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/* Copyright Canaan Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <rtthread.h>
#include "dmalock.h"
struct dmac_host
{
struct rt_semaphore sem;
struct rt_mutex mutex;
uint8_t channel_used[DMAC_CHANNEL_COUNT];
char *channel_name[DMAC_CHANNEL_COUNT];
};
static struct dmac_host _dmac_host;
void dmalock_init(void)
{
rt_sem_init(&_dmac_host.sem, "dma_sem", DMAC_CHANNEL_COUNT, RT_IPC_FLAG_FIFO);
rt_mutex_init(&_dmac_host.mutex, "dma_mutex", RT_IPC_FLAG_PRIO);
for (int i = 0; i < DMAC_CHANNEL_COUNT; i++)
{
_dmac_host.channel_used[i] = 0;
_dmac_host.channel_name[i] = NULL;
}
}
int _dmalock_sync_take(dmac_channel_number_t *chn, int timeout_ms, const char *name)
{
rt_err_t result;
*chn = DMAC_CHANNEL_MAX;
result = rt_sem_take(&_dmac_host.sem, timeout_ms);
if (result == RT_EOK)
{
rt_mutex_take(&_dmac_host.mutex, RT_WAITING_FOREVER);
for (int i = 0; i < DMAC_CHANNEL_COUNT; i++)
{
if (_dmac_host.channel_used[i] == 0)
{
_dmac_host.channel_used[i] = 1;
_dmac_host.channel_name[i] = name;
*chn = i;
break;
}
}
rt_mutex_release(&_dmac_host.mutex);
}
return result;
}
void dmalock_release(dmac_channel_number_t chn)
{
if (chn >= DMAC_CHANNEL_MAX)
return;
_dmac_host.channel_name[chn] = NULL;
_dmac_host.channel_used[chn] = 0;
rt_sem_release(&_dmac_host.sem);
}
static void dma_ch_info(int argc, char **argv)
{
uint32_t cnt = 0;
for (int i = 0; i < DMAC_CHANNEL_COUNT; i++)
{
if (_dmac_host.channel_used[i] != 0)
{
rt_kprintf("dma_ch%d is using by func [%s]\n", i, _dmac_host.channel_name[i]);
cnt++;
}
}
if(cnt == 0)
rt_kprintf(" no dma_ch is using.\n");
}
MSH_CMD_EXPORT(dma_ch_info, list dma channel informationn.);
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