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armv8: add simple sdelay implementation

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The sunxi DRAM setup code needs an sdelay() implementation, which
wasn't defined for armv8 so far.
Shamelessly copy the armv7 version and adjust it to work in AArch64.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Andre Przywara 2017-01-02 11:48:32 +00:00 • committed by Jagan Teki
parent 11e1479b9e
commit 8ed02bc2d9
1 changed files with 14 additions and 0 deletions
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14
arch/arm/cpu/armv8/cpu.c
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@ -17,6 +17,20 @@
#include <asm/secure.h>
#include <linux/compiler.h>
/*
* sdelay() - simple spin loop.
*
* Will delay execution by roughly (@loops * 2) cycles.
* This is necessary to be used before timers are accessible.
*
* A value of "0" will results in 2^64 loops.
*/
void sdelay(unsigned long loops)
{
__asm__ volatile ("1:\n" "subs %0, %0, #1\n"
"b.ne 1b" : "=r" (loops) : "0"(loops) : "cc");
}
int cleanup_before_linux(void)
{
/*