160 lines
4.3 KiB
Diff
160 lines
4.3 KiB
Diff
From: Imre Kaloz <kaloz@openwrt.org>
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Subject: [RFC/PATCH] ARM: ixp4xx gpiolib support
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Date: Mon, 5 Sep 2011 14:49:51 +0200
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This patch adds gpiolib support for the IXP4xx platform
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Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
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[bwh: Forward-ported to 3.4]
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---
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arch/arm/Kconfig | 2 +-
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arch/arm/mach-ixp4xx/common.c | 39 +++++++++++++++++++++++++
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arch/arm/mach-ixp4xx/include/mach/gpio.h | 46 ++++++++++--------------------
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3 files changed, 55 insertions(+), 32 deletions(-)
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Index: source_armel_none/arch/arm/Kconfig
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===================================================================
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--- source_armel_none.orig/arch/arm/Kconfig 2012-01-07 20:47:15.000000000 +0100
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+++ source_armel_none/arch/arm/Kconfig 2012-01-07 20:51:00.390593917 +0100
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@@ -520,7 +520,7 @@ config ARCH_IXP4XX
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select ARCH_HAS_DMA_SET_COHERENT_MASK
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select CLKSRC_MMIO
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select CPU_XSCALE
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- select GENERIC_GPIO
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+ select ARCH_REQUIRE_GPIOLIB
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select GENERIC_CLOCKEVENTS
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select MIGHT_HAVE_PCI
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select NEED_MACH_IO_H
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Index: source_armel_none/arch/arm/mach-ixp4xx/common.c
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===================================================================
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--- source_armel_none.orig/arch/arm/mach-ixp4xx/common.c 2012-01-07 20:47:15.000000000 +0100
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+++ source_armel_none/arch/arm/mach-ixp4xx/common.c 2012-01-07 20:51:00.390593917 +0100
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@@ -37,6 +37,7 @@
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#include <asm/irq.h>
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#include <asm/sched_clock.h>
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#include <asm/system_misc.h>
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+#include <asm/gpio.h>
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#include <asm/mach/map.h>
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#include <asm/mach/irq.h>
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@@ -376,12 +377,50 @@ static struct platform_device *ixp46x_de
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unsigned long ixp4xx_exp_bus_size;
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EXPORT_SYMBOL(ixp4xx_exp_bus_size);
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+static int ixp4xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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+{
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+ gpio_line_config(gpio, IXP4XX_GPIO_IN);
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+ return 0;
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+}
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+
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+static int ixp4xx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
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+{
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+ gpio_line_set(gpio, level);
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+ gpio_line_config(gpio, IXP4XX_GPIO_OUT);
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+ return 0;
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+}
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+
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+static int ixp4xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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+{
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+ int value;
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+
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+ gpio_line_get(gpio, &value);
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+ return value;
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+}
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+
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+static void ixp4xx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
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+{
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+ gpio_line_set(gpio, value);
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+}
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+
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+static struct gpio_chip ixp4xx_gpio_chip = {
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+ .label = "IXP4XX_GPIO_CHIP",
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+ .direction_input = ixp4xx_gpio_direction_input,
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+ .direction_output = ixp4xx_gpio_direction_output,
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+ .get = ixp4xx_gpio_get_value,
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+ .set = ixp4xx_gpio_set_value,
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+ .base = 0,
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+ .ngpio = 16,
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+};
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+
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void __init ixp4xx_sys_init(void)
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{
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ixp4xx_exp_bus_size = SZ_16M;
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platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
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+ gpiochip_add(&ixp4xx_gpio_chip);
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+
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if (cpu_is_ixp46x()) {
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int region;
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Index: source_armel_none/arch/arm/mach-ixp4xx/include/mach/gpio.h
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===================================================================
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--- source_armel_none.orig/arch/arm/mach-ixp4xx/include/mach/gpio.h 2012-01-07 20:47:15.000000000 +0100
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+++ source_armel_none/arch/arm/mach-ixp4xx/include/mach/gpio.h 2012-01-07 20:51:00.390593917 +0100
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@@ -27,49 +27,33 @@
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#include <linux/kernel.h>
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#include <mach/hardware.h>
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+#include <asm-generic/gpio.h> /* cansleep wrappers */
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#define __ARM_GPIOLIB_COMPLEX
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-static inline int gpio_request(unsigned gpio, const char *label)
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-{
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- return 0;
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-}
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-
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-static inline void gpio_free(unsigned gpio)
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-{
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- might_sleep();
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-
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- return;
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-}
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-
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-static inline int gpio_direction_input(unsigned gpio)
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-{
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- gpio_line_config(gpio, IXP4XX_GPIO_IN);
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- return 0;
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-}
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-
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-static inline int gpio_direction_output(unsigned gpio, int level)
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-{
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- gpio_line_set(gpio, level);
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- gpio_line_config(gpio, IXP4XX_GPIO_OUT);
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- return 0;
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-}
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+#define NR_BUILTIN_GPIO 16
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static inline int gpio_get_value(unsigned gpio)
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{
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- int value;
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-
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- gpio_line_get(gpio, &value);
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-
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- return value;
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+ if (gpio < NR_BUILTIN_GPIO)
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+ {
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+ int value;
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+ gpio_line_get(gpio, &value);
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+ return value;
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+ }
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+ else
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+ return __gpio_get_value(gpio);
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}
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static inline void gpio_set_value(unsigned gpio, int value)
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{
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- gpio_line_set(gpio, value);
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+ if (gpio < NR_BUILTIN_GPIO)
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+ gpio_line_set(gpio, value);
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+ else
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+ __gpio_set_value(gpio, value);
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}
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-#include <asm-generic/gpio.h> /* cansleep wrappers */
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+#define gpio_cansleep __gpio_cansleep
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extern int gpio_to_irq(int gpio);
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#define gpio_to_irq gpio_to_irq
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