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>
16 #include <asm/io_apic.h>
17 #include <linux/irq.h>
18 #include <linux/acpi.h>
22 #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
23 #define PIRQ_VERSION 0x0100
25 static int broken_hp_bios_irq9;
26 static int acer_tm360_irqrouting;
28 static struct irq_routing_table *pirq_table;
30 static int pirq_enable_irq(struct pci_dev *dev);
33 * Never use: 0, 1, 2 (timer, keyboard, and cascade)
34 * Avoid using: 13, 14 and 15 (FP error and IDE).
35 * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
37 unsigned int pcibios_irq_mask = 0xfff8;
39 static int pirq_penalty[16] = {
40 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
41 0, 0, 0, 0, 1000, 100000, 100000, 100000
47 int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
48 int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
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", rt);
89 * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
92 static struct irq_routing_table * __init pirq_find_routing_table(void)
95 struct irq_routing_table *rt;
97 if (pirq_table_addr) {
98 rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
101 printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
103 for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
104 rt = pirq_check_routing_table(addr);
112 * If we have a IRQ routing table, use it to search for peer host
113 * bridges. It's a gross hack, but since there are no other known
114 * ways how to get a list of buses, we have to go this way.
117 static void __init pirq_peer_trick(void)
119 struct irq_routing_table *rt = pirq_table;
124 memset(busmap, 0, sizeof(busmap));
125 for(i=0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
130 DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
132 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
138 for(i = 1; i < 256; i++) {
139 if (!busmap[i] || pci_find_bus(0, i))
141 if (pci_scan_bus_with_sysdata(i))
142 printk(KERN_INFO "PCI: Discovered primary peer "
143 "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[5] = { 3, 2, 5, 1, 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[5] = { 3, 2, 5, 1, 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);
498 static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
500 outb(0x10 + ((pirq - 1) >> 1), 0x24);
501 return ((pirq - 1) & 1) ? (inb(0x26) >> 4) : (inb(0x26) & 0xf);
504 static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
508 outb(0x10 + ((pirq - 1) >> 1), 0x24);
510 x = ((pirq - 1) & 1) ? ((x & 0x0f) | (irq << 4)) : ((x & 0xf0) | (irq));
515 #ifdef CONFIG_PCI_BIOS
517 static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
519 struct pci_dev *bridge;
520 int pin = pci_get_interrupt_pin(dev, &bridge);
521 return pcibios_set_irq_routing(bridge, pin, irq);
526 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
528 static struct pci_device_id __initdata pirq_440gx[] = {
529 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
530 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
534 /* 440GX has a proprietary PIRQ router -- don't use it */
535 if (pci_dev_present(pirq_440gx))
540 case PCI_DEVICE_ID_INTEL_82371FB_0:
541 case PCI_DEVICE_ID_INTEL_82371SB_0:
542 case PCI_DEVICE_ID_INTEL_82371AB_0:
543 case PCI_DEVICE_ID_INTEL_82371MX:
544 case PCI_DEVICE_ID_INTEL_82443MX_0:
545 case PCI_DEVICE_ID_INTEL_82801AA_0:
546 case PCI_DEVICE_ID_INTEL_82801AB_0:
547 case PCI_DEVICE_ID_INTEL_82801BA_0:
548 case PCI_DEVICE_ID_INTEL_82801BA_10:
549 case PCI_DEVICE_ID_INTEL_82801CA_0:
550 case PCI_DEVICE_ID_INTEL_82801CA_12:
551 case PCI_DEVICE_ID_INTEL_82801DB_0:
552 case PCI_DEVICE_ID_INTEL_82801E_0:
553 case PCI_DEVICE_ID_INTEL_82801EB_0:
554 case PCI_DEVICE_ID_INTEL_ESB_1:
555 case PCI_DEVICE_ID_INTEL_ICH6_0:
556 case PCI_DEVICE_ID_INTEL_ICH6_1:
557 case PCI_DEVICE_ID_INTEL_ICH7_0:
558 case PCI_DEVICE_ID_INTEL_ICH7_1:
559 case PCI_DEVICE_ID_INTEL_ICH7_30:
560 case PCI_DEVICE_ID_INTEL_ICH7_31:
561 case PCI_DEVICE_ID_INTEL_ESB2_0:
562 case PCI_DEVICE_ID_INTEL_ICH8_0:
563 case PCI_DEVICE_ID_INTEL_ICH8_1:
564 case PCI_DEVICE_ID_INTEL_ICH8_2:
565 case PCI_DEVICE_ID_INTEL_ICH8_3:
566 case PCI_DEVICE_ID_INTEL_ICH8_4:
567 case PCI_DEVICE_ID_INTEL_ICH9_0:
568 case PCI_DEVICE_ID_INTEL_ICH9_1:
569 case PCI_DEVICE_ID_INTEL_ICH9_2:
570 case PCI_DEVICE_ID_INTEL_ICH9_3:
571 case PCI_DEVICE_ID_INTEL_ICH9_4:
572 case PCI_DEVICE_ID_INTEL_ICH9_5:
573 case PCI_DEVICE_ID_INTEL_TOLAPAI_0:
574 r->name = "PIIX/ICH";
575 r->get = pirq_piix_get;
576 r->set = pirq_piix_set;
582 static __init int via_router_probe(struct irq_router *r,
583 struct pci_dev *router, u16 device)
585 /* FIXME: We should move some of the quirk fixup stuff here */
588 * work arounds for some buggy BIOSes
590 if (device == PCI_DEVICE_ID_VIA_82C586_0) {
591 switch(router->device) {
592 case PCI_DEVICE_ID_VIA_82C686:
594 * Asus k7m bios wrongly reports 82C686A
597 device = PCI_DEVICE_ID_VIA_82C686;
599 case PCI_DEVICE_ID_VIA_8235:
601 * Asus a7v-x bios wrongly reports 8235
604 device = PCI_DEVICE_ID_VIA_8235;
610 case PCI_DEVICE_ID_VIA_82C586_0:
612 r->get = pirq_via586_get;
613 r->set = pirq_via586_set;
615 case PCI_DEVICE_ID_VIA_82C596:
616 case PCI_DEVICE_ID_VIA_82C686:
617 case PCI_DEVICE_ID_VIA_8231:
618 case PCI_DEVICE_ID_VIA_8233A:
619 case PCI_DEVICE_ID_VIA_8235:
620 case PCI_DEVICE_ID_VIA_8237:
621 /* FIXME: add new ones for 8233/5 */
623 r->get = pirq_via_get;
624 r->set = pirq_via_set;
630 static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
634 case PCI_DEVICE_ID_VLSI_82C534:
635 r->name = "VLSI 82C534";
636 r->get = pirq_vlsi_get;
637 r->set = pirq_vlsi_set;
644 static __init int serverworks_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
648 case PCI_DEVICE_ID_SERVERWORKS_OSB4:
649 case PCI_DEVICE_ID_SERVERWORKS_CSB5:
650 r->name = "ServerWorks";
651 r->get = pirq_serverworks_get;
652 r->set = pirq_serverworks_set;
658 static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
660 if (device != PCI_DEVICE_ID_SI_503)
664 r->get = pirq_sis_get;
665 r->set = pirq_sis_set;
669 static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
673 case PCI_DEVICE_ID_CYRIX_5520:
675 r->get = pirq_cyrix_get;
676 r->set = pirq_cyrix_set;
682 static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
686 case PCI_DEVICE_ID_OPTI_82C700:
688 r->get = pirq_opti_get;
689 r->set = pirq_opti_set;
695 static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
699 case PCI_DEVICE_ID_ITE_IT8330G_0:
701 r->get = pirq_ite_get;
702 r->set = pirq_ite_set;
708 static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
712 case PCI_DEVICE_ID_AL_M1533:
713 case PCI_DEVICE_ID_AL_M1563:
714 printk(KERN_DEBUG "PCI: Using ALI IRQ Router\n");
716 r->get = pirq_ali_get;
717 r->set = pirq_ali_set;
723 static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
727 case PCI_DEVICE_ID_AMD_VIPER_740B:
730 case PCI_DEVICE_ID_AMD_VIPER_7413:
733 case PCI_DEVICE_ID_AMD_VIPER_7443:
739 r->get = pirq_amd756_get;
740 r->set = pirq_amd756_set;
744 static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
747 case PCI_DEVICE_ID_PICOPOWER_PT86C523:
748 r->name = "PicoPower PT86C523";
749 r->get = pirq_pico_get;
750 r->set = pirq_pico_set;
753 case PCI_DEVICE_ID_PICOPOWER_PT86C523BBP:
754 r->name = "PicoPower PT86C523 rev. BB+";
755 r->get = pirq_pico_get;
756 r->set = pirq_pico_set;
762 static __initdata struct irq_router_handler pirq_routers[] = {
763 { PCI_VENDOR_ID_INTEL, intel_router_probe },
764 { PCI_VENDOR_ID_AL, ali_router_probe },
765 { PCI_VENDOR_ID_ITE, ite_router_probe },
766 { PCI_VENDOR_ID_VIA, via_router_probe },
767 { PCI_VENDOR_ID_OPTI, opti_router_probe },
768 { PCI_VENDOR_ID_SI, sis_router_probe },
769 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
770 { PCI_VENDOR_ID_VLSI, vlsi_router_probe },
771 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
772 { PCI_VENDOR_ID_AMD, amd_router_probe },
773 { PCI_VENDOR_ID_PICOPOWER, pico_router_probe },
774 /* Someone with docs needs to add the ATI Radeon IGP */
777 static struct irq_router pirq_router;
778 static struct pci_dev *pirq_router_dev;
782 * FIXME: should we have an option to say "generic for
786 static void __init pirq_find_router(struct irq_router *r)
788 struct irq_routing_table *rt = pirq_table;
789 struct irq_router_handler *h;
791 #ifdef CONFIG_PCI_BIOS
792 if (!rt->signature) {
793 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
794 r->set = pirq_bios_set;
800 /* Default unless a driver reloads it */
805 DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for %04x:%04x\n",
806 rt->rtr_vendor, rt->rtr_device);
808 pirq_router_dev = pci_get_bus_and_slot(rt->rtr_bus, rt->rtr_devfn);
809 if (!pirq_router_dev) {
810 DBG(KERN_DEBUG "PCI: Interrupt router not found at "
811 "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
815 for( h = pirq_routers; h->vendor; h++) {
816 /* First look for a router match */
817 if (rt->rtr_vendor == h->vendor && h->probe(r, pirq_router_dev, rt->rtr_device))
819 /* Fall back to a device match */
820 if (pirq_router_dev->vendor == h->vendor && h->probe(r, pirq_router_dev, pirq_router_dev->device))
823 printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %s\n",
825 pirq_router_dev->vendor,
826 pirq_router_dev->device,
827 pci_name(pirq_router_dev));
829 /* The device remains referenced for the kernel lifetime */
832 static struct irq_info *pirq_get_info(struct pci_dev *dev)
834 struct irq_routing_table *rt = pirq_table;
835 int entries = (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
836 struct irq_info *info;
838 for (info = rt->slots; entries--; info++)
839 if (info->bus == dev->bus->number && PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
844 static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
847 struct irq_info *info;
851 struct irq_router *r = &pirq_router;
852 struct pci_dev *dev2 = NULL;
856 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
858 DBG(KERN_DEBUG " -> no interrupt pin\n");
863 /* Find IRQ routing entry */
868 DBG(KERN_DEBUG "IRQ for %s[%c]", pci_name(dev), 'A' + pin);
869 info = pirq_get_info(dev);
871 DBG(" -> not found in routing table\n" KERN_DEBUG);
874 pirq = info->irq[pin].link;
875 mask = info->irq[pin].bitmap;
877 DBG(" -> not routed\n" KERN_DEBUG);
880 DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask, pirq_table->exclusive_irqs);
881 mask &= pcibios_irq_mask;
883 /* Work around broken HP Pavilion Notebooks which assign USB to
884 IRQ 9 even though it is actually wired to IRQ 11 */
886 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
888 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
889 r->set(pirq_router_dev, dev, pirq, 11);
892 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
893 if (acer_tm360_irqrouting && dev->irq == 11 && dev->vendor == PCI_VENDOR_ID_O2) {
896 dev->irq = r->get(pirq_router_dev, dev, pirq);
897 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
901 * Find the best IRQ to assign: use the one
902 * reported by the device if possible.
905 if (newirq && !((1 << newirq) & mask)) {
906 if ( pci_probe & PCI_USE_PIRQ_MASK) newirq = 0;
907 else printk("\n" KERN_WARNING
908 "PCI: IRQ %i for device %s doesn't match PIRQ mask "
909 "- try pci=usepirqmask\n" KERN_DEBUG, newirq,
912 if (!newirq && assign) {
913 for (i = 0; i < 16; i++) {
914 if (!(mask & (1 << i)))
916 if (pirq_penalty[i] < pirq_penalty[newirq] && can_request_irq(i, IRQF_SHARED))
920 DBG(" -> newirq=%d", newirq);
922 /* Check if it is hardcoded */
923 if ((pirq & 0xf0) == 0xf0) {
925 DBG(" -> hardcoded IRQ %d\n", irq);
927 } else if ( r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
928 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask)) ) {
929 DBG(" -> got IRQ %d\n", irq);
931 eisa_set_level_irq(irq);
932 } else if (newirq && r->set && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
933 DBG(" -> assigning IRQ %d", newirq);
934 if (r->set(pirq_router_dev, dev, pirq, newirq)) {
935 eisa_set_level_irq(newirq);
943 DBG(" ... failed\n");
944 if (newirq && mask == (1 << newirq)) {
950 printk(KERN_INFO "PCI: %s IRQ %d for device %s\n", msg, irq, pci_name(dev));
952 /* Update IRQ for all devices with the same pirq value */
953 while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
954 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
958 info = pirq_get_info(dev2);
961 if (info->irq[pin].link == pirq) {
962 /* We refuse to override the dev->irq information. Give a warning! */
963 if ( dev2->irq && dev2->irq != irq && \
964 (!(pci_probe & PCI_USE_PIRQ_MASK) || \
965 ((1 << dev2->irq) & mask)) ) {
966 #ifndef CONFIG_PCI_MSI
967 printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
968 pci_name(dev2), dev2->irq, irq);
975 printk(KERN_INFO "PCI: Sharing IRQ %d with %s\n", irq, pci_name(dev2));
981 static void __init pcibios_fixup_irqs(void)
983 struct pci_dev *dev = NULL;
986 DBG(KERN_DEBUG "PCI: IRQ fixup\n");
987 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
989 * If the BIOS has set an out of range IRQ number, just ignore it.
990 * Also keep track of which IRQ's are already in use.
992 if (dev->irq >= 16) {
993 DBG(KERN_DEBUG "%s: ignoring bogus IRQ %d\n", pci_name(dev), dev->irq);
996 /* If the IRQ is already assigned to a PCI device, ignore its ISA use penalty */
997 if (pirq_penalty[dev->irq] >= 100 && pirq_penalty[dev->irq] < 100000)
998 pirq_penalty[dev->irq] = 0;
999 pirq_penalty[dev->irq]++;
1003 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1004 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1005 #ifdef CONFIG_X86_IO_APIC
1007 * Recalculate IRQ numbers if we use the I/O APIC.
1009 if (io_apic_assign_pci_irqs)
1014 pin--; /* interrupt pins are numbered starting from 1 */
1015 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
1017 * Busses behind bridges are typically not listed in the MP-table.
1018 * In this case we have to look up the IRQ based on the parent bus,
1019 * parent slot, and pin number. The SMP code detects such bridged
1020 * busses itself so we should get into this branch reliably.
1022 if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1023 struct pci_dev * bridge = dev->bus->self;
1025 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1026 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1027 PCI_SLOT(bridge->devfn), pin);
1029 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
1030 pci_name(bridge), 'A' + pin, irq);
1033 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
1034 pci_name(dev), 'A' + pin, irq);
1041 * Still no IRQ? Try to lookup one...
1043 if (pin && !dev->irq)
1044 pcibios_lookup_irq(dev, 0);
1049 * Work around broken HP Pavilion Notebooks which assign USB to
1050 * IRQ 9 even though it is actually wired to IRQ 11
1052 static int __init fix_broken_hp_bios_irq9(const struct dmi_system_id *d)
1054 if (!broken_hp_bios_irq9) {
1055 broken_hp_bios_irq9 = 1;
1056 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
1062 * Work around broken Acer TravelMate 360 Notebooks which assign
1063 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
1065 static int __init fix_acer_tm360_irqrouting(const struct dmi_system_id *d)
1067 if (!acer_tm360_irqrouting) {
1068 acer_tm360_irqrouting = 1;
1069 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n", d->ident);
1074 static struct dmi_system_id __initdata pciirq_dmi_table[] = {
1076 .callback = fix_broken_hp_bios_irq9,
1077 .ident = "HP Pavilion N5400 Series Laptop",
1079 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1080 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
1081 DMI_MATCH(DMI_PRODUCT_VERSION, "HP Pavilion Notebook Model GE"),
1082 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
1086 .callback = fix_acer_tm360_irqrouting,
1087 .ident = "Acer TravelMate 36x Laptop",
1089 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1090 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1096 static int __init pcibios_irq_init(void)
1098 DBG(KERN_DEBUG "PCI: IRQ init\n");
1100 if (pcibios_enable_irq || raw_pci_ops == NULL)
1103 dmi_check_system(pciirq_dmi_table);
1105 pirq_table = pirq_find_routing_table();
1107 #ifdef CONFIG_PCI_BIOS
1108 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
1109 pirq_table = pcibios_get_irq_routing_table();
1113 pirq_find_router(&pirq_router);
1114 if (pirq_table->exclusive_irqs) {
1116 for (i=0; i<16; i++)
1117 if (!(pirq_table->exclusive_irqs & (1 << i)))
1118 pirq_penalty[i] += 100;
1120 /* If we're using the I/O APIC, avoid using the PCI IRQ routing table */
1121 if (io_apic_assign_pci_irqs)
1125 pcibios_enable_irq = pirq_enable_irq;
1127 pcibios_fixup_irqs();
1131 subsys_initcall(pcibios_irq_init);
1134 static void pirq_penalize_isa_irq(int irq, int active)
1137 * If any ISAPnP device reports an IRQ in its list of possible
1138 * IRQ's, we try to avoid assigning it to PCI devices.
1142 pirq_penalty[irq] += 1000;
1144 pirq_penalty[irq] += 100;
1148 void pcibios_penalize_isa_irq(int irq, int active)
1152 acpi_penalize_isa_irq(irq, active);
1155 pirq_penalize_isa_irq(irq, active);
1158 static int pirq_enable_irq(struct pci_dev *dev)
1161 struct pci_dev *temp_dev;
1163 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1164 if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
1167 pin--; /* interrupt pins are numbered starting from 1 */
1169 if (io_apic_assign_pci_irqs) {
1172 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
1174 * Busses behind bridges are typically not listed in the MP-table.
1175 * In this case we have to look up the IRQ based on the parent bus,
1176 * parent slot, and pin number. The SMP code detects such bridged
1177 * busses itself so we should get into this branch reliably.
1180 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1181 struct pci_dev * bridge = dev->bus->self;
1183 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1184 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1185 PCI_SLOT(bridge->devfn), pin);
1187 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
1188 pci_name(bridge), 'A' + pin, irq);
1193 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
1194 pci_name(dev), 'A' + pin, irq);
1198 msg = " Probably buggy MP table.";
1199 } else if (pci_probe & PCI_BIOS_IRQ_SCAN)
1202 msg = " Please try using pci=biosirq.";
1204 /* With IDE legacy devices the IRQ lookup failure is not a problem.. */
1205 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE && !(dev->class & 0x5))
1208 printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
1209 'A' + pin, pci_name(dev), msg);