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f967a69748
This adds the necessary code and function to allow a board to determine the reason for a reset. This is useful in NXboot, for example. Signed-off-by: Tim Hardisty <timh@jti.uk.com>
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/****************************************************************************
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* arch/arm/src/sama5/sam_systemreset.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <arch/sama5/chip.h>
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#include "arm_internal.h"
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#include "hardware/sam_rstc.h"
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#include "sam_systemreset.h"
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#ifdef CONFIG_SAMA5_SYSTEMRESET
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sam_get_reset_cause
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*
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* Description:
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* Get cause of the last CPU reset. This is done by reading reset status
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* registger.
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*
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* Returned Value:
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* CPU reset cause in form of macros defined in sam_systemreset.h. This is
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* to avoid passing boardctl dependent structure to architecture layer.
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* Board level specific code should include sam_systemreset.h and set
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* boardctl result according to that. -1 is returned in case of invalid
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* value in status register.
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*
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****************************************************************************/
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#ifdef CONFIG_BOARDCTL_RESET_CAUSE
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int sam_get_reset_cause(void)
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{
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int ret;
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uint32_t rstsr;
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rstsr = getreg32(SAM_RSTC_SR);
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switch (rstsr & RSTC_SR_RSTTYP_MASK)
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{
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case RSTC_SR_RSTTYP_PWRUP:
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ret = SAMA5_RESET_PWRUP;
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break;
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case RSTC_SR_RSTTYP_BACKUP:
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ret = SAMA5_RESET_BACKUP;
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break;
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case RSTC_SR_RSTTYP_WDOG:
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ret = SAMA5_RESET_WDOG;
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break;
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case RSTC_SR_RSTTYP_SWRST:
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ret = SAMA5_RESET_SWRST;
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break;
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case RSTC_SR_RSTTYP_NRST:
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ret = SAMA5_RESET_NRST;
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break;
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default:
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ret = -1;
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break;
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}
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: up_systemreset
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*
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* Description:
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* Internal reset logic.
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*
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****************************************************************************/
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void up_systemreset(void)
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{
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uint32_t rstcr;
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#if defined(CONFIG_SAMA5_EXTRESET_ERST) && CONFIG_SAMA5_EXTRESET_ERST != 0
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uint32_t rstmr;
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#endif
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rstcr = (RSTC_CR_PROCRST | RSTC_CR_KEY);
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#if defined(CONFIG_ARCH_CHIP_SAMA5D3)
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rstcr |= RSTC_CR_PERRST;
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#endif
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#if defined(CONFIG_SAMA5_EXTRESET_ERST) && CONFIG_SAMA5_EXTRESET_ERST != 0
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rstcr |= RSTC_CR_EXTRST;
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rstmr = getreg32(SAM_RSTC_MR);
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rstmr &= ~RSTC_MR_ERSTL_MASK;
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rstmr &= RSTC_MR_ERSTL(CONFIG_SAMA5_EXTRESET_ERST - 1) | RSTC_MR_KEY;
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putreg32(rstmr, SAM_RSTC_MR);
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#endif
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putreg32(rstcr, SAM_RSTC_CR);
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/* Wait for the reset */
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for (; ; );
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}
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#endif /* CONFIG_SAMA5_SYSTEMRESET */
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