Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1813 insertions, 0 deletions

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
new file mode 100644
index 000000000..f9b59d418
--- /dev/null
+++ b/drivers/ide/ide-cd.c
@@ -0,0 +1,1813 @@
+/*
+ * 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, 2007-2009  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. ;-)
+ *
+ * Documentation:
+ *	Mt. Fuji (SFF8090 version 4) and ATAPI (SFF-8020i rev 2.6) standards.
+ *
+ * For historical changelog please see:
+ *	Documentation/ide/ChangeLog.ide-cd.1994-2004
+ */
+
+#define DRV_NAME "ide-cd"
+#define PFX DRV_NAME ": "
+
+#define IDECD_VERSION "5.00"
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched/task_stack.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/seq_file.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/io.h>
+#include <asm/byteorder.h>
+#include <linux/uaccess.h>
+#include <asm/unaligned.h>
+
+#include "ide-cd.h"
+
+static DEFINE_MUTEX(ide_cd_mutex);
+static DEFINE_MUTEX(idecd_ref_mutex);
+
+static void ide_cd_release(struct device *);
+
+static struct cdrom_info *ide_cd_get(struct gendisk *disk)
+{
+	struct cdrom_info *cd = NULL;
+
+	mutex_lock(&idecd_ref_mutex);
+	cd = ide_drv_g(disk, cdrom_info);
+	if (cd) {
+		if (ide_device_get(cd->drive))
+			cd = NULL;
+		else
+			get_device(&cd->dev);
+
+	}
+	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);
+	put_device(&cd->dev);
+	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->dev_flags |= IDE_DFLAG_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 = &drive->sense_data;
+	int log = 0;
+
+	if (!sense || !rq || (rq->rq_flags & RQF_QUIET))
+		return 0;
+
+	ide_debug_log(IDE_DBG_SENSE, "sense_key: 0x%x", sense->sense_key);
+
+	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 (scsi_req(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 = &drive->sense_data;
+	struct cdrom_info *info = drive->driver_data;
+	unsigned long sector;
+	unsigned long bio_sectors;
+
+	ide_debug_log(IDE_DBG_SENSE, "error_code: 0x%x, sense_key: 0x%x",
+				     sense->error_code, sense->sense_key);
+
+	if (failed_command)
+		ide_debug_log(IDE_DBG_SENSE, "failed cmd: 0x%x",
+					     failed_command->cmd[0]);
+
+	if (!cdrom_log_sense(drive, failed_command))
+		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 && scsi_req(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_rq_is_passthrough(failed_command))
+				break;
+			sector = (sense->information[0] << 24) |
+				 (sense->information[1] << 16) |
+				 (sense->information[2] <<  8) |
+				 (sense->information[3]);
+
+			if (queue_logical_block_size(drive->queue) == 2048)
+				/* device sector size is 2K */
+				sector <<= 2;
+
+			bio_sectors = max(bio_sectors(failed_command->bio), 4U);
+			sector &= ~(bio_sectors - 1);
+
+			/*
+			 * The SCSI specification allows for the value
+			 * returned by READ CAPACITY to be up to 75 2K
+			 * sectors past the last readable block.
+			 * Therefore, if we hit a medium error within the
+			 * last 75 2K sectors, we decrease the saved size
+			 * value.
+			 */
+			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 ide_cd_complete_failed_rq(ide_drive_t *drive, struct request *rq)
+{
+	/*
+	 * For ATA_PRIV_SENSE, "rq->special" points to the original
+	 * failed request.  Also, the sense data should be read
+	 * directly from rq which might be different from the original
+	 * sense buffer if it got copied during mapping.
+	 */
+	struct request *failed = (struct request *)rq->special;
+	void *sense = bio_data(rq->bio);
+
+	if (failed) {
+		/*
+		 * Sense is always read into drive->sense_data, copy back to the
+		 * original request.
+		 */
+		memcpy(scsi_req(failed)->sense, sense, 18);
+		scsi_req(failed)->sense_len = scsi_req(rq)->sense_len;
+		cdrom_analyze_sense_data(drive, failed);
+
+		if (ide_end_rq(drive, failed, BLK_STS_IOERR, blk_rq_bytes(failed)))
+			BUG();
+	} else
+		cdrom_analyze_sense_data(drive, NULL);
+}
+
+
+/*
+ * Allow the drive 5 seconds to recover; some devices will return NOT_READY
+ * while flushing data from cache.
+ *
+ * returns: 0 failed (write timeout expired)
+ *	    1 success
+ */
+static int ide_cd_breathe(ide_drive_t *drive, struct request *rq)
+{
+
+	struct cdrom_info *info = drive->driver_data;
+
+	if (!scsi_req(rq)->result)
+		info->write_timeout = jiffies +	ATAPI_WAIT_WRITE_BUSY;
+
+	scsi_req(rq)->result = 1;
+
+	if (time_after(jiffies, info->write_timeout))
+		return 0;
+	else {
+		/*
+		 * take a breather
+		 */
+		blk_delay_queue(drive->queue, 1);
+		return 1;
+	}
+}
+
+/**
+ * Returns:
+ * 0: if the request should be continued.
+ * 1: if the request will be going through error recovery.
+ * 2: if the request should be ended.
+ */
+static int cdrom_decode_status(ide_drive_t *drive, u8 stat)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct request *rq = hwif->rq;
+	int err, sense_key, do_end_request = 0;
+
+	/* get the IDE error register */
+	err = ide_read_error(drive);
+	sense_key = err >> 4;
+
+	ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, rq->cmd_type: 0x%x, err: 0x%x, "
+				  "stat 0x%x",
+				  rq->cmd[0], rq->cmd_type, err, stat);
+
+	if (ata_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->rq_flags |= RQF_FAILED;
+		return 2;
+	}
+
+	/* if we have an error, pass CHECK_CONDITION as the SCSI status byte */
+	if (blk_rq_is_scsi(rq) && !scsi_req(rq)->result)
+		scsi_req(rq)->result = SAM_STAT_CHECK_CONDITION;
+
+	if (blk_noretry_request(rq))
+		do_end_request = 1;
+
+	switch (sense_key) {
+	case NOT_READY:
+		if (req_op(rq) == REQ_OP_WRITE) {
+			if (ide_cd_breathe(drive, rq))
+				return 1;
+		} else {
+			cdrom_saw_media_change(drive);
+
+			if (!blk_rq_is_passthrough(rq) &&
+			    !(rq->rq_flags & RQF_QUIET))
+				printk(KERN_ERR PFX "%s: tray open\n",
+					drive->name);
+		}
+		do_end_request = 1;
+		break;
+	case UNIT_ATTENTION:
+		cdrom_saw_media_change(drive);
+
+		if (blk_rq_is_passthrough(rq))
+			return 0;
+
+		/*
+		 * Arrange to retry the request but be sure to give up if we've
+		 * retried too many times.
+		 */
+		if (++scsi_req(rq)->result > ERROR_MAX)
+			do_end_request = 1;
+		break;
+	case ILLEGAL_REQUEST:
+		/*
+		 * 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!
+		 */
+		if (scsi_req(rq)->cmd[0] == GPCMD_START_STOP_UNIT)
+			break;
+		/* fall-through */
+	case DATA_PROTECT:
+		/*
+		 * No point in retrying after an illegal request or data
+		 * protect error.
+		 */
+		if (!(rq->rq_flags & RQF_QUIET))
+			ide_dump_status(drive, "command error", stat);
+		do_end_request = 1;
+		break;
+	case MEDIUM_ERROR:
+		/*
+		 * No point in re-trying a zillion times on a bad sector.
+		 * If we got here the error is not correctable.
+		 */
+		if (!(rq->rq_flags & RQF_QUIET))
+			ide_dump_status(drive, "media error "
+					"(bad sector)", stat);
+		do_end_request = 1;
+		break;
+	case BLANK_CHECK:
+		/* disk appears blank? */
+		if (!(rq->rq_flags & RQF_QUIET))
+			ide_dump_status(drive, "media error (blank)",
+					stat);
+		do_end_request = 1;
+		break;
+	default:
+		if (blk_rq_is_passthrough(rq))
+			break;
+		if (err & ~ATA_ABORTED) {
+			/* go to the default handler for other errors */
+			ide_error(drive, "cdrom_decode_status", stat);
+			return 1;
+		} else if (++scsi_req(rq)->result > ERROR_MAX)
+			/* we've racked up too many retries, abort */
+			do_end_request = 1;
+	}
+
+	if (blk_rq_is_passthrough(rq)) {
+		rq->rq_flags |= RQF_FAILED;
+		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)
+		return ide_queue_sense_rq(drive, NULL) ? 2 : 1;
+	return 1;
+
+end_request:
+	if (stat & ATA_ERR) {
+		hwif->rq = NULL;
+		return ide_queue_sense_rq(drive, rq) ? 2 : 1;
+	} else
+		return 2;
+}
+
+static void ide_cd_request_sense_fixup(ide_drive_t *drive, struct ide_cmd *cmd)
+{
+	struct request *rq = cmd->rq;
+
+	ide_debug_log(IDE_DBG_FUNC, "rq->cmd[0]: 0x%x", rq->cmd[0]);
+
+	/*
+	 * Some of the trailing request sense fields are optional,
+	 * and some drives don't send them.  Sigh.
+	 */
+	if (scsi_req(rq)->cmd[0] == GPCMD_REQUEST_SENSE &&
+	    cmd->nleft > 0 && cmd->nleft <= 5)
+		cmd->nleft = 0;
+}
+
+int ide_cd_queue_pc(ide_drive_t *drive, const unsigned char *cmd,
+		    int write, void *buffer, unsigned *bufflen,
+		    struct scsi_sense_hdr *sshdr, int timeout,
+		    req_flags_t rq_flags)
+{
+	struct cdrom_info *info = drive->driver_data;
+	struct scsi_sense_hdr local_sshdr;
+	int retries = 10;
+	bool failed;
+
+	ide_debug_log(IDE_DBG_PC, "cmd[0]: 0x%x, write: 0x%x, timeout: %d, "
+				  "rq_flags: 0x%x",
+				  cmd[0], write, timeout, rq_flags);
+
+	if (!sshdr)
+		sshdr = &local_sshdr;
+
+	/* start of retry loop */
+	do {
+		struct request *rq;
+		int error;
+		bool delay = false;
+
+		rq = blk_get_request(drive->queue,
+			write ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
+		memcpy(scsi_req(rq)->cmd, cmd, BLK_MAX_CDB);
+		ide_req(rq)->type = ATA_PRIV_PC;
+		rq->rq_flags |= rq_flags;
+		rq->timeout = timeout;
+		if (buffer) {
+			error = blk_rq_map_kern(drive->queue, rq, buffer,
+						*bufflen, GFP_NOIO);
+			if (error) {
+				blk_put_request(rq);
+				return error;
+			}
+		}
+
+		blk_execute_rq(drive->queue, info->disk, rq, 0);
+		error = scsi_req(rq)->result ? -EIO : 0;
+
+		if (buffer)
+			*bufflen = scsi_req(rq)->resid_len;
+		scsi_normalize_sense(scsi_req(rq)->sense,
+				     scsi_req(rq)->sense_len, sshdr);
+
+		/*
+		 * FIXME: we should probably abort/retry or something in case of
+		 * failure.
+		 */
+		failed = (rq->rq_flags & RQF_FAILED) != 0;
+		if (failed) {
+			/*
+			 * The request failed.  Retry if it was due to a unit
+			 * attention status (usually means media was changed).
+			 */
+			if (sshdr->sense_key == UNIT_ATTENTION)
+				cdrom_saw_media_change(drive);
+			else if (sshdr->sense_key == NOT_READY &&
+				 sshdr->asc == 4 && sshdr->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.
+				 */
+				delay = true;
+			} else {
+				/* otherwise, don't retry */
+				retries = 0;
+			}
+			--retries;
+		}
+		blk_put_request(rq);
+		if (delay)
+			ssleep(2);
+	} while (failed && retries >= 0);
+
+	/* return an error if the command failed */
+	return failed ? -EIO : 0;
+}
+
+/*
+ * returns true if rq has been completed
+ */
+static bool ide_cd_error_cmd(ide_drive_t *drive, struct ide_cmd *cmd)
+{
+	unsigned int nr_bytes = cmd->nbytes - cmd->nleft;
+
+	if (cmd->tf_flags & IDE_TFLAG_WRITE)
+		nr_bytes -= cmd->last_xfer_len;
+
+	if (nr_bytes > 0) {
+		ide_complete_rq(drive, BLK_STS_OK, nr_bytes);
+		return true;
+	}
+
+	return false;
+}
+
+static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct ide_cmd *cmd = &hwif->cmd;
+	struct request *rq = hwif->rq;
+	ide_expiry_t *expiry = NULL;
+	int dma_error = 0, dma, thislen, uptodate = 0;
+	int write = (rq_data_dir(rq) == WRITE) ? 1 : 0, rc = 0;
+	int sense = ata_sense_request(rq);
+	unsigned int timeout;
+	u16 len;
+	u8 ireason, stat;
+
+	ide_debug_log(IDE_DBG_PC, "cmd: 0x%x, write: 0x%x", rq->cmd[0], write);
+
+	/* check for errors */
+	dma = drive->dma;
+	if (dma) {
+		drive->dma = 0;
+		drive->waiting_for_dma = 0;
+		dma_error = hwif->dma_ops->dma_end(drive);
+		ide_dma_unmap_sg(drive, cmd);
+		if (dma_error) {
+			printk(KERN_ERR PFX "%s: DMA %s error\n", drive->name,
+					write ? "write" : "read");
+			ide_dma_off(drive);
+		}
+	}
+
+	/* check status */
+	stat = hwif->tp_ops->read_status(hwif);
+
+	if (!OK_STAT(stat, 0, BAD_R_STAT)) {
+		rc = cdrom_decode_status(drive, stat);
+		if (rc) {
+			if (rc == 2)
+				goto out_end;
+			return ide_stopped;
+		}
+	}
+
+	/* using dma, transfer is complete now */
+	if (dma) {
+		if (dma_error)
+			return ide_error(drive, "dma error", stat);
+		uptodate = 1;
+		goto out_end;
+	}
+
+	ide_read_bcount_and_ireason(drive, &len, &ireason);
+
+	thislen = !blk_rq_is_passthrough(rq) ? len : cmd->nleft;
+	if (thislen > len)
+		thislen = len;
+
+	ide_debug_log(IDE_DBG_PC, "DRQ: stat: 0x%x, thislen: %d",
+				  stat, thislen);
+
+	/* If DRQ is clear, the command has completed. */
+	if ((stat & ATA_DRQ) == 0) {
+		switch (req_op(rq)) {
+		default:
+			/*
+			 * If we're not done reading/writing, complain.
+			 * Otherwise, complete the command normally.
+			 */
+			uptodate = 1;
+			if (cmd->nleft > 0) {
+				printk(KERN_ERR PFX "%s: %s: data underrun "
+					"(%u bytes)\n", drive->name, __func__,
+					cmd->nleft);
+				if (!write)
+					rq->rq_flags |= RQF_FAILED;
+				uptodate = 0;
+			}
+			goto out_end;
+		case REQ_OP_DRV_IN:
+		case REQ_OP_DRV_OUT:
+			ide_cd_request_sense_fixup(drive, cmd);
+
+			uptodate = cmd->nleft ? 0 : 1;
+
+			/*
+			 * suck out the remaining bytes from the drive in an
+			 * attempt to complete the data xfer. (see BZ#13399)
+			 */
+			if (!(stat & ATA_ERR) && !uptodate && thislen) {
+				ide_pio_bytes(drive, cmd, write, thislen);
+				uptodate = cmd->nleft ? 0 : 1;
+			}
+
+			if (!uptodate)
+				rq->rq_flags |= RQF_FAILED;
+			goto out_end;
+		case REQ_OP_SCSI_IN:
+		case REQ_OP_SCSI_OUT:
+			goto out_end;
+		}
+	}
+
+	rc = ide_check_ireason(drive, rq, len, ireason, write);
+	if (rc)
+		goto out_end;
+
+	cmd->last_xfer_len = 0;
+
+	ide_debug_log(IDE_DBG_PC, "data transfer, rq->cmd_type: 0x%x, "
+				  "ireason: 0x%x",
+				  rq->cmd_type, ireason);
+
+	/* transfer data */
+	while (thislen > 0) {
+		int blen = min_t(int, thislen, cmd->nleft);
+
+		if (cmd->nleft == 0)
+			break;
+
+		ide_pio_bytes(drive, cmd, write, blen);
+		cmd->last_xfer_len += blen;
+
+		thislen -= blen;
+		len -= blen;
+
+		if (sense && write == 0)
+			scsi_req(rq)->sense_len += blen;
+	}
+
+	/* pad, if necessary */
+	if (len > 0) {
+		if (blk_rq_is_passthrough(rq) || write == 0)
+			ide_pad_transfer(drive, write, len);
+		else {
+			printk(KERN_ERR PFX "%s: confused, missing data\n",
+				drive->name);
+			blk_dump_rq_flags(rq, "cdrom_newpc_intr");
+		}
+	}
+
+	switch (req_op(rq)) {
+	case REQ_OP_SCSI_IN:
+	case REQ_OP_SCSI_OUT:
+		timeout = rq->timeout;
+		break;
+	case REQ_OP_DRV_IN:
+	case REQ_OP_DRV_OUT:
+		expiry = ide_cd_expiry;
+		/*FALLTHRU*/
+	default:
+		timeout = ATAPI_WAIT_PC;
+		break;
+	}
+
+	hwif->expiry = expiry;
+	ide_set_handler(drive, cdrom_newpc_intr, timeout);
+	return ide_started;
+
+out_end:
+	if (blk_rq_is_scsi(rq) && rc == 0) {
+		scsi_req(rq)->resid_len = 0;
+		blk_end_request_all(rq, BLK_STS_OK);
+		hwif->rq = NULL;
+	} else {
+		if (sense && uptodate)
+			ide_cd_complete_failed_rq(drive, rq);
+
+		if (!blk_rq_is_passthrough(rq)) {
+			if (cmd->nleft == 0)
+				uptodate = 1;
+		} else {
+			if (uptodate <= 0 && scsi_req(rq)->result == 0)
+				scsi_req(rq)->result = -EIO;
+		}
+
+		if (uptodate == 0 && rq->bio)
+			if (ide_cd_error_cmd(drive, cmd))
+				return ide_stopped;
+
+		/* make sure it's fully ended */
+		if (blk_rq_is_passthrough(rq)) {
+			scsi_req(rq)->resid_len -= cmd->nbytes - cmd->nleft;
+			if (uptodate == 0 && (cmd->tf_flags & IDE_TFLAG_WRITE))
+				scsi_req(rq)->resid_len += cmd->last_xfer_len;
+		}
+
+		ide_complete_rq(drive, uptodate ? BLK_STS_OK : BLK_STS_IOERR, blk_rq_bytes(rq));
+
+		if (sense && rc == 2)
+			ide_error(drive, "request sense failure", stat);
+	}
+	return ide_stopped;
+}
+
+static ide_startstop_t cdrom_start_rw(ide_drive_t *drive, struct request *rq)
+{
+	struct cdrom_info *cd = drive->driver_data;
+	struct request_queue *q = drive->queue;
+	int write = rq_data_dir(rq) == WRITE;
+	unsigned short sectors_per_frame =
+		queue_logical_block_size(q) >> SECTOR_SHIFT;
+
+	ide_debug_log(IDE_DBG_RQ, "rq->cmd[0]: 0x%x, rq->cmd_flags: 0x%x, "
+				  "secs_per_frame: %u",
+				  rq->cmd[0], rq->cmd_flags, sectors_per_frame);
+
+	if (write) {
+		/* disk has become write protected */
+		if (get_disk_ro(cd->disk))
+			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.
+		 */
+		q->prep_rq_fn(q, rq);
+	}
+
+	/* fs requests *must* be hardware frame aligned */
+	if ((blk_rq_sectors(rq) & (sectors_per_frame - 1)) ||
+	    (blk_rq_pos(rq) & (sectors_per_frame - 1)))
+		return ide_stopped;
+
+	/* use DMA, if possible */
+	drive->dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
+
+	if (write)
+		cd->devinfo.media_written = 1;
+
+	rq->timeout = ATAPI_WAIT_PC;
+
+	return ide_started;
+}
+
+static void cdrom_do_block_pc(ide_drive_t *drive, struct request *rq)
+{
+
+	ide_debug_log(IDE_DBG_PC, "rq->cmd[0]: 0x%x, rq->cmd_type: 0x%x",
+				  rq->cmd[0], rq->cmd_type);
+
+	if (blk_rq_is_scsi(rq))
+		rq->rq_flags |= RQF_QUIET;
+	else
+		rq->rq_flags &= ~RQF_FAILED;
+
+	drive->dma = 0;
+
+	/* sg request */
+	if (rq->bio) {
+		struct request_queue *q = drive->queue;
+		char *buf = bio_data(rq->bio);
+		unsigned int alignment;
+
+		drive->dma = !!(drive->dev_flags & IDE_DFLAG_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
+		    || blk_rq_bytes(rq) & q->dma_pad_mask
+		    || object_is_on_stack(buf))
+			drive->dma = 0;
+	}
+}
+
+static ide_startstop_t ide_cd_do_request(ide_drive_t *drive, struct request *rq,
+					sector_t block)
+{
+	struct ide_cmd cmd;
+	int uptodate = 0;
+	unsigned int nsectors;
+
+	ide_debug_log(IDE_DBG_RQ, "cmd: 0x%x, block: %llu",
+				  rq->cmd[0], (unsigned long long)block);
+
+	if (drive->debug_mask & IDE_DBG_RQ)
+		blk_dump_rq_flags(rq, "ide_cd_do_request");
+
+	switch (req_op(rq)) {
+	default:
+		if (cdrom_start_rw(drive, rq) == ide_stopped)
+			goto out_end;
+		break;
+	case REQ_OP_SCSI_IN:
+	case REQ_OP_SCSI_OUT:
+	handle_pc:
+		if (!rq->timeout)
+			rq->timeout = ATAPI_WAIT_PC;
+		cdrom_do_block_pc(drive, rq);
+		break;
+	case REQ_OP_DRV_IN:
+	case REQ_OP_DRV_OUT:
+		switch (ide_req(rq)->type) {
+		case ATA_PRIV_MISC:
+			/* right now this can only be a reset... */
+			uptodate = 1;
+			goto out_end;
+		case ATA_PRIV_SENSE:
+		case ATA_PRIV_PC:
+			goto handle_pc;
+		default:
+			BUG();
+		}
+	}
+
+	/* prepare sense request for this command */
+	ide_prep_sense(drive, rq);
+
+	memset(&cmd, 0, sizeof(cmd));
+
+	if (rq_data_dir(rq))
+		cmd.tf_flags |= IDE_TFLAG_WRITE;
+
+	cmd.rq = rq;
+
+	if (!blk_rq_is_passthrough(rq) || blk_rq_bytes(rq)) {
+		ide_init_sg_cmd(&cmd, blk_rq_bytes(rq));
+		ide_map_sg(drive, &cmd);
+	}
+
+	return ide_issue_pc(drive, &cmd);
+out_end:
+	nsectors = blk_rq_sectors(rq);
+
+	if (nsectors == 0)
+		nsectors = 1;
+
+	ide_complete_rq(drive, uptodate ? BLK_STS_OK : BLK_STS_IOERR, nsectors << 9);
+
+	return ide_stopped;
+}
+
+/*
+ * 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 scsi_sense_hdr *sshdr)
+{
+	struct cdrom_info *info = drive->driver_data;
+	struct cdrom_device_info *cdi;
+	unsigned char cmd[BLK_MAX_CDB];
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	if (!info)
+		return -EIO;
+
+	cdi = &info->devinfo;
+
+	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, sshdr, 0, RQF_QUIET);
+}
+
+static int cdrom_read_capacity(ide_drive_t *drive, unsigned long *capacity,
+			       unsigned long *sectors_per_frame)
+{
+	struct {
+		__be32 lba;
+		__be32 blocklen;
+	} capbuf;
+
+	int stat;
+	unsigned char cmd[BLK_MAX_CDB];
+	unsigned len = sizeof(capbuf);
+	u32 blocklen;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	memset(cmd, 0, BLK_MAX_CDB);
+	cmd[0] = GPCMD_READ_CDVD_CAPACITY;
+
+	stat = ide_cd_queue_pc(drive, cmd, 0, &capbuf, &len, NULL, 0,
+			       RQF_QUIET);
+	if (stat)
+		return stat;
+
+	/*
+	 * Sanity check the given block size, in so far as making
+	 * sure the sectors_per_frame we give to the caller won't
+	 * end up being bogus.
+	 */
+	blocklen = be32_to_cpu(capbuf.blocklen);
+	blocklen = (blocklen >> SECTOR_SHIFT) << SECTOR_SHIFT;
+	switch (blocklen) {
+	case 512:
+	case 1024:
+	case 2048:
+	case 4096:
+		break;
+	default:
+		printk_once(KERN_ERR PFX "%s: weird block size %u; "
+				"setting default block size to 2048\n",
+				drive->name, blocklen);
+		blocklen = 2048;
+		break;
+	}
+
+	*capacity = 1 + be32_to_cpu(capbuf.lba);
+	*sectors_per_frame = blocklen >> SECTOR_SHIFT;
+
+	ide_debug_log(IDE_DBG_PROBE, "cap: %lu, sectors_per_frame: %lu",
+				     *capacity, *sectors_per_frame);
+
+	return 0;
+}
+
+static int cdrom_read_tocentry(ide_drive_t *drive, int trackno, int msf_flag,
+				int format, char *buf, int buflen)
+{
+	unsigned char cmd[BLK_MAX_CDB];
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	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, NULL, 0, RQF_QUIET);
+}
+
+/* Try to read the entire TOC for the disk into our internal buffer. */
+int ide_cd_read_toc(ide_drive_t *drive)
+{
+	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;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	if (toc == NULL) {
+		/* try to allocate space */
+		toc = kmalloc(sizeof(struct atapi_toc), GFP_KERNEL);
+		if (toc == NULL) {
+			printk(KERN_ERR PFX "%s: No cdrom TOC buffer!\n",
+					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, NULL);
+
+	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);
+	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_logical_block_size(drive->queue,
+				     sectors_per_frame << SECTOR_SHIFT);
+
+	/* 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));
+	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));
+
+	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));
+		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));
+		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));
+		if (stat)
+			return stat;
+
+		msf_from_bcd(&ms_tmp.ent.addr.msf);
+		toc->last_session_lba = msf_to_lba(ms_tmp.ent.addr.msf.minute,
+						   ms_tmp.ent.addr.msf.second,
+						   ms_tmp.ent.addr.msf.frame);
+	}
+
+	toc->xa_flag = (ms_tmp.hdr.first_track != ms_tmp.hdr.last_track);
+
+	/* now try to get the total cdrom capacity */
+	stat = cdrom_get_last_written(cdi, &last_written);
+	if (!stat && (last_written > toc->capacity)) {
+		toc->capacity = last_written;
+		set_capacity(info->disk, toc->capacity * sectors_per_frame);
+		drive->probed_capacity = toc->capacity * sectors_per_frame;
+	}
+
+	/* Remember that we've read this stuff. */
+	drive->atapi_flags |= IDE_AFLAG_TOC_VALID;
+
+	return 0;
+}
+
+int ide_cdrom_get_capabilities(ide_drive_t *drive, u8 *buf)
+{
+	struct cdrom_info *info = drive->driver_data;
+	struct cdrom_device_info *cdi = &info->devinfo;
+	struct packet_command cgc;
+	int stat, attempts = 3, size = ATAPI_CAPABILITIES_PAGE_SIZE;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	if ((drive->atapi_flags & IDE_AFLAG_FULL_CAPS_PAGE) == 0)
+		size -= ATAPI_CAPABILITIES_PAGE_PAD_SIZE;
+
+	init_cdrom_command(&cgc, buf, size, CGC_DATA_UNKNOWN);
+	do {
+		/* we seem to get stat=0x01,err=0x00 the first time (??) */
+		stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CAPABILITIES_PAGE, 0);
+		if (!stat)
+			break;
+	} while (--attempts);
+	return stat;
+}
+
+void ide_cdrom_update_speed(ide_drive_t *drive, u8 *buf)
+{
+	struct cdrom_info *cd = drive->driver_data;
+	u16 curspeed, maxspeed;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	if (drive->atapi_flags & IDE_AFLAG_LE_SPEED_FIELDS) {
+		curspeed = le16_to_cpup((__le16 *)&buf[8 + 14]);
+		maxspeed = le16_to_cpup((__le16 *)&buf[8 + 8]);
+	} else {
+		curspeed = be16_to_cpup((__be16 *)&buf[8 + 14]);
+		maxspeed = be16_to_cpup((__be16 *)&buf[8 + 8]);
+	}
+
+	ide_debug_log(IDE_DBG_PROBE, "curspeed: %u, maxspeed: %u",
+				     curspeed, maxspeed);
+
+	cd->current_speed = DIV_ROUND_CLOSEST(curspeed, 176);
+	cd->max_speed = DIV_ROUND_CLOSEST(maxspeed, 176);
+}
+
+#define IDE_CD_CAPABILITIES \
+	(CDC_CLOSE_TRAY | CDC_OPEN_TRAY | CDC_LOCK | CDC_SELECT_SPEED | \
+	 CDC_SELECT_DISC | CDC_MULTI_SESSION | CDC_MCN | CDC_MEDIA_CHANGED | \
+	 CDC_PLAY_AUDIO | CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R | \
+	 CDC_CD_RW | CDC_DVD | CDC_DVD_R | CDC_DVD_RAM | CDC_GENERIC_PACKET | \
+	 CDC_MO_DRIVE | CDC_MRW | CDC_MRW_W | CDC_RAM)
+
+static const struct cdrom_device_ops ide_cdrom_dops = {
+	.open			= ide_cdrom_open_real,
+	.release		= ide_cdrom_release_real,
+	.drive_status		= ide_cdrom_drive_status,
+	.check_events		= ide_cdrom_check_events_real,
+	.tray_move		= ide_cdrom_tray_move,
+	.lock_door		= ide_cdrom_lock_door,
+	.select_speed		= ide_cdrom_select_speed,
+	.get_last_session	= ide_cdrom_get_last_session,
+	.get_mcn		= ide_cdrom_get_mcn,
+	.reset			= ide_cdrom_reset,
+	.audio_ioctl		= ide_cdrom_audio_ioctl,
+	.capability		= IDE_CD_CAPABILITIES,
+	.generic_packet		= ide_cdrom_packet,
+};
+
+static int ide_cdrom_register(ide_drive_t *drive, int nslots)
+{
+	struct cdrom_info *info = drive->driver_data;
+	struct cdrom_device_info *devinfo = &info->devinfo;
+
+	ide_debug_log(IDE_DBG_PROBE, "nslots: %d", nslots);
+
+	devinfo->ops = &ide_cdrom_dops;
+	devinfo->speed = info->current_speed;
+	devinfo->capacity = nslots;
+	devinfo->handle = drive;
+	strcpy(devinfo->name, drive->name);
+
+	if (drive->atapi_flags & IDE_AFLAG_NO_SPEED_SELECT)
+		devinfo->mask |= CDC_SELECT_SPEED;
+
+	devinfo->disk = info->disk;
+	return register_cdrom(devinfo);
+}
+
+static int ide_cdrom_probe_capabilities(ide_drive_t *drive)
+{
+	struct cdrom_info *cd = drive->driver_data;
+	struct cdrom_device_info *cdi = &cd->devinfo;
+	u8 buf[ATAPI_CAPABILITIES_PAGE_SIZE];
+	mechtype_t mechtype;
+	int nslots = 1;
+
+	ide_debug_log(IDE_DBG_PROBE, "media: 0x%x, atapi_flags: 0x%lx",
+				     drive->media, drive->atapi_flags);
+
+	cdi->mask = (CDC_CD_R | CDC_CD_RW | CDC_DVD | CDC_DVD_R |
+		     CDC_DVD_RAM | CDC_SELECT_DISC | CDC_PLAY_AUDIO |
+		     CDC_MO_DRIVE | CDC_RAM);
+
+	if (drive->media == ide_optical) {
+		cdi->mask &= ~(CDC_MO_DRIVE | CDC_RAM);
+		printk(KERN_ERR PFX "%s: ATAPI magneto-optical drive\n",
+				drive->name);
+		return nslots;
+	}
+
+	if (drive->atapi_flags & IDE_AFLAG_PRE_ATAPI12) {
+		drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
+		cdi->mask &= ~CDC_PLAY_AUDIO;
+		return nslots;
+	}
+
+	/*
+	 * We have to cheat a little here. the packet will eventually be queued
+	 * with ide_cdrom_packet(), which extracts the drive from cdi->handle.
+	 * Since this device hasn't been registered with the Uniform layer yet,
+	 * it can't do this. Same goes for cdi->ops.
+	 */
+	cdi->handle = drive;
+	cdi->ops = &ide_cdrom_dops;
+
+	if (ide_cdrom_get_capabilities(drive, buf))
+		return 0;
+
+	if ((buf[8 + 6] & 0x01) == 0)
+		drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;
+	if (buf[8 + 6] & 0x08)
+		drive->atapi_flags &= ~IDE_AFLAG_NO_EJECT;
+	if (buf[8 + 3] & 0x01)
+		cdi->mask &= ~CDC_CD_R;
+	if (buf[8 + 3] & 0x02)
+		cdi->mask &= ~(CDC_CD_RW | CDC_RAM);
+	if (buf[8 + 2] & 0x38)
+		cdi->mask &= ~CDC_DVD;
+	if (buf[8 + 3] & 0x20)
+		cdi->mask &= ~(CDC_DVD_RAM | CDC_RAM);
+	if (buf[8 + 3] & 0x10)
+		cdi->mask &= ~CDC_DVD_R;
+	if ((buf[8 + 4] & 0x01) || (drive->atapi_flags & IDE_AFLAG_PLAY_AUDIO_OK))
+		cdi->mask &= ~CDC_PLAY_AUDIO;
+
+	mechtype = buf[8 + 6] >> 5;
+	if (mechtype == mechtype_caddy ||
+	    mechtype == mechtype_popup ||
+	    (drive->atapi_flags & IDE_AFLAG_NO_AUTOCLOSE))
+		cdi->mask |= CDC_CLOSE_TRAY;
+
+	if (cdi->sanyo_slot > 0) {
+		cdi->mask &= ~CDC_SELECT_DISC;
+		nslots = 3;
+	} else if (mechtype == mechtype_individual_changer ||
+		   mechtype == mechtype_cartridge_changer) {
+		nslots = cdrom_number_of_slots(cdi);
+		if (nslots > 1)
+			cdi->mask &= ~CDC_SELECT_DISC;
+	}
+
+	ide_cdrom_update_speed(drive, buf);
+
+	printk(KERN_INFO PFX "%s: ATAPI", drive->name);
+
+	/* don't print speed if the drive reported 0 */
+	if (cd->max_speed)
+		printk(KERN_CONT " %dX", cd->max_speed);
+
+	printk(KERN_CONT " %s", (cdi->mask & CDC_DVD) ? "CD-ROM" : "DVD-ROM");
+
+	if ((cdi->mask & CDC_DVD_R) == 0 || (cdi->mask & CDC_DVD_RAM) == 0)
+		printk(KERN_CONT " DVD%s%s",
+				 (cdi->mask & CDC_DVD_R) ? "" : "-R",
+				 (cdi->mask & CDC_DVD_RAM) ? "" : "/RAM");
+
+	if ((cdi->mask & CDC_CD_R) == 0 || (cdi->mask & CDC_CD_RW) == 0)
+		printk(KERN_CONT " CD%s%s",
+				 (cdi->mask & CDC_CD_R) ? "" : "-R",
+				 (cdi->mask & CDC_CD_RW) ? "" : "/RW");
+
+	if ((cdi->mask & CDC_SELECT_DISC) == 0)
+		printk(KERN_CONT " changer w/%d slots", nslots);
+	else
+		printk(KERN_CONT " drive");
+
+	printk(KERN_CONT ", %dkB Cache\n",
+			 be16_to_cpup((__be16 *)&buf[8 + 12]));
+
+	return nslots;
+}
+
+/* standard prep_rq_fn that builds 10 byte cmds */
+static int ide_cdrom_prep_fs(struct request_queue *q, struct request *rq)
+{
+	int hard_sect = queue_logical_block_size(q);
+	long block = (long)blk_rq_pos(rq) / (hard_sect >> 9);
+	unsigned long blocks = blk_rq_sectors(rq) / (hard_sect >> 9);
+	struct scsi_request *req = scsi_req(rq);
+
+	q->initialize_rq_fn(rq);
+
+	if (rq_data_dir(rq) == READ)
+		req->cmd[0] = GPCMD_READ_10;
+	else
+		req->cmd[0] = GPCMD_WRITE_10;
+
+	/*
+	 * fill in lba
+	 */
+	req->cmd[2] = (block >> 24) & 0xff;
+	req->cmd[3] = (block >> 16) & 0xff;
+	req->cmd[4] = (block >>  8) & 0xff;
+	req->cmd[5] = block & 0xff;
+
+	/*
+	 * and transfer length
+	 */
+	req->cmd[7] = (blocks >> 8) & 0xff;
+	req->cmd[8] = blocks & 0xff;
+	req->cmd_len = 10;
+	return BLKPREP_OK;
+}
+
+/*
+ * Most of the SCSI commands are supported directly by ATAPI devices.
+ * This transform handles the few exceptions.
+ */
+static int ide_cdrom_prep_pc(struct request *rq)
+{
+	u8 *c = scsi_req(rq)->cmd;
+
+	/* transform 6-byte read/write commands to the 10-byte version */
+	if (c[0] == READ_6 || c[0] == WRITE_6) {
+		c[8] = c[4];
+		c[5] = c[3];
+		c[4] = c[2];
+		c[3] = c[1] & 0x1f;
+		c[2] = 0;
+		c[1] &= 0xe0;
+		c[0] += (READ_10 - READ_6);
+		scsi_req(rq)->cmd_len = 10;
+		return BLKPREP_OK;
+	}
+
+	/*
+	 * it's silly to pretend we understand 6-byte sense commands, just
+	 * reject with ILLEGAL_REQUEST and the caller should take the
+	 * appropriate action
+	 */
+	if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
+		scsi_req(rq)->result = ILLEGAL_REQUEST;
+		return BLKPREP_KILL;
+	}
+
+	return BLKPREP_OK;
+}
+
+static int ide_cdrom_prep_fn(struct request_queue *q, struct request *rq)
+{
+	if (!blk_rq_is_passthrough(rq))
+		return ide_cdrom_prep_fs(q, rq);
+	else if (blk_rq_is_scsi(rq))
+		return ide_cdrom_prep_pc(rq);
+
+	return 0;
+}
+
+struct cd_list_entry {
+	const char	*id_model;
+	const char	*id_firmware;
+	unsigned int	cd_flags;
+};
+
+#ifdef CONFIG_IDE_PROC_FS
+static sector_t ide_cdrom_capacity(ide_drive_t *drive)
+{
+	unsigned long capacity, sectors_per_frame;
+
+	if (cdrom_read_capacity(drive, &capacity, &sectors_per_frame))
+		return 0;
+
+	return capacity * sectors_per_frame;
+}
+
+static int idecd_capacity_proc_show(struct seq_file *m, void *v)
+{
+	ide_drive_t *drive = m->private;
+
+	seq_printf(m, "%llu\n", (long long)ide_cdrom_capacity(drive));
+	return 0;
+}
+
+static ide_proc_entry_t idecd_proc[] = {
+	{ "capacity", S_IFREG|S_IRUGO, idecd_capacity_proc_show },
+	{}
+};
+
+static ide_proc_entry_t *ide_cd_proc_entries(ide_drive_t *drive)
+{
+	return idecd_proc;
+}
+
+static const struct ide_proc_devset *ide_cd_proc_devsets(ide_drive_t *drive)
+{
+	return NULL;
+}
+#endif
+
+static const struct cd_list_entry ide_cd_quirks_list[] = {
+	/* SCR-3231 doesn't support the SET_CD_SPEED command. */
+	{ "SAMSUNG CD-ROM SCR-3231", NULL,   IDE_AFLAG_NO_SPEED_SELECT	     },
+	/* Old NEC260 (not R) was released before ATAPI 1.2 spec. */
+	{ "NEC CD-ROM DRIVE:260",    "1.01", IDE_AFLAG_TOCADDR_AS_BCD |
+					     IDE_AFLAG_PRE_ATAPI12,	     },
+	/* Vertos 300, some versions of this drive like to talk BCD. */
+	{ "V003S0DS",		     NULL,   IDE_AFLAG_VERTOS_300_SSD,	     },
+	/* Vertos 600 ESD. */
+	{ "V006E0DS",		     NULL,   IDE_AFLAG_VERTOS_600_ESD,	     },
+	/*
+	 * Sanyo 3 CD changer uses a non-standard command for CD changing
+	 * (by default standard ATAPI support for CD changers is used).
+	 */
+	{ "CD-ROM CDR-C3 G",	     NULL,   IDE_AFLAG_SANYO_3CD	     },
+	{ "CD-ROM CDR-C3G",	     NULL,   IDE_AFLAG_SANYO_3CD	     },
+	{ "CD-ROM CDR_C36",	     NULL,   IDE_AFLAG_SANYO_3CD	     },
+	/* Stingray 8X CD-ROM. */
+	{ "STINGRAY 8422 IDE 8X CD-ROM 7-27-95", NULL, IDE_AFLAG_PRE_ATAPI12 },
+	/*
+	 * ACER 50X CD-ROM and WPI 32X CD-ROM require the full spec length
+	 * mode sense page capabilities size, but older drives break.
+	 */
+	{ "ATAPI CD ROM DRIVE 50X MAX",	NULL,	IDE_AFLAG_FULL_CAPS_PAGE     },
+	{ "WPI CDS-32X",		NULL,	IDE_AFLAG_FULL_CAPS_PAGE     },
+	/* ACER/AOpen 24X CD-ROM has the speed fields byte-swapped. */
+	{ "",			     "241N", IDE_AFLAG_LE_SPEED_FIELDS       },
+	/*
+	 * Some drives used by Apple don't advertise audio play
+	 * but they do support reading TOC & audio datas.
+	 */
+	{ "MATSHITADVD-ROM SR-8187", NULL,   IDE_AFLAG_PLAY_AUDIO_OK	     },
+	{ "MATSHITADVD-ROM SR-8186", NULL,   IDE_AFLAG_PLAY_AUDIO_OK	     },
+	{ "MATSHITADVD-ROM SR-8176", NULL,   IDE_AFLAG_PLAY_AUDIO_OK	     },
+	{ "MATSHITADVD-ROM SR-8174", NULL,   IDE_AFLAG_PLAY_AUDIO_OK	     },
+	{ "Optiarc DVD RW AD-5200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK	     },
+	{ "Optiarc DVD RW AD-7200A", NULL,   IDE_AFLAG_PLAY_AUDIO_OK	     },
+	{ "Optiarc DVD RW AD-7543A", NULL,   IDE_AFLAG_NO_AUTOCLOSE	     },
+	{ "TEAC CD-ROM CD-224E",     NULL,   IDE_AFLAG_NO_AUTOCLOSE	     },
+	{ NULL, NULL, 0 }
+};
+
+static unsigned int ide_cd_flags(u16 *id)
+{
+	const struct cd_list_entry *cle = ide_cd_quirks_list;
+
+	while (cle->id_model) {
+		if (strcmp(cle->id_model, (char *)&id[ATA_ID_PROD]) == 0 &&
+		    (cle->id_firmware == NULL ||
+		     strstr((char *)&id[ATA_ID_FW_REV], cle->id_firmware)))
+			return cle->cd_flags;
+		cle++;
+	}
+
+	return 0;
+}
+
+static int ide_cdrom_setup(ide_drive_t *drive)
+{
+	struct cdrom_info *cd = drive->driver_data;
+	struct cdrom_device_info *cdi = &cd->devinfo;
+	struct request_queue *q = drive->queue;
+	u16 *id = drive->id;
+	char *fw_rev = (char *)&id[ATA_ID_FW_REV];
+	int nslots;
+
+	ide_debug_log(IDE_DBG_PROBE, "enter");
+
+	blk_queue_prep_rq(q, ide_cdrom_prep_fn);
+	blk_queue_dma_alignment(q, 31);
+	blk_queue_update_dma_pad(q, 15);
+
+	drive->dev_flags |= IDE_DFLAG_MEDIA_CHANGED;
+	drive->atapi_flags = IDE_AFLAG_NO_EJECT | ide_cd_flags(id);
+
+	if ((drive->atapi_flags & IDE_AFLAG_VERTOS_300_SSD) &&
+	    fw_rev[4] == '1' && fw_rev[6] <= '2')
+		drive->atapi_flags |= (IDE_AFLAG_TOCTRACKS_AS_BCD |
+				     IDE_AFLAG_TOCADDR_AS_BCD);
+	else if ((drive->atapi_flags & IDE_AFLAG_VERTOS_600_ESD) &&
+		 fw_rev[4] == '1' && fw_rev[6] <= '2')
+		drive->atapi_flags |= IDE_AFLAG_TOCTRACKS_AS_BCD;
+	else if (drive->atapi_flags & IDE_AFLAG_SANYO_3CD)
+		/* 3 => use CD in slot 0 */
+		cdi->sanyo_slot = 3;
+
+	nslots = ide_cdrom_probe_capabilities(drive);
+
+	blk_queue_logical_block_size(q, CD_FRAMESIZE);
+
+	if (ide_cdrom_register(drive, nslots)) {
+		printk(KERN_ERR PFX "%s: %s failed to register device with the"
+				" cdrom driver.\n", drive->name, __func__);
+		cd->devinfo.handle = NULL;
+		return 1;
+	}
+
+	ide_proc_register_driver(drive, cd->driver);
+	return 0;
+}
+
+static void ide_cd_remove(ide_drive_t *drive)
+{
+	struct cdrom_info *info = drive->driver_data;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	ide_proc_unregister_driver(drive, info->driver);
+	device_del(&info->dev);
+	del_gendisk(info->disk);
+
+	mutex_lock(&idecd_ref_mutex);
+	put_device(&info->dev);
+	mutex_unlock(&idecd_ref_mutex);
+}
+
+static void ide_cd_release(struct device *dev)
+{
+	struct cdrom_info *info = to_ide_drv(dev, cdrom_info);
+	struct cdrom_device_info *devinfo = &info->devinfo;
+	ide_drive_t *drive = info->drive;
+	struct gendisk *g = info->disk;
+
+	ide_debug_log(IDE_DBG_FUNC, "enter");
+
+	kfree(info->toc);
+	if (devinfo->handle == drive)
+		unregister_cdrom(devinfo);
+	drive->driver_data = NULL;
+	blk_queue_prep_rq(drive->queue, NULL);
+	g->private_data = NULL;
+	put_disk(g);
+	kfree(info);
+}
+
+static int ide_cd_probe(ide_drive_t *);
+
+static struct ide_driver ide_cdrom_driver = {
+	.gen_driver = {
+		.owner		= THIS_MODULE,
+		.name		= "ide-cdrom",
+		.bus		= &ide_bus_type,
+	},
+	.probe			= ide_cd_probe,
+	.remove			= ide_cd_remove,
+	.version		= IDECD_VERSION,
+	.do_request		= ide_cd_do_request,
+#ifdef CONFIG_IDE_PROC_FS
+	.proc_entries		= ide_cd_proc_entries,
+	.proc_devsets		= ide_cd_proc_devsets,
+#endif
+};
+
+static int idecd_open(struct block_device *bdev, fmode_t mode)
+{
+	struct cdrom_info *info;
+	int rc = -ENXIO;
+
+	check_disk_change(bdev);
+
+	mutex_lock(&ide_cd_mutex);
+	info = ide_cd_get(bdev->bd_disk);
+	if (!info)
+		goto out;
+
+	rc = cdrom_open(&info->devinfo, bdev, mode);
+	if (rc < 0)
+		ide_cd_put(info);
+out:
+	mutex_unlock(&ide_cd_mutex);
+	return rc;
+}
+
+static void idecd_release(struct gendisk *disk, fmode_t mode)
+{
+	struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
+
+	mutex_lock(&ide_cd_mutex);
+	cdrom_release(&info->devinfo, mode);
+
+	ide_cd_put(info);
+	mutex_unlock(&ide_cd_mutex);
+}
+
+static int idecd_set_spindown(struct cdrom_device_info *cdi, unsigned long arg)
+{
+	struct packet_command cgc;
+	char buffer[16];
+	int stat;
+	char spindown;
+
+	if (copy_from_user(&spindown, (void __user *)arg, sizeof(char)))
+		return -EFAULT;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
+
+	stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
+	if (stat)
+		return stat;
+
+	buffer[11] = (buffer[11] & 0xf0) | (spindown & 0x0f);
+	return cdrom_mode_select(cdi, &cgc);
+}
+
+static int idecd_get_spindown(struct cdrom_device_info *cdi, unsigned long arg)
+{
+	struct packet_command cgc;
+	char buffer[16];
+	int stat;
+	char spindown;
+
+	init_cdrom_command(&cgc, buffer, sizeof(buffer), CGC_DATA_UNKNOWN);
+
+	stat = cdrom_mode_sense(cdi, &cgc, GPMODE_CDROM_PAGE, 0);
+	if (stat)
+		return stat;
+
+	spindown = buffer[11] & 0x0f;
+	if (copy_to_user((void __user *)arg, &spindown, sizeof(char)))
+		return -EFAULT;
+	return 0;
+}
+
+static int idecd_locked_ioctl(struct block_device *bdev, fmode_t mode,
+			unsigned int cmd, unsigned long arg)
+{
+	struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
+	int err;
+
+	switch (cmd) {
+	case CDROMSETSPINDOWN:
+		return idecd_set_spindown(&info->devinfo, arg);
+	case CDROMGETSPINDOWN:
+		return idecd_get_spindown(&info->devinfo, arg);
+	default:
+		break;
+	}
+
+	err = generic_ide_ioctl(info->drive, bdev, cmd, arg);
+	if (err == -EINVAL)
+		err = cdrom_ioctl(&info->devinfo, bdev, mode, cmd, arg);
+
+	return err;
+}
+
+static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
+			     unsigned int cmd, unsigned long arg)
+{
+	int ret;
+
+	mutex_lock(&ide_cd_mutex);
+	ret = idecd_locked_ioctl(bdev, mode, cmd, arg);
+	mutex_unlock(&ide_cd_mutex);
+
+	return ret;
+}
+
+
+static unsigned int idecd_check_events(struct gendisk *disk,
+				       unsigned int clearing)
+{
+	struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
+	return cdrom_check_events(&info->devinfo, clearing);
+}
+
+static int idecd_revalidate_disk(struct gendisk *disk)
+{
+	struct cdrom_info *info = ide_drv_g(disk, cdrom_info);
+
+	ide_cd_read_toc(info->drive);
+
+	return  0;
+}
+
+static const struct block_device_operations idecd_ops = {
+	.owner			= THIS_MODULE,
+	.open			= idecd_open,
+	.release		= idecd_release,
+	.ioctl			= idecd_ioctl,
+	.check_events		= idecd_check_events,
+	.revalidate_disk	= idecd_revalidate_disk
+};
+
+/* module options */
+static unsigned long debug_mask;
+module_param(debug_mask, ulong, 0644);
+
+MODULE_DESCRIPTION("ATAPI CD-ROM Driver");
+
+static int ide_cd_probe(ide_drive_t *drive)
+{
+	struct cdrom_info *info;
+	struct gendisk *g;
+
+	ide_debug_log(IDE_DBG_PROBE, "driver_req: %s, media: 0x%x",
+				     drive->driver_req, drive->media);
+
+	if (!strstr("ide-cdrom", drive->driver_req))
+		goto failed;
+
+	if (drive->media != ide_cdrom && drive->media != ide_optical)
+		goto failed;
+
+	drive->debug_mask = debug_mask;
+	drive->irq_handler = cdrom_newpc_intr;
+
+	info = kzalloc(sizeof(struct cdrom_info), GFP_KERNEL);
+	if (info == NULL) {
+		printk(KERN_ERR PFX "%s: Can't allocate a cdrom structure\n",
+				drive->name);
+		goto failed;
+	}
+
+	g = alloc_disk(1 << PARTN_BITS);
+	if (!g)
+		goto out_free_cd;
+
+	ide_init_disk(g, drive);
+
+	info->dev.parent = &drive->gendev;
+	info->dev.release = ide_cd_release;
+	dev_set_name(&info->dev, "%s", dev_name(&drive->gendev));
+
+	if (device_register(&info->dev))
+		goto out_free_disk;
+
+	info->drive = drive;
+	info->driver = &ide_cdrom_driver;
+	info->disk = g;
+
+	g->private_data = &info->driver;
+
+	drive->driver_data = info;
+
+	g->minors = 1;
+	g->flags = GENHD_FL_CD | GENHD_FL_REMOVABLE;
+	if (ide_cdrom_setup(drive)) {
+		put_device(&info->dev);
+		goto failed;
+	}
+
+	ide_cd_read_toc(drive);
+	g->fops = &idecd_ops;
+	g->flags |= GENHD_FL_REMOVABLE | GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE;
+	device_add_disk(&drive->gendev, g, NULL);
+	return 0;
+
+out_free_disk:
+	put_disk(g);
+out_free_cd:
+	kfree(info);
+failed:
+	return -ENODEV;
+}
+
+static void __exit ide_cdrom_exit(void)
+{
+	driver_unregister(&ide_cdrom_driver.gen_driver);
+}
+
+static int __init ide_cdrom_init(void)
+{
+	printk(KERN_INFO DRV_NAME " driver " IDECD_VERSION "\n");
+	return driver_register(&ide_cdrom_driver.gen_driver);
+}
+
+MODULE_ALIAS("ide:*m-cdrom*");
+MODULE_ALIAS("ide-cd");
+module_init(ide_cdrom_init);
+module_exit(ide_cdrom_exit);
+MODULE_LICENSE("GPL");