usb_storage.c

基于s3c2440的U盘读写程序

        break;
    default:
        if(retry++ > USB_TRANSPORT_UNKNOWN_RETRY) 
        {
            USB_STOR_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);
        USB_STOR_PRINTF("inquiry returns %d\n",i);
        if(i==0)
        break;
    } 
    while(retry--);
    if(!retry) 
    {
        USB_STOR_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);
    USB_STOR_PRINTF("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 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;
        }
        usb_request_sense (srb, ss);
        wait_ms (100);
    } 
    while(retries--);
    return -1;
}


static int usb_read_capacity(ccb *srb,struct us_data *ss)
{
    int retry;
    retry = 3; /* 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;
    if (blkcnt == 0)
    return 0;
    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)) 
    {
        USB_STOR_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)
    USB_STOR_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;
    /* let's examine the device now */
    iface = &dev->config.if_desc[ifnum];
    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;
    }
    memset(ss, 0, sizeof(struct us_data));
    /* 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;
    case US_PR_BULK:
        USB_STOR_PRINTF("Bulk/Bulk/Bulk\n");
        ss->transport = usb_stor_BBB_transport;
        ss->transport_reset = usb_stor_BBB_reset;
        break;
    default:
        USB_STOR_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->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, 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) 
    {
        USB_STOR_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;
    /* for some reasons a couple of devices would not survive this reset */
    if (
    /* Sony USM256E */
    (dev->descriptor.idVendor == 0x054c &&
    dev->descriptor.idProduct == 0x019e)
    ||
    /* USB007 Mini-USB2 Flash Drive */
    (dev->descriptor.idVendor == 0x066f &&
    dev->descriptor.idProduct == 0x2010)
    )
    USB_STOR_PRINTF("usb_stor_get_info: skipping RESET..\n");
    else
    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)) 
    {
        USB_STOR_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) 
    {
        USB_STOR_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]);
    cap[0] = ((unsigned long)(
    (((unsigned long)(cap[0]) & (unsigned long)0x000000ffUL) << 24) |
    (((unsigned long)(cap[0]) & (unsigned long)0x0000ff00UL) <<  8) |
    (((unsigned long)(cap[0]) & (unsigned long)0x00ff0000UL) >>  8) |
    (((unsigned long)(cap[0]) & (unsigned long)0xff000000UL) >> 24) ));
    cap[1] = ((unsigned long)(
    (((unsigned long)(cap[1]) & (unsigned long)0x000000ffUL) << 24) |
    (((unsigned long)(cap[1]) & (unsigned long)0x0000ff00UL) <<  8) |
    (((unsigned long)(cap[1]) & (unsigned long)0x00ff0000UL) >>  8) |
    (((unsigned long)(cap[1]) & (unsigned long)0xff000000UL) >> 24) ));
    /* this assumes bigendian! */
    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;
}