1/* 2 * irq.c: GT64120 Interrupt Controller 3 * 4 * Copyright (C) 2006, Wind River System Inc. 5 * Author: Rongkai.Zhan, <rongkai.zhan@windriver.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12#include <linux/errno.h> 13#include <linux/init.h> 14#include <linux/kernel_stat.h> 15#include <linux/module.h> 16#include <linux/signal.h> 17#include <linux/sched.h> 18#include <linux/types.h> 19#include <linux/interrupt.h> 20#include <linux/ioport.h> 21#include <linux/timex.h> 22#include <linux/slab.h> 23#include <linux/random.h> 24#include <linux/bitops.h> 25#include <asm/bootinfo.h> 26#include <asm/io.h> 27#include <asm/bitops.h> 28#include <asm/mipsregs.h> 29#include <asm/system.h> 30#include <asm/irq_cpu.h> 31#include <asm/gt64120.h> 32 33asmlinkage void plat_irq_dispatch(void) 34{ 35 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM; 36 37 if (pending & STATUSF_IP7) 38 do_IRQ(WRPPMC_MIPS_TIMER_IRQ); /* CPU Compare/Count internal timer */ 39 else if (pending & STATUSF_IP6) 40 do_IRQ(WRPPMC_UART16550_IRQ); /* UART 16550 port */ 41 else if (pending & STATUSF_IP3) 42 do_IRQ(WRPPMC_PCI_INTA_IRQ); /* PCI INT_A */ 43 else 44 spurious_interrupt(); 45} 46 47/** 48 * Initialize GT64120 Interrupt Controller 49 */ 50void gt64120_init_pic(void) 51{ 52 /* clear CPU Interrupt Cause Registers */ 53 GT_WRITE(GT_INTRCAUSE_OFS, (0x1F << 21)); 54 GT_WRITE(GT_HINTRCAUSE_OFS, 0x00); 55 56 /* Disable all interrupts from GT64120 bridge chip */ 57 GT_WRITE(GT_INTRMASK_OFS, 0x00); 58 GT_WRITE(GT_HINTRMASK_OFS, 0x00); 59 GT_WRITE(GT_PCI0_ICMASK_OFS, 0x00); 60 GT_WRITE(GT_PCI0_HICMASK_OFS, 0x00); 61} 62 63void __init arch_init_irq(void) 64{ 65 /* IRQ 0 - 7 are for MIPS common irq_cpu controller */ 66 mips_cpu_irq_init(); 67 68 gt64120_init_pic(); 69} 70