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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2003 Ralf Baechle
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
8 *
9 * Handler for RM9000 extended interrupts. These are a non-standard
10 * feature so we handle them separately from standard interrupts.
11 */
12#include <linux/init.h>
13#include <linux/interrupt.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16
17#include <asm/irq_cpu.h>
18#include <asm/mipsregs.h>
19#include <asm/system.h>
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021static inline void unmask_rm9k_irq(unsigned int irq)
22{
Atsushi Nemoto97dcb822007-01-08 02:14:29 +090023 set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
Linus Torvalds1da177e2005-04-16 15:20:36 -070024}
25
26static inline void mask_rm9k_irq(unsigned int irq)
27{
Atsushi Nemoto97dcb822007-01-08 02:14:29 +090028 clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
Linus Torvalds1da177e2005-04-16 15:20:36 -070029}
30
31static inline void rm9k_cpu_irq_enable(unsigned int irq)
32{
33 unsigned long flags;
34
35 local_irq_save(flags);
36 unmask_rm9k_irq(irq);
37 local_irq_restore(flags);
38}
39
Linus Torvalds1da177e2005-04-16 15:20:36 -070040/*
41 * Performance counter interrupts are global on all processors.
42 */
43static void local_rm9k_perfcounter_irq_startup(void *args)
44{
45 unsigned int irq = (unsigned int) args;
46
47 rm9k_cpu_irq_enable(irq);
48}
49
50static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
51{
Jens Axboe15c8b6c2008-05-09 09:39:44 +020052 on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54 return 0;
55}
56
57static void local_rm9k_perfcounter_irq_shutdown(void *args)
58{
59 unsigned int irq = (unsigned int) args;
60 unsigned long flags;
61
62 local_irq_save(flags);
63 mask_rm9k_irq(irq);
64 local_irq_restore(flags);
65}
66
67static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
68{
Jens Axboe15c8b6c2008-05-09 09:39:44 +020069 on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
Ralf Baechle94dee172006-07-02 14:41:42 +010072static struct irq_chip rm9k_irq_controller = {
Atsushi Nemoto70d21cd2007-01-15 00:07:25 +090073 .name = "RM9000",
Atsushi Nemoto1603b5a2006-11-02 02:08:36 +090074 .ack = mask_rm9k_irq,
75 .mask = mask_rm9k_irq,
76 .mask_ack = mask_rm9k_irq,
77 .unmask = unmask_rm9k_irq,
Thomas Koellerc42d95d2008-02-11 23:42:12 +010078 .eoi = unmask_rm9k_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -070079};
80
Ralf Baechle94dee172006-07-02 14:41:42 +010081static struct irq_chip rm9k_perfcounter_irq = {
Atsushi Nemoto70d21cd2007-01-15 00:07:25 +090082 .name = "RM9000",
Ralf Baechle8ab00b92005-02-28 13:39:57 +000083 .startup = rm9k_perfcounter_irq_startup,
84 .shutdown = rm9k_perfcounter_irq_shutdown,
Atsushi Nemoto1603b5a2006-11-02 02:08:36 +090085 .ack = mask_rm9k_irq,
86 .mask = mask_rm9k_irq,
87 .mask_ack = mask_rm9k_irq,
88 .unmask = unmask_rm9k_irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -070089};
90
91unsigned int rm9000_perfcount_irq;
92
93EXPORT_SYMBOL(rm9000_perfcount_irq);
94
Atsushi Nemoto97dcb822007-01-08 02:14:29 +090095void __init rm9k_cpu_irq_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Atsushi Nemoto97dcb822007-01-08 02:14:29 +090097 int base = RM9K_CPU_IRQ_BASE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 int i;
99
100 clear_c0_intcontrol(0x0000f000); /* Mask all */
101
Atsushi Nemoto1603b5a2006-11-02 02:08:36 +0900102 for (i = base; i < base + 4; i++)
Atsushi Nemoto14178362006-11-14 01:13:18 +0900103 set_irq_chip_and_handler(i, &rm9k_irq_controller,
104 handle_level_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106 rm9000_perfcount_irq = base + 1;
Atsushi Nemoto14178362006-11-14 01:13:18 +0900107 set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
Ralf Baechle30e748a2007-11-15 19:37:15 +0000108 handle_percpu_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}