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/*
* 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/irqchip/chained_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) ((void __iomem *)((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 samsung_gpio_chip **chips;
void (*handler)(unsigned int, struct irq_desc *);
};
static LIST_HEAD(banks);
static int s5p_gpioint_set_type(struct irq_data *d, unsigned int type)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct irq_chip_type *ct = gc->chip_types;
unsigned int shift = (d->irq - gc->irq_base) << 2;
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;
}
gc->type_cache &= ~(0x7 << shift);
gc->type_cache |= type << shift;
writel(gc->type_cache, gc->reg_base + ct->regs.type);
return 0;
}
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;
struct irq_chip *chip = irq_get_chip(irq);
chained_irq_enter(chip, desc);
for (group = 0; group < bank->nr_groups; group++) {
struct samsung_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);
}
}
chained_irq_exit(chip, desc);
}
static __init int s5p_gpioint_add(struct samsung_gpio_chip *chip)
{
static int used_gpioint_groups = 0;
int group = chip->group;
struct s5p_gpioint_bank *b, *bank = NULL;
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
return -ENOMEM;
list_for_each_entry(b, &banks, list) {
if (group >= b->start && group < b->start + b->nr_groups) {
bank = b;
break;
}
}
if (!bank)
return -EINVAL;
if (!bank->handler) {
bank->chips = kzalloc(sizeof(struct samsung_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;
gc = irq_alloc_generic_chip("s5p_gpioint", 1, chip->irq_base,
GPIO_BASE(chip),
handle_level_irq);
if (!gc)
return -ENOMEM;
ct = gc->chip_types;
ct->chip.irq_ack = irq_gc_ack_set_bit;
ct->chip.irq_mask = irq_gc_mask_set_bit;
ct->chip.irq_unmask = irq_gc_mask_clr_bit;
ct->chip.irq_set_type = s5p_gpioint_set_type,
ct->regs.ack = PEND_OFFSET + REG_OFFSET(group - bank->start);
ct->regs.mask = MASK_OFFSET + REG_OFFSET(group - bank->start);
ct->regs.type = CON_OFFSET + REG_OFFSET(group - bank->start);
irq_setup_generic_chip(gc, IRQ_MSK(chip->chip.ngpio),
IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST | IRQ_NOPROBE, 0);
return 0;
}
int __init s5p_register_gpio_interrupt(int pin)
{
struct samsung_gpio_chip *my_chip = samsung_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)
goto success;
/* 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);
goto success;
}
return ret;
success:
my_chip->bitmap_gpio_int |= BIT(offset);
return my_chip->irq_base + offset;
}
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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