drivers/block/floppy.c

/* */
This source file includes following definitions.
set_debugt
debugt
disk_change
is_selected
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
floppy_disable_hlt
floppy_enable_hlt
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
process_fd_request
do_fd_request
poll_drive
reset_intr
user_reset_fdc
fd_copyout
drive_name
raw_cmd_ioctl
invalidate_drive
fd_ioctl
config_types
floppy_read
floppy_write
floppy_release
floppy_open
check_floppy_change
floppy_revalidate
get_fdc_version
floppy_invert_dcl
daring
allow_drives
fdc2_adr
unex
set_cmos
floppy_setup
new_floppy_init
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  * 02.12.91 - Changed to static variables to indicate need for reset
   9  * and recalibrate. This makes some things easier (output_byte reset
  10  * checking etc), and means less interrupt jumping in case of errors,
  11  * so the code is hopefully easier to understand.
  12  */
  13 
  14 /*
  15  * This file is certainly a mess. I've tried my best to get it working,
  16  * but I don't like programming floppies, and I have only one anyway.
  17  * Urgel. I should check for more errors, and do more graceful error
  18  * recovery. Seems there are problems with several drives. I've tried to
  19  * correct them. No promises.
  20  */
  21 
  22 /*
  23  * As with hd.c, all routines within this file can (and will) be called
  24  * by interrupts, so extreme caution is needed. A hardware interrupt
  25  * handler may not sleep, or a kernel panic will happen. Thus I cannot
  26  * call "floppy-on" directly, but have to set a special timer interrupt
  27  * etc.
  28  */
  29 
  30 /*
  31  * 28.02.92 - made track-buffering routines, based on the routines written
  32  * by entropy@wintermute.wpi.edu (Lawrence Foard). Linus.
  33  */
  34 
  35 /*
  36  * Automatic floppy-detection and formatting written by Werner Almesberger
  37  * (almesber@nessie.cs.id.ethz.ch), who also corrected some problems with
  38  * the floppy-change signal detection.
  39  */
  40 
  41 /*
  42  * 1992/7/22 -- Hennus Bergman: Added better error reporting, fixed
  43  * FDC data overrun bug, added some preliminary stuff for vertical
  44  * recording support.
  45  *
  46  * 1992/9/17: Added DMA allocation & DMA functions. -- hhb.
  47  *
  48  * TODO: Errors are still not counted properly.
  49  */
  50 
  51 /* 1992/9/20
  52  * Modifications for ``Sector Shifting'' by Rob Hooft (hooft@chem.ruu.nl)
  53  * modelled after the freeware MS/DOS program fdformat/88 V1.8 by
  54  * Christoph H. Hochst\"atter.
  55  * I have fixed the shift values to the ones I always use. Maybe a new
  56  * ioctl() should be created to be able to modify them.
  57  * There is a bug in the driver that makes it impossible to format a
  58  * floppy as the first thing after bootup.
  59  */
  60 
  61 /*
  62  * 1993/4/29 -- Linus -- cleaned up the timer handling in the kernel, and
  63  * this helped the floppy driver as well. Much cleaner, and still seems to
  64  * work.
  65  */
  66 
  67 /* 1994/6/24 --bbroad-- added the floppy table entries and made
  68  * minor modifications to allow 2.88 floppies to be run.
  69  */
  70 
  71 /* 1994/7/13 -- Paul Vojta -- modified the probing code to allow three or more
  72  * disk types.
  73  */
  74 
  75 /*
  76  * 1994/8/8 -- Alain Knaff -- Switched to fdpatch driver: Support for bigger
  77  * format bug fixes, but unfortunately some new bugs too...
  78  */
  79 
  80 /* 1994/9/17 -- Koen Holtman -- added logging of physical floppy write 
  81  * errors to allow safe writing by specialized programs.
  82  */
  83 
  84 #define CONFIG_FLOPPY_SANITY
  85 #undef  CONFIG_FLOPPY_SILENT_DCL_CLEAR
  86 
  87 #define REALLY_SLOW_IO
  88 
  89 #define DEBUGT 2
  90 #define DCL_DEBUG /* debug disk change line */
  91 
  92 #include <linux/config.h>
  93 
  94 /* do print messages for unexpected interrupts */
  95 static int print_unex=1;
  96 
  97 #ifndef FD_MODULE
  98 /* the following is the mask of allowed drives. By default units 2 and
  99  * 3 of both floppy controllers are disabled, because switching on the
 100  * motor of these drives causes system hangs on some PCI computers. drive
 101  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 102  * a drive is allowed. */
 103 static int ALLOWED_DRIVE_MASK=0x33;
 104 
 105 #define FLOPPY_IRQ 6
 106 #define FLOPPY_DMA 2
 107 #define FDC1 0x3f0
 108 static int FDC2=-1;
 109 #endif
 110 
 111 #define MODULE_AWARE_DRIVER
 112 
 113 #include <linux/sched.h>
 114 #include <linux/fs.h>
 115 #include <linux/kernel.h>
 116 #include <linux/timer.h>
 117 #include <linux/tqueue.h>
 118 #define FDPATCHES
 119 #include <linux/fdreg.h>
 120 #include <linux/fd.h>
 121 #include <linux/errno.h>
 122 #include <linux/malloc.h>
 123 #include <linux/string.h>
 124 #include <linux/fcntl.h>
 125 #include <linux/delay.h>
 126 #include <linux/mc146818rtc.h> /* CMOS defines */
 127 
 128 #include <asm/dma.h>
 129 #include <asm/irq.h>
 130 #include <asm/system.h>
 131 #include <asm/io.h>
 132 #include <asm/segment.h>
 133 
 134 #define MAJOR_NR FLOPPY_MAJOR
 135 #include "blk.h"
 136 
 137 static unsigned int fake_change = 0;
 138 static int initialising=1;
 139 
 140 #define FLOPPY0_TYPE    ((CMOS_READ(0x10) >> 4) & 15)
 141 #define FLOPPY1_TYPE    (CMOS_READ(0x10) & 15)
 142 
 143 /*
 144  * Again, the CMOS information doesn't work on the alpha..
 145  */
 146 #ifdef __alpha__
 147 #undef FLOPPY0_TYPE
 148 #undef FLOPPY1_TYPE
 149 #define FLOPPY0_TYPE 6
 150 #define FLOPPY1_TYPE 0
 151 #endif
 152 
 153 #define N_FDC 2
 154 #define N_DRIVE 8
 155 
 156 #define TYPE(x) ( ((x)>>2) & 0x1f )
 157 #define DRIVE(x) ( ((x)&0x03) | (((x)&0x80 ) >> 5))
 158 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 159 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 160 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 161                                 /* reverse mapping from unit and fdc to drive */
 162 #define DP (&drive_params[current_drive])
 163 #define DRS (&drive_state[current_drive])
 164 #define DRWE (&write_errors[current_drive])
 165 #define FDCS (&fdc_state[fdc])
 166 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 167 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 168 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 169 
 170 #define UDP (&drive_params[drive])
 171 #define UDRS (&drive_state[drive])
 172 #define UDRWE (&write_errors[drive])
 173 #define UFDCS (&fdc_state[FDC(drive)])
 174 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 175 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 176 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 177 
 178 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 179 
 180 #define DPRINT1(x,x1) \
 181 printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 182 
 183 #define DPRINT2(x,x1,x2) \
 184 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 185 
 186 #define DPRINT3(x,x1,x2,x3) \
 187 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 188 
 189 /* read/write */
 190 #define COMMAND raw_cmd.cmd[0]
 191 #define DR_SELECT raw_cmd.cmd[1]
 192 #define TRACK raw_cmd.cmd[2]
 193 #define HEAD raw_cmd.cmd[3]
 194 #define SECTOR raw_cmd.cmd[4]
 195 #define SIZECODE raw_cmd.cmd[5]
 196 #define SECT_PER_TRACK raw_cmd.cmd[6]
 197 #define GAP raw_cmd.cmd[7]
 198 #define SIZECODE2 raw_cmd.cmd[8]
 199 #define NR_RW 9
 200 
 201 /* format */
 202 #define F_SIZECODE raw_cmd.cmd[2]
 203 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 204 #define F_GAP raw_cmd.cmd[4]
 205 #define F_FILL raw_cmd.cmd[5]
 206 #define NR_F 6
 207 
 208 /*
 209  * Maximum disk size (in kilobytes). This default is used whenever the
 210  * current disk size is unknown.
 211  * [Now it is rather a minimum]
 212  */
 213 #define MAX_DISK_SIZE 2 /* 3984*/
 214 
 215 
 216 
 217 /*
 218  * The DMA channel used by the floppy controller cannot access data at
 219  * addresses >= 16MB
 220  *
 221  * Went back to the 1MB limit, as some people had problems with the floppy
 222  * driver otherwise. It doesn't matter much for performance anyway, as most
 223  * floppy accesses go through the track buffer.
 224  */
 225 #define LAST_DMA_ADDR   (0x1000000)
 226 #define K_64 (0x10000) /* 64 k */
 227 
 228 /*
 229  * globals used by 'result()'
 230  */
 231 #define MAX_REPLIES 10
 232 static unsigned char reply_buffer[MAX_REPLIES];
 233 static int inr; /* size of reply buffer, when called from interrupt */
 234 #define ST0 (reply_buffer[0])
 235 #define ST1 (reply_buffer[1])
 236 #define ST2 (reply_buffer[2])
 237 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 238 #define R_TRACK (reply_buffer[3])
 239 #define R_HEAD (reply_buffer[4])
 240 #define R_SECTOR (reply_buffer[5])
 241 #define R_SIZECODE (reply_buffer[6])
 242 
 243 #define SEL_DLY (2*HZ/100)
 244 
 245 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 246 /*
 247  * this struct defines the different floppy drive types.
 248  */
 249 static struct {
 250         struct floppy_drive_params params;
 251         char *name; /* name printed while booting */
 252 } default_drive_params[]= {
 253 /* NOTE: the time values in jiffies should be in msec!
 254  CMOS drive type
 255   |     Maximum data rate supported by drive type
 256   |     |   Head load time, msec
 257   |     |   |   Head unload time, msec (not used)
 258   |     |   |   |     Step rate interval, usec
 259   |     |   |   |     |       Time needed for spinup time (jiffies)
 260   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 261   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 262   |     |   |   |     |       |      |   |     Select delay
 263   |     |   |   |     |       |      |   |     |     RPS
 264   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 265   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 266   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 267   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 268 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 269       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 270 
 271 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 272       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 273 
 274 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 275       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 276 
 277 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 278       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 279 
 280 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 281       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 282 
 283 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 284       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 285 
 286 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 287       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 288 /*    |  ---autodetected formats--   |      |      |
 289       read_track                     |      |    Name printed when booting
 290                                      |     Native format
 291                                    Frequency of disk change checks */
 292 };
 293 
 294 static struct floppy_drive_params drive_params[N_DRIVE];
 295 static struct floppy_drive_struct drive_state[N_DRIVE];
 296 static struct floppy_write_errors write_errors[N_DRIVE];
 297 static struct floppy_raw_cmd raw_cmd;
 298 
 299 /*
 300  * This struct defines the different floppy types.
 301  *
 302  * The 'stretch' tells if the tracks need to be doubled for some
 303  * types (ie 360kB diskette in 1.2MB drive etc). Others should
 304  * be self-explanatory.
 305  */
 306 static struct floppy_struct floppy_type[32] = {
 307         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 308         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 309         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 310         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 311         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 312         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 313         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 314         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 315         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 316         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 317 
 318         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 319         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 320         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 321         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 322         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 323         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 324         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 325         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 326         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 327         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 328 
 329         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 330         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 331         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 332         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 333         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 334         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 335         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 336         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 337         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 338 
 339         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 340         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 341         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 342 };
 343 
 344 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 345 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 346 
 347 /* Auto-detection: Disk type used until the next media change occurs. */
 348 struct floppy_struct *current_type[N_DRIVE] = {
 349         NULL, NULL, NULL, NULL,
 350         NULL, NULL, NULL, NULL
 351 };
 352 
 353 /*
 354  * User-provided type information. current_type points to
 355  * the respective entry of this array.
 356  */
 357 struct floppy_struct user_params[N_DRIVE];
 358 
 359 static int floppy_sizes[256];
 360 static int floppy_blocksizes[256] = { 0, };
 361 
 362 /*
 363  * The driver is trying to determine the correct media format
 364  * while probing is set. rw_interrupt() clears it after a
 365  * successful access.
 366  */
 367 static int probing = 0;
 368 
 369 /* Synchronization of FDC access. */
 370 #define FD_COMMAND_DETECT -2
 371 #define FD_COMMAND_NONE -1
 372 #define FD_COMMAND_ERROR 2
 373 #define FD_COMMAND_OKAY 3
 374 
 375 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 376 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 377 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 378 #define CALL(x) if( (x) == -EINTR) return -EINTR;
 379 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 380 #define WAIT(x) _WAIT((x),interruptible)
 381 #define IWAIT(x) _WAIT((x),1)
 382 
 383 /* Errors during formatting are counted here. */
 384 static int format_errors;
 385 
 386 /* Format request descriptor. */
 387 static struct format_descr format_req;
 388 
 389 /*
 390  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 391  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 392  * H is head unload time (1=16ms, 2=32ms, etc)
 393  */
 394 
 395 /*
 396  * Track buffer
 397  * Because these are written to by the DMA controller, they must
 398  * not contain a 64k byte boundary crossing, or data will be
 399  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 400  * Note that you must not change the sizes below without updating head.S.
 401  */
 402 extern char floppy_track_buffer[512*2*MAX_BUFFER_SECTORS];
 403 #define max_buffer_sectors MAX_BUFFER_SECTORS
 404 
 405 int *errors;
 406 typedef void (*done_f)(int);
 407 struct cont_t {
 408 void (*interrupt)(void); /* this is called after the interrupt of the
 409                           * main command */
 410 void (*redo)(void); /* this is called to retry the operation */
 411 void (*error)(void); /* this is called to tally an error */
 412 done_f done; /* this is called to say if the operation has succeeded/failed */
 413 } *cont;
 414 
 415 static void floppy_ready(void);
 416 static void floppy_start(void);
 417 static void process_fd_request(void);
 418 static void recalibrate_floppy(void);
 419 static void floppy_shutdown(void);
 420 
 421 static int floppy_grab_irq_and_dma(void);
 422 static void floppy_release_irq_and_dma(void);
 423 
 424 /*
 425  * The "reset" variable should be tested whenever an interrupt is scheduled,
 426  * after the commands have been sent. This is to ensure that the driver doesn't
 427  * get wedged when the interrupt doesn't come because of a failed command.
 428  * reset doesn't need to be tested before sending commands, because
 429  * output_byte is automatically disabled when reset is set.
 430  */
 431 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 432 static void reset_fdc(void);
 433 
 434 /*
 435  * These are global variables, as that's the easiest way to give
 436  * information to interrupts. They are the data used for the current
 437  * request.
 438  */
 439 #define NO_TRACK -1
 440 #define NEED_1_RECAL -2
 441 #define NEED_2_RECAL -3
 442 
 443 /* */
 444 static int usage_count = 0;
 445 
 446 
 447 /* buffer related variables */
 448 static int buffer_track = -1;
 449 static int buffer_drive = -1;
 450 static int buffer_min = -1;
 451 static int buffer_max = -1;
 452 
 453 /* fdc related variables, should end up in a struct */
 454 static struct floppy_fdc_state fdc_state[N_FDC];
 455 static int fdc; /* current fdc */
 456 
 457 static struct floppy_struct * floppy = floppy_type;
 458 static unsigned char current_drive = 0;
 459 static long current_count_sectors = 0;
 460 static char *current_addr = 0;
 461 static unsigned char sector_t; /* sector in track */
 462 
 463 #ifdef DEBUGT
 464 long unsigned debugtimer;
 465 #endif
 466 
 467 /*
 468  * Debugging
 469  * =========
 470  */
 471 static inline void set_debugt(void)
     /*  */
 472 {
 473 #ifdef DEBUGT
 474         debugtimer = jiffies;
 475 #endif
 476 }
 477 
 478 static inline void debugt(char *message)
     /*  */
 479 {
 480 #ifdef DEBUGT
 481   if ( DP->flags & DEBUGT )
 482         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 483 #endif
 484 }
 485 
 486 /*
 487  * Bottom half floppy driver.
 488  * ==========================
 489  *
 490  * This part of the file contains the code talking directly to the hardware,
 491  * and also the main service loop (seek-configure-spinup-command)
 492  */
 493 
 494 /*
 495  * disk change.
 496  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 497  * and the last_checked date.
 498  *
 499  * last_checked is the date of the last check which showed 'no disk change'
 500  * FD_DISK_CHANGE is set under two conditions:
 501  * 1. The floppy has been changed after some i/o to that floppy already
 502  *    took place.
 503  * 2. No floppy disk is in the drive. This is done in order to ensure that
 504  *    requests are quickly flushed in case there is no disk in the drive. It
 505  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 506  *    the drive.
 507  *
 508  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 509  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 510  *  each seek. If a disk is present, the disk change line should also be
 511  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 512  *  change line is set, this means either that no disk is in the drive, or
 513  *  that it has been removed since the last seek.
 514  *
 515  * This means that we really have a third possibility too:
 516  *  The floppy has been changed after the last seek.
 517  */
 518 
 519 static int disk_change(int drive)
     /*  */
 520 {
 521         int fdc=FDC(drive);
 522 #ifdef CONFIG_FLOPPY_SANITY
 523         if(jiffies < UDP->select_delay + UDRS->select_date)
 524                 DPRINT("WARNING disk change called early\n");
 525         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 526            (FDCS->dor & 3) != UNIT(drive) ||
 527            fdc != FDC(drive)){
 528                 DPRINT("probing disk change on unselected drive\n");
 529                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 530                         FDCS->dor);
 531         }
 532 #endif
 533 
 534 #ifdef DCL_DEBUG
 535         if (UDP->flags & FD_DEBUG){
 536                 DPRINT1("checking disk change line for drive %d\n",drive);
 537                 DPRINT1("jiffies=%ld\n", jiffies);
 538                 DPRINT1("disk change line=%x\n",inb_p(FD_DIR)&0x80);
 539                 DPRINT1("flags=%x\n",UDRS->flags);
 540         }
 541 #endif
 542         if (UDP->flags & FD_BROKEN_DCL)
 543                 return UTESTF(FD_DISK_CHANGED);
 544         if( (inb_p(FD_DIR) ^ UDP->flags) & 0x80){
 545                 USETF(FD_VERIFY); /* verify write protection */         
 546                 if(UDRS->maxblock){
 547                         /* mark it changed */
 548                         USETF(FD_DISK_CHANGED);
 549 
 550                         /* invalidate its geometry */
 551                         if (UDRS->keep_data >= 0) {
 552                                 if ((UDP->flags & FTD_MSG) &&
 553                                     current_type[drive] != NULL)
 554                                         DPRINT("Disk type is undefined after "
 555                                                "disk change\n");
 556                                 current_type[drive] = NULL;
 557                                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] = MAX_DISK_SIZE;
 558                         }
 559                 }
 560                 /*USETF(FD_DISK_NEWCHANGE);*/
 561                 return 1;
 562         } else {
 563                 UDRS->last_checked=jiffies;
 564                 UCLEARF(FD_DISK_NEWCHANGE);
 565         }
 566         return 0;
 567 }
 568 
 569 static inline int is_selected(int dor, int unit)
     /*  */
 570 {
 571         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 572 }
 573 
 574 static int set_dor(int fdc, char mask, char data)
     /*  */
 575 {
 576         register unsigned char drive, unit, newdor,olddor;
 577 
 578         if(FDCS->address == -1)
 579                 return -1;
 580 
 581         olddor = FDCS->dor;
 582         newdor =  (olddor & mask) | data;
 583         if ( newdor != olddor ){
 584                 unit = olddor & 0x3;
 585                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 586                         drive = REVDRIVE(fdc,unit);
 587 #ifdef DCL_DEBUG
 588         if (UDP->flags & FD_DEBUG){
 589                 DPRINT("calling disk change from set_dor\n");
 590         }
 591 #endif
 592                         disk_change(drive);
 593                 }
 594                 FDCS->dor = newdor;
 595                 outb_p(newdor, FD_DOR);
 596 
 597                 unit = newdor & 0x3;
 598                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 599                         drive = REVDRIVE(fdc,unit);
 600                         UDRS->select_date = jiffies;
 601                 }
 602         }
 603         if ( newdor & 0xf0 )
 604                 floppy_grab_irq_and_dma();
 605         if( olddor & 0xf0 )
 606                 floppy_release_irq_and_dma();
 607         return olddor;
 608 }
 609 
 610 static void twaddle(void)
     /*  */
 611 {
 612         if (DP->select_delay)
 613                 return;
 614         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 615         outb_p(FDCS->dor, FD_DOR);
 616         DRS->select_date = jiffies;
 617 }
 618 
 619 /* reset all driver information about the current fdc. This is needed after
 620  * a reset, and after a raw command. */
 621 static void reset_fdc_info(int mode)
     /*  */
 622 {
 623         int drive;
 624 
 625         FDCS->spec1 = FDCS->spec2 = -1;
 626         FDCS->need_configure = 1;
 627         FDCS->perp_mode = 1;
 628         FDCS->rawcmd = 0;
 629         for ( drive = 0; drive < N_DRIVE; drive++)
 630                 if (FDC(drive) == fdc &&
 631                     ( mode || UDRS->track != NEED_1_RECAL))
 632                         UDRS->track = NEED_2_RECAL;
 633 }
 634 
 635 /* selects the fdc and drive, and enables the fdc's input/dma. */
 636 static void set_fdc(int drive)
     /*  */
 637 {
 638         if (drive >= 0 && drive < N_DRIVE){
 639                 fdc = FDC(drive);
 640                 current_drive = drive;
 641         }
 642         set_dor(fdc,~0,8);
 643         set_dor(1-fdc, ~8, 0);
 644         if ( FDCS->rawcmd == 2 )
 645                 reset_fdc_info(1);
 646         if( inb_p(FD_STATUS) != STATUS_READY )
 647                 FDCS->reset = 1;
 648 }
 649 
 650 /* locks the driver */
 651 static int lock_fdc(int drive, int interruptible)
     /*  */
 652 {
 653         if(!usage_count){
 654                 printk("trying to lock fdc while usage count=0\n");
 655                 return -1;
 656         }
 657         floppy_grab_irq_and_dma();
 658         if (!current->pid)
 659                 run_task_queue(&tq_timer);
 660         cli();
 661         while (fdc_busy && NO_SIGNAL)
 662                 interruptible_sleep_on(&fdc_wait);
 663         if(fdc_busy){
 664                 sti();
 665                 return -EINTR;
 666         }
 667         fdc_busy = 1;
 668         sti();
 669         command_status = FD_COMMAND_NONE;
 670         set_fdc(drive);
 671         return 0;
 672 }
 673 
 674 #define LOCK_FDC(drive,interruptible) \
 675 if(lock_fdc(drive,interruptible)) return -EINTR;
 676 
 677 typedef void (*timeout_fn)(unsigned long);
 678 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0, 
 679                                                (timeout_fn) floppy_shutdown };
 680 
 681 /* unlocks the driver */
 682 static inline void unlock_fdc(void)
     /*  */
 683 {
 684         if (!fdc_busy)
 685                 DPRINT("FDC access conflict!\n");
 686 
 687         if ( DEVICE_INTR )
 688                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 689                         DEVICE_INTR);
 690         command_status = FD_COMMAND_NONE;
 691         del_timer(&fd_timeout);
 692         fdc_busy = 0;
 693         floppy_release_irq_and_dma();
 694         wake_up(&fdc_wait);
 695 }
 696 
 697 /* switches the motor off after a given timeout */
 698 static void motor_off_callback(unsigned long nr)
     /*  */
 699 {
 700         unsigned char mask = ~(0x10 << UNIT(nr));
 701 
 702         set_dor( FDC(nr), mask, 0 );
 703 }
 704 
 705 static struct timer_list motor_off_timer[N_DRIVE] = {
 706         { NULL, NULL, 0, 0, motor_off_callback },
 707         { NULL, NULL, 0, 1, motor_off_callback },
 708         { NULL, NULL, 0, 2, motor_off_callback },
 709         { NULL, NULL, 0, 3, motor_off_callback },
 710         { NULL, NULL, 0, 4, motor_off_callback },
 711         { NULL, NULL, 0, 5, motor_off_callback },
 712         { NULL, NULL, 0, 6, motor_off_callback },
 713         { NULL, NULL, 0, 7, motor_off_callback }
 714 };
 715 
 716 /* schedules motor off */
 717 static void floppy_off(unsigned int drive)
     /*  */
 718 {
 719         unsigned long volatile delta;
 720         register int fdc=FDC(drive);
 721 
 722         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 723                 return;
 724 
 725         del_timer(motor_off_timer+drive);
 726 
 727         /* make spindle stop in a position which minimizes spinup time
 728          * next time */
 729         if (UDP->rps ){
 730                 delta = jiffies - UDRS->first_read_date + HZ -
 731                         UDP->spindown_offset;
 732                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 733                 motor_off_timer[drive].expires = UDP->spindown - delta;
 734         }
 735         add_timer(motor_off_timer+drive);
 736 }
 737 
 738 /*
 739  * cycle through all N_DRIVE floppy drives, for disk change testing.
 740  * stopping at current drive. This is done before any long operation, to
 741  * be sure to have up to date disk change information.
 742  */
 743 static void scandrives(void)
     /*  */
 744 {
 745         int i, drive, saved_drive;
 746         
 747         if (DP->select_delay)
 748                 return;
 749 
 750         saved_drive = current_drive;
 751         for(i=0; i< N_DRIVE; i++){
 752                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 753                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 754                         continue; /* skip closed drives */
 755                 set_fdc(drive);
 756                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 757                       (0x10 << UNIT(drive))))
 758                         /* switch the motor off again, if it was off to
 759                          * begin with */
 760                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 761         }
 762         set_fdc(saved_drive);
 763 }
 764 
 765 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 766 
 767 /* this function makes sure that the disk stays in the drive during the
 768  * transfer */
 769 static void fd_watchdog(void)
     /*  */
 770 {
 771 #ifdef DCL_DEBUG
 772         if (DP->flags & FD_DEBUG){
 773                 DPRINT("calling disk change from watchdog\n");
 774         }
 775 #endif
 776 
 777         if ( disk_change(current_drive) ){
 778                 DPRINT("disk removed during i/o\n");
 779                 floppy_shutdown();
 780         } else {                
 781                 del_timer(&fd_timer);
 782                 fd_timer.function = (timeout_fn) fd_watchdog;
 783                 fd_timer.expires = 10;
 784                 add_timer(&fd_timer);
 785         }
 786 }
 787 
 788 static void main_command_interrupt(void)
     /*  */
 789 {
 790         del_timer(&fd_timer);
 791         cont->interrupt();
 792 }
 793 
 794 /* waits for a delay (spinup or select) to pass */
 795 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 796 {
 797         if ( FDCS->reset ){
 798                 reset_fdc(); /* do the reset during sleep to win time
 799                               * if we don't need to sleep, it's a good
 800                               * occasion anyways */
 801                 return 1;
 802         }
 803 
 804         if ( jiffies < delay ){
 805                 del_timer(&fd_timer);
 806                 fd_timer.function = function;
 807                 fd_timer.expires = delay  - jiffies;
 808                 add_timer(&fd_timer);
 809                 return 1;
 810         }
 811         return 0;
 812 }
 813 
 814 static int hlt_disabled=0;
 815 static void floppy_disable_hlt(void)
     /*  */
 816 {
 817         unsigned long flags;
 818         save_flags(flags);
 819         cli();
 820         if(!hlt_disabled){
 821                 hlt_disabled=1;
 822 #ifdef HAVE_DISABLE_HLT
 823                 disable_hlt();
 824 #endif
 825         }
 826         restore_flags(flags);
 827 }
 828 
 829 static void floppy_enable_hlt(void)
     /*  */
 830 {
 831         unsigned long flags;
 832         save_flags(flags);
 833         cli();
 834         if(hlt_disabled){
 835                 hlt_disabled=0;
 836 #ifdef HAVE_DISABLE_HLT
 837                 enable_hlt();
 838 #endif
 839         }
 840         restore_flags(flags);
 841 }
 842                 
 843 
 844 static void setup_DMA(void)
     /*  */
 845 {
 846 #ifdef CONFIG_FLOPPY_SANITY
 847         if ((!CURRENT ||
 848              CURRENT->buffer != current_addr ||
 849              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
 850             (current_addr < floppy_track_buffer ||
 851              current_addr + raw_cmd.length >
 852              floppy_track_buffer + 1024 * max_buffer_sectors)){
 853                 printk("bad address. start=%p lg=%lx tb=%p\n",
 854                        current_addr, raw_cmd.length, floppy_track_buffer);
 855                 if ( CURRENT ){
 856                         printk("buffer=%p nr=%lx cnr=%lx\n",
 857                                CURRENT->buffer, CURRENT->nr_sectors,
 858                                CURRENT->current_nr_sectors);
 859                 }
 860                 cont->done(0);
 861                 FDCS->reset=1;
 862                 return;
 863         }
 864         if ((long) current_addr % 512 ){
 865                 printk("non aligned address: %p\n", current_addr );
 866                 cont->done(0);
 867                 FDCS->reset=1;
 868                 return;
 869         }
 870         if ( ( (long)current_addr & ~(64*1024-1) ) !=
 871             ((long)(current_addr + raw_cmd.length-1)  & ~(64*1024-1))){
 872                 printk("DMA crossing 64-K boundary %p-%p\n",
 873                        current_addr, current_addr + raw_cmd.length);
 874                 cont->done(0);
 875                 FDCS->reset=1;
 876                 return;
 877         }
 878 
 879 #endif
 880         cli();
 881         disable_dma(FLOPPY_DMA);
 882         clear_dma_ff(FLOPPY_DMA);
 883         set_dma_mode(FLOPPY_DMA,
 884                      (raw_cmd.flags & FD_RAW_READ)?
 885                      DMA_MODE_READ : DMA_MODE_WRITE);
 886         set_dma_addr(FLOPPY_DMA, (long) current_addr);
 887         set_dma_count(FLOPPY_DMA, raw_cmd.length);
 888         enable_dma(FLOPPY_DMA);
 889         sti();
 890         floppy_disable_hlt();
 891 }
 892 
 893 /* sends a command byte to the fdc */
 894 static int output_byte(char byte)
     /*  */
 895 {
 896         int counter;
 897         unsigned char status;
 898 
 899         if (FDCS->reset)
 900                 return -1;
 901         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 902                 status = inb_p(FD_STATUS) &(STATUS_READY|STATUS_DIR|STATUS_DMA);
 903                 if (!(status & STATUS_READY))
 904                         continue;
 905                 if (status == STATUS_READY){
 906                         outb_p(byte,FD_DATA);
 907                         return 0;
 908                 } else
 909                         break;
 910         }
 911         FDCS->reset = 1;
 912         if ( !initialising )
 913                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
 914                         byte, status);
 915         return -1;
 916 }
 917 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
 918 
 919 /* gets the response from the fdc */
 920 static int result(void)
     /*  */
 921 {
 922         int i = 0, counter, status;
 923 
 924         if (FDCS->reset)
 925                 return -1;
 926         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
 927                 status = inb_p(FD_STATUS)&
 928                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
 929                 if (!(status & STATUS_READY))
 930                         continue;
 931                 if (status == STATUS_READY)
 932                         return i;
 933                 if (status & STATUS_DMA )
 934                         break;
 935                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
 936                         if (i >= MAX_REPLIES) {
 937                                 DPRINT("floppy_stat reply overrun\n");
 938                                 break;
 939                         }
 940                         reply_buffer[i++] = inb_p(FD_DATA);
 941                 }
 942         }
 943         FDCS->reset = 1;
 944         if ( !initialising )
 945                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
 946                         status, fdc, i);
 947         return -1;
 948 }
 949 
 950 /* Set perpendicular mode as required, based on data rate, if supported.
 951  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
 952  */
 953 static inline void perpendicular_mode(void)
     /*  */
 954 {
 955         unsigned char perp_mode;
 956 
 957         if (!floppy)
 958                 return;
 959         if (floppy->rate & 0x40){
 960                 switch(raw_cmd.rate){
 961                 case 0:
 962                         perp_mode=2;
 963                         break;
 964                 case 3:
 965                         perp_mode=3;
 966                         break;
 967                 default:
 968                         DPRINT("Invalid data rate for perpendicular mode!\n");
 969                         cont->done(0);
 970                         FDCS->reset = 1; /* convenient way to return to
 971                                           * redo without to much hassle (deep
 972                                           * stack et al. */
 973                         return;
 974                 }
 975         } else
 976                 perp_mode = 0;
 977                         
 978         if ( FDCS->perp_mode == perp_mode )
 979                 return;
 980         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
 981                 output_byte(FD_PERPENDICULAR);
 982                 output_byte(perp_mode);
 983                 FDCS->perp_mode = perp_mode;
 984         } else if (perp_mode) {
 985                 DPRINT("perpendicular mode not supported by this FDC.\n");
 986         }
 987 } /* perpendicular_mode */
 988 
 989 #define NOMINAL_DTR 500
 990 
 991 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
 992  * head load time, and DMA disable flag to values needed by floppy.
 993  *
 994  * The value "dtr" is the data transfer rate in Kbps.  It is needed
 995  * to account for the data rate-based scaling done by the 82072 and 82077
 996  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
 997  * 8272a).
 998  *
 999  * Note that changing the data transfer rate has a (probably deleterious)
1000  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1001  * fdc_specify is called again after each data transfer rate
1002  * change.
1003  *
1004  * srt: 1000 to 16000 in microseconds
1005  * hut: 16 to 240 milliseconds
1006  * hlt: 2 to 254 milliseconds
1007  *
1008  * These values are rounded up to the next highest available delay time.
1009  */
1010 static void fdc_specify(void)
     /*  */
1011 {
1012         unsigned char spec1, spec2;
1013         int srt, hlt, hut;
1014         unsigned long dtr = NOMINAL_DTR;
1015         unsigned long scale_dtr = NOMINAL_DTR;
1016         int hlt_max_code = 0x7f;
1017         int hut_max_code = 0xf;
1018 
1019         if (FDCS->need_configure && FDCS->has_fifo) {
1020                 if ( FDCS->reset )
1021                         return;
1022                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1023                 /* TODO: lock this in via LOCK during initialization */
1024                 output_byte(FD_CONFIGURE);
1025                 output_byte(0);
1026                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1027                 output_byte(0);         /* precompensation from track 0 upwards */
1028                 if ( FDCS->reset ){
1029                         FDCS->has_fifo=0;
1030                         return;
1031                 }
1032                 FDCS->need_configure = 0;
1033                 /*DPRINT("FIFO enabled\n");*/
1034         }
1035 
1036         switch (raw_cmd.rate & 0x03) {
1037         case 3:
1038                 dtr = 1000;
1039                 break;
1040         case 1:
1041                 dtr = 300;
1042                 break;
1043         case 2:
1044                 dtr = 250;
1045                 break;
1046         }
1047 
1048         if (FDCS->version >= FDC_82072) {
1049                 scale_dtr = dtr;
1050                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1051                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1052         }
1053 
1054         /* Convert step rate from microseconds to milliseconds and 4 bits */
1055         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1056         if (srt > 0xf)
1057                 srt = 0xf;
1058         else if (srt < 0)
1059                 srt = 0;
1060 
1061         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1062         if (hlt < 0x01)
1063                 hlt = 0x01;
1064         else if (hlt > 0x7f)
1065                 hlt = hlt_max_code;
1066 
1067         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1068         if (hut < 0x1)
1069                 hut = 0x1;
1070         else if (hut > 0xf)
1071                 hut = hut_max_code;
1072 
1073         spec1 = (srt << 4) | hut;
1074         spec2 = (hlt << 1);
1075 
1076         /* If these parameters did not change, just return with success */
1077         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1078                 /* Go ahead and set spec1 and spec2 */
1079                 output_byte(FD_SPECIFY);
1080                 output_byte(FDCS->spec1 = spec1);
1081                 output_byte(FDCS->spec2 = spec2);
1082         }
1083 } /* fdc_specify */
1084 
1085 /* Set the FDC's data transfer rate on behalf of the specified drive.
1086  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1087  * of the specify command (i.e. using the fdc_specify function).
1088  */
1089 static int fdc_dtr(void)
     /*  */
1090 {
1091         /* If data rate not already set to desired value, set it. */
1092         if ( raw_cmd.rate == FDCS->dtr)
1093                 return 0;
1094         
1095         /* Set dtr */
1096         outb_p(raw_cmd.rate, FD_DCR);
1097         
1098         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1099          * need a stabilization period of several milliseconds to be
1100          * enforced after data rate changes before R/W operations.
1101          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1102          */
1103         FDCS->dtr = raw_cmd.rate;
1104         return(wait_for_completion(jiffies+2,
1105                                    (timeout_fn) floppy_ready));
1106 } /* fdc_dtr */
1107 
1108 static void tell_sector(void)
     /*  */
1109 {
1110         printk(": track %d, head %d, sector %d, size %d",
1111                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1112 } /* tell_sector */
1113 
1114 
1115 /*
1116  * Ok, this error interpreting routine is called after a
1117  * DMA read/write has succeeded
1118  * or failed, so we check the results, and copy any buffers.
1119  * hhb: Added better error reporting.
1120  * ak: Made this into a separate routine.
1121  */
1122 static int interpret_errors(void)
     /*  */
1123 {
1124         char bad;
1125 
1126         if (inr!=7) {
1127                 DPRINT("-- FDC reply error");
1128                 FDCS->reset = 1;
1129                 return 1;
1130         }
1131 
1132         /* check IC to find cause of interrupt */
1133         switch ((ST0 & ST0_INTR)>>6) {
1134                 case 1: /* error occurred during command execution */
1135                         bad = 1;
1136                         if (ST1 & ST1_WP) {
1137                                 DPRINT("Drive is write protected\n");
1138                                 CLEARF(FD_DISK_WRITABLE);
1139                                 cont->done(0);
1140                                 bad = 2;
1141                         } else if (ST1 & ST1_ND) {
1142                                 SETF(FD_NEED_TWADDLE);
1143                         } else if (ST1 & ST1_OR) {
1144                                 if (DP->flags & FTD_MSG )
1145                                         DPRINT("Over/Underrun - retrying\n");
1146                                 bad = 0;
1147                         }else if(*errors >= DP->max_errors.reporting){
1148                                 DPRINT("");
1149                                 if (ST0 & ST0_ECE) {
1150                                         printk("Recalibrate failed!");
1151                                 } else if (ST2 & ST2_CRC) {
1152                                         printk("data CRC error");
1153                                         tell_sector();
1154                                 } else if (ST1 & ST1_CRC) {
1155                                         printk("CRC error");
1156                                         tell_sector();
1157                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1158                                         if (!probing) {
1159                                                 printk("sector not found");
1160                                                 tell_sector();
1161                                         } else
1162                                                 printk("probe failed...");
1163                                 } else if (ST2 & ST2_WC) {      /* seek error */
1164                                         printk("wrong cylinder");
1165                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1166                                         printk("bad cylinder");
1167                                 } else {
1168                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1169                                         tell_sector();
1170                                 }
1171                                 printk("\n");
1172 
1173                         }
1174                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1175                                 /* wrong cylinder => recal */
1176                                 DRS->track = NEED_2_RECAL;
1177                         return bad;
1178                 case 2: /* invalid command given */
1179                         DPRINT("Invalid FDC command given!\n");
1180                         cont->done(0);
1181                         return 2;
1182                 case 3:
1183                         DPRINT("Abnormal termination caused by polling\n");
1184                         cont->error();
1185                         return 2;
1186                 default: /* (0) Normal command termination */
1187                         return 0;
1188         }
1189 }
1190 
1191 /*
1192  * This routine is called when everything should be correctly set up
1193  * for the transfer (ie floppy motor is on, the correct floppy is
1194  * selected, and the head is sitting on the right track).
1195  */
1196 static void setup_rw_floppy(void)
     /*  */
1197 {
1198         int i,ready_date,r, flags,dflags;
1199         timeout_fn function;
1200 
1201         flags = raw_cmd.flags;
1202         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1203                 flags |= FD_RAW_INTR;
1204 
1205         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1206                 ready_date = DRS->spinup_date + DP->spinup;             
1207                 /* If spinup will take a long time, rerun scandrives
1208                  * again just before spinup completion. Beware that
1209                  * after scandrives, we must again wait for selection.
1210                  */
1211                 if ( ready_date > jiffies + DP->select_delay){
1212                         ready_date -= DP->select_delay;
1213                         function = (timeout_fn) floppy_start;
1214                 } else
1215                         function = (timeout_fn) setup_rw_floppy;
1216 
1217                 /* wait until the floppy is spinning fast enough */
1218                 if (wait_for_completion(ready_date,function))
1219                         return;
1220         }
1221         dflags = DRS->flags;
1222 
1223         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1224                 setup_DMA();
1225         
1226         if ( flags & FD_RAW_INTR )
1227                 SET_INTR(main_command_interrupt);
1228 
1229         r=0;
1230         for(i=0; i< raw_cmd.cmd_count; i++)
1231                 r|=output_byte( raw_cmd.cmd[i] );
1232 
1233 #ifdef DEBUGT
1234         debugt("rw_command: ");
1235 #endif
1236         if ( r ){
1237                 reset_fdc();
1238                 return;
1239         }
1240 
1241         if ( ! ( flags & FD_RAW_INTR )){
1242                 inr = result();
1243                 cont->interrupt();
1244         } else if ( flags & FD_RAW_NEED_DISK )
1245                 fd_watchdog();
1246 }
1247 
1248 static int blind_seek;
1249 
1250 /*
1251  * This is the routine called after every seek (or recalibrate) interrupt
1252  * from the floppy controller.
1253  */
1254 static void seek_interrupt(void)
     /*  */
1255 {
1256 #ifdef DEBUGT
1257         debugt("seek interrupt:");
1258 #endif
1259         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1260                 DPRINT("seek failed\n");
1261                 DRS->track = NEED_2_RECAL;
1262                 cont->error();
1263                 cont->redo();
1264                 return;
1265         }
1266         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1267 #ifdef DCL_DEBUG
1268                 if (DP->flags & FD_DEBUG){
1269                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1270                         DPRINT1("jiffies=%ld\n", jiffies);
1271                 }
1272 #endif
1273                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1274                 DRS->select_date = jiffies;
1275         }
1276         DRS->track = ST1;
1277         floppy_ready();
1278 }
1279 
1280 static void check_wp(void)
     /*  */
1281 {
1282         if (TESTF(FD_VERIFY)) {
1283                 /* check write protection */
1284                 output_byte( FD_GETSTATUS );
1285                 output_byte( UNIT(current_drive) );
1286                 if ( result() != 1 ){
1287                         FDCS->reset = 1;
1288                         return;
1289                 }
1290                 CLEARF(FD_VERIFY);
1291                 CLEARF(FD_NEED_TWADDLE);
1292 #ifdef DCL_DEBUG
1293                 if (DP->flags & FD_DEBUG){
1294                         DPRINT("checking whether disk is write protected\n");
1295                         DPRINT1("wp=%x\n",ST3 & 0x40);
1296                 }
1297 #endif
1298                 if (!( ST3  & 0x40))
1299                         SETF(FD_DISK_WRITABLE);
1300                 else
1301                         CLEARF(FD_DISK_WRITABLE);
1302         }
1303 }
1304 
1305 static void seek_floppy(void)
     /*  */
1306 {
1307         int track;
1308 
1309         blind_seek=0;
1310 
1311 #ifdef DCL_DEBUG
1312         if (DP->flags & FD_DEBUG){
1313                 DPRINT("calling disk change from seek\n");
1314         }
1315 #endif
1316 
1317         if (!TESTF(FD_DISK_NEWCHANGE) &&
1318             disk_change(current_drive) &&
1319             (raw_cmd.flags & FD_RAW_NEED_DISK)){
1320                 /* the media changed flag should be cleared after the seek.
1321                  * If it isn't, this means that there is really no disk in
1322                  * the drive.
1323                  */
1324                 SETF(FD_DISK_CHANGED);
1325                 cont->done(0);
1326                 cont->redo();
1327                 return;
1328         }
1329         if ( DRS->track <= NEED_1_RECAL ){
1330                 recalibrate_floppy();
1331                 return;
1332         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1333                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1334                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1335                 /* we seek to clear the media-changed condition. Does anybody
1336                  * know a more elegant way, which works on all drives? */
1337                 if ( raw_cmd.track )
1338                         track = raw_cmd.track - 1;
1339                 else {
1340                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1341                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1342                                 blind_seek = 1;
1343                                 raw_cmd.flags |= FD_RAW_NEED_SEEK;
1344                         }
1345                         track = 1;
1346                 }
1347         } else {
1348                 check_wp();
1349                 if (raw_cmd.track != DRS->track &&
1350                     (raw_cmd.flags & FD_RAW_NEED_SEEK))
1351                         track = raw_cmd.track;
1352                 else {
1353                         setup_rw_floppy();
1354                         return;
1355                 }
1356         }
1357 
1358         SET_INTR(seek_interrupt);
1359         output_byte(FD_SEEK);
1360         output_byte(UNIT(current_drive));
1361         LAST_OUT(track);
1362 #ifdef DEBUGT
1363         debugt("seek command:");
1364 #endif
1365 }
1366 
1367 static void recal_interrupt(void)
     /*  */
1368 {
1369 #ifdef DEBUGT
1370         debugt("recal interrupt:");
1371 #endif
1372         if (inr !=2 )
1373                 FDCS->reset = 1;
1374         else if (ST0 & ST0_ECE) {
1375                 switch(DRS->track){
1376                 case NEED_1_RECAL:
1377 #ifdef DEBUGT
1378                         debugt("recal interrupt need 1 recal:");
1379 #endif
1380                         /* after a second recalibrate, we still haven't
1381                          * reached track 0. Probably no drive. Raise an
1382                          * error, as failing immediately might upset 
1383                          * computers possessed by the Devil :-) */
1384                         cont->error();
1385                         cont->redo();
1386                         return;
1387                 case NEED_2_RECAL:
1388 #ifdef DEBUGT
1389                         debugt("recal interrupt need 2 recal:");
1390 #endif
1391                         /* If we already did a recalibrate, and we are not at
1392                          * track 0, this means we have moved. (The only way
1393                          * not to move at recalibration is to be already at
1394                          * track 0.) Clear the new change flag
1395                          */
1396 #ifdef DCL_DEBUG
1397                         if (DP->flags & FD_DEBUG){
1398                                 DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1399                         }
1400 #endif
1401 
1402                         CLEARF(FD_DISK_NEWCHANGE);
1403                         DRS->select_date = jiffies;
1404                         /* fall through */
1405                 default:
1406 #ifdef DEBUGT
1407                         debugt("recal interrupt default:");
1408 #endif
1409                         /* Recalibrate moves the head by at most 80 steps. If
1410                          * after one recalibrate we don't have reached track
1411                          * 0, this might mean that we started beyond track 80.
1412                          * Try again.
1413                          */
1414                         DRS->track = NEED_1_RECAL;
1415                         break;
1416                 }
1417         } else
1418                 DRS->track = ST1;
1419         floppy_ready();
1420 }
1421 
1422 /*
1423  * Unexpected interrupt - Print as much debugging info as we can...
1424  * All bets are off...
1425  */
1426 static void unexpected_floppy_interrupt(void)
     /*  */
1427 {
1428         int i;
1429         if ( initialising )
1430                 return;
1431         if(print_unex){
1432                 DPRINT("unexpected interrupt\n");
1433                 if ( inr >= 0 )
1434                         for(i=0; i<inr; i++)
1435                                 printk("%d %x\n", i, reply_buffer[i] );
1436         }
1437         while(1){
1438                 output_byte(FD_SENSEI);
1439                 inr=result();
1440                 if ( inr != 2 )
1441                         break;
1442                 if(print_unex){
1443                         printk("sensei\n");
1444                         for(i=0; i<inr; i++)
1445                                 printk("%d %x\n", i, reply_buffer[i] );
1446                 }
1447         }
1448         FDCS->reset = 1;
1449 }
1450 
1451 struct tq_struct floppy_tq = 
1452 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1453 
1454 /* interrupt handler */
1455 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1456 {
1457         void (*handler)(void) = DEVICE_INTR;
1458 
1459         floppy_enable_hlt();
1460         CLEAR_INTR;
1461         if ( fdc >= N_FDC || FDCS->address == -1){
1462                 /* we don't even know which FDC is the culprit */
1463                 printk("DOR0=%x\n", fdc_state[0].dor);
1464                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1465                 printk("handler=%p\n", handler);
1466                 return;
1467         }
1468         inr = result();
1469         if (!handler){
1470                 unexpected_floppy_interrupt();
1471                 return;
1472         }
1473         if ( inr == 0 ){
1474                 do {
1475                         output_byte(FD_SENSEI);
1476                         inr = result();
1477                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1478         }
1479         floppy_tq.routine = (void *)(void *) handler;
1480         queue_task_irq(&floppy_tq, &tq_timer);
1481 }
1482 
1483 static void recalibrate_floppy(void)
     /*  */
1484 {
1485 #ifdef DEBUGT
1486         debugt("recalibrate floppy:");
1487 #endif
1488         SET_INTR(recal_interrupt);
1489         output_byte(FD_RECALIBRATE);
1490         LAST_OUT(UNIT(current_drive));
1491 }
1492 
1493 /*
1494  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1495  */
1496 static void reset_interrupt(void)
     /*  */
1497 {
1498 #ifdef DEBUGT
1499         debugt("reset interrupt:");
1500 #endif
1501         fdc_specify();          /* reprogram fdc */
1502         result();               /* get the status ready for set_fdc */
1503         if ( FDCS->reset )
1504                 cont->error(); /* a reset just after a reset. BAD! */
1505         cont->redo();
1506 }
1507 
1508 /*
1509  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1510  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1511  */
1512 static void reset_fdc(void)
     /*  */
1513 {
1514         SET_INTR(reset_interrupt);
1515         FDCS->reset = 0;
1516         reset_fdc_info(0);
1517         if ( FDCS->version >= FDC_82077 )
1518                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1519         else {
1520                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1521                 udelay(FD_RESET_DELAY);
1522                 outb(FDCS->dor, FD_DOR);
1523         }
1524 }
1525 
1526 static void empty(void)
     /*  */
1527 {
1528 }
1529 
1530 void show_floppy(void)
     /*  */
1531 {
1532         int i;
1533 
1534         printk("\n");
1535         printk("floppy driver state\n");
1536         printk("-------------------\n");
1537         for(i=0; i<N_FDC; i++){
1538                 if(FDCS->address != -1){
1539                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1540                         outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1541                         udelay(1000); /* maybe we'll catch an interrupt... */
1542                 }
1543         }
1544         printk("status=%x\n", inb_p(FD_STATUS));
1545         printk("fdc_busy=%d\n", fdc_busy);
1546         if( DEVICE_INTR)
1547                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1548         if(floppy_tq.sync)
1549                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1550         if(fd_timer.prev)
1551                 printk("fd_timer.function=%p\n", fd_timer.function);
1552         if(fd_timeout.prev){
1553                 printk("timer_table=%p\n",fd_timeout.function);
1554                 printk("expires=%ld\n",fd_timeout.expires);
1555                 printk("now=%ld\n",jiffies);
1556         }
1557         printk("cont=%p\n", cont);
1558         printk("CURRENT=%p\n", CURRENT);
1559         printk("command_status=%d\n", command_status);
1560         printk("\n");
1561 }
1562 
1563 static void floppy_shutdown(void)
     /*  */
1564 {
1565         CLEAR_INTR;
1566         floppy_tq.routine = (void *)(void *) empty;
1567         del_timer( &fd_timer);
1568 
1569         floppy_enable_hlt();
1570         disable_dma(FLOPPY_DMA);
1571         /* avoid dma going to a random drive after shutdown */
1572 
1573         if(!initialising)
1574                 DPRINT("floppy timeout\n");
1575         FDCS->reset = 1;
1576         cont->done(0);
1577         cont->redo(); /* this will recall reset when needed */
1578 }
1579 /*typedef void (*timeout_fn)(unsigned long);*/
1580 
1581 /* start motor, check media-changed condition and write protection */
1582 static int start_motor( void (*function)(void)  )
     /*  */
1583 {
1584         int mask, data;
1585 
1586         mask = 0xfc;
1587         data = UNIT(current_drive);
1588         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1589                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1590                         set_debugt();
1591                         /* no read since this drive is running */
1592                         DRS->first_read_date = 0;
1593                         /* note motor start time if motor is not yet running */
1594                         DRS->spinup_date = jiffies;
1595                         data |= (0x10 << UNIT(current_drive));
1596                 }
1597         } else
1598                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1599                         mask &= ~(0x10 << UNIT(current_drive));
1600 
1601         /* starts motor and selects floppy */
1602         del_timer(motor_off_timer + current_drive);
1603         set_dor( fdc, mask, data);
1604 
1605         /* wait_for_completion also schedules reset if needed. */
1606         return(wait_for_completion(DRS->select_date+DP->select_delay,
1607                                    (timeout_fn) function));
1608 }
1609 
1610 static void floppy_ready(void)
     /*  */
1611 {
1612         CHECK_RESET;
1613         if(start_motor(floppy_ready)) return;
1614         if(fdc_dtr()) return;
1615 
1616 #ifdef DCL_DEBUG
1617         if (DP->flags & FD_DEBUG){
1618                 DPRINT("calling disk change from floppy_ready\n");
1619         }
1620 #endif
1621 
1622         if(!(raw_cmd.flags & FD_RAW_NO_MOTOR) &&
1623            disk_change(current_drive) &&
1624            !DP->select_delay)
1625                 twaddle(); /* this clears the dcl on certain drive/controller
1626                             * combinations */
1627 
1628         if ( raw_cmd.flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1629                 perpendicular_mode();
1630                 fdc_specify(); /* must be done here because of hut, hlt ... */
1631                 seek_floppy();
1632         } else
1633                 setup_rw_floppy();
1634 }
1635 
1636 static void floppy_start(void)
     /*  */
1637 {
1638         del_timer(&fd_timeout);
1639         fd_timeout.expires = DP->timeout;
1640         add_timer(&fd_timeout);
1641 
1642         scandrives();
1643 #ifdef DCL_DEBUG
1644                 if (DP->flags & FD_DEBUG){
1645                         DPRINT("setting NEWCHANGE in floppy_start\n");
1646                 }
1647 #endif
1648         SETF(FD_DISK_NEWCHANGE);
1649         floppy_ready();
1650 }
1651 
1652 /*
1653  * ========================================================================
1654  * here ends the bottom half. Exported routines are:
1655   * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1656  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1657  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1658  * and set_dor.
1659  * ========================================================================
1660  */
1661 /*
1662  * General purpose continuations.
1663  * ==============================
1664  */
1665 
1666 static void do_wakeup(void)
     /*  */
1667 {
1668         del_timer(&fd_timeout);
1669         cont = 0;
1670         command_status += 2;
1671         wake_up(&command_done);
1672 }
1673 
1674 static struct cont_t wakeup_cont={
1675         empty,
1676         do_wakeup,
1677         empty,
1678         (done_f)empty
1679 };
1680 
1681 static int wait_til_done( void (*handler)(void ), int interruptible )
     /*  */
1682 {
1683         int ret;
1684 
1685         floppy_tq.routine = (void *)(void *) handler;
1686         queue_task(&floppy_tq, &tq_timer);
1687 
1688         cli();
1689         while(command_status < 2 && NO_SIGNAL)
1690                 if (current->pid)
1691                         interruptible_sleep_on(&command_done);
1692                 else {
1693                         sti();
1694                         run_task_queue(&tq_timer);
1695                         cli();
1696                 }
1697         if(command_status < 2){
1698                 sti();
1699                 floppy_shutdown();
1700                 process_fd_request();
1701                 return -EINTR;
1702         }
1703         sti();
1704 
1705         if ( FDCS->reset )
1706                 command_status = FD_COMMAND_ERROR;
1707         if ( command_status == FD_COMMAND_OKAY )
1708                 ret=0;
1709         else
1710                 ret=-EIO;
1711         command_status = FD_COMMAND_NONE;
1712         return ret;
1713 }
1714 
1715 static void generic_done(int result)
     /*  */
1716 {
1717         command_status = result;
1718         cont = &wakeup_cont;
1719 }
1720 
1721 static void generic_success(void)
     /*  */
1722 {
1723         generic_done(1);
1724 }
1725 
1726 static void generic_failure(void)
     /*  */
1727 {
1728         generic_done(0);
1729 }
1730 
1731 static void success_and_wakeup(void)
     /*  */
1732 {
1733         generic_success();
1734         do_wakeup();
1735 }
1736 
1737 static void failure_and_wakeup(void)
     /*  */
1738 {
1739         generic_failure();
1740         do_wakeup();
1741 }
1742 
1743 /*
1744  * formatting and rw support.
1745  * ==========================
1746  */
1747 
1748 static int next_valid_format(void)
     /*  */
1749 {
1750         int probed_format;
1751 
1752         probed_format = DRS->probed_format;
1753         while(1){
1754                 if ( probed_format >= 8 ||
1755                     ! DP->autodetect[probed_format] ){
1756                         DRS->probed_format = 0;
1757                         return 1;
1758                 }
1759                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1760                         DRS->probed_format = probed_format;
1761                         return 0;
1762                 }
1763                 probed_format++;
1764         }
1765 }
1766 
1767 static void bad_flp_intr(void)
     /*  */
1768 {
1769         if ( probing ){
1770                 DRS->probed_format++;
1771                 if ( !next_valid_format())
1772                         return;
1773         }
1774         (*errors)++;
1775         if (*errors > DRWE->badness)
1776                 DRWE->badness = *errors;
1777         if (*errors > DP->max_errors.abort)
1778                 cont->done(0);
1779         if (*errors > DP->max_errors.reset)
1780                 FDCS->reset = 1;
1781         else if (*errors > DP->max_errors.recal)
1782                 DRS->track = NEED_2_RECAL;
1783 }
1784 
1785 static void set_floppy(int device)
     /*  */
1786 {
1787         if (TYPE(device))
1788                 floppy = TYPE(device) + floppy_type;
1789         else
1790                 floppy = current_type[ DRIVE(device) ];
1791 }
1792 
1793 /*
1794  * formatting and support.
1795  * =======================
1796  */
1797 static void format_interrupt(void)
     /*  */
1798 {
1799         switch (interpret_errors()){
1800         case 1:
1801                 cont->error();
1802         case 2:
1803                 break;
1804         case 0:
1805                 cont->done(1);
1806         }
1807         cont->redo();
1808 }
1809 
1810 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
1811 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
1812 #define CT(x) ( (x) | 0x40 )
1813 static void setup_format_params(void)
     /*  */
1814 {
1815         struct fparm {
1816                 unsigned char track,head,sect,size;
1817         } *here = (struct fparm *)floppy_track_buffer;
1818         int il,n;
1819         int count,head_shift,track_shift;
1820 
1821         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
1822                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
1823         raw_cmd.rate = floppy->rate & 0x3;
1824         raw_cmd.cmd_count = NR_F;
1825         COMMAND = FM_MODE(floppy,FD_FORMAT);
1826         DR_SELECT = UNIT(current_drive) + ( format_req.head << 2 );
1827         F_SIZECODE = FD_SIZECODE(floppy);
1828         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
1829         F_GAP = floppy->fmt_gap;
1830         F_FILL = FD_FILL_BYTE;
1831 
1832         current_addr = floppy_track_buffer;
1833         raw_cmd.length = 4 * F_SECT_PER_TRACK;
1834 
1835         /* allow for about 30ms for data transport per track */
1836         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
1837 
1838         /* a ``cylinder'' is two tracks plus a little stepping time */
1839         track_shift = 2 * head_shift + 1;
1840 
1841         /* position of logical sector 1 on this track */
1842         n = (track_shift * format_req.track + head_shift * format_req.head )
1843                 % F_SECT_PER_TRACK;
1844 
1845         /* determine interleave */
1846         il = 1;
1847         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
1848                 il++;
1849 
1850         /* initialize field */
1851         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
1852                 here[count].track = format_req.track;
1853                 here[count].head = format_req.head;
1854                 here[count].sect = 0;
1855                 here[count].size = F_SIZECODE;
1856         }
1857         /* place logical sectors */
1858         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
1859                 here[n].sect = count;
1860                 n = (n+il) % F_SECT_PER_TRACK;
1861                 if (here[n].sect) { /* sector busy, find next free sector */
1862                         ++n;
1863                         if (n>= F_SECT_PER_TRACK) {
1864                                 n-=F_SECT_PER_TRACK;
1865                                 while (here[n].sect) ++n;
1866                         }
1867                 }
1868         }
1869 }
1870 
1871 static void redo_format(void)
     /*  */
1872 {
1873         raw_cmd.track = format_req.track << floppy->stretch;
1874         buffer_track = -1;
1875         setup_format_params();
1876         floppy_start();
1877 #ifdef DEBUGT
1878         debugt("queue format request");
1879 #endif
1880 }
1881 
1882 static struct cont_t format_cont={
1883         format_interrupt,
1884         redo_format,
1885         bad_flp_intr,
1886         generic_done };
1887 
1888 static int do_format(int device, struct format_descr *tmp_format_req)
     /*  */
1889 {
1890         int ret;
1891         int drive=DRIVE(device);
1892 
1893         LOCK_FDC(drive,1);
1894         set_floppy(device);
1895         if (!floppy ||
1896             floppy->track > DP->tracks ||
1897             tmp_format_req->track >= floppy->track ||
1898             tmp_format_req->head >= floppy->head ||
1899             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
1900             !floppy->fmt_gap) {
1901                 process_fd_request();
1902                 return -EINVAL;
1903         }
1904         format_req = *tmp_format_req;
1905         format_errors = 0;
1906         cont = &format_cont;
1907         errors = &format_errors;
1908         IWAIT(redo_format);
1909         process_fd_request();
1910         return ret;
1911 }
1912 
1913 /*
1914  * Buffer read/write and support
1915  * =============================
1916  */
1917 
1918 /* new request_done. Can handle physical sectors which are smaller than a
1919  * logical buffer */
1920 static void request_done(int uptodate)
     /*  */
1921 {
1922         int block;
1923 
1924         probing = 0;
1925         del_timer(&fd_timeout);
1926 
1927         if (!CURRENT){
1928                 DPRINT("request list destroyed in floppy request done\n");
1929                 return;
1930         }
1931         if (uptodate){
1932                 /* maintain values for invalidation on geometry
1933                    change */
1934                 block = current_count_sectors + CURRENT->sector;
1935                 if (block > DRS->maxblock)
1936                         DRS->maxblock=block;
1937                 if ( block > floppy->sect)
1938                         DRS->maxtrack = 1;
1939 
1940                 /* unlock chained buffers */
1941                 while (current_count_sectors && CURRENT &&
1942                        current_count_sectors >= CURRENT->current_nr_sectors ){
1943                         current_count_sectors -= CURRENT->current_nr_sectors;
1944                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
1945                         CURRENT->sector += CURRENT->current_nr_sectors;
1946                         end_request(1);
1947                 }
1948                 if ( current_count_sectors && CURRENT){
1949                         /* "unlock" last subsector */
1950                         CURRENT->buffer += current_count_sectors <<9;
1951                         CURRENT->current_nr_sectors -= current_count_sectors;
1952                         CURRENT->nr_sectors -= current_count_sectors;
1953                         CURRENT->sector += current_count_sectors;
1954                         return;
1955                 }
1956 
1957                 if ( current_count_sectors && ! CURRENT )
1958                         DPRINT("request list destroyed in floppy request done\n");
1959 
1960         } else {
1961                 if(CURRENT->cmd == WRITE) {
1962                         /* record write error information */
1963                         DRWE->write_errors++;
1964                         if(DRWE->write_errors == 1) {
1965                                 DRWE->first_error_sector = CURRENT->sector;
1966                                 DRWE->first_error_generation = DRS->generation;
1967                         }
1968                         DRWE->last_error_sector = CURRENT->sector;
1969                         DRWE->last_error_generation = DRS->generation;
1970                 }
1971                 end_request(0);
1972         }
1973 }
1974 
1975 /* Interrupt handler evaluating the result of the r/w operation */
1976 static void rw_interrupt(void)
     /*  */
1977 {
1978         int nr_sectors, ssize;
1979 
1980         if ( ! DRS->first_read_date )
1981                 DRS->first_read_date = jiffies;
1982 
1983         nr_sectors = 0;
1984         CODE2SIZE;
1985         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
1986                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
1987                         (sector_t % floppy->sect) % ssize;
1988 
1989 #ifdef CONFIG_FLOPPY_SANITY
1990         if ( nr_sectors > current_count_sectors + ssize -
1991             (current_count_sectors + sector_t) % ssize +
1992             sector_t % ssize){
1993                 DPRINT2("long rw: %x instead of %lx\n",
1994                         nr_sectors, current_count_sectors);
1995                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
1996                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
1997                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
1998                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
1999                        sector_t, ssize);
2000         }
2001 #endif
2002         if ( nr_sectors < 0 )
2003                 nr_sectors = 0;
2004         if ( nr_sectors < current_count_sectors )
2005                 current_count_sectors = nr_sectors;
2006 
2007         switch (interpret_errors()){
2008         case 2:
2009                 cont->redo();
2010                 return;
2011         case 1:
2012                 if (  !current_count_sectors){
2013                         cont->error();
2014                         cont->redo();
2015                         return;
2016                 }
2017                 break;
2018         case 0:
2019                 if (  !current_count_sectors){
2020                         cont->redo();
2021                         return;
2022                 }
2023                 current_type[current_drive] = floppy;
2024                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
2025                         floppy->size >> 1;
2026                 break;
2027         }
2028 
2029         if (probing) {
2030                 if (DP->flags & FTD_MSG)
2031                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2032                                 floppy->name,current_drive);
2033                 current_type[current_drive] = floppy;
2034                 floppy_sizes[DRIVE(current_drive) + (FDC(current_drive) << 7)] =
2035                         floppy->size >> 1;
2036                 probing = 0;
2037         }
2038 
2039         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
2040                 /* transfer directly from buffer */
2041                 cont->done(1);
2042         } else if ( CT(COMMAND) == FD_READ){
2043                 buffer_track = raw_cmd.track;
2044                 buffer_drive = current_drive;
2045                 if ( nr_sectors + sector_t > buffer_max )
2046                         buffer_max = nr_sectors + sector_t;
2047         }
2048         cont->redo();
2049 }
2050 
2051 /* Compute maximal contiguous buffer size. */
2052 static int buffer_chain_size(void)
     /*  */
2053 {
2054         struct buffer_head *bh;
2055         int size;
2056         char *base;
2057 
2058         base = CURRENT->buffer;
2059         size = CURRENT->current_nr_sectors << 9;
2060         bh = CURRENT->bh;
2061 
2062         if (bh){
2063                 bh = bh->b_reqnext;
2064                 while ( bh && bh->b_data == base + size ){
2065                         size += bh->b_size;
2066                         bh = bh->b_reqnext;
2067                 }
2068         }
2069         return size >> 9;
2070 }
2071 
2072 /* Compute the maximal transfer size */
2073 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2074 {
2075         if ( max_sector > sector_t + max_size)
2076                 max_sector = sector_t + max_size;
2077 
2078         /* alignment */
2079         max_sector -= (max_sector % floppy->sect ) % ssize;
2080 
2081         /* transfer size, beginning not aligned */
2082         current_count_sectors = max_sector - sector_t ;
2083 
2084         return max_sector;
2085 }
2086 
2087 /*
2088  * Move data from/to the track buffer to/from the buffer cache.
2089  */
2090 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2091 {
2092         int remaining; /* number of transferred 512-byte sectors */
2093         struct buffer_head *bh;
2094         char *buffer, *dma_buffer;
2095         int size;
2096 
2097         if ( max_sector > max_sector_2 )
2098                 max_sector = max_sector_2;
2099 
2100         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2101 
2102         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2103             buffer_max > sector_t + CURRENT->nr_sectors){
2104                 current_count_sectors = buffer_max - sector_t;
2105                 if ( current_count_sectors > CURRENT->nr_sectors )
2106                         current_count_sectors = CURRENT->nr_sectors;
2107         }
2108         remaining = current_count_sectors << 9;
2109 #ifdef CONFIG_FLOPPY_SANITY
2110         if ((remaining >> 9) > CURRENT->nr_sectors  && 
2111             CT(COMMAND) == FD_WRITE ){
2112                 DPRINT("in copy buffer\n");
2113                 printk("current_count_sectors=%ld\n", current_count_sectors);
2114                 printk("remaining=%d\n", remaining >> 9);
2115                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2116                 printk("CURRENT->current_nr_sectors=%ld\n",
2117                        CURRENT->current_nr_sectors);
2118                 printk("max_sector=%d\n", max_sector);
2119                 printk("ssize=%d\n", ssize);
2120         }
2121 #endif
2122 
2123         if ( max_sector > buffer_max )
2124                 buffer_max = max_sector;
2125 
2126         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2127 
2128         bh = CURRENT->bh;
2129         size = CURRENT->current_nr_sectors << 9;
2130         buffer = CURRENT->buffer;
2131 
2132         while ( remaining > 0){
2133                 if ( size > remaining )
2134                         size = remaining;
2135 #ifdef CONFIG_FLOPPY_SANITY
2136                 if (dma_buffer + size >
2137                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2138                     dma_buffer < floppy_track_buffer ){
2139                         DPRINT1("buffer overrun in copy buffer %d\n",
2140                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2141                         printk("sector_t=%d buffer_min=%d\n",
2142                                sector_t, buffer_min);
2143                         printk("current_count_sectors=%ld\n",
2144                                current_count_sectors);
2145                         if ( CT(COMMAND) == FD_READ )
2146                                 printk("read\n");
2147                         if ( CT(COMMAND) == FD_READ )
2148                                 printk("write\n");
2149                         break;
2150                 }
2151                 if ( ((unsigned long)buffer) % 512 )
2152                         DPRINT1("%p buffer not aligned\n", buffer);
2153 #endif
2154                 if ( CT(COMMAND) == FD_READ )
2155                         memcpy( buffer, dma_buffer, size);
2156                 else
2157                         memcpy( dma_buffer, buffer, size);
2158                 remaining -= size;
2159                 if ( !remaining)
2160                         break;
2161 
2162                 dma_buffer += size;
2163                 bh = bh->b_reqnext;
2164 #ifdef CONFIG_FLOPPY_SANITY
2165                 if ( !bh){
2166                         DPRINT("bh=null in copy buffer after copy\n");
2167                         break;
2168                 }
2169 #endif
2170                 size = bh->b_size;
2171                 buffer = bh->b_data;
2172         }
2173 #ifdef CONFIG_FLOPPY_SANITY
2174         if ( remaining ){
2175                 if ( remaining > 0 )
2176                         max_sector -= remaining >> 9;
2177                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2178         }
2179 #endif
2180 }
2181 
2182 /*
2183  * Formulate a read/write request.
2184  * this routine decides where to load the data (directly to buffer, or to
2185  * tmp floppy area), how much data to load (the size of the buffer, the whole
2186  * track, or a single sector)
2187  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2188  * allocation on the fly, it should be done here. No other part should need
2189  * modification.
2190  */
2191 
2192 static int make_raw_rw_request(void)
     /*  */
2193 {
2194         int aligned_sector_t;
2195         int max_sector, max_size, tracksize, ssize;
2196 
2197         set_fdc(DRIVE(CURRENT->dev));
2198 
2199         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2200                 FD_RAW_NEED_SEEK;
2201         raw_cmd.cmd_count = NR_RW;
2202         if (CURRENT->cmd == READ){
2203                 raw_cmd.flags |= FD_RAW_READ;
2204                 COMMAND = FM_MODE(floppy,FD_READ);
2205         } else if (CURRENT->cmd == WRITE){
2206                 raw_cmd.flags |= FD_RAW_WRITE;
2207                 COMMAND = FM_MODE(floppy,FD_WRITE);
2208         } else {
2209                 DPRINT("make_raw_rw_request: unknown command\n");
2210                 return 0;
2211         }
2212 
2213         max_sector = floppy->sect * floppy->head;
2214         TRACK = CURRENT->sector / max_sector;
2215         sector_t = CURRENT->sector % max_sector;
2216         if ( floppy->track && TRACK >= floppy->track )
2217                 return 0;
2218         HEAD = sector_t / floppy->sect;
2219 
2220         if ( TESTF( FD_NEED_TWADDLE) && sector_t < floppy->sect )
2221                 max_sector = floppy->sect;
2222 
2223         /* 2M disks have phantom sectors on the first track */
2224         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2225                 max_sector = 2 * floppy->sect / 3;
2226                 if (sector_t >= max_sector){
2227                         current_count_sectors =  (floppy->sect - sector_t);
2228                         if ( current_count_sectors > CURRENT->nr_sectors )
2229                                 current_count_sectors = CURRENT->nr_sectors;
2230                         return 1;
2231                 }
2232                 SIZECODE = 2;
2233         } else
2234                 SIZECODE = FD_SIZECODE(floppy);
2235         raw_cmd.rate = floppy->rate & 3;
2236         if ((floppy->rate & FD_2M) &&
2237             (TRACK || HEAD ) &&
2238             raw_cmd.rate == 2)
2239                 raw_cmd.rate = 1;
2240 
2241         if ( SIZECODE )
2242                 SIZECODE2 = 0xff;
2243         else
2244                 SIZECODE2 = 0x80;
2245         raw_cmd.track = TRACK << floppy->stretch;
2246         DR_SELECT = UNIT(current_drive) + ( HEAD << 2 );
2247         GAP = floppy->gap;
2248         CODE2SIZE;
2249         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2250         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2251         tracksize = floppy->sect - floppy->sect % ssize;
2252         if ( tracksize < floppy->sect ){
2253                 SECT_PER_TRACK ++;
2254                 if (  tracksize <= sector_t % floppy->sect)
2255                         SECTOR--;
2256                 while ( tracksize <= sector_t % floppy->sect){
2257                         while( tracksize + ssize > floppy->sect ){
2258                                 SIZECODE--;
2259                                 ssize >>= 1;
2260                         }
2261                         SECTOR++; SECT_PER_TRACK ++;
2262                         tracksize += ssize;
2263                 }
2264                 max_sector = HEAD * floppy->sect + tracksize;
2265         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2266                 max_sector = floppy->sect;
2267 
2268         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2269         max_size = CURRENT->nr_sectors;
2270         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2271             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2272                 /* data already in track buffer */
2273                 if (CT(COMMAND) == FD_READ) {
2274                         copy_buffer(1, max_sector, buffer_max);
2275                         return 1;
2276                 }
2277         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2278                 if (CT(COMMAND) == FD_WRITE){
2279                         if(sector_t + CURRENT->nr_sectors > ssize &&
2280                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2281                                 max_size = ssize + ssize;
2282                         else
2283                                 max_size = ssize;
2284                 }
2285                 raw_cmd.flags &= ~FD_RAW_WRITE;
2286                 raw_cmd.flags |= FD_RAW_READ;
2287                 COMMAND = FM_MODE(floppy,FD_READ);
2288         } else if ((long)CURRENT->buffer <= LAST_DMA_ADDR ) {
2289                 int direct, indirect;
2290 
2291                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2292                         sector_t;
2293 
2294                 max_size = buffer_chain_size();
2295                 if ( max_size > ( LAST_DMA_ADDR - ((long) CURRENT->buffer))>>9)
2296                         max_size=(LAST_DMA_ADDR - ((long)CURRENT->buffer))>>9;
2297                 /* 64 kb boundaries */
2298                 if ( ((max_size << 9) + ((long) CURRENT->buffer)) / K_64 !=
2299                      ((long) CURRENT->buffer ) / K_64 )
2300                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2301                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2302                 /*
2303                  * We try to read tracks, but if we get too many errors, we
2304                  * go back to reading just one sector at a time.
2305                  *
2306                  * This means we should be able to read a sector even if there
2307                  * are other bad sectors on this track.
2308                  */
2309                 if ((indirect - sector_t) * 2 > (direct - sector_t) * 3 &&
2310                     *errors < DP->max_errors.read_track &&
2311                     /*!TESTF( FD_NEED_TWADDLE) &&*/
2312                     ( ( !probing || (DP->read_track &
2313                            (1 <<DRS->probed_format))))){
2314                         max_size = CURRENT->nr_sectors;
2315                 } else {
2316                         current_addr = CURRENT->buffer;
2317                         raw_cmd.length = current_count_sectors << 9;
2318                         return 2;
2319                 }
2320         }
2321 
2322         if ( CT(COMMAND) == FD_READ )
2323                 max_size = max_sector; /* unbounded */
2324 
2325         /* claim buffer track if needed */
2326         if (buffer_track != raw_cmd.track ||  /* bad track */
2327             buffer_drive !=current_drive || /* bad drive */
2328             sector_t > buffer_max ||
2329             sector_t < buffer_min ||
2330             ((CT(COMMAND) == FD_READ ||
2331               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2332              max_sector > 2 * max_buffer_sectors + buffer_min &&
2333              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2334             /* not enough space */ ){
2335                 buffer_track = -1;
2336                 buffer_drive = current_drive;
2337                 buffer_max = buffer_min = aligned_sector_t;
2338         }
2339         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2340 
2341         if ( CT(COMMAND) == FD_WRITE ){
2342                 /* copy write buffer to track buffer.
2343                  * if we get here, we know that the write
2344                  * is either aligned or the data already in the buffer
2345                  * (buffer will be overwritten) */
2346 #ifdef CONFIG_FLOPPY_SANITY
2347                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2348                         DPRINT("internal error offset !=0 on write\n");
2349 #endif
2350                 buffer_track = raw_cmd.track;
2351                 buffer_drive = current_drive;
2352                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2353         } else
2354                 transfer_size(ssize, max_sector,
2355                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2356 
2357         /* round up current_count_sectors to get dma xfer size */
2358         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2359         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2360         raw_cmd.length <<= 9;
2361 #ifdef CONFIG_FLOPPY_SANITY
2362         if ((raw_cmd.length < current_count_sectors << 9) ||
2363             (current_addr != CURRENT->buffer &&
2364              CT(COMMAND) == FD_WRITE &&
2365              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2366               aligned_sector_t < buffer_min )) ||
2367             raw_cmd.length % ( 128 << SIZECODE ) ||
2368             raw_cmd.length <= 0 || current_count_sectors <= 0){
2369                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2370                         raw_cmd.length, current_count_sectors);
2371                 if ( current_addr != CURRENT->buffer )
2372                         printk("addr=%d, length=%ld\n",
2373                                (int) ((current_addr - floppy_track_buffer ) >> 9),
2374                                current_count_sectors);
2375                 printk("st=%d ast=%d mse=%d msi=%d\n",
2376                        sector_t, aligned_sector_t, max_sector, max_size);
2377                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2378                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2379                        COMMAND, SECTOR, HEAD, TRACK);
2380                 printk("buffer drive=%d\n", buffer_drive);
2381                 printk("buffer track=%d\n", buffer_track);
2382                 printk("buffer_min=%d\n", buffer_min );
2383                 printk("buffer_max=%d\n", buffer_max );
2384                 return 0;
2385         }
2386 
2387         if (current_addr != CURRENT->buffer ){
2388                 if (current_addr < floppy_track_buffer ||
2389                     current_count_sectors < 0 ||
2390                     raw_cmd.length < 0 ||
2391                     current_addr + raw_cmd.length >
2392                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2393                         DPRINT("buffer overrun in schedule dma\n");
2394                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2395                                sector_t, buffer_min,
2396                                raw_cmd.length >> 9 );
2397                         printk("current_count_sectors=%ld\n",
2398                                current_count_sectors);
2399                         if ( CT(COMMAND) == FD_READ )
2400                                 printk("read\n");
2401                         if ( CT(COMMAND) == FD_READ )
2402                                 printk("write\n");
2403                         return 0;
2404                 }
2405         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2406                    current_count_sectors > CURRENT->nr_sectors){
2407                 DPRINT("buffer overrun in direct transfer\n");
2408                 return 0;
2409         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2410                 DPRINT("more sectors than bytes\n");
2411                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2412                 printk("sectors=%ld\n", current_count_sectors);
2413         }
2414 #endif
2415         return 2;
2416 }
2417 
2418 static void redo_fd_request(void)
     /*  */
2419 {
2420 #define REPEAT {request_done(0); continue; }
2421         int device;
2422         int tmp;
2423         int error;
2424 
2425         error = -1;
2426         if (current_drive < N_DRIVE)
2427                 floppy_off(current_drive);
2428 
2429         if (CURRENT && CURRENT->dev < 0) return;
2430 
2431         while(1){
2432                 if (!CURRENT) {
2433                         CLEAR_INTR;
2434                         unlock_fdc();
2435                         return;
2436                 }
2437                 if (MAJOR(CURRENT->dev) != MAJOR_NR)
2438                         panic(DEVICE_NAME ": request list destroyed");
2439                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2440                         panic(DEVICE_NAME ": block not locked");
2441 #if 0
2442                 if (!CURRENT->bh->b_count && 
2443                     (CURRENT->errors || error == CURRENT->dev)){
2444                         error=CURRENT->dev;
2445                         DPRINT("skipping read ahead buffer\n");
2446                         REPEAT;
2447                 }
2448 #endif
2449                 error=-1;
2450                 device = CURRENT->dev;
2451                 set_fdc( DRIVE(device));
2452 
2453                 del_timer(&fd_timeout);
2454                 fd_timeout.expires = DP->timeout;
2455                 add_timer(&fd_timeout);
2456 
2457                 set_floppy(device);
2458                 if(start_motor(redo_fd_request)) return;
2459                 if(test_bit(current_drive, &fake_change) ||
2460                    TESTF(FD_DISK_CHANGED)){
2461                         DPRINT("disk absent or changed during operation\n");
2462                         REPEAT;
2463                 }
2464                 if (!floppy) { /* Autodetection */
2465                         if (!probing){
2466                                 DRS->probed_format = 0;
2467                                 if ( next_valid_format() ){
2468                                         DPRINT("no autodetectable formats\n");
2469                                         floppy = NULL;
2470                                         REPEAT;
2471                                 }
2472                         }
2473                         probing = 1;
2474                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2475                 } else
2476                         probing = 0;
2477                 errors = & (CURRENT->errors);
2478                 tmp = make_raw_rw_request();
2479                 if ( tmp < 2 ){
2480                         request_done(tmp);
2481                         continue;
2482                 }
2483 
2484                 if (TESTF(FD_NEED_TWADDLE))
2485                         twaddle();
2486                 floppy_tq.routine = (void *)(void *) floppy_start;
2487                 queue_task(&floppy_tq, &tq_timer);
2488 #ifdef DEBUGT
2489                 debugt("queue fd request");
2490 #endif
2491                 return;
2492         }
2493 #undef REPEAT
2494 }
2495 
2496 static struct cont_t rw_cont={
2497         rw_interrupt,
2498         redo_fd_request,
2499         bad_flp_intr,
2500         request_done };
2501 
2502 struct tq_struct request_tq = 
2503 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2504 
2505 static void process_fd_request(void)
     /*  */
2506 {
2507         cont = &rw_cont;
2508         queue_task(&request_tq, &tq_timer);
2509 }
2510 
2511 static void do_fd_request(void)
     /*  */
2512 {
2513         if (fdc_busy)
2514                 /* fdc busy, this new request will be treated when the
2515                    current one is done */
2516                 return;
2517         /* fdc_busy cannot be set by an interrupt or a bh */
2518         floppy_grab_irq_and_dma();
2519         fdc_busy=1;
2520         process_fd_request();
2521 }
2522 
2523 static struct cont_t poll_cont={
2524         success_and_wakeup,
2525         floppy_ready,
2526         generic_failure,
2527         generic_done };
2528 
2529 static int poll_drive(int interruptible, int flag){
     /*  */
2530         int ret;
2531         /* no auto-sense, just clear dcl */
2532         raw_cmd.flags= flag;
2533         raw_cmd.track=0;
2534         raw_cmd.cmd_count=0;
2535         cont = &poll_cont;
2536 #ifdef DCL_DEBUG
2537                 if (DP->flags & FD_DEBUG){
2538                         DPRINT("setting NEWCHANGE in poll_drive\n");
2539                 }
2540 #endif
2541         SETF(FD_DISK_NEWCHANGE);
2542         WAIT(floppy_ready);
2543         return ret;
2544 }
2545 
2546 /*
2547  * User triggered reset
2548  * ====================
2549  */
2550 
2551 static void reset_intr(void)
     /*  */
2552 {
2553         printk("weird, reset interrupt called\n");
2554 }
2555 
2556 static struct cont_t reset_cont={
2557         reset_intr,
2558         success_and_wakeup,
2559         generic_failure,
2560         generic_done };
2561 
2562 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2563 {
2564         int ret;
2565 
2566         ret=0;
2567         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2568                 return 0;
2569         LOCK_FDC(drive,interruptible);
2570         if(arg == FD_RESET_ALWAYS)
2571                 FDCS->reset=1;
2572         if ( FDCS->reset ){
2573                 cont = &reset_cont;
2574                 del_timer(&fd_timeout);
2575                 fd_timeout.expires = DP->timeout;
2576                 add_timer(&fd_timeout);
2577                 WAIT(reset_fdc);
2578         }
2579         process_fd_request();
2580         return ret;
2581 }
2582 
2583 /*
2584  * Misc Ioctl's and support
2585  * ========================
2586  */
2587 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2588 {
2589         int i;
2590 
2591         i = verify_area(VERIFY_WRITE,param,size);
2592         if (i)
2593                 return i;
2594         memcpy_tofs(param,(void *) address, size);
2595         return 0;
2596 }
2597 
2598 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2599 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2600 
2601 static char *drive_name(int type, int drive )
     /*  */
2602 {
2603         struct floppy_struct *floppy;   
2604 
2605         if ( type )
2606                 floppy = floppy_type + type;
2607         else {
2608                 if ( UDP->native_format )
2609                         floppy = floppy_type + UDP->native_format;
2610                 else
2611                         return "(null)";
2612         }
2613         if ( floppy->name )
2614                 return floppy->name;
2615         else
2616                 return "(null)";
2617 }
2618 
2619 /* raw commands */
2620 static struct cont_t raw_cmd_cont={
2621         success_and_wakeup,
2622         failure_and_wakeup,
2623         generic_failure,
2624         generic_done };
2625 
2626 static int raw_cmd_ioctl(void *param)
     /*  */
2627 {
2628         int i, drive, count, ret;
2629 
2630         if ( FDCS->rawcmd <= 1 )
2631                 FDCS->rawcmd = 1;
2632         for ( drive= 0; drive < N_DRIVE; drive++){
2633                 if ( FDC(drive) != fdc)
2634                         continue;
2635                 if ( drive == current_drive ){
2636                         if ( UDRS->fd_ref > 1 ){
2637                                 FDCS->rawcmd = 2;
2638                                 break;
2639                         }
2640                 } else if ( UDRS->fd_ref ){
2641                         FDCS->rawcmd = 2;
2642                         break;
2643                 }
2644         }
2645 
2646         if(FDCS->reset)
2647                 return -EIO;
2648 
2649         COPYIN(raw_cmd);
2650         raw_cmd.rate &= 0x03;   
2651         count = raw_cmd.length;
2652         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2653                 if(count > max_buffer_sectors * 1024 )
2654                         return -ENOMEM;
2655                 buffer_track = -1;
2656         }
2657         if ( raw_cmd.flags & FD_RAW_WRITE ){
2658                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2659                 if (i)
2660                         return i;
2661                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2662         }
2663 
2664         current_addr = floppy_track_buffer;
2665         cont = &raw_cmd_cont;
2666         IWAIT(floppy_start);
2667 #ifdef DCL_DEBUG
2668         if (DP->flags & FD_DEBUG){
2669                 DPRINT("calling disk change from raw_cmd ioctl\n");
2670         }
2671 #endif
2672         if( disk_change(current_drive) )
2673                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2674         else
2675                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2676         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2677                 motor_off_callback(current_drive);      
2678 
2679         if ( !ret && !FDCS->reset ){
2680                 raw_cmd.reply_count = inr;
2681                 for( i=0; i< raw_cmd.reply_count; i++)
2682                         raw_cmd.reply[i] = reply_buffer[i];
2683                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2684                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2685         } else
2686                 ret = -EIO;
2687         DRS->track = NO_TRACK;
2688         if ( ret )
2689                 return ret;
2690 
2691         if ( raw_cmd.flags & FD_RAW_READ ){
2692                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2693                 if (i)
2694                         return i;
2695         }
2696        
2697         return COPYOUT(raw_cmd);
2698 }
2699 
2700 static int invalidate_drive(int rdev)
     /*  */
2701 {
2702         /* invalidate the buffer track to force a reread */
2703         set_bit( DRIVE(rdev), &fake_change);
2704         process_fd_request();
2705         check_disk_change(rdev);
2706         return 0;
2707 }
2708 
2709 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
2710     unsigned long param)
2711 {
2712 #define IOCTL_MODE_BIT 8
2713 #define OPEN_WRITE_BIT 16
2714 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2715 
2716         struct floppy_struct newparams;
2717         struct format_descr tmp_format_req;
2718         int i,device,drive,type,cnt;
2719         struct floppy_struct *this_floppy;
2720         char *name;
2721 
2722         device = inode->i_rdev;
2723         switch (cmd) {
2724                 RO_IOCTLS(device,param);
2725         }
2726         type = TYPE(device);
2727         drive = DRIVE(device);
2728         switch (cmd) {
2729         case FDGETDRVTYP:
2730                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2731                 if (i)
2732                         return i;
2733                 name = drive_name(type,drive);
2734                 for ( cnt=0; cnt<16; cnt++){
2735                         put_fs_byte(name[cnt],
2736                                     ((char*)param)+cnt);
2737                         if ( ! *name )
2738                                 break;
2739                 }
2740                 return 0;
2741         case FDGETMAXERRS:
2742                 return COPYOUT(UDP->max_errors);
2743         case FDGETPRM:
2744                 if (type)
2745                         this_floppy = &floppy_type[type];
2746                 else if ((this_floppy = current_type[drive]) ==
2747                          NULL)
2748                         return -ENODEV;
2749                 return COPYOUT(this_floppy[0]);
2750         case FDPOLLDRVSTAT:
2751                 LOCK_FDC(drive,1);
2752                 CALL(poll_drive(1, FD_RAW_NEED_DISK));
2753                 process_fd_request();
2754                 /* fall through */
2755         case FDGETDRVSTAT:
2756                 return COPYOUT(*UDRS);
2757         case FDGETFDCSTAT:
2758                 return COPYOUT(*UFDCS);
2759         case FDGETDRVPRM:
2760                 return COPYOUT(*UDP);
2761         case FDWERRORGET:
2762                 return COPYOUT(*UDRWE);
2763         }
2764         if (!IOCTL_ALLOWED)
2765                 return -EPERM;
2766         switch (cmd) {
2767         case FDWERRORCLR:
2768                 UDRWE->write_errors = 0;
2769                 UDRWE->first_error_sector = 0;
2770                 UDRWE->first_error_generation = 0;
2771                 UDRWE->last_error_sector = 0;
2772                 UDRWE->last_error_generation = 0;
2773                 UDRWE->badness = 0;
2774                 return 0;
2775         case FDRAWCMD:
2776                 if (type)
2777                         return -EINVAL;
2778                 LOCK_FDC(drive,1);
2779                 set_floppy(device);
2780                 CALL(i = raw_cmd_ioctl((void *) param));
2781                 process_fd_request();
2782                 return i;
2783         case FDFMTTRK:
2784                 if (UDRS->fd_ref != 1)
2785                         return -EBUSY;
2786                 COPYIN(tmp_format_req);
2787                 return do_format(device, &tmp_format_req);
2788         case FDSETMAXERRS:
2789                 return COPYIN(UDP->max_errors);
2790         case FDFMTBEG:
2791                 return 0;
2792         case FDCLRPRM:
2793                 LOCK_FDC(drive,1);
2794                 current_type[drive] = NULL;
2795                 floppy_sizes[drive] = MAX_DISK_SIZE;
2796                 UDRS->keep_data = 0;
2797                 return invalidate_drive(device);
2798         case FDFMTEND:
2799         case FDFLUSH:
2800                 LOCK_FDC(drive,1);
2801                 return invalidate_drive(device);
2802         case FDSETPRM:
2803         case FDDEFPRM:
2804                 COPYIN(newparams);
2805                 /* sanity checking for parameters.*/
2806                 if(newparams.sect <= 0 ||
2807                    newparams.head <= 0 ||
2808                    newparams.track <= 0 ||
2809                    newparams.track >
2810                    UDP->tracks>>newparams.stretch)
2811                         return -EINVAL;
2812                 if ( type){
2813                         if ( !suser() )
2814                                 return -EPERM;
2815                         LOCK_FDC(drive,1);
2816                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2817                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2818                                     drive_state[cnt].fd_ref)
2819                                         set_bit(drive, &fake_change);
2820                         }
2821                         floppy_type[type] = newparams;
2822                         floppy_type[type].name="user format";
2823                         for (cnt = type << 2 ;
2824                              cnt < (type << 2 ) + 4 ;
2825                              cnt++)
2826                                 floppy_sizes[cnt]=
2827                                         floppy_sizes[cnt+0x80]=
2828                                                 floppy_type[type].size>>1;
2829                         process_fd_request();
2830                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
2831                                 if (TYPE(drive_state[cnt].fd_device) == type &&
2832                                     drive_state[cnt].fd_ref)
2833                                         check_disk_change(drive_state[cnt].
2834                                                           fd_device);
2835                         }
2836                         return 0;
2837                 }
2838 
2839                 LOCK_FDC(drive,1);
2840                 if ( cmd != FDDEFPRM )
2841                         /* notice a disk change immediately, else
2842                          * we loose our settings immediately*/
2843                         CALL(poll_drive(1,0));
2844                 user_params[drive] = newparams;
2845                 if (buffer_drive == drive &&
2846                     buffer_max > user_params[drive].sect)
2847                         buffer_max=user_params[drive].sect;
2848                 current_type[drive] = &user_params[drive];
2849                 floppy_sizes[drive] = user_params[drive].size >> 1;
2850                 if (cmd == FDDEFPRM)
2851                         DRS->keep_data = -1;
2852                 else
2853                         DRS->keep_data = 1;
2854                 /* invalidation. Invalidate only when needed, i.e.
2855                  * when there are already sectors in the buffer cache
2856                  * whose number will change. This is useful, because
2857                  * mtools often changes the geometry of the disk after
2858                  * looking at the boot block */
2859                 if (DRS->maxblock >
2860                     user_params[drive].sect ||
2861                     DRS->maxtrack )
2862                         invalidate_drive(device);
2863                 else
2864                         process_fd_request();
2865                 return 0;
2866         case FDRESET:
2867                 return user_reset_fdc( drive, (int)param, 1);
2868         case FDMSGON:
2869                 UDP->flags |= FTD_MSG;
2870                 return 0;
2871         case FDMSGOFF:
2872                 UDP->flags &= ~FTD_MSG;
2873                 return 0;
2874         case FDSETEMSGTRESH:
2875                 UDP->max_errors.reporting =
2876                         (unsigned short) (param & 0x0f);
2877                 return 0;
2878         case FDTWADDLE:
2879                 LOCK_FDC(drive,1);
2880                 twaddle();
2881                 process_fd_request();
2882         }
2883         if ( ! suser() )
2884                 return -EPERM;
2885         switch(cmd){
2886         case FDSETDRVPRM:
2887                 return COPYIN(*UDP);
2888         default:
2889                 return -EINVAL;
2890         }
2891         return 0;
2892 #undef IOCTL_ALLOWED
2893 }
2894 
2895 static void config_types(void)
     /*  */
2896 {
2897         int first=1;
2898         int drive;
2899 
2900         /* read drive info out of physical cmos */
2901         drive=0;
2902         if (!UDP->cmos )
2903                 UDP->cmos= FLOPPY0_TYPE;
2904         drive=1;
2905         if (!UDP->cmos && FLOPPY1_TYPE)
2906                 UDP->cmos = FLOPPY1_TYPE;
2907 
2908         /* XXX */
2909         /* additional physical CMOS drive detection should go here */
2910 
2911         for (drive=0; drive < N_DRIVE; drive++){
2912                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
2913                         memcpy((char *) UDP,
2914                                (char *) (&default_drive_params[(int)UDP->cmos].params),
2915                                sizeof(struct floppy_drive_params));
2916                 if (UDP->cmos){
2917                         if (first)
2918                                 printk("Floppy drive(s): ");
2919                         else
2920                                 printk(", ");
2921                         first=0;
2922                         if (UDP->cmos > 0 ){
2923                                 ALLOWED_DRIVE_MASK |= 1 << drive;
2924                                 printk("fd%d is %s", drive,
2925                                        default_drive_params[(int)UDP->cmos].name);
2926                         } else
2927                                 printk("fd%d is unknown type %d",drive,
2928                                        UDP->cmos);
2929                 }
2930         }
2931         if(!first)
2932                 printk("\n");
2933 }
2934 
2935 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
2936                        char * buf, int count)
2937 {
2938         int drive = DRIVE(inode->i_rdev);
2939 
2940         check_disk_change(inode->i_rdev);
2941         if (UTESTF(FD_DISK_CHANGED))
2942                 return -ENXIO;
2943         return block_read(inode, filp, buf, count);
2944 }
2945 
2946 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
2947                         char * buf, int count)
2948 {
2949         int block;
2950         int ret;
2951         int drive = DRIVE(inode->i_rdev);
2952 
2953         if(!UDRS->maxblock)
2954                 UDRS->maxblock=1;/* make change detectable */
2955         check_disk_change(inode->i_rdev);
2956         if (UTESTF(FD_DISK_CHANGED)) 
2957                 return -ENXIO;
2958         if(!UTESTF(FD_DISK_WRITABLE))
2959                 return -EROFS;
2960         block = (filp->f_pos + count) >> 9;
2961         if(block > UDRS->maxblock)
2962                 UDRS->maxblock = block;
2963         ret= block_write(inode, filp, buf, count);
2964         return ret;
2965 }
2966 
2967 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
2968 {
2969         int drive;
2970         
2971         drive = DRIVE(inode->i_rdev);
2972 
2973         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
2974                 /* if the file is mounted OR (writable now AND writable at
2975                  * open time) Linus: Does this cover all cases? */
2976                 block_fsync(inode,filp);
2977                         
2978         if (UDRS->fd_ref < 0)
2979                 UDRS->fd_ref=0;
2980         else if (!UDRS->fd_ref--) {
2981                 DPRINT("floppy_release with fd_ref == 0");
2982                 UDRS->fd_ref = 0;
2983         }
2984         floppy_release_irq_and_dma();
2985 }
2986 
2987 /*
2988  * floppy_open check for aliasing (/dev/fd0 can be the same as
2989  * /dev/PS0 etc), and disallows simultaneous access to the same
2990  * drive with different device numbers.
2991  */
2992 #define RETERR(x) \
2993         do{floppy_release(inode,filp); \
2994            return -(x);}while(0)
2995 
2996 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
2997 {
2998         int drive;
2999         int old_dev;
3000 
3001         if (!filp) {
3002                 DPRINT("Weird, open called with filp=0\n");
3003                 return -EIO;
3004         }
3005 
3006         drive = DRIVE(inode->i_rdev);
3007         if (drive >= N_DRIVE || 
3008             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3009             fdc_state[FDC(drive)].version == FDC_NONE)
3010                 return -ENXIO;
3011 
3012         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3013                 return -ENXIO;
3014         old_dev = UDRS->fd_device;
3015         if (UDRS->fd_ref && old_dev != inode->i_rdev)
3016                 return -EBUSY;
3017 
3018         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3019                 USETF(FD_DISK_CHANGED);
3020                 USETF(FD_VERIFY);
3021         }
3022 
3023         if(UDRS->fd_ref == -1 ||
3024            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3025                 return -EBUSY;
3026 
3027         if (floppy_grab_irq_and_dma())
3028                 return -EBUSY;
3029 
3030         if (filp->f_flags & O_EXCL)
3031                 UDRS->fd_ref = -1;
3032         else
3033                 UDRS->fd_ref++;
3034 
3035         UDRS->fd_device = inode->i_rdev;
3036 
3037         if (old_dev && old_dev != inode->i_rdev) {
3038                 if (buffer_drive == drive)
3039                         buffer_track = -1;
3040                 invalidate_buffers(old_dev);
3041         }
3042 
3043         /* Allow ioctls if we have write-permissions even if read-only open */
3044         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3045                 filp->f_mode |= IOCTL_MODE_BIT;
3046         if (filp->f_mode & 2)
3047                 filp->f_mode |= OPEN_WRITE_BIT;
3048 
3049         if (UFDCS->rawcmd == 1)
3050                UFDCS->rawcmd = 2;
3051 
3052         if (filp->f_flags & O_NDELAY)
3053                 return 0;
3054         if (filp->f_mode & 3) {
3055                 UDRS->last_checked = 0;
3056                 check_disk_change(inode->i_rdev);
3057                 if (UTESTF(FD_DISK_CHANGED))
3058                         RETERR(ENXIO);
3059         }
3060         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3061                 RETERR(EROFS);
3062         return 0;
3063 #undef RETERR
3064 }
3065 
3066 /*
3067  * Check if the disk has been changed or if a change has been faked.
3068  */
3069 static int check_floppy_change(dev_t dev)
     /*  */
3070 {
3071         int drive = DRIVE( dev );
3072 
3073         if (MAJOR(dev) != MAJOR_NR) {
3074                 DPRINT("floppy_changed: not a floppy\n");
3075                 return 0;
3076         }
3077 
3078         if (UTESTF(FD_DISK_CHANGED))
3079                 return 1;
3080 
3081         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3082                 lock_fdc(drive,0);
3083                 poll_drive(0,0);
3084                 process_fd_request();
3085         }
3086                 
3087         if(UTESTF(FD_DISK_CHANGED) ||
3088            test_bit(drive, &fake_change) ||
3089            (!TYPE(dev) && !current_type[drive]))
3090                 return 1;
3091         return 0;
3092 }
3093 
3094 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3095  * the bootblock (block 0). "Autodetection" is also needed to check whether
3096  * there is a disk in the drive at all... Thus we also do it for fixed
3097  * geometry formats */
3098 static int floppy_revalidate(dev_t dev)
     /*  */
3099 {
3100 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3101         struct buffer_head * bh;
3102         int drive=DRIVE(dev);
3103         int cf;
3104 
3105         if(UTESTF(FD_DISK_CHANGED) || test_bit(drive, &fake_change) || NO_GEOM){
3106                 lock_fdc(drive,0);
3107                 cf = UTESTF(FD_DISK_CHANGED);
3108                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3109                         process_fd_request(); /*already done by another thread*/
3110                         return 0;
3111                 }
3112                 UDRS->maxblock = 0;
3113                 UDRS->maxtrack = 0;
3114                 if ( buffer_drive == drive)
3115                         buffer_track = -1;
3116                 clear_bit(drive, &fake_change);
3117                 UCLEARF(FD_DISK_CHANGED);
3118                 if(cf)
3119                         UDRS->generation++;
3120                 if(NO_GEOM){
3121                         /* auto-sensing */
3122                         int size = floppy_blocksizes[MINOR(dev)];
3123                         if (!size)
3124                                 size = 1024;
3125                         if (!(bh = getblk(dev,0,size))){
3126                                 process_fd_request();
3127                                 return 1;
3128                         }
3129                         if ( bh && ! bh->b_uptodate)
3130                                 ll_rw_block(READ, 1, &bh);
3131                         process_fd_request();
3132                         wait_on_buffer(bh);
3133                         brelse(bh);
3134                         return 0;
3135                 } 
3136                 if(cf)
3137                                 poll_drive(0, FD_RAW_NEED_DISK);
3138                 process_fd_request();
3139         }
3140         return 0;
3141 }
3142 
3143 static struct file_operations floppy_fops = {
3144         NULL,                   /* lseek - default */
3145         floppy_read,            /* read - general block-dev read */
3146         floppy_write,           /* write - general block-dev write */
3147         NULL,                   /* readdir - bad */
3148         NULL,                   /* select */
3149         fd_ioctl,               /* ioctl */
3150         NULL,                   /* mmap */
3151         floppy_open,            /* open */
3152         floppy_release,         /* release */
3153         block_fsync,            /* fsync */
3154         NULL,                   /* fasync */
3155         check_floppy_change,    /* media_change */
3156         floppy_revalidate,      /* revalidate */
3157 };
3158 
3159 /*
3160  * Floppy Driver initialisation
3161  * =============================
3162  */
3163 
3164 /* Determine the floppy disk controller type */
3165 /* This routine was written by David C. Niemi */
3166 static char get_fdc_version(void)
     /*  */
3167 {
3168         int r;
3169 
3170         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3171         if ( FDCS->reset )
3172                 return FDC_NONE;
3173         if ( (r = result()) <= 0x00)
3174                 return FDC_NONE;        /* No FDC present ??? */
3175         if ((r==1) && (reply_buffer[0] == 0x80)){
3176                 printk("FDC %d is a 8272A\n",fdc);
3177                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3178         }
3179         if (r != 10) {
3180                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3181                 return FDC_UNKNOWN;
3182         }
3183         output_byte(FD_VERSION);
3184         r = result();
3185         if ((r == 1) && (reply_buffer[0] == 0x80)){
3186                 printk("FDC %d is a 82072\n",fdc);
3187                 return FDC_82072;               /* 82072 doesn't know VERSION */
3188         }
3189         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3190                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3191                 return FDC_UNKNOWN;
3192         }
3193         output_byte(FD_UNLOCK);
3194         r = result();
3195         if ((r == 1) && (reply_buffer[0] == 0x80)){
3196                 printk("FDC %d is a pre-1991 82077\n", fdc);
3197                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3198         }
3199         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3200                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3201                 return FDC_UNKNOWN;
3202         }
3203         printk("FDC %d is a post-1991 82077\n",fdc);
3204         return FDC_82077;       /* Revised 82077AA passes all the tests */
3205 } /* get_fdc_version */
3206 
3207 /* lilo configuration */
3208 
3209 /* we make the invert_dcl function global. One day, somebody might
3210 want to centralize all thinkpad related options into one lilo option,
3211 there are just so many thinkpad related quirks! */
3212 void floppy_invert_dcl(int *ints,int param)
     /*  */
3213 {
3214         int i;
3215         
3216         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3217                 if (param)
3218                         default_drive_params[i].params.flags |= 0x80;
3219                 else
3220                         default_drive_params[i].params.flags &= ~0x80;
3221         }
3222         DPRINT("Configuring drives for inverted dcl\n");
3223 }
3224 
3225 static void daring(int *ints,int param)
     /*  */
3226 {
3227         int i;
3228 
3229         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3230                 if (param){
3231                         default_drive_params[i].params.select_delay = 0;
3232                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3233                 } else {
3234                         default_drive_params[i].params.select_delay = 2*HZ/100;
3235                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3236                 }
3237         }
3238         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3239 }
3240 
3241 static void allow_drives(int *ints, int param)
     /*  */
3242 {
3243         ALLOWED_DRIVE_MASK=param;
3244         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3245 }
3246 
3247 static void fdc2_adr(int *ints, int param)
     /*  */
3248 {
3249         FDC2 = param;
3250         if(param)
3251                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3252         else
3253                 DPRINT("disabling second fdc\n");
3254 }
3255 
3256 static void unex(int *ints,int param)
     /*  */
3257 {
3258         print_unex = param;
3259         DPRINT1("%sprinting messages for unexpected interrupts\n",
3260                 param ? "" : "not ");
3261 }
3262 
3263 static void set_cmos(int *ints, int dummy)
     /*  */
3264 {
3265         int current_drive=0;
3266 
3267         if ( ints[0] != 2 ){
3268                 DPRINT("wrong number of parameter for cmos\n");
3269                 return;
3270         }
3271         current_drive = ints[1];
3272         if (current_drive < 0 || current_drive >= 8 ){
3273                 DPRINT("bad drive for set_cmos\n");
3274                 return;
3275         }
3276         if(ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3277                 DPRINT1("bad cmos code %d\n", ints[2]);
3278                 return;
3279         }
3280         DP->cmos = ints[2];
3281         DPRINT1("setting cmos code to %d\n", ints[2]);
3282 }
3283                 
3284 static struct param_table {
3285         char *name;
3286         void (*fn)(int *ints, int param);
3287         int def_param;
3288 } config_params[]={
3289 { "allowed_drive_mask", allow_drives, 0xff },
3290 { "all_drives", allow_drives, 0xff },
3291 { "asus_pci", allow_drives, 0x33 },
3292 
3293 { "daring", daring, 1},
3294 
3295 { "two_fdc", fdc2_adr, 0x370 },
3296 { "one_fdc", fdc2_adr, 0 },
3297 
3298 { "thinkpad", floppy_invert_dcl, 1 },
3299 
3300 { "cmos", set_cmos, 0 },
3301 
3302 { "unexpected_interrupts", unex, 1 },
3303 { "no_unexpected_interrupts", unex, 0 },
3304 { "L40SX", unex, 0 } };
3305 
3306 #define FLOPPY_SETUP
3307 void floppy_setup(char *str, int *ints)
     /*  */
3308 {
3309         int i;
3310         int param;
3311         if(!str)
3312                 return;
3313         for(i=0; i< ARRAY_SIZE(config_params); i++){
3314                 if (strcmp(str,config_params[i].name) == 0 ){
3315                         if (ints[0] )
3316                                 param = ints[1];
3317                         else
3318                                 param = config_params[i].def_param;
3319                         config_params[i].fn(ints,param);
3320                         return;
3321                 }
3322         }
3323         DPRINT1("unknown floppy option %s\n", str);
3324         DPRINT("allowed options are:");
3325         for(i=0; i< ARRAY_SIZE(config_params); i++)
3326                 printk(" %s",config_params[i].name);
3327         printk("\n");
3328         DPRINT("Read linux/drivers/block/README.fd\n");
3329 }
3330 
3331 #ifdef FD_MODULE
3332 static
3333 #endif
3334 int new_floppy_init(void)
     /*  */
3335 {
3336         int i,drive;
3337         int have_no_fdc=0;
3338 
3339         sti();
3340 
3341         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3342                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3343                 return -EBUSY;
3344         }
3345 
3346         for(i=0; i<256; i++)
3347                 if ( TYPE(i))
3348                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3349                 else
3350                         floppy_sizes[i] = MAX_DISK_SIZE;
3351 
3352         blk_size[MAJOR_NR] = floppy_sizes;
3353         blksize_size[MAJOR_NR] = floppy_blocksizes;
3354         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3355         del_timer(&fd_timeout);
3356         config_types();
3357 
3358         fdc_state[0].address = FDC1;
3359         fdc_state[0].dor = 0;
3360 #if N_FDC > 1
3361         fdc_state[1].address = FDC2;
3362         fdc_state[1].dor = 0;
3363 #endif
3364 
3365         for (i = 0 ; i < N_FDC ; i++) {
3366                 fdc = i;
3367                 FDCS->dtr = -1;
3368                 FDCS->dor = 0x4;
3369                 FDCS->reset = 0;
3370                 FDCS->version = FDC_NONE;
3371         }
3372 
3373         if(floppy_grab_irq_and_dma()){
3374                 unregister_blkdev(MAJOR_NR,"fd");
3375                 return -EBUSY;
3376         }
3377 
3378         /* initialise drive state */
3379         for (drive = 0; drive < N_DRIVE ; drive++) {
3380                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3381                 UDRS->generation = 0;
3382                 UDRS->keep_data = 0;
3383                 UDRS->fd_ref = 0;
3384                 UDRS->fd_device = 0;
3385                 UDRWE->write_errors = 0;
3386                 UDRWE->first_error_sector = 0;
3387                 UDRWE->first_error_generation = 0;
3388                 UDRWE->last_error_sector = 0;
3389                 UDRWE->last_error_generation = 0;
3390                 UDRWE->badness = 0;
3391         }
3392 
3393         for (i = 0 ; i < N_FDC ; i++) {
3394                 fdc = i;
3395                 if (FDCS->address == -1 )
3396                         continue;
3397                 FDCS->rawcmd = 2;
3398                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3399                         FDCS->address = -1;
3400                         continue;
3401                 }
3402                 /* Try to determine the floppy controller type */
3403                 FDCS->version = get_fdc_version();
3404                 if (FDCS->version == FDC_NONE){
3405                         FDCS->address = -1;
3406                         continue;
3407                 }
3408 
3409                 have_no_fdc = 0;
3410                 /* Not all FDCs seem to be able to handle the version command
3411                  * properly, so force a reset for the standard FDC clones,
3412                  * to avoid interrupt garbage.
3413                  */
3414                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3415                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3416         }
3417         fdc=0;
3418         current_drive = 0;
3419         floppy_release_irq_and_dma();
3420         initialising=0;
3421         if(have_no_fdc)
3422                 unregister_blkdev(MAJOR_NR,"fd");
3423         return have_no_fdc;
3424 }
3425 
3426 /* stupid compatibility hack... */
3427 void floppy_init(void)
     /*  */
3428 {
3429         new_floppy_init();
3430 }
3431 
3432 static int floppy_grab_irq_and_dma(void)
     /*  */
3433 {
3434         int i;
3435         cli();
3436         if (usage_count++){
3437                 sti();
3438                 return 0;
3439         }
3440         sti();
3441 #ifdef FD_MODULE
3442         MOD_INC_USE_COUNT;
3443 #endif
3444         for(i=0; i< N_FDC; i++){
3445                 if(FDCS->address != -1){        
3446                         fdc = i;
3447                         reset_fdc_info(1);
3448                         outb_p(FDCS->dor, FD_DOR);
3449                 }
3450         }
3451         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3452 
3453         if (request_irq(FLOPPY_IRQ, floppy_interrupt, SA_INTERRUPT, "floppy")) {
3454                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3455                         FLOPPY_IRQ);
3456                 return -1;
3457         }
3458         if (request_dma(FLOPPY_DMA,"floppy")) {
3459                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3460                         FLOPPY_DMA);
3461                 free_irq(FLOPPY_IRQ);
3462                 return -1;
3463         }
3464         for(fdc = 0; fdc < N_FDC ; fdc++)
3465                 if(FDCS->address != -1)
3466                         outb_p(FDCS->dor, FD_DOR);
3467         fdc = 0;
3468         enable_irq(FLOPPY_IRQ);
3469         return 0;
3470 }
3471 
3472 static void floppy_release_irq_and_dma(void)
     /*  */
3473 {
3474 #ifdef CONFIG_FLOPPY_SANITY
3475         int drive;
3476 #endif
3477         cli();
3478         if (--usage_count){
3479                 sti();
3480                 return;
3481         }
3482         sti();
3483 #ifdef FD_MODULE
3484         MOD_DEC_USE_COUNT;
3485 #endif
3486         disable_dma(FLOPPY_DMA);
3487         free_dma(FLOPPY_DMA);
3488         disable_irq(FLOPPY_IRQ);
3489         free_irq(FLOPPY_IRQ);
3490 
3491         set_dor(0, ~0, 8);
3492 #if N_FDC > 1
3493         set_dor(1, ~8, 0);
3494 #endif
3495         floppy_enable_hlt();
3496 #ifdef CONFIG_FLOPPY_SANITY
3497         for(drive=0; drive < N_FDC * 4; drive++)
3498                 if( motor_off_timer[drive].next )
3499                         printk("motor off timer %d still active\n", drive);
3500         
3501         if(fd_timeout.next)
3502                 printk("floppy timer still active\n");
3503         if (fd_timer.next)
3504                 printk("auxiliary floppy timer still active\n");
3505         if(floppy_tq.sync)
3506                 printk("task queue still active\n");
3507 #endif
3508 }
3509
/* */
root/drivers/block/floppy.c

DEFINITIONS
