release/src-rt-6.x/linux/linux-2.6/arch/arm/plat-iop/gpio.c

   1 /*
   2  * arch/arm/plat-iop/gpio.c
   3  * GPIO handling for Intel IOP3xx processors.
   4  *
   5  * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or (at
  10  * your option) any later version.
  11  */
  12
  13 #include <linux/device.h>
  14 #include <asm/hardware/iop3xx.h>
  15
  16 void gpio_line_config(int line, int direction)
  17 {
  18         unsigned long flags;
  19
  20         local_irq_save(flags);
  21         if (direction == GPIO_IN) {
  22                 *IOP3XX_GPOE |= 1 << line;
  23         } else if (direction == GPIO_OUT) {
  24                 *IOP3XX_GPOE &= ~(1 << line);
  25         }
  26         local_irq_restore(flags);
  27 }
  28 EXPORT_SYMBOL(gpio_line_config);
  29
  30 int gpio_line_get(int line)
  31 {
  32         return !!(*IOP3XX_GPID & (1 << line));
  33 }
  34 EXPORT_SYMBOL(gpio_line_get);
  35
  36 void gpio_line_set(int line, int value)
  37 {
  38         unsigned long flags;
  39
  40         local_irq_save(flags);
  41         if (value == GPIO_LOW) {
  42                 *IOP3XX_GPOD &= ~(1 << line);
  43         } else if (value == GPIO_HIGH) {
  44                 *IOP3XX_GPOD |= 1 << line;
  45         }
  46         local_irq_restore(flags);
  47 }
  48 EXPORT_SYMBOL(gpio_line_set);