PCI: tegra: Add Tegra186 PCIe support

Add Tegra186 PCIe support. UPHY programming is performed by BPMP; PHY
enable calls are not required for Tegra186 PCIe.

Power partition ungate is done by BPMP powergate driver. The Tegra186
DT description must include a "power-domains" property, which results in
dev->pm_domain being set.

Tested-by: Mikko Perttunen <[e-mail]>
Tested-by: Thierry Reding <[e-mail]>
Signed-off-by: Manikanta Maddireddy <[e-mail]>
[bhelgaas: add "power-domains" reference]
Signed-off-by: Bjorn Helgaas <[e-mail]>
Reviewed-by: Mikko Perttunen <[e-mail]>
Acked-by: Thierry Reding <[e-mail]>

drivers/pci/host/pci-tegra.c

···
 #define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE	(0x0 << 20)
 #define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420	(0x0 << 20)
 #define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1	(0x0 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_401	(0x0 << 20)
 #define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL	(0x1 << 20)
 #define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222	(0x1 << 20)
 #define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1	(0x1 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211	(0x1 << 20)
 #define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411	(0x2 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_111	(0x2 << 20)
 
 #define AFI_FUSE			0x104
 #define  AFI_FUSE_PCIE_T0_GEN2_DIS	(1 << 2)
···
 	bool has_cml_clk;
 	bool has_gen2;
 	bool force_pca_enable;
+	bool program_uphy;
 };
 
 static inline struct tegra_msi *to_tegra_msi(struct msi_controller *chip)
···
 		afi_writel(pcie, value, AFI_FUSE);
 	}
 
-	err = tegra_pcie_phy_power_on(pcie);
-	if (err < 0) {
-		dev_err(dev, "failed to power on PHY(s): %d\n", err);
-		return err;
+	if (soc->program_uphy) {
+		err = tegra_pcie_phy_power_on(pcie);
+		if (err < 0) {
+			dev_err(dev, "failed to power on PHY(s): %d\n", err);
+			return err;
+		}
 	}
 
 	/* take the PCIe interface module out of reset */
···
 static void tegra_pcie_power_off(struct tegra_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
+	const struct tegra_pcie_soc *soc = pcie->soc;
 	int err;
 
 	/* TODO: disable and unprepare clocks? */
 
-	err = tegra_pcie_phy_power_off(pcie);
-	if (err < 0)
-		dev_err(dev, "failed to power off PHY(s): %d\n", err);
+	if (soc->program_uphy) {
+		err = tegra_pcie_phy_power_off(pcie);
+		if (err < 0)
+			dev_err(dev, "failed to power off PHY(s): %d\n", err);
+	}
 
 	reset_control_assert(pcie->pcie_xrst);
 	reset_control_assert(pcie->afi_rst);
 	reset_control_assert(pcie->pex_rst);
 
-	tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
+	if (!dev->pm_domain)
+		tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
 
 	err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
 	if (err < 0)
···
 	reset_control_assert(pcie->afi_rst);
 	reset_control_assert(pcie->pex_rst);
 
-	tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
+	if (!dev->pm_domain)
+		tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
 
 	/* enable regulators */
 	err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
 	if (err < 0)
 		dev_err(dev, "failed to enable regulators: %d\n", err);
 
-	err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
-						pcie->pex_clk,
-						pcie->pex_rst);
-	if (err) {
-		dev_err(dev, "powerup sequence failed: %d\n", err);
-		return err;
+	if (dev->pm_domain) {
+		err = clk_prepare_enable(pcie->pex_clk);
+		if (err) {
+			dev_err(dev, "failed to enable PEX clock: %d\n", err);
+			return err;
+		}
+		reset_control_deassert(pcie->pex_rst);
+	} else {
+		err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
+							pcie->pex_clk,
+							pcie->pex_rst);
+		if (err) {
+			dev_err(dev, "powerup sequence failed: %d\n", err);
+			return err;
+		}
 	}
 
 	reset_control_deassert(pcie->afi_rst);
···
 	struct device *dev = pcie->dev;
 	struct platform_device *pdev = to_platform_device(dev);
 	struct resource *pads, *afi, *res;
+	const struct tegra_pcie_soc *soc = pcie->soc;
 	int err;
 
 	err = tegra_pcie_clocks_get(pcie);
···
 		return err;
 	}
 
-	err = tegra_pcie_phys_get(pcie);
-	if (err < 0) {
-		dev_err(dev, "failed to get PHYs: %d\n", err);
-		return err;
+	if (soc->program_uphy) {
+		err = tegra_pcie_phys_get(pcie);
+		if (err < 0) {
+			dev_err(dev, "failed to get PHYs: %d\n", err);
+			return err;
+		}
 	}
 
 	err = tegra_pcie_power_on(pcie);
···
 static int tegra_pcie_put_resources(struct tegra_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
+	const struct tegra_pcie_soc *soc = pcie->soc;
 	int err;
 
 	if (pcie->irq > 0)
···
 
 	tegra_pcie_power_off(pcie);
 
-	err = phy_exit(pcie->phy);
-	if (err < 0)
-		dev_err(dev, "failed to teardown PHY: %d\n", err);
+	if (soc->program_uphy) {
+		err = phy_exit(pcie->phy);
+		if (err < 0)
+			dev_err(dev, "failed to teardown PHY: %d\n", err);
+	}
 
 	return 0;
 }
···
 	struct device *dev = pcie->dev;
 	struct device_node *np = dev->of_node;
 
-	if (of_device_is_compatible(np, "nvidia,tegra124-pcie") ||
-	    of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
+	if (of_device_is_compatible(np, "nvidia,tegra186-pcie")) {
+		switch (lanes) {
+		case 0x010004:
+			dev_info(dev, "4x1, 1x1 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_401;
+			return 0;
+
+		case 0x010102:
+			dev_info(dev, "2x1, 1X1, 1x1 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211;
+			return 0;
+
+		case 0x010101:
+			dev_info(dev, "1x1, 1x1, 1x1 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_111;
+			return 0;
+
+		default:
+			dev_info(dev, "wrong configuration updated in DT, "
+				 "switching to default 2x1, 1x1, 1x1 "
+				 "configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_211;
+			return 0;
+		}
+	} else if (of_device_is_compatible(np, "nvidia,tegra124-pcie") ||
+		   of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
 		switch (lanes) {
 		case 0x0000104:
 			dev_info(dev, "4x1, 1x1 configuration\n");
···
 	struct device_node *np = dev->of_node;
 	unsigned int i = 0;
 
-	if (of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
+	if (of_device_is_compatible(np, "nvidia,tegra186-pcie")) {
+		pcie->num_supplies = 4;
+
+		pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+					      sizeof(*pcie->supplies),
+					      GFP_KERNEL);
+		if (!pcie->supplies)
+			return -ENOMEM;
+
+		pcie->supplies[i++].supply = "dvdd-pex";
+		pcie->supplies[i++].supply = "hvdd-pex-pll";
+		pcie->supplies[i++].supply = "hvdd-pex";
+		pcie->supplies[i++].supply = "vddio-pexctl-aud";
+	} else if (of_device_is_compatible(np, "nvidia,tegra210-pcie")) {
 		pcie->num_supplies = 6;
 
 		pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
···
 	.has_cml_clk = false,
 	.has_gen2 = false,
 	.force_pca_enable = false,
+	.program_uphy = true,
 };
 
 static const struct tegra_pcie_soc tegra30_pcie = {
···
 	.has_cml_clk = true,
 	.has_gen2 = false,
 	.force_pca_enable = false,
+	.program_uphy = true,
 };
 
 static const struct tegra_pcie_soc tegra124_pcie = {
···
 	.has_cml_clk = true,
 	.has_gen2 = true,
 	.force_pca_enable = false,
+	.program_uphy = true,
 };
 
 static const struct tegra_pcie_soc tegra210_pcie = {
···
 	.has_cml_clk = true,
 	.has_gen2 = true,
 	.force_pca_enable = true,
+	.program_uphy = true,
+};
+
+static const struct tegra_pcie_soc tegra186_pcie = {
+	.num_ports = 3,
+	.msi_base_shift = 8,
+	.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
+	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+	.pads_refclk_cfg0 = 0x80b880b8,
+	.pads_refclk_cfg1 = 0x000480b8,
+	.has_pex_clkreq_en = true,
+	.has_pex_bias_ctrl = true,
+	.has_intr_prsnt_sense = true,
+	.has_cml_clk = false,
+	.has_gen2 = true,
+	.force_pca_enable = false,
+	.program_uphy = false,
 };
 
 static const struct of_device_id tegra_pcie_of_match[] = {
+	{ .compatible = "nvidia,tegra186-pcie", .data = &tegra186_pcie },
 	{ .compatible = "nvidia,tegra210-pcie", .data = &tegra210_pcie },
 	{ .compatible = "nvidia,tegra124-pcie", .data = &tegra124_pcie },
 	{ .compatible = "nvidia,tegra30-pcie", .data = &tegra30_pcie },