initial_commit

1 files changed, 91 insertions, 0 deletions

diff --git a/arch/arm/plat-iop/gpio.c b/arch/arm/plat-iop/gpio.c
new file mode 100644
index 00000000..640e498c
--- /dev/null
+++ b/arch/arm/plat-iop/gpio.c
@@ -0,0 +1,91 @@
+/*
+ * arch/arm/plat-iop/gpio.c
+ * GPIO handling for Intel IOP3xx processors.
+ *
+ * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ *
+ * 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/device.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/gpio.h>
+#include <asm/hardware/iop3xx.h>
+
+void gpio_line_config(int line, int direction)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (direction == GPIO_IN) {
+		*IOP3XX_GPOE |= 1 << line;
+	} else if (direction == GPIO_OUT) {
+		*IOP3XX_GPOE &= ~(1 << line);
+	}
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_line_config);
+
+int gpio_line_get(int line)
+{
+	return !!(*IOP3XX_GPID & (1 << line));
+}
+EXPORT_SYMBOL(gpio_line_get);
+
+void gpio_line_set(int line, int value)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (value == GPIO_LOW) {
+		*IOP3XX_GPOD &= ~(1 << line);
+	} else if (value == GPIO_HIGH) {
+		*IOP3XX_GPOD |= 1 << line;
+	}
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_line_set);
+
+static int iop3xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
+{
+	gpio_line_config(gpio, GPIO_IN);
+	return 0;
+}
+
+static int iop3xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
+{
+	gpio_line_set(gpio, level);
+	gpio_line_config(gpio, GPIO_OUT);
+	return 0;
+}
+
+static int iop3xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+	return gpio_line_get(gpio);
+}
+
+static void iop3xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
+{
+	gpio_line_set(gpio, value);
+}
+
+static struct gpio_chip iop3xx_chip = {
+	.label			= "iop3xx",
+	.direction_input	= iop3xx_gpio_direction_input,
+	.get			= iop3xx_gpio_get_value,
+	.direction_output	= iop3xx_gpio_direction_output,
+	.set			= iop3xx_gpio_set_value,
+	.base			= 0,
+	.ngpio			= IOP3XX_N_GPIOS,
+};
+
+static int __init iop3xx_gpio_setup(void)
+{
+	return gpiochip_add(&iop3xx_chip);
+}
+arch_initcall(iop3xx_gpio_setup);