Initial revision

1 files changed, 895 insertions, 0 deletions

diff --git a/common/usb_storage.c b/common/usb_storage.c
new file mode 100644
index 0000000..b134721
--- /dev/null
+++ b/common/usb_storage.c
@@ -0,0 +1,895 @@
+/*
+ * (C) Copyright 2001
+ * Denis Peter, MPL AG Switzerland
+ *
+ * Most of this source has been derived from the Linux USB
+ * project.
+ *
+ * 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.
+ */
+
+
+
+#include <common.h>
+#include <command.h>
+#include <asm/processor.h>
+
+
+#if (CONFIG_COMMANDS & CFG_CMD_USB)
+#include <usb.h>
+
+#ifdef CONFIG_USB_STORAGE
+
+#undef	USB_STOR_DEBUG
+
+#ifdef	USB_STOR_DEBUG
+#define	USB_STOR_PRINTF(fmt,args...)	printf (fmt ,##args)
+#else
+#define USB_STOR_PRINTF(fmt,args...)
+#endif
+
+#include <scsi.h>
+/* direction table -- this indicates the direction of the data
+ * transfer for each command code -- a 1 indicates input
+ */
+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 unsigned char usb_stor_buf[512];
+static ccb usb_ccb;
+
+/*
+ * CBI style
+ */
+
+#define US_CBI_ADSC		0
+
+
+#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*, struct us_data*);
+typedef int (*trans_reset)(struct us_data*);
+
+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 */
+	ccb							*srb;		 /* current srb */
+	trans_reset			transport_reset; /* reset routine */
+	trans_cmnd			transport; /* transport routine */
+};
+
+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, unsigned long blknr, unsigned long blkcnt, unsigned long *buffer);
+struct usb_device * usb_get_dev_index(int index);
+void uhci_show_temp_int_td(void);
+
+block_dev_desc_t *usb_stor_get_dev(int index)
+{
+	return &usb_dev_desc[index];
+}
+
+
+void usb_show_progress(void)
+{
+	printf(".");
+}
+
+/*********************************************************************************
+ * (re)-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 bus for storage devices...\n");
+	}
+	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].target=0xff;
+		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].block_read=usb_stor_read;
+	}
+	usb_max_devs=0;
+	for(i=0;i<USB_MAX_DEVICE;i++) {
+		dev=usb_get_dev_index(i); /* get device */
+		USB_STOR_PRINTF("i=%d\n",i);
+		if(dev==NULL) {
+			break; /* no more devices avaiable */
+		}
+		if(usb_storage_probe(dev,0,&usb_stor[usb_max_devs])) { /* ok, it is a storage devices */
+			/* get info and fill it in */
+
+			if(usb_stor_get_info(dev, &usb_stor[usb_max_devs], &usb_dev_desc[usb_max_devs])) {
+				if(mode==1) {
+					printf ("  Device %d: ", usb_max_devs);
+					dev_print(&usb_dev_desc[usb_max_devs]);
+				} /* if mode */
+				usb_max_devs++;
+			} /* if get info ok */
+		} /* 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 */
+	if(usb_max_devs>0)
+		return 0;
+	else
+		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	USB_STOR_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 */
+			USB_STOR_PRINTF("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);
+			USB_STOR_PRINTF("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 USB_STOR_DEBUG
+				display_int_status(us->pusb_dev->status);
+#endif
+				if (us->pusb_dev->status & USB_ST_STALLED) {
+					USB_STOR_PRINTF("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) {
+						USB_STOR_PRINTF("bulk transferred with error %X, but data ok\n",us->pusb_dev->status);
+						return 0;
+					}
+					else
+						return result;
+				}
+				if (us->pusb_dev->status & USB_ST_NAK_REC) {
+					USB_STOR_PRINTF("Device NAKed bulk_msg\n");
+					return result;
+				}
+				if(this_xfer == partial) {
+					USB_STOR_PRINTF("bulk transferred with error %d, but data ok\n",us->pusb_dev->status);
+					return 0;
+				}
+				/* if our try counter reaches 0, bail out */
+				USB_STOR_PRINTF("bulk transferred with error %d, 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;
+}
+
+/* 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;
+
+	USB_STOR_PRINTF("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 */
+	wait_ms(1500);
+	USB_STOR_PRINTF("CB_reset result %d: status %X 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));
+
+	USB_STOR_PRINTF("CB_reset done\n");
+	return 0;
+}
+
+/* FIXME: we also need a CBI_command which sets up the completion
+ * interrupt, and waits for it
+ */
+int usb_stor_CB_comdat(ccb *srb, struct us_data *us)
+{
+	int result;
+	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--) {
+		USB_STOR_PRINTF("CBI gets a command: Try %d\n",5-retry);
+#ifdef USB_STOR_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);
+		USB_STOR_PRINTF("CB_transport: control msg returned %d, status %X\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;
+				USB_STOR_PRINTF(" stall during command found, clear pipe\n");
+				usb_clear_halt(us->pusb_dev,  usb_sndctrlpipe(us->pusb_dev,0));
+				us->pusb_dev->status=status;
+			}
+			USB_STOR_PRINTF(" error during command %02X Stat = %X\n",srb->cmd[0],us->pusb_dev->status);
+			return result;
+		}
+		/* transfer the data payload for this command, if one exists*/
+
+		USB_STOR_PRINTF("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, srb->pdata,srb->datalen);
+			USB_STOR_PRINTF("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;
+}
+
+
+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==0)
+			break;
+		wait_ms(10);
+	}
+	if (us->ip_wanted) {
+		printf("       Did not get interrupt on CBI\n");
+		us->ip_wanted = 0;
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+	USB_STOR_PRINTF("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
+
+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);
+	USB_STOR_PRINTF("command / Data returned %d, status %X\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) {
+			USB_STOR_PRINTF(" 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) {
+				USB_STOR_PRINTF(" 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)) {
+		USB_STOR_PRINTF("ERROR %X\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 */
+		USB_STOR_PRINTF("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);
+	USB_STOR_PRINTF("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)) {
+		USB_STOR_PRINTF(" AUTO REQUEST ERROR %d\n",us->pusb_dev->status);
+		return USB_STOR_TRANSPORT_ERROR;
+	}
+	USB_STOR_PRINTF("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 {
+				wait_ms(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=3;
+	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);
+		USB_STOR_PRINTF("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;
+	return 0;
+	ptr=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);
+	USB_STOR_PRINTF("Request Sense returned %02X %02X %02X\n",srb->sense_buf[2],srb->sense_buf[12],srb->sense_buf[13]);
+	srb->pdata=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)
+		{
+			return 0;
+		}
+	} while(retries--);
+	return -1;
+}
+
+static int usb_read_capacity(ccb *srb,struct us_data *ss)
+{
+	int retry;
+	retry=2; /* retries */
+	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;
+	USB_STOR_PRINTF("read10: start %lx blocks %x\n",start,blocks);
+	return ss->transport(srb,ss);
+}
+
+
+#define USB_MAX_READ_BLK 20
+
+unsigned long usb_stor_read(int device, unsigned long blknr, unsigned long blkcnt, unsigned long *buffer)
+{
+	unsigned long start,blks, buf_addr;
+	unsigned short smallblks;
+	struct usb_device *dev;
+	int retry,i;
+	ccb *srb=&usb_ccb;
+	device&=0xff;
+	/* Setup  device
+	 */
+	USB_STOR_PRINTF("\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;
+	}
+
+	usb_disable_asynch(1); /* asynch transfer not allowed */
+	srb->lun=usb_dev_desc[device].lun;
+	buf_addr=(unsigned long)buffer;
+	start=blknr;
+	blks=blkcnt;
+	if(usb_test_unit_ready(srb,(struct us_data *)dev->privptr)) {
+		printf("Device NOT ready\n   Request Sense returned %02X %02X %02X\n",
+			srb->sense_buf[2],srb->sense_buf[12],srb->sense_buf[13]);
+		return 0;
+	}
+	USB_STOR_PRINTF("\nusb_read: dev %d startblk %lx, blccnt %lx buffer %lx\n",device,start,blks, buf_addr);
+	do {
+		retry=2;
+		srb->pdata=(unsigned char *)buf_addr;
+		if(blks>USB_MAX_READ_BLK) {
+			smallblks=USB_MAX_READ_BLK;
+		}
+		else {
+			smallblks=(unsigned short) blks;
+		}
+retry_it:
+		if(smallblks==USB_MAX_READ_BLK)
+			usb_show_progress();
+		srb->datalen=usb_dev_desc[device].blksz * smallblks;
+		srb->pdata=(unsigned char *)buf_addr;
+		if(usb_read_10(srb,(struct us_data *)dev->privptr, start, smallblks)) {
+			USB_STOR_PRINTF("Read ERROR\n");
+			usb_request_sense(srb,(struct us_data *)dev->privptr);
+			if(retry--)
+				goto retry_it;
+			blkcnt-=blks;
+			break;
+		}
+		start+=smallblks;
+		blks-=smallblks;
+		buf_addr+=srb->datalen;
+	} while(blks!=0);
+	USB_STOR_PRINTF("usb_read: end startblk %lx, blccnt %x buffer %lx\n",start,smallblks,buf_addr);
+	usb_disable_asynch(0); /* asynch transfer allowed */
+	if(blkcnt>=USB_MAX_READ_BLK)
+		printf("\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_descriptor *iface;
+	int i;
+	unsigned int flags = 0;
+
+	int protocol = 0;
+	int subclass = 0;
+
+
+	memset(ss, 0, sizeof(struct us_data));
+
+	/* let's examine the device now */
+	iface = &dev->config.if_desc[ifnum];
+
+#if 0
+	/* this is the place to patch some storage devices */
+	USB_STOR_PRINTF("iVendor %X iProduct %X\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
+	if ((dev->descriptor.idVendor) == 0x066b && (dev->descriptor.idProduct) == 0x0103) {
+		USB_STOR_PRINTF("patched for E-USB\n");
+		protocol = US_PR_CB;
+		subclass = US_SC_UFI;	    /* an assumption */
+	}
+#endif
+
+	if (dev->descriptor.bDeviceClass != 0 ||
+			iface->bInterfaceClass != USB_CLASS_MASS_STORAGE ||
+			iface->bInterfaceSubClass < US_SC_MIN ||
+			iface->bInterfaceSubClass > US_SC_MAX) {
+		/* if it's not a mass storage, we go no further */
+		return 0;
+	}
+
+	/* At this point, we know we've got a live one */
+	USB_STOR_PRINTF("\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->bInterfaceSubClass;
+		ss->protocol = iface->bInterfaceProtocol;
+	}
+
+	/* set the handler pointers based on the protocol */
+	USB_STOR_PRINTF("Transport: ");
+	switch (ss->protocol) {
+	case US_PR_CB:
+		USB_STOR_PRINTF("Control/Bulk\n");
+		ss->transport = usb_stor_CB_transport;
+		ss->transport_reset = usb_stor_CB_reset;
+		break;
+
+	case US_PR_CBI:
+		USB_STOR_PRINTF("Control/Bulk/Interrupt\n");
+		ss->transport = usb_stor_CB_transport;
+		ss->transport_reset = usb_stor_CB_reset;
+		break;
+	default:
+		printf("USB Starage 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->bNumEndpoints; i++) {
+		/* is it an BULK endpoint? */
+		if ((iface->ep_desc[i].bmAttributes &  USB_ENDPOINT_XFERTYPE_MASK)
+		    == USB_ENDPOINT_XFER_BULK) {
+			if (iface->ep_desc[i].bEndpointAddress & USB_DIR_IN)
+				ss->ep_in = iface->ep_desc[i].bEndpointAddress &
+					USB_ENDPOINT_NUMBER_MASK;
+			else
+				ss->ep_out = iface->ep_desc[i].bEndpointAddress &
+					USB_ENDPOINT_NUMBER_MASK;
+		}
+
+		/* is it an interrupt endpoint? */
+		if ((iface->ep_desc[i].bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
+		    == USB_ENDPOINT_XFER_INT) {
+			ss->ep_int = iface->ep_desc[i].bEndpointAddress &
+				USB_ENDPOINT_NUMBER_MASK;
+			ss->irqinterval = iface->ep_desc[i].bInterval;
+		}
+	}
+	USB_STOR_PRINTF("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->bInterfaceNumber, 0) ||
+	    !ss->ep_in || !ss->ep_out ||
+	    (ss->protocol == US_PR_CBI && ss->ep_int == 0)) {
+		USB_STOR_PRINTF("Problems with device\n");
+		return 0;
+	}
+	/* set class specific stuff */
+	/* We only handle certain protocols.  Currently, this is
+	 * the only one.
+	 */
+	if (ss->subclass != US_SC_UFI) {
+		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;
+	unsigned long cap[2];
+	unsigned long *capacity,*blksz;
+	ccb *pccb=&usb_ccb;
+
+	ss->transport_reset(ss);
+	pccb->pdata=usb_stor_buf;
+
+	dev_desc->target=dev->devnum;
+	pccb->lun=dev_desc->lun;
+	USB_STOR_PRINTF(" 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) {
+		return 0; /* skip unknown devices */
+	}
+	if((modi&0x80)==0x80) {/* drive is removable */
+		dev_desc->removable=1;
+	}
+	memcpy(&dev_desc->vendor[0], &usb_stor_buf[8], 8);
+	memcpy(&dev_desc->product[0], &usb_stor_buf[16], 16);
+	memcpy(&dev_desc->revision[0], &usb_stor_buf[32], 4);
+	dev_desc->vendor[8]=0;
+	dev_desc->product[16]=0;
+	dev_desc->revision[4]=0;
+	USB_STOR_PRINTF("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;
+		}
+		else
+			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;
+	}
+	USB_STOR_PRINTF("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]+=1;
+	capacity=&cap[0];
+	blksz=&cap[1];
+	USB_STOR_PRINTF("Capacity = 0x%lx, blocksz = 0x%lx\n",*capacity,*blksz);
+	dev_desc->lba=*capacity;
+	dev_desc->blksz=*blksz;
+	dev_desc->type=perq;
+	USB_STOR_PRINTF(" address %d\n",dev_desc->target);
+	USB_STOR_PRINTF("partype: %d\n",dev_desc->part_type);
+
+	init_part(dev_desc);
+
+	USB_STOR_PRINTF("partype: %d\n",dev_desc->part_type);
+	return 1;
+}
+
+#endif
+#endif /* CONFIG_USB_STORAGE */
+
+
+