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 irq_chip pxa_internal_chip_low = {
44 .ack = pxa_mask_low_irq,
45 .mask = pxa_mask_low_irq,
46 .unmask = pxa_unmask_low_irq,
49 #if PXA_INTERNAL_IRQS > 32
52 * This is for the second set of internal IRQs as found on the PXA27x.
55 static void pxa_mask_high_irq(unsigned int irq)
57 ICMR2 &= ~(1 << (irq - 32 + PXA_IRQ_SKIP));
60 static void pxa_unmask_high_irq(unsigned int irq)
62 ICMR2 |= (1 << (irq - 32 + PXA_IRQ_SKIP));
65 static struct irq_chip pxa_internal_chip_high = {
67 .ack = pxa_mask_high_irq,
68 .mask = pxa_mask_high_irq,
69 .unmask = pxa_unmask_high_irq,
75 * PXA GPIO edge detection for IRQs:
76 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
77 * Use this instead of directly setting GRER/GFER.
80 static long GPIO_IRQ_rising_edge[4];
81 static long GPIO_IRQ_falling_edge[4];
82 static long GPIO_IRQ_mask[4];
84 static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
88 gpio = IRQ_TO_GPIO(irq);
91 if (type == IRQT_PROBE) {
92 /* Don't mess with enabled GPIOs using preconfigured edges or
93 GPIOs set to alternate function or to output during probe */
94 if ((GPIO_IRQ_rising_edge[idx] | GPIO_IRQ_falling_edge[idx] | GPDR(gpio)) &
97 if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2)))
99 type = __IRQT_RISEDGE | __IRQT_FALEDGE;
102 /* printk(KERN_DEBUG "IRQ%d (GPIO%d): ", irq, gpio); */
104 pxa_gpio_mode(gpio | GPIO_IN);
106 if (type & __IRQT_RISEDGE) {
107 /* printk("rising "); */
108 __set_bit (gpio, GPIO_IRQ_rising_edge);
110 __clear_bit (gpio, GPIO_IRQ_rising_edge);
112 if (type & __IRQT_FALEDGE) {
113 /* printk("falling "); */
114 __set_bit (gpio, GPIO_IRQ_falling_edge);
116 __clear_bit (gpio, GPIO_IRQ_falling_edge);
118 /* printk("edges\n"); */
120 GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
121 GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
126 * GPIO IRQs must be acknowledged. This is for GPIO 0 and 1.
129 static void pxa_ack_low_gpio(unsigned int irq)
131 GEDR0 = (1 << (irq - IRQ_GPIO0));
134 static struct irq_chip pxa_low_gpio_chip = {
136 .ack = pxa_ack_low_gpio,
137 .mask = pxa_mask_low_irq,
138 .unmask = pxa_unmask_low_irq,
139 .set_type = pxa_gpio_irq_type,
143 * Demux handler for GPIO>=2 edge detect interrupts
146 static void pxa_gpio_demux_handler(unsigned int irq, struct irqdesc *desc,
147 struct pt_regs *regs)
159 desc = irq_desc + irq;
163 desc_handle_irq(irq, desc, regs);
175 desc = irq_desc + irq;
178 desc_handle_irq(irq, desc, regs);
190 desc = irq_desc + irq;
193 desc_handle_irq(irq, desc, regs);
201 #if PXA_LAST_GPIO >= 96
206 desc = irq_desc + irq;
209 desc_handle_irq(irq, desc, regs);
220 static void pxa_ack_muxed_gpio(unsigned int irq)
222 int gpio = irq - IRQ_GPIO(2) + 2;
223 GEDR(gpio) = GPIO_bit(gpio);
226 static void pxa_mask_muxed_gpio(unsigned int irq)
228 int gpio = irq - IRQ_GPIO(2) + 2;
229 __clear_bit(gpio, GPIO_IRQ_mask);
230 GRER(gpio) &= ~GPIO_bit(gpio);
231 GFER(gpio) &= ~GPIO_bit(gpio);
234 static void pxa_unmask_muxed_gpio(unsigned int irq)
236 int gpio = irq - IRQ_GPIO(2) + 2;
238 __set_bit(gpio, GPIO_IRQ_mask);
239 GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
240 GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
243 static struct irq_chip pxa_muxed_gpio_chip = {
245 .ack = pxa_ack_muxed_gpio,
246 .mask = pxa_mask_muxed_gpio,
247 .unmask = pxa_unmask_muxed_gpio,
248 .set_type = pxa_gpio_irq_type,
252 void __init pxa_init_irq(void)
256 /* disable all IRQs */
259 /* all IRQs are IRQ, not FIQ */
262 /* clear all GPIO edge detects */
274 /* And similarly for the extra regs on the PXA27x */
282 /* only unmasked interrupts kick us out of idle */
285 /* GPIO 0 and 1 must have their mask bit always set */
286 GPIO_IRQ_mask[0] = 3;
288 for (irq = PXA_IRQ(PXA_IRQ_SKIP); irq <= PXA_IRQ(31); irq++) {
289 set_irq_chip(irq, &pxa_internal_chip_low);
290 set_irq_handler(irq, do_level_IRQ);
291 set_irq_flags(irq, IRQF_VALID);
294 #if PXA_INTERNAL_IRQS > 32
295 for (irq = PXA_IRQ(32); irq < PXA_IRQ(PXA_INTERNAL_IRQS); irq++) {
296 set_irq_chip(irq, &pxa_internal_chip_high);
297 set_irq_handler(irq, do_level_IRQ);
298 set_irq_flags(irq, IRQF_VALID);
302 for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
303 set_irq_chip(irq, &pxa_low_gpio_chip);
304 set_irq_handler(irq, do_edge_IRQ);
305 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
308 for (irq = IRQ_GPIO(2); irq <= IRQ_GPIO(PXA_LAST_GPIO); irq++) {
309 set_irq_chip(irq, &pxa_muxed_gpio_chip);
310 set_irq_handler(irq, do_edge_IRQ);
311 set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
314 /* Install handler for GPIO>=2 edge detect interrupts */
315 set_irq_chip(IRQ_GPIO_2_x, &pxa_internal_chip_low);
316 set_irq_chained_handler(IRQ_GPIO_2_x, pxa_gpio_demux_handler);