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/ioport.h>
15 #include <linux/ptrace.h>
16 #include <linux/sysdev.h>
18 #include <asm/hardware.h>
20 #include <asm/mach/irq.h>
26 * SA1100 GPIO edge detection for IRQs:
27 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
28 * Use this instead of directly setting GRER/GFER.
30 static int GPIO_IRQ_rising_edge;
31 static int GPIO_IRQ_falling_edge;
32 static int GPIO_IRQ_mask = (1 << 11) - 1;
35 * To get the GPIO number from an IRQ number
37 #define GPIO_11_27_IRQ(i) ((i) - 21)
38 #define GPIO11_27_MASK(irq) (1 << GPIO_11_27_IRQ(irq))
40 static int sa1100_gpio_type(unsigned int irq, unsigned int type)
47 mask = GPIO11_27_MASK(irq);
49 if (type == IRQT_PROBE) {
50 if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
52 type = __IRQT_RISEDGE | __IRQT_FALEDGE;
55 if (type & __IRQT_RISEDGE) {
56 GPIO_IRQ_rising_edge |= mask;
58 GPIO_IRQ_rising_edge &= ~mask;
59 if (type & __IRQT_FALEDGE) {
60 GPIO_IRQ_falling_edge |= mask;
62 GPIO_IRQ_falling_edge &= ~mask;
64 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
65 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
71 * GPIO IRQs must be acknowledged. This is for IRQs from 0 to 10.
73 static void sa1100_low_gpio_ack(unsigned int irq)
78 static void sa1100_low_gpio_mask(unsigned int irq)
83 static void sa1100_low_gpio_unmask(unsigned int irq)
88 static int sa1100_low_gpio_wake(unsigned int irq, unsigned int on)
97 static struct irqchip sa1100_low_gpio_chip = {
98 .ack = sa1100_low_gpio_ack,
99 .mask = sa1100_low_gpio_mask,
100 .unmask = sa1100_low_gpio_unmask,
101 .set_type = sa1100_gpio_type,
102 .set_wake = sa1100_low_gpio_wake,
106 * IRQ11 (GPIO11 through 27) handler. We enter here with the
107 * irq_controller_lock held, and IRQs disabled. Decode the IRQ
108 * and call the handler.
111 sa1100_high_gpio_handler(unsigned int irq, struct irqdesc *desc,
112 struct pt_regs *regs)
116 mask = GEDR & 0xfffff800;
119 * clear down all currently active IRQ sources.
120 * We will be processing them all.
125 desc = irq_desc + irq;
129 desc_handle_irq(irq, desc, regs);
135 mask = GEDR & 0xfffff800;
140 * Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially.
141 * In addition, the IRQs are all collected up into one bit in the
142 * interrupt controller registers.
144 static void sa1100_high_gpio_ack(unsigned int irq)
146 unsigned int mask = GPIO11_27_MASK(irq);
151 static void sa1100_high_gpio_mask(unsigned int irq)
153 unsigned int mask = GPIO11_27_MASK(irq);
155 GPIO_IRQ_mask &= ~mask;
161 static void sa1100_high_gpio_unmask(unsigned int irq)
163 unsigned int mask = GPIO11_27_MASK(irq);
165 GPIO_IRQ_mask |= mask;
167 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
168 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
171 static int sa1100_high_gpio_wake(unsigned int irq, unsigned int on)
174 PWER |= GPIO11_27_MASK(irq);
176 PWER &= ~GPIO11_27_MASK(irq);
180 static struct irqchip sa1100_high_gpio_chip = {
181 .ack = sa1100_high_gpio_ack,
182 .mask = sa1100_high_gpio_mask,
183 .unmask = sa1100_high_gpio_unmask,
184 .set_type = sa1100_gpio_type,
185 .set_wake = sa1100_high_gpio_wake,
189 * We don't need to ACK IRQs on the SA1100 unless they're GPIOs
190 * this is for internal IRQs i.e. from 11 to 31.
192 static void sa1100_mask_irq(unsigned int irq)
197 static void sa1100_unmask_irq(unsigned int irq)
203 * Apart form GPIOs, only the RTC alarm can be a wakeup event.
205 static int sa1100_set_wake(unsigned int irq, unsigned int on)
207 if (irq == IRQ_RTCAlrm) {
217 static struct irqchip sa1100_normal_chip = {
218 .ack = sa1100_mask_irq,
219 .mask = sa1100_mask_irq,
220 .unmask = sa1100_unmask_irq,
221 .set_wake = sa1100_set_wake,
224 static struct resource irq_resource = {
230 static struct sa1100irq_state {
237 static int sa1100irq_suspend(struct sys_device *dev, pm_message_t state)
239 struct sa1100irq_state *st = &sa1100irq_state;
247 * Disable all GPIO-based interrupts.
249 ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
250 IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
254 * Set the appropriate edges for wakeup.
256 GRER = PWER & GPIO_IRQ_rising_edge;
257 GFER = PWER & GPIO_IRQ_falling_edge;
260 * Clear any pending GPIO interrupts.
267 static int sa1100irq_resume(struct sys_device *dev)
269 struct sa1100irq_state *st = &sa1100irq_state;
275 GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
276 GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
283 static struct sysdev_class sa1100irq_sysclass = {
284 set_kset_name("sa11x0-irq"),
285 .suspend = sa1100irq_suspend,
286 .resume = sa1100irq_resume,
289 static struct sys_device sa1100irq_device = {
291 .cls = &sa1100irq_sysclass,
294 static int __init sa1100irq_init_devicefs(void)
296 sysdev_class_register(&sa1100irq_sysclass);
297 return sysdev_register(&sa1100irq_device);
300 device_initcall(sa1100irq_init_devicefs);
302 void __init sa1100_init_irq(void)
306 request_resource(&iomem_resource, &irq_resource);
308 /* disable all IRQs */
311 /* all IRQs are IRQ, not FIQ */
314 /* clear all GPIO edge detects */
320 * Whatever the doc says, this has to be set for the wait-on-irq
321 * instruction to work... on a SA1100 rev 9 at least.
325 for (irq = 0; irq <= 10; irq++) {
326 set_irq_chip(irq, &sa1100_low_gpio_chip);
327 set_irq_handler(irq, do_edge_IRQ);
328 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
331 for (irq = 12; irq <= 31; irq++) {
332 set_irq_chip(irq, &sa1100_normal_chip);
333 set_irq_handler(irq, do_level_IRQ);
334 set_irq_flags(irq, IRQF_VALID);
337 for (irq = 32; irq <= 48; irq++) {
338 set_irq_chip(irq, &sa1100_high_gpio_chip);
339 set_irq_handler(irq, do_edge_IRQ);
340 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
344 * Install handler for GPIO 11-27 edge detect interrupts
346 set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
347 set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);