mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-02 17:41:08 +00:00
84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*
|
|
* OpenRISC gpio driver
|
|
*
|
|
* Copyright (C) 2011 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
|
|
*
|
|
* based on nios2 gpio driver
|
|
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
|
|
*
|
|
* when CONFIG_SYS_GPIO_BASE is not defined, board may provide
|
|
* its own driver.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#ifdef CONFIG_SYS_GPIO_BASE
|
|
#include <asm/io.h>
|
|
|
|
static inline int gpio_request(unsigned gpio, const char *label)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int gpio_free(unsigned gpio)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int gpio_get_value(unsigned gpio)
|
|
{
|
|
return (readb(CONFIG_SYS_GPIO_BASE + gpio/8) >> gpio%8) & 0x1;
|
|
}
|
|
|
|
static inline void gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
u8 tmp = readb(CONFIG_SYS_GPIO_BASE + gpio/8);
|
|
|
|
if (value)
|
|
tmp |= (1 << gpio%8);
|
|
else
|
|
tmp &= ~(1 << gpio%8);
|
|
writeb(tmp, CONFIG_SYS_GPIO_BASE + gpio/8);
|
|
}
|
|
|
|
static inline int gpio_direction_input(unsigned gpio)
|
|
{
|
|
gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int gpio_direction_output(unsigned gpio, int value)
|
|
{
|
|
gpio_set_value(gpio + CONFIG_SYS_GPIO_WIDTH, 1);
|
|
gpio_set_value(gpio, value);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int gpio_is_valid(int number)
|
|
{
|
|
return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH;
|
|
}
|
|
#else
|
|
extern int gpio_request(unsigned gpio, const char *label);
|
|
extern int gpio_free(unsigned gpio);
|
|
extern int gpio_direction_input(unsigned gpio);
|
|
extern int gpio_direction_output(unsigned gpio, int value);
|
|
extern int gpio_get_value(unsigned gpio);
|
|
extern void gpio_set_value(unsigned gpio, int value);
|
|
extern int gpio_is_valid(int number);
|
|
#endif /* CONFIG_SYS_GPIO_BASE */
|