linux/drivers/ide/ide-floppy.c
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   1/*
   2 * linux/drivers/ide/ide-floppy.c       Version 0.99    Feb 24 2002
   3 *
   4 * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
   5 * Copyright (C) 2000 - 2002 Paul Bristow <paul@paulbristow.net>
   6 */
   7
   8/*
   9 * IDE ATAPI floppy driver.
  10 *
  11 * The driver currently doesn't have any fancy features, just the bare
  12 * minimum read/write support.
  13 *
  14 * This driver supports the following IDE floppy drives:
  15 *
  16 * LS-120/240 SuperDisk
  17 * Iomega Zip 100/250
  18 * Iomega PC Card Clik!/PocketZip
  19 *
  20 * Many thanks to Lode Leroy <Lode.Leroy@www.ibase.be>, who tested so many
  21 * ALPHA patches to this driver on an EASYSTOR LS-120 ATAPI floppy drive.
  22 *
  23 * Ver 0.1   Oct 17 96   Initial test version, mostly based on ide-tape.c.
  24 * Ver 0.2   Oct 31 96   Minor changes.
  25 * Ver 0.3   Dec  2 96   Fixed error recovery bug.
  26 * Ver 0.4   Jan 26 97   Add support for the HDIO_GETGEO ioctl.
  27 * Ver 0.5   Feb 21 97   Add partitions support.
  28 *                       Use the minimum of the LBA and CHS capacities.
  29 *                       Avoid hwgroup->rq == NULL on the last irq.
  30 *                       Fix potential null dereferencing with DEBUG_LOG.
  31 * Ver 0.8   Dec  7 97   Increase irq timeout from 10 to 50 seconds.
  32 *                       Add media write-protect detection.
  33 *                       Issue START command only if TEST UNIT READY fails.
  34 *                       Add work-around for IOMEGA ZIP revision 21.D.
  35 *                       Remove idefloppy_get_capabilities().
  36 * Ver 0.9   Jul  4 99   Fix a bug which might have caused the number of
  37 *                        bytes requested on each interrupt to be zero.
  38 *                        Thanks to <shanos@es.co.nz> for pointing this out.
  39 * Ver 0.9.sv Jan 6 01   Sam Varshavchik <mrsam@courier-mta.com>
  40 *                       Implement low level formatting.  Reimplemented
  41 *                       IDEFLOPPY_CAPABILITIES_PAGE, since we need the srfp
  42 *                       bit.  My LS-120 drive barfs on
  43 *                       IDEFLOPPY_CAPABILITIES_PAGE, but maybe it's just me.
  44 *                       Compromise by not reporting a failure to get this
  45 *                       mode page.  Implemented four IOCTLs in order to
  46 *                       implement formatting.  IOCTls begin with 0x4600,
  47 *                       0x46 is 'F' as in Format.
  48 *            Jan 9 01   Userland option to select format verify.
  49 *                       Added PC_SUPPRESS_ERROR flag - some idefloppy drives
  50 *                       do not implement IDEFLOPPY_CAPABILITIES_PAGE, and
  51 *                       return a sense error.  Suppress error reporting in
  52 *                       this particular case in order to avoid spurious
  53 *                       errors in syslog.  The culprit is
  54 *                       idefloppy_get_capability_page(), so move it to
  55 *                       idefloppy_begin_format() so that it's not used
  56 *                       unless absolutely necessary.
  57 *                       If drive does not support format progress indication
  58 *                       monitor the dsc bit in the status register.
  59 *                       Also, O_NDELAY on open will allow the device to be
  60 *                       opened without a disk available.  This can be used to
  61 *                       open an unformatted disk, or get the device capacity.
  62 * Ver 0.91  Dec 11 99   Added IOMEGA Clik! drive support by 
  63 *                 <paul@paulbristow.net>
  64 * Ver 0.92  Oct 22 00   Paul Bristow became official maintainer for this 
  65 *                         driver.  Included Powerbook internal zip kludge.
  66 * Ver 0.93  Oct 24 00   Fixed bugs for Clik! drive
  67 *                        no disk on insert and disk change now works
  68 * Ver 0.94  Oct 27 00   Tidied up to remove strstr(Clik) everywhere
  69 * Ver 0.95  Nov  7 00   Brought across to kernel 2.4
  70 * Ver 0.96  Jan  7 01   Actually in line with release version of 2.4.0
  71 *                       including set_bit patch from Rusty Russell
  72 * Ver 0.97  Jul 22 01   Merge 0.91-0.96 onto 0.9.sv for ac series
  73 * Ver 0.97.sv Aug 3 01  Backported from 2.4.7-ac3
  74 * Ver 0.98  Oct 26 01   Split idefloppy_transfer_pc into two pieces to
  75 *                        fix a lost interrupt problem. It appears the busy
  76 *                        bit was being deasserted by my IOMEGA ATAPI ZIP 100
  77 *                        drive before the drive was actually ready.
  78 * Ver 0.98a Oct 29 01   Expose delay value so we can play.
  79 * Ver 0.99  Feb 24 02   Remove duplicate code, modify clik! detection code 
  80 *                        to support new PocketZip drives 
  81 */
  82
  83#define IDEFLOPPY_VERSION "0.99.newide"
  84
  85#include <linux/module.h>
  86#include <linux/types.h>
  87#include <linux/string.h>
  88#include <linux/kernel.h>
  89#include <linux/delay.h>
  90#include <linux/timer.h>
  91#include <linux/mm.h>
  92#include <linux/interrupt.h>
  93#include <linux/major.h>
  94#include <linux/errno.h>
  95#include <linux/genhd.h>
  96#include <linux/slab.h>
  97#include <linux/cdrom.h>
  98#include <linux/ide.h>
  99#include <linux/bitops.h>
 100#include <linux/mutex.h>
 101
 102#include <scsi/scsi_ioctl.h>
 103
 104#include <asm/byteorder.h>
 105#include <asm/irq.h>
 106#include <asm/uaccess.h>
 107#include <asm/io.h>
 108#include <asm/unaligned.h>
 109
 110/*
 111 *      The following are used to debug the driver.
 112 */
 113#define IDEFLOPPY_DEBUG_LOG             0
 114#define IDEFLOPPY_DEBUG_INFO            0
 115#define IDEFLOPPY_DEBUG_BUGS            1
 116
 117/* #define IDEFLOPPY_DEBUG(fmt, args...) printk(KERN_INFO fmt, ## args) */
 118#define IDEFLOPPY_DEBUG( fmt, args... )
 119
 120#if IDEFLOPPY_DEBUG_LOG
 121#define debug_log printk
 122#else
 123#define debug_log(fmt, args... ) do {} while(0)
 124#endif
 125
 126
 127/*
 128 *      Some drives require a longer irq timeout.
 129 */
 130#define IDEFLOPPY_WAIT_CMD              (5 * WAIT_CMD)
 131
 132/*
 133 *      After each failed packet command we issue a request sense command
 134 *      and retry the packet command IDEFLOPPY_MAX_PC_RETRIES times.
 135 */
 136#define IDEFLOPPY_MAX_PC_RETRIES        3
 137
 138/*
 139 *      With each packet command, we allocate a buffer of
 140 *      IDEFLOPPY_PC_BUFFER_SIZE bytes.
 141 */
 142#define IDEFLOPPY_PC_BUFFER_SIZE        256
 143
 144/*
 145 *      In various places in the driver, we need to allocate storage
 146 *      for packet commands and requests, which will remain valid while
 147 *      we leave the driver to wait for an interrupt or a timeout event.
 148 */
 149#define IDEFLOPPY_PC_STACK              (10 + IDEFLOPPY_MAX_PC_RETRIES)
 150
 151/*
 152 *      Our view of a packet command.
 153 */
 154typedef struct idefloppy_packet_command_s {
 155        u8 c[12];                               /* Actual packet bytes */
 156        int retries;                            /* On each retry, we increment retries */
 157        int error;                              /* Error code */
 158        int request_transfer;                   /* Bytes to transfer */
 159        int actually_transferred;               /* Bytes actually transferred */
 160        int buffer_size;                        /* Size of our data buffer */
 161        int b_count;                            /* Missing/Available data on the current buffer */
 162        struct request *rq;                     /* The corresponding request */
 163        u8 *buffer;                             /* Data buffer */
 164        u8 *current_position;                   /* Pointer into the above buffer */
 165        void (*callback) (ide_drive_t *);       /* Called when this packet command is completed */
 166        u8 pc_buffer[IDEFLOPPY_PC_BUFFER_SIZE]; /* Temporary buffer */
 167        unsigned long flags;                    /* Status/Action bit flags: long for set_bit */
 168} idefloppy_pc_t;
 169
 170/*
 171 *      Packet command flag bits.
 172 */
 173#define PC_ABORT                        0       /* Set when an error is considered normal - We won't retry */
 174#define PC_DMA_RECOMMENDED              2       /* 1 when we prefer to use DMA if possible */
 175#define PC_DMA_IN_PROGRESS              3       /* 1 while DMA in progress */
 176#define PC_DMA_ERROR                    4       /* 1 when encountered problem during DMA */
 177#define PC_WRITING                      5       /* Data direction */
 178
 179#define PC_SUPPRESS_ERROR               6       /* Suppress error reporting */
 180
 181/*
 182 *      Removable Block Access Capabilities Page
 183 */
 184typedef struct {
 185#if defined(__LITTLE_ENDIAN_BITFIELD)
 186        unsigned        page_code       :6;     /* Page code - Should be 0x1b */
 187        unsigned        reserved1_6     :1;     /* Reserved */
 188        unsigned        ps              :1;     /* Should be 0 */
 189#elif defined(__BIG_ENDIAN_BITFIELD)
 190        unsigned        ps              :1;     /* Should be 0 */
 191        unsigned        reserved1_6     :1;     /* Reserved */
 192        unsigned        page_code       :6;     /* Page code - Should be 0x1b */
 193#else
 194#error "Bitfield endianness not defined! Check your byteorder.h"
 195#endif
 196        u8              page_length;            /* Page Length - Should be 0xa */
 197#if defined(__LITTLE_ENDIAN_BITFIELD)
 198        unsigned        reserved2       :6;
 199        unsigned        srfp            :1;     /* Supports reporting progress of format */
 200        unsigned        sflp            :1;     /* System floppy type device */
 201        unsigned        tlun            :3;     /* Total logical units supported by the device */
 202        unsigned        reserved3       :3;
 203        unsigned        sml             :1;     /* Single / Multiple lun supported */
 204        unsigned        ncd             :1;     /* Non cd optical device */
 205#elif defined(__BIG_ENDIAN_BITFIELD)
 206        unsigned        sflp            :1;     /* System floppy type device */
 207        unsigned        srfp            :1;     /* Supports reporting progress of format */
 208        unsigned        reserved2       :6;
 209        unsigned        ncd             :1;     /* Non cd optical device */
 210        unsigned        sml             :1;     /* Single / Multiple lun supported */
 211        unsigned        reserved3       :3;
 212        unsigned        tlun            :3;     /* Total logical units supported by the device */
 213#else
 214#error "Bitfield endianness not defined! Check your byteorder.h"
 215#endif
 216        u8              reserved[8];
 217} idefloppy_capabilities_page_t;
 218
 219/*
 220 *      Flexible disk page.
 221 */
 222typedef struct {
 223#if defined(__LITTLE_ENDIAN_BITFIELD)
 224        unsigned        page_code       :6;     /* Page code - Should be 0x5 */
 225        unsigned        reserved1_6     :1;     /* Reserved */
 226        unsigned        ps              :1;     /* The device is capable of saving the page */
 227#elif defined(__BIG_ENDIAN_BITFIELD)
 228        unsigned        ps              :1;     /* The device is capable of saving the page */
 229        unsigned        reserved1_6     :1;     /* Reserved */
 230        unsigned        page_code       :6;     /* Page code - Should be 0x5 */
 231#else
 232#error "Bitfield endianness not defined! Check your byteorder.h"
 233#endif
 234        u8              page_length;            /* Page Length - Should be 0x1e */
 235        u16             transfer_rate;          /* In kilobits per second */
 236        u8              heads, sectors;         /* Number of heads, Number of sectors per track */
 237        u16             sector_size;            /* Byes per sector */
 238        u16             cyls;                   /* Number of cylinders */
 239        u8              reserved10[10];
 240        u8              motor_delay;            /* Motor off delay */
 241        u8              reserved21[7];
 242        u16             rpm;                    /* Rotations per minute */
 243        u8              reserved30[2];
 244} idefloppy_flexible_disk_page_t;
 245 
 246/*
 247 *      Format capacity
 248 */
 249typedef struct {
 250        u8              reserved[3];
 251        u8              length;                 /* Length of the following descriptors in bytes */
 252} idefloppy_capacity_header_t;
 253
 254typedef struct {
 255        u32             blocks;                 /* Number of blocks */
 256#if defined(__LITTLE_ENDIAN_BITFIELD)
 257        unsigned        dc              :2;     /* Descriptor Code */
 258        unsigned        reserved        :6;
 259#elif defined(__BIG_ENDIAN_BITFIELD)
 260        unsigned        reserved        :6;
 261        unsigned        dc              :2;     /* Descriptor Code */
 262#else
 263#error "Bitfield endianness not defined! Check your byteorder.h"
 264#endif
 265        u8              length_msb;             /* Block Length (MSB)*/
 266        u16             length;                 /* Block Length */
 267} idefloppy_capacity_descriptor_t;
 268
 269#define CAPACITY_INVALID        0x00
 270#define CAPACITY_UNFORMATTED    0x01
 271#define CAPACITY_CURRENT        0x02
 272#define CAPACITY_NO_CARTRIDGE   0x03
 273
 274/*
 275 *      Most of our global data which we need to save even as we leave the
 276 *      driver due to an interrupt or a timer event is stored in a variable
 277 *      of type idefloppy_floppy_t, defined below.
 278 */
 279typedef struct ide_floppy_obj {
 280        ide_drive_t     *drive;
 281        ide_driver_t    *driver;
 282        struct gendisk  *disk;
 283        struct kref     kref;
 284        unsigned int    openers;        /* protected by BKL for now */
 285
 286        /* Current packet command */
 287        idefloppy_pc_t *pc;
 288        /* Last failed packet command */
 289        idefloppy_pc_t *failed_pc;
 290        /* Packet command stack */
 291        idefloppy_pc_t pc_stack[IDEFLOPPY_PC_STACK];
 292        /* Next free packet command storage space */
 293        int pc_stack_index;
 294        struct request rq_stack[IDEFLOPPY_PC_STACK];
 295        /* We implement a circular array */
 296        int rq_stack_index;
 297
 298        /*
 299         *      Last error information
 300         */
 301        u8 sense_key, asc, ascq;
 302        /* delay this long before sending packet command */
 303        u8 ticks;
 304        int progress_indication;
 305
 306        /*
 307         *      Device information
 308         */
 309        /* Current format */
 310        int blocks, block_size, bs_factor;
 311        /* Last format capacity */
 312        idefloppy_capacity_descriptor_t capacity;
 313        /* Copy of the flexible disk page */
 314        idefloppy_flexible_disk_page_t flexible_disk_page;
 315        /* Write protect */
 316        int wp;
 317        /* Supports format progress report */
 318        int srfp;
 319        /* Status/Action flags */
 320        unsigned long flags;
 321} idefloppy_floppy_t;
 322
 323#define IDEFLOPPY_TICKS_DELAY   HZ/20   /* default delay for ZIP 100 (50ms) */
 324
 325/*
 326 *      Floppy flag bits values.
 327 */
 328#define IDEFLOPPY_DRQ_INTERRUPT         0       /* DRQ interrupt device */
 329#define IDEFLOPPY_MEDIA_CHANGED         1       /* Media may have changed */
 330#define IDEFLOPPY_USE_READ12            2       /* Use READ12/WRITE12 or READ10/WRITE10 */
 331#define IDEFLOPPY_FORMAT_IN_PROGRESS    3       /* Format in progress */
 332#define IDEFLOPPY_CLIK_DRIVE            4       /* Avoid commands not supported in Clik drive */
 333#define IDEFLOPPY_ZIP_DRIVE             5       /* Requires BH algorithm for packets */
 334
 335/*
 336 *      ATAPI floppy drive packet commands
 337 */
 338#define IDEFLOPPY_FORMAT_UNIT_CMD       0x04
 339#define IDEFLOPPY_INQUIRY_CMD           0x12
 340#define IDEFLOPPY_MODE_SELECT_CMD       0x55
 341#define IDEFLOPPY_MODE_SENSE_CMD        0x5a
 342#define IDEFLOPPY_READ10_CMD            0x28
 343#define IDEFLOPPY_READ12_CMD            0xa8
 344#define IDEFLOPPY_READ_CAPACITY_CMD     0x23
 345#define IDEFLOPPY_REQUEST_SENSE_CMD     0x03
 346#define IDEFLOPPY_PREVENT_REMOVAL_CMD   0x1e
 347#define IDEFLOPPY_SEEK_CMD              0x2b
 348#define IDEFLOPPY_START_STOP_CMD        0x1b
 349#define IDEFLOPPY_TEST_UNIT_READY_CMD   0x00
 350#define IDEFLOPPY_VERIFY_CMD            0x2f
 351#define IDEFLOPPY_WRITE10_CMD           0x2a
 352#define IDEFLOPPY_WRITE12_CMD           0xaa
 353#define IDEFLOPPY_WRITE_VERIFY_CMD      0x2e
 354
 355/*
 356 *      Defines for the mode sense command
 357 */
 358#define MODE_SENSE_CURRENT              0x00
 359#define MODE_SENSE_CHANGEABLE           0x01
 360#define MODE_SENSE_DEFAULT              0x02 
 361#define MODE_SENSE_SAVED                0x03
 362
 363/*
 364 *      IOCTLs used in low-level formatting.
 365 */
 366
 367#define IDEFLOPPY_IOCTL_FORMAT_SUPPORTED        0x4600
 368#define IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY     0x4601
 369#define IDEFLOPPY_IOCTL_FORMAT_START            0x4602
 370#define IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS     0x4603
 371
 372#if 0
 373/*
 374 *      Special requests for our block device strategy routine.
 375 */
 376#define IDEFLOPPY_FIRST_RQ      90
 377
 378/*
 379 *      IDEFLOPPY_PC_RQ is used to queue a packet command in the request queue.
 380 */
 381#define IDEFLOPPY_PC_RQ         90
 382
 383#define IDEFLOPPY_LAST_RQ       90
 384
 385/*
 386 *      A macro which can be used to check if a given request command
 387 *      originated in the driver or in the buffer cache layer.
 388 */
 389#define IDEFLOPPY_RQ_CMD(cmd)   ((cmd >= IDEFLOPPY_FIRST_RQ) && (cmd <= IDEFLOPPY_LAST_RQ))
 390
 391#endif
 392
 393/*
 394 *      Error codes which are returned in rq->errors to the higher part
 395 *      of the driver.
 396 */
 397#define IDEFLOPPY_ERROR_GENERAL         101
 398
 399/*
 400 *      The following is used to format the general configuration word of
 401 *      the ATAPI IDENTIFY DEVICE command.
 402 */
 403struct idefloppy_id_gcw {       
 404#if defined(__LITTLE_ENDIAN_BITFIELD)
 405        unsigned packet_size            :2;     /* Packet Size */
 406        unsigned reserved234            :3;     /* Reserved */
 407        unsigned drq_type               :2;     /* Command packet DRQ type */
 408        unsigned removable              :1;     /* Removable media */
 409        unsigned device_type            :5;     /* Device type */
 410        unsigned reserved13             :1;     /* Reserved */
 411        unsigned protocol               :2;     /* Protocol type */
 412#elif defined(__BIG_ENDIAN_BITFIELD)
 413        unsigned protocol               :2;     /* Protocol type */
 414        unsigned reserved13             :1;     /* Reserved */
 415        unsigned device_type            :5;     /* Device type */
 416        unsigned removable              :1;     /* Removable media */
 417        unsigned drq_type               :2;     /* Command packet DRQ type */
 418        unsigned reserved234            :3;     /* Reserved */
 419        unsigned packet_size            :2;     /* Packet Size */
 420#else
 421#error "Bitfield endianness not defined! Check your byteorder.h"
 422#endif
 423};
 424
 425/*
 426 *      INQUIRY packet command - Data Format
 427 */
 428typedef struct {
 429#if defined(__LITTLE_ENDIAN_BITFIELD)
 430        unsigned        device_type     :5;     /* Peripheral Device Type */
 431        unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
 432        unsigned        reserved1_6t0   :7;     /* Reserved */
 433        unsigned        rmb             :1;     /* Removable Medium Bit */
 434        unsigned        ansi_version    :3;     /* ANSI Version */
 435        unsigned        ecma_version    :3;     /* ECMA Version */
 436        unsigned        iso_version     :2;     /* ISO Version */
 437        unsigned        response_format :4;     /* Response Data Format */
 438        unsigned        reserved3_45    :2;     /* Reserved */
 439        unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
 440        unsigned        reserved3_7     :1;     /* AENC - Reserved */
 441#elif defined(__BIG_ENDIAN_BITFIELD)
 442        unsigned        reserved0_765   :3;     /* Peripheral Qualifier - Reserved */
 443        unsigned        device_type     :5;     /* Peripheral Device Type */
 444        unsigned        rmb             :1;     /* Removable Medium Bit */
 445        unsigned        reserved1_6t0   :7;     /* Reserved */
 446        unsigned        iso_version     :2;     /* ISO Version */
 447        unsigned        ecma_version    :3;     /* ECMA Version */
 448        unsigned        ansi_version    :3;     /* ANSI Version */
 449        unsigned        reserved3_7     :1;     /* AENC - Reserved */
 450        unsigned        reserved3_6     :1;     /* TrmIOP - Reserved */
 451        unsigned        reserved3_45    :2;     /* Reserved */
 452        unsigned        response_format :4;     /* Response Data Format */
 453#else
 454#error "Bitfield endianness not defined! Check your byteorder.h"
 455#endif
 456        u8              additional_length;      /* Additional Length (total_length-4) */
 457        u8              rsv5, rsv6, rsv7;       /* Reserved */
 458        u8              vendor_id[8];           /* Vendor Identification */
 459        u8              product_id[16];         /* Product Identification */
 460        u8              revision_level[4];      /* Revision Level */
 461        u8              vendor_specific[20];    /* Vendor Specific - Optional */
 462        u8              reserved56t95[40];      /* Reserved - Optional */
 463                                                /* Additional information may be returned */
 464} idefloppy_inquiry_result_t;
 465
 466/*
 467 *      REQUEST SENSE packet command result - Data Format.
 468 */
 469typedef struct {
 470#if defined(__LITTLE_ENDIAN_BITFIELD)
 471        unsigned        error_code      :7;     /* Current error (0x70) */
 472        unsigned        valid           :1;     /* The information field conforms to SFF-8070i */
 473        u8              reserved1       :8;     /* Reserved */
 474        unsigned        sense_key       :4;     /* Sense Key */
 475        unsigned        reserved2_4     :1;     /* Reserved */
 476        unsigned        ili             :1;     /* Incorrect Length Indicator */
 477        unsigned        reserved2_67    :2;
 478#elif defined(__BIG_ENDIAN_BITFIELD)
 479        unsigned        valid           :1;     /* The information field conforms to SFF-8070i */
 480        unsigned        error_code      :7;     /* Current error (0x70) */
 481        u8              reserved1       :8;     /* Reserved */
 482        unsigned        reserved2_67    :2;
 483        unsigned        ili             :1;     /* Incorrect Length Indicator */
 484        unsigned        reserved2_4     :1;     /* Reserved */
 485        unsigned        sense_key       :4;     /* Sense Key */
 486#else
 487#error "Bitfield endianness not defined! Check your byteorder.h"
 488#endif
 489        u32             information __attribute__ ((packed));
 490        u8              asl;                    /* Additional sense length (n-7) */
 491        u32             command_specific;       /* Additional command specific information */
 492        u8              asc;                    /* Additional Sense Code */
 493        u8              ascq;                   /* Additional Sense Code Qualifier */
 494        u8              replaceable_unit_code;  /* Field Replaceable Unit Code */
 495        u8              sksv[3];
 496        u8              pad[2];                 /* Padding to 20 bytes */
 497} idefloppy_request_sense_result_t;
 498
 499/*
 500 *      Pages of the SELECT SENSE / MODE SENSE packet commands.
 501 */
 502#define IDEFLOPPY_CAPABILITIES_PAGE     0x1b
 503#define IDEFLOPPY_FLEXIBLE_DISK_PAGE    0x05
 504
 505/*
 506 *      Mode Parameter Header for the MODE SENSE packet command
 507 */
 508typedef struct {
 509        u16             mode_data_length;       /* Length of the following data transfer */
 510        u8              medium_type;            /* Medium Type */
 511#if defined(__LITTLE_ENDIAN_BITFIELD)
 512        unsigned        reserved3       :7;
 513        unsigned        wp              :1;     /* Write protect */
 514#elif defined(__BIG_ENDIAN_BITFIELD)
 515        unsigned        wp              :1;     /* Write protect */
 516        unsigned        reserved3       :7;
 517#else
 518#error "Bitfield endianness not defined! Check your byteorder.h"
 519#endif
 520        u8              reserved[4];
 521} idefloppy_mode_parameter_header_t;
 522
 523static DEFINE_MUTEX(idefloppy_ref_mutex);
 524
 525#define to_ide_floppy(obj) container_of(obj, struct ide_floppy_obj, kref)
 526
 527#define ide_floppy_g(disk) \
 528        container_of((disk)->private_data, struct ide_floppy_obj, driver)
 529
 530static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
 531{
 532        struct ide_floppy_obj *floppy = NULL;
 533
 534        mutex_lock(&idefloppy_ref_mutex);
 535        floppy = ide_floppy_g(disk);
 536        if (floppy)
 537                kref_get(&floppy->kref);
 538        mutex_unlock(&idefloppy_ref_mutex);
 539        return floppy;
 540}
 541
 542static void ide_floppy_release(struct kref *);
 543
 544static void ide_floppy_put(struct ide_floppy_obj *floppy)
 545{
 546        mutex_lock(&idefloppy_ref_mutex);
 547        kref_put(&floppy->kref, ide_floppy_release);
 548        mutex_unlock(&idefloppy_ref_mutex);
 549}
 550
 551/*
 552 *      Too bad. The drive wants to send us data which we are not ready to accept.
 553 *      Just throw it away.
 554 */
 555static void idefloppy_discard_data (ide_drive_t *drive, unsigned int bcount)
 556{
 557        while (bcount--)
 558                (void) HWIF(drive)->INB(IDE_DATA_REG);
 559}
 560
 561#if IDEFLOPPY_DEBUG_BUGS
 562static void idefloppy_write_zeros (ide_drive_t *drive, unsigned int bcount)
 563{
 564        while (bcount--)
 565                HWIF(drive)->OUTB(0, IDE_DATA_REG);
 566}
 567#endif /* IDEFLOPPY_DEBUG_BUGS */
 568
 569
 570/*
 571 *      idefloppy_do_end_request is used to finish servicing a request.
 572 *
 573 *      For read/write requests, we will call ide_end_request to pass to the
 574 *      next buffer.
 575 */
 576static int idefloppy_do_end_request(ide_drive_t *drive, int uptodate, int nsecs)
 577{
 578        idefloppy_floppy_t *floppy = drive->driver_data;
 579        struct request *rq = HWGROUP(drive)->rq;
 580        int error;
 581
 582        debug_log(KERN_INFO "Reached idefloppy_end_request\n");
 583
 584        switch (uptodate) {
 585                case 0: error = IDEFLOPPY_ERROR_GENERAL; break;
 586                case 1: error = 0; break;
 587                default: error = uptodate;
 588        }
 589        if (error)
 590                floppy->failed_pc = NULL;
 591        /* Why does this happen? */
 592        if (!rq)
 593                return 0;
 594        if (!blk_special_request(rq)) {
 595                /* our real local end request function */
 596                ide_end_request(drive, uptodate, nsecs);
 597                return 0;
 598        }
 599        rq->errors = error;
 600        /* fixme: need to move this local also */
 601        ide_end_drive_cmd(drive, 0, 0);
 602        return 0;
 603}
 604
 605static void idefloppy_input_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
 606{
 607        struct request *rq = pc->rq;
 608        struct bio_vec *bvec;
 609        struct req_iterator iter;
 610        unsigned long flags;
 611        char *data;
 612        int count, done = 0;
 613
 614        rq_for_each_segment(bvec, rq, iter) {
 615                if (!bcount)
 616                        break;
 617
 618                count = min(bvec->bv_len, bcount);
 619
 620                data = bvec_kmap_irq(bvec, &flags);
 621                drive->hwif->atapi_input_bytes(drive, data, count);
 622                bvec_kunmap_irq(data, &flags);
 623
 624                bcount -= count;
 625                pc->b_count += count;
 626                done += count;
 627        }
 628
 629        idefloppy_do_end_request(drive, 1, done >> 9);
 630
 631        if (bcount) {
 632                printk(KERN_ERR "%s: leftover data in idefloppy_input_buffers, bcount == %d\n", drive->name, bcount);
 633                idefloppy_discard_data(drive, bcount);
 634        }
 635}
 636
 637static void idefloppy_output_buffers (ide_drive_t *drive, idefloppy_pc_t *pc, unsigned int bcount)
 638{
 639        struct request *rq = pc->rq;
 640        struct req_iterator iter;
 641        struct bio_vec *bvec;
 642        unsigned long flags;
 643        int count, done = 0;
 644        char *data;
 645
 646        rq_for_each_segment(bvec, rq, iter) {
 647                if (!bcount)
 648                        break;
 649
 650                count = min(bvec->bv_len, bcount);
 651
 652                data = bvec_kmap_irq(bvec, &flags);
 653                drive->hwif->atapi_output_bytes(drive, data, count);
 654                bvec_kunmap_irq(data, &flags);
 655
 656                bcount -= count;
 657                pc->b_count += count;
 658                done += count;
 659        }
 660
 661        idefloppy_do_end_request(drive, 1, done >> 9);
 662
 663#if IDEFLOPPY_DEBUG_BUGS
 664        if (bcount) {
 665                printk(KERN_ERR "%s: leftover data in idefloppy_output_buffers, bcount == %d\n", drive->name, bcount);
 666                idefloppy_write_zeros(drive, bcount);
 667        }
 668#endif
 669}
 670
 671static void idefloppy_update_buffers (ide_drive_t *drive, idefloppy_pc_t *pc)
 672{
 673        struct request *rq = pc->rq;
 674        struct bio *bio = rq->bio;
 675
 676        while ((bio = rq->bio) != NULL)
 677                idefloppy_do_end_request(drive, 1, 0);
 678}
 679
 680/*
 681 *      idefloppy_queue_pc_head generates a new packet command request in front
 682 *      of the request queue, before the current request, so that it will be
 683 *      processed immediately, on the next pass through the driver.
 684 */
 685static void idefloppy_queue_pc_head (ide_drive_t *drive,idefloppy_pc_t *pc,struct request *rq)
 686{
 687        struct ide_floppy_obj *floppy = drive->driver_data;
 688
 689        ide_init_drive_cmd(rq);
 690        rq->buffer = (char *) pc;
 691        rq->cmd_type = REQ_TYPE_SPECIAL;
 692        rq->rq_disk = floppy->disk;
 693        (void) ide_do_drive_cmd(drive, rq, ide_preempt);
 694}
 695
 696static idefloppy_pc_t *idefloppy_next_pc_storage (ide_drive_t *drive)
 697{
 698        idefloppy_floppy_t *floppy = drive->driver_data;
 699
 700        if (floppy->pc_stack_index == IDEFLOPPY_PC_STACK)
 701                floppy->pc_stack_index=0;
 702        return (&floppy->pc_stack[floppy->pc_stack_index++]);
 703}
 704
 705static struct request *idefloppy_next_rq_storage (ide_drive_t *drive)
 706{
 707        idefloppy_floppy_t *floppy = drive->driver_data;
 708
 709        if (floppy->rq_stack_index == IDEFLOPPY_PC_STACK)
 710                floppy->rq_stack_index = 0;
 711        return (&floppy->rq_stack[floppy->rq_stack_index++]);
 712}
 713
 714/*
 715 *      idefloppy_analyze_error is called on each failed packet command retry
 716 *      to analyze the request sense.
 717 */
 718static void idefloppy_analyze_error (ide_drive_t *drive,idefloppy_request_sense_result_t *result)
 719{
 720        idefloppy_floppy_t *floppy = drive->driver_data;
 721
 722        floppy->sense_key = result->sense_key;
 723        floppy->asc = result->asc;
 724        floppy->ascq = result->ascq;
 725        floppy->progress_indication = result->sksv[0] & 0x80 ?
 726                (u16)get_unaligned((u16 *)(result->sksv+1)):0x10000;
 727        if (floppy->failed_pc)
 728                debug_log(KERN_INFO "ide-floppy: pc = %x, sense key = %x, "
 729                        "asc = %x, ascq = %x\n", floppy->failed_pc->c[0],
 730                        result->sense_key, result->asc, result->ascq);
 731        else
 732                debug_log(KERN_INFO "ide-floppy: sense key = %x, asc = %x, "
 733                        "ascq = %x\n", result->sense_key,
 734                        result->asc, result->ascq);
 735}
 736
 737static void idefloppy_request_sense_callback (ide_drive_t *drive)
 738{
 739        idefloppy_floppy_t *floppy = drive->driver_data;
 740
 741        debug_log(KERN_INFO "ide-floppy: Reached %s\n", __FUNCTION__);
 742        
 743        if (!floppy->pc->error) {
 744                idefloppy_analyze_error(drive,(idefloppy_request_sense_result_t *) floppy->pc->buffer);
 745                idefloppy_do_end_request(drive, 1, 0);
 746        } else {
 747                printk(KERN_ERR "Error in REQUEST SENSE itself - Aborting request!\n");
 748                idefloppy_do_end_request(drive, 0, 0);
 749        }
 750}
 751
 752/*
 753 *      General packet command callback function.
 754 */
 755static void idefloppy_pc_callback (ide_drive_t *drive)
 756{
 757        idefloppy_floppy_t *floppy = drive->driver_data;
 758        
 759        debug_log(KERN_INFO "ide-floppy: Reached %s\n", __FUNCTION__);
 760
 761        idefloppy_do_end_request(drive, floppy->pc->error ? 0 : 1, 0);
 762}
 763
 764/*
 765 *      idefloppy_init_pc initializes a packet command.
 766 */
 767static void idefloppy_init_pc (idefloppy_pc_t *pc)
 768{
 769        memset(pc->c, 0, 12);
 770        pc->retries = 0;
 771        pc->flags = 0;
 772        pc->request_transfer = 0;
 773        pc->buffer = pc->pc_buffer;
 774        pc->buffer_size = IDEFLOPPY_PC_BUFFER_SIZE;
 775        pc->callback = &idefloppy_pc_callback;
 776}
 777
 778static void idefloppy_create_request_sense_cmd (idefloppy_pc_t *pc)
 779{
 780        idefloppy_init_pc(pc);  
 781        pc->c[0] = IDEFLOPPY_REQUEST_SENSE_CMD;
 782        pc->c[4] = 255;
 783        pc->request_transfer = 18;
 784        pc->callback = &idefloppy_request_sense_callback;
 785}
 786
 787/*
 788 *      idefloppy_retry_pc is called when an error was detected during the
 789 *      last packet command. We queue a request sense packet command in
 790 *      the head of the request list.
 791 */
 792static void idefloppy_retry_pc (ide_drive_t *drive)
 793{
 794        idefloppy_pc_t *pc;
 795        struct request *rq;
 796        atapi_error_t error;
 797
 798        error.all = HWIF(drive)->INB(IDE_ERROR_REG);
 799        pc = idefloppy_next_pc_storage(drive);
 800        rq = idefloppy_next_rq_storage(drive);
 801        idefloppy_create_request_sense_cmd(pc);
 802        idefloppy_queue_pc_head(drive, pc, rq);
 803}
 804
 805/*
 806 *      idefloppy_pc_intr is the usual interrupt handler which will be called
 807 *      during a packet command.
 808 */
 809static ide_startstop_t idefloppy_pc_intr (ide_drive_t *drive)
 810{
 811        idefloppy_floppy_t *floppy = drive->driver_data;
 812        atapi_status_t status;
 813        atapi_bcount_t bcount;
 814        atapi_ireason_t ireason;
 815        idefloppy_pc_t *pc = floppy->pc;
 816        struct request *rq = pc->rq;
 817        unsigned int temp;
 818
 819        debug_log(KERN_INFO "ide-floppy: Reached %s interrupt handler\n",
 820                __FUNCTION__);
 821
 822        if (test_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
 823                if (HWIF(drive)->ide_dma_end(drive)) {
 824                        set_bit(PC_DMA_ERROR, &pc->flags);
 825                } else {
 826                        pc->actually_transferred = pc->request_transfer;
 827                        idefloppy_update_buffers(drive, pc);
 828                }
 829                debug_log(KERN_INFO "ide-floppy: DMA finished\n");
 830        }
 831
 832        /* Clear the interrupt */
 833        status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 834
 835        if (!status.b.drq) {                    /* No more interrupts */
 836                debug_log(KERN_INFO "Packet command completed, %d bytes "
 837                        "transferred\n", pc->actually_transferred);
 838                clear_bit(PC_DMA_IN_PROGRESS, &pc->flags);
 839
 840                local_irq_enable_in_hardirq();
 841
 842                if (status.b.check || test_bit(PC_DMA_ERROR, &pc->flags)) {
 843                        /* Error detected */
 844                        debug_log(KERN_INFO "ide-floppy: %s: I/O error\n",
 845                                drive->name);
 846                        rq->errors++;
 847                        if (pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
 848                                printk(KERN_ERR "ide-floppy: I/O error in "
 849                                        "request sense command\n");
 850                                return ide_do_reset(drive);
 851                        }
 852                        /* Retry operation */
 853                        idefloppy_retry_pc(drive);
 854                        /* queued, but not started */
 855                        return ide_stopped;
 856                }
 857                pc->error = 0;
 858                if (floppy->failed_pc == pc)
 859                        floppy->failed_pc = NULL;
 860                /* Command finished - Call the callback function */
 861                pc->callback(drive);
 862                return ide_stopped;
 863        }
 864
 865        if (test_and_clear_bit(PC_DMA_IN_PROGRESS, &pc->flags)) {
 866                printk(KERN_ERR "ide-floppy: The floppy wants to issue "
 867                        "more interrupts in DMA mode\n");
 868                ide_dma_off(drive);
 869                return ide_do_reset(drive);
 870        }
 871
 872        /* Get the number of bytes to transfer */
 873        bcount.b.high = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 874        bcount.b.low = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 875        /* on this interrupt */
 876        ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
 877
 878        if (ireason.b.cod) {
 879                printk(KERN_ERR "ide-floppy: CoD != 0 in idefloppy_pc_intr\n");
 880                return ide_do_reset(drive);
 881        }
 882        if (ireason.b.io == test_bit(PC_WRITING, &pc->flags)) {
 883                /* Hopefully, we will never get here */
 884                printk(KERN_ERR "ide-floppy: We wanted to %s, ",
 885                        ireason.b.io ? "Write":"Read");
 886                printk(KERN_ERR "but the floppy wants us to %s !\n",
 887                        ireason.b.io ? "Read":"Write");
 888                return ide_do_reset(drive);
 889        }
 890        if (!test_bit(PC_WRITING, &pc->flags)) {
 891                /* Reading - Check that we have enough space */
 892                temp = pc->actually_transferred + bcount.all;
 893                if (temp > pc->request_transfer) {
 894                        if (temp > pc->buffer_size) {
 895                                printk(KERN_ERR "ide-floppy: The floppy wants "
 896                                        "to send us more data than expected "
 897                                        "- discarding data\n");
 898                                idefloppy_discard_data(drive,bcount.all);
 899                                BUG_ON(HWGROUP(drive)->handler != NULL);
 900                                ide_set_handler(drive,
 901                                                &idefloppy_pc_intr,
 902                                                IDEFLOPPY_WAIT_CMD,
 903                                                NULL);
 904                                return ide_started;
 905                        }
 906                        debug_log(KERN_NOTICE "ide-floppy: The floppy wants to "
 907                                "send us more data than expected - "
 908                                "allowing transfer\n");
 909                }
 910        }
 911        if (test_bit(PC_WRITING, &pc->flags)) {
 912                if (pc->buffer != NULL)
 913                        /* Write the current buffer */
 914                        HWIF(drive)->atapi_output_bytes(drive,
 915                                                pc->current_position,
 916                                                bcount.all);
 917                else
 918                        idefloppy_output_buffers(drive, pc, bcount.all);
 919        } else {
 920                if (pc->buffer != NULL)
 921                        /* Read the current buffer */
 922                        HWIF(drive)->atapi_input_bytes(drive,
 923                                                pc->current_position,
 924                                                bcount.all);
 925                else
 926                        idefloppy_input_buffers(drive, pc, bcount.all);
 927        }
 928        /* Update the current position */
 929        pc->actually_transferred += bcount.all;
 930        pc->current_position += bcount.all;
 931
 932        BUG_ON(HWGROUP(drive)->handler != NULL);
 933        ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);           /* And set the interrupt handler again */
 934        return ide_started;
 935}
 936
 937/*
 938 * This is the original routine that did the packet transfer.
 939 * It fails at high speeds on the Iomega ZIP drive, so there's a slower version
 940 * for that drive below. The algorithm is chosen based on drive type
 941 */
 942static ide_startstop_t idefloppy_transfer_pc (ide_drive_t *drive)
 943{
 944        ide_startstop_t startstop;
 945        idefloppy_floppy_t *floppy = drive->driver_data;
 946        atapi_ireason_t ireason;
 947
 948        if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
 949                printk(KERN_ERR "ide-floppy: Strange, packet command "
 950                                "initiated yet DRQ isn't asserted\n");
 951                return startstop;
 952        }
 953        ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
 954        if (!ireason.b.cod || ireason.b.io) {
 955                printk(KERN_ERR "ide-floppy: (IO,CoD) != (0,1) while "
 956                                "issuing a packet command\n");
 957                return ide_do_reset(drive);
 958        }
 959        BUG_ON(HWGROUP(drive)->handler != NULL);
 960        /* Set the interrupt routine */
 961        ide_set_handler(drive, &idefloppy_pc_intr, IDEFLOPPY_WAIT_CMD, NULL);
 962        /* Send the actual packet */
 963        HWIF(drive)->atapi_output_bytes(drive, floppy->pc->c, 12);
 964        return ide_started;
 965}
 966
 967
 968/*
 969 * What we have here is a classic case of a top half / bottom half
 970 * interrupt service routine. In interrupt mode, the device sends
 971 * an interrupt to signal it's ready to receive a packet. However,
 972 * we need to delay about 2-3 ticks before issuing the packet or we
 973 * gets in trouble.
 974 *
 975 * So, follow carefully. transfer_pc1 is called as an interrupt (or
 976 * directly). In either case, when the device says it's ready for a 
 977 * packet, we schedule the packet transfer to occur about 2-3 ticks
 978 * later in transfer_pc2.
 979 */
 980static int idefloppy_transfer_pc2 (ide_drive_t *drive)
 981{
 982        idefloppy_floppy_t *floppy = drive->driver_data;
 983
 984        /* Send the actual packet */
 985        HWIF(drive)->atapi_output_bytes(drive, floppy->pc->c, 12);
 986        /* Timeout for the packet command */
 987        return IDEFLOPPY_WAIT_CMD;
 988}
 989
 990static ide_startstop_t idefloppy_transfer_pc1 (ide_drive_t *drive)
 991{
 992        idefloppy_floppy_t *floppy = drive->driver_data;
 993        ide_startstop_t startstop;
 994        atapi_ireason_t ireason;
 995
 996        if (ide_wait_stat(&startstop, drive, DRQ_STAT, BUSY_STAT, WAIT_READY)) {
 997                printk(KERN_ERR "ide-floppy: Strange, packet command "
 998                                "initiated yet DRQ isn't asserted\n");
 999                return startstop;
1000        }
1001        ireason.all = HWIF(drive)->INB(IDE_IREASON_REG);
1002        if (!ireason.b.cod || ireason.b.io) {
1003                printk(KERN_ERR "ide-floppy: (IO,CoD) != (0,1) "
1004                                "while issuing a packet command\n");
1005                return ide_do_reset(drive);
1006        }
1007        /* 
1008         * The following delay solves a problem with ATAPI Zip 100 drives
1009         * where the Busy flag was apparently being deasserted before the
1010         * unit was ready to receive data. This was happening on a
1011         * 1200 MHz Athlon system. 10/26/01 25msec is too short,
1012         * 40 and 50msec work well. idefloppy_pc_intr will not be actually
1013         * used until after the packet is moved in about 50 msec.
1014         */
1015        BUG_ON(HWGROUP(drive)->handler != NULL);
1016        ide_set_handler(drive, 
1017          &idefloppy_pc_intr,           /* service routine for packet command */
1018          floppy->ticks,                /* wait this long before "failing" */
1019          &idefloppy_transfer_pc2);     /* fail == transfer_pc2 */
1020        return ide_started;
1021}
1022
1023/**
1024 * idefloppy_should_report_error()
1025 *
1026 * Supresses error messages resulting from Medium not present
1027 */
1028static inline int idefloppy_should_report_error(idefloppy_floppy_t *floppy)
1029{
1030        if (floppy->sense_key == 0x02 &&
1031            floppy->asc       == 0x3a &&
1032            floppy->ascq      == 0x00)
1033                return 0;
1034        return 1;
1035}
1036
1037/*
1038 *      Issue a packet command
1039 */
1040static ide_startstop_t idefloppy_issue_pc (ide_drive_t *drive, idefloppy_pc_t *pc)
1041{
1042        idefloppy_floppy_t *floppy = drive->driver_data;
1043        ide_hwif_t *hwif = drive->hwif;
1044        atapi_feature_t feature;
1045        atapi_bcount_t bcount;
1046        ide_handler_t *pkt_xfer_routine;
1047
1048#if 0 /* Accessing floppy->pc is not valid here, the previous pc may be gone
1049         and have lived on another thread's stack; that stack may have become
1050         unmapped meanwhile (CONFIG_DEBUG_PAGEALLOC). */
1051#if IDEFLOPPY_DEBUG_BUGS
1052        if (floppy->pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD &&
1053            pc->c[0] == IDEFLOPPY_REQUEST_SENSE_CMD) {
1054                printk(KERN_ERR "ide-floppy: possible ide-floppy.c bug - "
1055                        "Two request sense in serial were issued\n");
1056        }
1057#endif /* IDEFLOPPY_DEBUG_BUGS */
1058#endif
1059
1060        if (floppy->failed_pc == NULL &&
1061            pc->c[0] != IDEFLOPPY_REQUEST_SENSE_CMD)
1062                floppy->failed_pc = pc;
1063        /* Set the current packet command */
1064        floppy->pc = pc;
1065
1066        if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES ||
1067            test_bit(PC_ABORT, &pc->flags)) {
1068                /*
1069                 *      We will "abort" retrying a packet command in case
1070                 *      a legitimate error code was received.
1071                 */
1072                if (!test_bit(PC_ABORT, &pc->flags)) {
1073                        if (!test_bit(PC_SUPPRESS_ERROR, &pc->flags)) {
1074                                if (idefloppy_should_report_error(floppy))
1075                                        printk(KERN_ERR "ide-floppy: %s: I/O error, "
1076                                               "pc = %2x, key = %2x, "
1077                                               "asc = %2x, ascq = %2x\n",
1078                                               drive->name, pc->c[0],
1079                                               floppy->sense_key,
1080                                               floppy->asc, floppy->ascq);
1081                        }
1082                        /* Giving up */
1083                        pc->error = IDEFLOPPY_ERROR_GENERAL;
1084                }
1085                floppy->failed_pc = NULL;
1086                pc->callback(drive);
1087                return ide_stopped;
1088        }
1089
1090        debug_log(KERN_INFO "Retry number - %d\n",pc->retries);
1091
1092        pc->retries++;
1093        /* We haven't transferred any data yet */
1094        pc->actually_transferred = 0;
1095        pc->current_position = pc->buffer;
1096        bcount.all = min(pc->request_transfer, 63 * 1024);
1097
1098        if (test_and_clear_bit(PC_DMA_ERROR, &pc->flags))
1099                ide_dma_off(drive);
1100
1101        feature.all = 0;
1102
1103        if (test_bit(PC_DMA_RECOMMENDED, &pc->flags) && drive->using_dma)
1104                feature.b.dma = !hwif->dma_setup(drive);
1105
1106        if (IDE_CONTROL_REG)
1107                HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
1108        /* Use PIO/DMA */
1109        HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
1110        HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
1111        HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
1112        HWIF(drive)->OUTB(drive->select.all, IDE_SELECT_REG);
1113
1114        if (feature.b.dma) {    /* Begin DMA, if necessary */
1115                set_bit(PC_DMA_IN_PROGRESS, &pc->flags);
1116                hwif->dma_start(drive);
1117        }
1118
1119        /* Can we transfer the packet when we get the interrupt or wait? */
1120        if (test_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags)) {
1121                /* wait */
1122                pkt_xfer_routine = &idefloppy_transfer_pc1;
1123        } else {
1124                /* immediate */
1125                pkt_xfer_routine = &idefloppy_transfer_pc;
1126        }
1127        
1128        if (test_bit (IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags)) {
1129                /* Issue the packet command */
1130                ide_execute_command(drive, WIN_PACKETCMD,
1131                                pkt_xfer_routine,
1132                                IDEFLOPPY_WAIT_CMD,
1133                                NULL);
1134                return ide_started;
1135        } else {
1136                /* Issue the packet command */
1137                HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
1138                return (*pkt_xfer_routine) (drive);
1139        }
1140}
1141
1142static void idefloppy_rw_callback (ide_drive_t *drive)
1143{
1144        debug_log(KERN_INFO "ide-floppy: Reached idefloppy_rw_callback\n");
1145
1146        idefloppy_do_end_request(drive, 1, 0);
1147        return;
1148}
1149
1150static void idefloppy_create_prevent_cmd (idefloppy_pc_t *pc, int prevent)
1151{
1152        debug_log(KERN_INFO "ide-floppy: creating prevent removal command, "
1153                "prevent = %d\n", prevent);
1154
1155        idefloppy_init_pc(pc);
1156        pc->c[0] = IDEFLOPPY_PREVENT_REMOVAL_CMD;
1157        pc->c[4] = prevent;
1158}
1159
1160static void idefloppy_create_read_capacity_cmd (idefloppy_pc_t *pc)
1161{
1162        idefloppy_init_pc(pc);
1163        pc->c[0] = IDEFLOPPY_READ_CAPACITY_CMD;
1164        pc->c[7] = 255;
1165        pc->c[8] = 255;
1166        pc->request_transfer = 255;
1167}
1168
1169static void idefloppy_create_format_unit_cmd (idefloppy_pc_t *pc, int b, int l,
1170                                              int flags)
1171{
1172        idefloppy_init_pc(pc);
1173        pc->c[0] = IDEFLOPPY_FORMAT_UNIT_CMD;
1174        pc->c[1] = 0x17;
1175
1176        memset(pc->buffer, 0, 12);
1177        pc->buffer[1] = 0xA2;
1178        /* Default format list header, u8 1: FOV/DCRT/IMM bits set */
1179
1180        if (flags & 1)                          /* Verify bit on... */
1181                pc->buffer[1] ^= 0x20;          /* ... turn off DCRT bit */
1182        pc->buffer[3] = 8;
1183
1184        put_unaligned(htonl(b), (unsigned int *)(&pc->buffer[4]));
1185        put_unaligned(htonl(l), (unsigned int *)(&pc->buffer[8]));
1186        pc->buffer_size=12;
1187        set_bit(PC_WRITING, &pc->flags);
1188}
1189
1190/*
1191 *      A mode sense command is used to "sense" floppy parameters.
1192 */
1193static void idefloppy_create_mode_sense_cmd (idefloppy_pc_t *pc, u8 page_code, u8 type)
1194{
1195        u16 length = sizeof(idefloppy_mode_parameter_header_t);
1196        
1197        idefloppy_init_pc(pc);
1198        pc->c[0] = IDEFLOPPY_MODE_SENSE_CMD;
1199        pc->c[1] = 0;
1200        pc->c[2] = page_code + (type << 6);
1201
1202        switch (page_code) {
1203                case IDEFLOPPY_CAPABILITIES_PAGE:
1204                        length += 12;
1205                        break;
1206                case IDEFLOPPY_FLEXIBLE_DISK_PAGE:
1207                        length += 32;
1208                        break;
1209                default:
1210                        printk(KERN_ERR "ide-floppy: unsupported page code "
1211                                "in create_mode_sense_cmd\n");
1212        }
1213        put_unaligned(htons(length), (u16 *) &pc->c[7]);
1214        pc->request_transfer = length;
1215}
1216
1217static void idefloppy_create_start_stop_cmd (idefloppy_pc_t *pc, int start)
1218{
1219        idefloppy_init_pc(pc);
1220        pc->c[0] = IDEFLOPPY_START_STOP_CMD;
1221        pc->c[4] = start;
1222}
1223
1224static void idefloppy_create_test_unit_ready_cmd(idefloppy_pc_t *pc)
1225{
1226        idefloppy_init_pc(pc);
1227        pc->c[0] = IDEFLOPPY_TEST_UNIT_READY_CMD;
1228}
1229
1230static void idefloppy_create_rw_cmd (idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq, unsigned long sector)
1231{
1232        int block = sector / floppy->bs_factor;
1233        int blocks = rq->nr_sectors / floppy->bs_factor;
1234        int cmd = rq_data_dir(rq);
1235
1236        debug_log("create_rw1%d_cmd: block == %d, blocks == %d\n",
1237                2 * test_bit (IDEFLOPPY_USE_READ12, &floppy->flags),
1238                block, blocks);
1239
1240        idefloppy_init_pc(pc);
1241        if (test_bit(IDEFLOPPY_USE_READ12, &floppy->flags)) {
1242                pc->c[0] = cmd == READ ? IDEFLOPPY_READ12_CMD : IDEFLOPPY_WRITE12_CMD;
1243                put_unaligned(htonl(blocks), (unsigned int *) &pc->c[6]);
1244        } else {
1245                pc->c[0] = cmd == READ ? IDEFLOPPY_READ10_CMD : IDEFLOPPY_WRITE10_CMD;
1246                put_unaligned(htons(blocks), (unsigned short *) &pc->c[7]);
1247        }
1248        put_unaligned(htonl(block), (unsigned int *) &pc->c[2]);
1249        pc->callback = &idefloppy_rw_callback;
1250        pc->rq = rq;
1251        pc->b_count = cmd == READ ? 0 : rq->bio->bi_size;
1252        if (rq->cmd_flags & REQ_RW)
1253                set_bit(PC_WRITING, &pc->flags);
1254        pc->buffer = NULL;
1255        pc->request_transfer = pc->buffer_size = blocks * floppy->block_size;
1256        set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1257}
1258
1259static void
1260idefloppy_blockpc_cmd(idefloppy_floppy_t *floppy, idefloppy_pc_t *pc, struct request *rq)
1261{
1262        idefloppy_init_pc(pc);
1263        pc->callback = &idefloppy_rw_callback;
1264        memcpy(pc->c, rq->cmd, sizeof(pc->c));
1265        pc->rq = rq;
1266        pc->b_count = rq->data_len;
1267        if (rq->data_len && rq_data_dir(rq) == WRITE)
1268                set_bit(PC_WRITING, &pc->flags);
1269        pc->buffer = rq->data;
1270        if (rq->bio)
1271                set_bit(PC_DMA_RECOMMENDED, &pc->flags);
1272                
1273        /*
1274         * possibly problematic, doesn't look like ide-floppy correctly
1275         * handled scattered requests if dma fails...
1276         */
1277        pc->request_transfer = pc->buffer_size = rq->data_len;
1278}
1279
1280/*
1281 *      idefloppy_do_request is our request handling function.  
1282 */
1283static ide_startstop_t idefloppy_do_request (ide_drive_t *drive, struct request *rq, sector_t block_s)
1284{
1285        idefloppy_floppy_t *floppy = drive->driver_data;
1286        idefloppy_pc_t *pc;
1287        unsigned long block = (unsigned long)block_s;
1288
1289        debug_log(KERN_INFO "dev: %s, flags: %lx, errors: %d\n",
1290                        rq->rq_disk ? rq->rq_disk->disk_name : "?",
1291                        rq->flags, rq->errors);
1292        debug_log(KERN_INFO "sector: %ld, nr_sectors: %ld, "
1293                        "current_nr_sectors: %d\n", (long)rq->sector,
1294                        rq->nr_sectors, rq->current_nr_sectors);
1295
1296        if (rq->errors >= ERROR_MAX) {
1297                if (floppy->failed_pc != NULL) {
1298                        if (idefloppy_should_report_error(floppy))
1299                                printk(KERN_ERR "ide-floppy: %s: I/O error, pc = %2x,"
1300                                       " key = %2x, asc = %2x, ascq = %2x\n",
1301                                       drive->name, floppy->failed_pc->c[0],
1302                                       floppy->sense_key, floppy->asc, floppy->ascq);
1303                }
1304                else
1305                        printk(KERN_ERR "ide-floppy: %s: I/O error\n",
1306                                drive->name);
1307                idefloppy_do_end_request(drive, 0, 0);
1308                return ide_stopped;
1309        }
1310        if (blk_fs_request(rq)) {
1311                if (((long)rq->sector % floppy->bs_factor) ||
1312                    (rq->nr_sectors % floppy->bs_factor)) {
1313                        printk("%s: unsupported r/w request size\n",
1314                                drive->name);
1315                        idefloppy_do_end_request(drive, 0, 0);
1316                        return ide_stopped;
1317                }
1318                pc = idefloppy_next_pc_storage(drive);
1319                idefloppy_create_rw_cmd(floppy, pc, rq, block);
1320        } else if (blk_special_request(rq)) {
1321                pc = (idefloppy_pc_t *) rq->buffer;
1322        } else if (blk_pc_request(rq)) {
1323                pc = idefloppy_next_pc_storage(drive);
1324                idefloppy_blockpc_cmd(floppy, pc, rq);
1325        } else {
1326                blk_dump_rq_flags(rq,
1327                        "ide-floppy: unsupported command in queue");
1328                idefloppy_do_end_request(drive, 0, 0);
1329                return ide_stopped;
1330        }
1331
1332        pc->rq = rq;
1333        return idefloppy_issue_pc(drive, pc);
1334}
1335
1336/*
1337 *      idefloppy_queue_pc_tail adds a special packet command request to the
1338 *      tail of the request queue, and waits for it to be serviced.
1339 */
1340static int idefloppy_queue_pc_tail (ide_drive_t *drive,idefloppy_pc_t *pc)
1341{
1342        struct ide_floppy_obj *floppy = drive->driver_data;
1343        struct request rq;
1344
1345        ide_init_drive_cmd (&rq);
1346        rq.buffer = (char *) pc;
1347        rq.cmd_type = REQ_TYPE_SPECIAL;
1348        rq.rq_disk = floppy->disk;
1349
1350        return ide_do_drive_cmd(drive, &rq, ide_wait);
1351}
1352
1353/*
1354 *      Look at the flexible disk page parameters. We will ignore the CHS
1355 *      capacity parameters and use the LBA parameters instead.
1356 */
1357static int idefloppy_get_flexible_disk_page (ide_drive_t *drive)
1358{
1359        idefloppy_floppy_t *floppy = drive->driver_data;
1360        idefloppy_pc_t pc;
1361        idefloppy_mode_parameter_header_t *header;
1362        idefloppy_flexible_disk_page_t *page;
1363        int capacity, lba_capacity;
1364
1365        idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE, MODE_SENSE_CURRENT);
1366        if (idefloppy_queue_pc_tail(drive,&pc)) {
1367                printk(KERN_ERR "ide-floppy: Can't get flexible disk "
1368                        "page parameters\n");
1369                return 1;
1370        }
1371        header = (idefloppy_mode_parameter_header_t *) pc.buffer;
1372        floppy->wp = header->wp;
1373        set_disk_ro(floppy->disk, floppy->wp);
1374        page = (idefloppy_flexible_disk_page_t *) (header + 1);
1375
1376        page->transfer_rate = ntohs(page->transfer_rate);
1377        page->sector_size = ntohs(page->sector_size);
1378        page->cyls = ntohs(page->cyls);
1379        page->rpm = ntohs(page->rpm);
1380        capacity = page->cyls * page->heads * page->sectors * page->sector_size;
1381        if (memcmp (page, &floppy->flexible_disk_page, sizeof (idefloppy_flexible_disk_page_t)))
1382                printk(KERN_INFO "%s: %dkB, %d/%d/%d CHS, %d kBps, "
1383                                "%d sector size, %d rpm\n",
1384                        drive->name, capacity / 1024, page->cyls,
1385                        page->heads, page->sectors,
1386                        page->transfer_rate / 8, page->sector_size, page->rpm);
1387
1388        floppy->flexible_disk_page = *page;
1389        drive->bios_cyl = page->cyls;
1390        drive->bios_head = page->heads;
1391        drive->bios_sect = page->sectors;
1392        lba_capacity = floppy->blocks * floppy->block_size;
1393        if (capacity < lba_capacity) {
1394                printk(KERN_NOTICE "%s: The disk reports a capacity of %d "
1395                        "bytes, but the drive only handles %d\n",
1396                        drive->name, lba_capacity, capacity);
1397                floppy->blocks = floppy->block_size ? capacity / floppy->block_size : 0;
1398        }
1399        return 0;
1400}
1401
1402static int idefloppy_get_capability_page(ide_drive_t *drive)
1403{
1404        idefloppy_floppy_t *floppy = drive->driver_data;
1405        idefloppy_pc_t pc;
1406        idefloppy_mode_parameter_header_t *header;
1407        idefloppy_capabilities_page_t *page;
1408
1409        floppy->srfp = 0;
1410        idefloppy_create_mode_sense_cmd(&pc, IDEFLOPPY_CAPABILITIES_PAGE,
1411                                                 MODE_SENSE_CURRENT);
1412
1413        set_bit(PC_SUPPRESS_ERROR, &pc.flags);
1414        if (idefloppy_queue_pc_tail(drive,&pc)) {
1415                return 1;
1416        }
1417
1418        header = (idefloppy_mode_parameter_header_t *) pc.buffer;
1419        page= (idefloppy_capabilities_page_t *)(header+1);
1420        floppy->srfp = page->srfp;
1421        return (0);
1422}
1423
1424/*
1425 *      Determine if a media is present in the floppy drive, and if so,
1426 *      its LBA capacity.
1427 */
1428static int idefloppy_get_capacity (ide_drive_t *drive)
1429{
1430        idefloppy_floppy_t *floppy = drive->driver_data;
1431        idefloppy_pc_t pc;
1432        idefloppy_capacity_header_t *header;
1433        idefloppy_capacity_descriptor_t *descriptor;
1434        int i, descriptors, rc = 1, blocks, length;
1435        
1436        drive->bios_cyl = 0;
1437        drive->bios_head = drive->bios_sect = 0;
1438        floppy->blocks = 0;
1439        floppy->bs_factor = 1;
1440        set_capacity(floppy->disk, 0);
1441
1442        idefloppy_create_read_capacity_cmd(&pc);
1443        if (idefloppy_queue_pc_tail(drive, &pc)) {
1444                printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
1445                return 1;
1446        }
1447        header = (idefloppy_capacity_header_t *) pc.buffer;
1448        descriptors = header->length / sizeof(idefloppy_capacity_descriptor_t);
1449        descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);
1450
1451        for (i = 0; i < descriptors; i++, descriptor++) {
1452                blocks = descriptor->blocks = ntohl(descriptor->blocks);
1453                length = descriptor->length = ntohs(descriptor->length);
1454
1455                if (!i) 
1456                {
1457                switch (descriptor->dc) {
1458                /* Clik! drive returns this instead of CAPACITY_CURRENT */
1459                case CAPACITY_UNFORMATTED:
1460                        if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags))
1461                                /*
1462                                 * If it is not a clik drive, break out
1463                                 * (maintains previous driver behaviour)
1464                                 */
1465                                break;
1466                case CAPACITY_CURRENT:
1467                        /* Normal Zip/LS-120 disks */
1468                        if (memcmp(descriptor, &floppy->capacity, sizeof (idefloppy_capacity_descriptor_t)))
1469                                printk(KERN_INFO "%s: %dkB, %d blocks, %d "
1470                                        "sector size\n", drive->name,
1471                                        blocks * length / 1024, blocks, length);
1472                        floppy->capacity = *descriptor;
1473                        if (!length || length % 512) {
1474                                printk(KERN_NOTICE "%s: %d bytes block size "
1475                                        "not supported\n", drive->name, length);
1476                        } else {
1477                                floppy->blocks = blocks;
1478                                floppy->block_size = length;
1479                                if ((floppy->bs_factor = length / 512) != 1)
1480                                        printk(KERN_NOTICE "%s: warning: non "
1481                                                "512 bytes block size not "
1482                                                "fully supported\n",
1483                                                drive->name);
1484                                rc = 0;
1485                        }
1486                        break;
1487                case CAPACITY_NO_CARTRIDGE:
1488                        /*
1489                         * This is a KERN_ERR so it appears on screen
1490                         * for the user to see
1491                         */
1492                        printk(KERN_ERR "%s: No disk in drive\n", drive->name);
1493                        break;
1494                case CAPACITY_INVALID:
1495                        printk(KERN_ERR "%s: Invalid capacity for disk "
1496                                "in drive\n", drive->name);
1497                        break;
1498                }
1499                }
1500                if (!i) {
1501                        debug_log( "Descriptor 0 Code: %d\n",
1502                                descriptor->dc);
1503                }
1504                debug_log( "Descriptor %d: %dkB, %d blocks, %d "
1505                        "sector size\n", i, blocks * length / 1024, blocks,
1506                        length);
1507        }
1508
1509        /* Clik! disk does not support get_flexible_disk_page */
1510        if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
1511                (void) idefloppy_get_flexible_disk_page(drive);
1512        }
1513
1514        set_capacity(floppy->disk, floppy->blocks * floppy->bs_factor);
1515        return rc;
1516}
1517
1518/*
1519** Obtain the list of formattable capacities.
1520** Very similar to idefloppy_get_capacity, except that we push the capacity
1521** descriptors to userland, instead of our own structures.
1522**
1523** Userland gives us the following structure:
1524**
1525** struct idefloppy_format_capacities {
1526**        int nformats;
1527**        struct {
1528**                int nblocks;
1529**                int blocksize;
1530**                } formats[];
1531**        } ;
1532**
1533** userland initializes nformats to the number of allocated formats[]
1534** records.  On exit we set nformats to the number of records we've
1535** actually initialized.
1536**
1537*/
1538
1539static int idefloppy_get_format_capacities(ide_drive_t *drive, int __user *arg)
1540{
1541        idefloppy_pc_t pc;
1542        idefloppy_capacity_header_t *header;
1543        idefloppy_capacity_descriptor_t *descriptor;
1544        int i, descriptors, blocks, length;
1545        int u_array_size;
1546        int u_index;
1547        int __user *argp;
1548
1549        if (get_user(u_array_size, arg))
1550                return (-EFAULT);
1551
1552        if (u_array_size <= 0)
1553                return (-EINVAL);
1554
1555        idefloppy_create_read_capacity_cmd(&pc);
1556        if (idefloppy_queue_pc_tail(drive, &pc)) {
1557                printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
1558                return (-EIO);
1559        }
1560        header = (idefloppy_capacity_header_t *) pc.buffer;
1561        descriptors = header->length /
1562                sizeof(idefloppy_capacity_descriptor_t);
1563        descriptor = (idefloppy_capacity_descriptor_t *) (header + 1);
1564
1565        u_index = 0;
1566        argp = arg + 1;
1567
1568        /*
1569        ** We always skip the first capacity descriptor.  That's the
1570        ** current capacity.  We are interested in the remaining descriptors,
1571        ** the formattable capacities.
1572        */
1573
1574        for (i=0; i<descriptors; i++, descriptor++) {
1575                if (u_index >= u_array_size)
1576                        break;  /* User-supplied buffer too small */
1577                if (i == 0)
1578                        continue;       /* Skip the first descriptor */
1579
1580                blocks = ntohl(descriptor->blocks);
1581                length = ntohs(descriptor->length);
1582
1583                if (put_user(blocks, argp))
1584                        return(-EFAULT);
1585                ++argp;
1586
1587                if (put_user(length, argp))
1588                        return (-EFAULT);
1589                ++argp;
1590
1591                ++u_index;
1592        }
1593
1594        if (put_user(u_index, arg))
1595                return (-EFAULT);
1596        return (0);
1597}
1598
1599/*
1600** Send ATAPI_FORMAT_UNIT to the drive.
1601**
1602** Userland gives us the following structure:
1603**
1604** struct idefloppy_format_command {
1605**        int nblocks;
1606**        int blocksize;
1607**        int flags;
1608**        } ;
1609**
1610** flags is a bitmask, currently, the only defined flag is:
1611**
1612**        0x01 - verify media after format.
1613*/
1614
1615static int idefloppy_begin_format(ide_drive_t *drive, int __user *arg)
1616{
1617        int blocks;
1618        int length;
1619        int flags;
1620        idefloppy_pc_t pc;
1621
1622        if (get_user(blocks, arg) ||
1623            get_user(length, arg+1) ||
1624            get_user(flags, arg+2)) {
1625                return (-EFAULT);
1626        }
1627
1628        /* Get the SFRP bit */
1629        (void) idefloppy_get_capability_page(drive);
1630        idefloppy_create_format_unit_cmd(&pc, blocks, length, flags);
1631        if (idefloppy_queue_pc_tail(drive, &pc)) {
1632                return (-EIO);
1633        }
1634
1635        return (0);
1636}
1637
1638/*
1639** Get ATAPI_FORMAT_UNIT progress indication.
1640**
1641** Userland gives a pointer to an int.  The int is set to a progress
1642** indicator 0-65536, with 65536=100%.
1643**
1644** If the drive does not support format progress indication, we just check
1645** the dsc bit, and return either 0 or 65536.
1646*/
1647
1648static int idefloppy_get_format_progress(ide_drive_t *drive, int __user *arg)
1649{
1650        idefloppy_floppy_t *floppy = drive->driver_data;
1651        idefloppy_pc_t pc;
1652        int progress_indication = 0x10000;
1653
1654        if (floppy->srfp) {
1655                idefloppy_create_request_sense_cmd(&pc);
1656                if (idefloppy_queue_pc_tail(drive, &pc)) {
1657                        return (-EIO);
1658                }
1659
1660                if (floppy->sense_key == 2 &&
1661                    floppy->asc == 4 &&
1662                    floppy->ascq == 4) {
1663                        progress_indication = floppy->progress_indication;
1664                }
1665                /* Else assume format_unit has finished, and we're
1666                ** at 0x10000 */
1667        } else {
1668                atapi_status_t status;
1669                unsigned long flags;
1670
1671                local_irq_save(flags);
1672                status.all = HWIF(drive)->INB(IDE_STATUS_REG);
1673                local_irq_restore(flags);
1674
1675                progress_indication = !status.b.dsc ? 0 : 0x10000;
1676        }
1677        if (put_user(progress_indication, arg))
1678                return (-EFAULT);
1679
1680        return (0);
1681}
1682
1683/*
1684 *      Return the current floppy capacity.
1685 */
1686static sector_t idefloppy_capacity (ide_drive_t *drive)
1687{
1688        idefloppy_floppy_t *floppy = drive->driver_data;
1689        unsigned long capacity = floppy->blocks * floppy->bs_factor;
1690
1691        return capacity;
1692}
1693
1694/*
1695 *      idefloppy_identify_device checks if we can support a drive,
1696 *      based on the ATAPI IDENTIFY command results.
1697 */
1698static int idefloppy_identify_device (ide_drive_t *drive,struct hd_driveid *id)
1699{
1700        struct idefloppy_id_gcw gcw;
1701#if IDEFLOPPY_DEBUG_INFO
1702        u16 mask,i;
1703        char buffer[80];
1704#endif /* IDEFLOPPY_DEBUG_INFO */
1705
1706        *((u16 *) &gcw) = id->config;
1707
1708#ifdef CONFIG_PPC
1709        /* kludge for Apple PowerBook internal zip */
1710        if ((gcw.device_type == 5) &&
1711            !strstr(id->model, "CD-ROM") &&
1712            strstr(id->model, "ZIP"))
1713                gcw.device_type = 0;                    
1714#endif
1715
1716#if IDEFLOPPY_DEBUG_INFO
1717        printk(KERN_INFO "Dumping ATAPI Identify Device floppy parameters\n");
1718        switch (gcw.protocol) {
1719                case 0: case 1: sprintf(buffer, "ATA");break;
1720                case 2: sprintf(buffer, "ATAPI");break;
1721                case 3: sprintf(buffer, "Reserved (Unknown to ide-floppy)");break;
1722        }
1723        printk(KERN_INFO "Protocol Type: %s\n", buffer);
1724        switch (gcw.device_type) {
1725                case 0: sprintf(buffer, "Direct-access Device");break;
1726                case 1: sprintf(buffer, "Streaming Tape Device");break;
1727                case 2: case 3: case 4: sprintf (buffer, "Reserved");break;
1728                case 5: sprintf(buffer, "CD-ROM Device");break;
1729                case 6: sprintf(buffer, "Reserved");
1730                case 7: sprintf(buffer, "Optical memory Device");break;
1731                case 0x1f: sprintf(buffer, "Unknown or no Device type");break;
1732                default: sprintf(buffer, "Reserved");
1733        }
1734        printk(KERN_INFO "Device Type: %x - %s\n", gcw.device_type, buffer);
1735        printk(KERN_INFO "Removable: %s\n",gcw.removable ? "Yes":"No"); 
1736        switch (gcw.drq_type) {
1737                case 0: sprintf(buffer, "Microprocessor DRQ");break;
1738                case 1: sprintf(buffer, "Interrupt DRQ");break;
1739                case 2: sprintf(buffer, "Accelerated DRQ");break;
1740                case 3: sprintf(buffer, "Reserved");break;
1741        }
1742        printk(KERN_INFO "Command Packet DRQ Type: %s\n", buffer);
1743        switch (gcw.packet_size) {
1744                case 0: sprintf(buffer, "12 bytes");break;
1745                case 1: sprintf(buffer, "16 bytes");break;
1746                default: sprintf(buffer, "Reserved");break;
1747        }
1748        printk(KERN_INFO "Command Packet Size: %s\n", buffer);
1749        printk(KERN_INFO "Model: %.40s\n",id->model);
1750        printk(KERN_INFO "Firmware Revision: %.8s\n",id->fw_rev);
1751        printk(KERN_INFO "Serial Number: %.20s\n",id->serial_no);
1752        printk(KERN_INFO "Write buffer size(?): %d bytes\n",id->buf_size*512);
1753        printk(KERN_INFO "DMA: %s",id->capability & 0x01 ? "Yes\n":"No\n");
1754        printk(KERN_INFO "LBA: %s",id->capability & 0x02 ? "Yes\n":"No\n");
1755        printk(KERN_INFO "IORDY can be disabled: %s",id->capability & 0x04 ? "Yes\n":"No\n");
1756        printk(KERN_INFO "IORDY supported: %s",id->capability & 0x08 ? "Yes\n":"Unknown\n");
1757        printk(KERN_INFO "ATAPI overlap supported: %s",id->capability & 0x20 ? "Yes\n":"No\n");
1758        printk(KERN_INFO "PIO Cycle Timing Category: %d\n",id->tPIO);
1759        printk(KERN_INFO "DMA Cycle Timing Category: %d\n",id->tDMA);
1760        printk(KERN_INFO "Single Word DMA supported modes:\n");
1761        for (i=0,mask=1;i<8;i++,mask=mask << 1) {
1762                if (id->dma_1word & mask)
1763                        printk(KERN_INFO "   Mode %d%s\n", i,
1764                        (id->dma_1word & (mask << 8)) ? " (active)" : "");
1765        }
1766        printk(KERN_INFO "Multi Word DMA supported modes:\n");
1767        for (i=0,mask=1;i<8;i++,mask=mask << 1) {
1768                if (id->dma_mword & mask)
1769                        printk(KERN_INFO "   Mode %d%s\n", i,
1770                        (id->dma_mword & (mask << 8)) ? " (active)" : "");
1771        }
1772        if (id->field_valid & 0x0002) {
1773                printk(KERN_INFO "Enhanced PIO Modes: %s\n",
1774                        id->eide_pio_modes & 1 ? "Mode 3":"None");
1775                if (id->eide_dma_min == 0)
1776                        sprintf(buffer, "Not supported");
1777                else
1778                        sprintf(buffer, "%d ns",id->eide_dma_min);
1779                printk(KERN_INFO "Minimum Multi-word DMA cycle per word: %s\n", buffer);
1780                if (id->eide_dma_time == 0)
1781                        sprintf(buffer, "Not supported");
1782                else
1783                        sprintf(buffer, "%d ns",id->eide_dma_time);
1784                printk(KERN_INFO "Manufacturer\'s Recommended Multi-word cycle: %s\n", buffer);
1785                if (id->eide_pio == 0)
1786                        sprintf(buffer, "Not supported");
1787                else
1788                        sprintf(buffer, "%d ns",id->eide_pio);
1789                printk(KERN_INFO "Minimum PIO cycle without IORDY: %s\n",
1790                        buffer);
1791                if (id->eide_pio_iordy == 0)
1792                        sprintf(buffer, "Not supported");
1793                else
1794                        sprintf(buffer, "%d ns",id->eide_pio_iordy);
1795                printk(KERN_INFO "Minimum PIO cycle with IORDY: %s\n", buffer);
1796        } else
1797                printk(KERN_INFO "According to the device, fields 64-70 are not valid.\n");
1798#endif /* IDEFLOPPY_DEBUG_INFO */
1799
1800        if (gcw.protocol != 2)
1801                printk(KERN_ERR "ide-floppy: Protocol is not ATAPI\n");
1802        else if (gcw.device_type != 0)
1803                printk(KERN_ERR "ide-floppy: Device type is not set to floppy\n");
1804        else if (!gcw.removable)
1805                printk(KERN_ERR "ide-floppy: The removable flag is not set\n");
1806        else if (gcw.drq_type == 3) {
1807                printk(KERN_ERR "ide-floppy: Sorry, DRQ type %d not supported\n", gcw.drq_type);
1808        } else if (gcw.packet_size != 0) {
1809                printk(KERN_ERR "ide-floppy: Packet size is not 12 bytes long\n");
1810        } else
1811                return 1;
1812        return 0;
1813}
1814
1815#ifdef CONFIG_IDE_PROC_FS
1816static void idefloppy_add_settings(ide_drive_t *drive)
1817{
1818        idefloppy_floppy_t *floppy = drive->driver_data;
1819
1820/*
1821 *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
1822 */
1823        ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,           1,              1,      &drive->bios_cyl,       NULL);
1824        ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,            1,              1,      &drive->bios_head,      NULL);
1825        ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,             1,              1,      &drive->bios_sect,      NULL);
1826        ide_add_setting(drive,  "ticks",        SETTING_RW,     TYPE_BYTE,      0,      255,            1,              1,      &floppy->ticks,         NULL);
1827}
1828#else
1829static inline void idefloppy_add_settings(ide_drive_t *drive) { ; }
1830#endif
1831
1832/*
1833 *      Driver initialization.
1834 */
1835static void idefloppy_setup (ide_drive_t *drive, idefloppy_floppy_t *floppy)
1836{
1837        struct idefloppy_id_gcw gcw;
1838
1839        *((u16 *) &gcw) = drive->id->config;
1840        floppy->pc = floppy->pc_stack;
1841        if (gcw.drq_type == 1)
1842                set_bit(IDEFLOPPY_DRQ_INTERRUPT, &floppy->flags);
1843        /*
1844         *      We used to check revisions here. At this point however
1845         *      I'm giving up. Just assume they are all broken, its easier.
1846         *
1847         *      The actual reason for the workarounds was likely
1848         *      a driver bug after all rather than a firmware bug,
1849         *      and the workaround below used to hide it. It should
1850         *      be fixed as of version 1.9, but to be on the safe side
1851         *      we'll leave the limitation below for the 2.2.x tree.
1852         */
1853
1854        if (!strncmp(drive->id->model, "IOMEGA ZIP 100 ATAPI", 20)) {
1855                set_bit(IDEFLOPPY_ZIP_DRIVE, &floppy->flags);
1856                /* This value will be visible in the /proc/ide/hdx/settings */
1857                floppy->ticks = IDEFLOPPY_TICKS_DELAY;
1858                blk_queue_max_sectors(drive->queue, 64);
1859        }
1860
1861        /*
1862        *      Guess what?  The IOMEGA Clik! drive also needs the
1863        *      above fix.  It makes nasty clicking noises without
1864        *      it, so please don't remove this.
1865        */
1866        if (strncmp(drive->id->model, "IOMEGA Clik!", 11) == 0) {
1867                blk_queue_max_sectors(drive->queue, 64);
1868                set_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags);
1869        }
1870
1871
1872        (void) idefloppy_get_capacity(drive);
1873        idefloppy_add_settings(drive);
1874}
1875
1876static void ide_floppy_remove(ide_drive_t *drive)
1877{
1878        idefloppy_floppy_t *floppy = drive->driver_data;
1879        struct gendisk *g = floppy->disk;
1880
1881        ide_proc_unregister_driver(drive, floppy->driver);
1882
1883        del_gendisk(g);
1884
1885        ide_floppy_put(floppy);
1886}
1887
1888static void ide_floppy_release(struct kref *kref)
1889{
1890        struct ide_floppy_obj *floppy = to_ide_floppy(kref);
1891        ide_drive_t *drive = floppy->drive;
1892        struct gendisk *g = floppy->disk;
1893
1894        drive->driver_data = NULL;
1895        g->private_data = NULL;
1896        put_disk(g);
1897        kfree(floppy);
1898}
1899
1900#ifdef CONFIG_IDE_PROC_FS
1901static int proc_idefloppy_read_capacity
1902        (char *page, char **start, off_t off, int count, int *eof, void *data)
1903{
1904        ide_drive_t*drive = (ide_drive_t *)data;
1905        int len;
1906
1907        len = sprintf(page,"%llu\n", (long long)idefloppy_capacity(drive));
1908        PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
1909}
1910
1911static ide_proc_entry_t idefloppy_proc[] = {
1912        { "capacity",   S_IFREG|S_IRUGO,        proc_idefloppy_read_capacity, NULL },
1913        { "geometry",   S_IFREG|S_IRUGO,        proc_ide_read_geometry, NULL },
1914        { NULL, 0, NULL, NULL }
1915};
1916#endif  /* CONFIG_IDE_PROC_FS */
1917
1918static int ide_floppy_probe(ide_drive_t *);
1919
1920static ide_driver_t idefloppy_driver = {
1921        .gen_driver = {
1922                .owner          = THIS_MODULE,
1923                .name           = "ide-floppy",
1924                .bus            = &ide_bus_type,
1925        },
1926        .probe                  = ide_floppy_probe,
1927        .remove                 = ide_floppy_remove,
1928        .version                = IDEFLOPPY_VERSION,
1929        .media                  = ide_floppy,
1930        .supports_dsc_overlap   = 0,
1931        .do_request             = idefloppy_do_request,
1932        .end_request            = idefloppy_do_end_request,
1933        .error                  = __ide_error,
1934        .abort                  = __ide_abort,
1935#ifdef CONFIG_IDE_PROC_FS
1936        .proc                   = idefloppy_proc,
1937#endif
1938};
1939
1940static int idefloppy_open(struct inode *inode, struct file *filp)
1941{
1942        struct gendisk *disk = inode->i_bdev->bd_disk;
1943        struct ide_floppy_obj *floppy;
1944        ide_drive_t *drive;
1945        idefloppy_pc_t pc;
1946        int ret = 0;
1947
1948        debug_log(KERN_INFO "Reached idefloppy_open\n");
1949
1950        if (!(floppy = ide_floppy_get(disk)))
1951                return -ENXIO;
1952
1953        drive = floppy->drive;
1954
1955        floppy->openers++;
1956
1957        if (floppy->openers == 1) {
1958                clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
1959                /* Just in case */
1960
1961                idefloppy_create_test_unit_ready_cmd(&pc);
1962                if (idefloppy_queue_pc_tail(drive, &pc)) {
1963                        idefloppy_create_start_stop_cmd(&pc, 1);
1964                        (void) idefloppy_queue_pc_tail(drive, &pc);
1965                }
1966
1967                if (idefloppy_get_capacity (drive)
1968                   && (filp->f_flags & O_NDELAY) == 0
1969                    /*
1970                    ** Allow O_NDELAY to open a drive without a disk, or with
1971                    ** an unreadable disk, so that we can get the format
1972                    ** capacity of the drive or begin the format - Sam
1973                    */
1974                    ) {
1975                        ret = -EIO;
1976                        goto out_put_floppy;
1977                }
1978
1979                if (floppy->wp && (filp->f_mode & 2)) {
1980                        ret = -EROFS;
1981                        goto out_put_floppy;
1982                }
1983                set_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
1984                /* IOMEGA Clik! drives do not support lock/unlock commands */
1985                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
1986                        idefloppy_create_prevent_cmd(&pc, 1);
1987                        (void) idefloppy_queue_pc_tail(drive, &pc);
1988                }
1989                check_disk_change(inode->i_bdev);
1990        } else if (test_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags)) {
1991                ret = -EBUSY;
1992                goto out_put_floppy;
1993        }
1994        return 0;
1995
1996out_put_floppy:
1997        floppy->openers--;
1998        ide_floppy_put(floppy);
1999        return ret;
2000}
2001
2002static int idefloppy_release(struct inode *inode, struct file *filp)
2003{
2004        struct gendisk *disk = inode->i_bdev->bd_disk;
2005        struct ide_floppy_obj *floppy = ide_floppy_g(disk);
2006        ide_drive_t *drive = floppy->drive;
2007        idefloppy_pc_t pc;
2008        
2009        debug_log(KERN_INFO "Reached idefloppy_release\n");
2010
2011        if (floppy->openers == 1) {
2012                /* IOMEGA Clik! drives do not support lock/unlock commands */
2013                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
2014                        idefloppy_create_prevent_cmd(&pc, 0);
2015                        (void) idefloppy_queue_pc_tail(drive, &pc);
2016                }
2017
2018                clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
2019        }
2020
2021        floppy->openers--;
2022
2023        ide_floppy_put(floppy);
2024
2025        return 0;
2026}
2027
2028static int idefloppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
2029{
2030        struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
2031        ide_drive_t *drive = floppy->drive;
2032
2033        geo->heads = drive->bios_head;
2034        geo->sectors = drive->bios_sect;
2035        geo->cylinders = (u16)drive->bios_cyl; /* truncate */
2036        return 0;
2037}
2038
2039static int idefloppy_ioctl(struct inode *inode, struct file *file,
2040                        unsigned int cmd, unsigned long arg)
2041{
2042        struct block_device *bdev = inode->i_bdev;
2043        struct ide_floppy_obj *floppy = ide_floppy_g(bdev->bd_disk);
2044        ide_drive_t *drive = floppy->drive;
2045        void __user *argp = (void __user *)arg;
2046        int err;
2047        int prevent = (arg) ? 1 : 0;
2048        idefloppy_pc_t pc;
2049
2050        switch (cmd) {
2051        case CDROMEJECT:
2052                prevent = 0;
2053                /* fall through */
2054        case CDROM_LOCKDOOR:
2055                if (floppy->openers > 1)
2056                        return -EBUSY;
2057
2058                /* The IOMEGA Clik! Drive doesn't support this command - no room for an eject mechanism */
2059                if (!test_bit(IDEFLOPPY_CLIK_DRIVE, &floppy->flags)) {
2060                        idefloppy_create_prevent_cmd(&pc, prevent);
2061                        (void) idefloppy_queue_pc_tail(drive, &pc);
2062                }
2063                if (cmd == CDROMEJECT) {
2064                        idefloppy_create_start_stop_cmd(&pc, 2);
2065                        (void) idefloppy_queue_pc_tail(drive, &pc);
2066                }
2067                return 0;
2068        case IDEFLOPPY_IOCTL_FORMAT_SUPPORTED:
2069                return 0;
2070        case IDEFLOPPY_IOCTL_FORMAT_GET_CAPACITY:
2071                return idefloppy_get_format_capacities(drive, argp);
2072        case IDEFLOPPY_IOCTL_FORMAT_START:
2073
2074                if (!(file->f_mode & 2))
2075                        return -EPERM;
2076
2077                if (floppy->openers > 1) {
2078                        /* Don't format if someone is using the disk */
2079
2080                        clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS,
2081                                  &floppy->flags);
2082                        return -EBUSY;
2083                }
2084
2085                set_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
2086
2087                err = idefloppy_begin_format(drive, argp);
2088                if (err)
2089                        clear_bit(IDEFLOPPY_FORMAT_IN_PROGRESS, &floppy->flags);
2090                return err;
2091                /*
2092                ** Note, the bit will be cleared when the device is
2093                ** closed.  This is the cleanest way to handle the
2094                ** situation where the drive does not support
2095                ** format progress reporting.
2096                */
2097        case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
2098                return idefloppy_get_format_progress(drive, argp);
2099        }
2100
2101        /*
2102         * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
2103         * and CDROM_SEND_PACKET (legacy) ioctls
2104         */
2105        if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
2106                err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
2107                                        bdev->bd_disk, cmd, argp);
2108        else
2109                err = -ENOTTY;
2110
2111        if (err == -ENOTTY)
2112                err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
2113
2114        return err;
2115}
2116
2117static int idefloppy_media_changed(struct gendisk *disk)
2118{
2119        struct ide_floppy_obj *floppy = ide_floppy_g(disk);
2120        ide_drive_t *drive = floppy->drive;
2121
2122        /* do not scan partitions twice if this is a removable device */
2123        if (drive->attach) {
2124                drive->attach = 0;
2125                return 0;
2126        }
2127        return test_and_clear_bit(IDEFLOPPY_MEDIA_CHANGED, &floppy->flags);
2128}
2129
2130static int idefloppy_revalidate_disk(struct gendisk *disk)
2131{
2132        struct ide_floppy_obj *floppy = ide_floppy_g(disk);
2133        set_capacity(disk, idefloppy_capacity(floppy->drive));
2134        return 0;
2135}
2136
2137static struct block_device_operations idefloppy_ops = {
2138        .owner          = THIS_MODULE,
2139        .open           = idefloppy_open,
2140        .release        = idefloppy_release,
2141        .ioctl          = idefloppy_ioctl,
2142        .getgeo         = idefloppy_getgeo,
2143        .media_changed  = idefloppy_media_changed,
2144        .revalidate_disk= idefloppy_revalidate_disk
2145};
2146
2147static int ide_floppy_probe(ide_drive_t *drive)
2148{
2149        idefloppy_floppy_t *floppy;
2150        struct gendisk *g;
2151
2152        if (!strstr("ide-floppy", drive->driver_req))
2153                goto failed;
2154        if (!drive->present)
2155                goto failed;
2156        if (drive->media != ide_floppy)
2157                goto failed;
2158        if (!idefloppy_identify_device (drive, drive->id)) {
2159                printk (KERN_ERR "ide-floppy: %s: not supported by this version of ide-floppy\n", drive->name);
2160                goto failed;
2161        }
2162        if (drive->scsi) {
2163                printk("ide-floppy: passing drive %s to ide-scsi emulation.\n", drive->name);
2164                goto failed;
2165        }
2166        if ((floppy = kzalloc(sizeof (idefloppy_floppy_t), GFP_KERNEL)) == NULL) {
2167                printk (KERN_ERR "ide-floppy: %s: Can't allocate a floppy structure\n", drive->name);
2168                goto failed;
2169        }
2170
2171        g = alloc_disk(1 << PARTN_BITS);
2172        if (!g)
2173                goto out_free_floppy;
2174
2175        ide_init_disk(g, drive);
2176
2177        ide_proc_register_driver(drive, &idefloppy_driver);
2178
2179        kref_init(&floppy->kref);
2180
2181        floppy->drive = drive;
2182        floppy->driver = &idefloppy_driver;
2183        floppy->disk = g;
2184
2185        g->private_data = &floppy->driver;
2186
2187        drive->driver_data = floppy;
2188
2189        idefloppy_setup (drive, floppy);
2190
2191        g->minors = 1 << PARTN_BITS;
2192        g->driverfs_dev = &drive->gendev;
2193        g->flags = drive->removable ? GENHD_FL_REMOVABLE : 0;
2194        g->fops = &idefloppy_ops;
2195        drive->attach = 1;
2196        add_disk(g);
2197        return 0;
2198
2199out_free_floppy:
2200        kfree(floppy);
2201failed:
2202        return -ENODEV;
2203}
2204
2205MODULE_DESCRIPTION("ATAPI FLOPPY Driver");
2206
2207static void __exit idefloppy_exit (void)
2208{
2209        driver_unregister(&idefloppy_driver.gen_driver);
2210}
2211
2212static int __init idefloppy_init(void)
2213{
2214        printk("ide-floppy driver " IDEFLOPPY_VERSION "\n");
2215        return driver_register(&idefloppy_driver.gen_driver);
2216}
2217
2218MODULE_ALIAS("ide:*m-floppy*");
2219module_init(idefloppy_init);
2220module_exit(idefloppy_exit);
2221MODULE_LICENSE("GPL");
2222
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