Logo Search packages:      
Sourcecode: linux version File versions  Download package

ide-floppy.c

/*
 * 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/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 <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/unaligned.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... )

#if IDEFLOPPY_DEBUG_LOG
#define debug_log printk
#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)

/*
 *    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 */
      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_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 */
      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 HZ/20 /* default delay for ZIP 100 (50ms) */

/*
 *    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

#if 0
/*
 *    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))

#endif

/*
 *    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;

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 ide_floppy_release(struct kref *);

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

/*
 *    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 */


/*
 *    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, int nsecs)
{
      idefloppy_floppy_t *floppy = drive->driver_data;
      struct request *rq = HWGROUP(drive)->rq;
      int error;

      debug_log(KERN_INFO "Reached idefloppy_end_request\n");

      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 idefloppy_input_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
      struct request *rq = pc->rq;
      struct bio_vec *bvec;
      struct req_iterator iter;
      unsigned long flags;
      char *data;
      int count, done = 0;

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

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

            data = bvec_kmap_irq(bvec, &flags);
            drive->hwif->atapi_input_bytes(drive, data, count);
            bvec_kunmap_irq(data, &flags);

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

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

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

static void idefloppy_output_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
{
      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);
            drive->hwif->atapi_output_bytes(drive, data, count);
            bvec_kunmap_irq(data, &flags);

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

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

#if IDEFLOPPY_DEBUG_BUGS
      if (bcount) {
            printk(KERN_ERR "%s: leftover data in idefloppy_output_buffers, bcount == %d\n", drive->name, bcount);
            idefloppy_write_zeros(drive, bcount);
      }
#endif
}

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

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

/*
 *    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)
{
      struct ide_floppy_obj *floppy = drive->driver_data;

      ide_init_drive_cmd(rq);
      rq->buffer = (char *) pc;
      rq->cmd_type = REQ_TYPE_SPECIAL;
      rq->rq_disk = floppy->disk;
      (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 (floppy->failed_pc)
            debug_log(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
            debug_log(KERN_INFO "ide-floppy: sense key = %x, asc = %x, "
                  "ascq = %x\n", result->sense_key,
                  result->asc, result->ascq);
}

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

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

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

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

/*
 *    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->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;

      debug_log(KERN_INFO "ide-floppy: Reached %s interrupt handler\n",
            __FUNCTION__);

      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);
            }
            debug_log(KERN_INFO "ide-floppy: DMA finished\n");
      }

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

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

            local_irq_enable_in_hardirq();

            if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) {
                  /* Error detected */
                  debug_log(KERN_INFO "ide-floppy: %s: I/O error\n",
                        drive->name);
                  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;
      }

      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");
            ide_dma_off(drive);
            return ide_do_reset(drive);
      }

      /* 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);
                        BUG_ON(HWGROUP(drive)->handler != NULL);
                        ide_set_handler(drive,
                                    &idefloppy_pc_intr,
                                    IDEFLOPPY_WAIT_CMD,
                                    NULL);
                        return ide_started;
                  }
                  debug_log(KERN_NOTICE "ide-floppy: The floppy wants to "
                        "send us more data than expected - "
                        "allowing transfer\n");
            }
      }
      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;

      BUG_ON(HWGROUP(drive)->handler != NULL);
      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);
      }
      BUG_ON(HWGROUP(drive)->handler != NULL);
      /* 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.
       */
      BUG_ON(HWGROUP(drive)->handler != NULL);
      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;
}

/**
 * idefloppy_should_report_error()
 *
 * Supresses error messages resulting from Medium not present
 */
static inline int idefloppy_should_report_error(idefloppy_floppy_t *floppy)
{
      if (floppy->sense_key == 0x02 &&
          floppy->asc       == 0x3a &&
          floppy->ascq      == 0x00)
            return 0;
      return 1;
}

/*
 *    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;
      ide_hwif_t *hwif = drive->hwif;
      atapi_feature_t feature;
      atapi_bcount_t bcount;
      ide_handler_t *pkt_xfer_routine;

#if 0 /* Accessing floppy->pc is not valid here, the previous pc may be gone
         and have lived on another thread's stack; that stack may have become
         unmapped meanwhile (CONFIG_DEBUG_PAGEALLOC). */
#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 */
#endif

      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)) {
                        if (idefloppy_should_report_error(floppy))
                              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;
      }

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

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

      if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags))
            ide_dma_off(drive);

      feature.all = 0;

      if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
            feature.b.dma = !hwif->dma_setup(drive);

      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);

      if (feature.b.dma) {    /* Begin DMA, if necessary */
            set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
            hwif->dma_start(drive);
      }

      /* 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)
{
      debug_log(KERN_INFO "ide-floppy: Reached idefloppy_rw_callback\n");

      idefloppy_do_end_request(drive, 1, 0);
      return;
}

static void idefloppy_create_prevent_cmd (idefloppy_pc_t *pc, int prevent)
{
      debug_log(KERN_INFO "ide-floppy: creating prevent removal command, "
            "prevent = %d\n", prevent);

      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;
      int cmd = rq_data_dir(rq);

      debug_log("create_rw1%d_cmd: block == %d, blocks == %d\n",
            2 * test_bit (IDEFLOPPY_USE_READ12, &floppy->flags),
            block, blocks);

      idefloppy_init_pc(pc);
      if (test_bit(IDEFLOPPY_USE_READ12, &floppy->flags)) {
            pc->c[0] = cmd == READ ? IDEFLOPPY_READ12_CMD : IDEFLOPPY_WRITE12_CMD;
            put_unaligned(htonl(blocks), (unsigned int *) &pc->c[6]);
      } else {
            pc->c[0] = cmd == READ ? IDEFLOPPY_READ10_CMD : IDEFLOPPY_WRITE10_CMD;
            put_unaligned(htons(blocks), (unsigned short *) &pc->c[7]);
      }
      put_unaligned(htonl(block), (unsigned int *) &pc->c[2]);
      pc->callback = &idefloppy_rw_callback;
      pc->rq = rq;
      pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
      if (rq->cmd_flags & REQ_RW)
            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);
}

static void
idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq)
{
      idefloppy_init_pc(pc);
      pc->callback = &idefloppy_rw_callback;
      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)
            set_bit(PC_WRITING, &pc->flags);
      pc->buffer = rq->data;
      if (rq->bio)
            set_bit(PC_DMA_RECOMMENDED, &pc->flags);
            
      /*
       * possibly problematic, doesn't look like ide-floppy correctly
       * handled scattered requests if dma fails...
       */
      pc->request_transfer = pc->buffer_size = rq->data_len;
}

/*
 *    idefloppy_do_request is our request handling function.      
 */
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;
      idefloppy_pc_t *pc;
      unsigned long block = (unsigned long)block_s;

      debug_log(KERN_INFO "dev: %s, flags: %lx, errors: %d\n",
                  rq->rq_disk ? rq->rq_disk->disk_name : "?",
                  rq->flags, rq->errors);
      debug_log(KERN_INFO "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 != NULL) {
                  if (idefloppy_should_report_error(floppy))
                        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, 0);
            return ide_stopped;
      }
      if (blk_fs_request(rq)) {
            if (((long)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, 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 = (idefloppy_pc_t *) 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_do_end_request(drive, 0, 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 ide_floppy_obj *floppy = drive->driver_data;
      struct request rq;

      ide_init_drive_cmd (&rq);
      rq.buffer = (char *) pc;
      rq.cmd_type = REQ_TYPE_SPECIAL;
      rq.rq_disk = floppy->disk;

      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;
      set_disk_ro(floppy->disk, floppy->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 = 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 = (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) {
                  debug_log( "Descriptor 0 Code: %d\n",
                        descriptor->dc);
            }
            debug_log( "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);
      }

      set_capacity(floppy->disk, 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, int __user *arg)
{
        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 __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 = (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, int __user *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 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;
      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);
}

/*
 *    Return the current floppy capacity.
 */
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;
}

/*
 *    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;
}

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

/*
 *                drive setting name      read/write  data type   min   max   mul_factor  div_factor  data pointer            set function
 */
      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

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

      *((u16 *) &gcw) = drive->id->config;
      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 (!strncmp(drive->id->model, "IOMEGA ZIP 100 ATAPI", 20)) {
            set_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags);
            /* 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);
            set_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags);
      }


      (void) idefloppy_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 ide_floppy_release(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_do_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;
      idefloppy_pc_t pc;
      int ret = 0;

      debug_log(KERN_INFO "Reached idefloppy_open\n");

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

      drive = floppy->drive;

      floppy->openers++;

      if (floppy->openers == 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
                */
                ) {
                  ret = -EIO;
                  goto out_put_floppy;
            }

            if (floppy->wp && (filp->f_mode & 2)) {
                  ret = -EROFS;
                  goto out_put_floppy;
            }
            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_bdev);
      } else if (test_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags)) {
            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;
      idefloppy_pc_t pc;
      
      debug_log(KERN_INFO "Reached idefloppy_release\n");

      if (floppy->openers == 1) {
            /* 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);
      }

      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 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;
      void __user *argp = (void __user *)arg;
      int err;
      int prevent = (arg) ? 1 : 0;
      idefloppy_pc_t pc;

      switch (cmd) {
      case CDROMEJECT:
            prevent = 0;
            /* fall through */
      case CDROM_LOCKDOOR:
            if (floppy->openers > 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, argp);
      case IDEFLOPPY_IOCTL_FORMAT_START:

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

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

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

            set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);

            err = idefloppy_begin_format(drive, argp);
            if (err)
                  clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
            return err;
            /*
            ** 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, 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;

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

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("ide-floppy: passing drive %s to ide-scsi emulation.\n", drive->name);
            goto failed;
      }
      if ((floppy = kzalloc(sizeof (idefloppy_floppy_t), GFP_KERNEL)) == NULL) {
            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;
}

MODULE_DESCRIPTION("ATAPI FLOPPY Driver");

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");

Generated by  Doxygen 1.6.0   Back to index