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