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1 /*
2 * irq.c: GT64120 Interrupt Controller
3 *
4 * Copyright (C) 2006, Wind River System Inc.
5 * Author: Rongkai.Zhan, <rongkai.zhan@windriver.com>
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 as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
11 */
12 #include <linux/hardirq.h>
13 #include <linux/init.h>
14 #include <linux/irq.h>
15
16 #include <asm/gt64120.h>
17 #include <asm/irq_cpu.h>
18 #include <asm/mipsregs.h>
19
20 asmlinkage void plat_irq_dispatch(void)
21 {
22 unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
23
24 if (pending & STATUSF_IP7)
25 do_IRQ(WRPPMC_MIPS_TIMER_IRQ); /* CPU Compare/Count internal timer */
26 else if (pending & STATUSF_IP6)
27 do_IRQ(WRPPMC_UART16550_IRQ); /* UART 16550 port */
28 else if (pending & STATUSF_IP3)
29 do_IRQ(WRPPMC_PCI_INTA_IRQ); /* PCI INT_A */
30 else
31 spurious_interrupt();
32 }
33
34 /**
35 * Initialize GT64120 Interrupt Controller
36 */
37 void gt64120_init_pic(void)
38 {
39 /* clear CPU Interrupt Cause Registers */
40 GT_WRITE(GT_INTRCAUSE_OFS, (0x1F << 21));
41 GT_WRITE(GT_HINTRCAUSE_OFS, 0x00);
42
43 /* Disable all interrupts from GT64120 bridge chip */
44 GT_WRITE(GT_INTRMASK_OFS, 0x00);
45 GT_WRITE(GT_HINTRMASK_OFS, 0x00);
46 GT_WRITE(GT_PCI0_ICMASK_OFS, 0x00);
47 GT_WRITE(GT_PCI0_HICMASK_OFS, 0x00);
48 }
49
50 void __init arch_init_irq(void)
51 {
52 /* IRQ 0 - 7 are for MIPS common irq_cpu controller */
53 mips_cpu_irq_init();
54
55 gt64120_init_pic();
56 }