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/*
* linux/arch/arm/mach-pxa/irq.c
*
* Generic PXA IRQ handling
*
* Author: Nicolas Pitre
* Created: Jun 15, 2001
* Copyright: MontaVista Software Inc.
*
* 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/sysdev.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/gpio.h>
#include "generic.h"
#define IRQ_BASE (void __iomem *)io_p2v(0x40d00000)
#define ICIP (0x000)
#define ICMR (0x004)
#define ICLR (0x008)
#define ICFR (0x00c)
#define ICPR (0x010)
#define ICCR (0x014)
#define ICHP (0x018)
#define IPR(i) (((i) < 32) ? (0x01c + ((i) << 2)) : \
((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) : \
(0x144 + (((i) - 64) << 2)))
#define IPR_VALID (1 << 31)
#define IRQ_BIT(n) (((n) - PXA_IRQ(0)) & 0x1f)
#define MAX_INTERNAL_IRQS 128
/*
* This is for peripheral IRQs internal to the PXA chip.
*/
static int pxa_internal_irq_nr;
static inline int cpu_has_ipr(void)
{
return !cpu_is_pxa25x();
}
static inline void __iomem *irq_base(int i)
{
static unsigned long phys_base[] = {
0x40d00000,
0x40d0009c,
0x40d00130,
};
return (void __iomem *)io_p2v(phys_base[i]);
}
static void pxa_mask_irq(struct irq_data *d)
{
void __iomem *base = irq_data_get_irq_chip_data(d);
uint32_t icmr = __raw_readl(base + ICMR);
icmr &= ~(1 << IRQ_BIT(d->irq));
__raw_writel(icmr, base + ICMR);
}
static void pxa_unmask_irq(struct irq_data *d)
{
void __iomem *base = irq_data_get_irq_chip_data(d);
uint32_t icmr = __raw_readl(base + ICMR);
icmr |= 1 << IRQ_BIT(d->irq);
__raw_writel(icmr, base + ICMR);
}
static struct irq_chip pxa_internal_irq_chip = {
.name = "SC",
.irq_ack = pxa_mask_irq,
.irq_mask = pxa_mask_irq,
.irq_unmask = pxa_unmask_irq,
};
/*
* GPIO IRQs for GPIO 0 and 1
*/
static int pxa_set_low_gpio_type(struct irq_data *d, unsigned int type)
{
int gpio = d->irq - IRQ_GPIO0;
if (__gpio_is_occupied(gpio)) {
pr_err("%s failed: GPIO is configured\n", __func__);
return -EINVAL;
}
if (type & IRQ_TYPE_EDGE_RISING)
GRER0 |= GPIO_bit(gpio);
else
GRER0 &= ~GPIO_bit(gpio);
if (type & IRQ_TYPE_EDGE_FALLING)
GFER0 |= GPIO_bit(gpio);
else
GFER0 &= ~GPIO_bit(gpio);
return 0;
}
static void pxa_ack_low_gpio(struct irq_data *d)
{
GEDR0 = (1 << (d->irq - IRQ_GPIO0));
}
static struct irq_chip pxa_low_gpio_chip = {
.name = "GPIO-l",
.irq_ack = pxa_ack_low_gpio,
.irq_mask = pxa_mask_irq,
.irq_unmask = pxa_unmask_irq,
.irq_set_type = pxa_set_low_gpio_type,
};
static void __init pxa_init_low_gpio_irq(set_wake_t fn)
{
int irq;
/* clear edge detection on GPIO 0 and 1 */
GFER0 &= ~0x3;
GRER0 &= ~0x3;
GEDR0 = 0x3;
for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
irq_set_chip(irq, &pxa_low_gpio_chip);
irq_set_handler(irq, handle_edge_irq);
irq_set_chip_data(irq, irq_base(0));
set_irq_flags(irq, IRQF_VALID);
}
pxa_low_gpio_chip.irq_set_wake = fn;
}
void __init pxa_init_irq(int irq_nr, set_wake_t fn)
{
int irq, i, n;
BUG_ON(irq_nr > MAX_INTERNAL_IRQS);
pxa_internal_irq_nr = irq_nr;
for (n = 0; n < irq_nr; n += 32) {
void __iomem *base = irq_base(n >> 5);
__raw_writel(0, base + ICMR); /* disable all IRQs */
__raw_writel(0, base + ICLR); /* all IRQs are IRQ, not FIQ */
for (i = n; (i < (n + 32)) && (i < irq_nr); i++) {
/* initialize interrupt priority */
if (cpu_has_ipr())
__raw_writel(i | IPR_VALID, IRQ_BASE + IPR(i));
irq = PXA_IRQ(i);
irq_set_chip(irq, &pxa_internal_irq_chip);
irq_set_handler(irq, handle_level_irq);
irq_set_chip_data(irq, base);
set_irq_flags(irq, IRQF_VALID);
}
}
/* only unmasked interrupts kick us out of idle */
__raw_writel(1, irq_base(0) + ICCR);
pxa_internal_irq_chip.irq_set_wake = fn;
pxa_init_low_gpio_irq(fn);
}
#ifdef CONFIG_PM
static unsigned long saved_icmr[MAX_INTERNAL_IRQS/32];
static unsigned long saved_ipr[MAX_INTERNAL_IRQS];
static int pxa_irq_suspend(struct sys_device *dev, pm_message_t state)
{
int i;
for (i = 0; i < pxa_internal_irq_nr / 32; i++) {
void __iomem *base = irq_base(i);
saved_icmr[i] = __raw_readl(base + ICMR);
__raw_writel(0, base + ICMR);
}
if (cpu_has_ipr()) {
for (i = 0; i < pxa_internal_irq_nr; i++)
saved_ipr[i] = __raw_readl(IRQ_BASE + IPR(i));
}
return 0;
}
static int pxa_irq_resume(struct sys_device *dev)
{
int i;
for (i = 0; i < pxa_internal_irq_nr / 32; i++) {
void __iomem *base = irq_base(i);
__raw_writel(saved_icmr[i], base + ICMR);
__raw_writel(0, base + ICLR);
}
if (cpu_has_ipr())
for (i = 0; i < pxa_internal_irq_nr; i++)
__raw_writel(saved_ipr[i], IRQ_BASE + IPR(i));
__raw_writel(1, IRQ_BASE + ICCR);
return 0;
}
#else
#define pxa_irq_suspend NULL
#define pxa_irq_resume NULL
#endif
struct sysdev_class pxa_irq_sysclass = {
.name = "irq",
.suspend = pxa_irq_suspend,
.resume = pxa_irq_resume,
};
static int __init pxa_irq_init(void)
{
return sysdev_class_register(&pxa_irq_sysclass);
}
core_initcall(pxa_irq_init);
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