[U-Boot] armv8: define get_ticks() for the ARMv8 Generic Timer

[Tom Rini]

On Thu, Nov 03, 2016 at 12:56:25AM +0000, Andre Przywara wrote:

> For 64-bit ARM systems we provide just a timer_read_counter()
> implementation and rely on the generic non-uclass get_ticks() function
> in lib/time.c to call the former.
> However this function is actually not 64-bit safe, as it assumes a
> "long" to be 32-bit. Beside the fact that the resulting uint64_t
> isn't bigger than "long" on 64-bit architectures and thus combining two
> counters makes no sense, we get all kind of weird results when we try
> to OR in the high value shifted by _32_ bits.
> So let's avoid that function at all and provide a straight forward
> get_ticks() implementation for ARMv8, which also is in line with ARMv7.
> 
> This fixes occasional immediate time-out expiration issues I see on the
> Pine64 board. The root cause of this needs to be investigated, but this
> fix looks like the right thing anyway.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>

Applied to u-boot/master, thanks!

-- 
Tom
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