2 * linux/arch/arm/mach-pxa/irq.c
4 * Generic PXA IRQ handling, GPIO IRQ demultiplexing, etc.
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/ptrace.h>
20 #include <asm/hardware.h>
22 #include <asm/mach/irq.h>
23 #include <asm/arch/pxa-regs.h>
29 * This is for peripheral IRQs internal to the PXA chip.
32 static void pxa_mask_low_irq(unsigned int irq)
34 ICMR &= ~(1 << (irq + PXA_IRQ_SKIP));
37 static void pxa_unmask_low_irq(unsigned int irq)
39 ICMR |= (1 << (irq + PXA_IRQ_SKIP));
42 static struct irqchip pxa_internal_chip_low = {
43 .ack = pxa_mask_low_irq,
44 .mask = pxa_mask_low_irq,
45 .unmask = pxa_unmask_low_irq,
48 #if PXA_INTERNAL_IRQS > 32
51 * This is for the second set of internal IRQs as found on the PXA27x.
54 static void pxa_mask_high_irq(unsigned int irq)
56 ICMR2 &= ~(1 << (irq - 32 + PXA_IRQ_SKIP));
59 static void pxa_unmask_high_irq(unsigned int irq)
61 ICMR2 |= (1 << (irq - 32 + PXA_IRQ_SKIP));
64 static struct irqchip pxa_internal_chip_high = {
65 .ack = pxa_mask_high_irq,
66 .mask = pxa_mask_high_irq,
67 .unmask = pxa_unmask_high_irq,
73 * PXA GPIO edge detection for IRQs:
74 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
75 * Use this instead of directly setting GRER/GFER.
78 static long GPIO_IRQ_rising_edge[4];
79 static long GPIO_IRQ_falling_edge[4];
80 static long GPIO_IRQ_mask[4];
82 static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
86 gpio = IRQ_TO_GPIO(irq);
89 if (type == IRQT_PROBE) {
90 /* Don't mess with enabled GPIOs using preconfigured edges or
91 GPIOs set to alternate function during probe */
92 if ((GPIO_IRQ_rising_edge[idx] | GPIO_IRQ_falling_edge[idx]) &
95 if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2)))
97 type = __IRQT_RISEDGE | __IRQT_FALEDGE;
100 /* printk(KERN_DEBUG "IRQ%d (GPIO%d): ", irq, gpio); */
102 pxa_gpio_mode(gpio | GPIO_IN);
104 if (type & __IRQT_RISEDGE) {
105 /* printk("rising "); */
106 __set_bit (gpio, GPIO_IRQ_rising_edge);
108 __clear_bit (gpio, GPIO_IRQ_rising_edge);
110 if (type & __IRQT_FALEDGE) {
111 /* printk("falling "); */
112 __set_bit (gpio, GPIO_IRQ_falling_edge);
114 __clear_bit (gpio, GPIO_IRQ_falling_edge);
116 /* printk("edges\n"); */
118 GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
119 GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
124 * GPIO IRQs must be acknowledged. This is for GPIO 0 and 1.
127 static void pxa_ack_low_gpio(unsigned int irq)
129 GEDR0 = (1 << (irq - IRQ_GPIO0));
132 static struct irqchip pxa_low_gpio_chip = {
133 .ack = pxa_ack_low_gpio,
134 .mask = pxa_mask_low_irq,
135 .unmask = pxa_unmask_low_irq,
136 .set_type = pxa_gpio_irq_type,
140 * Demux handler for GPIO>=2 edge detect interrupts
143 static void pxa_gpio_demux_handler(unsigned int irq, struct irqdesc *desc,
144 struct pt_regs *regs)
156 desc = irq_desc + irq;
160 desc_handle_irq(irq, desc, regs);
172 desc = irq_desc + irq;
175 desc_handle_irq(irq, desc, regs);
187 desc = irq_desc + irq;
190 desc_handle_irq(irq, desc, regs);
198 #if PXA_LAST_GPIO >= 96
203 desc = irq_desc + irq;
206 desc_handle_irq(irq, desc, regs);
217 static void pxa_ack_muxed_gpio(unsigned int irq)
219 int gpio = irq - IRQ_GPIO(2) + 2;
220 GEDR(gpio) = GPIO_bit(gpio);
223 static void pxa_mask_muxed_gpio(unsigned int irq)
225 int gpio = irq - IRQ_GPIO(2) + 2;
226 __clear_bit(gpio, GPIO_IRQ_mask);
227 GRER(gpio) &= ~GPIO_bit(gpio);
228 GFER(gpio) &= ~GPIO_bit(gpio);
231 static void pxa_unmask_muxed_gpio(unsigned int irq)
233 int gpio = irq - IRQ_GPIO(2) + 2;
235 __set_bit(gpio, GPIO_IRQ_mask);
236 GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
237 GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
240 static struct irqchip pxa_muxed_gpio_chip = {
241 .ack = pxa_ack_muxed_gpio,
242 .mask = pxa_mask_muxed_gpio,
243 .unmask = pxa_unmask_muxed_gpio,
244 .set_type = pxa_gpio_irq_type,
248 void __init pxa_init_irq(void)
252 /* disable all IRQs */
255 /* all IRQs are IRQ, not FIQ */
258 /* clear all GPIO edge detects */
270 /* And similarly for the extra regs on the PXA27x */
278 /* only unmasked interrupts kick us out of idle */
281 /* GPIO 0 and 1 must have their mask bit always set */
282 GPIO_IRQ_mask[0] = 3;
284 for (irq = PXA_IRQ(PXA_IRQ_SKIP); irq <= PXA_IRQ(31); irq++) {
285 set_irq_chip(irq, &pxa_internal_chip_low);
286 set_irq_handler(irq, do_level_IRQ);
287 set_irq_flags(irq, IRQF_VALID);
290 #if PXA_INTERNAL_IRQS > 32
291 for (irq = PXA_IRQ(32); irq < PXA_IRQ(PXA_INTERNAL_IRQS); irq++) {
292 set_irq_chip(irq, &pxa_internal_chip_high);
293 set_irq_handler(irq, do_level_IRQ);
294 set_irq_flags(irq, IRQF_VALID);
298 for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
299 set_irq_chip(irq, &pxa_low_gpio_chip);
300 set_irq_handler(irq, do_edge_IRQ);
301 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
304 for (irq = IRQ_GPIO(2); irq <= IRQ_GPIO(PXA_LAST_GPIO); irq++) {
305 set_irq_chip(irq, &pxa_muxed_gpio_chip);
306 set_irq_handler(irq, do_edge_IRQ);
307 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
310 /* Install handler for GPIO>=2 edge detect interrupts */
311 set_irq_chip(IRQ_GPIO_2_x, &pxa_internal_chip_low);
312 set_irq_chained_handler(IRQ_GPIO_2_x, pxa_gpio_demux_handler);