2 * linux/arch/arm/mach-pxa/irq.c
4 * Generic PXA IRQ handling
6 * Author: Nicolas Pitre
7 * Created: Jun 15, 2001
8 * Copyright: MontaVista Software Inc.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/interrupt.h>
18 #include <linux/sysdev.h>
20 #include <mach/hardware.h>
22 #include <asm/mach/irq.h>
23 #include <mach/pxa-regs.h>
27 #define IRQ_BIT(n) (((n) - PXA_IRQ(0)) & 0x1f)
28 #define _ICMR(n) (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICMR2 : &ICMR))
29 #define _ICLR(n) (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICLR2 : &ICLR))
32 * This is for peripheral IRQs internal to the PXA chip.
35 static int pxa_internal_irq_nr;
37 static void pxa_mask_irq(unsigned int irq)
39 _ICMR(irq) &= ~(1 << IRQ_BIT(irq));
42 static void pxa_unmask_irq(unsigned int irq)
44 _ICMR(irq) |= 1 << IRQ_BIT(irq);
47 static struct irq_chip pxa_internal_irq_chip = {
51 .unmask = pxa_unmask_irq,
54 void __init pxa_init_irq(int irq_nr, set_wake_t fn)
58 pxa_internal_irq_nr = irq_nr;
60 for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq += 32) {
61 _ICMR(irq) = 0; /* disable all IRQs */
62 _ICLR(irq) = 0; /* all IRQs are IRQ, not FIQ */
65 /* only unmasked interrupts kick us out of idle */
68 for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq++) {
69 set_irq_chip(irq, &pxa_internal_irq_chip);
70 set_irq_handler(irq, handle_level_irq);
71 set_irq_flags(irq, IRQF_VALID);
74 pxa_internal_irq_chip.set_wake = fn;
78 static unsigned long saved_icmr[2];
80 static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
82 int i, irq = PXA_IRQ(0);
84 for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
85 saved_icmr[i] = _ICMR(irq);
92 static int pxa_irq_resume(struct sys_device *dev)
94 int i, irq = PXA_IRQ(0);
96 for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
97 _ICMR(irq) = saved_icmr[i];
105 #define pxa_irq_suspend NULL
106 #define pxa_irq_resume NULL
109 struct sysdev_class pxa_irq_sysclass = {
111 .suspend = pxa_irq_suspend,
112 .resume = pxa_irq_resume,
115 static int __init pxa_irq_init(void)
117 return sysdev_class_register(&pxa_irq_sysclass);
120 core_initcall(pxa_irq_init);