arch/arm/mach-shmobile/sh-gpio.h

   1 /*
   2  * Generic GPIO API and pinmux table support
   3  *
   4  * Copyright (c) 2008  Magnus Damm
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #ifndef __ASM_ARCH_GPIO_H
  11 #define __ASM_ARCH_GPIO_H
  12
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/io.h>
  16
  17 /*
  18  * FIXME !!
  19  *
  20  * current gpio frame work doesn't have
  21  * the method to control only pull up/down/free.
  22  * this function should be replaced by correct gpio function
  23  */
  24 static inline void __init gpio_direction_none(void __iomem * addr)
  25 {
  26         __raw_writeb(0x00, addr);
  27 }
  28
  29 static inline void __init gpio_request_pullup(void __iomem * addr)
  30 {
  31         u8 data = __raw_readb(addr);
  32
  33         data &= 0x0F;
  34         data |= 0xC0;
  35         __raw_writeb(data, addr);
  36 }
  37
  38 static inline void __init gpio_request_pulldown(void __iomem * addr)
  39 {
  40         u8 data = __raw_readb(addr);
  41
  42         data &= 0x0F;
  43         data |= 0xA0;
  44
  45         __raw_writeb(data, addr);
  46 }
  47
  48 #endif /* __ASM_ARCH_GPIO_H */