99 lines
2.2 KiB
C
99 lines
2.2 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 RM7000 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/kernel.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 int irq_base;
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static inline void unmask_rm7k_irq(unsigned int irq)
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{
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set_c0_intcontrol(0x100 << (irq - irq_base));
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}
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static inline void mask_rm7k_irq(unsigned int irq)
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{
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clear_c0_intcontrol(0x100 << (irq - irq_base));
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}
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static inline void rm7k_cpu_irq_enable(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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unmask_rm7k_irq(irq);
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local_irq_restore(flags);
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}
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static void rm7k_cpu_irq_disable(unsigned int irq)
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{
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unsigned long flags;
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local_irq_save(flags);
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mask_rm7k_irq(irq);
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local_irq_restore(flags);
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}
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static unsigned int rm7k_cpu_irq_startup(unsigned int irq)
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{
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rm7k_cpu_irq_enable(irq);
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return 0;
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}
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#define rm7k_cpu_irq_shutdown rm7k_cpu_irq_disable
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/*
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* While we ack the interrupt interrupts are disabled and thus we don't need
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* to deal with concurrency issues. Same for rm7k_cpu_irq_end.
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*/
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static void rm7k_cpu_irq_ack(unsigned int irq)
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{
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mask_rm7k_irq(irq);
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}
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static void rm7k_cpu_irq_end(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
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unmask_rm7k_irq(irq);
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}
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static struct irq_chip rm7k_irq_controller = {
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.typename = "RM7000",
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.startup = rm7k_cpu_irq_startup,
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.shutdown = rm7k_cpu_irq_shutdown,
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.enable = rm7k_cpu_irq_enable,
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.disable = rm7k_cpu_irq_disable,
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.ack = rm7k_cpu_irq_ack,
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.end = rm7k_cpu_irq_end,
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};
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void __init rm7k_cpu_irq_init(int base)
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{
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int i;
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clear_c0_intcontrol(0x00000f00); /* Mask all */
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for (i = base; i < base + 4; i++) {
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irq_desc[i].status = IRQ_DISABLED;
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irq_desc[i].action = NULL;
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irq_desc[i].depth = 1;
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irq_desc[i].chip = &rm7k_irq_controller;
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}
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irq_base = base;
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}
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