mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-29 05:18:51 +09:00
![Gabriel Huau](/assets/img/avatar_default.png)
It's now possible to use the gpio driver interface for s3c2440. This patch add iomux definitions too. Signed-off-by: Gabriel Huau <contact@huau-gabriel.fr>
96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2012
|
|
* Gabriel Huau <contact@huau-gabriel.fr>
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
#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(port, l);
|
|
}
|
|
|
|
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_FULLPORT(gpio), GPIO_INPUT << GPIO_BIT(gpio));
|
|
}
|
|
|
|
int gpio_direction_output(unsigned gpio, int value)
|
|
{
|
|
writel(GPIO_FULLPORT(gpio), GPIO_OUTPUT << GPIO_BIT(gpio));
|
|
return gpio_set_value(gpio, value);
|
|
}
|