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. set_base_type
75. config_types
76. floppy_read
77. floppy_write
78. floppy_release
79. floppy_open
80. check_floppy_change
81. floppy_revalidate
82. get_fdc_version
83. invert_dcl
84. allow_drives
85. twofdc
86. floppy_setup
87. new_floppy_init
88. floppy_init
89. floppy_grab_irq_and_dma
90. 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 #define  CONFIG_FLOPPY_2_FDC
  86 #undef  CONFIG_FLOPPY_SILENT_DCL_CLEAR
  87 
  88 #define REALLY_SLOW_IO
  89 
  90 #define DEBUGT 2
  91 #define DCL_DEBUG /* debug disk change line */
  92 
  93 #include <linux/config.h>
  94 
  95 #ifndef FD_MODULE
  96 /* the following is the mask of allowed drives. By default units 2 and
  97  * 3 of both floppy controllers are disabled, because switching on the
  98  * motor of these drives causes system hangs on some PCI computers. drive
  99  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 100  * a drive is allowed. */
 101 static int ALLOWED_DRIVE_MASK=0x33;
 102 
 103 #define FLOPPY_IRQ 6
 104 #define FLOPPY_DMA 2
 105 #define FDC1 0x3f0
 106 static int FDC2=-1;
 107 #endif
 108 
 109 #define MODULE_AWARE_DRIVER
 110 
 111 #include <linux/sched.h>
 112 #include <linux/fs.h>
 113 #include <linux/kernel.h>
 114 #include <linux/timer.h>
 115 #include <linux/tqueue.h>
 116 #define FDPATCHES
 117 #include <linux/fdreg.h>
 118 #include <linux/fd.h>
 119 #include <linux/errno.h>
 120 #include <linux/malloc.h>
 121 #include <linux/string.h>
 122 #include <linux/fcntl.h>
 123 #include <linux/delay.h>
 124 #include <linux/mc146818rtc.h> /* CMOS defines */
 125 
 126 #include <asm/dma.h>
 127 #include <asm/irq.h>
 128 #include <asm/system.h>
 129 #include <asm/io.h>
 130 #include <asm/segment.h>
 131 
 132 #define MAJOR_NR FLOPPY_MAJOR
 133 #include "blk.h"
 134 
 135 static unsigned int fake_change = 0;
 136 static int initialising=1;
 137 
 138 #define FLOPPY0_TYPE    ((CMOS_READ(0x10) >> 4) & 15)
 139 #define FLOPPY1_TYPE    (CMOS_READ(0x10) & 15)
 140 
 141 /*
 142  * Again, the CMOS information doesn't work on the alpha..
 143  */
 144 #ifdef __alpha__
 145 #undef FLOPPY0_TYPE
 146 #undef FLOPPY1_TYPE
 147 #define FLOPPY0_TYPE 6
 148 #define FLOPPY1_TYPE 0
 149 #endif
 150 
 151 
 152 #ifdef CONFIG_FLOPPY_2_FDC
 153 #define N_FDC 2
 154 #define N_DRIVE 8
 155 #else
 156 #define N_FDC 1
 157 #define N_DRIVE 4
 158 #endif
 159 
 160 #define TYPE(x) ( ((x)>>2) & 0x1f )
 161 #define DRIVE(x) ( ((x)&0x03) | (((x)&0x80 ) >> 5))
 162 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 163 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 164 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 165                                 /* reverse mapping from unit and fdc to drive */
 166 #define DP (&drive_params[current_drive])
 167 #define DRS (&drive_state[current_drive])
 168 #define DRWE (&write_errors[current_drive])
 169 #define FDCS (&fdc_state[fdc])
 170 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 171 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 172 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 173 
 174 #define UDP (&drive_params[drive])
 175 #define UDRS (&drive_state[drive])
 176 #define UDRWE (&write_errors[drive])
 177 #define UFDCS (&fdc_state[FDC(drive)])
 178 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 179 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 180 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 181 
 182 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive);
 183 
 184 #define DPRINT1(x,x1) \
 185 printk(DEVICE_NAME "%d: " x,current_drive,(x1));
 186 
 187 #define DPRINT2(x,x1,x2) \
 188 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2));
 189 
 190 #define DPRINT3(x,x1,x2,x3) \
 191 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3));
 192 
 193 /* read/write */
 194 #define COMMAND raw_cmd.cmd[0]
 195 #define DR_SELECT raw_cmd.cmd[1]
 196 #define TRACK raw_cmd.cmd[2]
 197 #define HEAD raw_cmd.cmd[3]
 198 #define SECTOR raw_cmd.cmd[4]
 199 #define SIZECODE raw_cmd.cmd[5]
 200 #define SECT_PER_TRACK raw_cmd.cmd[6]
 201 #define GAP raw_cmd.cmd[7]
 202 #define SIZECODE2 raw_cmd.cmd[8]
 203 #define NR_RW 9
 204 
 205 /* format */
 206 #define F_SIZECODE raw_cmd.cmd[2]
 207 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 208 #define F_GAP raw_cmd.cmd[4]
 209 #define F_FILL raw_cmd.cmd[5]
 210 #define NR_F 6
 211 
 212 /*
 213  * Maximum disk size (in kilobytes). This default is used whenever the
 214  * current disk size is unknown.
 215  * [Now it is rather a minimum]
 216  */
 217 #define MAX_DISK_SIZE 2 /* 3984*/
 218 
 219 
 220 
 221 /*
 222  * The DMA channel used by the floppy controller cannot access data at
 223  * addresses >= 16MB
 224  *
 225  * Went back to the 1MB limit, as some people had problems with the floppy
 226  * driver otherwise. It doesn't matter much for performance anyway, as most
 227  * floppy accesses go through the track buffer.
 228  */
 229 #define LAST_DMA_ADDR   (0x1000000)
 230 #define K_64 (0x10000) /* 64 k */
 231 
 232 /*
 233  * globals used by 'result()'
 234  */
 235 #define MAX_REPLIES 10
 236 static unsigned char reply_buffer[MAX_REPLIES];
 237 static int inr; /* size of reply buffer, when called from interrupt */
 238 #define ST0 (reply_buffer[0])
 239 #define ST1 (reply_buffer[1])
 240 #define ST2 (reply_buffer[2])
 241 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 242 #define R_TRACK (reply_buffer[3])
 243 #define R_HEAD (reply_buffer[4])
 244 #define R_SECTOR (reply_buffer[5])
 245 #define R_SIZECODE (reply_buffer[6])
 246 
 247 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 248 /*
 249  * this struct defines the different floppy drive types.
 250  */
 251 static struct {
 252         struct floppy_drive_params params;
 253         char *name; /* name printed while booting */
 254 } default_drive_params[]= {
 255 /* NOTE: the time values in jiffies should be in msec!
 256  CMOS drive type
 257   |     Maximum data rate supported by drive type
 258   |     |   Head load time, msec
 259   |     |   |   Head unload time, msec (not used)
 260   |     |   |   |     Step rate interval, usec
 261   |     |   |   |     |    Time needed for spinup time (jiffies)
 262   |     |   |   |     |    |    Timeout for spinning down (jiffies)
 263   |     |   |   |     |    |    |   Spindown offset (where disk stops)
 264   |     |   |   |     |    |    |   |  Select delay
 265   |     |   |   |     |    |    |   |  |  RPS
 266   |     |   |   |     |    |    |   |  |  |    Max number of tracks
 267   |     |   |   |     |    |    |   |  |  |    |     Interrupt timeout
 268   |     |   |   |     |    |    |   |  |  |    |     |   Max nonintlv. sectors
 269   |     |   |   |     |    |    |   |  |  |    |     |   | -Max Errors- flags */
 270 {{0,  500, 16, 16, 8000, 100, 300,  0, 2, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 271       0, { 7, 4, 8, 2, 1, 5, 3,10}, 150, 0 }, "unknown" },
 272 
 273 {{1,  300, 16, 16, 8000, 100, 300,  0, 2, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 274       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 150, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 275 
 276 {{2,  500, 16, 16, 6000,  40, 300, 14, 2, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 277       0, { 2, 5, 6,23,10,20,11, 0}, 150, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 278 
 279 {{3,  250, 16, 16, 3000, 100, 300,  0, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 280       0, { 4,22,21,30, 3, 0, 0, 0}, 150, 4 }, "720k" }, /*3 1/2 DD*/
 281 
 282 {{4,  500, 16, 16, 4000,  40, 300, 10, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 283       0, { 7, 4,25,22,31,21,29,11}, 150, 7 }, "1.44M" }, /*3 1/2 HD*/
 284 
 285 {{5, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 286       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 287 
 288 {{6, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 289       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M" } /*3 1/2 ED*/
 290 /*    |  ---autodetected formats--   |   |      |
 291       read_track                     |   |    Name printed when booting
 292                                      |  Native format
 293                                    Frequency of disk change checks */
 294 };
 295 
 296 static struct floppy_drive_params drive_params[N_DRIVE];
 297 static struct floppy_drive_struct drive_state[N_DRIVE];
 298 static struct floppy_write_errors write_errors[N_DRIVE];
 299 static struct floppy_raw_cmd raw_cmd;
 300 
 301 /*
 302  * This struct defines the different floppy types.
 303  *
 304  * The 'stretch' tells if the tracks need to be doubled for some
 305  * types (ie 360kB diskette in 1.2MB drive etc). Others should
 306  * be self-explanatory.
 307  */
 308 static struct floppy_struct floppy_type[32] = {
 309         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 310         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 311         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 312         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 313         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 314         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 315         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 316         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 317         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 318         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 319 
 320         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 321         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 322         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 323         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 324         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 325         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 326         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 327         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 328         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 329         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 330 
 331         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 332         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 333         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 334         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 335         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 336         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 337         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 338         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 339         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 340 
 341         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 342         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 343         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 344 };
 345 
 346 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 347 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 348 
 349 /* Auto-detection: Disk type used until the next media change occurs. */
 350 struct floppy_struct *current_type[N_DRIVE] = {
 351         NULL, NULL, NULL, NULL
 352 #ifdef CONFIG_FLOPPY_2_FDC
 353         ,
 354         NULL, NULL, NULL, NULL
 355 #endif
 356 };
 357 
 358 /*
 359  * User-provided type information. current_type points to
 360  * the respective entry of this array.
 361  */
 362 struct floppy_struct user_params[N_DRIVE];
 363 
 364 static int floppy_sizes[256];
 365 static int floppy_blocksizes[256] = { 0, };
 366 
 367 /*
 368  * The driver is trying to determine the correct media format
 369  * while probing is set. rw_interrupt() clears it after a
 370  * successful access.
 371  */
 372 static int probing = 0;
 373 
 374 /* Synchronization of FDC access. */
 375 #define FD_COMMAND_DETECT -2
 376 #define FD_COMMAND_NONE -1
 377 #define FD_COMMAND_ERROR 2
 378 #define FD_COMMAND_OKAY 3
 379 
 380 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 381 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 382 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 383 #define CALL(x) if( (x) == -EINTR) return -EINTR;
 384 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 385 #define WAIT(x) _WAIT((x),interruptible)
 386 #define IWAIT(x) _WAIT((x),1)
 387 
 388 /* Errors during formatting are counted here. */
 389 static int format_errors;
 390 
 391 /* Format request descriptor. */
 392 static struct format_descr format_req;
 393 
 394 /*
 395  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 396  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 397  * H is head unload time (1=16ms, 2=32ms, etc)
 398  */
 399 
 400 /*
 401  * Track buffer
 402  * Because these are written to by the DMA controller, they must
 403  * not contain a 64k byte boundary crossing, or data will be
 404  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 405  * Note that you must not change the sizes below without updating head.S.
 406  */
 407 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 408 #define max_buffer_sectors MAX_BUFFER_SECTORS
 409 
 410 int *errors;
 411 typedef void (*done_f)(int);
 412 struct cont_t {
 413 void (*interrupt)(void); /* this is called after the interrupt of the
 414                           * main command */
 415 void (*redo)(void); /* this is called to retry the operation */
 416 void (*error)(void); /* this is called to tally an error */
 417 done_f done; /* this is called to say if the operation has succeeded/failed */
 418 } *cont;
 419 
 420 static void floppy_ready(void);
 421 static void floppy_start(void);
 422 static void process_fd_request(void);
 423 static void recalibrate_floppy(void);
 424 static void floppy_shutdown(void);
 425 
 426 static int floppy_grab_irq_and_dma(void);
 427 static void floppy_release_irq_and_dma(void);
 428 
 429 /*
 430  * The "reset" variable should be tested whenever an interrupt is scheduled,
 431  * after the commands have been sent. This is to ensure that the driver doesn't
 432  * get wedged when the interrupt doesn't come because of a failed command.
 433  * reset doesn't need to be tested before sending commands, because
 434  * output_byte is automatically disabled when reset is set.
 435  */
 436 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 437 static void reset_fdc(void);
 438 
 439 /*
 440  * These are global variables, as that's the easiest way to give
 441  * information to interrupts. They are the data used for the current
 442  * request.
 443  */
 444 #define NO_TRACK -1
 445 #define NEED_1_RECAL -2
 446 #define NEED_2_RECAL -3
 447 
 448 /* */
 449 static int usage_count = 0;
 450 
 451 
 452 /* buffer related variables */
 453 static int buffer_track = -1;
 454 static int buffer_drive = -1;
 455 static int buffer_min = -1;
 456 static int buffer_max = -1;
 457 
 458 /* fdc related variables, should end up in a struct */
 459 static struct floppy_fdc_state fdc_state[N_FDC];
 460 static int fdc; /* current fdc */
 461 
 462 static struct floppy_struct * floppy = floppy_type;
 463 static unsigned char current_drive = 0;
 464 static long current_count_sectors = 0;
 465 static char *current_addr = 0;
 466 static unsigned char sector_t; /* sector in track */
 467 
 468 #ifdef DEBUGT
 469 long unsigned debugtimer;
 470 #endif
 471 
 472 /*
 473  * Debugging
 474  * =========
 475  */
 476 static inline void set_debugt(void)
     /*  */
 477 {
 478 #ifdef DEBUGT
 479         debugtimer = jiffies;
 480 #endif
 481 }
 482 
 483 static inline void debugt(char *message)
     /*  */
 484 {
 485 #ifdef DEBUGT
 486   if ( DP->flags & DEBUGT )
 487         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 488 #endif
 489 }
 490 
 491 /*
 492  * Bottom half floppy driver.
 493  * ==========================
 494  *
 495  * This part of the file contains the code talking directly to the hardware,
 496  * and also the main service loop (seek-configure-spinup-command)
 497  */
 498 
 499 /*
 500  * disk change.
 501  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 502  * and the last_checked date.
 503  *
 504  * last_checked is the date of the last check which showed 'no disk change'
 505  * FD_DISK_CHANGE is set under two conditions:
 506  * 1. The floppy has been changed after some i/o to that floppy already
 507  *    took place.
 508  * 2. No floppy disk is in the drive. This is done in order to ensure that
 509  *    requests are quickly flushed in case there is no disk in the drive. It
 510  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 511  *    the drive.
 512  *
 513  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 514  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 515  *  each seek. If a disk is present, the disk change line should also be
 516  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 517  *  change line is set, this means either that no disk is in the drive, or
 518  *  that it has been removed since the last seek.
 519  *
 520  * This means that we really have a third possibility too:
 521  *  The floppy has been changed after the last seek.
 522  */
 523 
 524 static int disk_change(int drive)
     /*  */
 525 {
 526         int fdc=FDC(drive);
 527 #ifdef CONFIG_FLOPPY_SANITY
 528         if(jiffies < UDP->select_delay + UDRS->select_date)
 529                 DPRINT("WARNING disk change called early\n");
 530         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 531            (FDCS->dor & 3) != UNIT(drive) ||
 532            fdc != FDC(drive)){
 533                 DPRINT("probing disk change on unselected drive\n");
 534                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 535                         FDCS->dor);
 536         }
 537 #endif
 538 
 539 #ifdef DCL_DEBUG
 540         if (UDP->flags & FD_DEBUG){
 541                 DPRINT1("checking disk change line for drive %d\n",drive);
 542                 DPRINT1("jiffies=%ld\n", jiffies);
 543                 DPRINT1("disk change line=%x\n",inb_p(FD_DIR)&0x80);
 544                 DPRINT1("flags=%x\n",UDRS->flags);
 545         }
 546 #endif
 547         if (UDP->flags & FD_BROKEN_DCL)
 548                 return UTESTF(FD_DISK_CHANGED);
 549         if( (inb_p(FD_DIR) ^ UDP->flags) & 0x80){
 550                 USETF(FD_VERIFY); /* verify write protection */         
 551                 if(UDRS->maxblock){
 552                         /* mark it changed */
 553                         USETF(FD_DISK_CHANGED);
 554 
 555                         /* invalidate its geometry */
 556                         if (UDRS->keep_data >= 0) {
 557                                 if ((UDP->flags & FTD_MSG) &&
 558                                     current_type[drive] != NULL)
 559                                         DPRINT("Disk type is undefined after "
 560                                                "disk change\n");
 561                                 current_type[drive] = NULL;
 562                                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] = MAX_DISK_SIZE;
 563                         }
 564                 }
 565                 /*USETF(FD_DISK_NEWCHANGE);*/
 566                 return 1;
 567         } else {
 568                 UDRS->last_checked=jiffies;
 569                 UCLEARF(FD_DISK_NEWCHANGE);
 570         }
 571         return 0;
 572 }
 573 
 574 static inline int is_selected(int dor, int unit)
     /*  */
 575 {
 576         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 577 }
 578 
 579 static int set_dor(int fdc, char mask, char data)
     /*  */
 580 {
 581         register unsigned char drive, unit, newdor,olddor;
 582 
 583         if(FDCS->address == -1)
 584                 return -1;
 585 
 586         olddor = FDCS->dor;
 587         newdor =  (olddor & mask) | data;
 588         if ( newdor != olddor ){
 589                 unit = olddor & 0x3;
 590                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 591                         drive = REVDRIVE(fdc,unit);
 592 #ifdef DCL_DEBUG
 593         if (UDP->flags & FD_DEBUG){
 594                 DPRINT("calling disk change from set_dor\n");
 595         }
 596 #endif
 597                         disk_change(drive);
 598                 }
 599                 FDCS->dor = newdor;
 600                 outb_p(newdor, FD_DOR);
 601 
 602                 unit = newdor & 0x3;
 603                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 604                         drive = REVDRIVE(fdc,unit);
 605                         UDRS->select_date = jiffies;
 606                 }
 607         }
 608         if ( newdor & 0xf0 )
 609                 floppy_grab_irq_and_dma();
 610         if( olddor & 0xf0 )
 611                 floppy_release_irq_and_dma();
 612         return olddor;
 613 }
 614 
 615 static void twaddle(void)
     /*  */
 616 {
 617         if (DP->select_delay)
 618                 return;
 619         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 620         outb_p(FDCS->dor, FD_DOR);
 621         DRS->select_date = jiffies;
 622 }
 623 
 624 /* reset all driver information about the current fdc. This is needed after
 625  * a reset, and after a raw command. */
 626 static void reset_fdc_info(int mode)
     /*  */
 627 {
 628         int drive;
 629 
 630         FDCS->spec1 = FDCS->spec2 = -1;
 631         FDCS->need_configure = 1;
 632         FDCS->perp_mode = 1;
 633         FDCS->rawcmd = 0;
 634         for ( drive = 0; drive < N_DRIVE; drive++)
 635                 if (FDC(drive) == fdc &&
 636                     ( mode || UDRS->track != NEED_1_RECAL))
 637                         UDRS->track = NEED_2_RECAL;
 638 }
 639 
 640 /* selects the fdc and drive, and enables the fdc's input/dma. */
 641 static void set_fdc(int drive)
     /*  */
 642 {
 643         if (drive >= 0 && drive < N_DRIVE){
 644                 fdc = FDC(drive);
 645                 current_drive = drive;
 646         }
 647         set_dor(fdc,~0,8);
 648 #ifdef CONFIG_FLOPPY_2_FDC
 649         set_dor(1-fdc, ~8, 0);
 650 #endif
 651         if ( FDCS->rawcmd == 2 )
 652                 reset_fdc_info(1);
 653         if( inb_p(FD_STATUS) != STATUS_READY )
 654                 FDCS->reset = 1;
 655 }
 656 
 657 /* locks the driver */
 658 static int lock_fdc(int drive, int interruptible)
     /*  */
 659 {
 660         if(!usage_count){
 661                 printk("trying to lock fdc while usage count=0\n");
 662                 return -1;
 663         }
 664         floppy_grab_irq_and_dma();
 665         if (!current->pid)
 666                 run_task_queue(&tq_timer);
 667         cli();
 668         while (fdc_busy && NO_SIGNAL)
 669                 interruptible_sleep_on(&fdc_wait);
 670         if(fdc_busy){
 671                 sti();
 672                 return -EINTR;
 673         }
 674         fdc_busy = 1;
 675         sti();
 676         command_status = FD_COMMAND_NONE;
 677         set_fdc(drive);
 678         return 0;
 679 }
 680 
 681 #define LOCK_FDC(drive,interruptible) \
 682 if(lock_fdc(drive,interruptible)) return -EINTR;
 683 
 684 typedef void (*timeout_fn)(unsigned long);
 685 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0, 
 686                                                (timeout_fn) floppy_shutdown };
 687 
 688 /* unlocks the driver */
 689 static inline void unlock_fdc(void)
     /*  */
 690 {
 691         if (!fdc_busy)
 692                 DPRINT("FDC access conflict!\n");
 693 
 694         if ( DEVICE_INTR )
 695                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 696                         DEVICE_INTR);
 697         command_status = FD_COMMAND_NONE;
 698         del_timer(&fd_timeout);
 699         fdc_busy = 0;
 700         floppy_release_irq_and_dma();
 701         wake_up(&fdc_wait);
 702 }
 703 
 704 /* switches the motor off after a given timeout */
 705 static void motor_off_callback(unsigned long nr)
     /*  */
 706 {
 707         unsigned char mask = ~(0x10 << UNIT(nr));
 708 
 709         set_dor( FDC(nr), mask, 0 );
 710 }
 711 
 712 static struct timer_list motor_off_timer[N_DRIVE] = {
 713         { NULL, NULL, 0, 0, motor_off_callback },
 714         { NULL, NULL, 0, 1, motor_off_callback },
 715         { NULL, NULL, 0, 2, motor_off_callback },
 716         { NULL, NULL, 0, 3, motor_off_callback }
 717 #ifdef CONFIG_FLOPPY_2_FDC
 718         ,
 719         { NULL, NULL, 0, 4, motor_off_callback },
 720         { NULL, NULL, 0, 5, motor_off_callback },
 721         { NULL, NULL, 0, 6, motor_off_callback },
 722         { NULL, NULL, 0, 7, motor_off_callback }
 723 #endif
 724 };
 725 
 726 /* schedules motor off */
 727 static void floppy_off(unsigned int drive)
     /*  */
 728 {
 729         unsigned long volatile delta;
 730         register int fdc=FDC(drive);
 731 
 732         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 733                 return;
 734 
 735         del_timer(motor_off_timer+drive);
 736 
 737         /* make spindle stop in a position which minimizes spinup time
 738          * next time */
 739         if (UDP->rps ){
 740                 delta = jiffies - UDRS->first_read_date + HZ -
 741                         UDP->spindown_offset;
 742                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 743                 motor_off_timer[drive].expires = UDP->spindown - delta;
 744         }
 745         add_timer(motor_off_timer+drive);
 746 }
 747 
 748 /*
 749  * cycle through all N_DRIVE floppy drives, for disk change testing.
 750  * stopping at current drive. This is done before any long operation, to
 751  * be sure to have up to date disk change information.
 752  */
 753 static void scandrives(void)
     /*  */
 754 {
 755         int i, drive, saved_drive;
 756         
 757         if (DP->select_delay)
 758                 return;
 759 
 760         saved_drive = current_drive;
 761         for(i=0; i< N_DRIVE; i++){
 762                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 763                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 764                         continue; /* skip closed drives */
 765                 set_fdc(drive);
 766                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 767                       (0x10 << UNIT(drive))))
 768                         /* switch the motor off again, if it was off to
 769                          * begin with */
 770                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 771         }
 772         set_fdc(saved_drive);
 773 }
 774 
 775 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 776 
 777 /* this function makes sure that the disk stays in the drive during the
 778  * transfer */
 779 static void fd_watchdog(void)
     /*  */
 780 {
 781 #ifdef DCL_DEBUG
 782         if (DP->flags & FD_DEBUG){
 783                 DPRINT("calling disk change from watchdog\n");
 784         }
 785 #endif
 786 
 787         if ( disk_change(current_drive) ){
 788                 DPRINT("disk removed during i/o\n");
 789                 floppy_shutdown();
 790         } else {                
 791                 del_timer(&fd_timer);
 792                 fd_timer.function = (timeout_fn) fd_watchdog;
 793                 fd_timer.expires = 10;
 794                 add_timer(&fd_timer);
 795         }
 796 }
 797 
 798 static void main_command_interrupt(void)
     /*  */
 799 {
 800         del_timer(&fd_timer);
 801         cont->interrupt();
 802 }
 803 
 804 /* waits for a delay (spinup or select) to pass */
 805 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 806 {
 807         if ( FDCS->reset ){
 808                 reset_fdc(); /* do the reset during sleep to win time
 809                               * if we don't need to sleep, it's a good
 810                               * occasion anyways */
 811                 return 1;
 812         }
 813 
 814         if ( jiffies < delay ){
 815                 del_timer(&fd_timer);
 816                 fd_timer.function = function;
 817                 fd_timer.expires = delay  - jiffies;
 818                 add_timer(&fd_timer);
 819                 return 1;
 820         }
 821         return 0;
 822 }
 823 
 824 static int hlt_disabled=0;
 825 static void floppy_disable_hlt(void)
     /*  */
 826 {
 827         unsigned long flags;
 828         save_flags(flags);
 829         cli();
 830         if(!hlt_disabled){
 831                 hlt_disabled=1;
 832 #ifdef HAVE_DISABLE_HLT
 833                 disable_hlt();
 834 #endif
 835         }
 836         restore_flags(flags);
 837 }
 838 
 839 static void floppy_enable_hlt(void)
     /*  */
 840 {
 841         unsigned long flags;
 842         save_flags(flags);
 843         cli();
 844         if(hlt_disabled){
 845                 hlt_disabled=0;
 846 #ifdef HAVE_DISABLE_HLT
 847                 enable_hlt();
 848 #endif
 849         }
 850         restore_flags(flags);
 851 }
 852                 
 853 
 854 static void setup_DMA(void)
     /*  */
 855 {
 856 #ifdef CONFIG_FLOPPY_SANITY
 857         if ((!CURRENT ||
 858              CURRENT->buffer != current_addr ||
 859              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 860             (current_addr < floppy_track_buffer ||
 861              current_addr + raw_cmd.length >
 862              floppy_track_buffer + 1024 * max_buffer_sectors)){
 863                 printk("bad address. start=%p lg=%lx tb=%p\n",
 864                        current_addr, raw_cmd.length, floppy_track_buffer);
 865                 if ( CURRENT ){
 866                         printk("buffer=%p nr=%lx cnr=%lx\n",
 867                                CURRENT->buffer, CURRENT->nr_sectors,
 868                                CURRENT->current_nr_sectors);
 869                 }
 870                 cont->done(0);
 871                 FDCS->reset=1;
 872                 return;
 873         }
 874         if ((long) current_addr % 512 ){
 875                 printk("non aligned address: %p\n", current_addr );
 876                 cont->done(0);
 877                 FDCS->reset=1;
 878                 return;
 879         }
 880         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 881             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 882                 printk("DMA crossing 64-K boundary %p-%p\n",
 883                        current_addr, current_addr + raw_cmd.length);
 884                 cont->done(0);
 885                 FDCS->reset=1;
 886                 return;
 887         }
 888 
 889 #endif
 890         cli();
 891         disable_dma(FLOPPY_DMA);
 892         clear_dma_ff(FLOPPY_DMA);
 893         set_dma_mode(FLOPPY_DMA,
 894                      (raw_cmd.flags & FD_RAW_READ)?
 895                      DMA_MODE_READ : DMA_MODE_WRITE);
 896         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 897         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 898         enable_dma(FLOPPY_DMA);
 899         sti();
 900         floppy_disable_hlt();
 901 }
 902 
 903 /* sends a command byte to the fdc */
 904 static int output_byte(char byte)
     /*  */
 905 {
 906         int counter;
 907         unsigned char status;
 908 
 909         if (FDCS->reset)
 910                 return -1;
 911         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 912                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 913                 if (!(status & STATUS_READY))
 914                         continue;
 915                 if (status == STATUS_READY){
 916                         outb_p(byte,FD_DATA);
 917                         return 0;
 918                 } else
 919                         break;
 920         }
 921         FDCS->reset = 1;
 922         if ( !initialising )
 923                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
 924                         byte, status);
 925         return -1;
 926 }
 927 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 928 
 929 /* gets the response from the fdc */
 930 static int result(void)
     /*  */
 931 {
 932         int i = 0, counter, status;
 933 
 934         if (FDCS->reset)
 935                 return -1;
 936         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 937                 status = inb_p(FD_STATUS)&
 938                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 939                 if (!(status & STATUS_READY))
 940                         continue;
 941                 if (status == STATUS_READY)
 942                         return i;
 943                 if (status & STATUS_DMA )
 944                         break;
 945                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 946                         if (i >= MAX_REPLIES) {
 947                                 DPRINT("floppy_stat reply overrun\n");
 948                                 break;
 949                         }
 950                         reply_buffer[i++] = inb_p(FD_DATA);
 951                 }
 952         }
 953         FDCS->reset = 1;
 954         if ( !initialising )
 955                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
 956                         status, fdc, i);
 957         return -1;
 958 }
 959 
 960 /* Set perpendicular mode as required, based on data rate, if supported.
 961  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 962  */
 963 static inline void perpendicular_mode(void)
     /*  */
 964 {
 965         unsigned char perp_mode;
 966 
 967         if (!floppy)
 968                 return;
 969         if (floppy->rate & 0x40){
 970                 switch(raw_cmd.rate){
 971                 case 0:
 972                         perp_mode=2;
 973                         break;
 974                 case 3:
 975                         perp_mode=3;
 976                         break;
 977                 default:
 978                         DPRINT("Invalid data rate for perpendicular mode!\n");
 979                         cont->done(0);
 980                         FDCS->reset = 1; /* convenient way to return to
 981                                           * redo without to much hassle (deep
 982                                           * stack et al. */
 983                         return;
 984                 }
 985         } else
 986                 perp_mode = 0;
 987                         
 988         if ( FDCS->perp_mode == perp_mode )
 989                 return;
 990         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 991                 output_byte(FD_PERPENDICULAR);
 992                 output_byte(perp_mode);
 993                 FDCS->perp_mode = perp_mode;
 994         } else if (perp_mode) {
 995                 DPRINT("perpendicular mode not supported by this FDC.\n");
 996         }
 997 } /* perpendicular_mode */
 998 
 999 #define NOMINAL_DTR 500
1000 
1001 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1002  * head load time, and DMA disable flag to values needed by floppy.
1003  *
1004  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1005  * to account for the data rate-based scaling done by the 82072 and 82077
1006  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1007  * 8272a).
1008  *
1009  * Note that changing the data transfer rate has a (probably deleterious)
1010  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1011  * fdc_specify is called again after each data transfer rate
1012  * change.
1013  *
1014  * srt: 1000 to 16000 in microseconds
1015  * hut: 16 to 240 milliseconds
1016  * hlt: 2 to 254 milliseconds
1017  *
1018  * These values are rounded up to the next highest available delay time.
1019  */
1020 static void fdc_specify(void)
     /*  */
1021 {
1022         unsigned char spec1, spec2;
1023         int srt, hlt, hut;
1024         unsigned long dtr = NOMINAL_DTR;
1025         unsigned long scale_dtr = NOMINAL_DTR;
1026         int hlt_max_code = 0x7f;
1027         int hut_max_code = 0xf;
1028 
1029         if (FDCS->need_configure && FDCS->has_fifo) {
1030                 if ( FDCS->reset )
1031                         return;
1032                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1033                 /* TODO: lock this in via LOCK during initialization */
1034                 output_byte(FD_CONFIGURE);
1035                 output_byte(0);
1036                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1037                 output_byte(0);         /* precompensation from track 0 upwards */
1038                 if ( FDCS->reset ){
1039                         FDCS->has_fifo=0;
1040                         return;
1041                 }
1042                 FDCS->need_configure = 0;
1043                 /*DPRINT("FIFO enabled\n");*/
1044         }
1045 
1046         switch (raw_cmd.rate & 0x03) {
1047         case 3:
1048                 dtr = 1000;
1049                 break;
1050         case 1:
1051                 dtr = 300;
1052                 break;
1053         case 2:
1054                 dtr = 250;
1055                 break;
1056         }
1057 
1058         if (FDCS->version >= FDC_82072) {
1059                 scale_dtr = dtr;
1060                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1061                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1062         }
1063 
1064         /* Convert step rate from microseconds to milliseconds and 4 bits */
1065         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1066         if (srt > 0xf)
1067                 srt = 0xf;
1068         else if (srt < 0)
1069                 srt = 0;
1070 
1071         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1072         if (hlt < 0x01)
1073                 hlt = 0x01;
1074         else if (hlt > 0x7f)
1075                 hlt = hlt_max_code;
1076 
1077         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1078         if (hut < 0x1)
1079                 hut = 0x1;
1080         else if (hut > 0xf)
1081                 hut = hut_max_code;
1082 
1083         spec1 = (srt << 4) | hut;
1084         spec2 = (hlt << 1);
1085 
1086         /* If these parameters did not change, just return with success */
1087         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1088                 /* Go ahead and set spec1 and spec2 */
1089                 output_byte(FD_SPECIFY);
1090                 output_byte(FDCS->spec1 = spec1);
1091                 output_byte(FDCS->spec2 = spec2);
1092         }
1093 } /* fdc_specify */
1094 
1095 /* Set the FDC's data transfer rate on behalf of the specified drive.
1096  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1097  * of the specify command (i.e. using the fdc_specify function).
1098  */
1099 static int fdc_dtr(void)
     /*  */
1100 {
1101         /* If data rate not already set to desired value, set it. */
1102         if ( raw_cmd.rate == FDCS->dtr)
1103                 return 0;
1104         
1105         /* Set dtr */
1106         outb_p(raw_cmd.rate, FD_DCR);
1107         
1108         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1109          * need a stabilization period of several milliseconds to be
1110          * enforced after data rate changes before R/W operations.
1111          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1112          */
1113         FDCS->dtr = raw_cmd.rate;
1114         return(wait_for_completion(jiffies+2,
1115                                    (timeout_fn) floppy_ready));
1116 } /* fdc_dtr */
1117 
1118 static void tell_sector(void)
     /*  */
1119 {
1120         printk(": track %d, head %d, sector %d, size %d",
1121                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1122 } /* tell_sector */
1123 
1124 
1125 /*
1126  * Ok, this error interpreting routine is called after a
1127  * DMA read/write has succeeded
1128  * or failed, so we check the results, and copy any buffers.
1129  * hhb: Added better error reporting.
1130  * ak: Made this into a separate routine.
1131  */
1132 static int interpret_errors(void)
     /*  */
1133 {
1134         char bad;
1135 
1136         if (inr!=7) {
1137                 DPRINT("-- FDC reply error");
1138                 FDCS->reset = 1;
1139                 return 1;
1140         }
1141 
1142         /* check IC to find cause of interrupt */
1143         switch ((ST0 & ST0_INTR)>>6) {
1144                 case 1: /* error occurred during command execution */
1145                         bad = 1;
1146                         if (ST1 & ST1_WP) {
1147                                 DPRINT("Drive is write protected\n");
1148                                 CLEARF(FD_DISK_WRITABLE);
1149                                 cont->done(0);
1150                                 bad = 2;
1151                         } else if (ST1 & ST1_ND) {
1152                                 SETF(FD_NEED_TWADDLE);
1153                         } else if (ST1 & ST1_OR) {
1154                                 if (DP->flags & FTD_MSG )
1155                                         DPRINT("Over/Underrun - retrying\n");
1156                                 bad = 0;
1157                         }else if(*errors >= DP->max_errors.reporting){
1158                                 DPRINT("");
1159                                 if (ST0 & ST0_ECE) {
1160                                         printk("Recalibrate failed!");
1161                                 } else if (ST2 & ST2_CRC) {
1162                                         printk("data CRC error");
1163                                         tell_sector();
1164                                 } else if (ST1 & ST1_CRC) {
1165                                         printk("CRC error");
1166                                         tell_sector();
1167                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1168                                         if (!probing) {
1169                                                 printk("sector not found");
1170                                                 tell_sector();
1171                                         } else
1172                                                 printk("probe failed...");
1173                                 } else if (ST2 & ST2_WC) {      /* seek error */
1174                                         printk("wrong cylinder");
1175                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1176                                         printk("bad cylinder");
1177                                 } else {
1178                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1179                                         tell_sector();
1180                                 }
1181                                 printk("\n");
1182 
1183                         }
1184                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1185                                 /* wrong cylinder => recal */
1186                                 DRS->track = NEED_2_RECAL;
1187                         return bad;
1188                 case 2: /* invalid command given */
1189                         DPRINT("Invalid FDC command given!\n");
1190                         cont->done(0);
1191                         return 2;
1192                 case 3:
1193                         DPRINT("Abnormal termination caused by polling\n");
1194                         cont->error();
1195                         return 2;
1196                 default: /* (0) Normal command termination */
1197                         return 0;
1198         }
1199 }
1200 
1201 /*
1202  * This routine is called when everything should be correctly set up
1203  * for the transfer (ie floppy motor is on, the correct floppy is
1204  * selected, and the head is sitting on the right track).
1205  */
1206 static void setup_rw_floppy(void)
     /*  */
1207 {
1208         int i,ready_date,r, flags,dflags;
1209         timeout_fn function;
1210 
1211         flags = raw_cmd.flags;
1212         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1213                 flags |= FD_RAW_INTR;
1214 
1215         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1216                 ready_date = DRS->spinup_date + DP->spinup;             
1217                 /* If spinup will take a long time, rerun scandrives
1218                  * again just before spinup completion. Beware that
1219                  * after scandrives, we must again wait for selection.
1220                  */
1221                 if ( ready_date > jiffies + DP->select_delay){
1222                         ready_date -= DP->select_delay;
1223                         function = (timeout_fn) floppy_start;
1224                 } else
1225                         function = (timeout_fn) setup_rw_floppy;
1226 
1227                 /* wait until the floppy is spinning fast enough */
1228                 if (wait_for_completion(ready_date,function))
1229                         return;
1230         }
1231         dflags = DRS->flags;
1232 
1233         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1234                 setup_DMA();
1235         
1236         if ( flags & FD_RAW_INTR )
1237                 SET_INTR(main_command_interrupt);
1238 
1239         r=0;
1240         for(i=0; i< raw_cmd.cmd_count; i++)
1241                 r|=output_byte( raw_cmd.cmd[i] );
1242 
1243 #ifdef DEBUGT
1244         debugt("rw_command: ");
1245 #endif
1246         if ( r ){
1247                 reset_fdc();
1248                 return;
1249         }
1250 
1251         if ( ! ( flags & FD_RAW_INTR )){
1252                 inr = result();
1253                 cont->interrupt();
1254         } else if ( flags & FD_RAW_NEED_DISK )
1255                 fd_watchdog();
1256 }
1257 
1258 static int blind_seek;
1259 
1260 /*
1261  * This is the routine called after every seek (or recalibrate) interrupt
1262  * from the floppy controller.
1263  */
1264 static void seek_interrupt(void)
     /*  */
1265 {
1266 #ifdef DEBUGT
1267         debugt("seek interrupt:");
1268 #endif
1269         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1270                 DPRINT("seek failed\n");
1271                 DRS->track = NEED_2_RECAL;
1272                 cont->error();
1273                 cont->redo();
1274                 return;
1275         }
1276         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1277 #ifdef DCL_DEBUG
1278                 if (DP->flags & FD_DEBUG){
1279                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1280                         DPRINT1("jiffies=%ld\n", jiffies);
1281                 }
1282 #endif
1283                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1284                 DRS->select_date = jiffies;
1285         }
1286         DRS->track = ST1;
1287         floppy_ready();
1288 }
1289 
1290 static void check_wp(void)
     /*  */
1291 {
1292         if (TESTF(FD_VERIFY)) {
1293                 /* check write protection */
1294                 output_byte( FD_GETSTATUS );
1295                 output_byte( UNIT(current_drive) );
1296                 if ( result() != 1 ){
1297                         FDCS->reset = 1;
1298                         return;
1299                 }
1300                 CLEARF(FD_VERIFY);
1301                 CLEARF(FD_NEED_TWADDLE);
1302 #ifdef DCL_DEBUG
1303                 if (DP->flags & FD_DEBUG){
1304                         DPRINT("checking whether disk is write protected\n");
1305                         DPRINT1("wp=%x\n",ST3 & 0x40);
1306                 }
1307 #endif
1308                 if (!( ST3  & 0x40))
1309                         SETF(FD_DISK_WRITABLE);
1310                 else
1311                         CLEARF(FD_DISK_WRITABLE);
1312         }
1313 }
1314 
1315 static void seek_floppy(void)
     /*  */
1316 {
1317         int track;
1318 
1319         blind_seek=0;
1320 
1321 #ifdef DCL_DEBUG
1322         if (DP->flags & FD_DEBUG){
1323                 DPRINT("calling disk change from seek\n");
1324         }
1325 #endif
1326 
1327         if (!TESTF(FD_DISK_NEWCHANGE) &&
1328             disk_change(current_drive) &&
1329             (raw_cmd.flags & FD_RAW_NEED_DISK)){
1330                 /* the media changed flag should be cleared after the seek.
1331                  * If it isn't, this means that there is really no disk in
1332                  * the drive.
1333                  */
1334                 SETF(FD_DISK_CHANGED);
1335                 cont->done(0);
1336                 cont->redo();
1337                 return;
1338         }
1339         if ( DRS->track <= NEED_1_RECAL ){
1340                 recalibrate_floppy();
1341                 return;
1342         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1343                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1344                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1345                 /* we seek to clear the media-changed condition. Does anybody
1346                  * know a more elegant way, which works on all drives? */
1347                 if ( raw_cmd.track )
1348                         track = raw_cmd.track - 1;
1349                 else {
1350                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1351                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1352                                 blind_seek = 1;
1353                                 raw_cmd.flags |= FD_RAW_NEED_SEEK;
1354                         }
1355                         track = 1;
1356                 }
1357         } else {
1358                 check_wp();
1359                 if (raw_cmd.track != DRS->track &&
1360                     (raw_cmd.flags & FD_RAW_NEED_SEEK))
1361                         track = raw_cmd.track;
1362                 else {
1363                         setup_rw_floppy();
1364                         return;
1365                 }
1366         }
1367 
1368         SET_INTR(seek_interrupt);
1369         output_byte(FD_SEEK);
1370         output_byte(UNIT(current_drive));
1371         LAST_OUT(track);
1372 #ifdef DEBUGT
1373         debugt("seek command:");
1374 #endif
1375 }
1376 
1377 static void recal_interrupt(void)
     /*  */
1378 {
1379 #ifdef DEBUGT
1380         debugt("recal interrupt:");
1381 #endif
1382         if (inr !=2 )
1383                 FDCS->reset = 1;
1384         else if (ST0 & ST0_ECE) {
1385                 switch(DRS->track){
1386                 case NEED_1_RECAL:
1387 #ifdef DEBUGT
1388                         debugt("recal interrupt need 1 recal:");
1389 #endif
1390                         /* after a second recalibrate, we still haven't
1391                          * reached track 0. Probably no drive. Raise an
1392                          * error, as failing immediately might upset 
1393                          * computers possessed by the Devil :-) */
1394                         cont->error();
1395                         cont->redo();
1396                         return;
1397                 case NEED_2_RECAL:
1398 #ifdef DEBUGT
1399                         debugt("recal interrupt need 2 recal:");
1400 #endif
1401                         /* If we already did a recalibrate, and we are not at
1402                          * track 0, this means we have moved. (The only way
1403                          * not to move at recalibration is to be already at
1404                          * track 0.) Clear the new change flag
1405                          */
1406 #ifdef DCL_DEBUG
1407                         if (DP->flags & FD_DEBUG){
1408                                 DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1409                         }
1410 #endif
1411 
1412                         CLEARF(FD_DISK_NEWCHANGE);
1413                         DRS->select_date = jiffies;
1414                         /* fall through */
1415                 default:
1416 #ifdef DEBUGT
1417                         debugt("recal interrupt default:");
1418 #endif
1419                         /* Recalibrate moves the head by at most 80 steps. If
1420                          * after one recalibrate we don't have reached track
1421                          * 0, this might mean that we started beyond track 80.
1422                          * Try again.
1423                          */
1424                         DRS->track = NEED_1_RECAL;
1425                         break;
1426                 }
1427         } else
1428                 DRS->track = ST1;
1429         floppy_ready();
1430 }
1431 
1432 /*
1433  * Unexpected interrupt - Print as much debugging info as we can...
1434  * All bets are off...
1435  */
1436 static void unexpected_floppy_interrupt(void)
     /*  */
1437 {
1438         int i;
1439         if ( initialising )
1440                 return;
1441         DPRINT("unexpected interrupt\n");
1442         if ( inr >= 0 )
1443                 for(i=0; i<inr; i++)
1444                         printk("%d %x\n", i, reply_buffer[i] );
1445         while(1){
1446                 output_byte(FD_SENSEI);
1447                 inr=result();
1448                 if ( inr != 2 )
1449                         break;
1450                 printk("sensei\n");
1451                 for(i=0; i<inr; i++)
1452                         printk("%d %x\n", i, reply_buffer[i] );
1453         }
1454         FDCS->reset = 1;
1455 }
1456 
1457 struct tq_struct floppy_tq = 
1458 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1459 
1460 /* interrupt handler */
1461 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1462 {
1463         void (*handler)(void) = DEVICE_INTR;
1464 
1465         floppy_enable_hlt();
1466         CLEAR_INTR;
1467         if ( fdc >= N_FDC || FDCS->address == -1){
1468                 /* we don't even know which FDC is the culprit */
1469                 printk("DOR0=%x\n", fdc_state[0].dor);
1470                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1471                 printk("handler=%p\n", handler);
1472                 return;
1473         }
1474         inr = result();
1475         if (!handler){
1476                 unexpected_floppy_interrupt();
1477                 return;
1478         }
1479         if ( inr == 0 ){
1480                 do {
1481                         output_byte(FD_SENSEI);
1482                         inr = result();
1483                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1484         }
1485         floppy_tq.routine = (void *)(void *) handler;
1486         queue_task_irq(&floppy_tq, &tq_timer);
1487 }
1488 
1489 static void recalibrate_floppy(void)
     /*  */
1490 {
1491 #ifdef DEBUGT
1492         debugt("recalibrate floppy:");
1493 #endif
1494         SET_INTR(recal_interrupt);
1495         output_byte(FD_RECALIBRATE);
1496         LAST_OUT(UNIT(current_drive));
1497 }
1498 
1499 /*
1500  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1501  */
1502 static void reset_interrupt(void)
     /*  */
1503 {
1504 #ifdef DEBUGT
1505         debugt("reset interrupt:");
1506 #endif
1507         fdc_specify();          /* reprogram fdc */
1508         result();               /* get the status ready for set_fdc */
1509         if ( FDCS->reset )
1510                 cont->error(); /* a reset just after a reset. BAD! */
1511         cont->redo();
1512 }
1513 
1514 /*
1515  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1516  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1517  */
1518 static void reset_fdc(void)
     /*  */
1519 {
1520         SET_INTR(reset_interrupt);
1521         FDCS->reset = 0;
1522         reset_fdc_info(0);
1523         if ( FDCS->version >= FDC_82077 )
1524                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1525         else {
1526                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1527                 udelay(FD_RESET_DELAY);
1528                 outb(FDCS->dor, FD_DOR);
1529         }
1530 }
1531 
1532 static void empty(void)
     /*  */
1533 {
1534 }
1535 
1536 void show_floppy(void)
     /*  */
1537 {
1538         int i;
1539 
1540         printk("\n");
1541         printk("floppy driver state\n");
1542         printk("-------------------\n");
1543         for(i=0; i<N_FDC; i++){
1544                 if(FDCS->address != -1){
1545                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1546                         outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1547                         udelay(1000); /* maybe we'll catch an interrupt... */
1548                 }
1549         }
1550         printk("status=%x\n", inb_p(FD_STATUS));
1551         printk("fdc_busy=%d\n", fdc_busy);
1552         if( DEVICE_INTR)
1553                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1554         if(floppy_tq.sync)
1555                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1556         if(fd_timer.prev)
1557                 printk("fd_timer.function=%p\n", fd_timer.function);
1558         if(fd_timeout.prev){
1559                 printk("timer_table=%p\n",fd_timeout.function);
1560                 printk("expires=%ld\n",fd_timeout.expires);
1561                 printk("now=%ld\n",jiffies);
1562         }
1563         printk("cont=%p\n", cont);
1564         printk("CURRENT=%p\n", CURRENT);
1565         printk("command_status=%d\n", command_status);
1566         printk("\n");
1567 }
1568 
1569 static void floppy_shutdown(void)
     /*  */
1570 {
1571         CLEAR_INTR;
1572         floppy_tq.routine = (void *)(void *) empty;
1573         del_timer( &fd_timer);
1574 
1575         floppy_enable_hlt();
1576         disable_dma(FLOPPY_DMA);
1577         /* avoid dma going to a random drive after shutdown */
1578 
1579         if(!initialising)
1580                 DPRINT("floppy timeout\n");
1581         FDCS->reset = 1;
1582         cont->done(0);
1583         cont->redo(); /* this will recall reset when needed */
1584 }
1585 /*typedef void (*timeout_fn)(unsigned long);*/
1586 
1587 /* start motor, check media-changed condition and write protection */
1588 static int start_motor( void (*function)(void)  )
     /*  */
1589 {
1590         int mask, data;
1591 
1592         mask = 0xfc;
1593         data = UNIT(current_drive);
1594         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1595                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1596                         set_debugt();
1597                         /* no read since this drive is running */
1598                         DRS->first_read_date = 0;
1599                         /* note motor start time if motor is not yet running */
1600                         DRS->spinup_date = jiffies;
1601                         data |= (0x10 << UNIT(current_drive));
1602                 }
1603         } else
1604                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1605                         mask &= ~(0x10 << UNIT(current_drive));
1606 
1607         /* starts motor and selects floppy */
1608         del_timer(motor_off_timer + current_drive);
1609         set_dor( fdc, mask, data);
1610 
1611         /* wait_for_completion also schedules reset if needed. */
1612         return(wait_for_completion(DRS->select_date+DP->select_delay,
1613                                    (timeout_fn) function));
1614 }
1615 
1616 static void floppy_ready(void)
     /*  */
1617 {
1618         CHECK_RESET;
1619         if(start_motor(floppy_ready)) return;
1620         if(fdc_dtr()) return;
1621 
1622 #ifdef DCL_DEBUG
1623         if (DP->flags & FD_DEBUG){
1624                 DPRINT("calling disk change from floppy_ready\n");
1625         }
1626 #endif
1627 
1628         if(!(raw_cmd.flags & FD_RAW_NO_MOTOR) &&
1629            disk_change(current_drive) &&
1630            !DP->select_delay)
1631                 twaddle(); /* this clears the dcl on certain drive/controller
1632                             * combinations */
1633 
1634         if ( raw_cmd.flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1635                 perpendicular_mode();
1636                 fdc_specify(); /* must be done here because of hut, hlt ... */
1637                 seek_floppy();
1638         } else
1639                 setup_rw_floppy();
1640 }
1641 
1642 static void floppy_start(void)
     /*  */
1643 {
1644         del_timer(&fd_timeout);
1645         fd_timeout.expires = DP->timeout;
1646         add_timer(&fd_timeout);
1647 
1648         scandrives();
1649 #ifdef DCL_DEBUG
1650                 if (DP->flags & FD_DEBUG){
1651                         DPRINT("setting NEWCHANGE in floppy_start\n");
1652                 }
1653 #endif
1654         SETF(FD_DISK_NEWCHANGE);
1655         floppy_ready();
1656 }
1657 
1658 /*
1659  * ========================================================================
1660  * here ends the bottom half. Exported routines are:
1661   * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1662  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1663  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1664  * and set_dor.
1665  * ========================================================================
1666  */
1667 /*
1668  * General purpose continuations.
1669  * ==============================
1670  */
1671 
1672 static void do_wakeup(void)
     /*  */
1673 {
1674         del_timer(&fd_timeout);
1675         cont = 0;
1676         command_status += 2;
1677         wake_up(&command_done);
1678 }
1679 
1680 static struct cont_t wakeup_cont={
1681         empty,
1682         do_wakeup,
1683         empty,
1684         (done_f)empty
1685 };
1686 
1687 static int wait_til_done( void (*handler)(void ), int interruptible )
     /*  */
1688 {
1689         int ret;
1690 
1691         floppy_tq.routine = (void *)(void *) handler;
1692         queue_task(&floppy_tq, &tq_timer);
1693 
1694         cli();
1695         while(command_status < 2 && NO_SIGNAL)
1696                 if (current->pid)
1697                         interruptible_sleep_on(&command_done);
1698                 else {
1699                         sti();
1700                         run_task_queue(&tq_timer);
1701                         cli();
1702                 }
1703         if(command_status < 2){
1704                 sti();
1705                 floppy_shutdown();
1706                 process_fd_request();
1707                 return -EINTR;
1708         }
1709         sti();
1710 
1711         if ( FDCS->reset )
1712                 command_status = FD_COMMAND_ERROR;
1713         if ( command_status == FD_COMMAND_OKAY )
1714                 ret=0;
1715         else
1716                 ret=-EIO;
1717         command_status = FD_COMMAND_NONE;
1718         return ret;
1719 }
1720 
1721 static void generic_done(int result)
     /*  */
1722 {
1723         command_status = result;
1724         cont = &wakeup_cont;
1725 }
1726 
1727 static void generic_success(void)
     /*  */
1728 {
1729         generic_done(1);
1730 }
1731 
1732 static void generic_failure(void)
     /*  */
1733 {
1734         generic_done(0);
1735 }
1736 
1737 static void success_and_wakeup(void)
     /*  */
1738 {
1739         generic_success();
1740         do_wakeup();
1741 }
1742 
1743 static void failure_and_wakeup(void)
     /*  */
1744 {
1745         generic_failure();
1746         do_wakeup();
1747 }
1748 
1749 /*
1750  * formatting and rw support.
1751  * ==========================
1752  */
1753 
1754 static int next_valid_format(void)
     /*  */
1755 {
1756         int probed_format;
1757 
1758         probed_format = DRS->probed_format;
1759         while(1){
1760                 if ( probed_format >= 8 ||
1761                     ! DP->autodetect[probed_format] ){
1762                         DRS->probed_format = 0;
1763                         return 1;
1764                 }
1765                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1766                         DRS->probed_format = probed_format;
1767                         return 0;
1768                 }
1769                 probed_format++;
1770         }
1771 }
1772 
1773 static void bad_flp_intr(void)
     /*  */
1774 {
1775         if ( probing ){
1776                 DRS->probed_format++;
1777                 if ( !next_valid_format())
1778                         return;
1779         }
1780         (*errors)++;
1781         if (*errors > DRWE->badness)
1782                 DRWE->badness = *errors;
1783         if (*errors > DP->max_errors.abort)
1784                 cont->done(0);
1785         if (*errors > DP->max_errors.reset)
1786                 FDCS->reset = 1;
1787         else if (*errors > DP->max_errors.recal)
1788                 DRS->track = NEED_2_RECAL;
1789 }
1790 
1791 static void set_floppy(int device)
     /*  */
1792 {
1793         if (TYPE(device))
1794                 floppy = TYPE(device) + floppy_type;
1795         else
1796                 floppy = current_type[ DRIVE(device) ];
1797 }
1798 
1799 /*
1800  * formatting and support.
1801  * =======================
1802  */
1803 static void format_interrupt(void)
     /*  */
1804 {
1805         switch (interpret_errors()){
1806         case 1:
1807                 cont->error();
1808         case 2:
1809                 break;
1810         case 0:
1811                 cont->done(1);
1812         }
1813         cont->redo();
1814 }
1815 
1816 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
1817 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
1818 #define CT(x) ( (x) | 0x40 )
1819 static void setup_format_params(void)
     /*  */
1820 {
1821         struct fparm {
1822                 unsigned char track,head,sect,size;
1823         } *here = (struct fparm *)floppy_track_buffer;
1824         int il,n;
1825         int count,head_shift,track_shift;
1826 
1827         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1828                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1829         raw_cmd.rate = floppy->rate & 0x3;
1830         raw_cmd.cmd_count = NR_F;
1831         COMMAND = FM_MODE(floppy,FD_FORMAT);
1832         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1833         F_SIZECODE = FD_SIZECODE(floppy);
1834         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1835         F_GAP = floppy->fmt_gap;
1836         F_FILL = FD_FILL_BYTE;
1837 
1838         current_addr = floppy_track_buffer;
1839         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1840 
1841         /* allow for about 30ms for data transport per track */
1842         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1843 
1844         /* a ``cylinder'' is two tracks plus a little stepping time */
1845         track_shift = 2 * head_shift + 1;
1846 
1847         /* position of logical sector 1 on this track */
1848         n = (track_shift * format_req.track + head_shift * format_req.head )
1849                 % F_SECT_PER_TRACK;
1850 
1851         /* determine interleave */
1852         il = 1;
1853         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
1854                 il++;
1855 
1856         /* initialize field */
1857         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1858                 here[count].track = format_req.track;
1859                 here[count].head = format_req.head;
1860                 here[count].sect = 0;
1861                 here[count].size = F_SIZECODE;
1862         }
1863         /* place logical sectors */
1864         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1865                 here[n].sect = count;
1866                 n = (n+il) % F_SECT_PER_TRACK;
1867                 if (here[n].sect) { /* sector busy, find next free sector */
1868                         ++n;
1869                         if (n>= F_SECT_PER_TRACK) {
1870                                 n-=F_SECT_PER_TRACK;
1871                                 while (here[n].sect) ++n;
1872                         }
1873                 }
1874         }
1875 }
1876 
1877 static void redo_format(void)
     /*  */
1878 {
1879         raw_cmd.track = format_req.track << floppy->stretch;
1880         buffer_track = -1;
1881         setup_format_params();
1882         floppy_start();
1883 #ifdef DEBUGT
1884         debugt("queue format request");
1885 #endif
1886 }
1887 
1888 static struct cont_t format_cont={
1889         format_interrupt,
1890         redo_format,
1891         bad_flp_intr,
1892         generic_done };
1893 
1894 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1895 {
1896         int ret;
1897         int drive=DRIVE(device);
1898 
1899         LOCK_FDC(drive,1);
1900         set_floppy(device);
1901         if (!floppy ||
1902             floppy->track > DP->tracks ||
1903             tmp_format_req->track >= floppy->track ||
1904             tmp_format_req->head >= floppy->head ||
1905             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
1906             !floppy->fmt_gap) {
1907                 process_fd_request();
1908                 return -EINVAL;
1909         }
1910         format_req = *tmp_format_req;
1911         format_errors = 0;
1912         cont = &format_cont;
1913         errors = &format_errors;
1914         IWAIT(redo_format);
1915         process_fd_request();
1916         return ret;
1917 }
1918 
1919 /*
1920  * Buffer read/write and support
1921  * =============================
1922  */
1923 
1924 /* new request_done. Can handle physical sectors which are smaller than a
1925  * logical buffer */
1926 static void request_done(int uptodate)
     /*  */
1927 {
1928         int block;
1929 
1930         probing = 0;
1931         del_timer(&fd_timeout);
1932 
1933         if (!CURRENT){
1934                 DPRINT("request list destroyed in floppy request done\n");
1935                 return;
1936         }
1937         if (uptodate){
1938                 /* maintain values for invalidation on geometry
1939                    change */
1940                 block = current_count_sectors + CURRENT->sector;
1941                 if (block > DRS->maxblock)
1942                         DRS->maxblock=block;
1943                 if ( block > floppy->sect)
1944                         DRS->maxtrack = 1;
1945 
1946                 /* unlock chained buffers */
1947                 while (current_count_sectors && CURRENT &&
1948                        current_count_sectors >= CURRENT->current_nr_sectors ){
1949                         current_count_sectors -= CURRENT->current_nr_sectors;
1950                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1951                         CURRENT->sector += CURRENT->current_nr_sectors;
1952                         end_request(1);
1953                 }
1954                 if ( current_count_sectors && CURRENT){
1955                         /* "unlock" last subsector */
1956                         CURRENT->buffer += current_count_sectors <<9;
1957                         CURRENT->current_nr_sectors -= current_count_sectors;
1958                         CURRENT->nr_sectors -= current_count_sectors;
1959                         CURRENT->sector += current_count_sectors;
1960                         return;
1961                 }
1962 
1963                 if ( current_count_sectors && ! CURRENT )
1964                         DPRINT("request list destroyed in floppy request done\n");
1965 
1966         } else {
1967                 if(CURRENT->cmd == WRITE) {
1968                         /* record write error information */
1969                         DRWE->write_errors++;
1970                         if(DRWE->write_errors == 1) {
1971                                 DRWE->first_error_sector = CURRENT->sector;
1972                                 DRWE->first_error_generation = DRS->generation;
1973                         }
1974                         DRWE->last_error_sector = CURRENT->sector;
1975                         DRWE->last_error_generation = DRS->generation;
1976                 }
1977                 end_request(0);
1978         }
1979 }
1980 
1981 /* Interrupt handler evaluating the result of the r/w operation */
1982 static void rw_interrupt(void)
     /*  */
1983 {
1984         int nr_sectors, ssize;
1985 
1986         if ( ! DRS->first_read_date )
1987                 DRS->first_read_date = jiffies;
1988 
1989         nr_sectors = 0;
1990         CODE2SIZE;
1991         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1992                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
1993                         (sector_t % floppy->sect) % ssize;
1994 
1995 #ifdef CONFIG_FLOPPY_SANITY
1996         if ( nr_sectors > current_count_sectors + ssize -
1997             (current_count_sectors + sector_t) % ssize +
1998             sector_t % ssize){
1999                 DPRINT2("long rw: %x instead of %lx\n",
2000                         nr_sectors, current_count_sectors);
2001                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2002                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2003                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2004                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2005                        sector_t, ssize);
2006         }
2007 #endif
2008         if ( nr_sectors < 0 )
2009                 nr_sectors = 0;
2010         if ( nr_sectors < current_count_sectors )
2011                 current_count_sectors = nr_sectors;
2012 
2013         switch (interpret_errors()){
2014         case 2:
2015                 cont->redo();
2016                 return;
2017         case 1:
2018                 if (  !current_count_sectors){
2019                         cont->error();
2020                         cont->redo();
2021                         return;
2022                 }
2023                 break;
2024         case 0:
2025                 if (  !current_count_sectors){
2026                         cont->redo();
2027                         return;
2028                 }
2029                 current_type[current_drive] = floppy;
2030                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
2031                         floppy->size >> 1;
2032                 break;
2033         }
2034 
2035         if (probing) {
2036                 if (DP->flags & FTD_MSG)
2037                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2038                                 floppy->name,current_drive);
2039                 current_type[current_drive] = floppy;
2040                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
2041                         floppy->size >> 1;
2042                 probing = 0;
2043         }
2044 
2045         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
2046                 /* transfer directly from buffer */
2047                 cont->done(1);
2048         } else if ( CT(COMMAND) == FD_READ){
2049                 buffer_track = raw_cmd.track;
2050                 buffer_drive = current_drive;
2051                 if ( nr_sectors + sector_t > buffer_max )
2052                         buffer_max = nr_sectors + sector_t;
2053         }
2054         cont->redo();
2055 }
2056 
2057 /* Compute maximal contiguous buffer size. */
2058 static int buffer_chain_size(void)
     /*  */
2059 {
2060         struct buffer_head *bh;
2061         int size;
2062         char *base;
2063 
2064         base = CURRENT->buffer;
2065         size = CURRENT->current_nr_sectors << 9;
2066         bh = CURRENT->bh;
2067 
2068         if (bh){
2069                 bh = bh->b_reqnext;
2070                 while ( bh && bh->b_data == base + size ){
2071                         size += bh->b_size;
2072                         bh = bh->b_reqnext;
2073                 }
2074         }
2075         return size >> 9;
2076 }
2077 
2078 /* Compute the maximal transfer size */
2079 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2080 {
2081         if ( max_sector > sector_t + max_size)
2082                 max_sector = sector_t + max_size;
2083 
2084         /* alignment */
2085         max_sector -= (max_sector % floppy->sect ) % ssize;
2086 
2087         /* transfer size, beginning not aligned */
2088         current_count_sectors = max_sector - sector_t ;
2089 
2090         return max_sector;
2091 }
2092 
2093 /*
2094  * Move data from/to the track buffer to/from the buffer cache.
2095  */
2096 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2097 {
2098         int remaining; /* number of transferred 512-byte sectors */
2099         struct buffer_head *bh;
2100         char *buffer, *dma_buffer;
2101         int size;
2102 
2103         if ( max_sector > max_sector_2 )
2104                 max_sector = max_sector_2;
2105 
2106         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2107 
2108         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2109             buffer_max > sector_t + CURRENT->nr_sectors){
2110                 current_count_sectors = buffer_max - sector_t;
2111                 if ( current_count_sectors > CURRENT->nr_sectors )
2112                         current_count_sectors = CURRENT->nr_sectors;
2113         }
2114         remaining = current_count_sectors << 9;
2115 #ifdef CONFIG_FLOPPY_SANITY
2116         if ((remaining >> 9) > CURRENT->nr_sectors  && 
2117             CT(COMMAND) == FD_WRITE ){
2118                 DPRINT("in copy buffer\n");
2119                 printk("current_count_sectors=%ld\n", current_count_sectors);
2120                 printk("remaining=%d\n", remaining >> 9);
2121                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2122                 printk("CURRENT->current_nr_sectors=%ld\n",
2123                        CURRENT->current_nr_sectors);
2124                 printk("max_sector=%d\n", max_sector);
2125                 printk("ssize=%d\n", ssize);
2126         }
2127 #endif
2128 
2129         if ( max_sector > buffer_max )
2130                 buffer_max = max_sector;
2131 
2132         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2133 
2134         bh = CURRENT->bh;
2135         size = CURRENT->current_nr_sectors << 9;
2136         buffer = CURRENT->buffer;
2137 
2138         while ( remaining > 0){
2139                 if ( size > remaining )
2140                         size = remaining;
2141 #ifdef CONFIG_FLOPPY_SANITY
2142                 if (dma_buffer + size >
2143                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2144                     dma_buffer < floppy_track_buffer ){
2145                         DPRINT1("buffer overrun in copy buffer %d\n",
2146                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2147                         printk("sector_t=%d buffer_min=%d\n",
2148                                sector_t, buffer_min);
2149                         printk("current_count_sectors=%ld\n",
2150                                current_count_sectors);
2151                         if ( CT(COMMAND) == FD_READ )
2152                                 printk("read\n");
2153                         if ( CT(COMMAND) == FD_READ )
2154                                 printk("write\n");
2155                         break;
2156                 }
2157                 if ( ((unsigned long)buffer) % 512 )
2158                         DPRINT1("%p buffer not aligned\n", buffer);
2159 #endif
2160                 if ( CT(COMMAND) == FD_READ )
2161                         memcpy( buffer, dma_buffer, size);
2162                 else
2163                         memcpy( dma_buffer, buffer, size);
2164                 remaining -= size;
2165                 if ( !remaining)
2166                         break;
2167 
2168                 dma_buffer += size;
2169                 bh = bh->b_reqnext;
2170 #ifdef CONFIG_FLOPPY_SANITY
2171                 if ( !bh){
2172                         DPRINT("bh=null in copy buffer after copy\n");
2173                         break;
2174                 }
2175 #endif
2176                 size = bh->b_size;
2177                 buffer = bh->b_data;
2178         }
2179 #ifdef CONFIG_FLOPPY_SANITY
2180         if ( remaining ){
2181                 if ( remaining > 0 )
2182                         max_sector -= remaining >> 9;
2183                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2184         }
2185 #endif
2186 }
2187 
2188 /*
2189  * Formulate a read/write request.
2190  * this routine decides where to load the data (directly to buffer, or to
2191  * tmp floppy area), how much data to load (the size of the buffer, the whole
2192  * track, or a single sector)
2193  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2194  * allocation on the fly, it should be done here. No other part should need
2195  * modification.
2196  */
2197 
2198 static int make_raw_rw_request(void)
     /*  */
2199 {
2200         int aligned_sector_t;
2201         int max_sector, max_size, tracksize, ssize;
2202 
2203         set_fdc(DRIVE(CURRENT->dev));
2204 
2205         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2206                 FD_RAW_NEED_SEEK;
2207         raw_cmd.cmd_count = NR_RW;
2208         if (CURRENT->cmd == READ){
2209                 raw_cmd.flags |= FD_RAW_READ;
2210                 COMMAND = FM_MODE(floppy,FD_READ);
2211         } else if (CURRENT->cmd == WRITE){
2212                 raw_cmd.flags |= FD_RAW_WRITE;
2213                 COMMAND = FM_MODE(floppy,FD_WRITE);
2214         } else {
2215                 DPRINT("make_raw_rw_request: unknown command\n");
2216                 return 0;
2217         }
2218 
2219         max_sector = floppy->sect * floppy->head;
2220         TRACK = CURRENT->sector / max_sector;
2221         sector_t = CURRENT->sector % max_sector;
2222         if ( floppy->track && TRACK >= floppy->track )
2223                 return 0;
2224         HEAD = sector_t / floppy->sect;
2225 
2226         if ( TESTF( FD_NEED_TWADDLE) && sector_t < floppy->sect )
2227                 max_sector = floppy->sect;
2228 
2229         /* 2M disks have phantom sectors on the first track */
2230         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2231                 max_sector = 2 * floppy->sect / 3;
2232                 if (sector_t >= max_sector){
2233                         current_count_sectors =  (floppy->sect - sector_t);
2234                         if ( current_count_sectors > CURRENT->nr_sectors )
2235                                 current_count_sectors = CURRENT->nr_sectors;
2236                         return 1;
2237                 }
2238                 SIZECODE = 2;
2239         } else
2240                 SIZECODE = FD_SIZECODE(floppy);
2241         raw_cmd.rate = floppy->rate & 3;
2242         if ((floppy->rate & FD_2M) &&
2243             (TRACK || HEAD ) &&
2244             raw_cmd.rate == 2)
2245                 raw_cmd.rate = 1;
2246 
2247         if ( SIZECODE )
2248                 SIZECODE2 = 0xff;
2249         else
2250                 SIZECODE2 = 0x80;
2251         raw_cmd.track = TRACK << floppy->stretch;
2252         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
2253         GAP = floppy->gap;
2254         CODE2SIZE;
2255         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2256         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2257         tracksize = floppy->sect - floppy->sect % ssize;
2258         if ( tracksize < floppy->sect ){
2259                 SECT_PER_TRACK ++;
2260                 if (  tracksize <= sector_t % floppy->sect)
2261                         SECTOR--;
2262                 while ( tracksize <= sector_t % floppy->sect){
2263                         while( tracksize + ssize > floppy->sect ){
2264                                 SIZECODE--;
2265                                 ssize >>= 1;
2266                         }
2267                         SECTOR++; SECT_PER_TRACK ++;
2268                         tracksize += ssize;
2269                 }
2270                 max_sector = HEAD * floppy->sect + tracksize;
2271         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2272                 max_sector = floppy->sect;
2273 
2274         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2275         max_size = CURRENT->nr_sectors;
2276         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2277             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2278                 /* data already in track buffer */
2279                 if (CT(COMMAND) == FD_READ) {
2280                         copy_buffer(1, max_sector, buffer_max);
2281                         return 1;
2282                 }
2283         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2284                 if (CT(COMMAND) == FD_WRITE){
2285                         if(sector_t + CURRENT->nr_sectors > ssize &&
2286                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2287                                 max_size = ssize + ssize;
2288                         else
2289                                 max_size = ssize;
2290                 }
2291                 raw_cmd.flags &= ~FD_RAW_WRITE;
2292                 raw_cmd.flags |= FD_RAW_READ;
2293                 COMMAND = FM_MODE(floppy,FD_READ);
2294         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2295                 int direct, indirect;
2296 
2297                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2298                         sector_t;
2299 
2300                 max_size = buffer_chain_size();
2301                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2302                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2303                 /* 64 kb boundaries */
2304                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2305                      ((long) CURRENT->buffer ) / K_64 )
2306                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2307                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2308                 /*
2309                  * We try to read tracks, but if we get too many errors, we
2310                  * go back to reading just one sector at a time.
2311                  *
2312                  * This means we should be able to read a sector even if there
2313                  * are other bad sectors on this track.
2314                  */
2315                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2316                     *errors < DP->max_errors.read_track &&
2317                     /*!TESTF( FD_NEED_TWADDLE) &&*/
2318                     ( ( !probing || (DP->read_track &
2319                            (1 <<DRS->probed_format))))){
2320                         max_size = CURRENT->nr_sectors;
2321                 } else {
2322                         current_addr = CURRENT->buffer;
2323                         raw_cmd.length = current_count_sectors << 9;
2324                         return 2;
2325                 }
2326         }
2327 
2328         if ( CT(COMMAND) == FD_READ )
2329                 max_size = max_sector; /* unbounded */
2330 
2331         /* claim buffer track if needed */
2332         if (buffer_track != raw_cmd.track ||  /* bad track */
2333             buffer_drive !=current_drive || /* bad drive */
2334             sector_t < buffer_min ||
2335             ((CT(COMMAND) == FD_READ ||
2336               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2337              max_sector > 2 * max_buffer_sectors + buffer_min &&
2338              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2339             /* not enough space */ ){
2340                 buffer_track = -1;
2341                 buffer_drive = current_drive;
2342                 buffer_max = buffer_min = aligned_sector_t;
2343         }
2344         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2345 
2346         if ( CT(COMMAND) == FD_WRITE ){
2347                 /* copy write buffer to track buffer.
2348                  * if we get here, we know that the write
2349                  * is either aligned or the data already in the buffer
2350                  * (buffer will be overwritten) */
2351 #ifdef CONFIG_FLOPPY_SANITY
2352                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2353                         DPRINT("internal error offset !=0 on write\n");
2354 #endif
2355                 buffer_track = raw_cmd.track;
2356                 buffer_drive = current_drive;
2357                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2358         } else
2359                 transfer_size(ssize, max_sector,
2360                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2361 
2362         /* round up current_count_sectors to get dma xfer size */
2363         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2364         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2365         raw_cmd.length <<= 9;
2366 #ifdef CONFIG_FLOPPY_SANITY
2367         if ((raw_cmd.length < current_count_sectors << 9) ||
2368             (current_addr != CURRENT->buffer &&
2369              CT(COMMAND) == FD_WRITE &&
2370              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2371               aligned_sector_t < buffer_min )) ||
2372             raw_cmd.length % ( 128 << SIZECODE ) ||
2373             raw_cmd.length <= 0 || current_count_sectors <= 0){
2374                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2375                         raw_cmd.length, current_count_sectors);
2376                 if ( current_addr != CURRENT->buffer )
2377                         printk("addr=%d, length=%ld\n",
2378                                (int) ((current_addr - floppy_track_buffer ) >> 9),
2379                                current_count_sectors);
2380                 printk("st=%d ast=%d mse=%d msi=%d\n",
2381                        sector_t, aligned_sector_t, max_sector, max_size);
2382                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2383                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2384                        COMMAND, SECTOR, HEAD, TRACK);
2385                 printk("buffer drive=%d\n", buffer_drive);
2386                 printk("buffer track=%d\n", buffer_track);
2387                 printk("buffer_min=%d\n", buffer_min );
2388                 printk("buffer_max=%d\n", buffer_max );
2389                 return 0;
2390         }
2391 
2392         if (current_addr != CURRENT->buffer ){
2393                 if (current_addr < floppy_track_buffer ||
2394                     current_count_sectors < 0 ||
2395                     raw_cmd.length < 0 ||
2396                     current_addr + raw_cmd.length >
2397                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2398                         DPRINT("buffer overrun in schedule dma\n");
2399                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2400                                sector_t, buffer_min,
2401                                raw_cmd.length >> 9 );
2402                         printk("current_count_sectors=%ld\n",
2403                                current_count_sectors);
2404                         if ( CT(COMMAND) == FD_READ )
2405                                 printk("read\n");
2406                         if ( CT(COMMAND) == FD_READ )
2407                                 printk("write\n");
2408                         return 0;
2409                 }
2410         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2411                    current_count_sectors > CURRENT->nr_sectors){
2412                 DPRINT("buffer overrun in direct transfer\n");
2413                 return 0;
2414         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2415                 DPRINT("more sectors than bytes\n");
2416                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2417                 printk("sectors=%ld\n", current_count_sectors);
2418         }
2419 #endif
2420         return 2;
2421 }
2422 
2423 static void redo_fd_request(void)
     /*  */
2424 {
2425 #define REPEAT {request_done(0); continue; }
2426         int device;
2427         int tmp;
2428         int error;
2429 
2430         error = -1;
2431         if (current_drive < N_DRIVE)
2432                 floppy_off(current_drive);
2433 
2434         if (CURRENT && CURRENT->dev < 0) return;
2435 
2436         while(1){
2437                 if (!CURRENT) {
2438                         CLEAR_INTR;
2439                         unlock_fdc();
2440                         return;
2441                 }
2442                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2443                         panic(DEVICE_NAME ": request list destroyed");
2444                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2445                         panic(DEVICE_NAME ": block not locked");
2446 #if 0
2447                 if (!CURRENT->bh->b_count && 
2448                     (CURRENT->errors || error == CURRENT->dev)){
2449                         error=CURRENT->dev;
2450                         DPRINT("skipping read ahead buffer\n");
2451                         REPEAT;
2452                 }
2453 #endif
2454                 error=-1;
2455                 device = CURRENT->dev;
2456                 set_fdc( DRIVE(device));
2457 
2458                 del_timer(&fd_timeout);
2459                 fd_timeout.expires = DP->timeout;
2460                 add_timer(&fd_timeout);
2461 
2462                 set_floppy(device);
2463                 if(start_motor(redo_fd_request)) return;
2464                 if(test_bit(current_drive, &fake_change) ||
2465                    TESTF(FD_DISK_CHANGED)){
2466                         DPRINT("disk absent or changed during operation\n");
2467                         REPEAT;
2468                 }
2469                 if (!floppy) { /* Autodetection */
2470                         if (!probing){
2471                                 DRS->probed_format = 0;
2472                                 if ( next_valid_format() ){
2473                                         DPRINT("no autodetectable formats\n");
2474                                         floppy = NULL;
2475                                         REPEAT;
2476                                 }
2477                         }
2478                         probing = 1;
2479                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2480                 } else
2481                         probing = 0;
2482                 errors = & (CURRENT->errors);
2483                 tmp = make_raw_rw_request();
2484                 if ( tmp < 2 ){
2485                         request_done(tmp);
2486                         continue;
2487                 }
2488 
2489                 if (TESTF(FD_NEED_TWADDLE))
2490                         twaddle();
2491                 floppy_tq.routine = (void *)(void *) floppy_start;
2492                 queue_task(&floppy_tq, &tq_timer);
2493 #ifdef DEBUGT
2494                 debugt("queue fd request");
2495 #endif
2496                 return;
2497         }
2498 #undef REPEAT
2499 }
2500 
2501 static struct cont_t rw_cont={
2502         rw_interrupt,
2503         redo_fd_request,
2504         bad_flp_intr,
2505         request_done };
2506 
2507 struct tq_struct request_tq = 
2508 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2509 
2510 static void process_fd_request(void)
     /*  */
2511 {
2512         cont = &rw_cont;
2513         queue_task(&request_tq, &tq_timer);
2514 }
2515 
2516 static void do_fd_request(void)
     /*  */
2517 {
2518         if (fdc_busy)
2519                 /* fdc busy, this new request will be treated when the
2520                    current one is done */
2521                 return;
2522         /* fdc_busy cannot be set by an interrupt or a bh */
2523         floppy_grab_irq_and_dma();
2524         fdc_busy=1;
2525         process_fd_request();
2526 }
2527 
2528 static struct cont_t poll_cont={
2529         success_and_wakeup,
2530         floppy_ready,
2531         generic_failure,
2532         generic_done };
2533 
2534 static int poll_drive(int interruptible, int flag){
     /*  */
2535         int ret;
2536         /* no auto-sense, just clear dcl */
2537         raw_cmd.flags= flag;
2538         raw_cmd.track=0;
2539         raw_cmd.cmd_count=0;
2540         cont = &poll_cont;
2541 #ifdef DCL_DEBUG
2542                 if (DP->flags & FD_DEBUG){
2543                         DPRINT("setting NEWCHANGE in poll_drive\n");
2544                 }
2545 #endif
2546         SETF(FD_DISK_NEWCHANGE);
2547         WAIT(floppy_ready);
2548         return ret;
2549 }
2550 
2551 /*
2552  * User triggered reset
2553  * ====================
2554  */
2555 
2556 static void reset_intr(void)
     /*  */
2557 {
2558         printk("weird, reset interrupt called\n");
2559 }
2560 
2561 static struct cont_t reset_cont={
2562         reset_intr,
2563         success_and_wakeup,
2564         generic_failure,
2565         generic_done };
2566 
2567 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2568 {
2569         int ret;
2570 
2571         ret=0;
2572         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2573                 return 0;
2574         LOCK_FDC(drive,interruptible);
2575         if(arg == FD_RESET_ALWAYS)
2576                 FDCS->reset=1;
2577         if ( FDCS->reset ){
2578                 cont = &reset_cont;
2579                 del_timer(&fd_timeout);
2580                 fd_timeout.expires = DP->timeout;
2581                 add_timer(&fd_timeout);
2582                 WAIT(reset_fdc);
2583         }
2584         process_fd_request();
2585         return ret;
2586 }
2587 
2588 /*
2589  * Misc Ioctl's and support
2590  * ========================
2591  */
2592 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2593 {
2594         int i;
2595 
2596         i = verify_area(VERIFY_WRITE,param,size);
2597         if (i)
2598                 return i;
2599         memcpy_tofs(param,(void *) address, size);
2600         return 0;
2601 }
2602 
2603 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2604 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2605 
2606 static char *drive_name(int type, int drive )
     /*  */
2607 {
2608         struct floppy_struct *floppy;   
2609 
2610         if ( type )
2611                 floppy = floppy_type + type;
2612         else {
2613                 if ( UDP->native_format )
2614                         floppy = floppy_type + UDP->native_format;
2615                 else
2616                         return "(null)";
2617         }
2618         if ( floppy->name )
2619                 return floppy->name;
2620         else
2621                 return "(null)";
2622 }
2623 
2624 /* raw commands */
2625 static struct cont_t raw_cmd_cont={
2626         success_and_wakeup,
2627         failure_and_wakeup,
2628         generic_failure,
2629         generic_done };
2630 
2631 static int raw_cmd_ioctl(void *param)
     /*  */
2632 {
2633         int i, drive, count, ret;
2634 
2635         if ( FDCS->rawcmd <= 1 )
2636                 FDCS->rawcmd = 1;
2637         for ( drive= 0; drive < N_DRIVE; drive++){
2638                 if ( FDC(drive) != fdc)
2639                         continue;
2640                 if ( drive == current_drive ){
2641                         if ( UDRS->fd_ref > 1 ){
2642                                 FDCS->rawcmd = 2;
2643                                 break;
2644                         }
2645                 } else if ( UDRS->fd_ref ){
2646                         FDCS->rawcmd = 2;
2647                         break;
2648                 }
2649         }
2650 
2651         if(FDCS->reset)
2652                 return -EIO;
2653 
2654         COPYIN(raw_cmd);
2655         raw_cmd.rate &= 0x03;   
2656         count = raw_cmd.length;
2657         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2658                 if(count > max_buffer_sectors * 1024 )
2659                         return -ENOMEM;
2660                 buffer_track = -1;
2661         }
2662         if ( raw_cmd.flags & FD_RAW_WRITE ){
2663                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2664                 if (i)
2665                         return i;
2666                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2667         }
2668 
2669         current_addr = floppy_track_buffer;
2670         cont = &raw_cmd_cont;
2671         IWAIT(floppy_start);
2672 #ifdef DCL_DEBUG
2673         if (DP->flags & FD_DEBUG){
2674                 DPRINT("calling disk change from raw_cmd ioctl\n");
2675         }
2676 #endif
2677         if( disk_change(current_drive) )
2678                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2679         else
2680                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2681         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2682                 motor_off_callback(current_drive);      
2683 
2684         if ( !ret && !FDCS->reset ){
2685                 raw_cmd.reply_count = inr;
2686                 for( i=0; i< raw_cmd.reply_count; i++)
2687                         raw_cmd.reply[i] = reply_buffer[i];
2688                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2689                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2690         } else
2691                 ret = -EIO;
2692         DRS->track = NO_TRACK;
2693         if ( ret )
2694                 return ret;
2695 
2696         if ( raw_cmd.flags & FD_RAW_READ ){
2697                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2698                 if (i)
2699                         return i;
2700         }
2701        
2702         return COPYOUT(raw_cmd);
2703 }
2704 
2705 static int invalidate_drive(int rdev)
     /*  */
2706 {
2707         /* invalidate the buffer track to force a reread */
2708         set_bit( DRIVE(rdev), &fake_change);
2709         process_fd_request();
2710         check_disk_change(rdev);
2711         return 0;
2712 }
2713 
2714 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2715     unsigned long param)
2716 {
2717 #define IOCTL_MODE_BIT 8
2718 #define OPEN_WRITE_BIT 16
2719 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2720 
2721         struct floppy_struct newparams;
2722         struct format_descr tmp_format_req;
2723         int i,device,drive,type,cnt;
2724         struct floppy_struct *this_floppy;
2725         char *name;
2726 
2727         device = inode->i_rdev;
2728         switch (cmd) {
2729                 RO_IOCTLS(device,param);
2730         }
2731         type = TYPE(device);
2732         drive = DRIVE(device);
2733         switch (cmd) {
2734         case FDGETDRVTYP:
2735                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2736                 if (i)
2737                         return i;
2738                 name = drive_name(type,drive);
2739                 for ( cnt=0; cnt<16; cnt++){
2740                         put_fs_byte(name[cnt],
2741                                     ((char*)param)+cnt);
2742                         if ( ! *name )
2743                                 break;
2744                 }
2745                 return 0;
2746         case FDGETMAXERRS:
2747                 return COPYOUT(UDP->max_errors);
2748         case FDGETPRM:
2749                 if (type)
2750                         this_floppy = &floppy_type[type];
2751                 else if ((this_floppy = current_type[drive]) ==
2752                          NULL)
2753                         return -ENODEV;
2754                 return COPYOUT(this_floppy[0]);
2755         case FDPOLLDRVSTAT:
2756                 LOCK_FDC(drive,1);
2757                 CALL(poll_drive(1, FD_RAW_NEED_DISK));
2758                 process_fd_request();
2759                 /* fall through */
2760         case FDGETDRVSTAT:
2761                 return COPYOUT(*UDRS);
2762         case FDGETFDCSTAT:
2763                 return COPYOUT(*UFDCS);
2764         case FDGETDRVPRM:
2765                 return COPYOUT(*UDP);
2766         case FDWERRORGET:
2767                 return COPYOUT(*UDRWE);
2768         }
2769         if (!IOCTL_ALLOWED)
2770                 return -EPERM;
2771         switch (cmd) {
2772         case FDWERRORCLR:
2773                 UDRWE->write_errors = 0;
2774                 UDRWE->first_error_sector = 0;
2775                 UDRWE->first_error_generation = 0;
2776                 UDRWE->last_error_sector = 0;
2777                 UDRWE->last_error_generation = 0;
2778                 UDRWE->badness = 0;
2779                 return 0;
2780         case FDRAWCMD:
2781                 if (type)
2782                         return -EINVAL;
2783                 LOCK_FDC(drive,1);
2784                 set_floppy(device);
2785                 CALL(i = raw_cmd_ioctl((void *) param));
2786                 process_fd_request();
2787                 return i;
2788         case FDFMTTRK:
2789                 if (UDRS->fd_ref != 1)
2790                         return -EBUSY;
2791                 COPYIN(tmp_format_req);
2792                 return do_format(device, &tmp_format_req);
2793         case FDSETMAXERRS:
2794                 return COPYIN(UDP->max_errors);
2795         case FDFMTBEG:
2796                 return 0;
2797         case FDCLRPRM:
2798                 LOCK_FDC(drive,1);
2799                 current_type[drive] = NULL;
2800                 floppy_sizes[drive] = MAX_DISK_SIZE;
2801                 UDRS->keep_data = 0;
2802                 return invalidate_drive(device);
2803         case FDFMTEND:
2804         case FDFLUSH:
2805                 LOCK_FDC(drive,1);
2806                 return invalidate_drive(device);
2807         case FDSETPRM:
2808         case FDDEFPRM:
2809                 COPYIN(newparams);
2810                 /* sanity checking for parameters.*/
2811                 if(newparams.sect <= 0 ||
2812                    newparams.head <= 0 ||
2813                    newparams.track <= 0 ||
2814                    newparams.track >
2815                    UDP->tracks>>newparams.stretch)
2816                         return -EINVAL;
2817                 if ( type){
2818                         if ( !suser() )
2819                                 return -EPERM;
2820                         LOCK_FDC(drive,1);
2821                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2822                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2823                                     drive_state[cnt].fd_ref)
2824                                         set_bit(drive, &fake_change);
2825                         }
2826                         floppy_type[type] = newparams;
2827                         floppy_type[type].name="user format";
2828                         for (cnt = type << 2 ;
2829                              cnt < (type << 2 ) + 4 ;
2830                              cnt++)
2831                                 floppy_sizes[cnt]=
2832 #ifdef CONFIG_FLOPPY_2_FDC
2833                                         floppy_sizes[cnt+0x80]=
2834 #endif
2835                                                 floppy_type[type].size>>1;
2836                         process_fd_request();
2837                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2838                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2839                                     drive_state[cnt].fd_ref)
2840                                         check_disk_change(drive_state[cnt].
2841                                                           fd_device);
2842                         }
2843                         return 0;
2844                 }
2845 
2846                 LOCK_FDC(drive,1);
2847                 if ( cmd != FDDEFPRM )
2848                         /* notice a disk change immediately, else
2849                          * we loose our settings immediately*/
2850                         CALL(poll_drive(1,0));
2851                 user_params[drive] = newparams;
2852                 if (buffer_drive == drive &&
2853                     buffer_max > user_params[drive].sect)
2854                         buffer_max=user_params[drive].sect;
2855                 current_type[drive] = &user_params[drive];
2856                 floppy_sizes[drive] = user_params[drive].size >> 1;
2857                 if (cmd == FDDEFPRM)
2858                         DRS->keep_data = -1;
2859                 else
2860                         DRS->keep_data = 1;
2861                 /* invalidation. Invalidate only when needed, i.e.
2862                  * when there are already sectors in the buffer cache
2863                  * whose number will change. This is useful, because
2864                  * mtools often changes the geometry of the disk after
2865                  * looking at the boot block */
2866                 if (DRS->maxblock >
2867                     user_params[drive].sect ||
2868                     DRS->maxtrack )
2869                         invalidate_drive(device);
2870                 else
2871                         process_fd_request();
2872                 return 0;
2873         case FDRESET:
2874                 return user_reset_fdc( drive, (int)param, 1);
2875         case FDMSGON:
2876                 UDP->flags |= FTD_MSG;
2877                 return 0;
2878         case FDMSGOFF:
2879                 UDP->flags &= ~FTD_MSG;
2880                 return 0;
2881         case FDSETEMSGTRESH:
2882                 UDP->max_errors.reporting =
2883                         (unsigned short) (param & 0x0f);
2884                 return 0;
2885         case FDTWADDLE:
2886                 LOCK_FDC(drive,1);
2887                 twaddle();
2888                 process_fd_request();
2889         }
2890         if ( ! suser() )
2891                 return -EPERM;
2892         switch(cmd){
2893         case FDSETDRVPRM:
2894                 return COPYIN(*UDP);
2895         default:
2896                 return -EINVAL;
2897         }
2898         return 0;
2899 #undef IOCTL_ALLOWED
2900 }
2901 
2902 static void set_base_type(int drive,int code)
     /*  */
2903 {
2904         if (code > 0 && code <= NUMBER(default_drive_params)) {
2905                 memcpy((char *) UDP,
2906                        (char *) (&default_drive_params[code].params),
2907                        sizeof( struct floppy_drive_params ));
2908                 printk("fd%d is %s", drive, default_drive_params[code].name);
2909                 return;
2910         } else if (!code)
2911                 printk("fd%d is not installed", drive);
2912         else
2913                 printk("fd%d is unknown type %d",drive,code);
2914 }
2915 
2916 static void config_types(void)
     /*  */
2917 {
2918         int drive;
2919 
2920         for (drive=0; drive<N_DRIVE ; drive++){
2921                 /* default type for unidentifiable drives */
2922                 memcpy((char *) UDP, (char *) (&default_drive_params->params),
2923                        sizeof( struct floppy_drive_params ));
2924         }
2925         printk("Floppy drive(s): ");
2926         set_base_type(0, FLOPPY0_TYPE);
2927         if (FLOPPY1_TYPE) {
2928                 printk(", ");
2929                 set_base_type(1, FLOPPY1_TYPE);
2930         }
2931         printk("\n");
2932 }
2933 
2934 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
2935                        char * buf, int count)
2936 {
2937         int drive = DRIVE(inode->i_rdev);
2938 
2939         check_disk_change(inode->i_rdev);
2940         if (UTESTF(FD_DISK_CHANGED))
2941                 return -ENXIO;
2942         return block_read(inode, filp, buf, count);
2943 }
2944 
2945 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
2946                         char * buf, int count)
2947 {
2948         int block;
2949         int ret;
2950         int drive = DRIVE(inode->i_rdev);
2951 
2952         if(!UDRS->maxblock)
2953                 UDRS->maxblock=1;/* make change detectable */
2954         check_disk_change(inode->i_rdev);
2955         if (UTESTF(FD_DISK_CHANGED)) 
2956                 return -ENXIO;
2957         if(!UTESTF(FD_DISK_WRITABLE))
2958                 return -EROFS;
2959         block = (filp->f_pos + count) >> 9;
2960         if(block > UDRS->maxblock)
2961                 UDRS->maxblock = block;
2962         ret= block_write(inode, filp, buf, count);
2963         return ret;
2964 }
2965 
2966 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
2967 {
2968         int drive;
2969         
2970         drive = DRIVE(inode->i_rdev);
2971 
2972         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
2973                 /* if the file is mounted OR (writable now AND writable at
2974                  * open time) Linus: Does this cover all cases? */
2975                 block_fsync(inode,filp);
2976                         
2977         if (UDRS->fd_ref < 0)
2978                 UDRS->fd_ref=0;
2979         else if (!UDRS->fd_ref--) {
2980                 DPRINT("floppy_release with fd_ref == 0");
2981                 UDRS->fd_ref = 0;
2982         }
2983         floppy_release_irq_and_dma();
2984 }
2985 
2986 /*
2987  * floppy_open check for aliasing (/dev/fd0 can be the same as
2988  * /dev/PS0 etc), and disallows simultaneous access to the same
2989  * drive with different device numbers.
2990  */
2991 #define RETERR(x) \
2992         do{floppy_release(inode,filp); \
2993            return -(x);}while(0)
2994 
2995 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2996 {
2997         int drive;
2998         int old_dev;
2999 
3000         if (!filp) {
3001                 DPRINT("Weird, open called with filp=0\n");
3002                 return -EIO;
3003         }
3004 
3005         drive = DRIVE(inode->i_rdev);
3006         if (drive >= N_DRIVE || 
3007             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3008             fdc_state[FDC(drive)].version == FDC_NONE)
3009                 return -ENXIO;
3010 
3011         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3012                 return -ENXIO;
3013         old_dev = UDRS->fd_device;
3014         if (UDRS->fd_ref && old_dev != inode->i_rdev)
3015                 return -EBUSY;
3016 
3017         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3018                 USETF(FD_DISK_CHANGED);
3019                 USETF(FD_VERIFY);
3020         }
3021 
3022         if(UDRS->fd_ref == -1 ||
3023            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3024                 return -EBUSY;
3025 
3026         if (floppy_grab_irq_and_dma())
3027                 return -EBUSY;
3028 
3029         if (filp->f_flags & O_EXCL)
3030                 UDRS->fd_ref = -1;
3031         else
3032                 UDRS->fd_ref++;
3033 
3034         UDRS->fd_device = inode->i_rdev;
3035 
3036         if (old_dev && old_dev != inode->i_rdev) {
3037                 if (buffer_drive == drive)
3038                         buffer_track = -1;
3039                 invalidate_buffers(old_dev);
3040         }
3041 
3042         /* Allow ioctls if we have write-permissions even if read-only open */
3043         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3044                 filp->f_mode |= IOCTL_MODE_BIT;
3045         if (filp->f_mode & 2)
3046                 filp->f_mode |= OPEN_WRITE_BIT;
3047 
3048         if (UFDCS->rawcmd == 1)
3049                UFDCS->rawcmd = 2;
3050 
3051         if (filp->f_flags & O_NDELAY)
3052                 return 0;
3053         if (filp->f_mode & 3) {
3054                 UDRS->last_checked = 0;
3055                 check_disk_change(inode->i_rdev);
3056                 if (UTESTF(FD_DISK_CHANGED))
3057                         RETERR(ENXIO);
3058         }
3059         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3060                 RETERR(EROFS);
3061         return 0;
3062 #undef RETERR
3063 }
3064 
3065 /*
3066  * Check if the disk has been changed or if a change has been faked.
3067  */
3068 static int check_floppy_change(dev_t dev)
     /*  */
3069 {
3070         int drive = DRIVE( dev );
3071 
3072         if (MAJOR(dev) != MAJOR_NR) {
3073                 DPRINT("floppy_changed: not a floppy\n");
3074                 return 0;
3075         }
3076 
3077         if (UTESTF(FD_DISK_CHANGED))
3078                 return 1;
3079 
3080         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3081                 lock_fdc(drive,0);
3082                 poll_drive(0,0);
3083                 process_fd_request();
3084         }
3085                 
3086         if(UTESTF(FD_DISK_CHANGED) ||
3087            test_bit(drive, &fake_change) ||
3088            (!TYPE(dev) && !current_type[drive]))
3089                 return 1;
3090         return 0;
3091 }
3092 
3093 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3094  * the bootblock (block 0). "Autodetection" is also needed to check whether
3095  * there is a disk in the drive at all... Thus we also do it for fixed
3096  * geometry formats */
3097 static int floppy_revalidate(dev_t dev)
     /*  */
3098 {
3099 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3100         struct buffer_head * bh;
3101         int drive=DRIVE(dev);
3102         int cf;
3103 
3104         if(UTESTF(FD_DISK_CHANGED) || test_bit(drive, &fake_change) || NO_GEOM){
3105                 lock_fdc(drive,0);
3106                 cf = UTESTF(FD_DISK_CHANGED);
3107                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3108                         process_fd_request(); /*already done by another thread*/
3109                         return 0;
3110                 }
3111                 UDRS->maxblock = 0;
3112                 UDRS->maxtrack = 0;
3113                 if ( buffer_drive == drive)
3114                         buffer_track = -1;
3115                 clear_bit(drive, &fake_change);
3116                 UCLEARF(FD_DISK_CHANGED);
3117                 if(cf)
3118                         UDRS->generation++;
3119                 if(NO_GEOM){
3120                         /* auto-sensing */
3121                         int size = floppy_blocksizes[MINOR(dev)];
3122                         if (!size)
3123                                 size = 1024;
3124                         if (!(bh = getblk(dev,0,size))){
3125                                 process_fd_request();
3126                                 return 1;
3127                         }
3128                         if ( bh && ! bh->b_uptodate)
3129                                 ll_rw_block(READ, 1, &bh);
3130                         process_fd_request();
3131                         wait_on_buffer(bh);
3132                         brelse(bh);
3133                         return 0;
3134                 } 
3135                 if(cf)
3136                                 poll_drive(0, FD_RAW_NEED_DISK);
3137                 process_fd_request();
3138         }
3139         return 0;
3140 }
3141 
3142 static struct file_operations floppy_fops = {
3143         NULL,                   /* lseek - default */
3144         floppy_read,            /* read - general block-dev read */
3145         floppy_write,           /* write - general block-dev write */
3146         NULL,                   /* readdir - bad */
3147         NULL,                   /* select */
3148         fd_ioctl,               /* ioctl */
3149         NULL,                   /* mmap */
3150         floppy_open,            /* open */
3151         floppy_release,         /* release */
3152         block_fsync,            /* fsync */
3153         NULL,                   /* fasync */
3154         check_floppy_change,    /* media_change */
3155         floppy_revalidate,      /* revalidate */
3156 };
3157 
3158 /*
3159  * Floppy Driver initialisation
3160  * =============================
3161  */
3162 
3163 /* Determine the floppy disk controller type */
3164 /* This routine was written by David C. Niemi */
3165 static char get_fdc_version(void)
     /*  */
3166 {
3167         int r;
3168 
3169         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3170         if ( FDCS->reset )
3171                 return FDC_NONE;
3172         if ( (r = result()) <= 0x00)
3173                 return FDC_NONE;        /* No FDC present ??? */
3174         if ((r==1) && (reply_buffer[0] == 0x80)){
3175                 printk("FDC %d is a 8272A\n",fdc);
3176                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3177         }
3178         if (r != 10) {
3179                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3180                 return FDC_UNKNOWN;
3181         }
3182         output_byte(FD_VERSION);
3183         r = result();
3184         if ((r == 1) && (reply_buffer[0] == 0x80)){
3185                 printk("FDC %d is a 82072\n",fdc);
3186                 return FDC_82072;               /* 82072 doesn't know VERSION */
3187         }
3188         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3189                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3190                 return FDC_UNKNOWN;
3191         }
3192         output_byte(FD_UNLOCK);
3193         r = result();
3194         if ((r == 1) && (reply_buffer[0] == 0x80)){
3195                 printk("FDC %d is a pre-1991 82077\n", fdc);
3196                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3197         }
3198         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3199                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3200                 return FDC_UNKNOWN;
3201         }
3202         printk("FDC %d is a post-1991 82077\n",fdc);
3203         return FDC_82077;       /* Revised 82077AA passes all the tests */
3204 } /* get_fdc_version */
3205 
3206 /* lilo configuration */
3207 static void invert_dcl(int *ints)
     /*  */
3208 {
3209         int i;
3210         
3211         for (i=0; i < ARRAY_SIZE(default_drive_params); i++)
3212                 default_drive_params[i].params.flags |= 0x80;
3213         DPRINT("Configuring drives for inverted dcl\n");
3214 }
3215 
3216 static void allow_drives(int *ints)
     /*  */
3217 {
3218         if (ints[1] >= 1 ){
3219                 ALLOWED_DRIVE_MASK=ints[1];
3220                 DPRINT1("setting allowed_drive_mask to 0x%x\n", ints[1]);
3221         } else
3222                 DPRINT("allowed_drive_mask needs a parameter\n");
3223 }
3224 
3225 #ifdef  CONFIG_FLOPPY_2_FDC
3226 static void twofdc(int *ints)
     /*  */
3227 {
3228         FDC2 = 0x370;
3229         DPRINT("enabling second fdc at address 0x370\n");
3230 }
3231 #endif
3232 
3233 static struct param_table {
3234         char *name;
3235         void (*fn)(int *ints);
3236 } config_params[]={
3237 { "allowed_drive_mask", allow_drives },
3238 #ifdef  CONFIG_FLOPPY_2_FDC
3239 { "two_fdc", twofdc },
3240 #endif
3241 { "thinkpad", invert_dcl } };
3242 
3243 void floppy_setup(char *str, int *ints)
     /*  */
3244 {
3245         int i;
3246         if(!str)
3247                 return;
3248         for(i=0; i< ARRAY_SIZE(config_params); i++){
3249                 if (strcmp(str,config_params[i].name) == 0 ){
3250                         config_params[i].fn(ints);
3251                         return;
3252                 }
3253         }
3254         printk("unknown floppy parameter %s\n", str);
3255 }
3256 #define FLOPPY_SETUP
3257 
3258 #ifdef FD_MODULE
3259 static
3260 #endif
3261 int new_floppy_init(void)
     /*  */
3262 {
3263         int i,drive;
3264         int have_no_fdc=0;
3265 
3266         sti();
3267 
3268         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3269                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3270                 return -EBUSY;
3271         }
3272 
3273         for(i=0; i<256; i++)
3274                 if ( TYPE(i))
3275                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3276                 else
3277                         floppy_sizes[i] = MAX_DISK_SIZE;
3278 
3279         blk_size[MAJOR_NR] = floppy_sizes;
3280         blksize_size[MAJOR_NR] = floppy_blocksizes;
3281         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3282         del_timer(&fd_timeout);
3283         config_types();
3284 
3285         fdc_state[0].address = FDC1;
3286         fdc_state[0].dor = 0;
3287 #if N_FDC > 1
3288         fdc_state[1].address = FDC2;
3289         fdc_state[1].dor = 0;
3290 #endif
3291 
3292         for (i = 0 ; i < N_FDC ; i++) {
3293                 fdc = i;
3294                 FDCS->dtr = -1;
3295                 FDCS->dor = 0x4;
3296                 FDCS->reset = 0;
3297                 FDCS->version = FDC_NONE;
3298         }
3299 
3300         if(floppy_grab_irq_and_dma()){
3301                 unregister_blkdev(MAJOR_NR,"fd");
3302                 return -EBUSY;
3303         }
3304 
3305         /* initialise drive state */
3306         for (drive = 0; drive < N_DRIVE ; drive++) {
3307                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3308                 UDRS->generation = 0;
3309                 UDRS->keep_data = 0;
3310                 UDRS->fd_ref = 0;
3311                 UDRS->fd_device = 0;
3312                 UDRWE->write_errors = 0;
3313                 UDRWE->first_error_sector = 0;
3314                 UDRWE->first_error_generation = 0;
3315                 UDRWE->last_error_sector = 0;
3316                 UDRWE->last_error_generation = 0;
3317                 UDRWE->badness = 0;
3318         }
3319 
3320         for (i = 0 ; i < N_FDC ; i++) {
3321                 fdc = i;
3322                 if (FDCS->address == -1 )
3323                         continue;
3324                 FDCS->rawcmd = 2;
3325                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3326                         FDCS->address = -1;
3327                         continue;
3328                 }
3329                 /* Try to determine the floppy controller type */
3330                 FDCS->version = get_fdc_version();
3331                 if (FDCS->version == FDC_NONE){
3332                         FDCS->address = -1;
3333                         continue;
3334                 }
3335 
3336                 have_no_fdc = 0;
3337                 /* Not all FDCs seem to be able to handle the version command
3338                  * properly, so force a reset for the standard FDC clones,
3339                  * to avoid interrupt garbage.
3340                  */
3341                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3342                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3343         }
3344         fdc=0;
3345         current_drive = 0;
3346         floppy_release_irq_and_dma();
3347         initialising=0;
3348         if(have_no_fdc)
3349                 unregister_blkdev(MAJOR_NR,"fd");
3350         return have_no_fdc;
3351 }
3352 
3353 /* stupid compatibility hack... */
3354 void floppy_init(void)
     /*  */
3355 {
3356         new_floppy_init();
3357 }
3358 
3359 static int floppy_grab_irq_and_dma(void)
     /*  */
3360 {
3361         int i;
3362         cli();
3363         if (usage_count++){
3364                 sti();
3365                 return 0;
3366         }
3367         sti();
3368 #ifdef FD_MODULE
3369         MOD_INC_USE_COUNT;
3370 #endif
3371         for(i=0; i< N_FDC; i++){
3372                 if(FDCS->address != -1){        
3373                         fdc = i;
3374                         reset_fdc_info(1);
3375                         outb_p(FDCS->dor, FD_DOR);
3376                 }
3377         }
3378         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3379 
3380         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
3381                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3382                         FLOPPY_IRQ);
3383                 return -1;
3384         }
3385         if (request_dma(FLOPPY_DMA,"floppy")) {
3386                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3387                         FLOPPY_DMA);
3388                 free_irq(FLOPPY_IRQ);
3389                 return -1;
3390         }
3391         for(fdc = 0; fdc < N_FDC ; fdc++)
3392                 if(FDCS->address != -1)
3393                         outb_p(FDCS->dor, FD_DOR);
3394         fdc = 0;
3395         enable_irq(FLOPPY_IRQ);
3396         return 0;
3397 }
3398 
3399 static void floppy_release_irq_and_dma(void)
     /*  */
3400 {
3401 #ifdef CONFIG_FLOPPY_SANITY
3402         int drive;
3403 #endif
3404         cli();
3405         if (--usage_count){
3406                 sti();
3407                 return;
3408         }
3409         sti();
3410 #ifdef FD_MODULE
3411         MOD_DEC_USE_COUNT;
3412 #endif
3413         disable_dma(FLOPPY_DMA);
3414         free_dma(FLOPPY_DMA);
3415         disable_irq(FLOPPY_IRQ);
3416         free_irq(FLOPPY_IRQ);
3417 
3418         set_dor(0, ~0, 8);
3419 #if N_FDC > 1
3420         set_dor(1, ~8, 0);
3421 #endif
3422         floppy_enable_hlt();
3423 #ifdef CONFIG_FLOPPY_SANITY
3424         for(drive=0; drive < N_FDC * 4; drive++)
3425                 if( motor_off_timer[drive].next )
3426                         printk("motor off timer %d still active\n", drive);
3427         
3428         if(fd_timeout.next)
3429                 printk("floppy timer still active\n");
3430         if (fd_timer.next)
3431                 printk("auxiliary floppy timer still active\n");
3432         if(floppy_tq.sync)
3433                 printk("task queue still active\n");
3434 #endif
3435 }
3436