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/* linux/arch/arm/plat-s5p/irq-gpioint.c
*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* Author: Kyungmin Park <kyungmin.park@samsung.com>
* Author: Joonyoung Shim <jy0922.shim@samsung.com>
* Author: Marek Szyprowski <m.szyprowski@samsung.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <mach/map.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#define S5P_GPIOREG(x) (S5P_VA_GPIO + (x))
#define GPIOINT_CON_OFFSET 0x700
#define GPIOINT_MASK_OFFSET 0x900
#define GPIOINT_PEND_OFFSET 0xA00
#define GPIOINT_LEVEL_LOW 0x0
#define GPIOINT_LEVEL_HIGH 0x1
#define GPIOINT_EDGE_FALLING 0x2
#define GPIOINT_EDGE_RISING 0x3
#define GPIOINT_EDGE_BOTH 0x4
static struct s3c_gpio_chip *irq_chips[S5P_GPIOINT_GROUP_MAXNR];
static int s5p_gpioint_get_group(unsigned int irq)
{
struct gpio_chip *chip = get_irq_data(irq);
struct s3c_gpio_chip *s3c_chip = container_of(chip,
struct s3c_gpio_chip, chip);
int group;
for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++)
if (s3c_chip == irq_chips[group])
break;
return group;
}
static int s5p_gpioint_get_offset(unsigned int irq)
{
struct gpio_chip *chip = get_irq_data(irq);
struct s3c_gpio_chip *s3c_chip = container_of(chip,
struct s3c_gpio_chip, chip);
return irq - s3c_chip->irq_base;
}
static void s5p_gpioint_ack(unsigned int irq)
{
int group, offset, pend_offset;
unsigned int value;
group = s5p_gpioint_get_group(irq);
offset = s5p_gpioint_get_offset(irq);
pend_offset = group << 2;
value = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
value |= 1 << offset;
__raw_writel(value, S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
}
static void s5p_gpioint_mask(unsigned int irq)
{
int group, offset, mask_offset;
unsigned int value;
group = s5p_gpioint_get_group(irq);
offset = s5p_gpioint_get_offset(irq);
mask_offset = group << 2;
value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
value |= 1 << offset;
__raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
}
static void s5p_gpioint_unmask(unsigned int irq)
{
int group, offset, mask_offset;
unsigned int value;
group = s5p_gpioint_get_group(irq);
offset = s5p_gpioint_get_offset(irq);
mask_offset = group << 2;
value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
value &= ~(1 << offset);
__raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
}
static void s5p_gpioint_mask_ack(unsigned int irq)
{
s5p_gpioint_mask(irq);
s5p_gpioint_ack(irq);
}
static int s5p_gpioint_set_type(unsigned int irq, unsigned int type)
{
int group, offset, con_offset;
unsigned int value;
group = s5p_gpioint_get_group(irq);
offset = s5p_gpioint_get_offset(irq);
con_offset = group << 2;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
type = GPIOINT_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
type = GPIOINT_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
type = GPIOINT_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
type = GPIOINT_LEVEL_HIGH;
break;
case IRQ_TYPE_LEVEL_LOW:
type = GPIOINT_LEVEL_LOW;
break;
case IRQ_TYPE_NONE:
default:
printk(KERN_WARNING "No irq type\n");
return -EINVAL;
}
value = __raw_readl(S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
value &= ~(0x7 << (offset * 0x4));
value |= (type << (offset * 0x4));
__raw_writel(value, S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
return 0;
}
struct irq_chip s5p_gpioint = {
.name = "s5p_gpioint",
.ack = s5p_gpioint_ack,
.mask = s5p_gpioint_mask,
.mask_ack = s5p_gpioint_mask_ack,
.unmask = s5p_gpioint_unmask,
.set_type = s5p_gpioint_set_type,
};
static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
{
int group, offset, pend_offset, mask_offset;
int real_irq;
unsigned int pend, mask;
for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++) {
pend_offset = group << 2;
pend = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) +
pend_offset);
if (!pend)
continue;
mask_offset = group << 2;
mask = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) +
mask_offset);
pend &= ~mask;
for (offset = 0; offset < 8; offset++) {
if (pend & (1 << offset)) {
struct s3c_gpio_chip *chip = irq_chips[group];
if (chip) {
real_irq = chip->irq_base + offset;
generic_handle_irq(real_irq);
}
}
}
}
}
static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
{
static int used_gpioint_groups = 0;
static bool handler_registered = 0;
int irq, group = chip->group;
int i;
if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
return -ENOMEM;
chip->irq_base = S5P_GPIOINT_BASE +
used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
used_gpioint_groups++;
if (!handler_registered) {
set_irq_chained_handler(IRQ_GPIOINT, s5p_gpioint_handler);
handler_registered = 1;
}
irq_chips[group] = chip;
for (i = 0; i < chip->chip.ngpio; i++) {
irq = chip->irq_base + i;
set_irq_chip(irq, &s5p_gpioint);
set_irq_data(irq, &chip->chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID);
}
return 0;
}
int __init s5p_register_gpio_interrupt(int pin)
{
struct s3c_gpio_chip *my_chip = s3c_gpiolib_getchip(pin);
int offset, group;
int ret;
if (!my_chip)
return -EINVAL;
offset = pin - my_chip->chip.base;
group = my_chip->group;
/* check if the group has been already registered */
if (my_chip->irq_base)
return my_chip->irq_base + offset;
/* register gpio group */
ret = s5p_gpioint_add(my_chip);
if (ret == 0) {
printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
group);
return my_chip->irq_base + offset;
}
return ret;
}
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