예제 #1
0
파일: sddr55.c 프로젝트: 513855417/linux
static int sddr55_read_data(struct us_data *us,
		unsigned int lba,
		unsigned int page,
		unsigned short sectors) {

	int result = USB_STOR_TRANSPORT_GOOD;
	unsigned char *command = us->iobuf;
	unsigned char *status = us->iobuf;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
	unsigned char *buffer;

	unsigned int pba;
	unsigned long address;

	unsigned short pages;
	unsigned int len, offset;
	struct scatterlist *sg;

	// Since we only read in one block at a time, we have to create
	// a bounce buffer and move the data a piece at a time between the
	// bounce buffer and the actual transfer buffer.

	len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
			info->smallpageshift) * PAGESIZE;
	buffer = kmalloc(len, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR; /* out of memory */
	offset = 0;
	sg = NULL;

	while (sectors>0) {

		/* have we got to end? */
		if (lba >= info->max_log_blks)
			break;

		pba = info->lba_to_pba[lba];

		// Read as many sectors as possible in this block

		pages = min((unsigned int) sectors << info->smallpageshift,
				info->blocksize - page);
		len = pages << info->pageshift;

		usb_stor_dbg(us, "Read %02X pages, from PBA %04X (LBA %04X) page %02X\n",
			     pages, pba, lba, page);

		if (pba == NOT_ALLOCATED) {
			/* no pba for this lba, fill with zeroes */
			memset (buffer, 0, len);
		} else {

			address = (pba << info->blockshift) + page;

			command[0] = 0;
			command[1] = LSB_of(address>>16);
			command[2] = LSB_of(address>>8);
			command[3] = LSB_of(address);

			command[4] = 0;
			command[5] = 0xB0;
			command[6] = LSB_of(pages << (1 - info->smallpageshift));
			command[7] = 0x85;

			/* send command */
			result = sddr55_bulk_transport(us,
				DMA_TO_DEVICE, command, 8);

			usb_stor_dbg(us, "Result for send_command in read_data %d\n",
				     result);

			if (result != USB_STOR_XFER_GOOD) {
				result = USB_STOR_TRANSPORT_ERROR;
				goto leave;
			}

			/* read data */
			result = sddr55_bulk_transport(us,
				DMA_FROM_DEVICE, buffer, len);

			if (result != USB_STOR_XFER_GOOD) {
				result = USB_STOR_TRANSPORT_ERROR;
				goto leave;
			}

			/* now read status */
			result = sddr55_bulk_transport(us,
				DMA_FROM_DEVICE, status, 2);

			if (result != USB_STOR_XFER_GOOD) {
				result = USB_STOR_TRANSPORT_ERROR;
				goto leave;
			}

			/* check status for error */
			if (status[0] == 0xff && status[1] == 0x4) {
				set_sense_info (3, 0x11, 0);
				result = USB_STOR_TRANSPORT_FAILED;
				goto leave;
			}
		}

		// Store the data in the transfer buffer
		usb_stor_access_xfer_buf(buffer, len, us->srb,
				&sg, &offset, TO_XFER_BUF);

		page = 0;
		lba++;
		sectors -= pages >> info->smallpageshift;
	}

	result = USB_STOR_TRANSPORT_GOOD;

leave:
	kfree(buffer);

	return result;
}
예제 #2
0
파일: sddr55.c 프로젝트: 513855417/linux
static int sddr55_write_data(struct us_data *us,
		unsigned int lba,
		unsigned int page,
		unsigned short sectors) {

	int result = USB_STOR_TRANSPORT_GOOD;
	unsigned char *command = us->iobuf;
	unsigned char *status = us->iobuf;
	struct sddr55_card_info *info = (struct sddr55_card_info *)us->extra;
	unsigned char *buffer;

	unsigned int pba;
	unsigned int new_pba;
	unsigned long address;

	unsigned short pages;
	int i;
	unsigned int len, offset;
	struct scatterlist *sg;

	/* check if we are allowed to write */
	if (info->read_only || info->force_read_only) {
		set_sense_info (7, 0x27, 0);	/* read only */
		return USB_STOR_TRANSPORT_FAILED;
	}

	// Since we only write one block at a time, we have to create
	// a bounce buffer and move the data a piece at a time between the
	// bounce buffer and the actual transfer buffer.

	len = min((unsigned int) sectors, (unsigned int) info->blocksize >>
			info->smallpageshift) * PAGESIZE;
	buffer = kmalloc(len, GFP_NOIO);
	if (buffer == NULL)
		return USB_STOR_TRANSPORT_ERROR;
	offset = 0;
	sg = NULL;

	while (sectors > 0) {

		/* have we got to end? */
		if (lba >= info->max_log_blks)
			break;

		pba = info->lba_to_pba[lba];

		// Write as many sectors as possible in this block

		pages = min((unsigned int) sectors << info->smallpageshift,
				info->blocksize - page);
		len = pages << info->pageshift;

		// Get the data from the transfer buffer
		usb_stor_access_xfer_buf(buffer, len, us->srb,
				&sg, &offset, FROM_XFER_BUF);

		usb_stor_dbg(us, "Write %02X pages, to PBA %04X (LBA %04X) page %02X\n",
			     pages, pba, lba, page);
			
		command[4] = 0;

		if (pba == NOT_ALLOCATED) {
			/* no pba allocated for this lba, find a free pba to use */

			int max_pba = (info->max_log_blks / 250 ) * 256;
			int found_count = 0;
			int found_pba = -1;

			/* set pba to first block in zone lba is in */
			pba = (lba / 1000) * 1024;

			usb_stor_dbg(us, "No PBA for LBA %04X\n", lba);

			if (max_pba > 1024)
				max_pba = 1024;

			/*
			 * Scan through the map looking for an unused block
			 * leave 16 unused blocks at start (or as many as
			 * possible) since the sddr55 seems to reuse a used
			 * block when it shouldn't if we don't leave space.
			 */
			for (i = 0; i < max_pba; i++, pba++) {
				if (info->pba_to_lba[pba] == UNUSED_BLOCK) {
					found_pba = pba;
					if (found_count++ > 16)
						break;
				}
			}

			pba = found_pba;

			if (pba == -1) {
				/* oh dear */
				usb_stor_dbg(us, "Couldn't find unallocated block\n");

				set_sense_info (3, 0x31, 0);	/* medium error */
				result = USB_STOR_TRANSPORT_FAILED;
				goto leave;
			}

			usb_stor_dbg(us, "Allocating PBA %04X for LBA %04X\n",
				     pba, lba);

			/* set writing to unallocated block flag */
			command[4] = 0x40;
		}

		address = (pba << info->blockshift) + page;

		command[1] = LSB_of(address>>16);
		command[2] = LSB_of(address>>8); 
		command[3] = LSB_of(address);

		/* set the lba into the command, modulo 1000 */
		command[0] = LSB_of(lba % 1000);
		command[6] = MSB_of(lba % 1000);

		command[4] |= LSB_of(pages >> info->smallpageshift);
		command[5] = 0xB0;
		command[7] = 0x86;

		/* send command */
		result = sddr55_bulk_transport(us,
			DMA_TO_DEVICE, command, 8);

		if (result != USB_STOR_XFER_GOOD) {
			usb_stor_dbg(us, "Result for send_command in write_data %d\n",
				     result);

			/* set_sense_info is superfluous here? */
			set_sense_info (3, 0x3, 0);/* peripheral write error */
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		/* send the data */
		result = sddr55_bulk_transport(us,
			DMA_TO_DEVICE, buffer, len);

		if (result != USB_STOR_XFER_GOOD) {
			usb_stor_dbg(us, "Result for send_data in write_data %d\n",
				     result);

			/* set_sense_info is superfluous here? */
			set_sense_info (3, 0x3, 0);/* peripheral write error */
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		/* now read status */
		result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, status, 6);

		if (result != USB_STOR_XFER_GOOD) {
			usb_stor_dbg(us, "Result for get_status in write_data %d\n",
				     result);

			/* set_sense_info is superfluous here? */
			set_sense_info (3, 0x3, 0);/* peripheral write error */
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		new_pba = (status[3] + (status[4] << 8) + (status[5] << 16))
						  >> info->blockshift;

		/* check status for error */
		if (status[0] == 0xff && status[1] == 0x4) {
			info->pba_to_lba[new_pba] = BAD_BLOCK;

			set_sense_info (3, 0x0c, 0);
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		usb_stor_dbg(us, "Updating maps for LBA %04X: old PBA %04X, new PBA %04X\n",
			     lba, pba, new_pba);

		/* update the lba<->pba maps, note new_pba might be the same as pba */
		info->lba_to_pba[lba] = new_pba;
		info->pba_to_lba[pba] = UNUSED_BLOCK;

		/* check that new_pba wasn't already being used */
		if (info->pba_to_lba[new_pba] != UNUSED_BLOCK) {
			printk(KERN_ERR "sddr55 error: new PBA %04X already in use for LBA %04X\n",
				new_pba, info->pba_to_lba[new_pba]);
			info->fatal_error = 1;
			set_sense_info (3, 0x31, 0);
			result = USB_STOR_TRANSPORT_FAILED;
			goto leave;
		}

		/* update the pba<->lba maps for new_pba */
		info->pba_to_lba[new_pba] = lba % 1000;

		page = 0;
		lba++;
		sectors -= pages >> info->smallpageshift;
	}
	result = USB_STOR_TRANSPORT_GOOD;

 leave:
	kfree(buffer);
	return result;
}
예제 #3
0
static int sddr55_read_map(struct us_data *us) {

	struct sddr55_card_info *info = (struct sddr55_card_info *)(us->extra);
	int numblocks;
	unsigned char *buffer;
	unsigned char *command = us->iobuf;
	int i;
	unsigned short lba;
	unsigned short max_lba;
	int result;

	if (!info->capacity)
		return -1;

	numblocks = info->capacity >> (info->blockshift + info->pageshift);
	
	buffer = kmalloc( numblocks * 2, GFP_NOIO );
	
	if (!buffer)
		return -1;

	memset(command, 0, 8);
	command[5] = 0xB0;
	command[6] = numblocks * 2 / 256;
	command[7] = 0x8A;

	result = sddr55_bulk_transport(us, DMA_TO_DEVICE, command, 8);

	if ( result != USB_STOR_XFER_GOOD) {
		kfree (buffer);
		return -1;
	}

	result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, buffer, numblocks * 2);

	if ( result != USB_STOR_XFER_GOOD) {
		kfree (buffer);
		return -1;
	}

	result = sddr55_bulk_transport(us, DMA_FROM_DEVICE, command, 2);

	if ( result != USB_STOR_XFER_GOOD) {
		kfree (buffer);
		return -1;
	}

	kfree(info->lba_to_pba);
	kfree(info->pba_to_lba);
	info->lba_to_pba = kmalloc(numblocks*sizeof(int), GFP_NOIO);
	info->pba_to_lba = kmalloc(numblocks*sizeof(int), GFP_NOIO);

	if (info->lba_to_pba == NULL || info->pba_to_lba == NULL) {
		kfree(info->lba_to_pba);
		kfree(info->pba_to_lba);
		info->lba_to_pba = NULL;
		info->pba_to_lba = NULL;
		kfree(buffer);
		return -1;
	}

	memset(info->lba_to_pba, 0xff, numblocks*sizeof(int));
	memset(info->pba_to_lba, 0xff, numblocks*sizeof(int));

	/* set maximum lba */
	max_lba = info->max_log_blks;
	if (max_lba > 1000)
		max_lba = 1000;

	// Each block is 64 bytes of control data, so block i is located in
	// scatterlist block i*64/128k = i*(2^6)*(2^-17) = i*(2^-11)

	for (i=0; i<numblocks; i++) {
		int zone = i / 1024;

		lba = short_pack(buffer[i * 2], buffer[i * 2 + 1]);

			/* Every 1024 physical blocks ("zone"), the LBA numbers
			 * go back to zero, but are within a higher
			 * block of LBA's. Also, there is a maximum of
			 * 1000 LBA's per zone. In other words, in PBA
			 * 1024-2047 you will find LBA 0-999 which are
			 * really LBA 1000-1999. Yes, this wastes 24
			 * physical blocks per zone. Go figure. 
			 * These devices can have blocks go bad, so there
			 * are 24 spare blocks to use when blocks do go bad.
			 */

			/* SDDR55 returns 0xffff for a bad block, and 0x400 for the 
			 * CIS block. (Is this true for cards 8MB or less??)
			 * Record these in the physical to logical map
			 */ 

		info->pba_to_lba[i] = lba;

		if (lba >= max_lba) {
			continue;
		}
		
		if (info->lba_to_pba[lba + zone * 1000] != NOT_ALLOCATED &&
		    !info->force_read_only) {
			printk("sddr55: map inconsistency at LBA %04X\n", lba + zone * 1000);
			info->force_read_only = 1;
		}

		if (lba<0x10 || (lba>=0x3E0 && lba<0x3EF))
			US_DEBUGP("LBA %04X <-> PBA %04X\n", lba, i);

		info->lba_to_pba[lba + zone * 1000] = i;
	}

	kfree(buffer);
	return 0;
}