root/drivers/block/floppy.c

/* */

DEFINITIONS

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

   1 /*
   2  *  linux/kernel/floppy.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1993, 1994  Alain Knaff
   6  */
   7 /*
   8  * 02.12.91 - Changed to static variables to indicate need for reset
   9  * and recalibrate. This makes some things easier (output_byte reset
  10  * checking etc), and means less interrupt jumping in case of errors,
  11  * so the code is hopefully easier to understand.
  12  */
  13 
  14 /*
  15  * This file is certainly a mess. I've tried my best to get it working,
  16  * but I don't like programming floppies, and I have only one anyway.
  17  * Urgel. I should check for more errors, and do more graceful error
  18  * recovery. Seems there are problems with several drives. I've tried to
  19  * correct them. No promises.
  20  */
  21 
  22 /*
  23  * As with hd.c, all routines within this file can (and will) be called
  24  * by interrupts, so extreme caution is needed. A hardware interrupt
  25  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  26  * call "floppy-on" directly, but have to set a special timer interrupt
  27  * etc.
  28  */
  29 
  30 /*
  31  * 28.02.92 - made track-buffering routines, based on the routines written
  32  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  33  */
  34 
  35 /*
  36  * Automatic floppy-detection and formatting written by Werner Almesberger
  37  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  38  * the floppy-change signal detection.
  39  */
  40 
  41 /*
  42  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  43  * FDC data overrun bug, added some preliminary stuff for vertical
  44  * recording support.
  45  *
  46  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  47  *
  48  * TODO: Errors are still not counted properly.
  49  */
  50 
  51 /* 1992/9/20
  52  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  53  * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
  54  * Christoph H. Hochst\"atter.
  55  * I have fixed the shift values to the ones I always use. Maybe a new
  56  * ioctl() should be created to be able to modify them.
  57  * There is a bug in the driver that makes it impossible to format a
  58  * floppy as the first thing after bootup.
  59  */
  60 
  61 /*
  62  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  63  * this helped the floppy driver as well. Much cleaner, and still seems to
  64  * work.
  65  */
  66 
  67 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  68  * minor modifications to allow 2.88 floppies to be run.
  69  */
  70 
  71 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
  72  * disk types.
  73  */
  74 
  75 /*
  76  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
  77  * format bug fixes, but unfortunately some new bugs too...
  78  */
  79 
  80 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
  81  * errors to allow safe writing by specialized programs.
  82  */
  83 
  84 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
  85  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
  86  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
  87  * drives are "upside-down").
  88  */
  89 
  90 #define CONFIG_FLOPPY_SANITY
  91 #undef  CONFIG_FLOPPY_SILENT_DCL_CLEAR
  92 
  93 #define REALLY_SLOW_IO
  94 
  95 #define DEBUGT 2
  96 #define DCL_DEBUG /* debug disk change line */
  97 
  98 #include <linux/config.h>
  99 
 100 /* do print messages for unexpected interrupts */
 101 static int print_unex=1;
 102 
 103 #ifdef MODULE
 104 #define FD_MODULE
 105 
 106 #include <linux/module.h>
 107 /*
 108  * NB. we must include the kernel identification string to install the module.
 109  */
 110 #include <linux/version.h>
 111 char kernel_version[] = UTS_RELEASE;
 112 
 113 int FLOPPY_IRQ=6;
 114 int FLOPPY_DMA=2;
 115 int ALLOWED_DRIVE_MASK = 0x33;
 116 int FDC1 = 0x3f0;
 117 int FDC2 = -1;
 118 
 119 #endif
 120 
 121 #ifndef FD_MODULE
 122 /* the following is the mask of allowed drives. By default units 2 and
 123  * 3 of both floppy controllers are disabled, because switching on the
 124  * motor of these drives causes system hangs on some PCI computers. drive
 125  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 126  * a drive is allowed. */
 127 static int ALLOWED_DRIVE_MASK=0x33;
 128 
 129 #define FLOPPY_IRQ 6
 130 #define FLOPPY_DMA 2
 131 #define FDC1 0x3f0
 132 static int FDC2=-1;
 133 #endif
 134 
 135 #define MODULE_AWARE_DRIVER
 136 
 137 #include <linux/sched.h>
 138 #include <linux/fs.h>
 139 #include <linux/kernel.h>
 140 #include <linux/timer.h>
 141 #include <linux/tqueue.h>
 142 #define FDPATCHES
 143 #include <linux/fdreg.h>
 144 
 145 /* ============================================ *
 146  * old fd.h                                     *
 147  * =========================================== */
 148 
 149 #define OLDFDCLRPRM 0 /* clear user-defined parameters */
 150 #define OLDFDSETPRM 1 /* set user-defined parameters for current media */
 151 #define OLDFDSETMEDIAPRM 1
 152 #define OLDFDDEFPRM 2 /* set user-defined parameters until explicitly cleared */
 153 #define OLDFDDEFMEDIAPRM 2
 154 #define OLDFDGETPRM 3 /* get disk parameters */
 155 #define OLDFDGETMEDIAPRM 3
 156 #define OLDFDMSGON  4 /* issue kernel messages on media type change */
 157 #define OLDFDMSGOFF 5 /* don't issue kernel messages on media type change */
 158 #define OLDFDFMTBEG 6 /* begin formatting a disk */
 159 #define OLDFDFMTTRK 7 /* format the specified track */
 160 #define OLDFDFMTEND 8 /* end formatting a disk */
 161 #define OLDFDSETEMSGTRESH       10      /* set fdc error reporting threshold */
 162 #define OLDFDFLUSH  11 /* flush buffers for media; either for verifying media, or for
 163                        handling a media change without closing the file
 164                        descriptor */
 165 #define OLDFDSETMAXERRS 12 /* set abortion and read_track threshold */
 166 #define OLDFDGETMAXERRS 14 /* get abortion and read_track threshold */
 167 #define OLDFDGETDRVTYP 16          /* get drive type: 5 1/4 or 3 1/2 */
 168 
 169 #define OLDFDSETDRVPRM 20 /* set drive parameters */
 170 #define OLDFDGETDRVPRM 21 /* get drive parameters */
 171 #define OLDFDGETDRVSTAT 22 /* get drive state */
 172 #define OLDFDPOLLDRVSTAT 23 /* get drive state */
 173 #define OLDFDRESET 24 /* reset FDC */
 174 
 175 #define OLDFD_RESET_IF_NEEDED 0
 176 #define OLDFD_RESET_IF_RAWCMD 1
 177 #define OLDFD_RESET_ALWAYS 2
 178 
 179 #define OLDFDGETFDCSTAT 25 /* get fdc state */
 180 #define OLDFDWERRORCLR  27 /* clear write error and badness information */
 181 #define OLDFDWERRORGET  28 /* get write error and badness information */
 182 
 183 #define OLDFDRAWCMD 30 /* send a raw command to the fdc */
 184 
 185 #define OLDFDTWADDLE 40 /* flicker motor-on bit before reading a sector */
 186 
 187 struct old_floppy_raw_cmd {
 188   void *data;
 189   long length;
 190 
 191   unsigned char rate;
 192   unsigned char flags;
 193   unsigned char cmd_count;
 194   unsigned char cmd[9];
 195   unsigned char reply_count;
 196   unsigned char reply[7];
 197   int track;
 198 };
 199 
 200 struct old_floppy_fdc_state {   
 201         int spec1; /* spec1 value last used */
 202         int spec2; /* spec2 value last used */
 203         int dtr;
 204         unsigned char version;  /* FDC version code */
 205         unsigned char dor;
 206         int address; /* io address */
 207         unsigned int rawcmd:2;
 208         unsigned int reset:1;
 209         unsigned int need_configure:1;
 210         unsigned int perp_mode:2;
 211         unsigned int has_fifo:1;
 212 };
 213 
 214 
 215 #include <linux/fd.h>
 216 #include <linux/errno.h>
 217 #include <linux/malloc.h>
 218 #include <linux/mm.h>
 219 #include <linux/string.h>
 220 #include <linux/fcntl.h>
 221 #include <linux/delay.h>
 222 #include <linux/mc146818rtc.h> /* CMOS defines */
 223 #include <linux/ioport.h>
 224 
 225 #include <asm/dma.h>
 226 #include <asm/irq.h>
 227 #include <asm/system.h>
 228 #include <asm/io.h>
 229 #include <asm/segment.h>
 230 
 231 #define MAJOR_NR FLOPPY_MAJOR
 232 #include "blk.h"
 233 
 234 
 235 /* Dma Memory related stuff */
 236 
 237 /* Pure 2^n version of get_order */
 238 static inline int __get_order (int size)
     /*  */
 239 {
 240         int order;
 241 
 242 #ifdef  _ASM_IO_H2
 243         __asm__ __volatile__("bsr %1,%0"
 244                              : "=r" (order)
 245                              : "r" (size / PAGE_SIZE) );
 246 #else
 247         for (order = 0; order < NR_MEM_LISTS; ++order)
 248                 if (size <= (PAGE_SIZE << order))
 249                         return order;
 250 #endif
 251         return NR_MEM_LISTS;
 252 }
 253 
 254 static unsigned long dma_mem_alloc(int size)
     /*  */
 255 {
 256         int order = __get_order(size);
 257 
 258         if (order >= NR_MEM_LISTS)
 259                 return(0);
 260         return __get_dma_pages(GFP_KERNEL,order);
 261 }
 262 
 263 /* End dma memory related stuff */
 264 
 265 static unsigned int fake_change = 0;
 266 static int initialising=1;
 267 
 268 /*
 269  * Again, the CMOS information doesn't work on the alpha..
 270  */
 271 #ifdef __alpha__
 272 #define FLOPPY0_TYPE 6
 273 #define FLOPPY1_TYPE 0
 274 #else
 275 #define FLOPPY0_TYPE    ((CMOS_READ(0x10) >> 4) & 15)
 276 #define FLOPPY1_TYPE    (CMOS_READ(0x10) & 15)
 277 #endif
 278 
 279 #define N_FDC 2
 280 #define N_DRIVE 8
 281 
 282 static inline int TYPE(kdev_t x) {
     /*  */
 283         return  (MINOR(x)>>2) & 0x1f;
 284 }
 285 static inline int DRIVE(kdev_t x) {
     /*  */
 286         return (MINOR(x)&0x03) | ((MINOR(x)&0x80 ) >> 5);
 287 }
 288 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 289 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 290 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 291 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 292                                 /* reverse mapping from unit and fdc to drive */
 293 #define DP (&drive_params[current_drive])
 294 #define DRS (&drive_state[current_drive])
 295 #define DRWE (&write_errors[current_drive])
 296 #define FDCS (&fdc_state[fdc])
 297 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 298 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 299 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 300 
 301 #define UDP (&drive_params[drive])
 302 #define UDRS (&drive_state[drive])
 303 #define UDRWE (&write_errors[drive])
 304 #define UFDCS (&fdc_state[FDC(drive)])
 305 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 306 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 307 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 308 
 309 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 310 
 311 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 312 
 313 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 314 
 315 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 316 
 317 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 318 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 319 
 320 /* read/write */
 321 #define COMMAND raw_cmd->cmd[0]
 322 #define DR_SELECT raw_cmd->cmd[1]
 323 #define TRACK raw_cmd->cmd[2]
 324 #define HEAD raw_cmd->cmd[3]
 325 #define SECTOR raw_cmd->cmd[4]
 326 #define SIZECODE raw_cmd->cmd[5]
 327 #define SECT_PER_TRACK raw_cmd->cmd[6]
 328 #define GAP raw_cmd->cmd[7]
 329 #define SIZECODE2 raw_cmd->cmd[8]
 330 #define NR_RW 9
 331 
 332 /* format */
 333 #define F_SIZECODE raw_cmd->cmd[2]
 334 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 335 #define F_GAP raw_cmd->cmd[4]
 336 #define F_FILL raw_cmd->cmd[5]
 337 #define NR_F 6
 338 
 339 /*
 340  * Maximum disk size (in kilobytes). This default is used whenever the
 341  * current disk size is unknown.
 342  * [Now it is rather a minimum]
 343  */
 344 #define MAX_DISK_SIZE 2 /* 3984*/
 345 
 346 
 347 #define K_64    0x10000         /* 64KB */
 348 
 349 /*
 350  * The DMA channel used by the floppy controller cannot access data at
 351  * addresses >= 16MB
 352  *
 353  * Went back to the 1MB limit, as some people had problems with the floppy
 354  * driver otherwise. It doesn't matter much for performance anyway, as most
 355  * floppy accesses go through the track buffer.
 356  */
 357 #ifdef __alpha__
 358 # define CROSS_64KB(a,s)        (0)
 359 #else
 360 # define CROSS_64KB(a,s) ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)
 361 #endif
 362 
 363 /*
 364  * globals used by 'result()'
 365  */
 366 #define MAX_REPLIES 10
 367 static unsigned char reply_buffer[MAX_REPLIES];
 368 static int inr; /* size of reply buffer, when called from interrupt */
 369 #define ST0 (reply_buffer[0])
 370 #define ST1 (reply_buffer[1])
 371 #define ST2 (reply_buffer[2])
 372 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 373 #define R_TRACK (reply_buffer[3])
 374 #define R_HEAD (reply_buffer[4])
 375 #define R_SECTOR (reply_buffer[5])
 376 #define R_SIZECODE (reply_buffer[6])
 377 
 378 #define SEL_DLY (2*HZ/100)
 379 
 380 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 381 /*
 382  * this struct defines the different floppy drive types.
 383  */
 384 static struct {
 385         struct floppy_drive_params params;
 386         const char *name; /* name printed while booting */
 387 } default_drive_params[]= {
 388 /* NOTE: the time values in jiffies should be in msec!
 389  CMOS drive type
 390   |     Maximum data rate supported by drive type
 391   |     |   Head load time, msec
 392   |     |   |   Head unload time, msec (not used)
 393   |     |   |   |     Step rate interval, usec
 394   |     |   |   |     |       Time needed for spinup time (jiffies)
 395   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 396   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 397   |     |   |   |     |       |      |   |     Select delay
 398   |     |   |   |     |       |      |   |     |     RPS
 399   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 400   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 401   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 402   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 403 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 404       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 405 
 406 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 407       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 408 
 409 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 410       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 411 
 412 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 413       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 414 
 415 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 416       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 417 
 418 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 419       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 420 
 421 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 422       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 423 /*    |  --autodetected formats---    |      |      |
 424  *    read_track                      |      |    Name printed when booting
 425  *                                    |     Native format
 426  *                  Frequency of disk change checks */
 427 };
 428 
 429 static struct floppy_drive_params drive_params[N_DRIVE];
 430 static struct floppy_drive_struct drive_state[N_DRIVE];
 431 static struct floppy_write_errors write_errors[N_DRIVE];
 432 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 433 
 434 /*
 435  * This struct defines the different floppy types.
 436  *
 437  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 438  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 439  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 440  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 441  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 442  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 443  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 444  * 'stretch' should probably be renamed to something more general, like
 445  * 'options'.  Other parameters should be self-explanatory (see also
 446  * setfdprm(8)).
 447  */
 448 static struct floppy_struct floppy_type[32] = {
 449         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 450         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 451         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 452         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 453         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 454         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 455         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 456         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 457         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 458         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 459 
 460         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 461         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 462         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 463         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 464         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 465         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 466         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 467         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 468         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 469         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 470 
 471         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 472         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 473         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 474         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 475         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 476         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 477         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 478         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 479         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 480 
 481         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 482         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 483         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 484 };
 485 
 486 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 487 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 488 
 489 /* Auto-detection: Disk type used until the next media change occurs. */
 490 struct floppy_struct *current_type[N_DRIVE] = {
 491         NULL, NULL, NULL, NULL,
 492         NULL, NULL, NULL, NULL
 493 };
 494 
 495 /*
 496  * User-provided type information. current_type points to
 497  * the respective entry of this array.
 498  */
 499 struct floppy_struct user_params[N_DRIVE];
 500 
 501 static int floppy_sizes[256];
 502 static int floppy_blocksizes[256] = { 0, };
 503 
 504 /*
 505  * The driver is trying to determine the correct media format
 506  * while probing is set. rw_interrupt() clears it after a
 507  * successful access.
 508  */
 509 static int probing = 0;
 510 
 511 /* Synchronization of FDC access. */
 512 #define FD_COMMAND_DETECT -2
 513 #define FD_COMMAND_NONE -1
 514 #define FD_COMMAND_ERROR 2
 515 #define FD_COMMAND_OKAY 3
 516 
 517 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 518 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 519 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 520 #define CALL(x) if( (x) == -EINTR) return -EINTR
 521 #define ECALL(x) if((ret = (x))) return ret;
 522 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 523 #define WAIT(x) _WAIT((x),interruptible)
 524 #define IWAIT(x) _WAIT((x),1)
 525 
 526 /* Errors during formatting are counted here. */
 527 static int format_errors;
 528 
 529 /* Format request descriptor. */
 530 static struct format_descr format_req;
 531 
 532 /*
 533  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 534  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 535  * H is head unload time (1=16ms, 2=32ms, etc)
 536  */
 537 
 538 /*
 539  * Track buffer
 540  * Because these are written to by the DMA controller, they must
 541  * not contain a 64k byte boundary crossing, or data will be
 542  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 543  * Note that you must not change the sizes below without updating head.S.
 544  */
 545 char *floppy_track_buffer=0;
 546 int max_buffer_sectors=0;
 547 
 548 int *errors;
 549 typedef void (*done_f)(int);
 550 struct cont_t {
 551         void (*interrupt)(void); /* this is called after the interrupt of the
 552                                   * main command */
 553         void (*redo)(void); /* this is called to retry the operation */
 554         void (*error)(void); /* this is called to tally an error */
 555         done_f done; /* this is called to say if the operation has 
 556                       * succeeded/failed */
 557 } *cont=NULL;
 558 
 559 static void floppy_ready(void);
 560 static void floppy_start(void);
 561 static void process_fd_request(void);
 562 static void recalibrate_floppy(void);
 563 static void floppy_shutdown(void);
 564 
 565 static int floppy_grab_irq_and_dma(void);
 566 static void floppy_release_irq_and_dma(void);
 567 
 568 /*
 569  * The "reset" variable should be tested whenever an interrupt is scheduled,
 570  * after the commands have been sent. This is to ensure that the driver doesn't
 571  * get wedged when the interrupt doesn't come because of a failed command.
 572  * reset doesn't need to be tested before sending commands, because
 573  * output_byte is automatically disabled when reset is set.
 574  */
 575 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 576 static void reset_fdc(void);
 577 
 578 /*
 579  * These are global variables, as that's the easiest way to give
 580  * information to interrupts. They are the data used for the current
 581  * request.
 582  */
 583 #define NO_TRACK -1
 584 #define NEED_1_RECAL -2
 585 #define NEED_2_RECAL -3
 586 
 587 /* */
 588 static int usage_count = 0;
 589 
 590 
 591 /* buffer related variables */
 592 static int buffer_track = -1;
 593 static int buffer_drive = -1;
 594 static int buffer_min = -1;
 595 static int buffer_max = -1;
 596 
 597 /* fdc related variables, should end up in a struct */
 598 static struct floppy_fdc_state fdc_state[N_FDC];
 599 static int fdc; /* current fdc */
 600 
 601 static struct floppy_struct * floppy = floppy_type;
 602 static unsigned char current_drive = 0;
 603 static long current_count_sectors = 0;
 604 static unsigned char sector_t; /* sector in track */
 605 
 606 #ifdef DEBUGT
 607 long unsigned debugtimer;
 608 #endif
 609 
 610 /*
 611  * Debugging
 612  * =========
 613  */
 614 static inline void set_debugt(void)
     /*  */
 615 {
 616 #ifdef DEBUGT
 617         debugtimer = jiffies;
 618 #endif
 619 }
 620 
 621 static inline void debugt(const char *message)
     /*  */
 622 {
 623 #ifdef DEBUGT
 624         if ( DP->flags & DEBUGT )
 625                 printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 626 #endif
 627 }
 628 
 629 typedef void (*timeout_fn)(unsigned long);
 630 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 631                                        (timeout_fn) floppy_shutdown };
 632 
 633 static const char *timeout_message;
 634 
 635 #ifdef CONFIG_FLOPPY_SANITY
 636 static void is_alive(const char *message)
     /*  */
 637 {
 638         /* this routine checks whether the floppy driver is "alive" */
 639         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 640                 DPRINT1("timeout handler died: %s\n",message);
 641         }
 642 }
 643 #endif
 644 
 645 #ifdef CONFIG_FLOPPY_SANITY
 646 
 647 #define OLOGSIZE 20
 648 
 649 void (*lasthandler)(void) = NULL;
 650 int interruptjiffies=0;
 651 int resultjiffies=0;
 652 int resultsize=0;
 653 int lastredo=0;
 654 
 655 static struct output_log {
 656         unsigned char data;
 657         unsigned char status;
 658         unsigned long jiffies;
 659 } output_log[OLOGSIZE];
 660 
 661 static int output_log_pos=0;
 662 #endif
 663 
 664 #define CURRENTD -1
 665 #define MAXTIMEOUT -2
 666 
 667 
 668 
 669 static void reschedule_timeout(int drive, const char *message, int marg)
     /*  */
 670 {
 671         if (drive == CURRENTD )
 672                 drive = current_drive;
 673         del_timer(&fd_timeout);
 674         if (drive < 0 || drive > N_DRIVE) {
 675                 fd_timeout.expires = jiffies + 20*HZ;
 676                 drive=0;
 677         } else
 678                 fd_timeout.expires = jiffies + UDP->timeout;
 679         add_timer(&fd_timeout);
 680         if (UDP->flags & FD_DEBUG){
 681                 DPRINT("reschedule timeout ");
 682                 printk(message, marg);
 683                 printk("\n");
 684         }
 685         timeout_message = message;
 686 }
 687 
 688 /*
 689  * Bottom half floppy driver.
 690  * ==========================
 691  *
 692  * This part of the file contains the code talking directly to the hardware,
 693  * and also the main service loop (seek-configure-spinup-command)
 694  */
 695 
 696 /*
 697  * disk change.
 698  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 699  * and the last_checked date.
 700  *
 701  * last_checked is the date of the last check which showed 'no disk change'
 702  * FD_DISK_CHANGE is set under two conditions:
 703  * 1. The floppy has been changed after some i/o to that floppy already
 704  *    took place.
 705  * 2. No floppy disk is in the drive. This is done in order to ensure that
 706  *    requests are quickly flushed in case there is no disk in the drive. It
 707  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 708  *    the drive.
 709  *
 710  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 711  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 712  *  each seek. If a disk is present, the disk change line should also be
 713  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 714  *  change line is set, this means either that no disk is in the drive, or
 715  *  that it has been removed since the last seek.
 716  *
 717  * This means that we really have a third possibility too:
 718  *  The floppy has been changed after the last seek.
 719  */
 720 
 721 static int disk_change(int drive)
     /*  */
 722 {
 723         int fdc=FDC(drive);
 724 #ifdef CONFIG_FLOPPY_SANITY
 725         if(jiffies < UDP->select_delay + UDRS->select_date)
 726                 DPRINT("WARNING disk change called early\n");
 727         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 728            (FDCS->dor & 3) != UNIT(drive) ||
 729            fdc != FDC(drive)){
 730                 DPRINT("probing disk change on unselected drive\n");
 731                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 732                         FDCS->dor);
 733         }
 734 #endif
 735 
 736 #ifdef DCL_DEBUG
 737         if (UDP->flags & FD_DEBUG){
 738                 DPRINT1("checking disk change line for drive %d\n",drive);
 739                 DPRINT1("jiffies=%ld\n", jiffies);
 740                 DPRINT1("disk change line=%x\n",inb_p(FD_DIR)&0x80);
 741                 DPRINT1("flags=%x\n",UDRS->flags);
 742         }
 743 #endif
 744         if (UDP->flags & FD_BROKEN_DCL)
 745                 return UTESTF(FD_DISK_CHANGED);
 746         if( (inb_p(FD_DIR) ^ UDP->flags) & 0x80){
 747                 USETF(FD_VERIFY); /* verify write protection */
 748                 if(UDRS->maxblock){
 749                         /* mark it changed */
 750                         USETF(FD_DISK_CHANGED);
 751 
 752                         /* invalidate its geometry */
 753                         if (UDRS->keep_data >= 0) {
 754                                 if ((UDP->flags & FTD_MSG) &&
 755                                     current_type[drive] != NULL)
 756                                         DPRINT("Disk type is undefined after "
 757                                                "disk change\n");
 758                                 current_type[drive] = NULL;
 759                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 760                         }
 761                 }
 762                 /*USETF(FD_DISK_NEWCHANGE);*/
 763                 return 1;
 764         } else {
 765                 UDRS->last_checked=jiffies;
 766                 UCLEARF(FD_DISK_NEWCHANGE);
 767         }
 768         return 0;
 769 }
 770 
 771 static inline int is_selected(int dor, int unit)
     /*  */
 772 {
 773         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 774 }
 775 
 776 static int set_dor(int fdc, char mask, char data)
     /*  */
 777 {
 778         register unsigned char drive, unit, newdor,olddor;
 779 
 780         if(FDCS->address == -1)
 781                 return -1;
 782 
 783         olddor = FDCS->dor;
 784         newdor =  (olddor & mask) | data;
 785         if ( newdor != olddor ){
 786                 unit = olddor & 0x3;
 787                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 788                         drive = REVDRIVE(fdc,unit);
 789 #ifdef DCL_DEBUG
 790                         if (UDP->flags & FD_DEBUG){
 791                                 DPRINT("calling disk change from set_dor\n");
 792                         }
 793 #endif
 794                         disk_change(drive);
 795                 }
 796                 FDCS->dor = newdor;
 797                 outb_p(newdor, FD_DOR);
 798 
 799                 unit = newdor & 0x3;
 800                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 801                         drive = REVDRIVE(fdc,unit);
 802                         UDRS->select_date = jiffies;
 803                 }
 804         }
 805         if ( newdor & 0xf0 )
 806                 floppy_grab_irq_and_dma();
 807         if( olddor & 0xf0 )
 808                 floppy_release_irq_and_dma();
 809         return olddor;
 810 }
 811 
 812 static void twaddle(void)
     /*  */
 813 {
 814         if (DP->select_delay)
 815                 return;
 816         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 817         outb_p(FDCS->dor, FD_DOR);
 818         DRS->select_date = jiffies;
 819 }
 820 
 821 /* reset all driver information about the current fdc. This is needed after
 822  * a reset, and after a raw command. */
 823 static void reset_fdc_info(int mode)
     /*  */
 824 {
 825         int drive;
 826 
 827         FDCS->spec1 = FDCS->spec2 = -1;
 828         FDCS->need_configure = 1;
 829         FDCS->perp_mode = 1;
 830         FDCS->rawcmd = 0;
 831         for ( drive = 0; drive < N_DRIVE; drive++)
 832                 if (FDC(drive) == fdc &&
 833                     ( mode || UDRS->track != NEED_1_RECAL))
 834                         UDRS->track = NEED_2_RECAL;
 835 }
 836 
 837 /* selects the fdc and drive, and enables the fdc's input/dma. */
 838 static void set_fdc(int drive)
     /*  */
 839 {
 840         if (drive >= 0 && drive < N_DRIVE){
 841                 fdc = FDC(drive);
 842                 current_drive = drive;
 843         }
 844         set_dor(fdc,~0,8);
 845         set_dor(1-fdc, ~8, 0);
 846         if ( FDCS->rawcmd == 2 )
 847                 reset_fdc_info(1);
 848         if( inb_p(FD_STATUS) != STATUS_READY )
 849                 FDCS->reset = 1;
 850 }
 851 
 852 /* locks the driver */
 853 static int lock_fdc(int drive, int interruptible)
     /*  */
 854 {
 855         if(!usage_count){
 856                 printk("trying to lock fdc while usage count=0\n");
 857                 return -1;
 858         }
 859         floppy_grab_irq_and_dma();
 860         cli();
 861         while (fdc_busy && NO_SIGNAL)
 862                 interruptible_sleep_on(&fdc_wait);
 863         if(fdc_busy){
 864                 sti();
 865                 return -EINTR;
 866         }
 867         fdc_busy = 1;
 868         sti();
 869         command_status = FD_COMMAND_NONE;
 870         set_fdc(drive);
 871         reschedule_timeout(drive, "lock fdc", 0);
 872         return 0;
 873 }
 874 
 875 #define LOCK_FDC(drive,interruptible) \
 876 if(lock_fdc(drive,interruptible)) return -EINTR;
 877 
 878 
 879 /* unlocks the driver */
 880 static inline void unlock_fdc(void)
     /*  */
 881 {
 882         raw_cmd = 0;
 883         if (!fdc_busy)
 884                 DPRINT("FDC access conflict!\n");
 885 
 886         if ( DEVICE_INTR )
 887                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 888                         DEVICE_INTR);
 889         command_status = FD_COMMAND_NONE;
 890         del_timer(&fd_timeout);
 891         cont = NULL;
 892         fdc_busy = 0;
 893         floppy_release_irq_and_dma();
 894         wake_up(&fdc_wait);
 895 }
 896 
 897 /* switches the motor off after a given timeout */
 898 static void motor_off_callback(unsigned long nr)
     /*  */
 899 {
 900         unsigned char mask = ~(0x10 << UNIT(nr));
 901 
 902         set_dor( FDC(nr), mask, 0 );
 903 }
 904 
 905 static struct timer_list motor_off_timer[N_DRIVE] = {
 906         { NULL, NULL, 0, 0, motor_off_callback },
 907         { NULL, NULL, 0, 1, motor_off_callback },
 908         { NULL, NULL, 0, 2, motor_off_callback },
 909         { NULL, NULL, 0, 3, motor_off_callback },
 910         { NULL, NULL, 0, 4, motor_off_callback },
 911         { NULL, NULL, 0, 5, motor_off_callback },
 912         { NULL, NULL, 0, 6, motor_off_callback },
 913         { NULL, NULL, 0, 7, motor_off_callback }
 914 };
 915 
 916 /* schedules motor off */
 917 static void floppy_off(unsigned int drive)
     /*  */
 918 {
 919         unsigned long volatile delta;
 920         register int fdc=FDC(drive);
 921 
 922         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 923                 return;
 924 
 925         del_timer(motor_off_timer+drive);
 926 
 927         /* make spindle stop in a position which minimizes spinup time
 928          * next time */
 929         if (UDP->rps ){
 930                 delta = jiffies - UDRS->first_read_date + HZ -
 931                         UDP->spindown_offset;
 932                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 933                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 934         }
 935         add_timer(motor_off_timer+drive);
 936 }
 937 
 938 /*
 939  * cycle through all N_DRIVE floppy drives, for disk change testing.
 940  * stopping at current drive. This is done before any long operation, to
 941  * be sure to have up to date disk change information.
 942  */
 943 static void scandrives(void)
     /*  */
 944 {
 945         int i, drive, saved_drive;
 946 
 947         if (DP->select_delay)
 948                 return;
 949 
 950         saved_drive = current_drive;
 951         for(i=0; i< N_DRIVE; i++){
 952                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 953                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 954                         continue; /* skip closed drives */
 955                 set_fdc(drive);
 956                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 957                       (0x10 << UNIT(drive))))
 958                         /* switch the motor off again, if it was off to
 959                          * begin with */
 960                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 961         }
 962         set_fdc(saved_drive);
 963 }
 964 
 965 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 966 
 967 /* this function makes sure that the disk stays in the drive during the
 968  * transfer */
 969 static void fd_watchdog(void)
     /*  */
 970 {
 971 #ifdef DCL_DEBUG
 972         if (DP->flags & FD_DEBUG){
 973                 DPRINT("calling disk change from watchdog\n");
 974         }
 975 #endif
 976 
 977         if ( disk_change(current_drive) ){
 978                 DPRINT("disk removed during i/o\n");
 979                 floppy_shutdown();
 980         } else {
 981                 del_timer(&fd_timer);
 982                 fd_timer.function = (timeout_fn) fd_watchdog;
 983                 fd_timer.expires = jiffies + HZ / 10;
 984                 add_timer(&fd_timer);
 985         }
 986 }
 987 
 988 static void main_command_interrupt(void)
     /*  */
 989 {
 990         del_timer(&fd_timer);
 991         cont->interrupt();
 992 }
 993 
 994 /* waits for a delay (spinup or select) to pass */
 995 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 996 {
 997         if ( FDCS->reset ){
 998                 reset_fdc(); /* do the reset during sleep to win time
 999                               * if we don't need to sleep, it's a good
1000                               * occasion anyways */
1001                 return 1;
1002         }
1003 
1004         if ( jiffies < delay ){
1005                 del_timer(&fd_timer);
1006                 fd_timer.function = function;
1007                 fd_timer.expires = delay;
1008                 add_timer(&fd_timer);
1009                 return 1;
1010         }
1011         return 0;
1012 }
1013 
1014 static int hlt_disabled=0;
1015 static void floppy_disable_hlt(void)
     /*  */
1016 {
1017         unsigned long flags;
1018         save_flags(flags);
1019         cli();
1020         if(!hlt_disabled){
1021                 hlt_disabled=1;
1022 #ifdef HAVE_DISABLE_HLT
1023                 disable_hlt();
1024 #endif
1025         }
1026         restore_flags(flags);
1027 }
1028 
1029 static void floppy_enable_hlt(void)
     /*  */
1030 {
1031         unsigned long flags;
1032         save_flags(flags);
1033         cli();
1034         if(hlt_disabled){
1035                 hlt_disabled=0;
1036 #ifdef HAVE_DISABLE_HLT
1037                 enable_hlt();
1038 #endif
1039         }
1040         restore_flags(flags);
1041 }
1042 
1043 
1044 static void setup_DMA(void)
     /*  */
1045 {
1046 #ifdef CONFIG_FLOPPY_SANITY
1047         if (raw_cmd->length == 0){
1048                 int i;
1049 
1050                 printk("zero dma transfer size:");
1051                 for(i=0; i< raw_cmd->cmd_count; i++)
1052                         printk("%x,", raw_cmd->cmd[i]);
1053                 printk("\n");
1054                 cont->done(0);
1055                 FDCS->reset = 1;
1056                 return;
1057         }
1058 #if 0
1059         /* disabled because of new buffer location for raw cmd */
1060         if ((!CURRENT ||
1061              CURRENT->buffer != raw_cmd->kernel_data ||
1062              raw_cmd->length > 512 * CURRENT->nr_sectors) &&
1063             (raw_cmd->kernel_data < floppy_track_buffer ||
1064              raw_cmd->kernel_data + raw_cmd->length >
1065              floppy_track_buffer + 1024 * max_buffer_sectors)){
1066                 printk("bad address. start=%p lg=%lx tb=%p\n",
1067                        raw_cmd->kernel_data, raw_cmd->length, 
1068                        floppy_track_buffer);
1069                 if ( CURRENT ){
1070                         printk("buffer=%p nr=%lx cnr=%lx\n",
1071                                CURRENT->buffer, CURRENT->nr_sectors,
1072                                CURRENT->current_nr_sectors);
1073                 }
1074                 cont->done(0);
1075                 FDCS->reset=1;
1076                 return;
1077         }
1078 #endif
1079         if ((long) raw_cmd->kernel_data % 512 ){
1080                 printk("non aligned address: %p\n", raw_cmd->kernel_data );
1081                 cont->done(0);
1082                 FDCS->reset=1;
1083                 return;
1084         }
1085         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
1086                 printk("DMA crossing 64-K boundary %p-%p\n",
1087                        raw_cmd->kernel_data,
1088                        raw_cmd->kernel_data + raw_cmd->length);
1089                 cont->done(0);
1090                 FDCS->reset=1;
1091                 return;
1092         }
1093 #endif
1094         cli();
1095         disable_dma(FLOPPY_DMA);
1096         clear_dma_ff(FLOPPY_DMA);
1097         set_dma_mode(FLOPPY_DMA,
1098                      (raw_cmd->flags & FD_RAW_READ)?
1099                      DMA_MODE_READ : DMA_MODE_WRITE);
1100         set_dma_addr(FLOPPY_DMA, virt_to_bus(raw_cmd->kernel_data));
1101         set_dma_count(FLOPPY_DMA, raw_cmd->length);
1102         enable_dma(FLOPPY_DMA);
1103         sti();
1104         floppy_disable_hlt();
1105 }
1106 
1107 /* sends a command byte to the fdc */
1108 static int output_byte(char byte)
     /*  */
1109 {
1110         int counter;
1111         unsigned char status = 0;
1112         unsigned char rstatus;
1113 
1114         if (FDCS->reset)
1115                 return -1;
1116         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1117                 rstatus = inb_p(FD_STATUS);
1118                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1119                 if (!(status & STATUS_READY))
1120                         continue;
1121                 if (status == STATUS_READY){
1122                         outb_p(byte,FD_DATA);
1123 
1124 #ifdef CONFIG_FLOPPY_SANITY
1125                         output_log[output_log_pos].data = byte;
1126                         output_log[output_log_pos].status = rstatus;
1127                         output_log[output_log_pos].jiffies = jiffies;
1128                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1129 #endif
1130                         return 0;
1131                 } else
1132                         break;
1133         }
1134         FDCS->reset = 1;
1135         if ( !initialising )
1136                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1137                         byte, status);
1138         return -1;
1139 }
1140 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
1141 
1142 /* gets the response from the fdc */
1143 static int result(void)
     /*  */
1144 {
1145         int i = 0, counter, status = 0;
1146 
1147         if (FDCS->reset)
1148                 return -1;
1149         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1150                 status = inb_p(FD_STATUS)&
1151                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1152                 if (!(status & STATUS_READY))
1153                         continue;
1154                 if (status == STATUS_READY){
1155 #ifdef CONFIG_FLOPPY_SANITY
1156                         resultjiffies = jiffies;
1157                         resultsize = i;
1158 #endif
1159                         return i;
1160                 }
1161                 if (status & STATUS_DMA )
1162                         break;
1163                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1164                         if (i >= MAX_REPLIES) {
1165                                 DPRINT("floppy_stat reply overrun\n");
1166                                 break;
1167                         }
1168                         reply_buffer[i++] = inb_p(FD_DATA);
1169                 }
1170         }
1171         FDCS->reset = 1;
1172         if ( !initialising )
1173                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1174                         status, fdc, i);
1175         return -1;
1176 }
1177 
1178 /* Set perpendicular mode as required, based on data rate, if supported.
1179  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1180  */
1181 static inline void perpendicular_mode(void)
     /*  */
1182 {
1183         unsigned char perp_mode;
1184 
1185         if (!floppy)
1186                 return;
1187         if (floppy->rate & 0x40){
1188                 switch(raw_cmd->rate){
1189                         case 0:
1190                                 perp_mode=2;
1191                                 break;
1192                         case 3:
1193                                 perp_mode=3;
1194                                 break;
1195                         default:
1196                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1197                                 cont->done(0);
1198                                 FDCS->reset = 1; /* convenient way to return to
1199                                                   * redo without to much hassle (deep
1200                                                   * stack et al. */
1201                                 return;
1202                 }
1203         } else
1204                 perp_mode = 0;
1205 
1206         if ( FDCS->perp_mode == perp_mode )
1207                 return;
1208         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1209                 output_byte(FD_PERPENDICULAR);
1210                 output_byte(perp_mode);
1211                 FDCS->perp_mode = perp_mode;
1212         } else if (perp_mode) {
1213                 DPRINT("perpendicular mode not supported by this FDC.\n");
1214         }
1215 } /* perpendicular_mode */
1216 
1217 #define NOMINAL_DTR 500
1218 
1219 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1220  * head load time, and DMA disable flag to values needed by floppy.
1221  *
1222  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1223  * to account for the data rate-based scaling done by the 82072 and 82077
1224  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1225  * 8272a).
1226  *
1227  * Note that changing the data transfer rate has a (probably deleterious)
1228  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1229  * fdc_specify is called again after each data transfer rate
1230  * change.
1231  *
1232  * srt: 1000 to 16000 in microseconds
1233  * hut: 16 to 240 milliseconds
1234  * hlt: 2 to 254 milliseconds
1235  *
1236  * These values are rounded up to the next highest available delay time.
1237  */
1238 static void fdc_specify(void)
     /*  */
1239 {
1240         unsigned char spec1, spec2;
1241         int srt, hlt, hut;
1242         unsigned long dtr = NOMINAL_DTR;
1243         unsigned long scale_dtr = NOMINAL_DTR;
1244         int hlt_max_code = 0x7f;
1245         int hut_max_code = 0xf;
1246 
1247         if (FDCS->need_configure && FDCS->has_fifo) {
1248                 if ( FDCS->reset )
1249                         return;
1250                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1251                 /* TODO: lock this in via LOCK during initialization */
1252                 output_byte(FD_CONFIGURE);
1253                 output_byte(0);
1254                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1255                 output_byte(0);         /* precompensation from track 0 upwards */
1256                 if ( FDCS->reset ){
1257                         FDCS->has_fifo=0;
1258                         return;
1259                 }
1260                 FDCS->need_configure = 0;
1261                 /*DPRINT("FIFO enabled\n");*/
1262         }
1263 
1264         switch (raw_cmd->rate & 0x03) {
1265                 case 3:
1266                         dtr = 1000;
1267                         break;
1268                 case 1:
1269                         dtr = 300;
1270                         break;
1271                 case 2:
1272                         dtr = 250;
1273                         break;
1274         }
1275 
1276         if (FDCS->version >= FDC_82072) {
1277                 scale_dtr = dtr;
1278                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1279                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1280         }
1281 
1282         /* Convert step rate from microseconds to milliseconds and 4 bits */
1283         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1284         if (srt > 0xf)
1285                 srt = 0xf;
1286         else if (srt < 0)
1287                 srt = 0;
1288 
1289         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1290         if (hlt < 0x01)
1291                 hlt = 0x01;
1292         else if (hlt > 0x7f)
1293                 hlt = hlt_max_code;
1294 
1295         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1296         if (hut < 0x1)
1297                 hut = 0x1;
1298         else if (hut > 0xf)
1299                 hut = hut_max_code;
1300 
1301         spec1 = (srt << 4) | hut;
1302         spec2 = (hlt << 1);
1303 
1304         /* If these parameters did not change, just return with success */
1305         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1306                 /* Go ahead and set spec1 and spec2 */
1307                 output_byte(FD_SPECIFY);
1308                 output_byte(FDCS->spec1 = spec1);
1309                 output_byte(FDCS->spec2 = spec2);
1310         }
1311 } /* fdc_specify */
1312 
1313 /* Set the FDC's data transfer rate on behalf of the specified drive.
1314  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1315  * of the specify command (i.e. using the fdc_specify function).
1316  */
1317 static int fdc_dtr(void)
     /*  */
1318 {
1319         /* If data rate not already set to desired value, set it. */
1320         if ( raw_cmd->rate == FDCS->dtr)
1321                 return 0;
1322 
1323         /* Set dtr */
1324         outb_p(raw_cmd->rate, FD_DCR);
1325 
1326         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1327          * need a stabilization period of several milliseconds to be
1328          * enforced after data rate changes before R/W operations.
1329          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1330          */
1331         FDCS->dtr = raw_cmd->rate;
1332         return(wait_for_completion(jiffies+2*HZ/100,
1333                                    (timeout_fn) floppy_ready));
1334 } /* fdc_dtr */
1335 
1336 static void tell_sector(void)
     /*  */
1337 {
1338         printk(": track %d, head %d, sector %d, size %d",
1339                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1340 } /* tell_sector */
1341 
1342 
1343 /*
1344  * Ok, this error interpreting routine is called after a
1345  * DMA read/write has succeeded
1346  * or failed, so we check the results, and copy any buffers.
1347  * hhb: Added better error reporting.
1348  * ak: Made this into a separate routine.
1349  */
1350 static int interpret_errors(void)
     /*  */
1351 {
1352         char bad;
1353 
1354         if (inr!=7) {
1355                 DPRINT("-- FDC reply error");
1356                 FDCS->reset = 1;
1357                 return 1;
1358         }
1359 
1360         /* check IC to find cause of interrupt */
1361         switch (ST0 & ST0_INTR) {
1362                 case 0x40:      /* error occurred during command execution */
1363                         bad = 1;
1364                         if (ST1 & ST1_WP) {
1365                                 DPRINT("Drive is write protected\n");
1366                                 CLEARF(FD_DISK_WRITABLE);
1367                                 cont->done(0);
1368                                 bad = 2;
1369                         } else if (ST1 & ST1_ND) {
1370                                 SETF(FD_NEED_TWADDLE);
1371                         } else if (ST1 & ST1_OR) {
1372                                 if (DP->flags & FTD_MSG )
1373                                         DPRINT("Over/Underrun - retrying\n");
1374                                 bad = 0;
1375                         }else if(*errors >= DP->max_errors.reporting){
1376                                 DPRINT("");
1377                                 if (ST0 & ST0_ECE) {
1378                                         printk("Recalibrate failed!");
1379                                 } else if (ST2 & ST2_CRC) {
1380                                         printk("data CRC error");
1381                                         tell_sector();
1382                                 } else if (ST1 & ST1_CRC) {
1383                                         printk("CRC error");
1384                                         tell_sector();
1385                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1386                                         if (!probing) {
1387                                                 printk("sector not found");
1388                                                 tell_sector();
1389                                         } else
1390                                                 printk("probe failed...");
1391                                 } else if (ST2 & ST2_WC) {      /* seek error */
1392                                         printk("wrong cylinder");
1393                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1394                                         printk("bad cylinder");
1395                                 } else {
1396                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1397                                         tell_sector();
1398                                 }
1399                                 printk("\n");
1400 
1401                         }
1402                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1403                                 /* wrong cylinder => recal */
1404                                 DRS->track = NEED_2_RECAL;
1405                         return bad;
1406                 case 0x80: /* invalid command given */
1407                         DPRINT("Invalid FDC command given!\n");
1408                         cont->done(0);
1409                         return 2;
1410                 case 0xc0:
1411                         DPRINT("Abnormal termination caused by polling\n");
1412                         cont->error();
1413                         return 2;
1414                 default: /* (0) Normal command termination */
1415                         return 0;
1416         }
1417 }
1418 
1419 /*
1420  * This routine is called when everything should be correctly set up
1421  * for the transfer (ie floppy motor is on, the correct floppy is
1422  * selected, and the head is sitting on the right track).
1423  */
1424 static void setup_rw_floppy(void)
     /*  */
1425 {
1426         int i,ready_date,r, flags,dflags;
1427         timeout_fn function;
1428 
1429         flags = raw_cmd->flags;
1430         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1431                 flags |= FD_RAW_INTR;
1432 
1433         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1434                 ready_date = DRS->spinup_date + DP->spinup;
1435                 /* If spinup will take a long time, rerun scandrives
1436                  * again just before spinup completion. Beware that
1437                  * after scandrives, we must again wait for selection.
1438                  */
1439                 if ( ready_date > jiffies + DP->select_delay){
1440                         ready_date -= DP->select_delay;
1441                         function = (timeout_fn) floppy_start;
1442                 } else
1443                         function = (timeout_fn) setup_rw_floppy;
1444 
1445                 /* wait until the floppy is spinning fast enough */
1446                 if (wait_for_completion(ready_date,function))
1447                         return;
1448         }
1449         dflags = DRS->flags;
1450 
1451         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1452                 setup_DMA();
1453 
1454         if ( flags & FD_RAW_INTR )
1455                 SET_INTR(main_command_interrupt);
1456 
1457         r=0;
1458         for(i=0; i< raw_cmd->cmd_count; i++)
1459                 r|=output_byte( raw_cmd->cmd[i] );
1460 
1461 #ifdef DEBUGT
1462         debugt("rw_command: ");
1463 #endif
1464         if ( r ){
1465                 reset_fdc();
1466                 return;
1467         }
1468 
1469         if ( ! ( flags & FD_RAW_INTR )){
1470                 inr = result();
1471                 cont->interrupt();
1472         } else if ( flags & FD_RAW_NEED_DISK )
1473                 fd_watchdog();
1474 }
1475 
1476 static int blind_seek;
1477 
1478 /*
1479  * This is the routine called after every seek (or recalibrate) interrupt
1480  * from the floppy controller.
1481  */
1482 static void seek_interrupt(void)
     /*  */
1483 {
1484 #ifdef DEBUGT
1485         debugt("seek interrupt:");
1486 #endif
1487         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1488                 DPRINT("seek failed\n");
1489                 DRS->track = NEED_2_RECAL;
1490                 cont->error();
1491                 cont->redo();
1492                 return;
1493         }
1494         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1495 #ifdef DCL_DEBUG
1496                 if (DP->flags & FD_DEBUG){
1497                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1498                         DPRINT1("jiffies=%ld\n", jiffies);
1499                 }
1500 #endif
1501                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1502                 DRS->select_date = jiffies;
1503         }
1504         DRS->track = ST1;
1505         floppy_ready();
1506 }
1507 
1508 static void check_wp(void)
     /*  */
1509 {
1510         if (TESTF(FD_VERIFY)) {
1511                 /* check write protection */
1512                 output_byte( FD_GETSTATUS );
1513                 output_byte( UNIT(current_drive) );
1514                 if ( result() != 1 ){
1515                         FDCS->reset = 1;
1516                         return;
1517                 }
1518                 CLEARF(FD_VERIFY);
1519                 CLEARF(FD_NEED_TWADDLE);
1520 #ifdef DCL_DEBUG
1521                 if (DP->flags & FD_DEBUG){
1522                         DPRINT("checking whether disk is write protected\n");
1523                         DPRINT1("wp=%x\n",ST3 & 0x40);
1524                 }
1525 #endif
1526                 if (!( ST3  & 0x40))
1527                         SETF(FD_DISK_WRITABLE);
1528                 else
1529                         CLEARF(FD_DISK_WRITABLE);
1530         }
1531 }
1532 
1533 static void seek_floppy(void)
     /*  */
1534 {
1535         int track;
1536 
1537         blind_seek=0;
1538 
1539 #ifdef DCL_DEBUG
1540         if (DP->flags & FD_DEBUG){
1541                 DPRINT("calling disk change from seek\n");
1542         }
1543 #endif
1544 
1545         if (!TESTF(FD_DISK_NEWCHANGE) &&
1546             disk_change(current_drive) &&
1547             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1548                 /* the media changed flag should be cleared after the seek.
1549                  * If it isn't, this means that there is really no disk in
1550                  * the drive.
1551                  */
1552                 SETF(FD_DISK_CHANGED);
1553                 cont->done(0);
1554                 cont->redo();
1555                 return;
1556         }
1557         if ( DRS->track <= NEED_1_RECAL ){
1558                 recalibrate_floppy();
1559                 return;
1560         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1561                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1562                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1563                 /* we seek to clear the media-changed condition. Does anybody
1564                  * know a more elegant way, which works on all drives? */
1565                 if ( raw_cmd->track )
1566                         track = raw_cmd->track - 1;
1567                 else {
1568                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1569                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1570                                 blind_seek = 1;
1571                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1572                         }
1573                         track = 1;
1574                 }
1575         } else {
1576                 check_wp();
1577                 if (raw_cmd->track != DRS->track &&
1578                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1579                         track = raw_cmd->track;
1580                 else {
1581                         setup_rw_floppy();
1582                         return;
1583                 }
1584         }
1585 
1586         SET_INTR(seek_interrupt);
1587         output_byte(FD_SEEK);
1588         output_byte(UNIT(current_drive));
1589         LAST_OUT(track);
1590 #ifdef DEBUGT
1591         debugt("seek command:");
1592 #endif
1593 }
1594 
1595 static void recal_interrupt(void)
     /*  */
1596 {
1597 #ifdef DEBUGT
1598         debugt("recal interrupt:");
1599 #endif
1600         if (inr !=2 )
1601                 FDCS->reset = 1;
1602         else if (ST0 & ST0_ECE) {
1603                 switch(DRS->track){
1604                         case NEED_1_RECAL:
1605 #ifdef DEBUGT
1606                                 debugt("recal interrupt need 1 recal:");
1607 #endif
1608                                 /* after a second recalibrate, we still haven't
1609                                  * reached track 0. Probably no drive. Raise an
1610                                  * error, as failing immediately might upset
1611                                  * computers possessed by the Devil :-) */
1612                                 cont->error();
1613                                 cont->redo();
1614                                 return;
1615                         case NEED_2_RECAL:
1616 #ifdef DEBUGT
1617                                 debugt("recal interrupt need 2 recal:");
1618 #endif
1619                                 /* If we already did a recalibrate,
1620                                  * and we are not at track 0, this
1621                                  * means we have moved. (The only way
1622                                  * not to move at recalibration is to
1623                                  * be already at track 0.) Clear the
1624                                  * new change flag */
1625 #ifdef DCL_DEBUG
1626                                 if (DP->flags & FD_DEBUG){
1627                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1628                                 }
1629 #endif
1630 
1631                                 CLEARF(FD_DISK_NEWCHANGE);
1632                                 DRS->select_date = jiffies;
1633                                 /* fall through */
1634                         default:
1635 #ifdef DEBUGT
1636                                 debugt("recal interrupt default:");
1637 #endif
1638                                 /* Recalibrate moves the head by at
1639                                  * most 80 steps. If after one
1640                                  * recalibrate we don't have reached
1641                                  * track 0, this might mean that we
1642                                  * started beyond track 80.  Try
1643                                  * again.  */
1644                                 DRS->track = NEED_1_RECAL;
1645                                 break;
1646                 }
1647         } else
1648                 DRS->track = ST1;
1649         floppy_ready();
1650 }
1651 
1652 /*
1653  * Unexpected interrupt - Print as much debugging info as we can...
1654  * All bets are off...
1655  */
1656 static void unexpected_floppy_interrupt(void)
     /*  */
1657 {
1658         int i;
1659         if ( initialising )
1660                 return;
1661         if(print_unex){
1662                 DPRINT("unexpected interrupt\n");
1663                 if ( inr >= 0 )
1664                         for(i=0; i<inr; i++)
1665                                 printk("%d %x\n", i, reply_buffer[i] );
1666         }
1667         while(1){
1668                 output_byte(FD_SENSEI);
1669                 inr=result();
1670                 if ( inr != 2 )
1671                         break;
1672                 if(print_unex){
1673                         printk("sensei\n");
1674                         for(i=0; i<inr; i++)
1675                                 printk("%d %x\n", i, reply_buffer[i] );
1676                 }
1677         }
1678         FDCS->reset = 1;
1679 }
1680 
1681 struct tq_struct floppy_tq =
1682 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1683 
1684 /* interrupt handler */
1685 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1686 {
1687         void (*handler)(void) = DEVICE_INTR;
1688 
1689         lasthandler = handler;
1690         interruptjiffies = jiffies;
1691 
1692         floppy_enable_hlt();
1693         CLEAR_INTR;
1694         if ( fdc >= N_FDC || FDCS->address == -1){
1695                 /* we don't even know which FDC is the culprit */
1696                 printk("DOR0=%x\n", fdc_state[0].dor);
1697                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1698                 printk("handler=%p\n", handler);
1699                 is_alive("bizarre fdc");
1700                 return;
1701         }
1702         inr = result();
1703         if (!handler){
1704                 unexpected_floppy_interrupt();
1705                 is_alive("unexpected");
1706                 return;
1707         }
1708         if ( inr == 0 ){
1709                 do {
1710                         output_byte(FD_SENSEI);
1711                         inr = result();
1712                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1713         }
1714         floppy_tq.routine = (void *)(void *) handler;
1715         queue_task_irq(&floppy_tq, &tq_timer);
1716         is_alive("normal interrupt end");
1717 }
1718 
1719 static void recalibrate_floppy(void)
     /*  */
1720 {
1721 #ifdef DEBUGT
1722         debugt("recalibrate floppy:");
1723 #endif
1724         SET_INTR(recal_interrupt);
1725         output_byte(FD_RECALIBRATE);
1726         LAST_OUT(UNIT(current_drive));
1727 }
1728 
1729 /*
1730  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1731  */
1732 static void reset_interrupt(void)
     /*  */
1733 {
1734 #ifdef DEBUGT
1735         debugt("reset interrupt:");
1736 #endif
1737         /* fdc_specify();          reprogram fdc */
1738         result();               /* get the status ready for set_fdc */
1739         if ( FDCS->reset )
1740                 cont->error(); /* a reset just after a reset. BAD! */
1741         cont->redo();
1742 }
1743 
1744 /*
1745  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1746  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1747  */
1748 static void reset_fdc(void)
     /*  */
1749 {
1750         SET_INTR(reset_interrupt);
1751         FDCS->reset = 0;
1752         reset_fdc_info(0);
1753         if ( FDCS->version >= FDC_82077 )
1754                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1755         else {
1756                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1757                 udelay(FD_RESET_DELAY);
1758                 outb(FDCS->dor, FD_DOR);
1759         }
1760 }
1761 
1762 static void empty(void)
     /*  */
1763 {
1764 }
1765 
1766 void show_floppy(void)
     /*  */
1767 {
1768         int i;
1769 
1770         printk("\n");
1771         printk("floppy driver state\n");
1772         printk("-------------------\n");
1773         printk("now=%ld last interrupt=%d last called handler=%p\n",
1774                jiffies, interruptjiffies, lasthandler);
1775 
1776 
1777 #ifdef CONFIG_FLOPPY_SANITY
1778         printk("timeout_message=%s\n", timeout_message);
1779         printk("last output bytes:\n");
1780         for(i=0; i < OLOGSIZE; i++)
1781                 printk("%2x %2x %ld\n",
1782                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1783                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1784                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1785         printk("last result at %d\n", resultjiffies);
1786         printk("last redo_fd_request at %d\n", lastredo);
1787         for(i=0; i<resultsize; i++){
1788                 printk("%2x ", reply_buffer[i]);
1789         }
1790         printk("\n");
1791 #endif
1792 
1793 #if 0
1794         for(i=0; i<N_FDC; i++){
1795                 if(FDCS->address != -1){
1796                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1797                         outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1798                         udelay(1000); /* maybe we'll catch an interrupt... */
1799                 }
1800         }
1801 #endif
1802         printk("status=%x\n", inb_p(FD_STATUS));
1803         printk("fdc_busy=%d\n", fdc_busy);
1804         if( DEVICE_INTR)
1805                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1806         if(floppy_tq.sync)
1807                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1808         if(fd_timer.prev)
1809                 printk("fd_timer.function=%p\n", fd_timer.function);
1810         if(fd_timeout.prev){
1811                 printk("timer_table=%p\n",fd_timeout.function);
1812                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1813                 printk("now=%ld\n",jiffies);
1814         }
1815         printk("cont=%p\n", cont);
1816         printk("CURRENT=%p\n", CURRENT);
1817         printk("command_status=%d\n", command_status);
1818         printk("\n");
1819 }
1820 
1821 static void floppy_shutdown(void)
     /*  */
1822 {
1823         if(!initialising)
1824                 show_floppy();
1825         CLEAR_INTR;
1826         floppy_tq.routine = (void *)(void *) empty;
1827         del_timer( &fd_timer);
1828         sti();
1829 
1830         floppy_enable_hlt();
1831         disable_dma(FLOPPY_DMA);
1832         /* avoid dma going to a random drive after shutdown */
1833 
1834         if(!initialising)
1835                 DPRINT("floppy timeout\n");
1836         FDCS->reset = 1;
1837         if (cont){
1838                 cont->done(0);
1839                 cont->redo(); /* this will recall reset when needed */
1840         } else {
1841                 printk("no cont in shutdown!\n");
1842                 process_fd_request();
1843         }
1844         is_alive("floppy shutdown");
1845 }
1846 /*typedef void (*timeout_fn)(unsigned long);*/
1847 
1848 /* start motor, check media-changed condition and write protection */
1849 static int start_motor( void (*function)(void)  )
     /*  */
1850 {
1851         int mask, data;
1852 
1853         mask = 0xfc;
1854         data = UNIT(current_drive);
1855         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1856                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1857                         set_debugt();
1858                         /* no read since this drive is running */
1859                         DRS->first_read_date = 0;
1860                         /* note motor start time if motor is not yet running */
1861                         DRS->spinup_date = jiffies;
1862                         data |= (0x10 << UNIT(current_drive));
1863                 }
1864         } else
1865                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1866                         mask &= ~(0x10 << UNIT(current_drive));
1867 
1868         /* starts motor and selects floppy */
1869         del_timer(motor_off_timer + current_drive);
1870         set_dor( fdc, mask, data);
1871 
1872         /* wait_for_completion also schedules reset if needed. */
1873         return(wait_for_completion(DRS->select_date+DP->select_delay,
1874                                    (timeout_fn) function));
1875 }
1876 
1877 static void floppy_ready(void)
     /*  */
1878 {
1879         CHECK_RESET;
1880         if(start_motor(floppy_ready)) return;
1881         if(fdc_dtr()) return;
1882 
1883 #ifdef DCL_DEBUG
1884         if (DP->flags & FD_DEBUG){
1885                 DPRINT("calling disk change from floppy_ready\n");
1886         }
1887 #endif
1888 
1889         if(!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1890            disk_change(current_drive) &&
1891            !DP->select_delay)
1892                 twaddle(); /* this clears the dcl on certain drive/controller
1893                             * combinations */
1894 
1895         if ( raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1896                 perpendicular_mode();
1897                 fdc_specify(); /* must be done here because of hut, hlt ... */
1898                 seek_floppy();
1899         } else
1900                 setup_rw_floppy();
1901 }
1902 
1903 static void floppy_start(void)
     /*  */
1904 {
1905         reschedule_timeout(CURRENTD, "floppy start", 0);
1906 
1907         scandrives();
1908 #ifdef DCL_DEBUG
1909         if (DP->flags & FD_DEBUG){
1910                 DPRINT("setting NEWCHANGE in floppy_start\n");
1911         }
1912 #endif
1913         SETF(FD_DISK_NEWCHANGE);
1914         floppy_ready();
1915 }
1916 
1917 /*
1918  * ========================================================================
1919  * here ends the bottom half. Exported routines are:
1920  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1921  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1922  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1923  * and set_dor.
1924  * ========================================================================
1925  */
1926 /*
1927  * General purpose continuations.
1928  * ==============================
1929  */
1930 
1931 static void do_wakeup(void)
     /*  */
1932 {
1933         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1934         cont = 0;
1935         command_status += 2;
1936         wake_up(&command_done);
1937 }
1938 
1939 static struct cont_t wakeup_cont={
1940         empty,
1941         do_wakeup,
1942         empty,
1943         (done_f)empty
1944 };
1945 
1946 static int wait_til_done(void (*handler)(void ), int interruptible)
     /*  */
1947 {
1948         int ret;
1949 
1950         floppy_tq.routine = (void *)(void *) handler;
1951         queue_task(&floppy_tq, &tq_timer);
1952 
1953         cli();
1954         while(command_status < 2 && NO_SIGNAL){
1955                 is_alive("wait_til_done");
1956                 if(interruptible)
1957                         interruptible_sleep_on(&command_done);
1958                 else
1959                         sleep_on(&command_done);
1960         }
1961         if(command_status < 2){
1962                 floppy_shutdown();
1963                 sti();
1964                 process_fd_request();
1965                 return -EINTR;
1966         }
1967         sti();
1968 
1969         if ( FDCS->reset )
1970                 command_status = FD_COMMAND_ERROR;
1971         if ( command_status == FD_COMMAND_OKAY )
1972                 ret=0;
1973         else
1974                 ret=-EIO;
1975         command_status = FD_COMMAND_NONE;
1976         return ret;
1977 }
1978 
1979 static void generic_done(int result)
     /*  */
1980 {
1981         command_status = result;
1982         cont = &wakeup_cont;
1983 }
1984 
1985 static void generic_success(void)
     /*  */
1986 {
1987         cont->done(1);
1988 }
1989 
1990 static void generic_failure(void)
     /*  */
1991 {
1992         cont->done(0);
1993 }
1994 
1995 static void success_and_wakeup(void)
     /*  */
1996 {
1997         generic_success();
1998         cont->redo();
1999 }
2000 
2001 
2002 /*
2003  * formatting and rw support.
2004  * ==========================
2005  */
2006 
2007 static int next_valid_format(void)
     /*  */
2008 {
2009         int probed_format;
2010 
2011         probed_format = DRS->probed_format;
2012         while(1){
2013                 if ( probed_format >= 8 ||
2014                      ! DP->autodetect[probed_format] ){
2015                         DRS->probed_format = 0;
2016                         return 1;
2017                 }
2018                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
2019                         DRS->probed_format = probed_format;
2020                         return 0;
2021                 }
2022                 probed_format++;
2023         }
2024 }
2025 
2026 static void bad_flp_intr(void)
     /*  */
2027 {
2028         if ( probing ){
2029                 DRS->probed_format++;
2030                 if ( !next_valid_format())
2031                         return;
2032         }
2033         (*errors)++;
2034         if (*errors > DRWE->badness)
2035                 DRWE->badness = *errors;
2036         if (*errors > DP->max_errors.abort)
2037                 cont->done(0);
2038         if (*errors > DP->max_errors.reset)
2039                 FDCS->reset = 1;
2040         else if (*errors > DP->max_errors.recal)
2041                 DRS->track = NEED_2_RECAL;
2042 }
2043 
2044 static void set_floppy(kdev_t device)
     /*  */
2045 {
2046         if (TYPE(device))
2047                 floppy = TYPE(device) + floppy_type;
2048         else
2049                 floppy = current_type[ DRIVE(device) ];
2050 }
2051 
2052 /*
2053  * formatting and support.
2054  * =======================
2055  */
2056 static void format_interrupt(void)
     /*  */
2057 {
2058         switch (interpret_errors()){
2059                 case 1:
2060                         cont->error();
2061                 case 2:
2062                         break;
2063                 case 0:
2064                         cont->done(1);
2065         }
2066         cont->redo();
2067 }
2068 
2069 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
2070 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
2071 #define CT(x) ( (x) | 0x40 )
2072 static void setup_format_params(int track)
     /*  */
2073 {
2074         struct fparm {
2075                 unsigned char track,head,sect,size;
2076         } *here = (struct fparm *)floppy_track_buffer;
2077         int il,n;
2078         int count,head_shift,track_shift;
2079 
2080         raw_cmd = &default_raw_cmd;
2081         raw_cmd->track = track;
2082 
2083         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2084                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
2085         raw_cmd->rate = floppy->rate & 0x3;
2086         raw_cmd->cmd_count = NR_F;
2087         COMMAND = FM_MODE(floppy,FD_FORMAT);
2088         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
2089         F_SIZECODE = FD_SIZECODE(floppy);
2090         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
2091         F_GAP = floppy->fmt_gap;
2092         F_FILL = FD_FILL_BYTE;
2093 
2094         raw_cmd->kernel_data = floppy_track_buffer;
2095         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2096 
2097         /* allow for about 30ms for data transport per track */
2098         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
2099 
2100         /* a ``cylinder'' is two tracks plus a little stepping time */
2101         track_shift = 2 * head_shift + 3;
2102 
2103         /* position of logical sector 1 on this track */
2104         n = (track_shift * format_req.track + head_shift * format_req.head )
2105                 % F_SECT_PER_TRACK;
2106 
2107         /* determine interleave */
2108         il = 1;
2109         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2110                 il++;
2111 
2112         /* initialize field */
2113         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2114                 here[count].track = format_req.track;
2115                 here[count].head = format_req.head;
2116                 here[count].sect = 0;
2117                 here[count].size = F_SIZECODE;
2118         }
2119         /* place logical sectors */
2120         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2121                 here[n].sect = count;
2122                 n = (n+il) % F_SECT_PER_TRACK;
2123                 if (here[n].sect) { /* sector busy, find next free sector */
2124                         ++n;
2125                         if (n>= F_SECT_PER_TRACK) {
2126                                 n-=F_SECT_PER_TRACK;
2127                                 while (here[n].sect) ++n;
2128                         }
2129                 }
2130         }
2131 }
2132 
2133 static void redo_format(void)
     /*  */
2134 {
2135         buffer_track = -1;
2136         setup_format_params(format_req.track << STRETCH(floppy));
2137         floppy_start();
2138 #ifdef DEBUGT
2139         debugt("queue format request");
2140 #endif
2141 }
2142 
2143 static struct cont_t format_cont={
2144         format_interrupt,
2145         redo_format,
2146         bad_flp_intr,
2147         generic_done };
2148 
2149 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /*  */
2150 {
2151         int ret;
2152         int drive=DRIVE(device);
2153 
2154         LOCK_FDC(drive,1);
2155         set_floppy(device);
2156         if (!floppy ||
2157             floppy->track > DP->tracks ||
2158             tmp_format_req->track >= floppy->track ||
2159             tmp_format_req->head >= floppy->head ||
2160             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2161             !floppy->fmt_gap) {
2162                 process_fd_request();
2163                 return -EINVAL;
2164         }
2165         format_req = *tmp_format_req;
2166         format_errors = 0;
2167         cont = &format_cont;
2168         errors = &format_errors;
2169         IWAIT(redo_format);
2170         process_fd_request();
2171         return ret;
2172 }
2173 
2174 /*
2175  * Buffer read/write and support
2176  * =============================
2177  */
2178 
2179 /* new request_done. Can handle physical sectors which are smaller than a
2180  * logical buffer */
2181 static void request_done(int uptodate)
     /*  */
2182 {
2183         int block;
2184 
2185         probing = 0;
2186         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2187 
2188         if (!CURRENT){
2189                 DPRINT("request list destroyed in floppy request done\n");
2190                 return;
2191         }
2192         if (uptodate){
2193                 /* maintain values for invalidation on geometry
2194                  * change */
2195                 block = current_count_sectors + CURRENT->sector;
2196                 if (block > DRS->maxblock)
2197                         DRS->maxblock=block;
2198                 if ( block > floppy->sect)
2199                         DRS->maxtrack = 1;
2200 
2201                 /* unlock chained buffers */
2202                 while (current_count_sectors && CURRENT &&
2203                        current_count_sectors >= CURRENT->current_nr_sectors ){
2204                         current_count_sectors -= CURRENT->current_nr_sectors;
2205                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2206                         CURRENT->sector += CURRENT->current_nr_sectors;
2207                         end_request(1);
2208                 }
2209                 if ( current_count_sectors && CURRENT){
2210                         /* "unlock" last subsector */
2211                         CURRENT->buffer += current_count_sectors <<9;
2212                         CURRENT->current_nr_sectors -= current_count_sectors;
2213                         CURRENT->nr_sectors -= current_count_sectors;
2214                         CURRENT->sector += current_count_sectors;
2215                         return;
2216                 }
2217 
2218                 if ( current_count_sectors && ! CURRENT )
2219                         DPRINT("request list destroyed in floppy request done\n");
2220 
2221         } else {
2222                 if(CURRENT->cmd == WRITE) {
2223                         /* record write error information */
2224                         DRWE->write_errors++;
2225                         if(DRWE->write_errors == 1) {
2226                                 DRWE->first_error_sector = CURRENT->sector;
2227                                 DRWE->first_error_generation = DRS->generation;
2228                         }
2229                         DRWE->last_error_sector = CURRENT->sector;
2230                         DRWE->last_error_generation = DRS->generation;
2231                 }
2232                 end_request(0);
2233         }
2234 }
2235 
2236 /* Interrupt handler evaluating the result of the r/w operation */
2237 static void rw_interrupt(void)
     /*  */
2238 {
2239         int nr_sectors, ssize;
2240 
2241         if ( ! DRS->first_read_date )
2242                 DRS->first_read_date = jiffies;
2243 
2244         nr_sectors = 0;
2245         CODE2SIZE;
2246         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2247                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2248                 (sector_t % floppy->sect) % ssize;
2249 
2250 #ifdef CONFIG_FLOPPY_SANITY
2251         if ( nr_sectors > current_count_sectors + ssize -
2252              (current_count_sectors + sector_t) % ssize +
2253              sector_t % ssize){
2254                 DPRINT2("long rw: %x instead of %lx\n",
2255                         nr_sectors, current_count_sectors);
2256                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2257                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2258                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2259                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2260                        sector_t, ssize);
2261         }
2262 #endif
2263         if ( nr_sectors < 0 )
2264                 nr_sectors = 0;
2265         if ( nr_sectors < current_count_sectors )
2266                 current_count_sectors = nr_sectors;
2267 
2268         switch (interpret_errors()){
2269                 case 2:
2270                         cont->redo();
2271                         return;
2272                 case 1:
2273                         if (  !current_count_sectors){
2274                                 cont->error();
2275                                 cont->redo();
2276                                 return;
2277                         }
2278                         break;
2279                 case 0:
2280                         if (  !current_count_sectors){
2281                                 cont->redo();
2282                                 return;
2283                         }
2284                         current_type[current_drive] = floppy;
2285                         floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
2286                         break;
2287         }
2288 
2289         if (probing) {
2290                 if (DP->flags & FTD_MSG)
2291                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2292                                 floppy->name,current_drive);
2293                 current_type[current_drive] = floppy;
2294                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2295                 probing = 0;
2296         }
2297 
2298         if ( CT(COMMAND) != FD_READ || 
2299              raw_cmd->kernel_data == CURRENT->buffer ){
2300                 /* transfer directly from buffer */
2301                 cont->done(1);
2302         } else if ( CT(COMMAND) == FD_READ){
2303                 buffer_track = raw_cmd->track;
2304                 buffer_drive = current_drive;
2305                 if ( nr_sectors + sector_t > buffer_max )
2306                         buffer_max = nr_sectors + sector_t;
2307         }
2308         cont->redo();
2309 }
2310 
2311 /* Compute maximal contiguous buffer size. */
2312 static int buffer_chain_size(void)
     /*  */
2313 {
2314         struct buffer_head *bh;
2315         int size;
2316         char *base;
2317 
2318         base = CURRENT->buffer;
2319         size = CURRENT->current_nr_sectors << 9;
2320         bh = CURRENT->bh;
2321 
2322         if (bh){
2323                 bh = bh->b_reqnext;
2324                 while ( bh && bh->b_data == base + size ){
2325                         size += bh->b_size;
2326                         bh = bh->b_reqnext;
2327                 }
2328         }
2329         return size >> 9;
2330 }
2331 
2332 /* Compute the maximal transfer size */
2333 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2334 {
2335         if ( max_sector > sector_t + max_size)
2336                 max_sector = sector_t + max_size;
2337 
2338         /* alignment */
2339         max_sector -= (max_sector % floppy->sect ) % ssize;
2340 
2341         /* transfer size, beginning not aligned */
2342         current_count_sectors = max_sector - sector_t ;
2343 
2344         return max_sector;
2345 }
2346 
2347 /*
2348  * Move data from/to the track buffer to/from the buffer cache.
2349  */
2350 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2351 {
2352         int remaining; /* number of transferred 512-byte sectors */
2353         struct buffer_head *bh;
2354         char *buffer, *dma_buffer;
2355         int size;
2356 
2357         if ( max_sector > max_sector_2 )
2358                 max_sector = max_sector_2;
2359 
2360         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2361 
2362         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2363             buffer_max > sector_t + CURRENT->nr_sectors){
2364                 current_count_sectors = buffer_max - sector_t;
2365                 if ( current_count_sectors > CURRENT->nr_sectors )
2366                         current_count_sectors = CURRENT->nr_sectors;
2367         }
2368         remaining = current_count_sectors << 9;
2369 #ifdef CONFIG_FLOPPY_SANITY
2370         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2371             CT(COMMAND) == FD_WRITE ){
2372                 DPRINT("in copy buffer\n");
2373                 printk("current_count_sectors=%ld\n", current_count_sectors);
2374                 printk("remaining=%d\n", remaining >> 9);
2375                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2376                 printk("CURRENT->current_nr_sectors=%ld\n",
2377                        CURRENT->current_nr_sectors);
2378                 printk("max_sector=%d\n", max_sector);
2379                 printk("ssize=%d\n", ssize);
2380         }
2381 #endif
2382 
2383         if ( max_sector > buffer_max )
2384                 buffer_max = max_sector;
2385 
2386         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2387 
2388         bh = CURRENT->bh;
2389         size = CURRENT->current_nr_sectors << 9;
2390         buffer = CURRENT->buffer;
2391 
2392         while ( remaining > 0){
2393                 if ( size > remaining )
2394                         size = remaining;
2395 #ifdef CONFIG_FLOPPY_SANITY
2396                 if (dma_buffer + size >
2397                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2398                     dma_buffer < floppy_track_buffer ){
2399                         DPRINT1("buffer overrun in copy buffer %d\n",
2400                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2401                         printk("sector_t=%d buffer_min=%d\n",
2402                                sector_t, buffer_min);
2403                         printk("current_count_sectors=%ld\n",
2404                                current_count_sectors);
2405                         if ( CT(COMMAND) == FD_READ )
2406                                 printk("read\n");
2407                         if ( CT(COMMAND) == FD_READ )
2408                                 printk("write\n");
2409                         break;
2410                 }
2411                 if ( ((unsigned long)buffer) % 512 )
2412                         DPRINT1("%p buffer not aligned\n", buffer);
2413 #endif
2414                 if ( CT(COMMAND) == FD_READ )
2415                         memcpy( buffer, dma_buffer, size);
2416                 else
2417                         memcpy( dma_buffer, buffer, size);
2418                 remaining -= size;
2419                 if ( !remaining)
2420                         break;
2421 
2422                 dma_buffer += size;
2423                 bh = bh->b_reqnext;
2424 #ifdef CONFIG_FLOPPY_SANITY
2425                 if ( !bh){
2426                         DPRINT("bh=null in copy buffer after copy\n");
2427                         break;
2428                 }
2429 #endif
2430                 size = bh->b_size;
2431                 buffer = bh->b_data;
2432         }
2433 #ifdef CONFIG_FLOPPY_SANITY
2434         if ( remaining ){
2435                 if ( remaining > 0 )
2436                         max_sector -= remaining >> 9;
2437                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2438         }
2439 #endif
2440 }
2441 
2442 /*
2443  * Formulate a read/write request.
2444  * this routine decides where to load the data (directly to buffer, or to
2445  * tmp floppy area), how much data to load (the size of the buffer, the whole
2446  * track, or a single sector)
2447  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2448  * allocation on the fly, it should be done here. No other part should need
2449  * modification.
2450  */
2451 
2452 static int make_raw_rw_request(void)
     /*  */
2453 {
2454         int aligned_sector_t;
2455         int max_sector, max_size, tracksize, ssize;
2456 
2457         set_fdc(DRIVE(CURRENT->rq_dev));
2458 
2459         raw_cmd = &default_raw_cmd;
2460         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2461                 FD_RAW_NEED_SEEK;
2462         raw_cmd->cmd_count = NR_RW;
2463         if (CURRENT->cmd == READ){
2464                 raw_cmd->flags |= FD_RAW_READ;
2465                 COMMAND = FM_MODE(floppy,FD_READ);
2466         } else if (CURRENT->cmd == WRITE){
2467                 raw_cmd->flags |= FD_RAW_WRITE;
2468                 COMMAND = FM_MODE(floppy,FD_WRITE);
2469         } else {
2470                 DPRINT("make_raw_rw_request: unknown command\n");
2471                 return 0;
2472         }
2473 
2474         max_sector = floppy->sect * floppy->head;
2475 
2476         TRACK = CURRENT->sector / max_sector;
2477         sector_t = CURRENT->sector % max_sector;
2478         if ( floppy->track && TRACK >= floppy->track )
2479                 return 0;
2480         HEAD = sector_t / floppy->sect;
2481 
2482         if (((floppy->stretch & FD_SWAPSIDES) || TESTF( FD_NEED_TWADDLE)) &&
2483             sector_t < floppy->sect )
2484                 max_sector = floppy->sect;
2485 
2486         /* 2M disks have phantom sectors on the first track */
2487         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2488                 max_sector = 2 * floppy->sect / 3;
2489                 if (sector_t >= max_sector){
2490                         current_count_sectors =  (floppy->sect - sector_t);
2491                         if ( current_count_sectors > CURRENT->nr_sectors )
2492                                 current_count_sectors = CURRENT->nr_sectors;
2493                         return 1;
2494                 }
2495                 SIZECODE = 2;
2496         } else
2497                 SIZECODE = FD_SIZECODE(floppy);
2498         raw_cmd->rate = floppy->rate & 3;
2499         if ((floppy->rate & FD_2M) &&
2500             (TRACK || HEAD ) &&
2501             raw_cmd->rate == 2)
2502                 raw_cmd->rate = 1;
2503 
2504         if ( SIZECODE )
2505                 SIZECODE2 = 0xff;
2506         else
2507                 SIZECODE2 = 0x80;
2508         raw_cmd->track = TRACK << STRETCH(floppy);
2509         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2510         GAP = floppy->gap;
2511         CODE2SIZE;
2512         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2513         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2514         tracksize = floppy->sect - floppy->sect % ssize;
2515         if ( tracksize < floppy->sect ){
2516                 SECT_PER_TRACK ++;
2517                 if (  tracksize <= sector_t % floppy->sect)
2518                         SECTOR--;
2519                 while ( tracksize <= sector_t % floppy->sect){
2520                         while( tracksize + ssize > floppy->sect ){
2521                                 SIZECODE--;
2522                                 ssize >>= 1;
2523                         }
2524                         SECTOR++; SECT_PER_TRACK ++;
2525                         tracksize += ssize;
2526                 }
2527                 max_sector = HEAD * floppy->sect + tracksize;
2528         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2529                 max_sector = floppy->sect;
2530 
2531         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2532         max_size = CURRENT->nr_sectors;
2533         if ((raw_cmd->track == buffer_track) && (current_drive == buffer_drive) &&
2534             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2535                 /* data already in track buffer */
2536                 if (CT(COMMAND) == FD_READ) {
2537                         copy_buffer(1, max_sector, buffer_max);
2538                         return 1;
2539                 }
2540         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2541                 if (CT(COMMAND) == FD_WRITE){
2542                         if(sector_t + CURRENT->nr_sectors > ssize &&
2543                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2544                                 max_size = ssize + ssize;
2545                         else
2546                                 max_size = ssize;
2547                 }
2548                 raw_cmd->flags &= ~FD_RAW_WRITE;
2549                 raw_cmd->flags |= FD_RAW_READ;
2550                 COMMAND = FM_MODE(floppy,FD_READ);
2551         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS ) {
2552                 int direct, indirect;
2553 
2554                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2555                         sector_t;
2556 
2557                 max_size = buffer_chain_size();
2558                 if ( max_size > ( MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9)
2559                         max_size=(MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9;
2560                 /* 64 kb boundaries */
2561                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2562                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2563                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2564                 /*
2565                  * We try to read tracks, but if we get too many errors, we
2566                  * go back to reading just one sector at a time.
2567                  *
2568                  * This means we should be able to read a sector even if there
2569                  * are other bad sectors on this track.
2570                  */
2571                 if (!direct ||
2572                     (indirect * 2 > direct * 3 &&
2573                      *errors < DP->max_errors.read_track &&
2574                      /*!TESTF( FD_NEED_TWADDLE) &&*/
2575                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2576                         max_size = CURRENT->nr_sectors;
2577                 } else {
2578                         raw_cmd->kernel_data = CURRENT->buffer;
2579                         raw_cmd->length = current_count_sectors << 9;
2580                         if (raw_cmd->length == 0){
2581                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2582                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2583                                         indirect, direct, sector_t);
2584                                 return 0;
2585                         }
2586                         return 2;
2587                 }
2588         }
2589 
2590         if ( CT(COMMAND) == FD_READ )
2591                 max_size = max_sector; /* unbounded */
2592 
2593         /* claim buffer track if needed */
2594         if (buffer_track != raw_cmd->track ||  /* bad track */
2595             buffer_drive !=current_drive || /* bad drive */
2596             sector_t > buffer_max ||
2597             sector_t < buffer_min ||
2598             ((CT(COMMAND) == FD_READ ||
2599               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2600              max_sector > 2 * max_buffer_sectors + buffer_min &&
2601              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2602             /* not enough space */ ){
2603                 buffer_track = -1;
2604                 buffer_drive = current_drive;
2605                 buffer_max = buffer_min = aligned_sector_t;
2606         }
2607         raw_cmd->kernel_data = floppy_track_buffer + 
2608                 ((aligned_sector_t-buffer_min )<<9);
2609 
2610         if ( CT(COMMAND) == FD_WRITE ){
2611                 /* copy write buffer to track buffer.
2612                  * if we get here, we know that the write
2613                  * is either aligned or the data already in the buffer
2614                  * (buffer will be overwritten) */
2615 #ifdef CONFIG_FLOPPY_SANITY
2616                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2617                         DPRINT("internal error offset !=0 on write\n");
2618 #endif
2619                 buffer_track = raw_cmd->track;
2620                 buffer_drive = current_drive;
2621                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2622         } else
2623                 transfer_size(ssize, max_sector,
2624                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2625 
2626         /* round up current_count_sectors to get dma xfer size */
2627         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2628         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2629         raw_cmd->length <<= 9;
2630 #ifdef CONFIG_FLOPPY_SANITY
2631         if ((raw_cmd->length < current_count_sectors << 9) ||
2632             (raw_cmd->kernel_data != CURRENT->buffer &&
2633              CT(COMMAND) == FD_WRITE &&
2634              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2635               aligned_sector_t < buffer_min )) ||
2636             raw_cmd->length % ( 128 << SIZECODE ) ||
2637             raw_cmd->length <= 0 || current_count_sectors <= 0){
2638                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2639                         raw_cmd->length, current_count_sectors);
2640                 if ( raw_cmd->kernel_data != CURRENT->buffer )
2641                         printk("addr=%d, length=%ld\n",
2642                                (int) ((raw_cmd->kernel_data - 
2643                                        floppy_track_buffer ) >> 9),
2644                                current_count_sectors);
2645                 printk("st=%d ast=%d mse=%d msi=%d\n",
2646                        sector_t, aligned_sector_t, max_sector, max_size);
2647                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2648                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2649                        COMMAND, SECTOR, HEAD, TRACK);
2650                 printk("buffer drive=%d\n", buffer_drive);
2651                 printk("buffer track=%d\n", buffer_track);
2652                 printk("buffer_min=%d\n", buffer_min );
2653                 printk("buffer_max=%d\n", buffer_max );
2654                 return 0;
2655         }
2656 
2657         if (raw_cmd->kernel_data != CURRENT->buffer ){
2658                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2659                     current_count_sectors < 0 ||
2660                     raw_cmd->length < 0 ||
2661                     raw_cmd->kernel_data + raw_cmd->length >
2662                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2663                         DPRINT("buffer overrun in schedule dma\n");
2664                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2665                                sector_t, buffer_min,
2666                                raw_cmd->length >> 9 );
2667                         printk("current_count_sectors=%ld\n",
2668                                current_count_sectors);
2669                         if ( CT(COMMAND) == FD_READ )
2670                                 printk("read\n");
2671                         if ( CT(COMMAND) == FD_READ )
2672                                 printk("write\n");
2673                         return 0;
2674                 }
2675         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2676                    current_count_sectors > CURRENT->nr_sectors){
2677                 DPRINT("buffer overrun in direct transfer\n");
2678                 return 0;
2679         } else if ( raw_cmd->length < current_count_sectors << 9 ){
2680                 DPRINT("more sectors than bytes\n");
2681                 printk("bytes=%ld\n", raw_cmd->length >> 9 );
2682                 printk("sectors=%ld\n", current_count_sectors);
2683         }
2684         if (raw_cmd->length == 0){
2685                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2686                 return 0;
2687         }
2688 #endif
2689         return 2;
2690 }
2691 
2692 static void redo_fd_request(void)
     /*  */
2693 {
2694 #define REPEAT {request_done(0); continue; }
2695         kdev_t device;
2696         int tmp;
2697 
2698         lastredo = jiffies;
2699         if (current_drive < N_DRIVE)
2700                 floppy_off(current_drive);
2701 
2702         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2703                 DPRINT("current not active!\n");
2704                 return;
2705         }
2706 
2707         while(1){
2708                 if (!CURRENT) {
2709                         CLEAR_INTR;
2710                         unlock_fdc();
2711                         return;
2712                 }
2713                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2714                         panic(DEVICE_NAME ": request list destroyed");
2715                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2716                         panic(DEVICE_NAME ": block not locked");
2717 
2718                 device = CURRENT->rq_dev;
2719                 set_fdc(DRIVE(device));
2720                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2721 
2722                 set_floppy(device);
2723                 raw_cmd = & default_raw_cmd;
2724                 raw_cmd->flags = 0;
2725                 if(start_motor(redo_fd_request)) return;
2726                 if(test_bit(current_drive, &fake_change) ||
2727                    TESTF(FD_DISK_CHANGED)){
2728                         DPRINT("disk absent or changed during operation\n");
2729                         REPEAT;
2730                 }
2731                 if (!floppy) { /* Autodetection */
2732                         if (!probing){
2733                                 DRS->probed_format = 0;
2734                                 if ( next_valid_format() ){
2735                                         DPRINT("no autodetectable formats\n");
2736                                         floppy = NULL;
2737                                         REPEAT;
2738                                 }
2739                         }
2740                         probing = 1;
2741                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2742                 } else
2743                         probing = 0;
2744                 errors = & (CURRENT->errors);
2745                 tmp = make_raw_rw_request();
2746                 if ( tmp < 2 ){
2747                         request_done(tmp);
2748                         continue;
2749                 }
2750 
2751                 if (TESTF(FD_NEED_TWADDLE))
2752                         twaddle();
2753                 floppy_tq.routine = (void *)(void *) floppy_start;
2754                 queue_task(&floppy_tq, &tq_timer);
2755 #ifdef DEBUGT
2756                 debugt("queue fd request");
2757 #endif
2758                 return;
2759         }
2760 #undef REPEAT
2761 }
2762 
2763 static struct cont_t rw_cont={
2764         rw_interrupt,
2765         redo_fd_request,
2766         bad_flp_intr,
2767         request_done };
2768 
2769 struct tq_struct request_tq =
2770 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2771 
2772 static void process_fd_request(void)
     /*  */
2773 {
2774         cont = &rw_cont;
2775         queue_task(&request_tq, &tq_timer);
2776 }
2777 
2778 static void do_fd_request(void)
     /*  */
2779 {
2780         if (fdc_busy){
2781                 /* fdc busy, this new request will be treated when the
2782                    current one is done */
2783                 is_alive("do fd request, old request running");
2784                 return;
2785         }
2786         /* fdc_busy cannot be set by an interrupt or a bh */
2787         floppy_grab_irq_and_dma();
2788         fdc_busy=1;
2789         reschedule_timeout(MAXTIMEOUT, "do fd request",0);
2790         process_fd_request();
2791         is_alive("do fd request");
2792 }
2793 
2794 static struct cont_t poll_cont={
2795         success_and_wakeup,
2796         floppy_ready,
2797         generic_failure,
2798         generic_done };
2799 
2800 static int poll_drive(int interruptible, int flag)
     /*  */
2801 {
2802         int ret;
2803         /* no auto-sense, just clear dcl */
2804         raw_cmd = &default_raw_cmd;
2805         raw_cmd->flags= flag;
2806         raw_cmd->track=0;
2807         raw_cmd->cmd_count=0;
2808         cont = &poll_cont;
2809 #ifdef DCL_DEBUG
2810         if (DP->flags & FD_DEBUG){
2811                 DPRINT("setting NEWCHANGE in poll_drive\n");
2812         }
2813 #endif
2814         SETF(FD_DISK_NEWCHANGE);
2815         WAIT(floppy_ready);
2816         return ret;
2817 }
2818 
2819 /*
2820  * User triggered reset
2821  * ====================
2822  */
2823 
2824 static void reset_intr(void)
     /*  */
2825 {
2826         printk("weird, reset interrupt called\n");
2827 }
2828 
2829 static struct cont_t reset_cont={
2830         reset_intr,
2831         success_and_wakeup,
2832         generic_failure,
2833         generic_done };
2834 
2835 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2836 {
2837         int ret;
2838 
2839         ret=0;
2840         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2841                 return 0;
2842         LOCK_FDC(drive,interruptible);
2843         if(arg == FD_RESET_ALWAYS)
2844                 FDCS->reset=1;
2845         if ( FDCS->reset ){
2846                 cont = &reset_cont;
2847                 reschedule_timeout(CURRENTD, "user reset fdc", 0);
2848                 WAIT(reset_fdc);
2849         }
2850         process_fd_request();
2851         return ret;
2852 }
2853 
2854 /*
2855  * Misc Ioctl's and support
2856  * ========================
2857  */
2858 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2859 {
2860         int i;
2861 
2862         i = verify_area(VERIFY_WRITE,param,size);
2863         if (i)
2864                 return i;
2865         memcpy_tofs(param,(void *) address, size);
2866         return 0;
2867 }
2868 
2869 static int fd_copyin(void *param, volatile void *address, int size)
     /*  */
2870 {
2871         int i;
2872 
2873         i = verify_area(VERIFY_READ,param,size);
2874         if (i)
2875                 return i;
2876         memcpy_fromfs((void *) address, param, size);
2877         return 0;
2878 }
2879 
2880 #define COPYOUT(x) ECALL(fd_copyout( (void *)param, &(x), sizeof(x)))
2881 #define COPYIN(x) ECALL(fd_copyin( (void *)param, &(x), sizeof(x)))
2882 
2883 static const char *drive_name(int type, int drive )
     /*  */
2884 {
2885         struct floppy_struct *floppy;
2886 
2887         if ( type )
2888                 floppy = floppy_type + type;
2889         else {
2890                 if ( UDP->native_format )
2891                         floppy = floppy_type + UDP->native_format;
2892                 else
2893                         return "(null)";
2894         }
2895         if ( floppy->name )
2896                 return floppy->name;
2897         else
2898                 return "(null)";
2899 }
2900 
2901 
2902 /* raw commands */
2903 static void raw_cmd_done(int flag)
     /*  */
2904 {
2905         int i;
2906 
2907         if(!flag) {
2908                 raw_cmd->flags = FD_RAW_FAILURE;
2909                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2910         } else {
2911                 raw_cmd->reply_count = inr;
2912                 for( i=0; i< raw_cmd->reply_count; i++)
2913                         raw_cmd->reply[i] = reply_buffer[i];
2914 
2915                 if ( raw_cmd->flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2916                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2917                 
2918                 if( (raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2919                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2920                         raw_cmd->flags |= FD_RAW_FAILURE;
2921 
2922                 if( disk_change(current_drive) )
2923                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2924                 else
2925                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2926                 if(raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2927                         motor_off_callback(current_drive);
2928 
2929                 if(raw_cmd->next &&
2930                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2931                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2932                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2933                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2934                         raw_cmd = raw_cmd->next;
2935                         return;
2936                 }
2937         }
2938         generic_done(flag);
2939 }
2940 
2941 
2942 static struct cont_t raw_cmd_cont={
2943         success_and_wakeup,
2944         floppy_start,
2945         generic_failure,
2946         raw_cmd_done
2947 };
2948 
2949 static inline int raw_cmd_copyout(int cmd, char *param,
     /*  */
2950                                   struct floppy_raw_cmd *ptr)
2951 {
2952         struct old_floppy_raw_cmd old_raw_cmd;
2953         int ret;
2954 
2955         while(ptr) {
2956                 if(cmd == OLDFDRAWCMD) {
2957                         old_raw_cmd.flags = ptr->flags;
2958                         old_raw_cmd.data = ptr->data;
2959                         old_raw_cmd.length = ptr->length;
2960                         old_raw_cmd.rate = ptr->rate;
2961                         old_raw_cmd.reply_count = ptr->reply_count;
2962                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2963                         COPYOUT(old_raw_cmd);
2964                         param += sizeof(old_raw_cmd);
2965                 } else {
2966                         COPYOUT(*ptr);
2967                         param += sizeof(struct floppy_raw_cmd);
2968                 }
2969 
2970                 if ( (ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2971                         if(ptr->length>=0 && ptr->length<=ptr->buffer_length)
2972                                 ECALL(fd_copyout(ptr->data, 
2973                                                  ptr->kernel_data, 
2974                                                  ptr->buffer_length - 
2975                                                  ptr->length));
2976                 }
2977                 ptr = ptr->next;
2978         }
2979         return 0;
2980 }
2981 
2982 
2983 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /*  */
2984 {
2985         struct floppy_raw_cmd **next;
2986 
2987         while(*ptr) {
2988                 next = & (*ptr)->next;
2989                 if((*ptr)->buffer_length) {
2990                         free_pages((unsigned long)(*ptr)->kernel_data,
2991                                    __get_order((*ptr)->buffer_length));
2992                         (*ptr)->buffer_length = 0;
2993                 }
2994                 kfree(*ptr);
2995                 *ptr = 0;
2996                 ptr = next;
2997         }
2998 }
2999 
3000 
3001 static inline int raw_cmd_copyin(int cmd, char *param,
     /*  */
3002                                  struct floppy_raw_cmd **rcmd)
3003 {
3004         struct floppy_raw_cmd *ptr;
3005         struct old_floppy_raw_cmd old_raw_cmd;
3006         int ret;
3007         int i;
3008         
3009         *rcmd = 0;
3010         while(1) {
3011                 ptr = (struct floppy_raw_cmd *) 
3012                         kmalloc(sizeof(struct floppy_raw_cmd ), GFP_USER);
3013                 if(!ptr)
3014                         return -ENOMEM;
3015                 ptr->next = 0;
3016                 ptr->buffer_length = 0;
3017                 *rcmd = ptr;
3018                 if(cmd == OLDFDRAWCMD){
3019                         COPYIN(old_raw_cmd);
3020                         ptr->flags = old_raw_cmd.flags;
3021                         ptr->data = old_raw_cmd.data;
3022                         ptr->length = old_raw_cmd.length;
3023                         ptr->rate = old_raw_cmd.rate;
3024                         ptr->cmd_count = old_raw_cmd.cmd_count;
3025                         ptr->track = old_raw_cmd.track;
3026                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
3027                         if(ptr->cmd_count > 9)
3028                                 return -EINVAL;                 
3029                         ptr->next = 0;
3030                         ptr->phys_length = 0;
3031                         param += sizeof(struct old_floppy_raw_cmd);
3032                 } else {
3033                         COPYIN(*ptr);
3034                         param += sizeof(struct floppy_raw_cmd);
3035                         if(ptr->cmd_count > 16)
3036                                 return -EINVAL;
3037                 }
3038 
3039                 for(i=0; i< 16; i++)
3040                         ptr->reply[i] = 0;
3041                 ptr->resultcode = 0;
3042 
3043                 ptr->next = 0;
3044                 ptr->buffer_length = 0;
3045                 ptr->kernel_data = 0;
3046 
3047                 if(ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3048                         if(!ptr->length)
3049                                 return -EINVAL;
3050 
3051                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
3052                         if(!ptr->kernel_data)
3053                                 return -ENOMEM;
3054                         ptr->buffer_length = ptr->length;
3055                 }
3056                 if(ptr->flags & FD_RAW_WRITE)
3057                         fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3058                 rcmd = & (ptr->next);
3059                 if( ! (ptr->flags & FD_RAW_MORE))
3060                         return 0;
3061                 ptr->rate &= 0x03;
3062 
3063         }
3064 }
3065 
3066 
3067 static int raw_cmd_ioctl(int cmd, void *param)
     /*  */
3068 {
3069         int drive, ret, ret2;
3070         struct floppy_raw_cmd *my_raw_cmd;
3071 
3072         if ( FDCS->rawcmd <= 1 )
3073                 FDCS->rawcmd = 1;
3074         for ( drive= 0; drive < N_DRIVE; drive++){
3075                 if ( FDC(drive) != fdc)
3076                         continue;
3077                 if ( drive == current_drive ){
3078                         if ( UDRS->fd_ref > 1 ){
3079                                 FDCS->rawcmd = 2;
3080                                 break;
3081                         }
3082                 } else if ( UDRS->fd_ref ){
3083                         FDCS->rawcmd = 2;
3084                         break;
3085                 }
3086         }
3087 
3088         if(FDCS->reset)
3089                 return -EIO;
3090 
3091         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3092         if(ret) {
3093                 raw_cmd_free(&my_raw_cmd);
3094                 return ret;
3095         }
3096 
3097         raw_cmd = my_raw_cmd;
3098         cont = &raw_cmd_cont;
3099         ret=wait_til_done(floppy_start,1);
3100 #ifdef DCL_DEBUG
3101         if (DP->flags & FD_DEBUG){
3102                 DPRINT("calling disk change from raw_cmd ioctl\n");
3103         }
3104 #endif
3105 
3106         if(ret != -EINTR && FDCS->reset)
3107                 ret = -EINTR;
3108 
3109         DRS->track = NO_TRACK;
3110 
3111         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3112         if(!ret)
3113                 ret = ret2;
3114         raw_cmd_free(&my_raw_cmd);
3115         return ret;
3116 }
3117 
3118 static int invalidate_drive(kdev_t rdev)
     /*  */
3119 {
3120         /* invalidate the buffer track to force a reread */
3121         set_bit( DRIVE(rdev), &fake_change);
3122         process_fd_request();
3123         check_disk_change(rdev);
3124         return 0;
3125 }
3126 
3127 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
3128                     unsigned long param)
3129 {
3130 #define IOCTL_MODE_BIT 8
3131 #define OPEN_WRITE_BIT 16
3132 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3133 
3134         struct floppy_struct newparams;
3135         struct format_descr tmp_format_req;
3136         int i,drive,type,cnt;
3137         kdev_t device;
3138         struct floppy_struct *this_floppy;
3139         const char *name;
3140         int ret;
3141 
3142         device = inode->i_rdev;
3143         switch (cmd) {
3144                 RO_IOCTLS(device,param);
3145         }
3146         type = TYPE(device);
3147         drive = DRIVE(device);
3148         switch (cmd) {
3149                 case OLDFDGETDRVTYP:
3150                 case FDGETDRVTYP:
3151                         i=verify_area(VERIFY_WRITE,(void *) param,16);
3152                         if (i)
3153                                 return i;
3154                         name = drive_name(type,drive);
3155                         for ( cnt=0; cnt<16; cnt++){
3156                                 put_user(name[cnt], ((char*)param)+cnt);
3157                                 if ( ! *name )
3158                                         break;
3159                         }
3160                         return 0;
3161                 case OLDFDGETMAXERRS:
3162                 case FDGETMAXERRS:
3163                         COPYOUT(UDP->max_errors);
3164                         return 0;
3165                 case OLDFDGETPRM:
3166                 case FDGETPRM:
3167                         if (type)
3168                                 this_floppy = &floppy_type[type];
3169                         else if ((this_floppy = current_type[drive]) == NULL)
3170                                 return -ENODEV;
3171                         COPYOUT(this_floppy[0]);
3172                         return 0;
3173                 case OLDFDPOLLDRVSTAT:
3174                 case FDPOLLDRVSTAT:
3175                         LOCK_FDC(drive,1);
3176                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3177                         process_fd_request();
3178                         /* fall through */
3179                 case OLDFDGETDRVSTAT:
3180                 case FDGETDRVSTAT:
3181                         COPYOUT(*UDRS);
3182                         return 0;
3183                 case OLDFDGETFDCSTAT:
3184                         COPYOUT(* (struct old_floppy_fdc_state *) UFDCS);
3185                         return 0;
3186                 case FDGETFDCSTAT:
3187                         COPYOUT(*UFDCS);
3188                         return 0;
3189                 case OLDFDGETDRVPRM:
3190                 case FDGETDRVPRM:
3191                         COPYOUT(*UDP);
3192                         return 0;
3193                 case OLDFDWERRORGET:
3194                 case FDWERRORGET:
3195                         COPYOUT(*UDRWE);
3196                         return 0;
3197         }
3198         if (!IOCTL_ALLOWED)
3199                 return -EPERM;
3200         switch (cmd) {
3201                 case OLDFDWERRORCLR:
3202                 case FDWERRORCLR:
3203                         UDRWE->write_errors = 0;
3204                         UDRWE->first_error_sector = 0;
3205                         UDRWE->first_error_generation = 0;
3206                         UDRWE->last_error_sector = 0;
3207                         UDRWE->last_error_generation = 0;
3208                         UDRWE->badness = 0;
3209                         return 0;
3210                 case OLDFDRAWCMD:
3211                 case FDRAWCMD:
3212                         if (type)
3213                                 return -EINVAL;
3214                         LOCK_FDC(drive,1);
3215                         set_floppy(device);
3216                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3217                         process_fd_request();
3218                         return i;
3219                 case OLDFDFMTTRK:
3220                 case FDFMTTRK:
3221                         if (UDRS->fd_ref != 1)
3222                                 return -EBUSY;
3223                         COPYIN(tmp_format_req);
3224                         return do_format(device, &tmp_format_req);
3225                 case OLDFDSETMAXERRS:
3226                 case FDSETMAXERRS:
3227                         COPYIN(UDP->max_errors);
3228                         return 0;
3229                 case OLDFDFMTBEG:
3230                 case FDFMTBEG:
3231                         return 0;
3232                 case OLDFDCLRPRM:
3233                 case FDCLRPRM:
3234                         LOCK_FDC(drive,1);
3235                         current_type[drive] = NULL;
3236                         floppy_sizes[drive] = MAX_DISK_SIZE;
3237                         UDRS->keep_data = 0;
3238                         return invalidate_drive(device);
3239                 case OLDFDFMTEND:
3240                 case FDFMTEND:
3241                 case OLDFDFLUSH:
3242                 case FDFLUSH:
3243                         LOCK_FDC(drive,1);
3244                         return invalidate_drive(device);
3245                 case OLDFDSETPRM:
3246                 case FDSETPRM:
3247                 case OLDFDDEFPRM:
3248                 case FDDEFPRM:
3249                         COPYIN(newparams);
3250                         /* sanity checking for parameters.*/
3251                         if(newparams.sect <= 0 ||
3252                            newparams.head <= 0 ||
3253                            newparams.track <= 0 ||
3254                            newparams.track > UDP->tracks>> STRETCH(&newparams) ||
3255                            /* check if reserved bits are set */
3256                            (newparams.stretch & ~(FD_STRETCH | FD_SWAPSIDES)) != 0)
3257                                 return -EINVAL;
3258                         if ( type){
3259                                 if ( !suser() )
3260                                         return -EPERM;
3261                                 LOCK_FDC(drive,1);
3262                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3263                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3264                                             drive_state[cnt].fd_ref)
3265                                                 set_bit(drive, &fake_change);
3266                                 }
3267                                 floppy_type[type] = newparams;
3268                                 floppy_type[type].name="user format";
3269                                 for (cnt = type << 2 ;
3270                                      cnt < (type << 2 ) + 4 ;
3271                                      cnt++)
3272                                         floppy_sizes[cnt]=
3273                                                 floppy_sizes[cnt+0x80]=
3274                                                 floppy_type[type].size>>1;
3275                                 process_fd_request();
3276                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3277                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3278                                             drive_state[cnt].fd_ref)
3279                                                 check_disk_change(drive_state[cnt].
3280                                                                   fd_device);
3281                                 }
3282                                 return 0;
3283                         }
3284 
3285                         LOCK_FDC(drive,1);
3286                         if ( cmd != FDDEFPRM )
3287                                 /* notice a disk change immediately, else
3288                                  * we loose our settings immediately*/
3289                                 CALL(poll_drive(1,0));
3290                         user_params[drive] = newparams;
3291                         if (buffer_drive == drive &&
3292                             buffer_max > user_params[drive].sect)
3293                                 buffer_max=user_params[drive].sect;
3294                         current_type[drive] = &user_params[drive];
3295                         floppy_sizes[drive] = user_params[drive].size >> 1;
3296                         if (cmd == FDDEFPRM)
3297                                 DRS->keep_data = -1;
3298                         else
3299                                 DRS->keep_data = 1;
3300                         /* invalidation. Invalidate only when needed, i.e.
3301                          * when there are already sectors in the buffer cache
3302                          * whose number will change. This is useful, because
3303                          * mtools often changes the geometry of the disk after
3304                          * looking at the boot block */
3305                         if (DRS->maxblock >
3306                             user_params[drive].sect ||
3307                             DRS->maxtrack )
3308                                 invalidate_drive(device);
3309                         else
3310                                 process_fd_request();
3311                         return 0;
3312                 case OLDFDRESET:
3313                 case FDRESET:
3314                         return user_reset_fdc( drive, (int)param, 1);
3315                 case OLDFDMSGON:
3316                 case FDMSGON:
3317                         UDP->flags |= FTD_MSG;
3318                         return 0;
3319                 case OLDFDMSGOFF:
3320                 case FDMSGOFF:
3321                         UDP->flags &= ~FTD_MSG;
3322                         return 0;
3323                 case OLDFDSETEMSGTRESH:
3324                 case FDSETEMSGTRESH:
3325                         UDP->max_errors.reporting =
3326                         (unsigned short) (param & 0x0f);
3327                         return 0;
3328                 case OLDFDTWADDLE:
3329                 case FDTWADDLE:
3330                         LOCK_FDC(drive,1);
3331                         twaddle();
3332                         process_fd_request();
3333         }
3334         if ( ! suser() )
3335                 return -EPERM;
3336         switch(cmd){
3337                 case OLDFDSETDRVPRM:
3338                 case FDSETDRVPRM:
3339                         COPYIN(*UDP);
3340                         return 0;
3341                 default:
3342                         return -EINVAL;
3343         }
3344         return 0;
3345 #undef IOCTL_ALLOWED
3346 }
3347 
3348 static void config_types(void)
     /*  */
3349 {
3350         int first=1;
3351         int drive;
3352 
3353         /* read drive info out of physical cmos */
3354         drive=0;
3355         if (!UDP->cmos )
3356                 UDP->cmos= FLOPPY0_TYPE;
3357         drive=1;
3358         if (!UDP->cmos && FLOPPY1_TYPE)
3359                 UDP->cmos = FLOPPY1_TYPE;
3360 
3361         /* XXX */
3362         /* additional physical CMOS drive detection should go here */
3363 
3364         for (drive=0; drive < N_DRIVE; drive++){
3365                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3366                         memcpy((char *) UDP,
3367                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3368                                sizeof(struct floppy_drive_params));
3369                 if (UDP->cmos){
3370                         if (first)
3371                                 printk("Floppy drive(s): ");
3372                         else
3373                                 printk(", ");
3374                         first=0;
3375                         if (UDP->cmos > 0 ){
3376                                 ALLOWED_DRIVE_MASK |= 1 << drive;
3377                                 printk("fd%d is %s", drive,
3378                                        default_drive_params[(int)UDP->cmos].name);
3379                         } else
3380                                 printk("fd%d is unknown type %d",drive,
3381                                        UDP->cmos);
3382                 }
3383         }
3384         if(!first)
3385                 printk("\n");
3386 }
3387 
3388 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
3389                        char * buf, int count)
3390 {
3391         int drive = DRIVE(inode->i_rdev);
3392 
3393         check_disk_change(inode->i_rdev);
3394         if (UTESTF(FD_DISK_CHANGED))
3395                 return -ENXIO;
3396         return block_read(inode, filp, buf, count);
3397 }
3398 
3399 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
3400                         const char * buf, int count)
3401 {
3402         int block;
3403         int ret;
3404         int drive = DRIVE(inode->i_rdev);
3405 
3406         if(!UDRS->maxblock)
3407                 UDRS->maxblock=1;/* make change detectable */
3408         check_disk_change(inode->i_rdev);
3409         if (UTESTF(FD_DISK_CHANGED))
3410                 return -ENXIO;
3411         if(!UTESTF(FD_DISK_WRITABLE))
3412                 return -EROFS;
3413         block = (filp->f_pos + count) >> 9;
3414         if(block > UDRS->maxblock)
3415                 UDRS->maxblock = block;
3416         ret= block_write(inode, filp, buf, count);
3417         return ret;
3418 }
3419 
3420 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
3421 {
3422         int drive;
3423 
3424         drive = DRIVE(inode->i_rdev);
3425 
3426         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3427                 /* if the file is mounted OR (writable now AND writable at
3428                  * open time) Linus: Does this cover all cases? */
3429                 block_fsync(inode,filp);
3430 
3431         if (UDRS->fd_ref < 0)
3432                 UDRS->fd_ref=0;
3433         else if (!UDRS->fd_ref--) {
3434                 DPRINT("floppy_release with fd_ref == 0");
3435                 UDRS->fd_ref = 0;
3436         }
3437         floppy_release_irq_and_dma();
3438 }
3439 
3440 /*
3441  * floppy_open check for aliasing (/dev/fd0 can be the same as
3442  * /dev/PS0 etc), and disallows simultaneous access to the same
3443  * drive with different device numbers.
3444  */
3445 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3446 
3447 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
3448 {
3449         int drive;
3450         int old_dev;
3451         int try;
3452         char *tmp;
3453 
3454         if (!filp) {
3455                 DPRINT("Weird, open called with filp=0\n");
3456                 return -EIO;
3457         }
3458 
3459         drive = DRIVE(inode->i_rdev);
3460 
3461         if (drive >= N_DRIVE ||
3462             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3463             fdc_state[FDC(drive)].version == FDC_NONE)
3464                 return -ENXIO;
3465 
3466         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3467                 return -ENXIO;
3468         old_dev = UDRS->fd_device;
3469         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3470                 return -EBUSY;
3471 
3472         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3473                 USETF(FD_DISK_CHANGED);
3474                 USETF(FD_VERIFY);
3475         }
3476 
3477         if(UDRS->fd_ref == -1 ||
3478            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3479                 return -EBUSY;
3480 
3481         if (floppy_grab_irq_and_dma())
3482                 return -EBUSY;
3483 
3484         if (filp->f_flags & O_EXCL)
3485                 UDRS->fd_ref = -1;
3486         else
3487                 UDRS->fd_ref++;
3488 
3489         if (!floppy_track_buffer){
3490                 /* if opening an ED drive, reserve a big buffer,
3491                  * else reserve a small one */
3492                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3493                         try = 64; /* Only 48 actually useful */
3494                 else
3495                         try = 32; /* Only 24 actually useful */
3496 
3497                 tmp=(char *)dma_mem_alloc(1024 * try);
3498                 if (!tmp) {
3499                         try >>= 1; /* buffer only one side */
3500                         if (try < 16)
3501                                 try=16;
3502                         tmp= (char *)dma_mem_alloc(1024*try);
3503                 }
3504                 if (!tmp) {
3505                         DPRINT("Unable to allocate DMA memory\n");
3506                         RETERR(ENXIO);
3507                 }
3508                 if (floppy_track_buffer){
3509                         free_pages((unsigned long)tmp,__get_order(try*1024));
3510                 }else {
3511                         floppy_track_buffer = tmp;
3512                         max_buffer_sectors = try;
3513                 }
3514         }
3515 
3516         UDRS->fd_device = MINOR(inode->i_rdev);
3517 
3518         if (old_dev && old_dev != inode->i_rdev) {
3519                 if (buffer_drive == drive)
3520                         buffer_track = -1;
3521                 invalidate_buffers(old_dev);
3522         }
3523 
3524         /* Allow ioctls if we have write-permissions even if read-only open */
3525         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3526                 filp->f_mode |= IOCTL_MODE_BIT;
3527         if (filp->f_mode & 2)
3528                 filp->f_mode |= OPEN_WRITE_BIT;
3529 
3530         if (UFDCS->rawcmd == 1)
3531                 UFDCS->rawcmd = 2;
3532 
3533         if (filp->f_flags & O_NDELAY)
3534                 return 0;
3535         if (filp->f_mode & 3) {
3536                 UDRS->last_checked = 0;
3537                 check_disk_change(inode->i_rdev);
3538                 if (UTESTF(FD_DISK_CHANGED))
3539                         RETERR(ENXIO);
3540         }
3541         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3542                 RETERR(EROFS);
3543         return 0;
3544 #undef RETERR
3545 }
3546 
3547 /*
3548  * Check if the disk has been changed or if a change has been faked.
3549  */
3550 static int check_floppy_change(kdev_t dev)
     /*  */
3551 {
3552         int drive = DRIVE( dev );
3553 
3554         if (MAJOR(dev) != MAJOR_NR) {
3555                 DPRINT("floppy_changed: not a floppy\n");
3556                 return 0;
3557         }
3558 
3559         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3560                 return 1;
3561 
3562         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3563                 lock_fdc(drive,0);
3564                 poll_drive(0,0);
3565                 process_fd_request();
3566         }
3567 
3568         if(UTESTF(FD_DISK_CHANGED) ||
3569            UTESTF(FD_VERIFY) ||
3570            test_bit(drive, &fake_change) ||
3571            (!TYPE(dev) && !current_type[drive]))
3572                 return 1;
3573         return 0;
3574 }
3575 
3576 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3577  * the bootblock (block 0). "Autodetection" is also needed to check whether
3578  * there is a disk in the drive at all... Thus we also do it for fixed
3579  * geometry formats */
3580 static int floppy_revalidate(kdev_t dev)
     /*  */
3581 {
3582 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3583         struct buffer_head * bh;
3584         int drive=DRIVE(dev);
3585         int cf;
3586 
3587         if(UTESTF(FD_DISK_CHANGED) ||
3588            UTESTF(FD_VERIFY) ||
3589            test_bit(drive, &fake_change) ||
3590            NO_GEOM){
3591                 lock_fdc(drive,0);
3592                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3593                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3594                         process_fd_request(); /*already done by another thread*/
3595                         return 0;
3596                 }
3597                 UDRS->maxblock = 0;
3598                 UDRS->maxtrack = 0;
3599                 if ( buffer_drive == drive)
3600                         buffer_track = -1;
3601                 clear_bit(drive, &fake_change);
3602                 UCLEARF(FD_DISK_CHANGED);
3603                 if(cf)
3604                         UDRS->generation++;
3605                 if(NO_GEOM){
3606                         /* auto-sensing */
3607                         int size = floppy_blocksizes[MINOR(dev)];
3608                         if (!size)
3609                                 size = 1024;
3610                         if (!(bh = getblk(dev,0,size))){
3611                                 process_fd_request();
3612                                 return 1;
3613                         }
3614                         if ( bh && ! bh->b_uptodate)
3615                                 ll_rw_block(READ, 1, &bh);
3616                         process_fd_request();
3617                         wait_on_buffer(bh);
3618                         brelse(bh);
3619                         return 0;
3620                 }
3621                 if(cf)
3622                         poll_drive(0, FD_RAW_NEED_DISK);
3623                 process_fd_request();
3624         }
3625         return 0;
3626 }
3627 
3628 static struct file_operations floppy_fops = {
3629         NULL,                   /* lseek - default */
3630         floppy_read,            /* read - general block-dev read */
3631         floppy_write,           /* write - general block-dev write */
3632         NULL,                   /* readdir - bad */
3633         NULL,                   /* select */
3634         fd_ioctl,               /* ioctl */
3635         NULL,                   /* mmap */
3636         floppy_open,            /* open */
3637         floppy_release,         /* release */
3638         block_fsync,            /* fsync */
3639         NULL,                   /* fasync */
3640         check_floppy_change,    /* media_change */
3641         floppy_revalidate,      /* revalidate */
3642 };
3643 
3644 /*
3645  * Floppy Driver initialisation
3646  * =============================
3647  */
3648 
3649 /* Determine the floppy disk controller type */
3650 /* This routine was written by David C. Niemi */
3651 static char get_fdc_version(void)
     /*  */
3652 {
3653         int r;
3654 
3655         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3656         if ( FDCS->reset )
3657                 return FDC_NONE;
3658         if ( (r = result()) <= 0x00)
3659                 return FDC_NONE;        /* No FDC present ??? */
3660         if ((r==1) && (reply_buffer[0] == 0x80)){
3661                 printk("FDC %d is a 8272A\n",fdc);
3662                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3663         }
3664         if (r != 10) {
3665                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3666                 return FDC_UNKNOWN;
3667         }
3668         output_byte(FD_VERSION);
3669         r = result();
3670         if ((r == 1) && (reply_buffer[0] == 0x80)){
3671                 printk("FDC %d is a 82072\n",fdc);
3672                 return FDC_82072;               /* 82072 doesn't know VERSION */
3673         }
3674         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3675                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3676                 return FDC_UNKNOWN;
3677         }
3678         output_byte(FD_UNLOCK);
3679         r = result();
3680         if ((r == 1) && (reply_buffer[0] == 0x80)){
3681                 printk("FDC %d is a pre-1991 82077\n", fdc);
3682                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3683         }
3684         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3685                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3686                 return FDC_UNKNOWN;
3687         }
3688         printk("FDC %d is a post-1991 82077\n",fdc);
3689         return FDC_82077;       /* Revised 82077AA passes all the tests */
3690 } /* get_fdc_version */
3691 
3692 /* lilo configuration */
3693 
3694 /* we make the invert_dcl function global. One day, somebody might
3695 want to centralize all thinkpad related options into one lilo option,
3696 there are just so many thinkpad related quirks! */
3697 void floppy_invert_dcl(int *ints,int param)
     /*  */
3698 {
3699         int i;
3700 
3701         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3702                 if (param)
3703                         default_drive_params[i].params.flags |= 0x80;
3704                 else
3705                         default_drive_params[i].params.flags &= ~0x80;
3706         }
3707         DPRINT("Configuring drives for inverted dcl\n");
3708 }
3709 
3710 static void daring(int *ints,int param)
     /*  */
3711 {
3712         int i;
3713 
3714         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3715                 if (param){
3716                         default_drive_params[i].params.select_delay = 0;
3717                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3718                 } else {
3719                         default_drive_params[i].params.select_delay = 2*HZ/100;
3720                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3721                 }
3722         }
3723         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3724 }
3725 
3726 static void allow_drives(int *ints, int param)
     /*  */
3727 {
3728         ALLOWED_DRIVE_MASK=param;
3729         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3730 }
3731 
3732 static void fdc2_adr(int *ints, int param)
     /*  */
3733 {
3734         FDC2 = param;
3735         if(param)
3736                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3737         else
3738                 DPRINT("disabling second fdc\n");
3739 }
3740 
3741 static void unex(int *ints,int param)
     /*  */
3742 {
3743         print_unex = param;
3744         DPRINT1("%sprinting messages for unexpected interrupts\n",
3745                 param ? "" : "not ");
3746 }
3747 
3748 static void set_cmos(int *ints, int dummy)
     /*  */
3749 {
3750         int current_drive=0;
3751 
3752         if ( ints[0] != 2 ){
3753                 DPRINT("wrong number of parameter for cmos\n");
3754                 return;
3755         }
3756         current_drive = ints[1];
3757         if (current_drive < 0 || current_drive >= 8 ){
3758                 DPRINT("bad drive for set_cmos\n");
3759                 return;
3760         }
3761         if(current_drive >= 4 && !FDC2)
3762                 fdc2_adr(0, 0x370);
3763         if(ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3764                 DPRINT1("bad cmos code %d\n", ints[2]);
3765                 return;
3766         }
3767         DP->cmos = ints[2];
3768         DPRINT1("setting cmos code to %d\n", ints[2]);
3769 }
3770 
3771 static struct param_table {
3772         const char *name;
3773         void (*fn)(int *ints, int param);
3774         int def_param;
3775 } config_params[]={
3776         { "allowed_drive_mask", allow_drives, 0xff },
3777         { "all_drives", allow_drives, 0xff },
3778         { "asus_pci", allow_drives, 0x33 },
3779 
3780         { "daring", daring, 1},
3781 
3782         { "two_fdc", fdc2_adr, 0x370 },
3783         { "one_fdc", fdc2_adr, 0 },
3784 
3785         { "thinkpad", floppy_invert_dcl, 1 },
3786 
3787         { "cmos", set_cmos, 0 },
3788 
3789         { "unexpected_interrupts", unex, 1 },
3790         { "no_unexpected_interrupts", unex, 0 },
3791         { "L40SX", unex, 0 } };
3792 
3793 #define FLOPPY_SETUP
3794 void floppy_setup(char *str, int *ints)
     /*  */
3795 {
3796         int i;
3797         int param;
3798         if(str)
3799                 for(i=0; i< ARRAY_SIZE(config_params); i++){
3800                         if (strcmp(str,config_params[i].name) == 0 ){
3801                                 if (ints[0] )
3802                                         param = ints[1];
3803                                 else
3804                                         param = config_params[i].def_param;
3805                                 config_params[i].fn(ints,param);
3806                                 return;
3807                         }
3808                 }
3809         if(str) {
3810                 DPRINT1("unknown floppy option [%s]\n", str);
3811                 
3812                 DPRINT("allowed options are:");
3813                 for(i=0; i< ARRAY_SIZE(config_params); i++)
3814                         printk(" %s",config_params[i].name);
3815                 printk("\n");
3816         } else
3817                 DPRINT("botched floppy option\n");
3818         DPRINT("Read linux/drivers/block/README.fd\n");
3819 }
3820 
3821 int floppy_init(void)
     /*  */
3822 {
3823         int i,unit,drive;
3824         int have_no_fdc=0;
3825 
3826         raw_cmd = 0;
3827 
3828         sti();
3829 
3830         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3831                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3832                 return -EBUSY;
3833         }
3834 
3835         for(i=0; i<256; i++)
3836                 if (TYPE(i))
3837                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3838                 else
3839                         floppy_sizes[i] = MAX_DISK_SIZE;
3840 
3841         blk_size[MAJOR_NR] = floppy_sizes;
3842         blksize_size[MAJOR_NR] = floppy_blocksizes;
3843         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3844         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3845         config_types();
3846 
3847         fdc_state[0].address = FDC1;
3848         fdc_state[0].dor = 0;
3849 #if N_FDC > 1
3850         fdc_state[1].address = FDC2;
3851         fdc_state[1].dor = 0;
3852 #endif
3853 
3854         for (i = 0 ; i < N_FDC ; i++) {
3855                 fdc = i;
3856                 FDCS->dtr = -1;
3857                 FDCS->dor = 0x4;
3858                 FDCS->reset = 0;
3859                 FDCS->version = FDC_NONE;
3860         }
3861 
3862         if(floppy_grab_irq_and_dma()){
3863                 unregister_blkdev(MAJOR_NR,"fd");
3864                 return -EBUSY;
3865         }
3866 
3867         /* initialise drive state */
3868         for (drive = 0; drive < N_DRIVE ; drive++) {
3869                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3870                 UDRS->generation = 0;
3871                 UDRS->keep_data = 0;
3872                 UDRS->fd_ref = 0;
3873                 UDRS->fd_device = 0;
3874                 floppy_track_buffer = NULL;
3875                 max_buffer_sectors = 0;
3876                 UDRWE->write_errors = 0;
3877                 UDRWE->first_error_sector = 0;
3878                 UDRWE->first_error_generation = 0;
3879                 UDRWE->last_error_sector = 0;
3880                 UDRWE->last_error_generation = 0;
3881                 UDRWE->badness = 0;
3882         }
3883 
3884         for (i = 0 ; i < N_FDC ; i++) {
3885                 fdc = i;
3886                 FDCS->driver_version = FD_DRIVER_VERSION;
3887                 for(unit=0; unit<4; unit++)
3888                         FDCS->track[unit] = 0;
3889                 if (FDCS->address == -1 )
3890                         continue;
3891                 FDCS->rawcmd = 2;
3892                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3893                         FDCS->address = -1;
3894                         continue;
3895                 }
3896                 /* Try to determine the floppy controller type */
3897                 FDCS->version = get_fdc_version();
3898                 if (FDCS->version == FDC_NONE){
3899                         FDCS->address = -1;
3900                         continue;
3901                 }
3902 
3903                 request_region(FDCS->address, 6, "floppy");
3904                 request_region(FDCS->address+7, 1, "floppy DIR");
3905                 /* address + 6 is reserved, and may be taken by IDE.
3906                  * Unfortunately, Adaptec doesn't know this :-(, */
3907 
3908                 have_no_fdc = 0;
3909                 /* Not all FDCs seem to be able to handle the version command
3910                  * properly, so force a reset for the standard FDC clones,
3911                  * to avoid interrupt garbage.
3912                  */
3913                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3914                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3915         }
3916         fdc=0;
3917         del_timer(&fd_timeout);
3918         current_drive = 0;
3919         floppy_release_irq_and_dma();
3920         initialising=0;
3921         if(have_no_fdc)
3922                 unregister_blkdev(MAJOR_NR,"fd");
3923         return have_no_fdc;
3924 }
3925 
3926 static int floppy_grab_irq_and_dma(void)
     /*  */
3927 {
3928         int i;
3929         cli();
3930         if (usage_count++){
3931                 sti();
3932                 return 0;
3933         }
3934         sti();
3935 #ifdef FD_MODULE
3936         MOD_INC_USE_COUNT;
3937 #endif
3938         for(i=0; i< N_FDC; i++){
3939                 if(FDCS->address != -1){
3940                         fdc = i;
3941                         reset_fdc_info(1);
3942                         outb_p(FDCS->dor, FD_DOR);
3943                 }
3944         }
3945         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3946 
3947         if (request_irq(FLOPPY_IRQ, floppy_interrupt,
3948                         SA_INTERRUPT|SA_SAMPLE_RANDOM, "floppy")) {
3949                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3950                         FLOPPY_IRQ);
3951                 return -1;
3952         }
3953         if (request_dma(FLOPPY_DMA,"floppy")) {
3954                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3955                         FLOPPY_DMA);
3956                 free_irq(FLOPPY_IRQ);
3957                 return -1;
3958         }
3959         for(fdc = 0; fdc < N_FDC ; fdc++)
3960                 if(FDCS->address != -1)
3961                         outb_p(FDCS->dor, FD_DOR);
3962         fdc = 0;
3963         enable_irq(FLOPPY_IRQ);
3964         return 0;
3965 }
3966 
3967 static void floppy_release_irq_and_dma(void)
     /*  */
3968 {
3969 #ifdef CONFIG_FLOPPY_SANITY
3970         int drive;
3971 #endif
3972         long tmpsize;
3973         void *tmpaddr;
3974 
3975         cli();
3976         if (--usage_count){
3977                 sti();
3978                 return;
3979         }
3980         sti();
3981 #ifdef FD_MODULE
3982         MOD_DEC_USE_COUNT;
3983 #endif
3984         disable_dma(FLOPPY_DMA);
3985         free_dma(FLOPPY_DMA);
3986         disable_irq(FLOPPY_IRQ);
3987         free_irq(FLOPPY_IRQ);
3988 
3989         set_dor(0, ~0, 8);
3990 #if N_FDC > 1
3991         set_dor(1, ~8, 0);
3992 #endif
3993         floppy_enable_hlt();
3994 
3995         if (floppy_track_buffer && max_buffer_sectors) {
3996                 tmpsize = max_buffer_sectors*1024;
3997                 tmpaddr = (void *)floppy_track_buffer;
3998                 floppy_track_buffer = 0;
3999                 max_buffer_sectors = 0;
4000                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
4001         }
4002 
4003 #ifdef CONFIG_FLOPPY_SANITY
4004         for(drive=0; drive < N_FDC * 4; drive++)
4005                 if( motor_off_timer[drive].next )
4006                         printk("motor off timer %d still active\n", drive);
4007 
4008         if(fd_timeout.next)
4009                 printk("floppy timer still active:%s\n", timeout_message);
4010         if (fd_timer.next)
4011                 printk("auxiliary floppy timer still active\n");
4012         if(floppy_tq.sync)
4013                 printk("task queue still active\n");
4014 #endif
4015 }
4016 
4017 
4018 #ifdef MODULE
4019 
4020 extern char *get_options(char *str, int *ints);
4021 
4022 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /*  */
4023 {
4024         int i;
4025         char c;
4026         int j;
4027         int match;
4028         char buffer[100];
4029         int ints[11];
4030         int length = strlen(pattern)+1;
4031 
4032         match=0;
4033         j=1;
4034 
4035         for(i=current->mm->env_start; i< current->mm->env_end; i ++){
4036                 c= get_fs_byte(i);
4037                 if(match){
4038                         if(j==99)
4039                                 c='\0';
4040                         buffer[j] = c;
4041                         if(!c || c == ' ' || c == '\t'){
4042                                 if(j){
4043                                         buffer[j] = '\0';
4044                                         setup(get_options(buffer,ints),ints);
4045                                 }
4046                                 j=0;
4047                         } else
4048                                 j++;
4049                         if(!c)
4050                                 break;
4051                         continue;
4052                 }
4053                 if( (!j && !c) || ( j && c == pattern[j-1]))
4054                         j++;
4055                 else
4056                         j=0;
4057                 if(j==length){
4058                         match=1;
4059                         j=0;
4060                 }
4061         }
4062 }
4063 
4064 
4065 #ifdef __cplusplus
4066 extern "C" {
4067 #endif
4068 int init_module(void)
     /*  */
4069 {
4070         int ret;
4071         printk("inserting floppy driver for %s\n", kernel_version);
4072                 
4073         mod_setup("floppy=", floppy_setup);
4074                 
4075         ret = floppy_init();
4076                 return 0;
4077 }
4078 
4079 void cleanup_module(void)
     /*  */
4080 {
4081         int fdc;
4082                 
4083         for(fdc=0; fdc<2; fdc++)
4084                 if (FDCS->address != -1){
4085                         release_region(FDCS->address, 6);
4086                         release_region(FDCS->address+7, 1);
4087         }
4088                 
4089         unregister_blkdev(MAJOR_NR, "fd");
4090 
4091         blk_dev[MAJOR_NR].request_fn = 0;
4092 }
4093 
4094 #ifdef __cplusplus
4095 }
4096 #endif
4097 
4098 #endif