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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/hdreg.h>
#include <linux/hdsmart.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/semaphore.h>
#include <asm/mutex.h>

/******************************************************************************
 * IDE driver configuration options (play with these as desired):
 *
 * REALLY_SLOW_IO can be defined in ide.c and ide-cd.c, if necessary
 */
#define INITIAL_MULT_COUNT    0     /* off=0; on=2,4,8,16,32, etc.. */

#ifndef SUPPORT_SLOW_DATA_PORTS           /* 1 to support slow data ports */
#define SUPPORT_SLOW_DATA_PORTS     1     /* 0 to reduce kernel size */
#endif
#ifndef SUPPORT_VLB_SYNC            /* 1 to support weird 32-bit chips */
#define SUPPORT_VLB_SYNC      1     /* 0 to reduce kernel size */
#endif
#ifndef OK_TO_RESET_CONTROLLER            /* 1 needed for good error recovery */
#define OK_TO_RESET_CONTROLLER      1     /* 0 for use with AH2372A/B interface */
#endif

#ifndef DISABLE_IRQ_NOSYNC
#define DISABLE_IRQ_NOSYNC    0
#endif

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

/*
 *  "No user-serviceable parts" beyond this point  :)
 *****************************************************************************/

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 */

/*
 * Tune flags
 */
#define IDE_TUNE_NOAUTO       2
#define IDE_TUNE_AUTO         1
#define IDE_TUNE_DEFAULT      0

/*
 * 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)

#define IDE_DATA_OFFSET       (0)
#define IDE_ERROR_OFFSET      (1)
#define IDE_NSECTOR_OFFSET    (2)
#define IDE_SECTOR_OFFSET     (3)
#define IDE_LCYL_OFFSET       (4)
#define IDE_HCYL_OFFSET       (5)
#define IDE_SELECT_OFFSET     (6)
#define IDE_STATUS_OFFSET     (7)
#define IDE_CONTROL_OFFSET    (8)
#define IDE_IRQ_OFFSET        (9)

#define IDE_FEATURE_OFFSET    IDE_ERROR_OFFSET
#define IDE_COMMAND_OFFSET    IDE_STATUS_OFFSET

#define IDE_CONTROL_OFFSET_HOB      (7)

#define IDE_DATA_REG          (HWIF(drive)->io_ports[IDE_DATA_OFFSET])
#define IDE_ERROR_REG         (HWIF(drive)->io_ports[IDE_ERROR_OFFSET])
#define IDE_NSECTOR_REG       (HWIF(drive)->io_ports[IDE_NSECTOR_OFFSET])
#define IDE_SECTOR_REG        (HWIF(drive)->io_ports[IDE_SECTOR_OFFSET])
#define IDE_LCYL_REG          (HWIF(drive)->io_ports[IDE_LCYL_OFFSET])
#define IDE_HCYL_REG          (HWIF(drive)->io_ports[IDE_HCYL_OFFSET])
#define IDE_SELECT_REG        (HWIF(drive)->io_ports[IDE_SELECT_OFFSET])
#define IDE_STATUS_REG        (HWIF(drive)->io_ports[IDE_STATUS_OFFSET])
#define IDE_CONTROL_REG       (HWIF(drive)->io_ports[IDE_CONTROL_OFFSET])
#define IDE_IRQ_REG           (HWIF(drive)->io_ports[IDE_IRQ_OFFSET])

#define IDE_FEATURE_REG       IDE_ERROR_REG
#define IDE_COMMAND_REG       IDE_STATUS_REG
#define IDE_ALTSTATUS_REG     IDE_CONTROL_REG
#define IDE_IREASON_REG       IDE_NSECTOR_REG
#define IDE_BCOUNTL_REG       IDE_LCYL_REG
#define IDE_BCOUNTH_REG       IDE_HCYL_REG

#define OK_STAT(stat,good,bad)      (((stat)&((good)|(bad)))==(good))
#define BAD_R_STAT            (BUSY_STAT   | ERR_STAT)
#define BAD_W_STAT            (BAD_R_STAT  | WRERR_STAT)
#define BAD_STAT        (BAD_R_STAT  | DRQ_STAT)
#define DRIVE_READY           (READY_STAT  | SEEK_STAT)
#define DATA_READY            (DRQ_STAT)

#define BAD_CRC               (ABRT_ERR    | ICRC_ERR)

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

#define SATA_STATUS_OFFSET    (0)
#define SATA_STATUS_REG       (HWIF(drive)->sata_scr[SATA_STATUS_OFFSET])
#define SATA_ERROR_OFFSET     (1)
#define SATA_ERROR_REG        (HWIF(drive)->sata_scr[SATA_ERROR_OFFSET])
#define SATA_CONTROL_OFFSET   (2)
#define SATA_CONTROL_REG      (HWIF(drive)->sata_scr[SATA_CONTROL_OFFSET])

#define SATA_MISC_OFFSET      (0)
#define SATA_MISC_REG         (HWIF(drive)->sata_misc[SATA_MISC_OFFSET])
#define SATA_PHY_OFFSET       (1)
#define SATA_PHY_REG          (HWIF(drive)->sata_misc[SATA_PHY_OFFSET])
#define SATA_IEN_OFFSET       (2)
#define SATA_IEN_REG          (HWIF(drive)->sata_misc[SATA_IEN_OFFSET])

/*
 * 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 */

/*
 * 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_etrax100,     ide_acorn,
            ide_au1xxx, ide_forced
};

typedef u8 hwif_chipset_t;

/*
 * Structure to hold all information about the location of this port
 */
typedef struct hw_regs_s {
      unsigned long     io_ports[IDE_NR_PORTS]; /* task file registers */
      int         irq;              /* our irq number */
      ide_ack_intr_t    *ack_intr;        /* acknowledge interrupt */
      hwif_chipset_t  chipset;
      struct device     *dev;
} hw_regs_t;

struct hwif_s * ide_find_port(unsigned long);

int ide_register_hw(hw_regs_t *, void (*)(struct hwif_s *), int,
                struct hwif_s **);

void ide_setup_ports(   hw_regs_t *hw,
                  unsigned long base,
                  int *offsets,
                  unsigned long ctrl,
                  unsigned long intr,
                  ide_ack_intr_t *ack_intr,
#if 0
                  ide_io_ops_t *iops,
#endif
                  int irq);

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

      for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++)
            hw->io_ports[i] = io_addr++;

      hw->io_ports[IDE_CONTROL_OFFSET] = ctl_addr;
}

#include <asm/ide.h>

#if !defined(MAX_HWIFS) || defined(CONFIG_EMBEDDED)
#undef MAX_HWIFS
#define MAX_HWIFS CONFIG_IDE_MAX_HWIFS
#endif

/* needed on alpha, x86/x86_64, ia64, mips, ppc32 and sh */
#ifndef IDE_ARCH_OBSOLETE_DEFAULTS
# define ide_default_io_base(index) (0)
# define ide_default_irq(base)            (0)
# define ide_init_default_irq(base) (0)
#endif

#ifdef CONFIG_IDE_ARCH_OBSOLETE_INIT
static inline void ide_init_hwif_ports(hw_regs_t *hw,
                               unsigned long io_addr,
                               unsigned long ctl_addr,
                               int *irq)
{
      if (!ctl_addr)
            ide_std_init_ports(hw, io_addr, ide_default_io_ctl(io_addr));
      else
            ide_std_init_ports(hw, io_addr, ctl_addr);

      if (irq)
            *irq = 0;

      hw->io_ports[IDE_IRQ_OFFSET] = 0;

#ifdef CONFIG_PPC32
      if (ppc_ide_md.ide_init_hwif)
            ppc_ide_md.ide_init_hwif(hw, io_addr, ctl_addr, irq);
#endif
}
#else
static inline void ide_init_hwif_ports(hw_regs_t *hw,
                               unsigned long io_addr,
                               unsigned long ctl_addr,
                               int *irq)
{
      if (io_addr || ctl_addr)
            printk(KERN_WARNING "%s: must not be called\n", __FUNCTION__);
}
#endif /* CONFIG_IDE_ARCH_OBSOLETE_INIT */

/* 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 {
#if defined(__LITTLE_ENDIAN_BITFIELD)
            unsigned set_geometry   : 1;
            unsigned recalibrate    : 1;
            unsigned set_multmode   : 1;
            unsigned set_tune : 1;
            unsigned serviced : 1;
            unsigned reserved : 3;
#elif defined(__BIG_ENDIAN_BITFIELD)
            unsigned reserved : 3;
            unsigned serviced : 1;
            unsigned set_tune : 1;
            unsigned set_multmode   : 1;
            unsigned recalibrate    : 1;
            unsigned set_geometry   : 1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
      } b;
} special_t;

/*
 * ATA DATA Register Special.
 * ATA NSECTOR Count Register().
 * ATAPI Byte Count Register.
 */
typedef union {
      unsigned all                  :16;
      struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
            unsigned low            :8;   /* LSB */
            unsigned high           :8;   /* MSB */
#elif defined(__BIG_ENDIAN_BITFIELD)
            unsigned high           :8;   /* MSB */
            unsigned low            :8;   /* LSB */
#else
#error "Please fix <asm/byteorder.h>"
#endif
      } b;
} ata_nsector_t, ata_data_t, atapi_bcount_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;

/*
 * The ATA-IDE Status Register.
 * The ATAPI Status Register.
 *
 * check    : Error occurred
 * idx            : Index Error
 * corr           : Correctable error occurred
 * drq            : Data is request by the device
 * dsc            : Disk Seek Complete                : ata
 *          : Media access command finished           : atapi
 * df       : Device Fault                      : ata
 *          : Reserved                    : atapi
 * drdy           : Ready, Command Mode Capable       : ata
 *          : Ignored for ATAPI commands        : atapi
 * bsy            : Disk is Busy
 *          : The device has access to the command block
 */
typedef union {
      unsigned all                  :8;
      struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
            unsigned check          :1;
            unsigned idx            :1;
            unsigned corr           :1;
            unsigned drq            :1;
            unsigned dsc            :1;
            unsigned df       :1;
            unsigned drdy           :1;
            unsigned bsy            :1;
#elif defined(__BIG_ENDIAN_BITFIELD)
            unsigned bsy            :1;
            unsigned drdy           :1;
            unsigned df       :1;
            unsigned dsc            :1;
            unsigned drq            :1;
            unsigned corr           :1;
            unsigned idx            :1;
            unsigned check          :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
      } b;
} ata_status_t, atapi_status_t;

/*
 * ATAPI Feature Register
 *
 * dma            : Using DMA or PIO
 * reserved321    : Reserved
 * reserved654    : Reserved (Tag Type)
 * reserved7      : Reserved
 */
typedef union {
      unsigned all                  :8;
      struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
            unsigned dma            :1;
            unsigned reserved321    :3;
            unsigned reserved654    :3;
            unsigned reserved7      :1;
#elif defined(__BIG_ENDIAN_BITFIELD)
            unsigned reserved7      :1;
            unsigned reserved654    :3;
            unsigned reserved321    :3;
            unsigned dma            :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
      } b;
} atapi_feature_t;

/*
 * ATAPI Interrupt Reason Register.
 *
 * cod            : Information transferred is command (1) or data (0)
 * io       : The device requests us to read (1) or write (0)
 * reserved : Reserved
 */
typedef union {
      unsigned all                  :8;
      struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
            unsigned cod            :1;
            unsigned io       :1;
            unsigned reserved :6;
#elif defined(__BIG_ENDIAN_BITFIELD)
            unsigned reserved :6;
            unsigned io       :1;
            unsigned cod            :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
      } b;
} atapi_ireason_t;

/*
 * The ATAPI error register.
 *
 * ili            : Illegal Length Indication
 * eom            : End Of Media Detected
 * abrt           : Aborted command - As defined by ATA
 * mcr            : Media Change Requested - As defined by ATA
 * sense_key      : Sense key of the last failed packet command
 */
typedef union {
      unsigned all                  :8;
      struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
            unsigned ili            :1;
            unsigned eom            :1;
            unsigned abrt           :1;
            unsigned mcr            :1;
            unsigned sense_key      :4;
#elif defined(__BIG_ENDIAN_BITFIELD)
            unsigned sense_key      :4;
            unsigned mcr            :1;
            unsigned abrt           :1;
            unsigned eom            :1;
            unsigned ili            :1;
#else
#error "Please fix <asm/byteorder.h>"
#endif
      } b;
} atapi_error_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

typedef 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 */
      struct hd_driveid *id;  /* drive model 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    bswap;                  /* byte swap data */
      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 nice0          : 1;  /* give obvious excess bandwidth */
      unsigned nice2          : 1;  /* give a share in our own bandwidth */
      unsigned doorlocking    : 1;  /* for removable only: door lock/unlock works */
      unsigned nodma          : 1;  /* disallow DMA */
      unsigned autotune : 2;  /* 0=default, 1=autotune, 2=noautotune */
      unsigned remap_0_to_1   : 1;  /* 0=noremap, 1=remap 0->1 (for EZDrive) */
      unsigned blocked        : 1;  /* 1=powermanagment told us not to do anything, so sleep nicely */
      unsigned vdma           : 1;  /* 1=doing PIO over DMA 0=doing normal DMA */
      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    ctl;        /* "normal" value for IDE_CONTROL_REG */
      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 WRERR_STAT */
      u8    nowerr;           /* used for ignoring WRERR_STAT */
      u8    sect0;            /* offset of first sector for DM6:DDO */
      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() */
} ide_drive_t;

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

#define IDE_CHIPSET_PCI_MASK  \
    ((1<<ide_pci)|(1<<ide_cmd646)|(1<<ide_ali14xx))
#define IDE_CHIPSET_IS_PCI(c) ((IDE_CHIPSET_PCI_MASK >> (c)) & 1)

struct ide_port_info;

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 */

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

            /* task file registers for pata and sata */
      unsigned long     io_ports[IDE_NR_PORTS];
      unsigned long     sata_scr[SATA_NR_PORTS];
      unsigned long     sata_misc[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 straight8;     /* Alan's straight 8 check */
      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 pci_dev  *pci_dev;     /* for pci chipsets */
      const struct ide_port_info *cds;    /* chipset device struct */

      ide_ack_intr_t *ack_intr;

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

#if 0
      ide_hwif_ops_t    *hwifops;
#else
      /* routine to program host for PIO mode */
      void  (*set_pio_mode)(ide_drive_t *, const u8);
      /* routine to program host for DMA mode */
      void  (*set_dma_mode)(ide_drive_t *, const u8);
      /* tweaks hardware to select drive */
      void  (*selectproc)(ide_drive_t *);
      /* chipset polling based on hba specifics */
      int   (*reset_poll)(ide_drive_t *);
      /* chipset specific changes to default for device-hba resets */
      void  (*pre_reset)(ide_drive_t *);
      /* routine to reset controller after a disk reset */
      void  (*resetproc)(ide_drive_t *);
      /* special interrupt handling for shared pci interrupts */
      void  (*intrproc)(ide_drive_t *);
      /* special host masking for drive selection */
      void  (*maskproc)(ide_drive_t *, int);
      /* check host's drive quirk list */
      int   (*quirkproc)(ide_drive_t *);
      /* driver soft-power interface */
      int   (*busproc)(ide_drive_t *, int);
#endif
      u8 (*mdma_filter)(ide_drive_t *);
      u8 (*udma_filter)(ide_drive_t *);

      void (*fixup)(struct hwif_s *);

      void (*ata_input_data)(ide_drive_t *, void *, u32);
      void (*ata_output_data)(ide_drive_t *, void *, u32);

      void (*atapi_input_bytes)(ide_drive_t *, void *, u32);
      void (*atapi_output_bytes)(ide_drive_t *, void *, u32);

      int (*dma_setup)(ide_drive_t *);
      void (*dma_exec_cmd)(ide_drive_t *, u8);
      void (*dma_start)(ide_drive_t *);
      int (*ide_dma_end)(ide_drive_t *drive);
      int (*ide_dma_on)(ide_drive_t *drive);
      void (*dma_off_quietly)(ide_drive_t *drive);
      int (*ide_dma_test_irq)(ide_drive_t *drive);
      void (*ide_dma_clear_irq)(ide_drive_t *drive);
      void (*dma_host_on)(ide_drive_t *drive);
      void (*dma_host_off)(ide_drive_t *drive);
      void (*dma_lost_irq)(ide_drive_t *drive);
      void (*dma_timeout)(ide_drive_t *drive);

      void (*OUTB)(u8 addr, unsigned long port);
      void (*OUTBSYNC)(ide_drive_t *drive, u8 addr, unsigned long port);
      void (*OUTW)(u16 addr, unsigned long port);
      void (*OUTSW)(unsigned long port, void *addr, u32 count);
      void (*OUTSL)(unsigned long port, void *addr, u32 count);

      u8  (*INB)(unsigned long port);
      u16 (*INW)(unsigned long port);
      void (*INSW)(unsigned long port, void *addr, u32 count);
      void (*INSL)(unsigned long port, void *addr, u32 count);

      /* 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_master; /* reference base addr dmabase */
      unsigned long     dma_base;   /* base addr for dma ports */
      unsigned long     dma_command;      /* dma command register */
      unsigned long     dma_vendor1;      /* dma vendor 1 register */
      unsigned long     dma_status; /* dma status register */
      unsigned long     dma_vendor3;      /* dma vendor 3 register */
      unsigned long     dma_prdtable;     /* actual prd table address */

      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    noprobe    : 1;   /* don't probe for this interface */
      unsigned    present    : 1;   /* this interface exists */
      unsigned    hold       : 1; /* this interface is always present */
      unsigned    serialized : 1;   /* serialized all channel operation */
      unsigned    sharing_irq: 1;   /* 1 = sharing irq with another hwif */
      unsigned    reset      : 1;   /* reset after probe */
      unsigned    auto_poll  : 1; /* supports nop auto-poll */
      unsigned    sg_mapped  : 1;   /* sg_table and sg_nents are ready */
      unsigned    no_io_32bit : 1; /* 1 = can not do 32-bit IO ops */
      unsigned    mmio       : 1; /* host uses MMIO */

      struct device     gendev;
      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;

/*
 *  internal ide interrupt handler type
 */
typedef ide_startstop_t (ide_pre_handler_t)(ide_drive_t *, struct request *);
typedef ide_startstop_t (ide_handler_t)(ide_drive_t *);
typedef int (ide_expiry_t)(ide_drive_t *);

typedef struct hwgroup_s {
            /* irq handler, if active */
      ide_startstop_t   (*handler)(ide_drive_t *);
            /* irq handler, suspended if active */
      ide_startstop_t   (*handler_save)(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;
            /* BOOL: in a polling reset situation. Must not trigger another reset yet */
      unsigned int resetting  : 1;

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

            /* for pci chipsets */
      struct pci_dev *pci_dev;

            /* current request */
      struct request *rq;
            /* failsafe timer */
      struct timer_list timer;
            /* local copy of current write rq */
      struct request wrq;
            /* timeout value during long polls */
      unsigned long poll_timeout;
            /* queried upon timeouts */
      int (*expiry)(ide_drive_t *);
            /* ide_system_bus_speed */
      int pio_clock;
      int req_gen;
      int req_gen_timer;

      unsigned char cmd_buf[4];
} 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_pio_mode(ide_drive_t *, int);
int set_using_dma(ide_drive_t *, int);

#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_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;

#ifdef CONFIG_BLK_DEV_IDEPCI
void ide_pci_create_host_proc(const char *, get_info_t *);
#endif

/*
 * 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_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);
      ide_startstop_t   (*abort)(ide_drive_t *, struct request *rq);
      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 generic_ide_ioctl(ide_drive_t *, struct file *, struct block_device *, unsigned, unsigned long);

/*
 * ide_hwifs[] is the master data structure used to keep track
 * of just about everything in ide.c.  Whenever possible, routines
 * should be using pointers to a drive (ide_drive_t *) or
 * pointers to a hwif (ide_hwif_t *), rather than indexing this
 * structure directly (the allocation/layout may change!).
 *
 */
#ifndef _IDE_C
extern      ide_hwif_t  ide_hwifs[];            /* master data repository */
#endif
extern int noautodma;

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);

extern void ide_execute_command(ide_drive_t *, task_ioreg_t cmd, ide_handler_t *, unsigned int, ide_expiry_t *);

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);

ide_startstop_t __ide_abort(ide_drive_t *, struct request *);

extern ide_startstop_t ide_abort(ide_drive_t *, const char *);

extern void ide_fix_driveid(struct hd_driveid *);

extern void ide_fixstring(u8 *, const int, const 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_init_drive_cmd (struct request *rq);

/*
 * "action" parameter type for ide_do_drive_cmd() below.
 */
typedef enum {
      ide_wait,   /* insert rq at end of list, and wait for it */
      ide_preempt,      /* insert rq in front of current request */
      ide_head_wait,    /* insert rq in front of current request and wait for it */
      ide_end           /* insert rq at end of list, but don't wait for it */
} ide_action_t;

extern int ide_do_drive_cmd(ide_drive_t *, struct request *, ide_action_t);

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

/*
 * Issue ATA command and wait for completion.
 * Use for implementing commands in kernel
 *
 *  (ide_drive_t *drive, u8 cmd, u8 nsect, u8 feature, u8 sectors, u8 *buf)
 */
extern int ide_wait_cmd(ide_drive_t *, u8, u8, u8, u8, u8 *);

typedef struct ide_task_s {
/*
 *    struct hd_drive_task_hdr      tf;
 *    task_struct_t           tf;
 *    struct hd_drive_hob_hdr       hobf;
 *    hob_struct_t            hobf;
 */
      task_ioreg_t            tfRegister[8];
      task_ioreg_t            hobRegister[8];
      ide_reg_valid_t         tf_out_flags;
      ide_reg_valid_t         tf_in_flags;
      int               data_phase;
      int               command_type;
      ide_pre_handler_t *prehandler;
      ide_handler_t           *handler;
      struct request          *rq;        /* copy of request */
      void              *special;   /* valid_t generally */
} ide_task_t;

extern u32 ide_read_24(ide_drive_t *);

extern void SELECT_DRIVE(ide_drive_t *);
extern void SELECT_INTERRUPT(ide_drive_t *);
extern void SELECT_MASK(ide_drive_t *, int);
extern void QUIRK_LIST(ide_drive_t *);

extern int drive_is_ready(ide_drive_t *);

/*
 * taskfile io for disks for now...and builds request from ide_ioctl
 */
extern ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);

/*
 * Special Flagged Register Validation Caller
 */
extern ide_startstop_t flagged_taskfile(ide_drive_t *, ide_task_t *);

extern ide_startstop_t set_multmode_intr(ide_drive_t *);
extern ide_startstop_t set_geometry_intr(ide_drive_t *);
extern ide_startstop_t recal_intr(ide_drive_t *);
extern ide_startstop_t task_no_data_intr(ide_drive_t *);
extern ide_startstop_t task_in_intr(ide_drive_t *);
extern ide_startstop_t pre_task_out_intr(ide_drive_t *, struct request *);

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

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 system_bus_clock(void);

extern int ide_driveid_update(ide_drive_t *);
extern int ide_ata66_check(ide_drive_t *, ide_task_t *);
extern int ide_config_drive_speed(ide_drive_t *, u8);
extern u8 eighty_ninty_three (ide_drive_t *);
extern int set_transfer(ide_drive_t *, ide_task_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 *);

extern int ideprobe_init(void);

#ifdef CONFIG_IDEPCI_PCIBUS_ORDER
extern void ide_scan_pcibus(int scan_direction) __init;
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, u8 *);
void ide_setup_pci_noise(struct pci_dev *, const struct ide_port_info *);

extern void default_hwif_iops(ide_hwif_t *);
extern void default_hwif_mmiops(ide_hwif_t *);
extern void default_hwif_transport(ide_hwif_t *);

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),
      /* don't use conservative PIO "downgrade" */
      IDE_HFLAG_PIO_NO_DOWNGRADE    = (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 uses VDMA */
      IDE_HFLAG_VDMA                = (1 << 11),
      /* ATAPI DMA is unsupported */
      IDE_HFLAG_NO_ATAPI_DMA        = (1 << 12),
      /* set if host is a "bootable" controller */
      IDE_HFLAG_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 is CS5510/CS5520 */
      IDE_HFLAG_CS5520        = (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),
};

#ifdef CONFIG_BLK_DEV_OFFBOARD
# define IDE_HFLAG_OFF_BOARD  IDE_HFLAG_BOOTABLE
#else
# define IDE_HFLAG_OFF_BOARD  0
#endif

struct ide_port_info {
      char              *name;
      unsigned int            (*init_chipset)(struct pci_dev *, const char *);
      void              (*init_iops)(ide_hwif_t *);
      void                    (*init_hwif)(ide_hwif_t *);
      void              (*init_dma)(ide_hwif_t *, unsigned long);
      void              (*fixup)(ide_hwif_t *);
      ide_pci_enablebit_t     enablebits[2];
      hwif_chipset_t          chipset;
      unsigned int            extra;
      u32               host_flags;
      u8                pio_mask;
      u8                swdma_mask;
      u8                mwdma_mask;
      u8                udma_mask;
};

int ide_setup_pci_device(struct pci_dev *, const struct ide_port_info *);
int ide_setup_pci_devices(struct pci_dev *, struct pci_dev *, const struct ide_port_info *);

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(struct hd_driveid *, 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(ide_drive_t *);
int ide_set_dma(ide_drive_t *);
ide_startstop_t ide_dma_intr(ide_drive_t *);

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
extern int ide_build_sglist(ide_drive_t *, struct request *);
extern int ide_build_dmatable(ide_drive_t *, struct request *);
extern void ide_destroy_dmatable(ide_drive_t *);
extern int ide_release_dma(ide_hwif_t *);
extern void ide_setup_dma(ide_hwif_t *, unsigned long, unsigned int);

void ide_dma_host_off(ide_drive_t *);
void ide_dma_off_quietly(ide_drive_t *);
void ide_dma_host_on(ide_drive_t *);
extern int __ide_dma_on(ide_drive_t *);
extern int ide_dma_setup(ide_drive_t *);
extern void ide_dma_start(ide_drive_t *);
extern int __ide_dma_end(ide_drive_t *);
extern void ide_dma_lost_irq(ide_drive_t *);
extern void ide_dma_timeout(ide_drive_t *);
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */

#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(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; }
#endif /* CONFIG_BLK_DEV_IDEDMA */

#ifndef CONFIG_BLK_DEV_IDEDMA_PCI
static inline void ide_release_dma(ide_hwif_t *drive) {;}
#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);
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_set_state(ide_hwif_t *hwif, int on) {}
#endif

extern int ide_hwif_request_regions(ide_hwif_t *hwif);
extern void ide_hwif_release_regions(ide_hwif_t* hwif);
extern void ide_unregister (unsigned int index);

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

void ide_undecoded_slave(ide_hwif_t *);

int ide_device_add(u8 idx[4]);

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(struct hd_driveid *id)
{
      return ((id->field_valid & 2) && (id->capability & 8)) ? 1 : 0;
}

static inline int ide_dev_is_sata(struct hd_driveid *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->hw_config == 0 && (short)id->major_rev_num >= 0x0020)
            return 1;
      return 0;
}

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

typedef struct ide_pio_timings_s {
      int   setup_time; /* Address setup (ns) minimum */
      int   active_time;      /* Active pulse (ns) minimum */
      int   cycle_time; /* Cycle time (ns) minimum = */
                        /* active + recovery (+ setup for some chips) */
} ide_pio_timings_t;

unsigned int ide_pio_cycle_time(ide_drive_t *, u8);
u8 ide_get_best_pio_mode(ide_drive_t *, u8, u8);
extern const ide_pio_timings_t ide_pio_timings[6];

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;

/* check if CACHE FLUSH (EXT) command is supported (bits defined in ATA-6) */
#define ide_id_has_flush_cache(id)  ((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)->cfs_enable_2 & 0x2400) == 0x2400)

static inline int hwif_to_node(ide_hwif_t *hwif)
{
      struct pci_dev *dev = hwif->pci_dev;
      return dev ? pcibus_to_node(dev->bus) : -1;
}

static inline ide_drive_t *ide_get_paired_drive(ide_drive_t *drive)
{
      ide_hwif_t *hwif  = HWIF(drive);

      return &hwif->drives[(drive->dn ^ 1) & 1];
}

#endif /* _IDE_H */

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