arch/arm/plat-samsung/include/plat/gpio-cfg.h - kernel/bruno - Git at Google

 /* linux/arch/arm/plat-s3c/include/plat/gpio-cfg.h
  *
  * Copyright 2008 Openmoko, Inc.
  * Copyright 2008 Simtec Electronics
  *	http://armlinux.simtec.co.uk/
  *	Ben Dooks <ben@simtec.co.uk>
  *
  * S3C Platform - GPIO pin configuration
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
 */

 /* This file contains the necessary definitions to get the basic gpio
  * pin configuration done such as setting a pin to input or output or
  * changing the pull-{up,down} configurations.
  */

 /* Note, this interface is being added to the s3c64xx arch first and will
  * be added to the s3c24xx systems later.
  */

 #ifndef __PLAT_GPIO_CFG_H
 #define __PLAT_GPIO_CFG_H __FILE__

 #include <linux/types.h>

 typedef unsigned int __bitwise__ samsung_gpio_pull_t;

 /* forward declaration if gpio-core.h hasn't been included */
 struct samsung_gpio_chip;

 /**
  * struct samsung_gpio_cfg GPIO configuration
  * @cfg_eint: Configuration setting when used for external interrupt source
  * @get_pull: Read the current pull configuration for the GPIO
  * @set_pull: Set the current pull configuraiton for the GPIO
  * @set_config: Set the current configuration for the GPIO
  * @get_config: Read the current configuration for the GPIO
  *
  * Each chip can have more than one type of GPIO bank available and some
  * have different capabilites even when they have the same control register
  * layouts. Provide an point to vector control routine and provide any
  * per-bank configuration information that other systems such as the
  * external interrupt code will need.
  *
  * @sa samsung_gpio_cfgpin
  * @sa s3c_gpio_getcfg
  * @sa s3c_gpio_setpull
  * @sa s3c_gpio_getpull
  */
 struct samsung_gpio_cfg {
 	unsigned int	cfg_eint;

 	samsung_gpio_pull_t	(*get_pull)(struct samsung_gpio_chip *chip, unsigned offs);
 	int		(*set_pull)(struct samsung_gpio_chip *chip, unsigned offs,
 				    samsung_gpio_pull_t pull);

 	unsigned (*get_config)(struct samsung_gpio_chip *chip, unsigned offs);
 	int	 (*set_config)(struct samsung_gpio_chip *chip, unsigned offs,
 			       unsigned config);
 };

 #define S3C_GPIO_SPECIAL_MARK	(0xfffffff0)
 #define S3C_GPIO_SPECIAL(x)	(S3C_GPIO_SPECIAL_MARK | (x))

 /* Defines for generic pin configurations */
 #define S3C_GPIO_INPUT	(S3C_GPIO_SPECIAL(0))
 #define S3C_GPIO_OUTPUT	(S3C_GPIO_SPECIAL(1))
 #define S3C_GPIO_SFN(x)	(S3C_GPIO_SPECIAL(x))

 #define samsung_gpio_is_cfg_special(_cfg) \
 	(((_cfg) & S3C_GPIO_SPECIAL_MARK) == S3C_GPIO_SPECIAL_MARK)

 /**
  * s3c_gpio_cfgpin() - Change the GPIO function of a pin.
  * @pin pin The pin number to configure.
  * @to to The configuration for the pin's function.
  *
  * Configure which function is actually connected to the external
  * pin, such as an gpio input, output or some form of special function
  * connected to an internal peripheral block.
  *
  * The @to parameter can be one of the generic S3C_GPIO_INPUT, S3C_GPIO_OUTPUT
  * or S3C_GPIO_SFN() to indicate one of the possible values that the helper
  * will then generate the correct bit mask and shift for the configuration.
  *
  * If a bank of GPIOs all needs to be set to special-function 2, then
  * the following code will work:
  *
  *	for (gpio = start; gpio < end; gpio++)
  *		s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
  *
  * The @to parameter can also be a specific value already shifted to the
  * correct position in the control register, although these are discouraged
  * in newer kernels and are only being kept for compatibility.
  */
 extern int s3c_gpio_cfgpin(unsigned int pin, unsigned int to);

 /**
  * s3c_gpio_getcfg - Read the current function for a GPIO pin
  * @pin: The pin to read the configuration value for.
  *
  * Read the configuration state of the given @pin, returning a value that
  * could be passed back to s3c_gpio_cfgpin().
  *
  * @sa s3c_gpio_cfgpin
  */
 extern unsigned s3c_gpio_getcfg(unsigned int pin);

 /**
  * s3c_gpio_cfgpin_range() - Change the GPIO function for configuring pin range
  * @start: The pin number to start at
  * @nr: The number of pins to configure from @start.
  * @cfg: The configuration for the pin's function
  *
  * Call s3c_gpio_cfgpin() for the @nr pins starting at @start.
  *
  * @sa s3c_gpio_cfgpin.
  */
 extern int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
 				 unsigned int cfg);

 /* Define values for the pull-{up,down} available for each gpio pin.
  *
  * These values control the state of the weak pull-{up,down} resistors
  * available on most pins on the S3C series. Not all chips support both
  * up or down settings, and it may be dependent on the chip that is being
  * used to whether the particular mode is available.
  */
 #define S3C_GPIO_PULL_NONE	((__force samsung_gpio_pull_t)0x00)
 #define S3C_GPIO_PULL_DOWN	((__force samsung_gpio_pull_t)0x01)
 #define S3C_GPIO_PULL_UP	((__force samsung_gpio_pull_t)0x02)

 /**
  * s3c_gpio_setpull() - set the state of a gpio pin pull resistor
  * @pin: The pin number to configure the pull resistor.
  * @pull: The configuration for the pull resistor.
  *
  * This function sets the state of the pull-{up,down} resistor for the
  * specified pin. It will return 0 if successful, or a negative error
  * code if the pin cannot support the requested pull setting.
  *
  * @pull is one of S3C_GPIO_PULL_NONE, S3C_GPIO_PULL_DOWN or S3C_GPIO_PULL_UP.
 */
 extern int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull);

 /**
  * s3c_gpio_getpull() - get the pull resistor state of a gpio pin
  * @pin: The pin number to get the settings for
  *
  * Read the pull resistor value for the specified pin.
 */
 extern samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin);

 /* configure `all` aspects of an gpio */

 /**
  * s3c_gpio_cfgall_range() - configure range of gpio functtion and pull.
  * @start: The gpio number to start at.
  * @nr: The number of gpio to configure from @start.
  * @cfg: The configuration to use
  * @pull: The pull setting to use.
  *
  * Run s3c_gpio_cfgpin() and s3c_gpio_setpull() over the gpio range starting
  * @gpio and running for @size.
  *
  * @sa s3c_gpio_cfgpin
  * @sa s3c_gpio_setpull
  * @sa s3c_gpio_cfgpin_range
  */
 extern int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
 				 unsigned int cfg, samsung_gpio_pull_t pull);

 static inline int s3c_gpio_cfgrange_nopull(unsigned int pin, unsigned int size,
 					   unsigned int cfg)
 {
 	return s3c_gpio_cfgall_range(pin, size, cfg, S3C_GPIO_PULL_NONE);
 }

 #endif /* __PLAT_GPIO_CFG_H */
	/* linux/arch/arm/plat-s3c/include/plat/gpio-cfg.h
	*
	* Copyright 2008 Openmoko, Inc.
	* Copyright 2008 Simtec Electronics
	* http://armlinux.simtec.co.uk/
	* Ben Dooks <ben@simtec.co.uk>
	*
	* S3C Platform - GPIO pin configuration
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	/* This file contains the necessary definitions to get the basic gpio
	* pin configuration done such as setting a pin to input or output or
	* changing the pull-{up,down} configurations.
	*/

	/* Note, this interface is being added to the s3c64xx arch first and will
	* be added to the s3c24xx systems later.
	*/

	#ifndef __PLAT_GPIO_CFG_H
	#define __PLAT_GPIO_CFG_H __FILE__

	#include <linux/types.h>

	typedef unsigned int __bitwise__ samsung_gpio_pull_t;

	/* forward declaration if gpio-core.h hasn't been included */
	struct samsung_gpio_chip;

	/**
	* struct samsung_gpio_cfg GPIO configuration
	* @cfg_eint: Configuration setting when used for external interrupt source
	* @get_pull: Read the current pull configuration for the GPIO
	* @set_pull: Set the current pull configuraiton for the GPIO
	* @set_config: Set the current configuration for the GPIO
	* @get_config: Read the current configuration for the GPIO
	*
	* Each chip can have more than one type of GPIO bank available and some
	* have different capabilites even when they have the same control register
	* layouts. Provide an point to vector control routine and provide any
	* per-bank configuration information that other systems such as the
	* external interrupt code will need.
	*
	* @sa samsung_gpio_cfgpin
	* @sa s3c_gpio_getcfg
	* @sa s3c_gpio_setpull
	* @sa s3c_gpio_getpull
	*/
	struct samsung_gpio_cfg {
	unsigned int cfg_eint;

	samsung_gpio_pull_t (get_pull)(struct samsung_gpio_chip chip, unsigned offs);
	int (set_pull)(struct samsung_gpio_chip chip, unsigned offs,
	samsung_gpio_pull_t pull);

	unsigned (get_config)(struct samsung_gpio_chip chip, unsigned offs);
	int (set_config)(struct samsung_gpio_chip chip, unsigned offs,
	unsigned config);
	};

	#define S3C_GPIO_SPECIAL_MARK (0xfffffff0)
	#define S3C_GPIO_SPECIAL(x) (S3C_GPIO_SPECIAL_MARK \| (x))

	/* Defines for generic pin configurations */
	#define S3C_GPIO_INPUT (S3C_GPIO_SPECIAL(0))
	#define S3C_GPIO_OUTPUT (S3C_GPIO_SPECIAL(1))
	#define S3C_GPIO_SFN(x) (S3C_GPIO_SPECIAL(x))

	#define samsung_gpio_is_cfg_special(_cfg) \
	(((_cfg) & S3C_GPIO_SPECIAL_MARK) == S3C_GPIO_SPECIAL_MARK)

	/**
	* s3c_gpio_cfgpin() - Change the GPIO function of a pin.
	* @pin pin The pin number to configure.
	* @to to The configuration for the pin's function.
	*
	* Configure which function is actually connected to the external
	* pin, such as an gpio input, output or some form of special function
	* connected to an internal peripheral block.
	*
	* The @to parameter can be one of the generic S3C_GPIO_INPUT, S3C_GPIO_OUTPUT
	* or S3C_GPIO_SFN() to indicate one of the possible values that the helper
	* will then generate the correct bit mask and shift for the configuration.
	*
	* If a bank of GPIOs all needs to be set to special-function 2, then
	* the following code will work:
	*
	* for (gpio = start; gpio < end; gpio++)
	* s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
	*
	* The @to parameter can also be a specific value already shifted to the
	* correct position in the control register, although these are discouraged
	* in newer kernels and are only being kept for compatibility.
	*/
	extern int s3c_gpio_cfgpin(unsigned int pin, unsigned int to);

	/**
	* s3c_gpio_getcfg - Read the current function for a GPIO pin
	* @pin: The pin to read the configuration value for.
	*
	* Read the configuration state of the given @pin, returning a value that
	* could be passed back to s3c_gpio_cfgpin().
	*
	* @sa s3c_gpio_cfgpin
	*/
	extern unsigned s3c_gpio_getcfg(unsigned int pin);

	/**
	* s3c_gpio_cfgpin_range() - Change the GPIO function for configuring pin range
	* @start: The pin number to start at
	* @nr: The number of pins to configure from @start.
	* @cfg: The configuration for the pin's function
	*
	* Call s3c_gpio_cfgpin() for the @nr pins starting at @start.
	*
	* @sa s3c_gpio_cfgpin.
	*/
	extern int s3c_gpio_cfgpin_range(unsigned int start, unsigned int nr,
	unsigned int cfg);

	/* Define values for the pull-{up,down} available for each gpio pin.
	*
	* These values control the state of the weak pull-{up,down} resistors
	* available on most pins on the S3C series. Not all chips support both
	* up or down settings, and it may be dependent on the chip that is being
	* used to whether the particular mode is available.
	*/
	#define S3C_GPIO_PULL_NONE ((__force samsung_gpio_pull_t)0x00)
	#define S3C_GPIO_PULL_DOWN ((__force samsung_gpio_pull_t)0x01)
	#define S3C_GPIO_PULL_UP ((__force samsung_gpio_pull_t)0x02)

	/**
	* s3c_gpio_setpull() - set the state of a gpio pin pull resistor
	* @pin: The pin number to configure the pull resistor.
	* @pull: The configuration for the pull resistor.
	*
	* This function sets the state of the pull-{up,down} resistor for the
	* specified pin. It will return 0 if successful, or a negative error
	* code if the pin cannot support the requested pull setting.
	*
	* @pull is one of S3C_GPIO_PULL_NONE, S3C_GPIO_PULL_DOWN or S3C_GPIO_PULL_UP.
	*/
	extern int s3c_gpio_setpull(unsigned int pin, samsung_gpio_pull_t pull);

	/**
	* s3c_gpio_getpull() - get the pull resistor state of a gpio pin
	* @pin: The pin number to get the settings for
	*
	* Read the pull resistor value for the specified pin.
	*/
	extern samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin);

	/* configure `all` aspects of an gpio */

	/**
	* s3c_gpio_cfgall_range() - configure range of gpio functtion and pull.
	* @start: The gpio number to start at.
	* @nr: The number of gpio to configure from @start.
	* @cfg: The configuration to use
	* @pull: The pull setting to use.
	*
	* Run s3c_gpio_cfgpin() and s3c_gpio_setpull() over the gpio range starting
	* @gpio and running for @size.
	*
	* @sa s3c_gpio_cfgpin
	* @sa s3c_gpio_setpull
	* @sa s3c_gpio_cfgpin_range
	*/
	extern int s3c_gpio_cfgall_range(unsigned int start, unsigned int nr,
	unsigned int cfg, samsung_gpio_pull_t pull);

	static inline int s3c_gpio_cfgrange_nopull(unsigned int pin, unsigned int size,
	unsigned int cfg)
	{
	return s3c_gpio_cfgall_range(pin, size, cfg, S3C_GPIO_PULL_NONE);
	}

	#endif /* __PLAT_GPIO_CFG_H */