projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 4173a0e7 DN |
1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public | |
| 3 | * License. See the file "COPYING" in the main directory of this archive | |
| 4 | * for more details. | |
| 5 | * | |
| 6 | * SGI UV IRQ functions | |
| 7 | * | |
| 8 | * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved. | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/irq.h> | |
| 37762b6f | 13 | |
| c1eeb2de | 14 | #include <asm/genapic.h> |
| 4173a0e7 DN |
15 | #include <asm/uv/uv_irq.h> |
| 16 | ||
| 17 | static void uv_noop(unsigned int irq) | |
| 18 | { | |
| 19 | } | |
| 20 | ||
| 21 | static unsigned int uv_noop_ret(unsigned int irq) | |
| 22 | { | |
| 23 | return 0; | |
| 24 | } | |
| 25 | ||
| 26 | static void uv_ack_apic(unsigned int irq) | |
| 27 | { | |
| 28 | ack_APIC_irq(); | |
| 29 | } | |
| 30 | ||
| 31 | struct irq_chip uv_irq_chip = { | |
| 32 | .name = "UV-CORE", | |
| 33 | .startup = uv_noop_ret, | |
| 34 | .shutdown = uv_noop, | |
| 35 | .enable = uv_noop, | |
| 36 | .disable = uv_noop, | |
| 37 | .ack = uv_noop, | |
| 38 | .mask = uv_noop, | |
| 39 | .unmask = uv_noop, | |
| 40 | .eoi = uv_ack_apic, | |
| 41 | .end = uv_noop, | |
| 42 | }; | |
| 43 | ||
| 44 | /* | |
| 45 | * Set up a mapping of an available irq and vector, and enable the specified | |
| 46 | * MMR that defines the MSI that is to be sent to the specified CPU when an | |
| 47 | * interrupt is raised. | |
| 48 | */ | |
| 49 | int uv_setup_irq(char *irq_name, int cpu, int mmr_blade, | |
| 50 | unsigned long mmr_offset) | |
| 51 | { | |
| 52 | int irq; | |
| 53 | int ret; | |
| 54 | ||
| 55 | irq = create_irq(); | |
| 56 | if (irq <= 0) | |
| 57 | return -EBUSY; | |
| 58 | ||
| 59 | ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset); | |
| 60 | if (ret != irq) | |
| 61 | destroy_irq(irq); | |
| 62 | ||
| 63 | return ret; | |
| 64 | } | |
| 65 | EXPORT_SYMBOL_GPL(uv_setup_irq); | |
| 66 | ||
| 67 | /* | |
| 68 | * Tear down a mapping of an irq and vector, and disable the specified MMR that | |
| 69 | * defined the MSI that was to be sent to the specified CPU when an interrupt | |
| 70 | * was raised. | |
| 71 | * | |
| 72 | * Set mmr_blade and mmr_offset to what was passed in on uv_setup_irq(). | |
| 73 | */ | |
| 74 | void uv_teardown_irq(unsigned int irq, int mmr_blade, unsigned long mmr_offset) | |
| 75 | { | |
| 76 | arch_disable_uv_irq(mmr_blade, mmr_offset); | |
| 77 | destroy_irq(irq); | |
| 78 | } | |
| 79 | EXPORT_SYMBOL_GPL(uv_teardown_irq); |