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>
21 static inline void unmask_rm9k_irq(unsigned int irq)
23 set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
26 static inline void mask_rm9k_irq(unsigned int irq)
28 clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
31 static inline void rm9k_cpu_irq_enable(unsigned int irq)
35 local_irq_save(flags);
37 local_irq_restore(flags);
41 * Performance counter interrupts are global on all processors.
43 static void local_rm9k_perfcounter_irq_startup(void *args)
45 unsigned int irq = (unsigned int) args;
47 rm9k_cpu_irq_enable(irq);
50 static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
52 on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 1);
57 static void local_rm9k_perfcounter_irq_shutdown(void *args)
59 unsigned int irq = (unsigned int) args;
62 local_irq_save(flags);
64 local_irq_restore(flags);
67 static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
69 on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 1);
72 static struct irq_chip rm9k_irq_controller = {
75 .mask = mask_rm9k_irq,
76 .mask_ack = mask_rm9k_irq,
77 .unmask = unmask_rm9k_irq,
78 .eoi = unmask_rm9k_irq
81 static struct irq_chip rm9k_perfcounter_irq = {
83 .startup = rm9k_perfcounter_irq_startup,
84 .shutdown = rm9k_perfcounter_irq_shutdown,
86 .mask = mask_rm9k_irq,
87 .mask_ack = mask_rm9k_irq,
88 .unmask = unmask_rm9k_irq,
91 unsigned int rm9000_perfcount_irq;
93 EXPORT_SYMBOL(rm9000_perfcount_irq);
95 void __init rm9k_cpu_irq_init(void)
97 int base = RM9K_CPU_IRQ_BASE;
100 clear_c0_intcontrol(0x0000f000); /* Mask all */
102 for (i = base; i < base + 4; i++)
103 set_irq_chip_and_handler(i, &rm9k_irq_controller,
106 rm9000_perfcount_irq = base + 1;
107 set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,