/*
   * Freescale QUICC Engine USB Host Controller Driver
   *
   * Copyright (c) Freescale Semicondutor, Inc. 2006.
   *               Shlomi Gridish <gridish@freescale.com>
   *               Jerry Huang <Chang-Ming.Huang@freescale.com>
   * Copyright (c) Logic Product Development, Inc. 2007
   *               Peter Barada <peterb@logicpd.com>
   * Copyright (c) MontaVista Software, Inc. 2008.
   *               Anton Vorontsov <avorontsov@ru.mvista.com>
   *
   * 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.
   */
  
  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/spinlock.h>
  #include <linux/kernel.h>
  #include <linux/delay.h>
  #include <linux/errno.h>
  #include <linux/list.h>
  #include <linux/interrupt.h>
  #include <linux/io.h>
  #include <linux/usb.h>
  #include <linux/usb/hcd.h>
  #include <linux/of_address.h>
  #include <linux/of_irq.h>
  #include <linux/of_platform.h>
  #include <linux/of_gpio.h>
  #include <linux/slab.h>
  #include <asm/qe.h>
  #include <asm/fsl_gtm.h>
  #include "fhci.h"
  
  void fhci_start_sof_timer(struct fhci_hcd *fhci)
  {
  	fhci_dbg(fhci, "-> %s
  ", __func__);
  
  	/* clear frame_n */
  	out_be16(&fhci->pram->frame_num, 0);
  
  	out_be16(&fhci->regs->usb_ussft, 0);
  	setbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
  
  	fhci_dbg(fhci, "<- %s
  ", __func__);
  }
  
  void fhci_stop_sof_timer(struct fhci_hcd *fhci)
  {
  	fhci_dbg(fhci, "-> %s
  ", __func__);
  
  	clrbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
  	gtm_stop_timer16(fhci->timer);
  
  	fhci_dbg(fhci, "<- %s
  ", __func__);
  }
  
  u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
  {
  	return be16_to_cpu(in_be16(&usb->fhci->regs->usb_ussft) / 12);
  }
  
  /* initialize the endpoint zero */
  static u32 endpoint_zero_init(struct fhci_usb *usb,
  			      enum fhci_mem_alloc data_mem,
  			      u32 ring_len)
  {
  	u32 rc;
  
  	rc = fhci_create_ep(usb, data_mem, ring_len);
  	if (rc)
  		return rc;
  
  	/* inilialize endpoint registers */
  	fhci_init_ep_registers(usb, usb->ep0, data_mem);
  
  	return 0;
  }
  
  /* enable the USB interrupts */
  void fhci_usb_enable_interrupt(struct fhci_usb *usb)
  {
  	struct fhci_hcd *fhci = usb->fhci;
  
  	if (usb->intr_nesting_cnt == 1) {
  		/* initialize the USB interrupt */
  		enable_irq(fhci_to_hcd(fhci)->irq);
  
  		/* initialize the event register and mask register */
  		out_be16(&usb->fhci->regs->usb_usber, 0xffff);
  		out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
  
  		/* enable the timer interrupts */
  		enable_irq(fhci->timer->irq);
  	} else if (usb->intr_nesting_cnt > 1)
  		fhci_info(fhci, "unbalanced USB interrupts nesting
  ");
  	usb->intr_nesting_cnt--;
  }
  
  /* disable the usb interrupt */
  void fhci_usb_disable_interrupt(struct fhci_usb *usb)
  {
  	struct fhci_hcd *fhci = usb->fhci;
  
  	if (usb->intr_nesting_cnt == 0) {
  		/* disable the timer interrupt */
  		disable_irq_nosync(fhci->timer->irq);
  
  		/* disable the usb interrupt */
  		disable_irq_nosync(fhci_to_hcd(fhci)->irq);
  		out_be16(&usb->fhci->regs->usb_usbmr, 0);
  	}
  	usb->intr_nesting_cnt++;
  }
  
  /* enable the USB controller */
  static u32 fhci_usb_enable(struct fhci_hcd *fhci)
  {
  	struct fhci_usb *usb = fhci->usb_lld;
  
  	out_be16(&usb->fhci->regs->usb_usber, 0xffff);
  	out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
  	setbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
  
  	mdelay(100);
  
  	return 0;
  }
  
  /* disable the USB controller */
  static u32 fhci_usb_disable(struct fhci_hcd *fhci)
  {
  	struct fhci_usb *usb = fhci->usb_lld;
  
  	fhci_usb_disable_interrupt(usb);
  	fhci_port_disable(fhci);
  
  	/* disable the usb controller */
  	if (usb->port_status == FHCI_PORT_FULL ||
  			usb->port_status == FHCI_PORT_LOW)
  		fhci_device_disconnected_interrupt(fhci);
  
  	clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
  
  	return 0;
  }
  
  /* check the bus state by polling the QE bit on the IO ports */
  int fhci_ioports_check_bus_state(struct fhci_hcd *fhci)
  {
  	u8 bits = 0;
  
  	/* check USBOE,if transmitting,exit */
  	if (!gpio_get_value(fhci->gpios[GPIO_USBOE]))
  		return -1;
  
  	/* check USBRP */
  	if (gpio_get_value(fhci->gpios[GPIO_USBRP]))
  		bits |= 0x2;
  
  	/* check USBRN */
  	if (gpio_get_value(fhci->gpios[GPIO_USBRN]))
  		bits |= 0x1;
  
  	return bits;
  }
  
  static void fhci_mem_free(struct fhci_hcd *fhci)
  {
  	struct ed *ed;
  	struct ed *next_ed;
  	struct td *td;
  	struct td *next_td;
  
  	list_for_each_entry_safe(ed, next_ed, &fhci->empty_eds, node) {
  		list_del(&ed->node);
  		kfree(ed);
  	}
  
  	list_for_each_entry_safe(td, next_td, &fhci->empty_tds, node) {
  		list_del(&td->node);
  		kfree(td);
  	}
  
  	kfree(fhci->vroot_hub);
  	fhci->vroot_hub = NULL;
  
  	kfree(fhci->hc_list);
  	fhci->hc_list = NULL;
  }
  
  static int fhci_mem_init(struct fhci_hcd *fhci)
  {
  	int i;
  
  	fhci->hc_list = kzalloc(sizeof(*fhci->hc_list), GFP_KERNEL);
  	if (!fhci->hc_list)
  		goto err;
  
  	INIT_LIST_HEAD(&fhci->hc_list->ctrl_list);
  	INIT_LIST_HEAD(&fhci->hc_list->bulk_list);
  	INIT_LIST_HEAD(&fhci->hc_list->iso_list);
  	INIT_LIST_HEAD(&fhci->hc_list->intr_list);
  	INIT_LIST_HEAD(&fhci->hc_list->done_list);
  
  	fhci->vroot_hub = kzalloc(sizeof(*fhci->vroot_hub), GFP_KERNEL);
  	if (!fhci->vroot_hub)
  		goto err;
  
  	INIT_LIST_HEAD(&fhci->empty_eds);
  	INIT_LIST_HEAD(&fhci->empty_tds);
  
  	/* initialize work queue to handle done list */
  	fhci_tasklet.data = (unsigned long)fhci;
  	fhci->process_done_task = &fhci_tasklet;
  
  	for (i = 0; i < MAX_TDS; i++) {
  		struct td *td;
  
  		td = kmalloc(sizeof(*td), GFP_KERNEL);
  		if (!td)
  			goto err;
  		fhci_recycle_empty_td(fhci, td);
  	}
  	for (i = 0; i < MAX_EDS; i++) {
  		struct ed *ed;
  
  		ed = kmalloc(sizeof(*ed), GFP_KERNEL);
  		if (!ed)
  			goto err;
  		fhci_recycle_empty_ed(fhci, ed);
  	}
  
  	fhci->active_urbs = 0;
  	return 0;
  err:
  	fhci_mem_free(fhci);
  	return -ENOMEM;
  }
  
  /* destroy the fhci_usb structure */
  static void fhci_usb_free(void *lld)
  {
  	struct fhci_usb *usb = lld;
  	struct fhci_hcd *fhci;
  
  	if (usb) {
  		fhci = usb->fhci;
  		fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
  		fhci_ep0_free(usb);
  		kfree(usb->actual_frame);
  		kfree(usb);
  	}
  }
  
  /* initialize the USB */
  static int fhci_usb_init(struct fhci_hcd *fhci)
  {
  	struct fhci_usb *usb = fhci->usb_lld;
  
  	memset_io(usb->fhci->pram, 0, FHCI_PRAM_SIZE);
  
  	usb->port_status = FHCI_PORT_DISABLED;
  	usb->max_frame_usage = FRAME_TIME_USAGE;
  	usb->sw_transaction_time = SW_FIX_TIME_BETWEEN_TRANSACTION;
  
  	usb->actual_frame = kzalloc(sizeof(*usb->actual_frame), GFP_KERNEL);
  	if (!usb->actual_frame) {
  		fhci_usb_free(usb);
  		return -ENOMEM;
  	}
  
  	INIT_LIST_HEAD(&usb->actual_frame->tds_list);
  
  	/* initializing registers on chip, clear frame number */
  	out_be16(&fhci->pram->frame_num, 0);
  
  	/* clear rx state */
  	out_be32(&fhci->pram->rx_state, 0);
  
  	/* set mask register */
  	usb->saved_msk = (USB_E_TXB_MASK |
  			  USB_E_TXE1_MASK |
  			  USB_E_IDLE_MASK |
  			  USB_E_RESET_MASK | USB_E_SFT_MASK | USB_E_MSF_MASK);
  
  	out_8(&usb->fhci->regs->usb_usmod, USB_MODE_HOST | USB_MODE_EN);
  
  	/* clearing the mask register */
  	out_be16(&usb->fhci->regs->usb_usbmr, 0);
  
  	/* initialing the event register */
  	out_be16(&usb->fhci->regs->usb_usber, 0xffff);
  
  	if (endpoint_zero_init(usb, DEFAULT_DATA_MEM, DEFAULT_RING_LEN) != 0) {
  		fhci_usb_free(usb);
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  /* initialize the fhci_usb struct and the corresponding data staruct */
  static struct fhci_usb *fhci_create_lld(struct fhci_hcd *fhci)
  {
  	struct fhci_usb *usb;
  
  	/* allocate memory for SCC data structure */
  	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
  	if (!usb) {
  		fhci_err(fhci, "no memory for SCC data struct
  ");
  		return NULL;
  	}
  
  	usb->fhci = fhci;
  	usb->hc_list = fhci->hc_list;
  	usb->vroot_hub = fhci->vroot_hub;
  
  	usb->transfer_confirm = fhci_transfer_confirm_callback;
  
  	return usb;
  }
  
  static int fhci_start(struct usb_hcd *hcd)
  {
  	int ret;
  	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
  
  	ret = fhci_mem_init(fhci);
  	if (ret) {
  		fhci_err(fhci, "failed to allocate memory
  ");
  		goto err;
  	}
  
  	fhci->usb_lld = fhci_create_lld(fhci);
  	if (!fhci->usb_lld) {
  		fhci_err(fhci, "low level driver config failed
  ");
  		ret = -ENOMEM;
  		goto err;
  	}
  
  	ret = fhci_usb_init(fhci);
  	if (ret) {
  		fhci_err(fhci, "low level driver initialize failed
  ");
  		goto err;
  	}
  
  	spin_lock_init(&fhci->lock);
  
  	/* connect the virtual root hub */
  	fhci->vroot_hub->dev_num = 1;	/* this field may be needed to fix */
  	fhci->vroot_hub->hub.wHubStatus = 0;
  	fhci->vroot_hub->hub.wHubChange = 0;
  	fhci->vroot_hub->port.wPortStatus = 0;
  	fhci->vroot_hub->port.wPortChange = 0;
  
  	hcd->state = HC_STATE_RUNNING;
  
  	/*
  	 * From here on, khubd concurrently accesses the root
  	 * hub; drivers will be talking to enumerated devices.
  	 * (On restart paths, khubd already knows about the root
  	 * hub and could find work as soon as we wrote FLAG_CF.)
  	 *
  	 * Before this point the HC was idle/ready.  After, khubd
  	 * and device drivers may start it running.
  	 */
  	fhci_usb_enable(fhci);
  	return 0;
  err:
  	fhci_mem_free(fhci);
  	return ret;
  }
  
  static void fhci_stop(struct usb_hcd *hcd)
  {
  	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
  
  	fhci_usb_disable_interrupt(fhci->usb_lld);
  	fhci_usb_disable(fhci);
  
  	fhci_usb_free(fhci->usb_lld);
  	fhci->usb_lld = NULL;
  	fhci_mem_free(fhci);
  }
  
  static int fhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
  			    gfp_t mem_flags)
  {
  	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
  	u32 pipe = urb->pipe;
  	int ret;
  	int i;
  	int size = 0;
  	struct urb_priv *urb_priv;
  	unsigned long flags;
  
  	switch (usb_pipetype(pipe)) {
  	case PIPE_CONTROL:
  		/* 1 td fro setup,1 for ack */
  		size = 2;
  	case PIPE_BULK:
  		/* one td for every 4096 bytes(can be up to 8k) */
  		size += urb->transfer_buffer_length / 4096;
  		/* ...add for any remaining bytes... */
  		if ((urb->transfer_buffer_length % 4096) != 0)
  			size++;
  		/* ..and maybe a zero length packet to wrap it up */
  		if (size == 0)
  			size++;
  		else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
  			 && (urb->transfer_buffer_length
  			     % usb_maxpacket(urb->dev, pipe,
  					     usb_pipeout(pipe))) != 0)
  			size++;
  		break;
  	case PIPE_ISOCHRONOUS:
  		size = urb->number_of_packets;
  		if (size <= 0)
  			return -EINVAL;
  		for (i = 0; i < urb->number_of_packets; i++) {
  			urb->iso_frame_desc[i].actual_length = 0;
  			urb->iso_frame_desc[i].status = (u32) (-EXDEV);
  		}
  		break;
  	case PIPE_INTERRUPT:
  		size = 1;
  	}
  
  	/* allocate the private part of the URB */
  	urb_priv = kzalloc(sizeof(*urb_priv), mem_flags);
  	if (!urb_priv)
  		return -ENOMEM;
  
  	/* allocate the private part of the URB */
  	urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
  	if (!urb_priv->tds) {
  		kfree(urb_priv);
  		return -ENOMEM;
  	}
  
  	spin_lock_irqsave(&fhci->lock, flags);
  
  	ret = usb_hcd_link_urb_to_ep(hcd, urb);
  	if (ret)
  		goto err;
  
  	/* fill the private part of the URB */
  	urb_priv->num_of_tds = size;
  
  	urb->status = -EINPROGRESS;
  	urb->actual_length = 0;
  	urb->error_count = 0;
  	urb->hcpriv = urb_priv;
  
  	fhci_queue_urb(fhci, urb);
  err:
  	if (ret) {
  		kfree(urb_priv->tds);
  		kfree(urb_priv);
  	}
  	spin_unlock_irqrestore(&fhci->lock, flags);
  	return ret;
  }
  
  /* dequeue FHCI URB */
  static int fhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
  {
  	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
  	struct fhci_usb *usb = fhci->usb_lld;
  	int ret = -EINVAL;
  	unsigned long flags;
  
  	if (!urb || !urb->dev || !urb->dev->bus)
  		goto out;
  
  	spin_lock_irqsave(&fhci->lock, flags);
  
  	ret = usb_hcd_check_unlink_urb(hcd, urb, status);
  	if (ret)
  		goto out2;
  
  	if (usb->port_status != FHCI_PORT_DISABLED) {
  		struct urb_priv *urb_priv;
  
  		/*
  		 * flag the urb's data for deletion in some upcoming
  		 * SF interrupt's delete list processing
  		 */
  		urb_priv = urb->hcpriv;
  
  		if (!urb_priv || (urb_priv->state == URB_DEL))
  			goto out2;
  
  		urb_priv->state = URB_DEL;
  
  		/* already pending? */
  		urb_priv->ed->state = FHCI_ED_URB_DEL;
  	} else {
  		fhci_urb_complete_free(fhci, urb);
  	}
  
  out2:
  	spin_unlock_irqrestore(&fhci->lock, flags);
  out:
  	return ret;
  }
  
  static void fhci_endpoint_disable(struct usb_hcd *hcd,
  				  struct usb_host_endpoint *ep)
  {
  	struct fhci_hcd *fhci;
  	struct ed *ed;
  	unsigned long flags;
  
  	fhci = hcd_to_fhci(hcd);
  	spin_lock_irqsave(&fhci->lock, flags);
  	ed = ep->hcpriv;
  	if (ed) {
  		while (ed->td_head != NULL) {
  			struct td *td = fhci_remove_td_from_ed(ed);
  			fhci_urb_complete_free(fhci, td->urb);
  		}
  		fhci_recycle_empty_ed(fhci, ed);
  		ep->hcpriv = NULL;
  	}
  	spin_unlock_irqrestore(&fhci->lock, flags);
  }
  
  static int fhci_get_frame_number(struct usb_hcd *hcd)
  {
  	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
  
  	return get_frame_num(fhci);
  }
  
  static const struct hc_driver fhci_driver = {
  	.description = "fsl,usb-fhci",
  	.product_desc = "FHCI HOST Controller",
  	.hcd_priv_size = sizeof(struct fhci_hcd),
  
  	/* generic hardware linkage */
  	.irq = fhci_irq,
  	.flags = HCD_USB11 | HCD_MEMORY,
  
  	/* basic lifecycle operation */
  	.start = fhci_start,
  	.stop = fhci_stop,
  
  	/* managing i/o requests and associated device resources */
  	.urb_enqueue = fhci_urb_enqueue,
  	.urb_dequeue = fhci_urb_dequeue,
  	.endpoint_disable = fhci_endpoint_disable,
  
  	/* scheduling support */
  	.get_frame_number = fhci_get_frame_number,
  
  	/* root hub support */
  	.hub_status_data = fhci_hub_status_data,
  	.hub_control = fhci_hub_control,
  };
  
  static int of_fhci_probe(struct platform_device *ofdev)
  {
  	struct device *dev = &ofdev->dev;
  	struct device_node *node = dev->of_node;
  	struct usb_hcd *hcd;
  	struct fhci_hcd *fhci;
  	struct resource usb_regs;
  	unsigned long pram_addr;
  	unsigned int usb_irq;
  	const char *sprop;
  	const u32 *iprop;
  	int size;
  	int ret;
  	int i;
  	int j;
  
  	if (usb_disabled())
  		return -ENODEV;
  
  	sprop = of_get_property(node, "mode", NULL);
  	if (sprop && strcmp(sprop, "host"))
  		return -ENODEV;
  
  	hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
  	if (!hcd) {
  		dev_err(dev, "could not create hcd
  ");
  		return -ENOMEM;
  	}
  
  	fhci = hcd_to_fhci(hcd);
  	hcd->self.controller = dev;
  	dev_set_drvdata(dev, hcd);
  
  	iprop = of_get_property(node, "hub-power-budget", &size);
  	if (iprop && size == sizeof(*iprop))
  		hcd->power_budget = *iprop;
  
  	/* FHCI registers. */
  	ret = of_address_to_resource(node, 0, &usb_regs);
  	if (ret) {
  		dev_err(dev, "could not get regs
  ");
  		goto err_regs;
  	}
  
  	hcd->regs = ioremap(usb_regs.start, resource_size(&usb_regs));
  	if (!hcd->regs) {
  		dev_err(dev, "could not ioremap regs
  ");
  		ret = -ENOMEM;
  		goto err_regs;
  	}
  	fhci->regs = hcd->regs;
  
  	/* Parameter RAM. */
  	iprop = of_get_property(node, "reg", &size);
  	if (!iprop || size < sizeof(*iprop) * 4) {
  		dev_err(dev, "can't get pram offset
  ");
  		ret = -EINVAL;
  		goto err_pram;
  	}
  
  	pram_addr = cpm_muram_alloc(FHCI_PRAM_SIZE, 64);
  	if (IS_ERR_VALUE(pram_addr)) {
  		dev_err(dev, "failed to allocate usb pram
  ");
  		ret = -ENOMEM;
  		goto err_pram;
  	}
  
  	qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, QE_CR_SUBBLOCK_USB,
  		     QE_CR_PROTOCOL_UNSPECIFIED, pram_addr);
  	fhci->pram = cpm_muram_addr(pram_addr);
  
  	/* GPIOs and pins */
  	for (i = 0; i < NUM_GPIOS; i++) {
  		int gpio;
  		enum of_gpio_flags flags;
  
  		gpio = of_get_gpio_flags(node, i, &flags);
  		fhci->gpios[i] = gpio;
  		fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;
  
  		if (!gpio_is_valid(gpio)) {
  			if (i < GPIO_SPEED) {
  				dev_err(dev, "incorrect GPIO%d: %d
  ",
  					i, gpio);
  				goto err_gpios;
  			} else {
  				dev_info(dev, "assuming board doesn't have "
  					"%s gpio
  ", i == GPIO_SPEED ?
  					"speed" : "power");
  				continue;
  			}
  		}
  
  		ret = gpio_request(gpio, dev_name(dev));
  		if (ret) {
  			dev_err(dev, "failed to request gpio %d", i);
  			goto err_gpios;
  		}
  
  		if (i >= GPIO_SPEED) {
  			ret = gpio_direction_output(gpio, 0);
  			if (ret) {
  				dev_err(dev, "failed to set gpio %d as "
  					"an output
  ", i);
  				i++;
  				goto err_gpios;
  			}
  		}
  	}
  
  	for (j = 0; j < NUM_PINS; j++) {
  		fhci->pins[j] = qe_pin_request(node, j);
  		if (IS_ERR(fhci->pins[j])) {
  			ret = PTR_ERR(fhci->pins[j]);
  			dev_err(dev, "can't get pin %d: %d
  ", j, ret);
  			goto err_pins;
  		}
  	}
  
  	/* Frame limit timer and its interrupt. */
  	fhci->timer = gtm_get_timer16();
  	if (IS_ERR(fhci->timer)) {
  		ret = PTR_ERR(fhci->timer);
  		dev_err(dev, "failed to request qe timer: %i", ret);
  		goto err_get_timer;
  	}
  
  	ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
  			  0, "qe timer (usb)", hcd);
  	if (ret) {
  		dev_err(dev, "failed to request timer irq");
  		goto err_timer_irq;
  	}
  
  	/* USB Host interrupt. */
  	usb_irq = irq_of_parse_and_map(node, 0);
  	if (usb_irq == NO_IRQ) {
  		dev_err(dev, "could not get usb irq
  ");
  		ret = -EINVAL;
  		goto err_usb_irq;
  	}
  
  	/* Clocks. */
  	sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
  	if (sprop) {
  		fhci->fullspeed_clk = qe_clock_source(sprop);
  		if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
  			dev_err(dev, "wrong fullspeed-clock
  ");
  			ret = -EINVAL;
  			goto err_clocks;
  		}
  	}
  
  	sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
  	if (sprop) {
  		fhci->lowspeed_clk = qe_clock_source(sprop);
  		if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
  			dev_err(dev, "wrong lowspeed-clock
  ");
  			ret = -EINVAL;
  			goto err_clocks;
  		}
  	}
  
  	if (fhci->fullspeed_clk == QE_CLK_NONE &&
  			fhci->lowspeed_clk == QE_CLK_NONE) {
  		dev_err(dev, "no clocks specified
  ");
  		ret = -EINVAL;
  		goto err_clocks;
  	}
  
  	dev_info(dev, "at 0x%p, irq %d
  ", hcd->regs, usb_irq);
  
  	fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
  
  	/* Start with full-speed, if possible. */
  	if (fhci->fullspeed_clk != QE_CLK_NONE) {
  		fhci_config_transceiver(fhci, FHCI_PORT_FULL);
  		qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
  	} else {
  		fhci_config_transceiver(fhci, FHCI_PORT_LOW);
  		qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
  	}
  
  	/* Clear and disable any pending interrupts. */
  	out_be16(&fhci->regs->usb_usber, 0xffff);
  	out_be16(&fhci->regs->usb_usbmr, 0);
  
  	ret = usb_add_hcd(hcd, usb_irq, 0);
  	if (ret < 0)
  		goto err_add_hcd;
  
  	device_wakeup_enable(hcd->self.controller);
  
  	fhci_dfs_create(fhci);
  
  	return 0;
  
  err_add_hcd:
  err_clocks:
  	irq_dispose_mapping(usb_irq);
  err_usb_irq:
  	free_irq(fhci->timer->irq, hcd);
  err_timer_irq:
  	gtm_put_timer16(fhci->timer);
  err_get_timer:
  err_pins:
  	while (--j >= 0)
  		qe_pin_free(fhci->pins[j]);
  err_gpios:
  	while (--i >= 0) {
  		if (gpio_is_valid(fhci->gpios[i]))
  			gpio_free(fhci->gpios[i]);
  	}
  	cpm_muram_free(pram_addr);
  err_pram:
  	iounmap(hcd->regs);
  err_regs:
  	usb_put_hcd(hcd);
  	return ret;
  }
  
  static int fhci_remove(struct device *dev)
  {
  	struct usb_hcd *hcd = dev_get_drvdata(dev);
  	struct fhci_hcd *fhci = hcd_to_fhci(hcd);
  	int i;
  	int j;
  
  	usb_remove_hcd(hcd);
  	free_irq(fhci->timer->irq, hcd);
  	gtm_put_timer16(fhci->timer);
  	cpm_muram_free(cpm_muram_offset(fhci->pram));
  	for (i = 0; i < NUM_GPIOS; i++) {
  		if (!gpio_is_valid(fhci->gpios[i]))
  			continue;
  		gpio_free(fhci->gpios[i]);
  	}
  	for (j = 0; j < NUM_PINS; j++)
  		qe_pin_free(fhci->pins[j]);
  	fhci_dfs_destroy(fhci);
  	usb_put_hcd(hcd);
  	return 0;
  }
  
  static int of_fhci_remove(struct platform_device *ofdev)
  {
  	return fhci_remove(&ofdev->dev);
  }
  
  static const struct of_device_id of_fhci_match[] = {
  	{ .compatible = "fsl,mpc8323-qe-usb", },
  	{},
  };
  MODULE_DEVICE_TABLE(of, of_fhci_match);
  
  static struct platform_driver of_fhci_driver = {
  	.driver = {
  		.name = "fsl,usb-fhci",
  		.owner = THIS_MODULE,
  		.of_match_table = of_fhci_match,
  	},
  	.probe		= of_fhci_probe,
  	.remove		= of_fhci_remove,
  };
  
  module_platform_driver(of_fhci_driver);
  
  MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
  MODULE_AUTHOR("Shlomi Gridish <gridish@freescale.com>, "
  	      "Jerry Huang <Chang-Ming.Huang@freescale.com>, "
  	      "Anton Vorontsov <avorontsov@ru.mvista.com>");
  MODULE_LICENSE("GPL");