Hi,
On Tuesday 22 May 2018 06:57 PM, Alan Douglas wrote:
> 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);
> +}
shutdown callback can be added in a separate patch.
> +
> +
spurious blank line.
> 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");
It's preferable to have num-lanes property, which can be used to configure the
number of lanes supported in a platform even if it doesn't populate PHYs property.
> + 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);
For optional PHYs, devm_phy_optional_get() should be used.
Thanks
Kishon
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