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350 lines
7.1 KiB
350 lines
7.1 KiB
/*
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* linux/arch/arm/mach-sa1100/irq.c
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*
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* Copyright (C) 1999-2001 Nicolas Pitre
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*
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* Generic IRQ handling for the SA11x0, GPIO 11-27 IRQ demultiplexing.
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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/irq.h>
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#include <linux/ioport.h>
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#include <linux/sysdev.h>
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#include <asm/hardware.h>
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#include <asm/mach/irq.h>
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#include "generic.h"
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/*
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* SA1100 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 int GPIO_IRQ_rising_edge;
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static int GPIO_IRQ_falling_edge;
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static int GPIO_IRQ_mask = (1 << 11) - 1;
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/*
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* To get the GPIO number from an IRQ number
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*/
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#define GPIO_11_27_IRQ(i) ((i) - 21)
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#define GPIO11_27_MASK(irq) (1 << GPIO_11_27_IRQ(irq))
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static int sa1100_gpio_type(unsigned int irq, unsigned int type)
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{
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unsigned int mask;
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if (irq <= 10)
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mask = 1 << irq;
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else
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mask = GPIO11_27_MASK(irq);
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if (type == IRQT_PROBE) {
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if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
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return 0;
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type = __IRQT_RISEDGE | __IRQT_FALEDGE;
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}
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if (type & __IRQT_RISEDGE) {
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GPIO_IRQ_rising_edge |= mask;
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} else
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GPIO_IRQ_rising_edge &= ~mask;
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if (type & __IRQT_FALEDGE) {
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GPIO_IRQ_falling_edge |= mask;
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} else
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GPIO_IRQ_falling_edge &= ~mask;
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GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
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GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
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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 IRQs from 0 to 10.
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*/
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static void sa1100_low_gpio_ack(unsigned int irq)
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{
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GEDR = (1 << irq);
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}
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static void sa1100_low_gpio_mask(unsigned int irq)
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{
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ICMR &= ~(1 << irq);
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}
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static void sa1100_low_gpio_unmask(unsigned int irq)
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{
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ICMR |= 1 << irq;
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}
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static int sa1100_low_gpio_wake(unsigned int irq, unsigned int on)
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{
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if (on)
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PWER |= 1 << irq;
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else
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PWER &= ~(1 << irq);
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return 0;
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}
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static struct irq_chip sa1100_low_gpio_chip = {
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.name = "GPIO-l",
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.ack = sa1100_low_gpio_ack,
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.mask = sa1100_low_gpio_mask,
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.unmask = sa1100_low_gpio_unmask,
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.set_type = sa1100_gpio_type,
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.set_wake = sa1100_low_gpio_wake,
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};
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/*
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* IRQ11 (GPIO11 through 27) handler. We enter here with the
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* irq_controller_lock held, and IRQs disabled. Decode the IRQ
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* and call the handler.
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*/
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static void
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sa1100_high_gpio_handler(unsigned int irq, struct irq_desc *desc)
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{
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unsigned int mask;
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mask = GEDR & 0xfffff800;
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do {
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/*
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* clear down all currently active IRQ sources.
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* We will be processing them all.
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*/
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GEDR = mask;
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irq = IRQ_GPIO11;
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desc = irq_desc + irq;
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mask >>= 11;
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do {
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if (mask & 1)
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desc_handle_irq(irq, desc);
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mask >>= 1;
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irq++;
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desc++;
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} while (mask);
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mask = GEDR & 0xfffff800;
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} while (mask);
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}
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/*
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* Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially.
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* In addition, the IRQs are all collected up into one bit in the
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* interrupt controller registers.
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*/
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static void sa1100_high_gpio_ack(unsigned int irq)
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{
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unsigned int mask = GPIO11_27_MASK(irq);
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GEDR = mask;
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}
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static void sa1100_high_gpio_mask(unsigned int irq)
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{
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unsigned int mask = GPIO11_27_MASK(irq);
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GPIO_IRQ_mask &= ~mask;
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GRER &= ~mask;
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GFER &= ~mask;
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}
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static void sa1100_high_gpio_unmask(unsigned int irq)
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{
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unsigned int mask = GPIO11_27_MASK(irq);
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GPIO_IRQ_mask |= mask;
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GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
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GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
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}
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static int sa1100_high_gpio_wake(unsigned int irq, unsigned int on)
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{
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if (on)
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PWER |= GPIO11_27_MASK(irq);
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else
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PWER &= ~GPIO11_27_MASK(irq);
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return 0;
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}
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static struct irq_chip sa1100_high_gpio_chip = {
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.name = "GPIO-h",
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.ack = sa1100_high_gpio_ack,
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.mask = sa1100_high_gpio_mask,
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.unmask = sa1100_high_gpio_unmask,
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.set_type = sa1100_gpio_type,
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.set_wake = sa1100_high_gpio_wake,
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};
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/*
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* We don't need to ACK IRQs on the SA1100 unless they're GPIOs
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* this is for internal IRQs i.e. from 11 to 31.
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*/
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static void sa1100_mask_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 sa1100_unmask_irq(unsigned int irq)
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{
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ICMR |= (1 << irq);
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}
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/*
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* Apart form GPIOs, only the RTC alarm can be a wakeup event.
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*/
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static int sa1100_set_wake(unsigned int irq, unsigned int on)
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{
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if (irq == IRQ_RTCAlrm) {
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if (on)
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PWER |= PWER_RTC;
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else
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PWER &= ~PWER_RTC;
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return 0;
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}
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return -EINVAL;
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}
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static struct irq_chip sa1100_normal_chip = {
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.name = "SC",
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.ack = sa1100_mask_irq,
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.mask = sa1100_mask_irq,
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.unmask = sa1100_unmask_irq,
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.set_wake = sa1100_set_wake,
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};
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static struct resource irq_resource = {
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.name = "irqs",
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.start = 0x90050000,
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.end = 0x9005ffff,
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};
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static struct sa1100irq_state {
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unsigned int saved;
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unsigned int icmr;
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unsigned int iclr;
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unsigned int iccr;
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} sa1100irq_state;
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static int sa1100irq_suspend(struct sys_device *dev, pm_message_t state)
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{
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struct sa1100irq_state *st = &sa1100irq_state;
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st->saved = 1;
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st->icmr = ICMR;
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st->iclr = ICLR;
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st->iccr = ICCR;
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/*
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* Disable all GPIO-based interrupts.
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*/
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ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
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IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
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IC_GPIO1|IC_GPIO0);
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/*
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* Set the appropriate edges for wakeup.
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*/
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GRER = PWER & GPIO_IRQ_rising_edge;
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GFER = PWER & GPIO_IRQ_falling_edge;
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/*
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* Clear any pending GPIO interrupts.
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*/
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GEDR = GEDR;
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return 0;
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}
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static int sa1100irq_resume(struct sys_device *dev)
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{
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struct sa1100irq_state *st = &sa1100irq_state;
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if (st->saved) {
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ICCR = st->iccr;
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ICLR = st->iclr;
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GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
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GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
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ICMR = st->icmr;
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}
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return 0;
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}
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static struct sysdev_class sa1100irq_sysclass = {
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set_kset_name("sa11x0-irq"),
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.suspend = sa1100irq_suspend,
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.resume = sa1100irq_resume,
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};
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static struct sys_device sa1100irq_device = {
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.id = 0,
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.cls = &sa1100irq_sysclass,
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};
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static int __init sa1100irq_init_devicefs(void)
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{
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sysdev_class_register(&sa1100irq_sysclass);
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return sysdev_register(&sa1100irq_device);
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}
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device_initcall(sa1100irq_init_devicefs);
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void __init sa1100_init_irq(void)
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{
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unsigned int irq;
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request_resource(&iomem_resource, &irq_resource);
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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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/* clear all GPIO edge detects */
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GFER = 0;
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GRER = 0;
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GEDR = -1;
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/*
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* Whatever the doc says, this has to be set for the wait-on-irq
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* instruction to work... on a SA1100 rev 9 at least.
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*/
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ICCR = 1;
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for (irq = 0; irq <= 10; irq++) {
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set_irq_chip(irq, &sa1100_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 = 12; irq <= 31; irq++) {
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set_irq_chip(irq, &sa1100_normal_chip);
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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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for (irq = 32; irq <= 48; irq++) {
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set_irq_chip(irq, &sa1100_high_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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/*
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* Install handler for GPIO 11-27 edge detect interrupts
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*/
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set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
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set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
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}
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