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>
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,
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",
91 * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
94 static struct irq_routing_table * __init pirq_find_routing_table(void)
97 struct irq_routing_table *rt;
99 if (pirq_table_addr) {
100 rt = pirq_check_routing_table((u8 *) __va(pirq_table_addr));
103 printk(KERN_WARNING "PCI: PIRQ table NOT found at pirqaddr\n");
105 for (addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
106 rt = pirq_check_routing_table(addr);
114 * If we have a IRQ routing table, use it to search for peer host
115 * bridges. It's a gross hack, but since there are no other known
116 * ways how to get a list of buses, we have to go this way.
119 static void __init pirq_peer_trick(void)
121 struct irq_routing_table *rt = pirq_table;
126 memset(busmap, 0, sizeof(busmap));
127 for (i = 0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
132 DBG(KERN_DEBUG "%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
133 for (j = 0; j < 4; j++)
134 DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
140 for (i = 1; i < 256; i++) {
142 if (!busmap[i] || pci_find_bus(0, i))
144 node = get_mp_bus_to_node(i);
145 if (pci_scan_bus_on_node(i, &pci_root_ops, node))
146 printk(KERN_INFO "PCI: Discovered primary peer "
147 "bus %02x [IRQ]\n", i);
149 pcibios_last_bus = -1;
153 * Code for querying and setting of IRQ routes on various interrupt routers.
156 void eisa_set_level_irq(unsigned int irq)
158 unsigned char mask = 1 << (irq & 7);
159 unsigned int port = 0x4d0 + (irq >> 3);
161 static u16 eisa_irq_mask;
163 if (irq >= 16 || (1 << irq) & eisa_irq_mask)
166 eisa_irq_mask |= (1 << irq);
167 printk(KERN_DEBUG "PCI: setting IRQ %u as level-triggered\n", irq);
170 DBG(KERN_DEBUG " -> edge");
171 outb(val | mask, port);
176 * Common IRQ routing practice: nibbles in config space,
177 * offset by some magic constant.
179 static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
182 unsigned reg = offset + (nr >> 1);
184 pci_read_config_byte(router, reg, &x);
185 return (nr & 1) ? (x >> 4) : (x & 0xf);
188 static void write_config_nybble(struct pci_dev *router, unsigned offset,
189 unsigned nr, unsigned int val)
192 unsigned reg = offset + (nr >> 1);
194 pci_read_config_byte(router, reg, &x);
195 x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
196 pci_write_config_byte(router, reg, x);
200 * ALI pirq entries are damn ugly, and completely undocumented.
201 * This has been figured out from pirq tables, and it's not a pretty
204 static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
206 static const unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
208 WARN_ON_ONCE(pirq > 16);
209 return irqmap[read_config_nybble(router, 0x48, pirq-1)];
212 static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
214 static const unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
215 unsigned int val = irqmap[irq];
217 WARN_ON_ONCE(pirq > 16);
219 write_config_nybble(router, 0x48, pirq-1, val);
226 * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
227 * just a pointer to the config space.
229 static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
233 pci_read_config_byte(router, pirq, &x);
234 return (x < 16) ? x : 0;
237 static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
239 pci_write_config_byte(router, pirq, irq);
244 * The VIA pirq rules are nibble-based, like ALI,
245 * but without the ugly irq number munging.
246 * However, PIRQD is in the upper instead of lower 4 bits.
248 static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
250 return read_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq);
253 static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
255 write_config_nybble(router, 0x55, pirq == 4 ? 5 : pirq, irq);
260 * The VIA pirq rules are nibble-based, like ALI,
261 * but without the ugly irq number munging.
262 * However, for 82C586, nibble map is different .
264 static int pirq_via586_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
266 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
268 WARN_ON_ONCE(pirq > 5);
269 return read_config_nybble(router, 0x55, pirqmap[pirq-1]);
272 static int pirq_via586_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
274 static const unsigned int pirqmap[5] = { 3, 2, 5, 1, 1 };
276 WARN_ON_ONCE(pirq > 5);
277 write_config_nybble(router, 0x55, pirqmap[pirq-1], irq);
282 * ITE 8330G pirq rules are nibble-based
283 * FIXME: pirqmap may be { 1, 0, 3, 2 },
284 * 2+3 are both mapped to irq 9 on my system
286 static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
288 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
290 WARN_ON_ONCE(pirq > 4);
291 return read_config_nybble(router, 0x43, pirqmap[pirq-1]);
294 static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
296 static const unsigned char pirqmap[4] = { 1, 0, 2, 3 };
298 WARN_ON_ONCE(pirq > 4);
299 write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
304 * OPTI: high four bits are nibble pointer..
305 * I wonder what the low bits do?
307 static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
309 return read_config_nybble(router, 0xb8, pirq >> 4);
312 static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
314 write_config_nybble(router, 0xb8, pirq >> 4, irq);
319 * Cyrix: nibble offset 0x5C
320 * 0x5C bits 7:4 is INTB bits 3:0 is INTA
321 * 0x5D bits 7:4 is INTD bits 3:0 is INTC
323 static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
325 return read_config_nybble(router, 0x5C, (pirq-1)^1);
328 static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
330 write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
335 * PIRQ routing for SiS 85C503 router used in several SiS chipsets.
336 * We have to deal with the following issues here:
337 * - vendors have different ideas about the meaning of link values
338 * - some onboard devices (integrated in the chipset) have special
339 * links and are thus routed differently (i.e. not via PCI INTA-INTD)
340 * - different revision of the router have a different layout for
341 * the routing registers, particularly for the onchip devices
343 * For all routing registers the common thing is we have one byte
344 * per routeable link which is defined as:
345 * bit 7 IRQ mapping enabled (0) or disabled (1)
346 * bits [6:4] reserved (sometimes used for onchip devices)
347 * bits [3:0] IRQ to map to
348 * allowed: 3-7, 9-12, 14-15
349 * reserved: 0, 1, 2, 8, 13
351 * The config-space registers located at 0x41/0x42/0x43/0x44 are
352 * always used to route the normal PCI INT A/B/C/D respectively.
353 * Apparently there are systems implementing PCI routing table using
354 * link values 0x01-0x04 and others using 0x41-0x44 for PCI INTA..D.
355 * We try our best to handle both link mappings.
357 * Currently (2003-05-21) it appears most SiS chipsets follow the
358 * definition of routing registers from the SiS-5595 southbridge.
359 * According to the SiS 5595 datasheets the revision id's of the
360 * router (ISA-bridge) should be 0x01 or 0xb0.
362 * Furthermore we've also seen lspci dumps with revision 0x00 and 0xb1.
363 * Looks like these are used in a number of SiS 5xx/6xx/7xx chipsets.
364 * They seem to work with the current routing code. However there is
365 * some concern because of the two USB-OHCI HCs (original SiS 5595
366 * had only one). YMMV.
368 * Onchip routing for router rev-id 0x01/0xb0 and probably 0x00/0xb1:
371 * bits [6:5] must be written 01
372 * bit 4 channel-select primary (0), secondary (1)
375 * bit 6 OHCI function disabled (0), enabled (1)
377 * 0x6a: ACPI/SCI IRQ: bits 4-6 reserved
379 * 0x7e: Data Acq. Module IRQ - bits 4-6 reserved
381 * We support USBIRQ (in addition to INTA-INTD) and keep the
382 * IDE, ACPI and DAQ routing untouched as set by the BIOS.
384 * Currently the only reported exception is the new SiS 65x chipset
385 * which includes the SiS 69x southbridge. Here we have the 85C503
386 * router revision 0x04 and there are changes in the register layout
387 * mostly related to the different USB HCs with USB 2.0 support.
389 * Onchip routing for router rev-id 0x04 (try-and-error observation)
391 * 0x60/0x61/0x62/0x63: 1xEHCI and 3xOHCI (companion) USB-HCs
392 * bit 6-4 are probably unused, not like 5595
395 #define PIRQ_SIS_IRQ_MASK 0x0f
396 #define PIRQ_SIS_IRQ_DISABLE 0x80
397 #define PIRQ_SIS_USB_ENABLE 0x40
399 static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
405 if (reg >= 0x01 && reg <= 0x04)
407 pci_read_config_byte(router, reg, &x);
408 return (x & PIRQ_SIS_IRQ_DISABLE) ? 0 : (x & PIRQ_SIS_IRQ_MASK);
411 static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
417 if (reg >= 0x01 && reg <= 0x04)
419 pci_read_config_byte(router, reg, &x);
420 x &= ~(PIRQ_SIS_IRQ_MASK | PIRQ_SIS_IRQ_DISABLE);
421 x |= irq ? irq: PIRQ_SIS_IRQ_DISABLE;
422 pci_write_config_byte(router, reg, x);
428 * VLSI: nibble offset 0x74 - educated guess due to routing table and
429 * config space of VLSI 82C534 PCI-bridge/router (1004:0102)
430 * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
431 * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
432 * for the busbridge to the docking station.
435 static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
437 WARN_ON_ONCE(pirq >= 9);
439 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
442 return read_config_nybble(router, 0x74, pirq-1);
445 static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
447 WARN_ON_ONCE(pirq >= 9);
449 printk(KERN_INFO "VLSI router pirq escape (%d)\n", pirq);
452 write_config_nybble(router, 0x74, pirq-1, irq);
457 * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
458 * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
459 * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
460 * register is a straight binary coding of desired PIC IRQ (low nibble).
462 * The 'link' value in the PIRQ table is already in the correct format
463 * for the Index register. There are some special index values:
464 * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
465 * and 0x03 for SMBus.
467 static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
470 return inb(0xc01) & 0xf;
473 static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev,
481 /* Support for AMD756 PCI IRQ Routing
482 * Jhon H. Caicedo <jhcaiced@osso.org.co>
483 * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
484 * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
485 * The AMD756 pirq rules are nibble-based
486 * offset 0x56 0-3 PIRQA 4-7 PIRQB
487 * offset 0x57 0-3 PIRQC 4-7 PIRQD
489 static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
494 irq = read_config_nybble(router, 0x56, pirq - 1);
495 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d get irq : %2d\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)
502 printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d SET irq : %2d\n",
503 dev->vendor, dev->device, pirq, irq);
505 write_config_nybble(router, 0x56, pirq - 1, irq);
512 static int pirq_pico_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
514 outb(0x10 + ((pirq - 1) >> 1), 0x24);
515 return ((pirq - 1) & 1) ? (inb(0x26) >> 4) : (inb(0x26) & 0xf);
518 static int pirq_pico_set(struct pci_dev *router, struct pci_dev *dev, int pirq,
522 outb(0x10 + ((pirq - 1) >> 1), 0x24);
524 x = ((pirq - 1) & 1) ? ((x & 0x0f) | (irq << 4)) : ((x & 0xf0) | (irq));
529 #ifdef CONFIG_PCI_BIOS
531 static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
533 struct pci_dev *bridge;
534 int pin = pci_get_interrupt_pin(dev, &bridge);
535 return pcibios_set_irq_routing(bridge, pin, irq);
540 static __init int intel_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
542 static struct pci_device_id __initdata pirq_440gx[] = {
543 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_0) },
544 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443GX_2) },
548 /* 440GX has a proprietary PIRQ router -- don't use it */
549 if (pci_dev_present(pirq_440gx))
553 case PCI_DEVICE_ID_INTEL_82371FB_0:
554 case PCI_DEVICE_ID_INTEL_82371SB_0:
555 case PCI_DEVICE_ID_INTEL_82371AB_0:
556 case PCI_DEVICE_ID_INTEL_82371MX:
557 case PCI_DEVICE_ID_INTEL_82443MX_0:
558 case PCI_DEVICE_ID_INTEL_82801AA_0:
559 case PCI_DEVICE_ID_INTEL_82801AB_0:
560 case PCI_DEVICE_ID_INTEL_82801BA_0:
561 case PCI_DEVICE_ID_INTEL_82801BA_10:
562 case PCI_DEVICE_ID_INTEL_82801CA_0:
563 case PCI_DEVICE_ID_INTEL_82801CA_12:
564 case PCI_DEVICE_ID_INTEL_82801DB_0:
565 case PCI_DEVICE_ID_INTEL_82801E_0:
566 case PCI_DEVICE_ID_INTEL_82801EB_0:
567 case PCI_DEVICE_ID_INTEL_ESB_1:
568 case PCI_DEVICE_ID_INTEL_ICH6_0:
569 case PCI_DEVICE_ID_INTEL_ICH6_1:
570 case PCI_DEVICE_ID_INTEL_ICH7_0:
571 case PCI_DEVICE_ID_INTEL_ICH7_1:
572 case PCI_DEVICE_ID_INTEL_ICH7_30:
573 case PCI_DEVICE_ID_INTEL_ICH7_31:
574 case PCI_DEVICE_ID_INTEL_ESB2_0:
575 case PCI_DEVICE_ID_INTEL_ICH8_0:
576 case PCI_DEVICE_ID_INTEL_ICH8_1:
577 case PCI_DEVICE_ID_INTEL_ICH8_2:
578 case PCI_DEVICE_ID_INTEL_ICH8_3:
579 case PCI_DEVICE_ID_INTEL_ICH8_4:
580 case PCI_DEVICE_ID_INTEL_ICH9_0:
581 case PCI_DEVICE_ID_INTEL_ICH9_1:
582 case PCI_DEVICE_ID_INTEL_ICH9_2:
583 case PCI_DEVICE_ID_INTEL_ICH9_3:
584 case PCI_DEVICE_ID_INTEL_ICH9_4:
585 case PCI_DEVICE_ID_INTEL_ICH9_5:
586 case PCI_DEVICE_ID_INTEL_TOLAPAI_0:
587 case PCI_DEVICE_ID_INTEL_ICH10_0:
588 case PCI_DEVICE_ID_INTEL_ICH10_1:
589 case PCI_DEVICE_ID_INTEL_ICH10_2:
590 case PCI_DEVICE_ID_INTEL_ICH10_3:
591 r->name = "PIIX/ICH";
592 r->get = pirq_piix_get;
593 r->set = pirq_piix_set;
599 static __init int via_router_probe(struct irq_router *r,
600 struct pci_dev *router, u16 device)
602 /* FIXME: We should move some of the quirk fixup stuff here */
605 * workarounds for some buggy BIOSes
607 if (device == PCI_DEVICE_ID_VIA_82C586_0) {
608 switch (router->device) {
609 case PCI_DEVICE_ID_VIA_82C686:
611 * Asus k7m bios wrongly reports 82C686A
614 device = PCI_DEVICE_ID_VIA_82C686;
616 case PCI_DEVICE_ID_VIA_8235:
618 * Asus a7v-x bios wrongly reports 8235
621 device = PCI_DEVICE_ID_VIA_8235;
623 case PCI_DEVICE_ID_VIA_8237:
625 * Asus a7v600 bios wrongly reports 8237
628 device = PCI_DEVICE_ID_VIA_8237;
634 case PCI_DEVICE_ID_VIA_82C586_0:
636 r->get = pirq_via586_get;
637 r->set = pirq_via586_set;
639 case PCI_DEVICE_ID_VIA_82C596:
640 case PCI_DEVICE_ID_VIA_82C686:
641 case PCI_DEVICE_ID_VIA_8231:
642 case PCI_DEVICE_ID_VIA_8233A:
643 case PCI_DEVICE_ID_VIA_8235:
644 case PCI_DEVICE_ID_VIA_8237:
645 /* FIXME: add new ones for 8233/5 */
647 r->get = pirq_via_get;
648 r->set = pirq_via_set;
654 static __init int vlsi_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
657 case PCI_DEVICE_ID_VLSI_82C534:
658 r->name = "VLSI 82C534";
659 r->get = pirq_vlsi_get;
660 r->set = pirq_vlsi_set;
667 static __init int serverworks_router_probe(struct irq_router *r,
668 struct pci_dev *router, u16 device)
671 case PCI_DEVICE_ID_SERVERWORKS_OSB4:
672 case PCI_DEVICE_ID_SERVERWORKS_CSB5:
673 r->name = "ServerWorks";
674 r->get = pirq_serverworks_get;
675 r->set = pirq_serverworks_set;
681 static __init int sis_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
683 if (device != PCI_DEVICE_ID_SI_503)
687 r->get = pirq_sis_get;
688 r->set = pirq_sis_set;
692 static __init int cyrix_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
695 case PCI_DEVICE_ID_CYRIX_5520:
697 r->get = pirq_cyrix_get;
698 r->set = pirq_cyrix_set;
704 static __init int opti_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
707 case PCI_DEVICE_ID_OPTI_82C700:
709 r->get = pirq_opti_get;
710 r->set = pirq_opti_set;
716 static __init int ite_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
719 case PCI_DEVICE_ID_ITE_IT8330G_0:
721 r->get = pirq_ite_get;
722 r->set = pirq_ite_set;
728 static __init int ali_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
731 case PCI_DEVICE_ID_AL_M1533:
732 case PCI_DEVICE_ID_AL_M1563:
733 printk(KERN_DEBUG "PCI: Using ALI IRQ Router\n");
735 r->get = pirq_ali_get;
736 r->set = pirq_ali_set;
742 static __init int amd_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
745 case PCI_DEVICE_ID_AMD_VIPER_740B:
748 case PCI_DEVICE_ID_AMD_VIPER_7413:
751 case PCI_DEVICE_ID_AMD_VIPER_7443:
757 r->get = pirq_amd756_get;
758 r->set = pirq_amd756_set;
762 static __init int pico_router_probe(struct irq_router *r, struct pci_dev *router, u16 device)
765 case PCI_DEVICE_ID_PICOPOWER_PT86C523:
766 r->name = "PicoPower PT86C523";
767 r->get = pirq_pico_get;
768 r->set = pirq_pico_set;
771 case PCI_DEVICE_ID_PICOPOWER_PT86C523BBP:
772 r->name = "PicoPower PT86C523 rev. BB+";
773 r->get = pirq_pico_get;
774 r->set = pirq_pico_set;
780 static __initdata struct irq_router_handler pirq_routers[] = {
781 { PCI_VENDOR_ID_INTEL, intel_router_probe },
782 { PCI_VENDOR_ID_AL, ali_router_probe },
783 { PCI_VENDOR_ID_ITE, ite_router_probe },
784 { PCI_VENDOR_ID_VIA, via_router_probe },
785 { PCI_VENDOR_ID_OPTI, opti_router_probe },
786 { PCI_VENDOR_ID_SI, sis_router_probe },
787 { PCI_VENDOR_ID_CYRIX, cyrix_router_probe },
788 { PCI_VENDOR_ID_VLSI, vlsi_router_probe },
789 { PCI_VENDOR_ID_SERVERWORKS, serverworks_router_probe },
790 { PCI_VENDOR_ID_AMD, amd_router_probe },
791 { PCI_VENDOR_ID_PICOPOWER, pico_router_probe },
792 /* Someone with docs needs to add the ATI Radeon IGP */
795 static struct irq_router pirq_router;
796 static struct pci_dev *pirq_router_dev;
800 * FIXME: should we have an option to say "generic for
804 static void __init pirq_find_router(struct irq_router *r)
806 struct irq_routing_table *rt = pirq_table;
807 struct irq_router_handler *h;
809 #ifdef CONFIG_PCI_BIOS
810 if (!rt->signature) {
811 printk(KERN_INFO "PCI: Using BIOS for IRQ routing\n");
812 r->set = pirq_bios_set;
818 /* Default unless a driver reloads it */
823 DBG(KERN_DEBUG "PCI: Attempting to find IRQ router for %04x:%04x\n",
824 rt->rtr_vendor, rt->rtr_device);
826 pirq_router_dev = pci_get_bus_and_slot(rt->rtr_bus, rt->rtr_devfn);
827 if (!pirq_router_dev) {
828 DBG(KERN_DEBUG "PCI: Interrupt router not found at "
829 "%02x:%02x\n", rt->rtr_bus, rt->rtr_devfn);
833 for (h = pirq_routers; h->vendor; h++) {
834 /* First look for a router match */
835 if (rt->rtr_vendor == h->vendor &&
836 h->probe(r, pirq_router_dev, rt->rtr_device))
838 /* Fall back to a device match */
839 if (pirq_router_dev->vendor == h->vendor &&
840 h->probe(r, pirq_router_dev, pirq_router_dev->device))
843 printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %s\n",
845 pirq_router_dev->vendor,
846 pirq_router_dev->device,
847 pci_name(pirq_router_dev));
849 /* The device remains referenced for the kernel lifetime */
852 static struct irq_info *pirq_get_info(struct pci_dev *dev)
854 struct irq_routing_table *rt = pirq_table;
855 int entries = (rt->size - sizeof(struct irq_routing_table)) /
856 sizeof(struct irq_info);
857 struct irq_info *info;
859 for (info = rt->slots; entries--; info++)
860 if (info->bus == dev->bus->number &&
861 PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
866 static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
869 struct irq_info *info;
873 struct irq_router *r = &pirq_router;
874 struct pci_dev *dev2 = NULL;
878 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
880 DBG(KERN_DEBUG " -> no interrupt pin\n");
885 /* Find IRQ routing entry */
890 DBG(KERN_DEBUG "IRQ for %s[%c]", pci_name(dev), 'A' + pin);
891 info = pirq_get_info(dev);
893 DBG(" -> not found in routing table\n" KERN_DEBUG);
896 pirq = info->irq[pin].link;
897 mask = info->irq[pin].bitmap;
899 DBG(" -> not routed\n" KERN_DEBUG);
902 DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask,
903 pirq_table->exclusive_irqs);
904 mask &= pcibios_irq_mask;
906 /* Work around broken HP Pavilion Notebooks which assign USB to
907 IRQ 9 even though it is actually wired to IRQ 11 */
909 if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
911 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
912 r->set(pirq_router_dev, dev, pirq, 11);
915 /* same for Acer Travelmate 360, but with CB and irq 11 -> 10 */
916 if (acer_tm360_irqrouting && dev->irq == 11 &&
917 dev->vendor == PCI_VENDOR_ID_O2) {
920 dev->irq = r->get(pirq_router_dev, dev, pirq);
921 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
925 * Find the best IRQ to assign: use the one
926 * reported by the device if possible.
929 if (newirq && !((1 << newirq) & mask)) {
930 if (pci_probe & PCI_USE_PIRQ_MASK)
933 printk("\n" KERN_WARNING
934 "PCI: IRQ %i for device %s doesn't match PIRQ mask - try pci=usepirqmask\n"
938 if (!newirq && assign) {
939 for (i = 0; i < 16; i++) {
940 if (!(mask & (1 << i)))
942 if (pirq_penalty[i] < pirq_penalty[newirq] &&
943 can_request_irq(i, IRQF_SHARED))
947 DBG(" -> newirq=%d", newirq);
949 /* Check if it is hardcoded */
950 if ((pirq & 0xf0) == 0xf0) {
952 DBG(" -> hardcoded IRQ %d\n", irq);
954 } else if (r->get && (irq = r->get(pirq_router_dev, dev, pirq)) && \
955 ((!(pci_probe & PCI_USE_PIRQ_MASK)) || ((1 << irq) & mask))) {
956 DBG(" -> got IRQ %d\n", irq);
958 eisa_set_level_irq(irq);
959 } else if (newirq && r->set &&
960 (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
961 DBG(" -> assigning IRQ %d", newirq);
962 if (r->set(pirq_router_dev, dev, pirq, newirq)) {
963 eisa_set_level_irq(newirq);
971 DBG(" ... failed\n");
972 if (newirq && mask == (1 << newirq)) {
978 printk(KERN_INFO "PCI: %s IRQ %d for device %s\n", msg, irq,
981 /* Update IRQ for all devices with the same pirq value */
982 while ((dev2 = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev2)) != NULL) {
983 pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
987 info = pirq_get_info(dev2);
990 if (info->irq[pin].link == pirq) {
992 * We refuse to override the dev->irq
993 * information. Give a warning!
995 if (dev2->irq && dev2->irq != irq && \
996 (!(pci_probe & PCI_USE_PIRQ_MASK) || \
997 ((1 << dev2->irq) & mask))) {
998 #ifndef CONFIG_PCI_MSI
999 printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %d\n",
1000 pci_name(dev2), dev2->irq, irq);
1005 pirq_penalty[irq]++;
1008 "PCI: Sharing IRQ %d with %s\n",
1009 irq, pci_name(dev2));
1015 static void __init pcibios_fixup_irqs(void)
1017 struct pci_dev *dev = NULL;
1020 DBG(KERN_DEBUG "PCI: IRQ fixup\n");
1021 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1023 * If the BIOS has set an out of range IRQ number, just
1024 * ignore it. Also keep track of which IRQ's are
1027 if (dev->irq >= 16) {
1028 DBG(KERN_DEBUG "%s: ignoring bogus IRQ %d\n",
1029 pci_name(dev), 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);
1045 #ifdef CONFIG_X86_IO_APIC
1047 * Recalculate IRQ numbers if we use the I/O APIC.
1049 if (io_apic_assign_pci_irqs) {
1054 * interrupt pins are numbered starting
1058 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number,
1059 PCI_SLOT(dev->devfn), pin);
1061 * Busses behind bridges are typically not listed in the MP-table.
1062 * In this case we have to look up the IRQ based on the parent bus,
1063 * parent slot, and pin number. The SMP code detects such bridged
1064 * busses itself so we should get into this branch reliably.
1066 if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1067 struct pci_dev *bridge = dev->bus->self;
1069 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1070 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1071 PCI_SLOT(bridge->devfn), pin);
1073 printk(KERN_WARNING "PCI: using PPB %s[%c] to get irq %d\n",
1074 pci_name(bridge), 'A' + pin, irq);
1077 printk(KERN_INFO "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
1078 pci_name(dev), 'A' + pin, irq);
1085 * Still no IRQ? Try to lookup one...
1087 if (pin && !dev->irq)
1088 pcibios_lookup_irq(dev, 0);
1093 * Work around broken HP Pavilion Notebooks which assign USB to
1094 * IRQ 9 even though it is actually wired to IRQ 11
1096 static int __init fix_broken_hp_bios_irq9(const struct dmi_system_id *d)
1098 if (!broken_hp_bios_irq9) {
1099 broken_hp_bios_irq9 = 1;
1100 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
1107 * Work around broken Acer TravelMate 360 Notebooks which assign
1108 * Cardbus to IRQ 11 even though it is actually wired to IRQ 10
1110 static int __init fix_acer_tm360_irqrouting(const struct dmi_system_id *d)
1112 if (!acer_tm360_irqrouting) {
1113 acer_tm360_irqrouting = 1;
1114 printk(KERN_INFO "%s detected - fixing broken IRQ routing\n",
1120 static struct dmi_system_id __initdata pciirq_dmi_table[] = {
1122 .callback = fix_broken_hp_bios_irq9,
1123 .ident = "HP Pavilion N5400 Series Laptop",
1125 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
1126 DMI_MATCH(DMI_BIOS_VERSION, "GE.M1.03"),
1127 DMI_MATCH(DMI_PRODUCT_VERSION,
1128 "HP Pavilion Notebook Model GE"),
1129 DMI_MATCH(DMI_BOARD_VERSION, "OmniBook N32N-736"),
1133 .callback = fix_acer_tm360_irqrouting,
1134 .ident = "Acer TravelMate 36x Laptop",
1136 DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
1137 DMI_MATCH(DMI_PRODUCT_NAME, "TravelMate 360"),
1143 int __init pcibios_irq_init(void)
1145 DBG(KERN_DEBUG "PCI: IRQ init\n");
1147 if (pcibios_enable_irq || raw_pci_ops == NULL)
1150 dmi_check_system(pciirq_dmi_table);
1152 pirq_table = pirq_find_routing_table();
1154 #ifdef CONFIG_PCI_BIOS
1155 if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
1156 pirq_table = pcibios_get_irq_routing_table();
1160 pirq_find_router(&pirq_router);
1161 if (pirq_table->exclusive_irqs) {
1163 for (i = 0; i < 16; i++)
1164 if (!(pirq_table->exclusive_irqs & (1 << i)))
1165 pirq_penalty[i] += 100;
1168 * If we're using the I/O APIC, avoid using the PCI IRQ
1171 if (io_apic_assign_pci_irqs)
1175 pcibios_enable_irq = pirq_enable_irq;
1177 pcibios_fixup_irqs();
1181 static void pirq_penalize_isa_irq(int irq, int active)
1184 * If any ISAPnP device reports an IRQ in its list of possible
1185 * IRQ's, we try to avoid assigning it to PCI devices.
1189 pirq_penalty[irq] += 1000;
1191 pirq_penalty[irq] += 100;
1195 void pcibios_penalize_isa_irq(int irq, int active)
1199 acpi_penalize_isa_irq(irq, active);
1202 pirq_penalize_isa_irq(irq, active);
1205 static int pirq_enable_irq(struct pci_dev *dev)
1208 struct pci_dev *temp_dev;
1210 pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
1211 if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
1214 pin--; /* interrupt pins are numbered starting from 1 */
1216 if (io_apic_assign_pci_irqs) {
1219 irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
1221 * Busses behind bridges are typically not listed in the MP-table.
1222 * In this case we have to look up the IRQ based on the parent bus,
1223 * parent slot, and pin number. The SMP code detects such bridged
1224 * busses itself so we should get into this branch reliably.
1227 while (irq < 0 && dev->bus->parent) { /* go back to the bridge */
1228 struct pci_dev *bridge = dev->bus->self;
1230 pin = (pin + PCI_SLOT(dev->devfn)) % 4;
1231 irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
1232 PCI_SLOT(bridge->devfn), pin);
1235 "PCI: using PPB %s[%c] to get irq %d\n",
1243 "PCI->APIC IRQ transform: %s[%c] -> IRQ %d\n",
1244 pci_name(dev), 'A' + pin, irq);
1248 msg = " Probably buggy MP table.";
1249 } else if (pci_probe & PCI_BIOS_IRQ_SCAN)
1252 msg = " Please try using pci=biosirq.";
1255 * With IDE legacy devices the IRQ lookup failure is not
1258 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
1259 !(dev->class & 0x5))
1263 "PCI: No IRQ known for interrupt pin %c of device %s.%s\n",
1264 'A' + pin, pci_name(dev), msg);