1/* 2 * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology 3 * Author: Fuxin Zhang, zhangfx@lemote.com 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 */ 10#include <linux/interrupt.h> 11 12#include <asm/irq_cpu.h> 13#include <asm/i8259.h> 14 15#include <loongson.h> 16 17static void i8259_irqdispatch(void) 18{ 19 int irq; 20 21 irq = i8259_irq(); 22 if (irq >= 0) 23 do_IRQ(irq); 24 else 25 spurious_interrupt(); 26} 27 28asmlinkage void mach_irq_dispatch(unsigned int pending) 29{ 30 if (pending & CAUSEF_IP7) 31 do_IRQ(MIPS_CPU_IRQ_BASE + 7); 32 else if (pending & CAUSEF_IP6) /* perf counter loverflow */ 33 do_perfcnt_IRQ(); 34 else if (pending & CAUSEF_IP5) 35 i8259_irqdispatch(); 36 else if (pending & CAUSEF_IP2) 37 bonito_irqdispatch(); 38 else 39 spurious_interrupt(); 40} 41 42static struct irqaction cascade_irqaction = { 43 .handler = no_action, 44 .name = "cascade", 45}; 46 47void __init mach_init_irq(void) 48{ 49 /* init all controller 50 * 0-15 ------> i8259 interrupt 51 * 16-23 ------> mips cpu interrupt 52 * 32-63 ------> bonito irq 53 */ 54 55 /* most bonito irq should be level triggered */ 56 LOONGSON_INTEDGE = LOONGSON_ICU_SYSTEMERR | LOONGSON_ICU_MASTERERR | 57 LOONGSON_ICU_RETRYERR | LOONGSON_ICU_MBOXES; 58 59 /* Sets the first-level interrupt dispatcher. */ 60 mips_cpu_irq_init(); 61 init_i8259_irqs(); 62 bonito_irq_init(); 63 64 /* bonito irq at IP2 */ 65 setup_irq(MIPS_CPU_IRQ_BASE + 2, &cascade_irqaction); 66 /* 8259 irq at IP5 */ 67 setup_irq(MIPS_CPU_IRQ_BASE + 5, &cascade_irqaction); 68} 69