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path: root/drivers/gpio/gpio-sa1100.c
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Diffstat (limited to 'drivers/gpio/gpio-sa1100.c')
-rw-r--r--drivers/gpio/gpio-sa1100.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-sa1100.c b/drivers/gpio/gpio-sa1100.c
new file mode 100644
index 000000000000..b6c1f6d80649
--- /dev/null
+++ b/drivers/gpio/gpio-sa1100.c
@@ -0,0 +1,63 @@
+/*
+ * 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/gpio.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <mach/hardware.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);
+}