2 * irq.c: GT64120 Interrupt Controller
4 * Copyright (C) 2006, Wind River System Inc.
5 * Author: Rongkai.Zhan, <rongkai.zhan@windriver.com>
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.
12 #include <linux/errno.h>
13 #include <linux/init.h>
14 #include <linux/kernel_stat.h>
15 #include <linux/module.h>
16 #include <linux/signal.h>
17 #include <linux/sched.h>
18 #include <linux/types.h>
19 #include <linux/interrupt.h>
20 #include <linux/ioport.h>
21 #include <linux/timex.h>
22 #include <linux/slab.h>
23 #include <linux/random.h>
24 #include <linux/bitops.h>
25 #include <asm/bootinfo.h>
27 #include <asm/bitops.h>
28 #include <asm/mipsregs.h>
29 #include <asm/system.h>
30 #include <asm/irq_cpu.h>
31 #include <asm/gt64120.h>
33 asmlinkage void plat_irq_dispatch(void)
35 unsigned int pending = read_c0_status() & read_c0_cause();
37 if (pending & STATUSF_IP7)
38 do_IRQ(WRPPMC_MIPS_TIMER_IRQ); /* CPU Compare/Count internal timer */
39 else if (pending & STATUSF_IP6)
40 do_IRQ(WRPPMC_UART16550_IRQ); /* UART 16550 port */
41 else if (pending & STATUSF_IP3)
42 do_IRQ(WRPPMC_PCI_INTA_IRQ); /* PCI INT_A */
48 * Initialize GT64120 Interrupt Controller
50 void gt64120_init_pic(void)
52 /* clear CPU Interrupt Cause Registers */
53 GT_WRITE(GT_INTRCAUSE_OFS, (0x1F << 21));
54 GT_WRITE(GT_HINTRCAUSE_OFS, 0x00);
56 /* Disable all interrupts from GT64120 bridge chip */
57 GT_WRITE(GT_INTRMASK_OFS, 0x00);
58 GT_WRITE(GT_HINTRMASK_OFS, 0x00);
59 GT_WRITE(GT_PCI0_ICMASK_OFS, 0x00);
60 GT_WRITE(GT_PCI0_HICMASK_OFS, 0x00);
63 void __init arch_init_irq(void)
65 /* IRQ 0 - 7 are for MIPS common irq_cpu controller */