2 * linux/arch/arm/mach-sa1100/irq.c
4 * Copyright (C) 1999-2001 Nicolas Pitre
6 * Generic IRQ handling for the SA11x0, GPIO 11-27 IRQ demultiplexing.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/irqdomain.h>
18 #include <linux/ioport.h>
19 #include <linux/syscore_ops.h>
21 #include <mach/hardware.h>
22 #include <mach/irqs.h>
23 #include <asm/mach/irq.h>
24 #include <asm/exception.h>
30 * We don't need to ACK IRQs on the SA1100 unless they're GPIOs
31 * this is for internal IRQs i.e. from IRQ LCD to RTCAlrm.
33 static void sa1100_mask_irq(struct irq_data *d)
35 ICMR &= ~BIT(d->hwirq);
38 static void sa1100_unmask_irq(struct irq_data *d)
40 ICMR |= BIT(d->hwirq);
44 * Apart form GPIOs, only the RTC alarm can be a wakeup event.
46 static int sa1100_set_wake(struct irq_data *d, unsigned int on)
48 if (BIT(d->hwirq) == IC_RTCAlrm) {
58 static struct irq_chip sa1100_normal_chip = {
60 .irq_ack = sa1100_mask_irq,
61 .irq_mask = sa1100_mask_irq,
62 .irq_unmask = sa1100_unmask_irq,
63 .irq_set_wake = sa1100_set_wake,
66 static int sa1100_normal_irqdomain_map(struct irq_domain *d,
67 unsigned int irq, irq_hw_number_t hwirq)
69 irq_set_chip_and_handler(irq, &sa1100_normal_chip,
71 set_irq_flags(irq, IRQF_VALID);
76 static struct irq_domain_ops sa1100_normal_irqdomain_ops = {
77 .map = sa1100_normal_irqdomain_map,
78 .xlate = irq_domain_xlate_onetwocell,
81 static struct irq_domain *sa1100_normal_irqdomain;
83 static struct resource irq_resource =
84 DEFINE_RES_MEM_NAMED(0x90050000, SZ_64K, "irqs");
86 static struct sa1100irq_state {
93 static int sa1100irq_suspend(void)
95 struct sa1100irq_state *st = &sa1100irq_state;
103 * Disable all GPIO-based interrupts.
105 ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
106 IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
112 static void sa1100irq_resume(void)
114 struct sa1100irq_state *st = &sa1100irq_state;
124 static struct syscore_ops sa1100irq_syscore_ops = {
125 .suspend = sa1100irq_suspend,
126 .resume = sa1100irq_resume,
129 static int __init sa1100irq_init_devicefs(void)
131 register_syscore_ops(&sa1100irq_syscore_ops);
135 device_initcall(sa1100irq_init_devicefs);
137 static asmlinkage void __exception_irq_entry
138 sa1100_handle_irq(struct pt_regs *regs)
140 uint32_t icip, icmr, mask;
150 handle_domain_irq(sa1100_normal_irqdomain,
151 ffs(mask) - 1, regs);
155 void __init sa1100_init_irq(void)
157 request_resource(&iomem_resource, &irq_resource);
159 /* disable all IRQs */
162 /* all IRQs are IRQ, not FIQ */
166 * Whatever the doc says, this has to be set for the wait-on-irq
167 * instruction to work... on a SA1100 rev 9 at least.
171 sa1100_normal_irqdomain = irq_domain_add_simple(NULL,
173 &sa1100_normal_irqdomain_ops, NULL);
175 set_handle_irq(sa1100_handle_irq);