/*
 * Part of this code has been derived from linux:
 * Universal Host Controller Interface driver for USB (take II).
 *
 * (c) 1999-2001 Georg Acher, acher@in.tum.de (executive slave) (base guitar)
 *               Deti Fliegl, deti@fliegl.de (executive slave) (lead voice)
 *               Thomas Sailer, sailer@ife.ee.ethz.ch (chief consultant) (cheer leader)
 *               Roman Weissgaerber, weissg@vienna.at (virt root hub) (studio porter)
 * (c) 2000      Yggdrasil Computing, Inc. (port of new PCI interface support
 *               from usb-ohci.c by Adam Richter, adam@yggdrasil.com).
 * (C) 2000      David Brownell, david-b@pacbell.net (usb-ohci.c)
 *
 * HW-initalization based on material of
 *
 * (C) Copyright 1999 Linus Torvalds
 * (C) Copyright 1999 Johannes Erdfelt
 * (C) Copyright 1999 Randy Dunlap
 * (C) Copyright 1999 Gregory P. Smith
 *
 *
 * Adapted for U-Boot:
 * (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 * (C) Copyright 2008, Daniel Hellström, daniel@gaisler.com
 *     Added AMBA Plug&Play detection of GRUSB, modified interrupt handler.
 *     Added cache flushes where needed.
 *
 * SPDX-License-Identifier:     GPL-2.0+
 */

/**********************************************************************
 * How it works:
 * -------------
 * The framelist / Transfer descriptor / Queue Heads are similar like
 * in the linux usb_uhci.c.
 *
 * During initialization, the following skeleton is allocated in init_skel:
 *
 *         framespecific           |           common chain
 *
 * framelist[]
 * [  0 ]-----> TD ---------\
 * [  1 ]-----> TD ----------> TD ------> QH -------> QH -------> QH ---> NULL
 *   ...        TD ---------/
 * [1023]-----> TD --------/
 *
 *              ^^             ^^         ^^          ^^          ^^
 *              7 TDs for      1 TD for   Start of    Start of    End Chain
 *              INT (2-128ms)  1ms-INT    CTRL Chain  BULK Chain
 *
 *
 * Since this is a bootloader, the isochronous transfer descriptor have been removed.
 *
 * Interrupt Transfers.
 * --------------------
 * For Interrupt transfers USB_MAX_TEMP_INT_TD Transfer descriptor are available. They
 * will be inserted after the appropriate (depending the interval setting) skeleton TD.
 * If an interrupt has been detected the dev->irqhandler is called. The status and number
 * of transferred bytes is stored in dev->irq_status resp. dev->irq_act_len. If the
 * dev->irqhandler returns 0, the interrupt TD is removed and disabled. If an 1 is returned,
 * the interrupt TD will be reactivated.
 *
 * Control Transfers
 * -----------------
 * Control Transfers are issued by filling the tmp_td with the appropriate data and connect
 * them to the qh_cntrl queue header. Before other control/bulk transfers can be issued,
 * the programm has to wait for completion. This does not allows asynchronous data transfer.
 *
 * Bulk Transfers
 * --------------
 * Bulk Transfers are issued by filling the tmp_td with the appropriate data and connect
 * them to the qh_bulk queue header. Before other control/bulk transfers can be issued,
 * the programm has to wait for completion. This does not allows asynchronous data transfer.
 *
 *
 */

#include <common.h>
#include <ambapp.h>
#include <asm/leon.h>
#include <asm/leon3.h>
#include <asm/processor.h>

#ifdef CONFIG_USB_UHCI

#include <usb.h>
#include "usb_uhci.h"

DECLARE_GLOBAL_DATA_PTR;

#define USB_MAX_TEMP_TD      128        /* number of temporary TDs for bulk and control transfers */
#define USB_MAX_TEMP_INT_TD  32 /* number of temporary TDs for Interrupt transfers */

/*
#define out16r(address,data) (*(unsigned short *)(address) = \
 (unsigned short)( \
 (((unsigned short)(data)&0xff)<<8) | \
 (((unsigned short)(data)&0xff00)>>8) \
 ))
 */
#define out16r(address,data) _out16r((unsigned int)(address), (unsigned short)(data))
void _out16r(unsigned int address, unsigned short data)
{
        unsigned short val = (unsigned short)((((unsigned short)(data) & 0xff)
                                               << 8) | (((unsigned short)(data)
                                                         & 0xff00) >> 8));
#ifdef UHCI_DEBUG_REGS
        printf("out16r(0x%lx,0x%04x = 0x%04x)\n", address, val, data);
#endif
        *(unsigned short *)(address) = val;
}

#define out32r(address,data) _out32r((unsigned int)(address), (unsigned int)(data))
void _out32r(unsigned int address, unsigned int data)
{
        unsigned int val = (unsigned int)((((unsigned int)(data) & 0x000000ff)
                                           << 24) | (((unsigned int)(data) &
                                                      0x0000ff00) << 8) |
                                          (((unsigned int)(data) & 0x00ff0000)
                                           >> 8) | (((unsigned int)(data) &
                                                     0xff000000) >> 24));
#ifdef UHCI_DEBUG_REGS
        printf("out32r(0x%lx,0x%lx = 0x%lx)\n", address, val, data);
#endif
        *(unsigned int *)address = val;
}

#define in16r(address) _in16r((unsigned int)(address))
unsigned short _in16r(unsigned int address)
{
        unsigned short val = sparc_load_reg_cachemiss_word(address);
        val = ((val << 8) & 0xff00) | ((val >> 8) & 0xff);
#ifdef UHCI_DEBUG_REGS
        printf("in16r(0x%lx): 0x%04x\n", address, val);
#endif
        return val;
}

#define in32r(address) _in32r((unsigned int)(address))
unsigned int _in32r(unsigned int address)
{
        unsigned int val = sparc_load_reg_cachemiss(address);
        val =
            ((val << 24) & 0xff000000) | ((val << 8) & 0xff0000) | ((val >> 8) &
                                                                    0xff00) |
            ((val >> 24) & 0xff);
#ifdef UHCI_DEBUG_REGS
        printf("in32r(0x%lx): 0x%08x\n", address, val);
#endif
        return val;
}

#define READ32(address) sparc_load_reg_cachemiss((unsigned int)(address))

/*#define USB_UHCI_DEBUG*/
#undef USB_UHCI_DEBUG

void usb_show_td(int max);
#ifdef  USB_UHCI_DEBUG
void grusb_show_regs(void);
#define USB_UHCI_PRINTF(fmt,args...)    printf (fmt ,##args)
#else
#define USB_UHCI_PRINTF(fmt,args...)
#endif

static int grusb_irq = -1;      /* irq vector, if -1 uhci is stopped / reseted */
unsigned int usb_base_addr;     /* base address */

static uhci_td_t td_int[8] __attribute__ ((aligned(16)));       /* Interrupt Transfer descriptors */
static uhci_qh_t qh_cntrl __attribute__ ((aligned(16)));        /* control Queue Head */
static uhci_qh_t qh_bulk __attribute__ ((aligned(16))); /*  bulk Queue Head */
static uhci_qh_t qh_end __attribute__ ((aligned(16)));  /* end Queue Head */
static uhci_td_t td_last __attribute__ ((aligned(16))); /* last TD (linked with end chain) */

/* temporary tds */
static uhci_td_t tmp_td[USB_MAX_TEMP_TD] __attribute__ ((aligned(16))); /* temporary bulk/control td's  */
static uhci_td_t tmp_int_td[USB_MAX_TEMP_INT_TD] __attribute__ ((aligned(16))); /* temporary interrupt td's  */

static unsigned long framelist[1024] __attribute__ ((aligned(0x1000))); /* frame list */

static struct virt_root_hub rh; /* struct for root hub */

/**********************************************************************
 * some forward decleration
 */
int uhci_submit_rh_msg(struct usb_device *dev, unsigned long pipe,
                       void *buffer, int transfer_len,
                       struct devrequest *setup);

/* fill a td with the approproiate data. Link, status, info and buffer
 * are used by the USB controller itselfes, dev is used to identify the
 * "connected" device
 */
void usb_fill_td(uhci_td_t * td, unsigned long link, unsigned long status,
                 unsigned long info, unsigned long buffer, unsigned long dev)
{
        td->link = swap_32(link);
        td->status = swap_32(status);
        if ((info & UHCI_PID) == 0)
                info |= USB_PID_OUT;
        td->info = swap_32(info);
        td->buffer = swap_32(buffer);
        td->dev_ptr = dev;
}

/* fill a qh with the approproiate data. Head and element are used by the USB controller
 * itselfes. As soon as a valid dev_ptr is filled, a td chain is connected to the qh.
 * Please note, that after completion of the td chain, the entry element is removed /
 * marked invalid by the USB controller.
 */
void usb_fill_qh(uhci_qh_t * qh, unsigned long head, unsigned long element)
{
        qh->head = swap_32(head);
        qh->element = swap_32(element);
        qh->dev_ptr = 0L;
}

/* get the status of a td->status
 */
unsigned long usb_uhci_td_stat(unsigned long status)
{
        unsigned long result = 0;
        result |= (status & TD_CTRL_NAK) ? USB_ST_NAK_REC : 0;
        result |= (status & TD_CTRL_STALLED) ? USB_ST_STALLED : 0;
        result |= (status & TD_CTRL_DBUFERR) ? USB_ST_BUF_ERR : 0;
        result |= (status & TD_CTRL_BABBLE) ? USB_ST_BABBLE_DET : 0;
        result |= (status & TD_CTRL_CRCTIMEO) ? USB_ST_CRC_ERR : 0;
        result |= (status & TD_CTRL_BITSTUFF) ? USB_ST_BIT_ERR : 0;
        result |= (status & TD_CTRL_ACTIVE) ? USB_ST_NOT_PROC : 0;
        return result;
}

/* get the status and the transferred len of a td chain.
 * called from the completion handler
 */
int usb_get_td_status(uhci_td_t * td, struct usb_device *dev)
{
        unsigned long temp, info;
        unsigned long stat;
        uhci_td_t *mytd = td;

        if (dev->devnum == rh.devnum)
                return 0;
        dev->act_len = 0;
        stat = 0;
        do {
                temp = swap_32((unsigned long)READ32(&mytd->status));
                stat = usb_uhci_td_stat(temp);
                info = swap_32((unsigned long)READ32(&mytd->info));
                if (((info & 0xff) != USB_PID_SETUP) && (((info >> 21) & 0x7ff) != 0x7ff) && (temp & 0x7FF) != 0x7ff) { /* if not setup and not null data pack */
                        dev->act_len += (temp & 0x7FF) + 1;     /* the transferred len is act_len + 1 */
                }
                if (stat) {     /* status no ok */
                        dev->status = stat;
                        return -1;
                }
                temp = swap_32((unsigned long)READ32(&mytd->link));
                mytd = (uhci_td_t *) (temp & 0xfffffff0);
        } while ((temp & 0x1) == 0);    /* process all TDs */
        dev->status = stat;
        return 0;               /* Ok */
}

/*-------------------------------------------------------------------
 *                         LOW LEVEL STUFF
 *          assembles QHs und TDs for control, bulk and iso
 *-------------------------------------------------------------------*/
int dummy(void)
{
        USB_UHCI_PRINTF("DUMMY\n");
        return 0;
}

/* Submits a control message. That is a Setup, Data and Status transfer.
 * Routine does not wait for completion.
 */
int submit_control_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                       int transfer_len, struct devrequest *setup)
{
        unsigned long destination, status;
        int maxsze = usb_maxpacket(dev, pipe);
        unsigned long dataptr;
        int len;
        int pktsze;
        int i = 0;

        if (!maxsze) {
                USB_UHCI_PRINTF
                    ("uhci_submit_control_urb: pipesize for pipe %lx is zero\n",
                     pipe);
                return -1;
        }
        if (((pipe >> 8) & 0x7f) == rh.devnum) {
                /* this is the root hub -> redirect it */
                return uhci_submit_rh_msg(dev, pipe, buffer, transfer_len,
                                          setup);
        }
        USB_UHCI_PRINTF("uhci_submit_control start len %x, maxsize %x\n",
                        transfer_len, maxsze);
        /* The "pipe" thing contains the destination in bits 8--18 */
        destination = (pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP; /* Setup stage */
        /* 3 errors */
        status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | (3 << 27);
        /* (urb->transfer_flags & USB_DISABLE_SPD ? 0 : TD_CTRL_SPD); */
        /*  Build the TD for the control request, try forever, 8 bytes of data */
        usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status, destination | (7 << 21),
                    (unsigned long)setup, (unsigned long)dev);
#ifdef DEBUG_EXTRA
        {
                char *sp = (char *)setup;
                printf("SETUP to pipe %lx: %x %x %x %x %x %x %x %x\n", pipe,
                       sp[0], sp[1], sp[2], sp[3], sp[4], sp[5], sp[6], sp[7]);
        }
#endif
        dataptr = (unsigned long)buffer;
        len = transfer_len;

        /* If direction is "send", change the frame from SETUP (0x2D)
           to OUT (0xE1). Else change it from SETUP to IN (0x69). */
        destination =
            (pipe & PIPE_DEVEP_MASK) | ((pipe & USB_DIR_IN) ==
                                        0 ? USB_PID_OUT : USB_PID_IN);
        while (len > 0) {
                /* data stage */
                pktsze = len;
                i++;
                if (pktsze > maxsze)
                        pktsze = maxsze;
                destination ^= 1 << TD_TOKEN_TOGGLE;    /* toggle DATA0/1 */
                usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status, destination | ((pktsze - 1) << 21), dataptr, (unsigned long)dev);        /* Status, pktsze bytes of data */
                tmp_td[i - 1].link = swap_32((unsigned long)&tmp_td[i]);

                dataptr += pktsze;
                len -= pktsze;
        }

        /*  Build the final TD for control status */
        /* It's only IN if the pipe is out AND we aren't expecting data */

        destination &= ~UHCI_PID;
        if (((pipe & USB_DIR_IN) == 0) || (transfer_len == 0))
                destination |= USB_PID_IN;
        else
                destination |= USB_PID_OUT;
        destination |= 1 << TD_TOKEN_TOGGLE;    /* End in Data1 */
        i++;
        status &= ~TD_CTRL_SPD;
        /* no limit on errors on final packet , 0 bytes of data */
        usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status | TD_CTRL_IOC,
                    destination | (UHCI_NULL_DATA_SIZE << 21), 0,
                    (unsigned long)dev);
        tmp_td[i - 1].link = swap_32((unsigned long)&tmp_td[i]);        /* queue status td */
        /* usb_show_td(i+1); */
        USB_UHCI_PRINTF("uhci_submit_control end (%d tmp_tds used)\n", i);
        /* first mark the control QH element terminated */
        qh_cntrl.element = 0xffffffffL;
        /* set qh active */
        qh_cntrl.dev_ptr = (unsigned long)dev;
        /* fill in tmp_td_chain */
        dummy();
        qh_cntrl.element = swap_32((unsigned long)&tmp_td[0]);
        return 0;
}

/*-------------------------------------------------------------------
 * Prepare TDs for bulk transfers.
 */
int submit_bulk_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                    int transfer_len)
{
        unsigned long destination, status, info;
        unsigned long dataptr;
        int maxsze = usb_maxpacket(dev, pipe);
        int len;
        int i = 0;

        if (transfer_len < 0) {
                printf("Negative transfer length in submit_bulk\n");
                return -1;
        }
        if (!maxsze)
                return -1;
        /* The "pipe" thing contains the destination in bits 8--18. */
        destination = (pipe & PIPE_DEVEP_MASK) | usb_packetid(pipe);
        /* 3 errors */
        status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | (3 << 27);
        /*      ((urb->transfer_flags & USB_DISABLE_SPD) ? 0 : TD_CTRL_SPD) | (3 << 27); */
        /* Build the TDs for the bulk request */
        len = transfer_len;
        dataptr = (unsigned long)buffer;
        do {
                int pktsze = len;
                if (pktsze > maxsze)
                        pktsze = maxsze;
                /* pktsze bytes of data  */
                info =
                    destination | (((pktsze - 1) & UHCI_NULL_DATA_SIZE) << 21) |
                    (usb_gettoggle
                     (dev, usb_pipeendpoint(pipe),
                      usb_pipeout(pipe)) << TD_TOKEN_TOGGLE);

                if ((len - pktsze) == 0)
                        status |= TD_CTRL_IOC;  /* last one generates INT */

                usb_fill_td(&tmp_td[i], UHCI_PTR_TERM, status, info, dataptr, (unsigned long)dev);      /* Status, pktsze bytes of data */
                if (i > 0)
                        tmp_td[i - 1].link = swap_32((unsigned long)&tmp_td[i]);
                i++;
                dataptr += pktsze;
                len -= pktsze;
                usb_dotoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
        } while (len > 0);
        /* first mark the bulk QH element terminated */
        qh_bulk.element = 0xffffffffL;
        /* set qh active */
        qh_bulk.dev_ptr = (unsigned long)dev;
        /* fill in tmp_td_chain */
        qh_bulk.element = swap_32((unsigned long)&tmp_td[0]);
        return 0;
}

/* search a free interrupt td
 */
uhci_td_t *uhci_alloc_int_td(void)
{
        int i;
        for (i = 0; i < USB_MAX_TEMP_INT_TD; i++) {
                if (tmp_int_td[i].dev_ptr == 0) /* no device assigned -> free TD */
                        return &tmp_int_td[i];
        }
        return NULL;
}

/*-------------------------------------------------------------------
 * submits USB interrupt (ie. polling ;-)
 */
int submit_int_msg(struct usb_device *dev, unsigned long pipe, void *buffer,
                   int transfer_len, int interval)
{
        int nint, n;
        unsigned long status, destination;
        unsigned long info, tmp;
        uhci_td_t *mytd;
        if (interval < 0 || interval >= 256)
                return -1;

        if (interval == 0)
                nint = 0;
        else {
                for (nint = 0, n = 1; nint <= 8; nint++, n += n) {      /* round interval down to 2^n */
                        if (interval < n) {
                                interval = n / 2;
                                break;
                        }
                }
                nint--;
        }

        USB_UHCI_PRINTF("Rounded interval to %i, chain  %i\n", interval, nint);
        mytd = uhci_alloc_int_td();
        if (mytd == NULL) {
                printf("No free INT TDs found\n");
                return -1;
        }
        status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | TD_CTRL_IOC | (3 << 27);
/*              (urb->transfer_flags & USB_DISABLE_SPD ? 0 : TD_CTRL_SPD) | (3 << 27);
*/

        destination =
            (pipe & PIPE_DEVEP_MASK) | usb_packetid(pipe) |
            (((transfer_len - 1) & 0x7ff) << 21);

        info =
            destination |
            (usb_gettoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe)) <<
             TD_TOKEN_TOGGLE);
        tmp = swap_32(td_int[nint].link);
        usb_fill_td(mytd, tmp, status, info, (unsigned long)buffer,
                    (unsigned long)dev);
        /* Link it */
        tmp = swap_32((unsigned long)mytd);
        td_int[nint].link = tmp;

        usb_dotoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));

        return 0;
}

/**********************************************************************
 * Low Level functions
 */

void reset_hc(void)
{

        /* Global reset for 100ms */
        out16r(usb_base_addr + USBPORTSC1, 0x0204);
        out16r(usb_base_addr + USBPORTSC2, 0x0204);
        out16r(usb_base_addr + USBCMD, USBCMD_GRESET | USBCMD_RS);
        /* Turn off all interrupts */
        out16r(usb_base_addr + USBINTR, 0);
        mdelay(50);
        out16r(usb_base_addr + USBCMD, 0);
        mdelay(10);
}

void start_hc(void)
{
        int timeout = 1000;

        while (in16r(usb_base_addr + USBCMD) & USBCMD_HCRESET) {
                if (!--timeout) {
                        printf("USBCMD_HCRESET timed out!\n");
                        break;
                }
        }
        /* Turn on all interrupts */
        out16r(usb_base_addr + USBINTR,
               USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP);
        /* Start at frame 0 */
        out16r(usb_base_addr + USBFRNUM, 0);
        /* set Framebuffer base address */
        out32r(usb_base_addr + USBFLBASEADD, (unsigned long)&framelist);
        /* Run and mark it configured with a 64-byte max packet */
        out16r(usb_base_addr + USBCMD, USBCMD_RS | USBCMD_CF | USBCMD_MAXP);
}

/* Initialize the skeleton
 */
void usb_init_skel(void)
{
        unsigned long temp;
        int n;

        for (n = 0; n < USB_MAX_TEMP_INT_TD; n++)
                tmp_int_td[n].dev_ptr = 0L;     /* no devices connected */
        /* last td */
        usb_fill_td(&td_last, UHCI_PTR_TERM, TD_CTRL_IOC, USB_PID_OUT, 0, 0L);
        /* usb_fill_td(&td_last,UHCI_PTR_TERM,0,0,0); */
        /* End Queue Header */
        usb_fill_qh(&qh_end, UHCI_PTR_TERM, (unsigned long)&td_last);
        /* Bulk Queue Header */
        temp = (unsigned long)&qh_end;
        usb_fill_qh(&qh_bulk, temp | UHCI_PTR_QH, UHCI_PTR_TERM);
        /* Control Queue Header */
        temp = (unsigned long)&qh_bulk;
        usb_fill_qh(&qh_cntrl, temp | UHCI_PTR_QH, UHCI_PTR_TERM);
        /* 1ms Interrupt td */
        temp = (unsigned long)&qh_cntrl;
        usb_fill_td(&td_int[0], temp | UHCI_PTR_QH, 0, USB_PID_OUT, 0, 0L);
        temp = (unsigned long)&td_int[0];
        for (n = 1; n < 8; n++)
                usb_fill_td(&td_int[n], temp, 0, USB_PID_OUT, 0, 0L);
        for (n = 0; n < 1024; n++) {
                /* link all framelist pointers to one of the interrupts */
                int m, o;
                if ((n & 127) == 127)
                        framelist[n] = swap_32((unsigned long)&td_int[0]);
                else
                        for (o = 1, m = 2; m <= 128; o++, m += m)
                                if ((n & (m - 1)) == ((m - 1) / 2))
                                        framelist[n] =
                                            swap_32((unsigned long)&td_int[o]);

        }
}

/* check the common skeleton for completed transfers, and update the status
 * of the "connected" device. Called from the IRQ routine.
 */
void usb_check_skel(void)
{
        struct usb_device *dev;
        /* start with the control qh */
        if (qh_cntrl.dev_ptr != 0) {    /* it's a device assigned check if this caused IRQ */
                dev = (struct usb_device *)qh_cntrl.dev_ptr;
                /* Flush cache now that hardware updated DATA and TDs/QHs */
                if (!gd->arch.snooping_avail)
                        sparc_dcache_flush_all();
                usb_get_td_status(&tmp_td[0], dev);     /* update status */
                if (!(dev->status & USB_ST_NOT_PROC)) { /* is not active anymore, disconnect devices */
                        qh_cntrl.dev_ptr = 0;
                }
        }
        /* now process the bulk */
        if (qh_bulk.dev_ptr != 0) {     /* it's a device assigned check if this caused IRQ */
                dev = (struct usb_device *)qh_bulk.dev_ptr;
                /* Flush cache now that hardware updated DATA and TDs/QHs */
                if (!gd->arch.snooping_avail)
                        sparc_dcache_flush_all();
                usb_get_td_status(&tmp_td[0], dev);     /* update status */
                if (!(dev->status & USB_ST_NOT_PROC)) { /* is not active anymore, disconnect devices */
                        qh_bulk.dev_ptr = 0;
                }
        }
}

/* check the interrupt chain, ubdate the status of the appropriate device,
 * call the appropriate irqhandler and reactivate the TD if the irqhandler
 * returns with 1
 */
void usb_check_int_chain(void)
{
        int i, res;
        unsigned long link, status;
        struct usb_device *dev;
        uhci_td_t *td, *prevtd;

        for (i = 0; i < 8; i++) {
                prevtd = &td_int[i];    /* the first previous td is the skeleton td */
                link = swap_32(READ32(&td_int[i].link)) & 0xfffffff0;   /* next in chain */
                td = (uhci_td_t *) link;        /* assign it */
                /* all interrupt TDs are finally linked to the td_int[0].
                 * so we process all until we find the td_int[0].
                 * if int0 chain points to a QH, we're also done
                 */
                while (((i > 0) && (link != (unsigned long)&td_int[0])) ||
                       ((i == 0)
                        && !(swap_32(READ32(&td->link)) & UHCI_PTR_QH))) {
                        /* check if a device is assigned with this td */
                        status = swap_32(READ32(&td->status));
                        if ((td->dev_ptr != 0L) && !(status & TD_CTRL_ACTIVE)) {
                                /* td is not active and a device is assigned -> call irqhandler */
                                dev = (struct usb_device *)td->dev_ptr;
                                dev->irq_act_len = ((status & 0x7FF) == 0x7FF) ? 0 : (status & 0x7FF) + 1;      /* transferred length */
                                dev->irq_status = usb_uhci_td_stat(status);     /* get status */
                                res = dev->irq_handle(dev);     /* call irqhandler */
                                if (res == 1) {
                                        /* reactivate */
                                        status |= TD_CTRL_ACTIVE;
                                        td->status = swap_32(status);
                                        prevtd = td;    /* previous td = this td */
                                } else {
                                        prevtd->link = READ32(&td->link);       /* link previous td directly to the nex td -> unlinked */
                                        /* remove device pointer */
                                        td->dev_ptr = 0L;
                                }
                        }       /* if we call the irq handler */
                        link = swap_32(READ32(&td->link)) & 0xfffffff0; /* next in chain */
                        td = (uhci_td_t *) link;        /* assign it */
                }               /* process all td in this int chain */
        }                       /* next interrupt chain */
}

/* usb interrupt service routine.
 */
void handle_usb_interrupt(void)
{
        unsigned short status;
        static int error = 0;

        /*
         * Read the interrupt status, and write it back to clear the
         * interrupt cause
         */

        status = in16r(usb_base_addr + USBSTS);

        if (!status)            /* shared interrupt, not mine */
                return;
        if (status != 1) {
                /* remove host controller halted state */
                if ((status & (USBSTS_HCPE | USBSTS_HCH)) ==
                    (USBSTS_HCPE | USBSTS_HCH)) {
                        /* Stop due to bug in driver, or hardware */
                        out16r(usb_base_addr + USBSTS, status);
                        out16r(usb_base_addr + USBCMD,
                               USBCMD_HCRESET | USBCMD_GRESET);
                        printf
                            ("GRUSB: HW detected error(s) in USB Descriptors (STS: 0x%x)\n",
                             status);
                        usb_show_td(8);
                        return;
                } else if ((status & 0x20)
                           && ((in16r(usb_base_addr + USBCMD) & USBCMD_RS) ==
                               0)) {
                        if (error < 10) {
                                out16r(usb_base_addr + USBCMD,
                                       USBCMD_RS | in16r(usb_base_addr +
                                                         USBCMD));
                                error++;
                        }
                } else
                        error = 0;
        }
        usb_check_int_chain();  /* call interrupt handlers for int tds */
        usb_check_skel();       /* call completion handler for common transfer routines */
        out16r(usb_base_addr + USBSTS, status);
}

/* init uhci
 */
int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
{
        ambapp_ahbdev ahbdev;

        /* Find GRUSB core using AMBA Plug&Play information */
        if (ambapp_ahbslv_find(&ambapp_plb, VENDOR_GAISLER, GAISLER_UHCI,
                CONFIG_SYS_GRLIB_GRUSB_INDEX, &ahbdev) != 1) {
                printf("USB UHCI: Failed to find GRUSB controller\n");
                return -1;
        }
        usb_base_addr = ahbdev.address[0];
        grusb_irq = ahbdev.irq;
        /*
           usb_base_addr = 0xfffa0000;
           grusb_irq = 10;
         */
#ifdef USB_UHCI_DEBUG
        grusb_show_regs();
#endif
        memset(td_int, 0, sizeof(td_int));
        memset(tmp_td, 0, sizeof(tmp_td));
        memset(tmp_int_td, 0, sizeof(tmp_int_td));
        memset(&qh_cntrl, 0, sizeof(qh_cntrl));
        memset(&qh_end, 0, sizeof(qh_end));
        memset(&td_last, 0, sizeof(td_last));

        irq_free_handler(grusb_irq);
        USB_UHCI_PRINTF("GRUSB: at 0x%lx irq %d\n", usb_base_addr, grusb_irq);
        rh.devnum = 0;
        usb_init_skel();
        reset_hc();
        start_hc();
        irq_install_handler(grusb_irq,
                            (interrupt_handler_t *) handle_usb_interrupt, NULL);
        return 0;
}

/* stop uhci
 */
int usb_lowlevel_stop(int index)
{
        if (grusb_irq == -1)
                return 1;
        irq_free_handler(grusb_irq);
        reset_hc();
        grusb_irq = -1;
        return 0;
}

/*******************************************************************************************
 * Virtual Root Hub
 * Since the uhci does not have a real HUB, we simulate one ;-)
 */
#undef  USB_RH_DEBUG

#ifdef  USB_RH_DEBUG
#define USB_RH_PRINTF(fmt,args...)      printf (fmt ,##args)
static void usb_display_wValue(unsigned short wValue, unsigned short wIndex);
static void usb_display_Req(unsigned short req);
#else
#define USB_RH_PRINTF(fmt,args...)
static void usb_display_wValue(unsigned short wValue, unsigned short wIndex)
{
}
static void usb_display_Req(unsigned short req)
{
}
#endif

#define WANT_USB_ROOT_HUB_HUB_DES
#include <usbroothubdes.h>
#undef WANT_USB_ROOT_HUB_HUB_DES

/*
 * Root Hub Control Pipe (interrupt Pipes are not supported)
 */

int uhci_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 status = 0;
        int stat = 0;
        int i;

        unsigned short cstatus;

        unsigned short bmRType_bReq;
        unsigned short wValue;
        unsigned short wIndex;
        unsigned short wLength;

        if (usb_pipeint(pipe)) {
                printf("Root-Hub submit IRQ: NOT implemented\n");
                return 0;
        }
        bmRType_bReq = cmd->requesttype | cmd->request << 8;
        wValue = swap_16(cmd->value);
        wIndex = swap_16(cmd->index);
        wLength = swap_16(cmd->length);
        usb_display_Req(bmRType_bReq);
        for (i = 0; i < 8; i++)
                rh.c_p_r[i] = 0;
        USB_RH_PRINTF("Root-Hub: adr: %2x cmd(%1x): %02x%02x %04x %04x %04x\n",
                      dev->devnum, 8, cmd->requesttype, cmd->request, 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:
                *(unsigned short *)data = swap_16(1);
                len = 2;
                break;
        case RH_GET_STATUS | RH_INTERFACE:
                *(unsigned short *)data = swap_16(0);
                len = 2;
                break;
        case RH_GET_STATUS | RH_ENDPOINT:
                *(unsigned short *)data = swap_16(0);
                len = 2;
                break;
        case RH_GET_STATUS | RH_CLASS:
                *(unsigned long *)data = swap_32(0);
                len = 4;
                break;          /* hub power ** */
        case RH_GET_STATUS | RH_OTHER | RH_CLASS:

                status = in16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1));
                cstatus = ((status & USBPORTSC_CSC) >> (1 - 0)) |
                    ((status & USBPORTSC_PEC) >> (3 - 1)) |
                    (rh.c_p_r[wIndex - 1] << (0 + 4));
                status = (status & USBPORTSC_CCS) | ((status & USBPORTSC_PE) >> (2 - 1)) | ((status & USBPORTSC_SUSP) >> (12 - 2)) | ((status & USBPORTSC_PR) >> (9 - 4)) | (1 << 8) |  /* power on ** */
                    ((status & USBPORTSC_LSDA) << (-8 + 9));

                *(unsigned short *)data = swap_16(status);
                *(unsigned short *)(data + 2) = swap_16(cstatus);
                len = 4;
                break;
        case RH_CLEAR_FEATURE | RH_ENDPOINT:
                switch (wValue) {
                case (RH_ENDPOINT_STALL):
                        len = 0;
                        break;
                }
                break;

        case RH_CLEAR_FEATURE | RH_CLASS:
                switch (wValue) {
                case (RH_C_HUB_OVER_CURRENT):
                        len = 0;        /* hub power over current ** */
                        break;
                }
                break;

        case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
                usb_display_wValue(wValue, wIndex);
                switch (wValue) {
                case (RH_PORT_ENABLE):
                        status =
                            in16r(usb_base_addr + USBPORTSC1 +
                                  2 * (wIndex - 1));
                        status = (status & 0xfff5) & ~USBPORTSC_PE;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        len = 0;
                        break;
                case (RH_PORT_SUSPEND):
                        status =
                            in16r(usb_base_addr + USBPORTSC1 +
                                  2 * (wIndex - 1));
                        status = (status & 0xfff5) & ~USBPORTSC_SUSP;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        len = 0;
                        break;
                case (RH_PORT_POWER):
                        len = 0;        /* port power ** */
                        break;
                case (RH_C_PORT_CONNECTION):
                        status =
                            in16r(usb_base_addr + USBPORTSC1 +
                                  2 * (wIndex - 1));
                        status = (status & 0xfff5) | USBPORTSC_CSC;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        len = 0;
                        break;
                case (RH_C_PORT_ENABLE):
                        status =
                            in16r(usb_base_addr + USBPORTSC1 +
                                  2 * (wIndex - 1));
                        status = (status & 0xfff5) | USBPORTSC_PEC;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        len = 0;
                        break;
                case (RH_C_PORT_SUSPEND):
/*** WR_RH_PORTSTAT(RH_PS_PSSC); */
                        len = 0;
                        break;
                case (RH_C_PORT_OVER_CURRENT):
                        len = 0;
                        break;
                case (RH_C_PORT_RESET):
                        rh.c_p_r[wIndex - 1] = 0;
                        len = 0;
                        break;
                }
                break;
        case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
                usb_display_wValue(wValue, wIndex);
                switch (wValue) {
                case (RH_PORT_SUSPEND):
                        status =
                            in16r(usb_base_addr + USBPORTSC1 +
                                  2 * (wIndex - 1));
                        status = (status & 0xfff5) | USBPORTSC_SUSP;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        len = 0;
                        break;
                case (RH_PORT_RESET):
                        status =
                            in16r(usb_base_addr + USBPORTSC1 +
                                  2 * (wIndex - 1));
                        status = (status & 0xfff5) | USBPORTSC_PR;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        mdelay(10);
                        status = (status & 0xfff5) & ~USBPORTSC_PR;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        udelay(10);
                        status = (status & 0xfff5) | USBPORTSC_PE;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        mdelay(10);
                        status = (status & 0xfff5) | 0xa;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        len = 0;
                        break;
                case (RH_PORT_POWER):
                        len = 0;        /* port power ** */
                        break;
                case (RH_PORT_ENABLE):
                        status =
                            in16r(usb_base_addr + USBPORTSC1 +
                                  2 * (wIndex - 1));
                        status = (status & 0xfff5) | USBPORTSC_PE;
                        out16r(usb_base_addr + USBPORTSC1 + 2 * (wIndex - 1),
                               status);
                        len = 0;
                        break;
                }
                break;

        case RH_SET_ADDRESS:
                rh.devnum = wValue;
                len = 0;
                break;
        case RH_GET_DESCRIPTOR:
                switch ((wValue & 0xff00) >> 8) {
                case (0x01):    /* device descriptor */
                        i = sizeof(root_hub_config_des);
                        status = i > wLength ? wLength : i;
                        len = leni > status ? status : leni;
                        memcpy(data, root_hub_dev_des, len);
                        break;
                case (0x02):    /* configuration descriptor */
                        i = sizeof(root_hub_config_des);
                        status = i > wLength ? wLength : i;
                        len = leni > status ? status : leni;
                        memcpy(data, root_hub_config_des, len);
                        break;
                case (0x03):    /*string descriptors */
                        if (wValue == 0x0300) {
                                i = sizeof(root_hub_str_index0);
                                status = i > wLength ? wLength : i;
                                len = leni > status ? status : leni;
                                memcpy(data, root_hub_str_index0, len);
                                break;
                        }
                        if (wValue == 0x0301) {
                                i = sizeof(root_hub_str_index1);
                                status = i > wLength ? wLength : i;
                                len = leni > status ? status : leni;
                                memcpy(data, root_hub_str_index1, len);
                                break;
                        }
                        stat = USB_ST_STALLED;
                }
                break;

        case RH_GET_DESCRIPTOR | RH_CLASS:
                root_hub_hub_des[2] = 2;
                i = sizeof(root_hub_hub_des);
                status = i > wLength ? wLength : i;
                len = leni > status ? status : leni;
                memcpy(data, root_hub_hub_des, len);

                break;
        case RH_GET_CONFIGURATION:
                *(unsigned char *)data = 0x01;
                len = 1;
                break;
        case RH_SET_CONFIGURATION:
                len = 0;
                break;
        default:
                stat = USB_ST_STALLED;
        }
        USB_RH_PRINTF("Root-Hub stat %lx port1: %x port2: %x\n\n", stat,
                      in16r(usb_base_addr + USBPORTSC1),
                      in16r(usb_base_addr + USBPORTSC2));
        dev->act_len = len;
        dev->status = stat;
        return stat;

}

/********************************************************************************
 * Some Debug Routines
 */

#ifdef  USB_RH_DEBUG

static void usb_display_Req(unsigned short req)
{
        USB_RH_PRINTF("- Root-Hub Request: ");
        switch (req) {
        case RH_GET_STATUS:
                USB_RH_PRINTF("Get Status ");
                break;
        case RH_GET_STATUS | RH_INTERFACE:
                USB_RH_PRINTF("Get Status Interface ");
                break;
        case RH_GET_STATUS | RH_ENDPOINT:
                USB_RH_PRINTF("Get Status Endpoint ");
                break;
        case RH_GET_STATUS | RH_CLASS:
                USB_RH_PRINTF("Get Status Class");
                break;          /* hub power ** */
        case RH_GET_STATUS | RH_OTHER | RH_CLASS:
                USB_RH_PRINTF("Get Status Class Others");
                break;
        case RH_CLEAR_FEATURE | RH_ENDPOINT:
                USB_RH_PRINTF("Clear Feature Endpoint ");
                break;
        case RH_CLEAR_FEATURE | RH_CLASS:
                USB_RH_PRINTF("Clear Feature Class ");
                break;
        case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
                USB_RH_PRINTF("Clear Feature Other Class ");
                break;
        case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
                USB_RH_PRINTF("Set Feature Other Class ");
                break;
        case RH_SET_ADDRESS:
                USB_RH_PRINTF("Set Address ");
                break;
        case RH_GET_DESCRIPTOR:
                USB_RH_PRINTF("Get Descriptor ");
                break;
        case RH_GET_DESCRIPTOR | RH_CLASS:
                USB_RH_PRINTF("Get Descriptor Class ");
                break;
        case RH_GET_CONFIGURATION:
                USB_RH_PRINTF("Get Configuration ");
                break;
        case RH_SET_CONFIGURATION:
                USB_RH_PRINTF("Get Configuration ");
                break;
        default:
                USB_RH_PRINTF("****UNKNOWN**** 0x%04X ", req);
        }
        USB_RH_PRINTF("\n");

}

static void usb_display_wValue(unsigned short wValue, unsigned short wIndex)
{
        switch (wValue) {
        case (RH_PORT_ENABLE):
                USB_RH_PRINTF("Root-Hub: Enable Port %d\n", wIndex);
                break;
        case (RH_PORT_SUSPEND):
                USB_RH_PRINTF("Root-Hub: Suspend Port %d\n", wIndex);
                break;
        case (RH_PORT_POWER):
                USB_RH_PRINTF("Root-Hub: Port Power %d\n", wIndex);
                break;
        case (RH_C_PORT_CONNECTION):
                USB_RH_PRINTF("Root-Hub: C Port Connection Port %d\n", wIndex);
                break;
        case (RH_C_PORT_ENABLE):
                USB_RH_PRINTF("Root-Hub: C Port Enable Port %d\n", wIndex);
                break;
        case (RH_C_PORT_SUSPEND):
                USB_RH_PRINTF("Root-Hub: C Port Suspend Port %d\n", wIndex);
                break;
        case (RH_C_PORT_OVER_CURRENT):
                USB_RH_PRINTF("Root-Hub: C Port Over Current Port %d\n",
                              wIndex);
                break;
        case (RH_C_PORT_RESET):
                USB_RH_PRINTF("Root-Hub: C Port reset Port %d\n", wIndex);
                break;
        default:
                USB_RH_PRINTF("Root-Hub: unknown %x %x\n", wValue, wIndex);
                break;
        }
}

#endif

/*#ifdef        USB_UHCI_DEBUG*/

static int usb_display_td(uhci_td_t * td)
{
        unsigned long tmp;
        int valid;

        printf("TD at %p:\n", td);

        tmp = swap_32(READ32(&td->link));
        printf("Link points to 0x%08lX, %s first, %s, %s\n", tmp & 0xfffffff0,
               ((tmp & 0x4) == 0x4) ? "Depth" : "Breath",
               ((tmp & 0x2) == 0x2) ? "QH" : "TD",
               ((tmp & 0x1) == 0x1) ? "invalid" : "valid");
        valid = ((tmp & 0x1) == 0x0);
        tmp = swap_32(READ32(&td->status));
        printf
            ("     %s %ld Errors %s %s %s \n     %s %s %s %s %s %s\n     Len 0x%lX\n",
             (((tmp >> 29) & 0x1) == 0x1) ? "SPD Enable" : "SPD Disable",
             ((tmp >> 28) & 0x3),
             (((tmp >> 26) & 0x1) == 0x1) ? "Low Speed" : "Full Speed",
             (((tmp >> 25) & 0x1) == 0x1) ? "ISO " : "",
             (((tmp >> 24) & 0x1) == 0x1) ? "IOC " : "",
             (((tmp >> 23) & 0x1) == 0x1) ? "Active " : "Inactive ",
             (((tmp >> 22) & 0x1) == 0x1) ? "Stalled" : "",
             (((tmp >> 21) & 0x1) == 0x1) ? "Data Buffer Error" : "",
             (((tmp >> 20) & 0x1) == 0x1) ? "Babble" : "",
             (((tmp >> 19) & 0x1) == 0x1) ? "NAK" : "",
             (((tmp >> 18) & 0x1) == 0x1) ? "Bitstuff Error" : "",
             (tmp & 0x7ff));
        tmp = swap_32(READ32(&td->info));
        printf("     MaxLen 0x%lX\n", ((tmp >> 21) & 0x7FF));
        printf("     %sEndpoint 0x%lX Dev Addr 0x%lX PID 0x%lX\n",
               ((tmp >> 19) & 0x1) == 0x1 ? "TOGGLE " : "", ((tmp >> 15) & 0xF),
               ((tmp >> 8) & 0x7F), tmp & 0xFF);
        tmp = swap_32(READ32(&td->buffer));
        printf("     Buffer 0x%08lX\n", tmp);
        printf("     DEV %08lX\n", td->dev_ptr);
        return valid;
}

void usb_show_td(int max)
{
        int i;
        if (max > 0) {
                for (i = 0; i < max; i++) {
                        usb_display_td(&tmp_td[i]);
                }
        } else {
                i = 0;
                do {
                        printf("tmp_td[%d]\n", i);
                } while (usb_display_td(&tmp_td[i++]));
        }
}

void grusb_show_regs(void)
{
        unsigned int tmp;

        tmp = in16r(usb_base_addr + USBCMD);
        printf(" USBCMD:   0x%04x\n", tmp);
        tmp = in16r(usb_base_addr + USBSTS);
        printf(" USBSTS:   0x%04x\n", tmp);
        tmp = in16r(usb_base_addr + USBINTR);
        printf(" USBINTR:   0x%04x\n", tmp);
        tmp = in16r(usb_base_addr + USBFRNUM);
        printf(" FRNUM:   0x%04x\n", tmp);
        tmp = in32r(usb_base_addr + USBFLBASEADD);
        printf(" FLBASEADD:   0x%08x\n", tmp);
        tmp = in16r(usb_base_addr + USBSOF);
        printf(" SOFMOD:   0x%04x\n", tmp);
        tmp = in16r(usb_base_addr + USBPORTSC1);
        printf(" PORTSC1:   0x%04x\n", tmp);
}

/*#endif*/
#endif                          /* CONFIG_USB_UHCI */

/* EOF */