Hello Renaud,
On 01.03.23 17:59, Renaud Barbier wrote:
> 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 <renaud.barbier@xxxxxxxxxx>
> ---
> 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
I think we need a CFLAGS_pbl.o := -march=armv7-a here, otherwise
this would break builds of non-ARMv7 platforms.
See arm_architected_timer.o in drivers/clocksource. Also, perhaps
you should rename the file to arm_architected_timer.c as well?
> 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);
--
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