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, 2269 insertions, 0 deletions

diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
new file mode 100644
index 00000000000..973dec799b5
--- /dev/null
+++ b/drivers/ide/ide.c
@@ -0,0 +1,2269 @@
+/*
+ *  linux/drivers/ide/ide.c		Version 7.00beta2	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 multiple IDE interface driver, as evolved from hd.c.
+ * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
+ *   (usually 14 & 15).
+ * There can be up to two drives per interface, as per the ATA-2 spec.
+ *
+ * Primary:    ide0, port 0x1f0; major=3;  hda is minor=0; hdb is minor=64
+ * Secondary:  ide1, port 0x170; major=22; hdc is minor=0; hdd is minor=64
+ * Tertiary:   ide2, port 0x???; major=33; hde is minor=0; hdf is minor=64
+ * Quaternary: ide3, port 0x???; major=34; hdg is minor=0; hdh is minor=64
+ * ...
+ *
+ *  From hd.c:
+ *  |
+ *  | It traverses the request-list, using interrupts to jump between functions.
+ *  | As nearly all functions can be called within interrupts, we may not sleep.
+ *  | Special care is recommended.  Have Fun!
+ *  |
+ *  | modified by Drew Eckhardt to check nr of hd's from the CMOS.
+ *  |
+ *  | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ *  | in the early extended-partition checks and added DM partitions.
+ *  |
+ *  | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
+ *  |
+ *  | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
+ *  | and general streamlining by Mark Lord (mlord@pobox.com).
+ *
+ *  October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
+ *
+ *	Mark Lord	(mlord@pobox.com)		(IDE Perf.Pkg)
+ *	Delman Lee	(delman@ieee.org)		("Mr. atdisk2")
+ *	Scott Snyder	(snyder@fnald0.fnal.gov)	(ATAPI IDE cd-rom)
+ *
+ *  This was a rewrite of just about everything from hd.c, though some original
+ *  code is still sprinkled about.  Think of it as a major evolution, with
+ *  inspiration from lots of linux users, esp.  hamish@zot.apana.org.au
+ *
+ *  Version 1.0 ALPHA	initial code, primary i/f working okay
+ *  Version 1.3 BETA	dual i/f on shared irq tested & working!
+ *  Version 1.4 BETA	added auto probing for irq(s)
+ *  Version 1.5 BETA	added ALPHA (untested) support for IDE cd-roms,
+ *  ...
+ * Version 5.50		allow values as small as 20 for idebus=
+ * Version 5.51		force non io_32bit in drive_cmd_intr()
+ *			change delay_10ms() to delay_50ms() to fix problems
+ * Version 5.52		fix incorrect invalidation of removable devices
+ *			add "hdx=slow" command line option
+ * Version 5.60		start to modularize the driver; the disk and ATAPI
+ *			 drivers can be compiled as loadable modules.
+ *			move IDE probe code to ide-probe.c
+ *			move IDE disk code to ide-disk.c
+ *			add support for generic IDE device subdrivers
+ *			add m68k code from Geert Uytterhoeven
+ *			probe all interfaces by default
+ *			add ioctl to (re)probe an interface
+ * Version 6.00		use per device request queues
+ *			attempt to optimize shared hwgroup performance
+ *			add ioctl to manually adjust bandwidth algorithms
+ *			add kerneld support for the probe module
+ *			fix bug in ide_error()
+ *			fix bug in the first ide_get_lock() call for Atari
+ *			don't flush leftover data for ATAPI devices
+ * Version 6.01		clear hwgroup->active while the hwgroup sleeps
+ *			support HDIO_GETGEO for floppies
+ * Version 6.02		fix ide_ack_intr() call
+ *			check partition table on floppies
+ * Version 6.03		handle bad status bit sequencing in ide_wait_stat()
+ * Version 6.10		deleted old entries from this list of updates
+ *			replaced triton.c with ide-dma.c generic PCI DMA
+ *			added support for BIOS-enabled UltraDMA
+ *			rename all "promise" things to "pdc4030"
+ *			fix EZ-DRIVE handling on small disks
+ * Version 6.11		fix probe error in ide_scan_devices()
+ *			fix ancient "jiffies" polling bugs
+ *			mask all hwgroup interrupts on each irq entry
+ * Version 6.12		integrate ioctl and proc interfaces
+ *			fix parsing of "idex=" command line parameter
+ * Version 6.13		add support for ide4/ide5 courtesy rjones@orchestream.com
+ * Version 6.14		fixed IRQ sharing among PCI devices
+ * Version 6.15		added SMP awareness to IDE drivers
+ * Version 6.16		fixed various bugs; even more SMP friendly
+ * Version 6.17		fix for newest EZ-Drive problem
+ * Version 6.18		default unpartitioned-disk translation now "BIOS LBA"
+ * Version 6.19		Re-design for a UNIFORM driver for all platforms,
+ *			  model based on suggestions from Russell King and
+ *			  Geert Uytterhoeven
+ *			Promise DC4030VL now supported.
+ *			add support for ide6/ide7
+ *			delay_50ms() changed to ide_delay_50ms() and exported.
+ * Version 6.20		Added/Fixed Generic ATA-66 support and hwif detection.
+ *			Added hdx=flash to allow for second flash disk
+ *			  detection w/o the hang loop.
+ *			Added support for ide8/ide9
+ *			Added idex=ata66 for the quirky chipsets that are
+ *			  ATA-66 compliant, but have yet to determine a method
+ *			  of verification of the 80c cable presence.
+ *			  Specifically Promise's PDC20262 chipset.
+ * Version 6.21		Fixing/Fixed SMP spinlock issue with insight from an old
+ *			  hat that clarified original low level driver design.
+ * Version 6.30		Added SMP support; fixed multmode issues.  -ml
+ * Version 6.31		Debug Share INTR's and request queue streaming
+ *			Native ATA-100 support
+ *			Prep for Cascades Project
+ * Version 7.00alpha	First named revision of ide rearrange
+ *
+ *  Some additional driver compile-time options are in ./include/linux/ide.h
+ *
+ *  To do, in likely order of completion:
+ *	- modify kernel to obtain BIOS geometry for drives on 2nd/3rd/4th i/f
+ *
+ */
+
+#define	REVISION	"Revision: 7.00alpha2"
+#define	VERSION		"Id: ide.c 7.00a2 20020906"
+
+#undef REALLY_SLOW_IO		/* most systems can safely undef this */
+
+#define _IDE_C			/* Tell ide.h it's really us */
+
+#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/blkpg.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/ide.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/completion.h>
+#include <linux/reboot.h>
+#include <linux/cdrom.h>
+#include <linux/seq_file.h>
+#include <linux/device.h>
+#include <linux/bitops.h>
+
+#include <asm/byteorder.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+
+/* default maximum number of failures */
+#define IDE_DEFAULT_MAX_FAILURES 	1
+
+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 int idebus_parameter;	/* holds the "idebus=" parameter */
+static int system_bus_speed;	/* holds what we think is VESA/PCI bus speed */
+static int initializing;	/* set while initializing built-in drivers */
+
+DECLARE_MUTEX(ide_cfg_sem);
+ __cacheline_aligned_in_smp DEFINE_SPINLOCK(ide_lock);
+
+#ifdef CONFIG_BLK_DEV_IDEPCI
+static int ide_scan_direction; /* THIS was formerly 2.2.x pci=reverse */
+#endif
+
+#ifdef CONFIG_IDEDMA_AUTO
+int noautodma = 0;
+#else
+int noautodma = 1;
+#endif
+
+EXPORT_SYMBOL(noautodma);
+
+/*
+ * This is declared extern in ide.h, for access by other IDE modules:
+ */
+ide_hwif_t ide_hwifs[MAX_HWIFS];	/* master data repository */
+
+EXPORT_SYMBOL(ide_hwifs);
+
+static struct list_head ide_drives = LIST_HEAD_INIT(ide_drives);
+
+/*
+ * Do not even *think* about calling this!
+ */
+static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
+{
+	unsigned int unit;
+
+	/* bulk initialize hwif & drive info with zeros */
+	memset(hwif, 0, sizeof(ide_hwif_t));
+
+	/* 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;
+
+	hwif->bus_state	= BUSSTATE_ON;
+
+	hwif->atapi_dma = 0;		/* disable all atapi dma */ 
+	hwif->ultra_mask = 0x80;	/* disable all ultra */
+	hwif->mwdma_mask = 0x80;	/* disable all mwdma */
+	hwif->swdma_mask = 0x80;	/* disable all swdma */
+
+	sema_init(&hwif->gendev_rel_sem, 0);
+
+	default_hwif_iops(hwif);
+	default_hwif_transport(hwif);
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		ide_drive_t *drive = &hwif->drives[unit];
+
+		drive->media			= ide_disk;
+		drive->select.all		= (unit<<4)|0xa0;
+		drive->hwif			= hwif;
+		drive->ctl			= 0x08;
+		drive->ready_stat		= READY_STAT;
+		drive->bad_wstat		= BAD_W_STAT;
+		drive->special.b.recalibrate	= 1;
+		drive->special.b.set_geometry	= 1;
+		drive->name[0]			= 'h';
+		drive->name[1]			= 'd';
+		drive->name[2]			= 'a' + (index * MAX_DRIVES) + unit;
+		drive->max_failures		= IDE_DEFAULT_MAX_FAILURES;
+		drive->using_dma		= 0;
+		drive->is_flash			= 0;
+		drive->vdma			= 0;
+		INIT_LIST_HEAD(&drive->list);
+		sema_init(&drive->gendev_rel_sem, 0);
+	}
+}
+
+static void init_hwif_default(ide_hwif_t *hwif, unsigned int index)
+{
+	hw_regs_t hw;
+
+	memset(&hw, 0, sizeof(hw_regs_t));
+
+	ide_init_hwif_ports(&hw, ide_default_io_base(index), 0, &hwif->irq);
+
+	memcpy(&hwif->hw, &hw, sizeof(hw));
+	memcpy(hwif->io_ports, hw.io_ports, sizeof(hw.io_ports));
+
+	hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
+#ifdef CONFIG_BLK_DEV_HD
+	if (hwif->io_ports[IDE_DATA_OFFSET] == HD_DATA)
+		hwif->noprobe = 1;	/* may be overridden by ide_setup() */
+#endif
+}
+
+extern void ide_arm_init(void);
+
+/*
+ * init_ide_data() sets reasonable default values into all fields
+ * of all instances of the hwifs and drives, but only on the first call.
+ * Subsequent calls have no effect (they don't wipe out anything).
+ *
+ * This routine is normally called at driver initialization time,
+ * but may also be called MUCH earlier during kernel "command-line"
+ * parameter processing.  As such, we cannot depend on any other parts
+ * of the kernel (such as memory allocation) to be functioning yet.
+ *
+ * This is too bad, as otherwise we could dynamically allocate the
+ * ide_drive_t structs as needed, rather than always consuming memory
+ * for the max possible number (MAX_HWIFS * MAX_DRIVES) of them.
+ *
+ * FIXME: We should stuff the setup data into __init and copy the
+ * relevant hwifs/allocate them properly during boot.
+ */
+#define MAGIC_COOKIE 0x12345678
+static void __init init_ide_data (void)
+{
+	ide_hwif_t *hwif;
+	unsigned int index;
+	static unsigned long magic_cookie = MAGIC_COOKIE;
+
+	if (magic_cookie != MAGIC_COOKIE)
+		return;		/* already initialized */
+	magic_cookie = 0;
+
+	/* Initialise all interface structures */
+	for (index = 0; index < MAX_HWIFS; ++index) {
+		hwif = &ide_hwifs[index];
+		init_hwif_data(hwif, index);
+		init_hwif_default(hwif, index);
+#if !defined(CONFIG_PPC32) || !defined(CONFIG_PCI)
+		hwif->irq = hwif->hw.irq =
+			ide_init_default_irq(hwif->io_ports[IDE_DATA_OFFSET]);
+#endif
+	}
+#ifdef CONFIG_IDE_ARM
+	initializing = 1;
+	ide_arm_init();
+	initializing = 0;
+#endif
+}
+
+/**
+ *	ide_system_bus_speed	-	guess bus speed
+ *
+ *	ide_system_bus_speed() returns what we think is the system VESA/PCI
+ *	bus speed (in MHz). This is used for calculating interface PIO timings.
+ *	The default is 40 for known PCI systems, 50 otherwise.
+ *	The "idebus=xx" parameter can be used to override this value.
+ *	The actual value to be used is computed/displayed the first time
+ *	through. Drivers should only use this as a last resort.
+ *
+ *	Returns a guessed speed in MHz.
+ */
+
+static int ide_system_bus_speed(void)
+{
+#ifdef CONFIG_PCI
+	static struct pci_device_id pci_default[] = {
+		{ PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID) },
+		{ }
+	};
+#else
+#define pci_default 0
+#endif /* CONFIG_PCI */
+
+	if (!system_bus_speed) {
+		if (idebus_parameter) {
+			/* user supplied value */
+			system_bus_speed = idebus_parameter;
+		} else if (pci_dev_present(pci_default)) {
+			/* safe default value for PCI */
+			system_bus_speed = 33;
+		} else {
+			/* safe default value for VESA and PCI */
+			system_bus_speed = 50;
+		}
+		printk(KERN_INFO "ide: Assuming %dMHz system bus speed "
+			"for PIO modes%s\n", system_bus_speed,
+			idebus_parameter ? "" : "; override with idebus=xx");
+	}
+	return system_bus_speed;
+}
+
+/*
+ *	drives_lock protects the list of drives, drivers_lock the
+ *	list of drivers.  Currently nobody takes both at once.
+ */
+
+static DEFINE_SPINLOCK(drives_lock);
+static DEFINE_SPINLOCK(drivers_lock);
+static LIST_HEAD(drivers);
+
+/* Iterator for the driver list. */
+
+static void *m_start(struct seq_file *m, loff_t *pos)
+{
+	struct list_head *p;
+	loff_t l = *pos;
+	spin_lock(&drivers_lock);
+	list_for_each(p, &drivers)
+		if (!l--)
+			return list_entry(p, ide_driver_t, drivers);
+	return NULL;
+}
+
+static void *m_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	struct list_head *p = ((ide_driver_t *)v)->drivers.next;
+	(*pos)++;
+	return p==&drivers ? NULL : list_entry(p, ide_driver_t, drivers);
+}
+
+static void m_stop(struct seq_file *m, void *v)
+{
+	spin_unlock(&drivers_lock);
+}
+
+static int show_driver(struct seq_file *m, void *v)
+{
+	ide_driver_t *driver = v;
+	seq_printf(m, "%s version %s\n", driver->name, driver->version);
+	return 0;
+}
+
+struct seq_operations ide_drivers_op = {
+	.start	= m_start,
+	.next	= m_next,
+	.stop	= m_stop,
+	.show	= show_driver
+};
+
+#ifdef CONFIG_PROC_FS
+struct proc_dir_entry *proc_ide_root;
+#endif
+
+static struct resource* hwif_request_region(ide_hwif_t *hwif,
+					    unsigned long addr, int num)
+{
+	struct resource *res = request_region(addr, num, hwif->name);
+
+	if (!res)
+		printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
+				hwif->name, addr, addr+num-1);
+	return res;
+}
+
+/**
+ *	ide_hwif_request_regions - request resources for IDE
+ *	@hwif: interface to use
+ *
+ *	Requests all the needed resources for an interface.
+ *	Right now core IDE code does this work which is deeply wrong.
+ *	MMIO leaves it to the controller driver,
+ *	PIO will migrate this way over time.
+ */
+
+int ide_hwif_request_regions(ide_hwif_t *hwif)
+{
+	unsigned long addr;
+	unsigned int i;
+
+	if (hwif->mmio == 2)
+		return 0;
+	BUG_ON(hwif->mmio == 1);
+	addr = hwif->io_ports[IDE_CONTROL_OFFSET];
+	if (addr && !hwif_request_region(hwif, addr, 1))
+		goto control_region_busy;
+	hwif->straight8 = 0;
+	addr = hwif->io_ports[IDE_DATA_OFFSET];
+	if ((addr | 7) == hwif->io_ports[IDE_STATUS_OFFSET]) {
+		if (!hwif_request_region(hwif, addr, 8))
+			goto data_region_busy;
+		hwif->straight8 = 1;
+		return 0;
+	}
+	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
+		addr = hwif->io_ports[i];
+		if (!hwif_request_region(hwif, addr, 1)) {
+			while (--i)
+				release_region(addr, 1);
+			goto data_region_busy;
+		}
+	}
+	return 0;
+
+data_region_busy:
+	addr = hwif->io_ports[IDE_CONTROL_OFFSET];
+	if (addr)
+		release_region(addr, 1);
+control_region_busy:
+	/* If any errors are return, we drop the hwif interface. */
+	return -EBUSY;
+}
+
+/**
+ *	ide_hwif_release_regions - free IDE resources
+ *
+ *	Note that we only release the standard ports,
+ *	and do not even try to handle any extra ports
+ *	allocated for weird IDE interface chipsets.
+ *
+ *	Note also that we don't yet handle mmio resources here. More
+ *	importantly our caller should be doing this so we need to 
+ *	restructure this as a helper function for drivers.
+ */
+
+void ide_hwif_release_regions(ide_hwif_t *hwif)
+{
+	u32 i = 0;
+
+	if (hwif->mmio == 2)
+		return;
+	if (hwif->io_ports[IDE_CONTROL_OFFSET])
+		release_region(hwif->io_ports[IDE_CONTROL_OFFSET], 1);
+	if (hwif->straight8) {
+		release_region(hwif->io_ports[IDE_DATA_OFFSET], 8);
+		return;
+	}
+	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
+		if (hwif->io_ports[i])
+			release_region(hwif->io_ports[i], 1);
+}
+
+/**
+ *	ide_hwif_restore	-	restore hwif to template
+ *	@hwif: hwif to update
+ *	@tmp_hwif: template
+ *
+ *	Restore hwif to a previous state by copying most settngs
+ *	from the template.
+ */
+
+static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
+{
+	hwif->hwgroup			= tmp_hwif->hwgroup;
+
+	hwif->gendev.parent		= tmp_hwif->gendev.parent;
+
+	hwif->proc			= tmp_hwif->proc;
+
+	hwif->major			= tmp_hwif->major;
+	hwif->straight8			= tmp_hwif->straight8;
+	hwif->bus_state			= tmp_hwif->bus_state;
+
+	hwif->atapi_dma			= tmp_hwif->atapi_dma;
+	hwif->ultra_mask		= tmp_hwif->ultra_mask;
+	hwif->mwdma_mask		= tmp_hwif->mwdma_mask;
+	hwif->swdma_mask		= tmp_hwif->swdma_mask;
+
+	hwif->chipset			= tmp_hwif->chipset;
+	hwif->hold			= tmp_hwif->hold;
+
+#ifdef CONFIG_BLK_DEV_IDEPCI
+	hwif->pci_dev			= tmp_hwif->pci_dev;
+	hwif->cds			= tmp_hwif->cds;
+#endif
+
+	hwif->tuneproc			= tmp_hwif->tuneproc;
+	hwif->speedproc			= tmp_hwif->speedproc;
+	hwif->selectproc		= tmp_hwif->selectproc;
+	hwif->reset_poll		= tmp_hwif->reset_poll;
+	hwif->pre_reset			= tmp_hwif->pre_reset;
+	hwif->resetproc			= tmp_hwif->resetproc;
+	hwif->intrproc			= tmp_hwif->intrproc;
+	hwif->maskproc			= tmp_hwif->maskproc;
+	hwif->quirkproc			= tmp_hwif->quirkproc;
+	hwif->busproc			= tmp_hwif->busproc;
+
+	hwif->ata_input_data		= tmp_hwif->ata_input_data;
+	hwif->ata_output_data		= tmp_hwif->ata_output_data;
+	hwif->atapi_input_bytes		= tmp_hwif->atapi_input_bytes;
+	hwif->atapi_output_bytes	= tmp_hwif->atapi_output_bytes;
+
+	hwif->dma_setup			= tmp_hwif->dma_setup;
+	hwif->dma_exec_cmd		= tmp_hwif->dma_exec_cmd;
+	hwif->dma_start			= tmp_hwif->dma_start;
+	hwif->ide_dma_end		= tmp_hwif->ide_dma_end;
+	hwif->ide_dma_check		= tmp_hwif->ide_dma_check;
+	hwif->ide_dma_on		= tmp_hwif->ide_dma_on;
+	hwif->ide_dma_off_quietly	= tmp_hwif->ide_dma_off_quietly;
+	hwif->ide_dma_test_irq		= tmp_hwif->ide_dma_test_irq;
+	hwif->ide_dma_host_on		= tmp_hwif->ide_dma_host_on;
+	hwif->ide_dma_host_off		= tmp_hwif->ide_dma_host_off;
+	hwif->ide_dma_lostirq		= tmp_hwif->ide_dma_lostirq;
+	hwif->ide_dma_timeout		= tmp_hwif->ide_dma_timeout;
+
+	hwif->OUTB			= tmp_hwif->OUTB;
+	hwif->OUTBSYNC			= tmp_hwif->OUTBSYNC;
+	hwif->OUTW			= tmp_hwif->OUTW;
+	hwif->OUTL			= tmp_hwif->OUTL;
+	hwif->OUTSW			= tmp_hwif->OUTSW;
+	hwif->OUTSL			= tmp_hwif->OUTSL;
+
+	hwif->INB			= tmp_hwif->INB;
+	hwif->INW			= tmp_hwif->INW;
+	hwif->INL			= tmp_hwif->INL;
+	hwif->INSW			= tmp_hwif->INSW;
+	hwif->INSL			= tmp_hwif->INSL;
+
+	hwif->sg_max_nents		= tmp_hwif->sg_max_nents;
+
+	hwif->mmio			= tmp_hwif->mmio;
+	hwif->rqsize			= tmp_hwif->rqsize;
+	hwif->no_lba48			= tmp_hwif->no_lba48;
+
+#ifndef CONFIG_BLK_DEV_IDECS
+	hwif->irq			= tmp_hwif->irq;
+#endif
+
+	hwif->dma_base			= tmp_hwif->dma_base;
+	hwif->dma_master		= tmp_hwif->dma_master;
+	hwif->dma_command		= tmp_hwif->dma_command;
+	hwif->dma_vendor1		= tmp_hwif->dma_vendor1;
+	hwif->dma_status		= tmp_hwif->dma_status;
+	hwif->dma_vendor3		= tmp_hwif->dma_vendor3;
+	hwif->dma_prdtable		= tmp_hwif->dma_prdtable;
+
+	hwif->dma_extra			= tmp_hwif->dma_extra;
+	hwif->config_data		= tmp_hwif->config_data;
+	hwif->select_data		= tmp_hwif->select_data;
+	hwif->autodma			= tmp_hwif->autodma;
+	hwif->udma_four			= tmp_hwif->udma_four;
+	hwif->no_dsc			= tmp_hwif->no_dsc;
+
+	hwif->hwif_data			= tmp_hwif->hwif_data;
+}
+
+/**
+ *	ide_unregister		-	free an ide interface
+ *	@index: index of interface (will change soon to a pointer)
+ *
+ *	Perform the final unregister of an IDE interface. At the moment
+ *	we don't refcount interfaces so this will also get split up.
+ *
+ *	Locking:
+ *	The caller must not hold the IDE locks
+ *	The drive present/vanishing is not yet properly locked
+ *	Take care with the callbacks. These have been split to avoid
+ *	deadlocking the IDE layer. The shutdown callback is called
+ *	before we take the lock and free resources. It is up to the
+ *	caller to be sure there is no pending I/O here, and that
+ *	the interfce will not be reopened (present/vanishing locking
+ *	isnt yet done btw). After we commit to the final kill we
+ *	call the cleanup callback with the ide locks held.
+ *
+ *	Unregister restores the hwif structures to the default state.
+ *	This is raving bonkers.
+ */
+
+void ide_unregister(unsigned int index)
+{
+	ide_drive_t *drive;
+	ide_hwif_t *hwif, *g;
+	static ide_hwif_t tmp_hwif; /* protected by ide_cfg_sem */
+	ide_hwgroup_t *hwgroup;
+	int irq_count = 0, unit, i;
+
+	BUG_ON(index >= MAX_HWIFS);
+
+	BUG_ON(in_interrupt());
+	BUG_ON(irqs_disabled());
+	down(&ide_cfg_sem);
+	spin_lock_irq(&ide_lock);
+	hwif = &ide_hwifs[index];
+	if (!hwif->present)
+		goto abort;
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		drive = &hwif->drives[unit];
+		if (!drive->present)
+			continue;
+		if (drive->usage || DRIVER(drive)->busy)
+			goto abort;
+		drive->dead = 1;
+	}
+	hwif->present = 0;
+
+	spin_unlock_irq(&ide_lock);
+
+	for (unit = 0; unit < MAX_DRIVES; ++unit) {
+		drive = &hwif->drives[unit];
+		if (!drive->present)
+			continue;
+		DRIVER(drive)->cleanup(drive);
+	}
+
+	destroy_proc_ide_interface(hwif);
+
+	hwgroup = hwif->hwgroup;
+	/*
+	 * free the irq if we were the only hwif using it
+	 */
+	g = hwgroup->hwif;
+	do {
+		if (g->irq == hwif->irq)
+			++irq_count;
+		g = g->next;
+	} while (g != hwgroup->hwif);
+	if (irq_count == 1)
+		free_irq(hwif->irq, hwgroup);
+
+	spin_lock_irq(&ide_lock);
+	/*
+	 * Note that we only release the standard ports,
+	 * and do not even try to handle any extra ports
+	 * allocated for weird IDE interface chipsets.
+	 */
+	ide_hwif_release_regions(hwif);
+
+	/*
+	 * Remove us from the hwgroup, and free
+	 * the hwgroup if we were the only member
+	 */
+	for (i = 0; i < MAX_DRIVES; ++i) {
+		drive = &hwif->drives[i];
+		if (drive->devfs_name[0] != '\0') {
+			devfs_remove(drive->devfs_name);
+			drive->devfs_name[0] = '\0';
+		}
+		if (!drive->present)
+			continue;
+		if (drive == drive->next) {
+			/* special case: last drive from hwgroup. */
+			BUG_ON(hwgroup->drive != drive);
+			hwgroup->drive = NULL;
+		} else {
+			ide_drive_t *walk;
+
+			walk = hwgroup->drive;
+			while (walk->next != drive)
+				walk = walk->next;
+			walk->next = drive->next;
+			if (hwgroup->drive == drive) {
+				hwgroup->drive = drive->next;
+				hwgroup->hwif = HWIF(hwgroup->drive);
+			}
+		}
+		BUG_ON(hwgroup->drive == drive);
+		if (drive->id != NULL) {
+			kfree(drive->id);
+			drive->id = NULL;
+		}
+		drive->present = 0;
+		/* Messed up locking ... */
+		spin_unlock_irq(&ide_lock);
+		blk_cleanup_queue(drive->queue);
+		device_unregister(&drive->gendev);
+		down(&drive->gendev_rel_sem);
+		spin_lock_irq(&ide_lock);
+		drive->queue = NULL;
+	}
+	if (hwif->next == hwif) {
+		BUG_ON(hwgroup->hwif != hwif);
+		kfree(hwgroup);
+	} else {
+		/* There is another interface in hwgroup.
+		 * Unlink us, and set hwgroup->drive and ->hwif to
+		 * something sane.
+		 */
+		g = hwgroup->hwif;
+		while (g->next != hwif)
+			g = g->next;
+		g->next = hwif->next;
+		if (hwgroup->hwif == hwif) {
+			/* Chose a random hwif for hwgroup->hwif.
+			 * It's guaranteed that there are no drives
+			 * left in the hwgroup.
+			 */
+			BUG_ON(hwgroup->drive != NULL);
+			hwgroup->hwif = g;
+		}
+		BUG_ON(hwgroup->hwif == hwif);
+	}
+
+	/* More messed up locking ... */
+	spin_unlock_irq(&ide_lock);
+	device_unregister(&hwif->gendev);
+	down(&hwif->gendev_rel_sem);
+
+	/*
+	 * 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);
+	spin_lock_irq(&ide_lock);
+
+	if (hwif->dma_base) {
+		(void) ide_release_dma(hwif);
+
+		hwif->dma_base = 0;
+		hwif->dma_master = 0;
+		hwif->dma_command = 0;
+		hwif->dma_vendor1 = 0;
+		hwif->dma_status = 0;
+		hwif->dma_vendor3 = 0;
+		hwif->dma_prdtable = 0;
+	}
+
+	/* copy original settings */
+	tmp_hwif = *hwif;
+
+	/* restore hwif data to pristine status */
+	init_hwif_data(hwif, index);
+	init_hwif_default(hwif, index);
+
+	ide_hwif_restore(hwif, &tmp_hwif);
+
+abort:
+	spin_unlock_irq(&ide_lock);
+	up(&ide_cfg_sem);
+}
+
+EXPORT_SYMBOL(ide_unregister);
+
+
+/**
+ *	ide_setup_ports 	-	set up IDE interface ports
+ *	@hw: register descriptions
+ *	@base: base register
+ *	@offsets: table of register offsets
+ *	@ctrl: control register
+ *	@ack_irq: IRQ ack
+ *	@irq: interrupt lie
+ *
+ *	Setup hw_regs_t structure described by parameters.  You
+ *	may set up the hw structure yourself OR use this routine to
+ *	do it for you. This is basically a helper
+ *
+ */
+ 
+void ide_setup_ports (	hw_regs_t *hw,
+			unsigned long base, int *offsets,
+			unsigned long ctrl, unsigned long intr,
+			ide_ack_intr_t *ack_intr,
+/*
+ *			ide_io_ops_t *iops,
+ */
+			int irq)
+{
+	int i;
+
+	for (i = 0; i < IDE_NR_PORTS; i++) {
+		if (offsets[i] == -1) {
+			switch(i) {
+				case IDE_CONTROL_OFFSET:
+					hw->io_ports[i] = ctrl;
+					break;
+#if defined(CONFIG_AMIGA) || defined(CONFIG_MAC)
+				case IDE_IRQ_OFFSET:
+					hw->io_ports[i] = intr;
+					break;
+#endif /* (CONFIG_AMIGA) || (CONFIG_MAC) */
+				default:
+					hw->io_ports[i] = 0;
+					break;
+			}
+		} else {
+			hw->io_ports[i] = base + offsets[i];
+		}
+	}
+	hw->irq = irq;
+	hw->dma = NO_DMA;
+	hw->ack_intr = ack_intr;
+/*
+ *	hw->iops = iops;
+ */
+}
+
+/**
+ *	ide_register_hw_with_fixup	-	register IDE interface
+ *	@hw: hardware registers
+ *	@hwifp: pointer to returned hwif
+ *	@fixup: fixup function
+ *
+ *	Register an IDE interface, specifying exactly the registers etc.
+ *	Set init=1 iff calling before probes have taken place.
+ *
+ *	Returns -1 on error.
+ */
+
+int ide_register_hw_with_fixup(hw_regs_t *hw, ide_hwif_t **hwifp, void(*fixup)(ide_hwif_t *hwif))
+{
+	int index, retry = 1;
+	ide_hwif_t *hwif;
+
+	do {
+		for (index = 0; index < MAX_HWIFS; ++index) {
+			hwif = &ide_hwifs[index];
+			if (hwif->hw.io_ports[IDE_DATA_OFFSET] == hw->io_ports[IDE_DATA_OFFSET])
+				goto found;
+		}
+		for (index = 0; index < MAX_HWIFS; ++index) {
+			hwif = &ide_hwifs[index];
+			if (hwif->hold)
+				continue;
+			if ((!hwif->present && !hwif->mate && !initializing) ||
+			    (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
+				goto found;
+		}
+		for (index = 0; index < MAX_HWIFS; index++)
+			ide_unregister(index);
+	} while (retry--);
+	return -1;
+found:
+	if (hwif->present)
+		ide_unregister(index);
+	else if (!hwif->hold) {
+		init_hwif_data(hwif, index);
+		init_hwif_default(hwif, index);
+	}
+	if (hwif->present)
+		return -1;
+	memcpy(&hwif->hw, hw, sizeof(*hw));
+	memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->hw.io_ports));
+	hwif->irq = hw->irq;
+	hwif->noprobe = 0;
+	hwif->chipset = hw->chipset;
+
+	if (!initializing) {
+		probe_hwif_init_with_fixup(hwif, fixup);
+		create_proc_ide_interfaces();
+	}
+
+	if (hwifp)
+		*hwifp = hwif;
+
+	return (initializing || hwif->present) ? index : -1;
+}
+
+EXPORT_SYMBOL(ide_register_hw_with_fixup);
+
+int ide_register_hw(hw_regs_t *hw, ide_hwif_t **hwifp)
+{
+	return ide_register_hw_with_fixup(hw, hwifp, NULL);
+}
+
+EXPORT_SYMBOL(ide_register_hw);
+
+/*
+ *	Locks for IDE setting functionality
+ */
+
+DECLARE_MUTEX(ide_setting_sem);
+
+/**
+ *	__ide_add_setting	-	add an ide setting option
+ *	@drive: drive to use
+ *	@name: setting name
+ *	@rw: true if the function is read write
+ *	@read_ioctl: function to call on read
+ *	@write_ioctl: function to call on write
+ *	@data_type: type of data
+ *	@min: range minimum
+ *	@max: range maximum
+ *	@mul_factor: multiplication scale
+ *	@div_factor: divison scale
+ *	@data: private data field
+ *	@set: setting
+ *	@auto_remove: setting auto removal flag
+ *
+ *	Removes the setting named from the device if it is present.
+ *	The function takes the settings_lock to protect against 
+ *	parallel changes. This function must not be called from IRQ
+ *	context. Returns 0 on success or -1 on failure.
+ *
+ *	BUGS: This code is seriously over-engineered. There is also
+ *	magic about how the driver specific features are setup. If
+ *	a driver is attached we assume the driver settings are auto
+ *	remove.
+ */
+
+static int __ide_add_setting(ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set, int auto_remove)
+{
+	ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL;
+
+	down(&ide_setting_sem);
+	while ((*p) && strcmp((*p)->name, name) < 0)
+		p = &((*p)->next);
+	if ((setting = kmalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
+		goto abort;
+	memset(setting, 0, sizeof(*setting));
+	if ((setting->name = kmalloc(strlen(name) + 1, GFP_KERNEL)) == NULL)
+		goto abort;
+	strcpy(setting->name, name);
+	setting->rw = rw;
+	setting->read_ioctl = read_ioctl;
+	setting->write_ioctl = write_ioctl;
+	setting->data_type = data_type;
+	setting->min = min;
+	setting->max = max;
+	setting->mul_factor = mul_factor;
+	setting->div_factor = div_factor;
+	setting->data = data;
+	setting->set = set;
+	
+	setting->next = *p;
+	if (auto_remove)
+		setting->auto_remove = 1;
+	*p = setting;
+	up(&ide_setting_sem);
+	return 0;
+abort:
+	up(&ide_setting_sem);
+	if (setting)
+		kfree(setting);
+	return -1;
+}
+
+int ide_add_setting(ide_drive_t *drive, const char *name, int rw, int read_ioctl, int write_ioctl, int data_type, int min, int max, int mul_factor, int div_factor, void *data, ide_procset_t *set)
+{
+	return __ide_add_setting(drive, name, rw, read_ioctl, write_ioctl, data_type, min, max, mul_factor, div_factor, data, set, 1);
+}
+
+EXPORT_SYMBOL(ide_add_setting);
+
+/**
+ *	__ide_remove_setting	-	remove an ide setting option
+ *	@drive: drive to use
+ *	@name: setting name
+ *
+ *	Removes the setting named from the device if it is present.
+ *	The caller must hold the setting semaphore.
+ */
+ 
+static void __ide_remove_setting (ide_drive_t *drive, char *name)
+{
+	ide_settings_t **p, *setting;
+
+	p = (ide_settings_t **) &drive->settings;
+
+	while ((*p) && strcmp((*p)->name, name))
+		p = &((*p)->next);
+	if ((setting = (*p)) == NULL)
+		return;
+
+	(*p) = setting->next;
+	
+	kfree(setting->name);
+	kfree(setting);
+}
+
+/**
+ *	ide_find_setting_by_ioctl	-	find a drive specific ioctl
+ *	@drive: drive to scan
+ *	@cmd: ioctl command to handle
+ *
+ *	Scan's the device setting table for a matching entry and returns
+ *	this or NULL if no entry is found. The caller must hold the
+ *	setting semaphore
+ */
+ 
+static ide_settings_t *ide_find_setting_by_ioctl (ide_drive_t *drive, int cmd)
+{
+	ide_settings_t *setting = drive->settings;
+
+	while (setting) {
+		if (setting->read_ioctl == cmd || setting->write_ioctl == cmd)
+			break;
+		setting = setting->next;
+	}
+	
+	return setting;
+}
+
+/**
+ *	ide_find_setting_by_name	-	find a drive specific setting
+ *	@drive: drive to scan
+ *	@name: setting name
+ *
+ *	Scan's the device setting table for a matching entry and returns
+ *	this or NULL if no entry is found. The caller must hold the
+ *	setting semaphore
+ */
+ 
+ide_settings_t *ide_find_setting_by_name (ide_drive_t *drive, char *name)
+{
+	ide_settings_t *setting = drive->settings;
+
+	while (setting) {
+		if (strcmp(setting->name, name) == 0)
+			break;
+		setting = setting->next;
+	}
+	return setting;
+}
+
+/**
+ *	auto_remove_settings	-	remove driver specific settings
+ *	@drive: drive
+ *
+ *	Automatically remove all the driver specific settings for this
+ *	drive. This function may sleep and must not be called from IRQ
+ *	context. The caller must hold ide_setting_sem.
+ */
+ 
+static void auto_remove_settings (ide_drive_t *drive)
+{
+	ide_settings_t *setting;
+repeat:
+	setting = drive->settings;
+	while (setting) {
+		if (setting->auto_remove) {
+			__ide_remove_setting(drive, setting->name);
+			goto repeat;
+		}
+		setting = setting->next;
+	}
+}
+
+/**
+ *	ide_read_setting	-	read an IDE setting
+ *	@drive: drive to read from
+ *	@setting: drive setting
+ *
+ *	Read a drive setting and return the value. The caller
+ *	must hold the ide_setting_sem when making this call.
+ *
+ *	BUGS: the data return and error are the same return value
+ *	so an error -EINVAL and true return of the same value cannot
+ *	be told apart
+ */
+ 
+int ide_read_setting (ide_drive_t *drive, ide_settings_t *setting)
+{
+	int		val = -EINVAL;
+	unsigned long	flags;
+
+	if ((setting->rw & SETTING_READ)) {
+		spin_lock_irqsave(&ide_lock, flags);
+		switch(setting->data_type) {
+			case TYPE_BYTE:
+