[PATCH v2 1/4] ARM: S5PV210: Add gpio interrupt support
Joonyoung Shim
jy0922.shim at samsung.com
Fri Jun 11 04:33:17 EDT 2010
This patch is to support gpio interrupts on s5pv210.
Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
arch/arm/mach-s5pv210/gpiolib.c | 8 +-
arch/arm/mach-s5pv210/include/mach/irqs.h | 16 ++-
arch/arm/plat-s5p/Makefile | 2 +-
arch/arm/plat-s5p/irq-gpioint.c | 208 ++++++++++++++++++++++++
arch/arm/plat-samsung/include/plat/gpio-core.h | 2 +
5 files changed, 233 insertions(+), 3 deletions(-)
create mode 100644 arch/arm/plat-s5p/irq-gpioint.c
diff --git a/arch/arm/mach-s5pv210/gpiolib.c b/arch/arm/mach-s5pv210/gpiolib.c
index 9ea8972..16d6747 100644
--- a/arch/arm/mach-s5pv210/gpiolib.c
+++ b/arch/arm/mach-s5pv210/gpiolib.c
@@ -150,6 +150,7 @@ static struct s3c_gpio_chip s5pv210_gpio_4bit[] = {
.label = "GPG3",
},
}, {
+ .config = &gpio_cfg_noint,
.chip = {
.base = S5PV210_GPI(0),
.ngpio = S5PV210_GPIO_I_NR,
@@ -245,11 +246,16 @@ static __init int s5pv210_gpiolib_init(void)
{
struct s3c_gpio_chip *chip = s5pv210_gpio_4bit;
int nr_chips = ARRAY_SIZE(s5pv210_gpio_4bit);
+ int gpioint_group = 0;
int i = 0;
for (i = 0; i < nr_chips; i++, chip++) {
- if (chip->config == NULL)
+ if (chip->config == NULL) {
chip->config = &gpio_cfg;
+
+ /* gpio interrupts */
+ s5p_gpioint_add(chip, gpioint_group++);
+ }
if (chip->base == NULL)
chip->base = S5PV210_BANK_BASE(i);
}
diff --git a/arch/arm/mach-s5pv210/include/mach/irqs.h b/arch/arm/mach-s5pv210/include/mach/irqs.h
index 9689537..43baacc 100644
--- a/arch/arm/mach-s5pv210/include/mach/irqs.h
+++ b/arch/arm/mach-s5pv210/include/mach/irqs.h
@@ -121,8 +121,22 @@
#define S5P_EINT_BASE1 (S5P_IRQ_VIC0(0))
#define S5P_EINT_BASE2 (IRQ_VIC_END + 1)
+/* GPIO interrupt */
+#define S5P_GPIOINT_GROUP_NR 22
+#define S5P_GPIOINT_BASE (IRQ_EINT(31) + 1)
+#define S5P_IRQ_GPIOINT(x) (S5P_GPIOINT_BASE + (x))
+
/* Set the default NR_IRQS */
-#define NR_IRQS (IRQ_EINT(31) + 1)
+
+/*
+ * GPIO groups is 27. Each GPIO group can have max 8 GPIO interrupts.
+ *
+ * We should include gpios of all gpio groups from GPIO_A0 until GPIO_J4 to
+ * NR_IRQS because 22 gpio groups having gpio interrupts aren't in order and
+ * are mixed with no interrupt gpio groups, then it can give simple irq
+ * computation of gpio interrupts.
+ */
+#define NR_IRQS (S5P_IRQ_GPIOINT(27 * 8) + 1)
/* Compatibility */
#define IRQ_LCD_FIFO IRQ_LCD0
diff --git a/arch/arm/plat-s5p/Makefile b/arch/arm/plat-s5p/Makefile
index 39c242b..b56b4d3 100644
--- a/arch/arm/plat-s5p/Makefile
+++ b/arch/arm/plat-s5p/Makefile
@@ -15,6 +15,6 @@ obj- :=
obj-y += dev-uart.o
obj-y += cpu.o
obj-y += clock.o
-obj-y += irq.o
+obj-y += irq.o irq-gpioint.o
obj-$(CONFIG_S5P_EXT_INT) += irq-eint.o
diff --git a/arch/arm/plat-s5p/irq-gpioint.c b/arch/arm/plat-s5p/irq-gpioint.c
new file mode 100644
index 0000000..c172e37
--- /dev/null
+++ b/arch/arm/plat-s5p/irq-gpioint.c
@@ -0,0 +1,208 @@
+/*
+ * linux/arch/arm/plat-s5p/irq-gpioint.c
+ *
+ * Copyright (C) 2010 Samsung Electronics Co.Ltd
+ * Author: Kyungmin Park <kyungmin.park at samsung.com>
+ * Author: Joonyoung Shim <jy0922.shim at 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 *s3c_chips[S5P_GPIOINT_GROUP_NR];
+
+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_NR; group++)
+ if (s3c_chip == s3c_chips[group])
+ break;
+
+ return group;
+}
+
+static int s5p_gpioint_get_offset(unsigned int irq)
+{
+ struct gpio_chip *chip = get_irq_data(irq);
+ return irq - S5P_IRQ_GPIOINT(chip->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_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(S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
+ value &= ~(0xf << (offset * 0x4));
+ value |= (type << (offset * 0x4));
+ __raw_writel(value, S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
+
+ return 0;
+}
+
+struct irq_chip s5p_gpioint = {
+ .name = "GPIO",
+ .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_NR; 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)) {
+ real_irq = s3c_chips[group]->chip.base +
+ offset;
+ generic_handle_irq(S5P_IRQ_GPIOINT(real_irq));
+ }
+ }
+ }
+}
+
+void s5p_gpioint_add(struct s3c_gpio_chip *chip, int group)
+{
+ int irq;
+ int i;
+
+ s3c_chips[group] = chip;
+
+ for (i = 0; i < chip->chip.ngpio; i++) {
+ irq = S5P_GPIOINT_BASE + chip->chip.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);
+ }
+}
+
+int __init s5p_gpioint_init(void)
+{
+ /* register gpio interrupt handler */
+ set_irq_chained_handler(IRQ_GPIOINT, s5p_gpioint_handler);
+
+ return 0;
+}
+
+arch_initcall(s5p_gpioint_init);
diff --git a/arch/arm/plat-samsung/include/plat/gpio-core.h b/arch/arm/plat-samsung/include/plat/gpio-core.h
index e358c7d..12ec82c 100644
--- a/arch/arm/plat-samsung/include/plat/gpio-core.h
+++ b/arch/arm/plat-samsung/include/plat/gpio-core.h
@@ -121,6 +121,8 @@ extern void samsung_gpiolib_add_4bit2(struct s3c_gpio_chip *chip);
/* exported for core SoC support to change */
extern struct s3c_gpio_cfg s3c24xx_gpiocfg_default;
+extern void s5p_gpioint_add(struct s3c_gpio_chip *chip, int group);
+
#ifdef CONFIG_S3C_GPIO_TRACK
extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END];
--
1.7.0.4
More information about the linux-arm-kernel
mailing list