2 * Copyright (C) 2010 Scott Nicholas <neutronscott@scottn.us>
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
9 #include <linux/init.h>
10 #include <linux/kernel_stat.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/interrupt.h>
14 #include <linux/slab.h>
15 #include <linux/random.h>
17 #include <linux/irq.h>
18 #include <asm/mipsregs.h>
19 #include <asm/irq_cpu.h>
23 static void adm8668_irq_cascade(void)
28 intsrc = ADM8668_INTC_REG(IRQ_STATUS_REG) & IRQ_MASK;
29 for (i = 0; intsrc; intsrc >>= 1, i++)
37 void plat_irq_dispatch(void)
41 pending = read_c0_cause() & read_c0_status() & ST0_IM;
43 /* timer interrupt, that we renumbered */
44 if (pending & STATUSF_IP7)
45 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
46 if (pending & STATUSF_IP2)
47 adm8668_irq_cascade();
53 static void enable_adm8668_irq(struct irq_data *d)
55 ADM8668_INTC_REG(IRQ_ENABLE_REG) = (1 << d->irq);
59 static void ack_adm8668_irq(struct irq_data *d)
61 ADM8668_INTC_REG(IRQ_DISABLE_REG) = (1 << d->irq);
68 static struct irq_chip adm8668_irq_type = {
70 .irq_ack = ack_adm8668_irq,
71 .irq_mask = ack_adm8668_irq,
72 .irq_unmask = enable_adm8668_irq
78 static void __init init_adm8668_irqs(void)
82 for (i = 0; i <= INT_LVL_MAX; i++)
83 irq_set_chip_and_handler(i, &adm8668_irq_type,
86 /* hw0 is where our interrupts are uh.. interrupted at. */
87 set_c0_status(IE_IRQ0);
93 void __init arch_init_irq(void)