diff options
| author | Andres Salomon <dilinger@queued.net> | 2008-01-30 13:33:35 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:33:35 +0100 |
| commit | ade761496dcd0aea1c41da21d5a6ced4897f02e7 (patch) | |
| tree | 95c05a5e72eb02f1db5f2cb6cc7c38a769d12e0d /include/asm-x86 | |
| parent | 519efbc0b3b6004a3b98d66a446bce30852c8171 (diff) | |
x86: GEODE: update GPIO API to support setting multiple GPIOs at once
The existing Geode GPIO API only allows for updating one GPIO at once. There
are instances where users want to update multiple GPIOs at once. With the
current API, they are given two choices; either ignore the GPIO API:
outl(0xc000, gpio_base + GPIO_OUTPUT_VAL);
outl(0xc000, gpio_base + GPIO_OUTPUT_ENABLE);
Alternatively, call each GPIO update separately:
geode_gpio_set(14, GPIO_OUTPUT_VAL);
geode_gpio_set(15, GPIO_OUTPUT_VAL);
geode_gpio_set(14, GPIO_OUTPUT_ENABLE);
geode_gpio_set(15, GPIO_OUTPUT_ENABLE);
Neither are desirable. This patch changes the GPIO API to allow for setting
of multiple GPIOs at once; rather than being passed an integer, we pass
a bitmask and provide a translation function. The above code would now
look like this:
geode_gpio_set(geode_gpio(14)|geode_gpio(15), GPIO_OUTPUT_VAL);
geode_gpio_set(geode_gpio(14)|geode_gpio(15), GPIO_OUTPUT_ENABLE);
Since there are no upstream users of the GPIO API yet (afaik), best to
change this now. This also adds a bit of sanity checking; it is no
longer possible to use a GPIO above 28.
Note the semantics of geode_gpio_isset() have changed:
geode_gpio_isset(geode_gpio(3)|geode_gpio(4), ...)
will only return true iff both GPIOs are set.
Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/asm-x86')
| -rw-r--r-- | include/asm-x86/geode.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/include/asm-x86/geode.h b/include/asm-x86/geode.h index 771af336734..811fe14f70b 100644 --- a/include/asm-x86/geode.h +++ b/include/asm-x86/geode.h @@ -121,9 +121,15 @@ extern int geode_get_dev_base(unsigned int dev); #define GPIO_MAP_Z 0xE8 #define GPIO_MAP_W 0xEC -extern void geode_gpio_set(unsigned int, unsigned int); -extern void geode_gpio_clear(unsigned int, unsigned int); -extern int geode_gpio_isset(unsigned int, unsigned int); +static inline u32 geode_gpio(unsigned int nr) +{ + BUG_ON(nr > 28); + return 1 << nr; +} + +extern void geode_gpio_set(u32, unsigned int); +extern void geode_gpio_clear(u32, unsigned int); +extern int geode_gpio_isset(u32, unsigned int); extern void geode_gpio_setup_event(unsigned int, int, int); extern void geode_gpio_set_irq(unsigned int, unsigned int); |