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Message-ID: <20230802011400.v4jim6ajsqc3tvei@synopsys.com>
Date:   Wed, 2 Aug 2023 01:14:09 +0000
From:   Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To:     Stanley Chang <stanley_chang@...ltek.com>
CC:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] usb: dwc3: add Realtek DHC RTD SoC dwc3 glue layer
 driver

Hi,

On Tue, Aug 01, 2023, Stanley Chang wrote:
> Realtek DHC RTD SoCs integrate dwc3 IP and has some customizations to
> support different generations of SoCs.
> 
> Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
> ---
> v1 to v2 change:
>     Remove the the code about the property realtek,enable-l4icg.
>     Select USB_ROLE_SWITCH in Kconfig.
>     Add dependency OF and ARCH_REALTEK in Kconfig.
> ---
>  drivers/usb/dwc3/Kconfig    |  12 +
>  drivers/usb/dwc3/Makefile   |   1 +
>  drivers/usb/dwc3/dwc3-rtk.c | 499 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 512 insertions(+)
>  create mode 100644 drivers/usb/dwc3/dwc3-rtk.c
> 
> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
> index be954a9abbe0..baa6a38b2f13 100644
> --- a/drivers/usb/dwc3/Kconfig
> +++ b/drivers/usb/dwc3/Kconfig
> @@ -168,4 +168,16 @@ config USB_DWC3_AM62
>  	  The Designware Core USB3 IP is programmed to operate in
>  	  in USB 2.0 mode only.
>  	  Say 'Y' or 'M' here if you have one such device
> +
> +config USB_DWC3_RTK
> +	tristate "Realtek DWC3 Platform Driver"
> +	depends on OF && ARCH_REALTEK
> +	default USB_DWC3
> +	select USB_ROLE_SWITCH
> +	help
> +	  RTK DHC RTD SoCs with DesignWare Core USB3 IP inside,
> +	  and IP Core configured for USB 2.0 and USB 3.0 in host
> +	  or dual-role mode.
> +	  Say 'Y' or 'M' if you have such device.
> +
>  endif
> diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile
> index 9f66bd82b639..38d19e4369a5 100644
> --- a/drivers/usb/dwc3/Makefile
> +++ b/drivers/usb/dwc3/Makefile
> @@ -54,3 +54,4 @@ obj-$(CONFIG_USB_DWC3_ST)		+= dwc3-st.o
>  obj-$(CONFIG_USB_DWC3_QCOM)		+= dwc3-qcom.o
>  obj-$(CONFIG_USB_DWC3_IMX8MP)		+= dwc3-imx8mp.o
>  obj-$(CONFIG_USB_DWC3_XILINX)		+= dwc3-xilinx.o
> +obj-$(CONFIG_USB_DWC3_RTK)		+= dwc3-rtk.o
> diff --git a/drivers/usb/dwc3/dwc3-rtk.c b/drivers/usb/dwc3/dwc3-rtk.c
> new file mode 100644
> index 000000000000..5c2b2f4e422d
> --- /dev/null
> +++ b/drivers/usb/dwc3/dwc3-rtk.c
> @@ -0,0 +1,499 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * dwc3-rtk.c - Realtek DWC3 Specific Glue layer
> + *
> + * Copyright (C) 2023 Realtek Semiconductor Corporation
> + *
> + */
> +
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/suspend.h>
> +#include <linux/sys_soc.h>
> +#include <linux/usb/otg.h>
> +#include <linux/usb/of.h>
> +#include <linux/usb/role.h>
> +
> +#include "core.h"
> +
> +#define WRAP_CTR_REG  0x0
> +#define DISABLE_MULTI_REQ BIT(1)
> +#define DESC_R2W_MULTI_DISABLE BIT(9)
> +#define FORCE_PIPE3_PHY_STATUS_TO_0 BIT(13)
> +
> +#define WRAP_USB2_PHY_UTMI_REG 0x8
> +#define TXHSVM_EN BIT(3)
> +
> +#define WRAP_PHY_PIPE_REG 0xC
> +#define RESET_DISABLE_PIPE3_P0 BIT(0)
> +#define CLOCK_ENABLE_FOR_PIPE3_PCLK BIT(1)
> +
> +#define WRAP_USB_HMAC_CTR0_REG 0x60
> +#define U3PORT_DIS BIT(8)
> +
> +#define WRAP_USB2_PHY_REG  0x70
> +#define USB2_PHY_EN_PHY_PLL_PORT0 BIT(12)
> +#define USB2_PHY_EN_PHY_PLL_PORT1 BIT(13)
> +#define USB2_PHY_SWITCH_MASK 0x707
> +#define USB2_PHY_SWITCH_DEVICE 0x0
> +#define USB2_PHY_SWITCH_HOST 0x606
> +
> +#define WRAP_APHY_REG 0x128
> +#define USB3_MBIAS_ENABLE BIT(1)
> +
> +#define WRAP_USB_DBUS_PWR_CTRL_REG 0x160
> +#define DBUS_PWR_CTRL_EN BIT(0)
> +
> +struct dwc3_rtk {
> +	struct device *dev;
> +	void __iomem *regs;
> +	size_t regs_size;
> +
> +	struct dwc3 *dwc;
> +
> +	int cur_dr_mode; /* current dr mode */
> +	bool support_drd_mode; /* if support Host/device switch */

I think we may not need this and do away the boolean support_drd_mode.

> +	struct usb_role_switch *role_switch;
> +
> +	bool unlink_usb3_port;
> +	bool disable_usb3_phy;
> +};
> +
> +static void switch_usb2_dr_mode(struct dwc3_rtk *rtk, int dr_mode)
> +{
> +	switch (dr_mode) {
> +	case USB_DR_MODE_PERIPHERAL:
> +		writel(USB2_PHY_SWITCH_DEVICE |
> +			    (~USB2_PHY_SWITCH_MASK &
> +			      readl(rtk->regs + WRAP_USB2_PHY_REG)),
> +			    rtk->regs + WRAP_USB2_PHY_REG);
> +		break;
> +	case USB_DR_MODE_HOST:
> +		writel(USB2_PHY_SWITCH_HOST |
> +			    (~USB2_PHY_SWITCH_MASK &
> +			      readl(rtk->regs + WRAP_USB2_PHY_REG)),
> +			    rtk->regs + WRAP_USB2_PHY_REG);
> +		break;
> +	default:
> +		dev_dbg(rtk->dev, "%s: dr_mode=%d\n", __func__, dr_mode);
> +		break;
> +	}
> +}
> +
> +static void switch_dwc3_dr_mode(struct dwc3_rtk *rtk, int dr_mode)
> +{
> +	if (!rtk->dwc->role_sw)
> +		goto out;
> +
> +	switch (dr_mode) {
> +	case USB_DR_MODE_PERIPHERAL:
> +		usb_role_switch_set_role(rtk->dwc->role_sw, USB_ROLE_DEVICE);
> +		break;
> +	case USB_DR_MODE_HOST:
> +		usb_role_switch_set_role(rtk->dwc->role_sw, USB_ROLE_HOST);
> +		break;
> +	default:
> +		dev_dbg(rtk->dev, "%s dr_mode=%d\n", __func__, dr_mode);
> +		break;
> +	}
> +
> +out:
> +	return;
> +}
> +
> +static int dwc3_rtk_get_dr_mode(struct dwc3_rtk *rtk)
> +{
> +	enum usb_role role;
> +
> +	role = rtk->cur_dr_mode;
> +
> +	if (rtk->dwc && rtk->dwc->role_sw)
> +		role = usb_role_switch_get_role(rtk->dwc->role_sw);
> +	else
> +		dev_dbg(rtk->dev, "%s not usb_role_switch role=%d\n", __func__, role);
> +
> +	return role;
> +}
> +
> +static int dwc3_rtk_set_dr_mode(struct dwc3_rtk *rtk, int dr_mode)

Why return the mode rather than status if the setting? You're not
checking the return of this function in the caller anyway.

> +{
> +	if (!rtk->support_drd_mode)
> +		return rtk->cur_dr_mode;
> +
> +	rtk->cur_dr_mode = dr_mode;
> +
> +	switch_dwc3_dr_mode(rtk, dr_mode);
> +	mdelay(10);
> +	switch_usb2_dr_mode(rtk, dr_mode);
> +
> +	return rtk->cur_dr_mode;
> +}
> +
> +#if IS_ENABLED(CONFIG_USB_ROLE_SWITCH)
> +static int dwc3_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role role)
> +{
> +	struct dwc3_rtk *rtk = usb_role_switch_get_drvdata(sw);
> +
> +	switch (role) {
> +	case USB_ROLE_HOST:
> +		dwc3_rtk_set_dr_mode(rtk, USB_DR_MODE_HOST);
> +		break;
> +	case USB_ROLE_DEVICE:
> +		dwc3_rtk_set_dr_mode(rtk, USB_DR_MODE_PERIPHERAL);
> +		break;
> +	default:
> +		dwc3_rtk_set_dr_mode(rtk, 0);
> +	}
> +
> +	return 0;
> +}
> +
> +static enum usb_role dwc3_usb_role_switch_get(struct usb_role_switch *sw)
> +{
> +	struct dwc3_rtk *rtk = usb_role_switch_get_drvdata(sw);
> +	enum usb_role role = USB_ROLE_NONE;
> +	int dr_mode;
> +
> +	dr_mode = dwc3_rtk_get_dr_mode(rtk);
> +	switch (dr_mode) {
> +	case USB_DR_MODE_HOST:
> +		role = USB_ROLE_HOST;
> +		break;
> +	case USB_DR_MODE_PERIPHERAL:
> +		role = USB_ROLE_DEVICE;
> +		break;
> +	default:
> +		dev_dbg(rtk->dev, "%s dr_mode=%d", __func__, dr_mode);
> +		break;
> +	}
> +	return role;
> +}
> +
> +static int dwc3_rtk_setup_role_switch(struct dwc3_rtk *rtk)

Any reason why we're doing the role switch here and not what's
implemented from the core?

> +{
> +	struct usb_role_switch_desc dwc3_role_switch = {NULL};
> +
> +	dwc3_role_switch.name = strchrnul(dev_name(rtk->dev), '.') + 1;
> +	dwc3_role_switch.driver_data = rtk;
> +	dwc3_role_switch.allow_userspace_control = true;
> +	dwc3_role_switch.fwnode = dev_fwnode(rtk->dev);
> +	dwc3_role_switch.set = dwc3_usb_role_switch_set;
> +	dwc3_role_switch.get = dwc3_usb_role_switch_get;
> +	rtk->role_switch = usb_role_switch_register(rtk->dev, &dwc3_role_switch);
> +	if (IS_ERR(rtk->role_switch))
> +		return PTR_ERR(rtk->role_switch);
> +
> +	return 0;
> +}
> +
> +static int dwc3_rtk_remove_role_switch(struct dwc3_rtk *rtk)
> +{
> +	if (rtk->role_switch)
> +		usb_role_switch_unregister(rtk->role_switch);
> +
> +	rtk->role_switch = NULL;
> +
> +	return 0;
> +}
> +#else
> +#define dwc3_rtk_setup_role_switch(x) 0
> +#define dwc3_rtk_remove_role_switch(x) 0
> +#endif
> +
> +static int dwc3_rtk_init(struct dwc3_rtk *rtk)
> +{
> +	struct device *dev = rtk->dev;
> +	void __iomem *regs = rtk->regs;
> +	const struct soc_device_attribute rtk_soc_kylin_a00[] = {
> +		{ .family = "Realtek Kylin", .revision = "A00", },
> +		{ /* empty */ } };
> +	const struct soc_device_attribute rtk_soc_kylin[] = {
> +		{ .family = "Realtek Kylin", }, { /* empty */ } };
> +	const struct soc_device_attribute rtk_soc_hercules[] = {
> +		{ .family = "Realtek Hercules", }, { /* empty */ } };
> +	const struct soc_device_attribute rtk_soc_hw_clock_gating_quirk[] = {
> +		{ .family = "Realtek Kylin", },
> +		{ .family = "Realtek Hercules", },
> +		{ .family = "Realtek Thor", },
> +		{ .family = "Realtek Hank", },
> +		{ .family = "Realtek Groot", },
> +		{ .family = "Realtek Stark", },
> +		{ /* empty */ } };
> +
> +	if (soc_device_match(rtk_soc_kylin_a00)) {
> +		writel(DISABLE_MULTI_REQ | readl(regs + WRAP_CTR_REG),
> +		       regs + WRAP_CTR_REG);
> +		dev_info(dev, "[bug fixed] 1295/1296 A00: add workaround to disable multiple request for D-Bus");
> +	}
> +
> +	if (soc_device_match(rtk_soc_hercules)) {
> +		writel(USB2_PHY_EN_PHY_PLL_PORT1 |
> +		       readl(regs + WRAP_USB2_PHY_REG),
> +		       regs + WRAP_USB2_PHY_REG);
> +		dev_info(dev, "[bug fixed] 1395 add workaround to disable usb2 port 2 suspend!");
> +	}
> +
> +	writel(TXHSVM_EN | readl(regs + WRAP_USB2_PHY_UTMI_REG),
> +	       regs + WRAP_USB2_PHY_UTMI_REG);
> +
> +	if (rtk->unlink_usb3_port) {
> +		void __iomem *reg;
> +		int val;
> +
> +		reg =  rtk->regs + WRAP_USB_HMAC_CTR0_REG;
> +		val = U3PORT_DIS | readl(reg);
> +		writel(val, reg);
> +	}
> +
> +	if (rtk->disable_usb3_phy) {
> +		void __iomem *reg;
> +		int val;
> +
> +		reg = rtk->regs + WRAP_CTR_REG;
> +		val = FORCE_PIPE3_PHY_STATUS_TO_0 | readl(reg);
> +		writel(val, reg);
> +
> +		reg = rtk->regs + WRAP_PHY_PIPE_REG;
> +		val = ~CLOCK_ENABLE_FOR_PIPE3_PCLK & readl(reg);
> +		val |= RESET_DISABLE_PIPE3_P0;
> +		writel(val, reg);
> +
> +		reg =  rtk->regs + WRAP_USB_HMAC_CTR0_REG;
> +		val = U3PORT_DIS | readl(reg);
> +		writel(val, reg);
> +
> +		reg = rtk->regs + WRAP_APHY_REG;
> +		val = ~USB3_MBIAS_ENABLE & readl(reg);
> +		writel(val, reg);
> +
> +		dev_info(rtk->dev, "%s: disable usb 3.0 phy\n", __func__);
> +	}
> +
> +	if (!soc_device_match(rtk_soc_kylin)) {
> +		void __iomem *reg;
> +		int val;
> +
> +		reg = rtk->regs + WRAP_USB_DBUS_PWR_CTRL_REG;
> +		if (soc_device_match(rtk_soc_hw_clock_gating_quirk))
> +			reg += 0x4;
> +
> +		val = DBUS_PWR_CTRL_EN | readl(reg);
> +		writel(val, reg);
> +	}
> +
> +	writel(DESC_R2W_MULTI_DISABLE | readl(regs + WRAP_CTR_REG),
> +	       regs + WRAP_CTR_REG);
> +
> +	/* Set phy Dp/Dm initial state to host mode to avoid the Dp glitch */
> +	writel(USB2_PHY_SWITCH_HOST |
> +	       (~USB2_PHY_SWITCH_MASK &
> +	       readl(rtk->regs + WRAP_USB2_PHY_REG)),
> +	       rtk->regs + WRAP_USB2_PHY_REG);
> +
> +	return 0;
> +}
> +
> +static int dwc3_rtk_probe_dwc3_core(struct dwc3_rtk *rtk)
> +{
> +	struct device *dev = rtk->dev;
> +	struct device_node *node = dev->of_node;
> +	struct platform_device *dwc3_pdev;
> +	struct device *dwc3_dev;
> +	struct device_node *dwc3_node;
> +	int dr_mode;
> +	int ret = 0;
> +
> +	ret = dwc3_rtk_init(rtk);
> +	if (ret)
> +		return -EINVAL;
> +
> +	ret = of_platform_populate(node, NULL, NULL, dev);
> +	if (ret) {
> +		dev_err(dev, "failed to add dwc3 core\n");
> +		return ret;
> +	}
> +
> +	dwc3_node = of_get_compatible_child(node, "snps,dwc3");
> +	if (!dwc3_node) {
> +		dev_err(dev, "failed to find dwc3 core node\n");
> +		return -ENODEV;
> +	}
> +
> +	dwc3_pdev = of_find_device_by_node(dwc3_node);
> +	if (!dwc3_pdev) {
> +		dev_err(dev, "failed to find dwc3 core platform_device\n");
> +		of_node_put(dwc3_node);
> +		return -ENODEV;
> +	}
> +
> +	dwc3_dev = &dwc3_pdev->dev;
> +	rtk->dwc = platform_get_drvdata(dwc3_pdev);
> +	if (!rtk->dwc) {
> +		dev_err(dev, "failed to find dwc3 core\n");
> +		of_node_put(dwc3_node);
> +		return -ENODEV;
> +	}
> +
> +	dr_mode = usb_get_dr_mode(dwc3_dev);
> +	if (dr_mode != rtk->dwc->dr_mode) {
> +		dev_info(dev, "dts set dr_mode=%d, but dwc3 set dr_mode=%d\n",
> +			 dr_mode, rtk->dwc->dr_mode);
> +		dr_mode = rtk->dwc->dr_mode;
> +	}
> +
> +	rtk->cur_dr_mode = dr_mode;
> +
> +	if (device_property_read_bool(dwc3_dev, "usb-role-switch"))
> +		rtk->support_drd_mode = true;
> +	else
> +		rtk->support_drd_mode = false;
> +
> +	if (rtk->support_drd_mode) {
> +		dwc3_rtk_setup_role_switch(rtk);
> +		rtk->cur_dr_mode = dwc3_rtk_get_dr_mode(rtk);
> +	}
> +
> +	switch_usb2_dr_mode(rtk, rtk->cur_dr_mode);
> +
> +	of_node_put(dwc3_node);
> +	platform_device_put(dwc3_pdev);
> +
> +	return ret;
> +}
> +
> +static int dwc3_rtk_probe(struct platform_device *pdev)
> +{
> +	struct dwc3_rtk *rtk;
> +	struct device *dev = &pdev->dev;
> +	struct device_node *node = dev->of_node;
> +	struct resource *res;
> +	void __iomem *regs;
> +	int ret = 0;
> +	unsigned long probe_time = jiffies;
> +
> +	rtk = devm_kzalloc(dev, sizeof(*rtk), GFP_KERNEL);
> +	if (!rtk) {
> +		ret = -ENOMEM;
> +		goto err1;
> +	}
> +
> +	platform_set_drvdata(pdev, rtk);
> +
> +	rtk->dev = dev;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(dev, "missing memory resource\n");
> +		ret = -ENODEV;
> +		goto err1;
> +	}
> +
> +	regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(regs)) {
> +		ret = PTR_ERR(regs);
> +		goto err1;
> +	}
> +
> +	rtk->regs = regs;
> +	rtk->regs_size = resource_size(res);
> +
> +	rtk->unlink_usb3_port = false;
> +	if (of_property_read_bool(node, "realtek,unlink-usb3-port"))
> +		rtk->unlink_usb3_port = true;
> +
> +	rtk->disable_usb3_phy = false;
> +	if (of_property_read_bool(node, "realtek,disable-usb3-phy"))
> +		rtk->disable_usb3_phy = true;
> +
> +	ret = dwc3_rtk_probe_dwc3_core(rtk);
> +	if (ret) {
> +		dev_err(dev, "%s failed to add dwc3 core\n", __func__);
> +		goto err1;
> +	}
> +
> +	dev_dbg(dev, "%s ok! (take %d ms)\n", __func__,
> +		jiffies_to_msecs(jiffies - probe_time));
> +
> +	return 0;
> +
> +err1:
> +	return ret;
> +}
> +
> +static void dwc3_rtk_remove(struct platform_device *pdev)
> +{
> +	struct dwc3_rtk *rtk = platform_get_drvdata(pdev);
> +
> +	rtk->dwc = NULL;
> +
> +	if (rtk->support_drd_mode)
> +		dwc3_rtk_remove_role_switch(rtk);
> +
> +	of_platform_depopulate(rtk->dev);
> +}
> +
> +static void dwc3_rtk_shutdown(struct platform_device *pdev)
> +{
> +	struct dwc3_rtk *rtk = platform_get_drvdata(pdev);
> +
> +	of_platform_depopulate(rtk->dev);
> +}
> +
> +static const struct of_device_id rtk_dwc3_match[] = {
> +	{ .compatible = "realtek,rtd-dwc3" },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, rtk_dwc3_match);
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int dwc3_rtk_suspend(struct device *dev)
> +{
> +	return 0;
> +}
> +
> +static int dwc3_rtk_resume(struct device *dev)
> +{
> +	struct dwc3_rtk *rtk = dev_get_drvdata(dev);
> +
> +	dwc3_rtk_init(rtk);
> +
> +	switch_usb2_dr_mode(rtk, rtk->cur_dr_mode);
> +
> +	/* runtime set active to reflect active state. */
> +	pm_runtime_disable(dev);
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +
> +	return 0;
> +}
> +
> +static const struct dev_pm_ops dwc3_rtk_dev_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(dwc3_rtk_suspend, dwc3_rtk_resume)
> +};
> +
> +#define DEV_PM_OPS	(&dwc3_rtk_dev_pm_ops)
> +#else
> +#define DEV_PM_OPS	NULL
> +#endif /* CONFIG_PM_SLEEP */
> +
> +static struct platform_driver dwc3_rtk_driver = {
> +	.probe		= dwc3_rtk_probe,
> +	.remove_new	= dwc3_rtk_remove,
> +	.driver		= {
> +		.name	= "rtk-dwc3",
> +		.of_match_table = rtk_dwc3_match,
> +		.pm	= DEV_PM_OPS,
> +	},
> +	.shutdown	= dwc3_rtk_shutdown,
> +};
> +
> +module_platform_driver(dwc3_rtk_driver);
> +
> +MODULE_AUTHOR("Stanley Chang <stanley_chang@...ltek.com>");
> +MODULE_DESCRIPTION("DesignWare USB3 Realtek Glue Layer");
> +MODULE_ALIAS("platform:rtk-dwc3");
> +MODULE_LICENSE("GPL");

I'm not familiar with licensing much, but can the SPDX header indicates
different version than the module license?

> +MODULE_SOFTDEP("pre: phy_rtk_usb2 phy_rtk_usb3");
> -- 
> 2.34.1
> 

BR,
Thinh

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