Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 1634 insertions, 0 deletions

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
new file mode 100644
index 000000000..3b75a7b7a
--- /dev/null
+++ b/drivers/ide/ide-probe.c
@@ -0,0 +1,1634 @@
+/*
+ *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
+ *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
+ */
+
+/*
+ *  Mostly written by Mark Lord <mlord@pobox.com>
+ *                and Gadi Oxman <gadio@netvision.net.il>
+ *                and Andre Hedrick <andre@linux-ide.org>
+ *
+ *  See linux/MAINTAINERS for address of current maintainer.
+ *
+ * This is the IDE probe module, as evolved from hd.c and ide.c.
+ *
+ * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
+ *	 by Andrea Arcangeli
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/genhd.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+#include <linux/spinlock.h>
+#include <linux/kmod.h>
+#include <linux/pci.h>
+#include <linux/scatterlist.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <linux/uaccess.h>
+#include <asm/io.h>
+
+/**
+ *	generic_id		-	add a generic drive id
+ *	@drive:	drive to make an ID block for
+ *	
+ *	Add a fake id field to the drive we are passed. This allows
+ *	use to skip a ton of NULL checks (which people always miss) 
+ *	and make drive properties unconditional outside of this file
+ */
+ 
+static void generic_id(ide_drive_t *drive)
+{
+	u16 *id = drive->id;
+
+	id[ATA_ID_CUR_CYLS]	= id[ATA_ID_CYLS]	= drive->cyl;
+	id[ATA_ID_CUR_HEADS]	= id[ATA_ID_HEADS]	= drive->head;
+	id[ATA_ID_CUR_SECTORS]	= id[ATA_ID_SECTORS]	= drive->sect;
+}
+
+static void ide_disk_init_chs(ide_drive_t *drive)
+{
+	u16 *id = drive->id;
+
+	/* Extract geometry if we did not already have one for the drive */
+	if (!drive->cyl || !drive->head || !drive->sect) {
+		drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
+		drive->head = drive->bios_head = id[ATA_ID_HEADS];
+		drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
+	}
+
+	/* Handle logical geometry translation by the drive */
+	if (ata_id_current_chs_valid(id)) {
+		drive->cyl  = id[ATA_ID_CUR_CYLS];
+		drive->head = id[ATA_ID_CUR_HEADS];
+		drive->sect = id[ATA_ID_CUR_SECTORS];
+	}
+
+	/* Use physical geometry if what we have still makes no sense */
+	if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
+		drive->cyl  = id[ATA_ID_CYLS];
+		drive->head = id[ATA_ID_HEADS];
+		drive->sect = id[ATA_ID_SECTORS];
+	}
+}
+
+static void ide_disk_init_mult_count(ide_drive_t *drive)
+{
+	u16 *id = drive->id;
+	u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
+
+	if (max_multsect) {
+		if ((max_multsect / 2) > 1)
+			id[ATA_ID_MULTSECT] = max_multsect | 0x100;
+		else
+			id[ATA_ID_MULTSECT] &= ~0x1ff;
+
+		drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
+
+		if (drive->mult_req)
+			drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
+	}
+}
+
+static void ide_classify_ata_dev(ide_drive_t *drive)
+{
+	u16 *id = drive->id;
+	char *m = (char *)&id[ATA_ID_PROD];
+	int is_cfa = ata_id_is_cfa(id);
+
+	/* CF devices are *not* removable in Linux definition of the term */
+	if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
+		drive->dev_flags |= IDE_DFLAG_REMOVABLE;
+
+	drive->media = ide_disk;
+
+	if (!ata_id_has_unload(drive->id))
+		drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
+
+	printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
+		is_cfa ? "CFA" : "ATA");
+}
+
+static void ide_classify_atapi_dev(ide_drive_t *drive)
+{
+	u16 *id = drive->id;
+	char *m = (char *)&id[ATA_ID_PROD];
+	u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
+
+	printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
+	switch (type) {
+	case ide_floppy:
+		if (!strstr(m, "CD-ROM")) {
+			if (!strstr(m, "oppy") &&
+			    !strstr(m, "poyp") &&
+			    !strstr(m, "ZIP"))
+				printk(KERN_CONT "cdrom or floppy?, assuming ");
+			if (drive->media != ide_cdrom) {
+				printk(KERN_CONT "FLOPPY");
+				drive->dev_flags |= IDE_DFLAG_REMOVABLE;
+				break;
+			}
+		}
+		/* Early cdrom models used zero */
+		type = ide_cdrom;
+		/* fall through */
+	case ide_cdrom:
+		drive->dev_flags |= IDE_DFLAG_REMOVABLE;
+#ifdef CONFIG_PPC
+		/* kludge for Apple PowerBook internal zip */
+		if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
+			printk(KERN_CONT "FLOPPY");
+			type = ide_floppy;
+			break;
+		}
+#endif
+		printk(KERN_CONT "CD/DVD-ROM");
+		break;
+	case ide_tape:
+		printk(KERN_CONT "TAPE");
+		break;
+	case ide_optical:
+		printk(KERN_CONT "OPTICAL");
+		drive->dev_flags |= IDE_DFLAG_REMOVABLE;
+		break;
+	default:
+		printk(KERN_CONT "UNKNOWN (type %d)", type);
+		break;
+	}
+
+	printk(KERN_CONT " drive\n");
+	drive->media = type;
+	/* an ATAPI device ignores DRDY */
+	drive->ready_stat = 0;
+	if (ata_id_cdb_intr(id))
+		drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
+	drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
+	/* we don't do head unloading on ATAPI devices */
+	drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
+}
+
+/**
+ *	do_identify	-	identify a drive
+ *	@drive: drive to identify 
+ *	@cmd: command used
+ *	@id: buffer for IDENTIFY data
+ *
+ *	Called when we have issued a drive identify command to
+ *	read and parse the results. This function is run with
+ *	interrupts disabled. 
+ */
+
+static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	char *m = (char *)&id[ATA_ID_PROD];
+	unsigned long flags;
+	int bswap = 1;
+
+	/* local CPU only; some systems need this */
+	local_irq_save(flags);
+	/* read 512 bytes of id info */
+	hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
+	local_irq_restore(flags);
+
+	drive->dev_flags |= IDE_DFLAG_ID_READ;
+#ifdef DEBUG
+	printk(KERN_INFO "%s: dumping identify data\n", drive->name);
+	ide_dump_identify((u8 *)id);
+#endif
+	ide_fix_driveid(id);
+
+	/*
+	 *  ATA_CMD_ID_ATA returns little-endian info,
+	 *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
+	 */
+	if (cmd == ATA_CMD_ID_ATAPI) {
+		if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
+		    (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
+		    (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
+			/* Vertos drives may still be weird */
+			bswap ^= 1;
+	}
+
+	ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
+	ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
+	ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
+
+	/* we depend on this a lot! */
+	m[ATA_ID_PROD_LEN - 1] = '\0';
+
+	if (strstr(m, "E X A B Y T E N E S T"))
+		drive->dev_flags &= ~IDE_DFLAG_PRESENT;
+	else
+		drive->dev_flags |= IDE_DFLAG_PRESENT;
+}
+
+/**
+ *	ide_dev_read_id	-	send ATA/ATAPI IDENTIFY command
+ *	@drive: drive to identify
+ *	@cmd: command to use
+ *	@id: buffer for IDENTIFY data
+ *	@irq_ctx: flag set when called from the IRQ context
+ *
+ *	Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
+ *
+ *	Returns:	0  device was identified
+ *			1  device timed-out (no response to identify request)
+ *			2  device aborted the command (refused to identify itself)
+ */
+
+int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	struct ide_io_ports *io_ports = &hwif->io_ports;
+	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
+	int use_altstatus = 0, rc;
+	unsigned long timeout;
+	u8 s = 0, a = 0;
+
+	/*
+	 * Disable device IRQ.  Otherwise we'll get spurious interrupts
+	 * during the identify phase that the IRQ handler isn't expecting.
+	 */
+	if (io_ports->ctl_addr)
+		tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
+
+	/* take a deep breath */
+	if (irq_ctx)
+		mdelay(50);
+	else
+		msleep(50);
+
+	if (io_ports->ctl_addr &&
+	    (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
+		a = tp_ops->read_altstatus(hwif);
+		s = tp_ops->read_status(hwif);
+		if ((a ^ s) & ~ATA_SENSE)
+			/* ancient Seagate drives, broken interfaces */
+			printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
+					 "instead of ALTSTATUS(0x%02x)\n",
+					 drive->name, s, a);
+		else
+			/* use non-intrusive polling */
+			use_altstatus = 1;
+	}
+
+	/* set features register for atapi
+	 * identify command to be sure of reply
+	 */
+	if (cmd == ATA_CMD_ID_ATAPI) {
+		struct ide_taskfile tf;
+
+		memset(&tf, 0, sizeof(tf));
+		/* disable DMA & overlap */
+		tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
+	}
+
+	/* ask drive for ID */
+	tp_ops->exec_command(hwif, cmd);
+
+	timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
+
+	/* wait for IRQ and ATA_DRQ */
+	if (irq_ctx) {
+		rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s);
+		if (rc)
+			return 1;
+	} else {
+		rc = ide_busy_sleep(drive, timeout, use_altstatus);
+		if (rc)
+			return 1;
+
+		msleep(50);
+		s = tp_ops->read_status(hwif);
+	}
+
+	if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
+		/* drive returned ID */
+		do_identify(drive, cmd, id);
+		/* drive responded with ID */
+		rc = 0;
+		/* clear drive IRQ */
+		(void)tp_ops->read_status(hwif);
+	} else {
+		/* drive refused ID */
+		rc = 2;
+	}
+	return rc;
+}
+
+int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	u8 stat;
+
+	timeout += jiffies;
+
+	do {
+		msleep(50);	/* give drive a breather */
+		stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
+				 : hwif->tp_ops->read_status(hwif);
+		if ((stat & ATA_BUSY) == 0)
+			return 0;
+	} while (time_before(jiffies, timeout));
+
+	printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__);
+
+	return 1;	/* drive timed-out */
+}
+
+static u8 ide_read_device(ide_drive_t *drive)
+{
+	struct ide_taskfile tf;
+
+	drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE);
+
+	return tf.device;
+}
+
+/**
+ *	do_probe		-	probe an IDE device
+ *	@drive: drive to probe
+ *	@cmd: command to use
+ *
+ *	do_probe() has the difficult job of finding a drive if it exists,
+ *	without getting hung up if it doesn't exist, without trampling on
+ *	ethernet cards, and without leaving any IRQs dangling to haunt us later.
+ *
+ *	If a drive is "known" to exist (from CMOS or kernel parameters),
+ *	but does not respond right away, the probe will "hang in there"
+ *	for the maximum wait time (about 30 seconds), otherwise it will
+ *	exit much more quickly.
+ *
+ * Returns:	0  device was identified
+ *		1  device timed-out (no response to identify request)
+ *		2  device aborted the command (refused to identify itself)
+ *		3  bad status from device (possible for ATAPI drives)
+ *		4  probe was not attempted because failure was obvious
+ */
+
+static int do_probe (ide_drive_t *drive, u8 cmd)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
+	u16 *id = drive->id;
+	int rc;
+	u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
+
+	/* avoid waiting for inappropriate probes */
+	if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
+		return 4;
+
+#ifdef DEBUG
+	printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
+		drive->name, present, drive->media,
+		(cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
+#endif
+
+	/* needed for some systems
+	 * (e.g. crw9624 as drive0 with disk as slave)
+	 */
+	msleep(50);
+	tp_ops->dev_select(drive);
+	msleep(50);
+
+	if (ide_read_device(drive) != drive->select && present == 0) {
+		if (drive->dn & 1) {
+			/* exit with drive0 selected */
+			tp_ops->dev_select(hwif->devices[0]);
+			/* allow ATA_BUSY to assert & clear */
+			msleep(50);
+		}
+		/* no i/f present: mmm.. this should be a 4 -ml */
+		return 3;
+	}
+
+	stat = tp_ops->read_status(hwif);
+
+	if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
+	    present || cmd == ATA_CMD_ID_ATAPI) {
+		rc = ide_dev_read_id(drive, cmd, id, 0);
+		if (rc)
+			/* failed: try again */
+			rc = ide_dev_read_id(drive, cmd, id, 0);
+
+		stat = tp_ops->read_status(hwif);
+
+		if (stat == (ATA_BUSY | ATA_DRDY))
+			return 4;
+
+		if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
+			printk(KERN_ERR "%s: no response (status = 0x%02x), "
+					"resetting drive\n", drive->name, stat);
+			msleep(50);
+			tp_ops->dev_select(drive);
+			msleep(50);
+			tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
+			(void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
+			rc = ide_dev_read_id(drive, cmd, id, 0);
+		}
+
+		/* ensure drive IRQ is clear */
+		stat = tp_ops->read_status(hwif);
+
+		if (rc == 1)
+			printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
+					drive->name, stat);
+	} else {
+		/* not present or maybe ATAPI */
+		rc = 3;
+	}
+	if (drive->dn & 1) {
+		/* exit with drive0 selected */
+		tp_ops->dev_select(hwif->devices[0]);
+		msleep(50);
+		/* ensure drive irq is clear */
+		(void)tp_ops->read_status(hwif);
+	}
+	return rc;
+}
+
+/**
+ *	probe_for_drives	-	upper level drive probe
+ *	@drive: drive to probe for
+ *
+ *	probe_for_drive() tests for existence of a given drive using do_probe()
+ *	and presents things to the user as needed.
+ *
+ *	Returns:	0  no device was found
+ *			1  device was found
+ *			   (note: IDE_DFLAG_PRESENT might still be not set)
+ */
+
+static u8 probe_for_drive(ide_drive_t *drive)
+{
+	char *m;
+	int rc;
+	u8 cmd;
+
+	drive->dev_flags &= ~IDE_DFLAG_ID_READ;
+
+	m = (char *)&drive->id[ATA_ID_PROD];
+	strcpy(m, "UNKNOWN");
+
+	/* skip probing? */
+	if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
+		/* if !(success||timed-out) */
+		cmd = ATA_CMD_ID_ATA;
+		rc = do_probe(drive, cmd);
+		if (rc >= 2) {
+			/* look for ATAPI device */
+			cmd = ATA_CMD_ID_ATAPI;
+			rc = do_probe(drive, cmd);
+		}
+
+		if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
+			return 0;
+
+		/* identification failed? */
+		if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
+			if (drive->media == ide_disk) {
+				printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
+					drive->name, drive->cyl,
+					drive->head, drive->sect);
+			} else if (drive->media == ide_cdrom) {
+				printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
+			} else {
+				/* nuke it */
+				printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
+				drive->dev_flags &= ~IDE_DFLAG_PRESENT;
+			}
+		} else {
+			if (cmd == ATA_CMD_ID_ATAPI)
+				ide_classify_atapi_dev(drive);
+			else
+				ide_classify_ata_dev(drive);
+		}
+	}
+
+	if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
+		return 0;
+
+	/* The drive wasn't being helpful. Add generic info only */
+	if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
+		generic_id(drive);
+		return 1;
+	}
+
+	if (drive->media == ide_disk) {
+		ide_disk_init_chs(drive);
+		ide_disk_init_mult_count(drive);
+	}
+
+	return 1;
+}
+
+static void hwif_release_dev(struct device *dev)
+{
+	ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
+
+	complete(&hwif->gendev_rel_comp);
+}
+
+static int ide_register_port(ide_hwif_t *hwif)
+{
+	int ret;
+
+	/* register with global device tree */
+	dev_set_name(&hwif->gendev, "%s", hwif->name);
+	dev_set_drvdata(&hwif->gendev, hwif);
+	if (hwif->gendev.parent == NULL)
+		hwif->gendev.parent = hwif->dev;
+	hwif->gendev.release = hwif_release_dev;
+
+	ret = device_register(&hwif->gendev);
+	if (ret < 0) {
+		printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
+			__func__, ret);
+		goto out;
+	}
+
+	hwif->portdev = device_create(ide_port_class, &hwif->gendev,
+				      MKDEV(0, 0), hwif, "%s", hwif->name);
+	if (IS_ERR(hwif->portdev)) {
+		ret = PTR_ERR(hwif->portdev);
+		device_unregister(&hwif->gendev);
+	}
+out:
+	return ret;
+}
+
+/**
+ *	ide_port_wait_ready	-	wait for port to become ready
+ *	@hwif: IDE port
+ *
+ *	This is needed on some PPCs and a bunch of BIOS-less embedded
+ *	platforms.  Typical cases are:
+ *
+ *	- The firmware hard reset the disk before booting the kernel,
+ *	  the drive is still doing it's poweron-reset sequence, that
+ *	  can take up to 30 seconds.
+ *
+ *	- The firmware does nothing (or no firmware), the device is
+ *	  still in POST state (same as above actually).
+ *
+ *	- Some CD/DVD/Writer combo drives tend to drive the bus during
+ *	  their reset sequence even when they are non-selected slave
+ *	  devices, thus preventing discovery of the main HD.
+ *
+ *	Doing this wait-for-non-busy should not harm any existing
+ *	configuration and fix some issues like the above.
+ *
+ *	BenH.
+ *
+ *	Returns 0 on success, error code (< 0) otherwise.
+ */
+
+static int ide_port_wait_ready(ide_hwif_t *hwif)
+{
+	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
+	ide_drive_t *drive;
+	int i, rc;
+
+	printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
+
+	/* Let HW settle down a bit from whatever init state we
+	 * come from */
+	mdelay(2);
+
+	/* Wait for BSY bit to go away, spec timeout is 30 seconds,
+	 * I know of at least one disk who takes 31 seconds, I use 35
+	 * here to be safe
+	 */
+	rc = ide_wait_not_busy(hwif, 35000);
+	if (rc)
+		return rc;
+
+	/* Now make sure both master & slave are ready */
+	ide_port_for_each_dev(i, drive, hwif) {
+		/* Ignore disks that we will not probe for later. */
+		if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
+		    (drive->dev_flags & IDE_DFLAG_PRESENT)) {
+			tp_ops->dev_select(drive);
+			tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
+			mdelay(2);
+			rc = ide_wait_not_busy(hwif, 35000);
+			if (rc)
+				goto out;
+		} else
+			printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
+					  drive->name);
+	}
+out:
+	/* Exit function with master reselected (let's be sane) */
+	if (i)
+		tp_ops->dev_select(hwif->devices[0]);
+
+	return rc;
+}
+
+/**
+ *	ide_undecoded_slave	-	look for bad CF adapters
+ *	@dev1: slave device
+ *
+ *	Analyse the drives on the interface and attempt to decide if we
+ *	have the same drive viewed twice. This occurs with crap CF adapters
+ *	and PCMCIA sometimes.
+ */
+
+void ide_undecoded_slave(ide_drive_t *dev1)
+{
+	ide_drive_t *dev0 = dev1->hwif->devices[0];
+
+	if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
+		return;
+
+	/* If the models don't match they are not the same product */
+	if (strcmp((char *)&dev0->id[ATA_ID_PROD],
+		   (char *)&dev1->id[ATA_ID_PROD]))
+		return;
+
+	/* Serial numbers do not match */
+	if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
+		    (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
+		return;
+
+	/* No serial number, thankfully very rare for CF */
+	if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
+		return;
+
+	/* Appears to be an IDE flash adapter with decode bugs */
+	printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
+
+	dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
+}
+
+EXPORT_SYMBOL_GPL(ide_undecoded_slave);
+
+static int ide_probe_port(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	unsigned int irqd;
+	int i, rc = -ENODEV;
+
+	BUG_ON(hwif->present);
+
+	if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
+	    (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
+		return -EACCES;
+
+	/*
+	 * We must always disable IRQ, as probe_for_drive will assert IRQ, but
+	 * we'll install our IRQ driver much later...
+	 */
+	irqd = hwif->irq;
+	if (irqd)
+		disable_irq(hwif->irq);
+
+	if (ide_port_wait_ready(hwif) == -EBUSY)
+		printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
+
+	/*
+	 * Second drive should only exist if first drive was found,
+	 * but a lot of cdrom drives are configured as single slaves.
+	 */
+	ide_port_for_each_dev(i, drive, hwif) {
+		(void) probe_for_drive(drive);
+		if (drive->dev_flags & IDE_DFLAG_PRESENT)
+			rc = 0;
+	}
+
+	/*
+	 * Use cached IRQ number. It might be (and is...) changed by probe
+	 * code above
+	 */
+	if (irqd)
+		enable_irq(irqd);
+
+	return rc;
+}
+
+static void ide_port_tune_devices(ide_hwif_t *hwif)
+{
+	const struct ide_port_ops *port_ops = hwif->port_ops;
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_present_dev(i, drive, hwif) {
+		ide_check_nien_quirk_list(drive);
+
+		if (port_ops && port_ops->quirkproc)
+			port_ops->quirkproc(drive);
+	}
+
+	ide_port_for_each_present_dev(i, drive, hwif) {
+		ide_set_max_pio(drive);
+
+		drive->dev_flags |= IDE_DFLAG_NICE1;
+
+		if (hwif->dma_ops)
+			ide_set_dma(drive);
+	}
+}
+
+static void ide_initialize_rq(struct request *rq)
+{
+	struct ide_request *req = blk_mq_rq_to_pdu(rq);
+
+	scsi_req_init(&req->sreq);
+	req->sreq.sense = req->sense;
+}
+
+/*
+ * init request queue
+ */
+static int ide_init_queue(ide_drive_t *drive)
+{
+	struct request_queue *q;
+	ide_hwif_t *hwif = drive->hwif;
+	int max_sectors = 256;
+	int max_sg_entries = PRD_ENTRIES;
+
+	/*
+	 *	Our default set up assumes the normal IDE case,
+	 *	that is 64K segmenting, standard PRD setup
+	 *	and LBA28. Some drivers then impose their own
+	 *	limits and LBA48 we could raise it but as yet
+	 *	do not.
+	 */
+	q = blk_alloc_queue_node(GFP_KERNEL, hwif_to_node(hwif), NULL);
+	if (!q)
+		return 1;
+
+	q->request_fn = do_ide_request;
+	q->initialize_rq_fn = ide_initialize_rq;
+	q->cmd_size = sizeof(struct ide_request);
+	blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
+	if (blk_init_allocated_queue(q) < 0) {
+		blk_cleanup_queue(q);
+		return 1;
+	}
+
+	q->queuedata = drive;
+	blk_queue_segment_boundary(q, 0xffff);
+
+	if (hwif->rqsize < max_sectors)
+		max_sectors = hwif->rqsize;
+	blk_queue_max_hw_sectors(q, max_sectors);
+
+#ifdef CONFIG_PCI
+	/* When we have an IOMMU, we may have a problem where pci_map_sg()
+	 * creates segments that don't completely match our boundary
+	 * requirements and thus need to be broken up again. Because it
+	 * doesn't align properly either, we may actually have to break up
+	 * to more segments than what was we got in the first place, a max
+	 * worst case is twice as many.
+	 * This will be fixed once we teach pci_map_sg() about our boundary
+	 * requirements, hopefully soon. *FIXME*
+	 */
+	max_sg_entries >>= 1;
+#endif /* CONFIG_PCI */
+
+	blk_queue_max_segments(q, max_sg_entries);
+
+	/* assign drive queue */
+	drive->queue = q;
+
+	return 0;
+}
+
+static DEFINE_MUTEX(ide_cfg_mtx);
+
+/*
+ * For any present drive:
+ * - allocate the block device queue
+ */
+static int ide_port_setup_devices(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	int i, j = 0;
+
+	mutex_lock(&ide_cfg_mtx);
+	ide_port_for_each_present_dev(i, drive, hwif) {
+		if (ide_init_queue(drive)) {
+			printk(KERN_ERR "ide: failed to init %s\n",
+					drive->name);
+			drive->dev_flags &= ~IDE_DFLAG_PRESENT;
+			continue;
+		}
+
+		j++;
+	}
+	mutex_unlock(&ide_cfg_mtx);
+
+	return j;
+}
+
+static void ide_host_enable_irqs(struct ide_host *host)
+{
+	ide_hwif_t *hwif;
+	int i;
+
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif == NULL)
+			continue;
+
+		/* clear any pending IRQs */
+		hwif->tp_ops->read_status(hwif);
+
+		/* unmask IRQs */
+		if (hwif->io_ports.ctl_addr)
+			hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
+	}
+}
+
+/*
+ * This routine sets up the IRQ for an IDE interface.
+ */
+static int init_irq (ide_hwif_t *hwif)
+{
+	struct ide_io_ports *io_ports = &hwif->io_ports;
+	struct ide_host *host = hwif->host;
+	irq_handler_t irq_handler = host->irq_handler;
+	int sa = host->irq_flags;
+
+	if (irq_handler == NULL)
+		irq_handler = ide_intr;
+
+	if (!host->get_lock)
+		if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
+			goto out_up;
+
+#if !defined(__mc68000__)
+	printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
+		io_ports->data_addr, io_ports->status_addr,
+		io_ports->ctl_addr, hwif->irq);
+#else
+	printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
+		io_ports->data_addr, hwif->irq);
+#endif /* __mc68000__ */
+	if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
+		printk(KERN_CONT " (serialized)");
+	printk(KERN_CONT "\n");
+
+	return 0;
+out_up:
+	return 1;
+}
+
+static int ata_lock(dev_t dev, void *data)
+{
+	/* FIXME: we want to pin hwif down */
+	return 0;
+}
+
+static struct kobject *ata_probe(dev_t dev, int *part, void *data)
+{
+	ide_hwif_t *hwif = data;
+	int unit = *part >> PARTN_BITS;
+	ide_drive_t *drive = hwif->devices[unit];
+
+	if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
+		return NULL;
+
+	if (drive->media == ide_disk)
+		request_module("ide-disk");
+	if (drive->media == ide_cdrom || drive->media == ide_optical)
+		request_module("ide-cd");
+	if (drive->media == ide_tape)
+		request_module("ide-tape");
+	if (drive->media == ide_floppy)
+		request_module("ide-floppy");
+
+	return NULL;
+}
+
+static struct kobject *exact_match(dev_t dev, int *part, void *data)
+{
+	struct gendisk *p = data;
+	*part &= (1 << PARTN_BITS) - 1;
+	return &disk_to_dev(p)->kobj;
+}
+
+static int exact_lock(dev_t dev, void *data)
+{
+	struct gendisk *p = data;
+
+	if (!get_disk_and_module(p))
+		return -1;
+	return 0;
+}
+
+void ide_register_region(struct gendisk *disk)
+{
+	blk_register_region(MKDEV(disk->major, disk->first_minor),
+			    disk->minors, NULL, exact_match, exact_lock, disk);
+}
+
+EXPORT_SYMBOL_GPL(ide_register_region);
+
+void ide_unregister_region(struct gendisk *disk)
+{
+	blk_unregister_region(MKDEV(disk->major, disk->first_minor),
+			      disk->minors);
+}
+
+EXPORT_SYMBOL_GPL(ide_unregister_region);
+
+void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	unsigned int unit = drive->dn & 1;
+
+	disk->major = hwif->major;
+	disk->first_minor = unit << PARTN_BITS;
+	sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
+	disk->queue = drive->queue;
+}
+
+EXPORT_SYMBOL_GPL(ide_init_disk);
+
+static void drive_release_dev (struct device *dev)
+{
+	ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
+
+	ide_proc_unregister_device(drive);
+
+	blk_cleanup_queue(drive->queue);
+	drive->queue = NULL;
+
+	drive->dev_flags &= ~IDE_DFLAG_PRESENT;
+
+	complete(&drive->gendev_rel_comp);
+}
+
+static int hwif_init(ide_hwif_t *hwif)
+{
+	if (!hwif->irq) {
+		printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
+		return 0;
+	}
+
+	if (register_blkdev(hwif->major, hwif->name))
+		return 0;
+
+	if (!hwif->sg_max_nents)
+		hwif->sg_max_nents = PRD_ENTRIES;
+
+	hwif->sg_table = kmalloc_array(hwif->sg_max_nents,
+				       sizeof(struct scatterlist),
+				       GFP_KERNEL);
+	if (!hwif->sg_table) {
+		printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
+		goto out;
+	}
+
+	sg_init_table(hwif->sg_table, hwif->sg_max_nents);
+	
+	if (init_irq(hwif)) {
+		printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
+			hwif->name, hwif->irq);
+		goto out;
+	}
+
+	blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
+			    THIS_MODULE, ata_probe, ata_lock, hwif);
+	return 1;
+
+out:
+	unregister_blkdev(hwif->major, hwif->name);
+	return 0;
+}
+
+static void hwif_register_devices(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	unsigned int i;
+
+	ide_port_for_each_present_dev(i, drive, hwif) {
+		struct device *dev = &drive->gendev;
+		int ret;
+
+		dev_set_name(dev, "%u.%u", hwif->index, i);
+		dev_set_drvdata(dev, drive);
+		dev->parent = &hwif->gendev;
+		dev->bus = &ide_bus_type;
+		dev->release = drive_release_dev;
+
+		ret = device_register(dev);
+		if (ret < 0)
+			printk(KERN_WARNING "IDE: %s: device_register error: "
+					    "%d\n", __func__, ret);
+	}
+}
+
+static void ide_port_init_devices(ide_hwif_t *hwif)
+{
+	const struct ide_port_ops *port_ops = hwif->port_ops;
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_dev(i, drive, hwif) {
+		drive->dn = i + hwif->channel * 2;
+
+		if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
+			drive->io_32bit = 1;
+		if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
+			drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
+		if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
+			drive->dev_flags |= IDE_DFLAG_UNMASK;
+		if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
+			drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
+
+		drive->pio_mode = XFER_PIO_0;
+
+		if (port_ops && port_ops->init_dev)
+			port_ops->init_dev(drive);
+	}
+}
+
+static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
+			  const struct ide_port_info *d)
+{
+	hwif->channel = port;
+
+	hwif->chipset = d->chipset ? d->chipset : ide_pci;
+
+	if (d->init_iops)
+		d->init_iops(hwif);
+
+	/* ->host_flags may be set by ->init_iops (or even earlier...) */
+	hwif->host_flags |= d->host_flags;
+	hwif->pio_mask = d->pio_mask;
+
+	if (d->tp_ops)
+		hwif->tp_ops = d->tp_ops;
+
+	/* ->set_pio_mode for DTC2278 is currently limited to port 0 */
+	if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
+		hwif->port_ops = d->port_ops;
+
+	hwif->swdma_mask = d->swdma_mask;
+	hwif->mwdma_mask = d->mwdma_mask;
+	hwif->ultra_mask = d->udma_mask;
+
+	if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
+		int rc;
+
+		hwif->dma_ops = d->dma_ops;
+
+		if (d->init_dma)
+			rc = d->init_dma(hwif, d);
+		else
+			rc = ide_hwif_setup_dma(hwif, d);
+
+		if (rc < 0) {
+			printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
+
+			hwif->dma_ops = NULL;
+			hwif->dma_base = 0;
+			hwif->swdma_mask = 0;
+			hwif->mwdma_mask = 0;
+			hwif->ultra_mask = 0;
+		}
+	}
+
+	if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
+	    ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
+		hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
+
+	if (d->max_sectors)
+		hwif->rqsize = d->max_sectors;
+	else {
+		if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
+		    (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
+			hwif->rqsize = 256;
+		else
+			hwif->rqsize = 65536;
+	}
+
+	/* call chipset specific routine for each enabled port */
+	if (d->init_hwif)
+		d->init_hwif(hwif);
+}
+
+static void ide_port_cable_detect(ide_hwif_t *hwif)
+{
+	const struct ide_port_ops *port_ops = hwif->port_ops;
+
+	if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
+		if (hwif->cbl != ATA_CBL_PATA40_SHORT)
+			hwif->cbl = port_ops->cable_detect(hwif);
+	}
+}
+
+static const u8 ide_hwif_to_major[] =
+	{ IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
+	  IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
+
+static void ide_port_init_devices_data(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_dev(i, drive, hwif) {
+		u8 j = (hwif->index * MAX_DRIVES) + i;
+		u16 *saved_id = drive->id;
+		struct request *saved_sense_rq = drive->sense_rq;
+
+		memset(drive, 0, sizeof(*drive));
+		memset(saved_id, 0, SECTOR_SIZE);
+		drive->id = saved_id;
+		drive->sense_rq = saved_sense_rq;
+
+		drive->media			= ide_disk;
+		drive->select			= (i << 4) | ATA_DEVICE_OBS;
+		drive->hwif			= hwif;
+		drive->ready_stat		= ATA_DRDY;
+		drive->bad_wstat		= BAD_W_STAT;
+		drive->special_flags		= IDE_SFLAG_RECALIBRATE |
+						  IDE_SFLAG_SET_GEOMETRY;
+		drive->name[0]			= 'h';
+		drive->name[1]			= 'd';
+		drive->name[2]			= 'a' + j;
+		drive->max_failures		= IDE_DEFAULT_MAX_FAILURES;
+
+		INIT_LIST_HEAD(&drive->list);
+		init_completion(&drive->gendev_rel_comp);
+	}
+}
+
+static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
+{
+	/* fill in any non-zero initial values */
+	hwif->index	= index;
+	hwif->major	= ide_hwif_to_major[index];
+
+	hwif->name[0]	= 'i';
+	hwif->name[1]	= 'd';
+	hwif->name[2]	= 'e';
+	hwif->name[3]	= '0' + index;
+
+	spin_lock_init(&hwif->lock);
+
+	timer_setup(&hwif->timer, ide_timer_expiry, 0);
+
+	init_completion(&hwif->gendev_rel_comp);
+
+	hwif->tp_ops = &default_tp_ops;
+
+	ide_port_init_devices_data(hwif);
+}
+
+static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
+{
+	memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
+	hwif->irq = hw->irq;
+	hwif->dev = hw->dev;
+	hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
+	hwif->config_data = hw->config;
+}
+
+static unsigned int ide_indexes;
+
+/**
+ *	ide_find_port_slot	-	find free port slot
+ *	@d: IDE port info
+ *
+ *	Return the new port slot index or -ENOENT if we are out of free slots.
+ */
+
+static int ide_find_port_slot(const struct ide_port_info *d)
+{
+	int idx = -ENOENT;
+	u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
+	u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
+
+	/*
+	 * Claim an unassigned slot.
+	 *
+	 * Give preference to claiming other slots before claiming ide0/ide1,
+	 * just in case there's another interface yet-to-be-scanned
+	 * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
+	 *
+	 * Unless there is a bootable card that does not use the standard
+	 * ports 0x1f0/0x170 (the ide0/ide1 defaults).
+	 */
+	mutex_lock(&ide_cfg_mtx);
+	if (bootable) {
+		if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
+			idx = ffz(ide_indexes | i);
+	} else {
+		if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
+			idx = ffz(ide_indexes | 3);
+		else if ((ide_indexes & 3) != 3)
+			idx = ffz(ide_indexes);
+	}
+	if (idx >= 0)
+		ide_indexes |= (1 << idx);
+	mutex_unlock(&ide_cfg_mtx);
+
+	return idx;
+}
+
+static void ide_free_port_slot(int idx)
+{
+	mutex_lock(&ide_cfg_mtx);
+	ide_indexes &= ~(1 << idx);
+	mutex_unlock(&ide_cfg_mtx);
+}
+
+static void ide_port_free_devices(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_dev(i, drive, hwif) {
+		kfree(drive->sense_rq);
+		kfree(drive->id);
+		kfree(drive);
+	}
+}
+
+static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
+{
+	ide_drive_t *drive;
+	int i;
+
+	for (i = 0; i < MAX_DRIVES; i++) {
+		drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
+		if (drive == NULL)
+			goto out_nomem;
+
+		/*
+		 * In order to keep things simple we have an id
+		 * block for all drives at all times. If the device
+		 * is pre ATA or refuses ATA/ATAPI identify we
+		 * will add faked data to this.
+		 *
+		 * Also note that 0 everywhere means "can't do X"
+		 */
+		drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
+		if (drive->id == NULL)
+			goto out_free_drive;
+
+		drive->sense_rq = kmalloc(sizeof(struct request) +
+				sizeof(struct ide_request), GFP_KERNEL);
+		if (!drive->sense_rq)
+			goto out_free_id;
+
+		hwif->devices[i] = drive;
+	}
+	return 0;
+
+out_free_id:
+	kfree(drive->id);
+out_free_drive:
+	kfree(drive);
+out_nomem:
+	ide_port_free_devices(hwif);
+	return -ENOMEM;
+}
+
+struct ide_host *ide_host_alloc(const struct ide_port_info *d,
+				struct ide_hw **hws, unsigned int n_ports)
+{
+	struct ide_host *host;
+	struct device *dev = hws[0] ? hws[0]->dev : NULL;
+	int node = dev ? dev_to_node(dev) : -1;
+	int i;
+
+	host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
+	if (host == NULL)
+		return NULL;
+
+	for (i = 0; i < n_ports; i++) {
+		ide_hwif_t *hwif;
+		int idx;
+
+		if (hws[i] == NULL)
+			continue;
+
+		hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
+		if (hwif == NULL)
+			continue;
+
+		if (ide_port_alloc_devices(hwif, node) < 0) {
+			kfree(hwif);
+			continue;
+		}
+
+		idx = ide_find_port_slot(d);
+		if (idx < 0) {
+			printk(KERN_ERR "%s: no free slot for interface\n",
+					d ? d->name : "ide");
+			ide_port_free_devices(hwif);
+			kfree(hwif);
+			continue;
+		}
+
+		ide_init_port_data(hwif, idx);
+
+		hwif->host = host;
+
+		host->ports[i] = hwif;
+		host->n_ports++;
+	}
+
+	if (host->n_ports == 0) {
+		kfree(host);
+		return NULL;
+	}
+
+	host->dev[0] = dev;
+
+	if (d) {
+		host->init_chipset = d->init_chipset;
+		host->get_lock     = d->get_lock;
+		host->release_lock = d->release_lock;
+		host->host_flags = d->host_flags;
+		host->irq_flags = d->irq_flags;
+	}
+
+	return host;
+}
+EXPORT_SYMBOL_GPL(ide_host_alloc);
+
+static void ide_port_free(ide_hwif_t *hwif)
+{
+	ide_port_free_devices(hwif);
+	ide_free_port_slot(hwif->index);
+	kfree(hwif);
+}
+
+static void ide_disable_port(ide_hwif_t *hwif)
+{
+	struct ide_host *host = hwif->host;
+	int i;
+
+	printk(KERN_INFO "%s: disabling port\n", hwif->name);
+
+	for (i = 0; i < MAX_HOST_PORTS; i++) {
+		if (host->ports[i] == hwif) {
+			host->ports[i] = NULL;
+			host->n_ports--;
+		}
+	}
+
+	ide_port_free(hwif);
+}
+
+int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
+		      struct ide_hw **hws)
+{
+	ide_hwif_t *hwif, *mate = NULL;
+	int i, j = 0;
+
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif == NULL) {
+			mate = NULL;
+			continue;
+		}
+
+		ide_init_port_hw(hwif, hws[i]);
+		ide_port_apply_params(hwif);
+
+		if ((i & 1) && mate) {
+			hwif->mate = mate;
+			mate->mate = hwif;
+		}
+
+		mate = (i & 1) ? NULL : hwif;
+
+		ide_init_port(hwif, i & 1, d);
+		ide_port_cable_detect(hwif);
+
+		hwif->port_flags |= IDE_PFLAG_PROBING;
+
+		ide_port_init_devices(hwif);
+	}
+
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif == NULL)
+			continue;
+
+		if (ide_probe_port(hwif) == 0)
+			hwif->present = 1;
+
+		hwif->port_flags &= ~IDE_PFLAG_PROBING;
+
+		if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
+		    hwif->mate == NULL || hwif->mate->present == 0) {
+			if (ide_register_port(hwif)) {
+				ide_disable_port(hwif);
+				continue;
+			}
+		}
+
+		if (hwif->present)
+			ide_port_tune_devices(hwif);
+	}
+
+	ide_host_enable_irqs(host);
+
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif == NULL)
+			continue;
+
+		if (hwif_init(hwif) == 0) {
+			printk(KERN_INFO "%s: failed to initialize IDE "
+					 "interface\n", hwif->name);
+			device_unregister(hwif->portdev);
+			device_unregister(&hwif->gendev);
+			ide_disable_port(hwif);
+			continue;
+		}
+
+		if (hwif->present)
+			if (ide_port_setup_devices(hwif) == 0) {
+				hwif->present = 0;
+				continue;
+			}
+
+		j++;
+
+		ide_acpi_init_port(hwif);
+
+		if (hwif->present)
+			ide_acpi_port_init_devices(hwif);
+	}
+
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif == NULL)
+			continue;
+
+		ide_sysfs_register_port(hwif);
+		ide_proc_register_port(hwif);
+
+		if (hwif->present) {
+			ide_proc_port_register_devices(hwif);
+			hwif_register_devices(hwif);
+		}
+	}
+
+	return j ? 0 : -1;
+}
+EXPORT_SYMBOL_GPL(ide_host_register);
+
+int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
+		 unsigned int n_ports, struct ide_host **hostp)
+{
+	struct ide_host *host;
+	int rc;
+
+	host = ide_host_alloc(d, hws, n_ports);
+	if (host == NULL)
+		return -ENOMEM;
+
+	rc = ide_host_register(host, d, hws);
+	if (rc) {
+		ide_host_free(host);
+		return rc;
+	}
+
+	if (hostp)
+		*hostp = host;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ide_host_add);
+
+static void __ide_port_unregister_devices(ide_hwif_t *hwif)
+{
+	ide_drive_t *drive;
+	int i;
+
+	ide_port_for_each_present_dev(i, drive, hwif) {
+		device_unregister(&drive->gendev);
+		wait_for_completion(&drive->gendev_rel_comp);
+	}
+}
+
+void ide_port_unregister_devices(ide_hwif_t *hwif)
+{
+	mutex_lock(&ide_cfg_mtx);
+	__ide_port_unregister_devices(hwif);
+	hwif->present = 0;
+	ide_port_init_devices_data(hwif);
+	mutex_unlock(&ide_cfg_mtx);
+}
+EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
+
+/**
+ *	ide_unregister		-	free an IDE interface
+ *	@hwif: IDE interface
+ *
+ *	Perform the final unregister of an IDE interface.
+ *
+ *	Locking:
+ *	The caller must not hold the IDE locks.
+ *
+ *	It is up to the caller to be sure there is no pending I/O here,
+ *	and that the interface will not be reopened (present/vanishing
+ *	locking isn't yet done BTW).
+ */
+
+static void ide_unregister(ide_hwif_t *hwif)
+{
+	BUG_ON(in_interrupt());
+	BUG_ON(irqs_disabled());
+
+	mutex_lock(&ide_cfg_mtx);
+
+	if (hwif->present) {
+		__ide_port_unregister_devices(hwif);
+		hwif->present = 0;
+	}
+
+	ide_proc_unregister_port(hwif);
+
+	if (!hwif->host->get_lock)
+		free_irq(hwif->irq, hwif);
+
+	device_unregister(hwif->portdev);
+	device_unregister(&hwif->gendev);
+	wait_for_completion(&hwif->gendev_rel_comp);
+
+	/*
+	 * Remove us from the kernel's knowledge
+	 */
+	blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
+	kfree(hwif->sg_table);
+	unregister_blkdev(hwif->major, hwif->name);
+
+	ide_release_dma_engine(hwif);
+
+	mutex_unlock(&ide_cfg_mtx);
+}
+
+void ide_host_free(struct ide_host *host)
+{
+	ide_hwif_t *hwif;
+	int i;
+
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif)
+			ide_port_free(hwif);
+	}
+
+	kfree(host);
+}
+EXPORT_SYMBOL_GPL(ide_host_free);
+
+void ide_host_remove(struct ide_host *host)
+{
+	ide_hwif_t *hwif;
+	int i;
+
+	ide_host_for_each_port(i, hwif, host) {
+		if (hwif)
+			ide_unregister(hwif);
+	}
+
+	ide_host_free(host);
+}
+EXPORT_SYMBOL_GPL(ide_host_remove);
+
+void ide_port_scan(ide_hwif_t *hwif)
+{
+	int rc;
+
+	ide_port_apply_params(hwif);
+	ide_port_cable_detect(hwif);
+
+	hwif->port_flags |= IDE_PFLAG_PROBING;
+
+	ide_port_init_devices(hwif);
+
+	rc = ide_probe_port(hwif);
+
+	hwif->port_flags &= ~IDE_PFLAG_PROBING;
+
+	if (rc < 0)
+		return;
+
+	hwif->present = 1;
+
+	ide_port_tune_devices(hwif);
+	ide_port_setup_devices(hwif);
+	ide_acpi_port_init_devices(hwif);
+	hwif_register_devices(hwif);
+	ide_proc_port_register_devices(hwif);
+}
+EXPORT_SYMBOL_GPL(ide_port_scan);