static int histb_pcie_probe()

in controller/dwc/pcie-histb.c [296:423]

• 104 lines of code
• 20 McCabe index (conditional complexity)

static int histb_pcie_probe(struct platform_device *pdev)
{
	struct histb_pcie *hipcie;
	struct dw_pcie *pci;
	struct pcie_port *pp;
	struct device_node *np = pdev->dev.of_node;
	struct device *dev = &pdev->dev;
	enum of_gpio_flags of_flags;
	unsigned long flag = GPIOF_DIR_OUT;
	int ret;

	hipcie = devm_kzalloc(dev, sizeof(*hipcie), GFP_KERNEL);
	if (!hipcie)
		return -ENOMEM;

	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
	if (!pci)
		return -ENOMEM;

	hipcie->pci = pci;
	pp = &pci->pp;
	pci->dev = dev;
	pci->ops = &dw_pcie_ops;

	hipcie->ctrl = devm_platform_ioremap_resource_byname(pdev, "control");
	if (IS_ERR(hipcie->ctrl)) {
		dev_err(dev, "cannot get control reg base\n");
		return PTR_ERR(hipcie->ctrl);
	}

	pci->dbi_base = devm_platform_ioremap_resource_byname(pdev, "rc-dbi");
	if (IS_ERR(pci->dbi_base)) {
		dev_err(dev, "cannot get rc-dbi base\n");
		return PTR_ERR(pci->dbi_base);
	}

	hipcie->vpcie = devm_regulator_get_optional(dev, "vpcie");
	if (IS_ERR(hipcie->vpcie)) {
		if (PTR_ERR(hipcie->vpcie) != -ENODEV)
			return PTR_ERR(hipcie->vpcie);
		hipcie->vpcie = NULL;
	}

	hipcie->reset_gpio = of_get_named_gpio_flags(np,
				"reset-gpios", 0, &of_flags);
	if (of_flags & OF_GPIO_ACTIVE_LOW)
		flag |= GPIOF_ACTIVE_LOW;
	if (gpio_is_valid(hipcie->reset_gpio)) {
		ret = devm_gpio_request_one(dev, hipcie->reset_gpio,
				flag, "PCIe device power control");
		if (ret) {
			dev_err(dev, "unable to request gpio\n");
			return ret;
		}
	}

	hipcie->aux_clk = devm_clk_get(dev, "aux");
	if (IS_ERR(hipcie->aux_clk)) {
		dev_err(dev, "Failed to get PCIe aux clk\n");
		return PTR_ERR(hipcie->aux_clk);
	}

	hipcie->pipe_clk = devm_clk_get(dev, "pipe");
	if (IS_ERR(hipcie->pipe_clk)) {
		dev_err(dev, "Failed to get PCIe pipe clk\n");
		return PTR_ERR(hipcie->pipe_clk);
	}

	hipcie->sys_clk = devm_clk_get(dev, "sys");
	if (IS_ERR(hipcie->sys_clk)) {
		dev_err(dev, "Failed to get PCIEe sys clk\n");
		return PTR_ERR(hipcie->sys_clk);
	}

	hipcie->bus_clk = devm_clk_get(dev, "bus");
	if (IS_ERR(hipcie->bus_clk)) {
		dev_err(dev, "Failed to get PCIe bus clk\n");
		return PTR_ERR(hipcie->bus_clk);
	}

	hipcie->soft_reset = devm_reset_control_get(dev, "soft");
	if (IS_ERR(hipcie->soft_reset)) {
		dev_err(dev, "couldn't get soft reset\n");
		return PTR_ERR(hipcie->soft_reset);
	}

	hipcie->sys_reset = devm_reset_control_get(dev, "sys");
	if (IS_ERR(hipcie->sys_reset)) {
		dev_err(dev, "couldn't get sys reset\n");
		return PTR_ERR(hipcie->sys_reset);
	}

	hipcie->bus_reset = devm_reset_control_get(dev, "bus");
	if (IS_ERR(hipcie->bus_reset)) {
		dev_err(dev, "couldn't get bus reset\n");
		return PTR_ERR(hipcie->bus_reset);
	}

	hipcie->phy = devm_phy_get(dev, "phy");
	if (IS_ERR(hipcie->phy)) {
		dev_info(dev, "no pcie-phy found\n");
		hipcie->phy = NULL;
		/* fall through here!
		 * if no pcie-phy found, phy init
		 * should be done under boot!
		 */
	} else {
		phy_init(hipcie->phy);
	}

	pp->ops = &histb_pcie_host_ops;

	platform_set_drvdata(pdev, hipcie);

	ret = histb_pcie_host_enable(pp);
	if (ret) {
		dev_err(dev, "failed to enable host\n");
		return ret;
	}

	ret = dw_pcie_host_init(pp);
	if (ret) {
		dev_err(dev, "failed to initialize host\n");
		return ret;
	}

	return 0;
}