ide: preparations for /proc/ide/hd*/settings rework

[mirror_ubuntu-artful-kernel.git] / include / linux / ide.h

#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>
#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 SECTOR_WORDS    (SECTOR_SIZE / 4)       /* number of 32bit words per sector */
#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_driver_s;
struct ide_settings_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),

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

        /* ide-tape */
        IDE_AFLAG_IGNORE_DSC            = (1 << 21),
        /* 0 When the tape position is unknown */
        IDE_AFLAG_ADDRESS_VALID         = (1 << 22),
        /* Device already opened */
        IDE_AFLAG_BUSY                  = (1 << 23),
        /* Attempt to auto-detect the current user block size */
        IDE_AFLAG_DETECT_BS             = (1 << 24),
        /* Currently on a filemark */
        IDE_AFLAG_FILEMARK              = (1 << 25),
        /* 0 = no tape is loaded, so we don't rewind after ejecting */
        IDE_AFLAG_MEDIUM_PRESENT        = (1 << 26),

        IDE_AFLAG_NO_AUTOCLOSE          = (1 << 27),
};

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 */
        struct ide_settings_s *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      keep_settings;          /* restore settings after drive reset */
        u8      using_dma;              /* disk is using dma for read/write */
        u8      retry_pio;              /* retrying dma capable host in pio */
        u8      state;                  /* retry state */
        u8      waiting_for_dma;        /* dma currently in progress */
        u8      unmask;                 /* okay to unmask other irqs */
        u8      noflush;                /* don't attempt flushes */
        u8      dsc_overlap;            /* DSC overlap */
        u8      nice1;                  /* 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 atapi_overlap  : 1;    /* ATAPI overlap (not supported) */
        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;

        u8      addressing;     /* 0=28-bit, 1=48-bit, 2=48-bit doing 28-bit */
        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      wcache;         /* status of write cache */
        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      nowerr;         /* 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 */
        u8 bus_state;   /* power state of the IDE bus */

        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 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 set_io_32bit(ide_drive_t *, int);
int set_ksettings(ide_drive_t *, int);
int set_pio_mode(ide_drive_t *, int);
int set_unmaskirq(ide_drive_t *, int);
int set_using_dma(ide_drive_t *, int);

/* 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),
};

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[256];

        /* 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 TYPE_INT        0
#define TYPE_BYTE       1
#define TYPE_SHORT      2

#define SETTING_READ    (1 << 0)
#define SETTING_WRITE   (1 << 1)
#define SETTING_RW      (SETTING_READ | SETTING_WRITE)

typedef int (ide_procset_t)(ide_drive_t *, int);
typedef struct ide_settings_s {
        char                    *name;
        int                     rw;
        int                     data_type;
        int                     min;
        int                     max;
        int                     mul_factor;
        int                     div_factor;
        void                    *data;
        ide_procset_t           *set;
        int                     auto_remove;
        struct ide_settings_s   *next;
} ide_settings_t;

int ide_add_setting(ide_drive_t *, const char *, int, int, int, int, int, int, void *, ide_procset_t *set);

/*
 * /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 *);

void ide_add_generic_settings(ide_drive_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) { ; }
static inline void ide_add_generic_settings(ide_drive_t *drive) { ; }
#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;
        unsigned supports_dsc_overlap   : 1;
        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;
#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 *);

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);

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);

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 *),
        void (*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);
int ide_cmd_ioctl(ide_drive_t *, unsigned int, unsigned long);
int ide_task_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 *);

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);

static inline int ide_dev_has_iordy(u16 *id)
{
        return ((id[ATA_ID_FIELD_VALID] & 2) && ata_id_has_iordy(id)) ? 1 : 0;
}

static inline int ide_dev_is_sata(u16 *id)
{
        /*
         * See if word 93 is 0 AND drive is at least ATA-5 compatible
         * verifying that word 80 by casting it to a signed type --
         * this trick allows us to filter out the reserved values of
         * 0x0000 and 0xffff along with the earlier ATA revisions...
         */
        if (id[ATA_ID_HW_CONFIG] == 0 && (short)id[ATA_ID_MAJOR_VER] >= 0x0020)
                return 1;
        return 0;
}

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;

/* check if CACHE FLUSH (EXT) command is supported (bits defined in ATA-6) */
#define ide_id_has_flush_cache(id)      ((id)[ATA_ID_CFS_ENABLE_2] & 0x3000)

/* some Maxtor disks have bit 13 defined incorrectly so check bit 10 too */
#define ide_id_has_flush_cache_ext(id)  \
        (((id)[ATA_ID_CFS_ENABLE_2] & 0x2400) == 0x2400)

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 */