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linux-pinenote/arch/arm/plat-s5pc1xx/irq-gpio.c
Kyungmin Park b0d5217cfb ARM: S5PC1xx: add gpiolib and external/gpio interrupt support 
Add support for gpiolib calls. This is based on the gpiolib implementation
from plat-s3c64xx tree.
Add support for external interrupts for GPIO H banks.
Add support for GPIO interrupts for all banks.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
2009-12-01 01:33:14 +00:00

266 lines
6.7 KiB
C
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/*
* arch/arm/plat-s5pc1xx/irq-gpio.c
*
* Copyright (C) 2009 Samsung Electronics
*
* S5PC1XX - Interrupt handling for IRQ_GPIO${group}(x)
*
* 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/gpio.h>
#include <mach/map.h>
#include <plat/gpio-cfg.h>
#define S5PC1XX_GPIOREG(x) (S5PC1XX_VA_GPIO + (x))
#define CON_OFFSET 0x700
#define MASK_OFFSET 0x900
#define PEND_OFFSET 0xA00
#define CON_OFFSET_2 0xE00
#define MASK_OFFSET_2 0xF00
#define PEND_OFFSET_2 0xF40
#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 int group_to_con_offset(int group)
{
return group << 2;
}
static int group_to_mask_offset(int group)
{
return group << 2;
}
static int group_to_pend_offset(int group)
{
return group << 2;
}
static int s5pc1xx_get_start(unsigned int group)
{
switch (group) {
case 0: return S5PC100_GPIO_A0_START;
case 1: return S5PC100_GPIO_A1_START;
case 2: return S5PC100_GPIO_B_START;
case 3: return S5PC100_GPIO_C_START;
case 4: return S5PC100_GPIO_D_START;
case 5: return S5PC100_GPIO_E0_START;
case 6: return S5PC100_GPIO_E1_START;
case 7: return S5PC100_GPIO_F0_START;
case 8: return S5PC100_GPIO_F1_START;
case 9: return S5PC100_GPIO_F2_START;
case 10: return S5PC100_GPIO_F3_START;
case 11: return S5PC100_GPIO_G0_START;
case 12: return S5PC100_GPIO_G1_START;
case 13: return S5PC100_GPIO_G2_START;
case 14: return S5PC100_GPIO_G3_START;
case 15: return S5PC100_GPIO_I_START;
case 16: return S5PC100_GPIO_J0_START;
case 17: return S5PC100_GPIO_J1_START;
case 18: return S5PC100_GPIO_J2_START;
case 19: return S5PC100_GPIO_J3_START;
case 20: return S5PC100_GPIO_J4_START;
default:
BUG();
}
return -EINVAL;
}
static int s5pc1xx_get_group(unsigned int irq)
{
irq -= S3C_IRQ_GPIO(0);
switch (irq) {
case S5PC100_GPIO_A0_START ... S5PC100_GPIO_A1_START - 1:
return 0;
case S5PC100_GPIO_A1_START ... S5PC100_GPIO_B_START - 1:
return 1;
case S5PC100_GPIO_B_START ... S5PC100_GPIO_C_START - 1:
return 2;
case S5PC100_GPIO_C_START ... S5PC100_GPIO_D_START - 1:
return 3;
case S5PC100_GPIO_D_START ... S5PC100_GPIO_E0_START - 1:
return 4;
case S5PC100_GPIO_E0_START ... S5PC100_GPIO_E1_START - 1:
return 5;
case S5PC100_GPIO_E1_START ... S5PC100_GPIO_F0_START - 1:
return 6;
case S5PC100_GPIO_F0_START ... S5PC100_GPIO_F1_START - 1:
return 7;
case S5PC100_GPIO_F1_START ... S5PC100_GPIO_F2_START - 1:
return 8;
case S5PC100_GPIO_F2_START ... S5PC100_GPIO_F3_START - 1:
return 9;
case S5PC100_GPIO_F3_START ... S5PC100_GPIO_G0_START - 1:
return 10;
case S5PC100_GPIO_G0_START ... S5PC100_GPIO_G1_START - 1:
return 11;
case S5PC100_GPIO_G1_START ... S5PC100_GPIO_G2_START - 1:
return 12;
case S5PC100_GPIO_G2_START ... S5PC100_GPIO_G3_START - 1:
return 13;
case S5PC100_GPIO_G3_START ... S5PC100_GPIO_H0_START - 1:
return 14;
case S5PC100_GPIO_I_START ... S5PC100_GPIO_J0_START - 1:
return 15;
case S5PC100_GPIO_J0_START ... S5PC100_GPIO_J1_START - 1:
return 16;
case S5PC100_GPIO_J1_START ... S5PC100_GPIO_J2_START - 1:
return 17;
case S5PC100_GPIO_J2_START ... S5PC100_GPIO_J3_START - 1:
return 18;
case S5PC100_GPIO_J3_START ... S5PC100_GPIO_J4_START - 1:
return 19;
case S5PC100_GPIO_J4_START ... S5PC100_GPIO_K0_START - 1:
return 20;
default:
BUG();
}
return -EINVAL;
}
static int s5pc1xx_get_offset(unsigned int irq)
{
struct gpio_chip *chip = get_irq_data(irq);
return irq - S3C_IRQ_GPIO(chip->base);
}
static void s5pc1xx_gpioint_ack(unsigned int irq)
{
int group, offset, pend_offset;
unsigned int value;
group = s5pc1xx_get_group(irq);
offset = s5pc1xx_get_offset(irq);
pend_offset = group_to_pend_offset(group);
value = __raw_readl(S5PC1XX_GPIOREG(PEND_OFFSET) + pend_offset);
value |= 1 << offset;
__raw_writel(value, S5PC1XX_GPIOREG(PEND_OFFSET) + pend_offset);
}
static void s5pc1xx_gpioint_mask(unsigned int irq)
{
int group, offset, mask_offset;
unsigned int value;
group = s5pc1xx_get_group(irq);
offset = s5pc1xx_get_offset(irq);
mask_offset = group_to_mask_offset(group);
value = __raw_readl(S5PC1XX_GPIOREG(MASK_OFFSET) + mask_offset);
value |= 1 << offset;
__raw_writel(value, S5PC1XX_GPIOREG(MASK_OFFSET) + mask_offset);
}
static void s5pc1xx_gpioint_unmask(unsigned int irq)
{
int group, offset, mask_offset;
unsigned int value;
group = s5pc1xx_get_group(irq);
offset = s5pc1xx_get_offset(irq);
mask_offset = group_to_mask_offset(group);
value = __raw_readl(S5PC1XX_GPIOREG(MASK_OFFSET) + mask_offset);
value &= ~(1 << offset);
__raw_writel(value, S5PC1XX_GPIOREG(MASK_OFFSET) + mask_offset);
}
static void s5pc1xx_gpioint_mask_ack(unsigned int irq)
{
s5pc1xx_gpioint_mask(irq);
s5pc1xx_gpioint_ack(irq);
}
static int s5pc1xx_gpioint_set_type(unsigned int irq, unsigned int type)
{
int group, offset, con_offset;
unsigned int value;
group = s5pc1xx_get_group(irq);
offset = s5pc1xx_get_offset(irq);
con_offset = group_to_con_offset(group);
switch (type) {
case IRQ_TYPE_NONE:
printk(KERN_WARNING "No irq type\n");
return -EINVAL;
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;
default:
BUG();
}
value = __raw_readl(S5PC1XX_GPIOREG(CON_OFFSET) + con_offset);
value &= ~(0xf << (offset * 0x4));
value |= (type << (offset * 0x4));
__raw_writel(value, S5PC1XX_GPIOREG(CON_OFFSET) + con_offset);
return 0;
}
struct irq_chip s5pc1xx_gpioint = {
.name = "GPIO",
.ack = s5pc1xx_gpioint_ack,
.mask = s5pc1xx_gpioint_mask,
.mask_ack = s5pc1xx_gpioint_mask_ack,
.unmask = s5pc1xx_gpioint_unmask,
.set_type = s5pc1xx_gpioint_set_type,
};
void s5pc1xx_irq_gpioint_handler(unsigned int irq, struct irq_desc *desc)
{
int group, offset, pend_offset, mask_offset;
int real_irq, group_end;
unsigned int pend, mask;
group_end = 21;
for (group = 0; group < group_end; group++) {
pend_offset = group_to_pend_offset(group);
pend = __raw_readl(S5PC1XX_GPIOREG(PEND_OFFSET) + pend_offset);
if (!pend)
continue;
mask_offset = group_to_mask_offset(group);
mask = __raw_readl(S5PC1XX_GPIOREG(MASK_OFFSET) + mask_offset);
pend &= ~mask;
for (offset = 0; offset < 8; offset++) {
if (pend & (1 << offset)) {
real_irq = s5pc1xx_get_start(group) + offset;
generic_handle_irq(S3C_IRQ_GPIO(real_irq));
}
}
}
}
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