diff options
Diffstat (limited to 'arch/x86/kernel/uv_irq.c')
-rw-r--r-- | arch/x86/kernel/uv_irq.c | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/x86/kernel/uv_irq.c b/arch/x86/kernel/uv_irq.c new file mode 100644 index 000000000000..aeef529917e4 --- /dev/null +++ b/arch/x86/kernel/uv_irq.c | |||
@@ -0,0 +1,79 @@ | |||
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 | |||
14 | #include <asm/apic.h> | ||
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); | ||