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/irq.h>
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17
18 #include <asm/irq_cpu.h>
19 #include <asm/mipsregs.h>
20 #include <asm/system.h>
21
unmask_rm9k_irq(struct irq_data * d)22 static inline void unmask_rm9k_irq(struct irq_data *d)
23 {
24 set_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
25 }
26
mask_rm9k_irq(struct irq_data * d)27 static inline void mask_rm9k_irq(struct irq_data *d)
28 {
29 clear_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
30 }
31
rm9k_cpu_irq_enable(struct irq_data * d)32 static inline void rm9k_cpu_irq_enable(struct irq_data *d)
33 {
34 unsigned long flags;
35
36 local_irq_save(flags);
37 unmask_rm9k_irq(d);
38 local_irq_restore(flags);
39 }
40
41 /*
42 * Performance counter interrupts are global on all processors.
43 */
local_rm9k_perfcounter_irq_startup(void * args)44 static void local_rm9k_perfcounter_irq_startup(void *args)
45 {
46 rm9k_cpu_irq_enable(args);
47 }
48
rm9k_perfcounter_irq_startup(struct irq_data * d)49 static unsigned int rm9k_perfcounter_irq_startup(struct irq_data *d)
50 {
51 on_each_cpu(local_rm9k_perfcounter_irq_startup, d, 1);
52
53 return 0;
54 }
55
local_rm9k_perfcounter_irq_shutdown(void * args)56 static void local_rm9k_perfcounter_irq_shutdown(void *args)
57 {
58 unsigned long flags;
59
60 local_irq_save(flags);
61 mask_rm9k_irq(args);
62 local_irq_restore(flags);
63 }
64
rm9k_perfcounter_irq_shutdown(struct irq_data * d)65 static void rm9k_perfcounter_irq_shutdown(struct irq_data *d)
66 {
67 on_each_cpu(local_rm9k_perfcounter_irq_shutdown, d, 1);
68 }
69
70 static struct irq_chip rm9k_irq_controller = {
71 .name = "RM9000",
72 .irq_ack = mask_rm9k_irq,
73 .irq_mask = mask_rm9k_irq,
74 .irq_mask_ack = mask_rm9k_irq,
75 .irq_unmask = unmask_rm9k_irq,
76 .irq_eoi = unmask_rm9k_irq
77 };
78
79 static struct irq_chip rm9k_perfcounter_irq = {
80 .name = "RM9000",
81 .irq_startup = rm9k_perfcounter_irq_startup,
82 .irq_shutdown = rm9k_perfcounter_irq_shutdown,
83 .irq_ack = mask_rm9k_irq,
84 .irq_mask = mask_rm9k_irq,
85 .irq_mask_ack = mask_rm9k_irq,
86 .irq_unmask = unmask_rm9k_irq,
87 };
88
89 unsigned int rm9000_perfcount_irq;
90
91 EXPORT_SYMBOL(rm9000_perfcount_irq);
92
rm9k_cpu_irq_init(void)93 void __init rm9k_cpu_irq_init(void)
94 {
95 int base = RM9K_CPU_IRQ_BASE;
96 int i;
97
98 clear_c0_intcontrol(0x0000f000); /* Mask all */
99
100 for (i = base; i < base + 4; i++)
101 irq_set_chip_and_handler(i, &rm9k_irq_controller,
102 handle_level_irq);
103
104 rm9000_perfcount_irq = base + 1;
105 irq_set_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
106 handle_percpu_irq);
107 }
108