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Diffstat (limited to 'arch')
-rw-r--r--arch/arm/Kconfig1
-rw-r--r--arch/arm/mach-imx/generic.c118
2 files changed, 119 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 50d9f3e4e0f..8b553954365 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -241,6 +241,7 @@ config ARCH_H720X
config ARCH_IMX
bool "IMX"
+ select GENERIC_GPIO
help
Support for Motorola's i.MX family of processors (MX1, MXL).
diff --git a/arch/arm/mach-imx/generic.c b/arch/arm/mach-imx/generic.c
index 1c474cf709c..a58b678006d 100644
--- a/arch/arm/mach-imx/generic.c
+++ b/arch/arm/mach-imx/generic.c
@@ -28,12 +28,16 @@
#include <linux/module.h>
#include <linux/string.h>
+#include <asm/errno.h>
#include <asm/arch/imxfb.h>
#include <asm/hardware.h>
#include <asm/arch/imx-regs.h>
#include <asm/mach/map.h>
#include <asm/arch/mmc.h>
+#include <asm/arch/gpio.h>
+
+unsigned long imx_gpio_alloc_map[(GPIO_PORT_MAX + 1) * 32 / BITS_PER_LONG];
void imx_gpio_mode(int gpio_mode)
{
@@ -95,6 +99,120 @@ void imx_gpio_mode(int gpio_mode)
EXPORT_SYMBOL(imx_gpio_mode);
+int imx_gpio_request(unsigned gpio, const char *label)
+{
+ if(gpio >= (GPIO_PORT_MAX + 1) * 32)
+ printk(KERN_ERR "imx_gpio: Attempt to request nonexistent GPIO %d for \"%s\"\n",
+ gpio, label ? label : "?");
+ return -EINVAL;
+
+ if(test_and_set_bit(gpio, imx_gpio_alloc_map)) {
+ printk(KERN_ERR "imx_gpio: GPIO %d already used. Allocation for \"%s\" failed\n",
+ gpio, label ? label : "?");
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+EXPORT_SYMBOL(imx_gpio_request);
+
+void imx_gpio_free(unsigned gpio)
+{
+ if(gpio >= (GPIO_PORT_MAX + 1) * 32)
+ return;
+
+ clear_bit(gpio, imx_gpio_alloc_map);
+}
+
+EXPORT_SYMBOL(imx_gpio_free);
+
+int imx_gpio_direction_input(unsigned gpio)
+{
+ imx_gpio_mode(gpio| GPIO_IN);
+ return 0;
+}
+
+EXPORT_SYMBOL(imx_gpio_direction_input);
+
+int imx_gpio_direction_output(unsigned gpio, int value)
+{
+ imx_gpio_set_value(gpio, value);
+ imx_gpio_mode(gpio| GPIO_OUT);
+ return 0;
+}
+
+EXPORT_SYMBOL(imx_gpio_direction_output);
+
+int imx_gpio_setup_multiple_pins(const int *pin_list, unsigned count,
+ int alloc_mode, const char *label)
+{
+ const int *p = pin_list;
+ int i;
+ unsigned gpio;
+ unsigned mode;
+
+ for (i = 0; i < count; i++) {
+ gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
+ mode = *p & ~(GPIO_PIN_MASK | GPIO_PORT_MASK);
+
+ if (gpio >= (GPIO_PORT_MAX + 1) * 32)
+ goto setup_error;
+
+ if (alloc_mode & IMX_GPIO_ALLOC_MODE_RELEASE)
+ imx_gpio_free(gpio);
+ else if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_NO_ALLOC))
+ if (imx_gpio_request(gpio, label))
+ if (!(alloc_mode & IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
+ goto setup_error;
+
+ if (!(alloc_mode & (IMX_GPIO_ALLOC_MODE_ALLOC_ONLY |
+ IMX_GPIO_ALLOC_MODE_RELEASE)))
+ imx_gpio_mode(gpio | mode);
+
+ p++;
+ }
+ return 0;
+
+setup_error:
+ if(alloc_mode & (IMX_GPIO_ALLOC_MODE_NO_ALLOC |
+ IMX_GPIO_ALLOC_MODE_TRY_ALLOC))
+ return -EINVAL;
+
+ while (p != pin_list) {
+ p--;
+ gpio = *p & (GPIO_PIN_MASK | GPIO_PORT_MASK);
+ imx_gpio_free(gpio);
+ }
+
+ return -EINVAL;
+}
+
+EXPORT_SYMBOL(imx_gpio_setup_multiple_pins);
+
+void __imx_gpio_set_value(unsigned gpio, int value)
+{
+ imx_gpio_set_value_inline(gpio, value);
+}
+
+EXPORT_SYMBOL(__imx_gpio_set_value);
+
+int imx_gpio_to_irq(unsigned gpio)
+{
+ return IRQ_GPIOA(0) + gpio;
+}
+
+EXPORT_SYMBOL(imx_gpio_to_irq);
+
+int imx_irq_to_gpio(unsigned irq)
+{
+ if (irq < IRQ_GPIOA(0))
+ return -EINVAL;
+ return irq - IRQ_GPIOA(0);
+}
+
+EXPORT_SYMBOL(imx_irq_to_gpio);
+
/*
* get the system pll clock in Hz
*