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. maximum
10. minimum
11. disk_change
12. is_selected
13. set_dor
14. twaddle
15. reset_fdc_info
16. set_fdc
17. lock_fdc
18. unlock_fdc
19. motor_off_callback
20. floppy_off
21. scandrives
22. fd_watchdog
23. main_command_interrupt
24. wait_for_completion
25. floppy_disable_hlt
26. floppy_enable_hlt
27. setup_DMA
28. output_byte
29. result
30. perpendicular_mode
31. fdc_specify
32. fdc_dtr
33. tell_sector
34. interpret_errors
35. setup_rw_floppy
36. seek_interrupt
37. check_wp
38. seek_floppy
39. recal_interrupt
40. unexpected_floppy_interrupt
41. floppy_interrupt
42. recalibrate_floppy
43. reset_interrupt
44. reset_fdc
45. empty
46. show_floppy
47. floppy_shutdown
48. start_motor
49. floppy_ready
50. floppy_start
51. do_wakeup
52. wait_til_done
53. generic_done
54. generic_success
55. generic_failure
56. success_and_wakeup
57. next_valid_format
58. bad_flp_intr
59. set_floppy
60. format_interrupt
61. setup_format_params
62. redo_format
63. do_format
64. request_done
65. rw_interrupt
66. buffer_chain_size
67. transfer_size
68. copy_buffer
69. make_raw_rw_request
70. redo_fd_request
71. process_fd_request
72. do_fd_request
73. poll_drive
74. reset_intr
75. user_reset_fdc
76. fd_copyout
77. fd_copyin
78. drive_name
79. raw_cmd_done
80. raw_cmd_copyout
81. raw_cmd_free
82. raw_cmd_copyin
83. raw_cmd_ioctl
84. invalidate_drive
85. clear_write_error
86. set_geometry
87. normalize_0x02xx_ioctl
88. xlate_0x00xx_ioctl
89. fd_ioctl
90. config_types
91. floppy_read
92. floppy_write
93. floppy_release
94. floppy_open
95. check_floppy_change
96. floppy_revalidate
97. get_fdc_version
98. floppy_invert_dcl
99. daring
100. allow_drives
101. fdc2_adr
102. unex
103. set_cmos
104. floppy_setup
105. floppy_init
106. floppy_grab_irq_and_dma
107. floppy_release_irq_and_dma
108. mod_setup
109. init_module
110. cleanup_module

   1 /*
   2  *  linux/kernel/floppy.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1993, 1994  Alain Knaff
   6  */
   7 /*
   8  * 02.12.91 - Changed to static variables to indicate need for reset
   9  * and recalibrate. This makes some things easier (output_byte reset
  10  * checking etc), and means less interrupt jumping in case of errors,
  11  * so the code is hopefully easier to understand.
  12  */
  13 
  14 /*
  15  * This file is certainly a mess. I've tried my best to get it working,
  16  * but I don't like programming floppies, and I have only one anyway.
  17  * Urgel. I should check for more errors, and do more graceful error
  18  * recovery. Seems there are problems with several drives. I've tried to
  19  * correct them. No promises.
  20  */
  21 
  22 /*
  23  * As with hd.c, all routines within this file can (and will) be called
  24  * by interrupts, so extreme caution is needed. A hardware interrupt
  25  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  26  * call "floppy-on" directly, but have to set a special timer interrupt
  27  * etc.
  28  */
  29 
  30 /*
  31  * 28.02.92 - made track-buffering routines, based on the routines written
  32  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  33  */
  34 
  35 /*
  36  * Automatic floppy-detection and formatting written by Werner Almesberger
  37  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  38  * the floppy-change signal detection.
  39  */
  40 
  41 /*
  42  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  43  * FDC data overrun bug, added some preliminary stuff for vertical
  44  * recording support.
  45  *
  46  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  47  *
  48  * TODO: Errors are still not counted properly.
  49  */
  50 
  51 /* 1992/9/20
  52  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  53  * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
  54  * Christoph H. Hochst\"atter.
  55  * I have fixed the shift values to the ones I always use. Maybe a new
  56  * ioctl() should be created to be able to modify them.
  57  * There is a bug in the driver that makes it impossible to format a
  58  * floppy as the first thing after bootup.
  59  */
  60 
  61 /*
  62  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  63  * this helped the floppy driver as well. Much cleaner, and still seems to
  64  * work.
  65  */
  66 
  67 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  68  * minor modifications to allow 2.88 floppies to be run.
  69  */
  70 
  71 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
  72  * disk types.
  73  */
  74 
  75 /*
  76  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
  77  * format bug fixes, but unfortunately some new bugs too...
  78  */
  79 
  80 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write
  81  * errors to allow safe writing by specialized programs.
  82  */
  83 
  84 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
  85  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
  86  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
  87  * drives are "upside-down").
  88  */
  89 
  90 /*
  91  * 1995/8/26 -- Andreas Busse -- added Mips support.
  92  */
  93 
  94 /*
  95  * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependend
  96  * features to asm/floppy.h.
  97  */
  98 
  99 
 100 #define FLOPPY_SANITY_CHECK
 101 #undef  FLOPPY_SILENT_DCL_CLEAR
 102 
 103 #define REALLY_SLOW_IO
 104 
 105 #define DEBUGT 2
 106 #define DCL_DEBUG /* debug disk change line */
 107 
 108 /* do print messages for unexpected interrupts */
 109 static int print_unex=1;
 110 
 111 #include <linux/module.h>
 112 
 113 /* the following is the mask of allowed drives. By default units 2 and
 114  * 3 of both floppy controllers are disabled, because switching on the
 115  * motor of these drives causes system hangs on some PCI computers. drive
 116  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 117  * a drive is allowed. */
 118 static int FLOPPY_IRQ=6;
 119 static int FLOPPY_DMA=2;
 120 static int allowed_drive_mask = 0x33;
 121  
 122 
 123 #include <linux/sched.h>
 124 #include <linux/fs.h>
 125 #include <linux/kernel.h>
 126 #include <linux/timer.h>
 127 #include <linux/tqueue.h>
 128 #define FDPATCHES
 129 #include <linux/fdreg.h>
 130 
 131 
 132 #include <linux/fd.h>
 133 
 134 
 135 #define OLDFDRAWCMD 0x020d /* send a raw command to the fdc */
 136 
 137 struct old_floppy_raw_cmd {
 138   void *data;
 139   long length;
 140 
 141   unsigned char rate;
 142   unsigned char flags;
 143   unsigned char cmd_count;
 144   unsigned char cmd[9];
 145   unsigned char reply_count;
 146   unsigned char reply[7];
 147   int track;
 148 };
 149 
 150 #include <linux/errno.h>
 151 #include <linux/malloc.h>
 152 #include <linux/mm.h>
 153 #include <linux/string.h>
 154 #include <linux/fcntl.h>
 155 #include <linux/delay.h>
 156 #include <linux/mc146818rtc.h> /* CMOS defines */
 157 #include <linux/ioport.h>
 158 
 159 #include <asm/dma.h>
 160 #include <asm/floppy.h>
 161 #include <asm/irq.h>
 162 #include <asm/system.h>
 163 #include <asm/io.h>
 164 #include <asm/segment.h>
 165 
 166 #define MAJOR_NR FLOPPY_MAJOR
 167 
 168 #include <linux/blk.h>
 169 
 170 
 171 /* Dma Memory related stuff */
 172 
 173 /* Pure 2^n version of get_order */
 174 static inline int __get_order (int size)
     /*  */
 175 {
 176         int order;
 177 
 178 #ifdef  _ASM_IO_H2
 179         __asm__ __volatile__("bsr %1,%0"
 180                              : "=r" (order)
 181                              : "r" (size / PAGE_SIZE));
 182 #else
 183         for (order = 0; order < NR_MEM_LISTS; ++order)
 184                 if (size <= (PAGE_SIZE << order))
 185                         return order;
 186 #endif
 187         return NR_MEM_LISTS;
 188 }
 189 
 190 static unsigned long dma_mem_alloc(int size)
     /*  */
 191 {
 192         int order = __get_order(size);
 193 
 194         if (order >= NR_MEM_LISTS)
 195                 return(0);
 196         return __get_dma_pages(GFP_KERNEL,order);
 197 }
 198 
 199 /* End dma memory related stuff */
 200 
 201 static unsigned int fake_change = 0;
 202 static int initialising=1;
 203 
 204 static inline int TYPE(kdev_t x) {
     /*  */
 205         return  (MINOR(x)>>2) & 0x1f;
 206 }
 207 static inline int DRIVE(kdev_t x) {
     /*  */
 208         return (MINOR(x)&0x03) | ((MINOR(x)&0x80) >> 5);
 209 }
 210 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 211 #define UNIT(x) ((x) & 0x03)            /* drive on fdc */
 212 #define FDC(x) (((x) & 0x04) >> 2)  /* fdc of drive */
 213 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
 214                                 /* reverse mapping from unit and fdc to drive */
 215 #define DP (&drive_params[current_drive])
 216 #define DRS (&drive_state[current_drive])
 217 #define DRWE (&write_errors[current_drive])
 218 #define FDCS (&fdc_state[fdc])
 219 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 220 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 221 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 222 
 223 #define UDP (&drive_params[drive])
 224 #define UDRS (&drive_state[drive])
 225 #define UDRWE (&write_errors[drive])
 226 #define UFDCS (&fdc_state[FDC(drive)])
 227 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 228 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 229 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 230 
 231 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 232 
 233 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 234 
 235 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 236 
 237 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 238 
 239 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 240 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 241 
 242 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
 243 
 244 /* read/write */
 245 #define COMMAND raw_cmd->cmd[0]
 246 #define DR_SELECT raw_cmd->cmd[1]
 247 #define TRACK raw_cmd->cmd[2]
 248 #define HEAD raw_cmd->cmd[3]
 249 #define SECTOR raw_cmd->cmd[4]
 250 #define SIZECODE raw_cmd->cmd[5]
 251 #define SECT_PER_TRACK raw_cmd->cmd[6]
 252 #define GAP raw_cmd->cmd[7]
 253 #define SIZECODE2 raw_cmd->cmd[8]
 254 #define NR_RW 9
 255 
 256 /* format */
 257 #define F_SIZECODE raw_cmd->cmd[2]
 258 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 259 #define F_GAP raw_cmd->cmd[4]
 260 #define F_FILL raw_cmd->cmd[5]
 261 #define NR_F 6
 262 
 263 /*
 264  * Maximum disk size (in kilobytes). This default is used whenever the
 265  * current disk size is unknown.
 266  * [Now it is rather a minimum]
 267  */
 268 #define MAX_DISK_SIZE 2 /* 3984*/
 269 
 270 #define K_64    0x10000         /* 64KB */
 271 
 272 /*
 273  * globals used by 'result()'
 274  */
 275 #define MAX_REPLIES 17
 276 static unsigned char reply_buffer[MAX_REPLIES];
 277 static int inr; /* size of reply buffer, when called from interrupt */
 278 #define ST0 (reply_buffer[0])
 279 #define ST1 (reply_buffer[1])
 280 #define ST2 (reply_buffer[2])
 281 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 282 #define R_TRACK (reply_buffer[3])
 283 #define R_HEAD (reply_buffer[4])
 284 #define R_SECTOR (reply_buffer[5])
 285 #define R_SIZECODE (reply_buffer[6])
 286 
 287 #define SEL_DLY (2*HZ/100)
 288 
 289 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 290 /*
 291  * this struct defines the different floppy drive types.
 292  */
 293 static struct {
 294         struct floppy_drive_params params;
 295         const char *name; /* name printed while booting */
 296 } default_drive_params[]= {
 297 /* NOTE: the time values in jiffies should be in msec!
 298  CMOS drive type
 299   |     Maximum data rate supported by drive type
 300   |     |   Head load time, msec
 301   |     |   |   Head unload time, msec (not used)
 302   |     |   |   |     Step rate interval, usec
 303   |     |   |   |     |       Time needed for spinup time (jiffies)
 304   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 305   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 306   |     |   |   |     |       |      |   |     Select delay
 307   |     |   |   |     |       |      |   |     |     RPS
 308   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 309   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 310   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 311   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 312 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 313       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 314 
 315 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 316       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 317 
 318 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 319       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 320 
 321 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 322       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 323 
 324 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 325       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 326 
 327 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 328       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 329 
 330 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 331       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 332 /*    |  --autodetected formats---    |      |      |
 333  *    read_track                      |      |    Name printed when booting
 334  *                                    |     Native format
 335  *                  Frequency of disk change checks */
 336 };
 337 
 338 static struct floppy_drive_params drive_params[N_DRIVE];
 339 static struct floppy_drive_struct drive_state[N_DRIVE];
 340 static struct floppy_write_errors write_errors[N_DRIVE];
 341 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 342 
 343 /*
 344  * This struct defines the different floppy types.
 345  *
 346  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 347  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 348  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 349  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 350  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 351  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 352  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 353  * 'stretch' should probably be renamed to something more general, like
 354  * 'options'.  Other parameters should be self-explanatory (see also
 355  * setfdprm(8)).
 356  */
 357 static struct floppy_struct floppy_type[32] = {
 358         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 359         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 360         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 361         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 362         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 363         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 364         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 365         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 366         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 367         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 368 
 369         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 370         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 371         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 372         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 373         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 374         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 375         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 376         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 377         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 378         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 379 
 380         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 381         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 382         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 383         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 384         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 385         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 386         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 387         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 388         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 389 
 390         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 391         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 392         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 393 };
 394 
 395 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 396 #define SECTSIZE (_FD_SECTSIZE(*floppy))
 397 
 398 /* Auto-detection: Disk type used until the next media change occurs. */
 399 static struct floppy_struct *current_type[N_DRIVE] = {
 400         NULL, NULL, NULL, NULL,
 401         NULL, NULL, NULL, NULL
 402 };
 403 
 404 /*
 405  * User-provided type information. current_type points to
 406  * the respective entry of this array.
 407  */
 408 static struct floppy_struct user_params[N_DRIVE];
 409 
 410 static int floppy_sizes[256];
 411 static int floppy_blocksizes[256] = { 0, };
 412 
 413 /*
 414  * The driver is trying to determine the correct media format
 415  * while probing is set. rw_interrupt() clears it after a
 416  * successful access.
 417  */
 418 static int probing = 0;
 419 
 420 /* Synchronization of FDC access. */
 421 #define FD_COMMAND_NONE -1
 422 #define FD_COMMAND_ERROR 2
 423 #define FD_COMMAND_OKAY 3
 424 
 425 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 426 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 427 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 428 #define CALL(x) if ((x) == -EINTR) return -EINTR
 429 #define ECALL(x) if ((ret = (x))) return ret;
 430 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 431 #define WAIT(x) _WAIT((x),interruptible)
 432 #define IWAIT(x) _WAIT((x),1)
 433 
 434 /* Errors during formatting are counted here. */
 435 static int format_errors;
 436 
 437 /* Format request descriptor. */
 438 static struct format_descr format_req;
 439 
 440 /*
 441  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 442  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 443  * H is head unload time (1=16ms, 2=32ms, etc)
 444  */
 445 
 446 /*
 447  * Track buffer
 448  * Because these are written to by the DMA controller, they must
 449  * not contain a 64k byte boundary crossing, or data will be
 450  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 451  * Note that you must not change the sizes below without updating head.S.
 452  */
 453 static char *floppy_track_buffer=0;
 454 static int max_buffer_sectors=0;
 455 
 456 static int *errors;
 457 typedef void (*done_f)(int);
 458 static struct cont_t {
 459         void (*interrupt)(void); /* this is called after the interrupt of the
 460                                   * main command */
 461         void (*redo)(void); /* this is called to retry the operation */
 462         void (*error)(void); /* this is called to tally an error */
 463         done_f done; /* this is called to say if the operation has 
 464                       * succeeded/failed */
 465 } *cont=NULL;
 466 
 467 static void floppy_ready(void);
 468 static void floppy_start(void);
 469 static void process_fd_request(void);
 470 static void recalibrate_floppy(void);
 471 static void floppy_shutdown(void);
 472 
 473 static int floppy_grab_irq_and_dma(void);
 474 static void floppy_release_irq_and_dma(void);
 475 
 476 /*
 477  * The "reset" variable should be tested whenever an interrupt is scheduled,
 478  * after the commands have been sent. This is to ensure that the driver doesn't
 479  * get wedged when the interrupt doesn't come because of a failed command.
 480  * reset doesn't need to be tested before sending commands, because
 481  * output_byte is automatically disabled when reset is set.
 482  */
 483 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
 484 static void reset_fdc(void);
 485 
 486 /*
 487  * These are global variables, as that's the easiest way to give
 488  * information to interrupts. They are the data used for the current
 489  * request.
 490  */
 491 #define NO_TRACK -1
 492 #define NEED_1_RECAL -2
 493 #define NEED_2_RECAL -3
 494 
 495 /* */
 496 static int usage_count = 0;
 497 
 498 
 499 /* buffer related variables */
 500 static int buffer_track = -1;
 501 static int buffer_drive = -1;
 502 static int buffer_min = -1;
 503 static int buffer_max = -1;
 504 
 505 /* fdc related variables, should end up in a struct */
 506 static struct floppy_fdc_state fdc_state[N_FDC];
 507 static int fdc; /* current fdc */
 508 
 509 static struct floppy_struct * floppy = floppy_type;
 510 static unsigned char current_drive = 0;
 511 static long current_count_sectors = 0;
 512 static unsigned char sector_t; /* sector in track */
 513 
 514 #ifdef DEBUGT
 515 static long unsigned debugtimer;
 516 #endif
 517 
 518 /*
 519  * Debugging
 520  * =========
 521  */
 522 static inline void set_debugt(void)
     /*  */
 523 {
 524 #ifdef DEBUGT
 525         debugtimer = jiffies;
 526 #endif
 527 }
 528 
 529 static inline void debugt(const char *message)
     /*  */
 530 {
 531 #ifdef DEBUGT
 532         if (DP->flags & DEBUGT)
 533                 printk("%s dtime=%lu\n", message, jiffies-debugtimer);
 534 #endif
 535 }
 536 
 537 typedef void (*timeout_fn)(unsigned long);
 538 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 539                                        (timeout_fn) floppy_shutdown };
 540 
 541 static const char *timeout_message;
 542 
 543 #ifdef FLOPPY_SANITY_CHECK
 544 static void is_alive(const char *message)
     /*  */
 545 {
 546         /* this routine checks whether the floppy driver is "alive" */
 547         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 548                 DPRINT1("timeout handler died: %s\n",message);
 549         }
 550 }
 551 #endif
 552 
 553 #ifdef FLOPPY_SANITY_CHECK
 554 
 555 #define OLOGSIZE 20
 556 
 557 static void (*lasthandler)(void) = NULL;
 558 static int interruptjiffies=0;
 559 static int resultjiffies=0;
 560 static int resultsize=0;
 561 static int lastredo=0;
 562 
 563 static struct output_log {
 564         unsigned char data;
 565         unsigned char status;
 566         unsigned long jiffies;
 567 } output_log[OLOGSIZE];
 568 
 569 static int output_log_pos=0;
 570 #endif
 571 
 572 #define CURRENTD -1
 573 #define MAXTIMEOUT -2
 574 
 575 static void reschedule_timeout(int drive, const char *message, int marg)
     /*  */
 576 {
 577         if (drive == CURRENTD)
 578                 drive = current_drive;
 579         del_timer(&fd_timeout);
 580         if (drive < 0 || drive > N_DRIVE) {
 581                 fd_timeout.expires = jiffies + 20*HZ;
 582                 drive=0;
 583         } else
 584                 fd_timeout.expires = jiffies + UDP->timeout;
 585         add_timer(&fd_timeout);
 586         if (UDP->flags & FD_DEBUG){
 587                 DPRINT("reschedule timeout ");
 588                 printk(message, marg);
 589                 printk("\n");
 590         }
 591         timeout_message = message;
 592 }
 593 
 594 static int maximum(int a, int b)
     /*  */
 595 {
 596         if(a > b)
 597                 return a;
 598         else
 599                 return b;
 600 }
 601 #define INFBOUND(a,b) (a)=maximum((a),(b));
 602 
 603 static int minimum(int a, int b)
     /*  */
 604 {
 605         if(a < b)
 606                 return a;
 607         else
 608                 return b;
 609 }
 610 #define SUPBOUND(a,b) (a)=minimum((a),(b));
 611 
 612 
 613 /*
 614  * Bottom half floppy driver.
 615  * ==========================
 616  *
 617  * This part of the file contains the code talking directly to the hardware,
 618  * and also the main service loop (seek-configure-spinup-command)
 619  */
 620 
 621 /*
 622  * disk change.
 623  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 624  * and the last_checked date.
 625  *
 626  * last_checked is the date of the last check which showed 'no disk change'
 627  * FD_DISK_CHANGE is set under two conditions:
 628  * 1. The floppy has been changed after some i/o to that floppy already
 629  *    took place.
 630  * 2. No floppy disk is in the drive. This is done in order to ensure that
 631  *    requests are quickly flushed in case there is no disk in the drive. It
 632  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 633  *    the drive.
 634  *
 635  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 636  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 637  *  each seek. If a disk is present, the disk change line should also be
 638  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 639  *  change line is set, this means either that no disk is in the drive, or
 640  *  that it has been removed since the last seek.
 641  *
 642  * This means that we really have a third possibility too:
 643  *  The floppy has been changed after the last seek.
 644  */
 645 
 646 static int disk_change(int drive)
     /*  */
 647 {
 648         int fdc=FDC(drive);
 649 #ifdef FLOPPY_SANITY_CHECK
 650         if (jiffies < UDP->select_delay + UDRS->select_date)
 651                 DPRINT("WARNING disk change called early\n");
 652         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 653            (FDCS->dor & 3) != UNIT(drive) ||
 654            fdc != FDC(drive)){
 655                 DPRINT("probing disk change on unselected drive\n");
 656                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 657                         FDCS->dor);
 658         }
 659 #endif
 660 
 661 #ifdef DCL_DEBUG
 662         if (UDP->flags & FD_DEBUG){
 663                 DPRINT1("checking disk change line for drive %d\n",drive);
 664                 DPRINT1("jiffies=%ld\n", jiffies);
 665                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 666                 DPRINT1("flags=%x\n",UDRS->flags);
 667         }
 668 #endif
 669         if (UDP->flags & FD_BROKEN_DCL)
 670                 return UTESTF(FD_DISK_CHANGED);
 671         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 672                 USETF(FD_VERIFY); /* verify write protection */
 673                 if (UDRS->maxblock){
 674                         /* mark it changed */
 675                         USETF(FD_DISK_CHANGED);
 676 
 677                         /* invalidate its geometry */
 678                         if (UDRS->keep_data >= 0) {
 679                                 if ((UDP->flags & FTD_MSG) &&
 680                                     current_type[drive] != NULL)
 681                                         DPRINT("Disk type is undefined after "
 682                                                "disk change\n");
 683                                 current_type[drive] = NULL;
 684                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 685                         }
 686                 }
 687                 /*USETF(FD_DISK_NEWCHANGE);*/
 688                 return 1;
 689         } else {
 690                 UDRS->last_checked=jiffies;
 691                 UCLEARF(FD_DISK_NEWCHANGE);
 692         }
 693         return 0;
 694 }
 695 
 696 static inline int is_selected(int dor, int unit)
     /*  */
 697 {
 698         return ((dor  & (0x10 << unit)) && (dor &3) == unit);
 699 }
 700 
 701 static int set_dor(int fdc, char mask, char data)
     /*  */
 702 {
 703         register unsigned char drive, unit, newdor,olddor;
 704 
 705         if (FDCS->address == -1)
 706                 return -1;
 707 
 708         olddor = FDCS->dor;
 709         newdor =  (olddor & mask) | data;
 710         if (newdor != olddor){
 711                 unit = olddor & 0x3;
 712                 if (is_selected(olddor, unit) && !is_selected(newdor,unit)){
 713                         drive = REVDRIVE(fdc,unit);
 714 #ifdef DCL_DEBUG
 715                         if (UDP->flags & FD_DEBUG){
 716                                 DPRINT("calling disk change from set_dor\n");
 717                         }
 718 #endif
 719                         disk_change(drive);
 720                 }
 721                 FDCS->dor = newdor;
 722                 fd_outb(newdor, FD_DOR);
 723 
 724                 unit = newdor & 0x3;
 725                 if (!is_selected(olddor, unit) && is_selected(newdor,unit)){
 726                         drive = REVDRIVE(fdc,unit);
 727                         UDRS->select_date = jiffies;
 728                 }
 729         }
 730         if (newdor & 0xf0)
 731                 floppy_grab_irq_and_dma();
 732         if (olddor & 0xf0)
 733                 floppy_release_irq_and_dma();
 734         return olddor;
 735 }
 736 
 737 static void twaddle(void)
     /*  */
 738 {
 739         if (DP->select_delay)
 740                 return;
 741         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 742         fd_outb(FDCS->dor, FD_DOR);
 743         DRS->select_date = jiffies;
 744 }
 745 
 746 /* reset all driver information about the current fdc. This is needed after
 747  * a reset, and after a raw command. */
 748 static void reset_fdc_info(int mode)
     /*  */
 749 {
 750         int drive;
 751 
 752         FDCS->spec1 = FDCS->spec2 = -1;
 753         FDCS->need_configure = 1;
 754         FDCS->perp_mode = 1;
 755         FDCS->rawcmd = 0;
 756         for (drive = 0; drive < N_DRIVE; drive++)
 757                 if (FDC(drive) == fdc &&
 758                     (mode || UDRS->track != NEED_1_RECAL))
 759                         UDRS->track = NEED_2_RECAL;
 760 }
 761 
 762 /* selects the fdc and drive, and enables the fdc's input/dma. */
 763 static void set_fdc(int drive)
     /*  */
 764 {
 765         if (drive >= 0 && drive < N_DRIVE){
 766                 fdc = FDC(drive);
 767                 current_drive = drive;
 768         }
 769         if (fdc != 1 && fdc != 0) {
 770                 printk("bad fdc value\n");
 771                 return;
 772         }
 773         set_dor(fdc,~0,8);
 774         set_dor(1-fdc, ~8, 0);
 775         if (FDCS->rawcmd == 2)
 776                 reset_fdc_info(1);
 777         if (fd_inb(FD_STATUS) != STATUS_READY)
 778                 FDCS->reset = 1;
 779 }
 780 
 781 /* locks the driver */
 782 static int lock_fdc(int drive, int interruptible)
     /*  */
 783 {
 784         if (!usage_count){
 785                 printk("trying to lock fdc while usage count=0\n");
 786                 return -1;
 787         }
 788         floppy_grab_irq_and_dma();
 789         cli();
 790         while (fdc_busy && NO_SIGNAL)
 791                 interruptible_sleep_on(&fdc_wait);
 792         if (fdc_busy){
 793                 sti();
 794                 return -EINTR;
 795         }
 796         fdc_busy = 1;
 797         sti();
 798         command_status = FD_COMMAND_NONE;
 799         reschedule_timeout(drive, "lock fdc", 0);
 800         set_fdc(drive);
 801         return 0;
 802 }
 803 
 804 #define LOCK_FDC(drive,interruptible) \
 805 if (lock_fdc(drive,interruptible)) return -EINTR;
 806 
 807 
 808 /* unlocks the driver */
 809 static inline void unlock_fdc(void)
     /*  */
 810 {
 811         raw_cmd = 0;
 812         if (!fdc_busy)
 813                 DPRINT("FDC access conflict!\n");
 814 
 815         if (DEVICE_INTR)
 816                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 817                         DEVICE_INTR);
 818         command_status = FD_COMMAND_NONE;
 819         del_timer(&fd_timeout);
 820         cont = NULL;
 821         fdc_busy = 0;
 822         floppy_release_irq_and_dma();
 823         wake_up(&fdc_wait);
 824 }
 825 
 826 /* switches the motor off after a given timeout */
 827 static void motor_off_callback(unsigned long nr)
     /*  */
 828 {
 829         unsigned char mask = ~(0x10 << UNIT(nr));
 830 
 831         set_dor(FDC(nr), mask, 0);
 832 }
 833 
 834 static struct timer_list motor_off_timer[N_DRIVE] = {
 835         { NULL, NULL, 0, 0, motor_off_callback },
 836         { NULL, NULL, 0, 1, motor_off_callback },
 837         { NULL, NULL, 0, 2, motor_off_callback },
 838         { NULL, NULL, 0, 3, motor_off_callback },
 839         { NULL, NULL, 0, 4, motor_off_callback },
 840         { NULL, NULL, 0, 5, motor_off_callback },
 841         { NULL, NULL, 0, 6, motor_off_callback },
 842         { NULL, NULL, 0, 7, motor_off_callback }
 843 };
 844 
 845 /* schedules motor off */
 846 static void floppy_off(unsigned int drive)
     /*  */
 847 {
 848         unsigned long volatile delta;
 849         register int fdc=FDC(drive);
 850 
 851         if (!(FDCS->dor & (0x10 << UNIT(drive))))
 852                 return;
 853 
 854         del_timer(motor_off_timer+drive);
 855 
 856         /* make spindle stop in a position which minimizes spinup time
 857          * next time */
 858         if (UDP->rps){
 859                 delta = jiffies - UDRS->first_read_date + HZ -
 860                         UDP->spindown_offset;
 861                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
 862                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 863         }
 864         add_timer(motor_off_timer+drive);
 865 }
 866 
 867 /*
 868  * cycle through all N_DRIVE floppy drives, for disk change testing.
 869  * stopping at current drive. This is done before any long operation, to
 870  * be sure to have up to date disk change information.
 871  */
 872 static void scandrives(void)
     /*  */
 873 {
 874         int i, drive, saved_drive;
 875 
 876         if (DP->select_delay)
 877                 return;
 878 
 879         saved_drive = current_drive;
 880         for (i=0; i < N_DRIVE; i++){
 881                 drive = (saved_drive + i + 1) % N_DRIVE;
 882                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
 883                         continue; /* skip closed drives */
 884                 set_fdc(drive);
 885                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
 886                       (0x10 << UNIT(drive))))
 887                         /* switch the motor off again, if it was off to
 888                          * begin with */
 889                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
 890         }
 891         set_fdc(saved_drive);
 892 }
 893 
 894 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 895 
 896 /* this function makes sure that the disk stays in the drive during the
 897  * transfer */
 898 static void fd_watchdog(void)
     /*  */
 899 {
 900 #ifdef DCL_DEBUG
 901         if (DP->flags & FD_DEBUG){
 902                 DPRINT("calling disk change from watchdog\n");
 903         }
 904 #endif
 905 
 906         if (disk_change(current_drive)){
 907                 DPRINT("disk removed during i/o\n");
 908                 floppy_shutdown();
 909         } else {
 910                 del_timer(&fd_timer);
 911                 fd_timer.function = (timeout_fn) fd_watchdog;
 912                 fd_timer.expires = jiffies + HZ / 10;
 913                 add_timer(&fd_timer);
 914         }
 915 }
 916 
 917 static void main_command_interrupt(void)
     /*  */
 918 {
 919         del_timer(&fd_timer);
 920         cont->interrupt();
 921 }
 922 
 923 /* waits for a delay (spinup or select) to pass */
 924 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 925 {
 926         if (FDCS->reset){
 927                 reset_fdc(); /* do the reset during sleep to win time
 928                               * if we don't need to sleep, it's a good
 929                               * occasion anyways */
 930                 return 1;
 931         }
 932 
 933         if (jiffies < delay){
 934                 del_timer(&fd_timer);
 935                 fd_timer.function = function;
 936                 fd_timer.expires = delay;
 937                 add_timer(&fd_timer);
 938                 return 1;
 939         }
 940         return 0;
 941 }
 942 
 943 static int hlt_disabled=0;
 944 static void floppy_disable_hlt(void)
     /*  */
 945 {
 946         unsigned long flags;
 947         save_flags(flags);
 948         cli();
 949         if (!hlt_disabled){
 950                 hlt_disabled=1;
 951 #ifdef HAVE_DISABLE_HLT
 952                 disable_hlt();
 953 #endif
 954         }
 955         restore_flags(flags);
 956 }
 957 
 958 static void floppy_enable_hlt(void)
     /*  */
 959 {
 960         unsigned long flags;
 961         save_flags(flags);
 962         cli();
 963         if (hlt_disabled){
 964                 hlt_disabled=0;
 965 #ifdef HAVE_DISABLE_HLT
 966                 enable_hlt();
 967 #endif
 968         }
 969         restore_flags(flags);
 970 }
 971 
 972 
 973 static void setup_DMA(void)
     /*  */
 974 {
 975 #ifdef FLOPPY_SANITY_CHECK
 976         if (raw_cmd->length == 0){
 977                 int i;
 978 
 979                 printk("zero dma transfer size:");
 980                 for (i=0; i < raw_cmd->cmd_count; i++)
 981                         printk("%x,", raw_cmd->cmd[i]);
 982                 printk("\n");
 983                 cont->done(0);
 984                 FDCS->reset = 1;
 985                 return;
 986         }
 987         if ((long) raw_cmd->kernel_data % 512){
 988                 printk("non aligned address: %p\n", raw_cmd->kernel_data);
 989                 cont->done(0);
 990                 FDCS->reset=1;
 991                 return;
 992         }
 993         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
 994                 printk("DMA crossing 64-K boundary %p-%p\n",
 995                        raw_cmd->kernel_data,
 996                        raw_cmd->kernel_data + raw_cmd->length);
 997                 cont->done(0);
 998                 FDCS->reset=1;
 999                 return;
1000         }
1001 #endif
1002         cli();
1003         fd_disable_dma();
1004         fd_clear_dma_ff();
1005         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1006                         DMA_MODE_READ : DMA_MODE_WRITE);
1007         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1008         fd_set_dma_count(raw_cmd->length);
1009         fd_enable_dma();
1010         sti();
1011         floppy_disable_hlt();
1012 }
1013 
1014 /* sends a command byte to the fdc */
1015 static int output_byte(char byte)
     /*  */
1016 {
1017         int counter;
1018         unsigned char status = 0;
1019         unsigned char rstatus;
1020 
1021         if (FDCS->reset)
1022                 return -1;
1023         for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
1024                 rstatus = fd_inb(FD_STATUS);
1025                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1026                 if (!(status & STATUS_READY))
1027                         continue;
1028                 if (status == STATUS_READY){
1029                         fd_outb(byte,FD_DATA);
1030 
1031 #ifdef FLOPPY_SANITY_CHECK
1032                         output_log[output_log_pos].data = byte;
1033                         output_log[output_log_pos].status = rstatus;
1034                         output_log[output_log_pos].jiffies = jiffies;
1035                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1036 #endif
1037                         return 0;
1038                 } else
1039                         break;
1040         }
1041         FDCS->reset = 1;
1042         if (!initialising)
1043                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1044                         byte, status);
1045         return -1;
1046 }
1047 #define LAST_OUT(x) if (output_byte(x)){ reset_fdc();return;}
1048 
1049 /* gets the response from the fdc */
1050 static int result(void)
     /*  */
1051 {
1052         int i = 0, counter, status = 0;
1053 
1054         if (FDCS->reset)
1055                 return -1;
1056         for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
1057                 status = fd_inb(FD_STATUS)&
1058                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1059                 if (!(status & STATUS_READY))
1060                         continue;
1061                 if (status == STATUS_READY){
1062 #ifdef FLOPPY_SANITY_CHECK
1063                         resultjiffies = jiffies;
1064                         resultsize = i;
1065 #endif
1066                         return i;
1067                 }
1068                 if (status & STATUS_DMA)
1069                         break;
1070                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1071                         if (i >= MAX_REPLIES) {
1072                                 DPRINT("floppy_stat reply overrun\n");
1073                                 break;
1074                         }
1075                         reply_buffer[i++] = fd_inb(FD_DATA);
1076                 }
1077         }
1078         FDCS->reset = 1;
1079         if (!initialising)
1080                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1081                         status, fdc, i);
1082         return -1;
1083 }
1084 
1085 /* Set perpendicular mode as required, based on data rate, if supported.
1086  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1087  */
1088 static inline void perpendicular_mode(void)
     /*  */
1089 {
1090         unsigned char perp_mode;
1091 
1092         if (raw_cmd->rate & 0x40){
1093                 switch(raw_cmd->rate & 3){
1094                         case 0:
1095                                 perp_mode=2;
1096                                 break;
1097                         case 3:
1098                                 perp_mode=3;
1099                                 break;
1100                         default:
1101                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1102                                 cont->done(0);
1103                                 FDCS->reset = 1; /* convenient way to return to
1104                                                   * redo without to much hassle (deep
1105                                                   * stack et al. */
1106                                 return;
1107                 }
1108         } else
1109                 perp_mode = 0;
1110 
1111         if (FDCS->perp_mode == perp_mode)
1112                 return;
1113         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1114                 output_byte(FD_PERPENDICULAR);
1115                 output_byte(perp_mode);
1116                 FDCS->perp_mode = perp_mode;
1117         } else if (perp_mode) {
1118                 DPRINT("perpendicular mode not supported by this FDC.\n");
1119         }
1120 } /* perpendicular_mode */
1121 
1122 #define NOMINAL_DTR 500
1123 
1124 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1125  * head load time, and DMA disable flag to values needed by floppy.
1126  *
1127  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1128  * to account for the data rate-based scaling done by the 82072 and 82077
1129  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1130  * 8272a).
1131  *
1132  * Note that changing the data transfer rate has a (probably deleterious)
1133  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1134  * fdc_specify is called again after each data transfer rate
1135  * change.
1136  *
1137  * srt: 1000 to 16000 in microseconds
1138  * hut: 16 to 240 milliseconds
1139  * hlt: 2 to 254 milliseconds
1140  *
1141  * These values are rounded up to the next highest available delay time.
1142  */
1143 static void fdc_specify(void)
     /*  */
1144 {
1145         unsigned char spec1, spec2;
1146         int srt, hlt, hut;
1147         unsigned long dtr = NOMINAL_DTR;
1148         unsigned long scale_dtr = NOMINAL_DTR;
1149         int hlt_max_code = 0x7f;
1150         int hut_max_code = 0xf;
1151 
1152         if (FDCS->need_configure && FDCS->has_fifo) {
1153                 if (FDCS->reset)
1154                         return;
1155                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1156                 /* TODO: lock this in via LOCK during initialization */
1157                 output_byte(FD_CONFIGURE);
1158                 output_byte(0);
1159                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1160                 output_byte(0);         /* precompensation from track 0 upwards */
1161                 if (FDCS->reset){
1162                         FDCS->has_fifo=0;
1163                         return;
1164                 }
1165                 FDCS->need_configure = 0;
1166                 /*DPRINT("FIFO enabled\n");*/
1167         }
1168 
1169         switch (raw_cmd->rate & 0x03) {
1170                 case 3:
1171                         dtr = 1000;
1172                         break;
1173                 case 1:
1174                         dtr = 300;
1175                         break;
1176                 case 2:
1177                         dtr = 250;
1178                         break;
1179         }
1180 
1181         if (FDCS->version >= FDC_82072) {
1182                 scale_dtr = dtr;
1183                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1184                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1185         }
1186 
1187         /* Convert step rate from microseconds to milliseconds and 4 bits */
1188         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1189         SUPBOUND(srt, 0xf);
1190         INFBOUND(srt, 0);
1191 
1192         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1193         if (hlt < 0x01)
1194                 hlt = 0x01;
1195         else if (hlt > 0x7f)
1196                 hlt = hlt_max_code;
1197 
1198         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1199         if (hut < 0x1)
1200                 hut = 0x1;
1201         else if (hut > 0xf)
1202                 hut = hut_max_code;
1203 
1204         spec1 = (srt << 4) | hut;
1205         spec2 = (hlt << 1);
1206 
1207         /* If these parameters did not change, just return with success */
1208         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1209                 /* Go ahead and set spec1 and spec2 */
1210                 output_byte(FD_SPECIFY);
1211                 output_byte(FDCS->spec1 = spec1);
1212                 output_byte(FDCS->spec2 = spec2);
1213         }
1214 } /* fdc_specify */
1215 
1216 /* Set the FDC's data transfer rate on behalf of the specified drive.
1217  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1218  * of the specify command (i.e. using the fdc_specify function).
1219  */
1220 static int fdc_dtr(void)
     /*  */
1221 {
1222         /* If data rate not already set to desired value, set it. */
1223         if ((raw_cmd->rate & 3) == FDCS->dtr)
1224                 return 0;
1225 
1226         /* Set dtr */
1227         fd_outb(raw_cmd->rate & 3, FD_DCR);
1228 
1229         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1230          * need a stabilization period of several milliseconds to be
1231          * enforced after data rate changes before R/W operations.
1232          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1233          */
1234         FDCS->dtr = raw_cmd->rate & 3;
1235         return(wait_for_completion(jiffies+2*HZ/100,
1236                                    (timeout_fn) floppy_ready));
1237 } /* fdc_dtr */
1238 
1239 static void tell_sector(void)
     /*  */
1240 {
1241         printk(": track %d, head %d, sector %d, size %d",
1242                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1243 } /* tell_sector */
1244 
1245 
1246 /*
1247  * Ok, this error interpreting routine is called after a
1248  * DMA read/write has succeeded
1249  * or failed, so we check the results, and copy any buffers.
1250  * hhb: Added better error reporting.
1251  * ak: Made this into a separate routine.
1252  */
1253 static int interpret_errors(void)
     /*  */
1254 {
1255         char bad;
1256 
1257         if (inr!=7) {
1258                 DPRINT("-- FDC reply error");
1259                 FDCS->reset = 1;
1260                 return 1;
1261         }
1262 
1263         /* check IC to find cause of interrupt */
1264         switch (ST0 & ST0_INTR) {
1265                 case 0x40:      /* error occurred during command execution */
1266                         bad = 1;
1267                         if (ST1 & ST1_WP) {
1268                                 DPRINT("Drive is write protected\n");
1269                                 CLEARF(FD_DISK_WRITABLE);
1270                                 cont->done(0);
1271                                 bad = 2;
1272                         } else if (ST1 & ST1_ND) {
1273                                 SETF(FD_NEED_TWADDLE);
1274                         } else if (ST1 & ST1_OR) {
1275                                 if (DP->flags & FTD_MSG)
1276                                         DPRINT("Over/Underrun - retrying\n");
1277                                 bad = 0;
1278                         }else if (*errors >= DP->max_errors.reporting){
1279                                 DPRINT("");
1280                                 if (ST0 & ST0_ECE) {
1281                                         printk("Recalibrate failed!");
1282                                 } else if (ST2 & ST2_CRC) {
1283                                         printk("data CRC error");
1284                                         tell_sector();
1285                                 } else if (ST1 & ST1_CRC) {
1286                                         printk("CRC error");
1287                                         tell_sector();
1288                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1289                                         if (!probing) {
1290                                                 printk("sector not found");
1291                                                 tell_sector();
1292                                         } else
1293                                                 printk("probe failed...");
1294                                 } else if (ST2 & ST2_WC) {      /* seek error */
1295                                         printk("wrong cylinder");
1296                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1297                                         printk("bad cylinder");
1298                                 } else {
1299                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1300                                         tell_sector();
1301                                 }
1302                                 printk("\n");
1303 
1304                         }
1305                         if (ST2 & ST2_WC || ST2 & ST2_BC)
1306                                 /* wrong cylinder => recal */
1307                                 DRS->track = NEED_2_RECAL;
1308                         return bad;
1309                 case 0x80: /* invalid command given */
1310                         DPRINT("Invalid FDC command given!\n");
1311                         cont->done(0);
1312                         return 2;
1313                 case 0xc0:
1314                         DPRINT("Abnormal termination caused by polling\n");
1315                         cont->error();
1316                         return 2;
1317                 default: /* (0) Normal command termination */
1318                         return 0;
1319         }
1320 }
1321 
1322 /*
1323  * This routine is called when everything should be correctly set up
1324  * for the transfer (ie floppy motor is on, the correct floppy is
1325  * selected, and the head is sitting on the right track).
1326  */
1327 static void setup_rw_floppy(void)
     /*  */
1328 {
1329         int i,ready_date,r, flags,dflags;
1330         timeout_fn function;
1331 
1332         flags = raw_cmd->flags;
1333         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1334                 flags |= FD_RAW_INTR;
1335 
1336         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1337                 ready_date = DRS->spinup_date + DP->spinup;
1338                 /* If spinup will take a long time, rerun scandrives
1339                  * again just before spinup completion. Beware that
1340                  * after scandrives, we must again wait for selection.
1341                  */
1342                 if (ready_date > jiffies + DP->select_delay){
1343                         ready_date -= DP->select_delay;
1344                         function = (timeout_fn) floppy_start;
1345                 } else
1346                         function = (timeout_fn) setup_rw_floppy;
1347 
1348                 /* wait until the floppy is spinning fast enough */
1349                 if (wait_for_completion(ready_date,function))
1350                         return;
1351         }
1352         dflags = DRS->flags;
1353 
1354         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1355                 setup_DMA();
1356 
1357         if (flags & FD_RAW_INTR)
1358                 SET_INTR(main_command_interrupt);
1359 
1360         r=0;
1361         for (i=0; i< raw_cmd->cmd_count; i++)
1362                 r|=output_byte(raw_cmd->cmd[i]);
1363 
1364 #ifdef DEBUGT
1365         debugt("rw_command: ");
1366 #endif
1367         if (r){
1368                 reset_fdc();
1369                 return;
1370         }
1371 
1372         if (!(flags & FD_RAW_INTR)){
1373                 inr = result();
1374                 cont->interrupt();
1375         } else if (flags & FD_RAW_NEED_DISK)
1376                 fd_watchdog();
1377 }
1378 
1379 static int blind_seek;
1380 
1381 /*
1382  * This is the routine called after every seek (or recalibrate) interrupt
1383  * from the floppy controller.
1384  */
1385 static void seek_interrupt(void)
     /*  */
1386 {
1387 #ifdef DEBUGT
1388         debugt("seek interrupt:");
1389 #endif
1390         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1391                 DPRINT("seek failed\n");
1392                 DRS->track = NEED_2_RECAL;
1393                 cont->error();
1394                 cont->redo();
1395                 return;
1396         }
1397         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1398 #ifdef DCL_DEBUG
1399                 if (DP->flags & FD_DEBUG){
1400                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1401                         DPRINT1("jiffies=%ld\n", jiffies);
1402                 }
1403 #endif
1404                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1405                 DRS->select_date = jiffies;
1406         }
1407         DRS->track = ST1;
1408         floppy_ready();
1409 }
1410 
1411 static void check_wp(void)
     /*  */
1412 {
1413         if (TESTF(FD_VERIFY)) {
1414                 /* check write protection */
1415                 output_byte(FD_GETSTATUS);
1416                 output_byte(UNIT(current_drive));
1417                 if (result() != 1){
1418                         FDCS->reset = 1;
1419                         return;
1420                 }
1421                 CLEARF(FD_VERIFY);
1422                 CLEARF(FD_NEED_TWADDLE);
1423 #ifdef DCL_DEBUG
1424                 if (DP->flags & FD_DEBUG){
1425                         DPRINT("checking whether disk is write protected\n");
1426                         DPRINT1("wp=%x\n",ST3 & 0x40);
1427                 }
1428 #endif
1429                 if (!(ST3  & 0x40))
1430                         SETF(FD_DISK_WRITABLE);
1431                 else
1432                         CLEARF(FD_DISK_WRITABLE);
1433         }
1434 }
1435 
1436 static void seek_floppy(void)
     /*  */
1437 {
1438         int track;
1439 
1440         blind_seek=0;
1441 
1442 #ifdef DCL_DEBUG
1443         if (DP->flags & FD_DEBUG){
1444                 DPRINT("calling disk change from seek\n");
1445         }
1446 #endif
1447 
1448         if (!TESTF(FD_DISK_NEWCHANGE) &&
1449             disk_change(current_drive) &&
1450             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1451                 /* the media changed flag should be cleared after the seek.
1452                  * If it isn't, this means that there is really no disk in
1453                  * the drive.
1454                  */
1455                 SETF(FD_DISK_CHANGED);
1456                 cont->done(0);
1457                 cont->redo();
1458                 return;
1459         }
1460         if (DRS->track <= NEED_1_RECAL){
1461                 recalibrate_floppy();
1462                 return;
1463         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1464                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1465                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1466                 /* we seek to clear the media-changed condition. Does anybody
1467                  * know a more elegant way, which works on all drives? */
1468                 if (raw_cmd->track)
1469                         track = raw_cmd->track - 1;
1470                 else {
1471                         if (DP->flags & FD_SILENT_DCL_CLEAR){
1472                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1473                                 blind_seek = 1;
1474                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1475                         }
1476                         track = 1;
1477                 }
1478         } else {
1479                 check_wp();
1480                 if (raw_cmd->track != DRS->track &&
1481                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1482                         track = raw_cmd->track;
1483                 else {
1484                         setup_rw_floppy();
1485                         return;
1486                 }
1487         }
1488 
1489         SET_INTR(seek_interrupt);
1490         output_byte(FD_SEEK);
1491         output_byte(UNIT(current_drive));
1492         LAST_OUT(track);
1493 #ifdef DEBUGT
1494         debugt("seek command:");
1495 #endif
1496 }
1497 
1498 static void recal_interrupt(void)
     /*  */
1499 {
1500 #ifdef DEBUGT
1501         debugt("recal interrupt:");
1502 #endif
1503         if (inr !=2)
1504                 FDCS->reset = 1;
1505         else if (ST0 & ST0_ECE) {
1506                 switch(DRS->track){
1507                         case NEED_1_RECAL:
1508 #ifdef DEBUGT
1509                                 debugt("recal interrupt need 1 recal:");
1510 #endif
1511                                 /* after a second recalibrate, we still haven't
1512                                  * reached track 0. Probably no drive. Raise an
1513                                  * error, as failing immediately might upset
1514                                  * computers possessed by the Devil :-) */
1515                                 cont->error();
1516                                 cont->redo();
1517                                 return;
1518                         case NEED_2_RECAL:
1519 #ifdef DEBUGT
1520                                 debugt("recal interrupt need 2 recal:");
1521 #endif
1522                                 /* If we already did a recalibrate,
1523                                  * and we are not at track 0, this
1524                                  * means we have moved. (The only way
1525                                  * not to move at recalibration is to
1526                                  * be already at track 0.) Clear the
1527                                  * new change flag */
1528 #ifdef DCL_DEBUG
1529                                 if (DP->flags & FD_DEBUG){
1530                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1531                                 }
1532 #endif
1533 
1534                                 CLEARF(FD_DISK_NEWCHANGE);
1535                                 DRS->select_date = jiffies;
1536                                 /* fall through */
1537                         default:
1538 #ifdef DEBUGT
1539                                 debugt("recal interrupt default:");
1540 #endif
1541                                 /* Recalibrate moves the head by at
1542                                  * most 80 steps. If after one
1543                                  * recalibrate we don't have reached
1544                                  * track 0, this might mean that we
1545                                  * started beyond track 80.  Try
1546                                  * again.  */
1547                                 DRS->track = NEED_1_RECAL;
1548                                 break;
1549                 }
1550         } else
1551                 DRS->track = ST1;
1552         floppy_ready();
1553 }
1554 
1555 /*
1556  * Unexpected interrupt - Print as much debugging info as we can...
1557  * All bets are off...
1558  */
1559 static void unexpected_floppy_interrupt(void)
     /*  */
1560 {
1561         int i;
1562         if (initialising)
1563                 return;
1564         if (print_unex){
1565                 DPRINT("unexpected interrupt\n");
1566                 if (inr >= 0)
1567                         for (i=0; i<inr; i++)
1568                                 printk("%d %x\n", i, reply_buffer[i]);
1569         }
1570         while(1){
1571                 output_byte(FD_SENSEI);
1572                 inr=result();
1573                 if (inr != 2)
1574                         break;
1575                 if (print_unex){
1576                         printk("sensei\n");
1577                         for (i=0; i<inr; i++)
1578                                 printk("%d %x\n", i, reply_buffer[i]);
1579                 }
1580         }
1581         FDCS->reset = 1;
1582 }
1583 
1584 static struct tq_struct floppy_tq =
1585 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1586 
1587 /* interrupt handler */
1588 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1589 {
1590         void (*handler)(void) = DEVICE_INTR;
1591 
1592         lasthandler = handler;
1593         interruptjiffies = jiffies;
1594 
1595         floppy_enable_hlt();
1596         CLEAR_INTR;
1597         if (fdc >= N_FDC || FDCS->address == -1){
1598                 /* we don't even know which FDC is the culprit */
1599                 printk("DOR0=%x\n", fdc_state[0].dor);
1600                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1601                 printk("handler=%p\n", handler);
1602                 is_alive("bizarre fdc");
1603                 return;
1604         }
1605         inr = result();
1606         if (!handler){
1607                 unexpected_floppy_interrupt();
1608                 is_alive("unexpected");
1609                 return;
1610         }
1611         if (inr == 0){
1612                 do {
1613                         output_byte(FD_SENSEI);
1614                         inr = result();
1615                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1616         }
1617         floppy_tq.routine = (void *)(void *) handler;
1618         queue_task_irq(&floppy_tq, &tq_timer);
1619         is_alive("normal interrupt end");
1620 }
1621 
1622 static void recalibrate_floppy(void)
     /*  */
1623 {
1624 #ifdef DEBUGT
1625         debugt("recalibrate floppy:");
1626 #endif
1627         SET_INTR(recal_interrupt);
1628         output_byte(FD_RECALIBRATE);
1629         LAST_OUT(UNIT(current_drive));
1630 }
1631 
1632 /*
1633  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1634  */
1635 static void reset_interrupt(void)
     /*  */
1636 {
1637 #ifdef DEBUGT
1638         debugt("reset interrupt:");
1639 #endif
1640         /* fdc_specify();          reprogram fdc */
1641         result();               /* get the status ready for set_fdc */
1642         if (FDCS->reset) {
1643                 printk("reset set in interrupt, calling %p\n", cont->error);
1644                 cont->error(); /* a reset just after a reset. BAD! */
1645         }
1646         cont->redo();
1647 }
1648 
1649 /*
1650  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1651  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1652  */
1653 static void reset_fdc(void)
     /*  */
1654 {
1655         SET_INTR(reset_interrupt);
1656         FDCS->reset = 0;
1657         reset_fdc_info(0);
1658         if (FDCS->version >= FDC_82077)
1659                 fd_outb(0x80 | (FDCS->dtr &3), FD_STATUS);
1660         else {
1661                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1662                 udelay(FD_RESET_DELAY);
1663                 outb(FDCS->dor, FD_DOR);
1664         }
1665 }
1666 
1667 static void empty(void)
     /*  */
1668 {
1669 }
1670 
1671 void show_floppy(void)
     /*  */
1672 {
1673         int i;
1674 
1675         printk("\n");
1676         printk("floppy driver state\n");
1677         printk("-------------------\n");
1678         printk("now=%ld last interrupt=%d last called handler=%p\n",
1679                jiffies, interruptjiffies, lasthandler);
1680 
1681 
1682 #ifdef FLOPPY_SANITY_CHECK
1683         printk("timeout_message=%s\n", timeout_message);
1684         printk("last output bytes:\n");
1685         for (i=0; i < OLOGSIZE; i++)
1686                 printk("%2x %2x %ld\n",
1687                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1688                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1689                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1690         printk("last result at %d\n", resultjiffies);
1691         printk("last redo_fd_request at %d\n", lastredo);
1692         for (i=0; i<resultsize; i++){
1693                 printk("%2x ", reply_buffer[i]);
1694         }
1695         printk("\n");
1696 #endif
1697 
1698         printk("status=%x\n", fd_inb(FD_STATUS));
1699         printk("fdc_busy=%d\n", fdc_busy);
1700         if (DEVICE_INTR)
1701                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1702         if (floppy_tq.sync)
1703                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1704         if (fd_timer.prev)
1705                 printk("fd_timer.function=%p\n", fd_timer.function);
1706         if (fd_timeout.prev){
1707                 printk("timer_table=%p\n",fd_timeout.function);
1708                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1709                 printk("now=%ld\n",jiffies);
1710         }
1711         printk("cont=%p\n", cont);
1712         printk("CURRENT=%p\n", CURRENT);
1713         printk("command_status=%d\n", command_status);
1714         printk("\n");
1715 }
1716 
1717 static void floppy_shutdown(void)
     /*  */
1718 {
1719         if (!initialising)
1720                 show_floppy();
1721         CLEAR_INTR;
1722         floppy_tq.routine = (void *)(void *) empty;
1723         del_timer(&fd_timer);
1724         sti();
1725 
1726         floppy_enable_hlt();
1727         fd_disable_dma();
1728         /* avoid dma going to a random drive after shutdown */
1729 
1730         if (!initialising)
1731                 DPRINT("floppy timeout\n");
1732         FDCS->reset = 1;
1733         if (cont){
1734                 cont->done(0);
1735                 cont->redo(); /* this will recall reset when needed */
1736         } else {
1737                 printk("no cont in shutdown!\n");
1738                 process_fd_request();
1739         }
1740         is_alive("floppy shutdown");
1741 }
1742 /*typedef void (*timeout_fn)(unsigned long);*/
1743 
1744 /* start motor, check media-changed condition and write protection */
1745 static int start_motor(void (*function)(void) )
     /*  */
1746 {
1747         int mask, data;
1748 
1749         mask = 0xfc;
1750         data = UNIT(current_drive);
1751         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1752                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))){
1753                         set_debugt();
1754                         /* no read since this drive is running */
1755                         DRS->first_read_date = 0;
1756                         /* note motor start time if motor is not yet running */
1757                         DRS->spinup_date = jiffies;
1758                         data |= (0x10 << UNIT(current_drive));
1759                 }
1760         } else
1761                 if (FDCS->dor & (0x10 << UNIT(current_drive)))
1762                         mask &= ~(0x10 << UNIT(current_drive));
1763 
1764         /* starts motor and selects floppy */
1765         del_timer(motor_off_timer + current_drive);
1766         set_dor(fdc, mask, data);
1767 
1768         /* wait_for_completion also schedules reset if needed. */
1769         return(wait_for_completion(DRS->select_date+DP->select_delay,
1770                                    (timeout_fn) function));
1771 }
1772 
1773 static void floppy_ready(void)
     /*  */
1774 {
1775         CHECK_RESET;
1776         if (start_motor(floppy_ready)) return;
1777         if (fdc_dtr()) return;
1778 
1779 #ifdef DCL_DEBUG
1780         if (DP->flags & FD_DEBUG){
1781                 DPRINT("calling disk change from floppy_ready\n");
1782         }
1783 #endif
1784 
1785         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1786            disk_change(current_drive) &&
1787            !DP->select_delay)
1788                 twaddle(); /* this clears the dcl on certain drive/controller
1789                             * combinations */
1790 
1791         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1792                 perpendicular_mode();
1793                 fdc_specify(); /* must be done here because of hut, hlt ... */
1794                 seek_floppy();
1795         } else
1796                 setup_rw_floppy();
1797 }
1798 
1799 static void floppy_start(void)
     /*  */
1800 {
1801         reschedule_timeout(CURRENTD, "floppy start", 0);
1802 
1803         scandrives();
1804 #ifdef DCL_DEBUG
1805         if (DP->flags & FD_DEBUG){
1806                 DPRINT("setting NEWCHANGE in floppy_start\n");
1807         }
1808 #endif
1809         SETF(FD_DISK_NEWCHANGE);
1810         floppy_ready();
1811 }
1812 
1813 /*
1814  * ========================================================================
1815  * here ends the bottom half. Exported routines are:
1816  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1817  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1818  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1819  * and set_dor.
1820  * ========================================================================
1821  */
1822 /*
1823  * General purpose continuations.
1824  * ==============================
1825  */
1826 
1827 static void do_wakeup(void)
     /*  */
1828 {
1829         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1830         cont = 0;
1831         command_status += 2;
1832         wake_up(&command_done);
1833 }
1834 
1835 static struct cont_t wakeup_cont={
1836         empty,
1837         do_wakeup,
1838         empty,
1839         (done_f)empty
1840 };
1841 
1842 static int wait_til_done(void (*handler)(void), int interruptible)
     /*  */
1843 {
1844         int ret;
1845 
1846         floppy_tq.routine = (void *)(void *) handler;
1847         queue_task(&floppy_tq, &tq_timer);
1848 
1849         cli();
1850         while(command_status < 2 && NO_SIGNAL){
1851                 is_alive("wait_til_done");
1852                 if (interruptible)
1853                         interruptible_sleep_on(&command_done);
1854                 else
1855                         sleep_on(&command_done);
1856         }
1857         if (command_status < 2){
1858                 floppy_shutdown();
1859                 sti();
1860                 process_fd_request();
1861                 return -EINTR;
1862         }
1863         sti();
1864 
1865         if (FDCS->reset)
1866                 command_status = FD_COMMAND_ERROR;
1867         if (command_status == FD_COMMAND_OKAY)
1868                 ret=0;
1869         else
1870                 ret=-EIO;
1871         command_status = FD_COMMAND_NONE;
1872         return ret;
1873 }
1874 
1875 static void generic_done(int result)
     /*  */
1876 {
1877         command_status = result;
1878         cont = &wakeup_cont;
1879 }
1880 
1881 static void generic_success(void)
     /*  */
1882 {
1883         cont->done(1);
1884 }
1885 
1886 static void generic_failure(void)
     /*  */
1887 {
1888         cont->done(0);
1889 }
1890 
1891 static void success_and_wakeup(void)
     /*  */
1892 {
1893         generic_success();
1894         cont->redo();
1895 }
1896 
1897 
1898 /*
1899  * formatting and rw support.
1900  * ==========================
1901  */
1902 
1903 static int next_valid_format(void)
     /*  */
1904 {
1905         int probed_format;
1906 
1907         probed_format = DRS->probed_format;
1908         while(1){
1909                 if (probed_format >= 8 ||
1910                      !DP->autodetect[probed_format]){
1911                         DRS->probed_format = 0;
1912                         return 1;
1913                 }
1914                 if (floppy_type[DP->autodetect[probed_format]].sect){
1915                         DRS->probed_format = probed_format;
1916                         return 0;
1917                 }
1918                 probed_format++;
1919         }
1920 }
1921 
1922 static void bad_flp_intr(void)
     /*  */
1923 {
1924         if (probing){
1925                 DRS->probed_format++;
1926                 if (!next_valid_format())
1927                         return;
1928         }
1929         (*errors)++;
1930         INFBOUND(DRWE->badness, *errors);
1931         if (*errors > DP->max_errors.abort)
1932                 cont->done(0);
1933         if (*errors > DP->max_errors.reset)
1934                 FDCS->reset = 1;
1935         else if (*errors > DP->max_errors.recal)
1936                 DRS->track = NEED_2_RECAL;
1937 }
1938 
1939 static void set_floppy(kdev_t device)
     /*  */
1940 {
1941         if (TYPE(device))
1942                 floppy = TYPE(device) + floppy_type;
1943         else
1944                 floppy = current_type[ DRIVE(device) ];
1945 }
1946 
1947 /*
1948  * formatting and support.
1949  * =======================
1950  */
1951 static void format_interrupt(void)
     /*  */
1952 {
1953         switch (interpret_errors()){
1954                 case 1:
1955                         cont->error();
1956                 case 2:
1957                         break;
1958                 case 0:
1959                         cont->done(1);
1960         }
1961         cont->redo();
1962 }
1963 
1964 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
1965 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
1966 #define CT(x) ((x) | 0x40)
1967 static void setup_format_params(int track)
     /*  */
1968 {
1969         struct fparm {
1970                 unsigned char track,head,sect,size;
1971         } *here = (struct fparm *)floppy_track_buffer;
1972         int il,n;
1973         int count,head_shift,track_shift;
1974 
1975         raw_cmd = &default_raw_cmd;
1976         raw_cmd->track = track;
1977 
1978         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1979                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1980         raw_cmd->rate = floppy->rate & 0x43;
1981         raw_cmd->cmd_count = NR_F;
1982         COMMAND = FM_MODE(floppy,FD_FORMAT);
1983         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
1984         F_SIZECODE = FD_SIZECODE(floppy);
1985         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1986         F_GAP = floppy->fmt_gap;
1987         F_FILL = FD_FILL_BYTE;
1988 
1989         raw_cmd->kernel_data = floppy_track_buffer;
1990         raw_cmd->length = 4 * F_SECT_PER_TRACK;
1991 
1992         /* allow for about 30ms for data transport per track */
1993         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1994 
1995         /* a ``cylinder'' is two tracks plus a little stepping time */
1996         track_shift = 2 * head_shift + 3;
1997 
1998         /* position of logical sector 1 on this track */
1999         n = (track_shift * format_req.track + head_shift * format_req.head)
2000                 % F_SECT_PER_TRACK;
2001 
2002         /* determine interleave */
2003         il = 1;
2004         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2005                 il++;
2006 
2007         /* initialize field */
2008         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2009                 here[count].track = format_req.track;
2010                 here[count].head = format_req.head;
2011                 here[count].sect = 0;
2012                 here[count].size = F_SIZECODE;
2013         }
2014         /* place logical sectors */
2015         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2016                 here[n].sect = count;
2017                 n = (n+il) % F_SECT_PER_TRACK;
2018                 if (here[n].sect) { /* sector busy, find next free sector */
2019                         ++n;
2020                         if (n>= F_SECT_PER_TRACK) {
2021                                 n-=F_SECT_PER_TRACK;
2022                                 while (here[n].sect) ++n;
2023                         }
2024                 }
2025         }
2026 }
2027 
2028 static void redo_format(void)
     /*  */
2029 {
2030         buffer_track = -1;
2031         setup_format_params(format_req.track << STRETCH(floppy));
2032         floppy_start();
2033 #ifdef DEBUGT
2034         debugt("queue format request");
2035 #endif
2036 }
2037 
2038 static struct cont_t format_cont={
2039         format_interrupt,
2040         redo_format,
2041         bad_flp_intr,
2042         generic_done };
2043 
2044 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /*  */
2045 {
2046         int ret;
2047         int drive=DRIVE(device);
2048 
2049         LOCK_FDC(drive,1);
2050         set_floppy(device);
2051         if (!floppy ||
2052             floppy->track > DP->tracks ||
2053             tmp_format_req->track >= floppy->track ||
2054             tmp_format_req->head >= floppy->head ||
2055             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2056             !floppy->fmt_gap) {
2057                 process_fd_request();
2058                 return -EINVAL;
2059         }
2060         format_req = *tmp_format_req;
2061         format_errors = 0;
2062         cont = &format_cont;
2063         errors = &format_errors;
2064         IWAIT(redo_format);
2065         process_fd_request();
2066         return ret;
2067 }
2068 
2069 /*
2070  * Buffer read/write and support
2071  * =============================
2072  */
2073 
2074 /* new request_done. Can handle physical sectors which are smaller than a
2075  * logical buffer */
2076 static void request_done(int uptodate)
     /*  */
2077 {
2078         int block;
2079 
2080         probing = 0;
2081         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2082 
2083         if (!CURRENT){
2084                 DPRINT("request list destroyed in floppy request done\n");
2085                 return;
2086         }
2087         if (uptodate){
2088                 /* maintain values for invalidation on geometry
2089                  * change */
2090                 block = current_count_sectors + CURRENT->sector;
2091                 INFBOUND(DRS->maxblock, block);
2092                 if (block > floppy->sect)
2093                         DRS->maxtrack = 1;
2094 
2095                 /* unlock chained buffers */
2096                 while (current_count_sectors && CURRENT &&
2097                        current_count_sectors >= CURRENT->current_nr_sectors){
2098                         current_count_sectors -= CURRENT->current_nr_sectors;
2099                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2100                         CURRENT->sector += CURRENT->current_nr_sectors;
2101                         end_request(1);
2102                 }
2103                 if (current_count_sectors && CURRENT){
2104                         /* "unlock" last subsector */
2105                         CURRENT->buffer += current_count_sectors <<9;
2106                         CURRENT->current_nr_sectors -= current_count_sectors;
2107                         CURRENT->nr_sectors -= current_count_sectors;
2108                         CURRENT->sector += current_count_sectors;
2109                         return;
2110                 }
2111 
2112                 if (current_count_sectors && !CURRENT)
2113                         DPRINT("request list destroyed in floppy request done\n");
2114 
2115         } else {
2116                 if (CURRENT->cmd == WRITE) {
2117                         /* record write error information */
2118                         DRWE->write_errors++;
2119                         if (DRWE->write_errors == 1) {
2120                                 DRWE->first_error_sector = CURRENT->sector;
2121                                 DRWE->first_error_generation = DRS->generation;
2122                         }
2123                         DRWE->last_error_sector = CURRENT->sector;
2124                         DRWE->last_error_generation = DRS->generation;
2125                 }
2126                 end_request(0);
2127         }
2128 }
2129 
2130 /* Interrupt handler evaluating the result of the r/w operation */
2131 static void rw_interrupt(void)
     /*  */
2132 {
2133         int nr_sectors, ssize;
2134 
2135         if (!DRS->first_read_date)
2136                 DRS->first_read_date = jiffies;
2137 
2138         nr_sectors = 0;
2139         CODE2SIZE;
2140         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2141                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2142                 (sector_t % floppy->sect) % ssize;
2143 
2144 #ifdef FLOPPY_SANITY_CHECK
2145         if (nr_sectors > current_count_sectors + ssize -
2146              (current_count_sectors + sector_t) % ssize +
2147              sector_t % ssize){
2148                 DPRINT2("long rw: %x instead of %lx\n",
2149                         nr_sectors, current_count_sectors);
2150                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2151                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2152                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2153                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2154                        sector_t, ssize);
2155         }
2156 #endif
2157         INFBOUND(nr_sectors,0);
2158         SUPBOUND(current_count_sectors, nr_sectors);
2159 
2160         switch (interpret_errors()){
2161                 case 2:
2162                         cont->redo();
2163                         return;
2164                 case 1:
2165                         if (!current_count_sectors){
2166                                 cont->error();
2167                                 cont->redo();
2168                                 return;
2169                         }
2170                         break;
2171                 case 0:
2172                         if (!current_count_sectors){
2173                                 cont->redo();
2174                                 return;
2175                         }
2176                         current_type[current_drive] = floppy;
2177                         floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
2178                         break;
2179         }
2180 
2181         if (probing) {
2182                 if (DP->flags & FTD_MSG)
2183                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2184                                 floppy->name,current_drive);
2185                 current_type[current_drive] = floppy;
2186                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2187                 probing = 0;
2188         }
2189 
2190         if (CT(COMMAND) != FD_READ || 
2191              raw_cmd->kernel_data == CURRENT->buffer){
2192                 /* transfer directly from buffer */
2193                 cont->done(1);
2194         } else if (CT(COMMAND) == FD_READ){
2195                 buffer_track = raw_cmd->track;
2196                 buffer_drive = current_drive;
2197                 INFBOUND(buffer_max, nr_sectors + sector_t);
2198         }
2199         cont->redo();
2200 }
2201 
2202 /* Compute maximal contiguous buffer size. */
2203 static int buffer_chain_size(void)
     /*  */
2204 {
2205         struct buffer_head *bh;
2206         int size;
2207         char *base;
2208 
2209         base = CURRENT->buffer;
2210         size = CURRENT->current_nr_sectors << 9;
2211         bh = CURRENT->bh;
2212 
2213         if (bh){
2214                 bh = bh->b_reqnext;
2215                 while (bh && bh->b_data == base + size){
2216                         size += bh->b_size;
2217                         bh = bh->b_reqnext;
2218                 }
2219         }
2220         return size >> 9;
2221 }
2222 
2223 /* Compute the maximal transfer size */
2224 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2225 {
2226         SUPBOUND(max_sector, sector_t + max_size);
2227 
2228         /* alignment */
2229         max_sector -= (max_sector % floppy->sect) % ssize;
2230 
2231         /* transfer size, beginning not aligned */
2232         current_count_sectors = max_sector - sector_t ;
2233 
2234         return max_sector;
2235 }
2236 
2237 /*
2238  * Move data from/to the track buffer to/from the buffer cache.
2239  */
2240 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2241 {
2242         int remaining; /* number of transferred 512-byte sectors */
2243         struct buffer_head *bh;
2244         char *buffer, *dma_buffer;
2245         int size;
2246 
2247         max_sector = transfer_size(ssize,
2248                                    minimum(max_sector, max_sector_2),
2249                                    CURRENT->nr_sectors);
2250 
2251         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2252             buffer_max > sector_t + CURRENT->nr_sectors)
2253                 current_count_sectors = minimum(buffer_max - sector_t,
2254                                                 CURRENT->nr_sectors);
2255 
2256         remaining = current_count_sectors << 9;
2257 #ifdef FLOPPY_SANITY_CHECK
2258         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2259             CT(COMMAND) == FD_WRITE){
2260                 DPRINT("in copy buffer\n");
2261                 printk("current_count_sectors=%ld\n", current_count_sectors);
2262                 printk("remaining=%d\n", remaining >> 9);
2263                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2264                 printk("CURRENT->current_nr_sectors=%ld\n",
2265                        CURRENT->current_nr_sectors);
2266                 printk("max_sector=%d\n", max_sector);
2267                 printk("ssize=%d\n", ssize);
2268         }
2269 #endif
2270 
2271         buffer_max = maximum(max_sector, buffer_max);
2272 
2273         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2274 
2275         bh = CURRENT->bh;
2276         size = CURRENT->current_nr_sectors << 9;
2277         buffer = CURRENT->buffer;
2278 
2279         while (remaining > 0){
2280                 SUPBOUND(size, remaining);
2281 #ifdef FLOPPY_SANITY_CHECK
2282                 if (dma_buffer + size >
2283                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2284                     dma_buffer < floppy_track_buffer){
2285                         DPRINT1("buffer overrun in copy buffer %d\n",
2286                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2287                         printk("sector_t=%d buffer_min=%d\n",
2288                                sector_t, buffer_min);
2289                         printk("current_count_sectors=%ld\n",
2290                                current_count_sectors);
2291                         if (CT(COMMAND) == FD_READ)
2292                                 printk("read\n");
2293                         if (CT(COMMAND) == FD_READ)
2294                                 printk("write\n");
2295                         break;
2296                 }
2297                 if (((unsigned long)buffer) % 512)
2298                         DPRINT1("%p buffer not aligned\n", buffer);
2299 #endif
2300                 if (CT(COMMAND) == FD_READ) {
2301                         fd_cacheflush(dma_buffer, size);
2302                         memcpy(buffer, dma_buffer, size);
2303                 } else {
2304                         memcpy(dma_buffer, buffer, size);
2305                         fd_cacheflush(dma_buffer, size);
2306                 }
2307                 remaining -= size;
2308                 if (!remaining)
2309                         break;
2310 
2311                 dma_buffer += size;
2312                 bh = bh->b_reqnext;
2313 #ifdef FLOPPY_SANITY_CHECK
2314                 if (!bh){
2315                         DPRINT("bh=null in copy buffer after copy\n");
2316                         break;
2317                 }
2318 #endif
2319                 size = bh->b_size;
2320                 buffer = bh->b_data;
2321         }
2322 #ifdef FLOPPY_SANITY_CHECK
2323         if (remaining){
2324                 if (remaining > 0)
2325                         max_sector -= remaining >> 9;
2326                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2327         }
2328 #endif
2329 }
2330 
2331 /*
2332  * Formulate a read/write request.
2333  * this routine decides where to load the data (directly to buffer, or to
2334  * tmp floppy area), how much data to load (the size of the buffer, the whole
2335  * track, or a single sector)
2336  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2337  * allocation on the fly, it should be done here. No other part should need
2338  * modification.
2339  */
2340 
2341 static int make_raw_rw_request(void)
     /*  */
2342 {
2343         int aligned_sector_t;
2344         int max_sector, max_size, tracksize, ssize;
2345 
2346         set_fdc(DRIVE(CURRENT->rq_dev));
2347 
2348         raw_cmd = &default_raw_cmd;
2349         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2350                 FD_RAW_NEED_SEEK;
2351         raw_cmd->cmd_count = NR_RW;
2352         if (CURRENT->cmd == READ){
2353                 raw_cmd->flags |= FD_RAW_READ;
2354                 COMMAND = FM_MODE(floppy,FD_READ);
2355         } else if (CURRENT->cmd == WRITE){
2356                 raw_cmd->flags |= FD_RAW_WRITE;
2357                 COMMAND = FM_MODE(floppy,FD_WRITE);
2358         } else {
2359                 DPRINT("make_raw_rw_request: unknown command\n");
2360                 return 0;
2361         }
2362 
2363         max_sector = floppy->sect * floppy->head;
2364 
2365         TRACK = CURRENT->sector / max_sector;
2366         sector_t = CURRENT->sector % max_sector;
2367         if (floppy->track && TRACK >= floppy->track)
2368                 return 0;
2369         HEAD = sector_t / floppy->sect;
2370 
2371         if (((floppy->stretch & FD_SWAPSIDES) || TESTF(FD_NEED_TWADDLE)) &&
2372             sector_t < floppy->sect)
2373                 max_sector = floppy->sect;
2374 
2375         /* 2M disks have phantom sectors on the first track */
2376         if ((floppy->rate & FD_2M) && (!TRACK) && (!HEAD)){
2377                 max_sector = 2 * floppy->sect / 3;
2378                 if (sector_t >= max_sector){
2379                         current_count_sectors = minimum(floppy->sect - sector_t,
2380                                                         CURRENT->nr_sectors);
2381                         return 1;
2382                 }
2383                 SIZECODE = 2;
2384         } else
2385                 SIZECODE = FD_SIZECODE(floppy);
2386         raw_cmd->rate = floppy->rate & 0x43;
2387         if ((floppy->rate & FD_2M) &&
2388             (TRACK || HEAD) &&
2389             raw_cmd->rate == 2)
2390                 raw_cmd->rate = 1;
2391 
2392         if (SIZECODE)
2393                 SIZECODE2 = 0xff;
2394         else
2395                 SIZECODE2 = 0x80;
2396         raw_cmd->track = TRACK << STRETCH(floppy);
2397         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2398         GAP = floppy->gap;
2399         CODE2SIZE;
2400         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2401         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2402         tracksize = floppy->sect - floppy->sect % ssize;
2403         if (tracksize < floppy->sect){
2404                 SECT_PER_TRACK ++;
2405                 if (tracksize <= sector_t % floppy->sect)
2406                         SECTOR--;
2407                 while (tracksize <= sector_t % floppy->sect){
2408                         while(tracksize + ssize > floppy->sect){
2409                                 SIZECODE--;
2410                                 ssize >>= 1;
2411                         }
2412                         SECTOR++; SECT_PER_TRACK ++;
2413                         tracksize += ssize;
2414                 }
2415                 max_sector = HEAD * floppy->sect + tracksize;
2416         } else if (!TRACK && !HEAD && !(floppy->rate & FD_2M) && probing)
2417                 max_sector = floppy->sect;
2418 
2419         aligned_sector_t = sector_t - (sector_t % floppy->sect) % ssize;
2420         max_size = CURRENT->nr_sectors;
2421         if ((raw_cmd->track == buffer_track) && 
2422             (current_drive == buffer_drive) &&
2423             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2424                 /* data already in track buffer */
2425                 if (CT(COMMAND) == FD_READ) {
2426                         copy_buffer(1, max_sector, buffer_max);
2427                         return 1;
2428                 }
2429         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2430                 if (CT(COMMAND) == FD_WRITE){
2431                         if (sector_t + CURRENT->nr_sectors > ssize &&
2432                             sector_t + CURRENT->nr_sectors < ssize + ssize)
2433                                 max_size = ssize + ssize;
2434                         else
2435                                 max_size = ssize;
2436                 }
2437                 raw_cmd->flags &= ~FD_RAW_WRITE;
2438                 raw_cmd->flags |= FD_RAW_READ;
2439                 COMMAND = FM_MODE(floppy,FD_READ);
2440         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS) {
2441                 unsigned long dma_limit;
2442                 int direct, indirect;
2443 
2444                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2445                         sector_t;
2446 
2447                 /*
2448                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2449                  * on a 64 bit machine!
2450                  */
2451                 max_size = buffer_chain_size();
2452                 dma_limit = (MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer)) >> 9;
2453                 if ((unsigned long) max_size > dma_limit) {
2454                         max_size = dma_limit;
2455                 }
2456                 /* 64 kb boundaries */
2457                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2458                         max_size = (K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2459                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2460                 /*
2461                  * We try to read tracks, but if we get too many errors, we
2462                  * go back to reading just one sector at a time.
2463                  *
2464                  * This means we should be able to read a sector even if there
2465                  * are other bad sectors on this track.
2466                  */
2467                 if (!direct ||
2468                     (indirect * 2 > direct * 3 &&
2469                      *errors < DP->max_errors.read_track &&
2470                      /*!TESTF(FD_NEED_TWADDLE) &&*/
2471                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2472                         max_size = CURRENT->nr_sectors;
2473                 } else {
2474                         raw_cmd->kernel_data = CURRENT->buffer;
2475                         raw_cmd->length = current_count_sectors << 9;
2476                         if (raw_cmd->length == 0){
2477                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2478                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2479                                         indirect, direct, sector_t);
2480                                 return 0;
2481                         }
2482                         return 2;
2483                 }
2484         }
2485 
2486         if (CT(COMMAND) == FD_READ)
2487                 max_size = max_sector; /* unbounded */
2488 
2489         /* claim buffer track if needed */
2490         if (buffer_track != raw_cmd->track ||  /* bad track */
2491             buffer_drive !=current_drive || /* bad drive */
2492             sector_t > buffer_max ||
2493             sector_t < buffer_min ||
2494             ((CT(COMMAND) == FD_READ ||
2495               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize))&&
2496              max_sector > 2 * max_buffer_sectors + buffer_min &&
2497              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2498             /* not enough space */){
2499                 buffer_track = -1;
2500                 buffer_drive = current_drive;
2501                 buffer_max = buffer_min = aligned_sector_t;
2502         }
2503         raw_cmd->kernel_data = floppy_track_buffer + 
2504                 ((aligned_sector_t-buffer_min)<<9);
2505 
2506         if (CT(COMMAND) == FD_WRITE){
2507                 /* copy write buffer to track buffer.
2508                  * if we get here, we know that the write
2509                  * is either aligned or the data already in the buffer
2510                  * (buffer will be overwritten) */
2511 #ifdef FLOPPY_SANITY_CHECK
2512                 if (sector_t != aligned_sector_t && buffer_track == -1)
2513                         DPRINT("internal error offset !=0 on write\n");
2514 #endif
2515                 buffer_track = raw_cmd->track;
2516                 buffer_drive = current_drive;
2517                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2518         } else
2519                 transfer_size(ssize, max_sector,
2520                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2521 
2522         /* round up current_count_sectors to get dma xfer size */
2523         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2524         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2525         raw_cmd->length <<= 9;
2526 #ifdef FLOPPY_SANITY_CHECK
2527         if ((raw_cmd->length < current_count_sectors << 9) ||
2528             (raw_cmd->kernel_data != CURRENT->buffer &&
2529              CT(COMMAND) == FD_WRITE &&
2530              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2531               aligned_sector_t < buffer_min)) ||
2532             raw_cmd->length % (128 << SIZECODE) ||
2533             raw_cmd->length <= 0 || current_count_sectors <= 0){
2534                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2535                         raw_cmd->length, current_count_sectors);
2536                 if (raw_cmd->kernel_data != CURRENT->buffer)
2537                         printk("addr=%d, length=%ld\n",
2538                                (int) ((raw_cmd->kernel_data - 
2539                                        floppy_track_buffer) >> 9),
2540                                current_count_sectors);
2541                 printk("st=%d ast=%d mse=%d msi=%d\n",
2542                        sector_t, aligned_sector_t, max_sector, max_size);
2543                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2544                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2545                        COMMAND, SECTOR, HEAD, TRACK);
2546                 printk("buffer drive=%d\n", buffer_drive);
2547                 printk("buffer track=%d\n", buffer_track);
2548                 printk("buffer_min=%d\n", buffer_min);
2549                 printk("buffer_max=%d\n", buffer_max);
2550                 return 0;
2551         }
2552 
2553         if (raw_cmd->kernel_data != CURRENT->buffer){
2554                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2555                     current_count_sectors < 0 ||
2556                     raw_cmd->length < 0 ||
2557                     raw_cmd->kernel_data + raw_cmd->length >
2558                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2559                         DPRINT("buffer overrun in schedule dma\n");
2560                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2561                                sector_t, buffer_min,
2562                                raw_cmd->length >> 9);
2563                         printk("current_count_sectors=%ld\n",
2564                                current_count_sectors);
2565                         if (CT(COMMAND) == FD_READ)
2566                                 printk("read\n");
2567                         if (CT(COMMAND) == FD_READ)
2568                                 printk("write\n");
2569                         return 0;
2570                 }
2571         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2572                    current_count_sectors > CURRENT->nr_sectors){
2573                 DPRINT("buffer overrun in direct transfer\n");
2574                 return 0;
2575         } else if (raw_cmd->length < current_count_sectors << 9){
2576                 DPRINT("more sectors than bytes\n");
2577                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2578                 printk("sectors=%ld\n", current_count_sectors);
2579         }
2580         if (raw_cmd->length == 0){
2581                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2582                 return 0;
2583         }
2584 #endif
2585         return 2;
2586 }
2587 
2588 static void redo_fd_request(void)
     /*  */
2589 {
2590 #define REPEAT {request_done(0); continue; }
2591         kdev_t device;
2592         int tmp;
2593 
2594         lastredo = jiffies;
2595         if (current_drive < N_DRIVE)
2596                 floppy_off(current_drive);
2597 
2598         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2599                 DPRINT("current not active!\n");
2600                 return;
2601         }
2602 
2603         while(1){
2604                 if (!CURRENT) {
2605                         CLEAR_INTR;
2606                         unlock_fdc();
2607                         return;
2608                 }
2609                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2610                         panic(DEVICE_NAME ": request list destroyed");
2611                 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
2612                         panic(DEVICE_NAME ": block not locked");
2613 
2614                 device = CURRENT->rq_dev;
2615                 set_fdc(DRIVE(device));
2616                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2617 
2618                 set_floppy(device);
2619                 raw_cmd = & default_raw_cmd;
2620                 raw_cmd->flags = 0;
2621                 if (start_motor(redo_fd_request)) return;
2622                 if (test_bit(current_drive, &fake_change) ||
2623                    TESTF(FD_DISK_CHANGED)){
2624                         DPRINT("disk absent or changed during operation\n");
2625                         REPEAT;
2626                 }
2627                 if (!floppy) { /* Autodetection */
2628                         if (!probing){
2629                                 DRS->probed_format = 0;
2630                                 if (next_valid_format()){
2631                                         DPRINT("no autodetectable formats\n");
2632                                         floppy = NULL;
2633                                         REPEAT;
2634                                 }
2635                         }
2636                         probing = 1;
2637                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2638                 } else
2639                         probing = 0;
2640                 errors = & (CURRENT->errors);
2641                 tmp = make_raw_rw_request();
2642                 if (tmp < 2){
2643                         request_done(tmp);
2644                         continue;
2645                 }
2646 
2647                 if (TESTF(FD_NEED_TWADDLE))
2648                         twaddle();
2649                 floppy_tq.routine = (void *)(void *) floppy_start;
2650                 queue_task(&floppy_tq, &tq_timer);
2651 #ifdef DEBUGT
2652                 debugt("queue fd request");
2653 #endif
2654                 return;
2655         }
2656 #undef REPEAT
2657 }
2658 
2659 static struct cont_t rw_cont={
2660         rw_interrupt,
2661         redo_fd_request,
2662         bad_flp_intr,
2663         request_done };
2664 
2665 static struct tq_struct request_tq =
2666 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2667 
2668 static void process_fd_request(void)
     /*  */
2669 {
2670         cont = &rw_cont;
2671         queue_task(&request_tq, &tq_timer);
2672 }
2673 
2674 static void do_fd_request(void)
     /*  */
2675 {
2676         if (fdc_busy){
2677                 /* fdc busy, this new request will be treated when the
2678                    current one is done */
2679                 is_alive("do fd request, old request running");
2680                 return;
2681         }
2682         lock_fdc(MAXTIMEOUT,0);
2683         process_fd_request();
2684         is_alive("do fd request");
2685 }
2686 
2687 static struct cont_t poll_cont={
2688         success_and_wakeup,
2689         floppy_ready,
2690         generic_failure,
2691         generic_done };
2692 
2693 static int poll_drive(int interruptible, int flag)
     /*  */
2694 {
2695         int ret;
2696         /* no auto-sense, just clear dcl */
2697         raw_cmd = &default_raw_cmd;
2698         raw_cmd->flags= flag;
2699         raw_cmd->track=0;
2700         raw_cmd->cmd_count=0;
2701         cont = &poll_cont;
2702 #ifdef DCL_DEBUG
2703         if (DP->flags & FD_DEBUG){
2704                 DPRINT("setting NEWCHANGE in poll_drive\n");
2705         }
2706 #endif
2707         SETF(FD_DISK_NEWCHANGE);
2708         WAIT(floppy_ready);
2709         return ret;
2710 }
2711 
2712 /*
2713  * User triggered reset
2714  * ====================
2715  */
2716 
2717 static void reset_intr(void)
     /*  */
2718 {
2719         printk("weird, reset interrupt called\n");
2720 }
2721 
2722 static struct cont_t reset_cont={
2723         reset_intr,
2724         success_and_wakeup,
2725         generic_failure,
2726         generic_done };
2727 
2728 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2729 {
2730         int ret;
2731 
2732         ret=0;
2733         LOCK_FDC(drive,interruptible);
2734         if (arg == FD_RESET_ALWAYS)
2735                 FDCS->reset=1;
2736         if (FDCS->reset){
2737                 cont = &reset_cont;
2738                 WAIT(reset_fdc);
2739         }
2740         process_fd_request();
2741         return ret;
2742 }
2743 
2744 /*
2745  * Misc Ioctl's and support
2746  * ========================
2747  */
2748 static int fd_copyout(void *param, const void *address, int size)
     /*  */
2749 {
2750         int ret;
2751 
2752         ECALL(verify_area(VERIFY_WRITE,param,size));
2753         fd_cacheflush(address, size); /* is this necessary ??? */
2754         /* Ralf: Yes; only the l2 cache is completly chipset
2755            controlled */
2756         memcpy_tofs(param,(void *) address, size);
2757         return 0;
2758 }
2759 
2760 static int fd_copyin(void *param, void *address, int size)
     /*  */
2761 {
2762         int ret;
2763 
2764         ECALL(verify_area(VERIFY_READ,param,size));
2765         memcpy_fromfs((void *) address, param, size);
2766         return 0;
2767 }
2768 
2769 #define COPYOUT(x) ECALL(fd_copyout((void *)param, &(x), sizeof(x)))
2770 #define COPYIN(x) ECALL(fd_copyin((void *)param, &(x), sizeof(x)))
2771 
2772 static inline const char *drive_name(int type, int drive)
     /*  */
2773 {
2774         struct floppy_struct *floppy;
2775 
2776         if (type)
2777                 floppy = floppy_type + type;
2778         else {
2779                 if (UDP->native_format)
2780                         floppy = floppy_type + UDP->native_format;
2781                 else
2782                         return "(null)";
2783         }
2784         if (floppy->name)
2785                 return floppy->name;
2786         else
2787                 return "(null)";
2788 }
2789 
2790 
2791 /* raw commands */
2792 static void raw_cmd_done(int flag)
     /*  */
2793 {
2794         int i;
2795 
2796         if (!flag) {
2797                 raw_cmd->flags = FD_RAW_FAILURE;
2798                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2799         } else {
2800                 raw_cmd->reply_count = inr;
2801                 for (i=0; i< raw_cmd->reply_count; i++)
2802                         raw_cmd->reply[i] = reply_buffer[i];
2803 
2804                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE))
2805                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2806                 
2807                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2808                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2809                         raw_cmd->flags |= FD_RAW_FAILURE;
2810 
2811                 if (disk_change(current_drive))
2812                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2813                 else
2814                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2815                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2816                         motor_off_callback(current_drive);
2817 
2818                 if (raw_cmd->next &&
2819                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2820                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2821                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2822                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2823                         raw_cmd = raw_cmd->next;
2824                         return;
2825                 }
2826         }
2827         generic_done(flag);
2828 }
2829 
2830 
2831 static struct cont_t raw_cmd_cont={
2832         success_and_wakeup,
2833         floppy_start,
2834         generic_failure,
2835         raw_cmd_done
2836 };
2837 
2838 static inline int raw_cmd_copyout(int cmd, char *param,
     /*  */
2839                                   struct floppy_raw_cmd *ptr)
2840 {
2841         struct old_floppy_raw_cmd old_raw_cmd;
2842         int ret;
2843 
2844         while(ptr) {
2845                 if (cmd == OLDFDRAWCMD) {
2846                         old_raw_cmd.flags = ptr->flags;
2847                         old_raw_cmd.data = ptr->data;
2848                         old_raw_cmd.length = ptr->length;
2849                         old_raw_cmd.rate = ptr->rate;
2850                         old_raw_cmd.reply_count = ptr->reply_count;
2851                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2852                         COPYOUT(old_raw_cmd);
2853                         param += sizeof(old_raw_cmd);
2854                 } else {
2855                         COPYOUT(*ptr);
2856                         param += sizeof(struct floppy_raw_cmd);
2857                 }
2858 
2859                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2860                         if (ptr->length>=0 && ptr->length<=ptr->buffer_length)
2861                                 ECALL(fd_copyout(ptr->data, 
2862                                                  ptr->kernel_data, 
2863                                                  ptr->buffer_length - 
2864                                                  ptr->length));
2865                 }
2866                 ptr = ptr->next;
2867         }
2868         return 0;
2869 }
2870 
2871 
2872 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /*  */
2873 {
2874         struct floppy_raw_cmd *next,*this;
2875 
2876         this = *ptr;
2877         *ptr = 0;
2878         while(this) {
2879                 if (this->buffer_length) {
2880                         free_pages((unsigned long)this->kernel_data,
2881                                    __get_order(this->buffer_length));
2882                         this->buffer_length = 0;
2883                 }
2884                 next = this->next;
2885                 kfree(this);
2886                 this = next;
2887         }
2888 }
2889 
2890 
2891 static inline int raw_cmd_copyin(int cmd, char *param,
     /*  */
2892                                  struct floppy_raw_cmd **rcmd)
2893 {
2894         struct floppy_raw_cmd *ptr;
2895         struct old_floppy_raw_cmd old_raw_cmd;
2896         int ret;
2897         int i;
2898         
2899         *rcmd = 0;
2900         while(1) {
2901                 ptr = (struct floppy_raw_cmd *) 
2902                         kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
2903                 if (!ptr)
2904                         return -ENOMEM;
2905                 *rcmd = ptr;
2906                 if (cmd == OLDFDRAWCMD){
2907                         COPYIN(old_raw_cmd);
2908                         ptr->flags = old_raw_cmd.flags;
2909                         ptr->data = old_raw_cmd.data;
2910                         ptr->length = old_raw_cmd.length;
2911                         ptr->rate = old_raw_cmd.rate;
2912                         ptr->cmd_count = old_raw_cmd.cmd_count;
2913                         ptr->track = old_raw_cmd.track;
2914                         ptr->phys_length = 0;
2915                         ptr->next = 0;
2916                         ptr->buffer_length = 0;
2917                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
2918                         param += sizeof(struct old_floppy_raw_cmd);
2919                         if (ptr->cmd_count > 9)
2920                                 return -EINVAL;
2921                 } else {
2922                         COPYIN(*ptr);
2923                         ptr->next = 0;
2924                         ptr->buffer_length = 0;
2925                         param += sizeof(struct floppy_raw_cmd);
2926                         if (ptr->cmd_count > 16)
2927                                 return -EINVAL;
2928                 }
2929 
2930                 for (i=0; i< 16; i++)
2931                         ptr->reply[i] = 0;
2932                 ptr->resultcode = 0;
2933                 ptr->kernel_data = 0;
2934 
2935                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
2936                         if (ptr->length <= 0)
2937                                 return -EINVAL;
2938                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
2939                         if (!ptr->kernel_data)
2940                                 return -ENOMEM;
2941                         ptr->buffer_length = ptr->length;
2942                 }
2943                 if ( ptr->flags & FD_RAW_READ )
2944                     ECALL( verify_area( VERIFY_WRITE, ptr->data, 
2945                                         ptr->length ));
2946                 if (ptr->flags & FD_RAW_WRITE)
2947                         ECALL(fd_copyin(ptr->data, ptr->kernel_data, 
2948                                         ptr->length));
2949                 rcmd = & (ptr->next);
2950                 if (!(ptr->flags & FD_RAW_MORE))
2951                         return 0;
2952                 ptr->rate &= 0x43;
2953         }
2954 }
2955 
2956 
2957 static int raw_cmd_ioctl(int cmd, void *param)
     /*  */
2958 {
2959         int drive, ret, ret2;
2960         struct floppy_raw_cmd *my_raw_cmd;
2961 
2962         if (FDCS->rawcmd <= 1)
2963                 FDCS->rawcmd = 1;
2964         for (drive= 0; drive < N_DRIVE; drive++){
2965                 if (FDC(drive) != fdc)
2966                         continue;
2967                 if (drive == current_drive){
2968                         if (UDRS->fd_ref > 1){
2969                                 FDCS->rawcmd = 2;
2970                                 break;
2971                         }
2972                 } else if (UDRS->fd_ref){
2973                         FDCS->rawcmd = 2;
2974                         break;
2975                 }
2976         }
2977 
2978         if (FDCS->reset)
2979                 return -EIO;
2980 
2981         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
2982         if (ret) {
2983                 raw_cmd_free(&my_raw_cmd);
2984                 return ret;
2985         }
2986 
2987         raw_cmd = my_raw_cmd;
2988         cont = &raw_cmd_cont;
2989         ret=wait_til_done(floppy_start,1);
2990 #ifdef DCL_DEBUG
2991         if (DP->flags & FD_DEBUG){
2992                 DPRINT("calling disk change from raw_cmd ioctl\n");
2993         }
2994 #endif
2995 
2996         if (ret != -EINTR && FDCS->reset)
2997                 ret = -EIO;
2998 
2999         DRS->track = NO_TRACK;
3000 
3001         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3002         if (!ret)
3003                 ret = ret2;
3004         raw_cmd_free(&my_raw_cmd);
3005         return ret;
3006 }
3007 
3008 static int invalidate_drive(kdev_t rdev)
     /*  */
3009 {
3010         /* invalidate the buffer track to force a reread */
3011         set_bit(DRIVE(rdev), &fake_change);
3012         process_fd_request();
3013         check_disk_change(rdev);
3014         return 0;
3015 }
3016 
3017 
3018 static inline void clear_write_error(int drive)
     /*  */
3019 {
3020         CLEARSTRUCT(UDRWE);
3021 }
3022 
3023 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
     /*  */
3024                                int drive, int type, int device)
3025 {
3026         int cnt;
3027 
3028         /* sanity checking for parameters.*/
3029         if (g->sect <= 0 ||
3030             g->head <= 0 ||
3031             g->track <= 0 ||
3032             g->track > UDP->tracks>>STRETCH(g) ||
3033             /* check if reserved bits are set */
3034             (g->stretch&~(FD_STRETCH|FD_SWAPSIDES)) != 0)
3035                 return -EINVAL;
3036         if (type){
3037                 if (!suser())
3038                         return -EPERM;
3039                 LOCK_FDC(drive,1);
3040                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3041                         if (TYPE(drive_state[cnt].fd_device) == type &&
3042                             drive_state[cnt].fd_ref)
3043                                 set_bit(drive, &fake_change);
3044                 }
3045                 floppy_type[type] = *g;
3046                 floppy_type[type].name="user format";
3047                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3048                         floppy_sizes[cnt]= floppy_sizes[cnt+0x80]=
3049                                 floppy_type[type].size>>1;
3050                 process_fd_request();
3051                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3052                         if (TYPE(drive_state[cnt].fd_device) == type &&
3053                             drive_state[cnt].fd_ref)
3054                                 check_disk_change(
3055                                         MKDEV(FLOPPY_MAJOR,
3056                                               drive_state[cnt].fd_device));
3057                 }
3058         } else {
3059                 LOCK_FDC(drive,1);
3060                 if (cmd != FDDEFPRM)
3061                         /* notice a disk change immediately, else
3062                          * we loose our settings immediately*/
3063                         CALL(poll_drive(1,0));
3064                 user_params[drive] = *g;
3065                 if (buffer_drive == drive)
3066                         SUPBOUND(buffer_max, user_params[drive].sect);
3067                 current_type[drive] = &user_params[drive];
3068                 floppy_sizes[drive] = user_params[drive].size >> 1;
3069                 if (cmd == FDDEFPRM)
3070                         DRS->keep_data = -1;
3071                 else
3072                         DRS->keep_data = 1;
3073                 /* invalidation. Invalidate only when needed, i.e.
3074                  * when there are already sectors in the buffer cache
3075                  * whose number will change. This is useful, because
3076                  * mtools often changes the geometry of the disk after
3077                  * looking at the boot block */
3078                 if (DRS->maxblock > user_params[drive].sect || DRS->maxtrack)
3079                         invalidate_drive(device);
3080                 else
3081                         process_fd_request();
3082         }
3083         return 0;
3084 }
3085 
3086 /* handle obsolete ioctl's */
3087 static struct translation_entry {
3088     int newcmd;
3089     int oldcmd;
3090     int oldsize; /* size of 0x00xx-style ioctl. Reflects old structures, thus
3091                   * use numeric values. NO SIZEOFS */
3092 } translation_table[]= {
3093     {FDCLRPRM,           0,  0},
3094     {FDSETPRM,           1, 28},
3095     {FDDEFPRM,           2, 28},
3096     {FDGETPRM,           3, 28},
3097     {FDMSGON,            4,  0},
3098     {FDMSGOFF,           5,  0},
3099     {FDFMTBEG,           6,  0},
3100     {FDFMTTRK,           7, 12},
3101     {FDFMTEND,           8,  0},
3102     {FDSETEMSGTRESH,    10,  0},
3103     {FDFLUSH,           11,  0},
3104     {FDSETMAXERRS,      12, 20},
3105     {OLDFDRAWCMD,       30,  0},
3106     {FDGETMAXERRS,      14, 20},
3107     {FDGETDRVTYP,       16, 16},
3108     {FDSETDRVPRM,       20, 88},
3109     {FDGETDRVPRM,       21, 88},
3110     {FDGETDRVSTAT,      22, 52},
3111     {FDPOLLDRVSTAT,     23, 52},
3112     {FDRESET,           24,  0},
3113     {FDGETFDCSTAT,      25, 40},
3114     {FDWERRORCLR,       27,  0},
3115     {FDWERRORGET,       28, 24},
3116     {FDRAWCMD,           0,  0},
3117     {FDTWADDLE,         40,  0} };
3118 
3119 static inline int normalize_0x02xx_ioctl(int *cmd, int *size)
     /*  */
3120 {
3121         int i, orig_size, ocmd;
3122 
3123         orig_size = _IOC_SIZE(*cmd);
3124         ocmd = *cmd;
3125         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3126                 if ((*cmd & 0xff3f) == (translation_table[i].newcmd & 0xff3f)){
3127                         *cmd = translation_table[i].newcmd;
3128                         if (!orig_size && _IOC_SIZE(*cmd)) {
3129                                 /* kernels 1.3.34 to 1.3.39 : */
3130                                 *size = _IOC_SIZE(*cmd); 
3131                                 DPRINT1("warning: obsolete ioctl 0x%x\n",ocmd);
3132                                 DPRINT("please recompile your program\n");
3133                                 /* these ioctls only existed
3134                                  * in six (development)
3135                                  * kernels anyways. That's why we
3136                                  * complain about these, and not about
3137                                  * the much older 0x00xx ioctl's
3138                                  */
3139                         } else {
3140                                 *size = orig_size;
3141                                 if (*size > _IOC_SIZE(*cmd)) {
3142                                         printk("ioctl not yet supported\n");
3143                                         return -EFAULT;
3144                                 }
3145                         }
3146                         return 0;
3147                 }
3148         }
3149         return -EINVAL;
3150 }
3151 
3152 static inline int xlate_0x00xx_ioctl(int *cmd, int *size)
     /*  */
3153 {
3154         int i;
3155         /* kernels <= 1.3.33 */
3156         /* we might want to start warning in 1.4.x (by then, no user
3157          * programs will have an excuse to use the old ioctls: there
3158          * will be a stable kernel supporting them :)
3159          *
3160          * when the first 1.5.x kernel will come out, this loop will
3161          * be removed as well.
3162          */
3163         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3164                 if (*cmd == translation_table[i].oldcmd) {
3165                         *size = translation_table[i].oldsize;
3166                         *cmd = translation_table[i].newcmd;
3167                         return 0;
3168                 }
3169         }
3170         return -EINVAL;
3171 }
3172 
3173 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
3174                     unsigned long param)
3175 {
3176 #define IOCTL_MODE_BIT 8
3177 #define OPEN_WRITE_BIT 16
3178 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3179 #define OUT(c,x) case c: outparam = (const char *) (x); break
3180 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3181 
3182         int i,drive,type;
3183         kdev_t device;
3184         int ret;
3185         int size;
3186         union inparam {
3187                 struct floppy_struct g; /* geometry */
3188                 struct format_descr f;
3189                 struct floppy_max_errors max_errors;
3190                 struct floppy_drive_params dp;
3191         } inparam; /* parameters coming from user space */
3192         const char *outparam; /* parameters passed back to user space */
3193 
3194         device = inode->i_rdev;
3195         switch (cmd) {
3196                 RO_IOCTLS(device,param);
3197         }
3198         type = TYPE(device);
3199         drive = DRIVE(device);
3200 
3201         /* convert the old style command into a new style command */
3202         if ((cmd & 0xff00) == 0x0200) {
3203                 ECALL(normalize_0x02xx_ioctl(&cmd, &size));
3204         } else if ((cmd & 0xff00) == 0x0000) {
3205                 ECALL(xlate_0x00xx_ioctl(&cmd, &size));
3206         } else
3207                 return -EINVAL;
3208 
3209         /* permission checks */
3210         if (((cmd & 0x80) && !suser()) ||
3211              ((cmd & 0x40) && !IOCTL_ALLOWED))
3212                 return -EPERM;
3213 
3214         /* verify writability of result, and fail early */
3215         if (_IOC_DIR(cmd) & _IOC_READ)
3216                 ECALL(verify_area(VERIFY_WRITE,(void *) param, size));
3217                 
3218         /* copyin */
3219         CLEARSTRUCT(&inparam);
3220         if (_IOC_DIR(cmd) & _IOC_WRITE)
3221                 ECALL(fd_copyin((void *)param, &inparam, size))
3222 
3223         switch (cmd) {
3224                 case FDCLRPRM:
3225                         LOCK_FDC(drive,1);
3226                         current_type[drive] = NULL;
3227                         floppy_sizes[drive] = MAX_DISK_SIZE;
3228                         UDRS->keep_data = 0;
3229                         return invalidate_drive(device);
3230                 case FDSETPRM:
3231                 case FDDEFPRM:
3232                         return set_geometry(cmd, & inparam.g,
3233                                             drive, type, device);
3234                 case FDGETPRM:
3235                         if (type)
3236                                 outparam = (char *) &floppy_type[type];
3237                         else 
3238                                 outparam = (char *) current_type[drive];
3239                         if(!outparam)
3240                                 return -ENODEV;
3241                         break;
3242 
3243                 case FDMSGON:
3244                         UDP->flags |= FTD_MSG;
3245                         return 0;
3246                 case FDMSGOFF:
3247                         UDP->flags &= ~FTD_MSG;
3248                         return 0;
3249 
3250                 case FDFMTBEG:
3251                         return 0;
3252                 case FDFMTTRK:
3253                         if (UDRS->fd_ref != 1)
3254                                 return -EBUSY;
3255                         return do_format(device, &inparam.f);
3256                 case FDFMTEND:
3257                 case FDFLUSH:
3258                         LOCK_FDC(drive,1);
3259                         return invalidate_drive(device);
3260 
3261                 case FDSETEMSGTRESH:
3262                         UDP->max_errors.reporting =
3263                                 (unsigned short) (param & 0x0f);
3264                         return 0;
3265                 OUT(FDGETMAXERRS, &UDP->max_errors);
3266                 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3267 
3268                 case FDGETDRVTYP:
3269                         outparam = drive_name(type,drive);
3270                         SUPBOUND(size,strlen(outparam)+1);
3271                         break;
3272 
3273                 IN(FDSETDRVPRM, UDP, dp);
3274                 OUT(FDGETDRVPRM, UDP);
3275 
3276                 case FDPOLLDRVSTAT:
3277                         LOCK_FDC(drive,1);
3278                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3279                         process_fd_request();
3280                         /* fall through */
3281                 OUT(FDGETDRVSTAT, UDRS);
3282 
3283                 case FDRESET:
3284                         return user_reset_fdc(drive, (int)param, 1);
3285 
3286                 OUT(FDGETFDCSTAT,UFDCS);
3287 
3288                 case FDWERRORCLR:
3289                         CLEARSTRUCT(UDRWE);
3290                         return 0;
3291                 OUT(FDWERRORGET,UDRWE);
3292 
3293                 case OLDFDRAWCMD:
3294                 case FDRAWCMD:
3295                         if (type)
3296                                 return -EINVAL;
3297                         LOCK_FDC(drive,1);
3298                         set_floppy(device);
3299                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3300                         process_fd_request();
3301                         return i;
3302 
3303                 case FDTWADDLE:
3304                         LOCK_FDC(drive,1);
3305                         twaddle();
3306                         process_fd_request();
3307                         return 0;
3308 
3309                 default:
3310                         return -EINVAL;
3311         }
3312 
3313         if (_IOC_DIR(cmd) & _IOC_READ)
3314                 return fd_copyout((void *)param, outparam, size);
3315         else
3316                 return 0;
3317 #undef IOCTL_ALLOWED
3318 #undef OUT
3319 #undef IN
3320 }
3321 
3322 static void config_types(void)
     /*  */
3323 {
3324         int first=1;
3325         int drive;
3326 
3327         /* read drive info out of physical cmos */
3328         drive=0;
3329         if (!UDP->cmos)
3330                 UDP->cmos= FLOPPY0_TYPE;
3331         drive=1;
3332         if (!UDP->cmos && FLOPPY1_TYPE)
3333                 UDP->cmos = FLOPPY1_TYPE;
3334 
3335         /* XXX */
3336         /* additional physical CMOS drive detection should go here */
3337 
3338         for (drive=0; drive < N_DRIVE; drive++){
3339                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3340                         memcpy((char *) UDP,
3341                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3342                                sizeof(struct floppy_drive_params));
3343                 if (UDP->cmos){
3344                         if (first)
3345                                 printk("Floppy drive(s): ");
3346                         else
3347                                 printk(", ");
3348                         first=0;
3349                         if (UDP->cmos > 0){
3350                                 allowed_drive_mask |= 1 << drive;
3351                                 printk("fd%d is %s", drive,
3352                                        default_drive_params[(int)UDP->cmos].name);
3353                         } else
3354                                 printk("fd%d is unknown type %d",drive,
3355                                        UDP->cmos);
3356                 }
3357         }
3358         if (!first)
3359                 printk("\n");
3360 }
3361 
3362 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
3363                        char * buf, int count)
3364 {
3365         int drive = DRIVE(inode->i_rdev);
3366 
3367         check_disk_change(inode->i_rdev);
3368         if (UTESTF(FD_DISK_CHANGED))
3369                 return -ENXIO;
3370         return block_read(inode, filp, buf, count);
3371 }
3372 
3373 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
3374                         const char * buf, int count)
3375 {
3376         int block;
3377         int ret;
3378         int drive = DRIVE(inode->i_rdev);
3379 
3380         if (!UDRS->maxblock)
3381                 UDRS->maxblock=1;/* make change detectable */
3382         check_disk_change(inode->i_rdev);
3383         if (UTESTF(FD_DISK_CHANGED))
3384                 return -ENXIO;
3385         if (!UTESTF(FD_DISK_WRITABLE))
3386                 return -EROFS;
3387         block = (filp->f_pos + count) >> 9;
3388         INFBOUND(UDRS->maxblock, block);
3389         ret= block_write(inode, filp, buf, count);
3390         return ret;
3391 }
3392 
3393 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
3394 {
3395         int drive;
3396 
3397         drive = DRIVE(inode->i_rdev);
3398 
3399         if (!filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3400                 /* if the file is mounted OR (writable now AND writable at
3401                  * open time) Linus: Does this cover all cases? */
3402                 block_fsync(inode,filp);
3403 
3404         if (UDRS->fd_ref < 0)
3405                 UDRS->fd_ref=0;
3406         else if (!UDRS->fd_ref--) {
3407                 DPRINT("floppy_release with fd_ref == 0");
3408                 UDRS->fd_ref = 0;
3409         }
3410         floppy_release_irq_and_dma();
3411 }
3412 
3413 /*
3414  * floppy_open check for aliasing (/dev/fd0 can be the same as
3415  * /dev/PS0 etc), and disallows simultaneous access to the same
3416  * drive with different device numbers.
3417  */
3418 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3419 
3420 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
3421 {
3422         int drive;
3423         int old_dev;
3424         int try;
3425         char *tmp;
3426 
3427         if (!filp) {
3428                 DPRINT("Weird, open called with filp=0\n");
3429                 return -EIO;
3430         }
3431 
3432         drive = DRIVE(inode->i_rdev);
3433         if (drive >= N_DRIVE ||
3434             !(allowed_drive_mask & (1 << drive)) ||
3435             fdc_state[FDC(drive)].version == FDC_NONE)
3436                 return -ENXIO;
3437 
3438         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3439                 return -ENXIO;
3440         old_dev = UDRS->fd_device;
3441         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3442                 return -EBUSY;
3443 
3444         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3445                 USETF(FD_DISK_CHANGED);
3446                 USETF(FD_VERIFY);
3447         }
3448 
3449         if (UDRS->fd_ref == -1 ||
3450            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3451                 return -EBUSY;
3452 
3453         if (floppy_grab_irq_and_dma())
3454                 return -EBUSY;
3455 
3456         if (filp->f_flags & O_EXCL)
3457                 UDRS->fd_ref = -1;
3458         else
3459                 UDRS->fd_ref++;
3460 
3461         if (!floppy_track_buffer){
3462                 /* if opening an ED drive, reserve a big buffer,
3463                  * else reserve a small one */
3464                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3465                         try = 64; /* Only 48 actually useful */
3466                 else
3467                         try = 32; /* Only 24 actually useful */
3468 
3469                 tmp=(char *)dma_mem_alloc(1024 * try);
3470                 if (!tmp) {
3471                         try >>= 1; /* buffer only one side */
3472                         INFBOUND(try, 16);
3473                         tmp= (char *)dma_mem_alloc(1024*try);
3474                 }
3475                 if (!tmp) {
3476                         DPRINT("Unable to allocate DMA memory\n");
3477                         RETERR(ENXIO);
3478                 }
3479                 if (floppy_track_buffer){
3480                         free_pages((unsigned long)tmp,__get_order(try*1024));
3481                 }else {
3482                         buffer_min = buffer_max = -1;
3483                         floppy_track_buffer = tmp;
3484                         max_buffer_sectors = try;
3485                 }
3486         }
3487 
3488         UDRS->fd_device = MINOR(inode->i_rdev);
3489         if (old_dev != -1 && old_dev != MINOR(inode->i_rdev)) {
3490                 if (buffer_drive == drive)
3491                         buffer_track = -1;
3492                 invalidate_buffers(MKDEV(FLOPPY_MAJOR,old_dev));
3493         }
3494 
3495         /* Allow ioctls if we have write-permissions even if read-only open */
3496         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3497                 filp->f_mode |= IOCTL_MODE_BIT;
3498         if (filp->f_mode & 2)
3499                 filp->f_mode |= OPEN_WRITE_BIT;
3500 
3501         if (UFDCS->rawcmd == 1)
3502                 UFDCS->rawcmd = 2;
3503 
3504         if (filp->f_flags & O_NDELAY)
3505                 return 0;
3506         if (filp->f_mode & 3) {
3507                 UDRS->last_checked = 0;
3508                 check_disk_change(inode->i_rdev);
3509                 if (UTESTF(FD_DISK_CHANGED))
3510                         RETERR(ENXIO);
3511         }
3512         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3513                 RETERR(EROFS);
3514         return 0;
3515 #undef RETERR
3516 }
3517 
3518 /*
3519  * Check if the disk has been changed or if a change has been faked.
3520  */
3521 static int check_floppy_change(kdev_t dev)
     /*  */
3522 {
3523         int drive = DRIVE(dev);
3524 
3525         if (MAJOR(dev) != MAJOR_NR) {
3526                 DPRINT("floppy_changed: not a floppy\n");
3527                 return 0;
3528         }
3529 
3530         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3531                 return 1;
3532 
3533         if (UDRS->last_checked + UDP->checkfreq < jiffies){
3534                 lock_fdc(drive,0);
3535                 poll_drive(0,0);
3536                 process_fd_request();
3537         }
3538 
3539         if (UTESTF(FD_DISK_CHANGED) ||
3540            UTESTF(FD_VERIFY) ||
3541            test_bit(drive, &fake_change) ||
3542            (!TYPE(dev) && !current_type[drive]))
3543                 return 1;
3544         return 0;
3545 }
3546 
3547 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3548  * the bootblock (block 0). "Autodetection" is also needed to check whether
3549  * there is a disk in the drive at all... Thus we also do it for fixed
3550  * geometry formats */
3551 static int floppy_revalidate(kdev_t dev)
     /*  */
3552 {
3553 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3554         struct buffer_head * bh;
3555         int drive=DRIVE(dev);
3556         int cf;
3557 
3558         if (UTESTF(FD_DISK_CHANGED) ||
3559            UTESTF(FD_VERIFY) ||
3560            test_bit(drive, &fake_change) ||
3561            NO_GEOM){
3562                 lock_fdc(drive,0);
3563                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3564                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)){
3565                         process_fd_request(); /*already done by another thread*/
3566                         return 0;
3567                 }
3568                 UDRS->maxblock = 0;
3569                 UDRS->maxtrack = 0;
3570                 if (buffer_drive == drive)
3571                         buffer_track = -1;
3572                 clear_bit(drive, &fake_change);
3573                 UCLEARF(FD_DISK_CHANGED);
3574                 if (cf)
3575                         UDRS->generation++;
3576                 if (NO_GEOM){
3577                         /* auto-sensing */
3578                         int size = floppy_blocksizes[MINOR(dev)];
3579                         if (!size)
3580                                 size = 1024;
3581                         if (!(bh = getblk(dev,0,size))){
3582                                 process_fd_request();
3583                                 return 1;
3584                         }
3585                         if (bh && !buffer_uptodate(bh))
3586                                 ll_rw_block(READ, 1, &bh);
3587                         process_fd_request();
3588                         wait_on_buffer(bh);
3589                         brelse(bh);
3590                         return 0;
3591                 }
3592                 if (cf)
3593                         poll_drive(0, FD_RAW_NEED_DISK);
3594                 process_fd_request();
3595         }
3596         return 0;
3597 }
3598 
3599 static struct file_operations floppy_fops = {
3600         NULL,                   /* lseek - default */
3601         floppy_read,            /* read - general block-dev read */
3602         floppy_write,           /* write - general block-dev write */
3603         NULL,                   /* readdir - bad */
3604         NULL,                   /* select */
3605         fd_ioctl,               /* ioctl */
3606         NULL,                   /* mmap */
3607         floppy_open,            /* open */
3608         floppy_release,         /* release */
3609         block_fsync,            /* fsync */
3610         NULL,                   /* fasync */
3611         check_floppy_change,    /* media_change */
3612         floppy_revalidate,      /* revalidate */
3613 };
3614 
3615 /*
3616  * Floppy Driver initialisation
3617  * =============================
3618  */
3619 
3620 /* Determine the floppy disk controller type */
3621 /* This routine was written by David C. Niemi */
3622 static char get_fdc_version(void)
     /*  */
3623 {
3624         int r;
3625 
3626         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3627         if (FDCS->reset)
3628                 return FDC_NONE;
3629         if ((r = result()) <= 0x00)
3630                 return FDC_NONE;        /* No FDC present ??? */
3631         if ((r==1) && (reply_buffer[0] == 0x80)){
3632                 printk("FDC %d is a 8272A\n",fdc);
3633                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3634         }
3635         if (r != 10) {
3636                 printk("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3637                        fdc, r);
3638                 return FDC_UNKNOWN;
3639         }
3640         output_byte(FD_VERSION);
3641         r = result();
3642         if ((r == 1) && (reply_buffer[0] == 0x80)){
3643                 printk("FDC %d is a 82072\n",fdc);
3644                 return FDC_82072;               /* 82072 doesn't know VERSION */
3645         }
3646         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3647                 printk("FDC %d init: VERSION: unexpected return of %d bytes.\n",
3648                        fdc, r);
3649                 return FDC_UNKNOWN;
3650         }
3651         output_byte(FD_UNLOCK);
3652         r = result();
3653         if ((r == 1) && (reply_buffer[0] == 0x80)){
3654                 printk("FDC %d is a pre-1991 82077\n", fdc);
3655                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3656         }
3657         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3658                 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3659                        fdc, r);
3660                 return FDC_UNKNOWN;
3661         }
3662         output_byte(FD_PARTID);
3663         r = result();
3664         if (r != 1) {
3665                 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3666                        fdc, r);
3667                 return FDC_UNKNOWN;
3668         }
3669         if (reply_buffer[0] == 0x80) {
3670                 printk("FDC %d is a post-1991 82077\n",fdc);
3671                 return FDC_82077;       /* Revised 82077AA passes all the tests */
3672         }
3673         switch (reply_buffer[0] >> 5) {
3674         case 0x0:
3675                 output_byte(FD_SAVE);
3676                 r = result();
3677                 if (r != 17) {
3678                         printk("FDC %d init: SAVE: unexpected return of %d bytes.\n",fdc,r);
3679                         return FDC_UNKNOWN;
3680                 }
3681                 if (!(reply_buffer[0] & 0x40)) {
3682                         printk("FDC %d is a 3Volt 82078SL.\n",fdc);
3683                         return FDC_82078;
3684                 }
3685                 /* Either a 82078-1 or a 82078SL running at 5Volt */
3686                 printk("FDC %d is a 82078-1.\n",fdc);
3687                 return FDC_82078_1;
3688         case 0x1:
3689                 printk("FDC %d is a 44pin 82078\n",fdc);
3690                 return FDC_82078;
3691         case 0x3:
3692                 printk("FDC %d is a National Semiconductor PC87306\n",fdc);
3693                 return FDC_87306;
3694         default:
3695                 printk("FDC %d init: Unknown 82077 variant, PARTID = %d.\n",
3696                        fdc, reply_buffer[0] >> 5);
3697                 return FDC_82077_UNKN;
3698         }
3699 } /* get_fdc_version */
3700 
3701 /* lilo configuration */
3702 
3703 /* we make the invert_dcl function global. One day, somebody might
3704  * want to centralize all thinkpad related options into one lilo option,
3705  * there are just so many thinkpad related quirks! */
3706 void floppy_invert_dcl(int *ints,int param)
     /*  */
3707 {
3708         int i;
3709 
3710         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3711                 if (param)
3712                         default_drive_params[i].params.flags |= 0x80;
3713                 else
3714                         default_drive_params[i].params.flags &= ~0x80;
3715         }
3716         DPRINT("Configuring drives for inverted dcl\n");
3717 }
3718 
3719 static void daring(int *ints,int param)
     /*  */
3720 {
3721         int i;
3722 
3723         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3724                 if (param){
3725                         default_drive_params[i].params.select_delay = 0;
3726                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3727                 } else {
3728                         default_drive_params[i].params.select_delay = 2*HZ/100;
3729                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3730                 }
3731         }
3732         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3733 }
3734 
3735 static void allow_drives(int *ints, int param)
     /*  */
3736 {
3737         allowed_drive_mask=param;
3738         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3739 }
3740 
3741 static void fdc2_adr(int *ints, int param)
     /*  */
3742 {
3743         FDC2 = param;
3744         if (param)
3745                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3746         else
3747                 DPRINT("disabling second fdc\n");
3748 }
3749 
3750 static void unex(int *ints,int param)
     /*  */
3751 {
3752         print_unex = param;
3753         DPRINT1("%sprinting messages for unexpected interrupts\n",
3754                 param ? "" : "not ");
3755 }
3756 
3757 static void set_cmos(int *ints, int dummy)
     /*  */
3758 {
3759         int current_drive=0;
3760 
3761         if (ints[0] != 2){
3762                 DPRINT("wrong number of parameter for cmos\n");
3763                 return;
3764         }
3765         current_drive = ints[1];
3766         if (current_drive < 0 || current_drive >= 8){
3767                 DPRINT("bad drive for set_cmos\n");
3768                 return;
3769         }
3770         if (current_drive >= 4 && !FDC2)
3771                 fdc2_adr(0, 0x370);
3772         if (ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3773                 DPRINT1("bad cmos code %d\n", ints[2]);
3774                 return;
3775         }
3776         DP->cmos = ints[2];
3777         DPRINT1("setting cmos code to %d\n", ints[2]);
3778 }
3779 
3780 static struct param_table {
3781         const char *name;
3782         void (*fn)(int *ints, int param);
3783         int def_param;
3784 } config_params[]={
3785         { "allowed_drive_mask", allow_drives, 0xff },
3786         { "all_drives", allow_drives, 0xff },
3787         { "asus_pci", allow_drives, 0x33 },
3788 
3789         { "daring", daring, 1},
3790 
3791         { "two_fdc", fdc2_adr, 0x370 },
3792         { "one_fdc", fdc2_adr, 0 },
3793 
3794         { "thinkpad", floppy_invert_dcl, 1 },
3795 
3796         { "cmos", set_cmos, 0 },
3797 
3798         { "unexpected_interrupts", unex, 1 },
3799         { "no_unexpected_interrupts", unex, 0 },
3800         { "L40SX", unex, 0 } };
3801 
3802 #define FLOPPY_SETUP
3803 void floppy_setup(char *str, int *ints)
     /*  */
3804 {
3805         int i;
3806         int param;
3807         if (str)
3808                 for (i=0; i< ARRAY_SIZE(config_params); i++){
3809                         if (strcmp(str,config_params[i].name) == 0){
3810                                 if (ints[0])
3811                                         param = ints[1];
3812                                 else
3813                                         param = config_params[i].def_param;
3814                                 config_params[i].fn(ints,param);
3815                                 return;
3816                         }
3817                 }
3818         if (str) {
3819                 DPRINT1("unknown floppy option [%s]\n", str);
3820                 
3821                 DPRINT("allowed options are:");
3822                 for (i=0; i< ARRAY_SIZE(config_params); i++)
3823                         printk(" %s",config_params[i].name);
3824                 printk("\n");
3825         } else
3826                 DPRINT("botched floppy option\n");
3827         DPRINT("Read linux/drivers/block/README.fd\n");
3828 }
3829 
3830 int floppy_init(void)
     /*  */
3831 {
3832         int i,unit,drive;
3833         int have_no_fdc= -EIO;
3834 
3835         raw_cmd = 0;
3836 
3837         sti();
3838 
3839         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3840                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3841                 return -EBUSY;
3842         }
3843 
3844         for (i=0; i<256; i++)
3845                 if (TYPE(i))
3846                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3847                 else
3848                         floppy_sizes[i] = MAX_DISK_SIZE;
3849 
3850         blk_size[MAJOR_NR] = floppy_sizes;
3851         blksize_size[MAJOR_NR] = floppy_blocksizes;
3852         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3853         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3854         config_types();
3855 
3856         for (i = 0; i < N_FDC; i++) {
3857                 fdc = i;
3858                 CLEARSTRUCT(FDCS);
3859                 FDCS->dtr = -1;
3860                 FDCS->dor = 0x4;
3861         }
3862 
3863         fdc_state[0].address = FDC1;
3864 #if N_FDC > 1
3865         fdc_state[1].address = FDC2;
3866 #endif
3867 
3868         if (floppy_grab_irq_and_dma()){
3869                 unregister_blkdev(MAJOR_NR,"fd");
3870                 return -EBUSY;
3871         }
3872 
3873         /* initialise drive state */
3874         for (drive = 0; drive < N_DRIVE; drive++) {
3875                 CLEARSTRUCT(UDRS);
3876                 CLEARSTRUCT(UDRWE);
3877                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3878                 UDRS->fd_device = -1;
3879                 floppy_track_buffer = NULL;
3880                 max_buffer_sectors = 0;
3881         }
3882 
3883         for (i = 0; i < N_FDC; i++) {
3884                 fdc = i;
3885                 FDCS->driver_version = FD_DRIVER_VERSION;
3886                 for (unit=0; unit<4; unit++)
3887                         FDCS->track[unit] = 0;
3888                 if (FDCS->address == -1)
3889                         continue;
3890                 FDCS->rawcmd = 2;
3891                 if (user_reset_fdc(-1,FD_RESET_ALWAYS,0)){
3892                         FDCS->address = -1;
3893                         continue;
3894                 }
3895                 /* Try to determine the floppy controller type */
3896                 FDCS->version = get_fdc_version();
3897                 if (FDCS->version == FDC_NONE){
3898                         FDCS->address = -1;
3899                         continue;
3900                 }
3901 
3902                 request_region(FDCS->address, 6, "floppy");
3903                 request_region(FDCS->address+7, 1, "floppy DIR");
3904                 /* address + 6 is reserved, and may be taken by IDE.
3905                  * Unfortunately, Adaptec doesn't know this :-(, */
3906 
3907                 have_no_fdc = 0;
3908                 /* Not all FDCs seem to be able to handle the version command
3909                  * properly, so force a reset for the standard FDC clones,
3910                  * to avoid interrupt garbage.
3911                  */
3912                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3913                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3914         }
3915         fdc=0;
3916         del_timer(&fd_timeout);
3917         current_drive = 0;
3918         floppy_release_irq_and_dma();
3919         initialising=0;
3920         if (have_no_fdc) {
3921                 DPRINT("no floppy controllers found\n");
3922                 unregister_blkdev(MAJOR_NR,"fd");
3923         } else
3924                 virtual_dma_init();
3925         return have_no_fdc;
3926 }
3927 
3928 static int floppy_grab_irq_and_dma(void)
     /*  */
3929 {
3930         int i;
3931         cli();
3932         if (usage_count++){
3933                 sti();
3934                 return 0;
3935         }
3936         sti();
3937         MOD_INC_USE_COUNT;
3938         for (i=0; i< N_FDC; i++){
3939                 if (FDCS->address != -1){
3940                         fdc = i;
3941                         reset_fdc_info(1);
3942                         fd_outb(FDCS->dor, FD_DOR);
3943                 }
3944         }
3945         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3946 
3947         if (fd_request_irq()) {
3948                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3949                         FLOPPY_IRQ);
3950                 return -1;
3951         }
3952         if (fd_request_dma()) {
3953                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3954                         FLOPPY_DMA);
3955                 fd_free_irq();
3956                 return -1;
3957         }
3958         for (fdc = 0; fdc < N_FDC; fdc++)
3959                 if (FDCS->address != -1)
3960                         fd_outb(FDCS->dor, FD_DOR);
3961         fdc = 0;
3962         fd_enable_irq();
3963         return 0;
3964 }
3965 
3966 static void floppy_release_irq_and_dma(void)
     /*  */
3967 {
3968 #ifdef FLOPPY_SANITY_CHECK
3969         int drive;
3970 #endif
3971         long tmpsize;
3972         void *tmpaddr;
3973 
3974         cli();
3975         if (--usage_count){
3976                 sti();
3977                 return;
3978         }
3979         sti();
3980         MOD_DEC_USE_COUNT;
3981         fd_disable_dma();
3982         fd_free_dma();
3983         fd_disable_irq();
3984         fd_free_irq();
3985 
3986         set_dor(0, ~0, 8);
3987 #if N_FDC > 1
3988         set_dor(1, ~8, 0);
3989 #endif
3990         floppy_enable_hlt();
3991 
3992         if (floppy_track_buffer && max_buffer_sectors) {
3993                 tmpsize = max_buffer_sectors*1024;
3994                 tmpaddr = (void *)floppy_track_buffer;
3995                 floppy_track_buffer = 0;
3996                 max_buffer_sectors = 0;
3997                 buffer_min = buffer_max = -1;
3998                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
3999         }
4000 
4001 #ifdef FLOPPY_SANITY_CHECK
4002         for (drive=0; drive < N_FDC * 4; drive++)
4003                 if (motor_off_timer[drive].next)
4004                         printk("motor off timer %d still active\n", drive);
4005 
4006         if (fd_timeout.next)
4007                 printk("floppy timer still active:%s\n", timeout_message);
4008         if (fd_timer.next)
4009                 printk("auxiliary floppy timer still active\n");
4010         if (floppy_tq.sync)
4011                 printk("task queue still active\n");
4012 #endif
4013 }
4014 
4015 
4016 #ifdef MODULE
4017 
4018 extern char *get_options(char *str, int *ints);
4019 
4020 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /*  */
4021 {
4022         int i;
4023         char c;
4024         int j;
4025         int match;
4026         char buffer[100];
4027         int ints[11];
4028         int length = strlen(pattern)+1;
4029 
4030         match=0;
4031         j=1;
4032 
4033         for (i=current->mm->env_start; i< current->mm->env_end; i ++){
4034                 c= get_fs_byte(i);
4035                 if (match){
4036                         if (j==99)
4037                                 c='\0';
4038                         buffer[j] = c;
4039                         if (!c || c == ' ' || c == '\t'){
4040                                 if (j){
4041                                         buffer[j] = '\0';
4042                                         setup(get_options(buffer,ints),ints);
4043                                 }
4044                                 j=0;
4045                         } else
4046                                 j++;
4047                         if (!c)
4048                                 break;
4049                         continue;
4050                 }
4051                 if ((!j && !c) || (j && c == pattern[j-1]))
4052                         j++;
4053                 else
4054                         j=0;
4055                 if (j==length){
4056                         match=1;
4057                         j=0;
4058                 }
4059         }
4060 }
4061 
4062 
4063 #ifdef __cplusplus
4064 extern "C" {
4065 #endif
4066 int init_module(void)
     /*  */
4067 {
4068         printk("inserting floppy driver for %s\n", kernel_version);
4069                 
4070         mod_setup("floppy=", floppy_setup);
4071                 
4072         return floppy_init();
4073 }
4074 
4075 void cleanup_module(void)
     /*  */
4076 {
4077         int fdc;
4078                 
4079         for (fdc=0; fdc<2; fdc++)
4080                 if (FDCS->address != -1){
4081                         release_region(FDCS->address, 6);
4082                         release_region(FDCS->address+7, 1);
4083         }
4084                 
4085         unregister_blkdev(MAJOR_NR, "fd");
4086 
4087         blk_dev[MAJOR_NR].request_fn = 0;
4088 }
4089 
4090 #ifdef __cplusplus
4091 }
4092 #endif
4093 
4094 #endif