pci-irq.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:22k
- /*
- * Low-Level PCI Support for PC -- Routing of Interrupts
- *
- * (c) 1999--2000 Martin Mares <mj@ucw.cz>
- */
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/kernel.h>
- #include <linux/pci.h>
- #include <linux/init.h>
- #include <linux/slab.h>
- #include <linux/interrupt.h>
- #include <linux/irq.h>
- #include <asm/io.h>
- #include <asm/smp.h>
- #include <asm/io_apic.h>
- #include "pci-i386.h"
- #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
- #define PIRQ_VERSION 0x0100
- int broken_hp_bios_irq9;
- static struct irq_routing_table *pirq_table;
- /*
- * Never use: 0, 1, 2 (timer, keyboard, and cascade)
- * Avoid using: 13, 14 and 15 (FP error and IDE).
- * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse)
- */
- unsigned int pcibios_irq_mask = 0xfff8;
- static int pirq_penalty[16] = {
- 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000,
- 0, 0, 0, 0, 1000, 100000, 100000, 100000
- };
- struct irq_router {
- char *name;
- u16 vendor, device;
- int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq);
- int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new);
- };
- /*
- * Search 0xf0000 -- 0xfffff for the PCI IRQ Routing Table.
- */
- static struct irq_routing_table * __init pirq_find_routing_table(void)
- {
- u8 *addr;
- struct irq_routing_table *rt;
- int i;
- u8 sum;
- for(addr = (u8 *) __va(0xf0000); addr < (u8 *) __va(0x100000); addr += 16) {
- rt = (struct irq_routing_table *) addr;
- if (rt->signature != PIRQ_SIGNATURE ||
- rt->version != PIRQ_VERSION ||
- rt->size % 16 ||
- rt->size < sizeof(struct irq_routing_table))
- continue;
- sum = 0;
- for(i=0; i<rt->size; i++)
- sum += addr[i];
- if (!sum) {
- DBG("PCI: Interrupt Routing Table found at 0x%pn", rt);
- return rt;
- }
- }
- return NULL;
- }
- /*
- * If we have a IRQ routing table, use it to search for peer host
- * bridges. It's a gross hack, but since there are no other known
- * ways how to get a list of buses, we have to go this way.
- */
- static void __init pirq_peer_trick(void)
- {
- struct irq_routing_table *rt = pirq_table;
- u8 busmap[256];
- int i;
- struct irq_info *e;
- memset(busmap, 0, sizeof(busmap));
- for(i=0; i < (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info); i++) {
- e = &rt->slots[i];
- #ifdef DEBUG
- {
- int j;
- DBG("%02x:%02x slot=%02x", e->bus, e->devfn/8, e->slot);
- for(j=0; j<4; j++)
- DBG(" %d:%02x/%04x", j, e->irq[j].link, e->irq[j].bitmap);
- DBG("n");
- }
- #endif
- busmap[e->bus] = 1;
- }
- for(i=1; i<256; i++)
- /*
- * It might be a secondary bus, but in this case its parent is already
- * known (ascending bus order) and therefore pci_scan_bus returns immediately.
- */
- if (busmap[i] && pci_scan_bus(i, pci_root_bus->ops, NULL))
- printk(KERN_INFO "PCI: Discovered primary peer bus %02x [IRQ]n", i);
- pcibios_last_bus = -1;
- }
- /*
- * Code for querying and setting of IRQ routes on various interrupt routers.
- */
- static void eisa_set_level_irq(unsigned int irq)
- {
- unsigned char mask = 1 << (irq & 7);
- unsigned int port = 0x4d0 + (irq >> 3);
- unsigned char val = inb(port);
- if (!(val & mask)) {
- DBG(" -> edge");
- outb(val | mask, port);
- }
- }
- /*
- * Common IRQ routing practice: nybbles in config space,
- * offset by some magic constant.
- */
- static unsigned int read_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr)
- {
- u8 x;
- unsigned reg = offset + (nr >> 1);
- pci_read_config_byte(router, reg, &x);
- return (nr & 1) ? (x >> 4) : (x & 0xf);
- }
- static void write_config_nybble(struct pci_dev *router, unsigned offset, unsigned nr, unsigned int val)
- {
- u8 x;
- unsigned reg = offset + (nr >> 1);
- pci_read_config_byte(router, reg, &x);
- x = (nr & 1) ? ((x & 0x0f) | (val << 4)) : ((x & 0xf0) | val);
- pci_write_config_byte(router, reg, x);
- }
- /*
- * ALI pirq entries are damn ugly, and completely undocumented.
- * This has been figured out from pirq tables, and it's not a pretty
- * picture.
- */
- static int pirq_ali_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- static unsigned char irqmap[16] = { 0, 9, 3, 10, 4, 5, 7, 6, 1, 11, 0, 12, 0, 14, 0, 15 };
- return irqmap[read_config_nybble(router, 0x48, pirq-1)];
- }
- static int pirq_ali_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- static unsigned char irqmap[16] = { 0, 8, 0, 2, 4, 5, 7, 6, 0, 1, 3, 9, 11, 0, 13, 15 };
- unsigned int val = irqmap[irq];
-
- if (val) {
- write_config_nybble(router, 0x48, pirq-1, val);
- return 1;
- }
- return 0;
- }
- /*
- * The Intel PIIX4 pirq rules are fairly simple: "pirq" is
- * just a pointer to the config space.
- */
- static int pirq_piix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- u8 x;
- pci_read_config_byte(router, pirq, &x);
- return (x < 16) ? x : 0;
- }
- static int pirq_piix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- pci_write_config_byte(router, pirq, irq);
- return 1;
- }
- /*
- * The VIA pirq rules are nibble-based, like ALI,
- * but without the ugly irq number munging.
- */
- static int pirq_via_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- return read_config_nybble(router, 0x55, pirq);
- }
- static int pirq_via_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- write_config_nybble(router, 0x55, pirq, irq);
- return 1;
- }
- /*
- * ITE 8330G pirq rules are nibble-based
- * FIXME: pirqmap may be { 1, 0, 3, 2 },
- * 2+3 are both mapped to irq 9 on my system
- */
- static int pirq_ite_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
- return read_config_nybble(router,0x43, pirqmap[pirq-1]);
- }
- static int pirq_ite_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- static unsigned char pirqmap[4] = { 1, 0, 2, 3 };
- write_config_nybble(router, 0x43, pirqmap[pirq-1], irq);
- return 1;
- }
- /*
- * OPTI: high four bits are nibble pointer..
- * I wonder what the low bits do?
- */
- static int pirq_opti_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- return read_config_nybble(router, 0xb8, pirq >> 4);
- }
- static int pirq_opti_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- write_config_nybble(router, 0xb8, pirq >> 4, irq);
- return 1;
- }
- /*
- * Cyrix: nibble offset 0x5C
- */
- static int pirq_cyrix_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- return read_config_nybble(router, 0x5C, (pirq-1)^1);
- }
- static int pirq_cyrix_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- write_config_nybble(router, 0x5C, (pirq-1)^1, irq);
- return 1;
- }
- /*
- * PIRQ routing for SiS 85C503 router used in several SiS chipsets
- * According to the SiS 5595 datasheet (preliminary V1.0, 12/24/1997)
- * the related registers work as follows:
- *
- * general: one byte per re-routable IRQ,
- * bit 7 IRQ mapping enabled (0) or disabled (1)
- * bits [6:4] reserved
- * bits [3:0] IRQ to map to
- * allowed: 3-7, 9-12, 14-15
- * reserved: 0, 1, 2, 8, 13
- *
- * individual registers in device config space:
- *
- * 0x41/0x42/0x43/0x44: PCI INT A/B/C/D - bits as in general case
- *
- * 0x61: IDEIRQ: bits as in general case - but:
- * bits [6:5] must be written 01
- * bit 4 channel-select primary (0), secondary (1)
- *
- * 0x62: USBIRQ: bits as in general case - but:
- * bit 4 OHCI function disabled (0), enabled (1)
- *
- * 0x6a: ACPI/SCI IRQ - bits as in general case
- *
- * 0x7e: Data Acq. Module IRQ - bits as in general case
- *
- * Apparently there are systems implementing PCI routing table using both
- * link values 0x01-0x04 and 0x41-0x44 for PCI INTA..D, but register offsets
- * like 0x62 as link values for USBIRQ e.g. So there is no simple
- * "register = offset + pirq" relation.
- * Currently we support PCI INTA..D and USBIRQ and try our best to handle
- * both link mappings.
- * IDE/ACPI/DAQ mapping is currently unsupported (left untouched as set by BIOS).
- */
- static int pirq_sis_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- u8 x;
- int reg = pirq;
- switch(pirq) {
- case 0x01:
- case 0x02:
- case 0x03:
- case 0x04:
- reg += 0x40;
- case 0x41:
- case 0x42:
- case 0x43:
- case 0x44:
- case 0x62:
- pci_read_config_byte(router, reg, &x);
- if (reg != 0x62)
- break;
- if (!(x & 0x40))
- return 0;
- break;
- case 0x61:
- case 0x6a:
- case 0x7e:
- printk(KERN_INFO "SiS pirq: advanced IDE/ACPI/DAQ mapping not yet implementedn");
- return 0;
- default:
- printk(KERN_INFO "SiS router pirq escape (%d)n", pirq);
- return 0;
- }
- return (x & 0x80) ? 0 : (x & 0x0f);
- }
- static int pirq_sis_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- u8 x;
- int reg = pirq;
- switch(pirq) {
- case 0x01:
- case 0x02:
- case 0x03:
- case 0x04:
- reg += 0x40;
- case 0x41:
- case 0x42:
- case 0x43:
- case 0x44:
- case 0x62:
- x = (irq&0x0f) ? (irq&0x0f) : 0x80;
- if (reg != 0x62)
- break;
- /* always mark OHCI enabled, as nothing else knows about this */
- x |= 0x40;
- break;
- case 0x61:
- case 0x6a:
- case 0x7e:
- printk(KERN_INFO "advanced SiS pirq mapping not yet implementedn");
- return 0;
- default:
- printk(KERN_INFO "SiS router pirq escape (%d)n", pirq);
- return 0;
- }
- pci_write_config_byte(router, reg, x);
- return 1;
- }
- /*
- * VLSI: nibble offset 0x74 - educated guess due to routing table and
- * config space of VLSI 82C534 PCI-bridge/router (1004:0102)
- * Tested on HP OmniBook 800 covering PIRQ 1, 2, 4, 8 for onboard
- * devices, PIRQ 3 for non-pci(!) soundchip and (untested) PIRQ 6
- * for the busbridge to the docking station.
- */
- static int pirq_vlsi_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- if (pirq > 8) {
- printk(KERN_INFO "VLSI router pirq escape (%d)n", pirq);
- return 0;
- }
- return read_config_nybble(router, 0x74, pirq-1);
- }
- static int pirq_vlsi_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- if (pirq > 8) {
- printk(KERN_INFO "VLSI router pirq escape (%d)n", pirq);
- return 0;
- }
- write_config_nybble(router, 0x74, pirq-1, irq);
- return 1;
- }
- /*
- * ServerWorks: PCI interrupts mapped to system IRQ lines through Index
- * and Redirect I/O registers (0x0c00 and 0x0c01). The Index register
- * format is (PCIIRQ## | 0x10), e.g.: PCIIRQ10=0x1a. The Redirect
- * register is a straight binary coding of desired PIC IRQ (low nibble).
- *
- * The 'link' value in the PIRQ table is already in the correct format
- * for the Index register. There are some special index values:
- * 0x00 for ACPI (SCI), 0x01 for USB, 0x02 for IDE0, 0x04 for IDE1,
- * and 0x03 for SMBus.
- */
- static int pirq_serverworks_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- outb_p(pirq, 0xc00);
- return inb(0xc01) & 0xf;
- }
- static int pirq_serverworks_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- outb_p(pirq, 0xc00);
- outb_p(irq, 0xc01);
- return 1;
- }
- /* Support for AMD756 PCI IRQ Routing
- * Jhon H. Caicedo <jhcaiced@osso.org.co>
- * Jun/21/2001 0.2.0 Release, fixed to use "nybble" functions... (jhcaiced)
- * Jun/19/2001 Alpha Release 0.1.0 (jhcaiced)
- * The AMD756 pirq rules are nibble-based
- * offset 0x56 0-3 PIRQA 4-7 PIRQB
- * offset 0x57 0-3 PIRQC 4-7 PIRQD
- */
- static int pirq_amd756_get(struct pci_dev *router, struct pci_dev *dev, int pirq)
- {
- u8 irq;
- irq = 0;
- if (pirq <= 4)
- {
- irq = read_config_nybble(router, 0x56, pirq - 1);
- }
- printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d get irq : %2dn",
- dev->vendor, dev->device, pirq, irq);
- return irq;
- }
- static int pirq_amd756_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- printk(KERN_INFO "AMD756: dev %04x:%04x, router pirq : %d SET irq : %2dn",
- dev->vendor, dev->device, pirq, irq);
- if (pirq <= 4)
- {
- write_config_nybble(router, 0x56, pirq - 1, irq);
- }
- return 1;
- }
- #ifdef CONFIG_PCI_BIOS
- static int pirq_bios_set(struct pci_dev *router, struct pci_dev *dev, int pirq, int irq)
- {
- struct pci_dev *bridge;
- int pin = pci_get_interrupt_pin(dev, &bridge);
- return pcibios_set_irq_routing(bridge, pin, irq);
- }
- static struct irq_router pirq_bios_router =
- { "BIOS", 0, 0, NULL, pirq_bios_set };
- #endif
- static struct irq_router pirq_routers[] = {
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371FB_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371MX, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AA_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801AB_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_10, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0, pirq_piix_get, pirq_piix_set },
- { "PIIX", PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801E_0, pirq_piix_get, pirq_piix_set },
- { "ALI", PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1533, pirq_ali_get, pirq_ali_set },
- { "ITE", PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_IT8330G_0, pirq_ite_get, pirq_ite_set },
- { "VIA", PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_0, pirq_via_get, pirq_via_set },
- { "VIA", PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596, pirq_via_get, pirq_via_set },
- { "VIA", PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686, pirq_via_get, pirq_via_set },
- { "OPTI", PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C700, pirq_opti_get, pirq_opti_set },
- { "NatSemi", PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520, pirq_cyrix_get, pirq_cyrix_set },
- { "SIS", PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503, pirq_sis_get, pirq_sis_set },
- { "VLSI 82C534", PCI_VENDOR_ID_VLSI, PCI_DEVICE_ID_VLSI_82C534, pirq_vlsi_get, pirq_vlsi_set },
- { "ServerWorks", PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4,
- pirq_serverworks_get, pirq_serverworks_set },
- { "ServerWorks", PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5,
- pirq_serverworks_get, pirq_serverworks_set },
- { "AMD756 VIPER", PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B,
- pirq_amd756_get, pirq_amd756_set },
- { "AMD766", PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413,
- pirq_amd756_get, pirq_amd756_set },
- { "AMD768", PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7443,
- pirq_amd756_get, pirq_amd756_set },
- { "default", 0, 0, NULL, NULL }
- };
- static struct irq_router *pirq_router;
- static struct pci_dev *pirq_router_dev;
- static void __init pirq_find_router(void)
- {
- struct irq_routing_table *rt = pirq_table;
- struct irq_router *r;
- #ifdef CONFIG_PCI_BIOS
- if (!rt->signature) {
- printk(KERN_INFO "PCI: Using BIOS for IRQ routingn");
- pirq_router = &pirq_bios_router;
- return;
- }
- #endif
- DBG("PCI: Attempting to find IRQ router for %04x:%04xn",
- rt->rtr_vendor, rt->rtr_device);
- /* fall back to default router if nothing else found */
- pirq_router = &pirq_routers[ARRAY_SIZE(pirq_routers) - 1];
- pirq_router_dev = pci_find_slot(rt->rtr_bus, rt->rtr_devfn);
- if (!pirq_router_dev) {
- DBG("PCI: Interrupt router not found at %02x:%02xn", rt->rtr_bus, rt->rtr_devfn);
- return;
- }
- for(r=pirq_routers; r->vendor; r++) {
- /* Exact match against router table entry? Use it! */
- if (r->vendor == rt->rtr_vendor && r->device == rt->rtr_device) {
- pirq_router = r;
- break;
- }
- /* Match against router device entry? Use it as a fallback */
- if (r->vendor == pirq_router_dev->vendor && r->device == pirq_router_dev->device) {
- pirq_router = r;
- }
- }
- printk(KERN_INFO "PCI: Using IRQ router %s [%04x/%04x] at %sn",
- pirq_router->name,
- pirq_router_dev->vendor,
- pirq_router_dev->device,
- pirq_router_dev->slot_name);
- }
- static struct irq_info *pirq_get_info(struct pci_dev *dev)
- {
- struct irq_routing_table *rt = pirq_table;
- int entries = (rt->size - sizeof(struct irq_routing_table)) / sizeof(struct irq_info);
- struct irq_info *info;
- for (info = rt->slots; entries--; info++)
- if (info->bus == dev->bus->number && PCI_SLOT(info->devfn) == PCI_SLOT(dev->devfn))
- return info;
- return NULL;
- }
- static void pcibios_test_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
- {
- }
- static int pcibios_lookup_irq(struct pci_dev *dev, int assign)
- {
- u8 pin;
- struct irq_info *info;
- int i, pirq, newirq;
- int irq = 0;
- u32 mask;
- struct irq_router *r = pirq_router;
- struct pci_dev *dev2;
- char *msg = NULL;
- if (!pirq_table)
- return 0;
- /* Find IRQ routing entry */
- pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
- if (!pin) {
- DBG(" -> no interrupt pinn");
- return 0;
- }
- pin = pin - 1;
-
- DBG("IRQ for %s:%d", dev->slot_name, pin);
- info = pirq_get_info(dev);
- if (!info) {
- DBG(" -> not found in routing tablen");
- return 0;
- }
- pirq = info->irq[pin].link;
- mask = info->irq[pin].bitmap;
- if (!pirq) {
- DBG(" -> not routedn");
- return 0;
- }
- DBG(" -> PIRQ %02x, mask %04x, excl %04x", pirq, mask, pirq_table->exclusive_irqs);
- mask &= pcibios_irq_mask;
- /* Work around broken HP Pavilion Notebooks which assign USB to
- IRQ 9 even though it is actually wired to IRQ 11 */
- if (broken_hp_bios_irq9 && pirq == 0x59 && dev->irq == 9) {
- dev->irq = 11;
- pci_write_config_byte(dev, PCI_INTERRUPT_LINE, 11);
- r->set(pirq_router_dev, dev, pirq, 11);
- }
- /*
- * Find the best IRQ to assign: use the one
- * reported by the device if possible.
- */
- newirq = dev->irq;
- if (!newirq && assign) {
- for (i = 0; i < 16; i++) {
- if (!(mask & (1 << i)))
- continue;
- if (pirq_penalty[i] < pirq_penalty[newirq] &&
- !request_irq(i, pcibios_test_irq_handler, SA_SHIRQ, "pci-test", dev)) {
- free_irq(i, dev);
- newirq = i;
- }
- }
- }
- DBG(" -> newirq=%d", newirq);
- /* Check if it is hardcoded */
- if ((pirq & 0xf0) == 0xf0) {
- irq = pirq & 0xf;
- DBG(" -> hardcoded IRQ %dn", irq);
- msg = "Hardcoded";
- } else if (r->get && (irq = r->get(pirq_router_dev, dev, pirq))) {
- DBG(" -> got IRQ %dn", irq);
- msg = "Found";
- } else if (newirq && r->set && (dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) {
- DBG(" -> assigning IRQ %d", newirq);
- if (r->set(pirq_router_dev, dev, pirq, newirq)) {
- eisa_set_level_irq(newirq);
- DBG(" ... OKn");
- msg = "Assigned";
- irq = newirq;
- }
- }
- if (!irq) {
- DBG(" ... failedn");
- if (newirq && mask == (1 << newirq)) {
- msg = "Guessed";
- irq = newirq;
- } else
- return 0;
- }
- printk(KERN_INFO "PCI: %s IRQ %d for device %sn", msg, irq, dev->slot_name);
- /* Update IRQ for all devices with the same pirq value */
- pci_for_each_dev(dev2) {
- pci_read_config_byte(dev2, PCI_INTERRUPT_PIN, &pin);
- if (!pin)
- continue;
- pin--;
- info = pirq_get_info(dev2);
- if (!info)
- continue;
- if (info->irq[pin].link == pirq) {
- /* We refuse to override the dev->irq information. Give a warning! */
- if (dev2->irq && dev2->irq != irq) {
- printk(KERN_INFO "IRQ routing conflict for %s, have irq %d, want irq %dn",
- dev2->slot_name, dev2->irq, irq);
- continue;
- }
- dev2->irq = irq;
- pirq_penalty[irq]++;
- if (dev != dev2)
- printk(KERN_INFO "PCI: Sharing IRQ %d with %sn", irq, dev2->slot_name);
- }
- }
- return 1;
- }
- void __init pcibios_irq_init(void)
- {
- DBG("PCI: IRQ initn");
- pirq_table = pirq_find_routing_table();
- #ifdef CONFIG_PCI_BIOS
- if (!pirq_table && (pci_probe & PCI_BIOS_IRQ_SCAN))
- pirq_table = pcibios_get_irq_routing_table();
- #endif
- if (pirq_table) {
- pirq_peer_trick();
- pirq_find_router();
- if (pirq_table->exclusive_irqs) {
- int i;
- for (i=0; i<16; i++)
- if (!(pirq_table->exclusive_irqs & (1 << i)))
- pirq_penalty[i] += 100;
- }
- /* If we're using the I/O APIC, avoid using the PCI IRQ routing table */
- if (io_apic_assign_pci_irqs)
- pirq_table = NULL;
- }
- }
- void __init pcibios_fixup_irqs(void)
- {
- struct pci_dev *dev;
- u8 pin;
- DBG("PCI: IRQ fixupn");
- pci_for_each_dev(dev) {
- /*
- * If the BIOS has set an out of range IRQ number, just ignore it.
- * Also keep track of which IRQ's are already in use.
- */
- if (dev->irq >= 16) {
- DBG("%s: ignoring bogus IRQ %dn", dev->slot_name, dev->irq);
- dev->irq = 0;
- }
- /* If the IRQ is already assigned to a PCI device, ignore its ISA use penalty */
- if (pirq_penalty[dev->irq] >= 100 && pirq_penalty[dev->irq] < 100000)
- pirq_penalty[dev->irq] = 0;
- pirq_penalty[dev->irq]++;
- }
- pci_for_each_dev(dev) {
- pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
- #ifdef CONFIG_X86_IO_APIC
- /*
- * Recalculate IRQ numbers if we use the I/O APIC.
- */
- if (io_apic_assign_pci_irqs)
- {
- int irq;
- if (pin) {
- pin--; /* interrupt pins are numbered starting from 1 */
- irq = IO_APIC_get_PCI_irq_vector(dev->bus->number, PCI_SLOT(dev->devfn), pin);
- /*
- * Busses behind bridges are typically not listed in the MP-table.
- * In this case we have to look up the IRQ based on the parent bus,
- * parent slot, and pin number. The SMP code detects such bridged
- * busses itself so we should get into this branch reliably.
- */
- if (irq < 0 && dev->bus->parent) { /* go back to the bridge */
- struct pci_dev * bridge = dev->bus->self;
- pin = (pin + PCI_SLOT(dev->devfn)) % 4;
- irq = IO_APIC_get_PCI_irq_vector(bridge->bus->number,
- PCI_SLOT(bridge->devfn), pin);
- if (irq >= 0)
- printk(KERN_WARNING "PCI: using PPB(B%d,I%d,P%d) to get irq %dn",
- bridge->bus->number, PCI_SLOT(bridge->devfn), pin, irq);
- }
- if (irq >= 0) {
- printk(KERN_INFO "PCI->APIC IRQ transform: (B%d,I%d,P%d) -> %dn",
- dev->bus->number, PCI_SLOT(dev->devfn), pin, irq);
- dev->irq = irq;
- }
- }
- }
- #endif
- /*
- * Still no IRQ? Try to lookup one...
- */
- if (pin && !dev->irq)
- pcibios_lookup_irq(dev, 0);
- }
- }
- void pcibios_penalize_isa_irq(int irq)
- {
- /*
- * If any ISAPnP device reports an IRQ in its list of possible
- * IRQ's, we try to avoid assigning it to PCI devices.
- */
- pirq_penalty[irq] += 100;
- }
- void pcibios_enable_irq(struct pci_dev *dev)
- {
- u8 pin;
- pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
- if (pin && !pcibios_lookup_irq(dev, 1) && !dev->irq) {
- char *msg;
- if (io_apic_assign_pci_irqs)
- msg = " Probably buggy MP table.";
- else if (pci_probe & PCI_BIOS_IRQ_SCAN)
- msg = "";
- else
- msg = " Please try using pci=biosirq.";
- printk(KERN_WARNING "PCI: No IRQ known for interrupt pin %c of device %s.%sn",
- 'A' + pin - 1, dev->slot_name, msg);
- }
- }