diff options
Diffstat (limited to 'drivers/gpio/gpio-samsung.c')
| -rw-r--r-- | drivers/gpio/gpio-samsung.c | 124 |
1 files changed, 84 insertions, 40 deletions
diff --git a/drivers/gpio/gpio-samsung.c b/drivers/gpio/gpio-samsung.c index ba126cc04073..a006f0db15af 100644 --- a/drivers/gpio/gpio-samsung.c +++ b/drivers/gpio/gpio-samsung.c @@ -938,6 +938,67 @@ static void __init samsung_gpiolib_add(struct samsung_gpio_chip *chip) s3c_gpiolib_track(chip); } +#if defined(CONFIG_PLAT_S3C24XX) && defined(CONFIG_OF) +static int s3c24xx_gpio_xlate(struct gpio_chip *gc, + const struct of_phandle_args *gpiospec, u32 *flags) +{ + unsigned int pin; + + if (WARN_ON(gc->of_gpio_n_cells < 3)) + return -EINVAL; + + if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells)) + return -EINVAL; + + if (gpiospec->args[0] > gc->ngpio) + return -EINVAL; + + pin = gc->base + gpiospec->args[0]; + + if (s3c_gpio_cfgpin(pin, S3C_GPIO_SFN(gpiospec->args[1]))) + pr_warn("gpio_xlate: failed to set pin function\n"); + if (s3c_gpio_setpull(pin, gpiospec->args[2] & 0xffff)) + pr_warn("gpio_xlate: failed to set pin pull up/down\n"); + + if (flags) + *flags = gpiospec->args[2] >> 16; + + return gpiospec->args[0]; +} + +static const struct of_device_id s3c24xx_gpio_dt_match[] __initdata = { + { .compatible = "samsung,s3c24xx-gpio", }, + {} +}; + +static __init void s3c24xx_gpiolib_attach_ofnode(struct samsung_gpio_chip *chip, + u64 base, u64 offset) +{ + struct gpio_chip *gc = &chip->chip; + u64 address; + + if (!of_have_populated_dt()) + return; + + address = chip->base ? base + ((u32)chip->base & 0xfff) : base + offset; + gc->of_node = of_find_matching_node_by_address(NULL, + s3c24xx_gpio_dt_match, address); + if (!gc->of_node) { + pr_info("gpio: device tree node not found for gpio controller" + " with base address %08llx\n", address); + return; + } + gc->of_gpio_n_cells = 3; + gc->of_xlate = s3c24xx_gpio_xlate; +} +#else +static __init void s3c24xx_gpiolib_attach_ofnode(struct samsung_gpio_chip *chip, + u64 base, u64 offset) +{ + return; +} +#endif /* defined(CONFIG_PLAT_S3C24XX) && defined(CONFIG_OF) */ + static void __init s3c24xx_gpiolib_add_chips(struct samsung_gpio_chip *chip, int nr_chips, void __iomem *base) { @@ -962,6 +1023,8 @@ static void __init s3c24xx_gpiolib_add_chips(struct samsung_gpio_chip *chip, gc->direction_output = samsung_gpiolib_2bit_output; samsung_gpiolib_add(chip); + + s3c24xx_gpiolib_attach_ofnode(chip, S3C24XX_PA_GPIO, i * 0x10); } } @@ -2734,6 +2797,27 @@ static __init void exynos4_gpiolib_init(void) int group = 0; void __iomem *gpx_base; +#ifdef CONFIG_PINCTRL_SAMSUNG + /* + * This gpio driver includes support for device tree support and + * there are platforms using it. In order to maintain + * compatibility with those platforms, and to allow non-dt + * Exynos4210 platforms to use this gpiolib support, a check + * is added to find out if there is a active pin-controller + * driver support available. If it is available, this gpiolib + * support is ignored and the gpiolib support available in + * pin-controller driver is used. This is a temporary check and + * will go away when all of the Exynos4210 platforms have + * switched to using device tree and the pin-ctrl driver. + */ + struct device_node *pctrl_np; + const char *pctrl_compat = "samsung,pinctrl-exynos4210"; + pctrl_np = of_find_compatible_node(NULL, NULL, pctrl_compat); + if (pctrl_np) + if (of_device_is_available(pctrl_np)) + return; +#endif + /* gpio part1 */ gpio_base1 = ioremap(EXYNOS4_PA_GPIO1, SZ_4K); if (gpio_base1 == NULL) { @@ -3131,46 +3215,6 @@ samsung_gpio_pull_t s3c_gpio_getpull(unsigned int pin) } EXPORT_SYMBOL(s3c_gpio_getpull); -/* gpiolib wrappers until these are totally eliminated */ - -void s3c2410_gpio_pullup(unsigned int pin, unsigned int to) -{ - int ret; - - WARN_ON(to); /* should be none of these left */ - - if (!to) { - /* if pull is enabled, try first with up, and if that - * fails, try using down */ - - ret = s3c_gpio_setpull(pin, S3C_GPIO_PULL_UP); - if (ret) - s3c_gpio_setpull(pin, S3C_GPIO_PULL_DOWN); - } else { - s3c_gpio_setpull(pin, S3C_GPIO_PULL_NONE); - } -} -EXPORT_SYMBOL(s3c2410_gpio_pullup); - -void s3c2410_gpio_setpin(unsigned int pin, unsigned int to) -{ - /* do this via gpiolib until all users removed */ - - gpio_request(pin, "temporary"); - gpio_set_value(pin, to); - gpio_free(pin); -} -EXPORT_SYMBOL(s3c2410_gpio_setpin); - -unsigned int s3c2410_gpio_getpin(unsigned int pin) -{ - struct samsung_gpio_chip *chip = samsung_gpiolib_getchip(pin); - unsigned long offs = pin - chip->chip.base; - - return __raw_readl(chip->base + 0x04) & (1 << offs); -} -EXPORT_SYMBOL(s3c2410_gpio_getpin); - #ifdef CONFIG_S5P_GPIO_DRVSTR s5p_gpio_drvstr_t s5p_gpio_get_drvstr(unsigned int pin) { |