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authorDmitry Baryshkov <dbaryshkov@gmail.com>2008-04-10 13:31:47 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-10 15:31:37 +0100
commit45528e38173e7d8c03821850e8fd1ddbf16f2b3d (patch)
tree96ed1a1e340bb28e47d8b4b9e1de4b42e0d12bd6
parentc353faa4b2abd8d5142640b880532c97a0807460 (diff)
[ARM] 4961/1: gpiolib support for SA-1100 architecture
This adds gpiolib support for the SA-1100 arch: - Move all GPIO API functions from generic.c into gpio.c - Convert all gpio functions into gpiolib callbacks. Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/Kconfig1
-rw-r--r--arch/arm/mach-sa1100/Makefile2
-rw-r--r--arch/arm/mach-sa1100/generic.c31
-rw-r--r--arch/arm/mach-sa1100/generic.h1
-rw-r--r--arch/arm/mach-sa1100/gpio.c65
-rw-r--r--arch/arm/mach-sa1100/irq.c2
-rw-r--r--include/asm-arm/arch-sa1100/gpio.h31
7 files changed, 82 insertions, 51 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4039a133006e..1f7c728f5ce5 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -426,6 +426,7 @@ config ARCH_SA1100
select GENERIC_GPIO
select GENERIC_TIME
select HAVE_IDE
+ select HAVE_GPIO_LIB
help
Support for StrongARM 11x0 based boards.
diff --git a/arch/arm/mach-sa1100/Makefile b/arch/arm/mach-sa1100/Makefile
index 7a61e8d33ab7..8e0244631d65 100644
--- a/arch/arm/mach-sa1100/Makefile
+++ b/arch/arm/mach-sa1100/Makefile
@@ -3,7 +3,7 @@
#
# Common support
-obj-y := clock.o generic.o irq.o dma.o time.o #nmi-oopser.o
+obj-y := clock.o generic.o gpio.o irq.o dma.o time.o #nmi-oopser.o
obj-m :=
obj-n :=
obj- :=
diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c
index 5c84c604ed86..0c2fa1c4fb4c 100644
--- a/arch/arm/mach-sa1100/generic.c
+++ b/arch/arm/mach-sa1100/generic.c
@@ -139,37 +139,6 @@ unsigned long long sched_clock(void)
return v;
}
-int gpio_direction_input(unsigned gpio)
-{
- unsigned long flags;
-
- if (gpio > GPIO_MAX)
- return -EINVAL;
-
- local_irq_save(flags);
- GPDR &= ~GPIO_GPIO(gpio);
- local_irq_restore(flags);
- return 0;
-}
-
-EXPORT_SYMBOL(gpio_direction_input);
-
-int gpio_direction_output(unsigned gpio, int value)
-{
- unsigned long flags;
-
- if (gpio > GPIO_MAX)
- return -EINVAL;
-
- local_irq_save(flags);
- gpio_set_value(gpio, value);
- GPDR |= GPIO_GPIO(gpio);
- local_irq_restore(flags);
- return 0;
-}
-
-EXPORT_SYMBOL(gpio_direction_output);
-
/*
* Default power-off for SA1100
*/
diff --git a/arch/arm/mach-sa1100/generic.h b/arch/arm/mach-sa1100/generic.h
index f085d68e568e..793c2e6c991f 100644
--- a/arch/arm/mach-sa1100/generic.h
+++ b/arch/arm/mach-sa1100/generic.h
@@ -9,6 +9,7 @@ struct sys_timer;
extern struct sys_timer sa1100_timer;
extern void __init sa1100_map_io(void);
extern void __init sa1100_init_irq(void);
+extern void __init sa1100_init_gpio(void);
#define SET_BANK(__nr,__start,__size) \
mi->bank[__nr].start = (__start), \
diff --git a/arch/arm/mach-sa1100/gpio.c b/arch/arm/mach-sa1100/gpio.c
new file mode 100644
index 000000000000..372f1f4f54a1
--- /dev/null
+++ b/arch/arm/mach-sa1100/gpio.c
@@ -0,0 +1,65 @@
+/*
+ * linux/arch/arm/mach-sa1100/gpio.c
+ *
+ * Generic SA-1100 GPIO handling
+ *
+ * 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/init.h>
+#include <linux/module.h>
+
+#include <asm/gpio.h>
+#include <asm/hardware.h>
+#include "generic.h"
+
+static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ return GPLR & GPIO_GPIO(offset);
+}
+
+static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ if (value)
+ GPSR = GPIO_GPIO(offset);
+ else
+ GPCR = GPIO_GPIO(offset);
+}
+
+static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ GPDR &= ~GPIO_GPIO(offset);
+ local_irq_restore(flags);
+ return 0;
+}
+
+static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ sa1100_gpio_set(chip, offset, value);
+ GPDR |= GPIO_GPIO(offset);
+ local_irq_restore(flags);
+ return 0;
+}
+
+static struct gpio_chip sa1100_gpio_chip = {
+ .label = "gpio",
+ .direction_input = sa1100_direction_input,
+ .direction_output = sa1100_direction_output,
+ .set = sa1100_gpio_set,
+ .get = sa1100_gpio_get,
+ .base = 0,
+ .ngpio = GPIO_MAX + 1,
+};
+
+void __init sa1100_init_gpio(void)
+{
+ gpiochip_add(&sa1100_gpio_chip);
+}
diff --git a/arch/arm/mach-sa1100/irq.c b/arch/arm/mach-sa1100/irq.c
index 3dc17d7bf38e..fa0403af7eec 100644
--- a/arch/arm/mach-sa1100/irq.c
+++ b/arch/arm/mach-sa1100/irq.c
@@ -347,4 +347,6 @@ void __init sa1100_init_irq(void)
*/
set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
+
+ sa1100_init_gpio();
}
diff --git a/include/asm-arm/arch-sa1100/gpio.h b/include/asm-arm/arch-sa1100/gpio.h
index e7a9d26e22a8..93d3395b102d 100644
--- a/include/asm-arm/arch-sa1100/gpio.h
+++ b/include/asm-arm/arch-sa1100/gpio.h
@@ -26,35 +26,28 @@
#include <asm/hardware.h>
#include <asm/irq.h>
-
-static inline int gpio_request(unsigned gpio, const char *label)
-{
- return 0;
-}
-
-static inline void gpio_free(unsigned gpio)
-{
- return;
-}
-
-extern int gpio_direction_input(unsigned gpio);
-extern int gpio_direction_output(unsigned gpio, int value);
-
+#include <asm-generic/gpio.h>
static inline int gpio_get_value(unsigned gpio)
{
- return GPLR & GPIO_GPIO(gpio);
+ if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
+ return GPLR & GPIO_GPIO(gpio);
+ else
+ return __gpio_get_value(gpio);
}
static inline void gpio_set_value(unsigned gpio, int value)
{
- if (value)
- GPSR = GPIO_GPIO(gpio);
+ if (__builtin_constant_p(gpio) && (gpio <= GPIO_MAX))
+ if (value)
+ GPSR = GPIO_GPIO(gpio);
+ else
+ GPCR = GPIO_GPIO(gpio);
else
- GPCR = GPIO_GPIO(gpio);
+ __gpio_set_value(gpio, value);
}
-#include <asm-generic/gpio.h> /* cansleep wrappers */
+#define gpio_cansleep __gpio_cansleep
static inline unsigned gpio_to_irq(unsigned gpio)
{