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soc: arm: atmel_sam: Sys_arch_reboot using RSTC

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The previous implementation of the sys_arch_reboot function
for the Atmel SAM series was using NVIC_SystemReset.
This caused a reboot time of around 20 seconds on a SAM4SA16CA,
which is now reduced by directly writing to the
reset controller control register (RSTC_CR).

Signed-off-by: Jaro Van Landschoot <jaro.vanlandschoot@basalte.be>
Co-authored-by: Gerson Fernando Budke <nandojve@gmail.com>
This commit is contained in:
Jaro Van Landschoot 2023-12-07 14:22:51 +01:00 • committed by Fabio Baltieri
commit be6cf5c268
2 changed files with 38 additions and 0 deletions
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1
soc/arm/atmel_sam/common/CMakeLists.txt
View file

@ -4,6 +4,7 @@ zephyr_include_directories(.)
zephyr_library_sources_ifndef(CONFIG_SOC_SERIES_SAM4L soc_pmc.c)
zephyr_library_sources_ifndef(CONFIG_SOC_SERIES_SAM4L soc_gpio.c)
zephyr_library_sources_ifndef(CONFIG_SOC_SERIES_SAM4L soc_supc.c)
zephyr_library_sources_ifndef(CONFIG_SOC_SERIES_SAM4L soc_power.c)
zephyr_library_sources_ifndef(CONFIG_SOC_SERIES_SAM4L soc_poweroff.c)
zephyr_library_sources_ifdef(CONFIG_SOC_SERIES_SAM4L soc_sam4l_pm.c)

37
soc/arm/atmel_sam/common/soc_power.c Normal file
View file

@ -0,0 +1,37 @@
/*
* Copyright (c) 2023 Basalte bv
*
* SPDX-License-Identifier: Apache-2.0
*/
#define SAM_DT_RSTC_DRIVER DT_INST(0, atmel_sam_rstc)
#include <zephyr/kernel.h>
#if defined(CONFIG_REBOOT)
#include <zephyr/sys/reboot.h>
#endif
#if defined(CONFIG_REBOOT)
#if DT_NODE_HAS_STATUS(SAM_DT_RSTC_DRIVER, okay)
void sys_arch_reboot(int type)
{
Rstc *regs = (Rstc *)DT_REG_ADDR(SAM_DT_RSTC_DRIVER);
switch (type) {
case SYS_REBOOT_COLD:
regs->RSTC_CR = RSTC_CR_KEY_PASSWD
| RSTC_CR_PROCRST
#if defined(CONFIG_SOC_SERIES_SAM3X) || defined(CONFIG_SOC_SERIES_SAM4S) || \
defined(CONFIG_SOC_SERIES_SAM4E)
| RSTC_CR_PERRST
#endif /* CONFIG_SOC_SERIES_SAM3X || CONFIG_SOC_SERIES_SAM4S || CONFIG_SOC_SERIES_SAM4E */
;
break;
default:
break;
}
}
#endif /* DT_NODE_HAS_STATUS */
#endif /* CONFIG_REBOOT */