drivers/block/floppy.c

/* */
This source file includes following definitions.
set_debugt
debugt
set_dor
twaddle
reset_fdc_info
set_fdc
lock_fdc
unlock_fdc
motor_off_callback
floppy_off
scandrives
fd_watchdog
main_command_interrupt
wait_for_completion
setup_DMA
output_byte
result
perpendicular_mode
fdc_specify
fdc_dtr
tell_sector
interpret_errors
setup_rw_floppy
seek_interrupt
seek_floppy
recal_interrupt
unexpected_floppy_interrupt
floppy_interrupt
recalibrate_floppy
reset_interrupt
reset_fdc
floppy_shutdown
start_motor
floppy_ready
floppy_on
empty
do_wakeup
wait_til_done
generic_done
generic_success
generic_failure
success_and_wakeup
failure_and_wakeup
next_valid_format
bad_flp_intr
set_floppy
format_interrupt
setup_format_params
redo_format
do_format
request_done
rw_interrupt
buffer_chain_size
transfer_size
copy_buffer
make_raw_rw_request
redo_fd_request
do_fd_request
reset_intr
user_reset_fdc
fd_copyout
poll_drive
drive_name
raw_cmd_ioctl
invalidate_drive
fd_ioctl
set_base_type
config_types
maybe_check_change
floppy_is_wp
floppy_release
floppy_open
ack_change
check_floppy_change
floppy_revalidate
get_fdc_version
detect_interrupt
floppy_init
floppy_grab_irq_and_dma
floppy_release_irq_and_dma
   1 /*
   2  *  linux/kernel/floppy.c
   3  *
   4  *  Copyright (C) 1991, 1992  Linus Torvalds
   5  *  Copyright (C) 1993, 1994  Alain Knaff
   6  */
   7 
   8 /* Configuration */
   9 /* The following does some extra sanity checks */
  10 #define SANITY
  11 
  12 /* Undefine the following if you have to floppy disk controllers:
  13  * This works at least for me; if you get two controllers working, with
  14  * drives attached to both, please mail me: Alain.Knaff@imag.fr */
  15 /* #define HAVE_2_CONTROLLERS */
  16 
  17 /* Undefine the following if you have problems accessing ED disks, but don't
  18  * have problems accessing them with the stock driver. If that is the case,
  19  * please mail me: Alain.Knaff@imag.fr */
  20 /* #define FDC_FIFO_BUG */
  21 
  22 /* End of configuration */
  23 
  24 /*
  25  * 02.12.91 - Changed to static variables to indicate need for reset
  26  * and recalibrate. This makes some things easier (output_byte reset
  27  * checking etc), and means less interrupt jumping in case of errors,
  28  * so the code is hopefully easier to understand.
  29  */
  30 
  31 /*
  32  * This file is certainly a mess. I've tried my best to get it working,
  33  * but I don't like programming floppies, and I have only one anyway.
  34  * Urgel. I should check for more errors, and do more graceful error
  35  * recovery. Seems there are problems with several drives. I've tried to
  36  * correct them. No promises.
  37  */
  38 
  39 /*
  40  * As with hd.c, all routines within this file can (and will) be called
  41  * by interrupts, so extreme caution is needed. A hardware interrupt
  42  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  43  * call "floppy-on" directly, but have to set a special timer interrupt
  44  * etc.
  45  */
  46 
  47 /*
  48  * 28.02.92 - made track-buffering routines, based on the routines written
  49  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  50  */
  51 
  52 /*
  53  * Automatic floppy-detection and formatting written by Werner Almesberger
  54  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  55  * the floppy-change signal detection.
  56  */
  57 
  58 /*
  59  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  60  * FDC data overrun bug, added some preliminary stuff for vertical
  61  * recording support.
  62  *
  63  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  64  *
  65  * TODO: Errors are still not counted properly.
  66  */
  67 
  68 /* 1992/9/20
  69  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  70  * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
  71  * Christoph H. Hochst\"atter.
  72  * I have fixed the shift values to the ones I always use. Maybe a new
  73  * ioctl() should be created to be able to modify them.
  74  * There is a bug in the driver that makes it impossible to format a
  75  * floppy as the first thing after bootup.
  76  */
  77 
  78 /*
  79  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  80  * this helped the floppy driver as well. Much cleaner, and still seems to
  81  * work.
  82  */
  83 
  84 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  85  * minor modifications to allow 2.88 floppies to be run.
  86  */
  87 
  88 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
  89  * disk types.
  90  */
  91 
  92 
  93 #define REALLY_SLOW_IO
  94 #define FLOPPY_IRQ 6
  95 #define FLOPPY_DMA 2
  96 
  97 #define DEBUGT 2
  98 
  99 #include <linux/sched.h>
 100 #include <linux/fs.h>
 101 #include <linux/kernel.h>
 102 #include <linux/timer.h>
 103 #define FDPATCHES
 104 #include <linux/fdreg.h>
 105 #include <linux/fd.h>
 106 #include <linux/errno.h>
 107 #include <linux/malloc.h>
 108 #include <linux/string.h>
 109 #include <linux/fcntl.h>
 110 #include <linux/delay.h>
 111 
 112 #include <asm/dma.h>
 113 #include <asm/irq.h>
 114 #include <asm/system.h>
 115 #include <asm/io.h>
 116 #include <asm/segment.h>
 117 
 118 #define MAJOR_NR FLOPPY_MAJOR
 119 #include "blk.h"
 120 
 121 static unsigned int changed_floppies = 0, fake_change = 0;
 122 static int initialising=1;
 123 
 124 
 125 #ifdef HAVE_2_CONTROLLERS
 126 #define N_FDC 2
 127 #define N_DRIVE 8
 128 #else
 129 #define N_FDC 1
 130 #define N_DRIVE 4
 131 #endif
 132 
 133 #define TYPE(x) ( ((x)>>2) & 0x1f )
 134 #define DRIVE(x) ( ((x)&0x03) | (((x)&0x80 ) >> 5))
 135 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 136 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 137 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 138                                 /* reverse mapping from unit and fdc to drive */
 139 #define DP (&drive_params[current_drive])
 140 #define DRS (&drive_state[current_drive])
 141 #define FDCS (&fdc_state[fdc])
 142 
 143 #define UDP (&drive_params[drive])
 144 #define UDRS (&drive_state[drive])
 145 #define UFDCS (&fdc_state[FDC(drive)])
 146 
 147 /* read/write */
 148 #define COMMAND raw_cmd.cmd[0]
 149 #define DR_SELECT raw_cmd.cmd[1]
 150 #define TRACK raw_cmd.cmd[2]
 151 #define HEAD raw_cmd.cmd[3]
 152 #define SECTOR raw_cmd.cmd[4]
 153 #define SIZECODE raw_cmd.cmd[5]
 154 #define SECT_PER_TRACK raw_cmd.cmd[6]
 155 #define GAP raw_cmd.cmd[7]
 156 #define SIZECODE2 raw_cmd.cmd[8]
 157 #define NR_RW 9
 158 
 159 /* format */
 160 #define F_SIZECODE raw_cmd.cmd[2]
 161 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 162 #define F_GAP raw_cmd.cmd[4]
 163 #define F_FILL raw_cmd.cmd[5]
 164 #define NR_F 6
 165 
 166 /*
 167  * Maximum disk size (in kilobytes). This default is used whenever the
 168  * current disk size is unknown.
 169  */
 170 #define MAX_DISK_SIZE 3984
 171 
 172 
 173 
 174 /*
 175  * The DMA channel used by the floppy controller cannot access data at
 176  * addresses >= 16MB
 177  *
 178  * Went back to the 1MB limit, as some people had problems with the floppy
 179  * driver otherwise. It doesn't matter much for performance anyway, as most
 180  * floppy accesses go through the track buffer.
 181  */
 182 #define LAST_DMA_ADDR   (0x1000000)
 183 #define K_64 (0x10000) /* 64 k */
 184 
 185 /*
 186  * globals used by 'result()'
 187  */
 188 #define MAX_REPLIES 10
 189 static unsigned char reply_buffer[MAX_REPLIES];
 190 static int inr; /* size of reply buffer, when called from interrupt */
 191 #define ST0 (reply_buffer[0])
 192 #define ST1 (reply_buffer[1])
 193 #define ST2 (reply_buffer[2])
 194 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 195 #define R_TRACK (reply_buffer[3])
 196 #define R_HEAD (reply_buffer[4])
 197 #define R_SECTOR (reply_buffer[5])
 198 #define R_SIZECODE (reply_buffer[6])
 199 
 200 /*
 201  * this struct defines the different floppy drive types.
 202  */
 203 static struct {
 204         struct floppy_drive_params params;
 205         char *name; /* name printed while booting */
 206 } default_drive_params[]= {
 207 /* NOTE: the time values in jiffies should be in msec!
 208  CMOS drive type
 209   |     Maximum data rate supported by drive type
 210   |     |   Head load time, msec
 211   |     |   |   Head unload time, msec (not used)
 212   |     |   |   |     Step rate interval, usec
 213   |     |   |   |     |    Time needed for spinup time (jiffies)
 214   |     |   |   |     |    |    Timeout for spinning down (jiffies)
 215   |     |   |   |     |    |    |   Spindown offset (where disk stops)
 216   |     |   |   |     |    |    |   |  Select delay
 217   |     |   |   |     |    |    |   |  |  RPS
 218   |     |   |   |     |    |    |   |  |  |    Max number of tracks
 219   |     |   |   |     |    |    |   |  |  |    |     Interrupt timeout
 220   |     |   |   |     |    |    |   |  |  |    |     |   Max nonintlv. sectors
 221   |     |   |   |     |    |    |   |  |  |    |     |   | -Max Errors- flags */
 222 {{0,  500, 16, 16, 8000, 100, 300,  0, 2, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 223       0, { 7, 4, 8, 2, 1, 5, 3,10}, 150, 0 }, "unknown" },
 224 
 225 {{1,  300, 16, 16, 8000, 100, 300,  0, 2, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 226       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 150, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 227 
 228 {{2,  500, 16, 16, 6000,  40, 300, 14, 2, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 229       0, { 2, 5, 6,23,10,20,11, 0}, 150, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 230 
 231 {{3,  250, 16, 16, 3000, 100, 300,  0, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 232       0, { 4,22,21,30, 3, 0, 0, 0}, 150, 4 }, "720k" }, /*3 1/2 DD*/
 233 
 234 {{4,  500, 16, 16, 4000,  40, 300, 10, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 235       0, { 7, 4,25,22,31,21,29,11}, 150, 7 }, "1.44M" }, /*3 1/2 HD*/
 236 
 237 {{5, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 238       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 239 
 240 {{6, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 241       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M" } /*3 1/2 ED*/
 242 /*    |  ---autodetected formats--   |   |      |
 243       read_track                     |   |    Name printed when booting
 244                                      |  Native format
 245                                    Frequency of disk change checks */
 246 };
 247 
 248 static struct floppy_drive_params drive_params[N_DRIVE];
 249 static struct floppy_drive_struct volatile drive_state[N_DRIVE];
 250 static struct floppy_raw_cmd raw_cmd;
 251 
 252 /*
 253  * This struct defines the different floppy types.
 254  *
 255  * The 'stretch' tells if the tracks need to be doubled for some
 256  * types (ie 360kB diskette in 1.2MB drive etc). Others should
 257  * be self-explanatory.
 258  */
 259 static struct floppy_struct floppy_type[32] = {
 260         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 261         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 262         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 263         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 264         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 265         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 266         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 267         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 268         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 269         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 270 
 271         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 272         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x6C,"H1680" }, /* 11 1.68MB 3.5"   */
 273         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 274         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 275         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 276         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 277         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 278         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 279         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 280         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 281 
 282         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x6C,"d880"  }, /* 20 880KB 5.25"   */
 283         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x6C,"D1040" }, /* 21 1.04MB 3.5"   */
 284         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x6C,"D1120" }, /* 22 1.12MB 3.5"   */
 285         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x6C,"h1600" }, /* 23 1.6MB 5.25"   */
 286         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x6C,"H1760" }, /* 24 1.76MB 3.5"   */
 287         { 3840,24,2,80,0,0x1C,0x18,0xCF,0x6C,"H1920" }, /* 25 1.92MB 3.5"   */
 288         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x6C,"E3200" }, /* 26 3.20MB 3.5"   */
 289         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x6C,"E3520" }, /* 27 3.52MB 3.5"   */
 290         { 7680,48,2,80,0,0x25,0x63,0xCF,0x6C,"E3840" }, /* 28 3.84MB 3.5"   */
 291 
 292         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x6C,"H1840" }, /* 29 1.84MB 3.5"   */
 293         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 294         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x6C,"H1600" }, /* 31 1.6MB 3.5"    */
 295 };
 296 
 297 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 298 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 299 
 300 /* Auto-detection: Disk type used until the next media change occurs. */
 301 struct floppy_struct *current_type[N_DRIVE] = { NULL, NULL, NULL, NULL
 302 #ifdef HAVE_2_CONTROLLERS
 303                                           ,NULL, NULL, NULL, NULL
 304 #endif
 305                                         };
 306 
 307 /*
 308  * User-provided type information. current_type points to
 309  * the respective entry of this array.
 310  */
 311 struct floppy_struct user_params[N_DRIVE];
 312 
 313 static int floppy_sizes[256];
 314 
 315 /*
 316  * The driver is trying to determine the correct media format
 317  * while probing is set. rw_interrupt() clears it after a
 318  * successful access.
 319  */
 320 static int probing = 0;
 321 
 322 /* Synchronization of FDC access. */
 323 #define FD_COMMAND_DETECT -2
 324 #define FD_COMMAND_NONE -1
 325 #define FD_COMMAND_ERROR 2
 326 #define FD_COMMAND_OKAY 3
 327 
 328 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 329 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 330 
 331 /* Errors during formatting are counted here. */
 332 static int format_errors;
 333 
 334 /* Format request descriptor. */
 335 static struct format_descr format_req;
 336 
 337 /*
 338  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 339  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 340  * H is head unload time (1=16ms, 2=32ms, etc)
 341  */
 342 
 343 /*
 344  * Track buffer
 345  * Because these are written to by the DMA controller, they must
 346  * not contain a 64k byte boundary crossing, or data will be
 347  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 348  * Note that you must not change the sizes below without updating head.S.
 349  */
 350 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 351 
 352 int *errors;
 353 typedef void (*done_f)(int);
 354 struct cont_t {
 355 void (*interrupt)(void); /* this is called after the interrupt of the
 356                           * main command */
 357 void (*redo)(void); /* this is called to retry the operation */
 358 void (*error)(void); /* this is called to tally an error */
 359 done_f done; /* this is called to say if the operation has succeeded/failed */
 360 } *cont;
 361 
 362 static void floppy_ready(void);
 363 static void recalibrate_floppy(void);
 364 static void seek_floppy(void);
 365 static void floppy_shutdown(void);
 366 
 367 int floppy_grab_irq_and_dma(void);
 368 void floppy_release_irq_and_dma(void);
 369 
 370 /*
 371  * The "reset" variable should be tested whenever an interrupt is scheduled,
 372  * after the commands have been sent. This is to ensure that the driver doesn't
 373  * get wedged when the interrupt doesn't come because of a failed command.
 374  * reset doesn't need to be tested before sending commands, because
 375  * output_byte is automatically disabled when reset is set.
 376  */
 377 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 378 static void reset_fdc(void);
 379 
 380 /*
 381  * These are global variables, as that's the easiest way to give
 382  * information to interrupts. They are the data used for the current
 383  * request.
 384  */
 385 #define NO_TRACK -1
 386 #define NEED_1_RECAL -2
 387 #define NEED_2_RECAL -3
 388 
 389 /* buffer related variables */
 390 static int buffer_track = -1;
 391 static int buffer_drive = -1;
 392 static int buffer_min = -1;
 393 static int buffer_max = -1;
 394 
 395 #ifdef FDC_FIFO_BUG
 396 static int force=0;
 397 #endif
 398 
 399 /* fdc related variables, should end up in a struct */
 400 static struct floppy_fdc_state fdc_state[N_FDC];
 401 int fdc; /* current fdc */
 402 
 403 static struct floppy_struct * floppy = floppy_type;
 404 static unsigned char current_drive = 255;
 405 static long current_count_sectors = 0;
 406 static char *current_addr = 0;
 407 static unsigned char sector_t; /* sector in track */
 408 
 409 #ifdef DEBUGT
 410 long unsigned debugtimer;
 411 #endif
 412 
 413 /*
 414  * Debugging
 415  * =========
 416  */
 417 static inline void set_debugt(void)
     /*  */
 418 {
 419 #ifdef DEBUGT
 420         debugtimer = jiffies;
 421 #endif
 422 }
 423 
 424 static inline void debugt(char *message)
     /*  */
 425 {
 426 #ifdef DEBUGT
 427   if ( DP->flags & DEBUGT )
 428         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 429 #endif
 430 }
 431 
 432 /*
 433  * Bottom half floppy driver.
 434  * ==========================
 435  *
 436  * This part of the file contains the code talking directly to the hardware,
 437  * and also the main service loop (seek-configure-spinup-command)
 438  */
 439 static int set_dor(int fdc, char mask, char data)
     /*  */
 440 {
 441         register unsigned char drive, unit, newdor,olddor;
 442 
 443         cli();
 444         olddor = FDCS->dor;
 445         newdor =  (olddor & mask) | data;
 446         if ( newdor != olddor ){
 447                 unit = olddor & 0x3;
 448                 drive = REVDRIVE(fdc,unit);
 449                 if ( olddor & ( 0x10 << unit )){
 450                         if ( inb_p( FD_DIR ) & 0x80 )
 451                                 UDRS->flags |= FD_VERIFY;
 452                         else
 453                                 UDRS->last_checked=jiffies;
 454                 }
 455                 FDCS->dor = newdor;
 456                 outb_p( newdor, FD_DOR);
 457         }
 458         sti();
 459         return olddor;
 460 }
 461 
 462 static void twaddle(void)
     /*  */
 463 {
 464         cli();
 465         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 466         outb_p(FDCS->dor, FD_DOR);
 467         sti();
 468 }
 469 
 470 /* reset all driver information about the current fdc. This is needed after
 471  * a reset, and after a raw command. */
 472 static void reset_fdc_info(int mode)
     /*  */
 473 {
 474         int drive;
 475 
 476         FDCS->spec1 = FDCS->spec2 = -1;
 477         FDCS->need_configure = 1;
 478         FDCS->perp_mode = 1;
 479         FDCS->rawcmd = 0;
 480         for ( drive = 0; drive < N_DRIVE; drive++)
 481                 if (FDC(drive) == fdc &&
 482                     ( mode || UDRS->track != NEED_1_RECAL))
 483                         UDRS->track = NEED_2_RECAL;
 484 }
 485 
 486 /* selects the fdc and drive, and enables the fdc's its input/dma. */
 487 static void set_fdc(int drive)
     /*  */
 488 {
 489         if ( drive >= 0 ){
 490                 fdc = FDC(drive);
 491                 current_drive = drive;
 492         }
 493         set_dor(fdc,~0,8);
 494 #ifdef HAVE_2_CONTROLLERS
 495         set_dor(1-fdc, ~8, 0);
 496 #endif
 497         if ( FDCS->rawcmd == 2 )
 498                 reset_fdc_info(1);
 499         if( inb_p(FD_STATUS) != STATUS_READY )
 500                 FDCS->reset = 1;
 501 }
 502 
 503 /* locks the driver */
 504 static void lock_fdc(int drive)
     /*  */
 505 {
 506         cli();
 507         while (fdc_busy) sleep_on(&fdc_wait);
 508         fdc_busy = 1;
 509         sti();
 510         command_status = FD_COMMAND_NONE;
 511         set_fdc(drive);
 512         if ( drive >= 0 ){
 513                 timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
 514                 timer_active |= 1 << FLOPPY_TIMER;
 515         }
 516 }
 517 
 518 /* unlocks the driver */
 519 static inline int unlock_fdc(void)
     /*  */
 520 {
 521         if (current_drive < N_DRIVE)
 522                 floppy_off(current_drive);
 523         if (!fdc_busy)
 524                 printk(DEVICE_NAME ": FDC access conflict!\n");
 525 
 526         if ( DEVICE_INTR )
 527                 printk(DEVICE_NAME
 528                        ":device interrupt still active at FDC release: %p!\n",
 529                        DEVICE_INTR);
 530         command_status = FD_COMMAND_NONE;
 531         timer_active &= ~(1 << FLOPPY_TIMER);
 532         fdc_busy = 0;
 533         wake_up(&fdc_wait);
 534         return 0;
 535 }
 536 
 537 /* switches the motor off after a given timeout */
 538 static void motor_off_callback(unsigned long nr)
     /*  */
 539 {
 540         unsigned char mask = ~(0x10 << UNIT(nr));
 541 
 542         set_dor( FDC(nr), mask, 0 );
 543 }
 544 
 545 static struct timer_list motor_off_timer[N_DRIVE] = {
 546         { NULL, NULL, 0, 0, motor_off_callback },
 547         { NULL, NULL, 0, 1, motor_off_callback },
 548         { NULL, NULL, 0, 2, motor_off_callback },
 549         { NULL, NULL, 0, 3, motor_off_callback }
 550 #ifdef HAVE_2_CONTROLLERS
 551         ,{ NULL, NULL, 0, 4, motor_off_callback },
 552         { NULL, NULL, 0, 5, motor_off_callback },
 553         { NULL, NULL, 0, 6, motor_off_callback },
 554         { NULL, NULL, 0, 7, motor_off_callback }
 555 #endif
 556 };
 557 
 558 /* schedules motor off */
 559 static void floppy_off(unsigned int nr)
     /*  */
 560 {
 561         unsigned long volatile delta;
 562 
 563         cli();
 564         del_timer(motor_off_timer+nr);
 565 
 566         /* make spindle stop in a position which minimizes spinup time
 567          * next time */
 568         if ( drive_params[nr].rps ){
 569                 delta = jiffies - drive_state[nr].first_read_date + HZ -
 570                         drive_params[nr].spindown_offset;
 571                 delta = (( delta * drive_params[nr].rps) % HZ ) /
 572                         drive_params[nr].rps;
 573                 motor_off_timer[nr].expires = drive_params[nr].spindown - delta;
 574         }
 575         add_timer(motor_off_timer+nr);
 576         sti();
 577 }
 578 
 579 /*
 580  * cycle through all N_DRIVE floppy drives, for disk change testing.
 581  * stopping at current drive. This is done before any long operation, to
 582  * be sure to have up to date disk change information.
 583  */
 584 static void scandrives(void)
     /*  */
 585 {
 586         int i, drive, saved_drive;
 587 
 588         saved_drive = current_drive % N_DRIVE;
 589         for(i=0; i< N_DRIVE; i++){
 590                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 591                 if ( UDRS->fd_ref == 0 )
 592                         continue; /* skip closed drives */
 593                 set_fdc(drive);
 594                 UDRS->select_date = jiffies;
 595                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 596                       (0x10 << UNIT(drive))))
 597                         /* switch the motor off again, if it was off to
 598                          * begin with */
 599                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 600         }
 601         current_drive = saved_drive;
 602 }
 603 
 604 typedef void (*timeout_fn)(unsigned long);
 605 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 606 
 607 /* this function makes sure that the disk stays in the drive during the
 608  * transfer */
 609 static void fd_watchdog(void)
     /*  */
 610 {
 611         if ( inb_p( FD_DIR ) & 0x80 ){
 612                 floppy_shutdown();
 613         } else {
 614                 cli();
 615                 del_timer(&fd_timer);
 616                 fd_timer.function = (timeout_fn) fd_watchdog;
 617                 fd_timer.expires = 10;
 618                 add_timer(&fd_timer);
 619                 sti();
 620         }
 621 }
 622 
 623 static void main_command_interrupt(void)
     /*  */
 624 {
 625         del_timer(&fd_timer);
 626         cont->interrupt();
 627 }
 628 
 629 /* waits for a delay (spinup or select) to pass */
 630 static int wait_for_completion(int nr, int delay, timeout_fn function)
     /*  */
 631 {
 632         if ( FDCS->reset ){
 633                 reset_fdc(); /* do the reset during sleep to win time
 634                               * if we don't need to sleep, it's a good
 635                               * occasion anyways */
 636                 return 1;
 637         }
 638 
 639         if ( jiffies < delay ){
 640                 del_timer(&fd_timer);
 641                 fd_timer.function = function;
 642                 fd_timer.expires = delay  - jiffies;
 643                 add_timer(&fd_timer);
 644                 return 1;
 645         }
 646         return 0;
 647 }
 648 
 649 static void setup_DMA(void)
     /*  */
 650 {
 651 #ifdef SANITY
 652         if ((!CURRENT ||
 653              CURRENT->buffer != current_addr ||
 654              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 655             (current_addr < floppy_track_buffer ||
 656              current_addr + raw_cmd.length >
 657              floppy_track_buffer + 1024 * MAX_BUFFER_SECTORS)){
 658                 printk("bad address. start=%p lg=%lx tb=%p\n",
 659                        current_addr, raw_cmd.length, floppy_track_buffer);
 660                 if ( CURRENT ){
 661                         printk("buffer=%p nr=%lx cnr=%lx\n",
 662                                CURRENT->buffer, CURRENT->nr_sectors,
 663                                CURRENT->current_nr_sectors);
 664                 }
 665                 cont->done(0);
 666                 FDCS->reset=1;
 667                 return;
 668         }
 669         if ((long) current_addr % 512 ){
 670                 printk("non aligned address: %p\n", current_addr );
 671                 cont->done(0);
 672                 FDCS->reset=1;
 673                 return;
 674         }
 675         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 676             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 677                 printk("DMA crossing 64-K boundary %p-%p\n",
 678                        current_addr, current_addr + raw_cmd.length);
 679                 cont->done(0);
 680                 FDCS->reset=1;
 681                 return;
 682         }
 683 
 684 #endif
 685         cli();
 686         disable_dma(FLOPPY_DMA);
 687         clear_dma_ff(FLOPPY_DMA);
 688         set_dma_mode(FLOPPY_DMA,
 689                      (raw_cmd.flags & FD_RAW_READ)?
 690                      DMA_MODE_READ : DMA_MODE_WRITE);
 691         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 692         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 693         enable_dma(FLOPPY_DMA);
 694         sti();
 695 }
 696 
 697 /* sends a command byte to the fdc */
 698 static int output_byte(char byte)
     /*  */
 699 {
 700         int counter;
 701         unsigned char status;
 702 
 703         if (FDCS->reset)
 704                 return -1;
 705         for(counter = 0 ; counter < 10000 ; counter++) {
 706                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 707                 if (!(status & STATUS_READY))
 708                         continue;
 709                 if (status == STATUS_READY
 710 #ifdef FDC_FIFO_BUG
 711                     || ((status == STATUS_READY|STATUS_DIR|STATUS_BUSY) &&force)
 712 #endif
 713                     )
 714                 {
 715                         outb_p(byte,FD_DATA);
 716                         return 0;
 717                 } else
 718                         break;
 719         }
 720         FDCS->reset = 1;
 721         if ( !initialising )
 722                 printk(DEVICE_NAME ": Unable to send byte to FDC %d (%x)\n",
 723                        fdc, status);
 724         return -1;
 725 }
 726 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 727 
 728 #ifdef FDC_FIFO_BUG
 729 #define output_byte_force(x) force=1;output_byte(x);force=0;
 730 #else
 731 #define output_byte_force(x) output_byte(x);
 732 #endif
 733 
 734 /* gets the response from the fdc */
 735 static int result(void)
     /*  */
 736 {
 737         int i = 0, counter, status;
 738 
 739         if (FDCS->reset)
 740                 return -1;
 741         for (counter = 0 ; counter < 10000 ; counter++) {
 742                 status = inb_p(FD_STATUS)&
 743                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 744                 if (!(status & STATUS_READY))
 745                         continue;
 746                 if (status == STATUS_READY)
 747                         return i;
 748                 if (status & STATUS_DMA )
 749                         break;
 750                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 751                         if (i >= MAX_REPLIES) {
 752                                 printk(DEVICE_NAME
 753                                        ": floppy_stat reply overrun\n");
 754                                 break;
 755                         }
 756                         reply_buffer[i++] = inb_p(FD_DATA);
 757                 }
 758         }
 759         FDCS->reset = 1;
 760         if ( !initialising )
 761                 printk(DEVICE_NAME ": Getstatus times out (%x) on fdc %d [%d]\n",
 762                        status, fdc,i);
 763         return -1;
 764 }
 765 
 766 /* Set perpendicular mode as required, based on data rate, if supported.
 767  * 82077 Untested! 1Mbps data rate only possible with 82077-1.
 768  * TODO: increase MAX_BUFFER_SECTORS, add floppy_type entries.
 769  */
 770 static inline void perpendicular_mode(void)
     /*  */
 771 {
 772         unsigned char perp_mode;
 773 
 774         if (!floppy)
 775                 return;
 776         if (floppy->rate & 0x40){
 777                 switch(raw_cmd.rate){
 778                 case 0:
 779                         perp_mode=/*2*/3;
 780                         break;
 781                 case 3:
 782                         perp_mode=3;
 783                         break;
 784                 default:
 785                         printk(DEVICE_NAME
 786                                ": Invalid data rate for perpendicular mode!\n");
 787                         cont->done(0);
 788                         FDCS->reset = 1; /* convenient way to return to
 789                                           * redo without to much hassle (deep
 790                                           * stack et al. */
 791                         return;
 792                 }
 793         } else
 794                 perp_mode = 0;
 795                         
 796         if ( FDCS->perp_mode == perp_mode )
 797                 return;
 798         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 799                 output_byte(FD_PERPENDICULAR);
 800                 output_byte_force(perp_mode);
 801                 FDCS->perp_mode = perp_mode;
 802         } else if (perp_mode) {
 803                 printk(DEVICE_NAME
 804                        ": perpendicular mode not supported by this FDC.\n");
 805         }
 806 } /* perpendicular_mode */
 807 
 808 #define NOMINAL_DTR 500
 809 
 810 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
 811  * head load time, and DMA disable flag to values needed by floppy.
 812  *
 813  * The value "dtr" is the data transfer rate in Kbps.  It is needed
 814  * to account for the data rate-based scaling done by the 82072 and 82077
 815  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 816  * 8272a).
 817  *
 818  * Note that changing the data transfer rate has a (probably deleterious)
 819  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 820  * fdc_specify is called again after each data transfer rate
 821  * change.
 822  *
 823  * srt: 1000 to 16000 in microseconds
 824  * hut: 16 to 240 milliseconds
 825  * hlt: 2 to 254 milliseconds
 826  *
 827  * These values are rounded up to the next highest available delay time.
 828  */
 829 static void fdc_specify(void)
     /*  */
 830 {
 831         unsigned char spec1, spec2;
 832         int srt, hlt, hut;
 833         unsigned long dtr = NOMINAL_DTR;
 834         unsigned long scale_dtr = NOMINAL_DTR;
 835         int hlt_max_code = 0x7f;
 836         int hut_max_code = 0xf;
 837 
 838         if (FDCS->need_configure && FDCS->has_fifo) {
 839                 if ( FDCS->reset )
 840                         return;
 841                 /* Turn on FIFO for 82077-class FDC (improves performance) */
 842                 /* TODO: lock this in via LOCK during initialization */
 843                 output_byte(FD_CONFIGURE);
 844                 output_byte_force(0);
 845                 output_byte(0x1A);      /* FIFO on, polling off, 10 byte threshold */
 846                 output_byte_force(0);           /* precompensation from track 0 upwards */
 847                 if ( FDCS->reset ){
 848                         FDCS->has_fifo=0;
 849                         return;
 850                 }
 851                 FDCS->need_configure = 0;
 852                 /*printk(DEVICE_NAME ": FIFO enabled\n");*/
 853         }
 854 
 855         switch (raw_cmd.rate & 0x03) {
 856         case 3:
 857                 dtr = 1000;
 858                 break;
 859         case 1:
 860                 dtr = 300;
 861                 break;
 862         case 2:
 863                 dtr = 250;
 864                 break;
 865         }
 866 
 867         if (FDCS->version >= FDC_82072) {
 868                 scale_dtr = dtr;
 869                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
 870                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
 871         }
 872 
 873         /* Convert step rate from microseconds to milliseconds and 4 bits */
 874         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 875         if (srt > 0xf)
 876                 srt = 0xf;
 877         else if (srt < 0)
 878                 srt = 0;
 879 
 880         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 881         if (hlt < 0x01)
 882                 hlt = 0x01;
 883         else if (hlt > 0x7f)
 884                 hlt = hlt_max_code;
 885 
 886         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 887         if (hut < 0x1)
 888                 hut = 0x1;
 889         else if (hut > 0xf)
 890                 hut = hut_max_code;
 891 
 892         spec1 = (srt << 4) | hut;
 893 #define fd_disable_dma 0
 894         spec2 = (hlt << 1) | fd_disable_dma;
 895 
 896         /* If these parameters did not change, just return with success */
 897         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
 898                 /* Go ahead and set spec1 and spec2 */
 899                 output_byte(FD_SPECIFY);
 900                 output_byte(FDCS->spec1 = spec1);
 901                 output_byte(FDCS->spec2 = spec2);
 902         }
 903 } /* fdc_specify */
 904 
 905 /* Set the FDC's data transfer rate on behalf of the specified drive.
 906  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
 907  * of the specify command (i.e. using the fdc_specify function).
 908  */
 909 static void fdc_dtr(void)
     /*  */
 910 {
 911         /* If data rate not already set to desired value, set it. */
 912         if ( raw_cmd.rate == FDCS->dtr)
 913                 return;
 914         
 915         /* Set dtr */
 916         outb_p(raw_cmd.rate, FD_DCR);
 917         
 918         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
 919          * need a stabilization period of several milliseconds to be
 920          * enforced after data rate changes before R/W operations.
 921          * Pause 5 msec to avoid trouble.
 922          */
 923         udelay(5000);
 924         FDCS->dtr = raw_cmd.rate;
 925 } /* fdc_dtr */
 926 
 927 static void tell_sector(void)
     /*  */
 928 {
 929         printk(": track %d, head %d, sector %d, size %d",
 930                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
 931 } /* tell_sector */
 932 
 933 
 934 /*
 935  * Ok, this error interpreting routine is called after a
 936  * DMA read/write has succeeded
 937  * or failed, so we check the results, and copy any buffers.
 938  * hhb: Added better error reporting.
 939  * ak: Made this into a separate routine.
 940  */
 941 static int interpret_errors(void)
     /*  */
 942 {
 943         char bad;
 944 
 945         if (inr!=7) {
 946                 printk(DEVICE_NAME ": -- FDC reply error");
 947                 FDCS->reset = 1;
 948                 return 1;
 949         }
 950 
 951         /* check IC to find cause of interrupt */
 952         switch ((ST0 & ST0_INTR)>>6) {
 953                 case 1: /* error occured during command execution */
 954                         bad = 1;
 955                         if (ST1 & ST1_WP) {
 956                                 printk(DEVICE_NAME ": Drive %d is write protected\n", current_drive);
 957                                 DRS->flags &= ~FD_DISK_WRITABLE;
 958                                 cont->done(0);
 959                                 bad = 2;
 960                         } else if (ST1 & ST1_ND) {
 961                                 DRS->flags |= FD_NEED_TWADDLE;
 962                         } else if (ST1 & ST1_OR) {
 963                                 if (DP->flags & FTD_MSG )
 964                                         printk(DEVICE_NAME ": Over/Underrun - retrying\n");
 965                                 /* could continue from where we stopped, but ... */
 966                                 bad = 0;
 967                         }else if(*errors >= DP->max_errors.reporting){
 968                                 printk(DEVICE_NAME " %d: ", ST0 & ST0_DS);
 969                                 if (ST0 & ST0_ECE) {
 970                                         printk("Recalibrate failed!");
 971                                 } else if (ST2 & ST2_CRC) {
 972                                         printk("data CRC error");
 973                                         tell_sector();
 974                                 } else if (ST1 & ST1_CRC) {
 975                                         printk("CRC error");
 976                                         tell_sector();
 977                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
 978                                         if (!probing) {
 979                                                 printk("sector not found");
 980                                                 tell_sector();
 981                                         } else
 982                                                 printk("probe failed...");
 983                                 } else if (ST2 & ST2_WC) {      /* seek error */
 984                                         printk("wrong cylinder");
 985                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
 986                                         printk("bad cylinder");
 987                                 } else {
 988                                         printk("unknown error. ST[0..3] are: 0x%x 0x%x 0x%x 0x%x\n", ST0, ST1, ST2, ST3);
 989                                 }
 990                                 printk("\n");
 991 
 992                         }
 993                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
 994                                 /* wrong cylinder => recal */
 995                                 DRS->track = NEED_2_RECAL;
 996                         return bad;
 997                 case 2: /* invalid command given */
 998                         printk(DEVICE_NAME ": Invalid FDC command given!\n");
 999                         cont->done(0);
1000                         return 2;
1001                 case 3:
1002                         printk(DEVICE_NAME ": Abnormal termination caused by polling\n");
1003                         cont->error();
1004                         return 2;
1005                 default: /* (0) Normal command termination */
1006                         return 0;
1007         }
1008 }
1009 
1010 /*
1011  * This routine is called when everything should be correctly set up
1012  * for the transfer (ie floppy motor is on, the correct floppy is
1013  * selected, and the head is sitting on the right track).
1014  */
1015 static void setup_rw_floppy(void)
     /*  */
1016 {
1017         int i,ready_date,r, flags,dflags;
1018         timeout_fn function;
1019 
1020         flags = raw_cmd.flags;
1021         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1022                 flags |= FD_RAW_INTR;
1023 
1024         if (flags & FD_RAW_SPIN){
1025                 ready_date = DRS->spinup_date + DP->spinup;             
1026                 /* If spinup will take a long time, rerun scandrives
1027                  * again just before spinup completion. Beware that
1028                  * after scandrives, we must again wait for selection.
1029                  */
1030                 if ( ready_date > jiffies + DP->select_delay){
1031                         ready_date -= DP->select_delay;
1032                         function = (timeout_fn) floppy_on;
1033                 } else
1034                         function = (timeout_fn) setup_rw_floppy;
1035 
1036                 /* wait until the floppy is spinning fast enough */
1037                 if (wait_for_completion(current_drive,ready_date,function))
1038                         return;
1039         }
1040         dflags = DRS->flags;
1041 
1042         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)){
1043                 if ( flags & FD_RAW_USER_SUPPLIED )
1044                         buffer_track = -1;
1045                 setup_DMA();
1046         }
1047         
1048         if ( flags & FD_RAW_INTR )
1049                 SET_INTR(main_command_interrupt);
1050 
1051         r=0;
1052         for(i=0; i< raw_cmd.cmd_count; i++)
1053                 r|=output_byte( raw_cmd.cmd[i] );
1054 
1055 #ifdef DEBUGT
1056         debugt("rw_command: ");
1057 #endif
1058         if ( r ){
1059                 reset_fdc();
1060                 return;
1061         }
1062 
1063         if ( ! ( flags & FD_RAW_INTR )){
1064                 inr = result();
1065                 cont->interrupt();
1066         } else if ( flags & FD_RAW_NEED_DISK )
1067                 fd_watchdog();
1068 }
1069 
1070 /*
1071  * This is the routine called after every seek (or recalibrate) interrupt
1072  * from the floppy controller.
1073  */
1074 static void seek_interrupt(void)
     /*  */
1075 {
1076 #ifdef DEBUGT
1077         debugt("seek interrupt:");
1078 #endif
1079         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1080                 printk(DEVICE_NAME ": seek failed\n");
1081                 DRS->track = NEED_2_RECAL;
1082                 cont->error();
1083                 cont->redo();
1084                 return;
1085         }
1086         if ( DRS->track >= 0 && DRS->track != ST1 )
1087                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1088         DRS->track = ST1;
1089         seek_floppy();
1090 }
1091 
1092 static void seek_floppy(void)
     /*  */
1093 {
1094         int track;
1095 
1096         if ((raw_cmd.flags & FD_RAW_NEED_DISK) &&
1097             !(DRS->flags & FD_DISK_NEWCHANGE ) &&
1098             (inb_p(FD_DIR) & 0x80)){
1099                 /* the media changed flag should be cleared after the seek.
1100                  * If it isn't, this means that there is really no disk in
1101                  * the drive.
1102                  */
1103                 cont->done(0);
1104                 cont->redo();
1105                 return;
1106         }
1107         if ( DRS->track <= NEED_1_RECAL ){
1108                 recalibrate_floppy();
1109                 return;
1110         } else if ((DRS->flags & FD_DISK_NEWCHANGE) &&
1111                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1112                 /* we seek to clear the media-changed condition. Does anybody
1113                  * know a more elegant way, which works on all drives? */
1114                 if ( raw_cmd.track )
1115                         track = raw_cmd.track - 1;
1116                 else
1117                         track = 1;
1118         } else if (raw_cmd.track != DRS->track)
1119                 track = raw_cmd.track;
1120         else {
1121                 setup_rw_floppy();
1122                 return;
1123         }
1124 
1125         if ( !track && DRS->track >= 0 && DRS->track < 80 ){
1126                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1127                 /* if we go to track 0 anyways, we can just as well use
1128                  * recalibrate */
1129                 recalibrate_floppy();
1130         } else {
1131                 SET_INTR(seek_interrupt);
1132                 output_byte(FD_SEEK);
1133                 output_byte(UNIT(current_drive));
1134                 LAST_OUT(track);
1135 #ifdef DEBUGT
1136                 debugt("seek command:");
1137 #endif
1138         }
1139 }
1140 
1141 static void recal_interrupt(void)
     /*  */
1142 {
1143 #ifdef DEBUGT
1144         debugt("recal interrupt:");
1145 #endif
1146         if (inr !=2 )
1147                 FDCS->reset = 1;
1148         else if (ST0 & ST0_ECE) {
1149                 switch(DRS->track){
1150                 case NEED_1_RECAL:
1151                         /* after a second recalibrate, we still haven't
1152                          * reached track 0. Probably no drive */
1153                         cont->error();
1154                         cont->redo();
1155                         return;
1156                 case NEED_2_RECAL:
1157                         /* If we already did a recalibrate, and we are not at
1158                          * track 0, this means we have moved. (The only way
1159                          * not to move at recalibration is to be already at
1160                          * track 0.) Clear the new change flag
1161                          */
1162                         DRS->flags &= ~FD_DISK_NEWCHANGE;
1163                         /* fall through */
1164                 default:
1165                         /* Recalibrate moves the head by at most 80 steps. If
1166                          * after one recalibrate we don't have reached track
1167                          * 0, this might mean that we started beyond track 80.
1168                          * Try again.
1169                          */
1170                         DRS->track = NEED_1_RECAL;
1171                         break;
1172                 }
1173         } else
1174                 DRS->track = ST1;
1175         seek_floppy();
1176 }
1177 
1178 /*
1179  * Unexpected interrupt - Print as much debugging info as we can...
1180  * All bets are off...
1181  */
1182 static void unexpected_floppy_interrupt(void)
     /*  */
1183 {
1184         int i;
1185         if ( initialising )
1186                 return;
1187         printk(DEVICE_NAME ": unexpected interrupt\n");
1188         if ( inr >= 0 )
1189                 for(i=0; i<inr; i++)
1190                         printk("%d %x\n", i, reply_buffer[i] );
1191         while(1){
1192                 output_byte(FD_SENSEI);
1193                 inr=result();
1194                 if ( inr != 2 )
1195                         break;
1196                 printk("sensei\n");
1197                 for(i=0; i<inr; i++)
1198                         printk("%d %x\n", i, reply_buffer[i] );
1199         }
1200         FDCS->reset = 1;
1201 }
1202 
1203 /* interrupt handler */
1204 static void floppy_interrupt(int unused)
     /*  */
1205 {
1206         void (*handler)(void) = DEVICE_INTR;
1207 
1208         CLEAR_INTR;
1209         if ( fdc >= N_FDC ) /* we don't even know which FDC is the culprit */
1210                 return;
1211         inr = result();
1212         if (!handler){
1213                 unexpected_floppy_interrupt();
1214                 return;
1215         }
1216         if ( inr == 0 ){
1217                 do {
1218                         output_byte(FD_SENSEI);
1219                         inr = result();
1220                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1221         }
1222         sti(); /* this should help improve interrupt latency. */
1223         handler();
1224 }
1225 
1226 static void recalibrate_floppy(void)
     /*  */
1227 {
1228         SET_INTR(recal_interrupt);
1229         output_byte(FD_RECALIBRATE);
1230         LAST_OUT(UNIT(current_drive));
1231 }
1232 
1233 /*
1234  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1235  */
1236 static void reset_interrupt(void)
     /*  */
1237 {
1238 #ifdef DEBUGT
1239         debugt("reset interrupt:");
1240 #endif
1241         fdc_specify();          /* reprogram fdc */
1242         result();               /* get the status ready for set_fdc */
1243         if ( FDCS->reset )
1244                 cont->error(); /* a reset just after a reset. BAD! */
1245         cont->redo();
1246 }
1247 
1248 /*
1249  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1250  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1251  */
1252 static void reset_fdc(void)
     /*  */
1253 {
1254         SET_INTR(reset_interrupt);
1255         FDCS->reset = 0;
1256         reset_fdc_info(0);
1257         if ( FDCS->version >= FDC_82077 )
1258                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1259         else {
1260                 cli();
1261                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1262                 udelay(FD_RESET_DELAY);
1263                 outb(FDCS->dor, FD_DOR);
1264                 sti();
1265         }
1266 }
1267 
1268 static void floppy_shutdown(void)
     /*  */
1269 {
1270         cli();
1271         if ( !DEVICE_INTR ){ /* no interrupt pending. Probably has just been
1272                               * served */
1273                 sti();
1274                 return;
1275         }
1276         CLEAR_INTR;
1277         sti();
1278         if ( !initialising )
1279                 printk(DEVICE_NAME ": timeout\n");
1280         FDCS->reset = 1;
1281         cont->done(0);
1282         cont->redo(); /* this will recall reset when needed */
1283 }
1284 
1285 /* start motor, check media-changed condition and write protection */
1286 static int start_motor(void)
     /*  */
1287 {
1288         int cnt;
1289         int dir;
1290 
1291         if ( (FDCS->dor & 0x03) != UNIT(current_drive) )
1292                 /* notes select time if floppy is not yet selected */
1293                 DRS->select_date = jiffies;
1294 
1295         if ( ! ( FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1296                 set_debugt();
1297                 /* no read since this drive is running */
1298                 DRS->first_read_date = 0;
1299                 /* note motor start time if motor is not yet running */
1300                 DRS->spinup_date = jiffies;
1301         }
1302 
1303         /* starts motor and selects floppy */
1304         del_timer(motor_off_timer + current_drive);
1305         set_dor( fdc, 0xfc,
1306                 ( 0x10 << UNIT(current_drive) ) | UNIT(current_drive) );
1307 
1308         dir = inb_p( FD_DIR) & 0x80;
1309         if ( ! (dir & 0x80) )
1310                 DRS->last_checked =jiffies;
1311         if ( dir || ( DRS->flags & FD_VERIFY )) {
1312                 DRS->flags &= FD_DRIVE_PRESENT | FD_DISK_NEWCHANGE;
1313                 DRS->flags |= FD_DISK_WRITABLE;
1314 
1315                 /* check write protection */
1316                 output_byte( FD_GETSTATUS );
1317                 output_byte( UNIT(current_drive) );
1318                 if ( (cnt=result()) != 1 ){
1319                         changed_floppies |= 1 << current_drive;
1320                         FDCS->reset = 1;
1321                         DRS->flags |= FD_VERIFY;
1322                         return -1;
1323                 }
1324                 if ( ( ST3  & 0x60 ) == 0x60 )
1325                         DRS->flags &= ~FD_DISK_WRITABLE;
1326 
1327                 if ( ! ( DRS->flags & FD_DISK_NEWCHANGE) ){
1328                         /* the following code is only executed the first time
1329                          * a particular disk change has been detected */
1330                         changed_floppies |= 1 << current_drive;
1331                         if (DRS->keep_data >= 0) {
1332                                 if ((DP->flags & FTD_MSG) &&
1333                                     current_type[current_drive] != NULL)
1334                                         printk(DEVICE_NAME
1335                                                ": Disk type is undefined after "
1336                                                "disk change in fd%d\n",
1337                                                current_drive);
1338                                 current_type[current_drive] = NULL;
1339                                 floppy_sizes[current_drive] = MAX_DISK_SIZE;
1340                         }
1341                         if ( ST3 & 0x10 )
1342                                 DRS->track = 0;
1343                 }
1344         }
1345         if ( dir ) /* check if media changed is still on */
1346                 DRS->flags |= FD_DISK_NEWCHANGE;
1347         else {
1348                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1349                 DRS->last_checked =jiffies;
1350         }
1351 
1352         return DRS->flags;
1353 }
1354 
1355 static void floppy_ready(void)
     /*  */
1356 {
1357         CHECK_RESET;
1358         start_motor();
1359 
1360         /* wait_for_completion also schedules reset if needed. */
1361         if(wait_for_completion(current_drive,
1362                                DRS->select_date+DP->select_delay,
1363                                (timeout_fn) floppy_ready))
1364                 return;
1365         fdc_dtr();
1366         if ( raw_cmd.flags & FD_RAW_NEED_SEEK ){
1367                 perpendicular_mode();
1368                 fdc_specify(); /* must be done here because of hut, hlt ... */
1369                 seek_floppy();
1370         } else
1371                 setup_rw_floppy();
1372 }
1373 
1374 static void floppy_on(unsigned int drive)
     /*  */
1375 {
1376         timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
1377         timer_active |= 1 << FLOPPY_TIMER;
1378         scandrives();
1379         floppy_ready();
1380 }
1381 
1382 /*
1383  * ========================================================================
1384  * here ends the bottom half. Exported routines are:
1385   * floppy_on, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1386  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1387  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1388  * and set_dor.
1389  * ========================================================================
1390  */
1391 /*
1392  * General purpose continuations.
1393  * ==============================
1394  */
1395 static void empty(void)
     /*  */
1396 {
1397 }
1398 
1399 static void do_wakeup(void)
     /*  */
1400 {
1401         timer_active &= ~(1 << FLOPPY_TIMER);
1402         command_status += 2;
1403         wake_up(&command_done);
1404         cont = 0;
1405 }
1406 
1407 static struct cont_t wakeup_cont={
1408         empty,
1409         do_wakeup,
1410         empty,
1411         (done_f)empty
1412 };
1413 
1414 static int wait_til_done(void)
     /*  */
1415 {
1416         int ret;
1417         while(command_status < 2)
1418                 if (current->pid)
1419                         sleep_on( & command_done );
1420         if ( FDCS->reset )
1421                 command_status = FD_COMMAND_ERROR;
1422         if ( command_status == FD_COMMAND_OKAY )
1423                 ret=0;
1424         else
1425                 ret=-EIO;
1426         command_status = FD_COMMAND_NONE;
1427         return ret;
1428 }
1429 
1430 static void generic_done(int result)
     /*  */
1431 {
1432         command_status = result;
1433         cont = &wakeup_cont;
1434 }
1435 
1436 static void generic_success(void)
     /*  */
1437 {
1438         generic_done(1);
1439 }
1440 
1441 static void generic_failure(void)
     /*  */
1442 {
1443         generic_done(0);
1444 }
1445 
1446 static void success_and_wakeup(void)
     /*  */
1447 {
1448         generic_success();
1449         do_wakeup();
1450 }
1451 
1452 static void failure_and_wakeup(void)
     /*  */
1453 {
1454         generic_failure();
1455         do_wakeup();
1456 }
1457 
1458 /*
1459  * formatting and rw support.
1460  * ==========================
1461  */
1462 
1463 static int next_valid_format(void)
     /*  */
1464 {
1465         int probed_format;
1466         while(1){
1467                 probed_format = DRS->probed_format;
1468                 if ( probed_format > N_DRIVE ||
1469                     ! DP->autodetect[probed_format] ){
1470                         DRS->probed_format = 0;
1471                         return 1;
1472                 }
1473                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1474                         DRS->probed_format = probed_format;
1475                         return 0;
1476                 }
1477                 probed_format++;
1478         }
1479 }
1480 
1481 static void bad_flp_intr(void)
     /*  */
1482 {
1483         if ( probing ){
1484                 DRS->probed_format++;
1485                 if ( !next_valid_format())
1486                         return;
1487         }
1488         (*errors)++;
1489         if (*errors > DP->max_errors.abort)
1490                 cont->done(0);
1491         if (*errors > DP->max_errors.reset)
1492                 FDCS->reset = 1;
1493         else if (*errors > DP->max_errors.recal)
1494                 DRS->track = NEED_2_RECAL;
1495 }
1496 
1497 static void set_floppy(int device)
     /*  */
1498 {
1499         if (TYPE(device))
1500                 floppy = TYPE(device) + floppy_type;
1501         else
1502                 floppy = current_type[ DRIVE(device) ];
1503 }
1504 
1505 /*
1506  * formatting and support.
1507  * =======================
1508  */
1509 static void format_interrupt(void)
     /*  */
1510 {
1511         switch (interpret_errors()){
1512         case 1:
1513                 cont->error();
1514         case 2:
1515                 break;
1516         case 0:
1517                 cont->done(1);
1518         }
1519         cont->redo();
1520 }
1521 
1522 static void setup_format_params(void)
     /*  */
1523 {
1524         struct fparm {
1525                 unsigned char track,head,sect,size;
1526         } *here = (struct fparm *)floppy_track_buffer;
1527         int ssize,il,n;
1528         int count,head_shift,track_shift;
1529 
1530         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1531                 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
1532         raw_cmd.rate = floppy->rate & 0x3;
1533         raw_cmd.cmd_count = NR_F;
1534         COMMAND = FD_FORMAT;
1535         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1536         F_SIZECODE = FD_SIZECODE(floppy);
1537         ssize = 1 << ( F_SIZECODE - 2 );
1538         F_SECT_PER_TRACK = floppy->sect / ssize;
1539         F_GAP = floppy->fmt_gap;
1540         F_FILL = FD_FILL_BYTE;
1541 
1542         current_addr = floppy_track_buffer;
1543         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1544 
1545         /* allow for about 30ms for data transport per track */
1546         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1547 
1548         /* a ``cylinder'' is two tracks plus a little stepping time */
1549         track_shift = 2 * head_shift + 1;
1550 
1551         /* position of logical sector 1 on this track */
1552         n = (track_shift * format_req.track + head_shift * format_req.head )
1553                 % F_SECT_PER_TRACK;
1554 
1555         /* determine interleave */
1556         il = 1;
1557         if (floppy->sect > DP->interleave_sect && ssize==1)
1558                 il++;
1559 
1560         /* initialize field */
1561         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1562                 here[count].track = format_req.track;
1563                 here[count].head = format_req.head;
1564                 here[count].sect = 0;
1565                 here[count].size = F_SIZECODE;
1566         }
1567         /* place logical sectors */
1568         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1569                 here[n].sect = count;
1570                 n = (n+il) % F_SECT_PER_TRACK;
1571                 if (here[n].sect) { /* sector busy, find next free sector */
1572                         ++n;
1573                         if (n>= F_SECT_PER_TRACK) {
1574                                 n-=F_SECT_PER_TRACK;
1575                                 while (here[n].sect) ++n;
1576                         }
1577                 }
1578         }
1579 }
1580 
1581 static void redo_format(void)
     /*  */
1582 {
1583         raw_cmd.track = format_req.track << floppy->stretch;
1584         buffer_track = -1;
1585         setup_format_params();
1586         floppy_on(current_drive);
1587 #ifdef DEBUGT
1588         debugt("queue format request");
1589 #endif
1590 }
1591 
1592 static struct cont_t format_cont={
1593         format_interrupt,
1594         redo_format,
1595         bad_flp_intr,
1596         generic_done };
1597 
1598 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1599 {
1600         int okay;
1601 
1602         lock_fdc(DRIVE(device));
1603         set_floppy(device);
1604         if (!floppy ||
1605             tmp_format_req->track >= floppy->track ||
1606             tmp_format_req->head >= floppy->head){
1607                 unlock_fdc();
1608                 return -EINVAL;
1609         }
1610         format_req = *tmp_format_req;
1611         format_errors = 0;
1612         cont = &format_cont;
1613         errors = &format_errors;
1614         redo_format();
1615         okay=wait_til_done();
1616         unlock_fdc();
1617         return okay;
1618 }
1619 
1620 /*
1621  * Buffer read/write and support
1622  * =============================
1623  */
1624 
1625 /* new request_done. Can handle physical sectors which are smaller than a
1626  * logical buffer */
1627 static void request_done(int uptodate)
     /*  */
1628 {
1629         int block;
1630 
1631         probing = 0;
1632         timer_active &= ~(1 << FLOPPY_TIMER);
1633 
1634         if (!CURRENT){
1635                 printk(DEVICE_NAME
1636                        ": request list destroyed in floppy request done\n");
1637                 return;
1638         }
1639         if (uptodate){
1640                 /* maintain values for invalidation on geometry
1641                    change */
1642                 block = current_count_sectors + CURRENT->sector;
1643                 if (block > DRS->maxblock)
1644                         DRS->maxblock=block;
1645                 if ( block > floppy->sect)
1646                         DRS->maxtrack = 1;
1647 
1648                 /* unlock chained buffers */
1649                 while (current_count_sectors && CURRENT &&
1650                        current_count_sectors >= CURRENT->current_nr_sectors ){
1651                         current_count_sectors -= CURRENT->current_nr_sectors;
1652                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1653                         CURRENT->sector += CURRENT->current_nr_sectors;
1654                         end_request(1);
1655                 }
1656                 if ( current_count_sectors && CURRENT){
1657                         /* "unlock" last subsector */
1658                         CURRENT->buffer += current_count_sectors <<9;
1659                         CURRENT->current_nr_sectors -= current_count_sectors;
1660                         CURRENT->nr_sectors -= current_count_sectors;
1661                         CURRENT->sector += current_count_sectors;
1662                         return;
1663                 }
1664 
1665                 if ( current_count_sectors && ! CURRENT )
1666                         printk(DEVICE_NAME "request list destroyed in floppy request done\n");
1667 
1668         } else {
1669 #ifdef NO_WEIRD_UNLOCKED
1670                 if ( CURRENT->bh )
1671                         /* avoid those pesky "Weird unlocked ... errors" */
1672                         CURRENT->bh->b_req = 0;
1673 #endif
1674                 end_request(0);
1675         }
1676 }
1677 
1678 /* Interrupt handler evaluating the result of the r/w operation */
1679 static void rw_interrupt(void)
     /*  */
1680 {
1681 #if 0
1682         int i;
1683 #endif
1684         int nr_sectors, ssize;
1685         char bad;
1686 
1687         if ( ! DRS->first_read_date )
1688                 DRS->first_read_date = jiffies;
1689 
1690         nr_sectors = 0;
1691         ssize = 1 << (SIZECODE - 2);
1692         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1693                 floppy->sect + (R_SECTOR-SECTOR) * ssize -
1694                         (sector_t % floppy->sect) % ssize;
1695 
1696 #ifdef SANITY
1697         if ( nr_sectors > current_count_sectors + ssize -
1698             (current_count_sectors + sector_t) % ssize +
1699             sector_t % ssize){
1700                 printk(DEVICE_NAME ": long rw: %x instead of %lx\n",
1701                        nr_sectors, current_count_sectors);
1702                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
1703                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
1704                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
1705                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
1706                        sector_t, ssize);
1707         }
1708 #endif
1709         if ( nr_sectors < 0 )
1710                 nr_sectors = 0;
1711         if ( nr_sectors < current_count_sectors ){
1712 #if 0
1713                 printk(DEVICE_NAME ": short read got %d instead of %ld\n",
1714                        nr_sectors, current_count_sectors);
1715 #endif
1716 #if 0
1717                 printk("command: ");
1718                 for(i=0; i<raw_cmd.cmd_count; i++)
1719                         printk("%x ", raw_cmd.cmd[i]);
1720                 printk("rate=%x\n", raw_cmd.rate);
1721                 printk("reply: ");
1722                 for(i=0; i< inr; i++)
1723                         printk("%x ", reply_buffer[i]);
1724                 printk("\n");
1725 #endif
1726                 current_count_sectors = nr_sectors;
1727         }
1728 
1729         switch (interpret_errors()){
1730         case 2:
1731                 cont->redo();
1732                 return;
1733         case 1:
1734                 if (  !current_count_sectors){
1735                         cont->error();
1736                         cont->redo();
1737                         return;
1738                 }
1739                 break;
1740         case 0:
1741                 if (  !current_count_sectors){
1742                         int i;
1743                         printk(DEVICE_NAME ": dma problem?\n");
1744                         for(i=0; i< inr ; i++)
1745                                 printk("%2x,", reply_buffer[i]);
1746                         printk("\n");
1747                         bad=1;
1748                         cont->error();
1749                         cont->redo();
1750                         return;
1751                 }
1752                 current_type[current_drive] = floppy;
1753                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1754                         floppy->size >> 1;
1755                 break;
1756         }
1757 
1758         if (probing) {
1759                 if (DP->flags & FTD_MSG)
1760                         printk(DEVICE_NAME
1761                                ": Auto-detected floppy type %s in fd%d\n",
1762                                floppy->name,current_drive);
1763                 current_type[current_drive] = floppy;
1764                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1765                         floppy->size >> 1;
1766                 probing = 0;
1767         }
1768 
1769         if ( COMMAND != FD_READ || current_addr == CURRENT->buffer ){
1770                 /* transfer directly from buffer */
1771                 cont->done(1);
1772         } else if ( COMMAND == FD_READ){
1773                 buffer_track = raw_cmd.track;
1774                 buffer_drive = current_drive;
1775                 if ( nr_sectors + sector_t > buffer_max )
1776                         buffer_max = nr_sectors + sector_t;
1777         }
1778         cont->redo();
1779 }
1780 
1781 /* Compute maximal contiguous buffer size. */
1782 static int buffer_chain_size(void)
     /*  */
1783 {
1784         struct buffer_head *bh;
1785         int size;
1786         char *base;
1787 
1788         base = CURRENT->buffer;
1789         size = CURRENT->current_nr_sectors << 9;
1790         bh = CURRENT->bh;
1791 
1792 #ifdef SANITY
1793         if ( !bh ){
1794                 printk(DEVICE_NAME ": null request in buffer_chain_size\n");
1795                 return size >> 9;
1796         }
1797 #endif
1798 
1799         bh = bh->b_reqnext;
1800         while ( bh && bh->b_data == base + size ){
1801                 size += bh->b_size;
1802                 bh = bh->b_reqnext;
1803         }
1804         return size >> 9;
1805 }
1806 
1807 /* Compute the maximal transfer size */
1808 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
1809 {
1810         if ( max_sector > sector_t + max_size)
1811                 max_sector = sector_t + max_size;
1812 
1813         /* alignment */
1814         max_sector -= (max_sector % floppy->sect ) % ssize;
1815 
1816         /* transfer size, beginning not aligned */
1817         current_count_sectors = max_sector - sector_t ;
1818 
1819         return max_sector;
1820 }
1821 
1822 /*
1823  * Move data from/to the track buffer to/from the buffer cache.
1824  */
1825 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
1826 {
1827         int remaining; /* number of transferred 512-byte sectors */
1828         struct buffer_head *bh;
1829         char *buffer, *dma_buffer;
1830         int size;
1831 
1832         if ( max_sector > max_sector_2 )
1833                 max_sector = max_sector_2;
1834 
1835         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
1836 
1837         if (current_count_sectors <= 0 && COMMAND == FD_WRITE &&
1838             buffer_max > sector_t + CURRENT->nr_sectors){
1839                 current_count_sectors = buffer_max - sector_t;
1840                 if ( current_count_sectors > CURRENT->nr_sectors )
1841                         current_count_sectors = CURRENT->nr_sectors;
1842         }
1843         remaining = current_count_sectors << 9;
1844 #ifdef SANITY
1845         if ((remaining >> 9) > CURRENT->nr_sectors  && COMMAND == 0xc5 ){
1846                 printk(DEVICE_NAME ": in copy buffer\n");
1847                 printk("current_count_sectors=%ld\n", current_count_sectors);
1848                 printk("remaining=%d\n", remaining >> 9);
1849                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
1850                 printk("CURRENT->current_nr_sectors=%ld\n",
1851                        CURRENT->current_nr_sectors);
1852                 printk("max_sector=%d\n", max_sector);
1853                 printk("ssize=%d\n", ssize);
1854         }
1855 #endif
1856 
1857         if ( max_sector > buffer_max )
1858                 buffer_max = max_sector;
1859 
1860         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
1861 
1862         bh = CURRENT->bh;
1863         size = CURRENT->current_nr_sectors << 9;
1864         buffer = CURRENT->buffer;
1865 
1866         while ( remaining > 0){
1867                 if ( size > remaining )
1868                         size = remaining;
1869 #ifdef SANITY
1870                 if (!bh){
1871                         printk(DEVICE_NAME
1872                                ": bh=null in copy buffer before copy\n");
1873                         break;
1874                 }
1875                 if (dma_buffer + size >
1876                     floppy_track_buffer + ( 2 * MAX_BUFFER_SECTORS << 9 ) ||
1877                     dma_buffer < floppy_track_buffer ){
1878                         printk(DEVICE_NAME
1879                                ": buffer overrun in copy buffer %d\n",
1880                                (floppy_track_buffer - dma_buffer) >>9);
1881                         printk("sector_t=%d buffer_min=%d\n",
1882                                sector_t, buffer_min);
1883                         printk("current_count_sectors=%ld\n",
1884                                current_count_sectors);
1885                         if ( COMMAND == FD_READ )
1886                                 printk("read\n");
1887                         if ( COMMAND == FD_READ )
1888                                 printk("write\n");
1889                         break;
1890                 }
1891                 if ( ((int)buffer) % 512 )
1892                         printk(DEVICE_NAME ": %p buffer not aligned\n", buffer);
1893 #endif
1894                 if ( COMMAND == FD_READ )
1895                         memcpy( buffer, dma_buffer, size);
1896                 else
1897                         memcpy( dma_buffer, buffer, size);
1898                 remaining -= size;
1899                 if ( !remaining)
1900                         break;
1901 
1902                 dma_buffer += size;
1903                 bh = bh->b_reqnext;
1904 #ifdef SANITY
1905                 if ( !bh){
1906                         printk(DEVICE_NAME
1907                                ": bh=null in copy buffer after copy\n");
1908                         break;
1909                 }
1910 #endif
1911                 size = bh->b_size;
1912                 buffer = bh->b_data;
1913         }
1914 #ifdef SANITY
1915         if ( remaining ){
1916                 if ( remaining > 0 )
1917                         max_sector -= remaining >> 9;
1918                 printk(DEVICE_NAME
1919                        ": weirdness: remaining %d\n", remaining>>9);
1920         }
1921 #endif
1922 }
1923 
1924 /*
1925  * Formulate a read/write request.
1926  * this routine decides where to load the data (directly to buffer, or to
1927  * tmp floppy area), how much data to load (the size of the buffer, the whole
1928  * track, or a single sector)
1929  * All floppy_track_buffer handling goes in here. If we ever add track buffer
1930  * allocation on the fly, it should be done here. No other part should need
1931  * modification.
1932  */
1933 
1934 static int make_raw_rw_request(void)
     /*  */
1935 {
1936         int aligned_sector_t;
1937         int max_sector, max_size, tracksize, ssize;
1938 
1939         current_drive = DRIVE(CURRENT->dev);
1940 
1941         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
1942                 FD_RAW_NEED_SEEK;
1943         raw_cmd.cmd_count = NR_RW;
1944         if (CURRENT->cmd == READ){
1945                 raw_cmd.flags |= FD_RAW_READ;
1946                 COMMAND = FD_READ;
1947         } else if (CURRENT->cmd == WRITE){
1948                 raw_cmd.flags |= FD_RAW_WRITE;
1949                 COMMAND = FD_WRITE;
1950         } else {
1951                 printk(DEVICE_NAME
1952                        ": make_raw_rw_request: unknown command\n");
1953                 return 0;
1954         }
1955 
1956         max_sector = floppy->sect * floppy->head;
1957         TRACK = CURRENT->sector / max_sector;
1958         sector_t = CURRENT->sector % max_sector;
1959         if ( floppy->track && TRACK >= floppy->track )
1960                 return 0;
1961         HEAD = sector_t / floppy->sect;
1962 
1963         if ( (DRS->flags & FD_NEED_TWADDLE) && sector_t < floppy->sect )
1964                 max_sector = floppy->sect;
1965 
1966         /* 2M disks have phantom sectors on the first track */
1967         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
1968                 max_sector = 2 * floppy->sect / 3;
1969                 if (sector_t >= max_sector){
1970                         current_count_sectors =  (floppy->sect - sector_t);
1971                         if ( current_count_sectors > CURRENT->nr_sectors )
1972                                 current_count_sectors = CURRENT->nr_sectors;
1973                         return 1;
1974                 }
1975                 SIZECODE = 2;
1976         } else
1977                 SIZECODE = FD_SIZECODE(floppy);
1978         raw_cmd.rate = floppy->rate & 3;
1979         if ((floppy->rate & FD_2M) &&
1980             (TRACK || HEAD ) &&
1981             raw_cmd.rate == 2)
1982                 raw_cmd.rate = 1;
1983 
1984         SIZECODE2 = 0xff;
1985         raw_cmd.track = TRACK << floppy->stretch;
1986         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
1987         GAP = floppy->gap;
1988         ssize = 1 << (SIZECODE - 2 );
1989         SECT_PER_TRACK = floppy->sect / ssize;
1990         SECTOR = (sector_t % floppy->sect) / ssize + 1;
1991         tracksize = floppy->sect - floppy->sect % ssize;
1992         if ( tracksize < floppy->sect ){
1993                 SECT_PER_TRACK ++;
1994                 if (  tracksize <= sector_t % floppy->sect)
1995                         SECTOR--;
1996                 while ( tracksize <= sector_t % floppy->sect){
1997                         while( tracksize + ssize > floppy->sect ){
1998                                 SIZECODE--;
1999                                 ssize >>= 1;
2000                         }
2001                         SECTOR++; SECT_PER_TRACK ++;
2002                         tracksize += ssize;
2003                 }
2004                 max_sector = HEAD * floppy->sect + tracksize;
2005         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2006                 max_sector = floppy->sect;
2007 
2008         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2009         max_size = CURRENT->nr_sectors;
2010         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2011             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2012                 /* data already in track buffer */
2013                 if (COMMAND == FD_READ) {
2014                         copy_buffer(1, max_sector, buffer_max);
2015                         return 1;
2016                 }
2017         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2018                 if (COMMAND == FD_WRITE){
2019                         if(sector_t + CURRENT->nr_sectors > ssize &&
2020                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2021                                 max_size = ssize + ssize;
2022                         else
2023                                 max_size = ssize;
2024                 }
2025                 raw_cmd.flags &= ~FD_RAW_WRITE;
2026                 raw_cmd.flags |= FD_RAW_READ;
2027                 COMMAND = FD_READ;
2028         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2029                 int direct, indirect;
2030 
2031                 indirect= transfer_size(ssize,max_sector,MAX_BUFFER_SECTORS*2) -
2032                         sector_t;
2033 
2034                 max_size = buffer_chain_size();
2035                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2036                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2037                 /* 64 kb boundaries */
2038                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2039                      ((long) CURRENT->buffer ) / K_64 )
2040                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2041                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2042                 /*
2043                  * We try to read tracks, but if we get too many errors, we
2044                  * go back to reading just one sector at a time.
2045                  *
2046                  * This means we should be able to read a sector even if there
2047                  * are other bad sectors on this track.
2048                  */
2049                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2050                     *errors < DP->max_errors.read_track &&
2051                     /*!(DRS->flags & FD_NEED_TWADDLE) &&*/
2052                     ( ( !probing || (DP->read_track &
2053                            (1 <<DRS->probed_format))))){
2054                         max_size = CURRENT->nr_sectors;
2055                 } else {
2056                         current_addr = CURRENT->buffer;
2057                         raw_cmd.length = current_count_sectors << 9;
2058                         return 2;
2059                 }
2060         }
2061 
2062         if ( COMMAND == FD_READ )
2063                 max_size = max_sector; /* unbounded */
2064 
2065         /* claim buffer track if needed */
2066         if (buffer_track != raw_cmd.track ||  /* bad track */
2067             buffer_drive !=current_drive || /* bad drive */
2068             sector_t < buffer_min ||
2069             ((COMMAND == FD_READ ||
2070               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2071              max_sector > 2 * MAX_BUFFER_SECTORS + buffer_min &&
2072              max_size + sector_t > 2 * MAX_BUFFER_SECTORS + buffer_min)
2073             /* not enough space */ ){
2074                 buffer_track = -1;
2075                 buffer_drive = current_drive;
2076                 buffer_max = buffer_min = aligned_sector_t;
2077         }
2078         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2079 
2080         if ( COMMAND == FD_WRITE ){
2081                 /* copy write buffer to track buffer.
2082                  * if we get here, we know that the write
2083                  * is either aligned or the data already in the buffer
2084                  * (buffer will be overwritten) */
2085 #ifdef SANITY
2086                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2087                         printk(DEVICE_NAME
2088                                ": internal error offset !=0 on write\n");
2089 #endif
2090                 buffer_track = raw_cmd.track;
2091                 buffer_drive = current_drive;
2092                 copy_buffer(ssize, max_sector, 2*MAX_BUFFER_SECTORS+buffer_min);
2093         } else
2094                 transfer_size(ssize, max_sector,
2095                               2*MAX_BUFFER_SECTORS+buffer_min-aligned_sector_t);
2096 
2097         /* round up current_count_sectors to get dma xfer size */
2098         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2099         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2100         raw_cmd.length <<= 9;
2101 #ifdef SANITY
2102         if ((raw_cmd.length < current_count_sectors << 9) ||
2103             (current_addr != CURRENT->buffer && COMMAND == FD_WRITE &&
2104              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2105               aligned_sector_t < buffer_min )) ||
2106             raw_cmd.length % ( 512 << ( SIZECODE -2 )) ||
2107             raw_cmd.length <= 0 || current_count_sectors <= 0){
2108                 printk(DEVICE_NAME ": fractionary current count b=%lx s=%lx\n",
2109                        raw_cmd.length, current_count_sectors);
2110                 if ( current_addr != CURRENT->buffer )
2111                         printk("addr=%d, length=%ld\n",
2112                                (current_addr - floppy_track_buffer ) >> 9,
2113                                current_count_sectors);
2114                 printk("st=%d ast=%d mse=%d msi=%d\n",
2115                        sector_t, aligned_sector_t, max_sector, max_size);
2116                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2117                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2118                        COMMAND, SECTOR, HEAD, TRACK);
2119                 printk("buffer drive=%d\n", buffer_drive);
2120                 printk("buffer track=%d\n", buffer_track);
2121                 printk("buffer_min=%d\n", buffer_min );
2122                 printk("buffer_max=%d\n", buffer_max );
2123                 return 0;
2124         }
2125 
2126         if (current_addr != CURRENT->buffer ){
2127                 if (current_addr < floppy_track_buffer ||
2128                     current_count_sectors < 0 ||
2129                     raw_cmd.length < 0 ||
2130                     current_addr + raw_cmd.length >
2131                     floppy_track_buffer + ( 2 * MAX_BUFFER_SECTORS  << 9 )){
2132                         printk(DEVICE_NAME
2133                                ": buffer overrun in schedule dma\n");
2134                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2135                                sector_t, buffer_min,
2136                                raw_cmd.length >> 9 );
2137                         printk("current_count_sectors=%ld\n",
2138                                current_count_sectors);
2139                         if ( COMMAND == FD_READ )
2140                                 printk("read\n");
2141                         if ( COMMAND == FD_READ )
2142                                 printk("write\n");
2143                         return 0;
2144                 }
2145         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2146                    current_count_sectors > CURRENT->nr_sectors){
2147                 printk(DEVICE_NAME ": buffer overrun in direct transfer\n");
2148                 return 0;
2149         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2150                 printk(DEVICE_NAME ": more sectors than bytes\n");
2151                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2152                 printk("sectors=%ld\n", current_count_sectors);
2153         }
2154 #endif
2155         return 2;
2156 }
2157 
2158 static void redo_fd_request(void)
     /*  */
2159 {
2160 #define REPEAT {request_done(0); continue; }
2161         int device;
2162         int tmp;
2163 
2164         if (CURRENT && CURRENT->dev < 0) return;
2165         
2166         /* hooray, the goto is gone! */
2167         while(1){
2168                 if (!CURRENT) {
2169                         CLEAR_INTR;
2170                         unlock_fdc();
2171                         return;
2172                 }
2173                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2174                         panic(DEVICE_NAME ": request list destroyed");
2175                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2176                         panic(DEVICE_NAME ": block not locked");
2177                 
2178                 device = MINOR(CURRENT->dev);
2179                 set_fdc( DRIVE(device));
2180                 CHECK_RESET;
2181                 start_motor();
2182                 if (( changed_floppies | fake_change) & ( 1 << DRIVE(device))){
2183                         printk(DEVICE_NAME
2184                                ": disk absent or changed during operation\n");
2185                         REPEAT;
2186                 }
2187                 set_floppy(device);
2188                 if (!floppy) { /* Autodetection */
2189                         if (!probing){
2190                                 DRS->probed_format = 0;
2191                                 if ( next_valid_format() ){
2192                                         printk(DEVICE_NAME
2193                                                ": no autodetectable formats\n");
2194                                         floppy = NULL;
2195                                         REPEAT;
2196                                 }
2197                         }
2198                         probing = 1;
2199                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2200                 } else
2201                         probing = 0;
2202                 errors = & (CURRENT->errors);
2203                 tmp = make_raw_rw_request();
2204                 if ( tmp < 2 ){
2205                         request_done(tmp);
2206                         continue;
2207                 }
2208                 if ( DRS->flags & FD_NEED_TWADDLE )
2209                         twaddle();
2210                 floppy_on(current_drive);
2211 #ifdef DEBUGT
2212                 debugt("queue fd request");
2213 #endif
2214                 return;
2215         }
2216 #undef REPEAT
2217 }
2218 
2219 static struct cont_t rw_cont={
2220         rw_interrupt,
2221         redo_fd_request,
2222         bad_flp_intr,
2223         request_done };
2224 
2225 void do_fd_request(void)
     /*  */
2226 {
2227         lock_fdc(-1);
2228         cont = &rw_cont;
2229         redo_fd_request();
2230 }
2231 
2232 /*
2233  * User triggered reset
2234  * ====================
2235  */
2236 
2237 static void reset_intr(void)
     /*  */
2238 {
2239         printk("weird, reset interrupt called\n");
2240 }
2241 
2242 static struct cont_t reset_cont={
2243         reset_intr,
2244         success_and_wakeup,
2245         generic_failure,
2246         generic_done };
2247 
2248 static int user_reset_fdc(int drive, int arg)
     /*  */
2249 {
2250         int result;
2251 
2252         result=0;
2253         lock_fdc(drive);
2254         switch(arg){
2255         case FD_RESET_ALWAYS:
2256                 FDCS->reset=1;
2257                 break;
2258         case FD_RESET_IF_RAWCMD:
2259                 if(FDCS->rawcmd == 2 )
2260                         reset_fdc_info(1);
2261                 break;
2262         }
2263         if ( FDCS->reset ){
2264                 cont = &reset_cont;
2265                 timer_table[FLOPPY_TIMER].expires = jiffies + 5;
2266                 timer_active |= 1 << FLOPPY_TIMER;
2267                 reset_fdc();
2268                 result=wait_til_done();
2269         }
2270         unlock_fdc();
2271         return result;
2272 }
2273 
2274 /*
2275  * Misc Ioctl's and support
2276  * ========================
2277  */
2278 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2279 {
2280         int i;
2281 
2282         i = verify_area(VERIFY_WRITE,param,size);
2283         if (i)
2284                 return i;
2285         memcpy_tofs(param,(void *) address, size);
2286         return 0;
2287 }
2288 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2289 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2290 
2291 static void poll_drive(int drive)
     /*  */
2292 {
2293         lock_fdc(drive);
2294         start_motor();
2295         unlock_fdc();
2296 }
2297 
2298 static char *drive_name(int type, int drive )
     /*  */
2299 {
2300         struct floppy_struct *floppy;   
2301 
2302         if ( type )
2303                 floppy = floppy_type + type;
2304         else {
2305                 if ( UDP->native_format )
2306                         floppy = floppy_type + UDP->native_format;
2307                 else
2308                         return "(null)";
2309         }
2310         if ( floppy->name )
2311                 return floppy->name;
2312         else
2313                 return "(null)";
2314 }
2315 
2316 /* raw commands */
2317 static struct cont_t raw_cmd_cont={
2318         success_and_wakeup,
2319         failure_and_wakeup,
2320         generic_failure,
2321         generic_done };
2322 
2323 static int raw_cmd_ioctl(int drive, void *param)
     /*  */
2324 {
2325         int i, count, ret;
2326 
2327         if ( FDCS->rawcmd <= 1 )
2328                 FDCS->rawcmd = 1;
2329         for ( i= 0; i < N_DRIVE; i++){
2330                 if ( FDC(i) != fdc)
2331                         continue;
2332                 if ( i == drive ){
2333                         if ( drive_state[i].fd_ref > 1 )
2334                                 return -EBUSY;
2335                 } else if ( drive_state[i].fd_ref )
2336                         return -EBUSY;
2337         }
2338 
2339         if(FDCS->reset)
2340                 return -EIO;
2341 
2342         COPYIN(raw_cmd);
2343         raw_cmd.rate &= 0x03;   
2344         count = raw_cmd.length;
2345         if ((raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)) &&
2346             count > MAX_BUFFER_SECTORS * 512 * 2 )
2347                 return -ENOMEM;
2348 
2349         if ( raw_cmd.flags & FD_RAW_WRITE ){
2350                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2351                 if (i)
2352                         return i;
2353                 buffer_track = -1;
2354                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2355         }
2356 
2357         current_addr = floppy_track_buffer;
2358         raw_cmd.flags |= FD_RAW_USER_SUPPLIED;
2359         cont =  &raw_cmd_cont;
2360         floppy_on(current_drive);
2361         ret=wait_til_done();
2362 
2363         if ( !ret && !FDCS->reset ){
2364                 raw_cmd.reply_count = inr;
2365                 for( i=0; i< raw_cmd.reply_count; i++)
2366                         raw_cmd.reply[i] = reply_buffer[i];
2367                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2368                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2369         } else
2370                 ret = -EIO;
2371         DRS->track = NO_TRACK;
2372         if ( ret )
2373                 return ret;
2374 
2375         if ( raw_cmd.flags & FD_RAW_READ ){
2376                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2377                 if (i)
2378                         return i;
2379         }
2380 
2381         return COPYOUT(raw_cmd);
2382 }
2383 
2384 static int invalidate_drive(int rdev)
     /*  */
2385 {
2386         /* invalidate the buffer track to force a reread */
2387         cli();
2388         fake_change |= 1 << DRIVE(rdev);
2389         sti();
2390         unlock_fdc();
2391         check_disk_change(rdev);
2392         return 0;
2393 }
2394 
2395 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2396     unsigned long param)
2397 {
2398 #define IOCTL_MODE_BIT 8
2399 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2400 
2401         struct floppy_struct newparams;
2402         struct format_descr tmp_format_req;
2403         int i,device,drive,type,cnt;
2404         struct floppy_struct *this_floppy;
2405         char *name;
2406 
2407         device = MINOR(inode->i_rdev);
2408         switch (cmd) {
2409                 RO_IOCTLS(device,param);
2410         }
2411         type = TYPE(MINOR(device));
2412         drive = DRIVE(MINOR(device));
2413         switch (cmd) {
2414         case FDGETDRVTYP:
2415                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2416                 if (i)
2417                         return i;
2418                 name = drive_name(type,drive);
2419                 for ( cnt=0; cnt<16; cnt++){
2420                         put_fs_byte(name[cnt],
2421                                     ((char*)param)+cnt);
2422                         if ( ! *name )
2423                                 break;
2424                 }
2425                 return 0;
2426         case FDGETMAXERRS:
2427                 return COPYOUT(UDP->max_errors);
2428         case FDGETPRM:
2429                 if (type)
2430                         this_floppy = &floppy_type[type];
2431                 else if ((this_floppy = current_type[drive]) ==
2432                          NULL)
2433                         return -ENODEV;
2434                 return COPYOUT(this_floppy[0]);
2435         case FDPOLLDRVSTAT:
2436                 poll_drive(drive);
2437                 /* fall through */
2438         case FDGETDRVSTAT:
2439                 return COPYOUT(*UDRS);
2440         case FDGETFDCSTAT:
2441                 return COPYOUT(*UFDCS);
2442         case FDGETDRVPRM:
2443                 return COPYOUT(*UDP);
2444         }
2445         if (!IOCTL_ALLOWED)
2446                 return -EPERM;
2447         switch (cmd) {
2448         case FDRAWCMD:
2449                 if (type)
2450                         return -EINVAL;
2451                 lock_fdc(drive);
2452                 set_floppy(device);
2453                 i = raw_cmd_ioctl(drive, (void *) param);
2454                 unlock_fdc();
2455                 return i;
2456         case FDFMTTRK:
2457                 if (UDRS->fd_ref != 1)
2458                         return -EBUSY;
2459                 if (! (UDRS->flags & FD_DRIVE_PRESENT ))
2460                         return -ENXIO;
2461                 COPYIN(tmp_format_req);
2462                 return do_format(device, &tmp_format_req);
2463         case FDSETMAXERRS:
2464                 return COPYIN(UDP->max_errors);
2465         case FDFMTBEG:
2466                 return 0;
2467         case FDCLRPRM:
2468                 lock_fdc(drive);
2469                 current_type[drive] = NULL;
2470                 floppy_sizes[drive] = 2;
2471                 UDRS->keep_data = 0;
2472                 return invalidate_drive(device);
2473         case FDFMTEND:
2474         case FDFLUSH:
2475                 lock_fdc(drive);
2476                 return invalidate_drive(device);
2477         case FDSETPRM:
2478         case FDDEFPRM:
2479                 COPYIN(newparams);
2480                 /* sanity checking for parameters.*/
2481                 if(newparams.sect <= 0 ||
2482                    newparams.head <= 0 ||
2483                    newparams.track <= 0 ||
2484                    newparams.track >
2485                    UDP->tracks>>newparams.stretch)
2486                         return -EINVAL;
2487                 if ( type){
2488                         if ( !suser() )
2489                                 return -EPERM;
2490                         lock_fdc(-1);
2491                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2492                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2493                                     drive_state[cnt].fd_ref){
2494                                         cli(); fake_change |= 1 << cnt; sti();
2495                                 }
2496                         }
2497                         floppy_type[type] = newparams;
2498                         floppy_type[type].name="user format";
2499                         for (cnt = type << 2 ;
2500                              cnt < (type << 2 ) + 4 ;
2501                              cnt++)
2502                                 floppy_sizes[cnt]=
2503 #ifdef HAVE_2_CONTROLLERS
2504                                         floppy_sizes[cnt+0x80]=
2505 #endif
2506                                                 floppy_type[type].size>>1;
2507                         unlock_fdc();
2508                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2509                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2510                                     drive_state[cnt].fd_ref)
2511                                         check_disk_change(drive_state[cnt].
2512                                                           fd_device);
2513                         }
2514                         return 0;
2515                 }
2516 
2517                 lock_fdc(drive);
2518                 if ( cmd != FDDEFPRM )
2519                         /* notice a disk change immediately, else
2520                          * we loose our settings immediately*/
2521                         start_motor();
2522                 user_params[drive] = newparams;
2523                 if (buffer_drive == drive &&
2524                     buffer_max > user_params[drive].sect)
2525                         buffer_max=user_params[drive].sect;
2526                 current_type[drive] = &user_params[drive];
2527                 floppy_sizes[drive] = user_params[drive].size >> 1;
2528                 if (cmd == FDDEFPRM)
2529                         DRS->keep_data = -1;
2530                 else
2531                         DRS->keep_data = 1;
2532                 /* invalidation. Invalidate only when needed, i.e.
2533                  * when there are already sectors in the buffer cache
2534                  * whose number will change. This is useful, because
2535                  * mtools often changes the geometry of the disk after
2536                  * looking at the boot block */
2537                 if (DRS->maxblock >
2538                     user_params[drive].sect ||
2539                     DRS->maxtrack )
2540                         return invalidate_drive(device);
2541                 else
2542                         return unlock_fdc();
2543         case FDRESET:
2544                 return user_reset_fdc( drive, (int)param);
2545         case FDMSGON:
2546                 UDP->flags |= FTD_MSG;
2547                 return 0;
2548         case FDMSGOFF:
2549                 UDP->flags &= ~FTD_MSG;
2550                 return 0;
2551         case FDSETEMSGTRESH:
2552                 UDP->max_errors.reporting =
2553                         (unsigned short) (param & 0x0f);
2554                 return 0;
2555         case FDTWADDLE:
2556                 lock_fdc(drive);
2557                 twaddle();
2558                 unlock_fdc();
2559         }
2560         if ( ! suser() )
2561                 return -EPERM;
2562         switch(cmd){
2563         case FDSETDRVPRM:
2564                 return COPYIN(*UDP);
2565         default:
2566                 return -EINVAL;
2567         }
2568         return 0;
2569 #undef IOCTL_ALLOWED
2570 }
2571 
2572 #define CMOS_READ(addr) ({ \
2573 outb_p(addr,0x70); \
2574 inb_p(0x71); \
2575 })
2576 
2577 static void set_base_type(int drive,int code)
     /*  */
2578 {
2579         if (code > 0 && code <= NUMBER(default_drive_params)) {
2580                 memcpy((char *) UDP,
2581                        (char *) (&default_drive_params[code].params),
2582                        sizeof( struct floppy_drive_params ));
2583                 printk("fd%d is %s", drive, default_drive_params[code].name);
2584                 return;
2585         } else if (!code)
2586                 printk("fd%d is not installed", drive);
2587         else
2588                 printk("fd%d is unknown type %d",drive,code);
2589 }
2590 
2591 static void config_types(void)
     /*  */
2592 {
2593         int drive;
2594 
2595         for (drive=0; drive<N_DRIVE ; drive++){
2596                 /* default type for unidentifiable drives */
2597                 memcpy((char *) UDP, (char *) (&default_drive_params->params),
2598                        sizeof( struct floppy_drive_params ));
2599         }
2600         printk("Floppy drive(s): ");
2601         set_base_type(0, (CMOS_READ(0x10) >> 4) & 15);
2602         if (CMOS_READ(0x10) & 15) {
2603                 printk(", ");
2604                 set_base_type(1, CMOS_READ(0x10) & 15);
2605         }
2606         printk("\n");
2607 }
2608 
2609 
2610 static void maybe_check_change(int device)
     /*  */
2611 {
2612         register int drive;
2613 
2614         drive = DRIVE(device);
2615         if (UDRS->last_checked + UDP->checkfreq < jiffies  ||
2616             UDRS->flags & FD_VERIFY ||
2617             (( changed_floppies | fake_change ) & ( 1 << drive)))
2618                 check_disk_change(device);
2619 }
2620 
2621 int floppy_is_wp( int minor)
     /*  */
2622 {
2623         maybe_check_change(minor + (MAJOR_NR << 8));
2624         return ! ( drive_state[ DRIVE(minor) ].flags & FD_DISK_WRITABLE );
2625 }
2626 
2627 
2628 #define WRAPPER(op) \
2629 static int floppy_##op(struct inode * inode, struct file * filp, \
2630                      char * buf, int count) \
2631 { \
2632         maybe_check_change(inode->i_rdev);      \
2633         if ( changed_floppies & ( 1 << DRIVE(inode->i_rdev) )) \
2634                 return -ENXIO; \
2635         return block_##op(inode, filp, buf, count); \
2636 }
2637 
2638 WRAPPER(read)
2639 WRAPPER(write)
2640 
2641 static int exclusive = 0;
2642 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
2643 {
2644         int drive= DRIVE(inode->i_rdev);
2645 
2646         fsync_dev(inode->i_rdev);
2647         if ( UDRS->fd_ref < 0)
2648                 UDRS->fd_ref=0;
2649         else if (!UDRS->fd_ref--) {
2650                 printk(DEVICE_NAME ": floppy_release with fd_ref == 0");
2651                 UDRS->fd_ref = 0;
2652         }
2653         floppy_release_irq_and_dma();
2654         exclusive=0;
2655 }
2656 
2657 /*
2658  * floppy_open check for aliasing (/dev/fd0 can be the same as
2659  * /dev/PS0 etc), and disallows simultaneous access to the same
2660  * drive with different device numbers.
2661  */
2662 #define RETERR(x) \
2663         do{floppy_release(inode,filp); \
2664            return -(x);}while(0)
2665 static int usage_count = 0;
2666 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2667 {
2668         int drive;
2669         int old_dev;
2670 
2671         if (exclusive)
2672                 return -EBUSY;
2673 
2674         if (!filp) {
2675                 printk(DEVICE_NAME ": Weird, open called with filp=0\n");
2676                 return -EIO;
2677         }
2678 
2679         drive = DRIVE(inode->i_rdev);
2680         if ( drive >= N_DRIVE )
2681                 return -ENXIO;
2682 
2683         if (command_status == FD_COMMAND_DETECT && drive >= current_drive) {
2684                 lock_fdc(-1);
2685                 unlock_fdc();
2686         }
2687 
2688         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
2689                 return -ENXIO;
2690 
2691         if (filp->f_mode & 3) {
2692                 if ( !(UDRS->flags & FD_DRIVE_PRESENT))
2693                         return -ENXIO;
2694         }
2695 
2696         old_dev = UDRS->fd_device;
2697         if (UDRS->fd_ref && old_dev != inode->i_rdev)
2698                 return -EBUSY;
2699 
2700         if (filp->f_flags & O_EXCL) {
2701                 if (usage_count)
2702                         return -EBUSY;
2703                 else
2704                         exclusive = 1;
2705         }
2706 
2707         if (floppy_grab_irq_and_dma())
2708                 return -EBUSY;
2709 
2710         UDRS->fd_ref++;
2711         UDRS->fd_device = inode->i_rdev;
2712 
2713         if (old_dev && old_dev != inode->i_rdev) {
2714                 if (buffer_drive == drive)
2715                         buffer_track = -1;
2716                 invalidate_buffers(old_dev);
2717         }
2718 
2719         /* Allow ioctls if we have write-permissions even if read-only open */
2720         if ((filp->f_mode & 2) || permission(inode,2))
2721                 filp->f_mode |= IOCTL_MODE_BIT;
2722 
2723         if (UFDCS->rawcmd == 1)
2724                UFDCS->rawcmd = 2;
2725 
2726         if (filp->f_flags & O_NDELAY)
2727                 return 0;
2728 
2729         if (filp->f_mode && !(UDRS->flags & FD_DRIVE_PRESENT))
2730                 RETERR(ENXIO);
2731 
2732         if (user_reset_fdc(drive, FD_RESET_IF_NEEDED))
2733                 RETERR(EIO);
2734 
2735         if (filp->f_mode & 3) {
2736                 check_disk_change(inode->i_rdev);
2737                 if (changed_floppies & ( 1 << drive ))
2738                         RETERR(ENXIO);
2739         }
2740         if ((filp->f_mode & 2) && !(UDRS->flags & FD_DISK_WRITABLE))
2741                 RETERR(EROFS);
2742         return 0;
2743 #undef RETERR
2744 }
2745 
2746 /*
2747  * Acknowledge disk change
2748  */
2749 static int ack_change(int drive)
     /*  */
2750 {
2751         unsigned int mask = 1 << drive;
2752         UDRS->maxblock = 0;
2753         UDRS->maxtrack = 0;
2754         if ( buffer_drive == drive )
2755                 buffer_track = -1;
2756         fake_change &= ~mask;
2757         changed_floppies &= ~mask;
2758         return 1;
2759 }
2760 
2761 /*
2762  * Check if the disk has been changed or if a change has been faked.
2763  */
2764 static int check_floppy_change(dev_t dev)
     /*  */
2765 {
2766         int drive = DRIVE( dev );
2767         unsigned int mask = 1 << drive;
2768 
2769         if (MAJOR(dev) != MAJOR_NR) {
2770                 printk(DEVICE_NAME ": floppy_changed: not a floppy\n");
2771                 return 0;
2772         }
2773 
2774         if (fake_change & mask)
2775                 return ack_change(drive);
2776 
2777         if ((UDRS->flags & FD_VERIFY ) || (changed_floppies & mask) ||
2778             UDRS->last_checked + UDP->checkfreq <
2779             jiffies){
2780                 user_reset_fdc(drive, FD_RESET_IF_NEEDED);
2781                 poll_drive(drive);
2782                 if (changed_floppies & mask){
2783                         UDRS->generation++;
2784                         return ack_change(drive);
2785                 }
2786         }
2787         return 0;
2788 }
2789 
2790 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
2791  * the bootblock (block 0) */
2792 static int floppy_revalidate(dev_t dev)
     /*  */
2793 {
2794         struct buffer_head * bh;
2795 
2796         if ( TYPE(dev) || current_type[DRIVE(dev)] )
2797                 return 0;
2798         if (!(bh = getblk(dev,0,1024)))
2799                 return 1;
2800         if ( bh && ! bh->b_uptodate)
2801                 ll_rw_block(READ, 1, &bh);
2802         brelse(bh);
2803         return 0;
2804 }
2805 
2806 static struct file_operations floppy_fops = {
2807         NULL,                   /* lseek - default */
2808         floppy_read,            /* read - general block-dev read */
2809         floppy_write,           /* write - general block-dev write */
2810         NULL,                   /* readdir - bad */
2811         NULL,                   /* select */
2812         fd_ioctl,               /* ioctl */
2813         NULL,                   /* mmap */
2814         floppy_open,            /* open */
2815         floppy_release,         /* release */
2816         block_fsync,            /* fsync */
2817         NULL,                   /* fasync */
2818         check_floppy_change,    /* media_change */
2819         floppy_revalidate,      /* revalidate */
2820 };
2821 
2822 /*
2823  * Floppy Driver initialisation
2824  * =============================
2825  */
2826 
2827 /* Determine the floppy disk controller type */
2828 /* This routine was written by David C. Niemi */
2829 static char get_fdc_version(void)
     /*  */
2830 {
2831         int r;
2832 
2833         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
2834         if ( FDCS->reset )
2835                 return FDC_NONE;
2836         if ( (r = result()) <= 0x00)
2837                 return FDC_NONE;        /* No FDC present ??? */
2838         if ((r==1) && (reply_buffer[0] == 0x80)){
2839                 printk("FDC %d is a 8272A\n",fdc);
2840                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
2841         }
2842         if (r != 10) {
2843                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
2844                 return FDC_UNKNOWN;
2845         }
2846         output_byte(FD_VERSION);
2847         r = result();
2848         if ((r == 1) && (reply_buffer[0] == 0x80)){
2849                 printk("FDC %d is a 82072\n",fdc);
2850                 return FDC_82072;               /* 82072 doesn't know VERSION */
2851         }
2852         if ((r != 1) || (reply_buffer[0] != 0x90)) {
2853                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
2854                 return FDC_UNKNOWN;
2855         }
2856         output_byte(FD_UNLOCK);
2857         r = result();
2858         if ((r == 1) && (reply_buffer[0] == 0x80)){
2859                 printk("FDC %d is a pre-1991 82077\n", fdc);
2860                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
2861         }
2862         if ((r != 1) || (reply_buffer[0] != 0x00)) {
2863                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
2864                 return FDC_UNKNOWN;
2865         }
2866         printk("FDC %d is a post-1991 82077\n",fdc);
2867         return FDC_82077;       /* Revised 82077AA passes all the tests */
2868 } /* fdc_init */
2869 
2870 /*
2871  * Drive detection routine. This runs in the background while the kernel
2872  * does other (non floppy related) initialisation work.
2873  */
2874 static void detect_interrupt(void)
     /*  */
2875 {
2876         if ( DRS->track == 0 )
2877                 DRS->flags |= FD_DRIVE_PRESENT | FD_VERIFY;
2878         else if ( DRS->track != NEED_1_RECAL ){
2879                 floppy_ready();
2880                 return;
2881         }
2882         floppy_off(current_drive);
2883         current_drive++;
2884         if (current_drive == N_DRIVE ||
2885             fdc_state[FDC(current_drive)].version == FDC_NONE){
2886                 set_fdc(0);
2887                 unlock_fdc();
2888                 floppy_release_irq_and_dma();
2889                 return;
2890         }
2891         set_fdc(current_drive);
2892         floppy_ready(); /* next */
2893 }
2894 
2895 static struct cont_t detect_cont={
2896         detect_interrupt,
2897         detect_interrupt,
2898         empty,
2899         (done_f) empty };
2900 
2901 void floppy_init(void)
     /*  */
2902 {
2903         int i;
2904 
2905         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
2906                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
2907                 return;
2908         }
2909 
2910         for(i=0; i<256; i++)
2911                 if ( TYPE(i))
2912                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
2913                 else
2914                         floppy_sizes[i] = MAX_DISK_SIZE;
2915 
2916         blk_size[MAJOR_NR] = floppy_sizes;
2917         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
2918         timer_table[FLOPPY_TIMER].fn = floppy_shutdown;
2919         timer_active &= ~(1 << FLOPPY_TIMER);
2920         config_types();
2921 
2922         fdc_state[0].address = 0x3f0;
2923 #if N_FDC > 1
2924         fdc_state[1].address = 0x370;
2925 #endif
2926         for (i = 0 ; i < N_FDC ; i++) {
2927                 fdc = i;
2928                 FDCS->dtr = -1;
2929                 FDCS->dor = 0;
2930                 FDCS->reset = 0;
2931                 FDCS->version = FDC_NONE;
2932                 set_dor(fdc, ~0, 0xc );
2933         }
2934 
2935         /* initialise drive state */
2936         for (i = 0; i < N_DRIVE ; i++) {
2937                 current_drive = i;
2938                 DRS->flags = FD_VERIFY;
2939                 DRS->generation = 0;
2940                 DRS->keep_data = 0;
2941                 DRS->fd_ref = 0;
2942                 DRS->fd_device = 0;
2943         }
2944 
2945         floppy_grab_irq_and_dma();
2946         for (i = 0 ; i < N_FDC ; i++) {
2947                 fdc = i;
2948                 FDCS->rawcmd = 2;
2949                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED))
2950                         continue;
2951                 /* Try to determine the floppy controller type */
2952                 FDCS->version = get_fdc_version();
2953                 if (FDCS->version == FDC_NONE)
2954                         continue;
2955 
2956                 /* Not all FDCs seem to be able to handle the version command
2957                  * properly, so force a reset for the standard FDC clones,
2958                  * to avoid interrupt garbage.
2959                  */
2960                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
2961                 user_reset_fdc(-1,FD_RESET_ALWAYS);
2962         }
2963         fdc=0;
2964         current_drive = 0;
2965         lock_fdc(-1);
2966         initialising =0;
2967         command_status = FD_COMMAND_DETECT;
2968         cont = &detect_cont;
2969         raw_cmd.cmd_count = 0;
2970         raw_cmd.flags = FD_RAW_NEED_SEEK;
2971         raw_cmd.track = 0;
2972         floppy_ready();
2973         cli();
2974 }
2975 
2976 int floppy_grab_irq_and_dma(void)
     /*  */
2977 {
2978         if (usage_count++)
2979                 return 0;
2980         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
2981                 printk(DEVICE_NAME
2982                        ": Unable to grab IRQ%d for the floppy driver\n",
2983                        FLOPPY_IRQ);
2984                 return -1;
2985         }
2986         if (request_dma(FLOPPY_DMA,"floppy")) {
2987                 printk(DEVICE_NAME
2988                        ": Unable to grab DMA%d for the floppy driver\n",
2989                        FLOPPY_DMA);
2990                 free_irq(FLOPPY_IRQ);
2991                 return -1;
2992         }
2993         enable_irq(FLOPPY_IRQ);
2994         return 0;
2995 }
2996 
2997 void floppy_release_irq_and_dma(void)
     /*  */
2998 {
2999         if (--usage_count)
3000                 return;
3001         disable_dma(FLOPPY_DMA);
3002         free_dma(FLOPPY_DMA);
3003         disable_irq(FLOPPY_IRQ);
3004         free_irq(FLOPPY_IRQ);
3005 #ifdef HAVE_2_CONTROLLERS
3006         /* switch on first controller.
3007          * This saves us trouble on the next reboot. */
3008         set_dor(0, ~0, 8 );
3009         set_dor(1, ~8, 0 );
3010 #endif
3011 }
/* */
root/drivers/block/floppy.c

DEFINITIONS
