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