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/kernel.h> 15#include <linux/module.h> 16 17#include <asm/irq_cpu.h> 18#include <asm/mipsregs.h> 19#include <asm/system.h> 20 21static inline void unmask_rm9k_irq(unsigned int irq) 22{ 23 set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE)); 24} 25 26static inline void mask_rm9k_irq(unsigned int irq) 27{ 28 clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE)); 29} 30 31static inline void rm9k_cpu_irq_enable(unsigned int irq) 32{ 33 unsigned long flags; 34 35 local_irq_save(flags); 36 unmask_rm9k_irq(irq); 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 unsigned int irq = (unsigned int) args; 46 47 rm9k_cpu_irq_enable(irq); 48} 49 50static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq) 51{ 52 on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 1); 53 54 return 0; 55} 56 57static void local_rm9k_perfcounter_irq_shutdown(void *args) 58{ 59 unsigned int irq = (unsigned int) args; 60 unsigned long flags; 61 62 local_irq_save(flags); 63 mask_rm9k_irq(irq); 64 local_irq_restore(flags); 65} 66 67static void rm9k_perfcounter_irq_shutdown(unsigned int irq) 68{ 69 on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 1); 70} 71 72static struct irq_chip rm9k_irq_controller = { 73 .name = "RM9000", 74 .ack = mask_rm9k_irq, 75 .mask = mask_rm9k_irq, 76 .mask_ack = mask_rm9k_irq, 77 .unmask = unmask_rm9k_irq, 78 .eoi = unmask_rm9k_irq 79}; 80 81static struct irq_chip rm9k_perfcounter_irq = { 82 .name = "RM9000", 83 .startup = rm9k_perfcounter_irq_startup, 84 .shutdown = rm9k_perfcounter_irq_shutdown, 85 .ack = mask_rm9k_irq, 86 .mask = mask_rm9k_irq, 87 .mask_ack = mask_rm9k_irq, 88 .unmask = unmask_rm9k_irq, 89}; 90 91unsigned int rm9000_perfcount_irq; 92 93EXPORT_SYMBOL(rm9000_perfcount_irq); 94 95void __init rm9k_cpu_irq_init(void) 96{ 97 int base = RM9K_CPU_IRQ_BASE; 98 int i; 99 100 clear_c0_intcontrol(0x0000f000); /* Mask all */ 101 102 for (i = base; i < base + 4; i++) 103 set_irq_chip_and_handler(i, &rm9k_irq_controller, 104 handle_level_irq); 105 106 rm9000_perfcount_irq = base + 1; 107 set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq, 108 handle_percpu_irq); 109} 110