arch/openrisc/include/asm/gpio.h

   1 /*
   2  * OpenRISC Linux
   3  *
   4  * Linux architectural port borrowing liberally from similar works of
   5  * others.  All original copyrights apply as per the original source
   6  * declaration.
   7  *
   8  * OpenRISC implementation:
   9  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  10  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  11  * et al.
  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 as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  */
  18
  19 #ifndef __ASM_OPENRISC_GPIO_H
  20 #define __ASM_OPENRISC_GPIO_H
  21
  22 #include <linux/errno.h>
  23 #include <asm-generic/gpio.h>
  24
  25 #ifdef CONFIG_GPIOLIB
  26
  27 /*
  28  * OpenRISC (or1k) does not have on-chip GPIO's so there is not really
  29  * any standardized implementation that makes sense here.  If passing
  30  * through gpiolib becomes a bottleneck then it may make sense, on a
  31  * case-by-case basis, to implement these inlined/rapid versions.
  32  *
  33  * Just call gpiolib.
  34  */
  35 static inline int gpio_get_value(unsigned int gpio)
  36 {
  37         return __gpio_get_value(gpio);
  38 }
  39
  40 static inline void gpio_set_value(unsigned int gpio, int value)
  41 {
  42         __gpio_set_value(gpio, value);
  43 }
  44
  45 static inline int gpio_cansleep(unsigned int gpio)
  46 {
  47         return __gpio_cansleep(gpio);
  48 }
  49
  50 /*
  51  * Not implemented, yet.
  52  */
  53 static inline int gpio_to_irq(unsigned int gpio)
  54 {
  55         return -ENOSYS;
  56 }
  57
  58 static inline int irq_to_gpio(unsigned int irq)
  59 {
  60         return -EINVAL;
  61 }
  62
  63 #endif /* CONFIG_GPIOLIB */
  64
  65 #endif /* __ASM_OPENRISC_GPIO_H */