gpio.c File Reference

#include <device/mmio.h>
#include <console/console.h>
#include <soc/ti/am335x/gpio.h>
#include <stdint.h>

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Functions
static struct am335x_gpio_regs *	gpio_regs_and_bit (unsigned int gpio, uint32_t *bit)
void	am335x_disable_gpio_irqs (void)
int	gpio_direction_input (unsigned int gpio)
	Make a GPIO an input. More...
int	gpio_direction_output (unsigned int gpio, int value)
	Make a GPIO an output, and set its value. More...
int	gpio_get_value (unsigned int gpio)
	Get a GPIO's value. More...
int	gpio_set_value (unsigned int gpio, int value)
	Set an output GPIO's value. More...

Function Documentation

am335x_disable_gpio_irqs()

void am335x_disable_gpio_irqs

(

void

)

Definition at line 21 of file gpio.c.

References am335x_gpio_banks, ARRAY_SIZE, am335x_gpio_regs::irqstatus_clr_0, and write32().

Referenced by bootblock_mainboard_early_init().

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gpio_direction_input()

int gpio_direction_input

(

unsigned int

gpio

)

Make a GPIO an input.

Parameters

gpio	GPIO number

Returns

0 if ok, -1 on error

Definition at line 29 of file gpio.c.

References gpio_regs_and_bit(), and setbits32.

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gpio_direction_output()

int gpio_direction_output	(	unsigned int	gpio,
		int	value
	)

Make a GPIO an output, and set its value.

Parameters

gpio	GPIO number
value	GPIO value (0 for low or 1 for high)

Returns

0 if ok, -1 on error

Definition at line 40 of file gpio.c.

References clrbits32, gpio_regs_and_bit(), value, and write32().

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gpio_get_value()

int gpio_get_value

(

unsigned int

gpio

)

Get a GPIO's value.

This will work whether the GPIO is an input or an output.

Parameters

gpio	GPIO number

Returns

0 if low, 1 if high, -1 on error

Definition at line 55 of file gpio.c.

References gpio_regs_and_bit(), and read32().

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gpio_regs_and_bit()

static struct am335x_gpio_regs* gpio_regs_and_bit ( unsigned int  gpio, uint32_t *  bit  )

static

Definition at line 8 of file gpio.c.

References am335x_gpio_banks, AM335X_GPIO_BITS_PER_BANK, ARRAY_SIZE, BIOS_ERR, NULL, and printk.

Referenced by gpio_direction_input(), gpio_direction_output(), gpio_get_value(), and gpio_set_value().

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gpio_set_value()

int gpio_set_value	(	unsigned int	gpio,
		int	value
	)

Set an output GPIO's value.

The GPIO must already be an output or this function may have no effect.

Parameters

gpio	GPIO number
value	GPIO value (0 for low or 1 for high)

Returns

0 if ok, -1 on error

Definition at line 65 of file gpio.c.

References gpio_regs_and_bit(), value, and write32().

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