drivers/block/floppy.c

/* */
This source file includes following definitions.
__get_order
dma_mem_alloc
TYPE
DRIVE
set_debugt
debugt
is_alive
reschedule_timeout
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
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
fd_copyin
drive_name
raw_cmd_done
raw_cmd_copyout
raw_cmd_free
raw_cmd_copyin
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
floppy_init
floppy_grab_irq_and_dma
floppy_release_irq_and_dma
mod_setup
init_module
cleanup_module
   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 /*
  85  * 1995/8/26 -- Andreas Busse -- added Mips support.
  86  */
  87 
  88 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
  89  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
  90  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
  91  * drives are "upside-down").
  92  */
  93 
  94 /*
  95  * 1995/18/10 -- Ralf Baechle -- Portability cleanup; move machine dependend
  96  * features to asm/floppy.h.
  97  */
  98 
  99 #define FLOPPY_SANITY_CHECK
 100 #undef  FLOPPY_SILENT_DCL_CLEAR
 101 
 102 #define REALLY_SLOW_IO
 103 
 104 #define DEBUGT 2
 105 #define DCL_DEBUG /* debug disk change line */
 106 
 107 /* do print messages for unexpected interrupts */
 108 static int print_unex=1;
 109 
 110 #include <linux/module.h>
 111 
 112 #ifdef MODULE
 113 
 114 #define FD_MODULE
 115 
 116 int FLOPPY_IRQ=6;
 117 int FLOPPY_DMA=2;
 118 int ALLOWED_DRIVE_MASK = 0x33;
 119 
 120 #endif
 121 
 122 #ifndef FD_MODULE
 123 /* the following is the mask of allowed drives. By default units 2 and
 124  * 3 of both floppy controllers are disabled, because switching on the
 125  * motor of these drives causes system hangs on some PCI computers. drive
 126  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 127  * a drive is allowed. */
 128 static int ALLOWED_DRIVE_MASK=0x33;
 129 
 130 #define FLOPPY_IRQ 6
 131 #define FLOPPY_DMA 2
 132 #endif
 133 
 134 #define MODULE_AWARE_DRIVER
 135 
 136 #include <linux/sched.h>
 137 #include <linux/fs.h>
 138 #include <linux/kernel.h>
 139 #include <linux/timer.h>
 140 #include <linux/tqueue.h>
 141 #define FDPATCHES
 142 #include <linux/fdreg.h>
 143 
 144 /* ============================================ *
 145  * old fd.h                                     *
 146  * =========================================== */
 147 
 148 #define OLDFDCLRPRM 0 /* clear user-defined parameters */
 149 #define OLDFDSETPRM 1 /* set user-defined parameters for current media */
 150 #define OLDFDSETMEDIAPRM 1
 151 #define OLDFDDEFPRM 2 /* set user-defined parameters until explicitly cleared */
 152 #define OLDFDDEFMEDIAPRM 2
 153 #define OLDFDGETPRM 3 /* get disk parameters */
 154 #define OLDFDGETMEDIAPRM 3
 155 #define OLDFDMSGON  4 /* issue kernel messages on media type change */
 156 #define OLDFDMSGOFF 5 /* don't issue kernel messages on media type change */
 157 #define OLDFDFMTBEG 6 /* begin formatting a disk */
 158 #define OLDFDFMTTRK 7 /* format the specified track */
 159 #define OLDFDFMTEND 8 /* end formatting a disk */
 160 #define OLDFDSETEMSGTRESH       10      /* set fdc error reporting threshold */
 161 #define OLDFDFLUSH  11 /* flush buffers for media; either for verifying media, or for
 162                        handling a media change without closing the file
 163                        descriptor */
 164 #define OLDFDSETMAXERRS 12 /* set abortion and read_track threshold */
 165 #define OLDFDGETMAXERRS 14 /* get abortion and read_track threshold */
 166 #define OLDFDGETDRVTYP 16          /* get drive type: 5 1/4 or 3 1/2 */
 167 
 168 #define OLDFDSETDRVPRM 20 /* set drive parameters */
 169 #define OLDFDGETDRVPRM 21 /* get drive parameters */
 170 #define OLDFDGETDRVSTAT 22 /* get drive state */
 171 #define OLDFDPOLLDRVSTAT 23 /* get drive state */
 172 #define OLDFDRESET 24 /* reset FDC */
 173 
 174 #define OLDFD_RESET_IF_NEEDED 0
 175 #define OLDFD_RESET_IF_RAWCMD 1
 176 #define OLDFD_RESET_ALWAYS 2
 177 
 178 #define OLDFDGETFDCSTAT 25 /* get fdc state */
 179 #define OLDFDWERRORCLR  27 /* clear write error and badness information */
 180 #define OLDFDWERRORGET  28 /* get write error and badness information */
 181 
 182 #define OLDFDRAWCMD 30 /* send a raw command to the fdc */
 183 
 184 #define OLDFDTWADDLE 40 /* flicker motor-on bit before reading a sector */
 185 
 186 struct old_floppy_raw_cmd {
 187   void *data;
 188   long length;
 189 
 190   unsigned char rate;
 191   unsigned char flags;
 192   unsigned char cmd_count;
 193   unsigned char cmd[9];
 194   unsigned char reply_count;
 195   unsigned char reply[7];
 196   int track;
 197 };
 198 
 199 struct old_floppy_fdc_state {   
 200         int spec1; /* spec1 value last used */
 201         int spec2; /* spec2 value last used */
 202         int dtr;
 203         unsigned char version;  /* FDC version code */
 204         unsigned char dor;
 205         int address; /* io address */
 206         unsigned int rawcmd:2;
 207         unsigned int reset:1;
 208         unsigned int need_configure:1;
 209         unsigned int perp_mode:2;
 210         unsigned int has_fifo:1;
 211 };
 212 
 213 
 214 #include <linux/fd.h>
 215 #include <linux/errno.h>
 216 #include <linux/malloc.h>
 217 #include <linux/mm.h>
 218 #include <linux/string.h>
 219 #include <linux/fcntl.h>
 220 #include <linux/delay.h>
 221 #include <linux/mc146818rtc.h> /* CMOS defines */
 222 #include <linux/ioport.h>
 223 
 224 #include <asm/dma.h>
 225 #include <asm/floppy.h>
 226 #include <asm/irq.h>
 227 #include <asm/system.h>
 228 #include <asm/io.h>
 229 #include <asm/segment.h>
 230 
 231 #define MAJOR_NR FLOPPY_MAJOR
 232 #include <linux/blk.h>
 233 
 234 
 235 /*
 236  * Dma Memory related stuff
 237  */
 238 /* Pure 2^n version of get_order */
 239 static inline int __get_order (int size)
     /*  */
 240 {
 241         int order;
 242 
 243 #ifdef  _ASM_IO_H2
 244         __asm__ __volatile__("bsr %1,%0"
 245                              : "=r" (order)
 246                              : "r" (size / PAGE_SIZE) );
 247 #else
 248         for (order = 0; order < NR_MEM_LISTS; ++order)
 249                 if (size <= (PAGE_SIZE << order))
 250                         return order;
 251 #endif
 252         return NR_MEM_LISTS;
 253 }
 254 
 255 static unsigned long dma_mem_alloc(int size)
     /*  */
 256 {
 257         int order = __get_order(size);
 258 
 259         if (order >= NR_MEM_LISTS)
 260                 return(0);
 261         return __get_dma_pages(GFP_KERNEL,order);
 262 }
 263 
 264 static unsigned int fake_change = 0;
 265 static int initialising=1;
 266 
 267 static inline int TYPE(kdev_t x) {
     /*  */
 268         return  (MINOR(x)>>2) & 0x1f;
 269 }
 270 static inline int DRIVE(kdev_t x) {
     /*  */
 271         return (MINOR(x)&0x03) | ((MINOR(x)&0x80 ) >> 5);
 272 }
 273 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 274 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 275 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 276 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 277                                 /* reverse mapping from unit and fdc to drive */
 278 #define DP (&drive_params[current_drive])
 279 #define DRS (&drive_state[current_drive])
 280 #define DRWE (&write_errors[current_drive])
 281 #define FDCS (&fdc_state[fdc])
 282 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 283 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 284 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 285 
 286 #define UDP (&drive_params[drive])
 287 #define UDRS (&drive_state[drive])
 288 #define UDRWE (&write_errors[drive])
 289 #define UFDCS (&fdc_state[FDC(drive)])
 290 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 291 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 292 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 293 
 294 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 295 
 296 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 297 
 298 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 299 
 300 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 301 
 302 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 303 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 304 
 305 /* read/write */
 306 #define COMMAND raw_cmd->cmd[0]
 307 #define DR_SELECT raw_cmd->cmd[1]
 308 #define TRACK raw_cmd->cmd[2]
 309 #define HEAD raw_cmd->cmd[3]
 310 #define SECTOR raw_cmd->cmd[4]
 311 #define SIZECODE raw_cmd->cmd[5]
 312 #define SECT_PER_TRACK raw_cmd->cmd[6]
 313 #define GAP raw_cmd->cmd[7]
 314 #define SIZECODE2 raw_cmd->cmd[8]
 315 #define NR_RW 9
 316 
 317 /* format */
 318 #define F_SIZECODE raw_cmd->cmd[2]
 319 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 320 #define F_GAP raw_cmd->cmd[4]
 321 #define F_FILL raw_cmd->cmd[5]
 322 #define NR_F 6
 323 
 324 /*
 325  * Maximum disk size (in kilobytes). This default is used whenever the
 326  * current disk size is unknown.
 327  * [Now it is rather a minimum]
 328  */
 329 #define MAX_DISK_SIZE 2 /* 3984*/
 330 
 331 #define K_64    0x10000         /* 64KB */
 332 
 333 /*
 334  * globals used by 'result()'
 335  */
 336 #define MAX_REPLIES 10
 337 static unsigned char reply_buffer[MAX_REPLIES];
 338 static int inr; /* size of reply buffer, when called from interrupt */
 339 #define ST0 (reply_buffer[0])
 340 #define ST1 (reply_buffer[1])
 341 #define ST2 (reply_buffer[2])
 342 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 343 #define R_TRACK (reply_buffer[3])
 344 #define R_HEAD (reply_buffer[4])
 345 #define R_SECTOR (reply_buffer[5])
 346 #define R_SIZECODE (reply_buffer[6])
 347 
 348 #define SEL_DLY (2*HZ/100)
 349 
 350 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 351 /*
 352  * this struct defines the different floppy drive types.
 353  */
 354 static struct {
 355         struct floppy_drive_params params;
 356         const char *name; /* name printed while booting */
 357 } default_drive_params[]= {
 358 /* NOTE: the time values in jiffies should be in msec!
 359  CMOS drive type
 360   |     Maximum data rate supported by drive type
 361   |     |   Head load time, msec
 362   |     |   |   Head unload time, msec (not used)
 363   |     |   |   |     Step rate interval, usec
 364   |     |   |   |     |       Time needed for spinup time (jiffies)
 365   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 366   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 367   |     |   |   |     |       |      |   |     Select delay
 368   |     |   |   |     |       |      |   |     |     RPS
 369   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 370   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 371   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 372   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 373 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 374       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 375 
 376 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 377       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 378 
 379 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 380       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 381 
 382 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 383       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 384 
 385 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 386       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 387 
 388 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 389       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 390 
 391 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 392       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 393 /*    |  --autodetected formats---    |      |      |
 394  *    read_track                      |      |    Name printed when booting
 395  *                                    |     Native format
 396  *                  Frequency of disk change checks */
 397 };
 398 
 399 static struct floppy_drive_params drive_params[N_DRIVE];
 400 static struct floppy_drive_struct drive_state[N_DRIVE];
 401 static struct floppy_write_errors write_errors[N_DRIVE];
 402 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 403 
 404 /*
 405  * This struct defines the different floppy types.
 406  *
 407  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 408  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 409  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 410  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 411  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 412  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 413  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 414  * 'stretch' should probably be renamed to something more general, like
 415  * 'options'.  Other parameters should be self-explanatory (see also
 416  * setfdprm(8)).
 417  */
 418 static struct floppy_struct floppy_type[32] = {
 419         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 420         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 421         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 422         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 423         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 424         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 425         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 426         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 427         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 428         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 429 
 430         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 431         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 432         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 433         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 434         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 435         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 436         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 437         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 438         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 439         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 440 
 441         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 442         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 443         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 444         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 445         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 446         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 447         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 448         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 449         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 450 
 451         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 452         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 453         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 454 };
 455 
 456 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 457 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 458 
 459 /* Auto-detection: Disk type used until the next media change occurs. */
 460 struct floppy_struct *current_type[N_DRIVE] = {
 461         NULL, NULL, NULL, NULL,
 462         NULL, NULL, NULL, NULL
 463 };
 464 
 465 /*
 466  * User-provided type information. current_type points to
 467  * the respective entry of this array.
 468  */
 469 struct floppy_struct user_params[N_DRIVE];
 470 
 471 static int floppy_sizes[256];
 472 static int floppy_blocksizes[256] = { 0, };
 473 
 474 /*
 475  * The driver is trying to determine the correct media format
 476  * while probing is set. rw_interrupt() clears it after a
 477  * successful access.
 478  */
 479 static int probing = 0;
 480 
 481 /* Synchronization of FDC access. */
 482 #define FD_COMMAND_DETECT -2
 483 #define FD_COMMAND_NONE -1
 484 #define FD_COMMAND_ERROR 2
 485 #define FD_COMMAND_OKAY 3
 486 
 487 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 488 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 489 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 490 #define CALL(x) if( (x) == -EINTR) return -EINTR
 491 #define ECALL(x) if((ret = (x))) return ret;
 492 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 493 #define WAIT(x) _WAIT((x),interruptible)
 494 #define IWAIT(x) _WAIT((x),1)
 495 
 496 /* Errors during formatting are counted here. */
 497 static int format_errors;
 498 
 499 /* Format request descriptor. */
 500 static struct format_descr format_req;
 501 
 502 /*
 503  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 504  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 505  * H is head unload time (1=16ms, 2=32ms, etc)
 506  */
 507 
 508 /*
 509  * Track buffer
 510  * Because these are written to by the DMA controller, they must
 511  * not contain a 64k byte boundary crossing, or data will be
 512  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 513  * Note that you must not change the sizes below without updating head.S.
 514  */
 515 char *floppy_track_buffer=0;
 516 int max_buffer_sectors=0;
 517 
 518 int *errors;
 519 typedef void (*done_f)(int);
 520 struct cont_t {
 521         void (*interrupt)(void); /* this is called after the interrupt of the
 522                                   * main command */
 523         void (*redo)(void); /* this is called to retry the operation */
 524         void (*error)(void); /* this is called to tally an error */
 525         done_f done; /* this is called to say if the operation has 
 526                       * succeeded/failed */
 527 } *cont=NULL;
 528 
 529 static void floppy_ready(void);
 530 static void floppy_start(void);
 531 static void process_fd_request(void);
 532 static void recalibrate_floppy(void);
 533 static void floppy_shutdown(void);
 534 
 535 static int floppy_grab_irq_and_dma(void);
 536 static void floppy_release_irq_and_dma(void);
 537 
 538 /*
 539  * The "reset" variable should be tested whenever an interrupt is scheduled,
 540  * after the commands have been sent. This is to ensure that the driver doesn't
 541  * get wedged when the interrupt doesn't come because of a failed command.
 542  * reset doesn't need to be tested before sending commands, because
 543  * output_byte is automatically disabled when reset is set.
 544  */
 545 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 546 static void reset_fdc(void);
 547 
 548 /*
 549  * These are global variables, as that's the easiest way to give
 550  * information to interrupts. They are the data used for the current
 551  * request.
 552  */
 553 #define NO_TRACK -1
 554 #define NEED_1_RECAL -2
 555 #define NEED_2_RECAL -3
 556 
 557 /* */
 558 static int usage_count = 0;
 559 
 560 
 561 /* buffer related variables */
 562 static int buffer_track = -1;
 563 static int buffer_drive = -1;
 564 static int buffer_min = -1;
 565 static int buffer_max = -1;
 566 
 567 /* fdc related variables, should end up in a struct */
 568 static struct floppy_fdc_state fdc_state[N_FDC];
 569 static int fdc; /* current fdc */
 570 
 571 static struct floppy_struct * floppy = floppy_type;
 572 static unsigned char current_drive = 0;
 573 static long current_count_sectors = 0;
 574 static unsigned char sector_t; /* sector in track */
 575 
 576 #ifdef DEBUGT
 577 long unsigned debugtimer;
 578 #endif
 579 
 580 /*
 581  * Debugging
 582  * =========
 583  */
 584 static inline void set_debugt(void)
     /*  */
 585 {
 586 #ifdef DEBUGT
 587         debugtimer = jiffies;
 588 #endif
 589 }
 590 
 591 static inline void debugt(const char *message)
     /*  */
 592 {
 593 #ifdef DEBUGT
 594         if ( DP->flags & DEBUGT )
 595                 printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 596 #endif
 597 }
 598 
 599 typedef void (*timeout_fn)(unsigned long);
 600 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 601                                        (timeout_fn) floppy_shutdown };
 602 
 603 static const char *timeout_message;
 604 
 605 #ifdef FLOPPY_SANITY_CHECK
 606 static void is_alive(const char *message)
     /*  */
 607 {
 608         /* this routine checks whether the floppy driver is "alive" */
 609         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 610                 DPRINT1("timeout handler died: %s\n",message);
 611         }
 612 }
 613 #endif
 614 
 615 #ifdef FLOPPY_SANITY_CHECK
 616 
 617 #define OLOGSIZE 20
 618 
 619 void (*lasthandler)(void) = NULL;
 620 int interruptjiffies=0;
 621 int resultjiffies=0;
 622 int resultsize=0;
 623 int lastredo=0;
 624 
 625 static struct output_log {
 626         unsigned char data;
 627         unsigned char status;
 628         unsigned long jiffies;
 629 } output_log[OLOGSIZE];
 630 
 631 static int output_log_pos=0;
 632 #endif
 633 
 634 #define CURRENTD -1
 635 #define MAXTIMEOUT -2
 636 
 637 
 638 
 639 static void reschedule_timeout(int drive, const char *message, int marg)
     /*  */
 640 {
 641         if (drive == CURRENTD )
 642                 drive = current_drive;
 643         del_timer(&fd_timeout);
 644         if (drive < 0 || drive > N_DRIVE) {
 645                 fd_timeout.expires = jiffies + 20*HZ;
 646                 drive=0;
 647         } else
 648                 fd_timeout.expires = jiffies + UDP->timeout;
 649         add_timer(&fd_timeout);
 650         if (UDP->flags & FD_DEBUG){
 651                 DPRINT("reschedule timeout ");
 652                 printk(message, marg);
 653                 printk("\n");
 654         }
 655         timeout_message = message;
 656 }
 657 
 658 /*
 659  * Bottom half floppy driver.
 660  * ==========================
 661  *
 662  * This part of the file contains the code talking directly to the hardware,
 663  * and also the main service loop (seek-configure-spinup-command)
 664  */
 665 
 666 /*
 667  * disk change.
 668  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 669  * and the last_checked date.
 670  *
 671  * last_checked is the date of the last check which showed 'no disk change'
 672  * FD_DISK_CHANGE is set under two conditions:
 673  * 1. The floppy has been changed after some i/o to that floppy already
 674  *    took place.
 675  * 2. No floppy disk is in the drive. This is done in order to ensure that
 676  *    requests are quickly flushed in case there is no disk in the drive. It
 677  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 678  *    the drive.
 679  *
 680  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 681  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 682  *  each seek. If a disk is present, the disk change line should also be
 683  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 684  *  change line is set, this means either that no disk is in the drive, or
 685  *  that it has been removed since the last seek.
 686  *
 687  * This means that we really have a third possibility too:
 688  *  The floppy has been changed after the last seek.
 689  */
 690 
 691 static int disk_change(int drive)
     /*  */
 692 {
 693         int fdc=FDC(drive);
 694 #ifdef FLOPPY_SANITY_CHECK
 695         if(jiffies < UDP->select_delay + UDRS->select_date)
 696                 DPRINT("WARNING disk change called early\n");
 697         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 698            (FDCS->dor & 3) != UNIT(drive) ||
 699            fdc != FDC(drive)){
 700                 DPRINT("probing disk change on unselected drive\n");
 701                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 702                         FDCS->dor);
 703         }
 704 #endif
 705 
 706 #ifdef DCL_DEBUG
 707         if (UDP->flags & FD_DEBUG){
 708                 DPRINT1("checking disk change line for drive %d\n",drive);
 709                 DPRINT1("jiffies=%ld\n", jiffies);
 710                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 711                 DPRINT1("flags=%x\n",UDRS->flags);
 712         }
 713 #endif
 714         if (UDP->flags & FD_BROKEN_DCL)
 715                 return UTESTF(FD_DISK_CHANGED);
 716         if( (fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 717                 USETF(FD_VERIFY); /* verify write protection */
 718                 if(UDRS->maxblock){
 719                         /* mark it changed */
 720                         USETF(FD_DISK_CHANGED);
 721 
 722                         /* invalidate its geometry */
 723                         if (UDRS->keep_data >= 0) {
 724                                 if ((UDP->flags & FTD_MSG) &&
 725                                     current_type[drive] != NULL)
 726                                         DPRINT("Disk type is undefined after "
 727                                                "disk change\n");
 728                                 current_type[drive] = NULL;
 729                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 730                         }
 731                 }
 732                 /*USETF(FD_DISK_NEWCHANGE);*/
 733                 return 1;
 734         } else {
 735                 UDRS->last_checked=jiffies;
 736                 UCLEARF(FD_DISK_NEWCHANGE);
 737         }
 738         return 0;
 739 }
 740 
 741 static inline int is_selected(int dor, int unit)
     /*  */
 742 {
 743         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 744 }
 745 
 746 static int set_dor(int fdc, char mask, char data)
     /*  */
 747 {
 748         register unsigned char drive, unit, newdor,olddor;
 749 
 750         if(FDCS->address == -1)
 751                 return -1;
 752 
 753         olddor = FDCS->dor;
 754         newdor =  (olddor & mask) | data;
 755         if ( newdor != olddor ){
 756                 unit = olddor & 0x3;
 757                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 758                         drive = REVDRIVE(fdc,unit);
 759 #ifdef DCL_DEBUG
 760                         if (UDP->flags & FD_DEBUG){
 761                                 DPRINT("calling disk change from set_dor\n");
 762                         }
 763 #endif
 764                         disk_change(drive);
 765                 }
 766                 FDCS->dor = newdor;
 767                 fd_outb(newdor, FD_DOR);
 768 
 769                 unit = newdor & 0x3;
 770                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 771                         drive = REVDRIVE(fdc,unit);
 772                         UDRS->select_date = jiffies;
 773                 }
 774         }
 775         if ( newdor & 0xf0 )
 776                 floppy_grab_irq_and_dma();
 777         if( olddor & 0xf0 )
 778                 floppy_release_irq_and_dma();
 779         return olddor;
 780 }
 781 
 782 static void twaddle(void)
     /*  */
 783 {
 784         if (DP->select_delay)
 785                 return;
 786         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 787         fd_outb(FDCS->dor, FD_DOR);
 788         DRS->select_date = jiffies;
 789 }
 790 
 791 /* reset all driver information about the current fdc. This is needed after
 792  * a reset, and after a raw command. */
 793 static void reset_fdc_info(int mode)
     /*  */
 794 {
 795         int drive;
 796 
 797         FDCS->spec1 = FDCS->spec2 = -1;
 798         FDCS->need_configure = 1;
 799         FDCS->perp_mode = 1;
 800         FDCS->rawcmd = 0;
 801         for ( drive = 0; drive < N_DRIVE; drive++)
 802                 if (FDC(drive) == fdc &&
 803                     ( mode || UDRS->track != NEED_1_RECAL))
 804                         UDRS->track = NEED_2_RECAL;
 805 }
 806 
 807 /* selects the fdc and drive, and enables the fdc's input/dma. */
 808 static void set_fdc(int drive)
     /*  */
 809 {
 810         if (drive >= 0 && drive < N_DRIVE){
 811                 fdc = FDC(drive);
 812                 current_drive = drive;
 813         }
 814         set_dor(fdc,~0,8);
 815         set_dor(1-fdc, ~8, 0);
 816         if ( FDCS->rawcmd == 2 )
 817                 reset_fdc_info(1);
 818         if ( fd_inb(FD_STATUS) != STATUS_READY )
 819                 FDCS->reset = 1;
 820 }
 821 
 822 /* locks the driver */
 823 static int lock_fdc(int drive, int interruptible)
     /*  */
 824 {
 825         if(!usage_count){
 826                 printk("trying to lock fdc while usage count=0\n");
 827                 return -1;
 828         }
 829         floppy_grab_irq_and_dma();
 830         cli();
 831         while (fdc_busy && NO_SIGNAL)
 832                 interruptible_sleep_on(&fdc_wait);
 833         if(fdc_busy){
 834                 sti();
 835                 return -EINTR;
 836         }
 837         fdc_busy = 1;
 838         sti();
 839         command_status = FD_COMMAND_NONE;
 840         set_fdc(drive);
 841         reschedule_timeout(drive, "lock fdc", 0);
 842         return 0;
 843 }
 844 
 845 #define LOCK_FDC(drive,interruptible) \
 846 if(lock_fdc(drive,interruptible)) return -EINTR;
 847 
 848 
 849 /* unlocks the driver */
 850 static inline void unlock_fdc(void)
     /*  */
 851 {
 852         raw_cmd = 0;
 853         if (!fdc_busy)
 854                 DPRINT("FDC access conflict!\n");
 855 
 856         if ( DEVICE_INTR )
 857                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 858                         DEVICE_INTR);
 859         command_status = FD_COMMAND_NONE;
 860         del_timer(&fd_timeout);
 861         cont = NULL;
 862         fdc_busy = 0;
 863         floppy_release_irq_and_dma();
 864         wake_up(&fdc_wait);
 865 }
 866 
 867 /* switches the motor off after a given timeout */
 868 static void motor_off_callback(unsigned long nr)
     /*  */
 869 {
 870         unsigned char mask = ~(0x10 << UNIT(nr));
 871 
 872         set_dor( FDC(nr), mask, 0 );
 873 }
 874 
 875 static struct timer_list motor_off_timer[N_DRIVE] = {
 876         { NULL, NULL, 0, 0, motor_off_callback },
 877         { NULL, NULL, 0, 1, motor_off_callback },
 878         { NULL, NULL, 0, 2, motor_off_callback },
 879         { NULL, NULL, 0, 3, motor_off_callback },
 880         { NULL, NULL, 0, 4, motor_off_callback },
 881         { NULL, NULL, 0, 5, motor_off_callback },
 882         { NULL, NULL, 0, 6, motor_off_callback },
 883         { NULL, NULL, 0, 7, motor_off_callback }
 884 };
 885 
 886 /* schedules motor off */
 887 static void floppy_off(unsigned int drive)
     /*  */
 888 {
 889         unsigned long volatile delta;
 890         register int fdc=FDC(drive);
 891 
 892         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 893                 return;
 894 
 895         del_timer(motor_off_timer+drive);
 896 
 897         /* make spindle stop in a position which minimizes spinup time
 898          * next time */
 899         if (UDP->rps ){
 900                 delta = jiffies - UDRS->first_read_date + HZ -
 901                         UDP->spindown_offset;
 902                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 903                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 904         }
 905         add_timer(motor_off_timer+drive);
 906 }
 907 
 908 /*
 909  * cycle through all N_DRIVE floppy drives, for disk change testing.
 910  * stopping at current drive. This is done before any long operation, to
 911  * be sure to have up to date disk change information.
 912  */
 913 static void scandrives(void)
     /*  */
 914 {
 915         int i, drive, saved_drive;
 916 
 917         if (DP->select_delay)
 918                 return;
 919 
 920         saved_drive = current_drive;
 921         for(i=0; i< N_DRIVE; i++){
 922                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 923                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 924                         continue; /* skip closed drives */
 925                 set_fdc(drive);
 926                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 927                       (0x10 << UNIT(drive))))
 928                         /* switch the motor off again, if it was off to
 929                          * begin with */
 930                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 931         }
 932         set_fdc(saved_drive);
 933 }
 934 
 935 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 936 
 937 /* this function makes sure that the disk stays in the drive during the
 938  * transfer */
 939 static void fd_watchdog(void)
     /*  */
 940 {
 941 #ifdef DCL_DEBUG
 942         if (DP->flags & FD_DEBUG){
 943                 DPRINT("calling disk change from watchdog\n");
 944         }
 945 #endif
 946 
 947         if ( disk_change(current_drive) ){
 948                 DPRINT("disk removed during i/o\n");
 949                 floppy_shutdown();
 950         } else {
 951                 del_timer(&fd_timer);
 952                 fd_timer.function = (timeout_fn) fd_watchdog;
 953                 fd_timer.expires = jiffies + HZ / 10;
 954                 add_timer(&fd_timer);
 955         }
 956 }
 957 
 958 static void main_command_interrupt(void)
     /*  */
 959 {
 960         del_timer(&fd_timer);
 961         cont->interrupt();
 962 }
 963 
 964 /* waits for a delay (spinup or select) to pass */
 965 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 966 {
 967         if ( FDCS->reset ){
 968                 reset_fdc(); /* do the reset during sleep to win time
 969                               * if we don't need to sleep, it's a good
 970                               * occasion anyways */
 971                 return 1;
 972         }
 973 
 974         if ( jiffies < delay ){
 975                 del_timer(&fd_timer);
 976                 fd_timer.function = function;
 977                 fd_timer.expires = delay;
 978                 add_timer(&fd_timer);
 979                 return 1;
 980         }
 981         return 0;
 982 }
 983 
 984 static int hlt_disabled=0;
 985 static void floppy_disable_hlt(void)
     /*  */
 986 {
 987         unsigned long flags;
 988         save_flags(flags);
 989         cli();
 990         if(!hlt_disabled){
 991                 hlt_disabled=1;
 992 #ifdef HAVE_DISABLE_HLT
 993                 disable_hlt();
 994 #endif
 995         }
 996         restore_flags(flags);
 997 }
 998 
 999 static void floppy_enable_hlt(void)
     /*  */
1000 {
1001         unsigned long flags;
1002         save_flags(flags);
1003         cli();
1004         if(hlt_disabled){
1005                 hlt_disabled=0;
1006 #ifdef HAVE_DISABLE_HLT
1007                 enable_hlt();
1008 #endif
1009         }
1010         restore_flags(flags);
1011 }
1012 
1013 
1014 static void setup_DMA(void)
     /*  */
1015 {
1016 #ifdef FLOPPY_SANITY_CHECK
1017         if (raw_cmd->length == 0){
1018                 int i;
1019 
1020                 printk("zero dma transfer size:");
1021                 for(i=0; i< raw_cmd->cmd_count; i++)
1022                         printk("%x,", raw_cmd->cmd[i]);
1023                 printk("\n");
1024                 cont->done(0);
1025                 FDCS->reset = 1;
1026                 return;
1027         }
1028 #if 0
1029         /* disabled because of new buffer location for raw cmd */
1030         if ((!CURRENT ||
1031              CURRENT->buffer != raw_cmd->kernel_data ||
1032              raw_cmd->length > 512 * CURRENT->nr_sectors) &&
1033             (raw_cmd->kernel_data < floppy_track_buffer ||
1034              raw_cmd->kernel_data + raw_cmd->length >
1035              floppy_track_buffer + 1024 * max_buffer_sectors)){
1036                 printk("bad address. start=%p lg=%lx tb=%p\n",
1037                        raw_cmd->kernel_data, raw_cmd->length, 
1038                        floppy_track_buffer);
1039                 if ( CURRENT ){
1040                         printk("buffer=%p nr=%lx cnr=%lx\n",
1041                                CURRENT->buffer, CURRENT->nr_sectors,
1042                                CURRENT->current_nr_sectors);
1043                 }
1044                 cont->done(0);
1045                 FDCS->reset=1;
1046                 return;
1047         }
1048 #endif
1049         if ((long) raw_cmd->kernel_data % 512 ){
1050                 printk("non aligned address: %p\n", raw_cmd->kernel_data );
1051                 cont->done(0);
1052                 FDCS->reset=1;
1053                 return;
1054         }
1055         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
1056                 printk("DMA crossing 64-K boundary %p-%p\n",
1057                        raw_cmd->kernel_data,
1058                        raw_cmd->kernel_data + raw_cmd->length);
1059                 cont->done(0);
1060                 FDCS->reset=1;
1061                 return;
1062         }
1063 #endif
1064         cli();
1065         fd_disable_dma();
1066         fd_clear_dma_ff();
1067         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1068                          DMA_MODE_READ : DMA_MODE_WRITE);
1069         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1070         fd_set_dma_count(raw_cmd->length);
1071         fd_enable_dma();
1072         sti();
1073         floppy_disable_hlt();
1074 }
1075 
1076 /* sends a command byte to the fdc */
1077 static int output_byte(char byte)
     /*  */
1078 {
1079         int counter;
1080         unsigned char status = 0;
1081         unsigned char rstatus;
1082 
1083         if (FDCS->reset)
1084                 return -1;
1085         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1086                 rstatus = fd_inb(FD_STATUS);
1087                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1088                 if (!(status & STATUS_READY))
1089                         continue;
1090                 if (status == STATUS_READY){
1091                         fd_outb(byte,FD_DATA);
1092 
1093 #ifdef FLOPPY_SANITY_CHECK
1094                         output_log[output_log_pos].data = byte;
1095                         output_log[output_log_pos].status = rstatus;
1096                         output_log[output_log_pos].jiffies = jiffies;
1097                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1098 #endif
1099                         return 0;
1100                 } else
1101                         break;
1102         }
1103         FDCS->reset = 1;
1104         if ( !initialising )
1105                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1106                         byte, status);
1107         return -1;
1108 }
1109 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
1110 
1111 /* gets the response from the fdc */
1112 static int result(void)
     /*  */
1113 {
1114         int i = 0, counter, status = 0;
1115 
1116         if (FDCS->reset)
1117                 return -1;
1118         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1119                 status = fd_inb(FD_STATUS)&
1120                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1121                 if (!(status & STATUS_READY))
1122                         continue;
1123                 if (status == STATUS_READY){
1124 #ifdef FLOPPY_SANITY_CHECK
1125                         resultjiffies = jiffies;
1126                         resultsize = i;
1127 #endif
1128                         return i;
1129                 }
1130                 if (status & STATUS_DMA )
1131                         break;
1132                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1133                         if (i >= MAX_REPLIES) {
1134                                 DPRINT("floppy_stat reply overrun\n");
1135                                 break;
1136                         }
1137                         reply_buffer[i++] = fd_inb(FD_DATA);
1138                 }
1139         }
1140         FDCS->reset = 1;
1141         if ( !initialising )
1142                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1143                         status, fdc, i);
1144         return -1;
1145 }
1146 
1147 /* Set perpendicular mode as required, based on data rate, if supported.
1148  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1149  */
1150 static inline void perpendicular_mode(void)
     /*  */
1151 {
1152         unsigned char perp_mode;
1153 
1154         if (!floppy)
1155                 return;
1156         if (floppy->rate & 0x40){
1157                 switch(raw_cmd->rate){
1158                         case 0:
1159                                 perp_mode=2;
1160                                 break;
1161                         case 3:
1162                                 perp_mode=3;
1163                                 break;
1164                         default:
1165                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1166                                 cont->done(0);
1167                                 FDCS->reset = 1; /* convenient way to return to
1168                                                   * redo without to much hassle (deep
1169                                                   * stack et al. */
1170                                 return;
1171                 }
1172         } else
1173                 perp_mode = 0;
1174 
1175         if ( FDCS->perp_mode == perp_mode )
1176                 return;
1177         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1178                 output_byte(FD_PERPENDICULAR);
1179                 output_byte(perp_mode);
1180                 FDCS->perp_mode = perp_mode;
1181         } else if (perp_mode) {
1182                 DPRINT("perpendicular mode not supported by this FDC.\n");
1183         }
1184 } /* perpendicular_mode */
1185 
1186 #define NOMINAL_DTR 500
1187 
1188 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1189  * head load time, and DMA disable flag to values needed by floppy.
1190  *
1191  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1192  * to account for the data rate-based scaling done by the 82072 and 82077
1193  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1194  * 8272a).
1195  *
1196  * Note that changing the data transfer rate has a (probably deleterious)
1197  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1198  * fdc_specify is called again after each data transfer rate
1199  * change.
1200  *
1201  * srt: 1000 to 16000 in microseconds
1202  * hut: 16 to 240 milliseconds
1203  * hlt: 2 to 254 milliseconds
1204  *
1205  * These values are rounded up to the next highest available delay time.
1206  */
1207 static void fdc_specify(void)
     /*  */
1208 {
1209         unsigned char spec1, spec2;
1210         int srt, hlt, hut;
1211         unsigned long dtr = NOMINAL_DTR;
1212         unsigned long scale_dtr = NOMINAL_DTR;
1213         int hlt_max_code = 0x7f;
1214         int hut_max_code = 0xf;
1215 
1216         if (FDCS->need_configure && FDCS->has_fifo) {
1217                 if ( FDCS->reset )
1218                         return;
1219                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1220                 /* TODO: lock this in via LOCK during initialization */
1221                 output_byte(FD_CONFIGURE);
1222                 output_byte(0);
1223                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1224                 output_byte(0);         /* precompensation from track 0 upwards */
1225                 if ( FDCS->reset ){
1226                         FDCS->has_fifo=0;
1227                         return;
1228                 }
1229                 FDCS->need_configure = 0;
1230                 /*DPRINT("FIFO enabled\n");*/
1231         }
1232 
1233         switch (raw_cmd->rate & 0x03) {
1234                 case 3:
1235                         dtr = 1000;
1236                         break;
1237                 case 1:
1238                         dtr = 300;
1239                         break;
1240                 case 2:
1241                         dtr = 250;
1242                         break;
1243         }
1244 
1245         if (FDCS->version >= FDC_82072) {
1246                 scale_dtr = dtr;
1247                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1248                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1249         }
1250 
1251         /* Convert step rate from microseconds to milliseconds and 4 bits */
1252         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1253         if (srt > 0xf)
1254                 srt = 0xf;
1255         else if (srt < 0)
1256                 srt = 0;
1257 
1258         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1259         if (hlt < 0x01)
1260                 hlt = 0x01;
1261         else if (hlt > 0x7f)
1262                 hlt = hlt_max_code;
1263 
1264         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1265         if (hut < 0x1)
1266                 hut = 0x1;
1267         else if (hut > 0xf)
1268                 hut = hut_max_code;
1269 
1270         spec1 = (srt << 4) | hut;
1271         spec2 = (hlt << 1);
1272 
1273         /* If these parameters did not change, just return with success */
1274         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1275                 /* Go ahead and set spec1 and spec2 */
1276                 output_byte(FD_SPECIFY);
1277                 output_byte(FDCS->spec1 = spec1);
1278                 output_byte(FDCS->spec2 = spec2);
1279         }
1280 } /* fdc_specify */
1281 
1282 /* Set the FDC's data transfer rate on behalf of the specified drive.
1283  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1284  * of the specify command (i.e. using the fdc_specify function).
1285  */
1286 static int fdc_dtr(void)
     /*  */
1287 {
1288         /* If data rate not already set to desired value, set it. */
1289         if ( raw_cmd->rate == FDCS->dtr)
1290                 return 0;
1291 
1292         /* Set dtr */
1293         fd_outb(raw_cmd->rate, FD_DCR);
1294 
1295         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1296          * need a stabilization period of several milliseconds to be
1297          * enforced after data rate changes before R/W operations.
1298          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1299          */
1300         FDCS->dtr = raw_cmd->rate;
1301         return(wait_for_completion(jiffies+2*HZ/100,
1302                                    (timeout_fn) floppy_ready));
1303 } /* fdc_dtr */
1304 
1305 static void tell_sector(void)
     /*  */
1306 {
1307         printk(": track %d, head %d, sector %d, size %d",
1308                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1309 } /* tell_sector */
1310 
1311 
1312 /*
1313  * Ok, this error interpreting routine is called after a
1314  * DMA read/write has succeeded
1315  * or failed, so we check the results, and copy any buffers.
1316  * hhb: Added better error reporting.
1317  * ak: Made this into a separate routine.
1318  */
1319 static int interpret_errors(void)
     /*  */
1320 {
1321         char bad;
1322 
1323         if (inr!=7) {
1324                 DPRINT("-- FDC reply error");
1325                 FDCS->reset = 1;
1326                 return 1;
1327         }
1328 
1329         /* check IC to find cause of interrupt */
1330         switch (ST0 & ST0_INTR) {
1331                 case 0x40:      /* error occurred during command execution */
1332                         bad = 1;
1333                         if (ST1 & ST1_WP) {
1334                                 DPRINT("Drive is write protected\n");
1335                                 CLEARF(FD_DISK_WRITABLE);
1336                                 cont->done(0);
1337                                 bad = 2;
1338                         } else if (ST1 & ST1_ND) {
1339                                 SETF(FD_NEED_TWADDLE);
1340                         } else if (ST1 & ST1_OR) {
1341                                 if (DP->flags & FTD_MSG )
1342                                         DPRINT("Over/Underrun - retrying\n");
1343                                 bad = 0;
1344                         }else if(*errors >= DP->max_errors.reporting){
1345                                 DPRINT("");
1346                                 if (ST0 & ST0_ECE) {
1347                                         printk("Recalibrate failed!");
1348                                 } else if (ST2 & ST2_CRC) {
1349                                         printk("data CRC error");
1350                                         tell_sector();
1351                                 } else if (ST1 & ST1_CRC) {
1352                                         printk("CRC error");
1353                                         tell_sector();
1354                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1355                                         if (!probing) {
1356                                                 printk("sector not found");
1357                                                 tell_sector();
1358                                         } else
1359                                                 printk("probe failed...");
1360                                 } else if (ST2 & ST2_WC) {      /* seek error */
1361                                         printk("wrong cylinder");
1362                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1363                                         printk("bad cylinder");
1364                                 } else {
1365                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1366                                         tell_sector();
1367                                 }
1368                                 printk("\n");
1369 
1370                         }
1371                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1372                                 /* wrong cylinder => recal */
1373                                 DRS->track = NEED_2_RECAL;
1374                         return bad;
1375                 case 0x80: /* invalid command given */
1376                         DPRINT("Invalid FDC command given!\n");
1377                         cont->done(0);
1378                         return 2;
1379                 case 0xc0:
1380                         DPRINT("Abnormal termination caused by polling\n");
1381                         cont->error();
1382                         return 2;
1383                 default: /* (0) Normal command termination */
1384                         return 0;
1385         }
1386 }
1387 
1388 /*
1389  * This routine is called when everything should be correctly set up
1390  * for the transfer (ie floppy motor is on, the correct floppy is
1391  * selected, and the head is sitting on the right track).
1392  */
1393 static void setup_rw_floppy(void)
     /*  */
1394 {
1395         int i,ready_date,r, flags,dflags;
1396         timeout_fn function;
1397 
1398         flags = raw_cmd->flags;
1399         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1400                 flags |= FD_RAW_INTR;
1401 
1402         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1403                 ready_date = DRS->spinup_date + DP->spinup;
1404                 /* If spinup will take a long time, rerun scandrives
1405                  * again just before spinup completion. Beware that
1406                  * after scandrives, we must again wait for selection.
1407                  */
1408                 if ( ready_date > jiffies + DP->select_delay){
1409                         ready_date -= DP->select_delay;
1410                         function = (timeout_fn) floppy_start;
1411                 } else
1412                         function = (timeout_fn) setup_rw_floppy;
1413 
1414                 /* wait until the floppy is spinning fast enough */
1415                 if (wait_for_completion(ready_date,function))
1416                         return;
1417         }
1418         dflags = DRS->flags;
1419 
1420         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1421                 setup_DMA();
1422 
1423         if ( flags & FD_RAW_INTR )
1424                 SET_INTR(main_command_interrupt);
1425 
1426         r=0;
1427         for(i=0; i< raw_cmd->cmd_count; i++)
1428                 r|=output_byte( raw_cmd->cmd[i] );
1429 
1430 #ifdef DEBUGT
1431         debugt("rw_command: ");
1432 #endif
1433         if ( r ){
1434                 reset_fdc();
1435                 return;
1436         }
1437 
1438         if ( ! ( flags & FD_RAW_INTR )){
1439                 inr = result();
1440                 cont->interrupt();
1441         } else if ( flags & FD_RAW_NEED_DISK )
1442                 fd_watchdog();
1443 }
1444 
1445 static int blind_seek;
1446 
1447 /*
1448  * This is the routine called after every seek (or recalibrate) interrupt
1449  * from the floppy controller.
1450  */
1451 static void seek_interrupt(void)
     /*  */
1452 {
1453 #ifdef DEBUGT
1454         debugt("seek interrupt:");
1455 #endif
1456         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1457                 DPRINT("seek failed\n");
1458                 DRS->track = NEED_2_RECAL;
1459                 cont->error();
1460                 cont->redo();
1461                 return;
1462         }
1463         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1464 #ifdef DCL_DEBUG
1465                 if (DP->flags & FD_DEBUG){
1466                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1467                         DPRINT1("jiffies=%ld\n", jiffies);
1468                 }
1469 #endif
1470                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1471                 DRS->select_date = jiffies;
1472         }
1473         DRS->track = ST1;
1474         floppy_ready();
1475 }
1476 
1477 static void check_wp(void)
     /*  */
1478 {
1479         if (TESTF(FD_VERIFY)) {
1480                 /* check write protection */
1481                 output_byte( FD_GETSTATUS );
1482                 output_byte( UNIT(current_drive) );
1483                 if ( result() != 1 ){
1484                         FDCS->reset = 1;
1485                         return;
1486                 }
1487                 CLEARF(FD_VERIFY);
1488                 CLEARF(FD_NEED_TWADDLE);
1489 #ifdef DCL_DEBUG
1490                 if (DP->flags & FD_DEBUG){
1491                         DPRINT("checking whether disk is write protected\n");
1492                         DPRINT1("wp=%x\n",ST3 & 0x40);
1493                 }
1494 #endif
1495                 if (!( ST3  & 0x40))
1496                         SETF(FD_DISK_WRITABLE);
1497                 else
1498                         CLEARF(FD_DISK_WRITABLE);
1499         }
1500 }
1501 
1502 static void seek_floppy(void)
     /*  */
1503 {
1504         int track;
1505 
1506         blind_seek=0;
1507 
1508 #ifdef DCL_DEBUG
1509         if (DP->flags & FD_DEBUG){
1510                 DPRINT("calling disk change from seek\n");
1511         }
1512 #endif
1513 
1514         if (!TESTF(FD_DISK_NEWCHANGE) &&
1515             disk_change(current_drive) &&
1516             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1517                 /* the media changed flag should be cleared after the seek.
1518                  * If it isn't, this means that there is really no disk in
1519                  * the drive.
1520                  */
1521                 SETF(FD_DISK_CHANGED);
1522                 cont->done(0);
1523                 cont->redo();
1524                 return;
1525         }
1526         if ( DRS->track <= NEED_1_RECAL ){
1527                 recalibrate_floppy();
1528                 return;
1529         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1530                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1531                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1532                 /* we seek to clear the media-changed condition. Does anybody
1533                  * know a more elegant way, which works on all drives? */
1534                 if ( raw_cmd->track )
1535                         track = raw_cmd->track - 1;
1536                 else {
1537                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1538                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1539                                 blind_seek = 1;
1540                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1541                         }
1542                         track = 1;
1543                 }
1544         } else {
1545                 check_wp();
1546                 if (raw_cmd->track != DRS->track &&
1547                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1548                         track = raw_cmd->track;
1549                 else {
1550                         setup_rw_floppy();
1551                         return;
1552                 }
1553         }
1554 
1555         SET_INTR(seek_interrupt);
1556         output_byte(FD_SEEK);
1557         output_byte(UNIT(current_drive));
1558         LAST_OUT(track);
1559 #ifdef DEBUGT
1560         debugt("seek command:");
1561 #endif
1562 }
1563 
1564 static void recal_interrupt(void)
     /*  */
1565 {
1566 #ifdef DEBUGT
1567         debugt("recal interrupt:");
1568 #endif
1569         if (inr !=2 )
1570                 FDCS->reset = 1;
1571         else if (ST0 & ST0_ECE) {
1572                 switch(DRS->track){
1573                         case NEED_1_RECAL:
1574 #ifdef DEBUGT
1575                                 debugt("recal interrupt need 1 recal:");
1576 #endif
1577                                 /* after a second recalibrate, we still haven't
1578                                  * reached track 0. Probably no drive. Raise an
1579                                  * error, as failing immediately might upset
1580                                  * computers possessed by the Devil :-) */
1581                                 cont->error();
1582                                 cont->redo();
1583                                 return;
1584                         case NEED_2_RECAL:
1585 #ifdef DEBUGT
1586                                 debugt("recal interrupt need 2 recal:");
1587 #endif
1588                                 /* If we already did a recalibrate,
1589                                  * and we are not at track 0, this
1590                                  * means we have moved. (The only way
1591                                  * not to move at recalibration is to
1592                                  * be already at track 0.) Clear the
1593                                  * new change flag */
1594 #ifdef DCL_DEBUG
1595                                 if (DP->flags & FD_DEBUG){
1596                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1597                                 }
1598 #endif
1599 
1600                                 CLEARF(FD_DISK_NEWCHANGE);
1601                                 DRS->select_date = jiffies;
1602                                 /* fall through */
1603                         default:
1604 #ifdef DEBUGT
1605                                 debugt("recal interrupt default:");
1606 #endif
1607                                 /* Recalibrate moves the head by at
1608                                  * most 80 steps. If after one
1609                                  * recalibrate we don't have reached
1610                                  * track 0, this might mean that we
1611                                  * started beyond track 80.  Try
1612                                  * again.  */
1613                                 DRS->track = NEED_1_RECAL;
1614                                 break;
1615                 }
1616         } else
1617                 DRS->track = ST1;
1618         floppy_ready();
1619 }
1620 
1621 /*
1622  * Unexpected interrupt - Print as much debugging info as we can...
1623  * All bets are off...
1624  */
1625 static void unexpected_floppy_interrupt(void)
     /*  */
1626 {
1627         int i;
1628         if ( initialising )
1629                 return;
1630         if(print_unex){
1631                 DPRINT("unexpected interrupt\n");
1632                 if ( inr >= 0 )
1633                         for(i=0; i<inr; i++)
1634                                 printk("%d %x\n", i, reply_buffer[i] );
1635         }
1636         while(1){
1637                 output_byte(FD_SENSEI);
1638                 inr=result();
1639                 if ( inr != 2 )
1640                         break;
1641                 if(print_unex){
1642                         printk("sensei\n");
1643                         for(i=0; i<inr; i++)
1644                                 printk("%d %x\n", i, reply_buffer[i] );
1645                 }
1646         }
1647         FDCS->reset = 1;
1648 }
1649 
1650 struct tq_struct floppy_tq =
1651 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1652 
1653 /* interrupt handler */
1654 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1655 {
1656         void (*handler)(void) = DEVICE_INTR;
1657 
1658         lasthandler = handler;
1659         interruptjiffies = jiffies;
1660 
1661         floppy_enable_hlt();
1662         CLEAR_INTR;
1663         if ( fdc >= N_FDC || FDCS->address == -1){
1664                 /* we don't even know which FDC is the culprit */
1665                 printk("DOR0=%x\n", fdc_state[0].dor);
1666                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1667                 printk("handler=%p\n", handler);
1668                 is_alive("bizarre fdc");
1669                 return;
1670         }
1671         inr = result();
1672         if (!handler){
1673                 unexpected_floppy_interrupt();
1674                 is_alive("unexpected");
1675                 return;
1676         }
1677         if ( inr == 0 ){
1678                 do {
1679                         output_byte(FD_SENSEI);
1680                         inr = result();
1681                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1682         }
1683         floppy_tq.routine = (void *)(void *) handler;
1684         queue_task_irq(&floppy_tq, &tq_timer);
1685         is_alive("normal interrupt end");
1686 }
1687 
1688 static void recalibrate_floppy(void)
     /*  */
1689 {
1690 #ifdef DEBUGT
1691         debugt("recalibrate floppy:");
1692 #endif
1693         SET_INTR(recal_interrupt);
1694         output_byte(FD_RECALIBRATE);
1695         LAST_OUT(UNIT(current_drive));
1696 }
1697 
1698 /*
1699  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1700  */
1701 static void reset_interrupt(void)
     /*  */
1702 {
1703 #ifdef DEBUGT
1704         debugt("reset interrupt:");
1705 #endif
1706         /* fdc_specify();          reprogram fdc */
1707         result();               /* get the status ready for set_fdc */
1708         if ( FDCS->reset )
1709                 cont->error(); /* a reset just after a reset. BAD! */
1710         cont->redo();
1711 }
1712 
1713 /*
1714  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1715  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1716  */
1717 static void reset_fdc(void)
     /*  */
1718 {
1719         SET_INTR(reset_interrupt);
1720         FDCS->reset = 0;
1721         reset_fdc_info(0);
1722         if ( FDCS->version >= FDC_82077 )
1723                 fd_outb(0x80 | ( FDCS->dtr &3), FD_STATUS);
1724         else {
1725                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1726                 udelay(FD_RESET_DELAY);
1727                 fd_outb(FDCS->dor, FD_DOR);
1728         }
1729 }
1730 
1731 static void empty(void)
     /*  */
1732 {
1733 }
1734 
1735 void show_floppy(void)
     /*  */
1736 {
1737         int i;
1738 
1739         printk("\n");
1740         printk("floppy driver state\n");
1741         printk("-------------------\n");
1742         printk("now=%ld last interrupt=%d last called handler=%p\n",
1743                jiffies, interruptjiffies, lasthandler);
1744 
1745 
1746 #ifdef FLOPPY_SANITY_CHECK
1747         printk("timeout_message=%s\n", timeout_message);
1748         printk("last output bytes:\n");
1749         for(i=0; i < OLOGSIZE; i++)
1750                 printk("%2x %2x %ld\n",
1751                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1752                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1753                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1754         printk("last result at %d\n", resultjiffies);
1755         printk("last redo_fd_request at %d\n", lastredo);
1756         for(i=0; i<resultsize; i++){
1757                 printk("%2x ", reply_buffer[i]);
1758         }
1759         printk("\n");
1760 #endif
1761 
1762 #if 0
1763         for(i=0; i<N_FDC; i++){
1764                 if(FDCS->address != -1){
1765                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1766                         fd_outb(fdc_state[i].address+2, fdc_state[i].dor);
1767                         udelay(1000); /* maybe we'll catch an interrupt... */
1768                 }
1769         }
1770 #endif
1771         printk("status=%x\n", fd_inb(FD_STATUS));
1772         printk("fdc_busy=%d\n", fdc_busy);
1773         if( DEVICE_INTR)
1774                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1775         if(floppy_tq.sync)
1776                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1777         if(fd_timer.prev)
1778                 printk("fd_timer.function=%p\n", fd_timer.function);
1779         if(fd_timeout.prev){
1780                 printk("timer_table=%p\n",fd_timeout.function);
1781                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1782                 printk("now=%ld\n",jiffies);
1783         }
1784         printk("cont=%p\n", cont);
1785         printk("CURRENT=%p\n", CURRENT);
1786         printk("command_status=%d\n", command_status);
1787         printk("\n");
1788 }
1789 
1790 static void floppy_shutdown(void)
     /*  */
1791 {
1792         if(!initialising)
1793                 show_floppy();
1794         CLEAR_INTR;
1795         floppy_tq.routine = (void *)(void *) empty;
1796         del_timer( &fd_timer);
1797         sti();
1798 
1799         floppy_enable_hlt();
1800         fd_disable_dma();
1801         /* avoid dma going to a random drive after shutdown */
1802 
1803         if(!initialising)
1804                 DPRINT("floppy timeout\n");
1805         FDCS->reset = 1;
1806         if (cont){
1807                 cont->done(0);
1808                 cont->redo(); /* this will recall reset when needed */
1809         } else {
1810                 printk("no cont in shutdown!\n");
1811                 process_fd_request();
1812         }
1813         is_alive("floppy shutdown");
1814 }
1815 /*typedef void (*timeout_fn)(unsigned long);*/
1816 
1817 /* start motor, check media-changed condition and write protection */
1818 static int start_motor( void (*function)(void)  )
     /*  */
1819 {
1820         int mask, data;
1821 
1822         mask = 0xfc;
1823         data = UNIT(current_drive);
1824         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1825                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1826                         set_debugt();
1827                         /* no read since this drive is running */
1828                         DRS->first_read_date = 0;
1829                         /* note motor start time if motor is not yet running */
1830                         DRS->spinup_date = jiffies;
1831                         data |= (0x10 << UNIT(current_drive));
1832                 }
1833         } else
1834                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1835                         mask &= ~(0x10 << UNIT(current_drive));
1836 
1837         /* starts motor and selects floppy */
1838         del_timer(motor_off_timer + current_drive);
1839         set_dor( fdc, mask, data);
1840 
1841         /* wait_for_completion also schedules reset if needed. */
1842         return(wait_for_completion(DRS->select_date+DP->select_delay,
1843                                    (timeout_fn) function));
1844 }
1845 
1846 static void floppy_ready(void)
     /*  */
1847 {
1848         CHECK_RESET;
1849         if(start_motor(floppy_ready)) return;
1850         if(fdc_dtr()) return;
1851 
1852 #ifdef DCL_DEBUG
1853         if (DP->flags & FD_DEBUG){
1854                 DPRINT("calling disk change from floppy_ready\n");
1855         }
1856 #endif
1857 
1858         if(!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1859            disk_change(current_drive) &&
1860            !DP->select_delay)
1861                 twaddle(); /* this clears the dcl on certain drive/controller
1862                             * combinations */
1863 
1864         if ( raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1865                 perpendicular_mode();
1866                 fdc_specify(); /* must be done here because of hut, hlt ... */
1867                 seek_floppy();
1868         } else
1869                 setup_rw_floppy();
1870 }
1871 
1872 static void floppy_start(void)
     /*  */
1873 {
1874         reschedule_timeout(CURRENTD, "floppy start", 0);
1875 
1876         scandrives();
1877 #ifdef DCL_DEBUG
1878         if (DP->flags & FD_DEBUG){
1879                 DPRINT("setting NEWCHANGE in floppy_start\n");
1880         }
1881 #endif
1882         SETF(FD_DISK_NEWCHANGE);
1883         floppy_ready();
1884 }
1885 
1886 /*
1887  * ========================================================================
1888  * here ends the bottom half. Exported routines are:
1889  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1890  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1891  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1892  * and set_dor.
1893  * ========================================================================
1894  */
1895 /*
1896  * General purpose continuations.
1897  * ==============================
1898  */
1899 
1900 static void do_wakeup(void)
     /*  */
1901 {
1902         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1903         cont = 0;
1904         command_status += 2;
1905         wake_up(&command_done);
1906 }
1907 
1908 static struct cont_t wakeup_cont={
1909         empty,
1910         do_wakeup,
1911         empty,
1912         (done_f)empty
1913 };
1914 
1915 static int wait_til_done(void (*handler)(void ), int interruptible)
     /*  */
1916 {
1917         int ret;
1918 
1919         floppy_tq.routine = (void *)(void *) handler;
1920         queue_task(&floppy_tq, &tq_timer);
1921 
1922         cli();
1923         while(command_status < 2 && NO_SIGNAL){
1924                 is_alive("wait_til_done");
1925                 if(interruptible)
1926                         interruptible_sleep_on(&command_done);
1927                 else
1928                         sleep_on(&command_done);
1929         }
1930         if(command_status < 2){
1931                 floppy_shutdown();
1932                 sti();
1933                 process_fd_request();
1934                 return -EINTR;
1935         }
1936         sti();
1937 
1938         if ( FDCS->reset )
1939                 command_status = FD_COMMAND_ERROR;
1940         if ( command_status == FD_COMMAND_OKAY )
1941                 ret=0;
1942         else
1943                 ret=-EIO;
1944         command_status = FD_COMMAND_NONE;
1945         return ret;
1946 }
1947 
1948 static void generic_done(int result)
     /*  */
1949 {
1950         command_status = result;
1951         cont = &wakeup_cont;
1952 }
1953 
1954 static void generic_success(void)
     /*  */
1955 {
1956         cont->done(1);
1957 }
1958 
1959 static void generic_failure(void)
     /*  */
1960 {
1961         cont->done(0);
1962 }
1963 
1964 static void success_and_wakeup(void)
     /*  */
1965 {
1966         generic_success();
1967         cont->redo();
1968 }
1969 
1970 
1971 /*
1972  * formatting and rw support.
1973  * ==========================
1974  */
1975 
1976 static int next_valid_format(void)
     /*  */
1977 {
1978         int probed_format;
1979 
1980         probed_format = DRS->probed_format;
1981         while(1){
1982                 if ( probed_format >= 8 ||
1983                      ! DP->autodetect[probed_format] ){
1984                         DRS->probed_format = 0;
1985                         return 1;
1986                 }
1987                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1988                         DRS->probed_format = probed_format;
1989                         return 0;
1990                 }
1991                 probed_format++;
1992         }
1993 }
1994 
1995 static void bad_flp_intr(void)
     /*  */
1996 {
1997         if ( probing ){
1998                 DRS->probed_format++;
1999                 if ( !next_valid_format())
2000                         return;
2001         }
2002         (*errors)++;
2003         if (*errors > DRWE->badness)
2004                 DRWE->badness = *errors;
2005         if (*errors > DP->max_errors.abort)
2006                 cont->done(0);
2007         if (*errors > DP->max_errors.reset)
2008                 FDCS->reset = 1;
2009         else if (*errors > DP->max_errors.recal)
2010                 DRS->track = NEED_2_RECAL;
2011 }
2012 
2013 static void set_floppy(kdev_t device)
     /*  */
2014 {
2015         if (TYPE(device))
2016                 floppy = TYPE(device) + floppy_type;
2017         else
2018                 floppy = current_type[ DRIVE(device) ];
2019 }
2020 
2021 /*
2022  * formatting and support.
2023  * =======================
2024  */
2025 static void format_interrupt(void)
     /*  */
2026 {
2027         switch (interpret_errors()){
2028                 case 1:
2029                         cont->error();
2030                 case 2:
2031                         break;
2032                 case 0:
2033                         cont->done(1);
2034         }
2035         cont->redo();
2036 }
2037 
2038 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
2039 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
2040 #define CT(x) ( (x) | 0x40 )
2041 static void setup_format_params(int track)
     /*  */
2042 {
2043         struct fparm {
2044                 unsigned char track,head,sect,size;
2045         } *here = (struct fparm *)floppy_track_buffer;
2046         int il,n;
2047         int count,head_shift,track_shift;
2048 
2049         raw_cmd = &default_raw_cmd;
2050         raw_cmd->track = track;
2051 
2052         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2053                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
2054         raw_cmd->rate = floppy->rate & 0x3;
2055         raw_cmd->cmd_count = NR_F;
2056         COMMAND = FM_MODE(floppy,FD_FORMAT);
2057         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
2058         F_SIZECODE = FD_SIZECODE(floppy);
2059         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
2060         F_GAP = floppy->fmt_gap;
2061         F_FILL = FD_FILL_BYTE;
2062 
2063         raw_cmd->kernel_data = floppy_track_buffer;
2064         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2065 
2066         /* allow for about 30ms for data transport per track */
2067         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
2068 
2069         /* a ``cylinder'' is two tracks plus a little stepping time */
2070         track_shift = 2 * head_shift + 3;
2071 
2072         /* position of logical sector 1 on this track */
2073         n = (track_shift * format_req.track + head_shift * format_req.head )
2074                 % F_SECT_PER_TRACK;
2075 
2076         /* determine interleave */
2077         il = 1;
2078         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2079                 il++;
2080 
2081         /* initialize field */
2082         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2083                 here[count].track = format_req.track;
2084                 here[count].head = format_req.head;
2085                 here[count].sect = 0;
2086                 here[count].size = F_SIZECODE;
2087         }
2088         /* place logical sectors */
2089         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2090                 here[n].sect = count;
2091                 n = (n+il) % F_SECT_PER_TRACK;
2092                 if (here[n].sect) { /* sector busy, find next free sector */
2093                         ++n;
2094                         if (n>= F_SECT_PER_TRACK) {
2095                                 n-=F_SECT_PER_TRACK;
2096                                 while (here[n].sect) ++n;
2097                         }
2098                 }
2099         }
2100 }
2101 
2102 static void redo_format(void)
     /*  */
2103 {
2104         buffer_track = -1;
2105         setup_format_params(format_req.track << STRETCH(floppy));
2106         floppy_start();
2107 #ifdef DEBUGT
2108         debugt("queue format request");
2109 #endif
2110 }
2111 
2112 static struct cont_t format_cont={
2113         format_interrupt,
2114         redo_format,
2115         bad_flp_intr,
2116         generic_done };
2117 
2118 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /*  */
2119 {
2120         int ret;
2121         int drive=DRIVE(device);
2122 
2123         LOCK_FDC(drive,1);
2124         set_floppy(device);
2125         if (!floppy ||
2126             floppy->track > DP->tracks ||
2127             tmp_format_req->track >= floppy->track ||
2128             tmp_format_req->head >= floppy->head ||
2129             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2130             !floppy->fmt_gap) {
2131                 process_fd_request();
2132                 return -EINVAL;
2133         }
2134         format_req = *tmp_format_req;
2135         format_errors = 0;
2136         cont = &format_cont;
2137         errors = &format_errors;
2138         IWAIT(redo_format);
2139         process_fd_request();
2140         return ret;
2141 }
2142 
2143 /*
2144  * Buffer read/write and support
2145  * =============================
2146  */
2147 
2148 /* new request_done. Can handle physical sectors which are smaller than a
2149  * logical buffer */
2150 static void request_done(int uptodate)
     /*  */
2151 {
2152         int block;
2153 
2154         probing = 0;
2155         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2156 
2157         if (!CURRENT){
2158                 DPRINT("request list destroyed in floppy request done\n");
2159                 return;
2160         }
2161         if (uptodate){
2162                 /* maintain values for invalidation on geometry
2163                  * change */
2164                 block = current_count_sectors + CURRENT->sector;
2165                 if (block > DRS->maxblock)
2166                         DRS->maxblock=block;
2167                 if ( block > floppy->sect)
2168                         DRS->maxtrack = 1;
2169 
2170                 /* unlock chained buffers */
2171                 while (current_count_sectors && CURRENT &&
2172                        current_count_sectors >= CURRENT->current_nr_sectors ){
2173                         current_count_sectors -= CURRENT->current_nr_sectors;
2174                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2175                         CURRENT->sector += CURRENT->current_nr_sectors;
2176                         end_request(1);
2177                 }
2178                 if ( current_count_sectors && CURRENT){
2179                         /* "unlock" last subsector */
2180                         CURRENT->buffer += current_count_sectors <<9;
2181                         CURRENT->current_nr_sectors -= current_count_sectors;
2182                         CURRENT->nr_sectors -= current_count_sectors;
2183                         CURRENT->sector += current_count_sectors;
2184                         return;
2185                 }
2186 
2187                 if ( current_count_sectors && ! CURRENT )
2188                         DPRINT("request list destroyed in floppy request done\n");
2189 
2190         } else {
2191                 if(CURRENT->cmd == WRITE) {
2192                         /* record write error information */
2193                         DRWE->write_errors++;
2194                         if(DRWE->write_errors == 1) {
2195                                 DRWE->first_error_sector = CURRENT->sector;
2196                                 DRWE->first_error_generation = DRS->generation;
2197                         }
2198                         DRWE->last_error_sector = CURRENT->sector;
2199                         DRWE->last_error_generation = DRS->generation;
2200                 }
2201                 end_request(0);
2202         }
2203 }
2204 
2205 /* Interrupt handler evaluating the result of the r/w operation */
2206 static void rw_interrupt(void)
     /*  */
2207 {
2208         int nr_sectors, ssize;
2209 
2210         if ( ! DRS->first_read_date )
2211                 DRS->first_read_date = jiffies;
2212 
2213         nr_sectors = 0;
2214         CODE2SIZE;
2215         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2216                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2217                 (sector_t % floppy->sect) % ssize;
2218 
2219 #ifdef FLOPPY_SANITY_CHECK
2220         if ( nr_sectors > current_count_sectors + ssize -
2221              (current_count_sectors + sector_t) % ssize +
2222              sector_t % ssize){
2223                 DPRINT2("long rw: %x instead of %lx\n",
2224                         nr_sectors, current_count_sectors);
2225                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2226                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2227                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2228                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2229                        sector_t, ssize);
2230         }
2231 #endif
2232         if ( nr_sectors < 0 )
2233                 nr_sectors = 0;
2234         if ( nr_sectors < current_count_sectors )
2235                 current_count_sectors = nr_sectors;
2236 
2237         switch (interpret_errors()){
2238                 case 2:
2239                         cont->redo();
2240                         return;
2241                 case 1:
2242                         if (  !current_count_sectors){
2243                                 cont->error();
2244                                 cont->redo();
2245                                 return;
2246                         }
2247                         break;
2248                 case 0:
2249                         if (  !current_count_sectors){
2250                                 cont->redo();
2251                                 return;
2252                         }
2253                         current_type[current_drive] = floppy;
2254                         floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
2255                         break;
2256         }
2257 
2258         if (probing) {
2259                 if (DP->flags & FTD_MSG)
2260                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2261                                 floppy->name,current_drive);
2262                 current_type[current_drive] = floppy;
2263                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2264                 probing = 0;
2265         }
2266 
2267         if ( CT(COMMAND) != FD_READ || 
2268              raw_cmd->kernel_data == CURRENT->buffer ){
2269                 /* transfer directly from buffer */
2270                 cont->done(1);
2271         } else if ( CT(COMMAND) == FD_READ){
2272                 buffer_track = raw_cmd->track;
2273                 buffer_drive = current_drive;
2274                 if ( nr_sectors + sector_t > buffer_max )
2275                         buffer_max = nr_sectors + sector_t;
2276         }
2277         cont->redo();
2278 }
2279 
2280 /* Compute maximal contiguous buffer size. */
2281 static int buffer_chain_size(void)
     /*  */
2282 {
2283         struct buffer_head *bh;
2284         int size;
2285         char *base;
2286 
2287         base = CURRENT->buffer;
2288         size = CURRENT->current_nr_sectors << 9;
2289         bh = CURRENT->bh;
2290 
2291         if (bh){
2292                 bh = bh->b_reqnext;
2293                 while ( bh && bh->b_data == base + size ){
2294                         size += bh->b_size;
2295                         bh = bh->b_reqnext;
2296                 }
2297         }
2298         return size >> 9;
2299 }
2300 
2301 /* Compute the maximal transfer size */
2302 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2303 {
2304         if ( max_sector > sector_t + max_size)
2305                 max_sector = sector_t + max_size;
2306 
2307         /* alignment */
2308         max_sector -= (max_sector % floppy->sect ) % ssize;
2309 
2310         /* transfer size, beginning not aligned */
2311         current_count_sectors = max_sector - sector_t ;
2312 
2313         return max_sector;
2314 }
2315 
2316 /*
2317  * Move data from/to the track buffer to/from the buffer cache.
2318  */
2319 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2320 {
2321         int remaining; /* number of transferred 512-byte sectors */
2322         struct buffer_head *bh;
2323         char *buffer, *dma_buffer;
2324         int size;
2325 
2326         if ( max_sector > max_sector_2 )
2327                 max_sector = max_sector_2;
2328 
2329         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2330 
2331         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2332             buffer_max > sector_t + CURRENT->nr_sectors){
2333                 current_count_sectors = buffer_max - sector_t;
2334                 if ( current_count_sectors > CURRENT->nr_sectors )
2335                         current_count_sectors = CURRENT->nr_sectors;
2336         }
2337         remaining = current_count_sectors << 9;
2338 #ifdef FLOPPY_SANITY_CHECK
2339         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2340             CT(COMMAND) == FD_WRITE ){
2341                 DPRINT("in copy buffer\n");
2342                 printk("current_count_sectors=%ld\n", current_count_sectors);
2343                 printk("remaining=%d\n", remaining >> 9);
2344                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2345                 printk("CURRENT->current_nr_sectors=%ld\n",
2346                        CURRENT->current_nr_sectors);
2347                 printk("max_sector=%d\n", max_sector);
2348                 printk("ssize=%d\n", ssize);
2349         }
2350 #endif
2351 
2352         if ( max_sector > buffer_max )
2353                 buffer_max = max_sector;
2354 
2355         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2356 
2357         bh = CURRENT->bh;
2358         size = CURRENT->current_nr_sectors << 9;
2359         buffer = CURRENT->buffer;
2360 
2361         while ( remaining > 0){
2362                 if ( size > remaining )
2363                         size = remaining;
2364 #ifdef FLOPPY_SANITY_CHECK
2365                 if (dma_buffer + size >
2366                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2367                     dma_buffer < floppy_track_buffer ){
2368                         DPRINT1("buffer overrun in copy buffer %d\n",
2369                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2370                         printk("sector_t=%d buffer_min=%d\n",
2371                                sector_t, buffer_min);
2372                         printk("current_count_sectors=%ld\n",
2373                                current_count_sectors);
2374                         if ( CT(COMMAND) == FD_READ )
2375                                 printk("read\n");
2376                         if ( CT(COMMAND) == FD_READ )
2377                                 printk("write\n");
2378                         break;
2379                 }
2380                 if ( ((unsigned long)buffer) % 512 )
2381                         DPRINT1("%p buffer not aligned\n", buffer);
2382 #endif
2383                 if ( CT(COMMAND) == FD_READ ) {
2384                         fd_cacheflush(dma_buffer, size);
2385                         memcpy( buffer, dma_buffer, size);
2386                 }       
2387                 else {
2388                         memcpy( dma_buffer, buffer, size);
2389                         fd_cacheflush(dma_buffer, size);
2390                 }       
2391                 remaining -= size;
2392                 if ( !remaining)
2393                         break;
2394 
2395                 dma_buffer += size;
2396                 bh = bh->b_reqnext;
2397 #ifdef FLOPPY_SANITY_CHECK
2398                 if ( !bh){
2399                         DPRINT("bh=null in copy buffer after copy\n");
2400                         break;
2401                 }
2402 #endif
2403                 size = bh->b_size;
2404                 buffer = bh->b_data;
2405         }
2406 #ifdef FLOPPY_SANITY_CHECK
2407         if ( remaining ){
2408                 if ( remaining > 0 )
2409                         max_sector -= remaining >> 9;
2410                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2411         }
2412 #endif
2413 }
2414 
2415 /*
2416  * Formulate a read/write request.
2417  * this routine decides where to load the data (directly to buffer, or to
2418  * tmp floppy area), how much data to load (the size of the buffer, the whole
2419  * track, or a single sector)
2420  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2421  * allocation on the fly, it should be done here. No other part should need
2422  * modification.
2423  */
2424 
2425 static int make_raw_rw_request(void)
     /*  */
2426 {
2427         int aligned_sector_t;
2428         int max_sector, max_size, tracksize, ssize;
2429 
2430         set_fdc(DRIVE(CURRENT->rq_dev));
2431 
2432         raw_cmd = &default_raw_cmd;
2433         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2434                 FD_RAW_NEED_SEEK;
2435         raw_cmd->cmd_count = NR_RW;
2436         if (CURRENT->cmd == READ){
2437                 raw_cmd->flags |= FD_RAW_READ;
2438                 COMMAND = FM_MODE(floppy,FD_READ);
2439         } else if (CURRENT->cmd == WRITE){
2440                 raw_cmd->flags |= FD_RAW_WRITE;
2441                 COMMAND = FM_MODE(floppy,FD_WRITE);
2442         } else {
2443                 DPRINT("make_raw_rw_request: unknown command\n");
2444                 return 0;
2445         }
2446 
2447         max_sector = floppy->sect * floppy->head;
2448 
2449         TRACK = CURRENT->sector / max_sector;
2450         sector_t = CURRENT->sector % max_sector;
2451         if ( floppy->track && TRACK >= floppy->track )
2452                 return 0;
2453         HEAD = sector_t / floppy->sect;
2454 
2455         if (((floppy->stretch & FD_SWAPSIDES) || TESTF( FD_NEED_TWADDLE)) &&
2456             sector_t < floppy->sect )
2457                 max_sector = floppy->sect;
2458 
2459         /* 2M disks have phantom sectors on the first track */
2460         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2461                 max_sector = 2 * floppy->sect / 3;
2462                 if (sector_t >= max_sector){
2463                         current_count_sectors =  (floppy->sect - sector_t);
2464                         if ( current_count_sectors > CURRENT->nr_sectors )
2465                                 current_count_sectors = CURRENT->nr_sectors;
2466                         return 1;
2467                 }
2468                 SIZECODE = 2;
2469         } else
2470                 SIZECODE = FD_SIZECODE(floppy);
2471         raw_cmd->rate = floppy->rate & 3;
2472         if ((floppy->rate & FD_2M) &&
2473             (TRACK || HEAD ) &&
2474             raw_cmd->rate == 2)
2475                 raw_cmd->rate = 1;
2476 
2477         if ( SIZECODE )
2478                 SIZECODE2 = 0xff;
2479         else
2480                 SIZECODE2 = 0x80;
2481         raw_cmd->track = TRACK << STRETCH(floppy);
2482         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2483         GAP = floppy->gap;
2484         CODE2SIZE;
2485         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2486         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2487         tracksize = floppy->sect - floppy->sect % ssize;
2488         if ( tracksize < floppy->sect ){
2489                 SECT_PER_TRACK ++;
2490                 if (  tracksize <= sector_t % floppy->sect)
2491                         SECTOR--;
2492                 while ( tracksize <= sector_t % floppy->sect){
2493                         while( tracksize + ssize > floppy->sect ){
2494                                 SIZECODE--;
2495                                 ssize >>= 1;
2496                         }
2497                         SECTOR++; SECT_PER_TRACK ++;
2498                         tracksize += ssize;
2499                 }
2500                 max_sector = HEAD * floppy->sect + tracksize;
2501         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2502                 max_sector = floppy->sect;
2503 
2504         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2505         max_size = CURRENT->nr_sectors;
2506         if ((raw_cmd->track == buffer_track) && (current_drive == buffer_drive) &&
2507             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2508                 /* data already in track buffer */
2509                 if (CT(COMMAND) == FD_READ) {
2510                         copy_buffer(1, max_sector, buffer_max);
2511                         return 1;
2512                 }
2513         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2514                 if (CT(COMMAND) == FD_WRITE){
2515                         if(sector_t + CURRENT->nr_sectors > ssize &&
2516                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2517                                 max_size = ssize + ssize;
2518                         else
2519                                 max_size = ssize;
2520                 }
2521                 raw_cmd->flags &= ~FD_RAW_WRITE;
2522                 raw_cmd->flags |= FD_RAW_READ;
2523                 COMMAND = FM_MODE(floppy,FD_READ);
2524         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS ) {
2525                 int direct, indirect;
2526 
2527                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2528                         sector_t;
2529 
2530                 max_size = buffer_chain_size();
2531                 if ( max_size > ( MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9)
2532                         max_size=(MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9;
2533                 /* 64 kb boundaries */
2534                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2535                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2536                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2537                 /*
2538                  * We try to read tracks, but if we get too many errors, we
2539                  * go back to reading just one sector at a time.
2540                  *
2541                  * This means we should be able to read a sector even if there
2542                  * are other bad sectors on this track.
2543                  */
2544                 if (!direct ||
2545                     (indirect * 2 > direct * 3 &&
2546                      *errors < DP->max_errors.read_track &&
2547                      /*!TESTF( FD_NEED_TWADDLE) &&*/
2548                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2549                         max_size = CURRENT->nr_sectors;
2550                 } else {
2551                         raw_cmd->kernel_data = CURRENT->buffer;
2552                         raw_cmd->length = current_count_sectors << 9;
2553                         if (raw_cmd->length == 0){
2554                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2555                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2556                                         indirect, direct, sector_t);
2557                                 return 0;
2558                         }
2559                         return 2;
2560                 }
2561         }
2562 
2563         if ( CT(COMMAND) == FD_READ )
2564                 max_size = max_sector; /* unbounded */
2565 
2566         /* claim buffer track if needed */
2567         if (buffer_track != raw_cmd->track ||  /* bad track */
2568             buffer_drive !=current_drive || /* bad drive */
2569             sector_t > buffer_max ||
2570             sector_t < buffer_min ||
2571             ((CT(COMMAND) == FD_READ ||
2572               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2573              max_sector > 2 * max_buffer_sectors + buffer_min &&
2574              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2575             /* not enough space */ ){
2576                 buffer_track = -1;
2577                 buffer_drive = current_drive;
2578                 buffer_max = buffer_min = aligned_sector_t;
2579         }
2580         raw_cmd->kernel_data = floppy_track_buffer + 
2581                 ((aligned_sector_t-buffer_min )<<9);
2582 
2583         if ( CT(COMMAND) == FD_WRITE ){
2584                 /* copy write buffer to track buffer.
2585                  * if we get here, we know that the write
2586                  * is either aligned or the data already in the buffer
2587                  * (buffer will be overwritten) */
2588 #ifdef FLOPPY_SANITY_CHECK
2589                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2590                         DPRINT("internal error offset !=0 on write\n");
2591 #endif
2592                 buffer_track = raw_cmd->track;
2593                 buffer_drive = current_drive;
2594                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2595         } else
2596                 transfer_size(ssize, max_sector,
2597                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2598 
2599         /* round up current_count_sectors to get dma xfer size */
2600         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2601         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2602         raw_cmd->length <<= 9;
2603 #ifdef FLOPPY_SANITY_CHECK
2604         if ((raw_cmd->length < current_count_sectors << 9) ||
2605             (raw_cmd->kernel_data != CURRENT->buffer &&
2606              CT(COMMAND) == FD_WRITE &&
2607              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2608               aligned_sector_t < buffer_min )) ||
2609             raw_cmd->length % ( 128 << SIZECODE ) ||
2610             raw_cmd->length <= 0 || current_count_sectors <= 0){
2611                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2612                         raw_cmd->length, current_count_sectors);
2613                 if ( raw_cmd->kernel_data != CURRENT->buffer )
2614                         printk("addr=%d, length=%ld\n",
2615                                (int) ((raw_cmd->kernel_data - 
2616                                        floppy_track_buffer ) >> 9),
2617                                current_count_sectors);
2618                 printk("st=%d ast=%d mse=%d msi=%d\n",
2619                        sector_t, aligned_sector_t, max_sector, max_size);
2620                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2621                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2622                        COMMAND, SECTOR, HEAD, TRACK);
2623                 printk("buffer drive=%d\n", buffer_drive);
2624                 printk("buffer track=%d\n", buffer_track);
2625                 printk("buffer_min=%d\n", buffer_min );
2626                 printk("buffer_max=%d\n", buffer_max );
2627                 return 0;
2628         }
2629 
2630         if (raw_cmd->kernel_data != CURRENT->buffer ){
2631                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2632                     current_count_sectors < 0 ||
2633                     raw_cmd->length < 0 ||
2634                     raw_cmd->kernel_data + raw_cmd->length >
2635                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2636                         DPRINT("buffer overrun in schedule dma\n");
2637                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2638                                sector_t, buffer_min,
2639                                raw_cmd->length >> 9 );
2640                         printk("current_count_sectors=%ld\n",
2641                                current_count_sectors);
2642                         if ( CT(COMMAND) == FD_READ )
2643                                 printk("read\n");
2644                         if ( CT(COMMAND) == FD_READ )
2645                                 printk("write\n");
2646                         return 0;
2647                 }
2648         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2649                    current_count_sectors > CURRENT->nr_sectors){
2650                 DPRINT("buffer overrun in direct transfer\n");
2651                 return 0;
2652         } else if ( raw_cmd->length < current_count_sectors << 9 ){
2653                 DPRINT("more sectors than bytes\n");
2654                 printk("bytes=%ld\n", raw_cmd->length >> 9 );
2655                 printk("sectors=%ld\n", current_count_sectors);
2656         }
2657         if (raw_cmd->length == 0){
2658                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2659                 return 0;
2660         }
2661 #endif
2662         return 2;
2663 }
2664 
2665 static void redo_fd_request(void)
     /*  */
2666 {
2667 #define REPEAT {request_done(0); continue; }
2668         kdev_t device;
2669         int tmp;
2670 
2671         lastredo = jiffies;
2672         if (current_drive < N_DRIVE)
2673                 floppy_off(current_drive);
2674 
2675         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2676                 DPRINT("current not active!\n");
2677                 return;
2678         }
2679 
2680         while(1){
2681                 if (!CURRENT) {
2682                         CLEAR_INTR;
2683                         unlock_fdc();
2684                         return;
2685                 }
2686                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2687                         panic(DEVICE_NAME ": request list destroyed");
2688                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2689                         panic(DEVICE_NAME ": block not locked");
2690 
2691                 device = CURRENT->rq_dev;
2692                 set_fdc(DRIVE(device));
2693                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2694 
2695                 set_floppy(device);
2696                 raw_cmd = & default_raw_cmd;
2697                 raw_cmd->flags = 0;
2698                 if(start_motor(redo_fd_request)) return;
2699                 if(test_bit(current_drive, &fake_change) ||
2700                    TESTF(FD_DISK_CHANGED)){
2701                         DPRINT("disk absent or changed during operation\n");
2702                         REPEAT;
2703                 }
2704                 if (!floppy) { /* Autodetection */
2705                         if (!probing){
2706                                 DRS->probed_format = 0;
2707                                 if ( next_valid_format() ){
2708                                         DPRINT("no autodetectable formats\n");
2709                                         floppy = NULL;
2710                                         REPEAT;
2711                                 }
2712                         }
2713                         probing = 1;
2714                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2715                 } else
2716                         probing = 0;
2717                 errors = & (CURRENT->errors);
2718                 tmp = make_raw_rw_request();
2719                 if ( tmp < 2 ){
2720                         request_done(tmp);
2721                         continue;
2722                 }
2723 
2724                 if (TESTF(FD_NEED_TWADDLE))
2725                         twaddle();
2726                 floppy_tq.routine = (void *)(void *) floppy_start;
2727                 queue_task(&floppy_tq, &tq_timer);
2728 #ifdef DEBUGT
2729                 debugt("queue fd request");
2730 #endif
2731                 return;
2732         }
2733 #undef REPEAT
2734 }
2735 
2736 static struct cont_t rw_cont={
2737         rw_interrupt,
2738         redo_fd_request,
2739         bad_flp_intr,
2740         request_done };
2741 
2742 struct tq_struct request_tq =
2743 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2744 
2745 static void process_fd_request(void)
     /*  */
2746 {
2747         cont = &rw_cont;
2748         queue_task(&request_tq, &tq_timer);
2749 }
2750 
2751 static void do_fd_request(void)
     /*  */
2752 {
2753         if (fdc_busy){
2754                 /* fdc busy, this new request will be treated when the
2755                    current one is done */
2756                 is_alive("do fd request, old request running");
2757                 return;
2758         }
2759         /* fdc_busy cannot be set by an interrupt or a bh */
2760         floppy_grab_irq_and_dma();
2761         fdc_busy=1;
2762         reschedule_timeout(MAXTIMEOUT, "do fd request",0);
2763         process_fd_request();
2764         is_alive("do fd request");
2765 }
2766 
2767 static struct cont_t poll_cont={
2768         success_and_wakeup,
2769         floppy_ready,
2770         generic_failure,
2771         generic_done };
2772 
2773 static int poll_drive(int interruptible, int flag)
     /*  */
2774 {
2775         int ret;
2776         /* no auto-sense, just clear dcl */
2777         raw_cmd = &default_raw_cmd;
2778         raw_cmd->flags= flag;
2779         raw_cmd->track=0;
2780         raw_cmd->cmd_count=0;
2781         cont = &poll_cont;
2782 #ifdef DCL_DEBUG
2783         if (DP->flags & FD_DEBUG){
2784                 DPRINT("setting NEWCHANGE in poll_drive\n");
2785         }
2786 #endif
2787         SETF(FD_DISK_NEWCHANGE);
2788         WAIT(floppy_ready);
2789         return ret;
2790 }
2791 
2792 /*
2793  * User triggered reset
2794  * ====================
2795  */
2796 
2797 static void reset_intr(void)
     /*  */
2798 {
2799         printk("weird, reset interrupt called\n");
2800 }
2801 
2802 static struct cont_t reset_cont={
2803         reset_intr,
2804         success_and_wakeup,
2805         generic_failure,
2806         generic_done };
2807 
2808 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2809 {
2810         int ret;
2811 
2812         ret=0;
2813         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2814                 return 0;
2815         LOCK_FDC(drive,interruptible);
2816         if(arg == FD_RESET_ALWAYS)
2817                 FDCS->reset=1;
2818         if ( FDCS->reset ){
2819                 cont = &reset_cont;
2820                 reschedule_timeout(CURRENTD, "user reset fdc", 0);
2821                 WAIT(reset_fdc);
2822         }
2823         process_fd_request();
2824         return ret;
2825 }
2826 
2827 /*
2828  * Misc Ioctl's and support
2829  * ========================
2830  */
2831 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2832 {
2833         int i;
2834 
2835         i = verify_area(VERIFY_WRITE,param,size);
2836         if (i)
2837                 return i;
2838         fd_cacheflush(address, size);           /* is this necessary ??? */
2839                         /* Ralf: Yes; only the l2 cache is completly chipset
2840                            controlled */
2841         memcpy_tofs(param,(void *) address, size);
2842         return 0;
2843 }
2844 
2845 static int fd_copyin(void *param, volatile void *address, int size)
     /*  */
2846 {
2847         int i;
2848 
2849         i = verify_area(VERIFY_READ,param,size);
2850         if (i)
2851                 return i;
2852         memcpy_fromfs((void *) address, param, size);
2853         return 0;
2854 }
2855 
2856 #define COPYOUT(x) ECALL(fd_copyout( (void *)param, &(x), sizeof(x)))
2857 #define COPYIN(x) ECALL(fd_copyin( (void *)param, &(x), sizeof(x)))
2858 
2859 static const char *drive_name(int type, int drive )
     /*  */
2860 {
2861         struct floppy_struct *floppy;
2862 
2863         if ( type )
2864                 floppy = floppy_type + type;
2865         else {
2866                 if ( UDP->native_format )
2867                         floppy = floppy_type + UDP->native_format;
2868                 else
2869                         return "(null)";
2870         }
2871         if ( floppy->name )
2872                 return floppy->name;
2873         else
2874                 return "(null)";
2875 }
2876 
2877 
2878 /* raw commands */
2879 static void raw_cmd_done(int flag)
     /*  */
2880 {
2881         int i;
2882 
2883         if(!flag) {
2884                 raw_cmd->flags = FD_RAW_FAILURE;
2885                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2886         } else {
2887                 raw_cmd->reply_count = inr;
2888                 for( i=0; i< raw_cmd->reply_count; i++)
2889                         raw_cmd->reply[i] = reply_buffer[i];
2890 
2891                 if ( raw_cmd->flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2892                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2893                 
2894                 if( (raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2895                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2896                         raw_cmd->flags |= FD_RAW_FAILURE;
2897 
2898                 if( disk_change(current_drive) )
2899                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2900                 else
2901                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2902                 if(raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2903                         motor_off_callback(current_drive);
2904 
2905                 if(raw_cmd->next &&
2906                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2907                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2908                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2909                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2910                         raw_cmd = raw_cmd->next;
2911                         return;
2912                 }
2913         }
2914         generic_done(flag);
2915 }
2916 
2917 
2918 static struct cont_t raw_cmd_cont={
2919         success_and_wakeup,
2920         floppy_start,
2921         generic_failure,
2922         raw_cmd_done
2923 };
2924 
2925 static inline int raw_cmd_copyout(int cmd, char *param,
     /*  */
2926                                   struct floppy_raw_cmd *ptr)
2927 {
2928         struct old_floppy_raw_cmd old_raw_cmd;
2929         int ret;
2930 
2931         while(ptr) {
2932                 if(cmd == OLDFDRAWCMD) {
2933                         old_raw_cmd.flags = ptr->flags;
2934                         old_raw_cmd.data = ptr->data;
2935                         old_raw_cmd.length = ptr->length;
2936                         old_raw_cmd.rate = ptr->rate;
2937                         old_raw_cmd.reply_count = ptr->reply_count;
2938                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2939                         COPYOUT(old_raw_cmd);
2940                         param += sizeof(old_raw_cmd);
2941                 } else {
2942                         COPYOUT(*ptr);
2943                         param += sizeof(struct floppy_raw_cmd);
2944                 }
2945 
2946                 if ( (ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2947                         if(ptr->length>=0 && ptr->length<=ptr->buffer_length)
2948                                 ECALL(fd_copyout(ptr->data, 
2949                                                  ptr->kernel_data, 
2950                                                  ptr->buffer_length - 
2951                                                  ptr->length));
2952                 }
2953                 ptr = ptr->next;
2954         }
2955         return 0;
2956 }
2957 
2958 
2959 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /*  */
2960 {
2961         struct floppy_raw_cmd **next;
2962 
2963         while(*ptr) {
2964                 next = & (*ptr)->next;
2965                 if((*ptr)->buffer_length) {
2966                         free_pages((unsigned long)(*ptr)->kernel_data,
2967                                    __get_order((*ptr)->buffer_length));
2968                         (*ptr)->buffer_length = 0;
2969                 }
2970                 kfree(*ptr);
2971                 *ptr = 0;
2972                 ptr = next;
2973         }
2974 }
2975 
2976 
2977 static inline int raw_cmd_copyin(int cmd, char *param,
     /*  */
2978                                  struct floppy_raw_cmd **rcmd)
2979 {
2980         struct floppy_raw_cmd *ptr;
2981         struct old_floppy_raw_cmd old_raw_cmd;
2982         int ret;
2983         int i;
2984         
2985         *rcmd = 0;
2986         while(1) {
2987                 ptr = (struct floppy_raw_cmd *) 
2988                         kmalloc(sizeof(struct floppy_raw_cmd ), GFP_USER);
2989                 if(!ptr)
2990                         return -ENOMEM;
2991                 ptr->next = 0;
2992                 ptr->buffer_length = 0;
2993                 *rcmd = ptr;
2994                 if(cmd == OLDFDRAWCMD){
2995                         COPYIN(old_raw_cmd);
2996                         ptr->flags = old_raw_cmd.flags;
2997                         ptr->data = old_raw_cmd.data;
2998                         ptr->length = old_raw_cmd.length;
2999                         ptr->rate = old_raw_cmd.rate;
3000                         ptr->cmd_count = old_raw_cmd.cmd_count;
3001                         ptr->track = old_raw_cmd.track;
3002                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
3003                         if(ptr->cmd_count > 9)
3004                                 return -EINVAL;                 
3005                         ptr->next = 0;
3006                         ptr->phys_length = 0;
3007                         param += sizeof(struct old_floppy_raw_cmd);
3008                 } else {
3009                         COPYIN(*ptr);
3010                         param += sizeof(struct floppy_raw_cmd);
3011                         if(ptr->cmd_count > 16)
3012                                 return -EINVAL;
3013                 }
3014 
3015                 for(i=0; i< 16; i++)
3016                         ptr->reply[i] = 0;
3017                 ptr->resultcode = 0;
3018 
3019                 ptr->next = 0;
3020                 ptr->buffer_length = 0;
3021                 ptr->kernel_data = 0;
3022 
3023                 if(ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3024                         if(!ptr->length)
3025                                 return -EINVAL;
3026 
3027                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
3028                         if(!ptr->kernel_data)
3029                                 return -ENOMEM;
3030                         ptr->buffer_length = ptr->length;
3031                 }
3032                 if(ptr->flags & FD_RAW_WRITE)
3033                         fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3034                 rcmd = & (ptr->next);
3035                 if( ! (ptr->flags & FD_RAW_MORE))
3036                         return 0;
3037                 ptr->rate &= 0x03;
3038 
3039         }
3040 }
3041 
3042 
3043 static int raw_cmd_ioctl(int cmd, void *param)
     /*  */
3044 {
3045         int drive, ret, ret2;
3046         struct floppy_raw_cmd *my_raw_cmd;
3047 
3048         if ( FDCS->rawcmd <= 1 )
3049                 FDCS->rawcmd = 1;
3050         for ( drive= 0; drive < N_DRIVE; drive++){
3051                 if ( FDC(drive) != fdc)
3052                         continue;
3053                 if ( drive == current_drive ){
3054                         if ( UDRS->fd_ref > 1 ){
3055                                 FDCS->rawcmd = 2;
3056                                 break;
3057                         }
3058                 } else if ( UDRS->fd_ref ){
3059                         FDCS->rawcmd = 2;
3060                         break;
3061                 }
3062         }
3063 
3064         if(FDCS->reset)
3065                 return -EIO;
3066 
3067         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3068         if(ret) {
3069                 raw_cmd_free(&my_raw_cmd);
3070                 return ret;
3071         }
3072 
3073         raw_cmd = my_raw_cmd;
3074         cont = &raw_cmd_cont;
3075         ret=wait_til_done(floppy_start,1);
3076 #ifdef DCL_DEBUG
3077         if (DP->flags & FD_DEBUG){
3078                 DPRINT("calling disk change from raw_cmd ioctl\n");
3079         }
3080 #endif
3081 
3082         if(ret != -EINTR && FDCS->reset)
3083                 ret = -EINTR;
3084 
3085         DRS->track = NO_TRACK;
3086 
3087         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3088         if(!ret)
3089                 ret = ret2;
3090         raw_cmd_free(&my_raw_cmd);
3091         return ret;
3092 }
3093 
3094 static int invalidate_drive(kdev_t rdev)
     /*  */
3095 {
3096         /* invalidate the buffer track to force a reread */
3097         set_bit( DRIVE(rdev), &fake_change);
3098         process_fd_request();
3099         check_disk_change(rdev);
3100         return 0;
3101 }
3102 
3103 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
3104                     unsigned long param)
3105 {
3106 #define IOCTL_MODE_BIT 8
3107 #define OPEN_WRITE_BIT 16
3108 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3109 
3110         struct floppy_struct newparams;
3111         struct format_descr tmp_format_req;
3112         int i,drive,type,cnt;
3113         kdev_t device;
3114         struct floppy_struct *this_floppy;
3115         const char *name;
3116         int ret;
3117 
3118         device = inode->i_rdev;
3119         switch (cmd) {
3120                 RO_IOCTLS(device,param);
3121         }
3122         type = TYPE(device);
3123         drive = DRIVE(device);
3124         switch (cmd) {
3125                 case OLDFDGETDRVTYP:
3126                 case FDGETDRVTYP:
3127                         i=verify_area(VERIFY_WRITE,(void *) param,16);
3128                         if (i)
3129                                 return i;
3130                         name = drive_name(type,drive);
3131                         for ( cnt=0; cnt<16; cnt++){
3132                                 put_user(name[cnt], ((char*)param)+cnt);
3133                                 if ( ! *name )
3134                                         break;
3135                         }
3136                         return 0;
3137                 case OLDFDGETMAXERRS:
3138                 case FDGETMAXERRS:
3139                         COPYOUT(UDP->max_errors);
3140                         return 0;
3141                 case OLDFDGETPRM:
3142                 case FDGETPRM:
3143                         if (type)
3144                                 this_floppy = &floppy_type[type];
3145                         else if ((this_floppy = current_type[drive]) == NULL)
3146                                 return -ENODEV;
3147                         COPYOUT(this_floppy[0]);
3148                         return 0;
3149                 case OLDFDPOLLDRVSTAT:
3150                 case FDPOLLDRVSTAT:
3151                         LOCK_FDC(drive,1);
3152                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3153                         process_fd_request();
3154                         /* fall through */
3155                 case OLDFDGETDRVSTAT:
3156                 case FDGETDRVSTAT:
3157                         COPYOUT(*UDRS);
3158                         return 0;
3159                 case OLDFDGETFDCSTAT:
3160                         COPYOUT(* (struct old_floppy_fdc_state *) UFDCS);
3161                         return 0;
3162                 case FDGETFDCSTAT:
3163                         COPYOUT(*UFDCS);
3164                         return 0;
3165                 case OLDFDGETDRVPRM:
3166                 case FDGETDRVPRM:
3167                         COPYOUT(*UDP);
3168                         return 0;
3169                 case OLDFDWERRORGET:
3170                 case FDWERRORGET:
3171                         COPYOUT(*UDRWE);
3172                         return 0;
3173         }
3174         if (!IOCTL_ALLOWED)
3175                 return -EPERM;
3176         switch (cmd) {
3177                 case OLDFDWERRORCLR:
3178                 case FDWERRORCLR:
3179                         UDRWE->write_errors = 0;
3180                         UDRWE->first_error_sector = 0;
3181                         UDRWE->first_error_generation = 0;
3182                         UDRWE->last_error_sector = 0;
3183                         UDRWE->last_error_generation = 0;
3184                         UDRWE->badness = 0;
3185                         return 0;
3186                 case OLDFDRAWCMD:
3187                 case FDRAWCMD:
3188                         if (type)
3189                                 return -EINVAL;
3190                         LOCK_FDC(drive,1);
3191                         set_floppy(device);
3192                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3193                         process_fd_request();
3194                         return i;
3195                 case OLDFDFMTTRK:
3196                 case FDFMTTRK:
3197                         if (UDRS->fd_ref != 1)
3198                                 return -EBUSY;
3199                         COPYIN(tmp_format_req);
3200                         return do_format(device, &tmp_format_req);
3201                 case OLDFDSETMAXERRS:
3202                 case FDSETMAXERRS:
3203                         COPYIN(UDP->max_errors);
3204                         return 0;
3205                 case OLDFDFMTBEG:
3206                 case FDFMTBEG:
3207                         return 0;
3208                 case OLDFDCLRPRM:
3209                 case FDCLRPRM:
3210                         LOCK_FDC(drive,1);
3211                         current_type[drive] = NULL;
3212                         floppy_sizes[drive] = MAX_DISK_SIZE;
3213                         UDRS->keep_data = 0;
3214                         return invalidate_drive(device);
3215                 case OLDFDFMTEND:
3216                 case FDFMTEND:
3217                 case OLDFDFLUSH:
3218                 case FDFLUSH:
3219                         LOCK_FDC(drive,1);
3220                         return invalidate_drive(device);
3221                 case OLDFDSETPRM:
3222                 case FDSETPRM:
3223                 case OLDFDDEFPRM:
3224                 case FDDEFPRM:
3225                         COPYIN(newparams);
3226                         /* sanity checking for parameters.*/
3227                         if(newparams.sect <= 0 ||
3228                            newparams.head <= 0 ||
3229                            newparams.track <= 0 ||
3230                            newparams.track > UDP->tracks>> STRETCH(&newparams) ||
3231                            /* check if reserved bits are set */
3232                            (newparams.stretch & ~(FD_STRETCH | FD_SWAPSIDES)) != 0)
3233                                 return -EINVAL;
3234                         if ( type){
3235                                 if ( !suser() )
3236                                         return -EPERM;
3237                                 LOCK_FDC(drive,1);
3238                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3239                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3240                                             drive_state[cnt].fd_ref)
3241                                                 set_bit(drive, &fake_change);
3242                                 }
3243                                 floppy_type[type] = newparams;
3244                                 floppy_type[type].name="user format";
3245                                 for (cnt = type << 2 ;
3246                                      cnt < (type << 2 ) + 4 ;
3247                                      cnt++)
3248                                         floppy_sizes[cnt]=
3249                                                 floppy_sizes[cnt+0x80]=
3250                                                 floppy_type[type].size>>1;
3251                                 process_fd_request();
3252                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3253                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3254                                             drive_state[cnt].fd_ref)
3255                                                 check_disk_change(drive_state[cnt].
3256                                                                   fd_device);
3257                                 }
3258                                 return 0;
3259                         }
3260 
3261                         LOCK_FDC(drive,1);
3262                         if ( cmd != FDDEFPRM )
3263                                 /* notice a disk change immediately, else
3264                                  * we loose our settings immediately*/
3265                                 CALL(poll_drive(1,0));
3266                         user_params[drive] = newparams;
3267                         if (buffer_drive == drive &&
3268                             buffer_max > user_params[drive].sect)
3269                                 buffer_max=user_params[drive].sect;
3270                         current_type[drive] = &user_params[drive];
3271                         floppy_sizes[drive] = user_params[drive].size >> 1;
3272                         if (cmd == FDDEFPRM)
3273                                 DRS->keep_data = -1;
3274                         else
3275                                 DRS->keep_data = 1;
3276                         /* invalidation. Invalidate only when needed, i.e.
3277                          * when there are already sectors in the buffer cache
3278                          * whose number will change. This is useful, because
3279                          * mtools often changes the geometry of the disk after
3280                          * looking at the boot block */
3281                         if (DRS->maxblock >
3282                             user_params[drive].sect ||
3283                             DRS->maxtrack )
3284                                 invalidate_drive(device);
3285                         else
3286                                 process_fd_request();
3287                         return 0;
3288                 case OLDFDRESET:
3289                 case FDRESET:
3290                         return user_reset_fdc( drive, (int)param, 1);
3291                 case OLDFDMSGON:
3292                 case FDMSGON:
3293                         UDP->flags |= FTD_MSG;
3294                         return 0;
3295                 case OLDFDMSGOFF:
3296                 case FDMSGOFF:
3297                         UDP->flags &= ~FTD_MSG;
3298                         return 0;
3299                 case OLDFDSETEMSGTRESH:
3300                 case FDSETEMSGTRESH:
3301                         UDP->max_errors.reporting =
3302                         (unsigned short) (param & 0x0f);
3303                         return 0;
3304                 case OLDFDTWADDLE:
3305                 case FDTWADDLE:
3306                         LOCK_FDC(drive,1);
3307                         twaddle();
3308                         process_fd_request();
3309         }
3310         if ( ! suser() )
3311                 return -EPERM;
3312         switch(cmd){
3313                 case OLDFDSETDRVPRM:
3314                 case FDSETDRVPRM:
3315                         COPYIN(*UDP);
3316                         return 0;
3317                 default:
3318                         return -EINVAL;
3319         }
3320         return 0;
3321 #undef IOCTL_ALLOWED
3322 }
3323 
3324 static void config_types(void)
     /*  */
3325 {
3326         int first=1;
3327         int drive;
3328 
3329         /* read drive info out of physical cmos */
3330         drive=0;
3331         if (!UDP->cmos )
3332                 UDP->cmos= FLOPPY0_TYPE;
3333         drive=1;
3334         if (!UDP->cmos && FLOPPY1_TYPE)
3335                 UDP->cmos = FLOPPY1_TYPE;
3336 
3337         /* XXX */
3338         /* additional physical CMOS drive detection should go here */
3339 
3340         for (drive=0; drive < N_DRIVE; drive++){
3341                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3342                         memcpy((char *) UDP,
3343                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3344                                sizeof(struct floppy_drive_params));
3345                 if (UDP->cmos){
3346                         if (first)
3347                                 printk("Floppy drive(s): ");
3348                         else
3349                                 printk(", ");
3350                         first=0;
3351                         if (UDP->cmos > 0 ){
3352                                 ALLOWED_DRIVE_MASK |= 1 << drive;
3353                                 printk("fd%d is %s", drive,
3354                                        default_drive_params[(int)UDP->cmos].name);
3355                         } else
3356                                 printk("fd%d is unknown type %d",drive,
3357                                        UDP->cmos);
3358                 }
3359         }
3360         if(!first)
3361                 printk("\n");
3362 }
3363 
3364 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
3365                        char * buf, int count)
3366 {
3367         int drive = DRIVE(inode->i_rdev);
3368 
3369         check_disk_change(inode->i_rdev);
3370         if (UTESTF(FD_DISK_CHANGED))
3371                 return -ENXIO;
3372         return block_read(inode, filp, buf, count);
3373 }
3374 
3375 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
3376                         const char * buf, int count)
3377 {
3378         int block;
3379         int ret;
3380         int drive = DRIVE(inode->i_rdev);
3381 
3382         if(!UDRS->maxblock)
3383                 UDRS->maxblock=1;/* make change detectable */
3384         check_disk_change(inode->i_rdev);
3385         if (UTESTF(FD_DISK_CHANGED))
3386                 return -ENXIO;
3387         if(!UTESTF(FD_DISK_WRITABLE))
3388                 return -EROFS;
3389         block = (filp->f_pos + count) >> 9;
3390         if(block > UDRS->maxblock)
3391                 UDRS->maxblock = block;
3392         ret= block_write(inode, filp, buf, count);
3393         return ret;
3394 }
3395 
3396 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
3397 {
3398         int drive;
3399 
3400         drive = DRIVE(inode->i_rdev);
3401 
3402         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3403                 /* if the file is mounted OR (writable now AND writable at
3404                  * open time) Linus: Does this cover all cases? */
3405                 block_fsync(inode,filp);
3406 
3407         if (UDRS->fd_ref < 0)
3408                 UDRS->fd_ref=0;
3409         else if (!UDRS->fd_ref--) {
3410                 DPRINT("floppy_release with fd_ref == 0");
3411                 UDRS->fd_ref = 0;
3412         }
3413         floppy_release_irq_and_dma();
3414 }
3415 
3416 /*
3417  * floppy_open check for aliasing (/dev/fd0 can be the same as
3418  * /dev/PS0 etc), and disallows simultaneous access to the same
3419  * drive with different device numbers.
3420  */
3421 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3422 
3423 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
3424 {
3425         int drive;
3426         int old_dev;
3427         int try;
3428         char *tmp;
3429 
3430         if (!filp) {
3431                 DPRINT("Weird, open called with filp=0\n");
3432                 return -EIO;
3433         }
3434 
3435         drive = DRIVE(inode->i_rdev);
3436 
3437         if (drive >= N_DRIVE ||
3438             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3439             fdc_state[FDC(drive)].version == FDC_NONE)
3440                 return -ENXIO;
3441 
3442         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3443                 return -ENXIO;
3444         old_dev = UDRS->fd_device;
3445         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3446                 return -EBUSY;
3447 
3448         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3449                 USETF(FD_DISK_CHANGED);
3450                 USETF(FD_VERIFY);
3451         }
3452 
3453         if(UDRS->fd_ref == -1 ||
3454            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3455                 return -EBUSY;
3456 
3457         if (floppy_grab_irq_and_dma())
3458                 return -EBUSY;
3459 
3460         if (filp->f_flags & O_EXCL)
3461                 UDRS->fd_ref = -1;
3462         else
3463                 UDRS->fd_ref++;
3464 
3465         if (!floppy_track_buffer){
3466                 /* if opening an ED drive, reserve a big buffer,
3467                  * else reserve a small one */
3468                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3469                         try = 64; /* Only 48 actually useful */
3470                 else
3471                         try = 32; /* Only 24 actually useful */
3472 
3473                 tmp=(char *)dma_mem_alloc(1024 * try);
3474                 if (!tmp) {
3475                         try >>= 1; /* buffer only one side */
3476                         if (try < 16)
3477                                 try=16;
3478                         tmp= (char *)dma_mem_alloc(1024*try);
3479                 }
3480                 if (!tmp) {
3481                         DPRINT("Unable to allocate DMA memory\n");
3482                         RETERR(ENXIO);
3483                 }
3484                 if (floppy_track_buffer){
3485                         free_pages((unsigned long)tmp,__get_order(try*1024));
3486                 }else {
3487                         floppy_track_buffer = tmp;
3488                         max_buffer_sectors = try;
3489                 }
3490         }
3491 
3492         UDRS->fd_device = MINOR(inode->i_rdev);
3493 
3494         if (old_dev && old_dev != inode->i_rdev) {
3495                 if (buffer_drive == drive)
3496                         buffer_track = -1;
3497                 invalidate_buffers(old_dev);
3498         }
3499 
3500         /* Allow ioctls if we have write-permissions even if read-only open */
3501         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3502                 filp->f_mode |= IOCTL_MODE_BIT;
3503         if (filp->f_mode & 2)
3504                 filp->f_mode |= OPEN_WRITE_BIT;
3505 
3506         if (UFDCS->rawcmd == 1)
3507                 UFDCS->rawcmd = 2;
3508 
3509         if (filp->f_flags & O_NDELAY)
3510                 return 0;
3511         if (filp->f_mode & 3) {
3512                 UDRS->last_checked = 0;
3513                 check_disk_change(inode->i_rdev);
3514                 if (UTESTF(FD_DISK_CHANGED))
3515                         RETERR(ENXIO);
3516         }
3517         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3518                 RETERR(EROFS);
3519         return 0;
3520 #undef RETERR
3521 }
3522 
3523 /*
3524  * Check if the disk has been changed or if a change has been faked.
3525  */
3526 static int check_floppy_change(kdev_t dev)
     /*  */
3527 {
3528         int drive = DRIVE( dev );
3529 
3530         if (MAJOR(dev) != MAJOR_NR) {
3531                 DPRINT("floppy_changed: not a floppy\n");
3532                 return 0;
3533         }
3534 
3535         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3536                 return 1;
3537 
3538         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3539                 lock_fdc(drive,0);
3540                 poll_drive(0,0);
3541                 process_fd_request();
3542         }
3543 
3544         if(UTESTF(FD_DISK_CHANGED) ||
3545            UTESTF(FD_VERIFY) ||
3546            test_bit(drive, &fake_change) ||
3547            (!TYPE(dev) && !current_type[drive]))
3548                 return 1;
3549         return 0;
3550 }
3551 
3552 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3553  * the bootblock (block 0). "Autodetection" is also needed to check whether
3554  * there is a disk in the drive at all... Thus we also do it for fixed
3555  * geometry formats */
3556 static int floppy_revalidate(kdev_t dev)
     /*  */
3557 {
3558 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3559         struct buffer_head * bh;
3560         int drive=DRIVE(dev);
3561         int cf;
3562 
3563         if(UTESTF(FD_DISK_CHANGED) ||
3564            UTESTF(FD_VERIFY) ||
3565            test_bit(drive, &fake_change) ||
3566            NO_GEOM){
3567                 lock_fdc(drive,0);
3568                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3569                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3570                         process_fd_request(); /*already done by another thread*/
3571                         return 0;
3572                 }
3573                 UDRS->maxblock = 0;
3574                 UDRS->maxtrack = 0;
3575                 if ( buffer_drive == drive)
3576                         buffer_track = -1;
3577                 clear_bit(drive, &fake_change);
3578                 UCLEARF(FD_DISK_CHANGED);
3579                 if(cf)
3580                         UDRS->generation++;
3581                 if(NO_GEOM){
3582                         /* auto-sensing */
3583                         int size = floppy_blocksizes[MINOR(dev)];
3584                         if (!size)
3585                                 size = 1024;
3586                         if (!(bh = getblk(dev,0,size))){
3587                                 process_fd_request();
3588                                 return 1;
3589                         }
3590                         if ( bh && ! bh->b_uptodate)
3591                                 ll_rw_block(READ, 1, &bh);
3592                         process_fd_request();
3593                         wait_on_buffer(bh);
3594                         brelse(bh);
3595                         return 0;
3596                 }
3597                 if(cf)
3598                         poll_drive(0, FD_RAW_NEED_DISK);
3599                 process_fd_request();
3600         }
3601         return 0;
3602 }
3603 
3604 static struct file_operations floppy_fops = {
3605         NULL,                   /* lseek - default */
3606         floppy_read,            /* read - general block-dev read */
3607         floppy_write,           /* write - general block-dev write */
3608         NULL,                   /* readdir - bad */
3609         NULL,                   /* select */
3610         fd_ioctl,               /* ioctl */
3611         NULL,                   /* mmap */
3612         floppy_open,            /* open */
3613         floppy_release,         /* release */
3614         block_fsync,            /* fsync */
3615         NULL,                   /* fasync */
3616         check_floppy_change,    /* media_change */
3617         floppy_revalidate,      /* revalidate */
3618 };
3619 
3620 /*
3621  * Floppy Driver initialisation
3622  * =============================
3623  */
3624 
3625 /* Determine the floppy disk controller type */
3626 /* This routine was written by David C. Niemi */
3627 static char get_fdc_version(void)
     /*  */
3628 {
3629         int r;
3630 
3631         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3632         if ( FDCS->reset )
3633                 return FDC_NONE;
3634         if ( (r = result()) <= 0x00)
3635                 return FDC_NONE;        /* No FDC present ??? */
3636         if ((r==1) && (reply_buffer[0] == 0x80)){
3637                 printk("FDC %d is a 8272A\n",fdc);
3638                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3639         }
3640         if (r != 10) {
3641                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3642                 return FDC_UNKNOWN;
3643         }
3644         output_byte(FD_VERSION);
3645         r = result();
3646         if ((r == 1) && (reply_buffer[0] == 0x80)){
3647                 printk("FDC %d is a 82072\n",fdc);
3648                 return FDC_82072;               /* 82072 doesn't know VERSION */
3649         }
3650         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3651                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3652                 return FDC_UNKNOWN;
3653         }
3654         output_byte(FD_UNLOCK);
3655         r = result();
3656         if ((r == 1) && (reply_buffer[0] == 0x80)){
3657                 printk("FDC %d is a pre-1991 82077\n", fdc);
3658                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3659         }
3660         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3661                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3662                 return FDC_UNKNOWN;
3663         }
3664         printk("FDC %d is a post-1991 82077\n",fdc);
3665         return FDC_82077;       /* Revised 82077AA passes all the tests */
3666 } /* get_fdc_version */
3667 
3668 /* lilo configuration */
3669 
3670 /* we make the invert_dcl function global. One day, somebody might
3671 want to centralize all thinkpad related options into one lilo option,
3672 there are just so many thinkpad related quirks! */
3673 void floppy_invert_dcl(int *ints,int param)
     /*  */
3674 {
3675         int i;
3676 
3677         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3678                 if (param)
3679                         default_drive_params[i].params.flags |= 0x80;
3680                 else
3681                         default_drive_params[i].params.flags &= ~0x80;
3682         }
3683         DPRINT("Configuring drives for inverted dcl\n");
3684 }
3685 
3686 static void daring(int *ints,int param)
     /*  */
3687 {
3688         int i;
3689 
3690         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3691                 if (param){
3692                         default_drive_params[i].params.select_delay = 0;
3693                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3694                 } else {
3695                         default_drive_params[i].params.select_delay = 2*HZ/100;
3696                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3697                 }
3698         }
3699         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3700 }
3701 
3702 static void allow_drives(int *ints, int param)
     /*  */
3703 {
3704         ALLOWED_DRIVE_MASK=param;
3705         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3706 }
3707 
3708 static void fdc2_adr(int *ints, int param)
     /*  */
3709 {
3710         FDC2 = param;
3711         if(param)
3712                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3713         else
3714                 DPRINT("disabling second fdc\n");
3715 }
3716 
3717 static void unex(int *ints,int param)
     /*  */
3718 {
3719         print_unex = param;
3720         DPRINT1("%sprinting messages for unexpected interrupts\n",
3721                 param ? "" : "not ");
3722 }
3723 
3724 static void set_cmos(int *ints, int dummy)
     /*  */
3725 {
3726         int current_drive=0;
3727 
3728         if ( ints[0] != 2 ){
3729                 DPRINT("wrong number of parameter for cmos\n");
3730                 return;
3731         }
3732         current_drive = ints[1];
3733         if (current_drive < 0 || current_drive >= 8 ){
3734                 DPRINT("bad drive for set_cmos\n");
3735                 return;
3736         }
3737         if(current_drive >= 4 && !FDC2)
3738                 fdc2_adr(0, 0x370);
3739         if(ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3740                 DPRINT1("bad cmos code %d\n", ints[2]);
3741                 return;
3742         }
3743         DP->cmos = ints[2];
3744         DPRINT1("setting cmos code to %d\n", ints[2]);
3745 }
3746 
3747 static struct param_table {
3748         const char *name;
3749         void (*fn)(int *ints, int param);
3750         int def_param;
3751 } config_params[]={
3752         { "allowed_drive_mask", allow_drives, 0xff },
3753         { "all_drives", allow_drives, 0xff },
3754         { "asus_pci", allow_drives, 0x33 },
3755 
3756         { "daring", daring, 1},
3757 
3758         { "two_fdc", fdc2_adr, 0x370 },
3759         { "one_fdc", fdc2_adr, 0 },
3760 
3761         { "thinkpad", floppy_invert_dcl, 1 },
3762 
3763         { "cmos", set_cmos, 0 },
3764 
3765         { "unexpected_interrupts", unex, 1 },
3766         { "no_unexpected_interrupts", unex, 0 },
3767         { "L40SX", unex, 0 } };
3768 
3769 #define FLOPPY_SETUP
3770 void floppy_setup(char *str, int *ints)
     /*  */
3771 {
3772         int i;
3773         int param;
3774         if(str)
3775                 for(i=0; i< ARRAY_SIZE(config_params); i++){
3776                         if (strcmp(str,config_params[i].name) == 0 ){
3777                                 if (ints[0] )
3778                                         param = ints[1];
3779                                 else
3780                                         param = config_params[i].def_param;
3781                                 config_params[i].fn(ints,param);
3782                                 return;
3783                         }
3784                 }
3785         if(str) {
3786                 DPRINT1("unknown floppy option [%s]\n", str);
3787                 
3788                 DPRINT("allowed options are:");
3789                 for(i=0; i< ARRAY_SIZE(config_params); i++)
3790                         printk(" %s",config_params[i].name);
3791                 printk("\n");
3792         } else
3793                 DPRINT("botched floppy option\n");
3794         DPRINT("Read linux/drivers/block/README.fd\n");
3795 }
3796 
3797 int floppy_init(void)
     /*  */
3798 {
3799         int i,unit,drive;
3800         int have_no_fdc=0;
3801 
3802         raw_cmd = 0;
3803 
3804         sti();
3805 
3806         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3807                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3808                 return -EBUSY;
3809         }
3810 
3811         for(i=0; i<256; i++)
3812                 if (TYPE(i))
3813                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3814                 else
3815                         floppy_sizes[i] = MAX_DISK_SIZE;
3816 
3817         blk_size[MAJOR_NR] = floppy_sizes;
3818         blksize_size[MAJOR_NR] = floppy_blocksizes;
3819         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3820         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3821         config_types();
3822 
3823         fdc_state[0].address = FDC1;
3824         fdc_state[0].dor = 0;
3825 #if N_FDC > 1
3826         fdc_state[1].address = FDC2;
3827         fdc_state[1].dor = 0;
3828 #endif
3829 
3830         for (i = 0 ; i < N_FDC ; i++) {
3831                 fdc = i;
3832                 FDCS->dtr = -1;
3833                 FDCS->dor = 0x4;
3834                 FDCS->reset = 0;
3835                 FDCS->version = FDC_NONE;
3836         }
3837 
3838         if(floppy_grab_irq_and_dma()){
3839                 unregister_blkdev(MAJOR_NR,"fd");
3840                 return -EBUSY;
3841         }
3842 
3843         /* initialise drive state */
3844         for (drive = 0; drive < N_DRIVE ; drive++) {
3845                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3846                 UDRS->generation = 0;
3847                 UDRS->keep_data = 0;
3848                 UDRS->fd_ref = 0;
3849                 UDRS->fd_device = 0;
3850                 floppy_track_buffer = NULL;
3851                 max_buffer_sectors = 0;
3852                 UDRWE->write_errors = 0;
3853                 UDRWE->first_error_sector = 0;
3854                 UDRWE->first_error_generation = 0;
3855                 UDRWE->last_error_sector = 0;
3856                 UDRWE->last_error_generation = 0;
3857                 UDRWE->badness = 0;
3858         }
3859 
3860         for (i = 0 ; i < N_FDC ; i++) {
3861                 fdc = i;
3862                 FDCS->driver_version = FD_DRIVER_VERSION;
3863                 for(unit=0; unit<4; unit++)
3864                         FDCS->track[unit] = 0;
3865                 if (FDCS->address == -1 )
3866                         continue;
3867                 FDCS->rawcmd = 2;
3868                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3869                         FDCS->address = -1;
3870                         continue;
3871                 }
3872                 /* Try to determine the floppy controller type */
3873                 FDCS->version = get_fdc_version();
3874                 if (FDCS->version == FDC_NONE){
3875                         FDCS->address = -1;
3876                         continue;
3877                 }
3878 
3879                 request_region(FDCS->address, 6, "floppy");
3880                 request_region(FDCS->address+7, 1, "floppy DIR");
3881                 /* address + 6 is reserved, and may be taken by IDE.
3882                  * Unfortunately, Adaptec doesn't know this :-(, */
3883 
3884                 have_no_fdc = 0;
3885                 /* Not all FDCs seem to be able to handle the version command
3886                  * properly, so force a reset for the standard FDC clones,
3887                  * to avoid interrupt garbage.
3888                  */
3889                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3890                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3891         }
3892         fdc=0;
3893         del_timer(&fd_timeout);
3894         current_drive = 0;
3895         floppy_release_irq_and_dma();
3896         initialising=0;
3897         if(have_no_fdc)
3898                 unregister_blkdev(MAJOR_NR,"fd");
3899         else
3900                 virtual_dma_init();
3901         return have_no_fdc;
3902 }
3903 
3904 static int floppy_grab_irq_and_dma(void)
     /*  */
3905 {
3906         int i;
3907         cli();
3908         if (usage_count++){
3909                 sti();
3910                 return 0;
3911         }
3912         sti();
3913 #ifdef FD_MODULE
3914         MOD_INC_USE_COUNT;
3915 #endif
3916         for(i=0; i< N_FDC; i++){
3917                 if(FDCS->address != -1){
3918                         fdc = i;
3919                         reset_fdc_info(1);
3920                         fd_outb(FDCS->dor, FD_DOR);
3921                 }
3922         }
3923         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3924 
3925         if (fd_request_irq()) {
3926                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3927                         FLOPPY_IRQ);
3928                 return -1;
3929         }
3930         if (fd_request_dma()) {
3931                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3932                         FLOPPY_DMA);
3933                 fd_free_irq();
3934                 return -1;
3935         }
3936         for(fdc = 0; fdc < N_FDC ; fdc++)
3937                 if(FDCS->address != -1)
3938                         fd_outb(FDCS->dor, FD_DOR);
3939         fdc = 0;
3940         fd_enable_irq();
3941         return 0;
3942 }
3943 
3944 static void floppy_release_irq_and_dma(void)
     /*  */
3945 {
3946 #ifdef FLOPPY_SANITY_CHECK
3947         int drive;
3948 #endif
3949         long tmpsize;
3950         void *tmpaddr;
3951 
3952         cli();
3953         if (--usage_count){
3954                 sti();
3955                 return;
3956         }
3957         sti();
3958 #ifdef FD_MODULE
3959         MOD_DEC_USE_COUNT;
3960 #endif
3961         fd_disable_dma();
3962         fd_free_dma();
3963         fd_disable_irq();
3964         fd_free_irq();
3965 
3966         set_dor(0, ~0, 8);
3967 #if N_FDC > 1
3968         set_dor(1, ~8, 0);
3969 #endif
3970         floppy_enable_hlt();
3971 
3972         if (floppy_track_buffer && max_buffer_sectors) {
3973                 tmpsize = max_buffer_sectors*1024;
3974                 tmpaddr = (void *)floppy_track_buffer;
3975                 floppy_track_buffer = 0;
3976                 max_buffer_sectors = 0;
3977                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
3978         }
3979 
3980 #ifdef FLOPPY_SANITY_CHECK
3981         for(drive=0; drive < N_FDC * 4; drive++)
3982                 if( motor_off_timer[drive].next )
3983                         printk("motor off timer %d still active\n", drive);
3984 
3985         if(fd_timeout.next)
3986                 printk("floppy timer still active:%s\n", timeout_message);
3987         if (fd_timer.next)
3988                 printk("auxiliary floppy timer still active\n");
3989         if(floppy_tq.sync)
3990                 printk("task queue still active\n");
3991 #endif
3992 }
3993 
3994 
3995 #ifdef MODULE
3996 
3997 extern char *get_options(char *str, int *ints);
3998 
3999 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /*  */
4000 {
4001         int i;
4002         char c;
4003         int j;
4004         int match;
4005         char buffer[100];
4006         int ints[11];
4007         int length = strlen(pattern)+1;
4008 
4009         match=0;
4010         j=1;
4011 
4012         for(i=current->mm->env_start; i< current->mm->env_end; i ++){
4013                 c= get_fs_byte(i);
4014                 if(match){
4015                         if(j==99)
4016                                 c='\0';
4017                         buffer[j] = c;
4018                         if(!c || c == ' ' || c == '\t'){
4019                                 if(j){
4020                                         buffer[j] = '\0';
4021                                         setup(get_options(buffer,ints),ints);
4022                                 }
4023                                 j=0;
4024                         } else
4025                                 j++;
4026                         if(!c)
4027                                 break;
4028                         continue;
4029                 }
4030                 if( (!j && !c) || ( j && c == pattern[j-1]))
4031                         j++;
4032                 else
4033                         j=0;
4034                 if(j==length){
4035                         match=1;
4036                         j=0;
4037                 }
4038         }
4039 }
4040 
4041 
4042 #ifdef __cplusplus
4043 extern "C" {
4044 #endif
4045 int init_module(void)
     /*  */
4046 {
4047         int ret;
4048         printk("inserting floppy driver for %s\n", kernel_version);
4049                 
4050         mod_setup("floppy=", floppy_setup);
4051                 
4052         ret = floppy_init();
4053                 return 0;
4054 }
4055 
4056 void cleanup_module(void)
     /*  */
4057 {
4058         int fdc;
4059                 
4060         for(fdc=0; fdc<2; fdc++)
4061                 if (FDCS->address != -1){
4062                         release_region(FDCS->address, 6);
4063                         release_region(FDCS->address+7, 1);
4064         }
4065                 
4066         unregister_blkdev(MAJOR_NR, "fd");
4067 
4068         blk_dev[MAJOR_NR].request_fn = 0;
4069 }
4070 
4071 #ifdef __cplusplus
4072 }
4073 #endif
4074 
4075 #endif
/* */
root/drivers/block/floppy.c

DEFINITIONS
