/*
   * Copyright 2005-2009 MontaVista Software, Inc.
   * Copyright 2008,2012      Freescale Semiconductor, Inc.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the
   * Free Software Foundation; either version 2 of the License, or (at your
   * option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   *
   * Ported to 834x by Randy Vinson <rvinson@mvista.com> using code provided
   * by Hunter Wu.
   * Power Management support by Dave Liu <daveliu@freescale.com>,
   * Jerry Huang <Chang-Ming.Huang@freescale.com> and
   * Anton Vorontsov <avorontsov@ru.mvista.com>.
   */
  
  #include <linux/kernel.h>
  #include <linux/types.h>
  #include <linux/delay.h>
  #include <linux/pm.h>
  #include <linux/err.h>
  #include <linux/platform_device.h>
  #include <linux/fsl_devices.h>
  
  #include "ehci-fsl.h"
  
  /* configure so an HC device and id are always provided */
  /* always called with process context; sleeping is OK */
  
  /**
   * usb_hcd_fsl_probe - initialize FSL-based HCDs
   * @drvier: Driver to be used for this HCD
   * @pdev: USB Host Controller being probed
   * Context: !in_interrupt()
   *
   * Allocates basic resources for this USB host controller.
   *
   */
  static int usb_hcd_fsl_probe(const struct hc_driver *driver,
  			     struct platform_device *pdev)
  {
  	struct fsl_usb2_platform_data *pdata;
  	struct usb_hcd *hcd;
  	struct resource *res;
  	int irq;
  	int retval;
  
  	pr_debug("initializing FSL-SOC USB Controller
  ");
  
  	/* Need platform data for setup */
  	pdata = dev_get_platdata(&pdev->dev);
  	if (!pdata) {
  		dev_err(&pdev->dev,
  			"No platform data for %s.
  ", dev_name(&pdev->dev));
  		return -ENODEV;
  	}
  
  	/*
  	 * This is a host mode driver, verify that we're supposed to be
  	 * in host mode.
  	 */
  	if (!((pdata->operating_mode == FSL_USB2_DR_HOST) ||
  	      (pdata->operating_mode == FSL_USB2_MPH_HOST) ||
  	      (pdata->operating_mode == FSL_USB2_DR_OTG))) {
  		dev_err(&pdev->dev,
  			"Non Host Mode configured for %s. Wrong driver linked.
  ",
  			dev_name(&pdev->dev));
  		return -ENODEV;
  	}
  
  	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
  	if (!res) {
  		dev_err(&pdev->dev,
  			"Found HC with no IRQ. Check %s setup!
  ",
  			dev_name(&pdev->dev));
  		return -ENODEV;
  	}
  	irq = res->start;
  
  	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  	if (!hcd) {
  		retval = -ENOMEM;
  		goto err1;
  	}
  
  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  	if (!res) {
  		dev_err(&pdev->dev,
  			"Found HC with no register addr. Check %s setup!
  ",
  			dev_name(&pdev->dev));
  		retval = -ENODEV;
  		goto err2;
  	}
  	hcd->rsrc_start = res->start;
  	hcd->rsrc_len = resource_size(res);
  	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  	if (IS_ERR(hcd->regs)) {
  		retval = PTR_ERR(hcd->regs);
  		goto err2;
  	}
  
  	pdata->regs = hcd->regs;
  
  	if (pdata->power_budget)
  		hcd->power_budget = pdata->power_budget;
  
  	/*
  	 * do platform specific init: check the clock, grab/config pins, etc.
  	 */
  	if (pdata->init && pdata->init(pdev)) {
  		retval = -ENODEV;
  		goto err2;
  	}
  
  	/* Enable USB controller, 83xx or 8536 */
  	if (pdata->have_sysif_regs && pdata->controller_ver < FSL_USB_VER_1_6)
  		setbits32(hcd->regs + FSL_SOC_USB_CTRL, 0x4);
  
  	/* Don't need to set host mode here. It will be done by tdi_reset() */
  
  	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
  	if (retval != 0)
  		goto err2;
  	device_wakeup_enable(hcd->self.controller);
  
  #ifdef CONFIG_USB_OTG
  	if (pdata->operating_mode == FSL_USB2_DR_OTG) {
  		struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  
  		hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
  		dev_dbg(&pdev->dev, "hcd=0x%p  ehci=0x%p, phy=0x%p
  ",
  			hcd, ehci, hcd->usb_phy);
  
  		if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
  			retval = otg_set_host(hcd->usb_phy->otg,
  					      &ehci_to_hcd(ehci)->self);
  			if (retval) {
  				usb_put_phy(hcd->usb_phy);
  				goto err2;
  			}
  		} else {
  			dev_err(&pdev->dev, "can't find phy
  ");
  			retval = -ENODEV;
  			goto err2;
  		}
  	}
  #endif
  	return retval;
  
        err2:
  	usb_put_hcd(hcd);
        err1:
  	dev_err(&pdev->dev, "init %s fail, %d
  ", dev_name(&pdev->dev), retval);
  	if (pdata->exit)
  		pdata->exit(pdev);
  	return retval;
  }
  
  /* may be called without controller electrically present */
  /* may be called with controller, bus, and devices active */
  
  /**
   * usb_hcd_fsl_remove - shutdown processing for FSL-based HCDs
   * @dev: USB Host Controller being removed
   * Context: !in_interrupt()
   *
   * Reverses the effect of usb_hcd_fsl_probe().
   *
   */
  static void usb_hcd_fsl_remove(struct usb_hcd *hcd,
  			       struct platform_device *pdev)
  {
  	struct fsl_usb2_platform_data *pdata = dev_get_platdata(&pdev->dev);
  
  	if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
  		otg_set_host(hcd->usb_phy->otg, NULL);
  		usb_put_phy(hcd->usb_phy);
  	}
  
  	usb_remove_hcd(hcd);
  
  	/*
  	 * do platform specific un-initialization:
  	 * release iomux pins, disable clock, etc.
  	 */
  	if (pdata->exit)
  		pdata->exit(pdev);
  	usb_put_hcd(hcd);
  }
  
  static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
  			       enum fsl_usb2_phy_modes phy_mode,
  			       unsigned int port_offset)
  {
  	u32 portsc;
  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  	void __iomem *non_ehci = hcd->regs;
  	struct device *dev = hcd->self.controller;
  	struct fsl_usb2_platform_data *pdata = dev_get_platdata(dev);
  
  	if (pdata->controller_ver < 0) {
  		dev_warn(hcd->self.controller, "Could not get controller version
  ");
  		return -ENODEV;
  	}
  
  	portsc = ehci_readl(ehci, &ehci->regs->port_status[port_offset]);
  	portsc &= ~(PORT_PTS_MSK | PORT_PTS_PTW);
  
  	switch (phy_mode) {
  	case FSL_USB2_PHY_ULPI:
  		if (pdata->have_sysif_regs && pdata->controller_ver) {
  			/* controller version 1.6 or above */
  			clrbits32(non_ehci + FSL_SOC_USB_CTRL, UTMI_PHY_EN);
  			setbits32(non_ehci + FSL_SOC_USB_CTRL,
  				ULPI_PHY_CLK_SEL | USB_CTRL_USB_EN);
  		}
  		portsc |= PORT_PTS_ULPI;
  		break;
  	case FSL_USB2_PHY_SERIAL:
  		portsc |= PORT_PTS_SERIAL;
  		break;
  	case FSL_USB2_PHY_UTMI_WIDE:
  		portsc |= PORT_PTS_PTW;
  		/* fall through */
  	case FSL_USB2_PHY_UTMI:
  		if (pdata->have_sysif_regs && pdata->controller_ver) {
  			/* controller version 1.6 or above */
  			setbits32(non_ehci + FSL_SOC_USB_CTRL, UTMI_PHY_EN);
  			mdelay(FSL_UTMI_PHY_DLY);  /* Delay for UTMI PHY CLK to
  						become stable - 10ms*/
  		}
  		/* enable UTMI PHY */
  		if (pdata->have_sysif_regs)
  			setbits32(non_ehci + FSL_SOC_USB_CTRL,
  				  CTRL_UTMI_PHY_EN);
  		portsc |= PORT_PTS_UTMI;
  		break;
  	case FSL_USB2_PHY_NONE:
  		break;
  	}
  
  	if (pdata->have_sysif_regs &&
  	    pdata->controller_ver > FSL_USB_VER_1_6 &&
  	    (phy_mode == FSL_USB2_PHY_ULPI)) {
  		/* check PHY_CLK_VALID to get phy clk valid */
  		if (!(spin_event_timeout(in_be32(non_ehci + FSL_SOC_USB_CTRL) &
  				PHY_CLK_VALID, FSL_USB_PHY_CLK_TIMEOUT, 0) ||
  				in_be32(non_ehci + FSL_SOC_USB_PRICTRL))) {
  			dev_warn(hcd->self.controller, "USB PHY clock invalid
  ");
  			return -EINVAL;
  		}
  	}
  
  	ehci_writel(ehci, portsc, &ehci->regs->port_status[port_offset]);
  
  	if (phy_mode != FSL_USB2_PHY_ULPI && pdata->have_sysif_regs)
  		setbits32(non_ehci + FSL_SOC_USB_CTRL, USB_CTRL_USB_EN);
  
  	return 0;
  }
  
  static int ehci_fsl_usb_setup(struct ehci_hcd *ehci)
  {
  	struct usb_hcd *hcd = ehci_to_hcd(ehci);
  	struct fsl_usb2_platform_data *pdata;
  	void __iomem *non_ehci = hcd->regs;
  
  	pdata = dev_get_platdata(hcd->self.controller);
  
  	if (pdata->have_sysif_regs) {
  		/*
  		* Turn on cache snooping hardware, since some PowerPC platforms
  		* wholly rely on hardware to deal with cache coherent
  		*/
  
  		/* Setup Snooping for all the 4GB space */
  		/* SNOOP1 starts from 0x0, size 2G */
  		out_be32(non_ehci + FSL_SOC_USB_SNOOP1, 0x0 | SNOOP_SIZE_2GB);
  		/* SNOOP2 starts from 0x80000000, size 2G */
  		out_be32(non_ehci + FSL_SOC_USB_SNOOP2, 0x80000000 | SNOOP_SIZE_2GB);
  	}
  
  	if ((pdata->operating_mode == FSL_USB2_DR_HOST) ||
  			(pdata->operating_mode == FSL_USB2_DR_OTG))
  		if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0))
  			return -EINVAL;
  
  	if (pdata->operating_mode == FSL_USB2_MPH_HOST) {
  		unsigned int chip, rev, svr;
  
  		svr = mfspr(SPRN_SVR);
  		chip = svr >> 16;
  		rev = (svr >> 4) & 0xf;
  
  		/* Deal with USB Erratum #14 on MPC834x Rev 1.0 & 1.1 chips */
  		if ((rev == 1) && (chip >= 0x8050) && (chip <= 0x8055))
  			ehci->has_fsl_port_bug = 1;
  
  		if (pdata->port_enables & FSL_USB2_PORT0_ENABLED)
  			if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0))
  				return -EINVAL;
  
  		if (pdata->port_enables & FSL_USB2_PORT1_ENABLED)
  			if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 1))
  				return -EINVAL;
  	}
  
  	if (pdata->have_sysif_regs) {
  #ifdef CONFIG_FSL_SOC_BOOKE
  		out_be32(non_ehci + FSL_SOC_USB_PRICTRL, 0x00000008);
  		out_be32(non_ehci + FSL_SOC_USB_AGECNTTHRSH, 0x00000080);
  #else
  		out_be32(non_ehci + FSL_SOC_USB_PRICTRL, 0x0000000c);
  		out_be32(non_ehci + FSL_SOC_USB_AGECNTTHRSH, 0x00000040);
  #endif
  		out_be32(non_ehci + FSL_SOC_USB_SICTRL, 0x00000001);
  	}
  
  	return 0;
  }
  
  /* called after powerup, by probe or system-pm "wakeup" */
  static int ehci_fsl_reinit(struct ehci_hcd *ehci)
  {
  	if (ehci_fsl_usb_setup(ehci))
  		return -EINVAL;
  
  	return 0;
  }
  
  /* called during probe() after chip reset completes */
  static int ehci_fsl_setup(struct usb_hcd *hcd)
  {
  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  	int retval;
  	struct fsl_usb2_platform_data *pdata;
  	struct device *dev;
  
  	dev = hcd->self.controller;
  	pdata = dev_get_platdata(hcd->self.controller);
  	ehci->big_endian_desc = pdata->big_endian_desc;
  	ehci->big_endian_mmio = pdata->big_endian_mmio;
  
  	/* EHCI registers start at offset 0x100 */
  	ehci->caps = hcd->regs + 0x100;
  
  #ifdef CONFIG_PPC_83xx
  	/*
  	 * Deal with MPC834X that need port power to be cycled after the power
  	 * fault condition is removed. Otherwise the state machine does not
  	 * reflect PORTSC[CSC] correctly.
  	 */
  	ehci->need_oc_pp_cycle = 1;
  #endif
  
  	hcd->has_tt = 1;
  
  	retval = ehci_setup(hcd);
  	if (retval)
  		return retval;
  
  	if (of_device_is_compatible(dev->parent->of_node,
  				    "fsl,mpc5121-usb2-dr")) {
  		/*
  		 * set SBUSCFG:AHBBRST so that control msgs don't
  		 * fail when doing heavy PATA writes.
  		 */
  		ehci_writel(ehci, SBUSCFG_INCR8,
  			    hcd->regs + FSL_SOC_USB_SBUSCFG);
  	}
  
  	retval = ehci_fsl_reinit(ehci);
  	return retval;
  }
  
  struct ehci_fsl {
  	struct ehci_hcd	ehci;
  
  #ifdef CONFIG_PM
  	/* Saved USB PHY settings, need to restore after deep sleep. */
  	u32 usb_ctrl;
  #endif
  };
  
  #ifdef CONFIG_PM
  
  #ifdef CONFIG_PPC_MPC512x
  static int ehci_fsl_mpc512x_drv_suspend(struct device *dev)
  {
  	struct usb_hcd *hcd = dev_get_drvdata(dev);
  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  	struct fsl_usb2_platform_data *pdata = dev_get_platdata(dev);
  	u32 tmp;
  
  #ifdef CONFIG_DYNAMIC_DEBUG
  	u32 mode = ehci_readl(ehci, hcd->regs + FSL_SOC_USB_USBMODE);
  	mode &= USBMODE_CM_MASK;
  	tmp = ehci_readl(ehci, hcd->regs + 0x140);	/* usbcmd */
  
  	dev_dbg(dev, "suspend=%d already_suspended=%d "
  		"mode=%d  usbcmd %08x
  ", pdata->suspended,
  		pdata->already_suspended, mode, tmp);
  #endif
  
  	/*
  	 * If the controller is already suspended, then this must be a
  	 * PM suspend.  Remember this fact, so that we will leave the
  	 * controller suspended at PM resume time.
  	 */
  	if (pdata->suspended) {
  		dev_dbg(dev, "already suspended, leaving early
  ");
  		pdata->already_suspended = 1;
  		return 0;
  	}
  
  	dev_dbg(dev, "suspending...
  ");
  
  	ehci->rh_state = EHCI_RH_SUSPENDED;
  	dev->power.power_state = PMSG_SUSPEND;
  
  	/* ignore non-host interrupts */
  	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  
  	/* stop the controller */
  	tmp = ehci_readl(ehci, &ehci->regs->command);
  	tmp &= ~CMD_RUN;
  	ehci_writel(ehci, tmp, &ehci->regs->command);
  
  	/* save EHCI registers */
  	pdata->pm_command = ehci_readl(ehci, &ehci->regs->command);
  	pdata->pm_command &= ~CMD_RUN;
  	pdata->pm_status  = ehci_readl(ehci, &ehci->regs->status);
  	pdata->pm_intr_enable  = ehci_readl(ehci, &ehci->regs->intr_enable);
  	pdata->pm_frame_index  = ehci_readl(ehci, &ehci->regs->frame_index);
  	pdata->pm_segment  = ehci_readl(ehci, &ehci->regs->segment);
  	pdata->pm_frame_list  = ehci_readl(ehci, &ehci->regs->frame_list);
  	pdata->pm_async_next  = ehci_readl(ehci, &ehci->regs->async_next);
  	pdata->pm_configured_flag  =
  		ehci_readl(ehci, &ehci->regs->configured_flag);
  	pdata->pm_portsc = ehci_readl(ehci, &ehci->regs->port_status[0]);
  	pdata->pm_usbgenctrl = ehci_readl(ehci,
  					  hcd->regs + FSL_SOC_USB_USBGENCTRL);
  
  	/* clear the W1C bits */
  	pdata->pm_portsc &= cpu_to_hc32(ehci, ~PORT_RWC_BITS);
  
  	pdata->suspended = 1;
  
  	/* clear PP to cut power to the port */
  	tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);
  	tmp &= ~PORT_POWER;
  	ehci_writel(ehci, tmp, &ehci->regs->port_status[0]);
  
  	return 0;
  }
  
  static int ehci_fsl_mpc512x_drv_resume(struct device *dev)
  {
  	struct usb_hcd *hcd = dev_get_drvdata(dev);
  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  	struct fsl_usb2_platform_data *pdata = dev_get_platdata(dev);
  	u32 tmp;
  
  	dev_dbg(dev, "suspend=%d already_suspended=%d
  ",
  		pdata->suspended, pdata->already_suspended);
  
  	/*
  	 * If the controller was already suspended at suspend time,
  	 * then don't resume it now.
  	 */
  	if (pdata->already_suspended) {
  		dev_dbg(dev, "already suspended, leaving early
  ");
  		pdata->already_suspended = 0;
  		return 0;
  	}
  
  	if (!pdata->suspended) {
  		dev_dbg(dev, "not suspended, leaving early
  ");
  		return 0;
  	}
  
  	pdata->suspended = 0;
  
  	dev_dbg(dev, "resuming...
  ");
  
  	/* set host mode */
  	tmp = USBMODE_CM_HOST | (pdata->es ? USBMODE_ES : 0);
  	ehci_writel(ehci, tmp, hcd->regs + FSL_SOC_USB_USBMODE);
  
  	ehci_writel(ehci, pdata->pm_usbgenctrl,
  		    hcd->regs + FSL_SOC_USB_USBGENCTRL);
  	ehci_writel(ehci, ISIPHYCTRL_PXE | ISIPHYCTRL_PHYE,
  		    hcd->regs + FSL_SOC_USB_ISIPHYCTRL);
  
  	ehci_writel(ehci, SBUSCFG_INCR8, hcd->regs + FSL_SOC_USB_SBUSCFG);
  
  	/* restore EHCI registers */
  	ehci_writel(ehci, pdata->pm_command, &ehci->regs->command);
  	ehci_writel(ehci, pdata->pm_intr_enable, &ehci->regs->intr_enable);
  	ehci_writel(ehci, pdata->pm_frame_index, &ehci->regs->frame_index);
  	ehci_writel(ehci, pdata->pm_segment, &ehci->regs->segment);
  	ehci_writel(ehci, pdata->pm_frame_list, &ehci->regs->frame_list);
  	ehci_writel(ehci, pdata->pm_async_next, &ehci->regs->async_next);
  	ehci_writel(ehci, pdata->pm_configured_flag,
  		    &ehci->regs->configured_flag);
  	ehci_writel(ehci, pdata->pm_portsc, &ehci->regs->port_status[0]);
  
  	set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
  	ehci->rh_state = EHCI_RH_RUNNING;
  	dev->power.power_state = PMSG_ON;
  
  	tmp = ehci_readl(ehci, &ehci->regs->command);
  	tmp |= CMD_RUN;
  	ehci_writel(ehci, tmp, &ehci->regs->command);
  
  	usb_hcd_resume_root_hub(hcd);
  
  	return 0;
  }
  #else
  static inline int ehci_fsl_mpc512x_drv_suspend(struct device *dev)
  {
  	return 0;
  }
  
  static inline int ehci_fsl_mpc512x_drv_resume(struct device *dev)
  {
  	return 0;
  }
  #endif /* CONFIG_PPC_MPC512x */
  
  static struct ehci_fsl *hcd_to_ehci_fsl(struct usb_hcd *hcd)
  {
  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  
  	return container_of(ehci, struct ehci_fsl, ehci);
  }
  
  static int ehci_fsl_drv_suspend(struct device *dev)
  {
  	struct usb_hcd *hcd = dev_get_drvdata(dev);
  	struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
  	void __iomem *non_ehci = hcd->regs;
  
  	if (of_device_is_compatible(dev->parent->of_node,
  				    "fsl,mpc5121-usb2-dr")) {
  		return ehci_fsl_mpc512x_drv_suspend(dev);
  	}
  
  	ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd),
  			device_may_wakeup(dev));
  	if (!fsl_deep_sleep())
  		return 0;
  
  	ehci_fsl->usb_ctrl = in_be32(non_ehci + FSL_SOC_USB_CTRL);
  	return 0;
  }
  
  static int ehci_fsl_drv_resume(struct device *dev)
  {
  	struct usb_hcd *hcd = dev_get_drvdata(dev);
  	struct ehci_fsl *ehci_fsl = hcd_to_ehci_fsl(hcd);
  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  	void __iomem *non_ehci = hcd->regs;
  
  	if (of_device_is_compatible(dev->parent->of_node,
  				    "fsl,mpc5121-usb2-dr")) {
  		return ehci_fsl_mpc512x_drv_resume(dev);
  	}
  
  	ehci_prepare_ports_for_controller_resume(ehci);
  	if (!fsl_deep_sleep())
  		return 0;
  
  	usb_root_hub_lost_power(hcd->self.root_hub);
  
  	/* Restore USB PHY settings and enable the controller. */
  	out_be32(non_ehci + FSL_SOC_USB_CTRL, ehci_fsl->usb_ctrl);
  
  	ehci_reset(ehci);
  	ehci_fsl_reinit(ehci);
  
  	return 0;
  }
  
  static int ehci_fsl_drv_restore(struct device *dev)
  {
  	struct usb_hcd *hcd = dev_get_drvdata(dev);
  
  	usb_root_hub_lost_power(hcd->self.root_hub);
  	return 0;
  }
  
  static struct dev_pm_ops ehci_fsl_pm_ops = {
  	.suspend = ehci_fsl_drv_suspend,
  	.resume = ehci_fsl_drv_resume,
  	.restore = ehci_fsl_drv_restore,
  };
  
  #define EHCI_FSL_PM_OPS		(&ehci_fsl_pm_ops)
  #else
  #define EHCI_FSL_PM_OPS		NULL
  #endif /* CONFIG_PM */
  
  #ifdef CONFIG_USB_OTG
  static int ehci_start_port_reset(struct usb_hcd *hcd, unsigned port)
  {
  	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  	u32 status;
  
  	if (!port)
  		return -EINVAL;
  
  	port--;
  
  	/* start port reset before HNP protocol time out */
  	status = readl(&ehci->regs->port_status[port]);
  	if (!(status & PORT_CONNECT))
  		return -ENODEV;
  
  	/* khubd will finish the reset later */
  	if (ehci_is_TDI(ehci)) {
  		writel(PORT_RESET |
  		       (status & ~(PORT_CSC | PORT_PEC | PORT_OCC)),
  		       &ehci->regs->port_status[port]);
  	} else {
  		writel(PORT_RESET, &ehci->regs->port_status[port]);
  	}
  
  	return 0;
  }
  #else
  #define ehci_start_port_reset	NULL
  #endif /* CONFIG_USB_OTG */
  
  
  static const struct hc_driver ehci_fsl_hc_driver = {
  	.description = hcd_name,
  	.product_desc = "Freescale On-Chip EHCI Host Controller",
  	.hcd_priv_size = sizeof(struct ehci_fsl),
  
  	/*
  	 * generic hardware linkage
  	 */
  	.irq = ehci_irq,
  	.flags = HCD_USB2 | HCD_MEMORY | HCD_BH,
  
  	/*
  	 * basic lifecycle operations
  	 */
  	.reset = ehci_fsl_setup,
  	.start = ehci_run,
  	.stop = ehci_stop,
  	.shutdown = ehci_shutdown,
  
  	/*
  	 * managing i/o requests and associated device resources
  	 */
  	.urb_enqueue = ehci_urb_enqueue,
  	.urb_dequeue = ehci_urb_dequeue,
  	.endpoint_disable = ehci_endpoint_disable,
  	.endpoint_reset = ehci_endpoint_reset,
  
  	/*
  	 * scheduling support
  	 */
  	.get_frame_number = ehci_get_frame,
  
  	/*
  	 * root hub support
  	 */
  	.hub_status_data = ehci_hub_status_data,
  	.hub_control = ehci_hub_control,
  	.bus_suspend = ehci_bus_suspend,
  	.bus_resume = ehci_bus_resume,
  	.start_port_reset = ehci_start_port_reset,
  	.relinquish_port = ehci_relinquish_port,
  	.port_handed_over = ehci_port_handed_over,
  
  	.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
  };
  
  static int ehci_fsl_drv_probe(struct platform_device *pdev)
  {
  	if (usb_disabled())
  		return -ENODEV;
  
  	/* FIXME we only want one one probe() not two */
  	return usb_hcd_fsl_probe(&ehci_fsl_hc_driver, pdev);
  }
  
  static int ehci_fsl_drv_remove(struct platform_device *pdev)
  {
  	struct usb_hcd *hcd = platform_get_drvdata(pdev);
  
  	/* FIXME we only want one one remove() not two */
  	usb_hcd_fsl_remove(hcd, pdev);
  	return 0;
  }
  
  MODULE_ALIAS("platform:fsl-ehci");
  
  static struct platform_driver ehci_fsl_driver = {
  	.probe = ehci_fsl_drv_probe,
  	.remove = ehci_fsl_drv_remove,
  	.shutdown = usb_hcd_platform_shutdown,
  	.driver = {
  		.name = "fsl-ehci",
  		.owner	= THIS_MODULE,
  		.pm = EHCI_FSL_PM_OPS,
  	},
  };