From: Alan Douglas <adouglas@xxxxxxxxxxx>
If PHYs are present, they will be initialized and enabled in driver probe,
and disabled in driver shutdown.
Signed-off-by: Alan Douglas <adouglas@xxxxxxxxxxx>
---
drivers/pci/cadence/pcie-cadence-ep.c | 14 ++++-
drivers/pci/cadence/pcie-cadence-host.c | 31 +++++++++++
drivers/pci/cadence/pcie-cadence.c | 93 +++++++++++++++++++++++++++++++++
drivers/pci/cadence/pcie-cadence.h | 7 +++
4 files changed, 144 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
index 3d8283e..2581caf 100644
--- a/drivers/pci/cadence/pcie-cadence-ep.c
+++ b/drivers/pci/cadence/pcie-cadence-ep.c
@@ -439,6 +439,7 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
struct pci_epc *epc;
struct resource *res;
int ret;
+ int phy_count;
ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
if (!ep)
@@ -472,6 +473,12 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
if (!ep->ob_addr)
return -ENOMEM;
+ ret = cdns_pcie_init_phy(dev, pcie);
+ if (ret) {
+ dev_err(dev, "failed to init phy\n");
+ return ret;
+ }
+ platform_set_drvdata(pdev, pcie);
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
@@ -520,6 +527,10 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
err_get_sync:
pm_runtime_disable(dev);
+ cdns_pcie_disable_phy(pcie);
+ phy_count = pcie->phy_count;
+ while (phy_count--)
+ device_link_del(pcie->link[phy_count]);
return ret;
}
@@ -527,6 +538,7 @@ static int cdns_pcie_ep_probe(struct platform_device *pdev)
static void cdns_pcie_ep_shutdown(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct cdns_pcie *pcie = dev_get_drvdata(dev);
int ret;
ret = pm_runtime_put_sync(dev);
@@ -535,7 +547,7 @@ static void cdns_pcie_ep_shutdown(struct platform_device *pdev)
pm_runtime_disable(dev);
- /* The PCIe controller can't be disabled. */
+ cdns_pcie_disable_phy(pcie);
}
static struct platform_driver cdns_pcie_ep_driver = {
diff --git a/drivers/pci/cadence/pcie-cadence-host.c b/drivers/pci/cadence/pcie-cadence-host.c
index a4ebbd3..7536926a 100644
--- a/drivers/pci/cadence/pcie-cadence-host.c
+++ b/drivers/pci/cadence/pcie-cadence-host.c
@@ -58,6 +58,9 @@ static void __iomem *cdns_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
return pcie->reg_base + (where & 0xfff);
}
+ /* Check that the link is up */
+ if (!(cdns_pcie_readl(pcie, CDNS_PCIE_LM_BASE) & 0x1))
+ return NULL;
/* Update Output registers for AXI region 0. */
addr0 = CDNS_PCIE_AT_OB_REGION_PCI_ADDR0_NBITS(12) |
@@ -239,6 +242,7 @@ static int cdns_pcie_host_probe(struct platform_device *pdev)
struct cdns_pcie *pcie;
struct resource *res;
int ret;
+ int phy_count;
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*rc));
if (!bridge)
@@ -290,6 +294,13 @@ static int cdns_pcie_host_probe(struct platform_device *pdev)
}
pcie->mem_res = res;
+ ret = cdns_pcie_init_phy(dev, pcie);
+ if (ret) {
+ dev_err(dev, "failed to init phy\n");
+ return ret;
+ }
+ platform_set_drvdata(pdev, pcie);
+
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
@@ -322,15 +333,35 @@ static int cdns_pcie_host_probe(struct platform_device *pdev)
err_get_sync:
pm_runtime_disable(dev);
+ cdns_pcie_disable_phy(pcie);
+ phy_count = pcie->phy_count;
+ while (phy_count--)
+ device_link_del(pcie->link[phy_count]);
return ret;
}
+static void cdns_pcie_shutdown(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cdns_pcie *pcie = dev_get_drvdata(dev);
+ int ret;
+
+ ret = pm_runtime_put_sync(dev);
+ if (ret < 0)
+ dev_dbg(dev, "pm_runtime_put_sync failed\n");
+
+ pm_runtime_disable(dev);
+ cdns_pcie_disable_phy(pcie);
+}
+
+
static struct platform_driver cdns_pcie_host_driver = {
.driver = {
.name = "cdns-pcie-host",
.of_match_table = cdns_pcie_host_of_match,
},
.probe = cdns_pcie_host_probe,
+ .shutdown = cdns_pcie_shutdown,
};
builtin_platform_driver(cdns_pcie_host_driver);
diff --git a/drivers/pci/cadence/pcie-cadence.c b/drivers/pci/cadence/pcie-cadence.c
index 138d113..681609a 100644
--- a/drivers/pci/cadence/pcie-cadence.c
+++ b/drivers/pci/cadence/pcie-cadence.c
@@ -124,3 +124,96 @@ 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_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;
+}
diff --git a/drivers/pci/cadence/pcie-cadence.h b/drivers/pci/cadence/pcie-cadence.h
index ed336cc..b342c80 100644
--- a/drivers/pci/cadence/pcie-cadence.h
+++ b/drivers/pci/cadence/pcie-cadence.h
@@ -8,6 +8,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
+#include <linux/phy/phy.h>
/*
* Local Management Registers
@@ -229,6 +230,9 @@ struct cdns_pcie {
struct resource *mem_res;
bool is_rc;
u8 bus;
+ int phy_count;
+ struct phy **phy;
+ struct device_link **link;
};
/* Register access */
@@ -307,5 +311,8 @@ void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u8 fn,
u32 r, u64 cpu_addr);
void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r);
+void cdns_pcie_disable_phy(struct cdns_pcie *pcie);
+int cdns_pcie_enable_phy(struct cdns_pcie *pcie);
+int cdns_pcie_init_phy(struct device *dev, struct cdns_pcie *pcie);
#endif /* _PCIE_CADENCE_H */
--
2.2.2
