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

   1 /*
   2  * linux/include/asm-arm/arch-pxa/gpio.h
   3  *
   4  * PXA GPIO wrappers for arch-neutral GPIO calls
   5  *
   6  * Written by Philipp Zabel <philipp.zabel@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  */
  23
  24 #ifndef __ASM_ARCH_PXA_GPIO_H
  25 #define __ASM_ARCH_PXA_GPIO_H
  26
  27 #include <asm/arch/pxa-regs.h>
  28 #include <asm/irq.h>
  29 #include <asm/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         return;
  39 }
  40
  41 static inline int gpio_direction_input(unsigned gpio)
  42 {
  43         return pxa_gpio_mode(gpio | GPIO_IN);
  44 }
  45
  46 static inline int gpio_direction_output(unsigned gpio, int value)
  47 {
  48         return pxa_gpio_mode(gpio | GPIO_OUT |
  49                          (value ? GPIO_DFLT_HIGH : GPIO_DFLT_LOW));
  50 }
  51
  52 static inline int __gpio_get_value(unsigned gpio)
  53 {
  54         return GPLR(gpio) & GPIO_bit(gpio);
  55 }
  56
  57 #define gpio_get_value(gpio)                    \
  58         (__builtin_constant_p(gpio) ?           \
  59          __gpio_get_value(gpio) :               \
  60          pxa_gpio_get_value(gpio))
  61
  62 static inline void __gpio_set_value(unsigned gpio, int value)
  63 {
  64         if (value)
  65                 GPSR(gpio) = GPIO_bit(gpio);
  66         else
  67                 GPCR(gpio) = GPIO_bit(gpio);
  68 }
  69
  70 #define gpio_set_value(gpio,value)              \
  71         (__builtin_constant_p(gpio) ?           \
  72          __gpio_set_value(gpio, value) :        \
  73          pxa_gpio_set_value(gpio, value))
  74
  75 #include <asm-generic/gpio.h>                   /* cansleep wrappers */
  76
  77 #define gpio_to_irq(gpio)       IRQ_GPIO(gpio)
  78 #define irq_to_gpio(irq)        IRQ_TO_GPIO(irq)
  79
  80
  81 #endif