diff options
Diffstat (limited to 'arch/tile/include/asm/irq.h')
| -rw-r--r-- | arch/tile/include/asm/irq.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/tile/include/asm/irq.h b/arch/tile/include/asm/irq.h new file mode 100644 index 000000000000..572fd3ef1d73 --- /dev/null +++ b/arch/tile/include/asm/irq.h | |||
| @@ -0,0 +1,87 @@ | |||
| 1 | /* | ||
| 2 | * Copyright 2010 Tilera Corporation. All Rights Reserved. | ||
| 3 | * | ||
| 4 | * This program is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU General Public License | ||
| 6 | * as published by the Free Software Foundation, version 2. | ||
| 7 | * | ||
| 8 | * This program is distributed in the hope that it will be useful, but | ||
| 9 | * WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 10 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | ||
| 11 | * NON INFRINGEMENT. See the GNU General Public License for | ||
| 12 | * more details. | ||
| 13 | */ | ||
| 14 | |||
| 15 | #ifndef _ASM_TILE_IRQ_H | ||
| 16 | #define _ASM_TILE_IRQ_H | ||
| 17 | |||
| 18 | #include <linux/hardirq.h> | ||
| 19 | |||
| 20 | /* The hypervisor interface provides 32 IRQs. */ | ||
| 21 | #define NR_IRQS 32 | ||
| 22 | |||
| 23 | /* IRQ numbers used for linux IPIs. */ | ||
| 24 | #define IRQ_RESCHEDULE 1 | ||
| 25 | |||
| 26 | void ack_bad_irq(unsigned int irq); | ||
| 27 | |||
| 28 | /* | ||
| 29 | * Different ways of handling interrupts. Tile interrupts are always | ||
| 30 | * per-cpu; there is no global interrupt controller to implement | ||
| 31 | * enable/disable. Most onboard devices can send their interrupts to | ||
| 32 | * many tiles at the same time, and Tile-specific drivers know how to | ||
| 33 | * deal with this. | ||
| 34 | * | ||
| 35 | * However, generic devices (usually PCIE based, sometimes GPIO) | ||
| 36 | * expect that interrupts will fire on a single core at a time and | ||
| 37 | * that the irq can be enabled or disabled from any core at any time. | ||
| 38 | * We implement this by directing such interrupts to a single core. | ||
| 39 | * | ||
| 40 | * One added wrinkle is that PCI interrupts can be either | ||
| 41 | * hardware-cleared (legacy interrupts) or software cleared (MSI). | ||
| 42 | * Other generic device systems (GPIO) are always software-cleared. | ||
| 43 | * | ||
| 44 | * The enums below are used by drivers for onboard devices, including | ||
| 45 | * the internals of PCI root complex and GPIO. They allow the driver | ||
| 46 | * to tell the generic irq code what kind of interrupt is mapped to a | ||
| 47 | * particular IRQ number. | ||
| 48 | */ | ||
| 49 | enum { | ||
| 50 | /* per-cpu interrupt; use enable/disable_percpu_irq() to mask */ | ||
| 51 | TILE_IRQ_PERCPU, | ||
| 52 | /* global interrupt, hardware responsible for clearing. */ | ||
| 53 | TILE_IRQ_HW_CLEAR, | ||
| 54 | /* global interrupt, software responsible for clearing. */ | ||
| 55 | TILE_IRQ_SW_CLEAR, | ||
| 56 | }; | ||
| 57 | |||
| 58 | |||
| 59 | /* | ||
| 60 | * Paravirtualized drivers should call this when they dynamically | ||
| 61 | * allocate a new IRQ or discover an IRQ that was pre-allocated by the | ||
| 62 | * hypervisor for use with their particular device. This gives the | ||
| 63 | * IRQ subsystem an opportunity to do interrupt-type-specific | ||
| 64 | * initialization. | ||
| 65 | * | ||
| 66 | * ISSUE: We should modify this API so that registering anything | ||
| 67 | * except percpu interrupts also requires providing callback methods | ||
| 68 | * for enabling and disabling the interrupt. This would allow the | ||
| 69 | * generic IRQ code to proxy enable/disable_irq() calls back into the | ||
| 70 | * PCI subsystem, which in turn could enable or disable the interrupt | ||
| 71 | * at the PCI shim. | ||
| 72 | */ | ||
| 73 | void tile_irq_activate(unsigned int irq, int tile_irq_type); | ||
| 74 | |||
| 75 | /* | ||
| 76 | * For onboard, non-PCI (e.g. TILE_IRQ_PERCPU) devices, drivers know | ||
| 77 | * how to use enable/disable_percpu_irq() to manage interrupts on each | ||
| 78 | * core. We can't use the generic enable/disable_irq() because they | ||
| 79 | * use a single reference count per irq, rather than per cpu per irq. | ||
| 80 | */ | ||
| 81 | void enable_percpu_irq(unsigned int irq); | ||
| 82 | void disable_percpu_irq(unsigned int irq); | ||
| 83 | |||
| 84 | |||
| 85 | void setup_irq_regs(void); | ||
| 86 | |||
| 87 | #endif /* _ASM_TILE_IRQ_H */ | ||