2 * Copyright (C) 2003 Ralf Baechle
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.
9 * Handler for RM9000 extended interrupts. These are a non-standard
10 * feature so we handle them separately from standard interrupts.
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
17 #include <asm/irq_cpu.h>
18 #include <asm/mipsregs.h>
19 #include <asm/system.h>
23 static inline void unmask_rm9k_irq(unsigned int irq)
25 set_c0_intcontrol(0x1000 << (irq - irq_base));
28 static inline void mask_rm9k_irq(unsigned int irq)
30 clear_c0_intcontrol(0x1000 << (irq - irq_base));
33 static inline void rm9k_cpu_irq_enable(unsigned int irq)
37 local_irq_save(flags);
39 local_irq_restore(flags);
42 static void rm9k_cpu_irq_disable(unsigned int irq)
46 local_irq_save(flags);
48 local_irq_restore(flags);
52 * Performance counter interrupts are global on all processors.
54 static void local_rm9k_perfcounter_irq_startup(void *args)
56 unsigned int irq = (unsigned int) args;
58 rm9k_cpu_irq_enable(irq);
61 static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
63 on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 0, 1);
68 static void local_rm9k_perfcounter_irq_shutdown(void *args)
70 unsigned int irq = (unsigned int) args;
73 local_irq_save(flags);
75 local_irq_restore(flags);
78 static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
80 on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 0, 1);
83 static void rm9k_cpu_irq_end(unsigned int irq)
85 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
89 static struct irq_chip rm9k_irq_controller = {
92 .mask = mask_rm9k_irq,
93 .mask_ack = mask_rm9k_irq,
94 .unmask = unmask_rm9k_irq,
95 .end = rm9k_cpu_irq_end,
98 static struct irq_chip rm9k_perfcounter_irq = {
100 .startup = rm9k_perfcounter_irq_startup,
101 .shutdown = rm9k_perfcounter_irq_shutdown,
102 .ack = mask_rm9k_irq,
103 .mask = mask_rm9k_irq,
104 .mask_ack = mask_rm9k_irq,
105 .unmask = unmask_rm9k_irq,
106 .end = rm9k_cpu_irq_end,
109 unsigned int rm9000_perfcount_irq;
111 EXPORT_SYMBOL(rm9000_perfcount_irq);
113 void __init rm9k_cpu_irq_init(int base)
117 clear_c0_intcontrol(0x0000f000); /* Mask all */
119 for (i = base; i < base + 4; i++)
120 set_irq_chip(i, &rm9k_irq_controller);
122 rm9000_perfcount_irq = base + 1;
123 set_irq_chip(rm9000_perfcount_irq, &rm9k_perfcounter_irq);