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From:   Richard Zhu <hongxing.zhu@nxp.com>
To:     l.stach@pengutronix.de, bhelgaas@google.com, robh+dt@kernel.org,
        lorenzo.pieralisi@arm.com, shawnguo@kernel.org, kishon@ti.com,
        kw@linux.com, frank.li@nxp.com
Cc:     hongxing.zhu@nxp.com, linux-pci@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, kernel@pengutronix.de,
        linux-imx@nxp.com
Subject: [PATCH v3 13/14] PCI: imx6: Add iMX8MQ PCIe EP support
Date:   Fri, 23 Sep 2022 14:06:59 +0800
Message-Id: <1663913220-9523-14-git-send-email-hongxing.zhu@nxp.com>
In-Reply-To: <1663913220-9523-1-git-send-email-hongxing.zhu@nxp.com>
References: <1663913220-9523-1-git-send-email-hongxing.zhu@nxp.com>
Precedence: bulk

Add the iMX8MQ PCIe EP support

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 36 +++++++++++++++++++++++----
 1 file changed, 31 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 1044b0726405..931243e36252 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -53,6 +53,7 @@ enum imx6_pcie_variants {
 	IMX8MM,
 	IMX8MP,
 	IMX8MM_EP,
+	IMX8MQ_EP,
 };
 
 #define IMX6_PCIE_FLAG_IMX6_PHY			BIT(0)
@@ -154,6 +155,7 @@ struct 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 != IMX8MQ_EP &&
 		imx6_pcie->drvdata->variant != IMX8MM &&
 		imx6_pcie->drvdata->variant != IMX8MM_EP &&
 		imx6_pcie->drvdata->variant != IMX8MP);
@@ -169,13 +171,22 @@ static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
 	else
 		mode = PCI_EXP_TYPE_ROOT_PORT;
 
-	if (imx6_pcie->drvdata->variant == IMX8MQ &&
-	    imx6_pcie->controller_id == 1) {
-		mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
-		val  = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE, mode);
-	} else {
+	switch (imx6_pcie->drvdata->variant) {
+	case IMX8MQ:
+	case IMX8MQ_EP:
+		if (imx6_pcie->controller_id == 1) {
+			mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
+			val  = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
+					  mode);
+		} else {
+			mask = IMX6Q_GPR12_DEVICE_TYPE;
+			val  = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
+		}
+		break;
+	default:
 		mask = IMX6Q_GPR12_DEVICE_TYPE;
 		val  = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE, mode);
+		break;
 	}
 
 	regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, mask, val);
@@ -318,6 +329,7 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
 		 */
 		break;
 	case IMX8MQ:
+	case IMX8MQ_EP:
 		/*
 		 * TODO: Currently this code assumes external
 		 * oscillator is being used
@@ -570,6 +582,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 	case IMX8MM:
 	case IMX8MM_EP:
 	case IMX8MQ:
+	case IMX8MQ_EP:
 	case IMX8MP:
 		ret = clk_prepare_enable(imx6_pcie->pcie_aux);
 		if (ret) {
@@ -616,6 +629,7 @@ static void imx6_pcie_disable_ref_clk(struct imx6_pcie *imx6_pcie)
 	case IMX8MM:
 	case IMX8MM_EP:
 	case IMX8MQ:
+	case IMX8MQ_EP:
 	case IMX8MP:
 		clk_disable_unprepare(imx6_pcie->pcie_aux);
 		break;
@@ -681,6 +695,7 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX7D:
 	case IMX8MQ:
+	case IMX8MQ_EP:
 		reset_control_assert(imx6_pcie->pciephy_reset);
 		fallthrough;
 	case IMX8MM:
@@ -723,6 +738,7 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX8MQ:
+	case IMX8MQ_EP:
 		reset_control_deassert(imx6_pcie->pciephy_reset);
 		break;
 	case IMX7D:
@@ -811,6 +827,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
 		break;
 	case IMX7D:
 	case IMX8MQ:
+	case IMX8MQ_EP:
 	case IMX8MM:
 	case IMX8MM_EP:
 	case IMX8MP:
@@ -832,6 +849,7 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
 		break;
 	case IMX7D:
 	case IMX8MQ:
+	case IMX8MQ_EP:
 	case IMX8MM:
 	case IMX8MM_EP:
 	case IMX8MP:
@@ -1085,6 +1103,7 @@ static int imx6_add_pcie_ep(struct imx6_pcie *imx6_pcie,
 
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX8MM_EP:
+	case IMX8MQ_EP:
 		pcie_dbi2_offset = SZ_1M;
 		break;
 	default:
@@ -1272,6 +1291,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
 					     "pcie_inbound_axi clock missing or invalid\n");
 		break;
 	case IMX8MQ:
+	case IMX8MQ_EP:
 		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),
@@ -1462,6 +1482,11 @@ static const struct imx6_pcie_drvdata drvdata[] = {
 		.mode = DW_PCIE_EP_TYPE,
 		.gpr = "fsl,imx8mm-iomuxc-gpr",
 	},
+	[IMX8MQ_EP] = {
+		.variant = IMX8MQ_EP,
+		.mode = DW_PCIE_EP_TYPE,
+		.gpr = "fsl,imx8mq-iomuxc-gpr",
+	},
 };
 
 static const struct of_device_id imx6_pcie_of_match[] = {
@@ -1473,6 +1498,7 @@ static const struct of_device_id imx6_pcie_of_match[] = {
 	{ .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
 	{ .compatible = "fsl,imx8mp-pcie", .data = &drvdata[IMX8MP], },
 	{ .compatible = "fsl,imx8mm-pcie-ep", .data = &drvdata[IMX8MM_EP], },
+	{ .compatible = "fsl,imx8mq-pcie-ep", .data = &drvdata[IMX8MQ_EP], },
 	{},
 };
 
-- 
2.25.1