/*
 * linux/drivers/ide/ide-floppy.c       Version 0.99    Feb 24 2002
 *
 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
 * Copyright (C) 2000 - 2002 Paul Bristow <paul@paulbristow.net>
 */

/*
 * IDE ATAPI floppy driver.
 *
 * The driver currently doesn't have any fancy features, just the bare
 * minimum read/write support.
 *
 * This driver supports the following IDE floppy drives:
 *
 * LS-120/240 SuperDisk
 * Iomega Zip 100/250
 * Iomega PC Card Clik!/PocketZip
 *
 * Many thanks to Lode Leroy <Lode.Leroy@www.ibase.be>, who tested so many
 * ALPHA patches to this driver on an EASYSTOR LS-120 ATAPI floppy drive.
 *
 * Ver 0.1   Oct 17 96   Initial test version, mostly based on ide-tape.c.
 * Ver 0.2   Oct 31 96   Minor changes.
 * Ver 0.3   Dec  2 96   Fixed error recovery bug.
 * Ver 0.4   Jan 26 97   Add support for the HDIO_GETGEO ioctl.
 * Ver 0.5   Feb 21 97   Add partitions support.
 *                       Use the minimum of the LBA and CHS capacities.
 *                       Avoid hwgroup->rq == NULL on the last irq.
 *                       Fix potential null dereferencing with DEBUG_LOG.
 * Ver 0.8   Dec  7 97   Increase irq timeout from 10 to 50 seconds.
 *                       Add media write-protect detection.
 *                       Issue START command only if TEST UNIT READY fails.
 *                       Add work-around for IOMEGA ZIP revision 21.D.
 *                       Remove idefloppy_get_capabilities().
 * Ver 0.9   Jul  4 99   Fix a bug which might have caused the number of
 *                        bytes requested on each interrupt to be zero.
 *                        Thanks to <shanos@es.co.nz> for pointing this out.
 * Ver 0.9.sv Jan 6 01   Sam Varshavchik <mrsam@courier-mta.com>
 *                       Implement low level formatting.  Reimplemented
 *                       IDEFLOPPY_CAPABILITIES_PAGE, since we need the srfp
 *                       bit.  My LS-120 drive barfs on
 *                       IDEFLOPPY_CAPABILITIES_PAGE, but maybe it's just me.
 *                       Compromise by not reporting a failure to get this
 *                       mode page.  Implemented four IOCTLs in order to
 *                       implement formatting.  IOCTls begin with 0x4600,
 *                       0x46 is 'F' as in Format.
 *            Jan 9 01   Userland option to select format verify.
 *                       Added PC_SUPPRESS_ERROR flag - some idefloppy drives
 *                       do not implement IDEFLOPPY_CAPABILITIES_PAGE, and
 *                       return a sense error.  Suppress error reporting in
 *                       this particular case in order to avoid spurious
 *                       errors in syslog.  The culprit is
 *                       idefloppy_get_capability_page(), so move it to
 *                       idefloppy_begin_format() so that it's not used
 *                       unless absolutely necessary.
 *                       If drive does not support format progress indication
 *                       monitor the dsc bit in the status register.
 *                       Also, O_NDELAY on open will allow the device to be
 *                       opened without a disk available.  This can be used to
 *                       open an unformatted disk, or get the device capacity.
 * Ver 0.91  Dec 11 99   Added IOMEGA Clik! drive support by 
 *                 <paul@paulbristow.net>
 * Ver 0.92  Oct 22 00   Paul Bristow became official maintainer for this 
 *                         driver.  Included Powerbook internal zip kludge.
 * Ver 0.93  Oct 24 00   Fixed bugs for Clik! drive
 *                        no disk on insert and disk change now works
 * Ver 0.94  Oct 27 00   Tidied up to remove strstr(Clik) everywhere
 * Ver 0.95  Nov  7 00   Brought across to kernel 2.4
 * Ver 0.96  Jan  7 01   Actually in line with release version of 2.4.0
 *                       including set_bit patch from Rusty Russell
 * Ver 0.97  Jul 22 01   Merge 0.91-0.96 onto 0.9.sv for ac series
 * Ver 0.97.sv Aug 3 01  Backported from 2.4.7-ac3
 * Ver 0.98  Oct 26 01   Split idefloppy_transfer_pc into two pieces to
 *                        fix a lost interrupt problem. It appears the busy
 *                        bit was being deasserted by my IOMEGA ATAPI ZIP 100
 *                        drive before the drive was actually ready.
 * Ver 0.98a Oct 29 01   Expose delay value so we can play.
 * Ver 0.99  Feb 24 02   Remove duplicate code, modify clik! detection code 
 *                        to support new PocketZip drives 
 */

#define IDEFLOPPY_VERSION "0.99.newide"

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

/*
 *      The following are used to debug the driver.
 */
#define IDEFLOPPY_DEBUG_LOG             0
#define IDEFLOPPY_DEBUG_INFO            0
#define IDEFLOPPY_DEBUG_BUGS            1

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


/*
 *      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)

/*
 *      Our view of a packet command.
 */
typedef struct idefloppy_packet_command_s {
        u8 c[12];                               /* Actual packet bytes */
        int retries;                            /* On each retry, we increment retries */
        int error;                              /* Error code */
        int request_transfer;                   /* Bytes to transfer */
        int actually_transferred;               /* Bytes actually transferred */
        int buffer_size;                        /* Size of our data buffer */
        char *b_data;                           /* Pointer which runs on the buffers */
        int b_count;                            /* Missing/Available data on the current buffer */
        struct request *rq;                     /* The corresponding request */
        u8 *buffer;                             /* Data buffer */
        u8 *current_position;                   /* Pointer into the above buffer */
        void (*callback) (ide_drive_t *);       /* Called when this packet command is completed */
        u8 pc_buffer[IDEFLOPPY_PC_BUFFER_SIZE]; /* Temporary buffer */
        unsigned long flags;                    /* Status/Action bit flags: long for set_bit */
} idefloppy_pc_t;

/*
 *      Packet command flag bits.
 */
#define PC_ABORT                        0       /* Set when an error is considered normal - We won't retry */
#define PC_DMA_RECOMMENDED              2       /* 1 when we prefer to use DMA if possible */
#define PC_DMA_IN_PROGRESS              3       /* 1 while DMA in progress */
#define PC_DMA_ERROR                    4       /* 1 when encountered problem during DMA */
#define PC_WRITING                      5       /* Data direction */

#define PC_SUPPRESS_ERROR               6       /* Suppress error reporting */

/*
 *      Removable Block Access Capabilities Page
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        page_code       :6;     /* Page code - Should be 0x1b */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        ps              :1;     /* Should be 0 */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        ps              :1;     /* Should be 0 */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        page_code       :6;     /* Page code - Should be 0x1b */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              page_length;            /* Page Length - Should be 0xa */
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        reserved2       :6;
        unsigned        srfp            :1;     /* Supports reporting progress of format */
        unsigned        sflp            :1;     /* System floppy type device */
        unsigned        tlun            :3;     /* Total logical units supported by the device */
        unsigned        reserved3       :3;
        unsigned        sml             :1;     /* Single / Multiple lun supported */
        unsigned        ncd             :1;     /* Non cd optical device */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        sflp            :1;     /* System floppy type device */
        unsigned        srfp            :1;     /* Supports reporting progress of format */
        unsigned        reserved2       :6;
        unsigned        ncd             :1;     /* Non cd optical device */
        unsigned        sml             :1;     /* Single / Multiple lun supported */
        unsigned        reserved3       :3;
        unsigned        tlun            :3;     /* Total logical units supported by the device */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              reserved[8];
} idefloppy_capabilities_page_t;

/*
 *      Flexible disk page.
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        page_code       :6;     /* Page code - Should be 0x5 */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        ps              :1;     /* The device is capable of saving the page */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        ps              :1;     /* The device is capable of saving the page */
        unsigned        reserved1_6     :1;     /* Reserved */
        unsigned        page_code       :6;     /* Page code - Should be 0x5 */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              page_length;            /* Page Length - Should be 0x1e */
        u16             transfer_rate;          /* In kilobits per second */
        u8              heads, sectors;         /* Number of heads, Number of sectors per track */
        u16             sector_size;            /* Byes per sector */
        u16             cyls;                   /* Number of cylinders */
        u8              reserved10[10];
        u8              motor_delay;            /* Motor off delay */
        u8              reserved21[7];
        u16             rpm;                    /* Rotations per minute */
        u8              reserved30[2];
} idefloppy_flexible_disk_page_t;
 
/*
 *      Format capacity
 */
typedef struct {
        u8              reserved[3];
        u8              length;                 /* Length of the following descriptors in bytes */
} idefloppy_capacity_header_t;

typedef struct {
        u32             blocks;                 /* Number of blocks */
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        dc              :2;     /* Descriptor Code */
        unsigned        reserved        :6;
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        reserved        :6;
        unsigned        dc              :2;     /* Descriptor Code */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              length_msb;             /* Block Length (MSB)*/
        u16             length;                 /* Block Length */
} idefloppy_capacity_descriptor_t;

#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_drive_t *drive;

        /* Current packet command */
        idefloppy_pc_t *pc;
        /* Last failed packet command */
        idefloppy_pc_t *failed_pc;
        /* Packet command stack */
        idefloppy_pc_t 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 */
        idefloppy_capacity_descriptor_t capacity;
        /* Copy of the flexible disk page */
        idefloppy_flexible_disk_page_t flexible_disk_page;
        /* Write protect */
        int wp;
        /* Supports format progress report */
        int srfp;
        /* Status/Action flags */
        unsigned long flags;
} idefloppy_floppy_t;

#define IDEFLOPPY_TICKS_DELAY   3       /* default delay for ZIP 100 */

/*
 *      Floppy flag bits values.
 */
#define IDEFLOPPY_DRQ_INTERRUPT         0       /* DRQ interrupt device */
#define IDEFLOPPY_MEDIA_CHANGED         1       /* Media may have changed */
#define IDEFLOPPY_USE_READ12            2       /* Use READ12/WRITE12 or READ10/WRITE10 */
#define IDEFLOPPY_FORMAT_IN_PROGRESS    3       /* Format in progress */
#define IDEFLOPPY_CLIK_DRIVE            4       /* Avoid commands not supported in Clik drive */
#define IDEFLOPPY_ZIP_DRIVE             5       /* Requires BH algorithm for packets */

/*
 *      ATAPI floppy drive packet commands
 */
#define IDEFLOPPY_FORMAT_UNIT_CMD       0x04
#define IDEFLOPPY_INQUIRY_CMD           0x12
#define IDEFLOPPY_MODE_SELECT_CMD       0x55
#define IDEFLOPPY_MODE_SENSE_CMD        0x5a
#define IDEFLOPPY_READ10_CMD            0x28
#define IDEFLOPPY_READ12_CMD            0xa8
#define IDEFLOPPY_READ_CAPACITY_CMD     0x23
#define IDEFLOPPY_REQUEST_SENSE_CMD     0x03
#define IDEFLOPPY_PREVENT_REMOVAL_CMD   0x1e
#define IDEFLOPPY_SEEK_CMD              0x2b
#define IDEFLOPPY_START_STOP_CMD        0x1b
#define IDEFLOPPY_TEST_UNIT_READY_CMD   0x00
#define IDEFLOPPY_VERIFY_CMD            0x2f
#define IDEFLOPPY_WRITE10_CMD           0x2a
#define IDEFLOPPY_WRITE12_CMD           0xaa
#define IDEFLOPPY_WRITE_VERIFY_CMD      0x2e

/*
 *      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

/*
 *      Special requests for our block device strategy routine.
 */
#define IDEFLOPPY_FIRST_RQ      90

/*
 *      IDEFLOPPY_PC_RQ is used to queue a packet command in the request queue.
 */
#define IDEFLOPPY_PC_RQ         90

#define IDEFLOPPY_LAST_RQ       90

/*
 *      A macro which can be used to check if a given request command
 *      originated in the driver or in the buffer cache layer.
 */
#define IDEFLOPPY_RQ_CMD(cmd)   ((cmd >= IDEFLOPPY_FIRST_RQ) && (cmd <= IDEFLOPPY_LAST_RQ))

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

/*
 *      The following is used to format the general configuration word of
 *      the ATAPI IDENTIFY DEVICE command.
 */
struct idefloppy_id_gcw {       
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned packet_size            :2;     /* Packet Size */
        unsigned reserved234            :3;     /* Reserved */
        unsigned drq_type               :2;     /* Command packet DRQ type */
        unsigned removable              :1;     /* Removable media */
        unsigned device_type            :5;     /* Device type */
        unsigned reserved13             :1;     /* Reserved */
        unsigned protocol               :2;     /* Protocol type */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned protocol               :2;     /* Protocol type */
        unsigned reserved13             :1;     /* Reserved */
        unsigned device_type            :5;     /* Device type */
        unsigned removable              :1;     /* Removable media */
        unsigned drq_type               :2;     /* Command packet DRQ type */
        unsigned reserved234            :3;     /* Reserved */
        unsigned packet_size            :2;     /* Packet Size */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
};

/*
 *      INQUIRY packet command - Data Format
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        device_type     :5;     /* Peripheral Device Type */
        unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
        unsigned        reserved1_6t0   :7;     /* Reserved */
        unsigned        rmb             :1;     /* Removable Medium Bit */
        unsigned        ansi_version    :3;     /* ANSI Version */
        unsigned        ecma_version    :3;     /* ECMA Version */
        unsigned        iso_version     :2;     /* ISO Version */
        unsigned        response_format :4;     /* Response Data Format */
        unsigned        reserved3_45    :2;     /* Reserved */
        unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
        unsigned        reserved3_7     :1;     /* AENC - Reserved */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
        unsigned        device_type     :5;     /* Peripheral Device Type */
        unsigned        rmb             :1;     /* Removable Medium Bit */
        unsigned        reserved1_6t0   :7;     /* Reserved */
        unsigned        iso_version     :2;     /* ISO Version */
        unsigned        ecma_version    :3;     /* ECMA Version */
        unsigned        ansi_version    :3;     /* ANSI Version */
        unsigned        reserved3_7     :1;     /* AENC - Reserved */
        unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
        unsigned        reserved3_45    :2;     /* Reserved */
        unsigned        response_format :4;     /* Response Data Format */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              additional_length;      /* Additional Length (total_length-4) */
        u8              rsv5, rsv6, rsv7;       /* Reserved */
        u8              vendor_id[8];           /* Vendor Identification */
        u8              product_id[16];         /* Product Identification */
        u8              revision_level[4];      /* Revision Level */
        u8              vendor_specific[20];    /* Vendor Specific - Optional */
        u8              reserved56t95[40];      /* Reserved - Optional */
                                                /* Additional information may be returned */
} idefloppy_inquiry_result_t;

/*
 *      REQUEST SENSE packet command result - Data Format.
 */
typedef struct {
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        error_code      :7;     /* Current error (0x70) */
        unsigned        valid           :1;     /* The information field conforms to SFF-8070i */
        u8              reserved1       :8;     /* Reserved */
        unsigned        sense_key       :4;     /* Sense Key */
        unsigned        reserved2_4     :1;     /* Reserved */
        unsigned        ili             :1;     /* Incorrect Length Indicator */
        unsigned        reserved2_67    :2;
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        valid           :1;     /* The information field conforms to SFF-8070i */
        unsigned        error_code      :7;     /* Current error (0x70) */
        u8              reserved1       :8;     /* Reserved */
        unsigned        reserved2_67    :2;
        unsigned        ili             :1;     /* Incorrect Length Indicator */
        unsigned        reserved2_4     :1;     /* Reserved */
        unsigned        sense_key       :4;     /* Sense Key */
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u32             information __attribute__ ((packed));
        u8              asl;                    /* Additional sense length (n-7) */
        u32             command_specific;       /* Additional command specific information */
        u8              asc;                    /* Additional Sense Code */
        u8              ascq;                   /* Additional Sense Code Qualifier */
        u8              replaceable_unit_code;  /* Field Replaceable Unit Code */
        u8              sksv[3];
        u8              pad[2];                 /* Padding to 20 bytes */
} idefloppy_request_sense_result_t;

/*
 *      Pages of the SELECT SENSE / MODE SENSE packet commands.
 */
#define IDEFLOPPY_CAPABILITIES_PAGE     0x1b
#define IDEFLOPPY_FLEXIBLE_DISK_PAGE    0x05

/*
 *      Mode Parameter Header for the MODE SENSE packet command
 */
typedef struct {
        u16             mode_data_length;       /* Length of the following data transfer */
        u8              medium_type;            /* Medium Type */
#if defined(__LITTLE_ENDIAN_BITFIELD)
        unsigned        reserved3       :7;
        unsigned        wp              :1;     /* Write protect */
#elif defined(__BIG_ENDIAN_BITFIELD)
        unsigned        wp              :1;     /* Write protect */
        unsigned        reserved3       :7;
#else
#error "Bitfield endianness not defined! Check your byteorder.h"
#endif
        u8              reserved[4];
} idefloppy_mode_parameter_header_t;

#define IDEFLOPPY_MIN(a,b)      ((a)<(b) ? (a):(b))
#define IDEFLOPPY_MAX(a,b)      ((a)>(b) ? (a):(b))

/*
 *      Too bad. The drive wants to send us data which we are not ready to accept.
 *      Just throw it away.
 */
static void idefloppy_discard_data (ide_drive_t *drive, unsigned int bcount)
{
        while (bcount--)
                (void) HWIF(drive)->INB(IDE_DATA_REG);
}

#if IDEFLOPPY_DEBUG_BUGS
static void idefloppy_write_zeros (ide_drive_t *drive, unsigned int bcount)
{
        while (bcount--)
                HWIF(drive)->OUTB(0, IDE_DATA_REG);
}
#endif /* IDEFLOPPY_DEBUG_BUGS */


static int idefloppy_end_request (ide_drive_t *drive, int uptodate)
{
        struct request *rq;
        unsigned long flags;
        int ret = 1;

        spin_lock_irqsave(&io_request_lock, flags);
        rq = HWGROUP(drive)->rq;

        /*
         * decide whether to reenable DMA -- 3 is a random magic for now,
         * if we DMA timeout more than 3 times, just stay in PIO
         */
        if (drive->state == DMA_PIO_RETRY && drive->retry_pio <= 3) {
                drive->state = 0;
                HWGROUP(drive)->hwif->ide_dma_on(drive);
        }

        if (!end_that_request_first(rq, uptodate, drive->name)) {
                add_blkdev_randomness(MAJOR(rq->rq_dev));
                blkdev_dequeue_request(rq);
                HWGROUP(drive)->rq = NULL;
                end_that_request_last(rq);
                ret = 0;
        }
        spin_unlock_irqrestore(&io_request_lock, flags);
        return ret;
}

/*
 *      idefloppy_do_end_request is 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_do_end_request (ide_drive_t *drive, int uptodate)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        struct request *rq = HWGROUP(drive)->rq;
        int error;

#if IDEFLOPPY_DEBUG_LOG
        printk(KERN_INFO "Reached idefloppy_end_request\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        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 (!IDEFLOPPY_RQ_CMD(rq->cmd)) {
                /* our real local end request function */
                idefloppy_end_request(drive, uptodate);
                return 0;
        }
        rq->errors = error;
        /* fixme: need to move this local also */
        ide_end_drive_cmd(drive, 0, 0);
        return 0;
}

static void idefloppy_input_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
        struct request *rq = pc->rq;
        struct buffer_head *bh = rq->bh;
        int count;

        while (bcount) {
                if (pc->b_count == bh->b_size) {
                        rq->sector += rq->current_nr_sectors;
                        rq->nr_sectors -= rq->current_nr_sectors;
                        idefloppy_do_end_request(drive, 1);
                        if ((bh = rq->bh) != NULL)
                                pc->b_count = 0;
                }
                if (bh == NULL) {
                        printk(KERN_ERR "%s: bh == NULL in "
                                "idefloppy_input_buffers, bcount == %d\n",
                                drive->name, bcount);
                        idefloppy_discard_data(drive, bcount);
                        return;
                }
                count = IDEFLOPPY_MIN(bh->b_size - pc->b_count, bcount);
                HWIF(drive)->atapi_input_bytes(drive, bh->b_data + pc->b_count, count);
                bcount -= count;
                pc->b_count += count;
        }
}

static void idefloppy_output_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
        struct request *rq = pc->rq;
        struct buffer_head *bh = rq->bh;
        int count;
        
        while (bcount) {
                if (!pc->b_count) {
                        rq->sector += rq->current_nr_sectors;
                        rq->nr_sectors -= rq->current_nr_sectors;
                        idefloppy_do_end_request(drive, 1);
                        if ((bh = rq->bh) != NULL) {
                                pc->b_data = bh->b_data;
                                pc->b_count = bh->b_size;
                        }
                }
                if (bh == NULL) {
                        printk(KERN_ERR "%s: bh == NULL in "
                                "idefloppy_output_buffers, bcount == %d\n",
                                drive->name, bcount);
                        idefloppy_write_zeros (drive, bcount);
                        return;
                }
                count = IDEFLOPPY_MIN(pc->b_count, bcount);
                HWIF(drive)->atapi_output_bytes(drive, pc->b_data, count);
                bcount -= count;
                pc->b_data += count;
                pc->b_count -= count;
        }
}

#ifdef CONFIG_BLK_DEV_IDEDMA
static void idefloppy_update_buffers (ide_drive_t *drive, idefloppy_pc_t *pc)
{
        struct request *rq = pc->rq;
        struct buffer_head *bh = rq->bh;

        while ((bh = rq->bh) != NULL)
                idefloppy_do_end_request(drive, 1);
}
#endif /* CONFIG_BLK_DEV_IDEDMA */

/*
 *      idefloppy_queue_pc_head generates 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,idefloppy_pc_t *pc,struct request *rq)
{
        ide_init_drive_cmd(rq);
        rq->buffer = (char *)pc;
        rq->cmd = IDEFLOPPY_PC_RQ;
        (void) ide_do_drive_cmd(drive, rq, ide_preempt);
}

static idefloppy_pc_t *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++]);
}

/*
 *      idefloppy_analyze_error is called on each failed packet command retry
 *      to analyze the request sense.
 */
static void idefloppy_analyze_error (ide_drive_t *drive,idefloppy_request_sense_result_t *result)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        floppy->sense_key = result->sense_key;
        floppy->asc = result->asc;
        floppy->ascq = result->ascq;
        floppy->progress_indication = result->sksv[0] & 0x80 ?
                (u16)get_unaligned((u16 *)(result->sksv+1)):0x10000;
#if IDEFLOPPY_DEBUG_LOG
        if (floppy->failed_pc)
                printk(KERN_INFO "ide-floppy: pc = %x, sense key = %x, "
                        "asc = %x, ascq = %x\n", floppy->failed_pc->c[0],
                        result->sense_key, result->asc, result->ascq);
        else
                printk(KERN_INFO "ide-floppy: sense key = %x, asc = %x, "
                        "ascq = %x\n", result->sense_key,
                        result->asc, result->ascq);
#endif /* IDEFLOPPY_DEBUG_LOG */
}

static void idefloppy_request_sense_callback (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

#if IDEFLOPPY_DEBUG_LOG
        printk(KERN_INFO "ide-floppy: Reached %s\n", __FUNCTION__);
#endif /* IDEFLOPPY_DEBUG_LOG */
        if (!floppy->pc->error) {
                idefloppy_analyze_error(drive,(idefloppy_request_sense_result_t *) floppy->pc->buffer);
                idefloppy_do_end_request(drive, 1);
        } else {
                printk(KERN_ERR "Error in REQUEST SENSE itself - Aborting request!\n");
                idefloppy_do_end_request(drive, 0);
        }
}

/*
 *      General packet command callback function.
 */
static void idefloppy_pc_callback (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "ide-floppy: Reached %s\n", __FUNCTION__);
#endif /* IDEFLOPPY_DEBUG_LOG */

        idefloppy_do_end_request(drive, floppy->pc->error ? 0 : 1);
}

/*
 *      idefloppy_init_pc initializes a packet command.
 */
static void idefloppy_init_pc (idefloppy_pc_t *pc)
{
        memset(pc->c, 0, 12);
        pc->retries = 0;
        pc->flags = 0;
        pc->request_transfer = 0;
        pc->buffer = pc->pc_buffer;
        pc->buffer_size = IDEFLOPPY_PC_BUFFER_SIZE;
        pc->b_data = NULL;
        pc->callback = &idefloppy_pc_callback;
}

static void idefloppy_create_request_sense_cmd (idefloppy_pc_t *pc)
{
        idefloppy_init_pc(pc);  
        pc->c[0] = IDEFLOPPY_REQUEST_SENSE_CMD;
        pc->c[4] = 255;
        pc->request_transfer = 18;
        pc->callback = &idefloppy_request_sense_callback;
}

/*
 *      idefloppy_retry_pc is 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)
{
        idefloppy_pc_t *pc;
        struct request *rq;
        atapi_error_t error;

        error.all = HWIF(drive)->INB(IDE_ERROR_REG);
        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);
}

/*
 *      idefloppy_pc_intr is the usual interrupt handler which will be called
 *      during a packet command.
 */
static ide_startstop_t idefloppy_pc_intr (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        atapi_status_t status;
        atapi_bcount_t bcount;
        atapi_ireason_t ireason;
        idefloppy_pc_t *pc = floppy->pc;
        struct request *rq = pc->rq;
        unsigned int temp;

#if IDEFLOPPY_DEBUG_LOG
        printk(KERN_INFO "ide-floppy: Reached %s interrupt handler\n",
                __FUNCTION__);
#endif /* IDEFLOPPY_DEBUG_LOG */        

#ifdef CONFIG_BLK_DEV_IDEDMA
        if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
                if (HWIF(drive)->ide_dma_end(drive)) {
                        set_bit(PC_DMA_ERROR, &pc->flags);
                } else {
                        pc->actually_transferred = pc->request_transfer;
                        idefloppy_update_buffers(drive, pc);
                }
#if IDEFLOPPY_DEBUG_LOG
                printk (KERN_INFO "ide-floppy: DMA finished\n");
#endif /* IDEFLOPPY_DEBUG_LOG */
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */

        /* Clear the interrupt */
        status.all = HWIF(drive)->INB(IDE_STATUS_REG);

        if (!status.b.drq) {                    /* No more interrupts */
#if IDEFLOPPY_DEBUG_LOG
                printk(KERN_INFO "Packet command completed, %d bytes "
                        "transferred\n", pc->actually_transferred);
#endif /* IDEFLOPPY_DEBUG_LOG */
                clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);

                local_irq_enable();

                if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) {
                        /* Error detected */
#if IDEFLOPPY_DEBUG_LOG
                        printk(KERN_INFO "ide-floppy: %s: I/O error\n",
                                drive->name);
#endif /* IDEFLOPPY_DEBUG_LOG */
                        rq->errors++;
                        if (pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
                                printk(KERN_ERR "ide-floppy: I/O error in "
                                        "request sense command\n");
                                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;
        }
#ifdef CONFIG_BLK_DEV_IDEDMA
        if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
                printk(KERN_ERR "ide-floppy: The floppy wants to issue "
                        "more interrupts in DMA mode\n");
                (void) HWIF(drive)->ide_dma_off(drive);
                return ide_do_reset(drive);
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */
        /* Get the number of bytes to transfer */
        bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
        bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
        /* on this interrupt */
        ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);

        if (ireason.b.cod) {
                printk(KERN_ERR "ide-floppy: CoD != 0 in idefloppy_pc_intr\n");
                return ide_do_reset(drive);
        }
        if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) {
                /* Hopefully, we will never get here */
                printk(KERN_ERR "ide-floppy: We wanted to %s, ",
                        ireason.b.io ? "Write":"Read");
                printk(KERN_ERR "but the floppy wants us to %s !\n",
                        ireason.b.io ? "Read":"Write");
                return ide_do_reset(drive);
        }
        if (!test_bit(PC_WRITING, &pc->flags)) {
                /* Reading - Check that we have enough space */
                temp = pc->actually_transferred + bcount.all;
                if (temp > pc->request_transfer) {
                        if (temp > pc->buffer_size) {
                                printk(KERN_ERR "ide-floppy: The floppy wants "
                                        "to send us more data than expected "
                                        "- discarding data\n");
                                idefloppy_discard_data(drive,bcount.all);
                                if (HWGROUP(drive)->handler != NULL)
                                        BUG();
                                ide_set_handler(drive,
                                                &idefloppy_pc_intr,
                                                IDEFLOPPY_WAIT_CMD,
                                                NULL);
                                return ide_started;
                        }
#if IDEFLOPPY_DEBUG_LOG
                        printk(KERN_NOTICE "ide-floppy: The floppy wants to "
                                "send us more data than expected - "
                                "allowing transfer\n");
#endif /* IDEFLOPPY_DEBUG_LOG */
                }
        }
        if (test_bit(PC_WRITING, &pc->flags)) {
                if (pc->buffer != NULL)
                        /* Write the current buffer */
                        HWIF(drive)->atapi_output_bytes(drive,
                                                pc->current_position,
                                                bcount.all);
                else
                        idefloppy_output_buffers(drive, pc, bcount.all);
        } else {
                if (pc->buffer != NULL)
                        /* Read the current buffer */
                        HWIF(drive)->atapi_input_bytes(drive,
                                                pc->current_position,
                                                bcount.all);
                else
                        idefloppy_input_buffers(drive, pc, bcount.all);
        }
        /* Update the current position */
        pc->actually_transferred += bcount.all;
        pc->current_position += bcount.all;

        if (HWGROUP(drive)->handler != NULL)
                BUG();
        ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);           /* And set the interrupt handler again */
        return ide_started;
}

/*
 * This is the original routine that did the packet transfer.
 * It fails at high speeds on the Iomega ZIP drive, so there's a slower version
 * for that drive below. The algorithm is chosen based on drive type
 */
static ide_startstop_t idefloppy_transfer_pc (ide_drive_t *drive)
{
        ide_startstop_t startstop;
        idefloppy_floppy_t *floppy = drive->driver_data;
        atapi_ireason_t ireason;

        if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
                printk(KERN_ERR "ide-floppy: Strange, packet command "
                                "initiated yet DRQ isn't asserted\n");
                return startstop;
        }
        ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
        if (!ireason.b.cod || ireason.b.io) {
                printk(KERN_ERR "ide-floppy: (IO,CoD) != (0,1) while "
                                "issuing a packet command\n");
                return ide_do_reset(drive);
        }
        if (HWGROUP(drive)->handler != NULL)
                BUG();
        /* Set the interrupt routine */
        ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);
        /* Send the actual packet */
        HWIF(drive)->atapi_output_bytes(drive, floppy->pc->c, 12);
        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 it's 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 */
        HWIF(drive)->atapi_output_bytes(drive, floppy->pc->c, 12);
        /* Timeout for the packet command */
        return IDEFLOPPY_WAIT_CMD;
}

static ide_startstop_t idefloppy_transfer_pc1 (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        ide_startstop_t startstop;
        atapi_ireason_t ireason;

        if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
                printk(KERN_ERR "ide-floppy: Strange, packet command "
                                "initiated yet DRQ isn't asserted\n");
                return startstop;
        }
        ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
        if (!ireason.b.cod || ireason.b.io) {
                printk(KERN_ERR "ide-floppy: (IO,CoD) != (0,1) "
                                "while issuing a packet command\n");
                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 (HWGROUP(drive)->handler != NULL)
                BUG();
        ide_set_handler(drive, 
          &idefloppy_pc_intr,           /* service routine for packet command */
          floppy->ticks,                /* wait this long before "failing" */
          &idefloppy_transfer_pc2);     /* fail == transfer_pc2 */
        return ide_started;
}

/*
 *      Issue a packet command
 */
static ide_startstop_t idefloppy_issue_pc (ide_drive_t *drive, idefloppy_pc_t *pc)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        atapi_feature_t feature;
        atapi_bcount_t bcount;
        ide_handler_t *pkt_xfer_routine;

#if IDEFLOPPY_DEBUG_BUGS
        if (floppy->pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD &&
            pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
                printk(KERN_ERR "ide-floppy: possible ide-floppy.c bug - "
                        "Two request sense in serial were issued\n");
        }
#endif /* IDEFLOPPY_DEBUG_BUGS */

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

        if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES ||
            test_bit(PC_ABORT, &pc->flags)) {
                /*
                 *      We will "abort" retrying a packet command in case
                 *      a legitimate error code was received.
                 */
                if (!test_bit(PC_ABORT, &pc->flags)) {
                        if (!test_bit(PC_SUPPRESS_ERROR, &pc->flags)) {
                                printk(KERN_ERR "ide-floppy: %s: I/O error, "
                                                "pc = %2x, key = %2x, "
                                                "asc = %2x, ascq = %2x\n",
                                                drive->name, pc->c[0],
                                                floppy->sense_key,
                                                floppy->asc, floppy->ascq);
                        }
                        /* Giving up */
                        pc->error = IDEFLOPPY_ERROR_GENERAL;
                }
                floppy->failed_pc = NULL;
                pc->callback(drive);
                return ide_stopped;
        }
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "Retry number - %d\n", pc->retries);
#endif /* IDEFLOPPY_DEBUG_LOG */

        pc->retries++;
        /* We haven't transferred any data yet */
        pc->actually_transferred = 0;
        pc->current_position = pc->buffer;
        bcount.all = IDE_MIN(pc->request_transfer, 63 * 1024);

#ifdef CONFIG_BLK_DEV_IDEDMA
        if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags)) {
                (void) HWIF(drive)->ide_dma_off(drive);
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */
        feature.all = 0;
#ifdef CONFIG_BLK_DEV_IDEDMA
        if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma) {
                if (test_bit(PC_WRITING, &pc->flags)) {
                        feature.b.dma = !HWIF(drive)->ide_dma_write(drive);
                } else {
                        feature.b.dma = !HWIF(drive)->ide_dma_read(drive);
                }
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */

        if (IDE_CONTROL_REG)
                HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
        /* Use PIO/DMA */
        HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
        HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
        HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
        HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);

#ifdef CONFIG_BLK_DEV_IDEDMA
        if (feature.b.dma) {    /* Begin DMA, if necessary */
                set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
                (void) (HWIF(drive)->ide_dma_begin(drive));
        }
#endif /* CONFIG_BLK_DEV_IDEDMA */

        /* Can we transfer the packet when we get the interrupt or wait? */
        if (test_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags)) {
                /* wait */
                pkt_xfer_routine = &idefloppy_transfer_pc1;
        } else {
                /* immediate */
                pkt_xfer_routine = &idefloppy_transfer_pc;
        }
        
        if (test_bit(IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags)) {
                /* Issue the packet command */
                ide_execute_command(drive, WIN_PACKETCMD, 
                                pkt_xfer_routine,
                                IDEFLOPPY_WAIT_CMD,
                                NULL);
                return ide_started;
        } else {
                /* Issue the packet command */
                HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
                return (*pkt_xfer_routine) (drive);
        }
}

static void idefloppy_rw_callback (ide_drive_t *drive)
{
#if IDEFLOPPY_DEBUG_LOG 
        printk (KERN_INFO "ide-floppy: Reached idefloppy_rw_callback\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        idefloppy_do_end_request(drive, 1);
        return;
}

static void idefloppy_create_prevent_cmd (idefloppy_pc_t *pc, int prevent)
{
#if IDEFLOPPY_DEBUG_LOG
        printk(KERN_INFO "ide-floppy: creating prevent removal command, "
                "prevent = %d\n", prevent);
#endif /* IDEFLOPPY_DEBUG_LOG */

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

static void idefloppy_create_read_capacity_cmd (idefloppy_pc_t *pc)
{
        idefloppy_init_pc(pc);
        pc->c[0] = IDEFLOPPY_READ_CAPACITY_CMD;
        pc->c[7] = 255;
        pc->c[8] = 255;
        pc->request_transfer = 255;
}

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

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

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

        put_unaligned(htonl(b), (unsigned int *)(&pc->buffer[4]));
        put_unaligned(htonl(l), (unsigned int *)(&pc->buffer[8]));
        pc->buffer_size=12;
        set_bit(PC_WRITING, &pc->flags);
}

/*
 *      A mode sense command is used to "sense" floppy parameters.
 */
static void idefloppy_create_mode_sense_cmd (idefloppy_pc_t *pc, u8 page_code, u8 type)
{
        u16 length = sizeof(idefloppy_mode_parameter_header_t);
        
        idefloppy_init_pc(pc);
        pc->c[0] = IDEFLOPPY_MODE_SENSE_CMD;
        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(htons(length), (u16 *) &pc->c[7]);
        pc->request_transfer = length;
}

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

static void idefloppy_create_test_unit_ready_cmd(idefloppy_pc_t *pc)
{
        idefloppy_init_pc(pc);
        pc->c[0] = IDEFLOPPY_TEST_UNIT_READY_CMD;
}

static void idefloppy_create_rw_cmd (idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq, unsigned long sector)
{
        int block = sector / floppy->bs_factor;
        int blocks = rq->nr_sectors / floppy->bs_factor;
        
#if IDEFLOPPY_DEBUG_LOG
        printk("create_rw1%d_cmd: block == %d, blocks == %d\n",
                2 * test_bit(IDEFLOPPY_USE_READ12, &floppy->flags),
                block, blocks);
#endif /* IDEFLOPPY_DEBUG_LOG */

        idefloppy_init_pc(pc);
        if (test_bit(IDEFLOPPY_USE_READ12, &floppy->flags)) {
                pc->c[0] = rq->cmd == READ ? IDEFLOPPY_READ12_CMD : IDEFLOPPY_WRITE12_CMD;
                put_unaligned(htonl(blocks), (unsigned int *) &pc->c[6]);
        } else {
                pc->c[0] = rq->cmd == READ ? IDEFLOPPY_READ10_CMD : IDEFLOPPY_WRITE10_CMD;
                put_unaligned(htons(blocks), (u16 *) &pc->c[7]);
        }
        put_unaligned(htonl(block), (unsigned int *) &pc->c[2]);
        pc->callback = &idefloppy_rw_callback;
        pc->rq = rq;
        pc->b_data = rq->buffer;
        pc->b_count = rq->cmd == READ ? 0 : rq->bh->b_size;
        if (rq->cmd == WRITE)
                set_bit(PC_WRITING, &pc->flags);
        pc->buffer = NULL;
        pc->request_transfer = pc->buffer_size = blocks * floppy->block_size;
        set_bit(PC_DMA_RECOMMENDED, &pc->flags);
}

/*
 *      idefloppy_do_request is our request handling function.  
 */
static ide_startstop_t idefloppy_do_request (ide_drive_t *drive, struct request *rq, unsigned long block)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t *pc;

#if IDEFLOPPY_DEBUG_LOG
        printk(KERN_INFO "rq_status: %d, rq_dev: %u, cmd: %d, errors: %d\n",
                rq->rq_status, (unsigned int) rq->rq_dev, rq->cmd, rq->errors);
        printk(KERN_INFO "sector: %ld, nr_sectors: %ld, "
                        "current_nr_sectors: %ld\n", rq->sector,
                        rq->nr_sectors, rq->current_nr_sectors);
#endif /* IDEFLOPPY_DEBUG_LOG */

        if (rq->errors >= ERROR_MAX) {
                if (floppy->failed_pc != NULL)
                        printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x,"
                                        " key = %2x, asc = %2x, ascq = %2x\n",
                                drive->name, floppy->failed_pc->c[0],
                                floppy->sense_key, floppy->asc, floppy->ascq);
                else
                        printk(KERN_ERR "ide-floppy: %s: I/O error\n",
                                drive->name);
                idefloppy_do_end_request(drive, 0);
                return ide_stopped;
        }
        switch (rq->cmd) {
                case READ:
                case WRITE:
                        if (rq->sector % floppy->bs_factor ||
                            rq->nr_sectors % floppy->bs_factor) {
                                printk("%s: unsupported r/w request size\n",
                                        drive->name);
                                idefloppy_do_end_request(drive, 0);
                                return ide_stopped;
                        }
                        pc = idefloppy_next_pc_storage(drive);
                        idefloppy_create_rw_cmd(floppy, pc, rq, block);
                        break;
                case IDEFLOPPY_PC_RQ:
                        pc = (idefloppy_pc_t *) rq->buffer;
                        break;
                default:
                        printk(KERN_ERR "ide-floppy: unsupported command %x"
                                " in request queue\n", rq->cmd);
                        idefloppy_do_end_request(drive, 0);
                        return ide_stopped;
        }
        pc->rq = rq;
        return idefloppy_issue_pc(drive, pc);
}

/*
 *      idefloppy_queue_pc_tail adds a special packet command request to the
 *      tail of the request queue, and waits for it to be serviced.
 */
static int idefloppy_queue_pc_tail (ide_drive_t *drive,idefloppy_pc_t *pc)
{
        struct request rq;

        ide_init_drive_cmd(&rq);
        rq.buffer = (char *) pc;
        rq.cmd = IDEFLOPPY_PC_RQ;
        return ide_do_drive_cmd(drive, &rq, ide_wait);
}

/*
 *      Look at the flexible disk page parameters. We will ignore the CHS
 *      capacity parameters and use the LBA parameters instead.
 */
static int idefloppy_get_flexible_disk_page (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t pc;
        idefloppy_mode_parameter_header_t *header;
        idefloppy_flexible_disk_page_t *page;
        int capacity, lba_capacity;

        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;
        }
        header = (idefloppy_mode_parameter_header_t *) pc.buffer;
        floppy->wp = header->wp;
        page = (idefloppy_flexible_disk_page_t *) (header + 1);

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

        floppy->flexible_disk_page = *page;
        drive->bios_cyl = page->cyls;
        drive->bios_head = page->heads;
        drive->bios_sect = page->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_capability_page(ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t pc;
        idefloppy_mode_parameter_header_t *header;
        idefloppy_capabilities_page_t *page;

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

        set_bit(PC_SUPPRESS_ERROR, &pc.flags);
        if (idefloppy_queue_pc_tail(drive,&pc)) {
                return 1;
        }

        header = (idefloppy_mode_parameter_header_t *) pc.buffer;
        page= (idefloppy_capabilities_page_t *)(header+1);
        floppy->srfp = page->srfp;
        return (0);
}

/*
 *      Determine if a media is present in the floppy drive, and if so,
 *      its LBA capacity.
 */
static int idefloppy_get_capacity (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t pc;
        idefloppy_capacity_header_t *header;
        idefloppy_capacity_descriptor_t *descriptor;
        int i, descriptors, rc = 1, blocks, length;
        
        drive->bios_cyl = 0;
        drive->bios_head = drive->bios_sect = 0;
        floppy->blocks = floppy->bs_factor = 0;
        drive->part[0].nr_sects = 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 = (idefloppy_capacity_header_t *) pc.buffer;
        descriptors = header->length / sizeof(idefloppy_capacity_descriptor_t);
        descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);

        for (i = 0; i < descriptors; i++, descriptor++) {
                blocks = descriptor->blocks = ntohl(descriptor->blocks);
                length = descriptor->length = ntohs(descriptor->length);

                if (!i) 
                {
                switch (descriptor->dc) {
                /* Clik! drive returns this instead of CAPACITY_CURRENT */
                case CAPACITY_UNFORMATTED:
                        if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags))
                                /*
                                 * If it is not a clik drive, break out
                                 * (maintains previous driver behaviour)
                                 */
                                break;
                case CAPACITY_CURRENT:
                        /* Normal Zip/LS-120 disks */
                        if (memcmp(descriptor, &floppy->capacity, sizeof (idefloppy_capacity_descriptor_t)))
                                printk(KERN_INFO "%s: %dkB, %d blocks, %d "
                                        "sector size\n", drive->name,
                                        blocks * length / 1024, blocks, length);
                        floppy->capacity = *descriptor;
                        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;
                                if ((floppy->bs_factor = length / 512) != 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;
                }
                }
                if (!i) {
                        IDEFLOPPY_DEBUG( "Descriptor 0 Code: %d\n",
                                descriptor->dc);
                }
                IDEFLOPPY_DEBUG( "Descriptor %d: %dkB, %d blocks, %d "
                        "sector size\n", i, blocks * length / 1024, blocks,
                        length);
        }

        /* Clik! disk does not support get_flexible_disk_page */
        if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
                (void) idefloppy_get_flexible_disk_page(drive);
        }

        drive->part[0].nr_sects = floppy->blocks * floppy->bs_factor;
        return rc;
}

/*
** Obtain the list of formattable capacities.
** Very similar to idefloppy_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 idefloppy_get_format_capacities (ide_drive_t *drive,
                                            struct inode *inode,
                                            struct file *file,
                                            int *arg)   /* Cheater */
{
        idefloppy_pc_t pc;
        idefloppy_capacity_header_t *header;
        idefloppy_capacity_descriptor_t *descriptor;
        int i, descriptors, blocks, length;
        int u_array_size;
        int u_index;
        int *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 = (idefloppy_capacity_header_t *) pc.buffer;
        descriptors = header->length /
                sizeof(idefloppy_capacity_descriptor_t);
        descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);

        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=0; i<descriptors; i++, descriptor++) {
                if (u_index >= u_array_size)
                        break;  /* User-supplied buffer too small */
                if (i == 0)
                        continue;       /* Skip the first descriptor */

                blocks = ntohl(descriptor->blocks);
                length = ntohs(descriptor->length);

                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);
}

/*
** 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.
*/

static int idefloppy_begin_format(ide_drive_t *drive,
                                  struct inode *inode,
                                  struct file *file,
                                  int *arg)
{
        int blocks;
        int length;
        int flags;
        idefloppy_pc_t pc;

        if (get_user(blocks, arg) ||
            get_user(length, arg+1) ||
            get_user(flags, arg+2)) {
                return (-EFAULT);
        }

        /* Get the SFRP bit */
        (void) idefloppy_get_capability_page(drive);
        idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
        if (idefloppy_queue_pc_tail(drive, &pc)) {
                return (-EIO);
        }

        return (0);
}

/*
** Get ATAPI_FORMAT_UNIT progress indication.
**
** Userland gives a pointer to an int.  The int is set to a progresss
** 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,
                                         struct inode *inode,
                                         struct file *file,
                                         int *arg)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t 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 {
                atapi_status_t status;
                unsigned long flags;

                local_irq_save(flags);
                status.all = HWIF(drive)->INB(IDE_STATUS_REG);
                local_irq_restore(flags);

                progress_indication = !status.b.dsc ? 0 : 0x10000;
        }
        if (put_user(progress_indication, arg))
                return (-EFAULT);

        return (0);
}

/*
 *      Our special ide-floppy ioctl's.
 *
 *      Currently there aren't any ioctl's.
 */
static int idefloppy_ioctl (ide_drive_t *drive, struct inode *inode, struct file *file,
                                 unsigned int cmd, unsigned long arg)
{
        idefloppy_pc_t pc;
        idefloppy_floppy_t *floppy = drive->driver_data;
        int prevent = (arg) ? 1 : 0;

        switch (cmd) {
        case CDROMEJECT:
                prevent = 0;
                /* fall through */
        case CDROM_LOCKDOOR:
                if (drive->usage > 1)
                        return -EBUSY;

                /* The IOMEGA Clik! Drive doesn't support this command - no room for an eject mechanism */
                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
                        idefloppy_create_prevent_cmd(&pc, prevent);
                        (void) idefloppy_queue_pc_tail(drive, &pc);
                }
                if (cmd == CDROMEJECT) {
                        idefloppy_create_start_stop_cmd(&pc, 2);
                        (void) idefloppy_queue_pc_tail(drive, &pc);
                }
                return 0;
        case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
                return (0);
        case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
                return (idefloppy_get_format_capacities(drive, inode, file,
                                                        (int *)arg));
        case IDEFLOPPY_IOCTL_FORMAT_START:

                if (!(file->f_mode & 2))
                        return (-EPERM);

                {
                        idefloppy_floppy_t *floppy = drive->driver_data;

                        if (drive->usage > 1) {
                                /* Don't format if someone is using the disk */

                                clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
                                          &floppy->flags);
                                return -EBUSY;
                        } else {
                                int rc;

                                set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
                                        &floppy->flags);

                                rc=idefloppy_begin_format(drive, inode,
                                                              file,
                                                              (int *)arg);

                                if (rc)
                                        clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
                                                  &floppy->flags);
                                return (rc);

                        /*
                        ** Note, the bit will be cleared when the device is
                        ** closed.  This is the cleanest way to handle the
                        ** situation where the drive does not support
                        ** format progress reporting.
                        */
                        }
                }
        case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
                return (idefloppy_get_format_progress(drive, inode, file,
                                                      (int *)arg));
        }
        return -EIO;
}

/*
 *      Our open/release functions
 */
static int idefloppy_open (struct inode *inode, struct file *filp, ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        idefloppy_pc_t pc;
        
#if IDEFLOPPY_DEBUG_LOG
        printk(KERN_INFO "Reached idefloppy_open\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        MOD_INC_USE_COUNT;
        if (drive->usage == 1) {
                clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
                /* 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 (idefloppy_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
                    */
                    ) {
                        drive->usage--;
                        MOD_DEC_USE_COUNT;
                        return -EIO;
                }

                if (floppy->wp && (filp->f_mode & 2)) {
                        drive->usage--;
                        MOD_DEC_USE_COUNT;
                        return -EROFS;
                }               
                set_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
                /* IOMEGA Clik! drives do not support lock/unlock commands */
                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
                        idefloppy_create_prevent_cmd(&pc, 1);
                        (void) idefloppy_queue_pc_tail(drive, &pc);
                }
                check_disk_change(inode->i_rdev);
        } else if (test_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags)) {
                drive->usage--;
                MOD_DEC_USE_COUNT;
                return -EBUSY;
        }
        return 0;
}

static void idefloppy_release (struct inode *inode, struct file *filp, ide_drive_t *drive)
{
        idefloppy_pc_t pc;
        
#if IDEFLOPPY_DEBUG_LOG
        printk (KERN_INFO "Reached idefloppy_release\n");
#endif /* IDEFLOPPY_DEBUG_LOG */

        if (!drive->usage) {
                idefloppy_floppy_t *floppy = drive->driver_data;

                invalidate_bdev(inode->i_bdev, 0);

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

                clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
        }
        MOD_DEC_USE_COUNT;
}

/*
 *      Check media change. Use a simple algorithm for now.
 */
static int idefloppy_media_change (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        
        return test_and_clear_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
}

/*
 *      Revalidate the new media. Should set blk_size[]
 */
static void idefloppy_revalidate (ide_drive_t *drive)
{
        grok_partitions(HWIF(drive)->gd, drive->select.b.unit,
                        1<<PARTN_BITS,
                        current_capacity(drive));
}

/*
 *      Return the current floppy capacity to ide.c.
 */
static unsigned long idefloppy_capacity (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;
        unsigned long capacity = floppy->blocks * floppy->bs_factor;

        return capacity;
}

/*
 *      idefloppy_identify_device checks if 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)
{
        struct idefloppy_id_gcw gcw;
#if IDEFLOPPY_DEBUG_INFO
        u16 mask,i;
        char buffer[80];
#endif /* IDEFLOPPY_DEBUG_INFO */

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

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

#if IDEFLOPPY_DEBUG_INFO
        printk(KERN_INFO "Dumping ATAPI Identify Device floppy parameters\n");
        switch (gcw.protocol) {
                case 0: case 1: sprintf(buffer, "ATA");break;
                case 2: sprintf(buffer, "ATAPI");break;
                case 3: sprintf(buffer, "Reserved (Unknown to ide-floppy)");break;
        }
        printk(KERN_INFO "Protocol Type: %s\n", buffer);
        switch (gcw.device_type) {
                case 0: sprintf(buffer, "Direct-access Device");break;
                case 1: sprintf(buffer, "Streaming Tape Device");break;
                case 2: case 3: case 4: sprintf (buffer, "Reserved");break;
                case 5: sprintf(buffer, "CD-ROM Device");break;
                case 6: sprintf(buffer, "Reserved");
                case 7: sprintf(buffer, "Optical memory Device");break;
                case 0x1f: sprintf(buffer, "Unknown or no Device type");break;
                default: sprintf(buffer, "Reserved");
        }
        printk(KERN_INFO "Device Type: %x - %s\n", gcw.device_type, buffer);
        printk(KERN_INFO "Removable: %s\n",gcw.removable ? "Yes":"No"); 
        switch (gcw.drq_type) {
                case 0: sprintf(buffer, "Microprocessor DRQ");break;
                case 1: sprintf(buffer, "Interrupt DRQ");break;
                case 2: sprintf(buffer, "Accelerated DRQ");break;
                case 3: sprintf(buffer, "Reserved");break;
        }
        printk(KERN_INFO "Command Packet DRQ Type: %s\n", buffer);
        switch (gcw.packet_size) {
                case 0: sprintf(buffer, "12 bytes");break;
                case 1: sprintf(buffer, "16 bytes");break;
                default: sprintf(buffer, "Reserved");break;
        }
        printk(KERN_INFO "Command Packet Size: %s\n", buffer);
        printk(KERN_INFO "Model: %.40s\n",id->model);
        printk(KERN_INFO "Firmware Revision: %.8s\n",id->fw_rev);
        printk(KERN_INFO "Serial Number: %.20s\n",id->serial_no);
        printk(KERN_INFO "Write buffer size(?): %d bytes\n",id->buf_size*512);
        printk(KERN_INFO "DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
        printk(KERN_INFO "LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
        printk(KERN_INFO "IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
        printk(KERN_INFO "IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
        printk(KERN_INFO "ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
        printk(KERN_INFO "PIO Cycle Timing Category: %d\n",id->tPIO);
        printk(KERN_INFO "DMA Cycle Timing Category: %d\n",id->tDMA);
        printk(KERN_INFO "Single Word DMA supported modes:\n");
        for (i=0,mask=1;i<8;i++,mask=mask << 1) {
                if (id->dma_1word & mask)
                        printk(KERN_INFO "   Mode %d%s\n", i,
                        (id->dma_1word & (mask << 8)) ? " (active)" : "");
        }
        printk(KERN_INFO "Multi Word DMA supported modes:\n");
        for (i=0,mask=1;i<8;i++,mask=mask << 1) {
                if (id->dma_mword & mask)
                        printk(KERN_INFO "   Mode %d%s\n", i,
                        (id->dma_mword & (mask << 8)) ? " (active)" : "");
        }
        if (id->field_valid & 0x0002) {
                printk(KERN_INFO "Enhanced PIO Modes: %s\n",
                        id->eide_pio_modes & 1 ? "Mode 3":"None");
                if (id->eide_dma_min == 0)
                        sprintf(buffer, "Not supported");
                else
                        sprintf(buffer, "%d ns",id->eide_dma_min);
                printk(KERN_INFO "Minimum Multi-word DMA cycle per word: %s\n", buffer);
                if (id->eide_dma_time == 0)
                        sprintf(buffer, "Not supported");
                else
                        sprintf(buffer, "%d ns",id->eide_dma_time);
                printk(KERN_INFO "Manufacturer\'s Recommended Multi-word cycle: %s\n", buffer);
                if (id->eide_pio == 0)
                        sprintf(buffer, "Not supported");
                else
                        sprintf(buffer, "%d ns",id->eide_pio);
                printk(KERN_INFO "Minimum PIO cycle without IORDY: %s\n",
                        buffer);
                if (id->eide_pio_iordy == 0)
                        sprintf(buffer, "Not supported");
                else
                        sprintf(buffer, "%d ns",id->eide_pio_iordy);
                printk(KERN_INFO "Minimum PIO cycle with IORDY: %s\n", buffer);
        } else
                printk(KERN_INFO "According to the device, fields 64-70 are not valid.\n");
#endif /* IDEFLOPPY_DEBUG_INFO */

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

static void idefloppy_add_settings(ide_drive_t *drive)
{
        int major = HWIF(drive)->major;
        int minor = drive->select.b.unit << PARTN_BITS;
        idefloppy_floppy_t *floppy = drive->driver_data;

/*
 *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 */
        ide_add_setting(drive,  "bios_cyl",             SETTING_RW,                                     -1,                     -1,                     TYPE_INT,       0,      1023,                           1,      1,      &drive->bios_cyl,               NULL);
        ide_add_setting(drive,  "bios_head",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      255,                            1,      1,      &drive->bios_head,              NULL);
        ide_add_setting(drive,  "bios_sect",            SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      63,                             1,      1,      &drive->bios_sect,              NULL);
        ide_add_setting(drive,  "breada_readahead",     SETTING_RW,                                     BLKRAGET,               BLKRASET,               TYPE_INT,       0,      255,                            1,      2,      &read_ahead[major],             NULL);
        ide_add_setting(drive,  "file_readahead",       SETTING_RW,                                     BLKFRAGET,              BLKFRASET,              TYPE_INTA,      0,      INT_MAX,                        1,      1024,   &max_readahead[major][minor],   NULL);
        ide_add_setting(drive,  "max_kb_per_request",   SETTING_RW,                                     BLKSECTGET,             BLKSECTSET,             TYPE_INTA,      1,      255,                            1,      2,      &max_sectors[major][minor],     NULL);
        ide_add_setting(drive,  "ticks",                SETTING_RW,                                     -1,                     -1,                     TYPE_BYTE,      0,      255,                            1,      1,      &floppy->ticks,         NULL);
}

/*
 *      Driver initialization.
 */
static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
{

        struct idefloppy_id_gcw gcw;
        int major = HWIF(drive)->major, i;
        int minor = drive->select.b.unit << PARTN_BITS;

        *((u16 *) &gcw) = drive->id->config;
        drive->driver_data = floppy;
        drive->ready_stat = 0;
        memset(floppy, 0, sizeof(idefloppy_floppy_t));
        floppy->drive = drive;
        floppy->pc = floppy->pc_stack;
        if (gcw.drq_type == 1)
                set_bit(IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags);
        /*
         *      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 (strcmp(drive->id->model, "IOMEGA ZIP 100 ATAPI") == 0) {
                set_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags);
                /* This value will be visible in the /proc/ide/hdx/settings */
                floppy->ticks = IDEFLOPPY_TICKS_DELAY;
                for (i = 0; i < 1 << PARTN_BITS; i++)
                        max_sectors[major][minor + i] = 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) {
                for (i = 0; i < 1 << PARTN_BITS; i++)
                        max_sectors[major][minor + i] = 64;
                set_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags);
        }


        (void) idefloppy_get_capacity(drive);
        idefloppy_add_settings(drive);
        for (i = 0; i < MAX_DRIVES; ++i) {
                ide_hwif_t *hwif = HWIF(drive);

                if (drive != &hwif->drives[i]) continue;
                hwif->gd->de_arr[i] = drive->de;
                if (drive->removable)
                        hwif->gd->flags[i] |= GENHD_FL_REMOVABLE;
                break;
        }
}

static int idefloppy_cleanup (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy = drive->driver_data;

        if (ide_unregister_subdriver(drive))
                return 1;

        drive->driver_data = NULL;
        kfree(floppy);
        return 0;
}

#ifdef CONFIG_PROC_FS

static ide_proc_entry_t idefloppy_proc[] = {
        { "geometry",   S_IFREG|S_IRUGO,        proc_ide_read_geometry, NULL },
        { NULL, 0, NULL, NULL }
};

#else

#define idefloppy_proc  NULL

#endif  /* CONFIG_PROC_FS */

int idefloppy_init (void);
int idefloppy_attach(ide_drive_t *drive);

/*
 *      IDE subdriver functions, registered with ide.c
 */
static ide_driver_t idefloppy_driver = {
        name:                   "ide-floppy",
        version:                IDEFLOPPY_VERSION,
        media:                  ide_floppy,
        busy:                   0,
        supports_dma:           1,
        supports_dsc_overlap:   0,
        cleanup:                idefloppy_cleanup,
        standby:                NULL,
        suspend:                NULL,
        resume:                 NULL,
        flushcache:             NULL,
        do_request:             idefloppy_do_request,
        end_request:            idefloppy_do_end_request,
        sense:                  NULL,
        error:                  NULL,
        ioctl:                  idefloppy_ioctl,
        open:                   idefloppy_open,
        release:                idefloppy_release,
        media_change:           idefloppy_media_change,
        revalidate:             idefloppy_revalidate,
        pre_reset:              NULL,
        capacity:               idefloppy_capacity,
        special:                NULL,
        proc:                   idefloppy_proc,
        init:                   idefloppy_init,
        attach:                 idefloppy_attach,
        ata_prebuilder:         NULL,
        atapi_prebuilder:       NULL,
};

static ide_module_t idefloppy_module = {
        IDE_DRIVER_MODULE,
        idefloppy_init,
        &idefloppy_driver,
        NULL
};

int idefloppy_attach (ide_drive_t *drive)
{
        idefloppy_floppy_t *floppy;
        int ret = 0;

        MOD_INC_USE_COUNT;
        if (!idefloppy_identify_device(drive, drive->id)) {
                printk(KERN_ERR "ide-floppy: %s: not supported by this "
                        "version of ide-floppy\n", drive->name);
                        ret = 1;
                        goto bye_game_over;
        }
        if (drive->scsi) {
                printk("ide-floppy: passing drive %s to ide-scsi "
                        "emulation.\n", drive->name);
                ret = 1;
                goto bye_game_over;
        }
        if ((floppy = (idefloppy_floppy_t *) kmalloc(sizeof (idefloppy_floppy_t), GFP_KERNEL)) == NULL) {
                printk(KERN_ERR "ide-floppy: %s: Can't allocate a floppy "
                        "structure\n", drive->name);
                ret = 1;
                goto bye_game_over;
        }
        if (ide_register_subdriver(drive,
                        &idefloppy_driver, IDE_SUBDRIVER_VERSION)) {
                printk(KERN_ERR "ide-floppy: %s: Failed to register the "
                        "driver with ide.c\n", drive->name);
                kfree(floppy);
                ret = 1;
                goto bye_game_over;
        }
        DRIVER(drive)->busy++;
        idefloppy_setup(drive, floppy);
        DRIVER(drive)->busy--;

bye_game_over:
        MOD_DEC_USE_COUNT;
        return ret;
}

MODULE_DESCRIPTION("ATAPI FLOPPY Driver");

static void __exit idefloppy_exit (void)
{
        ide_drive_t *drive;
        int failed = 0;

        while ((drive = ide_scan_devices(ide_floppy, idefloppy_driver.name,
                        &idefloppy_driver, failed)) != NULL) {
                if (idefloppy_cleanup(drive)) {
                        printk("%s: cleanup_module() called while still "
                                "busy\n", drive->name);
                        failed++;
                }
                /* We must remove proc entries defined in this module.
                   Otherwise we oops while accessing these entries */
#ifdef CONFIG_PROC_FS
                if (drive->proc)
                        ide_remove_proc_entries(drive->proc, idefloppy_proc);
#endif
        }
        ide_unregister_module(&idefloppy_module);
}

int idefloppy_init (void)
{
#ifdef CLASSIC_BUILTINS_METHOD
        ide_drive_t *drive;
        idefloppy_floppy_t *floppy;
        int failed = 0;

#endif /* CLASSIC_BUILTINS_METHOD */
        MOD_INC_USE_COUNT;
#ifdef CLASSIC_BUILTINS_METHOD
        while ((drive = ide_scan_devices(ide_floppy,
                        idefloppy_driver.name, NULL, failed++)) != NULL) {
                if (!idefloppy_identify_device(drive, drive->id)) {
                        printk(KERN_ERR "ide-floppy: %s: not supported by "
                                "this version of ide-floppy\n", drive->name);
                        continue;
                }
                if (drive->scsi) {
                        printk("ide-floppy: passing drive %s to ide-scsi "
                                "emulation.\n", drive->name);
                        continue;
                }
                if ((floppy = (idefloppy_floppy_t *) kmalloc(sizeof (idefloppy_floppy_t), GFP_KERNEL)) == NULL) {
                        printk(KERN_ERR "ide-floppy: %s: Can't allocate a "
                                "floppy structure\n", drive->name);
                        continue;
                }
                if (ide_register_subdriver(drive,
                                &idefloppy_driver, IDE_SUBDRIVER_VERSION)) {
                        printk(KERN_ERR "ide-floppy: %s: Failed to register "
                                "the driver with ide.c\n", drive->name);
                        kfree(floppy);
                        continue;
                }
                DRIVER(drive)->busy++;
                idefloppy_setup(drive, floppy);
                DRIVER(drive)->busy--;
                failed--;
        }
#endif /* CLASSIC_BUILTINS_METHOD */
        ide_register_module(&idefloppy_module);
        MOD_DEC_USE_COUNT;
        return 0;
}

module_init(idefloppy_init);
module_exit(idefloppy_exit);
MODULE_LICENSE("GPL");