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path: root/drivers/pci/controller/pcie-cadence.c
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Diffstat (limited to 'drivers/pci/controller/pcie-cadence.c')
-rw-r--r--drivers/pci/controller/pcie-cadence.c123
1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/pci/controller/pcie-cadence.c b/drivers/pci/controller/pcie-cadence.c
index 138d113eb45d..86f1b002c846 100644
--- a/drivers/pci/controller/pcie-cadence.c
+++ b/drivers/pci/controller/pcie-cadence.c
@@ -124,3 +124,126 @@ void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r)
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), 0);
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), 0);
}
+
+void cdns_pcie_disable_phy(struct cdns_pcie *pcie)
+{
+ int i = pcie->phy_count;
+
+ while (i--) {
+ phy_power_off(pcie->phy[i]);
+ phy_exit(pcie->phy[i]);
+ }
+}
+
+int cdns_pcie_enable_phy(struct cdns_pcie *pcie)
+{
+ int ret;
+ int i;
+
+ for (i = 0; i < pcie->phy_count; i++) {
+ ret = phy_init(pcie->phy[i]);
+ if (ret < 0)
+ goto err_phy;
+
+ ret = phy_power_on(pcie->phy[i]);
+ if (ret < 0) {
+ phy_exit(pcie->phy[i]);
+ goto err_phy;
+ }
+ }
+
+ return 0;
+
+err_phy:
+ while (--i >= 0) {
+ phy_power_off(pcie->phy[i]);
+ phy_exit(pcie->phy[i]);
+ }
+
+ return ret;
+}
+
+int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie)
+{
+ struct device_node *np = dev->of_node;
+ int phy_count;
+ struct phy **phy;
+ struct device_link **link;
+ int i;
+ int ret;
+ const char *name;
+
+ phy_count = of_property_count_strings(np, "phy-names");
+ if (phy_count < 1) {
+ dev_err(dev, "no phy-names. PHY will not be initialized\n");
+ pcie->phy_count = 0;
+ return 0;
+ }
+
+ phy = devm_kzalloc(dev, sizeof(*phy) * phy_count, GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ link = devm_kzalloc(dev, sizeof(*link) * phy_count, GFP_KERNEL);
+ if (!link)
+ return -ENOMEM;
+
+ for (i = 0; i < phy_count; i++) {
+ of_property_read_string_index(np, "phy-names", i, &name);
+ phy[i] = devm_phy_optional_get(dev, name);
+ if (IS_ERR(phy))
+ return PTR_ERR(phy);
+
+ link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS);
+ if (!link[i]) {
+ ret = -EINVAL;
+ goto err_link;
+ }
+ }
+
+ pcie->phy_count = phy_count;
+ pcie->phy = phy;
+ pcie->link = link;
+
+ ret = cdns_pcie_enable_phy(pcie);
+ if (ret)
+ goto err_link;
+
+ return 0;
+
+err_link:
+ while (--i >= 0)
+ device_link_del(link[i]);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int cdns_pcie_suspend_noirq(struct device *dev)
+{
+ struct cdns_pcie *pcie = dev_get_drvdata(dev);
+
+ cdns_pcie_disable_phy(pcie);
+
+ return 0;
+}
+
+static int cdns_pcie_resume_noirq(struct device *dev)
+{
+ struct cdns_pcie *pcie = dev_get_drvdata(dev);
+ int ret;
+
+ ret = cdns_pcie_enable_phy(pcie);
+ if (ret) {
+ dev_err(dev, "failed to enable phy\n");
+ return ret;
+ }
+
+ return 0;
+}
+#endif
+
+const struct dev_pm_ops cdns_pcie_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(cdns_pcie_suspend_noirq,
+ cdns_pcie_resume_noirq)
+};