diff options
Diffstat (limited to 'arch/arm/plat-samsung/include/plat/gpio-cfg.h')
| -rw-r--r-- | arch/arm/plat-samsung/include/plat/gpio-cfg.h | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/arch/arm/plat-samsung/include/plat/gpio-cfg.h b/arch/arm/plat-samsung/include/plat/gpio-cfg.h index 29cd6a86cade..db4112c6f2be 100644 --- a/arch/arm/plat-samsung/include/plat/gpio-cfg.h +++ b/arch/arm/plat-samsung/include/plat/gpio-cfg.h @@ -25,6 +25,7 @@ #define __PLAT_GPIO_CFG_H __FILE__ typedef unsigned int __bitwise__ s3c_gpio_pull_t; +typedef unsigned int __bitwise__ s5p_gpio_drvstr_t; /* forward declaration if gpio-core.h hasn't been included */ struct s3c_gpio_chip; @@ -42,6 +43,11 @@ struct s3c_gpio_chip; * layouts. Provide an point to vector control routine and provide any * per-bank configuration information that other systems such as the * external interrupt code will need. + * + * @sa s3c_gpio_cfgpin + * @sa s3c_gpio_getcfg + * @sa s3c_gpio_setpull + * @sa s3c_gpio_getpull */ struct s3c_gpio_cfg { unsigned int cfg_eint; @@ -69,14 +75,39 @@ struct s3c_gpio_cfg { /** * s3c_gpio_cfgpin() - Change the GPIO function of a pin. * @pin pin The pin number to configure. - * @pin to The configuration for the pin's function. + * @to to The configuration for the pin's function. * * Configure which function is actually connected to the external * pin, such as an gpio input, output or some form of special function * connected to an internal peripheral block. + * + * The @to parameter can be one of the generic S3C_GPIO_INPUT, S3C_GPIO_OUTPUT + * or S3C_GPIO_SFN() to indicate one of the possible values that the helper + * will then generate the correct bit mask and shift for the configuration. + * + * If a bank of GPIOs all needs to be set to special-function 2, then + * the following code will work: + * + * for (gpio = start; gpio < end; gpio++) + * s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2)); + * + * The @to parameter can also be a specific value already shifted to the + * correct position in the control register, although these are discouraged + * in newer kernels and are only being kept for compatibility. */ extern int s3c_gpio_cfgpin(unsigned int pin, unsigned int to); +/** + * s3c_gpio_getcfg - Read the current function for a GPIO pin + * @pin: The pin to read the configuration value for. + * + * Read the configuration state of the given @pin, returning a value that + * could be passed back to s3c_gpio_cfgpin(). + * + * @sa s3c_gpio_cfgpin + */ +extern unsigned s3c_gpio_getcfg(unsigned int pin); + /* Define values for the pull-{up,down} available for each gpio pin. * * These values control the state of the weak pull-{up,down} resistors @@ -96,6 +127,8 @@ extern int s3c_gpio_cfgpin(unsigned int pin, unsigned int to); * This function sets the state of the pull-{up,down} resistor for the * specified pin. It will return 0 if successfull, or a negative error * code if the pin cannot support the requested pull setting. + * + * @pull is one of S3C_GPIO_PULL_NONE, S3C_GPIO_PULL_DOWN or S3C_GPIO_PULL_UP. */ extern int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull); @@ -107,4 +140,33 @@ extern int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull); */ extern s3c_gpio_pull_t s3c_gpio_getpull(unsigned int pin); +/* Define values for the drvstr available for each gpio pin. + * + * These values control the value of the output signal driver strength, + * configurable on most pins on the S5C series. + */ +#define S5P_GPIO_DRVSTR_LV1 ((__force s5p_gpio_drvstr_t)0x00) +#define S5P_GPIO_DRVSTR_LV2 ((__force s5p_gpio_drvstr_t)0x01) +#define S5P_GPIO_DRVSTR_LV3 ((__force s5p_gpio_drvstr_t)0x10) +#define S5P_GPIO_DRVSTR_LV4 ((__force s5p_gpio_drvstr_t)0x11) + +/** + * s5c_gpio_get_drvstr() - get the driver streght value of a gpio pin + * @pin: The pin number to get the settings for + * + * Read the driver streght value for the specified pin. +*/ +extern s5p_gpio_drvstr_t s5p_gpio_get_drvstr(unsigned int pin); + +/** + * s3c_gpio_set_drvstr() - set the driver streght value of a gpio pin + * @pin: The pin number to configure the driver streght value + * @drvstr: The new value of the driver strength + * + * This function sets the driver strength value for the specified pin. + * It will return 0 if successfull, or a negative error code if the pin + * cannot support the requested setting. +*/ +extern int s5p_gpio_set_drvstr(unsigned int pin, s5p_gpio_drvstr_t drvstr); + #endif /* __PLAT_GPIO_CFG_H */ |