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 #include <linux/utsname.h>
 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 ITYPE(x) (((x)>>2) & 0x1f)
 211 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 212 #define UNIT(x) ((x) & 0x03)            /* drive on fdc */
 213 #define FDC(x) (((x) & 0x04) >> 2)  /* fdc of drive */
 214 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
 215                                 /* reverse mapping from unit and fdc to drive */
 216 #define DP (&drive_params[current_drive])
 217 #define DRS (&drive_state[current_drive])
 218 #define DRWE (&write_errors[current_drive])
 219 #define FDCS (&fdc_state[fdc])
 220 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 221 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 222 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 223 
 224 #define UDP (&drive_params[drive])
 225 #define UDRS (&drive_state[drive])
 226 #define UDRWE (&write_errors[drive])
 227 #define UFDCS (&fdc_state[FDC(drive)])
 228 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 229 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 230 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 231 
 232 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 233 
 234 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 235 
 236 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 237 
 238 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 239 
 240 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 241 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 242 
 243 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
 244 
 245 /* read/write */
 246 #define COMMAND raw_cmd->cmd[0]
 247 #define DR_SELECT raw_cmd->cmd[1]
 248 #define TRACK raw_cmd->cmd[2]
 249 #define HEAD raw_cmd->cmd[3]
 250 #define SECTOR raw_cmd->cmd[4]
 251 #define SIZECODE raw_cmd->cmd[5]
 252 #define SECT_PER_TRACK raw_cmd->cmd[6]
 253 #define GAP raw_cmd->cmd[7]
 254 #define SIZECODE2 raw_cmd->cmd[8]
 255 #define NR_RW 9
 256 
 257 /* format */
 258 #define F_SIZECODE raw_cmd->cmd[2]
 259 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 260 #define F_GAP raw_cmd->cmd[4]
 261 #define F_FILL raw_cmd->cmd[5]
 262 #define NR_F 6
 263 
 264 /*
 265  * Maximum disk size (in kilobytes). This default is used whenever the
 266  * current disk size is unknown.
 267  * [Now it is rather a minimum]
 268  */
 269 #define MAX_DISK_SIZE 2 /* 3984*/
 270 
 271 #define K_64    0x10000         /* 64KB */
 272 
 273 /*
 274  * globals used by 'result()'
 275  */
 276 #define MAX_REPLIES 17
 277 static unsigned char reply_buffer[MAX_REPLIES];
 278 static int inr; /* size of reply buffer, when called from interrupt */
 279 #define ST0 (reply_buffer[0])
 280 #define ST1 (reply_buffer[1])
 281 #define ST2 (reply_buffer[2])
 282 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 283 #define R_TRACK (reply_buffer[3])
 284 #define R_HEAD (reply_buffer[4])
 285 #define R_SECTOR (reply_buffer[5])
 286 #define R_SIZECODE (reply_buffer[6])
 287 
 288 #define SEL_DLY (2*HZ/100)
 289 
 290 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 291 /*
 292  * this struct defines the different floppy drive types.
 293  */
 294 static struct {
 295         struct floppy_drive_params params;
 296         const char *name; /* name printed while booting */
 297 } default_drive_params[]= {
 298 /* NOTE: the time values in jiffies should be in msec!
 299  CMOS drive type
 300   |     Maximum data rate supported by drive type
 301   |     |   Head load time, msec
 302   |     |   |   Head unload time, msec (not used)
 303   |     |   |   |     Step rate interval, usec
 304   |     |   |   |     |       Time needed for spinup time (jiffies)
 305   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 306   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 307   |     |   |   |     |       |      |   |     Select delay
 308   |     |   |   |     |       |      |   |     |     RPS
 309   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 310   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 311   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 312   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 313 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 314       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 315 
 316 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 317       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 318 
 319 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 320       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 321 
 322 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 323       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 324 
 325 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 326       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 327 
 328 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 329       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 330 
 331 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 332       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 333 /*    |  --autodetected formats---    |      |      |
 334  *    read_track                      |      |    Name printed when booting
 335  *                                    |     Native format
 336  *                  Frequency of disk change checks */
 337 };
 338 
 339 static struct floppy_drive_params drive_params[N_DRIVE];
 340 static struct floppy_drive_struct drive_state[N_DRIVE];
 341 static struct floppy_write_errors write_errors[N_DRIVE];
 342 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 343 
 344 /*
 345  * This struct defines the different floppy types.
 346  *
 347  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 348  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 349  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 350  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 351  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 352  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 353  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 354  * 'stretch' should probably be renamed to something more general, like
 355  * 'options'.  Other parameters should be self-explanatory (see also
 356  * setfdprm(8)).
 357  */
 358 static struct floppy_struct floppy_type[32] = {
 359         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 360         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 361         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 362         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 363         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 364         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 365         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 366         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 367         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 368         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 369 
 370         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 371         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 372         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 373         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 374         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 375         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 376         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 377         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 378         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 379         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 380 
 381         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 382         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 383         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 384         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 385         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 386         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 387         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 388         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 389         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 390 
 391         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 392         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 393         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 394 };
 395 
 396 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 397 #define SECTSIZE (_FD_SECTSIZE(*floppy))
 398 
 399 /* Auto-detection: Disk type used until the next media change occurs. */
 400 static struct floppy_struct *current_type[N_DRIVE] = {
 401         NULL, NULL, NULL, NULL,
 402         NULL, NULL, NULL, NULL
 403 };
 404 
 405 /*
 406  * User-provided type information. current_type points to
 407  * the respective entry of this array.
 408  */
 409 static struct floppy_struct user_params[N_DRIVE];
 410 
 411 static int floppy_sizes[256];
 412 static int floppy_blocksizes[256] = { 0, };
 413 
 414 /*
 415  * The driver is trying to determine the correct media format
 416  * while probing is set. rw_interrupt() clears it after a
 417  * successful access.
 418  */
 419 static int probing = 0;
 420 
 421 /* Synchronization of FDC access. */
 422 #define FD_COMMAND_NONE -1
 423 #define FD_COMMAND_ERROR 2
 424 #define FD_COMMAND_OKAY 3
 425 
 426 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 427 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 428 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 429 #define CALL(x) if ((x) == -EINTR) return -EINTR
 430 #define ECALL(x) if ((ret = (x))) return ret;
 431 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 432 #define WAIT(x) _WAIT((x),interruptible)
 433 #define IWAIT(x) _WAIT((x),1)
 434 
 435 /* Errors during formatting are counted here. */
 436 static int format_errors;
 437 
 438 /* Format request descriptor. */
 439 static struct format_descr format_req;
 440 
 441 /*
 442  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 443  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 444  * H is head unload time (1=16ms, 2=32ms, etc)
 445  */
 446 
 447 /*
 448  * Track buffer
 449  * Because these are written to by the DMA controller, they must
 450  * not contain a 64k byte boundary crossing, or data will be
 451  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 452  * Note that you must not change the sizes below without updating head.S.
 453  */
 454 static char *floppy_track_buffer=0;
 455 static int max_buffer_sectors=0;
 456 
 457 static int *errors;
 458 typedef void (*done_f)(int);
 459 static struct cont_t {
 460         void (*interrupt)(void); /* this is called after the interrupt of the
 461                                   * main command */
 462         void (*redo)(void); /* this is called to retry the operation */
 463         void (*error)(void); /* this is called to tally an error */
 464         done_f done; /* this is called to say if the operation has 
 465                       * succeeded/failed */
 466 } *cont=NULL;
 467 
 468 static void floppy_ready(void);
 469 static void floppy_start(void);
 470 static void process_fd_request(void);
 471 static void recalibrate_floppy(void);
 472 static void floppy_shutdown(void);
 473 
 474 static int floppy_grab_irq_and_dma(void);
 475 static void floppy_release_irq_and_dma(void);
 476 
 477 /*
 478  * The "reset" variable should be tested whenever an interrupt is scheduled,
 479  * after the commands have been sent. This is to ensure that the driver doesn't
 480  * get wedged when the interrupt doesn't come because of a failed command.
 481  * reset doesn't need to be tested before sending commands, because
 482  * output_byte is automatically disabled when reset is set.
 483  */
 484 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
 485 static void reset_fdc(void);
 486 
 487 /*
 488  * These are global variables, as that's the easiest way to give
 489  * information to interrupts. They are the data used for the current
 490  * request.
 491  */
 492 #define NO_TRACK -1
 493 #define NEED_1_RECAL -2
 494 #define NEED_2_RECAL -3
 495 
 496 /* */
 497 static int usage_count = 0;
 498 
 499 
 500 /* buffer related variables */
 501 static int buffer_track = -1;
 502 static int buffer_drive = -1;
 503 static int buffer_min = -1;
 504 static int buffer_max = -1;
 505 
 506 /* fdc related variables, should end up in a struct */
 507 static struct floppy_fdc_state fdc_state[N_FDC];
 508 static int fdc; /* current fdc */
 509 
 510 static struct floppy_struct * floppy = floppy_type;
 511 static unsigned char current_drive = 0;
 512 static long current_count_sectors = 0;
 513 static unsigned char sector_t; /* sector in track */
 514 
 515 #ifdef DEBUGT
 516 static long unsigned debugtimer;
 517 #endif
 518 
 519 /*
 520  * Debugging
 521  * =========
 522  */
 523 static inline void set_debugt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 524 {
 525 #ifdef DEBUGT
 526         debugtimer = jiffies;
 527 #endif
 528 }
 529 
 530 static inline void debugt(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 531 {
 532 #ifdef DEBUGT
 533         if (DP->flags & DEBUGT)
 534                 printk("%s dtime=%lu\n", message, jiffies-debugtimer);
 535 #endif
 536 }
 537 
 538 typedef void (*timeout_fn)(unsigned long);
 539 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 540                                        (timeout_fn) floppy_shutdown };
 541 
 542 static const char *timeout_message;
 543 
 544 #ifdef FLOPPY_SANITY_CHECK
 545 static void is_alive(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 546 {
 547         /* this routine checks whether the floppy driver is "alive" */
 548         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 549                 DPRINT1("timeout handler died: %s\n",message);
 550         }
 551 }
 552 #endif
 553 
 554 #ifdef FLOPPY_SANITY_CHECK
 555 
 556 #define OLOGSIZE 20
 557 
 558 static void (*lasthandler)(void) = NULL;
 559 static int interruptjiffies=0;
 560 static int resultjiffies=0;
 561 static int resultsize=0;
 562 static int lastredo=0;
 563 
 564 static struct output_log {
 565         unsigned char data;
 566         unsigned char status;
 567         unsigned long jiffies;
 568 } output_log[OLOGSIZE];
 569 
 570 static int output_log_pos=0;
 571 #endif
 572 
 573 #define CURRENTD -1
 574 #define MAXTIMEOUT -2
 575 
 576 static void reschedule_timeout(int drive, const char *message, int marg)
     /* [previous][next][first][last][top][bottom][index][help] */
 577 {
 578         if (drive == CURRENTD)
 579                 drive = current_drive;
 580         del_timer(&fd_timeout);
 581         if (drive < 0 || drive > N_DRIVE) {
 582                 fd_timeout.expires = jiffies + 20*HZ;
 583                 drive=0;
 584         } else
 585                 fd_timeout.expires = jiffies + UDP->timeout;
 586         add_timer(&fd_timeout);
 587         if (UDP->flags & FD_DEBUG){
 588                 DPRINT("reschedule timeout ");
 589                 printk(message, marg);
 590                 printk("\n");
 591         }
 592         timeout_message = message;
 593 }
 594 
 595 static int maximum(int a, int b)
     /* [previous][next][first][last][top][bottom][index][help] */
 596 {
 597         if(a > b)
 598                 return a;
 599         else
 600                 return b;
 601 }
 602 #define INFBOUND(a,b) (a)=maximum((a),(b));
 603 
 604 static int minimum(int a, int b)
     /* [previous][next][first][last][top][bottom][index][help] */
 605 {
 606         if(a < b)
 607                 return a;
 608         else
 609                 return b;
 610 }
 611 #define SUPBOUND(a,b) (a)=minimum((a),(b));
 612 
 613 
 614 /*
 615  * Bottom half floppy driver.
 616  * ==========================
 617  *
 618  * This part of the file contains the code talking directly to the hardware,
 619  * and also the main service loop (seek-configure-spinup-command)
 620  */
 621 
 622 /*
 623  * disk change.
 624  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 625  * and the last_checked date.
 626  *
 627  * last_checked is the date of the last check which showed 'no disk change'
 628  * FD_DISK_CHANGE is set under two conditions:
 629  * 1. The floppy has been changed after some i/o to that floppy already
 630  *    took place.
 631  * 2. No floppy disk is in the drive. This is done in order to ensure that
 632  *    requests are quickly flushed in case there is no disk in the drive. It
 633  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 634  *    the drive.
 635  *
 636  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 637  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 638  *  each seek. If a disk is present, the disk change line should also be
 639  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 640  *  change line is set, this means either that no disk is in the drive, or
 641  *  that it has been removed since the last seek.
 642  *
 643  * This means that we really have a third possibility too:
 644  *  The floppy has been changed after the last seek.
 645  */
 646 
 647 static int disk_change(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 648 {
 649         int fdc=FDC(drive);
 650 #ifdef FLOPPY_SANITY_CHECK
 651         if (jiffies < UDP->select_delay + UDRS->select_date)
 652                 DPRINT("WARNING disk change called early\n");
 653         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 654            (FDCS->dor & 3) != UNIT(drive) ||
 655            fdc != FDC(drive)){
 656                 DPRINT("probing disk change on unselected drive\n");
 657                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 658                         FDCS->dor);
 659         }
 660 #endif
 661 
 662 #ifdef DCL_DEBUG
 663         if (UDP->flags & FD_DEBUG){
 664                 DPRINT1("checking disk change line for drive %d\n",drive);
 665                 DPRINT1("jiffies=%ld\n", jiffies);
 666                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 667                 DPRINT1("flags=%x\n",UDRS->flags);
 668         }
 669 #endif
 670         if (UDP->flags & FD_BROKEN_DCL)
 671                 return UTESTF(FD_DISK_CHANGED);
 672         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 673                 USETF(FD_VERIFY); /* verify write protection */
 674                 if (UDRS->maxblock){
 675                         /* mark it changed */
 676                         USETF(FD_DISK_CHANGED);
 677 
 678                         /* invalidate its geometry */
 679                         if (UDRS->keep_data >= 0) {
 680                                 if ((UDP->flags & FTD_MSG) &&
 681                                     current_type[drive] != NULL)
 682                                         DPRINT("Disk type is undefined after "
 683                                                "disk change\n");
 684                                 current_type[drive] = NULL;
 685                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 686                         }
 687                 }
 688                 /*USETF(FD_DISK_NEWCHANGE);*/
 689                 return 1;
 690         } else {
 691                 UDRS->last_checked=jiffies;
 692                 UCLEARF(FD_DISK_NEWCHANGE);
 693         }
 694         return 0;
 695 }
 696 
 697 static inline int is_selected(int dor, int unit)
     /* [previous][next][first][last][top][bottom][index][help] */
 698 {
 699         return ((dor  & (0x10 << unit)) && (dor &3) == unit);
 700 }
 701 
 702 static int set_dor(int fdc, char mask, char data)
     /* [previous][next][first][last][top][bottom][index][help] */
 703 {
 704         register unsigned char drive, unit, newdor,olddor;
 705 
 706         if (FDCS->address == -1)
 707                 return -1;
 708 
 709         olddor = FDCS->dor;
 710         newdor =  (olddor & mask) | data;
 711         if (newdor != olddor){
 712                 unit = olddor & 0x3;
 713                 if (is_selected(olddor, unit) && !is_selected(newdor,unit)){
 714                         drive = REVDRIVE(fdc,unit);
 715 #ifdef DCL_DEBUG
 716                         if (UDP->flags & FD_DEBUG){
 717                                 DPRINT("calling disk change from set_dor\n");
 718                         }
 719 #endif
 720                         disk_change(drive);
 721                 }
 722                 FDCS->dor = newdor;
 723                 fd_outb(newdor, FD_DOR);
 724 
 725                 unit = newdor & 0x3;
 726                 if (!is_selected(olddor, unit) && is_selected(newdor,unit)){
 727                         drive = REVDRIVE(fdc,unit);
 728                         UDRS->select_date = jiffies;
 729                 }
 730         }
 731         if (newdor & 0xf0)
 732                 floppy_grab_irq_and_dma();
 733         if (olddor & 0xf0)
 734                 floppy_release_irq_and_dma();
 735         return olddor;
 736 }
 737 
 738 static void twaddle(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 739 {
 740         if (DP->select_delay)
 741                 return;
 742         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 743         fd_outb(FDCS->dor, FD_DOR);
 744         DRS->select_date = jiffies;
 745 }
 746 
 747 /* reset all driver information about the current fdc. This is needed after
 748  * a reset, and after a raw command. */
 749 static void reset_fdc_info(int mode)
     /* [previous][next][first][last][top][bottom][index][help] */
 750 {
 751         int drive;
 752 
 753         FDCS->spec1 = FDCS->spec2 = -1;
 754         FDCS->need_configure = 1;
 755         FDCS->perp_mode = 1;
 756         FDCS->rawcmd = 0;
 757         for (drive = 0; drive < N_DRIVE; drive++)
 758                 if (FDC(drive) == fdc &&
 759                     (mode || UDRS->track != NEED_1_RECAL))
 760                         UDRS->track = NEED_2_RECAL;
 761 }
 762 
 763 /* selects the fdc and drive, and enables the fdc's input/dma. */
 764 static void set_fdc(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 765 {
 766         if (drive >= 0 && drive < N_DRIVE){
 767                 fdc = FDC(drive);
 768                 current_drive = drive;
 769         }
 770         if (fdc != 1 && fdc != 0) {
 771                 printk("bad fdc value\n");
 772                 return;
 773         }
 774         set_dor(fdc,~0,8);
 775         set_dor(1-fdc, ~8, 0);
 776         if (FDCS->rawcmd == 2)
 777                 reset_fdc_info(1);
 778         if (fd_inb(FD_STATUS) != STATUS_READY)
 779                 FDCS->reset = 1;
 780 }
 781 
 782 /* locks the driver */
 783 static int lock_fdc(int drive, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
 784 {
 785         if (!usage_count){
 786                 printk("trying to lock fdc while usage count=0\n");
 787                 return -1;
 788         }
 789         floppy_grab_irq_and_dma();
 790         cli();
 791         while (fdc_busy && NO_SIGNAL)
 792                 interruptible_sleep_on(&fdc_wait);
 793         if (fdc_busy){
 794                 sti();
 795                 return -EINTR;
 796         }
 797         fdc_busy = 1;
 798         sti();
 799         command_status = FD_COMMAND_NONE;
 800         reschedule_timeout(drive, "lock fdc", 0);
 801         set_fdc(drive);
 802         return 0;
 803 }
 804 
 805 #define LOCK_FDC(drive,interruptible) \
 806 if (lock_fdc(drive,interruptible)) return -EINTR;
 807 
 808 
 809 /* unlocks the driver */
 810 static inline void unlock_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 811 {
 812         raw_cmd = 0;
 813         if (!fdc_busy)
 814                 DPRINT("FDC access conflict!\n");
 815 
 816         if (DEVICE_INTR)
 817                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 818                         DEVICE_INTR);
 819         command_status = FD_COMMAND_NONE;
 820         del_timer(&fd_timeout);
 821         cont = NULL;
 822         fdc_busy = 0;
 823         floppy_release_irq_and_dma();
 824         wake_up(&fdc_wait);
 825 }
 826 
 827 /* switches the motor off after a given timeout */
 828 static void motor_off_callback(unsigned long nr)
     /* [previous][next][first][last][top][bottom][index][help] */
 829 {
 830         unsigned char mask = ~(0x10 << UNIT(nr));
 831 
 832         set_dor(FDC(nr), mask, 0);
 833 }
 834 
 835 static struct timer_list motor_off_timer[N_DRIVE] = {
 836         { NULL, NULL, 0, 0, motor_off_callback },
 837         { NULL, NULL, 0, 1, motor_off_callback },
 838         { NULL, NULL, 0, 2, motor_off_callback },
 839         { NULL, NULL, 0, 3, motor_off_callback },
 840         { NULL, NULL, 0, 4, motor_off_callback },
 841         { NULL, NULL, 0, 5, motor_off_callback },
 842         { NULL, NULL, 0, 6, motor_off_callback },
 843         { NULL, NULL, 0, 7, motor_off_callback }
 844 };
 845 
 846 /* schedules motor off */
 847 static void floppy_off(unsigned int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 848 {
 849         unsigned long volatile delta;
 850         register int fdc=FDC(drive);
 851 
 852         if (!(FDCS->dor & (0x10 << UNIT(drive))))
 853                 return;
 854 
 855         del_timer(motor_off_timer+drive);
 856 
 857         /* make spindle stop in a position which minimizes spinup time
 858          * next time */
 859         if (UDP->rps){
 860                 delta = jiffies - UDRS->first_read_date + HZ -
 861                         UDP->spindown_offset;
 862                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
 863                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 864         }
 865         add_timer(motor_off_timer+drive);
 866 }
 867 
 868 /*
 869  * cycle through all N_DRIVE floppy drives, for disk change testing.
 870  * stopping at current drive. This is done before any long operation, to
 871  * be sure to have up to date disk change information.
 872  */
 873 static void scandrives(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 874 {
 875         int i, drive, saved_drive;
 876 
 877         if (DP->select_delay)
 878                 return;
 879 
 880         saved_drive = current_drive;
 881         for (i=0; i < N_DRIVE; i++){
 882                 drive = (saved_drive + i + 1) % N_DRIVE;
 883                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
 884                         continue; /* skip closed drives */
 885                 set_fdc(drive);
 886                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
 887                       (0x10 << UNIT(drive))))
 888                         /* switch the motor off again, if it was off to
 889                          * begin with */
 890                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
 891         }
 892         set_fdc(saved_drive);
 893 }
 894 
 895 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 896 
 897 /* this function makes sure that the disk stays in the drive during the
 898  * transfer */
 899 static void fd_watchdog(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 900 {
 901 #ifdef DCL_DEBUG
 902         if (DP->flags & FD_DEBUG){
 903                 DPRINT("calling disk change from watchdog\n");
 904         }
 905 #endif
 906 
 907         if (disk_change(current_drive)){
 908                 DPRINT("disk removed during i/o\n");
 909                 floppy_shutdown();
 910         } else {
 911                 del_timer(&fd_timer);
 912                 fd_timer.function = (timeout_fn) fd_watchdog;
 913                 fd_timer.expires = jiffies + HZ / 10;
 914                 add_timer(&fd_timer);
 915         }
 916 }
 917 
 918 static void main_command_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 919 {
 920         del_timer(&fd_timer);
 921         cont->interrupt();
 922 }
 923 
 924 /* waits for a delay (spinup or select) to pass */
 925 static int wait_for_completion(int delay, timeout_fn function)
     /* [previous][next][first][last][top][bottom][index][help] */
 926 {
 927         if (FDCS->reset){
 928                 reset_fdc(); /* do the reset during sleep to win time
 929                               * if we don't need to sleep, it's a good
 930                               * occasion anyways */
 931                 return 1;
 932         }
 933 
 934         if (jiffies < delay){
 935                 del_timer(&fd_timer);
 936                 fd_timer.function = function;
 937                 fd_timer.expires = delay;
 938                 add_timer(&fd_timer);
 939                 return 1;
 940         }
 941         return 0;
 942 }
 943 
 944 static int hlt_disabled=0;
 945 static void floppy_disable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 946 {
 947         unsigned long flags;
 948         save_flags(flags);
 949         cli();
 950         if (!hlt_disabled){
 951                 hlt_disabled=1;
 952 #ifdef HAVE_DISABLE_HLT
 953                 disable_hlt();
 954 #endif
 955         }
 956         restore_flags(flags);
 957 }
 958 
 959 static void floppy_enable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 960 {
 961         unsigned long flags;
 962         save_flags(flags);
 963         cli();
 964         if (hlt_disabled){
 965                 hlt_disabled=0;
 966 #ifdef HAVE_DISABLE_HLT
 967                 enable_hlt();
 968 #endif
 969         }
 970         restore_flags(flags);
 971 }
 972 
 973 
 974 static void setup_DMA(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 975 {
 976 #ifdef FLOPPY_SANITY_CHECK
 977         if (raw_cmd->length == 0){
 978                 int i;
 979 
 980                 printk("zero dma transfer size:");
 981                 for (i=0; i < raw_cmd->cmd_count; i++)
 982                         printk("%x,", raw_cmd->cmd[i]);
 983                 printk("\n");
 984                 cont->done(0);
 985                 FDCS->reset = 1;
 986                 return;
 987         }
 988         if ((long) raw_cmd->kernel_data % 512){
 989                 printk("non aligned address: %p\n", raw_cmd->kernel_data);
 990                 cont->done(0);
 991                 FDCS->reset=1;
 992                 return;
 993         }
 994         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
 995                 printk("DMA crossing 64-K boundary %p-%p\n",
 996                        raw_cmd->kernel_data,
 997                        raw_cmd->kernel_data + raw_cmd->length);
 998                 cont->done(0);
 999                 FDCS->reset=1;
1000                 return;
1001         }
1002 #endif
1003         cli();
1004         fd_disable_dma();
1005         fd_clear_dma_ff();
1006         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1007                         DMA_MODE_READ : DMA_MODE_WRITE);
1008         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1009         fd_set_dma_count(raw_cmd->length);
1010         fd_enable_dma();
1011         sti();
1012         floppy_disable_hlt();
1013 }
1014 
1015 /* sends a command byte to the fdc */
1016 static int output_byte(char byte)
     /* [previous][next][first][last][top][bottom][index][help] */
1017 {
1018         int counter;
1019         unsigned char status = 0;
1020         unsigned char rstatus;
1021 
1022         if (FDCS->reset)
1023                 return -1;
1024         for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
1025                 rstatus = fd_inb(FD_STATUS);
1026                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1027                 if (!(status & STATUS_READY))
1028                         continue;
1029                 if (status == STATUS_READY){
1030                         fd_outb(byte,FD_DATA);
1031 
1032 #ifdef FLOPPY_SANITY_CHECK
1033                         output_log[output_log_pos].data = byte;
1034                         output_log[output_log_pos].status = rstatus;
1035                         output_log[output_log_pos].jiffies = jiffies;
1036                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1037 #endif
1038                         return 0;
1039                 } else
1040                         break;
1041         }
1042         FDCS->reset = 1;
1043         if (!initialising)
1044                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1045                         byte, status);
1046         return -1;
1047 }
1048 #define LAST_OUT(x) if (output_byte(x)){ reset_fdc();return;}
1049 
1050 /* gets the response from the fdc */
1051 static int result(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1052 {
1053         int i = 0, counter, status = 0;
1054 
1055         if (FDCS->reset)
1056                 return -1;
1057         for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
1058                 status = fd_inb(FD_STATUS)&
1059                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1060                 if (!(status & STATUS_READY))
1061                         continue;
1062                 if (status == STATUS_READY){
1063 #ifdef FLOPPY_SANITY_CHECK
1064                         resultjiffies = jiffies;
1065                         resultsize = i;
1066 #endif
1067                         return i;
1068                 }
1069                 if (status & STATUS_DMA)
1070                         break;
1071                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1072                         if (i >= MAX_REPLIES) {
1073                                 DPRINT("floppy_stat reply overrun\n");
1074                                 break;
1075                         }
1076                         reply_buffer[i++] = fd_inb(FD_DATA);
1077                 }
1078         }
1079         FDCS->reset = 1;
1080         if (!initialising)
1081                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1082                         status, fdc, i);
1083         return -1;
1084 }
1085 
1086 /* Set perpendicular mode as required, based on data rate, if supported.
1087  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1088  */
1089 static inline void perpendicular_mode(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1090 {
1091         unsigned char perp_mode;
1092 
1093         if (raw_cmd->rate & 0x40){
1094                 switch(raw_cmd->rate & 3){
1095                         case 0:
1096                                 perp_mode=2;
1097                                 break;
1098                         case 3:
1099                                 perp_mode=3;
1100                                 break;
1101                         default:
1102                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1103                                 cont->done(0);
1104                                 FDCS->reset = 1; /* convenient way to return to
1105                                                   * redo without to much hassle (deep
1106                                                   * stack et al. */
1107                                 return;
1108                 }
1109         } else
1110                 perp_mode = 0;
1111 
1112         if (FDCS->perp_mode == perp_mode)
1113                 return;
1114         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1115                 output_byte(FD_PERPENDICULAR);
1116                 output_byte(perp_mode);
1117                 FDCS->perp_mode = perp_mode;
1118         } else if (perp_mode) {
1119                 DPRINT("perpendicular mode not supported by this FDC.\n");
1120         }
1121 } /* perpendicular_mode */
1122 
1123 #define NOMINAL_DTR 500
1124 
1125 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1126  * head load time, and DMA disable flag to values needed by floppy.
1127  *
1128  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1129  * to account for the data rate-based scaling done by the 82072 and 82077
1130  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1131  * 8272a).
1132  *
1133  * Note that changing the data transfer rate has a (probably deleterious)
1134  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1135  * fdc_specify is called again after each data transfer rate
1136  * change.
1137  *
1138  * srt: 1000 to 16000 in microseconds
1139  * hut: 16 to 240 milliseconds
1140  * hlt: 2 to 254 milliseconds
1141  *
1142  * These values are rounded up to the next highest available delay time.
1143  */
1144 static void fdc_specify(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1145 {
1146         unsigned char spec1, spec2;
1147         int srt, hlt, hut;
1148         unsigned long dtr = NOMINAL_DTR;
1149         unsigned long scale_dtr = NOMINAL_DTR;
1150         int hlt_max_code = 0x7f;
1151         int hut_max_code = 0xf;
1152 
1153         if (FDCS->need_configure && FDCS->has_fifo) {
1154                 if (FDCS->reset)
1155                         return;
1156                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1157                 /* TODO: lock this in via LOCK during initialization */
1158                 output_byte(FD_CONFIGURE);
1159                 output_byte(0);
1160                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1161                 output_byte(0);         /* precompensation from track 0 upwards */
1162                 if (FDCS->reset){
1163                         FDCS->has_fifo=0;
1164                         return;
1165                 }
1166                 FDCS->need_configure = 0;
1167                 /*DPRINT("FIFO enabled\n");*/
1168         }
1169 
1170         switch (raw_cmd->rate & 0x03) {
1171                 case 3:
1172                         dtr = 1000;
1173                         break;
1174                 case 1:
1175                         dtr = 300;
1176                         break;
1177                 case 2:
1178                         dtr = 250;
1179                         break;
1180         }
1181 
1182         if (FDCS->version >= FDC_82072) {
1183                 scale_dtr = dtr;
1184                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1185                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1186         }
1187 
1188         /* Convert step rate from microseconds to milliseconds and 4 bits */
1189         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1190         SUPBOUND(srt, 0xf);
1191         INFBOUND(srt, 0);
1192 
1193         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1194         if (hlt < 0x01)
1195                 hlt = 0x01;
1196         else if (hlt > 0x7f)
1197                 hlt = hlt_max_code;
1198 
1199         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1200         if (hut < 0x1)
1201                 hut = 0x1;
1202         else if (hut > 0xf)
1203                 hut = hut_max_code;
1204 
1205         spec1 = (srt << 4) | hut;
1206         spec2 = (hlt << 1);
1207 
1208         /* If these parameters did not change, just return with success */
1209         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1210                 /* Go ahead and set spec1 and spec2 */
1211                 output_byte(FD_SPECIFY);
1212                 output_byte(FDCS->spec1 = spec1);
1213                 output_byte(FDCS->spec2 = spec2);
1214         }
1215 } /* fdc_specify */
1216 
1217 /* Set the FDC's data transfer rate on behalf of the specified drive.
1218  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1219  * of the specify command (i.e. using the fdc_specify function).
1220  */
1221 static int fdc_dtr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1222 {
1223         /* If data rate not already set to desired value, set it. */
1224         if ((raw_cmd->rate & 3) == FDCS->dtr)
1225                 return 0;
1226 
1227         /* Set dtr */
1228         fd_outb(raw_cmd->rate & 3, FD_DCR);
1229 
1230         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1231          * need a stabilization period of several milliseconds to be
1232          * enforced after data rate changes before R/W operations.
1233          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1234          */
1235         FDCS->dtr = raw_cmd->rate & 3;
1236         return(wait_for_completion(jiffies+2*HZ/100,
1237                                    (timeout_fn) floppy_ready));
1238 } /* fdc_dtr */
1239 
1240 static void tell_sector(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1241 {
1242         printk(": track %d, head %d, sector %d, size %d",
1243                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1244 } /* tell_sector */
1245 
1246 
1247 /*
1248  * Ok, this error interpreting routine is called after a
1249  * DMA read/write has succeeded
1250  * or failed, so we check the results, and copy any buffers.
1251  * hhb: Added better error reporting.
1252  * ak: Made this into a separate routine.
1253  */
1254 static int interpret_errors(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1255 {
1256         char bad;
1257 
1258         if (inr!=7) {
1259                 DPRINT("-- FDC reply error");
1260                 FDCS->reset = 1;
1261                 return 1;
1262         }
1263 
1264         /* check IC to find cause of interrupt */
1265         switch (ST0 & ST0_INTR) {
1266                 case 0x40:      /* error occurred during command execution */
1267                         bad = 1;
1268                         if (ST1 & ST1_WP) {
1269                                 DPRINT("Drive is write protected\n");
1270                                 CLEARF(FD_DISK_WRITABLE);
1271                                 cont->done(0);
1272                                 bad = 2;
1273                         } else if (ST1 & ST1_ND) {
1274                                 SETF(FD_NEED_TWADDLE);
1275                         } else if (ST1 & ST1_OR) {
1276                                 if (DP->flags & FTD_MSG)
1277                                         DPRINT("Over/Underrun - retrying\n");
1278                                 bad = 0;
1279                         }else if (*errors >= DP->max_errors.reporting){
1280                                 DPRINT("");
1281                                 if (ST0 & ST0_ECE) {
1282                                         printk("Recalibrate failed!");
1283                                 } else if (ST2 & ST2_CRC) {
1284                                         printk("data CRC error");
1285                                         tell_sector();
1286                                 } else if (ST1 & ST1_CRC) {
1287                                         printk("CRC error");
1288                                         tell_sector();
1289                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1290                                         if (!probing) {
1291                                                 printk("sector not found");
1292                                                 tell_sector();
1293                                         } else
1294                                                 printk("probe failed...");
1295                                 } else if (ST2 & ST2_WC) {      /* seek error */
1296                                         printk("wrong cylinder");
1297                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1298                                         printk("bad cylinder");
1299                                 } else {
1300                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1301                                         tell_sector();
1302                                 }
1303                                 printk("\n");
1304 
1305                         }
1306                         if (ST2 & ST2_WC || ST2 & ST2_BC)
1307                                 /* wrong cylinder => recal */
1308                                 DRS->track = NEED_2_RECAL;
1309                         return bad;
1310                 case 0x80: /* invalid command given */
1311                         DPRINT("Invalid FDC command given!\n");
1312                         cont->done(0);
1313                         return 2;
1314                 case 0xc0:
1315                         DPRINT("Abnormal termination caused by polling\n");
1316                         cont->error();
1317                         return 2;
1318                 default: /* (0) Normal command termination */
1319                         return 0;
1320         }
1321 }
1322 
1323 /*
1324  * This routine is called when everything should be correctly set up
1325  * for the transfer (ie floppy motor is on, the correct floppy is
1326  * selected, and the head is sitting on the right track).
1327  */
1328 static void setup_rw_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1329 {
1330         int i,ready_date,r, flags,dflags;
1331         timeout_fn function;
1332 
1333         flags = raw_cmd->flags;
1334         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1335                 flags |= FD_RAW_INTR;
1336 
1337         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1338                 ready_date = DRS->spinup_date + DP->spinup;
1339                 /* If spinup will take a long time, rerun scandrives
1340                  * again just before spinup completion. Beware that
1341                  * after scandrives, we must again wait for selection.
1342                  */
1343                 if (ready_date > jiffies + DP->select_delay){
1344                         ready_date -= DP->select_delay;
1345                         function = (timeout_fn) floppy_start;
1346                 } else
1347                         function = (timeout_fn) setup_rw_floppy;
1348 
1349                 /* wait until the floppy is spinning fast enough */
1350                 if (wait_for_completion(ready_date,function))
1351                         return;
1352         }
1353         dflags = DRS->flags;
1354 
1355         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1356                 setup_DMA();
1357 
1358         if (flags & FD_RAW_INTR)
1359                 SET_INTR(main_command_interrupt);
1360 
1361         r=0;
1362         for (i=0; i< raw_cmd->cmd_count; i++)
1363                 r|=output_byte(raw_cmd->cmd[i]);
1364 
1365 #ifdef DEBUGT
1366         debugt("rw_command: ");
1367 #endif
1368         if (r){
1369                 reset_fdc();
1370                 return;
1371         }
1372 
1373         if (!(flags & FD_RAW_INTR)){
1374                 inr = result();
1375                 cont->interrupt();
1376         } else if (flags & FD_RAW_NEED_DISK)
1377                 fd_watchdog();
1378 }
1379 
1380 static int blind_seek;
1381 
1382 /*
1383  * This is the routine called after every seek (or recalibrate) interrupt
1384  * from the floppy controller.
1385  */
1386 static void seek_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1387 {
1388 #ifdef DEBUGT
1389         debugt("seek interrupt:");
1390 #endif
1391         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1392                 DPRINT("seek failed\n");
1393                 DRS->track = NEED_2_RECAL;
1394                 cont->error();
1395                 cont->redo();
1396                 return;
1397         }
1398         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1399 #ifdef DCL_DEBUG
1400                 if (DP->flags & FD_DEBUG){
1401                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1402                         DPRINT1("jiffies=%ld\n", jiffies);
1403                 }
1404 #endif
1405                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1406                 DRS->select_date = jiffies;
1407         }
1408         DRS->track = ST1;
1409         floppy_ready();
1410 }
1411 
1412 static void check_wp(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1413 {
1414         if (TESTF(FD_VERIFY)) {
1415                 /* check write protection */
1416                 output_byte(FD_GETSTATUS);
1417                 output_byte(UNIT(current_drive));
1418                 if (result() != 1){
1419                         FDCS->reset = 1;
1420                         return;
1421                 }
1422                 CLEARF(FD_VERIFY);
1423                 CLEARF(FD_NEED_TWADDLE);
1424 #ifdef DCL_DEBUG
1425                 if (DP->flags & FD_DEBUG){
1426                         DPRINT("checking whether disk is write protected\n");
1427                         DPRINT1("wp=%x\n",ST3 & 0x40);
1428                 }
1429 #endif
1430                 if (!(ST3  & 0x40))
1431                         SETF(FD_DISK_WRITABLE);
1432                 else
1433                         CLEARF(FD_DISK_WRITABLE);
1434         }
1435 }
1436 
1437 static void seek_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1438 {
1439         int track;
1440 
1441         blind_seek=0;
1442 
1443 #ifdef DCL_DEBUG
1444         if (DP->flags & FD_DEBUG){
1445                 DPRINT("calling disk change from seek\n");
1446         }
1447 #endif
1448 
1449         if (!TESTF(FD_DISK_NEWCHANGE) &&
1450             disk_change(current_drive) &&
1451             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1452                 /* the media changed flag should be cleared after the seek.
1453                  * If it isn't, this means that there is really no disk in
1454                  * the drive.
1455                  */
1456                 SETF(FD_DISK_CHANGED);
1457                 cont->done(0);
1458                 cont->redo();
1459                 return;
1460         }
1461         if (DRS->track <= NEED_1_RECAL){
1462                 recalibrate_floppy();
1463                 return;
1464         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1465                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1466                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1467                 /* we seek to clear the media-changed condition. Does anybody
1468                  * know a more elegant way, which works on all drives? */
1469                 if (raw_cmd->track)
1470                         track = raw_cmd->track - 1;
1471                 else {
1472                         if (DP->flags & FD_SILENT_DCL_CLEAR){
1473                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1474                                 blind_seek = 1;
1475                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1476                         }
1477                         track = 1;
1478                 }
1479         } else {
1480                 check_wp();
1481                 if (raw_cmd->track != DRS->track &&
1482                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1483                         track = raw_cmd->track;
1484                 else {
1485                         setup_rw_floppy();
1486                         return;
1487                 }
1488         }
1489 
1490         SET_INTR(seek_interrupt);
1491         output_byte(FD_SEEK);
1492         output_byte(UNIT(current_drive));
1493         LAST_OUT(track);
1494 #ifdef DEBUGT
1495         debugt("seek command:");
1496 #endif
1497 }
1498 
1499 static void recal_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1500 {
1501 #ifdef DEBUGT
1502         debugt("recal interrupt:");
1503 #endif
1504         if (inr !=2)
1505                 FDCS->reset = 1;
1506         else if (ST0 & ST0_ECE) {
1507                 switch(DRS->track){
1508                         case NEED_1_RECAL:
1509 #ifdef DEBUGT
1510                                 debugt("recal interrupt need 1 recal:");
1511 #endif
1512                                 /* after a second recalibrate, we still haven't
1513                                  * reached track 0. Probably no drive. Raise an
1514                                  * error, as failing immediately might upset
1515                                  * computers possessed by the Devil :-) */
1516                                 cont->error();
1517                                 cont->redo();
1518                                 return;
1519                         case NEED_2_RECAL:
1520 #ifdef DEBUGT
1521                                 debugt("recal interrupt need 2 recal:");
1522 #endif
1523                                 /* If we already did a recalibrate,
1524                                  * and we are not at track 0, this
1525                                  * means we have moved. (The only way
1526                                  * not to move at recalibration is to
1527                                  * be already at track 0.) Clear the
1528                                  * new change flag */
1529 #ifdef DCL_DEBUG
1530                                 if (DP->flags & FD_DEBUG){
1531                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1532                                 }
1533 #endif
1534 
1535                                 CLEARF(FD_DISK_NEWCHANGE);
1536                                 DRS->select_date = jiffies;
1537                                 /* fall through */
1538                         default:
1539 #ifdef DEBUGT
1540                                 debugt("recal interrupt default:");
1541 #endif
1542                                 /* Recalibrate moves the head by at
1543                                  * most 80 steps. If after one
1544                                  * recalibrate we don't have reached
1545                                  * track 0, this might mean that we
1546                                  * started beyond track 80.  Try
1547                                  * again.  */
1548                                 DRS->track = NEED_1_RECAL;
1549                                 break;
1550                 }
1551         } else
1552                 DRS->track = ST1;
1553         floppy_ready();
1554 }
1555 
1556 /*
1557  * Unexpected interrupt - Print as much debugging info as we can...
1558  * All bets are off...
1559  */
1560 static void unexpected_floppy_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1561 {
1562         int i;
1563         if (initialising)
1564                 return;
1565         if (print_unex){
1566                 DPRINT("unexpected interrupt\n");
1567                 if (inr >= 0)
1568                         for (i=0; i<inr; i++)
1569                                 printk("%d %x\n", i, reply_buffer[i]);
1570         }
1571         while(1){
1572                 output_byte(FD_SENSEI);
1573                 inr=result();
1574                 if (inr != 2)
1575                         break;
1576                 if (print_unex){
1577                         printk("sensei\n");
1578                         for (i=0; i<inr; i++)
1579                                 printk("%d %x\n", i, reply_buffer[i]);
1580                 }
1581         }
1582         FDCS->reset = 1;
1583 }
1584 
1585 static struct tq_struct floppy_tq =
1586 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1587 
1588 /* interrupt handler */
1589 static void floppy_interrupt(int irq, void *dev_id, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
1590 {
1591         void (*handler)(void) = DEVICE_INTR;
1592 
1593         lasthandler = handler;
1594         interruptjiffies = jiffies;
1595 
1596         floppy_enable_hlt();
1597         CLEAR_INTR;
1598         if (fdc >= N_FDC || FDCS->address == -1){
1599                 /* we don't even know which FDC is the culprit */
1600                 printk("DOR0=%x\n", fdc_state[0].dor);
1601                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1602                 printk("handler=%p\n", handler);
1603                 is_alive("bizarre fdc");
1604                 return;
1605         }
1606         inr = result();
1607         if (!handler){
1608                 unexpected_floppy_interrupt();
1609                 is_alive("unexpected");
1610                 return;
1611         }
1612         if (inr == 0){
1613                 do {
1614                         output_byte(FD_SENSEI);
1615                         inr = result();
1616                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1617         }
1618         floppy_tq.routine = (void *)(void *) handler;
1619         queue_task_irq(&floppy_tq, &tq_timer);
1620         is_alive("normal interrupt end");
1621 }
1622 
1623 static void recalibrate_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1624 {
1625 #ifdef DEBUGT
1626         debugt("recalibrate floppy:");
1627 #endif
1628         SET_INTR(recal_interrupt);
1629         output_byte(FD_RECALIBRATE);
1630         LAST_OUT(UNIT(current_drive));
1631 }
1632 
1633 /*
1634  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1635  */
1636 static void reset_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1637 {
1638 #ifdef DEBUGT
1639         debugt("reset interrupt:");
1640 #endif
1641         /* fdc_specify();          reprogram fdc */
1642         result();               /* get the status ready for set_fdc */
1643         if (FDCS->reset) {
1644                 printk("reset set in interrupt, calling %p\n", cont->error);
1645                 cont->error(); /* a reset just after a reset. BAD! */
1646         }
1647         cont->redo();
1648 }
1649 
1650 /*
1651  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1652  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1653  */
1654 static void reset_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1655 {
1656         SET_INTR(reset_interrupt);
1657         FDCS->reset = 0;
1658         reset_fdc_info(0);
1659         if (FDCS->version >= FDC_82077)
1660                 fd_outb(0x80 | (FDCS->dtr &3), FD_STATUS);
1661         else {
1662                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1663                 udelay(FD_RESET_DELAY);
1664                 outb(FDCS->dor, FD_DOR);
1665         }
1666 }
1667 
1668 static void empty(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1669 {
1670 }
1671 
1672 void show_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1673 {
1674         int i;
1675 
1676         printk("\n");
1677         printk("floppy driver state\n");
1678         printk("-------------------\n");
1679         printk("now=%ld last interrupt=%d last called handler=%p\n",
1680                jiffies, interruptjiffies, lasthandler);
1681 
1682 
1683 #ifdef FLOPPY_SANITY_CHECK
1684         printk("timeout_message=%s\n", timeout_message);
1685         printk("last output bytes:\n");
1686         for (i=0; i < OLOGSIZE; i++)
1687                 printk("%2x %2x %ld\n",
1688                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1689                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1690                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1691         printk("last result at %d\n", resultjiffies);
1692         printk("last redo_fd_request at %d\n", lastredo);
1693         for (i=0; i<resultsize; i++){
1694                 printk("%2x ", reply_buffer[i]);
1695         }
1696         printk("\n");
1697 #endif
1698 
1699         printk("status=%x\n", fd_inb(FD_STATUS));
1700         printk("fdc_busy=%d\n", fdc_busy);
1701         if (DEVICE_INTR)
1702                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1703         if (floppy_tq.sync)
1704                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1705         if (fd_timer.prev)
1706                 printk("fd_timer.function=%p\n", fd_timer.function);
1707         if (fd_timeout.prev){
1708                 printk("timer_table=%p\n",fd_timeout.function);
1709                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1710                 printk("now=%ld\n",jiffies);
1711         }
1712         printk("cont=%p\n", cont);
1713         printk("CURRENT=%p\n", CURRENT);
1714         printk("command_status=%d\n", command_status);
1715         printk("\n");
1716 }
1717 
1718 static void floppy_shutdown(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1719 {
1720         if (!initialising)
1721                 show_floppy();
1722         CLEAR_INTR;
1723         floppy_tq.routine = (void *)(void *) empty;
1724         del_timer(&fd_timer);
1725         sti();
1726 
1727         floppy_enable_hlt();
1728         fd_disable_dma();
1729         /* avoid dma going to a random drive after shutdown */
1730 
1731         if (!initialising)
1732                 DPRINT("floppy timeout\n");
1733         FDCS->reset = 1;
1734         if (cont){
1735                 cont->done(0);
1736                 cont->redo(); /* this will recall reset when needed */
1737         } else {
1738                 printk("no cont in shutdown!\n");
1739                 process_fd_request();
1740         }
1741         is_alive("floppy shutdown");
1742 }
1743 /*typedef void (*timeout_fn)(unsigned long);*/
1744 
1745 /* start motor, check media-changed condition and write protection */
1746 static int start_motor(void (*function)(void) )
     /* [previous][next][first][last][top][bottom][index][help] */
1747 {
1748         int mask, data;
1749 
1750         mask = 0xfc;
1751         data = UNIT(current_drive);
1752         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1753                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))){
1754                         set_debugt();
1755                         /* no read since this drive is running */
1756                         DRS->first_read_date = 0;
1757                         /* note motor start time if motor is not yet running */
1758                         DRS->spinup_date = jiffies;
1759                         data |= (0x10 << UNIT(current_drive));
1760                 }
1761         } else
1762                 if (FDCS->dor & (0x10 << UNIT(current_drive)))
1763                         mask &= ~(0x10 << UNIT(current_drive));
1764 
1765         /* starts motor and selects floppy */
1766         del_timer(motor_off_timer + current_drive);
1767         set_dor(fdc, mask, data);
1768 
1769         /* wait_for_completion also schedules reset if needed. */
1770         return(wait_for_completion(DRS->select_date+DP->select_delay,
1771                                    (timeout_fn) function));
1772 }
1773 
1774 static void floppy_ready(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1775 {
1776         CHECK_RESET;
1777         if (start_motor(floppy_ready)) return;
1778         if (fdc_dtr()) return;
1779 
1780 #ifdef DCL_DEBUG
1781         if (DP->flags & FD_DEBUG){
1782                 DPRINT("calling disk change from floppy_ready\n");
1783         }
1784 #endif
1785 
1786         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1787            disk_change(current_drive) &&
1788            !DP->select_delay)
1789                 twaddle(); /* this clears the dcl on certain drive/controller
1790                             * combinations */
1791 
1792         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1793                 perpendicular_mode();
1794                 fdc_specify(); /* must be done here because of hut, hlt ... */
1795                 seek_floppy();
1796         } else
1797                 setup_rw_floppy();
1798 }
1799 
1800 static void floppy_start(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1801 {
1802         reschedule_timeout(CURRENTD, "floppy start", 0);
1803 
1804         scandrives();
1805 #ifdef DCL_DEBUG
1806         if (DP->flags & FD_DEBUG){
1807                 DPRINT("setting NEWCHANGE in floppy_start\n");
1808         }
1809 #endif
1810         SETF(FD_DISK_NEWCHANGE);
1811         floppy_ready();
1812 }
1813 
1814 /*
1815  * ========================================================================
1816  * here ends the bottom half. Exported routines are:
1817  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1818  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1819  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1820  * and set_dor.
1821  * ========================================================================
1822  */
1823 /*
1824  * General purpose continuations.
1825  * ==============================
1826  */
1827 
1828 static void do_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1829 {
1830         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1831         cont = 0;
1832         command_status += 2;
1833         wake_up(&command_done);
1834 }
1835 
1836 static struct cont_t wakeup_cont={
1837         empty,
1838         do_wakeup,
1839         empty,
1840         (done_f)empty
1841 };
1842 
1843 static int wait_til_done(void (*handler)(void), int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
1844 {
1845         int ret;
1846 
1847         floppy_tq.routine = (void *)(void *) handler;
1848         queue_task(&floppy_tq, &tq_timer);
1849 
1850         cli();
1851         while(command_status < 2 && NO_SIGNAL){
1852                 is_alive("wait_til_done");
1853                 if (interruptible)
1854                         interruptible_sleep_on(&command_done);
1855                 else
1856                         sleep_on(&command_done);
1857         }
1858         if (command_status < 2){
1859                 floppy_shutdown();
1860                 sti();
1861                 process_fd_request();
1862                 return -EINTR;
1863         }
1864         sti();
1865 
1866         if (FDCS->reset)
1867                 command_status = FD_COMMAND_ERROR;
1868         if (command_status == FD_COMMAND_OKAY)
1869                 ret=0;
1870         else
1871                 ret=-EIO;
1872         command_status = FD_COMMAND_NONE;
1873         return ret;
1874 }
1875 
1876 static void generic_done(int result)
     /* [previous][next][first][last][top][bottom][index][help] */
1877 {
1878         command_status = result;
1879         cont = &wakeup_cont;
1880 }
1881 
1882 static void generic_success(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1883 {
1884         cont->done(1);
1885 }
1886 
1887 static void generic_failure(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1888 {
1889         cont->done(0);
1890 }
1891 
1892 static void success_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1893 {
1894         generic_success();
1895         cont->redo();
1896 }
1897 
1898 
1899 /*
1900  * formatting and rw support.
1901  * ==========================
1902  */
1903 
1904 static int next_valid_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1905 {
1906         int probed_format;
1907 
1908         probed_format = DRS->probed_format;
1909         while(1){
1910                 if (probed_format >= 8 ||
1911                      !DP->autodetect[probed_format]){
1912                         DRS->probed_format = 0;
1913                         return 1;
1914                 }
1915                 if (floppy_type[DP->autodetect[probed_format]].sect){
1916                         DRS->probed_format = probed_format;
1917                         return 0;
1918                 }
1919                 probed_format++;
1920         }
1921 }
1922 
1923 static void bad_flp_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1924 {
1925         if (probing){
1926                 DRS->probed_format++;
1927                 if (!next_valid_format())
1928                         return;
1929         }
1930         (*errors)++;
1931         INFBOUND(DRWE->badness, *errors);
1932         if (*errors > DP->max_errors.abort)
1933                 cont->done(0);
1934         if (*errors > DP->max_errors.reset)
1935                 FDCS->reset = 1;
1936         else if (*errors > DP->max_errors.recal)
1937                 DRS->track = NEED_2_RECAL;
1938 }
1939 
1940 static void set_floppy(kdev_t device)
     /* [previous][next][first][last][top][bottom][index][help] */
1941 {
1942         if (TYPE(device))
1943                 floppy = TYPE(device) + floppy_type;
1944         else
1945                 floppy = current_type[ DRIVE(device) ];
1946 }
1947 
1948 /*
1949  * formatting and support.
1950  * =======================
1951  */
1952 static void format_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1953 {
1954         switch (interpret_errors()){
1955                 case 1:
1956                         cont->error();
1957                 case 2:
1958                         break;
1959                 case 0:
1960                         cont->done(1);
1961         }
1962         cont->redo();
1963 }
1964 
1965 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
1966 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
1967 #define CT(x) ((x) | 0x40)
1968 static void setup_format_params(int track)
     /* [previous][next][first][last][top][bottom][index][help] */
1969 {
1970         struct fparm {
1971                 unsigned char track,head,sect,size;
1972         } *here = (struct fparm *)floppy_track_buffer;
1973         int il,n;
1974         int count,head_shift,track_shift;
1975 
1976         raw_cmd = &default_raw_cmd;
1977         raw_cmd->track = track;
1978 
1979         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1980                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1981         raw_cmd->rate = floppy->rate & 0x43;
1982         raw_cmd->cmd_count = NR_F;
1983         COMMAND = FM_MODE(floppy,FD_FORMAT);
1984         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
1985         F_SIZECODE = FD_SIZECODE(floppy);
1986         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1987         F_GAP = floppy->fmt_gap;
1988         F_FILL = FD_FILL_BYTE;
1989 
1990         raw_cmd->kernel_data = floppy_track_buffer;
1991         raw_cmd->length = 4 * F_SECT_PER_TRACK;
1992 
1993         /* allow for about 30ms for data transport per track */
1994         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1995 
1996         /* a ``cylinder'' is two tracks plus a little stepping time */
1997         track_shift = 2 * head_shift + 3;
1998 
1999         /* position of logical sector 1 on this track */
2000         n = (track_shift * format_req.track + head_shift * format_req.head)
2001                 % F_SECT_PER_TRACK;
2002 
2003         /* determine interleave */
2004         il = 1;
2005         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2006                 il++;
2007 
2008         /* initialize field */
2009         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2010                 here[count].track = format_req.track;
2011                 here[count].head = format_req.head;
2012                 here[count].sect = 0;
2013                 here[count].size = F_SIZECODE;
2014         }
2015         /* place logical sectors */
2016         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2017                 here[n].sect = count;
2018                 n = (n+il) % F_SECT_PER_TRACK;
2019                 if (here[n].sect) { /* sector busy, find next free sector */
2020                         ++n;
2021                         if (n>= F_SECT_PER_TRACK) {
2022                                 n-=F_SECT_PER_TRACK;
2023                                 while (here[n].sect) ++n;
2024                         }
2025                 }
2026         }
2027 }
2028 
2029 static void redo_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2030 {
2031         buffer_track = -1;
2032         setup_format_params(format_req.track << STRETCH(floppy));
2033         floppy_start();
2034 #ifdef DEBUGT
2035         debugt("queue format request");
2036 #endif
2037 }
2038 
2039 static struct cont_t format_cont={
2040         format_interrupt,
2041         redo_format,
2042         bad_flp_intr,
2043         generic_done };
2044 
2045 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /* [previous][next][first][last][top][bottom][index][help] */
2046 {
2047         int ret;
2048         int drive=DRIVE(device);
2049 
2050         LOCK_FDC(drive,1);
2051         set_floppy(device);
2052         if (!floppy ||
2053             floppy->track > DP->tracks ||
2054             tmp_format_req->track >= floppy->track ||
2055             tmp_format_req->head >= floppy->head ||
2056             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2057             !floppy->fmt_gap) {
2058                 process_fd_request();
2059                 return -EINVAL;
2060         }
2061         format_req = *tmp_format_req;
2062         format_errors = 0;
2063         cont = &format_cont;
2064         errors = &format_errors;
2065         IWAIT(redo_format);
2066         process_fd_request();
2067         return ret;
2068 }
2069 
2070 /*
2071  * Buffer read/write and support
2072  * =============================
2073  */
2074 
2075 /* new request_done. Can handle physical sectors which are smaller than a
2076  * logical buffer */
2077 static void request_done(int uptodate)
     /* [previous][next][first][last][top][bottom][index][help] */
2078 {
2079         int block;
2080 
2081         probing = 0;
2082         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2083 
2084         if (!CURRENT){
2085                 DPRINT("request list destroyed in floppy request done\n");
2086                 return;
2087         }
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 & 0x43;
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                 unsigned long dma_limit;
2444                 int direct, indirect;
2445 
2446                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2447                         sector_t;
2448 
2449                 /*
2450                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2451                  * on a 64 bit machine!
2452                  */
2453                 max_size = buffer_chain_size();
2454                 dma_limit = (MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer)) >> 9;
2455                 if ((unsigned long) max_size > dma_limit) {
2456                         max_size = dma_limit;
2457                 }
2458                 /* 64 kb boundaries */
2459                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2460                         max_size = (K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2461                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2462                 /*
2463                  * We try to read tracks, but if we get too many errors, we
2464                  * go back to reading just one sector at a time.
2465                  *
2466                  * This means we should be able to read a sector even if there
2467                  * are other bad sectors on this track.
2468                  */
2469                 if (!direct ||
2470                     (indirect * 2 > direct * 3 &&
2471                      *errors < DP->max_errors.read_track &&
2472                      /*!TESTF(FD_NEED_TWADDLE) &&*/
2473                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2474                         max_size = CURRENT->nr_sectors;
2475                 } else {
2476                         raw_cmd->kernel_data = CURRENT->buffer;
2477                         raw_cmd->length = current_count_sectors << 9;
2478                         if (raw_cmd->length == 0){
2479                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2480                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2481                                         indirect, direct, sector_t);
2482                                 return 0;
2483                         }
2484                         return 2;
2485                 }
2486         }
2487 
2488         if (CT(COMMAND) == FD_READ)
2489                 max_size = max_sector; /* unbounded */
2490 
2491         /* claim buffer track if needed */
2492         if (buffer_track != raw_cmd->track ||  /* bad track */
2493             buffer_drive !=current_drive || /* bad drive */
2494             sector_t > buffer_max ||
2495             sector_t < buffer_min ||
2496             ((CT(COMMAND) == FD_READ ||
2497               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize))&&
2498              max_sector > 2 * max_buffer_sectors + buffer_min &&
2499              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2500             /* not enough space */){
2501                 buffer_track = -1;
2502                 buffer_drive = current_drive;
2503                 buffer_max = buffer_min = aligned_sector_t;
2504         }
2505         raw_cmd->kernel_data = floppy_track_buffer + 
2506                 ((aligned_sector_t-buffer_min)<<9);
2507 
2508         if (CT(COMMAND) == FD_WRITE){
2509                 /* copy write buffer to track buffer.
2510                  * if we get here, we know that the write
2511                  * is either aligned or the data already in the buffer
2512                  * (buffer will be overwritten) */
2513 #ifdef FLOPPY_SANITY_CHECK
2514                 if (sector_t != aligned_sector_t && buffer_track == -1)
2515                         DPRINT("internal error offset !=0 on write\n");
2516 #endif
2517                 buffer_track = raw_cmd->track;
2518                 buffer_drive = current_drive;
2519                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2520         } else
2521                 transfer_size(ssize, max_sector,
2522                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2523 
2524         /* round up current_count_sectors to get dma xfer size */
2525         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2526         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2527         raw_cmd->length <<= 9;
2528 #ifdef FLOPPY_SANITY_CHECK
2529         if ((raw_cmd->length < current_count_sectors << 9) ||
2530             (raw_cmd->kernel_data != CURRENT->buffer &&
2531              CT(COMMAND) == FD_WRITE &&
2532              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2533               aligned_sector_t < buffer_min)) ||
2534             raw_cmd->length % (128 << SIZECODE) ||
2535             raw_cmd->length <= 0 || current_count_sectors <= 0){
2536                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2537                         raw_cmd->length, current_count_sectors);
2538                 if (raw_cmd->kernel_data != CURRENT->buffer)
2539                         printk("addr=%d, length=%ld\n",
2540                                (int) ((raw_cmd->kernel_data - 
2541                                        floppy_track_buffer) >> 9),
2542                                current_count_sectors);
2543                 printk("st=%d ast=%d mse=%d msi=%d\n",
2544                        sector_t, aligned_sector_t, max_sector, max_size);
2545                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2546                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2547                        COMMAND, SECTOR, HEAD, TRACK);
2548                 printk("buffer drive=%d\n", buffer_drive);
2549                 printk("buffer track=%d\n", buffer_track);
2550                 printk("buffer_min=%d\n", buffer_min);
2551                 printk("buffer_max=%d\n", buffer_max);
2552                 return 0;
2553         }
2554 
2555         if (raw_cmd->kernel_data != CURRENT->buffer){
2556                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2557                     current_count_sectors < 0 ||
2558                     raw_cmd->length < 0 ||
2559                     raw_cmd->kernel_data + raw_cmd->length >
2560                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2561                         DPRINT("buffer overrun in schedule dma\n");
2562                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2563                                sector_t, buffer_min,
2564                                raw_cmd->length >> 9);
2565                         printk("current_count_sectors=%ld\n",
2566                                current_count_sectors);
2567                         if (CT(COMMAND) == FD_READ)
2568                                 printk("read\n");
2569                         if (CT(COMMAND) == FD_READ)
2570                                 printk("write\n");
2571                         return 0;
2572                 }
2573         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2574                    current_count_sectors > CURRENT->nr_sectors){
2575                 DPRINT("buffer overrun in direct transfer\n");
2576                 return 0;
2577         } else if (raw_cmd->length < current_count_sectors << 9){
2578                 DPRINT("more sectors than bytes\n");
2579                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2580                 printk("sectors=%ld\n", current_count_sectors);
2581         }
2582         if (raw_cmd->length == 0){
2583                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2584                 return 0;
2585         }
2586 #endif
2587         return 2;
2588 }
2589 
2590 static void redo_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2591 {
2592 #define REPEAT {request_done(0); continue; }
2593         kdev_t device;
2594         int tmp;
2595 
2596         lastredo = jiffies;
2597         if (current_drive < N_DRIVE)
2598                 floppy_off(current_drive);
2599 
2600         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2601                 DPRINT("current not active!\n");
2602                 return;
2603         }
2604 
2605         while(1){
2606                 if (!CURRENT) {
2607                         CLEAR_INTR;
2608                         unlock_fdc();
2609                         return;
2610                 }
2611                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2612                         panic(DEVICE_NAME ": request list destroyed");
2613                 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
2614                         panic(DEVICE_NAME ": block not locked");
2615 
2616                 device = CURRENT->rq_dev;
2617                 set_fdc(DRIVE(device));
2618                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2619 
2620                 set_floppy(device);
2621                 raw_cmd = & default_raw_cmd;
2622                 raw_cmd->flags = 0;
2623                 if (start_motor(redo_fd_request)) return;
2624                 if (test_bit(current_drive, &fake_change) ||
2625                    TESTF(FD_DISK_CHANGED)){
2626                         DPRINT("disk absent or changed during operation\n");
2627                         REPEAT;
2628                 }
2629                 if (!floppy) { /* Autodetection */
2630                         if (!probing){
2631                                 DRS->probed_format = 0;
2632                                 if (next_valid_format()){
2633                                         DPRINT("no autodetectable formats\n");
2634                                         floppy = NULL;
2635                                         REPEAT;
2636                                 }
2637                         }
2638                         probing = 1;
2639                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2640                 } else
2641                         probing = 0;
2642                 errors = & (CURRENT->errors);
2643                 tmp = make_raw_rw_request();
2644                 if (tmp < 2){
2645                         request_done(tmp);
2646                         continue;
2647                 }
2648 
2649                 if (TESTF(FD_NEED_TWADDLE))
2650                         twaddle();
2651                 floppy_tq.routine = (void *)(void *) floppy_start;
2652                 queue_task(&floppy_tq, &tq_timer);
2653 #ifdef DEBUGT
2654                 debugt("queue fd request");
2655 #endif
2656                 return;
2657         }
2658 #undef REPEAT
2659 }
2660 
2661 static struct cont_t rw_cont={
2662         rw_interrupt,
2663         redo_fd_request,
2664         bad_flp_intr,
2665         request_done };
2666 
2667 static struct tq_struct request_tq =
2668 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2669 
2670 static void process_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2671 {
2672         cont = &rw_cont;
2673         queue_task(&request_tq, &tq_timer);
2674 }
2675 
2676 static void do_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2677 {
2678         if (fdc_busy){
2679                 /* fdc busy, this new request will be treated when the
2680                    current one is done */
2681                 is_alive("do fd request, old request running");
2682                 return;
2683         }
2684         lock_fdc(MAXTIMEOUT,0);
2685         process_fd_request();
2686         is_alive("do fd request");
2687 }
2688 
2689 static struct cont_t poll_cont={
2690         success_and_wakeup,
2691         floppy_ready,
2692         generic_failure,
2693         generic_done };
2694 
2695 static int poll_drive(int interruptible, int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2696 {
2697         int ret;
2698         /* no auto-sense, just clear dcl */
2699         raw_cmd = &default_raw_cmd;
2700         raw_cmd->flags= flag;
2701         raw_cmd->track=0;
2702         raw_cmd->cmd_count=0;
2703         cont = &poll_cont;
2704 #ifdef DCL_DEBUG
2705         if (DP->flags & FD_DEBUG){
2706                 DPRINT("setting NEWCHANGE in poll_drive\n");
2707         }
2708 #endif
2709         SETF(FD_DISK_NEWCHANGE);
2710         WAIT(floppy_ready);
2711         return ret;
2712 }
2713 
2714 /*
2715  * User triggered reset
2716  * ====================
2717  */
2718 
2719 static void reset_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2720 {
2721         printk("weird, reset interrupt called\n");
2722 }
2723 
2724 static struct cont_t reset_cont={
2725         reset_intr,
2726         success_and_wakeup,
2727         generic_failure,
2728         generic_done };
2729 
2730 static int user_reset_fdc(int drive, int arg, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
2731 {
2732         int ret;
2733 
2734         ret=0;
2735         LOCK_FDC(drive,interruptible);
2736         if (arg == FD_RESET_ALWAYS)
2737                 FDCS->reset=1;
2738         if (FDCS->reset){
2739                 cont = &reset_cont;
2740                 WAIT(reset_fdc);
2741         }
2742         process_fd_request();
2743         return ret;
2744 }
2745 
2746 /*
2747  * Misc Ioctl's and support
2748  * ========================
2749  */
2750 static int fd_copyout(void *param, const void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2751 {
2752         int ret;
2753 
2754         ECALL(verify_area(VERIFY_WRITE,param,size));
2755         fd_cacheflush(address, size); /* is this necessary ??? */
2756         /* Ralf: Yes; only the l2 cache is completly chipset
2757            controlled */
2758         memcpy_tofs(param,(void *) address, size);
2759         return 0;
2760 }
2761 
2762 static int fd_copyin(void *param, void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2763 {
2764         int ret;
2765 
2766         ECALL(verify_area(VERIFY_READ,param,size));
2767         memcpy_fromfs((void *) address, param, size);
2768         return 0;
2769 }
2770 
2771 #define COPYOUT(x) ECALL(fd_copyout((void *)param, &(x), sizeof(x)))
2772 #define COPYIN(x) ECALL(fd_copyin((void *)param, &(x), sizeof(x)))
2773 
2774 static inline const char *drive_name(int type, int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
2775 {
2776         struct floppy_struct *floppy;
2777 
2778         if (type)
2779                 floppy = floppy_type + type;
2780         else {
2781                 if (UDP->native_format)
2782                         floppy = floppy_type + UDP->native_format;
2783                 else
2784                         return "(null)";
2785         }
2786         if (floppy->name)
2787                 return floppy->name;
2788         else
2789                 return "(null)";
2790 }
2791 
2792 
2793 /* raw commands */
2794 static void raw_cmd_done(int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2795 {
2796         int i;
2797 
2798         if (!flag) {
2799                 raw_cmd->flags = FD_RAW_FAILURE;
2800                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2801         } else {
2802                 raw_cmd->reply_count = inr;
2803                 for (i=0; i< raw_cmd->reply_count; i++)
2804                         raw_cmd->reply[i] = reply_buffer[i];
2805 
2806                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE))
2807                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2808                 
2809                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2810                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2811                         raw_cmd->flags |= FD_RAW_FAILURE;
2812 
2813                 if (disk_change(current_drive))
2814                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2815                 else
2816                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2817                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2818                         motor_off_callback(current_drive);
2819 
2820                 if (raw_cmd->next &&
2821                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2822                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2823                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2824                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2825                         raw_cmd = raw_cmd->next;
2826                         return;
2827                 }
2828         }
2829         generic_done(flag);
2830 }
2831 
2832 
2833 static struct cont_t raw_cmd_cont={
2834         success_and_wakeup,
2835         floppy_start,
2836         generic_failure,
2837         raw_cmd_done
2838 };
2839 
2840 static inline int raw_cmd_copyout(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2841                                   struct floppy_raw_cmd *ptr)
2842 {
2843         struct old_floppy_raw_cmd old_raw_cmd;
2844         int ret;
2845 
2846         while(ptr) {
2847                 if (cmd == OLDFDRAWCMD) {
2848                         old_raw_cmd.flags = ptr->flags;
2849                         old_raw_cmd.data = ptr->data;
2850                         old_raw_cmd.length = ptr->length;
2851                         old_raw_cmd.rate = ptr->rate;
2852                         old_raw_cmd.reply_count = ptr->reply_count;
2853                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2854                         COPYOUT(old_raw_cmd);
2855                         param += sizeof(old_raw_cmd);
2856                 } else {
2857                         COPYOUT(*ptr);
2858                         param += sizeof(struct floppy_raw_cmd);
2859                 }
2860 
2861                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2862                         if (ptr->length>=0 && ptr->length<=ptr->buffer_length)
2863                                 ECALL(fd_copyout(ptr->data, 
2864                                                  ptr->kernel_data, 
2865                                                  ptr->buffer_length - 
2866                                                  ptr->length));
2867                 }
2868                 ptr = ptr->next;
2869         }
2870         return 0;
2871 }
2872 
2873 
2874 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /* [previous][next][first][last][top][bottom][index][help] */
2875 {
2876         struct floppy_raw_cmd *next,*this;
2877 
2878         this = *ptr;
2879         *ptr = 0;
2880         while(this) {
2881                 if (this->buffer_length) {
2882                         free_pages((unsigned long)this->kernel_data,
2883                                    __get_order(this->buffer_length));
2884                         this->buffer_length = 0;
2885                 }
2886                 next = this->next;
2887                 kfree(this);
2888                 this = next;
2889         }
2890 }
2891 
2892 
2893 static inline int raw_cmd_copyin(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2894                                  struct floppy_raw_cmd **rcmd)
2895 {
2896         struct floppy_raw_cmd *ptr;
2897         struct old_floppy_raw_cmd old_raw_cmd;
2898         int ret;
2899         int i;
2900         
2901         *rcmd = 0;
2902         while(1) {
2903                 ptr = (struct floppy_raw_cmd *) 
2904                         kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
2905                 if (!ptr)
2906                         return -ENOMEM;
2907                 *rcmd = ptr;
2908                 if (cmd == OLDFDRAWCMD){
2909                         COPYIN(old_raw_cmd);
2910                         ptr->flags = old_raw_cmd.flags;
2911                         ptr->data = old_raw_cmd.data;
2912                         ptr->length = old_raw_cmd.length;
2913                         ptr->rate = old_raw_cmd.rate;
2914                         ptr->cmd_count = old_raw_cmd.cmd_count;
2915                         ptr->track = old_raw_cmd.track;
2916                         ptr->phys_length = 0;
2917                         ptr->next = 0;
2918                         ptr->buffer_length = 0;
2919                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
2920                         param += sizeof(struct old_floppy_raw_cmd);
2921                         if (ptr->cmd_count > 9)
2922                                 return -EINVAL;
2923                 } else {
2924                         COPYIN(*ptr);
2925                         ptr->next = 0;
2926                         ptr->buffer_length = 0;
2927                         param += sizeof(struct floppy_raw_cmd);
2928                         if (ptr->cmd_count > 16)
2929                                 return -EINVAL;
2930                 }
2931 
2932                 for (i=0; i< 16; i++)
2933                         ptr->reply[i] = 0;
2934                 ptr->resultcode = 0;
2935                 ptr->kernel_data = 0;
2936 
2937                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
2938                         if (ptr->length <= 0)
2939                                 return -EINVAL;
2940                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
2941                         if (!ptr->kernel_data)
2942                                 return -ENOMEM;
2943                         ptr->buffer_length = ptr->length;
2944                 }
2945                 if ( ptr->flags & FD_RAW_READ )
2946                     ECALL( verify_area( VERIFY_WRITE, ptr->data, 
2947                                         ptr->length ));
2948                 if (ptr->flags & FD_RAW_WRITE)
2949                         ECALL(fd_copyin(ptr->data, ptr->kernel_data, 
2950                                         ptr->length));
2951                 rcmd = & (ptr->next);
2952                 if (!(ptr->flags & FD_RAW_MORE))
2953                         return 0;
2954                 ptr->rate &= 0x43;
2955         }
2956 }
2957 
2958 
2959 static int raw_cmd_ioctl(int cmd, void *param)
     /* [previous][next][first][last][top][bottom][index][help] */
2960 {
2961         int drive, ret, ret2;
2962         struct floppy_raw_cmd *my_raw_cmd;
2963 
2964         if (FDCS->rawcmd <= 1)
2965                 FDCS->rawcmd = 1;
2966         for (drive= 0; drive < N_DRIVE; drive++){
2967                 if (FDC(drive) != fdc)
2968                         continue;
2969                 if (drive == current_drive){
2970                         if (UDRS->fd_ref > 1){
2971                                 FDCS->rawcmd = 2;
2972                                 break;
2973                         }
2974                 } else if (UDRS->fd_ref){
2975                         FDCS->rawcmd = 2;
2976                         break;
2977                 }
2978         }
2979 
2980         if (FDCS->reset)
2981                 return -EIO;
2982 
2983         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
2984         if (ret) {
2985                 raw_cmd_free(&my_raw_cmd);
2986                 return ret;
2987         }
2988 
2989         raw_cmd = my_raw_cmd;
2990         cont = &raw_cmd_cont;
2991         ret=wait_til_done(floppy_start,1);
2992 #ifdef DCL_DEBUG
2993         if (DP->flags & FD_DEBUG){
2994                 DPRINT("calling disk change from raw_cmd ioctl\n");
2995         }
2996 #endif
2997 
2998         if (ret != -EINTR && FDCS->reset)
2999                 ret = -EIO;
3000 
3001         DRS->track = NO_TRACK;
3002 
3003         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3004         if (!ret)
3005                 ret = ret2;
3006         raw_cmd_free(&my_raw_cmd);
3007         return ret;
3008 }
3009 
3010 static int invalidate_drive(kdev_t rdev)
     /* [previous][next][first][last][top][bottom][index][help] */
3011 {
3012         /* invalidate the buffer track to force a reread */
3013         set_bit(DRIVE(rdev), &fake_change);
3014         process_fd_request();
3015         check_disk_change(rdev);
3016         return 0;
3017 }
3018 
3019 
3020 static inline void clear_write_error(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
3021 {
3022         CLEARSTRUCT(UDRWE);
3023 }
3024 
3025 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
     /* [previous][next][first][last][top][bottom][index][help] */
3026                                int drive, int type, kdev_t device)
3027 {
3028         int cnt;
3029 
3030         /* sanity checking for parameters.*/
3031         if (g->sect <= 0 ||
3032             g->head <= 0 ||
3033             g->track <= 0 ||
3034             g->track > UDP->tracks>>STRETCH(g) ||
3035             /* check if reserved bits are set */
3036             (g->stretch&~(FD_STRETCH|FD_SWAPSIDES)) != 0)
3037                 return -EINVAL;
3038         if (type){
3039                 if (!suser())
3040                         return -EPERM;
3041                 LOCK_FDC(drive,1);
3042                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3043                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3044                             drive_state[cnt].fd_ref)
3045                                 set_bit(drive, &fake_change);
3046                 }
3047                 floppy_type[type] = *g;
3048                 floppy_type[type].name="user format";
3049                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3050                         floppy_sizes[cnt]= floppy_sizes[cnt+0x80]=
3051                                 floppy_type[type].size>>1;
3052                 process_fd_request();
3053                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3054                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3055                             drive_state[cnt].fd_ref)
3056                                 check_disk_change(
3057                                         MKDEV(FLOPPY_MAJOR,
3058                                               drive_state[cnt].fd_device));
3059                 }
3060         } else {
3061                 LOCK_FDC(drive,1);
3062                 if (cmd != FDDEFPRM)
3063                         /* notice a disk change immediately, else
3064                          * we loose our settings immediately*/
3065                         CALL(poll_drive(1,0));
3066                 user_params[drive] = *g;
3067                 if (buffer_drive == drive)
3068                         SUPBOUND(buffer_max, user_params[drive].sect);
3069                 current_type[drive] = &user_params[drive];
3070                 floppy_sizes[drive] = user_params[drive].size >> 1;
3071                 if (cmd == FDDEFPRM)
3072                         DRS->keep_data = -1;
3073                 else
3074                         DRS->keep_data = 1;
3075                 /* invalidation. Invalidate only when needed, i.e.
3076                  * when there are already sectors in the buffer cache
3077                  * whose number will change. This is useful, because
3078                  * mtools often changes the geometry of the disk after
3079                  * looking at the boot block */
3080                 if (DRS->maxblock > user_params[drive].sect || DRS->maxtrack)
3081                         invalidate_drive(device);
3082                 else
3083                         process_fd_request();
3084         }
3085         return 0;
3086 }
3087 
3088 /* handle obsolete ioctl's */
3089 static struct translation_entry {
3090     int newcmd;
3091     int oldcmd;
3092     int oldsize; /* size of 0x00xx-style ioctl. Reflects old structures, thus
3093                   * use numeric values. NO SIZEOFS */
3094 } translation_table[]= {
3095     {FDCLRPRM,           0,  0},
3096     {FDSETPRM,           1, 28},
3097     {FDDEFPRM,           2, 28},
3098     {FDGETPRM,           3, 28},
3099     {FDMSGON,            4,  0},
3100     {FDMSGOFF,           5,  0},
3101     {FDFMTBEG,           6,  0},
3102     {FDFMTTRK,           7, 12},
3103     {FDFMTEND,           8,  0},
3104     {FDSETEMSGTRESH,    10,  0},
3105     {FDFLUSH,           11,  0},
3106     {FDSETMAXERRS,      12, 20},
3107     {OLDFDRAWCMD,       30,  0},
3108     {FDGETMAXERRS,      14, 20},
3109     {FDGETDRVTYP,       16, 16},
3110     {FDSETDRVPRM,       20, 88},
3111     {FDGETDRVPRM,       21, 88},
3112     {FDGETDRVSTAT,      22, 52},
3113     {FDPOLLDRVSTAT,     23, 52},
3114     {FDRESET,           24,  0},
3115     {FDGETFDCSTAT,      25, 40},
3116     {FDWERRORCLR,       27,  0},
3117     {FDWERRORGET,       28, 24},
3118     {FDRAWCMD,           0,  0},
3119     {FDTWADDLE,         40,  0} };
3120 
3121 static inline int normalize_0x02xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3122 {
3123         int i;
3124 
3125         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3126                 if ((*cmd & 0xffff) == (translation_table[i].newcmd & 0xffff)){
3127                         *size = _IOC_SIZE(*cmd);
3128                         *cmd = translation_table[i].newcmd;
3129                         if (*size > _IOC_SIZE(*cmd)) {
3130                                 printk("ioctl not yet supported\n");
3131                                 return -EFAULT;
3132                         }
3133                         return 0;
3134                 }
3135         }
3136         return -EINVAL;
3137 }
3138 
3139 static inline int xlate_0x00xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3140 {
3141         int i;
3142         /* old ioctls' for kernels <= 1.3.33 */
3143         /* When the next even release will come around, we'll start
3144          * warning against these.
3145          * When the next odd release will come around, we'll fail with
3146          * -EINVAL */
3147         if(strcmp(system_utsname.version, "1.4.0") >= 0)
3148                 printk("obsolete floppy ioctl %x\n", *cmd);
3149         if((system_utsname.version[0] == '1' &&
3150             strcmp(system_utsname.version, "1.5.0") >= 0) ||
3151            (system_utsname.version[0] >= '2' &&
3152             strcmp(system_utsname.version, "2.1.0") >= 0))
3153                 return -EINVAL;
3154         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3155                 if (*cmd == translation_table[i].oldcmd) {
3156                         *size = translation_table[i].oldsize;
3157                         *cmd = translation_table[i].newcmd;
3158                         return 0;
3159                 }
3160         }
3161         return -EINVAL;
3162 }
3163 
3164 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /* [previous][next][first][last][top][bottom][index][help] */
3165                     unsigned long param)
3166 {
3167 #define IOCTL_MODE_BIT 8
3168 #define OPEN_WRITE_BIT 16
3169 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3170 #define OUT(c,x) case c: outparam = (const char *) (x); break
3171 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3172 
3173         int i,drive,type;
3174         kdev_t device;
3175         int ret;
3176         int size;
3177         union inparam {
3178                 struct floppy_struct g; /* geometry */
3179                 struct format_descr f;
3180                 struct floppy_max_errors max_errors;
3181                 struct floppy_drive_params dp;
3182         } inparam; /* parameters coming from user space */
3183         const char *outparam; /* parameters passed back to user space */
3184 
3185         device = inode->i_rdev;
3186         switch (cmd) {
3187                 RO_IOCTLS(device,param);
3188         }
3189         type = TYPE(device);
3190         drive = DRIVE(device);
3191 
3192         /* convert the old style command into a new style command */
3193         if ((cmd & 0xff00) == 0x0200) {
3194                 ECALL(normalize_0x02xx_ioctl(&cmd, &size));
3195         } else if ((cmd & 0xff00) == 0x0000) {
3196                 ECALL(xlate_0x00xx_ioctl(&cmd, &size));
3197         } else
3198                 return -EINVAL;
3199 
3200         /* permission checks */
3201         if (((cmd & 0x80) && !suser()) ||
3202              ((cmd & 0x40) && !IOCTL_ALLOWED))
3203                 return -EPERM;
3204 
3205         /* verify writability of result, and fail early */
3206         if (_IOC_DIR(cmd) & _IOC_READ)
3207                 ECALL(verify_area(VERIFY_WRITE,(void *) param, size));
3208                 
3209         /* copyin */
3210         CLEARSTRUCT(&inparam);
3211         if (_IOC_DIR(cmd) & _IOC_WRITE)
3212                 ECALL(fd_copyin((void *)param, &inparam, size))
3213 
3214         switch (cmd) {
3215                 case FDCLRPRM:
3216                         LOCK_FDC(drive,1);
3217                         current_type[drive] = NULL;
3218                         floppy_sizes[drive] = MAX_DISK_SIZE;
3219                         UDRS->keep_data = 0;
3220                         return invalidate_drive(device);
3221                 case FDSETPRM:
3222                 case FDDEFPRM:
3223                         return set_geometry(cmd, & inparam.g,
3224                                             drive, type, device);
3225                 case FDGETPRM:
3226                         if (type)
3227                                 outparam = (char *) &floppy_type[type];
3228                         else 
3229                                 outparam = (char *) current_type[drive];
3230                         if(!outparam)
3231                                 return -ENODEV;
3232                         break;
3233 
3234                 case FDMSGON:
3235                         UDP->flags |= FTD_MSG;
3236                         return 0;
3237                 case FDMSGOFF:
3238                         UDP->flags &= ~FTD_MSG;
3239                         return 0;
3240 
3241                 case FDFMTBEG:
3242                         LOCK_FDC(drive,1);
3243                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3244                         ret = UDRS->flags;
3245                         process_fd_request();
3246                         if(ret & FD_VERIFY)
3247                                 return -ENODEV;
3248                         if(!(ret & FD_DISK_WRITABLE))
3249                                 return -EROFS;
3250                         return 0;
3251                 case FDFMTTRK:
3252                         if (UDRS->fd_ref != 1)
3253                                 return -EBUSY;
3254                         return do_format(device, &inparam.f);
3255                 case FDFMTEND:
3256                 case FDFLUSH:
3257                         LOCK_FDC(drive,1);
3258                         return invalidate_drive(device);
3259 
3260                 case FDSETEMSGTRESH:
3261                         UDP->max_errors.reporting =
3262                                 (unsigned short) (param & 0x0f);
3263                         return 0;
3264                 OUT(FDGETMAXERRS, &UDP->max_errors);
3265                 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3266 
3267                 case FDGETDRVTYP:
3268                         outparam = drive_name(type,drive);
3269                         SUPBOUND(size,strlen(outparam)+1);
3270                         break;
3271 
3272                 IN(FDSETDRVPRM, UDP, dp);
3273                 OUT(FDGETDRVPRM, UDP);
3274 
3275                 case FDPOLLDRVSTAT:
3276                         LOCK_FDC(drive,1);
3277                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3278                         process_fd_request();
3279                         /* fall through */
3280                 OUT(FDGETDRVSTAT, UDRS);
3281 
3282                 case FDRESET:
3283                         return user_reset_fdc(drive, (int)param, 1);
3284 
3285                 OUT(FDGETFDCSTAT,UFDCS);
3286 
3287                 case FDWERRORCLR:
3288                         CLEARSTRUCT(UDRWE);
3289                         return 0;
3290                 OUT(FDWERRORGET,UDRWE);
3291 
3292                 case OLDFDRAWCMD:
3293                 case FDRAWCMD:
3294                         if (type)
3295                                 return -EINVAL;
3296                         LOCK_FDC(drive,1);
3297                         set_floppy(device);
3298                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3299                         process_fd_request();
3300                         return i;
3301 
3302                 case FDTWADDLE:
3303                         LOCK_FDC(drive,1);
3304                         twaddle();
3305                         process_fd_request();
3306                         return 0;
3307 
3308                 default:
3309                         return -EINVAL;
3310         }
3311 
3312         if (_IOC_DIR(cmd) & _IOC_READ)
3313                 return fd_copyout((void *)param, outparam, size);
3314         else
3315                 return 0;
3316 #undef IOCTL_ALLOWED
3317 #undef OUT
3318 #undef IN
3319 }
3320 
3321 static void config_types(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3322 {
3323         int first=1;
3324         int drive;
3325 
3326         /* read drive info out of physical cmos */
3327         drive=0;
3328         if (!UDP->cmos)
3329                 UDP->cmos= FLOPPY0_TYPE;
3330         drive=1;
3331         if (!UDP->cmos && FLOPPY1_TYPE)
3332                 UDP->cmos = FLOPPY1_TYPE;
3333 
3334         /* XXX */
3335         /* additional physical CMOS drive detection should go here */
3336 
3337         for (drive=0; drive < N_DRIVE; drive++){
3338                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3339                         memcpy((char *) UDP,
3340                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3341                                sizeof(struct floppy_drive_params));
3342                 if (UDP->cmos){
3343                         if (first)
3344                                 printk("Floppy drive(s): ");
3345                         else
3346                                 printk(", ");
3347                         first=0;
3348                         if (UDP->cmos > 0){
3349                                 allowed_drive_mask |= 1 << drive;
3350                                 printk("fd%d is %s", drive,
3351                                        default_drive_params[(int)UDP->cmos].name);
3352                         } else
3353                                 printk("fd%d is unknown type %d",drive,
3354                                        UDP->cmos);
3355                 }
3356         }
3357         if (!first)
3358                 printk("\n");
3359 }
3360 
3361 static int floppy_read(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3362                        char * buf, int count)
3363 {
3364         int drive = DRIVE(inode->i_rdev);
3365 
3366         check_disk_change(inode->i_rdev);
3367         if (UTESTF(FD_DISK_CHANGED))
3368                 return -ENXIO;
3369         return block_read(inode, filp, buf, count);
3370 }
3371 
3372 static int floppy_write(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3373                         const char * buf, int count)
3374 {
3375         int block;
3376         int ret;
3377         int drive = DRIVE(inode->i_rdev);
3378 
3379         if (!UDRS->maxblock)
3380                 UDRS->maxblock=1;/* make change detectable */
3381         check_disk_change(inode->i_rdev);
3382         if (UTESTF(FD_DISK_CHANGED))
3383                 return -ENXIO;
3384         if (!UTESTF(FD_DISK_WRITABLE))
3385                 return -EROFS;
3386         block = (filp->f_pos + count) >> 9;
3387         INFBOUND(UDRS->maxblock, block);
3388         ret= block_write(inode, filp, buf, count);
3389         return ret;
3390 }
3391 
3392 static void floppy_release(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3393 {
3394         int drive;
3395 
3396         drive = DRIVE(inode->i_rdev);
3397 
3398         if (!filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3399                 /* if the file is mounted OR (writable now AND writable at
3400                  * open time) Linus: Does this cover all cases? */
3401                 block_fsync(inode,filp);
3402 
3403         if (UDRS->fd_ref < 0)
3404                 UDRS->fd_ref=0;
3405         else if (!UDRS->fd_ref--) {
3406                 DPRINT("floppy_release with fd_ref == 0");
3407                 UDRS->fd_ref = 0;
3408         }
3409         floppy_release_irq_and_dma();
3410 }
3411 
3412 /*
3413  * floppy_open check for aliasing (/dev/fd0 can be the same as
3414  * /dev/PS0 etc), and disallows simultaneous access to the same
3415  * drive with different device numbers.
3416  */
3417 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3418 
3419 static int floppy_open(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3420 {
3421         int drive;
3422         int old_dev;
3423         int try;
3424         char *tmp;
3425 
3426         if (!filp) {
3427                 DPRINT("Weird, open called with filp=0\n");
3428                 return -EIO;
3429         }
3430 
3431         drive = DRIVE(inode->i_rdev);
3432         if (drive >= N_DRIVE ||
3433             !(allowed_drive_mask & (1 << drive)) ||
3434             fdc_state[FDC(drive)].version == FDC_NONE)
3435                 return -ENXIO;
3436 
3437         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3438                 return -ENXIO;
3439         old_dev = UDRS->fd_device;
3440         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3441                 return -EBUSY;
3442 
3443         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3444                 USETF(FD_DISK_CHANGED);
3445                 USETF(FD_VERIFY);
3446         }
3447 
3448         if (UDRS->fd_ref == -1 ||
3449            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3450                 return -EBUSY;
3451 
3452         if (floppy_grab_irq_and_dma())
3453                 return -EBUSY;
3454 
3455         if (filp->f_flags & O_EXCL)
3456                 UDRS->fd_ref = -1;
3457         else
3458                 UDRS->fd_ref++;
3459 
3460         if (!floppy_track_buffer){
3461                 /* if opening an ED drive, reserve a big buffer,
3462                  * else reserve a small one */
3463                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3464                         try = 64; /* Only 48 actually useful */
3465                 else
3466                         try = 32; /* Only 24 actually useful */
3467 
3468                 tmp=(char *)dma_mem_alloc(1024 * try);
3469                 if (!tmp) {
3470                         try >>= 1; /* buffer only one side */
3471                         INFBOUND(try, 16);
3472                         tmp= (char *)dma_mem_alloc(1024*try);
3473                 }
3474                 if (!tmp) {
3475                         DPRINT("Unable to allocate DMA memory\n");
3476                         RETERR(ENXIO);
3477                 }
3478                 if (floppy_track_buffer){
3479                         free_pages((unsigned long)tmp,__get_order(try*1024));
3480                 }else {
3481                         buffer_min = buffer_max = -1;
3482                         floppy_track_buffer = tmp;
3483                         max_buffer_sectors = try;
3484                 }
3485         }
3486 
3487         UDRS->fd_device = MINOR(inode->i_rdev);
3488         if (old_dev != -1 && old_dev != MINOR(inode->i_rdev)) {
3489                 if (buffer_drive == drive)
3490                         buffer_track = -1;
3491                 invalidate_buffers(MKDEV(FLOPPY_MAJOR,old_dev));
3492         }
3493 
3494         /* Allow ioctls if we have write-permissions even if read-only open */
3495         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3496                 filp->f_mode |= IOCTL_MODE_BIT;
3497         if (filp->f_mode & 2)
3498                 filp->f_mode |= OPEN_WRITE_BIT;
3499 
3500         if (UFDCS->rawcmd == 1)
3501                 UFDCS->rawcmd = 2;
3502 
3503         if (filp->f_flags & O_NDELAY)
3504                 return 0;
3505         if (filp->f_mode & 3) {
3506                 UDRS->last_checked = 0;
3507                 check_disk_change(inode->i_rdev);
3508                 if (UTESTF(FD_DISK_CHANGED))
3509                         RETERR(ENXIO);
3510         }
3511         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3512                 RETERR(EROFS);
3513         return 0;
3514 #undef RETERR
3515 }
3516 
3517 /*
3518  * Check if the disk has been changed or if a change has been faked.
3519  */
3520 static int check_floppy_change(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3521 {
3522         int drive = DRIVE(dev);
3523 
3524         if (MAJOR(dev) != MAJOR_NR) {
3525                 DPRINT("floppy_changed: not a floppy\n");
3526                 return 0;
3527         }
3528 
3529         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3530                 return 1;
3531 
3532         if (UDRS->last_checked + UDP->checkfreq < jiffies){
3533                 lock_fdc(drive,0);
3534                 poll_drive(0,0);
3535                 process_fd_request();
3536         }
3537 
3538         if (UTESTF(FD_DISK_CHANGED) ||
3539            UTESTF(FD_VERIFY) ||
3540            test_bit(drive, &fake_change) ||
3541            (!TYPE(dev) && !current_type[drive]))
3542                 return 1;
3543         return 0;
3544 }
3545 
3546 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3547  * the bootblock (block 0). "Autodetection" is also needed to check whether
3548  * there is a disk in the drive at all... Thus we also do it for fixed
3549  * geometry formats */
3550 static int floppy_revalidate(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3551 {
3552 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3553         struct buffer_head * bh;
3554         int drive=DRIVE(dev);
3555         int cf;
3556 
3557         if (UTESTF(FD_DISK_CHANGED) ||
3558            UTESTF(FD_VERIFY) ||
3559            test_bit(drive, &fake_change) ||
3560            NO_GEOM){
3561                 lock_fdc(drive,0);
3562                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3563                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)){
3564                         process_fd_request(); /*already done by another thread*/
3565                         return 0;
3566                 }
3567                 UDRS->maxblock = 0;
3568                 UDRS->maxtrack = 0;
3569                 if (buffer_drive == drive)
3570                         buffer_track = -1;
3571                 clear_bit(drive, &fake_change);
3572                 UCLEARF(FD_DISK_CHANGED);
3573                 if (cf)
3574                         UDRS->generation++;
3575                 if (NO_GEOM){
3576                         /* auto-sensing */
3577                         int size = floppy_blocksizes[MINOR(dev)];
3578                         if (!size)
3579                                 size = 1024;
3580                         if (!(bh = getblk(dev,0,size))){
3581                                 process_fd_request();
3582                                 return 1;
3583                         }
3584                         if (bh && !buffer_uptodate(bh))
3585                                 ll_rw_block(READ, 1, &bh);
3586                         process_fd_request();
3587                         wait_on_buffer(bh);
3588                         brelse(bh);
3589                         return 0;
3590                 }
3591                 if (cf)
3592                         poll_drive(0, FD_RAW_NEED_DISK);
3593                 process_fd_request();
3594         }
3595         return 0;
3596 }
3597 
3598 static struct file_operations floppy_fops = {
3599         NULL,                   /* lseek - default */
3600         floppy_read,            /* read - general block-dev read */
3601         floppy_write,           /* write - general block-dev write */
3602         NULL,                   /* readdir - bad */
3603         NULL,                   /* select */
3604         fd_ioctl,               /* ioctl */
3605         NULL,                   /* mmap */
3606         floppy_open,            /* open */
3607         floppy_release,         /* release */
3608         block_fsync,            /* fsync */
3609         NULL,                   /* fasync */
3610         check_floppy_change,    /* media_change */
3611         floppy_revalidate,      /* revalidate */
3612 };
3613 
3614 /*
3615  * Floppy Driver initialisation
3616  * =============================
3617  */
3618 
3619 /* Determine the floppy disk controller type */
3620 /* This routine was written by David C. Niemi */
3621 static char get_fdc_version(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3622 {
3623         int r;
3624 
3625         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3626         if (FDCS->reset)
3627                 return FDC_NONE;
3628         if ((r = result()) <= 0x00)
3629                 return FDC_NONE;        /* No FDC present ??? */
3630         if ((r==1) && (reply_buffer[0] == 0x80)){
3631                 printk("FDC %d is a 8272A\n",fdc);
3632                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3633         }
3634         if (r != 10) {
3635                 printk("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3636                        fdc, r);
3637                 return FDC_UNKNOWN;
3638         }
3639         output_byte(FD_VERSION);
3640         r = result();
3641         if ((r == 1) && (reply_buffer[0] == 0x80)){
3642                 printk("FDC %d is a 82072\n",fdc);
3643                 return FDC_82072;               /* 82072 doesn't know VERSION */
3644         }
3645         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3646                 printk("FDC %d init: VERSION: unexpected return of %d bytes.\n",
3647                        fdc, r);
3648                 return FDC_UNKNOWN;
3649         }
3650         output_byte(FD_UNLOCK);
3651         r = result();
3652         if ((r == 1) && (reply_buffer[0] == 0x80)){
3653                 printk("FDC %d is a pre-1991 82077\n", fdc);
3654                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3655         }
3656         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3657                 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3658                        fdc, r);
3659                 return FDC_UNKNOWN;
3660         }
3661         output_byte(FD_PARTID);
3662         r = result();
3663         if (r != 1) {
3664                 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3665                        fdc, r);
3666                 return FDC_UNKNOWN;
3667         }
3668         if (reply_buffer[0] == 0x80) {
3669                 printk("FDC %d is a post-1991 82077\n",fdc);
3670                 return FDC_82077;       /* Revised 82077AA passes all the tests */
3671         }
3672         switch (reply_buffer[0] >> 5) {
3673                 case 0x0:
3674                         output_byte(FD_SAVE);
3675                         r = result();
3676                         if (r != 16) {
3677                                 printk("FDC %d init: SAVE: unexpected return of %d bytes.\n", fdc, r);
3678                                 return FDC_UNKNOWN;
3679                         }
3680                         if (!(reply_buffer[0] & 0x40)) {
3681                                 printk("FDC %d is a 3Volt 82078SL.\n",fdc);
3682                                 return FDC_82078;
3683                         }
3684                         /* Either a 82078-1 or a 82078SL running at 5Volt */
3685                         printk("FDC %d is a 82078-1.\n",fdc);
3686                         return FDC_82078_1;
3687                 case 0x1:
3688                         printk("FDC %d is a 44pin 82078\n",fdc);
3689                         return FDC_82078;
3690                 case 0x2:
3691                         printk("FDC %d is a S82078B\n", fdc);
3692                         return FDC_S82078B;
3693                 case 0x3:
3694                         printk("FDC %d is a National Semiconductor PC87306\n", fdc);
3695                         return FDC_87306;
3696                 default:
3697                         printk("FDC %d init: 82077 variant with PARTID=%d.\n",
3698                                fdc, reply_buffer[0] >> 5);
3699                         return FDC_82077_UNKN;
3700         }
3701 } /* get_fdc_version */
3702 
3703 /* lilo configuration */
3704 
3705 /* we make the invert_dcl function global. One day, somebody might
3706  * want to centralize all thinkpad related options into one lilo option,
3707  * there are just so many thinkpad related quirks! */
3708 void floppy_invert_dcl(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3709 {
3710         int i;
3711 
3712         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3713                 if (param)
3714                         default_drive_params[i].params.flags |= 0x80;
3715                 else
3716                         default_drive_params[i].params.flags &= ~0x80;
3717         }
3718         DPRINT("Configuring drives for inverted dcl\n");
3719 }
3720 
3721 static void daring(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3722 {
3723         int i;
3724 
3725         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3726                 if (param){
3727                         default_drive_params[i].params.select_delay = 0;
3728                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3729                 } else {
3730                         default_drive_params[i].params.select_delay = 2*HZ/100;
3731                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3732                 }
3733         }
3734         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3735 }
3736 
3737 static void allow_drives(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3738 {
3739         allowed_drive_mask=param;
3740         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3741 }
3742 
3743 static void fdc2_adr(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3744 {
3745         FDC2 = param;
3746         if (param)
3747                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3748         else
3749                 DPRINT("disabling second fdc\n");
3750 }
3751 
3752 static void unex(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3753 {
3754         print_unex = param;
3755         DPRINT1("%sprinting messages for unexpected interrupts\n",
3756                 param ? "" : "not ");
3757 }
3758 
3759 static void set_cmos(int *ints, int dummy)
     /* [previous][next][first][last][top][bottom][index][help] */
3760 {
3761         int current_drive=0;
3762 
3763         if (ints[0] != 2){
3764                 DPRINT("wrong number of parameter for cmos\n");
3765                 return;
3766         }
3767         current_drive = ints[1];
3768         if (current_drive < 0 || current_drive >= 8){
3769                 DPRINT("bad drive for set_cmos\n");
3770                 return;
3771         }
3772         if (current_drive >= 4 && !FDC2)
3773                 fdc2_adr(0, 0x370);
3774         if (ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3775                 DPRINT1("bad cmos code %d\n", ints[2]);
3776                 return;
3777         }
3778         DP->cmos = ints[2];
3779         DPRINT1("setting cmos code to %d\n", ints[2]);
3780 }
3781 
3782 static struct param_table {
3783         const char *name;
3784         void (*fn)(int *ints, int param);
3785         int def_param;
3786 } config_params[]={
3787         { "allowed_drive_mask", allow_drives, 0xff },
3788         { "all_drives", allow_drives, 0xff },
3789         { "asus_pci", allow_drives, 0x33 },
3790 
3791         { "daring", daring, 1},
3792 
3793         { "two_fdc", fdc2_adr, 0x370 },
3794         { "one_fdc", fdc2_adr, 0 },
3795 
3796         { "thinkpad", floppy_invert_dcl, 1 },
3797 
3798         { "cmos", set_cmos, 0 },
3799 
3800         { "unexpected_interrupts", unex, 1 },
3801         { "no_unexpected_interrupts", unex, 0 },
3802         { "L40SX", unex, 0 } };
3803 
3804 #define FLOPPY_SETUP
3805 void floppy_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
3806 {
3807         int i;
3808         int param;
3809         if (str)
3810                 for (i=0; i< ARRAY_SIZE(config_params); i++){
3811                         if (strcmp(str,config_params[i].name) == 0){
3812                                 if (ints[0])
3813                                         param = ints[1];
3814                                 else
3815                                         param = config_params[i].def_param;
3816                                 config_params[i].fn(ints,param);
3817                                 return;
3818                         }
3819                 }
3820         if (str) {
3821                 DPRINT1("unknown floppy option [%s]\n", str);
3822                 
3823                 DPRINT("allowed options are:");
3824                 for (i=0; i< ARRAY_SIZE(config_params); i++)
3825                         printk(" %s",config_params[i].name);
3826                 printk("\n");
3827         } else
3828                 DPRINT("botched floppy option\n");
3829         DPRINT("Read linux/drivers/block/README.fd\n");
3830 }
3831 
3832 int floppy_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3833 {
3834         int i,unit,drive;
3835         int have_no_fdc= -EIO;
3836 
3837         raw_cmd = 0;
3838 
3839         sti();
3840 
3841         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3842                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3843                 return -EBUSY;
3844         }
3845 
3846         for (i=0; i<256; i++)
3847                 if (ITYPE(i))
3848                         floppy_sizes[i] = floppy_type[ITYPE(i)].size >> 1;
3849                 else
3850                         floppy_sizes[i] = MAX_DISK_SIZE;
3851 
3852         blk_size[MAJOR_NR] = floppy_sizes;
3853         blksize_size[MAJOR_NR] = floppy_blocksizes;
3854         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3855         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3856         config_types();
3857 
3858         for (i = 0; i < N_FDC; i++) {
3859                 fdc = i;
3860                 CLEARSTRUCT(FDCS);
3861                 FDCS->dtr = -1;
3862                 FDCS->dor = 0x4;
3863         }
3864 
3865         fdc_state[0].address = FDC1;
3866 #if N_FDC > 1
3867         fdc_state[1].address = FDC2;
3868 #endif
3869 
3870         if (floppy_grab_irq_and_dma()){
3871                 unregister_blkdev(MAJOR_NR,"fd");
3872                 return -EBUSY;
3873         }
3874 
3875         /* initialise drive state */
3876         for (drive = 0; drive < N_DRIVE; drive++) {
3877                 CLEARSTRUCT(UDRS);
3878                 CLEARSTRUCT(UDRWE);
3879                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3880                 UDRS->fd_device = -1;
3881                 floppy_track_buffer = NULL;
3882                 max_buffer_sectors = 0;
3883         }
3884 
3885         for (i = 0; i < N_FDC; i++) {
3886                 fdc = i;
3887                 FDCS->driver_version = FD_DRIVER_VERSION;
3888                 for (unit=0; unit<4; unit++)
3889                         FDCS->track[unit] = 0;
3890                 if (FDCS->address == -1)
3891                         continue;
3892                 FDCS->rawcmd = 2;
3893                 if (user_reset_fdc(-1,FD_RESET_ALWAYS,0)){
3894                         FDCS->address = -1;
3895                         continue;
3896                 }
3897                 /* Try to determine the floppy controller type */
3898                 FDCS->version = get_fdc_version();
3899                 if (FDCS->version == FDC_NONE){
3900                         FDCS->address = -1;
3901                         continue;
3902                 }
3903 
3904                 request_region(FDCS->address, 6, "floppy");
3905                 request_region(FDCS->address+7, 1, "floppy DIR");
3906                 /* address + 6 is reserved, and may be taken by IDE.
3907                  * Unfortunately, Adaptec doesn't know this :-(, */
3908 
3909                 have_no_fdc = 0;
3910                 /* Not all FDCs seem to be able to handle the version command
3911                  * properly, so force a reset for the standard FDC clones,
3912                  * to avoid interrupt garbage.
3913                  */
3914                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3915                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3916         }
3917         fdc=0;
3918         del_timer(&fd_timeout);
3919         current_drive = 0;
3920         floppy_release_irq_and_dma();
3921         initialising=0;
3922         if (have_no_fdc) {
3923                 DPRINT("no floppy controllers found\n");
3924                 unregister_blkdev(MAJOR_NR,"fd");
3925         } else
3926                 virtual_dma_init();
3927         return have_no_fdc;
3928 }
3929 
3930 static int floppy_grab_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3931 {
3932         int i;
3933         cli();
3934         if (usage_count++){
3935                 sti();
3936                 return 0;
3937         }
3938         sti();
3939         MOD_INC_USE_COUNT;
3940         for (i=0; i< N_FDC; i++){
3941                 if (FDCS->address != -1){
3942                         fdc = i;
3943                         reset_fdc_info(1);
3944                         fd_outb(FDCS->dor, FD_DOR);
3945                 }
3946         }
3947         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3948 
3949         if (fd_request_irq()) {
3950                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3951                         FLOPPY_IRQ);
3952                 return -1;
3953         }
3954         if (fd_request_dma()) {
3955                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3956                         FLOPPY_DMA);
3957                 fd_free_irq();
3958                 return -1;
3959         }
3960         for (fdc = 0; fdc < N_FDC; fdc++)
3961                 if (FDCS->address != -1)
3962                         fd_outb(FDCS->dor, FD_DOR);
3963         fdc = 0;
3964         fd_enable_irq();
3965         return 0;
3966 }
3967 
3968 static void floppy_release_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3969 {
3970 #ifdef FLOPPY_SANITY_CHECK
3971         int drive;
3972 #endif
3973         long tmpsize;
3974         void *tmpaddr;
3975 
3976         cli();
3977         if (--usage_count){
3978                 sti();
3979                 return;
3980         }
3981         sti();
3982         MOD_DEC_USE_COUNT;
3983         fd_disable_dma();
3984         fd_free_dma();
3985         fd_disable_irq();
3986         fd_free_irq();
3987 
3988         set_dor(0, ~0, 8);
3989 #if N_FDC > 1
3990         set_dor(1, ~8, 0);
3991 #endif
3992         floppy_enable_hlt();
3993 
3994         if (floppy_track_buffer && max_buffer_sectors) {
3995                 tmpsize = max_buffer_sectors*1024;
3996                 tmpaddr = (void *)floppy_track_buffer;
3997                 floppy_track_buffer = 0;
3998                 max_buffer_sectors = 0;
3999                 buffer_min = buffer_max = -1;
4000                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
4001         }
4002 
4003 #ifdef FLOPPY_SANITY_CHECK
4004         for (drive=0; drive < N_FDC * 4; drive++)
4005                 if (motor_off_timer[drive].next)
4006                         printk("motor off timer %d still active\n", drive);
4007 
4008         if (fd_timeout.next)
4009                 printk("floppy timer still active:%s\n", timeout_message);
4010         if (fd_timer.next)
4011                 printk("auxiliary floppy timer still active\n");
4012         if (floppy_tq.sync)
4013                 printk("task queue still active\n");
4014 #endif
4015 }
4016 
4017 
4018 #ifdef MODULE
4019 
4020 extern char *get_options(char *str, int *ints);
4021 
4022 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /* [previous][next][first][last][top][bottom][index][help] */
4023 {
4024         int i;
4025         char c;
4026         int j;
4027         int match;
4028         char buffer[100];
4029         int ints[11];
4030         int length = strlen(pattern)+1;
4031 
4032         match=0;
4033         j=1;
4034 
4035         for (i=current->mm->env_start; i< current->mm->env_end; i ++){
4036                 c= get_fs_byte(i);
4037                 if (match){
4038                         if (j==99)
4039                                 c='\0';
4040                         buffer[j] = c;
4041                         if (!c || c == ' ' || c == '\t'){
4042                                 if (j){
4043                                         buffer[j] = '\0';
4044                                         setup(get_options(buffer,ints),ints);
4045                                 }
4046                                 j=0;
4047                         } else
4048                                 j++;
4049                         if (!c)
4050                                 break;
4051                         continue;
4052                 }
4053                 if ((!j && !c) || (j && c == pattern[j-1]))
4054                         j++;
4055                 else
4056                         j=0;
4057                 if (j==length){
4058                         match=1;
4059                         j=0;
4060                 }
4061         }
4062 }
4063 
4064 
4065 #ifdef __cplusplus
4066 extern "C" {
4067 #endif
4068 int init_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4069 {
4070         printk("inserting floppy driver for %s\n", kernel_version);
4071                 
4072         mod_setup("floppy=", floppy_setup);
4073                 
4074         return floppy_init();
4075 }
4076 
4077 void cleanup_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4078 {
4079         int fdc;
4080                 
4081         for (fdc=0; fdc<2; fdc++)
4082                 if (FDCS->address != -1){
4083                         release_region(FDCS->address, 6);
4084                         release_region(FDCS->address+7, 1);
4085         }
4086                 
4087         unregister_blkdev(MAJOR_NR, "fd");
4088 
4089         blk_dev[MAJOR_NR].request_fn = 0;
4090 }
4091 
4092 #ifdef __cplusplus
4093 }
4094 #endif
4095 
4096 #endif
/* [previous][next][first][last][top][bottom][index][help] */