mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 17:58:23 +00:00
03d67e1276
This driver may handle multiple PIO cores and thus needs to be setup by calling the altera_pio_init() function within the early board setup routine. The driver comes with some extras, see below the copyleft header. Signed-off-by: Joachim Foerster <joachim.foerster@missinglinkelectronics.com> Tested-by: Thomas Chou <thomas@wytron.com.tw> Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
/*
|
|
* nios2 gpio driver
|
|
*
|
|
* This gpio core is described in http://nioswiki.com/GPIO
|
|
* bit[0] data
|
|
* bit[1] output enable
|
|
*
|
|
* When CONFIG_SYS_GPIO_BASE is not defined, the board may either
|
|
* provide its own driver or the altera_pio driver may be used.
|
|
*
|
|
* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#ifndef _ASM_NIOS2_GPIO_H_
|
|
#define _ASM_NIOS2_GPIO_H_
|
|
|
|
#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_direction_input(unsigned gpio)
|
|
{
|
|
writel(1, CONFIG_SYS_GPIO_BASE + (gpio << 2));
|
|
return 0;
|
|
}
|
|
|
|
static inline int gpio_direction_output(unsigned gpio, int value)
|
|
{
|
|
writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
|
|
return 0;
|
|
}
|
|
|
|
static inline int gpio_get_value(unsigned gpio)
|
|
{
|
|
return readl(CONFIG_SYS_GPIO_BASE + (gpio << 2));
|
|
}
|
|
|
|
static inline void gpio_set_value(unsigned gpio, int value)
|
|
{
|
|
writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
|
|
}
|
|
|
|
static inline int gpio_is_valid(int number)
|
|
{
|
|
return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH;
|
|
}
|
|
#else
|
|
#ifdef CONFIG_ALTERA_PIO
|
|
extern int altera_pio_init(u32 base, u8 width, char iot,
|
|
u32 rstval, u32 negmask,
|
|
const char *label);
|
|
|
|
extern void altera_pio_info(void);
|
|
#define gpio_status() altera_pio_info()
|
|
#endif
|
|
|
|
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 */
|
|
|
|
#endif /* _ASM_NIOS2_GPIO_H_ */
|