| Mark Maule | fd58e55 | 2006-04-10 21:17:48 -0500 | [diff] [blame] | 1 | /* |
| 2 | * MSI hooks for standard x86 apic |
| 3 | */ |
| 4 | |
| 5 | #include <linux/pci.h> |
| 6 | #include <linux/irq.h> |
| 7 | |
| 8 | #include "msi.h" |
| 9 | |
| 10 | /* |
| 11 | * Shifts for APIC-based data |
| 12 | */ |
| 13 | |
| 14 | #define MSI_DATA_VECTOR_SHIFT 0 |
| 15 | #define MSI_DATA_VECTOR(v) (((u8)v) << MSI_DATA_VECTOR_SHIFT) |
| 16 | |
| 17 | #define MSI_DATA_DELIVERY_SHIFT 8 |
| 18 | #define MSI_DATA_DELIVERY_FIXED (0 << MSI_DATA_DELIVERY_SHIFT) |
| 19 | #define MSI_DATA_DELIVERY_LOWPRI (1 << MSI_DATA_DELIVERY_SHIFT) |
| 20 | |
| 21 | #define MSI_DATA_LEVEL_SHIFT 14 |
| 22 | #define MSI_DATA_LEVEL_DEASSERT (0 << MSI_DATA_LEVEL_SHIFT) |
| 23 | #define MSI_DATA_LEVEL_ASSERT (1 << MSI_DATA_LEVEL_SHIFT) |
| 24 | |
| 25 | #define MSI_DATA_TRIGGER_SHIFT 15 |
| 26 | #define MSI_DATA_TRIGGER_EDGE (0 << MSI_DATA_TRIGGER_SHIFT) |
| 27 | #define MSI_DATA_TRIGGER_LEVEL (1 << MSI_DATA_TRIGGER_SHIFT) |
| 28 | |
| 29 | /* |
| 30 | * Shift/mask fields for APIC-based bus address |
| 31 | */ |
| 32 | |
| 33 | #define MSI_ADDR_HEADER 0xfee00000 |
| 34 | |
| 35 | #define MSI_ADDR_DESTID_MASK 0xfff0000f |
| 36 | #define MSI_ADDR_DESTID_CPU(cpu) ((cpu) << MSI_TARGET_CPU_SHIFT) |
| 37 | |
| 38 | #define MSI_ADDR_DESTMODE_SHIFT 2 |
| 39 | #define MSI_ADDR_DESTMODE_PHYS (0 << MSI_ADDR_DESTMODE_SHIFT) |
| 40 | #define MSI_ADDR_DESTMODE_LOGIC (1 << MSI_ADDR_DESTMODE_SHIFT) |
| 41 | |
| 42 | #define MSI_ADDR_REDIRECTION_SHIFT 3 |
| 43 | #define MSI_ADDR_REDIRECTION_CPU (0 << MSI_ADDR_REDIRECTION_SHIFT) |
| 44 | #define MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT) |
| 45 | |
| 46 | |
| 47 | static void |
| 48 | msi_target_apic(unsigned int vector, |
| 49 | unsigned int dest_cpu, |
| 50 | u32 *address_hi, /* in/out */ |
| 51 | u32 *address_lo) /* in/out */ |
| 52 | { |
| 53 | u32 addr = *address_lo; |
| 54 | |
| 55 | addr &= MSI_ADDR_DESTID_MASK; |
| 56 | addr |= MSI_ADDR_DESTID_CPU(cpu_physical_id(dest_cpu)); |
| 57 | |
| 58 | *address_lo = addr; |
| 59 | } |
| 60 | |
| 61 | static int |
| 62 | msi_setup_apic(struct pci_dev *pdev, /* unused in generic */ |
| 63 | unsigned int vector, |
| 64 | u32 *address_hi, |
| 65 | u32 *address_lo, |
| 66 | u32 *data) |
| 67 | { |
| 68 | unsigned long dest_phys_id; |
| 69 | |
| 70 | dest_phys_id = cpu_physical_id(first_cpu(cpu_online_map)); |
| 71 | |
| 72 | *address_hi = 0; |
| 73 | *address_lo = MSI_ADDR_HEADER | |
| 74 | MSI_ADDR_DESTMODE_PHYS | |
| 75 | MSI_ADDR_REDIRECTION_CPU | |
| 76 | MSI_ADDR_DESTID_CPU(dest_phys_id); |
| 77 | |
| 78 | *data = MSI_DATA_TRIGGER_EDGE | |
| 79 | MSI_DATA_LEVEL_ASSERT | |
| 80 | MSI_DATA_DELIVERY_FIXED | |
| 81 | MSI_DATA_VECTOR(vector); |
| 82 | |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static void |
| 87 | msi_teardown_apic(unsigned int vector) |
| 88 | { |
| 89 | return; /* no-op */ |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * Generic ops used on most IA archs/platforms. Set with msi_register() |
| 94 | */ |
| 95 | |
| 96 | struct msi_ops msi_apic_ops = { |
| 97 | .setup = msi_setup_apic, |
| 98 | .teardown = msi_teardown_apic, |
| 99 | .target = msi_target_apic, |
| 100 | }; |