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ide.c

/*
 *  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/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/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);

/*
 * 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 */

      init_completion(&hwif->gendev_rel_comp);

      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->vdma             = 0;
            INIT_LIST_HEAD(&drive->list);
            init_completion(&drive->gendev_rel_comp);
      }
}

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;
}

#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;

      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;
            spin_unlock_irq(&ide_lock);
            device_unregister(&drive->gendev);
            wait_for_completion(&drive->gendev_rel_comp);
            spin_lock_irq(&ide_lock);
      }
      hwif->present = 0;

      spin_unlock_irq(&ide_lock);

      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
       */
      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);
      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);
      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;

      memset(hw, 0, sizeof(hw_regs_t));
      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;
      hwif->gendev.parent = hw->dev;

      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 = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL)
            goto abort;
      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);
      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:
                        val = *((u8 *) setting->data);
                        break;
                  case TYPE_SHORT:
                        val = *((u16 *) setting->data);
                        break;
                  case TYPE_INT:
                  case TYPE_INTA:
                        val = *((u32 *) setting->data);
                        break;
            }
            spin_unlock_irqrestore(&ide_lock, flags);
      }
      return val;
}

/**
 *    ide_spin_wait_hwgroup   -     wait for group
 *    @drive: drive in the group
 *
 *    Wait for an IDE device group to go non busy and then return
 *    holding the ide_lock which guards the hwgroup->busy status
 *    and right to use it.
 */

int ide_spin_wait_hwgroup (ide_drive_t *drive)
{
      ide_hwgroup_t *hwgroup = HWGROUP(drive);
      unsigned long timeout = jiffies + (3 * HZ);

      spin_lock_irq(&ide_lock);

      while (hwgroup->busy) {
            unsigned long lflags;
            spin_unlock_irq(&ide_lock);
            local_irq_set(lflags);
            if (time_after(jiffies, timeout)) {
                  local_irq_restore(lflags);
                  printk(KERN_ERR "%s: channel busy\n", drive->name);
                  return -EBUSY;
            }
            local_irq_restore(lflags);
            spin_lock_irq(&ide_lock);
      }
      return 0;
}

EXPORT_SYMBOL(ide_spin_wait_hwgroup);

/**
 *    ide_write_setting -     read an IDE setting
 *    @drive: drive to read from
 *    @setting: drive setting
 *    @val: value
 *
 *    Write a drive setting if it is possible. 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
 *
 *    FIXME:  This should be changed to enqueue a special request
 *    to the driver to change settings, and then wait on a sema for completion.
 *    The current scheme of polling is kludgy, though safe enough.
 */

int ide_write_setting (ide_drive_t *drive, ide_settings_t *setting, int val)
{
      int i;
      u32 *p;

      if (!capable(CAP_SYS_ADMIN))
            return -EACCES;
      if (!(setting->rw & SETTING_WRITE))
            return -EPERM;
      if (val < setting->min || val > setting->max)
            return -EINVAL;
      if (setting->set)
            return setting->set(drive, val);
      if (ide_spin_wait_hwgroup(drive))
            return -EBUSY;
      switch (setting->data_type) {
            case TYPE_BYTE:
                  *((u8 *) setting->data) = val;
                  break;
            case TYPE_SHORT:
                  *((u16 *) setting->data) = val;
                  break;
            case TYPE_INT:
                  *((u32 *) setting->data) = val;
                  break;
            case TYPE_INTA:
                  p = (u32 *) setting->data;
                  for (i = 0; i < 1 << PARTN_BITS; i++, p++)
                        *p = val;
                  break;
      }
      spin_unlock_irq(&ide_lock);
      return 0;
}

static int set_io_32bit(ide_drive_t *drive, int arg)
{
      drive->io_32bit = arg;
#ifdef CONFIG_BLK_DEV_DTC2278
      if (HWIF(drive)->chipset == ide_dtc2278)
            HWIF(drive)->drives[!drive->select.b.unit].io_32bit = arg;
#endif /* CONFIG_BLK_DEV_DTC2278 */
      return 0;
}

static int set_using_dma (ide_drive_t *drive, int arg)
{
#ifdef CONFIG_BLK_DEV_IDEDMA
      if (!drive->id || !(drive->id->capability & 1))
            return -EPERM;
      if (HWIF(drive)->ide_dma_check == NULL)
            return -EPERM;
      if (arg) {
            if (HWIF(drive)->ide_dma_check(drive)) return -EIO;
            if (HWIF(drive)->ide_dma_on(drive)) return -EIO;
      } else {
            if (__ide_dma_off(drive))
                  return -EIO;
      }
      return 0;
#else
      return -EPERM;
#endif
}

static int set_pio_mode (ide_drive_t *drive, int arg)
{
      struct request rq;

      if (!HWIF(drive)->tuneproc)
            return -ENOSYS;
      if (drive->special.b.set_tune)
            return -EBUSY;
      ide_init_drive_cmd(&rq);
      drive->tune_req = (u8) arg;
      drive->special.b.set_tune = 1;
      (void) ide_do_drive_cmd(drive, &rq, ide_wait);
      return 0;
}

static int set_xfer_rate (ide_drive_t *drive, int arg)
{
      int err = ide_wait_cmd(drive,
                  WIN_SETFEATURES, (u8) arg,
                  SETFEATURES_XFER, 0, NULL);

      if (!err && arg) {
            ide_set_xfer_rate(drive, (u8) arg);
            ide_driveid_update(drive);
      }
      return err;
}

/**
 *    ide_add_generic_settings      -     generic ide settings
 *    @drive: drive being configured
 *
 *    Add the generic parts of the system settings to the /proc files and
 *    ioctls for this IDE device. The caller must not be holding the
 *    ide_setting_sem.
 */

void ide_add_generic_settings (ide_drive_t *drive)
{
/*
 *                  drive           setting name            read/write access                   read ioctl        write ioctl       data type   min   max                     mul_factor  div_factor  data pointer                  set function
 */
      __ide_add_setting(drive,      "io_32bit",       drive->no_io_32bit ? SETTING_READ : SETTING_RW, HDIO_GET_32BIT,         HDIO_SET_32BIT,         TYPE_BYTE,  0,    1 + (SUPPORT_VLB_SYNC << 1),  1,          1,          &drive->io_32bit,       set_io_32bit,     0);
      __ide_add_setting(drive,      "keepsettings",         SETTING_RW,                         HDIO_GET_KEEPSETTINGS,  HDIO_SET_KEEPSETTINGS,  TYPE_BYTE,  0,    1,                      1,          1,          &drive->keep_settings,        NULL,       0);
      __ide_add_setting(drive,      "nice1",          SETTING_RW,                         -1,               -1,               TYPE_BYTE,  0,    1,                      1,          1,          &drive->nice1,                NULL,       0);
      __ide_add_setting(drive,      "pio_mode",       SETTING_WRITE,                            -1,               HDIO_SET_PIO_MODE,      TYPE_BYTE,  0,    255,                    1,          1,          NULL,                   set_pio_mode,     0);
      __ide_add_setting(drive,      "unmaskirq",            drive->no_unmask ? SETTING_READ : SETTING_RW,   HDIO_GET_UNMASKINTR,    HDIO_SET_UNMASKINTR,    TYPE_BYTE,  0,    1,                      1,          1,          &drive->unmask,               NULL,       0);
      __ide_add_setting(drive,      "using_dma",            SETTING_RW,                         HDIO_GET_DMA,           HDIO_SET_DMA,           TYPE_BYTE,  0,    1,                      1,          1,          &drive->using_dma,            set_using_dma,    0);
      __ide_add_setting(drive,      "init_speed",           SETTING_RW,                         -1,               -1,               TYPE_BYTE,  0,    70,                     1,          1,          &drive->init_speed,           NULL,       0);
      __ide_add_setting(drive,      "current_speed",  SETTING_RW,                         -1,               -1,               TYPE_BYTE,  0,    70,                     1,          1,          &drive->current_speed,        set_xfer_rate,    0);
      __ide_add_setting(drive,      "number",         SETTING_RW,                         -1,               -1,               TYPE_BYTE,  0,    3,                      1,          1,          &drive->dn,             NULL,       0);
}

/**
 *    system_bus_clock  -     clock guess
 *
 *    External version of the bus clock guess used by very old IDE drivers
 *    for things like VLB timings. Should not be used.
 */

int system_bus_clock (void)
{
      return((int) ((!system_bus_speed) ? ide_system_bus_speed() : system_bus_speed ));
}

EXPORT_SYMBOL(system_bus_clock);

static int generic_ide_suspend(struct device *dev, pm_message_t state)
{
      ide_drive_t *drive = dev->driver_data;
      struct request rq;
      struct request_pm_state rqpm;
      ide_task_t args;

      memset(&rq, 0, sizeof(rq));
      memset(&rqpm, 0, sizeof(rqpm));
      memset(&args, 0, sizeof(args));
      rq.flags = REQ_PM_SUSPEND;
      rq.special = &args;
      rq.end_io_data = &rqpm;
      rqpm.pm_step = ide_pm_state_start_suspend;
      rqpm.pm_state = state.event;

      return ide_do_drive_cmd(drive, &rq, ide_wait);
}

static int generic_ide_resume(struct device *dev)
{
      ide_drive_t *drive = dev->driver_data;
      struct request rq;
      struct request_pm_state rqpm;
      ide_task_t args;

      memset(&rq, 0, sizeof(rq));
      memset(&rqpm, 0, sizeof(rqpm));
      memset(&args, 0, sizeof(args));
      rq.flags = REQ_PM_RESUME;
      rq.special = &args;
      rq.end_io_data = &rqpm;
      rqpm.pm_step = ide_pm_state_start_resume;
      rqpm.pm_state = PM_EVENT_ON;

      return ide_do_drive_cmd(drive, &rq, ide_head_wait);
}

int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
                  unsigned int cmd, unsigned long arg)
{
      ide_settings_t *setting;
      ide_driver_t *drv;
      int err = 0;
      void __user *p = (void __user *)arg;

      down(&ide_setting_sem);
      if ((setting = ide_find_setting_by_ioctl(drive, cmd)) != NULL) {
            if (cmd == setting->read_ioctl) {
                  err = ide_read_setting(drive, setting);
                  up(&ide_setting_sem);
                  return err >= 0 ? put_user(err, (long __user *)arg) : err;
            } else {
                  if (bdev != bdev->bd_contains)
                        err = -EINVAL;
                  else
                        err = ide_write_setting(drive, setting, arg);
                  up(&ide_setting_sem);
                  return err;
            }
      }
      up(&ide_setting_sem);

      switch (cmd) {
            case HDIO_OBSOLETE_IDENTITY:
            case HDIO_GET_IDENTITY:
                  if (bdev != bdev->bd_contains)
                        return -EINVAL;
                  if (drive->id_read == 0)
                        return -ENOMSG;
                  if (copy_to_user(p, drive->id, (cmd == HDIO_GET_IDENTITY) ? sizeof(*drive->id) : 142))
                        return -EFAULT;
                  return 0;

            case HDIO_GET_NICE:
                  return put_user(drive->dsc_overlap  <<    IDE_NICE_DSC_OVERLAP    |
                              drive->atapi_overlap    <<    IDE_NICE_ATAPI_OVERLAP  |
                              drive->nice0            <<    IDE_NICE_0        |
                              drive->nice1            <<    IDE_NICE_1        |
                              drive->nice2            <<    IDE_NICE_2,
                              (long __user *) arg);

#ifdef CONFIG_IDE_TASK_IOCTL
            case HDIO_DRIVE_TASKFILE:
                    if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
                        return -EACCES;
                  switch(drive->media) {
                        case ide_disk:
                              return ide_taskfile_ioctl(drive, cmd, arg);
                        default:
                              return -ENOMSG;
                  }
#endif /* CONFIG_IDE_TASK_IOCTL */

            case HDIO_DRIVE_CMD:
                  if (!capable(CAP_SYS_RAWIO))
                        return -EACCES;
                  return ide_cmd_ioctl(drive, cmd, arg);

            case HDIO_DRIVE_TASK:
                  if (!capable(CAP_SYS_RAWIO))
                        return -EACCES;
                  return ide_task_ioctl(drive, cmd, arg);

            case HDIO_SCAN_HWIF:
            {
                  hw_regs_t hw;
                  int args[3];
                  if (!capable(CAP_SYS_RAWIO)) return -EACCES;
                  if (copy_from_user(args, p, 3 * sizeof(int)))
                        return -EFAULT;
                  memset(&hw, 0, sizeof(hw));
                  ide_init_hwif_ports(&hw, (unsigned long) args[0],
                                  (unsigned long) args[1], NULL);
                  hw.irq = args[2];
                  if (ide_register_hw(&hw, NULL) == -1)
                        return -EIO;
                  return 0;
            }
              case HDIO_UNREGISTER_HWIF:
                  if (!capable(CAP_SYS_RAWIO)) return -EACCES;
                  /* (arg > MAX_HWIFS) checked in function */
                  ide_unregister(arg);
                  return 0;
            case HDIO_SET_NICE:
                  if (!capable(CAP_SYS_ADMIN)) return -EACCES;
                  if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
                        return -EPERM;
                  drive->dsc_overlap = (arg >> IDE_NICE_DSC_OVERLAP) & 1;
                  drv = *(ide_driver_t **)bdev->bd_disk->private_data;
                  if (drive->dsc_overlap && !drv->supports_dsc_overlap) {
                        drive->dsc_overlap = 0;
                        return -EPERM;
                  }
                  drive->nice1 = (arg >> IDE_NICE_1) & 1;
                  return 0;
            case HDIO_DRIVE_RESET:
            {
                  unsigned long flags;
                  if (!capable(CAP_SYS_ADMIN)) return -EACCES;
                  
                  /*
                   *    Abort the current command on the
                   *    group if there is one, taking
                   *    care not to allow anything else
                   *    to be queued and to die on the
                   *    spot if we miss one somehow
                   */

                  spin_lock_irqsave(&ide_lock, flags);

                  ide_abort(drive, "drive reset");

                  BUG_ON(HWGROUP(drive)->handler);
                        
                  /* Ensure nothing gets queued after we
                     drop the lock. Reset will clear the busy */
               
                  HWGROUP(drive)->busy = 1;
                  spin_unlock_irqrestore(&ide_lock, flags);
                  (void) ide_do_reset(drive);

                  return 0;
            }

            case CDROMEJECT:
            case CDROMCLOSETRAY:
                  return scsi_cmd_ioctl(file, bdev->bd_disk, cmd, p);

            case HDIO_GET_BUSSTATE:
                  if (!capable(CAP_SYS_ADMIN))
                        return -EACCES;
                  if (put_user(HWIF(drive)->bus_state, (long __user *)arg))
                        return -EFAULT;
                  return 0;

            case HDIO_SET_BUSSTATE:
                  if (!capable(CAP_SYS_ADMIN))
                        return -EACCES;
                  if (HWIF(drive)->busproc)
                        return HWIF(drive)->busproc(drive, (int)arg);
                  return -EOPNOTSUPP;
            default:
                  return -EINVAL;
      }
}

EXPORT_SYMBOL(generic_ide_ioctl);

/*
 * stridx() returns the offset of c within s,
 * or -1 if c is '\0' or not found within s.
 */
static int __init stridx (const char *s, char c)
{
      char *i = strchr(s, c);
      return (i && c) ? i - s : -1;
}

/*
 * match_parm() does parsing for ide_setup():
 *
 * 1. the first char of s must be '='.
 * 2. if the remainder matches one of the supplied keywords,
 *     the index (1 based) of the keyword is negated and returned.
 * 3. if the remainder is a series of no more than max_vals numbers
 *     separated by commas, the numbers are saved in vals[] and a
 *     count of how many were saved is returned.  Base10 is assumed,
 *     and base16 is allowed when prefixed with "0x".
 * 4. otherwise, zero is returned.
 */
static int __init match_parm (char *s, const char *keywords[], int vals[], int max_vals)
{
      static const char *decimal = "0123456789";
      static const char *hex = "0123456789abcdef";
      int i, n;

      if (*s++ == '=') {
            /*
             * Try matching against the supplied keywords,
             * and return -(index+1) if we match one
             */
            if (keywords != NULL) {
                  for (i = 0; *keywords != NULL; ++i) {
                        if (!strcmp(s, *keywords++))
                              return -(i+1);
                  }
            }
            /*
             * Look for a series of no more than "max_vals"
             * numeric values separated by commas, in base10,
             * or base16 when prefixed with "0x".
             * Return a count of how many were found.
             */
            for (n = 0; (i = stridx(decimal, *s)) >= 0;) {
                  vals[n] = i;
                  while ((i = stridx(decimal, *++s)) >= 0)
                        vals[n] = (vals[n] * 10) + i;
                  if (*s == 'x' && !vals[n]) {
                        while ((i = stridx(hex, *++s)) >= 0)
                              vals[n] = (vals[n] * 0x10) + i;
                  }
                  if (++n == max_vals)
                        break;
                  if (*s == ',' || *s == ';')
                        ++s;
            }
            if (!*s)
                  return n;
      }
      return 0;   /* zero = nothing matched */
}

#ifdef CONFIG_BLK_DEV_ALI14XX
static int __initdata probe_ali14xx;
extern int ali14xx_init(void);
#endif
#ifdef CONFIG_BLK_DEV_UMC8672
static int __initdata probe_umc8672;
extern int umc8672_init(void);
#endif
#ifdef CONFIG_BLK_DEV_DTC2278
static int __initdata probe_dtc2278;
extern int dtc2278_init(void);
#endif
#ifdef CONFIG_BLK_DEV_HT6560B
static int __initdata probe_ht6560b;
extern int ht6560b_init(void);
#endif
#ifdef CONFIG_BLK_DEV_QD65XX
static int __initdata probe_qd65xx;
extern int qd65xx_init(void);
#endif

static int __initdata is_chipset_set[MAX_HWIFS];

/*
 * ide_setup() gets called VERY EARLY during initialization,
 * to handle kernel "command line" strings beginning with "hdx=" or "ide".
 *
 * Remember to update Documentation/ide.txt if you change something here.
 */
static int __init ide_setup(char *s)
{
      int i, vals[3];
      ide_hwif_t *hwif;
      ide_drive_t *drive;
      unsigned int hw, unit;
      const char max_drive = 'a' + ((MAX_HWIFS * MAX_DRIVES) - 1);
      const char max_hwif  = '0' + (MAX_HWIFS - 1);

      
      if (strncmp(s,"hd",2) == 0 && s[2] == '=')      /* hd= is for hd.c   */
            return 0;                     /* driver and not us */

      if (strncmp(s,"ide",3) && strncmp(s,"idebus",6) && strncmp(s,"hd",2))
            return 0;

      printk(KERN_INFO "ide_setup: %s", s);
      init_ide_data ();

#ifdef CONFIG_BLK_DEV_IDEDOUBLER
      if (!strcmp(s, "ide=doubler")) {
            extern int ide_doubler;

            printk(" : Enabled support for IDE doublers\n");
            ide_doubler = 1;
            return 1;
      }
#endif /* CONFIG_BLK_DEV_IDEDOUBLER */

      if (!strcmp(s, "ide=nodma")) {
            printk(" : Prevented DMA\n");
            noautodma = 1;
            return 1;
      }

#ifdef CONFIG_BLK_DEV_IDEPCI
      if (!strcmp(s, "ide=reverse")) {
            ide_scan_direction = 1;
            printk(" : Enabled support for IDE inverse scan order.\n");
            return 1;
      }
#endif /* CONFIG_BLK_DEV_IDEPCI */

      /*
       * Look for drive options:  "hdx="
       */
      if (s[0] == 'h' && s[1] == 'd' && s[2] >= 'a' && s[2] <= max_drive) {
            const char *hd_words[] = {
                  "none", "noprobe", "nowerr", "cdrom", "serialize",
                  "autotune", "noautotune", "minus8", "swapdata", "bswap",
                  "noflush", "remap", "remap63", "scsi", NULL };
            unit = s[2] - 'a';
            hw   = unit / MAX_DRIVES;
            unit = unit % MAX_DRIVES;
            hwif = &ide_hwifs[hw];
            drive = &hwif->drives[unit];
            if (strncmp(s + 4, "ide-", 4) == 0) {
                  strlcpy(drive->driver_req, s + 4, sizeof(drive->driver_req));
                  goto done;
            }
            switch (match_parm(&s[3], hd_words, vals, 3)) {
                  case -1: /* "none" */
                  case -2: /* "noprobe" */
                        drive->noprobe = 1;
                        goto done;
                  case -3: /* "nowerr" */
                        drive->bad_wstat = BAD_R_STAT;
                        hwif->noprobe = 0;
                        goto done;
                  case -4: /* "cdrom" */
                        drive->present = 1;
                        drive->media = ide_cdrom;
                        /* an ATAPI device ignores DRDY */
                        drive->ready_stat = 0;
                        hwif->noprobe = 0;
                        goto done;
                  case -5: /* "serialize" */
                        printk(" -- USE \"ide%d=serialize\" INSTEAD", hw);
                        goto do_serialize;
                  case -6: /* "autotune" */
                        drive->autotune = IDE_TUNE_AUTO;
                        goto obsolete_option;
                  case -7: /* "noautotune" */
                        drive->autotune = IDE_TUNE_NOAUTO;
                        goto obsolete_option;
                  case -9: /* "swapdata" */
                  case -10: /* "bswap" */
                        drive->bswap = 1;
                        goto done;
                  case -11: /* noflush */
                        drive->noflush = 1;
                        goto done;
                  case -12: /* "remap" */
                        drive->remap_0_to_1 = 1;
                        goto done;
                  case -13: /* "remap63" */
                        drive->sect0 = 63;
                        goto done;
                  case -14: /* "scsi" */
                        drive->scsi = 1;
                        goto done;
                  case 3: /* cyl,head,sect */
                        drive->media      = ide_disk;
                        drive->ready_stat = READY_STAT;
                        drive->cyl  = drive->bios_cyl  = vals[0];
                        drive->head = drive->bios_head = vals[1];
                        drive->sect = drive->bios_sect = vals[2];
                        drive->present    = 1;
                        drive->forced_geom = 1;
                        hwif->noprobe = 0;
                        goto done;
                  default:
                        goto bad_option;
            }
      }

      if (s[0] != 'i' || s[1] != 'd' || s[2] != 'e')
            goto bad_option;
      /*
       * Look for bus speed option:  "idebus="
       */
      if (s[3] == 'b' && s[4] == 'u' && s[5] == 's') {
            if (match_parm(&s[6], NULL, vals, 1) != 1)
                  goto bad_option;
            if (vals[0] >= 20 && vals[0] <= 66) {
                  idebus_parameter = vals[0];
            } else
                  printk(" -- BAD BUS SPEED! Expected value from 20 to 66");
            goto done;
      }
      /*
       * Look for interface options:  "idex="
       */
      if (s[3] >= '0' && s[3] <= max_hwif) {
            /*
             * Be VERY CAREFUL changing this: note hardcoded indexes below
             * (-8, -9, -10) are reserved to ease the hardcoding.
             */
            static const char *ide_words[] = {
                  "noprobe", "serialize", "autotune", "noautotune", 
                  "reset", "dma", "ata66", "minus8", "minus9",
                  "minus10", "four", "qd65xx", "ht6560b", "cmd640_vlb",
                  "dtc2278", "umc8672", "ali14xx", NULL };
            hw = s[3] - '0';
            hwif = &ide_hwifs[hw];
            i = match_parm(&s[4], ide_words, vals, 3);

            /*
             * Cryptic check to ensure chipset not already set for hwif.
             * Note: we can't depend on hwif->chipset here.
             */
            if ((i >= -18 && i <= -11) || (i > 0 && i <= 3)) {
                  /* chipset already specified */
                  if (is_chipset_set[hw])
                        goto bad_option;
                  if (i > -18 && i <= -11) {
                        /* these drivers are for "ide0=" only */
                        if (hw != 0)
                              goto bad_hwif;
                        /* chipset already specified for 2nd port */
                        if (is_chipset_set[hw+1])
                              goto bad_option;
                  }
                  is_chipset_set[hw] = 1;
                  printk("\n");
            }

            switch (i) {
#ifdef CONFIG_BLK_DEV_ALI14XX
                  case -17: /* "ali14xx" */
                        probe_ali14xx = 1;
                        goto done;
#endif
#ifdef CONFIG_BLK_DEV_UMC8672
                  case -16: /* "umc8672" */
                        probe_umc8672 = 1;
                        goto done;
#endif
#ifdef CONFIG_BLK_DEV_DTC2278
                  case -15: /* "dtc2278" */
                        probe_dtc2278 = 1;
                        goto done;
#endif
#ifdef CONFIG_BLK_DEV_CMD640
                  case -14: /* "cmd640_vlb" */
                  {
                        extern int cmd640_vlb; /* flag for cmd640.c */
                        cmd640_vlb = 1;
                        goto done;
                  }
#endif
#ifdef CONFIG_BLK_DEV_HT6560B
                  case -13: /* "ht6560b" */
                        probe_ht6560b = 1;
                        goto done;
#endif
#ifdef CONFIG_BLK_DEV_QD65XX
                  case -12: /* "qd65xx" */
                        probe_qd65xx = 1;
                        goto done;
#endif
#ifdef CONFIG_BLK_DEV_4DRIVES
                  case -11: /* "four" drives on one set of ports */
                  {
                        ide_hwif_t *mate = &ide_hwifs[hw^1];
                        mate->drives[0].select.all ^= 0x20;
                        mate->drives[1].select.all ^= 0x20;
                        hwif->chipset = mate->chipset = ide_4drives;
                        mate->irq = hwif->irq;
                        memcpy(mate->io_ports, hwif->io_ports, sizeof(hwif->io_ports));
                        goto do_serialize;
                  }
#endif /* CONFIG_BLK_DEV_4DRIVES */
                  case -10: /* minus10 */
                  case -9: /* minus9 */
                  case -8: /* minus8 */
                        goto bad_option;
                  case -7: /* ata66 */
#ifdef CONFIG_BLK_DEV_IDEPCI
                        hwif->udma_four = 1;
                        goto obsolete_option;
#else
                        goto bad_hwif;
#endif
                  case -6: /* dma */
                        hwif->autodma = 1;
                        goto obsolete_option;
                  case -5: /* "reset" */
                        hwif->reset = 1;
                        goto obsolete_option;
                  case -4: /* "noautotune" */
                        hwif->drives[0].autotune = IDE_TUNE_NOAUTO;
                        hwif->drives[1].autotune = IDE_TUNE_NOAUTO;
                        goto obsolete_option;
                  case -3: /* "autotune" */
                        hwif->drives[0].autotune = IDE_TUNE_AUTO;
                        hwif->drives[1].autotune = IDE_TUNE_AUTO;
                        goto obsolete_option;
                  case -2: /* "serialize" */
                  do_serialize:
                        hwif->mate = &ide_hwifs[hw^1];
                        hwif->mate->mate = hwif;
                        hwif->serialized = hwif->mate->serialized = 1;
                        goto obsolete_option;

                  case -1: /* "noprobe" */
                        hwif->noprobe = 1;
                        goto done;

                  case 1:     /* base */
                        vals[1] = vals[0] + 0x206; /* default ctl */
                  case 2: /* base,ctl */
                        vals[2] = 0;      /* default irq = probe for it */
                  case 3: /* base,ctl,irq */
                        hwif->hw.irq = vals[2];
                        ide_init_hwif_ports(&hwif->hw, (unsigned long) vals[0], (unsigned long) vals[1], &hwif->irq);
                        memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
                        hwif->irq      = vals[2];
                        hwif->noprobe  = 0;
                        hwif->chipset  = ide_forced;
                        goto obsolete_option;

                  case 0: goto bad_option;
                  default:
                        printk(" -- SUPPORT NOT CONFIGURED IN THIS KERNEL\n");
                        return 1;
            }
      }
bad_option:
      printk(" -- BAD OPTION\n");
      return 1;
obsolete_option:
      printk(" -- OBSOLETE OPTION, WILL BE REMOVED SOON!\n");
      return 1;
bad_hwif:
      printk("-- NOT SUPPORTED ON ide%d", hw);
done:
      printk("\n");
      return 1;
}

extern void pnpide_init(void);
extern void h8300_ide_init(void);

/*
 * probe_for_hwifs() finds/initializes "known" IDE interfaces
 */
static void __init probe_for_hwifs (void)
{
#ifdef CONFIG_BLK_DEV_IDEPCI
      ide_scan_pcibus(ide_scan_direction);
#endif /* CONFIG_BLK_DEV_IDEPCI */

#ifdef CONFIG_ETRAX_IDE
      {
            extern void init_e100_ide(void);
            init_e100_ide();
      }
#endif /* CONFIG_ETRAX_IDE */
#ifdef CONFIG_BLK_DEV_CMD640
      {
            extern void ide_probe_for_cmd640x(void);
            ide_probe_for_cmd640x();
      }
#endif /* CONFIG_BLK_DEV_CMD640 */
#ifdef CONFIG_BLK_DEV_IDE_PMAC
      {
            extern void pmac_ide_probe(void);
            pmac_ide_probe();
      }
#endif /* CONFIG_BLK_DEV_IDE_PMAC */
#ifdef CONFIG_BLK_DEV_GAYLE
      {
            extern void gayle_init(void);
            gayle_init();
      }
#endif /* CONFIG_BLK_DEV_GAYLE */
#ifdef CONFIG_BLK_DEV_FALCON_IDE
      {
            extern void falconide_init(void);
            falconide_init();
      }
#endif /* CONFIG_BLK_DEV_FALCON_IDE */
#ifdef CONFIG_BLK_DEV_MAC_IDE
      {
            extern void macide_init(void);
            macide_init();
      }
#endif /* CONFIG_BLK_DEV_MAC_IDE */
#ifdef CONFIG_BLK_DEV_Q40IDE
      {
            extern void q40ide_init(void);
            q40ide_init();
      }
#endif /* CONFIG_BLK_DEV_Q40IDE */
#ifdef CONFIG_BLK_DEV_BUDDHA
      {
            extern void buddha_init(void);
            buddha_init();
      }
#endif /* CONFIG_BLK_DEV_BUDDHA */
#ifdef CONFIG_BLK_DEV_IDEPNP
      pnpide_init();
#endif
#ifdef CONFIG_H8300
      h8300_ide_init();
#endif
}

void ide_register_subdriver(ide_drive_t *drive, ide_driver_t *driver)
{
#ifdef CONFIG_PROC_FS
      ide_add_proc_entries(drive->proc, driver->proc, drive);
#endif
}

EXPORT_SYMBOL(ide_register_subdriver);

/**
 *    ide_unregister_subdriver      -     disconnect drive from driver
 *    @drive: drive to unplug
 *    @driver: driver
 *
 *    Disconnect a drive from the driver it was attached to and then
 *    clean up the various proc files and other objects attached to it.
 *
 *    Takes ide_setting_sem and ide_lock.
 *    Caller must hold none of the locks.
 */

void ide_unregister_subdriver(ide_drive_t *drive, ide_driver_t *driver)
{
      unsigned long flags;
      
      down(&ide_setting_sem);
      spin_lock_irqsave(&ide_lock, flags);
#ifdef CONFIG_PROC_FS
      ide_remove_proc_entries(drive->proc, driver->proc);
#endif
      auto_remove_settings(drive);
      spin_unlock_irqrestore(&ide_lock, flags);
      up(&ide_setting_sem);
}

EXPORT_SYMBOL(ide_unregister_subdriver);

/*
 * Probe module
 */

EXPORT_SYMBOL(ide_lock);

static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
      return 1;
}

static char *media_string(ide_drive_t *drive)
{
      switch (drive->media) {
      case ide_disk:
            return "disk";
      case ide_cdrom:
            return "cdrom";
      case ide_tape:
            return "tape";
      case ide_floppy:
            return "floppy";
      default:
            return "UNKNOWN";
      }
}

static ssize_t media_show(struct device *dev, struct device_attribute *attr, char *buf)
{
      ide_drive_t *drive = to_ide_device(dev);
      return sprintf(buf, "%s\n", media_string(drive));
}

static ssize_t drivename_show(struct device *dev, struct device_attribute *attr, char *buf)
{
      ide_drive_t *drive = to_ide_device(dev);
      return sprintf(buf, "%s\n", drive->name);
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
{
      ide_drive_t *drive = to_ide_device(dev);
      return sprintf(buf, "ide:m-%s\n", media_string(drive));
}

static struct device_attribute ide_dev_attrs[] = {
      __ATTR_RO(media),
      __ATTR_RO(drivename),
      __ATTR_RO(modalias),
      __ATTR_NULL
};

static int ide_uevent(struct device *dev, char **envp, int num_envp,
                  char *buffer, int buffer_size)
{
      ide_drive_t *drive = to_ide_device(dev);
      int i = 0;
      int length = 0;

      add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
                   "MEDIA=%s", media_string(drive));
      add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
                   "DRIVENAME=%s", drive->name);
      add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
                   "MODALIAS=ide:m-%s", media_string(drive));
      envp[i] = NULL;
      return 0;
}

static int generic_ide_probe(struct device *dev)
{
      ide_drive_t *drive = to_ide_device(dev);
      ide_driver_t *drv = to_ide_driver(dev->driver);

      return drv->probe ? drv->probe(drive) : -ENODEV;
}

static int generic_ide_remove(struct device *dev)
{
      ide_drive_t *drive = to_ide_device(dev);
      ide_driver_t *drv = to_ide_driver(dev->driver);

      if (drv->remove)
            drv->remove(drive);

      return 0;
}

static void generic_ide_shutdown(struct device *dev)
{
      ide_drive_t *drive = to_ide_device(dev);
      ide_driver_t *drv = to_ide_driver(dev->driver);

      if (dev->driver && drv->shutdown)
            drv->shutdown(drive);
}

struct bus_type ide_bus_type = {
      .name       = "ide",
      .match            = ide_bus_match,
      .uevent           = ide_uevent,
      .probe            = generic_ide_probe,
      .remove           = generic_ide_remove,
      .shutdown   = generic_ide_shutdown,
      .dev_attrs  = ide_dev_attrs,
      .suspend    = generic_ide_suspend,
      .resume           = generic_ide_resume,
};

EXPORT_SYMBOL_GPL(ide_bus_type);

/*
 * This is gets invoked once during initialization, to set *everything* up
 */
static int __init ide_init(void)
{
      printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
      system_bus_speed = ide_system_bus_speed();

      bus_register(&ide_bus_type);

      init_ide_data();

#ifdef CONFIG_PROC_FS
      proc_ide_root = proc_mkdir("ide", NULL);
#endif

#ifdef CONFIG_BLK_DEV_ALI14XX
      if (probe_ali14xx)
            (void)ali14xx_init();
#endif
#ifdef CONFIG_BLK_DEV_UMC8672
      if (probe_umc8672)
            (void)umc8672_init();
#endif
#ifdef CONFIG_BLK_DEV_DTC2278
      if (probe_dtc2278)
            (void)dtc2278_init();
#endif
#ifdef CONFIG_BLK_DEV_HT6560B
      if (probe_ht6560b)
            (void)ht6560b_init();
#endif
#ifdef CONFIG_BLK_DEV_QD65XX
      if (probe_qd65xx)
            (void)qd65xx_init();
#endif

      initializing = 1;
      /* Probe for special PCI and other "known" interface chipsets. */
      probe_for_hwifs();
      initializing = 0;

#ifdef CONFIG_PROC_FS
      proc_ide_create();
#endif
      return 0;
}

#ifdef MODULE
static char *options = NULL;
module_param(options, charp, 0);
MODULE_LICENSE("GPL");

static void __init parse_options (char *line)
{
      char *next = line;

      if (line == NULL || !*line)
            return;
      while ((line = next) != NULL) {
            if ((next = strchr(line,' ')) != NULL)
                  *next++ = 0;
            if (!ide_setup(line))
                  printk (KERN_INFO "Unknown option '%s'\n", line);
      }
}

int __init init_module (void)
{
      parse_options(options);
      return ide_init();
}

void cleanup_module (void)
{
      int index;

      for (index = 0; index < MAX_HWIFS; ++index)
            ide_unregister(index);

#ifdef CONFIG_PROC_FS
      proc_ide_destroy();
#endif

      bus_unregister(&ide_bus_type);
}

#else /* !MODULE */

__setup("", ide_setup);

module_init(ide_init);

#endif /* MODULE */

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