16cd363cb0
Summary: - This commit replaces license header under lc823450 Impact: - No impact Testing: - Build check only Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
100 lines
3.1 KiB
C
100 lines
3.1 KiB
C
/****************************************************************************
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* arch/arm/src/lc823450/lc823450_testset.c
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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 <nuttx/arch.h>
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#include <nuttx/spinlock.h>
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#include "arm_arch.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define LC823450_MUTEX_REG_BASE 0x40005000
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#define MUTEX_REG_MUTEX0 (LC823450_MUTEX_REG_BASE + 0x00)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_testset
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*
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* Description:
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* Perform and atomic test and set operation on the provided spinlock.
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*
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* This function must be provided via the architecture-specific logic.
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*
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* Note:
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* LC823450 does not support ldrex/strex. Instead, MUTEX is provided.
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*
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* Input Parameters:
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* lock - The address of spinlock object.
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*
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* Returned Value:
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* The spinlock is always locked upon return. The value of previous value
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* of the spinlock variable is returned, either SP_LOCKED if the spinlock
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* as previously locked (meaning that the test-and-set operation failed to
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* obtain the lock) or SP_UNLOCKED if the spinlock was previously unlocked
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* (meaning that we successfully obtained the lock)
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*
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****************************************************************************/
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spinlock_t up_testset(volatile FAR spinlock_t *lock)
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{
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uint32_t val;
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spinlock_t ret;
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irqstate_t flags;
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flags = up_irq_save();
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val = (up_cpu_index() << 16) | 0x1;
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do
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{
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putreg32(val, MUTEX_REG_MUTEX0);
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}
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while (getreg32(MUTEX_REG_MUTEX0) != val);
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SP_DMB();
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ret = *lock;
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if (ret == SP_UNLOCKED)
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{
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*lock = SP_LOCKED;
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}
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SP_DMB();
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val = (up_cpu_index() << 16) | 0x0;
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putreg32(val, MUTEX_REG_MUTEX0);
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up_irq_restore(flags);
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return ret;
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}
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