dfa1067996
by 1. wrapping long lines and making comments tidy 2. using IRQ_TYPE_* instead of migration macros __IRQT_* 3. introduce a pr_debug() for the commented printk(KERN_DEBUG ...) stuff Signed-off-by: eric miao <eric.miao@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
357 lines
7.5 KiB
C
357 lines
7.5 KiB
C
/*
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* linux/arch/arm/mach-pxa/irq.c
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*
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* Generic PXA IRQ handling, GPIO IRQ demultiplexing, etc.
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*
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* Author: Nicolas Pitre
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* Created: Jun 15, 2001
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* Copyright: MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/sysdev.h>
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#include <asm/hardware.h>
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#include <asm/irq.h>
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#include <asm/mach/irq.h>
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#include <asm/arch/pxa-regs.h>
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#include "generic.h"
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/*
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* This is for peripheral IRQs internal to the PXA chip.
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*/
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static void pxa_mask_low_irq(unsigned int irq)
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{
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ICMR &= ~(1 << irq);
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}
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static void pxa_unmask_low_irq(unsigned int irq)
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{
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ICMR |= (1 << irq);
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}
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static struct irq_chip pxa_internal_chip_low = {
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.name = "SC",
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.ack = pxa_mask_low_irq,
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.mask = pxa_mask_low_irq,
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.unmask = pxa_unmask_low_irq,
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};
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void __init pxa_init_irq_low(void)
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{
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int irq;
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/* disable all IRQs */
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ICMR = 0;
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/* all IRQs are IRQ, not FIQ */
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ICLR = 0;
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/* only unmasked interrupts kick us out of idle */
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ICCR = 1;
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for (irq = PXA_IRQ(0); irq <= PXA_IRQ(31); irq++) {
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set_irq_chip(irq, &pxa_internal_chip_low);
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set_irq_handler(irq, handle_level_irq);
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set_irq_flags(irq, IRQF_VALID);
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}
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}
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#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
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/*
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* This is for the second set of internal IRQs as found on the PXA27x.
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*/
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static void pxa_mask_high_irq(unsigned int irq)
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{
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ICMR2 &= ~(1 << (irq - 32));
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}
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static void pxa_unmask_high_irq(unsigned int irq)
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{
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ICMR2 |= (1 << (irq - 32));
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}
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static struct irq_chip pxa_internal_chip_high = {
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.name = "SC-hi",
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.ack = pxa_mask_high_irq,
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.mask = pxa_mask_high_irq,
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.unmask = pxa_unmask_high_irq,
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};
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void __init pxa_init_irq_high(void)
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{
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int irq;
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ICMR2 = 0;
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ICLR2 = 0;
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for (irq = PXA_IRQ(32); irq < PXA_IRQ(64); irq++) {
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set_irq_chip(irq, &pxa_internal_chip_high);
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set_irq_handler(irq, handle_level_irq);
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set_irq_flags(irq, IRQF_VALID);
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}
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}
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#endif
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/*
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* PXA GPIO edge detection for IRQs:
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* IRQs are generated on Falling-Edge, Rising-Edge, or both.
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* Use this instead of directly setting GRER/GFER.
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*/
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static long GPIO_IRQ_rising_edge[4];
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static long GPIO_IRQ_falling_edge[4];
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static long GPIO_IRQ_mask[4];
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static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
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{
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int gpio, idx;
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gpio = IRQ_TO_GPIO(irq);
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idx = gpio >> 5;
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if (type == IRQ_TYPE_PROBE) {
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/* Don't mess with enabled GPIOs using preconfigured edges or
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* GPIOs set to alternate function or to output during probe
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*/
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if ((GPIO_IRQ_rising_edge[idx] |
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GPIO_IRQ_falling_edge[idx] |
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GPDR(gpio)) & GPIO_bit(gpio))
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return 0;
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if (GAFR(gpio) & (0x3 << (((gpio) & 0xf)*2)))
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return 0;
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type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
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}
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pxa_gpio_mode(gpio | GPIO_IN);
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if (type & IRQ_TYPE_EDGE_RISING)
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__set_bit(gpio, GPIO_IRQ_rising_edge);
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else
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__clear_bit(gpio, GPIO_IRQ_rising_edge);
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if (type & IRQ_TYPE_EDGE_FALLING)
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__set_bit(gpio, GPIO_IRQ_falling_edge);
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else
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__clear_bit(gpio, GPIO_IRQ_falling_edge);
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GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
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GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
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pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, irq, gpio,
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((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
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((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
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return 0;
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}
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/*
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* GPIO IRQs must be acknowledged. This is for GPIO 0 and 1.
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*/
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static void pxa_ack_low_gpio(unsigned int irq)
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{
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GEDR0 = (1 << (irq - IRQ_GPIO0));
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}
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static void pxa_mask_low_gpio(unsigned int irq)
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{
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ICMR &= ~(1 << (irq - PXA_IRQ(0)));
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}
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static void pxa_unmask_low_gpio(unsigned int irq)
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{
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ICMR |= 1 << (irq - PXA_IRQ(0));
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}
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static struct irq_chip pxa_low_gpio_chip = {
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.name = "GPIO-l",
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.ack = pxa_ack_low_gpio,
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.mask = pxa_mask_low_gpio,
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.unmask = pxa_unmask_low_gpio,
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.set_type = pxa_gpio_irq_type,
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};
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/*
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* Demux handler for GPIO>=2 edge detect interrupts
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*/
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#define GEDR_BITS (sizeof(gedr) * BITS_PER_BYTE)
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static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
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{
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int loop, bit, n;
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unsigned long gedr[4];
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do {
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gedr[0] = GEDR0 & GPIO_IRQ_mask[0] & ~3;
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gedr[1] = GEDR1 & GPIO_IRQ_mask[1];
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gedr[2] = GEDR2 & GPIO_IRQ_mask[2];
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gedr[3] = GEDR3 & GPIO_IRQ_mask[3];
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GEDR0 = gedr[0]; GEDR1 = gedr[1];
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GEDR2 = gedr[2]; GEDR3 = gedr[3];
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loop = 0;
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bit = find_first_bit(gedr, GEDR_BITS);
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while (bit < GEDR_BITS) {
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loop = 1;
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n = PXA_GPIO_IRQ_BASE + bit;
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desc_handle_irq(n, irq_desc + n);
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bit = find_next_bit(gedr, GEDR_BITS, bit + 1);
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}
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} while (loop);
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}
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static void pxa_ack_muxed_gpio(unsigned int irq)
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{
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int gpio = irq - IRQ_GPIO(2) + 2;
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GEDR(gpio) = GPIO_bit(gpio);
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}
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static void pxa_mask_muxed_gpio(unsigned int irq)
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{
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int gpio = irq - IRQ_GPIO(2) + 2;
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__clear_bit(gpio, GPIO_IRQ_mask);
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GRER(gpio) &= ~GPIO_bit(gpio);
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GFER(gpio) &= ~GPIO_bit(gpio);
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}
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static void pxa_unmask_muxed_gpio(unsigned int irq)
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{
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int gpio = irq - IRQ_GPIO(2) + 2;
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int idx = gpio >> 5;
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__set_bit(gpio, GPIO_IRQ_mask);
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GRER(gpio) = GPIO_IRQ_rising_edge[idx] & GPIO_IRQ_mask[idx];
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GFER(gpio) = GPIO_IRQ_falling_edge[idx] & GPIO_IRQ_mask[idx];
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}
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static struct irq_chip pxa_muxed_gpio_chip = {
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.name = "GPIO",
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.ack = pxa_ack_muxed_gpio,
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.mask = pxa_mask_muxed_gpio,
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.unmask = pxa_unmask_muxed_gpio,
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.set_type = pxa_gpio_irq_type,
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};
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void __init pxa_init_irq_gpio(int gpio_nr)
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{
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int irq, i;
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pxa_last_gpio = gpio_nr - 1;
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/* clear all GPIO edge detects */
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for (i = 0; i < gpio_nr; i += 32) {
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GFER(i) = 0;
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GRER(i) = 0;
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GEDR(i) = GEDR(i);
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}
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/* GPIO 0 and 1 must have their mask bit always set */
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GPIO_IRQ_mask[0] = 3;
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for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
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set_irq_chip(irq, &pxa_low_gpio_chip);
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set_irq_handler(irq, handle_edge_irq);
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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}
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for (irq = IRQ_GPIO(2); irq < IRQ_GPIO(gpio_nr); irq++) {
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set_irq_chip(irq, &pxa_muxed_gpio_chip);
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set_irq_handler(irq, handle_edge_irq);
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set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
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}
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/* Install handler for GPIO>=2 edge detect interrupts */
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set_irq_chained_handler(IRQ_GPIO_2_x, pxa_gpio_demux_handler);
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pxa_init_gpio(gpio_nr);
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}
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void __init pxa_init_gpio_set_wake(int (*set_wake)(unsigned int, unsigned int))
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{
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pxa_low_gpio_chip.set_wake = set_wake;
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pxa_muxed_gpio_chip.set_wake = set_wake;
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}
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void __init pxa_init_irq_set_wake(int (*set_wake)(unsigned int, unsigned int))
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{
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pxa_internal_chip_low.set_wake = set_wake;
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#ifdef CONFIG_PXA27x
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pxa_internal_chip_high.set_wake = set_wake;
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#endif
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pxa_init_gpio_set_wake(set_wake);
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}
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#ifdef CONFIG_PM
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static unsigned long saved_icmr[2];
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static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
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{
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switch (dev->id) {
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case 0:
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saved_icmr[0] = ICMR;
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ICMR = 0;
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break;
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#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
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case 1:
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saved_icmr[1] = ICMR2;
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ICMR2 = 0;
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break;
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#endif
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int pxa_irq_resume(struct sys_device *dev)
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{
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switch (dev->id) {
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case 0:
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ICMR = saved_icmr[0];
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ICLR = 0;
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ICCR = 1;
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break;
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#if defined(CONFIG_PXA27x) || defined(CONFIG_PXA3xx)
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case 1:
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ICMR2 = saved_icmr[1];
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ICLR2 = 0;
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break;
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#endif
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default:
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return -EINVAL;
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}
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return 0;
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}
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#else
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#define pxa_irq_suspend NULL
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#define pxa_irq_resume NULL
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#endif
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struct sysdev_class pxa_irq_sysclass = {
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.name = "irq",
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.suspend = pxa_irq_suspend,
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.resume = pxa_irq_resume,
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};
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static int __init pxa_irq_init(void)
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{
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return sysdev_class_register(&pxa_irq_sysclass);
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}
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core_initcall(pxa_irq_init);
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