arch/arm/plat-samsung/include/plat/gpio-cfg-helpers.h

   1 /* linux/arch/arm/plat-samsung/include/plat/gpio-cfg-helper.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  * Samsung Platform - GPIO pin configuration helper definitions
   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 is meant for core cpu support, machine or other driver files
  16  * should not be including this header.
  17  */
  18
  19 #ifndef __PLAT_GPIO_CFG_HELPERS_H
  20 #define __PLAT_GPIO_CFG_HELPERS_H __FILE__
  21
  22 /* As a note, all gpio configuration functions are entered exclusively, either
  23  * with the relevant lock held or the system prevented from doing anything else
  24  * by disabling interrupts.
  25 */
  26
  27 static inline int samsung_gpio_do_setcfg(struct samsung_gpio_chip *chip,
  28                                          unsigned int off, unsigned int config)
  29 {
  30         return (chip->config->set_config)(chip, off, config);
  31 }
  32
  33 static inline unsigned samsung_gpio_do_getcfg(struct samsung_gpio_chip *chip,
  34                                               unsigned int off)
  35 {
  36         return (chip->config->get_config)(chip, off);
  37 }
  38
  39 static inline int samsung_gpio_do_setpull(struct samsung_gpio_chip *chip,
  40                                           unsigned int off, samsung_gpio_pull_t pull)
  41 {
  42         return (chip->config->set_pull)(chip, off, pull);
  43 }
  44
  45 static inline samsung_gpio_pull_t samsung_gpio_do_getpull(struct samsung_gpio_chip *chip,
  46                                                           unsigned int off)
  47 {
  48         return chip->config->get_pull(chip, off);
  49 }
  50
  51 /* Pull-{up,down} resistor controls.
  52  *
  53  * S3C2410,S3C2440 = Pull-UP,
  54  * S3C2412,S3C2413 = Pull-Down
  55  * S3C6400,S3C6410 = Pull-Both [None,Down,Up,Undef]
  56  * S3C2443 = Pull-Both [not same as S3C6400]
  57  */
  58
  59 /**
  60  * s3c24xx_gpio_setpull_1up() - Pull configuration for choice of up or none.
  61  * @chip: The gpio chip that is being configured.
  62  * @off: The offset for the GPIO being configured.
  63  * @param: pull: The pull mode being requested.
  64  *
  65  * This is a helper function for the case where we have GPIOs with one
  66  * bit configuring the presence of a pull-up resistor.
  67  */
  68 extern int s3c24xx_gpio_setpull_1up(struct samsung_gpio_chip *chip,
  69                                     unsigned int off, samsung_gpio_pull_t pull);
  70
  71 /**
  72  * s3c24xx_gpio_setpull_1down() - Pull configuration for choice of down or none
  73  * @chip: The gpio chip that is being configured
  74  * @off: The offset for the GPIO being configured
  75  * @param: pull: The pull mode being requested
  76  *
  77  * This is a helper function for the case where we have GPIOs with one
  78  * bit configuring the presence of a pull-down resistor.
  79  */
  80 extern int s3c24xx_gpio_setpull_1down(struct samsung_gpio_chip *chip,
  81                                       unsigned int off, samsung_gpio_pull_t pull);
  82
  83 /**
  84  * samsung_gpio_setpull_upown() - Pull configuration for choice of up,
  85  * down or none
  86  *
  87  * @chip: The gpio chip that is being configured.
  88  * @off: The offset for the GPIO being configured.
  89  * @param: pull: The pull mode being requested.
  90  *
  91  * This is a helper function for the case where we have GPIOs with two
  92  * bits configuring the presence of a pull resistor, in the following
  93  * order:
  94  *      00 = No pull resistor connected
  95  *      01 = Pull-up resistor connected
  96  *      10 = Pull-down resistor connected
  97  */
  98 extern int samsung_gpio_setpull_updown(struct samsung_gpio_chip *chip,
  99                                        unsigned int off, samsung_gpio_pull_t pull);
 100
 101 /**
 102  * samsung_gpio_getpull_updown() - Get configuration for choice of up,
 103  * down or none
 104  *
 105  * @chip: The gpio chip that the GPIO pin belongs to
 106  * @off: The offset to the pin to get the configuration of.
 107  *
 108  * This helper function reads the state of the pull-{up,down} resistor
 109  * for the given GPIO in the same case as samsung_gpio_setpull_upown.
 110 */
 111 extern samsung_gpio_pull_t samsung_gpio_getpull_updown(struct samsung_gpio_chip *chip,
 112                                                        unsigned int off);
 113
 114 /**
 115  * s3c24xx_gpio_getpull_1up() - Get configuration for choice of up or none
 116  * @chip: The gpio chip that the GPIO pin belongs to
 117  * @off: The offset to the pin to get the configuration of.
 118  *
 119  * This helper function reads the state of the pull-up resistor for the
 120  * given GPIO in the same case as s3c24xx_gpio_setpull_1up.
 121 */
 122 extern samsung_gpio_pull_t s3c24xx_gpio_getpull_1up(struct samsung_gpio_chip *chip,
 123                                                     unsigned int off);
 124
 125 /**
 126  * s3c24xx_gpio_getpull_1down() - Get configuration for choice of down or none
 127  * @chip: The gpio chip that the GPIO pin belongs to
 128  * @off: The offset to the pin to get the configuration of.
 129  *
 130  * This helper function reads the state of the pull-down resistor for the
 131  * given GPIO in the same case as s3c24xx_gpio_setpull_1down.
 132 */
 133 extern samsung_gpio_pull_t s3c24xx_gpio_getpull_1down(struct samsung_gpio_chip *chip,
 134                                                       unsigned int off);
 135
 136 /**
 137  * s3c2443_gpio_setpull() - Pull configuration for s3c2443.
 138  * @chip: The gpio chip that is being configured.
 139  * @off: The offset for the GPIO being configured.
 140  * @param: pull: The pull mode being requested.
 141  *
 142  * This is a helper function for the case where we have GPIOs with two
 143  * bits configuring the presence of a pull resistor, in the following
 144  * order:
 145  *      00 = Pull-up resistor connected
 146  *      10 = Pull-down resistor connected
 147  *      x1 = No pull up resistor
 148  */
 149 extern int s3c2443_gpio_setpull(struct samsung_gpio_chip *chip,
 150                                 unsigned int off, samsung_gpio_pull_t pull);
 151
 152 /**
 153  * s3c2443_gpio_getpull() - Get configuration for s3c2443 pull resistors
 154  * @chip: The gpio chip that the GPIO pin belongs to.
 155  * @off: The offset to the pin to get the configuration of.
 156  *
 157  * This helper function reads the state of the pull-{up,down} resistor for the
 158  * given GPIO in the same case as samsung_gpio_setpull_upown.
 159 */
 160 extern samsung_gpio_pull_t s3c2443_gpio_getpull(struct samsung_gpio_chip *chip,
 161                                                 unsigned int off);
 162
 163 #endif /* __PLAT_GPIO_CFG_HELPERS_H */