PM / sleep: Asynchronous threads for suspend_noirq

[linux/fpc-iii.git] / drivers / usb / dwc2 / hcd.c

/*
 * hcd.c - DesignWare HS OTG Controller host-mode routines
 *
 * Copyright (C) 2004-2013 Synopsys, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The names of the above-listed copyright holders may not be used
 *    to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * ALTERNATIVELY, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any
 * later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This file contains the core HCD code, and implements the Linux hc_driver
 * API
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/usb.h>

#include <linux/usb/hcd.h>
#include <linux/usb/ch11.h>

#include "core.h"
#include "hcd.h"

/**
 * dwc2_dump_channel_info() - Prints the state of a host channel
 *
 * @hsotg: Programming view of DWC_otg controller
 * @chan:  Pointer to the channel to dump
 *
 * Must be called with interrupt disabled and spinlock held
 *
 * NOTE: This function will be removed once the peripheral controller code
 * is integrated and the driver is stable
 */
static void dwc2_dump_channel_info(struct dwc2_hsotg *hsotg,
                                   struct dwc2_host_chan *chan)
{
#ifdef VERBOSE_DEBUG
        int num_channels = hsotg->core_params->host_channels;
        struct dwc2_qh *qh;
        u32 hcchar;
        u32 hcsplt;
        u32 hctsiz;
        u32 hc_dma;
        int i;

        if (chan == NULL)
                return;

        hcchar = readl(hsotg->regs + HCCHAR(chan->hc_num));
        hcsplt = readl(hsotg->regs + HCSPLT(chan->hc_num));
        hctsiz = readl(hsotg->regs + HCTSIZ(chan->hc_num));
        hc_dma = readl(hsotg->regs + HCDMA(chan->hc_num));

        dev_dbg(hsotg->dev, "  Assigned to channel %p:\n", chan);
        dev_dbg(hsotg->dev, "    hcchar 0x%08x, hcsplt 0x%08x\n",
                hcchar, hcsplt);
        dev_dbg(hsotg->dev, "    hctsiz 0x%08x, hc_dma 0x%08x\n",
                hctsiz, hc_dma);
        dev_dbg(hsotg->dev, "    dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
                chan->dev_addr, chan->ep_num, chan->ep_is_in);
        dev_dbg(hsotg->dev, "    ep_type: %d\n", chan->ep_type);
        dev_dbg(hsotg->dev, "    max_packet: %d\n", chan->max_packet);
        dev_dbg(hsotg->dev, "    data_pid_start: %d\n", chan->data_pid_start);
        dev_dbg(hsotg->dev, "    xfer_started: %d\n", chan->xfer_started);
        dev_dbg(hsotg->dev, "    halt_status: %d\n", chan->halt_status);
        dev_dbg(hsotg->dev, "    xfer_buf: %p\n", chan->xfer_buf);
        dev_dbg(hsotg->dev, "    xfer_dma: %08lx\n",
                (unsigned long)chan->xfer_dma);
        dev_dbg(hsotg->dev, "    xfer_len: %d\n", chan->xfer_len);
        dev_dbg(hsotg->dev, "    qh: %p\n", chan->qh);
        dev_dbg(hsotg->dev, "  NP inactive sched:\n");
        list_for_each_entry(qh, &hsotg->non_periodic_sched_inactive,
                            qh_list_entry)
                dev_dbg(hsotg->dev, "    %p\n", qh);
        dev_dbg(hsotg->dev, "  NP active sched:\n");
        list_for_each_entry(qh, &hsotg->non_periodic_sched_active,
                            qh_list_entry)
                dev_dbg(hsotg->dev, "    %p\n", qh);
        dev_dbg(hsotg->dev, "  Channels:\n");
        for (i = 0; i < num_channels; i++) {
                struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];

                dev_dbg(hsotg->dev, "    %2d: %p\n", i, chan);
        }
#endif /* VERBOSE_DEBUG */
}

/*
 * Processes all the URBs in a single list of QHs. Completes them with
 * -ETIMEDOUT and frees the QTD.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_kill_urbs_in_qh_list(struct dwc2_hsotg *hsotg,
                                      struct list_head *qh_list)
{
        struct dwc2_qh *qh, *qh_tmp;
        struct dwc2_qtd *qtd, *qtd_tmp;

        list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
                list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
                                         qtd_list_entry) {
                        dwc2_host_complete(hsotg, qtd, -ETIMEDOUT);
                        dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);
                }
        }
}

static void dwc2_qh_list_free(struct dwc2_hsotg *hsotg,
                              struct list_head *qh_list)
{
        struct dwc2_qtd *qtd, *qtd_tmp;
        struct dwc2_qh *qh, *qh_tmp;
        unsigned long flags;

        if (!qh_list->next)
                /* The list hasn't been initialized yet */
                return;

        spin_lock_irqsave(&hsotg->lock, flags);

        /* Ensure there are no QTDs or URBs left */
        dwc2_kill_urbs_in_qh_list(hsotg, qh_list);

        list_for_each_entry_safe(qh, qh_tmp, qh_list, qh_list_entry) {
                dwc2_hcd_qh_unlink(hsotg, qh);

                /* Free each QTD in the QH's QTD list */
                list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list,
                                         qtd_list_entry)
                        dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);

                spin_unlock_irqrestore(&hsotg->lock, flags);
                dwc2_hcd_qh_free(hsotg, qh);
                spin_lock_irqsave(&hsotg->lock, flags);
        }

        spin_unlock_irqrestore(&hsotg->lock, flags);
}

/*
 * Responds with an error status of -ETIMEDOUT to all URBs in the non-periodic
 * and periodic schedules. The QTD associated with each URB is removed from
 * the schedule and freed. This function may be called when a disconnect is
 * detected or when the HCD is being stopped.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_kill_all_urbs(struct dwc2_hsotg *hsotg)
{
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_inactive);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->non_periodic_sched_active);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_inactive);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_ready);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_assigned);
        dwc2_kill_urbs_in_qh_list(hsotg, &hsotg->periodic_sched_queued);
}

/**
 * dwc2_hcd_start() - Starts the HCD when switching to Host mode
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 */
void dwc2_hcd_start(struct dwc2_hsotg *hsotg)
{
        u32 hprt0;

        if (hsotg->op_state == OTG_STATE_B_HOST) {
                /*
                 * Reset the port. During a HNP mode switch the reset
                 * needs to occur within 1ms and have a duration of at
                 * least 50ms.
                 */
                hprt0 = dwc2_read_hprt0(hsotg);
                hprt0 |= HPRT0_RST;
                writel(hprt0, hsotg->regs + HPRT0);
        }

        queue_delayed_work(hsotg->wq_otg, &hsotg->start_work,
                           msecs_to_jiffies(50));
}

/* Must be called with interrupt disabled and spinlock held */
static void dwc2_hcd_cleanup_channels(struct dwc2_hsotg *hsotg)
{
        int num_channels = hsotg->core_params->host_channels;
        struct dwc2_host_chan *channel;
        u32 hcchar;
        int i;

        if (hsotg->core_params->dma_enable <= 0) {
                /* Flush out any channel requests in slave mode */
                for (i = 0; i < num_channels; i++) {
                        channel = hsotg->hc_ptr_array[i];
                        if (!list_empty(&channel->hc_list_entry))
                                continue;
                        hcchar = readl(hsotg->regs + HCCHAR(i));
                        if (hcchar & HCCHAR_CHENA) {
                                hcchar &= ~(HCCHAR_CHENA | HCCHAR_EPDIR);
                                hcchar |= HCCHAR_CHDIS;
                                writel(hcchar, hsotg->regs + HCCHAR(i));
                        }
                }
        }

        for (i = 0; i < num_channels; i++) {
                channel = hsotg->hc_ptr_array[i];
                if (!list_empty(&channel->hc_list_entry))
                        continue;
                hcchar = readl(hsotg->regs + HCCHAR(i));
                if (hcchar & HCCHAR_CHENA) {
                        /* Halt the channel */
                        hcchar |= HCCHAR_CHDIS;
                        writel(hcchar, hsotg->regs + HCCHAR(i));
                }

                dwc2_hc_cleanup(hsotg, channel);
                list_add_tail(&channel->hc_list_entry, &hsotg->free_hc_list);
                /*
                 * Added for Descriptor DMA to prevent channel double cleanup in
                 * release_channel_ddma(), which is called from ep_disable when
                 * device disconnects
                 */
                channel->qh = NULL;
        }
}

/**
 * dwc2_hcd_disconnect() - Handles disconnect of the HCD
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_hcd_disconnect(struct dwc2_hsotg *hsotg)
{
        u32 intr;

        /* Set status flags for the hub driver */
        hsotg->flags.b.port_connect_status_change = 1;
        hsotg->flags.b.port_connect_status = 0;

        /*
         * Shutdown any transfers in process by clearing the Tx FIFO Empty
         * interrupt mask and status bits and disabling subsequent host
         * channel interrupts.
         */
        intr = readl(hsotg->regs + GINTMSK);
        intr &= ~(GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT);
        writel(intr, hsotg->regs + GINTMSK);
        intr = GINTSTS_NPTXFEMP | GINTSTS_PTXFEMP | GINTSTS_HCHINT;
        writel(intr, hsotg->regs + GINTSTS);

        /*
         * Turn off the vbus power only if the core has transitioned to device
         * mode. If still in host mode, need to keep power on to detect a
         * reconnection.
         */
        if (dwc2_is_device_mode(hsotg)) {
                if (hsotg->op_state != OTG_STATE_A_SUSPEND) {
                        dev_dbg(hsotg->dev, "Disconnect: PortPower off\n");
                        writel(0, hsotg->regs + HPRT0);
                }

                dwc2_disable_host_interrupts(hsotg);
        }

        /* Respond with an error status to all URBs in the schedule */
        dwc2_kill_all_urbs(hsotg);

        if (dwc2_is_host_mode(hsotg))
                /* Clean up any host channels that were in use */
                dwc2_hcd_cleanup_channels(hsotg);

        dwc2_host_disconnect(hsotg);
}

/**
 * dwc2_hcd_rem_wakeup() - Handles Remote Wakeup
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 */
static void dwc2_hcd_rem_wakeup(struct dwc2_hsotg *hsotg)
{
        if (hsotg->lx_state == DWC2_L2)
                hsotg->flags.b.port_suspend_change = 1;
        else
                hsotg->flags.b.port_l1_change = 1;
}

/**
 * dwc2_hcd_stop() - Halts the DWC_otg host mode operations in a clean manner
 *
 * @hsotg: Pointer to struct dwc2_hsotg
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_hcd_stop(struct dwc2_hsotg *hsotg)
{
        dev_dbg(hsotg->dev, "DWC OTG HCD STOP\n");

        /*
         * The root hub should be disconnected before this function is called.
         * The disconnect will clear the QTD lists (via ..._hcd_urb_dequeue)
         * and the QH lists (via ..._hcd_endpoint_disable).
         */

        /* Turn off all host-specific interrupts */
        dwc2_disable_host_interrupts(hsotg);

        /* Turn off the vbus power */
        dev_dbg(hsotg->dev, "PortPower off\n");
        writel(0, hsotg->regs + HPRT0);
}

static int dwc2_hcd_urb_enqueue(struct dwc2_hsotg *hsotg,
                                struct dwc2_hcd_urb *urb, void **ep_handle,
                                gfp_t mem_flags)
{
        struct dwc2_qtd *qtd;
        unsigned long flags;
        u32 intr_mask;
        int retval;
        int dev_speed;

        if (!hsotg->flags.b.port_connect_status) {
                /* No longer connected */
                dev_err(hsotg->dev, "Not connected\n");
                return -ENODEV;
        }

        dev_speed = dwc2_host_get_speed(hsotg, urb->priv);

        /* Some configurations cannot support LS traffic on a FS root port */
        if ((dev_speed == USB_SPEED_LOW) &&
            (hsotg->hw_params.fs_phy_type == GHWCFG2_FS_PHY_TYPE_DEDICATED) &&
            (hsotg->hw_params.hs_phy_type == GHWCFG2_HS_PHY_TYPE_UTMI)) {
                u32 hprt0 = readl(hsotg->regs + HPRT0);
                u32 prtspd = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;

                if (prtspd == HPRT0_SPD_FULL_SPEED)
                        return -ENODEV;
        }

        qtd = kzalloc(sizeof(*qtd), mem_flags);
        if (!qtd)
                return -ENOMEM;

        dwc2_hcd_qtd_init(qtd, urb);
        retval = dwc2_hcd_qtd_add(hsotg, qtd, (struct dwc2_qh **)ep_handle,
                                  mem_flags);
        if (retval) {
                dev_err(hsotg->dev,
                        "DWC OTG HCD URB Enqueue failed adding QTD. Error status %d\n",
                        retval);
                kfree(qtd);
                return retval;
        }

        intr_mask = readl(hsotg->regs + GINTMSK);
        if (!(intr_mask & GINTSTS_SOF)) {
                enum dwc2_transaction_type tr_type;

                if (qtd->qh->ep_type == USB_ENDPOINT_XFER_BULK &&
                    !(qtd->urb->flags & URB_GIVEBACK_ASAP))
                        /*
                         * Do not schedule SG transactions until qtd has
                         * URB_GIVEBACK_ASAP set
                         */
                        return 0;

                spin_lock_irqsave(&hsotg->lock, flags);
                tr_type = dwc2_hcd_select_transactions(hsotg);
                if (tr_type != DWC2_TRANSACTION_NONE)
                        dwc2_hcd_queue_transactions(hsotg, tr_type);
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }

        return 0;
}

/* Must be called with interrupt disabled and spinlock held */
static int dwc2_hcd_urb_dequeue(struct dwc2_hsotg *hsotg,
                                struct dwc2_hcd_urb *urb)
{
        struct dwc2_qh *qh;
        struct dwc2_qtd *urb_qtd;

        urb_qtd = urb->qtd;
        if (!urb_qtd) {
                dev_dbg(hsotg->dev, "## Urb QTD is NULL ##\n");
                return -EINVAL;
        }

        qh = urb_qtd->qh;
        if (!qh) {
                dev_dbg(hsotg->dev, "## Urb QTD QH is NULL ##\n");
                return -EINVAL;
        }

        urb->priv = NULL;

        if (urb_qtd->in_process && qh->channel) {
                dwc2_dump_channel_info(hsotg, qh->channel);

                /* The QTD is in process (it has been assigned to a channel) */
                if (hsotg->flags.b.port_connect_status)
                        /*
                         * If still connected (i.e. in host mode), halt the
                         * channel so it can be used for other transfers. If
                         * no longer connected, the host registers can't be
                         * written to halt the channel since the core is in
                         * device mode.
                         */
                        dwc2_hc_halt(hsotg, qh->channel,
                                     DWC2_HC_XFER_URB_DEQUEUE);
        }

        /*
         * Free the QTD and clean up the associated QH. Leave the QH in the
         * schedule if it has any remaining QTDs.
         */
        if (hsotg->core_params->dma_desc_enable <= 0) {
                u8 in_process = urb_qtd->in_process;

                dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
                if (in_process) {
                        dwc2_hcd_qh_deactivate(hsotg, qh, 0);
                        qh->channel = NULL;
                } else if (list_empty(&qh->qtd_list)) {
                        dwc2_hcd_qh_unlink(hsotg, qh);
                }
        } else {
                dwc2_hcd_qtd_unlink_and_free(hsotg, urb_qtd, qh);
        }

        return 0;
}

/* Must NOT be called with interrupt disabled or spinlock held */
static int dwc2_hcd_endpoint_disable(struct dwc2_hsotg *hsotg,
                                     struct usb_host_endpoint *ep, int retry)
{
        struct dwc2_qtd *qtd, *qtd_tmp;
        struct dwc2_qh *qh;
        unsigned long flags;
        int rc;

        spin_lock_irqsave(&hsotg->lock, flags);

        qh = ep->hcpriv;
        if (!qh) {
                rc = -EINVAL;
                goto err;
        }

        while (!list_empty(&qh->qtd_list) && retry--) {
                if (retry == 0) {
                        dev_err(hsotg->dev,
                                "## timeout in dwc2_hcd_endpoint_disable() ##\n");
                        rc = -EBUSY;
                        goto err;
                }

                spin_unlock_irqrestore(&hsotg->lock, flags);
                usleep_range(20000, 40000);
                spin_lock_irqsave(&hsotg->lock, flags);
                qh = ep->hcpriv;
                if (!qh) {
                        rc = -EINVAL;
                        goto err;
                }
        }

        dwc2_hcd_qh_unlink(hsotg, qh);

        /* Free each QTD in the QH's QTD list */
        list_for_each_entry_safe(qtd, qtd_tmp, &qh->qtd_list, qtd_list_entry)
                dwc2_hcd_qtd_unlink_and_free(hsotg, qtd, qh);

        ep->hcpriv = NULL;
        spin_unlock_irqrestore(&hsotg->lock, flags);
        dwc2_hcd_qh_free(hsotg, qh);

        return 0;

err:
        ep->hcpriv = NULL;
        spin_unlock_irqrestore(&hsotg->lock, flags);

        return rc;
}

/* Must be called with interrupt disabled and spinlock held */
static int dwc2_hcd_endpoint_reset(struct dwc2_hsotg *hsotg,
                                   struct usb_host_endpoint *ep)
{
        struct dwc2_qh *qh = ep->hcpriv;

        if (!qh)
                return -EINVAL;

        qh->data_toggle = DWC2_HC_PID_DATA0;

        return 0;
}

/*
 * Initializes dynamic portions of the DWC_otg HCD state
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_hcd_reinit(struct dwc2_hsotg *hsotg)
{
        struct dwc2_host_chan *chan, *chan_tmp;
        int num_channels;
        int i;

        hsotg->flags.d32 = 0;
        hsotg->non_periodic_qh_ptr = &hsotg->non_periodic_sched_active;

        if (hsotg->core_params->uframe_sched > 0) {
                hsotg->available_host_channels =
                        hsotg->core_params->host_channels;
        } else {
                hsotg->non_periodic_channels = 0;
                hsotg->periodic_channels = 0;
        }

        /*
         * Put all channels in the free channel list and clean up channel
         * states
         */
        list_for_each_entry_safe(chan, chan_tmp, &hsotg->free_hc_list,
                                 hc_list_entry)
                list_del_init(&chan->hc_list_entry);

        num_channels = hsotg->core_params->host_channels;
        for (i = 0; i < num_channels; i++) {
                chan = hsotg->hc_ptr_array[i];
                list_add_tail(&chan->hc_list_entry, &hsotg->free_hc_list);
                dwc2_hc_cleanup(hsotg, chan);
        }

        /* Initialize the DWC core for host mode operation */
        dwc2_core_host_init(hsotg);
}

static void dwc2_hc_init_split(struct dwc2_hsotg *hsotg,
                               struct dwc2_host_chan *chan,
                               struct dwc2_qtd *qtd, struct dwc2_hcd_urb *urb)
{
        int hub_addr, hub_port;

        chan->do_split = 1;
        chan->xact_pos = qtd->isoc_split_pos;
        chan->complete_split = qtd->complete_split;
        dwc2_host_hub_info(hsotg, urb->priv, &hub_addr, &hub_port);
        chan->hub_addr = (u8)hub_addr;
        chan->hub_port = (u8)hub_port;
}

static void *dwc2_hc_init_xfer(struct dwc2_hsotg *hsotg,
                               struct dwc2_host_chan *chan,
                               struct dwc2_qtd *qtd, void *bufptr)
{
        struct dwc2_hcd_urb *urb = qtd->urb;
        struct dwc2_hcd_iso_packet_desc *frame_desc;

        switch (dwc2_hcd_get_pipe_type(&urb->pipe_info)) {
        case USB_ENDPOINT_XFER_CONTROL:
                chan->ep_type = USB_ENDPOINT_XFER_CONTROL;

                switch (qtd->control_phase) {
                case DWC2_CONTROL_SETUP:
                        dev_vdbg(hsotg->dev, "  Control setup transaction\n");
                        chan->do_ping = 0;
                        chan->ep_is_in = 0;
                        chan->data_pid_start = DWC2_HC_PID_SETUP;
                        if (hsotg->core_params->dma_enable > 0)
                                chan->xfer_dma = urb->setup_dma;
                        else
                                chan->xfer_buf = urb->setup_packet;
                        chan->xfer_len = 8;
                        bufptr = NULL;
                        break;

                case DWC2_CONTROL_DATA:
                        dev_vdbg(hsotg->dev, "  Control data transaction\n");
                        chan->data_pid_start = qtd->data_toggle;
                        break;

                case DWC2_CONTROL_STATUS:
                        /*
                         * Direction is opposite of data direction or IN if no
                         * data
                         */
                        dev_vdbg(hsotg->dev, "  Control status transaction\n");
                        if (urb->length == 0)
                                chan->ep_is_in = 1;
                        else
                                chan->ep_is_in =
                                        dwc2_hcd_is_pipe_out(&urb->pipe_info);
                        if (chan->ep_is_in)
                                chan->do_ping = 0;
                        chan->data_pid_start = DWC2_HC_PID_DATA1;
                        chan->xfer_len = 0;
                        if (hsotg->core_params->dma_enable > 0)
                                chan->xfer_dma = hsotg->status_buf_dma;
                        else
                                chan->xfer_buf = hsotg->status_buf;
                        bufptr = NULL;
                        break;
                }
                break;

        case USB_ENDPOINT_XFER_BULK:
                chan->ep_type = USB_ENDPOINT_XFER_BULK;
                break;

        case USB_ENDPOINT_XFER_INT:
                chan->ep_type = USB_ENDPOINT_XFER_INT;
                break;

        case USB_ENDPOINT_XFER_ISOC:
                chan->ep_type = USB_ENDPOINT_XFER_ISOC;
                if (hsotg->core_params->dma_desc_enable > 0)
                        break;

                frame_desc = &urb->iso_descs[qtd->isoc_frame_index];
                frame_desc->status = 0;

                if (hsotg->core_params->dma_enable > 0) {
                        chan->xfer_dma = urb->dma;
                        chan->xfer_dma += frame_desc->offset +
                                        qtd->isoc_split_offset;
                } else {
                        chan->xfer_buf = urb->buf;
                        chan->xfer_buf += frame_desc->offset +
                                        qtd->isoc_split_offset;
                }

                chan->xfer_len = frame_desc->length - qtd->isoc_split_offset;

                /* For non-dword aligned buffers */
                if (hsotg->core_params->dma_enable > 0 &&
                    (chan->xfer_dma & 0x3))
                        bufptr = (u8 *)urb->buf + frame_desc->offset +
                                        qtd->isoc_split_offset;
                else
                        bufptr = NULL;

                if (chan->xact_pos == DWC2_HCSPLT_XACTPOS_ALL) {
                        if (chan->xfer_len <= 188)
                                chan->xact_pos = DWC2_HCSPLT_XACTPOS_ALL;
                        else
                                chan->xact_pos = DWC2_HCSPLT_XACTPOS_BEGIN;
                }
                break;
        }

        return bufptr;
}

static int dwc2_hc_setup_align_buf(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh,
                                   struct dwc2_host_chan *chan, void *bufptr)
{
        u32 buf_size;

        if (chan->ep_type != USB_ENDPOINT_XFER_ISOC)
                buf_size = hsotg->core_params->max_transfer_size;
        else
                buf_size = 4096;

        if (!qh->dw_align_buf) {
                qh->dw_align_buf = dma_alloc_coherent(hsotg->dev, buf_size,
                                                      &qh->dw_align_buf_dma,
                                                      GFP_ATOMIC);
                if (!qh->dw_align_buf)
                        return -ENOMEM;
        }

        if (!chan->ep_is_in && chan->xfer_len) {
                dma_sync_single_for_cpu(hsotg->dev, chan->xfer_dma, buf_size,
                                        DMA_TO_DEVICE);
                memcpy(qh->dw_align_buf, bufptr, chan->xfer_len);
                dma_sync_single_for_device(hsotg->dev, chan->xfer_dma, buf_size,
                                           DMA_TO_DEVICE);
        }

        chan->align_buf = qh->dw_align_buf_dma;
        return 0;
}

/**
 * dwc2_assign_and_init_hc() - Assigns transactions from a QTD to a free host
 * channel and initializes the host channel to perform the transactions. The
 * host channel is removed from the free list.
 *
 * @hsotg: The HCD state structure
 * @qh:    Transactions from the first QTD for this QH are selected and assigned
 *         to a free host channel
 */
static int dwc2_assign_and_init_hc(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
{
        struct dwc2_host_chan *chan;
        struct dwc2_hcd_urb *urb;
        struct dwc2_qtd *qtd;
        void *bufptr = NULL;

        if (dbg_qh(qh))
                dev_vdbg(hsotg->dev, "%s(%p,%p)\n", __func__, hsotg, qh);

        if (list_empty(&qh->qtd_list)) {
                dev_dbg(hsotg->dev, "No QTDs in QH list\n");
                return -ENOMEM;
        }

        if (list_empty(&hsotg->free_hc_list)) {
                dev_dbg(hsotg->dev, "No free channel to assign\n");
                return -ENOMEM;
        }

        chan = list_first_entry(&hsotg->free_hc_list, struct dwc2_host_chan,
                                hc_list_entry);

        /* Remove host channel from free list */
        list_del_init(&chan->hc_list_entry);

        qtd = list_first_entry(&qh->qtd_list, struct dwc2_qtd, qtd_list_entry);
        urb = qtd->urb;
        qh->channel = chan;
        qtd->in_process = 1;

        /*
         * Use usb_pipedevice to determine device address. This address is
         * 0 before the SET_ADDRESS command and the correct address afterward.
         */
        chan->dev_addr = dwc2_hcd_get_dev_addr(&urb->pipe_info);
        chan->ep_num = dwc2_hcd_get_ep_num(&urb->pipe_info);
        chan->speed = qh->dev_speed;
        chan->max_packet = dwc2_max_packet(qh->maxp);

        chan->xfer_started = 0;
        chan->halt_status = DWC2_HC_XFER_NO_HALT_STATUS;
        chan->error_state = (qtd->error_count > 0);
        chan->halt_on_queue = 0;
        chan->halt_pending = 0;
        chan->requests = 0;

        /*
         * The following values may be modified in the transfer type section
         * below. The xfer_len value may be reduced when the transfer is
         * started to accommodate the max widths of the XferSize and PktCnt
         * fields in the HCTSIZn register.
         */

        chan->ep_is_in = (dwc2_hcd_is_pipe_in(&urb->pipe_info) != 0);
        if (chan->ep_is_in)
                chan->do_ping = 0;
        else
                chan->do_ping = qh->ping_state;

        chan->data_pid_start = qh->data_toggle;
        chan->multi_count = 1;

        if (urb->actual_length > urb->length &&
                !dwc2_hcd_is_pipe_in(&urb->pipe_info))
                urb->actual_length = urb->length;

        if (hsotg->core_params->dma_enable > 0) {
                chan->xfer_dma = urb->dma + urb->actual_length;

                /* For non-dword aligned case */
                if (hsotg->core_params->dma_desc_enable <= 0 &&
                    (chan->xfer_dma & 0x3))
                        bufptr = (u8 *)urb->buf + urb->actual_length;
        } else {
                chan->xfer_buf = (u8 *)urb->buf + urb->actual_length;
        }

        chan->xfer_len = urb->length - urb->actual_length;
        chan->xfer_count = 0;

        /* Set the split attributes if required */
        if (qh->do_split)
                dwc2_hc_init_split(hsotg, chan, qtd, urb);
        else
                chan->do_split = 0;

        /* Set the transfer attributes */
        bufptr = dwc2_hc_init_xfer(hsotg, chan, qtd, bufptr);

        /* Non DWORD-aligned buffer case */
        if (bufptr) {
                dev_vdbg(hsotg->dev, "Non-aligned buffer\n");
                if (dwc2_hc_setup_align_buf(hsotg, qh, chan, bufptr)) {
                        dev_err(hsotg->dev,
                                "%s: Failed to allocate memory to handle non-dword aligned buffer\n",
                                __func__);
                        /* Add channel back to free list */
                        chan->align_buf = 0;
                        chan->multi_count = 0;
                        list_add_tail(&chan->hc_list_entry,
                                      &hsotg->free_hc_list);
                        qtd->in_process = 0;
                        qh->channel = NULL;
                        return -ENOMEM;
                }
        } else {
                chan->align_buf = 0;
        }

        if (chan->ep_type == USB_ENDPOINT_XFER_INT ||
            chan->ep_type == USB_ENDPOINT_XFER_ISOC)
                /*
                 * This value may be modified when the transfer is started
                 * to reflect the actual transfer length
                 */
                chan->multi_count = dwc2_hb_mult(qh->maxp);

        if (hsotg->core_params->dma_desc_enable > 0)
                chan->desc_list_addr = qh->desc_list_dma;

        dwc2_hc_init(hsotg, chan);
        chan->qh = qh;

        return 0;
}

/**
 * dwc2_hcd_select_transactions() - Selects transactions from the HCD transfer
 * schedule and assigns them to available host channels. Called from the HCD
 * interrupt handler functions.
 *
 * @hsotg: The HCD state structure
 *
 * Return: The types of new transactions that were assigned to host channels
 */
enum dwc2_transaction_type dwc2_hcd_select_transactions(
                struct dwc2_hsotg *hsotg)
{
        enum dwc2_transaction_type ret_val = DWC2_TRANSACTION_NONE;
        struct list_head *qh_ptr;
        struct dwc2_qh *qh;
        int num_channels;

#ifdef DWC2_DEBUG_SOF
        dev_vdbg(hsotg->dev, "  Select Transactions\n");
#endif

        /* Process entries in the periodic ready list */
        qh_ptr = hsotg->periodic_sched_ready.next;
        while (qh_ptr != &hsotg->periodic_sched_ready) {
                if (list_empty(&hsotg->free_hc_list))
                        break;
                if (hsotg->core_params->uframe_sched > 0) {
                        if (hsotg->available_host_channels <= 1)
                                break;
                        hsotg->available_host_channels--;
                }
                qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
                if (dwc2_assign_and_init_hc(hsotg, qh))
                        break;

                /*
                 * Move the QH from the periodic ready schedule to the
                 * periodic assigned schedule
                 */
                qh_ptr = qh_ptr->next;
                list_move(&qh->qh_list_entry, &hsotg->periodic_sched_assigned);
                ret_val = DWC2_TRANSACTION_PERIODIC;
        }

        /*
         * Process entries in the inactive portion of the non-periodic
         * schedule. Some free host channels may not be used if they are
         * reserved for periodic transfers.
         */
        num_channels = hsotg->core_params->host_channels;
        qh_ptr = hsotg->non_periodic_sched_inactive.next;
        while (qh_ptr != &hsotg->non_periodic_sched_inactive) {
                if (hsotg->core_params->uframe_sched <= 0 &&
                    hsotg->non_periodic_channels >= num_channels -
                                                hsotg->periodic_channels)
                        break;
                if (list_empty(&hsotg->free_hc_list))
                        break;
                qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
                if (hsotg->core_params->uframe_sched > 0) {
                        if (hsotg->available_host_channels < 1)
                                break;
                        hsotg->available_host_channels--;
                }

                if (dwc2_assign_and_init_hc(hsotg, qh))
                        break;

                /*
                 * Move the QH from the non-periodic inactive schedule to the
                 * non-periodic active schedule
                 */
                qh_ptr = qh_ptr->next;
                list_move(&qh->qh_list_entry,
                          &hsotg->non_periodic_sched_active);

                if (ret_val == DWC2_TRANSACTION_NONE)
                        ret_val = DWC2_TRANSACTION_NON_PERIODIC;
                else
                        ret_val = DWC2_TRANSACTION_ALL;

                if (hsotg->core_params->uframe_sched <= 0)
                        hsotg->non_periodic_channels++;
        }

        return ret_val;
}

/**
 * dwc2_queue_transaction() - Attempts to queue a single transaction request for
 * a host channel associated with either a periodic or non-periodic transfer
 *
 * @hsotg: The HCD state structure
 * @chan:  Host channel descriptor associated with either a periodic or
 *         non-periodic transfer
 * @fifo_dwords_avail: Number of DWORDs available in the periodic Tx FIFO
 *                     for periodic transfers or the non-periodic Tx FIFO
 *                     for non-periodic transfers
 *
 * Return: 1 if a request is queued and more requests may be needed to
 * complete the transfer, 0 if no more requests are required for this
 * transfer, -1 if there is insufficient space in the Tx FIFO
 *
 * This function assumes that there is space available in the appropriate
 * request queue. For an OUT transfer or SETUP transaction in Slave mode,
 * it checks whether space is available in the appropriate Tx FIFO.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static int dwc2_queue_transaction(struct dwc2_hsotg *hsotg,
                                  struct dwc2_host_chan *chan,
                                  u16 fifo_dwords_avail)
{
        int retval = 0;

        if (hsotg->core_params->dma_enable > 0) {
                if (hsotg->core_params->dma_desc_enable > 0) {
                        if (!chan->xfer_started ||
                            chan->ep_type == USB_ENDPOINT_XFER_ISOC) {
                                dwc2_hcd_start_xfer_ddma(hsotg, chan->qh);
                                chan->qh->ping_state = 0;
                        }
                } else if (!chan->xfer_started) {
                        dwc2_hc_start_transfer(hsotg, chan);
                        chan->qh->ping_state = 0;
                }
        } else if (chan->halt_pending) {
                /* Don't queue a request if the channel has been halted */
        } else if (chan->halt_on_queue) {
                dwc2_hc_halt(hsotg, chan, chan->halt_status);
        } else if (chan->do_ping) {
                if (!chan->xfer_started)
                        dwc2_hc_start_transfer(hsotg, chan);
        } else if (!chan->ep_is_in ||
                   chan->data_pid_start == DWC2_HC_PID_SETUP) {
                if ((fifo_dwords_avail * 4) >= chan->max_packet) {
                        if (!chan->xfer_started) {
                                dwc2_hc_start_transfer(hsotg, chan);
                                retval = 1;
                        } else {
                                retval = dwc2_hc_continue_transfer(hsotg, chan);
                        }
                } else {
                        retval = -1;
                }
        } else {
                if (!chan->xfer_started) {
                        dwc2_hc_start_transfer(hsotg, chan);
                        retval = 1;
                } else {
                        retval = dwc2_hc_continue_transfer(hsotg, chan);
                }
        }

        return retval;
}

/*
 * Processes periodic channels for the next frame and queues transactions for
 * these channels to the DWC_otg controller. After queueing transactions, the
 * Periodic Tx FIFO Empty interrupt is enabled if there are more transactions
 * to queue as Periodic Tx FIFO or request queue space becomes available.
 * Otherwise, the Periodic Tx FIFO Empty interrupt is disabled.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_process_periodic_channels(struct dwc2_hsotg *hsotg)
{
        struct list_head *qh_ptr;
        struct dwc2_qh *qh;
        u32 tx_status;
        u32 fspcavail;
        u32 gintmsk;
        int status;
        int no_queue_space = 0;
        int no_fifo_space = 0;
        u32 qspcavail;

        if (dbg_perio())
                dev_vdbg(hsotg->dev, "Queue periodic transactions\n");

        tx_status = readl(hsotg->regs + HPTXSTS);
        qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                    TXSTS_QSPCAVAIL_SHIFT;
        fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                    TXSTS_FSPCAVAIL_SHIFT;

        if (dbg_perio()) {
                dev_vdbg(hsotg->dev, "  P Tx Req Queue Space Avail (before queue): %d\n",
                         qspcavail);
                dev_vdbg(hsotg->dev, "  P Tx FIFO Space Avail (before queue): %d\n",
                         fspcavail);
        }

        qh_ptr = hsotg->periodic_sched_assigned.next;
        while (qh_ptr != &hsotg->periodic_sched_assigned) {
                tx_status = readl(hsotg->regs + HPTXSTS);
                qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                            TXSTS_QSPCAVAIL_SHIFT;
                if (qspcavail == 0) {
                        no_queue_space = 1;
                        break;
                }

                qh = list_entry(qh_ptr, struct dwc2_qh, qh_list_entry);
                if (!qh->channel) {
                        qh_ptr = qh_ptr->next;
                        continue;
                }

                /* Make sure EP's TT buffer is clean before queueing qtds */
                if (qh->tt_buffer_dirty) {
                        qh_ptr = qh_ptr->next;
                        continue;
                }

                /*
                 * Set a flag if we're queuing high-bandwidth in slave mode.
                 * The flag prevents any halts to get into the request queue in
                 * the middle of multiple high-bandwidth packets getting queued.
                 */
                if (hsotg->core_params->dma_enable <= 0 &&
                                qh->channel->multi_count > 1)
                        hsotg->queuing_high_bandwidth = 1;

                fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                            TXSTS_FSPCAVAIL_SHIFT;
                status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);
                if (status < 0) {
                        no_fifo_space = 1;
                        break;
                }

                /*
                 * In Slave mode, stay on the current transfer until there is
                 * nothing more to do or the high-bandwidth request count is
                 * reached. In DMA mode, only need to queue one request. The
                 * controller automatically handles multiple packets for
                 * high-bandwidth transfers.
                 */
                if (hsotg->core_params->dma_enable > 0 || status == 0 ||
                    qh->channel->requests == qh->channel->multi_count) {
                        qh_ptr = qh_ptr->next;
                        /*
                         * Move the QH from the periodic assigned schedule to
                         * the periodic queued schedule
                         */
                        list_move(&qh->qh_list_entry,
                                  &hsotg->periodic_sched_queued);

                        /* done queuing high bandwidth */
                        hsotg->queuing_high_bandwidth = 0;
                }
        }

        if (hsotg->core_params->dma_enable <= 0) {
                tx_status = readl(hsotg->regs + HPTXSTS);
                qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                            TXSTS_QSPCAVAIL_SHIFT;
                fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                            TXSTS_FSPCAVAIL_SHIFT;
                if (dbg_perio()) {
                        dev_vdbg(hsotg->dev,
                                 "  P Tx Req Queue Space Avail (after queue): %d\n",
                                 qspcavail);
                        dev_vdbg(hsotg->dev,
                                 "  P Tx FIFO Space Avail (after queue): %d\n",
                                 fspcavail);
                }

                if (!list_empty(&hsotg->periodic_sched_assigned) ||
                    no_queue_space || no_fifo_space) {
                        /*
                         * May need to queue more transactions as the request
                         * queue or Tx FIFO empties. Enable the periodic Tx
                         * FIFO empty interrupt. (Always use the half-empty
                         * level to ensure that new requests are loaded as
                         * soon as possible.)
                         */
                        gintmsk = readl(hsotg->regs + GINTMSK);
                        gintmsk |= GINTSTS_PTXFEMP;
                        writel(gintmsk, hsotg->regs + GINTMSK);
                } else {
                        /*
                         * Disable the Tx FIFO empty interrupt since there are
                         * no more transactions that need to be queued right
                         * now. This function is called from interrupt
                         * handlers to queue more transactions as transfer
                         * states change.
                         */
                        gintmsk = readl(hsotg->regs + GINTMSK);
                        gintmsk &= ~GINTSTS_PTXFEMP;
                        writel(gintmsk, hsotg->regs + GINTMSK);
                }
        }
}

/*
 * Processes active non-periodic channels and queues transactions for these
 * channels to the DWC_otg controller. After queueing transactions, the NP Tx
 * FIFO Empty interrupt is enabled if there are more transactions to queue as
 * NP Tx FIFO or request queue space becomes available. Otherwise, the NP Tx
 * FIFO Empty interrupt is disabled.
 *
 * Must be called with interrupt disabled and spinlock held
 */
static void dwc2_process_non_periodic_channels(struct dwc2_hsotg *hsotg)
{
        struct list_head *orig_qh_ptr;
        struct dwc2_qh *qh;
        u32 tx_status;
        u32 qspcavail;
        u32 fspcavail;
        u32 gintmsk;
        int status;
        int no_queue_space = 0;
        int no_fifo_space = 0;
        int more_to_do = 0;

        dev_vdbg(hsotg->dev, "Queue non-periodic transactions\n");

        tx_status = readl(hsotg->regs + GNPTXSTS);
        qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                    TXSTS_QSPCAVAIL_SHIFT;
        fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                    TXSTS_FSPCAVAIL_SHIFT;
        dev_vdbg(hsotg->dev, "  NP Tx Req Queue Space Avail (before queue): %d\n",
                 qspcavail);
        dev_vdbg(hsotg->dev, "  NP Tx FIFO Space Avail (before queue): %d\n",
                 fspcavail);

        /*
         * Keep track of the starting point. Skip over the start-of-list
         * entry.
         */
        if (hsotg->non_periodic_qh_ptr == &hsotg->non_periodic_sched_active)
                hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
        orig_qh_ptr = hsotg->non_periodic_qh_ptr;

        /*
         * Process once through the active list or until no more space is
         * available in the request queue or the Tx FIFO
         */
        do {
                tx_status = readl(hsotg->regs + GNPTXSTS);
                qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                            TXSTS_QSPCAVAIL_SHIFT;
                if (hsotg->core_params->dma_enable <= 0 && qspcavail == 0) {
                        no_queue_space = 1;
                        break;
                }

                qh = list_entry(hsotg->non_periodic_qh_ptr, struct dwc2_qh,
                                qh_list_entry);
                if (!qh->channel)
                        goto next;

                /* Make sure EP's TT buffer is clean before queueing qtds */
                if (qh->tt_buffer_dirty)
                        goto next;

                fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                            TXSTS_FSPCAVAIL_SHIFT;
                status = dwc2_queue_transaction(hsotg, qh->channel, fspcavail);

                if (status > 0) {
                        more_to_do = 1;
                } else if (status < 0) {
                        no_fifo_space = 1;
                        break;
                }
next:
                /* Advance to next QH, skipping start-of-list entry */
                hsotg->non_periodic_qh_ptr = hsotg->non_periodic_qh_ptr->next;
                if (hsotg->non_periodic_qh_ptr ==
                                &hsotg->non_periodic_sched_active)
                        hsotg->non_periodic_qh_ptr =
                                        hsotg->non_periodic_qh_ptr->next;
        } while (hsotg->non_periodic_qh_ptr != orig_qh_ptr);

        if (hsotg->core_params->dma_enable <= 0) {
                tx_status = readl(hsotg->regs + GNPTXSTS);
                qspcavail = (tx_status & TXSTS_QSPCAVAIL_MASK) >>
                            TXSTS_QSPCAVAIL_SHIFT;
                fspcavail = (tx_status & TXSTS_FSPCAVAIL_MASK) >>
                            TXSTS_FSPCAVAIL_SHIFT;
                dev_vdbg(hsotg->dev,
                         "  NP Tx Req Queue Space Avail (after queue): %d\n",
                         qspcavail);
                dev_vdbg(hsotg->dev,
                         "  NP Tx FIFO Space Avail (after queue): %d\n",
                         fspcavail);

                if (more_to_do || no_queue_space || no_fifo_space) {
                        /*
                         * May need to queue more transactions as the request
                         * queue or Tx FIFO empties. Enable the non-periodic
                         * Tx FIFO empty interrupt. (Always use the half-empty
                         * level to ensure that new requests are loaded as
                         * soon as possible.)
                         */
                        gintmsk = readl(hsotg->regs + GINTMSK);
                        gintmsk |= GINTSTS_NPTXFEMP;
                        writel(gintmsk, hsotg->regs + GINTMSK);
                } else {
                        /*
                         * Disable the Tx FIFO empty interrupt since there are
                         * no more transactions that need to be queued right
                         * now. This function is called from interrupt
                         * handlers to queue more transactions as transfer
                         * states change.
                         */
                        gintmsk = readl(hsotg->regs + GINTMSK);
                        gintmsk &= ~GINTSTS_NPTXFEMP;
                        writel(gintmsk, hsotg->regs + GINTMSK);
                }
        }
}

/**
 * dwc2_hcd_queue_transactions() - Processes the currently active host channels
 * and queues transactions for these channels to the DWC_otg controller. Called
 * from the HCD interrupt handler functions.
 *
 * @hsotg:   The HCD state structure
 * @tr_type: The type(s) of transactions to queue (non-periodic, periodic,
 *           or both)
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_hcd_queue_transactions(struct dwc2_hsotg *hsotg,
                                 enum dwc2_transaction_type tr_type)
{
#ifdef DWC2_DEBUG_SOF
        dev_vdbg(hsotg->dev, "Queue Transactions\n");
#endif
        /* Process host channels associated with periodic transfers */
        if ((tr_type == DWC2_TRANSACTION_PERIODIC ||
             tr_type == DWC2_TRANSACTION_ALL) &&
            !list_empty(&hsotg->periodic_sched_assigned))
                dwc2_process_periodic_channels(hsotg);

        /* Process host channels associated with non-periodic transfers */
        if (tr_type == DWC2_TRANSACTION_NON_PERIODIC ||
            tr_type == DWC2_TRANSACTION_ALL) {
                if (!list_empty(&hsotg->non_periodic_sched_active)) {
                        dwc2_process_non_periodic_channels(hsotg);
                } else {
                        /*
                         * Ensure NP Tx FIFO empty interrupt is disabled when
                         * there are no non-periodic transfers to process
                         */
                        u32 gintmsk = readl(hsotg->regs + GINTMSK);

                        gintmsk &= ~GINTSTS_NPTXFEMP;
                        writel(gintmsk, hsotg->regs + GINTMSK);
                }
        }
}

static void dwc2_conn_id_status_change(struct work_struct *work)
{
        struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
                                                wf_otg);
        u32 count = 0;
        u32 gotgctl;

        dev_dbg(hsotg->dev, "%s()\n", __func__);

        gotgctl = readl(hsotg->regs + GOTGCTL);
        dev_dbg(hsotg->dev, "gotgctl=%0x\n", gotgctl);
        dev_dbg(hsotg->dev, "gotgctl.b.conidsts=%d\n",
                !!(gotgctl & GOTGCTL_CONID_B));

        /* B-Device connector (Device Mode) */
        if (gotgctl & GOTGCTL_CONID_B) {
                /* Wait for switch to device mode */
                dev_dbg(hsotg->dev, "connId B\n");
                while (!dwc2_is_device_mode(hsotg)) {
                        dev_info(hsotg->dev,
                                 "Waiting for Peripheral Mode, Mode=%s\n",
                                 dwc2_is_host_mode(hsotg) ? "Host" :
                                 "Peripheral");
                        usleep_range(20000, 40000);
                        if (++count > 250)
                                break;
                }
                if (count > 250)
                        dev_err(hsotg->dev,
                                "Connection id status change timed out\n");
                hsotg->op_state = OTG_STATE_B_PERIPHERAL;
                dwc2_core_init(hsotg, false, -1);
                dwc2_enable_global_interrupts(hsotg);
        } else {
                /* A-Device connector (Host Mode) */
                dev_dbg(hsotg->dev, "connId A\n");
                while (!dwc2_is_host_mode(hsotg)) {
                        dev_info(hsotg->dev, "Waiting for Host Mode, Mode=%s\n",
                                 dwc2_is_host_mode(hsotg) ?
                                 "Host" : "Peripheral");
                        usleep_range(20000, 40000);
                        if (++count > 250)
                                break;
                }
                if (count > 250)
                        dev_err(hsotg->dev,
                                "Connection id status change timed out\n");
                hsotg->op_state = OTG_STATE_A_HOST;

                /* Initialize the Core for Host mode */
                dwc2_core_init(hsotg, false, -1);
                dwc2_enable_global_interrupts(hsotg);
                dwc2_hcd_start(hsotg);
        }
}

static void dwc2_wakeup_detected(unsigned long data)
{
        struct dwc2_hsotg *hsotg = (struct dwc2_hsotg *)data;
        u32 hprt0;

        dev_dbg(hsotg->dev, "%s()\n", __func__);

        /*
         * Clear the Resume after 70ms. (Need 20 ms minimum. Use 70 ms
         * so that OPT tests pass with all PHYs.)
         */
        hprt0 = dwc2_read_hprt0(hsotg);
        dev_dbg(hsotg->dev, "Resume: HPRT0=%0x\n", hprt0);
        hprt0 &= ~HPRT0_RES;
        writel(hprt0, hsotg->regs + HPRT0);
        dev_dbg(hsotg->dev, "Clear Resume: HPRT0=%0x\n",
                readl(hsotg->regs + HPRT0));

        dwc2_hcd_rem_wakeup(hsotg);

        /* Change to L0 state */
        hsotg->lx_state = DWC2_L0;
}

static int dwc2_host_is_b_hnp_enabled(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);

        return hcd->self.b_hnp_enable;
}

/* Must NOT be called with interrupt disabled or spinlock held */
static void dwc2_port_suspend(struct dwc2_hsotg *hsotg, u16 windex)
{
        unsigned long flags;
        u32 hprt0;
        u32 pcgctl;
        u32 gotgctl;

        dev_dbg(hsotg->dev, "%s()\n", __func__);

        spin_lock_irqsave(&hsotg->lock, flags);

        if (windex == hsotg->otg_port && dwc2_host_is_b_hnp_enabled(hsotg)) {
                gotgctl = readl(hsotg->regs + GOTGCTL);
                gotgctl |= GOTGCTL_HSTSETHNPEN;
                writel(gotgctl, hsotg->regs + GOTGCTL);
                hsotg->op_state = OTG_STATE_A_SUSPEND;
        }

        hprt0 = dwc2_read_hprt0(hsotg);
        hprt0 |= HPRT0_SUSP;
        writel(hprt0, hsotg->regs + HPRT0);

        /* Update lx_state */
        hsotg->lx_state = DWC2_L2;

        /* Suspend the Phy Clock */
        pcgctl = readl(hsotg->regs + PCGCTL);
        pcgctl |= PCGCTL_STOPPCLK;
        writel(pcgctl, hsotg->regs + PCGCTL);
        udelay(10);

        /* For HNP the bus must be suspended for at least 200ms */
        if (dwc2_host_is_b_hnp_enabled(hsotg)) {
                pcgctl = readl(hsotg->regs + PCGCTL);
                pcgctl &= ~PCGCTL_STOPPCLK;
                writel(pcgctl, hsotg->regs + PCGCTL);

                spin_unlock_irqrestore(&hsotg->lock, flags);

                usleep_range(200000, 250000);
        } else {
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }
}

/* Handles hub class-specific requests */
static int dwc2_hcd_hub_control(struct dwc2_hsotg *hsotg, u16 typereq,
                                u16 wvalue, u16 windex, char *buf, u16 wlength)
{
        struct usb_hub_descriptor *hub_desc;
        int retval = 0;
        u32 hprt0;
        u32 port_status;
        u32 speed;
        u32 pcgctl;

        switch (typereq) {
        case ClearHubFeature:
                dev_dbg(hsotg->dev, "ClearHubFeature %1xh\n", wvalue);

                switch (wvalue) {
                case C_HUB_LOCAL_POWER:
                case C_HUB_OVER_CURRENT:
                        /* Nothing required here */
                        break;

                default:
                        retval = -EINVAL;
                        dev_err(hsotg->dev,
                                "ClearHubFeature request %1xh unknown\n",
                                wvalue);
                }
                break;

        case ClearPortFeature:
                if (wvalue != USB_PORT_FEAT_L1)
                        if (!windex || windex > 1)
                                goto error;
                switch (wvalue) {
                case USB_PORT_FEAT_ENABLE:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_ENABLE\n");
                        hprt0 = dwc2_read_hprt0(hsotg);
                        hprt0 |= HPRT0_ENA;
                        writel(hprt0, hsotg->regs + HPRT0);
                        break;

                case USB_PORT_FEAT_SUSPEND:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_SUSPEND\n");
                        writel(0, hsotg->regs + PCGCTL);
                        usleep_range(20000, 40000);

                        hprt0 = dwc2_read_hprt0(hsotg);
                        hprt0 |= HPRT0_RES;
                        writel(hprt0, hsotg->regs + HPRT0);
                        hprt0 &= ~HPRT0_SUSP;
                        usleep_range(100000, 150000);

                        hprt0 &= ~HPRT0_RES;
                        writel(hprt0, hsotg->regs + HPRT0);
                        break;

                case USB_PORT_FEAT_POWER:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_POWER\n");
                        hprt0 = dwc2_read_hprt0(hsotg);
                        hprt0 &= ~HPRT0_PWR;
                        writel(hprt0, hsotg->regs + HPRT0);
                        break;

                case USB_PORT_FEAT_INDICATOR:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_INDICATOR\n");
                        /* Port indicator not supported */
                        break;

                case USB_PORT_FEAT_C_CONNECTION:
                        /*
                         * Clears driver's internal Connect Status Change flag
                         */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_CONNECTION\n");
                        hsotg->flags.b.port_connect_status_change = 0;
                        break;

                case USB_PORT_FEAT_C_RESET:
                        /* Clears driver's internal Port Reset Change flag */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_RESET\n");
                        hsotg->flags.b.port_reset_change = 0;
                        break;

                case USB_PORT_FEAT_C_ENABLE:
                        /*
                         * Clears the driver's internal Port Enable/Disable
                         * Change flag
                         */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_ENABLE\n");
                        hsotg->flags.b.port_enable_change = 0;
                        break;

                case USB_PORT_FEAT_C_SUSPEND:
                        /*
                         * Clears the driver's internal Port Suspend Change
                         * flag, which is set when resume signaling on the host
                         * port is complete
                         */
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_SUSPEND\n");
                        hsotg->flags.b.port_suspend_change = 0;
                        break;

                case USB_PORT_FEAT_C_PORT_L1:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_PORT_L1\n");
                        hsotg->flags.b.port_l1_change = 0;
                        break;

                case USB_PORT_FEAT_C_OVER_CURRENT:
                        dev_dbg(hsotg->dev,
                                "ClearPortFeature USB_PORT_FEAT_C_OVER_CURRENT\n");
                        hsotg->flags.b.port_over_current_change = 0;
                        break;

                default:
                        retval = -EINVAL;
                        dev_err(hsotg->dev,
                                "ClearPortFeature request %1xh unknown or unsupported\n",
                                wvalue);
                }
                break;

        case GetHubDescriptor:
                dev_dbg(hsotg->dev, "GetHubDescriptor\n");
                hub_desc = (struct usb_hub_descriptor *)buf;
                hub_desc->bDescLength = 9;
                hub_desc->bDescriptorType = 0x29;
                hub_desc->bNbrPorts = 1;
                hub_desc->wHubCharacteristics = cpu_to_le16(0x08);
                hub_desc->bPwrOn2PwrGood = 1;
                hub_desc->bHubContrCurrent = 0;
                hub_desc->u.hs.DeviceRemovable[0] = 0;
                hub_desc->u.hs.DeviceRemovable[1] = 0xff;
                break;

        case GetHubStatus:
                dev_dbg(hsotg->dev, "GetHubStatus\n");
                memset(buf, 0, 4);
                break;

        case GetPortStatus:
                dev_vdbg(hsotg->dev,
                         "GetPortStatus wIndex=0x%04x flags=0x%08x\n", windex,
                         hsotg->flags.d32);
                if (!windex || windex > 1)
                        goto error;

                port_status = 0;
                if (hsotg->flags.b.port_connect_status_change)
                        port_status |= USB_PORT_STAT_C_CONNECTION << 16;
                if (hsotg->flags.b.port_enable_change)
                        port_status |= USB_PORT_STAT_C_ENABLE << 16;
                if (hsotg->flags.b.port_suspend_change)
                        port_status |= USB_PORT_STAT_C_SUSPEND << 16;
                if (hsotg->flags.b.port_l1_change)
                        port_status |= USB_PORT_STAT_C_L1 << 16;
                if (hsotg->flags.b.port_reset_change)
                        port_status |= USB_PORT_STAT_C_RESET << 16;
                if (hsotg->flags.b.port_over_current_change) {
                        dev_warn(hsotg->dev, "Overcurrent change detected\n");
                        port_status |= USB_PORT_STAT_C_OVERCURRENT << 16;
                }

                if (!hsotg->flags.b.port_connect_status) {
                        /*
                         * The port is disconnected, which means the core is
                         * either in device mode or it soon will be. Just
                         * return 0's for the remainder of the port status
                         * since the port register can't be read if the core
                         * is in device mode.
                         */
                        *(__le32 *)buf = cpu_to_le32(port_status);
                        break;
                }

                hprt0 = readl(hsotg->regs + HPRT0);
                dev_vdbg(hsotg->dev, "  HPRT0: 0x%08x\n", hprt0);

                if (hprt0 & HPRT0_CONNSTS)
                        port_status |= USB_PORT_STAT_CONNECTION;
                if (hprt0 & HPRT0_ENA)
                        port_status |= USB_PORT_STAT_ENABLE;
                if (hprt0 & HPRT0_SUSP)
                        port_status |= USB_PORT_STAT_SUSPEND;
                if (hprt0 & HPRT0_OVRCURRACT)
                        port_status |= USB_PORT_STAT_OVERCURRENT;
                if (hprt0 & HPRT0_RST)
                        port_status |= USB_PORT_STAT_RESET;
                if (hprt0 & HPRT0_PWR)
                        port_status |= USB_PORT_STAT_POWER;

                speed = (hprt0 & HPRT0_SPD_MASK) >> HPRT0_SPD_SHIFT;
                if (speed == HPRT0_SPD_HIGH_SPEED)
                        port_status |= USB_PORT_STAT_HIGH_SPEED;
                else if (speed == HPRT0_SPD_LOW_SPEED)
                        port_status |= USB_PORT_STAT_LOW_SPEED;

                if (hprt0 & HPRT0_TSTCTL_MASK)
                        port_status |= USB_PORT_STAT_TEST;
                /* USB_PORT_FEAT_INDICATOR unsupported always 0 */

                dev_vdbg(hsotg->dev, "port_status=%08x\n", port_status);
                *(__le32 *)buf = cpu_to_le32(port_status);
                break;

        case SetHubFeature:
                dev_dbg(hsotg->dev, "SetHubFeature\n");
                /* No HUB features supported */
                break;

        case SetPortFeature:
                dev_dbg(hsotg->dev, "SetPortFeature\n");
                if (wvalue != USB_PORT_FEAT_TEST && (!windex || windex > 1))
                        goto error;

                if (!hsotg->flags.b.port_connect_status) {
                        /*
                         * The port is disconnected, which means the core is
                         * either in device mode or it soon will be. Just
                         * return without doing anything since the port
                         * register can't be written if the core is in device
                         * mode.
                         */
                        break;
                }

                switch (wvalue) {
                case USB_PORT_FEAT_SUSPEND:
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_SUSPEND\n");
                        if (windex != hsotg->otg_port)
                                goto error;
                        dwc2_port_suspend(hsotg, windex);
                        break;

                case USB_PORT_FEAT_POWER:
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_POWER\n");
                        hprt0 = dwc2_read_hprt0(hsotg);
                        hprt0 |= HPRT0_PWR;
                        writel(hprt0, hsotg->regs + HPRT0);
                        break;

                case USB_PORT_FEAT_RESET:
                        hprt0 = dwc2_read_hprt0(hsotg);
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_RESET\n");
                        pcgctl = readl(hsotg->regs + PCGCTL);
                        pcgctl &= ~(PCGCTL_ENBL_SLEEP_GATING | PCGCTL_STOPPCLK);
                        writel(pcgctl, hsotg->regs + PCGCTL);
                        /* ??? Original driver does this */
                        writel(0, hsotg->regs + PCGCTL);

                        hprt0 = dwc2_read_hprt0(hsotg);
                        /* Clear suspend bit if resetting from suspend state */
                        hprt0 &= ~HPRT0_SUSP;

                        /*
                         * When B-Host the Port reset bit is set in the Start
                         * HCD Callback function, so that the reset is started
                         * within 1ms of the HNP success interrupt
                         */
                        if (!dwc2_hcd_is_b_host(hsotg)) {
                                hprt0 |= HPRT0_PWR | HPRT0_RST;
                                dev_dbg(hsotg->dev,
                                        "In host mode, hprt0=%08x\n", hprt0);
                                writel(hprt0, hsotg->regs + HPRT0);
                        }

                        /* Clear reset bit in 10ms (FS/LS) or 50ms (HS) */
                        usleep_range(50000, 70000);
                        hprt0 &= ~HPRT0_RST;
                        writel(hprt0, hsotg->regs + HPRT0);
                        hsotg->lx_state = DWC2_L0; /* Now back to On state */
                        break;

                case USB_PORT_FEAT_INDICATOR:
                        dev_dbg(hsotg->dev,
                                "SetPortFeature - USB_PORT_FEAT_INDICATOR\n");
                        /* Not supported */
                        break;

                default:
                        retval = -EINVAL;
                        dev_err(hsotg->dev,
                                "SetPortFeature %1xh unknown or unsupported\n",
                                wvalue);
                        break;
                }
                break;

        default:
error:
                retval = -EINVAL;
                dev_dbg(hsotg->dev,
                        "Unknown hub control request: %1xh wIndex: %1xh wValue: %1xh\n",
                        typereq, windex, wvalue);
                break;
        }

        return retval;
}

static int dwc2_hcd_is_status_changed(struct dwc2_hsotg *hsotg, int port)
{
        int retval;

        if (port != 1)
                return -EINVAL;

        retval = (hsotg->flags.b.port_connect_status_change ||
                  hsotg->flags.b.port_reset_change ||
                  hsotg->flags.b.port_enable_change ||
                  hsotg->flags.b.port_suspend_change ||
                  hsotg->flags.b.port_over_current_change);

        if (retval) {
                dev_dbg(hsotg->dev,
                        "DWC OTG HCD HUB STATUS DATA: Root port status changed\n");
                dev_dbg(hsotg->dev, "  port_connect_status_change: %d\n",
                        hsotg->flags.b.port_connect_status_change);
                dev_dbg(hsotg->dev, "  port_reset_change: %d\n",
                        hsotg->flags.b.port_reset_change);
                dev_dbg(hsotg->dev, "  port_enable_change: %d\n",
                        hsotg->flags.b.port_enable_change);
                dev_dbg(hsotg->dev, "  port_suspend_change: %d\n",
                        hsotg->flags.b.port_suspend_change);
                dev_dbg(hsotg->dev, "  port_over_current_change: %d\n",
                        hsotg->flags.b.port_over_current_change);
        }

        return retval;
}

int dwc2_hcd_get_frame_number(struct dwc2_hsotg *hsotg)
{
        u32 hfnum = readl(hsotg->regs + HFNUM);

#ifdef DWC2_DEBUG_SOF
        dev_vdbg(hsotg->dev, "DWC OTG HCD GET FRAME NUMBER %d\n",
                 (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT);
#endif
        return (hfnum & HFNUM_FRNUM_MASK) >> HFNUM_FRNUM_SHIFT;
}

int dwc2_hcd_is_b_host(struct dwc2_hsotg *hsotg)
{
        return hsotg->op_state == OTG_STATE_B_HOST;
}

static struct dwc2_hcd_urb *dwc2_hcd_urb_alloc(struct dwc2_hsotg *hsotg,
                                               int iso_desc_count,
                                               gfp_t mem_flags)
{
        struct dwc2_hcd_urb *urb;
        u32 size = sizeof(*urb) + iso_desc_count *
                   sizeof(struct dwc2_hcd_iso_packet_desc);

        urb = kzalloc(size, mem_flags);
        if (urb)
                urb->packet_count = iso_desc_count;
        return urb;
}

static void dwc2_hcd_urb_set_pipeinfo(struct dwc2_hsotg *hsotg,
                                      struct dwc2_hcd_urb *urb, u8 dev_addr,
                                      u8 ep_num, u8 ep_type, u8 ep_dir, u16 mps)
{
        if (dbg_perio() ||
            ep_type == USB_ENDPOINT_XFER_BULK ||
            ep_type == USB_ENDPOINT_XFER_CONTROL)
                dev_vdbg(hsotg->dev,
                         "addr=%d, ep_num=%d, ep_dir=%1x, ep_type=%1x, mps=%d\n",
                         dev_addr, ep_num, ep_dir, ep_type, mps);
        urb->pipe_info.dev_addr = dev_addr;
        urb->pipe_info.ep_num = ep_num;
        urb->pipe_info.pipe_type = ep_type;
        urb->pipe_info.pipe_dir = ep_dir;
        urb->pipe_info.mps = mps;
}

/*
 * NOTE: This function will be removed once the peripheral controller code
 * is integrated and the driver is stable
 */
void dwc2_hcd_dump_state(struct dwc2_hsotg *hsotg)
{
#ifdef DEBUG
        struct dwc2_host_chan *chan;
        struct dwc2_hcd_urb *urb;
        struct dwc2_qtd *qtd;
        int num_channels;
        u32 np_tx_status;
        u32 p_tx_status;
        int i;

        num_channels = hsotg->core_params->host_channels;
        dev_dbg(hsotg->dev, "\n");
        dev_dbg(hsotg->dev,
                "************************************************************\n");
        dev_dbg(hsotg->dev, "HCD State:\n");
        dev_dbg(hsotg->dev, "  Num channels: %d\n", num_channels);

        for (i = 0; i < num_channels; i++) {
                chan = hsotg->hc_ptr_array[i];
                dev_dbg(hsotg->dev, "  Channel %d:\n", i);
                dev_dbg(hsotg->dev,
                        "    dev_addr: %d, ep_num: %d, ep_is_in: %d\n",
                        chan->dev_addr, chan->ep_num, chan->ep_is_in);
                dev_dbg(hsotg->dev, "    speed: %d\n", chan->speed);
                dev_dbg(hsotg->dev, "    ep_type: %d\n", chan->ep_type);
                dev_dbg(hsotg->dev, "    max_packet: %d\n", chan->max_packet);
                dev_dbg(hsotg->dev, "    data_pid_start: %d\n",
                        chan->data_pid_start);
                dev_dbg(hsotg->dev, "    multi_count: %d\n", chan->multi_count);
                dev_dbg(hsotg->dev, "    xfer_started: %d\n",
                        chan->xfer_started);
                dev_dbg(hsotg->dev, "    xfer_buf: %p\n", chan->xfer_buf);
                dev_dbg(hsotg->dev, "    xfer_dma: %08lx\n",
                        (unsigned long)chan->xfer_dma);
                dev_dbg(hsotg->dev, "    xfer_len: %d\n", chan->xfer_len);
                dev_dbg(hsotg->dev, "    xfer_count: %d\n", chan->xfer_count);
                dev_dbg(hsotg->dev, "    halt_on_queue: %d\n",
                        chan->halt_on_queue);
                dev_dbg(hsotg->dev, "    halt_pending: %d\n",
                        chan->halt_pending);
                dev_dbg(hsotg->dev, "    halt_status: %d\n", chan->halt_status);
                dev_dbg(hsotg->dev, "    do_split: %d\n", chan->do_split);
                dev_dbg(hsotg->dev, "    complete_split: %d\n",
                        chan->complete_split);
                dev_dbg(hsotg->dev, "    hub_addr: %d\n", chan->hub_addr);
                dev_dbg(hsotg->dev, "    hub_port: %d\n", chan->hub_port);
                dev_dbg(hsotg->dev, "    xact_pos: %d\n", chan->xact_pos);
                dev_dbg(hsotg->dev, "    requests: %d\n", chan->requests);
                dev_dbg(hsotg->dev, "    qh: %p\n", chan->qh);

                if (chan->xfer_started) {
                        u32 hfnum, hcchar, hctsiz, hcint, hcintmsk;

                        hfnum = readl(hsotg->regs + HFNUM);
                        hcchar = readl(hsotg->regs + HCCHAR(i));
                        hctsiz = readl(hsotg->regs + HCTSIZ(i));
                        hcint = readl(hsotg->regs + HCINT(i));
                        hcintmsk = readl(hsotg->regs + HCINTMSK(i));
                        dev_dbg(hsotg->dev, "    hfnum: 0x%08x\n", hfnum);
                        dev_dbg(hsotg->dev, "    hcchar: 0x%08x\n", hcchar);
                        dev_dbg(hsotg->dev, "    hctsiz: 0x%08x\n", hctsiz);
                        dev_dbg(hsotg->dev, "    hcint: 0x%08x\n", hcint);
                        dev_dbg(hsotg->dev, "    hcintmsk: 0x%08x\n", hcintmsk);
                }

                if (!(chan->xfer_started && chan->qh))
                        continue;

                list_for_each_entry(qtd, &chan->qh->qtd_list, qtd_list_entry) {
                        if (!qtd->in_process)
                                break;
                        urb = qtd->urb;
                        dev_dbg(hsotg->dev, "    URB Info:\n");
                        dev_dbg(hsotg->dev, "      qtd: %p, urb: %p\n",
                                qtd, urb);
                        if (urb) {
                                dev_dbg(hsotg->dev,
                                        "      Dev: %d, EP: %d %s\n",
                                        dwc2_hcd_get_dev_addr(&urb->pipe_info),
                                        dwc2_hcd_get_ep_num(&urb->pipe_info),
                                        dwc2_hcd_is_pipe_in(&urb->pipe_info) ?
                                        "IN" : "OUT");
                                dev_dbg(hsotg->dev,
                                        "      Max packet size: %d\n",
                                        dwc2_hcd_get_mps(&urb->pipe_info));
                                dev_dbg(hsotg->dev,
                                        "      transfer_buffer: %p\n",
                                        urb->buf);
                                dev_dbg(hsotg->dev,
                                        "      transfer_dma: %08lx\n",
                                        (unsigned long)urb->dma);
                                dev_dbg(hsotg->dev,
                                        "      transfer_buffer_length: %d\n",
                                        urb->length);
                                dev_dbg(hsotg->dev, "      actual_length: %d\n",
                                        urb->actual_length);
                        }
                }
        }

        dev_dbg(hsotg->dev, "  non_periodic_channels: %d\n",
                hsotg->non_periodic_channels);
        dev_dbg(hsotg->dev, "  periodic_channels: %d\n",
                hsotg->periodic_channels);
        dev_dbg(hsotg->dev, "  periodic_usecs: %d\n", hsotg->periodic_usecs);
        np_tx_status = readl(hsotg->regs + GNPTXSTS);
        dev_dbg(hsotg->dev, "  NP Tx Req Queue Space Avail: %d\n",
                (np_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
        dev_dbg(hsotg->dev, "  NP Tx FIFO Space Avail: %d\n",
                (np_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
        p_tx_status = readl(hsotg->regs + HPTXSTS);
        dev_dbg(hsotg->dev, "  P Tx Req Queue Space Avail: %d\n",
                (p_tx_status & TXSTS_QSPCAVAIL_MASK) >> TXSTS_QSPCAVAIL_SHIFT);
        dev_dbg(hsotg->dev, "  P Tx FIFO Space Avail: %d\n",
                (p_tx_status & TXSTS_FSPCAVAIL_MASK) >> TXSTS_FSPCAVAIL_SHIFT);
        dwc2_hcd_dump_frrem(hsotg);
        dwc2_dump_global_registers(hsotg);
        dwc2_dump_host_registers(hsotg);
        dev_dbg(hsotg->dev,
                "************************************************************\n");
        dev_dbg(hsotg->dev, "\n");
#endif
}

/*
 * NOTE: This function will be removed once the peripheral controller code
 * is integrated and the driver is stable
 */
void dwc2_hcd_dump_frrem(struct dwc2_hsotg *hsotg)
{
#ifdef DWC2_DUMP_FRREM
        dev_dbg(hsotg->dev, "Frame remaining at SOF:\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->frrem_samples, hsotg->frrem_accum,
                hsotg->frrem_samples > 0 ?
                hsotg->frrem_accum / hsotg->frrem_samples : 0);
        dev_dbg(hsotg->dev, "\n");
        dev_dbg(hsotg->dev, "Frame remaining at start_transfer (uframe 7):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_7_samples,
                hsotg->hfnum_7_frrem_accum,
                hsotg->hfnum_7_samples > 0 ?
                hsotg->hfnum_7_frrem_accum / hsotg->hfnum_7_samples : 0);
        dev_dbg(hsotg->dev, "Frame remaining at start_transfer (uframe 0):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_0_samples,
                hsotg->hfnum_0_frrem_accum,
                hsotg->hfnum_0_samples > 0 ?
                hsotg->hfnum_0_frrem_accum / hsotg->hfnum_0_samples : 0);
        dev_dbg(hsotg->dev, "Frame remaining at start_transfer (uframe 1-6):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_other_samples,
                hsotg->hfnum_other_frrem_accum,
                hsotg->hfnum_other_samples > 0 ?
                hsotg->hfnum_other_frrem_accum / hsotg->hfnum_other_samples :
                0);
        dev_dbg(hsotg->dev, "\n");
        dev_dbg(hsotg->dev, "Frame remaining at sample point A (uframe 7):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_7_samples_a, hsotg->hfnum_7_frrem_accum_a,
                hsotg->hfnum_7_samples_a > 0 ?
                hsotg->hfnum_7_frrem_accum_a / hsotg->hfnum_7_samples_a : 0);
        dev_dbg(hsotg->dev, "Frame remaining at sample point A (uframe 0):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_0_samples_a, hsotg->hfnum_0_frrem_accum_a,
                hsotg->hfnum_0_samples_a > 0 ?
                hsotg->hfnum_0_frrem_accum_a / hsotg->hfnum_0_samples_a : 0);
        dev_dbg(hsotg->dev, "Frame remaining at sample point A (uframe 1-6):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_other_samples_a, hsotg->hfnum_other_frrem_accum_a,
                hsotg->hfnum_other_samples_a > 0 ?
                hsotg->hfnum_other_frrem_accum_a / hsotg->hfnum_other_samples_a
                : 0);
        dev_dbg(hsotg->dev, "\n");
        dev_dbg(hsotg->dev, "Frame remaining at sample point B (uframe 7):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_7_samples_b, hsotg->hfnum_7_frrem_accum_b,
                hsotg->hfnum_7_samples_b > 0 ?
                hsotg->hfnum_7_frrem_accum_b / hsotg->hfnum_7_samples_b : 0);
        dev_dbg(hsotg->dev, "Frame remaining at sample point B (uframe 0):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_0_samples_b, hsotg->hfnum_0_frrem_accum_b,
                (hsotg->hfnum_0_samples_b > 0) ?
                hsotg->hfnum_0_frrem_accum_b / hsotg->hfnum_0_samples_b : 0);
        dev_dbg(hsotg->dev, "Frame remaining at sample point B (uframe 1-6):\n");
        dev_dbg(hsotg->dev, "  samples %u, accum %llu, avg %llu\n",
                hsotg->hfnum_other_samples_b, hsotg->hfnum_other_frrem_accum_b,
                (hsotg->hfnum_other_samples_b > 0) ?
                hsotg->hfnum_other_frrem_accum_b / hsotg->hfnum_other_samples_b
                : 0);
#endif
}

struct wrapper_priv_data {
        struct dwc2_hsotg *hsotg;
};

/* Gets the dwc2_hsotg from a usb_hcd */
static struct dwc2_hsotg *dwc2_hcd_to_hsotg(struct usb_hcd *hcd)
{
        struct wrapper_priv_data *p;

        p = (struct wrapper_priv_data *) &hcd->hcd_priv;
        return p->hsotg;
}

static int _dwc2_hcd_start(struct usb_hcd *hcd);

void dwc2_host_start(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);

        hcd->self.is_b_host = dwc2_hcd_is_b_host(hsotg);
        _dwc2_hcd_start(hcd);
}

void dwc2_host_disconnect(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd = dwc2_hsotg_to_hcd(hsotg);

        hcd->self.is_b_host = 0;
}

void dwc2_host_hub_info(struct dwc2_hsotg *hsotg, void *context, int *hub_addr,
                        int *hub_port)
{
        struct urb *urb = context;

        if (urb->dev->tt)
                *hub_addr = urb->dev->tt->hub->devnum;
        else
                *hub_addr = 0;
        *hub_port = urb->dev->ttport;
}

int dwc2_host_get_speed(struct dwc2_hsotg *hsotg, void *context)
{
        struct urb *urb = context;

        return urb->dev->speed;
}

static void dwc2_allocate_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
                                        struct urb *urb)
{
        struct usb_bus *bus = hcd_to_bus(hcd);

        if (urb->interval)
                bus->bandwidth_allocated += bw / urb->interval;
        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
                bus->bandwidth_isoc_reqs++;
        else
                bus->bandwidth_int_reqs++;
}

static void dwc2_free_bus_bandwidth(struct usb_hcd *hcd, u16 bw,
                                    struct urb *urb)
{
        struct usb_bus *bus = hcd_to_bus(hcd);

        if (urb->interval)
                bus->bandwidth_allocated -= bw / urb->interval;
        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS)
                bus->bandwidth_isoc_reqs--;
        else
                bus->bandwidth_int_reqs--;
}

/*
 * Sets the final status of an URB and returns it to the upper layer. Any
 * required cleanup of the URB is performed.
 *
 * Must be called with interrupt disabled and spinlock held
 */
void dwc2_host_complete(struct dwc2_hsotg *hsotg, struct dwc2_qtd *qtd,
                        int status)
{
        struct urb *urb;
        int i;

        if (!qtd) {
                dev_dbg(hsotg->dev, "## %s: qtd is NULL ##\n", __func__);
                return;
        }

        if (!qtd->urb) {
                dev_dbg(hsotg->dev, "## %s: qtd->urb is NULL ##\n", __func__);
                return;
        }

        urb = qtd->urb->priv;
        if (!urb) {
                dev_dbg(hsotg->dev, "## %s: urb->priv is NULL ##\n", __func__);
                return;
        }

        urb->actual_length = dwc2_hcd_urb_get_actual_length(qtd->urb);

        if (dbg_urb(urb))
                dev_vdbg(hsotg->dev,
                         "%s: urb %p device %d ep %d-%s status %d actual %d\n",
                         __func__, urb, usb_pipedevice(urb->pipe),
                         usb_pipeendpoint(urb->pipe),
                         usb_pipein(urb->pipe) ? "IN" : "OUT", status,
                         urb->actual_length);

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS && dbg_perio()) {
                for (i = 0; i < urb->number_of_packets; i++)
                        dev_vdbg(hsotg->dev, " ISO Desc %d status %d\n",
                                 i, urb->iso_frame_desc[i].status);
        }

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
                urb->error_count = dwc2_hcd_urb_get_error_count(qtd->urb);
                for (i = 0; i < urb->number_of_packets; ++i) {
                        urb->iso_frame_desc[i].actual_length =
                                dwc2_hcd_urb_get_iso_desc_actual_length(
                                                qtd->urb, i);
                        urb->iso_frame_desc[i].status =
                                dwc2_hcd_urb_get_iso_desc_status(qtd->urb, i);
                }
        }

        urb->status = status;
        if (!status) {
                if ((urb->transfer_flags & URB_SHORT_NOT_OK) &&
                    urb->actual_length < urb->transfer_buffer_length)
                        urb->status = -EREMOTEIO;
        }

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
            usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
                struct usb_host_endpoint *ep = urb->ep;

                if (ep)
                        dwc2_free_bus_bandwidth(dwc2_hsotg_to_hcd(hsotg),
                                        dwc2_hcd_get_ep_bandwidth(hsotg, ep),
                                        urb);
        }

        usb_hcd_unlink_urb_from_ep(dwc2_hsotg_to_hcd(hsotg), urb);
        urb->hcpriv = NULL;
        kfree(qtd->urb);
        qtd->urb = NULL;

        spin_unlock(&hsotg->lock);
        usb_hcd_giveback_urb(dwc2_hsotg_to_hcd(hsotg), urb, status);
        spin_lock(&hsotg->lock);
}

/*
 * Work queue function for starting the HCD when A-Cable is connected
 */
static void dwc2_hcd_start_func(struct work_struct *work)
{
        struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
                                                start_work.work);

        dev_dbg(hsotg->dev, "%s() %p\n", __func__, hsotg);
        dwc2_host_start(hsotg);
}

/*
 * Reset work queue function
 */
static void dwc2_hcd_reset_func(struct work_struct *work)
{
        struct dwc2_hsotg *hsotg = container_of(work, struct dwc2_hsotg,
                                                reset_work.work);
        u32 hprt0;

        dev_dbg(hsotg->dev, "USB RESET function called\n");
        hprt0 = dwc2_read_hprt0(hsotg);
        hprt0 &= ~HPRT0_RST;
        writel(hprt0, hsotg->regs + HPRT0);
        hsotg->flags.b.port_reset_change = 1;
}

/*
 * =========================================================================
 *  Linux HC Driver Functions
 * =========================================================================
 */

/*
 * Initializes the DWC_otg controller and its root hub and prepares it for host
 * mode operation. Activates the root port. Returns 0 on success and a negative
 * error code on failure.
 */
static int _dwc2_hcd_start(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        struct usb_bus *bus = hcd_to_bus(hcd);
        unsigned long flags;

        dev_dbg(hsotg->dev, "DWC OTG HCD START\n");

        spin_lock_irqsave(&hsotg->lock, flags);

        hcd->state = HC_STATE_RUNNING;

        if (dwc2_is_device_mode(hsotg)) {
                spin_unlock_irqrestore(&hsotg->lock, flags);
                return 0;       /* why 0 ?? */
        }

        dwc2_hcd_reinit(hsotg);

        /* Initialize and connect root hub if one is not already attached */
        if (bus->root_hub) {
                dev_dbg(hsotg->dev, "DWC OTG HCD Has Root Hub\n");
                /* Inform the HUB driver to resume */
                usb_hcd_resume_root_hub(hcd);
        }

        spin_unlock_irqrestore(&hsotg->lock, flags);
        return 0;
}

/*
 * Halts the DWC_otg host mode operations in a clean manner. USB transfers are
 * stopped.
 */
static void _dwc2_hcd_stop(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        unsigned long flags;

        spin_lock_irqsave(&hsotg->lock, flags);
        dwc2_hcd_stop(hsotg);
        spin_unlock_irqrestore(&hsotg->lock, flags);

        usleep_range(1000, 3000);
}

/* Returns the current frame number */
static int _dwc2_hcd_get_frame_number(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        return dwc2_hcd_get_frame_number(hsotg);
}

static void dwc2_dump_urb_info(struct usb_hcd *hcd, struct urb *urb,
                               char *fn_name)
{
#ifdef VERBOSE_DEBUG
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        char *pipetype;
        char *speed;

        dev_vdbg(hsotg->dev, "%s, urb %p\n", fn_name, urb);
        dev_vdbg(hsotg->dev, "  Device address: %d\n",
                 usb_pipedevice(urb->pipe));
        dev_vdbg(hsotg->dev, "  Endpoint: %d, %s\n",
                 usb_pipeendpoint(urb->pipe),
                 usb_pipein(urb->pipe) ? "IN" : "OUT");

        switch (usb_pipetype(urb->pipe)) {
        case PIPE_CONTROL:
                pipetype = "CONTROL";
                break;
        case PIPE_BULK:
                pipetype = "BULK";
                break;
        case PIPE_INTERRUPT:
                pipetype = "INTERRUPT";
                break;
        case PIPE_ISOCHRONOUS:
                pipetype = "ISOCHRONOUS";
                break;
        default:
                pipetype = "UNKNOWN";
                break;
        }

        dev_vdbg(hsotg->dev, "  Endpoint type: %s %s (%s)\n", pipetype,
                 usb_urb_dir_in(urb) ? "IN" : "OUT", usb_pipein(urb->pipe) ?
                 "IN" : "OUT");

        switch (urb->dev->speed) {
        case USB_SPEED_HIGH:
                speed = "HIGH";
                break;
        case USB_SPEED_FULL:
                speed = "FULL";
                break;
        case USB_SPEED_LOW:
                speed = "LOW";
                break;
        default:
                speed = "UNKNOWN";
                break;
        }

        dev_vdbg(hsotg->dev, "  Speed: %s\n", speed);
        dev_vdbg(hsotg->dev, "  Max packet size: %d\n",
                 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)));
        dev_vdbg(hsotg->dev, "  Data buffer length: %d\n",
                 urb->transfer_buffer_length);
        dev_vdbg(hsotg->dev, "  Transfer buffer: %p, Transfer DMA: %08lx\n",
                 urb->transfer_buffer, (unsigned long)urb->transfer_dma);
        dev_vdbg(hsotg->dev, "  Setup buffer: %p, Setup DMA: %08lx\n",
                 urb->setup_packet, (unsigned long)urb->setup_dma);
        dev_vdbg(hsotg->dev, "  Interval: %d\n", urb->interval);

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
                int i;

                for (i = 0; i < urb->number_of_packets; i++) {
                        dev_vdbg(hsotg->dev, "  ISO Desc %d:\n", i);
                        dev_vdbg(hsotg->dev, "    offset: %d, length %d\n",
                                 urb->iso_frame_desc[i].offset,
                                 urb->iso_frame_desc[i].length);
                }
        }
#endif
}

/*
 * Starts processing a USB transfer request specified by a USB Request Block
 * (URB). mem_flags indicates the type of memory allocation to use while
 * processing this URB.
 */
static int _dwc2_hcd_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
                                 gfp_t mem_flags)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        struct usb_host_endpoint *ep = urb->ep;
        struct dwc2_hcd_urb *dwc2_urb;
        int i;
        int retval;
        int alloc_bandwidth = 0;
        u8 ep_type = 0;
        u32 tflags = 0;
        void *buf;
        unsigned long flags;

        if (dbg_urb(urb)) {
                dev_vdbg(hsotg->dev, "DWC OTG HCD URB Enqueue\n");
                dwc2_dump_urb_info(hcd, urb, "urb_enqueue");
        }

        if (ep == NULL)
                return -EINVAL;

        if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS ||
            usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
                spin_lock_irqsave(&hsotg->lock, flags);
                if (!dwc2_hcd_is_bandwidth_allocated(hsotg, ep))
                        alloc_bandwidth = 1;
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }

        switch (usb_pipetype(urb->pipe)) {
        case PIPE_CONTROL:
                ep_type = USB_ENDPOINT_XFER_CONTROL;
                break;
        case PIPE_ISOCHRONOUS:
                ep_type = USB_ENDPOINT_XFER_ISOC;
                break;
        case PIPE_BULK:
                ep_type = USB_ENDPOINT_XFER_BULK;
                break;
        case PIPE_INTERRUPT:
                ep_type = USB_ENDPOINT_XFER_INT;
                break;
        default:
                dev_warn(hsotg->dev, "Wrong ep type\n");
        }

        dwc2_urb = dwc2_hcd_urb_alloc(hsotg, urb->number_of_packets,
                                      mem_flags);
        if (!dwc2_urb)
                return -ENOMEM;

        dwc2_hcd_urb_set_pipeinfo(hsotg, dwc2_urb, usb_pipedevice(urb->pipe),
                                  usb_pipeendpoint(urb->pipe), ep_type,
                                  usb_pipein(urb->pipe),
                                  usb_maxpacket(urb->dev, urb->pipe,
                                                !(usb_pipein(urb->pipe))));

        buf = urb->transfer_buffer;

        if (hcd->self.uses_dma) {
                if (!buf && (urb->transfer_dma & 3)) {
                        dev_err(hsotg->dev,
                                "%s: unaligned transfer with no transfer_buffer",
                                __func__);
                        retval = -EINVAL;
                        goto fail1;
                }
        }

        if (!(urb->transfer_flags & URB_NO_INTERRUPT))
                tflags |= URB_GIVEBACK_ASAP;
        if (urb->transfer_flags & URB_ZERO_PACKET)
                tflags |= URB_SEND_ZERO_PACKET;

        dwc2_urb->priv = urb;
        dwc2_urb->buf = buf;
        dwc2_urb->dma = urb->transfer_dma;
        dwc2_urb->length = urb->transfer_buffer_length;
        dwc2_urb->setup_packet = urb->setup_packet;
        dwc2_urb->setup_dma = urb->setup_dma;
        dwc2_urb->flags = tflags;
        dwc2_urb->interval = urb->interval;
        dwc2_urb->status = -EINPROGRESS;

        for (i = 0; i < urb->number_of_packets; ++i)
                dwc2_hcd_urb_set_iso_desc_params(dwc2_urb, i,
                                                 urb->iso_frame_desc[i].offset,
                                                 urb->iso_frame_desc[i].length);

        urb->hcpriv = dwc2_urb;

        spin_lock_irqsave(&hsotg->lock, flags);
        retval = usb_hcd_link_urb_to_ep(hcd, urb);
        spin_unlock_irqrestore(&hsotg->lock, flags);
        if (retval)
                goto fail1;

        retval = dwc2_hcd_urb_enqueue(hsotg, dwc2_urb, &ep->hcpriv, mem_flags);
        if (retval)
                goto fail2;

        if (alloc_bandwidth) {
                spin_lock_irqsave(&hsotg->lock, flags);
                dwc2_allocate_bus_bandwidth(hcd,
                                dwc2_hcd_get_ep_bandwidth(hsotg, ep),
                                urb);
                spin_unlock_irqrestore(&hsotg->lock, flags);
        }

        return 0;

fail2:
        spin_lock_irqsave(&hsotg->lock, flags);
        dwc2_urb->priv = NULL;
        usb_hcd_unlink_urb_from_ep(hcd, urb);
        spin_unlock_irqrestore(&hsotg->lock, flags);
fail1:
        urb->hcpriv = NULL;
        kfree(dwc2_urb);

        return retval;
}

/*
 * Aborts/cancels a USB transfer request. Always returns 0 to indicate success.
 */
static int _dwc2_hcd_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
                                 int status)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        int rc;
        unsigned long flags;

        dev_dbg(hsotg->dev, "DWC OTG HCD URB Dequeue\n");
        dwc2_dump_urb_info(hcd, urb, "urb_dequeue");

        spin_lock_irqsave(&hsotg->lock, flags);

        rc = usb_hcd_check_unlink_urb(hcd, urb, status);
        if (rc)
                goto out;

        if (!urb->hcpriv) {
                dev_dbg(hsotg->dev, "## urb->hcpriv is NULL ##\n");
                goto out;
        }

        rc = dwc2_hcd_urb_dequeue(hsotg, urb->hcpriv);

        usb_hcd_unlink_urb_from_ep(hcd, urb);

        kfree(urb->hcpriv);
        urb->hcpriv = NULL;

        /* Higher layer software sets URB status */
        spin_unlock(&hsotg->lock);
        usb_hcd_giveback_urb(hcd, urb, status);
        spin_lock(&hsotg->lock);

        dev_dbg(hsotg->dev, "Called usb_hcd_giveback_urb()\n");
        dev_dbg(hsotg->dev, "  urb->status = %d\n", urb->status);
out:
        spin_unlock_irqrestore(&hsotg->lock, flags);

        return rc;
}

/*
 * Frees resources in the DWC_otg controller related to a given endpoint. Also
 * clears state in the HCD related to the endpoint. Any URBs for the endpoint
 * must already be dequeued.
 */
static void _dwc2_hcd_endpoint_disable(struct usb_hcd *hcd,
                                       struct usb_host_endpoint *ep)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        dev_dbg(hsotg->dev,
                "DWC OTG HCD EP DISABLE: bEndpointAddress=0x%02x, ep->hcpriv=%p\n",
                ep->desc.bEndpointAddress, ep->hcpriv);
        dwc2_hcd_endpoint_disable(hsotg, ep, 250);
}

/*
 * Resets endpoint specific parameter values, in current version used to reset
 * the data toggle (as a WA). This function can be called from usb_clear_halt
 * routine.
 */
static void _dwc2_hcd_endpoint_reset(struct usb_hcd *hcd,
                                     struct usb_host_endpoint *ep)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        unsigned long flags;

        dev_dbg(hsotg->dev,
                "DWC OTG HCD EP RESET: bEndpointAddress=0x%02x\n",
                ep->desc.bEndpointAddress);

        spin_lock_irqsave(&hsotg->lock, flags);
        dwc2_hcd_endpoint_reset(hsotg, ep);
        spin_unlock_irqrestore(&hsotg->lock, flags);
}

/*
 * Handles host mode interrupts for the DWC_otg controller. Returns IRQ_NONE if
 * there was no interrupt to handle. Returns IRQ_HANDLED if there was a valid
 * interrupt.
 *
 * This function is called by the USB core when an interrupt occurs
 */
static irqreturn_t _dwc2_hcd_irq(struct usb_hcd *hcd)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        return dwc2_handle_hcd_intr(hsotg);
}

/*
 * Creates Status Change bitmap for the root hub and root port. The bitmap is
 * returned in buf. Bit 0 is the status change indicator for the root hub. Bit 1
 * is the status change indicator for the single root port. Returns 1 if either
 * change indicator is 1, otherwise returns 0.
 */
static int _dwc2_hcd_hub_status_data(struct usb_hcd *hcd, char *buf)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);

        buf[0] = dwc2_hcd_is_status_changed(hsotg, 1) << 1;
        return buf[0] != 0;
}

/* Handles hub class-specific requests */
static int _dwc2_hcd_hub_control(struct usb_hcd *hcd, u16 typereq, u16 wvalue,
                                 u16 windex, char *buf, u16 wlength)
{
        int retval = dwc2_hcd_hub_control(dwc2_hcd_to_hsotg(hcd), typereq,
                                          wvalue, windex, buf, wlength);
        return retval;
}

/* Handles hub TT buffer clear completions */
static void _dwc2_hcd_clear_tt_buffer_complete(struct usb_hcd *hcd,
                                               struct usb_host_endpoint *ep)
{
        struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
        struct dwc2_qh *qh;
        unsigned long flags;

        qh = ep->hcpriv;
        if (!qh)
                return;

        spin_lock_irqsave(&hsotg->lock, flags);
        qh->tt_buffer_dirty = 0;

        if (hsotg->flags.b.port_connect_status)
                dwc2_hcd_queue_transactions(hsotg, DWC2_TRANSACTION_ALL);

        spin_unlock_irqrestore(&hsotg->lock, flags);
}

static struct hc_driver dwc2_hc_driver = {
        .description = "dwc2_hsotg",
        .product_desc = "DWC OTG Controller",
        .hcd_priv_size = sizeof(struct wrapper_priv_data),

        .irq = _dwc2_hcd_irq,
        .flags = HCD_MEMORY | HCD_USB2,

        .start = _dwc2_hcd_start,
        .stop = _dwc2_hcd_stop,
        .urb_enqueue = _dwc2_hcd_urb_enqueue,
        .urb_dequeue = _dwc2_hcd_urb_dequeue,
        .endpoint_disable = _dwc2_hcd_endpoint_disable,
        .endpoint_reset = _dwc2_hcd_endpoint_reset,
        .get_frame_number = _dwc2_hcd_get_frame_number,

        .hub_status_data = _dwc2_hcd_hub_status_data,
        .hub_control = _dwc2_hcd_hub_control,
        .clear_tt_buffer_complete = _dwc2_hcd_clear_tt_buffer_complete,
};

/*
 * Frees secondary storage associated with the dwc2_hsotg structure contained
 * in the struct usb_hcd field
 */
static void dwc2_hcd_free(struct dwc2_hsotg *hsotg)
{
        u32 ahbcfg;
        u32 dctl;
        int i;

        dev_dbg(hsotg->dev, "DWC OTG HCD FREE\n");

        /* Free memory for QH/QTD lists */
        dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_inactive);
        dwc2_qh_list_free(hsotg, &hsotg->non_periodic_sched_active);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_inactive);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_ready);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_assigned);
        dwc2_qh_list_free(hsotg, &hsotg->periodic_sched_queued);

        /* Free memory for the host channels */
        for (i = 0; i < MAX_EPS_CHANNELS; i++) {
                struct dwc2_host_chan *chan = hsotg->hc_ptr_array[i];

                if (chan != NULL) {
                        dev_dbg(hsotg->dev, "HCD Free channel #%i, chan=%p\n",
                                i, chan);
                        hsotg->hc_ptr_array[i] = NULL;
                        kfree(chan);
                }
        }

        if (hsotg->core_params->dma_enable > 0) {
                if (hsotg->status_buf) {
                        dma_free_coherent(hsotg->dev, DWC2_HCD_STATUS_BUF_SIZE,
                                          hsotg->status_buf,
                                          hsotg->status_buf_dma);
                        hsotg->status_buf = NULL;
                }
        } else {
                kfree(hsotg->status_buf);
                hsotg->status_buf = NULL;
        }

        ahbcfg = readl(hsotg->regs + GAHBCFG);

        /* Disable all interrupts */
        ahbcfg &= ~GAHBCFG_GLBL_INTR_EN;
        writel(ahbcfg, hsotg->regs + GAHBCFG);
        writel(0, hsotg->regs + GINTMSK);

        if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a) {
                dctl = readl(hsotg->regs + DCTL);
                dctl |= DCTL_SFTDISCON;
                writel(dctl, hsotg->regs + DCTL);
        }

        if (hsotg->wq_otg) {
                if (!cancel_work_sync(&hsotg->wf_otg))
                        flush_workqueue(hsotg->wq_otg);
                destroy_workqueue(hsotg->wq_otg);
        }

        kfree(hsotg->core_params);
        hsotg->core_params = NULL;
        del_timer(&hsotg->wkp_timer);
}

static void dwc2_hcd_release(struct dwc2_hsotg *hsotg)
{
        /* Turn off all host-specific interrupts */
        dwc2_disable_host_interrupts(hsotg);

        dwc2_hcd_free(hsotg);
}

/*
 * Sets all parameters to the given value.
 *
 * Assumes that the dwc2_core_params struct contains only integers.
 */
void dwc2_set_all_params(struct dwc2_core_params *params, int value)
{
        int *p = (int *)params;
        size_t size = sizeof(*params) / sizeof(*p);
        int i;

        for (i = 0; i < size; i++)
                p[i] = value;
}
EXPORT_SYMBOL_GPL(dwc2_set_all_params);

/*
 * Initializes the HCD. This function allocates memory for and initializes the
 * static parts of the usb_hcd and dwc2_hsotg structures. It also registers the
 * USB bus with the core and calls the hc_driver->start() function. It returns
 * a negative error on failure.
 */
int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq,
                  const struct dwc2_core_params *params)
{
        struct usb_hcd *hcd;
        struct dwc2_host_chan *channel;
        u32 hcfg;
        int i, num_channels;
        int retval;

        dev_dbg(hsotg->dev, "DWC OTG HCD INIT\n");

        /* Detect config values from hardware */
        retval = dwc2_get_hwparams(hsotg);

        if (retval)
                return retval;

        retval = -ENOMEM;

        hcfg = readl(hsotg->regs + HCFG);
        dev_dbg(hsotg->dev, "hcfg=%08x\n", hcfg);

#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
        hsotg->frame_num_array = kzalloc(sizeof(*hsotg->frame_num_array) *
                                         FRAME_NUM_ARRAY_SIZE, GFP_KERNEL);
        if (!hsotg->frame_num_array)
                goto error1;
        hsotg->last_frame_num_array = kzalloc(
                        sizeof(*hsotg->last_frame_num_array) *
                        FRAME_NUM_ARRAY_SIZE, GFP_KERNEL);
        if (!hsotg->last_frame_num_array)
                goto error1;
        hsotg->last_frame_num = HFNUM_MAX_FRNUM;
#endif

        hsotg->core_params = kzalloc(sizeof(*hsotg->core_params), GFP_KERNEL);
        if (!hsotg->core_params)
                goto error1;

        dwc2_set_all_params(hsotg->core_params, -1);

        /* Validate parameter values */
        dwc2_set_parameters(hsotg, params);

        /* Check if the bus driver or platform code has setup a dma_mask */
        if (hsotg->core_params->dma_enable > 0 &&
            hsotg->dev->dma_mask == NULL) {
                dev_warn(hsotg->dev,
                         "dma_mask not set, disabling DMA\n");
                hsotg->core_params->dma_enable = 0;
                hsotg->core_params->dma_desc_enable = 0;
        }

        /* Set device flags indicating whether the HCD supports DMA */
        if (hsotg->core_params->dma_enable > 0) {
                if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
                        dev_warn(hsotg->dev, "can't set DMA mask\n");
                if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
                        dev_warn(hsotg->dev, "can't set coherent DMA mask\n");
        }

        hcd = usb_create_hcd(&dwc2_hc_driver, hsotg->dev, dev_name(hsotg->dev));
        if (!hcd)
                goto error1;

        if (hsotg->core_params->dma_enable <= 0)
                hcd->self.uses_dma = 0;

        hcd->has_tt = 1;

        spin_lock_init(&hsotg->lock);
        ((struct wrapper_priv_data *) &hcd->hcd_priv)->hsotg = hsotg;
        hsotg->priv = hcd;

        /*
         * Disable the global interrupt until all the interrupt handlers are
         * installed
         */
        dwc2_disable_global_interrupts(hsotg);

        /* Initialize the DWC_otg core, and select the Phy type */
        retval = dwc2_core_init(hsotg, true, irq);
        if (retval)
                goto error2;

        /* Create new workqueue and init work */
        retval = -ENOMEM;
        hsotg->wq_otg = create_singlethread_workqueue("dwc2");
        if (!hsotg->wq_otg) {
                dev_err(hsotg->dev, "Failed to create workqueue\n");
                goto error2;
        }
        INIT_WORK(&hsotg->wf_otg, dwc2_conn_id_status_change);

        setup_timer(&hsotg->wkp_timer, dwc2_wakeup_detected,
                    (unsigned long)hsotg);

        /* Initialize the non-periodic schedule */
        INIT_LIST_HEAD(&hsotg->non_periodic_sched_inactive);
        INIT_LIST_HEAD(&hsotg->non_periodic_sched_active);

        /* Initialize the periodic schedule */
        INIT_LIST_HEAD(&hsotg->periodic_sched_inactive);
        INIT_LIST_HEAD(&hsotg->periodic_sched_ready);
        INIT_LIST_HEAD(&hsotg->periodic_sched_assigned);
        INIT_LIST_HEAD(&hsotg->periodic_sched_queued);

        /*
         * Create a host channel descriptor for each host channel implemented
         * in the controller. Initialize the channel descriptor array.
         */
        INIT_LIST_HEAD(&hsotg->free_hc_list);
        num_channels = hsotg->core_params->host_channels;
        memset(&hsotg->hc_ptr_array[0], 0, sizeof(hsotg->hc_ptr_array));

        for (i = 0; i < num_channels; i++) {
                channel = kzalloc(sizeof(*channel), GFP_KERNEL);
                if (channel == NULL)
                        goto error3;
                channel->hc_num = i;
                hsotg->hc_ptr_array[i] = channel;
        }

        if (hsotg->core_params->uframe_sched > 0)
                dwc2_hcd_init_usecs(hsotg);

        /* Initialize hsotg start work */
        INIT_DELAYED_WORK(&hsotg->start_work, dwc2_hcd_start_func);

        /* Initialize port reset work */
        INIT_DELAYED_WORK(&hsotg->reset_work, dwc2_hcd_reset_func);

        /*
         * Allocate space for storing data on status transactions. Normally no
         * data is sent, but this space acts as a bit bucket. This must be
         * done after usb_add_hcd since that function allocates the DMA buffer
         * pool.
         */
        if (hsotg->core_params->dma_enable > 0)
                hsotg->status_buf = dma_alloc_coherent(hsotg->dev,
                                        DWC2_HCD_STATUS_BUF_SIZE,
                                        &hsotg->status_buf_dma, GFP_KERNEL);
        else
                hsotg->status_buf = kzalloc(DWC2_HCD_STATUS_BUF_SIZE,
                                          GFP_KERNEL);

        if (!hsotg->status_buf)
                goto error3;

        hsotg->otg_port = 1;
        hsotg->frame_list = NULL;
        hsotg->frame_list_dma = 0;
        hsotg->periodic_qh_count = 0;

        /* Initiate lx_state to L3 disconnected state */
        hsotg->lx_state = DWC2_L3;

        hcd->self.otg_port = hsotg->otg_port;

        /* Don't support SG list at this point */
        hcd->self.sg_tablesize = 0;

        /*
         * Finish generic HCD initialization and start the HCD. This function
         * allocates the DMA buffer pool, registers the USB bus, requests the
         * IRQ line, and calls hcd_start method.
         */
        retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
        if (retval < 0)
                goto error3;

        device_wakeup_enable(hcd->self.controller);

        dwc2_hcd_dump_state(hsotg);

        dwc2_enable_global_interrupts(hsotg);

        return 0;

error3:
        dwc2_hcd_release(hsotg);
error2:
        usb_put_hcd(hcd);
error1:
        kfree(hsotg->core_params);

#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
        kfree(hsotg->last_frame_num_array);
        kfree(hsotg->frame_num_array);
#endif

        dev_err(hsotg->dev, "%s() FAILED, returning %d\n", __func__, retval);
        return retval;
}
EXPORT_SYMBOL_GPL(dwc2_hcd_init);

/*
 * Removes the HCD.
 * Frees memory and resources associated with the HCD and deregisters the bus.
 */
void dwc2_hcd_remove(struct dwc2_hsotg *hsotg)
{
        struct usb_hcd *hcd;

        dev_dbg(hsotg->dev, "DWC OTG HCD REMOVE\n");

        hcd = dwc2_hsotg_to_hcd(hsotg);
        dev_dbg(hsotg->dev, "hsotg->hcd = %p\n", hcd);

        if (!hcd) {
                dev_dbg(hsotg->dev, "%s: dwc2_hsotg_to_hcd(hsotg) NULL!\n",
                        __func__);
                return;
        }

        usb_remove_hcd(hcd);
        hsotg->priv = NULL;
        dwc2_hcd_release(hsotg);
        usb_put_hcd(hcd);

#ifdef CONFIG_USB_DWC2_TRACK_MISSED_SOFS
        kfree(hsotg->last_frame_num_array);
        kfree(hsotg->frame_num_array);
#endif
}
EXPORT_SYMBOL_GPL(dwc2_hcd_remove);