root/drivers/block/floppy.c

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DEFINITIONS

This source file includes following definitions.
  1. set_debugt
  2. debugt
  3. disk_change
  4. is_selected
  5. set_dor
  6. twaddle
  7. reset_fdc_info
  8. set_fdc
  9. lock_fdc
  10. unlock_fdc
  11. motor_off_callback
  12. floppy_off
  13. scandrives
  14. fd_watchdog
  15. main_command_interrupt
  16. wait_for_completion
  17. floppy_disable_hlt
  18. floppy_enable_hlt
  19. setup_DMA
  20. output_byte
  21. result
  22. perpendicular_mode
  23. fdc_specify
  24. fdc_dtr
  25. tell_sector
  26. interpret_errors
  27. setup_rw_floppy
  28. seek_interrupt
  29. check_wp
  30. seek_floppy
  31. recal_interrupt
  32. unexpected_floppy_interrupt
  33. floppy_interrupt
  34. recalibrate_floppy
  35. reset_interrupt
  36. reset_fdc
  37. empty
  38. show_floppy
  39. floppy_shutdown
  40. start_motor
  41. floppy_ready
  42. floppy_start
  43. do_wakeup
  44. wait_til_done
  45. generic_done
  46. generic_success
  47. generic_failure
  48. success_and_wakeup
  49. failure_and_wakeup
  50. next_valid_format
  51. bad_flp_intr
  52. set_floppy
  53. format_interrupt
  54. setup_format_params
  55. redo_format
  56. do_format
  57. request_done
  58. rw_interrupt
  59. buffer_chain_size
  60. transfer_size
  61. copy_buffer
  62. make_raw_rw_request
  63. redo_fd_request
  64. process_fd_request
  65. do_fd_request
  66. poll_drive
  67. reset_intr
  68. user_reset_fdc
  69. fd_copyout
  70. drive_name
  71. raw_cmd_ioctl
  72. invalidate_drive
  73. fd_ioctl
  74. config_types
  75. floppy_read
  76. floppy_write
  77. floppy_release
  78. floppy_open
  79. check_floppy_change
  80. floppy_revalidate
  81. get_fdc_version
  82. floppy_invert_dcl
  83. daring
  84. allow_drives
  85. fdc2_adr
  86. unex
  87. set_cmos
  88. floppy_setup
  89. new_floppy_init
  90. floppy_init
  91. floppy_grab_irq_and_dma
  92. floppy_release_irq_and_dma

   1 /*
   2  *  linux/kernel/floppy.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1993, 1994  Alain Knaff
   6  */
   7 /*
   8  * 02.12.91 - Changed to static variables to indicate need for reset
   9  * and recalibrate. This makes some things easier (output_byte reset
  10  * checking etc), and means less interrupt jumping in case of errors,
  11  * so the code is hopefully easier to understand.
  12  */
  13 
  14 /*
  15  * This file is certainly a mess. I've tried my best to get it working,
  16  * but I don't like programming floppies, and I have only one anyway.
  17  * Urgel. I should check for more errors, and do more graceful error
  18  * recovery. Seems there are problems with several drives. I've tried to
  19  * correct them. No promises.
  20  */
  21 
  22 /*
  23  * As with hd.c, all routines within this file can (and will) be called
  24  * by interrupts, so extreme caution is needed. A hardware interrupt
  25  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  26  * call "floppy-on" directly, but have to set a special timer interrupt
  27  * etc.
  28  */
  29 
  30 /*
  31  * 28.02.92 - made track-buffering routines, based on the routines written
  32  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  33  */
  34 
  35 /*
  36  * Automatic floppy-detection and formatting written by Werner Almesberger
  37  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  38  * the floppy-change signal detection.
  39  */
  40 
  41 /*
  42  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  43  * FDC data overrun bug, added some preliminary stuff for vertical
  44  * recording support.
  45  *
  46  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  47  *
  48  * TODO: Errors are still not counted properly.
  49  */
  50 
  51 /* 1992/9/20
  52  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  53  * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
  54  * Christoph H. Hochst\"atter.
  55  * I have fixed the shift values to the ones I always use. Maybe a new
  56  * ioctl() should be created to be able to modify them.
  57  * There is a bug in the driver that makes it impossible to format a
  58  * floppy as the first thing after bootup.
  59  */
  60 
  61 /*
  62  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  63  * this helped the floppy driver as well. Much cleaner, and still seems to
  64  * work.
  65  */
  66 
  67 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  68  * minor modifications to allow 2.88 floppies to be run.
  69  */
  70 
  71 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
  72  * disk types.
  73  */
  74 
  75 /*
  76  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
  77  * format bug fixes, but unfortunately some new bugs too...
  78  */
  79 
  80 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 
  81  * errors to allow safe writing by specialized programs.
  82  */
  83 
  84 #define CONFIG_FLOPPY_SANITY
  85 #undef  CONFIG_FLOPPY_SILENT_DCL_CLEAR
  86 
  87 #define REALLY_SLOW_IO
  88 
  89 #define DEBUGT 2
  90 #define DCL_DEBUG /* debug disk change line */
  91 
  92 #include <linux/config.h>
  93 
  94 /* do print messages for unexpected interrupts */
  95 static int print_unex=1;
  96 
  97 #ifndef FD_MODULE
  98 /* the following is the mask of allowed drives. By default units 2 and
  99  * 3 of both floppy controllers are disabled, because switching on the
 100  * motor of these drives causes system hangs on some PCI computers. drive
 101  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 102  * a drive is allowed. */
 103 static int ALLOWED_DRIVE_MASK=0x33;
 104 
 105 #define FLOPPY_IRQ 6
 106 #define FLOPPY_DMA 2
 107 #define FDC1 0x3f0
 108 static int FDC2=-1;
 109 #endif
 110 
 111 #define MODULE_AWARE_DRIVER
 112 
 113 #include <linux/sched.h>
 114 #include <linux/fs.h>
 115 #include <linux/kernel.h>
 116 #include <linux/timer.h>
 117 #include <linux/tqueue.h>
 118 #define FDPATCHES
 119 #include <linux/fdreg.h>
 120 #include <linux/fd.h>
 121 #include <linux/errno.h>
 122 #include <linux/malloc.h>
 123 #include <linux/string.h>
 124 #include <linux/fcntl.h>
 125 #include <linux/delay.h>
 126 #include <linux/mc146818rtc.h> /* CMOS defines */
 127 
 128 #include <asm/dma.h>
 129 #include <asm/irq.h>
 130 #include <asm/system.h>
 131 #include <asm/io.h>
 132 #include <asm/segment.h>
 133 
 134 #define MAJOR_NR FLOPPY_MAJOR
 135 #include "blk.h"
 136 
 137 static unsigned int fake_change = 0;
 138 static int initialising=1;
 139 
 140 #define FLOPPY0_TYPE    ((CMOS_READ(0x10) >> 4) & 15)
 141 #define FLOPPY1_TYPE    (CMOS_READ(0x10) & 15)
 142 
 143 /*
 144  * Again, the CMOS information doesn't work on the alpha..
 145  */
 146 #ifdef __alpha__
 147 #undef FLOPPY0_TYPE
 148 #undef FLOPPY1_TYPE
 149 #define FLOPPY0_TYPE 6
 150 #define FLOPPY1_TYPE 0
 151 #endif
 152 
 153 #define N_FDC 2
 154 #define N_DRIVE 8
 155 
 156 #define TYPE(x) ( ((x)>>2) & 0x1f )
 157 #define DRIVE(x) ( ((x)&0x03) | (((x)&0x80 ) >> 5))
 158 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 159 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 160 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 161                                 /* reverse mapping from unit and fdc to drive */
 162 #define DP (&drive_params[current_drive])
 163 #define DRS (&drive_state[current_drive])
 164 #define DRWE (&write_errors[current_drive])
 165 #define FDCS (&fdc_state[fdc])
 166 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 167 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 168 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 169 
 170 #define UDP (&drive_params[drive])
 171 #define UDRS (&drive_state[drive])
 172 #define UDRWE (&write_errors[drive])
 173 #define UFDCS (&fdc_state[FDC(drive)])
 174 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 175 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 176 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 177 
 178 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 179 
 180 #define DPRINT1(x,x1) \
 181 printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 182 
 183 #define DPRINT2(x,x1,x2) \
 184 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 185 
 186 #define DPRINT3(x,x1,x2,x3) \
 187 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 188 
 189 /* read/write */
 190 #define COMMAND raw_cmd.cmd[0]
 191 #define DR_SELECT raw_cmd.cmd[1]
 192 #define TRACK raw_cmd.cmd[2]
 193 #define HEAD raw_cmd.cmd[3]
 194 #define SECTOR raw_cmd.cmd[4]
 195 #define SIZECODE raw_cmd.cmd[5]
 196 #define SECT_PER_TRACK raw_cmd.cmd[6]
 197 #define GAP raw_cmd.cmd[7]
 198 #define SIZECODE2 raw_cmd.cmd[8]
 199 #define NR_RW 9
 200 
 201 /* format */
 202 #define F_SIZECODE raw_cmd.cmd[2]
 203 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 204 #define F_GAP raw_cmd.cmd[4]
 205 #define F_FILL raw_cmd.cmd[5]
 206 #define NR_F 6
 207 
 208 /*
 209  * Maximum disk size (in kilobytes). This default is used whenever the
 210  * current disk size is unknown.
 211  * [Now it is rather a minimum]
 212  */
 213 #define MAX_DISK_SIZE 2 /* 3984*/
 214 
 215 
 216 
 217 /*
 218  * The DMA channel used by the floppy controller cannot access data at
 219  * addresses >= 16MB
 220  *
 221  * Went back to the 1MB limit, as some people had problems with the floppy
 222  * driver otherwise. It doesn't matter much for performance anyway, as most
 223  * floppy accesses go through the track buffer.
 224  */
 225 #define LAST_DMA_ADDR   (0x1000000)
 226 #define K_64 (0x10000) /* 64 k */
 227 
 228 /*
 229  * globals used by 'result()'
 230  */
 231 #define MAX_REPLIES 10
 232 static unsigned char reply_buffer[MAX_REPLIES];
 233 static int inr; /* size of reply buffer, when called from interrupt */
 234 #define ST0 (reply_buffer[0])
 235 #define ST1 (reply_buffer[1])
 236 #define ST2 (reply_buffer[2])
 237 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 238 #define R_TRACK (reply_buffer[3])
 239 #define R_HEAD (reply_buffer[4])
 240 #define R_SECTOR (reply_buffer[5])
 241 #define R_SIZECODE (reply_buffer[6])
 242 
 243 #define SEL_DLY (2*HZ/100)
 244 
 245 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 246 /*
 247  * this struct defines the different floppy drive types.
 248  */
 249 static struct {
 250         struct floppy_drive_params params;
 251         char *name; /* name printed while booting */
 252 } default_drive_params[]= {
 253 /* NOTE: the time values in jiffies should be in msec!
 254  CMOS drive type
 255   |     Maximum data rate supported by drive type
 256   |     |   Head load time, msec
 257   |     |   |   Head unload time, msec (not used)
 258   |     |   |   |     Step rate interval, usec
 259   |     |   |   |     |       Time needed for spinup time (jiffies)
 260   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 261   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 262   |     |   |   |     |       |      |   |     Select delay
 263   |     |   |   |     |       |      |   |     |     RPS
 264   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 265   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 266   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 267   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 268 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 269       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 270 
 271 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 272       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 273 
 274 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 275       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 276 
 277 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 278       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 279 
 280 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 281       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 282 
 283 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 284       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 285 
 286 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 287       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 288 /*    |  ---autodetected formats--   |      |      |
 289       read_track                     |      |    Name printed when booting
 290                                      |     Native format
 291                                    Frequency of disk change checks */
 292 };
 293 
 294 static struct floppy_drive_params drive_params[N_DRIVE];
 295 static struct floppy_drive_struct drive_state[N_DRIVE];
 296 static struct floppy_write_errors write_errors[N_DRIVE];
 297 static struct floppy_raw_cmd raw_cmd;
 298 
 299 /*
 300  * This struct defines the different floppy types.
 301  *
 302  * The 'stretch' tells if the tracks need to be doubled for some
 303  * types (ie 360kB diskette in 1.2MB drive etc). Others should
 304  * be self-explanatory.
 305  */
 306 static struct floppy_struct floppy_type[32] = {
 307         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 308         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 309         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 310         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 311         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 312         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 313         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 314         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 315         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 316         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 317 
 318         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 319         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 320         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 321         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 322         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 323         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 324         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 325         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 326         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 327         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 328 
 329         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 330         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 331         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 332         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 333         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 334         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 335         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 336         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 337         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 338 
 339         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 340         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 341         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 342 };
 343 
 344 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 345 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 346 
 347 /* Auto-detection: Disk type used until the next media change occurs. */
 348 struct floppy_struct *current_type[N_DRIVE] = {
 349         NULL, NULL, NULL, NULL,
 350         NULL, NULL, NULL, NULL
 351 };
 352 
 353 /*
 354  * User-provided type information. current_type points to
 355  * the respective entry of this array.
 356  */
 357 struct floppy_struct user_params[N_DRIVE];
 358 
 359 static int floppy_sizes[256];
 360 static int floppy_blocksizes[256] = { 0, };
 361 
 362 /*
 363  * The driver is trying to determine the correct media format
 364  * while probing is set. rw_interrupt() clears it after a
 365  * successful access.
 366  */
 367 static int probing = 0;
 368 
 369 /* Synchronization of FDC access. */
 370 #define FD_COMMAND_DETECT -2
 371 #define FD_COMMAND_NONE -1
 372 #define FD_COMMAND_ERROR 2
 373 #define FD_COMMAND_OKAY 3
 374 
 375 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 376 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 377 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 378 #define CALL(x) if( (x) == -EINTR) return -EINTR;
 379 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 380 #define WAIT(x) _WAIT((x),interruptible)
 381 #define IWAIT(x) _WAIT((x),1)
 382 
 383 /* Errors during formatting are counted here. */
 384 static int format_errors;
 385 
 386 /* Format request descriptor. */
 387 static struct format_descr format_req;
 388 
 389 /*
 390  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 391  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 392  * H is head unload time (1=16ms, 2=32ms, etc)
 393  */
 394 
 395 /*
 396  * Track buffer
 397  * Because these are written to by the DMA controller, they must
 398  * not contain a 64k byte boundary crossing, or data will be
 399  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 400  * Note that you must not change the sizes below without updating head.S.
 401  */
 402 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 403 #define max_buffer_sectors MAX_BUFFER_SECTORS
 404 
 405 int *errors;
 406 typedef void (*done_f)(int);
 407 struct cont_t {
 408 void (*interrupt)(void); /* this is called after the interrupt of the
 409                           * main command */
 410 void (*redo)(void); /* this is called to retry the operation */
 411 void (*error)(void); /* this is called to tally an error */
 412 done_f done; /* this is called to say if the operation has succeeded/failed */
 413 } *cont;
 414 
 415 static void floppy_ready(void);
 416 static void floppy_start(void);
 417 static void process_fd_request(void);
 418 static void recalibrate_floppy(void);
 419 static void floppy_shutdown(void);
 420 
 421 static int floppy_grab_irq_and_dma(void);
 422 static void floppy_release_irq_and_dma(void);
 423 
 424 /*
 425  * The "reset" variable should be tested whenever an interrupt is scheduled,
 426  * after the commands have been sent. This is to ensure that the driver doesn't
 427  * get wedged when the interrupt doesn't come because of a failed command.
 428  * reset doesn't need to be tested before sending commands, because
 429  * output_byte is automatically disabled when reset is set.
 430  */
 431 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 432 static void reset_fdc(void);
 433 
 434 /*
 435  * These are global variables, as that's the easiest way to give
 436  * information to interrupts. They are the data used for the current
 437  * request.
 438  */
 439 #define NO_TRACK -1
 440 #define NEED_1_RECAL -2
 441 #define NEED_2_RECAL -3
 442 
 443 /* */
 444 static int usage_count = 0;
 445 
 446 
 447 /* buffer related variables */
 448 static int buffer_track = -1;
 449 static int buffer_drive = -1;
 450 static int buffer_min = -1;
 451 static int buffer_max = -1;
 452 
 453 /* fdc related variables, should end up in a struct */
 454 static struct floppy_fdc_state fdc_state[N_FDC];
 455 static int fdc; /* current fdc */
 456 
 457 static struct floppy_struct * floppy = floppy_type;
 458 static unsigned char current_drive = 0;
 459 static long current_count_sectors = 0;
 460 static char *current_addr = 0;
 461 static unsigned char sector_t; /* sector in track */
 462 
 463 #ifdef DEBUGT
 464 long unsigned debugtimer;
 465 #endif
 466 
 467 /*
 468  * Debugging
 469  * =========
 470  */
 471 static inline void set_debugt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 472 {
 473 #ifdef DEBUGT
 474         debugtimer = jiffies;
 475 #endif
 476 }
 477 
 478 static inline void debugt(char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 479 {
 480 #ifdef DEBUGT
 481   if ( DP->flags & DEBUGT )
 482         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 483 #endif
 484 }
 485 
 486 /*
 487  * Bottom half floppy driver.
 488  * ==========================
 489  *
 490  * This part of the file contains the code talking directly to the hardware,
 491  * and also the main service loop (seek-configure-spinup-command)
 492  */
 493 
 494 /*
 495  * disk change.
 496  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 497  * and the last_checked date.
 498  *
 499  * last_checked is the date of the last check which showed 'no disk change'
 500  * FD_DISK_CHANGE is set under two conditions:
 501  * 1. The floppy has been changed after some i/o to that floppy already
 502  *    took place.
 503  * 2. No floppy disk is in the drive. This is done in order to ensure that
 504  *    requests are quickly flushed in case there is no disk in the drive. It
 505  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 506  *    the drive.
 507  *
 508  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 509  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 510  *  each seek. If a disk is present, the disk change line should also be
 511  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 512  *  change line is set, this means either that no disk is in the drive, or
 513  *  that it has been removed since the last seek.
 514  *
 515  * This means that we really have a third possibility too:
 516  *  The floppy has been changed after the last seek.
 517  */
 518 
 519 static int disk_change(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 520 {
 521         int fdc=FDC(drive);
 522 #ifdef CONFIG_FLOPPY_SANITY
 523         if(jiffies < UDP->select_delay + UDRS->select_date)
 524                 DPRINT("WARNING disk change called early\n");
 525         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 526            (FDCS->dor & 3) != UNIT(drive) ||
 527            fdc != FDC(drive)){
 528                 DPRINT("probing disk change on unselected drive\n");
 529                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 530                         FDCS->dor);
 531         }
 532 #endif
 533 
 534 #ifdef DCL_DEBUG
 535         if (UDP->flags & FD_DEBUG){
 536                 DPRINT1("checking disk change line for drive %d\n",drive);
 537                 DPRINT1("jiffies=%ld\n", jiffies);
 538                 DPRINT1("disk change line=%x\n",inb_p(FD_DIR)&0x80);
 539                 DPRINT1("flags=%x\n",UDRS->flags);
 540         }
 541 #endif
 542         if (UDP->flags & FD_BROKEN_DCL)
 543                 return UTESTF(FD_DISK_CHANGED);
 544         if( (inb_p(FD_DIR) ^ UDP->flags) & 0x80){
 545                 USETF(FD_VERIFY); /* verify write protection */         
 546                 if(UDRS->maxblock){
 547                         /* mark it changed */
 548                         USETF(FD_DISK_CHANGED);
 549 
 550                         /* invalidate its geometry */
 551                         if (UDRS->keep_data >= 0) {
 552                                 if ((UDP->flags & FTD_MSG) &&
 553                                     current_type[drive] != NULL)
 554                                         DPRINT("Disk type is undefined after "
 555                                                "disk change\n");
 556                                 current_type[drive] = NULL;
 557                                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] = MAX_DISK_SIZE;
 558                         }
 559                 }
 560                 /*USETF(FD_DISK_NEWCHANGE);*/
 561                 return 1;
 562         } else {
 563                 UDRS->last_checked=jiffies;
 564                 UCLEARF(FD_DISK_NEWCHANGE);
 565         }
 566         return 0;
 567 }
 568 
 569 static inline int is_selected(int dor, int unit)
     /* [previous][next][first][last][top][bottom][index][help] */
 570 {
 571         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 572 }
 573 
 574 static int set_dor(int fdc, char mask, char data)
     /* [previous][next][first][last][top][bottom][index][help] */
 575 {
 576         register unsigned char drive, unit, newdor,olddor;
 577 
 578         if(FDCS->address == -1)
 579                 return -1;
 580 
 581         olddor = FDCS->dor;
 582         newdor =  (olddor & mask) | data;
 583         if ( newdor != olddor ){
 584                 unit = olddor & 0x3;
 585                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 586                         drive = REVDRIVE(fdc,unit);
 587 #ifdef DCL_DEBUG
 588         if (UDP->flags & FD_DEBUG){
 589                 DPRINT("calling disk change from set_dor\n");
 590         }
 591 #endif
 592                         disk_change(drive);
 593                 }
 594                 FDCS->dor = newdor;
 595                 outb_p(newdor, FD_DOR);
 596 
 597                 unit = newdor & 0x3;
 598                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 599                         drive = REVDRIVE(fdc,unit);
 600                         UDRS->select_date = jiffies;
 601                 }
 602         }
 603         if ( newdor & 0xf0 )
 604                 floppy_grab_irq_and_dma();
 605         if( olddor & 0xf0 )
 606                 floppy_release_irq_and_dma();
 607         return olddor;
 608 }
 609 
 610 static void twaddle(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 611 {
 612         if (DP->select_delay)
 613                 return;
 614         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 615         outb_p(FDCS->dor, FD_DOR);
 616         DRS->select_date = jiffies;
 617 }
 618 
 619 /* reset all driver information about the current fdc. This is needed after
 620  * a reset, and after a raw command. */
 621 static void reset_fdc_info(int mode)
     /* [previous][next][first][last][top][bottom][index][help] */
 622 {
 623         int drive;
 624 
 625         FDCS->spec1 = FDCS->spec2 = -1;
 626         FDCS->need_configure = 1;
 627         FDCS->perp_mode = 1;
 628         FDCS->rawcmd = 0;
 629         for ( drive = 0; drive < N_DRIVE; drive++)
 630                 if (FDC(drive) == fdc &&
 631                     ( mode || UDRS->track != NEED_1_RECAL))
 632                         UDRS->track = NEED_2_RECAL;
 633 }
 634 
 635 /* selects the fdc and drive, and enables the fdc's input/dma. */
 636 static void set_fdc(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 637 {
 638         if (drive >= 0 && drive < N_DRIVE){
 639                 fdc = FDC(drive);
 640                 current_drive = drive;
 641         }
 642         set_dor(fdc,~0,8);
 643         set_dor(1-fdc, ~8, 0);
 644         if ( FDCS->rawcmd == 2 )
 645                 reset_fdc_info(1);
 646         if( inb_p(FD_STATUS) != STATUS_READY )
 647                 FDCS->reset = 1;
 648 }
 649 
 650 /* locks the driver */
 651 static int lock_fdc(int drive, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
 652 {
 653         if(!usage_count){
 654                 printk("trying to lock fdc while usage count=0\n");
 655                 return -1;
 656         }
 657         floppy_grab_irq_and_dma();
 658         if (!current->pid)
 659                 run_task_queue(&tq_timer);
 660         cli();
 661         while (fdc_busy && NO_SIGNAL)
 662                 interruptible_sleep_on(&fdc_wait);
 663         if(fdc_busy){
 664                 sti();
 665                 return -EINTR;
 666         }
 667         fdc_busy = 1;
 668         sti();
 669         command_status = FD_COMMAND_NONE;
 670         set_fdc(drive);
 671         return 0;
 672 }
 673 
 674 #define LOCK_FDC(drive,interruptible) \
 675 if(lock_fdc(drive,interruptible)) return -EINTR;
 676 
 677 typedef void (*timeout_fn)(unsigned long);
 678 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0, 
 679                                                (timeout_fn) floppy_shutdown };
 680 
 681 /* unlocks the driver */
 682 static inline void unlock_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 683 {
 684         if (!fdc_busy)
 685                 DPRINT("FDC access conflict!\n");
 686 
 687         if ( DEVICE_INTR )
 688                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 689                         DEVICE_INTR);
 690         command_status = FD_COMMAND_NONE;
 691         del_timer(&fd_timeout);
 692         fdc_busy = 0;
 693         floppy_release_irq_and_dma();
 694         wake_up(&fdc_wait);
 695 }
 696 
 697 /* switches the motor off after a given timeout */
 698 static void motor_off_callback(unsigned long nr)
     /* [previous][next][first][last][top][bottom][index][help] */
 699 {
 700         unsigned char mask = ~(0x10 << UNIT(nr));
 701 
 702         set_dor( FDC(nr), mask, 0 );
 703 }
 704 
 705 static struct timer_list motor_off_timer[N_DRIVE] = {
 706         { NULL, NULL, 0, 0, motor_off_callback },
 707         { NULL, NULL, 0, 1, motor_off_callback },
 708         { NULL, NULL, 0, 2, motor_off_callback },
 709         { NULL, NULL, 0, 3, motor_off_callback },
 710         { NULL, NULL, 0, 4, motor_off_callback },
 711         { NULL, NULL, 0, 5, motor_off_callback },
 712         { NULL, NULL, 0, 6, motor_off_callback },
 713         { NULL, NULL, 0, 7, motor_off_callback }
 714 };
 715 
 716 /* schedules motor off */
 717 static void floppy_off(unsigned int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 718 {
 719         unsigned long volatile delta;
 720         register int fdc=FDC(drive);
 721 
 722         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 723                 return;
 724 
 725         del_timer(motor_off_timer+drive);
 726 
 727         /* make spindle stop in a position which minimizes spinup time
 728          * next time */
 729         if (UDP->rps ){
 730                 delta = jiffies - UDRS->first_read_date + HZ -
 731                         UDP->spindown_offset;
 732                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 733                 motor_off_timer[drive].expires = UDP->spindown - delta;
 734         }
 735         add_timer(motor_off_timer+drive);
 736 }
 737 
 738 /*
 739  * cycle through all N_DRIVE floppy drives, for disk change testing.
 740  * stopping at current drive. This is done before any long operation, to
 741  * be sure to have up to date disk change information.
 742  */
 743 static void scandrives(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 744 {
 745         int i, drive, saved_drive;
 746         
 747         if (DP->select_delay)
 748                 return;
 749 
 750         saved_drive = current_drive;
 751         for(i=0; i< N_DRIVE; i++){
 752                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 753                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 754                         continue; /* skip closed drives */
 755                 set_fdc(drive);
 756                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 757                       (0x10 << UNIT(drive))))
 758                         /* switch the motor off again, if it was off to
 759                          * begin with */
 760                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 761         }
 762         set_fdc(saved_drive);
 763 }
 764 
 765 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 766 
 767 /* this function makes sure that the disk stays in the drive during the
 768  * transfer */
 769 static void fd_watchdog(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 770 {
 771 #ifdef DCL_DEBUG
 772         if (DP->flags & FD_DEBUG){
 773                 DPRINT("calling disk change from watchdog\n");
 774         }
 775 #endif
 776 
 777         if ( disk_change(current_drive) ){
 778                 DPRINT("disk removed during i/o\n");
 779                 floppy_shutdown();
 780         } else {                
 781                 del_timer(&fd_timer);
 782                 fd_timer.function = (timeout_fn) fd_watchdog;
 783                 fd_timer.expires = 10;
 784                 add_timer(&fd_timer);
 785         }
 786 }
 787 
 788 static void main_command_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 789 {
 790         del_timer(&fd_timer);
 791         cont->interrupt();
 792 }
 793 
 794 /* waits for a delay (spinup or select) to pass */
 795 static int wait_for_completion(int delay, timeout_fn function)
     /* [previous][next][first][last][top][bottom][index][help] */
 796 {
 797         if ( FDCS->reset ){
 798                 reset_fdc(); /* do the reset during sleep to win time
 799                               * if we don't need to sleep, it's a good
 800                               * occasion anyways */
 801                 return 1;
 802         }
 803 
 804         if ( jiffies < delay ){
 805                 del_timer(&fd_timer);
 806                 fd_timer.function = function;
 807                 fd_timer.expires = delay  - jiffies;
 808                 add_timer(&fd_timer);
 809                 return 1;
 810         }
 811         return 0;
 812 }
 813 
 814 static int hlt_disabled=0;
 815 static void floppy_disable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 816 {
 817         unsigned long flags;
 818         save_flags(flags);
 819         cli();
 820         if(!hlt_disabled){
 821                 hlt_disabled=1;
 822 #ifdef HAVE_DISABLE_HLT
 823                 disable_hlt();
 824 #endif
 825         }
 826         restore_flags(flags);
 827 }
 828 
 829 static void floppy_enable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 830 {
 831         unsigned long flags;
 832         save_flags(flags);
 833         cli();
 834         if(hlt_disabled){
 835                 hlt_disabled=0;
 836 #ifdef HAVE_DISABLE_HLT
 837                 enable_hlt();
 838 #endif
 839         }
 840         restore_flags(flags);
 841 }
 842                 
 843 
 844 static void setup_DMA(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 845 {
 846 #ifdef CONFIG_FLOPPY_SANITY
 847         if (raw_cmd.length == 0){
 848                 int i;
 849 
 850                 printk("zero dma transfer size:");
 851                 for(i=0; i< raw_cmd.cmd_count; i++)
 852                         printk("%x,", raw_cmd.cmd[i]);
 853                 printk("\n");
 854                 cont->done(0);
 855                 FDCS->reset = 1;
 856                 return;
 857         }
 858         if ((!CURRENT ||
 859              CURRENT->buffer != current_addr ||
 860              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 861             (current_addr < floppy_track_buffer ||
 862              current_addr + raw_cmd.length >
 863              floppy_track_buffer + 1024 * max_buffer_sectors)){
 864                 printk("bad address. start=%p lg=%lx tb=%p\n",
 865                        current_addr, raw_cmd.length, floppy_track_buffer);
 866                 if ( CURRENT ){
 867                         printk("buffer=%p nr=%lx cnr=%lx\n",
 868                                CURRENT->buffer, CURRENT->nr_sectors,
 869                                CURRENT->current_nr_sectors);
 870                 }
 871                 cont->done(0);
 872                 FDCS->reset=1;
 873                 return;
 874         }
 875         if ((long) current_addr % 512 ){
 876                 printk("non aligned address: %p\n", current_addr );
 877                 cont->done(0);
 878                 FDCS->reset=1;
 879                 return;
 880         }
 881         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 882             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 883                 printk("DMA crossing 64-K boundary %p-%p\n",
 884                        current_addr, current_addr + raw_cmd.length);
 885                 cont->done(0);
 886                 FDCS->reset=1;
 887                 return;
 888         }
 889 
 890 #endif
 891         cli();
 892         disable_dma(FLOPPY_DMA);
 893         clear_dma_ff(FLOPPY_DMA);
 894         set_dma_mode(FLOPPY_DMA,
 895                      (raw_cmd.flags & FD_RAW_READ)?
 896                      DMA_MODE_READ : DMA_MODE_WRITE);
 897         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 898         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 899         enable_dma(FLOPPY_DMA);
 900         sti();
 901         floppy_disable_hlt();
 902 }
 903 
 904 /* sends a command byte to the fdc */
 905 static int output_byte(char byte)
     /* [previous][next][first][last][top][bottom][index][help] */
 906 {
 907         int counter;
 908         unsigned char status;
 909 
 910         if (FDCS->reset)
 911                 return -1;
 912         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 913                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 914                 if (!(status & STATUS_READY))
 915                         continue;
 916                 if (status == STATUS_READY){
 917                         outb_p(byte,FD_DATA);
 918                         return 0;
 919                 } else
 920                         break;
 921         }
 922         FDCS->reset = 1;
 923         if ( !initialising )
 924                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
 925                         byte, status);
 926         return -1;
 927 }
 928 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 929 
 930 /* gets the response from the fdc */
 931 static int result(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 932 {
 933         int i = 0, counter, status;
 934 
 935         if (FDCS->reset)
 936                 return -1;
 937         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 938                 status = inb_p(FD_STATUS)&
 939                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 940                 if (!(status & STATUS_READY))
 941                         continue;
 942                 if (status == STATUS_READY)
 943                         return i;
 944                 if (status & STATUS_DMA )
 945                         break;
 946                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 947                         if (i >= MAX_REPLIES) {
 948                                 DPRINT("floppy_stat reply overrun\n");
 949                                 break;
 950                         }
 951                         reply_buffer[i++] = inb_p(FD_DATA);
 952                 }
 953         }
 954         FDCS->reset = 1;
 955         if ( !initialising )
 956                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
 957                         status, fdc, i);
 958         return -1;
 959 }
 960 
 961 /* Set perpendicular mode as required, based on data rate, if supported.
 962  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 963  */
 964 static inline void perpendicular_mode(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 965 {
 966         unsigned char perp_mode;
 967 
 968         if (!floppy)
 969                 return;
 970         if (floppy->rate & 0x40){
 971                 switch(raw_cmd.rate){
 972                 case 0:
 973                         perp_mode=2;
 974                         break;
 975                 case 3:
 976                         perp_mode=3;
 977                         break;
 978                 default:
 979                         DPRINT("Invalid data rate for perpendicular mode!\n");
 980                         cont->done(0);
 981                         FDCS->reset = 1; /* convenient way to return to
 982                                           * redo without to much hassle (deep
 983                                           * stack et al. */
 984                         return;
 985                 }
 986         } else
 987                 perp_mode = 0;
 988                         
 989         if ( FDCS->perp_mode == perp_mode )
 990                 return;
 991         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 992                 output_byte(FD_PERPENDICULAR);
 993                 output_byte(perp_mode);
 994                 FDCS->perp_mode = perp_mode;
 995         } else if (perp_mode) {
 996                 DPRINT("perpendicular mode not supported by this FDC.\n");
 997         }
 998 } /* perpendicular_mode */
 999 
1000 #define NOMINAL_DTR 500
1001 
1002 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1003  * head load time, and DMA disable flag to values needed by floppy.
1004  *
1005  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1006  * to account for the data rate-based scaling done by the 82072 and 82077
1007  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1008  * 8272a).
1009  *
1010  * Note that changing the data transfer rate has a (probably deleterious)
1011  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1012  * fdc_specify is called again after each data transfer rate
1013  * change.
1014  *
1015  * srt: 1000 to 16000 in microseconds
1016  * hut: 16 to 240 milliseconds
1017  * hlt: 2 to 254 milliseconds
1018  *
1019  * These values are rounded up to the next highest available delay time.
1020  */
1021 static void fdc_specify(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1022 {
1023         unsigned char spec1, spec2;
1024         int srt, hlt, hut;
1025         unsigned long dtr = NOMINAL_DTR;
1026         unsigned long scale_dtr = NOMINAL_DTR;
1027         int hlt_max_code = 0x7f;
1028         int hut_max_code = 0xf;
1029 
1030         if (FDCS->need_configure && FDCS->has_fifo) {
1031                 if ( FDCS->reset )
1032                         return;
1033                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1034                 /* TODO: lock this in via LOCK during initialization */
1035                 output_byte(FD_CONFIGURE);
1036                 output_byte(0);
1037                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1038                 output_byte(0);         /* precompensation from track 0 upwards */
1039                 if ( FDCS->reset ){
1040                         FDCS->has_fifo=0;
1041                         return;
1042                 }
1043                 FDCS->need_configure = 0;
1044                 /*DPRINT("FIFO enabled\n");*/
1045         }
1046 
1047         switch (raw_cmd.rate & 0x03) {
1048         case 3:
1049                 dtr = 1000;
1050                 break;
1051         case 1:
1052                 dtr = 300;
1053                 break;
1054         case 2:
1055                 dtr = 250;
1056                 break;
1057         }
1058 
1059         if (FDCS->version >= FDC_82072) {
1060                 scale_dtr = dtr;
1061                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1062                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1063         }
1064 
1065         /* Convert step rate from microseconds to milliseconds and 4 bits */
1066         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1067         if (srt > 0xf)
1068                 srt = 0xf;
1069         else if (srt < 0)
1070                 srt = 0;
1071 
1072         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1073         if (hlt < 0x01)
1074                 hlt = 0x01;
1075         else if (hlt > 0x7f)
1076                 hlt = hlt_max_code;
1077 
1078         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1079         if (hut < 0x1)
1080                 hut = 0x1;
1081         else if (hut > 0xf)
1082                 hut = hut_max_code;
1083 
1084         spec1 = (srt << 4) | hut;
1085         spec2 = (hlt << 1);
1086 
1087         /* If these parameters did not change, just return with success */
1088         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1089                 /* Go ahead and set spec1 and spec2 */
1090                 output_byte(FD_SPECIFY);
1091                 output_byte(FDCS->spec1 = spec1);
1092                 output_byte(FDCS->spec2 = spec2);
1093         }
1094 } /* fdc_specify */
1095 
1096 /* Set the FDC's data transfer rate on behalf of the specified drive.
1097  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1098  * of the specify command (i.e. using the fdc_specify function).
1099  */
1100 static int fdc_dtr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1101 {
1102         /* If data rate not already set to desired value, set it. */
1103         if ( raw_cmd.rate == FDCS->dtr)
1104                 return 0;
1105         
1106         /* Set dtr */
1107         outb_p(raw_cmd.rate, FD_DCR);
1108         
1109         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1110          * need a stabilization period of several milliseconds to be
1111          * enforced after data rate changes before R/W operations.
1112          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1113          */
1114         FDCS->dtr = raw_cmd.rate;
1115         return(wait_for_completion(jiffies+2,
1116                                    (timeout_fn) floppy_ready));
1117 } /* fdc_dtr */
1118 
1119 static void tell_sector(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1120 {
1121         printk(": track %d, head %d, sector %d, size %d",
1122                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1123 } /* tell_sector */
1124 
1125 
1126 /*
1127  * Ok, this error interpreting routine is called after a
1128  * DMA read/write has succeeded
1129  * or failed, so we check the results, and copy any buffers.
1130  * hhb: Added better error reporting.
1131  * ak: Made this into a separate routine.
1132  */
1133 static int interpret_errors(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1134 {
1135         char bad;
1136 
1137         if (inr!=7) {
1138                 DPRINT("-- FDC reply error");
1139                 FDCS->reset = 1;
1140                 return 1;
1141         }
1142 
1143         /* check IC to find cause of interrupt */
1144         switch ((ST0 & ST0_INTR)>>6) {
1145                 case 1: /* error occurred during command execution */
1146                         bad = 1;
1147                         if (ST1 & ST1_WP) {
1148                                 DPRINT("Drive is write protected\n");
1149                                 CLEARF(FD_DISK_WRITABLE);
1150                                 cont->done(0);
1151                                 bad = 2;
1152                         } else if (ST1 & ST1_ND) {
1153                                 SETF(FD_NEED_TWADDLE);
1154                         } else if (ST1 & ST1_OR) {
1155                                 if (DP->flags & FTD_MSG )
1156                                         DPRINT("Over/Underrun - retrying\n");
1157                                 bad = 0;
1158                         }else if(*errors >= DP->max_errors.reporting){
1159                                 DPRINT("");
1160                                 if (ST0 & ST0_ECE) {
1161                                         printk("Recalibrate failed!");
1162                                 } else if (ST2 & ST2_CRC) {
1163                                         printk("data CRC error");
1164                                         tell_sector();
1165                                 } else if (ST1 & ST1_CRC) {
1166                                         printk("CRC error");
1167                                         tell_sector();
1168                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1169                                         if (!probing) {
1170                                                 printk("sector not found");
1171                                                 tell_sector();
1172                                         } else
1173                                                 printk("probe failed...");
1174                                 } else if (ST2 & ST2_WC) {      /* seek error */
1175                                         printk("wrong cylinder");
1176                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1177                                         printk("bad cylinder");
1178                                 } else {
1179                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1180                                         tell_sector();
1181                                 }
1182                                 printk("\n");
1183 
1184                         }
1185                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1186                                 /* wrong cylinder => recal */
1187                                 DRS->track = NEED_2_RECAL;
1188                         return bad;
1189                 case 2: /* invalid command given */
1190                         DPRINT("Invalid FDC command given!\n");
1191                         cont->done(0);
1192                         return 2;
1193                 case 3:
1194                         DPRINT("Abnormal termination caused by polling\n");
1195                         cont->error();
1196                         return 2;
1197                 default: /* (0) Normal command termination */
1198                         return 0;
1199         }
1200 }
1201 
1202 /*
1203  * This routine is called when everything should be correctly set up
1204  * for the transfer (ie floppy motor is on, the correct floppy is
1205  * selected, and the head is sitting on the right track).
1206  */
1207 static void setup_rw_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1208 {
1209         int i,ready_date,r, flags,dflags;
1210         timeout_fn function;
1211 
1212         flags = raw_cmd.flags;
1213         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1214                 flags |= FD_RAW_INTR;
1215 
1216         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1217                 ready_date = DRS->spinup_date + DP->spinup;             
1218                 /* If spinup will take a long time, rerun scandrives
1219                  * again just before spinup completion. Beware that
1220                  * after scandrives, we must again wait for selection.
1221                  */
1222                 if ( ready_date > jiffies + DP->select_delay){
1223                         ready_date -= DP->select_delay;
1224                         function = (timeout_fn) floppy_start;
1225                 } else
1226                         function = (timeout_fn) setup_rw_floppy;
1227 
1228                 /* wait until the floppy is spinning fast enough */
1229                 if (wait_for_completion(ready_date,function))
1230                         return;
1231         }
1232         dflags = DRS->flags;
1233 
1234         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1235                 setup_DMA();
1236         
1237         if ( flags & FD_RAW_INTR )
1238                 SET_INTR(main_command_interrupt);
1239 
1240         r=0;
1241         for(i=0; i< raw_cmd.cmd_count; i++)
1242                 r|=output_byte( raw_cmd.cmd[i] );
1243 
1244 #ifdef DEBUGT
1245         debugt("rw_command: ");
1246 #endif
1247         if ( r ){
1248                 reset_fdc();
1249                 return;
1250         }
1251 
1252         if ( ! ( flags & FD_RAW_INTR )){
1253                 inr = result();
1254                 cont->interrupt();
1255         } else if ( flags & FD_RAW_NEED_DISK )
1256                 fd_watchdog();
1257 }
1258 
1259 static int blind_seek;
1260 
1261 /*
1262  * This is the routine called after every seek (or recalibrate) interrupt
1263  * from the floppy controller.
1264  */
1265 static void seek_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1266 {
1267 #ifdef DEBUGT
1268         debugt("seek interrupt:");
1269 #endif
1270         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1271                 DPRINT("seek failed\n");
1272                 DRS->track = NEED_2_RECAL;
1273                 cont->error();
1274                 cont->redo();
1275                 return;
1276         }
1277         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1278 #ifdef DCL_DEBUG
1279                 if (DP->flags & FD_DEBUG){
1280                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1281                         DPRINT1("jiffies=%ld\n", jiffies);
1282                 }
1283 #endif
1284                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1285                 DRS->select_date = jiffies;
1286         }
1287         DRS->track = ST1;
1288         floppy_ready();
1289 }
1290 
1291 static void check_wp(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1292 {
1293         if (TESTF(FD_VERIFY)) {
1294                 /* check write protection */
1295                 output_byte( FD_GETSTATUS );
1296                 output_byte( UNIT(current_drive) );
1297                 if ( result() != 1 ){
1298                         FDCS->reset = 1;
1299                         return;
1300                 }
1301                 CLEARF(FD_VERIFY);
1302                 CLEARF(FD_NEED_TWADDLE);
1303 #ifdef DCL_DEBUG
1304                 if (DP->flags & FD_DEBUG){
1305                         DPRINT("checking whether disk is write protected\n");
1306                         DPRINT1("wp=%x\n",ST3 & 0x40);
1307                 }
1308 #endif
1309                 if (!( ST3  & 0x40))
1310                         SETF(FD_DISK_WRITABLE);
1311                 else
1312                         CLEARF(FD_DISK_WRITABLE);
1313         }
1314 }
1315 
1316 static void seek_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1317 {
1318         int track;
1319 
1320         blind_seek=0;
1321 
1322 #ifdef DCL_DEBUG
1323         if (DP->flags & FD_DEBUG){
1324                 DPRINT("calling disk change from seek\n");
1325         }
1326 #endif
1327 
1328         if (!TESTF(FD_DISK_NEWCHANGE) &&
1329             disk_change(current_drive) &&
1330             (raw_cmd.flags & FD_RAW_NEED_DISK)){
1331                 /* the media changed flag should be cleared after the seek.
1332                  * If it isn't, this means that there is really no disk in
1333                  * the drive.
1334                  */
1335                 SETF(FD_DISK_CHANGED);
1336                 cont->done(0);
1337                 cont->redo();
1338                 return;
1339         }
1340         if ( DRS->track <= NEED_1_RECAL ){
1341                 recalibrate_floppy();
1342                 return;
1343         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1344                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1345                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1346                 /* we seek to clear the media-changed condition. Does anybody
1347                  * know a more elegant way, which works on all drives? */
1348                 if ( raw_cmd.track )
1349                         track = raw_cmd.track - 1;
1350                 else {
1351                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1352                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1353                                 blind_seek = 1;
1354                                 raw_cmd.flags |= FD_RAW_NEED_SEEK;
1355                         }
1356                         track = 1;
1357                 }
1358         } else {
1359                 check_wp();
1360                 if (raw_cmd.track != DRS->track &&
1361                     (raw_cmd.flags & FD_RAW_NEED_SEEK))
1362                         track = raw_cmd.track;
1363                 else {
1364                         setup_rw_floppy();
1365                         return;
1366                 }
1367         }
1368 
1369         SET_INTR(seek_interrupt);
1370         output_byte(FD_SEEK);
1371         output_byte(UNIT(current_drive));
1372         LAST_OUT(track);
1373 #ifdef DEBUGT
1374         debugt("seek command:");
1375 #endif
1376 }
1377 
1378 static void recal_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1379 {
1380 #ifdef DEBUGT
1381         debugt("recal interrupt:");
1382 #endif
1383         if (inr !=2 )
1384                 FDCS->reset = 1;
1385         else if (ST0 & ST0_ECE) {
1386                 switch(DRS->track){
1387                 case NEED_1_RECAL:
1388 #ifdef DEBUGT
1389                         debugt("recal interrupt need 1 recal:");
1390 #endif
1391                         /* after a second recalibrate, we still haven't
1392                          * reached track 0. Probably no drive. Raise an
1393                          * error, as failing immediately might upset 
1394                          * computers possessed by the Devil :-) */
1395                         cont->error();
1396                         cont->redo();
1397                         return;
1398                 case NEED_2_RECAL:
1399 #ifdef DEBUGT
1400                         debugt("recal interrupt need 2 recal:");
1401 #endif
1402                         /* If we already did a recalibrate, and we are not at
1403                          * track 0, this means we have moved. (The only way
1404                          * not to move at recalibration is to be already at
1405                          * track 0.) Clear the new change flag
1406                          */
1407 #ifdef DCL_DEBUG
1408                         if (DP->flags & FD_DEBUG){
1409                                 DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1410                         }
1411 #endif
1412 
1413                         CLEARF(FD_DISK_NEWCHANGE);
1414                         DRS->select_date = jiffies;
1415                         /* fall through */
1416                 default:
1417 #ifdef DEBUGT
1418                         debugt("recal interrupt default:");
1419 #endif
1420                         /* Recalibrate moves the head by at most 80 steps. If
1421                          * after one recalibrate we don't have reached track
1422                          * 0, this might mean that we started beyond track 80.
1423                          * Try again.
1424                          */
1425                         DRS->track = NEED_1_RECAL;
1426                         break;
1427                 }
1428         } else
1429                 DRS->track = ST1;
1430         floppy_ready();
1431 }
1432 
1433 /*
1434  * Unexpected interrupt - Print as much debugging info as we can...
1435  * All bets are off...
1436  */
1437 static void unexpected_floppy_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1438 {
1439         int i;
1440         if ( initialising )
1441                 return;
1442         if(print_unex){
1443                 DPRINT("unexpected interrupt\n");
1444                 if ( inr >= 0 )
1445                         for(i=0; i<inr; i++)
1446                                 printk("%d %x\n", i, reply_buffer[i] );
1447         }
1448         while(1){
1449                 output_byte(FD_SENSEI);
1450                 inr=result();
1451                 if ( inr != 2 )
1452                         break;
1453                 if(print_unex){
1454                         printk("sensei\n");
1455                         for(i=0; i<inr; i++)
1456                                 printk("%d %x\n", i, reply_buffer[i] );
1457                 }
1458         }
1459         FDCS->reset = 1;
1460 }
1461 
1462 struct tq_struct floppy_tq = 
1463 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1464 
1465 /* interrupt handler */
1466 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
1467 {
1468         void (*handler)(void) = DEVICE_INTR;
1469 
1470         floppy_enable_hlt();
1471         CLEAR_INTR;
1472         if ( fdc >= N_FDC || FDCS->address == -1){
1473                 /* we don't even know which FDC is the culprit */
1474                 printk("DOR0=%x\n", fdc_state[0].dor);
1475                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1476                 printk("handler=%p\n", handler);
1477                 return;
1478         }
1479         inr = result();
1480         if (!handler){
1481                 unexpected_floppy_interrupt();
1482                 return;
1483         }
1484         if ( inr == 0 ){
1485                 do {
1486                         output_byte(FD_SENSEI);
1487                         inr = result();
1488                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1489         }
1490         floppy_tq.routine = (void *)(void *) handler;
1491         queue_task_irq(&floppy_tq, &tq_timer);
1492 }
1493 
1494 static void recalibrate_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1495 {
1496 #ifdef DEBUGT
1497         debugt("recalibrate floppy:");
1498 #endif
1499         SET_INTR(recal_interrupt);
1500         output_byte(FD_RECALIBRATE);
1501         LAST_OUT(UNIT(current_drive));
1502 }
1503 
1504 /*
1505  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1506  */
1507 static void reset_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1508 {
1509 #ifdef DEBUGT
1510         debugt("reset interrupt:");
1511 #endif
1512         fdc_specify();          /* reprogram fdc */
1513         result();               /* get the status ready for set_fdc */
1514         if ( FDCS->reset )
1515                 cont->error(); /* a reset just after a reset. BAD! */
1516         cont->redo();
1517 }
1518 
1519 /*
1520  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1521  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1522  */
1523 static void reset_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1524 {
1525         SET_INTR(reset_interrupt);
1526         FDCS->reset = 0;
1527         reset_fdc_info(0);
1528         if ( FDCS->version >= FDC_82077 )
1529                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1530         else {
1531                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1532                 udelay(FD_RESET_DELAY);
1533                 outb(FDCS->dor, FD_DOR);
1534         }
1535 }
1536 
1537 static void empty(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1538 {
1539 }
1540 
1541 void show_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1542 {
1543         int i;
1544 
1545         printk("\n");
1546         printk("floppy driver state\n");
1547         printk("-------------------\n");
1548         for(i=0; i<N_FDC; i++){
1549                 if(FDCS->address != -1){
1550                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1551                         outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1552                         udelay(1000); /* maybe we'll catch an interrupt... */
1553                 }
1554         }
1555         printk("status=%x\n", inb_p(FD_STATUS));
1556         printk("fdc_busy=%d\n", fdc_busy);
1557         if( DEVICE_INTR)
1558                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1559         if(floppy_tq.sync)
1560                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1561         if(fd_timer.prev)
1562                 printk("fd_timer.function=%p\n", fd_timer.function);
1563         if(fd_timeout.prev){
1564                 printk("timer_table=%p\n",fd_timeout.function);
1565                 printk("expires=%ld\n",fd_timeout.expires);
1566                 printk("now=%ld\n",jiffies);
1567         }
1568         printk("cont=%p\n", cont);
1569         printk("CURRENT=%p\n", CURRENT);
1570         printk("command_status=%d\n", command_status);
1571         printk("\n");
1572 }
1573 
1574 static void floppy_shutdown(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1575 {
1576         CLEAR_INTR;
1577         floppy_tq.routine = (void *)(void *) empty;
1578         del_timer( &fd_timer);
1579 
1580         floppy_enable_hlt();
1581         disable_dma(FLOPPY_DMA);
1582         /* avoid dma going to a random drive after shutdown */
1583 
1584         if(!initialising)
1585                 DPRINT("floppy timeout\n");
1586         FDCS->reset = 1;
1587         cont->done(0);
1588         cont->redo(); /* this will recall reset when needed */
1589 }
1590 /*typedef void (*timeout_fn)(unsigned long);*/
1591 
1592 /* start motor, check media-changed condition and write protection */
1593 static int start_motor( void (*function)(void)  )
     /* [previous][next][first][last][top][bottom][index][help] */
1594 {
1595         int mask, data;
1596 
1597         mask = 0xfc;
1598         data = UNIT(current_drive);
1599         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1600                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1601                         set_debugt();
1602                         /* no read since this drive is running */
1603                         DRS->first_read_date = 0;
1604                         /* note motor start time if motor is not yet running */
1605                         DRS->spinup_date = jiffies;
1606                         data |= (0x10 << UNIT(current_drive));
1607                 }
1608         } else
1609                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1610                         mask &= ~(0x10 << UNIT(current_drive));
1611 
1612         /* starts motor and selects floppy */
1613         del_timer(motor_off_timer + current_drive);
1614         set_dor( fdc, mask, data);
1615 
1616         /* wait_for_completion also schedules reset if needed. */
1617         return(wait_for_completion(DRS->select_date+DP->select_delay,
1618                                    (timeout_fn) function));
1619 }
1620 
1621 static void floppy_ready(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1622 {
1623         CHECK_RESET;
1624         if(start_motor(floppy_ready)) return;
1625         if(fdc_dtr()) return;
1626 
1627 #ifdef DCL_DEBUG
1628         if (DP->flags & FD_DEBUG){
1629                 DPRINT("calling disk change from floppy_ready\n");
1630         }
1631 #endif
1632 
1633         if(!(raw_cmd.flags & FD_RAW_NO_MOTOR) &&
1634            disk_change(current_drive) &&
1635            !DP->select_delay)
1636                 twaddle(); /* this clears the dcl on certain drive/controller
1637                             * combinations */
1638 
1639         if ( raw_cmd.flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1640                 perpendicular_mode();
1641                 fdc_specify(); /* must be done here because of hut, hlt ... */
1642                 seek_floppy();
1643         } else
1644                 setup_rw_floppy();
1645 }
1646 
1647 static void floppy_start(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1648 {
1649         del_timer(&fd_timeout);
1650         fd_timeout.expires = DP->timeout;
1651         add_timer(&fd_timeout);
1652 
1653         scandrives();
1654 #ifdef DCL_DEBUG
1655                 if (DP->flags & FD_DEBUG){
1656                         DPRINT("setting NEWCHANGE in floppy_start\n");
1657                 }
1658 #endif
1659         SETF(FD_DISK_NEWCHANGE);
1660         floppy_ready();
1661 }
1662 
1663 /*
1664  * ========================================================================
1665  * here ends the bottom half. Exported routines are:
1666   * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1667  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1668  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1669  * and set_dor.
1670  * ========================================================================
1671  */
1672 /*
1673  * General purpose continuations.
1674  * ==============================
1675  */
1676 
1677 static void do_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1678 {
1679         del_timer(&fd_timeout);
1680         cont = 0;
1681         command_status += 2;
1682         wake_up(&command_done);
1683 }
1684 
1685 static struct cont_t wakeup_cont={
1686         empty,
1687         do_wakeup,
1688         empty,
1689         (done_f)empty
1690 };
1691 
1692 static int wait_til_done( void (*handler)(void ), int interruptible )
     /* [previous][next][first][last][top][bottom][index][help] */
1693 {
1694         int ret;
1695 
1696         floppy_tq.routine = (void *)(void *) handler;
1697         queue_task(&floppy_tq, &tq_timer);
1698 
1699         cli();
1700         while(command_status < 2 && NO_SIGNAL)
1701                 if (current->pid)
1702                         interruptible_sleep_on(&command_done);
1703                 else {
1704                         sti();
1705                         run_task_queue(&tq_timer);
1706                         cli();
1707                 }
1708         if(command_status < 2){
1709                 sti();
1710                 floppy_shutdown();
1711                 process_fd_request();
1712                 return -EINTR;
1713         }
1714         sti();
1715 
1716         if ( FDCS->reset )
1717                 command_status = FD_COMMAND_ERROR;
1718         if ( command_status == FD_COMMAND_OKAY )
1719                 ret=0;
1720         else
1721                 ret=-EIO;
1722         command_status = FD_COMMAND_NONE;
1723         return ret;
1724 }
1725 
1726 static void generic_done(int result)
     /* [previous][next][first][last][top][bottom][index][help] */
1727 {
1728         command_status = result;
1729         cont = &wakeup_cont;
1730 }
1731 
1732 static void generic_success(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1733 {
1734         generic_done(1);
1735 }
1736 
1737 static void generic_failure(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1738 {
1739         generic_done(0);
1740 }
1741 
1742 static void success_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1743 {
1744         generic_success();
1745         do_wakeup();
1746 }
1747 
1748 static void failure_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1749 {
1750         generic_failure();
1751         do_wakeup();
1752 }
1753 
1754 /*
1755  * formatting and rw support.
1756  * ==========================
1757  */
1758 
1759 static int next_valid_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1760 {
1761         int probed_format;
1762 
1763         probed_format = DRS->probed_format;
1764         while(1){
1765                 if ( probed_format >= 8 ||
1766                     ! DP->autodetect[probed_format] ){
1767                         DRS->probed_format = 0;
1768                         return 1;
1769                 }
1770                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1771                         DRS->probed_format = probed_format;
1772                         return 0;
1773                 }
1774                 probed_format++;
1775         }
1776 }
1777 
1778 static void bad_flp_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1779 {
1780         if ( probing ){
1781                 DRS->probed_format++;
1782                 if ( !next_valid_format())
1783                         return;
1784         }
1785         (*errors)++;
1786         if (*errors > DRWE->badness)
1787                 DRWE->badness = *errors;
1788         if (*errors > DP->max_errors.abort)
1789                 cont->done(0);
1790         if (*errors > DP->max_errors.reset)
1791                 FDCS->reset = 1;
1792         else if (*errors > DP->max_errors.recal)
1793                 DRS->track = NEED_2_RECAL;
1794 }
1795 
1796 static void set_floppy(int device)
     /* [previous][next][first][last][top][bottom][index][help] */
1797 {
1798         if (TYPE(device))
1799                 floppy = TYPE(device) + floppy_type;
1800         else
1801                 floppy = current_type[ DRIVE(device) ];
1802 }
1803 
1804 /*
1805  * formatting and support.
1806  * =======================
1807  */
1808 static void format_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1809 {
1810         switch (interpret_errors()){
1811         case 1:
1812                 cont->error();
1813         case 2:
1814                 break;
1815         case 0:
1816                 cont->done(1);
1817         }
1818         cont->redo();
1819 }
1820 
1821 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
1822 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
1823 #define CT(x) ( (x) | 0x40 )
1824 static void setup_format_params(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1825 {
1826         struct fparm {
1827                 unsigned char track,head,sect,size;
1828         } *here = (struct fparm *)floppy_track_buffer;
1829         int il,n;
1830         int count,head_shift,track_shift;
1831 
1832         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1833                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1834         raw_cmd.rate = floppy->rate & 0x3;
1835         raw_cmd.cmd_count = NR_F;
1836         COMMAND = FM_MODE(floppy,FD_FORMAT);
1837         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1838         F_SIZECODE = FD_SIZECODE(floppy);
1839         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1840         F_GAP = floppy->fmt_gap;
1841         F_FILL = FD_FILL_BYTE;
1842 
1843         current_addr = floppy_track_buffer;
1844         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1845 
1846         /* allow for about 30ms for data transport per track */
1847         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1848 
1849         /* a ``cylinder'' is two tracks plus a little stepping time */
1850         track_shift = 2 * head_shift + 1;
1851 
1852         /* position of logical sector 1 on this track */
1853         n = (track_shift * format_req.track + head_shift * format_req.head )
1854                 % F_SECT_PER_TRACK;
1855 
1856         /* determine interleave */
1857         il = 1;
1858         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
1859                 il++;
1860 
1861         /* initialize field */
1862         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1863                 here[count].track = format_req.track;
1864                 here[count].head = format_req.head;
1865                 here[count].sect = 0;
1866                 here[count].size = F_SIZECODE;
1867         }
1868         /* place logical sectors */
1869         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1870                 here[n].sect = count;
1871                 n = (n+il) % F_SECT_PER_TRACK;
1872                 if (here[n].sect) { /* sector busy, find next free sector */
1873                         ++n;
1874                         if (n>= F_SECT_PER_TRACK) {
1875                                 n-=F_SECT_PER_TRACK;
1876                                 while (here[n].sect) ++n;
1877                         }
1878                 }
1879         }
1880 }
1881 
1882 static void redo_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1883 {
1884         raw_cmd.track = format_req.track << floppy->stretch;
1885         buffer_track = -1;
1886         setup_format_params();
1887         floppy_start();
1888 #ifdef DEBUGT
1889         debugt("queue format request");
1890 #endif
1891 }
1892 
1893 static struct cont_t format_cont={
1894         format_interrupt,
1895         redo_format,
1896         bad_flp_intr,
1897         generic_done };
1898 
1899 static int do_format(int device, struct format_descr *tmp_format_req)
     /* [previous][next][first][last][top][bottom][index][help] */
1900 {
1901         int ret;
1902         int drive=DRIVE(device);
1903 
1904         LOCK_FDC(drive,1);
1905         set_floppy(device);
1906         if (!floppy ||
1907             floppy->track > DP->tracks ||
1908             tmp_format_req->track >= floppy->track ||
1909             tmp_format_req->head >= floppy->head ||
1910             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
1911             !floppy->fmt_gap) {
1912                 process_fd_request();
1913                 return -EINVAL;
1914         }
1915         format_req = *tmp_format_req;
1916         format_errors = 0;
1917         cont = &format_cont;
1918         errors = &format_errors;
1919         IWAIT(redo_format);
1920         process_fd_request();
1921         return ret;
1922 }
1923 
1924 /*
1925  * Buffer read/write and support
1926  * =============================
1927  */
1928 
1929 /* new request_done. Can handle physical sectors which are smaller than a
1930  * logical buffer */
1931 static void request_done(int uptodate)
     /* [previous][next][first][last][top][bottom][index][help] */
1932 {
1933         int block;
1934 
1935         probing = 0;
1936         del_timer(&fd_timeout);
1937 
1938         if (!CURRENT){
1939                 DPRINT("request list destroyed in floppy request done\n");
1940                 return;
1941         }
1942         if (uptodate){
1943                 /* maintain values for invalidation on geometry
1944                    change */
1945                 block = current_count_sectors + CURRENT->sector;
1946                 if (block > DRS->maxblock)
1947                         DRS->maxblock=block;
1948                 if ( block > floppy->sect)
1949                         DRS->maxtrack = 1;
1950 
1951                 /* unlock chained buffers */
1952                 while (current_count_sectors && CURRENT &&
1953                        current_count_sectors >= CURRENT->current_nr_sectors ){
1954                         current_count_sectors -= CURRENT->current_nr_sectors;
1955                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1956                         CURRENT->sector += CURRENT->current_nr_sectors;
1957                         end_request(1);
1958                 }
1959                 if ( current_count_sectors && CURRENT){
1960                         /* "unlock" last subsector */
1961                         CURRENT->buffer += current_count_sectors <<9;
1962                         CURRENT->current_nr_sectors -= current_count_sectors;
1963                         CURRENT->nr_sectors -= current_count_sectors;
1964                         CURRENT->sector += current_count_sectors;
1965                         return;
1966                 }
1967 
1968                 if ( current_count_sectors && ! CURRENT )
1969                         DPRINT("request list destroyed in floppy request done\n");
1970 
1971         } else {
1972                 if(CURRENT->cmd == WRITE) {
1973                         /* record write error information */
1974                         DRWE->write_errors++;
1975                         if(DRWE->write_errors == 1) {
1976                                 DRWE->first_error_sector = CURRENT->sector;
1977                                 DRWE->first_error_generation = DRS->generation;
1978                         }
1979                         DRWE->last_error_sector = CURRENT->sector;
1980                         DRWE->last_error_generation = DRS->generation;
1981                 }
1982                 end_request(0);
1983         }
1984 }
1985 
1986 /* Interrupt handler evaluating the result of the r/w operation */
1987 static void rw_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1988 {
1989         int nr_sectors, ssize;
1990 
1991         if ( ! DRS->first_read_date )
1992                 DRS->first_read_date = jiffies;
1993 
1994         nr_sectors = 0;
1995         CODE2SIZE;
1996         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1997                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
1998                         (sector_t % floppy->sect) % ssize;
1999 
2000 #ifdef CONFIG_FLOPPY_SANITY
2001         if ( nr_sectors > current_count_sectors + ssize -
2002             (current_count_sectors + sector_t) % ssize +
2003             sector_t % ssize){
2004                 DPRINT2("long rw: %x instead of %lx\n",
2005                         nr_sectors, current_count_sectors);
2006                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2007                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2008                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2009                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2010                        sector_t, ssize);
2011         }
2012 #endif
2013         if ( nr_sectors < 0 )
2014                 nr_sectors = 0;
2015         if ( nr_sectors < current_count_sectors )
2016                 current_count_sectors = nr_sectors;
2017 
2018         switch (interpret_errors()){
2019         case 2:
2020                 cont->redo();
2021                 return;
2022         case 1:
2023                 if (  !current_count_sectors){
2024                         cont->error();
2025                         cont->redo();
2026                         return;
2027                 }
2028                 break;
2029         case 0:
2030                 if (  !current_count_sectors){
2031                         cont->redo();
2032                         return;
2033                 }
2034                 current_type[current_drive] = floppy;
2035                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
2036                         floppy->size >> 1;
2037                 break;
2038         }
2039 
2040         if (probing) {
2041                 if (DP->flags & FTD_MSG)
2042                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2043                                 floppy->name,current_drive);
2044                 current_type[current_drive] = floppy;
2045                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
2046                         floppy->size >> 1;
2047                 probing = 0;
2048         }
2049 
2050         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
2051                 /* transfer directly from buffer */
2052                 cont->done(1);
2053         } else if ( CT(COMMAND) == FD_READ){
2054                 buffer_track = raw_cmd.track;
2055                 buffer_drive = current_drive;
2056                 if ( nr_sectors + sector_t > buffer_max )
2057                         buffer_max = nr_sectors + sector_t;
2058         }
2059         cont->redo();
2060 }
2061 
2062 /* Compute maximal contiguous buffer size. */
2063 static int buffer_chain_size(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2064 {
2065         struct buffer_head *bh;
2066         int size;
2067         char *base;
2068 
2069         base = CURRENT->buffer;
2070         size = CURRENT->current_nr_sectors << 9;
2071         bh = CURRENT->bh;
2072 
2073         if (bh){
2074                 bh = bh->b_reqnext;
2075                 while ( bh && bh->b_data == base + size ){
2076                         size += bh->b_size;
2077                         bh = bh->b_reqnext;
2078                 }
2079         }
2080         return size >> 9;
2081 }
2082 
2083 /* Compute the maximal transfer size */
2084 static int transfer_size(int ssize, int max_sector, int max_size)
     /* [previous][next][first][last][top][bottom][index][help] */
2085 {
2086         if ( max_sector > sector_t + max_size)
2087                 max_sector = sector_t + max_size;
2088 
2089         /* alignment */
2090         max_sector -= (max_sector % floppy->sect ) % ssize;
2091 
2092         /* transfer size, beginning not aligned */
2093         current_count_sectors = max_sector - sector_t ;
2094 
2095         return max_sector;
2096 }
2097 
2098 /*
2099  * Move data from/to the track buffer to/from the buffer cache.
2100  */
2101 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /* [previous][next][first][last][top][bottom][index][help] */
2102 {
2103         int remaining; /* number of transferred 512-byte sectors */
2104         struct buffer_head *bh;
2105         char *buffer, *dma_buffer;
2106         int size;
2107 
2108         if ( max_sector > max_sector_2 )
2109                 max_sector = max_sector_2;
2110 
2111         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2112 
2113         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2114             buffer_max > sector_t + CURRENT->nr_sectors){
2115                 current_count_sectors = buffer_max - sector_t;
2116                 if ( current_count_sectors > CURRENT->nr_sectors )
2117                         current_count_sectors = CURRENT->nr_sectors;
2118         }
2119         remaining = current_count_sectors << 9;
2120 #ifdef CONFIG_FLOPPY_SANITY
2121         if ((remaining >> 9) > CURRENT->nr_sectors  && 
2122             CT(COMMAND) == FD_WRITE ){
2123                 DPRINT("in copy buffer\n");
2124                 printk("current_count_sectors=%ld\n", current_count_sectors);
2125                 printk("remaining=%d\n", remaining >> 9);
2126                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2127                 printk("CURRENT->current_nr_sectors=%ld\n",
2128                        CURRENT->current_nr_sectors);
2129                 printk("max_sector=%d\n", max_sector);
2130                 printk("ssize=%d\n", ssize);
2131         }
2132 #endif
2133 
2134         if ( max_sector > buffer_max )
2135                 buffer_max = max_sector;
2136 
2137         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2138 
2139         bh = CURRENT->bh;
2140         size = CURRENT->current_nr_sectors << 9;
2141         buffer = CURRENT->buffer;
2142 
2143         while ( remaining > 0){
2144                 if ( size > remaining )
2145                         size = remaining;
2146 #ifdef CONFIG_FLOPPY_SANITY
2147                 if (dma_buffer + size >
2148                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2149                     dma_buffer < floppy_track_buffer ){
2150                         DPRINT1("buffer overrun in copy buffer %d\n",
2151                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2152                         printk("sector_t=%d buffer_min=%d\n",
2153                                sector_t, buffer_min);
2154                         printk("current_count_sectors=%ld\n",
2155                                current_count_sectors);
2156                         if ( CT(COMMAND) == FD_READ )
2157                                 printk("read\n");
2158                         if ( CT(COMMAND) == FD_READ )
2159                                 printk("write\n");
2160                         break;
2161                 }
2162                 if ( ((unsigned long)buffer) % 512 )
2163                         DPRINT1("%p buffer not aligned\n", buffer);
2164 #endif
2165                 if ( CT(COMMAND) == FD_READ )
2166                         memcpy( buffer, dma_buffer, size);
2167                 else
2168                         memcpy( dma_buffer, buffer, size);
2169                 remaining -= size;
2170                 if ( !remaining)
2171                         break;
2172 
2173                 dma_buffer += size;
2174                 bh = bh->b_reqnext;
2175 #ifdef CONFIG_FLOPPY_SANITY
2176                 if ( !bh){
2177                         DPRINT("bh=null in copy buffer after copy\n");
2178                         break;
2179                 }
2180 #endif
2181                 size = bh->b_size;
2182                 buffer = bh->b_data;
2183         }
2184 #ifdef CONFIG_FLOPPY_SANITY
2185         if ( remaining ){
2186                 if ( remaining > 0 )
2187                         max_sector -= remaining >> 9;
2188                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2189         }
2190 #endif
2191 }
2192 
2193 /*
2194  * Formulate a read/write request.
2195  * this routine decides where to load the data (directly to buffer, or to
2196  * tmp floppy area), how much data to load (the size of the buffer, the whole
2197  * track, or a single sector)
2198  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2199  * allocation on the fly, it should be done here. No other part should need
2200  * modification.
2201  */
2202 
2203 static int make_raw_rw_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2204 {
2205         int aligned_sector_t;
2206         int max_sector, max_size, tracksize, ssize;
2207 
2208         set_fdc(DRIVE(CURRENT->dev));
2209 
2210         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2211                 FD_RAW_NEED_SEEK;
2212         raw_cmd.cmd_count = NR_RW;
2213         if (CURRENT->cmd == READ){
2214                 raw_cmd.flags |= FD_RAW_READ;
2215                 COMMAND = FM_MODE(floppy,FD_READ);
2216         } else if (CURRENT->cmd == WRITE){
2217                 raw_cmd.flags |= FD_RAW_WRITE;
2218                 COMMAND = FM_MODE(floppy,FD_WRITE);
2219         } else {
2220                 DPRINT("make_raw_rw_request: unknown command\n");
2221                 return 0;
2222         }
2223 
2224         max_sector = floppy->sect * floppy->head;
2225         TRACK = CURRENT->sector / max_sector;
2226         sector_t = CURRENT->sector % max_sector;
2227         if ( floppy->track && TRACK >= floppy->track )
2228                 return 0;
2229         HEAD = sector_t / floppy->sect;
2230 
2231         if ( TESTF( FD_NEED_TWADDLE) && sector_t < floppy->sect )
2232                 max_sector = floppy->sect;
2233 
2234         /* 2M disks have phantom sectors on the first track */
2235         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2236                 max_sector = 2 * floppy->sect / 3;
2237                 if (sector_t >= max_sector){
2238                         current_count_sectors =  (floppy->sect - sector_t);
2239                         if ( current_count_sectors > CURRENT->nr_sectors )
2240                                 current_count_sectors = CURRENT->nr_sectors;
2241                         return 1;
2242                 }
2243                 SIZECODE = 2;
2244         } else
2245                 SIZECODE = FD_SIZECODE(floppy);
2246         raw_cmd.rate = floppy->rate & 3;
2247         if ((floppy->rate & FD_2M) &&
2248             (TRACK || HEAD ) &&
2249             raw_cmd.rate == 2)
2250                 raw_cmd.rate = 1;
2251 
2252         if ( SIZECODE )
2253                 SIZECODE2 = 0xff;
2254         else
2255                 SIZECODE2 = 0x80;
2256         raw_cmd.track = TRACK << floppy->stretch;
2257         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
2258         GAP = floppy->gap;
2259         CODE2SIZE;
2260         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2261         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2262         tracksize = floppy->sect - floppy->sect % ssize;
2263         if ( tracksize < floppy->sect ){
2264                 SECT_PER_TRACK ++;
2265                 if (  tracksize <= sector_t % floppy->sect)
2266                         SECTOR--;
2267                 while ( tracksize <= sector_t % floppy->sect){
2268                         while( tracksize + ssize > floppy->sect ){
2269                                 SIZECODE--;
2270                                 ssize >>= 1;
2271                         }
2272                         SECTOR++; SECT_PER_TRACK ++;
2273                         tracksize += ssize;
2274                 }
2275                 max_sector = HEAD * floppy->sect + tracksize;
2276         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2277                 max_sector = floppy->sect;
2278 
2279         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2280         max_size = CURRENT->nr_sectors;
2281         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2282             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2283                 /* data already in track buffer */
2284                 if (CT(COMMAND) == FD_READ) {
2285                         copy_buffer(1, max_sector, buffer_max);
2286                         return 1;
2287                 }
2288         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2289                 if (CT(COMMAND) == FD_WRITE){
2290                         if(sector_t + CURRENT->nr_sectors > ssize &&
2291                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2292                                 max_size = ssize + ssize;
2293                         else
2294                                 max_size = ssize;
2295                 }
2296                 raw_cmd.flags &= ~FD_RAW_WRITE;
2297                 raw_cmd.flags |= FD_RAW_READ;
2298                 COMMAND = FM_MODE(floppy,FD_READ);
2299         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2300                 int direct, indirect;
2301 
2302                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2303                         sector_t;
2304 
2305                 max_size = buffer_chain_size();
2306                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2307                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2308                 /* 64 kb boundaries */
2309                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2310                      ((long) CURRENT->buffer ) / K_64 )
2311                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2312                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2313                 /*
2314                  * We try to read tracks, but if we get too many errors, we
2315                  * go back to reading just one sector at a time.
2316                  *
2317                  * This means we should be able to read a sector even if there
2318                  * are other bad sectors on this track.
2319                  */
2320                 if (!direct ||
2321                     (indirect * 2 > direct * 3 &&
2322                      *errors < DP->max_errors.read_track &&
2323                      /*!TESTF( FD_NEED_TWADDLE) &&*/
2324                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2325                         max_size = CURRENT->nr_sectors;
2326                 } else {
2327                         current_addr = CURRENT->buffer;
2328                         raw_cmd.length = current_count_sectors << 9;
2329                         if (raw_cmd.length == 0){
2330                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2331                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2332                                         indirect, direct, sector_t);
2333                                 return 0;
2334                         }
2335                         return 2;
2336                 }
2337         }
2338 
2339         if ( CT(COMMAND) == FD_READ )
2340                 max_size = max_sector; /* unbounded */
2341 
2342         /* claim buffer track if needed */
2343         if (buffer_track != raw_cmd.track ||  /* bad track */
2344             buffer_drive !=current_drive || /* bad drive */
2345             sector_t > buffer_max ||
2346             sector_t < buffer_min ||
2347             ((CT(COMMAND) == FD_READ ||
2348               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2349              max_sector > 2 * max_buffer_sectors + buffer_min &&
2350              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2351             /* not enough space */ ){
2352                 buffer_track = -1;
2353                 buffer_drive = current_drive;
2354                 buffer_max = buffer_min = aligned_sector_t;
2355         }
2356         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2357 
2358         if ( CT(COMMAND) == FD_WRITE ){
2359                 /* copy write buffer to track buffer.
2360                  * if we get here, we know that the write
2361                  * is either aligned or the data already in the buffer
2362                  * (buffer will be overwritten) */
2363 #ifdef CONFIG_FLOPPY_SANITY
2364                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2365                         DPRINT("internal error offset !=0 on write\n");
2366 #endif
2367                 buffer_track = raw_cmd.track;
2368                 buffer_drive = current_drive;
2369                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2370         } else
2371                 transfer_size(ssize, max_sector,
2372                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2373 
2374         /* round up current_count_sectors to get dma xfer size */
2375         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2376         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2377         raw_cmd.length <<= 9;
2378 #ifdef CONFIG_FLOPPY_SANITY
2379         if ((raw_cmd.length < current_count_sectors << 9) ||
2380             (current_addr != CURRENT->buffer &&
2381              CT(COMMAND) == FD_WRITE &&
2382              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2383               aligned_sector_t < buffer_min )) ||
2384             raw_cmd.length % ( 128 << SIZECODE ) ||
2385             raw_cmd.length <= 0 || current_count_sectors <= 0){
2386                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2387                         raw_cmd.length, current_count_sectors);
2388                 if ( current_addr != CURRENT->buffer )
2389                         printk("addr=%d, length=%ld\n",
2390                                (int) ((current_addr - floppy_track_buffer ) >> 9),
2391                                current_count_sectors);
2392                 printk("st=%d ast=%d mse=%d msi=%d\n",
2393                        sector_t, aligned_sector_t, max_sector, max_size);
2394                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2395                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2396                        COMMAND, SECTOR, HEAD, TRACK);
2397                 printk("buffer drive=%d\n", buffer_drive);
2398                 printk("buffer track=%d\n", buffer_track);
2399                 printk("buffer_min=%d\n", buffer_min );
2400                 printk("buffer_max=%d\n", buffer_max );
2401                 return 0;
2402         }
2403 
2404         if (current_addr != CURRENT->buffer ){
2405                 if (current_addr < floppy_track_buffer ||
2406                     current_count_sectors < 0 ||
2407                     raw_cmd.length < 0 ||
2408                     current_addr + raw_cmd.length >
2409                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2410                         DPRINT("buffer overrun in schedule dma\n");
2411                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2412                                sector_t, buffer_min,
2413                                raw_cmd.length >> 9 );
2414                         printk("current_count_sectors=%ld\n",
2415                                current_count_sectors);
2416                         if ( CT(COMMAND) == FD_READ )
2417                                 printk("read\n");
2418                         if ( CT(COMMAND) == FD_READ )
2419                                 printk("write\n");
2420                         return 0;
2421                 }
2422         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2423                    current_count_sectors > CURRENT->nr_sectors){
2424                 DPRINT("buffer overrun in direct transfer\n");
2425                 return 0;
2426         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2427                 DPRINT("more sectors than bytes\n");
2428                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2429                 printk("sectors=%ld\n", current_count_sectors);
2430         }
2431         if (raw_cmd.length == 0){
2432                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2433                 return 0;
2434         }
2435 #endif
2436         return 2;
2437 }
2438 
2439 static void redo_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2440 {
2441 #define REPEAT {request_done(0); continue; }
2442         int device;
2443         int tmp;
2444         int error;
2445 
2446         error = -1;
2447         if (current_drive < N_DRIVE)
2448                 floppy_off(current_drive);
2449 
2450         if (CURRENT && CURRENT->dev < 0) return;
2451 
2452         while(1){
2453                 if (!CURRENT) {
2454                         CLEAR_INTR;
2455                         unlock_fdc();
2456                         return;
2457                 }
2458                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2459                         panic(DEVICE_NAME ": request list destroyed");
2460                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2461                         panic(DEVICE_NAME ": block not locked");
2462 #if 0
2463                 if (!CURRENT->bh->b_count && 
2464                     (CURRENT->errors || error == CURRENT->dev)){
2465                         error=CURRENT->dev;
2466                         DPRINT("skipping read ahead buffer\n");
2467                         REPEAT;
2468                 }
2469 #endif
2470                 error=-1;
2471                 device = CURRENT->dev;
2472                 set_fdc( DRIVE(device));
2473 
2474                 del_timer(&fd_timeout);
2475                 fd_timeout.expires = DP->timeout;
2476                 add_timer(&fd_timeout);
2477 
2478                 set_floppy(device);
2479                 if(start_motor(redo_fd_request)) return;
2480                 if(test_bit(current_drive, &fake_change) ||
2481                    TESTF(FD_DISK_CHANGED)){
2482                         DPRINT("disk absent or changed during operation\n");
2483                         REPEAT;
2484                 }
2485                 if (!floppy) { /* Autodetection */
2486                         if (!probing){
2487                                 DRS->probed_format = 0;
2488                                 if ( next_valid_format() ){
2489                                         DPRINT("no autodetectable formats\n");
2490                                         floppy = NULL;
2491                                         REPEAT;
2492                                 }
2493                         }
2494                         probing = 1;
2495                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2496                 } else
2497                         probing = 0;
2498                 errors = & (CURRENT->errors);
2499                 tmp = make_raw_rw_request();
2500                 if ( tmp < 2 ){
2501                         request_done(tmp);
2502                         continue;
2503                 }
2504 
2505                 if (TESTF(FD_NEED_TWADDLE))
2506                         twaddle();
2507                 floppy_tq.routine = (void *)(void *) floppy_start;
2508                 queue_task(&floppy_tq, &tq_timer);
2509 #ifdef DEBUGT
2510                 debugt("queue fd request");
2511 #endif
2512                 return;
2513         }
2514 #undef REPEAT
2515 }
2516 
2517 static struct cont_t rw_cont={
2518         rw_interrupt,
2519         redo_fd_request,
2520         bad_flp_intr,
2521         request_done };
2522 
2523 struct tq_struct request_tq = 
2524 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2525 
2526 static void process_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2527 {
2528         cont = &rw_cont;
2529         queue_task(&request_tq, &tq_timer);
2530 }
2531 
2532 static void do_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2533 {
2534         if (fdc_busy)
2535                 /* fdc busy, this new request will be treated when the
2536                    current one is done */
2537                 return;
2538         /* fdc_busy cannot be set by an interrupt or a bh */
2539         floppy_grab_irq_and_dma();
2540         fdc_busy=1;
2541         process_fd_request();
2542 }
2543 
2544 static struct cont_t poll_cont={
2545         success_and_wakeup,
2546         floppy_ready,
2547         generic_failure,
2548         generic_done };
2549 
2550 static int poll_drive(int interruptible, int flag){
     /* [previous][next][first][last][top][bottom][index][help] */
2551         int ret;
2552         /* no auto-sense, just clear dcl */
2553         raw_cmd.flags= flag;
2554         raw_cmd.track=0;
2555         raw_cmd.cmd_count=0;
2556         cont = &poll_cont;
2557 #ifdef DCL_DEBUG
2558                 if (DP->flags & FD_DEBUG){
2559                         DPRINT("setting NEWCHANGE in poll_drive\n");
2560                 }
2561 #endif
2562         SETF(FD_DISK_NEWCHANGE);
2563         WAIT(floppy_ready);
2564         return ret;
2565 }
2566 
2567 /*
2568  * User triggered reset
2569  * ====================
2570  */
2571 
2572 static void reset_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2573 {
2574         printk("weird, reset interrupt called\n");
2575 }
2576 
2577 static struct cont_t reset_cont={
2578         reset_intr,
2579         success_and_wakeup,
2580         generic_failure,
2581         generic_done };
2582 
2583 static int user_reset_fdc(int drive, int arg, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
2584 {
2585         int ret;
2586 
2587         ret=0;
2588         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2589                 return 0;
2590         LOCK_FDC(drive,interruptible);
2591         if(arg == FD_RESET_ALWAYS)
2592                 FDCS->reset=1;
2593         if ( FDCS->reset ){
2594                 cont = &reset_cont;
2595                 del_timer(&fd_timeout);
2596                 fd_timeout.expires = DP->timeout;
2597                 add_timer(&fd_timeout);
2598                 WAIT(reset_fdc);
2599         }
2600         process_fd_request();
2601         return ret;
2602 }
2603 
2604 /*
2605  * Misc Ioctl's and support
2606  * ========================
2607  */
2608 static int fd_copyout(void *param, volatile void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2609 {
2610         int i;
2611 
2612         i = verify_area(VERIFY_WRITE,param,size);
2613         if (i)
2614                 return i;
2615         memcpy_tofs(param,(void *) address, size);
2616         return 0;
2617 }
2618 
2619 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2620 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2621 
2622 static char *drive_name(int type, int drive )
     /* [previous][next][first][last][top][bottom][index][help] */
2623 {
2624         struct floppy_struct *floppy;   
2625 
2626         if ( type )
2627                 floppy = floppy_type + type;
2628         else {
2629                 if ( UDP->native_format )
2630                         floppy = floppy_type + UDP->native_format;
2631                 else
2632                         return "(null)";
2633         }
2634         if ( floppy->name )
2635                 return floppy->name;
2636         else
2637                 return "(null)";
2638 }
2639 
2640 /* raw commands */
2641 static struct cont_t raw_cmd_cont={
2642         success_and_wakeup,
2643         failure_and_wakeup,
2644         generic_failure,
2645         generic_done };
2646 
2647 static int raw_cmd_ioctl(void *param)
     /* [previous][next][first][last][top][bottom][index][help] */
2648 {
2649         int i, drive, count, ret;
2650 
2651         if ( FDCS->rawcmd <= 1 )
2652                 FDCS->rawcmd = 1;
2653         for ( drive= 0; drive < N_DRIVE; drive++){
2654                 if ( FDC(drive) != fdc)
2655                         continue;
2656                 if ( drive == current_drive ){
2657                         if ( UDRS->fd_ref > 1 ){
2658                                 FDCS->rawcmd = 2;
2659                                 break;
2660                         }
2661                 } else if ( UDRS->fd_ref ){
2662                         FDCS->rawcmd = 2;
2663                         break;
2664                 }
2665         }
2666 
2667         if(FDCS->reset)
2668                 return -EIO;
2669 
2670         COPYIN(raw_cmd);
2671         raw_cmd.rate &= 0x03;   
2672         count = raw_cmd.length;
2673         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2674                 if(count > max_buffer_sectors * 1024 )
2675                         return -ENOMEM;
2676                 if(count == 0){
2677                         printk("attempt to do a 0 byte dma transfer\n");
2678                         return -EINVAL;
2679                 }
2680                 buffer_track = -1;
2681         }
2682         if ( raw_cmd.flags & FD_RAW_WRITE ){
2683                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2684                 if (i)
2685                         return i;
2686                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2687         }
2688 
2689         current_addr = floppy_track_buffer;
2690         cont = &raw_cmd_cont;
2691         IWAIT(floppy_start);
2692 #ifdef DCL_DEBUG
2693         if (DP->flags & FD_DEBUG){
2694                 DPRINT("calling disk change from raw_cmd ioctl\n");
2695         }
2696 #endif
2697         if( disk_change(current_drive) )
2698                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2699         else
2700                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2701         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2702                 motor_off_callback(current_drive);      
2703 
2704         if ( !ret && !FDCS->reset ){
2705                 raw_cmd.reply_count = inr;
2706                 for( i=0; i< raw_cmd.reply_count; i++)
2707                         raw_cmd.reply[i] = reply_buffer[i];
2708                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2709                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2710         } else
2711                 ret = -EIO;
2712         DRS->track = NO_TRACK;
2713         if ( ret )
2714                 return ret;
2715 
2716         if ( raw_cmd.flags & FD_RAW_READ ){
2717                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2718                 if (i)
2719                         return i;
2720         }
2721        
2722         return COPYOUT(raw_cmd);
2723 }
2724 
2725 static int invalidate_drive(int rdev)
     /* [previous][next][first][last][top][bottom][index][help] */
2726 {
2727         /* invalidate the buffer track to force a reread */
2728         set_bit( DRIVE(rdev), &fake_change);
2729         process_fd_request();
2730         check_disk_change(rdev);
2731         return 0;
2732 }
2733 
2734 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /* [previous][next][first][last][top][bottom][index][help] */
2735     unsigned long param)
2736 {
2737 #define IOCTL_MODE_BIT 8
2738 #define OPEN_WRITE_BIT 16
2739 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2740 
2741         struct floppy_struct newparams;
2742         struct format_descr tmp_format_req;
2743         int i,device,drive,type,cnt;
2744         struct floppy_struct *this_floppy;
2745         char *name;
2746 
2747         device = inode->i_rdev;
2748         switch (cmd) {
2749                 RO_IOCTLS(device,param);
2750         }
2751         type = TYPE(device);
2752         drive = DRIVE(device);
2753         switch (cmd) {
2754         case FDGETDRVTYP:
2755                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2756                 if (i)
2757                         return i;
2758                 name = drive_name(type,drive);
2759                 for ( cnt=0; cnt<16; cnt++){
2760                         put_fs_byte(name[cnt],
2761                                     ((char*)param)+cnt);
2762                         if ( ! *name )
2763                                 break;
2764                 }
2765                 return 0;
2766         case FDGETMAXERRS:
2767                 return COPYOUT(UDP->max_errors);
2768         case FDGETPRM:
2769                 if (type)
2770                         this_floppy = &floppy_type[type];
2771                 else if ((this_floppy = current_type[drive]) ==
2772                          NULL)
2773                         return -ENODEV;
2774                 return COPYOUT(this_floppy[0]);
2775         case FDPOLLDRVSTAT:
2776                 LOCK_FDC(drive,1);
2777                 CALL(poll_drive(1, FD_RAW_NEED_DISK));
2778                 process_fd_request();
2779                 /* fall through */
2780         case FDGETDRVSTAT:
2781                 return COPYOUT(*UDRS);
2782         case FDGETFDCSTAT:
2783                 return COPYOUT(*UFDCS);
2784         case FDGETDRVPRM:
2785                 return COPYOUT(*UDP);
2786         case FDWERRORGET:
2787                 return COPYOUT(*UDRWE);
2788         }
2789         if (!IOCTL_ALLOWED)
2790                 return -EPERM;
2791         switch (cmd) {
2792         case FDWERRORCLR:
2793                 UDRWE->write_errors = 0;
2794                 UDRWE->first_error_sector = 0;
2795                 UDRWE->first_error_generation = 0;
2796                 UDRWE->last_error_sector = 0;
2797                 UDRWE->last_error_generation = 0;
2798                 UDRWE->badness = 0;
2799                 return 0;
2800         case FDRAWCMD:
2801                 if (type)
2802                         return -EINVAL;
2803                 LOCK_FDC(drive,1);
2804                 set_floppy(device);
2805                 CALL(i = raw_cmd_ioctl((void *) param));
2806                 process_fd_request();
2807                 return i;
2808         case FDFMTTRK:
2809                 if (UDRS->fd_ref != 1)
2810                         return -EBUSY;
2811                 COPYIN(tmp_format_req);
2812                 return do_format(device, &tmp_format_req);
2813         case FDSETMAXERRS:
2814                 return COPYIN(UDP->max_errors);
2815         case FDFMTBEG:
2816                 return 0;
2817         case FDCLRPRM:
2818                 LOCK_FDC(drive,1);
2819                 current_type[drive] = NULL;
2820                 floppy_sizes[drive] = MAX_DISK_SIZE;
2821                 UDRS->keep_data = 0;
2822                 return invalidate_drive(device);
2823         case FDFMTEND:
2824         case FDFLUSH:
2825                 LOCK_FDC(drive,1);
2826                 return invalidate_drive(device);
2827         case FDSETPRM:
2828         case FDDEFPRM:
2829                 COPYIN(newparams);
2830                 /* sanity checking for parameters.*/
2831                 if(newparams.sect <= 0 ||
2832                    newparams.head <= 0 ||
2833                    newparams.track <= 0 ||
2834                    newparams.track >
2835                    UDP->tracks>>newparams.stretch)
2836                         return -EINVAL;
2837                 if ( type){
2838                         if ( !suser() )
2839                                 return -EPERM;
2840                         LOCK_FDC(drive,1);
2841                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2842                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2843                                     drive_state[cnt].fd_ref)
2844                                         set_bit(drive, &fake_change);
2845                         }
2846                         floppy_type[type] = newparams;
2847                         floppy_type[type].name="user format";
2848                         for (cnt = type << 2 ;
2849                              cnt < (type << 2 ) + 4 ;
2850                              cnt++)
2851                                 floppy_sizes[cnt]=
2852                                         floppy_sizes[cnt+0x80]=
2853                                                 floppy_type[type].size>>1;
2854                         process_fd_request();
2855                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2856                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2857                                     drive_state[cnt].fd_ref)
2858                                         check_disk_change(drive_state[cnt].
2859                                                           fd_device);
2860                         }
2861                         return 0;
2862                 }
2863 
2864                 LOCK_FDC(drive,1);
2865                 if ( cmd != FDDEFPRM )
2866                         /* notice a disk change immediately, else
2867                          * we loose our settings immediately*/
2868                         CALL(poll_drive(1,0));
2869                 user_params[drive] = newparams;
2870                 if (buffer_drive == drive &&
2871                     buffer_max > user_params[drive].sect)
2872                         buffer_max=user_params[drive].sect;
2873                 current_type[drive] = &user_params[drive];
2874                 floppy_sizes[drive] = user_params[drive].size >> 1;
2875                 if (cmd == FDDEFPRM)
2876                         DRS->keep_data = -1;
2877                 else
2878                         DRS->keep_data = 1;
2879                 /* invalidation. Invalidate only when needed, i.e.
2880                  * when there are already sectors in the buffer cache
2881                  * whose number will change. This is useful, because
2882                  * mtools often changes the geometry of the disk after
2883                  * looking at the boot block */
2884                 if (DRS->maxblock >
2885                     user_params[drive].sect ||
2886                     DRS->maxtrack )
2887                         invalidate_drive(device);
2888                 else
2889                         process_fd_request();
2890                 return 0;
2891         case FDRESET:
2892                 return user_reset_fdc( drive, (int)param, 1);
2893         case FDMSGON:
2894                 UDP->flags |= FTD_MSG;
2895                 return 0;
2896         case FDMSGOFF:
2897                 UDP->flags &= ~FTD_MSG;
2898                 return 0;
2899         case FDSETEMSGTRESH:
2900                 UDP->max_errors.reporting =
2901                         (unsigned short) (param & 0x0f);
2902                 return 0;
2903         case FDTWADDLE:
2904                 LOCK_FDC(drive,1);
2905                 twaddle();
2906                 process_fd_request();
2907         }
2908         if ( ! suser() )
2909                 return -EPERM;
2910         switch(cmd){
2911         case FDSETDRVPRM:
2912                 return COPYIN(*UDP);
2913         default:
2914                 return -EINVAL;
2915         }
2916         return 0;
2917 #undef IOCTL_ALLOWED
2918 }
2919 
2920 static void config_types(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2921 {
2922         int first=1;
2923         int drive;
2924 
2925         /* read drive info out of physical cmos */
2926         drive=0;
2927         if (!UDP->cmos )
2928                 UDP->cmos= FLOPPY0_TYPE;
2929         drive=1;
2930         if (!UDP->cmos && FLOPPY1_TYPE)
2931                 UDP->cmos = FLOPPY1_TYPE;
2932 
2933         /* XXX */
2934         /* additional physical CMOS drive detection should go here */
2935 
2936         for (drive=0; drive < N_DRIVE; drive++){
2937                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
2938                         memcpy((char *) UDP,
2939                                (char *) (&default_drive_params[(int)UDP->cmos].params),
2940                                sizeof(struct floppy_drive_params));
2941                 if (UDP->cmos){
2942                         if (first)
2943                                 printk("Floppy drive(s): ");
2944                         else
2945                                 printk(", ");
2946                         first=0;
2947                         if (UDP->cmos > 0 ){
2948                                 ALLOWED_DRIVE_MASK |= 1 << drive;
2949                                 printk("fd%d is %s", drive,
2950                                        default_drive_params[(int)UDP->cmos].name);
2951                         } else
2952                                 printk("fd%d is unknown type %d",drive,
2953                                        UDP->cmos);
2954                 }
2955         }
2956         if(!first)
2957                 printk("\n");
2958 }
2959 
2960 static int floppy_read(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
2961                        char * buf, int count)
2962 {
2963         int drive = DRIVE(inode->i_rdev);
2964 
2965         check_disk_change(inode->i_rdev);
2966         if (UTESTF(FD_DISK_CHANGED))
2967                 return -ENXIO;
2968         return block_read(inode, filp, buf, count);
2969 }
2970 
2971 static int floppy_write(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
2972                         char * buf, int count)
2973 {
2974         int block;
2975         int ret;
2976         int drive = DRIVE(inode->i_rdev);
2977 
2978         if(!UDRS->maxblock)
2979                 UDRS->maxblock=1;/* make change detectable */
2980         check_disk_change(inode->i_rdev);
2981         if (UTESTF(FD_DISK_CHANGED)) 
2982                 return -ENXIO;
2983         if(!UTESTF(FD_DISK_WRITABLE))
2984                 return -EROFS;
2985         block = (filp->f_pos + count) >> 9;
2986         if(block > UDRS->maxblock)
2987                 UDRS->maxblock = block;
2988         ret= block_write(inode, filp, buf, count);
2989         return ret;
2990 }
2991 
2992 static void floppy_release(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
2993 {
2994         int drive;
2995         
2996         drive = DRIVE(inode->i_rdev);
2997 
2998         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
2999                 /* if the file is mounted OR (writable now AND writable at
3000                  * open time) Linus: Does this cover all cases? */
3001                 block_fsync(inode,filp);
3002                         
3003         if (UDRS->fd_ref < 0)
3004                 UDRS->fd_ref=0;
3005         else if (!UDRS->fd_ref--) {
3006                 DPRINT("floppy_release with fd_ref == 0");
3007                 UDRS->fd_ref = 0;
3008         }
3009         floppy_release_irq_and_dma();
3010 }
3011 
3012 /*
3013  * floppy_open check for aliasing (/dev/fd0 can be the same as
3014  * /dev/PS0 etc), and disallows simultaneous access to the same
3015  * drive with different device numbers.
3016  */
3017 #define RETERR(x) \
3018         do{floppy_release(inode,filp); \
3019            return -(x);}while(0)
3020 
3021 static int floppy_open(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3022 {
3023         int drive;
3024         int old_dev;
3025 
3026         if (!filp) {
3027                 DPRINT("Weird, open called with filp=0\n");
3028                 return -EIO;
3029         }
3030 
3031         drive = DRIVE(inode->i_rdev);
3032         if (drive >= N_DRIVE || 
3033             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3034             fdc_state[FDC(drive)].version == FDC_NONE)
3035                 return -ENXIO;
3036 
3037         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3038                 return -ENXIO;
3039         old_dev = UDRS->fd_device;
3040         if (UDRS->fd_ref && old_dev != inode->i_rdev)
3041                 return -EBUSY;
3042 
3043         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3044                 USETF(FD_DISK_CHANGED);
3045                 USETF(FD_VERIFY);
3046         }
3047 
3048         if(UDRS->fd_ref == -1 ||
3049            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3050                 return -EBUSY;
3051 
3052         if (floppy_grab_irq_and_dma())
3053                 return -EBUSY;
3054 
3055         if (filp->f_flags & O_EXCL)
3056                 UDRS->fd_ref = -1;
3057         else
3058                 UDRS->fd_ref++;
3059 
3060         UDRS->fd_device = inode->i_rdev;
3061 
3062         if (old_dev && old_dev != inode->i_rdev) {
3063                 if (buffer_drive == drive)
3064                         buffer_track = -1;
3065                 invalidate_buffers(old_dev);
3066         }
3067 
3068         /* Allow ioctls if we have write-permissions even if read-only open */
3069         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3070                 filp->f_mode |= IOCTL_MODE_BIT;
3071         if (filp->f_mode & 2)
3072                 filp->f_mode |= OPEN_WRITE_BIT;
3073 
3074         if (UFDCS->rawcmd == 1)
3075                UFDCS->rawcmd = 2;
3076 
3077         if (filp->f_flags & O_NDELAY)
3078                 return 0;
3079         if (filp->f_mode & 3) {
3080                 UDRS->last_checked = 0;
3081                 check_disk_change(inode->i_rdev);
3082                 if (UTESTF(FD_DISK_CHANGED))
3083                         RETERR(ENXIO);
3084         }
3085         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3086                 RETERR(EROFS);
3087         return 0;
3088 #undef RETERR
3089 }
3090 
3091 /*
3092  * Check if the disk has been changed or if a change has been faked.
3093  */
3094 static int check_floppy_change(dev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3095 {
3096         int drive = DRIVE( dev );
3097 
3098         if (MAJOR(dev) != MAJOR_NR) {
3099                 DPRINT("floppy_changed: not a floppy\n");
3100                 return 0;
3101         }
3102 
3103         if (UTESTF(FD_DISK_CHANGED))
3104                 return 1;
3105 
3106         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3107                 lock_fdc(drive,0);
3108                 poll_drive(0,0);
3109                 process_fd_request();
3110         }
3111                 
3112         if(UTESTF(FD_DISK_CHANGED) ||
3113            test_bit(drive, &fake_change) ||
3114            (!TYPE(dev) && !current_type[drive]))
3115                 return 1;
3116         return 0;
3117 }
3118 
3119 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3120  * the bootblock (block 0). "Autodetection" is also needed to check whether
3121  * there is a disk in the drive at all... Thus we also do it for fixed
3122  * geometry formats */
3123 static int floppy_revalidate(dev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3124 {
3125 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3126         struct buffer_head * bh;
3127         int drive=DRIVE(dev);
3128         int cf;
3129 
3130         if(UTESTF(FD_DISK_CHANGED) || test_bit(drive, &fake_change) || NO_GEOM){
3131                 lock_fdc(drive,0);
3132                 cf = UTESTF(FD_DISK_CHANGED);
3133                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3134                         process_fd_request(); /*already done by another thread*/
3135                         return 0;
3136                 }
3137                 UDRS->maxblock = 0;
3138                 UDRS->maxtrack = 0;
3139                 if ( buffer_drive == drive)
3140                         buffer_track = -1;
3141                 clear_bit(drive, &fake_change);
3142                 UCLEARF(FD_DISK_CHANGED);
3143                 if(cf)
3144                         UDRS->generation++;
3145                 if(NO_GEOM){
3146                         /* auto-sensing */
3147                         int size = floppy_blocksizes[MINOR(dev)];
3148                         if (!size)
3149                                 size = 1024;
3150                         if (!(bh = getblk(dev,0,size))){
3151                                 process_fd_request();
3152                                 return 1;
3153                         }
3154                         if ( bh && ! bh->b_uptodate)
3155                                 ll_rw_block(READ, 1, &bh);
3156                         process_fd_request();
3157                         wait_on_buffer(bh);
3158                         brelse(bh);
3159                         return 0;
3160                 } 
3161                 if(cf)
3162                                 poll_drive(0, FD_RAW_NEED_DISK);
3163                 process_fd_request();
3164         }
3165         return 0;
3166 }
3167 
3168 static struct file_operations floppy_fops = {
3169         NULL,                   /* lseek - default */
3170         floppy_read,            /* read - general block-dev read */
3171         floppy_write,           /* write - general block-dev write */
3172         NULL,                   /* readdir - bad */
3173         NULL,                   /* select */
3174         fd_ioctl,               /* ioctl */
3175         NULL,                   /* mmap */
3176         floppy_open,            /* open */
3177         floppy_release,         /* release */
3178         block_fsync,            /* fsync */
3179         NULL,                   /* fasync */
3180         check_floppy_change,    /* media_change */
3181         floppy_revalidate,      /* revalidate */
3182 };
3183 
3184 /*
3185  * Floppy Driver initialisation
3186  * =============================
3187  */
3188 
3189 /* Determine the floppy disk controller type */
3190 /* This routine was written by David C. Niemi */
3191 static char get_fdc_version(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3192 {
3193         int r;
3194 
3195         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3196         if ( FDCS->reset )
3197                 return FDC_NONE;
3198         if ( (r = result()) <= 0x00)
3199                 return FDC_NONE;        /* No FDC present ??? */
3200         if ((r==1) && (reply_buffer[0] == 0x80)){
3201                 printk("FDC %d is a 8272A\n",fdc);
3202                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3203         }
3204         if (r != 10) {
3205                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3206                 return FDC_UNKNOWN;
3207         }
3208         output_byte(FD_VERSION);
3209         r = result();
3210         if ((r == 1) && (reply_buffer[0] == 0x80)){
3211                 printk("FDC %d is a 82072\n",fdc);
3212                 return FDC_82072;               /* 82072 doesn't know VERSION */
3213         }
3214         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3215                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3216                 return FDC_UNKNOWN;
3217         }
3218         output_byte(FD_UNLOCK);
3219         r = result();
3220         if ((r == 1) && (reply_buffer[0] == 0x80)){
3221                 printk("FDC %d is a pre-1991 82077\n", fdc);
3222                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3223         }
3224         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3225                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3226                 return FDC_UNKNOWN;
3227         }
3228         printk("FDC %d is a post-1991 82077\n",fdc);
3229         return FDC_82077;       /* Revised 82077AA passes all the tests */
3230 } /* get_fdc_version */
3231 
3232 /* lilo configuration */
3233 
3234 /* we make the invert_dcl function global. One day, somebody might
3235 want to centralize all thinkpad related options into one lilo option,
3236 there are just so many thinkpad related quirks! */
3237 void floppy_invert_dcl(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3238 {
3239         int i;
3240         
3241         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3242                 if (param)
3243                         default_drive_params[i].params.flags |= 0x80;
3244                 else
3245                         default_drive_params[i].params.flags &= ~0x80;
3246         }
3247         DPRINT("Configuring drives for inverted dcl\n");
3248 }
3249 
3250 static void daring(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3251 {
3252         int i;
3253 
3254         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3255                 if (param){
3256                         default_drive_params[i].params.select_delay = 0;
3257                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3258                 } else {
3259                         default_drive_params[i].params.select_delay = 2*HZ/100;
3260                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3261                 }
3262         }
3263         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3264 }
3265 
3266 static void allow_drives(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3267 {
3268         ALLOWED_DRIVE_MASK=param;
3269         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3270 }
3271 
3272 static void fdc2_adr(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3273 {
3274         FDC2 = param;
3275         if(param)
3276                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3277         else
3278                 DPRINT("disabling second fdc\n");
3279 }
3280 
3281 static void unex(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3282 {
3283         print_unex = param;
3284         DPRINT1("%sprinting messages for unexpected interrupts\n",
3285                 param ? "" : "not ");
3286 }
3287 
3288 static void set_cmos(int *ints, int dummy)
     /* [previous][next][first][last][top][bottom][index][help] */
3289 {
3290         int current_drive=0;
3291 
3292         if ( ints[0] != 2 ){
3293                 DPRINT("wrong number of parameter for cmos\n");
3294                 return;
3295         }
3296         current_drive = ints[1];
3297         if (current_drive < 0 || current_drive >= 8 ){
3298                 DPRINT("bad drive for set_cmos\n");
3299                 return;
3300         }
3301         if(ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3302                 DPRINT1("bad cmos code %d\n", ints[2]);
3303                 return;
3304         }
3305         DP->cmos = ints[2];
3306         DPRINT1("setting cmos code to %d\n", ints[2]);
3307 }
3308                 
3309 static struct param_table {
3310         char *name;
3311         void (*fn)(int *ints, int param);
3312         int def_param;
3313 } config_params[]={
3314 { "allowed_drive_mask", allow_drives, 0xff },
3315 { "all_drives", allow_drives, 0xff },
3316 { "asus_pci", allow_drives, 0x33 },
3317 
3318 { "daring", daring, 1},
3319 
3320 { "two_fdc", fdc2_adr, 0x370 },
3321 { "one_fdc", fdc2_adr, 0 },
3322 
3323 { "thinkpad", floppy_invert_dcl, 1 },
3324 
3325 { "cmos", set_cmos, 0 },
3326 
3327 { "unexpected_interrupts", unex, 1 },
3328 { "no_unexpected_interrupts", unex, 0 },
3329 { "L40SX", unex, 0 } };
3330 
3331 #define FLOPPY_SETUP
3332 void floppy_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
3333 {
3334         int i;
3335         int param;
3336         if(!str)
3337                 return;
3338         for(i=0; i< ARRAY_SIZE(config_params); i++){
3339                 if (strcmp(str,config_params[i].name) == 0 ){
3340                         if (ints[0] )
3341                                 param = ints[1];
3342                         else
3343                                 param = config_params[i].def_param;
3344                         config_params[i].fn(ints,param);
3345                         return;
3346                 }
3347         }
3348         DPRINT1("unknown floppy option %s\n", str);
3349         DPRINT("allowed options are:");
3350         for(i=0; i< ARRAY_SIZE(config_params); i++)
3351                 printk(" %s",config_params[i].name);
3352         printk("\n");
3353         DPRINT("Read linux/drivers/block/README.fd\n");
3354 }
3355 
3356 #ifdef FD_MODULE
3357 static
3358 #endif
3359 int new_floppy_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3360 {
3361         int i,drive;
3362         int have_no_fdc=0;
3363 
3364         sti();
3365 
3366         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3367                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3368                 return -EBUSY;
3369         }
3370 
3371         for(i=0; i<256; i++)
3372                 if ( TYPE(i))
3373                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3374                 else
3375                         floppy_sizes[i] = MAX_DISK_SIZE;
3376 
3377         blk_size[MAJOR_NR] = floppy_sizes;
3378         blksize_size[MAJOR_NR] = floppy_blocksizes;
3379         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3380         del_timer(&fd_timeout);
3381         config_types();
3382 
3383         fdc_state[0].address = FDC1;
3384         fdc_state[0].dor = 0;
3385 #if N_FDC > 1
3386         fdc_state[1].address = FDC2;
3387         fdc_state[1].dor = 0;
3388 #endif
3389 
3390         for (i = 0 ; i < N_FDC ; i++) {
3391                 fdc = i;
3392                 FDCS->dtr = -1;
3393                 FDCS->dor = 0x4;
3394                 FDCS->reset = 0;
3395                 FDCS->version = FDC_NONE;
3396         }
3397 
3398         if(floppy_grab_irq_and_dma()){
3399                 unregister_blkdev(MAJOR_NR,"fd");
3400                 return -EBUSY;
3401         }
3402 
3403         /* initialise drive state */
3404         for (drive = 0; drive < N_DRIVE ; drive++) {
3405                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3406                 UDRS->generation = 0;
3407                 UDRS->keep_data = 0;
3408                 UDRS->fd_ref = 0;
3409                 UDRS->fd_device = 0;
3410                 UDRWE->write_errors = 0;
3411                 UDRWE->first_error_sector = 0;
3412                 UDRWE->first_error_generation = 0;
3413                 UDRWE->last_error_sector = 0;
3414                 UDRWE->last_error_generation = 0;
3415                 UDRWE->badness = 0;
3416         }
3417 
3418         for (i = 0 ; i < N_FDC ; i++) {
3419                 fdc = i;
3420                 if (FDCS->address == -1 )
3421                         continue;
3422                 FDCS->rawcmd = 2;
3423                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3424                         FDCS->address = -1;
3425                         continue;
3426                 }
3427                 /* Try to determine the floppy controller type */
3428                 FDCS->version = get_fdc_version();
3429                 if (FDCS->version == FDC_NONE){
3430                         FDCS->address = -1;
3431                         continue;
3432                 }
3433 
3434                 have_no_fdc = 0;
3435                 /* Not all FDCs seem to be able to handle the version command
3436                  * properly, so force a reset for the standard FDC clones,
3437                  * to avoid interrupt garbage.
3438                  */
3439                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3440                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3441         }
3442         fdc=0;
3443         current_drive = 0;
3444         floppy_release_irq_and_dma();
3445         initialising=0;
3446         if(have_no_fdc)
3447                 unregister_blkdev(MAJOR_NR,"fd");
3448         return have_no_fdc;
3449 }
3450 
3451 /* stupid compatibility hack... */
3452 void floppy_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3453 {
3454         new_floppy_init();
3455 }
3456 
3457 static int floppy_grab_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3458 {
3459         int i;
3460         cli();
3461         if (usage_count++){
3462                 sti();
3463                 return 0;
3464         }
3465         sti();
3466 #ifdef FD_MODULE
3467         MOD_INC_USE_COUNT;
3468 #endif
3469         for(i=0; i< N_FDC; i++){
3470                 if(FDCS->address != -1){        
3471                         fdc = i;
3472                         reset_fdc_info(1);
3473                         outb_p(FDCS->dor, FD_DOR);
3474                 }
3475         }
3476         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3477 
3478         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
3479                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3480                         FLOPPY_IRQ);
3481                 return -1;
3482         }
3483         if (request_dma(FLOPPY_DMA,"floppy")) {
3484                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3485                         FLOPPY_DMA);
3486                 free_irq(FLOPPY_IRQ);
3487                 return -1;
3488         }
3489         for(fdc = 0; fdc < N_FDC ; fdc++)
3490                 if(FDCS->address != -1)
3491                         outb_p(FDCS->dor, FD_DOR);
3492         fdc = 0;
3493         enable_irq(FLOPPY_IRQ);
3494         return 0;
3495 }
3496 
3497 static void floppy_release_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3498 {
3499 #ifdef CONFIG_FLOPPY_SANITY
3500         int drive;
3501 #endif
3502         cli();
3503         if (--usage_count){
3504                 sti();
3505                 return;
3506         }
3507         sti();
3508 #ifdef FD_MODULE
3509         MOD_DEC_USE_COUNT;
3510 #endif
3511         disable_dma(FLOPPY_DMA);
3512         free_dma(FLOPPY_DMA);
3513         disable_irq(FLOPPY_IRQ);
3514         free_irq(FLOPPY_IRQ);
3515 
3516         set_dor(0, ~0, 8);
3517 #if N_FDC > 1
3518         set_dor(1, ~8, 0);
3519 #endif
3520         floppy_enable_hlt();
3521 #ifdef CONFIG_FLOPPY_SANITY
3522         for(drive=0; drive < N_FDC * 4; drive++)
3523                 if( motor_off_timer[drive].next )
3524                         printk("motor off timer %d still active\n", drive);
3525         
3526         if(fd_timeout.next)
3527                 printk("floppy timer still active\n");
3528         if (fd_timer.next)
3529                 printk("auxiliary floppy timer still active\n");
3530         if(floppy_tq.sync)
3531                 printk("task queue still active\n");
3532 #endif
3533 }
3534 

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