powerpc/mm/books3s: Add new pte bit to mark pte temporarily invalid.

[mirror_ubuntu-bionic-kernel.git] / drivers / ide / ide-disk.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 1994-1998        Linus Torvalds & authors (see below)
 *  Copyright (C) 1998-2002        Linux ATA Development
 *                                    Andre Hedrick <andre@linux-ide.org>
 *  Copyright (C) 2003             Red Hat
 *  Copyright (C) 2003-2005, 2007  Bartlomiej Zolnierkiewicz
 */

/*
 *  Mostly written by Mark Lord <mlord@pobox.com>
 *                and Gadi Oxman <gadio@netvision.net.il>
 *                and Andre Hedrick <andre@linux-ide.org>
 *
 * 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 <linux/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(blk_rq_is_passthrough(rq));

        ledtrig_disk_activity();

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

        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 (req_op(rq) != REQ_OP_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_flags &= ~REQ_OP_MASK;
        rq->cmd_flags |= REQ_OP_DRV_OUT;
        ide_req(rq)->type = ATA_PRIV_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;

        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, REQ_OP_DRV_IN, __GFP_RECLAIM);
        ide_req(rq)->type = ATA_PRIV_TASKFILE;

        drive->mult_req = arg;
        drive->special_flags |= IDE_SFLAG_SET_MULTMODE;
        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;
        bool wc = false;

        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) {
                        wc = true;
                        blk_queue_prep_rq(drive->queue, idedisk_prep_fn);
                }
        }

        blk_queue_write_cache(drive->queue, wc, false);
}

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);
                queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, 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,
};