s3c2440_gpio.c
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/*
* Copyright (C) 2012
* Gabriel Huau <contact@huau-gabriel.fr>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/s3c2440.h>
#include <asm/gpio.h>
#include <asm/io.h>
#define GPIO_INPUT 0x0
#define GPIO_OUTPUT 0x1
/* 0x4 means that we want DAT and not CON register */
#define GPIO_PORT(x) ((((x) >> 5) & 0x3) + 0x4)
#define GPIO_BIT(x) ((x) & 0x3f)
/*
* It's how we calculate the full port address
* We have to get the number of the port + 1 (Port A is at 0x56000001 ...)
* We move it at the second digit, and finally we add 0x4 because we want
* to modify GPIO DAT and not CON
*/
#define GPIO_FULLPORT(x) (S3C24X0_GPIO_BASE | ((GPIO_PORT(gpio) + 1) << 1))
int gpio_set_value(unsigned gpio, int value)
{
unsigned l = readl(GPIO_FULLPORT(gpio));
unsigned bit;
unsigned port = GPIO_FULLPORT(gpio);
/*
* All GPIO Port have a configuration on
* 2 bits excepted the first GPIO (A) which
* have only 1 bit of configuration.
*/
if (!GPIO_PORT(gpio))
bit = (0x1 << GPIO_BIT(gpio));
else
bit = (0x3 << GPIO_BIT(gpio));
if (value)
l |= bit;
else
l &= ~bit;
return writel(l, port);
}
int gpio_get_value(unsigned gpio)
{
unsigned l = readl(GPIO_FULLPORT(gpio));
if (GPIO_PORT(gpio) == 0) /* PORT A */
return (l >> GPIO_BIT(gpio)) & 0x1;
return (l >> GPIO_BIT(gpio)) & 0x3;
}
int gpio_request(unsigned gpio, const char *label)
{
return 0;
}
int gpio_free(unsigned gpio)
{
return 0;
}
int gpio_direction_input(unsigned gpio)
{
return writel(GPIO_INPUT << GPIO_BIT(gpio), GPIO_FULLPORT(gpio));
}
int gpio_direction_output(unsigned gpio, int value)
{
writel(GPIO_OUTPUT << GPIO_BIT(gpio), GPIO_FULLPORT(gpio));
return gpio_set_value(gpio, value);
}