Fix block device accesses beyond 2TiB

[people/ms/u-boot.git] / common / usb_storage.c

/*
 * Most of this source has been derived from the Linux USB
 * project:
 *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
 *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
 *   (c) 1999 Michael Gee (michael@linuxspecific.com)
 *   (c) 2000 Yggdrasil Computing, Inc.
 *
 *
 * Adapted for U-Boot:
 *   (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 *
 * For BBB support (C) Copyright 2003
 * Gary Jennejohn, DENX Software Engineering <garyj@denx.de>
 *
 * BBB support based on /sys/dev/usb/umass.c from
 * FreeBSD.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

/* Note:
 * Currently only the CBI transport protocoll has been implemented, and it
 * is only tested with a TEAC USB Floppy. Other Massstorages with CBI or CB
 * transport protocoll may work as well.
 */
/*
 * New Note:
 * Support for USB Mass Storage Devices (BBB) has been added. It has
 * only been tested with USB memory sticks.
 */


#include <common.h>
#include <command.h>
#include <asm/byteorder.h>
#include <asm/processor.h>

#include <part.h>
#include <usb.h>

#undef BBB_COMDAT_TRACE
#undef BBB_XPORT_TRACE

#include <scsi.h>
/* direction table -- this indicates the direction of the data
 * transfer for each command code -- a 1 indicates input
 */
static const unsigned char us_direction[256/8] = {
        0x28, 0x81, 0x14, 0x14, 0x20, 0x01, 0x90, 0x77,
        0x0C, 0x20, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01,
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
#define US_DIRECTION(x) ((us_direction[x>>3] >> (x & 7)) & 1)

static ccb usb_ccb __attribute__((aligned(ARCH_DMA_MINALIGN)));

/*
 * CBI style
 */

#define US_CBI_ADSC             0

/*
 * BULK only
 */
#define US_BBB_RESET            0xff
#define US_BBB_GET_MAX_LUN      0xfe

/* Command Block Wrapper */
typedef struct {
        __u32           dCBWSignature;
#       define CBWSIGNATURE     0x43425355
        __u32           dCBWTag;
        __u32           dCBWDataTransferLength;
        __u8            bCBWFlags;
#       define CBWFLAGS_OUT     0x00
#       define CBWFLAGS_IN      0x80
        __u8            bCBWLUN;
        __u8            bCDBLength;
#       define CBWCDBLENGTH     16
        __u8            CBWCDB[CBWCDBLENGTH];
} umass_bbb_cbw_t;
#define UMASS_BBB_CBW_SIZE      31
static __u32 CBWTag;

/* Command Status Wrapper */
typedef struct {
        __u32           dCSWSignature;
#       define CSWSIGNATURE     0x53425355
        __u32           dCSWTag;
        __u32           dCSWDataResidue;
        __u8            bCSWStatus;
#       define CSWSTATUS_GOOD   0x0
#       define CSWSTATUS_FAILED 0x1
#       define CSWSTATUS_PHASE  0x2
} umass_bbb_csw_t;
#define UMASS_BBB_CSW_SIZE      13

#define USB_MAX_STOR_DEV 5
static int usb_max_devs; /* number of highest available usb device */

static block_dev_desc_t usb_dev_desc[USB_MAX_STOR_DEV];

struct us_data;
typedef int (*trans_cmnd)(ccb *cb, struct us_data *data);
typedef int (*trans_reset)(struct us_data *data);

struct us_data {
        struct usb_device *pusb_dev;     /* this usb_device */

        unsigned int    flags;                  /* from filter initially */
#       define USB_READY        (1 << 0)
        unsigned char   ifnum;                  /* interface number */
        unsigned char   ep_in;                  /* in endpoint */
        unsigned char   ep_out;                 /* out ....... */
        unsigned char   ep_int;                 /* interrupt . */
        unsigned char   subclass;               /* as in overview */
        unsigned char   protocol;               /* .............. */
        unsigned char   attention_done;         /* force attn on first cmd */
        unsigned short  ip_data;                /* interrupt data */
        int             action;                 /* what to do */
        int             ip_wanted;              /* needed */
        int             *irq_handle;            /* for USB int requests */
        unsigned int    irqpipe;                /* pipe for release_irq */
        unsigned char   irqmaxp;                /* max packed for irq Pipe */
        unsigned char   irqinterval;            /* Intervall for IRQ Pipe */
        ccb             *srb;                   /* current srb */
        trans_reset     transport_reset;        /* reset routine */
        trans_cmnd      transport;              /* transport routine */
};

#ifdef CONFIG_USB_EHCI
/*
 * The U-Boot EHCI driver can handle any transfer length as long as there is
 * enough free heap space left, but the SCSI READ(10) and WRITE(10) commands are
 * limited to 65535 blocks.
 */
#define USB_MAX_XFER_BLK        65535
#else
#define USB_MAX_XFER_BLK        20
#endif

static struct us_data usb_stor[USB_MAX_STOR_DEV];


#define USB_STOR_TRANSPORT_GOOD    0
#define USB_STOR_TRANSPORT_FAILED -1
#define USB_STOR_TRANSPORT_ERROR  -2

int usb_stor_get_info(struct usb_device *dev, struct us_data *us,
                      block_dev_desc_t *dev_desc);
int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,
                      struct us_data *ss);
unsigned long usb_stor_read(int device, lbaint_t blknr,
                            lbaint_t blkcnt, void *buffer);
unsigned long usb_stor_write(int device, lbaint_t blknr,
                             lbaint_t blkcnt, const void *buffer);
struct usb_device * usb_get_dev_index(int index);
void uhci_show_temp_int_td(void);

#ifdef CONFIG_PARTITIONS
block_dev_desc_t *usb_stor_get_dev(int index)
{
        return (index < usb_max_devs) ? &usb_dev_desc[index] : NULL;
}
#endif

static void usb_show_progress(void)
{
        debug(".");
}

/*******************************************************************************
 * show info on storage devices; 'usb start/init' must be invoked earlier
 * as we only retrieve structures populated during devices initialization
 */
int usb_stor_info(void)
{
        int i;

        if (usb_max_devs > 0) {
                for (i = 0; i < usb_max_devs; i++) {
                        printf("  Device %d: ", i);
                        dev_print(&usb_dev_desc[i]);
                }
                return 0;
        }

        printf("No storage devices, perhaps not 'usb start'ed..?\n");
        return 1;
}

static unsigned int usb_get_max_lun(struct us_data *us)
{
        int len;
        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, result, 1);
        len = usb_control_msg(us->pusb_dev,
                              usb_rcvctrlpipe(us->pusb_dev, 0),
                              US_BBB_GET_MAX_LUN,
                              USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,
                              0, us->ifnum,
                              result, sizeof(char),
                              USB_CNTL_TIMEOUT * 5);
        debug("Get Max LUN -> len = %i, result = %i\n", len, (int) *result);
        return (len > 0) ? *result : 0;
}

/*******************************************************************************
 * scan the usb and reports device info
 * to the user if mode = 1
 * returns current device or -1 if no
 */
int usb_stor_scan(int mode)
{
        unsigned char i;
        struct usb_device *dev;

        if (mode == 1)
                printf("       scanning usb for storage devices... ");

        usb_disable_asynch(1); /* asynch transfer not allowed */

        for (i = 0; i < USB_MAX_STOR_DEV; i++) {
                memset(&usb_dev_desc[i], 0, sizeof(block_dev_desc_t));
                usb_dev_desc[i].if_type = IF_TYPE_USB;
                usb_dev_desc[i].dev = i;
                usb_dev_desc[i].part_type = PART_TYPE_UNKNOWN;
                usb_dev_desc[i].target = 0xff;
                usb_dev_desc[i].type = DEV_TYPE_UNKNOWN;
                usb_dev_desc[i].block_read = usb_stor_read;
                usb_dev_desc[i].block_write = usb_stor_write;
        }

        usb_max_devs = 0;
        for (i = 0; i < USB_MAX_DEVICE; i++) {
                dev = usb_get_dev_index(i); /* get device */
                debug("i=%d\n", i);
                if (dev == NULL)
                        break; /* no more devices available */

                if (usb_storage_probe(dev, 0, &usb_stor[usb_max_devs])) {
                        /* OK, it's a storage device.  Iterate over its LUNs
                         * and populate `usb_dev_desc'.
                         */
                        int lun, max_lun, start = usb_max_devs;

                        max_lun = usb_get_max_lun(&usb_stor[usb_max_devs]);
                        for (lun = 0;
                             lun <= max_lun && usb_max_devs < USB_MAX_STOR_DEV;
                             lun++) {
                                usb_dev_desc[usb_max_devs].lun = lun;
                                if (usb_stor_get_info(dev, &usb_stor[start],
                                    &usb_dev_desc[usb_max_devs]) == 1) {
                                        usb_max_devs++;
                                }
                        }
                }
                /* if storage device */
                if (usb_max_devs == USB_MAX_STOR_DEV) {
                        printf("max USB Storage Device reached: %d stopping\n",
                                usb_max_devs);
                        break;
                }
        } /* for */

        usb_disable_asynch(0); /* asynch transfer allowed */
        printf("%d Storage Device(s) found\n", usb_max_devs);
        if (usb_max_devs > 0)
                return 0;
        return -1;
}

static int usb_stor_irq(struct usb_device *dev)
{
        struct us_data *us;
        us = (struct us_data *)dev->privptr;

        if (us->ip_wanted)
                us->ip_wanted = 0;
        return 0;
}


#ifdef  DEBUG

static void usb_show_srb(ccb *pccb)
{
        int i;
        printf("SRB: len %d datalen 0x%lX\n ", pccb->cmdlen, pccb->datalen);
        for (i = 0; i < 12; i++)
                printf("%02X ", pccb->cmd[i]);
        printf("\n");
}

static void display_int_status(unsigned long tmp)
{
        printf("Status: %s %s %s %s %s %s %s\n",
                (tmp & USB_ST_ACTIVE) ? "Active" : "",
                (tmp & USB_ST_STALLED) ? "Stalled" : "",
                (tmp & USB_ST_BUF_ERR) ? "Buffer Error" : "",
                (tmp & USB_ST_BABBLE_DET) ? "Babble Det" : "",
                (tmp & USB_ST_NAK_REC) ? "NAKed" : "",
                (tmp & USB_ST_CRC_ERR) ? "CRC Error" : "",
                (tmp & USB_ST_BIT_ERR) ? "Bitstuff Error" : "");
}
#endif
/***********************************************************************
 * Data transfer routines
 ***********************************************************************/

static int us_one_transfer(struct us_data *us, int pipe, char *buf, int length)
{
        int max_size;
        int this_xfer;
        int result;
        int partial;
        int maxtry;
        int stat;

        /* determine the maximum packet size for these transfers */
        max_size = usb_maxpacket(us->pusb_dev, pipe) * 16;

        /* while we have data left to transfer */
        while (length) {

                /* calculate how long this will be -- maximum or a remainder */
                this_xfer = length > max_size ? max_size : length;
                length -= this_xfer;

                /* setup the retry counter */
                maxtry = 10;

                /* set up the transfer loop */
                do {
                        /* transfer the data */
                        debug("Bulk xfer 0x%x(%d) try #%d\n",
                              (unsigned int)buf, this_xfer, 11 - maxtry);
                        result = usb_bulk_msg(us->pusb_dev, pipe, buf,
                                              this_xfer, &partial,
                                              USB_CNTL_TIMEOUT * 5);
                        debug("bulk_msg returned %d xferred %d/%d\n",
                              result, partial, this_xfer);
                        if (us->pusb_dev->status != 0) {
                                /* if we stall, we need to clear it before
                                 * we go on
                                 */
#ifdef DEBUG
                                display_int_status(us->pusb_dev->status);
#endif
                                if (us->pusb_dev->status & USB_ST_STALLED) {
                                        debug("stalled ->clearing endpoint" \
                                              "halt for pipe 0x%x\n", pipe);
                                        stat = us->pusb_dev->status;
                                        usb_clear_halt(us->pusb_dev, pipe);
                                        us->pusb_dev->status = stat;
                                        if (this_xfer == partial) {
                                                debug("bulk transferred" \
                                                      "with error %lX," \
                                                      " but data ok\n",
                                                      us->pusb_dev->status);
                                                return 0;
                                        }
                                        else
                                                return result;
                                }
                                if (us->pusb_dev->status & USB_ST_NAK_REC) {
                                        debug("Device NAKed bulk_msg\n");
                                        return result;
                                }
                                debug("bulk transferred with error");
                                if (this_xfer == partial) {
                                        debug(" %ld, but data ok\n",
                                              us->pusb_dev->status);
                                        return 0;
                                }
                                /* if our try counter reaches 0, bail out */
                                        debug(" %ld, data %d\n",
                                              us->pusb_dev->status, partial);
                                if (!maxtry--)
                                                return result;
                        }
                        /* update to show what data was transferred */
                        this_xfer -= partial;
                        buf += partial;
                        /* continue until this transfer is done */
                } while (this_xfer);
        }

        /* if we get here, we're done and successful */
        return 0;
}

static int usb_stor_BBB_reset(struct us_data *us)
{
        int result;
        unsigned int pipe;

        /*
         * Reset recovery (5.3.4 in Universal Serial Bus Mass Storage Class)
         *
         * For Reset Recovery the host shall issue in the following order:
         * a) a Bulk-Only Mass Storage Reset
         * b) a Clear Feature HALT to the Bulk-In endpoint
         * c) a Clear Feature HALT to the Bulk-Out endpoint
         *
         * This is done in 3 steps.
         *
         * If the reset doesn't succeed, the device should be port reset.
         *
         * This comment stolen from FreeBSD's /sys/dev/usb/umass.c.
         */
        debug("BBB_reset\n");
        result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev, 0),
                                 US_BBB_RESET,
                                 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                                 0, us->ifnum, NULL, 0, USB_CNTL_TIMEOUT * 5);

        if ((result < 0) && (us->pusb_dev->status & USB_ST_STALLED)) {
                debug("RESET:stall\n");
                return -1;
        }

        /* long wait for reset */
        mdelay(150);
        debug("BBB_reset result %d: status %lX reset\n",
              result, us->pusb_dev->status);
        pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
        result = usb_clear_halt(us->pusb_dev, pipe);
        /* long wait for reset */
        mdelay(150);
        debug("BBB_reset result %d: status %lX clearing IN endpoint\n",
              result, us->pusb_dev->status);
        /* long wait for reset */
        pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
        result = usb_clear_halt(us->pusb_dev, pipe);
        mdelay(150);
        debug("BBB_reset result %d: status %lX clearing OUT endpoint\n",
              result, us->pusb_dev->status);
        debug("BBB_reset done\n");
        return 0;
}

/* FIXME: this reset function doesn't really reset the port, and it
 * should. Actually it should probably do what it's doing here, and
 * reset the port physically
 */
static int usb_stor_CB_reset(struct us_data *us)
{
        unsigned char cmd[12];
        int result;

        debug("CB_reset\n");
        memset(cmd, 0xff, sizeof(cmd));
        cmd[0] = SCSI_SEND_DIAG;
        cmd[1] = 4;
        result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev, 0),
                                 US_CBI_ADSC,
                                 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                                 0, us->ifnum, cmd, sizeof(cmd),
                                 USB_CNTL_TIMEOUT * 5);

        /* long wait for reset */
        mdelay(1500);
        debug("CB_reset result %d: status %lX clearing endpoint halt\n",
              result, us->pusb_dev->status);
        usb_clear_halt(us->pusb_dev, usb_rcvbulkpipe(us->pusb_dev, us->ep_in));
        usb_clear_halt(us->pusb_dev, usb_rcvbulkpipe(us->pusb_dev, us->ep_out));

        debug("CB_reset done\n");
        return 0;
}

/*
 * Set up the command for a BBB device. Note that the actual SCSI
 * command is copied into cbw.CBWCDB.
 */
static int usb_stor_BBB_comdat(ccb *srb, struct us_data *us)
{
        int result;
        int actlen;
        int dir_in;
        unsigned int pipe;
        ALLOC_CACHE_ALIGN_BUFFER(umass_bbb_cbw_t, cbw, 1);

        dir_in = US_DIRECTION(srb->cmd[0]);

#ifdef BBB_COMDAT_TRACE
        printf("dir %d lun %d cmdlen %d cmd %p datalen %lu pdata %p\n",
                dir_in, srb->lun, srb->cmdlen, srb->cmd, srb->datalen,
                srb->pdata);
        if (srb->cmdlen) {
                for (result = 0; result < srb->cmdlen; result++)
                        printf("cmd[%d] %#x ", result, srb->cmd[result]);
                printf("\n");
        }
#endif
        /* sanity checks */
        if (!(srb->cmdlen <= CBWCDBLENGTH)) {
                debug("usb_stor_BBB_comdat:cmdlen too large\n");
                return -1;
        }

        /* always OUT to the ep */
        pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);

        cbw->dCBWSignature = cpu_to_le32(CBWSIGNATURE);
        cbw->dCBWTag = cpu_to_le32(CBWTag++);
        cbw->dCBWDataTransferLength = cpu_to_le32(srb->datalen);
        cbw->bCBWFlags = (dir_in ? CBWFLAGS_IN : CBWFLAGS_OUT);
        cbw->bCBWLUN = srb->lun;
        cbw->bCDBLength = srb->cmdlen;
        /* copy the command data into the CBW command data buffer */
        /* DST SRC LEN!!! */
        memcpy(cbw->CBWCDB, srb->cmd, srb->cmdlen);
        result = usb_bulk_msg(us->pusb_dev, pipe, cbw, UMASS_BBB_CBW_SIZE,
                              &actlen, USB_CNTL_TIMEOUT * 5);
        if (result < 0)
                debug("usb_stor_BBB_comdat:usb_bulk_msg error\n");
        return result;
}

/* FIXME: we also need a CBI_command which sets up the completion
 * interrupt, and waits for it
 */
static int usb_stor_CB_comdat(ccb *srb, struct us_data *us)
{
        int result = 0;
        int dir_in, retry;
        unsigned int pipe;
        unsigned long status;

        retry = 5;
        dir_in = US_DIRECTION(srb->cmd[0]);

        if (dir_in)
                pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
        else
                pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);

        while (retry--) {
                debug("CBI gets a command: Try %d\n", 5 - retry);
#ifdef DEBUG
                usb_show_srb(srb);
#endif
                /* let's send the command via the control pipe */
                result = usb_control_msg(us->pusb_dev,
                                         usb_sndctrlpipe(us->pusb_dev , 0),
                                         US_CBI_ADSC,
                                         USB_TYPE_CLASS | USB_RECIP_INTERFACE,
                                         0, us->ifnum,
                                         srb->cmd, srb->cmdlen,
                                         USB_CNTL_TIMEOUT * 5);
                debug("CB_transport: control msg returned %d, status %lX\n",
                      result, us->pusb_dev->status);
                /* check the return code for the command */
                if (result < 0) {
                        if (us->pusb_dev->status & USB_ST_STALLED) {
                                status = us->pusb_dev->status;
                                debug(" stall during command found," \
                                      " clear pipe\n");
                                usb_clear_halt(us->pusb_dev,
                                              usb_sndctrlpipe(us->pusb_dev, 0));
                                us->pusb_dev->status = status;
                        }
                        debug(" error during command %02X" \
                              " Stat = %lX\n", srb->cmd[0],
                              us->pusb_dev->status);
                        return result;
                }
                /* transfer the data payload for this command, if one exists*/

                debug("CB_transport: control msg returned %d," \
                      " direction is %s to go 0x%lx\n", result,
                      dir_in ? "IN" : "OUT", srb->datalen);
                if (srb->datalen) {
                        result = us_one_transfer(us, pipe, (char *)srb->pdata,
                                                 srb->datalen);
                        debug("CBI attempted to transfer data," \
                              " result is %d status %lX, len %d\n",
                              result, us->pusb_dev->status,
                                us->pusb_dev->act_len);
                        if (!(us->pusb_dev->status & USB_ST_NAK_REC))
                                break;
                } /* if (srb->datalen) */
                else
                        break;
        }
        /* return result */

        return result;
}


static int usb_stor_CBI_get_status(ccb *srb, struct us_data *us)
{
        int timeout;

        us->ip_wanted = 1;
        submit_int_msg(us->pusb_dev, us->irqpipe,
                        (void *) &us->ip_data, us->irqmaxp, us->irqinterval);
        timeout = 1000;
        while (timeout--) {
                if ((volatile int *) us->ip_wanted == NULL)
                        break;
                mdelay(10);
        }
        if (us->ip_wanted) {
                printf("        Did not get interrupt on CBI\n");
                us->ip_wanted = 0;
                return USB_STOR_TRANSPORT_ERROR;
        }
        debug("Got interrupt data 0x%x, transfered %d status 0x%lX\n",
              us->ip_data, us->pusb_dev->irq_act_len,
              us->pusb_dev->irq_status);
        /* UFI gives us ASC and ASCQ, like a request sense */
        if (us->subclass == US_SC_UFI) {
                if (srb->cmd[0] == SCSI_REQ_SENSE ||
                    srb->cmd[0] == SCSI_INQUIRY)
                        return USB_STOR_TRANSPORT_GOOD; /* Good */
                else if (us->ip_data)
                        return USB_STOR_TRANSPORT_FAILED;
                else
                        return USB_STOR_TRANSPORT_GOOD;
        }
        /* otherwise, we interpret the data normally */
        switch (us->ip_data) {
        case 0x0001:
                return USB_STOR_TRANSPORT_GOOD;
        case 0x0002:
                return USB_STOR_TRANSPORT_FAILED;
        default:
                return USB_STOR_TRANSPORT_ERROR;
        }                       /* switch */
        return USB_STOR_TRANSPORT_ERROR;
}

#define USB_TRANSPORT_UNKNOWN_RETRY 5
#define USB_TRANSPORT_NOT_READY_RETRY 10

/* clear a stall on an endpoint - special for BBB devices */
static int usb_stor_BBB_clear_endpt_stall(struct us_data *us, __u8 endpt)
{
        int result;

        /* ENDPOINT_HALT = 0, so set value to 0 */
        result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev, 0),
                                USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
                                0, endpt, NULL, 0, USB_CNTL_TIMEOUT * 5);
        return result;
}

static int usb_stor_BBB_transport(ccb *srb, struct us_data *us)
{
        int result, retry;
        int dir_in;
        int actlen, data_actlen;
        unsigned int pipe, pipein, pipeout;
        ALLOC_CACHE_ALIGN_BUFFER(umass_bbb_csw_t, csw, 1);
#ifdef BBB_XPORT_TRACE
        unsigned char *ptr;
        int index;
#endif

        dir_in = US_DIRECTION(srb->cmd[0]);

        /* COMMAND phase */
        debug("COMMAND phase\n");
        result = usb_stor_BBB_comdat(srb, us);
        if (result < 0) {
                debug("failed to send CBW status %ld\n",
                      us->pusb_dev->status);
                usb_stor_BBB_reset(us);
                return USB_STOR_TRANSPORT_FAILED;
        }
        if (!(us->flags & USB_READY))
                mdelay(5);
        pipein = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
        pipeout = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
        /* DATA phase + error handling */
        data_actlen = 0;
        /* no data, go immediately to the STATUS phase */
        if (srb->datalen == 0)
                goto st;
        debug("DATA phase\n");
        if (dir_in)
                pipe = pipein;
        else
                pipe = pipeout;
        result = usb_bulk_msg(us->pusb_dev, pipe, srb->pdata, srb->datalen,
                              &data_actlen, USB_CNTL_TIMEOUT * 5);
        /* special handling of STALL in DATA phase */
        if ((result < 0) && (us->pusb_dev->status & USB_ST_STALLED)) {
                debug("DATA:stall\n");
                /* clear the STALL on the endpoint */
                result = usb_stor_BBB_clear_endpt_stall(us,
                                        dir_in ? us->ep_in : us->ep_out);
                if (result >= 0)
                        /* continue on to STATUS phase */
                        goto st;
        }
        if (result < 0) {
                debug("usb_bulk_msg error status %ld\n",
                      us->pusb_dev->status);
                usb_stor_BBB_reset(us);
                return USB_STOR_TRANSPORT_FAILED;
        }
#ifdef BBB_XPORT_TRACE
        for (index = 0; index < data_actlen; index++)
                printf("pdata[%d] %#x ", index, srb->pdata[index]);
        printf("\n");
#endif
        /* STATUS phase + error handling */
st:
        retry = 0;
again:
        debug("STATUS phase\n");
        result = usb_bulk_msg(us->pusb_dev, pipein, csw, UMASS_BBB_CSW_SIZE,
                                &actlen, USB_CNTL_TIMEOUT*5);

        /* special handling of STALL in STATUS phase */
        if ((result < 0) && (retry < 1) &&
            (us->pusb_dev->status & USB_ST_STALLED)) {
                debug("STATUS:stall\n");
                /* clear the STALL on the endpoint */
                result = usb_stor_BBB_clear_endpt_stall(us, us->ep_in);
                if (result >= 0 && (retry++ < 1))
                        /* do a retry */
                        goto again;
        }
        if (result < 0) {
                debug("usb_bulk_msg error status %ld\n",
                      us->pusb_dev->status);
                usb_stor_BBB_reset(us);
                return USB_STOR_TRANSPORT_FAILED;
        }
#ifdef BBB_XPORT_TRACE
        ptr = (unsigned char *)csw;
        for (index = 0; index < UMASS_BBB_CSW_SIZE; index++)
                printf("ptr[%d] %#x ", index, ptr[index]);
        printf("\n");
#endif
        /* misuse pipe to get the residue */
        pipe = le32_to_cpu(csw->dCSWDataResidue);
        if (pipe == 0 && srb->datalen != 0 && srb->datalen - data_actlen != 0)
                pipe = srb->datalen - data_actlen;
        if (CSWSIGNATURE != le32_to_cpu(csw->dCSWSignature)) {
                debug("!CSWSIGNATURE\n");
                usb_stor_BBB_reset(us);
                return USB_STOR_TRANSPORT_FAILED;
        } else if ((CBWTag - 1) != le32_to_cpu(csw->dCSWTag)) {
                debug("!Tag\n");
                usb_stor_BBB_reset(us);
                return USB_STOR_TRANSPORT_FAILED;
        } else if (csw->bCSWStatus > CSWSTATUS_PHASE) {
                debug(">PHASE\n");
                usb_stor_BBB_reset(us);
                return USB_STOR_TRANSPORT_FAILED;
        } else if (csw->bCSWStatus == CSWSTATUS_PHASE) {
                debug("=PHASE\n");
                usb_stor_BBB_reset(us);
                return USB_STOR_TRANSPORT_FAILED;
        } else if (data_actlen > srb->datalen) {
                debug("transferred %dB instead of %ldB\n",
                      data_actlen, srb->datalen);
                return USB_STOR_TRANSPORT_FAILED;
        } else if (csw->bCSWStatus == CSWSTATUS_FAILED) {
                debug("FAILED\n");
                return USB_STOR_TRANSPORT_FAILED;
        }

        return result;
}

static int usb_stor_CB_transport(ccb *srb, struct us_data *us)
{
        int result, status;
        ccb *psrb;
        ccb reqsrb;
        int retry, notready;

        psrb = &reqsrb;
        status = USB_STOR_TRANSPORT_GOOD;
        retry = 0;
        notready = 0;
        /* issue the command */
do_retry:
        result = usb_stor_CB_comdat(srb, us);
        debug("command / Data returned %d, status %lX\n",
              result, us->pusb_dev->status);
        /* if this is an CBI Protocol, get IRQ */
        if (us->protocol == US_PR_CBI) {
                status = usb_stor_CBI_get_status(srb, us);
                /* if the status is error, report it */
                if (status == USB_STOR_TRANSPORT_ERROR) {
                        debug(" USB CBI Command Error\n");
                        return status;
                }
                srb->sense_buf[12] = (unsigned char)(us->ip_data >> 8);
                srb->sense_buf[13] = (unsigned char)(us->ip_data & 0xff);
                if (!us->ip_data) {
                        /* if the status is good, report it */
                        if (status == USB_STOR_TRANSPORT_GOOD) {
                                debug(" USB CBI Command Good\n");
                                return status;
                        }
                }
        }
        /* do we have to issue an auto request? */
        /* HERE we have to check the result */
        if ((result < 0) && !(us->pusb_dev->status & USB_ST_STALLED)) {
                debug("ERROR %lX\n", us->pusb_dev->status);
                us->transport_reset(us);
                return USB_STOR_TRANSPORT_ERROR;
        }
        if ((us->protocol == US_PR_CBI) &&
            ((srb->cmd[0] == SCSI_REQ_SENSE) ||
            (srb->cmd[0] == SCSI_INQUIRY))) {
                /* do not issue an autorequest after request sense */
                debug("No auto request and good\n");
                return USB_STOR_TRANSPORT_GOOD;
        }
        /* issue an request_sense */
        memset(&psrb->cmd[0], 0, 12);
        psrb->cmd[0] = SCSI_REQ_SENSE;
        psrb->cmd[1] = srb->lun << 5;
        psrb->cmd[4] = 18;
        psrb->datalen = 18;
        psrb->pdata = &srb->sense_buf[0];
        psrb->cmdlen = 12;
        /* issue the command */
        result = usb_stor_CB_comdat(psrb, us);
        debug("auto request returned %d\n", result);
        /* if this is an CBI Protocol, get IRQ */
        if (us->protocol == US_PR_CBI)
                status = usb_stor_CBI_get_status(psrb, us);

        if ((result < 0) && !(us->pusb_dev->status & USB_ST_STALLED)) {
                debug(" AUTO REQUEST ERROR %ld\n",
                      us->pusb_dev->status);
                return USB_STOR_TRANSPORT_ERROR;
        }
        debug("autorequest returned 0x%02X 0x%02X 0x%02X 0x%02X\n",
              srb->sense_buf[0], srb->sense_buf[2],
              srb->sense_buf[12], srb->sense_buf[13]);
        /* Check the auto request result */
        if ((srb->sense_buf[2] == 0) &&
            (srb->sense_buf[12] == 0) &&
            (srb->sense_buf[13] == 0)) {
                /* ok, no sense */
                return USB_STOR_TRANSPORT_GOOD;
        }

        /* Check the auto request result */
        switch (srb->sense_buf[2]) {
        case 0x01:
                /* Recovered Error */
                return USB_STOR_TRANSPORT_GOOD;
                break;
        case 0x02:
                /* Not Ready */
                if (notready++ > USB_TRANSPORT_NOT_READY_RETRY) {
                        printf("cmd 0x%02X returned 0x%02X 0x%02X 0x%02X"
                               " 0x%02X (NOT READY)\n", srb->cmd[0],
                                srb->sense_buf[0], srb->sense_buf[2],
                                srb->sense_buf[12], srb->sense_buf[13]);
                        return USB_STOR_TRANSPORT_FAILED;
                } else {
                        mdelay(100);
                        goto do_retry;
                }
                break;
        default:
                if (retry++ > USB_TRANSPORT_UNKNOWN_RETRY) {
                        printf("cmd 0x%02X returned 0x%02X 0x%02X 0x%02X"
                               " 0x%02X\n", srb->cmd[0], srb->sense_buf[0],
                                srb->sense_buf[2], srb->sense_buf[12],
                                srb->sense_buf[13]);
                        return USB_STOR_TRANSPORT_FAILED;
                } else
                        goto do_retry;
                break;
        }
        return USB_STOR_TRANSPORT_FAILED;
}


static int usb_inquiry(ccb *srb, struct us_data *ss)
{
        int retry, i;
        retry = 5;
        do {
                memset(&srb->cmd[0], 0, 12);
                srb->cmd[0] = SCSI_INQUIRY;
                srb->cmd[1] = srb->lun << 5;
                srb->cmd[4] = 36;
                srb->datalen = 36;
                srb->cmdlen = 12;
                i = ss->transport(srb, ss);
                debug("inquiry returns %d\n", i);
                if (i == 0)
                        break;
        } while (--retry);

        if (!retry) {
                printf("error in inquiry\n");
                return -1;
        }
        return 0;
}

static int usb_request_sense(ccb *srb, struct us_data *ss)
{
        char *ptr;

        ptr = (char *)srb->pdata;
        memset(&srb->cmd[0], 0, 12);
        srb->cmd[0] = SCSI_REQ_SENSE;
        srb->cmd[1] = srb->lun << 5;
        srb->cmd[4] = 18;
        srb->datalen = 18;
        srb->pdata = &srb->sense_buf[0];
        srb->cmdlen = 12;
        ss->transport(srb, ss);
        debug("Request Sense returned %02X %02X %02X\n",
              srb->sense_buf[2], srb->sense_buf[12],
              srb->sense_buf[13]);
        srb->pdata = (uchar *)ptr;
        return 0;
}

static int usb_test_unit_ready(ccb *srb, struct us_data *ss)
{
        int retries = 10;

        do {
                memset(&srb->cmd[0], 0, 12);
                srb->cmd[0] = SCSI_TST_U_RDY;
                srb->cmd[1] = srb->lun << 5;
                srb->datalen = 0;
                srb->cmdlen = 12;
                if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD) {
                        ss->flags |= USB_READY;
                        return 0;
                }
                usb_request_sense(srb, ss);
                /*
                 * Check the Key Code Qualifier, if it matches
                 * "Not Ready - medium not present"
                 * (the sense Key equals 0x2 and the ASC is 0x3a)
                 * return immediately as the medium being absent won't change
                 * unless there is a user action.
                 */
                if ((srb->sense_buf[2] == 0x02) &&
                    (srb->sense_buf[12] == 0x3a))
                        return -1;
                mdelay(100);
        } while (retries--);

        return -1;
}

static int usb_read_capacity(ccb *srb, struct us_data *ss)
{
        int retry;
        /* XXX retries */
        retry = 3;
        do {
                memset(&srb->cmd[0], 0, 12);
                srb->cmd[0] = SCSI_RD_CAPAC;
                srb->cmd[1] = srb->lun << 5;
                srb->datalen = 8;
                srb->cmdlen = 12;
                if (ss->transport(srb, ss) == USB_STOR_TRANSPORT_GOOD)
                        return 0;
        } while (retry--);

        return -1;
}

static int usb_read_10(ccb *srb, struct us_data *ss, unsigned long start,
                       unsigned short blocks)
{
        memset(&srb->cmd[0], 0, 12);
        srb->cmd[0] = SCSI_READ10;
        srb->cmd[1] = srb->lun << 5;
        srb->cmd[2] = ((unsigned char) (start >> 24)) & 0xff;
        srb->cmd[3] = ((unsigned char) (start >> 16)) & 0xff;
        srb->cmd[4] = ((unsigned char) (start >> 8)) & 0xff;
        srb->cmd[5] = ((unsigned char) (start)) & 0xff;
        srb->cmd[7] = ((unsigned char) (blocks >> 8)) & 0xff;
        srb->cmd[8] = (unsigned char) blocks & 0xff;
        srb->cmdlen = 12;
        debug("read10: start %lx blocks %x\n", start, blocks);
        return ss->transport(srb, ss);
}

static int usb_write_10(ccb *srb, struct us_data *ss, unsigned long start,
                        unsigned short blocks)
{
        memset(&srb->cmd[0], 0, 12);
        srb->cmd[0] = SCSI_WRITE10;
        srb->cmd[1] = srb->lun << 5;
        srb->cmd[2] = ((unsigned char) (start >> 24)) & 0xff;
        srb->cmd[3] = ((unsigned char) (start >> 16)) & 0xff;
        srb->cmd[4] = ((unsigned char) (start >> 8)) & 0xff;
        srb->cmd[5] = ((unsigned char) (start)) & 0xff;
        srb->cmd[7] = ((unsigned char) (blocks >> 8)) & 0xff;
        srb->cmd[8] = (unsigned char) blocks & 0xff;
        srb->cmdlen = 12;
        debug("write10: start %lx blocks %x\n", start, blocks);
        return ss->transport(srb, ss);
}


#ifdef CONFIG_USB_BIN_FIXUP
/*
 * Some USB storage devices queried for SCSI identification data respond with
 * binary strings, which if output to the console freeze the terminal. The
 * workaround is to modify the vendor and product strings read from such
 * device with proper values (as reported by 'usb info').
 *
 * Vendor and product length limits are taken from the definition of
 * block_dev_desc_t in include/part.h.
 */
static void usb_bin_fixup(struct usb_device_descriptor descriptor,
                                unsigned char vendor[],
                                unsigned char product[]) {
        const unsigned char max_vendor_len = 40;
        const unsigned char max_product_len = 20;
        if (descriptor.idVendor == 0x0424 && descriptor.idProduct == 0x223a) {
                strncpy((char *)vendor, "SMSC", max_vendor_len);
                strncpy((char *)product, "Flash Media Cntrller",
                        max_product_len);
        }
}
#endif /* CONFIG_USB_BIN_FIXUP */

unsigned long usb_stor_read(int device, lbaint_t blknr,
                            lbaint_t blkcnt, void *buffer)
{
        lbaint_t start, blks;
        uintptr_t buf_addr;
        unsigned short smallblks;
        struct usb_device *dev;
        struct us_data *ss;
        int retry, i;
        ccb *srb = &usb_ccb;

        if (blkcnt == 0)
                return 0;

        device &= 0xff;
        /* Setup  device */
        debug("\nusb_read: dev %d \n", device);
        dev = NULL;
        for (i = 0; i < USB_MAX_DEVICE; i++) {
                dev = usb_get_dev_index(i);
                if (dev == NULL)
                        return 0;
                if (dev->devnum == usb_dev_desc[device].target)
                        break;
        }
        ss = (struct us_data *)dev->privptr;

        usb_disable_asynch(1); /* asynch transfer not allowed */
        srb->lun = usb_dev_desc[device].lun;
        buf_addr = (unsigned long)buffer;
        start = blknr;
        blks = blkcnt;

        debug("\nusb_read: dev %d startblk " LBAF ", blccnt " LBAF
              " buffer %lx\n", device, start, blks, buf_addr);

        do {
                /* XXX need some comment here */
                retry = 2;
                srb->pdata = (unsigned char *)buf_addr;
                if (blks > USB_MAX_XFER_BLK)
                        smallblks = USB_MAX_XFER_BLK;
                else
                        smallblks = (unsigned short) blks;
retry_it:
                if (smallblks == USB_MAX_XFER_BLK)
                        usb_show_progress();
                srb->datalen = usb_dev_desc[device].blksz * smallblks;
                srb->pdata = (unsigned char *)buf_addr;
                if (usb_read_10(srb, ss, start, smallblks)) {
                        debug("Read ERROR\n");
                        usb_request_sense(srb, ss);
                        if (retry--)
                                goto retry_it;
                        blkcnt -= blks;
                        break;
                }
                start += smallblks;
                blks -= smallblks;
                buf_addr += srb->datalen;
        } while (blks != 0);
        ss->flags &= ~USB_READY;

        debug("usb_read: end startblk " LBAF
              ", blccnt %x buffer %lx\n",
              start, smallblks, buf_addr);

        usb_disable_asynch(0); /* asynch transfer allowed */
        if (blkcnt >= USB_MAX_XFER_BLK)
                debug("\n");
        return blkcnt;
}

unsigned long usb_stor_write(int device, lbaint_t blknr,
                                lbaint_t blkcnt, const void *buffer)
{
        lbaint_t start, blks;
        uintptr_t buf_addr;
        unsigned short smallblks;
        struct usb_device *dev;
        struct us_data *ss;
        int retry, i;
        ccb *srb = &usb_ccb;

        if (blkcnt == 0)
                return 0;

        device &= 0xff;
        /* Setup  device */
        debug("\nusb_write: dev %d \n", device);
        dev = NULL;
        for (i = 0; i < USB_MAX_DEVICE; i++) {
                dev = usb_get_dev_index(i);
                if (dev == NULL)
                        return 0;
                if (dev->devnum == usb_dev_desc[device].target)
                        break;
        }
        ss = (struct us_data *)dev->privptr;

        usb_disable_asynch(1); /* asynch transfer not allowed */

        srb->lun = usb_dev_desc[device].lun;
        buf_addr = (unsigned long)buffer;
        start = blknr;
        blks = blkcnt;

        debug("\nusb_write: dev %d startblk " LBAF ", blccnt " LBAF
              " buffer %lx\n", device, start, blks, buf_addr);

        do {
                /* If write fails retry for max retry count else
                 * return with number of blocks written successfully.
                 */
                retry = 2;
                srb->pdata = (unsigned char *)buf_addr;
                if (blks > USB_MAX_XFER_BLK)
                        smallblks = USB_MAX_XFER_BLK;
                else
                        smallblks = (unsigned short) blks;
retry_it:
                if (smallblks == USB_MAX_XFER_BLK)
                        usb_show_progress();
                srb->datalen = usb_dev_desc[device].blksz * smallblks;
                srb->pdata = (unsigned char *)buf_addr;
                if (usb_write_10(srb, ss, start, smallblks)) {
                        debug("Write ERROR\n");
                        usb_request_sense(srb, ss);
                        if (retry--)
                                goto retry_it;
                        blkcnt -= blks;
                        break;
                }
                start += smallblks;
                blks -= smallblks;
                buf_addr += srb->datalen;
        } while (blks != 0);
        ss->flags &= ~USB_READY;

        debug("usb_write: end startblk " LBAF ", blccnt %x buffer %lx\n",
              start, smallblks, buf_addr);

        usb_disable_asynch(0); /* asynch transfer allowed */
        if (blkcnt >= USB_MAX_XFER_BLK)
                debug("\n");
        return blkcnt;

}

/* Probe to see if a new device is actually a Storage device */
int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,
                      struct us_data *ss)
{
        struct usb_interface *iface;
        int i;
        struct usb_endpoint_descriptor *ep_desc;
        unsigned int flags = 0;

        int protocol = 0;
        int subclass = 0;

        /* let's examine the device now */
        iface = &dev->config.if_desc[ifnum];

#if 0
        /* this is the place to patch some storage devices */
        debug("iVendor %X iProduct %X\n", dev->descriptor.idVendor,
                        dev->descriptor.idProduct);

        if ((dev->descriptor.idVendor) == 0x066b &&
            (dev->descriptor.idProduct) == 0x0103) {
                debug("patched for E-USB\n");
                protocol = US_PR_CB;
                subclass = US_SC_UFI;       /* an assumption */
        }
#endif

        if (dev->descriptor.bDeviceClass != 0 ||
                        iface->desc.bInterfaceClass != USB_CLASS_MASS_STORAGE ||
                        iface->desc.bInterfaceSubClass < US_SC_MIN ||
                        iface->desc.bInterfaceSubClass > US_SC_MAX) {
                /* if it's not a mass storage, we go no further */
                return 0;
        }

        memset(ss, 0, sizeof(struct us_data));

        /* At this point, we know we've got a live one */
        debug("\n\nUSB Mass Storage device detected\n");

        /* Initialize the us_data structure with some useful info */
        ss->flags = flags;
        ss->ifnum = ifnum;
        ss->pusb_dev = dev;
        ss->attention_done = 0;

        /* If the device has subclass and protocol, then use that.  Otherwise,
         * take data from the specific interface.
         */
        if (subclass) {
                ss->subclass = subclass;
                ss->protocol = protocol;
        } else {
                ss->subclass = iface->desc.bInterfaceSubClass;
                ss->protocol = iface->desc.bInterfaceProtocol;
        }

        /* set the handler pointers based on the protocol */
        debug("Transport: ");
        switch (ss->protocol) {
        case US_PR_CB:
                debug("Control/Bulk\n");
                ss->transport = usb_stor_CB_transport;
                ss->transport_reset = usb_stor_CB_reset;
                break;

        case US_PR_CBI:
                debug("Control/Bulk/Interrupt\n");
                ss->transport = usb_stor_CB_transport;
                ss->transport_reset = usb_stor_CB_reset;
                break;
        case US_PR_BULK:
                debug("Bulk/Bulk/Bulk\n");
                ss->transport = usb_stor_BBB_transport;
                ss->transport_reset = usb_stor_BBB_reset;
                break;
        default:
                printf("USB Storage Transport unknown / not yet implemented\n");
                return 0;
                break;
        }

        /*
         * We are expecting a minimum of 2 endpoints - in and out (bulk).
         * An optional interrupt is OK (necessary for CBI protocol).
         * We will ignore any others.
         */
        for (i = 0; i < iface->desc.bNumEndpoints; i++) {
                ep_desc = &iface->ep_desc[i];
                /* is it an BULK endpoint? */
                if ((ep_desc->bmAttributes &
                     USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
                        if (ep_desc->bEndpointAddress & USB_DIR_IN)
                                ss->ep_in = ep_desc->bEndpointAddress &
                                                USB_ENDPOINT_NUMBER_MASK;
                        else
                                ss->ep_out =
                                        ep_desc->bEndpointAddress &
                                        USB_ENDPOINT_NUMBER_MASK;
                }

                /* is it an interrupt endpoint? */
                if ((ep_desc->bmAttributes &
                     USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT) {
                        ss->ep_int = ep_desc->bEndpointAddress &
                                                USB_ENDPOINT_NUMBER_MASK;
                        ss->irqinterval = ep_desc->bInterval;
                }
        }
        debug("Endpoints In %d Out %d Int %d\n",
              ss->ep_in, ss->ep_out, ss->ep_int);

        /* Do some basic sanity checks, and bail if we find a problem */
        if (usb_set_interface(dev, iface->desc.bInterfaceNumber, 0) ||
            !ss->ep_in || !ss->ep_out ||
            (ss->protocol == US_PR_CBI && ss->ep_int == 0)) {
                debug("Problems with device\n");
                return 0;
        }
        /* set class specific stuff */
        /* We only handle certain protocols.  Currently, these are
         * the only ones.
         * The SFF8070 accepts the requests used in u-boot
         */
        if (ss->subclass != US_SC_UFI && ss->subclass != US_SC_SCSI &&
            ss->subclass != US_SC_8070) {
                printf("Sorry, protocol %d not yet supported.\n", ss->subclass);
                return 0;
        }
        if (ss->ep_int) {
                /* we had found an interrupt endpoint, prepare irq pipe
                 * set up the IRQ pipe and handler
                 */
                ss->irqinterval = (ss->irqinterval > 0) ? ss->irqinterval : 255;
                ss->irqpipe = usb_rcvintpipe(ss->pusb_dev, ss->ep_int);
                ss->irqmaxp = usb_maxpacket(dev, ss->irqpipe);
                dev->irq_handle = usb_stor_irq;
        }
        dev->privptr = (void *)ss;
        return 1;
}

int usb_stor_get_info(struct usb_device *dev, struct us_data *ss,
                      block_dev_desc_t *dev_desc)
{
        unsigned char perq, modi;
        ALLOC_CACHE_ALIGN_BUFFER(unsigned long, cap, 2);
        ALLOC_CACHE_ALIGN_BUFFER(unsigned char, usb_stor_buf, 36);
        unsigned long *capacity, *blksz;
        ccb *pccb = &usb_ccb;

        pccb->pdata = usb_stor_buf;

        dev_desc->target = dev->devnum;
        pccb->lun = dev_desc->lun;
        debug(" address %d\n", dev_desc->target);

        if (usb_inquiry(pccb, ss))
                return -1;

        perq = usb_stor_buf[0];
        modi = usb_stor_buf[1];

        if ((perq & 0x1f) == 0x1f) {
                /* skip unknown devices */
                return 0;
        }
        if ((modi&0x80) == 0x80) {
                /* drive is removable */
                dev_desc->removable = 1;
        }
        memcpy(&dev_desc->vendor[0], (const void *) &usb_stor_buf[8], 8);
        memcpy(&dev_desc->product[0], (const void *) &usb_stor_buf[16], 16);
        memcpy(&dev_desc->revision[0], (const void *) &usb_stor_buf[32], 4);
        dev_desc->vendor[8] = 0;
        dev_desc->product[16] = 0;
        dev_desc->revision[4] = 0;
#ifdef CONFIG_USB_BIN_FIXUP
        usb_bin_fixup(dev->descriptor, (uchar *)dev_desc->vendor,
                      (uchar *)dev_desc->product);
#endif /* CONFIG_USB_BIN_FIXUP */
        debug("ISO Vers %X, Response Data %X\n", usb_stor_buf[2],
              usb_stor_buf[3]);
        if (usb_test_unit_ready(pccb, ss)) {
                printf("Device NOT ready\n"
                       "   Request Sense returned %02X %02X %02X\n",
                       pccb->sense_buf[2], pccb->sense_buf[12],
                       pccb->sense_buf[13]);
                if (dev_desc->removable == 1) {
                        dev_desc->type = perq;
                        return 1;
                }
                return 0;
        }
        pccb->pdata = (unsigned char *)&cap[0];
        memset(pccb->pdata, 0, 8);
        if (usb_read_capacity(pccb, ss) != 0) {
                printf("READ_CAP ERROR\n");
                cap[0] = 2880;
                cap[1] = 0x200;
        }
        ss->flags &= ~USB_READY;
        debug("Read Capacity returns: 0x%lx, 0x%lx\n", cap[0], cap[1]);
#if 0
        if (cap[0] > (0x200000 * 10)) /* greater than 10 GByte */
                cap[0] >>= 16;
#endif
        cap[0] = cpu_to_be32(cap[0]);
        cap[1] = cpu_to_be32(cap[1]);

        /* this assumes bigendian! */
        cap[0] += 1;
        capacity = &cap[0];
        blksz = &cap[1];
        debug("Capacity = 0x%lx, blocksz = 0x%lx\n", *capacity, *blksz);
        dev_desc->lba = *capacity;
        dev_desc->blksz = *blksz;
        dev_desc->log2blksz = LOG2(dev_desc->blksz);
        dev_desc->type = perq;
        debug(" address %d\n", dev_desc->target);
        debug("partype: %d\n", dev_desc->part_type);

        init_part(dev_desc);

        debug("partype: %d\n", dev_desc->part_type);
        return 1;
}