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>
15 #include <linux/irq.h>
16 #include <linux/ioport.h>
17 #include <linux/ptrace.h>
18 #include <linux/sysdev.h>
20 #include <asm/hardware.h>
21 #include <asm/mach/irq.h>
27 * SA1100 GPIO edge detection for IRQs:
28 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
29 * Use this instead of directly setting GRER/GFER.
31 static int GPIO_IRQ_rising_edge;
32 static int GPIO_IRQ_falling_edge;
33 static int GPIO_IRQ_mask = (1 << 11) - 1;
36 * To get the GPIO number from an IRQ number
38 #define GPIO_11_27_IRQ(i) ((i) - 21)
39 #define GPIO11_27_MASK(irq) (1 << GPIO_11_27_IRQ(irq))
41 static int sa1100_gpio_type(unsigned int irq, unsigned int type)
48 mask = GPIO11_27_MASK(irq);
50 if (type == IRQT_PROBE) {
51 if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
53 type = __IRQT_RISEDGE | __IRQT_FALEDGE;
56 if (type & __IRQT_RISEDGE) {
57 GPIO_IRQ_rising_edge |= mask;
59 GPIO_IRQ_rising_edge &= ~mask;
60 if (type & __IRQT_FALEDGE) {
61 GPIO_IRQ_falling_edge |= mask;
63 GPIO_IRQ_falling_edge &= ~mask;
65 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
66 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
72 * GPIO IRQs must be acknowledged. This is for IRQs from 0 to 10.
74 static void sa1100_low_gpio_ack(unsigned int irq)
79 static void sa1100_low_gpio_mask(unsigned int irq)
84 static void sa1100_low_gpio_unmask(unsigned int irq)
89 static int sa1100_low_gpio_wake(unsigned int irq, unsigned int on)
98 static struct irq_chip sa1100_low_gpio_chip = {
100 .ack = sa1100_low_gpio_ack,
101 .mask = sa1100_low_gpio_mask,
102 .unmask = sa1100_low_gpio_unmask,
103 .set_type = sa1100_gpio_type,
104 .set_wake = sa1100_low_gpio_wake,
108 * IRQ11 (GPIO11 through 27) handler. We enter here with the
109 * irq_controller_lock held, and IRQs disabled. Decode the IRQ
110 * and call the handler.
113 sa1100_high_gpio_handler(unsigned int irq, struct irqdesc *desc,
114 struct pt_regs *regs)
118 mask = GEDR & 0xfffff800;
121 * clear down all currently active IRQ sources.
122 * We will be processing them all.
127 desc = irq_desc + irq;
131 desc_handle_irq(irq, desc, regs);
137 mask = GEDR & 0xfffff800;
142 * Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially.
143 * In addition, the IRQs are all collected up into one bit in the
144 * interrupt controller registers.
146 static void sa1100_high_gpio_ack(unsigned int irq)
148 unsigned int mask = GPIO11_27_MASK(irq);
153 static void sa1100_high_gpio_mask(unsigned int irq)
155 unsigned int mask = GPIO11_27_MASK(irq);
157 GPIO_IRQ_mask &= ~mask;
163 static void sa1100_high_gpio_unmask(unsigned int irq)
165 unsigned int mask = GPIO11_27_MASK(irq);
167 GPIO_IRQ_mask |= mask;
169 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
170 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
173 static int sa1100_high_gpio_wake(unsigned int irq, unsigned int on)
176 PWER |= GPIO11_27_MASK(irq);
178 PWER &= ~GPIO11_27_MASK(irq);
182 static struct irq_chip sa1100_high_gpio_chip = {
184 .ack = sa1100_high_gpio_ack,
185 .mask = sa1100_high_gpio_mask,
186 .unmask = sa1100_high_gpio_unmask,
187 .set_type = sa1100_gpio_type,
188 .set_wake = sa1100_high_gpio_wake,
192 * We don't need to ACK IRQs on the SA1100 unless they're GPIOs
193 * this is for internal IRQs i.e. from 11 to 31.
195 static void sa1100_mask_irq(unsigned int irq)
200 static void sa1100_unmask_irq(unsigned int irq)
206 * Apart form GPIOs, only the RTC alarm can be a wakeup event.
208 static int sa1100_set_wake(unsigned int irq, unsigned int on)
210 if (irq == IRQ_RTCAlrm) {
220 static struct irq_chip sa1100_normal_chip = {
222 .ack = sa1100_mask_irq,
223 .mask = sa1100_mask_irq,
224 .unmask = sa1100_unmask_irq,
225 .set_wake = sa1100_set_wake,
228 static struct resource irq_resource = {
234 static struct sa1100irq_state {
241 static int sa1100irq_suspend(struct sys_device *dev, pm_message_t state)
243 struct sa1100irq_state *st = &sa1100irq_state;
251 * Disable all GPIO-based interrupts.
253 ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
254 IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
258 * Set the appropriate edges for wakeup.
260 GRER = PWER & GPIO_IRQ_rising_edge;
261 GFER = PWER & GPIO_IRQ_falling_edge;
264 * Clear any pending GPIO interrupts.
271 static int sa1100irq_resume(struct sys_device *dev)
273 struct sa1100irq_state *st = &sa1100irq_state;
279 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
280 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
287 static struct sysdev_class sa1100irq_sysclass = {
288 set_kset_name("sa11x0-irq"),
289 .suspend = sa1100irq_suspend,
290 .resume = sa1100irq_resume,
293 static struct sys_device sa1100irq_device = {
295 .cls = &sa1100irq_sysclass,
298 static int __init sa1100irq_init_devicefs(void)
300 sysdev_class_register(&sa1100irq_sysclass);
301 return sysdev_register(&sa1100irq_device);
304 device_initcall(sa1100irq_init_devicefs);
306 void __init sa1100_init_irq(void)
310 request_resource(&iomem_resource, &irq_resource);
312 /* disable all IRQs */
315 /* all IRQs are IRQ, not FIQ */
318 /* clear all GPIO edge detects */
324 * Whatever the doc says, this has to be set for the wait-on-irq
325 * instruction to work... on a SA1100 rev 9 at least.
329 for (irq = 0; irq <= 10; irq++) {
330 set_irq_chip(irq, &sa1100_low_gpio_chip);
331 set_irq_handler(irq, do_edge_IRQ);
332 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
335 for (irq = 12; irq <= 31; irq++) {
336 set_irq_chip(irq, &sa1100_normal_chip);
337 set_irq_handler(irq, do_level_IRQ);
338 set_irq_flags(irq, IRQF_VALID);
341 for (irq = 32; irq <= 48; irq++) {
342 set_irq_chip(irq, &sa1100_high_gpio_chip);
343 set_irq_handler(irq, do_edge_IRQ);
344 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
348 * Install handler for GPIO 11-27 edge detect interrupts
350 set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
351 set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);