diff options
Diffstat (limited to 'drivers/pci/host/pci-tegra.c')
| -rw-r--r-- | drivers/pci/host/pci-tegra.c | 244 |
1 files changed, 227 insertions, 17 deletions
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c index 68d1f41b3..c388468c2 100644 --- a/drivers/pci/host/pci-tegra.c +++ b/drivers/pci/host/pci-tegra.c @@ -295,6 +295,7 @@ struct tegra_pcie { struct reset_control *afi_rst; struct reset_control *pcie_xrst; + bool legacy_phy; struct phy *phy; struct tegra_msi msi; @@ -311,11 +312,14 @@ struct tegra_pcie { struct tegra_pcie_port { struct tegra_pcie *pcie; + struct device_node *np; struct list_head list; struct resource regs; void __iomem *base; unsigned int index; unsigned int lanes; + + struct phy **phys; }; struct tegra_pcie_bus { @@ -860,6 +864,128 @@ static int tegra_pcie_phy_enable(struct tegra_pcie *pcie) return 0; } +static int tegra_pcie_phy_disable(struct tegra_pcie *pcie) +{ + const struct tegra_pcie_soc_data *soc = pcie->soc_data; + u32 value; + + /* disable TX/RX data */ + value = pads_readl(pcie, PADS_CTL); + value &= ~(PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L); + pads_writel(pcie, value, PADS_CTL); + + /* override IDDQ */ + value = pads_readl(pcie, PADS_CTL); + value |= PADS_CTL_IDDQ_1L; + pads_writel(pcie, PADS_CTL, value); + + /* reset PLL */ + value = pads_readl(pcie, soc->pads_pll_ctl); + value &= ~PADS_PLL_CTL_RST_B4SM; + pads_writel(pcie, value, soc->pads_pll_ctl); + + usleep_range(20, 100); + + return 0; +} + +static int tegra_pcie_port_phy_power_on(struct tegra_pcie_port *port) +{ + struct device *dev = port->pcie->dev; + unsigned int i; + int err; + + for (i = 0; i < port->lanes; i++) { + err = phy_power_on(port->phys[i]); + if (err < 0) { + dev_err(dev, "failed to power on PHY#%u: %d\n", i, + err); + return err; + } + } + + return 0; +} + +static int tegra_pcie_port_phy_power_off(struct tegra_pcie_port *port) +{ + struct device *dev = port->pcie->dev; + unsigned int i; + int err; + + for (i = 0; i < port->lanes; i++) { + err = phy_power_off(port->phys[i]); + if (err < 0) { + dev_err(dev, "failed to power off PHY#%u: %d\n", i, + err); + return err; + } + } + + return 0; +} + +static int tegra_pcie_phy_power_on(struct tegra_pcie *pcie) +{ + struct tegra_pcie_port *port; + int err; + + if (pcie->legacy_phy) { + if (pcie->phy) + err = phy_power_on(pcie->phy); + else + err = tegra_pcie_phy_enable(pcie); + + if (err < 0) + dev_err(pcie->dev, "failed to power on PHY: %d\n", err); + + return err; + } + + list_for_each_entry(port, &pcie->ports, list) { + err = tegra_pcie_port_phy_power_on(port); + if (err < 0) { + dev_err(pcie->dev, + "failed to power on PCIe port %u PHY: %d\n", + port->index, err); + return err; + } + } + + return 0; +} + +static int tegra_pcie_phy_power_off(struct tegra_pcie *pcie) +{ + struct tegra_pcie_port *port; + int err; + + if (pcie->legacy_phy) { + if (pcie->phy) + err = phy_power_off(pcie->phy); + else + err = tegra_pcie_phy_disable(pcie); + + if (err < 0) + dev_err(pcie->dev, "failed to power off PHY: %d\n", + err); + + return err; + } + + list_for_each_entry(port, &pcie->ports, list) { + err = tegra_pcie_port_phy_power_off(port); + if (err < 0) { + dev_err(pcie->dev, + "failed to power off PCIe port %u PHY: %d\n", + port->index, err); + return err; + } + } + + return 0; +} + static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) { const struct tegra_pcie_soc_data *soc = pcie->soc_data; @@ -899,13 +1025,9 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie) afi_writel(pcie, value, AFI_FUSE); } - if (!pcie->phy) - err = tegra_pcie_phy_enable(pcie); - else - err = phy_power_on(pcie->phy); - + err = tegra_pcie_phy_power_on(pcie); if (err < 0) { - dev_err(pcie->dev, "failed to power on PHY: %d\n", err); + dev_err(pcie->dev, "failed to power on PHY(s): %d\n", err); return err; } @@ -942,9 +1064,9 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie) /* TODO: disable and unprepare clocks? */ - err = phy_power_off(pcie->phy); + err = tegra_pcie_phy_power_off(pcie); if (err < 0) - dev_warn(pcie->dev, "failed to power off PHY: %d\n", err); + dev_err(pcie->dev, "failed to power off PHY(s): %d\n", err); reset_control_assert(pcie->pcie_xrst); reset_control_assert(pcie->afi_rst); @@ -1049,6 +1171,100 @@ static int tegra_pcie_resets_get(struct tegra_pcie *pcie) return 0; } +static int tegra_pcie_phys_get_legacy(struct tegra_pcie *pcie) +{ + int err; + + pcie->phy = devm_phy_optional_get(pcie->dev, "pcie"); + if (IS_ERR(pcie->phy)) { + err = PTR_ERR(pcie->phy); + dev_err(pcie->dev, "failed to get PHY: %d\n", err); + return err; + } + + err = phy_init(pcie->phy); + if (err < 0) { + dev_err(pcie->dev, "failed to initialize PHY: %d\n", err); + return err; + } + + pcie->legacy_phy = true; + + return 0; +} + +static struct phy *devm_of_phy_optional_get_index(struct device *dev, + struct device_node *np, + const char *consumer, + unsigned int index) +{ + struct phy *phy; + char *name; + + name = kasprintf(GFP_KERNEL, "%s-%u", consumer, index); + if (!name) + return ERR_PTR(-ENOMEM); + + phy = devm_of_phy_get(dev, np, name); + kfree(name); + + if (IS_ERR(phy) && PTR_ERR(phy) == -ENODEV) + phy = NULL; + + return phy; +} + +static int tegra_pcie_port_get_phys(struct tegra_pcie_port *port) +{ + struct device *dev = port->pcie->dev; + struct phy *phy; + unsigned int i; + int err; + + port->phys = devm_kcalloc(dev, sizeof(phy), port->lanes, GFP_KERNEL); + if (!port->phys) + return -ENOMEM; + + for (i = 0; i < port->lanes; i++) { + phy = devm_of_phy_optional_get_index(dev, port->np, "pcie", i); + if (IS_ERR(phy)) { + dev_err(dev, "failed to get PHY#%u: %ld\n", i, + PTR_ERR(phy)); + return PTR_ERR(phy); + } + + err = phy_init(phy); + if (err < 0) { + dev_err(dev, "failed to initialize PHY#%u: %d\n", i, + err); + return err; + } + + port->phys[i] = phy; + } + + return 0; +} + +static int tegra_pcie_phys_get(struct tegra_pcie *pcie) +{ + const struct tegra_pcie_soc_data *soc = pcie->soc_data; + struct device_node *np = pcie->dev->of_node; + struct tegra_pcie_port *port; + int err; + + if (!soc->has_gen2 || of_find_property(np, "phys", NULL) != NULL) + return tegra_pcie_phys_get_legacy(pcie); + + list_for_each_entry(port, &pcie->ports, list) { + err = tegra_pcie_port_get_phys(port); + if (err < 0) + return err; + } + + return 0; +} + static int tegra_pcie_get_resources(struct tegra_pcie *pcie) { struct platform_device *pdev = to_platform_device(pcie->dev); @@ -1067,16 +1283,9 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie) return err; } - pcie->phy = devm_phy_optional_get(pcie->dev, "pcie"); - if (IS_ERR(pcie->phy)) { - err = PTR_ERR(pcie->phy); - dev_err(&pdev->dev, "failed to get PHY: %d\n", err); - return err; - } - - err = phy_init(pcie->phy); + err = tegra_pcie_phys_get(pcie); if (err < 0) { - dev_err(&pdev->dev, "failed to initialize PHY: %d\n", err); + dev_err(&pdev->dev, "failed to get PHYs: %d\n", err); return err; } @@ -1752,6 +1961,7 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) rp->index = index; rp->lanes = value; rp->pcie = pcie; + rp->np = port; rp->base = devm_ioremap_resource(pcie->dev, &rp->regs); if (IS_ERR(rp->base)) |