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linux-sg2042/arch/arm/plat-s5p/irq-gpioint.c

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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 <linux/slab.h>
#include <mach/map.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#define GPIO_BASE(chip) (((unsigned long)(chip)->base) & 0xFFFFF000u)
#define CON_OFFSET 0x700
#define MASK_OFFSET 0x900
#define PEND_OFFSET 0xA00
#define REG_OFFSET(x) ((x) << 2)
struct s5p_gpioint_bank {
struct list_head list;
int start;
int nr_groups;
int irq;
struct s3c_gpio_chip **chips;
void (*handler)(unsigned int, struct irq_desc *);
};
LIST_HEAD(banks);
static int s5p_gpioint_get_offset(struct irq_data *data)
{
struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
return data->irq - chip->irq_base;
}
static void s5p_gpioint_ack(struct irq_data *data)
{
struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
int group, offset, pend_offset;
unsigned int value;
group = chip->group;
offset = s5p_gpioint_get_offset(data);
pend_offset = REG_OFFSET(group);
value = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
value |= BIT(offset);
__raw_writel(value, GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
}
static void s5p_gpioint_mask(struct irq_data *data)
{
struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
int group, offset, mask_offset;
unsigned int value;
group = chip->group;
offset = s5p_gpioint_get_offset(data);
mask_offset = REG_OFFSET(group);
value = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
value |= BIT(offset);
__raw_writel(value, GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
}
static void s5p_gpioint_unmask(struct irq_data *data)
{
struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
int group, offset, mask_offset;
unsigned int value;
group = chip->group;
offset = s5p_gpioint_get_offset(data);
mask_offset = REG_OFFSET(group);
value = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
value &= ~BIT(offset);
__raw_writel(value, GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
}
static void s5p_gpioint_mask_ack(struct irq_data *data)
{
s5p_gpioint_mask(data);
s5p_gpioint_ack(data);
}
static int s5p_gpioint_set_type(struct irq_data *data, unsigned int type)
{
struct s3c_gpio_chip *chip = irq_data_get_irq_handler_data(data);
int group, offset, con_offset;
unsigned int value;
group = chip->group;
offset = s5p_gpioint_get_offset(data);
con_offset = REG_OFFSET(group);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
type = S5P_IRQ_TYPE_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
type = S5P_IRQ_TYPE_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
type = S5P_IRQ_TYPE_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_HIGH:
type = S5P_IRQ_TYPE_LEVEL_HIGH;
break;
case IRQ_TYPE_LEVEL_LOW:
type = S5P_IRQ_TYPE_LEVEL_LOW;
break;
case IRQ_TYPE_NONE:
default:
printk(KERN_WARNING "No irq type\n");
return -EINVAL;
}
value = __raw_readl(GPIO_BASE(chip) + CON_OFFSET + con_offset);
value &= ~(0x7 << (offset * 0x4));
value |= (type << (offset * 0x4));
__raw_writel(value, GPIO_BASE(chip) + CON_OFFSET + con_offset);
return 0;
}
static struct irq_chip s5p_gpioint = {
.name = "s5p_gpioint",
.irq_ack = s5p_gpioint_ack,
.irq_mask = s5p_gpioint_mask,
.irq_mask_ack = s5p_gpioint_mask_ack,
.irq_unmask = s5p_gpioint_unmask,
.irq_set_type = s5p_gpioint_set_type,
};
static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
{
struct s5p_gpioint_bank *bank = irq_get_handler_data(irq);
int group, pend_offset, mask_offset;
unsigned int pend, mask;
for (group = 0; group < bank->nr_groups; group++) {
struct s3c_gpio_chip *chip = bank->chips[group];
if (!chip)
continue;
pend_offset = REG_OFFSET(group);
pend = __raw_readl(GPIO_BASE(chip) + PEND_OFFSET + pend_offset);
if (!pend)
continue;
mask_offset = REG_OFFSET(group);
mask = __raw_readl(GPIO_BASE(chip) + MASK_OFFSET + mask_offset);
pend &= ~mask;
while (pend) {
int offset = fls(pend) - 1;
int real_irq = chip->irq_base + offset;
generic_handle_irq(real_irq);
pend &= ~BIT(offset);
}
}
}
static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
{
static int used_gpioint_groups = 0;
int irq, group = chip->group;
int i;
struct s5p_gpioint_bank *bank = NULL;
if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
return -ENOMEM;
list_for_each_entry(bank, &banks, list) {
if (group >= bank->start &&
group < bank->start + bank->nr_groups)
break;
}
if (!bank)
return -EINVAL;
if (!bank->handler) {
bank->chips = kzalloc(sizeof(struct s3c_gpio_chip *) *
bank->nr_groups, GFP_KERNEL);
if (!bank->chips)
return -ENOMEM;
irq_set_chained_handler(bank->irq, s5p_gpioint_handler);
irq_set_handler_data(bank->irq, bank);
bank->handler = s5p_gpioint_handler;
printk(KERN_INFO "Registered chained gpio int handler for interrupt %d.\n",
bank->irq);
}
/*
* chained GPIO irq has been successfully registered, allocate new gpio
* int group and assign irq nubmers
*/
chip->irq_base = S5P_GPIOINT_BASE +
used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
used_gpioint_groups++;
bank->chips[group - bank->start] = chip;
for (i = 0; i < chip->chip.ngpio; i++) {
irq = chip->irq_base + i;
irq_set_chip(irq, &s5p_gpioint);
irq_set_handler_data(irq, chip);
irq_set_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) {
my_chip->chip.to_irq = samsung_gpiolib_to_irq;
printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
group);
return my_chip->irq_base + offset;
}
return ret;
}
int __init s5p_register_gpioint_bank(int chain_irq, int start, int nr_groups)
{
struct s5p_gpioint_bank *bank;
bank = kzalloc(sizeof(*bank), GFP_KERNEL);
if (!bank)
return -ENOMEM;
bank->start = start;
bank->nr_groups = nr_groups;
bank->irq = chain_irq;
list_add_tail(&bank->list, &banks);
return 0;
}
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