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/gpio.h>
24 #include <mach/regs-intc.h>
28 #define IRQ_BIT(n) (((n) - PXA_IRQ(0)) & 0x1f)
29 #define _ICMR(n) (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICMR2 : &ICMR))
30 #define _ICLR(n) (*((((n) - PXA_IRQ(0)) & ~0x1f) ? &ICLR2 : &ICLR))
33 * This is for peripheral IRQs internal to the PXA chip.
36 static int pxa_internal_irq_nr;
38 static void pxa_mask_irq(unsigned int irq)
40 _ICMR(irq) &= ~(1 << IRQ_BIT(irq));
43 static void pxa_unmask_irq(unsigned int irq)
45 _ICMR(irq) |= 1 << IRQ_BIT(irq);
48 static struct irq_chip pxa_internal_irq_chip = {
52 .unmask = pxa_unmask_irq,
56 * GPIO IRQs for GPIO 0 and 1
58 static int pxa_set_low_gpio_type(unsigned int irq, unsigned int type)
60 int gpio = irq - IRQ_GPIO0;
62 if (__gpio_is_occupied(gpio)) {
63 pr_err("%s failed: GPIO is configured\n", __func__);
67 if (type & IRQ_TYPE_EDGE_RISING)
68 GRER0 |= GPIO_bit(gpio);
70 GRER0 &= ~GPIO_bit(gpio);
72 if (type & IRQ_TYPE_EDGE_FALLING)
73 GFER0 |= GPIO_bit(gpio);
75 GFER0 &= ~GPIO_bit(gpio);
80 static void pxa_ack_low_gpio(unsigned int irq)
82 GEDR0 = (1 << (irq - IRQ_GPIO0));
85 static void pxa_mask_low_gpio(unsigned int irq)
87 ICMR &= ~(1 << (irq - PXA_IRQ(0)));
90 static void pxa_unmask_low_gpio(unsigned int irq)
92 ICMR |= 1 << (irq - PXA_IRQ(0));
95 static struct irq_chip pxa_low_gpio_chip = {
97 .ack = pxa_ack_low_gpio,
98 .mask = pxa_mask_low_gpio,
99 .unmask = pxa_unmask_low_gpio,
100 .set_type = pxa_set_low_gpio_type,
103 static void __init pxa_init_low_gpio_irq(set_wake_t fn)
107 /* clear edge detection on GPIO 0 and 1 */
112 for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
113 set_irq_chip(irq, &pxa_low_gpio_chip);
114 set_irq_handler(irq, handle_edge_irq);
115 set_irq_flags(irq, IRQF_VALID);
118 pxa_low_gpio_chip.set_wake = fn;
121 void __init pxa_init_irq(int irq_nr, set_wake_t fn)
125 pxa_internal_irq_nr = irq_nr;
127 for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq += 32) {
128 _ICMR(irq) = 0; /* disable all IRQs */
129 _ICLR(irq) = 0; /* all IRQs are IRQ, not FIQ */
132 /* only unmasked interrupts kick us out of idle */
135 for (irq = PXA_IRQ(0); irq < PXA_IRQ(irq_nr); irq++) {
136 set_irq_chip(irq, &pxa_internal_irq_chip);
137 set_irq_handler(irq, handle_level_irq);
138 set_irq_flags(irq, IRQF_VALID);
141 pxa_internal_irq_chip.set_wake = fn;
142 pxa_init_low_gpio_irq(fn);
146 static unsigned long saved_icmr[2];
148 static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
150 int i, irq = PXA_IRQ(0);
152 for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
153 saved_icmr[i] = _ICMR(irq);
160 static int pxa_irq_resume(struct sys_device *dev)
162 int i, irq = PXA_IRQ(0);
164 for (i = 0; irq < PXA_IRQ(pxa_internal_irq_nr); i++, irq += 32) {
165 _ICMR(irq) = saved_icmr[i];
173 #define pxa_irq_suspend NULL
174 #define pxa_irq_resume NULL
177 struct sysdev_class pxa_irq_sysclass = {
179 .suspend = pxa_irq_suspend,
180 .resume = pxa_irq_resume,
183 static int __init pxa_irq_init(void)
185 return sysdev_class_register(&pxa_irq_sysclass);
188 core_initcall(pxa_irq_init);