Subject: [PATCH 1/3] ARM:lib32: add architected timer In preparation for the introduction of the LS1021A support, add a specific timer support based on the LS1046A support so that delays can be used in the PBL.
Signed-off-by: Renaud Barbier <[email protected]> --- arch/arm/lib32/Makefile | 1 + arch/arm/lib32/pbl.c | 17 +++++++++++++++++ include/clock.h | 2 ++ 3 files changed, 20 insertions(+) create mode 100644 arch/arm/lib32/pbl.c diff --git a/arch/arm/lib32/Makefile b/arch/arm/lib32/Makefile index 82507fffc0..1be8d70c45 100644 --- a/arch/arm/lib32/Makefile +++ b/arch/arm/lib32/Makefile @@ -31,6 +31,7 @@ extra-y += barebox.lds pbl-y += lib1funcs.o pbl-y += ashldi3.o pbl-y += div0.o +pbl-y += pbl.o obj-pbl-y += setjmp.o diff --git a/arch/arm/lib32/pbl.c b/arch/arm/lib32/pbl.c new file mode 100644 index 0000000000..83b49656cb --- /dev/null +++ b/arch/arm/lib32/pbl.c @@ -0,0 +1,17 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <asm/system.h> +#include <clock.h> +#include <common.h> + +/* Unlike the ARMv8, the timer is not generic to ARM32 */ +void arm_architected_timer_udelay(unsigned long us) +{ + unsigned long long ticks, cntfrq = get_cntfrq(); + unsigned long long start = get_cntpct(); + + ticks = us * cntfrq + 999999; + do_div(ticks, 1000000); + + while ((long)(start + ticks - get_cntpct()) > 0); +} diff --git a/include/clock.h b/include/clock.h index e6197e7eb0..8e07c35d37 100644 --- a/include/clock.h +++ b/include/clock.h @@ -35,6 +35,8 @@ uint32_t clocksource_hz2mult(uint32_t hz, uint32_t shift_constant); int is_timeout(uint64_t start_ns, uint64_t time_offset_ns); int is_timeout_non_interruptible(uint64_t start_ns, uint64_t time_offset_ns); +void arm_architected_timer_udelay(unsigned long us); + void ndelay(unsigned long nsecs); void udelay(unsigned long usecs); void mdelay(unsigned long msecs); -- 2.27.0
