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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 RM7000 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
16#include <asm/irq_cpu.h>
17#include <asm/mipsregs.h>
18#include <asm/system.h>
19
20static int irq_base;
21
22static inline void unmask_rm7k_irq(unsigned int irq)
23{
24 set_c0_intcontrol(0x100 << (irq - irq_base));
25}
26
27static inline void mask_rm7k_irq(unsigned int irq)
28{
29 clear_c0_intcontrol(0x100 << (irq - irq_base));
30}
31
32static inline void rm7k_cpu_irq_enable(unsigned int irq)
33{
34 unsigned long flags;
35
36 local_irq_save(flags);
37 unmask_rm7k_irq(irq);
38 local_irq_restore(flags);
39}
40
41static void rm7k_cpu_irq_disable(unsigned int irq)
42{
43 unsigned long flags;
44
45 local_irq_save(flags);
46 mask_rm7k_irq(irq);
47 local_irq_restore(flags);
48}
49
50static unsigned int rm7k_cpu_irq_startup(unsigned int irq)
51{
52 rm7k_cpu_irq_enable(irq);
53
54 return 0;
55}
56
57#define rm7k_cpu_irq_shutdown rm7k_cpu_irq_disable
58
59/*
60 * While we ack the interrupt interrupts are disabled and thus we don't need
61 * to deal with concurrency issues. Same for rm7k_cpu_irq_end.
62 */
63static void rm7k_cpu_irq_ack(unsigned int irq)
64{
65 mask_rm7k_irq(irq);
66}
67
68static void rm7k_cpu_irq_end(unsigned int irq)
69{
70 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
71 unmask_rm7k_irq(irq);
72}
73
74static hw_irq_controller rm7k_irq_controller = {
75 "RM7000",
76 rm7k_cpu_irq_startup,
77 rm7k_cpu_irq_shutdown,
78 rm7k_cpu_irq_enable,
79 rm7k_cpu_irq_disable,
80 rm7k_cpu_irq_ack,
81 rm7k_cpu_irq_end,
82};
83
84void __init rm7k_cpu_irq_init(int base)
85{
86 int i;
87
88 clear_c0_intcontrol(0x00000f00); /* Mask all */
89
90 for (i = base; i < base + 4; i++) {
91 irq_desc[i].status = IRQ_DISABLED;
92 irq_desc[i].action = NULL;
93 irq_desc[i].depth = 1;
94 irq_desc[i].handler = &rm7k_irq_controller;
95 }
96
97 irq_base = base;
98}