mirror of
https://github.com/Fishwaldo/u-boot.git
synced 2025-03-18 13:11:31 +00:00
GPIO: Add SPEAr GPIO driver
Tested on x600 (SPEAr600). Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
parent
ef76025a99
commit
2cb06a4fda
3 changed files with 143 additions and 0 deletions
40
arch/arm/include/asm/arch-spear/gpio.h
Normal file
40
arch/arm/include/asm/arch-spear/gpio.h
Normal file
|
@ -0,0 +1,40 @@
|
|||
/*
|
||||
* Copyright (C) 2012 Stefan Roese <sr@denx.de>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
|
||||
#ifndef __ASM_ARCH_SPEAR_GPIO_H
|
||||
#define __ASM_ARCH_SPEAR_GPIO_H
|
||||
|
||||
enum gpio_direction {
|
||||
GPIO_DIRECTION_IN,
|
||||
GPIO_DIRECTION_OUT,
|
||||
};
|
||||
|
||||
struct gpio_regs {
|
||||
u32 gpiodata[0x100]; /* 0x000 ... 0x3fc */
|
||||
u32 gpiodir; /* 0x400 */
|
||||
};
|
||||
|
||||
#define SPEAR_GPIO_COUNT 8
|
||||
#define DATA_REG_ADDR(gpio) (1 << (gpio + 2))
|
||||
|
||||
#endif /* __ASM_ARCH_SPEAR_GPIO_H */
|
|
@ -35,6 +35,7 @@ COBJS-$(CONFIG_PCA953X) += pca953x.o
|
|||
COBJS-$(CONFIG_PCA9698) += pca9698.o
|
||||
COBJS-$(CONFIG_S5P) += s5p_gpio.o
|
||||
COBJS-$(CONFIG_SANDBOX_GPIO) += sandbox.o
|
||||
COBJS-$(CONFIG_SPEAR_GPIO) += spear_gpio.o
|
||||
COBJS-$(CONFIG_TEGRA_GPIO) += tegra_gpio.o
|
||||
COBJS-$(CONFIG_DA8XX_GPIO) += da8xx_gpio.o
|
||||
COBJS-$(CONFIG_ALTERA_PIO) += altera_pio.o
|
||||
|
|
102
drivers/gpio/spear_gpio.c
Normal file
102
drivers/gpio/spear_gpio.c
Normal file
|
@ -0,0 +1,102 @@
|
|||
/*
|
||||
* Copyright (C) 2012 Stefan Roese <sr@denx.de>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
/*
|
||||
* Driver for SPEAr600 GPIO controller
|
||||
*/
|
||||
|
||||
#include <common.h>
|
||||
#include <asm/arch/hardware.h>
|
||||
#include <asm/gpio.h>
|
||||
#include <asm/io.h>
|
||||
#include <errno.h>
|
||||
|
||||
static int gpio_direction(unsigned gpio,
|
||||
enum gpio_direction direction)
|
||||
{
|
||||
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
||||
u32 val;
|
||||
|
||||
val = readl(®s->gpiodir);
|
||||
|
||||
if (direction == GPIO_DIRECTION_OUT)
|
||||
val |= 1 << gpio;
|
||||
else
|
||||
val &= ~(1 << gpio);
|
||||
|
||||
writel(val, ®s->gpiodir);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int gpio_set_value(unsigned gpio, int value)
|
||||
{
|
||||
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
||||
|
||||
writel(1 << gpio, ®s->gpiodata[DATA_REG_ADDR(gpio)]);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int gpio_get_value(unsigned gpio)
|
||||
{
|
||||
struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
|
||||
u32 val;
|
||||
|
||||
val = readl(®s->gpiodata[DATA_REG_ADDR(gpio)]);
|
||||
|
||||
return !!val;
|
||||
}
|
||||
|
||||
int gpio_request(unsigned gpio, const char *label)
|
||||
{
|
||||
if (gpio >= SPEAR_GPIO_COUNT)
|
||||
return -EINVAL;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int gpio_free(unsigned gpio)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
void gpio_toggle_value(unsigned gpio)
|
||||
{
|
||||
gpio_set_value(gpio, !gpio_get_value(gpio));
|
||||
}
|
||||
|
||||
int gpio_direction_input(unsigned gpio)
|
||||
{
|
||||
return gpio_direction(gpio, GPIO_DIRECTION_IN);
|
||||
}
|
||||
|
||||
int gpio_direction_output(unsigned gpio, int value)
|
||||
{
|
||||
int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
|
||||
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
gpio_set_value(gpio, value);
|
||||
return 0;
|
||||
}
|
Loading…
Add table
Reference in a new issue