2 * Ralink RT288x SoC specific interrupt handling
4 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
17 #include <asm/irq_cpu.h>
18 #include <asm/mipsregs.h>
20 #include <asm/mach-ralink/rt288x.h>
21 #include <asm/mach-ralink/rt288x_regs.h>
23 static void rt288x_intc_irq_dispatch(void)
27 pending = rt288x_intc_rr(INTC_REG_STATUS0);
29 if (pending & RT2880_INTC_INT_TIMER0)
30 do_IRQ(RT2880_INTC_IRQ_TIMER0);
32 else if (pending & RT2880_INTC_INT_TIMER1)
33 do_IRQ(RT2880_INTC_IRQ_TIMER1);
35 else if (pending & RT2880_INTC_INT_UART0)
36 do_IRQ(RT2880_INTC_IRQ_UART0);
38 else if (pending & RT2880_INTC_INT_PCM)
39 do_IRQ(RT2880_INTC_IRQ_PCM);
41 else if (pending & RT2880_INTC_INT_UART1)
42 do_IRQ(RT2880_INTC_IRQ_UART1);
44 /* TODO: handle PIO interrupts as well */
50 static void rt288x_intc_irq_unmask(unsigned int irq)
52 irq -= RT288X_INTC_IRQ_BASE;
53 rt288x_intc_wr((1 << irq), INTC_REG_ENABLE);
56 static void rt288x_intc_irq_mask(unsigned int irq)
58 irq -= RT288X_INTC_IRQ_BASE;
59 rt288x_intc_wr((1 << irq), INTC_REG_DISABLE);
62 struct irq_chip rt288x_intc_irq_chip = {
63 .name = "RT288X INTC",
64 .unmask = rt288x_intc_irq_unmask,
65 .mask = rt288x_intc_irq_mask,
66 .mask_ack = rt288x_intc_irq_mask,
69 static struct irqaction rt288x_intc_irqaction = {
71 .name = "cascade [RT288X INTC]",
74 static void __init rt288x_intc_irq_init(void)
78 /* disable all interrupts */
79 rt288x_intc_wr(~0, INTC_REG_DISABLE);
81 /* route all INTC interrupts to MIPS HW0 interrupt */
82 rt288x_intc_wr(0, INTC_REG_TYPE);
84 for (i = RT288X_INTC_IRQ_BASE;
85 i < RT288X_INTC_IRQ_BASE + RT288X_INTC_IRQ_COUNT; i++) {
86 irq_desc[i].status = IRQ_DISABLED;
87 set_irq_chip_and_handler(i, &rt288x_intc_irq_chip,
91 setup_irq(RT288X_CPU_IRQ_INTC, &rt288x_intc_irqaction);
93 rt288x_intc_wr(RT2880_INTC_INT_GLOBAL, INTC_REG_ENABLE);
96 asmlinkage void plat_irq_dispatch(void)
98 unsigned long pending;
100 pending = read_c0_status() & read_c0_cause() & ST0_IM;
102 if (pending & STATUSF_IP7)
103 do_IRQ(RT288X_CPU_IRQ_COUNTER);
105 else if (pending & STATUSF_IP4)
106 do_IRQ(RT288X_CPU_IRQ_PCI);
108 else if (pending & STATUSF_IP5)
109 do_IRQ(RT288X_CPU_IRQ_FE);
111 else if (pending & STATUSF_IP6)
112 do_IRQ(RT288X_CPU_IRQ_WNIC);
114 else if (pending & STATUSF_IP2)
115 rt288x_intc_irq_dispatch();
118 spurious_interrupt();
121 void __init arch_init_irq(void)
124 rt288x_intc_irq_init();