1/*
2 *  Ralink RT305x SoC specific interrupt handling
3 *
4 *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
5 *
6 *  This program is free software; you can redistribute it and/or modify it
7 *  under the terms of the GNU General Public License version 2 as published
8 *  by the Free Software Foundation.
9 */
10
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/interrupt.h>
14#include <linux/irq.h>
15
16#include <asm/irq_cpu.h>
17#include <asm/mipsregs.h>
18
19#include <asm/mach-ralink/common.h>
20#include <asm/mach-ralink/rt305x.h>
21#include <asm/mach-ralink/rt305x_regs.h>
22
23static void rt305x_intc_irq_dispatch(void)
24{
25	u32 pending;
26
27	pending = ramips_intc_get_status();
28
29	if (pending & RT305X_INTC_INT_TIMER0)
30		do_IRQ(RT305X_INTC_IRQ_TIMER0);
31
32	else if (pending & RT305X_INTC_INT_TIMER1)
33		do_IRQ(RT305X_INTC_IRQ_TIMER1);
34
35	else if (pending & RT305X_INTC_INT_UART0)
36		do_IRQ(RT305X_INTC_IRQ_UART0);
37
38	else if (pending & RT305X_INTC_INT_UART1)
39		do_IRQ(RT305X_INTC_IRQ_UART1);
40
41	else if (pending &  RT305X_INTC_INT_PERFC)
42		do_IRQ(RT305X_INTC_IRQ_PERFC);
43
44	else if (pending & RT305X_INTC_INT_OTG)
45		do_IRQ(RT305X_INTC_IRQ_OTG);
46
47	/* TODO: handle PIO interrupts as well */
48
49	else
50		spurious_interrupt();
51}
52
53asmlinkage void plat_irq_dispatch(void)
54{
55	unsigned long pending;
56
57	pending = read_c0_status() & read_c0_cause() & ST0_IM;
58
59	if (pending & STATUSF_IP7)
60		do_IRQ(RT305X_CPU_IRQ_COUNTER);
61
62	else if (pending & STATUSF_IP5)
63		do_IRQ(RT305X_CPU_IRQ_FE);
64
65	else if (pending & STATUSF_IP6)
66		do_IRQ(RT305X_CPU_IRQ_WNIC);
67
68	else if (pending & STATUSF_IP2)
69		rt305x_intc_irq_dispatch();
70
71	else
72		spurious_interrupt();
73}
74
75void __init arch_init_irq(void)
76{
77	mips_cpu_irq_init();
78	ramips_intc_irq_init(RT305X_INTC_BASE, RT305X_CPU_IRQ_INTC,
79			     RT305X_INTC_IRQ_BASE);
80
81	cp0_perfcount_irq = RT305X_INTC_IRQ_PERFC;
82}
83