109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <platform/iomap.h>
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#include <platform/remote_spinlock.h>
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#include <debug.h>
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#include <smem.h>
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#include <reg.h>
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static struct smem *smem = (void *)(MSM_SHARED_BASE);
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void *smem_rlock_get_entry(unsigned id, unsigned *size)
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{
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struct smem_alloc_info *ainfo;
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void *ret = 0;
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unsigned long flags = 0;
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ainfo = &smem->alloc_info[id];
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if (readl(&ainfo->allocated) == 0) {
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dprintf(SPEW,"Shared memory is not allocated\n");
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return ret;
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}
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/* Read the DAL area */
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*size = readl(&ainfo->size);
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ret = (void *) (MSM_SHARED_BASE + readl(&ainfo->offset));
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return ret;
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}
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int remote_spinlock_init(remote_spinlock_t *lock)
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{
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struct rlock_chunk_header *cur_header;
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void *rlock_smem_start, *rlock_smem_end;
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uint32_t rlock_smem_size = 0;
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int smem_status = 0;
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rlock_smem_start = smem_rlock_get_entry(SMEM_RLOCK_AREA, &rlock_smem_size);
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if (!rlock_smem_start) {
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dprintf(CRITICAL,"Failed to get smem entry for remote spin lock\n");
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return 1;
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}
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rlock_smem_end = rlock_smem_start + rlock_smem_size;
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cur_header = (struct rlock_chunk_header *)
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(((uint32_t)rlock_smem_start + (4095)) & ~4095);
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*lock = NULL;
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/* Find the lock from the list */
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while (cur_header->size != 0
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&& ((uint32_t)(cur_header + 1) < (uint32_t)rlock_smem_end)) {
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/* If we found the lock, get the address */
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if (!strncmp(cur_header->name, RLOCK_CHUNK_NAME,
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RLOCK_CHUNK_NAME_LENGTH)) {
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*lock = (remote_spinlock_t)&cur_header->lock;
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return 0;
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}
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cur_header = (void *)cur_header + cur_header->size;
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}
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dprintf(CRITICAL,"%s: remote lock not found: %s\n",RLOCK_CHUNK_NAME,__FILE__);
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return 1;
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}
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void remote_spin_lock(raw_remote_spinlock_t *lock)
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{
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lock->dek.self_lock = DEK_LOCK_REQUEST;
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/* check if the lock is available*/
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while(lock->dek.other_lock) {
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if(lock->dek.next_yield == DEK_YIELD_TURN_SELF)
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while (lock->dek.other_lock);
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lock->dek.self_lock = DEK_LOCK_REQUEST;
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}
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/* We acquired the lock */
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lock->dek.next_yield = DEK_YIELD_TURN_SELF;
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dmb();
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}
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void remote_spin_unlock(raw_remote_spinlock_t *lock)
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{
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dmb();
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lock->dek.self_lock = DEK_LOCK_YIELD;
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}
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