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>

drivers/gpio/Makefile

@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
 
 LIB 	:= $(obj)libgpio.a
 
+COBJS-$(CONFIG_KIRKWOOD_GPIO)	+= kw_gpio.o
 COBJS-$(CONFIG_MX31_GPIO)	+= mx31_gpio.o
 COBJS-$(CONFIG_PCA953X)		+= pca953x.o
 

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);
+}

include/asm-arm/arch-kirkwood/gpio.h

@@ -0,0 +1,51 @@
+/*
+ * arch/asm-arm/mach-kirkwood/include/mach/gpio.h
+ *
+ * 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 kernel level irq handling. Took some macros from kernel to
+ * allow build.
+ *
+ * Dieter Kiermaier dk-arm-linux@gmx.de
+ */
+
+#ifndef __KIRKWOOD_GPIO_H
+#define __KIRKWOOD_GPIO_H
+
+/* got from kernel include/linux/kernel.h */
+#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+/* got from kernel include/linux/bitops.h */
+#define BITS_PER_BYTE 8
+#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+
+#define GPIO_MAX		50
+#define GPIO_OFF(pin)		(((pin) >> 5) ? 0x0040 : 0x0000)
+#define GPIO_OUT(pin)		(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x00)
+#define GPIO_IO_CONF(pin)	(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x04)
+#define GPIO_BLINK_EN(pin)	(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x08)
+#define GPIO_IN_POL(pin)	(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x0c)
+#define GPIO_DATA_IN(pin)	(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x10)
+#define GPIO_EDGE_CAUSE(pin)	(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x14)
+#define GPIO_EDGE_MASK(pin)	(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x18)
+#define GPIO_LEVEL_MASK(pin)	(KW_GPIO0_BASE + GPIO_OFF(pin) + 0x1c)
+
+/*
+ * Kirkwood-specific GPIO API
+ */
+int kw_gpio_is_valid(unsigned pin, int mode);
+int kw_gpio_direction_input(unsigned pin);
+int kw_gpio_direction_output(unsigned pin, int value);
+int kw_gpio_get_value(unsigned pin);
+void kw_gpio_set_value(unsigned pin, int value);
+void kw_gpio_set_blink(unsigned pin, int blink);
+void kw_gpio_set_unused(unsigned pin);
+
+#define GPIO_INPUT_OK		(1 << 0)
+#define GPIO_OUTPUT_OK		(1 << 1)
+
+#endif