91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
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/* Copyright Canaan Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <rtthread.h>
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#include "dmalock.h"
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struct dmac_host
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{
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struct rt_semaphore sem;
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struct rt_mutex mutex;
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uint8_t channel_used[DMAC_CHANNEL_COUNT];
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char *channel_name[DMAC_CHANNEL_COUNT];
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};
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static struct dmac_host _dmac_host;
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void dmalock_init(void)
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{
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rt_sem_init(&_dmac_host.sem, "dma_sem", DMAC_CHANNEL_COUNT, RT_IPC_FLAG_FIFO);
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rt_mutex_init(&_dmac_host.mutex, "dma_mutex", RT_IPC_FLAG_FIFO);
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for (int i = 0; i < DMAC_CHANNEL_COUNT; i++)
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{
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_dmac_host.channel_used[i] = 0;
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_dmac_host.channel_name[i] = NULL;
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}
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}
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int _dmalock_sync_take(dmac_channel_number_t *chn, int timeout_ms, const char *name)
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{
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rt_err_t result;
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*chn = DMAC_CHANNEL_MAX;
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result = rt_sem_take(&_dmac_host.sem, timeout_ms);
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if (result == RT_EOK)
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{
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rt_mutex_take(&_dmac_host.mutex, RT_WAITING_FOREVER);
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for (int i = 0; i < DMAC_CHANNEL_COUNT; i++)
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{
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if (_dmac_host.channel_used[i] == 0)
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{
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_dmac_host.channel_used[i] = 1;
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_dmac_host.channel_name[i] = name;
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*chn = i;
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break;
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}
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}
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rt_mutex_release(&_dmac_host.mutex);
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}
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return result;
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}
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void dmalock_release(dmac_channel_number_t chn)
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{
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if (chn >= DMAC_CHANNEL_MAX)
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return;
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_dmac_host.channel_name[chn] = NULL;
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_dmac_host.channel_used[chn] = 0;
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rt_sem_release(&_dmac_host.sem);
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}
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static void dma_ch_info(int argc, char **argv)
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{
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uint32_t cnt = 0;
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for (int i = 0; i < DMAC_CHANNEL_COUNT; i++)
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{
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if (_dmac_host.channel_used[i] != 0)
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{
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rt_kprintf("dma_ch%d is using by func [%s]\n", i, _dmac_host.channel_name[i]);
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cnt++;
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}
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}
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if(cnt == 0)
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rt_kprintf(" no dma_ch is using.\n");
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}
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MSH_CMD_EXPORT(dma_ch_info, list dma channel informationn.);
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