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108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* Copyright (C) 2003 Ralf Baechle
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Handler for RM9000 extended interrupts. These are a non-standard
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* feature so we handle them separately from standard interrupts.
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/irq_cpu.h>
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#include <asm/mipsregs.h>
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#include <asm/system.h>
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static inline void unmask_rm9k_irq(struct irq_data *d)
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{
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set_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
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}
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static inline void mask_rm9k_irq(struct irq_data *d)
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{
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clear_c0_intcontrol(0x1000 << (d->irq - RM9K_CPU_IRQ_BASE));
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}
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static inline void rm9k_cpu_irq_enable(struct irq_data *d)
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{
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unsigned long flags;
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local_irq_save(flags);
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unmask_rm9k_irq(d);
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local_irq_restore(flags);
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}
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/*
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* Performance counter interrupts are global on all processors.
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*/
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static void local_rm9k_perfcounter_irq_startup(void *args)
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{
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rm9k_cpu_irq_enable(args);
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}
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static unsigned int rm9k_perfcounter_irq_startup(struct irq_data *d)
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{
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on_each_cpu(local_rm9k_perfcounter_irq_startup, d, 1);
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return 0;
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}
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static void local_rm9k_perfcounter_irq_shutdown(void *args)
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{
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unsigned long flags;
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local_irq_save(flags);
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mask_rm9k_irq(args);
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local_irq_restore(flags);
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}
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static void rm9k_perfcounter_irq_shutdown(struct irq_data *d)
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{
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on_each_cpu(local_rm9k_perfcounter_irq_shutdown, d, 1);
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}
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static struct irq_chip rm9k_irq_controller = {
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.name = "RM9000",
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.irq_ack = mask_rm9k_irq,
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.irq_mask = mask_rm9k_irq,
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.irq_mask_ack = mask_rm9k_irq,
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.irq_unmask = unmask_rm9k_irq,
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.irq_eoi = unmask_rm9k_irq
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};
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static struct irq_chip rm9k_perfcounter_irq = {
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.name = "RM9000",
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.irq_startup = rm9k_perfcounter_irq_startup,
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.irq_shutdown = rm9k_perfcounter_irq_shutdown,
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.irq_ack = mask_rm9k_irq,
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.irq_mask = mask_rm9k_irq,
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.irq_mask_ack = mask_rm9k_irq,
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.irq_unmask = unmask_rm9k_irq,
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};
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unsigned int rm9000_perfcount_irq;
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EXPORT_SYMBOL(rm9000_perfcount_irq);
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void __init rm9k_cpu_irq_init(void)
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{
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int base = RM9K_CPU_IRQ_BASE;
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int i;
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clear_c0_intcontrol(0x0000f000); /* Mask all */
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for (i = base; i < base + 4; i++)
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irq_set_chip_and_handler(i, &rm9k_irq_controller,
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handle_level_irq);
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rm9000_perfcount_irq = base + 1;
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irq_set_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
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handle_percpu_irq);
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}
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