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    Subject[PATCH v4 6/6] usb: musb: Add support for MediaTek musb controller
    Date
    From: Min Guo <min.guo@mediatek.com>

    This adds support for MediaTek musb controller in
    host, peripheral and otg mode.
    There are some quirk of MediaTek musb controller, such as:
    -W1C interrupt status registers
    -Private data toggle registers
    -No dedicated DMA interrupt line

    Signed-off-by: Min Guo <min.guo@mediatek.com>
    Signed-off-by: Yonglong Wu <yonglong.wu@mediatek.com>
    ---
    changes in v4:
    1. no changes

    changes in v3:
    suggested by Bin:
    1. Remove 'u8/u16 data' parameter in clearb/w() hooks
    2. Replace musb_readb/w() with musb_clearb/w() to clear interrupts status

    changes in v2:
    suggested by Bin:
    1. Add summarize of MediaTek musb controller differences in the commit log
    2. Add "|| COMPILE_TEST" in Kconfig
    3. Move MediaTek's private toggle registers from musb_regs.h to mediatek.c
    4. Replace musb_readl() with musb_readw() to read 16bit toggle register
    ---
    drivers/usb/musb/Kconfig | 8 +-
    drivers/usb/musb/Makefile | 1 +
    drivers/usb/musb/mediatek.c | 624 ++++++++++++++++++++++++++++++++++++++++++++
    3 files changed, 632 insertions(+), 1 deletion(-)
    create mode 100644 drivers/usb/musb/mediatek.c

    diff --git a/drivers/usb/musb/Kconfig b/drivers/usb/musb/Kconfig
    index ad08895..b72b7c1 100644
    --- a/drivers/usb/musb/Kconfig
    +++ b/drivers/usb/musb/Kconfig
    @@ -115,6 +115,12 @@ config USB_MUSB_JZ4740
    depends on USB_MUSB_GADGET
    depends on USB_OTG_BLACKLIST_HUB

    +config USB_MUSB_MEDIATEK
    + tristate "MediaTek platforms"
    + depends on ARCH_MEDIATEK || COMPILE_TEST
    + depends on NOP_USB_XCEIV
    + depends on GENERIC_PHY
    +
    config USB_MUSB_AM335X_CHILD
    tristate

    @@ -141,7 +147,7 @@ config USB_UX500_DMA

    config USB_INVENTRA_DMA
    bool 'Inventra'
    - depends on USB_MUSB_OMAP2PLUS
    + depends on USB_MUSB_OMAP2PLUS || USB_MUSB_MEDIATEK
    help
    Enable DMA transfers using Mentor's engine.

    diff --git a/drivers/usb/musb/Makefile b/drivers/usb/musb/Makefile
    index 3a88c79..63d82d0 100644
    --- a/drivers/usb/musb/Makefile
    +++ b/drivers/usb/musb/Makefile
    @@ -24,6 +24,7 @@ obj-$(CONFIG_USB_MUSB_DA8XX) += da8xx.o
    obj-$(CONFIG_USB_MUSB_UX500) += ux500.o
    obj-$(CONFIG_USB_MUSB_JZ4740) += jz4740.o
    obj-$(CONFIG_USB_MUSB_SUNXI) += sunxi.o
    +obj-$(CONFIG_USB_MUSB_MEDIATEK) += mediatek.o


    obj-$(CONFIG_USB_MUSB_AM335X_CHILD) += musb_am335x.o
    diff --git a/drivers/usb/musb/mediatek.c b/drivers/usb/musb/mediatek.c
    new file mode 100644
    index 0000000..65cafa6
    --- /dev/null
    +++ b/drivers/usb/musb/mediatek.c
    @@ -0,0 +1,624 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/*
    + * Copyright (C) 2018 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/platform_device.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 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)
    +
    +enum mtk_vbus_id_state {
    + MTK_ID_FLOAT = 1,
    + MTK_ID_GROUND,
    + MTK_VBUS_OFF,
    + MTK_VBUS_VALID,
    +};
    +
    +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;
    + struct regulator *vbus;
    + struct extcon_dev *edev;
    + struct notifier_block vbus_nb;
    + struct notifier_block id_nb;
    +};
    +
    +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 void mtk_musb_set_vbus(struct musb *musb, int is_on)
    +{
    + struct device *dev = musb->controller;
    + struct mtk_glue *glue = dev_get_drvdata(dev->parent);
    + int ret;
    +
    + /* vbus is optional */
    + if (!glue->vbus)
    + return;
    +
    + dev_dbg(musb->controller, "%s, is_on=%d\r\n", __func__, is_on);
    + if (is_on) {
    + ret = regulator_enable(glue->vbus);
    + if (ret) {
    + dev_err(glue->dev, "fail to enable vbus regulator\n");
    + return;
    + }
    + } else {
    + regulator_disable(glue->vbus);
    + }
    +}
    +
    +/*
    + * switch to host: -> MTK_VBUS_OFF --> MTK_ID_GROUND
    + * switch to device: -> MTK_ID_FLOAT --> MTK_VBUS_VALID
    + */
    +static void mtk_musb_set_mailbox(struct mtk_glue *glue,
    + enum mtk_vbus_id_state status)
    +{
    + struct musb *musb = glue->musb;
    + u8 devctl = 0;
    +
    + dev_dbg(glue->dev, "mailbox state(%d)\n", status);
    + switch (status) {
    + case MTK_ID_GROUND:
    + phy_power_on(glue->phy);
    + devctl = readb(musb->mregs + MUSB_DEVCTL);
    + musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
    + mtk_musb_set_vbus(musb, 1);
    + glue->phy_mode = PHY_MODE_USB_HOST;
    + phy_set_mode(glue->phy, glue->phy_mode);
    + devctl |= MUSB_DEVCTL_SESSION;
    + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
    + MUSB_HST_MODE(musb);
    + break;
    + /*
    + * MTK_ID_FLOAT process is the same as MTK_VBUS_VALID
    + * except that turn off VBUS
    + */
    + case MTK_ID_FLOAT:
    + mtk_musb_set_vbus(musb, 0);
    + /* fall through */
    + case MTK_VBUS_OFF:
    + musb->xceiv->otg->state = OTG_STATE_B_IDLE;
    + devctl &= ~MUSB_DEVCTL_SESSION;
    + musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
    + phy_power_off(glue->phy);
    + break;
    + case MTK_VBUS_VALID:
    + phy_power_on(glue->phy);
    + glue->phy_mode = PHY_MODE_USB_DEVICE;
    + phy_set_mode(glue->phy, glue->phy_mode);
    + MUSB_DEV_MODE(musb);
    + break;
    + default:
    + dev_err(glue->dev, "invalid state\n");
    + }
    +}
    +
    +static int mtk_musb_id_notifier(struct notifier_block *nb,
    + unsigned long event, void *ptr)
    +{
    + struct mtk_glue *glue = container_of(nb, struct mtk_glue, id_nb);
    +
    + if (event)
    + mtk_musb_set_mailbox(glue, MTK_ID_GROUND);
    + else
    + mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
    +
    + return NOTIFY_DONE;
    +}
    +
    +static int mtk_musb_vbus_notifier(struct notifier_block *nb,
    + unsigned long event, void *ptr)
    +{
    + struct mtk_glue *glue = container_of(nb, struct mtk_glue, vbus_nb);
    +
    + if (event)
    + mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
    + else
    + mtk_musb_set_mailbox(glue, MTK_VBUS_OFF);
    +
    + return NOTIFY_DONE;
    +}
    +
    +static void mtk_otg_switch_init(struct mtk_glue *glue)
    +{
    + int ret;
    +
    + /* extcon is optional */
    + if (!glue->edev)
    + return;
    +
    + glue->vbus_nb.notifier_call = mtk_musb_vbus_notifier;
    + ret = devm_extcon_register_notifier(glue->dev, glue->edev, EXTCON_USB,
    + &glue->vbus_nb);
    + if (ret < 0)
    + dev_err(glue->dev, "failed to register notifier for USB\n");
    +
    + glue->id_nb.notifier_call = mtk_musb_id_notifier;
    + ret = devm_extcon_register_notifier(glue->dev, glue->edev,
    + EXTCON_USB_HOST, &glue->id_nb);
    + if (ret < 0)
    + dev_err(glue->dev, "failed to register notifier for USB-HOST\n");
    +
    + dev_dbg(glue->dev, "EXTCON_USB: %d, EXTCON_USB_HOST: %d\n",
    + extcon_get_state(glue->edev, EXTCON_USB),
    + extcon_get_state(glue->edev, EXTCON_USB_HOST));
    +
    + /* default as host, switch to device mode if needed */
    + if (extcon_get_state(glue->edev, EXTCON_USB_HOST) == false)
    + mtk_musb_set_mailbox(glue, MTK_ID_FLOAT);
    + if (extcon_get_state(glue->edev, EXTCON_USB) == true)
    + mtk_musb_set_mailbox(glue, MTK_VBUS_VALID);
    +}
    +
    +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_readb(musb->mregs, MUSB_INTRUSB) &
    + musb_readb(musb->mregs, MUSB_INTRUSBE);
    + musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX)
    + & musb_readw(musb->mregs, MUSB_INTRTXE);
    + musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX)
    + & musb_readw(musb->mregs, MUSB_INTRRXE);
    + /* MediaTek controller interrupt status is W1C */
    + musb_clearw(musb->mregs, MUSB_INTRRX);
    + musb_clearw(musb->mregs, MUSB_INTRTX);
    + musb_clearb(musb->mregs, MUSB_INTRUSB);
    +
    + 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 musb_readb(addr, offset);
    +}
    +
    +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 musb_readw(addr, offset);
    +}
    +
    +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;
    + ret = phy_init(glue->phy);
    + if (ret)
    + return ret;
    +
    + ret = phy_power_on(glue->phy);
    + if (ret) {
    + phy_exit(glue->phy);
    + return ret;
    + }
    +
    + 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;
    +}
    +
    +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;
    +
    + if (is_out)
    + toggle = musb_readw(musb->mregs, MUSB_TXTOG);
    + else
    + toggle = musb_readw(musb->mregs, 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 toggle;
    +
    + toggle = usb_gettoggle(urb->dev, qh->epnum, is_out);
    +
    + if (is_out) {
    + musb_writew(musb->mregs, MUSB_TXTOGEN, (1 << epnum));
    + musb_writew(musb->mregs, MUSB_TXTOG, (toggle << epnum));
    + } else {
    + musb_writew(musb->mregs, MUSB_RXTOGEN, (1 << epnum));
    + musb_writew(musb->mregs, MUSB_RXTOG, (toggle << epnum));
    + }
    +
    + return 0;
    +}
    +
    +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;
    +
    + switch (mode) {
    + case MUSB_HOST:
    + new_mode = PHY_MODE_USB_HOST;
    + mtk_musb_set_vbus(musb, 1);
    + break;
    + case MUSB_PERIPHERAL:
    + new_mode = PHY_MODE_USB_DEVICE;
    + break;
    + case MUSB_OTG:
    + new_mode = PHY_MODE_USB_HOST;
    + break;
    + default:
    + dev_err(musb->controller->parent,
    + "Error requested mode not supported by this kernel\n");
    + return -EINVAL;
    + }
    + if (glue->phy_mode == new_mode)
    + return 0;
    +
    + mtk_musb_set_mailbox(glue, MTK_ID_GROUND);
    + return 0;
    +}
    +
    +static int mtk_musb_exit(struct musb *musb)
    +{
    + struct device *dev = musb->controller;
    + struct mtk_glue *glue = dev_get_drvdata(dev->parent);
    +
    + 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,
    + .set_vbus = mtk_musb_set_vbus,
    +};
    +
    +#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 = -ENOMEM;
    +
    + 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 = mtk_musb_clks_get(glue);
    + if (ret)
    + return ret;
    +
    + glue->vbus = devm_regulator_get(dev, "vbus");
    + if (IS_ERR(glue->vbus)) {
    + dev_err(dev, "fail to get vbus\n");
    + return PTR_ERR(glue->vbus);
    + }
    +
    + pdata->config = &mtk_musb_hdrc_config;
    + pdata->platform_ops = &mtk_musb_ops;
    + if (of_property_read_bool(np, "extcon")) {
    + glue->edev = extcon_get_edev_by_phandle(dev, 0);
    + if (IS_ERR(glue->edev)) {
    + dev_err(dev, "fail to get extcon\n");
    + return PTR_ERR(glue->edev);
    + }
    + }
    +
    + pdata->mode = usb_get_dr_mode(dev);
    + switch (pdata->mode) {
    + case USB_DR_MODE_HOST:
    + glue->phy_mode = PHY_MODE_USB_HOST;
    + break;
    + case USB_DR_MODE_PERIPHERAL:
    + glue->phy_mode = PHY_MODE_USB_DEVICE;
    + break;
    + default:
    + pdata->mode = USB_DR_MODE_OTG;
    + /* FALL THROUGH */
    + case USB_DR_MODE_OTG:
    + glue->phy_mode = PHY_MODE_USB_OTG;
    + break;
    + }
    +
    + 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)) {
    + dev_err(dev, "fail to getting usb-phy %d\n", ret);
    + ret = PTR_ERR(glue->xceiv);
    + 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);
    +
    + 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;
    + }
    +
    + if (pdata->mode == USB_DR_MODE_OTG)
    + mtk_otg_switch_init(glue);
    +
    + 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");
    --
    1.9.1
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      Last update: 2019-01-21 13:24    [W:3.639 / U:0.024 seconds]
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