[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>

1 files changed, 65 insertions, 0 deletions

diff --git a/arch/arm/mach-sa1100/gpio.c b/arch/arm/mach-sa1100/gpio.c
new file mode 100644
index 0000000..372f1f4
--- /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);
+}