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/* linux/arch/arm/mach-s5pv310/irq-eint.c
*
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* S5PV310 - IRQ EINT support
*
* 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/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/sysdev.h>
#include <linux/gpio.h>
#include <plat/pm.h>
#include <plat/cpu.h>
#include <plat/gpio-cfg.h>
#include <mach/regs-gpio.h>
static DEFINE_SPINLOCK(eint_lock);
static unsigned int eint0_15_data[16];
static unsigned int s5pv310_get_irq_nr(unsigned int number)
{
u32 ret = 0;
switch (number) {
case 0 ... 3:
ret = (number + IRQ_EINT0);
break;
case 4 ... 7:
ret = (number + (IRQ_EINT4 - 4));
break;
case 8 ... 15:
ret = (number + (IRQ_EINT8 - 8));
break;
default:
printk(KERN_ERR "number available : %d\n", number);
}
return ret;
}
static inline void s5pv310_irq_eint_mask(unsigned int irq)
{
u32 mask;
spin_lock(&eint_lock);
mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(irq)));
mask |= eint_irq_to_bit(irq);
__raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(irq)));
spin_unlock(&eint_lock);
}
static void s5pv310_irq_eint_unmask(unsigned int irq)
{
u32 mask;
spin_lock(&eint_lock);
mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(irq)));
mask &= ~(eint_irq_to_bit(irq));
__raw_writel(mask, S5P_EINT_MASK(EINT_REG_NR(irq)));
spin_unlock(&eint_lock);
}
static inline void s5pv310_irq_eint_ack(unsigned int irq)
{
__raw_writel(eint_irq_to_bit(irq), S5P_EINT_PEND(EINT_REG_NR(irq)));
}
static void s5pv310_irq_eint_maskack(unsigned int irq)
{
s5pv310_irq_eint_mask(irq);
s5pv310_irq_eint_ack(irq);
}
static int s5pv310_irq_eint_set_type(unsigned int irq, unsigned int type)
{
int offs = EINT_OFFSET(irq);
int shift;
u32 ctrl, mask;
u32 newvalue = 0;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
newvalue = S5P_IRQ_TYPE_EDGE_RISING;
break;
case IRQ_TYPE_EDGE_FALLING:
newvalue = S5P_IRQ_TYPE_EDGE_FALLING;
break;
case IRQ_TYPE_EDGE_BOTH:
newvalue = S5P_IRQ_TYPE_EDGE_BOTH;
break;
case IRQ_TYPE_LEVEL_LOW:
newvalue = S5P_IRQ_TYPE_LEVEL_LOW;
break;
case IRQ_TYPE_LEVEL_HIGH:
newvalue = S5P_IRQ_TYPE_LEVEL_HIGH;
break;
default:
printk(KERN_ERR "No such irq type %d", type);
return -EINVAL;
}
shift = (offs & 0x7) * 4;
mask = 0x7 << shift;
spin_lock(&eint_lock);
ctrl = __raw_readl(S5P_EINT_CON(EINT_REG_NR(irq)));
ctrl &= ~mask;
ctrl |= newvalue << shift;
__raw_writel(ctrl, S5P_EINT_CON(EINT_REG_NR(irq)));
spin_unlock(&eint_lock);
switch (offs) {
case 0 ... 7:
s3c_gpio_cfgpin(EINT_GPIO_0(offs & 0x7), EINT_MODE);
break;
case 8 ... 15:
s3c_gpio_cfgpin(EINT_GPIO_1(offs & 0x7), EINT_MODE);
break;
case 16 ... 23:
s3c_gpio_cfgpin(EINT_GPIO_2(offs & 0x7), EINT_MODE);
break;
case 24 ... 31:
s3c_gpio_cfgpin(EINT_GPIO_3(offs & 0x7), EINT_MODE);
break;
default:
printk(KERN_ERR "No such irq number %d", offs);
}
return 0;
}
static struct irq_chip s5pv310_irq_eint = {
.name = "s5pv310-eint",
.mask = s5pv310_irq_eint_mask,
.unmask = s5pv310_irq_eint_unmask,
.mask_ack = s5pv310_irq_eint_maskack,
.ack = s5pv310_irq_eint_ack,
.set_type = s5pv310_irq_eint_set_type,
#ifdef CONFIG_PM
.set_wake = s3c_irqext_wake,
#endif
};
/* s5pv310_irq_demux_eint
*
* This function demuxes the IRQ from from EINTs 16 to 31.
* It is designed to be inlined into the specific handler
* s5p_irq_demux_eintX_Y.
*
* Each EINT pend/mask registers handle eight of them.
*/
static inline void s5pv310_irq_demux_eint(unsigned int start)
{
unsigned int irq;
u32 status = __raw_readl(S5P_EINT_PEND(EINT_REG_NR(start)));
u32 mask = __raw_readl(S5P_EINT_MASK(EINT_REG_NR(start)));
status &= ~mask;
status &= 0xff;
while (status) {
irq = fls(status) - 1;
generic_handle_irq(irq + start);
status &= ~(1 << irq);
}
}
static void s5pv310_irq_demux_eint16_31(unsigned int irq, struct irq_desc *desc)
{
s5pv310_irq_demux_eint(IRQ_EINT(16));
s5pv310_irq_demux_eint(IRQ_EINT(24));
}
static void s5pv310_irq_eint0_15(unsigned int irq, struct irq_desc *desc)
{
u32 *irq_data = get_irq_data(irq);
struct irq_chip *chip = get_irq_chip(irq);
chip->mask(irq);
if (chip->ack)
chip->ack(irq);
generic_handle_irq(*irq_data);
chip->unmask(irq);
}
int __init s5pv310_init_irq_eint(void)
{
int irq;
for (irq = 0 ; irq <= 31 ; irq++) {
set_irq_chip(IRQ_EINT(irq), &s5pv310_irq_eint);
set_irq_handler(IRQ_EINT(irq), handle_level_irq);
set_irq_flags(IRQ_EINT(irq), IRQF_VALID);
}
set_irq_chained_handler(IRQ_EINT16_31, s5pv310_irq_demux_eint16_31);
for (irq = 0 ; irq <= 15 ; irq++) {
eint0_15_data[irq] = IRQ_EINT(irq);
set_irq_data(s5pv310_get_irq_nr(irq), &eint0_15_data[irq]);
set_irq_chained_handler(s5pv310_get_irq_nr(irq),
s5pv310_irq_eint0_15);
}
return 0;
}
arch_initcall(s5pv310_init_irq_eint);
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