release/src-rt-6.x/linux/linux-2.6/include/asm-arm/arch-ixp2000/gpio.h

   1 /*
   2  * include/asm-arm/arch-ixp2000/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
  30 extern void gpio_line_config(int line, int direction);
  31
  32 static inline int gpio_line_get(int line)
  33 {
  34         return (((*IXP2000_GPIO_PLR) >> line) & 1);
  35 }
  36
  37 static 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_ */