LXR uboot/arch/nios2/include/asm/gpio.h

   1/*
   2 * nios2 gpio driver
   3 *
   4 * This gpio core is described in http://nioswiki.com/GPIO
   5 * bit[0] data
   6 * bit[1] output enable
   7 *
   8 * When CONFIG_SYS_GPIO_BASE is not defined, the board may either
   9 * provide its own driver or the altera_pio driver may be used.
  10 *
  11 * Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
  12 *
  13 * This program is free software; you can redistribute it and/or modify
  14 * it under the terms of the GNU General Public License version 2 as
  15 * published by the Free Software Foundation.
  16 */
  17
  18#ifndef _ASM_NIOS2_GPIO_H_
  19#define _ASM_NIOS2_GPIO_H_
  20
  21#ifdef CONFIG_SYS_GPIO_BASE
  22#include <asm/io.h>
  23
  24static inline int gpio_request(unsigned gpio, const char *label)
  25{
  26        return 0;
  27}
  28
  29static inline int gpio_free(unsigned gpio)
  30{
  31        return 0;
  32}
  33
  34static inline int gpio_direction_input(unsigned gpio)
  35{
  36        writel(1, CONFIG_SYS_GPIO_BASE + (gpio << 2));
  37        return 0;
  38}
  39
  40static inline int gpio_direction_output(unsigned gpio, int value)
  41{
  42        writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
  43        return 0;
  44}
  45
  46static inline int gpio_get_value(unsigned gpio)
  47{
  48        return readl(CONFIG_SYS_GPIO_BASE + (gpio << 2));
  49}
  50
  51static inline void gpio_set_value(unsigned gpio, int value)
  52{
  53        writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
  54}
  55
  56static inline int gpio_is_valid(int number)
  57{
  58        return ((unsigned)number) < CONFIG_SYS_GPIO_WIDTH;
  59}
  60#else
  61#ifdef CONFIG_ALTERA_PIO
  62extern int altera_pio_init(u32 base, u8 width, char iot,
  63                           u32 rstval, u32 negmask,
  64                           const char *label);
  65
  66extern void altera_pio_info(void);
  67#define gpio_status() altera_pio_info()
  68#endif
  69
  70extern int gpio_request(unsigned gpio, const char *label);
  71extern int gpio_free(unsigned gpio);
  72extern int gpio_direction_input(unsigned gpio);
  73extern int gpio_direction_output(unsigned gpio, int value);
  74extern int gpio_get_value(unsigned gpio);
  75extern void gpio_set_value(unsigned gpio, int value);
  76extern int gpio_is_valid(int number);
  77#endif /* CONFIG_SYS_GPIO_BASE */
  78
  79#endif /* _ASM_NIOS2_GPIO_H_ */
  80