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dm: timer: Support 64-bit counter

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There are timers with a 64-bit counter value but current timer
uclass driver assumes a 32-bit one. Modify timer_get_count()
to ask timer driver to always return a 64-bit counter value,
and provide an inline helper function timer_conv_64() to handle
the 32-bit/64-bit conversion automatically.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2015-11-24 13:31:17 -07:00 • committed by Simon Glass
parent f838f12452
commit 9ca07ebbac
5 changed files with 32 additions and 12 deletions
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14
include/timer.h
View file

@ -7,6 +7,14 @@
#ifndef _TIMER_H_
#define _TIMER_H_
/*
* timer_conv_64 - convert 32-bit counter value to 64-bit
*
* @count: 32-bit counter value
* @return: 64-bit counter value
*/
u64 timer_conv_64(u32 count);
/*
* Get the current timer count
*
@ -14,7 +22,7 @@
* @count: pointer that returns the current timer count
* @return: 0 if OK, -ve on error
*/
int timer_get_count(struct udevice *dev, unsigned long *count);
int timer_get_count(struct udevice *dev, u64 *count);
/*
* Get the timer input clock frequency
@ -35,10 +43,10 @@ struct timer_ops {
* Get the current timer count
*
* @dev: The timer device
* @count: pointer that returns the current timer count
* @count: pointer that returns the current 64-bit timer count
* @return: 0 if OK, -ve on error
*/
int (*get_count)(struct udevice *dev, unsigned long *count);
int (*get_count)(struct udevice *dev, u64 *count);
};
/*