usb_storage.c

{
	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;
}