diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm/mach-imx/generic.c | 118 |
2 files changed, 119 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 50d9f3e4e0f1..8b553954365f 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 1c474cf709ca..a58b678006df 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 * |