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