drivers/pci/controller/cadence/pcie-cadence-plat.c

Source file repositories/reference/linux-study-clean/drivers/pci/controller/cadence/pcie-cadence-plat.c

File Facts

System
Linux kernel
Corpus path
drivers/pci/controller/cadence/pcie-cadence-plat.c
Extension
.c
Size
4111 bytes
Lines
180
Domain
Representative Device Path
Bucket
PCIe NVMe Storage Path
Inferred role
Representative Device Path: implementation source
Status
source implementation candidate

Why This File Exists

Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.

Dependency Surface

Detected Declarations

Annotated Snippet

struct cdns_plat_pcie {
	struct cdns_pcie        *pcie;
};

static const struct of_device_id cdns_plat_pcie_of_match[];

static u64 cdns_plat_cpu_addr_fixup(struct cdns_pcie *pcie, u64 cpu_addr)
{
	return cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR;
}

static const struct cdns_pcie_ops cdns_plat_ops = {
	.cpu_addr_fixup = cdns_plat_cpu_addr_fixup,
};

static int cdns_plat_pcie_probe(struct platform_device *pdev)
{
	const struct cdns_plat_pcie_of_data *data;
	struct cdns_plat_pcie *cdns_plat_pcie;
	struct device *dev = &pdev->dev;
	struct pci_host_bridge *bridge;
	struct cdns_pcie_ep *ep;
	struct cdns_pcie_rc *rc;
	int phy_count;
	bool is_rc;
	int ret;

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

	is_rc = data->is_rc;

	pr_debug(" Started %s with is_rc: %d\n", __func__, is_rc);
	cdns_plat_pcie = devm_kzalloc(dev, sizeof(*cdns_plat_pcie), GFP_KERNEL);
	if (!cdns_plat_pcie)
		return -ENOMEM;

	platform_set_drvdata(pdev, cdns_plat_pcie);
	if (is_rc) {
		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_HOST))
			return -ENODEV;

		bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
		if (!bridge)
			return -ENOMEM;

		rc = pci_host_bridge_priv(bridge);
		rc->pcie.dev = dev;
		rc->pcie.ops = &cdns_plat_ops;
		cdns_plat_pcie->pcie = &rc->pcie;

		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
		if (ret) {
			dev_err(dev, "failed to init phy\n");
			return ret;
		}
		pm_runtime_enable(dev);
		ret = pm_runtime_get_sync(dev);
		if (ret < 0) {
			dev_err(dev, "pm_runtime_get_sync() failed\n");
			goto err_get_sync;
		}

		ret = cdns_pcie_host_setup(rc);
		if (ret)
			goto err_init;
	} else {
		if (!IS_ENABLED(CONFIG_PCIE_CADENCE_PLAT_EP))
			return -ENODEV;

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

		ep->pcie.dev = dev;
		ep->pcie.ops = &cdns_plat_ops;
		cdns_plat_pcie->pcie = &ep->pcie;

		ret = cdns_pcie_init_phy(dev, cdns_plat_pcie->pcie);
		if (ret) {
			dev_err(dev, "failed to init phy\n");
			return ret;
		}

		pm_runtime_enable(dev);
		ret = pm_runtime_get_sync(dev);
		if (ret < 0) {
			dev_err(dev, "pm_runtime_get_sync() failed\n");
			goto err_get_sync;

Annotation

Implementation Notes