gpio.c File Reference

#include <assert.h>
#include <console/console.h>
#include <device/mmio.h>
#include <delay.h>
#include <soc/cpu.h>
#include <soc/gpio.h>

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Go to the source code of this file.

Data Structures
struct	gpio_info

Macros
#define	CON_MASK(x)   (0xf << ((x) << 2))
#define	CON_SFR(x, v)   ((v) << ((x) << 2))
#define	DAT_MASK(x)   (0x1 << (x))
#define	DAT_SET(x)   (0x1 << (x))
#define	PULL_MASK(x)   (0x3 << ((x) << 1))
#define	PULL_MODE(x, v)   ((v) << ((x) << 1))
#define	DRV_MASK(x)   (0x3 << ((x) << 1))
#define	DRV_SET(x, m)   ((m) << ((x) << 1))
#define	RATE_MASK(x)   (0x1 << (x + 16))
#define	RATE_SET(x)   (0x1 << (x + 16))
#define	GPIO_BIT(x)   ((x) & 0x7)
#define	GPIO_DELAY_US   15

Functions
static struct gpio_bank *	gpio_get_bank (unsigned int gpio)
void	gpio_cfg_pin (int gpio, int cfg)
	Set GPIO pin configuration. More...
static int	gpio_get_cfg (int gpio)
void	gpio_set_pull (int gpio, int mode)
	Set GPIO pull mode. More...
void	gpio_set_drv (int gpio, int mode)
	Set GPIO drive strength level. More...
void	gpio_set_rate (int gpio, int mode)
	Set GPIO drive rate. More...
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...
int	gpio_read_mvl3 (unsigned int gpio)
void	gpio_info (void)

Variables
static const struct gpio_info	gpio_data [EXYNOS_GPIO_NUM_PARTS]

Macro Definition Documentation

CON_MASK

#define CON_MASK

(

x

)

(0xf << ((x) << 2))

Definition at line 10 of file gpio.c.

CON_SFR

#define CON_SFR	(		x,
			v
	)		((v) << ((x) << 2))

Definition at line 11 of file gpio.c.

DAT_MASK

#define DAT_MASK

(

x

)

(0x1 << (x))

Definition at line 13 of file gpio.c.

DAT_SET

#define DAT_SET

(

x

)

(0x1 << (x))

Definition at line 14 of file gpio.c.

DRV_MASK

#define DRV_MASK

(

x

)

(0x3 << ((x) << 1))

Definition at line 19 of file gpio.c.

DRV_SET

#define DRV_SET	(		x,
			m
	)		((m) << ((x) << 1))

Definition at line 20 of file gpio.c.

GPIO_BIT

#define GPIO_BIT

(

x

)

((x) & 0x7)

Definition at line 39 of file gpio.c.

GPIO_DELAY_US

#define GPIO_DELAY_US   15

Definition at line 195 of file gpio.c.

PULL_MASK

#define PULL_MASK

(

x

)

(0x3 << ((x) << 1))

Definition at line 16 of file gpio.c.

PULL_MODE

#define PULL_MODE	(		x,
			v
	)		((v) << ((x) << 1))

Definition at line 17 of file gpio.c.

RATE_MASK

#define RATE_MASK

(

x

)

(0x1 << (x + 16))

Definition at line 21 of file gpio.c.

RATE_SET

#define RATE_SET

(

x

)

(0x1 << (x + 16))

Definition at line 22 of file gpio.c.

Function Documentation

gpio_cfg_pin()

void gpio_cfg_pin	(	int	gpio,
		int	cfg
	)

Set GPIO pin configuration.

Parameters

gpio	GPIO pin
cfg	Either GPIO_INPUT, GPIO_OUTPUT, or GPIO_IRQ

Definition at line 63 of file gpio.c.

References gpio_bank::con, CON_MASK, CON_SFR, GPIO_BIT, gpio_get_bank(), read32(), value, and write32().

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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 144 of file gpio.c.

References gpio_cfg_pin(), and GPIO_INPUT.

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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 151 of file gpio.c.

References gpio_bank::dat, DAT_MASK, DAT_SET, GPIO_BIT, gpio_cfg_pin(), gpio_get_bank(), GPIO_OUTPUT, read32(), val, value, and write32().

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gpio_get_bank()

static struct gpio_bank* gpio_get_bank ( unsigned int  gpio )

static

Definition at line 41 of file gpio.c.

References ASSERT, EXYNOS_GPIO_NUM_PARTS, gpio_data, GPIO_MAX_PORT, GPIO_PER_BANK, gpio_info::max_gpio, NULL, and gpio_info::reg_addr.

Referenced by gpio_cfg_pin(), gpio_direction_output(), gpio_get_cfg(), gpio_get_value(), gpio_set_drv(), gpio_set_pull(), gpio_set_rate(), and gpio_set_value().

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gpio_get_cfg()

static int gpio_get_cfg ( int  gpio )

static

Definition at line 74 of file gpio.c.

References gpio_bank::con, CON_MASK, GPIO_BIT, gpio_get_bank(), and read32().

Referenced by gpio_info().

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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 167 of file gpio.c.

References gpio_bank::dat, DAT_MASK, GPIO_BIT, gpio_get_bank(), read32(), and value.

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gpio_info()

void gpio_info

(

void

)

Definition at line 236 of file gpio.c.

References BIOS_INFO, gpio_get_cfg(), gpio_get_value(), GPIO_INPUT, GPIO_MAX_PORT, GPIO_OUTPUT, and printk.

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gpio_read_mvl3()

int gpio_read_mvl3

(

unsigned int

gpio

)

Definition at line 197 of file gpio.c.

References GPIO_DELAY_US, gpio_direction_input(), gpio_get_value(), GPIO_MAX_PORT, GPIO_PULL_DOWN, GPIO_PULL_UP, gpio_set_pull(), LOGIC_0, LOGIC_1, LOGIC_Z, udelay(), and value.

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gpio_set_drv()

void gpio_set_drv	(	int	gpio,
		int	mode
	)

Set GPIO drive strength level.

Parameters

gpio	GPIO pin
mode	Either GPIO_DRV_1X, GPIO_DRV_2X, GPIO_DRV_3X, or GPIO_DRV_4X

Definition at line 102 of file gpio.c.

References gpio_bank::drv, DRV_MASK, DRV_SET, GPIO_BIT, GPIO_DRV_1X, GPIO_DRV_2X, GPIO_DRV_3X, GPIO_DRV_4X, gpio_get_bank(), read32(), value, and write32().

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gpio_set_pull()

void gpio_set_pull	(	int	gpio,
		int	mode
	)

Set GPIO pull mode.

Parameters

gpio	GPIO pin
mode	Either GPIO_PULL_DOWN or GPIO_PULL_UP

Definition at line 82 of file gpio.c.

References GPIO_BIT, gpio_get_bank(), GPIO_PULL_DOWN, GPIO_PULL_UP, gpio_bank::pull, PULL_MASK, PULL_MODE, read32(), value, and write32().

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gpio_set_rate()

void gpio_set_rate	(	int	gpio,
		int	mode
	)

Set GPIO drive rate.

Parameters

gpio	GPIO pin
mode	Either GPIO_DRV_FAST or GPIO_DRV_SLOW

Definition at line 124 of file gpio.c.

References gpio_bank::drv, GPIO_BIT, GPIO_DRV_FAST, GPIO_DRV_SLOW, gpio_get_bank(), RATE_MASK, RATE_SET, read32(), value, and write32().

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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 176 of file gpio.c.

References gpio_bank::dat, DAT_MASK, DAT_SET, GPIO_BIT, gpio_get_bank(), read32(), val, value, and write32().

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Variable Documentation

gpio_data

const struct gpio_info gpio_data[EXYNOS_GPIO_NUM_PARTS]

static

Initial value:

= {
        { EXYNOS5420_GPIO_PART1_BASE, GPIO_MAX_PORT_PART_1 },
        { EXYNOS5420_GPIO_PART2_BASE, GPIO_MAX_PORT_PART_2 },
        { EXYNOS5420_GPIO_PART3_BASE, GPIO_MAX_PORT_PART_3 },
        { EXYNOS5420_GPIO_PART4_BASE, GPIO_MAX_PORT_PART_4 },
        { EXYNOS5420_GPIO_PART5_BASE, GPIO_MAX_PORT_PART_5 },
        { EXYNOS5420_GPIO_PART6_BASE, GPIO_MAX_PORT },
}

Definition at line 1 of file gpio.c.

Referenced by gpio_get_bank().