1 /*
2 * IRQ vector handles
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle
9 */
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/irq.h>
13 #include <linux/interrupt.h>
14 #include <linux/pci.h>
15
16 #include <asm/i8259.h>
17 #include <asm/irq_cpu.h>
18 #include <asm/irq_gt641xx.h>
19 #include <asm/gt64120.h>
20
21 #include <irq.h>
22
plat_irq_dispatch(void)23 asmlinkage void plat_irq_dispatch(void)
24 {
25 unsigned pending = read_c0_status() & read_c0_cause() & ST0_IM;
26 int irq;
27
28 if (pending & CAUSEF_IP2)
29 gt641xx_irq_dispatch();
30 else if (pending & CAUSEF_IP6) {
31 irq = i8259_irq();
32 if (irq < 0)
33 spurious_interrupt();
34 else
35 do_IRQ(irq);
36 } else if (pending & CAUSEF_IP3)
37 do_IRQ(MIPS_CPU_IRQ_BASE + 3);
38 else if (pending & CAUSEF_IP4)
39 do_IRQ(MIPS_CPU_IRQ_BASE + 4);
40 else if (pending & CAUSEF_IP5)
41 do_IRQ(MIPS_CPU_IRQ_BASE + 5);
42 else if (pending & CAUSEF_IP7)
43 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
44 else
45 spurious_interrupt();
46 }
47
arch_init_irq(void)48 void __init arch_init_irq(void)
49 {
50 mips_cpu_irq_init();
51 gt641xx_irq_init();
52 init_i8259_irqs();
53
54 if (request_irq(GT641XX_CASCADE_IRQ, no_action, IRQF_NO_THREAD,
55 "cascade", NULL)) {
56 pr_err("Failed to request irq %d (cascade)\n",
57 GT641XX_CASCADE_IRQ);
58 }
59 if (request_irq(I8259_CASCADE_IRQ, no_action, IRQF_NO_THREAD,
60 "cascade", NULL)) {
61 pr_err("Failed to request irq %d (cascade)\n",
62 I8259_CASCADE_IRQ);
63 }
64 }
65