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/*
* 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.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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 */
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