| Message ID | 1483357730-6800-9-git-send-email-andre.przywara@arm.com |
|---|---|
| State | Accepted |
| Commit | 8ed02bc2d969bcab140f33f235b512194ab17d47 |
| Delegated to: | Jagannadha Sutradharudu Teki |
| Headers | show |
diff --git a/arch/arm/cpu/armv8/cpu.c b/arch/arm/cpu/armv8/cpu.c index 5dcb5e2..28a27f7 100644 --- a/arch/arm/cpu/armv8/cpu.c +++ b/arch/arm/cpu/armv8/cpu.c @@ -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) { /*
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> --- arch/arm/cpu/armv8/cpu.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)