linux-kernel - [RFC 7/7] PCI: imx6: Add the iMX8MP PCIe support

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Message-Id: <1646633676-23535-8-git-send-email-hongxing.zhu@nxp.com>
Date:   Mon,  7 Mar 2022 14:14:36 +0800
From:   Richard Zhu <hongxing.zhu@....com>
To:     p.zabel@...gutronix.de, l.stach@...gutronix.de,
        bhelgaas@...gle.com, lorenzo.pieralisi@....com, robh@...nel.org,
        shawnguo@...nel.org
Cc:     devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, linux-imx@....com,
        Richard Zhu <hongxing.zhu@....com>
Subject: [RFC 7/7] PCI: imx6: Add the iMX8MP PCIe support

Add the i.MX8MP PCIe support.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index bb662f90d4f3..fcf7638d5071 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -51,6 +51,7 @@ enum imx6_pcie_variants {
 	IMX7D,
 	IMX8MQ,
 	IMX8MM,
+	IMX8MP,
 };
 
 #define IMX6_PCIE_FLAG_IMX6_PHY			BIT(0)
@@ -379,6 +380,7 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
 		reset_control_assert(imx6_pcie->pciephy_reset);
 		fallthrough;
 	case IMX8MM:
+	case IMX8MP:
 		reset_control_assert(imx6_pcie->apps_reset);
 		break;
 	case IMX6SX:
@@ -407,7 +409,8 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
 static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
 {
 	WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ &&
-		imx6_pcie->drvdata->variant != IMX8MM);
+		imx6_pcie->drvdata->variant != IMX8MM &&
+		imx6_pcie->drvdata->variant != IMX8MP);
 	return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14;
 }
 
@@ -448,6 +451,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 		break;
 	case IMX8MM:
 	case IMX8MQ:
+	case IMX8MP:
 		ret = clk_prepare_enable(imx6_pcie->pcie_aux);
 		if (ret) {
 			dev_err(dev, "unable to enable pcie_aux clock\n");
@@ -503,6 +507,7 @@ static int imx6_pcie_clk_enable(struct imx6_pcie *imx6_pcie)
 
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX8MM:
+	case IMX8MP:
 		if (phy_power_on(imx6_pcie->phy))
 			dev_err(dev, "unable to power on PHY\n");
 		break;
@@ -603,8 +608,10 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 		reset_control_deassert(imx6_pcie->pciephy_reset);
 		break;
 	case IMX8MM:
+	case IMX8MP:
 		if (phy_init(imx6_pcie->phy))
 			dev_err(dev, "waiting for phy ready timeout!\n");
+		return -ENODEV;
 		break;
 	case IMX7D:
 		reset_control_deassert(imx6_pcie->pciephy_reset);
@@ -678,6 +685,7 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
 {
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX8MM:
+	case IMX8MP:
 		/*
 		 * The PHY initialization had been done in the PHY
 		 * driver, break here directly.
@@ -823,6 +831,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
 	case IMX7D:
 	case IMX8MQ:
 	case IMX8MM:
+	case IMX8MP:
 		reset_control_deassert(imx6_pcie->apps_reset);
 		break;
 	}
@@ -938,6 +947,7 @@ static void imx6_pcie_host_exit(struct pcie_port *pp)
 		imx6_pcie_clk_disable(imx6_pcie);
 		switch (imx6_pcie->drvdata->variant) {
 		case IMX8MM:
+		case IMX8MP:
 			if (phy_power_off(imx6_pcie->phy))
 				dev_err(dev, "unable to power off phy\n");
 			phy_exit(imx6_pcie->phy);
@@ -972,6 +982,7 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
 		break;
 	case IMX7D:
 	case IMX8MM:
+	case IMX8MP:
 		reset_control_assert(imx6_pcie->apps_reset);
 		break;
 	default:
@@ -1028,6 +1039,7 @@ static int imx6_pcie_suspend_noirq(struct device *dev)
 	imx6_pcie_clk_disable(imx6_pcie);
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX8MM:
+	case IMX8MP:
 		if (phy_power_off(imx6_pcie->phy))
 			dev_err(dev, "unable to power off PHY\n");
 		phy_exit(imx6_pcie->phy);
@@ -1177,6 +1189,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
 		}
 		break;
 	case IMX8MM:
+	case IMX8MP:
 		imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
 		if (IS_ERR(imx6_pcie->pcie_aux))
 			return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
@@ -1327,6 +1340,10 @@ static const struct imx6_pcie_drvdata drvdata[] = {
 		.variant = IMX8MM,
 		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
 	},
+	[IMX8MP] = {
+		.variant = IMX8MP,
+		.flags = IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
+	},
 };
 
 static const struct of_device_id imx6_pcie_of_match[] = {
@@ -1336,6 +1353,7 @@ static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx7d-pcie",  .data = &drvdata[IMX7D],  },
 	{ .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], },
 	{ .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
+	{ .compatible = "fsl,imx8mp-pcie", .data = &drvdata[IMX8MP], },
 	{},
 };
 
-- 
2.25.1