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aarch64/raspberrypi: Add Watchdog Timer driver

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This commit is contained in:
Ning Yang
2024-08-07 21:53:36 +08:00
committed by Chris Johns
parent a51b7d4b57
commit 447f767abc
5 changed files with 193 additions and 1 deletions
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5
bsps/aarch64/raspberrypi/include/bsp/raspberrypi.h
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@@ -93,7 +93,7 @@
/** @} */
/**
* @name Power Management and Watchdog Registers
* @name Power Management and Watchdog Registers
*
* @{
*/
@@ -124,10 +124,12 @@
#define BCM2711_PM_RSTC_DRCFG 0x00000003
#define BCM2711_PM_RSTC_WRCFG 0x00000030
#define BCM2711_PM_RSTC_WRCFG_FULL 0x00000020
#define BCM2711_PM_RSTC_WRCFG_CLR 0xffffffcf
#define BCM2711_PM_RSTC_SRCFG 0x00000300
#define BCM2711_PM_RSTC_QRCFG 0x00003000
#define BCM2711_PM_RSTC_FRCFG 0x00030000
#define BCM2711_PM_RSTC_HRCFG 0x00300000
#define BCM2711_PM_RSTC_RESET 0x00000102
#define BCM2711_PM_RSTS (BCM2711_PM_BASE + 0x20)
#define BCM2711_PM_RSTS_HADDRQ 0x00000001
@@ -142,6 +144,7 @@
#define BCM2711_PM_RSTS_HADPOR 0x00001000
#define BCM2711_PM_WDOG (BCM2711_PM_BASE + 0x24)
#define BCM2711_PM_WDOG_MASK 0x000fffff
/** @} */

97
bsps/aarch64/raspberrypi/include/bsp/watchdog.h Normal file
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@@ -0,0 +1,97 @@
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsAArch64RaspberryPi
*
* @brief API of the Watchdog driver for the raspberrypi4 bsp in RTEMS.
*/
/*
* Copyright (C) 2024 Ning Yang
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LIBBSP_AARCH64_RASPBERRYPI_BSP_RPI_WATCHDOG_H
#define LIBBSP_AARCH64_RASPBERRYPI_BSP_RPI_WATCHDOG_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* @note a brief example of expected usage.
*
* void raspberrypi_watchdog_example()
* {
* raspberrypi_watchdog_init();
* raspberrypi_watchdog_start(15000);
*
* raspberrypi_watchdog_reload();
* ...
* raspberrypi_watchdog_reload();
*
* raspberrypi_watchdog_stop();
* }
*
*/
/**
* @brief Initialize BSP watchdog routines.
*/
void raspberrypi_watchdog_init(void);
/**
* @brief Turn on the watchdog / begin the counter at the desired value.
*
* @param timeout Watchdog timeout value in ms.
* The watchdog device has 20 bits of timeout, so it only
* supports a maximum of 15999 ms for its timeout.
* This value should be between 0 and 15999.
*/
void raspberrypi_watchdog_start(uint32_t timeout_ms);
/**
* @brief Turn off the watchdog.
*/
void raspberrypi_watchdog_stop(void);
/**
* @brief Reload watchdog.
*/
void raspberrypi_watchdog_reload(void);
/**
* @brief Get the remaining time of the watchdog.
* The return value is still valid when the watchdog has been stopped.
*
* @retval Watchdog remaining time in ms.
*/
uint32_t raspberrypi_watchdog_get_remaining_time(void);
#ifdef __cplusplus
}
#endif
#endif

73
bsps/aarch64/raspberrypi/start/watchdog.c Normal file
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@@ -0,0 +1,73 @@
/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSBSPsAArch64RaspberryPi
*
* @brief Watchdog Driver
*/
/*
* Copyright (C) 2024 Ning Yang
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <bsp/raspberrypi.h>
#include <bsp/watchdog.h>
#define PM_WDOG BCM2835_REG(BCM2711_PM_WDOG)
#define PM_RSTC BCM2835_REG(BCM2711_PM_RSTC)
uint32_t raspberrypi_watchdog_timeout;
void raspberrypi_watchdog_init()
{
raspberrypi_watchdog_timeout = 0;
}
void raspberrypi_watchdog_start(uint32_t timeout_ms)
{
raspberrypi_watchdog_timeout = timeout_ms;
PM_WDOG = BCM2711_PM_PASSWD_MAGIC |
((timeout_ms * 65536 / 1000) & BCM2711_PM_WDOG_MASK);
PM_RSTC &= BCM2711_PM_RSTC_WRCFG_CLR;
PM_RSTC = (BCM2711_PM_PASSWD_MAGIC | BCM2711_PM_RSTC_WRCFG_FULL);
}
void raspberrypi_watchdog_stop()
{
PM_RSTC = BCM2711_PM_PASSWD_MAGIC | BCM2711_PM_RSTC_RESET;
}
void raspberrypi_watchdog_reload()
{
raspberrypi_watchdog_start(raspberrypi_watchdog_timeout);
}
uint32_t raspberrypi_watchdog_get_remaining_time()
{
return (PM_WDOG & BCM2711_PM_WDOG_MASK)*1000/65536;
}

2
spec/build/bsps/aarch64/raspberrypi/bspraspberrypi4.yml
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@@ -57,6 +57,8 @@ links:
uid: objgpio
- role: build-dependency
uid: objspi
- role: build-dependency
uid: objwatchdog
source:
- bsps/aarch64/raspberrypi/console/console.c
- bsps/aarch64/raspberrypi/start/bspstart.c

17
spec/build/bsps/aarch64/raspberrypi/objwatchdog.yml Normal file
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@@ -0,0 +1,17 @@
SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
build-type: objects
cflags: []
copyrights:
- Copyright (C) 2024 Ning Yang
cppflags: []
cxxflags: []
enabled-by: true
includes: []
install:
- destination: ${BSP_INCLUDEDIR}/bsp
source:
- bsps/aarch64/raspberrypi/include/bsp/watchdog.h
links: []
source:
- bsps/aarch64/raspberrypi/start/watchdog.c
type: build