projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * Low-Level PCI Support for PC -- Routing of Interrupts | |
| 3 | * | |
| 4 | * (c) 1999--2000 Martin Mares <mj@ucw.cz> | |
| 5 | */ | |
| 6 | ||
| 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> | |
| 1da177e4 LT |
14 | #include <linux/dmi.h> |
| 15 | #include <asm/io.h> | |
| 16 | #include <asm/smp.h> | |
| 17 | #include <asm/io_apic.h> | |
| b33fa1f3 | 18 | #include <linux/irq.h> |
| 1da177e4 LT |
19 | #include <linux/acpi.h> |
| 20 | ||
| 21 | #include "pci.h" | |
| 22 | ||
| 23 | #define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24)) | |
| 24 | #define PIRQ_VERSION 0x0100 | |
| 25 | ||
| 26 | static int broken_hp_bios_irq9; | |
| 27 | static int acer_tm360_irqrouting; | |
| 28 | ||
| 29 | static struct irq_routing_table *pirq_table; | |
| 30 | ||
| 31 | static int pirq_enable_irq(struct pci_dev *dev); | |
| 32 | ||
| 33 | /* | |
| 34 | * Never use: 0, 1, 2 (timer, keyboard, and cascade) | |
| 35 | * Avoid using: 13, 14 and 15 (FP error and IDE). | |
| 36 | * Penalize: 3, 4, 6, 7, 12 (known ISA uses: serial, floppy, parallel and mouse) | |
| 37 | */ | |
| 38 | unsigned int pcibios_irq_mask = 0xfff8; | |
| 39 | ||
| 40 | static int pirq_penalty[16] = { | |
| 41 | 1000000, 1000000, 1000000, 1000, 1000, 0, 1000, 1000, | |
| 42 | 0, 0, 0, 0, 1000, 100000, 100000, 100000 | |
| 43 | }; | |
| 44 | ||
| 45 | struct irq_router { | |
| 46 | char *name; | |
| 47 | u16 vendor, device; | |
| 48 | int (*get)(struct pci_dev *router, struct pci_dev *dev, int pirq); | |
| 49 | int (*set)(struct pci_dev *router, struct pci_dev *dev, int pirq, int new); | |
| 50 | }; | |
| 51 | ||
| 52 | struct irq_router_handler { | |
| 53 | u16 vendor; | |
| 54 | int (*probe)(struct irq_router *r, struct pci_dev *router, u16 device); | |
| 55 | }; | |
| 56 | ||
| 57 | int (*pcibios_enable_irq)(struct pci_dev *dev) = NULL; | |
| 87bec66b | 58 | void (*pcibios_disable_irq)(struct pci_dev *dev) = NULL; |
| 1da177e4 | 59 | |
| 120bb424 | 60 | /* |
| 61 | * Check passed address for the PCI IRQ Routing Table signature | |
| 62 | * and perform checksum verification. | |
| 63 | */ | |
| 64 | ||
| 65 | static inline struct irq_routing_table * pirq_check_routing_table(u8 *addr) | |
| 66 | { | |
| 67 | struct irq_routing_table *rt; | |
| 68 | int i; | |
| 69 | u8 sum; | |
| 70 | ||
| 71 | rt = (struct irq_routing_table *) addr; | |
| 72 | if (rt->signature != PIRQ_SIGNATURE || | |
| 73 | rt->version != PIRQ_VERSION || | |
| 74 | rt->size % 16 || | |
| 75 | rt->size < sizeof(struct irq_routing_table)) | |
| 76 | return NULL; | |
| 77 | sum = 0; | |
| 78 | for (i=0; i < rt->size; i++) | |
| 79 | sum += addr[i]; | |
| 80 | if (!sum) { | |