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
uv_noop(unsigned int irq)17 static void uv_noop(unsigned int irq)
18 {
19 }
20
uv_noop_ret(unsigned int irq)21 static unsigned int uv_noop_ret(unsigned int irq)
22 {
23 return 0;
24 }
25
uv_ack_apic(unsigned int irq)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 */
uv_setup_irq(char * irq_name,int cpu,int mmr_blade,unsigned long mmr_offset)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 */
uv_teardown_irq(unsigned int irq,int mmr_blade,unsigned long mmr_offset)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);
80