/*
 * URB OHCI HCD (Host Controller Driver) for USB on the PPC440EP.
 *
 * (C) Copyright 2003-2004
 * Gary Jennejohn, DENX Software Engineering <garyj@denx.de>
 *
 * (C) Copyright 2004
 * Pierre Aubert, Staubli Faverges <p.aubert@staubli.com>
 *
 * Note: Much of this code has been derived from Linux 2.4
 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
 * (C) Copyright 2000-2002 David Brownell
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */
/*
 * IMPORTANT NOTES
 * 1 - this driver is intended for use with USB Mass Storage Devices
 *     (BBB) ONLY. There is NO support for Interrupt or Isochronous pipes!
 */

#include <common.h>

#ifdef CONFIG_USB_OHCI

#include <malloc.h>
#include <usb.h>
#include "usb_ohci.h"

#define OHCI_USE_NPS            /* force NoPowerSwitching mode */
#undef OHCI_VERBOSE_DEBUG       /* not always helpful */
#undef DEBUG
#undef SHOW_INFO
#undef OHCI_FILL_TRACE

/* For initializing controller (mask in an HCFS mode too) */
#define OHCI_CONTROL_INIT \
        (OHCI_CTRL_CBSR & 0x3) | OHCI_CTRL_IE | OHCI_CTRL_PLE

#define readl(a) (*((volatile u32 *)(a)))
#define writel(a, b) (*((volatile u32 *)(b)) = ((volatile u32)a))

#ifdef DEBUG
#define dbg(format, arg...) printf("DEBUG: " format "\n", ## arg)
#else
#define dbg(format, arg...) do {} while(0)
#endif /* DEBUG */
#define err(format, arg...) printf("ERROR: " format "\n", ## arg)
#ifdef SHOW_INFO
#define info(format, arg...) printf("INFO: " format "\n", ## arg)
#else
#define info(format, arg...) do {} while(0)
#endif

#define m16_swap(x) swap_16(x)
#define m32_swap(x) swap_32(x)

#if defined(CONFIG_405EZ) || defined(CONFIG_440EP) || defined(CONFIG_440EPX)
#define ohci_cpu_to_le16(x) (x)
#define ohci_cpu_to_le32(x) (x)
#else
#define ohci_cpu_to_le16(x) swap_16(x)
#define ohci_cpu_to_le32(x) swap_32(x)
#endif

/* global ohci_t */
static ohci_t gohci;
/* this must be aligned to a 256 byte boundary */
struct ohci_hcca ghcca[1];
/* a pointer to the aligned storage */
struct ohci_hcca *phcca;
/* this allocates EDs for all possible endpoints */
struct ohci_device ohci_dev;
/* urb_priv */
urb_priv_t urb_priv;
/* RHSC flag */
int got_rhsc;
/* device which was disconnected */
struct usb_device *devgone;
/* flag guarding URB transation */
int urb_finished = 0;

/*-------------------------------------------------------------------------*/

/* AMD-756 (D2 rev) reports corrupt register contents in some cases.
 * The erratum (#4) description is incorrect.  AMD's workaround waits
 * till some bits (mostly reserved) are clear; ok for all revs.
 */
#define OHCI_QUIRK_AMD756 0xabcd
#define read_roothub(hc, register, mask) ({ \
        u32 temp = readl (&hc->regs->roothub.register); \
        if (hc->flags & OHCI_QUIRK_AMD756) \
                while (temp & mask) \
                        temp = readl (&hc->regs->roothub.register); \
        temp; })

static u32 roothub_a (struct ohci *hc)
        { return read_roothub (hc, a, 0xfc0fe000); }
static inline u32 roothub_b (struct ohci *hc)
        { return readl (&hc->regs->roothub.b); }
static inline u32 roothub_status (struct ohci *hc)
        { return readl (&hc->regs->roothub.status); }
static u32 roothub_portstatus (struct ohci *hc, int i)
        { return read_roothub (hc, portstatus [i], 0xffe0fce0); }


/* forward declaration */
static int hc_interrupt (void);
static void
td_submit_job (struct usb_device * dev, unsigned long pipe, void * buffer,
        int transfer_len, struct devrequest * setup, urb_priv_t * urb, int interval);

/*-------------------------------------------------------------------------*
 * URB support functions
 *-------------------------------------------------------------------------*/

/* free HCD-private data associated with this URB */

static void urb_free_priv (urb_priv_t * urb)
{
        int             i;
        int             last;
        struct td       * td;

        last = urb->length - 1;
        if (last >= 0) {
                for (i = 0; i <= last; i++) {
                        td = urb->td[i];
                        if (td) {
                                td->usb_dev = NULL;
                                urb->td[i] = NULL;
                        }
                }
        }
}

/*-------------------------------------------------------------------------*/

#ifdef DEBUG
static int sohci_get_current_frame_number (struct usb_device * dev);

/* debug| print the main components of an URB
 * small: 0) header + data packets 1) just header */

static void pkt_print (struct usb_device * dev, unsigned long pipe, void * buffer,
        int transfer_len, struct devrequest * setup, char * str, int small)
{
        urb_priv_t * purb = &urb_priv;

        dbg("%s URB:[%4x] dev:%2d,ep:%2d-%c,type:%s,len:%d/%d stat:%#lx",
                        str,
                        sohci_get_current_frame_number (dev),
                        usb_pipedevice (pipe),
                        usb_pipeendpoint (pipe),
                        usb_pipeout (pipe)? 'O': 'I',
                        usb_pipetype (pipe) < 2? (usb_pipeint (pipe)? "INTR": "ISOC"):
                                (usb_pipecontrol (pipe)? "CTRL": "BULK"),
                        purb->actual_length,
                        transfer_len, dev->status);
#ifdef  OHCI_VERBOSE_DEBUG
        if (!small) {
                int i, len;

                if (usb_pipecontrol (pipe)) {
                        printf (__FILE__ ": cmd(8):");
                        for (i = 0; i < 8 ; i++)
                                printf (" %02x", ((__u8 *) setup) [i]);
                        printf ("\n");
                }
                if (transfer_len > 0 && buffer) {
                        printf (__FILE__ ": data(%d/%d):",
                                purb->actual_length,
                                transfer_len);
                        len = usb_pipeout (pipe)?
                                        transfer_len: purb->actual_length;
                        for (i = 0; i < 16 && i < len; i++)
                                printf (" %02x", ((__u8 *) buffer) [i]);
                        printf ("%s\n", i < len? "...": "");
                }
        }
#endif
}

/* just for debugging; prints non-empty branches of the int ed tree inclusive iso eds*/
void ep_print_int_eds (ohci_t *ohci, char * str) {
        int i, j;
         __u32 * ed_p;
        for (i= 0; i < 32; i++) {
                j = 5;
                ed_p = &(ohci->hcca->int_table [i]);
                if (*ed_p == 0)
                    continue;
                printf (__FILE__ ": %s branch int %2d(%2x):", str, i, i);
                while (*ed_p != 0 && j--) {
                        ed_t *ed = (ed_t *)ohci_cpu_to_le32(ed_p);
                        printf (" ed: %4x;", ed->hwINFO);
                        ed_p = &ed->hwNextED;
                }
                printf ("\n");
        }
}

static void ohci_dump_intr_mask (char *label, __u32 mask)
{
        dbg ("%s: 0x%08x%s%s%s%s%s%s%s%s%s",
                label,
                mask,
                (mask & OHCI_INTR_MIE) ? " MIE" : "",
                (mask & OHCI_INTR_OC) ? " OC" : "",
                (mask & OHCI_INTR_RHSC) ? " RHSC" : "",
                (mask & OHCI_INTR_FNO) ? " FNO" : "",
                (mask & OHCI_INTR_UE) ? " UE" : "",
                (mask & OHCI_INTR_RD) ? " RD" : "",
                (mask & OHCI_INTR_SF) ? " SF" : "",
                (mask & OHCI_INTR_WDH) ? " WDH" : "",
                (mask & OHCI_INTR_SO) ? " SO" : ""
                );
}

static void maybe_print_eds (char *label, __u32 value)
{
        ed_t *edp = (ed_t *)value;

        if (value) {
                dbg ("%s %08x", label, value);
                dbg ("%08x", edp->hwINFO);
                dbg ("%08x", edp->hwTailP);
                dbg ("%08x", edp->hwHeadP);
                dbg ("%08x", edp->hwNextED);
        }
}

static char * hcfs2string (int state)
{
        switch (state) {
                case OHCI_USB_RESET:    return "reset";
                case OHCI_USB_RESUME:   return "resume";
                case OHCI_USB_OPER:     return "operational";
                case OHCI_USB_SUSPEND:  return "suspend";
        }
        return "?";
}

/* dump control and status registers */
static void ohci_dump_status (ohci_t *controller)
{
        struct ohci_regs        *regs = controller->regs;
        __u32                   temp;

        temp = readl (&regs->revision) & 0xff;
        if (temp != 0x10)
                dbg ("spec %d.%d", (temp >> 4), (temp & 0x0f));

        temp = readl (&regs->control);
        dbg ("control: 0x%08x%s%s%s HCFS=%s%s%s%s%s CBSR=%d", temp,
                (temp & OHCI_CTRL_RWE) ? " RWE" : "",
                (temp & OHCI_CTRL_RWC) ? " RWC" : "",
                (temp & OHCI_CTRL_IR) ? " IR" : "",
                hcfs2string (temp & OHCI_CTRL_HCFS),
                (temp & OHCI_CTRL_BLE) ? " BLE" : "",
                (temp & OHCI_CTRL_CLE) ? " CLE" : "",
                (temp & OHCI_CTRL_IE) ? " IE" : "",
                (temp & OHCI_CTRL_PLE) ? " PLE" : "",
                temp & OHCI_CTRL_CBSR
                );

        temp = readl (&regs->cmdstatus);
        dbg ("cmdstatus: 0x%08x SOC=%d%s%s%s%s", temp,
                (temp & OHCI_SOC) >> 16,
                (temp & OHCI_OCR) ? " OCR" : "",
                (temp & OHCI_BLF) ? " BLF" : "",
                (temp & OHCI_CLF) ? " CLF" : "",
                (temp & OHCI_HCR) ? " HCR" : ""
                );

        ohci_dump_intr_mask ("intrstatus", readl (&regs->intrstatus));
        ohci_dump_intr_mask ("intrenable", readl (&regs->intrenable));

        maybe_print_eds ("ed_periodcurrent", readl (&regs->ed_periodcurrent));

        maybe_print_eds ("ed_controlhead", readl (&regs->ed_controlhead));
        maybe_print_eds ("ed_controlcurrent", readl (&regs->ed_controlcurrent));

        maybe_print_eds ("ed_bulkhead", readl (&regs->ed_bulkhead));
        maybe_print_eds ("ed_bulkcurrent", readl (&regs->ed_bulkcurrent));

        maybe_print_eds ("donehead", readl (&regs->donehead));
}

static void ohci_dump_roothub (ohci_t *controller, int verbose)
{
        __u32                   temp, ndp, i;

        temp = roothub_a (controller);
        ndp = (temp & RH_A_NDP);

        if (verbose) {
                dbg ("roothub.a: %08x POTPGT=%d%s%s%s%s%s NDP=%d", temp,
                        ((temp & RH_A_POTPGT) >> 24) & 0xff,
                        (temp & RH_A_NOCP) ? " NOCP" : "",
                        (temp & RH_A_OCPM) ? " OCPM" : "",
                        (temp & RH_A_DT) ? " DT" : "",
                        (temp & RH_A_NPS) ? " NPS" : "",
                        (temp & RH_A_PSM) ? " PSM" : "",
                        ndp
                        );
                temp = roothub_b (controller);
                dbg ("roothub.b: %08x PPCM=%04x DR=%04x",
                        temp,
                        (temp & RH_B_PPCM) >> 16,
                        (temp & RH_B_DR)
                        );
                temp = roothub_status (controller);
                dbg ("roothub.status: %08x%s%s%s%s%s%s",
                        temp,
                        (temp & RH_HS_CRWE) ? " CRWE" : "",
                        (temp & RH_HS_OCIC) ? " OCIC" : "",
                        (temp & RH_HS_LPSC) ? " LPSC" : "",
                        (temp & RH_HS_DRWE) ? " DRWE" : "",
                        (temp & RH_HS_OCI) ? " OCI" : "",
                        (temp & RH_HS_LPS) ? " LPS" : ""
                        );
        }

        for (i = 0; i < ndp; i++) {
                temp = roothub_portstatus (controller, i);
                dbg ("roothub.portstatus [%d] = 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s",
                        i,
                        temp,
                        (temp & RH_PS_PRSC) ? " PRSC" : "",
                        (temp & RH_PS_OCIC) ? " OCIC" : "",
                        (temp & RH_PS_PSSC) ? " PSSC" : "",
                        (temp & RH_PS_PESC) ? " PESC" : "",
                        (temp & RH_PS_CSC) ? " CSC" : "",

                        (temp & RH_PS_LSDA) ? " LSDA" : "",
                        (temp & RH_PS_PPS) ? " PPS" : "",
                        (temp & RH_PS_PRS) ? " PRS" : "",
                        (temp & RH_PS_POCI) ? " POCI" : "",
                        (temp & RH_PS_PSS) ? " PSS" : "",

                        (temp & RH_PS_PES) ? " PES" : "",
                        (temp & RH_PS_CCS) ? " CCS" : ""
                        );
        }
}

static void ohci_dump (ohci_t *controller, int verbose)
{
        dbg ("OHCI controller usb-%s state", controller->slot_name);

        /* dumps some of the state we know about */
        ohci_dump_status (controller);
        if (verbose)
                ep_print_int_eds (controller, "hcca");
        dbg ("hcca frame #%04x", controller->hcca->frame_no);
        ohci_dump_roothub (controller, 1);
}


#endif /* DEBUG */

/*-------------------------------------------------------------------------*
 * Interface functions (URB)
 *-------------------------------------------------------------------------*/

/* get a transfer request */

int sohci_submit_job(struct usb_device *dev, unsigned long pipe, void *buffer,
                int transfer_len, struct devrequest *setup, int interval)
{
        ohci_t *ohci;
        ed_t * ed;
        urb_priv_t *purb_priv;
        int i, size = 0;

        ohci = &gohci;

        /* when controller's hung, permit only roothub cleanup attempts
         * such as powering down ports */
        if (ohci->disabled) {
                err("sohci_submit_job: EPIPE");
                return -1;
        }

        /* if we have an unfinished URB from previous transaction let's
         * fail and scream as quickly as possible so as not to corrupt
         * further communication */
        if (!urb_finished) {
                err("sohci_submit_job: URB NOT FINISHED");
                return -1;
        }
        /* we're about to begin a new transaction here so mark the URB unfinished */
        urb_finished = 0;

        /* every endpoint has a ed, locate and fill it */
        if (!(ed = ep_add_ed (dev, pipe))) {
                err("sohci_submit_job: ENOMEM");
                return -1;
        }

        /* for the private part of the URB we need the number of TDs (size) */
        switch (usb_pipetype (pipe)) {
                case PIPE_BULK: /* one TD for every 4096 Byte */
                        size = (transfer_len - 1) / 4096 + 1;
                        break;
                case PIPE_CONTROL: /* 1 TD for setup, 1 for ACK and 1 for every 4096 B */
                        size = (transfer_len == 0)? 2:
                                                (transfer_len - 1) / 4096 + 3;
                        break;
        }

        if (size >= (N_URB_TD - 1)) {
                err("need %d TDs, only have %d", size, N_URB_TD);
                return -1;
        }
        purb_priv = &urb_priv;
        purb_priv->pipe = pipe;

        /* fill the private part of the URB */
        purb_priv->length = size;
        purb_priv->ed = ed;
        purb_priv->actual_length = 0;

        /* allocate the TDs */
        /* note that td[0] was allocated in ep_add_ed */
        for (i = 0; i < size; i++) {
                purb_priv->td[i] = td_alloc (dev);
                if (!purb_priv->td[i]) {
                        purb_priv->length = i;
                        urb_free_priv (purb_priv);
                        err("sohci_submit_job: ENOMEM");
                        return -1;
                }
        }

        if (ed->state == ED_NEW || (ed->state & ED_DEL)) {
                urb_free_priv (purb_priv);
                err("sohci_submit_job: EINVAL");
                return -1;
        }

        /* link the ed into a chain if is not already */
        if (ed->state != ED_OPER)
                ep_link (ohci, ed);

        /* fill the TDs and link it to the ed */
        td_submit_job(dev, pipe, buffer, transfer_len, setup, purb_priv, interval);

        return 0;
}

/*-------------------------------------------------------------------------*/

#ifdef DEBUG
/* tell us the current USB frame number */

static int sohci_get_current_frame_number (struct usb_device *usb_dev)
{
        ohci_t *ohci = &gohci;

        return ohci_cpu_to_le16 (ohci->hcca->frame_no);
}
#endif

/*-------------------------------------------------------------------------*
 * ED handling functions
 *-------------------------------------------------------------------------*/

/* link an ed into one of the HC chains */

static int ep_link (ohci_t *ohci, ed_t *edi)
{
        volatile ed_t *ed = edi;

        ed->state = ED_OPER;

        switch (ed->type) {
        case PIPE_CONTROL:
                ed->hwNextED = 0;
                if (ohci->ed_controltail == NULL) {
                        writel (ed, &ohci->regs->ed_controlhead);
                } else {
                        ohci->ed_controltail->hwNextED = ohci_cpu_to_le32 ((unsigned long)ed);
                }
                ed->ed_prev = ohci->ed_controltail;
                if (!ohci->ed_controltail && !ohci->ed_rm_list[0] &&
                        !ohci->ed_rm_list[1] && !ohci->sleeping) {
                        ohci->hc_control |= OHCI_CTRL_CLE;
                        writel (ohci->hc_control, &ohci->regs->control);
                }
                ohci->ed_controltail = edi;
                break;

        case PIPE_BULK:
                ed->hwNextED = 0;
                if (ohci->ed_bulktail == NULL) {
                        writel (ed, &ohci->regs->ed_bulkhead);
                } else {
                        ohci->ed_bulktail->hwNextED = ohci_cpu_to_le32 ((unsigned long)ed);
                }
                ed->ed_prev = ohci->ed_bulktail;
                if (!ohci->ed_bulktail && !ohci->ed_rm_list[0] &&
                        !ohci->ed_rm_list[1] && !ohci->sleeping) {
                        ohci->hc_control |= OHCI_CTRL_BLE;
                        writel (ohci->hc_control, &ohci->regs->control);
                }
                ohci->ed_bulktail = edi;
                break;
        }
        return 0;
}

/*-------------------------------------------------------------------------*/

/* unlink an ed from one of the HC chains.
 * just the link to the ed is unlinked.
 * the link from the ed still points to another operational ed or 0
 * so the HC can eventually finish the processing of the unlinked ed */

static int ep_unlink (ohci_t *ohci, ed_t *edi)
{
        volatile ed_t *ed = edi;

        ed->hwINFO |= ohci_cpu_to_le32 (OHCI_ED_SKIP);

        switch (ed->type) {
        case PIPE_CONTROL:
                if (ed->ed_prev == NULL) {
                        if (!ed->hwNextED) {
                                ohci->hc_control &= ~OHCI_CTRL_CLE;
                                writel (ohci->hc_control, &ohci->regs->control);
                        }
                        writel (ohci_cpu_to_le32 (*((__u32 *)&ed->hwNextED)), &ohci->regs->ed_controlhead);
                } else {
                        ed->ed_prev->hwNextED = ed->hwNextED;
                }
                if (ohci->ed_controltail == ed) {
                        ohci->ed_controltail = ed->ed_prev;
                } else {
                        ((ed_t *)ohci_cpu_to_le32 (*((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev;
                }
                break;

        case PIPE_BULK:
                if (ed->ed_prev == NULL) {
                        if (!ed->hwNextED) {
                                ohci->hc_control &= ~OHCI_CTRL_BLE;
                                writel (ohci->hc_control, &ohci->regs->control);
                        }
                        writel (ohci_cpu_to_le32 (*((__u32 *)&ed->hwNextED)), &ohci->regs->ed_bulkhead);
                } else {
                        ed->ed_prev->hwNextED = ed->hwNextED;
                }
                if (ohci->ed_bulktail == ed) {
                        ohci->ed_bulktail = ed->ed_prev;
                } else {
                        ((ed_t *)ohci_cpu_to_le32 (*((__u32 *)&ed->hwNextED)))->ed_prev = ed->ed_prev;
                }
                break;
        }
        ed->state = ED_UNLINK;
        return 0;
}


/*-------------------------------------------------------------------------*/

/* add/reinit an endpoint; this should be done once at the usb_set_configuration command,
 * but the USB stack is a little bit stateless  so we do it at every transaction
 * if the state of the ed is ED_NEW then a dummy td is added and the state is changed to ED_UNLINK
 * in all other cases the state is left unchanged
 * the ed info fields are setted anyway even though most of them should not change */

static ed_t * ep_add_ed (struct usb_device *usb_dev, unsigned long pipe)
{
        td_t *td;
        ed_t *ed_ret;
        volatile ed_t *ed;

        ed = ed_ret = &ohci_dev.ed[(usb_pipeendpoint (pipe) << 1) |
                        (usb_pipecontrol (pipe)? 0: usb_pipeout (pipe))];

        if ((ed->state & ED_DEL) || (ed->state & ED_URB_DEL)) {
                err("ep_add_ed: pending delete");
                /* pending delete request */
                return NULL;
        }

        if (ed->state == ED_NEW) {
                ed->hwINFO = ohci_cpu_to_le32 (OHCI_ED_SKIP); /* skip ed */
                /* dummy td; end of td list for ed */
                td = td_alloc (usb_dev);
                ed->hwTailP = ohci_cpu_to_le32 ((unsigned long)td);
                ed->hwHeadP = ed->hwTailP;
                ed->state = ED_UNLINK;
                ed->type = usb_pipetype (pipe);
                ohci_dev.ed_cnt++;
        }

        ed->hwINFO = ohci_cpu_to_le32 (usb_pipedevice (pipe)
                        | usb_pipeendpoint (pipe) << 7
                        | (usb_pipeisoc (pipe)? 0x8000: 0)
                        | (usb_pipecontrol (pipe)? 0: (usb_pipeout (pipe)? 0x800: 0x1000))
                        | (usb_dev->speed == USB_SPEED_LOW) << 13
                        | usb_maxpacket (usb_dev, pipe) << 16);

        return ed_ret;
}

/*-------------------------------------------------------------------------*
 * TD handling functions
 *-------------------------------------------------------------------------*/

/* enqueue next TD for this URB (OHCI spec 5.2.8.2) */

static void td_fill (ohci_t *ohci, unsigned int info,
        void *data, int len,
        struct usb_device *dev, int index, urb_priv_t *urb_priv)
{
        volatile td_t  *td, *td_pt;
#ifdef OHCI_FILL_TRACE
        int i;
#endif

        if (index > urb_priv->length) {
                err("index > length");
                return;
        }
        /* use this td as the next dummy */
        td_pt = urb_priv->td [index];
        td_pt->hwNextTD = 0;

        /* fill the old dummy TD */
        td = urb_priv->td [index] = (td_t *)(ohci_cpu_to_le32 (urb_priv->ed->hwTailP) & ~0xf);

        td->ed = urb_priv->ed;
        td->next_dl_td = NULL;
        td->index = index;
        td->data = (__u32)data;
#ifdef OHCI_FILL_TRACE
        if (usb_pipebulk(urb_priv->pipe) && usb_pipeout(urb_priv->pipe)) {
                for (i = 0; i < len; i++)
                printf("td->data[%d] %#2x ",i, ((unsigned char *)td->data)[i]);
                printf("\n");
        }
#endif
        if (!len)
                data = 0;

        td->hwINFO = ohci_cpu_to_le32 (info);
        td->hwCBP = ohci_cpu_to_le32 ((unsigned long)data);
        if (data)
                td->hwBE = ohci_cpu_to_le32 ((unsigned long)(data + len - 1));
        else
                td->hwBE = 0;
        td->hwNextTD = ohci_cpu_to_le32 ((unsigned long)td_pt);

        /* append to queue */
        td->ed->hwTailP = td->hwNextTD;
}

/*-------------------------------------------------------------------------*/

/* prepare all TDs of a transfer */
static void td_submit_job (struct usb_device *dev, unsigned long pipe, void *buffer,
        int transfer_len, struct devrequest *setup, urb_priv_t *urb, int interval)
{
        ohci_t *ohci = &gohci;
        int data_len = transfer_len;
        void *data;
        int cnt = 0;
        __u32 info = 0;
        unsigned int toggle = 0;

        /* OHCI handles the DATA-toggles itself, we just use the USB-toggle bits for reseting */
        if(usb_gettoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe))) {
                toggle = TD_T_TOGGLE;
        } else {
                toggle = TD_T_DATA0;
                usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 1);
        }
        urb->td_cnt = 0;
        if (data_len)
                data = buffer;
        else
                data = 0;

        switch (usb_pipetype (pipe)) {
        case PIPE_BULK:
                info = usb_pipeout (pipe)?
                        TD_CC | TD_DP_OUT : TD_CC | TD_DP_IN ;
                while(data_len > 4096) {
                        td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, 4096, dev, cnt, urb);
                        data += 4096; data_len -= 4096; cnt++;
                }
                info = usb_pipeout (pipe)?
                        TD_CC | TD_DP_OUT : TD_CC | TD_R | TD_DP_IN ;
                td_fill (ohci, info | (cnt? TD_T_TOGGLE:toggle), data, data_len, dev, cnt, urb);
                cnt++;

                if (!ohci->sleeping)
                        writel (OHCI_BLF, &ohci->regs->cmdstatus); /* start bulk list */
                break;

        case PIPE_CONTROL:
                info = TD_CC | TD_DP_SETUP | TD_T_DATA0;
                td_fill (ohci, info, setup, 8, dev, cnt++, urb);
                if (data_len > 0) {
                        info = usb_pipeout (pipe)?
                                TD_CC | TD_R | TD_DP_OUT | TD_T_DATA1 : TD_CC | TD_R | TD_DP_IN | TD_T_DATA1;
                        /* NOTE:  mishandles transfers >8K, some >4K */
                        td_fill (ohci, info, data, data_len, dev, cnt++, urb);
                }
                info = usb_pipeout (pipe)?
                        TD_CC | TD_DP_IN | TD_T_DATA1: TD_CC | TD_DP_OUT | TD_T_DATA1;
                td_fill (ohci, info, data, 0, dev, cnt++, urb);
                if (!ohci->sleeping)
                        writel (OHCI_CLF, &ohci->regs->cmdstatus); /* start Control list */
                break;
        }
        if (urb->length != cnt)
                dbg("TD LENGTH %d != CNT %d", urb->length, cnt);
}

/*-------------------------------------------------------------------------*
 * Done List handling functions
 *-------------------------------------------------------------------------*/


/* calculate the transfer length and update the urb */

static void dl_transfer_length(td_t * td)
{
        __u32 tdBE, tdCBP;
        urb_priv_t *lurb_priv = &urb_priv;

        tdBE   = ohci_cpu_to_le32 (td->hwBE);
        tdCBP  = ohci_cpu_to_le32 (td->hwCBP);


        if (!(usb_pipecontrol(lurb_priv->pipe) &&
            ((td->index == 0) || (td->index == lurb_priv->length - 1)))) {
                if (tdBE != 0) {
                        if (td->hwCBP == 0)
                                lurb_priv->actual_length += tdBE - td->data + 1;
                        else
                                lurb_priv->actual_length += tdCBP - td->data;
                }
        }
}

/*-------------------------------------------------------------------------*/

/* replies to the request have to be on a FIFO basis so
 * we reverse the reversed done-list */

static td_t * dl_reverse_done_list (ohci_t *ohci)
{
        __u32 td_list_hc;
        td_t *td_rev = NULL;
        td_t *td_list = NULL;
        urb_priv_t *lurb_priv = NULL;

        td_list_hc = ohci_cpu_to_le32 (ohci->hcca->done_head) & 0xfffffff0;
        ohci->hcca->done_head = 0;

        while (td_list_hc) {
                td_list = (td_t *)td_list_hc;

                if (TD_CC_GET (ohci_cpu_to_le32 (td_list->hwINFO))) {
                        lurb_priv = &urb_priv;
                        dbg(" USB-error/status: %x : %p",
                                        TD_CC_GET (ohci_cpu_to_le32 (td_list->hwINFO)), td_list);
                        if (td_list->ed->hwHeadP & ohci_cpu_to_le32 (0x1)) {
                                if (lurb_priv && ((td_list->index + 1) < lurb_priv->length)) {
                                        td_list->ed->hwHeadP =
                                                (lurb_priv->td[lurb_priv->length - 1]->hwNextTD & ohci_cpu_to_le32 (0xfffffff0)) |
                                                                        (td_list->ed->hwHeadP & ohci_cpu_to_le32 (0x2));
                                        lurb_priv->td_cnt += lurb_priv->length - td_list->index - 1;
                                } else
                                        td_list->ed->hwHeadP &= ohci_cpu_to_le32 (0xfffffff2);
                        }
#ifdef CONFIG_MPC5200
                        td_list->hwNextTD = 0;
#endif
                }

                td_list->next_dl_td = td_rev;
                td_rev = td_list;
                td_list_hc = ohci_cpu_to_le32 (td_list->hwNextTD) & 0xfffffff0;
        }
        return td_list;
}

/*-------------------------------------------------------------------------*/

/* td done list */
static int dl_done_list (ohci_t *ohci, td_t *td_list)
{
        td_t *td_list_next = NULL;
        ed_t *ed;
        int cc = 0;
        int stat = 0;
        /* urb_t *urb; */
        urb_priv_t *lurb_priv;
        __u32 tdINFO, edHeadP, edTailP;

        while (td_list) {
                td_list_next = td_list->next_dl_td;

                lurb_priv = &urb_priv;
                tdINFO = ohci_cpu_to_le32 (td_list->hwINFO);

                ed = td_list->ed;

                dl_transfer_length(td_list);

                /* error code of transfer */
                cc = TD_CC_GET (tdINFO);
                if (++(lurb_priv->td_cnt) == lurb_priv->length) {
                        if ((ed->state & (ED_OPER | ED_UNLINK))
                                        && (lurb_priv->state != URB_DEL)) {
                                dbg("ConditionCode %#x", cc);
                                stat = cc_to_error[cc];
                                urb_finished = 1;
                        }
                }

                if (ed->state != ED_NEW) {
                        edHeadP = ohci_cpu_to_le32 (ed->hwHeadP) & 0xfffffff0;
                        edTailP = ohci_cpu_to_le32 (ed->hwTailP);

                        /* unlink eds if they are not busy */
                        if ((edHeadP == edTailP) && (ed->state == ED_OPER))
                                ep_unlink (ohci, ed);
                }

                td_list = td_list_next;
        }
        return stat;
}

/*-------------------------------------------------------------------------*
 * Virtual Root Hub
 *-------------------------------------------------------------------------*/

#include <usbroothubdes.h>

/* Hub class-specific descriptor is constructed dynamically */


/*-------------------------------------------------------------------------*/

#define OK(x)                   len = (x); break
#ifdef DEBUG
#define WR_RH_STAT(x)           {info("WR:status %#8x", (x));writel((x), &gohci.regs->roothub.status);}
#define WR_RH_PORTSTAT(x)       {info("WR:portstatus[%d] %#8x", wIndex-1, (x));writel((x), &gohci.regs->roothub.portstatus[wIndex-1]);}
#else
#define WR_RH_STAT(x)           writel((x), &gohci.regs->roothub.status)
#define WR_RH_PORTSTAT(x)       writel((x), &gohci.regs->roothub.portstatus[wIndex-1])
#endif
#define RD_RH_STAT              roothub_status(&gohci)
#define RD_RH_PORTSTAT          roothub_portstatus(&gohci,wIndex-1)

/* request to virtual root hub */

int rh_check_port_status(ohci_t *controller)
{
        __u32 temp, ndp, i;
        int res;

        res = -1;
        temp = roothub_a (controller);
        ndp = (temp & RH_A_NDP);
        for (i = 0; i < ndp; i++) {
                temp = roothub_portstatus (controller, i);
                /* check for a device disconnect */
                if (((temp & (RH_PS_PESC | RH_PS_CSC)) ==
                        (RH_PS_PESC | RH_PS_CSC)) &&
                        ((temp & RH_PS_CCS) == 0)) {
                        res = i;
                        break;
                }
        }
        return res;
}

static int ohci_submit_rh_msg(struct usb_device *dev, unsigned long pipe,
                void *buffer, int transfer_len, struct devrequest *cmd)
{
        void * data = buffer;
        int leni = transfer_len;
        int len = 0;
        int stat = 0;
        __u32 datab[4];
        __u8 *data_buf = (__u8 *)datab;
        __u16 bmRType_bReq;
        __u16 wValue;
        __u16 wIndex;
        __u16 wLength;

#ifdef DEBUG
urb_priv.actual_length = 0;
pkt_print(dev, pipe, buffer, transfer_len, cmd, "SUB(rh)", usb_pipein(pipe));
#endif
        if (usb_pipeint(pipe)) {
                info("Root-Hub submit IRQ: NOT implemented");
                return 0;
        }

        bmRType_bReq  = cmd->requesttype | (cmd->request << 8);
        wValue        = m16_swap (cmd->value);
        wIndex        = m16_swap (cmd->index);
        wLength       = m16_swap (cmd->length);

        info("Root-Hub: adr: %2x cmd(%1x): %08x %04x %04x %04x",
                dev->devnum, 8, bmRType_bReq, wValue, wIndex, wLength);

        switch (bmRType_bReq) {
        /* Request Destination:
           without flags: Device,
           RH_INTERFACE: interface,
           RH_ENDPOINT: endpoint,
           RH_CLASS means HUB here,
           RH_OTHER | RH_CLASS  almost ever means HUB_PORT here
        */

        case RH_GET_STATUS:
                        *(__u16 *) data_buf = m16_swap (1); OK (2);
        case RH_GET_STATUS | RH_INTERFACE:
                        *(__u16 *) data_buf = m16_swap (0); OK (2);
        case RH_GET_STATUS | RH_ENDPOINT:
                        *(__u16 *) data_buf = m16_swap (0); OK (2);
        case RH_GET_STATUS | RH_CLASS:
                        *(__u32 *) data_buf = m32_swap (
                                RD_RH_STAT & ~(RH_HS_CRWE | RH_HS_DRWE));
                        OK (4);
        case RH_GET_STATUS | RH_OTHER | RH_CLASS:
                        *(__u32 *) data_buf = m32_swap (RD_RH_PORTSTAT); OK (4);

        case RH_CLEAR_FEATURE | RH_ENDPOINT:
                switch (wValue) {
                        case (RH_ENDPOINT_STALL): OK (0);
                }
                break;

        case RH_CLEAR_FEATURE | RH_CLASS:
                switch (wValue) {
                        case RH_C_HUB_LOCAL_POWER:
                                OK(0);
                        case (RH_C_HUB_OVER_CURRENT):
                                        WR_RH_STAT(RH_HS_OCIC); OK (0);
                }
                break;

        case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
                switch (wValue) {
                        case (RH_PORT_ENABLE):
                                        WR_RH_PORTSTAT (RH_PS_CCS ); OK (0);
                        case (RH_PORT_SUSPEND):
                                        WR_RH_PORTSTAT (RH_PS_POCI); OK (0);
                        case (RH_PORT_POWER):
                                        WR_RH_PORTSTAT (RH_PS_LSDA); OK (0);
                        case (RH_C_PORT_CONNECTION):
                                        WR_RH_PORTSTAT (RH_PS_CSC ); OK (0);
                        case (RH_C_PORT_ENABLE):
                                        WR_RH_PORTSTAT (RH_PS_PESC); OK (0);
                        case (RH_C_PORT_SUSPEND):
                                        WR_RH_PORTSTAT (RH_PS_PSSC); OK (0);
                        case (RH_C_PORT_OVER_CURRENT):
                                        WR_RH_PORTSTAT (RH_PS_OCIC); OK (0);
                        case (RH_C_PORT_RESET):
                                        WR_RH_PORTSTAT (RH_PS_PRSC); OK (0);
                }
                break;

        case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
                switch (wValue) {
                        case (RH_PORT_SUSPEND):
                                        WR_RH_PORTSTAT (RH_PS_PSS ); OK (0);
                        case (RH_PORT_RESET): /* BUG IN HUP CODE *********/
                                        if (RD_RH_PORTSTAT & RH_PS_CCS)
                                            WR_RH_PORTSTAT (RH_PS_PRS);
                                        OK (0);
                        case (RH_PORT_POWER):
                                        WR_RH_PORTSTAT (RH_PS_PPS ); OK (0);
                        case (RH_PORT_ENABLE): /* BUG IN HUP CODE *********/
                                        if (RD_RH_PORTSTAT & RH_PS_CCS)
                                            WR_RH_PORTSTAT (RH_PS_PES );
                                        OK (0);
                }
                break;

        case RH_SET_ADDRESS: gohci.rh.devnum = wValue; OK(0);

        case RH_GET_DESCRIPTOR:
                switch ((wValue & 0xff00) >> 8) {
                        case (0x01): /* device descriptor */
                                len = min_t(unsigned int,

                                          leni,
                                          min_t(unsigned int,
                                              sizeof (root_hub_dev_des),
                                              wLength));
                                data_buf = root_hub_dev_des; OK(len);
                        case (0x02): /* configuration descriptor */
                                len = min_t(unsigned int,
                                          leni,
                                          min_t(unsigned int,
                                              sizeof (root_hub_config_des),
                                              wLength));
                                data_buf = root_hub_config_des; OK(len);
                        case (0x03): /* string descriptors */
                                if(wValue==0x0300) {
                                        len = min_t(unsigned int,
                                                  leni,
                                                  min_t(unsigned int,
                                                      sizeof (root_hub_str_index0),
                                                      wLength));
                                        data_buf = root_hub_str_index0;
                                        OK(len);
                                }
                                if(wValue==0x0301) {
                                        len = min_t(unsigned int,
                                                  leni,
                                                  min_t(unsigned int,
                                                      sizeof (root_hub_str_index1),
                                                      wLength));
                                        data_buf = root_hub_str_index1;
                                        OK(len);
                        }
                        default:
                                stat = USB_ST_STALLED;
                }
                break;

        case RH_GET_DESCRIPTOR | RH_CLASS:
            {
                    __u32 temp = roothub_a (&gohci);

                    data_buf [0] = 9;           /* min length; */
                    data_buf [1] = 0x29;
                    data_buf [2] = temp & RH_A_NDP;
                    data_buf [3] = 0;
                    if (temp & RH_A_PSM)        /* per-port power switching? */
                        data_buf [3] |= 0x1;
                    if (temp & RH_A_NOCP)       /* no overcurrent reporting? */
                        data_buf [3] |= 0x10;
                    else if (temp & RH_A_OCPM)  /* per-port overcurrent reporting? */
                        data_buf [3] |= 0x8;

                    /* corresponds to data_buf[4-7] */
                    datab [1] = 0;
                    data_buf [5] = (temp & RH_A_POTPGT) >> 24;
                    temp = roothub_b (&gohci);
                    data_buf [7] = temp & RH_B_DR;
                    if (data_buf [2] < 7) {
                        data_buf [8] = 0xff;
                    } else {
                        data_buf [0] += 2;
                        data_buf [8] = (temp & RH_B_DR) >> 8;
                        data_buf [10] = data_buf [9] = 0xff;
                    }

                    len = min_t(unsigned int, leni,
                              min_t(unsigned int, data_buf [0], wLength));
                    OK (len);
                }

        case RH_GET_CONFIGURATION:      *(__u8 *) data_buf = 0x01; OK (1);

        case RH_SET_CONFIGURATION:      WR_RH_STAT (0x10000); OK (0);

        default:
                dbg ("unsupported root hub command");
                stat = USB_ST_STALLED;
        }

#ifdef  DEBUG
        ohci_dump_roothub (&gohci, 1);
#endif

        len = min_t(int, len, leni);
        if (data != data_buf)
            memcpy (data, data_buf, len);
        dev->act_len = len;
        dev->status = stat;

#ifdef DEBUG
        if (transfer_len)
                urb_priv.actual_length = transfer_len;
        pkt_print(dev, pipe, buffer, transfer_len, cmd, "RET(rh)", 0/*usb_pipein(pipe)*/);
#endif

        return stat;
}

/*-------------------------------------------------------------------------*/

/* common code for handling submit messages - used for all but root hub */
/* accesses. */
int submit_common_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                int transfer_len, struct devrequest *setup, int interval)
{
        int stat = 0;
        int maxsize = usb_maxpacket(dev, pipe);
        int timeout;

        /* device pulled? Shortcut the action. */
        if (devgone == dev) {
                dev->status = USB_ST_CRC_ERR;
                return 0;
        }

#ifdef DEBUG
        urb_priv.actual_length = 0;
        pkt_print(dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe));
#endif
        if (!maxsize) {
                err("submit_common_message: pipesize for pipe %lx is zero",
                        pipe);
                return -1;
        }

        if (sohci_submit_job(dev, pipe, buffer, transfer_len, setup, interval) < 0) {
                err("sohci_submit_job failed");
                return -1;
        }

        /* allow more time for a BULK device to react - some are slow */
#define BULK_TO  5000   /* timeout in milliseconds */
        if (usb_pipebulk(pipe))
                timeout = BULK_TO;
        else
                timeout = 100;

        /* wait for it to complete */
        for (;;) {
                /* check whether the controller is done */
                stat = hc_interrupt();
                if (stat < 0) {
                        stat = USB_ST_CRC_ERR;
                        break;
                }

                /* NOTE: since we are not interrupt driven in U-Boot and always
                 * handle only one URB at a time, we cannot assume the
                 * transaction finished on the first successful return from
                 * hc_interrupt().. unless the flag for current URB is set,
                 * meaning that all TD's to/from device got actually
                 * transferred and processed. If the current URB is not
                 * finished we need to re-iterate this loop so as
                 * hc_interrupt() gets called again as there needs to be some
                 * more TD's to process still */
                if ((stat >= 0) && (stat != 0xff) && (urb_finished)) {
                        /* 0xff is returned for an SF-interrupt */
                        break;
                }

                if (--timeout) {
                        mdelay(1);
                        if (!urb_finished)
                                dbg("\%");

                } else {
                        err("CTL:TIMEOUT ");
                        dbg("submit_common_msg: TO status %x\n", stat);
                        stat = USB_ST_CRC_ERR;
                        urb_finished = 1;
                        break;
                }
        }
#if 0
        /* we got an Root Hub Status Change interrupt */
        if (got_rhsc) {
#ifdef DEBUG
                ohci_dump_roothub (&gohci, 1);
#endif
                got_rhsc = 0;
                /* abuse timeout */
                timeout = rh_check_port_status(&gohci);
                if (timeout >= 0) {
#if 0 /* this does nothing useful, but leave it here in case that changes */
                        /* the called routine adds 1 to the passed value */
                        usb_hub_port_connect_change(gohci.rh.dev, timeout - 1);
#endif
                        /*
                         * XXX
                         * This is potentially dangerous because it assumes
                         * that only one device is ever plugged in!
                         */
                        devgone = dev;
                }
        }
#endif

        dev->status = stat;
        dev->act_len = transfer_len;

#ifdef DEBUG
        pkt_print(dev, pipe, buffer, transfer_len, setup, "RET(ctlr)", usb_pipein(pipe));
#endif

        /* free TDs in urb_priv */
        urb_free_priv (&urb_priv);
        return 0;
}

/* submit routines called from usb.c */
int submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                int transfer_len)
{
        info("submit_bulk_msg");
        return submit_common_msg(dev, pipe, buffer, transfer_len, NULL, 0);
}

int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                int transfer_len, struct devrequest *setup)
{
        int maxsize = usb_maxpacket(dev, pipe);

        info("submit_control_msg");
#ifdef DEBUG
        urb_priv.actual_length = 0;
        pkt_print(dev, pipe, buffer, transfer_len, setup, "SUB", usb_pipein(pipe));
#endif
        if (!maxsize) {
                err("submit_control_message: pipesize for pipe %lx is zero",
                        pipe);
                return -1;
        }
        if (((pipe >> 8) & 0x7f) == gohci.rh.devnum) {
                gohci.rh.dev = dev;
                /* root hub - redirect */
                return ohci_submit_rh_msg(dev, pipe, buffer, transfer_len,
                        setup);
        }

        return submit_common_msg(dev, pipe, buffer, transfer_len, setup, 0);
}

int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                int transfer_len, int interval)
{
        info("submit_int_msg");
        return -1;
}

/*-------------------------------------------------------------------------*
 * HC functions
 *-------------------------------------------------------------------------*/

/* reset the HC and BUS */

static int hc_reset (ohci_t *ohci)
{
        int timeout = 30;
        int smm_timeout = 50; /* 0,5 sec */

        if (readl (&ohci->regs->control) & OHCI_CTRL_IR) { /* SMM owns the HC */
                writel (OHCI_OCR, &ohci->regs->cmdstatus); /* request ownership */
                info("USB HC TakeOver from SMM");
                while (readl (&ohci->regs->control) & OHCI_CTRL_IR) {
                        mdelay (10);
                        if (--smm_timeout == 0) {
                                err("USB HC TakeOver failed!");
                                return -1;
                        }
                }
        }

        /* Disable HC interrupts */
        writel (OHCI_INTR_MIE, &ohci->regs->intrdisable);

        dbg("USB HC reset_hc usb-%s: ctrl = 0x%X ;",
                ohci->slot_name,
                readl (&ohci->regs->control));

        /* Reset USB (needed by some controllers) */
        ohci->hc_control = 0;
        writel (ohci->hc_control, &ohci->regs->control);

        /* HC Reset requires max 10 us delay */
        writel (OHCI_HCR,  &ohci->regs->cmdstatus);
        while ((readl (&ohci->regs->cmdstatus) & OHCI_HCR) != 0) {
                if (--timeout == 0) {
                        err("USB HC reset timed out!");
                        return -1;
                }
                udelay (1);
        }
        return 0;
}

/*-------------------------------------------------------------------------*/

/* Start an OHCI controller, set the BUS operational
 * enable interrupts
 * connect the virtual root hub */

static int hc_start (ohci_t * ohci)
{
        __u32 mask;
        unsigned int fminterval;

        ohci->disabled = 1;

        /* Tell the controller where the control and bulk lists are
         * The lists are empty now. */

        writel (0, &ohci->regs->ed_controlhead);
        writel (0, &ohci->regs->ed_bulkhead);

        writel ((__u32)ohci->hcca, &ohci->regs->hcca); /* a reset clears this */

        fminterval = 0x2edf;
        writel ((fminterval * 9) / 10, &ohci->regs->periodicstart);
        fminterval |= ((((fminterval - 210) * 6) / 7) << 16);
        writel (fminterval, &ohci->regs->fminterval);
        writel (0x628, &ohci->regs->lsthresh);

        /* start controller operations */
        ohci->hc_control = OHCI_CONTROL_INIT | OHCI_USB_OPER;
        ohci->disabled = 0;
        writel (ohci->hc_control, &ohci->regs->control);

        /* disable all interrupts */
        mask = (OHCI_INTR_SO | OHCI_INTR_WDH | OHCI_INTR_SF | OHCI_INTR_RD |
                        OHCI_INTR_UE | OHCI_INTR_FNO | OHCI_INTR_RHSC |
                        OHCI_INTR_OC | OHCI_INTR_MIE);
        writel (mask, &ohci->regs->intrdisable);
        /* clear all interrupts */
        mask &= ~OHCI_INTR_MIE;
        writel (mask, &ohci->regs->intrstatus);
        /* Choose the interrupts we care about now  - but w/o MIE */
        mask = OHCI_INTR_RHSC | OHCI_INTR_UE | OHCI_INTR_WDH | OHCI_INTR_SO;
        writel (mask, &ohci->regs->intrenable);

#ifdef  OHCI_USE_NPS
        /* required for AMD-756 and some Mac platforms */
        writel ((roothub_a (ohci) | RH_A_NPS) & ~RH_A_PSM,
                &ohci->regs->roothub.a);
        writel (RH_HS_LPSC, &ohci->regs->roothub.status);
#endif  /* OHCI_USE_NPS */

        /* POTPGT delay is bits 24-31, in 2 ms units. */
        mdelay ((roothub_a (ohci) >> 23) & 0x1fe);

        /* connect the virtual root hub */
        ohci->rh.devnum = 0;

        return 0;
}

/*-------------------------------------------------------------------------*/

/* an interrupt happens */

static int
hc_interrupt (void)
{
        ohci_t *ohci = &gohci;
        struct ohci_regs *regs = ohci->regs;
        int ints;
        int stat = -1;

        if ((ohci->hcca->done_head != 0) &&
             !(ohci_cpu_to_le32(ohci->hcca->done_head) & 0x01)) {

                ints =  OHCI_INTR_WDH;

        } else if ((ints = readl (&regs->intrstatus)) == ~(u32)0) {
                ohci->disabled++;
                err ("%s device removed!", ohci->slot_name);
                return -1;

        } else if ((ints &= readl (&regs->intrenable)) == 0) {
                dbg("hc_interrupt: returning..\n");
                return 0xff;
        }

        /* dbg("Interrupt: %x frame: %x", ints, le16_to_cpu (ohci->hcca->frame_no)); */

        if (ints & OHCI_INTR_RHSC) {
                got_rhsc = 1;
                stat = 0xff;
        }

        if (ints & OHCI_INTR_UE) {
                ohci->disabled++;
                err ("OHCI Unrecoverable Error, controller usb-%s disabled",
                        ohci->slot_name);
                /* e.g. due to PCI Master/Target Abort */

#ifdef  DEBUG
                ohci_dump (ohci, 1);
#endif
                /* FIXME: be optimistic, hope that bug won't repeat often. */
                /* Make some non-interrupt context restart the controller. */
                /* Count and limit the retries though; either hardware or */
                /* software errors can go forever... */
                hc_reset (ohci);
                return -1;
        }

        if (ints & OHCI_INTR_WDH) {
                writel (OHCI_INTR_WDH, &regs->intrdisable);
                stat = dl_done_list (&gohci, dl_reverse_done_list (&gohci));
                writel (OHCI_INTR_WDH, &regs->intrenable);
        }

        if (ints & OHCI_INTR_SO) {
                dbg("USB Schedule overrun\n");
                writel (OHCI_INTR_SO, &regs->intrenable);
                stat = -1;
        }

        /* FIXME:  this assumes SOF (1/ms) interrupts don't get lost... */
        if (ints & OHCI_INTR_SF) {
                unsigned int frame = ohci_cpu_to_le16 (ohci->hcca->frame_no) & 1;
                mdelay(1);
                writel (OHCI_INTR_SF, &regs->intrdisable);
                if (ohci->ed_rm_list[frame] != NULL)
                        writel (OHCI_INTR_SF, &regs->intrenable);
                stat = 0xff;
        }

        writel (ints, &regs->intrstatus);
        return stat;
}

/*-------------------------------------------------------------------------*/

/*-------------------------------------------------------------------------*/

/* De-allocate all resources.. */

static void hc_release_ohci (ohci_t *ohci)
{
        dbg ("USB HC release ohci usb-%s", ohci->slot_name);

        if (!ohci->disabled)
                hc_reset (ohci);
}

/*-------------------------------------------------------------------------*/

/*
 * low level initalisation routine, called from usb.c
 */
static char ohci_inited = 0;

int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
{
        memset (&gohci, 0, sizeof (ohci_t));
        memset (&urb_priv, 0, sizeof (urb_priv_t));

        /* align the storage */
        if ((__u32)&ghcca[0] & 0xff) {
                err("HCCA not aligned!!");
                return -1;
        }
        phcca = &ghcca[0];
        info("aligned ghcca %p", phcca);
        memset(&ohci_dev, 0, sizeof(struct ohci_device));
        if ((__u32)&ohci_dev.ed[0] & 0x7) {
                err("EDs not aligned!!");
                return -1;
        }
        memset(gtd, 0, sizeof(td_t) * (NUM_TD + 1));
        if ((__u32)gtd & 0x7) {
                err("TDs not aligned!!");
                return -1;
        }
        ptd = gtd;
        gohci.hcca = phcca;
        memset (phcca, 0, sizeof (struct ohci_hcca));

        gohci.disabled = 1;
        gohci.sleeping = 0;
        gohci.irq = -1;
#if defined(CONFIG_440EP)
        gohci.regs = (struct ohci_regs *)(CONFIG_SYS_PERIPHERAL_BASE | 0x1000);
#elif defined(CONFIG_440EPX) || defined(CONFIG_SYS_USB_HOST)
        gohci.regs = (struct ohci_regs *)(CONFIG_SYS_USB_HOST);
#endif

        gohci.flags = 0;
        gohci.slot_name = "ppc440";

        if (hc_reset (&gohci) < 0) {
                hc_release_ohci (&gohci);
                return -1;
        }

        if (hc_start (&gohci) < 0) {
                err ("can't start usb-%s", gohci.slot_name);
                hc_release_ohci (&gohci);
                return -1;
        }

#ifdef  DEBUG
        ohci_dump (&gohci, 1);
#endif
        ohci_inited = 1;
        urb_finished = 1;

        return 0;
}

int usb_lowlevel_stop(int index)
{
        /* this gets called really early - before the controller has */
        /* even been initialized! */
        if (!ohci_inited)
                return 0;
        /* TODO release any interrupts, etc. */
        /* call hc_release_ohci() here ? */
        hc_reset (&gohci);
        return 0;
}

#endif /* CONFIG_USB_OHCI */