root/drivers/block/floppy.c

/* [previous][next][first][last][top][bottom][index][help] */

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(unsigned long size)
     /* [previous][next][first][last][top][bottom][index][help] */
 175 {
 176         int order;
 177 
 178         size = (size-1) >> (PAGE_SHIFT-1);
 179         order = -1;
 180         do {
 181                 size >>= 1;
 182                 order++;
 183         } while (size);
 184         return order;
 185 }
 186 
 187 static unsigned long dma_mem_alloc(int size)
     /* [previous][next][first][last][top][bottom][index][help] */
 188 {
 189         int order = __get_order(size);
 190 
 191         return __get_dma_pages(GFP_KERNEL,order);
 192 }
 193 
 194 /* End dma memory related stuff */
 195 
 196 static unsigned int fake_change = 0;
 197 static int initialising=1;
 198 
 199 static inline int TYPE(kdev_t x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 200         return  (MINOR(x)>>2) & 0x1f;
 201 }
 202 static inline int DRIVE(kdev_t x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 203         return (MINOR(x)&0x03) | ((MINOR(x)&0x80) >> 5);
 204 }
 205 #define ITYPE(x) (((x)>>2) & 0x1f)
 206 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 207 #define UNIT(x) ((x) & 0x03)            /* drive on fdc */
 208 #define FDC(x) (((x) & 0x04) >> 2)  /* fdc of drive */
 209 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
 210                                 /* reverse mapping from unit and fdc to drive */
 211 #define DP (&drive_params[current_drive])
 212 #define DRS (&drive_state[current_drive])
 213 #define DRWE (&write_errors[current_drive])
 214 #define FDCS (&fdc_state[fdc])
 215 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 216 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 217 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 218 
 219 #define UDP (&drive_params[drive])
 220 #define UDRS (&drive_state[drive])
 221 #define UDRWE (&write_errors[drive])
 222 #define UFDCS (&fdc_state[FDC(drive)])
 223 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 224 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 225 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 226 
 227 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 228 
 229 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 230 
 231 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 232 
 233 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 234 
 235 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 236 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 237 
 238 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
 239 
 240 /* read/write */
 241 #define COMMAND raw_cmd->cmd[0]
 242 #define DR_SELECT raw_cmd->cmd[1]
 243 #define TRACK raw_cmd->cmd[2]
 244 #define HEAD raw_cmd->cmd[3]
 245 #define SECTOR raw_cmd->cmd[4]
 246 #define SIZECODE raw_cmd->cmd[5]
 247 #define SECT_PER_TRACK raw_cmd->cmd[6]
 248 #define GAP raw_cmd->cmd[7]
 249 #define SIZECODE2 raw_cmd->cmd[8]
 250 #define NR_RW 9
 251 
 252 /* format */
 253 #define F_SIZECODE raw_cmd->cmd[2]
 254 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 255 #define F_GAP raw_cmd->cmd[4]
 256 #define F_FILL raw_cmd->cmd[5]
 257 #define NR_F 6
 258 
 259 /*
 260  * Maximum disk size (in kilobytes). This default is used whenever the
 261  * current disk size is unknown.
 262  * [Now it is rather a minimum]
 263  */
 264 #define MAX_DISK_SIZE 2 /* 3984*/
 265 
 266 #define K_64    0x10000         /* 64KB */
 267 
 268 /*
 269  * globals used by 'result()'
 270  */
 271 #define MAX_REPLIES 17
 272 static unsigned char reply_buffer[MAX_REPLIES];
 273 static int inr; /* size of reply buffer, when called from interrupt */
 274 #define ST0 (reply_buffer[0])
 275 #define ST1 (reply_buffer[1])
 276 #define ST2 (reply_buffer[2])
 277 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 278 #define R_TRACK (reply_buffer[3])
 279 #define R_HEAD (reply_buffer[4])
 280 #define R_SECTOR (reply_buffer[5])
 281 #define R_SIZECODE (reply_buffer[6])
 282 
 283 #define SEL_DLY (2*HZ/100)
 284 
 285 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 286 /*
 287  * this struct defines the different floppy drive types.
 288  */
 289 static struct {
 290         struct floppy_drive_params params;
 291         const char *name; /* name printed while booting */
 292 } default_drive_params[]= {
 293 /* NOTE: the time values in jiffies should be in msec!
 294  CMOS drive type
 295   |     Maximum data rate supported by drive type
 296   |     |   Head load time, msec
 297   |     |   |   Head unload time, msec (not used)
 298   |     |   |   |     Step rate interval, usec
 299   |     |   |   |     |       Time needed for spinup time (jiffies)
 300   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 301   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 302   |     |   |   |     |       |      |   |     Select delay
 303   |     |   |   |     |       |      |   |     |     RPS
 304   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 305   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 306   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 307   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 308 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 309       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 310 
 311 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 312       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 313 
 314 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 315       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 316 
 317 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 318       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 319 
 320 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 321       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 322 
 323 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 324       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 325 
 326 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 327       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 328 /*    |  --autodetected formats---    |      |      |
 329  *    read_track                      |      |    Name printed when booting
 330  *                                    |     Native format
 331  *                  Frequency of disk change checks */
 332 };
 333 
 334 static struct floppy_drive_params drive_params[N_DRIVE];
 335 static struct floppy_drive_struct drive_state[N_DRIVE];
 336 static struct floppy_write_errors write_errors[N_DRIVE];
 337 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 338 
 339 /*
 340  * This struct defines the different floppy types.
 341  *
 342  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 343  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 344  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 345  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 346  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 347  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 348  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 349  * 'stretch' should probably be renamed to something more general, like
 350  * 'options'.  Other parameters should be self-explanatory (see also
 351  * setfdprm(8)).
 352  */
 353 static struct floppy_struct floppy_type[32] = {
 354         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 355         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 356         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 357         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 358         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 359         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 360         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 361         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 362         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 363         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 364 
 365         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 366         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 367         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 368         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 369         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 370         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 371         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 372         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 373         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 374         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 375 
 376         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 377         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 378         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 379         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 380         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 381         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 382         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 383         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 384         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 385 
 386         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 387         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 388         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 389 };
 390 
 391 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 392 #define SECTSIZE (_FD_SECTSIZE(*floppy))
 393 
 394 /* Auto-detection: Disk type used until the next media change occurs. */
 395 static struct floppy_struct *current_type[N_DRIVE] = {
 396         NULL, NULL, NULL, NULL,
 397         NULL, NULL, NULL, NULL
 398 };
 399 
 400 /*
 401  * User-provided type information. current_type points to
 402  * the respective entry of this array.
 403  */
 404 static struct floppy_struct user_params[N_DRIVE];
 405 
 406 static int floppy_sizes[256];
 407 static int floppy_blocksizes[256] = { 0, };
 408 
 409 /*
 410  * The driver is trying to determine the correct media format
 411  * while probing is set. rw_interrupt() clears it after a
 412  * successful access.
 413  */
 414 static int probing = 0;
 415 
 416 /* Synchronization of FDC access. */
 417 #define FD_COMMAND_NONE -1
 418 #define FD_COMMAND_ERROR 2
 419 #define FD_COMMAND_OKAY 3
 420 
 421 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 422 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 423 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 424 #define CALL(x) if ((x) == -EINTR) return -EINTR
 425 #define ECALL(x) if ((ret = (x))) return ret;
 426 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 427 #define WAIT(x) _WAIT((x),interruptible)
 428 #define IWAIT(x) _WAIT((x),1)
 429 
 430 /* Errors during formatting are counted here. */
 431 static int format_errors;
 432 
 433 /* Format request descriptor. */
 434 static struct format_descr format_req;
 435 
 436 /*
 437  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 438  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 439  * H is head unload time (1=16ms, 2=32ms, etc)
 440  */
 441 
 442 /*
 443  * Track buffer
 444  * Because these are written to by the DMA controller, they must
 445  * not contain a 64k byte boundary crossing, or data will be
 446  * corrupted/lost.
 447  */
 448 static char *floppy_track_buffer=0;
 449 static int max_buffer_sectors=0;
 450 
 451 static int *errors;
 452 typedef void (*done_f)(int);
 453 static struct cont_t {
 454         void (*interrupt)(void); /* this is called after the interrupt of the
 455                                   * main command */
 456         void (*redo)(void); /* this is called to retry the operation */
 457         void (*error)(void); /* this is called to tally an error */
 458         done_f done; /* this is called to say if the operation has 
 459                       * succeeded/failed */
 460 } *cont=NULL;
 461 
 462 static void floppy_ready(void);
 463 static void floppy_start(void);
 464 static void process_fd_request(void);
 465 static void recalibrate_floppy(void);
 466 static void floppy_shutdown(void);
 467 
 468 static int floppy_grab_irq_and_dma(void);
 469 static void floppy_release_irq_and_dma(void);
 470 
 471 /*
 472  * The "reset" variable should be tested whenever an interrupt is scheduled,
 473  * after the commands have been sent. This is to ensure that the driver doesn't
 474  * get wedged when the interrupt doesn't come because of a failed command.
 475  * reset doesn't need to be tested before sending commands, because
 476  * output_byte is automatically disabled when reset is set.
 477  */
 478 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
 479 static void reset_fdc(void);
 480 
 481 /*
 482  * These are global variables, as that's the easiest way to give
 483  * information to interrupts. They are the data used for the current
 484  * request.
 485  */
 486 #define NO_TRACK -1
 487 #define NEED_1_RECAL -2
 488 #define NEED_2_RECAL -3
 489 
 490 /* */
 491 static int usage_count = 0;
 492 
 493 
 494 /* buffer related variables */
 495 static int buffer_track = -1;
 496 static int buffer_drive = -1;
 497 static int buffer_min = -1;
 498 static int buffer_max = -1;
 499 
 500 /* fdc related variables, should end up in a struct */
 501 static struct floppy_fdc_state fdc_state[N_FDC];
 502 static int fdc; /* current fdc */
 503 
 504 static struct floppy_struct * floppy = floppy_type;
 505 static unsigned char current_drive = 0;
 506 static long current_count_sectors = 0;
 507 static unsigned char sector_t; /* sector in track */
 508 
 509 #ifdef DEBUGT
 510 static long unsigned debugtimer;
 511 #endif
 512 
 513 /*
 514  * Debugging
 515  * =========
 516  */
 517 static inline void set_debugt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 518 {
 519 #ifdef DEBUGT
 520         debugtimer = jiffies;
 521 #endif
 522 }
 523 
 524 static inline void debugt(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 525 {
 526 #ifdef DEBUGT
 527         if (DP->flags & DEBUGT)
 528                 printk("%s dtime=%lu\n", message, jiffies-debugtimer);
 529 #endif
 530 }
 531 
 532 typedef void (*timeout_fn)(unsigned long);
 533 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 534                                        (timeout_fn) floppy_shutdown };
 535 
 536 static const char *timeout_message;
 537 
 538 #ifdef FLOPPY_SANITY_CHECK
 539 static void is_alive(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 540 {
 541         /* this routine checks whether the floppy driver is "alive" */
 542         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 543                 DPRINT1("timeout handler died: %s\n",message);
 544         }
 545 }
 546 #endif
 547 
 548 #ifdef FLOPPY_SANITY_CHECK
 549 
 550 #define OLOGSIZE 20
 551 
 552 static void (*lasthandler)(void) = NULL;
 553 static int interruptjiffies=0;
 554 static int resultjiffies=0;
 555 static int resultsize=0;
 556 static int lastredo=0;
 557 
 558 static struct output_log {
 559         unsigned char data;
 560         unsigned char status;
 561         unsigned long jiffies;
 562 } output_log[OLOGSIZE];
 563 
 564 static int output_log_pos=0;
 565 #endif
 566 
 567 #define CURRENTD -1
 568 #define MAXTIMEOUT -2
 569 
 570 static void reschedule_timeout(int drive, const char *message, int marg)
     /* [previous][next][first][last][top][bottom][index][help] */
 571 {
 572         if (drive == CURRENTD)
 573                 drive = current_drive;
 574         del_timer(&fd_timeout);
 575         if (drive < 0 || drive > N_DRIVE) {
 576                 fd_timeout.expires = jiffies + 20*HZ;
 577                 drive=0;
 578         } else
 579                 fd_timeout.expires = jiffies + UDP->timeout;
 580         add_timer(&fd_timeout);
 581         if (UDP->flags & FD_DEBUG){
 582                 DPRINT("reschedule timeout ");
 583                 printk(message, marg);
 584                 printk("\n");
 585         }
 586         timeout_message = message;
 587 }
 588 
 589 static int maximum(int a, int b)
     /* [previous][next][first][last][top][bottom][index][help] */
 590 {
 591         if(a > b)
 592                 return a;
 593         else
 594                 return b;
 595 }
 596 #define INFBOUND(a,b) (a)=maximum((a),(b));
 597 
 598 static int minimum(int a, int b)
     /* [previous][next][first][last][top][bottom][index][help] */
 599 {
 600         if(a < b)
 601                 return a;
 602         else
 603                 return b;
 604 }
 605 #define SUPBOUND(a,b) (a)=minimum((a),(b));
 606 
 607 
 608 /*
 609  * Bottom half floppy driver.
 610  * ==========================
 611  *
 612  * This part of the file contains the code talking directly to the hardware,
 613  * and also the main service loop (seek-configure-spinup-command)
 614  */
 615 
 616 /*
 617  * disk change.
 618  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 619  * and the last_checked date.
 620  *
 621  * last_checked is the date of the last check which showed 'no disk change'
 622  * FD_DISK_CHANGE is set under two conditions:
 623  * 1. The floppy has been changed after some i/o to that floppy already
 624  *    took place.
 625  * 2. No floppy disk is in the drive. This is done in order to ensure that
 626  *    requests are quickly flushed in case there is no disk in the drive. It
 627  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 628  *    the drive.
 629  *
 630  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 631  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 632  *  each seek. If a disk is present, the disk change line should also be
 633  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 634  *  change line is set, this means either that no disk is in the drive, or
 635  *  that it has been removed since the last seek.
 636  *
 637  * This means that we really have a third possibility too:
 638  *  The floppy has been changed after the last seek.
 639  */
 640 
 641 static int disk_change(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 642 {
 643         int fdc=FDC(drive);
 644 #ifdef FLOPPY_SANITY_CHECK
 645         if (jiffies < UDP->select_delay + UDRS->select_date)
 646                 DPRINT("WARNING disk change called early\n");
 647         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 648            (FDCS->dor & 3) != UNIT(drive) ||
 649            fdc != FDC(drive)){
 650                 DPRINT("probing disk change on unselected drive\n");
 651                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 652                         FDCS->dor);
 653         }
 654 #endif
 655 
 656 #ifdef DCL_DEBUG
 657         if (UDP->flags & FD_DEBUG){
 658                 DPRINT1("checking disk change line for drive %d\n",drive);
 659                 DPRINT1("jiffies=%ld\n", jiffies);
 660                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 661                 DPRINT1("flags=%x\n",UDRS->flags);
 662         }
 663 #endif
 664         if (UDP->flags & FD_BROKEN_DCL)
 665                 return UTESTF(FD_DISK_CHANGED);
 666         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 667                 USETF(FD_VERIFY); /* verify write protection */
 668                 if (UDRS->maxblock){
 669                         /* mark it changed */
 670                         USETF(FD_DISK_CHANGED);
 671 
 672                         /* invalidate its geometry */
 673                         if (UDRS->keep_data >= 0) {
 674                                 if ((UDP->flags & FTD_MSG) &&
 675                                     current_type[drive] != NULL)
 676                                         DPRINT("Disk type is undefined after "
 677                                                "disk change\n");
 678                                 current_type[drive] = NULL;
 679                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 680                         }
 681                 }
 682                 /*USETF(FD_DISK_NEWCHANGE);*/
 683                 return 1;
 684         } else {
 685                 UDRS->last_checked=jiffies;
 686                 UCLEARF(FD_DISK_NEWCHANGE);
 687         }
 688         return 0;
 689 }
 690 
 691 static inline int is_selected(int dor, int unit)
     /* [previous][next][first][last][top][bottom][index][help] */
 692 {
 693         return ((dor  & (0x10 << unit)) && (dor &3) == unit);
 694 }
 695 
 696 static int set_dor(int fdc, char mask, char data)
     /* [previous][next][first][last][top][bottom][index][help] */
 697 {
 698         register unsigned char drive, unit, newdor,olddor;
 699 
 700         if (FDCS->address == -1)
 701                 return -1;
 702 
 703         olddor = FDCS->dor;
 704         newdor =  (olddor & mask) | data;
 705         if (newdor != olddor){
 706                 unit = olddor & 0x3;
 707                 if (is_selected(olddor, unit) && !is_selected(newdor,unit)){
 708                         drive = REVDRIVE(fdc,unit);
 709 #ifdef DCL_DEBUG
 710                         if (UDP->flags & FD_DEBUG){
 711                                 DPRINT("calling disk change from set_dor\n");
 712                         }
 713 #endif
 714                         disk_change(drive);
 715                 }
 716                 FDCS->dor = newdor;
 717                 fd_outb(newdor, FD_DOR);
 718 
 719                 unit = newdor & 0x3;
 720                 if (!is_selected(olddor, unit) && is_selected(newdor,unit)){
 721                         drive = REVDRIVE(fdc,unit);
 722                         UDRS->select_date = jiffies;
 723                 }
 724         }
 725         if (newdor & 0xf0)
 726                 floppy_grab_irq_and_dma();
 727         if (olddor & 0xf0)
 728                 floppy_release_irq_and_dma();
 729         return olddor;
 730 }
 731 
 732 static void twaddle(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 733 {
 734         if (DP->select_delay)
 735                 return;
 736         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 737         fd_outb(FDCS->dor, FD_DOR);
 738         DRS->select_date = jiffies;
 739 }
 740 
 741 /* reset all driver information about the current fdc. This is needed after
 742  * a reset, and after a raw command. */
 743 static void reset_fdc_info(int mode)
     /* [previous][next][first][last][top][bottom][index][help] */
 744 {
 745         int drive;
 746 
 747         FDCS->spec1 = FDCS->spec2 = -1;
 748         FDCS->need_configure = 1;
 749         FDCS->perp_mode = 1;
 750         FDCS->rawcmd = 0;
 751         for (drive = 0; drive < N_DRIVE; drive++)
 752                 if (FDC(drive) == fdc &&
 753                     (mode || UDRS->track != NEED_1_RECAL))
 754                         UDRS->track = NEED_2_RECAL;
 755 }
 756 
 757 /* selects the fdc and drive, and enables the fdc's input/dma. */
 758 static void set_fdc(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 759 {
 760         if (drive >= 0 && drive < N_DRIVE){
 761                 fdc = FDC(drive);
 762                 current_drive = drive;
 763         }
 764         if (fdc != 1 && fdc != 0) {
 765                 printk("bad fdc value\n");
 766                 return;
 767         }
 768         set_dor(fdc,~0,8);
 769         set_dor(1-fdc, ~8, 0);
 770         if (FDCS->rawcmd == 2)
 771                 reset_fdc_info(1);
 772         if (fd_inb(FD_STATUS) != STATUS_READY)
 773                 FDCS->reset = 1;
 774 }
 775 
 776 /* locks the driver */
 777 static int lock_fdc(int drive, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
 778 {
 779         if (!usage_count){
 780                 printk("trying to lock fdc while usage count=0\n");
 781                 return -1;
 782         }
 783         floppy_grab_irq_and_dma();
 784         cli();
 785         while (fdc_busy && NO_SIGNAL)
 786                 interruptible_sleep_on(&fdc_wait);
 787         if (fdc_busy){
 788                 sti();
 789                 return -EINTR;
 790         }
 791         fdc_busy = 1;
 792         sti();
 793         command_status = FD_COMMAND_NONE;
 794         reschedule_timeout(drive, "lock fdc", 0);
 795         set_fdc(drive);
 796         return 0;
 797 }
 798 
 799 #define LOCK_FDC(drive,interruptible) \
 800 if (lock_fdc(drive,interruptible)) return -EINTR;
 801 
 802 
 803 /* unlocks the driver */
 804 static inline void unlock_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 805 {
 806         raw_cmd = 0;
 807         if (!fdc_busy)
 808                 DPRINT("FDC access conflict!\n");
 809 
 810         if (DEVICE_INTR)
 811                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 812                         DEVICE_INTR);
 813         command_status = FD_COMMAND_NONE;
 814         del_timer(&fd_timeout);
 815         cont = NULL;
 816         fdc_busy = 0;
 817         floppy_release_irq_and_dma();
 818         wake_up(&fdc_wait);
 819 }
 820 
 821 /* switches the motor off after a given timeout */
 822 static void motor_off_callback(unsigned long nr)
     /* [previous][next][first][last][top][bottom][index][help] */
 823 {
 824         unsigned char mask = ~(0x10 << UNIT(nr));
 825 
 826         set_dor(FDC(nr), mask, 0);
 827 }
 828 
 829 static struct timer_list motor_off_timer[N_DRIVE] = {
 830         { NULL, NULL, 0, 0, motor_off_callback },
 831         { NULL, NULL, 0, 1, motor_off_callback },
 832         { NULL, NULL, 0, 2, motor_off_callback },
 833         { NULL, NULL, 0, 3, motor_off_callback },
 834         { NULL, NULL, 0, 4, motor_off_callback },
 835         { NULL, NULL, 0, 5, motor_off_callback },
 836         { NULL, NULL, 0, 6, motor_off_callback },
 837         { NULL, NULL, 0, 7, motor_off_callback }
 838 };
 839 
 840 /* schedules motor off */
 841 static void floppy_off(unsigned int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 842 {
 843         unsigned long volatile delta;
 844         register int fdc=FDC(drive);
 845 
 846         if (!(FDCS->dor & (0x10 << UNIT(drive))))
 847                 return;
 848 
 849         del_timer(motor_off_timer+drive);
 850 
 851         /* make spindle stop in a position which minimizes spinup time
 852          * next time */
 853         if (UDP->rps){
 854                 delta = jiffies - UDRS->first_read_date + HZ -
 855                         UDP->spindown_offset;
 856                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
 857                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 858         }
 859         add_timer(motor_off_timer+drive);
 860 }
 861 
 862 /*
 863  * cycle through all N_DRIVE floppy drives, for disk change testing.
 864  * stopping at current drive. This is done before any long operation, to
 865  * be sure to have up to date disk change information.
 866  */
 867 static void scandrives(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 868 {
 869         int i, drive, saved_drive;
 870 
 871         if (DP->select_delay)
 872                 return;
 873 
 874         saved_drive = current_drive;
 875         for (i=0; i < N_DRIVE; i++){
 876                 drive = (saved_drive + i + 1) % N_DRIVE;
 877                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
 878                         continue; /* skip closed drives */
 879                 set_fdc(drive);
 880                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
 881                       (0x10 << UNIT(drive))))
 882                         /* switch the motor off again, if it was off to
 883                          * begin with */
 884                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
 885         }
 886         set_fdc(saved_drive);
 887 }
 888 
 889 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 890 
 891 /* this function makes sure that the disk stays in the drive during the
 892  * transfer */
 893 static void fd_watchdog(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 894 {
 895 #ifdef DCL_DEBUG
 896         if (DP->flags & FD_DEBUG){
 897                 DPRINT("calling disk change from watchdog\n");
 898         }
 899 #endif
 900 
 901         if (disk_change(current_drive)){
 902                 DPRINT("disk removed during i/o\n");
 903                 floppy_shutdown();
 904         } else {
 905                 del_timer(&fd_timer);
 906                 fd_timer.function = (timeout_fn) fd_watchdog;
 907                 fd_timer.expires = jiffies + HZ / 10;
 908                 add_timer(&fd_timer);
 909         }
 910 }
 911 
 912 static void main_command_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 913 {
 914         del_timer(&fd_timer);
 915         cont->interrupt();
 916 }
 917 
 918 /* waits for a delay (spinup or select) to pass */
 919 static int wait_for_completion(int delay, timeout_fn function)
     /* [previous][next][first][last][top][bottom][index][help] */
 920 {
 921         if (FDCS->reset){
 922                 reset_fdc(); /* do the reset during sleep to win time
 923                               * if we don't need to sleep, it's a good
 924                               * occasion anyways */
 925                 return 1;
 926         }
 927 
 928         if (jiffies < delay){
 929                 del_timer(&fd_timer);
 930                 fd_timer.function = function;
 931                 fd_timer.expires = delay;
 932                 add_timer(&fd_timer);
 933                 return 1;
 934         }
 935         return 0;
 936 }
 937 
 938 static int hlt_disabled=0;
 939 static void floppy_disable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 940 {
 941         unsigned long flags;
 942         save_flags(flags);
 943         cli();
 944         if (!hlt_disabled){
 945                 hlt_disabled=1;
 946 #ifdef HAVE_DISABLE_HLT
 947                 disable_hlt();
 948 #endif
 949         }
 950         restore_flags(flags);
 951 }
 952 
 953 static void floppy_enable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 954 {
 955         unsigned long flags;
 956         save_flags(flags);
 957         cli();
 958         if (hlt_disabled){
 959                 hlt_disabled=0;
 960 #ifdef HAVE_DISABLE_HLT
 961                 enable_hlt();
 962 #endif
 963         }
 964         restore_flags(flags);
 965 }
 966 
 967 
 968 static void setup_DMA(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 969 {
 970 #ifdef FLOPPY_SANITY_CHECK
 971         if (raw_cmd->length == 0){
 972                 int i;
 973 
 974                 printk("zero dma transfer size:");
 975                 for (i=0; i < raw_cmd->cmd_count; i++)
 976                         printk("%x,", raw_cmd->cmd[i]);
 977                 printk("\n");
 978                 cont->done(0);
 979                 FDCS->reset = 1;
 980                 return;
 981         }
 982         if ((long) raw_cmd->kernel_data % 512){
 983                 printk("non aligned address: %p\n", raw_cmd->kernel_data);
 984                 cont->done(0);
 985                 FDCS->reset=1;
 986                 return;
 987         }
 988         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
 989                 printk("DMA crossing 64-K boundary %p-%p\n",
 990                        raw_cmd->kernel_data,
 991                        raw_cmd->kernel_data + raw_cmd->length);
 992                 cont->done(0);
 993                 FDCS->reset=1;
 994                 return;
 995         }
 996 #endif
 997         cli();
 998         fd_disable_dma();
 999         fd_clear_dma_ff();
1000         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1001                         DMA_MODE_READ : DMA_MODE_WRITE);
1002         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1003         fd_set_dma_count(raw_cmd->length);
1004         fd_enable_dma();
1005         sti();
1006         floppy_disable_hlt();
1007 }
1008 
1009 /* sends a command byte to the fdc */
1010 static int output_byte(char byte)
     /* [previous][next][first][last][top][bottom][index][help] */
1011 {
1012         int counter;
1013         unsigned char status = 0;
1014         unsigned char rstatus;
1015 
1016         if (FDCS->reset)
1017                 return -1;
1018         for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
1019                 rstatus = fd_inb(FD_STATUS);
1020                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1021                 if (!(status & STATUS_READY))
1022                         continue;
1023                 if (status == STATUS_READY){
1024                         fd_outb(byte,FD_DATA);
1025 
1026 #ifdef FLOPPY_SANITY_CHECK
1027                         output_log[output_log_pos].data = byte;
1028                         output_log[output_log_pos].status = rstatus;
1029                         output_log[output_log_pos].jiffies = jiffies;
1030                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1031 #endif
1032                         return 0;
1033                 } else
1034                         break;
1035         }
1036         FDCS->reset = 1;
1037         if (!initialising)
1038                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1039                         byte, status);
1040         return -1;
1041 }
1042 #define LAST_OUT(x) if (output_byte(x)){ reset_fdc();return;}
1043 
1044 /* gets the response from the fdc */
1045 static int result(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1046 {
1047         int i = 0, counter, status = 0;
1048 
1049         if (FDCS->reset)
1050                 return -1;
1051         for (counter = 0; counter < 10000 && !FDCS->reset; counter++) {
1052                 status = fd_inb(FD_STATUS)&
1053                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1054                 if (!(status & STATUS_READY))
1055                         continue;
1056                 if (status == STATUS_READY){
1057 #ifdef FLOPPY_SANITY_CHECK
1058                         resultjiffies = jiffies;
1059                         resultsize = i;
1060 #endif
1061                         return i;
1062                 }
1063                 if (status & STATUS_DMA)
1064                         break;
1065                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1066                         if (i >= MAX_REPLIES) {
1067                                 DPRINT("floppy_stat reply overrun\n");
1068                                 break;
1069                         }
1070                         reply_buffer[i++] = fd_inb(FD_DATA);
1071                 }
1072         }
1073         FDCS->reset = 1;
1074         if (!initialising)
1075                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1076                         status, fdc, i);
1077         return -1;
1078 }
1079 
1080 /* Set perpendicular mode as required, based on data rate, if supported.
1081  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1082  */
1083 static inline void perpendicular_mode(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1084 {
1085         unsigned char perp_mode;
1086 
1087         if (raw_cmd->rate & 0x40){
1088                 switch(raw_cmd->rate & 3){
1089                         case 0:
1090                                 perp_mode=2;
1091                                 break;
1092                         case 3:
1093                                 perp_mode=3;
1094                                 break;
1095                         default:
1096                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1097                                 cont->done(0);
1098                                 FDCS->reset = 1; /* convenient way to return to
1099                                                   * redo without to much hassle (deep
1100                                                   * stack et al. */
1101                                 return;
1102                 }
1103         } else
1104                 perp_mode = 0;
1105 
1106         if (FDCS->perp_mode == perp_mode)
1107                 return;
1108         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1109                 output_byte(FD_PERPENDICULAR);
1110                 output_byte(perp_mode);
1111                 FDCS->perp_mode = perp_mode;
1112         } else if (perp_mode) {
1113                 DPRINT("perpendicular mode not supported by this FDC.\n");
1114         }
1115 } /* perpendicular_mode */
1116 
1117 #define NOMINAL_DTR 500
1118 
1119 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1120  * head load time, and DMA disable flag to values needed by floppy.
1121  *
1122  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1123  * to account for the data rate-based scaling done by the 82072 and 82077
1124  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1125  * 8272a).
1126  *
1127  * Note that changing the data transfer rate has a (probably deleterious)
1128  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1129  * fdc_specify is called again after each data transfer rate
1130  * change.
1131  *
1132  * srt: 1000 to 16000 in microseconds
1133  * hut: 16 to 240 milliseconds
1134  * hlt: 2 to 254 milliseconds
1135  *
1136  * These values are rounded up to the next highest available delay time.
1137  */
1138 static void fdc_specify(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1139 {
1140         unsigned char spec1, spec2;
1141         int srt, hlt, hut;
1142         unsigned long dtr = NOMINAL_DTR;
1143         unsigned long scale_dtr = NOMINAL_DTR;
1144         int hlt_max_code = 0x7f;
1145         int hut_max_code = 0xf;
1146 
1147         if (FDCS->need_configure && FDCS->has_fifo) {
1148                 if (FDCS->reset)
1149                         return;
1150                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1151                 /* TODO: lock this in via LOCK during initialization */
1152                 output_byte(FD_CONFIGURE);
1153                 output_byte(0);
1154                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1155                 output_byte(0);         /* precompensation from track 0 upwards */
1156                 if (FDCS->reset){
1157                         FDCS->has_fifo=0;
1158                         return;
1159                 }
1160                 FDCS->need_configure = 0;
1161                 /*DPRINT("FIFO enabled\n");*/
1162         }
1163 
1164         switch (raw_cmd->rate & 0x03) {
1165                 case 3:
1166                         dtr = 1000;
1167                         break;
1168                 case 1:
1169                         dtr = 300;
1170                         break;
1171                 case 2:
1172                         dtr = 250;
1173                         break;
1174         }
1175 
1176         if (FDCS->version >= FDC_82072) {
1177                 scale_dtr = dtr;
1178                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1179                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1180         }
1181 
1182         /* Convert step rate from microseconds to milliseconds and 4 bits */
1183         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1184         SUPBOUND(srt, 0xf);
1185         INFBOUND(srt, 0);
1186 
1187         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1188         if (hlt < 0x01)
1189                 hlt = 0x01;
1190         else if (hlt > 0x7f)
1191                 hlt = hlt_max_code;
1192 
1193         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1194         if (hut < 0x1)
1195                 hut = 0x1;
1196         else if (hut > 0xf)
1197                 hut = hut_max_code;
1198 
1199         spec1 = (srt << 4) | hut;
1200         spec2 = (hlt << 1);
1201 
1202         /* If these parameters did not change, just return with success */
1203         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1204                 /* Go ahead and set spec1 and spec2 */
1205                 output_byte(FD_SPECIFY);
1206                 output_byte(FDCS->spec1 = spec1);
1207                 output_byte(FDCS->spec2 = spec2);
1208         }
1209 } /* fdc_specify */
1210 
1211 /* Set the FDC's data transfer rate on behalf of the specified drive.
1212  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1213  * of the specify command (i.e. using the fdc_specify function).
1214  */
1215 static int fdc_dtr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1216 {
1217         /* If data rate not already set to desired value, set it. */
1218         if ((raw_cmd->rate & 3) == FDCS->dtr)
1219                 return 0;
1220 
1221         /* Set dtr */
1222         fd_outb(raw_cmd->rate & 3, FD_DCR);
1223 
1224         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1225          * need a stabilization period of several milliseconds to be
1226          * enforced after data rate changes before R/W operations.
1227          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1228          */
1229         FDCS->dtr = raw_cmd->rate & 3;
1230         return(wait_for_completion(jiffies+2*HZ/100,
1231                                    (timeout_fn) floppy_ready));
1232 } /* fdc_dtr */
1233 
1234 static void tell_sector(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1235 {
1236         printk(": track %d, head %d, sector %d, size %d",
1237                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1238 } /* tell_sector */
1239 
1240 
1241 /*
1242  * Ok, this error interpreting routine is called after a
1243  * DMA read/write has succeeded
1244  * or failed, so we check the results, and copy any buffers.
1245  * hhb: Added better error reporting.
1246  * ak: Made this into a separate routine.
1247  */
1248 static int interpret_errors(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1249 {
1250         char bad;
1251 
1252         if (inr!=7) {
1253                 DPRINT("-- FDC reply error");
1254                 FDCS->reset = 1;
1255                 return 1;
1256         }
1257 
1258         /* check IC to find cause of interrupt */
1259         switch (ST0 & ST0_INTR) {
1260                 case 0x40:      /* error occurred during command execution */
1261                         bad = 1;
1262                         if (ST1 & ST1_WP) {
1263                                 DPRINT("Drive is write protected\n");
1264                                 CLEARF(FD_DISK_WRITABLE);
1265                                 cont->done(0);
1266                                 bad = 2;
1267                         } else if (ST1 & ST1_ND) {
1268                                 SETF(FD_NEED_TWADDLE);
1269                         } else if (ST1 & ST1_OR) {
1270                                 if (DP->flags & FTD_MSG)
1271                                         DPRINT("Over/Underrun - retrying\n");
1272                                 bad = 0;
1273                         }else if (*errors >= DP->max_errors.reporting){
1274                                 DPRINT("");
1275                                 if (ST0 & ST0_ECE) {
1276                                         printk("Recalibrate failed!");
1277                                 } else if (ST2 & ST2_CRC) {
1278                                         printk("data CRC error");
1279                                         tell_sector();
1280                                 } else if (ST1 & ST1_CRC) {
1281                                         printk("CRC error");
1282                                         tell_sector();
1283                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1284                                         if (!probing) {
1285                                                 printk("sector not found");
1286                                                 tell_sector();
1287                                         } else
1288                                                 printk("probe failed...");
1289                                 } else if (ST2 & ST2_WC) {      /* seek error */
1290                                         printk("wrong cylinder");
1291                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1292                                         printk("bad cylinder");
1293                                 } else {
1294                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1295                                         tell_sector();
1296                                 }
1297                                 printk("\n");
1298 
1299                         }
1300                         if (ST2 & ST2_WC || ST2 & ST2_BC)
1301                                 /* wrong cylinder => recal */
1302                                 DRS->track = NEED_2_RECAL;
1303                         return bad;
1304                 case 0x80: /* invalid command given */
1305                         DPRINT("Invalid FDC command given!\n");
1306                         cont->done(0);
1307                         return 2;
1308                 case 0xc0:
1309                         DPRINT("Abnormal termination caused by polling\n");
1310                         cont->error();
1311                         return 2;
1312                 default: /* (0) Normal command termination */
1313                         return 0;
1314         }
1315 }
1316 
1317 /*
1318  * This routine is called when everything should be correctly set up
1319  * for the transfer (ie floppy motor is on, the correct floppy is
1320  * selected, and the head is sitting on the right track).
1321  */
1322 static void setup_rw_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1323 {
1324         int i,ready_date,r, flags,dflags;
1325         timeout_fn function;
1326 
1327         flags = raw_cmd->flags;
1328         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1329                 flags |= FD_RAW_INTR;
1330 
1331         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1332                 ready_date = DRS->spinup_date + DP->spinup;
1333                 /* If spinup will take a long time, rerun scandrives
1334                  * again just before spinup completion. Beware that
1335                  * after scandrives, we must again wait for selection.
1336                  */
1337                 if (ready_date > jiffies + DP->select_delay){
1338                         ready_date -= DP->select_delay;
1339                         function = (timeout_fn) floppy_start;
1340                 } else
1341                         function = (timeout_fn) setup_rw_floppy;
1342 
1343                 /* wait until the floppy is spinning fast enough */
1344                 if (wait_for_completion(ready_date,function))
1345                         return;
1346         }
1347         dflags = DRS->flags;
1348 
1349         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1350                 setup_DMA();
1351 
1352         if (flags & FD_RAW_INTR)
1353                 SET_INTR(main_command_interrupt);
1354 
1355         r=0;
1356         for (i=0; i< raw_cmd->cmd_count; i++)
1357                 r|=output_byte(raw_cmd->cmd[i]);
1358 
1359 #ifdef DEBUGT
1360         debugt("rw_command: ");
1361 #endif
1362         if (r){
1363                 reset_fdc();
1364                 return;
1365         }
1366 
1367         if (!(flags & FD_RAW_INTR)){
1368                 inr = result();
1369                 cont->interrupt();
1370         } else if (flags & FD_RAW_NEED_DISK)
1371                 fd_watchdog();
1372 }
1373 
1374 static int blind_seek;
1375 
1376 /*
1377  * This is the routine called after every seek (or recalibrate) interrupt
1378  * from the floppy controller.
1379  */
1380 static void seek_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1381 {
1382 #ifdef DEBUGT
1383         debugt("seek interrupt:");
1384 #endif
1385         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1386                 DPRINT("seek failed\n");
1387                 DRS->track = NEED_2_RECAL;
1388                 cont->error();
1389                 cont->redo();
1390                 return;
1391         }
1392         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1393 #ifdef DCL_DEBUG
1394                 if (DP->flags & FD_DEBUG){
1395                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1396                         DPRINT1("jiffies=%ld\n", jiffies);
1397                 }
1398 #endif
1399                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1400                 DRS->select_date = jiffies;
1401         }
1402         DRS->track = ST1;
1403         floppy_ready();
1404 }
1405 
1406 static void check_wp(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1407 {
1408         if (TESTF(FD_VERIFY)) {
1409                 /* check write protection */
1410                 output_byte(FD_GETSTATUS);
1411                 output_byte(UNIT(current_drive));
1412                 if (result() != 1){
1413                         FDCS->reset = 1;
1414                         return;
1415                 }
1416                 CLEARF(FD_VERIFY);
1417                 CLEARF(FD_NEED_TWADDLE);
1418 #ifdef DCL_DEBUG
1419                 if (DP->flags & FD_DEBUG){
1420                         DPRINT("checking whether disk is write protected\n");
1421                         DPRINT1("wp=%x\n",ST3 & 0x40);
1422                 }
1423 #endif
1424                 if (!(ST3  & 0x40))
1425                         SETF(FD_DISK_WRITABLE);
1426                 else
1427                         CLEARF(FD_DISK_WRITABLE);
1428         }
1429 }
1430 
1431 static void seek_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1432 {
1433         int track;
1434 
1435         blind_seek=0;
1436 
1437 #ifdef DCL_DEBUG
1438         if (DP->flags & FD_DEBUG){
1439                 DPRINT("calling disk change from seek\n");
1440         }
1441 #endif
1442 
1443         if (!TESTF(FD_DISK_NEWCHANGE) &&
1444             disk_change(current_drive) &&
1445             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1446                 /* the media changed flag should be cleared after the seek.
1447                  * If it isn't, this means that there is really no disk in
1448                  * the drive.
1449                  */
1450                 SETF(FD_DISK_CHANGED);
1451                 cont->done(0);
1452                 cont->redo();
1453                 return;
1454         }
1455         if (DRS->track <= NEED_1_RECAL){
1456                 recalibrate_floppy();
1457                 return;
1458         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1459                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1460                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1461                 /* we seek to clear the media-changed condition. Does anybody
1462                  * know a more elegant way, which works on all drives? */
1463                 if (raw_cmd->track)
1464                         track = raw_cmd->track - 1;
1465                 else {
1466                         if (DP->flags & FD_SILENT_DCL_CLEAR){
1467                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1468                                 blind_seek = 1;
1469                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1470                         }
1471                         track = 1;
1472                 }
1473         } else {
1474                 check_wp();
1475                 if (raw_cmd->track != DRS->track &&
1476                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1477                         track = raw_cmd->track;
1478                 else {
1479                         setup_rw_floppy();
1480                         return;
1481                 }
1482         }
1483 
1484         SET_INTR(seek_interrupt);
1485         output_byte(FD_SEEK);
1486         output_byte(UNIT(current_drive));
1487         LAST_OUT(track);
1488 #ifdef DEBUGT
1489         debugt("seek command:");
1490 #endif
1491 }
1492 
1493 static void recal_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1494 {
1495 #ifdef DEBUGT
1496         debugt("recal interrupt:");
1497 #endif
1498         if (inr !=2)
1499                 FDCS->reset = 1;
1500         else if (ST0 & ST0_ECE) {
1501                 switch(DRS->track){
1502                         case NEED_1_RECAL:
1503 #ifdef DEBUGT
1504                                 debugt("recal interrupt need 1 recal:");
1505 #endif
1506                                 /* after a second recalibrate, we still haven't
1507                                  * reached track 0. Probably no drive. Raise an
1508                                  * error, as failing immediately might upset
1509                                  * computers possessed by the Devil :-) */
1510                                 cont->error();
1511                                 cont->redo();
1512                                 return;
1513                         case NEED_2_RECAL:
1514 #ifdef DEBUGT
1515                                 debugt("recal interrupt need 2 recal:");
1516 #endif
1517                                 /* If we already did a recalibrate,
1518                                  * and we are not at track 0, this
1519                                  * means we have moved. (The only way
1520                                  * not to move at recalibration is to
1521                                  * be already at track 0.) Clear the
1522                                  * new change flag */
1523 #ifdef DCL_DEBUG
1524                                 if (DP->flags & FD_DEBUG){
1525                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1526                                 }
1527 #endif
1528 
1529                                 CLEARF(FD_DISK_NEWCHANGE);
1530                                 DRS->select_date = jiffies;
1531                                 /* fall through */
1532                         default:
1533 #ifdef DEBUGT
1534                                 debugt("recal interrupt default:");
1535 #endif
1536                                 /* Recalibrate moves the head by at
1537                                  * most 80 steps. If after one
1538                                  * recalibrate we don't have reached
1539                                  * track 0, this might mean that we
1540                                  * started beyond track 80.  Try
1541                                  * again.  */
1542                                 DRS->track = NEED_1_RECAL;
1543                                 break;
1544                 }
1545         } else
1546                 DRS->track = ST1;
1547         floppy_ready();
1548 }
1549 
1550 /*
1551  * Unexpected interrupt - Print as much debugging info as we can...
1552  * All bets are off...
1553  */
1554 static void unexpected_floppy_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1555 {
1556         int i;
1557         if (initialising)
1558                 return;
1559         if (print_unex){
1560                 DPRINT("unexpected interrupt\n");
1561                 if (inr >= 0)
1562                         for (i=0; i<inr; i++)
1563                                 printk("%d %x\n", i, reply_buffer[i]);
1564         }
1565         while(1){
1566                 output_byte(FD_SENSEI);
1567                 inr=result();
1568                 if (inr != 2)
1569                         break;
1570                 if (print_unex){
1571                         printk("sensei\n");
1572                         for (i=0; i<inr; i++)
1573                                 printk("%d %x\n", i, reply_buffer[i]);
1574                 }
1575         }
1576         FDCS->reset = 1;
1577 }
1578 
1579 static struct tq_struct floppy_tq =
1580 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1581 
1582 /* interrupt handler */
1583 static void floppy_interrupt(int irq, void *dev_id, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
1584 {
1585         void (*handler)(void) = DEVICE_INTR;
1586 
1587         lasthandler = handler;
1588         interruptjiffies = jiffies;
1589 
1590         floppy_enable_hlt();
1591         CLEAR_INTR;
1592         if (fdc >= N_FDC || FDCS->address == -1){
1593                 /* we don't even know which FDC is the culprit */
1594                 printk("DOR0=%x\n", fdc_state[0].dor);
1595                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1596                 printk("handler=%p\n", handler);
1597                 is_alive("bizarre fdc");
1598                 return;
1599         }
1600         inr = result();
1601         if (!handler){
1602                 unexpected_floppy_interrupt();
1603                 is_alive("unexpected");
1604                 return;
1605         }
1606         if (inr == 0){
1607                 do {
1608                         output_byte(FD_SENSEI);
1609                         inr = result();
1610                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1611         }
1612         floppy_tq.routine = (void *)(void *) handler;
1613         queue_task_irq(&floppy_tq, &tq_timer);
1614         is_alive("normal interrupt end");
1615 }
1616 
1617 static void recalibrate_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1618 {
1619 #ifdef DEBUGT
1620         debugt("recalibrate floppy:");
1621 #endif
1622         SET_INTR(recal_interrupt);
1623         output_byte(FD_RECALIBRATE);
1624         LAST_OUT(UNIT(current_drive));
1625 }
1626 
1627 /*
1628  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1629  */
1630 static void reset_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1631 {
1632 #ifdef DEBUGT
1633         debugt("reset interrupt:");
1634 #endif
1635         /* fdc_specify();          reprogram fdc */
1636         result();               /* get the status ready for set_fdc */
1637         if (FDCS->reset) {
1638                 printk("reset set in interrupt, calling %p\n", cont->error);
1639                 cont->error(); /* a reset just after a reset. BAD! */
1640         }
1641         cont->redo();
1642 }
1643 
1644 /*
1645  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1646  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1647  */
1648 static void reset_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1649 {
1650         SET_INTR(reset_interrupt);
1651         FDCS->reset = 0;
1652         reset_fdc_info(0);
1653         if (FDCS->version >= FDC_82077)
1654                 fd_outb(0x80 | (FDCS->dtr &3), FD_STATUS);
1655         else {
1656                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1657                 udelay(FD_RESET_DELAY);
1658                 outb(FDCS->dor, FD_DOR);
1659         }
1660 }
1661 
1662 static void empty(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1663 {
1664 }
1665 
1666 void show_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1667 {
1668         int i;
1669 
1670         printk("\n");
1671         printk("floppy driver state\n");
1672         printk("-------------------\n");
1673         printk("now=%ld last interrupt=%d last called handler=%p\n",
1674                jiffies, interruptjiffies, lasthandler);
1675 
1676 
1677 #ifdef FLOPPY_SANITY_CHECK
1678         printk("timeout_message=%s\n", timeout_message);
1679         printk("last output bytes:\n");
1680         for (i=0; i < OLOGSIZE; i++)
1681                 printk("%2x %2x %ld\n",
1682                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1683                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1684                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1685         printk("last result at %d\n", resultjiffies);
1686         printk("last redo_fd_request at %d\n", lastredo);
1687         for (i=0; i<resultsize; i++){
1688                 printk("%2x ", reply_buffer[i]);
1689         }
1690         printk("\n");
1691 #endif
1692 
1693         printk("status=%x\n", fd_inb(FD_STATUS));
1694         printk("fdc_busy=%d\n", fdc_busy);
1695         if (DEVICE_INTR)
1696                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1697         if (floppy_tq.sync)
1698                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1699         if (fd_timer.prev)
1700                 printk("fd_timer.function=%p\n", fd_timer.function);
1701         if (fd_timeout.prev){
1702                 printk("timer_table=%p\n",fd_timeout.function);
1703                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1704                 printk("now=%ld\n",jiffies);
1705         }
1706         printk("cont=%p\n", cont);
1707         printk("CURRENT=%p\n", CURRENT);
1708         printk("command_status=%d\n", command_status);
1709         printk("\n");
1710 }
1711 
1712 static void floppy_shutdown(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1713 {
1714         if (!initialising)
1715                 show_floppy();
1716         CLEAR_INTR;
1717         floppy_tq.routine = (void *)(void *) empty;
1718         del_timer(&fd_timer);
1719         sti();
1720 
1721         floppy_enable_hlt();
1722         fd_disable_dma();
1723         /* avoid dma going to a random drive after shutdown */
1724 
1725         if (!initialising)
1726                 DPRINT("floppy timeout\n");
1727         FDCS->reset = 1;
1728         if (cont){
1729                 cont->done(0);
1730                 cont->redo(); /* this will recall reset when needed */
1731         } else {
1732                 printk("no cont in shutdown!\n");
1733                 process_fd_request();
1734         }
1735         is_alive("floppy shutdown");
1736 }
1737 /*typedef void (*timeout_fn)(unsigned long);*/
1738 
1739 /* start motor, check media-changed condition and write protection */
1740 static int start_motor(void (*function)(void) )
     /* [previous][next][first][last][top][bottom][index][help] */
1741 {
1742         int mask, data;
1743 
1744         mask = 0xfc;
1745         data = UNIT(current_drive);
1746         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1747                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))){
1748                         set_debugt();
1749                         /* no read since this drive is running */
1750                         DRS->first_read_date = 0;
1751                         /* note motor start time if motor is not yet running */
1752                         DRS->spinup_date = jiffies;
1753                         data |= (0x10 << UNIT(current_drive));
1754                 }
1755         } else
1756                 if (FDCS->dor & (0x10 << UNIT(current_drive)))
1757                         mask &= ~(0x10 << UNIT(current_drive));
1758 
1759         /* starts motor and selects floppy */
1760         del_timer(motor_off_timer + current_drive);
1761         set_dor(fdc, mask, data);
1762 
1763         /* wait_for_completion also schedules reset if needed. */
1764         return(wait_for_completion(DRS->select_date+DP->select_delay,
1765                                    (timeout_fn) function));
1766 }
1767 
1768 static void floppy_ready(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1769 {
1770         CHECK_RESET;
1771         if (start_motor(floppy_ready)) return;
1772         if (fdc_dtr()) return;
1773 
1774 #ifdef DCL_DEBUG
1775         if (DP->flags & FD_DEBUG){
1776                 DPRINT("calling disk change from floppy_ready\n");
1777         }
1778 #endif
1779 
1780         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1781            disk_change(current_drive) &&
1782            !DP->select_delay)
1783                 twaddle(); /* this clears the dcl on certain drive/controller
1784                             * combinations */
1785 
1786         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1787                 perpendicular_mode();
1788                 fdc_specify(); /* must be done here because of hut, hlt ... */
1789                 seek_floppy();
1790         } else
1791                 setup_rw_floppy();
1792 }
1793 
1794 static void floppy_start(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1795 {
1796         reschedule_timeout(CURRENTD, "floppy start", 0);
1797 
1798         scandrives();
1799 #ifdef DCL_DEBUG
1800         if (DP->flags & FD_DEBUG){
1801                 DPRINT("setting NEWCHANGE in floppy_start\n");
1802         }
1803 #endif
1804         SETF(FD_DISK_NEWCHANGE);
1805         floppy_ready();
1806 }
1807 
1808 /*
1809  * ========================================================================
1810  * here ends the bottom half. Exported routines are:
1811  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1812  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1813  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1814  * and set_dor.
1815  * ========================================================================
1816  */
1817 /*
1818  * General purpose continuations.
1819  * ==============================
1820  */
1821 
1822 static void do_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1823 {
1824         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1825         cont = 0;
1826         command_status += 2;
1827         wake_up(&command_done);
1828 }
1829 
1830 static struct cont_t wakeup_cont={
1831         empty,
1832         do_wakeup,
1833         empty,
1834         (done_f)empty
1835 };
1836 
1837 static int wait_til_done(void (*handler)(void), int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
1838 {
1839         int ret;
1840 
1841         floppy_tq.routine = (void *)(void *) handler;
1842         queue_task(&floppy_tq, &tq_timer);
1843 
1844         cli();
1845         while(command_status < 2 && NO_SIGNAL){
1846                 is_alive("wait_til_done");
1847                 if (interruptible)
1848                         interruptible_sleep_on(&command_done);
1849                 else
1850                         sleep_on(&command_done);
1851         }
1852         if (command_status < 2){
1853                 floppy_shutdown();
1854                 sti();
1855                 process_fd_request();
1856                 return -EINTR;
1857         }
1858         sti();
1859 
1860         if (FDCS->reset)
1861                 command_status = FD_COMMAND_ERROR;
1862         if (command_status == FD_COMMAND_OKAY)
1863                 ret=0;
1864         else
1865                 ret=-EIO;
1866         command_status = FD_COMMAND_NONE;
1867         return ret;
1868 }
1869 
1870 static void generic_done(int result)
     /* [previous][next][first][last][top][bottom][index][help] */
1871 {
1872         command_status = result;
1873         cont = &wakeup_cont;
1874 }
1875 
1876 static void generic_success(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1877 {
1878         cont->done(1);
1879 }
1880 
1881 static void generic_failure(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1882 {
1883         cont->done(0);
1884 }
1885 
1886 static void success_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1887 {
1888         generic_success();
1889         cont->redo();
1890 }
1891 
1892 
1893 /*
1894  * formatting and rw support.
1895  * ==========================
1896  */
1897 
1898 static int next_valid_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1899 {
1900         int probed_format;
1901 
1902         probed_format = DRS->probed_format;
1903         while(1){
1904                 if (probed_format >= 8 ||
1905                      !DP->autodetect[probed_format]){
1906                         DRS->probed_format = 0;
1907                         return 1;
1908                 }
1909                 if (floppy_type[DP->autodetect[probed_format]].sect){
1910                         DRS->probed_format = probed_format;
1911                         return 0;
1912                 }
1913                 probed_format++;
1914         }
1915 }
1916 
1917 static void bad_flp_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1918 {
1919         if (probing){
1920                 DRS->probed_format++;
1921                 if (!next_valid_format())
1922                         return;
1923         }
1924         (*errors)++;
1925         INFBOUND(DRWE->badness, *errors);
1926         if (*errors > DP->max_errors.abort)
1927                 cont->done(0);
1928         if (*errors > DP->max_errors.reset)
1929                 FDCS->reset = 1;
1930         else if (*errors > DP->max_errors.recal)
1931                 DRS->track = NEED_2_RECAL;
1932 }
1933 
1934 static void set_floppy(kdev_t device)
     /* [previous][next][first][last][top][bottom][index][help] */
1935 {
1936         if (TYPE(device))
1937                 floppy = TYPE(device) + floppy_type;
1938         else
1939                 floppy = current_type[ DRIVE(device) ];
1940 }
1941 
1942 /*
1943  * formatting and support.
1944  * =======================
1945  */
1946 static void format_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1947 {
1948         switch (interpret_errors()){
1949                 case 1:
1950                         cont->error();
1951                 case 2:
1952                         break;
1953                 case 0:
1954                         cont->done(1);
1955         }
1956         cont->redo();
1957 }
1958 
1959 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
1960 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
1961 #define CT(x) ((x) | 0x40)
1962 static void setup_format_params(int track)
     /* [previous][next][first][last][top][bottom][index][help] */
1963 {
1964         struct fparm {
1965                 unsigned char track,head,sect,size;
1966         } *here = (struct fparm *)floppy_track_buffer;
1967         int il,n;
1968         int count,head_shift,track_shift;
1969 
1970         raw_cmd = &default_raw_cmd;
1971         raw_cmd->track = track;
1972 
1973         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1974                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1975         raw_cmd->rate = floppy->rate & 0x43;
1976         raw_cmd->cmd_count = NR_F;
1977         COMMAND = FM_MODE(floppy,FD_FORMAT);
1978         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
1979         F_SIZECODE = FD_SIZECODE(floppy);
1980         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1981         F_GAP = floppy->fmt_gap;
1982         F_FILL = FD_FILL_BYTE;
1983 
1984         raw_cmd->kernel_data = floppy_track_buffer;
1985         raw_cmd->length = 4 * F_SECT_PER_TRACK;
1986 
1987         /* allow for about 30ms for data transport per track */
1988         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1989 
1990         /* a ``cylinder'' is two tracks plus a little stepping time */
1991         track_shift = 2 * head_shift + 3;
1992 
1993         /* position of logical sector 1 on this track */
1994         n = (track_shift * format_req.track + head_shift * format_req.head)
1995                 % F_SECT_PER_TRACK;
1996 
1997         /* determine interleave */
1998         il = 1;
1999         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2000                 il++;
2001 
2002         /* initialize field */
2003         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2004                 here[count].track = format_req.track;
2005                 here[count].head = format_req.head;
2006                 here[count].sect = 0;
2007                 here[count].size = F_SIZECODE;
2008         }
2009         /* place logical sectors */
2010         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2011                 here[n].sect = count;
2012                 n = (n+il) % F_SECT_PER_TRACK;
2013                 if (here[n].sect) { /* sector busy, find next free sector */
2014                         ++n;
2015                         if (n>= F_SECT_PER_TRACK) {
2016                                 n-=F_SECT_PER_TRACK;
2017                                 while (here[n].sect) ++n;
2018                         }
2019                 }
2020         }
2021 }
2022 
2023 static void redo_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2024 {
2025         buffer_track = -1;
2026         setup_format_params(format_req.track << STRETCH(floppy));
2027         floppy_start();
2028 #ifdef DEBUGT
2029         debugt("queue format request");
2030 #endif
2031 }
2032 
2033 static struct cont_t format_cont={
2034         format_interrupt,
2035         redo_format,
2036         bad_flp_intr,
2037         generic_done };
2038 
2039 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /* [previous][next][first][last][top][bottom][index][help] */
2040 {
2041         int ret;
2042         int drive=DRIVE(device);
2043 
2044         LOCK_FDC(drive,1);
2045         set_floppy(device);
2046         if (!floppy ||
2047             floppy->track > DP->tracks ||
2048             tmp_format_req->track >= floppy->track ||
2049             tmp_format_req->head >= floppy->head ||
2050             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2051             !floppy->fmt_gap) {
2052                 process_fd_request();
2053                 return -EINVAL;
2054         }
2055         format_req = *tmp_format_req;
2056         format_errors = 0;
2057         cont = &format_cont;
2058         errors = &format_errors;
2059         IWAIT(redo_format);
2060         process_fd_request();
2061         return ret;
2062 }
2063 
2064 /*
2065  * Buffer read/write and support
2066  * =============================
2067  */
2068 
2069 /* new request_done. Can handle physical sectors which are smaller than a
2070  * logical buffer */
2071 static void request_done(int uptodate)
     /* [previous][next][first][last][top][bottom][index][help] */
2072 {
2073         int block;
2074 
2075         probing = 0;
2076         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2077 
2078         if (!CURRENT){
2079                 DPRINT("request list destroyed in floppy request done\n");
2080                 return;
2081         }
2082 
2083         if (uptodate){
2084                 /* maintain values for invalidation on geometry
2085                  * change */
2086                 block = current_count_sectors + CURRENT->sector;
2087                 INFBOUND(DRS->maxblock, block);
2088                 if (block > floppy->sect)
2089                         DRS->maxtrack = 1;
2090 
2091                 /* unlock chained buffers */
2092                 while (current_count_sectors && CURRENT &&
2093                        current_count_sectors >= CURRENT->current_nr_sectors){
2094                         current_count_sectors -= CURRENT->current_nr_sectors;
2095                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2096                         CURRENT->sector += CURRENT->current_nr_sectors;
2097                         end_request(1);
2098                 }
2099                 if (current_count_sectors && CURRENT){
2100                         /* "unlock" last subsector */
2101                         CURRENT->buffer += current_count_sectors <<9;
2102                         CURRENT->current_nr_sectors -= current_count_sectors;
2103                         CURRENT->nr_sectors -= current_count_sectors;
2104                         CURRENT->sector += current_count_sectors;
2105                         return;
2106                 }
2107 
2108                 if (current_count_sectors && !CURRENT)
2109                         DPRINT("request list destroyed in floppy request done\n");
2110 
2111         } else {
2112                 if (CURRENT->cmd == WRITE) {
2113                         /* record write error information */
2114                         DRWE->write_errors++;
2115                         if (DRWE->write_errors == 1) {
2116                                 DRWE->first_error_sector = CURRENT->sector;
2117                                 DRWE->first_error_generation = DRS->generation;
2118                         }
2119                         DRWE->last_error_sector = CURRENT->sector;
2120                         DRWE->last_error_generation = DRS->generation;
2121                 }
2122                 end_request(0);
2123         }
2124 }
2125 
2126 /* Interrupt handler evaluating the result of the r/w operation */
2127 static void rw_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2128 {
2129         int nr_sectors, ssize;
2130 
2131         if (!DRS->first_read_date)
2132                 DRS->first_read_date = jiffies;
2133 
2134         nr_sectors = 0;
2135         CODE2SIZE;
2136         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2137                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2138                 (sector_t % floppy->sect) % ssize;
2139 
2140 #ifdef FLOPPY_SANITY_CHECK
2141         if (nr_sectors > current_count_sectors + ssize -
2142              (current_count_sectors + sector_t) % ssize +
2143              sector_t % ssize){
2144                 DPRINT2("long rw: %x instead of %lx\n",
2145                         nr_sectors, current_count_sectors);
2146                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2147                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2148                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2149                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2150                        sector_t, ssize);
2151         }
2152 #endif
2153         INFBOUND(nr_sectors,0);
2154         SUPBOUND(current_count_sectors, nr_sectors);
2155 
2156         switch (interpret_errors()){
2157                 case 2:
2158                         cont->redo();
2159                         return;
2160                 case 1:
2161                         if (!current_count_sectors){
2162                                 cont->error();
2163                                 cont->redo();
2164                                 return;
2165                         }
2166                         break;
2167                 case 0:
2168                         if (!current_count_sectors){
2169                                 cont->redo();
2170                                 return;
2171                         }
2172                         current_type[current_drive] = floppy;
2173                         floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
2174                         break;
2175         }
2176 
2177         if (probing) {
2178                 if (DP->flags & FTD_MSG)
2179                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2180                                 floppy->name,current_drive);
2181                 current_type[current_drive] = floppy;
2182                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2183                 probing = 0;
2184         }
2185 
2186         if (CT(COMMAND) != FD_READ || 
2187              raw_cmd->kernel_data == CURRENT->buffer){
2188                 /* transfer directly from buffer */
2189                 cont->done(1);
2190         } else if (CT(COMMAND) == FD_READ){
2191                 buffer_track = raw_cmd->track;
2192                 buffer_drive = current_drive;
2193                 INFBOUND(buffer_max, nr_sectors + sector_t);
2194         }
2195         cont->redo();
2196 }
2197 
2198 /* Compute maximal contiguous buffer size. */
2199 static int buffer_chain_size(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2200 {
2201         struct buffer_head *bh;
2202         int size;
2203         char *base;
2204 
2205         base = CURRENT->buffer;
2206         size = CURRENT->current_nr_sectors << 9;
2207         bh = CURRENT->bh;
2208 
2209         if (bh){
2210                 bh = bh->b_reqnext;
2211                 while (bh && bh->b_data == base + size){
2212                         size += bh->b_size;
2213                         bh = bh->b_reqnext;
2214                 }
2215         }
2216         return size >> 9;
2217 }
2218 
2219 /* Compute the maximal transfer size */
2220 static int transfer_size(int ssize, int max_sector, int max_size)
     /* [previous][next][first][last][top][bottom][index][help] */
2221 {
2222         SUPBOUND(max_sector, sector_t + max_size);
2223 
2224         /* alignment */
2225         max_sector -= (max_sector % floppy->sect) % ssize;
2226 
2227         /* transfer size, beginning not aligned */
2228         current_count_sectors = max_sector - sector_t ;
2229 
2230         return max_sector;
2231 }
2232 
2233 /*
2234  * Move data from/to the track buffer to/from the buffer cache.
2235  */
2236 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /* [previous][next][first][last][top][bottom][index][help] */
2237 {
2238         int remaining; /* number of transferred 512-byte sectors */
2239         struct buffer_head *bh;
2240         char *buffer, *dma_buffer;
2241         int size;
2242 
2243         max_sector = transfer_size(ssize,
2244                                    minimum(max_sector, max_sector_2),
2245                                    CURRENT->nr_sectors);
2246 
2247         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2248             buffer_max > sector_t + CURRENT->nr_sectors)
2249                 current_count_sectors = minimum(buffer_max - sector_t,
2250                                                 CURRENT->nr_sectors);
2251 
2252         remaining = current_count_sectors << 9;
2253 #ifdef FLOPPY_SANITY_CHECK
2254         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2255             CT(COMMAND) == FD_WRITE){
2256                 DPRINT("in copy buffer\n");
2257                 printk("current_count_sectors=%ld\n", current_count_sectors);
2258                 printk("remaining=%d\n", remaining >> 9);
2259                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2260                 printk("CURRENT->current_nr_sectors=%ld\n",
2261                        CURRENT->current_nr_sectors);
2262                 printk("max_sector=%d\n", max_sector);
2263                 printk("ssize=%d\n", ssize);
2264         }
2265 #endif
2266 
2267         buffer_max = maximum(max_sector, buffer_max);
2268 
2269         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2270 
2271         bh = CURRENT->bh;
2272         size = CURRENT->current_nr_sectors << 9;
2273         buffer = CURRENT->buffer;
2274 
2275         while (remaining > 0){
2276                 SUPBOUND(size, remaining);
2277 #ifdef FLOPPY_SANITY_CHECK
2278                 if (dma_buffer + size >
2279                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2280                     dma_buffer < floppy_track_buffer){
2281                         DPRINT1("buffer overrun in copy buffer %d\n",
2282                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2283                         printk("sector_t=%d buffer_min=%d\n",
2284                                sector_t, buffer_min);
2285                         printk("current_count_sectors=%ld\n",
2286                                current_count_sectors);
2287                         if (CT(COMMAND) == FD_READ)
2288                                 printk("read\n");
2289                         if (CT(COMMAND) == FD_READ)
2290                                 printk("write\n");
2291                         break;
2292                 }
2293                 if (((unsigned long)buffer) % 512)
2294                         DPRINT1("%p buffer not aligned\n", buffer);
2295 #endif
2296                 if (CT(COMMAND) == FD_READ) {
2297                         fd_cacheflush(dma_buffer, size);
2298                         memcpy(buffer, dma_buffer, size);
2299                 } else {
2300                         memcpy(dma_buffer, buffer, size);
2301                         fd_cacheflush(dma_buffer, size);
2302                 }
2303                 remaining -= size;
2304                 if (!remaining)
2305                         break;
2306 
2307                 dma_buffer += size;
2308                 bh = bh->b_reqnext;
2309 #ifdef FLOPPY_SANITY_CHECK
2310                 if (!bh){
2311                         DPRINT("bh=null in copy buffer after copy\n");
2312                         break;
2313                 }
2314 #endif
2315                 size = bh->b_size;
2316                 buffer = bh->b_data;
2317         }
2318 #ifdef FLOPPY_SANITY_CHECK
2319         if (remaining){
2320                 if (remaining > 0)
2321                         max_sector -= remaining >> 9;
2322                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2323         }
2324 #endif
2325 }
2326 
2327 /*
2328  * Formulate a read/write request.
2329  * this routine decides where to load the data (directly to buffer, or to
2330  * tmp floppy area), how much data to load (the size of the buffer, the whole
2331  * track, or a single sector)
2332  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2333  * allocation on the fly, it should be done here. No other part should need
2334  * modification.
2335  */
2336 
2337 static int make_raw_rw_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2338 {
2339         int aligned_sector_t;
2340         int max_sector, max_size, tracksize, ssize;
2341 
2342         set_fdc(DRIVE(CURRENT->rq_dev));
2343 
2344         raw_cmd = &default_raw_cmd;
2345         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2346                 FD_RAW_NEED_SEEK;
2347         raw_cmd->cmd_count = NR_RW;
2348         if (CURRENT->cmd == READ){
2349                 raw_cmd->flags |= FD_RAW_READ;
2350                 COMMAND = FM_MODE(floppy,FD_READ);
2351         } else if (CURRENT->cmd == WRITE){
2352                 raw_cmd->flags |= FD_RAW_WRITE;
2353                 COMMAND = FM_MODE(floppy,FD_WRITE);
2354         } else {
2355                 DPRINT("make_raw_rw_request: unknown command\n");
2356                 return 0;
2357         }
2358 
2359         max_sector = floppy->sect * floppy->head;
2360 
2361         TRACK = CURRENT->sector / max_sector;
2362         sector_t = CURRENT->sector % max_sector;
2363         if (floppy->track && TRACK >= floppy->track)
2364                 return 0;
2365         HEAD = sector_t / floppy->sect;
2366 
2367         if (((floppy->stretch & FD_SWAPSIDES) || TESTF(FD_NEED_TWADDLE)) &&
2368             sector_t < floppy->sect)
2369                 max_sector = floppy->sect;
2370 
2371         /* 2M disks have phantom sectors on the first track */
2372         if ((floppy->rate & FD_2M) && (!TRACK) && (!HEAD)){
2373                 max_sector = 2 * floppy->sect / 3;
2374                 if (sector_t >= max_sector){
2375                         current_count_sectors = minimum(floppy->sect - sector_t,
2376                                                         CURRENT->nr_sectors);
2377                         return 1;
2378                 }
2379                 SIZECODE = 2;
2380         } else
2381                 SIZECODE = FD_SIZECODE(floppy);
2382         raw_cmd->rate = floppy->rate & 0x43;
2383         if ((floppy->rate & FD_2M) &&
2384             (TRACK || HEAD) &&
2385             raw_cmd->rate == 2)
2386                 raw_cmd->rate = 1;
2387 
2388         if (SIZECODE)
2389                 SIZECODE2 = 0xff;
2390         else
2391                 SIZECODE2 = 0x80;
2392         raw_cmd->track = TRACK << STRETCH(floppy);
2393         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2394         GAP = floppy->gap;
2395         CODE2SIZE;
2396         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2397         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2398         tracksize = floppy->sect - floppy->sect % ssize;
2399         if (tracksize < floppy->sect){
2400                 SECT_PER_TRACK ++;
2401                 if (tracksize <= sector_t % floppy->sect)
2402                         SECTOR--;
2403                 while (tracksize <= sector_t % floppy->sect){
2404                         while(tracksize + ssize > floppy->sect){
2405                                 SIZECODE--;
2406                                 ssize >>= 1;
2407                         }
2408                         SECTOR++; SECT_PER_TRACK ++;
2409                         tracksize += ssize;
2410                 }
2411                 max_sector = HEAD * floppy->sect + tracksize;
2412         } else if (!TRACK && !HEAD && !(floppy->rate & FD_2M) && probing)
2413                 max_sector = floppy->sect;
2414 
2415         aligned_sector_t = sector_t - (sector_t % floppy->sect) % ssize;
2416         max_size = CURRENT->nr_sectors;
2417         if ((raw_cmd->track == buffer_track) && 
2418             (current_drive == buffer_drive) &&
2419             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2420                 /* data already in track buffer */
2421                 if (CT(COMMAND) == FD_READ) {
2422                         copy_buffer(1, max_sector, buffer_max);
2423                         return 1;
2424                 }
2425         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2426                 if (CT(COMMAND) == FD_WRITE){
2427                         if (sector_t + CURRENT->nr_sectors > ssize &&
2428                             sector_t + CURRENT->nr_sectors < ssize + ssize)
2429                                 max_size = ssize + ssize;
2430                         else
2431                                 max_size = ssize;
2432                 }
2433                 raw_cmd->flags &= ~FD_RAW_WRITE;
2434                 raw_cmd->flags |= FD_RAW_READ;
2435                 COMMAND = FM_MODE(floppy,FD_READ);
2436         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS) {
2437                 unsigned long dma_limit;
2438                 int direct, indirect;
2439 
2440                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2441                         sector_t;
2442 
2443                 /*
2444                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2445                  * on a 64 bit machine!
2446                  */
2447                 max_size = buffer_chain_size();
2448                 dma_limit = (MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer)) >> 9;
2449                 if ((unsigned long) max_size > dma_limit) {
2450                         max_size = dma_limit;
2451                 }
2452                 /* 64 kb boundaries */
2453                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2454                         max_size = (K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2455                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2456                 /*
2457                  * We try to read tracks, but if we get too many errors, we
2458                  * go back to reading just one sector at a time.
2459                  *
2460                  * This means we should be able to read a sector even if there
2461                  * are other bad sectors on this track.
2462                  */
2463                 if (!direct ||
2464                     (indirect * 2 > direct * 3 &&
2465                      *errors < DP->max_errors.read_track &&
2466                      /*!TESTF(FD_NEED_TWADDLE) &&*/
2467                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2468                         max_size = CURRENT->nr_sectors;
2469                 } else {
2470                         raw_cmd->kernel_data = CURRENT->buffer;
2471                         raw_cmd->length = current_count_sectors << 9;
2472                         if (raw_cmd->length == 0){
2473                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2474                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2475                                         indirect, direct, sector_t);
2476                                 return 0;
2477                         }
2478                         return 2;
2479                 }
2480         }
2481 
2482         if (CT(COMMAND) == FD_READ)
2483                 max_size = max_sector; /* unbounded */
2484 
2485         /* claim buffer track if needed */
2486         if (buffer_track != raw_cmd->track ||  /* bad track */
2487             buffer_drive !=current_drive || /* bad drive */
2488             sector_t > buffer_max ||
2489             sector_t < buffer_min ||
2490             ((CT(COMMAND) == FD_READ ||
2491               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize))&&
2492              max_sector > 2 * max_buffer_sectors + buffer_min &&
2493              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2494             /* not enough space */){
2495                 buffer_track = -1;
2496                 buffer_drive = current_drive;
2497                 buffer_max = buffer_min = aligned_sector_t;
2498         }
2499         raw_cmd->kernel_data = floppy_track_buffer + 
2500                 ((aligned_sector_t-buffer_min)<<9);
2501 
2502         if (CT(COMMAND) == FD_WRITE){
2503                 /* copy write buffer to track buffer.
2504                  * if we get here, we know that the write
2505                  * is either aligned or the data already in the buffer
2506                  * (buffer will be overwritten) */
2507 #ifdef FLOPPY_SANITY_CHECK
2508                 if (sector_t != aligned_sector_t && buffer_track == -1)
2509                         DPRINT("internal error offset !=0 on write\n");
2510 #endif
2511                 buffer_track = raw_cmd->track;
2512                 buffer_drive = current_drive;
2513                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2514         } else
2515                 transfer_size(ssize, max_sector,
2516                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2517 
2518         /* round up current_count_sectors to get dma xfer size */
2519         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2520         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2521         raw_cmd->length <<= 9;
2522 #ifdef FLOPPY_SANITY_CHECK
2523         if ((raw_cmd->length < current_count_sectors << 9) ||
2524             (raw_cmd->kernel_data != CURRENT->buffer &&
2525              CT(COMMAND) == FD_WRITE &&
2526              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2527               aligned_sector_t < buffer_min)) ||
2528             raw_cmd->length % (128 << SIZECODE) ||
2529             raw_cmd->length <= 0 || current_count_sectors <= 0){
2530                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2531                         raw_cmd->length, current_count_sectors);
2532                 if (raw_cmd->kernel_data != CURRENT->buffer)
2533                         printk("addr=%d, length=%ld\n",
2534                                (int) ((raw_cmd->kernel_data - 
2535                                        floppy_track_buffer) >> 9),
2536                                current_count_sectors);
2537                 printk("st=%d ast=%d mse=%d msi=%d\n",
2538                        sector_t, aligned_sector_t, max_sector, max_size);
2539                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2540                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2541                        COMMAND, SECTOR, HEAD, TRACK);
2542                 printk("buffer drive=%d\n", buffer_drive);
2543                 printk("buffer track=%d\n", buffer_track);
2544                 printk("buffer_min=%d\n", buffer_min);
2545                 printk("buffer_max=%d\n", buffer_max);
2546                 return 0;
2547         }
2548 
2549         if (raw_cmd->kernel_data != CURRENT->buffer){
2550                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2551                     current_count_sectors < 0 ||
2552                     raw_cmd->length < 0 ||
2553                     raw_cmd->kernel_data + raw_cmd->length >
2554                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2555                         DPRINT("buffer overrun in schedule dma\n");
2556                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2557                                sector_t, buffer_min,
2558                                raw_cmd->length >> 9);
2559                         printk("current_count_sectors=%ld\n",
2560                                current_count_sectors);
2561                         if (CT(COMMAND) == FD_READ)
2562                                 printk("read\n");
2563                         if (CT(COMMAND) == FD_READ)
2564                                 printk("write\n");
2565                         return 0;
2566                 }
2567         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2568                    current_count_sectors > CURRENT->nr_sectors){
2569                 DPRINT("buffer overrun in direct transfer\n");
2570                 return 0;
2571         } else if (raw_cmd->length < current_count_sectors << 9){
2572                 DPRINT("more sectors than bytes\n");
2573                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2574                 printk("sectors=%ld\n", current_count_sectors);
2575         }
2576         if (raw_cmd->length == 0){
2577                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2578                 return 0;
2579         }
2580 #endif
2581         return 2;
2582 }
2583 
2584 static void redo_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2585 {
2586 #define REPEAT {request_done(0); continue; }
2587         kdev_t device;
2588         int tmp;
2589 
2590         lastredo = jiffies;
2591         if (current_drive < N_DRIVE)
2592                 floppy_off(current_drive);
2593 
2594         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2595                 DPRINT("current not active!\n");
2596                 return;
2597         }
2598 
2599         while(1){
2600                 if (!CURRENT) {
2601                         CLEAR_INTR;
2602                         unlock_fdc();
2603                         return;
2604                 }
2605                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2606                         panic(DEVICE_NAME ": request list destroyed");
2607                 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
2608                         panic(DEVICE_NAME ": block not locked");
2609 
2610                 device = CURRENT->rq_dev;
2611                 set_fdc(DRIVE(device));
2612                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2613 
2614                 set_floppy(device);
2615                 raw_cmd = & default_raw_cmd;
2616                 raw_cmd->flags = 0;
2617                 if (start_motor(redo_fd_request)) return;
2618                 if (test_bit(current_drive, &fake_change) ||
2619                    TESTF(FD_DISK_CHANGED)){
2620                         DPRINT("disk absent or changed during operation\n");
2621                         REPEAT;
2622                 }
2623                 if (!floppy) { /* Autodetection */
2624                         if (!probing){
2625                                 DRS->probed_format = 0;
2626                                 if (next_valid_format()){
2627                                         DPRINT("no autodetectable formats\n");
2628                                         floppy = NULL;
2629                                         REPEAT;
2630                                 }
2631                         }
2632                         probing = 1;
2633                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2634                 } else
2635                         probing = 0;
2636                 errors = & (CURRENT->errors);
2637                 tmp = make_raw_rw_request();
2638                 if (tmp < 2){
2639                         request_done(tmp);
2640                         continue;
2641                 }
2642 
2643                 if (TESTF(FD_NEED_TWADDLE))
2644                         twaddle();
2645                 floppy_tq.routine = (void *)(void *) floppy_start;
2646                 queue_task(&floppy_tq, &tq_timer);
2647 #ifdef DEBUGT
2648                 debugt("queue fd request");
2649 #endif
2650                 return;
2651         }
2652 #undef REPEAT
2653 }
2654 
2655 static struct cont_t rw_cont={
2656         rw_interrupt,
2657         redo_fd_request,
2658         bad_flp_intr,
2659         request_done };
2660 
2661 static struct tq_struct request_tq =
2662 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2663 
2664 static void process_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2665 {
2666         cont = &rw_cont;
2667         queue_task(&request_tq, &tq_timer);
2668 }
2669 
2670 static void do_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2671 {
2672         if (fdc_busy){
2673                 /* fdc busy, this new request will be treated when the
2674                    current one is done */
2675                 is_alive("do fd request, old request running");
2676                 return;
2677         }
2678         lock_fdc(MAXTIMEOUT,0);
2679         process_fd_request();
2680         is_alive("do fd request");
2681 }
2682 
2683 static struct cont_t poll_cont={
2684         success_and_wakeup,
2685         floppy_ready,
2686         generic_failure,
2687         generic_done };
2688 
2689 static int poll_drive(int interruptible, int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2690 {
2691         int ret;
2692         /* no auto-sense, just clear dcl */
2693         raw_cmd = &default_raw_cmd;
2694         raw_cmd->flags= flag;
2695         raw_cmd->track=0;
2696         raw_cmd->cmd_count=0;
2697         cont = &poll_cont;
2698 #ifdef DCL_DEBUG
2699         if (DP->flags & FD_DEBUG){
2700                 DPRINT("setting NEWCHANGE in poll_drive\n");
2701         }
2702 #endif
2703         SETF(FD_DISK_NEWCHANGE);
2704         WAIT(floppy_ready);
2705         return ret;
2706 }
2707 
2708 /*
2709  * User triggered reset
2710  * ====================
2711  */
2712 
2713 static void reset_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2714 {
2715         printk("weird, reset interrupt called\n");
2716 }
2717 
2718 static struct cont_t reset_cont={
2719         reset_intr,
2720         success_and_wakeup,
2721         generic_failure,
2722         generic_done };
2723 
2724 static int user_reset_fdc(int drive, int arg, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
2725 {
2726         int ret;
2727 
2728         ret=0;
2729         LOCK_FDC(drive,interruptible);
2730         if (arg == FD_RESET_ALWAYS)
2731                 FDCS->reset=1;
2732         if (FDCS->reset){
2733                 cont = &reset_cont;
2734                 WAIT(reset_fdc);
2735         }
2736         process_fd_request();
2737         return ret;
2738 }
2739 
2740 /*
2741  * Misc Ioctl's and support
2742  * ========================
2743  */
2744 static int fd_copyout(void *param, const void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2745 {
2746         int ret;
2747 
2748         ECALL(verify_area(VERIFY_WRITE,param,size));
2749         fd_cacheflush(address, size); /* is this necessary ??? */
2750         /* Ralf: Yes; only the l2 cache is completly chipset
2751            controlled */
2752         memcpy_tofs(param,(void *) address, size);
2753         return 0;
2754 }
2755 
2756 static int fd_copyin(void *param, void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2757 {
2758         int ret;
2759 
2760         ECALL(verify_area(VERIFY_READ,param,size));
2761         memcpy_fromfs((void *) address, param, size);
2762         return 0;
2763 }
2764 
2765 #define COPYOUT(x) ECALL(fd_copyout((void *)param, &(x), sizeof(x)))
2766 #define COPYIN(x) ECALL(fd_copyin((void *)param, &(x), sizeof(x)))
2767 
2768 static inline const char *drive_name(int type, int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
2769 {
2770         struct floppy_struct *floppy;
2771 
2772         if (type)
2773                 floppy = floppy_type + type;
2774         else {
2775                 if (UDP->native_format)
2776                         floppy = floppy_type + UDP->native_format;
2777                 else
2778                         return "(null)";
2779         }
2780         if (floppy->name)
2781                 return floppy->name;
2782         else
2783                 return "(null)";
2784 }
2785 
2786 
2787 /* raw commands */
2788 static void raw_cmd_done(int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2789 {
2790         int i;
2791 
2792         if (!flag) {
2793                 raw_cmd->flags = FD_RAW_FAILURE;
2794                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2795         } else {
2796                 raw_cmd->reply_count = inr;
2797                 for (i=0; i< raw_cmd->reply_count; i++)
2798                         raw_cmd->reply[i] = reply_buffer[i];
2799 
2800                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE))
2801                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2802                 
2803                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2804                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2805                         raw_cmd->flags |= FD_RAW_FAILURE;
2806 
2807                 if (disk_change(current_drive))
2808                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2809                 else
2810                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2811                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2812                         motor_off_callback(current_drive);
2813 
2814                 if (raw_cmd->next &&
2815                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2816                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2817                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2818                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2819                         raw_cmd = raw_cmd->next;
2820                         return;
2821                 }
2822         }
2823         generic_done(flag);
2824 }
2825 
2826 
2827 static struct cont_t raw_cmd_cont={
2828         success_and_wakeup,
2829         floppy_start,
2830         generic_failure,
2831         raw_cmd_done
2832 };
2833 
2834 static inline int raw_cmd_copyout(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2835                                   struct floppy_raw_cmd *ptr)
2836 {
2837         struct old_floppy_raw_cmd old_raw_cmd;
2838         int ret;
2839 
2840         while(ptr) {
2841                 if (cmd == OLDFDRAWCMD) {
2842                         old_raw_cmd.flags = ptr->flags;
2843                         old_raw_cmd.data = ptr->data;
2844                         old_raw_cmd.length = ptr->length;
2845                         old_raw_cmd.rate = ptr->rate;
2846                         old_raw_cmd.reply_count = ptr->reply_count;
2847                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2848                         COPYOUT(old_raw_cmd);
2849                         param += sizeof(old_raw_cmd);
2850                 } else {
2851                         COPYOUT(*ptr);
2852                         param += sizeof(struct floppy_raw_cmd);
2853                 }
2854 
2855                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2856                         if (ptr->length>=0 && ptr->length<=ptr->buffer_length)
2857                                 ECALL(fd_copyout(ptr->data, 
2858                                                  ptr->kernel_data, 
2859                                                  ptr->buffer_length - 
2860                                                  ptr->length));
2861                 }
2862                 ptr = ptr->next;
2863         }
2864         return 0;
2865 }
2866 
2867 
2868 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /* [previous][next][first][last][top][bottom][index][help] */
2869 {
2870         struct floppy_raw_cmd *next,*this;
2871 
2872         this = *ptr;
2873         *ptr = 0;
2874         while(this) {
2875                 if (this->buffer_length) {
2876                         free_pages((unsigned long)this->kernel_data,
2877                                    __get_order(this->buffer_length));
2878                         this->buffer_length = 0;
2879                 }
2880                 next = this->next;
2881                 kfree(this);
2882                 this = next;
2883         }
2884 }
2885 
2886 
2887 static inline int raw_cmd_copyin(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2888                                  struct floppy_raw_cmd **rcmd)
2889 {
2890         struct floppy_raw_cmd *ptr;
2891         struct old_floppy_raw_cmd old_raw_cmd;
2892         int ret;
2893         int i;
2894         
2895         *rcmd = 0;
2896         while(1) {
2897                 ptr = (struct floppy_raw_cmd *) 
2898                         kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
2899                 if (!ptr)
2900                         return -ENOMEM;
2901                 *rcmd = ptr;
2902                 if (cmd == OLDFDRAWCMD){
2903                         COPYIN(old_raw_cmd);
2904                         ptr->flags = old_raw_cmd.flags;
2905                         ptr->data = old_raw_cmd.data;
2906                         ptr->length = old_raw_cmd.length;
2907                         ptr->rate = old_raw_cmd.rate;
2908                         ptr->cmd_count = old_raw_cmd.cmd_count;
2909                         ptr->track = old_raw_cmd.track;
2910                         ptr->phys_length = 0;
2911                         ptr->next = 0;
2912                         ptr->buffer_length = 0;
2913                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
2914                         param += sizeof(struct old_floppy_raw_cmd);
2915                         if (ptr->cmd_count > 9)
2916                                 return -EINVAL;
2917                 } else {
2918                         COPYIN(*ptr);
2919                         ptr->next = 0;
2920                         ptr->buffer_length = 0;
2921                         param += sizeof(struct floppy_raw_cmd);
2922                         if (ptr->cmd_count > 16)
2923                                 return -EINVAL;
2924                 }
2925 
2926                 for (i=0; i< 16; i++)
2927                         ptr->reply[i] = 0;
2928                 ptr->resultcode = 0;
2929                 ptr->kernel_data = 0;
2930 
2931                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
2932                         if (ptr->length <= 0)
2933                                 return -EINVAL;
2934                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
2935                         if (!ptr->kernel_data)
2936                                 return -ENOMEM;
2937                         ptr->buffer_length = ptr->length;
2938                 }
2939                 if ( ptr->flags & FD_RAW_READ )
2940                     ECALL( verify_area( VERIFY_WRITE, ptr->data, 
2941                                         ptr->length ));
2942                 if (ptr->flags & FD_RAW_WRITE)
2943                         ECALL(fd_copyin(ptr->data, ptr->kernel_data, 
2944                                         ptr->length));
2945                 rcmd = & (ptr->next);
2946                 if (!(ptr->flags & FD_RAW_MORE))
2947                         return 0;
2948                 ptr->rate &= 0x43;
2949         }
2950 }
2951 
2952 
2953 static int raw_cmd_ioctl(int cmd, void *param)
     /* [previous][next][first][last][top][bottom][index][help] */
2954 {
2955         int drive, ret, ret2;
2956         struct floppy_raw_cmd *my_raw_cmd;
2957 
2958         if (FDCS->rawcmd <= 1)
2959                 FDCS->rawcmd = 1;
2960         for (drive= 0; drive < N_DRIVE; drive++){
2961                 if (FDC(drive) != fdc)
2962                         continue;
2963                 if (drive == current_drive){
2964                         if (UDRS->fd_ref > 1){
2965                                 FDCS->rawcmd = 2;
2966                                 break;
2967                         }
2968                 } else if (UDRS->fd_ref){
2969                         FDCS->rawcmd = 2;
2970                         break;
2971                 }
2972         }
2973 
2974         if (FDCS->reset)
2975                 return -EIO;
2976 
2977         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
2978         if (ret) {
2979                 raw_cmd_free(&my_raw_cmd);
2980                 return ret;
2981         }
2982 
2983         raw_cmd = my_raw_cmd;
2984         cont = &raw_cmd_cont;
2985         ret=wait_til_done(floppy_start,1);
2986 #ifdef DCL_DEBUG
2987         if (DP->flags & FD_DEBUG){
2988                 DPRINT("calling disk change from raw_cmd ioctl\n");
2989         }
2990 #endif
2991 
2992         if (ret != -EINTR && FDCS->reset)
2993                 ret = -EIO;
2994 
2995         DRS->track = NO_TRACK;
2996 
2997         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
2998         if (!ret)
2999                 ret = ret2;
3000         raw_cmd_free(&my_raw_cmd);
3001         return ret;
3002 }
3003 
3004 static int invalidate_drive(kdev_t rdev)
     /* [previous][next][first][last][top][bottom][index][help] */
3005 {
3006         /* invalidate the buffer track to force a reread */
3007         set_bit(DRIVE(rdev), &fake_change);
3008         process_fd_request();
3009         check_disk_change(rdev);
3010         return 0;
3011 }
3012 
3013 
3014 static inline void clear_write_error(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
3015 {
3016         CLEARSTRUCT(UDRWE);
3017 }
3018 
3019 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
     /* [previous][next][first][last][top][bottom][index][help] */
3020                                int drive, int type, kdev_t device)
3021 {
3022         int cnt;
3023 
3024         /* sanity checking for parameters.*/
3025         if (g->sect <= 0 ||
3026             g->head <= 0 ||
3027             g->track <= 0 ||
3028             g->track > UDP->tracks>>STRETCH(g) ||
3029             /* check if reserved bits are set */
3030             (g->stretch&~(FD_STRETCH|FD_SWAPSIDES)) != 0)
3031                 return -EINVAL;
3032         if (type){
3033                 if (!suser())
3034                         return -EPERM;
3035                 LOCK_FDC(drive,1);
3036                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3037                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3038                             drive_state[cnt].fd_ref)
3039                                 set_bit(drive, &fake_change);
3040                 }
3041                 floppy_type[type] = *g;
3042                 floppy_type[type].name="user format";
3043                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3044                         floppy_sizes[cnt]= floppy_sizes[cnt+0x80]=
3045                                 floppy_type[type].size>>1;
3046                 process_fd_request();
3047                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3048                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3049                             drive_state[cnt].fd_ref)
3050                                 check_disk_change(
3051                                         MKDEV(FLOPPY_MAJOR,
3052                                               drive_state[cnt].fd_device));
3053                 }
3054         } else {
3055                 LOCK_FDC(drive,1);
3056                 if (cmd != FDDEFPRM)
3057                         /* notice a disk change immediately, else
3058                          * we loose our settings immediately*/
3059                         CALL(poll_drive(1,0));
3060                 user_params[drive] = *g;
3061                 if (buffer_drive == drive)
3062                         SUPBOUND(buffer_max, user_params[drive].sect);
3063                 current_type[drive] = &user_params[drive];
3064                 floppy_sizes[drive] = user_params[drive].size >> 1;
3065                 if (cmd == FDDEFPRM)
3066                         DRS->keep_data = -1;
3067                 else
3068                         DRS->keep_data = 1;
3069                 /* invalidation. Invalidate only when needed, i.e.
3070                  * when there are already sectors in the buffer cache
3071                  * whose number will change. This is useful, because
3072                  * mtools often changes the geometry of the disk after
3073                  * looking at the boot block */
3074                 if (DRS->maxblock > user_params[drive].sect || DRS->maxtrack)
3075                         invalidate_drive(device);
3076                 else
3077                         process_fd_request();
3078         }
3079         return 0;
3080 }
3081 
3082 /* handle obsolete ioctl's */
3083 static struct translation_entry {
3084     int newcmd;
3085     int oldcmd;
3086     int oldsize; /* size of 0x00xx-style ioctl. Reflects old structures, thus
3087                   * use numeric values. NO SIZEOFS */
3088 } translation_table[]= {
3089     {FDCLRPRM,           0,  0},
3090     {FDSETPRM,           1, 28},
3091     {FDDEFPRM,           2, 28},
3092     {FDGETPRM,           3, 28},
3093     {FDMSGON,            4,  0},
3094     {FDMSGOFF,           5,  0},
3095     {FDFMTBEG,           6,  0},
3096     {FDFMTTRK,           7, 12},
3097     {FDFMTEND,           8,  0},
3098     {FDSETEMSGTRESH,    10,  0},
3099     {FDFLUSH,           11,  0},
3100     {FDSETMAXERRS,      12, 20},
3101     {OLDFDRAWCMD,       30,  0},
3102     {FDGETMAXERRS,      14, 20},
3103     {FDGETDRVTYP,       16, 16},
3104     {FDSETDRVPRM,       20, 88},
3105     {FDGETDRVPRM,       21, 88},
3106     {FDGETDRVSTAT,      22, 52},
3107     {FDPOLLDRVSTAT,     23, 52},
3108     {FDRESET,           24,  0},
3109     {FDGETFDCSTAT,      25, 40},
3110     {FDWERRORCLR,       27,  0},
3111     {FDWERRORGET,       28, 24},
3112     {FDRAWCMD,           0,  0},
3113     {FDTWADDLE,         40,  0} };
3114 
3115 static inline int normalize_0x02xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3116 {
3117         int i;
3118 
3119         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3120                 if ((*cmd & 0xffff) == (translation_table[i].newcmd & 0xffff)){
3121                         *size = _IOC_SIZE(*cmd);
3122                         *cmd = translation_table[i].newcmd;
3123                         if (*size > _IOC_SIZE(*cmd)) {
3124                                 printk("ioctl not yet supported\n");
3125                                 return -EFAULT;
3126                         }
3127                         return 0;
3128                 }
3129         }
3130         return -EINVAL;
3131 }
3132 
3133 static inline int xlate_0x00xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3134 {
3135         int i;
3136         /* old ioctls' for kernels <= 1.3.33 */
3137         /* When the next even release will come around, we'll start
3138          * warning against these.
3139          * When the next odd release will come around, we'll fail with
3140          * -EINVAL */
3141         if(strcmp(system_utsname.version, "1.4.0") >= 0)
3142                 printk("obsolete floppy ioctl %x\n", *cmd);
3143         if((system_utsname.version[0] == '1' &&
3144             strcmp(system_utsname.version, "1.5.0") >= 0) ||
3145            (system_utsname.version[0] >= '2' &&
3146             strcmp(system_utsname.version, "2.1.0") >= 0))
3147                 return -EINVAL;
3148         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3149                 if (*cmd == translation_table[i].oldcmd) {
3150                         *size = translation_table[i].oldsize;
3151                         *cmd = translation_table[i].newcmd;
3152                         return 0;
3153                 }
3154         }
3155         return -EINVAL;
3156 }
3157 
3158 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /* [previous][next][first][last][top][bottom][index][help] */
3159                     unsigned long param)
3160 {
3161 #define IOCTL_MODE_BIT 8
3162 #define OPEN_WRITE_BIT 16
3163 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3164 #define OUT(c,x) case c: outparam = (const char *) (x); break
3165 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3166 
3167         int i,drive,type;
3168         kdev_t device;
3169         int ret;
3170         int size;
3171         union inparam {
3172                 struct floppy_struct g; /* geometry */
3173                 struct format_descr f;
3174                 struct floppy_max_errors max_errors;
3175                 struct floppy_drive_params dp;
3176         } inparam; /* parameters coming from user space */
3177         const char *outparam; /* parameters passed back to user space */
3178 
3179         device = inode->i_rdev;
3180         switch (cmd) {
3181                 RO_IOCTLS(device,param);
3182         }
3183         type = TYPE(device);
3184         drive = DRIVE(device);
3185 
3186         /* convert the old style command into a new style command */
3187         if ((cmd & 0xff00) == 0x0200) {
3188                 ECALL(normalize_0x02xx_ioctl(&cmd, &size));
3189         } else if ((cmd & 0xff00) == 0x0000) {
3190                 ECALL(xlate_0x00xx_ioctl(&cmd, &size));
3191         } else
3192                 return -EINVAL;
3193 
3194         /* permission checks */
3195         if (((cmd & 0x80) && !suser()) ||
3196              ((cmd & 0x40) && !IOCTL_ALLOWED))
3197                 return -EPERM;
3198 
3199         /* verify writability of result, and fail early */
3200         if (_IOC_DIR(cmd) & _IOC_READ)
3201                 ECALL(verify_area(VERIFY_WRITE,(void *) param, size));
3202                 
3203         /* copyin */
3204         CLEARSTRUCT(&inparam);
3205         if (_IOC_DIR(cmd) & _IOC_WRITE)
3206                 ECALL(fd_copyin((void *)param, &inparam, size))
3207 
3208         switch (cmd) {
3209                 case FDCLRPRM:
3210                         LOCK_FDC(drive,1);
3211                         current_type[drive] = NULL;
3212                         floppy_sizes[drive] = MAX_DISK_SIZE;
3213                         UDRS->keep_data = 0;
3214                         return invalidate_drive(device);
3215                 case FDSETPRM:
3216                 case FDDEFPRM:
3217                         return set_geometry(cmd, & inparam.g,
3218                                             drive, type, device);
3219                 case FDGETPRM:
3220                         if (type)
3221                                 outparam = (char *) &floppy_type[type];
3222                         else 
3223                                 outparam = (char *) current_type[drive];
3224                         if(!outparam)
3225                                 return -ENODEV;
3226                         break;
3227 
3228                 case FDMSGON:
3229                         UDP->flags |= FTD_MSG;
3230                         return 0;
3231                 case FDMSGOFF:
3232                         UDP->flags &= ~FTD_MSG;
3233                         return 0;
3234 
3235                 case FDFMTBEG:
3236                         LOCK_FDC(drive,1);
3237                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3238                         ret = UDRS->flags;
3239                         process_fd_request();
3240                         if(ret & FD_VERIFY)
3241                                 return -ENODEV;
3242                         if(!(ret & FD_DISK_WRITABLE))
3243                                 return -EROFS;
3244                         return 0;
3245                 case FDFMTTRK:
3246                         if (UDRS->fd_ref != 1)
3247                                 return -EBUSY;
3248                         return do_format(device, &inparam.f);
3249                 case FDFMTEND:
3250                 case FDFLUSH:
3251                         LOCK_FDC(drive,1);
3252                         return invalidate_drive(device);
3253 
3254                 case FDSETEMSGTRESH:
3255                         UDP->max_errors.reporting =
3256                                 (unsigned short) (param & 0x0f);
3257                         return 0;
3258                 OUT(FDGETMAXERRS, &UDP->max_errors);
3259                 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3260 
3261                 case FDGETDRVTYP:
3262                         outparam = drive_name(type,drive);
3263                         SUPBOUND(size,strlen(outparam)+1);
3264                         break;
3265 
3266                 IN(FDSETDRVPRM, UDP, dp);
3267                 OUT(FDGETDRVPRM, UDP);
3268 
3269                 case FDPOLLDRVSTAT:
3270                         LOCK_FDC(drive,1);
3271                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3272                         process_fd_request();
3273                         /* fall through */
3274                 OUT(FDGETDRVSTAT, UDRS);
3275 
3276                 case FDRESET:
3277                         return user_reset_fdc(drive, (int)param, 1);
3278 
3279                 OUT(FDGETFDCSTAT,UFDCS);
3280 
3281                 case FDWERRORCLR:
3282                         CLEARSTRUCT(UDRWE);
3283                         return 0;
3284                 OUT(FDWERRORGET,UDRWE);
3285 
3286                 case OLDFDRAWCMD:
3287                 case FDRAWCMD:
3288                         if (type)
3289                                 return -EINVAL;
3290                         LOCK_FDC(drive,1);
3291                         set_floppy(device);
3292                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3293                         process_fd_request();
3294                         return i;
3295 
3296                 case FDTWADDLE:
3297                         LOCK_FDC(drive,1);
3298                         twaddle();
3299                         process_fd_request();
3300                         return 0;
3301 
3302                 default:
3303                         return -EINVAL;
3304         }
3305 
3306         if (_IOC_DIR(cmd) & _IOC_READ)
3307                 return fd_copyout((void *)param, outparam, size);
3308         else
3309                 return 0;
3310 #undef IOCTL_ALLOWED
3311 #undef OUT
3312 #undef IN
3313 }
3314 
3315 static void config_types(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3316 {
3317         int first=1;
3318         int drive;
3319 
3320         /* read drive info out of physical cmos */
3321         drive=0;
3322         if (!UDP->cmos)
3323                 UDP->cmos= FLOPPY0_TYPE;
3324         drive=1;
3325         if (!UDP->cmos && FLOPPY1_TYPE)
3326                 UDP->cmos = FLOPPY1_TYPE;
3327 
3328         /* XXX */
3329         /* additional physical CMOS drive detection should go here */
3330 
3331         for (drive=0; drive < N_DRIVE; drive++){
3332                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3333                         memcpy((char *) UDP,
3334                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3335                                sizeof(struct floppy_drive_params));
3336                 if (UDP->cmos){
3337                         if (first)
3338                                 printk("Floppy drive(s): ");
3339                         else
3340                                 printk(", ");
3341                         first=0;
3342                         if (UDP->cmos > 0){
3343                                 allowed_drive_mask |= 1 << drive;
3344                                 printk("fd%d is %s", drive,
3345                                        default_drive_params[(int)UDP->cmos].name);
3346                         } else
3347                                 printk("fd%d is unknown type %d",drive,
3348                                        UDP->cmos);
3349                 }
3350         }
3351         if (!first)
3352                 printk("\n");
3353 }
3354 
3355 static int floppy_read(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3356                        char * buf, int count)
3357 {
3358         int drive = DRIVE(inode->i_rdev);
3359 
3360         check_disk_change(inode->i_rdev);
3361         if (UTESTF(FD_DISK_CHANGED))
3362                 return -ENXIO;
3363         return block_read(inode, filp, buf, count);
3364 }
3365 
3366 static int floppy_write(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3367                         const char * buf, int count)
3368 {
3369         int block;
3370         int ret;
3371         int drive = DRIVE(inode->i_rdev);
3372 
3373         if (!UDRS->maxblock)
3374                 UDRS->maxblock=1;/* make change detectable */
3375         check_disk_change(inode->i_rdev);
3376         if (UTESTF(FD_DISK_CHANGED))
3377                 return -ENXIO;
3378         if (!UTESTF(FD_DISK_WRITABLE))
3379                 return -EROFS;
3380         block = (filp->f_pos + count) >> 9;
3381         INFBOUND(UDRS->maxblock, block);
3382         ret= block_write(inode, filp, buf, count);
3383         return ret;
3384 }
3385 
3386 static void floppy_release(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3387 {
3388         int drive;
3389 
3390         drive = DRIVE(inode->i_rdev);
3391 
3392         if (!filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3393                 /* if the file is mounted OR (writable now AND writable at
3394                  * open time) Linus: Does this cover all cases? */
3395                 block_fsync(inode,filp);
3396 
3397         if (UDRS->fd_ref < 0)
3398                 UDRS->fd_ref=0;
3399         else if (!UDRS->fd_ref--) {
3400                 DPRINT("floppy_release with fd_ref == 0");
3401                 UDRS->fd_ref = 0;
3402         }
3403         floppy_release_irq_and_dma();
3404 }
3405 
3406 /*
3407  * floppy_open check for aliasing (/dev/fd0 can be the same as
3408  * /dev/PS0 etc), and disallows simultaneous access to the same
3409  * drive with different device numbers.
3410  */
3411 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3412 
3413 static int floppy_open(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3414 {
3415         int drive;
3416         int old_dev;
3417         int try;
3418         char *tmp;
3419 
3420         if (!filp) {
3421                 DPRINT("Weird, open called with filp=0\n");
3422                 return -EIO;
3423         }
3424 
3425         drive = DRIVE(inode->i_rdev);
3426         if (drive >= N_DRIVE ||
3427             !(allowed_drive_mask & (1 << drive)) ||
3428             fdc_state[FDC(drive)].version == FDC_NONE)
3429                 return -ENXIO;
3430 
3431         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3432                 return -ENXIO;
3433         old_dev = UDRS->fd_device;
3434         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3435                 return -EBUSY;
3436 
3437         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3438                 USETF(FD_DISK_CHANGED);
3439                 USETF(FD_VERIFY);
3440         }
3441 
3442         if (UDRS->fd_ref == -1 ||
3443            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3444                 return -EBUSY;
3445 
3446         if (floppy_grab_irq_and_dma())
3447                 return -EBUSY;
3448 
3449         if (filp->f_flags & O_EXCL)
3450                 UDRS->fd_ref = -1;
3451         else
3452                 UDRS->fd_ref++;
3453 
3454         if (!floppy_track_buffer){
3455                 /* if opening an ED drive, reserve a big buffer,
3456                  * else reserve a small one */
3457                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3458                         try = 64; /* Only 48 actually useful */
3459                 else
3460                         try = 32; /* Only 24 actually useful */
3461 
3462                 tmp=(char *)dma_mem_alloc(1024 * try);
3463                 if (!tmp) {
3464                         try >>= 1; /* buffer only one side */
3465                         INFBOUND(try, 16);
3466                         tmp= (char *)dma_mem_alloc(1024*try);
3467                 }
3468                 if (!tmp) {
3469                         DPRINT("Unable to allocate DMA memory\n");
3470                         RETERR(ENXIO);
3471                 }
3472                 if (floppy_track_buffer){
3473                         free_pages((unsigned long)tmp,__get_order(try*1024));
3474                 }else {
3475                         buffer_min = buffer_max = -1;
3476                         floppy_track_buffer = tmp;
3477                         max_buffer_sectors = try;
3478                 }
3479         }
3480 
3481         UDRS->fd_device = MINOR(inode->i_rdev);
3482         if (old_dev != -1 && old_dev != MINOR(inode->i_rdev)) {
3483                 if (buffer_drive == drive)
3484                         buffer_track = -1;
3485                 invalidate_buffers(MKDEV(FLOPPY_MAJOR,old_dev));
3486         }
3487 
3488         /* Allow ioctls if we have write-permissions even if read-only open */
3489         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3490                 filp->f_mode |= IOCTL_MODE_BIT;
3491         if (filp->f_mode & 2)
3492                 filp->f_mode |= OPEN_WRITE_BIT;
3493 
3494         if (UFDCS->rawcmd == 1)
3495                 UFDCS->rawcmd = 2;
3496 
3497         if (filp->f_flags & O_NDELAY)
3498                 return 0;
3499         if (filp->f_mode & 3) {
3500                 UDRS->last_checked = 0;
3501                 check_disk_change(inode->i_rdev);
3502                 if (UTESTF(FD_DISK_CHANGED))
3503                         RETERR(ENXIO);
3504         }
3505         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3506                 RETERR(EROFS);
3507         return 0;
3508 #undef RETERR
3509 }
3510 
3511 /*
3512  * Check if the disk has been changed or if a change has been faked.
3513  */
3514 static int check_floppy_change(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3515 {
3516         int drive = DRIVE(dev);
3517 
3518         if (MAJOR(dev) != MAJOR_NR) {
3519                 DPRINT("check_floppy_change: not a floppy\n");
3520                 return 0;
3521         }
3522 
3523         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3524                 return 1;
3525 
3526         if (UDRS->last_checked + UDP->checkfreq < jiffies){
3527                 lock_fdc(drive,0);
3528                 poll_drive(0,0);
3529                 process_fd_request();
3530         }
3531 
3532         if (UTESTF(FD_DISK_CHANGED) ||
3533            UTESTF(FD_VERIFY) ||
3534            test_bit(drive, &fake_change) ||
3535            (!TYPE(dev) && !current_type[drive]))
3536                 return 1;
3537         return 0;
3538 }
3539 
3540 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3541  * the bootblock (block 0). "Autodetection" is also needed to check whether
3542  * there is a disk in the drive at all... Thus we also do it for fixed
3543  * geometry formats */
3544 static int floppy_revalidate(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3545 {
3546 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3547         struct buffer_head * bh;
3548         int drive=DRIVE(dev);
3549         int cf;
3550 
3551         if (UTESTF(FD_DISK_CHANGED) ||
3552            UTESTF(FD_VERIFY) ||
3553            test_bit(drive, &fake_change) ||
3554            NO_GEOM){
3555                 lock_fdc(drive,0);
3556                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3557                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)){
3558                         process_fd_request(); /*already done by another thread*/
3559                         return 0;
3560                 }
3561                 UDRS->maxblock = 0;
3562                 UDRS->maxtrack = 0;
3563                 if (buffer_drive == drive)
3564                         buffer_track = -1;
3565                 clear_bit(drive, &fake_change);
3566                 UCLEARF(FD_DISK_CHANGED);
3567                 if (cf)
3568                         UDRS->generation++;
3569                 if (NO_GEOM){
3570                         /* auto-sensing */
3571                         int size = floppy_blocksizes[MINOR(dev)];
3572                         if (!size)
3573                                 size = 1024;
3574                         if (!(bh = getblk(dev,0,size))){
3575                                 process_fd_request();
3576                                 return 1;
3577                         }
3578                         if (bh && !buffer_uptodate(bh))
3579                                 ll_rw_block(READ, 1, &bh);
3580                         process_fd_request();
3581                         wait_on_buffer(bh);
3582                         brelse(bh);
3583                         return 0;
3584                 }
3585                 if (cf)
3586                         poll_drive(0, FD_RAW_NEED_DISK);
3587                 process_fd_request();
3588         }
3589         return 0;
3590 }
3591 
3592 static struct file_operations floppy_fops = {
3593         NULL,                   /* lseek - default */
3594         floppy_read,            /* read - general block-dev read */
3595         floppy_write,           /* write - general block-dev write */
3596         NULL,                   /* readdir - bad */
3597         NULL,                   /* select */
3598         fd_ioctl,               /* ioctl */
3599         NULL,                   /* mmap */
3600         floppy_open,            /* open */
3601         floppy_release,         /* release */
3602         block_fsync,            /* fsync */
3603         NULL,                   /* fasync */
3604         check_floppy_change,    /* media_change */
3605         floppy_revalidate,      /* revalidate */
3606 };
3607 
3608 /*
3609  * Floppy Driver initialisation
3610  * =============================
3611  */
3612 
3613 /* Determine the floppy disk controller type */
3614 /* This routine was written by David C. Niemi */
3615 static char get_fdc_version(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3616 {
3617         int r;
3618 
3619         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3620         if (FDCS->reset)
3621                 return FDC_NONE;
3622         if ((r = result()) <= 0x00)
3623                 return FDC_NONE;        /* No FDC present ??? */
3624         if ((r==1) && (reply_buffer[0] == 0x80)){
3625                 printk("FDC %d is a 8272A\n",fdc);
3626                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3627         }
3628         if (r != 10) {
3629                 printk("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3630                        fdc, r);
3631                 return FDC_UNKNOWN;
3632         }
3633         output_byte(FD_VERSION);
3634         r = result();
3635         if ((r == 1) && (reply_buffer[0] == 0x80)){
3636                 printk("FDC %d is a 82072\n",fdc);
3637                 return FDC_82072;               /* 82072 doesn't know VERSION */
3638         }
3639         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3640                 printk("FDC %d init: VERSION: unexpected return of %d bytes.\n",
3641                        fdc, r);
3642                 return FDC_UNKNOWN;
3643         }
3644         output_byte(FD_UNLOCK);
3645         r = result();
3646         if ((r == 1) && (reply_buffer[0] == 0x80)){
3647                 printk("FDC %d is a pre-1991 82077\n", fdc);
3648                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3649         }
3650         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3651                 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3652                        fdc, r);
3653                 return FDC_UNKNOWN;
3654         }
3655         output_byte(FD_PARTID);
3656         r = result();
3657         if (r != 1) {
3658                 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3659                        fdc, r);
3660                 return FDC_UNKNOWN;
3661         }
3662         if (reply_buffer[0] == 0x80) {
3663                 printk("FDC %d is a post-1991 82077\n",fdc);
3664                 return FDC_82077;       /* Revised 82077AA passes all the tests */
3665         }
3666         switch (reply_buffer[0] >> 5) {
3667                 case 0x0:
3668                         output_byte(FD_SAVE);
3669                         r = result();
3670                         if (r != 16) {
3671                                 printk("FDC %d init: SAVE: unexpected return of %d bytes.\n", fdc, r);
3672                                 return FDC_UNKNOWN;
3673                         }
3674                         if (!(reply_buffer[0] & 0x40)) {
3675                                 printk("FDC %d is a 3Volt 82078SL.\n",fdc);
3676                                 return FDC_82078;
3677                         }
3678                         /* Either a 82078-1 or a 82078SL running at 5Volt */
3679                         printk("FDC %d is a 82078-1.\n",fdc);
3680                         return FDC_82078_1;
3681                 case 0x1:
3682                         printk("FDC %d is a 44pin 82078\n",fdc);
3683                         return FDC_82078;
3684                 case 0x2:
3685                         printk("FDC %d is a S82078B\n", fdc);
3686                         return FDC_S82078B;
3687                 case 0x3:
3688                         printk("FDC %d is a National Semiconductor PC87306\n", fdc);
3689                         return FDC_87306;
3690                 default:
3691                         printk("FDC %d init: 82077 variant with PARTID=%d.\n",
3692                                fdc, reply_buffer[0] >> 5);
3693                         return FDC_82077_UNKN;
3694         }
3695 } /* get_fdc_version */
3696 
3697 /* lilo configuration */
3698 
3699 /* we make the invert_dcl function global. One day, somebody might
3700  * want to centralize all thinkpad related options into one lilo option,
3701  * there are just so many thinkpad related quirks! */
3702 void floppy_invert_dcl(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3703 {
3704         int i;
3705 
3706         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3707                 if (param)
3708                         default_drive_params[i].params.flags |= 0x80;
3709                 else
3710                         default_drive_params[i].params.flags &= ~0x80;
3711         }
3712         DPRINT("Configuring drives for inverted dcl\n");
3713 }
3714 
3715 static void daring(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3716 {
3717         int i;
3718 
3719         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3720                 if (param){
3721                         default_drive_params[i].params.select_delay = 0;
3722                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3723                 } else {
3724                         default_drive_params[i].params.select_delay = 2*HZ/100;
3725                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3726                 }
3727         }
3728         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3729 }
3730 
3731 static void allow_drives(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3732 {
3733         allowed_drive_mask=param;
3734         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3735 }
3736 
3737 static void fdc2_adr(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3738 {
3739         FDC2 = param;
3740         if (param)
3741                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3742         else
3743                 DPRINT("disabling second fdc\n");
3744 }
3745 
3746 static void unex(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3747 {
3748         print_unex = param;
3749         DPRINT1("%sprinting messages for unexpected interrupts\n",
3750                 param ? "" : "not ");
3751 }
3752 
3753 static void set_cmos(int *ints, int dummy)
     /* [previous][next][first][last][top][bottom][index][help] */
3754 {
3755         int current_drive=0;
3756 
3757         if (ints[0] != 2){
3758                 DPRINT("wrong number of parameter for cmos\n");
3759                 return;
3760         }
3761         current_drive = ints[1];
3762         if (current_drive < 0 || current_drive >= 8){
3763                 DPRINT("bad drive for set_cmos\n");
3764                 return;
3765         }
3766         if (current_drive >= 4 && !FDC2)
3767                 fdc2_adr(0, 0x370);
3768         if (ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3769                 DPRINT1("bad cmos code %d\n", ints[2]);
3770                 return;
3771         }
3772         DP->cmos = ints[2];
3773         DPRINT1("setting cmos code to %d\n", ints[2]);
3774 }
3775 
3776 static struct param_table {
3777         const char *name;
3778         void (*fn)(int *ints, int param);
3779         int def_param;
3780 } config_params[]={
3781         { "allowed_drive_mask", allow_drives, 0xff },
3782         { "all_drives", allow_drives, 0xff },
3783         { "asus_pci", allow_drives, 0x33 },
3784 
3785         { "daring", daring, 1},
3786 
3787         { "two_fdc", fdc2_adr, 0x370 },
3788         { "one_fdc", fdc2_adr, 0 },
3789 
3790         { "thinkpad", floppy_invert_dcl, 1 },
3791 
3792         { "cmos", set_cmos, 0 },
3793 
3794         { "unexpected_interrupts", unex, 1 },
3795         { "no_unexpected_interrupts", unex, 0 },
3796         { "L40SX", unex, 0 } };
3797 
3798 #define FLOPPY_SETUP
3799 void floppy_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
3800 {
3801         int i;
3802         int param;
3803         if (str)
3804                 for (i=0; i< ARRAY_SIZE(config_params); i++){
3805                         if (strcmp(str,config_params[i].name) == 0){
3806                                 if (ints[0])
3807                                         param = ints[1];
3808                                 else
3809                                         param = config_params[i].def_param;
3810                                 config_params[i].fn(ints,param);
3811                                 return;
3812                         }
3813                 }
3814         if (str) {
3815                 DPRINT1("unknown floppy option [%s]\n", str);
3816                 
3817                 DPRINT("allowed options are:");
3818                 for (i=0; i< ARRAY_SIZE(config_params); i++)
3819                         printk(" %s",config_params[i].name);
3820                 printk("\n");
3821         } else
3822                 DPRINT("botched floppy option\n");
3823         DPRINT("Read linux/drivers/block/README.fd\n");
3824 }
3825 
3826 int floppy_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3827 {
3828         int i,unit,drive;
3829         int have_no_fdc= -EIO;
3830 
3831         raw_cmd = 0;
3832 
3833         sti();
3834 
3835         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3836                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3837                 return -EBUSY;
3838         }
3839 
3840         for (i=0; i<256; i++)
3841                 if (ITYPE(i))
3842                         floppy_sizes[i] = floppy_type[ITYPE(i)].size >> 1;
3843                 else
3844                         floppy_sizes[i] = MAX_DISK_SIZE;
3845 
3846         blk_size[MAJOR_NR] = floppy_sizes;
3847         blksize_size[MAJOR_NR] = floppy_blocksizes;
3848         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3849         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3850         config_types();
3851 
3852         for (i = 0; i < N_FDC; i++) {
3853                 fdc = i;
3854                 CLEARSTRUCT(FDCS);
3855                 FDCS->dtr = -1;
3856                 FDCS->dor = 0x4;
3857         }
3858 
3859         fdc_state[0].address = FDC1;
3860 #if N_FDC > 1
3861         fdc_state[1].address = FDC2;
3862 #endif
3863 
3864         if (floppy_grab_irq_and_dma()){
3865                 unregister_blkdev(MAJOR_NR,"fd");
3866                 return -EBUSY;
3867         }
3868 
3869         /* initialise drive state */
3870         for (drive = 0; drive < N_DRIVE; drive++) {
3871                 CLEARSTRUCT(UDRS);
3872                 CLEARSTRUCT(UDRWE);
3873                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3874                 UDRS->fd_device = -1;
3875                 floppy_track_buffer = NULL;
3876                 max_buffer_sectors = 0;
3877         }
3878 
3879         for (i = 0; i < N_FDC; i++) {
3880                 fdc = i;
3881                 FDCS->driver_version = FD_DRIVER_VERSION;
3882                 for (unit=0; unit<4; unit++)
3883                         FDCS->track[unit] = 0;
3884                 if (FDCS->address == -1)
3885                         continue;
3886                 FDCS->rawcmd = 2;
3887                 if (user_reset_fdc(-1,FD_RESET_ALWAYS,0)){
3888                         FDCS->address = -1;
3889                         continue;
3890                 }
3891                 /* Try to determine the floppy controller type */
3892                 FDCS->version = get_fdc_version();
3893                 if (FDCS->version == FDC_NONE){
3894                         FDCS->address = -1;
3895                         continue;
3896                 }
3897 
3898                 request_region(FDCS->address, 6, "floppy");
3899                 request_region(FDCS->address+7, 1, "floppy DIR");
3900                 /* address + 6 is reserved, and may be taken by IDE.
3901                  * Unfortunately, Adaptec doesn't know this :-(, */
3902 
3903                 have_no_fdc = 0;
3904                 /* Not all FDCs seem to be able to handle the version command
3905                  * properly, so force a reset for the standard FDC clones,
3906                  * to avoid interrupt garbage.
3907                  */
3908                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3909                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3910         }
3911         fdc=0;
3912         del_timer(&fd_timeout);
3913         current_drive = 0;
3914         floppy_release_irq_and_dma();
3915         initialising=0;
3916         if (have_no_fdc) {
3917                 DPRINT("no floppy controllers found\n");
3918                 unregister_blkdev(MAJOR_NR,"fd");
3919         } else
3920                 virtual_dma_init();
3921         return have_no_fdc;
3922 }
3923 
3924 static int floppy_grab_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3925 {
3926         int i;
3927         cli();
3928         if (usage_count++){
3929                 sti();
3930                 return 0;
3931         }
3932         sti();
3933         MOD_INC_USE_COUNT;
3934         for (i=0; i< N_FDC; i++){
3935                 if (FDCS->address != -1){
3936                         fdc = i;
3937                         reset_fdc_info(1);
3938                         fd_outb(FDCS->dor, FD_DOR);
3939                 }
3940         }
3941         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3942 
3943         if (fd_request_irq()) {
3944                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3945                         FLOPPY_IRQ);
3946                 return -1;
3947         }
3948         if (fd_request_dma()) {
3949                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3950                         FLOPPY_DMA);
3951                 fd_free_irq();
3952                 return -1;
3953         }
3954         for (fdc = 0; fdc < N_FDC; fdc++)
3955                 if (FDCS->address != -1)
3956                         fd_outb(FDCS->dor, FD_DOR);
3957         fdc = 0;
3958         fd_enable_irq();
3959         return 0;
3960 }
3961 
3962 static void floppy_release_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3963 {
3964 #ifdef FLOPPY_SANITY_CHECK
3965         int drive;
3966 #endif
3967         long tmpsize;
3968         void *tmpaddr;
3969 
3970         cli();
3971         if (--usage_count){
3972                 sti();
3973                 return;
3974         }
3975         sti();
3976         MOD_DEC_USE_COUNT;
3977         fd_disable_dma();
3978         fd_free_dma();
3979         fd_disable_irq();
3980         fd_free_irq();
3981 
3982         set_dor(0, ~0, 8);
3983 #if N_FDC > 1
3984         set_dor(1, ~8, 0);
3985 #endif
3986         floppy_enable_hlt();
3987 
3988         if (floppy_track_buffer && max_buffer_sectors) {
3989                 tmpsize = max_buffer_sectors*1024;
3990                 tmpaddr = (void *)floppy_track_buffer;
3991                 floppy_track_buffer = 0;
3992                 max_buffer_sectors = 0;
3993                 buffer_min = buffer_max = -1;
3994                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
3995         }
3996 
3997 #ifdef FLOPPY_SANITY_CHECK
3998         for (drive=0; drive < N_FDC * 4; drive++)
3999                 if (motor_off_timer[drive].next)
4000                         printk("motor off timer %d still active\n", drive);
4001 
4002         if (fd_timeout.next)
4003                 printk("floppy timer still active:%s\n", timeout_message);
4004         if (fd_timer.next)
4005                 printk("auxiliary floppy timer still active\n");
4006         if (floppy_tq.sync)
4007                 printk("task queue still active\n");
4008 #endif
4009 }
4010 
4011 
4012 #ifdef MODULE
4013 
4014 extern char *get_options(char *str, int *ints);
4015 
4016 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /* [previous][next][first][last][top][bottom][index][help] */
4017 {
4018         unsigned long i;
4019         char c;
4020         int j;
4021         int match;
4022         char buffer[100];
4023         int ints[11];
4024         int length = strlen(pattern)+1;
4025 
4026         match=0;
4027         j=1;
4028 
4029         for (i=current->mm->env_start; i< current->mm->env_end; i ++){
4030                 c= get_fs_byte(i);
4031                 if (match){
4032                         if (j==99)
4033                                 c='\0';
4034                         buffer[j] = c;
4035                         if (!c || c == ' ' || c == '\t'){
4036                                 if (j){
4037                                         buffer[j] = '\0';
4038                                         setup(get_options(buffer,ints),ints);
4039                                 }
4040                                 j=0;
4041                         } else
4042                                 j++;
4043                         if (!c)
4044                                 break;
4045                         continue;
4046                 }
4047                 if ((!j && !c) || (j && c == pattern[j-1]))
4048                         j++;
4049                 else
4050                         j=0;
4051                 if (j==length){
4052                         match=1;
4053                         j=0;
4054                 }
4055         }
4056 }
4057 
4058 
4059 #ifdef __cplusplus
4060 extern "C" {
4061 #endif
4062 int init_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4063 {
4064         printk("inserting floppy driver for %s\n", kernel_version);
4065                 
4066         mod_setup("floppy=", floppy_setup);
4067                 
4068         return floppy_init();
4069 }
4070 
4071 void cleanup_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4072 {
4073         int fdc;
4074                 
4075         for (fdc=0; fdc<2; fdc++)
4076                 if (FDCS->address != -1){
4077                         release_region(FDCS->address, 6);
4078                         release_region(FDCS->address+7, 1);
4079         }
4080                 
4081         unregister_blkdev(MAJOR_NR, "fd");
4082 
4083         blk_dev[MAJOR_NR].request_fn = 0;
4084 }
4085 
4086 #ifdef __cplusplus
4087 }
4088 #endif
4089 
4090 #endif
/* [previous][next][first][last][top][bottom][index][help] */