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

   1 /* linux/arch/arm/plat-s3c/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  * S3C 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 s3c_gpio_do_setcfg(struct s3c_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 s3c_gpio_do_getcfg(struct s3c_gpio_chip *chip,
  34                                           unsigned int off)
  35 {
  36         return (chip->config->get_config)(chip, off);
  37 }
  38
  39 static inline int s3c_gpio_do_setpull(struct s3c_gpio_chip *chip,
  40                                       unsigned int off, s3c_gpio_pull_t pull)
  41 {
  42         return (chip->config->set_pull)(chip, off, pull);
  43 }
  44
  45 static inline s3c_gpio_pull_t s3c_gpio_do_getpull(struct s3c_gpio_chip *chip,
  46                                                   unsigned int off)
  47 {
  48         return chip->config->get_pull(chip, off);
  49 }
  50
  51 /**
  52  * s3c_gpio_setcfg_s3c24xx - S3C24XX style GPIO configuration.
  53  * @chip: The gpio chip that is being configured.
  54  * @off: The offset for the GPIO being configured.
  55  * @cfg: The configuration value to set.
  56  *
  57  * This helper deal with the GPIO cases where the control register
  58  * has two bits of configuration per gpio, which have the following
  59  * functions:
  60  *      00 = input
  61  *      01 = output
  62  *      1x = special function
  63 */
  64 extern int s3c_gpio_setcfg_s3c24xx(struct s3c_gpio_chip *chip,
  65                                    unsigned int off, unsigned int cfg);
  66
  67 /**
  68  * s3c_gpio_getcfg_s3c24xx - S3C24XX style GPIO configuration read.
  69  * @chip: The gpio chip that is being configured.
  70  * @off: The offset for the GPIO being configured.
  71  *
  72  * The reverse of s3c_gpio_setcfg_s3c24xx(). Will return a value whicg
  73  * could be directly passed back to s3c_gpio_setcfg_s3c24xx(), from the
  74  * S3C_GPIO_SPECIAL() macro.
  75  */
  76 unsigned int s3c_gpio_getcfg_s3c24xx(struct s3c_gpio_chip *chip,
  77                                      unsigned int off);
  78
  79 /**
  80  * s3c_gpio_setcfg_s3c24xx_a - S3C24XX style GPIO configuration (Bank A)
  81  * @chip: The gpio chip that is being configured.
  82  * @off: The offset for the GPIO being configured.
  83  * @cfg: The configuration value to set.
  84  *
  85  * This helper deal with the GPIO cases where the control register
  86  * has one bit of configuration for the gpio, where setting the bit
  87  * means the pin is in special function mode and unset means output.
  88 */
  89 extern int s3c_gpio_setcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
  90                                      unsigned int off, unsigned int cfg);
  91
  92
  93 /**
  94  * s3c_gpio_getcfg_s3c24xx_a - S3C24XX style GPIO configuration read (Bank A)
  95  * @chip: The gpio chip that is being configured.
  96  * @off: The offset for the GPIO being configured.
  97  *
  98  * The reverse of s3c_gpio_setcfg_s3c24xx_a() turning an GPIO into a usable
  99  * GPIO configuration value.
 100  *
 101  * @sa s3c_gpio_getcfg_s3c24xx
 102  * @sa s3c_gpio_getcfg_s3c64xx_4bit
 103  */
 104 extern unsigned s3c_gpio_getcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
 105                                           unsigned int off);
 106
 107 /**
 108  * s3c_gpio_setcfg_s3c64xx_4bit - S3C64XX 4bit single register GPIO config.
 109  * @chip: The gpio chip that is being configured.
 110  * @off: The offset for the GPIO being configured.
 111  * @cfg: The configuration value to set.
 112  *
 113  * This helper deal with the GPIO cases where the control register has 4 bits
 114  * of control per GPIO, generally in the form of:
 115  *      0000 = Input
 116  *      0001 = Output
 117  *      others = Special functions (dependent on bank)
 118  *
 119  * Note, since the code to deal with the case where there are two control
 120  * registers instead of one, we do not have a separate set of functions for
 121  * each case.
 122 */
 123 extern int s3c_gpio_setcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
 124                                         unsigned int off, unsigned int cfg);
 125
 126
 127 /**
 128  * s3c_gpio_getcfg_s3c64xx_4bit - S3C64XX 4bit single register GPIO config read.
 129  * @chip: The gpio chip that is being configured.
 130  * @off: The offset for the GPIO being configured.
 131  *
 132  * The reverse of s3c_gpio_setcfg_s3c64xx_4bit(), turning a gpio configuration
 133  * register setting into a value the software can use, such as could be passed
 134  * to s3c_gpio_setcfg_s3c64xx_4bit().
 135  *
 136  * @sa s3c_gpio_getcfg_s3c24xx
 137  */
 138 extern unsigned s3c_gpio_getcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
 139                                              unsigned int off);
 140
 141 /* Pull-{up,down} resistor controls.
 142  *
 143  * S3C2410,S3C2440,S3C24A0 = Pull-UP,
 144  * S3C2412,S3C2413 = Pull-Down
 145  * S3C6400,S3C6410 = Pull-Both [None,Down,Up,Undef]
 146  * S3C2443 = Pull-Both [not same as S3C6400]
 147  */
 148
 149 /**
 150  * s3c_gpio_setpull_1up() - Pull configuration for choice of up or none.
 151  * @chip: The gpio chip that is being configured.
 152  * @off: The offset for the GPIO being configured.
 153  * @param: pull: The pull mode being requested.
 154  *
 155  * This is a helper function for the case where we have GPIOs with one
 156  * bit configuring the presence of a pull-up resistor.
 157  */
 158 extern int s3c_gpio_setpull_1up(struct s3c_gpio_chip *chip,
 159                                 unsigned int off, s3c_gpio_pull_t pull);
 160
 161 /**
 162  * s3c_gpio_setpull_1down() - Pull configuration for choice of down or none
 163  * @chip: The gpio chip that is being configured
 164  * @off: The offset for the GPIO being configured
 165  * @param: pull: The pull mode being requested
 166  *
 167  * This is a helper function for the case where we have GPIOs with one
 168  * bit configuring the presence of a pull-down resistor.
 169  */
 170 extern int s3c_gpio_setpull_1down(struct s3c_gpio_chip *chip,
 171                                   unsigned int off, s3c_gpio_pull_t pull);
 172
 173 /**
 174  * s3c_gpio_setpull_upown() - Pull configuration for choice of up, down or none
 175  * @chip: The gpio chip that is being configured.
 176  * @off: The offset for the GPIO being configured.
 177  * @param: pull: The pull mode being requested.
 178  *
 179  * This is a helper function for the case where we have GPIOs with two
 180  * bits configuring the presence of a pull resistor, in the following
 181  * order:
 182  *      00 = No pull resistor connected
 183  *      01 = Pull-up resistor connected
 184  *      10 = Pull-down resistor connected
 185  */
 186 extern int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip,
 187                                    unsigned int off, s3c_gpio_pull_t pull);
 188
 189
 190 /**
 191  * s3c_gpio_getpull_updown() - Get configuration for choice of up, down or none
 192  * @chip: The gpio chip that the GPIO pin belongs to
 193  * @off: The offset to the pin to get the configuration of.
 194  *
 195  * This helper function reads the state of the pull-{up,down} resistor for the
 196  * given GPIO in the same case as s3c_gpio_setpull_upown.
 197 */
 198 extern s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
 199                                                unsigned int off);
 200
 201 /**
 202  * s3c_gpio_getpull_1up() - Get configuration for choice of up or none
 203  * @chip: The gpio chip that the GPIO pin belongs to
 204  * @off: The offset to the pin to get the configuration of.
 205  *
 206  * This helper function reads the state of the pull-up resistor for the
 207  * given GPIO in the same case as s3c_gpio_setpull_1up.
 208 */
 209 extern s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip,
 210                                             unsigned int off);
 211
 212 /**
 213  * s3c_gpio_getpull_1down() - Get configuration for choice of down or none
 214  * @chip: The gpio chip that the GPIO pin belongs to
 215  * @off: The offset to the pin to get the configuration of.
 216  *
 217  * This helper function reads the state of the pull-down resistor for the
 218  * given GPIO in the same case as s3c_gpio_setpull_1down.
 219 */
 220 extern s3c_gpio_pull_t s3c_gpio_getpull_1down(struct s3c_gpio_chip *chip,
 221                                             unsigned int off);
 222
 223 /**
 224  * s3c_gpio_setpull_s3c2443() - Pull configuration for s3c2443.
 225  * @chip: The gpio chip that is being configured.
 226  * @off: The offset for the GPIO being configured.
 227  * @param: pull: The pull mode being requested.
 228  *
 229  * This is a helper function for the case where we have GPIOs with two
 230  * bits configuring the presence of a pull resistor, in the following
 231  * order:
 232  *      00 = Pull-up resistor connected
 233  *      10 = Pull-down resistor connected
 234  *      x1 = No pull up resistor
 235  */
 236 extern int s3c_gpio_setpull_s3c2443(struct s3c_gpio_chip *chip,
 237                                     unsigned int off, s3c_gpio_pull_t pull);
 238
 239 /**
 240  * s3c_gpio_getpull_s3c2443() - Get configuration for s3c2443 pull resistors
 241  * @chip: The gpio chip that the GPIO pin belongs to.
 242  * @off: The offset to the pin to get the configuration of.
 243  *
 244  * This helper function reads the state of the pull-{up,down} resistor for the
 245  * given GPIO in the same case as s3c_gpio_setpull_upown.
 246 */
 247 extern s3c_gpio_pull_t s3c_gpio_getpull_s3c2443(struct s3c_gpio_chip *chip,
 248                                                 unsigned int off);
 249
 250 #endif /* __PLAT_GPIO_CFG_HELPERS_H */
 251