124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/****************************************************************************
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* arch/arm/src/cxd56xx/cxd56_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 "hardware/cxd56_sph.h"
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#include "cxd56_sph.h"
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#include "arm_internal.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define SPH_SMP 14 /* Use hardware semaphore #14 */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_testset2
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****************************************************************************/
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spinlock_t up_testset2(volatile spinlock_t *lock)
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{
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register uintptr_t ret asm("r0") = (uintptr_t)(lock);
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asm volatile (
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"mov r1, #1 \n"
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"1: \n"
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"ldrexb r2, [%0] \n"
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"cmp r2, r1 \n"
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"beq 2f \n"
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"strexb r2, r1, [%0] \n"
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"cmp r2, r1 \n"
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"beq 1b \n"
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"dmb \n"
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"mov %0, #0 \n"
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"bx lr \n"
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"2: \n"
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"strexb r2, r1, [%0] \n" /* dummy strex to release */
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"mov %0, #1 \n"
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: "+r" (ret)
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:
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: "r1", "r2");
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return ret;
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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 an atomic test and set operation on the provided spinlock.
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* This function must be provided via the architecture-specific logic.
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*
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* Input Parameters:
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* lock - A reference to the spinlock object.
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*
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* Returned Value:
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* The spinlock is always locked upon return. The previous value of the
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* spinlock variable is returned, either SP_LOCKED if the spinlock was
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* 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 spinlock_t *lock)
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{
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#ifdef CONFIG_CXD56_TESTSET_WITH_HWSEM
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spinlock_t ret;
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uint32_t sphlocked = ((up_cpu_index() + 2) << 16) | 0x1;
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/* Lock hardware semaphore */
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do
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{
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putreg32(REQ_LOCK, CXD56_SPH_REQ(SPH_SMP));
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}
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while (getreg32(CXD56_SPH_STS(SPH_SMP)) != sphlocked);
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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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SP_DMB();
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}
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/* Unlock hardware semaphore */
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putreg32(REQ_UNLOCK, CXD56_SPH_REQ(SPH_SMP));
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#else
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spinlock_t ret = up_testset2(lock);
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#endif
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return ret;
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}
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