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 /**
  46  * s3c_gpio_setcfg_s3c24xx - S3C24XX style GPIO configuration.
  47  * @chip: The gpio chip that is being configured.
  48  * @off: The offset for the GPIO being configured.
  49  * @cfg: The configuration value to set.
  50  *
  51  * This helper deal with the GPIO cases where the control register
  52  * has two bits of configuration per gpio, which have the following
  53  * functions:
  54  *      00 = input
  55  *      01 = output
  56  *      1x = special function
  57 */
  58 extern int s3c_gpio_setcfg_s3c24xx(struct s3c_gpio_chip *chip,
  59                                    unsigned int off, unsigned int cfg);
  60
  61 /**
  62  * s3c_gpio_getcfg_s3c24xx - S3C24XX style GPIO configuration read.
  63  * @chip: The gpio chip that is being configured.
  64  * @off: The offset for the GPIO being configured.
  65  *
  66  * The reverse of s3c_gpio_setcfg_s3c24xx(). Will return a value whicg
  67  * could be directly passed back to s3c_gpio_setcfg_s3c24xx(), from the
  68  * S3C_GPIO_SPECIAL() macro.
  69  */
  70 unsigned int s3c_gpio_getcfg_s3c24xx(struct s3c_gpio_chip *chip,
  71                                      unsigned int off);
  72
  73 /**
  74  * s3c_gpio_setcfg_s3c24xx_a - S3C24XX style GPIO configuration (Bank A)
  75  * @chip: The gpio chip that is being configured.
  76  * @off: The offset for the GPIO being configured.
  77  * @cfg: The configuration value to set.
  78  *
  79  * This helper deal with the GPIO cases where the control register
  80  * has one bit of configuration for the gpio, where setting the bit
  81  * means the pin is in special function mode and unset means output.
  82 */
  83 extern int s3c_gpio_setcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
  84                                      unsigned int off, unsigned int cfg);
  85
  86
  87 /**
  88  * s3c_gpio_getcfg_s3c24xx_a - S3C24XX style GPIO configuration read (Bank A)
  89  * @chip: The gpio chip that is being configured.
  90  * @off: The offset for the GPIO being configured.
  91  *
  92  * The reverse of s3c_gpio_setcfg_s3c24xx_a() turning an GPIO into a usable
  93  * GPIO configuration value.
  94  *
  95  * @sa s3c_gpio_getcfg_s3c24xx
  96  * @sa s3c_gpio_getcfg_s3c64xx_4bit
  97  */
  98 extern unsigned s3c_gpio_getcfg_s3c24xx_a(struct s3c_gpio_chip *chip,
  99                                           unsigned int off);
 100
 101 /**
 102  * s3c_gpio_setcfg_s3c64xx_4bit - S3C64XX 4bit single register GPIO config.
 103  * @chip: The gpio chip that is being configured.
 104  * @off: The offset for the GPIO being configured.
 105  * @cfg: The configuration value to set.
 106  *
 107  * This helper deal with the GPIO cases where the control register has 4 bits
 108  * of control per GPIO, generally in the form of:
 109  *      0000 = Input
 110  *      0001 = Output
 111  *      others = Special functions (dependant on bank)
 112  *
 113  * Note, since the code to deal with the case where there are two control
 114  * registers instead of one, we do not have a separate set of functions for
 115  * each case.
 116 */
 117 extern int s3c_gpio_setcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
 118                                         unsigned int off, unsigned int cfg);
 119
 120
 121 /**
 122  * s3c_gpio_getcfg_s3c64xx_4bit - S3C64XX 4bit single register GPIO config read.
 123  * @chip: The gpio chip that is being configured.
 124  * @off: The offset for the GPIO being configured.
 125  *
 126  * The reverse of s3c_gpio_setcfg_s3c64xx_4bit(), turning a gpio configuration
 127  * register setting into a value the software can use, such as could be passed
 128  * to s3c_gpio_setcfg_s3c64xx_4bit().
 129  *
 130  * @sa s3c_gpio_getcfg_s3c24xx
 131  */
 132 extern unsigned s3c_gpio_getcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip,
 133                                              unsigned int off);
 134
 135 /* Pull-{up,down} resistor controls.
 136  *
 137  * S3C2410,S3C2440,S3C24A0 = Pull-UP,
 138  * S3C2412,S3C2413 = Pull-Down
 139  * S3C6400,S3C6410 = Pull-Both [None,Down,Up,Undef]
 140  * S3C2443 = Pull-Both [not same as S3C6400]
 141  */
 142
 143 /**
 144  * s3c_gpio_setpull_1up() - Pull configuration for choice of up or none.
 145  * @chip: The gpio chip that is being configured.
 146  * @off: The offset for the GPIO being configured.
 147  * @param: pull: The pull mode being requested.
 148  *
 149  * This is a helper function for the case where we have GPIOs with one
 150  * bit configuring the presence of a pull-up resistor.
 151  */
 152 extern int s3c_gpio_setpull_1up(struct s3c_gpio_chip *chip,
 153                                 unsigned int off, s3c_gpio_pull_t pull);
 154
 155 /**
 156  * s3c_gpio_setpull_1down() - Pull configuration for choice of down or none
 157  * @chip: The gpio chip that is being configured
 158  * @off: The offset for the GPIO being configured
 159  * @param: pull: The pull mode being requested
 160  *
 161  * This is a helper function for the case where we have GPIOs with one
 162  * bit configuring the presence of a pull-down resistor.
 163  */
 164 extern int s3c_gpio_setpull_1down(struct s3c_gpio_chip *chip,
 165                                   unsigned int off, s3c_gpio_pull_t pull);
 166
 167 /**
 168  * s3c_gpio_setpull_upown() - Pull configuration for choice of up, down or none
 169  * @chip: The gpio chip that is being configured.
 170  * @off: The offset for the GPIO being configured.
 171  * @param: pull: The pull mode being requested.
 172  *
 173  * This is a helper function for the case where we have GPIOs with two
 174  * bits configuring the presence of a pull resistor, in the following
 175  * order:
 176  *      00 = No pull resistor connected
 177  *      01 = Pull-up resistor connected
 178  *      10 = Pull-down resistor connected
 179  */
 180 extern int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip,
 181                                    unsigned int off, s3c_gpio_pull_t pull);
 182
 183
 184 /**
 185  * s3c_gpio_getpull_updown() - Get configuration for choice of up, down or none
 186  * @chip: The gpio chip that the GPIO pin belongs to
 187  * @off: The offset to the pin to get the configuration of.
 188  *
 189  * This helper function reads the state of the pull-{up,down} resistor for the
 190  * given GPIO in the same case as s3c_gpio_setpull_upown.
 191 */
 192 extern s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip,
 193                                                unsigned int off);
 194
 195 /**
 196  * s3c_gpio_getpull_1up() - Get configuration for choice of up or none
 197  * @chip: The gpio chip that the GPIO pin belongs to
 198  * @off: The offset to the pin to get the configuration of.
 199  *
 200  * This helper function reads the state of the pull-up resistor for the
 201  * given GPIO in the same case as s3c_gpio_setpull_1up.
 202 */
 203 extern s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip,
 204                                             unsigned int off);
 205
 206 /**
 207  * s3c_gpio_setpull_s3c2443() - Pull configuration for s3c2443.
 208  * @chip: The gpio chip that is being configured.
 209  * @off: The offset for the GPIO being configured.
 210  * @param: pull: The pull mode being requested.
 211  *
 212  * This is a helper function for the case where we have GPIOs with two
 213  * bits configuring the presence of a pull resistor, in the following
 214  * order:
 215  *      00 = Pull-up resistor connected
 216  *      10 = Pull-down resistor connected
 217  *      x1 = No pull up resistor
 218  */
 219 extern int s3c_gpio_setpull_s3c2443(struct s3c_gpio_chip *chip,
 220                                     unsigned int off, s3c_gpio_pull_t pull);
 221
 222 /**
 223  * s3c_gpio_getpull_s3c2443() - Get configuration for s3c2443 pull resistors
 224  * @chip: The gpio chip that the GPIO pin belongs to.
 225  * @off: The offset to the pin to get the configuration of.
 226  *
 227  * This helper function reads the state of the pull-{up,down} resistor for the
 228  * given GPIO in the same case as s3c_gpio_setpull_upown.
 229 */
 230 extern s3c_gpio_pull_t s3c_gpio_getpull_s3c24xx(struct s3c_gpio_chip *chip,
 231                                                 unsigned int off);
 232
 233 #endif /* __PLAT_GPIO_CFG_HELPERS_H */
 234