drivers/usb/musb/mediatek.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2019 MediaTek Inc.
  *
  * Author:
  *  Min Guo <min.guo@mediatek.com>
  *  Yonglong Wu <yonglong.wu@mediatek.com>
  */

 #include <linux/clk.h>
 #include <linux/dma-mapping.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/usb/role.h>
 #include <linux/usb/usb_phy_generic.h>
 #include "musb_core.h"
 #include "musb_dma.h"

 #define USB_L1INTS		0x00a0
 #define USB_L1INTM		0x00a4
 #define MTK_MUSB_TXFUNCADDR	0x0480

 /* MediaTek controller toggle enable and status reg */
 #define MUSB_RXTOG		0x80
 #define MUSB_RXTOGEN		0x82
 #define MUSB_TXTOG		0x84
 #define MUSB_TXTOGEN		0x86
 #define MTK_TOGGLE_EN		GENMASK(15, 0)

 #define TX_INT_STATUS		BIT(0)
 #define RX_INT_STATUS		BIT(1)
 #define USBCOM_INT_STATUS	BIT(2)
 #define DMA_INT_STATUS		BIT(3)

 #define DMA_INTR_STATUS_MSK	GENMASK(7, 0)
 #define DMA_INTR_UNMASK_SET_MSK	GENMASK(31, 24)

 struct mtk_glue {
 	struct device *dev;
 	struct musb *musb;
 	struct platform_device *musb_pdev;
 	struct platform_device *usb_phy;
 	struct phy *phy;
 	struct usb_phy *xceiv;
 	enum phy_mode phy_mode;
 	struct clk *main;
 	struct clk *mcu;
 	struct clk *univpll;
 	enum usb_role role;
 	struct usb_role_switch *role_sw;
 };

 static int mtk_musb_clks_get(struct mtk_glue *glue)
 {
 	struct device *dev = glue->dev;

 	glue->main = devm_clk_get(dev, "main");
 	if (IS_ERR(glue->main)) {
 		dev_err(dev, "fail to get main clock\n");
 		return PTR_ERR(glue->main);
 	}

 	glue->mcu = devm_clk_get(dev, "mcu");
 	if (IS_ERR(glue->mcu)) {
 		dev_err(dev, "fail to get mcu clock\n");
 		return PTR_ERR(glue->mcu);
 	}

 	glue->univpll = devm_clk_get(dev, "univpll");
 	if (IS_ERR(glue->univpll)) {
 		dev_err(dev, "fail to get univpll clock\n");
 		return PTR_ERR(glue->univpll);
 	}

 	return 0;
 }

 static int mtk_musb_clks_enable(struct mtk_glue *glue)
 {
 	int ret;

 	ret = clk_prepare_enable(glue->main);
 	if (ret) {
 		dev_err(glue->dev, "failed to enable main clock\n");
 		goto err_main_clk;
 	}

 	ret = clk_prepare_enable(glue->mcu);
 	if (ret) {
 		dev_err(glue->dev, "failed to enable mcu clock\n");
 		goto err_mcu_clk;
 	}

 	ret = clk_prepare_enable(glue->univpll);
 	if (ret) {
 		dev_err(glue->dev, "failed to enable univpll clock\n");
 		goto err_univpll_clk;
 	}

 	return 0;

 err_univpll_clk:
 	clk_disable_unprepare(glue->mcu);
 err_mcu_clk:
 	clk_disable_unprepare(glue->main);
 err_main_clk:
 	return ret;
 }

 static void mtk_musb_clks_disable(struct mtk_glue *glue)
 {
 	clk_disable_unprepare(glue->univpll);
 	clk_disable_unprepare(glue->mcu);
 	clk_disable_unprepare(glue->main);
 }

 static int mtk_otg_switch_set(struct mtk_glue *glue, enum usb_role role)
 {
 	struct musb *musb = glue->musb;
 	u8 devctl = readb(musb->mregs + MUSB_DEVCTL);
 	enum usb_role new_role;

 	if (role == glue->role)
 		return 0;

 	switch (role) {
 	case USB_ROLE_HOST:
 		musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
 		glue->phy_mode = PHY_MODE_USB_HOST;
 		new_role = USB_ROLE_HOST;
 		if (glue->role == USB_ROLE_NONE)
 			phy_power_on(glue->phy);

 		devctl |= MUSB_DEVCTL_SESSION;
 		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 		MUSB_HST_MODE(musb);
 		break;
 	case USB_ROLE_DEVICE:
 		musb->xceiv->otg->state = OTG_STATE_B_IDLE;
 		glue->phy_mode = PHY_MODE_USB_DEVICE;
 		new_role = USB_ROLE_DEVICE;
 		devctl &= ~MUSB_DEVCTL_SESSION;
 		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 		if (glue->role == USB_ROLE_NONE)
 			phy_power_on(glue->phy);

 		MUSB_DEV_MODE(musb);
 		break;
 	case USB_ROLE_NONE:
 		glue->phy_mode = PHY_MODE_USB_OTG;
 		new_role = USB_ROLE_NONE;
 		devctl &= ~MUSB_DEVCTL_SESSION;
 		musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
 		if (glue->role != USB_ROLE_NONE)
 			phy_power_off(glue->phy);

 		break;
 	default:
 		dev_err(glue->dev, "Invalid State\n");
 		return -EINVAL;
 	}

 	glue->role = new_role;
 	phy_set_mode(glue->phy, glue->phy_mode);

 	return 0;
 }

 static int musb_usb_role_sx_set(struct usb_role_switch *sw, enum usb_role role)
 {
 	return mtk_otg_switch_set(usb_role_switch_get_drvdata(sw), role);
 }

 static enum usb_role musb_usb_role_sx_get(struct usb_role_switch *sw)
 {
 	struct mtk_glue *glue = usb_role_switch_get_drvdata(sw);

 	return glue->role;
 }

 static int mtk_otg_switch_init(struct mtk_glue *glue)
 {
 	struct usb_role_switch_desc role_sx_desc = { 0 };

 	role_sx_desc.set = musb_usb_role_sx_set;
 	role_sx_desc.get = musb_usb_role_sx_get;
 	role_sx_desc.allow_userspace_control = true;
 	role_sx_desc.fwnode = dev_fwnode(glue->dev);
 	role_sx_desc.driver_data = glue;
 	glue->role_sw = usb_role_switch_register(glue->dev, &role_sx_desc);

 	return PTR_ERR_OR_ZERO(glue->role_sw);
 }

 static void mtk_otg_switch_exit(struct mtk_glue *glue)
 {
 	return usb_role_switch_unregister(glue->role_sw);
 }

 static irqreturn_t generic_interrupt(int irq, void *__hci)
 {
 	unsigned long flags;
 	irqreturn_t retval = IRQ_NONE;
 	struct musb *musb = __hci;

 	spin_lock_irqsave(&musb->lock, flags);
 	musb->int_usb = musb_clearb(musb->mregs, MUSB_INTRUSB);
 	musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
 	musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);

 	if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
 		/* ep0 FADDR must be 0 when (re)entering peripheral mode */
 		musb_ep_select(musb->mregs, 0);
 		musb_writeb(musb->mregs, MUSB_FADDR, 0);
 	}

 	if (musb->int_usb || musb->int_tx || musb->int_rx)
 		retval = musb_interrupt(musb);

 	spin_unlock_irqrestore(&musb->lock, flags);

 	return retval;
 }

 static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
 {
 	irqreturn_t retval = IRQ_NONE;
 	struct musb *musb = (struct musb *)dev_id;
 	u32 l1_ints;

 	l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
 			musb_readl(musb->mregs, USB_L1INTM);

 	if (l1_ints & (TX_INT_STATUS | RX_INT_STATUS | USBCOM_INT_STATUS))
 		retval = generic_interrupt(irq, musb);

 #if defined(CONFIG_USB_INVENTRA_DMA)
 	if (l1_ints & DMA_INT_STATUS)
 		retval = dma_controller_irq(irq, musb->dma_controller);
 #endif
 	return retval;
 }

 static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
 {
 	return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
 }

 static u8 mtk_musb_clearb(void __iomem *addr, unsigned int offset)
 {
 	u8 data;

 	/* W1C */
 	data = musb_readb(addr, offset);
 	musb_writeb(addr, offset, data);
 	return data;
 }

 static u16 mtk_musb_clearw(void __iomem *addr, unsigned int offset)
 {
 	u16 data;

 	/* W1C */
 	data = musb_readw(addr, offset);
 	musb_writew(addr, offset, data);
 	return data;
 }

 static int mtk_musb_set_mode(struct musb *musb, u8 mode)
 {
 	struct device *dev = musb->controller;
 	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
 	enum phy_mode new_mode;
 	enum usb_role new_role;

 	switch (mode) {
 	case MUSB_HOST:
 		new_mode = PHY_MODE_USB_HOST;
 		new_role = USB_ROLE_HOST;
 		break;
 	case MUSB_PERIPHERAL:
 		new_mode = PHY_MODE_USB_DEVICE;
 		new_role = USB_ROLE_DEVICE;
 		break;
 	case MUSB_OTG:
 		new_mode = PHY_MODE_USB_OTG;
 		new_role = USB_ROLE_NONE;
 		break;
 	default:
 		dev_err(glue->dev, "Invalid mode request\n");
 		return -EINVAL;
 	}

 	if (glue->phy_mode == new_mode)
 		return 0;

 	if (musb->port_mode != MUSB_OTG) {
 		dev_err(glue->dev, "Does not support changing modes\n");
 		return -EINVAL;
 	}

 	mtk_otg_switch_set(glue, new_role);
 	return 0;
 }

 static int mtk_musb_init(struct musb *musb)
 {
 	struct device *dev = musb->controller;
 	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
 	int ret;

 	glue->musb = musb;
 	musb->phy = glue->phy;
 	musb->xceiv = glue->xceiv;
 	musb->is_host = false;
 	musb->isr = mtk_musb_interrupt;

 	/* Set TX/RX toggle enable */
 	musb_writew(musb->mregs, MUSB_TXTOGEN, MTK_TOGGLE_EN);
 	musb_writew(musb->mregs, MUSB_RXTOGEN, MTK_TOGGLE_EN);

 	if (musb->port_mode == MUSB_OTG) {
 		ret = mtk_otg_switch_init(glue);
 		if (ret)
 			return ret;
 	}

 	ret = phy_init(glue->phy);
 	if (ret)
 		goto err_phy_init;

 	ret = phy_power_on(glue->phy);
 	if (ret)
 		goto err_phy_power_on;

 	phy_set_mode(glue->phy, glue->phy_mode);

 #if defined(CONFIG_USB_INVENTRA_DMA)
 	musb_writel(musb->mregs, MUSB_HSDMA_INTR,
 		    DMA_INTR_STATUS_MSK | DMA_INTR_UNMASK_SET_MSK);
 #endif
 	musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS | RX_INT_STATUS |
 		    USBCOM_INT_STATUS | DMA_INT_STATUS);
 	return 0;

 err_phy_power_on:
 	phy_exit(glue->phy);
 err_phy_init:
 	mtk_otg_switch_exit(glue);
 	return ret;
 }

 static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_out)
 {
 	struct musb *musb = qh->hw_ep->musb;
 	u8 epnum = qh->hw_ep->epnum;
 	u16 toggle;

 	toggle = musb_readw(musb->mregs, is_out ? MUSB_TXTOG : MUSB_RXTOG);
 	return toggle & (1 << epnum);
 }

 static u16 mtk_musb_set_toggle(struct musb_qh *qh, int is_out, struct urb *urb)
 {
 	struct musb *musb = qh->hw_ep->musb;
 	u8 epnum = qh->hw_ep->epnum;
 	u16 value, toggle;

 	toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);

 	if (is_out) {
 		value = musb_readw(musb->mregs, MUSB_TXTOG);
 		value |= toggle << epnum;
 		musb_writew(musb->mregs, MUSB_TXTOG, value);
 	} else {
 		value = musb_readw(musb->mregs, MUSB_RXTOG);
 		value |= toggle << epnum;
 		musb_writew(musb->mregs, MUSB_RXTOG, value);
 	}

 	return 0;
 }

 static int mtk_musb_exit(struct musb *musb)
 {
 	struct device *dev = musb->controller;
 	struct mtk_glue *glue = dev_get_drvdata(dev->parent);

 	mtk_otg_switch_exit(glue);
 	phy_power_off(glue->phy);
 	phy_exit(glue->phy);
 	mtk_musb_clks_disable(glue);

 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
 	return 0;
 }

 static const struct musb_platform_ops mtk_musb_ops = {
 	.quirks = MUSB_DMA_INVENTRA,
 	.init = mtk_musb_init,
 	.get_toggle = mtk_musb_get_toggle,
 	.set_toggle = mtk_musb_set_toggle,
 	.exit = mtk_musb_exit,
 #ifdef CONFIG_USB_INVENTRA_DMA
 	.dma_init = musbhs_dma_controller_create_noirq,
 	.dma_exit = musbhs_dma_controller_destroy,
 #endif
 	.clearb = mtk_musb_clearb,
 	.clearw = mtk_musb_clearw,
 	.busctl_offset = mtk_musb_busctl_offset,
 	.set_mode = mtk_musb_set_mode,
 };

 #define MTK_MUSB_MAX_EP_NUM	8
 #define MTK_MUSB_RAM_BITS	11

 static struct musb_fifo_cfg mtk_musb_mode_cfg[] = {
 	{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
 	{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
 	{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
 	{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
 	{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
 	{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
 	{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
 	{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
 	{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
 	{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
 	{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 1024, },
 	{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 1024, },
 	{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
 	{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 64, },
 };

 static const struct musb_hdrc_config mtk_musb_hdrc_config = {
 	.fifo_cfg = mtk_musb_mode_cfg,
 	.fifo_cfg_size = ARRAY_SIZE(mtk_musb_mode_cfg),
 	.multipoint = true,
 	.dyn_fifo = true,
 	.num_eps = MTK_MUSB_MAX_EP_NUM,
 	.ram_bits = MTK_MUSB_RAM_BITS,
 };

 static const struct platform_device_info mtk_dev_info = {
 	.name = "musb-hdrc",
 	.id = PLATFORM_DEVID_AUTO,
 	.dma_mask = DMA_BIT_MASK(32),
 };

 static int mtk_musb_probe(struct platform_device *pdev)
 {
 	struct musb_hdrc_platform_data *pdata;
 	struct mtk_glue *glue;
 	struct platform_device_info pinfo;
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	int ret;

 	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
 	if (!glue)
 		return -ENOMEM;

 	glue->dev = dev;
 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;

 	ret = of_platform_populate(np, NULL, NULL, dev);
 	if (ret) {
 		dev_err(dev, "failed to create child devices at %p\n", np);
 		return ret;
 	}

 	ret = mtk_musb_clks_get(glue);
 	if (ret)
 		return ret;

 	pdata->config = &mtk_musb_hdrc_config;
 	pdata->platform_ops = &mtk_musb_ops;
 	pdata->mode = usb_get_dr_mode(dev);

 	if (IS_ENABLED(CONFIG_USB_MUSB_HOST))
 		pdata->mode = USB_DR_MODE_HOST;
 	else if (IS_ENABLED(CONFIG_USB_MUSB_GADGET))
 		pdata->mode = USB_DR_MODE_PERIPHERAL;

 	switch (pdata->mode) {
 	case USB_DR_MODE_HOST:
 		glue->phy_mode = PHY_MODE_USB_HOST;
 		glue->role = USB_ROLE_HOST;
 		break;
 	case USB_DR_MODE_PERIPHERAL:
 		glue->phy_mode = PHY_MODE_USB_DEVICE;
 		glue->role = USB_ROLE_DEVICE;
 		break;
 	case USB_DR_MODE_OTG:
 		glue->phy_mode = PHY_MODE_USB_OTG;
 		glue->role = USB_ROLE_NONE;
 		break;
 	default:
 		dev_err(&pdev->dev, "Error 'dr_mode' property\n");
 		return -EINVAL;
 	}

 	glue->phy = devm_of_phy_get_by_index(dev, np, 0);
 	if (IS_ERR(glue->phy)) {
 		dev_err(dev, "fail to getting phy %ld\n",
 			PTR_ERR(glue->phy));
 		return PTR_ERR(glue->phy);
 	}

 	glue->usb_phy = usb_phy_generic_register();
 	if (IS_ERR(glue->usb_phy)) {
 		dev_err(dev, "fail to registering usb-phy %ld\n",
 			PTR_ERR(glue->usb_phy));
 		return PTR_ERR(glue->usb_phy);
 	}

 	glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
 	if (IS_ERR(glue->xceiv)) {
 		ret = PTR_ERR(glue->xceiv);
 		dev_err(dev, "fail to getting usb-phy %d\n", ret);
 		goto err_unregister_usb_phy;
 	}

 	platform_set_drvdata(pdev, glue);
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);

 	ret = mtk_musb_clks_enable(glue);
 	if (ret)
 		goto err_enable_clk;

 	pinfo = mtk_dev_info;
 	pinfo.parent = dev;
 	pinfo.res = pdev->resource;
 	pinfo.num_res = pdev->num_resources;
 	pinfo.data = pdata;
 	pinfo.size_data = sizeof(*pdata);
 	pinfo.fwnode = of_fwnode_handle(np);
 	pinfo.of_node_reused = true;

 	glue->musb_pdev = platform_device_register_full(&pinfo);
 	if (IS_ERR(glue->musb_pdev)) {
 		ret = PTR_ERR(glue->musb_pdev);
 		dev_err(dev, "failed to register musb device: %d\n", ret);
 		goto err_device_register;
 	}

 	return 0;

 err_device_register:
 	mtk_musb_clks_disable(glue);
 err_enable_clk:
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
 err_unregister_usb_phy:
 	usb_phy_generic_unregister(glue->usb_phy);
 	return ret;
 }

 static int mtk_musb_remove(struct platform_device *pdev)
 {
 	struct mtk_glue *glue = platform_get_drvdata(pdev);
 	struct platform_device *usb_phy = glue->usb_phy;

 	platform_device_unregister(glue->musb_pdev);
 	usb_phy_generic_unregister(usb_phy);

 	return 0;
 }

 #ifdef CONFIG_OF
 static const struct of_device_id mtk_musb_match[] = {
 	{.compatible = "mediatek,mtk-musb",},
 	{},
 };
 MODULE_DEVICE_TABLE(of, mtk_musb_match);
 #endif

 static struct platform_driver mtk_musb_driver = {
 	.probe = mtk_musb_probe,
 	.remove = mtk_musb_remove,
 	.driver = {
 		   .name = "musb-mtk",
 		   .of_match_table = of_match_ptr(mtk_musb_match),
 	},
 };

 module_platform_driver(mtk_musb_driver);

 MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
 MODULE_AUTHOR("Min Guo <min.guo@mediatek.com>");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2019 MediaTek Inc.
	*
	* Author:
	* Min Guo <min.guo@mediatek.com>
	* Yonglong Wu <yonglong.wu@mediatek.com>
	*/

	#include <linux/clk.h>
	#include <linux/dma-mapping.h>
	#include <linux/module.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/usb/role.h>
	#include <linux/usb/usb_phy_generic.h>
	#include "musb_core.h"
	#include "musb_dma.h"

	#define USB_L1INTS 0x00a0
	#define USB_L1INTM 0x00a4
	#define MTK_MUSB_TXFUNCADDR 0x0480

	/* MediaTek controller toggle enable and status reg */
	#define MUSB_RXTOG 0x80
	#define MUSB_RXTOGEN 0x82
	#define MUSB_TXTOG 0x84
	#define MUSB_TXTOGEN 0x86
	#define MTK_TOGGLE_EN GENMASK(15, 0)

	#define TX_INT_STATUS BIT(0)
	#define RX_INT_STATUS BIT(1)
	#define USBCOM_INT_STATUS BIT(2)
	#define DMA_INT_STATUS BIT(3)

	#define DMA_INTR_STATUS_MSK GENMASK(7, 0)
	#define DMA_INTR_UNMASK_SET_MSK GENMASK(31, 24)

	struct mtk_glue {
	struct device *dev;
	struct musb *musb;
	struct platform_device *musb_pdev;
	struct platform_device *usb_phy;
	struct phy *phy;
	struct usb_phy *xceiv;
	enum phy_mode phy_mode;
	struct clk *main;
	struct clk *mcu;
	struct clk *univpll;
	enum usb_role role;
	struct usb_role_switch *role_sw;
	};

	static int mtk_musb_clks_get(struct mtk_glue *glue)
	{
	struct device *dev = glue->dev;

	glue->main = devm_clk_get(dev, "main");
	if (IS_ERR(glue->main)) {
	dev_err(dev, "fail to get main clock\n");
	return PTR_ERR(glue->main);
	}

	glue->mcu = devm_clk_get(dev, "mcu");
	if (IS_ERR(glue->mcu)) {
	dev_err(dev, "fail to get mcu clock\n");
	return PTR_ERR(glue->mcu);
	}

	glue->univpll = devm_clk_get(dev, "univpll");
	if (IS_ERR(glue->univpll)) {
	dev_err(dev, "fail to get univpll clock\n");
	return PTR_ERR(glue->univpll);
	}

	return 0;
	}

	static int mtk_musb_clks_enable(struct mtk_glue *glue)
	{
	int ret;

	ret = clk_prepare_enable(glue->main);
	if (ret) {
	dev_err(glue->dev, "failed to enable main clock\n");
	goto err_main_clk;
	}

	ret = clk_prepare_enable(glue->mcu);
	if (ret) {
	dev_err(glue->dev, "failed to enable mcu clock\n");
	goto err_mcu_clk;
	}

	ret = clk_prepare_enable(glue->univpll);
	if (ret) {
	dev_err(glue->dev, "failed to enable univpll clock\n");
	goto err_univpll_clk;
	}

	return 0;

	err_univpll_clk:
	clk_disable_unprepare(glue->mcu);
	err_mcu_clk:
	clk_disable_unprepare(glue->main);
	err_main_clk:
	return ret;
	}

	static void mtk_musb_clks_disable(struct mtk_glue *glue)
	{
	clk_disable_unprepare(glue->univpll);
	clk_disable_unprepare(glue->mcu);
	clk_disable_unprepare(glue->main);
	}

	static int mtk_otg_switch_set(struct mtk_glue *glue, enum usb_role role)
	{
	struct musb *musb = glue->musb;
	u8 devctl = readb(musb->mregs + MUSB_DEVCTL);
	enum usb_role new_role;

	if (role == glue->role)
	return 0;

	switch (role) {
	case USB_ROLE_HOST:
	musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
	glue->phy_mode = PHY_MODE_USB_HOST;
	new_role = USB_ROLE_HOST;
	if (glue->role == USB_ROLE_NONE)
	phy_power_on(glue->phy);

	devctl \|= MUSB_DEVCTL_SESSION;
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
	MUSB_HST_MODE(musb);
	break;
	case USB_ROLE_DEVICE:
	musb->xceiv->otg->state = OTG_STATE_B_IDLE;
	glue->phy_mode = PHY_MODE_USB_DEVICE;
	new_role = USB_ROLE_DEVICE;
	devctl &= ~MUSB_DEVCTL_SESSION;
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
	if (glue->role == USB_ROLE_NONE)
	phy_power_on(glue->phy);

	MUSB_DEV_MODE(musb);
	break;
	case USB_ROLE_NONE:
	glue->phy_mode = PHY_MODE_USB_OTG;
	new_role = USB_ROLE_NONE;
	devctl &= ~MUSB_DEVCTL_SESSION;
	musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
	if (glue->role != USB_ROLE_NONE)
	phy_power_off(glue->phy);

	break;
	default:
	dev_err(glue->dev, "Invalid State\n");
	return -EINVAL;
	}

	glue->role = new_role;
	phy_set_mode(glue->phy, glue->phy_mode);

	return 0;
	}

	static int musb_usb_role_sx_set(struct usb_role_switch *sw, enum usb_role role)
	{
	return mtk_otg_switch_set(usb_role_switch_get_drvdata(sw), role);
	}

	static enum usb_role musb_usb_role_sx_get(struct usb_role_switch *sw)
	{
	struct mtk_glue *glue = usb_role_switch_get_drvdata(sw);

	return glue->role;
	}

	static int mtk_otg_switch_init(struct mtk_glue *glue)
	{
	struct usb_role_switch_desc role_sx_desc = { 0 };

	role_sx_desc.set = musb_usb_role_sx_set;
	role_sx_desc.get = musb_usb_role_sx_get;
	role_sx_desc.allow_userspace_control = true;
	role_sx_desc.fwnode = dev_fwnode(glue->dev);
	role_sx_desc.driver_data = glue;
	glue->role_sw = usb_role_switch_register(glue->dev, &role_sx_desc);

	return PTR_ERR_OR_ZERO(glue->role_sw);
	}

	static void mtk_otg_switch_exit(struct mtk_glue *glue)
	{
	return usb_role_switch_unregister(glue->role_sw);
	}

	static irqreturn_t generic_interrupt(int irq, void *__hci)
	{
	unsigned long flags;
	irqreturn_t retval = IRQ_NONE;
	struct musb *musb = __hci;

	spin_lock_irqsave(&musb->lock, flags);
	musb->int_usb = musb_clearb(musb->mregs, MUSB_INTRUSB);
	musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
	musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);

	if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
	/* ep0 FADDR must be 0 when (re)entering peripheral mode */
	musb_ep_select(musb->mregs, 0);
	musb_writeb(musb->mregs, MUSB_FADDR, 0);
	}

	if (musb->int_usb \|\| musb->int_tx \|\| musb->int_rx)
	retval = musb_interrupt(musb);

	spin_unlock_irqrestore(&musb->lock, flags);

	return retval;
	}

	static irqreturn_t mtk_musb_interrupt(int irq, void *dev_id)
	{
	irqreturn_t retval = IRQ_NONE;
	struct musb musb = (struct musb )dev_id;
	u32 l1_ints;

	l1_ints = musb_readl(musb->mregs, USB_L1INTS) &
	musb_readl(musb->mregs, USB_L1INTM);

	if (l1_ints & (TX_INT_STATUS \| RX_INT_STATUS \| USBCOM_INT_STATUS))
	retval = generic_interrupt(irq, musb);

	#if defined(CONFIG_USB_INVENTRA_DMA)
	if (l1_ints & DMA_INT_STATUS)
	retval = dma_controller_irq(irq, musb->dma_controller);
	#endif
	return retval;
	}

	static u32 mtk_musb_busctl_offset(u8 epnum, u16 offset)
	{
	return MTK_MUSB_TXFUNCADDR + offset + 8 * epnum;
	}

	static u8 mtk_musb_clearb(void __iomem *addr, unsigned int offset)
	{
	u8 data;

	/* W1C */
	data = musb_readb(addr, offset);
	musb_writeb(addr, offset, data);
	return data;
	}

	static u16 mtk_musb_clearw(void __iomem *addr, unsigned int offset)
	{
	u16 data;

	/* W1C */
	data = musb_readw(addr, offset);
	musb_writew(addr, offset, data);
	return data;
	}

	static int mtk_musb_set_mode(struct musb *musb, u8 mode)
	{
	struct device *dev = musb->controller;
	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
	enum phy_mode new_mode;
	enum usb_role new_role;

	switch (mode) {
	case MUSB_HOST:
	new_mode = PHY_MODE_USB_HOST;
	new_role = USB_ROLE_HOST;
	break;
	case MUSB_PERIPHERAL:
	new_mode = PHY_MODE_USB_DEVICE;
	new_role = USB_ROLE_DEVICE;
	break;
	case MUSB_OTG:
	new_mode = PHY_MODE_USB_OTG;
	new_role = USB_ROLE_NONE;
	break;
	default:
	dev_err(glue->dev, "Invalid mode request\n");
	return -EINVAL;
	}

	if (glue->phy_mode == new_mode)
	return 0;

	if (musb->port_mode != MUSB_OTG) {
	dev_err(glue->dev, "Does not support changing modes\n");
	return -EINVAL;
	}

	mtk_otg_switch_set(glue, new_role);
	return 0;
	}

	static int mtk_musb_init(struct musb *musb)
	{
	struct device *dev = musb->controller;
	struct mtk_glue *glue = dev_get_drvdata(dev->parent);
	int ret;

	glue->musb = musb;
	musb->phy = glue->phy;
	musb->xceiv = glue->xceiv;
	musb->is_host = false;
	musb->isr = mtk_musb_interrupt;

	/* Set TX/RX toggle enable */
	musb_writew(musb->mregs, MUSB_TXTOGEN, MTK_TOGGLE_EN);
	musb_writew(musb->mregs, MUSB_RXTOGEN, MTK_TOGGLE_EN);

	if (musb->port_mode == MUSB_OTG) {
	ret = mtk_otg_switch_init(glue);
	if (ret)
	return ret;
	}

	ret = phy_init(glue->phy);
	if (ret)
	goto err_phy_init;

	ret = phy_power_on(glue->phy);
	if (ret)
	goto err_phy_power_on;

	phy_set_mode(glue->phy, glue->phy_mode);

	#if defined(CONFIG_USB_INVENTRA_DMA)
	musb_writel(musb->mregs, MUSB_HSDMA_INTR,
	DMA_INTR_STATUS_MSK \| DMA_INTR_UNMASK_SET_MSK);
	#endif
	musb_writel(musb->mregs, USB_L1INTM, TX_INT_STATUS \| RX_INT_STATUS \|
	USBCOM_INT_STATUS \| DMA_INT_STATUS);
	return 0;

	err_phy_power_on:
	phy_exit(glue->phy);
	err_phy_init:
	mtk_otg_switch_exit(glue);
	return ret;
	}

	static u16 mtk_musb_get_toggle(struct musb_qh *qh, int is_out)
	{
	struct musb *musb = qh->hw_ep->musb;
	u8 epnum = qh->hw_ep->epnum;
	u16 toggle;

	toggle = musb_readw(musb->mregs, is_out ? MUSB_TXTOG : MUSB_RXTOG);
	return toggle & (1 << epnum);
	}

	static u16 mtk_musb_set_toggle(struct musb_qh qh, int is_out, struct urb urb)
	{
	struct musb *musb = qh->hw_ep->musb;
	u8 epnum = qh->hw_ep->epnum;
	u16 value, toggle;

	toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);

	if (is_out) {
	value = musb_readw(musb->mregs, MUSB_TXTOG);
	value \|= toggle << epnum;
	musb_writew(musb->mregs, MUSB_TXTOG, value);
	} else {
	value = musb_readw(musb->mregs, MUSB_RXTOG);
	value \|= toggle << epnum;
	musb_writew(musb->mregs, MUSB_RXTOG, value);
	}

	return 0;
	}

	static int mtk_musb_exit(struct musb *musb)
	{
	struct device *dev = musb->controller;
	struct mtk_glue *glue = dev_get_drvdata(dev->parent);

	mtk_otg_switch_exit(glue);
	phy_power_off(glue->phy);
	phy_exit(glue->phy);
	mtk_musb_clks_disable(glue);

	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);
	return 0;
	}

	static const struct musb_platform_ops mtk_musb_ops = {
	.quirks = MUSB_DMA_INVENTRA,
	.init = mtk_musb_init,
	.get_toggle = mtk_musb_get_toggle,
	.set_toggle = mtk_musb_set_toggle,
	.exit = mtk_musb_exit,
	#ifdef CONFIG_USB_INVENTRA_DMA
	.dma_init = musbhs_dma_controller_create_noirq,
	.dma_exit = musbhs_dma_controller_destroy,
	#endif
	.clearb = mtk_musb_clearb,
	.clearw = mtk_musb_clearw,
	.busctl_offset = mtk_musb_busctl_offset,
	.set_mode = mtk_musb_set_mode,
	};

	#define MTK_MUSB_MAX_EP_NUM 8
	#define MTK_MUSB_RAM_BITS 11

	static struct musb_fifo_cfg mtk_musb_mode_cfg[] = {
	{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, },
	{ .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 1024, },
	{ .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 1024, },
	{ .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, },
	{ .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 64, },
	};

	static const struct musb_hdrc_config mtk_musb_hdrc_config = {
	.fifo_cfg = mtk_musb_mode_cfg,
	.fifo_cfg_size = ARRAY_SIZE(mtk_musb_mode_cfg),
	.multipoint = true,
	.dyn_fifo = true,
	.num_eps = MTK_MUSB_MAX_EP_NUM,
	.ram_bits = MTK_MUSB_RAM_BITS,
	};

	static const struct platform_device_info mtk_dev_info = {
	.name = "musb-hdrc",
	.id = PLATFORM_DEVID_AUTO,
	.dma_mask = DMA_BIT_MASK(32),
	};

	static int mtk_musb_probe(struct platform_device *pdev)
	{
	struct musb_hdrc_platform_data *pdata;
	struct mtk_glue *glue;
	struct platform_device_info pinfo;
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	int ret;

	glue = devm_kzalloc(dev, sizeof(*glue), GFP_KERNEL);
	if (!glue)
	return -ENOMEM;

	glue->dev = dev;
	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
	return -ENOMEM;

	ret = of_platform_populate(np, NULL, NULL, dev);
	if (ret) {
	dev_err(dev, "failed to create child devices at %p\n", np);
	return ret;
	}

	ret = mtk_musb_clks_get(glue);
	if (ret)
	return ret;

	pdata->config = &mtk_musb_hdrc_config;
	pdata->platform_ops = &mtk_musb_ops;
	pdata->mode = usb_get_dr_mode(dev);

	if (IS_ENABLED(CONFIG_USB_MUSB_HOST))
	pdata->mode = USB_DR_MODE_HOST;
	else if (IS_ENABLED(CONFIG_USB_MUSB_GADGET))
	pdata->mode = USB_DR_MODE_PERIPHERAL;

	switch (pdata->mode) {
	case USB_DR_MODE_HOST:
	glue->phy_mode = PHY_MODE_USB_HOST;
	glue->role = USB_ROLE_HOST;
	break;
	case USB_DR_MODE_PERIPHERAL:
	glue->phy_mode = PHY_MODE_USB_DEVICE;
	glue->role = USB_ROLE_DEVICE;
	break;
	case USB_DR_MODE_OTG:
	glue->phy_mode = PHY_MODE_USB_OTG;
	glue->role = USB_ROLE_NONE;
	break;
	default:
	dev_err(&pdev->dev, "Error 'dr_mode' property\n");
	return -EINVAL;
	}

	glue->phy = devm_of_phy_get_by_index(dev, np, 0);
	if (IS_ERR(glue->phy)) {
	dev_err(dev, "fail to getting phy %ld\n",
	PTR_ERR(glue->phy));
	return PTR_ERR(glue->phy);
	}

	glue->usb_phy = usb_phy_generic_register();
	if (IS_ERR(glue->usb_phy)) {
	dev_err(dev, "fail to registering usb-phy %ld\n",
	PTR_ERR(glue->usb_phy));
	return PTR_ERR(glue->usb_phy);
	}

	glue->xceiv = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
	if (IS_ERR(glue->xceiv)) {
	ret = PTR_ERR(glue->xceiv);
	dev_err(dev, "fail to getting usb-phy %d\n", ret);
	goto err_unregister_usb_phy;
	}

	platform_set_drvdata(pdev, glue);
	pm_runtime_enable(dev);
	pm_runtime_get_sync(dev);

	ret = mtk_musb_clks_enable(glue);
	if (ret)
	goto err_enable_clk;

	pinfo = mtk_dev_info;
	pinfo.parent = dev;
	pinfo.res = pdev->resource;
	pinfo.num_res = pdev->num_resources;
	pinfo.data = pdata;
	pinfo.size_data = sizeof(*pdata);
	pinfo.fwnode = of_fwnode_handle(np);
	pinfo.of_node_reused = true;

	glue->musb_pdev = platform_device_register_full(&pinfo);
	if (IS_ERR(glue->musb_pdev)) {
	ret = PTR_ERR(glue->musb_pdev);
	dev_err(dev, "failed to register musb device: %d\n", ret);
	goto err_device_register;
	}

	return 0;

	err_device_register:
	mtk_musb_clks_disable(glue);
	err_enable_clk:
	pm_runtime_put_sync(dev);
	pm_runtime_disable(dev);
	err_unregister_usb_phy:
	usb_phy_generic_unregister(glue->usb_phy);
	return ret;
	}

	static int mtk_musb_remove(struct platform_device *pdev)
	{
	struct mtk_glue *glue = platform_get_drvdata(pdev);
	struct platform_device *usb_phy = glue->usb_phy;

	platform_device_unregister(glue->musb_pdev);
	usb_phy_generic_unregister(usb_phy);

	return 0;
	}

	#ifdef CONFIG_OF
	static const struct of_device_id mtk_musb_match[] = {
	{.compatible = "mediatek,mtk-musb",},
	{},
	};
	MODULE_DEVICE_TABLE(of, mtk_musb_match);
	#endif

	static struct platform_driver mtk_musb_driver = {
	.probe = mtk_musb_probe,
	.remove = mtk_musb_remove,
	.driver = {
	.name = "musb-mtk",
	.of_match_table = of_match_ptr(mtk_musb_match),
	},
	};

	module_platform_driver(mtk_musb_driver);

	MODULE_DESCRIPTION("MediaTek MUSB Glue Layer");
	MODULE_AUTHOR("Min Guo <min.guo@mediatek.com>");
	MODULE_LICENSE("GPL v2");