/*

   * ATAPI CD-ROM driver.

   *

   * Copyright (C) 1994-1996   Scott Snyder <snyder@fnald0.fnal.gov>
   * Copyright (C) 1996-1998   Erik Andersen <andersee@debian.org>
   * Copyright (C) 1998-2000   Jens Axboe <axboe@suse.de>
   * Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz

   *
   * May be copied or modified under the terms of the GNU General Public
   * License.  See linux/COPYING for more information.
   *

   * See Documentation/cdrom/ide-cd for usage information.
   *
   * Suggestions are welcome. Patches that work are more welcome though. ;-)
   * For those wishing to work on this driver, please be sure you download

   * and comply with the latest Mt. Fuji (SFF8090 version 4) and ATAPI
   * (SFF-8020i rev 2.6) standards. These documents can be obtained by

   * anonymous ftp from:
   * ftp://fission.dt.wdc.com/pub/standards/SFF_atapi/spec/SFF8020-r2.6/PS/8020r26.ps
   * ftp://ftp.avc-pioneer.com/Mtfuji4/Spec/Fuji4r10.pdf
   *

   * For historical changelog please see:
   *	Documentation/ide/ChangeLog.ide-cd.1994-2004
   */

  #define IDECD_VERSION "5.00"

  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/kernel.h>
  #include <linux/delay.h>
  #include <linux/timer.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>
  #include <linux/errno.h>
  #include <linux/cdrom.h>
  #include <linux/ide.h>
  #include <linux/completion.h>

  #include <linux/mutex.h>

  #include <linux/bcd.h>

  /* For SCSI -> ATAPI command conversion */
  #include <scsi/scsi.h>

  #include <linux/irq.h>
  #include <linux/io.h>

  #include <asm/byteorder.h>

  #include <linux/uaccess.h>

  #include <asm/unaligned.h>
  
  #include "ide-cd.h"

  static DEFINE_MUTEX(idecd_ref_mutex);

  #define to_ide_cd(obj) container_of(obj, struct cdrom_info, kref)

  
  #define ide_cd_g(disk) \
  	container_of((disk)->private_data, struct cdrom_info, driver)

  static void ide_cd_release(struct kref *);

  static struct cdrom_info *ide_cd_get(struct gendisk *disk)
  {
  	struct cdrom_info *cd = NULL;

  	mutex_lock(&idecd_ref_mutex);

  	cd = ide_cd_g(disk);

  	if (cd) {

  		if (ide_device_get(cd->drive))

  			cd = NULL;

  		else
  			kref_get(&cd->kref);

  	}

  	mutex_unlock(&idecd_ref_mutex);

  	return cd;
  }

  static void ide_cd_put(struct cdrom_info *cd)
  {

  	ide_drive_t *drive = cd->drive;

  	mutex_lock(&idecd_ref_mutex);

  	kref_put(&cd->kref, ide_cd_release);

  	ide_device_put(drive);

  	mutex_unlock(&idecd_ref_mutex);

  }

  /*

   * Generic packet command support and error handling routines.
   */

  /* Mark that we've seen a media change and invalidate our internal buffers. */

  static void cdrom_saw_media_change(ide_drive_t *drive)

  {

  	drive->atapi_flags |= IDE_AFLAG_MEDIA_CHANGED;
  	drive->atapi_flags &= ~IDE_AFLAG_TOC_VALID;

  }
  
  static int cdrom_log_sense(ide_drive_t *drive, struct request *rq,
  			   struct request_sense *sense)
  {
  	int log = 0;

  	if (!sense || !rq || (rq->cmd_flags & REQ_QUIET))

  		return 0;
  
  	switch (sense->sense_key) {

  	case NO_SENSE:
  	case RECOVERED_ERROR:
  		break;
  	case NOT_READY:
  		/*

  		 * don't care about tray state messages for e.g. capacity
  		 * commands or in-progress or becoming ready

  		 */
  		if (sense->asc == 0x3a || sense->asc == 0x04)

  			break;

  		log = 1;
  		break;
  	case ILLEGAL_REQUEST:
  		/*

  		 * don't log START_STOP unit with LoEj set, since we cannot
  		 * reliably check if drive can auto-close

  		 */
  		if (rq->cmd[0] == GPCMD_START_STOP_UNIT && sense->asc == 0x24)

  			break;

  		log = 1;
  		break;
  	case UNIT_ATTENTION:
  		/*

  		 * Make good and sure we've seen this potential media change.
  		 * Some drives (i.e. Creative) fail to present the correct sense
  		 * key in the error register.

  		 */
  		cdrom_saw_media_change(drive);
  		break;
  	default:
  		log = 1;
  		break;

  	}
  	return log;
  }

  static void cdrom_analyze_sense_data(ide_drive_t *drive,

  			      struct request *failed_command,
  			      struct request_sense *sense)
  {

  	unsigned long sector;
  	unsigned long bio_sectors;

  	struct cdrom_info *info = drive->driver_data;

  	if (!cdrom_log_sense(drive, failed_command, sense))
  		return;
  
  	/*

  	 * If a read toc is executed for a CD-R or CD-RW medium where the first
  	 * toc has not been recorded yet, it will fail with 05/24/00 (which is a
  	 * confusing error)

  	 */
  	if (failed_command && failed_command->cmd[0] == GPCMD_READ_TOC_PMA_ATIP)
  		if (sense->sense_key == 0x05 && sense->asc == 0x24)
  			return;

  	/* current error */
  	if (sense->error_code == 0x70) {

  		switch (sense->sense_key) {

  		case MEDIUM_ERROR:
  		case VOLUME_OVERFLOW:
  		case ILLEGAL_REQUEST:
  			if (!sense->valid)
  				break;
  			if (failed_command == NULL ||
  					!blk_fs_request(failed_command))
  				break;
  			sector = (sense->information[0] << 24) |
  				 (sense->information[1] << 16) |
  				 (sense->information[2] <<  8) |
  				 (sense->information[3]);

  			if (drive->queue->hardsect_size == 2048)

  				/* device sector size is 2K */
  				sector <<= 2;

  
  			bio_sectors = max(bio_sectors(failed_command->bio), 4U);

  			sector &= ~(bio_sectors - 1);

  			if (sector < get_capacity(info->disk) &&

  			    drive->probed_capacity - sector < 4 * 75)

  				set_capacity(info->disk, sector);

  		}
  	}

  	ide_cd_log_error(drive->name, failed_command, sense);

  }

  static void cdrom_queue_request_sense(ide_drive_t *drive, void *sense,
  				      struct request *failed_command)
  {
  	struct cdrom_info *info		= drive->driver_data;
  	struct request *rq		= &info->request_sense_request;
  
  	if (sense == NULL)
  		sense = &info->sense_data;
  
  	/* stuff the sense request in front of our current request */

  	blk_rq_init(NULL, rq);
  	rq->cmd_type = REQ_TYPE_ATA_PC;
  	rq->rq_disk = info->disk;

  
  	rq->data = sense;
  	rq->cmd[0] = GPCMD_REQUEST_SENSE;

  	rq->cmd[4] = 18;
  	rq->data_len = 18;

  	rq->cmd_type = REQ_TYPE_SENSE;

  	rq->cmd_flags |= REQ_PREEMPT;

  
  	/* NOTE! Save the failed command in "rq->buffer" */
  	rq->buffer = (void *) failed_command;

  	ide_do_drive_cmd(drive, rq);

  }

  static void cdrom_end_request(ide_drive_t *drive, int uptodate)

  {
  	struct request *rq = HWGROUP(drive)->rq;
  	int nsectors = rq->hard_cur_sectors;

  	if (blk_sense_request(rq) && uptodate) {

  		/*

  		 * For REQ_TYPE_SENSE, "rq->buffer" points to the original
  		 * failed request

  		 */
  		struct request *failed = (struct request *) rq->buffer;
  		struct cdrom_info *info = drive->driver_data;
  		void *sense = &info->sense_data;
  		unsigned long flags;
  
  		if (failed) {
  			if (failed->sense) {
  				sense = failed->sense;
  				failed->sense_len = rq->sense_len;
  			}

  			cdrom_analyze_sense_data(drive, failed, sense);

  			/*

  			 * now end the failed request

  			 */

  			if (blk_fs_request(failed)) {
  				if (ide_end_dequeued_request(drive, failed, 0,
  						failed->hard_nr_sectors))
  					BUG();
  			} else {
  				spin_lock_irqsave(&ide_lock, flags);

  				if (__blk_end_request(failed, -EIO,
  						      failed->data_len))
  					BUG();

  				spin_unlock_irqrestore(&ide_lock, flags);
  			}
  		} else
  			cdrom_analyze_sense_data(drive, NULL, sense);

  	}
  
  	if (!rq->current_nr_sectors && blk_fs_request(rq))
  		uptodate = 1;
  	/* make sure it's fully ended */
  	if (blk_pc_request(rq))
  		nsectors = (rq->data_len + 511) >> 9;
  	if (!nsectors)
  		nsectors = 1;
  
  	ide_end_request(drive, uptodate, nsectors);
  }

  static void ide_dump_status_no_sense(ide_drive_t *drive, const char *msg, u8 st)

  {

  	if (st & 0x80)

  		return;

  	ide_dump_status(drive, msg, st);

  }

  /*
   * Returns:
   * 0: if the request should be continued.
   * 1: if the request was ended.
   */

  static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
  {

  	ide_hwif_t *hwif = drive->hwif;
  	struct request *rq = hwif->hwgroup->rq;

  	int stat, err, sense_key;

  	/* check for errors */

  	stat = hwif->tp_ops->read_status(hwif);

  	if (stat_ret)
  		*stat_ret = stat;
  
  	if (OK_STAT(stat, good_stat, BAD_R_STAT))
  		return 0;

  	/* get the IDE error register */

  	err = ide_read_error(drive);

  	sense_key = err >> 4;
  
  	if (rq == NULL) {

  		printk(KERN_ERR "%s: missing rq in %s
  ",
  				drive->name, __func__);

  		return 1;
  	}

  	if (blk_sense_request(rq)) {

  		/*
  		 * We got an error trying to get sense info from the drive
  		 * (probably while trying to recover from a former error).
  		 * Just give up.
  		 */

  		rq->cmd_flags |= REQ_FAILED;

  		cdrom_end_request(drive, 0);
  		ide_error(drive, "request sense failure", stat);
  		return 1;

  	} else if (blk_pc_request(rq) || rq->cmd_type == REQ_TYPE_ATA_PC) {

  		/* All other functions, except for READ. */

  
  		/*
  		 * if we have an error, pass back CHECK_CONDITION as the
  		 * scsi status byte
  		 */

  		if (blk_pc_request(rq) && !rq->errors)

  			rq->errors = SAM_STAT_CHECK_CONDITION;

  		/* check for tray open */

  		if (sense_key == NOT_READY) {

  			cdrom_saw_media_change(drive);

  		} else if (sense_key == UNIT_ATTENTION) {

  			/* check for media change */

  			cdrom_saw_media_change(drive);

  			return 0;

  		} else if (sense_key == ILLEGAL_REQUEST &&
  			   rq->cmd[0] == GPCMD_START_STOP_UNIT) {
  			/*
  			 * Don't print error message for this condition--
  			 * SFF8090i indicates that 5/24/00 is the correct
  			 * response to a request to close the tray if the
  			 * drive doesn't have that capability.
  			 * cdrom_log_sense() knows this!
  			 */

  		} else if (!(rq->cmd_flags & REQ_QUIET)) {

  			/* otherwise, print an error */

  			ide_dump_status(drive, "packet command error", stat);
  		}

  		rq->cmd_flags |= REQ_FAILED;

  
  		/*
  		 * instead of playing games with moving completions around,
  		 * remove failed request completely and end it when the
  		 * request sense has completed
  		 */

  		goto end_request;

  
  	} else if (blk_fs_request(rq)) {
  		int do_end_request = 0;

  		/* handle errors from READ and WRITE requests */

  
  		if (blk_noretry_request(rq))
  			do_end_request = 1;
  
  		if (sense_key == NOT_READY) {

  			/* tray open */

  			if (rq_data_dir(rq) == READ) {

  				cdrom_saw_media_change(drive);

  				/* fail the request */

  				printk(KERN_ERR "%s: tray open
  ", drive->name);

  				do_end_request = 1;
  			} else {
  				struct cdrom_info *info = drive->driver_data;

  				/*
  				 * Allow the drive 5 seconds to recover, some

  				 * devices will return this error while flushing

  				 * data from cache.
  				 */

  				if (!rq->errors)

  					info->write_timeout = jiffies +
  							ATAPI_WAIT_WRITE_BUSY;

  				rq->errors = 1;
  				if (time_after(jiffies, info->write_timeout))
  					do_end_request = 1;
  				else {
  					unsigned long flags;
  
  					/*

  					 * take a breather relying on the unplug
  					 * timer to kick us again

  					 */
  					spin_lock_irqsave(&ide_lock, flags);
  					blk_plug_device(drive->queue);

  					spin_unlock_irqrestore(&ide_lock,
  								flags);

  					return 1;
  				}
  			}
  		} else if (sense_key == UNIT_ATTENTION) {

  			/* media change */

  			cdrom_saw_media_change(drive);

  			/*

  			 * Arrange to retry the request but be sure to give up
  			 * if we've retried too many times.

  			 */

  			if (++rq->errors > ERROR_MAX)
  				do_end_request = 1;
  		} else if (sense_key == ILLEGAL_REQUEST ||
  			   sense_key == DATA_PROTECT) {

  			/*

  			 * No point in retrying after an illegal request or data
  			 * protect error.

  			 */
  			ide_dump_status_no_sense(drive, "command error", stat);

  			do_end_request = 1;
  		} else if (sense_key == MEDIUM_ERROR) {

  			/*
  			 * No point in re-trying a zillion times on a bad

  			 * sector. If we got here the error is not correctable.

  			 */

  			ide_dump_status_no_sense(drive,
  						 "media error (bad sector)",
  						 stat);

  			do_end_request = 1;
  		} else if (sense_key == BLANK_CHECK) {

  			/* disk appears blank ?? */

  			ide_dump_status_no_sense(drive, "media error (blank)",
  						 stat);

  			do_end_request = 1;

  		} else if ((err & ~ATA_ABORTED) != 0) {

  			/* go to the default handler for other errors */

  			ide_error(drive, "cdrom_decode_status", stat);
  			return 1;
  		} else if ((++rq->errors > ERROR_MAX)) {

  			/* we've racked up too many retries, abort */

  			do_end_request = 1;
  		}

  		/*
  		 * End a request through request sense analysis when we have
  		 * sense data. We need this in order to perform end of media
  		 * processing.
  		 */

  		if (do_end_request)
  			goto end_request;

  		/*

  		 * If we got a CHECK_CONDITION status, queue
  		 * a request sense command.

  		 */

  		if (stat & ATA_ERR)

  			cdrom_queue_request_sense(drive, NULL, NULL);

  	} else {
  		blk_dump_rq_flags(rq, "ide-cd: bad rq");
  		cdrom_end_request(drive, 0);
  	}

  	/* retry, or handle the next request */

  	return 1;

  
  end_request:

  	if (stat & ATA_ERR) {

  		unsigned long flags;
  
  		spin_lock_irqsave(&ide_lock, flags);
  		blkdev_dequeue_request(rq);
  		HWGROUP(drive)->rq = NULL;
  		spin_unlock_irqrestore(&ide_lock, flags);
  
  		cdrom_queue_request_sense(drive, rq->sense, rq);
  	} else
  		cdrom_end_request(drive, 0);
  
  	return 1;

  }
  
  static int cdrom_timer_expiry(ide_drive_t *drive)
  {
  	struct request *rq = HWGROUP(drive)->rq;
  	unsigned long wait = 0;
  
  	/*

  	 * Some commands are *slow* and normally take a long time to complete.
  	 * Usually we can use the ATAPI "disconnect" to bypass this, but not all
  	 * commands/drives support that. Let ide_timer_expiry keep polling us
  	 * for these.

  	 */
  	switch (rq->cmd[0]) {

  	case GPCMD_BLANK:
  	case GPCMD_FORMAT_UNIT:
  	case GPCMD_RESERVE_RZONE_TRACK:
  	case GPCMD_CLOSE_TRACK:
  	case GPCMD_FLUSH_CACHE:
  		wait = ATAPI_WAIT_PC;
  		break;
  	default:
  		if (!(rq->cmd_flags & REQ_QUIET))

  			printk(KERN_INFO "ide-cd: cmd 0x%x timed out
  ",
  					 rq->cmd[0]);

  		wait = 0;
  		break;

  	}
  	return wait;
  }

  /*
   * Set up the device registers for transferring a packet command on DEV,
   * expecting to later transfer XFERLEN bytes.  HANDLER is the routine
   * which actually transfers the command to the drive.  If this is a
   * drq_interrupt device, this routine will arrange for HANDLER to be
   * called when the interrupt from the drive arrives.  Otherwise, HANDLER
   * will be called immediately after the drive is prepared for the transfer.
   */

  static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
  						  int xferlen,
  						  ide_handler_t *handler)
  {

  	struct cdrom_info *info = drive->driver_data;
  	ide_hwif_t *hwif = drive->hwif;

  	/* FIXME: for Virtual DMA we must check harder */

  	if (info->dma)

  		info->dma = !hwif->dma_ops->dma_setup(drive);

  	/* set up the controller registers */

  	ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL,
  			   xferlen, info->dma);

  	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {

  		/* waiting for CDB interrupt, not DMA yet. */
  		if (info->dma)
  			drive->waiting_for_dma = 0;

  		/* packet command */

  		ide_execute_command(drive, ATA_CMD_PACKET, handler,

  				    ATAPI_WAIT_PC, cdrom_timer_expiry);

  		return ide_started;
  	} else {

  		ide_execute_pkt_cmd(drive);

  
  		return (*handler) (drive);
  	}
  }

  /*
   * Send a packet command to DRIVE described by CMD_BUF and CMD_LEN. The device
   * registers must have already been prepared by cdrom_start_packet_command.
   * HANDLER is the interrupt handler to call when the command completes or
   * there's data ready.
   */

  #define ATAPI_MIN_CDB_BYTES 12

  static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive,

  					  struct request *rq,
  					  ide_handler_t *handler)
  {
  	ide_hwif_t *hwif = drive->hwif;
  	int cmd_len;
  	struct cdrom_info *info = drive->driver_data;
  	ide_startstop_t startstop;

  	if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {

  		/*
  		 * Here we should have been called after receiving an interrupt
  		 * from the device.  DRQ should how be set.
  		 */

  		/* check for errors */

  		if (cdrom_decode_status(drive, ATA_DRQ, NULL))

  			return ide_stopped;

  		/* ok, next interrupt will be DMA interrupt */

  		if (info->dma)
  			drive->waiting_for_dma = 1;

  	} else {

  		/* otherwise, we must wait for DRQ to get set */

  		if (ide_wait_stat(&startstop, drive, ATA_DRQ,
  				  ATA_BUSY, WAIT_READY))

  			return startstop;
  	}

  	/* arm the interrupt handler */

  	ide_set_handler(drive, handler, rq->timeout, cdrom_timer_expiry);
  
  	/* ATAPI commands get padded out to 12 bytes minimum */
  	cmd_len = COMMAND_SIZE(rq->cmd[0]);
  	if (cmd_len < ATAPI_MIN_CDB_BYTES)
  		cmd_len = ATAPI_MIN_CDB_BYTES;

  	/* send the command to the device */

  	hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);

  	/* start the DMA if need be */

  	if (info->dma)

  		hwif->dma_ops->dma_start(drive);

  
  	return ide_started;
  }

  /*

   * Check the contents of the interrupt reason register from the cdrom
   * and attempt to recover if there are problems.  Returns  0 if everything's
   * ok; nonzero if the request has been terminated.
   */

  static int ide_cd_check_ireason(ide_drive_t *drive, struct request *rq,
  				int len, int ireason, int rw)

  {

  	ide_hwif_t *hwif = drive->hwif;

  	/*
  	 * ireason == 0: the drive wants to receive data from us
  	 * ireason == 2: the drive is expecting to transfer data to us
  	 */
  	if (ireason == (!rw << 1))

  		return 0;

  	else if (ireason == (rw << 1)) {

  		/* whoops... */

  		printk(KERN_ERR "%s: %s: wrong transfer direction!
  ",

  				drive->name, __func__);

  		ide_pad_transfer(drive, rw, len);

  	} else  if (rw == 0 && ireason == 1) {

  		/*
  		 * Some drives (ASUS) seem to tell us that status info is
  		 * available.  Just get it and ignore.

  		 */

  		(void)hwif->tp_ops->read_status(hwif);

  		return 0;
  	} else {

  		/* drive wants a command packet, or invalid ireason... */

  		printk(KERN_ERR "%s: %s: bad interrupt reason 0x%02x
  ",

  				drive->name, __func__, ireason);

  	}

  	if (rq->cmd_type == REQ_TYPE_ATA_PC)
  		rq->cmd_flags |= REQ_FAILED;

  	cdrom_end_request(drive, 0);
  	return -1;
  }
  
  /*

   * Assume that the drive will always provide data in multiples of at least
   * SECTOR_SIZE, as it gets hairy to keep track of the transfers otherwise.
   */
  static int ide_cd_check_transfer_size(ide_drive_t *drive, int len)
  {

  	if ((len % SECTOR_SIZE) == 0)
  		return 0;
  
  	printk(KERN_ERR "%s: %s: Bad transfer size %d
  ",

  			drive->name, __func__, len);

  	if (drive->atapi_flags & IDE_AFLAG_LIMIT_NFRAMES)

  		printk(KERN_ERR "  This drive is not supported by "
  				"this version of the driver
  ");
  	else {
  		printk(KERN_ERR "  Trying to limit transfer sizes
  ");

  		drive->atapi_flags |= IDE_AFLAG_LIMIT_NFRAMES;

  	}
  
  	return 1;
  }

  static ide_startstop_t cdrom_newpc_intr(ide_drive_t *);

  static ide_startstop_t ide_cd_prepare_rw_request(ide_drive_t *drive,
  						 struct request *rq)

  {

  	if (rq_data_dir(rq) == READ) {
  		unsigned short sectors_per_frame =
  			queue_hardsect_size(drive->queue) >> SECTOR_BITS;
  		int nskip = rq->sector & (sectors_per_frame - 1);

  		/*
  		 * If the requested sector doesn't start on a frame boundary,
  		 * we must adjust the start of the transfer so that it does,
  		 * and remember to skip the first few sectors.
  		 *
  		 * If the rq->current_nr_sectors field is larger than the size
  		 * of the buffer, it will mean that we're to skip a number of
  		 * sectors equal to the amount by which rq->current_nr_sectors
  		 * is larger than the buffer size.
  		 */
  		if (nskip > 0) {

  			/* sanity check... */

  			if (rq->current_nr_sectors !=
  			    bio_cur_sectors(rq->bio)) {
  				printk(KERN_ERR "%s: %s: buffer botch (%u)
  ",

  						drive->name, __func__,

  						rq->current_nr_sectors);
  				cdrom_end_request(drive, 0);
  				return ide_stopped;
  			}
  			rq->current_nr_sectors += nskip;

  		}

  	}

  #if 0
  	else
  		/* the immediate bit */
  		rq->cmd[1] = 1 << 3;
  #endif

  	/* set up the command */

  	rq->timeout = ATAPI_WAIT_PC;

  	return ide_started;
  }
  
  /*
   * Routine to send a read/write packet command to the drive. This is usually
   * called directly from cdrom_start_{read,write}(). However, for drq_interrupt
   * devices, it is called from an interrupt when the drive is ready to accept
   * the command.
   */
  static ide_startstop_t cdrom_start_rw_cont(ide_drive_t *drive)
  {
  	struct request *rq = drive->hwif->hwgroup->rq;

  	/* send the command to the drive and return */

  	return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);

  }

  #define IDECD_SEEK_THRESHOLD	(1000)			/* 1000 blocks */
  #define IDECD_SEEK_TIMER	(5 * WAIT_MIN_SLEEP)	/* 100 ms */
  #define IDECD_SEEK_TIMEOUT	(2 * WAIT_CMD)		/* 20 sec */

  static ide_startstop_t cdrom_seek_intr(ide_drive_t *drive)

  {
  	struct cdrom_info *info = drive->driver_data;
  	int stat;
  	static int retry = 10;
  
  	if (cdrom_decode_status(drive, 0, &stat))
  		return ide_stopped;

  	drive->atapi_flags |= IDE_AFLAG_SEEKING;

  
  	if (retry && time_after(jiffies, info->start_seek + IDECD_SEEK_TIMER)) {

  		if (--retry == 0)

  			drive->dsc_overlap = 0;

  	}
  	return ide_stopped;
  }

  static void ide_cd_prepare_seek_request(ide_drive_t *drive, struct request *rq)

  {

  	sector_t frame = rq->sector;
  
  	sector_div(frame, queue_hardsect_size(drive->queue) >> SECTOR_BITS);

  	memset(rq->cmd, 0, BLK_MAX_CDB);

  	rq->cmd[0] = GPCMD_SEEK;
  	put_unaligned(cpu_to_be32(frame), (unsigned int *) &rq->cmd[2]);
  
  	rq->timeout = ATAPI_WAIT_PC;

  }
  
  static ide_startstop_t cdrom_start_seek_continuation(ide_drive_t *drive)
  {
  	struct request *rq = drive->hwif->hwgroup->rq;

  	return cdrom_transfer_packet_command(drive, rq, &cdrom_seek_intr);
  }

  /*

   * Fix up a possibly partially-processed request so that we can start it over
   * entirely, or even put it back on the request queue.

   */
  static void restore_request(struct request *rq)

  {
  	if (rq->buffer != bio_data(rq->bio)) {

  		sector_t n =
  			(rq->buffer - (char *)bio_data(rq->bio)) / SECTOR_SIZE;

  
  		rq->buffer = bio_data(rq->bio);
  		rq->nr_sectors += n;
  		rq->sector -= n;
  	}

  	rq->current_nr_sectors = bio_cur_sectors(rq->bio);
  	rq->hard_cur_sectors = rq->current_nr_sectors;

  	rq->hard_nr_sectors = rq->nr_sectors;
  	rq->hard_sector = rq->sector;
  	rq->q->prep_rq_fn(rq->q, rq);
  }

  /*
   * All other packet commands.

   */

  static void ide_cd_request_sense_fixup(struct request *rq)
  {
  	/*
  	 * Some of the trailing request sense fields are optional,
  	 * and some drives don't send them.  Sigh.
  	 */
  	if (rq->cmd[0] == GPCMD_REQUEST_SENSE &&
  	    rq->data_len > 0 && rq->data_len <= 5)
  		while (rq->data_len > 0) {
  			*(u8 *)rq->data++ = 0;
  			--rq->data_len;
  		}
  }

  int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
  		    int write, void *buffer, unsigned *bufflen,
  		    struct request_sense *sense, int timeout,
  		    unsigned int cmd_flags)

  {

  	struct cdrom_info *info = drive->driver_data;
  	struct request_sense local_sense;

  	int retries = 10;

  	unsigned int flags = 0;

  	if (!sense)
  		sense = &local_sense;

  	/* start of retry loop */

  	do {

  		struct request *rq;

  		int error;

  		rq = blk_get_request(drive->queue, write, __GFP_WAIT);
  
  		memcpy(rq->cmd, cmd, BLK_MAX_CDB);
  		rq->cmd_type = REQ_TYPE_ATA_PC;
  		rq->sense = sense;
  		rq->cmd_flags |= cmd_flags;
  		rq->timeout = timeout;
  		if (buffer) {
  			rq->data = buffer;
  			rq->data_len = *bufflen;
  		}
  
  		error = blk_execute_rq(drive->queue, info->disk, rq, 0);
  
  		if (buffer)
  			*bufflen = rq->data_len;
  
  		flags = rq->cmd_flags;
  		blk_put_request(rq);

  		/*
  		 * FIXME: we should probably abort/retry or something in case of
  		 * failure.
  		 */

  		if (flags & REQ_FAILED) {

  			/*
  			 * The request failed.  Retry if it was due to a unit
  			 * attention status (usually means media was changed).
  			 */

  			struct request_sense *reqbuf = sense;

  
  			if (reqbuf->sense_key == UNIT_ATTENTION)
  				cdrom_saw_media_change(drive);
  			else if (reqbuf->sense_key == NOT_READY &&
  				 reqbuf->asc == 4 && reqbuf->ascq != 4) {

  				/*
  				 * The drive is in the process of loading
  				 * a disk.  Retry, but wait a little to give
  				 * the drive time to complete the load.
  				 */

  				ssleep(2);
  			} else {

  				/* otherwise, don't retry */

  				retries = 0;
  			}
  			--retries;
  		}

  		/* end of retry loop */

  	} while ((flags & REQ_FAILED) && retries >= 0);

  	/* return an error if the command failed */

  	return (flags & REQ_FAILED) ? -EIO : 0;

  }
  
  /*

   * Called from blk_end_request_callback() after the data of the request is
   * completed and before the request itself is completed. By returning value '1',
   * blk_end_request_callback() returns immediately without completing it.

   */
  static int cdrom_newpc_intr_dummy_cb(struct request *rq)
  {
  	return 1;
  }

  static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
  {

  	ide_hwif_t *hwif = drive->hwif;

  	struct cdrom_info *info = drive->driver_data;
  	struct request *rq = HWGROUP(drive)->rq;

  	xfer_func_t *xferfunc;

  	ide_expiry_t *expiry = NULL;

  	int dma_error = 0, dma, stat, thislen, uptodate = 0;

  	int write = (rq_data_dir(rq) == WRITE) ? 1 : 0;
  	unsigned int timeout;

  	u16 len;
  	u8 ireason;

  	/* check for errors */

  	dma = info->dma;
  	if (dma) {
  		info->dma = 0;

  		dma_error = hwif->dma_ops->dma_end(drive);

  		if (dma_error) {
  			printk(KERN_ERR "%s: DMA %s error
  ", drive->name,

  					write ? "write" : "read");

  			ide_dma_off(drive);
  		}

  	}
  
  	if (cdrom_decode_status(drive, 0, &stat))
  		return ide_stopped;

  	/* using dma, transfer is complete now */

  	if (dma) {

  		if (dma_error)

  			return ide_error(drive, "dma error", stat);

  		if (blk_fs_request(rq)) {
  			ide_end_request(drive, 1, rq->nr_sectors);
  			return ide_stopped;
  		}

  		goto end_request;

  	}

  	ide_read_bcount_and_ireason(drive, &len, &ireason);

  
  	thislen = blk_fs_request(rq) ? len : rq->data_len;

  	if (thislen > len)
  		thislen = len;

  	/* If DRQ is clear, the command has completed. */

  	if ((stat & ATA_DRQ) == 0) {

  		if (blk_fs_request(rq)) {
  			/*
  			 * If we're not done reading/writing, complain.
  			 * Otherwise, complete the command normally.
  			 */
  			uptodate = 1;
  			if (rq->current_nr_sectors > 0) {
  				printk(KERN_ERR "%s: %s: data underrun "
  						"(%d blocks)
  ",

  						drive->name, __func__,

  						rq->current_nr_sectors);
  				if (!write)
  					rq->cmd_flags |= REQ_FAILED;
  				uptodate = 0;
  			}
  			cdrom_end_request(drive, uptodate);
  			return ide_stopped;
  		} else if (!blk_pc_request(rq)) {

  			ide_cd_request_sense_fixup(rq);

  			/* complain if we still have data left to transfer */

  			uptodate = rq->data_len ? 0 : 1;
  		}
  		goto end_request;

  	}

  	/* check which way to transfer data */

  	if (ide_cd_check_ireason(drive, rq, len, ireason, write))
  		return ide_stopped;

  	if (blk_fs_request(rq)) {
  		if (write == 0) {

  			int nskip;
  
  			if (ide_cd_check_transfer_size(drive, len)) {
  				cdrom_end_request(drive, 0);
  				return ide_stopped;
  			}
  
  			/*
  			 * First, figure out if we need to bit-bucket
  			 * any of the leading sectors.
  			 */
  			nskip = min_t(int, rq->current_nr_sectors
  					   - bio_cur_sectors(rq->bio),
  					   thislen >> 9);
  			if (nskip > 0) {

  				ide_pad_transfer(drive, write, nskip << 9);

  				rq->current_nr_sectors -= nskip;
  				thislen -= (nskip << 9);
  			}
  		}

  	}

  	if (ireason == 0) {
  		write = 1;

  		xferfunc = hwif->tp_ops->output_data;

  	} else {

  		write = 0;

  		xferfunc = hwif->tp_ops->input_data;

  	}

  	/* transfer data */

  	while (thislen > 0) {

  		u8 *ptr = blk_fs_request(rq) ? NULL : rq->data;

  		int blen = rq->data_len;

  		/* bio backed? */

  		if (rq->bio) {

  			if (blk_fs_request(rq)) {
  				ptr = rq->buffer;
  				blen = rq->current_nr_sectors << 9;
  			} else {
  				ptr = bio_data(rq->bio);
  				blen = bio_iovec(rq->bio)->bv_len;
  			}

  		}
  
  		if (!ptr) {

  			if (blk_fs_request(rq) && !write)
  				/*

  				 * If the buffers are full, pipe the rest into

  				 * oblivion.
  				 */

  				ide_pad_transfer(drive, 0, thislen);

  			else {
  				printk(KERN_ERR "%s: confused, missing data
  ",
  						drive->name);
  				blk_dump_rq_flags(rq, rq_data_dir(rq)
  						  ? "cdrom_newpc_intr, write"
  						  : "cdrom_newpc_intr, read");
  			}

  			break;
  		}
  
  		if (blen > thislen)
  			blen = thislen;

  		xferfunc(drive, NULL, ptr, blen);

  
  		thislen -= blen;
  		len -= blen;

  		if (blk_fs_request(rq)) {
  			rq->buffer += blen;
  			rq->nr_sectors -= (blen >> 9);
  			rq->current_nr_sectors -= (blen >> 9);
  			rq->sector += (blen >> 9);
  
  			if (rq->current_nr_sectors == 0 && rq->nr_sectors)
  				cdrom_end_request(drive, 1);
  		} else {
  			rq->data_len -= blen;

  			/*
  			 * The request can't be completed until DRQ is cleared.
  			 * So complete the data, but don't complete the request
  			 * using the dummy function for the callback feature
  			 * of blk_end_request_callback().
  			 */

  			if (rq->bio)
  				blk_end_request_callback(rq, 0, blen,

  						 cdrom_newpc_intr_dummy_cb);

  			else
  				rq->data += blen;
  		}

  		if (!write && blk_sense_request(rq))
  			rq->sense_len += blen;

  	}

  	/* pad, if necessary */

  	if (!blk_fs_request(rq) && len > 0)

  		ide_pad_transfer(drive, write, len);

  	if (blk_pc_request(rq)) {
  		timeout = rq->timeout;

  	} else {
  		timeout = ATAPI_WAIT_PC;

  		if (!blk_fs_request(rq))
  			expiry = cdrom_timer_expiry;

  	}
  
  	ide_set_handler(drive, cdrom_newpc_intr, timeout, expiry);

  	return ide_started;

  
  end_request:
  	if (blk_pc_request(rq)) {
  		unsigned long flags;

  		unsigned int dlen = rq->data_len;
  
  		if (dma)
  			rq->data_len = 0;

  
  		spin_lock_irqsave(&ide_lock, flags);

  		if (__blk_end_request(rq, 0, dlen))

  			BUG();
  		HWGROUP(drive)->rq = NULL;
  		spin_unlock_irqrestore(&ide_lock, flags);
  	} else {
  		if (!uptodate)
  			rq->cmd_flags |= REQ_FAILED;
  		cdrom_end_request(drive, uptodate);
  	}
  	return ide_stopped;

  }

  static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)

  {

  	struct cdrom_info *cd = drive->driver_data;
  	int write = rq_data_dir(rq) == WRITE;
  	unsigned short sectors_per_frame =
  		queue_hardsect_size(drive->queue) >> SECTOR_BITS;

  	if (write) {

  		/* disk has become write protected */

  		if (get_disk_ro(cd->disk)) {

  			cdrom_end_request(drive, 0);
  			return ide_stopped;
  		}
  	} else {
  		/*
  		 * We may be retrying this request after an error.  Fix up any
  		 * weirdness which might be present in the request packet.
  		 */
  		restore_request(rq);

  	}

  	/* use DMA, if possible / writes *must* be hardware frame aligned */

  	if ((rq->nr_sectors & (sectors_per_frame - 1)) ||
  	    (rq->sector & (sectors_per_frame - 1))) {
  		if (write) {
  			cdrom_end_request(drive, 0);
  			return ide_stopped;
  		}
  		cd->dma = 0;
  	} else
  		cd->dma = drive->using_dma;

  	if (write)
  		cd->devinfo.media_written = 1;

  	return ide_started;

  }
  
  static ide_startstop_t cdrom_do_newpc_cont(ide_drive_t *drive)
  {
  	struct request *rq = HWGROUP(drive)->rq;

  	return cdrom_transfer_packet_command(drive, rq, cdrom_newpc_intr);
  }

  static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)

  {
  	struct cdrom_info *info = drive->driver_data;

  	if (blk_pc_request(rq))
  		rq->cmd_flags |= REQ_QUIET;
  	else
  		rq->cmd_flags &= ~REQ_FAILED;

  
  	info->dma = 0;

  	/* sg request */

  	if (rq->bio || ((rq->cmd_type == REQ_TYPE_ATA_PC) && rq->data_len)) {
  		struct request_queue *q = drive->queue;
  		unsigned int alignment;

  		char *buf;

  		if (rq->bio)

  			buf = bio_data(rq->bio);

  		else

  			buf = rq->data;

  		info->dma = drive->using_dma;
  
  		/*
  		 * check if dma is safe

  		 *
  		 * NOTE! The "len" and "addr" checks should possibly have
  		 * separate masks.

  		 */

  		alignment = queue_dma_alignment(q) | q->dma_pad_mask;

  		if ((unsigned long)buf & alignment || rq->data_len & alignment
  		    || object_is_on_stack(buf))

  			info->dma = 0;

  	}

  }

  /*

   * cdrom driver request routine.
   */

  static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,

  					sector_t block)

  {

  	struct cdrom_info *info = drive->driver_data;

  	ide_handler_t *fn;
  	int xferlen;

  
  	if (blk_fs_request(rq)) {

  		if (drive->atapi_flags & IDE_AFLAG_SEEKING) {

  			ide_hwif_t *hwif = drive->hwif;

  			unsigned long elapsed = jiffies - info->start_seek;

  			int stat = hwif->tp_ops->read_status(hwif);

  			if ((stat & ATA_DSC) != ATA_DSC) {

  				if (elapsed < IDECD_SEEK_TIMEOUT) {

  					ide_stall_queue(drive,
  							IDECD_SEEK_TIMER);

  					return ide_stopped;
  				}

  				printk(KERN_ERR "%s: DSC timeout
  ",
  						drive->name);

  			}

  			drive->atapi_flags &= ~IDE_AFLAG_SEEKING;

  		}

  		if (rq_data_dir(rq) == READ &&
  		    IDE_LARGE_SEEK(info->last_block, block,

  			    IDECD_SEEK_THRESHOLD) &&
  		    drive->dsc_overlap) {
  			xferlen = 0;
  			fn = cdrom_start_seek_continuation;

  			info->dma = 0;
  			info->start_seek = jiffies;

  
  			ide_cd_prepare_seek_request(drive, rq);

  		} else {
  			xferlen = 32768;
  			fn = cdrom_start_rw_cont;

  			if (cdrom_start_rw(drive, rq) == ide_stopped)
  				return ide_stopped;

  
  			if (ide_cd_prepare_rw_request(drive, rq) == ide_stopped)
  				return ide_stopped;

  		}

  		info->last_block = block;

  	} else if (blk_sense_request(rq) || blk_pc_request(rq) ||

  		   rq->cmd_type == REQ_TYPE_ATA_PC) {

  		xferlen = rq->data_len;
  		fn = cdrom_do_newpc_cont;

  
  		if (!rq->timeout)
  			rq->timeout = ATAPI_WAIT_PC;

  		cdrom_do_block_pc(drive, rq);

  	} else if (blk_special_request(rq)) {

  		/* right now this can only be a reset... */

  		cdrom_end_request(drive, 1);
  		return ide_stopped;

  	} else {
  		blk_dump_rq_flags(rq, "ide-cd bad flags");
  		cdrom_end_request(drive, 0);
  		return ide_stopped;

  	}

  
  	return cdrom_start_packet_command(drive, xferlen, fn);

  }

  /*

   * Ioctl handling.
   *

   * Routines which queue packet commands take as a final argument a pointer to a
   * request_sense struct. If execution of the command results in an error with a
   * CHECK CONDITION status, this structure will be filled with the results of the
   * subsequent request sense command. The pointer can also be NULL, in which case
   * no sense information is returned.

   */

  static void msf_from_bcd(struct atapi_msf *msf)

  {

  	msf->minute = bcd2bin(msf->minute);
  	msf->second = bcd2bin(msf->second);
  	msf->frame  = bcd2bin(msf->frame);

  }

  int cdrom_check_status(ide_drive_t *drive, struct request_sense *sense)

  {

  	struct cdrom_info *info = drive->driver_data;
  	struct cdrom_device_info *cdi = &info->devinfo;

  	unsigned char cmd[BLK_MAX_CDB];

  	memset(cmd, 0, BLK_MAX_CDB);
  	cmd[0] = GPCMD_TEST_UNIT_READY;

  	/*

  	 * Sanyo 3 CD changer uses byte 7 of TEST_UNIT_READY to switch CDs
  	 * instead of supporting the LOAD_UNLOAD opcode.

  	 */

  	cmd[7] = cdi->sanyo_slot % 3;

  	return ide_cd_queue_pc(drive, cmd, 0, NULL, NULL, sense, 0, REQ_QUIET);

  }

  static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
  			       unsigned long *sectors_per_frame,
  			       struct request_sense *sense)
  {
  	struct {

  		__be32 lba;
  		__be32 blocklen;

  	} capbuf;
  
  	int stat;

  	unsigned char cmd[BLK_MAX_CDB];
  	unsigned len = sizeof(capbuf);

  	u32 blocklen;

  	memset(cmd, 0, BLK_MAX_CDB);
  	cmd[0] = GPCMD_READ_CDVD_CAPACITY;

  	stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, sense, 0,
  			       REQ_QUIET);

  	if (stat)
  		return stat;
  
  	/*
  	 * Sanity check the given block size
  	 */

  	blocklen = be32_to_cpu(capbuf.blocklen);
  	switch (blocklen) {
  	case 512:
  	case 1024:
  	case 2048:
  	case 4096:

  		break;
  	default:
  		printk(KERN_ERR "%s: weird block size %u
  ",

  			drive->name, blocklen);

  		printk(KERN_ERR "%s: default to 2kb block size
  ",
  			drive->name);

  		blocklen = 2048;

  		break;

  	}

  	*capacity = 1 + be32_to_cpu(capbuf.lba);

  	*sectors_per_frame = blocklen >> SECTOR_BITS;

  	return 0;

  }
  
  static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
  				int format, char *buf, int buflen,
  				struct request_sense *sense)
  {

  	unsigned char cmd[BLK_MAX_CDB];

  	memset(cmd, 0, BLK_MAX_CDB);

  	cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
  	cmd[6] = trackno;
  	cmd[7] = (buflen >> 8);
  	cmd[8] = (buflen & 0xff);
  	cmd[9] = (format << 6);

  
  	if (msf_flag)

  		cmd[1] = 2;

  	return ide_cd_queue_pc(drive, cmd, 0, buf, &buflen, sense, 0, REQ_QUIET);

  }

  /* Try to read the entire TOC for the disk into our internal buffer. */

  int ide_cd_read_toc(ide_drive_t *drive, struct request_sense *sense)

  {
  	int stat, ntracks, i;
  	struct cdrom_info *info = drive->driver_data;
  	struct cdrom_device_info *cdi = &info->devinfo;
  	struct atapi_toc *toc = info->toc;
  	struct {
  		struct atapi_toc_header hdr;
  		struct atapi_toc_entry  ent;
  	} ms_tmp;
  	long last_written;
  	unsigned long sectors_per_frame = SECTORS_PER_FRAME;
  
  	if (toc == NULL) {

  		/* try to allocate space */

  		toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);

  		if (toc == NULL) {

  			printk(KERN_ERR "%s: No cdrom TOC buffer!
  ",
  					drive->name);

  			return -ENOMEM;
  		}

  		info->toc = toc;

  	}

  	/*
  	 * Check to see if the existing data is still valid. If it is,
  	 * just return.
  	 */

  	(void) cdrom_check_status(drive, sense);

  	if (drive->atapi_flags & IDE_AFLAG_TOC_VALID)

  		return 0;

  	/* try to get the total cdrom capacity and sector size */

  	stat = cdrom_read_capacity(drive, &toc->capacity, &sectors_per_frame,
  				   sense);
  	if (stat)
  		toc->capacity = 0x1fffff;
  
  	set_capacity(info->disk, toc->capacity * sectors_per_frame);

  	/* save a private copy of the TOC capacity for error handling */

  	drive->probed_capacity = toc->capacity * sectors_per_frame;

  	blk_queue_hardsect_size(drive->queue,
  				sectors_per_frame << SECTOR_BITS);

  	/* first read just the header, so we know how long the TOC is */

  	stat = cdrom_read_tocentry(drive, 0, 1, 0, (char *) &toc->hdr,
  				    sizeof(struct atapi_toc_header), sense);

  	if (stat)
  		return stat;

  	if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {

  		toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
  		toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);

  	}

  
  	ntracks = toc->hdr.last_track - toc->hdr.first_track + 1;
  	if (ntracks <= 0)
  		return -EIO;
  	if (ntracks > MAX_TRACKS)
  		ntracks = MAX_TRACKS;

  	/* now read the whole schmeer */

  	stat = cdrom_read_tocentry(drive, toc->hdr.first_track, 1, 0,
  				  (char *)&toc->hdr,
  				   sizeof(struct atapi_toc_header) +
  				   (ntracks + 1) *
  				   sizeof(struct atapi_toc_entry), sense);
  
  	if (stat && toc->hdr.first_track > 1) {

  		/*
  		 * Cds with CDI tracks only don't have any TOC entries, despite
  		 * of this the returned values are
  		 * first_track == last_track = number of CDI tracks + 1,
  		 * so that this case is indistinguishable from the same layout
  		 * plus an additional audio track. If we get an error for the
  		 * regular case, we assume a CDI without additional audio
  		 * tracks. In this case the readable TOC is empty (CDI tracks
  		 * are not included) and only holds the Leadout entry.
  		 *
  		 * Heiko Eißfeldt.
  		 */

  		ntracks = 0;
  		stat = cdrom_read_tocentry(drive, CDROM_LEADOUT, 1, 0,
  					   (char *)&toc->hdr,
  					   sizeof(struct atapi_toc_header) +
  					   (ntracks + 1) *
  					   sizeof(struct atapi_toc_entry),
  					   sense);

  		if (stat)

  			return stat;

  		if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {

  			toc->hdr.first_track = (u8)bin2bcd(CDROM_LEADOUT);
  			toc->hdr.last_track = (u8)bin2bcd(CDROM_LEADOUT);

  		} else {

  			toc->hdr.first_track = CDROM_LEADOUT;
  			toc->hdr.last_track = CDROM_LEADOUT;
  		}
  	}
  
  	if (stat)
  		return stat;

  	toc->hdr.toc_length = be16_to_cpu(toc->hdr.toc_length);

  	if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD) {

  		toc->hdr.first_track = bcd2bin(toc->hdr.first_track);
  		toc->hdr.last_track  = bcd2bin(toc->hdr.last_track);

  	}

  	for (i = 0; i <= ntracks; i++) {

  		if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {
  			if (drive->atapi_flags & IDE_AFLAG_TOCTRACKS_AS_BCD)

  				toc->ent[i].track = bcd2bin(toc->ent[i].track);

  			msf_from_bcd(&toc->ent[i].addr.msf);
  		}

  		toc->ent[i].addr.lba = msf_to_lba(toc->ent[i].addr.msf.minute,
  						  toc->ent[i].addr.msf.second,
  						  toc->ent[i].addr.msf.frame);

  	}

  	if (toc->hdr.first_track != CDROM_LEADOUT) {

  		/* read the multisession information */

  		stat = cdrom_read_tocentry(drive, 0, 0, 1, (char *)&ms_tmp,
  					   sizeof(ms_tmp), sense);

  		if (stat)
  			return stat;

  
  		toc->last_session_lba = be32_to_cpu(ms_tmp.ent.addr.lba);
  	} else {

  		ms_tmp.hdr.last_track = CDROM_LEADOUT;
  		ms_tmp.hdr.first_track = ms_tmp.hdr.last_track;

  		toc->last_session_lba = msf_to_lba(0, 2, 0); /* 0m 2s 0f */
  	}

  	if (drive->atapi_flags & IDE_AFLAG_TOCADDR_AS_BCD) {

  		/* re-read multisession information using MSF format */

  		stat = cdrom_read_tocentry(drive, 0, 1, 1, (char *)&ms_tmp,
  					   sizeof(ms_tmp), sense);
  		if (stat)
  			return stat;

  		msf_from_bcd(&ms_tmp.ent.addr.msf);