| Dean Nelson | 4173a0e | 2008-10-02 12:18:21 -0500 | [diff] [blame^] | 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> |
| 13 | #include <asm/uv/uv_irq.h> |
| 14 | |
| 15 | static void uv_noop(unsigned int irq) |
| 16 | { |
| 17 | } |
| 18 | |
| 19 | static unsigned int uv_noop_ret(unsigned int irq) |
| 20 | { |
| 21 | return 0; |
| 22 | } |
| 23 | |
| 24 | static void uv_ack_apic(unsigned int irq) |
| 25 | { |
| 26 | ack_APIC_irq(); |
| 27 | } |
| 28 | |
| 29 | struct irq_chip uv_irq_chip = { |
| 30 | .name = "UV-CORE", |
| 31 | .startup = uv_noop_ret, |
| 32 | .shutdown = uv_noop, |
| 33 | .enable = uv_noop, |
| 34 | .disable = uv_noop, |
| 35 | .ack = uv_noop, |
| 36 | .mask = uv_noop, |
| 37 | .unmask = uv_noop, |
| 38 | .eoi = uv_ack_apic, |
| 39 | .end = uv_noop, |
| 40 | }; |
| 41 | |
| 42 | /* |
| 43 | * Set up a mapping of an available irq and vector, and enable the specified |
| 44 | * MMR that defines the MSI that is to be sent to the specified CPU when an |
| 45 | * interrupt is raised. |
| 46 | */ |
| 47 | int uv_setup_irq(char *irq_name, int cpu, int mmr_blade, |
| 48 | unsigned long mmr_offset) |
| 49 | { |
| 50 | int irq; |
| 51 | int ret; |
| 52 | |
| 53 | irq = create_irq(); |
| 54 | if (irq <= 0) |
| 55 | return -EBUSY; |
| 56 | |
| 57 | ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset); |
| 58 | if (ret != irq) |
| 59 | destroy_irq(irq); |
| 60 | |
| 61 | return ret; |
| 62 | } |
| 63 | EXPORT_SYMBOL_GPL(uv_setup_irq); |
| 64 | |
| 65 | /* |
| 66 | * Tear down a mapping of an irq and vector, and disable the specified MMR that |
| 67 | * defined the MSI that was to be sent to the specified CPU when an interrupt |
| 68 | * was raised. |
| 69 | * |
| 70 | * Set mmr_blade and mmr_offset to what was passed in on uv_setup_irq(). |
| 71 | */ |
| 72 | void uv_teardown_irq(unsigned int irq, int mmr_blade, unsigned long mmr_offset) |
| 73 | { |
| 74 | arch_disable_uv_irq(mmr_blade, mmr_offset); |
| 75 | destroy_irq(irq); |
| 76 | } |
| 77 | EXPORT_SYMBOL_GPL(uv_teardown_irq); |