Function ofw_device_dma_ops

components/drivers/dma/dma_pool.c:168–234

};

static const struct rt_dma_map_ops *ofw_device_dma_ops(struct rt_device *dev)
{
    rt_err_t err;
    int region_nr = 0;
    const fdt32_t *cell;
    rt_phandle phandle;
    rt_region_t region;
    struct rt_ofw_prop *prop;
    struct rt_dma_pool *dma_pool;
    const struct rt_dma_map_ops *ops = RT_NULL;
    struct rt_ofw_node *mem_np, *np = dev->ofw_node;

    rt_ofw_foreach_prop_u32(np, "memory-region", prop, cell, phandle)
    {
        rt_uint64_t addr, size;

        if (!(mem_np = rt_ofw_find_node_by_phandle(phandle)))
        {
            if (region_nr == 0)
            {
                return RT_NULL;
            }

            break;
        }

        if ((err = rt_ofw_get_address(mem_np, 0, &addr, &size)))
        {
            LOG_E("%s: Read '%s' error = %s", rt_ofw_node_full_name(mem_np),
                    "memory-region", rt_strerror(err));

            rt_ofw_node_put(mem_np);
            continue;
        }

        region.start = addr;
        region.end = addr + size;
        region.name = rt_dm_dev_get_name(dev);

        rt_ofw_node_put(mem_np);

        if (!(dma_pool = dma_pool_install(&region)))
        {
            return RT_NULL;
        }

        if (rt_ofw_prop_read_bool(mem_np, "no-map"))
        {
            dma_pool->flags |= RT_DMA_F_NOMAP;
        }

        if (!rt_dma_device_is_coherent(dev))
        {
            dma_pool->flags |= RT_DMA_F_NOCACHE;
        }

        dma_pool->dev = dev;
        ++region_nr;