[PATCH 1/5] phy: rockchip: add inno-usb3 phy driver

[Peter Geis <pgwipeout@gmail.com>]

Add the rockchip innosilicon usb3 phy driver, supporting devices such as the rk3328.
Pulled from:
https://github.com/FireflyTeam/kernel/blob/roc-rk3328-cc/drivers/phy/rockchip/phy-rockchip-inno-usb3.c

Signed-off-by: Peter Geis <pgwipeout@gmail.com>
---
 drivers/phy/rockchip/Kconfig                  |    9 +
 drivers/phy/rockchip/Makefile                 |    1 +
 drivers/phy/rockchip/phy-rockchip-inno-usb3.c | 1107 +++++++++++++++++
 3 files changed, 1117 insertions(+)
 create mode 100644 drivers/phy/rockchip/phy-rockchip-inno-usb3.c

diff --git a/drivers/phy/rockchip/Kconfig b/drivers/phy/rockchip/Kconfig
index c454c90cd99e..766407939d4a 100644
--- a/drivers/phy/rockchip/Kconfig
+++ b/drivers/phy/rockchip/Kconfig
@@ -35,6 +35,15 @@ config PHY_ROCKCHIP_INNO_USB2
 	help
 	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
 
+config PHY_ROCKCHIP_INNO_USB3
+	tristate "Rockchip INNO USB 3.0 PHY Driver"
+	depends on (ARCH_ROCKCHIP || COMPILE_TEST) && OF
+	depends on USB_SUPPORT
+	select GENERIC_PHY
+	select USB_PHY
+	help
+	  Support for Rockchip USB 3.0 PHY with Innosilicon IP block.
+
 config PHY_ROCKCHIP_PCIE
 	tristate "Rockchip PCIe PHY Driver"
 	depends on (ARCH_ROCKCHIP && OF) || COMPILE_TEST
diff --git a/drivers/phy/rockchip/Makefile b/drivers/phy/rockchip/Makefile
index fd21cbaf40dd..d7b3d16c19ae 100644
--- a/drivers/phy/rockchip/Makefile
+++ b/drivers/phy/rockchip/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
 obj-$(CONFIG_PHY_ROCKCHIP_EMMC)		+= phy-rockchip-emmc.o
 obj-$(CONFIG_PHY_ROCKCHIP_INNO_HDMI)	+= phy-rockchip-inno-hdmi.o
 obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
+obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB3)	+= phy-rockchip-inno-usb3.o
 obj-$(CONFIG_PHY_ROCKCHIP_PCIE)		+= phy-rockchip-pcie.o
 obj-$(CONFIG_PHY_ROCKCHIP_TYPEC)	+= phy-rockchip-typec.o
 obj-$(CONFIG_PHY_ROCKCHIP_USB)		+= phy-rockchip-usb.o
diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb3.c b/drivers/phy/rockchip/phy-rockchip-inno-usb3.c
new file mode 100644
index 000000000000..31fee8f3a705
--- /dev/null
+++ b/drivers/phy/rockchip/phy-rockchip-inno-usb3.c
@@ -0,0 +1,1107 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Rockchip USB 3.0 PHY with Innosilicon IP block driver
+ *
+ * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/debugfs.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_clk.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/usb/phy.h>
+#include <linux/uaccess.h>
+
+#define U3PHY_PORT_NUM	2
+#define BIT_WRITEABLE_SHIFT	16
+#define SCHEDULE_DELAY	(60 * HZ)
+
+#define U3PHY_APB_RST	BIT(0)
+#define U3PHY_POR_RST	BIT(1)
+#define U3PHY_MAC_RST	BIT(2)
+
+struct rockchip_u3phy;
+struct rockchip_u3phy_port;
+
+enum rockchip_u3phy_type {
+	U3PHY_TYPE_PIPE,
+	U3PHY_TYPE_UTMI,
+};
+
+enum rockchip_u3phy_pipe_pwr {
+	PIPE_PWR_P0	= 0,
+	PIPE_PWR_P1	= 1,
+	PIPE_PWR_P2	= 2,
+	PIPE_PWR_P3	= 3,
+	PIPE_PWR_MAX	= 4,
+};
+
+enum rockchip_u3phy_rest_req {
+	U3_POR_RSTN	= 0,
+	U2_POR_RSTN	= 1,
+	PIPE_MAC_RSTN	= 2,
+	UTMI_MAC_RSTN	= 3,
+	PIPE_APB_RSTN	= 4,
+	UTMI_APB_RSTN	= 5,
+	U3PHY_RESET_MAX	= 6,
+};
+
+enum rockchip_u3phy_utmi_state {
+	PHY_UTMI_HS_ONLINE	= 0,
+	PHY_UTMI_DISCONNECT	= 1,
+	PHY_UTMI_CONNECT	= 2,
+	PHY_UTMI_FS_LS_ONLINE	= 4,
+};
+
+/*
+ * @rvalue: reset value
+ * @dvalue: desired value
+ */
+struct u3phy_reg {
+	unsigned int	offset;
+	unsigned int	bitend;
+	unsigned int	bitstart;
+	unsigned int	rvalue;
+	unsigned int	dvalue;
+};
+
+struct rockchip_u3phy_grfcfg {
+	struct u3phy_reg	um_suspend;
+	struct u3phy_reg	ls_det_en;
+	struct u3phy_reg	ls_det_st;
+	struct u3phy_reg	um_ls;
+	struct u3phy_reg	um_hstdct;
+	struct u3phy_reg	u2_only_ctrl;
+	struct u3phy_reg	u3_disable;
+	struct u3phy_reg	pp_pwr_st;
+	struct u3phy_reg	pp_pwr_en[PIPE_PWR_MAX];
+};
+
+/**
+ * struct rockchip_u3phy_apbcfg: usb3-phy apb configuration.
+ * @u2_pre_emp: usb2-phy pre-emphasis tuning.
+ * @u2_pre_emp_sth: usb2-phy pre-emphasis strength tuning.
+ * @u2_odt_tuning: usb2-phy odt 45ohm tuning.
+ */
+struct rockchip_u3phy_apbcfg {
+	unsigned int	u2_pre_emp;
+	unsigned int	u2_pre_emp_sth;
+	unsigned int	u2_odt_tuning;
+};
+
+struct rockchip_u3phy_cfg {
+	unsigned int reg;
+	const struct rockchip_u3phy_grfcfg grfcfg;
+
+	int (*phy_pipe_power)(struct rockchip_u3phy *u3phy,
+			      struct rockchip_u3phy_port *u3phy_port,
+			      bool on);
+	int (*phy_tuning)(struct rockchip_u3phy *u3phy,
+			  struct rockchip_u3phy_port *u3phy_port,
+			  struct device_node *child_np);
+};
+
+struct rockchip_u3phy_port {
+	struct phy	*phy;
+	void __iomem	*base;
+	unsigned int	index;
+	unsigned char	type;
+	bool		suspended;
+	bool		refclk_25m_quirk;
+	struct mutex	mutex; /* mutex for updating register */
+	struct delayed_work	um_sm_work;
+};
+
+struct rockchip_u3phy {
+	struct device *dev;
+	struct regmap *u3phy_grf;
+	struct regmap *grf;
+	int um_ls_irq;
+	struct clk **clks;
+	int num_clocks;
+	struct dentry *root;
+	struct gpio_desc *vbus_drv_gpio;
+	struct reset_control *rsts[U3PHY_RESET_MAX];
+	struct rockchip_u3phy_apbcfg apbcfg;
+	const struct rockchip_u3phy_cfg *cfgs;
+	struct rockchip_u3phy_port ports[U3PHY_PORT_NUM];
+	struct usb_phy usb_phy;
+};
+
+static inline int param_write(void __iomem *base,
+			      const struct u3phy_reg *reg, bool desired)
+{
+	unsigned int val, mask;
+	unsigned int tmp = desired ? reg->dvalue : reg->rvalue;
+	int ret = 0;
+
+	mask = GENMASK(reg->bitend, reg->bitstart);
+	val = (tmp << reg->bitstart) | (mask << BIT_WRITEABLE_SHIFT);
+	ret = regmap_write(base, reg->offset, val);
+
+	return ret;
+}
+
+static inline bool param_exped(void __iomem *base,
+			       const struct u3phy_reg *reg,
+			       unsigned int value)
+{
+	int ret;
+	unsigned int tmp, orig;
+	unsigned int mask = GENMASK(reg->bitend, reg->bitstart);
+
+	ret = regmap_read(base, reg->offset, &orig);
+	if (ret)
+		return false;
+
+	tmp = (orig & mask) >> reg->bitstart;
+	return tmp == value;
+}
+
+static int rockchip_u3phy_usb2_only_show(struct seq_file *s, void *unused)
+{
+	struct rockchip_u3phy	*u3phy = s->private;
+
+	if (param_exped(u3phy->u3phy_grf, &u3phy->cfgs->grfcfg.u2_only_ctrl, 1))
+		dev_info(u3phy->dev, "u2\n");
+	else
+		dev_info(u3phy->dev, "u3\n");
+
+	return 0;
+}
+
+static int rockchip_u3phy_usb2_only_open(struct inode *inode,
+					 struct file *file)
+{
+	return single_open(file, rockchip_u3phy_usb2_only_show,
+			   inode->i_private);
+}
+
+static ssize_t rockchip_u3phy_usb2_only_write(struct file *file,
+					      const char __user *ubuf,
+					      size_t count, loff_t *ppos)
+{
+	struct seq_file			*s = file->private_data;
+	struct rockchip_u3phy		*u3phy = s->private;
+	struct rockchip_u3phy_port	*u3phy_port;
+	char				buf[32];
+	u8				index;
+
+	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
+		return -EFAULT;
+
+	if (!strncmp(buf, "u3", 2) &&
+	    param_exped(u3phy->u3phy_grf,
+			&u3phy->cfgs->grfcfg.u2_only_ctrl, 1)) {
+		dev_info(u3phy->dev, "Set usb3.0 and usb2.0 mode successfully\n");
+
+		gpiod_set_value_cansleep(u3phy->vbus_drv_gpio, 0);
+
+		param_write(u3phy->grf,
+			    &u3phy->cfgs->grfcfg.u3_disable, false);
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.u2_only_ctrl, false);
+
+		for (index = 0; index < U3PHY_PORT_NUM; index++) {
+			u3phy_port = &u3phy->ports[index];
+			/* enable u3 rx termimation */
+			if (u3phy_port->type == U3PHY_TYPE_PIPE)
+				writel(0x30, u3phy_port->base + 0xd8);
+		}
+
+		atomic_notifier_call_chain(&u3phy->usb_phy.notifier, 0, NULL);
+
+		gpiod_set_value_cansleep(u3phy->vbus_drv_gpio, 1);
+	} else if (!strncmp(buf, "u2", 2) &&
+		   param_exped(u3phy->u3phy_grf,
+			       &u3phy->cfgs->grfcfg.u2_only_ctrl, 0)) {
+		dev_info(u3phy->dev, "Set usb2.0 only mode successfully\n");
+
+		gpiod_set_value_cansleep(u3phy->vbus_drv_gpio, 0);
+
+		param_write(u3phy->grf,
+			    &u3phy->cfgs->grfcfg.u3_disable, true);
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.u2_only_ctrl, true);
+
+		for (index = 0; index < U3PHY_PORT_NUM; index++) {
+			u3phy_port = &u3phy->ports[index];
+			/* disable u3 rx termimation */
+			if (u3phy_port->type == U3PHY_TYPE_PIPE)
+				writel(0x20, u3phy_port->base + 0xd8);
+		}
+
+		atomic_notifier_call_chain(&u3phy->usb_phy.notifier, 0, NULL);
+
+		gpiod_set_value_cansleep(u3phy->vbus_drv_gpio, 1);
+	} else {
+		dev_info(u3phy->dev, "Same or illegal mode\n");
+	}
+
+	return count;
+}
+
+static const struct file_operations rockchip_u3phy_usb2_only_fops = {
+	.open			= rockchip_u3phy_usb2_only_open,
+	.write			= rockchip_u3phy_usb2_only_write,
+	.read			= seq_read,
+	.llseek			= seq_lseek,
+	.release		= single_release,
+};
+
+int rockchip_u3phy_debugfs_init(struct rockchip_u3phy *u3phy)
+{
+	struct dentry		*root;
+	struct dentry		*file;
+	int			ret;
+
+	root = debugfs_create_dir(dev_name(u3phy->dev), NULL);
+	if (!root) {
+		ret = -ENOMEM;
+		goto err0;
+	}
+
+	u3phy->root = root;
+
+	file = debugfs_create_file("u3phy_mode", 0644, root,
+				   u3phy, &rockchip_u3phy_usb2_only_fops);
+	if (!file) {
+		ret = -ENOMEM;
+		goto err1;
+	}
+	return 0;
+
+err1:
+	debugfs_remove_recursive(root);
+err0:
+	return ret;
+}
+
+static const char *get_rest_name(enum rockchip_u3phy_rest_req rst)
+{
+	switch (rst) {
+	case U2_POR_RSTN:
+		return "u3phy-u2-por";
+	case U3_POR_RSTN:
+		return "u3phy-u3-por";
+	case PIPE_MAC_RSTN:
+		return "u3phy-pipe-mac";
+	case UTMI_MAC_RSTN:
+		return "u3phy-utmi-mac";
+	case UTMI_APB_RSTN:
+		return "u3phy-utmi-apb";
+	case PIPE_APB_RSTN:
+		return "u3phy-pipe-apb";
+	default:
+		return "invalid";
+	}
+}
+
+static void rockchip_u3phy_rest_deassert(struct rockchip_u3phy *u3phy,
+					 unsigned int flag)
+{
+	int rst;
+
+	if (flag & U3PHY_APB_RST) {
+		dev_dbg(u3phy->dev, "deassert APB bus interface reset\n");
+		for (rst = PIPE_APB_RSTN; rst <= UTMI_APB_RSTN; rst++) {
+			if (u3phy->rsts[rst])
+				reset_control_deassert(u3phy->rsts[rst]);
+		}
+	}
+
+	if (flag & U3PHY_POR_RST) {
+		usleep_range(12, 15);
+		dev_dbg(u3phy->dev, "deassert u2 and u3 phy power on reset\n");
+		for (rst = U3_POR_RSTN; rst <= U2_POR_RSTN; rst++) {
+			if (u3phy->rsts[rst])
+				reset_control_deassert(u3phy->rsts[rst]);
+		}
+	}
+
+	if (flag & U3PHY_MAC_RST) {
+		usleep_range(1200, 1500);
+		dev_dbg(u3phy->dev, "deassert pipe and utmi MAC reset\n");
+		for (rst = PIPE_MAC_RSTN; rst <= UTMI_MAC_RSTN; rst++)
+			if (u3phy->rsts[rst])
+				reset_control_deassert(u3phy->rsts[rst]);
+	}
+}
+
+static void rockchip_u3phy_rest_assert(struct rockchip_u3phy *u3phy)
+{
+	int rst;
+
+	dev_dbg(u3phy->dev, "assert u3phy reset\n");
+	for (rst = 0; rst < U3PHY_RESET_MAX; rst++)
+		if (u3phy->rsts[rst])
+			reset_control_assert(u3phy->rsts[rst]);
+}
+
+static int rockchip_u3phy_clk_enable(struct rockchip_u3phy *u3phy)
+{
+	int ret, clk;
+
+	for (clk = 0; clk < u3phy->num_clocks && u3phy->clks[clk]; clk++) {
+		ret = clk_prepare_enable(u3phy->clks[clk]);
+		if (ret)
+			goto err_disable_clks;
+	}
+	return 0;
+
+err_disable_clks:
+	while (--clk >= 0)
+		clk_disable_unprepare(u3phy->clks[clk]);
+	return ret;
+}
+
+static void rockchip_u3phy_clk_disable(struct rockchip_u3phy *u3phy)
+{
+	int clk;
+
+	for (clk = u3phy->num_clocks - 1; clk >= 0; clk--)
+		if (u3phy->clks[clk])
+			clk_disable_unprepare(u3phy->clks[clk]);
+}
+
+static int rockchip_u3phy_init(struct phy *phy)
+{
+	return 0;
+}
+
+static int rockchip_u3phy_exit(struct phy *phy)
+{
+	return 0;
+}
+
+static int rockchip_u3phy_power_on(struct phy *phy)
+{
+	struct rockchip_u3phy_port *u3phy_port = phy_get_drvdata(phy);
+	struct rockchip_u3phy *u3phy = dev_get_drvdata(phy->dev.parent);
+	int ret;
+
+	dev_info(&u3phy_port->phy->dev, "u3phy %s power on\n",
+		 (u3phy_port->type == U3PHY_TYPE_UTMI) ? "u2" : "u3");
+
+	if (!u3phy_port->suspended)
+		return 0;
+
+	ret = rockchip_u3phy_clk_enable(u3phy);
+	if (ret)
+		return ret;
+
+	if (u3phy_port->type == U3PHY_TYPE_UTMI) {
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.um_suspend, false);
+	} else {
+		/* current in p2 ? */
+		if (param_exped(u3phy->u3phy_grf,
+				&u3phy->cfgs->grfcfg.pp_pwr_st, PIPE_PWR_P2))
+			goto done;
+
+		if (u3phy->cfgs->phy_pipe_power) {
+			dev_dbg(u3phy->dev, "do pipe power up\n");
+			u3phy->cfgs->phy_pipe_power(u3phy, u3phy_port, true);
+		}
+
+		/* exit to p0 */
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.pp_pwr_en[PIPE_PWR_P0], true);
+		usleep_range(90, 100);
+
+		/* enter to p2 from p0 */
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.pp_pwr_en[PIPE_PWR_P2],
+			    false);
+		udelay(3);
+	}
+
+done:
+	u3phy_port->suspended = false;
+	return 0;
+}
+
+static int rockchip_u3phy_power_off(struct phy *phy)
+{
+	struct rockchip_u3phy_port *u3phy_port = phy_get_drvdata(phy);
+	struct rockchip_u3phy *u3phy = dev_get_drvdata(phy->dev.parent);
+
+	dev_info(&u3phy_port->phy->dev, "u3phy %s power off\n",
+		 (u3phy_port->type == U3PHY_TYPE_UTMI) ? "u2" : "u3");
+
+	if (u3phy_port->suspended)
+		return 0;
+
+	if (u3phy_port->type == U3PHY_TYPE_UTMI) {
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.um_suspend, true);
+	} else {
+		/* current in p3 ? */
+		if (param_exped(u3phy->u3phy_grf,
+				&u3phy->cfgs->grfcfg.pp_pwr_st, PIPE_PWR_P3))
+			goto done;
+
+		/* exit to p0 */
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.pp_pwr_en[PIPE_PWR_P0], true);
+		udelay(2);
+
+		/* enter to p3 from p0 */
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.pp_pwr_en[PIPE_PWR_P3], true);
+		udelay(6);
+
+		if (u3phy->cfgs->phy_pipe_power) {
+			dev_dbg(u3phy->dev, "do pipe power down\n");
+			u3phy->cfgs->phy_pipe_power(u3phy, u3phy_port, false);
+		}
+	}
+
+done:
+	rockchip_u3phy_clk_disable(u3phy);
+	u3phy_port->suspended = true;
+	return 0;
+}
+
+static __maybe_unused
+struct phy *rockchip_u3phy_xlate(struct device *dev,
+				 struct of_phandle_args *args)
+{
+	struct rockchip_u3phy *u3phy = dev_get_drvdata(dev);
+	struct rockchip_u3phy_port *u3phy_port = NULL;
+	struct device_node *phy_np = args->np;
+	int index;
+
+	if (args->args_count != 1) {
+		dev_err(dev, "invalid number of cells in 'phy' property\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	for (index = 0; index < U3PHY_PORT_NUM; index++) {
+		if (phy_np == u3phy->ports[index].phy->dev.of_node) {
+			u3phy_port = &u3phy->ports[index];
+			break;
+		}
+	}
+
+	if (!u3phy_port) {
+		dev_err(dev, "failed to find appropriate phy\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	return u3phy_port->phy;
+}
+
+static struct phy_ops rockchip_u3phy_ops = {
+	.init		= rockchip_u3phy_init,
+	.exit		= rockchip_u3phy_exit,
+	.power_on	= rockchip_u3phy_power_on,
+	.power_off	= rockchip_u3phy_power_off,
+	.owner		= THIS_MODULE,
+};
+
+/*
+ * The function manage host-phy port state and suspend/resume phy port
+ * to save power automatically.
+ *
+ * we rely on utmi_linestate and utmi_hostdisconnect to identify whether
+ * devices is disconnect or not. Besides, we do not need care it is FS/LS
+ * disconnected or HS disconnected, actually, we just only need get the
+ * device is disconnected at last through rearm the delayed work,
+ * to suspend the phy port in _PHY_STATE_DISCONNECT_ case.
+ */
+static void rockchip_u3phy_um_sm_work(struct work_struct *work)
+{
+	struct rockchip_u3phy_port *u3phy_port =
+		container_of(work, struct rockchip_u3phy_port, um_sm_work.work);
+	struct rockchip_u3phy *u3phy =
+		dev_get_drvdata(u3phy_port->phy->dev.parent);
+	unsigned int sh = u3phy->cfgs->grfcfg.um_hstdct.bitend -
+			u3phy->cfgs->grfcfg.um_hstdct.bitstart + 1;
+	unsigned int ul, uhd, state;
+	unsigned int ul_mask, uhd_mask;
+	int ret;
+
+	mutex_lock(&u3phy_port->mutex);
+
+	ret = regmap_read(u3phy->u3phy_grf,
+			  u3phy->cfgs->grfcfg.um_ls.offset, &ul);
+	if (ret < 0)
+		goto next_schedule;
+
+	ret = regmap_read(u3phy->u3phy_grf,
+			  u3phy->cfgs->grfcfg.um_hstdct.offset, &uhd);
+	if (ret < 0)
+		goto next_schedule;
+
+	uhd_mask = GENMASK(u3phy->cfgs->grfcfg.um_hstdct.bitend,
+			   u3phy->cfgs->grfcfg.um_hstdct.bitstart);
+	ul_mask = GENMASK(u3phy->cfgs->grfcfg.um_ls.bitend,
+			  u3phy->cfgs->grfcfg.um_ls.bitstart);
+
+	/* stitch on um_ls and um_hstdct as phy state */
+	state = ((uhd & uhd_mask) >> u3phy->cfgs->grfcfg.um_hstdct.bitstart) |
+		(((ul & ul_mask) >> u3phy->cfgs->grfcfg.um_ls.bitstart) << sh);
+
+	switch (state) {
+	case PHY_UTMI_HS_ONLINE:
+		dev_dbg(&u3phy_port->phy->dev, "HS online\n");
+		break;
+	case PHY_UTMI_FS_LS_ONLINE:
+		/*
+		 * For FS/LS device, the online state share with connect state
+		 * from um_ls and um_hstdct register, so we distinguish
+		 * them via suspended flag.
+		 *
+		 * Plus, there are two cases, one is D- Line pull-up, and D+
+		 * line pull-down, the state is 4; another is D+ line pull-up,
+		 * and D- line pull-down, the state is 2.
+		 */
+		if (!u3phy_port->suspended) {
+			/* D- line pull-up, D+ line pull-down */
+			dev_dbg(&u3phy_port->phy->dev, "FS/LS online\n");
+			break;
+		}
+		/* fall through */
+	case PHY_UTMI_CONNECT:
+		if (u3phy_port->suspended) {
+			dev_dbg(&u3phy_port->phy->dev, "Connected\n");
+			rockchip_u3phy_power_on(u3phy_port->phy);
+			u3phy_port->suspended = false;
+		} else {
+			/* D+ line pull-up, D- line pull-down */
+			dev_dbg(&u3phy_port->phy->dev, "FS/LS online\n");
+		}
+		break;
+	case PHY_UTMI_DISCONNECT:
+		if (!u3phy_port->suspended) {
+			dev_dbg(&u3phy_port->phy->dev, "Disconnected\n");
+			rockchip_u3phy_power_off(u3phy_port->phy);
+			u3phy_port->suspended = true;
+		}
+
+		/*
+		 * activate the linestate detection to get the next device
+		 * plug-in irq.
+		 */
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.ls_det_st, true);
+		param_write(u3phy->u3phy_grf,
+			    &u3phy->cfgs->grfcfg.ls_det_en, true);
+
+		/*
+		 * we don't need to rearm the delayed work when the phy port
+		 * is suspended.
+		 */
+		mutex_unlock(&u3phy_port->mutex);
+		return;
+	default:
+		dev_dbg(&u3phy_port->phy->dev, "unknown phy state\n");
+		break;
+	}
+
+next_schedule:
+	mutex_unlock(&u3phy_port->mutex);
+	schedule_delayed_work(&u3phy_port->um_sm_work, SCHEDULE_DELAY);
+}
+
+static irqreturn_t rockchip_u3phy_um_ls_irq(int irq, void *data)
+{
+	struct rockchip_u3phy_port *u3phy_port = data;
+	struct rockchip_u3phy *u3phy =
+		dev_get_drvdata(u3phy_port->phy->dev.parent);
+
+	if (!param_exped(u3phy->u3phy_grf,
+			 &u3phy->cfgs->grfcfg.ls_det_st,
+			 u3phy->cfgs->grfcfg.ls_det_st.dvalue))
+		return IRQ_NONE;
+
+	dev_dbg(u3phy->dev, "utmi linestate interrupt\n");
+	mutex_lock(&u3phy_port->mutex);
+
+	/* disable linestate detect irq and clear its status */
+	param_write(u3phy->u3phy_grf, &u3phy->cfgs->grfcfg.ls_det_en, false);
+	param_write(u3phy->u3phy_grf, &u3phy->cfgs->grfcfg.ls_det_st, true);
+
+	mutex_unlock(&u3phy_port->mutex);
+
+	/*
+	 * In this case for host phy, a new device is plugged in, meanwhile,
+	 * if the phy port is suspended, we need rearm the work to resume it
+	 * and mange its states; otherwise, we just return irq handled.
+	 */
+	if (u3phy_port->suspended) {
+		dev_dbg(u3phy->dev, "schedule utmi sm work\n");
+		rockchip_u3phy_um_sm_work(&u3phy_port->um_sm_work.work);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int rockchip_u3phy_parse_dt(struct rockchip_u3phy *u3phy,
+				   struct platform_device *pdev)
+
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	int ret, i, clk;
+
+	u3phy->um_ls_irq = platform_get_irq_byname(pdev, "linestate");
+	if (u3phy->um_ls_irq < 0) {
+		dev_err(dev, "get utmi linestate irq failed\n");
+		return -ENXIO;
+	}
+
+	u3phy->vbus_drv_gpio = devm_gpiod_get_optional(dev, "vbus-drv",
+						       GPIOD_OUT_HIGH);
+
+	if (!u3phy->vbus_drv_gpio) {
+		dev_warn(&pdev->dev, "vbus_drv is not assigned\n");
+	} else if (IS_ERR(u3phy->vbus_drv_gpio)) {
+		dev_err(&pdev->dev, "failed to get vbus_drv\n");
+		return PTR_ERR(u3phy->vbus_drv_gpio);
+	}
+
+	u3phy->num_clocks = of_clk_get_parent_count(np);
+	if (u3phy->num_clocks == 0)
+		dev_warn(&pdev->dev, "no clks found in dt\n");
+
+	u3phy->clks = devm_kcalloc(dev, u3phy->num_clocks,
+				  sizeof(struct clk *), GFP_KERNEL);
+
+	for (clk = 0; clk < u3phy->num_clocks; clk++) {
+		u3phy->clks[clk] = of_clk_get(np, clk);
+		if (IS_ERR(u3phy->clks[clk])) {
+			ret = PTR_ERR(u3phy->clks[clk]);
+			if (ret == -EPROBE_DEFER)
+				goto err_put_clks;
+			dev_err(&pdev->dev, "failed to get clks, %i\n",
+				ret);
+			u3phy->clks[clk] = NULL;
+			break;
+		}
+	}
+
+	for (i = 0; i < U3PHY_RESET_MAX; i++) {
+		u3phy->rsts[i] = devm_reset_control_get(dev, get_rest_name(i));
+		if (IS_ERR(u3phy->rsts[i])) {
+			dev_info(dev, "no %s reset control specified\n",
+				 get_rest_name(i));
+			u3phy->rsts[i] = NULL;
+		}
+	}
+
+	return 0;
+
+err_put_clks:
+	while (--clk >= 0)
+		clk_put(u3phy->clks[clk]);
+	return ret;
+}
+
+static int rockchip_u3phy_port_init(struct rockchip_u3phy *u3phy,
+				    struct rockchip_u3phy_port *u3phy_port,
+				    struct device_node *child_np)
+{
+	struct resource res;
+	struct phy *phy;
+	int ret;
+
+	dev_dbg(u3phy->dev, "u3phy port initialize\n");
+
+	mutex_init(&u3phy_port->mutex);
+	u3phy_port->suspended = true; /* initial status */
+
+	phy = devm_phy_create(u3phy->dev, child_np, &rockchip_u3phy_ops);
+	if (IS_ERR(phy)) {
+		dev_err(u3phy->dev, "failed to create phy\n");
+		return PTR_ERR(phy);
+	}
+
+	u3phy_port->phy = phy;
+
+	ret = of_address_to_resource(child_np, 0, &res);
+	if (ret) {
+		dev_err(u3phy->dev, "failed to get address resource(np-%s)\n",
+			child_np->name);
+		return ret;
+	}
+
+	u3phy_port->base = devm_ioremap_resource(&u3phy_port->phy->dev, &res);
+	if (IS_ERR(u3phy_port->base)) {
+		dev_err(u3phy->dev, "failed to remap phy regs\n");
+		return PTR_ERR(u3phy_port->base);
+	}
+
+	if (!of_node_cmp(child_np->name, "pipe")) {
+		u3phy_port->type = U3PHY_TYPE_PIPE;
+		u3phy_port->refclk_25m_quirk =
+			of_property_read_bool(child_np,
+					      "rockchip,refclk-25m-quirk");
+	} else {
+		u3phy_port->type = U3PHY_TYPE_UTMI;
+		INIT_DELAYED_WORK(&u3phy_port->um_sm_work,
+				  rockchip_u3phy_um_sm_work);
+
+		ret = devm_request_threaded_irq(u3phy->dev, u3phy->um_ls_irq,
+						NULL, rockchip_u3phy_um_ls_irq,
+						IRQF_ONESHOT, "rockchip_u3phy",
+						u3phy_port);
+		if (ret) {
+			dev_err(u3phy->dev, "failed to request utmi linestate irq handle\n");
+			return ret;
+		}
+	}
+
+	if (u3phy->cfgs->phy_tuning) {
+		dev_dbg(u3phy->dev, "do u3phy tuning\n");
+		ret = u3phy->cfgs->phy_tuning(u3phy, u3phy_port, child_np);
+		if (ret)
+			return ret;
+	}
+
+	phy_set_drvdata(u3phy_port->phy, u3phy_port);
+	return 0;
+}
+
+static int rockchip_u3phy_on_init(struct usb_phy *usb_phy)
+{
+	struct rockchip_u3phy *u3phy =
+		container_of(usb_phy, struct rockchip_u3phy, usb_phy);
+
+	rockchip_u3phy_rest_deassert(u3phy, U3PHY_POR_RST | U3PHY_MAC_RST);
+	return 0;
+}
+
+static void rockchip_u3phy_on_shutdown(struct usb_phy *usb_phy)
+{
+	struct rockchip_u3phy *u3phy =
+		container_of(usb_phy, struct rockchip_u3phy, usb_phy);
+	int rst;
+
+	for (rst = 0; rst < U3PHY_RESET_MAX; rst++)
+		if (u3phy->rsts[rst] && rst != UTMI_APB_RSTN &&
+		    rst != PIPE_APB_RSTN)
+			reset_control_assert(u3phy->rsts[rst]);
+	udelay(1);
+}
+
+static int rockchip_u3phy_on_disconnect(struct usb_phy *usb_phy,
+					enum usb_device_speed speed)
+{
+	struct rockchip_u3phy *u3phy =
+		container_of(usb_phy, struct rockchip_u3phy, usb_phy);
+
+	dev_info(u3phy->dev, "%s device has disconnected\n",
+		 (speed == USB_SPEED_SUPER) ? "U3" : "UW/U2/U1.1/U1");
+
+	if (speed == USB_SPEED_SUPER)
+		atomic_notifier_call_chain(&usb_phy->notifier, 0, NULL);
+
+	return 0;
+}
+
+static int rockchip_u3phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct device_node *child_np;
+	struct phy_provider *provider;
+	struct rockchip_u3phy *u3phy;
+	const struct rockchip_u3phy_cfg *phy_cfgs;
+	const struct of_device_id *match;
+	unsigned int reg[2];
+	int index, ret;
+
+	match = of_match_device(dev->driver->of_match_table, dev);
+	if (!match || !match->data) {
+		dev_err(dev, "phy-cfgs are not assigned!\n");
+		return -EINVAL;
+	}
+
+	u3phy = devm_kzalloc(dev, sizeof(*u3phy), GFP_KERNEL);
+	if (!u3phy)
+		return -ENOMEM;
+
+	u3phy->u3phy_grf =
+		syscon_regmap_lookup_by_phandle(np, "rockchip,u3phygrf");
+	if (IS_ERR(u3phy->u3phy_grf))
+		return PTR_ERR(u3phy->u3phy_grf);
+
+	u3phy->grf =
+		syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
+	if (IS_ERR(u3phy->grf)) {
+		dev_err(dev, "Missing rockchip,grf property\n");
+		return PTR_ERR(u3phy->grf);
+	}
+
+	if (of_property_read_u32_array(np, "reg", reg, 2)) {
+		dev_err(dev, "the reg property is not assigned in %s node\n",
+			np->name);
+		return -EINVAL;
+	}
+
+	u3phy->dev = dev;
+	phy_cfgs = match->data;
+	platform_set_drvdata(pdev, u3phy);
+
+	/* find out a proper config which can be matched with dt. */
+	index = 0;
+	while (phy_cfgs[index].reg) {
+		if (phy_cfgs[index].reg == reg[1]) {
+			u3phy->cfgs = &phy_cfgs[index];
+			break;
+		}
+
+		++index;
+	}
+
+	if (!u3phy->cfgs) {
+		dev_err(dev, "no phy-cfgs can be matched with %s node\n",
+			np->name);
+		return -EINVAL;
+	}
+
+	ret = rockchip_u3phy_parse_dt(u3phy, pdev);
+	if (ret) {
+		dev_err(dev, "parse dt failed, ret(%d)\n", ret);
+		return ret;
+	}
+
+	ret = rockchip_u3phy_clk_enable(u3phy);
+	if (ret) {
+		dev_err(dev, "clk enable failed, ret(%d)\n", ret);
+		return ret;
+	}
+
+	rockchip_u3phy_rest_assert(u3phy);
+	rockchip_u3phy_rest_deassert(u3phy, U3PHY_APB_RST | U3PHY_POR_RST);
+
+	index = 0;
+	for_each_available_child_of_node(np, child_np) {
+		struct rockchip_u3phy_port *u3phy_port = &u3phy->ports[index];
+
+		u3phy_port->index = index;
+		ret = rockchip_u3phy_port_init(u3phy, u3phy_port, child_np);
+		if (ret) {
+			dev_err(dev, "u3phy port init failed,ret(%d)\n", ret);
+			goto put_child;
+		}
+
+		/* to prevent out of boundary */
+		if (++index >= U3PHY_PORT_NUM)
+			break;
+	}
+
+	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	if (IS_ERR_OR_NULL(provider))
+		goto put_child;
+
+	rockchip_u3phy_rest_deassert(u3phy, U3PHY_MAC_RST);
+	rockchip_u3phy_clk_disable(u3phy);
+
+	u3phy->usb_phy.dev = dev;
+	u3phy->usb_phy.init = rockchip_u3phy_on_init;
+	u3phy->usb_phy.shutdown = rockchip_u3phy_on_shutdown;
+	u3phy->usb_phy.notify_disconnect = rockchip_u3phy_on_disconnect;
+	usb_add_phy(&u3phy->usb_phy, USB_PHY_TYPE_USB3);
+	ATOMIC_INIT_NOTIFIER_HEAD(&u3phy->usb_phy.notifier);
+
+	rockchip_u3phy_debugfs_init(u3phy);
+
+	dev_info(dev, "Rockchip u3phy initialized successfully\n");
+	return 0;
+
+put_child:
+	of_node_put(child_np);
+	return ret;
+}
+
+static int rk3328_u3phy_pipe_power(struct rockchip_u3phy *u3phy,
+				   struct rockchip_u3phy_port *u3phy_port,
+				   bool on)
+{
+	unsigned int reg;
+
+	if (on) {
+		reg = readl(u3phy_port->base + 0x1a8);
+		reg &= ~BIT(4); /* ldo power up */
+		writel(reg, u3phy_port->base + 0x1a8);
+
+		reg = readl(u3phy_port->base + 0x044);
+		reg &= ~BIT(4); /* bg power on */
+		writel(reg, u3phy_port->base + 0x044);
+
+		reg = readl(u3phy_port->base + 0x150);
+		reg |= BIT(6); /* tx bias enable */
+		writel(reg, u3phy_port->base + 0x150);
+
+		reg = readl(u3phy_port->base + 0x080);
+		reg &= ~BIT(2); /* tx cm power up */
+		writel(reg, u3phy_port->base + 0x080);
+
+		reg = readl(u3phy_port->base + 0x0c0);
+		/* tx obs enable and rx cm enable */
+		reg |= (BIT(3) | BIT(4));
+		writel(reg, u3phy_port->base + 0x0c0);
+
+		udelay(1);
+	} else {
+		reg = readl(u3phy_port->base + 0x1a8);
+		reg |= BIT(4); /* ldo power down */
+		writel(reg, u3phy_port->base + 0x1a8);
+
+		reg = readl(u3phy_port->base + 0x044);
+		reg |= BIT(4); /* bg power down */
+		writel(reg, u3phy_port->base + 0x044);
+
+		reg = readl(u3phy_port->base + 0x150);
+		reg &= ~BIT(6); /* tx bias disable */
+		writel(reg, u3phy_port->base + 0x150);
+
+		reg = readl(u3phy_port->base + 0x080);
+		reg |= BIT(2); /* tx cm power down */
+		writel(reg, u3phy_port->base + 0x080);
+
+		reg = readl(u3phy_port->base + 0x0c0);
+		/* tx obs disable and rx cm disable */
+		reg &= ~(BIT(3) | BIT(4));
+		writel(reg, u3phy_port->base + 0x0c0);
+	}
+
+	return 0;
+}
+
+static int rk3328_u3phy_tuning(struct rockchip_u3phy *u3phy,
+			       struct rockchip_u3phy_port *u3phy_port,
+			       struct device_node *child_np)
+{
+	if (u3phy_port->type == U3PHY_TYPE_UTMI) {
+		/*
+		 * For rk3328 SoC, pre-emphasis and pre-emphasis strength must
+		 * be written as one fixed value as below.
+		 *
+		 * Dissimilarly, the odt 45ohm value should be flexibly tuninged
+		 * for the different boards to adjust HS eye height, so its
+		 * value can be assigned in DT in code design.
+		 */
+
+		/* {bits[2:0]=111}: always enable pre-emphasis */
+		u3phy->apbcfg.u2_pre_emp = 0x0f;
+
+		/* {bits[5:3]=000}: pre-emphasis strength as the weakest */
+		u3phy->apbcfg.u2_pre_emp_sth = 0x41;
+
+		/* {bits[4:0]=10101}: odt 45ohm tuning */
+		u3phy->apbcfg.u2_odt_tuning = 0xb5;
+		/* optional override of the odt 45ohm tuning */
+		of_property_read_u32(child_np, "rockchip,odt-val-tuning",
+				     &u3phy->apbcfg.u2_odt_tuning);
+
+		writel(u3phy->apbcfg.u2_pre_emp, u3phy_port->base + 0x030);
+		writel(u3phy->apbcfg.u2_pre_emp_sth, u3phy_port->base + 0x040);
+		writel(u3phy->apbcfg.u2_odt_tuning, u3phy_port->base + 0x11c);
+	} else if (u3phy_port->type == U3PHY_TYPE_PIPE) {
+		if (u3phy_port->refclk_25m_quirk) {
+			dev_dbg(u3phy->dev, "switch to 25m refclk\n");
+			/* ref clk switch to 25M */
+			writel(0x64, u3phy_port->base + 0x11c);
+			writel(0x64, u3phy_port->base + 0x028);
+			writel(0x01, u3phy_port->base + 0x020);
+			writel(0x21, u3phy_port->base + 0x030);
+			writel(0x06, u3phy_port->base + 0x108);
+			writel(0x00, u3phy_port->base + 0x118);
+		} else {
+			/* configure for 24M ref clk */
+			writel(0x80, u3phy_port->base + 0x10c);
+			writel(0x01, u3phy_port->base + 0x118);
+			writel(0x38, u3phy_port->base + 0x11c);
+			writel(0x83, u3phy_port->base + 0x020);
+			writel(0x02, u3phy_port->base + 0x108);
+		}
+
+		/* Enable SSC */
+		udelay(3);
+		writel(0x08, u3phy_port->base + 0x000);
+		writel(0x0c, u3phy_port->base + 0x120);
+
+		/* Tuning Rx for compliance RJTL test */
+		writel(0x70, u3phy_port->base + 0x150);
+		writel(0x12, u3phy_port->base + 0x0c8);
+		writel(0x05, u3phy_port->base + 0x148);
+		writel(0x08, u3phy_port->base + 0x068);
+		writel(0xf0, u3phy_port->base + 0x1c4);
+		writel(0xff, u3phy_port->base + 0x070);
+		writel(0x0f, u3phy_port->base + 0x06c);
+		writel(0xe0, u3phy_port->base + 0x060);
+
+		/*
+		 * Tuning Tx to increase the bias current
+		 * used in TX driver and RX EQ, it can
+		 * also increase the voltage of LFPS.
+		 */
+		writel(0x08, u3phy_port->base + 0x180);
+	} else {
+		dev_err(u3phy->dev, "invalid u3phy port type\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct rockchip_u3phy_cfg rk3328_u3phy_cfgs[] = {
+	{
+		.reg		= 0xff470000,
+		.grfcfg		= {
+			.um_suspend	= { 0x0004, 15, 0, 0x1452, 0x15d1 },
+			.u2_only_ctrl	= { 0x0020, 15, 15, 0, 1 },
+			.um_ls		= { 0x0030, 5, 4, 0, 1 },
+			.um_hstdct	= { 0x0030, 7, 7, 0, 1 },
+			.ls_det_en	= { 0x0040, 0, 0, 0, 1 },
+			.ls_det_st	= { 0x0044, 0, 0, 0, 1 },
+			.pp_pwr_st	= { 0x0034, 14, 13, 0, 0},
+			.pp_pwr_en	= { {0x0020, 14, 0, 0x0014, 0x0005},
+					    {0x0020, 14, 0, 0x0014, 0x000d},
+					    {0x0020, 14, 0, 0x0014, 0x0015},
+					    {0x0020, 14, 0, 0x0014, 0x001d} },
+			.u3_disable	= { 0x04c4, 15, 0, 0x1100, 0x101},
+		},
+		.phy_pipe_power	= rk3328_u3phy_pipe_power,
+		.phy_tuning	= rk3328_u3phy_tuning,
+	},
+	{ /* sentinel */ }
+};
+
+static const struct of_device_id rockchip_u3phy_dt_match[] = {
+	{ .compatible = "rockchip,rk3328-u3phy", .data = &rk3328_u3phy_cfgs },
+	{}
+};
+MODULE_DEVICE_TABLE(of, rockchip_u3phy_dt_match);
+
+static struct platform_driver rockchip_u3phy_driver = {
+	.probe		= rockchip_u3phy_probe,
+	.driver		= {
+		.name	= "rockchip-u3phy",
+		.of_match_table = rockchip_u3phy_dt_match,
+	},
+};
+module_platform_driver(rockchip_u3phy_driver);
+
+MODULE_AUTHOR("Frank Wang <frank.wang@rock-chips.com>");
+MODULE_AUTHOR("William Wu <william.wu@rock-chips.com>");
+MODULE_DESCRIPTION("Rockchip USB 3.0 PHY driver");
+MODULE_LICENSE("GPL v2");
-- 
2.20.1