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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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15
drivers/timer/timer-uclass.c
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@ -13,14 +13,14 @@ DECLARE_GLOBAL_DATA_PTR;
/*
* Implement a timer uclass to work with lib/time.c. The timer is usually
* a 32 bits free-running up counter. The get_rate() method is used to get
* a 32/64 bits free-running up counter. The get_rate() method is used to get
* the input clock frequency of the timer. The get_count() method is used
* to get the current 32 bits count value. If the hardware is counting down,
* to get the current 64 bits count value. If the hardware is counting down,
* the value should be inversed inside the method. There may be no real
* tick, and no timer interrupt.
*/
int timer_get_count(struct udevice *dev, unsigned long *count)
int timer_get_count(struct udevice *dev, u64 *count)
{
const struct timer_ops *ops = device_get_ops(dev);
@ -47,6 +47,15 @@ static int timer_pre_probe(struct udevice *dev)
return 0;
}
u64 timer_conv_64(u32 count)
{
/* increment tbh if tbl has rolled over */
if (count < gd->timebase_l)
gd->timebase_h++;
gd->timebase_l = count;
return ((u64)gd->timebase_h << 32) | gd->timebase_l;
}
UCLASS_DRIVER(timer) = {
.id = UCLASS_TIMER,
.name = "timer",