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armv8: Make COUNTER_FREQUENCY optional

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Some platforms have the means to determine the counter frequency at
runtime, so give them an opportunity to do so.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Thierry Reding 2015-08-20 11:42:18 +02:00 committed by Tom Warren
parent b9f269f60f
commit 70bcb43e7d
1 changed files with 2 additions and 0 deletions
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2
arch/arm/cpu/armv8/start.S
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@ -54,8 +54,10 @@ reset:
orr x0, x0, #0xf /* SCR_EL3.NS|IRQ|FIQ|EA */
msr scr_el3, x0
msr cptr_el3, xzr /* Enable FP/SIMD */
#ifdef COUNTER_FREQUENCY
ldr x0, =COUNTER_FREQUENCY
msr cntfrq_el0, x0 /* Initialize CNTFRQ */
#endif
b 0f
2: msr vbar_el2, x0
mov x0, #0x33ff