Kirkwood: add Marvell Kirkwood gpio driver
Signed-off-by: Dieter Kiermaier <dk-arm-linux@gmx.de>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>
Tested-by: Heiko Schocher <hs@denx.de>
diff --git a/drivers/gpio/kw_gpio.c b/drivers/gpio/kw_gpio.c
new file mode 100644
index 0000000..1c28834
--- /dev/null
+++ b/drivers/gpio/kw_gpio.c
@@ -0,0 +1,151 @@
+/*
+ * arch/arm/plat-orion/gpio.c
+ *
+ * Marvell Orion SoC GPIO handling.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+/*
+ * Based on (mostly copied from) plat-orion based Linux 2.6 kernel driver.
+ * Removed orion_gpiochip struct and kernel level irq handling.
+ *
+ * Dieter Kiermaier dk-arm-linux@gmx.de
+ */
+
+#include <common.h>
+#include <asm/bitops.h>
+#include <asm/arch/kirkwood.h>
+#include <asm/arch/gpio.h>
+
+static unsigned long gpio_valid_input[BITS_TO_LONGS(GPIO_MAX)];
+static unsigned long gpio_valid_output[BITS_TO_LONGS(GPIO_MAX)];
+
+void __set_direction(unsigned pin, int input)
+{
+ u32 u;
+
+ u = readl(GPIO_IO_CONF(pin));
+ if (input)
+ u |= 1 << (pin & 31);
+ else
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_IO_CONF(pin));
+
+ u = readl(GPIO_IO_CONF(pin));
+}
+
+void __set_level(unsigned pin, int high)
+{
+ u32 u;
+
+ u = readl(GPIO_OUT(pin));
+ if (high)
+ u |= 1 << (pin & 31);
+ else
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_OUT(pin));
+}
+
+void __set_blinking(unsigned pin, int blink)
+{
+ u32 u;
+
+ u = readl(GPIO_BLINK_EN(pin));
+ if (blink)
+ u |= 1 << (pin & 31);
+ else
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_BLINK_EN(pin));
+}
+
+int kw_gpio_is_valid(unsigned pin, int mode)
+{
+ if (pin < GPIO_MAX) {
+ if ((mode & GPIO_INPUT_OK) && !test_bit(pin, gpio_valid_input))
+ goto err_out;
+
+ if ((mode & GPIO_OUTPUT_OK) && !test_bit(pin, gpio_valid_output))
+ goto err_out;
+ return 0;
+ }
+
+err_out:
+ printf("%s: invalid GPIO %d\n", __func__, pin);
+ return 1;
+}
+
+void kw_gpio_set_valid(unsigned pin, int mode)
+{
+ if (mode == 1)
+ mode = GPIO_INPUT_OK | GPIO_OUTPUT_OK;
+ if (mode & GPIO_INPUT_OK)
+ __set_bit(pin, gpio_valid_input);
+ else
+ __clear_bit(pin, gpio_valid_input);
+ if (mode & GPIO_OUTPUT_OK)
+ __set_bit(pin, gpio_valid_output);
+ else
+ __clear_bit(pin, gpio_valid_output);
+}
+/*
+ * GENERIC_GPIO primitives.
+ */
+int kw_gpio_direction_input(unsigned pin)
+{
+ if (!kw_gpio_is_valid(pin, GPIO_INPUT_OK))
+ return 1;
+
+ /* Configure GPIO direction. */
+ __set_direction(pin, 1);
+
+ return 0;
+}
+
+int kw_gpio_direction_output(unsigned pin, int value)
+{
+ if (kw_gpio_is_valid(pin, GPIO_OUTPUT_OK) != 0)
+ {
+ printf("%s: invalid GPIO %d\n", __func__, pin);
+ return 1;
+ }
+
+ __set_blinking(pin, 0);
+
+ /* Configure GPIO output value. */
+ __set_level(pin, value);
+
+ /* Configure GPIO direction. */
+ __set_direction(pin, 0);
+
+ return 0;
+}
+
+int kw_gpio_get_value(unsigned pin)
+{
+ int val;
+
+ if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31)))
+ val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin));
+ else
+ val = readl(GPIO_OUT(pin));
+
+ return (val >> (pin & 31)) & 1;
+}
+
+void kw_gpio_set_value(unsigned pin, int value)
+{
+ /* Configure GPIO output value. */
+ __set_level(pin, value);
+}
+
+void kw_gpio_set_blink(unsigned pin, int blink)
+{
+ /* Set output value to zero. */
+ __set_level(pin, 0);
+
+ /* Set blinking. */
+ __set_blinking(pin, blink);
+}