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author | Sascha Hauer <s.hauer@pengutronix.de> | 2019-02-25 14:02:02 +0100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2019-03-13 10:27:42 +0100 |
commit | 06a3cd1d1c8b0c59ca4313dfe02915f951c8b4c6 (patch) | |
tree | 5c2e3586bba81e2575695abbd2509319c2d0ed5b | |
parent | ec09152b909d88a1bd26ba125d87d74a5ca424d8 (diff) | |
download | barebox-06a3cd1d1c8b0c59ca4313dfe02915f951c8b4c6.tar.gz barebox-06a3cd1d1c8b0c59ca4313dfe02915f951c8b4c6.tar.xz |
ARM: Add arm64 pbl udelay
PBL often needs a way to udelay execution. Since we have a generic timer
in ARMv8 we can implement a generic udelay.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
-rw-r--r-- | arch/arm/lib64/Makefile | 2 | ||||
-rw-r--r-- | arch/arm/lib64/pbl.c | 17 |
2 files changed, 18 insertions, 1 deletions
diff --git a/arch/arm/lib64/Makefile b/arch/arm/lib64/Makefile index 4c0019fabe..5068431342 100644 --- a/arch/arm/lib64/Makefile +++ b/arch/arm/lib64/Makefile @@ -6,4 +6,4 @@ obj-$(CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS) += memset.o string.o extra-y += barebox.lds obj-pbl-y += runtime-offset.o -pbl-y += div0.o +pbl-y += div0.o pbl.o diff --git a/arch/arm/lib64/pbl.c b/arch/arm/lib64/pbl.c new file mode 100644 index 0000000000..0cef08e4d2 --- /dev/null +++ b/arch/arm/lib64/pbl.c @@ -0,0 +1,17 @@ +#include <asm/system.h> +#include <clock.h> +#include <common.h> + +void udelay(unsigned long us) +{ + unsigned long cntfrq = get_cntfrq(); + unsigned long ticks = (us * cntfrq) / 1000000; + unsigned long start = get_cntpct(); + + while ((long)(start + ticks - get_cntpct()) > 0); +} + +void mdelay(unsigned long ms) +{ + udelay(ms * 1000); +} |