kernel/2.6.29.6-aldebaran-rt/arch/arm/plat-s3c/include/plat/gpio-core.h

   1 /* linux/arch/arm/plat-s3c/include/plat/gpio-core.h
   2  *
   3  * Copyright 2008 Simtec Electronics
   4  *      http://armlinux.simtec.co.uk/
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *
   7  * S3C Platform - GPIO core
   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 version 2 as
  11  * published by the Free Software Foundation.
  12 */
  13
  14 /* Define the core gpiolib support functions that the s3c platforms may
  15  * need to extend or change depending on the hardware and the s3c chip
  16  * selected at build or found at run time.
  17  *
  18  * These definitions are not intended for driver inclusion, there is
  19  * nothing here that should not live outside the platform and core
  20  * specific code.
  21 */
  22
  23 struct s3c_gpio_cfg;
  24
  25 /**
  26  * struct s3c_gpio_chip - wrapper for specific implementation of gpio
  27  * @chip: The chip structure to be exported via gpiolib.
  28  * @base: The base pointer to the gpio configuration registers.
  29  * @config: special function and pull-resistor control information.
  30  *
  31  * This wrapper provides the necessary information for the Samsung
  32  * specific gpios being registered with gpiolib.
  33  */
  34 struct s3c_gpio_chip {
  35         struct gpio_chip        chip;
  36         struct s3c_gpio_cfg     *config;
  37         void __iomem            *base;
  38 };
  39
  40 static inline struct s3c_gpio_chip *to_s3c_gpio(struct gpio_chip *gpc)
  41 {
  42         return container_of(gpc, struct s3c_gpio_chip, chip);
  43 }
  44
  45 /** s3c_gpiolib_add() - add the s3c specific version of a gpio_chip.
  46  * @chip: The chip to register
  47  *
  48  * This is a wrapper to gpiochip_add() that takes our specific gpio chip
  49  * information and makes the necessary alterations for the platform and
  50  * notes the information for use with the configuration systems and any
  51  * other parts of the system.
  52  */
  53 extern void s3c_gpiolib_add(struct s3c_gpio_chip *chip);
  54
  55 /* CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios
  56  * for use with the configuration calls, and other parts of the s3c gpiolib
  57  * support code.
  58  *
  59  * Not all s3c support code will need this, as some configurations of cpu
  60  * may only support one or two different configuration options and have an
  61  * easy gpio to s3c_gpio_chip mapping function. If this is the case, then
  62  * the machine support file should provide its own s3c_gpiolib_getchip()
  63  * and any other necessary functions.
  64  */
  65
  66 #ifdef CONFIG_S3C_GPIO_TRACK
  67 extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END];
  68
  69 static inline struct s3c_gpio_chip *s3c_gpiolib_getchip(unsigned int chip)
  70 {
  71         return (chip < S3C_GPIO_END) ? s3c_gpios[chip] : NULL;
  72 }
  73 #else
  74 /* machine specific code should provide s3c_gpiolib_getchip */
  75
  76 static inline void s3c_gpiolib_track(struct s3c_gpio_chip *chip) { }
  77 #endif