[U-Boot] [PATCH1/2] Kirkwood: add Marvell Kirkwood gpio driver
Dieter Kiermaier
dk-arm-linux at gmx.de
Mon Jun 29 14:45:08 CEST 2009
Hi again,
Here is my first out of 2 patches which adds gpio support to arch/kirkwood.
Any suggestions?
Cheers,
Dieter
From fcdea0c7bba3c25a1fb183bbcaf6d1a4ec32a157 Mon Sep 17 00:00:00 2001
From: Dieter Kiermaier <dk-arm-linux at gmx.de>
Date: Mon, 29 Jun 2009 14:22:13 +0200
Subject: [PATCH] Kirkwood: add Marvell Kirkwood gpio driver
Signed-off-by: Dieter Kiermaier <dk-arm-linux at gmx.de>
---
drivers/gpio/Makefile | 1 +
drivers/gpio/kw_gpio.c | 151 ++++++++++++++++++++++++++++++++++
include/asm-arm/arch-kirkwood/gpio.h | 51 ++++++++++++
3 files changed, 203 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/kw_gpio.c
create mode 100644 include/asm-arm/arch-kirkwood/gpio.h
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index f10144f..acba56c 100644
--- a/drivers/gpio/Makefile
+++ b/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
diff --git a/drivers/gpio/kw_gpio.c b/drivers/gpio/kw_gpio.c
new file mode 100644
index 0000000..f49d92c
--- /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 at 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);
+}
diff --git a/include/asm-arm/arch-kirkwood/gpio.h b/include/asm-arm/arch-kirkwood/gpio.h
new file mode 100644
index 0000000..688149a
--- /dev/null
+++ b/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 at 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
--
1.5.4.3
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