1/*
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
21static inline void unmask_rm9k_irq(unsigned int irq)
22{
23	set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
24}
25
26static inline void mask_rm9k_irq(unsigned int irq)
27{
28	clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
29}
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
40/*
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{
52	on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 0, 1);
53
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{
69	on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 0, 1);
70}
71
72static struct irq_chip rm9k_irq_controller = {
73	.name = "RM9000",
74	.ack = mask_rm9k_irq,
75	.mask = mask_rm9k_irq,
76	.mask_ack = mask_rm9k_irq,
77	.unmask = unmask_rm9k_irq,
78};
79
80static struct irq_chip rm9k_perfcounter_irq = {
81	.name = "RM9000",
82	.startup = rm9k_perfcounter_irq_startup,
83	.shutdown = rm9k_perfcounter_irq_shutdown,
84	.ack = mask_rm9k_irq,
85	.mask = mask_rm9k_irq,
86	.mask_ack = mask_rm9k_irq,
87	.unmask = unmask_rm9k_irq,
88};
89
90unsigned int rm9000_perfcount_irq;
91
92EXPORT_SYMBOL(rm9000_perfcount_irq);
93
94void __init rm9k_cpu_irq_init(void)
95{
96	int base = RM9K_CPU_IRQ_BASE;
97	int i;
98
99	clear_c0_intcontrol(0x0000f000);		/* Mask all */
100
101	for (i = base; i < base + 4; i++)
102		set_irq_chip_and_handler(i, &rm9k_irq_controller,
103					 handle_level_irq);
104
105	rm9000_perfcount_irq = base + 1;
106	set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
107				 handle_level_irq);
108}
109