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