root/drivers/block/floppy.c

/* */

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