Message-Id: <1693291534-32092-4-git-send-email-hongxing.zhu@nxp.com>
Date:   Tue, 29 Aug 2023 14:45:34 +0800
From:   Richard Zhu <hongxing.zhu@....com>
To:     vkoul@...nel.org, kishon@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
        l.stach@...gutronix.de, a.fatoum@...gutronix.de,
        u.kleine-koenig@...gutronix.de
Cc:     hongxing.zhu@....com, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        linux-imx@....com
Subject: [PATCH v1 3/3] phy: freescale: imx8q-pcie: Add i.MX8Q PCIe PHY driver

i.MX8QM HSIO(High Speed IO) module has three instances of single lane
SERDES PHYs, an instance of two lanes PCIe GEN3 controller, an
instance of single lane PCIe GEN3 controller, as well as an instance
of SATA 3.0 controller.

The HSIO module can be configured as the following different usecases.
1 - A two lanes PCIea and a single lane SATA.
2 - A single lane PCIea, a single lane PCIeb and a single lane SATA.
3 - A two lanes PCIea, a single lane PCIeb.

Add i.MX8Q PCIe PHY driver to support these different usecases.
- Add the runtime PM support, thus the PCIe PHY PD can be turned off
  when PCIe probe is failed.
- The APB_PCLK is required only when PHY is configured as PCIE mode.

Note:
Although the RM document doesn't specify it, but the LPCG clocks should
be handled by a different procedure when the PHY is configured in PCIe
or SATA modes based on the practical oberservations.
When PHY is configured into PCIe mode.
- apb_pclk is mandatory required.
- apb_pclk and pipe_pclk should be enabled just before polling
  PM_REQ_CORE_RST is cleared or not.
When PHY is configured as SATA mode.
- There is no apb_pclk.
- pipe_pclk should be enabled together with other LPCG clocks.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 drivers/phy/freescale/Kconfig              |   8 +
 drivers/phy/freescale/Makefile             |   1 +
 drivers/phy/freescale/phy-fsl-imx8q-pcie.c | 562 +++++++++++++++++++++
 3 files changed, 571 insertions(+)
 create mode 100644 drivers/phy/freescale/phy-fsl-imx8q-pcie.c

diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig
index 853958fb2c06..6f81fbf5f5e6 100644
--- a/drivers/phy/freescale/Kconfig
+++ b/drivers/phy/freescale/Kconfig
@@ -35,6 +35,14 @@ config PHY_FSL_IMX8M_PCIE
 	  Enable this to add support for the PCIE PHY as found on
 	  i.MX8M family of SOCs.
 
+config PHY_FSL_IMX8Q_PCIE
+	tristate "Freescale i.MX8Q PCIE PHY"
+	depends on OF && HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to add support for the PCIE PHY as found on
+	  i.MX8Q family of SOCs.
+
 endif
 
 config PHY_FSL_LYNX_28G
diff --git a/drivers/phy/freescale/Makefile b/drivers/phy/freescale/Makefile
index cedb328bc4d2..afa84807c40c 100644
--- a/drivers/phy/freescale/Makefile
+++ b/drivers/phy/freescale/Makefile
@@ -3,4 +3,5 @@ obj-$(CONFIG_PHY_FSL_IMX8MQ_USB)	+= phy-fsl-imx8mq-usb.o
 obj-$(CONFIG_PHY_MIXEL_LVDS_PHY)	+= phy-fsl-imx8qm-lvds-phy.o
 obj-$(CONFIG_PHY_MIXEL_MIPI_DPHY)	+= phy-fsl-imx8-mipi-dphy.o
 obj-$(CONFIG_PHY_FSL_IMX8M_PCIE)	+= phy-fsl-imx8m-pcie.o
+obj-$(CONFIG_PHY_FSL_IMX8Q_PCIE)	+= phy-fsl-imx8q-pcie.o
 obj-$(CONFIG_PHY_FSL_LYNX_28G)		+= phy-fsl-lynx-28g.o
diff --git a/drivers/phy/freescale/phy-fsl-imx8q-pcie.c b/drivers/phy/freescale/phy-fsl-imx8q-pcie.c
new file mode 100644
index 000000000000..3f1589628be1
--- /dev/null
+++ b/drivers/phy/freescale/phy-fsl-imx8q-pcie.c
@@ -0,0 +1,562 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2023 NXP
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#include <dt-bindings/phy/phy-imx8-pcie.h>
+
+/* i.MX8Q HSIO registers */
+#define IMX8Q_PHY_CTRL0_OFFSET			0x0
+#define IMX8Q_PHYX2_CTRL0_APB_MASK		GENMASK(1, 0)
+#define IMX8Q_PHY_CTRL0_APB_RSTN_0		BIT(0)
+#define IMX8Q_PHY_CTRL0_APB_RSTN_1		BIT(1)
+#define IMX8Q_PHY_MODE_MASK			GENMASK(20, 17)
+#define IMX8Q_PHY_MODE_SATA			BIT(19)
+#define IMX8Q_PHY_PIPE_RSTN_0_MASK		GENMASK(25, 24)
+#define IMX8Q_PHY_PIPE_RSTN_1_MASK		GENMASK(27, 26)
+
+#define IMX8Q_PHY_STTS0_OFFSET			0x4
+#define IMX8Q_STTS0_LANE0_TX_PLL_LOCK		BIT(4)
+#define IMX8Q_STTS0_LANE1_TX_PLL_LOCK		BIT(12)
+
+#define IMX8Q_PCIE_CTRL2_OFFSET			0x8
+#define IMX8Q_CTRL_BUTTON_RST_N			BIT(21)
+#define IMX8Q_CTRL_PERST_N			BIT(22)
+#define IMX8Q_CTRL_POWER_UP_RST_N		BIT(23)
+
+#define IMX8Q_PCIE_STTS0_OFFSET			0xC
+#define IMX8Q_CTRL_STTS0_PM_REQ_CORE_RST	BIT(19)
+
+#define IMX8Q_SATA_CTRL0_OFFSET			0x0
+#define IMX8Q_SATA_CTRL_EPCS_TXDEEMP		BIT(5)
+#define IMX8Q_SATA_CTRL_EPCS_TXDEEMP_SEL	BIT(6)
+#define IMX8Q_SATA_CTRL_EPCS_PHYRESET_N		BIT(7)
+#define IMX8Q_SATA_CTRL_RESET_N			BIT(12)
+
+#define IMX8Q_MISC_CTRL0_OFFSET			0x0
+#define IMX8Q_MISC_IOB_RXENA			BIT(0)
+#define IMX8Q_MISC_IOB_TXENA			BIT(1)
+#define IMX8Q_MISC_IOB_A_0_TXOE			BIT(2)
+#define IMX8Q_MISC_IOB_A_0_M1M0_MASK		GENMASK(4, 3)
+#define IMX8Q_MISC_IOB_A_0_M1M0_2		BIT(4)
+#define IMX8Q_MISC_PHYX1_EPCS_SEL		BIT(12)
+#define IMX8Q_MISC_PCIE_AB_SELECT		BIT(13)
+#define IMX8Q_MISC_CLKREQN_OUT_OVERRIDE_1	BIT(24)
+#define IMX8Q_MISC_CLKREQN_OUT_OVERRIDE_0	BIT(25)
+
+#define IMX8Q_PHY_REG48_PMA_STATUS		0x30
+#define IMX8Q_PHY_REG48_PMA_RDY			BIT(7)
+
+#define IMX8Q_PHYX2_LANE1_BASE_ADDR		0x5F190000
+#define IMX8Q_PHYX1_LANE0_BASE_ADDR		0x5F1A0000
+
+/* Parameters for the waiting for PCIe PHY PLL to lock */
+#define PHY_INIT_WAIT_USLEEP_MAX	10
+#define PHY_INIT_WAIT_TIMEOUT		(1000 * PHY_INIT_WAIT_USLEEP_MAX)
+
+enum imx8q_pcie_phy_mode {
+	IMX8Q_PHY_PCIE_MODE,
+	IMX8Q_PHY_SATA_MODE,
+};
+
+struct imx8q_pcie_phy {
+	void __iomem		*base;
+	struct clk		*apb_pclk;
+	struct clk		*ctrl_ips_clk;
+	struct clk		*misc_ips_clk;
+	struct clk		*phy_ips_clk;
+	struct clk		*pipe_pclk;
+	struct device		*dev;
+	struct phy		*phy;
+	struct regmap		*ctrl_gpr;
+	struct regmap		*misc_gpr;
+	struct regmap		*phy_gpr;
+	u32			hsio_cfg;
+	u32			lane_id;
+	u32			refclk_pad_mode;
+	enum			imx8q_pcie_phy_mode mode;
+};
+
+static int imx8q_pcie_phy_init(struct phy *phy)
+{
+	int ret;
+	struct imx8q_pcie_phy *imx8_phy = phy_get_drvdata(phy);
+
+	if (imx8_phy->mode == IMX8Q_PHY_SATA_MODE) {
+		ret = clk_prepare_enable(imx8_phy->pipe_pclk);
+		if (ret) {
+			dev_err(imx8_phy->dev, "can't enable pipe clock\n");
+			return ret;
+		}
+	}
+
+	ret = clk_prepare_enable(imx8_phy->ctrl_ips_clk);
+	if (ret) {
+		dev_err(imx8_phy->dev, "can't enable ctrl_ips clock\n");
+		goto err_ctrl_ips_clk;
+	}
+
+	ret = clk_prepare_enable(imx8_phy->phy_ips_clk);
+	if (ret) {
+		dev_err(imx8_phy->dev, "can't enable phy_ips clock\n");
+		goto err_phy_ips_clk;
+	}
+
+	ret = clk_prepare_enable(imx8_phy->misc_ips_clk);
+	if (ret) {
+		dev_err(imx8_phy->dev, "can't enable misc_ips clock\n");
+		goto err_misc_ips_clk;
+	}
+
+	/* allow the clocks to stabilize */
+	usleep_range(200, 500);
+
+	return ret;
+
+err_misc_ips_clk:
+	clk_disable_unprepare(imx8_phy->phy_ips_clk);
+err_phy_ips_clk:
+	clk_disable_unprepare(imx8_phy->ctrl_ips_clk);
+err_ctrl_ips_clk:
+	if (imx8_phy->mode == IMX8Q_PHY_SATA_MODE)
+		clk_disable_unprepare(imx8_phy->pipe_pclk);
+
+	return ret;
+}
+
+static int imx8q_pcie_phy_exit(struct phy *phy)
+{
+	struct imx8q_pcie_phy *imx8_phy = phy_get_drvdata(phy);
+
+	clk_disable_unprepare(imx8_phy->misc_ips_clk);
+	clk_disable_unprepare(imx8_phy->phy_ips_clk);
+	clk_disable_unprepare(imx8_phy->ctrl_ips_clk);
+	if (imx8_phy->mode == IMX8Q_PHY_SATA_MODE)
+		clk_disable_unprepare(imx8_phy->pipe_pclk);
+
+	return 0;
+}
+
+static void imx8q_pcie_phy_reset_pcie(struct phy *phy)
+{
+	struct imx8q_pcie_phy *imx8_phy = phy_get_drvdata(phy);
+
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_PCIE_CTRL2_OFFSET,
+			IMX8Q_CTRL_BUTTON_RST_N, 0);
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_PCIE_CTRL2_OFFSET,
+			IMX8Q_CTRL_PERST_N, 0);
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_PCIE_CTRL2_OFFSET,
+			IMX8Q_CTRL_POWER_UP_RST_N, 0);
+	mdelay(1);
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_PCIE_CTRL2_OFFSET,
+			IMX8Q_CTRL_BUTTON_RST_N, IMX8Q_CTRL_BUTTON_RST_N);
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_PCIE_CTRL2_OFFSET,
+			IMX8Q_CTRL_PERST_N, IMX8Q_CTRL_PERST_N);
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_PCIE_CTRL2_OFFSET,
+			IMX8Q_CTRL_POWER_UP_RST_N, IMX8Q_CTRL_POWER_UP_RST_N);
+}
+
+static void imx8q_pcie_phy_set_clock_mode(struct phy *phy)
+{
+	u32 pad_mode;
+	struct imx8q_pcie_phy *imx8_phy = phy_get_drvdata(phy);
+
+	pad_mode = imx8_phy->refclk_pad_mode;
+	if (pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT ||
+	    pad_mode == IMX8_PCIE_REFCLK_PAD_UNUSED) {
+		/* Configure the PAD as input mode */
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_IOB_RXENA, IMX8Q_MISC_IOB_RXENA);
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_IOB_TXENA, 0);
+		usleep_range(200, 500);
+	} else {
+		/* Configure the PHY to output the refclock via PAD */
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_IOB_RXENA, 0);
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_IOB_TXENA, IMX8Q_MISC_IOB_TXENA);
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_IOB_A_0_TXOE | IMX8Q_MISC_IOB_A_0_M1M0_MASK,
+			IMX8Q_MISC_IOB_A_0_TXOE | IMX8Q_MISC_IOB_A_0_M1M0_2);
+	}
+}
+
+static void imx8q_pcie_phy_reset_sata(struct phy *phy)
+{
+	struct imx8q_pcie_phy *imx8_phy = phy_get_drvdata(phy);
+
+	/* clear PHY RST, then set it */
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_SATA_CTRL0_OFFSET,
+			IMX8Q_SATA_CTRL_EPCS_PHYRESET_N, 0);
+
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_SATA_CTRL0_OFFSET,
+			IMX8Q_SATA_CTRL_EPCS_PHYRESET_N,
+			IMX8Q_SATA_CTRL_EPCS_PHYRESET_N);
+
+	/* CTRL RST: SET -> delay 1 us -> CLEAR -> SET */
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_SATA_CTRL0_OFFSET,
+			IMX8Q_SATA_CTRL_RESET_N, IMX8Q_SATA_CTRL_RESET_N);
+	udelay(1);
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_SATA_CTRL0_OFFSET,
+			IMX8Q_SATA_CTRL_RESET_N, 0);
+	regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_SATA_CTRL0_OFFSET,
+			IMX8Q_SATA_CTRL_RESET_N, IMX8Q_SATA_CTRL_RESET_N);
+
+	usleep_range(50, 100);
+}
+
+static int imx8q_pcie_phy_power_on(struct phy *phy)
+{
+	int ret;
+	u32 val, cond;
+	struct imx8q_pcie_phy *imx8_phy = phy_get_drvdata(phy);
+
+	if (imx8_phy->mode == IMX8Q_PHY_SATA_MODE) {
+		/* SATA mode PHY */
+		regmap_update_bits(imx8_phy->phy_gpr, IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_MODE_MASK, IMX8Q_PHY_MODE_SATA);
+		/*
+		 * It is possible, for PCIe and SATA are sharing
+		 * the same clock source, HPLL or external oscillator.
+		 * When PCIe is in low power modes (L1.X or L2 etc),
+		 * the clock source can be turned off. In this case,
+		 * if this clock source is required to be toggling by
+		 * SATA, then SATA functions will be abnormal.
+		 * Set the override here to avoid it.
+		 */
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+				IMX8Q_MISC_CLKREQN_OUT_OVERRIDE_1 |
+				IMX8Q_MISC_CLKREQN_OUT_OVERRIDE_0,
+				IMX8Q_MISC_CLKREQN_OUT_OVERRIDE_1 |
+				IMX8Q_MISC_CLKREQN_OUT_OVERRIDE_0);
+	} else {
+		/* PCIe mode PHY */
+		imx8q_pcie_phy_reset_pcie(phy);
+	}
+
+	if (imx8_phy->hsio_cfg == PCIEAX2SATA) {
+		if (imx8_phy->lane_id == 0) {
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHYX2_CTRL0_APB_MASK,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0 |
+				IMX8Q_PHY_CTRL0_APB_RSTN_1);
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK |
+				IMX8Q_PHY_PIPE_RSTN_1_MASK,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK |
+				IMX8Q_PHY_PIPE_RSTN_1_MASK);
+		} else if (imx8_phy->lane_id == 2) {
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0);
+		}
+
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_PHYX1_EPCS_SEL, IMX8Q_MISC_PHYX1_EPCS_SEL);
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_PCIE_AB_SELECT, 0);
+	} else if (imx8_phy->hsio_cfg == PCIEAX1PCIEBX1SATA) {
+		if (imx8_phy->lane_id == 0) {
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0);
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK);
+		} else if (imx8_phy->lane_id == 1) {
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_CTRL0_APB_RSTN_1,
+				IMX8Q_PHY_CTRL0_APB_RSTN_1);
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_PIPE_RSTN_1_MASK,
+				IMX8Q_PHY_PIPE_RSTN_1_MASK);
+		} else if (imx8_phy->lane_id == 2) {
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0);
+		}
+
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_PCIE_AB_SELECT, IMX8Q_MISC_PCIE_AB_SELECT);
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_PHYX1_EPCS_SEL, IMX8Q_MISC_PHYX1_EPCS_SEL);
+	} else if (imx8_phy->hsio_cfg == PCIEAX2PCIEBX1) {
+		if (imx8_phy->lane_id == 0) {
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHYX2_CTRL0_APB_MASK,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0 |
+				IMX8Q_PHY_CTRL0_APB_RSTN_1);
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK |
+				IMX8Q_PHY_PIPE_RSTN_1_MASK,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK |
+				IMX8Q_PHY_PIPE_RSTN_1_MASK);
+		} else if (imx8_phy->lane_id == 2) {
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0,
+				IMX8Q_PHY_CTRL0_APB_RSTN_0);
+			regmap_update_bits(imx8_phy->phy_gpr,
+				IMX8Q_PHY_CTRL0_OFFSET,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK,
+				IMX8Q_PHY_PIPE_RSTN_0_MASK);
+		}
+
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_PHYX1_EPCS_SEL, 0);
+		regmap_update_bits(imx8_phy->misc_gpr, IMX8Q_MISC_CTRL0_OFFSET,
+			IMX8Q_MISC_PCIE_AB_SELECT, IMX8Q_MISC_PCIE_AB_SELECT);
+	}
+
+	imx8q_pcie_phy_set_clock_mode(phy);
+
+	if (imx8_phy->mode == IMX8Q_PHY_SATA_MODE) {
+		regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_SATA_CTRL0_OFFSET,
+				IMX8Q_SATA_CTRL_EPCS_TXDEEMP,
+				IMX8Q_SATA_CTRL_EPCS_TXDEEMP);
+		regmap_update_bits(imx8_phy->ctrl_gpr, IMX8Q_SATA_CTRL0_OFFSET,
+				IMX8Q_SATA_CTRL_EPCS_TXDEEMP_SEL,
+				IMX8Q_SATA_CTRL_EPCS_TXDEEMP_SEL);
+
+		imx8q_pcie_phy_reset_sata(phy);
+	} else {
+		ret = clk_prepare_enable(imx8_phy->apb_pclk);
+		if (ret) {
+			dev_err(imx8_phy->dev, "can't enable apb_pclk clock\n");
+			return ret;
+		}
+		ret = clk_prepare_enable(imx8_phy->pipe_pclk);
+		if (ret) {
+			dev_err(imx8_phy->dev, "can't enable pipe_pclk clock\n");
+			clk_disable_unprepare(imx8_phy->apb_pclk);
+			return ret;
+		}
+
+		/* Bit19 PM_REQ_CORE_RST of PCIe_STTS0 should be cleared. */
+		ret = regmap_read_poll_timeout(imx8_phy->ctrl_gpr,
+				IMX8Q_PCIE_STTS0_OFFSET, val,
+				(val & IMX8Q_CTRL_STTS0_PM_REQ_CORE_RST) == 0,
+				PHY_INIT_WAIT_USLEEP_MAX,
+				PHY_INIT_WAIT_TIMEOUT);
+		if (ret) {
+			dev_err(imx8_phy->dev, "PM_REQ_CORE_RST is set\n");
+			goto err_exit;
+		}
+	}
+
+	/* Polling to check the PHY is ready or not. */
+	if (imx8_phy->lane_id == 1)
+		cond = IMX8Q_STTS0_LANE1_TX_PLL_LOCK;
+	else
+		cond = IMX8Q_STTS0_LANE0_TX_PLL_LOCK;
+
+	ret = regmap_read_poll_timeout(imx8_phy->phy_gpr,
+			IMX8Q_PHY_STTS0_OFFSET, val, ((val & cond) == cond),
+			PHY_INIT_WAIT_USLEEP_MAX, PHY_INIT_WAIT_TIMEOUT);
+	if (ret) {
+		dev_err(imx8_phy->dev, "PHY PLL lock timeout\n");
+		goto err_exit;
+	} else {
+		dev_info(imx8_phy->dev, "PHY PLL is locked\n");
+	}
+
+	if (imx8_phy->mode == IMX8Q_PHY_SATA_MODE) {
+		cond = IMX8Q_PHY_REG48_PMA_RDY;
+		ret = read_poll_timeout(readb, val, ((val & cond) == cond),
+				PHY_INIT_WAIT_USLEEP_MAX,
+				PHY_INIT_WAIT_TIMEOUT, false,
+				imx8_phy->base + IMX8Q_PHY_REG48_PMA_STATUS);
+		if (ret)
+			dev_err(imx8_phy->dev, "PHY calibration is timeout\n");
+		else
+			dev_info(imx8_phy->dev, "PHY calibration is done\n");
+	}
+
+	return ret;
+
+err_exit:
+	if (imx8_phy->mode == IMX8Q_PHY_PCIE_MODE) {
+		clk_disable_unprepare(imx8_phy->pipe_pclk);
+		clk_disable_unprepare(imx8_phy->apb_pclk);
+	}
+
+	return ret;
+}
+
+static int imx8q_pcie_phy_power_off(struct phy *phy)
+{
+	struct imx8q_pcie_phy *imx8_phy = phy_get_drvdata(phy);
+
+	if (imx8_phy->mode == IMX8Q_PHY_PCIE_MODE) {
+		clk_disable_unprepare(imx8_phy->pipe_pclk);
+		clk_disable_unprepare(imx8_phy->apb_pclk);
+	}
+
+	return 0;
+}
+
+static const struct phy_ops imx8q_pcie_phy_ops = {
+	.init		= imx8q_pcie_phy_init,
+	.exit		= imx8q_pcie_phy_exit,
+	.power_on	= imx8q_pcie_phy_power_on,
+	.power_off	= imx8q_pcie_phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+static const struct of_device_id imx8q_pcie_phy_of_match[] = {
+	{.compatible = "fsl,imx8qm-pcie-phy", },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(of, imx8q_pcie_phy_of_match);
+
+static int imx8q_pcie_phy_probe(struct platform_device *pdev)
+{
+	int ret;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct imx8q_pcie_phy *imx8_phy;
+	const struct of_device_id *of_id;
+	struct phy_provider *phy_provider;
+	struct resource *res;
+
+	of_id = of_match_device(imx8q_pcie_phy_of_match, dev);
+	if (!of_id)
+		return -EINVAL;
+
+	imx8_phy = devm_kzalloc(dev, sizeof(*imx8_phy), GFP_KERNEL);
+	if (!imx8_phy)
+		return -ENOMEM;
+
+	imx8_phy->dev = dev;
+
+	/* Get PHY refclk pad mode */
+	of_property_read_u32(np, "fsl,refclk-pad-mode",
+			     &imx8_phy->refclk_pad_mode);
+
+	/* Get HSIO configuration mode */
+	if (of_property_read_u32(np, "hsio-cfg", &imx8_phy->hsio_cfg))
+		imx8_phy->hsio_cfg = 0;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	imx8_phy->base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(imx8_phy->base))
+		return PTR_ERR(imx8_phy->base);
+
+	if (res->start == IMX8Q_PHYX2_LANE1_BASE_ADDR)
+		imx8_phy->lane_id = 1;
+	else if (res->start == IMX8Q_PHYX1_LANE0_BASE_ADDR)
+		imx8_phy->lane_id = 2;
+
+	if (unlikely((imx8_phy->lane_id == 2) &&
+		   (imx8_phy->hsio_cfg != PCIEAX2PCIEBX1)))
+		imx8_phy->mode = IMX8Q_PHY_SATA_MODE;
+	else
+		imx8_phy->mode = IMX8Q_PHY_PCIE_MODE;
+
+	/* Fetch clocks */
+	if (imx8_phy->mode == IMX8Q_PHY_PCIE_MODE) {
+		/* APB clock is not required by SATA */
+		imx8_phy->apb_pclk = devm_clk_get(dev, "apb_pclk");
+		if (IS_ERR(imx8_phy->apb_pclk))
+			return dev_err_probe(dev, PTR_ERR(imx8_phy->apb_pclk),
+					     "can't get apb_pclk clock\n");
+	}
+
+	imx8_phy->ctrl_ips_clk = devm_clk_get(dev, "ctrl_ips_clk");
+	if (IS_ERR(imx8_phy->ctrl_ips_clk))
+		return dev_err_probe(dev, PTR_ERR(imx8_phy->ctrl_ips_clk),
+				     "can't get ctrl_ips_clk clock\n");
+
+	imx8_phy->misc_ips_clk = devm_clk_get(dev, "misc_ips_clk");
+	if (IS_ERR(imx8_phy->misc_ips_clk))
+		return dev_err_probe(dev, PTR_ERR(imx8_phy->misc_ips_clk),
+				     "can't get misc_ips_clk clock\n");
+
+	imx8_phy->pipe_pclk = devm_clk_get(dev, "pipe_pclk");
+	if (IS_ERR(imx8_phy->pipe_pclk))
+		return dev_err_probe(dev, PTR_ERR(imx8_phy->pipe_pclk),
+				     "can't get pipe_pclk clock\n");
+
+	imx8_phy->phy_ips_clk = devm_clk_get(dev, "phy_ips_clk");
+	if (IS_ERR(imx8_phy->phy_ips_clk))
+		return dev_err_probe(dev, PTR_ERR(imx8_phy->phy_ips_clk),
+				     "can't get phy_ips_clk clock\n");
+
+	/* Grab GPR config register range */
+	imx8_phy->ctrl_gpr = syscon_regmap_lookup_by_phandle(np, "ctrl-csr");
+	if (IS_ERR(imx8_phy->ctrl_gpr))
+		return dev_err_probe(dev, PTR_ERR(imx8_phy->ctrl_gpr),
+				     "can't get hsio ctrl registers\n");
+
+	imx8_phy->misc_gpr = syscon_regmap_lookup_by_phandle(np, "misc-csr");
+	if (IS_ERR(imx8_phy->misc_gpr))
+		return dev_err_probe(dev, PTR_ERR(imx8_phy->misc_gpr),
+				     "can't get hsio misc registers\n");
+
+	imx8_phy->phy_gpr = syscon_regmap_lookup_by_phandle(np, "phy-csr");
+	if (IS_ERR(imx8_phy->phy_gpr))
+		return dev_err_probe(dev, PTR_ERR(imx8_phy->phy_gpr),
+				     "can't get hsio phy registers\n");
+
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	imx8_phy->phy = devm_phy_create(dev, NULL, &imx8q_pcie_phy_ops);
+	if (IS_ERR(imx8_phy->phy)) {
+		ret = PTR_ERR(imx8_phy->phy);
+		goto err_exit;
+	}
+
+	phy_set_drvdata(imx8_phy->phy, imx8_phy);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+	ret = PTR_ERR_OR_ZERO(phy_provider);
+	if (ret < 0)
+		goto err_exit;
+
+	return ret;
+
+err_exit:
+	pm_runtime_disable(dev);
+	pm_runtime_set_suspended(dev);
+
+	return ret;
+}
+
+static struct platform_driver imx8q_pcie_phy_driver = {
+	.probe	= imx8q_pcie_phy_probe,
+	.driver = {
+		.name	= "imx8q-pcie-phy",
+		.of_match_table	= imx8q_pcie_phy_of_match,
+	}
+};
+module_platform_driver(imx8q_pcie_phy_driver);
+
+MODULE_DESCRIPTION("FSL IMX8Q PCIE PHY driver");
+MODULE_LICENSE("GPL");
-- 
2.34.1

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