include/asm-arm/arch-ixp2000/gpio.h

   1 /*
   2  * include/asm-arm/arch-ixp2000/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_IXP2000_GPIO_H_
  20 #define _ASM_ARCH_IXP2000_GPIO_H_
  21
  22 #ifndef __ASSEMBLY__
  23 #define GPIO_OUT                        0x0
  24 #define GPIO_IN                         0x80
  25
  26 #define IXP2000_GPIO_LOW                0
  27 #define IXP2000_GPIO_HIGH               1
  28
  29 #define GPIO_NO_EDGES                   0
  30 #define GPIO_FALLING_EDGE               1
  31 #define GPIO_RISING_EDGE                2
  32 #define GPIO_BOTH_EDGES                 3
  33 #define GPIO_LEVEL_LOW                  4
  34 #define GPIO_LEVEL_HIGH                 8
  35
  36 extern void set_GPIO_IRQ_edge(int gpio_nr, int edge);
  37 extern void set_GPIO_IRQ_level(int gpio_nr, int level);
  38 extern void gpio_line_config(int line, int style);
  39
  40 static inline int gpio_line_get(int line)
  41 {
  42         return (((*IXP2000_GPIO_PLR) >> line) & 1);
  43 }
  44
  45 static inline void gpio_line_set(int line, int value)
  46 {
  47         if (value == IXP2000_GPIO_HIGH) {
  48                 ixp_reg_write(IXP2000_GPIO_POSR, BIT(line));
  49         } else if (value == IXP2000_GPIO_LOW)
  50                 ixp_reg_write(IXP2000_GPIO_POCR, BIT(line));
  51 }
  52
  53 #endif /* !__ASSEMBLY__ */
  54 #endif /* ASM_ARCH_IXP2000_GPIO_H_ */
  55