ramips: add preliminary support for the RT3662/RT3883 SoCs
[openwrt.git] / target / linux / ramips / files / arch / mips / ralink / rt3883 / irq.c
1 /*
2  *  Ralink RT3662/RT3883 SoC specific interrupt handling
3  *
4  *  Copyright (C) 2011-2012 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/rt3883.h>
21 #include <asm/mach-ralink/rt3883_regs.h>
22
23 static void rt3883_intc_irq_dispatch(void)
24 {
25         u32 pending;
26
27         pending = ramips_intc_get_status();
28
29         if (pending & RT3883_INTC_INT_TIMER0)
30                 do_IRQ(RT3883_INTC_IRQ_TIMER0);
31
32         else if (pending & RT3883_INTC_INT_TIMER1)
33                 do_IRQ(RT3883_INTC_IRQ_TIMER1);
34
35         else if (pending & RT3883_INTC_INT_UART0)
36                 do_IRQ(RT3883_INTC_IRQ_UART0);
37
38         else if (pending & RT3883_INTC_INT_UART1)
39                 do_IRQ(RT3883_INTC_IRQ_UART1);
40
41         else if (pending & RT3883_INTC_INT_PERFC)
42                 do_IRQ(RT3883_INTC_IRQ_PERFC);
43
44         else if (pending & RT3883_INTC_INT_UHST)
45                 do_IRQ(RT3883_INTC_IRQ_UHST);
46
47         /* TODO: handle PIO interrupts as well */
48
49         else
50                 spurious_interrupt();
51 }
52
53 asmlinkage 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(RT3883_CPU_IRQ_COUNTER);
61
62         else if (pending & STATUSF_IP5)
63                 do_IRQ(RT3883_CPU_IRQ_FE);
64
65         else if (pending & STATUSF_IP6)
66                 do_IRQ(RT3883_CPU_IRQ_WLAN);
67
68         else if (pending & STATUSF_IP4)
69                 do_IRQ(RT3883_CPU_IRQ_PCI);
70
71         else if (pending & STATUSF_IP2)
72                 rt3883_intc_irq_dispatch();
73
74         else
75                 spurious_interrupt();
76 }
77
78 void __init arch_init_irq(void)
79 {
80         mips_cpu_irq_init();
81         ramips_intc_irq_init(RT3883_INTC_BASE, RT3883_CPU_IRQ_INTC,
82                              RT3883_INTC_IRQ_BASE);
83         cp0_perfcount_irq = RT3883_INTC_IRQ_PERFC;
84 }