From 838c6d499b780c42fccbbdfecc0f5dcc471d0ef3 Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Tue, 18 May 2010 12:23:36 +0200 Subject: ARM: SAMSUNG: move driver strength gpio configuration helper to common dir Driver strength parameter can be changed not only on S5PC100 but also on S5PV210/S5PC110 platforms, so move the helper functions to the common plat-samsung directory. Signed-off-by: Marek Szyprowski Signed-off-by: Kyungmin Park Signed-off-by: Ben Dooks --- arch/arm/plat-samsung/Kconfig | 12 +++---- arch/arm/plat-samsung/gpio-config.c | 48 +++++++++++++++++++++++++++ arch/arm/plat-samsung/include/plat/gpio-cfg.h | 30 +++++++++++++++++ 3 files changed, 84 insertions(+), 6 deletions(-) (limited to 'arch/arm/plat-samsung') diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig index c91c21ac5fcb..711d5a4cce58 100644 --- a/arch/arm/plat-samsung/Kconfig +++ b/arch/arm/plat-samsung/Kconfig @@ -90,12 +90,6 @@ config S3C_GPIO_CFG_S3C64XX Internal configuration to enable S3C64XX style GPIO configuration functions. -config S5P_GPIO_CFG_S5PC1XX - bool - help - Internal configuration to enable S5PC1XX style GPIO configuration - functions. - config S3C_GPIO_PULL_UPDOWN bool help @@ -111,6 +105,12 @@ config S3C_GPIO_PULL_UP help Internal configuration to enable the correct GPIO pull helper +config S5P_GPIO_DRVSTR + bool + help + Internal configuration to get and set correct GPIO driver strength + helper + config SAMSUNG_GPIO_EXTRA int "Number of additional GPIO pins" default 0 diff --git a/arch/arm/plat-samsung/gpio-config.c b/arch/arm/plat-samsung/gpio-config.c index a76eef533392..57b68a50f45e 100644 --- a/arch/arm/plat-samsung/gpio-config.c +++ b/arch/arm/plat-samsung/gpio-config.c @@ -261,3 +261,51 @@ s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip, } #endif /* CONFIG_S3C_GPIO_PULL_UP */ +#ifdef CONFIG_S5P_GPIO_DRVSTR +s5p_gpio_drvstr_t s5p_gpio_get_drvstr(unsigned int pin) +{ + struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin); + unsigned int off; + void __iomem *reg; + int shift; + u32 drvstr; + + if (!chip) + return -EINVAL; + + off = chip->chip.base - pin; + shift = off * 2; + reg = chip->base + 0x0C; + + drvstr = __raw_readl(reg); + drvstr = 0xffff & (0x3 << shift); + drvstr = drvstr >> shift; + + return (__force s5p_gpio_drvstr_t)drvstr; +} +EXPORT_SYMBOL(s5p_gpio_get_drvstr); + +int s5p_gpio_set_drvstr(unsigned int pin, s5p_gpio_drvstr_t drvstr) +{ + struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin); + unsigned int off; + void __iomem *reg; + int shift; + u32 tmp; + + if (!chip) + return -EINVAL; + + off = chip->chip.base - pin; + shift = off * 2; + reg = chip->base + 0x0C; + + tmp = __raw_readl(reg); + tmp |= drvstr << shift; + + __raw_writel(tmp, reg); + + return 0; +} +EXPORT_SYMBOL(s5p_gpio_set_drvstr); +#endif /* CONFIG_S5P_GPIO_DRVSTR */ diff --git a/arch/arm/plat-samsung/include/plat/gpio-cfg.h b/arch/arm/plat-samsung/include/plat/gpio-cfg.h index 8d01e853df39..34efdd2b032c 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; @@ -118,4 +119,33 @@ 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 */ -- cgit v1.2.2