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linux/arch/arm/mach-sa1100/irq.c

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/*
* linux/arch/arm/mach-sa1100/irq.c
*
* Copyright (C) 1999-2001 Nicolas Pitre
*
* Generic IRQ handling for the SA11x0, GPIO 11-27 IRQ demultiplexing.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/ioport.h>
#include <linux/syscore_ops.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <asm/mach/irq.h>
#include "generic.h"
/*
* SA1100 GPIO edge detection for IRQs:
* IRQs are generated on Falling-Edge, Rising-Edge, or both.
* Use this instead of directly setting GRER/GFER.
*/
static int GPIO_IRQ_rising_edge;
static int GPIO_IRQ_falling_edge;
static int GPIO_IRQ_mask = (1 << 11) - 1;
/*
* To get the GPIO number from an IRQ number
*/
#define GPIO_11_27_IRQ(i) ((i) - 21)
#define GPIO11_27_MASK(irq) (1 << GPIO_11_27_IRQ(irq))
static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
{
unsigned int mask;
if (d->irq <= 10)
mask = 1 << d->irq;
else
mask = GPIO11_27_MASK(d->irq);
if (type == IRQ_TYPE_PROBE) {
if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
return 0;
type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
}
if (type & IRQ_TYPE_EDGE_RISING) {
GPIO_IRQ_rising_edge |= mask;
} else
GPIO_IRQ_rising_edge &= ~mask;
if (type & IRQ_TYPE_EDGE_FALLING) {
GPIO_IRQ_falling_edge |= mask;
} else
GPIO_IRQ_falling_edge &= ~mask;
GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
return 0;
}
/*
* GPIO IRQs must be acknowledged. This is for IRQs from 0 to 10.
*/
static void sa1100_low_gpio_ack(struct irq_data *d)
{
GEDR = (1 << d->irq);
}
static void sa1100_low_gpio_mask(struct irq_data *d)
{
ICMR &= ~(1 << d->irq);
}
static void sa1100_low_gpio_unmask(struct irq_data *d)
{
ICMR |= 1 << d->irq;
}
static int sa1100_low_gpio_wake(struct irq_data *d, unsigned int on)
{
if (on)
PWER |= 1 << d->irq;
else
PWER &= ~(1 << d->irq);
return 0;
}
static struct irq_chip sa1100_low_gpio_chip = {
.name = "GPIO-l",
.irq_ack = sa1100_low_gpio_ack,
.irq_mask = sa1100_low_gpio_mask,
.irq_unmask = sa1100_low_gpio_unmask,
.irq_set_type = sa1100_gpio_type,
.irq_set_wake = sa1100_low_gpio_wake,
};
/*
* IRQ11 (GPIO11 through 27) handler. We enter here with the
* irq_controller_lock held, and IRQs disabled. Decode the IRQ
* and call the handler.
*/
static void
sa1100_high_gpio_handler(unsigned int irq, struct irq_desc *desc)
{
unsigned int mask;
mask = GEDR & 0xfffff800;
do {
/*
* clear down all currently active IRQ sources.
* We will be processing them all.
*/
GEDR = mask;
irq = IRQ_GPIO11;
mask >>= 11;
do {
if (mask & 1)
generic_handle_irq(irq);
mask >>= 1;
irq++;
} while (mask);
mask = GEDR & 0xfffff800;
} while (mask);
}
/*
* Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially.
* In addition, the IRQs are all collected up into one bit in the
* interrupt controller registers.
*/
static void sa1100_high_gpio_ack(struct irq_data *d)
{
unsigned int mask = GPIO11_27_MASK(d->irq);
GEDR = mask;
}
static void sa1100_high_gpio_mask(struct irq_data *d)
{
unsigned int mask = GPIO11_27_MASK(d->irq);
GPIO_IRQ_mask &= ~mask;
GRER &= ~mask;
GFER &= ~mask;
}
static void sa1100_high_gpio_unmask(struct irq_data *d)
{
unsigned int mask = GPIO11_27_MASK(d->irq);
GPIO_IRQ_mask |= mask;
GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
}
static int sa1100_high_gpio_wake(struct irq_data *d, unsigned int on)
{
if (on)
PWER |= GPIO11_27_MASK(d->irq);
else
PWER &= ~GPIO11_27_MASK(d->irq);
return 0;
}
static struct irq_chip sa1100_high_gpio_chip = {
.name = "GPIO-h",
.irq_ack = sa1100_high_gpio_ack,
.irq_mask = sa1100_high_gpio_mask,
.irq_unmask = sa1100_high_gpio_unmask,
.irq_set_type = sa1100_gpio_type,
.irq_set_wake = sa1100_high_gpio_wake,
};
/*
* We don't need to ACK IRQs on the SA1100 unless they're GPIOs
* this is for internal IRQs i.e. from 11 to 31.
*/
static void sa1100_mask_irq(struct irq_data *d)
{
ICMR &= ~(1 << d->irq);
}
static void sa1100_unmask_irq(struct irq_data *d)
{
ICMR |= (1 << d->irq);
}
/*
* Apart form GPIOs, only the RTC alarm can be a wakeup event.
*/
static int sa1100_set_wake(struct irq_data *d, unsigned int on)
{
if (d->irq == IRQ_RTCAlrm) {
if (on)
PWER |= PWER_RTC;
else
PWER &= ~PWER_RTC;
return 0;
}
return -EINVAL;
}
static struct irq_chip sa1100_normal_chip = {
.name = "SC",
.irq_ack = sa1100_mask_irq,
.irq_mask = sa1100_mask_irq,
.irq_unmask = sa1100_unmask_irq,
.irq_set_wake = sa1100_set_wake,
};
static struct resource irq_resource =
DEFINE_RES_MEM_NAMED(0x90050000, SZ_64K, "irqs");
static struct sa1100irq_state {
unsigned int saved;
unsigned int icmr;
unsigned int iclr;
unsigned int iccr;
} sa1100irq_state;
static int sa1100irq_suspend(void)
{
struct sa1100irq_state *st = &sa1100irq_state;
st->saved = 1;
st->icmr = ICMR;
st->iclr = ICLR;
st->iccr = ICCR;
/*
* Disable all GPIO-based interrupts.
*/
ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
IC_GPIO1|IC_GPIO0);
/*
* Set the appropriate edges for wakeup.
*/
GRER = PWER & GPIO_IRQ_rising_edge;
GFER = PWER & GPIO_IRQ_falling_edge;
/*
* Clear any pending GPIO interrupts.
*/
GEDR = GEDR;
return 0;
}
static void sa1100irq_resume(void)
{
struct sa1100irq_state *st = &sa1100irq_state;
if (st->saved) {
ICCR = st->iccr;
ICLR = st->iclr;
GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
ICMR = st->icmr;
}
}
static struct syscore_ops sa1100irq_syscore_ops = {
.suspend = sa1100irq_suspend,
.resume = sa1100irq_resume,
};
static int __init sa1100irq_init_devicefs(void)
{
register_syscore_ops(&sa1100irq_syscore_ops);
return 0;
}
device_initcall(sa1100irq_init_devicefs);
void __init sa1100_init_irq(void)
{
unsigned int irq;
request_resource(&iomem_resource, &irq_resource);
/* disable all IRQs */
ICMR = 0;
/* all IRQs are IRQ, not FIQ */
ICLR = 0;
/* clear all GPIO edge detects */
GFER = 0;
GRER = 0;
GEDR = -1;
/*
* Whatever the doc says, this has to be set for the wait-on-irq
* instruction to work... on a SA1100 rev 9 at least.
*/
ICCR = 1;
for (irq = 0; irq <= 10; irq++) {
irq_set_chip_and_handler(irq, &sa1100_low_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
for (irq = 12; irq <= 31; irq++) {
irq_set_chip_and_handler(irq, &sa1100_normal_chip,
handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
for (irq = 32; irq <= 48; irq++) {
irq_set_chip_and_handler(irq, &sa1100_high_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
/*
* Install handler for GPIO 11-27 edge detect interrupts
*/
irq_set_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
irq_set_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
sa1100_init_gpio();
}
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