amt630h-sdk-beta/STEPLDR/Src/usb/usb_massstorage.c

#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <stdbool.h>

#define CONFIG_USB_STORAGE

#include "usb_os_adapter.h"
#include "trace.h"
#include <linux/usb/ch9.h>
#include "scsi.h"
#include "usb.h"
#include "dwc2_compat.h"
#include <linux/errno.h>
#include "ark_dwc2.h"
#include "usb_massstorage.h"
#include "timer.h"
#include "fs/ff.h"
#include "fs/diskio.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)

#pragma pack(ARCH_DMA_MINALIGN)
static struct scsi_cmd usb_ccb;
static u32 CBWTag;

static int usb_max_devs; /* number of highest available usb device */

struct blk_desc usb_dev_desc[6];

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

#define USB_READY	(1 << 0)
struct us_data {
	struct usb_device *pusb_dev;	 /* this usb_device */
	unsigned int	flags;			/* from filter initially */
	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 */
	struct scsi_cmd	*srb;			/* current srb */
	trans_reset	transport_reset;	/* reset routine */
	trans_cmnd	transport;		/* transport routine */
	unsigned short	max_xfer_blk;		/* maximum transfer blocks */
};

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

static int usb_media_ready = 0;

/***********************************************************************
 * Data transfer routines
 ***********************************************************************/

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;
}

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;
	}
	if (usb_media_ready == 0)
		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;
}

/*
 * 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(struct scsi_cmd *srb, struct us_data *us)
{
	int result;
	int actlen;
	int dir_in;
	unsigned int pipe;
	ALLOC_CACHE_ALIGN_BUFFER(struct umass_bbb_cbw, cbw, 1);

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

	/* 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;
}

#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)
{
	/* ENDPOINT_HALT = 0, so set value to 0 */
	return 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);
}

static int usb_stor_BBB_transport(struct scsi_cmd *srb, struct us_data *us)
{
	int result, retry;
	int dir_in;
	int actlen, data_actlen;
	unsigned int pipe, pipein, pipeout;
	ALLOC_CACHE_ALIGN_BUFFER(struct umass_bbb_csw, csw, 1);

	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;
	}

	/* STATUS phase + error handling */
	char *tmpcsw;
st:
	retry = 0;
again:
	//debug("STATUS phase\n");
	tmpcsw = (char *)csw;
	tmpcsw[0] = 0x55;
	tmpcsw[1] = 0x53;
	tmpcsw[2] = 0x42;
	tmpcsw[3] = 0x43;
	tmpcsw[4] = 0x01;
	tmpcsw[5] = 0x00;
	tmpcsw[6] = 0x00;
	tmpcsw[7] = 0x00;
	tmpcsw[8] = 0x24;
	tmpcsw[9] = 0x00;
	tmpcsw[10] = 0x00;
	tmpcsw[11] = 0x00;
	tmpcsw[12] = 0x80;
	
	
	result = usb_bulk_msg(us->pusb_dev, pipein, csw, UMASS_BBB_CSW_SIZE,
				&actlen, USB_CNTL_TIMEOUT);

	/* 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;
	}

	/* 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_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;
}

static void usb_stor_set_max_xfer_blk(struct usb_device *udev,
				      struct us_data *us)
{
	unsigned short blk = 20;

	us->max_xfer_blk = blk;
}

static int usb_inquiry(struct scsi_cmd *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(struct scsi_cmd *srb, struct us_data *ss)
{
	char *ptr;
	int ret = -1;

	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;
	ret = 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 = (unsigned char *)ptr;
	return ret;
}

static int usb_test_unit_ready(struct scsi_cmd *srb, struct us_data *ss)
{
	int retries = 10;
	int ret = -1;

	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;
		}
		ret = usb_request_sense(srb, ss);
		if (ret != USB_STOR_TRANSPORT_GOOD)
			break;
		/*
		 * 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;
		if (usb_media_ready == 0)
			break;
		mdelay(100);
	} while (retries--);

	return -1;
}

static int usb_read_capacity(struct scsi_cmd *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(struct scsi_cmd *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);
}

/* 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;

	/* let's examine the device now */
	iface = &dev->config.if_desc[ifnum];
	if (dev->descriptor.bDeviceClass != 0 ||
			iface->desc.bInterfaceClass != USB_CLASS_MASS_STORAGE ||
			iface->desc.bInterfaceSubClass < US_SC_MIN ||
			iface->desc.bInterfaceSubClass > US_SC_MAX) {
		//SendUartString("Not mass storage\r\n");
		/* if it's not a mass storage, we go no further */
		return 0;
	}
	memset(ss, 0, sizeof(struct us_data));
	usb_media_ready = 1;

	/* 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;
	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_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;
	}

	/* Set the maximum transfer size per host controller setting */
	usb_stor_set_max_xfer_blk(dev, ss);

	dev->privptr = (void *)ss;
	return 1;
}

int usb_stor_get_info(struct usb_device *dev, struct us_data *ss,
		      struct blk_desc *dev_desc)
{
	unsigned char perq, modi;
	ALLOC_CACHE_ALIGN_BUFFER(u32, cap, 2);
	ALLOC_CACHE_ALIGN_BUFFER(u8, usb_stor_buf, 36);
	u32 capacity, blksz;
	struct scsi_cmd *pccb = &usb_ccb;
	memset(usb_stor_buf, 0, 36);
	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)) {
		//debug("%s: usb_inquiry() failed\n", __func__);
		return -1;
	}

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

	/*
	 * Skip unknown devices (0x1f) and enclosure service devices (0x0d),
	 * they would not respond to test_unit_ready .
	 */
	if (((perq & 0x1f) == 0x1f) || ((perq & 0x1f) == 0x0d)) {
		//debug("%s: unknown/unsupported device\n", __func__);
		return 0;
	}
	if ((modi&0x80) == 0x80) {
		/* drive is removable */
		dev_desc->removable = 1;
	}
	memcpy(dev_desc->vendor, (const void *)&usb_stor_buf[8], 8);
	memcpy(dev_desc->product, (const void *)&usb_stor_buf[16], 16);
	memcpy(dev_desc->revision, (const void *)&usb_stor_buf[32], 4);
	dev_desc->vendor[8] = 0;
	dev_desc->product[16] = 0;
	dev_desc->revision[4] = 0;
	/* 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 0;
	}
	pccb->pdata = (unsigned char *)cap;
	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%08x, 0x%08x\n", cap[0], cap[1]);
#if 0
	if (cap[0] > (0x200000 * 10)) /* greater than 10 GByte */
		cap[0] >>= 16;

	cap[0] = cpu_to_be32(cap[0]);
	cap[1] = cpu_to_be32(cap[1]);
#endif

	capacity = be32_to_cpu(cap[0]) + 1;
	blksz = be32_to_cpu(cap[1]);

	dev_desc->lba = capacity;
	dev_desc->blksz = blksz;
	dev_desc->log2blksz = LOG2(dev_desc->blksz);
	dev_desc->type = perq;

	return 1;
}

static unsigned long usb_stor_read(struct blk_desc *block_dev, lbaint_t blknr,
				   lbaint_t blkcnt, void *buffer)
{
	lbaint_t start, blks;
	uintptr_t buf_addr;
	unsigned short smallblks;
	struct usb_device *udev;
	struct us_data *ss;
	int retry;
	struct scsi_cmd *srb = &usb_ccb;

	if (blkcnt == 0)
		return 0;
	/* Setup  device */
	udev = usb_dev_desc[block_dev->devnum].priv;
	if (!udev) {
		return 0;
	}

	ss = (struct us_data *)udev->privptr;
	usb_disable_asynch(1); /* asynch transfer not allowed */
	srb->lun = block_dev->lun;
	buf_addr = (uintptr_t)buffer;
	start = blknr;
	blks = blkcnt;

	do {
		retry = 2;
		srb->pdata = (unsigned char *)buf_addr;
		if (blks > ss->max_xfer_blk)
			smallblks = ss->max_xfer_blk;
		else
			smallblks = (unsigned short) blks;
retry_it:
		if (usb_media_ready == 0)
			break;
		/* if (smallblks == ss->max_xfer_blk)
			usb_show_progress(); */
  		srb->datalen = block_dev->blksz * smallblks;
		srb->pdata = (unsigned char *)buf_addr;
		if (usb_read_10(srb, ss, start, smallblks)) {
			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;

	usb_disable_asynch(0);

	return blkcnt;
}

static int usb_stor_probe_device(struct usb_device *udev)
{
	int lun, max_lun;
	int start;

	if (udev == NULL)
		return -ENOENT; /* no more devices available */

	//debug("\n\nProbing for storage\n");

	/* We don't have space to even probe if we hit the maximum */
	if (usb_max_devs == USB_MAX_STOR_DEV) {
		/* printf("max USB Storage Device reached: %d stopping\n",
		       usb_max_devs); */
		return -ENOSPC;
	}

	if (!usb_storage_probe(udev, 0, &usb_stor[usb_max_devs]))
		return 0;

	/*
	 * OK, it's a storage device.  Iterate over its LUNs and populate
	 * usb_dev_desc'
	 */
	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++) {
		struct blk_desc *blkdev;

		blkdev = &usb_dev_desc[usb_max_devs];
		memset(blkdev, '\0', sizeof(struct blk_desc));
		blkdev->if_type = IF_TYPE_USB;
		blkdev->devnum = usb_max_devs;
		blkdev->part_type = PART_TYPE_UNKNOWN;
		blkdev->target = 0xff;
		blkdev->type = DEV_TYPE_UNKNOWN;
		blkdev->block_read = usb_stor_read;
		//blkdev->block_write = usb_stor_write;
		blkdev->lun = lun;
		blkdev->priv = udev;

		if (usb_stor_get_info(udev, &usb_stor[start],
				      &usb_dev_desc[usb_max_devs]) == 1) {
			//debug("partype: %d\n", blkdev->part_type);
			//part_init(blkdev);
			//debug("partype: %d\n", blkdev->part_type);
			usb_max_devs++;
			//debug("%s: Found device %p\n", __func__, udev);
			/* blkdev->disk_priv = (void *)FF_USBDiskInit("/usb");
			if (NULL == blkdev->disk_priv) {
				printf("FF_USBDiskInit failed\r\n");
				continue;
			}
			mdelay(200);
			usb_disk_file_test(); */
		}
	}

	return 0;
}

void usb_stor_reset(void)
{
	usb_max_devs = 0;
	CBWTag = 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;
	
	if (mode == 1)
		SendUartString("scanning usb for storage devices... ");

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

	usb_stor_reset();
	for (i = 0; i < USB_MAX_DEVICE; i++) {
		struct usb_device *dev;

		dev = usb_get_dev_index(i); /* get device */
		//debug("i=%d\n", i);
		if (usb_stor_probe_device(dev))
			break;
	} /* for */

	usb_disable_asynch(0); /* asynch transfer allowed */

	if (usb_max_devs > 0) {
		SendUartString("Storage Device(s) found\r\n");
		return 0;
	}
	return -1;
}

void usb_stor_disconnect()
{
	usb_media_ready = 0;
}

int USB_disk_initialize(void)
{
	return 0;	
}

int USB_disk_read(void *buff, DWORD sector, BYTE count)
{
	struct blk_desc *dev_desc = &usb_dev_desc[0];

	return dev_desc->block_read(dev_desc, sector, count, buff);
}

int USB_disk_ioctl(BYTE ctrl, void *buff)
{
	struct blk_desc *dev_desc = &usb_dev_desc[0];
	
	switch(ctrl)
	{
	case CTRL_SYNC:
		break;
	case GET_SECTOR_COUNT:
		*(DWORD*)buff = dev_desc->lba;
		break;
	case GET_BLOCK_SIZE:
		*(DWORD*)buff = 512;
		break;
	default:
		return -1;	
	}
	return 0;	
}