ide-disk.c

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/*
 *  Copyright (C) 1994-1998    Linus Torvalds & authors (see below)
 *  Copyright (C) 1998-2002    Linux ATA Development
 *                    Andre Hedrick <[email protected]>
 *  Copyright (C) 2003         Red Hat
 *  Copyright (C) 2003-2005, 2007  Bartlomiej Zolnierkiewicz
 */

/*
 *  Mostly written by Mark Lord <[email protected]>
 *                and Gadi Oxman <[email protected]>
 *                and Andre Hedrick <[email protected]>
 *
 * This is the IDE/ATA disk driver, as evolved from hd.c and ide.c.
 */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/leds.h>
#include <linux/ide.h>

#include <asm/byteorder.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/div64.h>

#include "ide-disk.h"

static const u8 ide_rw_cmds[] = {
    ATA_CMD_READ_MULTI,
    ATA_CMD_WRITE_MULTI,
    ATA_CMD_READ_MULTI_EXT,
    ATA_CMD_WRITE_MULTI_EXT,
    ATA_CMD_PIO_READ,
    ATA_CMD_PIO_WRITE,
    ATA_CMD_PIO_READ_EXT,
    ATA_CMD_PIO_WRITE_EXT,
    ATA_CMD_READ,
    ATA_CMD_WRITE,
    ATA_CMD_READ_EXT,
    ATA_CMD_WRITE_EXT,
};

static void ide_tf_set_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 dma)
{
    u8 index, lba48, write;

    lba48 = (cmd->tf_flags & IDE_TFLAG_LBA48) ? 2 : 0;
    write = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 1 : 0;

    if (dma) {
        cmd->protocol = ATA_PROT_DMA;
        index = 8;
    } else {
        cmd->protocol = ATA_PROT_PIO;
        if (drive->mult_count) {
            cmd->tf_flags |= IDE_TFLAG_MULTI_PIO;
            index = 0;
        } else
            index = 4;
    }

    cmd->tf.command = ide_rw_cmds[index + lba48 + write];
}

/*
 * __ide_do_rw_disk() issues READ and WRITE commands to a disk,
 * using LBA if supported, or CHS otherwise, to address sectors.
 */
static ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
                    sector_t block)
{
    ide_hwif_t *hwif    = drive->hwif;
    u16 nsectors        = (u16)blk_rq_sectors(rq);
    u8 lba48        = !!(drive->dev_flags & IDE_DFLAG_LBA48);
    u8 dma          = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
    struct ide_cmd      cmd;
    struct ide_taskfile *tf = &cmd.tf;
    ide_startstop_t     rc;

    if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) {
        if (block + blk_rq_sectors(rq) > 1ULL << 28)
            dma = 0;
        else
            lba48 = 0;
    }

    memset(&cmd, 0, sizeof(cmd));
    cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
    cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;

    if (drive->dev_flags & IDE_DFLAG_LBA) {
        if (lba48) {
            pr_debug("%s: LBA=0x%012llx\n", drive->name,
                    (unsigned long long)block);

            tf->nsect  = nsectors & 0xff;
            tf->lbal   = (u8) block;
            tf->lbam   = (u8)(block >>  8);
            tf->lbah   = (u8)(block >> 16);
            tf->device = ATA_LBA;

            tf = &cmd.hob;
            tf->nsect = (nsectors >> 8) & 0xff;
            tf->lbal  = (u8)(block >> 24);
            if (sizeof(block) != 4) {
                tf->lbam = (u8)((u64)block >> 32);
                tf->lbah = (u8)((u64)block >> 40);
            }

            cmd.valid.out.hob = IDE_VALID_OUT_HOB;
            cmd.valid.in.hob  = IDE_VALID_IN_HOB;
            cmd.tf_flags |= IDE_TFLAG_LBA48;
        } else {
            tf->nsect  = nsectors & 0xff;
            tf->lbal   = block;
            tf->lbam   = block >>= 8;
            tf->lbah   = block >>= 8;
            tf->device = ((block >> 8) & 0xf) | ATA_LBA;
        }
    } else {
        unsigned int sect, head, cyl, track;

        track = (int)block / drive->sect;
        sect  = (int)block % drive->sect + 1;
        head  = track % drive->head;
        cyl   = track / drive->head;

        pr_debug("%s: CHS=%u/%u/%u\n", drive->name, cyl, head, sect);

        tf->nsect  = nsectors & 0xff;
        tf->lbal   = sect;
        tf->lbam   = cyl;
        tf->lbah   = cyl >> 8;
        tf->device = head;
    }

    cmd.tf_flags |= IDE_TFLAG_FS;

    if (rq_data_dir(rq))
        cmd.tf_flags |= IDE_TFLAG_WRITE;

    ide_tf_set_cmd(drive, &cmd, dma);
    cmd.rq = rq;

    if (dma == 0) {
        ide_init_sg_cmd(&cmd, nsectors << 9);
        ide_map_sg(drive, &cmd);
    }

    rc = do_rw_taskfile(drive, &cmd);

    if (rc == ide_stopped && dma) {
        /* fallback to PIO */
        cmd.tf_flags |= IDE_TFLAG_DMA_PIO_FALLBACK;
        ide_tf_set_cmd(drive, &cmd, 0);
        ide_init_sg_cmd(&cmd, nsectors << 9);
        rc = do_rw_taskfile(drive, &cmd);
    }

    return rc;
}

/*
 * 268435455  == 137439 MB or 28bit limit
 * 320173056  == 163929 MB or 48bit addressing
 * 1073741822 == 549756 MB or 48bit addressing fake drive
 */

static ide_startstop_t ide_do_rw_disk(ide_drive_t *drive, struct request *rq,
                      sector_t block)
{
    ide_hwif_t *hwif = drive->hwif;

    BUG_ON(drive->dev_flags & IDE_DFLAG_BLOCKED);
    BUG_ON(rq->cmd_type != REQ_TYPE_FS);

    ledtrig_ide_activity();

    pr_debug("%s: %sing: block=%llu, sectors=%u, buffer=0x%08lx\n",
         drive->name, rq_data_dir(rq) == READ ? "read" : "writ",
         (unsigned long long)block, blk_rq_sectors(rq),
         (unsigned long)rq->buffer);

    if (hwif->rw_disk)
        hwif->rw_disk(drive, rq);

    return __ide_do_rw_disk(drive, rq, block);
}

/*
 * Queries for true maximum capacity of the drive.
 * Returns maximum LBA address (> 0) of the drive, 0 if failed.
 */
static u64 idedisk_read_native_max_address(ide_drive_t *drive, int lba48)
{
    struct ide_cmd cmd;
    struct ide_taskfile *tf = &cmd.tf;
    u64 addr = 0;

    memset(&cmd, 0, sizeof(cmd));
    if (lba48)
        tf->command = ATA_CMD_READ_NATIVE_MAX_EXT;
    else
        tf->command = ATA_CMD_READ_NATIVE_MAX;
    tf->device  = ATA_LBA;

    cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
    cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
    if (lba48) {
        cmd.valid.out.hob = IDE_VALID_OUT_HOB;
        cmd.valid.in.hob  = IDE_VALID_IN_HOB;
        cmd.tf_flags = IDE_TFLAG_LBA48;
    }

    ide_no_data_taskfile(drive, &cmd);

    /* if OK, compute maximum address value */
    if (!(tf->status & ATA_ERR))
        addr = ide_get_lba_addr(&cmd, lba48) + 1;

    return addr;
}

/*
 * Sets maximum virtual LBA address of the drive.
 * Returns new maximum virtual LBA address (> 0) or 0 on failure.
 */
static u64 idedisk_set_max_address(ide_drive_t *drive, u64 addr_req, int lba48)
{
    struct ide_cmd cmd;
    struct ide_taskfile *tf = &cmd.tf;
    u64 addr_set = 0;

    addr_req--;

    memset(&cmd, 0, sizeof(cmd));
    tf->lbal     = (addr_req >>  0) & 0xff;
    tf->lbam     = (addr_req >>= 8) & 0xff;
    tf->lbah     = (addr_req >>= 8) & 0xff;
    if (lba48) {
        cmd.hob.lbal = (addr_req >>= 8) & 0xff;
        cmd.hob.lbam = (addr_req >>= 8) & 0xff;
        cmd.hob.lbah = (addr_req >>= 8) & 0xff;
        tf->command  = ATA_CMD_SET_MAX_EXT;
    } else {
        tf->device   = (addr_req >>= 8) & 0x0f;
        tf->command  = ATA_CMD_SET_MAX;
    }
    tf->device |= ATA_LBA;

    cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
    cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;
    if (lba48) {
        cmd.valid.out.hob = IDE_VALID_OUT_HOB;
        cmd.valid.in.hob  = IDE_VALID_IN_HOB;
        cmd.tf_flags = IDE_TFLAG_LBA48;
    }

    ide_no_data_taskfile(drive, &cmd);

    /* if OK, compute maximum address value */
    if (!(tf->status & ATA_ERR))
        addr_set = ide_get_lba_addr(&cmd, lba48) + 1;

    return addr_set;
}

static unsigned long long sectors_to_MB(unsigned long long n)
{
    n <<= 9;        /* make it bytes */
    do_div(n, 1000000); /* make it MB */
    return n;
}

/*
 * Some disks report total number of sectors instead of
 * maximum sector address.  We list them here.
 */
static const struct drive_list_entry hpa_list[] = {
    { "ST340823A",  NULL },
    { "ST320413A",  NULL },
    { "ST310211A",  NULL },
    { NULL,     NULL }
};

static u64 ide_disk_hpa_get_native_capacity(ide_drive_t *drive, int lba48)
{
    u64 capacity, set_max;

    capacity = drive->capacity64;
    set_max  = idedisk_read_native_max_address(drive, lba48);

    if (ide_in_drive_list(drive->id, hpa_list)) {
        /*
         * Since we are inclusive wrt to firmware revisions do this
         * extra check and apply the workaround only when needed.
         */
        if (set_max == capacity + 1)
            set_max--;
    }

    return set_max;
}

static u64 ide_disk_hpa_set_capacity(ide_drive_t *drive, u64 set_max, int lba48)
{
    set_max = idedisk_set_max_address(drive, set_max, lba48);
    if (set_max)
        drive->capacity64 = set_max;

    return set_max;
}

static void idedisk_check_hpa(ide_drive_t *drive)
{
    u64 capacity, set_max;
    int lba48 = ata_id_lba48_enabled(drive->id);

    capacity = drive->capacity64;
    set_max  = ide_disk_hpa_get_native_capacity(drive, lba48);

    if (set_max <= capacity)
        return;

    drive->probed_capacity = set_max;

    printk(KERN_INFO "%s: Host Protected Area detected.\n"
             "\tcurrent capacity is %llu sectors (%llu MB)\n"
             "\tnative  capacity is %llu sectors (%llu MB)\n",
             drive->name,
             capacity, sectors_to_MB(capacity),
             set_max, sectors_to_MB(set_max));

    if ((drive->dev_flags & IDE_DFLAG_NOHPA) == 0)
        return;

    set_max = ide_disk_hpa_set_capacity(drive, set_max, lba48);
    if (set_max)
        printk(KERN_INFO "%s: Host Protected Area disabled.\n",
                 drive->name);
}

static int ide_disk_get_capacity(ide_drive_t *drive)
{
    u16 *id = drive->id;
    int lba;

    if (ata_id_lba48_enabled(id)) {
        /* drive speaks 48-bit LBA */
        lba = 1;
        drive->capacity64 = ata_id_u64(id, ATA_ID_LBA_CAPACITY_2);
    } else if (ata_id_has_lba(id) && ata_id_is_lba_capacity_ok(id)) {
        /* drive speaks 28-bit LBA */
        lba = 1;
        drive->capacity64 = ata_id_u32(id, ATA_ID_LBA_CAPACITY);
    } else {
        /* drive speaks boring old 28-bit CHS */
        lba = 0;
        drive->capacity64 = drive->cyl * drive->head * drive->sect;
    }

    drive->probed_capacity = drive->capacity64;

    if (lba) {
        drive->dev_flags |= IDE_DFLAG_LBA;

        /*
        * If this device supports the Host Protected Area feature set,
        * then we may need to change our opinion about its capacity.
        */
        if (ata_id_hpa_enabled(id))
            idedisk_check_hpa(drive);
    }

    /* limit drive capacity to 137GB if LBA48 cannot be used */
    if ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 &&
        drive->capacity64 > 1ULL << 28) {
        printk(KERN_WARNING "%s: cannot use LBA48 - full capacity "
               "%llu sectors (%llu MB)\n",
               drive->name, (unsigned long long)drive->capacity64,
               sectors_to_MB(drive->capacity64));
        drive->probed_capacity = drive->capacity64 = 1ULL << 28;
    }

    if ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) &&
        (drive->dev_flags & IDE_DFLAG_LBA48)) {
        if (drive->capacity64 > 1ULL << 28) {
            printk(KERN_INFO "%s: cannot use LBA48 DMA - PIO mode"
                     " will be used for accessing sectors "
                     "> %u\n", drive->name, 1 << 28);
        } else
            drive->dev_flags &= ~IDE_DFLAG_LBA48;
    }

    return 0;
}

static void ide_disk_unlock_native_capacity(ide_drive_t *drive)
{
    u16 *id = drive->id;
    int lba48 = ata_id_lba48_enabled(id);

    if ((drive->dev_flags & IDE_DFLAG_LBA) == 0 ||
        ata_id_hpa_enabled(id) == 0)
        return;

    /*
     * according to the spec the SET MAX ADDRESS command shall be
     * immediately preceded by a READ NATIVE MAX ADDRESS command
     */
    if (!ide_disk_hpa_get_native_capacity(drive, lba48))
        return;

    if (ide_disk_hpa_set_capacity(drive, drive->probed_capacity, lba48))
        drive->dev_flags |= IDE_DFLAG_NOHPA; /* disable HPA on resume */
}

static int idedisk_prep_fn(struct request_queue *q, struct request *rq)
{
    ide_drive_t *drive = q->queuedata;
    struct ide_cmd *cmd;

    if (!(rq->cmd_flags & REQ_FLUSH))
        return BLKPREP_OK;

    if (rq->special) {
        cmd = rq->special;
        memset(cmd, 0, sizeof(*cmd));
    } else {
        cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
    }

    /* FIXME: map struct ide_taskfile on rq->cmd[] */
    BUG_ON(cmd == NULL);

    if (ata_id_flush_ext_enabled(drive->id) &&
        (drive->capacity64 >= (1UL << 28)))
        cmd->tf.command = ATA_CMD_FLUSH_EXT;
    else
        cmd->tf.command = ATA_CMD_FLUSH;
    cmd->valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
    cmd->tf_flags = IDE_TFLAG_DYN;
    cmd->protocol = ATA_PROT_NODATA;

    rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
    rq->special = cmd;
    cmd->rq = rq;

    return BLKPREP_OK;
}

ide_devset_get(multcount, mult_count);

/*
 * This is tightly woven into the driver->do_special can not touch.
 * DON'T do it again until a total personality rewrite is committed.
 */
static int set_multcount(ide_drive_t *drive, int arg)
{
    struct request *rq;
    int error;

    if (arg < 0 || arg > (drive->id[ATA_ID_MAX_MULTSECT] & 0xff))
        return -EINVAL;

    if (drive->special_flags & IDE_SFLAG_SET_MULTMODE)
        return -EBUSY;

    rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
    rq->cmd_type = REQ_TYPE_ATA_TASKFILE;

    drive->mult_req = arg;
    drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
    error = blk_execute_rq(drive->queue, NULL, rq, 0);
    blk_put_request(rq);

    return (drive->mult_count == arg) ? 0 : -EIO;
}

ide_devset_get_flag(nowerr, IDE_DFLAG_NOWERR);

static int set_nowerr(ide_drive_t *drive, int arg)
{
    if (arg < 0 || arg > 1)
        return -EINVAL;

    if (arg)
        drive->dev_flags |= IDE_DFLAG_NOWERR;
    else
        drive->dev_flags &= ~IDE_DFLAG_NOWERR;

    drive->bad_wstat = arg ? BAD_R_STAT : BAD_W_STAT;

    return 0;
}

static int ide_do_setfeature(ide_drive_t *drive, u8 feature, u8 nsect)
{
    struct ide_cmd cmd;

    memset(&cmd, 0, sizeof(cmd));
    cmd.tf.feature = feature;
    cmd.tf.nsect   = nsect;
    cmd.tf.command = ATA_CMD_SET_FEATURES;
    cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
    cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;

    return ide_no_data_taskfile(drive, &cmd);
}

static void update_flush(ide_drive_t *drive)
{
    u16 *id = drive->id;
    unsigned flush = 0;

    if (drive->dev_flags & IDE_DFLAG_WCACHE) {
        unsigned long long capacity;
        int barrier;
        /*
         * We must avoid issuing commands a drive does not
         * understand or we may crash it. We check flush cache
         * is supported. We also check we have the LBA48 flush
         * cache if the drive capacity is too large. By this
         * time we have trimmed the drive capacity if LBA48 is
         * not available so we don't need to recheck that.
         */
        capacity = ide_gd_capacity(drive);
        barrier = ata_id_flush_enabled(id) &&
            (drive->dev_flags & IDE_DFLAG_NOFLUSH) == 0 &&
            ((drive->dev_flags & IDE_DFLAG_LBA48) == 0 ||
             capacity <= (1ULL << 28) ||
             ata_id_flush_ext_enabled(id));

        printk(KERN_INFO "%s: cache flushes %ssupported\n",
               drive->name, barrier ? "" : "not ");

        if (barrier) {
            flush = REQ_FLUSH;
            blk_queue_prep_rq(drive->queue, idedisk_prep_fn);
        }
    }

    blk_queue_flush(drive->queue, flush);
}

ide_devset_get_flag(wcache, IDE_DFLAG_WCACHE);

static int set_wcache(ide_drive_t *drive, int arg)
{
    int err = 1;

    if (arg < 0 || arg > 1)
        return -EINVAL;

    if (ata_id_flush_enabled(drive->id)) {
        err = ide_do_setfeature(drive,
            arg ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF, 0);
        if (err == 0) {
            if (arg)
                drive->dev_flags |= IDE_DFLAG_WCACHE;
            else
                drive->dev_flags &= ~IDE_DFLAG_WCACHE;
        }
    }

    update_flush(drive);

    return err;
}

static int do_idedisk_flushcache(ide_drive_t *drive)
{
    struct ide_cmd cmd;

    memset(&cmd, 0, sizeof(cmd));
    if (ata_id_flush_ext_enabled(drive->id))
        cmd.tf.command = ATA_CMD_FLUSH_EXT;
    else
        cmd.tf.command = ATA_CMD_FLUSH;
    cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
    cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;

    return ide_no_data_taskfile(drive, &cmd);
}

ide_devset_get(acoustic, acoustic);

static int set_acoustic(ide_drive_t *drive, int arg)
{
    if (arg < 0 || arg > 254)
        return -EINVAL;

    ide_do_setfeature(drive,
        arg ? SETFEATURES_AAM_ON : SETFEATURES_AAM_OFF, arg);

    drive->acoustic = arg;

    return 0;
}

ide_devset_get_flag(addressing, IDE_DFLAG_LBA48);

/*
 * drive->addressing:
 *  0: 28-bit
 *  1: 48-bit
 *  2: 48-bit capable doing 28-bit
 */
static int set_addressing(ide_drive_t *drive, int arg)
{
    if (arg < 0 || arg > 2)
        return -EINVAL;

    if (arg && ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
        ata_id_lba48_enabled(drive->id) == 0))
        return -EIO;

    if (arg == 2)
        arg = 0;

    if (arg)
        drive->dev_flags |= IDE_DFLAG_LBA48;
    else
        drive->dev_flags &= ~IDE_DFLAG_LBA48;

    return 0;
}

ide_ext_devset_rw(acoustic, acoustic);
ide_ext_devset_rw(address, addressing);
ide_ext_devset_rw(multcount, multcount);
ide_ext_devset_rw(wcache, wcache);

ide_ext_devset_rw_sync(nowerr, nowerr);

static int ide_disk_check(ide_drive_t *drive, const char *s)
{
    return 1;
}

static void ide_disk_setup(ide_drive_t *drive)
{
    struct ide_disk_obj *idkp = drive->driver_data;
    struct request_queue *q = drive->queue;
    ide_hwif_t *hwif = drive->hwif;
    u16 *id = drive->id;
    char *m = (char *)&id[ATA_ID_PROD];
    unsigned long long capacity;

    ide_proc_register_driver(drive, idkp->driver);

    if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0)
        return;

    if (drive->dev_flags & IDE_DFLAG_REMOVABLE) {
        /*
         * Removable disks (eg. SYQUEST); ignore 'WD' drives
         */
        if (m[0] != 'W' || m[1] != 'D')
            drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
    }

    (void)set_addressing(drive, 1);

    if (drive->dev_flags & IDE_DFLAG_LBA48) {
        int max_s = 2048;

        if (max_s > hwif->rqsize)
            max_s = hwif->rqsize;

        blk_queue_max_hw_sectors(q, max_s);
    }

    printk(KERN_INFO "%s: max request size: %dKiB\n", drive->name,
           queue_max_sectors(q) / 2);

    if (ata_id_is_ssd(id))
        queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);

    /* calculate drive capacity, and select LBA if possible */
    ide_disk_get_capacity(drive);

    /*
     * if possible, give fdisk access to more of the drive,
     * by correcting bios_cyls:
     */
    capacity = ide_gd_capacity(drive);

    if ((drive->dev_flags & IDE_DFLAG_FORCED_GEOM) == 0) {
        if (ata_id_lba48_enabled(drive->id)) {
            /* compatibility */
            drive->bios_sect = 63;
            drive->bios_head = 255;
        }

        if (drive->bios_sect && drive->bios_head) {
            unsigned int cap0 = capacity; /* truncate to 32 bits */
            unsigned int cylsz, cyl;

            if (cap0 != capacity)
                drive->bios_cyl = 65535;
            else {
                cylsz = drive->bios_sect * drive->bios_head;
                cyl = cap0 / cylsz;
                if (cyl > 65535)
                    cyl = 65535;
                if (cyl > drive->bios_cyl)
                    drive->bios_cyl = cyl;
            }
        }
    }
    printk(KERN_INFO "%s: %llu sectors (%llu MB)",
             drive->name, capacity, sectors_to_MB(capacity));

    /* Only print cache size when it was specified */
    if (id[ATA_ID_BUF_SIZE])
        printk(KERN_CONT " w/%dKiB Cache", id[ATA_ID_BUF_SIZE] / 2);

    printk(KERN_CONT ", CHS=%d/%d/%d\n",
             drive->bios_cyl, drive->bios_head, drive->bios_sect);

    /* write cache enabled? */
    if ((id[ATA_ID_CSFO] & 1) || ata_id_wcache_enabled(id))
        drive->dev_flags |= IDE_DFLAG_WCACHE;

    set_wcache(drive, 1);

    if ((drive->dev_flags & IDE_DFLAG_LBA) == 0 &&
        (drive->head == 0 || drive->head > 16)) {
        printk(KERN_ERR "%s: invalid geometry: %d physical heads?\n",
            drive->name, drive->head);
        drive->dev_flags &= ~IDE_DFLAG_ATTACH;
    } else
        drive->dev_flags |= IDE_DFLAG_ATTACH;
}

static void ide_disk_flush(ide_drive_t *drive)
{
    if (ata_id_flush_enabled(drive->id) == 0 ||
        (drive->dev_flags & IDE_DFLAG_WCACHE) == 0)
        return;

    if (do_idedisk_flushcache(drive))
        printk(KERN_INFO "%s: wcache flush failed!\n", drive->name);
}

static int ide_disk_init_media(ide_drive_t *drive, struct gendisk *disk)
{
    return 0;
}

static int ide_disk_set_doorlock(ide_drive_t *drive, struct gendisk *disk,
                 int on)
{
    struct ide_cmd cmd;
    int ret;

    if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
        return 0;

    memset(&cmd, 0, sizeof(cmd));
    cmd.tf.command = on ? ATA_CMD_MEDIA_LOCK : ATA_CMD_MEDIA_UNLOCK;
    cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
    cmd.valid.in.tf  = IDE_VALID_IN_TF  | IDE_VALID_DEVICE;

    ret = ide_no_data_taskfile(drive, &cmd);

    if (ret)
        drive->dev_flags &= ~IDE_DFLAG_DOORLOCKING;

    return ret;
}

const struct ide_disk_ops ide_ata_disk_ops = {
    .check          = ide_disk_check,
    .unlock_native_capacity = ide_disk_unlock_native_capacity,
    .get_capacity       = ide_disk_get_capacity,
    .setup          = ide_disk_setup,
    .flush          = ide_disk_flush,
    .init_media     = ide_disk_init_media,
    .set_doorlock       = ide_disk_set_doorlock,
    .do_request     = ide_do_rw_disk,
    .ioctl          = ide_disk_ioctl,
};