Function rt_dma_alloc

components/drivers/dma/dma_pool.c:410–444

}

void *rt_dma_alloc(struct rt_device *dev, rt_size_t size,
        rt_ubase_t *dma_handle, rt_ubase_t flags)
{
    void *dma_buffer = RT_NULL;
    rt_ubase_t dma_handle_s = 0;
    const struct rt_dma_map_ops *ops;

    if (!dev || !size)
    {
        return RT_NULL;
    }

    ops = device_dma_ops(dev);

    if (ops->alloc)
    {
        dma_buffer = ops->alloc(dev, size, &dma_handle_s, flags);
    }
    else
    {
        dma_buffer = dma_alloc(dev, size, &dma_handle_s, flags);
    }

    if (!dma_buffer)
    {
        return dma_buffer;
    }

    if (dma_handle)
    {
        *dma_handle = dma_handle_s;
    }

    return dma_buffer;
}

void rt_dma_free(struct rt_device *dev, rt_size_t size,
        void *cpu_addr, rt_ubase_t dma_handle, rt_ubase_t flags)