Function ofw_msi_pic_init

components/drivers/pci/ofw.c:463–529

* RID (Requester ID) is formatted such that: * Bits [15:8] are the Bus number. * Bits [7:3] are the Device number. * Bits [2:0] are the Function number. * * msi-map: Maps a Requester ID to an MSI controller and associated * msi-specifier data. The property is an arbitrary number of tuples of * (rid-base,msi-controller,msi-base,length), where: * * - rid-base is a single cell descri

 *  };
 */
static void ofw_msi_pic_init(struct rt_pci_device *pdev)
{
#ifdef RT_PCI_MSI
    rt_uint32_t rid;
    struct rt_pci_host_bridge *bridge;
    struct rt_ofw_node *np, *msi_ic_np = RT_NULL;

    /*
     * NOTE: Typically, a device's RID is equal to the PCI device's ID.
     * However, in complex bus management scenarios such as servers and PCs,
     * the RID needs to be associated with DMA. In these cases,
     * the RID should be equal to the DMA alias assigned to the
     * PCI device by the system bus.
     */
    rid = rt_pci_dev_id(pdev);

    bridge = rt_pci_find_host_bridge(pdev->bus);
    RT_ASSERT(bridge != RT_NULL);

    np = bridge->parent.ofw_node;

    if (!(msi_ic_np = rt_ofw_parse_phandle(np, "msi-parent", 0)))
    {
        rt_ofw_map_id(np, rid, "msi-map", "msi-map-mask", &msi_ic_np, RT_NULL);
    }

    if (!msi_ic_np)
    {
        LOG_W("%s: MSI PIC not found", rt_dm_dev_get_name(&pdev->parent));

        return;
    }

    pdev->msi_pic = rt_pic_dynamic_cast(rt_ofw_data(msi_ic_np));

    if (!pdev->msi_pic)
    {
        LOG_W("%s: '%s' not supported", rt_dm_dev_get_name(&pdev->parent), "msi-parent");

        goto _out_put_msi_parent_node;
    }

    if (!pdev->msi_pic->ops->irq_compose_msi_msg)
    {
        LOG_E("%s: MSI pic MUST implemented %s",
                rt_ofw_node_full_name(msi_ic_np), "irq_compose_msi_msg");
        RT_ASSERT(0);
    }

    if (!pdev->msi_pic->ops->irq_alloc_msi)
    {
        LOG_E("%s: MSI pic MUST implemented %s",
                rt_ofw_node_full_name(msi_ic_np), "irq_alloc_msi");
        RT_ASSERT(0);
    }

    if (!pdev->msi_pic->ops->irq_free_msi)
    {