git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| 21b23664 BD |
1 | /* linux/arch/arm/plat-s3c/include/plat/gpio-cfg.h |
| 2 | * | |
| 3 | * Copyright 2008 Openmoko, Inc. | |
| 4 | * Copyright 2008 Simtec Electronics | |
| 5 | * http://armlinux.simtec.co.uk/ | |
| 6 | * Ben Dooks <ben@simtec.co.uk> | |
| 7 | * | |
| 8 | * S3C Platform - GPIO pin configuration | |
| 9 | * | |
| 10 | * This program is free software; you can redistribute it and/or modify | |
| 11 | * it under the terms of the GNU General Public License version 2 as | |
| 12 | * published by the Free Software Foundation. | |
| 13 | */ | |
| 14 | ||
| 15 | /* This file contains the necessary definitions to get the basic gpio | |
| 16 | * pin configuration done such as setting a pin to input or output or | |
| 17 | * changing the pull-{up,down} configurations. | |
| 18 | */ | |
| 19 | ||
| 20 | /* Note, this interface is being added to the s3c64xx arch first and will | |
| 21 | * be added to the s3c24xx systems later. | |
| 22 | */ | |
| 23 | ||
| 24 | #ifndef __PLAT_GPIO_CFG_H | |
| 25 | #define __PLAT_GPIO_CFG_H __FILE__ | |
| 26 | ||
| 27 | typedef unsigned int __bitwise__ s3c_gpio_pull_t; | |
| 28 | ||
| 29 | /* forward declaration if gpio-core.h hasn't been included */ | |
| 30 | struct s3c_gpio_chip; | |
| 31 | ||
| 32 | /** | |
| 33 | * struct s3c_gpio_cfg GPIO configuration | |
| 34 | * @cfg_eint: Configuration setting when used for external interrupt source | |
| 35 | * @get_pull: Read the current pull configuration for the GPIO | |
| 36 | * @set_pull: Set the current pull configuraiton for the GPIO | |
| 37 | * @set_config: Set the current configuration for the GPIO | |
| 38 | * @get_config: Read the current configuration for the GPIO | |
| 39 | * | |
| 40 | * Each chip can have more than one type of GPIO bank available and some | |
| 41 | * have different capabilites even when they have the same control register | |
| 42 | * layouts. Provide an point to vector control routine and provide any | |
| 43 | * per-bank configuration information that other systems such as the | |
| 44 | * external interrupt code will need. | |
| 45 | */ | |
| 46 | struct s3c_gpio_cfg { | |
| 47 | unsigned int cfg_eint; | |
| 48 | ||
| 49 | s3c_gpio_pull_t (*get_pull)(struct s3c_gpio_chip *chip, unsigned offs); | |
| 50 | int (*set_pull)(struct s3c_gpio_chip *chip, unsigned offs, | |
| 51 | s3c_gpio_pull_t pull); | |
| 52 | ||
| 53 | unsigned (*get_config)(struct s3c_gpio_chip *chip, unsigned offs); | |
| 54 | int (*set_config)(struct s3c_gpio_chip *chip, unsigned offs, | |
| 55 | unsigned config); | |
| 56 | }; | |
| 57 | ||
| 58 | #define S3C_GPIO_SPECIAL_MARK (0xfffffff0) | |
| 59 | #define S3C_GPIO_SPECIAL(x) (S3C_GPIO_SPECIAL_MARK | (x)) | |
| 60 | ||
| 61 | /* Defines for generic pin configurations */ | |
| 62 | #define S3C_GPIO_INPUT (S3C_GPIO_SPECIAL(0)) | |
| 63 | #define S3C_GPIO_OUTPUT (S3C_GPIO_SPECIAL(1)) | |
| 64 | #define S3C_GPIO_SFN(x) (S3C_GPIO_SPECIAL(x)) | |
| 65 | ||
| 66 | #define s3c_gpio_is_cfg_special(_cfg) \ | |
| 67 | (((_cfg) & S3C_GPIO_SPECIAL_MARK) == S3C_GPIO_SPECIAL_MARK) | |
| 68 | ||
| 69 | /** | |
| 70 | * s3c_gpio_cfgpin() - Change the GPIO function of a pin. | |
| 71 | * @pin pin The pin number to configure. | |
| 72 | * @pin to The configuration for the pin's function. | |
| 73 | * | |
| 74 | * Configure which function is actually connected to the external | |
| 75 | * pin, such as an gpio input, output or some form of special function | |
| 76 | * connected to an internal peripheral block. | |
| 77 | */ | |
| 78 | extern int s3c_gpio_cfgpin(unsigned int pin, unsigned int to); | |
| 79 | ||
| 9933847b BD |
80 | /** |
| 81 | * s3c_gpio_getcfg - Read the current function for a GPIO pin | |
| 82 | * @pin: The pin to read the configuration value for. | |
| 83 | * | |
| 84 | * Read the configuration state of the given @pin, returning a value that | |
| 85 | * could be passed back to s3c_gpio_cfgpin(). | |
| 86 | * | |
| 87 | * @sa s3c_gpio_cfgpin | |
| 88 | */ | |
| 89 | extern unsigned s3c_gpio_getcfg(unsigned int pin); | |
| 90 | ||
| 21b23664 BD |
91 | /* Define values for the pull-{up,down} available for each gpio pin. |
| 92 | * | |
| 93 | * These values control the state of the weak pull-{up,down} resistors | |
| 94 | * available on most pins on the S3C series. Not all chips support both | |
| 95 | * up or down settings, and it may be dependant on the chip that is being | |
| 96 | * used to whether the particular mode is available. | |
| 97 | */ | |
| 98 | #define S3C_GPIO_PULL_NONE ((__force s3c_gpio_pull_t)0x00) | |
| 99 | #define S3C_GPIO_PULL_DOWN ((__force s3c_gpio_pull_t)0x01) | |
| 100 | #define S3C_GPIO_PULL_UP ((__force s3c_gpio_pull_t)0x02) | |
| 101 | ||
| 102 | /** | |
| 103 | * s3c_gpio_setpull() - set the state of a gpio pin pull resistor | |
| 104 | * @pin: The pin number to configure the pull resistor. | |
| 105 | * @pull: The configuration for the pull resistor. | |
| 106 | * | |
| 107 | * This function sets the state of the pull-{up,down} resistor for the | |
| 108 | * specified pin. It will return 0 if successfull, or a negative error | |
| 109 | * code if the pin cannot support the requested pull setting. | |
| 110 | */ | |
| 111 | extern int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull); | |
| 112 | ||
| 113 | /** | |
| 114 | * s3c_gpio_getpull() - get the pull resistor state of a gpio pin | |
| 115 | * @pin: The pin number to get the settings for | |
| 116 | * | |
| 117 | * Read the pull resistor value for the specified pin. | |
| 118 | */ | |
| 119 | extern s3c_gpio_pull_t s3c_gpio_getpull(unsigned int pin); | |
| 120 | ||
| 121 | #endif /* __PLAT_GPIO_CFG_H */ |