diff options
author | Ben Dooks <ben-linux@fluff.org> | 2008-10-31 17:14:32 +0100 |
---|---|---|
committer | Ben Dooks <ben-linux@fluff.org> | 2008-12-16 00:33:42 +0100 |
commit | 8a53bdb907cb924ed30f79bcfe7f4f15ff7de15e (patch) | |
tree | e2bca4f6a4988f4eeb79ff18ac782b2383d1cf92 /arch/arm/plat-s3c | |
parent | [ARM] S3C: Move common GPIO code from plat-s3c24xx (diff) | |
download | linux-8a53bdb907cb924ed30f79bcfe7f4f15ff7de15e.tar.xz linux-8a53bdb907cb924ed30f79bcfe7f4f15ff7de15e.zip |
[ARM] S3C: Add GPIO chip tracking
The gpiolib driver keeps its chip array to itself
and having a separate array for s3c-only gpios stops
any non-s3c gpio being used in one of the s3c specific
configuration calls.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/plat-s3c')
-rw-r--r-- | arch/arm/plat-s3c/Kconfig | 6 | ||||
-rw-r--r-- | arch/arm/plat-s3c/gpio.c | 21 | ||||
-rw-r--r-- | arch/arm/plat-s3c/include/plat/gpio-core.h | 23 |
3 files changed, 49 insertions, 1 deletions
diff --git a/arch/arm/plat-s3c/Kconfig b/arch/arm/plat-s3c/Kconfig index d7767e0305d0..77fc38f51874 100644 --- a/arch/arm/plat-s3c/Kconfig +++ b/arch/arm/plat-s3c/Kconfig @@ -114,6 +114,12 @@ config S3C_GPIO_SPACE one bank to another to be caught, at the expense of using a little more memory. +config S3C_GPIO_TRACK + bool + help + Internal configuration option to enable the s3c specific gpio + chip tracking if the platform requires it. + # device definitions to compile in config S3C_DEV_HSMMC diff --git a/arch/arm/plat-s3c/gpio.c b/arch/arm/plat-s3c/gpio.c index f035d4550c43..d71dd6d9ce5c 100644 --- a/arch/arm/plat-s3c/gpio.c +++ b/arch/arm/plat-s3c/gpio.c @@ -18,6 +18,22 @@ #include <plat/gpio-core.h> +#ifdef CONFIG_S3C_GPIO_TRACK +struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END]; + +static __init void s3c_gpiolib_track(struct s3c_gpio_chip *chip) +{ + unsigned int gpn; + int i; + + gpn = chip->chip.base; + for (i = 0; i < chip->chip.ngpio; i++, gpn++) { + BUG_ON(gpn > ARRAY_SIZE(s3c_gpios)); + s3c_gpios[gpn] = chip; + } +} +#endif /* CONFIG_S3C_GPIO_TRACK */ + /* Default routines for controlling GPIO, based on the original S3C24XX * GPIO functions which deal with the case where each gpio bank of the * chip is as following: @@ -109,6 +125,7 @@ static int s3c_gpiolib_get(struct gpio_chip *chip, unsigned offset) __init void s3c_gpiolib_add(struct s3c_gpio_chip *chip) { struct gpio_chip *gc = &chip->chip; + int ret; BUG_ON(!chip->base); BUG_ON(!gc->label); @@ -124,5 +141,7 @@ __init void s3c_gpiolib_add(struct s3c_gpio_chip *chip) gc->get = s3c_gpiolib_get; /* gpiochip_add() prints own failure message on error. */ - gpiochip_add(gc); + ret = gpiochip_add(gc); + if (ret >= 0) + s3c_gpiolib_track(chip); } diff --git a/arch/arm/plat-s3c/include/plat/gpio-core.h b/arch/arm/plat-s3c/include/plat/gpio-core.h index 3cb9105c4811..ad68b32a7f9d 100644 --- a/arch/arm/plat-s3c/include/plat/gpio-core.h +++ b/arch/arm/plat-s3c/include/plat/gpio-core.h @@ -47,3 +47,26 @@ static inline struct s3c_gpio_chip *to_s3c_gpio(struct gpio_chip *gpc) * other parts of the system. */ extern void s3c_gpiolib_add(struct s3c_gpio_chip *chip); + + +/* CONFIG_S3C_GPIO_TRACK enables the tracking of the s3c specific gpios + * for use with the configuration calls, and other parts of the s3c gpiolib + * support code. + * + * Not all s3c support code will need this, as some configurations of cpu + * may only support one or two different configuration options and have an + * easy gpio to s3c_gpio_chip mapping function. If this is the case, then + * the machine support file should provide its own s3c_gpiolib_getchip() + * and any other necessary functions. + */ + +#ifdef CONFIG_S3C_GPIO_TRACK +extern struct s3c_gpio_chip *s3c_gpios[S3C_GPIO_END]; + +static inline struct s3c_gpio_chip *s3c_gpiolib_getchip(unsigned int chip) +{ + return s3c_gpios[chip]; +} +#else +static inline void s3c_gpiolib_track(struct s3c_gpio_chip *chip) { } +#endif |