release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-ixp4xx/include/mach/gpio.h

   1 /*
   2  * arch/arm/mach-ixp4xx/include/mach/gpio.h
   3  *
   4  * IXP4XX GPIO wrappers for arch-neutral GPIO calls
   5  *
   6  * Written by Milan Svoboda <msvoboda@ra.rockwell.com>
   7  * Based on PXA implementation by Philipp Zabel <philipp.zabel@gmail.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  *
  23  */
  24
  25 #ifndef __ASM_ARCH_IXP4XX_GPIO_H
  26 #define __ASM_ARCH_IXP4XX_GPIO_H
  27
  28 #include <linux/kernel.h>
  29 #include <mach/hardware.h>
  30
  31 static inline int gpio_request(unsigned gpio, const char *label)
  32 {
  33         return 0;
  34 }
  35
  36 static inline void gpio_free(unsigned gpio)
  37 {
  38         might_sleep();
  39
  40         return;
  41 }
  42
  43 static inline int gpio_direction_input(unsigned gpio)
  44 {
  45         gpio_line_config(gpio, IXP4XX_GPIO_IN);
  46         return 0;
  47 }
  48
  49 static inline int gpio_direction_output(unsigned gpio, int level)
  50 {
  51         gpio_line_set(gpio, level);
  52         gpio_line_config(gpio, IXP4XX_GPIO_OUT);
  53         return 0;
  54 }
  55
  56 static inline int gpio_get_value(unsigned gpio)
  57 {
  58         int value;
  59
  60         gpio_line_get(gpio, &value);
  61
  62         return value;
  63 }
  64
  65 static inline void gpio_set_value(unsigned gpio, int value)
  66 {
  67         gpio_line_set(gpio, value);
  68 }
  69
  70 #include <asm-generic/gpio.h>                   /* cansleep wrappers */
  71
  72 extern int gpio_to_irq(int gpio);
  73 extern int irq_to_gpio(unsigned int irq);
  74
  75 #endif