root/drivers/block/floppy.c

/* */

DEFINITIONS

1. set_debugt
2. debugt
3. disk_change
4. set_dor
5. twaddle
6. reset_fdc_info
7. set_fdc
8. lock_fdc
9. unlock_fdc
10. motor_off_callback
11. floppy_off
12. scandrives
13. fd_watchdog
14. main_command_interrupt
15. wait_for_completion
16. setup_DMA
17. output_byte
18. result
19. perpendicular_mode
20. fdc_specify
21. fdc_dtr
22. tell_sector
23. interpret_errors
24. setup_rw_floppy
25. seek_interrupt
26. check_wp
27. seek_floppy
28. recal_interrupt
29. unexpected_floppy_interrupt
30. floppy_interrupt
31. recalibrate_floppy
32. reset_interrupt
33. reset_fdc
34. empty
35. show_floppy
36. floppy_shutdown
37. start_motor
38. floppy_ready
39. floppy_start
40. do_wakeup
41. wait_til_done
42. generic_done
43. generic_success
44. generic_failure
45. success_and_wakeup
46. failure_and_wakeup
47. next_valid_format
48. bad_flp_intr
49. set_floppy
50. format_interrupt
51. setup_format_params
52. redo_format
53. do_format
54. request_done
55. rw_interrupt
56. buffer_chain_size
57. transfer_size
58. copy_buffer
59. make_raw_rw_request
60. redo_fd_request
61. do_fd_request
62. reset_intr
63. user_reset_fdc
64. fd_copyout
65. drive_name
66. raw_cmd_ioctl
67. invalidate_drive
68. fd_ioctl
69. set_base_type
70. config_types
71. floppy_is_wp
72. WRAPPER
73. floppy_open
74. check_floppy_change
75. floppy_revalidate
76. get_fdc_version
77. floppy_init
78. floppy_grab_irq_and_dma
79. 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 /* Configuration */
   9 /* The following does some extra sanity checks */
  10 #define SANITY
  11 
  12 /* the following is the mask of allowed drives. By default units 2 and
  13  * 3 of both floppy controllers are disabled, because switching on the
  14  * motor of these drives causes system hangs on some PCI computers. drive
  15  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
  16  * a drive is allowed. */
  17 
  18 #define ALLOWED_DRIVE_MASK 0x33
  19 
  20 
  21 /* Undefine the following if you have to floppy disk controllers:
  22  * This works at least for me; if you get two controllers working, with
  23  * drives attached to both, please mail me: Alain.Knaff@imag.fr */
  24 /* #define HAVE_2_CONTROLLERS */
  25 
  26 
  27 /* Define the following if you don't like that your drives seek audibly
  28  * after a disk change
  29  */
  30 #define SILENT_DC_CLEAR
  31 
  32 
  33 /* End of configuration */
  34 
  35 /*
  36  * 02.12.91 - Changed to static variables to indicate need for reset
  37  * and recalibrate. This makes some things easier (output_byte reset
  38  * checking etc), and means less interrupt jumping in case of errors,
  39  * so the code is hopefully easier to understand.
  40  */
  41 
  42 /*
  43  * This file is certainly a mess. I've tried my best to get it working,
  44  * but I don't like programming floppies, and I have only one anyway.
  45  * Urgel. I should check for more errors, and do more graceful error
  46  * recovery. Seems there are problems with several drives. I've tried to
  47  * correct them. No promises.
  48  */
  49 
  50 /*
  51  * As with hd.c, all routines within this file can (and will) be called
  52  * by interrupts, so extreme caution is needed. A hardware interrupt
  53  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  54  * call "floppy-on" directly, but have to set a special timer interrupt
  55  * etc.
  56  */
  57 
  58 /*
  59  * 28.02.92 - made track-buffering routines, based on the routines written
  60  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  61  */
  62 
  63 /*
  64  * Automatic floppy-detection and formatting written by Werner Almesberger
  65  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  66  * the floppy-change signal detection.
  67  */
  68 
  69 /*
  70  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  71  * FDC data overrun bug, added some preliminary stuff for vertical
  72  * recording support.
  73  *
  74  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  75  *
  76  * TODO: Errors are still not counted properly.
  77  */
  78 
  79 /* 1992/9/20
  80  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  81  * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
  82  * Christoph H. Hochst\"atter.
  83  * I have fixed the shift values to the ones I always use. Maybe a new
  84  * ioctl() should be created to be able to modify them.
  85  * There is a bug in the driver that makes it impossible to format a
  86  * floppy as the first thing after bootup.
  87  */
  88 
  89 /*
  90  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  91  * this helped the floppy driver as well. Much cleaner, and still seems to
  92  * work.
  93  */
  94 
  95 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  96  * minor modifications to allow 2.88 floppies to be run.
  97  */
  98 
  99 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
 100  * disk types.
 101  */
 102 
 103 /*
 104  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
 105  * format bug fixes, but unfortunately some new bugs too...
 106  */
 107 
 108 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 
 109  * errors to allow safe writing by specialized programs.
 110  */
 111 
 112 #define REALLY_SLOW_IO
 113 #define FLOPPY_IRQ 6
 114 #define FLOPPY_DMA 2
 115 
 116 #define DEBUGT 2
 117 
 118 #include <linux/config.h>
 119 #include <linux/sched.h>
 120 #include <linux/fs.h>
 121 #include <linux/kernel.h>
 122 #include <linux/timer.h>
 123 #include <linux/tqueue.h>
 124 #define FDPATCHES
 125 #include <linux/fdreg.h>
 126 #include <linux/fd.h>
 127 #include <linux/errno.h>
 128 #include <linux/malloc.h>
 129 #include <linux/string.h>
 130 #include <linux/fcntl.h>
 131 #include <linux/delay.h>
 132 
 133 #include <asm/dma.h>
 134 #include <asm/irq.h>
 135 #include <asm/system.h>
 136 #include <asm/io.h>
 137 #include <asm/segment.h>
 138 
 139 #define MAJOR_NR FLOPPY_MAJOR
 140 #include "blk.h"
 141 
 142 static unsigned int changed_floppies = 0xff, fake_change = 0;
 143 static int initialising=1;
 144 
 145 
 146 #ifdef HAVE_2_CONTROLLERS
 147 #define N_FDC 2
 148 #define N_DRIVE 8
 149 #else
 150 #define N_FDC 1
 151 #define N_DRIVE 4
 152 #endif
 153 
 154 #define TYPE(x) ( ((x)>>2) & 0x1f )
 155 #define DRIVE(x) ( ((x)&0x03) | (((x)&0x80 ) >> 5))
 156 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 157 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 158 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 159                                 /* reverse mapping from unit and fdc to drive */
 160 #define DP (&drive_params[current_drive])
 161 #define DRS (&drive_state[current_drive])
 162 #define DRWE (&write_errors[current_drive])
 163 #define FDCS (&fdc_state[fdc])
 164 
 165 #define UDP (&drive_params[drive])
 166 #define UDRS (&drive_state[drive])
 167 #define UDRWE (&write_errors[drive])
 168 #define UFDCS (&fdc_state[FDC(drive)])
 169 
 170 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive);
 171 
 172 #define DPRINT1(x,x1) \
 173 printk(DEVICE_NAME "%d: " x,current_drive,(x1));
 174 
 175 #define DPRINT2(x,x1,x2) \
 176 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2));
 177 
 178 #define DPRINT3(x,x1,x2,x3) \
 179 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3));
 180 
 181 /* read/write */
 182 #define COMMAND raw_cmd.cmd[0]
 183 #define DR_SELECT raw_cmd.cmd[1]
 184 #define TRACK raw_cmd.cmd[2]
 185 #define HEAD raw_cmd.cmd[3]
 186 #define SECTOR raw_cmd.cmd[4]
 187 #define SIZECODE raw_cmd.cmd[5]
 188 #define SECT_PER_TRACK raw_cmd.cmd[6]
 189 #define GAP raw_cmd.cmd[7]
 190 #define SIZECODE2 raw_cmd.cmd[8]
 191 #define NR_RW 9
 192 
 193 /* format */
 194 #define F_SIZECODE raw_cmd.cmd[2]
 195 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 196 #define F_GAP raw_cmd.cmd[4]
 197 #define F_FILL raw_cmd.cmd[5]
 198 #define NR_F 6
 199 
 200 /*
 201  * Maximum disk size (in kilobytes). This default is used whenever the
 202  * current disk size is unknown.
 203  */
 204 #define MAX_DISK_SIZE 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 /*
 235  * this struct defines the different floppy drive types.
 236  */
 237 static struct {
 238         struct floppy_drive_params params;
 239         char *name; /* name printed while booting */
 240 } default_drive_params[]= {
 241 /* NOTE: the time values in jiffies should be in msec!
 242  CMOS drive type
 243   |     Maximum data rate supported by drive type
 244   |     |   Head load time, msec
 245   |     |   |   Head unload time, msec (not used)
 246   |     |   |   |     Step rate interval, usec
 247   |     |   |   |     |    Time needed for spinup time (jiffies)
 248   |     |   |   |     |    |    Timeout for spinning down (jiffies)
 249   |     |   |   |     |    |    |   Spindown offset (where disk stops)
 250   |     |   |   |     |    |    |   |  Select delay
 251   |     |   |   |     |    |    |   |  |  RPS
 252   |     |   |   |     |    |    |   |  |  |    Max number of tracks
 253   |     |   |   |     |    |    |   |  |  |    |     Interrupt timeout
 254   |     |   |   |     |    |    |   |  |  |    |     |   Max nonintlv. sectors
 255   |     |   |   |     |    |    |   |  |  |    |     |   | -Max Errors- flags */
 256 {{0,  500, 16, 16, 8000, 100, 300,  0, 2, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 257       0, { 7, 4, 8, 2, 1, 5, 3,10}, 150, 0 }, "unknown" },
 258 
 259 {{1,  300, 16, 16, 8000, 100, 300,  0, 2, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 260       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 150, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 261 
 262 {{2,  500, 16, 16, 6000,  40, 300, 14, 2, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 263       0, { 2, 5, 6,23,10,20,11, 0}, 150, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 264 
 265 {{3,  250, 16, 16, 3000, 100, 300,  0, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 266       0, { 4,22,21,30, 3, 0, 0, 0}, 150, 4 }, "720k" }, /*3 1/2 DD*/
 267 
 268 {{4,  500, 16, 16, 4000,  40, 300, 10, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 269       0, { 7, 4,25,22,31,21,29,11}, 150, 7 }, "1.44M" }, /*3 1/2 HD*/
 270 
 271 {{5, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 272       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 273 
 274 {{6, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 275       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M" } /*3 1/2 ED*/
 276 /*    |  ---autodetected formats--   |   |      |
 277       read_track                     |   |    Name printed when booting
 278                                      |  Native format
 279                                    Frequency of disk change checks */
 280 };
 281 
 282 static struct floppy_drive_params drive_params[N_DRIVE];
 283 static struct floppy_drive_struct volatile drive_state[N_DRIVE];
 284 static struct floppy_write_errors volatile write_errors[N_DRIVE];
 285 static struct floppy_raw_cmd raw_cmd;
 286 
 287 /*
 288  * This struct defines the different floppy types.
 289  *
 290  * The 'stretch' tells if the tracks need to be doubled for some
 291  * types (ie 360kB diskette in 1.2MB drive etc). Others should
 292  * be self-explanatory.
 293  */
 294 static struct floppy_struct floppy_type[32] = {
 295         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 296         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 297         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 298         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 299         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 300         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 301         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 302         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 303         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 304         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 305 
 306         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 307         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x6C,"H1680" }, /* 11 1.68MB 3.5"   */
 308         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 309         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 310         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 311         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 312         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 313         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 314         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 315         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 316 
 317         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x6C,"h880"  }, /* 20 880KB 5.25"   */
 318         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x6C,"D1040" }, /* 21 1.04MB 3.5"   */
 319         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x6C,"D1120" }, /* 22 1.12MB 3.5"   */
 320         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x6C,"h1600" }, /* 23 1.6MB 5.25"   */
 321         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x6C,"H1760" }, /* 24 1.76MB 3.5"   */
 322         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x6C,"H1920" }, /* 25 1.92MB 3.5"   */
 323         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x6C,"E3200" }, /* 26 3.20MB 3.5"   */
 324         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x6C,"E3520" }, /* 27 3.52MB 3.5"   */
 325         { 7680,48,2,80,0,0x25,0x63,0xCF,0x6C,"E3840" }, /* 28 3.84MB 3.5"   */
 326 
 327         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x6C,"H1840" }, /* 29 1.84MB 3.5"   */
 328         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 329         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x6C,"H1600" }, /* 31 1.6MB 3.5"    */
 330 };
 331 
 332 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 333 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 334 
 335 /* Auto-detection: Disk type used until the next media change occurs. */
 336 struct floppy_struct *current_type[N_DRIVE] = {
 337         NULL, NULL, NULL, NULL
 338 #ifdef HAVE_2_CONTROLLERS
 339         ,
 340         NULL, NULL, NULL, NULL
 341 #endif
 342 };
 343 
 344 /*
 345  * User-provided type information. current_type points to
 346  * the respective entry of this array.
 347  */
 348 struct floppy_struct user_params[N_DRIVE];
 349 
 350 static int floppy_sizes[256];
 351 
 352 /*
 353  * The driver is trying to determine the correct media format
 354  * while probing is set. rw_interrupt() clears it after a
 355  * successful access.
 356  */
 357 static int probing = 0;
 358 
 359 /* Synchronization of FDC access. */
 360 #define FD_COMMAND_DETECT -2
 361 #define FD_COMMAND_NONE -1
 362 #define FD_COMMAND_ERROR 2
 363 #define FD_COMMAND_OKAY 3
 364 
 365 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 366 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 367 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 368 #define CALL(x) if( (x) == -EINTR) return -EINTR;
 369 
 370 /* Errors during formatting are counted here. */
 371 static int format_errors;
 372 
 373 /* Format request descriptor. */
 374 static struct format_descr format_req;
 375 
 376 /*
 377  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 378  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 379  * H is head unload time (1=16ms, 2=32ms, etc)
 380  */
 381 
 382 /*
 383  * Track buffer
 384  * Because these are written to by the DMA controller, they must
 385  * not contain a 64k byte boundary crossing, or data will be
 386  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 387  * Note that you must not change the sizes below without updating head.S.
 388  */
 389 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 390 #define max_buffer_sectors MAX_BUFFER_SECTORS
 391 
 392 int *errors;
 393 typedef void (*done_f)(int);
 394 struct cont_t {
 395 void (*interrupt)(void); /* this is called after the interrupt of the
 396                           * main command */
 397 void (*redo)(void); /* this is called to retry the operation */
 398 void (*error)(void); /* this is called to tally an error */
 399 done_f done; /* this is called to say if the operation has succeeded/failed */
 400 } *cont;
 401 
 402 static void floppy_start(void);
 403 static void redo_fd_request(void);
 404 static void recalibrate_floppy(void);
 405 static void seek_floppy(void);
 406 static void floppy_shutdown(void);
 407 
 408 static int floppy_grab_irq_and_dma(void);
 409 static void floppy_release_irq_and_dma(void);
 410 
 411 /*
 412  * The "reset" variable should be tested whenever an interrupt is scheduled,
 413  * after the commands have been sent. This is to ensure that the driver doesn't
 414  * get wedged when the interrupt doesn't come because of a failed command.
 415  * reset doesn't need to be tested before sending commands, because
 416  * output_byte is automatically disabled when reset is set.
 417  */
 418 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 419 static void reset_fdc(void);
 420 
 421 /*
 422  * These are global variables, as that's the easiest way to give
 423  * information to interrupts. They are the data used for the current
 424  * request.
 425  */
 426 #define NO_TRACK -1
 427 #define NEED_1_RECAL -2
 428 #define NEED_2_RECAL -3
 429 #define PROVEN_ABSENT -4
 430 
 431 /* buffer related variables */
 432 static int buffer_track = -1;
 433 static int buffer_drive = -1;
 434 static int buffer_min = -1;
 435 static int buffer_max = -1;
 436 
 437 /* fdc related variables, should end up in a struct */
 438 static struct floppy_fdc_state fdc_state[N_FDC];
 439 int fdc; /* current fdc */
 440 
 441 static struct floppy_struct * floppy = floppy_type;
 442 static unsigned char current_drive = 255;
 443 static long current_count_sectors = 0;
 444 static char *current_addr = 0;
 445 static unsigned char sector_t; /* sector in track */
 446 
 447 #ifdef DEBUGT
 448 long unsigned debugtimer;
 449 #endif
 450 
 451 /*
 452  * Debugging
 453  * =========
 454  */
 455 static inline void set_debugt(void)
     /*  */
 456 {
 457 #ifdef DEBUGT
 458         debugtimer = jiffies;
 459 #endif
 460 }
 461 
 462 static inline void debugt(char *message)
     /*  */
 463 {
 464 #ifdef DEBUGT
 465   if ( DP->flags & DEBUGT )
 466         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 467 #endif
 468 }
 469 
 470 /*
 471  * Bottom half floppy driver.
 472  * ==========================
 473  *
 474  * This part of the file contains the code talking directly to the hardware,
 475  * and also the main service loop (seek-configure-spinup-command)
 476  */
 477 
 478 /*
 479  * disk change.
 480  * This routine is responsible for maintaining the changed_floppies flag,
 481  * and the last_checked date.
 482  *
 483  * last_checked is the date of the last check which showed 'no disk change'
 484  * changed_floppies is set under two conditions:
 485  * 1. The floppy has been changed after some i/o to that floppy already
 486  *    took place.
 487  * 2. No floppy disk is in the drive.
 488  *
 489  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 490  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 491  *  each seek. If a disk is present, the disk change line should also be
 492  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 493  *  change line is set, this means either that no disk is in the drive, or
 494  *  that it has been removed since the last seek.
 495  *
 496  * This means that we really have a third possibility too:
 497  *  The floppy has been changed after the last seek.
 498  */
 499 
 500 static int disk_change(int drive)
     /*  */
 501 {
 502         if(inb_p(FD_DIR) & 0x80){
 503                 UDRS->flags |= FD_VERIFY; /* verify write protection */
 504                 
 505                 if(UDRS->maxblock || /* disk change check */
 506                    !(UDRS->flags & FD_DISK_NEWCHANGE)){/* disk presence check */
 507                         /* mark it changed or absent */
 508                         set_bit(drive,&changed_floppies);
 509 
 510                         /* invalidate its geometry */
 511                         if (UDRS->keep_data >= 0) {
 512                                 if ((DP->flags & FTD_MSG) &&
 513                                     current_type[drive] != NULL)
 514                                         DPRINT("Disk type is undefined after "
 515                                                "disk change\n");
 516                                 current_type[drive] = NULL;
 517                                 floppy_sizes[drive] = MAX_DISK_SIZE;
 518                         }
 519                 }
 520                 UDRS->flags |= FD_DISK_NEWCHANGE;
 521                 return 1;
 522         } else {
 523                 UDRS->last_checked=jiffies;
 524                 UDRS->flags &= ~FD_DISK_NEWCHANGE;
 525                 return 0;
 526         }
 527 }
 528 
 529 
 530 static int set_dor(int fdc, char mask, char data)
     /*  */
 531 {
 532         register unsigned char drive, unit, newdor,olddor;
 533 
 534         cli();
 535         olddor = FDCS->dor;
 536         newdor =  (olddor & mask) | data;
 537         if ( newdor != olddor ){
 538                 unit = olddor & 0x3;
 539                 drive = REVDRIVE(fdc,unit);
 540                 if ( olddor & ( 0x10 << unit ))
 541                         disk_change(drive);
 542                 FDCS->dor = newdor;
 543                 outb_p( newdor, FD_DOR);
 544         }
 545         sti();
 546         return olddor;
 547 }
 548 
 549 static void twaddle(void)
     /*  */
 550 {
 551         cli();
 552         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 553         outb_p(FDCS->dor, FD_DOR);
 554         sti();
 555 }
 556 
 557 /* reset all driver information about the current fdc. This is needed after
 558  * a reset, and after a raw command. */
 559 static void reset_fdc_info(int mode)
     /*  */
 560 {
 561         int drive;
 562 
 563         FDCS->spec1 = FDCS->spec2 = -1;
 564         FDCS->need_configure = 1;
 565         FDCS->perp_mode = 1;
 566         FDCS->rawcmd = 0;
 567         for ( drive = 0; drive < N_DRIVE; drive++)
 568                 if (FDC(drive) == fdc &&
 569                     UDRS->track != PROVEN_ABSENT &&
 570                     ( mode || UDRS->track != NEED_1_RECAL))
 571                         UDRS->track = NEED_2_RECAL;
 572 }
 573 
 574 /* selects the fdc and drive, and enables the fdc's input/dma. */
 575 static void set_fdc(int drive)
     /*  */
 576 {
 577         if ( drive >= 0 ){
 578                 fdc = FDC(drive);
 579                 current_drive = drive;
 580         }
 581         set_dor(fdc,~0,8);
 582 #ifdef HAVE_2_CONTROLLERS
 583         set_dor(1-fdc, ~8, 0);
 584 #endif
 585         if ( FDCS->rawcmd == 2 )
 586                 reset_fdc_info(1);
 587         if( inb_p(FD_STATUS) != STATUS_READY )
 588                 FDCS->reset = 1;
 589 }
 590 
 591 static int usage_count = 0;
 592 /* locks the driver */
 593 static int lock_fdc(int drive, int interruptible)
     /*  */
 594 {
 595 
 596         if(!usage_count){
 597                 printk("trying to lock fdc while usage count=0\n");
 598                 return -1;
 599         }
 600         floppy_grab_irq_and_dma();
 601         cli();
 602         while (fdc_busy && NO_SIGNAL)
 603                 interruptible_sleep_on(&fdc_wait);
 604         if(fdc_busy){
 605                 sti();
 606                 return -EINTR;
 607         }
 608         fdc_busy = 1;
 609         sti();
 610         command_status = FD_COMMAND_NONE;
 611         set_fdc(drive);
 612         return 0;
 613 }
 614 
 615 #define LOCK_FDC(drive,interruptible) \
 616 if(lock_fdc(drive,interruptible)) return -EINTR;
 617 
 618 /* unlocks the driver */
 619 static inline void unlock_fdc(void)
     /*  */
 620 {
 621         if (!fdc_busy)
 622                 DPRINT("FDC access conflict!\n");
 623 
 624         if ( DEVICE_INTR )
 625                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 626                         DEVICE_INTR);
 627         command_status = FD_COMMAND_NONE;
 628         timer_active &= ~(1 << FLOPPY_TIMER);
 629         fdc_busy = 0;
 630         floppy_release_irq_and_dma();
 631         wake_up(&fdc_wait);
 632 }
 633 
 634 /* switches the motor off after a given timeout */
 635 static void motor_off_callback(unsigned long nr)
     /*  */
 636 {
 637         unsigned char mask = ~(0x10 << UNIT(nr));
 638 
 639         set_dor( FDC(nr), mask, 0 );
 640 }
 641 
 642 static struct timer_list motor_off_timer[N_DRIVE] = {
 643         { NULL, NULL, 0, 0, motor_off_callback },
 644         { NULL, NULL, 0, 1, motor_off_callback },
 645         { NULL, NULL, 0, 2, motor_off_callback },
 646         { NULL, NULL, 0, 3, motor_off_callback }
 647 #ifdef HAVE_2_CONTROLLERS
 648         ,
 649         { NULL, NULL, 0, 4, motor_off_callback },
 650         { NULL, NULL, 0, 5, motor_off_callback },
 651         { NULL, NULL, 0, 6, motor_off_callback },
 652         { NULL, NULL, 0, 7, motor_off_callback }
 653 #endif
 654 };
 655 
 656 /* schedules motor off */
 657 static void floppy_off(unsigned int nr)
     /*  */
 658 {
 659         unsigned long volatile delta;
 660 
 661         del_timer(motor_off_timer+nr);
 662 
 663         /* make spindle stop in a position which minimizes spinup time
 664          * next time */
 665         if ( drive_params[nr].rps ){
 666                 delta = jiffies - drive_state[nr].first_read_date + HZ -
 667                         drive_params[nr].spindown_offset;
 668                 delta = (( delta * drive_params[nr].rps) % HZ ) /
 669                         drive_params[nr].rps;
 670                 motor_off_timer[nr].expires = drive_params[nr].spindown - delta;
 671         }
 672         add_timer(motor_off_timer+nr);
 673 }
 674 
 675 /*
 676  * cycle through all N_DRIVE floppy drives, for disk change testing.
 677  * stopping at current drive. This is done before any long operation, to
 678  * be sure to have up to date disk change information.
 679  */
 680 static void scandrives(void)
     /*  */
 681 {
 682         int i, drive, saved_drive;
 683 
 684         saved_drive = current_drive % N_DRIVE;
 685         for(i=0; i< N_DRIVE; i++){
 686                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 687                 if ( UDRS->fd_ref == 0 )
 688                         continue; /* skip closed drives */
 689                 set_fdc(drive);
 690                 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 691                     ((FDCS->dor & 0x3) != UNIT(drive)))
 692                         UDRS->select_date = jiffies;
 693                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 694                       (0x10 << UNIT(drive))))
 695                         /* switch the motor off again, if it was off to
 696                          * begin with */
 697                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 698         }
 699         current_drive = saved_drive;
 700 }
 701 
 702 typedef void (*timeout_fn)(unsigned long);
 703 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 704 
 705 /* this function makes sure that the disk stays in the drive during the
 706  * transfer */
 707 static void fd_watchdog(void)
     /*  */
 708 {
 709         if ( disk_change(current_drive) ){
 710                 DPRINT("disk removed during i/o\n");
 711                 floppy_shutdown();
 712         } else {                
 713                 del_timer(&fd_timer);
 714                 fd_timer.function = (timeout_fn) fd_watchdog;
 715                 fd_timer.expires = 10;
 716                 add_timer(&fd_timer);
 717         }
 718 }
 719 
 720 static void main_command_interrupt(void)
     /*  */
 721 {
 722         del_timer(&fd_timer);
 723         cont->interrupt();
 724 }
 725 
 726 /* waits for a delay (spinup or select) to pass */
 727 static int wait_for_completion(int nr, int delay, timeout_fn function)
     /*  */
 728 {
 729         if ( FDCS->reset ){
 730                 reset_fdc(); /* do the reset during sleep to win time
 731                               * if we don't need to sleep, it's a good
 732                               * occasion anyways */
 733                 return 1;
 734         }
 735 
 736         if ( jiffies < delay ){
 737                 del_timer(&fd_timer);
 738                 fd_timer.function = function;
 739                 fd_timer.expires = delay  - jiffies;
 740                 add_timer(&fd_timer);
 741                 return 1;
 742         }
 743         return 0;
 744 }
 745 
 746 static void setup_DMA(void)
     /*  */
 747 {
 748 #ifdef SANITY
 749         if ((!CURRENT ||
 750              CURRENT->buffer != current_addr ||
 751              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 752             (current_addr < floppy_track_buffer ||
 753              current_addr + raw_cmd.length >
 754              floppy_track_buffer + 1024 * max_buffer_sectors)){
 755                 printk("bad address. start=%p lg=%lx tb=%p\n",
 756                        current_addr, raw_cmd.length, floppy_track_buffer);
 757                 if ( CURRENT ){
 758                         printk("buffer=%p nr=%lx cnr=%lx\n",
 759                                CURRENT->buffer, CURRENT->nr_sectors,
 760                                CURRENT->current_nr_sectors);
 761                 }
 762                 cont->done(0);
 763                 FDCS->reset=1;
 764                 return;
 765         }
 766         if ((long) current_addr % 512 ){
 767                 printk("non aligned address: %p\n", current_addr );
 768                 cont->done(0);
 769                 FDCS->reset=1;
 770                 return;
 771         }
 772         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 773             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 774                 printk("DMA crossing 64-K boundary %p-%p\n",
 775                        current_addr, current_addr + raw_cmd.length);
 776                 cont->done(0);
 777                 FDCS->reset=1;
 778                 return;
 779         }
 780 
 781 #endif
 782         cli();
 783         disable_dma(FLOPPY_DMA);
 784         clear_dma_ff(FLOPPY_DMA);
 785         set_dma_mode(FLOPPY_DMA,
 786                      (raw_cmd.flags & FD_RAW_READ)?
 787                      DMA_MODE_READ : DMA_MODE_WRITE);
 788         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 789         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 790         enable_dma(FLOPPY_DMA);
 791         sti();
 792 }
 793 
 794 /* sends a command byte to the fdc */
 795 static int output_byte(char byte)
     /*  */
 796 {
 797         int counter;
 798         unsigned char status;
 799 
 800         if (FDCS->reset)
 801                 return -1;
 802         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 803                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 804                 if (!(status & STATUS_READY))
 805                         continue;
 806                 if (status == STATUS_READY){
 807                         outb_p(byte,FD_DATA);
 808                         return 0;
 809                 } else
 810                         break;
 811         }
 812         FDCS->reset = 1;
 813         if ( !initialising )
 814                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
 815                         byte, status);
 816         return -1;
 817 }
 818 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 819 
 820 /* gets the response from the fdc */
 821 static int result(void)
     /*  */
 822 {
 823         int i = 0, counter, status;
 824 
 825         if (FDCS->reset)
 826                 return -1;
 827         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 828                 status = inb_p(FD_STATUS)&
 829                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 830                 if (!(status & STATUS_READY))
 831                         continue;
 832                 if (status == STATUS_READY)
 833                         return i;
 834                 if (status & STATUS_DMA )
 835                         break;
 836                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 837                         if (i >= MAX_REPLIES) {
 838                                 DPRINT("floppy_stat reply overrun\n");
 839                                 break;
 840                         }
 841                         reply_buffer[i++] = inb_p(FD_DATA);
 842                 }
 843         }
 844         FDCS->reset = 1;
 845         if ( !initialising )
 846                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
 847                         status, fdc, i);
 848         return -1;
 849 }
 850 
 851 /* Set perpendicular mode as required, based on data rate, if supported.
 852  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 853  */
 854 static inline void perpendicular_mode(void)
     /*  */
 855 {
 856         unsigned char perp_mode;
 857 
 858         if (!floppy)
 859                 return;
 860         if (floppy->rate & 0x40){
 861                 switch(raw_cmd.rate){
 862                 case 0:
 863                         perp_mode=2;
 864                         break;
 865                 case 3:
 866                         perp_mode=3;
 867                         break;
 868                 default:
 869                         DPRINT("Invalid data rate for perpendicular mode!\n");
 870                         cont->done(0);
 871                         FDCS->reset = 1; /* convenient way to return to
 872                                           * redo without to much hassle (deep
 873                                           * stack et al. */
 874                         return;
 875                 }
 876         } else
 877                 perp_mode = 0;
 878                         
 879         if ( FDCS->perp_mode == perp_mode )
 880                 return;
 881         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 882                 output_byte(FD_PERPENDICULAR);
 883                 output_byte(perp_mode);
 884                 FDCS->perp_mode = perp_mode;
 885         } else if (perp_mode) {
 886                 DPRINT("perpendicular mode not supported by this FDC.\n");
 887         }
 888 } /* perpendicular_mode */
 889 
 890 #define NOMINAL_DTR 500
 891 
 892 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
 893  * head load time, and DMA disable flag to values needed by floppy.
 894  *
 895  * The value "dtr" is the data transfer rate in Kbps.  It is needed
 896  * to account for the data rate-based scaling done by the 82072 and 82077
 897  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 898  * 8272a).
 899  *
 900  * Note that changing the data transfer rate has a (probably deleterious)
 901  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 902  * fdc_specify is called again after each data transfer rate
 903  * change.
 904  *
 905  * srt: 1000 to 16000 in microseconds
 906  * hut: 16 to 240 milliseconds
 907  * hlt: 2 to 254 milliseconds
 908  *
 909  * These values are rounded up to the next highest available delay time.
 910  */
 911 static void fdc_specify(void)
     /*  */
 912 {
 913         unsigned char spec1, spec2;
 914         int srt, hlt, hut;
 915         unsigned long dtr = NOMINAL_DTR;
 916         unsigned long scale_dtr = NOMINAL_DTR;
 917         int hlt_max_code = 0x7f;
 918         int hut_max_code = 0xf;
 919 
 920         if (FDCS->need_configure && FDCS->has_fifo) {
 921                 if ( FDCS->reset )
 922                         return;
 923                 /* Turn on FIFO for 82077-class FDC (improves performance) */
 924                 /* TODO: lock this in via LOCK during initialization */
 925                 output_byte(FD_CONFIGURE);
 926                 output_byte(0);
 927                 output_byte(0x1A);      /* FIFO on, polling off, 10 byte threshold */
 928                 output_byte(0);         /* precompensation from track 0 upwards */
 929                 if ( FDCS->reset ){
 930                         FDCS->has_fifo=0;
 931                         return;
 932                 }
 933                 FDCS->need_configure = 0;
 934                 /*DPRINT("FIFO enabled\n");*/
 935         }
 936 
 937         switch (raw_cmd.rate & 0x03) {
 938         case 3:
 939                 dtr = 1000;
 940                 break;
 941         case 1:
 942                 dtr = 300;
 943                 break;
 944         case 2:
 945                 dtr = 250;
 946                 break;
 947         }
 948 
 949         if (FDCS->version >= FDC_82072) {
 950                 scale_dtr = dtr;
 951                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
 952                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
 953         }
 954 
 955         /* Convert step rate from microseconds to milliseconds and 4 bits */
 956         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 957         if (srt > 0xf)
 958                 srt = 0xf;
 959         else if (srt < 0)
 960                 srt = 0;
 961 
 962         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 963         if (hlt < 0x01)
 964                 hlt = 0x01;
 965         else if (hlt > 0x7f)
 966                 hlt = hlt_max_code;
 967 
 968         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 969         if (hut < 0x1)
 970                 hut = 0x1;
 971         else if (hut > 0xf)
 972                 hut = hut_max_code;
 973 
 974         spec1 = (srt << 4) | hut;
 975         spec2 = (hlt << 1);
 976 
 977         /* If these parameters did not change, just return with success */
 978         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
 979                 /* Go ahead and set spec1 and spec2 */
 980                 output_byte(FD_SPECIFY);
 981                 output_byte(FDCS->spec1 = spec1);
 982                 output_byte(FDCS->spec2 = spec2);
 983         }
 984 } /* fdc_specify */
 985 
 986 /* Set the FDC's data transfer rate on behalf of the specified drive.
 987  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
 988  * of the specify command (i.e. using the fdc_specify function).
 989  */
 990 static void fdc_dtr(void)
     /*  */
 991 {
 992         /* If data rate not already set to desired value, set it. */
 993         if ( raw_cmd.rate == FDCS->dtr)
 994                 return;
 995         
 996         /* Set dtr */
 997         outb_p(raw_cmd.rate, FD_DCR);
 998         
 999         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1000          * need a stabilization period of several milliseconds to be
1001          * enforced after data rate changes before R/W operations.
1002          * Pause 5 msec to avoid trouble.
1003          */
1004         udelay(5000);
1005         FDCS->dtr = raw_cmd.rate;
1006 } /* fdc_dtr */
1007 
1008 static void tell_sector(void)
     /*  */
1009 {
1010         printk(": track %d, head %d, sector %d, size %d",
1011                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1012 } /* tell_sector */
1013 
1014 
1015 /*
1016  * Ok, this error interpreting routine is called after a
1017  * DMA read/write has succeeded
1018  * or failed, so we check the results, and copy any buffers.
1019  * hhb: Added better error reporting.
1020  * ak: Made this into a separate routine.
1021  */
1022 static int interpret_errors(void)
     /*  */
1023 {
1024         char bad;
1025 
1026         if (inr!=7) {
1027                 DPRINT("-- FDC reply error");
1028                 FDCS->reset = 1;
1029                 return 1;
1030         }
1031 
1032         /* check IC to find cause of interrupt */
1033         switch ((ST0 & ST0_INTR)>>6) {
1034                 case 1: /* error occured during command execution */
1035                         bad = 1;
1036                         if (ST1 & ST1_WP) {
1037                                 DPRINT("Drive is write protected\n");
1038                                 DRS->flags &= ~FD_DISK_WRITABLE;
1039                                 cont->done(0);
1040                                 bad = 2;
1041                         } else if (ST1 & ST1_ND) {
1042                                 DRS->flags |= FD_NEED_TWADDLE;
1043                         } else if (ST1 & ST1_OR) {
1044                                 if (DP->flags & FTD_MSG )
1045                                         DPRINT("Over/Underrun - retrying\n");
1046                                 bad = 0;
1047                         }else if(*errors >= DP->max_errors.reporting){
1048                                 DPRINT("");
1049                                 if (ST0 & ST0_ECE) {
1050                                         printk("Recalibrate failed!");
1051                                 } else if (ST2 & ST2_CRC) {
1052                                         printk("data CRC error");
1053                                         tell_sector();
1054                                 } else if (ST1 & ST1_CRC) {
1055                                         printk("CRC error");
1056                                         tell_sector();
1057                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1058                                         if (!probing) {
1059                                                 printk("sector not found");
1060                                                 tell_sector();
1061                                         } else
1062                                                 printk("probe failed...");
1063                                 } else if (ST2 & ST2_WC) {      /* seek error */
1064                                         printk("wrong cylinder");
1065                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1066                                         printk("bad cylinder");
1067                                 } else {
1068                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1069                                         tell_sector();
1070                                 }
1071                                 printk("\n");
1072 
1073                         }
1074                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1075                                 /* wrong cylinder => recal */
1076                                 DRS->track = NEED_2_RECAL;
1077                         return bad;
1078                 case 2: /* invalid command given */
1079                         DPRINT("Invalid FDC command given!\n");
1080                         cont->done(0);
1081                         return 2;
1082                 case 3:
1083                         DPRINT("Abnormal termination caused by polling\n");
1084                         cont->error();
1085                         return 2;
1086                 default: /* (0) Normal command termination */
1087                         return 0;
1088         }
1089 }
1090 
1091 /*
1092  * This routine is called when everything should be correctly set up
1093  * for the transfer (ie floppy motor is on, the correct floppy is
1094  * selected, and the head is sitting on the right track).
1095  */
1096 static void setup_rw_floppy(void)
     /*  */
1097 {
1098         int i,ready_date,r, flags,dflags;
1099         timeout_fn function;
1100 
1101         flags = raw_cmd.flags;
1102         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1103                 flags |= FD_RAW_INTR;
1104 
1105         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1106                 ready_date = DRS->spinup_date + DP->spinup;             
1107                 /* If spinup will take a long time, rerun scandrives
1108                  * again just before spinup completion. Beware that
1109                  * after scandrives, we must again wait for selection.
1110                  */
1111                 if ( ready_date > jiffies + DP->select_delay){
1112                         ready_date -= DP->select_delay;
1113                         function = (timeout_fn) floppy_start;
1114                 } else
1115                         function = (timeout_fn) setup_rw_floppy;
1116 
1117                 /* wait until the floppy is spinning fast enough */
1118                 if (wait_for_completion(current_drive,ready_date,function))
1119                         return;
1120         }
1121         dflags = DRS->flags;
1122 
1123         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1124                 setup_DMA();
1125         
1126         if ( flags & FD_RAW_INTR )
1127                 SET_INTR(main_command_interrupt);
1128 
1129         r=0;
1130         for(i=0; i< raw_cmd.cmd_count; i++)
1131                 r|=output_byte( raw_cmd.cmd[i] );
1132 
1133 #ifdef DEBUGT
1134         debugt("rw_command: ");
1135 #endif
1136         if ( r ){
1137                 reset_fdc();
1138                 return;
1139         }
1140 
1141         if ( ! ( flags & FD_RAW_INTR )){
1142                 inr = result();
1143                 cont->interrupt();
1144         } else if ( flags & FD_RAW_NEED_DISK )
1145                 fd_watchdog();
1146 }
1147 
1148 #ifdef SILENT_DC_CLEAR
1149 static int blind_seek;
1150 #endif
1151 
1152 /*
1153  * This is the routine called after every seek (or recalibrate) interrupt
1154  * from the floppy controller.
1155  */
1156 static void seek_interrupt(void)
     /*  */
1157 {
1158 #ifdef DEBUGT
1159         debugt("seek interrupt:");
1160 #endif
1161 #ifdef SILENT_DC_CLEAR
1162         set_dor(fdc, ~0,  (0x10 << UNIT(current_drive)));
1163 #endif
1164         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1165                 DPRINT("seek failed\n");
1166                 DRS->track = NEED_2_RECAL;
1167                 cont->error();
1168                 cont->redo();
1169                 return;
1170         }
1171         if (DRS->track >= 0 && DRS->track != ST1    
1172 #ifdef SILENT_DC_CLEAR
1173             && !blind_seek
1174 #endif
1175             )
1176                 DRS->flags &= ~FD_DISK_NEWCHANGE; /* effective seek */
1177         DRS->track = ST1;
1178         seek_floppy();
1179 }
1180 
1181 static void check_wp(void)
     /*  */
1182 {
1183         if (DRS->flags & FD_VERIFY) {
1184                 /* check write protection */
1185                 output_byte( FD_GETSTATUS );
1186                 output_byte( UNIT(current_drive) );
1187                 if ( result() != 1 ){
1188                         FDCS->reset = 1;
1189                         return;
1190                 }
1191                 DRS->flags &= ~(FD_VERIFY | FD_DISK_WRITABLE | FD_NEED_TWADDLE);
1192 
1193                 if (!( ST3  & 0x40))
1194                         DRS->flags |= FD_DISK_WRITABLE;
1195         }
1196 }
1197 
1198 static void seek_floppy(void)
     /*  */
1199 {
1200         int track;
1201 
1202 #ifdef SILENT_DC_CLEAR
1203         blind_seek=0;
1204 #endif
1205         disk_change(current_drive);
1206         if ((raw_cmd.flags & FD_RAW_NEED_DISK) &&
1207             test_bit(current_drive,&changed_floppies)){
1208                 /* the media changed flag should be cleared after the seek.
1209                  * If it isn't, this means that there is really no disk in
1210                  * the drive.
1211                  */
1212                 cont->done(0);
1213                 cont->redo();
1214                 return;
1215         }
1216         if ( DRS->track <= NEED_1_RECAL ){
1217                 recalibrate_floppy();
1218                 return;
1219         } else if ((DRS->flags & FD_DISK_NEWCHANGE) &&
1220                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1221                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1222                 /* we seek to clear the media-changed condition. Does anybody
1223                  * know a more elegant way, which works on all drives? */
1224                 if ( raw_cmd.track )
1225                         track = raw_cmd.track - 1;
1226                 else {
1227 #ifdef SILENT_DC_CLEAR
1228                         set_dor(fdc, ~ (0x10 << UNIT(current_drive)), 0);
1229                         blind_seek = 1;
1230 #endif
1231                         track = 1;
1232                 }
1233         } else {
1234                 check_wp();
1235                 if (raw_cmd.track != DRS->track)
1236                         track = raw_cmd.track;
1237                 else {
1238                         setup_rw_floppy();
1239                         return;
1240                 }
1241         }
1242 
1243 #ifndef SILENT_DC_CLEAR
1244         if ( !track && DRS->track >= 0 && DRS->track < 80 ){
1245                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1246                 /* if we go to track 0 anyways, we can just as well use
1247                  * recalibrate */
1248                 recalibrate_floppy();
1249         } else 
1250 #endif
1251         {
1252                 SET_INTR(seek_interrupt);
1253                 output_byte(FD_SEEK);
1254                 output_byte(UNIT(current_drive));
1255                 LAST_OUT(track);
1256 #ifdef DEBUGT
1257                 debugt("seek command:");
1258 #endif
1259         }
1260 }
1261 
1262 static void recal_interrupt(void)
     /*  */
1263 {
1264 #ifdef DEBUGT
1265         debugt("recal interrupt:");
1266 #endif
1267         if (inr !=2 )
1268                 FDCS->reset = 1;
1269         else if (ST0 & ST0_ECE) {
1270                 switch(DRS->track){
1271                 case PROVEN_ABSENT:
1272 #ifdef DEBUGT
1273                         debugt("recal interrupt proven absent:");
1274 #endif
1275                         /* fall through */
1276                 case NEED_1_RECAL:
1277 #ifdef DEBUGT
1278                         debugt("recal interrupt need 1 recal:");
1279 #endif
1280                         /* after a second recalibrate, we still haven't
1281                          * reached track 0. Probably no drive */
1282                         DRS->track = PROVEN_ABSENT;
1283                         cont->done(0);
1284                         cont->redo();
1285                         return;
1286                 case NEED_2_RECAL:
1287 #ifdef DEBUGT
1288                         debugt("recal interrupt need 2 recal:");
1289 #endif
1290                         /* If we already did a recalibrate, and we are not at
1291                          * track 0, this means we have moved. (The only way
1292                          * not to move at recalibration is to be already at
1293                          * track 0.) Clear the new change flag
1294                          */
1295                         DRS->flags &= ~FD_DISK_NEWCHANGE;
1296                         /* fall through */
1297                 default:
1298 #ifdef DEBUGT
1299                         debugt("recal interrupt default:");
1300 #endif
1301                         /* Recalibrate moves the head by at most 80 steps. If
1302                          * after one recalibrate we don't have reached track
1303                          * 0, this might mean that we started beyond track 80.
1304                          * Try again.
1305                          */
1306                         DRS->track = NEED_1_RECAL;
1307                         break;
1308                 }
1309         } else
1310                 DRS->track = ST1;
1311         seek_floppy();
1312 }
1313 
1314 /*
1315  * Unexpected interrupt - Print as much debugging info as we can...
1316  * All bets are off...
1317  */
1318 static void unexpected_floppy_interrupt(void)
     /*  */
1319 {
1320         int i;
1321         if ( initialising )
1322                 return;
1323         DPRINT("unexpected interrupt\n");
1324         if ( inr >= 0 )
1325                 for(i=0; i<inr; i++)
1326                         printk("%d %x\n", i, reply_buffer[i] );
1327         while(1){
1328                 output_byte(FD_SENSEI);
1329                 inr=result();
1330                 if ( inr != 2 )
1331                         break;
1332                 printk("sensei\n");
1333                 for(i=0; i<inr; i++)
1334                         printk("%d %x\n", i, reply_buffer[i] );
1335         }
1336         FDCS->reset = 1;
1337 }
1338 
1339 struct tq_struct floppy_tq = 
1340 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1341 
1342 /* interrupt handler */
1343 static void floppy_interrupt(int unused)
     /*  */
1344 {
1345         void (*handler)(void) = DEVICE_INTR;
1346 
1347         CLEAR_INTR;
1348         if ( fdc >= N_FDC ){ /* we don't even know which FDC is the culprit */
1349                 printk("floppy interrupt on bizarre fdc\n");
1350                 return;
1351         }
1352         inr = result();
1353         if (!handler){
1354                 unexpected_floppy_interrupt();
1355                 return;
1356         }
1357         if ( inr == 0 ){
1358                 do {
1359                         output_byte(FD_SENSEI);
1360                         inr = result();
1361                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1362         }
1363         floppy_tq.routine = (void *)(void *) handler;
1364         queue_task_irq(&floppy_tq, &tq_timer);
1365 }
1366 
1367 static void recalibrate_floppy(void)
     /*  */
1368 {
1369 #ifdef DEBUGT
1370         debugt("recalibrate floppy:");
1371 #endif
1372         SET_INTR(recal_interrupt);
1373         output_byte(FD_RECALIBRATE);
1374         LAST_OUT(UNIT(current_drive));
1375 }
1376 
1377 /*
1378  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1379  */
1380 static void reset_interrupt(void)
     /*  */
1381 {
1382 #ifdef DEBUGT
1383         debugt("reset interrupt:");
1384 #endif
1385         fdc_specify();          /* reprogram fdc */
1386         result();               /* get the status ready for set_fdc */
1387         if ( FDCS->reset )
1388                 cont->error(); /* a reset just after a reset. BAD! */
1389         cont->redo();
1390 }
1391 
1392 /*
1393  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1394  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1395  */
1396 static void reset_fdc(void)
     /*  */
1397 {
1398         SET_INTR(reset_interrupt);
1399         FDCS->reset = 0;
1400         reset_fdc_info(0);
1401         if ( FDCS->version >= FDC_82077 )
1402                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1403         else {
1404                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1405                 udelay(FD_RESET_DELAY);
1406                 outb(FDCS->dor, FD_DOR);
1407         }
1408 }
1409 
1410 static void empty(void)
     /*  */
1411 {
1412 }
1413 
1414 void show_floppy(void)
     /*  */
1415 {
1416         int i;
1417 
1418         printk("\n");
1419         printk("floppy driver state\n");
1420         printk("-------------------\n");
1421         for(i=0; i<N_FDC; i++){
1422                 printk("dor %d = %x\n", i, fdc_state[i].dor );
1423                 outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1424                 udelay(1000); /* maybe we'll catch an interrupt... */
1425         }
1426         printk("status=%x\n", inb_p(FD_STATUS));
1427         printk("fdc_busy=%d\n", fdc_busy);
1428         if( DEVICE_INTR)
1429                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1430         if(floppy_tq.sync)
1431                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1432         if(fd_timer.prev)
1433                 printk("fd_timer.function=%p\n", fd_timer.function);
1434         if( timer_active & (1 << FLOPPY_TIMER)){
1435                 printk("timer_table=%p\n",timer_table[FLOPPY_TIMER].fn);
1436                 printk("expires=%ld\n",timer_table[FLOPPY_TIMER].expires);
1437                 printk("now=%ld\n",jiffies);
1438         }
1439         printk("cont=%p\n", cont);
1440         printk("CURRENT=%p\n", CURRENT);
1441         printk("command_status=%d\n", command_status);
1442         printk("\n");
1443 }
1444 
1445 static void floppy_shutdown(void)
     /*  */
1446 {
1447         CLEAR_INTR;
1448         floppy_tq.routine = (void *)(void *) empty;
1449         del_timer( &fd_timer);
1450 
1451         disable_dma(FLOPPY_DMA);
1452         /* avoid dma going to a random drive after shutdown */
1453 
1454         if(!initialising)
1455                 DPRINT("floppy timeout\n");
1456         FDCS->reset = 1;
1457         cont->done(0);
1458         cont->redo(); /* this will recall reset when needed */
1459 }
1460 
1461 /* start motor, check media-changed condition and write protection */
1462 static void start_motor(void)
     /*  */
1463 {
1464         int mask, data;
1465 
1466         mask = 0xfc;
1467         data = UNIT(current_drive);
1468         if ( (FDCS->dor & 0x03) != UNIT(current_drive) )
1469                 /* notes select time if floppy is not yet selected */
1470                 DRS->select_date = jiffies;
1471 
1472         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1473                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1474                         set_debugt();
1475                         /* no read since this drive is running */
1476                         DRS->first_read_date = 0;
1477                         /* note motor start time if motor is not yet running */
1478                         DRS->spinup_date = jiffies;
1479                         data |= (0x10 << UNIT(current_drive));
1480                 }
1481         } else
1482                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1483                         mask &= ~(0x10 << UNIT(current_drive));
1484 
1485         /* starts motor and selects floppy */
1486         del_timer(motor_off_timer + current_drive);
1487         set_dor( fdc, mask, data);
1488         if( raw_cmd.flags & FD_RAW_NO_MOTOR)
1489                 return;
1490 
1491         if(disk_change(current_drive))
1492                 twaddle(); /* this clears the dcl on certain drive/controller
1493                             * combinations */
1494 
1495         return;
1496 }
1497 
1498 static void floppy_ready(void)
     /*  */
1499 {
1500         CHECK_RESET;
1501         start_motor();
1502 
1503         /* wait_for_completion also schedules reset if needed. */
1504         if(wait_for_completion(current_drive,
1505                                DRS->select_date+DP->select_delay,
1506                                (timeout_fn) floppy_ready))
1507                 return;
1508         fdc_dtr();
1509         if ( raw_cmd.flags & FD_RAW_NEED_SEEK ){
1510                 perpendicular_mode();
1511                 fdc_specify(); /* must be done here because of hut, hlt ... */
1512                 seek_floppy();
1513         } else
1514                 setup_rw_floppy();
1515 }
1516 
1517 static void floppy_start(void)
     /*  */
1518 {
1519         timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
1520         timer_active |= 1 << FLOPPY_TIMER;
1521         scandrives();
1522         floppy_ready();
1523 }
1524 
1525 /*
1526  * ========================================================================
1527  * here ends the bottom half. Exported routines are:
1528   * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1529  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1530  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1531  * and set_dor.
1532  * ========================================================================
1533  */
1534 /*
1535  * General purpose continuations.
1536  * ==============================
1537  */
1538 
1539 static void do_wakeup(void)
     /*  */
1540 {
1541         timer_active &= ~(1 << FLOPPY_TIMER);
1542         cont = 0;
1543         command_status += 2;
1544         wake_up(&command_done);
1545 }
1546 
1547 static struct cont_t wakeup_cont={
1548         empty,
1549         do_wakeup,
1550         empty,
1551         (done_f)empty
1552 };
1553 
1554 static int wait_til_done( void (*handler)(void ), int interruptible )
     /*  */
1555 {
1556         int ret;
1557 
1558         floppy_tq.routine = (void *)(void *) handler;
1559         queue_task(&floppy_tq, &tq_timer);
1560 
1561         cli();
1562         while(command_status < 2 && NO_SIGNAL)
1563                 if (current->pid)
1564                         interruptible_sleep_on(&command_done);
1565                 else {
1566                         sti();
1567                         run_task_queue(&tq_timer);
1568                         cli();
1569                 }
1570         if(command_status < 2){
1571                 sti();
1572                 floppy_shutdown();
1573                 redo_fd_request();
1574                 return -EINTR;
1575         }
1576         sti();
1577 
1578         if ( FDCS->reset )
1579                 command_status = FD_COMMAND_ERROR;
1580         if ( command_status == FD_COMMAND_OKAY )
1581                 ret=0;
1582         else
1583                 ret=-EIO;
1584         command_status = FD_COMMAND_NONE;
1585         return ret;
1586 }
1587 
1588 static void generic_done(int result)
     /*  */
1589 {
1590         command_status = result;
1591         cont = &wakeup_cont;
1592 }
1593 
1594 static void generic_success(void)
     /*  */
1595 {
1596         generic_done(1);
1597 }
1598 
1599 static void generic_failure(void)
     /*  */
1600 {
1601         generic_done(0);
1602 }
1603 
1604 static void success_and_wakeup(void)
     /*  */
1605 {
1606         generic_success();
1607         do_wakeup();
1608 }
1609 
1610 static void failure_and_wakeup(void)
     /*  */
1611 {
1612         generic_failure();
1613         do_wakeup();
1614 }
1615 
1616 /*
1617  * formatting and rw support.
1618  * ==========================
1619  */
1620 
1621 static int next_valid_format(void)
     /*  */
1622 {
1623         int probed_format;
1624         while(1){
1625                 probed_format = DRS->probed_format;
1626                 if ( probed_format > N_DRIVE ||
1627                     ! DP->autodetect[probed_format] ){
1628                         DRS->probed_format = 0;
1629                         return 1;
1630                 }
1631                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1632                         DRS->probed_format = probed_format;
1633                         return 0;
1634                 }
1635                 probed_format++;
1636         }
1637 }
1638 
1639 static void bad_flp_intr(void)
     /*  */
1640 {
1641         if ( probing ){
1642                 DRS->probed_format++;
1643                 if ( !next_valid_format())
1644                         return;
1645         }
1646         (*errors)++;
1647         if (*errors > DRWE->badness)
1648                 DRWE->badness = *errors;
1649         if (*errors > DP->max_errors.abort)
1650                 cont->done(0);
1651         if (*errors > DP->max_errors.reset)
1652                 FDCS->reset = 1;
1653         else if (*errors > DP->max_errors.recal)
1654                 DRS->track = NEED_2_RECAL;
1655 }
1656 
1657 static void set_floppy(int device)
     /*  */
1658 {
1659         if (TYPE(device))
1660                 floppy = TYPE(device) + floppy_type;
1661         else
1662                 floppy = current_type[ DRIVE(device) ];
1663 }
1664 
1665 /*
1666  * formatting and support.
1667  * =======================
1668  */
1669 static void format_interrupt(void)
     /*  */
1670 {
1671         switch (interpret_errors()){
1672         case 1:
1673                 cont->error();
1674         case 2:
1675                 break;
1676         case 0:
1677                 cont->done(1);
1678         }
1679         cont->redo();
1680 }
1681 
1682 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
1683 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
1684 #define CT(x) ( (x) | 0x40 )
1685 static void setup_format_params(void)
     /*  */
1686 {
1687         struct fparm {
1688                 unsigned char track,head,sect,size;
1689         } *here = (struct fparm *)floppy_track_buffer;
1690         int il,n;
1691         int count,head_shift,track_shift;
1692 
1693         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1694                 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
1695         raw_cmd.rate = floppy->rate & 0x3;
1696         raw_cmd.cmd_count = NR_F;
1697         COMMAND = FM_MODE(floppy,FD_FORMAT);
1698         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1699         F_SIZECODE = FD_SIZECODE(floppy);
1700         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1701         F_GAP = floppy->fmt_gap;
1702         F_FILL = FD_FILL_BYTE;
1703 
1704         current_addr = floppy_track_buffer;
1705         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1706 
1707         /* allow for about 30ms for data transport per track */
1708         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1709 
1710         /* a ``cylinder'' is two tracks plus a little stepping time */
1711         track_shift = 2 * head_shift + 1;
1712 
1713         /* position of logical sector 1 on this track */
1714         n = (track_shift * format_req.track + head_shift * format_req.head )
1715                 % F_SECT_PER_TRACK;
1716 
1717         /* determine interleave */
1718         il = 1;
1719         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
1720                 il++;
1721 
1722         /* initialize field */
1723         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1724                 here[count].track = format_req.track;
1725                 here[count].head = format_req.head;
1726                 here[count].sect = 0;
1727                 here[count].size = F_SIZECODE;
1728         }
1729         /* place logical sectors */
1730         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1731                 here[n].sect = count;
1732                 n = (n+il) % F_SECT_PER_TRACK;
1733                 if (here[n].sect) { /* sector busy, find next free sector */
1734                         ++n;
1735                         if (n>= F_SECT_PER_TRACK) {
1736                                 n-=F_SECT_PER_TRACK;
1737                                 while (here[n].sect) ++n;
1738                         }
1739                 }
1740         }
1741 }
1742 
1743 static void redo_format(void)
     /*  */
1744 {
1745         raw_cmd.track = format_req.track << floppy->stretch;
1746         buffer_track = -1;
1747         setup_format_params();
1748         floppy_start();
1749 #ifdef DEBUGT
1750         debugt("queue format request");
1751 #endif
1752 }
1753 
1754 static struct cont_t format_cont={
1755         format_interrupt,
1756         redo_format,
1757         bad_flp_intr,
1758         generic_done };
1759 
1760 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1761 {
1762         int okay;
1763 
1764         LOCK_FDC(DRIVE(device),1);
1765         set_floppy(device);
1766         if (!floppy ||
1767             tmp_format_req->track >= floppy->track ||
1768             tmp_format_req->head >= floppy->head){
1769                 redo_fd_request();
1770                 return -EINVAL;
1771         }
1772         format_req = *tmp_format_req;
1773         format_errors = 0;
1774         cont = &format_cont;
1775         errors = &format_errors;
1776         CALL(okay=wait_til_done(redo_format,1));
1777         redo_fd_request();
1778         return okay;
1779 }
1780 
1781 /*
1782  * Buffer read/write and support
1783  * =============================
1784  */
1785 
1786 /* new request_done. Can handle physical sectors which are smaller than a
1787  * logical buffer */
1788 static void request_done(int uptodate)
     /*  */
1789 {
1790         int block;
1791 
1792         probing = 0;
1793         timer_active &= ~(1 << FLOPPY_TIMER);
1794 
1795         if (!CURRENT){
1796                 DPRINT("request list destroyed in floppy request done\n");
1797                 return;
1798         }
1799         if (uptodate){
1800                 /* maintain values for invalidation on geometry
1801                    change */
1802                 block = current_count_sectors + CURRENT->sector;
1803                 if (block > DRS->maxblock)
1804                         DRS->maxblock=block;
1805                 if ( block > floppy->sect)
1806                         DRS->maxtrack = 1;
1807 
1808                 /* unlock chained buffers */
1809                 while (current_count_sectors && CURRENT &&
1810                        current_count_sectors >= CURRENT->current_nr_sectors ){
1811                         current_count_sectors -= CURRENT->current_nr_sectors;
1812                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1813                         CURRENT->sector += CURRENT->current_nr_sectors;
1814                         end_request(1);
1815                 }
1816                 if ( current_count_sectors && CURRENT){
1817                         /* "unlock" last subsector */
1818                         CURRENT->buffer += current_count_sectors <<9;
1819                         CURRENT->current_nr_sectors -= current_count_sectors;
1820                         CURRENT->nr_sectors -= current_count_sectors;
1821                         CURRENT->sector += current_count_sectors;
1822                         return;
1823                 }
1824 
1825                 if ( current_count_sectors && ! CURRENT )
1826                         DPRINT("request list destroyed in floppy request done\n");
1827 
1828         } else {
1829                 if(CURRENT->cmd == WRITE) {
1830                         /* record write error information */
1831                         DRWE->write_errors++;
1832                         if(DRWE->write_errors == 1) {
1833                                 DRWE->first_error_sector = CURRENT->sector;
1834                                 DRWE->first_error_generation = DRS->generation;
1835                         }
1836                         DRWE->last_error_sector = CURRENT->sector;
1837                         DRWE->last_error_generation = DRS->generation;
1838                 }
1839                 end_request(0);
1840         }
1841 }
1842 
1843 /* Interrupt handler evaluating the result of the r/w operation */
1844 static void rw_interrupt(void)
     /*  */
1845 {
1846         int nr_sectors, ssize;
1847 
1848         if ( ! DRS->first_read_date )
1849                 DRS->first_read_date = jiffies;
1850 
1851         nr_sectors = 0;
1852         CODE2SIZE;
1853         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1854                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
1855                         (sector_t % floppy->sect) % ssize;
1856 
1857 #ifdef SANITY
1858         if ( nr_sectors > current_count_sectors + ssize -
1859             (current_count_sectors + sector_t) % ssize +
1860             sector_t % ssize){
1861                 DPRINT2("long rw: %x instead of %lx\n",
1862                         nr_sectors, current_count_sectors);
1863                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
1864                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
1865                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
1866                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
1867                        sector_t, ssize);
1868         }
1869 #endif
1870         if ( nr_sectors < 0 )
1871                 nr_sectors = 0;
1872         if ( nr_sectors < current_count_sectors )
1873                 current_count_sectors = nr_sectors;
1874 
1875         switch (interpret_errors()){
1876         case 2:
1877                 cont->redo();
1878                 return;
1879         case 1:
1880                 if (  !current_count_sectors){
1881                         cont->error();
1882                         cont->redo();
1883                         return;
1884                 }
1885                 break;
1886         case 0:
1887                 if (  !current_count_sectors){
1888                         cont->redo();
1889                         return;
1890                 }
1891                 current_type[current_drive] = floppy;
1892                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1893                         floppy->size >> 1;
1894                 break;
1895         }
1896 
1897         if (probing) {
1898                 if (DP->flags & FTD_MSG)
1899                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
1900                                 floppy->name,current_drive);
1901                 current_type[current_drive] = floppy;
1902                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1903                         floppy->size >> 1;
1904                 probing = 0;
1905         }
1906 
1907         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
1908                 /* transfer directly from buffer */
1909                 cont->done(1);
1910         } else if ( CT(COMMAND) == FD_READ){
1911                 buffer_track = raw_cmd.track;
1912                 buffer_drive = current_drive;
1913                 if ( nr_sectors + sector_t > buffer_max )
1914                         buffer_max = nr_sectors + sector_t;
1915         }
1916         cont->redo();
1917 }
1918 
1919 /* Compute maximal contiguous buffer size. */
1920 static int buffer_chain_size(void)
     /*  */
1921 {
1922         struct buffer_head *bh;
1923         int size;
1924         char *base;
1925 
1926         base = CURRENT->buffer;
1927         size = CURRENT->current_nr_sectors << 9;
1928         bh = CURRENT->bh;
1929 
1930 #ifdef SANITY
1931         if ( !bh ){
1932                 DPRINT("null request in buffer_chain_size\n");
1933                 return size >> 9;
1934         }
1935 #endif
1936 
1937         bh = bh->b_reqnext;
1938         while ( bh && bh->b_data == base + size ){
1939                 size += bh->b_size;
1940                 bh = bh->b_reqnext;
1941         }
1942         return size >> 9;
1943 }
1944 
1945 /* Compute the maximal transfer size */
1946 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
1947 {
1948         if ( max_sector > sector_t + max_size)
1949                 max_sector = sector_t + max_size;
1950 
1951         /* alignment */
1952         max_sector -= (max_sector % floppy->sect ) % ssize;
1953 
1954         /* transfer size, beginning not aligned */
1955         current_count_sectors = max_sector - sector_t ;
1956 
1957         return max_sector;
1958 }
1959 
1960 /*
1961  * Move data from/to the track buffer to/from the buffer cache.
1962  */
1963 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
1964 {
1965         int remaining; /* number of transferred 512-byte sectors */
1966         struct buffer_head *bh;
1967         char *buffer, *dma_buffer;
1968         int size;
1969 
1970         if ( max_sector > max_sector_2 )
1971                 max_sector = max_sector_2;
1972 
1973         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
1974 
1975         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
1976             buffer_max > sector_t + CURRENT->nr_sectors){
1977                 current_count_sectors = buffer_max - sector_t;
1978                 if ( current_count_sectors > CURRENT->nr_sectors )
1979                         current_count_sectors = CURRENT->nr_sectors;
1980         }
1981         remaining = current_count_sectors << 9;
1982 #ifdef SANITY
1983         if ((remaining >> 9) > CURRENT->nr_sectors  && 
1984             CT(COMMAND) == FD_WRITE ){
1985                 DPRINT("in copy buffer\n");
1986                 printk("current_count_sectors=%ld\n", current_count_sectors);
1987                 printk("remaining=%d\n", remaining >> 9);
1988                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
1989                 printk("CURRENT->current_nr_sectors=%ld\n",
1990                        CURRENT->current_nr_sectors);
1991                 printk("max_sector=%d\n", max_sector);
1992                 printk("ssize=%d\n", ssize);
1993         }
1994 #endif
1995 
1996         if ( max_sector > buffer_max )
1997                 buffer_max = max_sector;
1998 
1999         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2000 
2001         bh = CURRENT->bh;
2002         size = CURRENT->current_nr_sectors << 9;
2003         buffer = CURRENT->buffer;
2004 
2005         while ( remaining > 0){
2006                 if ( size > remaining )
2007                         size = remaining;
2008 #ifdef SANITY
2009                 if (!bh){
2010                         DPRINT("bh=null in copy buffer before copy\n");
2011                         break;
2012                 }
2013                 if (dma_buffer + size >
2014                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2015                     dma_buffer < floppy_track_buffer ){
2016                         DPRINT1("buffer overrun in copy buffer %d\n",
2017                                 (floppy_track_buffer - dma_buffer) >>9);
2018                         printk("sector_t=%d buffer_min=%d\n",
2019                                sector_t, buffer_min);
2020                         printk("current_count_sectors=%ld\n",
2021                                current_count_sectors);
2022                         if ( CT(COMMAND) == FD_READ )
2023                                 printk("read\n");
2024                         if ( CT(COMMAND) == FD_READ )
2025                                 printk("write\n");
2026                         break;
2027                 }
2028                 if ( ((int)buffer) % 512 )
2029                         DPRINT1("%p buffer not aligned\n", buffer);
2030 #endif
2031                 if ( CT(COMMAND) == FD_READ )
2032                         memcpy( buffer, dma_buffer, size);
2033                 else
2034                         memcpy( dma_buffer, buffer, size);
2035                 remaining -= size;
2036                 if ( !remaining)
2037                         break;
2038 
2039                 dma_buffer += size;
2040                 bh = bh->b_reqnext;
2041 #ifdef SANITY
2042                 if ( !bh){
2043                         DPRINT("bh=null in copy buffer after copy\n");
2044                         break;
2045                 }
2046 #endif
2047                 size = bh->b_size;
2048                 buffer = bh->b_data;
2049         }
2050 #ifdef SANITY
2051         if ( remaining ){
2052                 if ( remaining > 0 )
2053                         max_sector -= remaining >> 9;
2054                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2055         }
2056 #endif
2057 }
2058 
2059 /*
2060  * Formulate a read/write request.
2061  * this routine decides where to load the data (directly to buffer, or to
2062  * tmp floppy area), how much data to load (the size of the buffer, the whole
2063  * track, or a single sector)
2064  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2065  * allocation on the fly, it should be done here. No other part should need
2066  * modification.
2067  */
2068 
2069 static int make_raw_rw_request(void)
     /*  */
2070 {
2071         int aligned_sector_t;
2072         int max_sector, max_size, tracksize, ssize;
2073 
2074         current_drive = DRIVE(CURRENT->dev);
2075 
2076         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2077                 FD_RAW_NEED_SEEK;
2078         raw_cmd.cmd_count = NR_RW;
2079         if (CURRENT->cmd == READ){
2080                 raw_cmd.flags |= FD_RAW_READ;
2081                 COMMAND = FM_MODE(floppy,FD_READ);
2082         } else if (CURRENT->cmd == WRITE){
2083                 raw_cmd.flags |= FD_RAW_WRITE;
2084                 COMMAND = FM_MODE(floppy,FD_WRITE);
2085         } else {
2086                 DPRINT("make_raw_rw_request: unknown command\n");
2087                 return 0;
2088         }
2089 
2090         max_sector = floppy->sect * floppy->head;
2091         TRACK = CURRENT->sector / max_sector;
2092         sector_t = CURRENT->sector % max_sector;
2093         if ( floppy->track && TRACK >= floppy->track )
2094                 return 0;
2095         HEAD = sector_t / floppy->sect;
2096 
2097         if ( (DRS->flags & FD_NEED_TWADDLE) && sector_t < floppy->sect )
2098                 max_sector = floppy->sect;
2099 
2100         /* 2M disks have phantom sectors on the first track */
2101         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2102                 max_sector = 2 * floppy->sect / 3;
2103                 if (sector_t >= max_sector){
2104                         current_count_sectors =  (floppy->sect - sector_t);
2105                         if ( current_count_sectors > CURRENT->nr_sectors )
2106                                 current_count_sectors = CURRENT->nr_sectors;
2107                         return 1;
2108                 }
2109                 SIZECODE = 2;
2110         } else
2111                 SIZECODE = FD_SIZECODE(floppy);
2112         raw_cmd.rate = floppy->rate & 3;
2113         if ((floppy->rate & FD_2M) &&
2114             (TRACK || HEAD ) &&
2115             raw_cmd.rate == 2)
2116                 raw_cmd.rate = 1;
2117 
2118         if ( SIZECODE )
2119                 SIZECODE2 = 0xff;
2120         else
2121                 SIZECODE2 = 0x80;
2122         raw_cmd.track = TRACK << floppy->stretch;
2123         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
2124         GAP = floppy->gap;
2125         CODE2SIZE;
2126         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2127         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2128         tracksize = floppy->sect - floppy->sect % ssize;
2129         if ( tracksize < floppy->sect ){
2130                 SECT_PER_TRACK ++;
2131                 if (  tracksize <= sector_t % floppy->sect)
2132                         SECTOR--;
2133                 while ( tracksize <= sector_t % floppy->sect){
2134                         while( tracksize + ssize > floppy->sect ){
2135                                 SIZECODE--;
2136                                 ssize >>= 1;
2137                         }
2138                         SECTOR++; SECT_PER_TRACK ++;
2139                         tracksize += ssize;
2140                 }
2141                 max_sector = HEAD * floppy->sect + tracksize;
2142         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2143                 max_sector = floppy->sect;
2144 
2145         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2146         max_size = CURRENT->nr_sectors;
2147         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2148             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2149                 /* data already in track buffer */
2150                 if (CT(COMMAND) == FD_READ) {
2151                         copy_buffer(1, max_sector, buffer_max);
2152                         return 1;
2153                 }
2154         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2155                 if (CT(COMMAND) == FD_WRITE){
2156                         if(sector_t + CURRENT->nr_sectors > ssize &&
2157                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2158                                 max_size = ssize + ssize;
2159                         else
2160                                 max_size = ssize;
2161                 }
2162                 raw_cmd.flags &= ~FD_RAW_WRITE;
2163                 raw_cmd.flags |= FD_RAW_READ;
2164                 COMMAND = FM_MODE(floppy,FD_READ);
2165         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2166                 int direct, indirect;
2167 
2168                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2169                         sector_t;
2170 
2171                 max_size = buffer_chain_size();
2172                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2173                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2174                 /* 64 kb boundaries */
2175                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2176                      ((long) CURRENT->buffer ) / K_64 )
2177                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2178                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2179                 /*
2180                  * We try to read tracks, but if we get too many errors, we
2181                  * go back to reading just one sector at a time.
2182                  *
2183                  * This means we should be able to read a sector even if there
2184                  * are other bad sectors on this track.
2185                  */
2186                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2187                     *errors < DP->max_errors.read_track &&
2188                     /*!(DRS->flags & FD_NEED_TWADDLE) &&*/
2189                     ( ( !probing || (DP->read_track &
2190                            (1 <<DRS->probed_format))))){
2191                         max_size = CURRENT->nr_sectors;
2192                 } else {
2193                         current_addr = CURRENT->buffer;
2194                         raw_cmd.length = current_count_sectors << 9;
2195                         return 2;
2196                 }
2197         }
2198 
2199         if ( CT(COMMAND) == FD_READ )
2200                 max_size = max_sector; /* unbounded */
2201 
2202         /* claim buffer track if needed */
2203         if (buffer_track != raw_cmd.track ||  /* bad track */
2204             buffer_drive !=current_drive || /* bad drive */
2205             sector_t < buffer_min ||
2206             ((CT(COMMAND) == FD_READ ||
2207               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2208              max_sector > 2 * max_buffer_sectors + buffer_min &&
2209              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2210             /* not enough space */ ){
2211                 buffer_track = -1;
2212                 buffer_drive = current_drive;
2213                 buffer_max = buffer_min = aligned_sector_t;
2214         }
2215         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2216 
2217         if ( CT(COMMAND) == FD_WRITE ){
2218                 /* copy write buffer to track buffer.
2219                  * if we get here, we know that the write
2220                  * is either aligned or the data already in the buffer
2221                  * (buffer will be overwritten) */
2222 #ifdef SANITY
2223                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2224                         DPRINT("internal error offset !=0 on write\n");
2225 #endif
2226                 buffer_track = raw_cmd.track;
2227                 buffer_drive = current_drive;
2228                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2229         } else
2230                 transfer_size(ssize, max_sector,
2231                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2232 
2233         /* round up current_count_sectors to get dma xfer size */
2234         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2235         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2236         raw_cmd.length <<= 9;
2237 #ifdef SANITY
2238         if ((raw_cmd.length < current_count_sectors << 9) ||
2239             (current_addr != CURRENT->buffer &&
2240              CT(COMMAND) == FD_WRITE &&
2241              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2242               aligned_sector_t < buffer_min )) ||
2243             raw_cmd.length % ( 128 << SIZECODE ) ||
2244             raw_cmd.length <= 0 || current_count_sectors <= 0){
2245                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2246                         raw_cmd.length, current_count_sectors);
2247                 if ( current_addr != CURRENT->buffer )
2248                         printk("addr=%d, length=%ld\n",
2249                                (current_addr - floppy_track_buffer ) >> 9,
2250                                current_count_sectors);
2251                 printk("st=%d ast=%d mse=%d msi=%d\n",
2252                        sector_t, aligned_sector_t, max_sector, max_size);
2253                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2254                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2255                        COMMAND, SECTOR, HEAD, TRACK);
2256                 printk("buffer drive=%d\n", buffer_drive);
2257                 printk("buffer track=%d\n", buffer_track);
2258                 printk("buffer_min=%d\n", buffer_min );
2259                 printk("buffer_max=%d\n", buffer_max );
2260                 return 0;
2261         }
2262 
2263         if (current_addr != CURRENT->buffer ){
2264                 if (current_addr < floppy_track_buffer ||
2265                     current_count_sectors < 0 ||
2266                     raw_cmd.length < 0 ||
2267                     current_addr + raw_cmd.length >
2268                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2269                         DPRINT("buffer overrun in schedule dma\n");
2270                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2271                                sector_t, buffer_min,
2272                                raw_cmd.length >> 9 );
2273                         printk("current_count_sectors=%ld\n",
2274                                current_count_sectors);
2275                         if ( CT(COMMAND) == FD_READ )
2276                                 printk("read\n");
2277                         if ( CT(COMMAND) == FD_READ )
2278                                 printk("write\n");
2279                         return 0;
2280                 }
2281         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2282                    current_count_sectors > CURRENT->nr_sectors){
2283                 DPRINT("buffer overrun in direct transfer\n");
2284                 return 0;
2285         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2286                 DPRINT("more sectors than bytes\n");
2287                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2288                 printk("sectors=%ld\n", current_count_sectors);
2289         }
2290 #endif
2291         return 2;
2292 }
2293 
2294 static struct cont_t rw_cont={
2295         rw_interrupt,
2296         redo_fd_request,
2297         bad_flp_intr,
2298         request_done };
2299 
2300 static void redo_fd_request(void)
     /*  */
2301 {
2302 #define REPEAT {request_done(0); continue; }
2303         int device;
2304         int tmp;
2305 
2306         if (current_drive < N_DRIVE)
2307                 floppy_off(current_drive);
2308 
2309         if (CURRENT && CURRENT->dev < 0) return;
2310 
2311         cont = &rw_cont;        
2312         while(1){
2313                 if (!CURRENT) {
2314                         CLEAR_INTR;
2315                         unlock_fdc();
2316                         return;
2317                 }
2318                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2319                         panic(DEVICE_NAME ": request list destroyed");
2320                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2321                         panic(DEVICE_NAME ": block not locked");
2322                 
2323                 device = CURRENT->dev;
2324                 set_fdc( DRIVE(device));
2325 
2326                 timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
2327                 timer_active |= 1 << FLOPPY_TIMER;
2328                 raw_cmd.flags=0;
2329                 start_motor();
2330                 if(test_bit( DRIVE(device), &fake_change) ||
2331                    test_bit( DRIVE(device), &changed_floppies)){
2332                         DPRINT("disk absent or changed during operation\n");
2333                         REPEAT;
2334                 }
2335                 set_floppy(device);
2336                 if (!floppy) { /* Autodetection */
2337                         if (!probing){
2338                                 DRS->probed_format = 0;
2339                                 if ( next_valid_format() ){
2340                                         DPRINT("no autodetectable formats\n");
2341                                         floppy = NULL;
2342                                         REPEAT;
2343                                 }
2344                         }
2345                         probing = 1;
2346                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2347                 } else
2348                         probing = 0;
2349                 errors = & (CURRENT->errors);
2350                 tmp = make_raw_rw_request();
2351                 if ( tmp < 2 ){
2352                         request_done(tmp);
2353                         continue;
2354                 }
2355 
2356                 if ( DRS->flags & FD_NEED_TWADDLE )
2357                         twaddle();
2358                 floppy_tq.routine = (void *)(void *) floppy_start;
2359                 queue_task(&floppy_tq, &tq_timer);
2360 #ifdef DEBUGT
2361                 debugt("queue fd request");
2362 #endif
2363                 return;
2364         }
2365 #undef REPEAT
2366 }
2367 
2368 void do_fd_request(void)
     /*  */
2369 {
2370         if (fdc_busy)
2371                 /* fdc busy, this new request will be treated when the
2372                    current one is done */
2373                 return;
2374         /* fdc_busy cannot be set by an interrupt or a bh */
2375         floppy_grab_irq_and_dma();
2376         fdc_busy=1;
2377         redo_fd_request();
2378 }
2379 
2380 /*
2381  * User triggered reset
2382  * ====================
2383  */
2384 
2385 static void reset_intr(void)
     /*  */
2386 {
2387         printk("weird, reset interrupt called\n");
2388 }
2389 
2390 static struct cont_t reset_cont={
2391         reset_intr,
2392         success_and_wakeup,
2393         generic_failure,
2394         generic_done };
2395 
2396 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2397 {
2398         int result;
2399 
2400         result=0;
2401         LOCK_FDC(drive,interruptible);
2402         switch(arg){
2403         case FD_RESET_ALWAYS:
2404                 FDCS->reset=1;
2405                 break;
2406         case FD_RESET_IF_RAWCMD:
2407                 if(FDCS->rawcmd == 2 )
2408                         reset_fdc_info(1);
2409                 break;
2410         }
2411         if ( FDCS->reset ){
2412                 cont = &reset_cont;
2413                 timer_table[FLOPPY_TIMER].expires = jiffies + 5;
2414                 timer_active |= 1 << FLOPPY_TIMER;
2415                 CALL(result=wait_til_done(reset_fdc,interruptible));
2416         }
2417         if ( UDRS->track == PROVEN_ABSENT )
2418                 UDRS->track = NEED_2_RECAL;
2419         redo_fd_request();
2420         return result;
2421 }
2422 
2423 /*
2424  * Misc Ioctl's and support
2425  * ========================
2426  */
2427 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2428 {
2429         int i;
2430 
2431         i = verify_area(VERIFY_WRITE,param,size);
2432         if (i)
2433                 return i;
2434         memcpy_tofs(param,(void *) address, size);
2435         return 0;
2436 }
2437 
2438 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2439 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2440 
2441 static char *drive_name(int type, int drive )
     /*  */
2442 {
2443         struct floppy_struct *floppy;   
2444 
2445         if ( type )
2446                 floppy = floppy_type + type;
2447         else {
2448                 if ( UDP->native_format )
2449                         floppy = floppy_type + UDP->native_format;
2450                 else
2451                         return "(null)";
2452         }
2453         if ( floppy->name )
2454                 return floppy->name;
2455         else
2456                 return "(null)";
2457 }
2458 
2459 /* raw commands */
2460 static struct cont_t raw_cmd_cont={
2461         success_and_wakeup,
2462         failure_and_wakeup,
2463         generic_failure,
2464         generic_done };
2465 
2466 static int raw_cmd_ioctl(int drive, void *param)
     /*  */
2467 {
2468         int i, count, ret;
2469 
2470         if ( FDCS->rawcmd <= 1 )
2471                 FDCS->rawcmd = 1;
2472         for ( i= 0; i < N_DRIVE; i++){
2473                 if ( FDC(i) != fdc)
2474                         continue;
2475                 if ( i == drive ){
2476                         if ( drive_state[i].fd_ref > 1 ){
2477                                 FDCS->rawcmd = 2;
2478                                 break;
2479                         }
2480                 } else if ( drive_state[i].fd_ref ){
2481                         FDCS->rawcmd = 2;
2482                         break;
2483                 }
2484         }
2485 
2486         if(FDCS->reset)
2487                 return -EIO;
2488 
2489         COPYIN(raw_cmd);
2490         raw_cmd.rate &= 0x03;   
2491         count = raw_cmd.length;
2492         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2493                 if(count > max_buffer_sectors * 1024 )
2494                         return -ENOMEM;
2495                 buffer_track = -1;
2496         }
2497         if ( raw_cmd.flags & FD_RAW_WRITE ){
2498                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2499                 if (i)
2500                         return i;
2501                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2502         }
2503 
2504         current_addr = floppy_track_buffer;
2505         cont = &raw_cmd_cont;
2506         CALL(ret=wait_til_done(floppy_start,1));
2507         if( inb_p(FD_DIR) & 0x80 )
2508                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2509         else
2510                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2511         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2512                 motor_off_callback(drive);      
2513 
2514         if ( !ret && !FDCS->reset ){
2515                 raw_cmd.reply_count = inr;
2516                 for( i=0; i< raw_cmd.reply_count; i++)
2517                         raw_cmd.reply[i] = reply_buffer[i];
2518                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2519                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2520         } else
2521                 ret = -EIO;
2522         DRS->track = NO_TRACK;
2523         if ( ret )
2524                 return ret;
2525 
2526         if ( raw_cmd.flags & FD_RAW_READ ){
2527                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2528                 if (i)
2529                         return i;
2530         }
2531        
2532         return COPYOUT(raw_cmd);
2533 }
2534 
2535 static int invalidate_drive(int rdev)
     /*  */
2536 {
2537         /* invalidate the buffer track to force a reread */
2538         set_bit( DRIVE(rdev), &fake_change);
2539         redo_fd_request();
2540         check_disk_change(rdev);
2541         return 0;
2542 }
2543 
2544 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2545     unsigned long param)
2546 {
2547 #define IOCTL_MODE_BIT 8
2548 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2549 
2550         struct floppy_struct newparams;
2551         struct format_descr tmp_format_req;
2552         int i,device,drive,type,cnt;
2553         struct floppy_struct *this_floppy;
2554         char *name;
2555 
2556         device = inode->i_rdev;
2557         switch (cmd) {
2558                 RO_IOCTLS(device,param);
2559         }
2560         type = TYPE(device);
2561         drive = DRIVE(device);
2562         switch (cmd) {
2563         case FDGETDRVTYP:
2564                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2565                 if (i)
2566                         return i;
2567                 name = drive_name(type,drive);
2568                 for ( cnt=0; cnt<16; cnt++){
2569                         put_fs_byte(name[cnt],
2570                                     ((char*)param)+cnt);
2571                         if ( ! *name )
2572                                 break;
2573                 }
2574                 return 0;
2575         case FDGETMAXERRS:
2576                 return COPYOUT(UDP->max_errors);
2577         case FDGETPRM:
2578                 if (type)
2579                         this_floppy = &floppy_type[type];
2580                 else if ((this_floppy = current_type[drive]) ==
2581                          NULL)
2582                         return -ENODEV;
2583                 return COPYOUT(this_floppy[0]);
2584         case FDPOLLDRVSTAT:
2585                 check_disk_change(device);
2586                 /* fall through */
2587         case FDGETDRVSTAT:
2588                 return COPYOUT(*UDRS);
2589         case FDGETFDCSTAT:
2590                 return COPYOUT(*UFDCS);
2591         case FDGETDRVPRM:
2592                 return COPYOUT(*UDP);
2593         case FDWERRORGET:
2594                 return COPYOUT(*UDRWE);
2595         }
2596         if (!IOCTL_ALLOWED)
2597                 return -EPERM;
2598         switch (cmd) {
2599         case FDWERRORCLR:
2600                 UDRWE->write_errors = 0;
2601                 UDRWE->first_error_sector = 0;
2602                 UDRWE->first_error_generation = 0;
2603                 UDRWE->last_error_sector = 0;
2604                 UDRWE->last_error_generation = 0;
2605                 UDRWE->badness = 0;
2606                 return 0;
2607         case FDRAWCMD:
2608                 if (type)
2609                         return -EINVAL;
2610                 LOCK_FDC(drive,1);
2611                 set_floppy(device);
2612                 CALL(i = raw_cmd_ioctl(drive, (void *) param));
2613                 redo_fd_request();
2614                 return i;
2615         case FDFMTTRK:
2616                 if (UDRS->fd_ref != 1)
2617                         return -EBUSY;
2618                 if (UDRS->track == PROVEN_ABSENT)
2619                         return -ENXIO;
2620                 COPYIN(tmp_format_req);
2621                 return do_format(device, &tmp_format_req);
2622         case FDSETMAXERRS:
2623                 return COPYIN(UDP->max_errors);
2624         case FDFMTBEG:
2625                 return 0;
2626         case FDCLRPRM:
2627                 LOCK_FDC(drive,1);
2628                 current_type[drive] = NULL;
2629                 floppy_sizes[drive] = 2;
2630                 UDRS->keep_data = 0;
2631                 return invalidate_drive(device);
2632         case FDFMTEND:
2633         case FDFLUSH:
2634                 LOCK_FDC(drive,1);
2635                 return invalidate_drive(device);
2636         case FDSETPRM:
2637         case FDDEFPRM:
2638                 COPYIN(newparams);
2639                 /* sanity checking for parameters.*/
2640                 if(newparams.sect <= 0 ||
2641                    newparams.head <= 0 ||
2642                    newparams.track <= 0 ||
2643                    newparams.track >
2644                    UDP->tracks>>newparams.stretch)
2645                         return -EINVAL;
2646                 if ( type){
2647                         if ( !suser() )
2648                                 return -EPERM;
2649                         LOCK_FDC(-1,1);
2650                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2651                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2652                                     drive_state[cnt].fd_ref)
2653                                         set_bit(drive, &fake_change);
2654                         }
2655                         floppy_type[type] = newparams;
2656                         floppy_type[type].name="user format";
2657                         for (cnt = type << 2 ;
2658                              cnt < (type << 2 ) + 4 ;
2659                              cnt++)
2660                                 floppy_sizes[cnt]=
2661 #ifdef HAVE_2_CONTROLLERS
2662                                         floppy_sizes[cnt+0x80]=
2663 #endif
2664                                                 floppy_type[type].size>>1;
2665                         redo_fd_request();
2666                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2667                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2668                                     drive_state[cnt].fd_ref)
2669                                         check_disk_change(drive_state[cnt].
2670                                                           fd_device);
2671                         }
2672                         return 0;
2673                 }
2674 
2675                 LOCK_FDC(drive,1);
2676                 if ( cmd != FDDEFPRM ){
2677                         /* notice a disk change immediately, else
2678                          * we loose our settings immediately*/
2679                         raw_cmd.flags = 0;
2680                         start_motor();
2681                 }
2682                 user_params[drive] = newparams;
2683                 if (buffer_drive == drive &&
2684                     buffer_max > user_params[drive].sect)
2685                         buffer_max=user_params[drive].sect;
2686                 current_type[drive] = &user_params[drive];
2687                 floppy_sizes[drive] = user_params[drive].size >> 1;
2688                 if (cmd == FDDEFPRM)
2689                         DRS->keep_data = -1;
2690                 else
2691                         DRS->keep_data = 1;
2692                 /* invalidation. Invalidate only when needed, i.e.
2693                  * when there are already sectors in the buffer cache
2694                  * whose number will change. This is useful, because
2695                  * mtools often changes the geometry of the disk after
2696                  * looking at the boot block */
2697                 if (DRS->maxblock >
2698                     user_params[drive].sect ||
2699                     DRS->maxtrack )
2700                         invalidate_drive(device);
2701                 else
2702                         redo_fd_request();
2703                 return 0;
2704         case FDRESET:
2705                 return user_reset_fdc( drive, (int)param, 1);
2706         case FDMSGON:
2707                 UDP->flags |= FTD_MSG;
2708                 return 0;
2709         case FDMSGOFF:
2710                 UDP->flags &= ~FTD_MSG;
2711                 return 0;
2712         case FDSETEMSGTRESH:
2713                 UDP->max_errors.reporting =
2714                         (unsigned short) (param & 0x0f);
2715                 return 0;
2716         case FDTWADDLE:
2717                 LOCK_FDC(drive,1);
2718                 twaddle();
2719                 redo_fd_request();
2720         }
2721         if ( ! suser() )
2722                 return -EPERM;
2723         switch(cmd){
2724         case FDSETDRVPRM:
2725                 return COPYIN(*UDP);
2726         default:
2727                 return -EINVAL;
2728         }
2729         return 0;
2730 #undef IOCTL_ALLOWED
2731 }
2732 
2733 #define CMOS_READ(addr) ({ \
2734 outb_p(addr,0x70); \
2735 inb_p(0x71); \
2736 })
2737 
2738 static void set_base_type(int drive,int code)
     /*  */
2739 {
2740         if (code > 0 && code <= NUMBER(default_drive_params)) {
2741                 memcpy((char *) UDP,
2742                        (char *) (&default_drive_params[code].params),
2743                        sizeof( struct floppy_drive_params ));
2744                 printk("fd%d is %s", drive, default_drive_params[code].name);
2745                 return;
2746         } else if (!code)
2747                 printk("fd%d is not installed", drive);
2748         else
2749                 printk("fd%d is unknown type %d",drive,code);
2750 }
2751 
2752 static void config_types(void)
     /*  */
2753 {
2754         int drive;
2755 
2756         for (drive=0; drive<N_DRIVE ; drive++){
2757                 /* default type for unidentifiable drives */
2758                 memcpy((char *) UDP, (char *) (&default_drive_params->params),
2759                        sizeof( struct floppy_drive_params ));
2760         }
2761         printk("Floppy drive(s): ");
2762         set_base_type(0, (CMOS_READ(0x10) >> 4) & 15);
2763         if (CMOS_READ(0x10) & 15) {
2764                 printk(", ");
2765                 set_base_type(1, CMOS_READ(0x10) & 15);
2766         }
2767         printk("\n");
2768 }
2769 
2770 int floppy_is_wp( int minor)
     /*  */
2771 {
2772         check_disk_change(minor + (MAJOR_NR << 8));
2773         return ! ( drive_state[ DRIVE(minor) ].flags & FD_DISK_WRITABLE );
2774 }
2775 
2776 
2777 #define WRAPPER(op) \
2778 static int floppy_##op(struct inode * inode, struct file * filp, \
2779                      char * buf, int count) \
2780 { \
2781         check_disk_change(inode->i_rdev); \
2782         if ( drive_state[DRIVE(inode->i_rdev)].track == PROVEN_ABSENT ) \
2783                 return -ENXIO; \
2784         if ( test_bit(DRIVE(inode->i_rdev),&changed_floppies)) \
2785                 return -ENXIO; \
2786         return block_##op(inode, filp, buf, count); \
2787 }
2788 
2789 WRAPPER(read)
     /*  */
2790 WRAPPER(write)
2791 
2792 static void floppy_release(struct inode * inode, struct file * filp)
2793 {
2794         int drive;
2795         
2796         drive = DRIVE(inode->i_rdev);
2797 
2798         fsync_dev(inode->i_rdev);
2799                         
2800         if (UDRS->fd_ref < 0)
2801                 UDRS->fd_ref=0;
2802         else if (!UDRS->fd_ref--) {
2803                 DPRINT("floppy_release with fd_ref == 0");
2804                 UDRS->fd_ref = 0;
2805         }
2806         floppy_release_irq_and_dma();
2807 }
2808 
2809 /*
2810  * floppy_open check for aliasing (/dev/fd0 can be the same as
2811  * /dev/PS0 etc), and disallows simultaneous access to the same
2812  * drive with different device numbers.
2813  */
2814 #define RETERR(x) \
2815         do{floppy_release(inode,filp); \
2816            return -(x);}while(0)
2817 
2818 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2819 {
2820         int drive;
2821         int old_dev;
2822 
2823         if (!filp) {
2824                 DPRINT("Weird, open called with filp=0\n");
2825                 return -EIO;
2826         }
2827 
2828         drive = DRIVE(inode->i_rdev);
2829         if ( drive >= N_DRIVE || !( ALLOWED_DRIVE_MASK & ( 1 << drive)) )
2830                 return -ENXIO;
2831 
2832         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
2833                 return -ENXIO;
2834 
2835         if ((filp->f_mode & 3)  &&
2836             UDRS->track == PROVEN_ABSENT )
2837                 return -ENXIO;
2838 
2839         old_dev = UDRS->fd_device;
2840         if (UDRS->fd_ref && old_dev != inode->i_rdev)
2841                 return -EBUSY;
2842 
2843         if(UDRS->fd_ref == -1 ||
2844            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
2845                 return -EBUSY;
2846 
2847         if (floppy_grab_irq_and_dma())
2848                 return -EBUSY;
2849 
2850         if(filp->f_flags & O_EXCL)
2851                 UDRS->fd_ref = -1;
2852         else
2853                 UDRS->fd_ref++;
2854 
2855         UDRS->fd_device = inode->i_rdev;
2856 
2857         if (old_dev && old_dev != inode->i_rdev) {
2858                 if (buffer_drive == drive)
2859                         buffer_track = -1;
2860                 invalidate_buffers(old_dev);
2861         }
2862 
2863         /* Allow ioctls if we have write-permissions even if read-only open */
2864         if ((filp->f_mode & 2) || permission(inode,2))
2865                 filp->f_mode |= IOCTL_MODE_BIT;
2866 
2867         if (UFDCS->rawcmd == 1)
2868                UFDCS->rawcmd = 2;
2869 
2870         if (filp->f_flags & O_NDELAY)
2871                 return 0;
2872 
2873         if (filp->f_mode && UDRS->track == PROVEN_ABSENT )
2874                 RETERR(ENXIO);
2875 
2876         if (user_reset_fdc(drive, FD_RESET_IF_NEEDED,0))
2877                 RETERR(EIO);
2878 
2879         if (filp->f_mode & 3) {
2880                 UDRS->last_checked = 0;
2881                 check_disk_change(inode->i_rdev);
2882                 if (test_bit(drive,&changed_floppies))
2883                         RETERR(ENXIO);
2884         }
2885         
2886         if (filp->f_mode && UDRS->track == PROVEN_ABSENT )
2887                 RETERR(ENXIO);
2888 
2889         if ((filp->f_mode & 2) && !(UDRS->flags & FD_DISK_WRITABLE))
2890                 RETERR(EROFS);
2891         return 0;
2892 #undef RETERR
2893 }
2894 
2895 /*
2896  * Check if the disk has been changed or if a change has been faked.
2897  */
2898 static int check_floppy_change(dev_t dev)
     /*  */
2899 {
2900         int drive = DRIVE( dev );
2901 
2902         if (MAJOR(dev) != MAJOR_NR) {
2903                 DPRINT("floppy_changed: not a floppy\n");
2904                 return 0;
2905         }
2906 
2907         if(test_bit(drive, &changed_floppies))
2908                 return 1;
2909 
2910         if(UDRS->last_checked + UDP->checkfreq < jiffies){
2911                 lock_fdc(drive,0);
2912                 start_motor();
2913                 redo_fd_request();
2914         }
2915                 
2916         if(test_bit(drive, &changed_floppies))
2917                 return 1;
2918         if(test_bit(drive, &fake_change))
2919                 return 1;
2920         return 0;
2921 }
2922 
2923 static struct cont_t poll_cont={
2924         success_and_wakeup,
2925         floppy_ready,
2926         generic_failure,
2927         generic_done };
2928 
2929 
2930 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
2931  * the bootblock (block 0). "Autodetection" is also needed to check wether
2932  * there is a disk in the drive at all... Thus we also do it for fixed
2933  * geometry formats */
2934 static int floppy_revalidate(dev_t dev)
     /*  */
2935 {
2936         struct buffer_head * bh;
2937         int drive=DRIVE(dev);
2938         int cf;
2939 
2940         cf = test_bit(drive, &changed_floppies);
2941         if(cf || test_bit(drive, &fake_change)){
2942                 lock_fdc(drive,0);
2943                 cf = test_bit(drive, &changed_floppies);
2944                 if(! (cf || test_bit(drive, &fake_change))){
2945                         redo_fd_request(); /* already done by another thread */
2946                         return 0;
2947                 }
2948                 UDRS->maxblock = 0;
2949                 UDRS->maxtrack = 0;
2950                 if ( buffer_drive == drive)
2951                         buffer_track = -1;
2952                 clear_bit(drive, &fake_change);
2953                 clear_bit(drive, &changed_floppies);
2954                 if(cf){
2955                         UDRS->generation++;
2956                         if(!current_type[drive] && !TYPE(dev)){
2957                                 /* auto-sensing */
2958                                 if (!(bh = getblk(dev,0,1024))){
2959                                         redo_fd_request();
2960                                         return 1;
2961                                 }
2962                                 if ( bh && ! bh->b_uptodate)
2963                                         ll_rw_block(READ, 1, &bh);
2964                                 redo_fd_request();
2965                                 wait_on_buffer(bh);
2966                                 brelse(bh);
2967                                 return 0;
2968                         } else {
2969                                 /* no auto-sense, just clear dcl */
2970                                 raw_cmd.flags=FD_RAW_NEED_SEEK|FD_RAW_NEED_DISK;
2971                                 raw_cmd.track=0;
2972                                 raw_cmd.cmd_count=0;
2973                                 cont = &poll_cont;
2974                                 wait_til_done(floppy_ready,0);
2975                         }
2976                 }
2977                 redo_fd_request();
2978         }
2979         return 0;
2980 }
2981 
2982 static struct file_operations floppy_fops = {
2983         NULL,                   /* lseek - default */
2984         floppy_read,            /* read - general block-dev read */
2985         floppy_write,           /* write - general block-dev write */
2986         NULL,                   /* readdir - bad */
2987         NULL,                   /* select */
2988         fd_ioctl,               /* ioctl */
2989         NULL,                   /* mmap */
2990         floppy_open,            /* open */
2991         floppy_release,         /* release */
2992         block_fsync,            /* fsync */
2993         NULL,                   /* fasync */
2994         check_floppy_change,    /* media_change */
2995         floppy_revalidate,      /* revalidate */
2996 };
2997 
2998 /*
2999  * Floppy Driver initialisation
3000  * =============================
3001  */
3002 
3003 /* Determine the floppy disk controller type */
3004 /* This routine was written by David C. Niemi */
3005 static char get_fdc_version(void)
     /*  */
3006 {
3007         int r;
3008 
3009         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3010         if ( FDCS->reset )
3011                 return FDC_NONE;
3012         if ( (r = result()) <= 0x00)
3013                 return FDC_NONE;        /* No FDC present ??? */
3014         if ((r==1) && (reply_buffer[0] == 0x80)){
3015                 printk("FDC %d is a 8272A\n",fdc);
3016                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3017         }
3018         if (r != 10) {
3019                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3020                 return FDC_UNKNOWN;
3021         }
3022         output_byte(FD_VERSION);
3023         r = result();
3024         if ((r == 1) && (reply_buffer[0] == 0x80)){
3025                 printk("FDC %d is a 82072\n",fdc);
3026                 return FDC_82072;               /* 82072 doesn't know VERSION */
3027         }
3028         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3029                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3030                 return FDC_UNKNOWN;
3031         }
3032         output_byte(FD_UNLOCK);
3033         r = result();
3034         if ((r == 1) && (reply_buffer[0] == 0x80)){
3035                 printk("FDC %d is a pre-1991 82077\n", fdc);
3036                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3037         }
3038         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3039                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3040                 return FDC_UNKNOWN;
3041         }
3042         printk("FDC %d is a post-1991 82077\n",fdc);
3043         return FDC_82077;       /* Revised 82077AA passes all the tests */
3044 } /* fdc_init */
3045 
3046 void floppy_init(void)
     /*  */
3047 {
3048         int i;
3049 
3050         sti();
3051 
3052         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3053                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3054                 return;
3055         }
3056 
3057         for(i=0; i<256; i++)
3058                 if ( TYPE(i))
3059                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3060                 else
3061                         floppy_sizes[i] = MAX_DISK_SIZE;
3062 
3063         blk_size[MAJOR_NR] = floppy_sizes;
3064         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3065         timer_table[FLOPPY_TIMER].fn = floppy_shutdown;
3066         timer_active &= ~(1 << FLOPPY_TIMER);
3067         config_types();
3068 
3069         fdc_state[0].address = 0x3f0;
3070 #if N_FDC > 1
3071         fdc_state[1].address = 0x370;
3072 #endif
3073         for (i = 0 ; i < N_FDC ; i++) {
3074                 fdc = i;
3075                 FDCS->dtr = -1;
3076                 FDCS->dor = 0;
3077                 FDCS->reset = 0;
3078                 FDCS->version = FDC_NONE;
3079                 set_dor(fdc, ~0, 0xc );
3080         }
3081 
3082         /* initialise drive state */
3083         for (i = 0; i < N_DRIVE ; i++) {
3084                 current_drive = i;
3085                 DRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE;
3086                 DRS->generation = 0;
3087                 DRS->keep_data = 0;
3088                 DRS->fd_ref = 0;
3089                 DRS->fd_device = 0;
3090                 DRWE->write_errors = 0;
3091                 DRWE->first_error_sector = 0;
3092                 DRWE->first_error_generation = 0;
3093                 DRWE->last_error_sector = 0;
3094                 DRWE->last_error_generation = 0;
3095                 DRWE->badness = 0;
3096         }
3097 
3098         floppy_grab_irq_and_dma();
3099         for (i = 0 ; i < N_FDC ; i++) {
3100                 fdc = i;
3101                 FDCS->rawcmd = 2;
3102                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0))
3103                         continue;
3104                 /* Try to determine the floppy controller type */
3105                 FDCS->version = get_fdc_version();
3106                 if (FDCS->version == FDC_NONE)
3107                         continue;
3108 
3109                 /* Not all FDCs seem to be able to handle the version command
3110                  * properly, so force a reset for the standard FDC clones,
3111                  * to avoid interrupt garbage.
3112                  */
3113                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3114                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3115         }
3116         fdc=0;
3117         current_drive = 0;
3118         floppy_release_irq_and_dma();
3119         initialising=0;
3120 }
3121 
3122 static int floppy_grab_irq_and_dma(void)
     /*  */
3123 {
3124         cli();
3125         if (usage_count++){
3126                 sti();
3127                 return 0;
3128         }
3129         sti();
3130         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
3131                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3132                         FLOPPY_IRQ);
3133                 return -1;
3134         }
3135         if (request_dma(FLOPPY_DMA,"floppy")) {
3136                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3137                         FLOPPY_DMA);
3138                 free_irq(FLOPPY_IRQ);
3139                 return -1;
3140         }
3141         enable_irq(FLOPPY_IRQ);
3142         return 0;
3143 }
3144 
3145 static void floppy_release_irq_and_dma(void)
     /*  */
3146 {
3147         cli();
3148         if (--usage_count){
3149                 sti();
3150                 return;
3151         }
3152         sti();
3153         disable_dma(FLOPPY_DMA);
3154         free_dma(FLOPPY_DMA);
3155         disable_irq(FLOPPY_IRQ);
3156         free_irq(FLOPPY_IRQ);
3157 #ifdef HAVE_2_CONTROLLERS
3158         /* switch on first controller.
3159          * This saves us trouble on the next reboot. */
3160         set_dor(0, ~0, 8 );
3161         set_dor(1, ~8, 0 );
3162 #endif
3163 }