_irq_mask;
136 if (irq >= 16 || (1 << irq) & eisa_irq_mask)
139 eisa_irq_mask |= (1 << irq);
140 printk("PCI: setting IRQ %u as level-triggered\n", irq);
144 outb(val | mask, port);
149 * Common IRQ routing practice: nybbles in config space,
150 * offset by some magic constant.
152 static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
155 unsigned reg = offset + (nr >> 1);
157 pci_read_config_byte(router, reg, &x);
158 return (nr & 1) ? (x >> 4) : (x & 0xf);
161 static void write_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr, unsigned int val)
164 unsigned reg = offset + (nr >> 1);
166 pci_read_config_byte(router, reg, &x);
167 x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
168 pci_write_config_byte(router, reg, x);
172 * ALI pirq entries are damn ugly, and completely undocumented.
173 * This has been figured out from pirq tables, and it's not a pretty
176 static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
178 static unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
180 return irqmap[read_config_nybble(router, 0x48, pirq-1)];
183 static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
185 static unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
186 unsigned int val = irqmap[irq];
189 write_config_nybble(router, 0x48, pirq-1, val);
196 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
197 * just a pointer to the config space.
199 static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
203 pci_read_config_byte(router, pirq, &x);
204 return (x < 16) ? x : 0;
207 static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
209 pci_write_config_byte(router, pirq, irq);
214 * The VIA pirq rules are nibble-based, like ALI,
215 * but without the ugly irq number munging.
216 * However, PIRQD is in the upper instead of lower 4 bits.
218 static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
220 return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
223 static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
225 write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
230 * ITE 8330G pirq rules are nibble-based
231 * FIXME: pirqmap may be { 1, 0, 3, 2 },
232 * 2+3 are both mapped to irq 9 on my system
234 static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
236 static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
237 return read_config_nybble(router,0x43, pirqmap[pirq-1]);
240 static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
242 static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
243 write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
248 * OPTI: high four bits are nibble pointer..
249 * I wonder what the low bits do?
251 static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
253 return read_config_nybble(router, 0xb8, pirq >> 4);
256 static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
258 write_config_nybble(router, 0xb8, pirq >> 4, irq);
263 * Cyrix: nibble offset 0x5C
264 * 0x5C bits 7:4 is INTB bits 3:0 is INTA
265 * 0x5D bits 7:4 is INTD bits 3:0 is INTC
267 static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
269 return read_config_nybble(router, 0x5C, (pirq-1)^1);
272 static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
274 write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
279 * PIRQ routing for SiS 85C503 router used in several SiS chipsets.
280 * We have to deal with the following issues here:
281 * - vendors have different ideas about the meaning of link values
282 * - some onboard devices (integrated in the chipset) have special
283 * links and are thus routed differently (i.e. not via PCI INTA-INTD)
284 * - different revision of the router have a different layout for
285 * the routing registers, particularly for the onchip devices
287 * For all routing registers the common thing is we have one byte
288 * per routeable link which is defined as:
289 * bit 7 IRQ mapping enabled (0) or disabled (1)
290 * bits [6:4] reserved (sometimes used for onchip devices)
291 * bits [3:0] IRQ to map to
292 * allowed: 3-7, 9-12, 14-15
293 * reserved: 0, 1, 2, 8, 13
295 * The config-space registers located at 0x41/0x42/0x43/0x44 are
296 * always used to route the normal PCI INT A/B/C/D respectively.
297 * Apparently there are systems implementing PCI routing table using
298 * link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
299 * We try our best to handle both link mappings.
301 * Currently (2003-05-21) it appears most SiS chipsets follow the
302 * definition of routing registers from the SiS-5595 southbridge.
303 * According to the SiS 5595 datasheets the revision id's of the
304 * router (ISA-bridge) should be 0x01 or 0xb0.
306 * Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
307 * Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
308 * They seem to work with the current routing code. However there is
309 * some concern because of the two USB-OHCI HCs (original SiS 5595
310 * had only one). YMMV.
312 * Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
315 * bits [6:5] must be written 01
316 * bit 4 channel-select primary (0), secondary (1)
319 * bit 6 OHCI function disabled (0), enabled (1)
321 * 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
323 * 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
325 * We support USBIRQ (in addition to INTA-INTD) and keep the
326 * IDE, ACPI and DAQ routing untouched as set by the BIOS.
328 * Currently the only reported exception is the new SiS 65x chipset
329 * which includes the SiS 69x southbridge. Here we have the 85C503
330 * router revision 0x04 and there are changes in the register layout
331 * mostly related to the different USB HCs with USB 2.0 support.
333 * Onchip routing for router rev-id 0x04 (try-and-error observation)
335 * 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
336 * bit 6-4 are probably unused, not like 5595
339 #define PIRQ_SIS_IRQ_MASK 0x0f
340 #define PIRQ_SIS_IRQ_DISABLE 0x80
341 #define PIRQ_SIS_USB_ENABLE 0x40
343 static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
349 if (reg >= 0x01 && reg <= 0x04)
351 pci_read_config_byte(router, reg, &x);
352 return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
355 static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
361 if (reg >= 0x01 && reg <= 0x04)
363 pci_read_config_byte(router, reg, &x);
364 x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
365 x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
366 pci_write_config_byte(router, reg, x);
372 * VLSI: nibble offset 0x74 - educated guess due to routing table and
373 * config space of VLSI 82C534 PCI-bridge/router (1004:0102)
374 * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
375 * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
376 * for the busbridge to the docking station.
379 static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
382 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
385 return read_config_nybble(router, 0x74, pirq-1);
388 static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
391 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
394 write_config_nybble(router, 0x74, pirq-1, irq);
399 * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
400 * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
401 * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
402 * register is a straight binary coding of desired PIC IRQ (low nibble).
404 * The 'link' value in the PIRQ table is already in the correct format
405 * for the Index register. There are some special index values:
406 * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
407 * and 0x03 for SMBus.
409 static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
412 return inb(0xc01) & 0xf;
415 static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
422 /* Support for AMD756 PCI IRQ Routing
423 * Jhon H. Caicedo <jhcaiced@osso.org.co>
424 * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
425 * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
426 * The AMD756 pirq rules are nibble-based
427 * offset 0x56 0-3 PIRQA 4-7 PIRQB
428 * offset 0x57 0-3 PIRQC 4-7 PIRQD
430 static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
436 irq = read_config_nybble(router, 0x56, pirq - 1);
438 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d get irq : %2d\n",
439 dev->vendor, dev->device, pirq, irq);
443 static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
445 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d SET irq : %2d\n",
446 dev->vendor, dev->device, pirq, irq);
449 write_config_nybble(router, 0x56, pirq - 1, irq);
454 #ifdef CONFIG_PCI_BIOS
456 static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
458 struct pci_dev *bridge;
459 int pin = pci_get_interrupt_pin(dev, &bridge);
460 return pcibios_set_irq_routing(bridge, pin, irq);
465 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
467 static struct pci_device_id pirq_440gx[] = {
468 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
469 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
473 /* 440GX has a proprietary PIRQ router -- don't use it */
474 if (pci_dev_present(pirq_440gx))
479 case PCI_DEVICE_ID_INTEL_82371FB_0:
480 case PCI_DEVICE_ID_INTEL_82371SB_0:
481 case PCI_DEVICE_ID_INTEL_82371AB_0:
482 case PCI_DEVICE_ID_INTEL_82371MX:
483 case PCI_DEVICE_ID_INTEL_82443MX_0:
484 case PCI_DEVICE_ID_INTEL_82801AA_0:
485 case PCI_DEVICE_ID_INTEL_82801AB_0:
486 case PCI_DEVICE_ID_INTEL_82801BA_0:
487 case PCI_DEVICE_ID_INTEL_82801BA_10:
488 case PCI_DEVICE_ID_INTEL_82801CA_0:
489 case PCI_DEVICE_ID_INTEL_82801CA_12:
490 case PCI_DEVICE_ID_INTEL_82801DB_0:
491 case PCI_DEVICE_ID_INTEL_82801E_0:
492 case PCI_DEVICE_ID_INTEL_82801EB_0:
493 case PCI_DEVICE_ID_INTEL_ESB_1:
494 case PCI_DEVICE_ID_INTEL_ICH6_0:
495 case PCI_DEVICE_ID_INTEL_ICH6_1:
496 case PCI_DEVICE_ID_INTEL_ICH7_0:
497 case PCI_DEVICE_ID_INTEL_ICH7_1:
498 case PCI_DEVICE_ID_INTEL_ICH7_30:
499 case PCI_DEVICE_ID_INTEL_ICH7_31:
500 case PCI_DEVICE_ID_INTEL_ESB2_0:
501 r->name = "PIIX/ICH";
502 r->get = pirq_piix_get;
503 r->set = pirq_piix_set;
509 static __init int via_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
511 /* FIXME: We should move some of the quirk fixup stuff here */
514 case PCI_DEVICE_ID_VIA_82C586_0:
515 case PCI_DEVICE_ID_VIA_82C596:
516 case PCI_DEVICE_ID_VIA_82C686:
517 case PCI_DEVICE_ID_VIA_8231:
518 /* FIXME: add new ones for 8233/5 */
520 r->get = pirq_via_get;
521 r->set = pirq_via_set;
527 static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
531 case PCI_DEVICE_ID_VLSI_82C534:
532 r->name = "VLSI 82C534";
533 r->get = pirq_vlsi_get;
534 r->set = pirq_vlsi_set;
541 static __init int serverworks_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
545 case PCI_DEVICE_ID_SERVERWORKS_OSB4:
546 case PCI_DEVICE_ID_SERVERWORKS_CSB5:
547 r->name = "ServerWorks";
548 r->get = pirq_serverworks_get;
549 r->set = pirq_serverworks_set;
555 static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
557 if (device != PCI_DEVICE_ID_SI_503)
561 r->get = pirq_sis_get;
562 r->set = pirq_sis_set;
566 static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
570 case PCI_DEVICE_ID_CYRIX_5520:
572 r->get = pirq_cyrix_get;
573 r->set = pirq_cyrix_set;
579 static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
583 case PCI_DEVICE_ID_OPTI_82C700:
585 r->get = pirq_opti_get;
586 r->set = pirq_opti_set;
592 static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
596 case PCI_DEVICE_ID_ITE_IT8330G_0:
598 r->get = pirq_ite_get;
599 r->set = pirq_ite_set;
605 static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
609 case PCI_DEVICE_ID_AL_M1533:
610 case PCI_DEVICE_ID_AL_M1563:
611 printk("PCI: Using ALI IRQ Router\n");
613 r->get = pirq_ali_get;
614 r->set = pirq_ali_set;
620 static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
624 case PCI_DEVICE_ID_AMD_VIPER_740B:
627 case PCI_DEVICE_ID_AMD_VIPER_7413:
630 case PCI_DEVICE_ID_AMD_VIPER_7443:
636 r->get = pirq_amd756_get;
637 r->set = pirq_amd756_set;
641 static __initdata struct irq_router_handler pirq_routers[] = {
642 { PCI_VENDOR_ID_INTEL, intel_router_probe },
643 { PCI_VENDOR_ID_AL, ali_router_probe },
644 { PCI_VENDOR_ID_ITE, ite_router_probe },
645 { PCI_VENDOR_ID_VIA, via_router_probe },
646 { PCI_VENDOR_ID_OPTI, opti_router_probe },
647 { PCI_VENDOR_ID_SI, sis_router_probe },
648 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
649 { PCI_VENDOR_ID_VLSI, vlsi_router_probe },
650 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
651 { PCI_VENDOR_ID_AMD, amd_router_probe },
652 /* Someone with docs needs to add the ATI Radeon IGP */
655 static struct irq_router pirq_router;
656 static struct pci_dev *pirq_router_dev;
660 * FIXME: should we have an option to say "generic for
664 static void __init pirq_find_router(struct irq_router *r)
666 struct irq_routing_table *rt = pirq_table;
667 struct irq_router_handler *h;
669 #ifdef CONFIG_PCI_BIOS
670 if (!rt->signature) {
671 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
672 r->set = pirq_bios_set;
678 /* Default unless a driver reloads it */
683 DBG("PCI: Attempting to find IRQ router for %04x:%04x\n",
684 rt->rtr_vendor, rt->rtr_device);
686 pirq_router_dev = pci_find_slot(rt->rtr_bus, rt->rtr_devfn);
687 if (!pirq_router_dev) {
688 DBG("PCI: Interrupt router not found at %02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
692 for( h = pirq_routers; h->vendor; h++) {
693 /* First look for a router match */
694 if (rt->rtr_vendor == h->vendor && h->probe(r, pirq_router_dev, rt->rtr_device))
696 /* Fall back to a device match */
697 if (pirq_router_dev->vendor == h->vendor && h->probe(r, pirq_router_dev, pirq_router_dev->device))
700 printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %s\n",
702 pirq_router_dev->vendor,
703 pirq_router_dev->device,
704 pci_name(pirq_router_dev));
707 static struct irq_info *pirq_get_info(struct pci_dev *dev)
709 struct irq_routing_table *rt = pirq_table;
710 int entries = (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
711 struct irq_info *info;
713 for (info = rt->slots; entries--; info++)
714 if (info->bus == dev->bus->number && PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
719 static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
722 struct irq_info *info;
726 struct irq_router *r = &pirq_router;
727 struct pci_dev *dev2 = NULL;
731 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
733 DBG(" -> no interrupt pin\n");
738 /* Find IRQ routing entry */
743 DBG("IRQ for %s[%c]", pci_name(dev), 'A' + pin);
744 info = pirq_get_info(dev);
746 DBG(" -> not found in routing table\n");
749 pirq = info->irq[pin].link;
750 mask = info->irq[pin].bitmap;
752 DBG(" -> not routed\n");
755 DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask, pirq_table->exclusive_irqs);
756 mask &= pcibios_irq_mask;
758 /* Work around broken HP Pavilion Notebooks which assign USB to
759 IRQ 9 even though it is actually wired to IRQ 11 */
761 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
763 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
764 r->set(pirq_router_dev, dev, pirq, 11);
767 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
768 if (acer_tm360_irqrouting && dev->irq == 11 && dev->vendor == PCI_VENDOR_ID_O2) {
771 dev->irq = r->get(pirq_router_dev, dev, pirq);
772 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
776 * Find the best IRQ to assign: use the one
777 * reported by the device if possible.
780 if (!((1 << newirq) & mask)) {
781 if ( pci_probe & PCI_USE_PIRQ_MASK) newirq = 0;
782 else printk(KERN_WARNING "PCI: IRQ %i for device %s doesn't match PIRQ mask - try pci=usepirqmask\n", newirq, pci_name(dev));
784 if (!newirq && assign) {
785 for (i = 0; i < 16; i++) {
786 if (!(mask & (1 << i)))
788 if (pirq_penalty[i] < pirq_penalty[newirq] && can_request_irq(i, SA_SHIRQ))
792 DBG(" -> newirq=%d", newirq);
794 /* Check if it is hardcoded */
795 if ((pirq & 0xf0) == 0xf0) {
797 DBG(" -> hardcoded IRQ %d\n", irq);
799 } else if ( r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
800 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask)) ) {
801 DBG(" -> got IRQ %d\n", irq);
803 } else if (newirq && r->set && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
804 DBG(" -> assigning IRQ %d", newirq);
805 if (r->set(pirq_router_dev, dev, pirq, newirq)) {
806 eisa_set_level_irq(newirq);
814 DBG(" ... failed\n");
815 if (newirq && mask == (1 << newirq)) {
821 printk(KERN_INFO "PCI: %s IRQ %d for device %s\n", msg, irq, pci_name(dev));
823 /* Update IRQ for all devices with the same pirq value */
824 while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
825 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
829 info = pirq_get_info(dev2);
832 if (info->irq[pin].link == pirq) {
833 /* We refuse to override the dev->irq information. Give a warning! */
834 if ( dev2->irq && dev2->irq != irq && \
835 (!(pci_probe & PCI_USE_PIRQ_MASK) || \
836 ((1 << dev2->irq) & mask)) ) {
837 #ifndef CONFIG_PCI_MSI
838 printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
839 pci_name(dev2), dev2->irq, irq);
846 printk(KERN_INFO "PCI: Sharing IRQ %d with %s\n", irq, pci_name(dev2));
852 static void __init pcibios_fixup_irqs(void)
854 struct pci_dev *dev = NULL;
857 DBG("PCI: IRQ fixup\n");
858 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
860 * If the BIOS has set an out of range IRQ number, just ignore it.
861 * Also keep track of which IRQ's are already in use.
863 if (dev->irq >= 16) {
864 DBG("%s: ignoring bogus IRQ %d\n", pci_name(dev), dev->irq);
867 /* If the IRQ is already assigned to a PCI device, ignore its ISA use penalty */
868 if (pirq_penalty[dev->irq] >= 100 && pirq_penalty[dev->irq] < 100000)
869 pirq_penalty[dev->irq] = 0;
870 pirq_penalty[dev->irq]++;
874 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
875 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
876 #ifdef CONFIG_X86_IO_APIC
878 * Recalculate IRQ numbers if we use the I/O APIC.
880 if (io_apic_assign_pci_irqs)
885 pin--; /* interrupt pins are numbered starting from 1 */
886 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
888 * Busses behind bridges are typically not listed in the MP-table.
889 * In this case we have to look up the IRQ based on the parent bus,
890 * parent slot, and pin number. The SMP code detects such bridged
891 * busses itself so we should get into this branch reliably.
893 if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
894 struct pci_dev * bridge = dev->bus->self;
896 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
897 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
898 PCI_SLOT(bridge->devfn), pin);
900 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
901 pci_name(bridge), 'A' + pin, irq);
904 if (use_pci_vector() &&
905 !platform_legacy_irq(irq))
906 irq = IO_APIC_VECTOR(irq);
908 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
909 pci_name(dev), 'A' + pin, irq);
916 * Still no IRQ? Try to lookup one...
918 if (pin && !dev->irq)
919 pcibios_lookup_irq(dev, 0);
924 * Work around broken HP Pavilion Notebooks which assign USB to
925 * IRQ 9 even though it is actually wired to IRQ 11
927 static int __init fix_broken_hp_bios_irq9(struct dmi_system_id *d)
929 if (!broken_hp_bios_irq9) {
930 broken_hp_bios_irq9 = 1;
931 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
937 * Work around broken Acer TravelMate 360 Notebooks which assign
938 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
940 static int __init fix_acer_tm360_irqrouting(struct dmi_system_id *d)
942 if (!acer_tm360_irqrouting) {
943 acer_tm360_irqrouting = 1;
944 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
949 static struct dmi_system_id __initdata pciirq_dmi_table[] = {
951 .callback = fix_broken_hp_bios_irq9,
952 .ident = "HP Pavilion N5400 Series Laptop",
954 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
955 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
956 DMI_MATCH(DMI_PRODUCT_VERSION, "HP Pavilion Notebook Model GE"),
957 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
961 .callback = fix_acer_tm360_irqrouting,
962 .ident = "Acer TravelMate 36x Laptop",
964 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
965 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
971 static int __init pcibios_irq_init(void)
973 DBG("PCI: IRQ init\n");
975 if (pcibios_enable_irq || raw_pci_ops == NULL)
978 dmi_check_system(pciirq_dmi_table);
980 pirq_table = pirq_find_routing_table();
982 #ifdef CONFIG_PCI_BIOS
983 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
984 pirq_table = pcibios_get_irq_routing_table();
988 pirq_find_router(&pirq_router);
989 if (pirq_table->exclusive_irqs) {
992 if (!(pirq_table->exclusive_irqs & (1 << i)))
993 pirq_penalty[i] += 100;
995 /* If we're using the I/O APIC, avoid using the PCI IRQ routing table */
996 if (io_apic_assign_pci_irqs)
1000 pcibios_enable_irq = pirq_enable_irq;
1002 pcibios_fixup_irqs();
1006 subsys_initcall(pcibios_irq_init);
1009 static void pirq_penalize_isa_irq(int irq)
1012 * If any ISAPnP device reports an IRQ in its list of possible
1013 * IRQ's, we try to avoid assigning it to PCI devices.
1016 pirq_penalty[irq] += 100;
1019 void pcibios_penalize_isa_irq(int irq)
1021 #ifdef CONFIG_ACPI_PCI
1023 acpi_penalize_isa_irq(irq);
1026 pirq_penalize_isa_irq(irq);
1029 static int pirq_enable_irq(struct pci_dev *dev)
1032 struct pci_dev *temp_dev;
1034 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1035 if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
1038 pin--; /* interrupt pins are numbered starting from 1 */
1040 if (io_apic_assign_pci_irqs) {
1043 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
1045 * Busses behind bridges are typically not listed in the MP-table.
1046 * In this case we have to look up the IRQ based on the parent bus,
1047 * parent slot, and pin number. The SMP code detects such bridged
1048 * busses itself so we should get into this branch reliably.
1051 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1052 struct pci_dev * bridge = dev->bus->self;
1054 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1055 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1056 PCI_SLOT(bridge->devfn), pin);
1058 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
1059 pci_name(bridge), 'A' + pin, irq);
1064 #ifdef CONFIG_PCI_MSI
1065 if (!platform_legacy_irq(irq))
1066 irq = IO_APIC_VECTOR(irq);
1068 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
1069 pci_name(dev), 'A' + pin, irq);
1073 msg = " Probably buggy MP table.";
1074 } else if (pci_probe & PCI_BIOS_IRQ_SCAN)
1077 msg = " Please try using pci=biosirq.";
1079 /* With IDE legacy devices the IRQ lookup failure is not a problem.. */
1080 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && !(dev->class & 0x5))
1083 printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
1084 'A' + pin, pci_name(dev), msg);
1089 int pci_vector_resources(int last, int nr_released)
1091 int count = nr_released;
1094 int offset = (last % 8);
1096 while (next < FIRST_SYSTEM_VECTOR) {
1098 #ifdef CONFIG_X86_64
1099 if (next == IA32_SYSCALL_VECTOR)
1102 if (next == SYSCALL_VECTOR)
1106 if (next >= FIRST_SYSTEM_VECTOR) {
1108 next = FIRST_DEVICE_VECTOR + offset;