Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1421 insertions, 0 deletions

diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
new file mode 100644
index 0000000..554473a
--- /dev/null
+++ b/drivers/ide/ide-probe.c
@@ -0,0 +1,1421 @@
+/*
+ *  linux/drivers/ide/ide-probe.c	Version 1.11	Mar 05, 2003
+ *
+ *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
+ */
+
+/*
+ *  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.
+ *
+ * Version 1.00		move drive probing code from ide.c to ide-probe.c
+ * Version 1.01		fix compilation problem for m68k
+ * Version 1.02		increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
+ *			 by Andrea Arcangeli
+ * Version 1.03		fix for (hwif->chipset == ide_4drives)
+ * Version 1.04		fixed buggy treatments of known flash memory cards
+ *
+ * Version 1.05		fix for (hwif->chipset == ide_pdc4030)
+ *			added ide6/7/8/9
+ *			allowed for secondary flash card to be detectable
+ *			 with new flag : drive->ata_flash : 1;
+ * Version 1.06		stream line request queue and prep for cascade project.
+ * Version 1.07		max_sect <= 255; slower disks would get behind and
+ * 			then fall over when they get to 256.	Paul G.
+ * Version 1.10		Update set for new IDE. drive->id is now always
+ *			valid after probe time even with noprobe
+ */
+
+#undef REALLY_SLOW_IO		/* most systems can safely undef this */
+
+#include <linux/config.h>
+#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 <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/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)
+{
+	drive->id->cyls = drive->cyl;
+	drive->id->heads = drive->head;
+	drive->id->sectors = drive->sect;
+	drive->id->cur_cyls = drive->cyl;
+	drive->id->cur_heads = drive->head;
+	drive->id->cur_sectors = drive->sect;
+}
+
+static void ide_disk_init_chs(ide_drive_t *drive)
+{
+	struct hd_driveid *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->cyls;
+		drive->head = drive->bios_head = id->heads;
+		drive->sect = drive->bios_sect = id->sectors;
+	}
+
+	/* Handle logical geometry translation by the drive */
+	if ((id->field_valid & 1) && id->cur_cyls &&
+	    id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
+		drive->cyl  = id->cur_cyls;
+		drive->head = id->cur_heads;
+		drive->sect = id->cur_sectors;
+	}
+
+	/* Use physical geometry if what we have still makes no sense */
+	if (drive->head > 16 && id->heads && id->heads <= 16) {
+		drive->cyl  = id->cyls;
+		drive->head = id->heads;
+		drive->sect = id->sectors;
+	}
+}
+
+static void ide_disk_init_mult_count(ide_drive_t *drive)
+{
+	struct hd_driveid *id = drive->id;
+
+	drive->mult_count = 0;
+	if (id->max_multsect) {
+#ifdef CONFIG_IDEDISK_MULTI_MODE
+		id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
+		id->multsect_valid = id->multsect ? 1 : 0;
+		drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
+		drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
+#else	/* original, pre IDE-NFG, per request of AC */
+		drive->mult_req = INITIAL_MULT_COUNT;
+		if (drive->mult_req > id->max_multsect)
+			drive->mult_req = id->max_multsect;
+		if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
+			drive->special.b.set_multmode = 1;
+#endif
+	}
+}
+
+/**
+ *	drive_is_flashcard	-	check for compact flash
+ *	@drive: drive to check
+ *
+ *	CompactFlash cards and their brethern pretend to be removable
+ *	hard disks, except:
+ * 		(1) they never have a slave unit, and
+ *		(2) they don't have doorlock mechanisms.
+ *	This test catches them, and is invoked elsewhere when setting
+ *	appropriate config bits.
+ *
+ *	FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD)
+ *	devices, so in linux 2.3.x we should change this to just treat all
+ *	PCMCIA  drives this way, and get rid of the model-name tests below
+ *	(too big of an interface change for 2.4.x).
+ *	At that time, we might also consider parameterizing the timeouts and
+ *	retries, since these are MUCH faster than mechanical drives. -M.Lord
+ */
+ 
+static inline int drive_is_flashcard (ide_drive_t *drive)
+{
+	struct hd_driveid *id = drive->id;
+
+	if (drive->removable) {
+		if (id->config == 0x848a) return 1;	/* CompactFlash */
+		if (!strncmp(id->model, "KODAK ATA_FLASH", 15)	/* Kodak */
+		 || !strncmp(id->model, "Hitachi CV", 10)	/* Hitachi */
+		 || !strncmp(id->model, "SunDisk SDCFB", 13)	/* old SanDisk */
+		 || !strncmp(id->model, "SanDisk SDCFB", 13)	/* SanDisk */
+		 || !strncmp(id->model, "HAGIWARA HPC", 12)	/* Hagiwara */
+		 || !strncmp(id->model, "LEXAR ATA_FLASH", 15)	/* Lexar */
+		 || !strncmp(id->model, "ATA_FLASH", 9))	/* Simple Tech */
+		{
+			return 1;	/* yes, it is a flash memory card */
+		}
+	}
+	return 0;	/* no, it is not a flash memory card */
+}
+
+/**
+ *	do_identify	-	identify a drive
+ *	@drive: drive to identify 
+ *	@cmd: command used
+ *
+ *	Called when we have issued a drive identify command to
+ *	read and parse the results. This function is run with
+ *	interrupts disabled. 
+ */
+ 
+static inline void do_identify (ide_drive_t *drive, u8 cmd)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	int bswap = 1;
+	struct hd_driveid *id;
+
+	id = drive->id;
+	/* read 512 bytes of id info */
+	hwif->ata_input_data(drive, id, SECTOR_WORDS);
+
+	drive->id_read = 1;
+	local_irq_enable();
+	ide_fix_driveid(id);
+
+#if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
+	/*
+	 * EATA SCSI controllers do a hardware ATA emulation:
+	 * Ignore them if there is a driver for them available.
+	 */
+	if ((id->model[0] == 'P' && id->model[1] == 'M') ||
+	    (id->model[0] == 'S' && id->model[1] == 'K')) {
+		printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
+		goto err_misc;
+	}
+#endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
+
+	/*
+	 *  WIN_IDENTIFY returns little-endian info,
+	 *  WIN_PIDENTIFY *usually* returns little-endian info.
+	 */
+	if (cmd == WIN_PIDENTIFY) {
+		if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
+		 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
+		 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
+			/* Vertos drives may still be weird */
+			bswap ^= 1;	
+	}
+	ide_fixstring(id->model,     sizeof(id->model),     bswap);
+	ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
+	ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
+
+	if (strstr(id->model, "E X A B Y T E N E S T"))
+		goto err_misc;
+
+	/* we depend on this a lot! */
+	id->model[sizeof(id->model)-1] = '\0';
+	printk("%s: %s, ", drive->name, id->model);
+	drive->present = 1;
+	drive->dead = 0;
+
+	/*
+	 * Check for an ATAPI device
+	 */
+	if (cmd == WIN_PIDENTIFY) {
+		u8 type = (id->config >> 8) & 0x1f;
+		printk("ATAPI ");
+		switch (type) {
+			case ide_floppy:
+				if (!strstr(id->model, "CD-ROM")) {
+					if (!strstr(id->model, "oppy") &&
+					    !strstr(id->model, "poyp") &&
+					    !strstr(id->model, "ZIP"))
+						printk("cdrom or floppy?, assuming ");
+					if (drive->media != ide_cdrom) {
+						printk ("FLOPPY");
+						drive->removable = 1;
+						break;
+					}
+				}
+				/* Early cdrom models used zero */
+				type = ide_cdrom;
+			case ide_cdrom:
+				drive->removable = 1;
+#ifdef CONFIG_PPC
+				/* kludge for Apple PowerBook internal zip */
+				if (!strstr(id->model, "CD-ROM") &&
+				    strstr(id->model, "ZIP")) {
+					printk ("FLOPPY");
+					type = ide_floppy;
+					break;
+				}
+#endif
+				printk ("CD/DVD-ROM");
+				break;
+			case ide_tape:
+				printk ("TAPE");
+				break;
+			case ide_optical:
+				printk ("OPTICAL");
+				drive->removable = 1;
+				break;
+			default:
+				printk("UNKNOWN (type %d)", type);
+				break;
+		}
+		printk (" drive\n");
+		drive->media = type;
+		/* an ATAPI device ignores DRDY */
+		drive->ready_stat = 0;
+		return;
+	}
+
+	/*
+	 * Not an ATAPI device: looks like a "regular" hard disk
+	 */
+	if (id->config & (1<<7))
+		drive->removable = 1;
+
+	if (drive_is_flashcard(drive))
+		drive->is_flash = 1;
+	drive->media = ide_disk;
+	printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
+	QUIRK_LIST(drive);
+	return;
+
+err_misc:
+	kfree(id);
+	drive->present = 0;
+	return;
+}
+
+/**
+ *	actual_try_to_identify	-	send ata/atapi identify
+ *	@drive: drive to identify
+ *	@cmd: command to use
+ *
+ *	try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
+ *	and waits for a response.  It also monitors irqs while this is
+ *	happening, in hope of automatically determining which one is
+ *	being used by the interface.
+ *
+ *	Returns:	0  device was identified
+ *			1  device timed-out (no response to identify request)
+ *			2  device aborted the command (refused to identify itself)
+ */
+
+static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	int rc;
+	unsigned long hd_status;
+	unsigned long timeout;
+	u8 s = 0, a = 0;
+
+	/* take a deep breath */
+	msleep(50);
+
+	if (IDE_CONTROL_REG) {
+		a = hwif->INB(IDE_ALTSTATUS_REG);
+		s = hwif->INB(IDE_STATUS_REG);
+		if ((a ^ s) & ~INDEX_STAT) {
+			printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
+				"ALTSTATUS(0x%02x)\n", drive->name, s, a);
+			/* ancient Seagate drives, broken interfaces */
+			hd_status = IDE_STATUS_REG;
+		} else {
+			/* use non-intrusive polling */
+			hd_status = IDE_ALTSTATUS_REG;
+		}
+	} else
+		hd_status = IDE_STATUS_REG;
+
+	/* set features register for atapi
+	 * identify command to be sure of reply
+	 */
+	if ((cmd == WIN_PIDENTIFY))
+		/* disable dma & overlap */
+		hwif->OUTB(0, IDE_FEATURE_REG);
+
+	/* ask drive for ID */
+	hwif->OUTB(cmd, IDE_COMMAND_REG);
+
+	timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
+	timeout += jiffies;
+	do {
+		if (time_after(jiffies, timeout)) {
+			/* drive timed-out */
+			return 1;
+		}
+		/* give drive a breather */
+		msleep(50);
+	} while ((hwif->INB(hd_status)) & BUSY_STAT);
+
+	/* wait for IRQ and DRQ_STAT */
+	msleep(50);
+	if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
+		unsigned long flags;
+
+		/* local CPU only; some systems need this */
+		local_irq_save(flags);
+		/* drive returned ID */
+		do_identify(drive, cmd);
+		/* drive responded with ID */
+		rc = 0;
+		/* clear drive IRQ */
+		(void) hwif->INB(IDE_STATUS_REG);
+		local_irq_restore(flags);
+	} else {
+		/* drive refused ID */
+		rc = 2;
+	}
+	return rc;
+}
+
+/**
+ *	try_to_identify	-	try to identify a drive
+ *	@drive: drive to probe
+ *	@cmd: command to use
+ *
+ *	Issue the identify command and then do IRQ probing to
+ *	complete the identification when needed by finding the
+ *	IRQ the drive is attached to
+ */
+ 
+static int try_to_identify (ide_drive_t *drive, u8 cmd)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	int retval;
+	int autoprobe = 0;
+	unsigned long cookie = 0;
+
+	/*
+	 * Disable device irq unless we need to
+	 * probe for it. Otherwise we'll get spurious
+	 * interrupts during the identify-phase that
+	 * the irq handler isn't expecting.
+	 */
+	if (IDE_CONTROL_REG) {
+		u8 ctl = drive->ctl | 2;
+		if (!hwif->irq) {
+			autoprobe = 1;
+			cookie = probe_irq_on();
+			/* enable device irq */
+			ctl &= ~2;
+		}
+		hwif->OUTB(ctl, IDE_CONTROL_REG);
+	}
+
+	retval = actual_try_to_identify(drive, cmd);
+
+	if (autoprobe) {
+		int irq;
+		/* mask device irq */
+		hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
+		/* clear drive IRQ */
+		(void) hwif->INB(IDE_STATUS_REG);
+		udelay(5);
+		irq = probe_irq_off(cookie);
+		if (!hwif->irq) {
+			if (irq > 0) {
+				hwif->irq = irq;
+			} else {
+				/* Mmmm.. multiple IRQs..
+				 * don't know which was ours
+				 */
+				printk("%s: IRQ probe failed (0x%lx)\n",
+					drive->name, cookie);
+			}
+		}
+	}
+	return retval;
+}
+
+
+/**
+ *	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)
+{
+	int rc;
+	ide_hwif_t *hwif = HWIF(drive);
+
+	if (drive->present) {
+		/* avoid waiting for inappropriate probes */
+		if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
+			return 4;
+	}
+#ifdef DEBUG
+	printk("probing for %s: present=%d, media=%d, probetype=%s\n",
+		drive->name, drive->present, drive->media,
+		(cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
+#endif
+
+	/* needed for some systems
+	 * (e.g. crw9624 as drive0 with disk as slave)
+	 */
+	msleep(50);
+	SELECT_DRIVE(drive);
+	msleep(50);
+	if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
+		if (drive->select.b.unit != 0) {
+			/* exit with drive0 selected */
+			SELECT_DRIVE(&hwif->drives[0]);
+			/* allow BUSY_STAT to assert & clear */
+			msleep(50);
+		}
+		/* no i/f present: mmm.. this should be a 4 -ml */
+		return 3;
+	}
+
+	if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
+	    drive->present || cmd == WIN_PIDENTIFY) {
+		/* send cmd and wait */
+		if ((rc = try_to_identify(drive, cmd))) {
+			/* failed: try again */
+			rc = try_to_identify(drive,cmd);
+		}
+		if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
+			return 4;
+
+		if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
+			((drive->autotune == IDE_TUNE_DEFAULT) ||
+			(drive->autotune == IDE_TUNE_AUTO))) {
+			unsigned long timeout;
+			printk("%s: no response (status = 0x%02x), "
+				"resetting drive\n", drive->name,
+				hwif->INB(IDE_STATUS_REG));
+			msleep(50);
+			hwif->OUTB(drive->select.all, IDE_SELECT_REG);
+			msleep(50);
+			hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
+			timeout = jiffies;
+			while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
+			       time_before(jiffies, timeout + WAIT_WORSTCASE))
+				msleep(50);
+			rc = try_to_identify(drive, cmd);
+		}
+		if (rc == 1)
+			printk("%s: no response (status = 0x%02x)\n",
+				drive->name, hwif->INB(IDE_STATUS_REG));
+		/* ensure drive irq is clear */
+		(void) hwif->INB(IDE_STATUS_REG);
+	} else {
+		/* not present or maybe ATAPI */
+		rc = 3;
+	}
+	if (drive->select.b.unit != 0) {
+		/* exit with drive0 selected */
+		SELECT_DRIVE(&hwif->drives[0]);
+		msleep(50);
+		/* ensure drive irq is clear */
+		(void) hwif->INB(IDE_STATUS_REG);
+	}
+	return rc;
+}
+
+/*
+ *
+ */
+static void enable_nest (ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = HWIF(drive);
+	unsigned long timeout;
+
+	printk("%s: enabling %s -- ", hwif->name, drive->id->model);
+	SELECT_DRIVE(drive);
+	msleep(50);
+	hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
+	timeout = jiffies + WAIT_WORSTCASE;
+	do {
+		if (time_after(jiffies, timeout)) {
+			printk("failed (timeout)\n");
+			return;
+		}
+		msleep(50);
+	} while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
+
+	msleep(50);
+
+	if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
+		printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
+	} else {
+		printk("success\n");
+	}
+
+	/* if !(success||timed-out) */
+	if (do_probe(drive, WIN_IDENTIFY) >= 2) {
+		/* look for ATAPI device */
+		(void) do_probe(drive, WIN_PIDENTIFY);
+	}
+}
+
+/**
+ *	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: drive->present might
+ *			   still be 0)
+ */
+ 
+static inline u8 probe_for_drive (ide_drive_t *drive)
+{
+	/*
+	 *	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 = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
+	drive->id_read = 0;
+	if(drive->id == NULL)
+	{
+		printk(KERN_ERR "ide: out of memory for id data.\n");
+		return 0;
+	}
+	memset(drive->id, 0, SECTOR_WORDS * 4);
+	strcpy(drive->id->model, "UNKNOWN");
+	
+	/* skip probing? */
+	if (!drive->noprobe)
+	{
+		/* if !(success||timed-out) */
+		if (do_probe(drive, WIN_IDENTIFY) >= 2) {
+			/* look for ATAPI device */
+			(void) do_probe(drive, WIN_PIDENTIFY);
+		}
+		if (strstr(drive->id->model, "E X A B Y T E N E S T"))
+			enable_nest(drive);
+		if (!drive->present)
+			/* drive not found */
+			return 0;
+	
+		/* identification failed? */
+		if (!drive->id_read) {
+			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->present = 0;
+			}
+		}
+		/* drive was found */
+	}
+	if(!drive->present)
+		return 0;
+	/* The drive wasn't being helpful. Add generic info only */
+	if (drive->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 drive->present;
+}
+
+static void hwif_release_dev (struct device *dev)
+{
+	ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
+
+	up(&hwif->gendev_rel_sem);
+}
+
+static void hwif_register (ide_hwif_t *hwif)
+{
+	/* register with global device tree */
+	strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
+	hwif->gendev.driver_data = hwif;
+	if (hwif->gendev.parent == NULL) {
+		if (hwif->pci_dev)
+			hwif->gendev.parent = &hwif->pci_dev->dev;
+		else
+			/* Would like to do = &device_legacy */
+			hwif->gendev.parent = NULL;
+	}
+	hwif->gendev.release = hwif_release_dev;
+	device_register(&hwif->gendev);
+}
+
+static int wait_hwif_ready(ide_hwif_t *hwif)
+{
+	int 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 */
+	SELECT_DRIVE(&hwif->drives[0]);
+	hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
+	mdelay(2);
+	rc = ide_wait_not_busy(hwif, 10000);
+	if (rc)
+		return rc;
+	SELECT_DRIVE(&hwif->drives[1]);
+	hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
+	mdelay(2);
+	rc = ide_wait_not_busy(hwif, 10000);
+
+	/* Exit function with master reselected (let's be sane) */
+	SELECT_DRIVE(&hwif->drives[0]);
+	
+	return rc;
+}
+
+/**
+ *	ide_undecoded_slave	-	look for bad CF adapters
+ *	@hwif: interface
+ *
+ *	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_hwif_t *hwif)
+{
+	ide_drive_t *drive0 = &hwif->drives[0];
+	ide_drive_t *drive1 = &hwif->drives[1];
+
+	if (drive0->present == 0 || drive1->present == 0)
+		return;
+
+	/* If the models don't match they are not the same product */
+	if (strcmp(drive0->id->model, drive1->id->model))
+		return;
+
+	/* Serial numbers do not match */
+	if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
+		return;
+
+	/* No serial number, thankfully very rare for CF */
+	if (drive0->id->serial_no[0] == 0)
+		return;
+
+	/* Appears to be an IDE flash adapter with decode bugs */
+	printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
+
+	drive1->present = 0;
+}
+
+EXPORT_SYMBOL_GPL(ide_undecoded_slave);
+
+/*
+ * This routine only knows how to look for drive units 0 and 1
+ * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
+ */
+static void probe_hwif(ide_hwif_t *hwif)
+{
+	unsigned int unit;
+	unsigned long flags;
+	unsigned int irqd;
+
+	if (hwif->noprobe)
+		return;
+
+	if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
+	    (ide_hwif_request_regions(hwif))) {
+		u16 msgout = 0;
+		for (unit = 0; unit < MAX_DRIVES; ++unit) {
+			ide_drive_t *drive = &hwif->drives[unit];
+			if (drive->present) {
+				drive->present = 0;
+				printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
+					drive->name);
+				msgout = 1;
+			}
+		}
+		if (!msgout)
+			printk(KERN_ERR "%s: ports already in use, skipping probe\n",
+				hwif->name);
+		return;	
+	}
+
+	/*
+	 * 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);
+
+	local_irq_set(flags);
+
+	/* 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-busy should not harm any existing configuration
+	 *  (at least things won't be worse than what current code does, that
+	 *  is blindly go & talk to the drive) and fix some issues like the
+	 *  above.
+	 *  
+	 *  BenH.
+	 */
+	if (wait_hwif_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.
+	 */
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		ide_drive_t *drive = &hwif->drives[unit];
+		drive->dn = (hwif->channel ? 2 : 0) + unit;
+		(void) probe_for_drive(drive);
+		if (drive->present && !hwif->present) {
+			hwif->present = 1;
+			if (hwif->chipset != ide_4drives ||
+			    !hwif->mate || 
+			    !hwif->mate->present) {
+				hwif_register(hwif);
+			}
+		}
+	}
+	if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
+		unsigned long timeout = jiffies + WAIT_WORSTCASE;
+		u8 stat;
+
+		printk(KERN_WARNING "%s: reset\n", hwif->name);
+		hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
+		udelay(10);
+		hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
+		do {
+			msleep(50);
+			stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
+		} while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
+
+	}
+	local_irq_restore(flags);
+	/*
+	 * Use cached IRQ number. It might be (and is...) changed by probe
+	 * code above
+	 */
+	if (irqd)
+		enable_irq(irqd);
+
+	if (!hwif->present) {
+		ide_hwif_release_regions(hwif);
+		return;
+	}
+
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		ide_drive_t *drive = &hwif->drives[unit];
+
+		if (drive->present) {
+			if (hwif->tuneproc != NULL && 
+				drive->autotune == IDE_TUNE_AUTO)
+				/* auto-tune PIO mode */
+				hwif->tuneproc(drive, 255);
+
+			if (drive->autotune != IDE_TUNE_DEFAULT &&
+			    drive->autotune != IDE_TUNE_AUTO)
+				continue;
+
+			drive->nice1 = 1;
+
+			/*
+			 * MAJOR HACK BARF :-/
+			 *
+			 * FIXME: chipsets own this cruft!
+			 */
+			/*
+			 * Move here to prevent module loading clashing.
+			 */
+	//		drive->autodma = hwif->autodma;
+			if (hwif->ide_dma_check) {
+				/*
+				 * Force DMAing for the beginning of the check.
+				 * Some chipsets appear to do interesting
+				 * things, if not checked and cleared.
+				 *   PARANOIA!!!
+				 */
+				hwif->ide_dma_off_quietly(drive);
+#ifdef CONFIG_IDEDMA_ONLYDISK
+				if (drive->media == ide_disk)
+#endif
+					hwif->ide_dma_check(drive);
+			}
+		}
+	}
+}
+
+static int hwif_init(ide_hwif_t *hwif);
+
+int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
+{
+	probe_hwif(hwif);
+
+	if (fixup)
+		fixup(hwif);
+
+	if (!hwif_init(hwif)) {
+		printk(KERN_INFO "%s: failed to initialize IDE interface\n",
+				 hwif->name);
+		return -1;
+	}
+
+	if (hwif->present) {
+		u16 unit = 0;
+		for (unit = 0; unit < MAX_DRIVES; ++unit) {
+			ide_drive_t *drive = &hwif->drives[unit];
+			/* For now don't attach absent drives, we may
+			   want them on default or a new "empty" class
+			   for hotplug reprobing ? */
+			if (drive->present) {
+				ata_attach(drive);
+			}
+		}
+	}
+	return 0;
+}
+
+int probe_hwif_init(ide_hwif_t *hwif)
+{
+	return probe_hwif_init_with_fixup(hwif, NULL);
+}
+
+EXPORT_SYMBOL(probe_hwif_init);
+
+#if MAX_HWIFS > 1
+/*
+ * save_match() is used to simplify logic in init_irq() below.
+ *
+ * A loophole here is that we may not know about a particular
+ * hwif's irq until after that hwif is actually probed/initialized..
+ * This could be a problem for the case where an hwif is on a
+ * dual interface that requires serialization (eg. cmd640) and another
+ * hwif using one of the same irqs is initialized beforehand.
+ *
+ * This routine detects and reports such situations, but does not fix them.
+ */
+static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
+{
+	ide_hwif_t *m = *match;
+
+	if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
+		if (!new->hwgroup)
+			return;
+		printk("%s: potential irq problem with %s and %s\n",
+			hwif->name, new->name, m->name);
+	}
+	if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
+		*match = new;
+}
+#endif /* MAX_HWIFS > 1 */
+
+/*
+ * init request queue
+ */
+static int ide_init_queue(ide_drive_t *drive)
+{
+	request_queue_t *q;
+	ide_hwif_t *hwif = HWIF(drive);
+	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_init_queue(do_ide_request, &ide_lock);
+	if (!q)
+		return 1;
+
+	q->queuedata = drive;
+	blk_queue_segment_boundary(q, 0xffff);
+
+	if (!hwif->rqsize) {
+		if (hwif->no_lba48 || hwif->no_lba48_dma)
+			hwif->rqsize = 256;
+		else
+			hwif->rqsize = 65536;
+	}
+	if (hwif->rqsize < max_sectors)
+		max_sectors = hwif->rqsize;
+	blk_queue_max_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*
+	 */
+	if (!PCI_DMA_BUS_IS_PHYS)
+		max_sg_entries >>= 1;
+#endif /* CONFIG_PCI */
+
+	blk_queue_max_hw_segments(q, max_sg_entries);
+	blk_queue_max_phys_segments(q, max_sg_entries);
+
+	/* assign drive queue */
+	drive->queue = q;
+
+	/* needs drive->queue to be set */
+	ide_toggle_bounce(drive, 1);
+
+	/* enable led activity for disk drives only */
+	if (drive->media == ide_disk && hwif->led_act)
+		blk_queue_activity_fn(q, hwif->led_act, drive);
+
+	return 0;
+}
+
+/*
+ * This routine sets up the irq for an ide interface, and creates a new
+ * hwgroup for the irq/hwif if none was previously assigned.
+ *
+ * Much of the code is for correctly detecting/handling irq sharing
+ * and irq serialization situations.  This is somewhat complex because
+ * it handles static as well as dynamic (PCMCIA) IDE interfaces.
+ *
+ * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
+ * interrupts completely disabled.  This can be bad for interrupt latency,
+ * but anything else has led to problems on some machines.  We re-enable
+ * interrupts as much as we can safely do in most places.
+ */
+static int init_irq (ide_hwif_t *hwif)
+{
+	unsigned int index;
+	ide_hwgroup_t *hwgroup;
+	ide_hwif_t *match = NULL;
+
+
+	BUG_ON(in_interrupt());
+	BUG_ON(irqs_disabled());	
+	down(&ide_cfg_sem);
+	hwif->hwgroup = NULL;
+#if MAX_HWIFS > 1
+	/*
+	 * Group up with any other hwifs that share our irq(s).
+	 */
+	for (index = 0; index < MAX_HWIFS; index++) {
+		ide_hwif_t *h = &ide_hwifs[index];
+		if (h->hwgroup) {  /* scan only initialized hwif's */
+			if (hwif->irq == h->irq) {
+				hwif->sharing_irq = h->sharing_irq = 1;
+				if (hwif->chipset != ide_pci ||
+				    h->chipset != ide_pci) {
+					save_match(hwif, h, &match);
+				}
+			}
+			if (hwif->serialized) {
+				if (hwif->mate && hwif->mate->irq == h->irq)
+					save_match(hwif, h, &match);
+			}
+			if (h->serialized) {
+				if (h->mate && hwif->irq == h->mate->irq)
+					save_match(hwif, h, &match);
+			}
+		}
+	}
+#endif /* MAX_HWIFS > 1 */
+	/*
+	 * If we are still without a hwgroup, then form a new one
+	 */
+	if (match) {
+		hwgroup = match->hwgroup;
+		hwif->hwgroup = hwgroup;
+		/*
+		 * Link us into the hwgroup.
+		 * This must be done early, do ensure that unexpected_intr
+		 * can find the hwif and prevent irq storms.
+		 * No drives are attached to the new hwif, choose_drive
+		 * can't do anything stupid (yet).
+		 * Add ourself as the 2nd entry to the hwgroup->hwif
+		 * linked list, the first entry is the hwif that owns
+		 * hwgroup->handler - do not change that.
+		 */
+		spin_lock_irq(&ide_lock);
+		hwif->next = hwgroup->hwif->next;
+		hwgroup->hwif->next = hwif;
+		spin_unlock_irq(&ide_lock);
+	} else {
+		hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
+		if (!hwgroup)
+	       		goto out_up;
+
+		hwif->hwgroup = hwgroup;
+
+		memset(hwgroup, 0, sizeof(ide_hwgroup_t));
+		hwgroup->hwif     = hwif->next = hwif;
+		hwgroup->rq       = NULL;
+		hwgroup->handler  = NULL;
+		hwgroup->drive    = NULL;
+		hwgroup->busy     = 0;
+		init_timer(&hwgroup->timer);
+		hwgroup->timer.function = &ide_timer_expiry;
+		hwgroup->timer.data = (unsigned long) hwgroup;
+	}
+
+	/*
+	 * Allocate the irq, if not already obtained for another hwif
+	 */
+	if (!match || match->irq != hwif->irq) {
+		int sa = SA_INTERRUPT;
+#if defined(__mc68000__) || defined(CONFIG_APUS)
+		sa = SA_SHIRQ;
+#endif /* __mc68000__ || CONFIG_APUS */
+
+		if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
+			sa = SA_SHIRQ;
+#ifndef CONFIG_IDEPCI_SHARE_IRQ
+			sa |= SA_INTERRUPT;
+#endif /* CONFIG_IDEPCI_SHARE_IRQ */
+		}
+
+		if (hwif->io_ports[IDE_CONTROL_OFFSET])
+			/* clear nIEN */
+			hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
+
+		if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
+	       		goto out_unlink;
+	}
+
+	/*
+	 * For any present drive:
+	 * - allocate the block device queue
+	 * - link drive into the hwgroup
+	 */
+	for (index = 0; index < MAX_DRIVES; ++index) {
+		ide_drive_t *drive = &hwif->drives[index];
+		if (!drive->present)
+			continue;
+		if (ide_init_queue(drive)) {
+			printk(KERN_ERR "ide: failed to init %s\n",drive->name);
+			continue;
+		}
+		spin_lock_irq(&ide_lock);
+		if (!hwgroup->drive) {
+			/* first drive for hwgroup. */
+			drive->next = drive;
+			hwgroup->drive = drive;
+			hwgroup->hwif = HWIF(hwgroup->drive);
+		} else {
+			drive->next = hwgroup->drive->next;
+			hwgroup->drive->next = drive;
+		}
+		spin_unlock_irq(&ide_lock);
+	}
+
+#if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
+	printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
+		hwif->io_ports[IDE_DATA_OFFSET],
+		hwif->io_ports[IDE_DATA_OFFSET]+7,
+		hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
+#elif defined(__sparc__)
+	printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
+		hwif->io_ports[IDE_DATA_OFFSET],
+		hwif->io_ports[IDE_DATA_OFFSET]+7,
+		hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
+#else
+	printk("%s at 0x%08lx on irq %d", hwif->name,
+		hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
+#endif /* __mc68000__ && CONFIG_APUS */
+	if (match)
+		printk(" (%sed with %s)",
+			hwif->sharing_irq ? "shar" : "serializ", match->name);
+	printk("\n");
+	up(&ide_cfg_sem);
+	return 0;
+out_unlink:
+	spin_lock_irq(&ide_lock);
+	if (hwif->next == hwif) {
+		BUG_ON(match);
+		BUG_ON(hwgroup->hwif != hwif);
+		kfree(hwgroup);
+	} else {
+		ide_hwif_t *g;
+		g = hwgroup->hwif;
+		while (g->next != hwif)
+			g = g->next;
+		g->next = hwif->next;
+		if (hwgroup->hwif == hwif) {
+			/* Impossible. */
+			printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
+			hwgroup->hwif = g;
+		}
+		BUG_ON(hwgroup->hwif == hwif);
+	}
+	spin_unlock_irq(&ide_lock);
+out_up:
+	up(&ide_cfg_sem);
+	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->drives[unit];
+	if (!drive->present)
+		return NULL;
+
+	if (drive->media == ide_disk)
+		request_module("ide-disk");
+	if (drive->scsi)
+		request_module("ide-scsi");
+	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 &p->kobj;
+}
+
+static int exact_lock(dev_t dev, void *data)
+{
+	struct gendisk *p = data;
+
+	if (!get_disk(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->select.all >> 4) & 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);
+
+	up(&drive->gendev_rel_sem);
+}
+
+/*
+ * init_gendisk() (as opposed to ide_geninit) is called for each major device,
+ * after probing for drives, to allocate partition tables and other data
+ * structures needed for the routines in genhd.c.  ide_geninit() gets called
+ * somewhat later, during the partition check.
+ */
+static void init_gendisk (ide_hwif_t *hwif)
+{
+	unsigned int unit;
+
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		ide_drive_t * drive = &hwif->drives[unit];
+		ide_add_generic_settings(drive);
+		snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
+			 hwif->index,unit);
+		drive->gendev.parent = &hwif->gendev;
+		drive->gendev.bus = &ide_bus_type;
+		drive->gendev.driver_data = drive;
+		drive->gendev.release = drive_release_dev;
+		if (drive->present) {
+			device_register(&drive->gendev);
+			sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
+				(hwif->channel && hwif->mate) ?
+				hwif->mate->index : hwif->index,
+				hwif->channel, unit, drive->lun);
+		}
+	}
+	blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
+			THIS_MODULE, ata_probe, ata_lock, hwif);
+}
+
+static int hwif_init(ide_hwif_t *hwif)
+{
+	int old_irq;
+
+	/* Return success if no device is connected */
+	if (!hwif->present)
+		return 1;
+
+	if (!hwif->irq) {
+		if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
+		{
+			printk("%s: DISABLED, NO IRQ\n", hwif->name);
+			return (hwif->present = 0);
+		}
+	}
+#ifdef CONFIG_BLK_DEV_HD
+	if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
+		printk("%s: CANNOT SHARE IRQ WITH OLD "
+			"HARDDISK DRIVER (hd.c)\n", hwif->name);
+		return (hwif->present = 0);
+	}
+#endif /* CONFIG_BLK_DEV_HD */
+
+	/* we set it back to 1 if all is ok below */	
+	hwif->present = 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(sizeof(struct scatterlist)*hwif->sg_max_nents,
+				 GFP_KERNEL);
+	if (!hwif->sg_table) {
+		printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
+		goto out;
+	}
+	
+	if (init_irq(hwif) == 0)
+		goto done;
+
+	old_irq = hwif->irq;
+	/*
+	 *	It failed to initialise. Find the default IRQ for 
+	 *	this port and try that.
+	 */
+	if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
+		printk("%s: Disabled unable to get IRQ %d.\n",
+			hwif->name, old_irq);
+		goto out;
+	}
+	if (init_irq(hwif)) {
+		printk("%s: probed IRQ %d and default IRQ %d failed.\n",
+			hwif->name, old_irq, hwif->irq);
+		goto out;
+	}
+	printk("%s: probed IRQ %d failed, using default.\n",
+		hwif->name, hwif->irq);
+
+done:
+	init_gendisk(hwif);
+	hwif->present = 1;	/* success */
+	return 1;
+
+out:
+	unregister_blkdev(hwif->major, hwif->name);
+	return 0;
+}
+
+int ideprobe_init (void)
+{
+	unsigned int index;
+	int probe[MAX_HWIFS];
+
+	memset(probe, 0, MAX_HWIFS * sizeof(int));
+	for (index = 0; index < MAX_HWIFS; ++index)
+		probe[index] = !ide_hwifs[index].present;
+
+	for (index = 0; index < MAX_HWIFS; ++index)
+		if (probe[index])
+			probe_hwif(&ide_hwifs[index]);
+	for (index = 0; index < MAX_HWIFS; ++index)
+		if (probe[index])
+			hwif_init(&ide_hwifs[index]);
+	for (index = 0; index < MAX_HWIFS; ++index) {
+		if (probe[index]) {
+			ide_hwif_t *hwif = &ide_hwifs[index];
+			int unit;
+			if (!hwif->present)
+				continue;
+			if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
+				hwif->chipset = ide_generic;
+			for (unit = 0; unit < MAX_DRIVES; ++unit)
+				if (hwif->drives[unit].present)
+					ata_attach(&hwif->drives[unit]);
+		}
+	}
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(ideprobe_init);