LXR linux/arch/arm/mach-ixp2000/include/mach/gpio.h

   1/*
   2 * arch/arm/mach-ixp2000/include/mach/gpio.h
   3 *
   4 * Copyright (C) 2002 Intel Corporation.
   5 *
   6 * This program is free software, you can redistribute it and/or modify 
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11/*
  12 * IXP2000 GPIO in/out, edge/level detection for IRQs:
  13 * IRQs are generated on Falling-edge, Rising-Edge, Level-low, Level-High
  14 * or both Falling-edge and Rising-edge.  
  15 * This must be called *before* the corresponding IRQ is registerd.
  16 * Use this instead of directly setting the GPIO registers.
  17 * GPIOs may also be used as GPIOs (e.g. for emulating i2c/smb)
  18 */
  19#ifndef __ASM_ARCH_GPIO_H
  20#define __ASM_ARCH_GPIO_H
  21
  22#ifndef __ASSEMBLY__
  23
  24#define GPIO_IN                         0
  25#define GPIO_OUT                        1
  26
  27#define IXP2000_GPIO_LOW                0
  28#define IXP2000_GPIO_HIGH               1
  29
  30extern void gpio_line_config(int line, int direction);
  31
  32static inline int gpio_line_get(int line)
  33{
  34        return (((*IXP2000_GPIO_PLR) >> line) & 1);
  35}
  36
  37static inline void gpio_line_set(int line, int value)
  38{
  39        if (value == IXP2000_GPIO_HIGH) {
  40                ixp2000_reg_write(IXP2000_GPIO_POSR, 1 << line);
  41        } else if (value == IXP2000_GPIO_LOW) {
  42                ixp2000_reg_write(IXP2000_GPIO_POCR, 1 << line);
  43        }
  44}
  45
  46#endif /* !__ASSEMBLY__ */
  47
  48#endif /* ASM_ARCH_IXP2000_GPIO_H_ */
  49