Re: Subject: [PATCH 1/1] ARM:lib32: add architected timer

[Sascha Hauer <sha@pengutronix.de>]

On Tue, Mar 07, 2023 at 04:17:08PM +0000, Renaud Barbier wrote:
> 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@ametek.com>
> ---
>  arch/arm/lib32/Makefile                |  2 ++
>  arch/arm/lib32/arm_architected_timer.c | 17 +++++++++++++++++
>  include/clock.h                        |  2 ++
>  3 files changed, 21 insertions(+)
>  create mode 100644 arch/arm/lib32/arm_architected_timer.c

Applied, thanks

Sascha

> 
> diff --git a/arch/arm/lib32/Makefile b/arch/arm/lib32/Makefile
> index 82507fffc0..d54fb7644c 100644
> --- a/arch/arm/lib32/Makefile
> +++ b/arch/arm/lib32/Makefile
> @@ -31,6 +31,8 @@ extra-y += barebox.lds
>  pbl-y	+= lib1funcs.o
>  pbl-y	+= ashldi3.o
>  pbl-y	+= div0.o
> +pbl-$(CONFIG_CPU_32v7)	+= arm_architected_timer.o
> +CFLAGS_arm_architected_timer.o := -march=armv7-a
>  
>  obj-pbl-y	+= setjmp.o
>  
> diff --git a/arch/arm/lib32/arm_architected_timer.c b/arch/arm/lib32/arm_architected_timer.c
> new file mode 100644
> index 0000000000..54eca13f8b
> --- /dev/null
> +++ b/arch/arm/lib32/arm_architected_timer.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 = DIV_ROUND_DOWN_ULL((us * cntfrq), 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
> 
> 

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