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feat(sbsa): helper api for refreshing watchdog timer

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This patch adds a helper API to explicitly refresh SBSA secure watchdog
timer. Please refer section A.3 of the following spec:

https://developer.arm.com/documentation/den0029/latest/

Change-Id: I2d0943792aea0092bee1e51d74b908348587e66b
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
This commit is contained in:
Madhukar Pappireddy 2023-03-22 15:27:22 -05:00
parent c194aa0c6c
commit e8166d3e59
3 changed files with 18 additions and 3 deletions
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3
changelog.yaml
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@ -877,6 +877,9 @@ subsections:
deprecated:
- drivers/tzc380
- title: SBSA
scope: sbsa
- title: Marvell
scope: marvell-drivers

8
drivers/arm/sbsa/sbsa.c
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2019, ARM Limited. All rights reserved.
* Copyright (c) 2019-2023, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -40,3 +40,9 @@ void sbsa_wdog_stop(uintptr_t base)
{
mmio_write_32(base + SBSA_WDOG_WCS_OFFSET, (0x0));
}
/* Refresh the secure watchdog timer explicitly */
void sbsa_wdog_refresh(uintptr_t refresh_base)
{
mmio_write_32(refresh_base + SBSA_WDOG_WRR_OFFSET, SBSA_WDOG_WRR_REFRESH);
}

10
include/drivers/arm/sbsa.h
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2019, ARM Limited. All rights reserved.
* Copyright (c) 2019-2023, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -9,7 +9,12 @@
#include <stdint.h>
/* Register Offsets */
/* SBSA Secure Watchdog Register Offsets */
/* Refresh frame */
#define SBSA_WDOG_WRR_OFFSET UL(0x000)
#define SBSA_WDOG_WRR_REFRESH UL(0x1)
/* Control and status frame */
#define SBSA_WDOG_WCS_OFFSET UL(0x000)
#define SBSA_WDOG_WOR_LOW_OFFSET UL(0x008)
#define SBSA_WDOG_WOR_HIGH_OFFSET UL(0x00C)
@ -20,5 +25,6 @@
void sbsa_wdog_start(uintptr_t base, uint64_t ms);
void sbsa_wdog_stop(uintptr_t base);
void sbsa_wdog_refresh(uintptr_t refresh_base);
#endif /* SBSA_H */