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,0x00,"h880"  }, /* 20 880KB 5.25"   */
 318         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 319         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"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,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 323         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 324         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 325         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 326 
 327         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"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(jiffies < DP->select_delay + DRS->select_date)
 503                 udelay(20000);
 504 
 505         if(inb_p(FD_DIR) & 0x80){
 506                 UDRS->flags |= FD_VERIFY; /* verify write protection */
 507                 
 508                 if(UDRS->maxblock || /* disk change check */
 509                    !(UDRS->flags & FD_DISK_NEWCHANGE)){/* disk presence check */
 510                         /* mark it changed or absent */
 511                         set_bit(drive,&changed_floppies);
 512 
 513                         /* invalidate its geometry */
 514                         if (UDRS->keep_data >= 0) {
 515                                 if ((DP->flags & FTD_MSG) &&
 516                                     current_type[drive] != NULL)
 517                                         DPRINT("Disk type is undefined after "
 518                                                "disk change\n");
 519                                 current_type[drive] = NULL;
 520                                 floppy_sizes[drive] = MAX_DISK_SIZE;
 521                         }
 522                 }
 523                 UDRS->flags |= FD_DISK_NEWCHANGE;
 524                 return 1;
 525         } else {
 526                 UDRS->last_checked=jiffies;
 527                 UDRS->flags &= ~FD_DISK_NEWCHANGE;
 528                 return 0;
 529         }
 530 }
 531 
 532 static int locked=0;
 533 static int set_dor(int fdc, char mask, char data)
     /*  */
 534 {
 535         register unsigned char drive, unit, newdor,olddor;
 536 
 537         locked=1;
 538         olddor = FDCS->dor;
 539         newdor =  (olddor & mask) | data;
 540         if ( newdor != olddor ){
 541                 unit = olddor & 0x3;
 542                 drive = REVDRIVE(fdc,unit);
 543                 if ( olddor & ( 0x10 << unit ))
 544                         disk_change(drive);
 545                 FDCS->dor = newdor;
 546                 outb_p( newdor, FD_DOR);
 547         }
 548         locked=0;
 549         return olddor;
 550 }
 551 
 552 static void twaddle(void)
     /*  */
 553 {
 554         cli();
 555         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 556         outb_p(FDCS->dor, FD_DOR);
 557         sti();
 558 }
 559 
 560 /* reset all driver information about the current fdc. This is needed after
 561  * a reset, and after a raw command. */
 562 static void reset_fdc_info(int mode)
     /*  */
 563 {
 564         int drive;
 565 
 566         FDCS->spec1 = FDCS->spec2 = -1;
 567         FDCS->need_configure = 1;
 568         FDCS->perp_mode = 1;
 569         FDCS->rawcmd = 0;
 570         for ( drive = 0; drive < N_DRIVE; drive++)
 571                 if (FDC(drive) == fdc &&
 572                     UDRS->track != PROVEN_ABSENT &&
 573                     ( mode || UDRS->track != NEED_1_RECAL))
 574                         UDRS->track = NEED_2_RECAL;
 575 }
 576 
 577 /* selects the fdc and drive, and enables the fdc's input/dma. */
 578 static void set_fdc(int drive)
     /*  */
 579 {
 580         if ( drive >= 0 ){
 581                 fdc = FDC(drive);
 582                 current_drive = drive;
 583         }
 584         set_dor(fdc,~0,8);
 585 #ifdef HAVE_2_CONTROLLERS
 586         set_dor(1-fdc, ~8, 0);
 587 #endif
 588         if ( FDCS->rawcmd == 2 )
 589                 reset_fdc_info(1);
 590         if( inb_p(FD_STATUS) != STATUS_READY )
 591                 FDCS->reset = 1;
 592 }
 593 
 594 static int usage_count = 0;
 595 /* locks the driver */
 596 static int lock_fdc(int drive, int interruptible)
     /*  */
 597 {
 598 
 599         if(!usage_count){
 600                 printk("trying to lock fdc while usage count=0\n");
 601                 return -1;
 602         }
 603         floppy_grab_irq_and_dma();
 604         cli();
 605         while (fdc_busy && NO_SIGNAL)
 606                 interruptible_sleep_on(&fdc_wait);
 607         if(fdc_busy){
 608                 sti();
 609                 return -EINTR;
 610         }
 611         fdc_busy = 1;
 612         sti();
 613         command_status = FD_COMMAND_NONE;
 614         set_fdc(drive);
 615         return 0;
 616 }
 617 
 618 #define LOCK_FDC(drive,interruptible) \
 619 if(lock_fdc(drive,interruptible)) return -EINTR;
 620 
 621 /* unlocks the driver */
 622 static inline void unlock_fdc(void)
     /*  */
 623 {
 624         if (!fdc_busy)
 625                 DPRINT("FDC access conflict!\n");
 626 
 627         if ( DEVICE_INTR )
 628                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 629                         DEVICE_INTR);
 630         command_status = FD_COMMAND_NONE;
 631         timer_active &= ~(1 << FLOPPY_TIMER);
 632         fdc_busy = 0;
 633         floppy_release_irq_and_dma();
 634         wake_up(&fdc_wait);
 635 }
 636 
 637 /* switches the motor off after a given timeout */
 638 static void motor_off_callback(unsigned long nr)
     /*  */
 639 {
 640         unsigned char mask = ~(0x10 << UNIT(nr));
 641 
 642         if(locked)
 643                 floppy_off(nr);
 644         else
 645                 set_dor( FDC(nr), mask, 0 );
 646 }
 647 
 648 static struct timer_list motor_off_timer[N_DRIVE] = {
 649         { NULL, NULL, 0, 0, motor_off_callback },
 650         { NULL, NULL, 0, 1, motor_off_callback },
 651         { NULL, NULL, 0, 2, motor_off_callback },
 652         { NULL, NULL, 0, 3, motor_off_callback }
 653 #ifdef HAVE_2_CONTROLLERS
 654         ,
 655         { NULL, NULL, 0, 4, motor_off_callback },
 656         { NULL, NULL, 0, 5, motor_off_callback },
 657         { NULL, NULL, 0, 6, motor_off_callback },
 658         { NULL, NULL, 0, 7, motor_off_callback }
 659 #endif
 660 };
 661 
 662 /* schedules motor off */
 663 static void floppy_off(unsigned int nr)
     /*  */
 664 {
 665         unsigned long volatile delta;
 666         register int fdc=FDC(nr);
 667 
 668         if( !(FDCS->dor & ( 0x10 << UNIT(nr))))
 669                 return;
 670 
 671         del_timer(motor_off_timer+nr);
 672 
 673         /* make spindle stop in a position which minimizes spinup time
 674          * next time */
 675         if ( drive_params[nr].rps ){
 676                 delta = jiffies - drive_state[nr].first_read_date + HZ -
 677                         drive_params[nr].spindown_offset;
 678                 delta = (( delta * drive_params[nr].rps) % HZ ) /
 679                         drive_params[nr].rps;
 680                 motor_off_timer[nr].expires = drive_params[nr].spindown - delta;
 681         }
 682         add_timer(motor_off_timer+nr);
 683 }
 684 
 685 /*
 686  * cycle through all N_DRIVE floppy drives, for disk change testing.
 687  * stopping at current drive. This is done before any long operation, to
 688  * be sure to have up to date disk change information.
 689  */
 690 static void scandrives(void)
     /*  */
 691 {
 692         int i, drive, saved_drive;
 693 
 694         saved_drive = current_drive % N_DRIVE;
 695         for(i=0; i< N_DRIVE; i++){
 696                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 697                 if ( UDRS->fd_ref == 0 )
 698                         continue; /* skip closed drives */
 699                 set_fdc(drive);
 700                 if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 701                     ((FDCS->dor & 0x3) != UNIT(drive)))
 702                         UDRS->select_date = jiffies;
 703                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 704                       (0x10 << UNIT(drive))))
 705                         /* switch the motor off again, if it was off to
 706                          * begin with */
 707                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 708         }
 709         current_drive = saved_drive;
 710 }
 711 
 712 typedef void (*timeout_fn)(unsigned long);
 713 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 714 
 715 /* this function makes sure that the disk stays in the drive during the
 716  * transfer */
 717 static void fd_watchdog(void)
     /*  */
 718 {
 719         if ( disk_change(current_drive) ){
 720                 DPRINT("disk removed during i/o\n");
 721                 floppy_shutdown();
 722         } else {                
 723                 del_timer(&fd_timer);
 724                 fd_timer.function = (timeout_fn) fd_watchdog;
 725                 fd_timer.expires = 10;
 726                 add_timer(&fd_timer);
 727         }
 728 }
 729 
 730 static void main_command_interrupt(void)
     /*  */
 731 {
 732         del_timer(&fd_timer);
 733         cont->interrupt();
 734 }
 735 
 736 /* waits for a delay (spinup or select) to pass */
 737 static int wait_for_completion(int nr, int delay, timeout_fn function)
     /*  */
 738 {
 739         if ( FDCS->reset ){
 740                 reset_fdc(); /* do the reset during sleep to win time
 741                               * if we don't need to sleep, it's a good
 742                               * occasion anyways */
 743                 return 1;
 744         }
 745 
 746         if ( jiffies < delay ){
 747                 del_timer(&fd_timer);
 748                 fd_timer.function = function;
 749                 fd_timer.expires = delay  - jiffies;
 750                 add_timer(&fd_timer);
 751                 return 1;
 752         }
 753         return 0;
 754 }
 755 
 756 static void setup_DMA(void)
     /*  */
 757 {
 758 #ifdef SANITY
 759         if ((!CURRENT ||
 760              CURRENT->buffer != current_addr ||
 761              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 762             (current_addr < floppy_track_buffer ||
 763              current_addr + raw_cmd.length >
 764              floppy_track_buffer + 1024 * max_buffer_sectors)){
 765                 printk("bad address. start=%p lg=%lx tb=%p\n",
 766                        current_addr, raw_cmd.length, floppy_track_buffer);
 767                 if ( CURRENT ){
 768                         printk("buffer=%p nr=%lx cnr=%lx\n",
 769                                CURRENT->buffer, CURRENT->nr_sectors,
 770                                CURRENT->current_nr_sectors);
 771                 }
 772                 cont->done(0);
 773                 FDCS->reset=1;
 774                 return;
 775         }
 776         if ((long) current_addr % 512 ){
 777                 printk("non aligned address: %p\n", current_addr );
 778                 cont->done(0);
 779                 FDCS->reset=1;
 780                 return;
 781         }
 782         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 783             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 784                 printk("DMA crossing 64-K boundary %p-%p\n",
 785                        current_addr, current_addr + raw_cmd.length);
 786                 cont->done(0);
 787                 FDCS->reset=1;
 788                 return;
 789         }
 790 
 791 #endif
 792         cli();
 793         disable_dma(FLOPPY_DMA);
 794         clear_dma_ff(FLOPPY_DMA);
 795         set_dma_mode(FLOPPY_DMA,
 796                      (raw_cmd.flags & FD_RAW_READ)?
 797                      DMA_MODE_READ : DMA_MODE_WRITE);
 798         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 799         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 800         enable_dma(FLOPPY_DMA);
 801         sti();
 802 }
 803 
 804 /* sends a command byte to the fdc */
 805 static int output_byte(char byte)
     /*  */
 806 {
 807         int counter;
 808         unsigned char status;
 809 
 810         if (FDCS->reset)
 811                 return -1;
 812         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 813                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 814                 if (!(status & STATUS_READY))
 815                         continue;
 816                 if (status == STATUS_READY){
 817                         outb_p(byte,FD_DATA);
 818                         return 0;
 819                 } else
 820                         break;
 821         }
 822         FDCS->reset = 1;
 823         if ( !initialising )
 824                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
 825                         byte, status);
 826         return -1;
 827 }
 828 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 829 
 830 /* gets the response from the fdc */
 831 static int result(void)
     /*  */
 832 {
 833         int i = 0, counter, status;
 834 
 835         if (FDCS->reset)
 836                 return -1;
 837         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 838                 status = inb_p(FD_STATUS)&
 839                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 840                 if (!(status & STATUS_READY))
 841                         continue;
 842                 if (status == STATUS_READY)
 843                         return i;
 844                 if (status & STATUS_DMA )
 845                         break;
 846                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 847                         if (i >= MAX_REPLIES) {
 848                                 DPRINT("floppy_stat reply overrun\n");
 849                                 break;
 850                         }
 851                         reply_buffer[i++] = inb_p(FD_DATA);
 852                 }
 853         }
 854         FDCS->reset = 1;
 855         if ( !initialising )
 856                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
 857                         status, fdc, i);
 858         return -1;
 859 }
 860 
 861 /* Set perpendicular mode as required, based on data rate, if supported.
 862  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 863  */
 864 static inline void perpendicular_mode(void)
     /*  */
 865 {
 866         unsigned char perp_mode;
 867 
 868         if (!floppy)
 869                 return;
 870         if (floppy->rate & 0x40){
 871                 switch(raw_cmd.rate){
 872                 case 0:
 873                         perp_mode=2;
 874                         break;
 875                 case 3:
 876                         perp_mode=3;
 877                         break;
 878                 default:
 879                         DPRINT("Invalid data rate for perpendicular mode!\n");
 880                         cont->done(0);
 881                         FDCS->reset = 1; /* convenient way to return to
 882                                           * redo without to much hassle (deep
 883                                           * stack et al. */
 884                         return;
 885                 }
 886         } else
 887                 perp_mode = 0;
 888                         
 889         if ( FDCS->perp_mode == perp_mode )
 890                 return;
 891         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 892                 output_byte(FD_PERPENDICULAR);
 893                 output_byte(perp_mode);
 894                 FDCS->perp_mode = perp_mode;
 895         } else if (perp_mode) {
 896                 DPRINT("perpendicular mode not supported by this FDC.\n");
 897         }
 898 } /* perpendicular_mode */
 899 
 900 #define NOMINAL_DTR 500
 901 
 902 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
 903  * head load time, and DMA disable flag to values needed by floppy.
 904  *
 905  * The value "dtr" is the data transfer rate in Kbps.  It is needed
 906  * to account for the data rate-based scaling done by the 82072 and 82077
 907  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 908  * 8272a).
 909  *
 910  * Note that changing the data transfer rate has a (probably deleterious)
 911  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
 912  * fdc_specify is called again after each data transfer rate
 913  * change.
 914  *
 915  * srt: 1000 to 16000 in microseconds
 916  * hut: 16 to 240 milliseconds
 917  * hlt: 2 to 254 milliseconds
 918  *
 919  * These values are rounded up to the next highest available delay time.
 920  */
 921 static void fdc_specify(void)
     /*  */
 922 {
 923         unsigned char spec1, spec2;
 924         int srt, hlt, hut;
 925         unsigned long dtr = NOMINAL_DTR;
 926         unsigned long scale_dtr = NOMINAL_DTR;
 927         int hlt_max_code = 0x7f;
 928         int hut_max_code = 0xf;
 929 
 930         if (FDCS->need_configure && FDCS->has_fifo) {
 931                 if ( FDCS->reset )
 932                         return;
 933                 /* Turn on FIFO for 82077-class FDC (improves performance) */
 934                 /* TODO: lock this in via LOCK during initialization */
 935                 output_byte(FD_CONFIGURE);
 936                 output_byte(0);
 937                 output_byte(0x1A);      /* FIFO on, polling off, 10 byte threshold */
 938                 output_byte(0);         /* precompensation from track 0 upwards */
 939                 if ( FDCS->reset ){
 940                         FDCS->has_fifo=0;
 941                         return;
 942                 }
 943                 FDCS->need_configure = 0;
 944                 /*DPRINT("FIFO enabled\n");*/
 945         }
 946 
 947         switch (raw_cmd.rate & 0x03) {
 948         case 3:
 949                 dtr = 1000;
 950                 break;
 951         case 1:
 952                 dtr = 300;
 953                 break;
 954         case 2:
 955                 dtr = 250;
 956                 break;
 957         }
 958 
 959         if (FDCS->version >= FDC_82072) {
 960                 scale_dtr = dtr;
 961                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
 962                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
 963         }
 964 
 965         /* Convert step rate from microseconds to milliseconds and 4 bits */
 966         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 967         if (srt > 0xf)
 968                 srt = 0xf;
 969         else if (srt < 0)
 970                 srt = 0;
 971 
 972         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 973         if (hlt < 0x01)
 974                 hlt = 0x01;
 975         else if (hlt > 0x7f)
 976                 hlt = hlt_max_code;
 977 
 978         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
 979         if (hut < 0x1)
 980                 hut = 0x1;
 981         else if (hut > 0xf)
 982                 hut = hut_max_code;
 983 
 984         spec1 = (srt << 4) | hut;
 985         spec2 = (hlt << 1);
 986 
 987         /* If these parameters did not change, just return with success */
 988         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
 989                 /* Go ahead and set spec1 and spec2 */
 990                 output_byte(FD_SPECIFY);
 991                 output_byte(FDCS->spec1 = spec1);
 992                 output_byte(FDCS->spec2 = spec2);
 993         }
 994 } /* fdc_specify */
 995 
 996 /* Set the FDC's data transfer rate on behalf of the specified drive.
 997  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
 998  * of the specify command (i.e. using the fdc_specify function).
 999  */
1000 static void fdc_dtr(void)
     /*  */
1001 {
1002         /* If data rate not already set to desired value, set it. */
1003         if ( raw_cmd.rate == FDCS->dtr)
1004                 return;
1005         
1006         /* Set dtr */
1007         outb_p(raw_cmd.rate, FD_DCR);
1008         
1009         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1010          * need a stabilization period of several milliseconds to be
1011          * enforced after data rate changes before R/W operations.
1012          * Pause 5 msec to avoid trouble.
1013          */
1014         udelay(5000);
1015         FDCS->dtr = raw_cmd.rate;
1016 } /* fdc_dtr */
1017 
1018 static void tell_sector(void)
     /*  */
1019 {
1020         printk(": track %d, head %d, sector %d, size %d",
1021                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1022 } /* tell_sector */
1023 
1024 
1025 /*
1026  * Ok, this error interpreting routine is called after a
1027  * DMA read/write has succeeded
1028  * or failed, so we check the results, and copy any buffers.
1029  * hhb: Added better error reporting.
1030  * ak: Made this into a separate routine.
1031  */
1032 static int interpret_errors(void)
     /*  */
1033 {
1034         char bad;
1035 
1036         if (inr!=7) {
1037                 DPRINT("-- FDC reply error");
1038                 FDCS->reset = 1;
1039                 return 1;
1040         }
1041 
1042         /* check IC to find cause of interrupt */
1043         switch ((ST0 & ST0_INTR)>>6) {
1044                 case 1: /* error occured during command execution */
1045                         bad = 1;
1046                         if (ST1 & ST1_WP) {
1047                                 DPRINT("Drive is write protected\n");
1048                                 DRS->flags &= ~FD_DISK_WRITABLE;
1049                                 cont->done(0);
1050                                 bad = 2;
1051                         } else if (ST1 & ST1_ND) {
1052                                 DRS->flags |= FD_NEED_TWADDLE;
1053                         } else if (ST1 & ST1_OR) {
1054                                 if (DP->flags & FTD_MSG )
1055                                         DPRINT("Over/Underrun - retrying\n");
1056                                 bad = 0;
1057                         }else if(*errors >= DP->max_errors.reporting){
1058                                 DPRINT("");
1059                                 if (ST0 & ST0_ECE) {
1060                                         printk("Recalibrate failed!");
1061                                 } else if (ST2 & ST2_CRC) {
1062                                         printk("data CRC error");
1063                                         tell_sector();
1064                                 } else if (ST1 & ST1_CRC) {
1065                                         printk("CRC error");
1066                                         tell_sector();
1067                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1068                                         if (!probing) {
1069                                                 printk("sector not found");
1070                                                 tell_sector();
1071                                         } else
1072                                                 printk("probe failed...");
1073                                 } else if (ST2 & ST2_WC) {      /* seek error */
1074                                         printk("wrong cylinder");
1075                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1076                                         printk("bad cylinder");
1077                                 } else {
1078                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1079                                         tell_sector();
1080                                 }
1081                                 printk("\n");
1082 
1083                         }
1084                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1085                                 /* wrong cylinder => recal */
1086                                 DRS->track = NEED_2_RECAL;
1087                         return bad;
1088                 case 2: /* invalid command given */
1089                         DPRINT("Invalid FDC command given!\n");
1090                         cont->done(0);
1091                         return 2;
1092                 case 3:
1093                         DPRINT("Abnormal termination caused by polling\n");
1094                         cont->error();
1095                         return 2;
1096                 default: /* (0) Normal command termination */
1097                         return 0;
1098         }
1099 }
1100 
1101 /*
1102  * This routine is called when everything should be correctly set up
1103  * for the transfer (ie floppy motor is on, the correct floppy is
1104  * selected, and the head is sitting on the right track).
1105  */
1106 static void setup_rw_floppy(void)
     /*  */
1107 {
1108         int i,ready_date,r, flags,dflags;
1109         timeout_fn function;
1110 
1111         flags = raw_cmd.flags;
1112         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1113                 flags |= FD_RAW_INTR;
1114 
1115         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1116                 ready_date = DRS->spinup_date + DP->spinup;             
1117                 /* If spinup will take a long time, rerun scandrives
1118                  * again just before spinup completion. Beware that
1119                  * after scandrives, we must again wait for selection.
1120                  */
1121                 if ( ready_date > jiffies + DP->select_delay){
1122                         ready_date -= DP->select_delay;
1123                         function = (timeout_fn) floppy_start;
1124                 } else
1125                         function = (timeout_fn) setup_rw_floppy;
1126 
1127                 /* wait until the floppy is spinning fast enough */
1128                 if (wait_for_completion(current_drive,ready_date,function))
1129                         return;
1130         }
1131         dflags = DRS->flags;
1132 
1133         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1134                 setup_DMA();
1135         
1136         if ( flags & FD_RAW_INTR )
1137                 SET_INTR(main_command_interrupt);
1138 
1139         r=0;
1140         for(i=0; i< raw_cmd.cmd_count; i++)
1141                 r|=output_byte( raw_cmd.cmd[i] );
1142 
1143 #ifdef DEBUGT
1144         debugt("rw_command: ");
1145 #endif
1146         if ( r ){
1147                 reset_fdc();
1148                 return;
1149         }
1150 
1151         if ( ! ( flags & FD_RAW_INTR )){
1152                 inr = result();
1153                 cont->interrupt();
1154         } else if ( flags & FD_RAW_NEED_DISK )
1155                 fd_watchdog();
1156 }
1157 
1158 #ifdef SILENT_DC_CLEAR
1159 static int blind_seek;
1160 #endif
1161 
1162 /*
1163  * This is the routine called after every seek (or recalibrate) interrupt
1164  * from the floppy controller.
1165  */
1166 static void seek_interrupt(void)
     /*  */
1167 {
1168 #ifdef DEBUGT
1169         debugt("seek interrupt:");
1170 #endif
1171 #ifdef SILENT_DC_CLEAR
1172         set_dor(fdc, ~0,  (0x10 << UNIT(current_drive)));
1173 #endif
1174         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1175                 DPRINT("seek failed\n");
1176                 DRS->track = NEED_2_RECAL;
1177                 cont->error();
1178                 cont->redo();
1179                 return;
1180         }
1181         if (DRS->track >= 0 && DRS->track != ST1    
1182 #ifdef SILENT_DC_CLEAR
1183             && !blind_seek
1184 #endif
1185             )
1186                 DRS->flags &= ~FD_DISK_NEWCHANGE; /* effective seek */
1187         DRS->track = ST1;
1188         DRS->select_date = jiffies;
1189         seek_floppy();
1190 }
1191 
1192 static void check_wp(void)
     /*  */
1193 {
1194         if (DRS->flags & FD_VERIFY) {
1195                 /* check write protection */
1196                 output_byte( FD_GETSTATUS );
1197                 output_byte( UNIT(current_drive) );
1198                 if ( result() != 1 ){
1199                         FDCS->reset = 1;
1200                         return;
1201                 }
1202                 DRS->flags &= ~(FD_VERIFY | FD_DISK_WRITABLE | FD_NEED_TWADDLE);
1203 
1204                 if (!( ST3  & 0x40))
1205                         DRS->flags |= FD_DISK_WRITABLE;
1206         }
1207 }
1208 
1209 static void seek_floppy(void)
     /*  */
1210 {
1211         int track;
1212 
1213 #ifdef SILENT_DC_CLEAR
1214         blind_seek=0;
1215 #endif
1216         disk_change(current_drive);
1217         if ((raw_cmd.flags & FD_RAW_NEED_DISK) &&
1218             test_bit(current_drive,&changed_floppies)){
1219                 /* the media changed flag should be cleared after the seek.
1220                  * If it isn't, this means that there is really no disk in
1221                  * the drive.
1222                  */
1223                 cont->done(0);
1224                 cont->redo();
1225                 return;
1226         }
1227         if ( DRS->track <= NEED_1_RECAL ){
1228                 recalibrate_floppy();
1229                 return;
1230         } else if ((DRS->flags & FD_DISK_NEWCHANGE) &&
1231                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1232                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1233                 /* we seek to clear the media-changed condition. Does anybody
1234                  * know a more elegant way, which works on all drives? */
1235                 if ( raw_cmd.track )
1236                         track = raw_cmd.track - 1;
1237                 else {
1238 #ifdef SILENT_DC_CLEAR
1239                         set_dor(fdc, ~ (0x10 << UNIT(current_drive)), 0);
1240                         blind_seek = 1;
1241 #endif
1242                         track = 1;
1243                 }
1244         } else {
1245                 check_wp();
1246                 if (raw_cmd.track != DRS->track)
1247                         track = raw_cmd.track;
1248                 else {
1249                         setup_rw_floppy();
1250                         return;
1251                 }
1252         }
1253 
1254 #ifndef SILENT_DC_CLEAR
1255         if ( !track && DRS->track >= 0 && DRS->track < 80 ){
1256                 DRS->flags &= ~FD_DISK_NEWCHANGE;
1257                 /* if we go to track 0 anyways, we can just as well use
1258                  * recalibrate */
1259                 recalibrate_floppy();
1260         } else 
1261 #endif
1262         {
1263                 SET_INTR(seek_interrupt);
1264                 output_byte(FD_SEEK);
1265                 output_byte(UNIT(current_drive));
1266                 LAST_OUT(track);
1267 #ifdef DEBUGT
1268                 debugt("seek command:");
1269 #endif
1270         }
1271 }
1272 
1273 static void recal_interrupt(void)
     /*  */
1274 {
1275 #ifdef DEBUGT
1276         debugt("recal interrupt:");
1277 #endif
1278         if (inr !=2 )
1279                 FDCS->reset = 1;
1280         else if (ST0 & ST0_ECE) {
1281                 switch(DRS->track){
1282                 case PROVEN_ABSENT:
1283 #ifdef DEBUGT
1284                         debugt("recal interrupt proven absent:");
1285 #endif
1286                         /* fall through */
1287                 case NEED_1_RECAL:
1288 #ifdef DEBUGT
1289                         debugt("recal interrupt need 1 recal:");
1290 #endif
1291                         /* after a second recalibrate, we still haven't
1292                          * reached track 0. Probably no drive. Raise an
1293                          * error, as failing immediately might upset 
1294                          * computers possessed by the Devil :-) */
1295                         cont->error();
1296                         cont->redo();
1297                         return;
1298                 case NEED_2_RECAL:
1299 #ifdef DEBUGT
1300                         debugt("recal interrupt need 2 recal:");
1301 #endif
1302                         /* If we already did a recalibrate, and we are not at
1303                          * track 0, this means we have moved. (The only way
1304                          * not to move at recalibration is to be already at
1305                          * track 0.) Clear the new change flag
1306                          */
1307                         DRS->flags &= ~FD_DISK_NEWCHANGE;
1308                         /* fall through */
1309                 default:
1310 #ifdef DEBUGT
1311                         debugt("recal interrupt default:");
1312 #endif
1313                         /* Recalibrate moves the head by at most 80 steps. If
1314                          * after one recalibrate we don't have reached track
1315                          * 0, this might mean that we started beyond track 80.
1316                          * Try again.
1317                          */
1318                         DRS->track = NEED_1_RECAL;
1319                         break;
1320                 }
1321         } else
1322                 DRS->track = ST1;
1323         seek_floppy();
1324 }
1325 
1326 /*
1327  * Unexpected interrupt - Print as much debugging info as we can...
1328  * All bets are off...
1329  */
1330 static void unexpected_floppy_interrupt(void)
     /*  */
1331 {
1332         int i;
1333         if ( initialising )
1334                 return;
1335         DPRINT("unexpected interrupt\n");
1336         if ( inr >= 0 )
1337                 for(i=0; i<inr; i++)
1338                         printk("%d %x\n", i, reply_buffer[i] );
1339         while(1){
1340                 output_byte(FD_SENSEI);
1341                 inr=result();
1342                 if ( inr != 2 )
1343                         break;
1344                 printk("sensei\n");
1345                 for(i=0; i<inr; i++)
1346                         printk("%d %x\n", i, reply_buffer[i] );
1347         }
1348         FDCS->reset = 1;
1349 }
1350 
1351 struct tq_struct floppy_tq = 
1352 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1353 
1354 /* interrupt handler */
1355 static void floppy_interrupt(int unused)
     /*  */
1356 {
1357         void (*handler)(void) = DEVICE_INTR;
1358 
1359         CLEAR_INTR;
1360         if ( fdc >= N_FDC ){ /* we don't even know which FDC is the culprit */
1361                 printk("floppy interrupt on bizarre fdc\n");
1362                 return;
1363         }
1364         inr = result();
1365         if (!handler){
1366                 unexpected_floppy_interrupt();
1367                 return;
1368         }
1369         if ( inr == 0 ){
1370                 do {
1371                         output_byte(FD_SENSEI);
1372                         inr = result();
1373                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1374         }
1375         floppy_tq.routine = (void *)(void *) handler;
1376         queue_task_irq(&floppy_tq, &tq_timer);
1377 }
1378 
1379 static void recalibrate_floppy(void)
     /*  */
1380 {
1381 #ifdef DEBUGT
1382         debugt("recalibrate floppy:");
1383 #endif
1384         SET_INTR(recal_interrupt);
1385         output_byte(FD_RECALIBRATE);
1386         LAST_OUT(UNIT(current_drive));
1387 }
1388 
1389 /*
1390  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1391  */
1392 static void reset_interrupt(void)
     /*  */
1393 {
1394 #ifdef DEBUGT
1395         debugt("reset interrupt:");
1396 #endif
1397         fdc_specify();          /* reprogram fdc */
1398         result();               /* get the status ready for set_fdc */
1399         if ( FDCS->reset )
1400                 cont->error(); /* a reset just after a reset. BAD! */
1401         cont->redo();
1402 }
1403 
1404 /*
1405  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1406  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1407  */
1408 static void reset_fdc(void)
     /*  */
1409 {
1410         SET_INTR(reset_interrupt);
1411         FDCS->reset = 0;
1412         reset_fdc_info(0);
1413         if ( FDCS->version >= FDC_82077 )
1414                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1415         else {
1416                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1417                 udelay(FD_RESET_DELAY);
1418                 outb(FDCS->dor, FD_DOR);
1419         }
1420 }
1421 
1422 static void empty(void)
     /*  */
1423 {
1424 }
1425 
1426 void show_floppy(void)
     /*  */
1427 {
1428         int i;
1429 
1430         printk("\n");
1431         printk("floppy driver state\n");
1432         printk("-------------------\n");
1433         for(i=0; i<N_FDC; i++){
1434                 printk("dor %d = %x\n", i, fdc_state[i].dor );
1435                 outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1436                 udelay(1000); /* maybe we'll catch an interrupt... */
1437         }
1438         printk("status=%x\n", inb_p(FD_STATUS));
1439         printk("fdc_busy=%d\n", fdc_busy);
1440         if( DEVICE_INTR)
1441                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1442         if(floppy_tq.sync)
1443                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1444         if(fd_timer.prev)
1445                 printk("fd_timer.function=%p\n", fd_timer.function);
1446         if( timer_active & (1 << FLOPPY_TIMER)){
1447                 printk("timer_table=%p\n",timer_table[FLOPPY_TIMER].fn);
1448                 printk("expires=%ld\n",timer_table[FLOPPY_TIMER].expires);
1449                 printk("now=%ld\n",jiffies);
1450         }
1451         printk("cont=%p\n", cont);
1452         printk("CURRENT=%p\n", CURRENT);
1453         printk("command_status=%d\n", command_status);
1454         printk("\n");
1455 }
1456 
1457 static void floppy_shutdown(void)
     /*  */
1458 {
1459         CLEAR_INTR;
1460         floppy_tq.routine = (void *)(void *) empty;
1461         del_timer( &fd_timer);
1462 
1463         disable_dma(FLOPPY_DMA);
1464         /* avoid dma going to a random drive after shutdown */
1465 
1466         if(!initialising)
1467                 DPRINT("floppy timeout\n");
1468         FDCS->reset = 1;
1469         cont->done(0);
1470         cont->redo(); /* this will recall reset when needed */
1471 }
1472 
1473 /* start motor, check media-changed condition and write protection */
1474 static void start_motor(void)
     /*  */
1475 {
1476         int mask, data;
1477 
1478         mask = 0xfc;
1479         data = UNIT(current_drive);
1480         if ( (FDCS->dor & 0x03) != UNIT(current_drive) ||
1481             !(FDCS->dor & ( 0x10 << UNIT(current_drive) ) ))
1482                 /* notes select time if floppy is not yet selected */
1483                 DRS->select_date = jiffies;
1484 
1485         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1486                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1487                         set_debugt();
1488                         /* no read since this drive is running */
1489                         DRS->first_read_date = 0;
1490                         /* note motor start time if motor is not yet running */
1491                         DRS->spinup_date = jiffies;
1492                         data |= (0x10 << UNIT(current_drive));
1493                 }
1494         } else
1495                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1496                         mask &= ~(0x10 << UNIT(current_drive));
1497 
1498         /* starts motor and selects floppy */
1499         del_timer(motor_off_timer + current_drive);
1500         set_dor( fdc, mask, data);
1501         if( raw_cmd.flags & FD_RAW_NO_MOTOR)
1502                 return;
1503 
1504         disk_change(current_drive);
1505 
1506         return;
1507 }
1508 
1509 static void floppy_ready(void)
     /*  */
1510 {
1511         CHECK_RESET;
1512         start_motor();
1513 
1514         /* wait_for_completion also schedules reset if needed. */
1515         if(wait_for_completion(current_drive,
1516                                DRS->select_date+DP->select_delay,
1517                                (timeout_fn) floppy_ready))
1518                 return;
1519         fdc_dtr();
1520         if ( raw_cmd.flags & FD_RAW_NEED_SEEK ){
1521                 perpendicular_mode();
1522                 fdc_specify(); /* must be done here because of hut, hlt ... */
1523                 seek_floppy();
1524         } else
1525                 setup_rw_floppy();
1526 }
1527 
1528 static void floppy_start(void)
     /*  */
1529 {
1530         timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
1531         timer_active |= 1 << FLOPPY_TIMER;
1532         scandrives();
1533         floppy_ready();
1534 }
1535 
1536 /*
1537  * ========================================================================
1538  * here ends the bottom half. Exported routines are:
1539   * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1540  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1541  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1542  * and set_dor.
1543  * ========================================================================
1544  */
1545 /*
1546  * General purpose continuations.
1547  * ==============================
1548  */
1549 
1550 static void do_wakeup(void)
     /*  */
1551 {
1552         timer_active &= ~(1 << FLOPPY_TIMER);
1553         cont = 0;
1554         command_status += 2;
1555         wake_up(&command_done);
1556 }
1557 
1558 static struct cont_t wakeup_cont={
1559         empty,
1560         do_wakeup,
1561         empty,
1562         (done_f)empty
1563 };
1564 
1565 static int wait_til_done( void (*handler)(void ), int interruptible )
     /*  */
1566 {
1567         int ret;
1568 
1569         floppy_tq.routine = (void *)(void *) handler;
1570         queue_task(&floppy_tq, &tq_timer);
1571 
1572         cli();
1573         while(command_status < 2 && NO_SIGNAL)
1574                 if (current->pid)
1575                         interruptible_sleep_on(&command_done);
1576                 else {
1577                         sti();
1578                         run_task_queue(&tq_timer);
1579                         cli();
1580                 }
1581         if(command_status < 2){
1582                 sti();
1583                 floppy_shutdown();
1584                 redo_fd_request();
1585                 return -EINTR;
1586         }
1587         sti();
1588 
1589         if ( FDCS->reset )
1590                 command_status = FD_COMMAND_ERROR;
1591         if ( command_status == FD_COMMAND_OKAY )
1592                 ret=0;
1593         else
1594                 ret=-EIO;
1595         command_status = FD_COMMAND_NONE;
1596         return ret;
1597 }
1598 
1599 static void generic_done(int result)
     /*  */
1600 {
1601         command_status = result;
1602         cont = &wakeup_cont;
1603 }
1604 
1605 static void generic_success(void)
     /*  */
1606 {
1607         generic_done(1);
1608 }
1609 
1610 static void generic_failure(void)
     /*  */
1611 {
1612         generic_done(0);
1613 }
1614 
1615 static void success_and_wakeup(void)
     /*  */
1616 {
1617         generic_success();
1618         do_wakeup();
1619 }
1620 
1621 static void failure_and_wakeup(void)
     /*  */
1622 {
1623         generic_failure();
1624         do_wakeup();
1625 }
1626 
1627 /*
1628  * formatting and rw support.
1629  * ==========================
1630  */
1631 
1632 static int next_valid_format(void)
     /*  */
1633 {
1634         int probed_format;
1635         while(1){
1636                 probed_format = DRS->probed_format;
1637                 if ( probed_format > N_DRIVE ||
1638                     ! DP->autodetect[probed_format] ){
1639                         DRS->probed_format = 0;
1640                         return 1;
1641                 }
1642                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1643                         DRS->probed_format = probed_format;
1644                         return 0;
1645                 }
1646                 probed_format++;
1647         }
1648 }
1649 
1650 static void bad_flp_intr(void)
     /*  */
1651 {
1652         if ( probing ){
1653                 DRS->probed_format++;
1654                 if ( !next_valid_format())
1655                         return;
1656         }
1657         (*errors)++;
1658         if (*errors > DRWE->badness)
1659                 DRWE->badness = *errors;
1660         if (*errors > DP->max_errors.abort)
1661                 cont->done(0);
1662         if (*errors > DP->max_errors.reset)
1663                 FDCS->reset = 1;
1664         else if (*errors > DP->max_errors.recal)
1665                 DRS->track = NEED_2_RECAL;
1666 }
1667 
1668 static void set_floppy(int device)
     /*  */
1669 {
1670         if (TYPE(device))
1671                 floppy = TYPE(device) + floppy_type;
1672         else
1673                 floppy = current_type[ DRIVE(device) ];
1674 }
1675 
1676 /*
1677  * formatting and support.
1678  * =======================
1679  */
1680 static void format_interrupt(void)
     /*  */
1681 {
1682         switch (interpret_errors()){
1683         case 1:
1684                 cont->error();
1685         case 2:
1686                 break;
1687         case 0:
1688                 cont->done(1);
1689         }
1690         cont->redo();
1691 }
1692 
1693 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
1694 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
1695 #define CT(x) ( (x) | 0x40 )
1696 static void setup_format_params(void)
     /*  */
1697 {
1698         struct fparm {
1699                 unsigned char track,head,sect,size;
1700         } *here = (struct fparm *)floppy_track_buffer;
1701         int il,n;
1702         int count,head_shift,track_shift;
1703 
1704         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1705                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1706         raw_cmd.rate = floppy->rate & 0x3;
1707         raw_cmd.cmd_count = NR_F;
1708         COMMAND = FM_MODE(floppy,FD_FORMAT);
1709         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1710         F_SIZECODE = FD_SIZECODE(floppy);
1711         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1712         F_GAP = floppy->fmt_gap;
1713         F_FILL = FD_FILL_BYTE;
1714 
1715         current_addr = floppy_track_buffer;
1716         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1717 
1718         /* allow for about 30ms for data transport per track */
1719         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1720 
1721         /* a ``cylinder'' is two tracks plus a little stepping time */
1722         track_shift = 2 * head_shift + 1;
1723 
1724         /* position of logical sector 1 on this track */
1725         n = (track_shift * format_req.track + head_shift * format_req.head )
1726                 % F_SECT_PER_TRACK;
1727 
1728         /* determine interleave */
1729         il = 1;
1730         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
1731                 il++;
1732 
1733         /* initialize field */
1734         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1735                 here[count].track = format_req.track;
1736                 here[count].head = format_req.head;
1737                 here[count].sect = 0;
1738                 here[count].size = F_SIZECODE;
1739         }
1740         /* place logical sectors */
1741         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1742                 here[n].sect = count;
1743                 n = (n+il) % F_SECT_PER_TRACK;
1744                 if (here[n].sect) { /* sector busy, find next free sector */
1745                         ++n;
1746                         if (n>= F_SECT_PER_TRACK) {
1747                                 n-=F_SECT_PER_TRACK;
1748                                 while (here[n].sect) ++n;
1749                         }
1750                 }
1751         }
1752 }
1753 
1754 static void redo_format(void)
     /*  */
1755 {
1756         raw_cmd.track = format_req.track << floppy->stretch;
1757         buffer_track = -1;
1758         setup_format_params();
1759         clear_bit(current_drive, &changed_floppies);
1760         floppy_start();
1761 #ifdef DEBUGT
1762         debugt("queue format request");
1763 #endif
1764 }
1765 
1766 static struct cont_t format_cont={
1767         format_interrupt,
1768         redo_format,
1769         bad_flp_intr,
1770         generic_done };
1771 
1772 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1773 {
1774         int okay;
1775 
1776         LOCK_FDC(DRIVE(device),1);
1777         set_floppy(device);
1778         if (!floppy ||
1779             tmp_format_req->track >= floppy->track ||
1780             tmp_format_req->head >= floppy->head){
1781                 redo_fd_request();
1782                 return -EINVAL;
1783         }
1784         format_req = *tmp_format_req;
1785         format_errors = 0;
1786         cont = &format_cont;
1787         errors = &format_errors;
1788         CALL(okay=wait_til_done(redo_format,1));
1789         redo_fd_request();
1790         return okay;
1791 }
1792 
1793 /*
1794  * Buffer read/write and support
1795  * =============================
1796  */
1797 
1798 /* new request_done. Can handle physical sectors which are smaller than a
1799  * logical buffer */
1800 static void request_done(int uptodate)
     /*  */
1801 {
1802         int block;
1803 
1804         probing = 0;
1805         timer_active &= ~(1 << FLOPPY_TIMER);
1806 
1807         if (!CURRENT){
1808                 DPRINT("request list destroyed in floppy request done\n");
1809                 return;
1810         }
1811         if (uptodate){
1812                 /* maintain values for invalidation on geometry
1813                    change */
1814                 block = current_count_sectors + CURRENT->sector;
1815                 if (block > DRS->maxblock)
1816                         DRS->maxblock=block;
1817                 if ( block > floppy->sect)
1818                         DRS->maxtrack = 1;
1819 
1820                 /* unlock chained buffers */
1821                 while (current_count_sectors && CURRENT &&
1822                        current_count_sectors >= CURRENT->current_nr_sectors ){
1823                         current_count_sectors -= CURRENT->current_nr_sectors;
1824                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1825                         CURRENT->sector += CURRENT->current_nr_sectors;
1826                         end_request(1);
1827                 }
1828                 if ( current_count_sectors && CURRENT){
1829                         /* "unlock" last subsector */
1830                         CURRENT->buffer += current_count_sectors <<9;
1831                         CURRENT->current_nr_sectors -= current_count_sectors;
1832                         CURRENT->nr_sectors -= current_count_sectors;
1833                         CURRENT->sector += current_count_sectors;
1834                         return;
1835                 }
1836 
1837                 if ( current_count_sectors && ! CURRENT )
1838                         DPRINT("request list destroyed in floppy request done\n");
1839 
1840         } else {
1841                 if(CURRENT->cmd == WRITE) {
1842                         /* record write error information */
1843                         DRWE->write_errors++;
1844                         if(DRWE->write_errors == 1) {
1845                                 DRWE->first_error_sector = CURRENT->sector;
1846                                 DRWE->first_error_generation = DRS->generation;
1847                         }
1848                         DRWE->last_error_sector = CURRENT->sector;
1849                         DRWE->last_error_generation = DRS->generation;
1850                 }
1851                 end_request(0);
1852         }
1853 }
1854 
1855 /* Interrupt handler evaluating the result of the r/w operation */
1856 static void rw_interrupt(void)
     /*  */
1857 {
1858         int nr_sectors, ssize;
1859 
1860         if ( ! DRS->first_read_date )
1861                 DRS->first_read_date = jiffies;
1862 
1863         nr_sectors = 0;
1864         CODE2SIZE;
1865         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1866                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
1867                         (sector_t % floppy->sect) % ssize;
1868 
1869 #ifdef SANITY
1870         if ( nr_sectors > current_count_sectors + ssize -
1871             (current_count_sectors + sector_t) % ssize +
1872             sector_t % ssize){
1873                 DPRINT2("long rw: %x instead of %lx\n",
1874                         nr_sectors, current_count_sectors);
1875                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
1876                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
1877                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
1878                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
1879                        sector_t, ssize);
1880         }
1881 #endif
1882         if ( nr_sectors < 0 )
1883                 nr_sectors = 0;
1884         if ( nr_sectors < current_count_sectors )
1885                 current_count_sectors = nr_sectors;
1886 
1887         switch (interpret_errors()){
1888         case 2:
1889                 cont->redo();
1890                 return;
1891         case 1:
1892                 if (  !current_count_sectors){
1893                         cont->error();
1894                         cont->redo();
1895                         return;
1896                 }
1897                 break;
1898         case 0:
1899                 if (  !current_count_sectors){
1900                         cont->redo();
1901                         return;
1902                 }
1903                 current_type[current_drive] = floppy;
1904                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1905                         floppy->size >> 1;
1906                 break;
1907         }
1908 
1909         if (probing) {
1910                 if (DP->flags & FTD_MSG)
1911                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
1912                                 floppy->name,current_drive);
1913                 current_type[current_drive] = floppy;
1914                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
1915                         floppy->size >> 1;
1916                 probing = 0;
1917         }
1918 
1919         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
1920                 /* transfer directly from buffer */
1921                 cont->done(1);
1922         } else if ( CT(COMMAND) == FD_READ){
1923                 buffer_track = raw_cmd.track;
1924                 buffer_drive = current_drive;
1925                 if ( nr_sectors + sector_t > buffer_max )
1926                         buffer_max = nr_sectors + sector_t;
1927         }
1928         cont->redo();
1929 }
1930 
1931 /* Compute maximal contiguous buffer size. */
1932 static int buffer_chain_size(void)
     /*  */
1933 {
1934         struct buffer_head *bh;
1935         int size;
1936         char *base;
1937 
1938         base = CURRENT->buffer;
1939         size = CURRENT->current_nr_sectors << 9;
1940         bh = CURRENT->bh;
1941 
1942         if(bh){
1943                 bh = bh->b_reqnext;
1944                 while ( bh && bh->b_data == base + size ){
1945                         size += bh->b_size;
1946                         bh = bh->b_reqnext;
1947                 }
1948         }
1949         return size >> 9;
1950 }
1951 
1952 /* Compute the maximal transfer size */
1953 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
1954 {
1955         if ( max_sector > sector_t + max_size)
1956                 max_sector = sector_t + max_size;
1957 
1958         /* alignment */
1959         max_sector -= (max_sector % floppy->sect ) % ssize;
1960 
1961         /* transfer size, beginning not aligned */
1962         current_count_sectors = max_sector - sector_t ;
1963 
1964         return max_sector;
1965 }
1966 
1967 /*
1968  * Move data from/to the track buffer to/from the buffer cache.
1969  */
1970 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
1971 {
1972         int remaining; /* number of transferred 512-byte sectors */
1973         struct buffer_head *bh;
1974         char *buffer, *dma_buffer;
1975         int size;
1976 
1977         if ( max_sector > max_sector_2 )
1978                 max_sector = max_sector_2;
1979 
1980         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
1981 
1982         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
1983             buffer_max > sector_t + CURRENT->nr_sectors){
1984                 current_count_sectors = buffer_max - sector_t;
1985                 if ( current_count_sectors > CURRENT->nr_sectors )
1986                         current_count_sectors = CURRENT->nr_sectors;
1987         }
1988         remaining = current_count_sectors << 9;
1989 #ifdef SANITY
1990         if ((remaining >> 9) > CURRENT->nr_sectors  && 
1991             CT(COMMAND) == FD_WRITE ){
1992                 DPRINT("in copy buffer\n");
1993                 printk("current_count_sectors=%ld\n", current_count_sectors);
1994                 printk("remaining=%d\n", remaining >> 9);
1995                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
1996                 printk("CURRENT->current_nr_sectors=%ld\n",
1997                        CURRENT->current_nr_sectors);
1998                 printk("max_sector=%d\n", max_sector);
1999                 printk("ssize=%d\n", ssize);
2000         }
2001 #endif
2002 
2003         if ( max_sector > buffer_max )
2004                 buffer_max = max_sector;
2005 
2006         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2007 
2008         bh = CURRENT->bh;
2009         size = CURRENT->current_nr_sectors << 9;
2010         buffer = CURRENT->buffer;
2011 
2012         while ( remaining > 0){
2013                 if ( size > remaining )
2014                         size = remaining;
2015 #ifdef SANITY
2016                 if (dma_buffer + size >
2017                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2018                     dma_buffer < floppy_track_buffer ){
2019                         DPRINT1("buffer overrun in copy buffer %d\n",
2020                                 (floppy_track_buffer - dma_buffer) >>9);
2021                         printk("sector_t=%d buffer_min=%d\n",
2022                                sector_t, buffer_min);
2023                         printk("current_count_sectors=%ld\n",
2024                                current_count_sectors);
2025                         if ( CT(COMMAND) == FD_READ )
2026                                 printk("read\n");
2027                         if ( CT(COMMAND) == FD_READ )
2028                                 printk("write\n");
2029                         break;
2030                 }
2031                 if ( ((int)buffer) % 512 )
2032                         DPRINT1("%p buffer not aligned\n", buffer);
2033 #endif
2034                 if ( CT(COMMAND) == FD_READ )
2035                         memcpy( buffer, dma_buffer, size);
2036                 else
2037                         memcpy( dma_buffer, buffer, size);
2038                 remaining -= size;
2039                 if ( !remaining)
2040                         break;
2041 
2042                 dma_buffer += size;
2043                 bh = bh->b_reqnext;
2044 #ifdef SANITY
2045                 if ( !bh){
2046                         DPRINT("bh=null in copy buffer after copy\n");
2047                         break;
2048                 }
2049 #endif
2050                 size = bh->b_size;
2051                 buffer = bh->b_data;
2052         }
2053 #ifdef SANITY
2054         if ( remaining ){
2055                 if ( remaining > 0 )
2056                         max_sector -= remaining >> 9;
2057                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2058         }
2059 #endif
2060 }
2061 
2062 /*
2063  * Formulate a read/write request.
2064  * this routine decides where to load the data (directly to buffer, or to
2065  * tmp floppy area), how much data to load (the size of the buffer, the whole
2066  * track, or a single sector)
2067  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2068  * allocation on the fly, it should be done here. No other part should need
2069  * modification.
2070  */
2071 
2072 static int make_raw_rw_request(void)
     /*  */
2073 {
2074         int aligned_sector_t;
2075         int max_sector, max_size, tracksize, ssize;
2076 
2077         current_drive = DRIVE(CURRENT->dev);
2078 
2079         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2080                 FD_RAW_NEED_SEEK;
2081         raw_cmd.cmd_count = NR_RW;
2082         if (CURRENT->cmd == READ){
2083                 raw_cmd.flags |= FD_RAW_READ;
2084                 COMMAND = FM_MODE(floppy,FD_READ);
2085         } else if (CURRENT->cmd == WRITE){
2086                 raw_cmd.flags |= FD_RAW_WRITE;
2087                 COMMAND = FM_MODE(floppy,FD_WRITE);
2088         } else {
2089                 DPRINT("make_raw_rw_request: unknown command\n");
2090                 return 0;
2091         }
2092 
2093         max_sector = floppy->sect * floppy->head;
2094         TRACK = CURRENT->sector / max_sector;
2095         sector_t = CURRENT->sector % max_sector;
2096         if ( floppy->track && TRACK >= floppy->track )
2097                 return 0;
2098         HEAD = sector_t / floppy->sect;
2099 
2100         if ( (DRS->flags & FD_NEED_TWADDLE) && sector_t < floppy->sect )
2101                 max_sector = floppy->sect;
2102 
2103         /* 2M disks have phantom sectors on the first track */
2104         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2105                 max_sector = 2 * floppy->sect / 3;
2106                 if (sector_t >= max_sector){
2107                         current_count_sectors =  (floppy->sect - sector_t);
2108                         if ( current_count_sectors > CURRENT->nr_sectors )
2109                                 current_count_sectors = CURRENT->nr_sectors;
2110                         return 1;
2111                 }
2112                 SIZECODE = 2;
2113         } else
2114                 SIZECODE = FD_SIZECODE(floppy);
2115         raw_cmd.rate = floppy->rate & 3;
2116         if ((floppy->rate & FD_2M) &&
2117             (TRACK || HEAD ) &&
2118             raw_cmd.rate == 2)
2119                 raw_cmd.rate = 1;
2120 
2121         if ( SIZECODE )
2122                 SIZECODE2 = 0xff;
2123         else
2124                 SIZECODE2 = 0x80;
2125         raw_cmd.track = TRACK << floppy->stretch;
2126         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
2127         GAP = floppy->gap;
2128         CODE2SIZE;
2129         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2130         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2131         tracksize = floppy->sect - floppy->sect % ssize;
2132         if ( tracksize < floppy->sect ){
2133                 SECT_PER_TRACK ++;
2134                 if (  tracksize <= sector_t % floppy->sect)
2135                         SECTOR--;
2136                 while ( tracksize <= sector_t % floppy->sect){
2137                         while( tracksize + ssize > floppy->sect ){
2138                                 SIZECODE--;
2139                                 ssize >>= 1;
2140                         }
2141                         SECTOR++; SECT_PER_TRACK ++;
2142                         tracksize += ssize;
2143                 }
2144                 max_sector = HEAD * floppy->sect + tracksize;
2145         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2146                 max_sector = floppy->sect;
2147 
2148         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2149         max_size = CURRENT->nr_sectors;
2150         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2151             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2152                 /* data already in track buffer */
2153                 if (CT(COMMAND) == FD_READ) {
2154                         copy_buffer(1, max_sector, buffer_max);
2155                         return 1;
2156                 }
2157         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2158                 if (CT(COMMAND) == FD_WRITE){
2159                         if(sector_t + CURRENT->nr_sectors > ssize &&
2160                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2161                                 max_size = ssize + ssize;
2162                         else
2163                                 max_size = ssize;
2164                 }
2165                 raw_cmd.flags &= ~FD_RAW_WRITE;
2166                 raw_cmd.flags |= FD_RAW_READ;
2167                 COMMAND = FM_MODE(floppy,FD_READ);
2168         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2169                 int direct, indirect;
2170 
2171                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2172                         sector_t;
2173 
2174                 max_size = buffer_chain_size();
2175                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2176                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2177                 /* 64 kb boundaries */
2178                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2179                      ((long) CURRENT->buffer ) / K_64 )
2180                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2181                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2182                 /*
2183                  * We try to read tracks, but if we get too many errors, we
2184                  * go back to reading just one sector at a time.
2185                  *
2186                  * This means we should be able to read a sector even if there
2187                  * are other bad sectors on this track.
2188                  */
2189                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2190                     *errors < DP->max_errors.read_track &&
2191                     /*!(DRS->flags & FD_NEED_TWADDLE) &&*/
2192                     ( ( !probing || (DP->read_track &
2193                            (1 <<DRS->probed_format))))){
2194                         max_size = CURRENT->nr_sectors;
2195                 } else {
2196                         current_addr = CURRENT->buffer;
2197                         raw_cmd.length = current_count_sectors << 9;
2198                         return 2;
2199                 }
2200         }
2201 
2202         if ( CT(COMMAND) == FD_READ )
2203                 max_size = max_sector; /* unbounded */
2204 
2205         /* claim buffer track if needed */
2206         if (buffer_track != raw_cmd.track ||  /* bad track */
2207             buffer_drive !=current_drive || /* bad drive */
2208             sector_t < buffer_min ||
2209             ((CT(COMMAND) == FD_READ ||
2210               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2211              max_sector > 2 * max_buffer_sectors + buffer_min &&
2212              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2213             /* not enough space */ ){
2214                 buffer_track = -1;
2215                 buffer_drive = current_drive;
2216                 buffer_max = buffer_min = aligned_sector_t;
2217         }
2218         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2219 
2220         if ( CT(COMMAND) == FD_WRITE ){
2221                 /* copy write buffer to track buffer.
2222                  * if we get here, we know that the write
2223                  * is either aligned or the data already in the buffer
2224                  * (buffer will be overwritten) */
2225 #ifdef SANITY
2226                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2227                         DPRINT("internal error offset !=0 on write\n");
2228 #endif
2229                 buffer_track = raw_cmd.track;
2230                 buffer_drive = current_drive;
2231                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2232         } else
2233                 transfer_size(ssize, max_sector,
2234                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2235 
2236         /* round up current_count_sectors to get dma xfer size */
2237         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2238         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2239         raw_cmd.length <<= 9;
2240 #ifdef SANITY
2241         if ((raw_cmd.length < current_count_sectors << 9) ||
2242             (current_addr != CURRENT->buffer &&
2243              CT(COMMAND) == FD_WRITE &&
2244              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2245               aligned_sector_t < buffer_min )) ||
2246             raw_cmd.length % ( 128 << SIZECODE ) ||
2247             raw_cmd.length <= 0 || current_count_sectors <= 0){
2248                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2249                         raw_cmd.length, current_count_sectors);
2250                 if ( current_addr != CURRENT->buffer )
2251                         printk("addr=%d, length=%ld\n",
2252                                (current_addr - floppy_track_buffer ) >> 9,
2253                                current_count_sectors);
2254                 printk("st=%d ast=%d mse=%d msi=%d\n",
2255                        sector_t, aligned_sector_t, max_sector, max_size);
2256                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2257                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2258                        COMMAND, SECTOR, HEAD, TRACK);
2259                 printk("buffer drive=%d\n", buffer_drive);
2260                 printk("buffer track=%d\n", buffer_track);
2261                 printk("buffer_min=%d\n", buffer_min );
2262                 printk("buffer_max=%d\n", buffer_max );
2263                 return 0;
2264         }
2265 
2266         if (current_addr != CURRENT->buffer ){
2267                 if (current_addr < floppy_track_buffer ||
2268                     current_count_sectors < 0 ||
2269                     raw_cmd.length < 0 ||
2270                     current_addr + raw_cmd.length >
2271                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2272                         DPRINT("buffer overrun in schedule dma\n");
2273                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2274                                sector_t, buffer_min,
2275                                raw_cmd.length >> 9 );
2276                         printk("current_count_sectors=%ld\n",
2277                                current_count_sectors);
2278                         if ( CT(COMMAND) == FD_READ )
2279                                 printk("read\n");
2280                         if ( CT(COMMAND) == FD_READ )
2281                                 printk("write\n");
2282                         return 0;
2283                 }
2284         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2285                    current_count_sectors > CURRENT->nr_sectors){
2286                 DPRINT("buffer overrun in direct transfer\n");
2287                 return 0;
2288         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2289                 DPRINT("more sectors than bytes\n");
2290                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2291                 printk("sectors=%ld\n", current_count_sectors);
2292         }
2293 #endif
2294         return 2;
2295 }
2296 
2297 static struct cont_t rw_cont={
2298         rw_interrupt,
2299         redo_fd_request,
2300         bad_flp_intr,
2301         request_done };
2302 
2303 static void redo_fd_request(void)
     /*  */
2304 {
2305 #define REPEAT {request_done(0); continue; }
2306         int device;
2307         int tmp;
2308 
2309         if (current_drive < N_DRIVE)
2310                 floppy_off(current_drive);
2311 
2312         if (CURRENT && CURRENT->dev < 0) return;
2313 
2314         cont = &rw_cont;        
2315         while(1){
2316                 if (!CURRENT) {
2317                         CLEAR_INTR;
2318                         unlock_fdc();
2319                         return;
2320                 }
2321                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2322                         panic(DEVICE_NAME ": request list destroyed");
2323                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2324                         panic(DEVICE_NAME ": block not locked");
2325                 
2326                 device = CURRENT->dev;
2327                 set_fdc( DRIVE(device));
2328 
2329                 timer_table[FLOPPY_TIMER].expires = jiffies + DP->timeout;
2330                 timer_active |= 1 << FLOPPY_TIMER;
2331                 raw_cmd.flags=0;
2332                 start_motor();
2333                 if(test_bit( DRIVE(device), &fake_change) ||
2334                    test_bit( DRIVE(device), &changed_floppies)){
2335                         DPRINT("disk absent or changed during operation\n");
2336                         REPEAT;
2337                 }
2338                 set_floppy(device);
2339                 if (!floppy) { /* Autodetection */
2340                         if (!probing){
2341                                 DRS->probed_format = 0;
2342                                 if ( next_valid_format() ){
2343                                         DPRINT("no autodetectable formats\n");
2344                                         floppy = NULL;
2345                                         REPEAT;
2346                                 }
2347                         }
2348                         probing = 1;
2349                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2350                 } else
2351                         probing = 0;
2352                 errors = & (CURRENT->errors);
2353                 tmp = make_raw_rw_request();
2354                 if ( tmp < 2 ){
2355                         request_done(tmp);
2356                         continue;
2357                 }
2358 
2359                 floppy_tq.routine = (void *)(void *) floppy_start;
2360                 queue_task(&floppy_tq, &tq_timer);
2361 #ifdef DEBUGT
2362                 debugt("queue fd request");
2363 #endif
2364                 return;
2365         }
2366 #undef REPEAT
2367 }
2368 
2369 void do_fd_request(void)
     /*  */
2370 {
2371         if (fdc_busy)
2372                 /* fdc busy, this new request will be treated when the
2373                    current one is done */
2374                 return;
2375         /* fdc_busy cannot be set by an interrupt or a bh */
2376         floppy_grab_irq_and_dma();
2377         fdc_busy=1;
2378         redo_fd_request();
2379 }
2380 
2381 /*
2382  * User triggered reset
2383  * ====================
2384  */
2385 
2386 static void reset_intr(void)
     /*  */
2387 {
2388         printk("weird, reset interrupt called\n");
2389 }
2390 
2391 static struct cont_t reset_cont={
2392         reset_intr,
2393         success_and_wakeup,
2394         generic_failure,
2395         generic_done };
2396 
2397 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2398 {
2399         int result;
2400 
2401         result=0;
2402         LOCK_FDC(drive,interruptible);
2403         switch(arg){
2404         case FD_RESET_ALWAYS:
2405                 FDCS->reset=1;
2406                 break;
2407         case FD_RESET_IF_RAWCMD:
2408                 if(FDCS->rawcmd == 2 )
2409                         reset_fdc_info(1);
2410                 break;
2411         }
2412         if ( FDCS->reset ){
2413                 cont = &reset_cont;
2414                 timer_table[FLOPPY_TIMER].expires = jiffies + 5;
2415                 timer_active |= 1 << FLOPPY_TIMER;
2416                 CALL(result=wait_til_done(reset_fdc,interruptible));
2417         }
2418         if ( UDRS->track == PROVEN_ABSENT )
2419                 UDRS->track = NEED_2_RECAL;
2420         redo_fd_request();
2421         return result;
2422 }
2423 
2424 /*
2425  * Misc Ioctl's and support
2426  * ========================
2427  */
2428 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2429 {
2430         int i;
2431 
2432         i = verify_area(VERIFY_WRITE,param,size);
2433         if (i)
2434                 return i;
2435         memcpy_tofs(param,(void *) address, size);
2436         return 0;
2437 }
2438 
2439 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2440 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2441 
2442 static char *drive_name(int type, int drive )
     /*  */
2443 {
2444         struct floppy_struct *floppy;   
2445 
2446         if ( type )
2447                 floppy = floppy_type + type;
2448         else {
2449                 if ( UDP->native_format )
2450                         floppy = floppy_type + UDP->native_format;
2451                 else
2452                         return "(null)";
2453         }
2454         if ( floppy->name )
2455                 return floppy->name;
2456         else
2457                 return "(null)";
2458 }
2459 
2460 /* raw commands */
2461 static struct cont_t raw_cmd_cont={
2462         success_and_wakeup,
2463         failure_and_wakeup,
2464         generic_failure,
2465         generic_done };
2466 
2467 static int raw_cmd_ioctl(int drive, void *param)
     /*  */
2468 {
2469         int i, count, ret;
2470 
2471         if ( FDCS->rawcmd <= 1 )
2472                 FDCS->rawcmd = 1;
2473         for ( i= 0; i < N_DRIVE; i++){
2474                 if ( FDC(i) != fdc)
2475                         continue;
2476                 if ( i == drive ){
2477                         if ( drive_state[i].fd_ref > 1 ){
2478                                 FDCS->rawcmd = 2;
2479                                 break;
2480                         }
2481                 } else if ( drive_state[i].fd_ref ){
2482                         FDCS->rawcmd = 2;
2483                         break;
2484                 }
2485         }
2486 
2487         if(FDCS->reset)
2488                 return -EIO;
2489 
2490         COPYIN(raw_cmd);
2491         raw_cmd.rate &= 0x03;   
2492         count = raw_cmd.length;
2493         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2494                 if(count > max_buffer_sectors * 1024 )
2495                         return -ENOMEM;
2496                 buffer_track = -1;
2497         }
2498         if ( raw_cmd.flags & FD_RAW_WRITE ){
2499                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2500                 if (i)
2501                         return i;
2502                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2503         }
2504 
2505         current_addr = floppy_track_buffer;
2506         cont = &raw_cmd_cont;
2507         CALL(ret=wait_til_done(floppy_start,1));
2508         if( disk_change(current_drive) )
2509                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2510         else
2511                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2512         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2513                 motor_off_callback(drive);      
2514 
2515         if ( !ret && !FDCS->reset ){
2516                 raw_cmd.reply_count = inr;
2517                 for( i=0; i< raw_cmd.reply_count; i++)
2518                         raw_cmd.reply[i] = reply_buffer[i];
2519                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2520                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2521         } else
2522                 ret = -EIO;
2523         DRS->track = NO_TRACK;
2524         if ( ret )
2525                 return ret;
2526 
2527         if ( raw_cmd.flags & FD_RAW_READ ){
2528                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2529                 if (i)
2530                         return i;
2531         }
2532        
2533         return COPYOUT(raw_cmd);
2534 }
2535 
2536 static int invalidate_drive(int rdev)
     /*  */
2537 {
2538         /* invalidate the buffer track to force a reread */
2539         set_bit( DRIVE(rdev), &fake_change);
2540         redo_fd_request();
2541         check_disk_change(rdev);
2542         return 0;
2543 }
2544 
2545 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2546     unsigned long param)
2547 {
2548 #define IOCTL_MODE_BIT 8
2549 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2550 
2551         struct floppy_struct newparams;
2552         struct format_descr tmp_format_req;
2553         int i,device,drive,type,cnt;
2554         struct floppy_struct *this_floppy;
2555         char *name;
2556 
2557         device = inode->i_rdev;
2558         switch (cmd) {
2559                 RO_IOCTLS(device,param);
2560         }
2561         type = TYPE(device);
2562         drive = DRIVE(device);
2563         switch (cmd) {
2564         case FDGETDRVTYP:
2565                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2566                 if (i)
2567                         return i;
2568                 name = drive_name(type,drive);
2569                 for ( cnt=0; cnt<16; cnt++){
2570                         put_fs_byte(name[cnt],
2571                                     ((char*)param)+cnt);
2572                         if ( ! *name )
2573                                 break;
2574                 }
2575                 return 0;
2576         case FDGETMAXERRS:
2577                 return COPYOUT(UDP->max_errors);
2578         case FDGETPRM:
2579                 if (type)
2580                         this_floppy = &floppy_type[type];
2581                 else if ((this_floppy = current_type[drive]) ==
2582                          NULL)
2583                         return -ENODEV;
2584                 return COPYOUT(this_floppy[0]);
2585         case FDPOLLDRVSTAT:
2586                 check_disk_change(device);
2587                 /* fall through */
2588         case FDGETDRVSTAT:
2589                 return COPYOUT(*UDRS);
2590         case FDGETFDCSTAT:
2591                 return COPYOUT(*UFDCS);
2592         case FDGETDRVPRM:
2593                 return COPYOUT(*UDP);
2594         case FDWERRORGET:
2595                 return COPYOUT(*UDRWE);
2596         }
2597         if (!IOCTL_ALLOWED)
2598                 return -EPERM;
2599         switch (cmd) {
2600         case FDWERRORCLR:
2601                 UDRWE->write_errors = 0;
2602                 UDRWE->first_error_sector = 0;
2603                 UDRWE->first_error_generation = 0;
2604                 UDRWE->last_error_sector = 0;
2605                 UDRWE->last_error_generation = 0;
2606                 UDRWE->badness = 0;
2607                 return 0;
2608         case FDRAWCMD:
2609                 if (type)
2610                         return -EINVAL;
2611                 LOCK_FDC(drive,1);
2612                 set_floppy(device);
2613                 CALL(i = raw_cmd_ioctl(drive, (void *) param));
2614                 redo_fd_request();
2615                 return i;
2616         case FDFMTTRK:
2617                 if (UDRS->fd_ref != 1)
2618                         return -EBUSY;
2619                 if (UDRS->track == PROVEN_ABSENT)
2620                         return -ENXIO;
2621                 COPYIN(tmp_format_req);
2622                 return do_format(device, &tmp_format_req);
2623         case FDSETMAXERRS:
2624                 return COPYIN(UDP->max_errors);
2625         case FDFMTBEG:
2626                 return 0;
2627         case FDCLRPRM:
2628                 LOCK_FDC(drive,1);
2629                 current_type[drive] = NULL;
2630                 floppy_sizes[drive] = 2;
2631                 UDRS->keep_data = 0;
2632                 return invalidate_drive(device);
2633         case FDFMTEND:
2634         case FDFLUSH:
2635                 LOCK_FDC(drive,1);
2636                 return invalidate_drive(device);
2637         case FDSETPRM:
2638         case FDDEFPRM:
2639                 COPYIN(newparams);
2640                 /* sanity checking for parameters.*/
2641                 if(newparams.sect <= 0 ||
2642                    newparams.head <= 0 ||
2643                    newparams.track <= 0 ||
2644                    newparams.track >
2645                    UDP->tracks>>newparams.stretch)
2646                         return -EINVAL;
2647                 if ( type){
2648                         if ( !suser() )
2649                                 return -EPERM;
2650                         LOCK_FDC(-1,1);
2651                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2652                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2653                                     drive_state[cnt].fd_ref)
2654                                         set_bit(drive, &fake_change);
2655                         }
2656                         floppy_type[type] = newparams;
2657                         floppy_type[type].name="user format";
2658                         for (cnt = type << 2 ;
2659                              cnt < (type << 2 ) + 4 ;
2660                              cnt++)
2661                                 floppy_sizes[cnt]=
2662 #ifdef HAVE_2_CONTROLLERS
2663                                         floppy_sizes[cnt+0x80]=
2664 #endif
2665                                                 floppy_type[type].size>>1;
2666                         redo_fd_request();
2667                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2668                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2669                                     drive_state[cnt].fd_ref)
2670                                         check_disk_change(drive_state[cnt].
2671                                                           fd_device);
2672                         }
2673                         return 0;
2674                 }
2675 
2676                 LOCK_FDC(drive,1);
2677                 if ( cmd != FDDEFPRM ){
2678                         /* notice a disk change immediately, else
2679                          * we loose our settings immediately*/
2680                         raw_cmd.flags = 0;
2681                         start_motor();
2682                 }
2683                 user_params[drive] = newparams;
2684                 if (buffer_drive == drive &&
2685                     buffer_max > user_params[drive].sect)
2686                         buffer_max=user_params[drive].sect;
2687                 current_type[drive] = &user_params[drive];
2688                 floppy_sizes[drive] = user_params[drive].size >> 1;
2689                 if (cmd == FDDEFPRM)
2690                         DRS->keep_data = -1;
2691                 else
2692                         DRS->keep_data = 1;
2693                 /* invalidation. Invalidate only when needed, i.e.
2694                  * when there are already sectors in the buffer cache
2695                  * whose number will change. This is useful, because
2696                  * mtools often changes the geometry of the disk after
2697                  * looking at the boot block */
2698                 if (DRS->maxblock >
2699                     user_params[drive].sect ||
2700                     DRS->maxtrack )
2701                         invalidate_drive(device);
2702                 else
2703                         redo_fd_request();
2704                 return 0;
2705         case FDRESET:
2706                 return user_reset_fdc( drive, (int)param, 1);
2707         case FDMSGON:
2708                 UDP->flags |= FTD_MSG;
2709                 return 0;
2710         case FDMSGOFF:
2711                 UDP->flags &= ~FTD_MSG;
2712                 return 0;
2713         case FDSETEMSGTRESH:
2714                 UDP->max_errors.reporting =
2715                         (unsigned short) (param & 0x0f);
2716                 return 0;
2717         case FDTWADDLE:
2718                 LOCK_FDC(drive,1);
2719                 twaddle();
2720                 redo_fd_request();
2721         }
2722         if ( ! suser() )
2723                 return -EPERM;
2724         switch(cmd){
2725         case FDSETDRVPRM:
2726                 return COPYIN(*UDP);
2727         default:
2728                 return -EINVAL;
2729         }
2730         return 0;
2731 #undef IOCTL_ALLOWED
2732 }
2733 
2734 #define CMOS_READ(addr) ({ \
2735 outb_p(addr,0x70); \
2736 inb_p(0x71); \
2737 })
2738 
2739 static void set_base_type(int drive,int code)
     /*  */
2740 {
2741         if (code > 0 && code <= NUMBER(default_drive_params)) {
2742                 memcpy((char *) UDP,
2743                        (char *) (&default_drive_params[code].params),
2744                        sizeof( struct floppy_drive_params ));
2745                 printk("fd%d is %s", drive, default_drive_params[code].name);
2746                 return;
2747         } else if (!code)
2748                 printk("fd%d is not installed", drive);
2749         else
2750                 printk("fd%d is unknown type %d",drive,code);
2751 }
2752 
2753 static void config_types(void)
     /*  */
2754 {
2755         int drive;
2756 
2757         for (drive=0; drive<N_DRIVE ; drive++){
2758                 /* default type for unidentifiable drives */
2759                 memcpy((char *) UDP, (char *) (&default_drive_params->params),
2760                        sizeof( struct floppy_drive_params ));
2761         }
2762         printk("Floppy drive(s): ");
2763         set_base_type(0, (CMOS_READ(0x10) >> 4) & 15);
2764         if (CMOS_READ(0x10) & 15) {
2765                 printk(", ");
2766                 set_base_type(1, CMOS_READ(0x10) & 15);
2767         }
2768         printk("\n");
2769 }
2770 
2771 int floppy_is_wp( int minor)
     /*  */
2772 {
2773         check_disk_change(minor + (MAJOR_NR << 8));
2774         return ! ( drive_state[ DRIVE(minor) ].flags & FD_DISK_WRITABLE );
2775 }
2776 
2777 
2778 #define WRAPPER(op) \
2779 static int floppy_##op(struct inode * inode, struct file * filp, \
2780                      char * buf, int count) \
2781 { \
2782         check_disk_change(inode->i_rdev); \
2783         if ( drive_state[DRIVE(inode->i_rdev)].track == PROVEN_ABSENT ) \
2784                 return -ENXIO; \
2785         if ( test_bit(DRIVE(inode->i_rdev),&changed_floppies)) \
2786                 return -ENXIO; \
2787         return block_##op(inode, filp, buf, count); \
2788 }
2789 
2790 WRAPPER(read)
     /*  */
2791 WRAPPER(write)
2792 
2793 static void floppy_release(struct inode * inode, struct file * filp)
2794 {
2795         int drive;
2796         
2797         drive = DRIVE(inode->i_rdev);
2798 
2799         fsync_dev(inode->i_rdev);
2800                         
2801         if (UDRS->fd_ref < 0)
2802                 UDRS->fd_ref=0;
2803         else if (!UDRS->fd_ref--) {
2804                 DPRINT("floppy_release with fd_ref == 0");
2805                 UDRS->fd_ref = 0;
2806         }
2807         floppy_release_irq_and_dma();
2808 }
2809 
2810 /*
2811  * floppy_open check for aliasing (/dev/fd0 can be the same as
2812  * /dev/PS0 etc), and disallows simultaneous access to the same
2813  * drive with different device numbers.
2814  */
2815 #define RETERR(x) \
2816         do{floppy_release(inode,filp); \
2817            return -(x);}while(0)
2818 
2819 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2820 {
2821         int drive;
2822         int old_dev;
2823 
2824         if (!filp) {
2825                 DPRINT("Weird, open called with filp=0\n");
2826                 return -EIO;
2827         }
2828 
2829         drive = DRIVE(inode->i_rdev);
2830         if ( drive >= N_DRIVE || !( ALLOWED_DRIVE_MASK & ( 1 << drive)) )
2831                 return -ENXIO;
2832 
2833         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
2834                 return -ENXIO;
2835 
2836         if ((filp->f_mode & 3)  &&
2837             UDRS->track == PROVEN_ABSENT )
2838                 return -ENXIO;
2839 
2840         old_dev = UDRS->fd_device;
2841         if (UDRS->fd_ref && old_dev != inode->i_rdev)
2842                 return -EBUSY;
2843 
2844         if(UDRS->fd_ref == -1 ||
2845            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
2846                 return -EBUSY;
2847 
2848         if (floppy_grab_irq_and_dma())
2849                 return -EBUSY;
2850 
2851         if(filp->f_flags & O_EXCL)
2852                 UDRS->fd_ref = -1;
2853         else
2854                 UDRS->fd_ref++;
2855 
2856         UDRS->fd_device = inode->i_rdev;
2857 
2858         if (old_dev && old_dev != inode->i_rdev) {
2859                 if (buffer_drive == drive)
2860                         buffer_track = -1;
2861                 invalidate_buffers(old_dev);
2862         }
2863 
2864         /* Allow ioctls if we have write-permissions even if read-only open */
2865         if ((filp->f_mode & 2) || permission(inode,2))
2866                 filp->f_mode |= IOCTL_MODE_BIT;
2867 
2868         if (UFDCS->rawcmd == 1)
2869                UFDCS->rawcmd = 2;
2870 
2871         if (filp->f_flags & O_NDELAY)
2872                 return 0;
2873 
2874         if (filp->f_mode && UDRS->track == PROVEN_ABSENT )
2875                 RETERR(ENXIO);
2876 
2877         if (user_reset_fdc(drive, FD_RESET_IF_NEEDED,0))
2878                 RETERR(EIO);
2879 
2880         if (filp->f_mode & 3) {
2881                 UDRS->last_checked = 0;
2882                 check_disk_change(inode->i_rdev);
2883                 if (test_bit(drive,&changed_floppies))
2884                         RETERR(ENXIO);
2885         }
2886         
2887         if (filp->f_mode && UDRS->track == PROVEN_ABSENT )
2888                 RETERR(ENXIO);
2889 
2890         if ((filp->f_mode & 2) && !(UDRS->flags & FD_DISK_WRITABLE))
2891                 RETERR(EROFS);
2892         return 0;
2893 #undef RETERR
2894 }
2895 
2896 /*
2897  * Check if the disk has been changed or if a change has been faked.
2898  */
2899 static int check_floppy_change(dev_t dev)
     /*  */
2900 {
2901         int drive = DRIVE( dev );
2902 
2903         if (MAJOR(dev) != MAJOR_NR) {
2904                 DPRINT("floppy_changed: not a floppy\n");
2905                 return 0;
2906         }
2907 
2908         if(test_bit(drive, &changed_floppies))
2909                 return 1;
2910 
2911         if(UDRS->last_checked + UDP->checkfreq < jiffies){
2912                 lock_fdc(drive,0);
2913                 start_motor();
2914                 redo_fd_request();
2915         }
2916                 
2917         if(test_bit(drive, &changed_floppies))
2918                 return 1;
2919         if(test_bit(drive, &fake_change))
2920                 return 1;
2921         return 0;
2922 }
2923 
2924 static struct cont_t poll_cont={
2925         success_and_wakeup,
2926         floppy_ready,
2927         generic_failure,
2928         generic_done };
2929 
2930 
2931 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
2932  * the bootblock (block 0). "Autodetection" is also needed to check wether
2933  * there is a disk in the drive at all... Thus we also do it for fixed
2934  * geometry formats */
2935 static int floppy_revalidate(dev_t dev)
     /*  */
2936 {
2937         struct buffer_head * bh;
2938         int drive=DRIVE(dev);
2939         int cf;
2940 
2941         cf = test_bit(drive, &changed_floppies);
2942         if(cf || test_bit(drive, &fake_change)){
2943                 lock_fdc(drive,0);
2944                 cf = test_bit(drive, &changed_floppies);
2945                 if(! (cf || test_bit(drive, &fake_change))){
2946                         redo_fd_request(); /* already done by another thread */
2947                         return 0;
2948                 }
2949                 UDRS->maxblock = 0;
2950                 UDRS->maxtrack = 0;
2951                 if ( buffer_drive == drive)
2952                         buffer_track = -1;
2953                 clear_bit(drive, &fake_change);
2954                 clear_bit(drive, &changed_floppies);
2955                 if(cf){
2956                         UDRS->generation++;
2957                         if(!current_type[drive] && !TYPE(dev)){
2958                                 /* auto-sensing */
2959                                 if (!(bh = getblk(dev,0,1024))){
2960                                         redo_fd_request();
2961                                         return 1;
2962                                 }
2963                                 if ( bh && ! bh->b_uptodate)
2964                                         ll_rw_block(READ, 1, &bh);
2965                                 redo_fd_request();
2966                                 wait_on_buffer(bh);
2967                                 brelse(bh);
2968                                 return 0;
2969                         } else {
2970                                 /* no auto-sense, just clear dcl */
2971                                 raw_cmd.flags=FD_RAW_NEED_SEEK|FD_RAW_NEED_DISK;
2972                                 raw_cmd.track=0;
2973                                 raw_cmd.cmd_count=0;
2974                                 cont = &poll_cont;
2975                                 wait_til_done(floppy_ready,0);
2976                         }
2977                 }
2978                 redo_fd_request();
2979         }
2980         return 0;
2981 }
2982 
2983 static struct file_operations floppy_fops = {
2984         NULL,                   /* lseek - default */
2985         floppy_read,            /* read - general block-dev read */
2986         floppy_write,           /* write - general block-dev write */
2987         NULL,                   /* readdir - bad */
2988         NULL,                   /* select */
2989         fd_ioctl,               /* ioctl */
2990         NULL,                   /* mmap */
2991         floppy_open,            /* open */
2992         floppy_release,         /* release */
2993         block_fsync,            /* fsync */
2994         NULL,                   /* fasync */
2995         check_floppy_change,    /* media_change */
2996         floppy_revalidate,      /* revalidate */
2997 };
2998 
2999 /*
3000  * Floppy Driver initialisation
3001  * =============================
3002  */
3003 
3004 /* Determine the floppy disk controller type */
3005 /* This routine was written by David C. Niemi */
3006 static char get_fdc_version(void)
     /*  */
3007 {
3008         int r;
3009 
3010         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3011         if ( FDCS->reset )
3012                 return FDC_NONE;
3013         if ( (r = result()) <= 0x00)
3014                 return FDC_NONE;        /* No FDC present ??? */
3015         if ((r==1) && (reply_buffer[0] == 0x80)){
3016                 printk("FDC %d is a 8272A\n",fdc);
3017                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3018         }
3019         if (r != 10) {
3020                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3021                 return FDC_UNKNOWN;
3022         }
3023         output_byte(FD_VERSION);
3024         r = result();
3025         if ((r == 1) && (reply_buffer[0] == 0x80)){
3026                 printk("FDC %d is a 82072\n",fdc);
3027                 return FDC_82072;               /* 82072 doesn't know VERSION */
3028         }
3029         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3030                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3031                 return FDC_UNKNOWN;
3032         }
3033         output_byte(FD_UNLOCK);
3034         r = result();
3035         if ((r == 1) && (reply_buffer[0] == 0x80)){
3036                 printk("FDC %d is a pre-1991 82077\n", fdc);
3037                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3038         }
3039         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3040                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3041                 return FDC_UNKNOWN;
3042         }
3043         printk("FDC %d is a post-1991 82077\n",fdc);
3044         return FDC_82077;       /* Revised 82077AA passes all the tests */
3045 } /* fdc_init */
3046 
3047 void floppy_init(void)
     /*  */
3048 {
3049         int i;
3050 
3051         sti();
3052 
3053         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3054                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3055                 return;
3056         }
3057 
3058         for(i=0; i<256; i++)
3059                 if ( TYPE(i))
3060                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3061                 else
3062                         floppy_sizes[i] = MAX_DISK_SIZE;
3063 
3064         blk_size[MAJOR_NR] = floppy_sizes;
3065         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3066         timer_table[FLOPPY_TIMER].fn = floppy_shutdown;
3067         timer_active &= ~(1 << FLOPPY_TIMER);
3068         config_types();
3069 
3070         fdc_state[0].address = 0x3f0;
3071 #if N_FDC > 1
3072         fdc_state[1].address = 0x370;
3073 #endif
3074         for (i = 0 ; i < N_FDC ; i++) {
3075                 fdc = i;
3076                 FDCS->dtr = -1;
3077                 FDCS->dor = 0;
3078                 FDCS->reset = 0;
3079                 FDCS->version = FDC_NONE;
3080                 set_dor(fdc, ~0, 0xc );
3081         }
3082 
3083         /* initialise drive state */
3084         for (i = 0; i < N_DRIVE ; i++) {
3085                 current_drive = i;
3086                 DRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE;
3087                 DRS->generation = 0;
3088                 DRS->keep_data = 0;
3089                 DRS->fd_ref = 0;
3090                 DRS->fd_device = 0;
3091                 DRWE->write_errors = 0;
3092                 DRWE->first_error_sector = 0;
3093                 DRWE->first_error_generation = 0;
3094                 DRWE->last_error_sector = 0;
3095                 DRWE->last_error_generation = 0;
3096                 DRWE->badness = 0;
3097         }
3098 
3099         floppy_grab_irq_and_dma();
3100         for (i = 0 ; i < N_FDC ; i++) {
3101                 fdc = i;
3102                 FDCS->rawcmd = 2;
3103                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0))
3104                         continue;
3105                 /* Try to determine the floppy controller type */
3106                 FDCS->version = get_fdc_version();
3107                 if (FDCS->version == FDC_NONE)
3108                         continue;
3109 
3110                 /* Not all FDCs seem to be able to handle the version command
3111                  * properly, so force a reset for the standard FDC clones,
3112                  * to avoid interrupt garbage.
3113                  */
3114                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3115                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3116         }
3117         fdc=0;
3118         current_drive = 0;
3119         floppy_release_irq_and_dma();
3120         initialising=0;
3121 }
3122 
3123 static int floppy_grab_irq_and_dma(void)
     /*  */
3124 {
3125         int i;
3126         cli();
3127         if (usage_count++){
3128                 sti();
3129                 return 0;
3130         }
3131         sti();
3132 
3133         for(i=0; i< N_FDC; i++){                
3134                 fdc = i;
3135                 reset_fdc_info(1);
3136                 outb_p( FDCS->dor, FD_DOR);
3137         }
3138         set_dor(0, ~0, 8); /* avoid immediate interrupt */
3139 
3140         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
3141                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3142                         FLOPPY_IRQ);
3143                 return -1;
3144         }
3145         if (request_dma(FLOPPY_DMA,"floppy")) {
3146                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3147                         FLOPPY_DMA);
3148                 free_irq(FLOPPY_IRQ);
3149                 return -1;
3150         }
3151         enable_irq(FLOPPY_IRQ);
3152         return 0;
3153 }
3154 
3155 static void floppy_release_irq_and_dma(void)
     /*  */
3156 {
3157         int i;
3158         cli();
3159         if (--usage_count){
3160                 sti();
3161                 return;
3162         }
3163         sti();
3164         disable_dma(FLOPPY_DMA);
3165         free_dma(FLOPPY_DMA);
3166         disable_irq(FLOPPY_IRQ);
3167         free_irq(FLOPPY_IRQ);
3168         /* switch off dma gates */
3169         for(i=0; i< N_FDC; i++)
3170                 set_dor(i, ~8, 0);
3171 }
/* */
root/drivers/block/floppy.c

DEFINITIONS
