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. setup_DMA
18. output_byte
19. result
20. perpendicular_mode
21. fdc_specify
22. fdc_dtr
23. tell_sector
24. interpret_errors
25. setup_rw_floppy
26. seek_interrupt
27. check_wp
28. seek_floppy
29. recal_interrupt
30. unexpected_floppy_interrupt
31. floppy_interrupt
32. recalibrate_floppy
33. reset_interrupt
34. reset_fdc
35. empty
36. show_floppy
37. floppy_shutdown
38. start_motor
39. floppy_ready
40. floppy_start
41. do_wakeup
42. wait_til_done
43. generic_done
44. generic_success
45. generic_failure
46. success_and_wakeup
47. failure_and_wakeup
48. next_valid_format
49. bad_flp_intr
50. set_floppy
51. format_interrupt
52. setup_format_params
53. redo_format
54. do_format
55. request_done
56. rw_interrupt
57. buffer_chain_size
58. transfer_size
59. copy_buffer
60. make_raw_rw_request
61. redo_fd_request
62. process_fd_request
63. do_fd_request
64. poll_drive
65. reset_intr
66. user_reset_fdc
67. fd_copyout
68. drive_name
69. raw_cmd_ioctl
70. invalidate_drive
71. fd_ioctl
72. set_base_type
73. config_types
74. floppy_read
75. floppy_write
76. floppy_release
77. floppy_open
78. check_floppy_change
79. floppy_revalidate
80. get_fdc_version
81. invert_dcl
82. allow_drives
83. twofdc
84. floppy_setup
85. new_floppy_init
86. floppy_init
87. floppy_grab_irq_and_dma
88. 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 #ifdef CONFIG_BLK_DEV_FD
 112 #include <linux/sched.h>
 113 #include <linux/fs.h>
 114 #include <linux/kernel.h>
 115 #include <linux/timer.h>
 116 #include <linux/tqueue.h>
 117 #define FDPATCHES
 118 #include <linux/fdreg.h>
 119 #include <linux/fd.h>
 120 #include <linux/errno.h>
 121 #include <linux/malloc.h>
 122 #include <linux/string.h>
 123 #include <linux/fcntl.h>
 124 #include <linux/delay.h>
 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 
 139 #ifdef CONFIG_FLOPPY_2_FDC
 140 #define N_FDC 2
 141 #define N_DRIVE 8
 142 #else
 143 #define N_FDC 1
 144 #define N_DRIVE 4
 145 #endif
 146 
 147 #define TYPE(x) ( ((x)>>2) & 0x1f )
 148 #define DRIVE(x) ( ((x)&0x03) | (((x)&0x80 ) >> 5))
 149 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 150 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 151 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 152                                 /* reverse mapping from unit and fdc to drive */
 153 #define DP (&drive_params[current_drive])
 154 #define DRS (&drive_state[current_drive])
 155 #define DRWE (&write_errors[current_drive])
 156 #define FDCS (&fdc_state[fdc])
 157 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 158 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 159 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 160 
 161 #define UDP (&drive_params[drive])
 162 #define UDRS (&drive_state[drive])
 163 #define UDRWE (&write_errors[drive])
 164 #define UFDCS (&fdc_state[FDC(drive)])
 165 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 166 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 167 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 168 
 169 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive);
 170 
 171 #define DPRINT1(x,x1) \
 172 printk(DEVICE_NAME "%d: " x,current_drive,(x1));
 173 
 174 #define DPRINT2(x,x1,x2) \
 175 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2));
 176 
 177 #define DPRINT3(x,x1,x2,x3) \
 178 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3));
 179 
 180 /* read/write */
 181 #define COMMAND raw_cmd.cmd[0]
 182 #define DR_SELECT raw_cmd.cmd[1]
 183 #define TRACK raw_cmd.cmd[2]
 184 #define HEAD raw_cmd.cmd[3]
 185 #define SECTOR raw_cmd.cmd[4]
 186 #define SIZECODE raw_cmd.cmd[5]
 187 #define SECT_PER_TRACK raw_cmd.cmd[6]
 188 #define GAP raw_cmd.cmd[7]
 189 #define SIZECODE2 raw_cmd.cmd[8]
 190 #define NR_RW 9
 191 
 192 /* format */
 193 #define F_SIZECODE raw_cmd.cmd[2]
 194 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 195 #define F_GAP raw_cmd.cmd[4]
 196 #define F_FILL raw_cmd.cmd[5]
 197 #define NR_F 6
 198 
 199 /*
 200  * Maximum disk size (in kilobytes). This default is used whenever the
 201  * current disk size is unknown.
 202  * [Now it is rather a minimum]
 203  */
 204 #define MAX_DISK_SIZE 2 /* 3984*/
 205 
 206 
 207 
 208 /*
 209  * The DMA channel used by the floppy controller cannot access data at
 210  * addresses >= 16MB
 211  *
 212  * Went back to the 1MB limit, as some people had problems with the floppy
 213  * driver otherwise. It doesn't matter much for performance anyway, as most
 214  * floppy accesses go through the track buffer.
 215  */
 216 #define LAST_DMA_ADDR   (0x1000000)
 217 #define K_64 (0x10000) /* 64 k */
 218 
 219 /*
 220  * globals used by 'result()'
 221  */
 222 #define MAX_REPLIES 10
 223 static unsigned char reply_buffer[MAX_REPLIES];
 224 static int inr; /* size of reply buffer, when called from interrupt */
 225 #define ST0 (reply_buffer[0])
 226 #define ST1 (reply_buffer[1])
 227 #define ST2 (reply_buffer[2])
 228 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 229 #define R_TRACK (reply_buffer[3])
 230 #define R_HEAD (reply_buffer[4])
 231 #define R_SECTOR (reply_buffer[5])
 232 #define R_SIZECODE (reply_buffer[6])
 233 
 234 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 235 /*
 236  * this struct defines the different floppy drive types.
 237  */
 238 static struct {
 239         struct floppy_drive_params params;
 240         char *name; /* name printed while booting */
 241 } default_drive_params[]= {
 242 /* NOTE: the time values in jiffies should be in msec!
 243  CMOS drive type
 244   |     Maximum data rate supported by drive type
 245   |     |   Head load time, msec
 246   |     |   |   Head unload time, msec (not used)
 247   |     |   |   |     Step rate interval, usec
 248   |     |   |   |     |    Time needed for spinup time (jiffies)
 249   |     |   |   |     |    |    Timeout for spinning down (jiffies)
 250   |     |   |   |     |    |    |   Spindown offset (where disk stops)
 251   |     |   |   |     |    |    |   |  Select delay
 252   |     |   |   |     |    |    |   |  |  RPS
 253   |     |   |   |     |    |    |   |  |  |    Max number of tracks
 254   |     |   |   |     |    |    |   |  |  |    |     Interrupt timeout
 255   |     |   |   |     |    |    |   |  |  |    |     |   Max nonintlv. sectors
 256   |     |   |   |     |    |    |   |  |  |    |     |   | -Max Errors- flags */
 257 {{0,  500, 16, 16, 8000, 100, 300,  0, 2, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 258       0, { 7, 4, 8, 2, 1, 5, 3,10}, 150, 0 }, "unknown" },
 259 
 260 {{1,  300, 16, 16, 8000, 100, 300,  0, 2, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 261       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 150, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 262 
 263 {{2,  500, 16, 16, 6000,  40, 300, 14, 2, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 264       0, { 2, 5, 6,23,10,20,11, 0}, 150, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 265 
 266 {{3,  250, 16, 16, 3000, 100, 300,  0, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 267       0, { 4,22,21,30, 3, 0, 0, 0}, 150, 4 }, "720k" }, /*3 1/2 DD*/
 268 
 269 {{4,  500, 16, 16, 4000,  40, 300, 10, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 270       0, { 7, 4,25,22,31,21,29,11}, 150, 7 }, "1.44M" }, /*3 1/2 HD*/
 271 
 272 {{5, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 273       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 274 
 275 {{6, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 276       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M" } /*3 1/2 ED*/
 277 /*    |  ---autodetected formats--   |   |      |
 278       read_track                     |   |    Name printed when booting
 279                                      |  Native format
 280                                    Frequency of disk change checks */
 281 };
 282 
 283 static struct floppy_drive_params drive_params[N_DRIVE];
 284 static struct floppy_drive_struct drive_state[N_DRIVE];
 285 static struct floppy_write_errors write_errors[N_DRIVE];
 286 static struct floppy_raw_cmd raw_cmd;
 287 
 288 /*
 289  * This struct defines the different floppy types.
 290  *
 291  * The 'stretch' tells if the tracks need to be doubled for some
 292  * types (ie 360kB diskette in 1.2MB drive etc). Others should
 293  * be self-explanatory.
 294  */
 295 static struct floppy_struct floppy_type[32] = {
 296         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 297         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 298         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 299         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 300         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 301         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 302         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 303         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 304         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 305         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 306 
 307         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 308         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 309         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 310         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 311         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 312         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 313         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 314         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 315         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 316         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 317 
 318         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 319         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 320         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 321         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 322         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 323         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 324         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 325         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 326         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 327 
 328         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 329         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 330         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 331 };
 332 
 333 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 334 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 335 
 336 /* Auto-detection: Disk type used until the next media change occurs. */
 337 struct floppy_struct *current_type[N_DRIVE] = {
 338         NULL, NULL, NULL, NULL
 339 #ifdef CONFIG_FLOPPY_2_FDC
 340         ,
 341         NULL, NULL, NULL, NULL
 342 #endif
 343 };
 344 
 345 /*
 346  * User-provided type information. current_type points to
 347  * the respective entry of this array.
 348  */
 349 struct floppy_struct user_params[N_DRIVE];
 350 
 351 static int floppy_sizes[256];
 352 static int floppy_blocksizes[256] = { 0, };
 353 
 354 /*
 355  * The driver is trying to determine the correct media format
 356  * while probing is set. rw_interrupt() clears it after a
 357  * successful access.
 358  */
 359 static int probing = 0;
 360 
 361 /* Synchronization of FDC access. */
 362 #define FD_COMMAND_DETECT -2
 363 #define FD_COMMAND_NONE -1
 364 #define FD_COMMAND_ERROR 2
 365 #define FD_COMMAND_OKAY 3
 366 
 367 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 368 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 369 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 370 #define CALL(x) if( (x) == -EINTR) return -EINTR;
 371 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 372 #define WAIT(x) _WAIT((x),interruptible)
 373 #define IWAIT(x) _WAIT((x),1)
 374 
 375 /* Errors during formatting are counted here. */
 376 static int format_errors;
 377 
 378 /* Format request descriptor. */
 379 static struct format_descr format_req;
 380 
 381 /*
 382  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 383  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 384  * H is head unload time (1=16ms, 2=32ms, etc)
 385  */
 386 
 387 /*
 388  * Track buffer
 389  * Because these are written to by the DMA controller, they must
 390  * not contain a 64k byte boundary crossing, or data will be
 391  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 392  * Note that you must not change the sizes below without updating head.S.
 393  */
 394 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 395 #define max_buffer_sectors MAX_BUFFER_SECTORS
 396 
 397 int *errors;
 398 typedef void (*done_f)(int);
 399 struct cont_t {
 400 void (*interrupt)(void); /* this is called after the interrupt of the
 401                           * main command */
 402 void (*redo)(void); /* this is called to retry the operation */
 403 void (*error)(void); /* this is called to tally an error */
 404 done_f done; /* this is called to say if the operation has succeeded/failed */
 405 } *cont;
 406 
 407 static void floppy_ready(void);
 408 static void floppy_start(void);
 409 static void process_fd_request(void);
 410 static void recalibrate_floppy(void);
 411 static void floppy_shutdown(void);
 412 
 413 static int floppy_grab_irq_and_dma(void);
 414 static void floppy_release_irq_and_dma(void);
 415 
 416 /*
 417  * The "reset" variable should be tested whenever an interrupt is scheduled,
 418  * after the commands have been sent. This is to ensure that the driver doesn't
 419  * get wedged when the interrupt doesn't come because of a failed command.
 420  * reset doesn't need to be tested before sending commands, because
 421  * output_byte is automatically disabled when reset is set.
 422  */
 423 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 424 static void reset_fdc(void);
 425 
 426 /*
 427  * These are global variables, as that's the easiest way to give
 428  * information to interrupts. They are the data used for the current
 429  * request.
 430  */
 431 #define NO_TRACK -1
 432 #define NEED_1_RECAL -2
 433 #define NEED_2_RECAL -3
 434 
 435 /* */
 436 static int usage_count = 0;
 437 
 438 
 439 /* buffer related variables */
 440 static int buffer_track = -1;
 441 static int buffer_drive = -1;
 442 static int buffer_min = -1;
 443 static int buffer_max = -1;
 444 
 445 /* fdc related variables, should end up in a struct */
 446 static struct floppy_fdc_state fdc_state[N_FDC];
 447 static int fdc; /* current fdc */
 448 
 449 static struct floppy_struct * floppy = floppy_type;
 450 static unsigned char current_drive = 0;
 451 static long current_count_sectors = 0;
 452 static char *current_addr = 0;
 453 static unsigned char sector_t; /* sector in track */
 454 
 455 #ifdef DEBUGT
 456 long unsigned debugtimer;
 457 #endif
 458 
 459 /*
 460  * Debugging
 461  * =========
 462  */
 463 static inline void set_debugt(void)
     /*  */
 464 {
 465 #ifdef DEBUGT
 466         debugtimer = jiffies;
 467 #endif
 468 }
 469 
 470 static inline void debugt(char *message)
     /*  */
 471 {
 472 #ifdef DEBUGT
 473   if ( DP->flags & DEBUGT )
 474         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 475 #endif
 476 }
 477 
 478 /*
 479  * Bottom half floppy driver.
 480  * ==========================
 481  *
 482  * This part of the file contains the code talking directly to the hardware,
 483  * and also the main service loop (seek-configure-spinup-command)
 484  */
 485 
 486 /*
 487  * disk change.
 488  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 489  * and the last_checked date.
 490  *
 491  * last_checked is the date of the last check which showed 'no disk change'
 492  * FD_DISK_CHANGE is set under two conditions:
 493  * 1. The floppy has been changed after some i/o to that floppy already
 494  *    took place.
 495  * 2. No floppy disk is in the drive. This is done in order to ensure that
 496  *    requests are quickly flushed in case there is no disk in the drive. It
 497  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 498  *    the drive.
 499  *
 500  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 501  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 502  *  each seek. If a disk is present, the disk change line should also be
 503  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 504  *  change line is set, this means either that no disk is in the drive, or
 505  *  that it has been removed since the last seek.
 506  *
 507  * This means that we really have a third possibility too:
 508  *  The floppy has been changed after the last seek.
 509  */
 510 
 511 static int disk_change(int drive)
     /*  */
 512 {
 513         int fdc=FDC(drive);
 514 #ifdef CONFIG_FLOPPY_SANITY
 515         if(jiffies < UDP->select_delay + UDRS->select_date)
 516                 DPRINT("WARNING disk change called early\n");
 517         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 518            (FDCS->dor & 3) != UNIT(drive) ||
 519            fdc != FDC(drive)){
 520                 DPRINT("probing disk change on unselected drive\n");
 521                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 522                         FDCS->dor);
 523         }
 524 #endif
 525 
 526 #ifdef DCL_DEBUG
 527         if (UDP->flags & FD_DEBUG){
 528                 DPRINT1("checking disk change line for drive %d\n",drive);
 529                 DPRINT1("jiffies=%ld\n", jiffies);
 530                 DPRINT1("disk change line=%x\n",inb_p(FD_DIR)&0x80);
 531                 DPRINT1("flags=%x\n",UDRS->flags);
 532         }
 533 #endif
 534         if (UDP->flags & FD_BROKEN_DCL)
 535                 return UTESTF(FD_DISK_CHANGED);
 536         if( (inb_p(FD_DIR) ^ UDP->flags) & 0x80){
 537                 USETF(FD_VERIFY); /* verify write protection */         
 538                 if(UDRS->maxblock){
 539                         /* mark it changed */
 540                         USETF(FD_DISK_CHANGED);
 541 
 542                         /* invalidate its geometry */
 543                         if (UDRS->keep_data >= 0) {
 544                                 if ((UDP->flags & FTD_MSG) &&
 545                                     current_type[drive] != NULL)
 546                                         DPRINT("Disk type is undefined after "
 547                                                "disk change\n");
 548                                 current_type[drive] = NULL;
 549                                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] = MAX_DISK_SIZE;
 550                         }
 551                 }
 552                 /*USETF(FD_DISK_NEWCHANGE);*/
 553                 return 1;
 554         } else if(jiffies >= DRS->select_date+DP->select_delay){
 555                 UDRS->last_checked=jiffies;
 556                 UCLEARF(FD_DISK_NEWCHANGE);
 557         }
 558         return 0;
 559 }
 560 
 561 static inline int is_selected(int dor, int unit)
     /*  */
 562 {
 563         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 564 }
 565 
 566 static int set_dor(int fdc, char mask, char data)
     /*  */
 567 {
 568         register unsigned char drive, unit, newdor,olddor;
 569 
 570         if(FDCS->address == -1)
 571                 return -1;
 572 
 573         olddor = FDCS->dor;
 574         newdor =  (olddor & mask) | data;
 575         if ( newdor != olddor ){
 576                 unit = olddor & 0x3;
 577                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 578                         drive = REVDRIVE(fdc,unit);
 579 #ifdef DCL_DEBUG
 580         if (UDP->flags & FD_DEBUG){
 581                 DPRINT("calling disk change from set_dor\n");
 582         }
 583 #endif
 584                         disk_change(drive);
 585                 }
 586                 FDCS->dor = newdor;
 587                 outb_p(newdor, FD_DOR);
 588 
 589                 unit = newdor & 0x3;
 590                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 591                         drive = REVDRIVE(fdc,unit);
 592                         UDRS->select_date = jiffies;
 593                 }
 594         }
 595         if ( newdor & 0xf0 )
 596                 floppy_grab_irq_and_dma();
 597         if( olddor & 0xf0 )
 598                 floppy_release_irq_and_dma();
 599         return olddor;
 600 }
 601 
 602 static void twaddle(void)
     /*  */
 603 {
 604         if (DP->select_delay)
 605                 return;
 606         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 607         outb_p(FDCS->dor, FD_DOR);
 608         DRS->select_date = jiffies;
 609 }
 610 
 611 /* reset all driver information about the current fdc. This is needed after
 612  * a reset, and after a raw command. */
 613 static void reset_fdc_info(int mode)
     /*  */
 614 {
 615         int drive;
 616 
 617         FDCS->spec1 = FDCS->spec2 = -1;
 618         FDCS->need_configure = 1;
 619         FDCS->perp_mode = 1;
 620         FDCS->rawcmd = 0;
 621         for ( drive = 0; drive < N_DRIVE; drive++)
 622                 if (FDC(drive) == fdc &&
 623                     ( mode || UDRS->track != NEED_1_RECAL))
 624                         UDRS->track = NEED_2_RECAL;
 625 }
 626 
 627 /* selects the fdc and drive, and enables the fdc's input/dma. */
 628 static void set_fdc(int drive)
     /*  */
 629 {
 630         if (drive >= 0 && drive < N_DRIVE){
 631                 fdc = FDC(drive);
 632                 current_drive = drive;
 633         }
 634         set_dor(fdc,~0,8);
 635 #ifdef CONFIG_FLOPPY_2_FDC
 636         set_dor(1-fdc, ~8, 0);
 637 #endif
 638         if ( FDCS->rawcmd == 2 )
 639                 reset_fdc_info(1);
 640         if( inb_p(FD_STATUS) != STATUS_READY )
 641                 FDCS->reset = 1;
 642 }
 643 
 644 /* locks the driver */
 645 static int lock_fdc(int drive, int interruptible)
     /*  */
 646 {
 647         if(!usage_count){
 648                 printk("trying to lock fdc while usage count=0\n");
 649                 return -1;
 650         }
 651         floppy_grab_irq_and_dma();
 652         if (!current->pid)
 653                 run_task_queue(&tq_timer);
 654         cli();
 655         while (fdc_busy && NO_SIGNAL)
 656                 interruptible_sleep_on(&fdc_wait);
 657         if(fdc_busy){
 658                 sti();
 659                 return -EINTR;
 660         }
 661         fdc_busy = 1;
 662         sti();
 663         command_status = FD_COMMAND_NONE;
 664         set_fdc(drive);
 665         return 0;
 666 }
 667 
 668 #define LOCK_FDC(drive,interruptible) \
 669 if(lock_fdc(drive,interruptible)) return -EINTR;
 670 
 671 typedef void (*timeout_fn)(unsigned long);
 672 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0, 
 673                                                (timeout_fn) floppy_shutdown };
 674 
 675 /* unlocks the driver */
 676 static inline void unlock_fdc(void)
     /*  */
 677 {
 678         if (!fdc_busy)
 679                 DPRINT("FDC access conflict!\n");
 680 
 681         if ( DEVICE_INTR )
 682                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 683                         DEVICE_INTR);
 684         command_status = FD_COMMAND_NONE;
 685         del_timer(&fd_timeout);
 686         fdc_busy = 0;
 687         floppy_release_irq_and_dma();
 688         wake_up(&fdc_wait);
 689 }
 690 
 691 /* switches the motor off after a given timeout */
 692 static void motor_off_callback(unsigned long nr)
     /*  */
 693 {
 694         unsigned char mask = ~(0x10 << UNIT(nr));
 695 
 696         set_dor( FDC(nr), mask, 0 );
 697 }
 698 
 699 static struct timer_list motor_off_timer[N_DRIVE] = {
 700         { NULL, NULL, 0, 0, motor_off_callback },
 701         { NULL, NULL, 0, 1, motor_off_callback },
 702         { NULL, NULL, 0, 2, motor_off_callback },
 703         { NULL, NULL, 0, 3, motor_off_callback }
 704 #ifdef CONFIG_FLOPPY_2_FDC
 705         ,
 706         { NULL, NULL, 0, 4, motor_off_callback },
 707         { NULL, NULL, 0, 5, motor_off_callback },
 708         { NULL, NULL, 0, 6, motor_off_callback },
 709         { NULL, NULL, 0, 7, motor_off_callback }
 710 #endif
 711 };
 712 
 713 /* schedules motor off */
 714 static void floppy_off(unsigned int drive)
     /*  */
 715 {
 716         unsigned long volatile delta;
 717         register int fdc=FDC(drive);
 718 
 719         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 720                 return;
 721 
 722         del_timer(motor_off_timer+drive);
 723 
 724         /* make spindle stop in a position which minimizes spinup time
 725          * next time */
 726         if (UDP->rps ){
 727                 delta = jiffies - UDRS->first_read_date + HZ -
 728                         UDP->spindown_offset;
 729                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 730                 motor_off_timer[drive].expires = UDP->spindown - delta;
 731         }
 732         add_timer(motor_off_timer+drive);
 733 }
 734 
 735 /*
 736  * cycle through all N_DRIVE floppy drives, for disk change testing.
 737  * stopping at current drive. This is done before any long operation, to
 738  * be sure to have up to date disk change information.
 739  */
 740 static void scandrives(void)
     /*  */
 741 {
 742         int i, drive, saved_drive;
 743         
 744         if (DP->select_delay)
 745                 return;
 746 
 747         saved_drive = current_drive;
 748         for(i=0; i< N_DRIVE; i++){
 749                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 750                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 751                         continue; /* skip closed drives */
 752                 set_fdc(drive);
 753                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 754                       (0x10 << UNIT(drive))))
 755                         /* switch the motor off again, if it was off to
 756                          * begin with */
 757                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 758         }
 759         set_fdc(saved_drive);
 760 }
 761 
 762 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 763 
 764 /* this function makes sure that the disk stays in the drive during the
 765  * transfer */
 766 static void fd_watchdog(void)
     /*  */
 767 {
 768 #ifdef DCL_DEBUG
 769         if (DP->flags & FD_DEBUG){
 770                 DPRINT("calling disk change from watchdog\n");
 771         }
 772 #endif
 773 
 774         if ( disk_change(current_drive) ){
 775                 DPRINT("disk removed during i/o\n");
 776                 floppy_shutdown();
 777         } else {                
 778                 del_timer(&fd_timer);
 779                 fd_timer.function = (timeout_fn) fd_watchdog;
 780                 fd_timer.expires = 10;
 781                 add_timer(&fd_timer);
 782         }
 783 }
 784 
 785 static void main_command_interrupt(void)
     /*  */
 786 {
 787         del_timer(&fd_timer);
 788         cont->interrupt();
 789 }
 790 
 791 /* waits for a delay (spinup or select) to pass */
 792 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 793 {
 794         if ( FDCS->reset ){
 795                 reset_fdc(); /* do the reset during sleep to win time
 796                               * if we don't need to sleep, it's a good
 797                               * occasion anyways */
 798                 return 1;
 799         }
 800 
 801         if ( jiffies < delay ){
 802                 del_timer(&fd_timer);
 803                 fd_timer.function = function;
 804                 fd_timer.expires = delay  - jiffies;
 805                 add_timer(&fd_timer);
 806                 return 1;
 807         }
 808         return 0;
 809 }
 810 
 811 static void setup_DMA(void)
     /*  */
 812 {
 813 #ifdef CONFIG_FLOPPY_SANITY
 814         if ((!CURRENT ||
 815              CURRENT->buffer != current_addr ||
 816              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 817             (current_addr < floppy_track_buffer ||
 818              current_addr + raw_cmd.length >
 819              floppy_track_buffer + 1024 * max_buffer_sectors)){
 820                 printk("bad address. start=%p lg=%lx tb=%p\n",
 821                        current_addr, raw_cmd.length, floppy_track_buffer);
 822                 if ( CURRENT ){
 823                         printk("buffer=%p nr=%lx cnr=%lx\n",
 824                                CURRENT->buffer, CURRENT->nr_sectors,
 825                                CURRENT->current_nr_sectors);
 826                 }
 827                 cont->done(0);
 828                 FDCS->reset=1;
 829                 return;
 830         }
 831         if ((long) current_addr % 512 ){
 832                 printk("non aligned address: %p\n", current_addr );
 833                 cont->done(0);
 834                 FDCS->reset=1;
 835                 return;
 836         }
 837         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 838             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 839                 printk("DMA crossing 64-K boundary %p-%p\n",
 840                        current_addr, current_addr + raw_cmd.length);
 841                 cont->done(0);
 842                 FDCS->reset=1;
 843                 return;
 844         }
 845 
 846 #endif
 847         cli();
 848         disable_dma(FLOPPY_DMA);
 849         clear_dma_ff(FLOPPY_DMA);
 850         set_dma_mode(FLOPPY_DMA,
 851                      (raw_cmd.flags & FD_RAW_READ)?
 852                      DMA_MODE_READ : DMA_MODE_WRITE);
 853         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 854         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 855         enable_dma(FLOPPY_DMA);
 856         sti();
 857 }
 858 
 859 /* sends a command byte to the fdc */
 860 static int output_byte(char byte)
     /*  */
 861 {
 862         int counter;
 863         unsigned char status;
 864 
 865         if (FDCS->reset)
 866                 return -1;
 867         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 868                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 869                 if (!(status & STATUS_READY))
 870                         continue;
 871                 if (status == STATUS_READY){
 872                         outb_p(byte,FD_DATA);
 873                         return 0;
 874                 } else
 875                         break;
 876         }
 877         FDCS->reset = 1;
 878         if ( !initialising )
 879                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
 880                         byte, status);
 881         return -1;
 882 }
 883 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 884 
 885 /* gets the response from the fdc */
 886 static int result(void)
     /*  */
 887 {
 888         int i = 0, counter, status;
 889 
 890         if (FDCS->reset)
 891                 return -1;
 892         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 893                 status = inb_p(FD_STATUS)&
 894                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 895                 if (!(status & STATUS_READY))
 896                         continue;
 897                 if (status == STATUS_READY)
 898                         return i;
 899                 if (status & STATUS_DMA )
 900                         break;
 901                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 902                         if (i >= MAX_REPLIES) {
 903                                 DPRINT("floppy_stat reply overrun\n");
 904                                 break;
 905                         }
 906                         reply_buffer[i++] = inb_p(FD_DATA);
 907                 }
 908         }
 909         FDCS->reset = 1;
 910         if ( !initialising )
 911                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
 912                         status, fdc, i);
 913         return -1;
 914 }
 915 
 916 /* Set perpendicular mode as required, based on data rate, if supported.
 917  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 918  */
 919 static inline void perpendicular_mode(void)
     /*  */
 920 {
 921         unsigned char perp_mode;
 922 
 923         if (!floppy)
 924                 return;
 925         if (floppy->rate & 0x40){
 926                 switch(raw_cmd.rate){
 927                 case 0:
 928                         perp_mode=2;
 929                         break;
 930                 case 3:
 931                         perp_mode=3;
 932                         break;
 933                 default:
 934                         DPRINT("Invalid data rate for perpendicular mode!\n");
 935                         cont->done(0);
 936                         FDCS->reset = 1; /* convenient way to return to
 937                                           * redo without to much hassle (deep
 938                                           * stack et al. */
 939                         return;
 940                 }
 941         } else
 942                 perp_mode = 0;
 943                         
 944         if ( FDCS->perp_mode == perp_mode )
 945                 return;
 946         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 947                 output_byte(FD_PERPENDICULAR);
 948                 output_byte(perp_mode);
 949                 FDCS->perp_mode = perp_mode;
 950         } else if (perp_mode) {
 951                 DPRINT("perpendicular mode not supported by this FDC.\n");
 952         }
 953 } /* perpendicular_mode */
 954 
 955 #define NOMINAL_DTR 500
 956 
 957 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
 958  * head load time, and DMA disable flag to values needed by floppy.
 959  *
 960  * The value "dtr" is the data transfer rate in Kbps.  It is needed
 961  * to account for the data rate-based scaling done by the 82072 and 82077
 962  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 963  * 8272a).
 964  *
 965  * Note that changing the data transfer rate has a (probably deleterious)
 966  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 967  * fdc_specify is called again after each data transfer rate
 968  * change.
 969  *
 970  * srt: 1000 to 16000 in microseconds
 971  * hut: 16 to 240 milliseconds
 972  * hlt: 2 to 254 milliseconds
 973  *
 974  * These values are rounded up to the next highest available delay time.
 975  */
 976 static void fdc_specify(void)
     /*  */
 977 {
 978         unsigned char spec1, spec2;
 979         int srt, hlt, hut;
 980         unsigned long dtr = NOMINAL_DTR;
 981         unsigned long scale_dtr = NOMINAL_DTR;
 982         int hlt_max_code = 0x7f;
 983         int hut_max_code = 0xf;
 984 
 985         if (FDCS->need_configure && FDCS->has_fifo) {
 986                 if ( FDCS->reset )
 987                         return;
 988                 /* Turn on FIFO for 82077-class FDC (improves performance) */
 989                 /* TODO: lock this in via LOCK during initialization */
 990                 output_byte(FD_CONFIGURE);
 991                 output_byte(0);
 992                 output_byte(0x1A);      /* FIFO on, polling off, 10 byte threshold */
 993                 output_byte(0);         /* precompensation from track 0 upwards */
 994                 if ( FDCS->reset ){
 995                         FDCS->has_fifo=0;
 996                         return;
 997                 }
 998                 FDCS->need_configure = 0;
 999                 /*DPRINT("FIFO enabled\n");*/
1000         }
1001 
1002         switch (raw_cmd.rate & 0x03) {
1003         case 3:
1004                 dtr = 1000;
1005                 break;
1006         case 1:
1007                 dtr = 300;
1008                 break;
1009         case 2:
1010                 dtr = 250;
1011                 break;
1012         }
1013 
1014         if (FDCS->version >= FDC_82072) {
1015                 scale_dtr = dtr;
1016                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1017                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1018         }
1019 
1020         /* Convert step rate from microseconds to milliseconds and 4 bits */
1021         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1022         if (srt > 0xf)
1023                 srt = 0xf;
1024         else if (srt < 0)
1025                 srt = 0;
1026 
1027         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1028         if (hlt < 0x01)
1029                 hlt = 0x01;
1030         else if (hlt > 0x7f)
1031                 hlt = hlt_max_code;
1032 
1033         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1034         if (hut < 0x1)
1035                 hut = 0x1;
1036         else if (hut > 0xf)
1037                 hut = hut_max_code;
1038 
1039         spec1 = (srt << 4) | hut;
1040         spec2 = (hlt << 1);
1041 
1042         /* If these parameters did not change, just return with success */
1043         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1044                 /* Go ahead and set spec1 and spec2 */
1045                 output_byte(FD_SPECIFY);
1046                 output_byte(FDCS->spec1 = spec1);
1047                 output_byte(FDCS->spec2 = spec2);
1048         }
1049 } /* fdc_specify */
1050 
1051 /* Set the FDC's data transfer rate on behalf of the specified drive.
1052  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1053  * of the specify command (i.e. using the fdc_specify function).
1054  */
1055 static int fdc_dtr(void)
     /*  */
1056 {
1057         /* If data rate not already set to desired value, set it. */
1058         if ( raw_cmd.rate == FDCS->dtr)
1059                 return 0;
1060         
1061         /* Set dtr */
1062         outb_p(raw_cmd.rate, FD_DCR);
1063         
1064         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1065          * need a stabilization period of several milliseconds to be
1066          * enforced after data rate changes before R/W operations.
1067          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1068          */
1069         FDCS->dtr = raw_cmd.rate;
1070         return(wait_for_completion(jiffies+2,
1071                                    (timeout_fn) floppy_ready));
1072 } /* fdc_dtr */
1073 
1074 static void tell_sector(void)
     /*  */
1075 {
1076         printk(": track %d, head %d, sector %d, size %d",
1077                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1078 } /* tell_sector */
1079 
1080 
1081 /*
1082  * Ok, this error interpreting routine is called after a
1083  * DMA read/write has succeeded
1084  * or failed, so we check the results, and copy any buffers.
1085  * hhb: Added better error reporting.
1086  * ak: Made this into a separate routine.
1087  */
1088 static int interpret_errors(void)
     /*  */
1089 {
1090         char bad;
1091 
1092         if (inr!=7) {
1093                 DPRINT("-- FDC reply error");
1094                 FDCS->reset = 1;
1095                 return 1;
1096         }
1097 
1098         /* check IC to find cause of interrupt */
1099         switch ((ST0 & ST0_INTR)>>6) {
1100                 case 1: /* error occurred during command execution */
1101                         bad = 1;
1102                         if (ST1 & ST1_WP) {
1103                                 DPRINT("Drive is write protected\n");
1104                                 CLEARF(FD_DISK_WRITABLE);
1105                                 cont->done(0);
1106                                 bad = 2;
1107                         } else if (ST1 & ST1_ND) {
1108                                 SETF(FD_NEED_TWADDLE);
1109                         } else if (ST1 & ST1_OR) {
1110                                 if (DP->flags & FTD_MSG )
1111                                         DPRINT("Over/Underrun - retrying\n");
1112                                 bad = 0;
1113                         }else if(*errors >= DP->max_errors.reporting){
1114                                 DPRINT("");
1115                                 if (ST0 & ST0_ECE) {
1116                                         printk("Recalibrate failed!");
1117                                 } else if (ST2 & ST2_CRC) {
1118                                         printk("data CRC error");
1119                                         tell_sector();
1120                                 } else if (ST1 & ST1_CRC) {
1121                                         printk("CRC error");
1122                                         tell_sector();
1123                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1124                                         if (!probing) {
1125                                                 printk("sector not found");
1126                                                 tell_sector();
1127                                         } else
1128                                                 printk("probe failed...");
1129                                 } else if (ST2 & ST2_WC) {      /* seek error */
1130                                         printk("wrong cylinder");
1131                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1132                                         printk("bad cylinder");
1133                                 } else {
1134                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1135                                         tell_sector();
1136                                 }
1137                                 printk("\n");
1138 
1139                         }
1140                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1141                                 /* wrong cylinder => recal */
1142                                 DRS->track = NEED_2_RECAL;
1143                         return bad;
1144                 case 2: /* invalid command given */
1145                         DPRINT("Invalid FDC command given!\n");
1146                         cont->done(0);
1147                         return 2;
1148                 case 3:
1149                         DPRINT("Abnormal termination caused by polling\n");
1150                         cont->error();
1151                         return 2;
1152                 default: /* (0) Normal command termination */
1153                         return 0;
1154         }
1155 }
1156 
1157 /*
1158  * This routine is called when everything should be correctly set up
1159  * for the transfer (ie floppy motor is on, the correct floppy is
1160  * selected, and the head is sitting on the right track).
1161  */
1162 static void setup_rw_floppy(void)
     /*  */
1163 {
1164         int i,ready_date,r, flags,dflags;
1165         timeout_fn function;
1166 
1167         flags = raw_cmd.flags;
1168         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1169                 flags |= FD_RAW_INTR;
1170 
1171         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1172                 ready_date = DRS->spinup_date + DP->spinup;             
1173                 /* If spinup will take a long time, rerun scandrives
1174                  * again just before spinup completion. Beware that
1175                  * after scandrives, we must again wait for selection.
1176                  */
1177                 if ( ready_date > jiffies + DP->select_delay){
1178                         ready_date -= DP->select_delay;
1179                         function = (timeout_fn) floppy_start;
1180                 } else
1181                         function = (timeout_fn) setup_rw_floppy;
1182 
1183                 /* wait until the floppy is spinning fast enough */
1184                 if (wait_for_completion(ready_date,function))
1185                         return;
1186         }
1187         dflags = DRS->flags;
1188 
1189         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1190                 setup_DMA();
1191         
1192         if ( flags & FD_RAW_INTR )
1193                 SET_INTR(main_command_interrupt);
1194 
1195         r=0;
1196         for(i=0; i< raw_cmd.cmd_count; i++)
1197                 r|=output_byte( raw_cmd.cmd[i] );
1198 
1199 #ifdef DEBUGT
1200         debugt("rw_command: ");
1201 #endif
1202         if ( r ){
1203                 reset_fdc();
1204                 return;
1205         }
1206 
1207         if ( ! ( flags & FD_RAW_INTR )){
1208                 inr = result();
1209                 cont->interrupt();
1210         } else if ( flags & FD_RAW_NEED_DISK )
1211                 fd_watchdog();
1212 }
1213 
1214 static int blind_seek;
1215 
1216 /*
1217  * This is the routine called after every seek (or recalibrate) interrupt
1218  * from the floppy controller.
1219  */
1220 static void seek_interrupt(void)
     /*  */
1221 {
1222 #ifdef DEBUGT
1223         debugt("seek interrupt:");
1224 #endif
1225         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1226                 DPRINT("seek failed\n");
1227                 DRS->track = NEED_2_RECAL;
1228                 cont->error();
1229                 cont->redo();
1230                 return;
1231         }
1232         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1233 #ifdef DCL_DEBUG
1234                 if (DP->flags & FD_DEBUG){
1235                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1236                         DPRINT1("jiffies=%ld\n", jiffies);
1237                 }
1238 #endif
1239                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1240                 DRS->select_date = jiffies;
1241         }
1242         DRS->track = ST1;
1243         floppy_ready();
1244 }
1245 
1246 static void check_wp(void)
     /*  */
1247 {
1248         if (TESTF(FD_VERIFY)) {
1249                 /* check write protection */
1250                 output_byte( FD_GETSTATUS );
1251                 output_byte( UNIT(current_drive) );
1252                 if ( result() != 1 ){
1253                         FDCS->reset = 1;
1254                         return;
1255                 }
1256                 CLEARF(FD_VERIFY);
1257                 CLEARF(FD_NEED_TWADDLE);
1258 #ifdef DCL_DEBUG
1259                 if (DP->flags & FD_DEBUG){
1260                         DPRINT("checking whether disk is write protected\n");
1261                         DPRINT1("wp=%x\n",ST3 & 0x40);
1262                 }
1263 #endif
1264                 if (!( ST3  & 0x40))
1265                         SETF(FD_DISK_WRITABLE);
1266                 else
1267                         CLEARF(FD_DISK_WRITABLE);
1268         }
1269 }
1270 
1271 static void seek_floppy(void)
     /*  */
1272 {
1273         int track;
1274 
1275         blind_seek=0;
1276 
1277 #ifdef DCL_DEBUG
1278         if (DP->flags & FD_DEBUG){
1279                 DPRINT("calling disk change from seek\n");
1280         }
1281 #endif
1282 
1283         if (!TESTF(FD_DISK_NEWCHANGE) &&
1284             disk_change(current_drive) &&
1285             (raw_cmd.flags & FD_RAW_NEED_DISK)){
1286                 /* the media changed flag should be cleared after the seek.
1287                  * If it isn't, this means that there is really no disk in
1288                  * the drive.
1289                  */
1290                 SETF(FD_DISK_CHANGED);
1291                 cont->done(0);
1292                 cont->redo();
1293                 return;
1294         }
1295         if ( DRS->track <= NEED_1_RECAL ){
1296                 recalibrate_floppy();
1297                 return;
1298         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1299                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1300                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1301                 /* we seek to clear the media-changed condition. Does anybody
1302                  * know a more elegant way, which works on all drives? */
1303                 if ( raw_cmd.track )
1304                         track = raw_cmd.track - 1;
1305                 else {
1306                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1307                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1308                                 blind_seek = 1;
1309                                 raw_cmd.flags |= FD_RAW_NEED_SEEK;
1310                         }
1311                         track = 1;
1312                 }
1313         } else {
1314                 check_wp();
1315                 if (raw_cmd.track != DRS->track &&
1316                     (raw_cmd.flags & FD_RAW_NEED_SEEK))
1317                         track = raw_cmd.track;
1318                 else {
1319                         setup_rw_floppy();
1320                         return;
1321                 }
1322         }
1323 
1324         SET_INTR(seek_interrupt);
1325         output_byte(FD_SEEK);
1326         output_byte(UNIT(current_drive));
1327         LAST_OUT(track);
1328 #ifdef DEBUGT
1329         debugt("seek command:");
1330 #endif
1331 }
1332 
1333 static void recal_interrupt(void)
     /*  */
1334 {
1335 #ifdef DEBUGT
1336         debugt("recal interrupt:");
1337 #endif
1338         if (inr !=2 )
1339                 FDCS->reset = 1;
1340         else if (ST0 & ST0_ECE) {
1341                 switch(DRS->track){
1342                 case NEED_1_RECAL:
1343 #ifdef DEBUGT
1344                         debugt("recal interrupt need 1 recal:");
1345 #endif
1346                         /* after a second recalibrate, we still haven't
1347                          * reached track 0. Probably no drive. Raise an
1348                          * error, as failing immediately might upset 
1349                          * computers possessed by the Devil :-) */
1350                         cont->error();
1351                         cont->redo();
1352                         return;
1353                 case NEED_2_RECAL:
1354 #ifdef DEBUGT
1355                         debugt("recal interrupt need 2 recal:");
1356 #endif
1357                         /* If we already did a recalibrate, and we are not at
1358                          * track 0, this means we have moved. (The only way
1359                          * not to move at recalibration is to be already at
1360                          * track 0.) Clear the new change flag
1361                          */
1362 #ifdef DCL_DEBUG
1363                         if (DP->flags & FD_DEBUG){
1364                                 DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1365                         }
1366 #endif
1367 
1368                         CLEARF(FD_DISK_NEWCHANGE);
1369                         DRS->select_date = jiffies;
1370                         /* fall through */
1371                 default:
1372 #ifdef DEBUGT
1373                         debugt("recal interrupt default:");
1374 #endif
1375                         /* Recalibrate moves the head by at most 80 steps. If
1376                          * after one recalibrate we don't have reached track
1377                          * 0, this might mean that we started beyond track 80.
1378                          * Try again.
1379                          */
1380                         DRS->track = NEED_1_RECAL;
1381                         break;
1382                 }
1383         } else
1384                 DRS->track = ST1;
1385         floppy_ready();
1386 }
1387 
1388 /*
1389  * Unexpected interrupt - Print as much debugging info as we can...
1390  * All bets are off...
1391  */
1392 static void unexpected_floppy_interrupt(void)
     /*  */
1393 {
1394         int i;
1395         if ( initialising )
1396                 return;
1397         DPRINT("unexpected interrupt\n");
1398         if ( inr >= 0 )
1399                 for(i=0; i<inr; i++)
1400                         printk("%d %x\n", i, reply_buffer[i] );
1401         while(1){
1402                 output_byte(FD_SENSEI);
1403                 inr=result();
1404                 if ( inr != 2 )
1405                         break;
1406                 printk("sensei\n");
1407                 for(i=0; i<inr; i++)
1408                         printk("%d %x\n", i, reply_buffer[i] );
1409         }
1410         FDCS->reset = 1;
1411 }
1412 
1413 struct tq_struct floppy_tq = 
1414 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1415 
1416 /* interrupt handler */
1417 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1418 {
1419         void (*handler)(void) = DEVICE_INTR;
1420 
1421         CLEAR_INTR;
1422         if ( fdc >= N_FDC || FDCS->address == -1){
1423                 /* we don't even know which FDC is the culprit */
1424                 printk("DOR0=%x\n", fdc_state[0].dor);
1425                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1426                 printk("handler=%p\n", handler);
1427                 return;
1428         }
1429         inr = result();
1430         if (!handler){
1431                 unexpected_floppy_interrupt();
1432                 return;
1433         }
1434         if ( inr == 0 ){
1435                 do {
1436                         output_byte(FD_SENSEI);
1437                         inr = result();
1438                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1439         }
1440         floppy_tq.routine = (void *)(void *) handler;
1441         queue_task_irq(&floppy_tq, &tq_timer);
1442 }
1443 
1444 static void recalibrate_floppy(void)
     /*  */
1445 {
1446 #ifdef DEBUGT
1447         debugt("recalibrate floppy:");
1448 #endif
1449         SET_INTR(recal_interrupt);
1450         output_byte(FD_RECALIBRATE);
1451         LAST_OUT(UNIT(current_drive));
1452 }
1453 
1454 /*
1455  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1456  */
1457 static void reset_interrupt(void)
     /*  */
1458 {
1459 #ifdef DEBUGT
1460         debugt("reset interrupt:");
1461 #endif
1462         fdc_specify();          /* reprogram fdc */
1463         result();               /* get the status ready for set_fdc */
1464         if ( FDCS->reset )
1465                 cont->error(); /* a reset just after a reset. BAD! */
1466         cont->redo();
1467 }
1468 
1469 /*
1470  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1471  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1472  */
1473 static void reset_fdc(void)
     /*  */
1474 {
1475         SET_INTR(reset_interrupt);
1476         FDCS->reset = 0;
1477         reset_fdc_info(0);
1478         if ( FDCS->version >= FDC_82077 )
1479                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1480         else {
1481                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1482                 udelay(FD_RESET_DELAY);
1483                 outb(FDCS->dor, FD_DOR);
1484         }
1485 }
1486 
1487 static void empty(void)
     /*  */
1488 {
1489 }
1490 
1491 void show_floppy(void)
     /*  */
1492 {
1493         int i;
1494 
1495         printk("\n");
1496         printk("floppy driver state\n");
1497         printk("-------------------\n");
1498         for(i=0; i<N_FDC; i++){
1499                 if(FDCS->address != -1){
1500                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1501                         outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1502                         udelay(1000); /* maybe we'll catch an interrupt... */
1503                 }
1504         }
1505         printk("status=%x\n", inb_p(FD_STATUS));
1506         printk("fdc_busy=%d\n", fdc_busy);
1507         if( DEVICE_INTR)
1508                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1509         if(floppy_tq.sync)
1510                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1511         if(fd_timer.prev)
1512                 printk("fd_timer.function=%p\n", fd_timer.function);
1513         if(fd_timeout.prev){
1514                 printk("timer_table=%p\n",fd_timeout.function);
1515                 printk("expires=%ld\n",fd_timeout.expires);
1516                 printk("now=%ld\n",jiffies);
1517         }
1518         printk("cont=%p\n", cont);
1519         printk("CURRENT=%p\n", CURRENT);
1520         printk("command_status=%d\n", command_status);
1521         printk("\n");
1522 }
1523 
1524 static void floppy_shutdown(void)
     /*  */
1525 {
1526         CLEAR_INTR;
1527         floppy_tq.routine = (void *)(void *) empty;
1528         del_timer( &fd_timer);
1529 
1530         disable_dma(FLOPPY_DMA);
1531         /* avoid dma going to a random drive after shutdown */
1532 
1533         if(!initialising)
1534                 DPRINT("floppy timeout\n");
1535         FDCS->reset = 1;
1536         cont->done(0);
1537         cont->redo(); /* this will recall reset when needed */
1538 }
1539 /*typedef void (*timeout_fn)(unsigned long);*/
1540 
1541 /* start motor, check media-changed condition and write protection */
1542 static int start_motor( void (*function)(void)  )
     /*  */
1543 {
1544         int mask, data;
1545 
1546         mask = 0xfc;
1547         data = UNIT(current_drive);
1548         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1549                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1550                         set_debugt();
1551                         /* no read since this drive is running */
1552                         DRS->first_read_date = 0;
1553                         /* note motor start time if motor is not yet running */
1554                         DRS->spinup_date = jiffies;
1555                         data |= (0x10 << UNIT(current_drive));
1556                 }
1557         } else
1558                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1559                         mask &= ~(0x10 << UNIT(current_drive));
1560 
1561         /* starts motor and selects floppy */
1562         del_timer(motor_off_timer + current_drive);
1563         set_dor( fdc, mask, data);
1564 
1565         /* wait_for_completion also schedules reset if needed. */
1566         return(wait_for_completion(DRS->select_date+DP->select_delay,
1567                                    (timeout_fn) function));
1568 }
1569 
1570 static void floppy_ready(void)
     /*  */
1571 {
1572         CHECK_RESET;
1573         if(start_motor(floppy_ready)) return;
1574         if(fdc_dtr()) return;
1575 
1576 #ifdef DCL_DEBUG
1577         if (DP->flags & FD_DEBUG){
1578                 DPRINT("calling disk change from floppy_ready\n");
1579         }
1580 #endif
1581 
1582         if(!(raw_cmd.flags & FD_RAW_NO_MOTOR) &&
1583            disk_change(current_drive) &&
1584            !DP->select_delay)
1585                 twaddle(); /* this clears the dcl on certain drive/controller
1586                             * combinations */
1587 
1588         if ( raw_cmd.flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1589                 perpendicular_mode();
1590                 fdc_specify(); /* must be done here because of hut, hlt ... */
1591                 seek_floppy();
1592         } else
1593                 setup_rw_floppy();
1594 }
1595 
1596 static void floppy_start(void)
     /*  */
1597 {
1598         del_timer(&fd_timeout);
1599         fd_timeout.expires = DP->timeout;
1600         add_timer(&fd_timeout);
1601 
1602         scandrives();
1603 #ifdef DCL_DEBUG
1604                 if (DP->flags & FD_DEBUG){
1605                         DPRINT("setting NEWCHANGE in floppy_start\n");
1606                 }
1607 #endif
1608         SETF(FD_DISK_NEWCHANGE);
1609         floppy_ready();
1610 }
1611 
1612 /*
1613  * ========================================================================
1614  * here ends the bottom half. Exported routines are:
1615   * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1616  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1617  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1618  * and set_dor.
1619  * ========================================================================
1620  */
1621 /*
1622  * General purpose continuations.
1623  * ==============================
1624  */
1625 
1626 static void do_wakeup(void)
     /*  */
1627 {
1628         del_timer(&fd_timeout);
1629         cont = 0;
1630         command_status += 2;
1631         wake_up(&command_done);
1632 }
1633 
1634 static struct cont_t wakeup_cont={
1635         empty,
1636         do_wakeup,
1637         empty,
1638         (done_f)empty
1639 };
1640 
1641 static int wait_til_done( void (*handler)(void ), int interruptible )
     /*  */
1642 {
1643         int ret;
1644 
1645         floppy_tq.routine = (void *)(void *) handler;
1646         queue_task(&floppy_tq, &tq_timer);
1647 
1648         cli();
1649         while(command_status < 2 && NO_SIGNAL)
1650                 if (current->pid)
1651                         interruptible_sleep_on(&command_done);
1652                 else {
1653                         sti();
1654                         run_task_queue(&tq_timer);
1655                         cli();
1656                 }
1657         if(command_status < 2){
1658                 sti();
1659                 floppy_shutdown();
1660                 process_fd_request();
1661                 return -EINTR;
1662         }
1663         sti();
1664 
1665         if ( FDCS->reset )
1666                 command_status = FD_COMMAND_ERROR;
1667         if ( command_status == FD_COMMAND_OKAY )
1668                 ret=0;
1669         else
1670                 ret=-EIO;
1671         command_status = FD_COMMAND_NONE;
1672         return ret;
1673 }
1674 
1675 static void generic_done(int result)
     /*  */
1676 {
1677         command_status = result;
1678         cont = &wakeup_cont;
1679 }
1680 
1681 static void generic_success(void)
     /*  */
1682 {
1683         generic_done(1);
1684 }
1685 
1686 static void generic_failure(void)
     /*  */
1687 {
1688         generic_done(0);
1689 }
1690 
1691 static void success_and_wakeup(void)
     /*  */
1692 {
1693         generic_success();
1694         do_wakeup();
1695 }
1696 
1697 static void failure_and_wakeup(void)
     /*  */
1698 {
1699         generic_failure();
1700         do_wakeup();
1701 }
1702 
1703 /*
1704  * formatting and rw support.
1705  * ==========================
1706  */
1707 
1708 static int next_valid_format(void)
     /*  */
1709 {
1710         int probed_format;
1711         while(1){
1712                 probed_format = DRS->probed_format;
1713                 if ( probed_format > N_DRIVE ||
1714                     ! DP->autodetect[probed_format] ){
1715                         DRS->probed_format = 0;
1716                         return 1;
1717                 }
1718                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1719                         DRS->probed_format = probed_format;
1720                         return 0;
1721                 }
1722                 probed_format++;
1723         }
1724 }
1725 
1726 static void bad_flp_intr(void)
     /*  */
1727 {
1728         if ( probing ){
1729                 DRS->probed_format++;
1730                 if ( !next_valid_format())
1731                         return;
1732         }
1733         (*errors)++;
1734         if (*errors > DRWE->badness)
1735                 DRWE->badness = *errors;
1736         if (*errors > DP->max_errors.abort)
1737                 cont->done(0);
1738         if (*errors > DP->max_errors.reset)
1739                 FDCS->reset = 1;
1740         else if (*errors > DP->max_errors.recal)
1741                 DRS->track = NEED_2_RECAL;
1742 }
1743 
1744 static void set_floppy(int device)
     /*  */
1745 {
1746         if (TYPE(device))
1747                 floppy = TYPE(device) + floppy_type;
1748         else
1749                 floppy = current_type[ DRIVE(device) ];
1750 }
1751 
1752 /*
1753  * formatting and support.
1754  * =======================
1755  */
1756 static void format_interrupt(void)
     /*  */
1757 {
1758         switch (interpret_errors()){
1759         case 1:
1760                 cont->error();
1761         case 2:
1762                 break;
1763         case 0:
1764                 cont->done(1);
1765         }
1766         cont->redo();
1767 }
1768 
1769 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
1770 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
1771 #define CT(x) ( (x) | 0x40 )
1772 static void setup_format_params(void)
     /*  */
1773 {
1774         struct fparm {
1775                 unsigned char track,head,sect,size;
1776         } *here = (struct fparm *)floppy_track_buffer;
1777         int il,n;
1778         int count,head_shift,track_shift;
1779 
1780         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1781                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1782         raw_cmd.rate = floppy->rate & 0x3;
1783         raw_cmd.cmd_count = NR_F;
1784         COMMAND = FM_MODE(floppy,FD_FORMAT);
1785         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1786         F_SIZECODE = FD_SIZECODE(floppy);
1787         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1788         F_GAP = floppy->fmt_gap;
1789         F_FILL = FD_FILL_BYTE;
1790 
1791         current_addr = floppy_track_buffer;
1792         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1793 
1794         /* allow for about 30ms for data transport per track */
1795         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1796 
1797         /* a ``cylinder'' is two tracks plus a little stepping time */
1798         track_shift = 2 * head_shift + 1;
1799 
1800         /* position of logical sector 1 on this track */
1801         n = (track_shift * format_req.track + head_shift * format_req.head )
1802                 % F_SECT_PER_TRACK;
1803 
1804         /* determine interleave */
1805         il = 1;
1806         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
1807                 il++;
1808 
1809         /* initialize field */
1810         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1811                 here[count].track = format_req.track;
1812                 here[count].head = format_req.head;
1813                 here[count].sect = 0;
1814                 here[count].size = F_SIZECODE;
1815         }
1816         /* place logical sectors */
1817         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1818                 here[n].sect = count;
1819                 n = (n+il) % F_SECT_PER_TRACK;
1820                 if (here[n].sect) { /* sector busy, find next free sector */
1821                         ++n;
1822                         if (n>= F_SECT_PER_TRACK) {
1823                                 n-=F_SECT_PER_TRACK;
1824                                 while (here[n].sect) ++n;
1825                         }
1826                 }
1827         }
1828 }
1829 
1830 static void redo_format(void)
     /*  */
1831 {
1832         raw_cmd.track = format_req.track << floppy->stretch;
1833         buffer_track = -1;
1834         setup_format_params();
1835         floppy_start();
1836 #ifdef DEBUGT
1837         debugt("queue format request");
1838 #endif
1839 }
1840 
1841 static struct cont_t format_cont={
1842         format_interrupt,
1843         redo_format,
1844         bad_flp_intr,
1845         generic_done };
1846 
1847 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1848 {
1849         int ret;
1850         int drive=DRIVE(device);
1851 
1852         LOCK_FDC(drive,1);
1853         set_floppy(device);
1854         if (!floppy ||
1855             floppy->track > DP->tracks ||
1856             tmp_format_req->track >= floppy->track ||
1857             tmp_format_req->head >= floppy->head ||
1858             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
1859             !floppy->fmt_gap) {
1860                 process_fd_request();
1861                 return -EINVAL;
1862         }
1863         format_req = *tmp_format_req;
1864         format_errors = 0;
1865         cont = &format_cont;
1866         errors = &format_errors;
1867         IWAIT(redo_format);
1868         process_fd_request();
1869         return ret;
1870 }
1871 
1872 /*
1873  * Buffer read/write and support
1874  * =============================
1875  */
1876 
1877 /* new request_done. Can handle physical sectors which are smaller than a
1878  * logical buffer */
1879 static void request_done(int uptodate)
     /*  */
1880 {
1881         int block;
1882 
1883         probing = 0;
1884         del_timer(&fd_timeout);
1885 
1886         if (!CURRENT){
1887                 DPRINT("request list destroyed in floppy request done\n");
1888                 return;
1889         }
1890         if (uptodate){
1891                 /* maintain values for invalidation on geometry
1892                    change */
1893                 block = current_count_sectors + CURRENT->sector;
1894                 if (block > DRS->maxblock)
1895                         DRS->maxblock=block;
1896                 if ( block > floppy->sect)
1897                         DRS->maxtrack = 1;
1898 
1899                 /* unlock chained buffers */
1900                 while (current_count_sectors && CURRENT &&
1901                        current_count_sectors >= CURRENT->current_nr_sectors ){
1902                         current_count_sectors -= CURRENT->current_nr_sectors;
1903                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1904                         CURRENT->sector += CURRENT->current_nr_sectors;
1905                         end_request(1);
1906                 }
1907                 if ( current_count_sectors && CURRENT){
1908                         /* "unlock" last subsector */
1909                         CURRENT->buffer += current_count_sectors <<9;
1910                         CURRENT->current_nr_sectors -= current_count_sectors;
1911                         CURRENT->nr_sectors -= current_count_sectors;
1912                         CURRENT->sector += current_count_sectors;
1913                         return;
1914                 }
1915 
1916                 if ( current_count_sectors && ! CURRENT )
1917                         DPRINT("request list destroyed in floppy request done\n");
1918 
1919         } else {
1920                 if(CURRENT->cmd == WRITE) {
1921                         /* record write error information */
1922                         DRWE->write_errors++;
1923                         if(DRWE->write_errors == 1) {
1924                                 DRWE->first_error_sector = CURRENT->sector;
1925                                 DRWE->first_error_generation = DRS->generation;
1926                         }
1927                         DRWE->last_error_sector = CURRENT->sector;
1928                         DRWE->last_error_generation = DRS->generation;
1929                 }
1930                 end_request(0);
1931         }
1932 }
1933 
1934 /* Interrupt handler evaluating the result of the r/w operation */
1935 static void rw_interrupt(void)
     /*  */
1936 {
1937         int nr_sectors, ssize;
1938 
1939         if ( ! DRS->first_read_date )
1940                 DRS->first_read_date = jiffies;
1941 
1942         nr_sectors = 0;
1943         CODE2SIZE;
1944         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1945                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
1946                         (sector_t % floppy->sect) % ssize;
1947 
1948 #ifdef CONFIG_FLOPPY_SANITY
1949         if ( nr_sectors > current_count_sectors + ssize -
1950             (current_count_sectors + sector_t) % ssize +
1951             sector_t % ssize){
1952                 DPRINT2("long rw: %x instead of %lx\n",
1953                         nr_sectors, current_count_sectors);
1954                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
1955                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
1956                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
1957                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
1958                        sector_t, ssize);
1959         }
1960 #endif
1961         if ( nr_sectors < 0 )
1962                 nr_sectors = 0;
1963         if ( nr_sectors < current_count_sectors )
1964                 current_count_sectors = nr_sectors;
1965 
1966         switch (interpret_errors()){
1967         case 2:
1968                 cont->redo();
1969                 return;
1970         case 1:
1971                 if (  !current_count_sectors){
1972                         cont->error();
1973                         cont->redo();
1974                         return;
1975                 }
1976                 break;
1977         case 0:
1978                 if (  !current_count_sectors){
1979                         cont->redo();
1980                         return;
1981                 }
1982                 current_type[current_drive] = floppy;
1983                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1984                         floppy->size >> 1;
1985                 break;
1986         }
1987 
1988         if (probing) {
1989                 if (DP->flags & FTD_MSG)
1990                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
1991                                 floppy->name,current_drive);
1992                 current_type[current_drive] = floppy;
1993                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1994                         floppy->size >> 1;
1995                 probing = 0;
1996         }
1997 
1998         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
1999                 /* transfer directly from buffer */
2000                 cont->done(1);
2001         } else if ( CT(COMMAND) == FD_READ){
2002                 buffer_track = raw_cmd.track;
2003                 buffer_drive = current_drive;
2004                 if ( nr_sectors + sector_t > buffer_max )
2005                         buffer_max = nr_sectors + sector_t;
2006         }
2007         cont->redo();
2008 }
2009 
2010 /* Compute maximal contiguous buffer size. */
2011 static int buffer_chain_size(void)
     /*  */
2012 {
2013         struct buffer_head *bh;
2014         int size;
2015         char *base;
2016 
2017         base = CURRENT->buffer;
2018         size = CURRENT->current_nr_sectors << 9;
2019         bh = CURRENT->bh;
2020 
2021         if (bh){
2022                 bh = bh->b_reqnext;
2023                 while ( bh && bh->b_data == base + size ){
2024                         size += bh->b_size;
2025                         bh = bh->b_reqnext;
2026                 }
2027         }
2028         return size >> 9;
2029 }
2030 
2031 /* Compute the maximal transfer size */
2032 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2033 {
2034         if ( max_sector > sector_t + max_size)
2035                 max_sector = sector_t + max_size;
2036 
2037         /* alignment */
2038         max_sector -= (max_sector % floppy->sect ) % ssize;
2039 
2040         /* transfer size, beginning not aligned */
2041         current_count_sectors = max_sector - sector_t ;
2042 
2043         return max_sector;
2044 }
2045 
2046 /*
2047  * Move data from/to the track buffer to/from the buffer cache.
2048  */
2049 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2050 {
2051         int remaining; /* number of transferred 512-byte sectors */
2052         struct buffer_head *bh;
2053         char *buffer, *dma_buffer;
2054         int size;
2055 
2056         if ( max_sector > max_sector_2 )
2057                 max_sector = max_sector_2;
2058 
2059         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2060 
2061         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2062             buffer_max > sector_t + CURRENT->nr_sectors){
2063                 current_count_sectors = buffer_max - sector_t;
2064                 if ( current_count_sectors > CURRENT->nr_sectors )
2065                         current_count_sectors = CURRENT->nr_sectors;
2066         }
2067         remaining = current_count_sectors << 9;
2068 #ifdef CONFIG_FLOPPY_SANITY
2069         if ((remaining >> 9) > CURRENT->nr_sectors  && 
2070             CT(COMMAND) == FD_WRITE ){
2071                 DPRINT("in copy buffer\n");
2072                 printk("current_count_sectors=%ld\n", current_count_sectors);
2073                 printk("remaining=%d\n", remaining >> 9);
2074                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2075                 printk("CURRENT->current_nr_sectors=%ld\n",
2076                        CURRENT->current_nr_sectors);
2077                 printk("max_sector=%d\n", max_sector);
2078                 printk("ssize=%d\n", ssize);
2079         }
2080 #endif
2081 
2082         if ( max_sector > buffer_max )
2083                 buffer_max = max_sector;
2084 
2085         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2086 
2087         bh = CURRENT->bh;
2088         size = CURRENT->current_nr_sectors << 9;
2089         buffer = CURRENT->buffer;
2090 
2091         while ( remaining > 0){
2092                 if ( size > remaining )
2093                         size = remaining;
2094 #ifdef CONFIG_FLOPPY_SANITY
2095                 if (dma_buffer + size >
2096                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2097                     dma_buffer < floppy_track_buffer ){
2098                         DPRINT1("buffer overrun in copy buffer %d\n",
2099                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2100                         printk("sector_t=%d buffer_min=%d\n",
2101                                sector_t, buffer_min);
2102                         printk("current_count_sectors=%ld\n",
2103                                current_count_sectors);
2104                         if ( CT(COMMAND) == FD_READ )
2105                                 printk("read\n");
2106                         if ( CT(COMMAND) == FD_READ )
2107                                 printk("write\n");
2108                         break;
2109                 }
2110                 if ( ((unsigned long)buffer) % 512 )
2111                         DPRINT1("%p buffer not aligned\n", buffer);
2112 #endif
2113                 if ( CT(COMMAND) == FD_READ )
2114                         memcpy( buffer, dma_buffer, size);
2115                 else
2116                         memcpy( dma_buffer, buffer, size);
2117                 remaining -= size;
2118                 if ( !remaining)
2119                         break;
2120 
2121                 dma_buffer += size;
2122                 bh = bh->b_reqnext;
2123 #ifdef CONFIG_FLOPPY_SANITY
2124                 if ( !bh){
2125                         DPRINT("bh=null in copy buffer after copy\n");
2126                         break;
2127                 }
2128 #endif
2129                 size = bh->b_size;
2130                 buffer = bh->b_data;
2131         }
2132 #ifdef CONFIG_FLOPPY_SANITY
2133         if ( remaining ){
2134                 if ( remaining > 0 )
2135                         max_sector -= remaining >> 9;
2136                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2137         }
2138 #endif
2139 }
2140 
2141 /*
2142  * Formulate a read/write request.
2143  * this routine decides where to load the data (directly to buffer, or to
2144  * tmp floppy area), how much data to load (the size of the buffer, the whole
2145  * track, or a single sector)
2146  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2147  * allocation on the fly, it should be done here. No other part should need
2148  * modification.
2149  */
2150 
2151 static int make_raw_rw_request(void)
     /*  */
2152 {
2153         int aligned_sector_t;
2154         int max_sector, max_size, tracksize, ssize;
2155 
2156         set_fdc(DRIVE(CURRENT->dev));
2157 
2158         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2159                 FD_RAW_NEED_SEEK;
2160         raw_cmd.cmd_count = NR_RW;
2161         if (CURRENT->cmd == READ){
2162                 raw_cmd.flags |= FD_RAW_READ;
2163                 COMMAND = FM_MODE(floppy,FD_READ);
2164         } else if (CURRENT->cmd == WRITE){
2165                 raw_cmd.flags |= FD_RAW_WRITE;
2166                 COMMAND = FM_MODE(floppy,FD_WRITE);
2167         } else {
2168                 DPRINT("make_raw_rw_request: unknown command\n");
2169                 return 0;
2170         }
2171 
2172         max_sector = floppy->sect * floppy->head;
2173         TRACK = CURRENT->sector / max_sector;
2174         sector_t = CURRENT->sector % max_sector;
2175         if ( floppy->track && TRACK >= floppy->track )
2176                 return 0;
2177         HEAD = sector_t / floppy->sect;
2178 
2179         if ( TESTF( FD_NEED_TWADDLE) && sector_t < floppy->sect )
2180                 max_sector = floppy->sect;
2181 
2182         /* 2M disks have phantom sectors on the first track */
2183         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2184                 max_sector = 2 * floppy->sect / 3;
2185                 if (sector_t >= max_sector){
2186                         current_count_sectors =  (floppy->sect - sector_t);
2187                         if ( current_count_sectors > CURRENT->nr_sectors )
2188                                 current_count_sectors = CURRENT->nr_sectors;
2189                         return 1;
2190                 }
2191                 SIZECODE = 2;
2192         } else
2193                 SIZECODE = FD_SIZECODE(floppy);
2194         raw_cmd.rate = floppy->rate & 3;
2195         if ((floppy->rate & FD_2M) &&
2196             (TRACK || HEAD ) &&
2197             raw_cmd.rate == 2)
2198                 raw_cmd.rate = 1;
2199 
2200         if ( SIZECODE )
2201                 SIZECODE2 = 0xff;
2202         else
2203                 SIZECODE2 = 0x80;
2204         raw_cmd.track = TRACK << floppy->stretch;
2205         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
2206         GAP = floppy->gap;
2207         CODE2SIZE;
2208         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2209         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2210         tracksize = floppy->sect - floppy->sect % ssize;
2211         if ( tracksize < floppy->sect ){
2212                 SECT_PER_TRACK ++;
2213                 if (  tracksize <= sector_t % floppy->sect)
2214                         SECTOR--;
2215                 while ( tracksize <= sector_t % floppy->sect){
2216                         while( tracksize + ssize > floppy->sect ){
2217                                 SIZECODE--;
2218                                 ssize >>= 1;
2219                         }
2220                         SECTOR++; SECT_PER_TRACK ++;
2221                         tracksize += ssize;
2222                 }
2223                 max_sector = HEAD * floppy->sect + tracksize;
2224         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2225                 max_sector = floppy->sect;
2226 
2227         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2228         max_size = CURRENT->nr_sectors;
2229         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2230             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2231                 /* data already in track buffer */
2232                 if (CT(COMMAND) == FD_READ) {
2233                         copy_buffer(1, max_sector, buffer_max);
2234                         return 1;
2235                 }
2236         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2237                 if (CT(COMMAND) == FD_WRITE){
2238                         if(sector_t + CURRENT->nr_sectors > ssize &&
2239                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2240                                 max_size = ssize + ssize;
2241                         else
2242                                 max_size = ssize;
2243                 }
2244                 raw_cmd.flags &= ~FD_RAW_WRITE;
2245                 raw_cmd.flags |= FD_RAW_READ;
2246                 COMMAND = FM_MODE(floppy,FD_READ);
2247         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2248                 int direct, indirect;
2249 
2250                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2251                         sector_t;
2252 
2253                 max_size = buffer_chain_size();
2254                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2255                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2256                 /* 64 kb boundaries */
2257                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2258                      ((long) CURRENT->buffer ) / K_64 )
2259                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2260                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2261                 /*
2262                  * We try to read tracks, but if we get too many errors, we
2263                  * go back to reading just one sector at a time.
2264                  *
2265                  * This means we should be able to read a sector even if there
2266                  * are other bad sectors on this track.
2267                  */
2268                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2269                     *errors < DP->max_errors.read_track &&
2270                     /*!TESTF( FD_NEED_TWADDLE) &&*/
2271                     ( ( !probing || (DP->read_track &
2272                            (1 <<DRS->probed_format))))){
2273                         max_size = CURRENT->nr_sectors;
2274                 } else {
2275                         current_addr = CURRENT->buffer;
2276                         raw_cmd.length = current_count_sectors << 9;
2277                         return 2;
2278                 }
2279         }
2280 
2281         if ( CT(COMMAND) == FD_READ )
2282                 max_size = max_sector; /* unbounded */
2283 
2284         /* claim buffer track if needed */
2285         if (buffer_track != raw_cmd.track ||  /* bad track */
2286             buffer_drive !=current_drive || /* bad drive */
2287             sector_t < buffer_min ||
2288             ((CT(COMMAND) == FD_READ ||
2289               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2290              max_sector > 2 * max_buffer_sectors + buffer_min &&
2291              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2292             /* not enough space */ ){
2293                 buffer_track = -1;
2294                 buffer_drive = current_drive;
2295                 buffer_max = buffer_min = aligned_sector_t;
2296         }
2297         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2298 
2299         if ( CT(COMMAND) == FD_WRITE ){
2300                 /* copy write buffer to track buffer.
2301                  * if we get here, we know that the write
2302                  * is either aligned or the data already in the buffer
2303                  * (buffer will be overwritten) */
2304 #ifdef CONFIG_FLOPPY_SANITY
2305                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2306                         DPRINT("internal error offset !=0 on write\n");
2307 #endif
2308                 buffer_track = raw_cmd.track;
2309                 buffer_drive = current_drive;
2310                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2311         } else
2312                 transfer_size(ssize, max_sector,
2313                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2314 
2315         /* round up current_count_sectors to get dma xfer size */
2316         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2317         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2318         raw_cmd.length <<= 9;
2319 #ifdef CONFIG_FLOPPY_SANITY
2320         if ((raw_cmd.length < current_count_sectors << 9) ||
2321             (current_addr != CURRENT->buffer &&
2322              CT(COMMAND) == FD_WRITE &&
2323              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2324               aligned_sector_t < buffer_min )) ||
2325             raw_cmd.length % ( 128 << SIZECODE ) ||
2326             raw_cmd.length <= 0 || current_count_sectors <= 0){
2327                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2328                         raw_cmd.length, current_count_sectors);
2329                 if ( current_addr != CURRENT->buffer )
2330                         printk("addr=%d, length=%ld\n",
2331                                (int) ((current_addr - floppy_track_buffer ) >> 9),
2332                                current_count_sectors);
2333                 printk("st=%d ast=%d mse=%d msi=%d\n",
2334                        sector_t, aligned_sector_t, max_sector, max_size);
2335                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2336                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2337                        COMMAND, SECTOR, HEAD, TRACK);
2338                 printk("buffer drive=%d\n", buffer_drive);
2339                 printk("buffer track=%d\n", buffer_track);
2340                 printk("buffer_min=%d\n", buffer_min );
2341                 printk("buffer_max=%d\n", buffer_max );
2342                 return 0;
2343         }
2344 
2345         if (current_addr != CURRENT->buffer ){
2346                 if (current_addr < floppy_track_buffer ||
2347                     current_count_sectors < 0 ||
2348                     raw_cmd.length < 0 ||
2349                     current_addr + raw_cmd.length >
2350                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2351                         DPRINT("buffer overrun in schedule dma\n");
2352                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2353                                sector_t, buffer_min,
2354                                raw_cmd.length >> 9 );
2355                         printk("current_count_sectors=%ld\n",
2356                                current_count_sectors);
2357                         if ( CT(COMMAND) == FD_READ )
2358                                 printk("read\n");
2359                         if ( CT(COMMAND) == FD_READ )
2360                                 printk("write\n");
2361                         return 0;
2362                 }
2363         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2364                    current_count_sectors > CURRENT->nr_sectors){
2365                 DPRINT("buffer overrun in direct transfer\n");
2366                 return 0;
2367         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2368                 DPRINT("more sectors than bytes\n");
2369                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2370                 printk("sectors=%ld\n", current_count_sectors);
2371         }
2372 #endif
2373         return 2;
2374 }
2375 
2376 static void redo_fd_request(void)
     /*  */
2377 {
2378 #define REPEAT {request_done(0); continue; }
2379         int device;
2380         int tmp;
2381         int error;
2382 
2383         error = -1;
2384         if (current_drive < N_DRIVE)
2385                 floppy_off(current_drive);
2386 
2387         if (CURRENT && CURRENT->dev < 0) return;
2388 
2389         while(1){
2390                 if (!CURRENT) {
2391                         CLEAR_INTR;
2392                         unlock_fdc();
2393                         return;
2394                 }
2395                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2396                         panic(DEVICE_NAME ": request list destroyed");
2397                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2398                         panic(DEVICE_NAME ": block not locked");
2399 #if 0
2400                 if (!CURRENT->bh->b_count && 
2401                     (CURRENT->errors || error == CURRENT->dev)){
2402                         error=CURRENT->dev;
2403                         DPRINT("skipping read ahead buffer\n");
2404                         REPEAT;
2405                 }
2406 #endif
2407                 error=-1;
2408                 device = CURRENT->dev;
2409                 set_fdc( DRIVE(device));
2410 
2411                 del_timer(&fd_timeout);
2412                 fd_timeout.expires = DP->timeout;
2413                 add_timer(&fd_timeout);
2414 
2415                 set_floppy(device);
2416                 if(start_motor(redo_fd_request)) return;
2417                 if(test_bit(current_drive, &fake_change) ||
2418                    TESTF(FD_DISK_CHANGED)){
2419                         DPRINT("disk absent or changed during operation\n");
2420                         REPEAT;
2421                 }
2422                 if (!floppy) { /* Autodetection */
2423                         if (!probing){
2424                                 DRS->probed_format = 0;
2425                                 if ( next_valid_format() ){
2426                                         DPRINT("no autodetectable formats\n");
2427                                         floppy = NULL;
2428                                         REPEAT;
2429                                 }
2430                         }
2431                         probing = 1;
2432                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2433                 } else
2434                         probing = 0;
2435                 errors = & (CURRENT->errors);
2436                 tmp = make_raw_rw_request();
2437                 if ( tmp < 2 ){
2438                         request_done(tmp);
2439                         continue;
2440                 }
2441 
2442                 if (TESTF(FD_NEED_TWADDLE))
2443                         twaddle();
2444                 floppy_tq.routine = (void *)(void *) floppy_start;
2445                 queue_task(&floppy_tq, &tq_timer);
2446 #ifdef DEBUGT
2447                 debugt("queue fd request");
2448 #endif
2449                 return;
2450         }
2451 #undef REPEAT
2452 }
2453 
2454 static struct cont_t rw_cont={
2455         rw_interrupt,
2456         redo_fd_request,
2457         bad_flp_intr,
2458         request_done };
2459 
2460 struct tq_struct request_tq = 
2461 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2462 
2463 static void process_fd_request(void)
     /*  */
2464 {
2465         cont = &rw_cont;
2466         queue_task(&request_tq, &tq_timer);
2467 }
2468 
2469 static void do_fd_request(void)
     /*  */
2470 {
2471         if (fdc_busy)
2472                 /* fdc busy, this new request will be treated when the
2473                    current one is done */
2474                 return;
2475         /* fdc_busy cannot be set by an interrupt or a bh */
2476         floppy_grab_irq_and_dma();
2477         fdc_busy=1;
2478         process_fd_request();
2479 }
2480 
2481 static struct cont_t poll_cont={
2482         success_and_wakeup,
2483         floppy_ready,
2484         generic_failure,
2485         generic_done };
2486 
2487 static int poll_drive(int interruptible, int flag){
     /*  */
2488         int ret;
2489         /* no auto-sense, just clear dcl */
2490         raw_cmd.flags= flag;
2491         raw_cmd.track=0;
2492         raw_cmd.cmd_count=0;
2493         cont = &poll_cont;
2494 #ifdef DCL_DEBUG
2495                 if (DP->flags & FD_DEBUG){
2496                         DPRINT("setting NEWCHANGE in poll_drive\n");
2497                 }
2498 #endif
2499         SETF(FD_DISK_NEWCHANGE);
2500         WAIT(floppy_ready);
2501         return ret;
2502 }
2503 
2504 /*
2505  * User triggered reset
2506  * ====================
2507  */
2508 
2509 static void reset_intr(void)
     /*  */
2510 {
2511         printk("weird, reset interrupt called\n");
2512 }
2513 
2514 static struct cont_t reset_cont={
2515         reset_intr,
2516         success_and_wakeup,
2517         generic_failure,
2518         generic_done };
2519 
2520 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2521 {
2522         int ret;
2523 
2524         ret=0;
2525         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2526                 return 0;
2527         LOCK_FDC(drive,interruptible);
2528         if(arg == FD_RESET_ALWAYS)
2529                 FDCS->reset=1;
2530         if ( FDCS->reset ){
2531                 cont = &reset_cont;
2532                 del_timer(&fd_timeout);
2533                 fd_timeout.expires = DP->timeout;
2534                 add_timer(&fd_timeout);
2535                 WAIT(reset_fdc);
2536         }
2537         process_fd_request();
2538         return ret;
2539 }
2540 
2541 /*
2542  * Misc Ioctl's and support
2543  * ========================
2544  */
2545 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2546 {
2547         int i;
2548 
2549         i = verify_area(VERIFY_WRITE,param,size);
2550         if (i)
2551                 return i;
2552         memcpy_tofs(param,(void *) address, size);
2553         return 0;
2554 }
2555 
2556 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2557 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2558 
2559 static char *drive_name(int type, int drive )
     /*  */
2560 {
2561         struct floppy_struct *floppy;   
2562 
2563         if ( type )
2564                 floppy = floppy_type + type;
2565         else {
2566                 if ( UDP->native_format )
2567                         floppy = floppy_type + UDP->native_format;
2568                 else
2569                         return "(null)";
2570         }
2571         if ( floppy->name )
2572                 return floppy->name;
2573         else
2574                 return "(null)";
2575 }
2576 
2577 /* raw commands */
2578 static struct cont_t raw_cmd_cont={
2579         success_and_wakeup,
2580         failure_and_wakeup,
2581         generic_failure,
2582         generic_done };
2583 
2584 static int raw_cmd_ioctl(void *param)
     /*  */
2585 {
2586         int i, drive, count, ret;
2587 
2588         if ( FDCS->rawcmd <= 1 )
2589                 FDCS->rawcmd = 1;
2590         for ( drive= 0; drive < N_DRIVE; drive++){
2591                 if ( FDC(drive) != fdc)
2592                         continue;
2593                 if ( drive == current_drive ){
2594                         if ( UDRS->fd_ref > 1 ){
2595                                 FDCS->rawcmd = 2;
2596                                 break;
2597                         }
2598                 } else if ( UDRS->fd_ref ){
2599                         FDCS->rawcmd = 2;
2600                         break;
2601                 }
2602         }
2603 
2604         if(FDCS->reset)
2605                 return -EIO;
2606 
2607         COPYIN(raw_cmd);
2608         raw_cmd.rate &= 0x03;   
2609         count = raw_cmd.length;
2610         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2611                 if(count > max_buffer_sectors * 1024 )
2612                         return -ENOMEM;
2613                 buffer_track = -1;
2614         }
2615         if ( raw_cmd.flags & FD_RAW_WRITE ){
2616                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2617                 if (i)
2618                         return i;
2619                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2620         }
2621 
2622         current_addr = floppy_track_buffer;
2623         cont = &raw_cmd_cont;
2624         IWAIT(floppy_start);
2625 #ifdef DCL_DEBUG
2626         if (DP->flags & FD_DEBUG){
2627                 DPRINT("calling disk change from raw_cmd ioctl\n");
2628         }
2629 #endif
2630         if( disk_change(current_drive) )
2631                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2632         else
2633                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2634         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2635                 motor_off_callback(current_drive);      
2636 
2637         if ( !ret && !FDCS->reset ){
2638                 raw_cmd.reply_count = inr;
2639                 for( i=0; i< raw_cmd.reply_count; i++)
2640                         raw_cmd.reply[i] = reply_buffer[i];
2641                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2642                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2643         } else
2644                 ret = -EIO;
2645         DRS->track = NO_TRACK;
2646         if ( ret )
2647                 return ret;
2648 
2649         if ( raw_cmd.flags & FD_RAW_READ ){
2650                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2651                 if (i)
2652                         return i;
2653         }
2654        
2655         return COPYOUT(raw_cmd);
2656 }
2657 
2658 static int invalidate_drive(int rdev)
     /*  */
2659 {
2660         /* invalidate the buffer track to force a reread */
2661         set_bit( DRIVE(rdev), &fake_change);
2662         process_fd_request();
2663         check_disk_change(rdev);
2664         return 0;
2665 }
2666 
2667 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2668     unsigned long param)
2669 {
2670 #define IOCTL_MODE_BIT 8
2671 #define OPEN_WRITE_BIT 16
2672 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2673 
2674         struct floppy_struct newparams;
2675         struct format_descr tmp_format_req;
2676         int i,device,drive,type,cnt;
2677         struct floppy_struct *this_floppy;
2678         char *name;
2679 
2680         device = inode->i_rdev;
2681         switch (cmd) {
2682                 RO_IOCTLS(device,param);
2683         }
2684         type = TYPE(device);
2685         drive = DRIVE(device);
2686         switch (cmd) {
2687         case FDGETDRVTYP:
2688                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2689                 if (i)
2690                         return i;
2691                 name = drive_name(type,drive);
2692                 for ( cnt=0; cnt<16; cnt++){
2693                         put_fs_byte(name[cnt],
2694                                     ((char*)param)+cnt);
2695                         if ( ! *name )
2696                                 break;
2697                 }
2698                 return 0;
2699         case FDGETMAXERRS:
2700                 return COPYOUT(UDP->max_errors);
2701         case FDGETPRM:
2702                 if (type)
2703                         this_floppy = &floppy_type[type];
2704                 else if ((this_floppy = current_type[drive]) ==
2705                          NULL)
2706                         return -ENODEV;
2707                 return COPYOUT(this_floppy[0]);
2708         case FDPOLLDRVSTAT:
2709                 LOCK_FDC(drive,1);
2710                 CALL(poll_drive(1, FD_RAW_NEED_DISK));
2711                 process_fd_request();
2712                 /* fall through */
2713         case FDGETDRVSTAT:
2714                 return COPYOUT(*UDRS);
2715         case FDGETFDCSTAT:
2716                 return COPYOUT(*UFDCS);
2717         case FDGETDRVPRM:
2718                 return COPYOUT(*UDP);
2719         case FDWERRORGET:
2720                 return COPYOUT(*UDRWE);
2721         }
2722         if (!IOCTL_ALLOWED)
2723                 return -EPERM;
2724         switch (cmd) {
2725         case FDWERRORCLR:
2726                 UDRWE->write_errors = 0;
2727                 UDRWE->first_error_sector = 0;
2728                 UDRWE->first_error_generation = 0;
2729                 UDRWE->last_error_sector = 0;
2730                 UDRWE->last_error_generation = 0;
2731                 UDRWE->badness = 0;
2732                 return 0;
2733         case FDRAWCMD:
2734                 if (type)
2735                         return -EINVAL;
2736                 LOCK_FDC(drive,1);
2737                 set_floppy(device);
2738                 CALL(i = raw_cmd_ioctl((void *) param));
2739                 process_fd_request();
2740                 return i;
2741         case FDFMTTRK:
2742                 if (UDRS->fd_ref != 1)
2743                         return -EBUSY;
2744                 COPYIN(tmp_format_req);
2745                 return do_format(device, &tmp_format_req);
2746         case FDSETMAXERRS:
2747                 return COPYIN(UDP->max_errors);
2748         case FDFMTBEG:
2749                 return 0;
2750         case FDCLRPRM:
2751                 LOCK_FDC(drive,1);
2752                 current_type[drive] = NULL;
2753                 floppy_sizes[drive] = MAX_DISK_SIZE;
2754                 UDRS->keep_data = 0;
2755                 return invalidate_drive(device);
2756         case FDFMTEND:
2757         case FDFLUSH:
2758                 LOCK_FDC(drive,1);
2759                 return invalidate_drive(device);
2760         case FDSETPRM:
2761         case FDDEFPRM:
2762                 COPYIN(newparams);
2763                 /* sanity checking for parameters.*/
2764                 if(newparams.sect <= 0 ||
2765                    newparams.head <= 0 ||
2766                    newparams.track <= 0 ||
2767                    newparams.track >
2768                    UDP->tracks>>newparams.stretch)
2769                         return -EINVAL;
2770                 if ( type){
2771                         if ( !suser() )
2772                                 return -EPERM;
2773                         LOCK_FDC(drive,1);
2774                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2775                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2776                                     drive_state[cnt].fd_ref)
2777                                         set_bit(drive, &fake_change);
2778                         }
2779                         floppy_type[type] = newparams;
2780                         floppy_type[type].name="user format";
2781                         for (cnt = type << 2 ;
2782                              cnt < (type << 2 ) + 4 ;
2783                              cnt++)
2784                                 floppy_sizes[cnt]=
2785 #ifdef CONFIG_FLOPPY_2_FDC
2786                                         floppy_sizes[cnt+0x80]=
2787 #endif
2788                                                 floppy_type[type].size>>1;
2789                         process_fd_request();
2790                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2791                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2792                                     drive_state[cnt].fd_ref)
2793                                         check_disk_change(drive_state[cnt].
2794                                                           fd_device);
2795                         }
2796                         return 0;
2797                 }
2798 
2799                 LOCK_FDC(drive,1);
2800                 if ( cmd != FDDEFPRM )
2801                         /* notice a disk change immediately, else
2802                          * we loose our settings immediately*/
2803                         CALL(poll_drive(1,0));
2804                 user_params[drive] = newparams;
2805                 if (buffer_drive == drive &&
2806                     buffer_max > user_params[drive].sect)
2807                         buffer_max=user_params[drive].sect;
2808                 current_type[drive] = &user_params[drive];
2809                 floppy_sizes[drive] = user_params[drive].size >> 1;
2810                 if (cmd == FDDEFPRM)
2811                         DRS->keep_data = -1;
2812                 else
2813                         DRS->keep_data = 1;
2814                 /* invalidation. Invalidate only when needed, i.e.
2815                  * when there are already sectors in the buffer cache
2816                  * whose number will change. This is useful, because
2817                  * mtools often changes the geometry of the disk after
2818                  * looking at the boot block */
2819                 if (DRS->maxblock >
2820                     user_params[drive].sect ||
2821                     DRS->maxtrack )
2822                         invalidate_drive(device);
2823                 else
2824                         process_fd_request();
2825                 return 0;
2826         case FDRESET:
2827                 return user_reset_fdc( drive, (int)param, 1);
2828         case FDMSGON:
2829                 UDP->flags |= FTD_MSG;
2830                 return 0;
2831         case FDMSGOFF:
2832                 UDP->flags &= ~FTD_MSG;
2833                 return 0;
2834         case FDSETEMSGTRESH:
2835                 UDP->max_errors.reporting =
2836                         (unsigned short) (param & 0x0f);
2837                 return 0;
2838         case FDTWADDLE:
2839                 LOCK_FDC(drive,1);
2840                 twaddle();
2841                 process_fd_request();
2842         }
2843         if ( ! suser() )
2844                 return -EPERM;
2845         switch(cmd){
2846         case FDSETDRVPRM:
2847                 return COPYIN(*UDP);
2848         default:
2849                 return -EINVAL;
2850         }
2851         return 0;
2852 #undef IOCTL_ALLOWED
2853 }
2854 
2855 #define CMOS_READ(addr) ({ \
2856 outb_p(addr,0x70); \
2857 inb_p(0x71); \
2858 })
2859 
2860 static void set_base_type(int drive,int code)
     /*  */
2861 {
2862         if (code > 0 && code <= NUMBER(default_drive_params)) {
2863                 memcpy((char *) UDP,
2864                        (char *) (&default_drive_params[code].params),
2865                        sizeof( struct floppy_drive_params ));
2866                 printk("fd%d is %s", drive, default_drive_params[code].name);
2867                 return;
2868         } else if (!code)
2869                 printk("fd%d is not installed", drive);
2870         else
2871                 printk("fd%d is unknown type %d",drive,code);
2872 }
2873 
2874 static void config_types(void)
     /*  */
2875 {
2876         int drive;
2877 
2878         for (drive=0; drive<N_DRIVE ; drive++){
2879                 /* default type for unidentifiable drives */
2880                 memcpy((char *) UDP, (char *) (&default_drive_params->params),
2881                        sizeof( struct floppy_drive_params ));
2882         }
2883         printk("Floppy drive(s): ");
2884         set_base_type(0, (CMOS_READ(0x10) >> 4) & 15);
2885         if (CMOS_READ(0x10) & 15) {
2886                 printk(", ");
2887                 set_base_type(1, CMOS_READ(0x10) & 15);
2888         }
2889         printk("\n");
2890 }
2891 
2892 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
2893                        char * buf, int count)
2894 {
2895         int drive = DRIVE(inode->i_rdev);
2896 
2897         check_disk_change(inode->i_rdev);
2898         if (UTESTF(FD_DISK_CHANGED))
2899                 return -ENXIO;
2900         return block_read(inode, filp, buf, count);
2901 }
2902 
2903 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
2904                         char * buf, int count)
2905 {
2906         int block;
2907         int ret;
2908         int drive = DRIVE(inode->i_rdev);
2909 
2910         if(!UDRS->maxblock)
2911                 UDRS->maxblock=1;/* make change detectable */
2912         check_disk_change(inode->i_rdev);
2913         if (UTESTF(FD_DISK_CHANGED)) 
2914                 return -ENXIO;
2915         if(!UTESTF(FD_DISK_WRITABLE))
2916                 return -EROFS;
2917         block = (filp->f_pos + count) >> 9;
2918         if(block > UDRS->maxblock)
2919                 UDRS->maxblock = block;
2920         ret= block_write(inode, filp, buf, count);
2921         return ret;
2922 }
2923 
2924 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
2925 {
2926         int drive;
2927         
2928         drive = DRIVE(inode->i_rdev);
2929 
2930         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
2931                 /* if the file is mounted OR (writable now AND writable at
2932                  * open time) Linus: Does this cover all cases? */
2933                 block_fsync(inode,filp);
2934                         
2935         if (UDRS->fd_ref < 0)
2936                 UDRS->fd_ref=0;
2937         else if (!UDRS->fd_ref--) {
2938                 DPRINT("floppy_release with fd_ref == 0");
2939                 UDRS->fd_ref = 0;
2940         }
2941         floppy_release_irq_and_dma();
2942 }
2943 
2944 /*
2945  * floppy_open check for aliasing (/dev/fd0 can be the same as
2946  * /dev/PS0 etc), and disallows simultaneous access to the same
2947  * drive with different device numbers.
2948  */
2949 #define RETERR(x) \
2950         do{floppy_release(inode,filp); \
2951            return -(x);}while(0)
2952 
2953 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2954 {
2955         int drive;
2956         int old_dev;
2957 
2958         if (!filp) {
2959                 DPRINT("Weird, open called with filp=0\n");
2960                 return -EIO;
2961         }
2962 
2963         drive = DRIVE(inode->i_rdev);
2964         if (drive >= N_DRIVE || 
2965             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
2966             fdc_state[FDC(drive)].version == FDC_NONE)
2967                 return -ENXIO;
2968 
2969         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
2970                 return -ENXIO;
2971         old_dev = UDRS->fd_device;
2972         if (UDRS->fd_ref && old_dev != inode->i_rdev)
2973                 return -EBUSY;
2974 
2975         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
2976                 USETF(FD_DISK_CHANGED);
2977                 USETF(FD_VERIFY);
2978         }
2979 
2980         if(UDRS->fd_ref == -1 ||
2981            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
2982                 return -EBUSY;
2983 
2984         if (floppy_grab_irq_and_dma())
2985                 return -EBUSY;
2986 
2987         if (filp->f_flags & O_EXCL)
2988                 UDRS->fd_ref = -1;
2989         else
2990                 UDRS->fd_ref++;
2991 
2992         UDRS->fd_device = inode->i_rdev;
2993 
2994         if (old_dev && old_dev != inode->i_rdev) {
2995                 if (buffer_drive == drive)
2996                         buffer_track = -1;
2997                 invalidate_buffers(old_dev);
2998         }
2999 
3000         /* Allow ioctls if we have write-permissions even if read-only open */
3001         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3002                 filp->f_mode |= IOCTL_MODE_BIT;
3003         if (filp->f_mode & 2)
3004                 filp->f_mode |= OPEN_WRITE_BIT;
3005 
3006         if (UFDCS->rawcmd == 1)
3007                UFDCS->rawcmd = 2;
3008 
3009         if (filp->f_flags & O_NDELAY)
3010                 return 0;
3011         if (filp->f_mode & 3) {
3012                 UDRS->last_checked = 0;
3013                 check_disk_change(inode->i_rdev);
3014                 if (UTESTF(FD_DISK_CHANGED))
3015                         RETERR(ENXIO);
3016         }
3017         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3018                 RETERR(EROFS);
3019         return 0;
3020 #undef RETERR
3021 }
3022 
3023 /*
3024  * Check if the disk has been changed or if a change has been faked.
3025  */
3026 static int check_floppy_change(dev_t dev)
     /*  */
3027 {
3028         int drive = DRIVE( dev );
3029 
3030         if (MAJOR(dev) != MAJOR_NR) {
3031                 DPRINT("floppy_changed: not a floppy\n");
3032                 return 0;
3033         }
3034 
3035         if (UTESTF(FD_DISK_CHANGED))
3036                 return 1;
3037 
3038         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3039                 lock_fdc(drive,0);
3040                 poll_drive(0,0);
3041                 process_fd_request();
3042         }
3043                 
3044         if(UTESTF(FD_DISK_CHANGED) ||
3045            test_bit(drive, &fake_change) ||
3046            (!TYPE(dev) && !current_type[drive]))
3047                 return 1;
3048         return 0;
3049 }
3050 
3051 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3052  * the bootblock (block 0). "Autodetection" is also needed to check whether
3053  * there is a disk in the drive at all... Thus we also do it for fixed
3054  * geometry formats */
3055 static int floppy_revalidate(dev_t dev)
     /*  */
3056 {
3057 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3058         struct buffer_head * bh;
3059         int drive=DRIVE(dev);
3060         int cf;
3061 
3062         if(UTESTF(FD_DISK_CHANGED) || test_bit(drive, &fake_change) || NO_GEOM){
3063                 lock_fdc(drive,0);
3064                 cf = UTESTF(FD_DISK_CHANGED);
3065                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3066                         process_fd_request(); /*already done by another thread*/
3067                         return 0;
3068                 }
3069                 UDRS->maxblock = 0;
3070                 UDRS->maxtrack = 0;
3071                 if ( buffer_drive == drive)
3072                         buffer_track = -1;
3073                 clear_bit(drive, &fake_change);
3074                 UCLEARF(FD_DISK_CHANGED);
3075                 if(cf)
3076                         UDRS->generation++;
3077                 if(NO_GEOM){
3078                         /* auto-sensing */
3079                         int size = floppy_blocksizes[MINOR(dev)];
3080                         if (!size)
3081                                 size = 1024;
3082                         if (!(bh = getblk(dev,0,size))){
3083                                 process_fd_request();
3084                                 return 1;
3085                         }
3086                         if ( bh && ! bh->b_uptodate)
3087                                 ll_rw_block(READ, 1, &bh);
3088                         process_fd_request();
3089                         wait_on_buffer(bh);
3090                         brelse(bh);
3091                         return 0;
3092                 } 
3093                 if(cf)
3094                                 poll_drive(0, FD_RAW_NEED_DISK);
3095                 process_fd_request();
3096         }
3097         return 0;
3098 }
3099 
3100 static struct file_operations floppy_fops = {
3101         NULL,                   /* lseek - default */
3102         floppy_read,            /* read - general block-dev read */
3103         floppy_write,           /* write - general block-dev write */
3104         NULL,                   /* readdir - bad */
3105         NULL,                   /* select */
3106         fd_ioctl,               /* ioctl */
3107         NULL,                   /* mmap */
3108         floppy_open,            /* open */
3109         floppy_release,         /* release */
3110         block_fsync,            /* fsync */
3111         NULL,                   /* fasync */
3112         check_floppy_change,    /* media_change */
3113         floppy_revalidate,      /* revalidate */
3114 };
3115 
3116 /*
3117  * Floppy Driver initialisation
3118  * =============================
3119  */
3120 
3121 /* Determine the floppy disk controller type */
3122 /* This routine was written by David C. Niemi */
3123 static char get_fdc_version(void)
     /*  */
3124 {
3125         int r;
3126 
3127         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3128         if ( FDCS->reset )
3129                 return FDC_NONE;
3130         if ( (r = result()) <= 0x00)
3131                 return FDC_NONE;        /* No FDC present ??? */
3132         if ((r==1) && (reply_buffer[0] == 0x80)){
3133                 printk("FDC %d is a 8272A\n",fdc);
3134                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3135         }
3136         if (r != 10) {
3137                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3138                 return FDC_UNKNOWN;
3139         }
3140         output_byte(FD_VERSION);
3141         r = result();
3142         if ((r == 1) && (reply_buffer[0] == 0x80)){
3143                 printk("FDC %d is a 82072\n",fdc);
3144                 return FDC_82072;               /* 82072 doesn't know VERSION */
3145         }
3146         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3147                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3148                 return FDC_UNKNOWN;
3149         }
3150         output_byte(FD_UNLOCK);
3151         r = result();
3152         if ((r == 1) && (reply_buffer[0] == 0x80)){
3153                 printk("FDC %d is a pre-1991 82077\n", fdc);
3154                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3155         }
3156         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3157                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3158                 return FDC_UNKNOWN;
3159         }
3160         printk("FDC %d is a post-1991 82077\n",fdc);
3161         return FDC_82077;       /* Revised 82077AA passes all the tests */
3162 } /* get_fdc_version */
3163 
3164 #ifndef FD_MODULE
3165 /* lilo configuration */
3166 static void invert_dcl(int *ints)
     /*  */
3167 {
3168         int i;
3169         
3170         for (i=0; i < ARRAY_SIZE(default_drive_params); i++)
3171                 default_drive_params[i].params.flags |= 0x80;
3172         DPRINT("Configuring drives for inverted dcl\n");
3173 }
3174 
3175 static void allow_drives(int *ints)
     /*  */
3176 {
3177         if (ints[1] >= 1 ){
3178                 ALLOWED_DRIVE_MASK=ints[1];
3179                 DPRINT1("setting allowed_drive_mask to 0x%x\n", ints[1]);
3180         } else
3181                 DPRINT("allowed_drive_mask needs a parameter\n");
3182 }
3183 
3184 #ifdef  CONFIG_FLOPPY_2_FDC
3185 static void twofdc(int *ints)
     /*  */
3186 {
3187         FDC2 = 0x370;
3188         DPRINT("enabling second fdc at address 0x370\n");
3189 }
3190 #endif
3191 
3192 static struct param_table {
3193         char *name;
3194         void (*fn)(int *ints);
3195 } config_params[]={
3196 { "allowed_drive_mask", allow_drives },
3197 #ifdef  CONFIG_FLOPPY_2_FDC
3198 { "two_fdc", twofdc },
3199 #endif
3200 { "thinkpad", invert_dcl } };
3201 
3202 void floppy_setup(char *str, int *ints)
     /*  */
3203 {
3204         int i;
3205         for(i=0; i< ARRAY_SIZE(config_params); i++){
3206                 if (strcmp(str,config_params[i].name) == 0 ){
3207                         config_params[i].fn(ints);
3208                         return;
3209                 }
3210         }
3211         printk("unknown floppy parameter %s\n", str);
3212 }
3213 #endif
3214 
3215 #ifdef FD_MODULE
3216 static
3217 #endif
3218 int new_floppy_init(void)
     /*  */
3219 {
3220         int i,drive;
3221         int have_no_fdc=0;
3222 
3223         sti();
3224 
3225         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3226                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3227                 return -EBUSY;
3228         }
3229 
3230         for(i=0; i<256; i++)
3231                 if ( TYPE(i))
3232                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3233                 else
3234                         floppy_sizes[i] = MAX_DISK_SIZE;
3235 
3236         blk_size[MAJOR_NR] = floppy_sizes;
3237         blksize_size[MAJOR_NR] = floppy_blocksizes;
3238         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3239         del_timer(&fd_timeout);
3240         config_types();
3241 
3242         fdc_state[0].address = FDC1;
3243         fdc_state[0].dor = 0;
3244 #if N_FDC > 1
3245         fdc_state[1].address = FDC2;
3246         fdc_state[1].dor = 0;
3247 #endif
3248 
3249         for (i = 0 ; i < N_FDC ; i++) {
3250                 fdc = i;
3251                 FDCS->dtr = -1;
3252                 FDCS->dor = 0x4;
3253                 FDCS->reset = 0;
3254                 FDCS->version = FDC_NONE;
3255         }
3256 
3257         if(floppy_grab_irq_and_dma()){
3258                 unregister_blkdev(MAJOR_NR,"fd");
3259                 return -EBUSY;
3260         }
3261 
3262         /* initialise drive state */
3263         for (drive = 0; drive < N_DRIVE ; drive++) {
3264                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3265                 UDRS->generation = 0;
3266                 UDRS->keep_data = 0;
3267                 UDRS->fd_ref = 0;
3268                 UDRS->fd_device = 0;
3269                 UDRWE->write_errors = 0;
3270                 UDRWE->first_error_sector = 0;
3271                 UDRWE->first_error_generation = 0;
3272                 UDRWE->last_error_sector = 0;
3273                 UDRWE->last_error_generation = 0;
3274                 UDRWE->badness = 0;
3275         }
3276 
3277         for (i = 0 ; i < N_FDC ; i++) {
3278                 fdc = i;
3279                 if (FDCS->address == -1 )
3280                         continue;
3281                 FDCS->rawcmd = 2;
3282                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3283                         FDCS->address = -1;
3284                         continue;
3285                 }
3286                 /* Try to determine the floppy controller type */
3287                 FDCS->version = get_fdc_version();
3288                 if (FDCS->version == FDC_NONE){
3289                         FDCS->address = -1;
3290                         continue;
3291                 }
3292 
3293                 have_no_fdc = 0;
3294                 /* Not all FDCs seem to be able to handle the version command
3295                  * properly, so force a reset for the standard FDC clones,
3296                  * to avoid interrupt garbage.
3297                  */
3298                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3299                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3300         }
3301         fdc=0;
3302         current_drive = 0;
3303         floppy_release_irq_and_dma();
3304         initialising=0;
3305         if(have_no_fdc)
3306                 unregister_blkdev(MAJOR_NR,"fd");
3307         return have_no_fdc;
3308 }
3309 
3310 /* stupid compatibility hack... */
3311 void floppy_init(void)
     /*  */
3312 {
3313         new_floppy_init();
3314 }
3315 
3316 static int floppy_grab_irq_and_dma(void)
     /*  */
3317 {
3318         int i;
3319         cli();
3320         if (usage_count++){
3321                 sti();
3322                 return 0;
3323         }
3324         sti();
3325 #ifdef FD_MODULE
3326         MOD_INC_USE_COUNT;
3327 #endif
3328         for(i=0; i< N_FDC; i++){
3329                 if(FDCS->address != -1){        
3330                         fdc = i;
3331                         reset_fdc_info(1);
3332                         outb_p(FDCS->dor, FD_DOR);
3333                 }
3334         }
3335         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3336 
3337         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
3338                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3339                         FLOPPY_IRQ);
3340                 return -1;
3341         }
3342         if (request_dma(FLOPPY_DMA,"floppy")) {
3343                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3344                         FLOPPY_DMA);
3345                 free_irq(FLOPPY_IRQ);
3346                 return -1;
3347         }
3348         for(fdc = 0; fdc < N_FDC ; fdc++)
3349                 if(FDCS->address != -1)
3350                         outb_p(FDCS->dor, FD_DOR);
3351         fdc = 0;
3352         enable_irq(FLOPPY_IRQ);
3353         return 0;
3354 }
3355 
3356 static void floppy_release_irq_and_dma(void)
     /*  */
3357 {
3358 #ifdef CONFIG_FLOPPY_SANITY
3359         int drive;
3360 #endif
3361         cli();
3362         if (--usage_count){
3363                 sti();
3364                 return;
3365         }
3366         sti();
3367 #ifdef FD_MODULE
3368         MOD_DEC_USE_COUNT;
3369 #endif
3370         disable_dma(FLOPPY_DMA);
3371         free_dma(FLOPPY_DMA);
3372         disable_irq(FLOPPY_IRQ);
3373         free_irq(FLOPPY_IRQ);
3374 
3375         set_dor(0, ~0, 8);
3376 #if N_FDC > 1
3377         set_dor(1, ~8, 0);
3378 #endif
3379 
3380 #ifdef CONFIG_FLOPPY_SANITY
3381         for(drive=0; drive < N_FDC * 4; drive++)
3382                 if( motor_off_timer[drive].next )
3383                         printk("motor off timer %d still active\n", drive);
3384         
3385         if(fd_timeout.next)
3386                 printk("floppy timer still active\n");
3387         if (fd_timer.next)
3388                 printk("auxiliary floppy timer still active\n");
3389         if(floppy_tq.sync)
3390                 printk("task queue still active\n");
3391 #endif
3392 }
3393 
3394 #endif