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arm: imx-common: introduce back usec2ticks

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This commit "2bb014820c49a63902103bac710bc86b5772e843"
do some clean up to use the code in lib/time.c.
But usec2ticks is still being used by security related job ring code.
Bring back the function to avoid build break when CONFIG_FSL_CAAM
is defined.
The computation logic has been changed, using 64-bit variable
to ease the process, making it work on older (MX5) platforms.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Gary Bisson <gary.bisson@boundarydevices.com>
This commit is contained in:
Peng Fan 2016-08-25 19:03:17 +02:00 committed by Stefano Babic
parent 6e1f4d2652
commit 436baaa2f5
1 changed files with 16 additions and 0 deletions
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16
arch/arm/imx-common/timer.c
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@ -120,3 +120,19 @@ ulong get_tbclk(void)
{
return gpt_get_clk();
}
/*
* This function is intended for SHORT delays only.
* It will overflow at around 10 seconds @ 400MHz,
* or 20 seconds @ 200MHz.
*/
unsigned long usec2ticks(unsigned long _usec)
{
unsigned long long usec = _usec;
usec *= get_tbclk();
usec += 999999;
do_div(usec, 1000000);
return usec;
}