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[ARM] S3C: Add GPIO chip tracking

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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>
This commit is contained in:
Ben Dooks 2008-10-31 16:14:32 +00:00
parent 7db6c82a37
commit 8a53bdb907
4 changed files with 50 additions and 1 deletions
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6
arch/arm/plat-s3c/Kconfig
View file

@ -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

21
arch/arm/plat-s3c/gpio.c
View file

@ -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);
}

23
arch/arm/plat-s3c/include/plat/gpio-core.h
View file

@ -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

1
arch/arm/plat-s3c64xx/Kconfig
View file

@ -14,6 +14,7 @@ config PLAT_S3C64XX
default y
select NO_IOPORT
select ARCH_REQUIRE_GPIOLIB
select S3C_GPIO_TRACK
help
Base platform code for any Samsung S3C64XX device