drivers/block/floppy.c

/* */
This source file includes following definitions.
set_debugt
debugt
disk_change
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
check_wp
seek_floppy
recal_interrupt
unexpected_floppy_interrupt
floppy_interrupt
recalibrate_floppy
reset_interrupt
reset_fdc
empty
show_floppy
floppy_shutdown
start_motor
floppy_ready
floppy_start
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
drive_name
raw_cmd_ioctl
invalidate_drive
fd_ioctl
set_base_type
config_types
floppy_is_wp
WRAPPER
floppy_open
check_floppy_change
floppy_revalidate
get_fdc_version
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 /* the following is the mask of allowed drives. By default units 2 and
  13  * 3 of both floppy controllers are disabled, because switching on the
  14  * motor of these drives causes system hangs on some PCI computers. drive
  15  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
  16  * a drive is allowed. */
  17 
  18 #define ALLOWED_DRIVE_MASK 0x33
  19 
  20 
  21 /* Undefine the following if you have to floppy disk controllers:
  22  * This works at least for me; if you get two controllers working, with
  23  * drives attached to both, please mail me: Alain.Knaff@imag.fr */
  24 /* #define HAVE_2_CONTROLLERS */
  25 
  26 
  27 /* Define the following if you don't like that your drives seek audibly
  28  * after a disk change (but it may not work correctly for everybody)
  29  */
  30 /* #define SILENT_DC_CLEAR */
  31 
  32 
  33 /* End of configuration */
  34 
  35 /*
  36  * 02.12.91 - Changed to static variables to indicate need for reset
  37  * and recalibrate. This makes some things easier (output_byte reset
  38  * checking etc), and means less interrupt jumping in case of errors,
  39  * so the code is hopefully easier to understand.
  40  */
  41 
  42 /*
  43  * This file is certainly a mess. I've tried my best to get it working,
  44  * but I don't like programming floppies, and I have only one anyway.
  45  * Urgel. I should check for more errors, and do more graceful error
  46  * recovery. Seems there are problems with several drives. I've tried to
  47  * correct them. No promises.
  48  */
  49 
  50 /*
  51  * As with hd.c, all routines within this file can (and will) be called
  52  * by interrupts, so extreme caution is needed. A hardware interrupt
  53  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  54  * call "floppy-on" directly, but have to set a special timer interrupt
  55  * etc.
  56  */
  57 
  58 /*
  59  * 28.02.92 - made track-buffering routines, based on the routines written
  60  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  61  */
  62 
  63 /*
  64  * Automatic floppy-detection and formatting written by Werner Almesberger
  65  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  66  * the floppy-change signal detection.
  67  */
  68 
  69 /*
  70  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  71  * FDC data overrun bug, added some preliminary stuff for vertical
  72  * recording support.
  73  *
  74  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  75  *
  76  * TODO: Errors are still not counted properly.
  77  */
  78 
  79 /* 1992/9/20
  80  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  81  * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
  82  * Christoph H. Hochst\"atter.
  83  * I have fixed the shift values to the ones I always use. Maybe a new
  84  * ioctl() should be created to be able to modify them.
  85  * There is a bug in the driver that makes it impossible to format a
  86  * floppy as the first thing after bootup.
  87  */
  88 
  89 /*
  90  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  91  * this helped the floppy driver as well. Much cleaner, and still seems to
  92  * work.
  93  */
  94 
  95 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  96  * minor modifications to allow 2.88 floppies to be run.
  97  */
  98 
  99 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
 100  * disk types.
 101  */
 102 
 103 /*
 104  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
 105  * format bug fixes, but unfortunately some new bugs too...
 106  */
 107 
 108 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 
 109  * errors to allow safe writing by specialized programs.
 110  */
 111 
 112 #define REALLY_SLOW_IO
 113 #define FLOPPY_IRQ 6
 114 #define FLOPPY_DMA 2
 115 
 116 #define DEBUGT 2
 117 
 118 #include <linux/config.h>
 119 #include <linux/sched.h>
 120 #include <linux/fs.h>
 121 #include <linux/kernel.h>
 122 #include <linux/timer.h>
 123 #include <linux/tqueue.h>
 124 #define FDPATCHES
 125 #include <linux/fdreg.h>
 126 #include <linux/fd.h>
 127 #include <linux/errno.h>
 128 #include <linux/malloc.h>
 129 #include <linux/string.h>
 130 #include <linux/fcntl.h>
 131 #include <linux/delay.h>
 132 
 133 #include <asm/dma.h>
 134 #include <asm/irq.h>
 135 #include <asm/system.h>
 136 #include <asm/io.h>
 137 #include <asm/segment.h>
 138 
 139 #define MAJOR_NR FLOPPY_MAJOR
 140 #include "blk.h"
 141 
 142 static unsigned int changed_floppies = 0xff, fake_change = 0;
 143 static int initialising=1;
 144 
 145 
 146 #ifdef HAVE_2_CONTROLLERS
 147 #define N_FDC 2
 148 #define N_DRIVE 8
 149 #else
 150 #define N_FDC 1
 151 #define N_DRIVE 4
 152 #endif
 153 
 154 #define TYPE(x) ( ((x)>>2) & 0x1f )
 155 #define DRIVE(x) ( ((x)&0x03) | (((x)&0x80 ) >> 5))
 156 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 157 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 158 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 159                                 /* reverse mapping from unit and fdc to drive */
 160 #define DP (&drive_params[current_drive])
 161 #define DRS (&drive_state[current_drive])
 162 #define DRWE (&write_errors[current_drive])
 163 #define FDCS (&fdc_state[fdc])
 164 
 165 #define UDP (&drive_params[drive])
 166 #define UDRS (&drive_state[drive])
 167 #define UDRWE (&write_errors[drive])
 168 #define UFDCS (&fdc_state[FDC(drive)])
 169 
 170 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive);
 171 
 172 #define DPRINT1(x,x1) \
 173 printk(DEVICE_NAME "%d: " x,current_drive,(x1));
 174 
 175 #define DPRINT2(x,x1,x2) \
 176 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2));
 177 
 178 #define DPRINT3(x,x1,x2,x3) \
 179 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3));
 180 
 181 /* read/write */
 182 #define COMMAND raw_cmd.cmd[0]
 183 #define DR_SELECT raw_cmd.cmd[1]
 184 #define TRACK raw_cmd.cmd[2]
 185 #define HEAD raw_cmd.cmd[3]
 186 #define SECTOR raw_cmd.cmd[4]
 187 #define SIZECODE raw_cmd.cmd[5]
 188 #define SECT_PER_TRACK raw_cmd.cmd[6]
 189 #define GAP raw_cmd.cmd[7]
 190 #define SIZECODE2 raw_cmd.cmd[8]
 191 #define NR_RW 9
 192 
 193 /* format */
 194 #define F_SIZECODE raw_cmd.cmd[2]
 195 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 196 #define F_GAP raw_cmd.cmd[4]
 197 #define F_FILL raw_cmd.cmd[5]
 198 #define NR_F 6
 199 
 200 /*
 201  * Maximum disk size (in kilobytes). This default is used whenever the
 202  * current disk size is unknown.
 203  */
 204 #define MAX_DISK_SIZE 3984
 205 
 206 
 207 
 208 /*
 209  * The DMA channel used by the floppy controller cannot access data at
 210  * addresses >= 16MB
 211  *
 212  * Went back to the 1MB limit, as some people had problems with the floppy
 213  * driver otherwise. It doesn't matter much for performance anyway, as most
 214  * floppy accesses go through the track buffer.
 215  */
 216 #define LAST_DMA_ADDR   (0x1000000)
 217 #define K_64 (0x10000) /* 64 k */
 218 
 219 /*
 220  * globals used by 'result()'
 221  */
 222 #define MAX_REPLIES 10
 223 static unsigned char reply_buffer[MAX_REPLIES];
 224 static int inr; /* size of reply buffer, when called from interrupt */
 225 #define ST0 (reply_buffer[0])
 226 #define ST1 (reply_buffer[1])
 227 #define ST2 (reply_buffer[2])
 228 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 229 #define R_TRACK (reply_buffer[3])
 230 #define R_HEAD (reply_buffer[4])
 231 #define R_SECTOR (reply_buffer[5])
 232 #define R_SIZECODE (reply_buffer[6])
 233 
 234 /*
 235  * this struct defines the different floppy drive types.
 236  */
 237 static struct {
 238         struct floppy_drive_params params;
 239         char *name; /* name printed while booting */
 240 } default_drive_params[]= {
 241 /* NOTE: the time values in jiffies should be in msec!
 242  CMOS drive type
 243   |     Maximum data rate supported by drive type
 244   |     |   Head load time, msec
 245   |     |   |   Head unload time, msec (not used)
 246   |     |   |   |     Step rate interval, usec
 247   |     |   |   |     |    Time needed for spinup time (jiffies)
 248   |     |   |   |     |    |    Timeout for spinning down (jiffies)
 249   |     |   |   |     |    |    |   Spindown offset (where disk stops)
 250   |     |   |   |     |    |    |   |  Select delay
 251   |     |   |   |     |    |    |   |  |  RPS
 252   |     |   |   |     |    |    |   |  |  |    Max number of tracks
 253   |     |   |   |     |    |    |   |  |  |    |     Interrupt timeout
 254   |     |   |   |     |    |    |   |  |  |    |     |   Max nonintlv. sectors
 255   |     |   |   |     |    |    |   |  |  |    |     |   | -Max Errors- flags */
 256 {{0,  500, 16, 16, 8000, 100, 300,  0, 2, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 257       0, { 7, 4, 8, 2, 1, 5, 3,10}, 150, 0 }, "unknown" },
 258 
 259 {{1,  300, 16, 16, 8000, 100, 300,  0, 2, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 260       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 150, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 261 
 262 {{2,  500, 16, 16, 6000,  40, 300, 14, 2, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 263       0, { 2, 5, 6,23,10,20,11, 0}, 150, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 264 
 265 {{3,  250, 16, 16, 3000, 100, 300,  0, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 266       0, { 4,22,21,30, 3, 0, 0, 0}, 150, 4 }, "720k" }, /*3 1/2 DD*/
 267 
 268 {{4,  500, 16, 16, 4000,  40, 300, 10, 2, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 269       0, { 7, 4,25,22,31,21,29,11}, 150, 7 }, "1.44M" }, /*3 1/2 HD*/
 270 
 271 {{5, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 272       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 273 
 274 {{6, 1000, 15,  8, 3000,  40, 300, 10, 2, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 275       0, { 7, 8, 4,25,28,22,31,21}, 150, 8 }, "2.88M" } /*3 1/2 ED*/
 276 /*    |  ---autodetected formats--   |   |      |
 277       read_track                     |   |    Name printed when booting
 278                                      |  Native format
 279                                    Frequency of disk change checks */
 280 };
 281 
 282 static struct floppy_drive_params drive_params[N_DRIVE];
 283 static struct floppy_drive_struct volatile drive_state[N_DRIVE];
 284 static struct floppy_write_errors volatile write_errors[N_DRIVE];
 285 static struct floppy_raw_cmd raw_cmd;
 286 
 287 /*
 288  * This struct defines the different floppy types.
 289  *
 290  * The 'stretch' tells if the tracks need to be doubled for some
 291  * types (ie 360kB diskette in 1.2MB drive etc). Others should
 292  * be self-explanatory.
 293  */
 294 static struct floppy_struct floppy_type[32] = {
 295         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 296         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 297         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 298         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 299         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 300         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 301         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 302         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 303         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 304         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 305 
 306         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 307         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 308         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 309         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 310         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 311         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 312         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 313         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 314         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 315         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 316 
 317         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x6C,"h880"  }, /* 20 880KB 5.25"   */
 318         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x6C,"D1040" }, /* 21 1.04MB 3.5"   */
 319         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x6C,"D1120" }, /* 22 1.12MB 3.5"   */
 320         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 321         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 322         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x6C,"H1920" }, /* 25 1.92MB 3.5"   */
 323         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x6C,"E3200" }, /* 26 3.20MB 3.5"   */
 324         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x6C,"E3520" }, /* 27 3.52MB 3.5"   */
 325         { 7680,48,2,80,0,0x25,0x63,0xCF,0x6C,"E3840" }, /* 28 3.84MB 3.5"   */
 326 
 327         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x6C,"H1840" }, /* 29 1.84MB 3.5"   */
 328         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 329         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 330 };
 331 
 332 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 333 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 334 
 335 /* Auto-detection: Disk type used until the next media change occurs. */
 336 struct floppy_struct *current_type[N_DRIVE] = {
 337         NULL, NULL, NULL, NULL
 338 #ifdef HAVE_2_CONTROLLERS
 339         ,
 340         NULL, NULL, NULL, NULL
 341 #endif
 342 };
 343 
 344 /*
 345  * User-provided type information. current_type points to
 346  * the respective entry of this array.
 347  */
 348 struct floppy_struct user_params[N_DRIVE];
 349 
 350 static int floppy_sizes[256];
 351 
 352 /*
 353  * The driver is trying to determine the correct media format
 354  * while probing is set. rw_interrupt() clears it after a
 355  * successful access.
 356  */
 357 static int probing = 0;
 358 
 359 /* Synchronization of FDC access. */
 360 #define FD_COMMAND_DETECT -2
 361 #define FD_COMMAND_NONE -1
 362 #define FD_COMMAND_ERROR 2
 363 #define FD_COMMAND_OKAY 3
 364 
 365 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 366 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 367 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 368 #define CALL(x) if( (x) == -EINTR) return -EINTR;
 369 
 370 /* Errors during formatting are counted here. */
 371 static int format_errors;
 372 
 373 /* Format request descriptor. */
 374 static struct format_descr format_req;
 375 
 376 /*
 377  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 378  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 379  * H is head unload time (1=16ms, 2=32ms, etc)
 380  */
 381 
 382 /*
 383  * Track buffer
 384  * Because these are written to by the DMA controller, they must
 385  * not contain a 64k byte boundary crossing, or data will be
 386  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 387  * Note that you must not change the sizes below without updating head.S.
 388  */
 389 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 390 #define max_buffer_sectors MAX_BUFFER_SECTORS
 391 
 392 int *errors;
 393 typedef void (*done_f)(int);
 394 struct cont_t {
 395 void (*interrupt)(void); /* this is called after the interrupt of the
 396                           * main command */
 397 void (*redo)(void); /* this is called to retry the operation */
 398 void (*error)(void); /* this is called to tally an error */
 399 done_f done; /* this is called to say if the operation has succeeded/failed */
 400 } *cont;
 401 
 402 static void floppy_start(void);
 403 static void redo_fd_request(void);
 404 static void recalibrate_floppy(void);
 405 static void seek_floppy(void);
 406 static void floppy_shutdown(void);
 407 
 408 static int floppy_grab_irq_and_dma(void);
 409 static void floppy_release_irq_and_dma(void);
 410 
 411 /*
 412  * The "reset" variable should be tested whenever an interrupt is scheduled,
 413  * after the commands have been sent. This is to ensure that the driver doesn't
 414  * get wedged when the interrupt doesn't come because of a failed command.
 415  * reset doesn't need to be tested before sending commands, because
 416  * output_byte is automatically disabled when reset is set.
 417  */
 418 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 419 static void reset_fdc(void);
 420 
 421 /*
 422  * These are global variables, as that's the easiest way to give
 423  * information to interrupts. They are the data used for the current
 424  * request.
 425  */
 426 #define NO_TRACK -1
 427 #define NEED_1_RECAL -2
 428 #define NEED_2_RECAL -3
 429 #define PROVEN_ABSENT -4
 430 
 431 /* buffer related variables */
 432 static int buffer_track = -1;
 433 static int buffer_drive = -1;
 434 static int buffer_min = -1;
 435 static int buffer_max = -1;
 436 
 437 /* fdc related variables, should end up in a struct */
 438 static struct floppy_fdc_state fdc_state[N_FDC];
 439 int fdc; /* current fdc */
 440 
 441 static struct floppy_struct * floppy = floppy_type;
 442 static unsigned char current_drive = 255;
 443 static long current_count_sectors = 0;
 444 static char *current_addr = 0;
 445 static unsigned char sector_t; /* sector in track */
 446 
 447 #ifdef DEBUGT
 448 long unsigned debugtimer;
 449 #endif
 450 
 451 /*
 452  * Debugging
 453  * =========
 454  */
 455 static inline void set_debugt(void)
     /*  */
 456 {
 457 #ifdef DEBUGT
 458         debugtimer = jiffies;
 459 #endif
 460 }
 461 
 462 static inline void debugt(char *message)
     /*  */
 463 {
 464 #ifdef DEBUGT
 465   if ( DP->flags & DEBUGT )
 466         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 467 #endif
 468 }
 469 
 470 /*
 471  * Bottom half floppy driver.
 472  * ==========================
 473  *
 474  * This part of the file contains the code talking directly to the hardware,
 475  * and also the main service loop (seek-configure-spinup-command)
 476  */
 477 
 478 /*
 479  * disk change.
 480  * This routine is responsible for maintaining the changed_floppies flag,
 481  * and the last_checked date.
 482  *
 483  * last_checked is the date of the last check which showed 'no disk change'
 484  * changed_floppies is set under two conditions:
 485  * 1. The floppy has been changed after some i/o to that floppy already
 486  *    took place.
 487  * 2. No floppy disk is in the drive.
 488  *
 489  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 490  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 491  *  each seek. If a disk is present, the disk change line should also be
 492  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 493  *  change line is set, this means either that no disk is in the drive, or
 494  *  that it has been removed since the last seek.
 495  *
 496  * This means that we really have a third possibility too:
 497  *  The floppy has been changed after the last seek.
 498  */
 499 
 500 static int disk_change(int drive)
     /*  */
 501 {
 502         if(inb_p(FD_DIR) & 0x80){
 503                 UDRS->flags |= FD_VERIFY; /* verify write protection */
 504                 
 505                 if(UDRS->maxblock || /* disk change check */
 506                    !(UDRS->flags & FD_DISK_NEWCHANGE)){/* disk presence check */
 507                         /* mark it changed or absent */
 508                         set_bit(drive,&changed_floppies);
 509 
 510                         /* invalidate its geometry */
 511                         if (UDRS->keep_data >= 0) {
 512                                 if ((DP->flags & FTD_MSG) &&
 513                                     current_type[drive] != NULL)
 514                                         DPRINT("Disk type is undefined after "
 515                                                "disk change\n");
 516                                 current_type[drive] = NULL;
 517                                 floppy_sizes[drive] = MAX_DISK_SIZE;
 518                         }
 519                 }
 520                 UDRS->flags |= FD_DISK_NEWCHANGE;
 521                 return 1;
 522         } else {
 523                 UDRS->last_checked=jiffies;
 524                 UDRS->flags &= ~FD_DISK_NEWCHANGE;
 525                 return 0;
 526         }
 527 }
 528 
 529 
 530 static int set_dor(int fdc, char mask, char data)
     /*  */
 531 {
 532         register unsigned char drive, unit, newdor,olddor;
 533 
 534         cli();
 535         olddor = FDCS->dor;
 536         newdor =  (olddor & mask) | data;
 537         if ( newdor != olddor ){
 538                 unit = olddor & 0x3;
 539                 drive = REVDRIVE(fdc,unit);
 540                 if ( olddor & ( 0x10 << unit ))
 541                         disk_change(drive);
 542                 FDCS->dor = newdor;
 543                 outb_p( newdor, FD_DOR);
 544         }
 545         sti();
 546         return olddor;
 547 }
 548 
 549 static void twaddle(void)
     /*  */
 550 {
 551         cli();
 552         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 553         outb_p(FDCS->dor, FD_DOR);
 554         sti();
 555 }
 556 
 557 /* reset all driver information about the current fdc. This is needed after
 558  * a reset, and after a raw command. */
 559 static void reset_fdc_info(int mode)
     /*  */
 560 {
 561         int drive;
 562 
 563         FDCS->spec1 = FDCS->spec2 = -1;
 564         FDCS->need_configure = 1;
 565         FDCS->perp_mode = 1;
 566         FDCS->rawcmd = 0;
 567         for ( drive = 0; drive < N_DRIVE; drive++)
 568                 if (FDC(drive) == fdc &&
 569                     UDRS->track != PROVEN_ABSENT &&
 570                     ( mode || UDRS->track != NEED_1_RECAL))
 571                         UDRS->track = NEED_2_RECAL;
 572 }
 573 
 574 /* selects the fdc and drive, and enables the fdc's input/dma. */
 575 static void set_fdc(int drive)
     /*  */
 576 {
 577         if ( drive >= 0 ){
 578                 fdc = FDC(drive);
 579                 current_drive = drive;
 580         }
 581         set_dor(fdc,~0,8);
 582 #ifdef HAVE_2_CONTROLLERS
 583         set_dor(1-fdc, ~8, 0);
 584 #endif
 585         if ( FDCS->rawcmd == 2 )
 586                 reset_fdc_info(1);
 587         if( inb_p(FD_STATUS) != STATUS_READY )
 588                 FDCS->reset = 1;
 589 }
 590 
 591 static int usage_count = 0;
 592 /* locks the driver */
 593 static int lock_fdc(int drive, int interruptible)
     /*  */
 594 {
 595 
 596         if(!usage_count){
 597                 printk("trying to lock fdc while usage count=0\n");
 598                 return -1;
 599         }
 600         floppy_grab_irq_and_dma();
 601         cli();
 602         while (fdc_busy && NO_SIGNAL)
 603                 interruptible_sleep_on(&fdc_wait);
 604         if(fdc_busy){
 605                 sti();
 606                 return -EINTR;
 607         }
 608         fdc_busy = 1;
 609         sti();
 610         command_status = FD_COMMAND_NONE;
 611         set_fdc(drive);
 612         return 0;
 613 }
 614 
 615 #define LOCK_FDC(drive,interruptible) \
 616 if(lock_fdc(drive,interruptible)) return -EINTR;
 617 
 618 /* unlocks the driver */
 619 static inline void unlock_fdc(void)
     /*  */
 620 {
 621         if (!fdc_busy)
 622                 DPRINT("FDC access conflict!\n");
 623 
 624         if ( DEVICE_INTR )
 625                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 626                         DEVICE_INTR);
 627         command_status = FD_COMMAND_NONE;
 628         timer_active &= ~(1 << FLOPPY_TIMER);
 629         fdc_busy = 0;
 630         floppy_release_irq_and_dma();
 631         wake_up(&fdc_wait);
 632 }
 633 
 634 /* switches the motor off after a given timeout */
 635 static void motor_off_callback(unsigned long nr)
     /*  */
 636 {
 637         unsigned char mask = ~(0x10 << UNIT(nr));
 638 
 639         set_dor( FDC(nr), mask, 0 );
 640 }
 641 
 642 static struct timer_list motor_off_timer[N_DRIVE] = {
 643         { NULL, NULL, 0, 0, motor_off_callback },
 644         { NULL, NULL, 0, 1, motor_off_callback },
 645         { NULL, NULL, 0, 2, motor_off_callback },
 646         { NULL, NULL, 0, 3, motor_off_callback }
 647 #ifdef HAVE_2_CONTROLLERS
 648         ,
 649         { NULL, NULL, 0, 4, motor_off_callback },
 650         { NULL, NULL, 0, 5, motor_off_callback },
 651         { NULL, NULL, 0, 6, motor_off_callback },
 652         { NULL, NULL, 0, 7, motor_off_callback }
 653 #endif
 654 };
 655 
 656 /* schedules motor off */
 657 static void floppy_off(unsigned int nr)
     /*  */
 658 {
 659         unsigned long volatile delta;
 660 
 661         del_timer(motor_off_timer+nr);
 662 
 663         /* make spindle stop in a position which minimizes spinup time
 664          * next time */
 665         if ( drive_params[nr].rps ){
 666                 delta = jiffies - drive_state[nr].first_read_date + HZ -
 667                         drive_params[nr].spindown_offset;
 668                 delta = (( delta * drive_params[nr].rps) % HZ ) /
 669                         drive_params[nr].rps;
 670                 motor_off_timer[nr].expires = drive_params[nr].spindown - delta;
 671         }
 672         add_timer(motor_off_timer+nr);
 673 }
 674 
 675 /*
 676  * cycle through all N_DRIVE floppy drives, for disk change testing.
 677  * stopping at current drive. This is done before any long operation, to
 678  * be sure to have up to date disk change information.
 679  */
 680 static void scandrives(void)
     /*  */
 681 {
 682         int i, drive, saved_drive;
 683 
 684         saved_drive = current_drive % N_DRIVE;
 685         for(i=0; i< N_DRIVE; i++){
 686                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 687                 if ( UDRS->fd_ref == 0 )
 688                         continue; /* skip closed drives */
 689                 set_fdc(drive);
 690                 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 691                     ((FDCS->dor & 0x3) != UNIT(drive)))
 692                         UDRS->select_date = jiffies;
 693                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 694                       (0x10 << UNIT(drive))))
 695                         /* switch the motor off again, if it was off to
 696                          * begin with */
 697                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 698         }
 699         current_drive = saved_drive;
 700 }
 701 
 702 typedef void (*timeout_fn)(unsigned long);
 703 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 704 
 705 /* this function makes sure that the disk stays in the drive during the
 706  * transfer */
 707 static void fd_watchdog(void)
     /*  */
 708 {
 709         if ( disk_change(current_drive) ){
 710                 DPRINT("disk removed during i/o\n");
 711                 floppy_shutdown();
 712         } else {                
 713                 del_timer(&fd_timer);
 714                 fd_timer.function = (timeout_fn) fd_watchdog;
 715                 fd_timer.expires = 10;
 716                 add_timer(&fd_timer);
 717         }
 718 }
 719 
 720 static void main_command_interrupt(void)
     /*  */
 721 {
 722         del_timer(&fd_timer);
 723         cont->interrupt();
 724 }
 725 
 726 /* waits for a delay (spinup or select) to pass */
 727 static int wait_for_completion(int nr, int delay, timeout_fn function)
     /*  */
 728 {
 729         if ( FDCS->reset ){
 730                 reset_fdc(); /* do the reset during sleep to win time
 731                               * if we don't need to sleep, it's a good
 732                               * occasion anyways */
 733                 return 1;
 734         }
 735 
 736         if ( jiffies < delay ){
 737                 del_timer(&fd_timer);
 738                 fd_timer.function = function;
 739                 fd_timer.expires = delay  - jiffies;
 740                 add_timer(&fd_timer);
 741                 return 1;
 742         }
 743         return 0;
 744 }
 745 
 746 static void setup_DMA(void)
     /*  */
 747 {
 748 #ifdef SANITY
 749         if ((!CURRENT ||
 750              CURRENT->buffer != current_addr ||
 751              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 752             (current_addr < floppy_track_buffer ||
 753              current_addr + raw_cmd.length >
 754              floppy_track_buffer + 1024 * max_buffer_sectors)){
 755                 printk("bad address. start=%p lg=%lx tb=%p\n",
 756                        current_addr, raw_cmd.length, floppy_track_buffer);
 757                 if ( CURRENT ){
 758                         printk("buffer=%p nr=%lx cnr=%lx\n",
 759                                CURRENT->buffer, CURRENT->nr_sectors,
 760                                CURRENT->current_nr_sectors);
 761                 }
 762                 cont->done(0);
 763                 FDCS->reset=1;
 764                 return;
 765         }
 766         if ((long) current_addr % 512 ){
 767                 printk("non aligned address: %p\n", current_addr );
 768                 cont->done(0);
 769                 FDCS->reset=1;
 770                 return;
 771         }
 772         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 773             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 774                 printk("DMA crossing 64-K boundary %p-%p\n",
 775                        current_addr, current_addr + raw_cmd.length);
 776                 cont->done(0);
 777                 FDCS->reset=1;
 778                 return;
 779         }
 780 
 781 #endif
 782         cli();
 783         disable_dma(FLOPPY_DMA);
 784         clear_dma_ff(FLOPPY_DMA);
 785         set_dma_mode(FLOPPY_DMA,
 786                      (raw_cmd.flags & FD_RAW_READ)?
 787                      DMA_MODE_READ : DMA_MODE_WRITE);
 788         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 789         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 790         enable_dma(FLOPPY_DMA);
 791         sti();
 792 }
 793 
 794 /* sends a command byte to the fdc */
 795 static int output_byte(char byte)
     /*  */
 796 {
 797         int counter;
 798         unsigned char status;
 799 
 800         if (FDCS->reset)
 801                 return -1;
 802         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 803                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 804                 if (!(status & STATUS_READY))
 805                         continue;
 806                 if (status == STATUS_READY){
 807                         outb_p(byte,FD_DATA);
 808                         return 0;
 809                 } else
 810                         break;
 811         }
 812         FDCS->reset = 1;
 813         if ( !initialising )
 814                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
 815                         byte, status);
 816         return -1;
 817 }
 818 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 819 
 820 /* gets the response from the fdc */
 821 static int result(void)
     /*  */
 822 {
 823         int i = 0, counter, status;
 824 
 825         if (FDCS->reset)
 826                 return -1;
 827         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 828                 status = inb_p(FD_STATUS)&
 829                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 830                 if (!(status & STATUS_READY))
 831                         continue;
 832                 if (status == STATUS_READY)
 833                         return i;
 834                 if (status & STATUS_DMA )
 835                         break;
 836                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 837                         if (i >= MAX_REPLIES) {
 838                                 DPRINT("floppy_stat reply overrun\n");
 839                                 break;
 840                         }
 841                         reply_buffer[i++] = inb_p(FD_DATA);
 842                 }
 843         }
 844         FDCS->reset = 1;
 845         if ( !initialising )
 846                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
 847                         status, fdc, i);
 848         return -1;
 849 }
 850 
 851 /* Set perpendicular mode as required, based on data rate, if supported.
 852  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 853  */
 854 static inline void perpendicular_mode(void)
     /*  */
 855 {
 856         unsigned char perp_mode;
 857 
 858         if (!floppy)
 859                 return;
 860         if (floppy->rate & 0x40){
 861                 switch(raw_cmd.rate){
 862                 case 0:
 863                         perp_mode=2;
 864                         break;
 865                 case 3:
 866                         perp_mode=3;
 867                         break;
 868                 default:
 869                         DPRINT("Invalid data rate for perpendicular mode!\n");
 870                         cont->done(0);
 871                         FDCS->reset = 1; /* convenient way to return to
 872                                           * redo without to much hassle (deep
 873                                           * stack et al. */
 874                         return;
 875                 }
 876         } else
 877                 perp_mode = 0;
 878                         
 879         if ( FDCS->perp_mode == perp_mode )
 880                 return;
 881         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 882                 output_byte(FD_PERPENDICULAR);
 883                 output_byte(perp_mode);
 884                 FDCS->perp_mode = perp_mode;
 885         } else if (perp_mode) {
 886                 DPRINT("perpendicular mode not supported by this FDC.\n");
 887         }
 888 } /* perpendicular_mode */
 889 
 890 #define NOMINAL_DTR 500
 891 
 892 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
 893  * head load time, and DMA disable flag to values needed by floppy.
 894  *
 895  * The value "dtr" is the data transfer rate in Kbps.  It is needed
 896  * to account for the data rate-based scaling done by the 82072 and 82077
 897  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 898  * 8272a).
 899  *
 900  * Note that changing the data transfer rate has a (probably deleterious)
 901  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 902  * fdc_specify is called again after each data transfer rate
 903  * change.
 904  *
 905  * srt: 1000 to 16000 in microseconds
 906  * hut: 16 to 240 milliseconds
 907  * hlt: 2 to 254 milliseconds
 908  *
 909  * These values are rounded up to the next highest available delay time.
 910  */
 911 static void fdc_specify(void)
     /*  */
 912 {
 913         unsigned char spec1, spec2;
 914         int srt, hlt, hut;
 915         unsigned long dtr = NOMINAL_DTR;
 916         unsigned long scale_dtr = NOMINAL_DTR;
 917         int hlt_max_code = 0x7f;
 918         int hut_max_code = 0xf;
 919 
 920         if (FDCS->need_configure && FDCS->has_fifo) {
 921                 if ( FDCS->reset )
 922                         return;
 923                 /* Turn on FIFO for 82077-class FDC (improves performance) */
 924                 /* TODO: lock this in via LOCK during initialization */
 925                 output_byte(FD_CONFIGURE);
 926                 output_byte(0);
 927                 output_byte(0x1A);      /* FIFO on, polling off, 10 byte threshold */
 928                 output_byte(0);         /* precompensation from track 0 upwards */
 929                 if ( FDCS->reset ){
 930                         FDCS->has_fifo=0;
 931                         return;
 932                 }
 933                 FDCS->need_configure = 0;
 934                 /*DPRINT("FIFO enabled\n");*/
 935         }
 936 
 937         switch (raw_cmd.rate & 0x03) {
 938         case 3:
 939                 dtr = 1000;
 940                 break;
 941         case 1:
 942                 dtr = 300;
 943                 break;
 944         case 2:
 945                 dtr = 250;
 946                 break;
 947         }
 948 
 949         if (FDCS->version >= FDC_82072) {
 950                 scale_dtr = dtr;
 951                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
 952                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
 953         }
 954 
 955         /* Convert step rate from microseconds to milliseconds and 4 bits */
 956         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 957         if (srt > 0xf)
 958                 srt = 0xf;
 959         else if (srt < 0)
 960                 srt = 0;
 961 
 962         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 963         if (hlt < 0x01)
 964                 hlt = 0x01;
 965         else if (hlt > 0x7f)
 966                 hlt = hlt_max_code;
 967 
 968         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 969         if (hut < 0x1)
 970                 hut = 0x1;
 971         else if (hut > 0xf)
 972                 hut = hut_max_code;
 973 
 974         spec1 = (srt << 4) | hut;
 975         spec2 = (hlt << 1);
 976 
 977         /* If these parameters did not change, just return with success */
 978         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
 979                 /* Go ahead and set spec1 and spec2 */
 980                 output_byte(FD_SPECIFY);
 981                 output_byte(FDCS->spec1 = spec1);
 982                 output_byte(FDCS->spec2 = spec2);
 983         }
 984 } /* fdc_specify */
 985 
 986 /* Set the FDC's data transfer rate on behalf of the specified drive.
 987  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
 988  * of the specify command (i.e. using the fdc_specify function).
 989  */
 990 static void fdc_dtr(void)
     /*  */
 991 {
 992         /* If data rate not already set to desired value, set it. */
 993         if ( raw_cmd.rate == FDCS->dtr)
 994                 return;
 995         
 996         /* Set dtr */
 997         outb_p(raw_cmd.rate, FD_DCR);
 998         
 999         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1000          * need a stabilization period of several milliseconds to be
1001          * enforced after data rate changes before R/W operations.
1002          * Pause 5 msec to avoid trouble.
1003          */
1004         udelay(5000);
1005         FDCS->dtr = raw_cmd.rate;
1006 } /* fdc_dtr */
1007 
1008 static void tell_sector(void)
     /*  */
1009 {
1010         printk(": track %d, head %d, sector %d, size %d",
1011                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1012 } /* tell_sector */
1013 
1014 
1015 /*
1016  * Ok, this error interpreting routine is called after a
1017  * DMA read/write has succeeded
1018  * or failed, so we check the results, and copy any buffers.
1019  * hhb: Added better error reporting.
1020  * ak: Made this into a separate routine.
1021  */
1022 static int interpret_errors(void)
     /*  */
1023 {
1024         char bad;
1025 
1026         if (inr!=7) {
1027                 DPRINT("-- FDC reply error");
1028                 FDCS->reset = 1;
1029                 return 1;
1030         }
1031 
1032         /* check IC to find cause of interrupt */
1033         switch ((ST0 & ST0_INTR)>>6) {
1034                 case 1: /* error occured during command execution */
1035                         bad = 1;
1036                         if (ST1 & ST1_WP) {
1037                                 DPRINT("Drive is write protected\n");
1038                                 DRS->flags &= ~FD_DISK_WRITABLE;
1039                                 cont->done(0);
1040                                 bad = 2;
1041                         } else if (ST1 & ST1_ND) {
1042                                 DRS->flags |= FD_NEED_TWADDLE;
1043                         } else if (ST1 & ST1_OR) {
1044                                 if (DP->flags & FTD_MSG )
1045                                         DPRINT("Over/Underrun - retrying\n");
1046                                 bad = 0;
1047                         }else if(*errors >= DP->max_errors.reporting){
1048                                 DPRINT("");
1049                                 if (ST0 & ST0_ECE) {
1050                                         printk("Recalibrate failed!");
1051                                 } else if (ST2 & ST2_CRC) {
1052                                         printk("data CRC error");
1053                                         tell_sector();
1054                                 } else if (ST1 & ST1_CRC) {
1055                                         printk("CRC error");
1056                                         tell_sector();
1057                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1058                                         if (!probing) {
1059                                                 printk("sector not found");
1060                                                 tell_sector();
1061                                         } else
1062                                                 printk("probe failed...");
1063                                 } else if (ST2 & ST2_WC) {      /* seek error */
1064                                         printk("wrong cylinder");
1065                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1066                                         printk("bad cylinder");
1067                                 } else {
1068                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1069                                         tell_sector();
1070                                 }
1071                                 printk("\n");
1072 
1073                         }
1074                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1075                                 /* wrong cylinder => recal */
1076                                 DRS->track = NEED_2_RECAL;
1077                         return bad;
1078                 case 2: /* invalid command given */
1079                         DPRINT("Invalid FDC command given!\n");
1080                         cont->done(0);
1081                         return 2;
1082                 case 3:
1083                         DPRINT("Abnormal termination caused by polling\n");
1084                         cont->error();
1085                         return 2;
1086                 default: /* (0) Normal command termination */
1087                         return 0;
1088         }
1089 }
1090 
1091 /*
1092  * This routine is called when everything should be correctly set up
1093  * for the transfer (ie floppy motor is on, the correct floppy is
1094  * selected, and the head is sitting on the right track).
1095  */
1096 static void setup_rw_floppy(void)
     /*  */
1097 {
1098         int i,ready_date,r, flags,dflags;
1099         timeout_fn function;
1100 
1101         flags = raw_cmd.flags;
1102         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1103                 flags |= FD_RAW_INTR;
1104 
1105         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1106                 ready_date = DRS->spinup_date + DP->spinup;             
1107                 /* If spinup will take a long time, rerun scandrives
1108                  * again just before spinup completion. Beware that
1109                  * after scandrives, we must again wait for selection.
1110                  */
1111                 if ( ready_date > jiffies + DP->select_delay){
1112                         ready_date -= DP->select_delay;
1113                         function = (timeout_fn) floppy_start;
1114                 } else
1115                         function = (timeout_fn) setup_rw_floppy;
1116 
1117                 /* wait until the floppy is spinning fast enough */
1118                 if (wait_for_completion(current_drive,ready_date,function))
1119                         return;
1120         }
1121         dflags = DRS->flags;
1122 
1123         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1124                 setup_DMA();
1125         
1126         if ( flags & FD_RAW_INTR )
1127                 SET_INTR(main_command_interrupt);
1128 
1129         r=0;
1130         for(i=0; i< raw_cmd.cmd_count; i++)
1131                 r|=output_byte( raw_cmd.cmd[i] );
1132 
1133 #ifdef DEBUGT
1134         debugt("rw_command: ");
1135 #endif
1136         if ( r ){
1137                 reset_fdc();
1138                 return;
1139         }
1140 
1141         if ( ! ( flags & FD_RAW_INTR )){
1142                 inr = result();
1143                 cont->interrupt();
1144         } else if ( flags & FD_RAW_NEED_DISK )
1145                 fd_watchdog();
1146 }
1147 
1148 #ifdef SILENT_DC_CLEAR
1149 static int blind_seek;
1150 #endif
1151 
1152 /*
1153  * This is the routine called after every seek (or recalibrate) interrupt
1154  * from the floppy controller.
1155  */
1156 static void seek_interrupt(void)
     /*  */
1157 {
1158 #ifdef DEBUGT
1159         debugt("seek interrupt:");
1160 #endif
1161 #ifdef SILENT_DC_CLEAR
1162         set_dor(fdc, ~0,  (0x10 << UNIT(current_drive)));
1163 #endif
1164         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1165                 DPRINT("seek failed\n");
1166                 DRS->track = NEED_2_RECAL;
1167                 cont->error();
1168                 cont->redo();
1169                 return;
1170         }
1171         if (DRS->track >= 0 && DRS->track != ST1    
1172 #ifdef SILENT_DC_CLEAR
1173             && !blind_seek
1174 #endif
1175             )
1176                 DRS->flags &= ~FD_DISK_NEWCHANGE; /* effective seek */
1177         DRS->track = ST1;
1178         seek_floppy();
1179 }
1180 
1181 static void check_wp(void)
     /*  */
1182 {
1183         if (DRS->flags & FD_VERIFY) {
1184                 /* check write protection */
1185                 output_byte( FD_GETSTATUS );
1186                 output_byte( UNIT(current_drive) );
1187                 if ( result() != 1 ){
1188                         FDCS->reset = 1;
1189                         return;
1190                 }
1191                 DRS->flags &= ~(FD_VERIFY | FD_DISK_WRITABLE | FD_NEED_TWADDLE);
1192 
1193                 if (!( ST3  & 0x40))
1194                         DRS->flags |= FD_DISK_WRITABLE;
1195         }
1196 }
1197 
1198 static void seek_floppy(void)
     /*  */
1199 {
1200         int track;
1201 
1202 #ifdef SILENT_DC_CLEAR
1203         blind_seek=0;
1204 #endif
1205         disk_change(current_drive);
1206         if ((raw_cmd.flags & FD_RAW_NEED_DISK) &&
1207             test_bit(current_drive,&changed_floppies)){
1208                 /* the media changed flag should be cleared after the seek.
1209                  * If it isn't, this means that there is really no disk in
1210                  * the drive.
1211                  */
1212                 cont->done(0);
1213                 cont->redo();
1214                 return;
1215         }
1216         if ( DRS->track <= NEED_1_RECAL ){
1217                 recalibrate_floppy();
1218                 return;
1219         } else if ((DRS->flags & FD_DISK_NEWCHANGE) &&
1220                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1221                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1222                 /* we seek to clear the media-changed condition. Does anybody
1223                  * know a more elegant way, which works on all drives? */
1224                 if ( raw_cmd.track )
1225                         track = raw_cmd.track - 1;
1226                 else {
1227 #ifdef SILENT_DC_CLEAR
1228                         set_dor(fdc, ~ (0x10 << UNIT(current_drive)), 0);
1229                         blind_seek = 1;
1230 #endif
1231                         track = 1;
1232                 }
1233         } else {
1234                 check_wp();
1235                 if (raw_cmd.track != DRS->track)
1236                         track = raw_cmd.track;
1237                 else {
1238                         setup_rw_floppy();
1239                         return;
1240                 }
1241         }
1242 
1243 #ifndef SILENT_DC_CLEAR
1244         if ( !track && DRS->track >= 0 && DRS->track < 80 ){
1245                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1246                 /* if we go to track 0 anyways, we can just as well use
1247                  * recalibrate */
1248                 recalibrate_floppy();
1249         } else 
1250 #endif
1251         {
1252                 SET_INTR(seek_interrupt);
1253                 output_byte(FD_SEEK);
1254                 output_byte(UNIT(current_drive));
1255                 LAST_OUT(track);
1256 #ifdef DEBUGT
1257                 debugt("seek command:");
1258 #endif
1259         }
1260 }
1261 
1262 static void recal_interrupt(void)
     /*  */
1263 {
1264 #ifdef DEBUGT
1265         debugt("recal interrupt:");
1266 #endif
1267         if (inr !=2 )
1268                 FDCS->reset = 1;
1269         else if (ST0 & ST0_ECE) {
1270                 switch(DRS->track){
1271                 case PROVEN_ABSENT:
1272 #ifdef DEBUGT
1273                         debugt("recal interrupt proven absent:");
1274 #endif
1275                         /* fall through */
1276                 case NEED_1_RECAL:
1277 #ifdef DEBUGT
1278                         debugt("recal interrupt need 1 recal:");
1279 #endif
1280                         /* after a second recalibrate, we still haven't
1281                          * reached track 0. Probably no drive. Raise an
1282                          * error, as failing immediately might upset 
1283                          * computers possessed by the Devil :-) */
1284                         cont->error();
1285                         cont->redo();
1286                         return;
1287                 case NEED_2_RECAL:
1288 #ifdef DEBUGT
1289                         debugt("recal interrupt need 2 recal:");
1290 #endif
1291                         /* If we already did a recalibrate, and we are not at
1292                          * track 0, this means we have moved. (The only way
1293                          * not to move at recalibration is to be already at
1294                          * track 0.) Clear the new change flag
1295                          */
1296                         DRS->flags &= ~FD_DISK_NEWCHANGE;
1297                         /* fall through */
1298                 default:
1299 #ifdef DEBUGT
1300                         debugt("recal interrupt default:");
1301 #endif
1302                         /* Recalibrate moves the head by at most 80 steps. If
1303                          * after one recalibrate we don't have reached track
1304                          * 0, this might mean that we started beyond track 80.
1305                          * Try again.
1306                          */
1307                         DRS->track = NEED_1_RECAL;
1308                         break;
1309                 }
1310         } else
1311                 DRS->track = ST1;
1312         seek_floppy();
1313 }
1314 
1315 /*
1316  * Unexpected interrupt - Print as much debugging info as we can...
1317  * All bets are off...
1318  */
1319 static void unexpected_floppy_interrupt(void)
     /*  */
1320 {
1321         int i;
1322         if ( initialising )
1323                 return;
1324         DPRINT("unexpected interrupt\n");
1325         if ( inr >= 0 )
1326                 for(i=0; i<inr; i++)
1327                         printk("%d %x\n", i, reply_buffer[i] );
1328         while(1){
1329                 output_byte(FD_SENSEI);
1330                 inr=result();
1331                 if ( inr != 2 )
1332                         break;
1333                 printk("sensei\n");
1334                 for(i=0; i<inr; i++)
1335                         printk("%d %x\n", i, reply_buffer[i] );
1336         }
1337         FDCS->reset = 1;
1338 }
1339 
1340 struct tq_struct floppy_tq = 
1341 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1342 
1343 /* interrupt handler */
1344 static void floppy_interrupt(int unused)
     /*  */
1345 {
1346         void (*handler)(void) = DEVICE_INTR;
1347 
1348         CLEAR_INTR;
1349         if ( fdc >= N_FDC ){ /* we don't even know which FDC is the culprit */
1350                 printk("floppy interrupt on bizarre fdc\n");
1351                 return;
1352         }
1353         inr = result();
1354         if (!handler){
1355                 unexpected_floppy_interrupt();
1356                 return;
1357         }
1358         if ( inr == 0 ){
1359                 do {
1360                         output_byte(FD_SENSEI);
1361                         inr = result();
1362                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1363         }
1364         floppy_tq.routine = (void *)(void *) handler;
1365         queue_task_irq(&floppy_tq, &tq_timer);
1366 }
1367 
1368 static void recalibrate_floppy(void)
     /*  */
1369 {
1370 #ifdef DEBUGT
1371         debugt("recalibrate floppy:");
1372 #endif
1373         SET_INTR(recal_interrupt);
1374         output_byte(FD_RECALIBRATE);
1375         LAST_OUT(UNIT(current_drive));
1376 }
1377 
1378 /*
1379  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1380  */
1381 static void reset_interrupt(void)
     /*  */
1382 {
1383 #ifdef DEBUGT
1384         debugt("reset interrupt:");
1385 #endif
1386         fdc_specify();          /* reprogram fdc */
1387         result();               /* get the status ready for set_fdc */
1388         if ( FDCS->reset )
1389                 cont->error(); /* a reset just after a reset. BAD! */
1390         cont->redo();
1391 }
1392 
1393 /*
1394  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1395  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1396  */
1397 static void reset_fdc(void)
     /*  */
1398 {
1399         SET_INTR(reset_interrupt);
1400         FDCS->reset = 0;
1401         reset_fdc_info(0);
1402         if ( FDCS->version >= FDC_82077 )
1403                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1404         else {
1405                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1406                 udelay(FD_RESET_DELAY);
1407                 outb(FDCS->dor, FD_DOR);
1408         }
1409 }
1410 
1411 static void empty(void)
     /*  */
1412 {
1413 }
1414 
1415 void show_floppy(void)
     /*  */
1416 {
1417         int i;
1418 
1419         printk("\n");
1420         printk("floppy driver state\n");
1421         printk("-------------------\n");
1422         for(i=0; i<N_FDC; i++){
1423                 printk("dor %d = %x\n", i, fdc_state[i].dor );
1424                 outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1425                 udelay(1000); /* maybe we'll catch an interrupt... */
1426         }
1427         printk("status=%x\n", inb_p(FD_STATUS));
1428         printk("fdc_busy=%d\n", fdc_busy);
1429         if( DEVICE_INTR)
1430                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1431         if(floppy_tq.sync)
1432                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1433         if(fd_timer.prev)
1434                 printk("fd_timer.function=%p\n", fd_timer.function);
1435         if( timer_active & (1 << FLOPPY_TIMER)){
1436                 printk("timer_table=%p\n",timer_table[FLOPPY_TIMER].fn);
1437                 printk("expires=%ld\n",timer_table[FLOPPY_TIMER].expires);
1438                 printk("now=%ld\n",jiffies);
1439         }
1440         printk("cont=%p\n", cont);
1441         printk("CURRENT=%p\n", CURRENT);
1442         printk("command_status=%d\n", command_status);
1443         printk("\n");
1444 }
1445 
1446 static void floppy_shutdown(void)
     /*  */
1447 {
1448         CLEAR_INTR;
1449         floppy_tq.routine = (void *)(void *) empty;
1450         del_timer( &fd_timer);
1451 
1452         disable_dma(FLOPPY_DMA);
1453         /* avoid dma going to a random drive after shutdown */
1454 
1455         if(!initialising)
1456                 DPRINT("floppy timeout\n");
1457         FDCS->reset = 1;
1458         cont->done(0);
1459         cont->redo(); /* this will recall reset when needed */
1460 }
1461 
1462 /* start motor, check media-changed condition and write protection */
1463 static void start_motor(void)
     /*  */
1464 {
1465         int mask, data;
1466 
1467         mask = 0xfc;
1468         data = UNIT(current_drive);
1469         if ( (FDCS->dor & 0x03) != UNIT(current_drive) )
1470                 /* notes select time if floppy is not yet selected */
1471                 DRS->select_date = jiffies;
1472 
1473         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1474                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1475                         set_debugt();
1476                         /* no read since this drive is running */
1477                         DRS->first_read_date = 0;
1478                         /* note motor start time if motor is not yet running */
1479                         DRS->spinup_date = jiffies;
1480                         data |= (0x10 << UNIT(current_drive));
1481                 }
1482         } else
1483                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1484                         mask &= ~(0x10 << UNIT(current_drive));
1485 
1486         /* starts motor and selects floppy */
1487         del_timer(motor_off_timer + current_drive);
1488         set_dor( fdc, mask, data);
1489         if( raw_cmd.flags & FD_RAW_NO_MOTOR)
1490                 return;
1491 
1492         if(disk_change(current_drive))
1493                 twaddle(); /* this clears the dcl on certain drive/controller
1494                             * combinations */
1495 
1496         return;
1497 }
1498 
1499 static void floppy_ready(void)
     /*  */
1500 {
1501         CHECK_RESET;
1502         start_motor();
1503 
1504         /* wait_for_completion also schedules reset if needed. */
1505         if(wait_for_completion(current_drive,
1506                                DRS->select_date+DP->select_delay,
1507                                (timeout_fn) floppy_ready))
1508                 return;
1509         fdc_dtr();
1510         if ( raw_cmd.flags & FD_RAW_NEED_SEEK ){
1511                 perpendicular_mode();
1512                 fdc_specify(); /* must be done here because of hut, hlt ... */
1513                 seek_floppy();
1514         } else
1515                 setup_rw_floppy();
1516 }
1517 
1518 static void floppy_start(void)
     /*  */
1519 {
1520         timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
1521         timer_active |= 1 << FLOPPY_TIMER;
1522         scandrives();
1523         floppy_ready();
1524 }
1525 
1526 /*
1527  * ========================================================================
1528  * here ends the bottom half. Exported routines are:
1529   * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1530  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1531  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1532  * and set_dor.
1533  * ========================================================================
1534  */
1535 /*
1536  * General purpose continuations.
1537  * ==============================
1538  */
1539 
1540 static void do_wakeup(void)
     /*  */
1541 {
1542         timer_active &= ~(1 << FLOPPY_TIMER);
1543         cont = 0;
1544         command_status += 2;
1545         wake_up(&command_done);
1546 }
1547 
1548 static struct cont_t wakeup_cont={
1549         empty,
1550         do_wakeup,
1551         empty,
1552         (done_f)empty
1553 };
1554 
1555 static int wait_til_done( void (*handler)(void ), int interruptible )
     /*  */
1556 {
1557         int ret;
1558 
1559         floppy_tq.routine = (void *)(void *) handler;
1560         queue_task(&floppy_tq, &tq_timer);
1561 
1562         cli();
1563         while(command_status < 2 && NO_SIGNAL)
1564                 if (current->pid)
1565                         interruptible_sleep_on(&command_done);
1566                 else {
1567                         sti();
1568                         run_task_queue(&tq_timer);
1569                         cli();
1570                 }
1571         if(command_status < 2){
1572                 sti();
1573                 floppy_shutdown();
1574                 redo_fd_request();
1575                 return -EINTR;
1576         }
1577         sti();
1578 
1579         if ( FDCS->reset )
1580                 command_status = FD_COMMAND_ERROR;
1581         if ( command_status == FD_COMMAND_OKAY )
1582                 ret=0;
1583         else
1584                 ret=-EIO;
1585         command_status = FD_COMMAND_NONE;
1586         return ret;
1587 }
1588 
1589 static void generic_done(int result)
     /*  */
1590 {
1591         command_status = result;
1592         cont = &wakeup_cont;
1593 }
1594 
1595 static void generic_success(void)
     /*  */
1596 {
1597         generic_done(1);
1598 }
1599 
1600 static void generic_failure(void)
     /*  */
1601 {
1602         generic_done(0);
1603 }
1604 
1605 static void success_and_wakeup(void)
     /*  */
1606 {
1607         generic_success();
1608         do_wakeup();
1609 }
1610 
1611 static void failure_and_wakeup(void)
     /*  */
1612 {
1613         generic_failure();
1614         do_wakeup();
1615 }
1616 
1617 /*
1618  * formatting and rw support.
1619  * ==========================
1620  */
1621 
1622 static int next_valid_format(void)
     /*  */
1623 {
1624         int probed_format;
1625         while(1){
1626                 probed_format = DRS->probed_format;
1627                 if ( probed_format > N_DRIVE ||
1628                     ! DP->autodetect[probed_format] ){
1629                         DRS->probed_format = 0;
1630                         return 1;
1631                 }
1632                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1633                         DRS->probed_format = probed_format;
1634                         return 0;
1635                 }
1636                 probed_format++;
1637         }
1638 }
1639 
1640 static void bad_flp_intr(void)
     /*  */
1641 {
1642         if ( probing ){
1643                 DRS->probed_format++;
1644                 if ( !next_valid_format())
1645                         return;
1646         }
1647         (*errors)++;
1648         if (*errors > DRWE->badness)
1649                 DRWE->badness = *errors;
1650         if (*errors > DP->max_errors.abort)
1651                 cont->done(0);
1652         if (*errors > DP->max_errors.reset)
1653                 FDCS->reset = 1;
1654         else if (*errors > DP->max_errors.recal)
1655                 DRS->track = NEED_2_RECAL;
1656 }
1657 
1658 static void set_floppy(int device)
     /*  */
1659 {
1660         if (TYPE(device))
1661                 floppy = TYPE(device) + floppy_type;
1662         else
1663                 floppy = current_type[ DRIVE(device) ];
1664 }
1665 
1666 /*
1667  * formatting and support.
1668  * =======================
1669  */
1670 static void format_interrupt(void)
     /*  */
1671 {
1672         switch (interpret_errors()){
1673         case 1:
1674                 cont->error();
1675         case 2:
1676                 break;
1677         case 0:
1678                 cont->done(1);
1679         }
1680         cont->redo();
1681 }
1682 
1683 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
1684 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
1685 #define CT(x) ( (x) | 0x40 )
1686 static void setup_format_params(void)
     /*  */
1687 {
1688         struct fparm {
1689                 unsigned char track,head,sect,size;
1690         } *here = (struct fparm *)floppy_track_buffer;
1691         int il,n;
1692         int count,head_shift,track_shift;
1693 
1694         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1695                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1696         raw_cmd.rate = floppy->rate & 0x3;
1697         raw_cmd.cmd_count = NR_F;
1698         COMMAND = FM_MODE(floppy,FD_FORMAT);
1699         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1700         F_SIZECODE = FD_SIZECODE(floppy);
1701         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1702         F_GAP = floppy->fmt_gap;
1703         F_FILL = FD_FILL_BYTE;
1704 
1705         current_addr = floppy_track_buffer;
1706         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1707 
1708         /* allow for about 30ms for data transport per track */
1709         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1710 
1711         /* a ``cylinder'' is two tracks plus a little stepping time */
1712         track_shift = 2 * head_shift + 1;
1713 
1714         /* position of logical sector 1 on this track */
1715         n = (track_shift * format_req.track + head_shift * format_req.head )
1716                 % F_SECT_PER_TRACK;
1717 
1718         /* determine interleave */
1719         il = 1;
1720         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
1721                 il++;
1722 
1723         /* initialize field */
1724         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1725                 here[count].track = format_req.track;
1726                 here[count].head = format_req.head;
1727                 here[count].sect = 0;
1728                 here[count].size = F_SIZECODE;
1729         }
1730         /* place logical sectors */
1731         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1732                 here[n].sect = count;
1733                 n = (n+il) % F_SECT_PER_TRACK;
1734                 if (here[n].sect) { /* sector busy, find next free sector */
1735                         ++n;
1736                         if (n>= F_SECT_PER_TRACK) {
1737                                 n-=F_SECT_PER_TRACK;
1738                                 while (here[n].sect) ++n;
1739                         }
1740                 }
1741         }
1742 }
1743 
1744 static void redo_format(void)
     /*  */
1745 {
1746         raw_cmd.track = format_req.track << floppy->stretch;
1747         buffer_track = -1;
1748         setup_format_params();
1749         clear_bit(current_drive, &changed_floppies);
1750         floppy_start();
1751 #ifdef DEBUGT
1752         debugt("queue format request");
1753 #endif
1754 }
1755 
1756 static struct cont_t format_cont={
1757         format_interrupt,
1758         redo_format,
1759         bad_flp_intr,
1760         generic_done };
1761 
1762 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1763 {
1764         int okay;
1765 
1766         LOCK_FDC(DRIVE(device),1);
1767         set_floppy(device);
1768         if (!floppy ||
1769             tmp_format_req->track >= floppy->track ||
1770             tmp_format_req->head >= floppy->head){
1771                 redo_fd_request();
1772                 return -EINVAL;
1773         }
1774         format_req = *tmp_format_req;
1775         format_errors = 0;
1776         cont = &format_cont;
1777         errors = &format_errors;
1778         CALL(okay=wait_til_done(redo_format,1));
1779         redo_fd_request();
1780         return okay;
1781 }
1782 
1783 /*
1784  * Buffer read/write and support
1785  * =============================
1786  */
1787 
1788 /* new request_done. Can handle physical sectors which are smaller than a
1789  * logical buffer */
1790 static void request_done(int uptodate)
     /*  */
1791 {
1792         int block;
1793 
1794         probing = 0;
1795         timer_active &= ~(1 << FLOPPY_TIMER);
1796 
1797         if (!CURRENT){
1798                 DPRINT("request list destroyed in floppy request done\n");
1799                 return;
1800         }
1801         if (uptodate){
1802                 /* maintain values for invalidation on geometry
1803                    change */
1804                 block = current_count_sectors + CURRENT->sector;
1805                 if (block > DRS->maxblock)
1806                         DRS->maxblock=block;
1807                 if ( block > floppy->sect)
1808                         DRS->maxtrack = 1;
1809 
1810                 /* unlock chained buffers */
1811                 while (current_count_sectors && CURRENT &&
1812                        current_count_sectors >= CURRENT->current_nr_sectors ){
1813                         current_count_sectors -= CURRENT->current_nr_sectors;
1814                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1815                         CURRENT->sector += CURRENT->current_nr_sectors;
1816                         end_request(1);
1817                 }
1818                 if ( current_count_sectors && CURRENT){
1819                         /* "unlock" last subsector */
1820                         CURRENT->buffer += current_count_sectors <<9;
1821                         CURRENT->current_nr_sectors -= current_count_sectors;
1822                         CURRENT->nr_sectors -= current_count_sectors;
1823                         CURRENT->sector += current_count_sectors;
1824                         return;
1825                 }
1826 
1827                 if ( current_count_sectors && ! CURRENT )
1828                         DPRINT("request list destroyed in floppy request done\n");
1829 
1830         } else {
1831                 if(CURRENT->cmd == WRITE) {
1832                         /* record write error information */
1833                         DRWE->write_errors++;
1834                         if(DRWE->write_errors == 1) {
1835                                 DRWE->first_error_sector = CURRENT->sector;
1836                                 DRWE->first_error_generation = DRS->generation;
1837                         }
1838                         DRWE->last_error_sector = CURRENT->sector;
1839                         DRWE->last_error_generation = DRS->generation;
1840                 }
1841                 end_request(0);
1842         }
1843 }
1844 
1845 /* Interrupt handler evaluating the result of the r/w operation */
1846 static void rw_interrupt(void)
     /*  */
1847 {
1848         int nr_sectors, ssize;
1849 
1850         if ( ! DRS->first_read_date )
1851                 DRS->first_read_date = jiffies;
1852 
1853         nr_sectors = 0;
1854         CODE2SIZE;
1855         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1856                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
1857                         (sector_t % floppy->sect) % ssize;
1858 
1859 #ifdef SANITY
1860         if ( nr_sectors > current_count_sectors + ssize -
1861             (current_count_sectors + sector_t) % ssize +
1862             sector_t % ssize){
1863                 DPRINT2("long rw: %x instead of %lx\n",
1864                         nr_sectors, current_count_sectors);
1865                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
1866                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
1867                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
1868                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
1869                        sector_t, ssize);
1870         }
1871 #endif
1872         if ( nr_sectors < 0 )
1873                 nr_sectors = 0;
1874         if ( nr_sectors < current_count_sectors )
1875                 current_count_sectors = nr_sectors;
1876 
1877         switch (interpret_errors()){
1878         case 2:
1879                 cont->redo();
1880                 return;
1881         case 1:
1882                 if (  !current_count_sectors){
1883                         cont->error();
1884                         cont->redo();
1885                         return;
1886                 }
1887                 break;
1888         case 0:
1889                 if (  !current_count_sectors){
1890                         cont->redo();
1891                         return;
1892                 }
1893                 current_type[current_drive] = floppy;
1894                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1895                         floppy->size >> 1;
1896                 break;
1897         }
1898 
1899         if (probing) {
1900                 if (DP->flags & FTD_MSG)
1901                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
1902                                 floppy->name,current_drive);
1903                 current_type[current_drive] = floppy;
1904                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1905                         floppy->size >> 1;
1906                 probing = 0;
1907         }
1908 
1909         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
1910                 /* transfer directly from buffer */
1911                 cont->done(1);
1912         } else if ( CT(COMMAND) == FD_READ){
1913                 buffer_track = raw_cmd.track;
1914                 buffer_drive = current_drive;
1915                 if ( nr_sectors + sector_t > buffer_max )
1916                         buffer_max = nr_sectors + sector_t;
1917         }
1918         cont->redo();
1919 }
1920 
1921 /* Compute maximal contiguous buffer size. */
1922 static int buffer_chain_size(void)
     /*  */
1923 {
1924         struct buffer_head *bh;
1925         int size;
1926         char *base;
1927 
1928         base = CURRENT->buffer;
1929         size = CURRENT->current_nr_sectors << 9;
1930         bh = CURRENT->bh;
1931 
1932 #ifdef SANITY
1933         if ( !bh ){
1934                 DPRINT("null request in buffer_chain_size\n");
1935                 return size >> 9;
1936         }
1937 #endif
1938 
1939         bh = bh->b_reqnext;
1940         while ( bh && bh->b_data == base + size ){
1941                 size += bh->b_size;
1942                 bh = bh->b_reqnext;
1943         }
1944         return size >> 9;
1945 }
1946 
1947 /* Compute the maximal transfer size */
1948 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
1949 {
1950         if ( max_sector > sector_t + max_size)
1951                 max_sector = sector_t + max_size;
1952 
1953         /* alignment */
1954         max_sector -= (max_sector % floppy->sect ) % ssize;
1955 
1956         /* transfer size, beginning not aligned */
1957         current_count_sectors = max_sector - sector_t ;
1958 
1959         return max_sector;
1960 }
1961 
1962 /*
1963  * Move data from/to the track buffer to/from the buffer cache.
1964  */
1965 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
1966 {
1967         int remaining; /* number of transferred 512-byte sectors */
1968         struct buffer_head *bh;
1969         char *buffer, *dma_buffer;
1970         int size;
1971 
1972         if ( max_sector > max_sector_2 )
1973                 max_sector = max_sector_2;
1974 
1975         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
1976 
1977         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
1978             buffer_max > sector_t + CURRENT->nr_sectors){
1979                 current_count_sectors = buffer_max - sector_t;
1980                 if ( current_count_sectors > CURRENT->nr_sectors )
1981                         current_count_sectors = CURRENT->nr_sectors;
1982         }
1983         remaining = current_count_sectors << 9;
1984 #ifdef SANITY
1985         if ((remaining >> 9) > CURRENT->nr_sectors  && 
1986             CT(COMMAND) == FD_WRITE ){
1987                 DPRINT("in copy buffer\n");
1988                 printk("current_count_sectors=%ld\n", current_count_sectors);
1989                 printk("remaining=%d\n", remaining >> 9);
1990                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
1991                 printk("CURRENT->current_nr_sectors=%ld\n",
1992                        CURRENT->current_nr_sectors);
1993                 printk("max_sector=%d\n", max_sector);
1994                 printk("ssize=%d\n", ssize);
1995         }
1996 #endif
1997 
1998         if ( max_sector > buffer_max )
1999                 buffer_max = max_sector;
2000 
2001         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2002 
2003         bh = CURRENT->bh;
2004         size = CURRENT->current_nr_sectors << 9;
2005         buffer = CURRENT->buffer;
2006 
2007         while ( remaining > 0){
2008                 if ( size > remaining )
2009                         size = remaining;
2010 #ifdef SANITY
2011                 if (!bh){
2012                         DPRINT("bh=null in copy buffer before copy\n");
2013                         break;
2014                 }
2015                 if (dma_buffer + size >
2016                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2017                     dma_buffer < floppy_track_buffer ){
2018                         DPRINT1("buffer overrun in copy buffer %d\n",
2019                                 (floppy_track_buffer - dma_buffer) >>9);
2020                         printk("sector_t=%d buffer_min=%d\n",
2021                                sector_t, buffer_min);
2022                         printk("current_count_sectors=%ld\n",
2023                                current_count_sectors);
2024                         if ( CT(COMMAND) == FD_READ )
2025                                 printk("read\n");
2026                         if ( CT(COMMAND) == FD_READ )
2027                                 printk("write\n");
2028                         break;
2029                 }
2030                 if ( ((int)buffer) % 512 )
2031                         DPRINT1("%p buffer not aligned\n", buffer);
2032 #endif
2033                 if ( CT(COMMAND) == FD_READ )
2034                         memcpy( buffer, dma_buffer, size);
2035                 else
2036                         memcpy( dma_buffer, buffer, size);
2037                 remaining -= size;
2038                 if ( !remaining)
2039                         break;
2040 
2041                 dma_buffer += size;
2042                 bh = bh->b_reqnext;
2043 #ifdef SANITY
2044                 if ( !bh){
2045                         DPRINT("bh=null in copy buffer after copy\n");
2046                         break;
2047                 }
2048 #endif
2049                 size = bh->b_size;
2050                 buffer = bh->b_data;
2051         }
2052 #ifdef SANITY
2053         if ( remaining ){
2054                 if ( remaining > 0 )
2055                         max_sector -= remaining >> 9;
2056                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2057         }
2058 #endif
2059 }
2060 
2061 /*
2062  * Formulate a read/write request.
2063  * this routine decides where to load the data (directly to buffer, or to
2064  * tmp floppy area), how much data to load (the size of the buffer, the whole
2065  * track, or a single sector)
2066  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2067  * allocation on the fly, it should be done here. No other part should need
2068  * modification.
2069  */
2070 
2071 static int make_raw_rw_request(void)
     /*  */
2072 {
2073         int aligned_sector_t;
2074         int max_sector, max_size, tracksize, ssize;
2075 
2076         current_drive = DRIVE(CURRENT->dev);
2077 
2078         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2079                 FD_RAW_NEED_SEEK;
2080         raw_cmd.cmd_count = NR_RW;
2081         if (CURRENT->cmd == READ){
2082                 raw_cmd.flags |= FD_RAW_READ;
2083                 COMMAND = FM_MODE(floppy,FD_READ);
2084         } else if (CURRENT->cmd == WRITE){
2085                 raw_cmd.flags |= FD_RAW_WRITE;
2086                 COMMAND = FM_MODE(floppy,FD_WRITE);
2087         } else {
2088                 DPRINT("make_raw_rw_request: unknown command\n");
2089                 return 0;
2090         }
2091 
2092         max_sector = floppy->sect * floppy->head;
2093         TRACK = CURRENT->sector / max_sector;
2094         sector_t = CURRENT->sector % max_sector;
2095         if ( floppy->track && TRACK >= floppy->track )
2096                 return 0;
2097         HEAD = sector_t / floppy->sect;
2098 
2099         if ( (DRS->flags & FD_NEED_TWADDLE) && sector_t < floppy->sect )
2100                 max_sector = floppy->sect;
2101 
2102         /* 2M disks have phantom sectors on the first track */
2103         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2104                 max_sector = 2 * floppy->sect / 3;
2105                 if (sector_t >= max_sector){
2106                         current_count_sectors =  (floppy->sect - sector_t);
2107                         if ( current_count_sectors > CURRENT->nr_sectors )
2108                                 current_count_sectors = CURRENT->nr_sectors;
2109                         return 1;
2110                 }
2111                 SIZECODE = 2;
2112         } else
2113                 SIZECODE = FD_SIZECODE(floppy);
2114         raw_cmd.rate = floppy->rate & 3;
2115         if ((floppy->rate & FD_2M) &&
2116             (TRACK || HEAD ) &&
2117             raw_cmd.rate == 2)
2118                 raw_cmd.rate = 1;
2119 
2120         if ( SIZECODE )
2121                 SIZECODE2 = 0xff;
2122         else
2123                 SIZECODE2 = 0x80;
2124         raw_cmd.track = TRACK << floppy->stretch;
2125         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
2126         GAP = floppy->gap;
2127         CODE2SIZE;
2128         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2129         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2130         tracksize = floppy->sect - floppy->sect % ssize;
2131         if ( tracksize < floppy->sect ){
2132                 SECT_PER_TRACK ++;
2133                 if (  tracksize <= sector_t % floppy->sect)
2134                         SECTOR--;
2135                 while ( tracksize <= sector_t % floppy->sect){
2136                         while( tracksize + ssize > floppy->sect ){
2137                                 SIZECODE--;
2138                                 ssize >>= 1;
2139                         }
2140                         SECTOR++; SECT_PER_TRACK ++;
2141                         tracksize += ssize;
2142                 }
2143                 max_sector = HEAD * floppy->sect + tracksize;
2144         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2145                 max_sector = floppy->sect;
2146 
2147         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2148         max_size = CURRENT->nr_sectors;
2149         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2150             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2151                 /* data already in track buffer */
2152                 if (CT(COMMAND) == FD_READ) {
2153                         copy_buffer(1, max_sector, buffer_max);
2154                         return 1;
2155                 }
2156         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2157                 if (CT(COMMAND) == FD_WRITE){
2158                         if(sector_t + CURRENT->nr_sectors > ssize &&
2159                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2160                                 max_size = ssize + ssize;
2161                         else
2162                                 max_size = ssize;
2163                 }
2164                 raw_cmd.flags &= ~FD_RAW_WRITE;
2165                 raw_cmd.flags |= FD_RAW_READ;
2166                 COMMAND = FM_MODE(floppy,FD_READ);
2167         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2168                 int direct, indirect;
2169 
2170                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2171                         sector_t;
2172 
2173                 max_size = buffer_chain_size();
2174                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2175                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2176                 /* 64 kb boundaries */
2177                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2178                      ((long) CURRENT->buffer ) / K_64 )
2179                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2180                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2181                 /*
2182                  * We try to read tracks, but if we get too many errors, we
2183                  * go back to reading just one sector at a time.
2184                  *
2185                  * This means we should be able to read a sector even if there
2186                  * are other bad sectors on this track.
2187                  */
2188                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2189                     *errors < DP->max_errors.read_track &&
2190                     /*!(DRS->flags & FD_NEED_TWADDLE) &&*/
2191                     ( ( !probing || (DP->read_track &
2192                            (1 <<DRS->probed_format))))){
2193                         max_size = CURRENT->nr_sectors;
2194                 } else {
2195                         current_addr = CURRENT->buffer;
2196                         raw_cmd.length = current_count_sectors << 9;
2197                         return 2;
2198                 }
2199         }
2200 
2201         if ( CT(COMMAND) == FD_READ )
2202                 max_size = max_sector; /* unbounded */
2203 
2204         /* claim buffer track if needed */
2205         if (buffer_track != raw_cmd.track ||  /* bad track */
2206             buffer_drive !=current_drive || /* bad drive */
2207             sector_t < buffer_min ||
2208             ((CT(COMMAND) == FD_READ ||
2209               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2210              max_sector > 2 * max_buffer_sectors + buffer_min &&
2211              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2212             /* not enough space */ ){
2213                 buffer_track = -1;
2214                 buffer_drive = current_drive;
2215                 buffer_max = buffer_min = aligned_sector_t;
2216         }
2217         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2218 
2219         if ( CT(COMMAND) == FD_WRITE ){
2220                 /* copy write buffer to track buffer.
2221                  * if we get here, we know that the write
2222                  * is either aligned or the data already in the buffer
2223                  * (buffer will be overwritten) */
2224 #ifdef SANITY
2225                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2226                         DPRINT("internal error offset !=0 on write\n");
2227 #endif
2228                 buffer_track = raw_cmd.track;
2229                 buffer_drive = current_drive;
2230                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2231         } else
2232                 transfer_size(ssize, max_sector,
2233                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2234 
2235         /* round up current_count_sectors to get dma xfer size */
2236         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2237         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2238         raw_cmd.length <<= 9;
2239 #ifdef SANITY
2240         if ((raw_cmd.length < current_count_sectors << 9) ||
2241             (current_addr != CURRENT->buffer &&
2242              CT(COMMAND) == FD_WRITE &&
2243              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2244               aligned_sector_t < buffer_min )) ||
2245             raw_cmd.length % ( 128 << SIZECODE ) ||
2246             raw_cmd.length <= 0 || current_count_sectors <= 0){
2247                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2248                         raw_cmd.length, current_count_sectors);
2249                 if ( current_addr != CURRENT->buffer )
2250                         printk("addr=%d, length=%ld\n",
2251                                (current_addr - floppy_track_buffer ) >> 9,
2252                                current_count_sectors);
2253                 printk("st=%d ast=%d mse=%d msi=%d\n",
2254                        sector_t, aligned_sector_t, max_sector, max_size);
2255                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2256                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2257                        COMMAND, SECTOR, HEAD, TRACK);
2258                 printk("buffer drive=%d\n", buffer_drive);
2259                 printk("buffer track=%d\n", buffer_track);
2260                 printk("buffer_min=%d\n", buffer_min );
2261                 printk("buffer_max=%d\n", buffer_max );
2262                 return 0;
2263         }
2264 
2265         if (current_addr != CURRENT->buffer ){
2266                 if (current_addr < floppy_track_buffer ||
2267                     current_count_sectors < 0 ||
2268                     raw_cmd.length < 0 ||
2269                     current_addr + raw_cmd.length >
2270                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2271                         DPRINT("buffer overrun in schedule dma\n");
2272                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2273                                sector_t, buffer_min,
2274                                raw_cmd.length >> 9 );
2275                         printk("current_count_sectors=%ld\n",
2276                                current_count_sectors);
2277                         if ( CT(COMMAND) == FD_READ )
2278                                 printk("read\n");
2279                         if ( CT(COMMAND) == FD_READ )
2280                                 printk("write\n");
2281                         return 0;
2282                 }
2283         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2284                    current_count_sectors > CURRENT->nr_sectors){
2285                 DPRINT("buffer overrun in direct transfer\n");
2286                 return 0;
2287         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2288                 DPRINT("more sectors than bytes\n");
2289                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2290                 printk("sectors=%ld\n", current_count_sectors);
2291         }
2292 #endif
2293         return 2;
2294 }
2295 
2296 static struct cont_t rw_cont={
2297         rw_interrupt,
2298         redo_fd_request,
2299         bad_flp_intr,
2300         request_done };
2301 
2302 static void redo_fd_request(void)
     /*  */
2303 {
2304 #define REPEAT {request_done(0); continue; }
2305         int device;
2306         int tmp;
2307 
2308         if (current_drive < N_DRIVE)
2309                 floppy_off(current_drive);
2310 
2311         if (CURRENT && CURRENT->dev < 0) return;
2312 
2313         cont = &rw_cont;        
2314         while(1){
2315                 if (!CURRENT) {
2316                         CLEAR_INTR;
2317                         unlock_fdc();
2318                         return;
2319                 }
2320                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2321                         panic(DEVICE_NAME ": request list destroyed");
2322                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2323                         panic(DEVICE_NAME ": block not locked");
2324                 
2325                 device = CURRENT->dev;
2326                 set_fdc( DRIVE(device));
2327 
2328                 timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
2329                 timer_active |= 1 << FLOPPY_TIMER;
2330                 raw_cmd.flags=0;
2331                 start_motor();
2332                 if(test_bit( DRIVE(device), &fake_change) ||
2333                    test_bit( DRIVE(device), &changed_floppies)){
2334                         DPRINT("disk absent or changed during operation\n");
2335                         REPEAT;
2336                 }
2337                 set_floppy(device);
2338                 if (!floppy) { /* Autodetection */
2339                         if (!probing){
2340                                 DRS->probed_format = 0;
2341                                 if ( next_valid_format() ){
2342                                         DPRINT("no autodetectable formats\n");
2343                                         floppy = NULL;
2344                                         REPEAT;
2345                                 }
2346                         }
2347                         probing = 1;
2348                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2349                 } else
2350                         probing = 0;
2351                 errors = & (CURRENT->errors);
2352                 tmp = make_raw_rw_request();
2353                 if ( tmp < 2 ){
2354                         request_done(tmp);
2355                         continue;
2356                 }
2357 
2358                 if ( DRS->flags & FD_NEED_TWADDLE )
2359                         twaddle();
2360                 floppy_tq.routine = (void *)(void *) floppy_start;
2361                 queue_task(&floppy_tq, &tq_timer);
2362 #ifdef DEBUGT
2363                 debugt("queue fd request");
2364 #endif
2365                 return;
2366         }
2367 #undef REPEAT
2368 }
2369 
2370 void do_fd_request(void)
     /*  */
2371 {
2372         if (fdc_busy)
2373                 /* fdc busy, this new request will be treated when the
2374                    current one is done */
2375                 return;
2376         /* fdc_busy cannot be set by an interrupt or a bh */
2377         floppy_grab_irq_and_dma();
2378         fdc_busy=1;
2379         redo_fd_request();
2380 }
2381 
2382 /*
2383  * User triggered reset
2384  * ====================
2385  */
2386 
2387 static void reset_intr(void)
     /*  */
2388 {
2389         printk("weird, reset interrupt called\n");
2390 }
2391 
2392 static struct cont_t reset_cont={
2393         reset_intr,
2394         success_and_wakeup,
2395         generic_failure,
2396         generic_done };
2397 
2398 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2399 {
2400         int result;
2401 
2402         result=0;
2403         LOCK_FDC(drive,interruptible);
2404         switch(arg){
2405         case FD_RESET_ALWAYS:
2406                 FDCS->reset=1;
2407                 break;
2408         case FD_RESET_IF_RAWCMD:
2409                 if(FDCS->rawcmd == 2 )
2410                         reset_fdc_info(1);
2411                 break;
2412         }
2413         if ( FDCS->reset ){
2414                 cont = &reset_cont;
2415                 timer_table[FLOPPY_TIMER].expires = jiffies + 5;
2416                 timer_active |= 1 << FLOPPY_TIMER;
2417                 CALL(result=wait_til_done(reset_fdc,interruptible));
2418         }
2419         if ( UDRS->track == PROVEN_ABSENT )
2420                 UDRS->track = NEED_2_RECAL;
2421         redo_fd_request();
2422         return result;
2423 }
2424 
2425 /*
2426  * Misc Ioctl's and support
2427  * ========================
2428  */
2429 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2430 {
2431         int i;
2432 
2433         i = verify_area(VERIFY_WRITE,param,size);
2434         if (i)
2435                 return i;
2436         memcpy_tofs(param,(void *) address, size);
2437         return 0;
2438 }
2439 
2440 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2441 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2442 
2443 static char *drive_name(int type, int drive )
     /*  */
2444 {
2445         struct floppy_struct *floppy;   
2446 
2447         if ( type )
2448                 floppy = floppy_type + type;
2449         else {
2450                 if ( UDP->native_format )
2451                         floppy = floppy_type + UDP->native_format;
2452                 else
2453                         return "(null)";
2454         }
2455         if ( floppy->name )
2456                 return floppy->name;
2457         else
2458                 return "(null)";
2459 }
2460 
2461 /* raw commands */
2462 static struct cont_t raw_cmd_cont={
2463         success_and_wakeup,
2464         failure_and_wakeup,
2465         generic_failure,
2466         generic_done };
2467 
2468 static int raw_cmd_ioctl(int drive, void *param)
     /*  */
2469 {
2470         int i, count, ret;
2471 
2472         if ( FDCS->rawcmd <= 1 )
2473                 FDCS->rawcmd = 1;
2474         for ( i= 0; i < N_DRIVE; i++){
2475                 if ( FDC(i) != fdc)
2476                         continue;
2477                 if ( i == drive ){
2478                         if ( drive_state[i].fd_ref > 1 ){
2479                                 FDCS->rawcmd = 2;
2480                                 break;
2481                         }
2482                 } else if ( drive_state[i].fd_ref ){
2483                         FDCS->rawcmd = 2;
2484                         break;
2485                 }
2486         }
2487 
2488         if(FDCS->reset)
2489                 return -EIO;
2490 
2491         COPYIN(raw_cmd);
2492         raw_cmd.rate &= 0x03;   
2493         count = raw_cmd.length;
2494         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2495                 if(count > max_buffer_sectors * 1024 )
2496                         return -ENOMEM;
2497                 buffer_track = -1;
2498         }
2499         if ( raw_cmd.flags & FD_RAW_WRITE ){
2500                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2501                 if (i)
2502                         return i;
2503                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2504         }
2505 
2506         current_addr = floppy_track_buffer;
2507         cont = &raw_cmd_cont;
2508         CALL(ret=wait_til_done(floppy_start,1));
2509         if( inb_p(FD_DIR) & 0x80 )
2510                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2511         else
2512                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2513         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2514                 motor_off_callback(drive);      
2515 
2516         if ( !ret && !FDCS->reset ){
2517                 raw_cmd.reply_count = inr;
2518                 for( i=0; i< raw_cmd.reply_count; i++)
2519                         raw_cmd.reply[i] = reply_buffer[i];
2520                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2521                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2522         } else
2523                 ret = -EIO;
2524         DRS->track = NO_TRACK;
2525         if ( ret )
2526                 return ret;
2527 
2528         if ( raw_cmd.flags & FD_RAW_READ ){
2529                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2530                 if (i)
2531                         return i;
2532         }
2533        
2534         return COPYOUT(raw_cmd);
2535 }
2536 
2537 static int invalidate_drive(int rdev)
     /*  */
2538 {
2539         /* invalidate the buffer track to force a reread */
2540         set_bit( DRIVE(rdev), &fake_change);
2541         redo_fd_request();
2542         check_disk_change(rdev);
2543         return 0;
2544 }
2545 
2546 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2547     unsigned long param)
2548 {
2549 #define IOCTL_MODE_BIT 8
2550 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2551 
2552         struct floppy_struct newparams;
2553         struct format_descr tmp_format_req;
2554         int i,device,drive,type,cnt;
2555         struct floppy_struct *this_floppy;
2556         char *name;
2557 
2558         device = inode->i_rdev;
2559         switch (cmd) {
2560                 RO_IOCTLS(device,param);
2561         }
2562         type = TYPE(device);
2563         drive = DRIVE(device);
2564         switch (cmd) {
2565         case FDGETDRVTYP:
2566                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2567                 if (i)
2568                         return i;
2569                 name = drive_name(type,drive);
2570                 for ( cnt=0; cnt<16; cnt++){
2571                         put_fs_byte(name[cnt],
2572                                     ((char*)param)+cnt);
2573                         if ( ! *name )
2574                                 break;
2575                 }
2576                 return 0;
2577         case FDGETMAXERRS:
2578                 return COPYOUT(UDP->max_errors);
2579         case FDGETPRM:
2580                 if (type)
2581                         this_floppy = &floppy_type[type];
2582                 else if ((this_floppy = current_type[drive]) ==
2583                          NULL)
2584                         return -ENODEV;
2585                 return COPYOUT(this_floppy[0]);
2586         case FDPOLLDRVSTAT:
2587                 check_disk_change(device);
2588                 /* fall through */
2589         case FDGETDRVSTAT:
2590                 return COPYOUT(*UDRS);
2591         case FDGETFDCSTAT:
2592                 return COPYOUT(*UFDCS);
2593         case FDGETDRVPRM:
2594                 return COPYOUT(*UDP);
2595         case FDWERRORGET:
2596                 return COPYOUT(*UDRWE);
2597         }
2598         if (!IOCTL_ALLOWED)
2599                 return -EPERM;
2600         switch (cmd) {
2601         case FDWERRORCLR:
2602                 UDRWE->write_errors = 0;
2603                 UDRWE->first_error_sector = 0;
2604                 UDRWE->first_error_generation = 0;
2605                 UDRWE->last_error_sector = 0;
2606                 UDRWE->last_error_generation = 0;
2607                 UDRWE->badness = 0;
2608                 return 0;
2609         case FDRAWCMD:
2610                 if (type)
2611                         return -EINVAL;
2612                 LOCK_FDC(drive,1);
2613                 set_floppy(device);
2614                 CALL(i = raw_cmd_ioctl(drive, (void *) param));
2615                 redo_fd_request();
2616                 return i;
2617         case FDFMTTRK:
2618                 if (UDRS->fd_ref != 1)
2619                         return -EBUSY;
2620                 if (UDRS->track == PROVEN_ABSENT)
2621                         return -ENXIO;
2622                 COPYIN(tmp_format_req);
2623                 return do_format(device, &tmp_format_req);
2624         case FDSETMAXERRS:
2625                 return COPYIN(UDP->max_errors);
2626         case FDFMTBEG:
2627                 return 0;
2628         case FDCLRPRM:
2629                 LOCK_FDC(drive,1);
2630                 current_type[drive] = NULL;
2631                 floppy_sizes[drive] = 2;
2632                 UDRS->keep_data = 0;
2633                 return invalidate_drive(device);
2634         case FDFMTEND:
2635         case FDFLUSH:
2636                 LOCK_FDC(drive,1);
2637                 return invalidate_drive(device);
2638         case FDSETPRM:
2639         case FDDEFPRM:
2640                 COPYIN(newparams);
2641                 /* sanity checking for parameters.*/
2642                 if(newparams.sect <= 0 ||
2643                    newparams.head <= 0 ||
2644                    newparams.track <= 0 ||
2645                    newparams.track >
2646                    UDP->tracks>>newparams.stretch)
2647                         return -EINVAL;
2648                 if ( type){
2649                         if ( !suser() )
2650                                 return -EPERM;
2651                         LOCK_FDC(-1,1);
2652                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2653                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2654                                     drive_state[cnt].fd_ref)
2655                                         set_bit(drive, &fake_change);
2656                         }
2657                         floppy_type[type] = newparams;
2658                         floppy_type[type].name="user format";
2659                         for (cnt = type << 2 ;
2660                              cnt < (type << 2 ) + 4 ;
2661                              cnt++)
2662                                 floppy_sizes[cnt]=
2663 #ifdef HAVE_2_CONTROLLERS
2664                                         floppy_sizes[cnt+0x80]=
2665 #endif
2666                                                 floppy_type[type].size>>1;
2667                         redo_fd_request();
2668                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2669                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2670                                     drive_state[cnt].fd_ref)
2671                                         check_disk_change(drive_state[cnt].
2672                                                           fd_device);
2673                         }
2674                         return 0;
2675                 }
2676 
2677                 LOCK_FDC(drive,1);
2678                 if ( cmd != FDDEFPRM ){
2679                         /* notice a disk change immediately, else
2680                          * we loose our settings immediately*/
2681                         raw_cmd.flags = 0;
2682                         start_motor();
2683                 }
2684                 user_params[drive] = newparams;
2685                 if (buffer_drive == drive &&
2686                     buffer_max > user_params[drive].sect)
2687                         buffer_max=user_params[drive].sect;
2688                 current_type[drive] = &user_params[drive];
2689                 floppy_sizes[drive] = user_params[drive].size >> 1;
2690                 if (cmd == FDDEFPRM)
2691                         DRS->keep_data = -1;
2692                 else
2693                         DRS->keep_data = 1;
2694                 /* invalidation. Invalidate only when needed, i.e.
2695                  * when there are already sectors in the buffer cache
2696                  * whose number will change. This is useful, because
2697                  * mtools often changes the geometry of the disk after
2698                  * looking at the boot block */
2699                 if (DRS->maxblock >
2700                     user_params[drive].sect ||
2701                     DRS->maxtrack )
2702                         invalidate_drive(device);
2703                 else
2704                         redo_fd_request();
2705                 return 0;
2706         case FDRESET:
2707                 return user_reset_fdc( drive, (int)param, 1);
2708         case FDMSGON:
2709                 UDP->flags |= FTD_MSG;
2710                 return 0;
2711         case FDMSGOFF:
2712                 UDP->flags &= ~FTD_MSG;
2713                 return 0;
2714         case FDSETEMSGTRESH:
2715                 UDP->max_errors.reporting =
2716                         (unsigned short) (param & 0x0f);
2717                 return 0;
2718         case FDTWADDLE:
2719                 LOCK_FDC(drive,1);
2720                 twaddle();
2721                 redo_fd_request();
2722         }
2723         if ( ! suser() )
2724                 return -EPERM;
2725         switch(cmd){
2726         case FDSETDRVPRM:
2727                 return COPYIN(*UDP);
2728         default:
2729                 return -EINVAL;
2730         }
2731         return 0;
2732 #undef IOCTL_ALLOWED
2733 }
2734 
2735 #define CMOS_READ(addr) ({ \
2736 outb_p(addr,0x70); \
2737 inb_p(0x71); \
2738 })
2739 
2740 static void set_base_type(int drive,int code)
     /*  */
2741 {
2742         if (code > 0 && code <= NUMBER(default_drive_params)) {
2743                 memcpy((char *) UDP,
2744                        (char *) (&default_drive_params[code].params),
2745                        sizeof( struct floppy_drive_params ));
2746                 printk("fd%d is %s", drive, default_drive_params[code].name);
2747                 return;
2748         } else if (!code)
2749                 printk("fd%d is not installed", drive);
2750         else
2751                 printk("fd%d is unknown type %d",drive,code);
2752 }
2753 
2754 static void config_types(void)
     /*  */
2755 {
2756         int drive;
2757 
2758         for (drive=0; drive<N_DRIVE ; drive++){
2759                 /* default type for unidentifiable drives */
2760                 memcpy((char *) UDP, (char *) (&default_drive_params->params),
2761                        sizeof( struct floppy_drive_params ));
2762         }
2763         printk("Floppy drive(s): ");
2764         set_base_type(0, (CMOS_READ(0x10) >> 4) & 15);
2765         if (CMOS_READ(0x10) & 15) {
2766                 printk(", ");
2767                 set_base_type(1, CMOS_READ(0x10) & 15);
2768         }
2769         printk("\n");
2770 }
2771 
2772 int floppy_is_wp( int minor)
     /*  */
2773 {
2774         check_disk_change(minor + (MAJOR_NR << 8));
2775         return ! ( drive_state[ DRIVE(minor) ].flags & FD_DISK_WRITABLE );
2776 }
2777 
2778 
2779 #define WRAPPER(op) \
2780 static int floppy_##op(struct inode * inode, struct file * filp, \
2781                      char * buf, int count) \
2782 { \
2783         check_disk_change(inode->i_rdev); \
2784         if ( drive_state[DRIVE(inode->i_rdev)].track == PROVEN_ABSENT ) \
2785                 return -ENXIO; \
2786         if ( test_bit(DRIVE(inode->i_rdev),&changed_floppies)) \
2787                 return -ENXIO; \
2788         return block_##op(inode, filp, buf, count); \
2789 }
2790 
2791 WRAPPER(read)
     /*  */
2792 WRAPPER(write)
2793 
2794 static void floppy_release(struct inode * inode, struct file * filp)
2795 {
2796         int drive;
2797         
2798         drive = DRIVE(inode->i_rdev);
2799 
2800         fsync_dev(inode->i_rdev);
2801                         
2802         if (UDRS->fd_ref < 0)
2803                 UDRS->fd_ref=0;
2804         else if (!UDRS->fd_ref--) {
2805                 DPRINT("floppy_release with fd_ref == 0");
2806                 UDRS->fd_ref = 0;
2807         }
2808         floppy_release_irq_and_dma();
2809 }
2810 
2811 /*
2812  * floppy_open check for aliasing (/dev/fd0 can be the same as
2813  * /dev/PS0 etc), and disallows simultaneous access to the same
2814  * drive with different device numbers.
2815  */
2816 #define RETERR(x) \
2817         do{floppy_release(inode,filp); \
2818            return -(x);}while(0)
2819 
2820 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2821 {
2822         int drive;
2823         int old_dev;
2824 
2825         if (!filp) {
2826                 DPRINT("Weird, open called with filp=0\n");
2827                 return -EIO;
2828         }
2829 
2830         drive = DRIVE(inode->i_rdev);
2831         if ( drive >= N_DRIVE || !( ALLOWED_DRIVE_MASK & ( 1 << drive)) )
2832                 return -ENXIO;
2833 
2834         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
2835                 return -ENXIO;
2836 
2837         if ((filp->f_mode & 3)  &&
2838             UDRS->track == PROVEN_ABSENT )
2839                 return -ENXIO;
2840 
2841         old_dev = UDRS->fd_device;
2842         if (UDRS->fd_ref && old_dev != inode->i_rdev)
2843                 return -EBUSY;
2844 
2845         if(UDRS->fd_ref == -1 ||
2846            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
2847                 return -EBUSY;
2848 
2849         if (floppy_grab_irq_and_dma())
2850                 return -EBUSY;
2851 
2852         if(filp->f_flags & O_EXCL)
2853                 UDRS->fd_ref = -1;
2854         else
2855                 UDRS->fd_ref++;
2856 
2857         UDRS->fd_device = inode->i_rdev;
2858 
2859         if (old_dev && old_dev != inode->i_rdev) {
2860                 if (buffer_drive == drive)
2861                         buffer_track = -1;
2862                 invalidate_buffers(old_dev);
2863         }
2864 
2865         /* Allow ioctls if we have write-permissions even if read-only open */
2866         if ((filp->f_mode & 2) || permission(inode,2))
2867                 filp->f_mode |= IOCTL_MODE_BIT;
2868 
2869         if (UFDCS->rawcmd == 1)
2870                UFDCS->rawcmd = 2;
2871 
2872         if (filp->f_flags & O_NDELAY)
2873                 return 0;
2874 
2875         if (filp->f_mode && UDRS->track == PROVEN_ABSENT )
2876                 RETERR(ENXIO);
2877 
2878         if (user_reset_fdc(drive, FD_RESET_IF_NEEDED,0))
2879                 RETERR(EIO);
2880 
2881         if (filp->f_mode & 3) {
2882                 UDRS->last_checked = 0;
2883                 check_disk_change(inode->i_rdev);
2884                 if (test_bit(drive,&changed_floppies))
2885                         RETERR(ENXIO);
2886         }
2887         
2888         if (filp->f_mode && UDRS->track == PROVEN_ABSENT )
2889                 RETERR(ENXIO);
2890 
2891         if ((filp->f_mode & 2) && !(UDRS->flags & FD_DISK_WRITABLE))
2892                 RETERR(EROFS);
2893         return 0;
2894 #undef RETERR
2895 }
2896 
2897 /*
2898  * Check if the disk has been changed or if a change has been faked.
2899  */
2900 static int check_floppy_change(dev_t dev)
     /*  */
2901 {
2902         int drive = DRIVE( dev );
2903 
2904         if (MAJOR(dev) != MAJOR_NR) {
2905                 DPRINT("floppy_changed: not a floppy\n");
2906                 return 0;
2907         }
2908 
2909         if(test_bit(drive, &changed_floppies))
2910                 return 1;
2911 
2912         if(UDRS->last_checked + UDP->checkfreq < jiffies){
2913                 lock_fdc(drive,0);
2914                 start_motor();
2915                 redo_fd_request();
2916         }
2917                 
2918         if(test_bit(drive, &changed_floppies))
2919                 return 1;
2920         if(test_bit(drive, &fake_change))
2921                 return 1;
2922         return 0;
2923 }
2924 
2925 static struct cont_t poll_cont={
2926         success_and_wakeup,
2927         floppy_ready,
2928         generic_failure,
2929         generic_done };
2930 
2931 
2932 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
2933  * the bootblock (block 0). "Autodetection" is also needed to check wether
2934  * there is a disk in the drive at all... Thus we also do it for fixed
2935  * geometry formats */
2936 static int floppy_revalidate(dev_t dev)
     /*  */
2937 {
2938         struct buffer_head * bh;
2939         int drive=DRIVE(dev);
2940         int cf;
2941 
2942         cf = test_bit(drive, &changed_floppies);
2943         if(cf || test_bit(drive, &fake_change)){
2944                 lock_fdc(drive,0);
2945                 cf = test_bit(drive, &changed_floppies);
2946                 if(! (cf || test_bit(drive, &fake_change))){
2947                         redo_fd_request(); /* already done by another thread */
2948                         return 0;
2949                 }
2950                 UDRS->maxblock = 0;
2951                 UDRS->maxtrack = 0;
2952                 if ( buffer_drive == drive)
2953                         buffer_track = -1;
2954                 clear_bit(drive, &fake_change);
2955                 clear_bit(drive, &changed_floppies);
2956                 if(cf){
2957                         UDRS->generation++;
2958                         if(!current_type[drive] && !TYPE(dev)){
2959                                 /* auto-sensing */
2960                                 if (!(bh = getblk(dev,0,1024))){
2961                                         redo_fd_request();
2962                                         return 1;
2963                                 }
2964                                 if ( bh && ! bh->b_uptodate)
2965                                         ll_rw_block(READ, 1, &bh);
2966                                 redo_fd_request();
2967                                 wait_on_buffer(bh);
2968                                 brelse(bh);
2969                                 return 0;
2970                         } else {
2971                                 /* no auto-sense, just clear dcl */
2972                                 raw_cmd.flags=FD_RAW_NEED_SEEK|FD_RAW_NEED_DISK;
2973                                 raw_cmd.track=0;
2974                                 raw_cmd.cmd_count=0;
2975                                 cont = &poll_cont;
2976                                 wait_til_done(floppy_ready,0);
2977                         }
2978                 }
2979                 redo_fd_request();
2980         }
2981         return 0;
2982 }
2983 
2984 static struct file_operations floppy_fops = {
2985         NULL,                   /* lseek - default */
2986         floppy_read,            /* read - general block-dev read */
2987         floppy_write,           /* write - general block-dev write */
2988         NULL,                   /* readdir - bad */
2989         NULL,                   /* select */
2990         fd_ioctl,               /* ioctl */
2991         NULL,                   /* mmap */
2992         floppy_open,            /* open */
2993         floppy_release,         /* release */
2994         block_fsync,            /* fsync */
2995         NULL,                   /* fasync */
2996         check_floppy_change,    /* media_change */
2997         floppy_revalidate,      /* revalidate */
2998 };
2999 
3000 /*
3001  * Floppy Driver initialisation
3002  * =============================
3003  */
3004 
3005 /* Determine the floppy disk controller type */
3006 /* This routine was written by David C. Niemi */
3007 static char get_fdc_version(void)
     /*  */
3008 {
3009         int r;
3010 
3011         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3012         if ( FDCS->reset )
3013                 return FDC_NONE;
3014         if ( (r = result()) <= 0x00)
3015                 return FDC_NONE;        /* No FDC present ??? */
3016         if ((r==1) && (reply_buffer[0] == 0x80)){
3017                 printk("FDC %d is a 8272A\n",fdc);
3018                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3019         }
3020         if (r != 10) {
3021                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3022                 return FDC_UNKNOWN;
3023         }
3024         output_byte(FD_VERSION);
3025         r = result();
3026         if ((r == 1) && (reply_buffer[0] == 0x80)){
3027                 printk("FDC %d is a 82072\n",fdc);
3028                 return FDC_82072;               /* 82072 doesn't know VERSION */
3029         }
3030         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3031                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3032                 return FDC_UNKNOWN;
3033         }
3034         output_byte(FD_UNLOCK);
3035         r = result();
3036         if ((r == 1) && (reply_buffer[0] == 0x80)){
3037                 printk("FDC %d is a pre-1991 82077\n", fdc);
3038                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3039         }
3040         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3041                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3042                 return FDC_UNKNOWN;
3043         }
3044         printk("FDC %d is a post-1991 82077\n",fdc);
3045         return FDC_82077;       /* Revised 82077AA passes all the tests */
3046 } /* fdc_init */
3047 
3048 void floppy_init(void)
     /*  */
3049 {
3050         int i;
3051 
3052         sti();
3053 
3054         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3055                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3056                 return;
3057         }
3058 
3059         for(i=0; i<256; i++)
3060                 if ( TYPE(i))
3061                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3062                 else
3063                         floppy_sizes[i] = MAX_DISK_SIZE;
3064 
3065         blk_size[MAJOR_NR] = floppy_sizes;
3066         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3067         timer_table[FLOPPY_TIMER].fn = floppy_shutdown;
3068         timer_active &= ~(1 << FLOPPY_TIMER);
3069         config_types();
3070 
3071         fdc_state[0].address = 0x3f0;
3072 #if N_FDC > 1
3073         fdc_state[1].address = 0x370;
3074 #endif
3075         for (i = 0 ; i < N_FDC ; i++) {
3076                 fdc = i;
3077                 FDCS->dtr = -1;
3078                 FDCS->dor = 0;
3079                 FDCS->reset = 0;
3080                 FDCS->version = FDC_NONE;
3081                 set_dor(fdc, ~0, 0xc );
3082         }
3083 
3084         /* initialise drive state */
3085         for (i = 0; i < N_DRIVE ; i++) {
3086                 current_drive = i;
3087                 DRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE;
3088                 DRS->generation = 0;
3089                 DRS->keep_data = 0;
3090                 DRS->fd_ref = 0;
3091                 DRS->fd_device = 0;
3092                 DRWE->write_errors = 0;
3093                 DRWE->first_error_sector = 0;
3094                 DRWE->first_error_generation = 0;
3095                 DRWE->last_error_sector = 0;
3096                 DRWE->last_error_generation = 0;
3097                 DRWE->badness = 0;
3098         }
3099 
3100         floppy_grab_irq_and_dma();
3101         for (i = 0 ; i < N_FDC ; i++) {
3102                 fdc = i;
3103                 FDCS->rawcmd = 2;
3104                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0))
3105                         continue;
3106                 /* Try to determine the floppy controller type */
3107                 FDCS->version = get_fdc_version();
3108                 if (FDCS->version == FDC_NONE)
3109                         continue;
3110 
3111                 /* Not all FDCs seem to be able to handle the version command
3112                  * properly, so force a reset for the standard FDC clones,
3113                  * to avoid interrupt garbage.
3114                  */
3115                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3116                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3117         }
3118         fdc=0;
3119         current_drive = 0;
3120         floppy_release_irq_and_dma();
3121         initialising=0;
3122 }
3123 
3124 static int floppy_grab_irq_and_dma(void)
     /*  */
3125 {
3126         cli();
3127         if (usage_count++){
3128                 sti();
3129                 return 0;
3130         }
3131         sti();
3132         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
3133                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3134                         FLOPPY_IRQ);
3135                 return -1;
3136         }
3137         if (request_dma(FLOPPY_DMA,"floppy")) {
3138                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3139                         FLOPPY_DMA);
3140                 free_irq(FLOPPY_IRQ);
3141                 return -1;
3142         }
3143         enable_irq(FLOPPY_IRQ);
3144         return 0;
3145 }
3146 
3147 static void floppy_release_irq_and_dma(void)
     /*  */
3148 {
3149         cli();
3150         if (--usage_count){
3151                 sti();
3152                 return;
3153         }
3154         sti();
3155         disable_dma(FLOPPY_DMA);
3156         free_dma(FLOPPY_DMA);
3157         disable_irq(FLOPPY_IRQ);
3158         free_irq(FLOPPY_IRQ);
3159 #ifdef HAVE_2_CONTROLLERS
3160         /* switch on first controller.
3161          * This saves us trouble on the next reboot. */
3162         set_dor(0, ~0, 8 );
3163         set_dor(1, ~8, 0 );
3164 #endif
3165 }
/* */
root/drivers/block/floppy.c

DEFINITIONS
