ide-floppy: start DMA engine in idefloppy_transfer_pc1()

[linux-2.6] / drivers / ide / ide-floppy.c

/*
 * IDE ATAPI floppy driver.
 *
 * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000-2002  Paul Bristow <paul@paulbristow.net>
 * Copyright (C) 2005       Bartlomiej Zolnierkiewicz
 *
 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
 * For a historical changelog see
 * Documentation/ide/ChangeLog.ide-floppy.1996-2002
 */

#define IDEFLOPPY_VERSION "1.00"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/delay.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/cdrom.h>
#include <linux/ide.h>
#include <linux/bitops.h>
#include <linux/mutex.h>

#include <scsi/scsi_ioctl.h>

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

/* define to see debug info */
#define IDEFLOPPY_DEBUG_LOG             0

/* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
#define IDEFLOPPY_DEBUG(fmt, args...)

#if IDEFLOPPY_DEBUG_LOG
#define debug_log(fmt, args...) \
        printk(KERN_INFO "ide-floppy: " fmt, ## args)
#else
#define debug_log(fmt, args...) do {} while (0)
#endif


/* Some drives require a longer irq timeout. */
#define IDEFLOPPY_WAIT_CMD              (5 * WAIT_CMD)

/*
 * After each failed packet command we issue a request sense command and retry
 * the packet command IDEFLOPPY_MAX_PC_RETRIES times.
 */
#define IDEFLOPPY_MAX_PC_RETRIES        3

/*
 * With each packet command, we allocate a buffer of IDEFLOPPY_PC_BUFFER_SIZE
 * bytes.
 */
#define IDEFLOPPY_PC_BUFFER_SIZE        256

/*
 * In various places in the driver, we need to allocate storage for packet
 * commands and requests, which will remain valid while we leave the driver to
 * wait for an interrupt or a timeout event.
 */
#define IDEFLOPPY_PC_STACK              (10 + IDEFLOPPY_MAX_PC_RETRIES)

/* format capacities descriptor codes */
#define CAPACITY_INVALID        0x00
#define CAPACITY_UNFORMATTED    0x01
#define CAPACITY_CURRENT        0x02
#define CAPACITY_NO_CARTRIDGE   0x03

/*
 * Most of our global data which we need to save even as we leave the driver
 * due to an interrupt or a timer event is stored in a variable of type
 * idefloppy_floppy_t, defined below.
 */
typedef struct ide_floppy_obj {
        ide_drive_t     *drive;
        ide_driver_t    *driver;
        struct gendisk  *disk;
        struct kref     kref;
        unsigned int    openers;        /* protected by BKL for now */

        /* Current packet command */
        struct ide_atapi_pc *pc;
        /* Last failed packet command */
        struct ide_atapi_pc *failed_pc;
        /* Packet command stack */
        struct ide_atapi_pc pc_stack[IDEFLOPPY_PC_STACK];
        /* Next free packet command storage space */
        int pc_stack_index;
        struct request rq_stack[IDEFLOPPY_PC_STACK];
        /* We implement a circular array */
        int rq_stack_index;

        /* Last error information */
        u8 sense_key, asc, ascq;
        /* delay this long before sending packet command */
        u8 ticks;
        int progress_indication;

        /* Device information */
        /* Current format */
        int blocks, block_size, bs_factor;
        /* Last format capacity descriptor */
        u8 cap_desc[8];
        /* Copy of the flexible disk page */
        u8 flexible_disk_page[32];
        /* Write protect */
        int wp;
        /* Supports format progress report */
        int srfp;
        /* Status/Action flags */
        unsigned long flags;
} idefloppy_floppy_t;

#define IDEFLOPPY_TICKS_DELAY   HZ/20   /* default delay for ZIP 100 (50ms) */

/* Floppy flag bits values. */
enum {
        /* DRQ interrupt device */
        IDEFLOPPY_FLAG_DRQ_INTERRUPT            = (1 << 0),
        /* Media may have changed */
        IDEFLOPPY_FLAG_MEDIA_CHANGED            = (1 << 1),
        /* Format in progress */
        IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS       = (1 << 2),
        /* Avoid commands not supported in Clik drive */
        IDEFLOPPY_FLAG_CLIK_DRIVE               = (1 << 3),
        /* Requires BH algorithm for packets */
        IDEFLOPPY_FLAG_ZIP_DRIVE                = (1 << 4),
};

/* Defines for the MODE SENSE command */
#define MODE_SENSE_CURRENT              0x00
#define MODE_SENSE_CHANGEABLE           0x01
#define MODE_SENSE_DEFAULT              0x02
#define MODE_SENSE_SAVED                0x03

/* IOCTLs used in low-level formatting. */
#define IDEFLOPPY_IOCTL_FORMAT_SUPPORTED        0x4600
#define IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY     0x4601
#define IDEFLOPPY_IOCTL_FORMAT_START            0x4602
#define IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS     0x4603

/* Error code returned in rq->errors to the higher part of the driver. */
#define IDEFLOPPY_ERROR_GENERAL         101

/*
 * Pages of the SELECT SENSE / MODE SENSE packet commands.
 * See SFF-8070i spec.
 */
#define IDEFLOPPY_CAPABILITIES_PAGE     0x1b
#define IDEFLOPPY_FLEXIBLE_DISK_PAGE    0x05

static DEFINE_MUTEX(idefloppy_ref_mutex);

#define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)

#define ide_floppy_g(disk) \
        container_of((disk)->private_data, struct ide_floppy_obj, driver)

static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
{
        struct ide_floppy_obj *floppy = NULL;

        mutex_lock(&idefloppy_ref_mutex);
        floppy = ide_floppy_g(disk);
        if (floppy)
                kref_get(&floppy->kref);
        mutex_unlock(&idefloppy_ref_mutex);
        return floppy;
}

static void idefloppy_cleanup_obj(struct kref *);

static void ide_floppy_put(struct ide_floppy_obj *floppy)
{
        mutex_lock(&idefloppy_ref_mutex);
        kref_put(&floppy->kref, idefloppy_cleanup_obj);
        mutex_unlock(&idefloppy_ref_mutex);
}

/*
 * Used to finish servicing a request. For read/write requests, we will call
 * ide_end_request to pass to the next buffer.
 */
static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct request *rq = HWGROUP(drive)->rq;
        int error;

        debug_log("Reached %s\n", __func__);

        switch (uptodate) {
        case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
        case 1: error = 0; break;
        default: error = uptodate;
        }
        if (error)
                floppy->failed_pc = NULL;
        /* Why does this happen? */
        if (!rq)
                return 0;
        if (!blk_special_request(rq)) {
                /* our real local end request function */
                ide_end_request(drive, uptodate, nsecs);
                return 0;
        }
        rq->errors = error;
        /* fixme: need to move this local also */
        ide_end_drive_cmd(drive, 0, 0);
        return 0;
}

static void ide_floppy_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
                                  unsigned int bcount, int direction)
{
        ide_hwif_t *hwif = drive->hwif;
        struct request *rq = pc->rq;
        struct req_iterator iter;
        struct bio_vec *bvec;
        unsigned long flags;
        int count, done = 0;
        char *data;

        rq_for_each_segment(bvec, rq, iter) {
                if (!bcount)
                        break;

                count = min(bvec->bv_len, bcount);

                data = bvec_kmap_irq(bvec, &flags);
                if (direction)
                        hwif->output_data(drive, NULL, data, count);
                else
                        hwif->input_data(drive, NULL, data, count);
                bvec_kunmap_irq(data, &flags);

                bcount -= count;
                pc->b_count += count;
                done += count;
        }

        idefloppy_end_request(drive, 1, done >> 9);

        if (bcount) {
                printk(KERN_ERR "%s: leftover data in %s, bcount == %d\n",
                                drive->name, __func__, bcount);
                ide_pad_transfer(drive, direction, bcount);
        }
}

static void idefloppy_update_buffers(ide_drive_t *drive,
                                struct ide_atapi_pc *pc)
{
        struct request *rq = pc->rq;
        struct bio *bio = rq->bio;

        while ((bio = rq->bio) != NULL)
                idefloppy_end_request(drive, 1, 0);
}

/*
 * Generate a new packet command request in front of the request queue, before
 * the current request so that it will be processed immediately, on the next
 * pass through the driver.
 */
static void idefloppy_queue_pc_head(ide_drive_t *drive, struct ide_atapi_pc *pc,
                struct request *rq)
{
        struct ide_floppy_obj *floppy = drive->driver_data;

        blk_rq_init(NULL, rq);
        rq->buffer = (char *) pc;
        rq->cmd_type = REQ_TYPE_SPECIAL;
        rq->cmd_flags |= REQ_PREEMPT;
        rq->rq_disk = floppy->disk;
        ide_do_drive_cmd(drive, rq);
}

static struct ide_atapi_pc *idefloppy_next_pc_storage(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        if (floppy->pc_stack_index == IDEFLOPPY_PC_STACK)
                floppy->pc_stack_index = 0;
        return (&floppy->pc_stack[floppy->pc_stack_index++]);
}

static struct request *idefloppy_next_rq_storage(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        if (floppy->rq_stack_index == IDEFLOPPY_PC_STACK)
                floppy->rq_stack_index = 0;
        return (&floppy->rq_stack[floppy->rq_stack_index++]);
}

static void ide_floppy_callback(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc *pc = floppy->pc;
        int uptodate = pc->error ? 0 : 1;

        debug_log("Reached %s\n", __func__);

        if (pc->c[0] == GPCMD_READ_10 || pc->c[0] == GPCMD_WRITE_10 ||
            (pc->rq && blk_pc_request(pc->rq)))
                uptodate = 1; /* FIXME */
        else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
                u8 *buf = floppy->pc->buf;

                if (!pc->error) {
                        floppy->sense_key = buf[2] & 0x0F;
                        floppy->asc = buf[12];
                        floppy->ascq = buf[13];
                        floppy->progress_indication = buf[15] & 0x80 ?
                                (u16)get_unaligned((u16 *)&buf[16]) : 0x10000;

                        if (floppy->failed_pc)
                                debug_log("pc = %x, ", floppy->failed_pc->c[0]);

                        debug_log("sense key = %x, asc = %x, ascq = %x\n",
                                  floppy->sense_key, floppy->asc, floppy->ascq);
                } else
                        printk(KERN_ERR "Error in REQUEST SENSE itself - "
                                        "Aborting request!\n");
        }

        idefloppy_end_request(drive, uptodate, 0);
}

static void idefloppy_init_pc(struct ide_atapi_pc *pc)
{
        memset(pc->c, 0, 12);
        pc->retries = 0;
        pc->flags = 0;
        pc->req_xfer = 0;
        pc->buf = pc->pc_buf;
        pc->buf_size = IDEFLOPPY_PC_BUFFER_SIZE;
        pc->callback = ide_floppy_callback;
}

static void idefloppy_create_request_sense_cmd(struct ide_atapi_pc *pc)
{
        idefloppy_init_pc(pc);
        pc->c[0] = GPCMD_REQUEST_SENSE;
        pc->c[4] = 255;
        pc->req_xfer = 18;
}

/*
 * Called when an error was detected during the last packet command. We queue a
 * request sense packet command in the head of the request list.
 */
static void idefloppy_retry_pc(ide_drive_t *drive)
{
        struct ide_atapi_pc *pc;
        struct request *rq;

        (void)ide_read_error(drive);
        pc = idefloppy_next_pc_storage(drive);
        rq = idefloppy_next_rq_storage(drive);
        idefloppy_create_request_sense_cmd(pc);
        idefloppy_queue_pc_head(drive, pc, rq);
}

/* The usual interrupt handler called during a packet command. */
static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        ide_hwif_t *hwif = drive->hwif;
        struct ide_atapi_pc *pc = floppy->pc;
        struct request *rq = pc->rq;
        xfer_func_t *xferfunc;
        unsigned int temp;
        int dma_error = 0;
        u16 bcount;
        u8 stat, ireason;

        debug_log("Reached %s interrupt handler\n", __func__);

        if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
                dma_error = hwif->dma_ops->dma_end(drive);
                if (dma_error) {
                        printk(KERN_ERR "%s: DMA %s error\n", drive->name,
                                        rq_data_dir(rq) ? "write" : "read");
                        pc->flags |= PC_FLAG_DMA_ERROR;
                } else {
                        pc->xferred = pc->req_xfer;
                        idefloppy_update_buffers(drive, pc);
                }
                debug_log("DMA finished\n");
        }

        /* Clear the interrupt */
        stat = ide_read_status(drive);

        /* No more interrupts */
        if ((stat & DRQ_STAT) == 0) {
                debug_log("Packet command completed, %d bytes transferred\n",
                                pc->xferred);
                pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;

                local_irq_enable_in_hardirq();

                if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR)) {
                        /* Error detected */
                        debug_log("%s: I/O error\n", drive->name);
                        rq->errors++;
                        if (pc->c[0] == GPCMD_REQUEST_SENSE) {
                                printk(KERN_ERR "%s: I/O error in request sense"
                                                " command\n", drive->name);
                                return ide_do_reset(drive);
                        }
                        /* Retry operation */
                        idefloppy_retry_pc(drive);
                        /* queued, but not started */
                        return ide_stopped;
                }
                pc->error = 0;
                if (floppy->failed_pc == pc)
                        floppy->failed_pc = NULL;
                /* Command finished - Call the callback function */
                pc->callback(drive);
                return ide_stopped;
        }

        if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
                pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
                printk(KERN_ERR "%s: The device wants to issue more interrupts "
                                "in DMA mode\n", drive->name);
                ide_dma_off(drive);
                return ide_do_reset(drive);
        }

        /* Get the number of bytes to transfer */
        bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
                  hwif->INB(hwif->io_ports.lbam_addr);
        /* on this interrupt */
        ireason = hwif->INB(hwif->io_ports.nsect_addr);

        if (ireason & CD) {
                printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
                return ide_do_reset(drive);
        }
        if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
                /* Hopefully, we will never get here */
                printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
                                "to %s!\n", drive->name,
                                (ireason & IO) ? "Write" : "Read",
                                (ireason & IO) ? "Read" : "Write");
                return ide_do_reset(drive);
        }
        if (!(pc->flags & PC_FLAG_WRITING)) {
                /* Reading - Check that we have enough space */
                temp = pc->xferred + bcount;
                if (temp > pc->req_xfer) {
                        if (temp > pc->buf_size) {
                                printk(KERN_ERR "%s: The device wants to send "
                                                "us more data than expected - "
                                                "discarding data\n",
                                                drive->name);
                                ide_pad_transfer(drive, 0, bcount);

                                ide_set_handler(drive,
                                                &idefloppy_pc_intr,
                                                IDEFLOPPY_WAIT_CMD,
                                                NULL);
                                return ide_started;
                        }
                        debug_log("The device wants to send us more data than "
                                  "expected - allowing transfer\n");
                }
        }
        if (pc->flags & PC_FLAG_WRITING)
                xferfunc = hwif->output_data;
        else
                xferfunc = hwif->input_data;

        if (pc->buf)
                xferfunc(drive, NULL, pc->cur_pos, bcount);
        else
                ide_floppy_io_buffers(drive, pc, bcount,
                                      !!(pc->flags & PC_FLAG_WRITING));

        /* Update the current position */
        pc->xferred += bcount;
        pc->cur_pos += bcount;

        /* And set the interrupt handler again */
        ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);
        return ide_started;
}

/*
 * What we have here is a classic case of a top half / bottom half interrupt
 * service routine. In interrupt mode, the device sends an interrupt to signal
 * that it is ready to receive a packet. However, we need to delay about 2-3
 * ticks before issuing the packet or we gets in trouble.
 *
 * So, follow carefully. transfer_pc1 is called as an interrupt (or directly).
 * In either case, when the device says it's ready for a packet, we schedule
 * the packet transfer to occur about 2-3 ticks later in transfer_pc2.
 */
static int idefloppy_transfer_pc2(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        /* Send the actual packet */
        drive->hwif->output_data(drive, NULL, floppy->pc->c, 12);

        /* Timeout for the packet command */
        return IDEFLOPPY_WAIT_CMD;
}

static ide_startstop_t idefloppy_transfer_pc1(ide_drive_t *drive)
{
        ide_hwif_t *hwif = drive->hwif;
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc *pc = floppy->pc;
        ide_expiry_t *expiry;
        unsigned int timeout;
        ide_startstop_t startstop;
        u8 ireason;

        if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
                printk(KERN_ERR "%s: Strange, packet command initiated yet "
                                "DRQ isn't asserted\n", drive->name);
                return startstop;
        }
        ireason = hwif->INB(hwif->io_ports.nsect_addr);
        if ((ireason & CD) == 0 || (ireason & IO)) {
                printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
                                "a packet command\n", drive->name);
                return ide_do_reset(drive);
        }
        /*
         * The following delay solves a problem with ATAPI Zip 100 drives
         * where the Busy flag was apparently being deasserted before the
         * unit was ready to receive data. This was happening on a
         * 1200 MHz Athlon system. 10/26/01 25msec is too short,
         * 40 and 50msec work well. idefloppy_pc_intr will not be actually
         * used until after the packet is moved in about 50 msec.
         */
        if (floppy->flags & IDEFLOPPY_FLAG_ZIP_DRIVE) {
                timeout = floppy->ticks;
                expiry = &idefloppy_transfer_pc2;
        } else {
                timeout = IDEFLOPPY_WAIT_CMD;
                expiry = NULL;
        }

        ide_set_handler(drive, &idefloppy_pc_intr, timeout, expiry);

        /* Begin DMA, if necessary */
        if (pc->flags & PC_FLAG_DMA_OK) {
                pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
                hwif->dma_ops->dma_start(drive);
        }

        if ((floppy->flags & IDEFLOPPY_FLAG_ZIP_DRIVE) == 0)
                /* Send the actual packet */
                hwif->output_data(drive, NULL, floppy->pc->c, 12);

        return ide_started;
}

static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
                                    struct ide_atapi_pc *pc)
{
        /* supress error messages resulting from Medium not present */
        if (floppy->sense_key == 0x02 &&
            floppy->asc       == 0x3a &&
            floppy->ascq      == 0x00)
                return;

        printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x, key = %2x, "
                        "asc = %2x, ascq = %2x\n",
                        floppy->drive->name, pc->c[0], floppy->sense_key,
                        floppy->asc, floppy->ascq);

}

static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
                struct ide_atapi_pc *pc)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        ide_hwif_t *hwif = drive->hwif;
        u16 bcount;
        u8 dma;

        if (floppy->failed_pc == NULL &&
            pc->c[0] != GPCMD_REQUEST_SENSE)
                floppy->failed_pc = pc;
        /* Set the current packet command */
        floppy->pc = pc;

        if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
                if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
                        ide_floppy_report_error(floppy, pc);
                /* Giving up */
                pc->error = IDEFLOPPY_ERROR_GENERAL;

                floppy->failed_pc = NULL;
                pc->callback(drive);
                return ide_stopped;
        }

        debug_log("Retry number - %d\n", pc->retries);

        pc->retries++;
        /* We haven't transferred any data yet */
        pc->xferred = 0;
        pc->cur_pos = pc->buf;
        bcount = min(pc->req_xfer, 63 * 1024);

        if (pc->flags & PC_FLAG_DMA_ERROR) {
                pc->flags &= ~PC_FLAG_DMA_ERROR;
                ide_dma_off(drive);
        }
        dma = 0;

        if ((pc->flags & PC_FLAG_DMA_OK) && drive->using_dma)
                dma = !hwif->dma_ops->dma_setup(drive);

        if (!dma)
                pc->flags &= ~PC_FLAG_DMA_OK;

        ide_pktcmd_tf_load(drive, IDE_TFLAG_OUT_DEVICE, bcount, dma);

        if (floppy->flags & IDEFLOPPY_FLAG_DRQ_INTERRUPT) {
                /* Issue the packet command */
                ide_execute_command(drive, WIN_PACKETCMD,
                                &idefloppy_transfer_pc1,
                                IDEFLOPPY_WAIT_CMD,
                                NULL);
                return ide_started;
        } else {
                /* Issue the packet command */
                ide_execute_pkt_cmd(drive);
                return idefloppy_transfer_pc1(drive);
        }
}

static void idefloppy_create_prevent_cmd(struct ide_atapi_pc *pc, int prevent)
{
        debug_log("creating prevent removal command, prevent = %d\n", prevent);

        idefloppy_init_pc(pc);
        pc->c[0] = GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL;
        pc->c[4] = prevent;
}

static void idefloppy_create_read_capacity_cmd(struct ide_atapi_pc *pc)
{
        idefloppy_init_pc(pc);
        pc->c[0] = GPCMD_READ_FORMAT_CAPACITIES;
        pc->c[7] = 255;
        pc->c[8] = 255;
        pc->req_xfer = 255;
}

static void idefloppy_create_format_unit_cmd(struct ide_atapi_pc *pc, int b,
                int l, int flags)
{
        idefloppy_init_pc(pc);
        pc->c[0] = GPCMD_FORMAT_UNIT;
        pc->c[1] = 0x17;

        memset(pc->buf, 0, 12);
        pc->buf[1] = 0xA2;
        /* Default format list header, u8 1: FOV/DCRT/IMM bits set */

        if (flags & 1)                          /* Verify bit on... */
                pc->buf[1] ^= 0x20;             /* ... turn off DCRT bit */
        pc->buf[3] = 8;

        put_unaligned(cpu_to_be32(b), (unsigned int *)(&pc->buf[4]));
        put_unaligned(cpu_to_be32(l), (unsigned int *)(&pc->buf[8]));
        pc->buf_size = 12;
        pc->flags |= PC_FLAG_WRITING;
}

/* A mode sense command is used to "sense" floppy parameters. */
static void idefloppy_create_mode_sense_cmd(struct ide_atapi_pc *pc,
                u8 page_code, u8 type)
{
        u16 length = 8; /* sizeof(Mode Parameter Header) = 8 Bytes */

        idefloppy_init_pc(pc);
        pc->c[0] = GPCMD_MODE_SENSE_10;
        pc->c[1] = 0;
        pc->c[2] = page_code + (type << 6);

        switch (page_code) {
        case IDEFLOPPY_CAPABILITIES_PAGE:
                length += 12;
                break;
        case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
                length += 32;
                break;
        default:
                printk(KERN_ERR "ide-floppy: unsupported page code "
                                "in create_mode_sense_cmd\n");
        }
        put_unaligned(cpu_to_be16(length), (u16 *) &pc->c[7]);
        pc->req_xfer = length;
}

static void idefloppy_create_start_stop_cmd(struct ide_atapi_pc *pc, int start)
{
        idefloppy_init_pc(pc);
        pc->c[0] = GPCMD_START_STOP_UNIT;
        pc->c[4] = start;
}

static void idefloppy_create_test_unit_ready_cmd(struct ide_atapi_pc *pc)
{
        idefloppy_init_pc(pc);
        pc->c[0] = GPCMD_TEST_UNIT_READY;
}

static void idefloppy_create_rw_cmd(idefloppy_floppy_t *floppy,
                                    struct ide_atapi_pc *pc, struct request *rq,
                                    unsigned long sector)
{
        int block = sector / floppy->bs_factor;
        int blocks = rq->nr_sectors / floppy->bs_factor;
        int cmd = rq_data_dir(rq);

        debug_log("create_rw10_cmd: block == %d, blocks == %d\n",
                block, blocks);

        idefloppy_init_pc(pc);
        pc->c[0] = cmd == READ ? GPCMD_READ_10 : GPCMD_WRITE_10;
        put_unaligned(cpu_to_be16(blocks), (unsigned short *)&pc->c[7]);
        put_unaligned(cpu_to_be32(block), (unsigned int *) &pc->c[2]);

        pc->rq = rq;
        pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
        if (rq->cmd_flags & REQ_RW)
                pc->flags |= PC_FLAG_WRITING;
        pc->buf = NULL;
        pc->req_xfer = pc->buf_size = blocks * floppy->block_size;
        pc->flags |= PC_FLAG_DMA_OK;
}

static void idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy,
                struct ide_atapi_pc *pc, struct request *rq)
{
        idefloppy_init_pc(pc);
        memcpy(pc->c, rq->cmd, sizeof(pc->c));
        pc->rq = rq;
        pc->b_count = rq->data_len;
        if (rq->data_len && rq_data_dir(rq) == WRITE)
                pc->flags |= PC_FLAG_WRITING;
        pc->buf = rq->data;
        if (rq->bio)
                pc->flags |= PC_FLAG_DMA_OK;
        /*
         * possibly problematic, doesn't look like ide-floppy correctly
         * handled scattered requests if dma fails...
         */
        pc->req_xfer = pc->buf_size = rq->data_len;
}

static ide_startstop_t idefloppy_do_request(ide_drive_t *drive,
                struct request *rq, sector_t block_s)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc *pc;
        unsigned long block = (unsigned long)block_s;

        debug_log("dev: %s, cmd_type: %x, errors: %d\n",
                        rq->rq_disk ? rq->rq_disk->disk_name : "?",
                        rq->cmd_type, rq->errors);
        debug_log("sector: %ld, nr_sectors: %ld, "
                        "current_nr_sectors: %d\n", (long)rq->sector,
                        rq->nr_sectors, rq->current_nr_sectors);

        if (rq->errors >= ERROR_MAX) {
                if (floppy->failed_pc)
                        ide_floppy_report_error(floppy, floppy->failed_pc);
                else
                        printk(KERN_ERR "ide-floppy: %s: I/O error\n",
                                drive->name);
                idefloppy_end_request(drive, 0, 0);
                return ide_stopped;
        }
        if (blk_fs_request(rq)) {
                if (((long)rq->sector % floppy->bs_factor) ||
                    (rq->nr_sectors % floppy->bs_factor)) {
                        printk(KERN_ERR "%s: unsupported r/w request size\n",
                                        drive->name);
                        idefloppy_end_request(drive, 0, 0);
                        return ide_stopped;
                }
                pc = idefloppy_next_pc_storage(drive);
                idefloppy_create_rw_cmd(floppy, pc, rq, block);
        } else if (blk_special_request(rq)) {
                pc = (struct ide_atapi_pc *) rq->buffer;
        } else if (blk_pc_request(rq)) {
                pc = idefloppy_next_pc_storage(drive);
                idefloppy_blockpc_cmd(floppy, pc, rq);
        } else {
                blk_dump_rq_flags(rq,
                        "ide-floppy: unsupported command in queue");
                idefloppy_end_request(drive, 0, 0);
                return ide_stopped;
        }

        pc->rq = rq;
        return idefloppy_issue_pc(drive, pc);
}

/*
 * Add a special packet command request to the tail of the request queue,
 * and wait for it to be serviced.
 */
static int idefloppy_queue_pc_tail(ide_drive_t *drive, struct ide_atapi_pc *pc)
{
        struct ide_floppy_obj *floppy = drive->driver_data;
        struct request *rq;
        int error;

        rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
        rq->buffer = (char *) pc;
        rq->cmd_type = REQ_TYPE_SPECIAL;
        error = blk_execute_rq(drive->queue, floppy->disk, rq, 0);
        blk_put_request(rq);

        return error;
}

/*
 * Look at the flexible disk page parameters. We ignore the CHS capacity
 * parameters and use the LBA parameters instead.
 */
static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc pc;
        u8 *page;
        int capacity, lba_capacity;
        u16 transfer_rate, sector_size, cyls, rpm;
        u8 heads, sectors;

        idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE,
                                        MODE_SENSE_CURRENT);

        if (idefloppy_queue_pc_tail(drive, &pc)) {
                printk(KERN_ERR "ide-floppy: Can't get flexible disk page"
                                " parameters\n");
                return 1;
        }
        floppy->wp = !!(pc.buf[3] & 0x80);
        set_disk_ro(floppy->disk, floppy->wp);
        page = &pc.buf[8];

        transfer_rate = be16_to_cpu(*(u16 *)&pc.buf[8 + 2]);
        sector_size   = be16_to_cpu(*(u16 *)&pc.buf[8 + 6]);
        cyls          = be16_to_cpu(*(u16 *)&pc.buf[8 + 8]);
        rpm           = be16_to_cpu(*(u16 *)&pc.buf[8 + 28]);
        heads         = pc.buf[8 + 4];
        sectors       = pc.buf[8 + 5];

        capacity = cyls * heads * sectors * sector_size;

        if (memcmp(page, &floppy->flexible_disk_page, 32))
                printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
                                "%d sector size, %d rpm\n",
                                drive->name, capacity / 1024, cyls, heads,
                                sectors, transfer_rate / 8, sector_size, rpm);

        memcpy(&floppy->flexible_disk_page, page, 32);
        drive->bios_cyl = cyls;
        drive->bios_head = heads;
        drive->bios_sect = sectors;
        lba_capacity = floppy->blocks * floppy->block_size;

        if (capacity < lba_capacity) {
                printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
                        "bytes, but the drive only handles %d\n",
                        drive->name, lba_capacity, capacity);
                floppy->blocks = floppy->block_size ?
                        capacity / floppy->block_size : 0;
        }
        return 0;
}

static int idefloppy_get_sfrp_bit(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc pc;

        floppy->srfp = 0;
        idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE,
                                                 MODE_SENSE_CURRENT);

        pc.flags |= PC_FLAG_SUPPRESS_ERROR;
        if (idefloppy_queue_pc_tail(drive, &pc))
                return 1;

        floppy->srfp = pc.buf[8 + 2] & 0x40;
        return (0);
}

/*
 * Determine if a media is present in the floppy drive, and if so, its LBA
 * capacity.
 */
static int ide_floppy_get_capacity(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc pc;
        u8 *cap_desc;
        u8 header_len, desc_cnt;
        int i, rc = 1, blocks, length;

        drive->bios_cyl = 0;
        drive->bios_head = drive->bios_sect = 0;
        floppy->blocks = 0;
        floppy->bs_factor = 1;
        set_capacity(floppy->disk, 0);

        idefloppy_create_read_capacity_cmd(&pc);
        if (idefloppy_queue_pc_tail(drive, &pc)) {
                printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
                return 1;
        }
        header_len = pc.buf[3];
        cap_desc = &pc.buf[4];
        desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

        for (i = 0; i < desc_cnt; i++) {
                unsigned int desc_start = 4 + i*8;

                blocks = be32_to_cpu(*(u32 *)&pc.buf[desc_start]);
                length = be16_to_cpu(*(u16 *)&pc.buf[desc_start + 6]);

                debug_log("Descriptor %d: %dkB, %d blocks, %d sector size\n",
                                i, blocks * length / 1024, blocks, length);

                if (i)
                        continue;
                /*
                 * the code below is valid only for the 1st descriptor, ie i=0
                 */

                switch (pc.buf[desc_start + 4] & 0x03) {
                /* Clik! drive returns this instead of CAPACITY_CURRENT */
                case CAPACITY_UNFORMATTED:
                        if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
                                /*
                                 * If it is not a clik drive, break out
                                 * (maintains previous driver behaviour)
                                 */
                                break;
                case CAPACITY_CURRENT:
                        /* Normal Zip/LS-120 disks */
                        if (memcmp(cap_desc, &floppy->cap_desc, 8))
                                printk(KERN_INFO "%s: %dkB, %d blocks, %d "
                                        "sector size\n", drive->name,
                                        blocks * length / 1024, blocks, length);
                        memcpy(&floppy->cap_desc, cap_desc, 8);

                        if (!length || length % 512) {
                                printk(KERN_NOTICE "%s: %d bytes block size "
                                        "not supported\n", drive->name, length);
                        } else {
                                floppy->blocks = blocks;
                                floppy->block_size = length;
                                floppy->bs_factor = length / 512;
                                if (floppy->bs_factor != 1)
                                        printk(KERN_NOTICE "%s: warning: non "
                                                "512 bytes block size not "
                                                "fully supported\n",
                                                drive->name);
                                rc = 0;
                        }
                        break;
                case CAPACITY_NO_CARTRIDGE:
                        /*
                         * This is a KERN_ERR so it appears on screen
                         * for the user to see
                         */
                        printk(KERN_ERR "%s: No disk in drive\n", drive->name);
                        break;
                case CAPACITY_INVALID:
                        printk(KERN_ERR "%s: Invalid capacity for disk "
                                "in drive\n", drive->name);
                        break;
                }
                debug_log("Descriptor 0 Code: %d\n",
                          pc.buf[desc_start + 4] & 0x03);
        }

        /* Clik! disk does not support get_flexible_disk_page */
        if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE))
                (void) ide_floppy_get_flexible_disk_page(drive);

        set_capacity(floppy->disk, floppy->blocks * floppy->bs_factor);
        return rc;
}

/*
 * Obtain the list of formattable capacities.
 * Very similar to ide_floppy_get_capacity, except that we push the capacity
 * descriptors to userland, instead of our own structures.
 *
 * Userland gives us the following structure:
 *
 * struct idefloppy_format_capacities {
 *      int nformats;
 *      struct {
 *              int nblocks;
 *              int blocksize;
 *      } formats[];
 * };
 *
 * userland initializes nformats to the number of allocated formats[] records.
 * On exit we set nformats to the number of records we've actually initialized.
 */

static int ide_floppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
{
        struct ide_atapi_pc pc;
        u8 header_len, desc_cnt;
        int i, blocks, length, u_array_size, u_index;
        int __user *argp;

        if (get_user(u_array_size, arg))
                return (-EFAULT);

        if (u_array_size <= 0)
                return (-EINVAL);

        idefloppy_create_read_capacity_cmd(&pc);
        if (idefloppy_queue_pc_tail(drive, &pc)) {
                printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
                return (-EIO);
        }
        header_len = pc.buf[3];
        desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

        u_index = 0;
        argp = arg + 1;

        /*
         * We always skip the first capacity descriptor.  That's the current
         * capacity.  We are interested in the remaining descriptors, the
         * formattable capacities.
         */
        for (i = 1; i < desc_cnt; i++) {
                unsigned int desc_start = 4 + i*8;

                if (u_index >= u_array_size)
                        break;  /* User-supplied buffer too small */

                blocks = be32_to_cpu(*(u32 *)&pc.buf[desc_start]);
                length = be16_to_cpu(*(u16 *)&pc.buf[desc_start + 6]);

                if (put_user(blocks, argp))
                        return(-EFAULT);
                ++argp;

                if (put_user(length, argp))
                        return (-EFAULT);
                ++argp;

                ++u_index;
        }

        if (put_user(u_index, arg))
                return (-EFAULT);
        return (0);
}

/*
 * Get ATAPI_FORMAT_UNIT progress indication.
 *
 * Userland gives a pointer to an int.  The int is set to a progress
 * indicator 0-65536, with 65536=100%.
 *
 * If the drive does not support format progress indication, we just check
 * the dsc bit, and return either 0 or 65536.
 */

static int idefloppy_get_format_progress(ide_drive_t *drive, int __user *arg)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct ide_atapi_pc pc;
        int progress_indication = 0x10000;

        if (floppy->srfp) {
                idefloppy_create_request_sense_cmd(&pc);
                if (idefloppy_queue_pc_tail(drive, &pc))
                        return (-EIO);

                if (floppy->sense_key == 2 &&
                    floppy->asc == 4 &&
                    floppy->ascq == 4)
                        progress_indication = floppy->progress_indication;

                /* Else assume format_unit has finished, and we're at 0x10000 */
        } else {
                unsigned long flags;
                u8 stat;

                local_irq_save(flags);
                stat = ide_read_status(drive);
                local_irq_restore(flags);

                progress_indication = ((stat & SEEK_STAT) == 0) ? 0 : 0x10000;
        }
        if (put_user(progress_indication, arg))
                return (-EFAULT);

        return (0);
}

static sector_t idefloppy_capacity(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        unsigned long capacity = floppy->blocks * floppy->bs_factor;

        return capacity;
}

/*
 * Check whether we can support a drive, based on the ATAPI IDENTIFY command
 * results.
 */
static int idefloppy_identify_device(ide_drive_t *drive, struct hd_driveid *id)
{
        u8 gcw[2];
        u8 device_type, protocol, removable, drq_type, packet_size;

        *((u16 *) &gcw) = id->config;

        device_type =  gcw[1] & 0x1F;
        removable   = (gcw[0] & 0x80) >> 7;
        protocol    = (gcw[1] & 0xC0) >> 6;
        drq_type    = (gcw[0] & 0x60) >> 5;
        packet_size =  gcw[0] & 0x03;

#ifdef CONFIG_PPC
        /* kludge for Apple PowerBook internal zip */
        if (device_type == 5 &&
            !strstr(id->model, "CD-ROM") && strstr(id->model, "ZIP"))
                device_type = 0;
#endif

        if (protocol != 2)
                printk(KERN_ERR "ide-floppy: Protocol (0x%02x) is not ATAPI\n",
                        protocol);
        else if (device_type != 0)
                printk(KERN_ERR "ide-floppy: Device type (0x%02x) is not set "
                                "to floppy\n", device_type);
        else if (!removable)
                printk(KERN_ERR "ide-floppy: The removable flag is not set\n");
        else if (drq_type == 3)
                printk(KERN_ERR "ide-floppy: Sorry, DRQ type (0x%02x) not "
                                "supported\n", drq_type);
        else if (packet_size != 0)
                printk(KERN_ERR "ide-floppy: Packet size (0x%02x) is not 12 "
                                "bytes\n", packet_size);
        else
                return 1;
        return 0;
}

#ifdef CONFIG_IDE_PROC_FS
static void idefloppy_add_settings(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        ide_add_setting(drive, "bios_cyl", SETTING_RW, TYPE_INT, 0, 1023, 1, 1,
                        &drive->bios_cyl, NULL);
        ide_add_setting(drive, "bios_head", SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
                        &drive->bios_head, NULL);
        ide_add_setting(drive, "bios_sect", SETTING_RW, TYPE_BYTE, 0,  63, 1, 1,
                        &drive->bios_sect, NULL);
        ide_add_setting(drive, "ticks",    SETTING_RW, TYPE_BYTE, 0, 255, 1, 1,
                        &floppy->ticks,  NULL);
}
#else
static inline void idefloppy_add_settings(ide_drive_t *drive) { ; }
#endif

static void idefloppy_setup(ide_drive_t *drive, idefloppy_floppy_t *floppy)
{
        u8 gcw[2];

        *((u16 *) &gcw) = drive->id->config;
        floppy->pc = floppy->pc_stack;

        if (((gcw[0] & 0x60) >> 5) == 1)
                floppy->flags |= IDEFLOPPY_FLAG_DRQ_INTERRUPT;
        /*
         * We used to check revisions here. At this point however I'm giving up.
         * Just assume they are all broken, its easier.
         *
         * The actual reason for the workarounds was likely a driver bug after
         * all rather than a firmware bug, and the workaround below used to hide
         * it. It should be fixed as of version 1.9, but to be on the safe side
         * we'll leave the limitation below for the 2.2.x tree.
         */
        if (!strncmp(drive->id->model, "IOMEGA ZIP 100 ATAPI", 20)) {
                floppy->flags |= IDEFLOPPY_FLAG_ZIP_DRIVE;
                /* This value will be visible in the /proc/ide/hdx/settings */
                floppy->ticks = IDEFLOPPY_TICKS_DELAY;
                blk_queue_max_sectors(drive->queue, 64);
        }

        /*
         * Guess what? The IOMEGA Clik! drive also needs the above fix. It makes
         * nasty clicking noises without it, so please don't remove this.
         */
        if (strncmp(drive->id->model, "IOMEGA Clik!", 11) == 0) {
                blk_queue_max_sectors(drive->queue, 64);
                floppy->flags |= IDEFLOPPY_FLAG_CLIK_DRIVE;
        }

        (void) ide_floppy_get_capacity(drive);
        idefloppy_add_settings(drive);
}

static void ide_floppy_remove(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct gendisk *g = floppy->disk;

        ide_proc_unregister_driver(drive, floppy->driver);

        del_gendisk(g);

        ide_floppy_put(floppy);
}

static void idefloppy_cleanup_obj(struct kref *kref)
{
        struct ide_floppy_obj *floppy = to_ide_floppy(kref);
        ide_drive_t *drive = floppy->drive;
        struct gendisk *g = floppy->disk;

        drive->driver_data = NULL;
        g->private_data = NULL;
        put_disk(g);
        kfree(floppy);
}

#ifdef CONFIG_IDE_PROC_FS
static int proc_idefloppy_read_capacity(char *page, char **start, off_t off,
                int count, int *eof, void *data)
{
        ide_drive_t*drive = (ide_drive_t *)data;
        int len;

        len = sprintf(page, "%llu\n", (long long)idefloppy_capacity(drive));
        PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}

static ide_proc_entry_t idefloppy_proc[] = {
        { "capacity",   S_IFREG|S_IRUGO, proc_idefloppy_read_capacity,  NULL },
        { "geometry",   S_IFREG|S_IRUGO, proc_ide_read_geometry,        NULL },
        { NULL, 0, NULL, NULL }
};
#endif  /* CONFIG_IDE_PROC_FS */

static int ide_floppy_probe(ide_drive_t *);

static ide_driver_t idefloppy_driver = {
        .gen_driver = {
                .owner          = THIS_MODULE,
                .name           = "ide-floppy",
                .bus            = &ide_bus_type,
        },
        .probe                  = ide_floppy_probe,
        .remove                 = ide_floppy_remove,
        .version                = IDEFLOPPY_VERSION,
        .media                  = ide_floppy,
        .supports_dsc_overlap   = 0,
        .do_request             = idefloppy_do_request,
        .end_request            = idefloppy_end_request,
        .error                  = __ide_error,
        .abort                  = __ide_abort,
#ifdef CONFIG_IDE_PROC_FS
        .proc                   = idefloppy_proc,
#endif
};

static int idefloppy_open(struct inode *inode, struct file *filp)
{
        struct gendisk *disk = inode->i_bdev->bd_disk;
        struct ide_floppy_obj *floppy;
        ide_drive_t *drive;
        struct ide_atapi_pc pc;
        int ret = 0;

        debug_log("Reached %s\n", __func__);

        floppy = ide_floppy_get(disk);
        if (!floppy)
                return -ENXIO;

        drive = floppy->drive;

        floppy->openers++;

        if (floppy->openers == 1) {
                floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
                /* Just in case */

                idefloppy_create_test_unit_ready_cmd(&pc);
                if (idefloppy_queue_pc_tail(drive, &pc)) {
                        idefloppy_create_start_stop_cmd(&pc, 1);
                        (void) idefloppy_queue_pc_tail(drive, &pc);
                }

                if (ide_floppy_get_capacity(drive)
                   && (filp->f_flags & O_NDELAY) == 0
                    /*
                     * Allow O_NDELAY to open a drive without a disk, or with an
                     * unreadable disk, so that we can get the format capacity
                     * of the drive or begin the format - Sam
                     */
                    ) {
                        ret = -EIO;
                        goto out_put_floppy;
                }

                if (floppy->wp && (filp->f_mode & 2)) {
                        ret = -EROFS;
                        goto out_put_floppy;
                }
                floppy->flags |= IDEFLOPPY_FLAG_MEDIA_CHANGED;
                /* IOMEGA Clik! drives do not support lock/unlock commands */
                if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
                        idefloppy_create_prevent_cmd(&pc, 1);
                        (void) idefloppy_queue_pc_tail(drive, &pc);
                }
                check_disk_change(inode->i_bdev);
        } else if (floppy->flags & IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS) {
                ret = -EBUSY;
                goto out_put_floppy;
        }
        return 0;

out_put_floppy:
        floppy->openers--;
        ide_floppy_put(floppy);
        return ret;
}

static int idefloppy_release(struct inode *inode, struct file *filp)
{
        struct gendisk *disk = inode->i_bdev->bd_disk;
        struct ide_floppy_obj *floppy = ide_floppy_g(disk);
        ide_drive_t *drive = floppy->drive;
        struct ide_atapi_pc pc;

        debug_log("Reached %s\n", __func__);

        if (floppy->openers == 1) {
                /* IOMEGA Clik! drives do not support lock/unlock commands */
                if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
                        idefloppy_create_prevent_cmd(&pc, 0);
                        (void) idefloppy_queue_pc_tail(drive, &pc);
                }

                floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
        }

        floppy->openers--;

        ide_floppy_put(floppy);

        return 0;
}

static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
{
        struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
        ide_drive_t *drive = floppy->drive;

        geo->heads = drive->bios_head;
        geo->sectors = drive->bios_sect;
        geo->cylinders = (u16)drive->bios_cyl; /* truncate */
        return 0;
}

static int ide_floppy_lockdoor(idefloppy_floppy_t *floppy,
                struct ide_atapi_pc *pc, unsigned long arg, unsigned int cmd)
{
        if (floppy->openers > 1)
                return -EBUSY;

        /* The IOMEGA Clik! Drive doesn't support this command -
         * no room for an eject mechanism */
        if (!(floppy->flags & IDEFLOPPY_FLAG_CLIK_DRIVE)) {
                int prevent = arg ? 1 : 0;

                if (cmd == CDROMEJECT)
                        prevent = 0;

                idefloppy_create_prevent_cmd(pc, prevent);
                (void) idefloppy_queue_pc_tail(floppy->drive, pc);
        }

        if (cmd == CDROMEJECT) {
                idefloppy_create_start_stop_cmd(pc, 2);
                (void) idefloppy_queue_pc_tail(floppy->drive, pc);
        }

        return 0;
}

static int ide_floppy_format_unit(idefloppy_floppy_t *floppy,
                                  int __user *arg)
{
        int blocks, length, flags, err = 0;
        struct ide_atapi_pc pc;

        if (floppy->openers > 1) {
                /* Don't format if someone is using the disk */
                floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
                return -EBUSY;
        }

        floppy->flags |= IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;

        /*
         * Send ATAPI_FORMAT_UNIT to the drive.
         *
         * Userland gives us the following structure:
         *
         * struct idefloppy_format_command {
         *        int nblocks;
         *        int blocksize;
         *        int flags;
         *        } ;
         *
         * flags is a bitmask, currently, the only defined flag is:
         *
         *        0x01 - verify media after format.
         */
        if (get_user(blocks, arg) ||
                        get_user(length, arg+1) ||
                        get_user(flags, arg+2)) {
                err = -EFAULT;
                goto out;
        }

        (void) idefloppy_get_sfrp_bit(floppy->drive);
        idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);

        if (idefloppy_queue_pc_tail(floppy->drive, &pc))
                err = -EIO;

out:
        if (err)
                floppy->flags &= ~IDEFLOPPY_FLAG_FORMAT_IN_PROGRESS;
        return err;
}


static int idefloppy_ioctl(struct inode *inode, struct file *file,
                        unsigned int cmd, unsigned long arg)
{
        struct block_device *bdev = inode->i_bdev;
        struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
        ide_drive_t *drive = floppy->drive;
        struct ide_atapi_pc pc;
        void __user *argp = (void __user *)arg;
        int err;

        switch (cmd) {
        case CDROMEJECT:
                /* fall through */
        case CDROM_LOCKDOOR:
                return ide_floppy_lockdoor(floppy, &pc, arg, cmd);
        case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
                return 0;
        case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
                return ide_floppy_get_format_capacities(drive, argp);
        case IDEFLOPPY_IOCTL_FORMAT_START:
                if (!(file->f_mode & 2))
                        return -EPERM;

                return ide_floppy_format_unit(floppy, (int __user *)arg);
        case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
                return idefloppy_get_format_progress(drive, argp);
        }

        /*
         * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
         * and CDROM_SEND_PACKET (legacy) ioctls
         */
        if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
                err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
                                        bdev->bd_disk, cmd, argp);
        else
                err = -ENOTTY;

        if (err == -ENOTTY)
                err = generic_ide_ioctl(drive, file, bdev, cmd, arg);

        return err;
}

static int idefloppy_media_changed(struct gendisk *disk)
{
        struct ide_floppy_obj *floppy = ide_floppy_g(disk);
        ide_drive_t *drive = floppy->drive;
        int ret;

        /* do not scan partitions twice if this is a removable device */
        if (drive->attach) {
                drive->attach = 0;
                return 0;
        }
        ret = !!(floppy->flags & IDEFLOPPY_FLAG_MEDIA_CHANGED);
        floppy->flags &= ~IDEFLOPPY_FLAG_MEDIA_CHANGED;
        return ret;
}

static int idefloppy_revalidate_disk(struct gendisk *disk)
{
        struct ide_floppy_obj *floppy = ide_floppy_g(disk);
        set_capacity(disk, idefloppy_capacity(floppy->drive));
        return 0;
}

static struct block_device_operations idefloppy_ops = {
        .owner                  = THIS_MODULE,
        .open                   = idefloppy_open,
        .release                = idefloppy_release,
        .ioctl                  = idefloppy_ioctl,
        .getgeo                 = idefloppy_getgeo,
        .media_changed          = idefloppy_media_changed,
        .revalidate_disk        = idefloppy_revalidate_disk
};

static int ide_floppy_probe(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy;
        struct gendisk *g;

        if (!strstr("ide-floppy", drive->driver_req))
                goto failed;
        if (!drive->present)
                goto failed;
        if (drive->media != ide_floppy)
                goto failed;
        if (!idefloppy_identify_device(drive, drive->id)) {
                printk(KERN_ERR "ide-floppy: %s: not supported by this version"
                                " of ide-floppy\n", drive->name);
                goto failed;
        }
        if (drive->scsi) {
                printk(KERN_INFO "ide-floppy: passing drive %s to ide-scsi"
                                " emulation.\n", drive->name);
                goto failed;
        }
        floppy = kzalloc(sizeof(idefloppy_floppy_t), GFP_KERNEL);
        if (!floppy) {
                printk(KERN_ERR "ide-floppy: %s: Can't allocate a floppy"
                                " structure\n", drive->name);
                goto failed;
        }

        g = alloc_disk(1 << PARTN_BITS);
        if (!g)
                goto out_free_floppy;

        ide_init_disk(g, drive);

        ide_proc_register_driver(drive, &idefloppy_driver);

        kref_init(&floppy->kref);

        floppy->drive = drive;
        floppy->driver = &idefloppy_driver;
        floppy->disk = g;

        g->private_data = &floppy->driver;

        drive->driver_data = floppy;

        idefloppy_setup(drive, floppy);

        g->minors = 1 << PARTN_BITS;
        g->driverfs_dev = &drive->gendev;
        g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
        g->fops = &idefloppy_ops;
        drive->attach = 1;
        add_disk(g);
        return 0;

out_free_floppy:
        kfree(floppy);
failed:
        return -ENODEV;
}

static void __exit idefloppy_exit(void)
{
        driver_unregister(&idefloppy_driver.gen_driver);
}

static int __init idefloppy_init(void)
{
        printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
        return driver_register(&idefloppy_driver.gen_driver);
}

MODULE_ALIAS("ide:*m-floppy*");
module_init(idefloppy_init);
module_exit(idefloppy_exit);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ATAPI FLOPPY Driver");