root/drivers/block/floppy.c

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DEFINITIONS

This source file includes following definitions.
  1. __get_order
  2. dma_mem_alloc
  3. TYPE
  4. DRIVE
  5. set_debugt
  6. debugt
  7. is_alive
  8. reschedule_timeout
  9. maximum
  10. minimum
  11. disk_change
  12. is_selected
  13. set_dor
  14. twaddle
  15. reset_fdc_info
  16. set_fdc
  17. lock_fdc
  18. unlock_fdc
  19. motor_off_callback
  20. floppy_off
  21. scandrives
  22. fd_watchdog
  23. main_command_interrupt
  24. wait_for_completion
  25. floppy_disable_hlt
  26. floppy_enable_hlt
  27. setup_DMA
  28. wait_til_ready
  29. output_byte
  30. result
  31. need_more_output
  32. perpendicular_mode
  33. fdc_configure
  34. fdc_specify
  35. fdc_dtr
  36. tell_sector
  37. interpret_errors
  38. setup_rw_floppy
  39. seek_interrupt
  40. check_wp
  41. seek_floppy
  42. recal_interrupt
  43. unexpected_floppy_interrupt
  44. floppy_interrupt
  45. recalibrate_floppy
  46. reset_interrupt
  47. reset_fdc
  48. empty
  49. show_floppy
  50. floppy_shutdown
  51. start_motor
  52. floppy_ready
  53. floppy_start
  54. do_wakeup
  55. wait_til_done
  56. generic_done
  57. generic_success
  58. generic_failure
  59. success_and_wakeup
  60. next_valid_format
  61. bad_flp_intr
  62. set_floppy
  63. format_interrupt
  64. setup_format_params
  65. redo_format
  66. do_format
  67. request_done
  68. rw_interrupt
  69. buffer_chain_size
  70. transfer_size
  71. copy_buffer
  72. make_raw_rw_request
  73. redo_fd_request
  74. process_fd_request
  75. do_fd_request
  76. poll_drive
  77. reset_intr
  78. user_reset_fdc
  79. fd_copyout
  80. fd_copyin
  81. drive_name
  82. raw_cmd_done
  83. raw_cmd_copyout
  84. raw_cmd_free
  85. raw_cmd_copyin
  86. raw_cmd_ioctl
  87. invalidate_drive
  88. clear_write_error
  89. set_geometry
  90. normalize_0x02xx_ioctl
  91. xlate_0x00xx_ioctl
  92. fd_ioctl
  93. config_types
  94. floppy_read
  95. floppy_write
  96. floppy_release
  97. floppy_open
  98. check_floppy_change
  99. floppy_revalidate
  100. get_fdc_version
  101. floppy_invert_dcl
  102. daring
  103. set_cmos
  104. floppy_setup
  105. floppy_init
  106. floppy_grab_irq_and_dma
  107. floppy_release_irq_and_dma
  108. parse_floppy_cfg_string
  109. mod_setup
  110. init_module
  111. 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 dependent
  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/irq.h>
 161 #include <asm/system.h>
 162 #include <asm/io.h>
 163 #include <asm/segment.h>
 164 
 165 static int use_virtual_dma=0; /* virtual DMA for Intel */
 166 static unsigned short virtual_dma_port=0x3f0;
 167 static void floppy_interrupt(int irq, void *dev_id, struct pt_regs * regs);
 168 static int set_dor(int fdc, char mask, char data);
 169 #include <asm/floppy.h>
 170 
 171 
 172 #define MAJOR_NR FLOPPY_MAJOR
 173 
 174 #include <linux/blk.h>
 175 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
 176 
 177 
 178 #ifndef FLOPPY_MOTOR_MASK
 179 #define FLOPPY_MOTOR_MASK 0xf0
 180 #endif
 181 
 182 #ifndef fd_eject
 183 #define fd_eject(x) -EINVAL
 184 #endif
 185 
 186 #ifndef fd_get_dma_residue
 187 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
 188 #endif
 189 
 190 /* Dma Memory related stuff */
 191 
 192 /* Pure 2^n version of get_order */
 193 static inline int __get_order(unsigned long size)
     /* [previous][next][first][last][top][bottom][index][help] */
 194 {
 195         int order;
 196 
 197         size = (size-1) >> (PAGE_SHIFT-1);
 198         order = -1;
 199         do {
 200                 size >>= 1;
 201                 order++;
 202         } while (size);
 203         return order;
 204 }
 205 
 206 static unsigned long dma_mem_alloc(int size)
     /* [previous][next][first][last][top][bottom][index][help] */
 207 {
 208         int order = __get_order(size);
 209 
 210         return __get_dma_pages(GFP_KERNEL,order);
 211 }
 212 
 213 /* End dma memory related stuff */
 214 
 215 static unsigned int fake_change = 0;
 216 static int initialising=1;
 217 
 218 #ifdef __sparc__
 219 /* We hold the FIFO configuration here.  We want to have Polling and
 220  * Implied Seek enabled on Sun controllers.
 221  */
 222 unsigned char fdc_cfg = 0;
 223 #endif
 224 
 225 static inline int TYPE(kdev_t x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 226         return  (MINOR(x)>>2) & 0x1f;
 227 }
 228 static inline int DRIVE(kdev_t x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 229         return (MINOR(x)&0x03) | ((MINOR(x)&0x80) >> 5);
 230 }
 231 #define ITYPE(x) (((x)>>2) & 0x1f)
 232 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 233 #define UNIT(x) ((x) & 0x03)            /* drive on fdc */
 234 #define FDC(x) (((x) & 0x04) >> 2)  /* fdc of drive */
 235 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
 236                                 /* reverse mapping from unit and fdc to drive */
 237 #define DP (&drive_params[current_drive])
 238 #define DRS (&drive_state[current_drive])
 239 #define DRWE (&write_errors[current_drive])
 240 #define FDCS (&fdc_state[fdc])
 241 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 242 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 243 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 244 
 245 #define UDP (&drive_params[drive])
 246 #define UDRS (&drive_state[drive])
 247 #define UDRWE (&write_errors[drive])
 248 #define UFDCS (&fdc_state[FDC(drive)])
 249 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 250 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 251 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 252 
 253 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 254 
 255 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 256 
 257 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 258 
 259 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 260 
 261 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 262 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 263 
 264 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
 265 
 266 /* read/write */
 267 #define COMMAND raw_cmd->cmd[0]
 268 #define DR_SELECT raw_cmd->cmd[1]
 269 #define TRACK raw_cmd->cmd[2]
 270 #define HEAD raw_cmd->cmd[3]
 271 #define SECTOR raw_cmd->cmd[4]
 272 #define SIZECODE raw_cmd->cmd[5]
 273 #define SECT_PER_TRACK raw_cmd->cmd[6]
 274 #define GAP raw_cmd->cmd[7]
 275 #define SIZECODE2 raw_cmd->cmd[8]
 276 #define NR_RW 9
 277 
 278 /* format */
 279 #define F_SIZECODE raw_cmd->cmd[2]
 280 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 281 #define F_GAP raw_cmd->cmd[4]
 282 #define F_FILL raw_cmd->cmd[5]
 283 #define NR_F 6
 284 
 285 /*
 286  * Maximum disk size (in kilobytes). This default is used whenever the
 287  * current disk size is unknown.
 288  * [Now it is rather a minimum]
 289  */
 290 #define MAX_DISK_SIZE 2 /* 3984*/
 291 
 292 #define K_64    0x10000         /* 64KB */
 293 
 294 /*
 295  * globals used by 'result()'
 296  */
 297 #define MAX_REPLIES 17
 298 static unsigned char reply_buffer[MAX_REPLIES];
 299 static int inr; /* size of reply buffer, when called from interrupt */
 300 #define ST0 (reply_buffer[0])
 301 #define ST1 (reply_buffer[1])
 302 #define ST2 (reply_buffer[2])
 303 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 304 #define R_TRACK (reply_buffer[3])
 305 #define R_HEAD (reply_buffer[4])
 306 #define R_SECTOR (reply_buffer[5])
 307 #define R_SIZECODE (reply_buffer[6])
 308 
 309 #define SEL_DLY (2*HZ/100)
 310 
 311 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 312 /*
 313  * this struct defines the different floppy drive types.
 314  */
 315 static struct {
 316         struct floppy_drive_params params;
 317         const char *name; /* name printed while booting */
 318 } default_drive_params[]= {
 319 /* NOTE: the time values in jiffies should be in msec!
 320  CMOS drive type
 321   |     Maximum data rate supported by drive type
 322   |     |   Head load time, msec
 323   |     |   |   Head unload time, msec (not used)
 324   |     |   |   |     Step rate interval, usec
 325   |     |   |   |     |       Time needed for spinup time (jiffies)
 326   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 327   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 328   |     |   |   |     |       |      |   |     Select delay
 329   |     |   |   |     |       |      |   |     |     RPS
 330   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 331   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 332   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 333   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 334 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 335       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 336 
 337 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 338       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 339 
 340 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 341       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 342 
 343 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 344       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 345 
 346 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 347       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 348 
 349 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 350       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 351 
 352 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 353       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 354 /*    |  --autodetected formats---    |      |      |
 355  *    read_track                      |      |    Name printed when booting
 356  *                                    |     Native format
 357  *                  Frequency of disk change checks */
 358 };
 359 
 360 static struct floppy_drive_params drive_params[N_DRIVE];
 361 static struct floppy_drive_struct drive_state[N_DRIVE];
 362 static struct floppy_write_errors write_errors[N_DRIVE];
 363 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 364 
 365 /*
 366  * This struct defines the different floppy types.
 367  *
 368  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 369  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 370  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 371  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 372  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 373  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 374  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 375  * 'stretch' should probably be renamed to something more general, like
 376  * 'options'.  Other parameters should be self-explanatory (see also
 377  * setfdprm(8)).
 378  */
 379 static struct floppy_struct floppy_type[32] = {
 380         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 381         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 382         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 383         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 384         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 385         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 386         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 387         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 388         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 389         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 390 
 391         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 392         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 393         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 394         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 395         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 396         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 397         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 398         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 399         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 400         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 401 
 402         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 403         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 404         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 405         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 406         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 407         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 408         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 409         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 410         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 411 
 412         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 413         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 414         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 415 };
 416 
 417 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 418 #define SECTSIZE (_FD_SECTSIZE(*floppy))
 419 
 420 /* Auto-detection: Disk type used until the next media change occurs. */
 421 static struct floppy_struct *current_type[N_DRIVE] = {
 422         NULL, NULL, NULL, NULL,
 423         NULL, NULL, NULL, NULL
 424 };
 425 
 426 /*
 427  * User-provided type information. current_type points to
 428  * the respective entry of this array.
 429  */
 430 static struct floppy_struct user_params[N_DRIVE];
 431 
 432 static int floppy_sizes[256];
 433 static int floppy_blocksizes[256] = { 0, };
 434 
 435 /*
 436  * The driver is trying to determine the correct media format
 437  * while probing is set. rw_interrupt() clears it after a
 438  * successful access.
 439  */
 440 static int probing = 0;
 441 
 442 /* Synchronization of FDC access. */
 443 #define FD_COMMAND_NONE -1
 444 #define FD_COMMAND_ERROR 2
 445 #define FD_COMMAND_OKAY 3
 446 
 447 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 448 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 449 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 450 #define CALL(x) if ((x) == -EINTR) return -EINTR
 451 #define ECALL(x) if ((ret = (x))) return ret;
 452 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 453 #define WAIT(x) _WAIT((x),interruptible)
 454 #define IWAIT(x) _WAIT((x),1)
 455 
 456 /* Errors during formatting are counted here. */
 457 static int format_errors;
 458 
 459 /* Format request descriptor. */
 460 static struct format_descr format_req;
 461 
 462 /*
 463  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 464  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 465  * H is head unload time (1=16ms, 2=32ms, etc)
 466  */
 467 
 468 /*
 469  * Track buffer
 470  * Because these are written to by the DMA controller, they must
 471  * not contain a 64k byte boundary crossing, or data will be
 472  * corrupted/lost.
 473  */
 474 static char *floppy_track_buffer=0;
 475 static int max_buffer_sectors=0;
 476 
 477 static int *errors;
 478 typedef void (*done_f)(int);
 479 static struct cont_t {
 480         void (*interrupt)(void); /* this is called after the interrupt of the
 481                                   * main command */
 482         void (*redo)(void); /* this is called to retry the operation */
 483         void (*error)(void); /* this is called to tally an error */
 484         done_f done; /* this is called to say if the operation has 
 485                       * succeeded/failed */
 486 } *cont=NULL;
 487 
 488 static void floppy_ready(void);
 489 static void floppy_start(void);
 490 static void process_fd_request(void);
 491 static void recalibrate_floppy(void);
 492 static void floppy_shutdown(unsigned long);
 493 
 494 static int floppy_grab_irq_and_dma(void);
 495 static void floppy_release_irq_and_dma(void);
 496 
 497 /*
 498  * The "reset" variable should be tested whenever an interrupt is scheduled,
 499  * after the commands have been sent. This is to ensure that the driver doesn't
 500  * get wedged when the interrupt doesn't come because of a failed command.
 501  * reset doesn't need to be tested before sending commands, because
 502  * output_byte is automatically disabled when reset is set.
 503  */
 504 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
 505 static void reset_fdc(void);
 506 
 507 /*
 508  * These are global variables, as that's the easiest way to give
 509  * information to interrupts. They are the data used for the current
 510  * request.
 511  */
 512 #define NO_TRACK -1
 513 #define NEED_1_RECAL -2
 514 #define NEED_2_RECAL -3
 515 
 516 /* */
 517 static int usage_count = 0;
 518 
 519 
 520 /* buffer related variables */
 521 static int buffer_track = -1;
 522 static int buffer_drive = -1;
 523 static int buffer_min = -1;
 524 static int buffer_max = -1;
 525 
 526 /* fdc related variables, should end up in a struct */
 527 static struct floppy_fdc_state fdc_state[N_FDC];
 528 static int fdc; /* current fdc */
 529 
 530 static struct floppy_struct *_floppy = floppy_type;
 531 static unsigned char current_drive = 0;
 532 static long current_count_sectors = 0;
 533 static unsigned char sector_t; /* sector in track */
 534 
 535 #ifdef DEBUGT
 536 static long unsigned debugtimer;
 537 #endif
 538 
 539 /*
 540  * Debugging
 541  * =========
 542  */
 543 static inline void set_debugt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 544 {
 545 #ifdef DEBUGT
 546         debugtimer = jiffies;
 547 #endif
 548 }
 549 
 550 static inline void debugt(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 551 {
 552 #ifdef DEBUGT
 553         if (DP->flags & DEBUGT)
 554                 printk("%s dtime=%lu\n", message, jiffies-debugtimer);
 555 #endif
 556 }
 557 
 558 typedef void (*timeout_fn)(unsigned long);
 559 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 560                                        (timeout_fn) floppy_shutdown };
 561 
 562 static const char *timeout_message;
 563 
 564 #ifdef FLOPPY_SANITY_CHECK
 565 static void is_alive(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 566 {
 567         /* this routine checks whether the floppy driver is "alive" */
 568         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 569                 DPRINT1("timeout handler died: %s\n",message);
 570         }
 571 }
 572 #endif
 573 
 574 #ifdef FLOPPY_SANITY_CHECK
 575 
 576 #define OLOGSIZE 20
 577 
 578 static void (*lasthandler)(void) = NULL;
 579 static int interruptjiffies=0;
 580 static int resultjiffies=0;
 581 static int resultsize=0;
 582 static int lastredo=0;
 583 
 584 static struct output_log {
 585         unsigned char data;
 586         unsigned char status;
 587         unsigned long jiffies;
 588 } output_log[OLOGSIZE];
 589 
 590 static int output_log_pos=0;
 591 #endif
 592 
 593 #define CURRENTD -1
 594 #define MAXTIMEOUT -2
 595 
 596 static void reschedule_timeout(int drive, const char *message, int marg)
     /* [previous][next][first][last][top][bottom][index][help] */
 597 {
 598         if (drive == CURRENTD)
 599                 drive = current_drive;
 600         del_timer(&fd_timeout);
 601         if (drive < 0 || drive > N_DRIVE) {
 602                 fd_timeout.expires = jiffies + 20*HZ;
 603                 drive=0;
 604         } else
 605                 fd_timeout.expires = jiffies + UDP->timeout;
 606         add_timer(&fd_timeout);
 607         if (UDP->flags & FD_DEBUG){
 608                 DPRINT("reschedule timeout ");
 609                 printk(message, marg);
 610                 printk("\n");
 611         }
 612         timeout_message = message;
 613 }
 614 
 615 static int maximum(int a, int b)
     /* [previous][next][first][last][top][bottom][index][help] */
 616 {
 617         if(a > b)
 618                 return a;
 619         else
 620                 return b;
 621 }
 622 #define INFBOUND(a,b) (a)=maximum((a),(b));
 623 
 624 static int minimum(int a, int b)
     /* [previous][next][first][last][top][bottom][index][help] */
 625 {
 626         if(a < b)
 627                 return a;
 628         else
 629                 return b;
 630 }
 631 #define SUPBOUND(a,b) (a)=minimum((a),(b));
 632 
 633 
 634 /*
 635  * Bottom half floppy driver.
 636  * ==========================
 637  *
 638  * This part of the file contains the code talking directly to the hardware,
 639  * and also the main service loop (seek-configure-spinup-command)
 640  */
 641 
 642 /*
 643  * disk change.
 644  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 645  * and the last_checked date.
 646  *
 647  * last_checked is the date of the last check which showed 'no disk change'
 648  * FD_DISK_CHANGE is set under two conditions:
 649  * 1. The floppy has been changed after some i/o to that floppy already
 650  *    took place.
 651  * 2. No floppy disk is in the drive. This is done in order to ensure that
 652  *    requests are quickly flushed in case there is no disk in the drive. It
 653  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 654  *    the drive.
 655  *
 656  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 657  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 658  *  each seek. If a disk is present, the disk change line should also be
 659  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 660  *  change line is set, this means either that no disk is in the drive, or
 661  *  that it has been removed since the last seek.
 662  *
 663  * This means that we really have a third possibility too:
 664  *  The floppy has been changed after the last seek.
 665  */
 666 
 667 static int disk_change(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 668 {
 669         int fdc=FDC(drive);
 670 #ifdef FLOPPY_SANITY_CHECK
 671         if (jiffies < UDP->select_delay + UDRS->select_date)
 672                 DPRINT("WARNING disk change called early\n");
 673         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 674            (FDCS->dor & 3) != UNIT(drive) ||
 675            fdc != FDC(drive)){
 676                 DPRINT("probing disk change on unselected drive\n");
 677                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 678                         FDCS->dor);
 679         }
 680 #endif
 681 
 682 #ifdef DCL_DEBUG
 683         if (UDP->flags & FD_DEBUG){
 684                 DPRINT1("checking disk change line for drive %d\n",drive);
 685                 DPRINT1("jiffies=%ld\n", jiffies);
 686                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 687                 DPRINT1("flags=%x\n",UDRS->flags);
 688         }
 689 #endif
 690         if (UDP->flags & FD_BROKEN_DCL)
 691                 return UTESTF(FD_DISK_CHANGED);
 692         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 693                 USETF(FD_VERIFY); /* verify write protection */
 694                 if (UDRS->maxblock){
 695                         /* mark it changed */
 696                         USETF(FD_DISK_CHANGED);
 697 
 698                         /* invalidate its geometry */
 699                         if (UDRS->keep_data >= 0) {
 700                                 if ((UDP->flags & FTD_MSG) &&
 701                                     current_type[drive] != NULL)
 702                                         DPRINT("Disk type is undefined after "
 703                                                "disk change\n");
 704                                 current_type[drive] = NULL;
 705                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 706                         }
 707                 }
 708                 /*USETF(FD_DISK_NEWCHANGE);*/
 709                 return 1;
 710         } else {
 711                 UDRS->last_checked=jiffies;
 712                 UCLEARF(FD_DISK_NEWCHANGE);
 713         }
 714         return 0;
 715 }
 716 
 717 static inline int is_selected(int dor, int unit)
     /* [previous][next][first][last][top][bottom][index][help] */
 718 {
 719         return ((dor  & (0x10 << unit)) && (dor &3) == unit);
 720 }
 721 
 722 static int set_dor(int fdc, char mask, char data)
     /* [previous][next][first][last][top][bottom][index][help] */
 723 {
 724         register unsigned char drive, unit, newdor,olddor;
 725 
 726         if (FDCS->address == -1)
 727                 return -1;
 728 
 729         olddor = FDCS->dor;
 730         newdor =  (olddor & mask) | data;
 731         if (newdor != olddor){
 732                 unit = olddor & 0x3;
 733                 if (is_selected(olddor, unit) && !is_selected(newdor,unit)){
 734                         drive = REVDRIVE(fdc,unit);
 735 #ifdef DCL_DEBUG
 736                         if (UDP->flags & FD_DEBUG){
 737                                 DPRINT("calling disk change from set_dor\n");
 738                         }
 739 #endif
 740                         disk_change(drive);
 741                 }
 742                 FDCS->dor = newdor;
 743                 fd_outb(newdor, FD_DOR);
 744 
 745                 unit = newdor & 0x3;
 746                 if (!is_selected(olddor, unit) && is_selected(newdor,unit)){
 747                         drive = REVDRIVE(fdc,unit);
 748                         UDRS->select_date = jiffies;
 749                 }
 750         }
 751         if (newdor & FLOPPY_MOTOR_MASK)
 752                 floppy_grab_irq_and_dma();
 753         if (olddor & FLOPPY_MOTOR_MASK)
 754                 floppy_release_irq_and_dma();
 755         return olddor;
 756 }
 757 
 758 static void twaddle(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 759 {
 760         if (DP->select_delay)
 761                 return;
 762         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 763         fd_outb(FDCS->dor, FD_DOR);
 764         DRS->select_date = jiffies;
 765 }
 766 
 767 /* reset all driver information about the current fdc. This is needed after
 768  * a reset, and after a raw command. */
 769 static void reset_fdc_info(int mode)
     /* [previous][next][first][last][top][bottom][index][help] */
 770 {
 771         int drive;
 772 
 773         FDCS->spec1 = FDCS->spec2 = -1;
 774         FDCS->need_configure = 1;
 775         FDCS->perp_mode = 1;
 776         FDCS->rawcmd = 0;
 777         for (drive = 0; drive < N_DRIVE; drive++)
 778                 if (FDC(drive) == fdc &&
 779                     (mode || UDRS->track != NEED_1_RECAL))
 780                         UDRS->track = NEED_2_RECAL;
 781 }
 782 
 783 /* selects the fdc and drive, and enables the fdc's input/dma. */
 784 static void set_fdc(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 785 {
 786         if (drive >= 0 && drive < N_DRIVE){
 787                 fdc = FDC(drive);
 788                 current_drive = drive;
 789         }
 790         if (fdc != 1 && fdc != 0) {
 791                 printk("bad fdc value\n");
 792                 return;
 793         }
 794         set_dor(fdc,~0,8);
 795 #if N_FDC > 1
 796         set_dor(1-fdc, ~8, 0);
 797 #endif
 798         if (FDCS->rawcmd == 2)
 799                 reset_fdc_info(1);
 800         if (fd_inb(FD_STATUS) != STATUS_READY)
 801                 FDCS->reset = 1;
 802 }
 803 
 804 /* locks the driver */
 805 static int lock_fdc(int drive, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
 806 {
 807         if (!usage_count){
 808                 printk("trying to lock fdc while usage count=0\n");
 809                 return -1;
 810         }
 811         floppy_grab_irq_and_dma();
 812         cli();
 813         while (fdc_busy && NO_SIGNAL)
 814                 interruptible_sleep_on(&fdc_wait);
 815         if (fdc_busy){
 816                 sti();
 817                 return -EINTR;
 818         }
 819         fdc_busy = 1;
 820         sti();
 821         command_status = FD_COMMAND_NONE;
 822         reschedule_timeout(drive, "lock fdc", 0);
 823         set_fdc(drive);
 824         return 0;
 825 }
 826 
 827 #define LOCK_FDC(drive,interruptible) \
 828 if (lock_fdc(drive,interruptible)) return -EINTR;
 829 
 830 
 831 /* unlocks the driver */
 832 static inline void unlock_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 833 {
 834         raw_cmd = 0;
 835         if (!fdc_busy)
 836                 DPRINT("FDC access conflict!\n");
 837 
 838         if (DEVICE_INTR)
 839                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 840                         DEVICE_INTR);
 841         command_status = FD_COMMAND_NONE;
 842         del_timer(&fd_timeout);
 843         cont = NULL;
 844         fdc_busy = 0;
 845         floppy_release_irq_and_dma();
 846         wake_up(&fdc_wait);
 847 }
 848 
 849 /* switches the motor off after a given timeout */
 850 static void motor_off_callback(unsigned long nr)
     /* [previous][next][first][last][top][bottom][index][help] */
 851 {
 852         unsigned char mask = ~(0x10 << UNIT(nr));
 853 
 854         set_dor(FDC(nr), mask, 0);
 855 }
 856 
 857 static struct timer_list motor_off_timer[N_DRIVE] = {
 858         { NULL, NULL, 0, 0, motor_off_callback },
 859         { NULL, NULL, 0, 1, motor_off_callback },
 860         { NULL, NULL, 0, 2, motor_off_callback },
 861         { NULL, NULL, 0, 3, motor_off_callback },
 862         { NULL, NULL, 0, 4, motor_off_callback },
 863         { NULL, NULL, 0, 5, motor_off_callback },
 864         { NULL, NULL, 0, 6, motor_off_callback },
 865         { NULL, NULL, 0, 7, motor_off_callback }
 866 };
 867 
 868 /* schedules motor off */
 869 static void floppy_off(unsigned int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 870 {
 871         unsigned long volatile delta;
 872         register int fdc=FDC(drive);
 873 
 874         if (!(FDCS->dor & (0x10 << UNIT(drive))))
 875                 return;
 876 
 877         del_timer(motor_off_timer+drive);
 878 
 879         /* make spindle stop in a position which minimizes spinup time
 880          * next time */
 881         if (UDP->rps){
 882                 delta = jiffies - UDRS->first_read_date + HZ -
 883                         UDP->spindown_offset;
 884                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
 885                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 886         }
 887         add_timer(motor_off_timer+drive);
 888 }
 889 
 890 /*
 891  * cycle through all N_DRIVE floppy drives, for disk change testing.
 892  * stopping at current drive. This is done before any long operation, to
 893  * be sure to have up to date disk change information.
 894  */
 895 static void scandrives(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 896 {
 897         int i, drive, saved_drive;
 898 
 899         if (DP->select_delay)
 900                 return;
 901 
 902         saved_drive = current_drive;
 903         for (i=0; i < N_DRIVE; i++){
 904                 drive = (saved_drive + i + 1) % N_DRIVE;
 905                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
 906                         continue; /* skip closed drives */
 907                 set_fdc(drive);
 908                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
 909                       (0x10 << UNIT(drive))))
 910                         /* switch the motor off again, if it was off to
 911                          * begin with */
 912                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
 913         }
 914         set_fdc(saved_drive);
 915 }
 916 
 917 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 918 
 919 /* this function makes sure that the disk stays in the drive during the
 920  * transfer */
 921 static void fd_watchdog(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 922 {
 923 #ifdef DCL_DEBUG
 924         if (DP->flags & FD_DEBUG){
 925                 DPRINT("calling disk change from watchdog\n");
 926         }
 927 #endif
 928 
 929         if (disk_change(current_drive)){
 930                 DPRINT("disk removed during i/o\n");
 931                 floppy_shutdown(1);
 932         } else {
 933                 del_timer(&fd_timer);
 934                 fd_timer.function = (timeout_fn) fd_watchdog;
 935                 fd_timer.expires = jiffies + HZ / 10;
 936                 add_timer(&fd_timer);
 937         }
 938 }
 939 
 940 static void main_command_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 941 {
 942         del_timer(&fd_timer);
 943         cont->interrupt();
 944 }
 945 
 946 /* waits for a delay (spinup or select) to pass */
 947 static int wait_for_completion(int delay, timeout_fn function)
     /* [previous][next][first][last][top][bottom][index][help] */
 948 {
 949         if (FDCS->reset){
 950                 reset_fdc(); /* do the reset during sleep to win time
 951                               * if we don't need to sleep, it's a good
 952                               * occasion anyways */
 953                 return 1;
 954         }
 955 
 956         if (jiffies < delay){
 957                 del_timer(&fd_timer);
 958                 fd_timer.function = function;
 959                 fd_timer.expires = delay;
 960                 add_timer(&fd_timer);
 961                 return 1;
 962         }
 963         return 0;
 964 }
 965 
 966 static int hlt_disabled=0;
 967 static void floppy_disable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 968 {
 969         unsigned long flags;
 970         save_flags(flags);
 971         cli();
 972         if (!hlt_disabled){
 973                 hlt_disabled=1;
 974 #ifdef HAVE_DISABLE_HLT
 975                 disable_hlt();
 976 #endif
 977         }
 978         restore_flags(flags);
 979 }
 980 
 981 static void floppy_enable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 982 {
 983         unsigned long flags;
 984         save_flags(flags);
 985         cli();
 986         if (hlt_disabled){
 987                 hlt_disabled=0;
 988 #ifdef HAVE_DISABLE_HLT
 989                 enable_hlt();
 990 #endif
 991         }
 992         restore_flags(flags);
 993 }
 994 
 995 
 996 static void setup_DMA(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 997 {
 998 #ifdef FLOPPY_SANITY_CHECK
 999         if (raw_cmd->length == 0){
1000                 int i;
1001 
1002                 printk("zero dma transfer size:");
1003                 for (i=0; i < raw_cmd->cmd_count; i++)
1004                         printk("%x,", raw_cmd->cmd[i]);
1005                 printk("\n");
1006                 cont->done(0);
1007                 FDCS->reset = 1;
1008                 return;
1009         }
1010         if ((long) raw_cmd->kernel_data % 512){
1011                 printk("non aligned address: %p\n", raw_cmd->kernel_data);
1012                 cont->done(0);
1013                 FDCS->reset=1;
1014                 return;
1015         }
1016         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
1017                 printk("DMA crossing 64-K boundary %p-%p\n",
1018                        raw_cmd->kernel_data,
1019                        raw_cmd->kernel_data + raw_cmd->length);
1020                 cont->done(0);
1021                 FDCS->reset=1;
1022                 return;
1023         }
1024 #endif
1025         cli();
1026         fd_disable_dma();
1027         fd_clear_dma_ff();
1028         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1029                         DMA_MODE_READ : DMA_MODE_WRITE);
1030         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1031         fd_set_dma_count(raw_cmd->length);
1032         virtual_dma_port = FDCS->address;
1033         fd_enable_dma();
1034         sti();
1035         floppy_disable_hlt();
1036 }
1037 
1038 void show_floppy(void);
1039 
1040 /* waits until the fdc becomes ready */
1041 static int wait_til_ready(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1042 {
1043         int counter, status;
1044         if(FDCS->reset)
1045                 return -1;
1046         for (counter = 0; counter < 10000; counter++) {
1047                 status = fd_inb(FD_STATUS);             
1048                 if (status & STATUS_READY)
1049                         return status;
1050         }
1051         if (!initialising) {
1052                 DPRINT2("Getstatus times out (%x) on fdc %d\n",
1053                         status, fdc);
1054                 show_floppy();
1055         }
1056         FDCS->reset = 1;
1057         return -1;
1058 }
1059 
1060 /* sends a command byte to the fdc */
1061 static int output_byte(char byte)
     /* [previous][next][first][last][top][bottom][index][help] */
1062 {
1063         int status;
1064 
1065         if ((status = wait_til_ready()) < 0)
1066                 return -1;
1067         if ((status & (STATUS_READY|STATUS_DIR|STATUS_DMA)) == STATUS_READY){
1068                 fd_outb(byte,FD_DATA);
1069 #ifdef FLOPPY_SANITY_CHECK
1070                 output_log[output_log_pos].data = byte;
1071                 output_log[output_log_pos].status = status;
1072                 output_log[output_log_pos].jiffies = jiffies;
1073                 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1074 #endif
1075                 return 0;
1076         }
1077         FDCS->reset = 1;
1078         if (!initialising) {
1079                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1080                         byte, status);
1081                 show_floppy();
1082         }
1083         return -1;
1084 }
1085 #define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;}
1086 
1087 /* gets the response from the fdc */
1088 static int result(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1089 {
1090         int i, status;
1091 
1092         for(i=0; i < MAX_REPLIES; i++) {
1093                 if ((status = wait_til_ready()) < 0)
1094                         break;
1095                 status &= STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA;
1096                 if ((status & ~STATUS_BUSY) == STATUS_READY){
1097 #ifdef FLOPPY_SANITY_CHECK
1098                         resultjiffies = jiffies;
1099                         resultsize = i;
1100 #endif
1101                         return i;
1102                 }
1103                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY))
1104                         reply_buffer[i] = fd_inb(FD_DATA);
1105                 else
1106                         break;
1107         }
1108         if(!initialising) {
1109                 DPRINT2("'get result' error. Last status=%x Read bytes=%d\n",
1110                         status, i);
1111                 show_floppy();
1112         }
1113         FDCS->reset = 1;
1114         return -1;
1115 }
1116 
1117 #define MORE_OUTPUT -2
1118 /* does the fdc need more output? */
1119 static int need_more_output(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1120 {
1121         int status;
1122         if( (status = wait_til_ready()) < 0)
1123                 return -1;
1124         if ((status & (STATUS_READY|STATUS_DIR|STATUS_DMA)) == STATUS_READY)
1125                 return MORE_OUTPUT;
1126         return result();
1127 }
1128 
1129 /* Set perpendicular mode as required, based on data rate, if supported.
1130  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1131  */
1132 static inline void perpendicular_mode(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1133 {
1134         unsigned char perp_mode;
1135 
1136         if (raw_cmd->rate & 0x40){
1137                 switch(raw_cmd->rate & 3){
1138                         case 0:
1139                                 perp_mode=2;
1140                                 break;
1141                         case 3:
1142                                 perp_mode=3;
1143                                 break;
1144                         default:
1145                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1146                                 cont->done(0);
1147                                 FDCS->reset = 1; /* convenient way to return to
1148                                                   * redo without to much hassle (deep
1149                                                   * stack et al. */
1150                                 return;
1151                 }
1152         } else
1153                 perp_mode = 0;
1154 
1155         if (FDCS->perp_mode == perp_mode)
1156                 return;
1157         if (FDCS->version >= FDC_82077_ORIG) {
1158                 output_byte(FD_PERPENDICULAR);
1159                 output_byte(perp_mode);
1160                 FDCS->perp_mode = perp_mode;
1161         } else if (perp_mode) {
1162                 DPRINT("perpendicular mode not supported by this FDC.\n");
1163         }
1164 } /* perpendicular_mode */
1165 
1166 static int fifo = 0xa;
1167 
1168 static int fdc_configure(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1169 {
1170         /* Turn on FIFO */
1171         output_byte(FD_CONFIGURE);
1172 #ifdef __sparc__ 
1173         output_byte(0x64);      /* Motor off timeout */
1174         output_byte(fdc_cfg | 0x0A);
1175 #else
1176         if(need_more_output() != MORE_OUTPUT)
1177                 return 0;
1178         output_byte(0);
1179         output_byte(0x10 | (fifo & 0xf)); /* FIFO on, polling off,
1180                                              10 byte threshold */
1181 #endif
1182         output_byte(0); /* precompensation from track 
1183                            0 upwards */
1184         return 1;
1185 }       
1186 
1187 #define NOMINAL_DTR 500
1188 
1189 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1190  * head load time, and DMA disable flag to values needed by floppy.
1191  *
1192  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1193  * to account for the data rate-based scaling done by the 82072 and 82077
1194  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1195  * 8272a).
1196  *
1197  * Note that changing the data transfer rate has a (probably deleterious)
1198  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1199  * fdc_specify is called again after each data transfer rate
1200  * change.
1201  *
1202  * srt: 1000 to 16000 in microseconds
1203  * hut: 16 to 240 milliseconds
1204  * hlt: 2 to 254 milliseconds
1205  *
1206  * These values are rounded up to the next highest available delay time.
1207  */
1208 static void fdc_specify(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1209 {
1210         unsigned char spec1, spec2;
1211         int srt, hlt, hut;
1212         unsigned long dtr = NOMINAL_DTR;
1213         unsigned long scale_dtr = NOMINAL_DTR;
1214         int hlt_max_code = 0x7f;
1215         int hut_max_code = 0xf;
1216 
1217         if (FDCS->need_configure && FDCS->has_fifo) {
1218                 fdc_configure();
1219                 FDCS->need_configure = 0;
1220                 /*DPRINT("FIFO enabled\n");*/
1221         }
1222 
1223 #ifdef __sparc__
1224         /* If doing implied seeks, no specify necessary */
1225         if(fdc_cfg&0x40)
1226                 return;
1227 #endif
1228 
1229         switch (raw_cmd->rate & 0x03) {
1230                 case 3:
1231                         dtr = 1000;
1232                         break;
1233                 case 1:
1234                         dtr = 300;
1235                         break;
1236                 case 2:
1237                         dtr = 250;
1238                         break;
1239         }
1240 
1241         if (FDCS->version >= FDC_82072) {
1242                 scale_dtr = dtr;
1243                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1244                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1245         }
1246 
1247         /* Convert step rate from microseconds to milliseconds and 4 bits */
1248         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1249         SUPBOUND(srt, 0xf);
1250         INFBOUND(srt, 0);
1251 
1252         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1253         if (hlt < 0x01)
1254                 hlt = 0x01;
1255         else if (hlt > 0x7f)
1256                 hlt = hlt_max_code;
1257 
1258         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1259         if (hut < 0x1)
1260                 hut = 0x1;
1261         else if (hut > 0xf)
1262                 hut = hut_max_code;
1263 
1264         spec1 = (srt << 4) | hut;
1265         spec2 = (hlt << 1) | (use_virtual_dma & 1);
1266 
1267         /* If these parameters did not change, just return with success */
1268         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1269                 /* Go ahead and set spec1 and spec2 */
1270                 output_byte(FD_SPECIFY);
1271                 output_byte(FDCS->spec1 = spec1);
1272                 output_byte(FDCS->spec2 = spec2);
1273         }
1274 } /* fdc_specify */
1275 
1276 /* Set the FDC's data transfer rate on behalf of the specified drive.
1277  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1278  * of the specify command (i.e. using the fdc_specify function).
1279  */
1280 static int fdc_dtr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1281 {
1282         /* If data rate not already set to desired value, set it. */
1283         if ((raw_cmd->rate & 3) == FDCS->dtr)
1284                 return 0;
1285 
1286         /* Set dtr */
1287         fd_outb(raw_cmd->rate & 3, FD_DCR);
1288 
1289         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1290          * need a stabilization period of several milliseconds to be
1291          * enforced after data rate changes before R/W operations.
1292          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1293          */
1294         FDCS->dtr = raw_cmd->rate & 3;
1295         return(wait_for_completion(jiffies+2*HZ/100,
1296                                    (timeout_fn) floppy_ready));
1297 } /* fdc_dtr */
1298 
1299 static void tell_sector(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1300 {
1301         printk(": track %d, head %d, sector %d, size %d",
1302                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1303 } /* tell_sector */
1304 
1305 
1306 /*
1307  * Ok, this error interpreting routine is called after a
1308  * DMA read/write has succeeded
1309  * or failed, so we check the results, and copy any buffers.
1310  * hhb: Added better error reporting.
1311  * ak: Made this into a separate routine.
1312  */
1313 static int interpret_errors(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1314 {
1315         char bad;
1316 
1317         if (inr!=7) {
1318                 DPRINT("-- FDC reply error");
1319                 FDCS->reset = 1;
1320                 return 1;
1321         }
1322 
1323         /* check IC to find cause of interrupt */
1324         switch (ST0 & ST0_INTR) {
1325                 case 0x40:      /* error occurred during command execution */
1326                         if (ST1 & ST1_EOC)
1327                                 return 0; /* occurs with pseudo-DMA */
1328                         bad = 1;
1329                         if (ST1 & ST1_WP) {
1330                                 DPRINT("Drive is write protected\n");
1331                                 CLEARF(FD_DISK_WRITABLE);
1332                                 cont->done(0);
1333                                 bad = 2;
1334                         } else if (ST1 & ST1_ND) {
1335                                 SETF(FD_NEED_TWADDLE);
1336                         } else if (ST1 & ST1_OR) {
1337                                 if (DP->flags & FTD_MSG)
1338                                         DPRINT("Over/Underrun - retrying\n");
1339                                 bad = 0;
1340                         }else if (*errors >= DP->max_errors.reporting){
1341                                 DPRINT("");
1342                                 if (ST0 & ST0_ECE) {
1343                                         printk("Recalibrate failed!");
1344                                 } else if (ST2 & ST2_CRC) {
1345                                         printk("data CRC error");
1346                                         tell_sector();
1347                                 } else if (ST1 & ST1_CRC) {
1348                                         printk("CRC error");
1349                                         tell_sector();
1350                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1351                                         if (!probing) {
1352                                                 printk("sector not found");
1353                                                 tell_sector();
1354                                         } else
1355                                                 printk("probe failed...");
1356                                 } else if (ST2 & ST2_WC) {      /* seek error */
1357                                         printk("wrong cylinder");
1358                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1359                                         printk("bad cylinder");
1360                                 } else {
1361                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1362                                         tell_sector();
1363                                 }
1364                                 printk("\n");
1365 
1366                         }
1367                         if (ST2 & ST2_WC || ST2 & ST2_BC)
1368                                 /* wrong cylinder => recal */
1369                                 DRS->track = NEED_2_RECAL;
1370                         return bad;
1371                 case 0x80: /* invalid command given */
1372                         DPRINT("Invalid FDC command given!\n");
1373                         cont->done(0);
1374                         return 2;
1375                 case 0xc0:
1376                         DPRINT("Abnormal termination caused by polling\n");
1377                         cont->error();
1378                         return 2;
1379                 default: /* (0) Normal command termination */
1380                         return 0;
1381         }
1382 }
1383 
1384 /*
1385  * This routine is called when everything should be correctly set up
1386  * for the transfer (ie floppy motor is on, the correct floppy is
1387  * selected, and the head is sitting on the right track).
1388  */
1389 static void setup_rw_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1390 {
1391         int i,ready_date,r, flags,dflags;
1392         timeout_fn function;
1393 
1394         flags = raw_cmd->flags;
1395         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1396                 flags |= FD_RAW_INTR;
1397 
1398         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1399                 ready_date = DRS->spinup_date + DP->spinup;
1400                 /* If spinup will take a long time, rerun scandrives
1401                  * again just before spinup completion. Beware that
1402                  * after scandrives, we must again wait for selection.
1403                  */
1404                 if (ready_date > jiffies + DP->select_delay){
1405                         ready_date -= DP->select_delay;
1406                         function = (timeout_fn) floppy_start;
1407                 } else
1408                         function = (timeout_fn) setup_rw_floppy;
1409 
1410                 /* wait until the floppy is spinning fast enough */
1411                 if (wait_for_completion(ready_date,function))
1412                         return;
1413         }
1414         dflags = DRS->flags;
1415 
1416         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1417                 setup_DMA();
1418 
1419         if (flags & FD_RAW_INTR)
1420                 SET_INTR(main_command_interrupt);
1421 
1422         r=0;
1423         for (i=0; i< raw_cmd->cmd_count; i++)
1424                 r|=output_byte(raw_cmd->cmd[i]);
1425 
1426 #ifdef DEBUGT
1427         debugt("rw_command: ");
1428 #endif
1429         if (r){
1430                 cont->error();
1431                 reset_fdc();
1432                 return;
1433         }
1434 
1435         if (!(flags & FD_RAW_INTR)){
1436                 inr = result();
1437                 cont->interrupt();
1438         } else if (flags & FD_RAW_NEED_DISK)
1439                 fd_watchdog();
1440 }
1441 
1442 static int blind_seek;
1443 
1444 /*
1445  * This is the routine called after every seek (or recalibrate) interrupt
1446  * from the floppy controller.
1447  */
1448 static void seek_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1449 {
1450 #ifdef DEBUGT
1451         debugt("seek interrupt:");
1452 #endif
1453         if (inr != 2 || (ST0 & 0xF8) != 0x20) {
1454                 DPRINT("seek failed\n");
1455                 DRS->track = NEED_2_RECAL;
1456                 cont->error();
1457                 cont->redo();
1458                 return;
1459         }
1460         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1461 #ifdef DCL_DEBUG
1462                 if (DP->flags & FD_DEBUG){
1463                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1464                         DPRINT1("jiffies=%ld\n", jiffies);
1465                 }
1466 #endif
1467                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1468                 DRS->select_date = jiffies;
1469         }
1470         DRS->track = ST1;
1471         floppy_ready();
1472 }
1473 
1474 static void check_wp(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1475 {
1476         if (TESTF(FD_VERIFY)) {
1477                 /* check write protection */
1478                 output_byte(FD_GETSTATUS);
1479                 output_byte(UNIT(current_drive));
1480                 if (result() != 1){
1481                         FDCS->reset = 1;
1482                         return;
1483                 }
1484                 CLEARF(FD_VERIFY);
1485                 CLEARF(FD_NEED_TWADDLE);
1486 #ifdef DCL_DEBUG
1487                 if (DP->flags & FD_DEBUG){
1488                         DPRINT("checking whether disk is write protected\n");
1489                         DPRINT1("wp=%x\n",ST3 & 0x40);
1490                 }
1491 #endif
1492                 if (!(ST3  & 0x40))
1493                         SETF(FD_DISK_WRITABLE);
1494                 else
1495                         CLEARF(FD_DISK_WRITABLE);
1496         }
1497 }
1498 
1499 static void seek_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1500 {
1501         int track;
1502 
1503         blind_seek=0;
1504 
1505 #ifdef DCL_DEBUG
1506         if (DP->flags & FD_DEBUG){
1507                 DPRINT("calling disk change from seek\n");
1508         }
1509 #endif
1510 
1511         if (!TESTF(FD_DISK_NEWCHANGE) &&
1512             disk_change(current_drive) &&
1513             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1514                 /* the media changed flag should be cleared after the seek.
1515                  * If it isn't, this means that there is really no disk in
1516                  * the drive.
1517                  */
1518                 SETF(FD_DISK_CHANGED);
1519                 cont->done(0);
1520                 cont->redo();
1521                 return;
1522         }
1523         if (DRS->track <= NEED_1_RECAL){
1524                 recalibrate_floppy();
1525                 return;
1526         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1527                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1528                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1529                 /* we seek to clear the media-changed condition. Does anybody
1530                  * know a more elegant way, which works on all drives? */
1531                 if (raw_cmd->track)
1532                         track = raw_cmd->track - 1;
1533                 else {
1534                         if (DP->flags & FD_SILENT_DCL_CLEAR){
1535                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1536                                 blind_seek = 1;
1537                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1538                         }
1539                         track = 1;
1540                 }
1541         } else {
1542                 check_wp();
1543                 if (raw_cmd->track != DRS->track &&
1544                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1545                         track = raw_cmd->track;
1546                 else {
1547                         setup_rw_floppy();
1548                         return;
1549                 }
1550         }
1551 
1552 #ifdef __sparc__
1553         if (fdc_cfg&0x40) {
1554                 /* Implied seeks being done... */
1555                 DRS->track = raw_cmd->track;
1556                 setup_rw_floppy();
1557                 return;
1558         }
1559 #endif
1560 
1561         SET_INTR(seek_interrupt);
1562         output_byte(FD_SEEK);
1563         output_byte(UNIT(current_drive));
1564         LAST_OUT(track);
1565 #ifdef DEBUGT
1566         debugt("seek command:");
1567 #endif
1568 }
1569 
1570 static void recal_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1571 {
1572 #ifdef DEBUGT
1573         debugt("recal interrupt:");
1574 #endif
1575         if (inr !=2)
1576                 FDCS->reset = 1;
1577         else if (ST0 & ST0_ECE) {
1578                 switch(DRS->track){
1579                         case NEED_1_RECAL:
1580 #ifdef DEBUGT
1581                                 debugt("recal interrupt need 1 recal:");
1582 #endif
1583                                 /* after a second recalibrate, we still haven't
1584                                  * reached track 0. Probably no drive. Raise an
1585                                  * error, as failing immediately might upset
1586                                  * computers possessed by the Devil :-) */
1587                                 cont->error();
1588                                 cont->redo();
1589                                 return;
1590                         case NEED_2_RECAL:
1591 #ifdef DEBUGT
1592                                 debugt("recal interrupt need 2 recal:");
1593 #endif
1594                                 /* If we already did a recalibrate,
1595                                  * and we are not at track 0, this
1596                                  * means we have moved. (The only way
1597                                  * not to move at recalibration is to
1598                                  * be already at track 0.) Clear the
1599                                  * new change flag */
1600 #ifdef DCL_DEBUG
1601                                 if (DP->flags & FD_DEBUG){
1602                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1603                                 }
1604 #endif
1605 
1606                                 CLEARF(FD_DISK_NEWCHANGE);
1607                                 DRS->select_date = jiffies;
1608                                 /* fall through */
1609                         default:
1610 #ifdef DEBUGT
1611                                 debugt("recal interrupt default:");
1612 #endif
1613                                 /* Recalibrate moves the head by at
1614                                  * most 80 steps. If after one
1615                                  * recalibrate we don't have reached
1616                                  * track 0, this might mean that we
1617                                  * started beyond track 80.  Try
1618                                  * again.  */
1619                                 DRS->track = NEED_1_RECAL;
1620                                 break;
1621                 }
1622         } else
1623                 DRS->track = ST1;
1624         floppy_ready();
1625 }
1626 
1627 /*
1628  * Unexpected interrupt - Print as much debugging info as we can...
1629  * All bets are off...
1630  */
1631 static void unexpected_floppy_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1632 {
1633         int i;
1634         if (initialising)
1635                 return;
1636         if (print_unex){
1637                 DPRINT("unexpected interrupt\n");
1638                 if (inr >= 0)
1639                         for (i=0; i<inr; i++)
1640                                 printk("%d %x\n", i, reply_buffer[i]);
1641         }
1642         while(1){
1643                 output_byte(FD_SENSEI);
1644                 inr=result();
1645                 if (inr != 2)
1646                         break;
1647                 if (print_unex){
1648                         printk("sensei\n");
1649                         for (i=0; i<inr; i++)
1650                                 printk("%d %x\n", i, reply_buffer[i]);
1651                 }
1652         }
1653         FDCS->reset = 1;
1654 }
1655 
1656 static struct tq_struct floppy_tq =
1657 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1658 
1659 /* interrupt handler */
1660 static void floppy_interrupt(int irq, void *dev_id, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
1661 {
1662         void (*handler)(void) = DEVICE_INTR;
1663 
1664         lasthandler = handler;
1665         interruptjiffies = jiffies;
1666 
1667         fd_disable_dma();
1668         floppy_enable_hlt();
1669         CLEAR_INTR;
1670         if (fdc >= N_FDC || FDCS->address == -1){
1671                 /* we don't even know which FDC is the culprit */
1672                 printk("DOR0=%x\n", fdc_state[0].dor);
1673                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1674                 printk("handler=%p\n", handler);
1675                 is_alive("bizarre fdc");
1676                 return;
1677         }
1678         inr = result();
1679         if (!handler){
1680                 unexpected_floppy_interrupt();
1681                 is_alive("unexpected");
1682                 return;
1683         }
1684         if (inr == 0){
1685                 do {
1686                         output_byte(FD_SENSEI);
1687                         inr = result();
1688                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1689         }
1690         floppy_tq.routine = (void *)(void *) handler;
1691         queue_task_irq(&floppy_tq, &tq_timer);
1692         is_alive("normal interrupt end");
1693 }
1694 
1695 static void recalibrate_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1696 {
1697 #ifdef DEBUGT
1698         debugt("recalibrate floppy:");
1699 #endif
1700         SET_INTR(recal_interrupt);
1701         output_byte(FD_RECALIBRATE);
1702         LAST_OUT(UNIT(current_drive));
1703 }
1704 
1705 /*
1706  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1707  */
1708 static void reset_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1709 {
1710 #ifdef DEBUGT
1711         debugt("reset interrupt:");
1712 #endif
1713         result();               /* get the status ready for set_fdc */
1714         if (FDCS->reset) {
1715                 printk("reset set in interrupt, calling %p\n", cont->error);
1716                 cont->error(); /* a reset just after a reset. BAD! */
1717         }
1718         cont->redo();
1719 }
1720 
1721 /*
1722  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1723  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1724  */
1725 static void reset_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1726 {
1727         SET_INTR(reset_interrupt);
1728         FDCS->reset = 0;
1729         reset_fdc_info(0);
1730 
1731         /* Pseudo-DMA may intercept 'reset finished' interrupt.  */
1732         /* Irrelevant for systems with true DMA (i386).          */
1733         fd_disable_dma();
1734 
1735         if (FDCS->version >= FDC_82072A)
1736                 fd_outb(0x80 | (FDCS->dtr &3), FD_STATUS);
1737         else {
1738                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1739                 udelay(FD_RESET_DELAY);
1740                 fd_outb(FDCS->dor, FD_DOR);
1741         }
1742 }
1743 
1744 static void empty(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1745 {
1746 }
1747 
1748 void show_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1749 {
1750         int i;
1751 
1752         printk("\n");
1753         printk("floppy driver state\n");
1754         printk("-------------------\n");
1755         printk("now=%ld last interrupt=%d last called handler=%p\n",
1756                jiffies, interruptjiffies, lasthandler);
1757 
1758 
1759 #ifdef FLOPPY_SANITY_CHECK
1760         printk("timeout_message=%s\n", timeout_message);
1761         printk("last output bytes:\n");
1762         for (i=0; i < OLOGSIZE; i++)
1763                 printk("%2x %2x %ld\n",
1764                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1765                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1766                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1767         printk("last result at %d\n", resultjiffies);
1768         printk("last redo_fd_request at %d\n", lastredo);
1769         for (i=0; i<resultsize; i++){
1770                 printk("%2x ", reply_buffer[i]);
1771         }
1772         printk("\n");
1773 #endif
1774 
1775         printk("status=%x\n", fd_inb(FD_STATUS));
1776         printk("fdc_busy=%d\n", fdc_busy);
1777         if (DEVICE_INTR)
1778                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1779         if (floppy_tq.sync)
1780                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1781         if (fd_timer.prev)
1782                 printk("fd_timer.function=%p\n", fd_timer.function);
1783         if (fd_timeout.prev){
1784                 printk("timer_table=%p\n",fd_timeout.function);
1785                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1786                 printk("now=%ld\n",jiffies);
1787         }
1788         printk("cont=%p\n", cont);
1789         printk("CURRENT=%p\n", CURRENT);
1790         printk("command_status=%d\n", command_status);
1791         printk("\n");
1792 }
1793 
1794 static void floppy_shutdown(unsigned long mode)
     /* [previous][next][first][last][top][bottom][index][help] */
1795 {
1796         if (!initialising && !mode)
1797                 show_floppy();
1798         CLEAR_INTR;
1799         floppy_tq.routine = (void *)(void *) empty;
1800         del_timer(&fd_timer);
1801         sti();
1802 
1803         floppy_enable_hlt();
1804         fd_disable_dma();
1805         /* avoid dma going to a random drive after shutdown */
1806 
1807         if (!initialising && !mode)
1808                 DPRINT("floppy timeout\n");
1809         FDCS->reset = 1;
1810         if (cont){
1811                 cont->done(0);
1812                 cont->redo(); /* this will recall reset when needed */
1813         } else {
1814                 printk("no cont in shutdown!\n");
1815                 process_fd_request();
1816         }
1817         is_alive("floppy shutdown");
1818 }
1819 /*typedef void (*timeout_fn)(unsigned long);*/
1820 
1821 /* start motor, check media-changed condition and write protection */
1822 static int start_motor(void (*function)(void) )
     /* [previous][next][first][last][top][bottom][index][help] */
1823 {
1824         int mask, data;
1825 
1826         mask = 0xfc;
1827         data = UNIT(current_drive);
1828         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1829                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))){
1830                         set_debugt();
1831                         /* no read since this drive is running */
1832                         DRS->first_read_date = 0;
1833                         /* note motor start time if motor is not yet running */
1834                         DRS->spinup_date = jiffies;
1835                         data |= (0x10 << UNIT(current_drive));
1836                 }
1837         } else
1838                 if (FDCS->dor & (0x10 << UNIT(current_drive)))
1839                         mask &= ~(0x10 << UNIT(current_drive));
1840 
1841         /* starts motor and selects floppy */
1842         del_timer(motor_off_timer + current_drive);
1843         set_dor(fdc, mask, data);
1844 
1845         /* wait_for_completion also schedules reset if needed. */
1846         return(wait_for_completion(DRS->select_date+DP->select_delay,
1847                                    (timeout_fn) function));
1848 }
1849 
1850 static void floppy_ready(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1851 {
1852         CHECK_RESET;
1853         if (start_motor(floppy_ready)) return;
1854         if (fdc_dtr()) return;
1855 
1856 #ifdef DCL_DEBUG
1857         if (DP->flags & FD_DEBUG){
1858                 DPRINT("calling disk change from floppy_ready\n");
1859         }
1860 #endif
1861 
1862         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1863            disk_change(current_drive) &&
1864            !DP->select_delay)
1865                 twaddle(); /* this clears the dcl on certain drive/controller
1866                             * combinations */
1867 
1868         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1869                 perpendicular_mode();
1870                 fdc_specify(); /* must be done here because of hut, hlt ... */
1871                 seek_floppy();
1872         } else
1873                 setup_rw_floppy();
1874 }
1875 
1876 static void floppy_start(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1877 {
1878         reschedule_timeout(CURRENTD, "floppy start", 0);
1879 
1880         scandrives();
1881 #ifdef DCL_DEBUG
1882         if (DP->flags & FD_DEBUG){
1883                 DPRINT("setting NEWCHANGE in floppy_start\n");
1884         }
1885 #endif
1886         SETF(FD_DISK_NEWCHANGE);
1887         floppy_ready();
1888 }
1889 
1890 /*
1891  * ========================================================================
1892  * here ends the bottom half. Exported routines are:
1893  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1894  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1895  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1896  * and set_dor.
1897  * ========================================================================
1898  */
1899 /*
1900  * General purpose continuations.
1901  * ==============================
1902  */
1903 
1904 static void do_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1905 {
1906         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1907         cont = 0;
1908         command_status += 2;
1909         wake_up(&command_done);
1910 }
1911 
1912 static struct cont_t wakeup_cont={
1913         empty,
1914         do_wakeup,
1915         empty,
1916         (done_f)empty
1917 };
1918 
1919 static int wait_til_done(void (*handler)(void), int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
1920 {
1921         int ret;
1922 
1923         floppy_tq.routine = (void *)(void *) handler;
1924         queue_task(&floppy_tq, &tq_timer);
1925 
1926         cli();
1927         while(command_status < 2 && NO_SIGNAL){
1928                 is_alive("wait_til_done");
1929                 if (interruptible)
1930                         interruptible_sleep_on(&command_done);
1931                 else
1932                         sleep_on(&command_done);
1933         }
1934         if (command_status < 2){
1935                 floppy_shutdown(1);
1936                 sti();
1937                 process_fd_request();
1938                 return -EINTR;
1939         }
1940         sti();
1941 
1942         if (FDCS->reset)
1943                 command_status = FD_COMMAND_ERROR;
1944         if (command_status == FD_COMMAND_OKAY)
1945                 ret=0;
1946         else
1947                 ret=-EIO;
1948         command_status = FD_COMMAND_NONE;
1949         return ret;
1950 }
1951 
1952 static void generic_done(int result)
     /* [previous][next][first][last][top][bottom][index][help] */
1953 {
1954         command_status = result;
1955         cont = &wakeup_cont;
1956 }
1957 
1958 static void generic_success(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1959 {
1960         cont->done(1);
1961 }
1962 
1963 static void generic_failure(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1964 {
1965         cont->done(0);
1966 }
1967 
1968 static void success_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1969 {
1970         generic_success();
1971         cont->redo();
1972 }
1973 
1974 
1975 /*
1976  * formatting and rw support.
1977  * ==========================
1978  */
1979 
1980 static int next_valid_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1981 {
1982         int probed_format;
1983 
1984         probed_format = DRS->probed_format;
1985         while(1){
1986                 if (probed_format >= 8 ||
1987                      !DP->autodetect[probed_format]){
1988                         DRS->probed_format = 0;
1989                         return 1;
1990                 }
1991                 if (floppy_type[DP->autodetect[probed_format]].sect){
1992                         DRS->probed_format = probed_format;
1993                         return 0;
1994                 }
1995                 probed_format++;
1996         }
1997 }
1998 
1999 static void bad_flp_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2000 {
2001         if (probing){
2002                 DRS->probed_format++;
2003                 if (!next_valid_format())
2004                         return;
2005         }
2006         (*errors)++;
2007         INFBOUND(DRWE->badness, *errors);
2008         if (*errors > DP->max_errors.abort)
2009                 cont->done(0);
2010         if (*errors > DP->max_errors.reset)
2011                 FDCS->reset = 1;
2012         else if (*errors > DP->max_errors.recal)
2013                 DRS->track = NEED_2_RECAL;
2014 }
2015 
2016 static void set_floppy(kdev_t device)
     /* [previous][next][first][last][top][bottom][index][help] */
2017 {
2018         if (TYPE(device))
2019                 _floppy = TYPE(device) + floppy_type;
2020         else
2021                 _floppy = current_type[ DRIVE(device) ];
2022 }
2023 
2024 /*
2025  * formatting and support.
2026  * =======================
2027  */
2028 static void format_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2029 {
2030         switch (interpret_errors()){
2031                 case 1:
2032                         cont->error();
2033                 case 2:
2034                         break;
2035                 case 0:
2036                         cont->done(1);
2037         }
2038         cont->redo();
2039 }
2040 
2041 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2042 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
2043 #define CT(x) ((x) | 0x40)
2044 static void setup_format_params(int track)
     /* [previous][next][first][last][top][bottom][index][help] */
2045 {
2046         struct fparm {
2047                 unsigned char track,head,sect,size;
2048         } *here = (struct fparm *)floppy_track_buffer;
2049         int il,n;
2050         int count,head_shift,track_shift;
2051 
2052         raw_cmd = &default_raw_cmd;
2053         raw_cmd->track = track;
2054 
2055         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2056                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
2057         raw_cmd->rate = _floppy->rate & 0x43;
2058         raw_cmd->cmd_count = NR_F;
2059         COMMAND = FM_MODE(_floppy,FD_FORMAT);
2060         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy,format_req.head);
2061         F_SIZECODE = FD_SIZECODE(_floppy);
2062         F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2063         F_GAP = _floppy->fmt_gap;
2064         F_FILL = FD_FILL_BYTE;
2065 
2066         raw_cmd->kernel_data = floppy_track_buffer;
2067         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2068 
2069         /* allow for about 30ms for data transport per track */
2070         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
2071 
2072         /* a ``cylinder'' is two tracks plus a little stepping time */
2073         track_shift = 2 * head_shift + 3;
2074 
2075         /* position of logical sector 1 on this track */
2076         n = (track_shift * format_req.track + head_shift * format_req.head)
2077                 % F_SECT_PER_TRACK;
2078 
2079         /* determine interleave */
2080         il = 1;
2081         if (_floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2082                 il++;
2083 
2084         /* initialize field */
2085         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2086                 here[count].track = format_req.track;
2087                 here[count].head = format_req.head;
2088                 here[count].sect = 0;
2089                 here[count].size = F_SIZECODE;
2090         }
2091         /* place logical sectors */
2092         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2093                 here[n].sect = count;
2094                 n = (n+il) % F_SECT_PER_TRACK;
2095                 if (here[n].sect) { /* sector busy, find next free sector */
2096                         ++n;
2097                         if (n>= F_SECT_PER_TRACK) {
2098                                 n-=F_SECT_PER_TRACK;
2099                                 while (here[n].sect) ++n;
2100                         }
2101                 }
2102         }
2103 }
2104 
2105 static void redo_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2106 {
2107         buffer_track = -1;
2108         setup_format_params(format_req.track << STRETCH(_floppy));
2109         floppy_start();
2110 #ifdef DEBUGT
2111         debugt("queue format request");
2112 #endif
2113 }
2114 
2115 static struct cont_t format_cont={
2116         format_interrupt,
2117         redo_format,
2118         bad_flp_intr,
2119         generic_done };
2120 
2121 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /* [previous][next][first][last][top][bottom][index][help] */
2122 {
2123         int ret;
2124         int drive=DRIVE(device);
2125 
2126         LOCK_FDC(drive,1);
2127         set_floppy(device);
2128         if (!_floppy ||
2129             _floppy->track > DP->tracks ||
2130             tmp_format_req->track >= _floppy->track ||
2131             tmp_format_req->head >= _floppy->head ||
2132             (_floppy->sect << 2) % (1 <<  FD_SIZECODE(_floppy)) ||
2133             !_floppy->fmt_gap) {
2134                 process_fd_request();
2135                 return -EINVAL;
2136         }
2137         format_req = *tmp_format_req;
2138         format_errors = 0;
2139         cont = &format_cont;
2140         errors = &format_errors;
2141         IWAIT(redo_format);
2142         process_fd_request();
2143         return ret;
2144 }
2145 
2146 /*
2147  * Buffer read/write and support
2148  * =============================
2149  */
2150 
2151 /* new request_done. Can handle physical sectors which are smaller than a
2152  * logical buffer */
2153 static void request_done(int uptodate)
     /* [previous][next][first][last][top][bottom][index][help] */
2154 {
2155         int block;
2156 
2157         probing = 0;
2158         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2159 
2160         if (!CURRENT){
2161                 DPRINT("request list destroyed in floppy request done\n");
2162                 return;
2163         }
2164 
2165         if (uptodate){
2166                 /* maintain values for invalidation on geometry
2167                  * change */
2168                 block = current_count_sectors + CURRENT->sector;
2169                 INFBOUND(DRS->maxblock, block);
2170                 if (block > _floppy->sect)
2171                         DRS->maxtrack = 1;
2172 
2173                 /* unlock chained buffers */
2174                 while (current_count_sectors && CURRENT &&
2175                        current_count_sectors >= CURRENT->current_nr_sectors){
2176                         current_count_sectors -= CURRENT->current_nr_sectors;
2177                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2178                         CURRENT->sector += CURRENT->current_nr_sectors;
2179                         end_request(1);
2180                 }
2181                 if (current_count_sectors && CURRENT){
2182                         /* "unlock" last subsector */
2183                         CURRENT->buffer += current_count_sectors <<9;
2184                         CURRENT->current_nr_sectors -= current_count_sectors;
2185                         CURRENT->nr_sectors -= current_count_sectors;
2186                         CURRENT->sector += current_count_sectors;
2187                         return;
2188                 }
2189 
2190                 if (current_count_sectors && !CURRENT)
2191                         DPRINT("request list destroyed in floppy request done\n");
2192 
2193         } else {
2194                 if (CURRENT->cmd == WRITE) {
2195                         /* record write error information */
2196                         DRWE->write_errors++;
2197                         if (DRWE->write_errors == 1) {
2198                                 DRWE->first_error_sector = CURRENT->sector;
2199                                 DRWE->first_error_generation = DRS->generation;
2200                         }
2201                         DRWE->last_error_sector = CURRENT->sector;
2202                         DRWE->last_error_generation = DRS->generation;
2203                 }
2204                 end_request(0);
2205         }
2206 }
2207 
2208 /* Interrupt handler evaluating the result of the r/w operation */
2209 static void rw_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2210 {
2211         int nr_sectors, ssize, eoc;
2212 
2213         if (!DRS->first_read_date)
2214                 DRS->first_read_date = jiffies;
2215 
2216         nr_sectors = 0;
2217         CODE2SIZE;
2218 
2219         if(ST1 & ST1_EOC)
2220                 eoc = 1;
2221         else
2222                 eoc = 0;
2223         nr_sectors = ((R_TRACK-TRACK)*_floppy->head+R_HEAD-HEAD) *
2224                 _floppy->sect + ((R_SECTOR-SECTOR+eoc) <<  SIZECODE >> 2) -
2225                 (sector_t % _floppy->sect) % ssize;
2226 
2227 #ifdef FLOPPY_SANITY_CHECK
2228         if (nr_sectors > current_count_sectors + ssize -
2229              (current_count_sectors + sector_t) % ssize +
2230              sector_t % ssize){
2231                 DPRINT2("long rw: %x instead of %lx\n",
2232                         nr_sectors, current_count_sectors);
2233                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2234                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2235                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2236                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2237                        sector_t, ssize);
2238         }
2239 #endif
2240         INFBOUND(nr_sectors,0);
2241         SUPBOUND(current_count_sectors, nr_sectors);
2242 
2243         switch (interpret_errors()){
2244                 case 2:
2245                         cont->redo();
2246                         return;
2247                 case 1:
2248                         if (!current_count_sectors){
2249                                 cont->error();
2250                                 cont->redo();
2251                                 return;
2252                         }
2253                         break;
2254                 case 0:
2255                         if (!current_count_sectors){
2256                                 cont->redo();
2257                                 return;
2258                         }
2259                         current_type[current_drive] = _floppy;
2260                         floppy_sizes[TOMINOR(current_drive) ]= _floppy->size>>1;
2261                         break;
2262         }
2263 
2264         if (probing) {
2265                 if (DP->flags & FTD_MSG)
2266                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2267                                 _floppy->name,current_drive);
2268                 current_type[current_drive] = _floppy;
2269                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size >> 1;
2270                 probing = 0;
2271         }
2272 
2273         if (CT(COMMAND) != FD_READ || 
2274              raw_cmd->kernel_data == CURRENT->buffer){
2275                 /* transfer directly from buffer */
2276                 cont->done(1);
2277         } else if (CT(COMMAND) == FD_READ){
2278                 buffer_track = raw_cmd->track;
2279                 buffer_drive = current_drive;
2280                 INFBOUND(buffer_max, nr_sectors + sector_t);
2281         }
2282         cont->redo();
2283 }
2284 
2285 /* Compute maximal contiguous buffer size. */
2286 static int buffer_chain_size(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2287 {
2288         struct buffer_head *bh;
2289         int size;
2290         char *base;
2291 
2292         base = CURRENT->buffer;
2293         size = CURRENT->current_nr_sectors << 9;
2294         bh = CURRENT->bh;
2295 
2296         if (bh){
2297                 bh = bh->b_reqnext;
2298                 while (bh && bh->b_data == base + size){
2299                         size += bh->b_size;
2300                         bh = bh->b_reqnext;
2301                 }
2302         }
2303         return size >> 9;
2304 }
2305 
2306 /* Compute the maximal transfer size */
2307 static int transfer_size(int ssize, int max_sector, int max_size)
     /* [previous][next][first][last][top][bottom][index][help] */
2308 {
2309         SUPBOUND(max_sector, sector_t + max_size);
2310 
2311         /* alignment */
2312         max_sector -= (max_sector % _floppy->sect) % ssize;
2313 
2314         /* transfer size, beginning not aligned */
2315         current_count_sectors = max_sector - sector_t ;
2316 
2317         return max_sector;
2318 }
2319 
2320 /*
2321  * Move data from/to the track buffer to/from the buffer cache.
2322  */
2323 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /* [previous][next][first][last][top][bottom][index][help] */
2324 {
2325         int remaining; /* number of transferred 512-byte sectors */
2326         struct buffer_head *bh;
2327         char *buffer, *dma_buffer;
2328         int size;
2329 
2330         max_sector = transfer_size(ssize,
2331                                    minimum(max_sector, max_sector_2),
2332                                    CURRENT->nr_sectors);
2333 
2334         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2335             buffer_max > sector_t + CURRENT->nr_sectors)
2336                 current_count_sectors = minimum(buffer_max - sector_t,
2337                                                 CURRENT->nr_sectors);
2338 
2339         remaining = current_count_sectors << 9;
2340 #ifdef FLOPPY_SANITY_CHECK
2341         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2342             CT(COMMAND) == FD_WRITE){
2343                 DPRINT("in copy buffer\n");
2344                 printk("current_count_sectors=%ld\n", current_count_sectors);
2345                 printk("remaining=%d\n", remaining >> 9);
2346                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2347                 printk("CURRENT->current_nr_sectors=%ld\n",
2348                        CURRENT->current_nr_sectors);
2349                 printk("max_sector=%d\n", max_sector);
2350                 printk("ssize=%d\n", ssize);
2351         }
2352 #endif
2353 
2354         buffer_max = maximum(max_sector, buffer_max);
2355 
2356         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2357 
2358         bh = CURRENT->bh;
2359         size = CURRENT->current_nr_sectors << 9;
2360         buffer = CURRENT->buffer;
2361 
2362         while (remaining > 0){
2363                 SUPBOUND(size, remaining);
2364 #ifdef FLOPPY_SANITY_CHECK
2365                 if (dma_buffer + size >
2366                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2367                     dma_buffer < floppy_track_buffer){
2368                         DPRINT1("buffer overrun in copy buffer %d\n",
2369                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2370                         printk("sector_t=%d buffer_min=%d\n",
2371                                sector_t, buffer_min);
2372                         printk("current_count_sectors=%ld\n",
2373                                current_count_sectors);
2374                         if (CT(COMMAND) == FD_READ)
2375                                 printk("read\n");
2376                         if (CT(COMMAND) == FD_READ)
2377                                 printk("write\n");
2378                         break;
2379                 }
2380                 if (((unsigned long)buffer) % 512)
2381                         DPRINT1("%p buffer not aligned\n", buffer);
2382 #endif
2383                 if (CT(COMMAND) == FD_READ) {
2384                         fd_cacheflush(dma_buffer, size);
2385                         memcpy(buffer, dma_buffer, size);
2386                 } else {
2387                         memcpy(dma_buffer, buffer, size);
2388                         fd_cacheflush(dma_buffer, size);
2389                 }
2390                 remaining -= size;
2391                 if (!remaining)
2392                         break;
2393 
2394                 dma_buffer += size;
2395                 bh = bh->b_reqnext;
2396 #ifdef FLOPPY_SANITY_CHECK
2397                 if (!bh){
2398                         DPRINT("bh=null in copy buffer after copy\n");
2399                         break;
2400                 }
2401 #endif
2402                 size = bh->b_size;
2403                 buffer = bh->b_data;
2404         }
2405 #ifdef FLOPPY_SANITY_CHECK
2406         if (remaining){
2407                 if (remaining > 0)
2408                         max_sector -= remaining >> 9;
2409                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2410         }
2411 #endif
2412 }
2413 
2414 /*
2415  * Formulate a read/write request.
2416  * this routine decides where to load the data (directly to buffer, or to
2417  * tmp floppy area), how much data to load (the size of the buffer, the whole
2418  * track, or a single sector)
2419  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2420  * allocation on the fly, it should be done here. No other part should need
2421  * modification.
2422  */
2423 
2424 static int make_raw_rw_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2425 {
2426         int aligned_sector_t;
2427         int max_sector, max_size, tracksize, ssize;
2428 
2429         set_fdc(DRIVE(CURRENT->rq_dev));
2430 
2431         raw_cmd = &default_raw_cmd;
2432         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2433                 FD_RAW_NEED_SEEK;
2434         raw_cmd->cmd_count = NR_RW;
2435         if (CURRENT->cmd == READ){
2436                 raw_cmd->flags |= FD_RAW_READ;
2437                 COMMAND = FM_MODE(_floppy,FD_READ);
2438         } else if (CURRENT->cmd == WRITE){
2439                 raw_cmd->flags |= FD_RAW_WRITE;
2440                 COMMAND = FM_MODE(_floppy,FD_WRITE);
2441         } else {
2442                 DPRINT("make_raw_rw_request: unknown command\n");
2443                 return 0;
2444         }
2445 
2446         max_sector = _floppy->sect * _floppy->head;
2447 
2448         TRACK = CURRENT->sector / max_sector;
2449         sector_t = CURRENT->sector % max_sector;
2450         if (_floppy->track && TRACK >= _floppy->track)
2451                 return 0;
2452         HEAD = sector_t / _floppy->sect;
2453 
2454         if (((_floppy->stretch & FD_SWAPSIDES) || TESTF(FD_NEED_TWADDLE)) &&
2455             sector_t < _floppy->sect)
2456                 max_sector = _floppy->sect;
2457 
2458         /* 2M disks have phantom sectors on the first track */
2459         if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)){
2460                 max_sector = 2 * _floppy->sect / 3;
2461                 if (sector_t >= max_sector){
2462                         current_count_sectors = minimum(_floppy->sect - sector_t,
2463                                                         CURRENT->nr_sectors);
2464                         return 1;
2465                 }
2466                 SIZECODE = 2;
2467         } else
2468                 SIZECODE = FD_SIZECODE(_floppy);
2469         raw_cmd->rate = _floppy->rate & 0x43;
2470         if ((_floppy->rate & FD_2M) &&
2471             (TRACK || HEAD) &&
2472             raw_cmd->rate == 2)
2473                 raw_cmd->rate = 1;
2474 
2475         if (SIZECODE)
2476                 SIZECODE2 = 0xff;
2477         else
2478                 SIZECODE2 = 0x80;
2479         raw_cmd->track = TRACK << STRETCH(_floppy);
2480         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy,HEAD);
2481         GAP = _floppy->gap;
2482         CODE2SIZE;
2483         SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2484         SECTOR = ((sector_t % _floppy->sect) << 2 >> SIZECODE) + 1;
2485         tracksize = _floppy->sect - _floppy->sect % ssize;
2486         if (tracksize < _floppy->sect){
2487                 SECT_PER_TRACK ++;
2488                 if (tracksize <= sector_t % _floppy->sect)
2489                         SECTOR--;
2490                 while (tracksize <= sector_t % _floppy->sect){
2491                         while(tracksize + ssize > _floppy->sect){
2492                                 SIZECODE--;
2493                                 ssize >>= 1;
2494                         }
2495                         SECTOR++; SECT_PER_TRACK ++;
2496                         tracksize += ssize;
2497                 }
2498                 max_sector = HEAD * _floppy->sect + tracksize;
2499         } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing)
2500                 max_sector = _floppy->sect;
2501 
2502         aligned_sector_t = sector_t - (sector_t % _floppy->sect) % ssize;
2503         max_size = CURRENT->nr_sectors;
2504         if ((raw_cmd->track == buffer_track) && 
2505             (current_drive == buffer_drive) &&
2506             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2507                 /* data already in track buffer */
2508                 if (CT(COMMAND) == FD_READ) {
2509                         copy_buffer(1, max_sector, buffer_max);
2510                         return 1;
2511                 }
2512         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2513                 if (CT(COMMAND) == FD_WRITE){
2514                         if (sector_t + CURRENT->nr_sectors > ssize &&
2515                             sector_t + CURRENT->nr_sectors < ssize + ssize)
2516                                 max_size = ssize + ssize;
2517                         else
2518                                 max_size = ssize;
2519                 }
2520                 raw_cmd->flags &= ~FD_RAW_WRITE;
2521                 raw_cmd->flags |= FD_RAW_READ;
2522                 COMMAND = FM_MODE(_floppy,FD_READ);
2523         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS) {
2524                 unsigned long dma_limit;
2525                 int direct, indirect;
2526 
2527                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2528                         sector_t;
2529 
2530                 /*
2531                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2532                  * on a 64 bit machine!
2533                  */
2534                 max_size = buffer_chain_size();
2535                 dma_limit = (MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer)) >> 9;
2536                 if ((unsigned long) max_size > dma_limit) {
2537                         max_size = dma_limit;
2538                 }
2539                 /* 64 kb boundaries */
2540                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2541                         max_size = (K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2542                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2543                 /*
2544                  * We try to read tracks, but if we get too many errors, we
2545                  * go back to reading just one sector at a time.
2546                  *
2547                  * This means we should be able to read a sector even if there
2548                  * are other bad sectors on this track.
2549                  */
2550                 if (!direct ||
2551                     (indirect * 2 > direct * 3 &&
2552                      *errors < DP->max_errors.read_track &&
2553                      /*!TESTF(FD_NEED_TWADDLE) &&*/
2554                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2555                         max_size = CURRENT->nr_sectors;
2556                 } else {
2557                         raw_cmd->kernel_data = CURRENT->buffer;
2558                         raw_cmd->length = current_count_sectors << 9;
2559                         if (raw_cmd->length == 0){
2560                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2561                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2562                                         indirect, direct, sector_t);
2563                                 return 0;
2564                         }
2565                         return 2;
2566                 }
2567         }
2568 
2569         if (CT(COMMAND) == FD_READ)
2570                 max_size = max_sector; /* unbounded */
2571 
2572         /* claim buffer track if needed */
2573         if (buffer_track != raw_cmd->track ||  /* bad track */
2574             buffer_drive !=current_drive || /* bad drive */
2575             sector_t > buffer_max ||
2576             sector_t < buffer_min ||
2577             ((CT(COMMAND) == FD_READ ||
2578               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize))&&
2579              max_sector > 2 * max_buffer_sectors + buffer_min &&
2580              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2581             /* not enough space */){
2582                 buffer_track = -1;
2583                 buffer_drive = current_drive;
2584                 buffer_max = buffer_min = aligned_sector_t;
2585         }
2586         raw_cmd->kernel_data = floppy_track_buffer + 
2587                 ((aligned_sector_t-buffer_min)<<9);
2588 
2589         if (CT(COMMAND) == FD_WRITE){
2590                 /* copy write buffer to track buffer.
2591                  * if we get here, we know that the write
2592                  * is either aligned or the data already in the buffer
2593                  * (buffer will be overwritten) */
2594 #ifdef FLOPPY_SANITY_CHECK
2595                 if (sector_t != aligned_sector_t && buffer_track == -1)
2596                         DPRINT("internal error offset !=0 on write\n");
2597 #endif
2598                 buffer_track = raw_cmd->track;
2599                 buffer_drive = current_drive;
2600                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2601         } else
2602                 transfer_size(ssize, max_sector,
2603                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2604 
2605         /* round up current_count_sectors to get dma xfer size */
2606         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2607         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2608         raw_cmd->length <<= 9;
2609 #ifdef FLOPPY_SANITY_CHECK
2610         if ((raw_cmd->length < current_count_sectors << 9) ||
2611             (raw_cmd->kernel_data != CURRENT->buffer &&
2612              CT(COMMAND) == FD_WRITE &&
2613              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2614               aligned_sector_t < buffer_min)) ||
2615             raw_cmd->length % (128 << SIZECODE) ||
2616             raw_cmd->length <= 0 || current_count_sectors <= 0){
2617                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2618                         raw_cmd->length, current_count_sectors);
2619                 if (raw_cmd->kernel_data != CURRENT->buffer)
2620                         printk("addr=%d, length=%ld\n",
2621                                (int) ((raw_cmd->kernel_data - 
2622                                        floppy_track_buffer) >> 9),
2623                                current_count_sectors);
2624                 printk("st=%d ast=%d mse=%d msi=%d\n",
2625                        sector_t, aligned_sector_t, max_sector, max_size);
2626                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2627                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2628                        COMMAND, SECTOR, HEAD, TRACK);
2629                 printk("buffer drive=%d\n", buffer_drive);
2630                 printk("buffer track=%d\n", buffer_track);
2631                 printk("buffer_min=%d\n", buffer_min);
2632                 printk("buffer_max=%d\n", buffer_max);
2633                 return 0;
2634         }
2635 
2636         if (raw_cmd->kernel_data != CURRENT->buffer){
2637                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2638                     current_count_sectors < 0 ||
2639                     raw_cmd->length < 0 ||
2640                     raw_cmd->kernel_data + raw_cmd->length >
2641                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2642                         DPRINT("buffer overrun in schedule dma\n");
2643                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2644                                sector_t, buffer_min,
2645                                raw_cmd->length >> 9);
2646                         printk("current_count_sectors=%ld\n",
2647                                current_count_sectors);
2648                         if (CT(COMMAND) == FD_READ)
2649                                 printk("read\n");
2650                         if (CT(COMMAND) == FD_READ)
2651                                 printk("write\n");
2652                         return 0;
2653                 }
2654         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2655                    current_count_sectors > CURRENT->nr_sectors){
2656                 DPRINT("buffer overrun in direct transfer\n");
2657                 return 0;
2658         } else if (raw_cmd->length < current_count_sectors << 9){
2659                 DPRINT("more sectors than bytes\n");
2660                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2661                 printk("sectors=%ld\n", current_count_sectors);
2662         }
2663         if (raw_cmd->length == 0){
2664                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2665                 return 0;
2666         }
2667 #endif
2668         return 2;
2669 }
2670 
2671 static void redo_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2672 {
2673 #define REPEAT {request_done(0); continue; }
2674         kdev_t device;
2675         int tmp;
2676 
2677         lastredo = jiffies;
2678         if (current_drive < N_DRIVE)
2679                 floppy_off(current_drive);
2680 
2681         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2682                 CLEAR_INTR;
2683                 unlock_fdc();
2684                 return;
2685         }
2686 
2687         while(1){
2688                 if (!CURRENT) {
2689                         CLEAR_INTR;
2690                         unlock_fdc();
2691                         return;
2692                 }
2693                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2694                         panic(DEVICE_NAME ": request list destroyed");
2695                 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
2696                         panic(DEVICE_NAME ": block not locked");
2697 
2698                 device = CURRENT->rq_dev;
2699                 set_fdc(DRIVE(device));
2700                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2701 
2702                 set_floppy(device);
2703                 raw_cmd = & default_raw_cmd;
2704                 raw_cmd->flags = 0;
2705                 if (start_motor(redo_fd_request)) return;
2706                 if (test_bit(current_drive, &fake_change) ||
2707                    TESTF(FD_DISK_CHANGED)){
2708                         DPRINT("disk absent or changed during operation\n");
2709                         REPEAT;
2710                 }
2711                 if (!_floppy) { /* Autodetection */
2712                         if (!probing){
2713                                 DRS->probed_format = 0;
2714                                 if (next_valid_format()){
2715                                         DPRINT("no autodetectable formats\n");
2716                                         _floppy = NULL;
2717                                         REPEAT;
2718                                 }
2719                         }
2720                         probing = 1;
2721                         _floppy = floppy_type+DP->autodetect[DRS->probed_format];
2722                 } else
2723                         probing = 0;
2724                 errors = & (CURRENT->errors);
2725                 tmp = make_raw_rw_request();
2726                 if (tmp < 2){
2727                         request_done(tmp);
2728                         continue;
2729                 }
2730 
2731                 if (TESTF(FD_NEED_TWADDLE))
2732                         twaddle();
2733                 floppy_tq.routine = (void *)(void *) floppy_start;
2734                 queue_task(&floppy_tq, &tq_timer);
2735 #ifdef DEBUGT
2736                 debugt("queue fd request");
2737 #endif
2738                 return;
2739         }
2740 #undef REPEAT
2741 }
2742 
2743 static struct cont_t rw_cont={
2744         rw_interrupt,
2745         redo_fd_request,
2746         bad_flp_intr,
2747         request_done };
2748 
2749 static struct tq_struct request_tq =
2750 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2751 
2752 static void process_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2753 {
2754         cont = &rw_cont;
2755         queue_task(&request_tq, &tq_timer);
2756 }
2757 
2758 static void do_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2759 {
2760         if (fdc_busy){
2761                 /* fdc busy, this new request will be treated when the
2762                    current one is done */
2763                 is_alive("do fd request, old request running");
2764                 return;
2765         }
2766         lock_fdc(MAXTIMEOUT,0);
2767         process_fd_request();
2768         is_alive("do fd request");
2769 }
2770 
2771 static struct cont_t poll_cont={
2772         success_and_wakeup,
2773         floppy_ready,
2774         generic_failure,
2775         generic_done };
2776 
2777 static int poll_drive(int interruptible, int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2778 {
2779         int ret;
2780         /* no auto-sense, just clear dcl */
2781         raw_cmd = &default_raw_cmd;
2782         raw_cmd->flags= flag;
2783         raw_cmd->track=0;
2784         raw_cmd->cmd_count=0;
2785         cont = &poll_cont;
2786 #ifdef DCL_DEBUG
2787         if (DP->flags & FD_DEBUG){
2788                 DPRINT("setting NEWCHANGE in poll_drive\n");
2789         }
2790 #endif
2791         SETF(FD_DISK_NEWCHANGE);
2792         WAIT(floppy_ready);
2793         return ret;
2794 }
2795 
2796 /*
2797  * User triggered reset
2798  * ====================
2799  */
2800 
2801 static void reset_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2802 {
2803         printk("weird, reset interrupt called\n");
2804 }
2805 
2806 static struct cont_t reset_cont={
2807         reset_intr,
2808         success_and_wakeup,
2809         generic_failure,
2810         generic_done };
2811 
2812 static int user_reset_fdc(int drive, int arg, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
2813 {
2814         int ret;
2815 
2816         ret=0;
2817         LOCK_FDC(drive,interruptible);
2818         if (arg == FD_RESET_ALWAYS)
2819                 FDCS->reset=1;
2820         if (FDCS->reset){
2821                 cont = &reset_cont;
2822                 WAIT(reset_fdc);
2823         }
2824         process_fd_request();
2825         return ret;
2826 }
2827 
2828 /*
2829  * Misc Ioctl's and support
2830  * ========================
2831  */
2832 static int fd_copyout(void *param, const void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2833 {
2834         int ret;
2835 
2836         ECALL(verify_area(VERIFY_WRITE,param,size));
2837         fd_cacheflush(address, size); /* is this necessary ??? */
2838         /* Ralf: Yes; only the l2 cache is completely chipset
2839            controlled */
2840         memcpy_tofs(param,(void *) address, size);
2841         return 0;
2842 }
2843 
2844 static int fd_copyin(void *param, void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2845 {
2846         int ret;
2847 
2848         ECALL(verify_area(VERIFY_READ,param,size));
2849         memcpy_fromfs((void *) address, param, size);
2850         return 0;
2851 }
2852 
2853 #define COPYOUT(x) ECALL(fd_copyout((void *)param, &(x), sizeof(x)))
2854 #define COPYIN(x) ECALL(fd_copyin((void *)param, &(x), sizeof(x)))
2855 
2856 static inline const char *drive_name(int type, int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
2857 {
2858         struct floppy_struct *floppy;
2859 
2860         if (type)
2861                 floppy = floppy_type + type;
2862         else {
2863                 if (UDP->native_format)
2864                         floppy = floppy_type + UDP->native_format;
2865                 else
2866                         return "(null)";
2867         }
2868         if (floppy->name)
2869                 return floppy->name;
2870         else
2871                 return "(null)";
2872 }
2873 
2874 
2875 /* raw commands */
2876 static void raw_cmd_done(int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2877 {
2878         int i;
2879 
2880         if (!flag) {
2881                 raw_cmd->flags = FD_RAW_FAILURE;
2882                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2883         } else {
2884                 raw_cmd->reply_count = inr;
2885                 for (i=0; i< raw_cmd->reply_count; i++)
2886                         raw_cmd->reply[i] = reply_buffer[i];
2887 
2888                 if (raw_cmd->flags & (FD_RAW_READ | FD_RAW_WRITE))
2889                         raw_cmd->length = fd_get_dma_residue();
2890                 
2891                 if ((raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2892                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2893                         raw_cmd->flags |= FD_RAW_FAILURE;
2894 
2895                 if (disk_change(current_drive))
2896                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2897                 else
2898                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2899                 if (raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2900                         motor_off_callback(current_drive);
2901 
2902                 if (raw_cmd->next &&
2903                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2904                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2905                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2906                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2907                         raw_cmd = raw_cmd->next;
2908                         return;
2909                 }
2910         }
2911         generic_done(flag);
2912 }
2913 
2914 
2915 static struct cont_t raw_cmd_cont={
2916         success_and_wakeup,
2917         floppy_start,
2918         generic_failure,
2919         raw_cmd_done
2920 };
2921 
2922 static inline int raw_cmd_copyout(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2923                                   struct floppy_raw_cmd *ptr)
2924 {
2925         struct old_floppy_raw_cmd old_raw_cmd;
2926         int ret;
2927 
2928         while(ptr) {
2929                 if (cmd == OLDFDRAWCMD) {
2930                         old_raw_cmd.flags = ptr->flags;
2931                         old_raw_cmd.data = ptr->data;
2932                         old_raw_cmd.length = ptr->length;
2933                         old_raw_cmd.rate = ptr->rate;
2934                         old_raw_cmd.reply_count = ptr->reply_count;
2935                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2936                         COPYOUT(old_raw_cmd);
2937                         param += sizeof(old_raw_cmd);
2938                 } else {
2939                         COPYOUT(*ptr);
2940                         param += sizeof(struct floppy_raw_cmd);
2941                 }
2942 
2943                 if ((ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2944                         if (ptr->length>=0 && ptr->length<=ptr->buffer_length)
2945                                 ECALL(fd_copyout(ptr->data, 
2946                                                  ptr->kernel_data, 
2947                                                  ptr->buffer_length - 
2948                                                  ptr->length));
2949                 }
2950                 ptr = ptr->next;
2951         }
2952         return 0;
2953 }
2954 
2955 
2956 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /* [previous][next][first][last][top][bottom][index][help] */
2957 {
2958         struct floppy_raw_cmd *next,*this;
2959 
2960         this = *ptr;
2961         *ptr = 0;
2962         while(this) {
2963                 if (this->buffer_length) {
2964                         free_pages((unsigned long)this->kernel_data,
2965                                    __get_order(this->buffer_length));
2966                         this->buffer_length = 0;
2967                 }
2968                 next = this->next;
2969                 kfree(this);
2970                 this = next;
2971         }
2972 }
2973 
2974 
2975 static inline int raw_cmd_copyin(int cmd, char *param,
     /* [previous][next][first][last][top][bottom][index][help] */
2976                                  struct floppy_raw_cmd **rcmd)
2977 {
2978         struct floppy_raw_cmd *ptr;
2979         struct old_floppy_raw_cmd old_raw_cmd;
2980         int ret;
2981         int i;
2982         
2983         *rcmd = 0;
2984         while(1) {
2985                 ptr = (struct floppy_raw_cmd *) 
2986                         kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
2987                 if (!ptr)
2988                         return -ENOMEM;
2989                 *rcmd = ptr;
2990                 if (cmd == OLDFDRAWCMD){
2991                         COPYIN(old_raw_cmd);
2992                         ptr->flags = old_raw_cmd.flags;
2993                         ptr->data = old_raw_cmd.data;
2994                         ptr->length = old_raw_cmd.length;
2995                         ptr->rate = old_raw_cmd.rate;
2996                         ptr->cmd_count = old_raw_cmd.cmd_count;
2997                         ptr->track = old_raw_cmd.track;
2998                         ptr->phys_length = 0;
2999                         ptr->next = 0;
3000                         ptr->buffer_length = 0;
3001                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
3002                         param += sizeof(struct old_floppy_raw_cmd);
3003                         if (ptr->cmd_count > 9)
3004                                 return -EINVAL;
3005                 } else {
3006                         COPYIN(*ptr);
3007                         ptr->next = 0;
3008                         ptr->buffer_length = 0;
3009                         param += sizeof(struct floppy_raw_cmd);
3010                         if (ptr->cmd_count > 16)
3011                                 return -EINVAL;
3012                 }
3013 
3014                 for (i=0; i< 16; i++)
3015                         ptr->reply[i] = 0;
3016                 ptr->resultcode = 0;
3017                 ptr->kernel_data = 0;
3018 
3019                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3020                         if (ptr->length <= 0)
3021                                 return -EINVAL;
3022                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
3023                         if (!ptr->kernel_data)
3024                                 return -ENOMEM;
3025                         ptr->buffer_length = ptr->length;
3026                 }
3027                 if ( ptr->flags & FD_RAW_READ )
3028                     ECALL( verify_area( VERIFY_WRITE, ptr->data, 
3029                                         ptr->length ));
3030                 if (ptr->flags & FD_RAW_WRITE)
3031                         ECALL(fd_copyin(ptr->data, ptr->kernel_data, 
3032                                         ptr->length));
3033                 rcmd = & (ptr->next);
3034                 if (!(ptr->flags & FD_RAW_MORE))
3035                         return 0;
3036                 ptr->rate &= 0x43;
3037         }
3038 }
3039 
3040 
3041 static int raw_cmd_ioctl(int cmd, void *param)
     /* [previous][next][first][last][top][bottom][index][help] */
3042 {
3043         int drive, ret, ret2;
3044         struct floppy_raw_cmd *my_raw_cmd;
3045 
3046         if (FDCS->rawcmd <= 1)
3047                 FDCS->rawcmd = 1;
3048         for (drive= 0; drive < N_DRIVE; drive++){
3049                 if (FDC(drive) != fdc)
3050                         continue;
3051                 if (drive == current_drive){
3052                         if (UDRS->fd_ref > 1){
3053                                 FDCS->rawcmd = 2;
3054                                 break;
3055                         }
3056                 } else if (UDRS->fd_ref){
3057                         FDCS->rawcmd = 2;
3058                         break;
3059                 }
3060         }
3061 
3062         if (FDCS->reset)
3063                 return -EIO;
3064 
3065         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3066         if (ret) {
3067                 raw_cmd_free(&my_raw_cmd);
3068                 return ret;
3069         }
3070 
3071         raw_cmd = my_raw_cmd;
3072         cont = &raw_cmd_cont;
3073         ret=wait_til_done(floppy_start,1);
3074 #ifdef DCL_DEBUG
3075         if (DP->flags & FD_DEBUG){
3076                 DPRINT("calling disk change from raw_cmd ioctl\n");
3077         }
3078 #endif
3079 
3080         if (ret != -EINTR && FDCS->reset)
3081                 ret = -EIO;
3082 
3083         DRS->track = NO_TRACK;
3084 
3085         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3086         if (!ret)
3087                 ret = ret2;
3088         raw_cmd_free(&my_raw_cmd);
3089         return ret;
3090 }
3091 
3092 static int invalidate_drive(kdev_t rdev)
     /* [previous][next][first][last][top][bottom][index][help] */
3093 {
3094         /* invalidate the buffer track to force a reread */
3095         set_bit(DRIVE(rdev), &fake_change);
3096         process_fd_request();
3097         check_disk_change(rdev);
3098         return 0;
3099 }
3100 
3101 
3102 static inline void clear_write_error(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
3103 {
3104         CLEARSTRUCT(UDRWE);
3105 }
3106 
3107 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
     /* [previous][next][first][last][top][bottom][index][help] */
3108                                int drive, int type, kdev_t device)
3109 {
3110         int cnt;
3111 
3112         /* sanity checking for parameters.*/
3113         if (g->sect <= 0 ||
3114             g->head <= 0 ||
3115             g->track <= 0 ||
3116             g->track > UDP->tracks>>STRETCH(g) ||
3117             /* check if reserved bits are set */
3118             (g->stretch&~(FD_STRETCH|FD_SWAPSIDES)) != 0)
3119                 return -EINVAL;
3120         if (type){
3121                 if (!suser())
3122                         return -EPERM;
3123                 LOCK_FDC(drive,1);
3124                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3125                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3126                             drive_state[cnt].fd_ref)
3127                                 set_bit(drive, &fake_change);
3128                 }
3129                 floppy_type[type] = *g;
3130                 floppy_type[type].name="user format";
3131                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3132                         floppy_sizes[cnt]= floppy_sizes[cnt+0x80]=
3133                                 floppy_type[type].size>>1;
3134                 process_fd_request();
3135                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3136                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3137                             drive_state[cnt].fd_ref)
3138                                 check_disk_change(
3139                                         MKDEV(FLOPPY_MAJOR,
3140                                               drive_state[cnt].fd_device));
3141                 }
3142         } else {
3143                 LOCK_FDC(drive,1);
3144                 if (cmd != FDDEFPRM)
3145                         /* notice a disk change immediately, else
3146                          * we loose our settings immediately*/
3147                         CALL(poll_drive(1,0));
3148                 user_params[drive] = *g;
3149                 if (buffer_drive == drive)
3150                         SUPBOUND(buffer_max, user_params[drive].sect);
3151                 current_type[drive] = &user_params[drive];
3152                 floppy_sizes[drive] = user_params[drive].size >> 1;
3153                 if (cmd == FDDEFPRM)
3154                         DRS->keep_data = -1;
3155                 else
3156                         DRS->keep_data = 1;
3157                 /* invalidation. Invalidate only when needed, i.e.
3158                  * when there are already sectors in the buffer cache
3159                  * whose number will change. This is useful, because
3160                  * mtools often changes the geometry of the disk after
3161                  * looking at the boot block */
3162                 if (DRS->maxblock > user_params[drive].sect || DRS->maxtrack)
3163                         invalidate_drive(device);
3164                 else
3165                         process_fd_request();
3166         }
3167         return 0;
3168 }
3169 
3170 /* handle obsolete ioctl's */
3171 static struct translation_entry {
3172     int newcmd;
3173     int oldcmd;
3174     int oldsize; /* size of 0x00xx-style ioctl. Reflects old structures, thus
3175                   * use numeric values. NO SIZEOFS */
3176 } translation_table[]= {
3177     {FDCLRPRM,           0,  0},
3178     {FDSETPRM,           1, 28},
3179     {FDDEFPRM,           2, 28},
3180     {FDGETPRM,           3, 28},
3181     {FDMSGON,            4,  0},
3182     {FDMSGOFF,           5,  0},
3183     {FDFMTBEG,           6,  0},
3184     {FDFMTTRK,           7, 12},
3185     {FDFMTEND,           8,  0},
3186     {FDSETEMSGTRESH,    10,  0},
3187     {FDFLUSH,           11,  0},
3188     {FDSETMAXERRS,      12, 20},
3189     {OLDFDRAWCMD,       30,  0},
3190     {FDGETMAXERRS,      14, 20},
3191     {FDGETDRVTYP,       16, 16},
3192     {FDSETDRVPRM,       20, 88},
3193     {FDGETDRVPRM,       21, 88},
3194     {FDGETDRVSTAT,      22, 52},
3195     {FDPOLLDRVSTAT,     23, 52},
3196     {FDRESET,           24,  0},
3197     {FDGETFDCSTAT,      25, 40},
3198     {FDWERRORCLR,       27,  0},
3199     {FDWERRORGET,       28, 24},
3200     {FDRAWCMD,           0,  0},
3201     {FDEJECT,            0,  0},
3202     {FDTWADDLE,         40,  0} };
3203 
3204 static inline int normalize_0x02xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3205 {
3206         int i;
3207 
3208         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3209                 if ((*cmd & 0xffff) == (translation_table[i].newcmd & 0xffff)){
3210                         *size = _IOC_SIZE(*cmd);
3211                         *cmd = translation_table[i].newcmd;
3212                         if (*size > _IOC_SIZE(*cmd)) {
3213                                 printk("ioctl not yet supported\n");
3214                                 return -EFAULT;
3215                         }
3216                         return 0;
3217                 }
3218         }
3219         return -EINVAL;
3220 }
3221 
3222 static inline int xlate_0x00xx_ioctl(int *cmd, int *size)
     /* [previous][next][first][last][top][bottom][index][help] */
3223 {
3224         int i;
3225         /* old ioctls' for kernels <= 1.3.33 */
3226         /* When the next even release will come around, we'll start
3227          * warning against these.
3228          * When the next odd release will come around, we'll fail with
3229          * -EINVAL */
3230         if(strcmp(system_utsname.version, "1.4.0") >= 0)
3231                 printk("obsolete floppy ioctl %x\n", *cmd);
3232         if((system_utsname.version[0] == '1' &&
3233             strcmp(system_utsname.version, "1.5.0") >= 0) ||
3234            (system_utsname.version[0] >= '2' &&
3235             strcmp(system_utsname.version, "2.1.0") >= 0))
3236                 return -EINVAL;
3237         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3238                 if (*cmd == translation_table[i].oldcmd) {
3239                         *size = translation_table[i].oldsize;
3240                         *cmd = translation_table[i].newcmd;
3241                         return 0;
3242                 }
3243         }
3244         return -EINVAL;
3245 }
3246 
3247 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /* [previous][next][first][last][top][bottom][index][help] */
3248                     unsigned long param)
3249 {
3250 #define IOCTL_MODE_BIT 8
3251 #define OPEN_WRITE_BIT 16
3252 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3253 #define OUT(c,x) case c: outparam = (const char *) (x); break
3254 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3255 
3256         int i,drive,type;
3257         kdev_t device;
3258         int ret;
3259         int size;
3260         union inparam {
3261                 struct floppy_struct g; /* geometry */
3262                 struct format_descr f;
3263                 struct floppy_max_errors max_errors;
3264                 struct floppy_drive_params dp;
3265         } inparam; /* parameters coming from user space */
3266         const char *outparam; /* parameters passed back to user space */
3267 
3268         device = inode->i_rdev;
3269         switch (cmd) {
3270                 RO_IOCTLS(device,param);
3271         }
3272         type = TYPE(device);
3273         drive = DRIVE(device);
3274 
3275         /* convert compatibility eject ioctls into floppy eject ioctl.
3276          * We do this in order to provide a means to eject floppy disks before
3277          * installing the new fdutils package */
3278         if(cmd == CDROMEJECT || /* CD-Rom eject */
3279            cmd == 0x6470 /* SunOS floppy eject */) {
3280                 DPRINT("obsolete eject ioctl\n");
3281                 DPRINT("please use floppycontrol --eject\n");
3282                 cmd = FDEJECT;
3283         }
3284 
3285         /* convert the old style command into a new style command */
3286         if ((cmd & 0xff00) == 0x0200) {
3287                 ECALL(normalize_0x02xx_ioctl(&cmd, &size));
3288         } else if ((cmd & 0xff00) == 0x0000) {
3289                 ECALL(xlate_0x00xx_ioctl(&cmd, &size));
3290         } else
3291                 return -EINVAL;
3292 
3293         /* permission checks */
3294         if (((cmd & 0x80) && !suser()) ||
3295              ((cmd & 0x40) && !IOCTL_ALLOWED))
3296                 return -EPERM;
3297 
3298         /* verify writability of result, and fail early */
3299         if (_IOC_DIR(cmd) & _IOC_READ)
3300                 ECALL(verify_area(VERIFY_WRITE,(void *) param, size));
3301                 
3302         /* copyin */
3303         CLEARSTRUCT(&inparam);
3304         if (_IOC_DIR(cmd) & _IOC_WRITE)
3305                 ECALL(fd_copyin((void *)param, &inparam, size))
3306 
3307         switch (cmd) {
3308                 case FDEJECT:
3309                         if(UDRS->fd_ref != 1)
3310                                 /* somebody else has this drive open */
3311                                 return -EBUSY;
3312                         LOCK_FDC(drive,1);
3313 
3314                         /* do the actual eject. Fails on
3315                          * non-Sparc architectures */
3316                         ret=fd_eject(UNIT(drive)); 
3317 
3318                         /* switch the motor off, in order to make the
3319                          * cached DOR status match the hard DOS status
3320                          */
3321                         motor_off_callback(drive);
3322 
3323                         USETF(FD_DISK_CHANGED);
3324                         USETF(FD_VERIFY);
3325                         process_fd_request();
3326                         return ret;                     
3327                 case FDCLRPRM:
3328                         LOCK_FDC(drive,1);
3329                         current_type[drive] = NULL;
3330                         floppy_sizes[drive] = MAX_DISK_SIZE;
3331                         UDRS->keep_data = 0;
3332                         return invalidate_drive(device);
3333                 case FDSETPRM:
3334                 case FDDEFPRM:
3335                         return set_geometry(cmd, & inparam.g,
3336                                             drive, type, device);
3337                 case FDGETPRM:
3338                         if (type)
3339                                 outparam = (char *) &floppy_type[type];
3340                         else 
3341                                 outparam = (char *) current_type[drive];
3342                         if(!outparam)
3343                                 return -ENODEV;
3344                         break;
3345 
3346                 case FDMSGON:
3347                         UDP->flags |= FTD_MSG;
3348                         return 0;
3349                 case FDMSGOFF:
3350                         UDP->flags &= ~FTD_MSG;
3351                         return 0;
3352 
3353                 case FDFMTBEG:
3354                         LOCK_FDC(drive,1);
3355                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3356                         ret = UDRS->flags;
3357                         process_fd_request();
3358                         if(ret & FD_VERIFY)
3359                                 return -ENODEV;
3360                         if(!(ret & FD_DISK_WRITABLE))
3361                                 return -EROFS;
3362                         return 0;
3363                 case FDFMTTRK:
3364                         if (UDRS->fd_ref != 1)
3365                                 return -EBUSY;
3366                         return do_format(device, &inparam.f);
3367                 case FDFMTEND:
3368                 case FDFLUSH:
3369                         LOCK_FDC(drive,1);
3370                         return invalidate_drive(device);
3371 
3372                 case FDSETEMSGTRESH:
3373                         UDP->max_errors.reporting =
3374                                 (unsigned short) (param & 0x0f);
3375                         return 0;
3376                 OUT(FDGETMAXERRS, &UDP->max_errors);
3377                 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3378 
3379                 case FDGETDRVTYP:
3380                         outparam = drive_name(type,drive);
3381                         SUPBOUND(size,strlen(outparam)+1);
3382                         break;
3383 
3384                 IN(FDSETDRVPRM, UDP, dp);
3385                 OUT(FDGETDRVPRM, UDP);
3386 
3387                 case FDPOLLDRVSTAT:
3388                         LOCK_FDC(drive,1);
3389                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3390                         process_fd_request();
3391                         /* fall through */
3392                 OUT(FDGETDRVSTAT, UDRS);
3393 
3394                 case FDRESET:
3395                         return user_reset_fdc(drive, (int)param, 1);
3396 
3397                 OUT(FDGETFDCSTAT,UFDCS);
3398 
3399                 case FDWERRORCLR:
3400                         CLEARSTRUCT(UDRWE);
3401                         return 0;
3402                 OUT(FDWERRORGET,UDRWE);
3403 
3404                 case OLDFDRAWCMD:
3405                 case FDRAWCMD:
3406                         if (type)
3407                                 return -EINVAL;
3408                         LOCK_FDC(drive,1);
3409                         set_floppy(device);
3410                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3411                         process_fd_request();
3412                         return i;
3413 
3414                 case FDTWADDLE:
3415                         LOCK_FDC(drive,1);
3416                         twaddle();
3417                         process_fd_request();
3418                         return 0;
3419 
3420                 default:
3421                         return -EINVAL;
3422         }
3423 
3424         if (_IOC_DIR(cmd) & _IOC_READ)
3425                 return fd_copyout((void *)param, outparam, size);
3426         else
3427                 return 0;
3428 #undef IOCTL_ALLOWED
3429 #undef OUT
3430 #undef IN
3431 }
3432 
3433 static void config_types(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3434 {
3435         int first=1;
3436         int drive;
3437 
3438         /* read drive info out of physical cmos */
3439         drive=0;
3440         if (!UDP->cmos)
3441                 UDP->cmos= FLOPPY0_TYPE;
3442         drive=1;
3443         if (!UDP->cmos && FLOPPY1_TYPE)
3444                 UDP->cmos = FLOPPY1_TYPE;
3445 
3446         /* XXX */
3447         /* additional physical CMOS drive detection should go here */
3448 
3449         for (drive=0; drive < N_DRIVE; drive++){
3450                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3451                         memcpy((char *) UDP,
3452                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3453                                sizeof(struct floppy_drive_params));
3454                 if (UDP->cmos){
3455                         if (first)
3456                                 printk(KERN_INFO "Floppy drive(s): ");
3457                         else
3458                                 printk(", ");
3459                         first=0;
3460                         if (UDP->cmos > 0){
3461                                 allowed_drive_mask |= 1 << drive;
3462                                 printk("fd%d is %s", drive,
3463                                        default_drive_params[(int)UDP->cmos].name);
3464                         } else
3465                                 printk("fd%d is unknown type %d",drive,
3466                                        UDP->cmos);
3467                 }
3468         }
3469         if (!first)
3470                 printk("\n");
3471 }
3472 
3473 static int floppy_read(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3474                        char * buf, int count)
3475 {
3476         int drive = DRIVE(inode->i_rdev);
3477 
3478         check_disk_change(inode->i_rdev);
3479         if (UTESTF(FD_DISK_CHANGED))
3480                 return -ENXIO;
3481         return block_read(inode, filp, buf, count);
3482 }
3483 
3484 static int floppy_write(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3485                         const char * buf, int count)
3486 {
3487         int block;
3488         int ret;
3489         int drive = DRIVE(inode->i_rdev);
3490 
3491         if (!UDRS->maxblock)
3492                 UDRS->maxblock=1;/* make change detectable */
3493         check_disk_change(inode->i_rdev);
3494         if (UTESTF(FD_DISK_CHANGED))
3495                 return -ENXIO;
3496         if (!UTESTF(FD_DISK_WRITABLE))
3497                 return -EROFS;
3498         block = (filp->f_pos + count) >> 9;
3499         INFBOUND(UDRS->maxblock, block);
3500         ret= block_write(inode, filp, buf, count);
3501         return ret;
3502 }
3503 
3504 static void floppy_release(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3505 {
3506         int drive;
3507 
3508         drive = DRIVE(inode->i_rdev);
3509 
3510         if (!filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3511                 /* if the file is mounted OR (writable now AND writable at
3512                  * open time) Linus: Does this cover all cases? */
3513                 block_fsync(inode,filp);
3514 
3515         if (UDRS->fd_ref < 0)
3516                 UDRS->fd_ref=0;
3517         else if (!UDRS->fd_ref--) {
3518                 DPRINT("floppy_release with fd_ref == 0");
3519                 UDRS->fd_ref = 0;
3520         }
3521         floppy_release_irq_and_dma();
3522 }
3523 
3524 /*
3525  * floppy_open check for aliasing (/dev/fd0 can be the same as
3526  * /dev/PS0 etc), and disallows simultaneous access to the same
3527  * drive with different device numbers.
3528  */
3529 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3530 
3531 static int floppy_open(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3532 {
3533         int drive;
3534         int old_dev;
3535         int try;
3536         char *tmp;
3537 
3538         if (!filp) {
3539                 DPRINT("Weird, open called with filp=0\n");
3540                 return -EIO;
3541         }
3542 
3543         drive = DRIVE(inode->i_rdev);
3544         if (drive >= N_DRIVE ||
3545             !(allowed_drive_mask & (1 << drive)) ||
3546             fdc_state[FDC(drive)].version == FDC_NONE)
3547                 return -ENXIO;
3548 
3549         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3550                 return -ENXIO;
3551         old_dev = UDRS->fd_device;
3552         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3553                 return -EBUSY;
3554 
3555         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3556                 USETF(FD_DISK_CHANGED);
3557                 USETF(FD_VERIFY);
3558         }
3559 
3560         if (UDRS->fd_ref == -1 ||
3561            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3562                 return -EBUSY;
3563 
3564         if (floppy_grab_irq_and_dma())
3565                 return -EBUSY;
3566 
3567         if (filp->f_flags & O_EXCL)
3568                 UDRS->fd_ref = -1;
3569         else
3570                 UDRS->fd_ref++;
3571 
3572         if (!floppy_track_buffer){
3573                 /* if opening an ED drive, reserve a big buffer,
3574                  * else reserve a small one */
3575                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3576                         try = 64; /* Only 48 actually useful */
3577                 else
3578                         try = 32; /* Only 24 actually useful */
3579 
3580                 tmp=(char *)dma_mem_alloc(1024 * try);
3581                 if (!tmp) {
3582                         try >>= 1; /* buffer only one side */
3583                         INFBOUND(try, 16);
3584                         tmp= (char *)dma_mem_alloc(1024*try);
3585                 }
3586                 if (!tmp) {
3587                         DPRINT("Unable to allocate DMA memory\n");
3588                         RETERR(ENXIO);
3589                 }
3590                 if (floppy_track_buffer){
3591                         free_pages((unsigned long)tmp,__get_order(try*1024));
3592                 }else {
3593                         buffer_min = buffer_max = -1;
3594                         floppy_track_buffer = tmp;
3595                         max_buffer_sectors = try;
3596                 }
3597         }
3598 
3599         UDRS->fd_device = MINOR(inode->i_rdev);
3600         if (old_dev != -1 && old_dev != MINOR(inode->i_rdev)) {
3601                 if (buffer_drive == drive)
3602                         buffer_track = -1;
3603                 invalidate_buffers(MKDEV(FLOPPY_MAJOR,old_dev));
3604         }
3605 
3606         /* Allow ioctls if we have write-permissions even if read-only open */
3607         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3608                 filp->f_mode |= IOCTL_MODE_BIT;
3609         if (filp->f_mode & 2)
3610                 filp->f_mode |= OPEN_WRITE_BIT;
3611 
3612         if (UFDCS->rawcmd == 1)
3613                 UFDCS->rawcmd = 2;
3614 
3615         if (filp->f_flags & O_NDELAY)
3616                 return 0;
3617         if (filp->f_mode & 3) {
3618                 UDRS->last_checked = 0;
3619                 check_disk_change(inode->i_rdev);
3620                 if (UTESTF(FD_DISK_CHANGED))
3621                         RETERR(ENXIO);
3622         }
3623         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3624                 RETERR(EROFS);
3625         return 0;
3626 #undef RETERR
3627 }
3628 
3629 /*
3630  * Check if the disk has been changed or if a change has been faked.
3631  */
3632 static int check_floppy_change(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3633 {
3634         int drive = DRIVE(dev);
3635 
3636         if (MAJOR(dev) != MAJOR_NR) {
3637                 DPRINT("check_floppy_change: not a floppy\n");
3638                 return 0;
3639         }
3640 
3641         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3642                 return 1;
3643 
3644         if (UDRS->last_checked + UDP->checkfreq < jiffies){
3645                 lock_fdc(drive,0);
3646                 poll_drive(0,0);
3647                 process_fd_request();
3648         }
3649 
3650         if (UTESTF(FD_DISK_CHANGED) ||
3651            UTESTF(FD_VERIFY) ||
3652            test_bit(drive, &fake_change) ||
3653            (!TYPE(dev) && !current_type[drive]))
3654                 return 1;
3655         return 0;
3656 }
3657 
3658 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3659  * the bootblock (block 0). "Autodetection" is also needed to check whether
3660  * there is a disk in the drive at all... Thus we also do it for fixed
3661  * geometry formats */
3662 static int floppy_revalidate(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3663 {
3664 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3665         struct buffer_head * bh;
3666         int drive=DRIVE(dev);
3667         int cf;
3668 
3669         if (UTESTF(FD_DISK_CHANGED) ||
3670            UTESTF(FD_VERIFY) ||
3671            test_bit(drive, &fake_change) ||
3672            NO_GEOM){
3673                 lock_fdc(drive,0);
3674                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3675                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)){
3676                         process_fd_request(); /*already done by another thread*/
3677                         return 0;
3678                 }
3679                 UDRS->maxblock = 0;
3680                 UDRS->maxtrack = 0;
3681                 if (buffer_drive == drive)
3682                         buffer_track = -1;
3683                 clear_bit(drive, &fake_change);
3684                 UCLEARF(FD_DISK_CHANGED);
3685                 if (cf)
3686                         UDRS->generation++;
3687                 if (NO_GEOM){
3688                         /* auto-sensing */
3689                         int size = floppy_blocksizes[MINOR(dev)];
3690                         if (!size)
3691                                 size = 1024;
3692                         if (!(bh = getblk(dev,0,size))){
3693                                 process_fd_request();
3694                                 return 1;
3695                         }
3696                         if (bh && !buffer_uptodate(bh))
3697                                 ll_rw_block(READ, 1, &bh);
3698                         process_fd_request();
3699                         wait_on_buffer(bh);
3700                         brelse(bh);
3701                         return 0;
3702                 }
3703                 if (cf)
3704                         poll_drive(0, FD_RAW_NEED_DISK);
3705                 process_fd_request();
3706         }
3707         return 0;
3708 }
3709 
3710 static struct file_operations floppy_fops = {
3711         NULL,                   /* lseek - default */
3712         floppy_read,            /* read - general block-dev read */
3713         floppy_write,           /* write - general block-dev write */
3714         NULL,                   /* readdir - bad */
3715         NULL,                   /* select */
3716         fd_ioctl,               /* ioctl */
3717         NULL,                   /* mmap */
3718         floppy_open,            /* open */
3719         floppy_release,         /* release */
3720         block_fsync,            /* fsync */
3721         NULL,                   /* fasync */
3722         check_floppy_change,    /* media_change */
3723         floppy_revalidate,      /* revalidate */
3724 };
3725 
3726 /*
3727  * Floppy Driver initialisation
3728  * =============================
3729  */
3730 
3731 /* Determine the floppy disk controller type */
3732 /* This routine was written by David C. Niemi */
3733 static char get_fdc_version(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3734 {
3735         int r;
3736 
3737         FDCS->has_fifo = 0;
3738         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3739         if (FDCS->reset)
3740                 return FDC_NONE;
3741         if ((r = result()) <= 0x00)
3742                 return FDC_NONE;        /* No FDC present ??? */
3743         if ((r==1) && (reply_buffer[0] == 0x80)){
3744                 printk(KERN_INFO "FDC %d is an 8272A\n",fdc);
3745                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3746         }
3747         if (r != 10) {
3748                 printk("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3749                        fdc, r);
3750                 return FDC_UNKNOWN;
3751         }
3752         output_byte(FD_VERSION);
3753         r = result();
3754         if ((r == 1) && (reply_buffer[0] == 0x80)){
3755                 printk(KERN_INFO "FDC %d is an 82072\n",fdc);
3756                 return FDC_82072;               /* 82072 doesn't know VERSION */
3757         }
3758         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3759                 printk("FDC %d init: VERSION: unexpected return of %d bytes.\n",
3760                        fdc, r);
3761                 return FDC_UNKNOWN;
3762         }
3763         FDCS->has_fifo = fdc_configure();
3764         output_byte(FD_PERPENDICULAR);
3765         if(need_more_output() == MORE_OUTPUT) {
3766                 output_byte(0);
3767         } else {
3768                 printk(KERN_INFO "FDC %d is an 82072A\n", fdc);
3769                 return FDC_82072A;      /* 82072A as found on Sparcs. */
3770         }
3771 
3772         output_byte(FD_UNLOCK);
3773         r = result();
3774         if ((r == 1) && (reply_buffer[0] == 0x80)){
3775                 printk(KERN_INFO "FDC %d is a pre-1991 82077\n", fdc);
3776                 return FDC_82077_ORIG;  /* Pre-1991 82077, doesn't know 
3777                                          * LOCK/UNLOCK */
3778         }
3779         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3780                 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3781                        fdc, r);
3782                 return FDC_UNKNOWN;
3783         }
3784         output_byte(FD_PARTID);
3785         r = result();
3786         if (r != 1) {
3787                 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3788                        fdc, r);
3789                 return FDC_UNKNOWN;
3790         }
3791         if (reply_buffer[0] == 0x80) {
3792                 printk(KERN_INFO "FDC %d is a post-1991 82077\n",fdc);
3793                 return FDC_82077;       /* Revised 82077AA passes all the tests */
3794         }
3795         switch (reply_buffer[0] >> 5) {
3796                 case 0x0:
3797                         output_byte(FD_SAVE);
3798                         r = result();
3799                         if (r != 16) {
3800                                 printk("FDC %d init: SAVE: unexpected return of %d bytes.\n", fdc, r);
3801                                 return FDC_UNKNOWN;
3802                         }
3803                         if (!(reply_buffer[0] & 0x40)) {
3804                                 printk(KERN_INFO "FDC %d is a 3Volt 82078SL.\n",fdc);
3805                                 return FDC_82078;
3806                         }
3807                         /* Either a 82078-1 or a 82078SL running at 5Volt */
3808                         printk(KERN_INFO "FDC %d is an 82078-1.\n",fdc);
3809                         return FDC_82078_1;
3810                 case 0x1:
3811                         printk(KERN_INFO "FDC %d is a 44pin 82078\n",fdc);
3812                         return FDC_82078;
3813                 case 0x2:
3814                         printk(KERN_INFO "FDC %d is a S82078B\n", fdc);
3815                         return FDC_S82078B;
3816                 case 0x3:
3817                         printk(KERN_INFO "FDC %d is a National Semiconductor PC87306\n", fdc);
3818                         return FDC_87306;
3819                 default:
3820                         printk(KERN_INFO "FDC %d init: 82077 variant with PARTID=%d.\n",
3821                                fdc, reply_buffer[0] >> 5);
3822                         return FDC_82077_UNKN;
3823         }
3824 } /* get_fdc_version */
3825 
3826 /* lilo configuration */
3827 
3828 /* we make the invert_dcl function global. One day, somebody might
3829  * want to centralize all thinkpad related options into one lilo option,
3830  * there are just so many thinkpad related quirks! */
3831 void floppy_invert_dcl(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3832 {
3833         int i;
3834 
3835         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3836                 if (param)
3837                         default_drive_params[i].params.flags |= 0x80;
3838                 else
3839                         default_drive_params[i].params.flags &= ~0x80;
3840         }
3841         DPRINT("Configuring drives for inverted dcl\n");
3842 }
3843 
3844 static void daring(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3845 {
3846         int i;
3847 
3848         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3849                 if (param){
3850                         default_drive_params[i].params.select_delay = 0;
3851                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3852                 } else {
3853                         default_drive_params[i].params.select_delay = 2*HZ/100;
3854                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3855                 }
3856         }
3857         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3858 }
3859 
3860 static void set_cmos(int *ints, int dummy)
     /* [previous][next][first][last][top][bottom][index][help] */
3861 {
3862         int current_drive=0;
3863 
3864         if (ints[0] != 2){
3865                 DPRINT("wrong number of parameter for cmos\n");
3866                 return;
3867         }
3868         current_drive = ints[1];
3869         if (current_drive < 0 || current_drive >= 8){
3870                 DPRINT("bad drive for set_cmos\n");
3871                 return;
3872         }
3873         if (current_drive >= 4 && !FDC2)
3874                 FDC2 = 0x370;
3875         if (ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3876                 DPRINT1("bad cmos code %d\n", ints[2]);
3877                 return;
3878         }
3879         DP->cmos = ints[2];
3880         DPRINT1("setting cmos code to %d\n", ints[2]);
3881 }
3882 
3883 static struct param_table {
3884         const char *name;
3885         void (*fn)(int *ints, int param);
3886         int *var;
3887         int def_param;
3888 } config_params[]={
3889         { "allowed_drive_mask", 0, &allowed_drive_mask, 0xff },
3890         { "all_drives", 0, &allowed_drive_mask, 0xff },
3891         { "asus_pci", 0, &allowed_drive_mask, 0x33 },
3892 
3893         { "daring", daring, 0, 1},
3894 
3895         { "two_fdc",  0, &FDC2, 0x370 },
3896         { "one_fdc", 0, &FDC2, 0 },
3897 
3898         { "thinkpad", floppy_invert_dcl, 0, 1 },
3899 
3900         { "nodma", 0, &use_virtual_dma, 1 },
3901         { "omnibook", 0, &use_virtual_dma, 1 },
3902         { "dma", 0, &use_virtual_dma, 0 },
3903 
3904         { "fifo", 0, &fifo, 0xa },
3905 
3906         { "cmos", set_cmos, 0, 0 },
3907 
3908         { "unexpected_interrupts", 0, &print_unex, 1 },
3909         { "no_unexpected_interrupts", 0, &print_unex, 0 },
3910         { "L40SX", 0, &print_unex, 0 } };
3911 
3912 #define FLOPPY_SETUP
3913 void floppy_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
3914 {
3915         int i;
3916         int param;
3917         if (str)
3918                 for (i=0; i< ARRAY_SIZE(config_params); i++){
3919                         if (strcmp(str,config_params[i].name) == 0){
3920                                 if (ints[0])
3921                                         param = ints[1];
3922                                 else
3923                                         param = config_params[i].def_param;
3924                                 if(config_params[i].fn)
3925                                         config_params[i].fn(ints,param);
3926                                 if(config_params[i].var) {
3927                                         DPRINT2("%s=%d\n", str, param);
3928                                         *config_params[i].var = param;
3929                                 }
3930                                 return;
3931                         }
3932                 }
3933         if (str) {
3934                 DPRINT1("unknown floppy option [%s]\n", str);
3935                 
3936                 DPRINT("allowed options are:");
3937                 for (i=0; i< ARRAY_SIZE(config_params); i++)
3938                         printk(" %s",config_params[i].name);
3939                 printk("\n");
3940         } else
3941                 DPRINT("botched floppy option\n");
3942         DPRINT("Read linux/drivers/block/README.fd\n");
3943 }
3944 
3945 int floppy_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3946 {
3947         int i,unit,drive;
3948         int have_no_fdc= -EIO;
3949 
3950         raw_cmd = 0;
3951 
3952         sti();
3953 
3954         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3955                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3956                 return -EBUSY;
3957         }
3958 
3959         for (i=0; i<256; i++)
3960                 if (ITYPE(i))
3961                         floppy_sizes[i] = floppy_type[ITYPE(i)].size >> 1;
3962                 else
3963                         floppy_sizes[i] = MAX_DISK_SIZE;
3964 
3965         blk_size[MAJOR_NR] = floppy_sizes;
3966         blksize_size[MAJOR_NR] = floppy_blocksizes;
3967         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3968         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3969 #ifdef __sparc__
3970         fdc_cfg = (0x40 | 0x10); /* ImplSeek+Polling+FIFO */
3971 #endif
3972         config_types();
3973 
3974         for (i = 0; i < N_FDC; i++) {
3975                 fdc = i;
3976                 CLEARSTRUCT(FDCS);
3977                 FDCS->dtr = -1;
3978                 FDCS->dor = 0x4;
3979         }
3980 
3981         fdc_state[0].address = FDC1;
3982 #if N_FDC > 1
3983         fdc_state[1].address = FDC2;
3984 #endif
3985 
3986         if (floppy_grab_irq_and_dma()){
3987                 unregister_blkdev(MAJOR_NR,"fd");
3988                 return -EBUSY;
3989         }
3990 
3991         /* initialise drive state */
3992         for (drive = 0; drive < N_DRIVE; drive++) {
3993                 CLEARSTRUCT(UDRS);
3994                 CLEARSTRUCT(UDRWE);
3995                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3996                 UDRS->fd_device = -1;
3997                 floppy_track_buffer = NULL;
3998                 max_buffer_sectors = 0;
3999         }
4000 
4001         for (i = 0; i < N_FDC; i++) {
4002                 fdc = i;
4003                 FDCS->driver_version = FD_DRIVER_VERSION;
4004                 for (unit=0; unit<4; unit++)
4005                         FDCS->track[unit] = 0;
4006                 if (FDCS->address == -1)
4007                         continue;
4008                 FDCS->rawcmd = 2;
4009                 if (user_reset_fdc(-1,FD_RESET_ALWAYS,0)){
4010                         FDCS->address = -1;
4011                         continue;
4012                 }
4013                 /* Try to determine the floppy controller type */
4014                 FDCS->version = get_fdc_version();
4015                 if (FDCS->version == FDC_NONE){
4016                         FDCS->address = -1;
4017                         continue;
4018                 }
4019 
4020                 request_region(FDCS->address, 6, "floppy");
4021                 request_region(FDCS->address+7, 1, "floppy DIR");
4022                 /* address + 6 is reserved, and may be taken by IDE.
4023                  * Unfortunately, Adaptec doesn't know this :-(, */
4024 
4025                 have_no_fdc = 0;
4026                 /* Not all FDCs seem to be able to handle the version command
4027                  * properly, so force a reset for the standard FDC clones,
4028                  * to avoid interrupt garbage.
4029                  */
4030                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
4031         }
4032         fdc=0;
4033         del_timer(&fd_timeout);
4034         current_drive = 0;
4035         floppy_release_irq_and_dma();
4036         initialising=0;
4037         if (have_no_fdc) {
4038                 DPRINT("no floppy controllers found\n");
4039                 unregister_blkdev(MAJOR_NR,"fd");
4040         } else
4041                 virtual_dma_init();
4042         return have_no_fdc;
4043 }
4044 
4045 static int floppy_grab_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4046 {
4047         int i;
4048         cli();
4049         if (usage_count++){
4050                 sti();
4051                 return 0;
4052         }
4053         sti();
4054         MOD_INC_USE_COUNT;
4055         for (i=0; i< N_FDC; i++){
4056                 if (FDCS->address != -1){
4057                         fdc = i;
4058                         reset_fdc_info(1);
4059                         fd_outb(FDCS->dor, FD_DOR);
4060                 }
4061         }
4062         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
4063 
4064         if (fd_request_irq()) {
4065                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
4066                         FLOPPY_IRQ);
4067                 return -1;
4068         }
4069         if (fd_request_dma()) {
4070                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
4071                         FLOPPY_DMA);
4072                 fd_free_irq();
4073                 return -1;
4074         }
4075         for (fdc = 0; fdc < N_FDC; fdc++)
4076                 if (FDCS->address != -1)
4077                         fd_outb(FDCS->dor, FD_DOR);
4078         fdc = 0;
4079         fd_enable_irq();
4080         return 0;
4081 }
4082 
4083 static void floppy_release_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4084 {
4085 #ifdef FLOPPY_SANITY_CHECK
4086         int drive;
4087 #endif
4088         long tmpsize;
4089         void *tmpaddr;
4090 
4091         cli();
4092         if (--usage_count){
4093                 sti();
4094                 return;
4095         }
4096         sti();
4097         MOD_DEC_USE_COUNT;
4098         fd_disable_dma();
4099         fd_free_dma();
4100         fd_disable_irq();
4101         fd_free_irq();
4102 
4103         set_dor(0, ~0, 8);
4104 #if N_FDC > 1
4105         set_dor(1, ~8, 0);
4106 #endif
4107         floppy_enable_hlt();
4108 
4109         if (floppy_track_buffer && max_buffer_sectors) {
4110                 tmpsize = max_buffer_sectors*1024;
4111                 tmpaddr = (void *)floppy_track_buffer;
4112                 floppy_track_buffer = 0;
4113                 max_buffer_sectors = 0;
4114                 buffer_min = buffer_max = -1;
4115                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
4116         }
4117 
4118 #ifdef FLOPPY_SANITY_CHECK
4119         for (drive=0; drive < N_FDC * 4; drive++)
4120                 if (motor_off_timer[drive].next)
4121                         printk("motor off timer %d still active\n", drive);
4122 
4123         if (fd_timeout.next)
4124                 printk("floppy timer still active:%s\n", timeout_message);
4125         if (fd_timer.next)
4126                 printk("auxiliary floppy timer still active\n");
4127         if (floppy_tq.sync)
4128                 printk("task queue still active\n");
4129 #endif
4130 }
4131 
4132 
4133 #ifdef MODULE
4134 
4135 extern char *get_options(char *str, int *ints);
4136 
4137 char *floppy=NULL;
4138 
4139 static void parse_floppy_cfg_string(char *cfg)
     /* [previous][next][first][last][top][bottom][index][help] */
4140 {
4141         char *ptr;
4142         int ints[11];
4143 
4144         while(*cfg) {
4145                 for(ptr = cfg;*cfg && *cfg != ' ' && *cfg != '\t'; cfg++);
4146                 if(*cfg) {
4147                         *cfg = '\0';
4148                         cfg++;
4149                 }
4150                 if(*ptr)
4151                         floppy_setup(get_options(ptr,ints),ints);
4152         }
4153 }
4154 
4155 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /* [previous][next][first][last][top][bottom][index][help] */
4156 {
4157         unsigned long i;
4158         char c;
4159         int j;
4160         int match;
4161         char buffer[100];
4162         int ints[11];
4163         int length = strlen(pattern)+1;
4164 
4165         match=0;
4166         j=1;
4167 
4168         for (i=current->mm->env_start; i< current->mm->env_end; i ++){
4169                 c= get_fs_byte(i);
4170                 if (match){
4171                         if (j==99)
4172                                 c='\0';
4173                         buffer[j] = c;
4174                         if (!c || c == ' ' || c == '\t'){
4175                                 if (j){
4176                                         buffer[j] = '\0';
4177                                         setup(get_options(buffer,ints),ints);
4178                                 }
4179                                 j=0;
4180                         } else
4181                                 j++;
4182                         if (!c)
4183                                 break;
4184                         continue;
4185                 }
4186                 if ((!j && !c) || (j && c == pattern[j-1]))
4187                         j++;
4188                 else
4189                         j=0;
4190                 if (j==length){
4191                         match=1;
4192                         j=0;
4193                 }
4194         }
4195 }
4196 
4197 
4198 #ifdef __cplusplus
4199 extern "C" {
4200 #endif
4201 int init_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4202 {
4203         printk(KERN_INFO "inserting floppy driver for %s\n", kernel_version);
4204                 
4205         if(floppy)
4206                 parse_floppy_cfg_string(floppy);
4207         else
4208                 mod_setup("floppy=", floppy_setup);
4209                 
4210         return floppy_init();
4211 }
4212 
4213 void cleanup_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
4214 {
4215         int fdc, dummy;
4216                 
4217         for (fdc=0; fdc<2; fdc++)
4218                 if (FDCS->address != -1){
4219                         release_region(FDCS->address, 6);
4220                         release_region(FDCS->address+7, 1);
4221         }
4222                 
4223         unregister_blkdev(MAJOR_NR, "fd");
4224 
4225         blk_dev[MAJOR_NR].request_fn = 0;
4226         /* eject disk, if any */
4227         dummy = fd_eject(0);
4228 }
4229 
4230 #ifdef __cplusplus
4231 }
4232 #endif
4233 
4234 #endif
/* [previous][next][first][last][top][bottom][index][help] */