1/* 2 * Ralink RT288x SoC specific interrupt handling 3 * 4 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org> 5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> 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 version 2 as published 9 * by the Free Software Foundation. 10 */ 11 12#include <linux/kernel.h> 13#include <linux/init.h> 14#include <linux/interrupt.h> 15#include <linux/irq.h> 16 17#include <asm/irq_cpu.h> 18#include <asm/mipsregs.h> 19 20#include <asm/mach-ralink/common.h> 21#include <asm/mach-ralink/rt288x.h> 22#include <asm/mach-ralink/rt288x_regs.h> 23 24static void rt288x_intc_irq_dispatch(void) 25{ 26 u32 pending; 27 28 pending = ramips_intc_get_status(); 29 30 if (pending & RT2880_INTC_INT_TIMER0) 31 do_IRQ(RT2880_INTC_IRQ_TIMER0); 32 33 else if (pending & RT2880_INTC_INT_TIMER1) 34 do_IRQ(RT2880_INTC_IRQ_TIMER1); 35 36 else if (pending & RT2880_INTC_INT_UART0) 37 do_IRQ(RT2880_INTC_IRQ_UART0); 38 39 else if (pending & RT2880_INTC_INT_PCM) 40 do_IRQ(RT2880_INTC_IRQ_PCM); 41 42 else if (pending & RT2880_INTC_INT_UART1) 43 do_IRQ(RT2880_INTC_IRQ_UART1); 44 45 /* TODO: handle PIO interrupts as well */ 46 47 else 48 spurious_interrupt(); 49} 50 51asmlinkage void plat_irq_dispatch(void) 52{ 53 unsigned long pending; 54 55 pending = read_c0_status() & read_c0_cause() & ST0_IM; 56 57 if (pending & STATUSF_IP7) 58 do_IRQ(RT288X_CPU_IRQ_COUNTER); 59 60 else if (pending & STATUSF_IP4) 61 do_IRQ(RT288X_CPU_IRQ_PCI); 62 63 else if (pending & STATUSF_IP5) 64 do_IRQ(RT288X_CPU_IRQ_FE); 65 66 else if (pending & STATUSF_IP6) 67 do_IRQ(RT288X_CPU_IRQ_WNIC); 68 69 else if (pending & STATUSF_IP2) 70 rt288x_intc_irq_dispatch(); 71 72 else 73 spurious_interrupt(); 74} 75 76void __init arch_init_irq(void) 77{ 78 mips_cpu_irq_init(); 79 ramips_intc_irq_init(RT2880_INTC_BASE, RT288X_CPU_IRQ_INTC, 80 RT288X_INTC_IRQ_BASE); 81} 82