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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   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
  11 /* This is meant for core cpu support, machine or other driver files
  12  * should not be including this header.
  13  */
  14
  15 #ifndef __PLAT_GPIO_CFG_HELPERS_H
  16 #define __PLAT_GPIO_CFG_HELPERS_H __FILE__
  17
  18 /* As a note, all gpio configuration functions are entered exclusively, either
  19  * with the relevant lock held or the system prevented from doing anything else
  20  * by disabling interrupts.
  21 */
  22
  23 static inline int samsung_gpio_do_setcfg(struct samsung_gpio_chip *chip,
  24                                          unsigned int off, unsigned int config)
  25 {
  26         return (chip->config->set_config)(chip, off, config);
  27 }
  28
  29 static inline unsigned samsung_gpio_do_getcfg(struct samsung_gpio_chip *chip,
  30                                               unsigned int off)
  31 {
  32         return (chip->config->get_config)(chip, off);
  33 }
  34
  35 static inline int samsung_gpio_do_setpull(struct samsung_gpio_chip *chip,
  36                                           unsigned int off, samsung_gpio_pull_t pull)
  37 {
  38         return (chip->config->set_pull)(chip, off, pull);
  39 }
  40
  41 static inline samsung_gpio_pull_t samsung_gpio_do_getpull(struct samsung_gpio_chip *chip,
  42                                                           unsigned int off)
  43 {
  44         return chip->config->get_pull(chip, off);
  45 }
  46
  47 /* Pull-{up,down} resistor controls.
  48  *
  49  * S3C2410,S3C2440 = Pull-UP,
  50  * S3C2412,S3C2413 = Pull-Down
  51  * S3C6400,S3C6410 = Pull-Both [None,Down,Up,Undef]
  52  * S3C2443 = Pull-Both [not same as S3C6400]
  53  */
  54
  55 /**
  56  * s3c24xx_gpio_setpull_1up() - Pull configuration for choice of up or none.
  57  * @chip: The gpio chip that is being configured.
  58  * @off: The offset for the GPIO being configured.
  59  * @param: pull: The pull mode being requested.
  60  *
  61  * This is a helper function for the case where we have GPIOs with one
  62  * bit configuring the presence of a pull-up resistor.
  63  */
  64 extern int s3c24xx_gpio_setpull_1up(struct samsung_gpio_chip *chip,
  65                                     unsigned int off, samsung_gpio_pull_t pull);
  66
  67 /**
  68  * s3c24xx_gpio_setpull_1down() - Pull configuration for choice of down or none
  69  * @chip: The gpio chip that is being configured
  70  * @off: The offset for the GPIO being configured
  71  * @param: pull: The pull mode being requested
  72  *
  73  * This is a helper function for the case where we have GPIOs with one
  74  * bit configuring the presence of a pull-down resistor.
  75  */
  76 extern int s3c24xx_gpio_setpull_1down(struct samsung_gpio_chip *chip,
  77                                       unsigned int off, samsung_gpio_pull_t pull);
  78
  79 /**
  80  * samsung_gpio_setpull_upown() - Pull configuration for choice of up,
  81  * down or none
  82  *
  83  * @chip: The gpio chip that is being configured.
  84  * @off: The offset for the GPIO being configured.
  85  * @param: pull: The pull mode being requested.
  86  *
  87  * This is a helper function for the case where we have GPIOs with two
  88  * bits configuring the presence of a pull resistor, in the following
  89  * order:
  90  *      00 = No pull resistor connected
  91  *      01 = Pull-up resistor connected
  92  *      10 = Pull-down resistor connected
  93  */
  94 extern int samsung_gpio_setpull_updown(struct samsung_gpio_chip *chip,
  95                                        unsigned int off, samsung_gpio_pull_t pull);
  96
  97 /**
  98  * samsung_gpio_getpull_updown() - Get configuration for choice of up,
  99  * down or none
 100  *
 101  * @chip: The gpio chip that the GPIO pin belongs to
 102  * @off: The offset to the pin to get the configuration of.
 103  *
 104  * This helper function reads the state of the pull-{up,down} resistor
 105  * for the given GPIO in the same case as samsung_gpio_setpull_upown.
 106 */
 107 extern samsung_gpio_pull_t samsung_gpio_getpull_updown(struct samsung_gpio_chip *chip,
 108                                                        unsigned int off);
 109
 110 /**
 111  * s3c24xx_gpio_getpull_1up() - Get configuration for choice of up or none
 112  * @chip: The gpio chip that the GPIO pin belongs to
 113  * @off: The offset to the pin to get the configuration of.
 114  *
 115  * This helper function reads the state of the pull-up resistor for the
 116  * given GPIO in the same case as s3c24xx_gpio_setpull_1up.
 117 */
 118 extern samsung_gpio_pull_t s3c24xx_gpio_getpull_1up(struct samsung_gpio_chip *chip,
 119                                                     unsigned int off);
 120
 121 /**
 122  * s3c24xx_gpio_getpull_1down() - Get configuration for choice of down or none
 123  * @chip: The gpio chip that the GPIO pin belongs to
 124  * @off: The offset to the pin to get the configuration of.
 125  *
 126  * This helper function reads the state of the pull-down resistor for the
 127  * given GPIO in the same case as s3c24xx_gpio_setpull_1down.
 128 */
 129 extern samsung_gpio_pull_t s3c24xx_gpio_getpull_1down(struct samsung_gpio_chip *chip,
 130                                                       unsigned int off);
 131
 132 /**
 133  * s3c2443_gpio_setpull() - Pull configuration for s3c2443.
 134  * @chip: The gpio chip that is being configured.
 135  * @off: The offset for the GPIO being configured.
 136  * @param: pull: The pull mode being requested.
 137  *
 138  * This is a helper function for the case where we have GPIOs with two
 139  * bits configuring the presence of a pull resistor, in the following
 140  * order:
 141  *      00 = Pull-up resistor connected
 142  *      10 = Pull-down resistor connected
 143  *      x1 = No pull up resistor
 144  */
 145 extern int s3c2443_gpio_setpull(struct samsung_gpio_chip *chip,
 146                                 unsigned int off, samsung_gpio_pull_t pull);
 147
 148 /**
 149  * s3c2443_gpio_getpull() - Get configuration for s3c2443 pull resistors
 150  * @chip: The gpio chip that the GPIO pin belongs to.
 151  * @off: The offset to the pin to get the configuration of.
 152  *
 153  * This helper function reads the state of the pull-{up,down} resistor for the
 154  * given GPIO in the same case as samsung_gpio_setpull_upown.
 155 */
 156 extern samsung_gpio_pull_t s3c2443_gpio_getpull(struct samsung_gpio_chip *chip,
 157                                                 unsigned int off);
 158
 159 #endif /* __PLAT_GPIO_CFG_HELPERS_H */