2 * Ralink RT305x SoC specific interrupt handling
4 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/interrupt.h>
14 #include <linux/irq.h>
16 #include <asm/irq_cpu.h>
17 #include <asm/mipsregs.h>
19 #include <asm/mach-ralink/rt305x.h>
20 #include <asm/mach-ralink/rt305x_regs.h>
22 static void rt305x_intc_irq_dispatch(void)
26 pending
= rt305x_intc_rr(INTC_REG_STATUS0
);
28 if (pending
& RT305X_INTC_INT_TIMER0
)
29 do_IRQ(RT305X_INTC_IRQ_TIMER0
);
31 else if (pending
& RT305X_INTC_INT_TIMER1
)
32 do_IRQ(RT305X_INTC_IRQ_TIMER1
);
34 else if (pending
& RT305X_INTC_INT_UART0
)
35 do_IRQ(RT305X_INTC_IRQ_UART0
);
37 else if (pending
& RT305X_INTC_INT_UART1
)
38 do_IRQ(RT305X_INTC_IRQ_UART1
);
40 /* TODO: handle PIO interrupts as well */
46 static void rt305x_intc_irq_unmask(unsigned int irq
)
48 irq
-= RT305X_INTC_IRQ_BASE
;
49 rt305x_intc_wr((1 << irq
), INTC_REG_ENABLE
);
52 static void rt305x_intc_irq_mask(unsigned int irq
)
54 irq
-= RT305X_INTC_IRQ_BASE
;
55 rt305x_intc_wr((1 << irq
), INTC_REG_DISABLE
);
58 struct irq_chip rt305x_intc_irq_chip
= {
59 .name
= "RT305X INTC",
60 .unmask
= rt305x_intc_irq_unmask
,
61 .mask
= rt305x_intc_irq_mask
,
62 .mask_ack
= rt305x_intc_irq_mask
,
65 static struct irqaction rt305x_intc_irqaction
= {
67 .name
= "cascade [RT305X INTC]",
70 static void __init
rt305x_intc_irq_init(void)
74 /* disable all interrupts */
75 rt305x_intc_wr(~0, INTC_REG_DISABLE
);
77 /* route all INTC interrupts to MIPS HW0 interrupt */
78 rt305x_intc_wr(0, INTC_REG_TYPE
);
80 for (i
= RT305X_INTC_IRQ_BASE
;
81 i
< RT305X_INTC_IRQ_BASE
+ RT305X_INTC_IRQ_COUNT
; i
++) {
82 set_irq_chip_and_handler(i
, &rt305x_intc_irq_chip
,
86 setup_irq(RT305X_CPU_IRQ_INTC
, &rt305x_intc_irqaction
);
88 /* enable interrupt masking */
89 rt305x_intc_wr(RT305X_INTC_INT_GLOBAL
, INTC_REG_ENABLE
);
92 asmlinkage
void plat_irq_dispatch(void)
94 unsigned long pending
;
96 pending
= read_c0_status() & read_c0_cause() & ST0_IM
;
98 if (pending
& STATUSF_IP7
)
99 do_IRQ(RT305X_CPU_IRQ_COUNTER
);
101 else if (pending
& STATUSF_IP5
)
102 do_IRQ(RT305X_CPU_IRQ_FE
);
104 else if (pending
& STATUSF_IP6
)
105 do_IRQ(RT305X_CPU_IRQ_WNIC
);
107 else if (pending
& STATUSF_IP2
)
108 rt305x_intc_irq_dispatch();
111 spurious_interrupt();
114 void __init
arch_init_irq(void)
117 rt305x_intc_irq_init();