int qnoc_probe()

in qcom/icc-rpm.c [298:437]
110 lines of code
21 McCabe index (conditional complexity)

int qnoc_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct qcom_icc_desc *desc;
	struct icc_onecell_data *data;
	struct icc_provider *provider;
	struct qcom_icc_node **qnodes;
	struct qcom_icc_provider *qp;
	struct icc_node *node;
	size_t num_nodes, i;
	const char * const *cds;
	int cd_num;
	int ret;

	/* wait for the RPM proxy */
	if (!qcom_icc_rpm_smd_available())
		return -EPROBE_DEFER;

	desc = of_device_get_match_data(dev);
	if (!desc)
		return -EINVAL;

	qnodes = desc->nodes;
	num_nodes = desc->num_nodes;

	if (desc->num_clocks) {
		cds = desc->clocks;
		cd_num = desc->num_clocks;
	} else {
		cds = bus_clocks;
		cd_num = ARRAY_SIZE(bus_clocks);
	}

	qp = devm_kzalloc(dev, struct_size(qp, bus_clks, cd_num), GFP_KERNEL);
	if (!qp)
		return -ENOMEM;

	data = devm_kzalloc(dev, struct_size(data, nodes, num_nodes),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	for (i = 0; i < cd_num; i++)
		qp->bus_clks[i].id = cds[i];
	qp->num_clks = cd_num;

	qp->type = desc->type;
	qp->qos_offset = desc->qos_offset;

	if (desc->regmap_cfg) {
		struct resource *res;
		void __iomem *mmio;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!res) {
			/* Try parent's regmap */
			qp->regmap = dev_get_regmap(dev->parent, NULL);
			if (qp->regmap)
				goto regmap_done;
			return -ENODEV;
		}

		mmio = devm_ioremap_resource(dev, res);

		if (IS_ERR(mmio)) {
			dev_err(dev, "Cannot ioremap interconnect bus resource\n");
			return PTR_ERR(mmio);
		}

		qp->regmap = devm_regmap_init_mmio(dev, mmio, desc->regmap_cfg);
		if (IS_ERR(qp->regmap)) {
			dev_err(dev, "Cannot regmap interconnect bus resource\n");
			return PTR_ERR(qp->regmap);
		}
	}

regmap_done:
	ret = devm_clk_bulk_get(dev, qp->num_clks, qp->bus_clks);
	if (ret)
		return ret;

	ret = clk_bulk_prepare_enable(qp->num_clks, qp->bus_clks);
	if (ret)
		return ret;

	if (desc->has_bus_pd) {
		ret = dev_pm_domain_attach(dev, true);
		if (ret)
			return ret;
	}

	provider = &qp->provider;
	INIT_LIST_HEAD(&provider->nodes);
	provider->dev = dev;
	provider->set = qcom_icc_set;
	provider->aggregate = icc_std_aggregate;
	provider->xlate = of_icc_xlate_onecell;
	provider->data = data;

	ret = icc_provider_add(provider);
	if (ret) {
		dev_err(dev, "error adding interconnect provider: %d\n", ret);
		clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks);
		return ret;
	}

	for (i = 0; i < num_nodes; i++) {
		size_t j;

		node = icc_node_create(qnodes[i]->id);
		if (IS_ERR(node)) {
			ret = PTR_ERR(node);
			goto err;
		}

		node->name = qnodes[i]->name;
		node->data = qnodes[i];
		icc_node_add(node, provider);

		for (j = 0; j < qnodes[i]->num_links; j++)
			icc_link_create(node, qnodes[i]->links[j]);

		data->nodes[i] = node;
	}
	data->num_nodes = num_nodes;

	platform_set_drvdata(pdev, qp);

	/* Populate child NoC devices if any */
	if (of_get_child_count(dev->of_node) > 0)
		return of_platform_populate(dev->of_node, NULL, NULL, dev);

	return 0;
err:
	icc_nodes_remove(provider);
	clk_bulk_disable_unprepare(qp->num_clks, qp->bus_clks);
	icc_provider_del(provider);

	return ret;
}