ide: IORDY handling fixes

[mirror_ubuntu-bionic-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>
#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>

/* for request_sense */
#include <linux/cdrom.h>

#if defined(CONFIG_CRIS) || defined(CONFIG_FRV) || defined(CONFIG_MN10300)
# define SUPPORT_VLB_SYNC 0
#else
# define SUPPORT_VLB_SYNC 1
#endif

/*
 * Probably not wise to fiddle with these
 */
#define IDE_DEFAULT_MAX_FAILURES        1
#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 */

/* Error codes returned in rq->errors to the higher part of the driver. */
enum {
        IDE_DRV_ERROR_GENERAL   = 101,
        IDE_DRV_ERROR_FILEMARK  = 102,
        IDE_DRV_ERROR_EOD       = 103,
};

/*
 * 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

/*
 * Timeouts for various operations:
 */
enum {
        /* spec allows up to 20ms */
        WAIT_DRQ        = HZ / 10,      /* 100ms */
        /* some laptops are very slow */
        WAIT_READY      = 5 * HZ,       /* 5s */
        /* should be less than 3ms (?), if all ATAPI CD is closed at boot */
        WAIT_PIDENTIFY  = 10 * HZ,      /* 10s */
        /* worst case when spinning up */
        WAIT_WORSTCASE  = 30 * HZ,      /* 30s */
        /* maximum wait for an IRQ to happen */
        WAIT_CMD        = 10 * HZ,      /* 10s */
        /* Some drives require a longer IRQ timeout. */
        WAIT_FLOPPY_CMD = 50 * HZ,      /* 50s */
        /*
         * Some drives (for example, Seagate STT3401A Travan) require a very
         * long timeout, because they don't return an interrupt or clear their
         * BSY bit until after the command completes (even retension commands).
         */
        WAIT_TAPE_CMD   = 900 * HZ,     /* 900s */
        /* minimum sleep time */
        WAIT_MIN_SLEEP  = HZ / 50,      /* 20ms */
};

/*
 * 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
#define REQ_DEVSET_EXEC         0x21
#define REQ_PARK_HEADS          0x22
#define REQ_UNPARK_HEADS        0x23

/*
 * 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_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
 */
struct ide_hw {
        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 */
        struct device   *dev, *parent;
        unsigned long   config;
};

static inline void ide_std_init_ports(struct ide_hw *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;
}

#define MAX_HWIFS       10

/*
 * 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
 */
enum {
        IDE_SFLAG_SET_GEOMETRY          = (1 << 0),
        IDE_SFLAG_RECALIBRATE           = (1 << 1),
        IDE_SFLAG_SET_MULTMODE          = (1 << 2),
};

/*
 * 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;

enum {
        IDE_VALID_ERROR                 = (1 << 1),
        IDE_VALID_FEATURE               = IDE_VALID_ERROR,
        IDE_VALID_NSECT                 = (1 << 2),
        IDE_VALID_LBAL                  = (1 << 3),
        IDE_VALID_LBAM                  = (1 << 4),
        IDE_VALID_LBAH                  = (1 << 5),
        IDE_VALID_DEVICE                = (1 << 6),
        IDE_VALID_LBA                   = IDE_VALID_LBAL |
                                          IDE_VALID_LBAM |
                                          IDE_VALID_LBAH,
        IDE_VALID_OUT_TF                = IDE_VALID_FEATURE |
                                          IDE_VALID_NSECT |
                                          IDE_VALID_LBA,
        IDE_VALID_IN_TF                 = IDE_VALID_NSECT |
                                          IDE_VALID_LBA,
        IDE_VALID_OUT_HOB               = IDE_VALID_OUT_TF,
        IDE_VALID_IN_HOB                = IDE_VALID_ERROR |
                                          IDE_VALID_NSECT |
                                          IDE_VALID_LBA,
};

enum {
        IDE_TFLAG_LBA48                 = (1 << 0),
        IDE_TFLAG_WRITE                 = (1 << 1),
        IDE_TFLAG_CUSTOM_HANDLER        = (1 << 2),
        IDE_TFLAG_DMA_PIO_FALLBACK      = (1 << 3),
        /* force 16-bit I/O operations */
        IDE_TFLAG_IO_16BIT              = (1 << 4),
        /* struct ide_cmd was allocated using kmalloc() */
        IDE_TFLAG_DYN                   = (1 << 5),
        IDE_TFLAG_FS                    = (1 << 6),
        IDE_TFLAG_MULTI_PIO             = (1 << 7),
};

enum {
        IDE_FTFLAG_FLAGGED              = (1 << 0),
        IDE_FTFLAG_SET_IN_FLAGS         = (1 << 1),
        IDE_FTFLAG_OUT_DATA             = (1 << 2),
        IDE_FTFLAG_IN_DATA              = (1 << 3),
};

struct ide_taskfile {
        u8      data;           /* 0: data byte (for TASKFILE ioctl) */
        union {                 /* 1: */
                u8 error;       /*  read: error */
                u8 feature;     /* write: feature */
        };
        u8      nsect;          /* 2: number of sectors */
        u8      lbal;           /* 3: LBA low */
        u8      lbam;           /* 4: LBA mid */
        u8      lbah;           /* 5: LBA high */
        u8      device;         /* 6: device select */
        union {                 /* 7: */
                u8 status;      /*  read: status */
                u8 command;     /* write: command */
        };
};

struct ide_cmd {
        struct ide_taskfile     tf;
        struct ide_taskfile     hob;
        struct {
                struct {
                        u8              tf;
                        u8              hob;
                } out, in;
        } valid;

        u8                      tf_flags;
        u8                      ftf_flags;      /* for TASKFILE ioctl */
        int                     protocol;

        int                     sg_nents;         /* number of sg entries */
        int                     orig_sg_nents;
        int                     sg_dma_direction; /* DMA transfer direction */

        unsigned int            nbytes;
        unsigned int            nleft;
        unsigned int            last_xfer_len;

        struct scatterlist      *cursg;
        unsigned int            cursg_ofs;

        struct request          *rq;            /* copy of request */
};

/* 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),
};

#define ATAPI_WAIT_PC           (60 * HZ)

struct ide_atapi_pc {
        /* actual packet bytes */
        u8 c[12];
        /* incremented on each retry */
        int retries;
        int error;

        /* bytes to transfer */
        int req_xfer;

        /* 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.
         */
        unsigned long timeout;
};

struct ide_devset;
struct ide_driver;

#ifdef CONFIG_BLK_DEV_IDEACPI
struct ide_acpi_drive_link;
struct ide_acpi_hwif_link;
#endif

struct ide_drive_s;

struct ide_disk_ops {
        int             (*check)(struct ide_drive_s *, const char *);
        int             (*get_capacity)(struct ide_drive_s *);
        u64             (*set_capacity)(struct ide_drive_s *, u64);
        void            (*setup)(struct ide_drive_s *);
        void            (*flush)(struct ide_drive_s *);
        int             (*init_media)(struct ide_drive_s *, struct gendisk *);
        int             (*set_doorlock)(struct ide_drive_s *, struct gendisk *,
                                        int);
        ide_startstop_t (*do_request)(struct ide_drive_s *, struct request *,
                                      sector_t);
        int             (*ioctl)(struct ide_drive_s *, struct block_device *,
                                 fmode_t, unsigned int, unsigned long);
};

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

        /* ide-cd */
        /* Drive cannot eject the disc. */
        IDE_AFLAG_NO_EJECT              = (1 << 1),
        /* Drive is a pre ATAPI 1.2 drive. */
        IDE_AFLAG_PRE_ATAPI12           = (1 << 2),
        /* TOC addresses are in BCD. */
        IDE_AFLAG_TOCADDR_AS_BCD        = (1 << 3),
        /* TOC track numbers are in BCD. */
        IDE_AFLAG_TOCTRACKS_AS_BCD      = (1 << 4),
        /* Saved TOC information is current. */
        IDE_AFLAG_TOC_VALID             = (1 << 6),
        /* We think that the drive door is locked. */
        IDE_AFLAG_DOOR_LOCKED           = (1 << 7),
        /* SET_CD_SPEED command is unsupported. */
        IDE_AFLAG_NO_SPEED_SELECT       = (1 << 8),
        IDE_AFLAG_VERTOS_300_SSD        = (1 << 9),
        IDE_AFLAG_VERTOS_600_ESD        = (1 << 10),
        IDE_AFLAG_SANYO_3CD             = (1 << 11),
        IDE_AFLAG_FULL_CAPS_PAGE        = (1 << 12),
        IDE_AFLAG_PLAY_AUDIO_OK         = (1 << 13),
        IDE_AFLAG_LE_SPEED_FIELDS       = (1 << 14),

        /* ide-floppy */
        /* Avoid commands not supported in Clik drive */
        IDE_AFLAG_CLIK_DRIVE            = (1 << 15),
        /* Requires BH algorithm for packets */
        IDE_AFLAG_ZIP_DRIVE             = (1 << 16),
        /* Supports format progress report */
        IDE_AFLAG_SRFP                  = (1 << 17),

        /* ide-tape */
        IDE_AFLAG_IGNORE_DSC            = (1 << 18),
        /* 0 When the tape position is unknown */
        IDE_AFLAG_ADDRESS_VALID         = (1 << 19),
        /* Device already opened */
        IDE_AFLAG_BUSY                  = (1 << 20),
        /* Attempt to auto-detect the current user block size */
        IDE_AFLAG_DETECT_BS             = (1 << 21),
        /* Currently on a filemark */
        IDE_AFLAG_FILEMARK              = (1 << 22),
        /* 0 = no tape is loaded, so we don't rewind after ejecting */
        IDE_AFLAG_MEDIUM_PRESENT        = (1 << 23),

        IDE_AFLAG_NO_AUTOCLOSE          = (1 << 24),
};

/* device flags */
enum {
        /* restore settings after device reset */
        IDE_DFLAG_KEEP_SETTINGS         = (1 << 0),
        /* device is using DMA for read/write */
        IDE_DFLAG_USING_DMA             = (1 << 1),
        /* okay to unmask other IRQs */
        IDE_DFLAG_UNMASK                = (1 << 2),
        /* don't attempt flushes */
        IDE_DFLAG_NOFLUSH               = (1 << 3),
        /* DSC overlap */
        IDE_DFLAG_DSC_OVERLAP           = (1 << 4),
        /* give potential excess bandwidth */
        IDE_DFLAG_NICE1                 = (1 << 5),
        /* device is physically present */
        IDE_DFLAG_PRESENT               = (1 << 6),
        /* disable Host Protected Area */
        IDE_DFLAG_NOHPA                 = (1 << 7),
        /* id read from device (synthetic if not set) */
        IDE_DFLAG_ID_READ               = (1 << 8),
        IDE_DFLAG_NOPROBE               = (1 << 9),
        /* need to do check_media_change() */
        IDE_DFLAG_REMOVABLE             = (1 << 10),
        /* needed for removable devices */
        IDE_DFLAG_ATTACH                = (1 << 11),
        IDE_DFLAG_FORCED_GEOM           = (1 << 12),
        /* disallow setting unmask bit */
        IDE_DFLAG_NO_UNMASK             = (1 << 13),
        /* disallow enabling 32-bit I/O */
        IDE_DFLAG_NO_IO_32BIT           = (1 << 14),
        /* for removable only: door lock/unlock works */
        IDE_DFLAG_DOORLOCKING           = (1 << 15),
        /* disallow DMA */
        IDE_DFLAG_NODMA                 = (1 << 16),
        /* powermanagment told us not to do anything, so sleep nicely */
        IDE_DFLAG_BLOCKED               = (1 << 17),
        /* sleeping & sleep field valid */
        IDE_DFLAG_SLEEPING              = (1 << 18),
        IDE_DFLAG_POST_RESET            = (1 << 19),
        IDE_DFLAG_UDMA33_WARNED         = (1 << 20),
        IDE_DFLAG_LBA48                 = (1 << 21),
        /* status of write cache */
        IDE_DFLAG_WCACHE                = (1 << 22),
        /* used for ignoring ATA_DF */
        IDE_DFLAG_NOWERR                = (1 << 23),
        /* retrying in PIO */
        IDE_DFLAG_DMA_PIO_RETRY         = (1 << 24),
        IDE_DFLAG_LBA                   = (1 << 25),
        /* don't unload heads */
        IDE_DFLAG_NO_UNLOAD             = (1 << 26),
        /* heads unloaded, please don't reset port */
        IDE_DFLAG_PARKED                = (1 << 27),
        IDE_DFLAG_MEDIA_CHANGED         = (1 << 28),
        /* write protect */
        IDE_DFLAG_WP                    = (1 << 29),
        IDE_DFLAG_FORMAT_IN_PROGRESS    = (1 << 30),
        IDE_DFLAG_NIEN_QUIRK            = (1 << 31),
};

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 */
        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_proc_devset *settings; /* /proc/ide/ drive settings */
#endif
        struct hwif_s           *hwif;  /* actually (ide_hwif_t *) */

        const struct ide_disk_ops *disk_ops;

        unsigned long dev_flags;

        unsigned long sleep;            /* sleep until this time */
        unsigned long timeout;          /* max time to wait for irq */

        u8      special_flags;          /* special action flags */

        u8      select;                 /* basic drive/head select reg value */
        u8      retry_pio;              /* retrying dma capable host in pio */
        u8      waiting_for_dma;        /* dma currently in progress */
        u8      dma;                    /* atapi dma flag */

        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      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 */

        /* delay this long before sending packet command */
        u8 pc_delay;

        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/dev_select() */
        unsigned int    failures;       /* current failure count */
        unsigned int    max_failures;   /* maximum allowed failure count */
        u64             probed_capacity;/* initial/native media capacity */
        u64             capacity64;     /* total number of sectors */

        int             lun;            /* logical unit */
        int             crc_count;      /* crc counter to reduce drive speed */

        unsigned long   debug_mask;     /* debugging levels switch */

#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() */

        /* current packet command */
        struct ide_atapi_pc *pc;

        /* last failed packet command */
        struct ide_atapi_pc *failed_pc;

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

        ide_startstop_t (*irq_handler)(struct ide_drive_s *);

        unsigned long atapi_flags;

        struct ide_atapi_pc request_sense_pc;

        /* current sense rq and buffer */
        bool sense_rq_armed;
        struct request sense_rq;
        struct request_sense sense_data;
};

typedef struct ide_drive_s ide_drive_t;

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

#define to_ide_drv(obj, cont_type)      \
        container_of(obj, struct cont_type, dev)

#define ide_drv_g(disk, cont_type)      \
        container_of((disk)->private_data, struct cont_type, driver)

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 *);
        void    (*write_devctl)(struct hwif_s *, u8);

        void    (*dev_select)(ide_drive_t *);
        void    (*tf_load)(ide_drive_t *, struct ide_taskfile *, u8);
        void    (*tf_read)(ide_drive_t *, struct ide_taskfile *, u8);

        void    (*input_data)(ide_drive_t *, struct ide_cmd *,
                              void *, unsigned int);
        void    (*output_data)(ide_drive_t *, struct ide_cmd *,
                               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
 * @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
 * @clear_irq:          clear IRQ
 *
 * @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);
        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 *);
        void    (*clear_irq)(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 *, struct ide_cmd *);
        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 *);
        /* below ones are optional */
        int     (*dma_check)(struct ide_drive_s *, struct ide_cmd *);
        int     (*dma_timer_expiry)(struct ide_drive_s *);
        void    (*dma_clear)(struct ide_drive_s *);
        /*
         * The following method is optional and only required to be
         * implemented for the SFF-8038i compatible controllers.
         */
        u8      (*dma_sff_read_status)(struct hwif_s *);
};

struct ide_host;

typedef struct hwif_s {
        struct hwif_s *mate;            /* other hwif from same PCI chip */
        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     *devices[MAX_DRIVES + 1];

        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;

        /* dma physical region descriptor table (cpu view) */
        unsigned int    *dmatable_cpu;
        /* dma physical region descriptor table (dma view) */
        dma_addr_t      dmatable_dma;

        /* maximum number of PRD table entries */
        int prd_max_nents;
        /* PRD entry size in bytes */
        int prd_ent_size;

        /* Scatter-gather list used to build the above */
        struct scatterlist *sg_table;
        int sg_max_nents;               /* Maximum number of entries in it */

        struct ide_cmd cmd;             /* current command */

        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        busy       : 1; /* serializes devices on a port */

        struct device           gendev;
        struct device           *portdev;

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

        void            *hwif_data;     /* extra hwif data */

#ifdef CONFIG_BLK_DEV_IDEACPI
        struct ide_acpi_hwif_link *acpidata;
#endif

        /* IRQ handler, if active */
        ide_startstop_t (*handler)(ide_drive_t *);

        /* BOOL: polling active & poll_timeout field valid */
        unsigned int polling : 1;

        /* current drive */
        ide_drive_t *cur_dev;

        /* 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;

        spinlock_t lock;
} ____cacheline_internodealigned_in_smp ide_hwif_t;

#define MAX_HOST_PORTS 4

struct ide_host {
        ide_hwif_t      *ports[MAX_HOST_PORTS + 1];
        unsigned int    n_ports;
        struct device   *dev[2];

        int             (*init_chipset)(struct pci_dev *);

        void            (*get_lock)(irq_handler_t, void *);
        void            (*release_lock)(void);

        irq_handler_t   irq_handler;

        unsigned long   host_flags;

        int             irq_flags;

        void            *host_priv;
        ide_hwif_t      *cur_port;      /* for hosts requiring serialization */

        /* used for hosts requiring serialization */
        volatile unsigned long  host_busy;
};

#define IDE_HOST_BUSY 0

/*
 *  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 ide_cmd *, void *, unsigned);

extern struct mutex ide_setting_mtx;

/*
 * configurable drive settings
 */

#define DS_SYNC (1 << 0)

struct ide_devset {
        int             (*get)(ide_drive_t *);
        int             (*set)(ide_drive_t *, int);
        unsigned int    flags;
};

#define __DEVSET(_flags, _get, _set) { \
        .flags  = _flags, \
        .get    = _get, \
        .set    = _set, \
}

#define ide_devset_get(name, field) \
static int get_##name(ide_drive_t *drive) \
{ \
        return drive->field; \
}

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

#define ide_devset_get_flag(name, flag) \
static int get_##name(ide_drive_t *drive) \
{ \
        return !!(drive->dev_flags & flag); \
}

#define ide_devset_set_flag(name, flag) \
static int set_##name(ide_drive_t *drive, int arg) \
{ \
        if (arg) \
                drive->dev_flags |= flag; \
        else \
                drive->dev_flags &= ~flag; \
        return 0; \
}

#define __IDE_DEVSET(_name, _flags, _get, _set) \
const struct ide_devset ide_devset_##_name = \
        __DEVSET(_flags, _get, _set)

#define IDE_DEVSET(_name, _flags, _get, _set) \
static __IDE_DEVSET(_name, _flags, _get, _set)

#define ide_devset_rw(_name, _func) \
IDE_DEVSET(_name, 0, get_##_func, set_##_func)

#define ide_devset_w(_name, _func) \
IDE_DEVSET(_name, 0, NULL, set_##_func)

#define ide_ext_devset_rw(_name, _func) \
__IDE_DEVSET(_name, 0, get_##_func, set_##_func)

#define ide_ext_devset_rw_sync(_name, _func) \
__IDE_DEVSET(_name, DS_SYNC, get_##_func, set_##_func)

#define ide_decl_devset(_name) \
extern const struct ide_devset ide_devset_##_name

ide_decl_devset(io_32bit);
ide_decl_devset(keepsettings);
ide_decl_devset(pio_mode);
ide_decl_devset(unmaskirq);
ide_decl_devset(using_dma);

#ifdef CONFIG_IDE_PROC_FS
/*
 * /proc/ide interface
 */

#define ide_devset_rw_field(_name, _field) \
ide_devset_get(_name, _field); \
ide_devset_set(_name, _field); \
IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)

#define ide_devset_rw_flag(_name, _field) \
ide_devset_get_flag(_name, _field); \
ide_devset_set_flag(_name, _field); \
IDE_DEVSET(_name, DS_SYNC, get_##_name, set_##_name)

struct ide_proc_devset {
        const char              *name;
        const struct ide_devset *setting;
        int                     min, max;
        int                     (*mulf)(ide_drive_t *);
        int                     (*divf)(ide_drive_t *);
};

#define __IDE_PROC_DEVSET(_name, _min, _max, _mulf, _divf) { \
        .name = __stringify(_name), \
        .setting = &ide_devset_##_name, \
        .min = _min, \
        .max = _max, \
        .mulf = _mulf, \
        .divf = _divf, \
}

#define IDE_PROC_DEVSET(_name, _min, _max) \
__IDE_PROC_DEVSET(_name, _min, _max, NULL, NULL)

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 *, struct ide_driver *);
void ide_proc_unregister_driver(ide_drive_t *, struct ide_driver *);

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,
                                            struct ide_driver *driver) { ; }
static inline void ide_proc_unregister_driver(ide_drive_t *drive,
                                              struct ide_driver *driver) { ; }
#define PROC_IDE_READ_RETURN(page,start,off,count,eof,len) return 0;
#endif

enum {
        /* enter/exit functions */
        IDE_DBG_FUNC =                  (1 << 0),
        /* sense key/asc handling */
        IDE_DBG_SENSE =                 (1 << 1),
        /* packet commands handling */
        IDE_DBG_PC =                    (1 << 2),
        /* request handling */
        IDE_DBG_RQ =                    (1 << 3),
        /* driver probing/setup */
        IDE_DBG_PROBE =                 (1 << 4),
};

/* DRV_NAME has to be defined in the driver before using the macro below */
#define __ide_debug_log(lvl, fmt, args...)                              \
{                                                                       \
        if (unlikely(drive->debug_mask & lvl))                          \
                printk(KERN_INFO DRV_NAME ": %s: " fmt "\n",            \
                                          __func__, ## args);           \
}

/*
 * Power Management state machine (rq->pm->pm_step).
 *
 * For each step, the core calls ide_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, ide_start_power_step() will issue a taskfile request with
 * do_rw_taskfile().
 *
 * Upon reception of the interrupt, the core will call ide_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
 * ide_start_power_step() for the new step value, unless step have been
 * set to IDE_PM_COMPLETED.
 */
enum {
        IDE_PM_START_SUSPEND,
        IDE_PM_FLUSH_CACHE      = IDE_PM_START_SUSPEND,
        IDE_PM_STANDBY,

        IDE_PM_START_RESUME,
        IDE_PM_RESTORE_PIO      = IDE_PM_START_RESUME,
        IDE_PM_IDLE,
        IDE_PM_RESTORE_DMA,

        IDE_PM_COMPLETED,
};

int generic_ide_suspend(struct device *, pm_message_t);
int generic_ide_resume(struct device *);

void ide_complete_power_step(ide_drive_t *, struct request *);
ide_startstop_t ide_start_power_step(ide_drive_t *, struct request *);
void ide_complete_pm_rq(ide_drive_t *, struct request *);
void ide_check_pm_state(ide_drive_t *, struct request *);

/*
 * 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 {
        const char                      *version;
        ide_startstop_t (*do_request)(ide_drive_t *, struct request *, sector_t);
        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_entries)(ide_drive_t *);
        const struct ide_proc_devset *  (*proc_devsets)(ide_drive_t *);
#endif
};

#define to_ide_driver(drv) container_of(drv, struct ide_driver, 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;
        const struct ide_devset *setting;
};

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 block_device *, unsigned, unsigned long);

extern int ide_vlb_clk;
extern int ide_pci_clk;

unsigned int ide_rq_bytes(struct request *);
int ide_end_rq(ide_drive_t *, struct request *, int, unsigned int);
void ide_kill_rq(ide_drive_t *, struct request *);

void __ide_set_handler(ide_drive_t *, ide_handler_t *, unsigned int);
void ide_set_handler(ide_drive_t *, ide_handler_t *, unsigned int);

void ide_execute_command(ide_drive_t *, struct ide_cmd *, ide_handler_t *,
                         unsigned int);

void ide_pad_transfer(ide_drive_t *, int, int);

ide_startstop_t ide_error(ide_drive_t *, const char *, u8);

void ide_fix_driveid(u16 *);

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

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

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

ide_startstop_t ide_do_park_unpark(ide_drive_t *, struct request *);
ide_startstop_t ide_do_devset(ide_drive_t *, struct request *);

extern ide_startstop_t ide_do_reset (ide_drive_t *);

extern int ide_devset_execute(ide_drive_t *drive,
                              const struct ide_devset *setting, int arg);

void ide_complete_cmd(ide_drive_t *, struct ide_cmd *, u8, u8);
int ide_complete_rq(ide_drive_t *, int, unsigned int);

void ide_tf_readback(ide_drive_t *drive, struct ide_cmd *cmd);
void ide_tf_dump(const char *, struct ide_cmd *);

void ide_exec_command(ide_hwif_t *, u8);
u8 ide_read_status(ide_hwif_t *);
u8 ide_read_altstatus(ide_hwif_t *);
void ide_write_devctl(ide_hwif_t *, u8);

void ide_dev_select(ide_drive_t *);
void ide_tf_load(ide_drive_t *, struct ide_taskfile *, u8);
void ide_tf_read(ide_drive_t *, struct ide_taskfile *, u8);

void ide_input_data(ide_drive_t *, struct ide_cmd *, void *, unsigned int);
void ide_output_data(ide_drive_t *, struct ide_cmd *, void *, unsigned int);

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 *);

int ide_check_ireason(ide_drive_t *, struct request *, int, int, int);

int ide_check_atapi_device(ide_drive_t *, const char *);

void ide_init_pc(struct ide_atapi_pc *);

/* Disk head parking */
extern wait_queue_head_t ide_park_wq;
ssize_t ide_park_show(struct device *dev, struct device_attribute *attr,
                      char *buf);
ssize_t ide_park_store(struct device *dev, struct device_attribute *attr,
                       const char *buf, size_t len);

/*
 * 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),
};

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

int ide_do_test_unit_ready(ide_drive_t *, struct gendisk *);
int ide_do_start_stop(ide_drive_t *, struct gendisk *, int);
int ide_set_media_lock(ide_drive_t *, struct gendisk *, int);
void ide_create_request_sense_cmd(ide_drive_t *, struct ide_atapi_pc *);
void ide_retry_pc(ide_drive_t *drive);

void ide_prep_sense(ide_drive_t *drive, struct request *rq);
int ide_queue_sense_rq(ide_drive_t *drive, void *special);

int ide_cd_expiry(ide_drive_t *);

int ide_cd_get_xferlen(struct request *);

ide_startstop_t ide_issue_pc(ide_drive_t *, struct ide_cmd *);

ide_startstop_t do_rw_taskfile(ide_drive_t *, struct ide_cmd *);

void ide_pio_bytes(ide_drive_t *, struct ide_cmd *, unsigned int, unsigned int);

void ide_finish_cmd(ide_drive_t *, struct ide_cmd *, u8);

int ide_raw_taskfile(ide_drive_t *, struct ide_cmd *, u8 *, u16);
int ide_no_data_taskfile(ide_drive_t *, struct ide_cmd *);

int ide_taskfile_ioctl(ide_drive_t *, unsigned long);

int ide_dev_read_id(ide_drive_t *, u8, u16 *);

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 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

static inline int ide_pci_is_in_compatibility_mode(struct pci_dev *dev)
{
        if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5)
                return 1;
        return 0;
}

void ide_pci_setup_ports(struct pci_dev *, const struct ide_port_info *,
                         struct ide_hw *, struct ide_hw **);
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

struct ide_pci_enablebit {
        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" */
};

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),
        /* host is DTC2278 */
        IDE_HFLAG_DTC2278               = (1 << 21),
        /* 4 devices on a single set of I/O ports */
        IDE_HFLAG_4DRIVES               = (1 << 22),
        /* host is TRM290 */
        IDE_HFLAG_TRM290                = (1 << 23),
        /* use 32-bit I/O ops */
        IDE_HFLAG_IO_32BIT              = (1 << 24),
        /* unmask IRQs */
        IDE_HFLAG_UNMASK_IRQS           = (1 << 25),
        IDE_HFLAG_BROKEN_ALTSTATUS      = (1 << 26),
        /* 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;

        int                     (*init_chipset)(struct pci_dev *);

        void                    (*get_lock)(irq_handler_t, void *);
        void                    (*release_lock)(void);

        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;

        struct ide_pci_enablebit        enablebits[2];

        hwif_chipset_t          chipset;

        u16                     max_sectors;    /* if < than the default one */

        u32                     host_flags;

        int                     irq_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 ide_cmd *);
void ide_init_sg_cmd(struct ide_cmd *, unsigned int);

#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_good_drive(ide_drive_t *);
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_allocate_dma_engine(ide_hwif_t *);
void ide_release_dma_engine(ide_hwif_t *);

int ide_dma_prepare(ide_drive_t *, struct ide_cmd *);
void ide_dma_unmap_sg(ide_drive_t *, struct ide_cmd *);

#ifdef CONFIG_BLK_DEV_IDEDMA_SFF
int config_drive_for_dma(ide_drive_t *);
int ide_build_dmatable(ide_drive_t *, struct ide_cmd *);
void ide_dma_host_set(ide_drive_t *, int);
int ide_dma_setup(ide_drive_t *, struct ide_cmd *);
extern void ide_dma_start(ide_drive_t *);
int ide_dma_end(ide_drive_t *);
int ide_dma_test_irq(ide_drive_t *);
int ide_dma_sff_timer_expiry(ide_drive_t *);
u8 ide_dma_sff_read_status(ide_hwif_t *);
extern const struct ide_dma_ops sff_dma_ops;
#else
static inline int config_drive_for_dma(ide_drive_t *drive) { return 0; }
#endif /* CONFIG_BLK_DEV_IDEDMA_SFF */

void ide_dma_lost_irq(ide_drive_t *);
ide_startstop_t ide_dma_timeout_retry(ide_drive_t *, int);

#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) { ; }
static inline ide_startstop_t ide_dma_intr(ide_drive_t *drive) { return ide_stopped; }
static inline ide_startstop_t ide_dma_timeout_retry(ide_drive_t *drive, int error) { return ide_stopped; }
static inline void ide_release_dma_engine(ide_hwif_t *hwif) { ; }
static inline int ide_dma_prepare(ide_drive_t *drive,
                                  struct ide_cmd *cmd) { return 1; }
static inline void ide_dma_unmap_sg(ide_drive_t *drive,
                                    struct ide_cmd *cmd) { ; }
#endif /* CONFIG_BLK_DEV_IDEDMA */

#ifdef CONFIG_BLK_DEV_IDEACPI
int ide_acpi_init(void);
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);
void ide_acpi_init_port(ide_hwif_t *);
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_init(void) { return 0; }
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_port(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_register_region(struct gendisk *);
void ide_unregister_region(struct gendisk *);

void ide_check_nien_quirk_list(ide_drive_t *);
void ide_undecoded_slave(ide_drive_t *);

void ide_port_apply_params(ide_hwif_t *);
int ide_sysfs_register_port(ide_hwif_t *);

struct ide_host *ide_host_alloc(const struct ide_port_info *, struct ide_hw **,
                                unsigned int);
void ide_host_free(struct ide_host *);
int ide_host_register(struct ide_host *, const struct ide_port_info *,
                      struct ide_hw **);
int ide_host_add(const struct ide_port_info *, struct ide_hw **, unsigned int,
                 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;
}

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

u64 ide_get_lba_addr(struct ide_cmd *, 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);

#ifdef CONFIG_IDE_XFER_MODE
int ide_scan_pio_blacklist(char *);
const char *ide_xfer_verbose(u8);
u8 ide_get_best_pio_mode(ide_drive_t *, u8, u8);
int ide_pio_need_iordy(ide_drive_t *, const 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);
int ide_set_xfer_rate(ide_drive_t *, u8);
#else
static inline void ide_set_pio(ide_drive_t *drive, u8 pio) { ; }
static inline int ide_set_xfer_rate(ide_drive_t *drive, u8 rate) { return -1; }
#endif

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

char *ide_media_string(ide_drive_t *);

extern struct device_attribute ide_dev_attrs[];
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->devices[(drive->dn ^ 1) & 1];

        return (peer->dev_flags & IDE_DFLAG_PRESENT) ? peer : NULL;
}

#define ide_port_for_each_dev(i, dev, port) \
        for ((i) = 0; ((dev) = (port)->devices[i]) || (i) < MAX_DRIVES; (i)++)

#define ide_port_for_each_present_dev(i, dev, port) \
        for ((i) = 0; ((dev) = (port)->devices[i]) || (i) < MAX_DRIVES; (i)++) \
                if ((dev)->dev_flags & IDE_DFLAG_PRESENT)

#define ide_host_for_each_port(i, port, host) \
        for ((i) = 0; ((port) = (host)->ports[i]) || (i) < MAX_HOST_PORTS; (i)++)

#endif /* _IDE_H */