#ifndef _IDE_H
  #define _IDE_H
  /*
   *  linux/include/linux/ide.h
   *
   *  Copyright (C) 1994-2002  Linus Torvalds & authors
   */

  #include <linux/init.h>
  #include <linux/ioport.h>

  #include <linux/ata.h>

  #include <linux/blkdev.h>
  #include <linux/proc_fs.h>
  #include <linux/interrupt.h>
  #include <linux/bitops.h>
  #include <linux/bio.h>
  #include <linux/device.h>
  #include <linux/pci.h>

  #include <linux/completion.h>

  #include <linux/pm.h>

  #ifdef CONFIG_BLK_DEV_IDEACPI
  #include <acpi/acpi.h>
  #endif

  #include <asm/byteorder.h>
  #include <asm/system.h>
  #include <asm/io.h>

  #include <asm/mutex.h>

  #if defined(CONFIG_CRIS) || defined(CONFIG_FRV)

  # define SUPPORT_VLB_SYNC 0
  #else
  # define SUPPORT_VLB_SYNC 1

  #endif
  
  /*
   * Used to indicate "no IRQ", should be a value that cannot be an IRQ
   * number.
   */
   
  #define IDE_NO_IRQ		(-1)

  typedef unsigned char	byte;	/* used everywhere */
  
  /*
   * Probably not wise to fiddle with these
   */
  #define ERROR_MAX	8	/* Max read/write errors per sector */
  #define ERROR_RESET	3	/* Reset controller every 4th retry */
  #define ERROR_RECAL	1	/* Recalibrate every 2nd retry */
  
  /*

   * state flags
   */
  
  #define DMA_PIO_RETRY	1	/* retrying in PIO */
  
  #define HWIF(drive)		((ide_hwif_t *)((drive)->hwif))
  #define HWGROUP(drive)		((ide_hwgroup_t *)(HWIF(drive)->hwgroup))
  
  /*
   * Definitions for accessing IDE controller registers
   */
  #define IDE_NR_PORTS		(10)

  struct ide_io_ports {
  	unsigned long	data_addr;
  
  	union {
  		unsigned long error_addr;	/*   read:  error */
  		unsigned long feature_addr;	/*  write: feature */
  	};
  
  	unsigned long	nsect_addr;
  	unsigned long	lbal_addr;
  	unsigned long	lbam_addr;
  	unsigned long	lbah_addr;
  
  	unsigned long	device_addr;
  
  	union {
  		unsigned long status_addr;	/*  read: status  */
  		unsigned long command_addr;	/* write: command */
  	};
  
  	unsigned long	ctl_addr;
  
  	unsigned long	irq_addr;
  };

  
  #define OK_STAT(stat,good,bad)	(((stat)&((good)|(bad)))==(good))

  #define BAD_R_STAT	(ATA_BUSY | ATA_ERR)
  #define BAD_W_STAT	(BAD_R_STAT | ATA_DF)
  #define BAD_STAT	(BAD_R_STAT | ATA_DRQ)
  #define DRIVE_READY	(ATA_DRDY | ATA_DSC)
  
  #define BAD_CRC		(ATA_ABORTED | ATA_ICRC)

  
  #define SATA_NR_PORTS		(3)	/* 16 possible ?? */
  
  #define SATA_STATUS_OFFSET	(0)

  #define SATA_ERROR_OFFSET	(1)

  #define SATA_CONTROL_OFFSET	(2)

  /*
   * Our Physical Region Descriptor (PRD) table should be large enough
   * to handle the biggest I/O request we are likely to see.  Since requests
   * can have no more than 256 sectors, and since the typical blocksize is
   * two or more sectors, we could get by with a limit of 128 entries here for
   * the usual worst case.  Most requests seem to include some contiguous blocks,
   * further reducing the number of table entries required.
   *
   * The driver reverts to PIO mode for individual requests that exceed
   * this limit (possible with 512 byte blocksizes, eg. MSDOS f/s), so handling
   * 100% of all crazy scenarios here is not necessary.
   *
   * As it turns out though, we must allocate a full 4KB page for this,
   * so the two PRD tables (ide0 & ide1) will each get half of that,
   * allowing each to have about 256 entries (8 bytes each) from this.
   */
  #define PRD_BYTES       8
  #define PRD_ENTRIES	256
  
  /*
   * Some more useful definitions
   */
  #define PARTN_BITS	6	/* number of minor dev bits for partitions */
  #define MAX_DRIVES	2	/* per interface; 2 assumed by lots of code */
  #define SECTOR_SIZE	512

  #define IDE_LARGE_SEEK(b1,b2,t)	(((b1) > (b2) + (t)) || ((b2) > (b1) + (t)))
  
  /*
   * Timeouts for various operations:
   */
  #define WAIT_DRQ	(HZ/10)		/* 100msec - spec allows up to 20ms */
  #define WAIT_READY	(5*HZ)		/* 5sec - some laptops are very slow */
  #define WAIT_PIDENTIFY	(10*HZ)	/* 10sec  - should be less than 3ms (?), if all ATAPI CD is closed at boot */
  #define WAIT_WORSTCASE	(30*HZ)	/* 30sec  - worst case when spinning up */
  #define WAIT_CMD	(10*HZ)	/* 10sec  - maximum wait for an IRQ to happen */
  #define WAIT_MIN_SLEEP	(2*HZ/100)	/* 20msec - minimum sleep time */

  /*

   * Op codes for special requests to be handled by ide_special_rq().
   * Values should be in the range of 0x20 to 0x3f.
   */
  #define REQ_DRIVE_RESET		0x20
  
  /*

   * Check for an interrupt and acknowledge the interrupt status
   */
  struct hwif_s;
  typedef int (ide_ack_intr_t)(struct hwif_s *);

  /*
   * hwif_chipset_t is used to keep track of the specific hardware
   * chipset used by each IDE interface, if known.
   */

  enum {		ide_unknown,	ide_generic,	ide_pci,

  		ide_cmd640,	ide_dtc2278,	ide_ali14xx,
  		ide_qd65xx,	ide_umc8672,	ide_ht6560b,
  		ide_rz1000,	ide_trm290,
  		ide_cmd646,	ide_cy82c693,	ide_4drives,

  		ide_pmac,	ide_acorn,

  		ide_au1xxx,	ide_palm3710

  };
  
  typedef u8 hwif_chipset_t;

  
  /*
   * Structure to hold all information about the location of this port
   */
  typedef struct hw_regs_s {

  	union {
  		struct ide_io_ports	io_ports;
  		unsigned long		io_ports_array[IDE_NR_PORTS];
  	};

  	int		irq;			/* our irq number */

  	ide_ack_intr_t	*ack_intr;		/* acknowledge interrupt */
  	hwif_chipset_t  chipset;

  	struct device	*dev, *parent;

  	unsigned long	config;

  } hw_regs_t;

  void ide_init_port_data(struct hwif_s *, unsigned int);

  void ide_init_port_hw(struct hwif_s *, hw_regs_t *);

  static inline void ide_std_init_ports(hw_regs_t *hw,
  				      unsigned long io_addr,
  				      unsigned long ctl_addr)
  {
  	unsigned int i;

  	for (i = 0; i <= 7; i++)
  		hw->io_ports_array[i] = io_addr++;

  	hw->io_ports.ctl_addr = ctl_addr;

  }

  /* for IDE PCI controllers in legacy mode, temporary */
  static inline int __ide_default_irq(unsigned long base)
  {
  	switch (base) {
  #ifdef CONFIG_IA64
  	case 0x1f0: return isa_irq_to_vector(14);
  	case 0x170: return isa_irq_to_vector(15);
  #else
  	case 0x1f0: return 14;
  	case 0x170: return 15;
  #endif
  	}
  	return 0;
  }

  #if defined(CONFIG_ARM) || defined(CONFIG_FRV) || defined(CONFIG_M68K) || \
      defined(CONFIG_MIPS) || defined(CONFIG_MN10300) || defined(CONFIG_PARISC) \
      || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || defined(CONFIG_SPARC64)

  #include <asm/ide.h>

  #else
  #include <asm-generic/ide_iops.h>
  #endif

  #define MAX_HWIFS	10

  /* Currently only m68k, apus and m8xx need it */
  #ifndef IDE_ARCH_ACK_INTR
  # define ide_ack_intr(hwif) (1)
  #endif
  
  /* Currently only Atari needs it */
  #ifndef IDE_ARCH_LOCK
  # define ide_release_lock()			do {} while (0)
  # define ide_get_lock(hdlr, data)		do {} while (0)
  #endif /* IDE_ARCH_LOCK */
  
  /*
   * Now for the data we need to maintain per-drive:  ide_drive_t
   */
  
  #define ide_scsi	0x21
  #define ide_disk	0x20
  #define ide_optical	0x7
  #define ide_cdrom	0x5
  #define ide_tape	0x1
  #define ide_floppy	0x0
  
  /*
   * Special Driver Flags
   *
   * set_geometry	: respecify drive geometry
   * recalibrate	: seek to cyl 0
   * set_multmode	: set multmode count
   * set_tune	: tune interface for drive
   * serviced	: service command
   * reserved	: unused
   */
  typedef union {
  	unsigned all			: 8;
  	struct {

  		unsigned set_geometry	: 1;
  		unsigned recalibrate	: 1;
  		unsigned set_multmode	: 1;
  		unsigned set_tune	: 1;
  		unsigned serviced	: 1;
  		unsigned reserved	: 3;

  	} b;
  } special_t;
  
  /*

   * ATA-IDE Select Register, aka Device-Head
   *
   * head		: always zeros here
   * unit		: drive select number: 0/1
   * bit5		: always 1
   * lba		: using LBA instead of CHS
   * bit7		: always 1
   */
  typedef union {
  	unsigned all			: 8;
  	struct {
  #if defined(__LITTLE_ENDIAN_BITFIELD)
  		unsigned head		: 4;
  		unsigned unit		: 1;
  		unsigned bit5		: 1;
  		unsigned lba		: 1;
  		unsigned bit7		: 1;
  #elif defined(__BIG_ENDIAN_BITFIELD)
  		unsigned bit7		: 1;
  		unsigned lba		: 1;
  		unsigned bit5		: 1;
  		unsigned unit		: 1;
  		unsigned head		: 4;
  #else
  #error "Please fix <asm/byteorder.h>"
  #endif
  	} b;
  } select_t, ata_select_t;
  
  /*

   * Status returned from various ide_ functions
   */
  typedef enum {
  	ide_stopped,	/* no drive operation was started */
  	ide_started,	/* a drive operation was started, handler was set */
  } ide_startstop_t;

  struct ide_devset;

  struct ide_driver_s;

  #ifdef CONFIG_BLK_DEV_IDEACPI
  struct ide_acpi_drive_link;
  struct ide_acpi_hwif_link;
  #endif

  /* ATAPI device flags */
  enum {
  	IDE_AFLAG_DRQ_INTERRUPT		= (1 << 0),
  	IDE_AFLAG_MEDIA_CHANGED		= (1 << 1),

  	/* Drive cannot lock the door. */
  	IDE_AFLAG_NO_DOORLOCK		= (1 << 2),

  
  	/* ide-cd */

  	/* Drive cannot eject the disc. */
  	IDE_AFLAG_NO_EJECT		= (1 << 3),
  	/* Drive is a pre ATAPI 1.2 drive. */
  	IDE_AFLAG_PRE_ATAPI12		= (1 << 4),
  	/* TOC addresses are in BCD. */
  	IDE_AFLAG_TOCADDR_AS_BCD	= (1 << 5),
  	/* TOC track numbers are in BCD. */
  	IDE_AFLAG_TOCTRACKS_AS_BCD	= (1 << 6),
  	/*
  	 * Drive does not provide data in multiples of SECTOR_SIZE
  	 * when more than one interrupt is needed.
  	 */
  	IDE_AFLAG_LIMIT_NFRAMES		= (1 << 7),
  	/* Seeking in progress. */
  	IDE_AFLAG_SEEKING		= (1 << 8),
  	/* Saved TOC information is current. */
  	IDE_AFLAG_TOC_VALID		= (1 << 9),
  	/* We think that the drive door is locked. */
  	IDE_AFLAG_DOOR_LOCKED		= (1 << 10),
  	/* SET_CD_SPEED command is unsupported. */
  	IDE_AFLAG_NO_SPEED_SELECT	= (1 << 11),
  	IDE_AFLAG_VERTOS_300_SSD	= (1 << 12),
  	IDE_AFLAG_VERTOS_600_ESD	= (1 << 13),
  	IDE_AFLAG_SANYO_3CD		= (1 << 14),
  	IDE_AFLAG_FULL_CAPS_PAGE	= (1 << 15),
  	IDE_AFLAG_PLAY_AUDIO_OK		= (1 << 16),
  	IDE_AFLAG_LE_SPEED_FIELDS	= (1 << 17),
  
  	/* ide-floppy */
  	/* Format in progress */
  	IDE_AFLAG_FORMAT_IN_PROGRESS	= (1 << 18),
  	/* Avoid commands not supported in Clik drive */
  	IDE_AFLAG_CLIK_DRIVE		= (1 << 19),
  	/* Requires BH algorithm for packets */
  	IDE_AFLAG_ZIP_DRIVE		= (1 << 20),

  	/* Write protect */
  	IDE_AFLAG_WP			= (1 << 21),
  	/* Supports format progress report */
  	IDE_AFLAG_SRFP			= (1 << 22),

  
  	/* ide-tape */

  	IDE_AFLAG_IGNORE_DSC		= (1 << 23),

  	/* 0 When the tape position is unknown */

  	IDE_AFLAG_ADDRESS_VALID		= (1 <<	24),

  	/* Device already opened */

  	IDE_AFLAG_BUSY			= (1 << 25),

  	/* Attempt to auto-detect the current user block size */

  	IDE_AFLAG_DETECT_BS		= (1 << 26),

  	/* Currently on a filemark */

  	IDE_AFLAG_FILEMARK		= (1 << 27),

  	/* 0 = no tape is loaded, so we don't rewind after ejecting */

  	IDE_AFLAG_MEDIUM_PRESENT	= (1 << 28),

  	IDE_AFLAG_NO_AUTOCLOSE		= (1 << 29),

  };

  struct ide_drive_s {

  	char		name[4];	/* drive name, such as "hda" */
          char            driver_req[10];	/* requests specific driver */

  	struct request_queue	*queue;	/* request queue */

  
  	struct request		*rq;	/* current request */
  	struct ide_drive_s 	*next;	/* circular list of hwgroup drives */

  	void		*driver_data;	/* extra driver data */

  	u16			*id;	/* identification info */

  #ifdef CONFIG_IDE_PROC_FS

  	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */

  	const struct ide_devset **settings; /* /proc/ide/ drive settings */

  #endif

  	struct hwif_s		*hwif;	/* actually (ide_hwif_t *) */
  
  	unsigned long sleep;		/* sleep until this time */
  	unsigned long service_start;	/* time we started last request */
  	unsigned long service_time;	/* service time of last request */
  	unsigned long timeout;		/* max time to wait for irq */
  
  	special_t	special;	/* special action flags */
  	select_t	select;		/* basic drive/head select reg value */

  	u8	retry_pio;		/* retrying dma capable host in pio */
  	u8	state;			/* retry state */
  	u8	waiting_for_dma;	/* dma currently in progress */

  	unsigned keep_settings	: 1;	/* restore settings after drive reset */
  	unsigned using_dma	: 1;	/* disk is using dma for read/write */
  	unsigned unmask		: 1;	/* okay to unmask other irqs */
  	unsigned noflush	: 1;	/* don't attempt flushes */
  	unsigned dsc_overlap	: 1;	/* DSC overlap */
  	unsigned nice1		: 1;	/* give potential excess bandwidth */

  	unsigned present	: 1;	/* drive is physically present */
  	unsigned dead		: 1;	/* device ejected hint */
  	unsigned id_read	: 1;	/* 1=id read from disk 0 = synthetic */
  	unsigned noprobe 	: 1;	/* from:  hdx=noprobe */
  	unsigned removable	: 1;	/* 1 if need to do check_media_change */
  	unsigned attach		: 1;	/* needed for removable devices */

  	unsigned forced_geom	: 1;	/* 1 if hdx=c,h,s was given at boot */
  	unsigned no_unmask	: 1;	/* disallow setting unmask bit */
  	unsigned no_io_32bit	: 1;	/* disallow enabling 32bit I/O */

  	unsigned doorlocking	: 1;	/* for removable only: door lock/unlock works */

  	unsigned nodma		: 1;	/* disallow DMA */

  	unsigned blocked        : 1;	/* 1=powermanagment told us not to do anything, so sleep nicely */

  	unsigned scsi		: 1;	/* 0=default, 1=ide-scsi emulation */
  	unsigned sleeping	: 1;	/* 1=sleeping & sleep field valid */
  	unsigned post_reset	: 1;

  	unsigned udma33_warned	: 1;

  	unsigned addressing	: 2;	/* 0=28-bit, 1=48-bit, 2=48-bit doing 28-bit */
  	unsigned wcache		: 1;	/* status of write cache */
  	unsigned nowerr		: 1;	/* used for ignoring ATA_DF */

  
          u8	quirk_list;	/* considered quirky, set for a specific host */
          u8	init_speed;	/* transfer rate set at boot */

          u8	current_speed;	/* current transfer rate set */

  	u8	desired_speed;	/* desired transfer rate set */

          u8	dn;		/* now wide spread use */

  	u8	acoustic;	/* acoustic management */
  	u8	media;		/* disk, cdrom, tape, floppy, ... */

  	u8	ready_stat;	/* min status value for drive ready */
  	u8	mult_count;	/* current multiple sector setting */
  	u8	mult_req;	/* requested multiple sector setting */
  	u8	tune_req;	/* requested drive tuning setting */
  	u8	io_32bit;	/* 0=16-bit, 1=32-bit, 2/3=32bit+sync */

  	u8	bad_wstat;	/* used for ignoring ATA_DF */

  	u8	head;		/* "real" number of heads */
  	u8	sect;		/* "real" sectors per track */
  	u8	bios_head;	/* BIOS/fdisk/LILO number of heads */
  	u8	bios_sect;	/* BIOS/fdisk/LILO sectors per track */
  
  	unsigned int	bios_cyl;	/* BIOS/fdisk/LILO number of cyls */
  	unsigned int	cyl;		/* "real" number of cyls */

  	unsigned int	drive_data;	/* used by set_pio_mode/selectproc */

  	unsigned int	failures;	/* current failure count */
  	unsigned int	max_failures;	/* maximum allowed failure count */

  	u64		probed_capacity;/* initial reported media capacity (ide-cd only currently) */

  
  	u64		capacity64;	/* total number of sectors */
  
  	int		lun;		/* logical unit */
  	int		crc_count;	/* crc counter to reduce drive speed */

  #ifdef CONFIG_BLK_DEV_IDEACPI
  	struct ide_acpi_drive_link *acpidata;
  #endif

  	struct list_head list;
  	struct device	gendev;

  	struct completion gendev_rel_comp;	/* to deal with device release() */

  
  	/* callback for packet commands */
  	void (*pc_callback)(struct ide_drive_s *);

  
  	unsigned long atapi_flags;

  };
  
  typedef struct ide_drive_s ide_drive_t;

  #define to_ide_device(dev)container_of(dev, ide_drive_t, gendev)

  struct ide_task_s;

  struct ide_port_info;

  struct ide_tp_ops {
  	void	(*exec_command)(struct hwif_s *, u8);
  	u8	(*read_status)(struct hwif_s *);
  	u8	(*read_altstatus)(struct hwif_s *);
  	u8	(*read_sff_dma_status)(struct hwif_s *);
  
  	void	(*set_irq)(struct hwif_s *, int);
  
  	void	(*tf_load)(ide_drive_t *, struct ide_task_s *);
  	void	(*tf_read)(ide_drive_t *, struct ide_task_s *);
  
  	void	(*input_data)(ide_drive_t *, struct request *, void *,
  			      unsigned int);
  	void	(*output_data)(ide_drive_t *, struct request *, void *,
  			       unsigned int);
  };
  
  extern const struct ide_tp_ops default_tp_ops;

  /**
   * struct ide_port_ops - IDE port operations
   *
   * @init_dev:		host specific initialization of a device
   * @set_pio_mode:	routine to program host for PIO mode
   * @set_dma_mode:	routine to program host for DMA mode
   * @selectproc:		tweaks hardware to select drive
   * @reset_poll:		chipset polling based on hba specifics
   * @pre_reset:		chipset specific changes to default for device-hba resets
   * @resetproc:		routine to reset controller after a disk reset
   * @maskproc:		special host masking for drive selection
   * @quirkproc:		check host's drive quirk list
   *
   * @mdma_filter:	filter MDMA modes
   * @udma_filter:	filter UDMA modes
   *
   * @cable_detect:	detect cable type
   */

  struct ide_port_ops {

  	void	(*init_dev)(ide_drive_t *);

  	void	(*set_pio_mode)(ide_drive_t *, const u8);

  	void	(*set_dma_mode)(ide_drive_t *, const u8);

  	void	(*selectproc)(ide_drive_t *);

  	int	(*reset_poll)(ide_drive_t *);

  	void	(*pre_reset)(ide_drive_t *);

  	void	(*resetproc)(ide_drive_t *);

  	void	(*maskproc)(ide_drive_t *, int);

  	void	(*quirkproc)(ide_drive_t *);
  
  	u8	(*mdma_filter)(ide_drive_t *);
  	u8	(*udma_filter)(ide_drive_t *);
  
  	u8	(*cable_detect)(struct hwif_s *);
  };

  struct ide_dma_ops {
  	void	(*dma_host_set)(struct ide_drive_s *, int);
  	int	(*dma_setup)(struct ide_drive_s *);
  	void	(*dma_exec_cmd)(struct ide_drive_s *, u8);
  	void	(*dma_start)(struct ide_drive_s *);
  	int	(*dma_end)(struct ide_drive_s *);
  	int	(*dma_test_irq)(struct ide_drive_s *);
  	void	(*dma_lost_irq)(struct ide_drive_s *);
  	void	(*dma_timeout)(struct ide_drive_s *);
  };

  struct ide_host;

  typedef struct hwif_s {
  	struct hwif_s *next;		/* for linked-list in ide_hwgroup_t */
  	struct hwif_s *mate;		/* other hwif from same PCI chip */
  	struct hwgroup_s *hwgroup;	/* actually (ide_hwgroup_t *) */
  	struct proc_dir_entry *proc;	/* /proc/ide/ directory entry */

  	struct ide_host *host;

  	char name[6];			/* name of interface, eg. "ide0" */

  	struct ide_io_ports	io_ports;

  	unsigned long	sata_scr[SATA_NR_PORTS];

  	ide_drive_t	drives[MAX_DRIVES];	/* drive info */
  
  	u8 major;	/* our major number */
  	u8 index;	/* 0 for ide0; 1 for ide1; ... */
  	u8 channel;	/* for dual-port chips: 0=primary, 1=secondary */

  	u32 host_flags;

  	u8 pio_mask;

  	u8 ultra_mask;
  	u8 mwdma_mask;
  	u8 swdma_mask;

  	u8 cbl;		/* cable type */

  	hwif_chipset_t chipset;	/* sub-module for tuning.. */

  	struct device *dev;

  	ide_ack_intr_t *ack_intr;

  	void (*rw_disk)(ide_drive_t *, struct request *);

  	const struct ide_tp_ops		*tp_ops;

  	const struct ide_port_ops	*port_ops;

  	const struct ide_dma_ops	*dma_ops;

  	void (*ide_dma_clear_irq)(ide_drive_t *drive);

  	/* dma physical region descriptor table (cpu view) */
  	unsigned int	*dmatable_cpu;
  	/* dma physical region descriptor table (dma view) */
  	dma_addr_t	dmatable_dma;
  	/* Scatter-gather list used to build the above */
  	struct scatterlist *sg_table;
  	int sg_max_nents;		/* Maximum number of entries in it */
  	int sg_nents;			/* Current number of entries in it */
  	int sg_dma_direction;		/* dma transfer direction */
  
  	/* data phase of the active command (currently only valid for PIO/DMA) */
  	int		data_phase;
  
  	unsigned int nsect;
  	unsigned int nleft;

  	struct scatterlist *cursg;

  	unsigned int cursg_ofs;

  	int		rqsize;		/* max sectors per request */
  	int		irq;		/* our irq number */

  	unsigned long	dma_base;	/* base addr for dma ports */

  	unsigned long	config_data;	/* for use by chipset-specific code */
  	unsigned long	select_data;	/* for use by chipset-specific code */

  	unsigned long	extra_base;	/* extra addr for dma ports */
  	unsigned	extra_ports;	/* number of extra dma ports */

  	unsigned	present    : 1;	/* this interface exists */

  	unsigned	serialized : 1;	/* serialized all channel operation */
  	unsigned	sharing_irq: 1;	/* 1 = sharing irq with another hwif */

  	unsigned	sg_mapped  : 1;	/* sg_table and sg_nents are ready */

  	struct device		gendev;
  	struct device		*portdev;

  	struct completion gendev_rel_comp; /* To deal with device release() */

  
  	void		*hwif_data;	/* extra hwif data */
  
  	unsigned dma;

  
  #ifdef CONFIG_BLK_DEV_IDEACPI
  	struct ide_acpi_hwif_link *acpidata;
  #endif

  } ____cacheline_internodealigned_in_smp ide_hwif_t;

  struct ide_host {
  	ide_hwif_t	*ports[MAX_HWIFS];
  	unsigned int	n_ports;

  	struct device	*dev[2];

  	unsigned int	(*init_chipset)(struct pci_dev *);

  	unsigned long	host_flags;

  	void		*host_priv;

  };

  /*
   *  internal ide interrupt handler type
   */

  typedef ide_startstop_t (ide_handler_t)(ide_drive_t *);
  typedef int (ide_expiry_t)(ide_drive_t *);

  /* used by ide-cd, ide-floppy, etc. */

  typedef void (xfer_func_t)(ide_drive_t *, struct request *rq, void *, unsigned);

  typedef struct hwgroup_s {
  		/* irq handler, if active */
  	ide_startstop_t	(*handler)(ide_drive_t *);

  		/* BOOL: protects all fields below */
  	volatile int busy;
  		/* BOOL: wake us up on timer expiry */
  	unsigned int sleeping	: 1;
  		/* BOOL: polling active & poll_timeout field valid */
  	unsigned int polling	: 1;

  		/* current drive */
  	ide_drive_t *drive;
  		/* ptr to current hwif in linked-list */
  	ide_hwif_t *hwif;

  		/* current request */
  	struct request *rq;

  		/* failsafe timer */
  	struct timer_list timer;

  		/* timeout value during long polls */
  	unsigned long poll_timeout;
  		/* queried upon timeouts */
  	int (*expiry)(ide_drive_t *);

  	int req_gen;
  	int req_gen_timer;

  } ide_hwgroup_t;

  typedef struct ide_driver_s ide_driver_t;

  extern struct mutex ide_setting_mtx;

  int get_io_32bit(ide_drive_t *);

  int set_io_32bit(ide_drive_t *, int);

  int get_ksettings(ide_drive_t *);

  int set_ksettings(ide_drive_t *, int);

  int set_pio_mode(ide_drive_t *, int);

  int get_unmaskirq(ide_drive_t *);

  int set_unmaskirq(ide_drive_t *, int);

  int get_using_dma(ide_drive_t *);

  int set_using_dma(ide_drive_t *, int);

  #define ide_devset_get(name, field) \
  int get_##name(ide_drive_t *drive) \
  { \
  	return drive->field; \
  }
  
  #define ide_devset_set(name, field) \
  int set_##name(ide_drive_t *drive, int arg) \
  { \
  	drive->field = arg; \
  	return 0; \
  }

  /* ATAPI packet command flags */
  enum {
  	/* set when an error is considered normal - no retry (ide-tape) */
  	PC_FLAG_ABORT			= (1 << 0),
  	PC_FLAG_SUPPRESS_ERROR		= (1 << 1),
  	PC_FLAG_WAIT_FOR_DSC		= (1 << 2),
  	PC_FLAG_DMA_OK			= (1 << 3),

  	PC_FLAG_DMA_IN_PROGRESS		= (1 << 4),
  	PC_FLAG_DMA_ERROR		= (1 << 5),
  	PC_FLAG_WRITING			= (1 << 6),

  	/* command timed out */

  	PC_FLAG_TIMEDOUT		= (1 << 7),

  };

  /*
   * With each packet command, we allocate a buffer of IDE_PC_BUFFER_SIZE bytes.
   * This is used for several packet commands (not for READ/WRITE commands).
   */
  #define IDE_PC_BUFFER_SIZE	256

  struct ide_atapi_pc {
  	/* actual packet bytes */
  	u8 c[12];
  	/* incremented on each retry */
  	int retries;
  	int error;
  
  	/* bytes to transfer */
  	int req_xfer;
  	/* bytes actually transferred */
  	int xferred;
  
  	/* data buffer */
  	u8 *buf;
  	/* current buffer position */
  	u8 *cur_pos;
  	int buf_size;
  	/* missing/available data on the current buffer */
  	int b_count;
  
  	/* the corresponding request */
  	struct request *rq;
  
  	unsigned long flags;
  
  	/*
  	 * those are more or less driver-specific and some of them are subject
  	 * to change/removal later.
  	 */

  	u8 pc_buf[IDE_PC_BUFFER_SIZE];

  	/* idetape only */
  	struct idetape_bh *bh;
  	char *b_data;
  
  	/* idescsi only for now */
  	struct scatterlist *sg;
  	unsigned int sg_cnt;
  
  	struct scsi_cmnd *scsi_cmd;
  	void (*done) (struct scsi_cmnd *);
  
  	unsigned long timeout;
  };

  #ifdef CONFIG_IDE_PROC_FS

  /*
   * configurable drive settings
   */

  #define S_READ		(1 << 0)
  #define S_WRITE		(1 << 1)
  #define S_RW		(S_READ | S_WRITE)
  #define S_NOLOCK	(1 << 2)
  
  struct ide_devset {
  	const char	*name;
  	unsigned int	flags;
  	int		min, max;
  	int		(*get)(ide_drive_t *);
  	int		(*set)(ide_drive_t *, int);
  	int		(*mulf)(ide_drive_t *);
  	int		(*divf)(ide_drive_t *);
  };
  
  #define __DEVSET(_name, _flags, _min, _max, _get, _set, _mulf, _divf) { \
  	.name	= __stringify(_name), \
  	.flags	= _flags, \
  	.min	= _min, \
  	.max	= _max, \
  	.get	= _get, \
  	.set	= _set, \
  	.mulf	= _mulf, \
  	.divf	= _divf, \
  }
  
  #define __IDE_DEVSET(_name, _flags, _min, _max, _get, _set, _mulf, _divf) \
  static const struct ide_devset ide_devset_##_name = \
  	__DEVSET(_name, _flags, _min, _max, _get, _set, _mulf, _divf)
  
  #define IDE_DEVSET(_name, _flags, _min, _max, _get, _set) \
  __IDE_DEVSET(_name, _flags, _min, _max, _get, _set, NULL, NULL)
  
  #define ide_devset_rw_nolock(_name, _min, _max, _func) \
  IDE_DEVSET(_name, S_RW | S_NOLOCK, _min, _max, get_##_func, set_##_func)
  
  #define ide_devset_w_nolock(_name, _min, _max, _func) \
  IDE_DEVSET(_name, S_WRITE | S_NOLOCK, _min, _max, NULL, set_##_func)
  
  #define ide_devset_rw(_name, _min, _max, _field) \
  static ide_devset_get(_name, _field); \
  static ide_devset_set(_name, _field); \
  IDE_DEVSET(_name, S_RW, _min, _max, get_##_name, set_##_name)
  
  #define ide_devset_r(_name, _min, _max, _field) \
  ide_devset_get(_name, _field) \
  IDE_DEVSET(_name, S_READ, _min, _max, get_##_name, NULL)

  
  /*
   * /proc/ide interface
   */
  typedef struct {
  	const char	*name;
  	mode_t		mode;
  	read_proc_t	*read_proc;
  	write_proc_t	*write_proc;
  } ide_proc_entry_t;

  void proc_ide_create(void);
  void proc_ide_destroy(void);

  void ide_proc_register_port(ide_hwif_t *);

  void ide_proc_port_register_devices(ide_hwif_t *);

  void ide_proc_unregister_device(ide_drive_t *);

  void ide_proc_unregister_port(ide_hwif_t *);

  void ide_proc_register_driver(ide_drive_t *, ide_driver_t *);
  void ide_proc_unregister_driver(ide_drive_t *, ide_driver_t *);

  read_proc_t proc_ide_read_capacity;
  read_proc_t proc_ide_read_geometry;

  /*
   * Standard exit stuff:
   */
  #define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) \
  {					\
  	len -= off;			\
  	if (len < count) {		\
  		*eof = 1;		\
  		if (len <= 0)		\
  			return 0;	\
  	} else				\
  		len = count;		\
  	*start = page + off;		\
  	return len;			\
  }
  #else

  static inline void proc_ide_create(void) { ; }
  static inline void proc_ide_destroy(void) { ; }

  static inline void ide_proc_register_port(ide_hwif_t *hwif) { ; }

  static inline void ide_proc_port_register_devices(ide_hwif_t *hwif) { ; }

  static inline void ide_proc_unregister_device(ide_drive_t *drive) { ; }

  static inline void ide_proc_unregister_port(ide_hwif_t *hwif) { ; }

  static inline void ide_proc_register_driver(ide_drive_t *drive, ide_driver_t *driver) { ; }
  static inline void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver) { ; }

  #define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) return 0;
  #endif
  
  /*
   * Power Management step value (rq->pm->pm_step).
   *
   * The step value starts at 0 (ide_pm_state_start_suspend) for a
   * suspend operation or 1000 (ide_pm_state_start_resume) for a
   * resume operation.
   *
   * For each step, the core calls the subdriver start_power_step() first.
   * This can return:
   *	- ide_stopped :	In this case, the core calls us back again unless
   *			step have been set to ide_power_state_completed.
   *	- ide_started :	In this case, the channel is left busy until an
   *			async event (interrupt) occurs.
   * Typically, start_power_step() will issue a taskfile request with
   * do_rw_taskfile().
   *
   * Upon reception of the interrupt, the core will call complete_power_step()
   * with the error code if any. This routine should update the step value
   * and return. It should not start a new request. The core will call
   * start_power_step for the new step value, unless step have been set to
   * ide_power_state_completed.
   *
   * Subdrivers are expected to define their own additional power
   * steps from 1..999 for suspend and from 1001..1999 for resume,
   * other values are reserved for future use.
   */
  
  enum {
  	ide_pm_state_completed		= -1,
  	ide_pm_state_start_suspend	= 0,
  	ide_pm_state_start_resume	= 1000,
  };
  
  /*
   * Subdrivers support.

   *
   * The gendriver.owner field should be set to the module owner of this driver.
   * The gendriver.name field should be set to the name of this driver

   */

  struct ide_driver_s {

  	const char			*version;
  	u8				media;

  	ide_startstop_t	(*do_request)(ide_drive_t *, struct request *, sector_t);
  	int		(*end_request)(ide_drive_t *, int, int);
  	ide_startstop_t	(*error)(ide_drive_t *, struct request *rq, u8, u8);

  	struct device_driver	gen_driver;

  	int		(*probe)(ide_drive_t *);
  	void		(*remove)(ide_drive_t *);

  	void		(*resume)(ide_drive_t *);

  	void		(*shutdown)(ide_drive_t *);

  #ifdef CONFIG_IDE_PROC_FS
  	ide_proc_entry_t	*proc;

  	const struct ide_devset	**settings;

  #endif
  };

  #define to_ide_driver(drv) container_of(drv, ide_driver_t, gen_driver)

  int ide_device_get(ide_drive_t *);
  void ide_device_put(ide_drive_t *);

  struct ide_ioctl_devset {
  	unsigned int	get_ioctl;
  	unsigned int	set_ioctl;
  
  	int		(*get)(ide_drive_t *);
  	int		(*set)(ide_drive_t *, int);
  };
  
  int ide_setting_ioctl(ide_drive_t *, struct block_device *, unsigned int,
  		      unsigned long, const struct ide_ioctl_devset *);
  
  int generic_ide_ioctl(ide_drive_t *, struct file *, struct block_device *,
  		      unsigned, unsigned long);

  extern int ide_vlb_clk;
  extern int ide_pci_clk;

  extern int ide_end_request (ide_drive_t *drive, int uptodate, int nrsecs);

  int ide_end_dequeued_request(ide_drive_t *drive, struct request *rq,
  			     int uptodate, int nr_sectors);

  extern void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry);

  void ide_execute_command(ide_drive_t *, u8, ide_handler_t *, unsigned int,
  			 ide_expiry_t *);

  void ide_execute_pkt_cmd(ide_drive_t *);

  void ide_pad_transfer(ide_drive_t *, int, int);

  ide_startstop_t __ide_error(ide_drive_t *, struct request *, u8, u8);

  ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat);

  void ide_fix_driveid(u16 *);

  extern void ide_fixstring(u8 *, const int, const int);

  int ide_busy_sleep(ide_hwif_t *, unsigned long, int);

  int ide_wait_stat(ide_startstop_t *, ide_drive_t *, u8, u8, unsigned long);

  extern ide_startstop_t ide_do_reset (ide_drive_t *);

  extern void ide_do_drive_cmd(ide_drive_t *, struct request *);

  extern void ide_end_drive_cmd(ide_drive_t *, u8, u8);

  enum {
  	IDE_TFLAG_LBA48			= (1 << 0),

  	IDE_TFLAG_FLAGGED		= (1 << 2),
  	IDE_TFLAG_OUT_DATA		= (1 << 3),
  	IDE_TFLAG_OUT_HOB_FEATURE	= (1 << 4),
  	IDE_TFLAG_OUT_HOB_NSECT		= (1 << 5),
  	IDE_TFLAG_OUT_HOB_LBAL		= (1 << 6),
  	IDE_TFLAG_OUT_HOB_LBAM		= (1 << 7),
  	IDE_TFLAG_OUT_HOB_LBAH		= (1 << 8),
  	IDE_TFLAG_OUT_HOB		= IDE_TFLAG_OUT_HOB_FEATURE |
  					  IDE_TFLAG_OUT_HOB_NSECT |
  					  IDE_TFLAG_OUT_HOB_LBAL |
  					  IDE_TFLAG_OUT_HOB_LBAM |
  					  IDE_TFLAG_OUT_HOB_LBAH,
  	IDE_TFLAG_OUT_FEATURE		= (1 << 9),
  	IDE_TFLAG_OUT_NSECT		= (1 << 10),
  	IDE_TFLAG_OUT_LBAL		= (1 << 11),
  	IDE_TFLAG_OUT_LBAM		= (1 << 12),
  	IDE_TFLAG_OUT_LBAH		= (1 << 13),
  	IDE_TFLAG_OUT_TF		= IDE_TFLAG_OUT_FEATURE |
  					  IDE_TFLAG_OUT_NSECT |
  					  IDE_TFLAG_OUT_LBAL |
  					  IDE_TFLAG_OUT_LBAM |
  					  IDE_TFLAG_OUT_LBAH,

  	IDE_TFLAG_OUT_DEVICE		= (1 << 14),

  	IDE_TFLAG_WRITE			= (1 << 15),

  	IDE_TFLAG_FLAGGED_SET_IN_FLAGS	= (1 << 16),
  	IDE_TFLAG_IN_DATA		= (1 << 17),

  	IDE_TFLAG_CUSTOM_HANDLER	= (1 << 18),

  	IDE_TFLAG_DMA_PIO_FALLBACK	= (1 << 19),

  	IDE_TFLAG_IN_HOB_FEATURE	= (1 << 20),
  	IDE_TFLAG_IN_HOB_NSECT		= (1 << 21),
  	IDE_TFLAG_IN_HOB_LBAL		= (1 << 22),
  	IDE_TFLAG_IN_HOB_LBAM		= (1 << 23),
  	IDE_TFLAG_IN_HOB_LBAH		= (1 << 24),
  	IDE_TFLAG_IN_HOB_LBA		= IDE_TFLAG_IN_HOB_LBAL |
  					  IDE_TFLAG_IN_HOB_LBAM |
  					  IDE_TFLAG_IN_HOB_LBAH,
  	IDE_TFLAG_IN_HOB		= IDE_TFLAG_IN_HOB_FEATURE |
  					  IDE_TFLAG_IN_HOB_NSECT |
  					  IDE_TFLAG_IN_HOB_LBA,

  	IDE_TFLAG_IN_FEATURE		= (1 << 1),

  	IDE_TFLAG_IN_NSECT		= (1 << 25),
  	IDE_TFLAG_IN_LBAL		= (1 << 26),
  	IDE_TFLAG_IN_LBAM		= (1 << 27),
  	IDE_TFLAG_IN_LBAH		= (1 << 28),
  	IDE_TFLAG_IN_LBA		= IDE_TFLAG_IN_LBAL |
  					  IDE_TFLAG_IN_LBAM |
  					  IDE_TFLAG_IN_LBAH,
  	IDE_TFLAG_IN_TF			= IDE_TFLAG_IN_NSECT |
  					  IDE_TFLAG_IN_LBA,
  	IDE_TFLAG_IN_DEVICE		= (1 << 29),

  	IDE_TFLAG_HOB			= IDE_TFLAG_OUT_HOB |
  					  IDE_TFLAG_IN_HOB,
  	IDE_TFLAG_TF			= IDE_TFLAG_OUT_TF |
  					  IDE_TFLAG_IN_TF,
  	IDE_TFLAG_DEVICE		= IDE_TFLAG_OUT_DEVICE |
  					  IDE_TFLAG_IN_DEVICE,

  	/* force 16-bit I/O operations */
  	IDE_TFLAG_IO_16BIT		= (1 << 30),

  	/* ide_task_t was allocated using kmalloc() */
  	IDE_TFLAG_DYN			= (1 << 31),

  };

  struct ide_taskfile {
  	u8	hob_data;	/*  0: high data byte (for TASKFILE IOCTL) */
  
  	u8	hob_feature;	/*  1-5: additional data to support LBA48 */
  	u8	hob_nsect;
  	u8	hob_lbal;
  	u8	hob_lbam;
  	u8	hob_lbah;
  
  	u8	data;		/*  6: low data byte (for TASKFILE IOCTL) */
  
  	union {			/*  7: */
  		u8 error;	/*   read:  error */
  		u8 feature;	/*  write: feature */
  	};
  
  	u8	nsect;		/*  8: number of sectors */
  	u8	lbal;		/*  9: LBA low */
  	u8	lbam;		/* 10: LBA mid */
  	u8	lbah;		/* 11: LBA high */
  
  	u8	device;		/* 12: device select */
  
  	union {			/* 13: */
  		u8 status;	/*  read: status  */
  		u8 command;	/* write: command */
  	};
  };

  typedef struct ide_task_s {

  	union {
  		struct ide_taskfile	tf;
  		u8			tf_array[14];
  	};

  	u32			tf_flags;

  	int			data_phase;

  	struct request		*rq;		/* copy of request */
  	void			*special;	/* valid_t generally */
  } ide_task_t;

  void ide_tf_dump(const char *, struct ide_taskfile *);

  void ide_exec_command(ide_hwif_t *, u8);
  u8 ide_read_status(ide_hwif_t *);
  u8 ide_read_altstatus(ide_hwif_t *);
  u8 ide_read_sff_dma_status(ide_hwif_t *);
  
  void ide_set_irq(ide_hwif_t *, int);
  
  void ide_tf_load(ide_drive_t *, ide_task_t *);
  void ide_tf_read(ide_drive_t *, ide_task_t *);
  
  void ide_input_data(ide_drive_t *, struct request *, void *, unsigned int);
  void ide_output_data(ide_drive_t *, struct request *, void *, unsigned int);

  int ide_io_buffers(ide_drive_t *, struct ide_atapi_pc *, unsigned int, int);

  extern void SELECT_DRIVE(ide_drive_t *);

  void SELECT_MASK(ide_drive_t *, int);

  u8 ide_read_error(ide_drive_t *);

  void ide_read_bcount_and_ireason(ide_drive_t *, u16 *, u8 *);

  extern int drive_is_ready(ide_drive_t *);

  void ide_pktcmd_tf_load(ide_drive_t *, u32, u16, u8);

  int ide_check_atapi_device(ide_drive_t *, const char *);

  void ide_init_pc(struct ide_atapi_pc *);

  /*
   * Special requests for ide-tape block device strategy routine.
   *
   * In order to service a character device command, we add special requests to
   * the tail of our block device request queue and wait for their completion.
   */
  enum {
  	REQ_IDETAPE_PC1		= (1 << 0), /* packet command (first stage) */
  	REQ_IDETAPE_PC2		= (1 << 1), /* packet command (second stage) */
  	REQ_IDETAPE_READ	= (1 << 2),
  	REQ_IDETAPE_WRITE	= (1 << 3),
  };
  
  void ide_queue_pc_head(ide_drive_t *, struct gendisk *, struct ide_atapi_pc *,
  		       struct request *);

  int ide_queue_pc_tail(ide_drive_t *, struct gendisk *, struct ide_atapi_pc *);

  int ide_set_media_lock(ide_drive_t *, struct gendisk *, int);

  ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
  	ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
  	void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
  	void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),

  	int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,

  			   int));

  ide_startstop_t ide_transfer_pc(ide_drive_t *, struct ide_atapi_pc *,
  				ide_handler_t *, unsigned int, ide_expiry_t *);

  ide_startstop_t ide_issue_pc(ide_drive_t *, struct ide_atapi_pc *,
  			     ide_handler_t *, unsigned int, ide_expiry_t *);

  ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);

  void task_end_request(ide_drive_t *, struct request *, u8);

  int ide_raw_taskfile(ide_drive_t *, ide_task_t *, u8 *, u16);

  int ide_no_data_taskfile(ide_drive_t *, ide_task_t *);

  int ide_taskfile_ioctl(ide_drive_t *, unsigned int, unsigned long);

  extern int ide_driveid_update(ide_drive_t *);

  extern int ide_config_drive_speed(ide_drive_t *, u8);
  extern u8 eighty_ninty_three (ide_drive_t *);

  extern int taskfile_lib_get_identify(ide_drive_t *drive, u8 *);
  
  extern int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout);

  extern void ide_stall_queue(ide_drive_t *drive, unsigned long timeout);
  
  extern int ide_spin_wait_hwgroup(ide_drive_t *);
  extern void ide_timer_expiry(unsigned long);

  extern irqreturn_t ide_intr(int irq, void *dev_id);

  extern void do_ide_request(struct request_queue *);

  
  void ide_init_disk(struct gendisk *, ide_drive_t *);

  #ifdef CONFIG_IDEPCI_PCIBUS_ORDER

  extern int __ide_pci_register_driver(struct pci_driver *driver, struct module *owner, const char *mod_name);
  #define ide_pci_register_driver(d) __ide_pci_register_driver(d, THIS_MODULE, KBUILD_MODNAME)

  #else
  #define ide_pci_register_driver(d) pci_register_driver(d)
  #endif

  void ide_pci_setup_ports(struct pci_dev *, const struct ide_port_info *, int,

  			 hw_regs_t *, hw_regs_t **);

  void ide_setup_pci_noise(struct pci_dev *, const struct ide_port_info *);

  #ifdef CONFIG_BLK_DEV_IDEDMA_PCI

  int ide_pci_set_master(struct pci_dev *, const char *);
  unsigned long ide_pci_dma_base(ide_hwif_t *, const struct ide_port_info *);

  int ide_pci_check_simplex(ide_hwif_t *, const struct ide_port_info *);

  int ide_hwif_setup_dma(ide_hwif_t *, const struct ide_port_info *);

  #else

  static inline int ide_hwif_setup_dma(ide_hwif_t *hwif,
  				     const struct ide_port_info *d)
  {
  	return -EINVAL;
  }

  #endif

  typedef struct ide_pci_enablebit_s {
  	u8	reg;	/* byte pci reg holding the enable-bit */
  	u8	mask;	/* mask to isolate the enable-bit */
  	u8	val;	/* value of masked reg when "enabled" */
  } ide_pci_enablebit_t;
  
  enum {
  	/* Uses ISA control ports not PCI ones. */

  	IDE_HFLAG_ISA_PORTS		= (1 << 0),

  	/* single port device */

  	IDE_HFLAG_SINGLE		= (1 << 1),

  	/* don't use legacy PIO blacklist */
  	IDE_HFLAG_PIO_NO_BLACKLIST	= (1 << 2),

  	/* set for the second port of QD65xx */
  	IDE_HFLAG_QD_2ND_PORT		= (1 << 3),

  	/* use PIO8/9 for prefetch off/on */
  	IDE_HFLAG_ABUSE_PREFETCH	= (1 << 4),
  	/* use PIO6/7 for fast-devsel off/on */
  	IDE_HFLAG_ABUSE_FAST_DEVSEL	= (1 << 5),
  	/* use 100-102 and 200-202 PIO values to set DMA modes */
  	IDE_HFLAG_ABUSE_DMA_MODES	= (1 << 6),

  	/*
  	 * keep DMA setting when programming PIO mode, may be used only
  	 * for hosts which have separate PIO and DMA timings (ie. PMAC)
  	 */
  	IDE_HFLAG_SET_PIO_MODE_KEEP_DMA	= (1 << 7),

  	/* program host for the transfer mode after programming device */
  	IDE_HFLAG_POST_SET_MODE		= (1 << 8),
  	/* don't program host/device for the transfer mode ("smart" hosts) */
  	IDE_HFLAG_NO_SET_MODE		= (1 << 9),

  	/* trust BIOS for programming chipset/device for DMA */
  	IDE_HFLAG_TRUST_BIOS_FOR_DMA	= (1 << 10),

  	/* host is CS5510/CS5520 */
  	IDE_HFLAG_CS5520		= (1 << 11),

  	/* ATAPI DMA is unsupported */
  	IDE_HFLAG_NO_ATAPI_DMA		= (1 << 12),

  	/* set if host is a "non-bootable" controller */
  	IDE_HFLAG_NON_BOOTABLE		= (1 << 13),

  	/* host doesn't support DMA */
  	IDE_HFLAG_NO_DMA		= (1 << 14),
  	/* check if host is PCI IDE device before allowing DMA */
  	IDE_HFLAG_NO_AUTODMA		= (1 << 15),

  	/* host uses MMIO */
  	IDE_HFLAG_MMIO			= (1 << 16),

  	/* no LBA48 */
  	IDE_HFLAG_NO_LBA48		= (1 << 17),
  	/* no LBA48 DMA */
  	IDE_HFLAG_NO_LBA48_DMA		= (1 << 18),

  	/* data FIFO is cleared by an error */
  	IDE_HFLAG_ERROR_STOPS_FIFO	= (1 << 19),

  	/* serialize ports */
  	IDE_HFLAG_SERIALIZE		= (1 << 20),

  	/* use legacy IRQs */
  	IDE_HFLAG_LEGACY_IRQS		= (1 << 21),

  	/* force use of legacy IRQs */
  	IDE_HFLAG_FORCE_LEGACY_IRQS	= (1 << 22),

  	/* limit LBA48 requests to 256 sectors */
  	IDE_HFLAG_RQSIZE_256		= (1 << 23),

  	/* use 32-bit I/O ops */
  	IDE_HFLAG_IO_32BIT		= (1 << 24),
  	/* unmask IRQs */
  	IDE_HFLAG_UNMASK_IRQS		= (1 << 25),

  	/* serialize ports if DMA is possible (for sl82c105) */
  	IDE_HFLAG_SERIALIZE_DMA		= (1 << 27),

  	/* force host out of "simplex" mode */
  	IDE_HFLAG_CLEAR_SIMPLEX		= (1 << 28),

  	/* DSC overlap is unsupported */
  	IDE_HFLAG_NO_DSC		= (1 << 29),

  	/* never use 32-bit I/O ops */
  	IDE_HFLAG_NO_IO_32BIT		= (1 << 30),
  	/* never unmask IRQs */
  	IDE_HFLAG_NO_UNMASK_IRQS	= (1 << 31),

  };

  #ifdef CONFIG_BLK_DEV_OFFBOARD

  # define IDE_HFLAG_OFF_BOARD	0

  #else
  # define IDE_HFLAG_OFF_BOARD	IDE_HFLAG_NON_BOOTABLE

  #endif

  struct ide_port_info {

  	char			*name;

  	unsigned int		(*init_chipset)(struct pci_dev *);

  	void			(*init_iops)(ide_hwif_t *);
  	void                    (*init_hwif)(ide_hwif_t *);

  	int			(*init_dma)(ide_hwif_t *,
  					    const struct ide_port_info *);

  	const struct ide_tp_ops		*tp_ops;

  	const struct ide_port_ops	*port_ops;

  	const struct ide_dma_ops	*dma_ops;

  	ide_pci_enablebit_t	enablebits[2];

  	hwif_chipset_t		chipset;

  	u32			host_flags;

  	u8			pio_mask;

  	u8			swdma_mask;
  	u8			mwdma_mask;

  	u8			udma_mask;

  };

  int ide_pci_init_one(struct pci_dev *, const struct ide_port_info *, void *);
  int ide_pci_init_two(struct pci_dev *, struct pci_dev *,
  		     const struct ide_port_info *, void *);

  void ide_pci_remove(struct pci_dev *);

  #ifdef CONFIG_PM
  int ide_pci_suspend(struct pci_dev *, pm_message_t);
  int ide_pci_resume(struct pci_dev *);
  #else
  #define ide_pci_suspend NULL
  #define ide_pci_resume NULL
  #endif

  void ide_map_sg(ide_drive_t *, struct request *);
  void ide_init_sg_cmd(ide_drive_t *, struct request *);
  
  #define BAD_DMA_DRIVE		0
  #define GOOD_DMA_DRIVE		1

  struct drive_list_entry {
  	const char *id_model;
  	const char *id_firmware;
  };

  int ide_in_drive_list(u16 *, const struct drive_list_entry *);

  
  #ifdef CONFIG_BLK_DEV_IDEDMA

  int __ide_dma_bad_drive(ide_drive_t *);

  int ide_id_dma_bug(ide_drive_t *);

  
  u8 ide_find_dma_mode(ide_drive_t *, u8);
  
  static inline u8 ide_max_dma_mode(ide_drive_t *drive)
  {
  	return ide_find_dma_mode(drive, XFER_UDMA_6);
  }

  void ide_dma_off_quietly(ide_drive_t *);

  void ide_dma_off(ide_drive_t *);

  void ide_dma_on(ide_drive_t *);

  int ide_set_dma(ide_drive_t *);

  void ide_check_dma_crc(ide_drive_t *);

  ide_startstop_t ide_dma_intr(ide_drive_t *);

  int ide_build_sglist(ide_drive_t *, struct request *);
  void ide_destroy_dmatable(ide_drive_t *);

  #ifdef CONFIG_BLK_DEV_IDEDMA_SFF

  extern int ide_build_dmatable(ide_drive_t *, struct request *);

  int ide_allocate_dma_engine(ide_hwif_t *);
  void ide_release_dma_engine(ide_hwif_t *);

  void ide_dma_host_set(ide_drive_t *, int);

  extern int ide_dma_setup(ide_drive_t *);

  void ide_dma_exec_cmd(ide_drive_t *, u8);

  extern void ide_dma_start(ide_drive_t *);
  extern int __ide_dma_end(ide_drive_t *);

  int ide_dma_test_irq(ide_drive_t *);

  extern void ide_dma_lost_irq(ide_drive_t *);

  extern void ide_dma_timeout(ide_drive_t *);

  extern const struct ide_dma_ops sff_dma_ops;

  #endif /* CONFIG_BLK_DEV_IDEDMA_SFF */

  
  #else

  static inline int ide_id_dma_bug(ide_drive_t *drive) { return 0; }

  static inline u8 ide_find_dma_mode(ide_drive_t *drive, u8 speed) { return 0; }

  static inline u8 ide_max_dma_mode(ide_drive_t *drive) { return 0; }

  static inline void ide_dma_off_quietly(ide_drive_t *drive) { ; }

  static inline void ide_dma_off(ide_drive_t *drive) { ; }

  static inline void ide_dma_on(ide_drive_t *drive) { ; }

  static inline void ide_dma_verbose(ide_drive_t *drive) { ; }

  static inline int ide_set_dma(ide_drive_t *drive) { return 1; }

  static inline void ide_check_dma_crc(ide_drive_t *drive) { ; }

  #endif /* CONFIG_BLK_DEV_IDEDMA */

  #ifndef CONFIG_BLK_DEV_IDEDMA_SFF

  static inline void ide_release_dma_engine(ide_hwif_t *hwif) { ; }

  #endif

  #ifdef CONFIG_BLK_DEV_IDEACPI
  extern int ide_acpi_exec_tfs(ide_drive_t *drive);
  extern void ide_acpi_get_timing(ide_hwif_t *hwif);
  extern void ide_acpi_push_timing(ide_hwif_t *hwif);
  extern void ide_acpi_init(ide_hwif_t *hwif);

  void ide_acpi_port_init_devices(ide_hwif_t *);

  extern void ide_acpi_set_state(ide_hwif_t *hwif, int on);

  #else
  static inline int ide_acpi_exec_tfs(ide_drive_t *drive) { return 0; }
  static inline void ide_acpi_get_timing(ide_hwif_t *hwif) { ; }
  static inline void ide_acpi_push_timing(ide_hwif_t *hwif) { ; }
  static inline void ide_acpi_init(ide_hwif_t *hwif) { ; }

  static inline void ide_acpi_port_init_devices(ide_hwif_t *hwif) { ; }

  static inline void ide_acpi_set_state(ide_hwif_t *hwif, int on) {}

  #endif

  void ide_remove_port_from_hwgroup(ide_hwif_t *);

  void ide_unregister(ide_hwif_t *);

  
  void ide_register_region(struct gendisk *);
  void ide_unregister_region(struct gendisk *);

  void ide_undecoded_slave(ide_drive_t *);

  void ide_port_apply_params(ide_hwif_t *);

  struct ide_host *ide_host_alloc_all(const struct ide_port_info *, hw_regs_t **);
  struct ide_host *ide_host_alloc(const struct ide_port_info *, hw_regs_t **);

  void ide_host_free(struct ide_host *);

  int ide_host_register(struct ide_host *, const struct ide_port_info *,
  		      hw_regs_t **);

  int ide_host_add(const struct ide_port_info *, hw_regs_t **,
  		 struct ide_host **);

  void ide_host_remove(struct ide_host *);

  int ide_legacy_device_add(const struct ide_port_info *, unsigned long);

  void ide_port_unregister_devices(ide_hwif_t *);
  void ide_port_scan(ide_hwif_t *);

  
  static inline void *ide_get_hwifdata (ide_hwif_t * hwif)
  {
  	return hwif->hwif_data;
  }
  
  static inline void ide_set_hwifdata (ide_hwif_t * hwif, void *data)
  {
  	hwif->hwif_data = data;
  }

  const char *ide_xfer_verbose(u8 mode);

  extern void ide_toggle_bounce(ide_drive_t *drive, int on);
  extern int ide_set_xfer_rate(ide_drive_t *drive, u8 rate);

  u64 ide_get_lba_addr(struct ide_taskfile *, int);

  u8 ide_dump_status(ide_drive_t *, const char *, u8);

  struct ide_timing {
  	u8  mode;
  	u8  setup;	/* t1 */
  	u16 act8b;	/* t2 for 8-bit io */
  	u16 rec8b;	/* t2i for 8-bit io */
  	u16 cyc8b;	/* t0 for 8-bit io */
  	u16 active;	/* t2 or tD */
  	u16 recover;	/* t2i or tK */
  	u16 cycle;	/* t0 */
  	u16 udma;	/* t2CYCTYP/2 */
  };
  
  enum {
  	IDE_TIMING_SETUP	= (1 << 0),
  	IDE_TIMING_ACT8B	= (1 << 1),
  	IDE_TIMING_REC8B	= (1 << 2),
  	IDE_TIMING_CYC8B	= (1 << 3),
  	IDE_TIMING_8BIT		= IDE_TIMING_ACT8B | IDE_TIMING_REC8B |
  				  IDE_TIMING_CYC8B,
  	IDE_TIMING_ACTIVE	= (1 << 4),
  	IDE_TIMING_RECOVER	= (1 << 5),
  	IDE_TIMING_CYCLE	= (1 << 6),
  	IDE_TIMING_UDMA		= (1 << 7),
  	IDE_TIMING_ALL		= IDE_TIMING_SETUP | IDE_TIMING_8BIT |
  				  IDE_TIMING_ACTIVE | IDE_TIMING_RECOVER |
  				  IDE_TIMING_CYCLE | IDE_TIMING_UDMA,
  };

  struct ide_timing *ide_timing_find_mode(u8);

  u16 ide_pio_cycle_time(ide_drive_t *, u8);

  void ide_timing_merge(struct ide_timing *, struct ide_timing *,
  		      struct ide_timing *, unsigned int);
  int ide_timing_compute(ide_drive_t *, u8, struct ide_timing *, int, int);

  int ide_scan_pio_blacklist(char *);

  u8 ide_get_best_pio_mode(ide_drive_t *, u8, u8);

  int ide_set_pio_mode(ide_drive_t *, u8);
  int ide_set_dma_mode(ide_drive_t *, u8);

  void ide_set_pio(ide_drive_t *, u8);
  
  static inline void ide_set_max_pio(ide_drive_t *drive)
  {
  	ide_set_pio(drive, 255);
  }

  
  extern spinlock_t ide_lock;

  extern struct mutex ide_cfg_mtx;

  /*
   * Structure locking:
   *

   * ide_cfg_mtx and ide_lock together protect changes to

   * ide_hwif_t->{next,hwgroup}
   * ide_drive_t->next
   *
   * ide_hwgroup_t->busy: ide_lock
   * ide_hwgroup_t->hwif: ide_lock
   * ide_hwif_t->mate: constant, no locking
   * ide_drive_t->hwif: constant, no locking
   */

  #define local_irq_set(flags)	do { local_save_flags((flags)); local_irq_enable_in_hardirq(); } while (0)

  
  extern struct bus_type ide_bus_type;

  extern struct class *ide_port_class;

  static inline void ide_dump_identify(u8 *id)
  {
  	print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 2, id, 512, 0);
  }

  static inline int hwif_to_node(ide_hwif_t *hwif)
  {

  	return hwif->dev ? dev_to_node(hwif->dev) : -1;

  }

  static inline ide_drive_t *ide_get_pair_dev(ide_drive_t *drive)

  {

  	ide_drive_t *peer = &drive->hwif->drives[(drive->dn ^ 1) & 1];

  	return peer->present ? peer : NULL;

  }

  #endif /* _IDE_H */