root/drivers/block/floppy.c

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DEFINITIONS

This source file includes following 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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) {
     /* [previous][next][first][last][top][bottom][index][help] */
 205         return  (MINOR(x)>>2) & 0x1f;
 206 }
 207 static inline int DRIVE(kdev_t x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 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 10
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 523 {
 524 #ifdef DEBUGT
 525         debugtimer = jiffies;
 526 #endif
 527 }
 528 
 529 static inline void debugt(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 697 {
 698         return ((dor  & (0x10 << unit)) && (dor &3) == unit);
 699 }
 700 
 701 static int set_dor(int fdc, char mask, char data)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
 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)
     /* [previous][next][first][last][top][bottom][index][help] */
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)
     /* [previous][next][first][last][top][bottom][index][help] */
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)
     /* [previous][next][first][last][top][bottom][index][help] */
1089 {
1090         unsigned char perp_mode;
1091 
1092         if (!floppy)
1093                 return;
1094         if (floppy->rate & 0x40){
1095                 switch(raw_cmd->rate){
1096                         case 0:
1097                                 perp_mode=2;
1098                                 break;
1099                         case 3:
1100                                 perp_mode=3;
1101                                 break;
1102                         default:
1103                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1104                                 cont->done(0);
1105                                 FDCS->reset = 1; /* convenient way to return to
1106                                                   * redo without to much hassle (deep
1107                                                   * stack et al. */
1108                                 return;
1109                 }
1110         } else
1111                 perp_mode = 0;
1112 
1113         if (FDCS->perp_mode == perp_mode)
1114                 return;
1115         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1116                 output_byte(FD_PERPENDICULAR);
1117                 output_byte(perp_mode);
1118                 FDCS->perp_mode = perp_mode;
1119         } else if (perp_mode) {
1120                 DPRINT("perpendicular mode not supported by this FDC.\n");
1121         }
1122 } /* perpendicular_mode */
1123 
1124 #define NOMINAL_DTR 500
1125 
1126 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1127  * head load time, and DMA disable flag to values needed by floppy.
1128  *
1129  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1130  * to account for the data rate-based scaling done by the 82072 and 82077
1131  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1132  * 8272a).
1133  *
1134  * Note that changing the data transfer rate has a (probably deleterious)
1135  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1136  * fdc_specify is called again after each data transfer rate
1137  * change.
1138  *
1139  * srt: 1000 to 16000 in microseconds
1140  * hut: 16 to 240 milliseconds
1141  * hlt: 2 to 254 milliseconds
1142  *
1143  * These values are rounded up to the next highest available delay time.
1144  */
1145 static void fdc_specify(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1146 {
1147         unsigned char spec1, spec2;
1148         int srt, hlt, hut;
1149         unsigned long dtr = NOMINAL_DTR;
1150         unsigned long scale_dtr = NOMINAL_DTR;
1151         int hlt_max_code = 0x7f;
1152         int hut_max_code = 0xf;
1153 
1154         if (FDCS->need_configure && FDCS->has_fifo) {
1155                 if (FDCS->reset)
1156                         return;
1157                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1158                 /* TODO: lock this in via LOCK during initialization */
1159                 output_byte(FD_CONFIGURE);
1160                 output_byte(0);
1161                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1162                 output_byte(0);         /* precompensation from track 0 upwards */
1163                 if (FDCS->reset){
1164                         FDCS->has_fifo=0;
1165                         return;
1166                 }
1167                 FDCS->need_configure = 0;
1168                 /*DPRINT("FIFO enabled\n");*/
1169         }
1170 
1171         switch (raw_cmd->rate & 0x03) {
1172                 case 3:
1173                         dtr = 1000;
1174                         break;
1175                 case 1:
1176                         dtr = 300;
1177                         break;
1178                 case 2:
1179                         dtr = 250;
1180                         break;
1181         }
1182 
1183         if (FDCS->version >= FDC_82072) {
1184                 scale_dtr = dtr;
1185                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1186                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1187         }
1188 
1189         /* Convert step rate from microseconds to milliseconds and 4 bits */
1190         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1191         SUPBOUND(srt, 0xf);
1192         INFBOUND(srt, 0);
1193 
1194         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1195         if (hlt < 0x01)
1196                 hlt = 0x01;
1197         else if (hlt > 0x7f)
1198                 hlt = hlt_max_code;
1199 
1200         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1201         if (hut < 0x1)
1202                 hut = 0x1;
1203         else if (hut > 0xf)
1204                 hut = hut_max_code;
1205 
1206         spec1 = (srt << 4) | hut;
1207         spec2 = (hlt << 1);
1208 
1209         /* If these parameters did not change, just return with success */
1210         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1211                 /* Go ahead and set spec1 and spec2 */
1212                 output_byte(FD_SPECIFY);
1213                 output_byte(FDCS->spec1 = spec1);
1214                 output_byte(FDCS->spec2 = spec2);
1215         }
1216 } /* fdc_specify */
1217 
1218 /* Set the FDC's data transfer rate on behalf of the specified drive.
1219  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1220  * of the specify command (i.e. using the fdc_specify function).
1221  */
1222 static int fdc_dtr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1223 {
1224         /* If data rate not already set to desired value, set it. */
1225         if (raw_cmd->rate == FDCS->dtr)
1226                 return 0;
1227 
1228         /* Set dtr */
1229         fd_outb(raw_cmd->rate, FD_DCR);
1230 
1231         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1232          * need a stabilization period of several milliseconds to be
1233          * enforced after data rate changes before R/W operations.
1234          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1235          */
1236         FDCS->dtr = raw_cmd->rate;
1237         return(wait_for_completion(jiffies+2*HZ/100,
1238                                    (timeout_fn) floppy_ready));
1239 } /* fdc_dtr */
1240 
1241 static void tell_sector(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1242 {
1243         printk(": track %d, head %d, sector %d, size %d",
1244                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1245 } /* tell_sector */
1246 
1247 
1248 /*
1249  * Ok, this error interpreting routine is called after a
1250  * DMA read/write has succeeded
1251  * or failed, so we check the results, and copy any buffers.
1252  * hhb: Added better error reporting.
1253  * ak: Made this into a separate routine.
1254  */
1255 static int interpret_errors(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1256 {
1257         char bad;
1258 
1259         if (inr!=7) {
1260                 DPRINT("-- FDC reply error");
1261                 FDCS->reset = 1;
1262                 return 1;
1263         }
1264 
1265         /* check IC to find cause of interrupt */
1266         switch (ST0 & ST0_INTR) {
1267                 case 0x40:      /* error occurred during command execution */
1268                         bad = 1;
1269                         if (ST1 & ST1_WP) {
1270                                 DPRINT("Drive is write protected\n");
1271                                 CLEARF(FD_DISK_WRITABLE);
1272                                 cont->done(0);
1273                                 bad = 2;
1274                         } else if (ST1 & ST1_ND) {
1275                                 SETF(FD_NEED_TWADDLE);
1276                         } else if (ST1 & ST1_OR) {
1277                                 if (DP->flags & FTD_MSG)
1278                                         DPRINT("Over/Underrun - retrying\n");
1279                                 bad = 0;
1280                         }else if (*errors >= DP->max_errors.reporting){
1281                                 DPRINT("");
1282                                 if (ST0 & ST0_ECE) {
1283                                         printk("Recalibrate failed!");
1284                                 } else if (ST2 & ST2_CRC) {
1285                                         printk("data CRC error");
1286                                         tell_sector();
1287                                 } else if (ST1 & ST1_CRC) {
1288                                         printk("CRC error");
1289                                         tell_sector();
1290                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1291                                         if (!probing) {
1292                                                 printk("sector not found");
1293                                                 tell_sector();
1294                                         } else
1295                                                 printk("probe failed...");
1296                                 } else if (ST2 & ST2_WC) {      /* seek error */
1297                                         printk("wrong cylinder");
1298                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1299                                         printk("bad cylinder");
1300                                 } else {
1301                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1302                                         tell_sector();
1303                                 }
1304                                 printk("\n");
1305 
1306                         }
1307                         if (ST2 & ST2_WC || ST2 & ST2_BC)
1308                                 /* wrong cylinder => recal */
1309                                 DRS->track = NEED_2_RECAL;
1310                         return bad;
1311                 case 0x80: /* invalid command given */
1312                         DPRINT("Invalid FDC command given!\n");
1313                         cont->done(0);
1314                         return 2;
1315                 case 0xc0:
1316                         DPRINT("Abnormal termination caused by polling\n");
1317                         cont->error();
1318                         return 2;
1319                 default: /* (0) Normal command termination */
1320                         return 0;
1321         }
1322 }
1323 
1324 /*
1325  * This routine is called when everything should be correctly set up
1326  * for the transfer (ie floppy motor is on, the correct floppy is
1327  * selected, and the head is sitting on the right track).
1328  */
1329 static void setup_rw_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1330 {
1331         int i,ready_date,r, flags,dflags;
1332         timeout_fn function;
1333 
1334         flags = raw_cmd->flags;
1335         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1336                 flags |= FD_RAW_INTR;
1337 
1338         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1339                 ready_date = DRS->spinup_date + DP->spinup;
1340                 /* If spinup will take a long time, rerun scandrives
1341                  * again just before spinup completion. Beware that
1342                  * after scandrives, we must again wait for selection.
1343                  */
1344                 if (ready_date > jiffies + DP->select_delay){
1345                         ready_date -= DP->select_delay;
1346                         function = (timeout_fn) floppy_start;
1347                 } else
1348                         function = (timeout_fn) setup_rw_floppy;
1349 
1350                 /* wait until the floppy is spinning fast enough */
1351                 if (wait_for_completion(ready_date,function))
1352                         return;
1353         }
1354         dflags = DRS->flags;
1355 
1356         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1357                 setup_DMA();
1358 
1359         if (flags & FD_RAW_INTR)
1360                 SET_INTR(main_command_interrupt);
1361 
1362         r=0;
1363         for (i=0; i< raw_cmd->cmd_count; i++)
1364                 r|=output_byte(raw_cmd->cmd[i]);
1365 
1366 #ifdef DEBUGT
1367         debugt("rw_command: ");
1368 #endif
1369         if (r){
1370                 reset_fdc();
1371                 return;
1372         }
1373 
1374         if (!(flags & FD_RAW_INTR)){
1375                 inr = result();
1376                 cont->interrupt();
1377         } else if (flags & FD_RAW_NEED_DISK)
1378                 fd_watchdog();
1379 }
1380 
1381 static int blind_seek;
1382 
1383 /*
1384  * This is the routine called after every seek (or recalibrate) interrupt
1385  * from the floppy controller.
1386  */
1387 static void seek_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1388 {
1389 #ifdef DEBUGT
1390         debugt("seek interrupt:");
1391 #endif
1392         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1393                 DPRINT("seek failed\n");
1394                 DRS->track = NEED_2_RECAL;
1395                 cont->error();
1396                 cont->redo();
1397                 return;
1398         }
1399         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1400 #ifdef DCL_DEBUG
1401                 if (DP->flags & FD_DEBUG){
1402                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1403                         DPRINT1("jiffies=%ld\n", jiffies);
1404                 }
1405 #endif
1406                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1407                 DRS->select_date = jiffies;
1408         }
1409         DRS->track = ST1;
1410         floppy_ready();
1411 }
1412 
1413 static void check_wp(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1414 {
1415         if (TESTF(FD_VERIFY)) {
1416                 /* check write protection */
1417                 output_byte(FD_GETSTATUS);
1418                 output_byte(UNIT(current_drive));
1419                 if (result() != 1){
1420                         FDCS->reset = 1;
1421                         return;
1422                 }
1423                 CLEARF(FD_VERIFY);
1424                 CLEARF(FD_NEED_TWADDLE);
1425 #ifdef DCL_DEBUG
1426                 if (DP->flags & FD_DEBUG){
1427                         DPRINT("checking whether disk is write protected\n");
1428                         DPRINT1("wp=%x\n",ST3 & 0x40);
1429                 }
1430 #endif
1431                 if (!(ST3  & 0x40))
1432                         SETF(FD_DISK_WRITABLE);
1433                 else
1434                         CLEARF(FD_DISK_WRITABLE);
1435         }
1436 }
1437 
1438 static void seek_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1439 {
1440         int track;
1441 
1442         blind_seek=0;
1443 
1444 #ifdef DCL_DEBUG
1445         if (DP->flags & FD_DEBUG){
1446                 DPRINT("calling disk change from seek\n");
1447         }
1448 #endif
1449 
1450         if (!TESTF(FD_DISK_NEWCHANGE) &&
1451             disk_change(current_drive) &&
1452             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1453                 /* the media changed flag should be cleared after the seek.
1454                  * If it isn't, this means that there is really no disk in
1455                  * the drive.
1456                  */
1457                 SETF(FD_DISK_CHANGED);
1458                 cont->done(0);
1459                 cont->redo();
1460                 return;
1461         }
1462         if (DRS->track <= NEED_1_RECAL){
1463                 recalibrate_floppy();
1464                 return;
1465         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1466                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1467                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1468                 /* we seek to clear the media-changed condition. Does anybody
1469                  * know a more elegant way, which works on all drives? */
1470                 if (raw_cmd->track)
1471                         track = raw_cmd->track - 1;
1472                 else {
1473                         if (DP->flags & FD_SILENT_DCL_CLEAR){
1474                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1475                                 blind_seek = 1;
1476                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1477                         }
1478                         track = 1;
1479                 }
1480         } else {
1481                 check_wp();
1482                 if (raw_cmd->track != DRS->track &&
1483                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1484                         track = raw_cmd->track;
1485                 else {
1486                         setup_rw_floppy();
1487                         return;
1488                 }
1489         }
1490 
1491         SET_INTR(seek_interrupt);
1492         output_byte(FD_SEEK);
1493         output_byte(UNIT(current_drive));
1494         LAST_OUT(track);
1495 #ifdef DEBUGT
1496         debugt("seek command:");
1497 #endif
1498 }
1499 
1500 static void recal_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1501 {
1502 #ifdef DEBUGT
1503         debugt("recal interrupt:");
1504 #endif
1505         if (inr !=2)
1506                 FDCS->reset = 1;
1507         else if (ST0 & ST0_ECE) {
1508                 switch(DRS->track){
1509                         case NEED_1_RECAL:
1510 #ifdef DEBUGT
1511                                 debugt("recal interrupt need 1 recal:");
1512 #endif
1513                                 /* after a second recalibrate, we still haven't
1514                                  * reached track 0. Probably no drive. Raise an
1515                                  * error, as failing immediately might upset
1516                                  * computers possessed by the Devil :-) */
1517                                 cont->error();
1518                                 cont->redo();
1519                                 return;
1520                         case NEED_2_RECAL:
1521 #ifdef DEBUGT
1522                                 debugt("recal interrupt need 2 recal:");
1523 #endif
1524                                 /* If we already did a recalibrate,
1525                                  * and we are not at track 0, this
1526                                  * means we have moved. (The only way
1527                                  * not to move at recalibration is to
1528                                  * be already at track 0.) Clear the
1529                                  * new change flag */
1530 #ifdef DCL_DEBUG
1531                                 if (DP->flags & FD_DEBUG){
1532                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1533                                 }
1534 #endif
1535 
1536                                 CLEARF(FD_DISK_NEWCHANGE);
1537                                 DRS->select_date = jiffies;
1538                                 /* fall through */
1539                         default:
1540 #ifdef DEBUGT
1541                                 debugt("recal interrupt default:");
1542 #endif
1543                                 /* Recalibrate moves the head by at
1544                                  * most 80 steps. If after one
1545                                  * recalibrate we don't have reached
1546                                  * track 0, this might mean that we
1547                                  * started beyond track 80.  Try
1548                                  * again.  */
1549                                 DRS->track = NEED_1_RECAL;
1550                                 break;
1551                 }
1552         } else
1553                 DRS->track = ST1;
1554         floppy_ready();
1555 }
1556 
1557 /*
1558  * Unexpected interrupt - Print as much debugging info as we can...
1559  * All bets are off...
1560  */
1561 static void unexpected_floppy_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1562 {
1563         int i;
1564         if (initialising)
1565                 return;
1566         if (print_unex){
1567                 DPRINT("unexpected interrupt\n");
1568                 if (inr >= 0)
1569                         for (i=0; i<inr; i++)
1570                                 printk("%d %x\n", i, reply_buffer[i]);
1571         }
1572         while(1){
1573                 output_byte(FD_SENSEI);
1574                 inr=result();
1575                 if (inr != 2)
1576                         break;
1577                 if (print_unex){
1578                         printk("sensei\n");
1579                         for (i=0; i<inr; i++)
1580                                 printk("%d %x\n", i, reply_buffer[i]);
1581                 }
1582         }
1583         FDCS->reset = 1;
1584 }
1585 
1586 static struct tq_struct floppy_tq =
1587 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1588 
1589 /* interrupt handler */
1590 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
1591 {
1592         void (*handler)(void) = DEVICE_INTR;
1593 
1594         lasthandler = handler;
1595         interruptjiffies = jiffies;
1596 
1597         floppy_enable_hlt();
1598         CLEAR_INTR;
1599         if (fdc >= N_FDC || FDCS->address == -1){
1600                 /* we don't even know which FDC is the culprit */
1601                 printk("DOR0=%x\n", fdc_state[0].dor);
1602                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1603                 printk("handler=%p\n", handler);
1604                 is_alive("bizarre fdc");
1605                 return;
1606         }
1607         inr = result();
1608         if (!handler){
1609                 unexpected_floppy_interrupt();
1610                 is_alive("unexpected");
1611                 return;
1612         }
1613         if (inr == 0){
1614                 do {
1615                         output_byte(FD_SENSEI);
1616                         inr = result();
1617                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1618         }
1619         floppy_tq.routine = (void *)(void *) handler;
1620         queue_task_irq(&floppy_tq, &tq_timer);
1621         is_alive("normal interrupt end");
1622 }
1623 
1624 static void recalibrate_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1625 {
1626 #ifdef DEBUGT
1627         debugt("recalibrate floppy:");
1628 #endif
1629         SET_INTR(recal_interrupt);
1630         output_byte(FD_RECALIBRATE);
1631         LAST_OUT(UNIT(current_drive));
1632 }
1633 
1634 /*
1635  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1636  */
1637 static void reset_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1638 {
1639 #ifdef DEBUGT
1640         debugt("reset interrupt:");
1641 #endif
1642         /* fdc_specify();          reprogram fdc */
1643         result();               /* get the status ready for set_fdc */
1644         if (FDCS->reset) {
1645                 printk("reset set in interrupt, calling %p\n", cont->error);
1646                 cont->error(); /* a reset just after a reset. BAD! */
1647         }
1648         cont->redo();
1649 }
1650 
1651 /*
1652  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1653  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1654  */
1655 static void reset_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1656 {
1657         SET_INTR(reset_interrupt);
1658         FDCS->reset = 0;
1659         reset_fdc_info(0);
1660         if (FDCS->version >= FDC_82077)
1661                 fd_outb(0x80 | (FDCS->dtr &3), FD_STATUS);
1662         else {
1663                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1664                 udelay(FD_RESET_DELAY);
1665                 outb(FDCS->dor, FD_DOR);
1666         }
1667 }
1668 
1669 static void empty(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1670 {
1671 }
1672 
1673 void show_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1674 {
1675         int i;
1676 
1677         printk("\n");
1678         printk("floppy driver state\n");
1679         printk("-------------------\n");
1680         printk("now=%ld last interrupt=%d last called handler=%p\n",
1681                jiffies, interruptjiffies, lasthandler);
1682 
1683 
1684 #ifdef FLOPPY_SANITY_CHECK
1685         printk("timeout_message=%s\n", timeout_message);
1686         printk("last output bytes:\n");
1687         for (i=0; i < OLOGSIZE; i++)
1688                 printk("%2x %2x %ld\n",
1689                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1690                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1691                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1692         printk("last result at %d\n", resultjiffies);
1693         printk("last redo_fd_request at %d\n", lastredo);
1694         for (i=0; i<resultsize; i++){
1695                 printk("%2x ", reply_buffer[i]);
1696         }
1697         printk("\n");
1698 #endif
1699 
1700         printk("status=%x\n", fd_inb(FD_STATUS));
1701         printk("fdc_busy=%d\n", fdc_busy);
1702         if (DEVICE_INTR)
1703                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1704         if (floppy_tq.sync)
1705                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1706         if (fd_timer.prev)
1707                 printk("fd_timer.function=%p\n", fd_timer.function);
1708         if (fd_timeout.prev){
1709                 printk("timer_table=%p\n",fd_timeout.function);
1710                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1711                 printk("now=%ld\n",jiffies);
1712         }
1713         printk("cont=%p\n", cont);
1714         printk("CURRENT=%p\n", CURRENT);
1715         printk("command_status=%d\n", command_status);
1716         printk("\n");
1717 }
1718 
1719 static void floppy_shutdown(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1720 {
1721         if (!initialising)
1722                 show_floppy();
1723         CLEAR_INTR;
1724         floppy_tq.routine = (void *)(void *) empty;
1725         del_timer(&fd_timer);
1726         sti();
1727 
1728         floppy_enable_hlt();
1729         fd_disable_dma();
1730         /* avoid dma going to a random drive after shutdown */
1731 
1732         if (!initialising)
1733                 DPRINT("floppy timeout\n");
1734         FDCS->reset = 1;
1735         if (cont){
1736                 cont->done(0);
1737                 cont->redo(); /* this will recall reset when needed */
1738         } else {
1739                 printk("no cont in shutdown!\n");
1740                 process_fd_request();
1741         }
1742         is_alive("floppy shutdown");
1743 }
1744 /*typedef void (*timeout_fn)(unsigned long);*/
1745 
1746 /* start motor, check media-changed condition and write protection */
1747 static int start_motor(void (*function)(void) )
     /* [previous][next][first][last][top][bottom][index][help] */
1748 {
1749         int mask, data;
1750 
1751         mask = 0xfc;
1752         data = UNIT(current_drive);
1753         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1754                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))){
1755                         set_debugt();
1756                         /* no read since this drive is running */
1757                         DRS->first_read_date = 0;
1758                         /* note motor start time if motor is not yet running */
1759                         DRS->spinup_date = jiffies;
1760                         data |= (0x10 << UNIT(current_drive));
1761                 }
1762         } else
1763                 if (FDCS->dor & (0x10 << UNIT(current_drive)))
1764                         mask &= ~(0x10 << UNIT(current_drive));
1765 
1766         /* starts motor and selects floppy */
1767         del_timer(motor_off_timer + current_drive);
1768         set_dor(fdc, mask, data);
1769 
1770         /* wait_for_completion also schedules reset if needed. */
1771         return(wait_for_completion(DRS->select_date+DP->select_delay,
1772                                    (timeout_fn) function));
1773 }
1774 
1775 static void floppy_ready(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1776 {
1777         CHECK_RESET;
1778         if (start_motor(floppy_ready)) return;
1779         if (fdc_dtr()) return;
1780 
1781 #ifdef DCL_DEBUG
1782         if (DP->flags & FD_DEBUG){
1783                 DPRINT("calling disk change from floppy_ready\n");
1784         }
1785 #endif
1786 
1787         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1788            disk_change(current_drive) &&
1789            !DP->select_delay)
1790                 twaddle(); /* this clears the dcl on certain drive/controller
1791                             * combinations */
1792 
1793         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1794                 perpendicular_mode();
1795                 fdc_specify(); /* must be done here because of hut, hlt ... */
1796                 seek_floppy();
1797         } else
1798                 setup_rw_floppy();
1799 }
1800 
1801 static void floppy_start(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1802 {
1803         reschedule_timeout(CURRENTD, "floppy start", 0);
1804 
1805         scandrives();
1806 #ifdef DCL_DEBUG
1807         if (DP->flags & FD_DEBUG){
1808                 DPRINT("setting NEWCHANGE in floppy_start\n");
1809         }
1810 #endif
1811         SETF(FD_DISK_NEWCHANGE);
1812         floppy_ready();
1813 }
1814 
1815 /*
1816  * ========================================================================
1817  * here ends the bottom half. Exported routines are:
1818  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1819  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1820  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1821  * and set_dor.
1822  * ========================================================================
1823  */
1824 /*
1825  * General purpose continuations.
1826  * ==============================
1827  */
1828 
1829 static void do_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1830 {
1831         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1832         cont = 0;
1833         command_status += 2;
1834         wake_up(&command_done);
1835 }
1836 
1837 static struct cont_t wakeup_cont={
1838         empty,
1839         do_wakeup,
1840         empty,
1841         (done_f)empty
1842 };
1843 
1844 static int wait_til_done(void (*handler)(void), int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
1845 {
1846         int ret;
1847 
1848         floppy_tq.routine = (void *)(void *) handler;
1849         queue_task(&floppy_tq, &tq_timer);
1850 
1851         cli();
1852         while(command_status < 2 && NO_SIGNAL){
1853                 is_alive("wait_til_done");
1854                 if (interruptible)
1855                         interruptible_sleep_on(&command_done);
1856                 else
1857                         sleep_on(&command_done);
1858         }
1859         if (command_status < 2){
1860                 floppy_shutdown();
1861                 sti();
1862                 process_fd_request();
1863                 return -EINTR;
1864         }
1865         sti();
1866 
1867         if (FDCS->reset)
1868                 command_status = FD_COMMAND_ERROR;
1869         if (command_status == FD_COMMAND_OKAY)
1870                 ret=0;
1871         else
1872                 ret=-EIO;
1873         command_status = FD_COMMAND_NONE;
1874         return ret;
1875 }
1876 
1877 static void generic_done(int result)
     /* [previous][next][first][last][top][bottom][index][help] */
1878 {
1879         command_status = result;
1880         cont = &wakeup_cont;
1881 }
1882 
1883 static void generic_success(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1884 {
1885         cont->done(1);
1886 }
1887 
1888 static void generic_failure(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1889 {
1890         cont->done(0);
1891 }
1892 
1893 static void success_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1894 {
1895         generic_success();
1896         cont->redo();
1897 }
1898 
1899 
1900 /*
1901  * formatting and rw support.
1902  * ==========================
1903  */
1904 
1905 static int next_valid_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1906 {
1907         int probed_format;
1908 
1909         probed_format = DRS->probed_format;
1910         while(1){
1911                 if (probed_format >= 8 ||
1912                      !DP->autodetect[probed_format]){
1913                         DRS->probed_format = 0;
1914                         return 1;
1915                 }
1916                 if (floppy_type[DP->autodetect[probed_format]].sect){
1917                         DRS->probed_format = probed_format;
1918                         return 0;
1919                 }
1920                 probed_format++;
1921         }
1922 }
1923 
1924 static void bad_flp_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1925 {
1926         if (probing){
1927                 DRS->probed_format++;
1928                 if (!next_valid_format())
1929                         return;
1930         }
1931         (*errors)++;
1932         INFBOUND(DRWE->badness, *errors);
1933         if (*errors > DP->max_errors.abort)
1934                 cont->done(0);
1935         if (*errors > DP->max_errors.reset)
1936                 FDCS->reset = 1;
1937         else if (*errors > DP->max_errors.recal)
1938                 DRS->track = NEED_2_RECAL;
1939 }
1940 
1941 static void set_floppy(kdev_t device)
     /* [previous][next][first][last][top][bottom][index][help] */
1942 {
1943         if (TYPE(device))
1944                 floppy = TYPE(device) + floppy_type;
1945         else
1946                 floppy = current_type[ DRIVE(device) ];
1947 }
1948 
1949 /*
1950  * formatting and support.
1951  * =======================
1952  */
1953 static void format_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1954 {
1955         switch (interpret_errors()){
1956                 case 1:
1957                         cont->error();
1958                 case 2:
1959                         break;
1960                 case 0:
1961                         cont->done(1);
1962         }
1963         cont->redo();
1964 }
1965 
1966 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
1967 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
1968 #define CT(x) ((x) | 0x40)
1969 static void setup_format_params(int track)
     /* [previous][next][first][last][top][bottom][index][help] */
1970 {
1971         struct fparm {
1972                 unsigned char track,head,sect,size;
1973         } *here = (struct fparm *)floppy_track_buffer;
1974         int il,n;
1975         int count,head_shift,track_shift;
1976 
1977         raw_cmd = &default_raw_cmd;
1978         raw_cmd->track = track;
1979 
1980         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1981                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1982         raw_cmd->rate = floppy->rate & 0x3;
1983         raw_cmd->cmd_count = NR_F;
1984         COMMAND = FM_MODE(floppy,FD_FORMAT);
1985         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
1986         F_SIZECODE = FD_SIZECODE(floppy);
1987         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1988         F_GAP = floppy->fmt_gap;
1989         F_FILL = FD_FILL_BYTE;
1990 
1991         raw_cmd->kernel_data = floppy_track_buffer;
1992         raw_cmd->length = 4 * F_SECT_PER_TRACK;
1993 
1994         /* allow for about 30ms for data transport per track */
1995         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1996 
1997         /* a ``cylinder'' is two tracks plus a little stepping time */
1998         track_shift = 2 * head_shift + 3;
1999 
2000         /* position of logical sector 1 on this track */
2001         n = (track_shift * format_req.track + head_shift * format_req.head)
2002                 % F_SECT_PER_TRACK;
2003 
2004         /* determine interleave */
2005         il = 1;
2006         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2007                 il++;
2008 
2009         /* initialize field */
2010         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2011                 here[count].track = format_req.track;
2012                 here[count].head = format_req.head;
2013                 here[count].sect = 0;
2014                 here[count].size = F_SIZECODE;
2015         }
2016         /* place logical sectors */
2017         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2018                 here[n].sect = count;
2019                 n = (n+il) % F_SECT_PER_TRACK;
2020                 if (here[n].sect) { /* sector busy, find next free sector */
2021                         ++n;
2022                         if (n>= F_SECT_PER_TRACK) {
2023                                 n-=F_SECT_PER_TRACK;
2024                                 while (here[n].sect) ++n;
2025                         }
2026                 }
2027         }
2028 }
2029 
2030 static void redo_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2031 {
2032         buffer_track = -1;
2033         setup_format_params(format_req.track << STRETCH(floppy));
2034         floppy_start();
2035 #ifdef DEBUGT
2036         debugt("queue format request");
2037 #endif
2038 }
2039 
2040 static struct cont_t format_cont={
2041         format_interrupt,
2042         redo_format,
2043         bad_flp_intr,
2044         generic_done };
2045 
2046 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /* [previous][next][first][last][top][bottom][index][help] */
2047 {
2048         int ret;
2049         int drive=DRIVE(device);
2050 
2051         LOCK_FDC(drive,1);
2052         set_floppy(device);
2053         if (!floppy ||
2054             floppy->track > DP->tracks ||
2055             tmp_format_req->track >= floppy->track ||
2056             tmp_format_req->head >= floppy->head ||
2057             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2058             !floppy->fmt_gap) {
2059                 process_fd_request();
2060                 return -EINVAL;
2061         }
2062         format_req = *tmp_format_req;
2063         format_errors = 0;
2064         cont = &format_cont;
2065         errors = &format_errors;
2066         IWAIT(redo_format);
2067         process_fd_request();
2068         return ret;
2069 }
2070 
2071 /*
2072  * Buffer read/write and support
2073  * =============================
2074  */
2075 
2076 /* new request_done. Can handle physical sectors which are smaller than a
2077  * logical buffer */
2078 static void request_done(int uptodate)
     /* [previous][next][first][last][top][bottom][index][help] */
2079 {
2080         int block;
2081 
2082         probing = 0;
2083         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2084 
2085         if (!CURRENT){
2086                 DPRINT("request list destroyed in floppy request done\n");
2087                 return;
2088         }
2089         if (uptodate){
2090                 /* maintain values for invalidation on geometry
2091                  * change */
2092                 block = current_count_sectors + CURRENT->sector;
2093                 INFBOUND(DRS->maxblock, block);
2094                 if (block > floppy->sect)
2095                         DRS->maxtrack = 1;
2096 
2097                 /* unlock chained buffers */
2098                 while (current_count_sectors && CURRENT &&
2099                        current_count_sectors >= CURRENT->current_nr_sectors){
2100                         current_count_sectors -= CURRENT->current_nr_sectors;
2101                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2102                         CURRENT->sector += CURRENT->current_nr_sectors;
2103                         end_request(1);
2104                 }
2105                 if (current_count_sectors && CURRENT){
2106                         /* "unlock" last subsector */
2107                         CURRENT->buffer += current_count_sectors <<9;
2108                         CURRENT->current_nr_sectors -= current_count_sectors;
2109                         CURRENT->nr_sectors -= current_count_sectors;
2110                         CURRENT->sector += current_count_sectors;
2111                         return;
2112                 }
2113 
2114                 if (current_count_sectors && !CURRENT)
2115                         DPRINT("request list destroyed in floppy request done\n");
2116 
2117         } else {
2118                 if (CURRENT->cmd == WRITE) {
2119                         /* record write error information */
2120                         DRWE->write_errors++;
2121                         if (DRWE->write_errors == 1) {
2122                                 DRWE->first_error_sector = CURRENT->sector;
2123                                 DRWE->first_error_generation = DRS->generation;
2124                         }
2125                         DRWE->last_error_sector = CURRENT->sector;
2126                         DRWE->last_error_generation = DRS->generation;
2127                 }
2128                 end_request(0);
2129         }
2130 }
2131 
2132 /* Interrupt handler evaluating the result of the r/w operation */
2133 static void rw_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2134 {
2135         int nr_sectors, ssize;
2136 
2137         if (!DRS->first_read_date)
2138                 DRS->first_read_date = jiffies;
2139 
2140         nr_sectors = 0;
2141         CODE2SIZE;
2142         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2143                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2144                 (sector_t % floppy->sect) % ssize;
2145 
2146 #ifdef FLOPPY_SANITY_CHECK
2147         if (nr_sectors > current_count_sectors + ssize -
2148              (current_count_sectors + sector_t) % ssize +
2149              sector_t % ssize){
2150                 DPRINT2("long rw: %x instead of %lx\n",
2151                         nr_sectors, current_count_sectors);
2152                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2153                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2154                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2155                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2156                        sector_t, ssize);
2157         }
2158 #endif
2159         INFBOUND(nr_sectors,0);
2160         SUPBOUND(current_count_sectors, nr_sectors);
2161 
2162         switch (interpret_errors()){
2163                 case 2:
2164                         cont->redo();
2165                         return;
2166                 case 1:
2167                         if (!current_count_sectors){
2168                                 cont->error();
2169                                 cont->redo();
2170                                 return;
2171                         }
2172                         break;
2173                 case 0:
2174                         if (!current_count_sectors){
2175                                 cont->redo();
2176                                 return;
2177                         }
2178                         current_type[current_drive] = floppy;
2179                         floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
2180                         break;
2181         }
2182 
2183         if (probing) {
2184                 if (DP->flags & FTD_MSG)
2185                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2186                                 floppy->name,current_drive);
2187                 current_type[current_drive] = floppy;
2188                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2189                 probing = 0;
2190         }
2191 
2192         if (CT(COMMAND) != FD_READ || 
2193              raw_cmd->kernel_data == CURRENT->buffer){
2194                 /* transfer directly from buffer */
2195                 cont->done(1);
2196         } else if (CT(COMMAND) == FD_READ){
2197                 buffer_track = raw_cmd->track;
2198                 buffer_drive = current_drive;
2199                 INFBOUND(buffer_max, nr_sectors + sector_t);
2200         }
2201         cont->redo();
2202 }
2203 
2204 /* Compute maximal contiguous buffer size. */
2205 static int buffer_chain_size(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2206 {
2207         struct buffer_head *bh;
2208         int size;
2209         char *base;
2210 
2211         base = CURRENT->buffer;
2212         size = CURRENT->current_nr_sectors << 9;
2213         bh = CURRENT->bh;
2214 
2215         if (bh){
2216                 bh = bh->b_reqnext;
2217                 while (bh && bh->b_data == base + size){
2218                         size += bh->b_size;
2219                         bh = bh->b_reqnext;
2220                 }
2221         }
2222         return size >> 9;
2223 }
2224 
2225 /* Compute the maximal transfer size */
2226 static int transfer_size(int ssize, int max_sector, int max_size)
     /* [previous][next][first][last][top][bottom][index][help] */
2227 {
2228         SUPBOUND(max_sector, sector_t + max_size);
2229 
2230         /* alignment */
2231         max_sector -= (max_sector % floppy->sect) % ssize;
2232 
2233         /* transfer size, beginning not aligned */
2234         current_count_sectors = max_sector - sector_t ;
2235 
2236         return max_sector;
2237 }
2238 
2239 /*
2240  * Move data from/to the track buffer to/from the buffer cache.
2241  */
2242 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /* [previous][next][first][last][top][bottom][index][help] */
2243 {
2244         int remaining; /* number of transferred 512-byte sectors */
2245         struct buffer_head *bh;
2246         char *buffer, *dma_buffer;
2247         int size;
2248 
2249         max_sector = transfer_size(ssize,
2250                                    minimum(max_sector, max_sector_2),
2251                                    CURRENT->nr_sectors);
2252 
2253         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2254             buffer_max > sector_t + CURRENT->nr_sectors)
2255                 current_count_sectors = minimum(buffer_max - sector_t,
2256                                                 CURRENT->nr_sectors);
2257 
2258         remaining = current_count_sectors << 9;
2259 #ifdef FLOPPY_SANITY_CHECK
2260         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2261             CT(COMMAND) == FD_WRITE){
2262                 DPRINT("in copy buffer\n");
2263                 printk("current_count_sectors=%ld\n", current_count_sectors);
2264                 printk("remaining=%d\n", remaining >> 9);
2265                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2266                 printk("CURRENT->current_nr_sectors=%ld\n",
2267                        CURRENT->current_nr_sectors);
2268                 printk("max_sector=%d\n", max_sector);
2269                 printk("ssize=%d\n", ssize);
2270         }
2271 #endif
2272 
2273         buffer_max = maximum(max_sector, buffer_max);
2274 
2275         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2276 
2277         bh = CURRENT->bh;
2278         size = CURRENT->current_nr_sectors << 9;
2279         buffer = CURRENT->buffer;
2280 
2281         while (remaining > 0){
2282                 SUPBOUND(size, remaining);
2283 #ifdef FLOPPY_SANITY_CHECK
2284                 if (dma_buffer + size >
2285                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2286                     dma_buffer < floppy_track_buffer){
2287                         DPRINT1("buffer overrun in copy buffer %d\n",
2288                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2289                         printk("sector_t=%d buffer_min=%d\n",
2290                                sector_t, buffer_min);
2291                         printk("current_count_sectors=%ld\n",
2292                                current_count_sectors);
2293                         if (CT(COMMAND) == FD_READ)
2294                                 printk("read\n");
2295                         if (CT(COMMAND) == FD_READ)
2296                                 printk("write\n");
2297                         break;
2298                 }
2299                 if (((unsigned long)buffer) % 512)
2300                         DPRINT1("%p buffer not aligned\n", buffer);
2301 #endif
2302                 if (CT(COMMAND) == FD_READ) {
2303                         fd_cacheflush(dma_buffer, size);
2304                         memcpy(buffer, dma_buffer, size);
2305                 } else {
2306                         memcpy(dma_buffer, buffer, size);
2307                         fd_cacheflush(dma_buffer, size);
2308                 }
2309                 remaining -= size;
2310                 if (!remaining)
2311                         break;
2312 
2313                 dma_buffer += size;
2314                 bh = bh->b_reqnext;
2315 #ifdef FLOPPY_SANITY_CHECK
2316                 if (!bh){
2317                         DPRINT("bh=null in copy buffer after copy\n");
2318                         break;
2319                 }
2320 #endif
2321                 size = bh->b_size;
2322                 buffer = bh->b_data;
2323         }
2324 #ifdef FLOPPY_SANITY_CHECK
2325         if (remaining){
2326                 if (remaining > 0)
2327                         max_sector -= remaining >> 9;
2328                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2329         }
2330 #endif
2331 }
2332 
2333 /*
2334  * Formulate a read/write request.
2335  * this routine decides where to load the data (directly to buffer, or to
2336  * tmp floppy area), how much data to load (the size of the buffer, the whole
2337  * track, or a single sector)
2338  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2339  * allocation on the fly, it should be done here. No other part should need
2340  * modification.
2341  */
2342 
2343 static int make_raw_rw_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2344 {
2345         int aligned_sector_t;
2346         int max_sector, max_size, tracksize, ssize;
2347 
2348         set_fdc(DRIVE(CURRENT->rq_dev));
2349 
2350         raw_cmd = &default_raw_cmd;
2351         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2352                 FD_RAW_NEED_SEEK;
2353         raw_cmd->cmd_count = NR_RW;
2354         if (CURRENT->cmd == READ){
2355                 raw_cmd->flags |= FD_RAW_READ;
2356                 COMMAND = FM_MODE(floppy,FD_READ);
2357         } else if (CURRENT->cmd == WRITE){
2358                 raw_cmd->flags |= FD_RAW_WRITE;
2359                 COMMAND = FM_MODE(floppy,FD_WRITE);
2360         } else {
2361                 DPRINT("make_raw_rw_request: unknown command\n");
2362                 return 0;
2363         }
2364 
2365         max_sector = floppy->sect * floppy->head;
2366 
2367         TRACK = CURRENT->sector / max_sector;
2368         sector_t = CURRENT->sector % max_sector;
2369         if (floppy->track && TRACK >= floppy->track)
2370                 return 0;
2371         HEAD = sector_t / floppy->sect;
2372 
2373         if (((floppy->stretch & FD_SWAPSIDES) || TESTF(FD_NEED_TWADDLE)) &&
2374             sector_t < floppy->sect)
2375                 max_sector = floppy->sect;
2376 
2377         /* 2M disks have phantom sectors on the first track */
2378         if ((floppy->rate & FD_2M) && (!TRACK) && (!HEAD)){
2379                 max_sector = 2 * floppy->sect / 3;
2380                 if (sector_t >= max_sector){
2381                         current_count_sectors = minimum(floppy->sect - sector_t,
2382                                                         CURRENT->nr_sectors);
2383                         return 1;
2384                 }
2385                 SIZECODE = 2;
2386         } else
2387                 SIZECODE = FD_SIZECODE(floppy);
2388         raw_cmd->rate = floppy->rate & 3;
2389         if ((floppy->rate & FD_2M) &&
2390             (TRACK || HEAD) &&
2391             raw_cmd->rate == 2)
2392                 raw_cmd->rate = 1;
2393 
2394         if (SIZECODE)
2395                 SIZECODE2 = 0xff;
2396         else
2397                 SIZECODE2 = 0x80;
2398         raw_cmd->track = TRACK << STRETCH(floppy);
2399         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2400         GAP = floppy->gap;
2401         CODE2SIZE;
2402         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2403         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2404         tracksize = floppy->sect - floppy->sect % ssize;
2405         if (tracksize < floppy->sect){
2406                 SECT_PER_TRACK ++;
2407                 if (tracksize <= sector_t % floppy->sect)
2408                         SECTOR--;
2409                 while (tracksize <= sector_t % floppy->sect){
2410                         while(tracksize + ssize > floppy->sect){
2411                                 SIZECODE--;
2412                                 ssize >>= 1;
2413                         }
2414                         SECTOR++; SECT_PER_TRACK ++;
2415                         tracksize += ssize;
2416                 }
2417                 max_sector = HEAD * floppy->sect + tracksize;
2418         } else if (!TRACK && !HEAD && !(floppy->rate & FD_2M) && probing)
2419                 max_sector = floppy->sect;
2420 
2421         aligned_sector_t = sector_t - (sector_t % floppy->sect) % ssize;
2422         max_size = CURRENT->nr_sectors;
2423         if ((raw_cmd->track == buffer_track) && 
2424             (current_drive == buffer_drive) &&
2425             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2426                 /* data already in track buffer */
2427                 if (CT(COMMAND) == FD_READ) {
2428                         copy_buffer(1, max_sector, buffer_max);
2429                         return 1;
2430                 }
2431         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2432                 if (CT(COMMAND) == FD_WRITE){
2433                         if (sector_t + CURRENT->nr_sectors > ssize &&
2434                             sector_t + CURRENT->nr_sectors < ssize + ssize)
2435                                 max_size = ssize + ssize;
2436                         else
2437                                 max_size = ssize;
2438                 }
2439                 raw_cmd->flags &= ~FD_RAW_WRITE;
2440                 raw_cmd->flags |= FD_RAW_READ;
2441                 COMMAND = FM_MODE(floppy,FD_READ);
2442         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS) {
2443                 int direct, indirect;
2444 
2445                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2446                         sector_t;
2447 
2448                 max_size = minimum(buffer_chain_size(),
2449                                    (MAX_DMA_ADDRESS - 
2450                                     ((unsigned long) CURRENT->buffer))>>9);
2451                 /* 64 kb boundaries */
2452                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2453                         max_size = (K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2454                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2455                 /*
2456                  * We try to read tracks, but if we get too many errors, we
2457                  * go back to reading just one sector at a time.
2458                  *
2459                  * This means we should be able to read a sector even if there
2460                  * are other bad sectors on this track.
2461                  */
2462                 if (!direct ||
2463                     (indirect * 2 > direct * 3 &&
2464                      *errors < DP->max_errors.read_track &&
2465                      /*!TESTF(FD_NEED_TWADDLE) &&*/
2466                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2467                         max_size = CURRENT->nr_sectors;
2468                 } else {
2469                         raw_cmd->kernel_data = CURRENT->buffer;
2470                         raw_cmd->length = current_count_sectors << 9;
2471                         if (raw_cmd->length == 0){
2472                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2473                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2474                                         indirect, direct, sector_t);
2475                                 return 0;
2476                         }
2477                         return 2;
2478                 }
2479         }
2480 
2481         if (CT(COMMAND) == FD_READ)
2482                 max_size = max_sector; /* unbounded */
2483 
2484         /* claim buffer track if needed */
2485         if (buffer_track != raw_cmd->track ||  /* bad track */
2486             buffer_drive !=current_drive || /* bad drive */
2487             sector_t > buffer_max ||
2488             sector_t < buffer_min ||
2489             ((CT(COMMAND) == FD_READ ||
2490               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize))&&
2491              max_sector > 2 * max_buffer_sectors + buffer_min &&
2492              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2493             /* not enough space */){
2494                 buffer_track = -1;
2495                 buffer_drive = current_drive;
2496                 buffer_max = buffer_min = aligned_sector_t;
2497         }
2498         raw_cmd->kernel_data = floppy_track_buffer + 
2499                 ((aligned_sector_t-buffer_min)<<9);
2500 
2501         if (CT(COMMAND) == FD_WRITE){
2502                 /* copy write buffer to track buffer.
2503                  * if we get here, we know that the write
2504                  * is either aligned or the data already in the buffer
2505                  * (buffer will be overwritten) */
2506 #ifdef FLOPPY_SANITY_CHECK
2507                 if (sector_t != aligned_sector_t && buffer_track == -1)
2508                         DPRINT("internal error offset !=0 on write\n");
2509 #endif
2510                 buffer_track = raw_cmd->track;
2511                 buffer_drive = current_drive;
2512                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2513         } else
2514                 transfer_size(ssize, max_sector,
2515                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2516 
2517         /* round up current_count_sectors to get dma xfer size */
2518         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2519         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2520         raw_cmd->length <<= 9;
2521 #ifdef FLOPPY_SANITY_CHECK
2522         if ((raw_cmd->length < current_count_sectors << 9) ||
2523             (raw_cmd->kernel_data != CURRENT->buffer &&
2524              CT(COMMAND) == FD_WRITE &&
2525              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2526               aligned_sector_t < buffer_min)) ||
2527             raw_cmd->length % (128 << SIZECODE) ||
2528             raw_cmd->length <= 0 || current_count_sectors <= 0){
2529                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2530                         raw_cmd->length, current_count_sectors);
2531                 if (raw_cmd->kernel_data != CURRENT->buffer)
2532                         printk("addr=%d, length=%ld\n",
2533                                (int) ((raw_cmd->kernel_data - 
2534                                        floppy_track_buffer) >> 9),
2535                                current_count_sectors);
2536                 printk("st=%d ast=%d mse=%d msi=%d\n",
2537                        sector_t, aligned_sector_t, max_sector, max_size);
2538                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2539                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2540                        COMMAND, SECTOR, HEAD, TRACK);
2541                 printk("buffer drive=%d\n", buffer_drive);
2542                 printk("buffer track=%d\n", buffer_track);
2543                 printk("buffer_min=%d\n", buffer_min);
2544                 printk("buffer_max=%d\n", buffer_max);
2545                 return 0;
2546         }
2547 
2548         if (raw_cmd->kernel_data != CURRENT->buffer){
2549                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2550                     current_count_sectors < 0 ||
2551                     raw_cmd->length < 0 ||
2552                     raw_cmd->kernel_data + raw_cmd->length >
2553                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2554                         DPRINT("buffer overrun in schedule dma\n");
2555                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2556                                sector_t, buffer_min,
2557                                raw_cmd->length >> 9);
2558                         printk("current_count_sectors=%ld\n",
2559                                current_count_sectors);
2560                         if (CT(COMMAND) == FD_READ)
2561                                 printk("read\n");
2562                         if (CT(COMMAND) == FD_READ)
2563                                 printk("write\n");
2564                         return 0;
2565                 }
2566         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2567                    current_count_sectors > CURRENT->nr_sectors){
2568                 DPRINT("buffer overrun in direct transfer\n");
2569                 return 0;
2570         } else if (raw_cmd->length < current_count_sectors << 9){
2571                 DPRINT("more sectors than bytes\n");
2572                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2573                 printk("sectors=%ld\n", current_count_sectors);
2574         }
2575         if (raw_cmd->length == 0){
2576                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2577                 return 0;
2578         }
2579 #endif
2580         return 2;
2581 }
2582 
2583 static void redo_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2584 {
2585 #define REPEAT {request_done(0); continue; }
2586         kdev_t device;
2587         int tmp;
2588 
2589         lastredo = jiffies;
2590         if (current_drive < N_DRIVE)
2591                 floppy_off(current_drive);
2592 
2593         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2594                 DPRINT("current not active!\n");
2595                 return;
2596         }
2597 
2598         while(1){
2599                 if (!CURRENT) {
2600                         CLEAR_INTR;
2601                         unlock_fdc();
2602                         return;
2603                 }
2604                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2605                         panic(DEVICE_NAME ": request list destroyed");
2606                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2607                         panic(DEVICE_NAME ": block not locked");
2608 
2609                 device = CURRENT->rq_dev;
2610                 set_fdc(DRIVE(device));
2611                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2612 
2613                 set_floppy(device);
2614                 raw_cmd = & default_raw_cmd;
2615                 raw_cmd->flags = 0;
2616                 if (start_motor(redo_fd_request)) return;
2617                 if (test_bit(current_drive, &fake_change) ||
2618                    TESTF(FD_DISK_CHANGED)){
2619                         DPRINT("disk absent or changed during operation\n");
2620                         REPEAT;
2621                 }
2622                 if (!floppy) { /* Autodetection */
2623                         if (!probing){
2624                                 DRS->probed_format = 0;
2625                                 if (next_valid_format()){
2626                                         DPRINT("no autodetectable formats\n");
2627                                         floppy = NULL;
2628                                         REPEAT;
2629                                 }
2630                         }
2631                         probing = 1;
2632                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2633                 } else
2634                         probing = 0;
2635                 errors = & (CURRENT->errors);
2636                 tmp = make_raw_rw_request();
2637                 if (tmp < 2){
2638                         request_done(tmp);
2639                         continue;
2640                 }
2641 
2642                 if (TESTF(FD_NEED_TWADDLE))
2643                         twaddle();
2644                 floppy_tq.routine = (void *)(void *) floppy_start;
2645                 queue_task(&floppy_tq, &tq_timer);
2646 #ifdef DEBUGT
2647                 debugt("queue fd request");
2648 #endif
2649                 return;
2650         }
2651 #undef REPEAT
2652 }
2653 
2654 static struct cont_t rw_cont={
2655         rw_interrupt,
2656         redo_fd_request,
2657         bad_flp_intr,
2658         request_done };
2659 
2660 static struct tq_struct request_tq =
2661 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2662 
2663 static void process_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2664 {
2665         cont = &rw_cont;
2666         queue_task(&request_tq, &tq_timer);
2667 }
2668 
2669 static void do_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2670 {
2671         if (fdc_busy){
2672                 /* fdc busy, this new request will be treated when the
2673                    current one is done */
2674                 is_alive("do fd request, old request running");
2675                 return;
2676         }
2677         lock_fdc(MAXTIMEOUT,0);
2678         process_fd_request();
2679         is_alive("do fd request");
2680 }
2681 
2682 static struct cont_t poll_cont={
2683         success_and_wakeup,
2684         floppy_ready,
2685         generic_failure,
2686         generic_done };
2687 
2688 static int poll_drive(int interruptible, int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2689 {
2690         int ret;
2691         /* no auto-sense, just clear dcl */
2692         raw_cmd = &default_raw_cmd;
2693         raw_cmd->flags= flag;
2694         raw_cmd->track=0;
2695         raw_cmd->cmd_count=0;
2696         cont = &poll_cont;
2697 #ifdef DCL_DEBUG
2698         if (DP->flags & FD_DEBUG){
2699                 DPRINT("setting NEWCHANGE in poll_drive\n");
2700         }
2701 #endif
2702         SETF(FD_DISK_NEWCHANGE);
2703         WAIT(floppy_ready);
2704         return ret;
2705 }
2706 
2707 /*
2708  * User triggered reset
2709  * ====================
2710  */
2711 
2712 static void reset_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2713 {
2714         printk("weird, reset interrupt called\n");
2715 }
2716 
2717 static struct cont_t reset_cont={
2718         reset_intr,
2719         success_and_wakeup,
2720         generic_failure,
2721         generic_done };
2722 
2723 static int user_reset_fdc(int drive, int arg, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
2724 {
2725         int ret;
2726 
2727         ret=0;
2728         LOCK_FDC(drive,interruptible);
2729         if (arg == FD_RESET_ALWAYS)
2730                 FDCS->reset=1;
2731         if (FDCS->reset){
2732                 cont = &reset_cont;
2733                 WAIT(reset_fdc);
2734         }
2735         process_fd_request();
2736         return ret;
2737 }
2738 
2739 /*
2740  * Misc Ioctl's and support
2741  * ========================
2742  */
2743 static int fd_copyout(void *param, const void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2744 {
2745         int ret;
2746 
2747         ECALL(verify_area(VERIFY_WRITE,param,size));
2748         fd_cacheflush(address, size); /* is this necessary ??? */
2749         /* Ralf: Yes; only the l2 cache is completly chipset
2750            controlled */
2751         memcpy_tofs(param,(void *) address, size);
2752         return 0;
2753 }
2754 
2755 static int fd_copyin(void *param, void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2756 {
2757         int ret;
2758 
2759         ECALL(verify_area(VERIFY_READ,param,size));
2760         memcpy_fromfs((void *) address, param, size);
2761         return 0;
2762 }
2763 
2764 #define COPYOUT(x) ECALL(fd_copyout((void *)param, &(x), sizeof(x)))
2765 #define COPYIN(x) ECALL(fd_copyin((void *)param, &(x), sizeof(x)))
2766 
2767 static inline const char *drive_name(int type, int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
2768 {
2769         struct floppy_struct *floppy;
2770 
2771         if (type)
2772                 floppy = floppy_type + type;
2773         else {
2774                 if (UDP->native_format)
2775                         floppy = floppy_type + UDP->native_format;
2776                 else
2777                         return "(null)";
2778         }
2779         if (floppy->name)
2780                 return floppy->name;
2781         else
2782                 return "(null)";
2783 }
2784 
2785 
2786 /* raw commands */
2787 static void raw_cmd_done(int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2788 {
2789         int i;
2790 
2791         if (!flag) {
2792                 raw_cmd->flags = FD_RAW_FAILURE;
2793                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2794         } else {
2795                 raw_cmd->reply_count = inr;
2796                 for (i=0; i< raw_cmd->reply_count; i++)
2797                         raw_cmd->reply[i] = reply_buffer[i];
2798 
2799                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE))
2800                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2801                 
2802                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2803                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2804                         raw_cmd->flags |= FD_RAW_FAILURE;
2805 
2806                 if (disk_change(current_drive))
2807                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2808                 else
2809                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2810                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2811                         motor_off_callback(current_drive);
2812 
2813                 if (raw_cmd->next &&
2814                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2815                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2816                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2817                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2818                         raw_cmd = raw_cmd->next;
2819                         return;
2820                 }
2821         }
2822         generic_done(flag);
2823 }
2824 
2825 
2826 static struct cont_t raw_cmd_cont={
2827         success_and_wakeup,
2828         floppy_start,
2829         generic_failure,
2830         raw_cmd_done
2831 };
2832 
2833 static inline int raw_cmd_copyout(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2834                                   struct floppy_raw_cmd *ptr)
2835 {
2836         struct old_floppy_raw_cmd old_raw_cmd;
2837         int ret;
2838 
2839         while(ptr) {
2840                 if (cmd == OLDFDRAWCMD) {
2841                         old_raw_cmd.flags = ptr->flags;
2842                         old_raw_cmd.data = ptr->data;
2843                         old_raw_cmd.length = ptr->length;
2844                         old_raw_cmd.rate = ptr->rate;
2845                         old_raw_cmd.reply_count = ptr->reply_count;
2846                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2847                         COPYOUT(old_raw_cmd);
2848                         param += sizeof(old_raw_cmd);
2849                 } else {
2850                         COPYOUT(*ptr);
2851                         param += sizeof(struct floppy_raw_cmd);
2852                 }
2853 
2854                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2855                         if (ptr->length>=0 && ptr->length<=ptr->buffer_length)
2856                                 ECALL(fd_copyout(ptr->data, 
2857                                                  ptr->kernel_data, 
2858                                                  ptr->buffer_length - 
2859                                                  ptr->length));
2860                 }
2861                 ptr = ptr->next;
2862         }
2863         return 0;
2864 }
2865 
2866 
2867 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /* [previous][next][first][last][top][bottom][index][help] */
2868 {
2869         struct floppy_raw_cmd *next,*this;
2870 
2871         this = *ptr;
2872         *ptr = 0;
2873         while(this) {
2874                 if (this->buffer_length) {
2875                         free_pages((unsigned long)this->kernel_data,
2876                                    __get_order(this->buffer_length));
2877                         this->buffer_length = 0;
2878                 }
2879                 next = this->next;
2880                 kfree(this);
2881                 this = next;
2882         }
2883 }
2884 
2885 
2886 static inline int raw_cmd_copyin(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2887                                  struct floppy_raw_cmd **rcmd)
2888 {
2889         struct floppy_raw_cmd *ptr;
2890         struct old_floppy_raw_cmd old_raw_cmd;
2891         int ret;
2892         int i;
2893         
2894         *rcmd = 0;
2895         while(1) {
2896                 ptr = (struct floppy_raw_cmd *) 
2897                         kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
2898                 if (!ptr)
2899                         return -ENOMEM;
2900                 *rcmd = ptr;
2901                 if (cmd == OLDFDRAWCMD){
2902                         COPYIN(old_raw_cmd);
2903                         ptr->flags = old_raw_cmd.flags;
2904                         ptr->data = old_raw_cmd.data;
2905                         ptr->length = old_raw_cmd.length;
2906                         ptr->rate = old_raw_cmd.rate;
2907                         ptr->cmd_count = old_raw_cmd.cmd_count;
2908                         ptr->track = old_raw_cmd.track;
2909                         ptr->phys_length = 0;
2910                         ptr->next = 0;
2911                         ptr->buffer_length = 0;
2912                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
2913                         param += sizeof(struct old_floppy_raw_cmd);
2914                         if (ptr->cmd_count > 9)
2915                                 return -EINVAL;
2916                 } else {
2917                         COPYIN(*ptr);
2918                         ptr->next = 0;
2919                         ptr->buffer_length = 0;
2920                         param += sizeof(struct floppy_raw_cmd);
2921                         if (ptr->cmd_count > 16)
2922                                 return -EINVAL;
2923                 }
2924 
2925                 for (i=0; i< 16; i++)
2926                         ptr->reply[i] = 0;
2927                 ptr->resultcode = 0;
2928                 ptr->kernel_data = 0;
2929 
2930                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
2931                         if (ptr->length <= 0)
2932                                 return -EINVAL;
2933                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
2934                         if (!ptr->kernel_data)
2935                                 return -ENOMEM;
2936                         ptr->buffer_length = ptr->length;
2937                 }
2938                 if ( ptr->flags & FD_RAW_READ )
2939                     ECALL( verify_area( VERIFY_WRITE, ptr->data, 
2940                                         ptr->length ));
2941                 if (ptr->flags & FD_RAW_WRITE)
2942                         ECALL(fd_copyin(ptr->data, ptr->kernel_data, 
2943                                         ptr->length));
2944                 rcmd = & (ptr->next);
2945                 if (!(ptr->flags & FD_RAW_MORE))
2946                         return 0;
2947                 ptr->rate &= 0x03;
2948         }
2949 }
2950 
2951 
2952 static int raw_cmd_ioctl(int cmd, void *param)
     /* [previous][next][first][last][top][bottom][index][help] */
2953 {
2954         int drive, ret, ret2;
2955         struct floppy_raw_cmd *my_raw_cmd;
2956 
2957         if (FDCS->rawcmd <= 1)
2958                 FDCS->rawcmd = 1;
2959         for (drive= 0; drive < N_DRIVE; drive++){
2960                 if (FDC(drive) != fdc)
2961                         continue;
2962                 if (drive == current_drive){
2963                         if (UDRS->fd_ref > 1){
2964                                 FDCS->rawcmd = 2;
2965                                 break;
2966                         }
2967                 } else if (UDRS->fd_ref){
2968                         FDCS->rawcmd = 2;
2969                         break;
2970                 }
2971         }
2972 
2973         if (FDCS->reset)
2974                 return -EIO;
2975 
2976         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
2977         if (ret) {
2978                 raw_cmd_free(&my_raw_cmd);
2979                 return ret;
2980         }
2981 
2982         raw_cmd = my_raw_cmd;
2983         cont = &raw_cmd_cont;
2984         ret=wait_til_done(floppy_start,1);
2985 #ifdef DCL_DEBUG
2986         if (DP->flags & FD_DEBUG){
2987                 DPRINT("calling disk change from raw_cmd ioctl\n");
2988         }
2989 #endif
2990 
2991         if (ret != -EINTR && FDCS->reset)
2992                 ret = -EIO;
2993 
2994         DRS->track = NO_TRACK;
2995 
2996         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
2997         if (!ret)
2998                 ret = ret2;
2999         raw_cmd_free(&my_raw_cmd);
3000         return ret;
3001 }
3002 
3003 static int invalidate_drive(kdev_t rdev)
     /* [previous][next][first][last][top][bottom][index][help] */
3004 {
3005         /* invalidate the buffer track to force a reread */
3006         set_bit(DRIVE(rdev), &fake_change);
3007         process_fd_request();
3008         check_disk_change(rdev);
3009         return 0;
3010 }
3011 
3012 
3013 static inline void clear_write_error(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
3014 {
3015         CLEARSTRUCT(UDRWE);
3016 }
3017 
3018 static inline int set_geometry(int cmd, struct floppy_struct *g,
     /* [previous][next][first][last][top][bottom][index][help] */
3019                                int drive, int type, int device)
3020 {
3021         int cnt;
3022 
3023         /* sanity checking for parameters.*/
3024         if (g->sect <= 0 ||
3025             g->head <= 0 ||
3026             g->track <= 0 ||
3027             g->track > UDP->tracks>>STRETCH(g) ||
3028             /* check if reserved bits are set */
3029             (g->stretch&~(FD_STRETCH|FD_SWAPSIDES)) != 0)
3030                 return -EINVAL;
3031         if (type){
3032                 if (!suser())
3033                         return -EPERM;
3034                 LOCK_FDC(drive,1);
3035                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3036                         if (TYPE(drive_state[cnt].fd_device) ==
3037                             type &&
3038                             drive_state[cnt].fd_ref)
3039                                 set_bit(drive, &fake_change);
3040                 }
3041                 floppy_type[type] = *g;
3042                 floppy_type[type].name="user format";
3043                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3044                         floppy_sizes[cnt]= floppy_sizes[cnt+0x80]=
3045                                 floppy_type[type].size>>1;
3046                 process_fd_request();
3047                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3048                         if (TYPE(drive_state[cnt].fd_device) == type &&
3049                             drive_state[cnt].fd_ref)
3050                                 check_disk_change(drive_state[cnt].fd_device);
3051                 }
3052         } else {
3053                 LOCK_FDC(drive,1);
3054                 if (cmd != FDDEFPRM)
3055                         /* notice a disk change immediately, else
3056                          * we loose our settings immediately*/
3057                         CALL(poll_drive(1,0));
3058                 user_params[drive] = *g;
3059                 if (buffer_drive == drive)
3060                         SUPBOUND(buffer_max, user_params[drive].sect);
3061                 current_type[drive] = &user_params[drive];
3062                 floppy_sizes[drive] = user_params[drive].size >> 1;
3063                 if (cmd == FDDEFPRM)
3064                         DRS->keep_data = -1;
3065                 else
3066                         DRS->keep_data = 1;
3067                 /* invalidation. Invalidate only when needed, i.e.
3068                  * when there are already sectors in the buffer cache
3069                  * whose number will change. This is useful, because
3070                  * mtools often changes the geometry of the disk after
3071                  * looking at the boot block */
3072                 if (DRS->maxblock > user_params[drive].sect || DRS->maxtrack)
3073                         invalidate_drive(device);
3074                 else
3075                         process_fd_request();
3076         }
3077         return 0;
3078 }
3079 
3080 /* handle obsolete ioctl's */
3081 static struct translation_entry {
3082     int newcmd;
3083     int oldcmd;
3084     int oldsize; /* size of 0x00xx-style ioctl. Reflects old structures, thus
3085                   * use numeric values. NO SIZEOFS */
3086 } translation_table[]= {
3087     {FDCLRPRM,           0,  0},
3088     {FDSETPRM,           1, 28},
3089     {FDDEFPRM,           2, 28},
3090     {FDGETPRM,           3, 28},
3091     {FDMSGON,            4,  0},
3092     {FDMSGOFF,           5,  0},
3093     {FDFMTBEG,           6,  0},
3094     {FDFMTTRK,           7, 12},
3095     {FDFMTEND,           8,  0},
3096     {FDSETEMSGTRESH,    10,  0},
3097     {FDFLUSH,           11,  0},
3098     {FDSETMAXERRS,      12, 20},
3099     {OLDFDRAWCMD,       30,  0},
3100     {FDGETMAXERRS,      14, 20},
3101     {FDGETDRVTYP,       16, 16},
3102     {FDSETDRVPRM,       20, 88},
3103     {FDGETDRVPRM,       21, 88},
3104     {FDGETDRVSTAT,      22, 52},
3105     {FDPOLLDRVSTAT,     23, 52},
3106     {FDRESET,           24,  0},
3107     {FDGETFDCSTAT,      25, 40},
3108     {FDWERRORCLR,       27,  0},
3109     {FDWERRORGET,       28, 24},
3110     {FDRAWCMD,           0,  0},
3111     {FDTWADDLE,         40,  0} };
3112 
3113 static inline int normalize_0x02xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3114 {
3115         int i, orig_size, ocmd;
3116 
3117         orig_size = IOC_SIZE(*cmd);
3118         ocmd = *cmd;
3119         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3120                 if ((*cmd & 0xff3f) == (translation_table[i].newcmd & 0xff3f)){
3121                         *cmd = translation_table[i].newcmd;
3122                         if (!orig_size && IOC_SIZE(*cmd)) {
3123                                 /* kernels 1.3.34 to 1.3.37 : */
3124                                 *size = IOC_SIZE(*cmd); 
3125                                 DPRINT1("warning: obsolete ioctl 0x%x\n",ocmd);
3126                                 DPRINT("please recompile your program\n");
3127                                 /* these ioctls only existed
3128                                  * in two (development)
3129                                  * kernels anyways. That's why we
3130                                  * complain about these, and not about
3131                                  * the much older 0x00xx ioctl's
3132                                  */
3133                         } else {
3134                                 *size = orig_size;
3135                                 if (*size > IOC_SIZE(*cmd)) {
3136                                         printk("ioctl not yet supported\n");
3137                                         return -EFAULT;
3138                                 }
3139                         }
3140                         return 0;
3141                 }
3142         }
3143         return -EINVAL;
3144 }
3145 
3146 static inline int xlate_0x00xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3147 {
3148         int i;
3149         /* kernels <= 1.3.33 */
3150         /* we might want to start warning in 1.4.x (by then, no user
3151          * programs will have an excuse to use the old ioctls: there
3152          * will be a stable kernel supporting them :)
3153          *
3154          * when the first 1.5.x kernel will come out, this loop will
3155          * be removed as well.
3156          */
3157         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3158                 if (*cmd == translation_table[i].oldcmd) {
3159                         *size = translation_table[i].oldsize;
3160                         *cmd = translation_table[i].newcmd;
3161                         return 0;
3162                 }
3163         }
3164         return -EINVAL;
3165 }
3166 
3167 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /* [previous][next][first][last][top][bottom][index][help] */
3168                     unsigned long param)
3169 {
3170 #define IOCTL_MODE_BIT 8
3171 #define OPEN_WRITE_BIT 16
3172 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3173 #define OUT(c,x) case c: outparam = (const char *) (x); break
3174 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3175 
3176         int i,drive,type;
3177         kdev_t device;
3178         int ret;
3179         int size;
3180         union inparam {
3181                 struct floppy_struct g; /* geometry */
3182                 struct format_descr f;
3183                 struct floppy_max_errors max_errors;
3184                 struct floppy_drive_params dp;
3185         } inparam; /* parameters coming from user space */
3186         const char *outparam; /* parameters passed back to user space */
3187 
3188         device = inode->i_rdev;
3189         switch (cmd) {
3190                 RO_IOCTLS(device,param);
3191         }
3192         type = TYPE(device);
3193         drive = DRIVE(device);
3194 
3195         /* convert the old style command into a new style command */
3196         if ((cmd & 0xff00) == 0x0200) {
3197                 ECALL(normalize_0x02xx_ioctl(&cmd, &size));
3198         } else if ((cmd & 0xff00) == 0x0000) {
3199                 ECALL(xlate_0x00xx_ioctl(&cmd, &size));
3200         } else
3201                 return -EINVAL;
3202 
3203         /* permission checks */
3204         if (((cmd & 0x80) && !suser()) ||
3205              ((cmd & 0x40) && !IOCTL_ALLOWED))
3206                 return -EPERM;
3207 
3208         /* verify writability of result, and fail early */
3209         if (_IOC_DIR(cmd) & _IOC_WRITE)
3210                 ECALL(verify_area(VERIFY_WRITE,(void *) param, size));
3211                 
3212         /* copyin */
3213         CLEARSTRUCT(&inparam);
3214         if (_IOC_DIR(cmd) & _IOC_READ)
3215                 ECALL(fd_copyin((void *)param, &inparam, size))
3216 
3217         switch (cmd) {
3218                 case FDCLRPRM:
3219                         LOCK_FDC(drive,1);
3220                         current_type[drive] = NULL;
3221                         floppy_sizes[drive] = MAX_DISK_SIZE;
3222                         UDRS->keep_data = 0;
3223                         return invalidate_drive(device);
3224                 case FDSETPRM:
3225                 case FDDEFPRM:
3226                         return set_geometry(cmd, & inparam.g,
3227                                             drive, type, device);
3228                 case FDGETPRM:
3229                         if (type)
3230                                 outparam = (char *) &floppy_type[type];
3231                         else 
3232                                 outparam = (char *) current_type[drive];
3233                         if(!outparam)
3234                                 return -ENODEV;
3235                         break;
3236 
3237                 case FDMSGON:
3238                         UDP->flags |= FTD_MSG;
3239                         return 0;
3240                 case FDMSGOFF:
3241                         UDP->flags &= ~FTD_MSG;
3242                         return 0;
3243 
3244                 case FDFMTBEG:
3245                         return 0;
3246                 case FDFMTTRK:
3247                         if (UDRS->fd_ref != 1)
3248                                 return -EBUSY;
3249                         return do_format(device, &inparam.f);
3250                 case FDFMTEND:
3251                 case FDFLUSH:
3252                         LOCK_FDC(drive,1);
3253                         return invalidate_drive(device);
3254 
3255                 case FDSETEMSGTRESH:
3256                         UDP->max_errors.reporting =
3257                                 (unsigned short) (param & 0x0f);
3258                         return 0;
3259                 OUT(FDGETMAXERRS, &UDP->max_errors);
3260                 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3261 
3262                 case FDGETDRVTYP:
3263                         outparam = drive_name(type,drive);
3264                         SUPBOUND(size,strlen(outparam));
3265                         break;
3266 
3267                 IN(FDSETDRVPRM, UDP, dp);
3268                 OUT(FDGETDRVPRM, UDP);
3269 
3270                 case FDPOLLDRVSTAT:
3271                         LOCK_FDC(drive,1);
3272                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3273                         process_fd_request();
3274                         /* fall through */
3275                 OUT(FDGETDRVSTAT, UDRS);
3276 
3277                 case FDRESET:
3278                         return user_reset_fdc(drive, (int)param, 1);
3279 
3280                 OUT(FDGETFDCSTAT,UFDCS);
3281 
3282                 case FDWERRORCLR:
3283                         CLEARSTRUCT(UDRWE);
3284                         return 0;
3285                 OUT(FDWERRORGET,UDRWE);
3286 
3287                 case OLDFDRAWCMD:
3288                 case FDRAWCMD:
3289                         if (type)
3290                                 return -EINVAL;
3291                         LOCK_FDC(drive,1);
3292                         set_floppy(device);
3293                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3294                         process_fd_request();
3295                         return i;
3296 
3297                 case FDTWADDLE:
3298                         LOCK_FDC(drive,1);
3299                         twaddle();
3300                         process_fd_request();
3301                         return 0;
3302 
3303                 default:
3304                         return -EINVAL;
3305         }
3306 
3307         if (_IOC_DIR(cmd) & _IOC_WRITE)
3308                 return fd_copyout((void *)param, outparam, size);
3309         else
3310                 return 0;
3311 #undef IOCTL_ALLOWED
3312 #undef OUT
3313 #undef IN
3314 }
3315 
3316 static void config_types(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3317 {
3318         int first=1;
3319         int drive;
3320 
3321         /* read drive info out of physical cmos */
3322         drive=0;
3323         if (!UDP->cmos)
3324                 UDP->cmos= FLOPPY0_TYPE;
3325         drive=1;
3326         if (!UDP->cmos && FLOPPY1_TYPE)
3327                 UDP->cmos = FLOPPY1_TYPE;
3328 
3329         /* XXX */
3330         /* additional physical CMOS drive detection should go here */
3331 
3332         for (drive=0; drive < N_DRIVE; drive++){
3333                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3334                         memcpy((char *) UDP,
3335                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3336                                sizeof(struct floppy_drive_params));
3337                 if (UDP->cmos){
3338                         if (first)
3339                                 printk("Floppy drive(s): ");
3340                         else
3341                                 printk(", ");
3342                         first=0;
3343                         if (UDP->cmos > 0){
3344                                 allowed_drive_mask |= 1 << drive;
3345                                 printk("fd%d is %s", drive,
3346                                        default_drive_params[(int)UDP->cmos].name);
3347                         } else
3348                                 printk("fd%d is unknown type %d",drive,
3349                                        UDP->cmos);
3350                 }
3351         }
3352         if (!first)
3353                 printk("\n");
3354 }
3355 
3356 static int floppy_read(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3357                        char * buf, int count)
3358 {
3359         int drive = DRIVE(inode->i_rdev);
3360 
3361         check_disk_change(inode->i_rdev);
3362         if (UTESTF(FD_DISK_CHANGED))
3363                 return -ENXIO;
3364         return block_read(inode, filp, buf, count);
3365 }
3366 
3367 static int floppy_write(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3368                         const char * buf, int count)
3369 {
3370         int block;
3371         int ret;
3372         int drive = DRIVE(inode->i_rdev);
3373 
3374         if (!UDRS->maxblock)
3375                 UDRS->maxblock=1;/* make change detectable */
3376         check_disk_change(inode->i_rdev);
3377         if (UTESTF(FD_DISK_CHANGED))
3378                 return -ENXIO;
3379         if (!UTESTF(FD_DISK_WRITABLE))
3380                 return -EROFS;
3381         block = (filp->f_pos + count) >> 9;
3382         INFBOUND(UDRS->maxblock, block);
3383         ret= block_write(inode, filp, buf, count);
3384         return ret;
3385 }
3386 
3387 static void floppy_release(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3388 {
3389         int drive;
3390 
3391         drive = DRIVE(inode->i_rdev);
3392 
3393         if (!filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3394                 /* if the file is mounted OR (writable now AND writable at
3395                  * open time) Linus: Does this cover all cases? */
3396                 block_fsync(inode,filp);
3397 
3398         if (UDRS->fd_ref < 0)
3399                 UDRS->fd_ref=0;
3400         else if (!UDRS->fd_ref--) {
3401                 DPRINT("floppy_release with fd_ref == 0");
3402                 UDRS->fd_ref = 0;
3403         }
3404         floppy_release_irq_and_dma();
3405 }
3406 
3407 /*
3408  * floppy_open check for aliasing (/dev/fd0 can be the same as
3409  * /dev/PS0 etc), and disallows simultaneous access to the same
3410  * drive with different device numbers.
3411  */
3412 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3413 
3414 static int floppy_open(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3415 {
3416         int drive;
3417         int old_dev;
3418         int try;
3419         char *tmp;
3420 
3421         if (!filp) {
3422                 DPRINT("Weird, open called with filp=0\n");
3423                 return -EIO;
3424         }
3425 
3426         drive = DRIVE(inode->i_rdev);
3427         if (drive >= N_DRIVE ||
3428             !(allowed_drive_mask & (1 << drive)) ||
3429             fdc_state[FDC(drive)].version == FDC_NONE)
3430                 return -ENXIO;
3431 
3432         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3433                 return -ENXIO;
3434         old_dev = UDRS->fd_device;
3435         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3436                 return -EBUSY;
3437 
3438         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3439                 USETF(FD_DISK_CHANGED);
3440                 USETF(FD_VERIFY);
3441         }
3442 
3443         if (UDRS->fd_ref == -1 ||
3444            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3445                 return -EBUSY;
3446 
3447         if (floppy_grab_irq_and_dma())
3448                 return -EBUSY;
3449 
3450         if (filp->f_flags & O_EXCL)
3451                 UDRS->fd_ref = -1;
3452         else
3453                 UDRS->fd_ref++;
3454 
3455         if (!floppy_track_buffer){
3456                 /* if opening an ED drive, reserve a big buffer,
3457                  * else reserve a small one */
3458                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3459                         try = 64; /* Only 48 actually useful */
3460                 else
3461                         try = 32; /* Only 24 actually useful */
3462 
3463                 tmp=(char *)dma_mem_alloc(1024 * try);
3464                 if (!tmp) {
3465                         try >>= 1; /* buffer only one side */
3466                         INFBOUND(try, 16);
3467                         tmp= (char *)dma_mem_alloc(1024*try);
3468                 }
3469                 if (!tmp) {
3470                         DPRINT("Unable to allocate DMA memory\n");
3471                         RETERR(ENXIO);
3472                 }
3473                 if (floppy_track_buffer){
3474                         free_pages((unsigned long)tmp,__get_order(try*1024));
3475                 }else {
3476                         floppy_track_buffer = tmp;
3477                         max_buffer_sectors = try;
3478                 }
3479         }
3480 
3481         UDRS->fd_device = MINOR(inode->i_rdev);
3482 
3483         if (old_dev && old_dev != inode->i_rdev) {
3484                 if (buffer_drive == drive)
3485                         buffer_track = -1;
3486                 invalidate_buffers(old_dev);
3487         }
3488 
3489         /* Allow ioctls if we have write-permissions even if read-only open */
3490         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3491                 filp->f_mode |= IOCTL_MODE_BIT;
3492         if (filp->f_mode & 2)
3493                 filp->f_mode |= OPEN_WRITE_BIT;
3494 
3495         if (UFDCS->rawcmd == 1)
3496                 UFDCS->rawcmd = 2;
3497 
3498         if (filp->f_flags & O_NDELAY)
3499                 return 0;
3500         if (filp->f_mode & 3) {
3501                 UDRS->last_checked = 0;
3502                 check_disk_change(inode->i_rdev);
3503                 if (UTESTF(FD_DISK_CHANGED))
3504                         RETERR(ENXIO);
3505         }
3506         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3507                 RETERR(EROFS);
3508         return 0;
3509 #undef RETERR
3510 }
3511 
3512 /*
3513  * Check if the disk has been changed or if a change has been faked.
3514  */
3515 static int check_floppy_change(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3516 {
3517         int drive = DRIVE(dev);
3518 
3519         if (MAJOR(dev) != MAJOR_NR) {
3520                 DPRINT("floppy_changed: not a floppy\n");
3521                 return 0;
3522         }
3523 
3524         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3525                 return 1;
3526 
3527         if (UDRS->last_checked + UDP->checkfreq < jiffies){
3528                 lock_fdc(drive,0);
3529                 poll_drive(0,0);
3530                 process_fd_request();
3531         }
3532 
3533         if (UTESTF(FD_DISK_CHANGED) ||
3534            UTESTF(FD_VERIFY) ||
3535            test_bit(drive, &fake_change) ||
3536            (!TYPE(dev) && !current_type[drive]))
3537                 return 1;
3538         return 0;
3539 }
3540 
3541 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3542  * the bootblock (block 0). "Autodetection" is also needed to check whether
3543  * there is a disk in the drive at all... Thus we also do it for fixed
3544  * geometry formats */
3545 static int floppy_revalidate(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3546 {
3547 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3548         struct buffer_head * bh;
3549         int drive=DRIVE(dev);
3550         int cf;
3551 
3552         if (UTESTF(FD_DISK_CHANGED) ||
3553            UTESTF(FD_VERIFY) ||
3554            test_bit(drive, &fake_change) ||
3555            NO_GEOM){
3556                 lock_fdc(drive,0);
3557                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3558                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)){
3559                         process_fd_request(); /*already done by another thread*/
3560                         return 0;
3561                 }
3562                 UDRS->maxblock = 0;
3563                 UDRS->maxtrack = 0;
3564                 if (buffer_drive == drive)
3565                         buffer_track = -1;
3566                 clear_bit(drive, &fake_change);
3567                 UCLEARF(FD_DISK_CHANGED);
3568                 if (cf)
3569                         UDRS->generation++;
3570                 if (NO_GEOM){
3571                         /* auto-sensing */
3572                         int size = floppy_blocksizes[MINOR(dev)];
3573                         if (!size)
3574                                 size = 1024;
3575                         if (!(bh = getblk(dev,0,size))){
3576                                 process_fd_request();
3577                                 return 1;
3578                         }
3579                         if (bh && !bh->b_uptodate)
3580                                 ll_rw_block(READ, 1, &bh);
3581                         process_fd_request();
3582                         wait_on_buffer(bh);
3583                         brelse(bh);
3584                         return 0;
3585                 }
3586                 if (cf)
3587                         poll_drive(0, FD_RAW_NEED_DISK);
3588                 process_fd_request();
3589         }
3590         return 0;
3591 }
3592 
3593 static struct file_operations floppy_fops = {
3594         NULL,                   /* lseek - default */
3595         floppy_read,            /* read - general block-dev read */
3596         floppy_write,           /* write - general block-dev write */
3597         NULL,                   /* readdir - bad */
3598         NULL,                   /* select */
3599         fd_ioctl,               /* ioctl */
3600         NULL,                   /* mmap */
3601         floppy_open,            /* open */
3602         floppy_release,         /* release */
3603         block_fsync,            /* fsync */
3604         NULL,                   /* fasync */
3605         check_floppy_change,    /* media_change */
3606         floppy_revalidate,      /* revalidate */
3607 };
3608 
3609 /*
3610  * Floppy Driver initialisation
3611  * =============================
3612  */
3613 
3614 /* Determine the floppy disk controller type */
3615 /* This routine was written by David C. Niemi */
3616 static char get_fdc_version(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3617 {
3618         int r;
3619 
3620         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3621         if (FDCS->reset)
3622                 return FDC_NONE;
3623         if ((r = result()) <= 0x00)
3624                 return FDC_NONE;        /* No FDC present ??? */
3625         if ((r==1) && (reply_buffer[0] == 0x80)){
3626                 printk("FDC %d is a 8272A\n",fdc);
3627                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3628         }
3629         if (r != 10) {
3630                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3631                 return FDC_UNKNOWN;
3632         }
3633         output_byte(FD_VERSION);
3634         r = result();
3635         if ((r == 1) && (reply_buffer[0] == 0x80)){
3636                 printk("FDC %d is a 82072\n",fdc);
3637                 return FDC_82072;               /* 82072 doesn't know VERSION */
3638         }
3639         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3640                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3641                 return FDC_UNKNOWN;
3642         }
3643         output_byte(FD_UNLOCK);
3644         r = result();
3645         if ((r == 1) && (reply_buffer[0] == 0x80)){
3646                 printk("FDC %d is a pre-1991 82077\n", fdc);
3647                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3648         }
3649         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3650                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3651                 return FDC_UNKNOWN;
3652         }
3653         printk("FDC %d is a post-1991 82077\n",fdc);
3654         return FDC_82077;       /* Revised 82077AA passes all the tests */
3655 } /* get_fdc_version */
3656 
3657 /* lilo configuration */
3658 
3659 /* we make the invert_dcl function global. One day, somebody might
3660  * want to centralize all thinkpad related options into one lilo option,
3661  * there are just so many thinkpad related quirks! */
3662 void floppy_invert_dcl(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3663 {
3664         int i;
3665 
3666         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3667                 if (param)
3668                         default_drive_params[i].params.flags |= 0x80;
3669                 else
3670                         default_drive_params[i].params.flags &= ~0x80;
3671         }
3672         DPRINT("Configuring drives for inverted dcl\n");
3673 }
3674 
3675 static void daring(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3676 {
3677         int i;
3678 
3679         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3680                 if (param){
3681                         default_drive_params[i].params.select_delay = 0;
3682                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3683                 } else {
3684                         default_drive_params[i].params.select_delay = 2*HZ/100;
3685                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3686                 }
3687         }
3688         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3689 }
3690 
3691 static void allow_drives(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3692 {
3693         allowed_drive_mask=param;
3694         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3695 }
3696 
3697 static void fdc2_adr(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3698 {
3699         FDC2 = param;
3700         if (param)
3701                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3702         else
3703                 DPRINT("disabling second fdc\n");
3704 }
3705 
3706 static void unex(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3707 {
3708         print_unex = param;
3709         DPRINT1("%sprinting messages for unexpected interrupts\n",
3710                 param ? "" : "not ");
3711 }
3712 
3713 static void set_cmos(int *ints, int dummy)
     /* [previous][next][first][last][top][bottom][index][help] */
3714 {
3715         int current_drive=0;
3716 
3717         if (ints[0] != 2){
3718                 DPRINT("wrong number of parameter for cmos\n");
3719                 return;
3720         }
3721         current_drive = ints[1];
3722         if (current_drive < 0 || current_drive >= 8){
3723                 DPRINT("bad drive for set_cmos\n");
3724                 return;
3725         }
3726         if (current_drive >= 4 && !FDC2)
3727                 fdc2_adr(0, 0x370);
3728         if (ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3729                 DPRINT1("bad cmos code %d\n", ints[2]);
3730                 return;
3731         }
3732         DP->cmos = ints[2];
3733         DPRINT1("setting cmos code to %d\n", ints[2]);
3734 }
3735 
3736 static struct param_table {
3737         const char *name;
3738         void (*fn)(int *ints, int param);
3739         int def_param;
3740 } config_params[]={
3741         { "allowed_drive_mask", allow_drives, 0xff },
3742         { "all_drives", allow_drives, 0xff },
3743         { "asus_pci", allow_drives, 0x33 },
3744 
3745         { "daring", daring, 1},
3746 
3747         { "two_fdc", fdc2_adr, 0x370 },
3748         { "one_fdc", fdc2_adr, 0 },
3749 
3750         { "thinkpad", floppy_invert_dcl, 1 },
3751 
3752         { "cmos", set_cmos, 0 },
3753 
3754         { "unexpected_interrupts", unex, 1 },
3755         { "no_unexpected_interrupts", unex, 0 },
3756         { "L40SX", unex, 0 } };
3757 
3758 #define FLOPPY_SETUP
3759 void floppy_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
3760 {
3761         int i;
3762         int param;
3763         if (str)
3764                 for (i=0; i< ARRAY_SIZE(config_params); i++){
3765                         if (strcmp(str,config_params[i].name) == 0){
3766                                 if (ints[0])
3767                                         param = ints[1];
3768                                 else
3769                                         param = config_params[i].def_param;
3770                                 config_params[i].fn(ints,param);
3771                                 return;
3772                         }
3773                 }
3774         if (str) {
3775                 DPRINT1("unknown floppy option [%s]\n", str);
3776                 
3777                 DPRINT("allowed options are:");
3778                 for (i=0; i< ARRAY_SIZE(config_params); i++)
3779                         printk(" %s",config_params[i].name);
3780                 printk("\n");
3781         } else
3782                 DPRINT("botched floppy option\n");
3783         DPRINT("Read linux/drivers/block/README.fd\n");
3784 }
3785 
3786 int floppy_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3787 {
3788         int i,unit,drive;
3789         int have_no_fdc= -EIO;
3790 
3791         raw_cmd = 0;
3792 
3793         sti();
3794 
3795         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3796                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3797                 return -EBUSY;
3798         }
3799 
3800         for (i=0; i<256; i++)
3801                 if (TYPE(i))
3802                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3803                 else
3804                         floppy_sizes[i] = MAX_DISK_SIZE;
3805 
3806         blk_size[MAJOR_NR] = floppy_sizes;
3807         blksize_size[MAJOR_NR] = floppy_blocksizes;
3808         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3809         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3810         config_types();
3811 
3812         for (i = 0; i < N_FDC; i++) {
3813                 fdc = i;
3814                 CLEARSTRUCT(FDCS);
3815                 FDCS->dtr = -1;
3816                 FDCS->dor = 0x4;
3817         }
3818 
3819         fdc_state[0].address = FDC1;
3820 #if N_FDC > 1
3821         fdc_state[1].address = FDC2;
3822 #endif
3823 
3824         if (floppy_grab_irq_and_dma()){
3825                 unregister_blkdev(MAJOR_NR,"fd");
3826                 return -EBUSY;
3827         }
3828 
3829         /* initialise drive state */
3830         for (drive = 0; drive < N_DRIVE; drive++) {
3831                 CLEARSTRUCT(UDRS);
3832                 CLEARSTRUCT(UDRWE);
3833                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3834                 floppy_track_buffer = NULL;
3835                 max_buffer_sectors = 0;
3836         }
3837 
3838         for (i = 0; i < N_FDC; i++) {
3839                 fdc = i;
3840                 FDCS->driver_version = FD_DRIVER_VERSION;
3841                 for (unit=0; unit<4; unit++)
3842                         FDCS->track[unit] = 0;
3843                 if (FDCS->address == -1)
3844                         continue;
3845                 FDCS->rawcmd = 2;
3846                 if (user_reset_fdc(-1,FD_RESET_ALWAYS,0)){
3847                         FDCS->address = -1;
3848                         continue;
3849                 }
3850                 /* Try to determine the floppy controller type */
3851                 FDCS->version = get_fdc_version();
3852                 if (FDCS->version == FDC_NONE){
3853                         FDCS->address = -1;
3854                         continue;
3855                 }
3856 
3857                 request_region(FDCS->address, 6, "floppy");
3858                 request_region(FDCS->address+7, 1, "floppy DIR");
3859                 /* address + 6 is reserved, and may be taken by IDE.
3860                  * Unfortunately, Adaptec doesn't know this :-(, */
3861 
3862                 have_no_fdc = 0;
3863                 /* Not all FDCs seem to be able to handle the version command
3864                  * properly, so force a reset for the standard FDC clones,
3865                  * to avoid interrupt garbage.
3866                  */
3867                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3868                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3869         }
3870         fdc=0;
3871         del_timer(&fd_timeout);
3872         current_drive = 0;
3873         floppy_release_irq_and_dma();
3874         initialising=0;
3875         if (have_no_fdc) {
3876                 DPRINT("no floppy controllers found\n");
3877                 unregister_blkdev(MAJOR_NR,"fd");
3878         } else
3879                 virtual_dma_init();
3880         return have_no_fdc;
3881 }
3882 
3883 static int floppy_grab_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3884 {
3885         int i;
3886         cli();
3887         if (usage_count++){
3888                 sti();
3889                 return 0;
3890         }
3891         sti();
3892         MOD_INC_USE_COUNT;
3893         for (i=0; i< N_FDC; i++){
3894                 if (FDCS->address != -1){
3895                         fdc = i;
3896                         reset_fdc_info(1);
3897                         fd_outb(FDCS->dor, FD_DOR);
3898                 }
3899         }
3900         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3901 
3902         if (fd_request_irq()) {
3903                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3904                         FLOPPY_IRQ);
3905                 return -1;
3906         }
3907         if (fd_request_dma()) {
3908                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3909                         FLOPPY_DMA);
3910                 fd_free_irq();
3911                 return -1;
3912         }
3913         for (fdc = 0; fdc < N_FDC; fdc++)
3914                 if (FDCS->address != -1)
3915                         fd_outb(FDCS->dor, FD_DOR);
3916         fdc = 0;
3917         fd_enable_irq();
3918         return 0;
3919 }
3920 
3921 static void floppy_release_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3922 {
3923 #ifdef FLOPPY_SANITY_CHECK
3924         int drive;
3925 #endif
3926         long tmpsize;
3927         void *tmpaddr;
3928 
3929         cli();
3930         if (--usage_count){
3931                 sti();
3932                 return;
3933         }
3934         sti();
3935         MOD_DEC_USE_COUNT;
3936         fd_disable_dma();
3937         fd_free_dma();
3938         fd_disable_irq();
3939         fd_free_irq();
3940 
3941         set_dor(0, ~0, 8);
3942 #if N_FDC > 1
3943         set_dor(1, ~8, 0);
3944 #endif
3945         floppy_enable_hlt();
3946 
3947         if (floppy_track_buffer && max_buffer_sectors) {
3948                 tmpsize = max_buffer_sectors*1024;
3949                 tmpaddr = (void *)floppy_track_buffer;
3950                 floppy_track_buffer = 0;
3951                 max_buffer_sectors = 0;
3952                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
3953         }
3954 
3955 #ifdef FLOPPY_SANITY_CHECK
3956         for (drive=0; drive < N_FDC * 4; drive++)
3957                 if (motor_off_timer[drive].next)
3958                         printk("motor off timer %d still active\n", drive);
3959 
3960         if (fd_timeout.next)
3961                 printk("floppy timer still active:%s\n", timeout_message);
3962         if (fd_timer.next)
3963                 printk("auxiliary floppy timer still active\n");
3964         if (floppy_tq.sync)
3965                 printk("task queue still active\n");
3966 #endif
3967 }
3968 
3969 
3970 #ifdef MODULE
3971 
3972 extern char *get_options(char *str, int *ints);
3973 
3974 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /* [previous][next][first][last][top][bottom][index][help] */
3975 {
3976         int i;
3977         char c;
3978         int j;
3979         int match;
3980         char buffer[100];
3981         int ints[11];
3982         int length = strlen(pattern)+1;
3983 
3984         match=0;
3985         j=1;
3986 
3987         for (i=current->mm->env_start; i< current->mm->env_end; i ++){
3988                 c= get_fs_byte(i);
3989                 if (match){
3990                         if (j==99)
3991                                 c='\0';
3992                         buffer[j] = c;
3993                         if (!c || c == ' ' || c == '\t'){
3994                                 if (j){
3995                                         buffer[j] = '\0';
3996                                         setup(get_options(buffer,ints),ints);
3997                                 }
3998                                 j=0;
3999                         } else
4000                                 j++;
4001                         if (!c)
4002                                 break;
4003                         continue;
4004                 }
4005                 if ((!j && !c) || (j && c == pattern[j-1]))
4006                         j++;
4007                 else
4008                         j=0;
4009                 if (j==length){
4010                         match=1;
4011                         j=0;
4012                 }
4013         }
4014 }
4015 
4016 
4017 #ifdef __cplusplus
4018 extern "C" {
4019 #endif
4020 int init_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4021 {
4022         printk("inserting floppy driver for %s\n", kernel_version);
4023                 
4024         mod_setup("floppy=", floppy_setup);
4025                 
4026         return floppy_init();
4027 }
4028 
4029 void cleanup_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4030 {
4031         int fdc;
4032                 
4033         for (fdc=0; fdc<2; fdc++)
4034                 if (FDCS->address != -1){
4035                         release_region(FDCS->address, 6);
4036                         release_region(FDCS->address+7, 1);
4037         }
4038                 
4039         unregister_blkdev(MAJOR_NR, "fd");
4040 
4041         blk_dev[MAJOR_NR].request_fn = 0;
4042 }
4043 
4044 #ifdef __cplusplus
4045 }
4046 #endif
4047 
4048 #endif
/* [previous][next][first][last][top][bottom][index][help] */