drivers/usb/phy/phy-mxs-usb.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright 2012-2014 Freescale Semiconductor, Inc.
  * Copyright (C) 2012 Marek Vasut <marex@denx.de>
  * on behalf of DENX Software Engineering GmbH
  *
  * The code contained herein is licensed under the GNU General Public
  * License. You may obtain a copy of the GNU General Public License
  * Version 2 or later at the following locations:
  *
  * http://www.opensource.org/licenses/gpl-license.html
  * http://www.gnu.org/copyleft/gpl.html
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/clk.h>
 #include <linux/usb/otg.h>
 #include <linux/stmp_device.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of_device.h>
 #include <linux/regmap.h>
 #include <linux/mfd/syscon.h>

 #define DRIVER_NAME "mxs_phy"

 #define HW_USBPHY_PWD				0x00
 #define HW_USBPHY_CTRL				0x30
 #define HW_USBPHY_CTRL_SET			0x34
 #define HW_USBPHY_CTRL_CLR			0x38

 #define HW_USBPHY_DEBUG_SET			0x54
 #define HW_USBPHY_DEBUG_CLR			0x58

 #define HW_USBPHY_IP				0x90
 #define HW_USBPHY_IP_SET			0x94
 #define HW_USBPHY_IP_CLR			0x98

 #define BM_USBPHY_CTRL_SFTRST			BIT(31)
 #define BM_USBPHY_CTRL_CLKGATE			BIT(30)
 #define BM_USBPHY_CTRL_OTG_ID_VALUE		BIT(27)
 #define BM_USBPHY_CTRL_ENAUTOSET_USBCLKS	BIT(26)
 #define BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE	BIT(25)
 #define BM_USBPHY_CTRL_ENVBUSCHG_WKUP		BIT(23)
 #define BM_USBPHY_CTRL_ENIDCHG_WKUP		BIT(22)
 #define BM_USBPHY_CTRL_ENDPDMCHG_WKUP		BIT(21)
 #define BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD	BIT(20)
 #define BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE	BIT(19)
 #define BM_USBPHY_CTRL_ENAUTO_PWRON_PLL		BIT(18)
 #define BM_USBPHY_CTRL_ENUTMILEVEL3		BIT(15)
 #define BM_USBPHY_CTRL_ENUTMILEVEL2		BIT(14)
 #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT	BIT(1)

 #define BM_USBPHY_IP_FIX                       (BIT(17) | BIT(18))

 #define BM_USBPHY_DEBUG_CLKGATE			BIT(30)

 /* Anatop Registers */
 #define ANADIG_ANA_MISC0			0x150
 #define ANADIG_ANA_MISC0_SET			0x154
 #define ANADIG_ANA_MISC0_CLR			0x158

 #define ANADIG_USB1_VBUS_DET_STAT		0x1c0
 #define ANADIG_USB2_VBUS_DET_STAT		0x220

 #define ANADIG_USB1_LOOPBACK_SET		0x1e4
 #define ANADIG_USB1_LOOPBACK_CLR		0x1e8
 #define ANADIG_USB2_LOOPBACK_SET		0x244
 #define ANADIG_USB2_LOOPBACK_CLR		0x248

 #define ANADIG_USB1_MISC			0x1f0
 #define ANADIG_USB2_MISC			0x250

 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG	BIT(12)
 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL BIT(11)

 #define BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID	BIT(3)
 #define BM_ANADIG_USB2_VBUS_DET_STAT_VBUS_VALID	BIT(3)

 #define BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1	BIT(2)
 #define BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN	BIT(5)
 #define BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1	BIT(2)
 #define BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN	BIT(5)

 #define BM_ANADIG_USB1_MISC_RX_VPIN_FS		BIT(29)
 #define BM_ANADIG_USB1_MISC_RX_VMIN_FS		BIT(28)
 #define BM_ANADIG_USB2_MISC_RX_VPIN_FS		BIT(29)
 #define BM_ANADIG_USB2_MISC_RX_VMIN_FS		BIT(28)

 #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)

 /* Do disconnection between PHY and controller without vbus */
 #define MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS	BIT(0)

 /*
  * The PHY will be in messy if there is a wakeup after putting
  * bus to suspend (set portsc.suspendM) but before setting PHY to low
  * power mode (set portsc.phcd).
  */
 #define MXS_PHY_ABNORMAL_IN_SUSPEND		BIT(1)

 /*
  * The SOF sends too fast after resuming, it will cause disconnection
  * between host and high speed device.
  */
 #define MXS_PHY_SENDING_SOF_TOO_FAST		BIT(2)

 /*
  * IC has bug fixes logic, they include
  * MXS_PHY_ABNORMAL_IN_SUSPEND and MXS_PHY_SENDING_SOF_TOO_FAST
  * which are described at above flags, the RTL will handle it
  * according to different versions.
  */
 #define MXS_PHY_NEED_IP_FIX			BIT(3)

 struct mxs_phy_data {
 	unsigned int flags;
 };

 static const struct mxs_phy_data imx23_phy_data = {
 	.flags = MXS_PHY_ABNORMAL_IN_SUSPEND | MXS_PHY_SENDING_SOF_TOO_FAST,
 };

 static const struct mxs_phy_data imx6q_phy_data = {
 	.flags = MXS_PHY_SENDING_SOF_TOO_FAST |
 		MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
 		MXS_PHY_NEED_IP_FIX,
 };

 static const struct mxs_phy_data imx6sl_phy_data = {
 	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
 		MXS_PHY_NEED_IP_FIX,
 };

 static const struct mxs_phy_data vf610_phy_data = {
 	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS |
 		MXS_PHY_NEED_IP_FIX,
 };

 static const struct mxs_phy_data imx6sx_phy_data = {
 	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
 };

 static const struct of_device_id mxs_phy_dt_ids[] = {
 	{ .compatible = "fsl,imx6sx-usbphy", .data = &imx6sx_phy_data, },
 	{ .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, },
 	{ .compatible = "fsl,imx6q-usbphy", .data = &imx6q_phy_data, },
 	{ .compatible = "fsl,imx23-usbphy", .data = &imx23_phy_data, },
 	{ .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);

 struct mxs_phy {
 	struct usb_phy phy;
 	struct clk *clk;
 	const struct mxs_phy_data *data;
 	struct regmap *regmap_anatop;
 	int port_id;
 };

 static inline bool is_imx6q_phy(struct mxs_phy *mxs_phy)
 {
 	return mxs_phy->data == &imx6q_phy_data;
 }

 static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy)
 {
 	return mxs_phy->data == &imx6sl_phy_data;
 }

 /*
  * PHY needs some 32K cycles to switch from 32K clock to
  * bus (such as AHB/AXI, etc) clock.
  */
 static void mxs_phy_clock_switch_delay(void)
 {
 	usleep_range(300, 400);
 }

 static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
 {
 	int ret;
 	void __iomem *base = mxs_phy->phy.io_priv;

 	ret = stmp_reset_block(base + HW_USBPHY_CTRL);
 	if (ret)
 		return ret;

 	/* Power up the PHY */
 	writel(0, base + HW_USBPHY_PWD);

 	/*
 	 * USB PHY Ctrl Setting
 	 * - Auto clock/power on
 	 * - Enable full/low speed support
 	 */
 	writel(BM_USBPHY_CTRL_ENAUTOSET_USBCLKS |
 		BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE |
 		BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD |
 		BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE |
 		BM_USBPHY_CTRL_ENAUTO_PWRON_PLL |
 		BM_USBPHY_CTRL_ENUTMILEVEL2 |
 		BM_USBPHY_CTRL_ENUTMILEVEL3,
 	       base + HW_USBPHY_CTRL_SET);

 	if (mxs_phy->data->flags & MXS_PHY_NEED_IP_FIX)
 		writel(BM_USBPHY_IP_FIX, base + HW_USBPHY_IP_SET);

 	return 0;
 }

 /* Return true if the vbus is there */
 static bool mxs_phy_get_vbus_status(struct mxs_phy *mxs_phy)
 {
 	unsigned int vbus_value;

 	if (!mxs_phy->regmap_anatop)
 		return false;

 	if (mxs_phy->port_id == 0)
 		regmap_read(mxs_phy->regmap_anatop,
 			ANADIG_USB1_VBUS_DET_STAT,
 			&vbus_value);
 	else if (mxs_phy->port_id == 1)
 		regmap_read(mxs_phy->regmap_anatop,
 			ANADIG_USB2_VBUS_DET_STAT,
 			&vbus_value);

 	if (vbus_value & BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)
 		return true;
 	else
 		return false;
 }

 static void __mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool disconnect)
 {
 	void __iomem *base = mxs_phy->phy.io_priv;
 	u32 reg;

 	if (disconnect)
 		writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
 			base + HW_USBPHY_DEBUG_CLR);

 	if (mxs_phy->port_id == 0) {
 		reg = disconnect ? ANADIG_USB1_LOOPBACK_SET
 			: ANADIG_USB1_LOOPBACK_CLR;
 		regmap_write(mxs_phy->regmap_anatop, reg,
 			BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 |
 			BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN);
 	} else if (mxs_phy->port_id == 1) {
 		reg = disconnect ? ANADIG_USB2_LOOPBACK_SET
 			: ANADIG_USB2_LOOPBACK_CLR;
 		regmap_write(mxs_phy->regmap_anatop, reg,
 			BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 |
 			BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN);
 	}

 	if (!disconnect)
 		writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
 			base + HW_USBPHY_DEBUG_SET);

 	/* Delay some time, and let Linestate be SE0 for controller */
 	if (disconnect)
 		usleep_range(500, 1000);
 }

 static bool mxs_phy_is_otg_host(struct mxs_phy *mxs_phy)
 {
 	void __iomem *base = mxs_phy->phy.io_priv;
 	u32 phyctrl = readl(base + HW_USBPHY_CTRL);

 	if (IS_ENABLED(CONFIG_USB_OTG) &&
 			!(phyctrl & BM_USBPHY_CTRL_OTG_ID_VALUE))
 		return true;

 	return false;
 }

 static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on)
 {
 	bool vbus_is_on = false;

 	/* If the SoCs don't need to disconnect line without vbus, quit */
 	if (!(mxs_phy->data->flags & MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS))
 		return;

 	/* If the SoCs don't have anatop, quit */
 	if (!mxs_phy->regmap_anatop)
 		return;

 	vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);

 	if (on && !vbus_is_on && !mxs_phy_is_otg_host(mxs_phy))
 		__mxs_phy_disconnect_line(mxs_phy, true);
 	else
 		__mxs_phy_disconnect_line(mxs_phy, false);

 }

 static int mxs_phy_init(struct usb_phy *phy)
 {
 	int ret;
 	struct mxs_phy *mxs_phy = to_mxs_phy(phy);

 	mxs_phy_clock_switch_delay();
 	ret = clk_prepare_enable(mxs_phy->clk);
 	if (ret)
 		return ret;

 	return mxs_phy_hw_init(mxs_phy);
 }

 static void mxs_phy_shutdown(struct usb_phy *phy)
 {
 	struct mxs_phy *mxs_phy = to_mxs_phy(phy);
 	u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP |
 			BM_USBPHY_CTRL_ENDPDMCHG_WKUP |
 			BM_USBPHY_CTRL_ENIDCHG_WKUP |
 			BM_USBPHY_CTRL_ENAUTOSET_USBCLKS |
 			BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE |
 			BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD |
 			BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE |
 			BM_USBPHY_CTRL_ENAUTO_PWRON_PLL;

 	writel(value, phy->io_priv + HW_USBPHY_CTRL_CLR);
 	writel(0xffffffff, phy->io_priv + HW_USBPHY_PWD);

 	writel(BM_USBPHY_CTRL_CLKGATE,
 	       phy->io_priv + HW_USBPHY_CTRL_SET);

 	clk_disable_unprepare(mxs_phy->clk);
 }

 static bool mxs_phy_is_low_speed_connection(struct mxs_phy *mxs_phy)
 {
 	unsigned int line_state;
 	/* bit definition is the same for all controllers */
 	unsigned int dp_bit = BM_ANADIG_USB1_MISC_RX_VPIN_FS,
 		     dm_bit = BM_ANADIG_USB1_MISC_RX_VMIN_FS;
 	unsigned int reg = ANADIG_USB1_MISC;

 	/* If the SoCs don't have anatop, quit */
 	if (!mxs_phy->regmap_anatop)
 		return false;

 	if (mxs_phy->port_id == 0)
 		reg = ANADIG_USB1_MISC;
 	else if (mxs_phy->port_id == 1)
 		reg = ANADIG_USB2_MISC;

 	regmap_read(mxs_phy->regmap_anatop, reg, &line_state);

 	if ((line_state & (dp_bit | dm_bit)) ==  dm_bit)
 		return true;
 	else
 		return false;
 }

 static int mxs_phy_suspend(struct usb_phy *x, int suspend)
 {
 	int ret;
 	struct mxs_phy *mxs_phy = to_mxs_phy(x);
 	bool low_speed_connection, vbus_is_on;

 	low_speed_connection = mxs_phy_is_low_speed_connection(mxs_phy);
 	vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);

 	if (suspend) {
 		/*
 		 * FIXME: Do not power down RXPWD1PT1 bit for low speed
 		 * connect. The low speed connection will have problem at
 		 * very rare cases during usb suspend and resume process.
 		 */
 		if (low_speed_connection & vbus_is_on) {
 			/*
 			 * If value to be set as pwd value is not 0xffffffff,
 			 * several 32Khz cycles are needed.
 			 */
 			mxs_phy_clock_switch_delay();
 			writel(0xffbfffff, x->io_priv + HW_USBPHY_PWD);
 		} else {
 			writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
 		}
 		writel(BM_USBPHY_CTRL_CLKGATE,
 		       x->io_priv + HW_USBPHY_CTRL_SET);
 		clk_disable_unprepare(mxs_phy->clk);
 	} else {
 		mxs_phy_clock_switch_delay();
 		ret = clk_prepare_enable(mxs_phy->clk);
 		if (ret)
 			return ret;
 		writel(BM_USBPHY_CTRL_CLKGATE,
 		       x->io_priv + HW_USBPHY_CTRL_CLR);
 		writel(0, x->io_priv + HW_USBPHY_PWD);
 	}

 	return 0;
 }

 static int mxs_phy_set_wakeup(struct usb_phy *x, bool enabled)
 {
 	struct mxs_phy *mxs_phy = to_mxs_phy(x);
 	u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP |
 			BM_USBPHY_CTRL_ENDPDMCHG_WKUP |
 				BM_USBPHY_CTRL_ENIDCHG_WKUP;
 	if (enabled) {
 		mxs_phy_disconnect_line(mxs_phy, true);
 		writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_SET);
 	} else {
 		writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_CLR);
 		mxs_phy_disconnect_line(mxs_phy, false);
 	}

 	return 0;
 }

 static int mxs_phy_on_connect(struct usb_phy *phy,
 		enum usb_device_speed speed)
 {
 	dev_dbg(phy->dev, "%s device has connected\n",
 		(speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");

 	if (speed == USB_SPEED_HIGH)
 		writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 		       phy->io_priv + HW_USBPHY_CTRL_SET);

 	return 0;
 }

 static int mxs_phy_on_disconnect(struct usb_phy *phy,
 		enum usb_device_speed speed)
 {
 	dev_dbg(phy->dev, "%s device has disconnected\n",
 		(speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");

 	/* Sometimes, the speed is not high speed when the error occurs */
 	if (readl(phy->io_priv + HW_USBPHY_CTRL) &
 			BM_USBPHY_CTRL_ENHOSTDISCONDETECT)
 		writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
 		       phy->io_priv + HW_USBPHY_CTRL_CLR);

 	return 0;
 }

 static int mxs_phy_probe(struct platform_device *pdev)
 {
 	struct resource *res;
 	void __iomem *base;
 	struct clk *clk;
 	struct mxs_phy *mxs_phy;
 	int ret;
 	const struct of_device_id *of_id =
 			of_match_device(mxs_phy_dt_ids, &pdev->dev);
 	struct device_node *np = pdev->dev.of_node;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(base))
 		return PTR_ERR(base);

 	clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(clk)) {
 		dev_err(&pdev->dev,
 			"can't get the clock, err=%ld", PTR_ERR(clk));
 		return PTR_ERR(clk);
 	}

 	mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
 	if (!mxs_phy)
 		return -ENOMEM;

 	/* Some SoCs don't have anatop registers */
 	if (of_get_property(np, "fsl,anatop", NULL)) {
 		mxs_phy->regmap_anatop = syscon_regmap_lookup_by_phandle
 			(np, "fsl,anatop");
 		if (IS_ERR(mxs_phy->regmap_anatop)) {
 			dev_dbg(&pdev->dev,
 				"failed to find regmap for anatop\n");
 			return PTR_ERR(mxs_phy->regmap_anatop);
 		}
 	}

 	ret = of_alias_get_id(np, "usbphy");
 	if (ret < 0)
 		dev_dbg(&pdev->dev, "failed to get alias id, errno %d\n", ret);
 	mxs_phy->port_id = ret;

 	mxs_phy->phy.io_priv		= base;
 	mxs_phy->phy.dev		= &pdev->dev;
 	mxs_phy->phy.label		= DRIVER_NAME;
 	mxs_phy->phy.init		= mxs_phy_init;
 	mxs_phy->phy.shutdown		= mxs_phy_shutdown;
 	mxs_phy->phy.set_suspend	= mxs_phy_suspend;
 	mxs_phy->phy.notify_connect	= mxs_phy_on_connect;
 	mxs_phy->phy.notify_disconnect	= mxs_phy_on_disconnect;
 	mxs_phy->phy.type		= USB_PHY_TYPE_USB2;
 	mxs_phy->phy.set_wakeup		= mxs_phy_set_wakeup;

 	mxs_phy->clk = clk;
 	mxs_phy->data = of_id->data;

 	platform_set_drvdata(pdev, mxs_phy);

 	device_set_wakeup_capable(&pdev->dev, true);

 	return usb_add_phy_dev(&mxs_phy->phy);
 }

 static int mxs_phy_remove(struct platform_device *pdev)
 {
 	struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);

 	usb_remove_phy(&mxs_phy->phy);

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static void mxs_phy_enable_ldo_in_suspend(struct mxs_phy *mxs_phy, bool on)
 {
 	unsigned int reg = on ? ANADIG_ANA_MISC0_SET : ANADIG_ANA_MISC0_CLR;

 	/* If the SoCs don't have anatop, quit */
 	if (!mxs_phy->regmap_anatop)
 		return;

 	if (is_imx6q_phy(mxs_phy))
 		regmap_write(mxs_phy->regmap_anatop, reg,
 			BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG);
 	else if (is_imx6sl_phy(mxs_phy))
 		regmap_write(mxs_phy->regmap_anatop,
 			reg, BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL);
 }

 static int mxs_phy_system_suspend(struct device *dev)
 {
 	struct mxs_phy *mxs_phy = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev))
 		mxs_phy_enable_ldo_in_suspend(mxs_phy, true);

 	return 0;
 }

 static int mxs_phy_system_resume(struct device *dev)
 {
 	struct mxs_phy *mxs_phy = dev_get_drvdata(dev);

 	if (device_may_wakeup(dev))
 		mxs_phy_enable_ldo_in_suspend(mxs_phy, false);

 	return 0;
 }
 #endif /* CONFIG_PM_SLEEP */

 static SIMPLE_DEV_PM_OPS(mxs_phy_pm, mxs_phy_system_suspend,
 		mxs_phy_system_resume);

 static struct platform_driver mxs_phy_driver = {
 	.probe = mxs_phy_probe,
 	.remove = mxs_phy_remove,
 	.driver = {
 		.name = DRIVER_NAME,
 		.of_match_table = mxs_phy_dt_ids,
 		.pm = &mxs_phy_pm,
 	 },
 };

 static int __init mxs_phy_module_init(void)
 {
 	return platform_driver_register(&mxs_phy_driver);
 }
 postcore_initcall(mxs_phy_module_init);

 static void __exit mxs_phy_module_exit(void)
 {
 	platform_driver_unregister(&mxs_phy_driver);
 }
 module_exit(mxs_phy_module_exit);

 MODULE_ALIAS("platform:mxs-usb-phy");
 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
 MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright 2012-2014 Freescale Semiconductor, Inc.
	* Copyright (C) 2012 Marek Vasut <marex@denx.de>
	* on behalf of DENX Software Engineering GmbH
	*
	* The code contained herein is licensed under the GNU General Public
	* License. You may obtain a copy of the GNU General Public License
	* Version 2 or later at the following locations:
	*
	* http://www.opensource.org/licenses/gpl-license.html
	* http://www.gnu.org/copyleft/gpl.html
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/platform_device.h>
	#include <linux/clk.h>
	#include <linux/usb/otg.h>
	#include <linux/stmp_device.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/of_device.h>
	#include <linux/regmap.h>
	#include <linux/mfd/syscon.h>

	#define DRIVER_NAME "mxs_phy"

	#define HW_USBPHY_PWD 0x00
	#define HW_USBPHY_CTRL 0x30
	#define HW_USBPHY_CTRL_SET 0x34
	#define HW_USBPHY_CTRL_CLR 0x38

	#define HW_USBPHY_DEBUG_SET 0x54
	#define HW_USBPHY_DEBUG_CLR 0x58

	#define HW_USBPHY_IP 0x90
	#define HW_USBPHY_IP_SET 0x94
	#define HW_USBPHY_IP_CLR 0x98

	#define BM_USBPHY_CTRL_SFTRST BIT(31)
	#define BM_USBPHY_CTRL_CLKGATE BIT(30)
	#define BM_USBPHY_CTRL_OTG_ID_VALUE BIT(27)
	#define BM_USBPHY_CTRL_ENAUTOSET_USBCLKS BIT(26)
	#define BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE BIT(25)
	#define BM_USBPHY_CTRL_ENVBUSCHG_WKUP BIT(23)
	#define BM_USBPHY_CTRL_ENIDCHG_WKUP BIT(22)
	#define BM_USBPHY_CTRL_ENDPDMCHG_WKUP BIT(21)
	#define BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD BIT(20)
	#define BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE BIT(19)
	#define BM_USBPHY_CTRL_ENAUTO_PWRON_PLL BIT(18)
	#define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15)
	#define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14)
	#define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1)

	#define BM_USBPHY_IP_FIX (BIT(17) \| BIT(18))

	#define BM_USBPHY_DEBUG_CLKGATE BIT(30)

	/* Anatop Registers */
	#define ANADIG_ANA_MISC0 0x150
	#define ANADIG_ANA_MISC0_SET 0x154
	#define ANADIG_ANA_MISC0_CLR 0x158

	#define ANADIG_USB1_VBUS_DET_STAT 0x1c0
	#define ANADIG_USB2_VBUS_DET_STAT 0x220

	#define ANADIG_USB1_LOOPBACK_SET 0x1e4
	#define ANADIG_USB1_LOOPBACK_CLR 0x1e8
	#define ANADIG_USB2_LOOPBACK_SET 0x244
	#define ANADIG_USB2_LOOPBACK_CLR 0x248

	#define ANADIG_USB1_MISC 0x1f0
	#define ANADIG_USB2_MISC 0x250

	#define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG BIT(12)
	#define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL BIT(11)

	#define BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3)
	#define BM_ANADIG_USB2_VBUS_DET_STAT_VBUS_VALID BIT(3)

	#define BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 BIT(2)
	#define BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN BIT(5)
	#define BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 BIT(2)
	#define BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN BIT(5)

	#define BM_ANADIG_USB1_MISC_RX_VPIN_FS BIT(29)
	#define BM_ANADIG_USB1_MISC_RX_VMIN_FS BIT(28)
	#define BM_ANADIG_USB2_MISC_RX_VPIN_FS BIT(29)
	#define BM_ANADIG_USB2_MISC_RX_VMIN_FS BIT(28)

	#define to_mxs_phy(p) container_of((p), struct mxs_phy, phy)

	/* Do disconnection between PHY and controller without vbus */
	#define MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS BIT(0)

	/*
	* The PHY will be in messy if there is a wakeup after putting
	* bus to suspend (set portsc.suspendM) but before setting PHY to low
	* power mode (set portsc.phcd).
	*/
	#define MXS_PHY_ABNORMAL_IN_SUSPEND BIT(1)

	/*
	* The SOF sends too fast after resuming, it will cause disconnection
	* between host and high speed device.
	*/
	#define MXS_PHY_SENDING_SOF_TOO_FAST BIT(2)

	/*
	* IC has bug fixes logic, they include
	* MXS_PHY_ABNORMAL_IN_SUSPEND and MXS_PHY_SENDING_SOF_TOO_FAST
	* which are described at above flags, the RTL will handle it
	* according to different versions.
	*/
	#define MXS_PHY_NEED_IP_FIX BIT(3)

	struct mxs_phy_data {
	unsigned int flags;
	};

	static const struct mxs_phy_data imx23_phy_data = {
	.flags = MXS_PHY_ABNORMAL_IN_SUSPEND \| MXS_PHY_SENDING_SOF_TOO_FAST,
	};

	static const struct mxs_phy_data imx6q_phy_data = {
	.flags = MXS_PHY_SENDING_SOF_TOO_FAST \|
	MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS \|
	MXS_PHY_NEED_IP_FIX,
	};

	static const struct mxs_phy_data imx6sl_phy_data = {
	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS \|
	MXS_PHY_NEED_IP_FIX,
	};

	static const struct mxs_phy_data vf610_phy_data = {
	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS \|
	MXS_PHY_NEED_IP_FIX,
	};

	static const struct mxs_phy_data imx6sx_phy_data = {
	.flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS,
	};

	static const struct of_device_id mxs_phy_dt_ids[] = {
	{ .compatible = "fsl,imx6sx-usbphy", .data = &imx6sx_phy_data, },
	{ .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, },
	{ .compatible = "fsl,imx6q-usbphy", .data = &imx6q_phy_data, },
	{ .compatible = "fsl,imx23-usbphy", .data = &imx23_phy_data, },
	{ .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, },
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids);

	struct mxs_phy {
	struct usb_phy phy;
	struct clk *clk;
	const struct mxs_phy_data *data;
	struct regmap *regmap_anatop;
	int port_id;
	};

	static inline bool is_imx6q_phy(struct mxs_phy *mxs_phy)
	{
	return mxs_phy->data == &imx6q_phy_data;
	}

	static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy)
	{
	return mxs_phy->data == &imx6sl_phy_data;
	}

	/*
	* PHY needs some 32K cycles to switch from 32K clock to
	* bus (such as AHB/AXI, etc) clock.
	*/
	static void mxs_phy_clock_switch_delay(void)
	{
	usleep_range(300, 400);
	}

	static int mxs_phy_hw_init(struct mxs_phy *mxs_phy)
	{
	int ret;
	void __iomem *base = mxs_phy->phy.io_priv;

	ret = stmp_reset_block(base + HW_USBPHY_CTRL);
	if (ret)
	return ret;

	/* Power up the PHY */
	writel(0, base + HW_USBPHY_PWD);

	/*
	* USB PHY Ctrl Setting
	* - Auto clock/power on
	* - Enable full/low speed support
	*/
	writel(BM_USBPHY_CTRL_ENAUTOSET_USBCLKS \|
	BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE \|
	BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD \|
	BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE \|
	BM_USBPHY_CTRL_ENAUTO_PWRON_PLL \|
	BM_USBPHY_CTRL_ENUTMILEVEL2 \|
	BM_USBPHY_CTRL_ENUTMILEVEL3,
	base + HW_USBPHY_CTRL_SET);

	if (mxs_phy->data->flags & MXS_PHY_NEED_IP_FIX)
	writel(BM_USBPHY_IP_FIX, base + HW_USBPHY_IP_SET);

	return 0;
	}

	/* Return true if the vbus is there */
	static bool mxs_phy_get_vbus_status(struct mxs_phy *mxs_phy)
	{
	unsigned int vbus_value;

	if (!mxs_phy->regmap_anatop)
	return false;

	if (mxs_phy->port_id == 0)
	regmap_read(mxs_phy->regmap_anatop,
	ANADIG_USB1_VBUS_DET_STAT,
	&vbus_value);
	else if (mxs_phy->port_id == 1)
	regmap_read(mxs_phy->regmap_anatop,
	ANADIG_USB2_VBUS_DET_STAT,
	&vbus_value);

	if (vbus_value & BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)
	return true;
	else
	return false;
	}

	static void __mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool disconnect)
	{
	void __iomem *base = mxs_phy->phy.io_priv;
	u32 reg;

	if (disconnect)
	writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
	base + HW_USBPHY_DEBUG_CLR);

	if (mxs_phy->port_id == 0) {
	reg = disconnect ? ANADIG_USB1_LOOPBACK_SET
	: ANADIG_USB1_LOOPBACK_CLR;
	regmap_write(mxs_phy->regmap_anatop, reg,
	BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 \|
	BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN);
	} else if (mxs_phy->port_id == 1) {
	reg = disconnect ? ANADIG_USB2_LOOPBACK_SET
	: ANADIG_USB2_LOOPBACK_CLR;
	regmap_write(mxs_phy->regmap_anatop, reg,
	BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 \|
	BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN);
	}

	if (!disconnect)
	writel_relaxed(BM_USBPHY_DEBUG_CLKGATE,
	base + HW_USBPHY_DEBUG_SET);

	/* Delay some time, and let Linestate be SE0 for controller */
	if (disconnect)
	usleep_range(500, 1000);
	}

	static bool mxs_phy_is_otg_host(struct mxs_phy *mxs_phy)
	{
	void __iomem *base = mxs_phy->phy.io_priv;
	u32 phyctrl = readl(base + HW_USBPHY_CTRL);

	if (IS_ENABLED(CONFIG_USB_OTG) &&
	!(phyctrl & BM_USBPHY_CTRL_OTG_ID_VALUE))
	return true;

	return false;
	}

	static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on)
	{
	bool vbus_is_on = false;

	/* If the SoCs don't need to disconnect line without vbus, quit */
	if (!(mxs_phy->data->flags & MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS))
	return;

	/* If the SoCs don't have anatop, quit */
	if (!mxs_phy->regmap_anatop)
	return;

	vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);

	if (on && !vbus_is_on && !mxs_phy_is_otg_host(mxs_phy))
	__mxs_phy_disconnect_line(mxs_phy, true);
	else
	__mxs_phy_disconnect_line(mxs_phy, false);

	}

	static int mxs_phy_init(struct usb_phy *phy)
	{
	int ret;
	struct mxs_phy *mxs_phy = to_mxs_phy(phy);

	mxs_phy_clock_switch_delay();
	ret = clk_prepare_enable(mxs_phy->clk);
	if (ret)
	return ret;

	return mxs_phy_hw_init(mxs_phy);
	}

	static void mxs_phy_shutdown(struct usb_phy *phy)
	{
	struct mxs_phy *mxs_phy = to_mxs_phy(phy);
	u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP \|
	BM_USBPHY_CTRL_ENDPDMCHG_WKUP \|
	BM_USBPHY_CTRL_ENIDCHG_WKUP \|
	BM_USBPHY_CTRL_ENAUTOSET_USBCLKS \|
	BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE \|
	BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD \|
	BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE \|
	BM_USBPHY_CTRL_ENAUTO_PWRON_PLL;

	writel(value, phy->io_priv + HW_USBPHY_CTRL_CLR);
	writel(0xffffffff, phy->io_priv + HW_USBPHY_PWD);

	writel(BM_USBPHY_CTRL_CLKGATE,
	phy->io_priv + HW_USBPHY_CTRL_SET);

	clk_disable_unprepare(mxs_phy->clk);
	}

	static bool mxs_phy_is_low_speed_connection(struct mxs_phy *mxs_phy)
	{
	unsigned int line_state;
	/* bit definition is the same for all controllers */
	unsigned int dp_bit = BM_ANADIG_USB1_MISC_RX_VPIN_FS,
	dm_bit = BM_ANADIG_USB1_MISC_RX_VMIN_FS;
	unsigned int reg = ANADIG_USB1_MISC;

	/* If the SoCs don't have anatop, quit */
	if (!mxs_phy->regmap_anatop)
	return false;

	if (mxs_phy->port_id == 0)
	reg = ANADIG_USB1_MISC;
	else if (mxs_phy->port_id == 1)
	reg = ANADIG_USB2_MISC;

	regmap_read(mxs_phy->regmap_anatop, reg, &line_state);

	if ((line_state & (dp_bit \| dm_bit)) == dm_bit)
	return true;
	else
	return false;
	}

	static int mxs_phy_suspend(struct usb_phy *x, int suspend)
	{
	int ret;
	struct mxs_phy *mxs_phy = to_mxs_phy(x);
	bool low_speed_connection, vbus_is_on;

	low_speed_connection = mxs_phy_is_low_speed_connection(mxs_phy);
	vbus_is_on = mxs_phy_get_vbus_status(mxs_phy);

	if (suspend) {
	/*
	* FIXME: Do not power down RXPWD1PT1 bit for low speed
	* connect. The low speed connection will have problem at
	* very rare cases during usb suspend and resume process.
	*/
	if (low_speed_connection & vbus_is_on) {
	/*
	* If value to be set as pwd value is not 0xffffffff,
	* several 32Khz cycles are needed.
	*/
	mxs_phy_clock_switch_delay();
	writel(0xffbfffff, x->io_priv + HW_USBPHY_PWD);
	} else {
	writel(0xffffffff, x->io_priv + HW_USBPHY_PWD);
	}
	writel(BM_USBPHY_CTRL_CLKGATE,
	x->io_priv + HW_USBPHY_CTRL_SET);
	clk_disable_unprepare(mxs_phy->clk);
	} else {
	mxs_phy_clock_switch_delay();
	ret = clk_prepare_enable(mxs_phy->clk);
	if (ret)
	return ret;
	writel(BM_USBPHY_CTRL_CLKGATE,
	x->io_priv + HW_USBPHY_CTRL_CLR);
	writel(0, x->io_priv + HW_USBPHY_PWD);
	}

	return 0;
	}

	static int mxs_phy_set_wakeup(struct usb_phy *x, bool enabled)
	{
	struct mxs_phy *mxs_phy = to_mxs_phy(x);
	u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP \|
	BM_USBPHY_CTRL_ENDPDMCHG_WKUP \|
	BM_USBPHY_CTRL_ENIDCHG_WKUP;
	if (enabled) {
	mxs_phy_disconnect_line(mxs_phy, true);
	writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_SET);
	} else {
	writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_CLR);
	mxs_phy_disconnect_line(mxs_phy, false);
	}

	return 0;
	}

	static int mxs_phy_on_connect(struct usb_phy *phy,
	enum usb_device_speed speed)
	{
	dev_dbg(phy->dev, "%s device has connected\n",
	(speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");

	if (speed == USB_SPEED_HIGH)
	writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
	phy->io_priv + HW_USBPHY_CTRL_SET);

	return 0;
	}

	static int mxs_phy_on_disconnect(struct usb_phy *phy,
	enum usb_device_speed speed)
	{
	dev_dbg(phy->dev, "%s device has disconnected\n",
	(speed == USB_SPEED_HIGH) ? "HS" : "FS/LS");

	/* Sometimes, the speed is not high speed when the error occurs */
	if (readl(phy->io_priv + HW_USBPHY_CTRL) &
	BM_USBPHY_CTRL_ENHOSTDISCONDETECT)
	writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT,
	phy->io_priv + HW_USBPHY_CTRL_CLR);

	return 0;
	}

	static int mxs_phy_probe(struct platform_device *pdev)
	{
	struct resource *res;
	void __iomem *base;
	struct clk *clk;
	struct mxs_phy *mxs_phy;
	int ret;
	const struct of_device_id *of_id =
	of_match_device(mxs_phy_dt_ids, &pdev->dev);
	struct device_node *np = pdev->dev.of_node;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(base))
	return PTR_ERR(base);

	clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(clk)) {
	dev_err(&pdev->dev,
	"can't get the clock, err=%ld", PTR_ERR(clk));
	return PTR_ERR(clk);
	}

	mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL);
	if (!mxs_phy)
	return -ENOMEM;

	/* Some SoCs don't have anatop registers */
	if (of_get_property(np, "fsl,anatop", NULL)) {
	mxs_phy->regmap_anatop = syscon_regmap_lookup_by_phandle
	(np, "fsl,anatop");
	if (IS_ERR(mxs_phy->regmap_anatop)) {
	dev_dbg(&pdev->dev,
	"failed to find regmap for anatop\n");
	return PTR_ERR(mxs_phy->regmap_anatop);
	}
	}

	ret = of_alias_get_id(np, "usbphy");
	if (ret < 0)
	dev_dbg(&pdev->dev, "failed to get alias id, errno %d\n", ret);
	mxs_phy->port_id = ret;

	mxs_phy->phy.io_priv = base;
	mxs_phy->phy.dev = &pdev->dev;
	mxs_phy->phy.label = DRIVER_NAME;
	mxs_phy->phy.init = mxs_phy_init;
	mxs_phy->phy.shutdown = mxs_phy_shutdown;
	mxs_phy->phy.set_suspend = mxs_phy_suspend;
	mxs_phy->phy.notify_connect = mxs_phy_on_connect;
	mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect;
	mxs_phy->phy.type = USB_PHY_TYPE_USB2;
	mxs_phy->phy.set_wakeup = mxs_phy_set_wakeup;

	mxs_phy->clk = clk;
	mxs_phy->data = of_id->data;

	platform_set_drvdata(pdev, mxs_phy);

	device_set_wakeup_capable(&pdev->dev, true);

	return usb_add_phy_dev(&mxs_phy->phy);
	}

	static int mxs_phy_remove(struct platform_device *pdev)
	{
	struct mxs_phy *mxs_phy = platform_get_drvdata(pdev);

	usb_remove_phy(&mxs_phy->phy);

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static void mxs_phy_enable_ldo_in_suspend(struct mxs_phy *mxs_phy, bool on)
	{
	unsigned int reg = on ? ANADIG_ANA_MISC0_SET : ANADIG_ANA_MISC0_CLR;

	/* If the SoCs don't have anatop, quit */
	if (!mxs_phy->regmap_anatop)
	return;

	if (is_imx6q_phy(mxs_phy))
	regmap_write(mxs_phy->regmap_anatop, reg,
	BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG);
	else if (is_imx6sl_phy(mxs_phy))
	regmap_write(mxs_phy->regmap_anatop,
	reg, BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL);
	}

	static int mxs_phy_system_suspend(struct device *dev)
	{
	struct mxs_phy *mxs_phy = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
	mxs_phy_enable_ldo_in_suspend(mxs_phy, true);

	return 0;
	}

	static int mxs_phy_system_resume(struct device *dev)
	{
	struct mxs_phy *mxs_phy = dev_get_drvdata(dev);

	if (device_may_wakeup(dev))
	mxs_phy_enable_ldo_in_suspend(mxs_phy, false);

	return 0;
	}
	#endif /* CONFIG_PM_SLEEP */

	static SIMPLE_DEV_PM_OPS(mxs_phy_pm, mxs_phy_system_suspend,
	mxs_phy_system_resume);

	static struct platform_driver mxs_phy_driver = {
	.probe = mxs_phy_probe,
	.remove = mxs_phy_remove,
	.driver = {
	.name = DRIVER_NAME,
	.of_match_table = mxs_phy_dt_ids,
	.pm = &mxs_phy_pm,
	},
	};

	static int __init mxs_phy_module_init(void)
	{
	return platform_driver_register(&mxs_phy_driver);
	}
	postcore_initcall(mxs_phy_module_init);

	static void __exit mxs_phy_module_exit(void)
	{
	platform_driver_unregister(&mxs_phy_driver);
	}
	module_exit(mxs_phy_module_exit);

	MODULE_ALIAS("platform:mxs-usb-phy");
	MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
	MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>");
	MODULE_DESCRIPTION("Freescale MXS USB PHY driver");
	MODULE_LICENSE("GPL");