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 2
 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] = {
 302         NULL, NULL
 303 #ifdef HAVE_2_CONTROLLERS
 304         ,NULL, NULL, NULL, NULL, NULL, NULL
 305 #endif
 306 };
 307 
 308 /*
 309  * User-provided type information. current_type points to
 310  * the respective entry of this array.
 311  */
 312 struct floppy_struct user_params[N_DRIVE];
 313 
 314 static int floppy_sizes[256];
 315 
 316 /*
 317  * The driver is trying to determine the correct media format
 318  * while probing is set. rw_interrupt() clears it after a
 319  * successful access.
 320  */
 321 static int probing = 0;
 322 
 323 /* Synchronization of FDC access. */
 324 #define FD_COMMAND_DETECT -2
 325 #define FD_COMMAND_NONE -1
 326 #define FD_COMMAND_ERROR 2
 327 #define FD_COMMAND_OKAY 3
 328 
 329 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 330 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 331 
 332 /* Errors during formatting are counted here. */
 333 static int format_errors;
 334 
 335 /* Format request descriptor. */
 336 static struct format_descr format_req;
 337 
 338 /*
 339  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 340  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 341  * H is head unload time (1=16ms, 2=32ms, etc)
 342  */
 343 
 344 /*
 345  * Track buffer
 346  * Because these are written to by the DMA controller, they must
 347  * not contain a 64k byte boundary crossing, or data will be
 348  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 349  * Note that you must not change the sizes below without updating head.S.
 350  */
 351 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 352 
 353 int *errors;
 354 typedef void (*done_f)(int);
 355 struct cont_t {
 356 void (*interrupt)(void); /* this is called after the interrupt of the
 357                           * main command */
 358 void (*redo)(void); /* this is called to retry the operation */
 359 void (*error)(void); /* this is called to tally an error */
 360 done_f done; /* this is called to say if the operation has succeeded/failed */
 361 } *cont;
 362 
 363 static void floppy_ready(void);
 364 static void recalibrate_floppy(void);
 365 static void seek_floppy(void);
 366 static void floppy_shutdown(void);
 367 
 368 int floppy_grab_irq_and_dma(void);
 369 void floppy_release_irq_and_dma(void);
 370 
 371 /*
 372  * The "reset" variable should be tested whenever an interrupt is scheduled,
 373  * after the commands have been sent. This is to ensure that the driver doesn't
 374  * get wedged when the interrupt doesn't come because of a failed command.
 375  * reset doesn't need to be tested before sending commands, because
 376  * output_byte is automatically disabled when reset is set.
 377  */
 378 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 379 static void reset_fdc(void);
 380 
 381 /*
 382  * These are global variables, as that's the easiest way to give
 383  * information to interrupts. They are the data used for the current
 384  * request.
 385  */
 386 #define NO_TRACK -1
 387 #define NEED_1_RECAL -2
 388 #define NEED_2_RECAL -3
 389 
 390 /* buffer related variables */
 391 static int buffer_track = -1;
 392 static int buffer_drive = -1;
 393 static int buffer_min = -1;
 394 static int buffer_max = -1;
 395 
 396 #ifdef FDC_FIFO_BUG
 397 static int force=0;
 398 #endif
 399 
 400 /* fdc related variables, should end up in a struct */
 401 static struct floppy_fdc_state fdc_state[N_FDC];
 402 int fdc; /* current fdc */
 403 
 404 static struct floppy_struct * floppy = floppy_type;
 405 static unsigned char current_drive = 255;
 406 static long current_count_sectors = 0;
 407 static char *current_addr = 0;
 408 static unsigned char sector_t; /* sector in track */
 409 
 410 #ifdef DEBUGT
 411 long unsigned debugtimer;
 412 #endif
 413 
 414 /*
 415  * Debugging
 416  * =========
 417  */
 418 static inline void set_debugt(void)
     /*  */
 419 {
 420 #ifdef DEBUGT
 421         debugtimer = jiffies;
 422 #endif
 423 }
 424 
 425 static inline void debugt(char *message)
     /*  */
 426 {
 427 #ifdef DEBUGT
 428   if ( DP->flags & DEBUGT )
 429         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 430 #endif
 431 }
 432 
 433 /*
 434  * Bottom half floppy driver.
 435  * ==========================
 436  *
 437  * This part of the file contains the code talking directly to the hardware,
 438  * and also the main service loop (seek-configure-spinup-command)
 439  */
 440 static int set_dor(int fdc, char mask, char data)
     /*  */
 441 {
 442         register unsigned char drive, unit, newdor,olddor;
 443 
 444         cli();
 445         olddor = FDCS->dor;
 446         newdor =  (olddor & mask) | data;
 447         if ( newdor != olddor ){
 448                 unit = olddor & 0x3;
 449                 drive = REVDRIVE(fdc,unit);
 450                 if ( olddor & ( 0x10 << unit )){
 451                         if ( inb_p( FD_DIR ) & 0x80 )
 452                                 UDRS->flags |= FD_VERIFY;
 453                         else
 454                                 UDRS->last_checked=jiffies;
 455                 }
 456                 FDCS->dor = newdor;
 457                 outb_p( newdor, FD_DOR);
 458         }
 459         sti();
 460         return olddor;
 461 }
 462 
 463 static void twaddle(void)
     /*  */
 464 {
 465         cli();
 466         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 467         outb_p(FDCS->dor, FD_DOR);
 468         sti();
 469 }
 470 
 471 /* reset all driver information about the current fdc. This is needed after
 472  * a reset, and after a raw command. */
 473 static void reset_fdc_info(int mode)
     /*  */
 474 {
 475         int drive;
 476 
 477         FDCS->spec1 = FDCS->spec2 = -1;
 478         FDCS->need_configure = 1;
 479         FDCS->perp_mode = 1;
 480         FDCS->rawcmd = 0;
 481         for ( drive = 0; drive < N_DRIVE; drive++)
 482                 if (FDC(drive) == fdc &&
 483                     ( mode || UDRS->track != NEED_1_RECAL))
 484                         UDRS->track = NEED_2_RECAL;
 485 }
 486 
 487 /* selects the fdc and drive, and enables the fdc's input/dma. */
 488 static void set_fdc(int drive)
     /*  */
 489 {
 490         if ( drive >= 0 ){
 491                 fdc = FDC(drive);
 492                 current_drive = drive;
 493         }
 494         set_dor(fdc,~0,8);
 495 #ifdef HAVE_2_CONTROLLERS
 496         set_dor(1-fdc, ~8, 0);
 497 #endif
 498         if ( FDCS->rawcmd == 2 )
 499                 reset_fdc_info(1);
 500         if( inb_p(FD_STATUS) != STATUS_READY )
 501                 FDCS->reset = 1;
 502 }
 503 
 504 /* locks the driver */
 505 static void lock_fdc(int drive)
     /*  */
 506 {
 507         cli();
 508         while (fdc_busy) sleep_on(&fdc_wait);
 509         fdc_busy = 1;
 510         sti();
 511         command_status = FD_COMMAND_NONE;
 512         set_fdc(drive);
 513         if ( drive >= 0 ){
 514                 timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
 515                 timer_active |= 1 << FLOPPY_TIMER;
 516         }
 517 }
 518 
 519 /* unlocks the driver */
 520 static inline int unlock_fdc(void)
     /*  */
 521 {
 522         if (current_drive < N_DRIVE)
 523                 floppy_off(current_drive);
 524         if (!fdc_busy)
 525                 printk(DEVICE_NAME ": FDC access conflict!\n");
 526 
 527         if ( DEVICE_INTR )
 528                 printk(DEVICE_NAME
 529                        ":device interrupt still active at FDC release: %p!\n",
 530                        DEVICE_INTR);
 531         command_status = FD_COMMAND_NONE;
 532         timer_active &= ~(1 << FLOPPY_TIMER);
 533         fdc_busy = 0;
 534         wake_up(&fdc_wait);
 535         return 0;
 536 }
 537 
 538 /* switches the motor off after a given timeout */
 539 static void motor_off_callback(unsigned long nr)
     /*  */
 540 {
 541         unsigned char mask = ~(0x10 << UNIT(nr));
 542 
 543         set_dor( FDC(nr), mask, 0 );
 544 }
 545 
 546 static struct timer_list motor_off_timer[N_DRIVE] = {
 547         { NULL, NULL, 0, 0, motor_off_callback },
 548         { NULL, NULL, 0, 1, motor_off_callback }
 549 #ifdef HAVE_2_CONTROLLERS
 550         ,{ NULL, NULL, 0, 2, motor_off_callback },
 551         { NULL, NULL, 0, 3, motor_off_callback }
 552         ,{ NULL, NULL, 0, 4, motor_off_callback },
 553         { NULL, NULL, 0, 5, motor_off_callback },
 554         { NULL, NULL, 0, 6, motor_off_callback },
 555         { NULL, NULL, 0, 7, motor_off_callback }
 556 #endif
 557 };
 558 
 559 /* schedules motor off */
 560 static void floppy_off(unsigned int nr)
     /*  */
 561 {
 562         unsigned long volatile delta;
 563 
 564         cli();
 565         del_timer(motor_off_timer+nr);
 566 
 567         /* make spindle stop in a position which minimizes spinup time
 568          * next time */
 569         if ( drive_params[nr].rps ){
 570                 delta = jiffies - drive_state[nr].first_read_date + HZ -
 571                         drive_params[nr].spindown_offset;
 572                 delta = (( delta * drive_params[nr].rps) % HZ ) /
 573                         drive_params[nr].rps;
 574                 motor_off_timer[nr].expires = drive_params[nr].spindown - delta;
 575         }
 576         add_timer(motor_off_timer+nr);
 577         sti();
 578 }
 579 
 580 /*
 581  * cycle through all N_DRIVE floppy drives, for disk change testing.
 582  * stopping at current drive. This is done before any long operation, to
 583  * be sure to have up to date disk change information.
 584  */
 585 static void scandrives(void)
     /*  */
 586 {
 587         int i, drive, saved_drive;
 588 
 589         saved_drive = current_drive % N_DRIVE;
 590         for(i=0; i< N_DRIVE; i++){
 591                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 592                 if ( UDRS->fd_ref == 0 )
 593                         continue; /* skip closed drives */
 594                 set_fdc(drive);
 595                 UDRS->select_date = jiffies;
 596                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 597                       (0x10 << UNIT(drive))))
 598                         /* switch the motor off again, if it was off to
 599                          * begin with */
 600                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 601         }
 602         current_drive = saved_drive;
 603 }
 604 
 605 typedef void (*timeout_fn)(unsigned long);
 606 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 607 
 608 /* this function makes sure that the disk stays in the drive during the
 609  * transfer */
 610 static void fd_watchdog(void)
     /*  */
 611 {
 612         if ( inb_p( FD_DIR ) & 0x80 ){
 613                 floppy_shutdown();
 614         } else {
 615                 cli();
 616                 del_timer(&fd_timer);
 617                 fd_timer.function = (timeout_fn) fd_watchdog;
 618                 fd_timer.expires = 10;
 619                 add_timer(&fd_timer);
 620                 sti();
 621         }
 622 }
 623 
 624 static void main_command_interrupt(void)
     /*  */
 625 {
 626         del_timer(&fd_timer);
 627         cont->interrupt();
 628 }
 629 
 630 /* waits for a delay (spinup or select) to pass */
 631 static int wait_for_completion(int nr, int delay, timeout_fn function)
     /*  */
 632 {
 633         if ( FDCS->reset ){
 634                 reset_fdc(); /* do the reset during sleep to win time
 635                               * if we don't need to sleep, it's a good
 636                               * occasion anyways */
 637                 return 1;
 638         }
 639 
 640         if ( jiffies < delay ){
 641                 del_timer(&fd_timer);
 642                 fd_timer.function = function;
 643                 fd_timer.expires = delay  - jiffies;
 644                 add_timer(&fd_timer);
 645                 return 1;
 646         }
 647         return 0;
 648 }
 649 
 650 static void setup_DMA(void)
     /*  */
 651 {
 652 #ifdef SANITY
 653         if ((!CURRENT ||
 654              CURRENT->buffer != current_addr ||
 655              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 656             (current_addr < floppy_track_buffer ||
 657              current_addr + raw_cmd.length >
 658              floppy_track_buffer + 1024 * MAX_BUFFER_SECTORS)){
 659                 printk("bad address. start=%p lg=%lx tb=%p\n",
 660                        current_addr, raw_cmd.length, floppy_track_buffer);
 661                 if ( CURRENT ){
 662                         printk("buffer=%p nr=%lx cnr=%lx\n",
 663                                CURRENT->buffer, CURRENT->nr_sectors,
 664                                CURRENT->current_nr_sectors);
 665                 }
 666                 cont->done(0);
 667                 FDCS->reset=1;
 668                 return;
 669         }
 670         if ((long) current_addr % 512 ){
 671                 printk("non aligned address: %p\n", current_addr );
 672                 cont->done(0);
 673                 FDCS->reset=1;
 674                 return;
 675         }
 676         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 677             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 678                 printk("DMA crossing 64-K boundary %p-%p\n",
 679                        current_addr, current_addr + raw_cmd.length);
 680                 cont->done(0);
 681                 FDCS->reset=1;
 682                 return;
 683         }
 684 
 685 #endif
 686         cli();
 687         disable_dma(FLOPPY_DMA);
 688         clear_dma_ff(FLOPPY_DMA);
 689         set_dma_mode(FLOPPY_DMA,
 690                      (raw_cmd.flags & FD_RAW_READ)?
 691                      DMA_MODE_READ : DMA_MODE_WRITE);
 692         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 693         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 694         enable_dma(FLOPPY_DMA);
 695         sti();
 696 }
 697 
 698 /* sends a command byte to the fdc */
 699 static int output_byte(char byte)
     /*  */
 700 {
 701         int counter;
 702         unsigned char status;
 703 
 704         if (FDCS->reset)
 705                 return -1;
 706         for(counter = 0 ; counter < 10000 ; counter++) {
 707                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 708                 if (!(status & STATUS_READY))
 709                         continue;
 710                 if (status == STATUS_READY
 711 #ifdef FDC_FIFO_BUG
 712                     || ((status == STATUS_READY|STATUS_DIR|STATUS_BUSY) &&force)
 713 #endif
 714                     )
 715                 {
 716                         outb_p(byte,FD_DATA);
 717                         return 0;
 718                 } else
 719                         break;
 720         }
 721         FDCS->reset = 1;
 722         if ( !initialising )
 723                 printk(DEVICE_NAME ": Unable to send byte to FDC %d (%x)\n",
 724                        fdc, status);
 725         return -1;
 726 }
 727 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 728 
 729 #ifdef FDC_FIFO_BUG
 730 #define output_byte_force(x) force=1;output_byte(x);force=0;
 731 #else
 732 #define output_byte_force(x) output_byte(x);
 733 #endif
 734 
 735 /* gets the response from the fdc */
 736 static int result(void)
     /*  */
 737 {
 738         int i = 0, counter, status;
 739 
 740         if (FDCS->reset)
 741                 return -1;
 742         for (counter = 0 ; counter < 10000 ; counter++) {
 743                 status = inb_p(FD_STATUS)&
 744                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 745                 if (!(status & STATUS_READY))
 746                         continue;
 747                 if (status == STATUS_READY)
 748                         return i;
 749                 if (status & STATUS_DMA )
 750                         break;
 751                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 752                         if (i >= MAX_REPLIES) {
 753                                 printk(DEVICE_NAME
 754                                        ": floppy_stat reply overrun\n");
 755                                 break;
 756                         }
 757                         reply_buffer[i++] = inb_p(FD_DATA);
 758                 }
 759         }
 760         FDCS->reset = 1;
 761         if ( !initialising )
 762                 printk(DEVICE_NAME ": Getstatus times out (%x) on fdc %d [%d]\n",
 763                        status, fdc,i);
 764         return -1;
 765 }
 766 
 767 /* Set perpendicular mode as required, based on data rate, if supported.
 768  * 82077 Untested! 1Mbps data rate only possible with 82077-1.
 769  * TODO: increase MAX_BUFFER_SECTORS, add floppy_type entries.
 770  */
 771 static inline void perpendicular_mode(void)
     /*  */
 772 {
 773         unsigned char perp_mode;
 774 
 775         if (!floppy)
 776                 return;
 777         if (floppy->rate & 0x40){
 778                 switch(raw_cmd.rate){
 779                 case 0:
 780                         perp_mode=/*2*/3;
 781                         break;
 782                 case 3:
 783                         perp_mode=3;
 784                         break;
 785                 default:
 786                         printk(DEVICE_NAME
 787                                ": Invalid data rate for perpendicular mode!\n");
 788                         cont->done(0);
 789                         FDCS->reset = 1; /* convenient way to return to
 790                                           * redo without to much hassle (deep
 791                                           * stack et al. */
 792                         return;
 793                 }
 794         } else
 795                 perp_mode = 0;
 796                         
 797         if ( FDCS->perp_mode == perp_mode )
 798                 return;
 799         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 800                 output_byte(FD_PERPENDICULAR);
 801                 output_byte_force(perp_mode);
 802                 FDCS->perp_mode = perp_mode;
 803         } else if (perp_mode) {
 804                 printk(DEVICE_NAME
 805                        ": perpendicular mode not supported by this FDC.\n");
 806         }
 807 } /* perpendicular_mode */
 808 
 809 #define NOMINAL_DTR 500
 810 
 811 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
 812  * head load time, and DMA disable flag to values needed by floppy.
 813  *
 814  * The value "dtr" is the data transfer rate in Kbps.  It is needed
 815  * to account for the data rate-based scaling done by the 82072 and 82077
 816  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 817  * 8272a).
 818  *
 819  * Note that changing the data transfer rate has a (probably deleterious)
 820  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 821  * fdc_specify is called again after each data transfer rate
 822  * change.
 823  *
 824  * srt: 1000 to 16000 in microseconds
 825  * hut: 16 to 240 milliseconds
 826  * hlt: 2 to 254 milliseconds
 827  *
 828  * These values are rounded up to the next highest available delay time.
 829  */
 830 static void fdc_specify(void)
     /*  */
 831 {
 832         unsigned char spec1, spec2;
 833         int srt, hlt, hut;
 834         unsigned long dtr = NOMINAL_DTR;
 835         unsigned long scale_dtr = NOMINAL_DTR;
 836         int hlt_max_code = 0x7f;
 837         int hut_max_code = 0xf;
 838 
 839         if (FDCS->need_configure && FDCS->has_fifo) {
 840                 if ( FDCS->reset )
 841                         return;
 842                 /* Turn on FIFO for 82077-class FDC (improves performance) */
 843                 /* TODO: lock this in via LOCK during initialization */
 844                 output_byte(FD_CONFIGURE);
 845                 output_byte_force(0);
 846                 output_byte(0x1A);      /* FIFO on, polling off, 10 byte threshold */
 847                 output_byte_force(0);           /* precompensation from track 0 upwards */
 848                 if ( FDCS->reset ){
 849                         FDCS->has_fifo=0;
 850                         return;
 851                 }
 852                 FDCS->need_configure = 0;
 853                 /*printk(DEVICE_NAME ": FIFO enabled\n");*/
 854         }
 855 
 856         switch (raw_cmd.rate & 0x03) {
 857         case 3:
 858                 dtr = 1000;
 859                 break;
 860         case 1:
 861                 dtr = 300;
 862                 break;
 863         case 2:
 864                 dtr = 250;
 865                 break;
 866         }
 867 
 868         if (FDCS->version >= FDC_82072) {
 869                 scale_dtr = dtr;
 870                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
 871                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
 872         }
 873 
 874         /* Convert step rate from microseconds to milliseconds and 4 bits */
 875         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 876         if (srt > 0xf)
 877                 srt = 0xf;
 878         else if (srt < 0)
 879                 srt = 0;
 880 
 881         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 882         if (hlt < 0x01)
 883                 hlt = 0x01;
 884         else if (hlt > 0x7f)
 885                 hlt = hlt_max_code;
 886 
 887         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 888         if (hut < 0x1)
 889                 hut = 0x1;
 890         else if (hut > 0xf)
 891                 hut = hut_max_code;
 892 
 893         spec1 = (srt << 4) | hut;
 894 #define fd_disable_dma 0
 895         spec2 = (hlt << 1) | fd_disable_dma;
 896 
 897         /* If these parameters did not change, just return with success */
 898         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
 899                 /* Go ahead and set spec1 and spec2 */
 900                 output_byte(FD_SPECIFY);
 901                 output_byte(FDCS->spec1 = spec1);
 902                 output_byte(FDCS->spec2 = spec2);
 903         }
 904 } /* fdc_specify */
 905 
 906 /* Set the FDC's data transfer rate on behalf of the specified drive.
 907  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
 908  * of the specify command (i.e. using the fdc_specify function).
 909  */
 910 static void fdc_dtr(void)
     /*  */
 911 {
 912         /* If data rate not already set to desired value, set it. */
 913         if ( raw_cmd.rate == FDCS->dtr)
 914                 return;
 915         
 916         /* Set dtr */
 917         outb_p(raw_cmd.rate, FD_DCR);
 918         
 919         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
 920          * need a stabilization period of several milliseconds to be
 921          * enforced after data rate changes before R/W operations.
 922          * Pause 5 msec to avoid trouble.
 923          */
 924         udelay(5000);
 925         FDCS->dtr = raw_cmd.rate;
 926 } /* fdc_dtr */
 927 
 928 static void tell_sector(void)
     /*  */
 929 {
 930         printk(": track %d, head %d, sector %d, size %d",
 931                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
 932 } /* tell_sector */
 933 
 934 
 935 /*
 936  * Ok, this error interpreting routine is called after a
 937  * DMA read/write has succeeded
 938  * or failed, so we check the results, and copy any buffers.
 939  * hhb: Added better error reporting.
 940  * ak: Made this into a separate routine.
 941  */
 942 static int interpret_errors(void)
     /*  */
 943 {
 944         char bad;
 945 
 946         if (inr!=7) {
 947                 printk(DEVICE_NAME ": -- FDC reply error");
 948                 FDCS->reset = 1;
 949                 return 1;
 950         }
 951 
 952         /* check IC to find cause of interrupt */
 953         switch ((ST0 & ST0_INTR)>>6) {
 954                 case 1: /* error occured during command execution */
 955                         bad = 1;
 956                         if (ST1 & ST1_WP) {
 957                                 printk(DEVICE_NAME ": Drive %d is write protected\n", current_drive);
 958                                 DRS->flags &= ~FD_DISK_WRITABLE;
 959                                 cont->done(0);
 960                                 bad = 2;
 961                         } else if (ST1 & ST1_ND) {
 962                                 DRS->flags |= FD_NEED_TWADDLE;
 963                         } else if (ST1 & ST1_OR) {
 964                                 if (DP->flags & FTD_MSG )
 965                                         printk(DEVICE_NAME ": Over/Underrun - retrying\n");
 966                                 /* could continue from where we stopped, but ... */
 967                                 bad = 0;
 968                         }else if(*errors >= DP->max_errors.reporting){
 969                                 printk(DEVICE_NAME " %d: ", ST0 & ST0_DS);
 970                                 if (ST0 & ST0_ECE) {
 971                                         printk("Recalibrate failed!");
 972                                 } else if (ST2 & ST2_CRC) {
 973                                         printk("data CRC error");
 974                                         tell_sector();
 975                                 } else if (ST1 & ST1_CRC) {
 976                                         printk("CRC error");
 977                                         tell_sector();
 978                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
 979                                         if (!probing) {
 980                                                 printk("sector not found");
 981                                                 tell_sector();
 982                                         } else
 983                                                 printk("probe failed...");
 984                                 } else if (ST2 & ST2_WC) {      /* seek error */
 985                                         printk("wrong cylinder");
 986                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
 987                                         printk("bad cylinder");
 988                                 } else {
 989                                         printk("unknown error. ST[0..3] are: 0x%x 0x%x 0x%x 0x%x\n", ST0, ST1, ST2, ST3);
 990                                 }
 991                                 printk("\n");
 992 
 993                         }
 994                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
 995                                 /* wrong cylinder => recal */
 996                                 DRS->track = NEED_2_RECAL;
 997                         return bad;
 998                 case 2: /* invalid command given */
 999                         printk(DEVICE_NAME ": Invalid FDC command given!\n");
1000                         cont->done(0);
1001                         return 2;
1002                 case 3:
1003                         printk(DEVICE_NAME ": Abnormal termination caused by polling\n");
1004                         cont->error();
1005                         return 2;
1006                 default: /* (0) Normal command termination */
1007                         return 0;
1008         }
1009 }
1010 
1011 /*
1012  * This routine is called when everything should be correctly set up
1013  * for the transfer (ie floppy motor is on, the correct floppy is
1014  * selected, and the head is sitting on the right track).
1015  */
1016 static void setup_rw_floppy(void)
     /*  */
1017 {
1018         int i,ready_date,r, flags,dflags;
1019         timeout_fn function;
1020 
1021         flags = raw_cmd.flags;
1022         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1023                 flags |= FD_RAW_INTR;
1024 
1025         if (flags & FD_RAW_SPIN){
1026                 ready_date = DRS->spinup_date + DP->spinup;             
1027                 /* If spinup will take a long time, rerun scandrives
1028                  * again just before spinup completion. Beware that
1029                  * after scandrives, we must again wait for selection.
1030                  */
1031                 if ( ready_date > jiffies + DP->select_delay){
1032                         ready_date -= DP->select_delay;
1033                         function = (timeout_fn) floppy_on;
1034                 } else
1035                         function = (timeout_fn) setup_rw_floppy;
1036 
1037                 /* wait until the floppy is spinning fast enough */
1038                 if (wait_for_completion(current_drive,ready_date,function))
1039                         return;
1040         }
1041         dflags = DRS->flags;
1042 
1043         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE)){
1044                 if ( flags & FD_RAW_USER_SUPPLIED )
1045                         buffer_track = -1;
1046                 setup_DMA();
1047         }
1048         
1049         if ( flags & FD_RAW_INTR )
1050                 SET_INTR(main_command_interrupt);
1051 
1052         r=0;
1053         for(i=0; i< raw_cmd.cmd_count; i++)
1054                 r|=output_byte( raw_cmd.cmd[i] );
1055 
1056 #ifdef DEBUGT
1057         debugt("rw_command: ");
1058 #endif
1059         if ( r ){
1060                 reset_fdc();
1061                 return;
1062         }
1063 
1064         if ( ! ( flags & FD_RAW_INTR )){
1065                 inr = result();
1066                 cont->interrupt();
1067         } else if ( flags & FD_RAW_NEED_DISK )
1068                 fd_watchdog();
1069 }
1070 
1071 /*
1072  * This is the routine called after every seek (or recalibrate) interrupt
1073  * from the floppy controller.
1074  */
1075 static void seek_interrupt(void)
     /*  */
1076 {
1077 #ifdef DEBUGT
1078         debugt("seek interrupt:");
1079 #endif
1080         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1081                 printk(DEVICE_NAME ": seek failed\n");
1082                 DRS->track = NEED_2_RECAL;
1083                 cont->error();
1084                 cont->redo();
1085                 return;
1086         }
1087         if ( DRS->track >= 0 && DRS->track != ST1 )
1088                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1089         DRS->track = ST1;
1090         seek_floppy();
1091 }
1092 
1093 static void seek_floppy(void)
     /*  */
1094 {
1095         int track;
1096 
1097         if ((raw_cmd.flags & FD_RAW_NEED_DISK) &&
1098             !(DRS->flags & FD_DISK_NEWCHANGE ) &&
1099             (inb_p(FD_DIR) & 0x80)){
1100                 /* the media changed flag should be cleared after the seek.
1101                  * If it isn't, this means that there is really no disk in
1102                  * the drive.
1103                  */
1104                 cont->done(0);
1105                 cont->redo();
1106                 return;
1107         }
1108         if ( DRS->track <= NEED_1_RECAL ){
1109                 recalibrate_floppy();
1110                 return;
1111         } else if ((DRS->flags & FD_DISK_NEWCHANGE) &&
1112                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1113                 /* we seek to clear the media-changed condition. Does anybody
1114                  * know a more elegant way, which works on all drives? */
1115                 if ( raw_cmd.track )
1116                         track = raw_cmd.track - 1;
1117                 else
1118                         track = 1;
1119         } else if (raw_cmd.track != DRS->track)
1120                 track = raw_cmd.track;
1121         else {
1122                 setup_rw_floppy();
1123                 return;
1124         }
1125 
1126         if ( !track && DRS->track >= 0 && DRS->track < 80 ){
1127                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1128                 /* if we go to track 0 anyways, we can just as well use
1129                  * recalibrate */
1130                 recalibrate_floppy();
1131         } else {
1132                 SET_INTR(seek_interrupt);
1133                 output_byte(FD_SEEK);
1134                 output_byte(UNIT(current_drive));
1135                 LAST_OUT(track);
1136 #ifdef DEBUGT
1137                 debugt("seek command:");
1138 #endif
1139         }
1140 }
1141 
1142 static void recal_interrupt(void)
     /*  */
1143 {
1144 #ifdef DEBUGT
1145         debugt("recal interrupt:");
1146 #endif
1147         if (inr !=2 )
1148                 FDCS->reset = 1;
1149         else if (ST0 & ST0_ECE) {
1150                 switch(DRS->track){
1151                 case NEED_1_RECAL:
1152                         /* after a second recalibrate, we still haven't
1153                          * reached track 0. Probably no drive */
1154                         cont->error();
1155                         cont->redo();
1156                         return;
1157                 case NEED_2_RECAL:
1158                         /* If we already did a recalibrate, and we are not at
1159                          * track 0, this means we have moved. (The only way
1160                          * not to move at recalibration is to be already at
1161                          * track 0.) Clear the new change flag
1162                          */
1163                         DRS->flags &= ~FD_DISK_NEWCHANGE;
1164                         /* fall through */
1165                 default:
1166                         /* Recalibrate moves the head by at most 80 steps. If
1167                          * after one recalibrate we don't have reached track
1168                          * 0, this might mean that we started beyond track 80.
1169                          * Try again.
1170                          */
1171                         DRS->track = NEED_1_RECAL;
1172                         break;
1173                 }
1174         } else
1175                 DRS->track = ST1;
1176         seek_floppy();
1177 }
1178 
1179 /*
1180  * Unexpected interrupt - Print as much debugging info as we can...
1181  * All bets are off...
1182  */
1183 static void unexpected_floppy_interrupt(void)
     /*  */
1184 {
1185         int i;
1186         if ( initialising )
1187                 return;
1188         printk(DEVICE_NAME ": unexpected interrupt\n");
1189         if ( inr >= 0 )
1190                 for(i=0; i<inr; i++)
1191                         printk("%d %x\n", i, reply_buffer[i] );
1192         while(1){
1193                 output_byte(FD_SENSEI);
1194                 inr=result();
1195                 if ( inr != 2 )
1196                         break;
1197                 printk("sensei\n");
1198                 for(i=0; i<inr; i++)
1199                         printk("%d %x\n", i, reply_buffer[i] );
1200         }
1201         FDCS->reset = 1;
1202 }
1203 
1204 /* interrupt handler */
1205 static void floppy_interrupt(int unused)
     /*  */
1206 {
1207         void (*handler)(void) = DEVICE_INTR;
1208 
1209         CLEAR_INTR;
1210         if ( fdc >= N_FDC ) /* we don't even know which FDC is the culprit */
1211                 return;
1212         inr = result();
1213         if (!handler){
1214                 unexpected_floppy_interrupt();
1215                 return;
1216         }
1217         if ( inr == 0 ){
1218                 do {
1219                         output_byte(FD_SENSEI);
1220                         inr = result();
1221                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1222         }
1223         sti(); /* this should help improve interrupt latency. */
1224         handler();
1225 }
1226 
1227 static void recalibrate_floppy(void)
     /*  */
1228 {
1229         SET_INTR(recal_interrupt);
1230         output_byte(FD_RECALIBRATE);
1231         LAST_OUT(UNIT(current_drive));
1232 }
1233 
1234 /*
1235  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1236  */
1237 static void reset_interrupt(void)
     /*  */
1238 {
1239 #ifdef DEBUGT
1240         debugt("reset interrupt:");
1241 #endif
1242         fdc_specify();          /* reprogram fdc */
1243         result();               /* get the status ready for set_fdc */
1244         if ( FDCS->reset )
1245                 cont->error(); /* a reset just after a reset. BAD! */
1246         cont->redo();
1247 }
1248 
1249 /*
1250  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1251  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1252  */
1253 static void reset_fdc(void)
     /*  */
1254 {
1255         SET_INTR(reset_interrupt);
1256         FDCS->reset = 0;
1257         reset_fdc_info(0);
1258         if ( FDCS->version >= FDC_82077 )
1259                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1260         else {
1261                 cli();
1262                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1263                 udelay(FD_RESET_DELAY);
1264                 outb(FDCS->dor, FD_DOR);
1265                 sti();
1266         }
1267 }
1268 
1269 static void floppy_shutdown(void)
     /*  */
1270 {
1271         cli();
1272         if ( !DEVICE_INTR ){ /* no interrupt pending. Probably has just been
1273                               * served */
1274                 sti();
1275                 return;
1276         }
1277         CLEAR_INTR;
1278         sti();
1279         if ( !initialising )
1280                 printk(DEVICE_NAME ": timeout\n");
1281         FDCS->reset = 1;
1282         cont->done(0);
1283         cont->redo(); /* this will recall reset when needed */
1284 }
1285 
1286 /* start motor, check media-changed condition and write protection */
1287 static int start_motor(void)
     /*  */
1288 {
1289         int cnt;
1290         int dir;
1291 
1292         if ( (FDCS->dor & 0x03) != UNIT(current_drive) )
1293                 /* notes select time if floppy is not yet selected */
1294                 DRS->select_date = jiffies;
1295 
1296         if ( ! ( FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1297                 set_debugt();
1298                 /* no read since this drive is running */
1299                 DRS->first_read_date = 0;
1300                 /* note motor start time if motor is not yet running */
1301                 DRS->spinup_date = jiffies;
1302         }
1303 
1304         /* starts motor and selects floppy */
1305         del_timer(motor_off_timer + current_drive);
1306         set_dor( fdc, 0xfc,
1307                 ( 0x10 << UNIT(current_drive) ) | UNIT(current_drive) );
1308 
1309         dir = inb_p( FD_DIR) & 0x80;
1310         if ( ! (dir & 0x80) )
1311                 DRS->last_checked =jiffies;
1312         if ( dir || ( DRS->flags & FD_VERIFY )) {
1313                 DRS->flags &= FD_DRIVE_PRESENT | FD_DISK_NEWCHANGE;
1314                 DRS->flags |= FD_DISK_WRITABLE;
1315 
1316                 /* check write protection */
1317                 output_byte( FD_GETSTATUS );
1318                 output_byte( UNIT(current_drive) );
1319                 if ( (cnt=result()) != 1 ){
1320                         changed_floppies |= 1 << current_drive;
1321                         FDCS->reset = 1;
1322                         DRS->flags |= FD_VERIFY;
1323                         return -1;
1324                 }
1325                 if ( ( ST3  & 0x60 ) == 0x60 )
1326                         DRS->flags &= ~FD_DISK_WRITABLE;
1327 
1328                 if ( ! ( DRS->flags & FD_DISK_NEWCHANGE) ){
1329                         /* the following code is only executed the first time
1330                          * a particular disk change has been detected */
1331                         changed_floppies |= 1 << current_drive;
1332                         if (DRS->keep_data >= 0) {
1333                                 if ((DP->flags & FTD_MSG) &&
1334                                     current_type[current_drive] != NULL)
1335                                         printk(DEVICE_NAME
1336                                                ": Disk type is undefined after "
1337                                                "disk change in fd%d\n",
1338                                                current_drive);
1339                                 current_type[current_drive] = NULL;
1340                                 floppy_sizes[current_drive] = MAX_DISK_SIZE;
1341                         }
1342                         if ( ST3 & 0x10 )
1343                                 DRS->track = 0;
1344                 }
1345         }
1346         if ( dir ) /* check if media changed is still on */
1347                 DRS->flags |= FD_DISK_NEWCHANGE;
1348         else {
1349                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1350                 DRS->last_checked =jiffies;
1351         }
1352 
1353         return DRS->flags;
1354 }
1355 
1356 static void floppy_ready(void)
     /*  */
1357 {
1358         CHECK_RESET;
1359         start_motor();
1360 
1361         /* wait_for_completion also schedules reset if needed. */
1362         if(wait_for_completion(current_drive,
1363                                DRS->select_date+DP->select_delay,
1364                                (timeout_fn) floppy_ready))
1365                 return;
1366         fdc_dtr();
1367         if ( raw_cmd.flags & FD_RAW_NEED_SEEK ){
1368                 perpendicular_mode();
1369                 fdc_specify(); /* must be done here because of hut, hlt ... */
1370                 seek_floppy();
1371         } else
1372                 setup_rw_floppy();
1373 }
1374 
1375 static void floppy_on(unsigned int drive)
     /*  */
1376 {
1377         timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
1378         timer_active |= 1 << FLOPPY_TIMER;
1379         scandrives();
1380         floppy_ready();
1381 }
1382 
1383 /*
1384  * ========================================================================
1385  * here ends the bottom half. Exported routines are:
1386   * floppy_on, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1387  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1388  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1389  * and set_dor.
1390  * ========================================================================
1391  */
1392 /*
1393  * General purpose continuations.
1394  * ==============================
1395  */
1396 static void empty(void)
     /*  */
1397 {
1398 }
1399 
1400 static void do_wakeup(void)
     /*  */
1401 {
1402         timer_active &= ~(1 << FLOPPY_TIMER);
1403         command_status += 2;
1404         wake_up(&command_done);
1405         cont = 0;
1406 }
1407 
1408 static struct cont_t wakeup_cont={
1409         empty,
1410         do_wakeup,
1411         empty,
1412         (done_f)empty
1413 };
1414 
1415 static int wait_til_done(void)
     /*  */
1416 {
1417         int ret;
1418         while(command_status < 2)
1419                 if (current->pid)
1420                         sleep_on( & command_done );
1421         if ( FDCS->reset )
1422                 command_status = FD_COMMAND_ERROR;
1423         if ( command_status == FD_COMMAND_OKAY )
1424                 ret=0;
1425         else
1426                 ret=-EIO;
1427         command_status = FD_COMMAND_NONE;
1428         return ret;
1429 }
1430 
1431 static void generic_done(int result)
     /*  */
1432 {
1433         command_status = result;
1434         cont = &wakeup_cont;
1435 }
1436 
1437 static void generic_success(void)
     /*  */
1438 {
1439         generic_done(1);
1440 }
1441 
1442 static void generic_failure(void)
     /*  */
1443 {
1444         generic_done(0);
1445 }
1446 
1447 static void success_and_wakeup(void)
     /*  */
1448 {
1449         generic_success();
1450         do_wakeup();
1451 }
1452 
1453 static void failure_and_wakeup(void)
     /*  */
1454 {
1455         generic_failure();
1456         do_wakeup();
1457 }
1458 
1459 /*
1460  * formatting and rw support.
1461  * ==========================
1462  */
1463 
1464 static int next_valid_format(void)
     /*  */
1465 {
1466         int probed_format;
1467         while(1){
1468                 probed_format = DRS->probed_format;
1469                 if ( probed_format > N_DRIVE ||
1470                     ! DP->autodetect[probed_format] ){
1471                         DRS->probed_format = 0;
1472                         return 1;
1473                 }
1474                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1475                         DRS->probed_format = probed_format;
1476                         return 0;
1477                 }
1478                 probed_format++;
1479         }
1480 }
1481 
1482 static void bad_flp_intr(void)
     /*  */
1483 {
1484         if ( probing ){
1485                 DRS->probed_format++;
1486                 if ( !next_valid_format())
1487                         return;
1488         }
1489         (*errors)++;
1490         if (*errors > DP->max_errors.abort)
1491                 cont->done(0);
1492         if (*errors > DP->max_errors.reset)
1493                 FDCS->reset = 1;
1494         else if (*errors > DP->max_errors.recal)
1495                 DRS->track = NEED_2_RECAL;
1496 }
1497 
1498 static void set_floppy(int device)
     /*  */
1499 {
1500         if (TYPE(device))
1501                 floppy = TYPE(device) + floppy_type;
1502         else
1503                 floppy = current_type[ DRIVE(device) ];
1504 }
1505 
1506 /*
1507  * formatting and support.
1508  * =======================
1509  */
1510 static void format_interrupt(void)
     /*  */
1511 {
1512         switch (interpret_errors()){
1513         case 1:
1514                 cont->error();
1515         case 2:
1516                 break;
1517         case 0:
1518                 cont->done(1);
1519         }
1520         cont->redo();
1521 }
1522 
1523 static void setup_format_params(void)
     /*  */
1524 {
1525         struct fparm {
1526                 unsigned char track,head,sect,size;
1527         } *here = (struct fparm *)floppy_track_buffer;
1528         int ssize,il,n;
1529         int count,head_shift,track_shift;
1530 
1531         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1532                 FD_RAW_NEED_DISK | FD_RAW_NEED_SEEK;
1533         raw_cmd.rate = floppy->rate & 0x3;
1534         raw_cmd.cmd_count = NR_F;
1535         COMMAND = FD_FORMAT;
1536         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1537         F_SIZECODE = FD_SIZECODE(floppy);
1538         ssize = 1 << ( F_SIZECODE - 2 );
1539         F_SECT_PER_TRACK = floppy->sect / ssize;
1540         F_GAP = floppy->fmt_gap;
1541         F_FILL = FD_FILL_BYTE;
1542 
1543         current_addr = floppy_track_buffer;
1544         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1545 
1546         /* allow for about 30ms for data transport per track */
1547         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1548 
1549         /* a ``cylinder'' is two tracks plus a little stepping time */
1550         track_shift = 2 * head_shift + 1;
1551 
1552         /* position of logical sector 1 on this track */
1553         n = (track_shift * format_req.track + head_shift * format_req.head )
1554                 % F_SECT_PER_TRACK;
1555 
1556         /* determine interleave */
1557         il = 1;
1558         if (floppy->sect > DP->interleave_sect && ssize==1)
1559                 il++;
1560 
1561         /* initialize field */
1562         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1563                 here[count].track = format_req.track;
1564                 here[count].head = format_req.head;
1565                 here[count].sect = 0;
1566                 here[count].size = F_SIZECODE;
1567         }
1568         /* place logical sectors */
1569         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1570                 here[n].sect = count;
1571                 n = (n+il) % F_SECT_PER_TRACK;
1572                 if (here[n].sect) { /* sector busy, find next free sector */
1573                         ++n;
1574                         if (n>= F_SECT_PER_TRACK) {
1575                                 n-=F_SECT_PER_TRACK;
1576                                 while (here[n].sect) ++n;
1577                         }
1578                 }
1579         }
1580 }
1581 
1582 static void redo_format(void)
     /*  */
1583 {
1584         raw_cmd.track = format_req.track << floppy->stretch;
1585         buffer_track = -1;
1586         setup_format_params();
1587         floppy_on(current_drive);
1588 #ifdef DEBUGT
1589         debugt("queue format request");
1590 #endif
1591 }
1592 
1593 static struct cont_t format_cont={
1594         format_interrupt,
1595         redo_format,
1596         bad_flp_intr,
1597         generic_done };
1598 
1599 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1600 {
1601         int okay;
1602 
1603         lock_fdc(DRIVE(device));
1604         set_floppy(device);
1605         if (!floppy ||
1606             tmp_format_req->track >= floppy->track ||
1607             tmp_format_req->head >= floppy->head){
1608                 unlock_fdc();
1609                 return -EINVAL;
1610         }
1611         format_req = *tmp_format_req;
1612         format_errors = 0;
1613         cont = &format_cont;
1614         errors = &format_errors;
1615         redo_format();
1616         okay=wait_til_done();
1617         unlock_fdc();
1618         return okay;
1619 }
1620 
1621 /*
1622  * Buffer read/write and support
1623  * =============================
1624  */
1625 
1626 /* new request_done. Can handle physical sectors which are smaller than a
1627  * logical buffer */
1628 static void request_done(int uptodate)
     /*  */
1629 {
1630         int block;
1631 
1632         probing = 0;
1633         timer_active &= ~(1 << FLOPPY_TIMER);
1634 
1635         if (!CURRENT){
1636                 printk(DEVICE_NAME
1637                        ": request list destroyed in floppy request done\n");
1638                 return;
1639         }
1640         if (uptodate){
1641                 /* maintain values for invalidation on geometry
1642                    change */
1643                 block = current_count_sectors + CURRENT->sector;
1644                 if (block > DRS->maxblock)
1645                         DRS->maxblock=block;
1646                 if ( block > floppy->sect)
1647                         DRS->maxtrack = 1;
1648 
1649                 /* unlock chained buffers */
1650                 while (current_count_sectors && CURRENT &&
1651                        current_count_sectors >= CURRENT->current_nr_sectors ){
1652                         current_count_sectors -= CURRENT->current_nr_sectors;
1653                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1654                         CURRENT->sector += CURRENT->current_nr_sectors;
1655                         end_request(1);
1656                 }
1657                 if ( current_count_sectors && CURRENT){
1658                         /* "unlock" last subsector */
1659                         CURRENT->buffer += current_count_sectors <<9;
1660                         CURRENT->current_nr_sectors -= current_count_sectors;
1661                         CURRENT->nr_sectors -= current_count_sectors;
1662                         CURRENT->sector += current_count_sectors;
1663                         return;
1664                 }
1665 
1666                 if ( current_count_sectors && ! CURRENT )
1667                         printk(DEVICE_NAME "request list destroyed in floppy request done\n");
1668 
1669         } else {
1670 #ifdef NO_WEIRD_UNLOCKED
1671                 if ( CURRENT->bh )
1672                         /* avoid those pesky "Weird unlocked ... errors" */
1673                         CURRENT->bh->b_req = 0;
1674 #endif
1675                 end_request(0);
1676         }
1677 }
1678 
1679 /* Interrupt handler evaluating the result of the r/w operation */
1680 static void rw_interrupt(void)
     /*  */
1681 {
1682 #if 0
1683         int i;
1684 #endif
1685         int nr_sectors, ssize;
1686         char bad;
1687 
1688         if ( ! DRS->first_read_date )
1689                 DRS->first_read_date = jiffies;
1690 
1691         nr_sectors = 0;
1692         ssize = 1 << (SIZECODE - 2);
1693         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1694                 floppy->sect + (R_SECTOR-SECTOR) * ssize -
1695                         (sector_t % floppy->sect) % ssize;
1696 
1697 #ifdef SANITY
1698         if ( nr_sectors > current_count_sectors + ssize -
1699             (current_count_sectors + sector_t) % ssize +
1700             sector_t % ssize){
1701                 printk(DEVICE_NAME ": long rw: %x instead of %lx\n",
1702                        nr_sectors, current_count_sectors);
1703                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
1704                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
1705                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
1706                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
1707                        sector_t, ssize);
1708         }
1709 #endif
1710         if ( nr_sectors < 0 )
1711                 nr_sectors = 0;
1712         if ( nr_sectors < current_count_sectors ){
1713 #if 0
1714                 printk(DEVICE_NAME ": short read got %d instead of %ld\n",
1715                        nr_sectors, current_count_sectors);
1716 #endif
1717 #if 0
1718                 printk("command: ");
1719                 for(i=0; i<raw_cmd.cmd_count; i++)
1720                         printk("%x ", raw_cmd.cmd[i]);
1721                 printk("rate=%x\n", raw_cmd.rate);
1722                 printk("reply: ");
1723                 for(i=0; i< inr; i++)
1724                         printk("%x ", reply_buffer[i]);
1725                 printk("\n");
1726 #endif
1727                 current_count_sectors = nr_sectors;
1728         }
1729 
1730         switch (interpret_errors()){
1731         case 2:
1732                 cont->redo();
1733                 return;
1734         case 1:
1735                 if (  !current_count_sectors){
1736                         cont->error();
1737                         cont->redo();
1738                         return;
1739                 }
1740                 break;
1741         case 0:
1742                 if (  !current_count_sectors){
1743                         int i;
1744                         printk(DEVICE_NAME ": dma problem?\n");
1745                         for(i=0; i< inr ; i++)
1746                                 printk("%2x,", reply_buffer[i]);
1747                         printk("\n");
1748                         bad=1;
1749                         cont->error();
1750                         cont->redo();
1751                         return;
1752                 }
1753                 current_type[current_drive] = floppy;
1754                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1755                         floppy->size >> 1;
1756                 break;
1757         }
1758 
1759         if (probing) {
1760                 if (DP->flags & FTD_MSG)
1761                         printk(DEVICE_NAME
1762                                ": Auto-detected floppy type %s in fd%d\n",
1763                                floppy->name,current_drive);
1764                 current_type[current_drive] = floppy;
1765                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1766                         floppy->size >> 1;
1767                 probing = 0;
1768         }
1769 
1770         if ( COMMAND != FD_READ || current_addr == CURRENT->buffer ){
1771                 /* transfer directly from buffer */
1772                 cont->done(1);
1773         } else if ( COMMAND == FD_READ){
1774                 buffer_track = raw_cmd.track;
1775                 buffer_drive = current_drive;
1776                 if ( nr_sectors + sector_t > buffer_max )
1777                         buffer_max = nr_sectors + sector_t;
1778         }
1779         cont->redo();
1780 }
1781 
1782 /* Compute maximal contiguous buffer size. */
1783 static int buffer_chain_size(void)
     /*  */
1784 {
1785         struct buffer_head *bh;
1786         int size;
1787         char *base;
1788 
1789         base = CURRENT->buffer;
1790         size = CURRENT->current_nr_sectors << 9;
1791         bh = CURRENT->bh;
1792 
1793 #ifdef SANITY
1794         if ( !bh ){
1795                 printk(DEVICE_NAME ": null request in buffer_chain_size\n");
1796                 return size >> 9;
1797         }
1798 #endif
1799 
1800         bh = bh->b_reqnext;
1801         while ( bh && bh->b_data == base + size ){
1802                 size += bh->b_size;
1803                 bh = bh->b_reqnext;
1804         }
1805         return size >> 9;
1806 }
1807 
1808 /* Compute the maximal transfer size */
1809 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
1810 {
1811         if ( max_sector > sector_t + max_size)
1812                 max_sector = sector_t + max_size;
1813 
1814         /* alignment */
1815         max_sector -= (max_sector % floppy->sect ) % ssize;
1816 
1817         /* transfer size, beginning not aligned */
1818         current_count_sectors = max_sector - sector_t ;
1819 
1820         return max_sector;
1821 }
1822 
1823 /*
1824  * Move data from/to the track buffer to/from the buffer cache.
1825  */
1826 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
1827 {
1828         int remaining; /* number of transferred 512-byte sectors */
1829         struct buffer_head *bh;
1830         char *buffer, *dma_buffer;
1831         int size;
1832 
1833         if ( max_sector > max_sector_2 )
1834                 max_sector = max_sector_2;
1835 
1836         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
1837 
1838         if (current_count_sectors <= 0 && COMMAND == FD_WRITE &&
1839             buffer_max > sector_t + CURRENT->nr_sectors){
1840                 current_count_sectors = buffer_max - sector_t;
1841                 if ( current_count_sectors > CURRENT->nr_sectors )
1842                         current_count_sectors = CURRENT->nr_sectors;
1843         }
1844         remaining = current_count_sectors << 9;
1845 #ifdef SANITY
1846         if ((remaining >> 9) > CURRENT->nr_sectors  && COMMAND == 0xc5 ){
1847                 printk(DEVICE_NAME ": in copy buffer\n");
1848                 printk("current_count_sectors=%ld\n", current_count_sectors);
1849                 printk("remaining=%d\n", remaining >> 9);
1850                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
1851                 printk("CURRENT->current_nr_sectors=%ld\n",
1852                        CURRENT->current_nr_sectors);
1853                 printk("max_sector=%d\n", max_sector);
1854                 printk("ssize=%d\n", ssize);
1855         }
1856 #endif
1857 
1858         if ( max_sector > buffer_max )
1859                 buffer_max = max_sector;
1860 
1861         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
1862 
1863         bh = CURRENT->bh;
1864         size = CURRENT->current_nr_sectors << 9;
1865         buffer = CURRENT->buffer;
1866 
1867         while ( remaining > 0){
1868                 if ( size > remaining )
1869                         size = remaining;
1870 #ifdef SANITY
1871                 if (!bh){
1872                         printk(DEVICE_NAME
1873                                ": bh=null in copy buffer before copy\n");
1874                         break;
1875                 }
1876                 if (dma_buffer + size >
1877                     floppy_track_buffer + ( 2 * MAX_BUFFER_SECTORS << 9 ) ||
1878                     dma_buffer < floppy_track_buffer ){
1879                         printk(DEVICE_NAME
1880                                ": buffer overrun in copy buffer %d\n",
1881                                (floppy_track_buffer - dma_buffer) >>9);
1882                         printk("sector_t=%d buffer_min=%d\n",
1883                                sector_t, buffer_min);
1884                         printk("current_count_sectors=%ld\n",
1885                                current_count_sectors);
1886                         if ( COMMAND == FD_READ )
1887                                 printk("read\n");
1888                         if ( COMMAND == FD_READ )
1889                                 printk("write\n");
1890                         break;
1891                 }
1892                 if ( ((int)buffer) % 512 )
1893                         printk(DEVICE_NAME ": %p buffer not aligned\n", buffer);
1894 #endif
1895                 if ( COMMAND == FD_READ )
1896                         memcpy( buffer, dma_buffer, size);
1897                 else
1898                         memcpy( dma_buffer, buffer, size);
1899                 remaining -= size;
1900                 if ( !remaining)
1901                         break;
1902 
1903                 dma_buffer += size;
1904                 bh = bh->b_reqnext;
1905 #ifdef SANITY
1906                 if ( !bh){
1907                         printk(DEVICE_NAME
1908                                ": bh=null in copy buffer after copy\n");
1909                         break;
1910                 }
1911 #endif
1912                 size = bh->b_size;
1913                 buffer = bh->b_data;
1914         }
1915 #ifdef SANITY
1916         if ( remaining ){
1917                 if ( remaining > 0 )
1918                         max_sector -= remaining >> 9;
1919                 printk(DEVICE_NAME
1920                        ": weirdness: remaining %d\n", remaining>>9);
1921         }
1922 #endif
1923 }
1924 
1925 /*
1926  * Formulate a read/write request.
1927  * this routine decides where to load the data (directly to buffer, or to
1928  * tmp floppy area), how much data to load (the size of the buffer, the whole
1929  * track, or a single sector)
1930  * All floppy_track_buffer handling goes in here. If we ever add track buffer
1931  * allocation on the fly, it should be done here. No other part should need
1932  * modification.
1933  */
1934 
1935 static int make_raw_rw_request(void)
     /*  */
1936 {
1937         int aligned_sector_t;
1938         int max_sector, max_size, tracksize, ssize;
1939 
1940         current_drive = DRIVE(CURRENT->dev);
1941 
1942         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
1943                 FD_RAW_NEED_SEEK;
1944         raw_cmd.cmd_count = NR_RW;
1945         if (CURRENT->cmd == READ){
1946                 raw_cmd.flags |= FD_RAW_READ;
1947                 COMMAND = FD_READ;
1948         } else if (CURRENT->cmd == WRITE){
1949                 raw_cmd.flags |= FD_RAW_WRITE;
1950                 COMMAND = FD_WRITE;
1951         } else {
1952                 printk(DEVICE_NAME
1953                        ": make_raw_rw_request: unknown command\n");
1954                 return 0;
1955         }
1956 
1957         max_sector = floppy->sect * floppy->head;
1958         TRACK = CURRENT->sector / max_sector;
1959         sector_t = CURRENT->sector % max_sector;
1960         if ( floppy->track && TRACK >= floppy->track )
1961                 return 0;
1962         HEAD = sector_t / floppy->sect;
1963 
1964         if ( (DRS->flags & FD_NEED_TWADDLE) && sector_t < floppy->sect )
1965                 max_sector = floppy->sect;
1966 
1967         /* 2M disks have phantom sectors on the first track */
1968         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
1969                 max_sector = 2 * floppy->sect / 3;
1970                 if (sector_t >= max_sector){
1971                         current_count_sectors =  (floppy->sect - sector_t);
1972                         if ( current_count_sectors > CURRENT->nr_sectors )
1973                                 current_count_sectors = CURRENT->nr_sectors;
1974                         return 1;
1975                 }
1976                 SIZECODE = 2;
1977         } else
1978                 SIZECODE = FD_SIZECODE(floppy);
1979         raw_cmd.rate = floppy->rate & 3;
1980         if ((floppy->rate & FD_2M) &&
1981             (TRACK || HEAD ) &&
1982             raw_cmd.rate == 2)
1983                 raw_cmd.rate = 1;
1984 
1985         SIZECODE2 = 0xff;
1986         raw_cmd.track = TRACK << floppy->stretch;
1987         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
1988         GAP = floppy->gap;
1989         ssize = 1 << (SIZECODE - 2 );
1990         SECT_PER_TRACK = floppy->sect / ssize;
1991         SECTOR = (sector_t % floppy->sect) / ssize + 1;
1992         tracksize = floppy->sect - floppy->sect % ssize;
1993         if ( tracksize < floppy->sect ){
1994                 SECT_PER_TRACK ++;
1995                 if (  tracksize <= sector_t % floppy->sect)
1996                         SECTOR--;
1997                 while ( tracksize <= sector_t % floppy->sect){
1998                         while( tracksize + ssize > floppy->sect ){
1999                                 SIZECODE--;
2000                                 ssize >>= 1;
2001                         }
2002                         SECTOR++; SECT_PER_TRACK ++;
2003                         tracksize += ssize;
2004                 }
2005                 max_sector = HEAD * floppy->sect + tracksize;
2006         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2007                 max_sector = floppy->sect;
2008 
2009         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2010         max_size = CURRENT->nr_sectors;
2011         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2012             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2013                 /* data already in track buffer */
2014                 if (COMMAND == FD_READ) {
2015                         copy_buffer(1, max_sector, buffer_max);
2016                         return 1;
2017                 }
2018         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2019                 if (COMMAND == FD_WRITE){
2020                         if(sector_t + CURRENT->nr_sectors > ssize &&
2021                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2022                                 max_size = ssize + ssize;
2023                         else
2024                                 max_size = ssize;
2025                 }
2026                 raw_cmd.flags &= ~FD_RAW_WRITE;
2027                 raw_cmd.flags |= FD_RAW_READ;
2028                 COMMAND = FD_READ;
2029         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2030                 int direct, indirect;
2031 
2032                 indirect= transfer_size(ssize,max_sector,MAX_BUFFER_SECTORS*2) -
2033                         sector_t;
2034 
2035                 max_size = buffer_chain_size();
2036                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2037                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2038                 /* 64 kb boundaries */
2039                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2040                      ((long) CURRENT->buffer ) / K_64 )
2041                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2042                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2043                 /*
2044                  * We try to read tracks, but if we get too many errors, we
2045                  * go back to reading just one sector at a time.
2046                  *
2047                  * This means we should be able to read a sector even if there
2048                  * are other bad sectors on this track.
2049                  */
2050                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2051                     *errors < DP->max_errors.read_track &&
2052                     /*!(DRS->flags & FD_NEED_TWADDLE) &&*/
2053                     ( ( !probing || (DP->read_track &
2054                            (1 <<DRS->probed_format))))){
2055                         max_size = CURRENT->nr_sectors;
2056                 } else {
2057                         current_addr = CURRENT->buffer;
2058                         raw_cmd.length = current_count_sectors << 9;
2059                         return 2;
2060                 }
2061         }
2062 
2063         if ( COMMAND == FD_READ )
2064                 max_size = max_sector; /* unbounded */
2065 
2066         /* claim buffer track if needed */
2067         if (buffer_track != raw_cmd.track ||  /* bad track */
2068             buffer_drive !=current_drive || /* bad drive */
2069             sector_t < buffer_min ||
2070             ((COMMAND == FD_READ ||
2071               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2072              max_sector > 2 * MAX_BUFFER_SECTORS + buffer_min &&
2073              max_size + sector_t > 2 * MAX_BUFFER_SECTORS + buffer_min)
2074             /* not enough space */ ){
2075                 buffer_track = -1;
2076                 buffer_drive = current_drive;
2077                 buffer_max = buffer_min = aligned_sector_t;
2078         }
2079         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2080 
2081         if ( COMMAND == FD_WRITE ){
2082                 /* copy write buffer to track buffer.
2083                  * if we get here, we know that the write
2084                  * is either aligned or the data already in the buffer
2085                  * (buffer will be overwritten) */
2086 #ifdef SANITY
2087                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2088                         printk(DEVICE_NAME
2089                                ": internal error offset !=0 on write\n");
2090 #endif
2091                 buffer_track = raw_cmd.track;
2092                 buffer_drive = current_drive;
2093                 copy_buffer(ssize, max_sector, 2*MAX_BUFFER_SECTORS+buffer_min);
2094         } else
2095                 transfer_size(ssize, max_sector,
2096                               2*MAX_BUFFER_SECTORS+buffer_min-aligned_sector_t);
2097 
2098         /* round up current_count_sectors to get dma xfer size */
2099         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2100         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2101         raw_cmd.length <<= 9;
2102 #ifdef SANITY
2103         if ((raw_cmd.length < current_count_sectors << 9) ||
2104             (current_addr != CURRENT->buffer && COMMAND == FD_WRITE &&
2105              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2106               aligned_sector_t < buffer_min )) ||
2107             raw_cmd.length % ( 512 << ( SIZECODE -2 )) ||
2108             raw_cmd.length <= 0 || current_count_sectors <= 0){
2109                 printk(DEVICE_NAME ": fractionary current count b=%lx s=%lx\n",
2110                        raw_cmd.length, current_count_sectors);
2111                 if ( current_addr != CURRENT->buffer )
2112                         printk("addr=%d, length=%ld\n",
2113                                (current_addr - floppy_track_buffer ) >> 9,
2114                                current_count_sectors);
2115                 printk("st=%d ast=%d mse=%d msi=%d\n",
2116                        sector_t, aligned_sector_t, max_sector, max_size);
2117                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2118                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2119                        COMMAND, SECTOR, HEAD, TRACK);
2120                 printk("buffer drive=%d\n", buffer_drive);
2121                 printk("buffer track=%d\n", buffer_track);
2122                 printk("buffer_min=%d\n", buffer_min );
2123                 printk("buffer_max=%d\n", buffer_max );
2124                 return 0;
2125         }
2126 
2127         if (current_addr != CURRENT->buffer ){
2128                 if (current_addr < floppy_track_buffer ||
2129                     current_count_sectors < 0 ||
2130                     raw_cmd.length < 0 ||
2131                     current_addr + raw_cmd.length >
2132                     floppy_track_buffer + ( 2 * MAX_BUFFER_SECTORS  << 9 )){
2133                         printk(DEVICE_NAME
2134                                ": buffer overrun in schedule dma\n");
2135                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2136                                sector_t, buffer_min,
2137                                raw_cmd.length >> 9 );
2138                         printk("current_count_sectors=%ld\n",
2139                                current_count_sectors);
2140                         if ( COMMAND == FD_READ )
2141                                 printk("read\n");
2142                         if ( COMMAND == FD_READ )
2143                                 printk("write\n");
2144                         return 0;
2145                 }
2146         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2147                    current_count_sectors > CURRENT->nr_sectors){
2148                 printk(DEVICE_NAME ": buffer overrun in direct transfer\n");
2149                 return 0;
2150         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2151                 printk(DEVICE_NAME ": more sectors than bytes\n");
2152                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2153                 printk("sectors=%ld\n", current_count_sectors);
2154         }
2155 #endif
2156         return 2;
2157 }
2158 
2159 static void redo_fd_request(void)
     /*  */
2160 {
2161 #define REPEAT {request_done(0); continue; }
2162         int device;
2163         int tmp;
2164 
2165         if (CURRENT && CURRENT->dev < 0) return;
2166         
2167         /* hooray, the goto is gone! */
2168         while(1){
2169                 if (!CURRENT) {
2170                         CLEAR_INTR;
2171                         unlock_fdc();
2172                         return;
2173                 }
2174                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2175                         panic(DEVICE_NAME ": request list destroyed");
2176                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2177                         panic(DEVICE_NAME ": block not locked");
2178                 
2179                 device = MINOR(CURRENT->dev);
2180                 set_fdc( DRIVE(device));
2181                 CHECK_RESET;
2182                 start_motor();
2183                 if (( changed_floppies | fake_change) & ( 1 << DRIVE(device))){
2184                         printk(DEVICE_NAME
2185                                ": disk absent or changed during operation\n");
2186                         REPEAT;
2187                 }
2188                 set_floppy(device);
2189                 if (!floppy) { /* Autodetection */
2190                         if (!probing){
2191                                 DRS->probed_format = 0;
2192                                 if ( next_valid_format() ){
2193                                         printk(DEVICE_NAME
2194                                                ": no autodetectable formats\n");
2195                                         floppy = NULL;
2196                                         REPEAT;
2197                                 }
2198                         }
2199                         probing = 1;
2200                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2201                 } else
2202                         probing = 0;
2203                 errors = & (CURRENT->errors);
2204                 tmp = make_raw_rw_request();
2205                 if ( tmp < 2 ){
2206                         request_done(tmp);
2207                         continue;
2208                 }
2209                 if ( DRS->flags & FD_NEED_TWADDLE )
2210                         twaddle();
2211                 floppy_on(current_drive);
2212 #ifdef DEBUGT
2213                 debugt("queue fd request");
2214 #endif
2215                 return;
2216         }
2217 #undef REPEAT
2218 }
2219 
2220 static struct cont_t rw_cont={
2221         rw_interrupt,
2222         redo_fd_request,
2223         bad_flp_intr,
2224         request_done };
2225 
2226 void do_fd_request(void)
     /*  */
2227 {
2228         lock_fdc(-1);
2229         cont = &rw_cont;
2230         redo_fd_request();
2231 }
2232 
2233 /*
2234  * User triggered reset
2235  * ====================
2236  */
2237 
2238 static void reset_intr(void)
     /*  */
2239 {
2240         printk("weird, reset interrupt called\n");
2241 }
2242 
2243 static struct cont_t reset_cont={
2244         reset_intr,
2245         success_and_wakeup,
2246         generic_failure,
2247         generic_done };
2248 
2249 static int user_reset_fdc(int drive, int arg)
     /*  */
2250 {
2251         int result;
2252 
2253         result=0;
2254         lock_fdc(drive);
2255         switch(arg){
2256         case FD_RESET_ALWAYS:
2257                 FDCS->reset=1;
2258                 break;
2259         case FD_RESET_IF_RAWCMD:
2260                 if(FDCS->rawcmd == 2 )
2261                         reset_fdc_info(1);
2262                 break;
2263         }
2264         if ( FDCS->reset ){
2265                 cont = &reset_cont;
2266                 timer_table[FLOPPY_TIMER].expires = jiffies + 5;
2267                 timer_active |= 1 << FLOPPY_TIMER;
2268                 reset_fdc();
2269                 result=wait_til_done();
2270         }
2271         unlock_fdc();
2272         return result;
2273 }
2274 
2275 /*
2276  * Misc Ioctl's and support
2277  * ========================
2278  */
2279 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2280 {
2281         int i;
2282 
2283         i = verify_area(VERIFY_WRITE,param,size);
2284         if (i)
2285                 return i;
2286         memcpy_tofs(param,(void *) address, size);
2287         return 0;
2288 }
2289 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2290 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2291 
2292 static void poll_drive(int drive)
     /*  */
2293 {
2294         lock_fdc(drive);
2295         start_motor();
2296         unlock_fdc();
2297 }
2298 
2299 static char *drive_name(int type, int drive )
     /*  */
2300 {
2301         struct floppy_struct *floppy;   
2302 
2303         if ( type )
2304                 floppy = floppy_type + type;
2305         else {
2306                 if ( UDP->native_format )
2307                         floppy = floppy_type + UDP->native_format;
2308                 else
2309                         return "(null)";
2310         }
2311         if ( floppy->name )
2312                 return floppy->name;
2313         else
2314                 return "(null)";
2315 }
2316 
2317 /* raw commands */
2318 static struct cont_t raw_cmd_cont={
2319         success_and_wakeup,
2320         failure_and_wakeup,
2321         generic_failure,
2322         generic_done };
2323 
2324 static int raw_cmd_ioctl(int drive, void *param)
     /*  */
2325 {
2326         int i, count, ret;
2327 
2328         if ( FDCS->rawcmd <= 1 )
2329                 FDCS->rawcmd = 1;
2330         for ( i= 0; i < N_DRIVE; i++){
2331                 if ( FDC(i) != fdc)
2332                         continue;
2333                 if ( i == drive ){
2334                         if ( drive_state[i].fd_ref > 1 )
2335                                 return -EBUSY;
2336                 } else if ( drive_state[i].fd_ref )
2337                         return -EBUSY;
2338         }
2339 
2340         if(FDCS->reset)
2341                 return -EIO;
2342 
2343         COPYIN(raw_cmd);
2344         raw_cmd.rate &= 0x03;   
2345         count = raw_cmd.length;
2346         if ((raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)) &&
2347             count > MAX_BUFFER_SECTORS * 512 * 2 )
2348                 return -ENOMEM;
2349 
2350         if ( raw_cmd.flags & FD_RAW_WRITE ){
2351                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2352                 if (i)
2353                         return i;
2354                 buffer_track = -1;
2355                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2356         }
2357 
2358         current_addr = floppy_track_buffer;
2359         raw_cmd.flags |= FD_RAW_USER_SUPPLIED;
2360         cont =  &raw_cmd_cont;
2361         floppy_on(current_drive);
2362         ret=wait_til_done();
2363 
2364         if ( !ret && !FDCS->reset ){
2365                 raw_cmd.reply_count = inr;
2366                 for( i=0; i< raw_cmd.reply_count; i++)
2367                         raw_cmd.reply[i] = reply_buffer[i];
2368                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2369                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2370         } else
2371                 ret = -EIO;
2372         DRS->track = NO_TRACK;
2373         if ( ret )
2374                 return ret;
2375 
2376         if ( raw_cmd.flags & FD_RAW_READ ){
2377                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2378                 if (i)
2379                         return i;
2380         }
2381 
2382         return COPYOUT(raw_cmd);
2383 }
2384 
2385 static int invalidate_drive(int rdev)
     /*  */
2386 {
2387         /* invalidate the buffer track to force a reread */
2388         cli();
2389         fake_change |= 1 << DRIVE(rdev);
2390         sti();
2391         unlock_fdc();
2392         check_disk_change(rdev);
2393         return 0;
2394 }
2395 
2396 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2397     unsigned long param)
2398 {
2399 #define IOCTL_MODE_BIT 8
2400 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2401 
2402         struct floppy_struct newparams;
2403         struct format_descr tmp_format_req;
2404         int i,device,drive,type,cnt;
2405         struct floppy_struct *this_floppy;
2406         char *name;
2407 
2408         device = MINOR(inode->i_rdev);
2409         switch (cmd) {
2410                 RO_IOCTLS(device,param);
2411         }
2412         type = TYPE(MINOR(device));
2413         drive = DRIVE(MINOR(device));
2414         switch (cmd) {
2415         case FDGETDRVTYP:
2416                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2417                 if (i)
2418                         return i;
2419                 name = drive_name(type,drive);
2420                 for ( cnt=0; cnt<16; cnt++){
2421                         put_fs_byte(name[cnt],
2422                                     ((char*)param)+cnt);
2423                         if ( ! *name )
2424                                 break;
2425                 }
2426                 return 0;
2427         case FDGETMAXERRS:
2428                 return COPYOUT(UDP->max_errors);
2429         case FDGETPRM:
2430                 if (type)
2431                         this_floppy = &floppy_type[type];
2432                 else if ((this_floppy = current_type[drive]) ==
2433                          NULL)
2434                         return -ENODEV;
2435                 return COPYOUT(this_floppy[0]);
2436         case FDPOLLDRVSTAT:
2437                 poll_drive(drive);
2438                 /* fall through */
2439         case FDGETDRVSTAT:
2440                 return COPYOUT(*UDRS);
2441         case FDGETFDCSTAT:
2442                 return COPYOUT(*UFDCS);
2443         case FDGETDRVPRM:
2444                 return COPYOUT(*UDP);
2445         }
2446         if (!IOCTL_ALLOWED)
2447                 return -EPERM;
2448         switch (cmd) {
2449         case FDRAWCMD:
2450                 if (type)
2451                         return -EINVAL;
2452                 lock_fdc(drive);
2453                 set_floppy(device);
2454                 i = raw_cmd_ioctl(drive, (void *) param);
2455                 unlock_fdc();
2456                 return i;
2457         case FDFMTTRK:
2458                 if (UDRS->fd_ref != 1)
2459                         return -EBUSY;
2460                 if (! (UDRS->flags & FD_DRIVE_PRESENT ))
2461                         return -ENXIO;
2462                 COPYIN(tmp_format_req);
2463                 return do_format(device, &tmp_format_req);
2464         case FDSETMAXERRS:
2465                 return COPYIN(UDP->max_errors);
2466         case FDFMTBEG:
2467                 return 0;
2468         case FDCLRPRM:
2469                 lock_fdc(drive);
2470                 current_type[drive] = NULL;
2471                 floppy_sizes[drive] = 2;
2472                 UDRS->keep_data = 0;
2473                 return invalidate_drive(device);
2474         case FDFMTEND:
2475         case FDFLUSH:
2476                 lock_fdc(drive);
2477                 return invalidate_drive(device);
2478         case FDSETPRM:
2479         case FDDEFPRM:
2480                 COPYIN(newparams);
2481                 /* sanity checking for parameters.*/
2482                 if(newparams.sect <= 0 ||
2483                    newparams.head <= 0 ||
2484                    newparams.track <= 0 ||
2485                    newparams.track >
2486                    UDP->tracks>>newparams.stretch)
2487                         return -EINVAL;
2488                 if ( type){
2489                         if ( !suser() )
2490                                 return -EPERM;
2491                         lock_fdc(-1);
2492                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2493                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2494                                     drive_state[cnt].fd_ref){
2495                                         cli(); fake_change |= 1 << cnt; sti();
2496                                 }
2497                         }
2498                         floppy_type[type] = newparams;
2499                         floppy_type[type].name="user format";
2500                         for (cnt = type << 2 ;
2501                              cnt < (type << 2 ) + 4 ;
2502                              cnt++)
2503                                 floppy_sizes[cnt]=
2504 #ifdef HAVE_2_CONTROLLERS
2505                                         floppy_sizes[cnt+0x80]=
2506 #endif
2507                                                 floppy_type[type].size>>1;
2508                         unlock_fdc();
2509                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2510                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2511                                     drive_state[cnt].fd_ref)
2512                                         check_disk_change(drive_state[cnt].
2513                                                           fd_device);
2514                         }
2515                         return 0;
2516                 }
2517 
2518                 lock_fdc(drive);
2519                 if ( cmd != FDDEFPRM )
2520                         /* notice a disk change immediately, else
2521                          * we loose our settings immediately*/
2522                         start_motor();
2523                 user_params[drive] = newparams;
2524                 if (buffer_drive == drive &&
2525                     buffer_max > user_params[drive].sect)
2526                         buffer_max=user_params[drive].sect;
2527                 current_type[drive] = &user_params[drive];
2528                 floppy_sizes[drive] = user_params[drive].size >> 1;
2529                 if (cmd == FDDEFPRM)
2530                         DRS->keep_data = -1;
2531                 else
2532                         DRS->keep_data = 1;
2533                 /* invalidation. Invalidate only when needed, i.e.
2534                  * when there are already sectors in the buffer cache
2535                  * whose number will change. This is useful, because
2536                  * mtools often changes the geometry of the disk after
2537                  * looking at the boot block */
2538                 if (DRS->maxblock >
2539                     user_params[drive].sect ||
2540                     DRS->maxtrack )
2541                         return invalidate_drive(device);
2542                 else
2543                         return unlock_fdc();
2544         case FDRESET:
2545                 return user_reset_fdc( drive, (int)param);
2546         case FDMSGON:
2547                 UDP->flags |= FTD_MSG;
2548                 return 0;
2549         case FDMSGOFF:
2550                 UDP->flags &= ~FTD_MSG;
2551                 return 0;
2552         case FDSETEMSGTRESH:
2553                 UDP->max_errors.reporting =
2554                         (unsigned short) (param & 0x0f);
2555                 return 0;
2556         case FDTWADDLE:
2557                 lock_fdc(drive);
2558                 twaddle();
2559                 unlock_fdc();
2560         }
2561         if ( ! suser() )
2562                 return -EPERM;
2563         switch(cmd){
2564         case FDSETDRVPRM:
2565                 return COPYIN(*UDP);
2566         default:
2567                 return -EINVAL;
2568         }
2569         return 0;
2570 #undef IOCTL_ALLOWED
2571 }
2572 
2573 #define CMOS_READ(addr) ({ \
2574 outb_p(addr,0x70); \
2575 inb_p(0x71); \
2576 })
2577 
2578 static void set_base_type(int drive,int code)
     /*  */
2579 {
2580         if (code > 0 && code <= NUMBER(default_drive_params)) {
2581                 memcpy((char *) UDP,
2582                        (char *) (&default_drive_params[code].params),
2583                        sizeof( struct floppy_drive_params ));
2584                 printk("fd%d is %s", drive, default_drive_params[code].name);
2585                 return;
2586         } else if (!code)
2587                 printk("fd%d is not installed", drive);
2588         else
2589                 printk("fd%d is unknown type %d",drive,code);
2590 }
2591 
2592 static void config_types(void)
     /*  */
2593 {
2594         int drive;
2595 
2596         for (drive=0; drive<N_DRIVE ; drive++){
2597                 /* default type for unidentifiable drives */
2598                 memcpy((char *) UDP, (char *) (&default_drive_params->params),
2599                        sizeof( struct floppy_drive_params ));
2600         }
2601         printk("Floppy drive(s): ");
2602         set_base_type(0, (CMOS_READ(0x10) >> 4) & 15);
2603         if (CMOS_READ(0x10) & 15) {
2604                 printk(", ");
2605                 set_base_type(1, CMOS_READ(0x10) & 15);
2606         }
2607         printk("\n");
2608 }
2609 
2610 
2611 static void maybe_check_change(int device)
     /*  */
2612 {
2613         register int drive;
2614 
2615         drive = DRIVE(device);
2616         if (UDRS->last_checked + UDP->checkfreq < jiffies  ||
2617             UDRS->flags & FD_VERIFY ||
2618             (( changed_floppies | fake_change ) & ( 1 << drive)))
2619                 check_disk_change(device);
2620 }
2621 
2622 int floppy_is_wp( int minor)
     /*  */
2623 {
2624         maybe_check_change(minor + (MAJOR_NR << 8));
2625         return ! ( drive_state[ DRIVE(minor) ].flags & FD_DISK_WRITABLE );
2626 }
2627 
2628 
2629 #define WRAPPER(op) \
2630 static int floppy_##op(struct inode * inode, struct file * filp, \
2631                      char * buf, int count) \
2632 { \
2633         maybe_check_change(inode->i_rdev);      \
2634         if ( changed_floppies & ( 1 << DRIVE(inode->i_rdev) )) \
2635                 return -ENXIO; \
2636         return block_##op(inode, filp, buf, count); \
2637 }
2638 
2639 WRAPPER(read)
2640 WRAPPER(write)
2641 
2642 static int exclusive = 0;
2643 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
2644 {
2645         int drive= DRIVE(inode->i_rdev);
2646 
2647         fsync_dev(inode->i_rdev);
2648         if ( UDRS->fd_ref < 0)
2649                 UDRS->fd_ref=0;
2650         else if (!UDRS->fd_ref--) {
2651                 printk(DEVICE_NAME ": floppy_release with fd_ref == 0");
2652                 UDRS->fd_ref = 0;
2653         }
2654         floppy_release_irq_and_dma();
2655         exclusive=0;
2656 }
2657 
2658 /*
2659  * floppy_open check for aliasing (/dev/fd0 can be the same as
2660  * /dev/PS0 etc), and disallows simultaneous access to the same
2661  * drive with different device numbers.
2662  */
2663 #define RETERR(x) \
2664         do{floppy_release(inode,filp); \
2665            return -(x);}while(0)
2666 static int usage_count = 0;
2667 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2668 {
2669         int drive;
2670         int old_dev;
2671 
2672         if (exclusive)
2673                 return -EBUSY;
2674 
2675         if (!filp) {
2676                 printk(DEVICE_NAME ": Weird, open called with filp=0\n");
2677                 return -EIO;
2678         }
2679 
2680         drive = DRIVE(inode->i_rdev);
2681         if ( drive >= N_DRIVE )
2682                 return -ENXIO;
2683 
2684         if (command_status == FD_COMMAND_DETECT && drive >= current_drive) {
2685                 lock_fdc(-1);
2686                 unlock_fdc();
2687         }
2688 
2689         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
2690                 return -ENXIO;
2691 
2692         if (filp->f_mode & 3) {
2693                 if ( !(UDRS->flags & FD_DRIVE_PRESENT))
2694                         return -ENXIO;
2695         }
2696 
2697         old_dev = UDRS->fd_device;
2698         if (UDRS->fd_ref && old_dev != inode->i_rdev)
2699                 return -EBUSY;
2700 
2701         if (filp->f_flags & O_EXCL) {
2702                 if (usage_count)
2703                         return -EBUSY;
2704                 else
2705                         exclusive = 1;
2706         }
2707 
2708         if (floppy_grab_irq_and_dma())
2709                 return -EBUSY;
2710 
2711         UDRS->fd_ref++;
2712         UDRS->fd_device = inode->i_rdev;
2713 
2714         if (old_dev && old_dev != inode->i_rdev) {
2715                 if (buffer_drive == drive)
2716                         buffer_track = -1;
2717                 invalidate_buffers(old_dev);
2718         }
2719 
2720         /* Allow ioctls if we have write-permissions even if read-only open */
2721         if ((filp->f_mode & 2) || permission(inode,2))
2722                 filp->f_mode |= IOCTL_MODE_BIT;
2723 
2724         if (UFDCS->rawcmd == 1)
2725                UFDCS->rawcmd = 2;
2726 
2727         if (filp->f_flags & O_NDELAY)
2728                 return 0;
2729 
2730         if (filp->f_mode && !(UDRS->flags & FD_DRIVE_PRESENT))
2731                 RETERR(ENXIO);
2732 
2733         if (user_reset_fdc(drive, FD_RESET_IF_NEEDED))
2734                 RETERR(EIO);
2735 
2736         if (filp->f_mode & 3) {
2737                 check_disk_change(inode->i_rdev);
2738                 if (changed_floppies & ( 1 << drive ))
2739                         RETERR(ENXIO);
2740         }
2741         if ((filp->f_mode & 2) && !(UDRS->flags & FD_DISK_WRITABLE))
2742                 RETERR(EROFS);
2743         return 0;
2744 #undef RETERR
2745 }
2746 
2747 /*
2748  * Acknowledge disk change
2749  */
2750 static int ack_change(int drive)
     /*  */
2751 {
2752         unsigned int mask = 1 << drive;
2753         UDRS->maxblock = 0;
2754         UDRS->maxtrack = 0;
2755         if ( buffer_drive == drive )
2756                 buffer_track = -1;
2757         fake_change &= ~mask;
2758         changed_floppies &= ~mask;
2759         return 1;
2760 }
2761 
2762 /*
2763  * Check if the disk has been changed or if a change has been faked.
2764  */
2765 static int check_floppy_change(dev_t dev)
     /*  */
2766 {
2767         int drive = DRIVE( dev );
2768         unsigned int mask = 1 << drive;
2769 
2770         if (MAJOR(dev) != MAJOR_NR) {
2771                 printk(DEVICE_NAME ": floppy_changed: not a floppy\n");
2772                 return 0;
2773         }
2774 
2775         if (fake_change & mask)
2776                 return ack_change(drive);
2777 
2778         if ((UDRS->flags & FD_VERIFY ) || (changed_floppies & mask) ||
2779             UDRS->last_checked + UDP->checkfreq <
2780             jiffies){
2781                 user_reset_fdc(drive, FD_RESET_IF_NEEDED);
2782                 poll_drive(drive);
2783                 if (changed_floppies & mask){
2784                         UDRS->generation++;
2785                         return ack_change(drive);
2786                 }
2787         }
2788         return 0;
2789 }
2790 
2791 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
2792  * the bootblock (block 0) */
2793 static int floppy_revalidate(dev_t dev)
     /*  */
2794 {
2795         struct buffer_head * bh;
2796 
2797         if ( TYPE(dev) || current_type[DRIVE(dev)] )
2798                 return 0;
2799         if (!(bh = getblk(dev,0,1024)))
2800                 return 1;
2801         if ( bh && ! bh->b_uptodate)
2802                 ll_rw_block(READ, 1, &bh);
2803         brelse(bh);
2804         return 0;
2805 }
2806 
2807 static struct file_operations floppy_fops = {
2808         NULL,                   /* lseek - default */
2809         floppy_read,            /* read - general block-dev read */
2810         floppy_write,           /* write - general block-dev write */
2811         NULL,                   /* readdir - bad */
2812         NULL,                   /* select */
2813         fd_ioctl,               /* ioctl */
2814         NULL,                   /* mmap */
2815         floppy_open,            /* open */
2816         floppy_release,         /* release */
2817         block_fsync,            /* fsync */
2818         NULL,                   /* fasync */
2819         check_floppy_change,    /* media_change */
2820         floppy_revalidate,      /* revalidate */
2821 };
2822 
2823 /*
2824  * Floppy Driver initialisation
2825  * =============================
2826  */
2827 
2828 /* Determine the floppy disk controller type */
2829 /* This routine was written by David C. Niemi */
2830 static char get_fdc_version(void)
     /*  */
2831 {
2832         int r;
2833 
2834         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
2835         if ( FDCS->reset )
2836                 return FDC_NONE;
2837         if ( (r = result()) <= 0x00)
2838                 return FDC_NONE;        /* No FDC present ??? */
2839         if ((r==1) && (reply_buffer[0] == 0x80)){
2840                 printk("FDC %d is a 8272A\n",fdc);
2841                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
2842         }
2843         if (r != 10) {
2844                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
2845                 return FDC_UNKNOWN;
2846         }
2847         output_byte(FD_VERSION);
2848         r = result();
2849         if ((r == 1) && (reply_buffer[0] == 0x80)){
2850                 printk("FDC %d is a 82072\n",fdc);
2851                 return FDC_82072;               /* 82072 doesn't know VERSION */
2852         }
2853         if ((r != 1) || (reply_buffer[0] != 0x90)) {
2854                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
2855                 return FDC_UNKNOWN;
2856         }
2857         output_byte(FD_UNLOCK);
2858         r = result();
2859         if ((r == 1) && (reply_buffer[0] == 0x80)){
2860                 printk("FDC %d is a pre-1991 82077\n", fdc);
2861                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
2862         }
2863         if ((r != 1) || (reply_buffer[0] != 0x00)) {
2864                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
2865                 return FDC_UNKNOWN;
2866         }
2867         printk("FDC %d is a post-1991 82077\n",fdc);
2868         return FDC_82077;       /* Revised 82077AA passes all the tests */
2869 } /* fdc_init */
2870 
2871 /*
2872  * Drive detection routine. This runs in the background while the kernel
2873  * does other (non floppy related) initialisation work.
2874  */
2875 static void detect_interrupt(void)
     /*  */
2876 {
2877         if ( DRS->track == 0 )
2878                 DRS->flags |= FD_DRIVE_PRESENT | FD_VERIFY;
2879         else if ( DRS->track != NEED_1_RECAL ){
2880                 floppy_ready();
2881                 return;
2882         }
2883         floppy_off(current_drive);
2884         current_drive++;
2885         if (current_drive == N_DRIVE ||
2886             fdc_state[FDC(current_drive)].version == FDC_NONE){
2887                 set_fdc(0);
2888                 unlock_fdc();
2889                 floppy_release_irq_and_dma();
2890                 return;
2891         }
2892         set_fdc(current_drive);
2893         floppy_ready(); /* next */
2894 }
2895 
2896 static struct cont_t detect_cont={
2897         detect_interrupt,
2898         detect_interrupt,
2899         empty,
2900         (done_f) empty };
2901 
2902 void floppy_init(void)
     /*  */
2903 {
2904         int i;
2905 
2906         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
2907                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
2908                 return;
2909         }
2910 
2911         for(i=0; i<256; i++)
2912                 if ( TYPE(i))
2913                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
2914                 else
2915                         floppy_sizes[i] = MAX_DISK_SIZE;
2916 
2917         blk_size[MAJOR_NR] = floppy_sizes;
2918         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
2919         timer_table[FLOPPY_TIMER].fn = floppy_shutdown;
2920         timer_active &= ~(1 << FLOPPY_TIMER);
2921         config_types();
2922 
2923         fdc_state[0].address = 0x3f0;
2924 #if N_FDC > 1
2925         fdc_state[1].address = 0x370;
2926 #endif
2927         for (i = 0 ; i < N_FDC ; i++) {
2928                 fdc = i;
2929                 FDCS->dtr = -1;
2930                 FDCS->dor = 0;
2931                 FDCS->reset = 0;
2932                 FDCS->version = FDC_NONE;
2933                 set_dor(fdc, ~0, 0xc );
2934         }
2935 
2936         /* initialise drive state */
2937         for (i = 0; i < N_DRIVE ; i++) {
2938                 current_drive = i;
2939                 DRS->flags = FD_VERIFY;
2940                 DRS->generation = 0;
2941                 DRS->keep_data = 0;
2942                 DRS->fd_ref = 0;
2943                 DRS->fd_device = 0;
2944         }
2945 
2946         floppy_grab_irq_and_dma();
2947         for (i = 0 ; i < N_FDC ; i++) {
2948                 fdc = i;
2949                 FDCS->rawcmd = 2;
2950                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED))
2951                         continue;
2952                 /* Try to determine the floppy controller type */
2953                 FDCS->version = get_fdc_version();
2954                 if (FDCS->version == FDC_NONE)
2955                         continue;
2956 
2957                 /* Not all FDCs seem to be able to handle the version command
2958                  * properly, so force a reset for the standard FDC clones,
2959                  * to avoid interrupt garbage.
2960                  */
2961                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
2962                 user_reset_fdc(-1,FD_RESET_ALWAYS);
2963         }
2964         fdc=0;
2965         current_drive = 0;
2966         lock_fdc(-1);
2967         initialising =0;
2968         command_status = FD_COMMAND_DETECT;
2969         cont = &detect_cont;
2970         raw_cmd.cmd_count = 0;
2971         raw_cmd.flags = FD_RAW_NEED_SEEK;
2972         raw_cmd.track = 0;
2973         floppy_ready();
2974         cli();
2975 }
2976 
2977 int floppy_grab_irq_and_dma(void)
     /*  */
2978 {
2979         if (usage_count++)
2980                 return 0;
2981         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
2982                 printk(DEVICE_NAME
2983                        ": Unable to grab IRQ%d for the floppy driver\n",
2984                        FLOPPY_IRQ);
2985                 return -1;
2986         }
2987         if (request_dma(FLOPPY_DMA,"floppy")) {
2988                 printk(DEVICE_NAME
2989                        ": Unable to grab DMA%d for the floppy driver\n",
2990                        FLOPPY_DMA);
2991                 free_irq(FLOPPY_IRQ);
2992                 return -1;
2993         }
2994         enable_irq(FLOPPY_IRQ);
2995         return 0;
2996 }
2997 
2998 void floppy_release_irq_and_dma(void)
     /*  */
2999 {
3000         if (--usage_count)
3001                 return;
3002         disable_dma(FLOPPY_DMA);
3003         free_dma(FLOPPY_DMA);
3004         disable_irq(FLOPPY_IRQ);
3005         free_irq(FLOPPY_IRQ);
3006 #ifdef HAVE_2_CONTROLLERS
3007         /* switch on first controller.
3008          * This saves us trouble on the next reboot. */
3009         set_dor(0, ~0, 8 );
3010         set_dor(1, ~8, 0 );
3011 #endif
3012 }
/* */
root/drivers/block/floppy.c

DEFINITIONS
