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 /*
  85  * 1995/8/26 -- Andreas Busse -- added Mips support.
  86  */
  87 
  88 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
  89  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
  90  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
  91  * drives are "upside-down").
  92  */
  93 
  94 /*
  95  * 1995/18/10 -- Ralf Baechle -- Portability cleanup; move machine dependend
  96  * features to asm/floppy.h.
  97  */
  98 
  99 #define FLOPPY_SANITY_CHECK
 100 #undef  FLOPPY_SILENT_DCL_CLEAR
 101 
 102 #define REALLY_SLOW_IO
 103 
 104 #define DEBUGT 2
 105 #define DCL_DEBUG /* debug disk change line */
 106 
 107 /* do print messages for unexpected interrupts */
 108 static int print_unex=1;
 109 
 110 #include <linux/module.h>
 111 
 112 /* the following is the mask of allowed drives. By default units 2 and
 113  * 3 of both floppy controllers are disabled, because switching on the
 114  * motor of these drives causes system hangs on some PCI computers. drive
 115  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 116  * a drive is allowed. */
 117 static int FLOPPY_IRQ=6;
 118 static int FLOPPY_DMA=2;
 119 static int ALLOWED_DRIVE_MASK = 0x33;
 120 
 121 #include <linux/sched.h>
 122 #include <linux/fs.h>
 123 #include <linux/kernel.h>
 124 #include <linux/timer.h>
 125 #include <linux/tqueue.h>
 126 #define FDPATCHES
 127 #include <linux/fdreg.h>
 128 
 129 /* ============================================ *
 130  * old fd.h                                     *
 131  * =========================================== */
 132 
 133 #define OLDFDCLRPRM 0 /* clear user-defined parameters */
 134 #define OLDFDSETPRM 1 /* set user-defined parameters for current media */
 135 #define OLDFDSETMEDIAPRM 1
 136 #define OLDFDDEFPRM 2 /* set user-defined parameters until explicitly cleared */
 137 #define OLDFDDEFMEDIAPRM 2
 138 #define OLDFDGETPRM 3 /* get disk parameters */
 139 #define OLDFDGETMEDIAPRM 3
 140 #define OLDFDMSGON  4 /* issue kernel messages on media type change */
 141 #define OLDFDMSGOFF 5 /* don't issue kernel messages on media type change */
 142 #define OLDFDFMTBEG 6 /* begin formatting a disk */
 143 #define OLDFDFMTTRK 7 /* format the specified track */
 144 #define OLDFDFMTEND 8 /* end formatting a disk */
 145 #define OLDFDSETEMSGTRESH       10      /* set fdc error reporting threshold */
 146 #define OLDFDFLUSH  11 /* flush buffers for media; either for verifying media, or for
 147                        handling a media change without closing the file
 148                        descriptor */
 149 #define OLDFDSETMAXERRS 12 /* set abortion and read_track threshold */
 150 #define OLDFDGETMAXERRS 14 /* get abortion and read_track threshold */
 151 #define OLDFDGETDRVTYP 16          /* get drive type: 5 1/4 or 3 1/2 */
 152 
 153 #define OLDFDSETDRVPRM 20 /* set drive parameters */
 154 #define OLDFDGETDRVPRM 21 /* get drive parameters */
 155 #define OLDFDGETDRVSTAT 22 /* get drive state */
 156 #define OLDFDPOLLDRVSTAT 23 /* get drive state */
 157 #define OLDFDRESET 24 /* reset FDC */
 158 
 159 #define OLDFD_RESET_IF_NEEDED 0
 160 #define OLDFD_RESET_IF_RAWCMD 1
 161 #define OLDFD_RESET_ALWAYS 2
 162 
 163 #define OLDFDGETFDCSTAT 25 /* get fdc state */
 164 #define OLDFDWERRORCLR  27 /* clear write error and badness information */
 165 #define OLDFDWERRORGET  28 /* get write error and badness information */
 166 
 167 #define OLDFDRAWCMD 30 /* send a raw command to the fdc */
 168 
 169 #define OLDFDTWADDLE 40 /* flicker motor-on bit before reading a sector */
 170 
 171 struct old_floppy_raw_cmd {
 172   void *data;
 173   long length;
 174 
 175   unsigned char rate;
 176   unsigned char flags;
 177   unsigned char cmd_count;
 178   unsigned char cmd[9];
 179   unsigned char reply_count;
 180   unsigned char reply[7];
 181   int track;
 182 };
 183 
 184 struct old_floppy_fdc_state {   
 185         int spec1; /* spec1 value last used */
 186         int spec2; /* spec2 value last used */
 187         int dtr;
 188         unsigned char version;  /* FDC version code */
 189         unsigned char dor;
 190         int address; /* io address */
 191         unsigned int rawcmd:2;
 192         unsigned int reset:1;
 193         unsigned int need_configure:1;
 194         unsigned int perp_mode:2;
 195         unsigned int has_fifo:1;
 196 };
 197 
 198 
 199 #include <linux/fd.h>
 200 #include <linux/errno.h>
 201 #include <linux/malloc.h>
 202 #include <linux/mm.h>
 203 #include <linux/string.h>
 204 #include <linux/fcntl.h>
 205 #include <linux/delay.h>
 206 #include <linux/mc146818rtc.h> /* CMOS defines */
 207 #include <linux/ioport.h>
 208 
 209 #include <asm/dma.h>
 210 #include <asm/floppy.h>
 211 #include <asm/irq.h>
 212 #include <asm/system.h>
 213 #include <asm/io.h>
 214 #include <asm/segment.h>
 215 
 216 #define MAJOR_NR FLOPPY_MAJOR
 217 #include <linux/blk.h>
 218 
 219 
 220 /*
 221  * Dma Memory related stuff
 222  */
 223 /* Pure 2^n version of get_order */
 224 static inline int __get_order (int size)
     /*  */
 225 {
 226         int order;
 227 
 228 #ifdef  _ASM_IO_H2
 229         __asm__ __volatile__("bsr %1,%0"
 230                              : "=r" (order)
 231                              : "r" (size / PAGE_SIZE) );
 232 #else
 233         for (order = 0; order < NR_MEM_LISTS; ++order)
 234                 if (size <= (PAGE_SIZE << order))
 235                         return order;
 236 #endif
 237         return NR_MEM_LISTS;
 238 }
 239 
 240 static unsigned long dma_mem_alloc(int size)
     /*  */
 241 {
 242         int order = __get_order(size);
 243 
 244         if (order >= NR_MEM_LISTS)
 245                 return(0);
 246         return __get_dma_pages(GFP_KERNEL,order);
 247 }
 248 
 249 static unsigned int fake_change = 0;
 250 static int initialising=1;
 251 
 252 static inline int TYPE(kdev_t x) {
     /*  */
 253         return  (MINOR(x)>>2) & 0x1f;
 254 }
 255 static inline int DRIVE(kdev_t x) {
     /*  */
 256         return (MINOR(x)&0x03) | ((MINOR(x)&0x80 ) >> 5);
 257 }
 258 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 259 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 260 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 261 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 262                                 /* reverse mapping from unit and fdc to drive */
 263 #define DP (&drive_params[current_drive])
 264 #define DRS (&drive_state[current_drive])
 265 #define DRWE (&write_errors[current_drive])
 266 #define FDCS (&fdc_state[fdc])
 267 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 268 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 269 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 270 
 271 #define UDP (&drive_params[drive])
 272 #define UDRS (&drive_state[drive])
 273 #define UDRWE (&write_errors[drive])
 274 #define UFDCS (&fdc_state[FDC(drive)])
 275 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 276 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 277 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 278 
 279 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 280 
 281 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 282 
 283 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 284 
 285 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 286 
 287 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 288 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 289 
 290 /* read/write */
 291 #define COMMAND raw_cmd->cmd[0]
 292 #define DR_SELECT raw_cmd->cmd[1]
 293 #define TRACK raw_cmd->cmd[2]
 294 #define HEAD raw_cmd->cmd[3]
 295 #define SECTOR raw_cmd->cmd[4]
 296 #define SIZECODE raw_cmd->cmd[5]
 297 #define SECT_PER_TRACK raw_cmd->cmd[6]
 298 #define GAP raw_cmd->cmd[7]
 299 #define SIZECODE2 raw_cmd->cmd[8]
 300 #define NR_RW 9
 301 
 302 /* format */
 303 #define F_SIZECODE raw_cmd->cmd[2]
 304 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 305 #define F_GAP raw_cmd->cmd[4]
 306 #define F_FILL raw_cmd->cmd[5]
 307 #define NR_F 6
 308 
 309 /*
 310  * Maximum disk size (in kilobytes). This default is used whenever the
 311  * current disk size is unknown.
 312  * [Now it is rather a minimum]
 313  */
 314 #define MAX_DISK_SIZE 2 /* 3984*/
 315 
 316 #define K_64    0x10000         /* 64KB */
 317 
 318 /*
 319  * globals used by 'result()'
 320  */
 321 #define MAX_REPLIES 10
 322 static unsigned char reply_buffer[MAX_REPLIES];
 323 static int inr; /* size of reply buffer, when called from interrupt */
 324 #define ST0 (reply_buffer[0])
 325 #define ST1 (reply_buffer[1])
 326 #define ST2 (reply_buffer[2])
 327 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 328 #define R_TRACK (reply_buffer[3])
 329 #define R_HEAD (reply_buffer[4])
 330 #define R_SECTOR (reply_buffer[5])
 331 #define R_SIZECODE (reply_buffer[6])
 332 
 333 #define SEL_DLY (2*HZ/100)
 334 
 335 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 336 /*
 337  * this struct defines the different floppy drive types.
 338  */
 339 static struct {
 340         struct floppy_drive_params params;
 341         const char *name; /* name printed while booting */
 342 } default_drive_params[]= {
 343 /* NOTE: the time values in jiffies should be in msec!
 344  CMOS drive type
 345   |     Maximum data rate supported by drive type
 346   |     |   Head load time, msec
 347   |     |   |   Head unload time, msec (not used)
 348   |     |   |   |     Step rate interval, usec
 349   |     |   |   |     |       Time needed for spinup time (jiffies)
 350   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 351   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 352   |     |   |   |     |       |      |   |     Select delay
 353   |     |   |   |     |       |      |   |     |     RPS
 354   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 355   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 356   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 357   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 358 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 359       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 360 
 361 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 362       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 363 
 364 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 365       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 366 
 367 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 368       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 369 
 370 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 371       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 372 
 373 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 374       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 375 
 376 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 377       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 378 /*    |  --autodetected formats---    |      |      |
 379  *    read_track                      |      |    Name printed when booting
 380  *                                    |     Native format
 381  *                  Frequency of disk change checks */
 382 };
 383 
 384 static struct floppy_drive_params drive_params[N_DRIVE];
 385 static struct floppy_drive_struct drive_state[N_DRIVE];
 386 static struct floppy_write_errors write_errors[N_DRIVE];
 387 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 388 
 389 /*
 390  * This struct defines the different floppy types.
 391  *
 392  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 393  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 394  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 395  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 396  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 397  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 398  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 399  * 'stretch' should probably be renamed to something more general, like
 400  * 'options'.  Other parameters should be self-explanatory (see also
 401  * setfdprm(8)).
 402  */
 403 static struct floppy_struct floppy_type[32] = {
 404         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 405         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 406         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 407         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 408         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 409         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 410         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 411         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 412         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 413         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 414 
 415         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 416         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 417         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 418         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 419         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 420         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 421         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 422         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 423         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 424         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 425 
 426         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 427         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 428         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 429         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 430         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 431         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 432         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 433         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 434         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 435 
 436         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 437         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 438         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 439 };
 440 
 441 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 442 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 443 
 444 /* Auto-detection: Disk type used until the next media change occurs. */
 445 struct floppy_struct *current_type[N_DRIVE] = {
 446         NULL, NULL, NULL, NULL,
 447         NULL, NULL, NULL, NULL
 448 };
 449 
 450 /*
 451  * User-provided type information. current_type points to
 452  * the respective entry of this array.
 453  */
 454 struct floppy_struct user_params[N_DRIVE];
 455 
 456 static int floppy_sizes[256];
 457 static int floppy_blocksizes[256] = { 0, };
 458 
 459 /*
 460  * The driver is trying to determine the correct media format
 461  * while probing is set. rw_interrupt() clears it after a
 462  * successful access.
 463  */
 464 static int probing = 0;
 465 
 466 /* Synchronization of FDC access. */
 467 #define FD_COMMAND_DETECT -2
 468 #define FD_COMMAND_NONE -1
 469 #define FD_COMMAND_ERROR 2
 470 #define FD_COMMAND_OKAY 3
 471 
 472 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 473 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 474 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 475 #define CALL(x) if( (x) == -EINTR) return -EINTR
 476 #define ECALL(x) if((ret = (x))) return ret;
 477 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 478 #define WAIT(x) _WAIT((x),interruptible)
 479 #define IWAIT(x) _WAIT((x),1)
 480 
 481 /* Errors during formatting are counted here. */
 482 static int format_errors;
 483 
 484 /* Format request descriptor. */
 485 static struct format_descr format_req;
 486 
 487 /*
 488  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 489  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 490  * H is head unload time (1=16ms, 2=32ms, etc)
 491  */
 492 
 493 /*
 494  * Track buffer
 495  * Because these are written to by the DMA controller, they must
 496  * not contain a 64k byte boundary crossing, or data will be
 497  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 498  * Note that you must not change the sizes below without updating head.S.
 499  */
 500 char *floppy_track_buffer=0;
 501 int max_buffer_sectors=0;
 502 
 503 int *errors;
 504 typedef void (*done_f)(int);
 505 struct cont_t {
 506         void (*interrupt)(void); /* this is called after the interrupt of the
 507                                   * main command */
 508         void (*redo)(void); /* this is called to retry the operation */
 509         void (*error)(void); /* this is called to tally an error */
 510         done_f done; /* this is called to say if the operation has 
 511                       * succeeded/failed */
 512 } *cont=NULL;
 513 
 514 static void floppy_ready(void);
 515 static void floppy_start(void);
 516 static void process_fd_request(void);
 517 static void recalibrate_floppy(void);
 518 static void floppy_shutdown(void);
 519 
 520 static int floppy_grab_irq_and_dma(void);
 521 static void floppy_release_irq_and_dma(void);
 522 
 523 /*
 524  * The "reset" variable should be tested whenever an interrupt is scheduled,
 525  * after the commands have been sent. This is to ensure that the driver doesn't
 526  * get wedged when the interrupt doesn't come because of a failed command.
 527  * reset doesn't need to be tested before sending commands, because
 528  * output_byte is automatically disabled when reset is set.
 529  */
 530 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 531 static void reset_fdc(void);
 532 
 533 /*
 534  * These are global variables, as that's the easiest way to give
 535  * information to interrupts. They are the data used for the current
 536  * request.
 537  */
 538 #define NO_TRACK -1
 539 #define NEED_1_RECAL -2
 540 #define NEED_2_RECAL -3
 541 
 542 /* */
 543 static int usage_count = 0;
 544 
 545 
 546 /* buffer related variables */
 547 static int buffer_track = -1;
 548 static int buffer_drive = -1;
 549 static int buffer_min = -1;
 550 static int buffer_max = -1;
 551 
 552 /* fdc related variables, should end up in a struct */
 553 static struct floppy_fdc_state fdc_state[N_FDC];
 554 static int fdc; /* current fdc */
 555 
 556 static struct floppy_struct * floppy = floppy_type;
 557 static unsigned char current_drive = 0;
 558 static long current_count_sectors = 0;
 559 static unsigned char sector_t; /* sector in track */
 560 
 561 #ifdef DEBUGT
 562 long unsigned debugtimer;
 563 #endif
 564 
 565 /*
 566  * Debugging
 567  * =========
 568  */
 569 static inline void set_debugt(void)
     /*  */
 570 {
 571 #ifdef DEBUGT
 572         debugtimer = jiffies;
 573 #endif
 574 }
 575 
 576 static inline void debugt(const char *message)
     /*  */
 577 {
 578 #ifdef DEBUGT
 579         if ( DP->flags & DEBUGT )
 580                 printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 581 #endif
 582 }
 583 
 584 typedef void (*timeout_fn)(unsigned long);
 585 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 586                                        (timeout_fn) floppy_shutdown };
 587 
 588 static const char *timeout_message;
 589 
 590 #ifdef FLOPPY_SANITY_CHECK
 591 static void is_alive(const char *message)
     /*  */
 592 {
 593         /* this routine checks whether the floppy driver is "alive" */
 594         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 595                 DPRINT1("timeout handler died: %s\n",message);
 596         }
 597 }
 598 #endif
 599 
 600 #ifdef FLOPPY_SANITY_CHECK
 601 
 602 #define OLOGSIZE 20
 603 
 604 void (*lasthandler)(void) = NULL;
 605 int interruptjiffies=0;
 606 int resultjiffies=0;
 607 int resultsize=0;
 608 int lastredo=0;
 609 
 610 static struct output_log {
 611         unsigned char data;
 612         unsigned char status;
 613         unsigned long jiffies;
 614 } output_log[OLOGSIZE];
 615 
 616 static int output_log_pos=0;
 617 #endif
 618 
 619 #define CURRENTD -1
 620 #define MAXTIMEOUT -2
 621 
 622 
 623 
 624 static void reschedule_timeout(int drive, const char *message, int marg)
     /*  */
 625 {
 626         if (drive == CURRENTD )
 627                 drive = current_drive;
 628         del_timer(&fd_timeout);
 629         if (drive < 0 || drive > N_DRIVE) {
 630                 fd_timeout.expires = jiffies + 20*HZ;
 631                 drive=0;
 632         } else
 633                 fd_timeout.expires = jiffies + UDP->timeout;
 634         add_timer(&fd_timeout);
 635         if (UDP->flags & FD_DEBUG){
 636                 DPRINT("reschedule timeout ");
 637                 printk(message, marg);
 638                 printk("\n");
 639         }
 640         timeout_message = message;
 641 }
 642 
 643 /*
 644  * Bottom half floppy driver.
 645  * ==========================
 646  *
 647  * This part of the file contains the code talking directly to the hardware,
 648  * and also the main service loop (seek-configure-spinup-command)
 649  */
 650 
 651 /*
 652  * disk change.
 653  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 654  * and the last_checked date.
 655  *
 656  * last_checked is the date of the last check which showed 'no disk change'
 657  * FD_DISK_CHANGE is set under two conditions:
 658  * 1. The floppy has been changed after some i/o to that floppy already
 659  *    took place.
 660  * 2. No floppy disk is in the drive. This is done in order to ensure that
 661  *    requests are quickly flushed in case there is no disk in the drive. It
 662  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 663  *    the drive.
 664  *
 665  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 666  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 667  *  each seek. If a disk is present, the disk change line should also be
 668  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 669  *  change line is set, this means either that no disk is in the drive, or
 670  *  that it has been removed since the last seek.
 671  *
 672  * This means that we really have a third possibility too:
 673  *  The floppy has been changed after the last seek.
 674  */
 675 
 676 static int disk_change(int drive)
     /*  */
 677 {
 678         int fdc=FDC(drive);
 679 #ifdef FLOPPY_SANITY_CHECK
 680         if(jiffies < UDP->select_delay + UDRS->select_date)
 681                 DPRINT("WARNING disk change called early\n");
 682         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 683            (FDCS->dor & 3) != UNIT(drive) ||
 684            fdc != FDC(drive)){
 685                 DPRINT("probing disk change on unselected drive\n");
 686                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 687                         FDCS->dor);
 688         }
 689 #endif
 690 
 691 #ifdef DCL_DEBUG
 692         if (UDP->flags & FD_DEBUG){
 693                 DPRINT1("checking disk change line for drive %d\n",drive);
 694                 DPRINT1("jiffies=%ld\n", jiffies);
 695                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 696                 DPRINT1("flags=%x\n",UDRS->flags);
 697         }
 698 #endif
 699         if (UDP->flags & FD_BROKEN_DCL)
 700                 return UTESTF(FD_DISK_CHANGED);
 701         if( (fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 702                 USETF(FD_VERIFY); /* verify write protection */
 703                 if(UDRS->maxblock){
 704                         /* mark it changed */
 705                         USETF(FD_DISK_CHANGED);
 706 
 707                         /* invalidate its geometry */
 708                         if (UDRS->keep_data >= 0) {
 709                                 if ((UDP->flags & FTD_MSG) &&
 710                                     current_type[drive] != NULL)
 711                                         DPRINT("Disk type is undefined after "
 712                                                "disk change\n");
 713                                 current_type[drive] = NULL;
 714                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 715                         }
 716                 }
 717                 /*USETF(FD_DISK_NEWCHANGE);*/
 718                 return 1;
 719         } else {
 720                 UDRS->last_checked=jiffies;
 721                 UCLEARF(FD_DISK_NEWCHANGE);
 722         }
 723         return 0;
 724 }
 725 
 726 static inline int is_selected(int dor, int unit)
     /*  */
 727 {
 728         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 729 }
 730 
 731 static int set_dor(int fdc, char mask, char data)
     /*  */
 732 {
 733         register unsigned char drive, unit, newdor,olddor;
 734 
 735         if(FDCS->address == -1)
 736                 return -1;
 737 
 738         olddor = FDCS->dor;
 739         newdor =  (olddor & mask) | data;
 740         if ( newdor != olddor ){
 741                 unit = olddor & 0x3;
 742                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 743                         drive = REVDRIVE(fdc,unit);
 744 #ifdef DCL_DEBUG
 745                         if (UDP->flags & FD_DEBUG){
 746                                 DPRINT("calling disk change from set_dor\n");
 747                         }
 748 #endif
 749                         disk_change(drive);
 750                 }
 751                 FDCS->dor = newdor;
 752                 fd_outb(newdor, FD_DOR);
 753 
 754                 unit = newdor & 0x3;
 755                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 756                         drive = REVDRIVE(fdc,unit);
 757                         UDRS->select_date = jiffies;
 758                 }
 759         }
 760         if ( newdor & 0xf0 )
 761                 floppy_grab_irq_and_dma();
 762         if( olddor & 0xf0 )
 763                 floppy_release_irq_and_dma();
 764         return olddor;
 765 }
 766 
 767 static void twaddle(void)
     /*  */
 768 {
 769         if (DP->select_delay)
 770                 return;
 771         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 772         fd_outb(FDCS->dor, FD_DOR);
 773         DRS->select_date = jiffies;
 774 }
 775 
 776 /* reset all driver information about the current fdc. This is needed after
 777  * a reset, and after a raw command. */
 778 static void reset_fdc_info(int mode)
     /*  */
 779 {
 780         int drive;
 781 
 782         FDCS->spec1 = FDCS->spec2 = -1;
 783         FDCS->need_configure = 1;
 784         FDCS->perp_mode = 1;
 785         FDCS->rawcmd = 0;
 786         for ( drive = 0; drive < N_DRIVE; drive++)
 787                 if (FDC(drive) == fdc &&
 788                     ( mode || UDRS->track != NEED_1_RECAL))
 789                         UDRS->track = NEED_2_RECAL;
 790 }
 791 
 792 /* selects the fdc and drive, and enables the fdc's input/dma. */
 793 static void set_fdc(int drive)
     /*  */
 794 {
 795         if (drive >= 0 && drive < N_DRIVE){
 796                 fdc = FDC(drive);
 797                 current_drive = drive;
 798         }
 799         set_dor(fdc,~0,8);
 800         set_dor(1-fdc, ~8, 0);
 801         if ( FDCS->rawcmd == 2 )
 802                 reset_fdc_info(1);
 803         if ( fd_inb(FD_STATUS) != STATUS_READY )
 804                 FDCS->reset = 1;
 805 }
 806 
 807 /* locks the driver */
 808 static int lock_fdc(int drive, int interruptible)
     /*  */
 809 {
 810         if(!usage_count){
 811                 printk("trying to lock fdc while usage count=0\n");
 812                 return -1;
 813         }
 814         floppy_grab_irq_and_dma();
 815         cli();
 816         while (fdc_busy && NO_SIGNAL)
 817                 interruptible_sleep_on(&fdc_wait);
 818         if(fdc_busy){
 819                 sti();
 820                 return -EINTR;
 821         }
 822         fdc_busy = 1;
 823         sti();
 824         command_status = FD_COMMAND_NONE;
 825         set_fdc(drive);
 826         reschedule_timeout(drive, "lock fdc", 0);
 827         return 0;
 828 }
 829 
 830 #define LOCK_FDC(drive,interruptible) \
 831 if(lock_fdc(drive,interruptible)) return -EINTR;
 832 
 833 
 834 /* unlocks the driver */
 835 static inline void unlock_fdc(void)
     /*  */
 836 {
 837         raw_cmd = 0;
 838         if (!fdc_busy)
 839                 DPRINT("FDC access conflict!\n");
 840 
 841         if ( DEVICE_INTR )
 842                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 843                         DEVICE_INTR);
 844         command_status = FD_COMMAND_NONE;
 845         del_timer(&fd_timeout);
 846         cont = NULL;
 847         fdc_busy = 0;
 848         floppy_release_irq_and_dma();
 849         wake_up(&fdc_wait);
 850 }
 851 
 852 /* switches the motor off after a given timeout */
 853 static void motor_off_callback(unsigned long nr)
     /*  */
 854 {
 855         unsigned char mask = ~(0x10 << UNIT(nr));
 856 
 857         set_dor( FDC(nr), mask, 0 );
 858 }
 859 
 860 static struct timer_list motor_off_timer[N_DRIVE] = {
 861         { NULL, NULL, 0, 0, motor_off_callback },
 862         { NULL, NULL, 0, 1, motor_off_callback },
 863         { NULL, NULL, 0, 2, motor_off_callback },
 864         { NULL, NULL, 0, 3, motor_off_callback },
 865         { NULL, NULL, 0, 4, motor_off_callback },
 866         { NULL, NULL, 0, 5, motor_off_callback },
 867         { NULL, NULL, 0, 6, motor_off_callback },
 868         { NULL, NULL, 0, 7, motor_off_callback }
 869 };
 870 
 871 /* schedules motor off */
 872 static void floppy_off(unsigned int drive)
     /*  */
 873 {
 874         unsigned long volatile delta;
 875         register int fdc=FDC(drive);
 876 
 877         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 878                 return;
 879 
 880         del_timer(motor_off_timer+drive);
 881 
 882         /* make spindle stop in a position which minimizes spinup time
 883          * next time */
 884         if (UDP->rps ){
 885                 delta = jiffies - UDRS->first_read_date + HZ -
 886                         UDP->spindown_offset;
 887                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 888                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 889         }
 890         add_timer(motor_off_timer+drive);
 891 }
 892 
 893 /*
 894  * cycle through all N_DRIVE floppy drives, for disk change testing.
 895  * stopping at current drive. This is done before any long operation, to
 896  * be sure to have up to date disk change information.
 897  */
 898 static void scandrives(void)
     /*  */
 899 {
 900         int i, drive, saved_drive;
 901 
 902         if (DP->select_delay)
 903                 return;
 904 
 905         saved_drive = current_drive;
 906         for(i=0; i< N_DRIVE; i++){
 907                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 908                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 909                         continue; /* skip closed drives */
 910                 set_fdc(drive);
 911                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 912                       (0x10 << UNIT(drive))))
 913                         /* switch the motor off again, if it was off to
 914                          * begin with */
 915                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 916         }
 917         set_fdc(saved_drive);
 918 }
 919 
 920 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 921 
 922 /* this function makes sure that the disk stays in the drive during the
 923  * transfer */
 924 static void fd_watchdog(void)
     /*  */
 925 {
 926 #ifdef DCL_DEBUG
 927         if (DP->flags & FD_DEBUG){
 928                 DPRINT("calling disk change from watchdog\n");
 929         }
 930 #endif
 931 
 932         if ( disk_change(current_drive) ){
 933                 DPRINT("disk removed during i/o\n");
 934                 floppy_shutdown();
 935         } else {
 936                 del_timer(&fd_timer);
 937                 fd_timer.function = (timeout_fn) fd_watchdog;
 938                 fd_timer.expires = jiffies + HZ / 10;
 939                 add_timer(&fd_timer);
 940         }
 941 }
 942 
 943 static void main_command_interrupt(void)
     /*  */
 944 {
 945         del_timer(&fd_timer);
 946         cont->interrupt();
 947 }
 948 
 949 /* waits for a delay (spinup or select) to pass */
 950 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 951 {
 952         if ( FDCS->reset ){
 953                 reset_fdc(); /* do the reset during sleep to win time
 954                               * if we don't need to sleep, it's a good
 955                               * occasion anyways */
 956                 return 1;
 957         }
 958 
 959         if ( jiffies < delay ){
 960                 del_timer(&fd_timer);
 961                 fd_timer.function = function;
 962                 fd_timer.expires = delay;
 963                 add_timer(&fd_timer);
 964                 return 1;
 965         }
 966         return 0;
 967 }
 968 
 969 static int hlt_disabled=0;
 970 static void floppy_disable_hlt(void)
     /*  */
 971 {
 972         unsigned long flags;
 973         save_flags(flags);
 974         cli();
 975         if(!hlt_disabled){
 976                 hlt_disabled=1;
 977 #ifdef HAVE_DISABLE_HLT
 978                 disable_hlt();
 979 #endif
 980         }
 981         restore_flags(flags);
 982 }
 983 
 984 static void floppy_enable_hlt(void)
     /*  */
 985 {
 986         unsigned long flags;
 987         save_flags(flags);
 988         cli();
 989         if(hlt_disabled){
 990                 hlt_disabled=0;
 991 #ifdef HAVE_DISABLE_HLT
 992                 enable_hlt();
 993 #endif
 994         }
 995         restore_flags(flags);
 996 }
 997 
 998 
 999 static void setup_DMA(void)
     /*  */
1000 {
1001 #ifdef FLOPPY_SANITY_CHECK
1002         if (raw_cmd->length == 0){
1003                 int i;
1004 
1005                 printk("zero dma transfer size:");
1006                 for(i=0; i< raw_cmd->cmd_count; i++)
1007                         printk("%x,", raw_cmd->cmd[i]);
1008                 printk("\n");
1009                 cont->done(0);
1010                 FDCS->reset = 1;
1011                 return;
1012         }
1013 #if 0
1014         /* disabled because of new buffer location for raw cmd */
1015         if ((!CURRENT ||
1016              CURRENT->buffer != raw_cmd->kernel_data ||
1017              raw_cmd->length > 512 * CURRENT->nr_sectors) &&
1018             (raw_cmd->kernel_data < floppy_track_buffer ||
1019              raw_cmd->kernel_data + raw_cmd->length >
1020              floppy_track_buffer + 1024 * max_buffer_sectors)){
1021                 printk("bad address. start=%p lg=%lx tb=%p\n",
1022                        raw_cmd->kernel_data, raw_cmd->length, 
1023                        floppy_track_buffer);
1024                 if ( CURRENT ){
1025                         printk("buffer=%p nr=%lx cnr=%lx\n",
1026                                CURRENT->buffer, CURRENT->nr_sectors,
1027                                CURRENT->current_nr_sectors);
1028                 }
1029                 cont->done(0);
1030                 FDCS->reset=1;
1031                 return;
1032         }
1033 #endif
1034         if ((long) raw_cmd->kernel_data % 512 ){
1035                 printk("non aligned address: %p\n", raw_cmd->kernel_data );
1036                 cont->done(0);
1037                 FDCS->reset=1;
1038                 return;
1039         }
1040         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
1041                 printk("DMA crossing 64-K boundary %p-%p\n",
1042                        raw_cmd->kernel_data,
1043                        raw_cmd->kernel_data + raw_cmd->length);
1044                 cont->done(0);
1045                 FDCS->reset=1;
1046                 return;
1047         }
1048 #endif
1049         cli();
1050         fd_disable_dma();
1051         fd_clear_dma_ff();
1052         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1053                          DMA_MODE_READ : DMA_MODE_WRITE);
1054         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1055         fd_set_dma_count(raw_cmd->length);
1056         fd_enable_dma();
1057         sti();
1058         floppy_disable_hlt();
1059 }
1060 
1061 /* sends a command byte to the fdc */
1062 static int output_byte(char byte)
     /*  */
1063 {
1064         int counter;
1065         unsigned char status = 0;
1066         unsigned char rstatus;
1067 
1068         if (FDCS->reset)
1069                 return -1;
1070         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1071                 rstatus = fd_inb(FD_STATUS);
1072                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1073                 if (!(status & STATUS_READY))
1074                         continue;
1075                 if (status == STATUS_READY){
1076                         fd_outb(byte,FD_DATA);
1077 
1078 #ifdef FLOPPY_SANITY_CHECK
1079                         output_log[output_log_pos].data = byte;
1080                         output_log[output_log_pos].status = rstatus;
1081                         output_log[output_log_pos].jiffies = jiffies;
1082                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1083 #endif
1084                         return 0;
1085                 } else
1086                         break;
1087         }
1088         FDCS->reset = 1;
1089         if ( !initialising )
1090                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1091                         byte, status);
1092         return -1;
1093 }
1094 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
1095 
1096 /* gets the response from the fdc */
1097 static int result(void)
     /*  */
1098 {
1099         int i = 0, counter, status = 0;
1100 
1101         if (FDCS->reset)
1102                 return -1;
1103         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1104                 status = fd_inb(FD_STATUS)&
1105                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1106                 if (!(status & STATUS_READY))
1107                         continue;
1108                 if (status == STATUS_READY){
1109 #ifdef FLOPPY_SANITY_CHECK
1110                         resultjiffies = jiffies;
1111                         resultsize = i;
1112 #endif
1113                         return i;
1114                 }
1115                 if (status & STATUS_DMA )
1116                         break;
1117                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1118                         if (i >= MAX_REPLIES) {
1119                                 DPRINT("floppy_stat reply overrun\n");
1120                                 break;
1121                         }
1122                         reply_buffer[i++] = fd_inb(FD_DATA);
1123                 }
1124         }
1125         FDCS->reset = 1;
1126         if ( !initialising )
1127                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1128                         status, fdc, i);
1129         return -1;
1130 }
1131 
1132 /* Set perpendicular mode as required, based on data rate, if supported.
1133  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1134  */
1135 static inline void perpendicular_mode(void)
     /*  */
1136 {
1137         unsigned char perp_mode;
1138 
1139         if (!floppy)
1140                 return;
1141         if (floppy->rate & 0x40){
1142                 switch(raw_cmd->rate){
1143                         case 0:
1144                                 perp_mode=2;
1145                                 break;
1146                         case 3:
1147                                 perp_mode=3;
1148                                 break;
1149                         default:
1150                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1151                                 cont->done(0);
1152                                 FDCS->reset = 1; /* convenient way to return to
1153                                                   * redo without to much hassle (deep
1154                                                   * stack et al. */
1155                                 return;
1156                 }
1157         } else
1158                 perp_mode = 0;
1159 
1160         if ( FDCS->perp_mode == perp_mode )
1161                 return;
1162         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1163                 output_byte(FD_PERPENDICULAR);
1164                 output_byte(perp_mode);
1165                 FDCS->perp_mode = perp_mode;
1166         } else if (perp_mode) {
1167                 DPRINT("perpendicular mode not supported by this FDC.\n");
1168         }
1169 } /* perpendicular_mode */
1170 
1171 #define NOMINAL_DTR 500
1172 
1173 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1174  * head load time, and DMA disable flag to values needed by floppy.
1175  *
1176  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1177  * to account for the data rate-based scaling done by the 82072 and 82077
1178  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1179  * 8272a).
1180  *
1181  * Note that changing the data transfer rate has a (probably deleterious)
1182  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1183  * fdc_specify is called again after each data transfer rate
1184  * change.
1185  *
1186  * srt: 1000 to 16000 in microseconds
1187  * hut: 16 to 240 milliseconds
1188  * hlt: 2 to 254 milliseconds
1189  *
1190  * These values are rounded up to the next highest available delay time.
1191  */
1192 static void fdc_specify(void)
     /*  */
1193 {
1194         unsigned char spec1, spec2;
1195         int srt, hlt, hut;
1196         unsigned long dtr = NOMINAL_DTR;
1197         unsigned long scale_dtr = NOMINAL_DTR;
1198         int hlt_max_code = 0x7f;
1199         int hut_max_code = 0xf;
1200 
1201         if (FDCS->need_configure && FDCS->has_fifo) {
1202                 if ( FDCS->reset )
1203                         return;
1204                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1205                 /* TODO: lock this in via LOCK during initialization */
1206                 output_byte(FD_CONFIGURE);
1207                 output_byte(0);
1208                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1209                 output_byte(0);         /* precompensation from track 0 upwards */
1210                 if ( FDCS->reset ){
1211                         FDCS->has_fifo=0;
1212                         return;
1213                 }
1214                 FDCS->need_configure = 0;
1215                 /*DPRINT("FIFO enabled\n");*/
1216         }
1217 
1218         switch (raw_cmd->rate & 0x03) {
1219                 case 3:
1220                         dtr = 1000;
1221                         break;
1222                 case 1:
1223                         dtr = 300;
1224                         break;
1225                 case 2:
1226                         dtr = 250;
1227                         break;
1228         }
1229 
1230         if (FDCS->version >= FDC_82072) {
1231                 scale_dtr = dtr;
1232                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1233                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1234         }
1235 
1236         /* Convert step rate from microseconds to milliseconds and 4 bits */
1237         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1238         if (srt > 0xf)
1239                 srt = 0xf;
1240         else if (srt < 0)
1241                 srt = 0;
1242 
1243         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1244         if (hlt < 0x01)
1245                 hlt = 0x01;
1246         else if (hlt > 0x7f)
1247                 hlt = hlt_max_code;
1248 
1249         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1250         if (hut < 0x1)
1251                 hut = 0x1;
1252         else if (hut > 0xf)
1253                 hut = hut_max_code;
1254 
1255         spec1 = (srt << 4) | hut;
1256         spec2 = (hlt << 1);
1257 
1258         /* If these parameters did not change, just return with success */
1259         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1260                 /* Go ahead and set spec1 and spec2 */
1261                 output_byte(FD_SPECIFY);
1262                 output_byte(FDCS->spec1 = spec1);
1263                 output_byte(FDCS->spec2 = spec2);
1264         }
1265 } /* fdc_specify */
1266 
1267 /* Set the FDC's data transfer rate on behalf of the specified drive.
1268  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1269  * of the specify command (i.e. using the fdc_specify function).
1270  */
1271 static int fdc_dtr(void)
     /*  */
1272 {
1273         /* If data rate not already set to desired value, set it. */
1274         if ( raw_cmd->rate == FDCS->dtr)
1275                 return 0;
1276 
1277         /* Set dtr */
1278         fd_outb(raw_cmd->rate, FD_DCR);
1279 
1280         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1281          * need a stabilization period of several milliseconds to be
1282          * enforced after data rate changes before R/W operations.
1283          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1284          */
1285         FDCS->dtr = raw_cmd->rate;
1286         return(wait_for_completion(jiffies+2*HZ/100,
1287                                    (timeout_fn) floppy_ready));
1288 } /* fdc_dtr */
1289 
1290 static void tell_sector(void)
     /*  */
1291 {
1292         printk(": track %d, head %d, sector %d, size %d",
1293                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1294 } /* tell_sector */
1295 
1296 
1297 /*
1298  * Ok, this error interpreting routine is called after a
1299  * DMA read/write has succeeded
1300  * or failed, so we check the results, and copy any buffers.
1301  * hhb: Added better error reporting.
1302  * ak: Made this into a separate routine.
1303  */
1304 static int interpret_errors(void)
     /*  */
1305 {
1306         char bad;
1307 
1308         if (inr!=7) {
1309                 DPRINT("-- FDC reply error");
1310                 FDCS->reset = 1;
1311                 return 1;
1312         }
1313 
1314         /* check IC to find cause of interrupt */
1315         switch (ST0 & ST0_INTR) {
1316                 case 0x40:      /* error occurred during command execution */
1317                         bad = 1;
1318                         if (ST1 & ST1_WP) {
1319                                 DPRINT("Drive is write protected\n");
1320                                 CLEARF(FD_DISK_WRITABLE);
1321                                 cont->done(0);
1322                                 bad = 2;
1323                         } else if (ST1 & ST1_ND) {
1324                                 SETF(FD_NEED_TWADDLE);
1325                         } else if (ST1 & ST1_OR) {
1326                                 if (DP->flags & FTD_MSG )
1327                                         DPRINT("Over/Underrun - retrying\n");
1328                                 bad = 0;
1329                         }else if(*errors >= DP->max_errors.reporting){
1330                                 DPRINT("");
1331                                 if (ST0 & ST0_ECE) {
1332                                         printk("Recalibrate failed!");
1333                                 } else if (ST2 & ST2_CRC) {
1334                                         printk("data CRC error");
1335                                         tell_sector();
1336                                 } else if (ST1 & ST1_CRC) {
1337                                         printk("CRC error");
1338                                         tell_sector();
1339                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1340                                         if (!probing) {
1341                                                 printk("sector not found");
1342                                                 tell_sector();
1343                                         } else
1344                                                 printk("probe failed...");
1345                                 } else if (ST2 & ST2_WC) {      /* seek error */
1346                                         printk("wrong cylinder");
1347                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1348                                         printk("bad cylinder");
1349                                 } else {
1350                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1351                                         tell_sector();
1352                                 }
1353                                 printk("\n");
1354 
1355                         }
1356                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1357                                 /* wrong cylinder => recal */
1358                                 DRS->track = NEED_2_RECAL;
1359                         return bad;
1360                 case 0x80: /* invalid command given */
1361                         DPRINT("Invalid FDC command given!\n");
1362                         cont->done(0);
1363                         return 2;
1364                 case 0xc0:
1365                         DPRINT("Abnormal termination caused by polling\n");
1366                         cont->error();
1367                         return 2;
1368                 default: /* (0) Normal command termination */
1369                         return 0;
1370         }
1371 }
1372 
1373 /*
1374  * This routine is called when everything should be correctly set up
1375  * for the transfer (ie floppy motor is on, the correct floppy is
1376  * selected, and the head is sitting on the right track).
1377  */
1378 static void setup_rw_floppy(void)
     /*  */
1379 {
1380         int i,ready_date,r, flags,dflags;
1381         timeout_fn function;
1382 
1383         flags = raw_cmd->flags;
1384         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1385                 flags |= FD_RAW_INTR;
1386 
1387         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1388                 ready_date = DRS->spinup_date + DP->spinup;
1389                 /* If spinup will take a long time, rerun scandrives
1390                  * again just before spinup completion. Beware that
1391                  * after scandrives, we must again wait for selection.
1392                  */
1393                 if ( ready_date > jiffies + DP->select_delay){
1394                         ready_date -= DP->select_delay;
1395                         function = (timeout_fn) floppy_start;
1396                 } else
1397                         function = (timeout_fn) setup_rw_floppy;
1398 
1399                 /* wait until the floppy is spinning fast enough */
1400                 if (wait_for_completion(ready_date,function))
1401                         return;
1402         }
1403         dflags = DRS->flags;
1404 
1405         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1406                 setup_DMA();
1407 
1408         if ( flags & FD_RAW_INTR )
1409                 SET_INTR(main_command_interrupt);
1410 
1411         r=0;
1412         for(i=0; i< raw_cmd->cmd_count; i++)
1413                 r|=output_byte( raw_cmd->cmd[i] );
1414 
1415 #ifdef DEBUGT
1416         debugt("rw_command: ");
1417 #endif
1418         if ( r ){
1419                 reset_fdc();
1420                 return;
1421         }
1422 
1423         if ( ! ( flags & FD_RAW_INTR )){
1424                 inr = result();
1425                 cont->interrupt();
1426         } else if ( flags & FD_RAW_NEED_DISK )
1427                 fd_watchdog();
1428 }
1429 
1430 static int blind_seek;
1431 
1432 /*
1433  * This is the routine called after every seek (or recalibrate) interrupt
1434  * from the floppy controller.
1435  */
1436 static void seek_interrupt(void)
     /*  */
1437 {
1438 #ifdef DEBUGT
1439         debugt("seek interrupt:");
1440 #endif
1441         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1442                 DPRINT("seek failed\n");
1443                 DRS->track = NEED_2_RECAL;
1444                 cont->error();
1445                 cont->redo();
1446                 return;
1447         }
1448         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1449 #ifdef DCL_DEBUG
1450                 if (DP->flags & FD_DEBUG){
1451                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1452                         DPRINT1("jiffies=%ld\n", jiffies);
1453                 }
1454 #endif
1455                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1456                 DRS->select_date = jiffies;
1457         }
1458         DRS->track = ST1;
1459         floppy_ready();
1460 }
1461 
1462 static void check_wp(void)
     /*  */
1463 {
1464         if (TESTF(FD_VERIFY)) {
1465                 /* check write protection */
1466                 output_byte( FD_GETSTATUS );
1467                 output_byte( UNIT(current_drive) );
1468                 if ( result() != 1 ){
1469                         FDCS->reset = 1;
1470                         return;
1471                 }
1472                 CLEARF(FD_VERIFY);
1473                 CLEARF(FD_NEED_TWADDLE);
1474 #ifdef DCL_DEBUG
1475                 if (DP->flags & FD_DEBUG){
1476                         DPRINT("checking whether disk is write protected\n");
1477                         DPRINT1("wp=%x\n",ST3 & 0x40);
1478                 }
1479 #endif
1480                 if (!( ST3  & 0x40))
1481                         SETF(FD_DISK_WRITABLE);
1482                 else
1483                         CLEARF(FD_DISK_WRITABLE);
1484         }
1485 }
1486 
1487 static void seek_floppy(void)
     /*  */
1488 {
1489         int track;
1490 
1491         blind_seek=0;
1492 
1493 #ifdef DCL_DEBUG
1494         if (DP->flags & FD_DEBUG){
1495                 DPRINT("calling disk change from seek\n");
1496         }
1497 #endif
1498 
1499         if (!TESTF(FD_DISK_NEWCHANGE) &&
1500             disk_change(current_drive) &&
1501             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1502                 /* the media changed flag should be cleared after the seek.
1503                  * If it isn't, this means that there is really no disk in
1504                  * the drive.
1505                  */
1506                 SETF(FD_DISK_CHANGED);
1507                 cont->done(0);
1508                 cont->redo();
1509                 return;
1510         }
1511         if ( DRS->track <= NEED_1_RECAL ){
1512                 recalibrate_floppy();
1513                 return;
1514         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1515                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1516                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1517                 /* we seek to clear the media-changed condition. Does anybody
1518                  * know a more elegant way, which works on all drives? */
1519                 if ( raw_cmd->track )
1520                         track = raw_cmd->track - 1;
1521                 else {
1522                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1523                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1524                                 blind_seek = 1;
1525                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1526                         }
1527                         track = 1;
1528                 }
1529         } else {
1530                 check_wp();
1531                 if (raw_cmd->track != DRS->track &&
1532                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1533                         track = raw_cmd->track;
1534                 else {
1535                         setup_rw_floppy();
1536                         return;
1537                 }
1538         }
1539 
1540         SET_INTR(seek_interrupt);
1541         output_byte(FD_SEEK);
1542         output_byte(UNIT(current_drive));
1543         LAST_OUT(track);
1544 #ifdef DEBUGT
1545         debugt("seek command:");
1546 #endif
1547 }
1548 
1549 static void recal_interrupt(void)
     /*  */
1550 {
1551 #ifdef DEBUGT
1552         debugt("recal interrupt:");
1553 #endif
1554         if (inr !=2 )
1555                 FDCS->reset = 1;
1556         else if (ST0 & ST0_ECE) {
1557                 switch(DRS->track){
1558                         case NEED_1_RECAL:
1559 #ifdef DEBUGT
1560                                 debugt("recal interrupt need 1 recal:");
1561 #endif
1562                                 /* after a second recalibrate, we still haven't
1563                                  * reached track 0. Probably no drive. Raise an
1564                                  * error, as failing immediately might upset
1565                                  * computers possessed by the Devil :-) */
1566                                 cont->error();
1567                                 cont->redo();
1568                                 return;
1569                         case NEED_2_RECAL:
1570 #ifdef DEBUGT
1571                                 debugt("recal interrupt need 2 recal:");
1572 #endif
1573                                 /* If we already did a recalibrate,
1574                                  * and we are not at track 0, this
1575                                  * means we have moved. (The only way
1576                                  * not to move at recalibration is to
1577                                  * be already at track 0.) Clear the
1578                                  * new change flag */
1579 #ifdef DCL_DEBUG
1580                                 if (DP->flags & FD_DEBUG){
1581                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1582                                 }
1583 #endif
1584 
1585                                 CLEARF(FD_DISK_NEWCHANGE);
1586                                 DRS->select_date = jiffies;
1587                                 /* fall through */
1588                         default:
1589 #ifdef DEBUGT
1590                                 debugt("recal interrupt default:");
1591 #endif
1592                                 /* Recalibrate moves the head by at
1593                                  * most 80 steps. If after one
1594                                  * recalibrate we don't have reached
1595                                  * track 0, this might mean that we
1596                                  * started beyond track 80.  Try
1597                                  * again.  */
1598                                 DRS->track = NEED_1_RECAL;
1599                                 break;
1600                 }
1601         } else
1602                 DRS->track = ST1;
1603         floppy_ready();
1604 }
1605 
1606 /*
1607  * Unexpected interrupt - Print as much debugging info as we can...
1608  * All bets are off...
1609  */
1610 static void unexpected_floppy_interrupt(void)
     /*  */
1611 {
1612         int i;
1613         if ( initialising )
1614                 return;
1615         if(print_unex){
1616                 DPRINT("unexpected interrupt\n");
1617                 if ( inr >= 0 )
1618                         for(i=0; i<inr; i++)
1619                                 printk("%d %x\n", i, reply_buffer[i] );
1620         }
1621         while(1){
1622                 output_byte(FD_SENSEI);
1623                 inr=result();
1624                 if ( inr != 2 )
1625                         break;
1626                 if(print_unex){
1627                         printk("sensei\n");
1628                         for(i=0; i<inr; i++)
1629                                 printk("%d %x\n", i, reply_buffer[i] );
1630                 }
1631         }
1632         FDCS->reset = 1;
1633 }
1634 
1635 struct tq_struct floppy_tq =
1636 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1637 
1638 /* interrupt handler */
1639 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1640 {
1641         void (*handler)(void) = DEVICE_INTR;
1642 
1643         lasthandler = handler;
1644         interruptjiffies = jiffies;
1645 
1646         floppy_enable_hlt();
1647         CLEAR_INTR;
1648         if ( fdc >= N_FDC || FDCS->address == -1){
1649                 /* we don't even know which FDC is the culprit */
1650                 printk("DOR0=%x\n", fdc_state[0].dor);
1651                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1652                 printk("handler=%p\n", handler);
1653                 is_alive("bizarre fdc");
1654                 return;
1655         }
1656         inr = result();
1657         if (!handler){
1658                 unexpected_floppy_interrupt();
1659                 is_alive("unexpected");
1660                 return;
1661         }
1662         if ( inr == 0 ){
1663                 do {
1664                         output_byte(FD_SENSEI);
1665                         inr = result();
1666                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1667         }
1668         floppy_tq.routine = (void *)(void *) handler;
1669         queue_task_irq(&floppy_tq, &tq_timer);
1670         is_alive("normal interrupt end");
1671 }
1672 
1673 static void recalibrate_floppy(void)
     /*  */
1674 {
1675 #ifdef DEBUGT
1676         debugt("recalibrate floppy:");
1677 #endif
1678         SET_INTR(recal_interrupt);
1679         output_byte(FD_RECALIBRATE);
1680         LAST_OUT(UNIT(current_drive));
1681 }
1682 
1683 /*
1684  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1685  */
1686 static void reset_interrupt(void)
     /*  */
1687 {
1688 #ifdef DEBUGT
1689         debugt("reset interrupt:");
1690 #endif
1691         /* fdc_specify();          reprogram fdc */
1692         result();               /* get the status ready for set_fdc */
1693         if ( FDCS->reset )
1694                 cont->error(); /* a reset just after a reset. BAD! */
1695         cont->redo();
1696 }
1697 
1698 /*
1699  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1700  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1701  */
1702 static void reset_fdc(void)
     /*  */
1703 {
1704         SET_INTR(reset_interrupt);
1705         FDCS->reset = 0;
1706         reset_fdc_info(0);
1707         if ( FDCS->version >= FDC_82077 )
1708                 fd_outb(0x80 | ( FDCS->dtr &3), FD_STATUS);
1709         else {
1710                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1711                 udelay(FD_RESET_DELAY);
1712                 fd_outb(FDCS->dor, FD_DOR);
1713         }
1714 }
1715 
1716 static void empty(void)
     /*  */
1717 {
1718 }
1719 
1720 void show_floppy(void)
     /*  */
1721 {
1722         int i;
1723 
1724         printk("\n");
1725         printk("floppy driver state\n");
1726         printk("-------------------\n");
1727         printk("now=%ld last interrupt=%d last called handler=%p\n",
1728                jiffies, interruptjiffies, lasthandler);
1729 
1730 
1731 #ifdef FLOPPY_SANITY_CHECK
1732         printk("timeout_message=%s\n", timeout_message);
1733         printk("last output bytes:\n");
1734         for(i=0; i < OLOGSIZE; i++)
1735                 printk("%2x %2x %ld\n",
1736                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1737                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1738                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1739         printk("last result at %d\n", resultjiffies);
1740         printk("last redo_fd_request at %d\n", lastredo);
1741         for(i=0; i<resultsize; i++){
1742                 printk("%2x ", reply_buffer[i]);
1743         }
1744         printk("\n");
1745 #endif
1746 
1747 #if 0
1748         for(i=0; i<N_FDC; i++){
1749                 if(FDCS->address != -1){
1750                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1751                         fd_outb(fdc_state[i].address+2, fdc_state[i].dor);
1752                         udelay(1000); /* maybe we'll catch an interrupt... */
1753                 }
1754         }
1755 #endif
1756         printk("status=%x\n", fd_inb(FD_STATUS));
1757         printk("fdc_busy=%d\n", fdc_busy);
1758         if( DEVICE_INTR)
1759                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1760         if(floppy_tq.sync)
1761                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1762         if(fd_timer.prev)
1763                 printk("fd_timer.function=%p\n", fd_timer.function);
1764         if(fd_timeout.prev){
1765                 printk("timer_table=%p\n",fd_timeout.function);
1766                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1767                 printk("now=%ld\n",jiffies);
1768         }
1769         printk("cont=%p\n", cont);
1770         printk("CURRENT=%p\n", CURRENT);
1771         printk("command_status=%d\n", command_status);
1772         printk("\n");
1773 }
1774 
1775 static void floppy_shutdown(void)
     /*  */
1776 {
1777         if(!initialising)
1778                 show_floppy();
1779         CLEAR_INTR;
1780         floppy_tq.routine = (void *)(void *) empty;
1781         del_timer( &fd_timer);
1782         sti();
1783 
1784         floppy_enable_hlt();
1785         fd_disable_dma();
1786         /* avoid dma going to a random drive after shutdown */
1787 
1788         if(!initialising)
1789                 DPRINT("floppy timeout\n");
1790         FDCS->reset = 1;
1791         if (cont){
1792                 cont->done(0);
1793                 cont->redo(); /* this will recall reset when needed */
1794         } else {
1795                 printk("no cont in shutdown!\n");
1796                 process_fd_request();
1797         }
1798         is_alive("floppy shutdown");
1799 }
1800 /*typedef void (*timeout_fn)(unsigned long);*/
1801 
1802 /* start motor, check media-changed condition and write protection */
1803 static int start_motor( void (*function)(void)  )
     /*  */
1804 {
1805         int mask, data;
1806 
1807         mask = 0xfc;
1808         data = UNIT(current_drive);
1809         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1810                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1811                         set_debugt();
1812                         /* no read since this drive is running */
1813                         DRS->first_read_date = 0;
1814                         /* note motor start time if motor is not yet running */
1815                         DRS->spinup_date = jiffies;
1816                         data |= (0x10 << UNIT(current_drive));
1817                 }
1818         } else
1819                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1820                         mask &= ~(0x10 << UNIT(current_drive));
1821 
1822         /* starts motor and selects floppy */
1823         del_timer(motor_off_timer + current_drive);
1824         set_dor( fdc, mask, data);
1825 
1826         /* wait_for_completion also schedules reset if needed. */
1827         return(wait_for_completion(DRS->select_date+DP->select_delay,
1828                                    (timeout_fn) function));
1829 }
1830 
1831 static void floppy_ready(void)
     /*  */
1832 {
1833         CHECK_RESET;
1834         if(start_motor(floppy_ready)) return;
1835         if(fdc_dtr()) return;
1836 
1837 #ifdef DCL_DEBUG
1838         if (DP->flags & FD_DEBUG){
1839                 DPRINT("calling disk change from floppy_ready\n");
1840         }
1841 #endif
1842 
1843         if(!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1844            disk_change(current_drive) &&
1845            !DP->select_delay)
1846                 twaddle(); /* this clears the dcl on certain drive/controller
1847                             * combinations */
1848 
1849         if ( raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1850                 perpendicular_mode();
1851                 fdc_specify(); /* must be done here because of hut, hlt ... */
1852                 seek_floppy();
1853         } else
1854                 setup_rw_floppy();
1855 }
1856 
1857 static void floppy_start(void)
     /*  */
1858 {
1859         reschedule_timeout(CURRENTD, "floppy start", 0);
1860 
1861         scandrives();
1862 #ifdef DCL_DEBUG
1863         if (DP->flags & FD_DEBUG){
1864                 DPRINT("setting NEWCHANGE in floppy_start\n");
1865         }
1866 #endif
1867         SETF(FD_DISK_NEWCHANGE);
1868         floppy_ready();
1869 }
1870 
1871 /*
1872  * ========================================================================
1873  * here ends the bottom half. Exported routines are:
1874  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1875  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1876  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1877  * and set_dor.
1878  * ========================================================================
1879  */
1880 /*
1881  * General purpose continuations.
1882  * ==============================
1883  */
1884 
1885 static void do_wakeup(void)
     /*  */
1886 {
1887         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1888         cont = 0;
1889         command_status += 2;
1890         wake_up(&command_done);
1891 }
1892 
1893 static struct cont_t wakeup_cont={
1894         empty,
1895         do_wakeup,
1896         empty,
1897         (done_f)empty
1898 };
1899 
1900 static int wait_til_done(void (*handler)(void ), int interruptible)
     /*  */
1901 {
1902         int ret;
1903 
1904         floppy_tq.routine = (void *)(void *) handler;
1905         queue_task(&floppy_tq, &tq_timer);
1906 
1907         cli();
1908         while(command_status < 2 && NO_SIGNAL){
1909                 is_alive("wait_til_done");
1910                 if(interruptible)
1911                         interruptible_sleep_on(&command_done);
1912                 else
1913                         sleep_on(&command_done);
1914         }
1915         if(command_status < 2){
1916                 floppy_shutdown();
1917                 sti();
1918                 process_fd_request();
1919                 return -EINTR;
1920         }
1921         sti();
1922 
1923         if ( FDCS->reset )
1924                 command_status = FD_COMMAND_ERROR;
1925         if ( command_status == FD_COMMAND_OKAY )
1926                 ret=0;
1927         else
1928                 ret=-EIO;
1929         command_status = FD_COMMAND_NONE;
1930         return ret;
1931 }
1932 
1933 static void generic_done(int result)
     /*  */
1934 {
1935         command_status = result;
1936         cont = &wakeup_cont;
1937 }
1938 
1939 static void generic_success(void)
     /*  */
1940 {
1941         cont->done(1);
1942 }
1943 
1944 static void generic_failure(void)
     /*  */
1945 {
1946         cont->done(0);
1947 }
1948 
1949 static void success_and_wakeup(void)
     /*  */
1950 {
1951         generic_success();
1952         cont->redo();
1953 }
1954 
1955 
1956 /*
1957  * formatting and rw support.
1958  * ==========================
1959  */
1960 
1961 static int next_valid_format(void)
     /*  */
1962 {
1963         int probed_format;
1964 
1965         probed_format = DRS->probed_format;
1966         while(1){
1967                 if ( probed_format >= 8 ||
1968                      ! DP->autodetect[probed_format] ){
1969                         DRS->probed_format = 0;
1970                         return 1;
1971                 }
1972                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1973                         DRS->probed_format = probed_format;
1974                         return 0;
1975                 }
1976                 probed_format++;
1977         }
1978 }
1979 
1980 static void bad_flp_intr(void)
     /*  */
1981 {
1982         if ( probing ){
1983                 DRS->probed_format++;
1984                 if ( !next_valid_format())
1985                         return;
1986         }
1987         (*errors)++;
1988         if (*errors > DRWE->badness)
1989                 DRWE->badness = *errors;
1990         if (*errors > DP->max_errors.abort)
1991                 cont->done(0);
1992         if (*errors > DP->max_errors.reset)
1993                 FDCS->reset = 1;
1994         else if (*errors > DP->max_errors.recal)
1995                 DRS->track = NEED_2_RECAL;
1996 }
1997 
1998 static void set_floppy(kdev_t device)
     /*  */
1999 {
2000         if (TYPE(device))
2001                 floppy = TYPE(device) + floppy_type;
2002         else
2003                 floppy = current_type[ DRIVE(device) ];
2004 }
2005 
2006 /*
2007  * formatting and support.
2008  * =======================
2009  */
2010 static void format_interrupt(void)
     /*  */
2011 {
2012         switch (interpret_errors()){
2013                 case 1:
2014                         cont->error();
2015                 case 2:
2016                         break;
2017                 case 0:
2018                         cont->done(1);
2019         }
2020         cont->redo();
2021 }
2022 
2023 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
2024 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
2025 #define CT(x) ( (x) | 0x40 )
2026 static void setup_format_params(int track)
     /*  */
2027 {
2028         struct fparm {
2029                 unsigned char track,head,sect,size;
2030         } *here = (struct fparm *)floppy_track_buffer;
2031         int il,n;
2032         int count,head_shift,track_shift;
2033 
2034         raw_cmd = &default_raw_cmd;
2035         raw_cmd->track = track;
2036 
2037         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2038                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
2039         raw_cmd->rate = floppy->rate & 0x3;
2040         raw_cmd->cmd_count = NR_F;
2041         COMMAND = FM_MODE(floppy,FD_FORMAT);
2042         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
2043         F_SIZECODE = FD_SIZECODE(floppy);
2044         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
2045         F_GAP = floppy->fmt_gap;
2046         F_FILL = FD_FILL_BYTE;
2047 
2048         raw_cmd->kernel_data = floppy_track_buffer;
2049         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2050 
2051         /* allow for about 30ms for data transport per track */
2052         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
2053 
2054         /* a ``cylinder'' is two tracks plus a little stepping time */
2055         track_shift = 2 * head_shift + 3;
2056 
2057         /* position of logical sector 1 on this track */
2058         n = (track_shift * format_req.track + head_shift * format_req.head )
2059                 % F_SECT_PER_TRACK;
2060 
2061         /* determine interleave */
2062         il = 1;
2063         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2064                 il++;
2065 
2066         /* initialize field */
2067         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2068                 here[count].track = format_req.track;
2069                 here[count].head = format_req.head;
2070                 here[count].sect = 0;
2071                 here[count].size = F_SIZECODE;
2072         }
2073         /* place logical sectors */
2074         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2075                 here[n].sect = count;
2076                 n = (n+il) % F_SECT_PER_TRACK;
2077                 if (here[n].sect) { /* sector busy, find next free sector */
2078                         ++n;
2079                         if (n>= F_SECT_PER_TRACK) {
2080                                 n-=F_SECT_PER_TRACK;
2081                                 while (here[n].sect) ++n;
2082                         }
2083                 }
2084         }
2085 }
2086 
2087 static void redo_format(void)
     /*  */
2088 {
2089         buffer_track = -1;
2090         setup_format_params(format_req.track << STRETCH(floppy));
2091         floppy_start();
2092 #ifdef DEBUGT
2093         debugt("queue format request");
2094 #endif
2095 }
2096 
2097 static struct cont_t format_cont={
2098         format_interrupt,
2099         redo_format,
2100         bad_flp_intr,
2101         generic_done };
2102 
2103 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /*  */
2104 {
2105         int ret;
2106         int drive=DRIVE(device);
2107 
2108         LOCK_FDC(drive,1);
2109         set_floppy(device);
2110         if (!floppy ||
2111             floppy->track > DP->tracks ||
2112             tmp_format_req->track >= floppy->track ||
2113             tmp_format_req->head >= floppy->head ||
2114             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2115             !floppy->fmt_gap) {
2116                 process_fd_request();
2117                 return -EINVAL;
2118         }
2119         format_req = *tmp_format_req;
2120         format_errors = 0;
2121         cont = &format_cont;
2122         errors = &format_errors;
2123         IWAIT(redo_format);
2124         process_fd_request();
2125         return ret;
2126 }
2127 
2128 /*
2129  * Buffer read/write and support
2130  * =============================
2131  */
2132 
2133 /* new request_done. Can handle physical sectors which are smaller than a
2134  * logical buffer */
2135 static void request_done(int uptodate)
     /*  */
2136 {
2137         int block;
2138 
2139         probing = 0;
2140         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2141 
2142         if (!CURRENT){
2143                 DPRINT("request list destroyed in floppy request done\n");
2144                 return;
2145         }
2146         if (uptodate){
2147                 /* maintain values for invalidation on geometry
2148                  * change */
2149                 block = current_count_sectors + CURRENT->sector;
2150                 if (block > DRS->maxblock)
2151                         DRS->maxblock=block;
2152                 if ( block > floppy->sect)
2153                         DRS->maxtrack = 1;
2154 
2155                 /* unlock chained buffers */
2156                 while (current_count_sectors && CURRENT &&
2157                        current_count_sectors >= CURRENT->current_nr_sectors ){
2158                         current_count_sectors -= CURRENT->current_nr_sectors;
2159                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2160                         CURRENT->sector += CURRENT->current_nr_sectors;
2161                         end_request(1);
2162                 }
2163                 if ( current_count_sectors && CURRENT){
2164                         /* "unlock" last subsector */
2165                         CURRENT->buffer += current_count_sectors <<9;
2166                         CURRENT->current_nr_sectors -= current_count_sectors;
2167                         CURRENT->nr_sectors -= current_count_sectors;
2168                         CURRENT->sector += current_count_sectors;
2169                         return;
2170                 }
2171 
2172                 if ( current_count_sectors && ! CURRENT )
2173                         DPRINT("request list destroyed in floppy request done\n");
2174 
2175         } else {
2176                 if(CURRENT->cmd == WRITE) {
2177                         /* record write error information */
2178                         DRWE->write_errors++;
2179                         if(DRWE->write_errors == 1) {
2180                                 DRWE->first_error_sector = CURRENT->sector;
2181                                 DRWE->first_error_generation = DRS->generation;
2182                         }
2183                         DRWE->last_error_sector = CURRENT->sector;
2184                         DRWE->last_error_generation = DRS->generation;
2185                 }
2186                 end_request(0);
2187         }
2188 }
2189 
2190 /* Interrupt handler evaluating the result of the r/w operation */
2191 static void rw_interrupt(void)
     /*  */
2192 {
2193         int nr_sectors, ssize;
2194 
2195         if ( ! DRS->first_read_date )
2196                 DRS->first_read_date = jiffies;
2197 
2198         nr_sectors = 0;
2199         CODE2SIZE;
2200         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2201                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2202                 (sector_t % floppy->sect) % ssize;
2203 
2204 #ifdef FLOPPY_SANITY_CHECK
2205         if ( nr_sectors > current_count_sectors + ssize -
2206              (current_count_sectors + sector_t) % ssize +
2207              sector_t % ssize){
2208                 DPRINT2("long rw: %x instead of %lx\n",
2209                         nr_sectors, current_count_sectors);
2210                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2211                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2212                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2213                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2214                        sector_t, ssize);
2215         }
2216 #endif
2217         if ( nr_sectors < 0 )
2218                 nr_sectors = 0;
2219         if ( nr_sectors < current_count_sectors )
2220                 current_count_sectors = nr_sectors;
2221 
2222         switch (interpret_errors()){
2223                 case 2:
2224                         cont->redo();
2225                         return;
2226                 case 1:
2227                         if (  !current_count_sectors){
2228                                 cont->error();
2229                                 cont->redo();
2230                                 return;
2231                         }
2232                         break;
2233                 case 0:
2234                         if (  !current_count_sectors){
2235                                 cont->redo();
2236                                 return;
2237                         }
2238                         current_type[current_drive] = floppy;
2239                         floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
2240                         break;
2241         }
2242 
2243         if (probing) {
2244                 if (DP->flags & FTD_MSG)
2245                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2246                                 floppy->name,current_drive);
2247                 current_type[current_drive] = floppy;
2248                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2249                 probing = 0;
2250         }
2251 
2252         if ( CT(COMMAND) != FD_READ || 
2253              raw_cmd->kernel_data == CURRENT->buffer ){
2254                 /* transfer directly from buffer */
2255                 cont->done(1);
2256         } else if ( CT(COMMAND) == FD_READ){
2257                 buffer_track = raw_cmd->track;
2258                 buffer_drive = current_drive;
2259                 if ( nr_sectors + sector_t > buffer_max )
2260                         buffer_max = nr_sectors + sector_t;
2261         }
2262         cont->redo();
2263 }
2264 
2265 /* Compute maximal contiguous buffer size. */
2266 static int buffer_chain_size(void)
     /*  */
2267 {
2268         struct buffer_head *bh;
2269         int size;
2270         char *base;
2271 
2272         base = CURRENT->buffer;
2273         size = CURRENT->current_nr_sectors << 9;
2274         bh = CURRENT->bh;
2275 
2276         if (bh){
2277                 bh = bh->b_reqnext;
2278                 while ( bh && bh->b_data == base + size ){
2279                         size += bh->b_size;
2280                         bh = bh->b_reqnext;
2281                 }
2282         }
2283         return size >> 9;
2284 }
2285 
2286 /* Compute the maximal transfer size */
2287 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2288 {
2289         if ( max_sector > sector_t + max_size)
2290                 max_sector = sector_t + max_size;
2291 
2292         /* alignment */
2293         max_sector -= (max_sector % floppy->sect ) % ssize;
2294 
2295         /* transfer size, beginning not aligned */
2296         current_count_sectors = max_sector - sector_t ;
2297 
2298         return max_sector;
2299 }
2300 
2301 /*
2302  * Move data from/to the track buffer to/from the buffer cache.
2303  */
2304 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2305 {
2306         int remaining; /* number of transferred 512-byte sectors */
2307         struct buffer_head *bh;
2308         char *buffer, *dma_buffer;
2309         int size;
2310 
2311         if ( max_sector > max_sector_2 )
2312                 max_sector = max_sector_2;
2313 
2314         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2315 
2316         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2317             buffer_max > sector_t + CURRENT->nr_sectors){
2318                 current_count_sectors = buffer_max - sector_t;
2319                 if ( current_count_sectors > CURRENT->nr_sectors )
2320                         current_count_sectors = CURRENT->nr_sectors;
2321         }
2322         remaining = current_count_sectors << 9;
2323 #ifdef FLOPPY_SANITY_CHECK
2324         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2325             CT(COMMAND) == FD_WRITE ){
2326                 DPRINT("in copy buffer\n");
2327                 printk("current_count_sectors=%ld\n", current_count_sectors);
2328                 printk("remaining=%d\n", remaining >> 9);
2329                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2330                 printk("CURRENT->current_nr_sectors=%ld\n",
2331                        CURRENT->current_nr_sectors);
2332                 printk("max_sector=%d\n", max_sector);
2333                 printk("ssize=%d\n", ssize);
2334         }
2335 #endif
2336 
2337         if ( max_sector > buffer_max )
2338                 buffer_max = max_sector;
2339 
2340         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2341 
2342         bh = CURRENT->bh;
2343         size = CURRENT->current_nr_sectors << 9;
2344         buffer = CURRENT->buffer;
2345 
2346         while ( remaining > 0){
2347                 if ( size > remaining )
2348                         size = remaining;
2349 #ifdef FLOPPY_SANITY_CHECK
2350                 if (dma_buffer + size >
2351                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2352                     dma_buffer < floppy_track_buffer ){
2353                         DPRINT1("buffer overrun in copy buffer %d\n",
2354                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2355                         printk("sector_t=%d buffer_min=%d\n",
2356                                sector_t, buffer_min);
2357                         printk("current_count_sectors=%ld\n",
2358                                current_count_sectors);
2359                         if ( CT(COMMAND) == FD_READ )
2360                                 printk("read\n");
2361                         if ( CT(COMMAND) == FD_READ )
2362                                 printk("write\n");
2363                         break;
2364                 }
2365                 if ( ((unsigned long)buffer) % 512 )
2366                         DPRINT1("%p buffer not aligned\n", buffer);
2367 #endif
2368                 if ( CT(COMMAND) == FD_READ ) {
2369                         fd_cacheflush(dma_buffer, size);
2370                         memcpy( buffer, dma_buffer, size);
2371                 }       
2372                 else {
2373                         memcpy( dma_buffer, buffer, size);
2374                         fd_cacheflush(dma_buffer, size);
2375                 }       
2376                 remaining -= size;
2377                 if ( !remaining)
2378                         break;
2379 
2380                 dma_buffer += size;
2381                 bh = bh->b_reqnext;
2382 #ifdef FLOPPY_SANITY_CHECK
2383                 if ( !bh){
2384                         DPRINT("bh=null in copy buffer after copy\n");
2385                         break;
2386                 }
2387 #endif
2388                 size = bh->b_size;
2389                 buffer = bh->b_data;
2390         }
2391 #ifdef FLOPPY_SANITY_CHECK
2392         if ( remaining ){
2393                 if ( remaining > 0 )
2394                         max_sector -= remaining >> 9;
2395                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2396         }
2397 #endif
2398 }
2399 
2400 /*
2401  * Formulate a read/write request.
2402  * this routine decides where to load the data (directly to buffer, or to
2403  * tmp floppy area), how much data to load (the size of the buffer, the whole
2404  * track, or a single sector)
2405  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2406  * allocation on the fly, it should be done here. No other part should need
2407  * modification.
2408  */
2409 
2410 static int make_raw_rw_request(void)
     /*  */
2411 {
2412         int aligned_sector_t;
2413         int max_sector, max_size, tracksize, ssize;
2414 
2415         set_fdc(DRIVE(CURRENT->rq_dev));
2416 
2417         raw_cmd = &default_raw_cmd;
2418         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2419                 FD_RAW_NEED_SEEK;
2420         raw_cmd->cmd_count = NR_RW;
2421         if (CURRENT->cmd == READ){
2422                 raw_cmd->flags |= FD_RAW_READ;
2423                 COMMAND = FM_MODE(floppy,FD_READ);
2424         } else if (CURRENT->cmd == WRITE){
2425                 raw_cmd->flags |= FD_RAW_WRITE;
2426                 COMMAND = FM_MODE(floppy,FD_WRITE);
2427         } else {
2428                 DPRINT("make_raw_rw_request: unknown command\n");
2429                 return 0;
2430         }
2431 
2432         max_sector = floppy->sect * floppy->head;
2433 
2434         TRACK = CURRENT->sector / max_sector;
2435         sector_t = CURRENT->sector % max_sector;
2436         if ( floppy->track && TRACK >= floppy->track )
2437                 return 0;
2438         HEAD = sector_t / floppy->sect;
2439 
2440         if (((floppy->stretch & FD_SWAPSIDES) || TESTF( FD_NEED_TWADDLE)) &&
2441             sector_t < floppy->sect )
2442                 max_sector = floppy->sect;
2443 
2444         /* 2M disks have phantom sectors on the first track */
2445         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2446                 max_sector = 2 * floppy->sect / 3;
2447                 if (sector_t >= max_sector){
2448                         current_count_sectors =  (floppy->sect - sector_t);
2449                         if ( current_count_sectors > CURRENT->nr_sectors )
2450                                 current_count_sectors = CURRENT->nr_sectors;
2451                         return 1;
2452                 }
2453                 SIZECODE = 2;
2454         } else
2455                 SIZECODE = FD_SIZECODE(floppy);
2456         raw_cmd->rate = floppy->rate & 3;
2457         if ((floppy->rate & FD_2M) &&
2458             (TRACK || HEAD ) &&
2459             raw_cmd->rate == 2)
2460                 raw_cmd->rate = 1;
2461 
2462         if ( SIZECODE )
2463                 SIZECODE2 = 0xff;
2464         else
2465                 SIZECODE2 = 0x80;
2466         raw_cmd->track = TRACK << STRETCH(floppy);
2467         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2468         GAP = floppy->gap;
2469         CODE2SIZE;
2470         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2471         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2472         tracksize = floppy->sect - floppy->sect % ssize;
2473         if ( tracksize < floppy->sect ){
2474                 SECT_PER_TRACK ++;
2475                 if (  tracksize <= sector_t % floppy->sect)
2476                         SECTOR--;
2477                 while ( tracksize <= sector_t % floppy->sect){
2478                         while( tracksize + ssize > floppy->sect ){
2479                                 SIZECODE--;
2480                                 ssize >>= 1;
2481                         }
2482                         SECTOR++; SECT_PER_TRACK ++;
2483                         tracksize += ssize;
2484                 }
2485                 max_sector = HEAD * floppy->sect + tracksize;
2486         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2487                 max_sector = floppy->sect;
2488 
2489         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2490         max_size = CURRENT->nr_sectors;
2491         if ((raw_cmd->track == buffer_track) && (current_drive == buffer_drive) &&
2492             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2493                 /* data already in track buffer */
2494                 if (CT(COMMAND) == FD_READ) {
2495                         copy_buffer(1, max_sector, buffer_max);
2496                         return 1;
2497                 }
2498         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2499                 if (CT(COMMAND) == FD_WRITE){
2500                         if(sector_t + CURRENT->nr_sectors > ssize &&
2501                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2502                                 max_size = ssize + ssize;
2503                         else
2504                                 max_size = ssize;
2505                 }
2506                 raw_cmd->flags &= ~FD_RAW_WRITE;
2507                 raw_cmd->flags |= FD_RAW_READ;
2508                 COMMAND = FM_MODE(floppy,FD_READ);
2509         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS ) {
2510                 int direct, indirect;
2511 
2512                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2513                         sector_t;
2514 
2515                 max_size = buffer_chain_size();
2516                 if ( max_size > ( MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9)
2517                         max_size=(MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9;
2518                 /* 64 kb boundaries */
2519                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2520                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2521                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2522                 /*
2523                  * We try to read tracks, but if we get too many errors, we
2524                  * go back to reading just one sector at a time.
2525                  *
2526                  * This means we should be able to read a sector even if there
2527                  * are other bad sectors on this track.
2528                  */
2529                 if (!direct ||
2530                     (indirect * 2 > direct * 3 &&
2531                      *errors < DP->max_errors.read_track &&
2532                      /*!TESTF( FD_NEED_TWADDLE) &&*/
2533                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2534                         max_size = CURRENT->nr_sectors;
2535                 } else {
2536                         raw_cmd->kernel_data = CURRENT->buffer;
2537                         raw_cmd->length = current_count_sectors << 9;
2538                         if (raw_cmd->length == 0){
2539                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2540                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2541                                         indirect, direct, sector_t);
2542                                 return 0;
2543                         }
2544                         return 2;
2545                 }
2546         }
2547 
2548         if ( CT(COMMAND) == FD_READ )
2549                 max_size = max_sector; /* unbounded */
2550 
2551         /* claim buffer track if needed */
2552         if (buffer_track != raw_cmd->track ||  /* bad track */
2553             buffer_drive !=current_drive || /* bad drive */
2554             sector_t > buffer_max ||
2555             sector_t < buffer_min ||
2556             ((CT(COMMAND) == FD_READ ||
2557               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2558              max_sector > 2 * max_buffer_sectors + buffer_min &&
2559              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2560             /* not enough space */ ){
2561                 buffer_track = -1;
2562                 buffer_drive = current_drive;
2563                 buffer_max = buffer_min = aligned_sector_t;
2564         }
2565         raw_cmd->kernel_data = floppy_track_buffer + 
2566                 ((aligned_sector_t-buffer_min )<<9);
2567 
2568         if ( CT(COMMAND) == FD_WRITE ){
2569                 /* copy write buffer to track buffer.
2570                  * if we get here, we know that the write
2571                  * is either aligned or the data already in the buffer
2572                  * (buffer will be overwritten) */
2573 #ifdef FLOPPY_SANITY_CHECK
2574                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2575                         DPRINT("internal error offset !=0 on write\n");
2576 #endif
2577                 buffer_track = raw_cmd->track;
2578                 buffer_drive = current_drive;
2579                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2580         } else
2581                 transfer_size(ssize, max_sector,
2582                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2583 
2584         /* round up current_count_sectors to get dma xfer size */
2585         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2586         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2587         raw_cmd->length <<= 9;
2588 #ifdef FLOPPY_SANITY_CHECK
2589         if ((raw_cmd->length < current_count_sectors << 9) ||
2590             (raw_cmd->kernel_data != CURRENT->buffer &&
2591              CT(COMMAND) == FD_WRITE &&
2592              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2593               aligned_sector_t < buffer_min )) ||
2594             raw_cmd->length % ( 128 << SIZECODE ) ||
2595             raw_cmd->length <= 0 || current_count_sectors <= 0){
2596                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2597                         raw_cmd->length, current_count_sectors);
2598                 if ( raw_cmd->kernel_data != CURRENT->buffer )
2599                         printk("addr=%d, length=%ld\n",
2600                                (int) ((raw_cmd->kernel_data - 
2601                                        floppy_track_buffer ) >> 9),
2602                                current_count_sectors);
2603                 printk("st=%d ast=%d mse=%d msi=%d\n",
2604                        sector_t, aligned_sector_t, max_sector, max_size);
2605                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2606                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2607                        COMMAND, SECTOR, HEAD, TRACK);
2608                 printk("buffer drive=%d\n", buffer_drive);
2609                 printk("buffer track=%d\n", buffer_track);
2610                 printk("buffer_min=%d\n", buffer_min );
2611                 printk("buffer_max=%d\n", buffer_max );
2612                 return 0;
2613         }
2614 
2615         if (raw_cmd->kernel_data != CURRENT->buffer ){
2616                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2617                     current_count_sectors < 0 ||
2618                     raw_cmd->length < 0 ||
2619                     raw_cmd->kernel_data + raw_cmd->length >
2620                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2621                         DPRINT("buffer overrun in schedule dma\n");
2622                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2623                                sector_t, buffer_min,
2624                                raw_cmd->length >> 9 );
2625                         printk("current_count_sectors=%ld\n",
2626                                current_count_sectors);
2627                         if ( CT(COMMAND) == FD_READ )
2628                                 printk("read\n");
2629                         if ( CT(COMMAND) == FD_READ )
2630                                 printk("write\n");
2631                         return 0;
2632                 }
2633         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2634                    current_count_sectors > CURRENT->nr_sectors){
2635                 DPRINT("buffer overrun in direct transfer\n");
2636                 return 0;
2637         } else if ( raw_cmd->length < current_count_sectors << 9 ){
2638                 DPRINT("more sectors than bytes\n");
2639                 printk("bytes=%ld\n", raw_cmd->length >> 9 );
2640                 printk("sectors=%ld\n", current_count_sectors);
2641         }
2642         if (raw_cmd->length == 0){
2643                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2644                 return 0;
2645         }
2646 #endif
2647         return 2;
2648 }
2649 
2650 static void redo_fd_request(void)
     /*  */
2651 {
2652 #define REPEAT {request_done(0); continue; }
2653         kdev_t device;
2654         int tmp;
2655 
2656         lastredo = jiffies;
2657         if (current_drive < N_DRIVE)
2658                 floppy_off(current_drive);
2659 
2660         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2661                 DPRINT("current not active!\n");
2662                 return;
2663         }
2664 
2665         while(1){
2666                 if (!CURRENT) {
2667                         CLEAR_INTR;
2668                         unlock_fdc();
2669                         return;
2670                 }
2671                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2672                         panic(DEVICE_NAME ": request list destroyed");
2673                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2674                         panic(DEVICE_NAME ": block not locked");
2675 
2676                 device = CURRENT->rq_dev;
2677                 set_fdc(DRIVE(device));
2678                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2679 
2680                 set_floppy(device);
2681                 raw_cmd = & default_raw_cmd;
2682                 raw_cmd->flags = 0;
2683                 if(start_motor(redo_fd_request)) return;
2684                 if(test_bit(current_drive, &fake_change) ||
2685                    TESTF(FD_DISK_CHANGED)){
2686                         DPRINT("disk absent or changed during operation\n");
2687                         REPEAT;
2688                 }
2689                 if (!floppy) { /* Autodetection */
2690                         if (!probing){
2691                                 DRS->probed_format = 0;
2692                                 if ( next_valid_format() ){
2693                                         DPRINT("no autodetectable formats\n");
2694                                         floppy = NULL;
2695                                         REPEAT;
2696                                 }
2697                         }
2698                         probing = 1;
2699                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2700                 } else
2701                         probing = 0;
2702                 errors = & (CURRENT->errors);
2703                 tmp = make_raw_rw_request();
2704                 if ( tmp < 2 ){
2705                         request_done(tmp);
2706                         continue;
2707                 }
2708 
2709                 if (TESTF(FD_NEED_TWADDLE))
2710                         twaddle();
2711                 floppy_tq.routine = (void *)(void *) floppy_start;
2712                 queue_task(&floppy_tq, &tq_timer);
2713 #ifdef DEBUGT
2714                 debugt("queue fd request");
2715 #endif
2716                 return;
2717         }
2718 #undef REPEAT
2719 }
2720 
2721 static struct cont_t rw_cont={
2722         rw_interrupt,
2723         redo_fd_request,
2724         bad_flp_intr,
2725         request_done };
2726 
2727 struct tq_struct request_tq =
2728 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2729 
2730 static void process_fd_request(void)
     /*  */
2731 {
2732         cont = &rw_cont;
2733         queue_task(&request_tq, &tq_timer);
2734 }
2735 
2736 static void do_fd_request(void)
     /*  */
2737 {
2738         if (fdc_busy){
2739                 /* fdc busy, this new request will be treated when the
2740                    current one is done */
2741                 is_alive("do fd request, old request running");
2742                 return;
2743         }
2744         /* fdc_busy cannot be set by an interrupt or a bh */
2745         floppy_grab_irq_and_dma();
2746         fdc_busy=1;
2747         reschedule_timeout(MAXTIMEOUT, "do fd request",0);
2748         process_fd_request();
2749         is_alive("do fd request");
2750 }
2751 
2752 static struct cont_t poll_cont={
2753         success_and_wakeup,
2754         floppy_ready,
2755         generic_failure,
2756         generic_done };
2757 
2758 static int poll_drive(int interruptible, int flag)
     /*  */
2759 {
2760         int ret;
2761         /* no auto-sense, just clear dcl */
2762         raw_cmd = &default_raw_cmd;
2763         raw_cmd->flags= flag;
2764         raw_cmd->track=0;
2765         raw_cmd->cmd_count=0;
2766         cont = &poll_cont;
2767 #ifdef DCL_DEBUG
2768         if (DP->flags & FD_DEBUG){
2769                 DPRINT("setting NEWCHANGE in poll_drive\n");
2770         }
2771 #endif
2772         SETF(FD_DISK_NEWCHANGE);
2773         WAIT(floppy_ready);
2774         return ret;
2775 }
2776 
2777 /*
2778  * User triggered reset
2779  * ====================
2780  */
2781 
2782 static void reset_intr(void)
     /*  */
2783 {
2784         printk("weird, reset interrupt called\n");
2785 }
2786 
2787 static struct cont_t reset_cont={
2788         reset_intr,
2789         success_and_wakeup,
2790         generic_failure,
2791         generic_done };
2792 
2793 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2794 {
2795         int ret;
2796 
2797         ret=0;
2798         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2799                 return 0;
2800         LOCK_FDC(drive,interruptible);
2801         if(arg == FD_RESET_ALWAYS)
2802                 FDCS->reset=1;
2803         if ( FDCS->reset ){
2804                 cont = &reset_cont;
2805                 reschedule_timeout(CURRENTD, "user reset fdc", 0);
2806                 WAIT(reset_fdc);
2807         }
2808         process_fd_request();
2809         return ret;
2810 }
2811 
2812 /*
2813  * Misc Ioctl's and support
2814  * ========================
2815  */
2816 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2817 {
2818         int i;
2819 
2820         i = verify_area(VERIFY_WRITE,param,size);
2821         if (i)
2822                 return i;
2823         fd_cacheflush(address, size);           /* is this necessary ??? */
2824                         /* Ralf: Yes; only the l2 cache is completly chipset
2825                            controlled */
2826         memcpy_tofs(param,(void *) address, size);
2827         return 0;
2828 }
2829 
2830 static int fd_copyin(void *param, volatile void *address, int size)
     /*  */
2831 {
2832         int i;
2833 
2834         i = verify_area(VERIFY_READ,param,size);
2835         if (i)
2836                 return i;
2837         memcpy_fromfs((void *) address, param, size);
2838         return 0;
2839 }
2840 
2841 #define COPYOUT(x) ECALL(fd_copyout( (void *)param, &(x), sizeof(x)))
2842 #define COPYIN(x) ECALL(fd_copyin( (void *)param, &(x), sizeof(x)))
2843 
2844 static const char *drive_name(int type, int drive )
     /*  */
2845 {
2846         struct floppy_struct *floppy;
2847 
2848         if ( type )
2849                 floppy = floppy_type + type;
2850         else {
2851                 if ( UDP->native_format )
2852                         floppy = floppy_type + UDP->native_format;
2853                 else
2854                         return "(null)";
2855         }
2856         if ( floppy->name )
2857                 return floppy->name;
2858         else
2859                 return "(null)";
2860 }
2861 
2862 
2863 /* raw commands */
2864 static void raw_cmd_done(int flag)
     /*  */
2865 {
2866         int i;
2867 
2868         if(!flag) {
2869                 raw_cmd->flags = FD_RAW_FAILURE;
2870                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2871         } else {
2872                 raw_cmd->reply_count = inr;
2873                 for( i=0; i< raw_cmd->reply_count; i++)
2874                         raw_cmd->reply[i] = reply_buffer[i];
2875 
2876                 if ( raw_cmd->flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2877                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2878                 
2879                 if( (raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2880                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2881                         raw_cmd->flags |= FD_RAW_FAILURE;
2882 
2883                 if( disk_change(current_drive) )
2884                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2885                 else
2886                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2887                 if(raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2888                         motor_off_callback(current_drive);
2889 
2890                 if(raw_cmd->next &&
2891                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2892                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2893                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2894                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2895                         raw_cmd = raw_cmd->next;
2896                         return;
2897                 }
2898         }
2899         generic_done(flag);
2900 }
2901 
2902 
2903 static struct cont_t raw_cmd_cont={
2904         success_and_wakeup,
2905         floppy_start,
2906         generic_failure,
2907         raw_cmd_done
2908 };
2909 
2910 static inline int raw_cmd_copyout(int cmd, char *param,
     /*  */
2911                                   struct floppy_raw_cmd *ptr)
2912 {
2913         struct old_floppy_raw_cmd old_raw_cmd;
2914         int ret;
2915 
2916         while(ptr) {
2917                 if(cmd == OLDFDRAWCMD) {
2918                         old_raw_cmd.flags = ptr->flags;
2919                         old_raw_cmd.data = ptr->data;
2920                         old_raw_cmd.length = ptr->length;
2921                         old_raw_cmd.rate = ptr->rate;
2922                         old_raw_cmd.reply_count = ptr->reply_count;
2923                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2924                         COPYOUT(old_raw_cmd);
2925                         param += sizeof(old_raw_cmd);
2926                 } else {
2927                         COPYOUT(*ptr);
2928                         param += sizeof(struct floppy_raw_cmd);
2929                 }
2930 
2931                 if ( (ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2932                         if(ptr->length>=0 && ptr->length<=ptr->buffer_length)
2933                                 ECALL(fd_copyout(ptr->data, 
2934                                                  ptr->kernel_data, 
2935                                                  ptr->buffer_length - 
2936                                                  ptr->length));
2937                 }
2938                 ptr = ptr->next;
2939         }
2940         return 0;
2941 }
2942 
2943 
2944 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /*  */
2945 {
2946         struct floppy_raw_cmd **next;
2947 
2948         while(*ptr) {
2949                 next = & (*ptr)->next;
2950                 if((*ptr)->buffer_length) {
2951                         free_pages((unsigned long)(*ptr)->kernel_data,
2952                                    __get_order((*ptr)->buffer_length));
2953                         (*ptr)->buffer_length = 0;
2954                 }
2955                 kfree(*ptr);
2956                 *ptr = 0;
2957                 ptr = next;
2958         }
2959 }
2960 
2961 
2962 static inline int raw_cmd_copyin(int cmd, char *param,
     /*  */
2963                                  struct floppy_raw_cmd **rcmd)
2964 {
2965         struct floppy_raw_cmd *ptr;
2966         struct old_floppy_raw_cmd old_raw_cmd;
2967         int ret;
2968         int i;
2969         
2970         *rcmd = 0;
2971         while(1) {
2972                 ptr = (struct floppy_raw_cmd *) 
2973                         kmalloc(sizeof(struct floppy_raw_cmd ), GFP_USER);
2974                 if(!ptr)
2975                         return -ENOMEM;
2976                 ptr->next = 0;
2977                 ptr->buffer_length = 0;
2978                 *rcmd = ptr;
2979                 if(cmd == OLDFDRAWCMD){
2980                         COPYIN(old_raw_cmd);
2981                         ptr->flags = old_raw_cmd.flags;
2982                         ptr->data = old_raw_cmd.data;
2983                         ptr->length = old_raw_cmd.length;
2984                         ptr->rate = old_raw_cmd.rate;
2985                         ptr->cmd_count = old_raw_cmd.cmd_count;
2986                         ptr->track = old_raw_cmd.track;
2987                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
2988                         if(ptr->cmd_count > 9)
2989                                 return -EINVAL;                 
2990                         ptr->next = 0;
2991                         ptr->phys_length = 0;
2992                         param += sizeof(struct old_floppy_raw_cmd);
2993                 } else {
2994                         COPYIN(*ptr);
2995                         param += sizeof(struct floppy_raw_cmd);
2996                         if(ptr->cmd_count > 16)
2997                                 return -EINVAL;
2998                 }
2999 
3000                 for(i=0; i< 16; i++)
3001                         ptr->reply[i] = 0;
3002                 ptr->resultcode = 0;
3003 
3004                 ptr->next = 0;
3005                 ptr->buffer_length = 0;
3006                 ptr->kernel_data = 0;
3007 
3008                 if(ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3009                         if(!ptr->length)
3010                                 return -EINVAL;
3011 
3012                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
3013                         if(!ptr->kernel_data)
3014                                 return -ENOMEM;
3015                         ptr->buffer_length = ptr->length;
3016                 }
3017                 if(ptr->flags & FD_RAW_WRITE)
3018                         fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3019                 rcmd = & (ptr->next);
3020                 if( ! (ptr->flags & FD_RAW_MORE))
3021                         return 0;
3022                 ptr->rate &= 0x03;
3023 
3024         }
3025 }
3026 
3027 
3028 static int raw_cmd_ioctl(int cmd, void *param)
     /*  */
3029 {
3030         int drive, ret, ret2;
3031         struct floppy_raw_cmd *my_raw_cmd;
3032 
3033         if ( FDCS->rawcmd <= 1 )
3034                 FDCS->rawcmd = 1;
3035         for ( drive= 0; drive < N_DRIVE; drive++){
3036                 if ( FDC(drive) != fdc)
3037                         continue;
3038                 if ( drive == current_drive ){
3039                         if ( UDRS->fd_ref > 1 ){
3040                                 FDCS->rawcmd = 2;
3041                                 break;
3042                         }
3043                 } else if ( UDRS->fd_ref ){
3044                         FDCS->rawcmd = 2;
3045                         break;
3046                 }
3047         }
3048 
3049         if(FDCS->reset)
3050                 return -EIO;
3051 
3052         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3053         if(ret) {
3054                 raw_cmd_free(&my_raw_cmd);
3055                 return ret;
3056         }
3057 
3058         raw_cmd = my_raw_cmd;
3059         cont = &raw_cmd_cont;
3060         ret=wait_til_done(floppy_start,1);
3061 #ifdef DCL_DEBUG
3062         if (DP->flags & FD_DEBUG){
3063                 DPRINT("calling disk change from raw_cmd ioctl\n");
3064         }
3065 #endif
3066 
3067         if(ret != -EINTR && FDCS->reset)
3068                 ret = -EINTR;
3069 
3070         DRS->track = NO_TRACK;
3071 
3072         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3073         if(!ret)
3074                 ret = ret2;
3075         raw_cmd_free(&my_raw_cmd);
3076         return ret;
3077 }
3078 
3079 static int invalidate_drive(kdev_t rdev)
     /*  */
3080 {
3081         /* invalidate the buffer track to force a reread */
3082         set_bit( DRIVE(rdev), &fake_change);
3083         process_fd_request();
3084         check_disk_change(rdev);
3085         return 0;
3086 }
3087 
3088 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
3089                     unsigned long param)
3090 {
3091 #define IOCTL_MODE_BIT 8
3092 #define OPEN_WRITE_BIT 16
3093 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3094 
3095         struct floppy_struct newparams;
3096         struct format_descr tmp_format_req;
3097         int i,drive,type,cnt;
3098         kdev_t device;
3099         struct floppy_struct *this_floppy;
3100         const char *name;
3101         int ret;
3102 
3103         device = inode->i_rdev;
3104         switch (cmd) {
3105                 RO_IOCTLS(device,param);
3106         }
3107         type = TYPE(device);
3108         drive = DRIVE(device);
3109         switch (cmd) {
3110                 case OLDFDGETDRVTYP:
3111                 case FDGETDRVTYP:
3112                         i=verify_area(VERIFY_WRITE,(void *) param,16);
3113                         if (i)
3114                                 return i;
3115                         name = drive_name(type,drive);
3116                         for ( cnt=0; cnt<16; cnt++){
3117                                 put_user(name[cnt], ((char*)param)+cnt);
3118                                 if ( ! *name )
3119                                         break;
3120                         }
3121                         return 0;
3122                 case OLDFDGETMAXERRS:
3123                 case FDGETMAXERRS:
3124                         COPYOUT(UDP->max_errors);
3125                         return 0;
3126                 case OLDFDGETPRM:
3127                 case FDGETPRM:
3128                         if (type)
3129                                 this_floppy = &floppy_type[type];
3130                         else if ((this_floppy = current_type[drive]) == NULL)
3131                                 return -ENODEV;
3132                         COPYOUT(this_floppy[0]);
3133                         return 0;
3134                 case OLDFDPOLLDRVSTAT:
3135                 case FDPOLLDRVSTAT:
3136                         LOCK_FDC(drive,1);
3137                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3138                         process_fd_request();
3139                         /* fall through */
3140                 case OLDFDGETDRVSTAT:
3141                 case FDGETDRVSTAT:
3142                         COPYOUT(*UDRS);
3143                         return 0;
3144                 case OLDFDGETFDCSTAT:
3145                         COPYOUT(* (struct old_floppy_fdc_state *) UFDCS);
3146                         return 0;
3147                 case FDGETFDCSTAT:
3148                         COPYOUT(*UFDCS);
3149                         return 0;
3150                 case OLDFDGETDRVPRM:
3151                 case FDGETDRVPRM:
3152                         COPYOUT(*UDP);
3153                         return 0;
3154                 case OLDFDWERRORGET:
3155                 case FDWERRORGET:
3156                         COPYOUT(*UDRWE);
3157                         return 0;
3158         }
3159         if (!IOCTL_ALLOWED)
3160                 return -EPERM;
3161         switch (cmd) {
3162                 case OLDFDWERRORCLR:
3163                 case FDWERRORCLR:
3164                         UDRWE->write_errors = 0;
3165                         UDRWE->first_error_sector = 0;
3166                         UDRWE->first_error_generation = 0;
3167                         UDRWE->last_error_sector = 0;
3168                         UDRWE->last_error_generation = 0;
3169                         UDRWE->badness = 0;
3170                         return 0;
3171                 case OLDFDRAWCMD:
3172                 case FDRAWCMD:
3173                         if (type)
3174                                 return -EINVAL;
3175                         LOCK_FDC(drive,1);
3176                         set_floppy(device);
3177                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3178                         process_fd_request();
3179                         return i;
3180                 case OLDFDFMTTRK:
3181                 case FDFMTTRK:
3182                         if (UDRS->fd_ref != 1)
3183                                 return -EBUSY;
3184                         COPYIN(tmp_format_req);
3185                         return do_format(device, &tmp_format_req);
3186                 case OLDFDSETMAXERRS:
3187                 case FDSETMAXERRS:
3188                         COPYIN(UDP->max_errors);
3189                         return 0;
3190                 case OLDFDFMTBEG:
3191                 case FDFMTBEG:
3192                         return 0;
3193                 case OLDFDCLRPRM:
3194                 case FDCLRPRM:
3195                         LOCK_FDC(drive,1);
3196                         current_type[drive] = NULL;
3197                         floppy_sizes[drive] = MAX_DISK_SIZE;
3198                         UDRS->keep_data = 0;
3199                         return invalidate_drive(device);
3200                 case OLDFDFMTEND:
3201                 case FDFMTEND:
3202                 case OLDFDFLUSH:
3203                 case FDFLUSH:
3204                         LOCK_FDC(drive,1);
3205                         return invalidate_drive(device);
3206                 case OLDFDSETPRM:
3207                 case FDSETPRM:
3208                 case OLDFDDEFPRM:
3209                 case FDDEFPRM:
3210                         COPYIN(newparams);
3211                         /* sanity checking for parameters.*/
3212                         if(newparams.sect <= 0 ||
3213                            newparams.head <= 0 ||
3214                            newparams.track <= 0 ||
3215                            newparams.track > UDP->tracks>> STRETCH(&newparams) ||
3216                            /* check if reserved bits are set */
3217                            (newparams.stretch & ~(FD_STRETCH | FD_SWAPSIDES)) != 0)
3218                                 return -EINVAL;
3219                         if ( type){
3220                                 if ( !suser() )
3221                                         return -EPERM;
3222                                 LOCK_FDC(drive,1);
3223                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3224                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3225                                             drive_state[cnt].fd_ref)
3226                                                 set_bit(drive, &fake_change);
3227                                 }
3228                                 floppy_type[type] = newparams;
3229                                 floppy_type[type].name="user format";
3230                                 for (cnt = type << 2 ;
3231                                      cnt < (type << 2 ) + 4 ;
3232                                      cnt++)
3233                                         floppy_sizes[cnt]=
3234                                                 floppy_sizes[cnt+0x80]=
3235                                                 floppy_type[type].size>>1;
3236                                 process_fd_request();
3237                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3238                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3239                                             drive_state[cnt].fd_ref)
3240                                                 check_disk_change(drive_state[cnt].
3241                                                                   fd_device);
3242                                 }
3243                                 return 0;
3244                         }
3245 
3246                         LOCK_FDC(drive,1);
3247                         if ( cmd != FDDEFPRM )
3248                                 /* notice a disk change immediately, else
3249                                  * we loose our settings immediately*/
3250                                 CALL(poll_drive(1,0));
3251                         user_params[drive] = newparams;
3252                         if (buffer_drive == drive &&
3253                             buffer_max > user_params[drive].sect)
3254                                 buffer_max=user_params[drive].sect;
3255                         current_type[drive] = &user_params[drive];
3256                         floppy_sizes[drive] = user_params[drive].size >> 1;
3257                         if (cmd == FDDEFPRM)
3258                                 DRS->keep_data = -1;
3259                         else
3260                                 DRS->keep_data = 1;
3261                         /* invalidation. Invalidate only when needed, i.e.
3262                          * when there are already sectors in the buffer cache
3263                          * whose number will change. This is useful, because
3264                          * mtools often changes the geometry of the disk after
3265                          * looking at the boot block */
3266                         if (DRS->maxblock >
3267                             user_params[drive].sect ||
3268                             DRS->maxtrack )
3269                                 invalidate_drive(device);
3270                         else
3271                                 process_fd_request();
3272                         return 0;
3273                 case OLDFDRESET:
3274                 case FDRESET:
3275                         return user_reset_fdc( drive, (int)param, 1);
3276                 case OLDFDMSGON:
3277                 case FDMSGON:
3278                         UDP->flags |= FTD_MSG;
3279                         return 0;
3280                 case OLDFDMSGOFF:
3281                 case FDMSGOFF:
3282                         UDP->flags &= ~FTD_MSG;
3283                         return 0;
3284                 case OLDFDSETEMSGTRESH:
3285                 case FDSETEMSGTRESH:
3286                         UDP->max_errors.reporting =
3287                         (unsigned short) (param & 0x0f);
3288                         return 0;
3289                 case OLDFDTWADDLE:
3290                 case FDTWADDLE:
3291                         LOCK_FDC(drive,1);
3292                         twaddle();
3293                         process_fd_request();
3294         }
3295         if ( ! suser() )
3296                 return -EPERM;
3297         switch(cmd){
3298                 case OLDFDSETDRVPRM:
3299                 case FDSETDRVPRM:
3300                         COPYIN(*UDP);
3301                         return 0;
3302                 default:
3303                         return -EINVAL;
3304         }
3305         return 0;
3306 #undef IOCTL_ALLOWED
3307 }
3308 
3309 static void config_types(void)
     /*  */
3310 {
3311         int first=1;
3312         int drive;
3313 
3314         /* read drive info out of physical cmos */
3315         drive=0;
3316         if (!UDP->cmos )
3317                 UDP->cmos= FLOPPY0_TYPE;
3318         drive=1;
3319         if (!UDP->cmos && FLOPPY1_TYPE)
3320                 UDP->cmos = FLOPPY1_TYPE;
3321 
3322         /* XXX */
3323         /* additional physical CMOS drive detection should go here */
3324 
3325         for (drive=0; drive < N_DRIVE; drive++){
3326                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3327                         memcpy((char *) UDP,
3328                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3329                                sizeof(struct floppy_drive_params));
3330                 if (UDP->cmos){
3331                         if (first)
3332                                 printk("Floppy drive(s): ");
3333                         else
3334                                 printk(", ");
3335                         first=0;
3336                         if (UDP->cmos > 0 ){
3337                                 ALLOWED_DRIVE_MASK |= 1 << drive;
3338                                 printk("fd%d is %s", drive,
3339                                        default_drive_params[(int)UDP->cmos].name);
3340                         } else
3341                                 printk("fd%d is unknown type %d",drive,
3342                                        UDP->cmos);
3343                 }
3344         }
3345         if(!first)
3346                 printk("\n");
3347 }
3348 
3349 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
3350                        char * buf, int count)
3351 {
3352         int drive = DRIVE(inode->i_rdev);
3353 
3354         check_disk_change(inode->i_rdev);
3355         if (UTESTF(FD_DISK_CHANGED))
3356                 return -ENXIO;
3357         return block_read(inode, filp, buf, count);
3358 }
3359 
3360 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
3361                         const char * buf, int count)
3362 {
3363         int block;
3364         int ret;
3365         int drive = DRIVE(inode->i_rdev);
3366 
3367         if(!UDRS->maxblock)
3368                 UDRS->maxblock=1;/* make change detectable */
3369         check_disk_change(inode->i_rdev);
3370         if (UTESTF(FD_DISK_CHANGED))
3371                 return -ENXIO;
3372         if(!UTESTF(FD_DISK_WRITABLE))
3373                 return -EROFS;
3374         block = (filp->f_pos + count) >> 9;
3375         if(block > UDRS->maxblock)
3376                 UDRS->maxblock = block;
3377         ret= block_write(inode, filp, buf, count);
3378         return ret;
3379 }
3380 
3381 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
3382 {
3383         int drive;
3384 
3385         drive = DRIVE(inode->i_rdev);
3386 
3387         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3388                 /* if the file is mounted OR (writable now AND writable at
3389                  * open time) Linus: Does this cover all cases? */
3390                 block_fsync(inode,filp);
3391 
3392         if (UDRS->fd_ref < 0)
3393                 UDRS->fd_ref=0;
3394         else if (!UDRS->fd_ref--) {
3395                 DPRINT("floppy_release with fd_ref == 0");
3396                 UDRS->fd_ref = 0;
3397         }
3398         floppy_release_irq_and_dma();
3399 }
3400 
3401 /*
3402  * floppy_open check for aliasing (/dev/fd0 can be the same as
3403  * /dev/PS0 etc), and disallows simultaneous access to the same
3404  * drive with different device numbers.
3405  */
3406 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3407 
3408 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
3409 {
3410         int drive;
3411         int old_dev;
3412         int try;
3413         char *tmp;
3414 
3415         if (!filp) {
3416                 DPRINT("Weird, open called with filp=0\n");
3417                 return -EIO;
3418         }
3419 
3420         drive = DRIVE(inode->i_rdev);
3421 
3422         if (drive >= N_DRIVE ||
3423             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3424             fdc_state[FDC(drive)].version == FDC_NONE)
3425                 return -ENXIO;
3426 
3427         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3428                 return -ENXIO;
3429         old_dev = UDRS->fd_device;
3430         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3431                 return -EBUSY;
3432 
3433         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3434                 USETF(FD_DISK_CHANGED);
3435                 USETF(FD_VERIFY);
3436         }
3437 
3438         if(UDRS->fd_ref == -1 ||
3439            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3440                 return -EBUSY;
3441 
3442         if (floppy_grab_irq_and_dma())
3443                 return -EBUSY;
3444 
3445         if (filp->f_flags & O_EXCL)
3446                 UDRS->fd_ref = -1;
3447         else
3448                 UDRS->fd_ref++;
3449 
3450         if (!floppy_track_buffer){
3451                 /* if opening an ED drive, reserve a big buffer,
3452                  * else reserve a small one */
3453                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3454                         try = 64; /* Only 48 actually useful */
3455                 else
3456                         try = 32; /* Only 24 actually useful */
3457 
3458                 tmp=(char *)dma_mem_alloc(1024 * try);
3459                 if (!tmp) {
3460                         try >>= 1; /* buffer only one side */
3461                         if (try < 16)
3462                                 try=16;
3463                         tmp= (char *)dma_mem_alloc(1024*try);
3464                 }
3465                 if (!tmp) {
3466                         DPRINT("Unable to allocate DMA memory\n");
3467                         RETERR(ENXIO);
3468                 }
3469                 if (floppy_track_buffer){
3470                         free_pages((unsigned long)tmp,__get_order(try*1024));
3471                 }else {
3472                         floppy_track_buffer = tmp;
3473                         max_buffer_sectors = try;
3474                 }
3475         }
3476 
3477         UDRS->fd_device = MINOR(inode->i_rdev);
3478 
3479         if (old_dev && old_dev != inode->i_rdev) {
3480                 if (buffer_drive == drive)
3481                         buffer_track = -1;
3482                 invalidate_buffers(old_dev);
3483         }
3484 
3485         /* Allow ioctls if we have write-permissions even if read-only open */
3486         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3487                 filp->f_mode |= IOCTL_MODE_BIT;
3488         if (filp->f_mode & 2)
3489                 filp->f_mode |= OPEN_WRITE_BIT;
3490 
3491         if (UFDCS->rawcmd == 1)
3492                 UFDCS->rawcmd = 2;
3493 
3494         if (filp->f_flags & O_NDELAY)
3495                 return 0;
3496         if (filp->f_mode & 3) {
3497                 UDRS->last_checked = 0;
3498                 check_disk_change(inode->i_rdev);
3499                 if (UTESTF(FD_DISK_CHANGED))
3500                         RETERR(ENXIO);
3501         }
3502         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3503                 RETERR(EROFS);
3504         return 0;
3505 #undef RETERR
3506 }
3507 
3508 /*
3509  * Check if the disk has been changed or if a change has been faked.
3510  */
3511 static int check_floppy_change(kdev_t dev)
     /*  */
3512 {
3513         int drive = DRIVE( dev );
3514 
3515         if (MAJOR(dev) != MAJOR_NR) {
3516                 DPRINT("floppy_changed: not a floppy\n");
3517                 return 0;
3518         }
3519 
3520         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3521                 return 1;
3522 
3523         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3524                 lock_fdc(drive,0);
3525                 poll_drive(0,0);
3526                 process_fd_request();
3527         }
3528 
3529         if(UTESTF(FD_DISK_CHANGED) ||
3530            UTESTF(FD_VERIFY) ||
3531            test_bit(drive, &fake_change) ||
3532            (!TYPE(dev) && !current_type[drive]))
3533                 return 1;
3534         return 0;
3535 }
3536 
3537 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3538  * the bootblock (block 0). "Autodetection" is also needed to check whether
3539  * there is a disk in the drive at all... Thus we also do it for fixed
3540  * geometry formats */
3541 static int floppy_revalidate(kdev_t dev)
     /*  */
3542 {
3543 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3544         struct buffer_head * bh;
3545         int drive=DRIVE(dev);
3546         int cf;
3547 
3548         if(UTESTF(FD_DISK_CHANGED) ||
3549            UTESTF(FD_VERIFY) ||
3550            test_bit(drive, &fake_change) ||
3551            NO_GEOM){
3552                 lock_fdc(drive,0);
3553                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3554                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3555                         process_fd_request(); /*already done by another thread*/
3556                         return 0;
3557                 }
3558                 UDRS->maxblock = 0;
3559                 UDRS->maxtrack = 0;
3560                 if ( buffer_drive == drive)
3561                         buffer_track = -1;
3562                 clear_bit(drive, &fake_change);
3563                 UCLEARF(FD_DISK_CHANGED);
3564                 if(cf)
3565                         UDRS->generation++;
3566                 if(NO_GEOM){
3567                         /* auto-sensing */
3568                         int size = floppy_blocksizes[MINOR(dev)];
3569                         if (!size)
3570                                 size = 1024;
3571                         if (!(bh = getblk(dev,0,size))){
3572                                 process_fd_request();
3573                                 return 1;
3574                         }
3575                         if ( bh && ! bh->b_uptodate)
3576                                 ll_rw_block(READ, 1, &bh);
3577                         process_fd_request();
3578                         wait_on_buffer(bh);
3579                         brelse(bh);
3580                         return 0;
3581                 }
3582                 if(cf)
3583                         poll_drive(0, FD_RAW_NEED_DISK);
3584                 process_fd_request();
3585         }
3586         return 0;
3587 }
3588 
3589 static struct file_operations floppy_fops = {
3590         NULL,                   /* lseek - default */
3591         floppy_read,            /* read - general block-dev read */
3592         floppy_write,           /* write - general block-dev write */
3593         NULL,                   /* readdir - bad */
3594         NULL,                   /* select */
3595         fd_ioctl,               /* ioctl */
3596         NULL,                   /* mmap */
3597         floppy_open,            /* open */
3598         floppy_release,         /* release */
3599         block_fsync,            /* fsync */
3600         NULL,                   /* fasync */
3601         check_floppy_change,    /* media_change */
3602         floppy_revalidate,      /* revalidate */
3603 };
3604 
3605 /*
3606  * Floppy Driver initialisation
3607  * =============================
3608  */
3609 
3610 /* Determine the floppy disk controller type */
3611 /* This routine was written by David C. Niemi */
3612 static char get_fdc_version(void)
     /*  */
3613 {
3614         int r;
3615 
3616         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3617         if ( FDCS->reset )
3618                 return FDC_NONE;
3619         if ( (r = result()) <= 0x00)
3620                 return FDC_NONE;        /* No FDC present ??? */
3621         if ((r==1) && (reply_buffer[0] == 0x80)){
3622                 printk("FDC %d is a 8272A\n",fdc);
3623                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3624         }
3625         if (r != 10) {
3626                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3627                 return FDC_UNKNOWN;
3628         }
3629         output_byte(FD_VERSION);
3630         r = result();
3631         if ((r == 1) && (reply_buffer[0] == 0x80)){
3632                 printk("FDC %d is a 82072\n",fdc);
3633                 return FDC_82072;               /* 82072 doesn't know VERSION */
3634         }
3635         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3636                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3637                 return FDC_UNKNOWN;
3638         }
3639         output_byte(FD_UNLOCK);
3640         r = result();
3641         if ((r == 1) && (reply_buffer[0] == 0x80)){
3642                 printk("FDC %d is a pre-1991 82077\n", fdc);
3643                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3644         }
3645         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3646                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3647                 return FDC_UNKNOWN;
3648         }
3649         printk("FDC %d is a post-1991 82077\n",fdc);
3650         return FDC_82077;       /* Revised 82077AA passes all the tests */
3651 } /* get_fdc_version */
3652 
3653 /* lilo configuration */
3654 
3655 /* we make the invert_dcl function global. One day, somebody might
3656 want to centralize all thinkpad related options into one lilo option,
3657 there are just so many thinkpad related quirks! */
3658 void floppy_invert_dcl(int *ints,int param)
     /*  */
3659 {
3660         int i;
3661 
3662         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3663                 if (param)
3664                         default_drive_params[i].params.flags |= 0x80;
3665                 else
3666                         default_drive_params[i].params.flags &= ~0x80;
3667         }
3668         DPRINT("Configuring drives for inverted dcl\n");
3669 }
3670 
3671 static void daring(int *ints,int param)
     /*  */
3672 {
3673         int i;
3674 
3675         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3676                 if (param){
3677                         default_drive_params[i].params.select_delay = 0;
3678                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3679                 } else {
3680                         default_drive_params[i].params.select_delay = 2*HZ/100;
3681                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3682                 }
3683         }
3684         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3685 }
3686 
3687 static void allow_drives(int *ints, int param)
     /*  */
3688 {
3689         ALLOWED_DRIVE_MASK=param;
3690         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3691 }
3692 
3693 static void fdc2_adr(int *ints, int param)
     /*  */
3694 {
3695         FDC2 = param;
3696         if(param)
3697                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3698         else
3699                 DPRINT("disabling second fdc\n");
3700 }
3701 
3702 static void unex(int *ints,int param)
     /*  */
3703 {
3704         print_unex = param;
3705         DPRINT1("%sprinting messages for unexpected interrupts\n",
3706                 param ? "" : "not ");
3707 }
3708 
3709 static void set_cmos(int *ints, int dummy)
     /*  */
3710 {
3711         int current_drive=0;
3712 
3713         if ( ints[0] != 2 ){
3714                 DPRINT("wrong number of parameter for cmos\n");
3715                 return;
3716         }
3717         current_drive = ints[1];
3718         if (current_drive < 0 || current_drive >= 8 ){
3719                 DPRINT("bad drive for set_cmos\n");
3720                 return;
3721         }
3722         if(current_drive >= 4 && !FDC2)
3723                 fdc2_adr(0, 0x370);
3724         if(ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3725                 DPRINT1("bad cmos code %d\n", ints[2]);
3726                 return;
3727         }
3728         DP->cmos = ints[2];
3729         DPRINT1("setting cmos code to %d\n", ints[2]);
3730 }
3731 
3732 static struct param_table {
3733         const char *name;
3734         void (*fn)(int *ints, int param);
3735         int def_param;
3736 } config_params[]={
3737         { "allowed_drive_mask", allow_drives, 0xff },
3738         { "all_drives", allow_drives, 0xff },
3739         { "asus_pci", allow_drives, 0x33 },
3740 
3741         { "daring", daring, 1},
3742 
3743         { "two_fdc", fdc2_adr, 0x370 },
3744         { "one_fdc", fdc2_adr, 0 },
3745 
3746         { "thinkpad", floppy_invert_dcl, 1 },
3747 
3748         { "cmos", set_cmos, 0 },
3749 
3750         { "unexpected_interrupts", unex, 1 },
3751         { "no_unexpected_interrupts", unex, 0 },
3752         { "L40SX", unex, 0 } };
3753 
3754 #define FLOPPY_SETUP
3755 void floppy_setup(char *str, int *ints)
     /*  */
3756 {
3757         int i;
3758         int param;
3759         if(str)
3760                 for(i=0; i< ARRAY_SIZE(config_params); i++){
3761                         if (strcmp(str,config_params[i].name) == 0 ){
3762                                 if (ints[0] )
3763                                         param = ints[1];
3764                                 else
3765                                         param = config_params[i].def_param;
3766                                 config_params[i].fn(ints,param);
3767                                 return;
3768                         }
3769                 }
3770         if(str) {
3771                 DPRINT1("unknown floppy option [%s]\n", str);
3772                 
3773                 DPRINT("allowed options are:");
3774                 for(i=0; i< ARRAY_SIZE(config_params); i++)
3775                         printk(" %s",config_params[i].name);
3776                 printk("\n");
3777         } else
3778                 DPRINT("botched floppy option\n");
3779         DPRINT("Read linux/drivers/block/README.fd\n");
3780 }
3781 
3782 int floppy_init(void)
     /*  */
3783 {
3784         int i,unit,drive;
3785         int have_no_fdc=0;
3786 
3787         raw_cmd = 0;
3788 
3789         sti();
3790 
3791         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3792                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3793                 return -EBUSY;
3794         }
3795 
3796         for(i=0; i<256; i++)
3797                 if (TYPE(i))
3798                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3799                 else
3800                         floppy_sizes[i] = MAX_DISK_SIZE;
3801 
3802         blk_size[MAJOR_NR] = floppy_sizes;
3803         blksize_size[MAJOR_NR] = floppy_blocksizes;
3804         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3805         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3806         config_types();
3807 
3808         fdc_state[0].address = FDC1;
3809         fdc_state[0].dor = 0;
3810 #if N_FDC > 1
3811         fdc_state[1].address = FDC2;
3812         fdc_state[1].dor = 0;
3813 #endif
3814 
3815         for (i = 0 ; i < N_FDC ; i++) {
3816                 fdc = i;
3817                 FDCS->dtr = -1;
3818                 FDCS->dor = 0x4;
3819                 FDCS->reset = 0;
3820                 FDCS->version = FDC_NONE;
3821         }
3822 
3823         if(floppy_grab_irq_and_dma()){
3824                 unregister_blkdev(MAJOR_NR,"fd");
3825                 return -EBUSY;
3826         }
3827 
3828         /* initialise drive state */
3829         for (drive = 0; drive < N_DRIVE ; drive++) {
3830                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3831                 UDRS->generation = 0;
3832                 UDRS->keep_data = 0;
3833                 UDRS->fd_ref = 0;
3834                 UDRS->fd_device = 0;
3835                 floppy_track_buffer = NULL;
3836                 max_buffer_sectors = 0;
3837                 UDRWE->write_errors = 0;
3838                 UDRWE->first_error_sector = 0;
3839                 UDRWE->first_error_generation = 0;
3840                 UDRWE->last_error_sector = 0;
3841                 UDRWE->last_error_generation = 0;
3842                 UDRWE->badness = 0;
3843         }
3844 
3845         for (i = 0 ; i < N_FDC ; i++) {
3846                 fdc = i;
3847                 FDCS->driver_version = FD_DRIVER_VERSION;
3848                 for(unit=0; unit<4; unit++)
3849                         FDCS->track[unit] = 0;
3850                 if (FDCS->address == -1 )
3851                         continue;
3852                 FDCS->rawcmd = 2;
3853                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3854                         FDCS->address = -1;
3855                         continue;
3856                 }
3857                 /* Try to determine the floppy controller type */
3858                 FDCS->version = get_fdc_version();
3859                 if (FDCS->version == FDC_NONE){
3860                         FDCS->address = -1;
3861                         continue;
3862                 }
3863 
3864                 request_region(FDCS->address, 6, "floppy");
3865                 request_region(FDCS->address+7, 1, "floppy DIR");
3866                 /* address + 6 is reserved, and may be taken by IDE.
3867                  * Unfortunately, Adaptec doesn't know this :-(, */
3868 
3869                 have_no_fdc = 0;
3870                 /* Not all FDCs seem to be able to handle the version command
3871                  * properly, so force a reset for the standard FDC clones,
3872                  * to avoid interrupt garbage.
3873                  */
3874                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3875                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3876         }
3877         fdc=0;
3878         del_timer(&fd_timeout);
3879         current_drive = 0;
3880         floppy_release_irq_and_dma();
3881         initialising=0;
3882         if(have_no_fdc)
3883                 unregister_blkdev(MAJOR_NR,"fd");
3884         else
3885                 virtual_dma_init();
3886         return have_no_fdc;
3887 }
3888 
3889 static int floppy_grab_irq_and_dma(void)
     /*  */
3890 {
3891         int i;
3892         cli();
3893         if (usage_count++){
3894                 sti();
3895                 return 0;
3896         }
3897         sti();
3898         MOD_INC_USE_COUNT;
3899         for(i=0; i< N_FDC; i++){
3900                 if(FDCS->address != -1){
3901                         fdc = i;
3902                         reset_fdc_info(1);
3903                         fd_outb(FDCS->dor, FD_DOR);
3904                 }
3905         }
3906         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3907 
3908         if (fd_request_irq()) {
3909                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3910                         FLOPPY_IRQ);
3911                 return -1;
3912         }
3913         if (fd_request_dma()) {
3914                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3915                         FLOPPY_DMA);
3916                 fd_free_irq();
3917                 return -1;
3918         }
3919         for(fdc = 0; fdc < N_FDC ; fdc++)
3920                 if(FDCS->address != -1)
3921                         fd_outb(FDCS->dor, FD_DOR);
3922         fdc = 0;
3923         fd_enable_irq();
3924         return 0;
3925 }
3926 
3927 static void floppy_release_irq_and_dma(void)
     /*  */
3928 {
3929 #ifdef FLOPPY_SANITY_CHECK
3930         int drive;
3931 #endif
3932         long tmpsize;
3933         void *tmpaddr;
3934 
3935         cli();
3936         if (--usage_count){
3937                 sti();
3938                 return;
3939         }
3940         sti();
3941         MOD_DEC_USE_COUNT;
3942         fd_disable_dma();
3943         fd_free_dma();
3944         fd_disable_irq();
3945         fd_free_irq();
3946 
3947         set_dor(0, ~0, 8);
3948 #if N_FDC > 1
3949         set_dor(1, ~8, 0);
3950 #endif
3951         floppy_enable_hlt();
3952 
3953         if (floppy_track_buffer && max_buffer_sectors) {
3954                 tmpsize = max_buffer_sectors*1024;
3955                 tmpaddr = (void *)floppy_track_buffer;
3956                 floppy_track_buffer = 0;
3957                 max_buffer_sectors = 0;
3958                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
3959         }
3960 
3961 #ifdef FLOPPY_SANITY_CHECK
3962         for(drive=0; drive < N_FDC * 4; drive++)
3963                 if( motor_off_timer[drive].next )
3964                         printk("motor off timer %d still active\n", drive);
3965 
3966         if(fd_timeout.next)
3967                 printk("floppy timer still active:%s\n", timeout_message);
3968         if (fd_timer.next)
3969                 printk("auxiliary floppy timer still active\n");
3970         if(floppy_tq.sync)
3971                 printk("task queue still active\n");
3972 #endif
3973 }
3974 
3975 
3976 #ifdef MODULE
3977 
3978 extern char *get_options(char *str, int *ints);
3979 
3980 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /*  */
3981 {
3982         int i;
3983         char c;
3984         int j;
3985         int match;
3986         char buffer[100];
3987         int ints[11];
3988         int length = strlen(pattern)+1;
3989 
3990         match=0;
3991         j=1;
3992 
3993         for(i=current->mm->env_start; i< current->mm->env_end; i ++){
3994                 c= get_fs_byte(i);
3995                 if(match){
3996                         if(j==99)
3997                                 c='\0';
3998                         buffer[j] = c;
3999                         if(!c || c == ' ' || c == '\t'){
4000                                 if(j){
4001                                         buffer[j] = '\0';
4002                                         setup(get_options(buffer,ints),ints);
4003                                 }
4004                                 j=0;
4005                         } else
4006                                 j++;
4007                         if(!c)
4008                                 break;
4009                         continue;
4010                 }
4011                 if( (!j && !c) || ( j && c == pattern[j-1]))
4012                         j++;
4013                 else
4014                         j=0;
4015                 if(j==length){
4016                         match=1;
4017                         j=0;
4018                 }
4019         }
4020 }
4021 
4022 
4023 #ifdef __cplusplus
4024 extern "C" {
4025 #endif
4026 int init_module(void)
     /*  */
4027 {
4028         int ret;
4029         printk("inserting floppy driver for %s\n", kernel_version);
4030                 
4031         mod_setup("floppy=", floppy_setup);
4032                 
4033         ret = floppy_init();
4034                 return 0;
4035 }
4036 
4037 void cleanup_module(void)
     /*  */
4038 {
4039         int fdc;
4040                 
4041         for(fdc=0; fdc<2; fdc++)
4042                 if (FDCS->address != -1){
4043                         release_region(FDCS->address, 6);
4044                         release_region(FDCS->address+7, 1);
4045         }
4046                 
4047         unregister_blkdev(MAJOR_NR, "fd");
4048 
4049         blk_dev[MAJOR_NR].request_fn = 0;
4050 }
4051 
4052 #ifdef __cplusplus
4053 }
4054 #endif
4055 
4056 #endif