1 /* 2 * IRQ vector handles 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle 9 */ 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/irq.h> 13 #include <linux/interrupt.h> 14 #include <linux/pci.h> 15 16 #include <asm/i8259.h> 17 #include <asm/irq_cpu.h> 18 #include <asm/irq_gt641xx.h> 19 #include <asm/gt64120.h> 20 21 #include <irq.h> 22 23 asmlinkage void plat_irq_dispatch(void) 24 { 25 unsigned pending = read_c0_status() & read_c0_cause() & ST0_IM; 26 int irq; 27 28 if (pending & CAUSEF_IP2) 29 gt641xx_irq_dispatch(); 30 else if (pending & CAUSEF_IP6) { 31 irq = i8259_irq(); 32 if (irq < 0) 33 spurious_interrupt(); 34 else 35 do_IRQ(irq); 36 } else if (pending & CAUSEF_IP3) 37 do_IRQ(MIPS_CPU_IRQ_BASE + 3); 38 else if (pending & CAUSEF_IP4) 39 do_IRQ(MIPS_CPU_IRQ_BASE + 4); 40 else if (pending & CAUSEF_IP5) 41 do_IRQ(MIPS_CPU_IRQ_BASE + 5); 42 else if (pending & CAUSEF_IP7) 43 do_IRQ(MIPS_CPU_IRQ_BASE + 7); 44 else 45 spurious_interrupt(); 46 } 47 48 void __init arch_init_irq(void) 49 { 50 mips_cpu_irq_init(); 51 gt641xx_irq_init(); 52 init_i8259_irqs(); 53 54 if (request_irq(GT641XX_CASCADE_IRQ, no_action, IRQF_NO_THREAD, 55 "cascade", NULL)) { 56 pr_err("Failed to request irq %d (cascade)\n", 57 GT641XX_CASCADE_IRQ); 58 } 59 if (request_irq(I8259_CASCADE_IRQ, no_action, IRQF_NO_THREAD, 60 "cascade", NULL)) { 61 pr_err("Failed to request irq %d (cascade)\n", 62 I8259_CASCADE_IRQ); 63 } 64 } 65