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 CONFIG_FLOPPY_SANITY
 100 #undef  CONFIG_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 #include <linux/config.h>
 108 
 109 /* do print messages for unexpected interrupts */
 110 static int print_unex=1;
 111 
 112 #ifdef MODULE
 113 #define FD_MODULE
 114 
 115 #include <linux/module.h>
 116 /*
 117  * NB. we must include the kernel identification string to install the module.
 118  */
 119 #include <linux/version.h>
 120 char kernel_version[] = UTS_RELEASE;
 121 
 122 int FLOPPY_IRQ=6;
 123 int FLOPPY_DMA=2;
 124 int ALLOWED_DRIVE_MASK = 0x33;
 125 
 126 #endif
 127 
 128 #ifndef FD_MODULE
 129 /* the following is the mask of allowed drives. By default units 2 and
 130  * 3 of both floppy controllers are disabled, because switching on the
 131  * motor of these drives causes system hangs on some PCI computers. drive
 132  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 133  * a drive is allowed. */
 134 static int ALLOWED_DRIVE_MASK=0x33;
 135 
 136 #define FLOPPY_IRQ 6
 137 #define FLOPPY_DMA 2
 138 #endif
 139 
 140 #define MODULE_AWARE_DRIVER
 141 
 142 #include <linux/sched.h>
 143 #include <linux/fs.h>
 144 #include <linux/kernel.h>
 145 #include <linux/timer.h>
 146 #include <linux/tqueue.h>
 147 #define FDPATCHES
 148 #include <linux/fdreg.h>
 149 
 150 /* ============================================ *
 151  * old fd.h                                     *
 152  * =========================================== */
 153 
 154 #define OLDFDCLRPRM 0 /* clear user-defined parameters */
 155 #define OLDFDSETPRM 1 /* set user-defined parameters for current media */
 156 #define OLDFDSETMEDIAPRM 1
 157 #define OLDFDDEFPRM 2 /* set user-defined parameters until explicitly cleared */
 158 #define OLDFDDEFMEDIAPRM 2
 159 #define OLDFDGETPRM 3 /* get disk parameters */
 160 #define OLDFDGETMEDIAPRM 3
 161 #define OLDFDMSGON  4 /* issue kernel messages on media type change */
 162 #define OLDFDMSGOFF 5 /* don't issue kernel messages on media type change */
 163 #define OLDFDFMTBEG 6 /* begin formatting a disk */
 164 #define OLDFDFMTTRK 7 /* format the specified track */
 165 #define OLDFDFMTEND 8 /* end formatting a disk */
 166 #define OLDFDSETEMSGTRESH       10      /* set fdc error reporting threshold */
 167 #define OLDFDFLUSH  11 /* flush buffers for media; either for verifying media, or for
 168                        handling a media change without closing the file
 169                        descriptor */
 170 #define OLDFDSETMAXERRS 12 /* set abortion and read_track threshold */
 171 #define OLDFDGETMAXERRS 14 /* get abortion and read_track threshold */
 172 #define OLDFDGETDRVTYP 16          /* get drive type: 5 1/4 or 3 1/2 */
 173 
 174 #define OLDFDSETDRVPRM 20 /* set drive parameters */
 175 #define OLDFDGETDRVPRM 21 /* get drive parameters */
 176 #define OLDFDGETDRVSTAT 22 /* get drive state */
 177 #define OLDFDPOLLDRVSTAT 23 /* get drive state */
 178 #define OLDFDRESET 24 /* reset FDC */
 179 
 180 #define OLDFD_RESET_IF_NEEDED 0
 181 #define OLDFD_RESET_IF_RAWCMD 1
 182 #define OLDFD_RESET_ALWAYS 2
 183 
 184 #define OLDFDGETFDCSTAT 25 /* get fdc state */
 185 #define OLDFDWERRORCLR  27 /* clear write error and badness information */
 186 #define OLDFDWERRORGET  28 /* get write error and badness information */
 187 
 188 #define OLDFDRAWCMD 30 /* send a raw command to the fdc */
 189 
 190 #define OLDFDTWADDLE 40 /* flicker motor-on bit before reading a sector */
 191 
 192 struct old_floppy_raw_cmd {
 193   void *data;
 194   long length;
 195 
 196   unsigned char rate;
 197   unsigned char flags;
 198   unsigned char cmd_count;
 199   unsigned char cmd[9];
 200   unsigned char reply_count;
 201   unsigned char reply[7];
 202   int track;
 203 };
 204 
 205 struct old_floppy_fdc_state {   
 206         int spec1; /* spec1 value last used */
 207         int spec2; /* spec2 value last used */
 208         int dtr;
 209         unsigned char version;  /* FDC version code */
 210         unsigned char dor;
 211         int address; /* io address */
 212         unsigned int rawcmd:2;
 213         unsigned int reset:1;
 214         unsigned int need_configure:1;
 215         unsigned int perp_mode:2;
 216         unsigned int has_fifo:1;
 217 };
 218 
 219 
 220 #include <linux/fd.h>
 221 #include <linux/errno.h>
 222 #include <linux/malloc.h>
 223 #include <linux/mm.h>
 224 #include <linux/string.h>
 225 #include <linux/fcntl.h>
 226 #include <linux/delay.h>
 227 #include <linux/mc146818rtc.h> /* CMOS defines */
 228 #include <linux/ioport.h>
 229 
 230 #include <asm/dma.h>
 231 #include <asm/floppy.h>
 232 #include <asm/irq.h>
 233 #include <asm/system.h>
 234 #include <asm/io.h>
 235 #include <asm/segment.h>
 236 
 237 #define MAJOR_NR FLOPPY_MAJOR
 238 #include <linux/blk.h>
 239 
 240 
 241 /*
 242  * Dma Memory related stuff
 243  */
 244 /* Pure 2^n version of get_order */
 245 static inline int __get_order (int size)
     /*  */
 246 {
 247         int order;
 248 
 249 #ifdef  _ASM_IO_H2
 250         __asm__ __volatile__("bsr %1,%0"
 251                              : "=r" (order)
 252                              : "r" (size / PAGE_SIZE) );
 253 #else
 254         for (order = 0; order < NR_MEM_LISTS; ++order)
 255                 if (size <= (PAGE_SIZE << order))
 256                         return order;
 257 #endif
 258         return NR_MEM_LISTS;
 259 }
 260 
 261 static unsigned long dma_mem_alloc(int size)
     /*  */
 262 {
 263         int order = __get_order(size);
 264 
 265         if (order >= NR_MEM_LISTS)
 266                 return(0);
 267         return __get_dma_pages(GFP_KERNEL,order);
 268 }
 269 
 270 static unsigned int fake_change = 0;
 271 static int initialising=1;
 272 
 273 static inline int TYPE(kdev_t x) {
     /*  */
 274         return  (MINOR(x)>>2) & 0x1f;
 275 }
 276 static inline int DRIVE(kdev_t x) {
     /*  */
 277         return (MINOR(x)&0x03) | ((MINOR(x)&0x80 ) >> 5);
 278 }
 279 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 280 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 281 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 282 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 283                                 /* reverse mapping from unit and fdc to drive */
 284 #define DP (&drive_params[current_drive])
 285 #define DRS (&drive_state[current_drive])
 286 #define DRWE (&write_errors[current_drive])
 287 #define FDCS (&fdc_state[fdc])
 288 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 289 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 290 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 291 
 292 #define UDP (&drive_params[drive])
 293 #define UDRS (&drive_state[drive])
 294 #define UDRWE (&write_errors[drive])
 295 #define UFDCS (&fdc_state[FDC(drive)])
 296 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 297 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 298 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 299 
 300 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 301 
 302 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 303 
 304 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 305 
 306 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 307 
 308 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 309 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 310 
 311 /* read/write */
 312 #define COMMAND raw_cmd->cmd[0]
 313 #define DR_SELECT raw_cmd->cmd[1]
 314 #define TRACK raw_cmd->cmd[2]
 315 #define HEAD raw_cmd->cmd[3]
 316 #define SECTOR raw_cmd->cmd[4]
 317 #define SIZECODE raw_cmd->cmd[5]
 318 #define SECT_PER_TRACK raw_cmd->cmd[6]
 319 #define GAP raw_cmd->cmd[7]
 320 #define SIZECODE2 raw_cmd->cmd[8]
 321 #define NR_RW 9
 322 
 323 /* format */
 324 #define F_SIZECODE raw_cmd->cmd[2]
 325 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 326 #define F_GAP raw_cmd->cmd[4]
 327 #define F_FILL raw_cmd->cmd[5]
 328 #define NR_F 6
 329 
 330 /*
 331  * Maximum disk size (in kilobytes). This default is used whenever the
 332  * current disk size is unknown.
 333  * [Now it is rather a minimum]
 334  */
 335 #define MAX_DISK_SIZE 2 /* 3984*/
 336 
 337 #define K_64    0x10000         /* 64KB */
 338 
 339 /*
 340  * globals used by 'result()'
 341  */
 342 #define MAX_REPLIES 10
 343 static unsigned char reply_buffer[MAX_REPLIES];
 344 static int inr; /* size of reply buffer, when called from interrupt */
 345 #define ST0 (reply_buffer[0])
 346 #define ST1 (reply_buffer[1])
 347 #define ST2 (reply_buffer[2])
 348 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 349 #define R_TRACK (reply_buffer[3])
 350 #define R_HEAD (reply_buffer[4])
 351 #define R_SECTOR (reply_buffer[5])
 352 #define R_SIZECODE (reply_buffer[6])
 353 
 354 #define SEL_DLY (2*HZ/100)
 355 
 356 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 357 /*
 358  * this struct defines the different floppy drive types.
 359  */
 360 static struct {
 361         struct floppy_drive_params params;
 362         const char *name; /* name printed while booting */
 363 } default_drive_params[]= {
 364 /* NOTE: the time values in jiffies should be in msec!
 365  CMOS drive type
 366   |     Maximum data rate supported by drive type
 367   |     |   Head load time, msec
 368   |     |   |   Head unload time, msec (not used)
 369   |     |   |   |     Step rate interval, usec
 370   |     |   |   |     |       Time needed for spinup time (jiffies)
 371   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 372   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 373   |     |   |   |     |       |      |   |     Select delay
 374   |     |   |   |     |       |      |   |     |     RPS
 375   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 376   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 377   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 378   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 379 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 380       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 381 
 382 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 383       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 384 
 385 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 386       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 387 
 388 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 389       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 390 
 391 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 392       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 393 
 394 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 395       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 396 
 397 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 398       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 399 /*    |  --autodetected formats---    |      |      |
 400  *    read_track                      |      |    Name printed when booting
 401  *                                    |     Native format
 402  *                  Frequency of disk change checks */
 403 };
 404 
 405 static struct floppy_drive_params drive_params[N_DRIVE];
 406 static struct floppy_drive_struct drive_state[N_DRIVE];
 407 static struct floppy_write_errors write_errors[N_DRIVE];
 408 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 409 
 410 /*
 411  * This struct defines the different floppy types.
 412  *
 413  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 414  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 415  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 416  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 417  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 418  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 419  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 420  * 'stretch' should probably be renamed to something more general, like
 421  * 'options'.  Other parameters should be self-explanatory (see also
 422  * setfdprm(8)).
 423  */
 424 static struct floppy_struct floppy_type[32] = {
 425         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 426         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 427         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 428         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 429         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 430         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 431         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 432         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 433         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 434         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 435 
 436         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 437         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 438         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 439         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 440         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 441         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 442         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 443         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 444         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 445         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 446 
 447         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 448         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 449         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 450         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 451         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 452         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 453         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 454         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 455         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 456 
 457         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 458         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 459         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 460 };
 461 
 462 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 463 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 464 
 465 /* Auto-detection: Disk type used until the next media change occurs. */
 466 struct floppy_struct *current_type[N_DRIVE] = {
 467         NULL, NULL, NULL, NULL,
 468         NULL, NULL, NULL, NULL
 469 };
 470 
 471 /*
 472  * User-provided type information. current_type points to
 473  * the respective entry of this array.
 474  */
 475 struct floppy_struct user_params[N_DRIVE];
 476 
 477 static int floppy_sizes[256];
 478 static int floppy_blocksizes[256] = { 0, };
 479 
 480 /*
 481  * The driver is trying to determine the correct media format
 482  * while probing is set. rw_interrupt() clears it after a
 483  * successful access.
 484  */
 485 static int probing = 0;
 486 
 487 /* Synchronization of FDC access. */
 488 #define FD_COMMAND_DETECT -2
 489 #define FD_COMMAND_NONE -1
 490 #define FD_COMMAND_ERROR 2
 491 #define FD_COMMAND_OKAY 3
 492 
 493 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 494 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 495 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 496 #define CALL(x) if( (x) == -EINTR) return -EINTR
 497 #define ECALL(x) if((ret = (x))) return ret;
 498 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 499 #define WAIT(x) _WAIT((x),interruptible)
 500 #define IWAIT(x) _WAIT((x),1)
 501 
 502 /* Errors during formatting are counted here. */
 503 static int format_errors;
 504 
 505 /* Format request descriptor. */
 506 static struct format_descr format_req;
 507 
 508 /*
 509  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 510  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 511  * H is head unload time (1=16ms, 2=32ms, etc)
 512  */
 513 
 514 /*
 515  * Track buffer
 516  * Because these are written to by the DMA controller, they must
 517  * not contain a 64k byte boundary crossing, or data will be
 518  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 519  * Note that you must not change the sizes below without updating head.S.
 520  */
 521 char *floppy_track_buffer=0;
 522 int max_buffer_sectors=0;
 523 
 524 int *errors;
 525 typedef void (*done_f)(int);
 526 struct cont_t {
 527         void (*interrupt)(void); /* this is called after the interrupt of the
 528                                   * main command */
 529         void (*redo)(void); /* this is called to retry the operation */
 530         void (*error)(void); /* this is called to tally an error */
 531         done_f done; /* this is called to say if the operation has 
 532                       * succeeded/failed */
 533 } *cont=NULL;
 534 
 535 static void floppy_ready(void);
 536 static void floppy_start(void);
 537 static void process_fd_request(void);
 538 static void recalibrate_floppy(void);
 539 static void floppy_shutdown(void);
 540 
 541 static int floppy_grab_irq_and_dma(void);
 542 static void floppy_release_irq_and_dma(void);
 543 
 544 /*
 545  * The "reset" variable should be tested whenever an interrupt is scheduled,
 546  * after the commands have been sent. This is to ensure that the driver doesn't
 547  * get wedged when the interrupt doesn't come because of a failed command.
 548  * reset doesn't need to be tested before sending commands, because
 549  * output_byte is automatically disabled when reset is set.
 550  */
 551 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 552 static void reset_fdc(void);
 553 
 554 /*
 555  * These are global variables, as that's the easiest way to give
 556  * information to interrupts. They are the data used for the current
 557  * request.
 558  */
 559 #define NO_TRACK -1
 560 #define NEED_1_RECAL -2
 561 #define NEED_2_RECAL -3
 562 
 563 /* */
 564 static int usage_count = 0;
 565 
 566 
 567 /* buffer related variables */
 568 static int buffer_track = -1;
 569 static int buffer_drive = -1;
 570 static int buffer_min = -1;
 571 static int buffer_max = -1;
 572 
 573 /* fdc related variables, should end up in a struct */
 574 static struct floppy_fdc_state fdc_state[N_FDC];
 575 static int fdc; /* current fdc */
 576 
 577 static struct floppy_struct * floppy = floppy_type;
 578 static unsigned char current_drive = 0;
 579 static long current_count_sectors = 0;
 580 static unsigned char sector_t; /* sector in track */
 581 
 582 #ifdef DEBUGT
 583 long unsigned debugtimer;
 584 #endif
 585 
 586 /*
 587  * Debugging
 588  * =========
 589  */
 590 static inline void set_debugt(void)
     /*  */
 591 {
 592 #ifdef DEBUGT
 593         debugtimer = jiffies;
 594 #endif
 595 }
 596 
 597 static inline void debugt(const char *message)
     /*  */
 598 {
 599 #ifdef DEBUGT
 600         if ( DP->flags & DEBUGT )
 601                 printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 602 #endif
 603 }
 604 
 605 typedef void (*timeout_fn)(unsigned long);
 606 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 607                                        (timeout_fn) floppy_shutdown };
 608 
 609 static const char *timeout_message;
 610 
 611 #ifdef CONFIG_FLOPPY_SANITY
 612 static void is_alive(const char *message)
     /*  */
 613 {
 614         /* this routine checks whether the floppy driver is "alive" */
 615         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 616                 DPRINT1("timeout handler died: %s\n",message);
 617         }
 618 }
 619 #endif
 620 
 621 #ifdef CONFIG_FLOPPY_SANITY
 622 
 623 #define OLOGSIZE 20
 624 
 625 void (*lasthandler)(void) = NULL;
 626 int interruptjiffies=0;
 627 int resultjiffies=0;
 628 int resultsize=0;
 629 int lastredo=0;
 630 
 631 static struct output_log {
 632         unsigned char data;
 633         unsigned char status;
 634         unsigned long jiffies;
 635 } output_log[OLOGSIZE];
 636 
 637 static int output_log_pos=0;
 638 #endif
 639 
 640 #define CURRENTD -1
 641 #define MAXTIMEOUT -2
 642 
 643 
 644 
 645 static void reschedule_timeout(int drive, const char *message, int marg)
     /*  */
 646 {
 647         if (drive == CURRENTD )
 648                 drive = current_drive;
 649         del_timer(&fd_timeout);
 650         if (drive < 0 || drive > N_DRIVE) {
 651                 fd_timeout.expires = jiffies + 20*HZ;
 652                 drive=0;
 653         } else
 654                 fd_timeout.expires = jiffies + UDP->timeout;
 655         add_timer(&fd_timeout);
 656         if (UDP->flags & FD_DEBUG){
 657                 DPRINT("reschedule timeout ");
 658                 printk(message, marg);
 659                 printk("\n");
 660         }
 661         timeout_message = message;
 662 }
 663 
 664 /*
 665  * Bottom half floppy driver.
 666  * ==========================
 667  *
 668  * This part of the file contains the code talking directly to the hardware,
 669  * and also the main service loop (seek-configure-spinup-command)
 670  */
 671 
 672 /*
 673  * disk change.
 674  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 675  * and the last_checked date.
 676  *
 677  * last_checked is the date of the last check which showed 'no disk change'
 678  * FD_DISK_CHANGE is set under two conditions:
 679  * 1. The floppy has been changed after some i/o to that floppy already
 680  *    took place.
 681  * 2. No floppy disk is in the drive. This is done in order to ensure that
 682  *    requests are quickly flushed in case there is no disk in the drive. It
 683  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 684  *    the drive.
 685  *
 686  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 687  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 688  *  each seek. If a disk is present, the disk change line should also be
 689  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 690  *  change line is set, this means either that no disk is in the drive, or
 691  *  that it has been removed since the last seek.
 692  *
 693  * This means that we really have a third possibility too:
 694  *  The floppy has been changed after the last seek.
 695  */
 696 
 697 static int disk_change(int drive)
     /*  */
 698 {
 699         int fdc=FDC(drive);
 700 #ifdef CONFIG_FLOPPY_SANITY
 701         if(jiffies < UDP->select_delay + UDRS->select_date)
 702                 DPRINT("WARNING disk change called early\n");
 703         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 704            (FDCS->dor & 3) != UNIT(drive) ||
 705            fdc != FDC(drive)){
 706                 DPRINT("probing disk change on unselected drive\n");
 707                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 708                         FDCS->dor);
 709         }
 710 #endif
 711 
 712 #ifdef DCL_DEBUG
 713         if (UDP->flags & FD_DEBUG){
 714                 DPRINT1("checking disk change line for drive %d\n",drive);
 715                 DPRINT1("jiffies=%ld\n", jiffies);
 716                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 717                 DPRINT1("flags=%x\n",UDRS->flags);
 718         }
 719 #endif
 720         if (UDP->flags & FD_BROKEN_DCL)
 721                 return UTESTF(FD_DISK_CHANGED);
 722         if( (fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 723                 USETF(FD_VERIFY); /* verify write protection */
 724                 if(UDRS->maxblock){
 725                         /* mark it changed */
 726                         USETF(FD_DISK_CHANGED);
 727 
 728                         /* invalidate its geometry */
 729                         if (UDRS->keep_data >= 0) {
 730                                 if ((UDP->flags & FTD_MSG) &&
 731                                     current_type[drive] != NULL)
 732                                         DPRINT("Disk type is undefined after "
 733                                                "disk change\n");
 734                                 current_type[drive] = NULL;
 735                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 736                         }
 737                 }
 738                 /*USETF(FD_DISK_NEWCHANGE);*/
 739                 return 1;
 740         } else {
 741                 UDRS->last_checked=jiffies;
 742                 UCLEARF(FD_DISK_NEWCHANGE);
 743         }
 744         return 0;
 745 }
 746 
 747 static inline int is_selected(int dor, int unit)
     /*  */
 748 {
 749         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 750 }
 751 
 752 static int set_dor(int fdc, char mask, char data)
     /*  */
 753 {
 754         register unsigned char drive, unit, newdor,olddor;
 755 
 756         if(FDCS->address == -1)
 757                 return -1;
 758 
 759         olddor = FDCS->dor;
 760         newdor =  (olddor & mask) | data;
 761         if ( newdor != olddor ){
 762                 unit = olddor & 0x3;
 763                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 764                         drive = REVDRIVE(fdc,unit);
 765 #ifdef DCL_DEBUG
 766                         if (UDP->flags & FD_DEBUG){
 767                                 DPRINT("calling disk change from set_dor\n");
 768                         }
 769 #endif
 770                         disk_change(drive);
 771                 }
 772                 FDCS->dor = newdor;
 773                 fd_outb(newdor, FD_DOR);
 774 
 775                 unit = newdor & 0x3;
 776                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 777                         drive = REVDRIVE(fdc,unit);
 778                         UDRS->select_date = jiffies;
 779                 }
 780         }
 781         if ( newdor & 0xf0 )
 782                 floppy_grab_irq_and_dma();
 783         if( olddor & 0xf0 )
 784                 floppy_release_irq_and_dma();
 785         return olddor;
 786 }
 787 
 788 static void twaddle(void)
     /*  */
 789 {
 790         if (DP->select_delay)
 791                 return;
 792         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 793         fd_outb(FDCS->dor, FD_DOR);
 794         DRS->select_date = jiffies;
 795 }
 796 
 797 /* reset all driver information about the current fdc. This is needed after
 798  * a reset, and after a raw command. */
 799 static void reset_fdc_info(int mode)
     /*  */
 800 {
 801         int drive;
 802 
 803         FDCS->spec1 = FDCS->spec2 = -1;
 804         FDCS->need_configure = 1;
 805         FDCS->perp_mode = 1;
 806         FDCS->rawcmd = 0;
 807         for ( drive = 0; drive < N_DRIVE; drive++)
 808                 if (FDC(drive) == fdc &&
 809                     ( mode || UDRS->track != NEED_1_RECAL))
 810                         UDRS->track = NEED_2_RECAL;
 811 }
 812 
 813 /* selects the fdc and drive, and enables the fdc's input/dma. */
 814 static void set_fdc(int drive)
     /*  */
 815 {
 816         if (drive >= 0 && drive < N_DRIVE){
 817                 fdc = FDC(drive);
 818                 current_drive = drive;
 819         }
 820         set_dor(fdc,~0,8);
 821         set_dor(1-fdc, ~8, 0);
 822         if ( FDCS->rawcmd == 2 )
 823                 reset_fdc_info(1);
 824         if ( fd_inb(FD_STATUS) != STATUS_READY )
 825                 FDCS->reset = 1;
 826 }
 827 
 828 /* locks the driver */
 829 static int lock_fdc(int drive, int interruptible)
     /*  */
 830 {
 831         if(!usage_count){
 832                 printk("trying to lock fdc while usage count=0\n");
 833                 return -1;
 834         }
 835         floppy_grab_irq_and_dma();
 836         cli();
 837         while (fdc_busy && NO_SIGNAL)
 838                 interruptible_sleep_on(&fdc_wait);
 839         if(fdc_busy){
 840                 sti();
 841                 return -EINTR;
 842         }
 843         fdc_busy = 1;
 844         sti();
 845         command_status = FD_COMMAND_NONE;
 846         set_fdc(drive);
 847         reschedule_timeout(drive, "lock fdc", 0);
 848         return 0;
 849 }
 850 
 851 #define LOCK_FDC(drive,interruptible) \
 852 if(lock_fdc(drive,interruptible)) return -EINTR;
 853 
 854 
 855 /* unlocks the driver */
 856 static inline void unlock_fdc(void)
     /*  */
 857 {
 858         raw_cmd = 0;
 859         if (!fdc_busy)
 860                 DPRINT("FDC access conflict!\n");
 861 
 862         if ( DEVICE_INTR )
 863                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 864                         DEVICE_INTR);
 865         command_status = FD_COMMAND_NONE;
 866         del_timer(&fd_timeout);
 867         cont = NULL;
 868         fdc_busy = 0;
 869         floppy_release_irq_and_dma();
 870         wake_up(&fdc_wait);
 871 }
 872 
 873 /* switches the motor off after a given timeout */
 874 static void motor_off_callback(unsigned long nr)
     /*  */
 875 {
 876         unsigned char mask = ~(0x10 << UNIT(nr));
 877 
 878         set_dor( FDC(nr), mask, 0 );
 879 }
 880 
 881 static struct timer_list motor_off_timer[N_DRIVE] = {
 882         { NULL, NULL, 0, 0, motor_off_callback },
 883         { NULL, NULL, 0, 1, motor_off_callback },
 884         { NULL, NULL, 0, 2, motor_off_callback },
 885         { NULL, NULL, 0, 3, motor_off_callback },
 886         { NULL, NULL, 0, 4, motor_off_callback },
 887         { NULL, NULL, 0, 5, motor_off_callback },
 888         { NULL, NULL, 0, 6, motor_off_callback },
 889         { NULL, NULL, 0, 7, motor_off_callback }
 890 };
 891 
 892 /* schedules motor off */
 893 static void floppy_off(unsigned int drive)
     /*  */
 894 {
 895         unsigned long volatile delta;
 896         register int fdc=FDC(drive);
 897 
 898         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 899                 return;
 900 
 901         del_timer(motor_off_timer+drive);
 902 
 903         /* make spindle stop in a position which minimizes spinup time
 904          * next time */
 905         if (UDP->rps ){
 906                 delta = jiffies - UDRS->first_read_date + HZ -
 907                         UDP->spindown_offset;
 908                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 909                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 910         }
 911         add_timer(motor_off_timer+drive);
 912 }
 913 
 914 /*
 915  * cycle through all N_DRIVE floppy drives, for disk change testing.
 916  * stopping at current drive. This is done before any long operation, to
 917  * be sure to have up to date disk change information.
 918  */
 919 static void scandrives(void)
     /*  */
 920 {
 921         int i, drive, saved_drive;
 922 
 923         if (DP->select_delay)
 924                 return;
 925 
 926         saved_drive = current_drive;
 927         for(i=0; i< N_DRIVE; i++){
 928                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 929                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 930                         continue; /* skip closed drives */
 931                 set_fdc(drive);
 932                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 933                       (0x10 << UNIT(drive))))
 934                         /* switch the motor off again, if it was off to
 935                          * begin with */
 936                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 937         }
 938         set_fdc(saved_drive);
 939 }
 940 
 941 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 942 
 943 /* this function makes sure that the disk stays in the drive during the
 944  * transfer */
 945 static void fd_watchdog(void)
     /*  */
 946 {
 947 #ifdef DCL_DEBUG
 948         if (DP->flags & FD_DEBUG){
 949                 DPRINT("calling disk change from watchdog\n");
 950         }
 951 #endif
 952 
 953         if ( disk_change(current_drive) ){
 954                 DPRINT("disk removed during i/o\n");
 955                 floppy_shutdown();
 956         } else {
 957                 del_timer(&fd_timer);
 958                 fd_timer.function = (timeout_fn) fd_watchdog;
 959                 fd_timer.expires = jiffies + HZ / 10;
 960                 add_timer(&fd_timer);
 961         }
 962 }
 963 
 964 static void main_command_interrupt(void)
     /*  */
 965 {
 966         del_timer(&fd_timer);
 967         cont->interrupt();
 968 }
 969 
 970 /* waits for a delay (spinup or select) to pass */
 971 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 972 {
 973         if ( FDCS->reset ){
 974                 reset_fdc(); /* do the reset during sleep to win time
 975                               * if we don't need to sleep, it's a good
 976                               * occasion anyways */
 977                 return 1;
 978         }
 979 
 980         if ( jiffies < delay ){
 981                 del_timer(&fd_timer);
 982                 fd_timer.function = function;
 983                 fd_timer.expires = delay;
 984                 add_timer(&fd_timer);
 985                 return 1;
 986         }
 987         return 0;
 988 }
 989 
 990 static int hlt_disabled=0;
 991 static void floppy_disable_hlt(void)
     /*  */
 992 {
 993         unsigned long flags;
 994         save_flags(flags);
 995         cli();
 996         if(!hlt_disabled){
 997                 hlt_disabled=1;
 998 #ifdef HAVE_DISABLE_HLT
 999                 disable_hlt();
1000 #endif
1001         }
1002         restore_flags(flags);
1003 }
1004 
1005 static void floppy_enable_hlt(void)
     /*  */
1006 {
1007         unsigned long flags;
1008         save_flags(flags);
1009         cli();
1010         if(hlt_disabled){
1011                 hlt_disabled=0;
1012 #ifdef HAVE_DISABLE_HLT
1013                 enable_hlt();
1014 #endif
1015         }
1016         restore_flags(flags);
1017 }
1018 
1019 
1020 static void setup_DMA(void)
     /*  */
1021 {
1022 #ifdef CONFIG_FLOPPY_SANITY
1023         if (raw_cmd->length == 0){
1024                 int i;
1025 
1026                 printk("zero dma transfer size:");
1027                 for(i=0; i< raw_cmd->cmd_count; i++)
1028                         printk("%x,", raw_cmd->cmd[i]);
1029                 printk("\n");
1030                 cont->done(0);
1031                 FDCS->reset = 1;
1032                 return;
1033         }
1034 #if 0
1035         /* disabled because of new buffer location for raw cmd */
1036         if ((!CURRENT ||
1037              CURRENT->buffer != raw_cmd->kernel_data ||
1038              raw_cmd->length > 512 * CURRENT->nr_sectors) &&
1039             (raw_cmd->kernel_data < floppy_track_buffer ||
1040              raw_cmd->kernel_data + raw_cmd->length >
1041              floppy_track_buffer + 1024 * max_buffer_sectors)){
1042                 printk("bad address. start=%p lg=%lx tb=%p\n",
1043                        raw_cmd->kernel_data, raw_cmd->length, 
1044                        floppy_track_buffer);
1045                 if ( CURRENT ){
1046                         printk("buffer=%p nr=%lx cnr=%lx\n",
1047                                CURRENT->buffer, CURRENT->nr_sectors,
1048                                CURRENT->current_nr_sectors);
1049                 }
1050                 cont->done(0);
1051                 FDCS->reset=1;
1052                 return;
1053         }
1054 #endif
1055         if ((long) raw_cmd->kernel_data % 512 ){
1056                 printk("non aligned address: %p\n", raw_cmd->kernel_data );
1057                 cont->done(0);
1058                 FDCS->reset=1;
1059                 return;
1060         }
1061         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
1062                 printk("DMA crossing 64-K boundary %p-%p\n",
1063                        raw_cmd->kernel_data,
1064                        raw_cmd->kernel_data + raw_cmd->length);
1065                 cont->done(0);
1066                 FDCS->reset=1;
1067                 return;
1068         }
1069 #endif
1070         cli();
1071         fd_disable_dma();
1072         fd_clear_dma_ff();
1073         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1074                          DMA_MODE_READ : DMA_MODE_WRITE);
1075         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1076         fd_set_dma_count(raw_cmd->length);
1077         fd_enable_dma();
1078         sti();
1079         floppy_disable_hlt();
1080 }
1081 
1082 /* sends a command byte to the fdc */
1083 static int output_byte(char byte)
     /*  */
1084 {
1085         int counter;
1086         unsigned char status = 0;
1087         unsigned char rstatus;
1088 
1089         if (FDCS->reset)
1090                 return -1;
1091         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1092                 rstatus = fd_inb(FD_STATUS);
1093                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1094                 if (!(status & STATUS_READY))
1095                         continue;
1096                 if (status == STATUS_READY){
1097                         fd_outb(byte,FD_DATA);
1098 
1099 #ifdef CONFIG_FLOPPY_SANITY
1100                         output_log[output_log_pos].data = byte;
1101                         output_log[output_log_pos].status = rstatus;
1102                         output_log[output_log_pos].jiffies = jiffies;
1103                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1104 #endif
1105                         return 0;
1106                 } else
1107                         break;
1108         }
1109         FDCS->reset = 1;
1110         if ( !initialising )
1111                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1112                         byte, status);
1113         return -1;
1114 }
1115 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
1116 
1117 /* gets the response from the fdc */
1118 static int result(void)
     /*  */
1119 {
1120         int i = 0, counter, status = 0;
1121 
1122         if (FDCS->reset)
1123                 return -1;
1124         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1125                 status = fd_inb(FD_STATUS)&
1126                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1127                 if (!(status & STATUS_READY))
1128                         continue;
1129                 if (status == STATUS_READY){
1130 #ifdef CONFIG_FLOPPY_SANITY
1131                         resultjiffies = jiffies;
1132                         resultsize = i;
1133 #endif
1134                         return i;
1135                 }
1136                 if (status & STATUS_DMA )
1137                         break;
1138                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1139                         if (i >= MAX_REPLIES) {
1140                                 DPRINT("floppy_stat reply overrun\n");
1141                                 break;
1142                         }
1143                         reply_buffer[i++] = fd_inb(FD_DATA);
1144                 }
1145         }
1146         FDCS->reset = 1;
1147         if ( !initialising )
1148                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1149                         status, fdc, i);
1150         return -1;
1151 }
1152 
1153 /* Set perpendicular mode as required, based on data rate, if supported.
1154  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1155  */
1156 static inline void perpendicular_mode(void)
     /*  */
1157 {
1158         unsigned char perp_mode;
1159 
1160         if (!floppy)
1161                 return;
1162         if (floppy->rate & 0x40){
1163                 switch(raw_cmd->rate){
1164                         case 0:
1165                                 perp_mode=2;
1166                                 break;
1167                         case 3:
1168                                 perp_mode=3;
1169                                 break;
1170                         default:
1171                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1172                                 cont->done(0);
1173                                 FDCS->reset = 1; /* convenient way to return to
1174                                                   * redo without to much hassle (deep
1175                                                   * stack et al. */
1176                                 return;
1177                 }
1178         } else
1179                 perp_mode = 0;
1180 
1181         if ( FDCS->perp_mode == perp_mode )
1182                 return;
1183         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1184                 output_byte(FD_PERPENDICULAR);
1185                 output_byte(perp_mode);
1186                 FDCS->perp_mode = perp_mode;
1187         } else if (perp_mode) {
1188                 DPRINT("perpendicular mode not supported by this FDC.\n");
1189         }
1190 } /* perpendicular_mode */
1191 
1192 #define NOMINAL_DTR 500
1193 
1194 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1195  * head load time, and DMA disable flag to values needed by floppy.
1196  *
1197  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1198  * to account for the data rate-based scaling done by the 82072 and 82077
1199  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1200  * 8272a).
1201  *
1202  * Note that changing the data transfer rate has a (probably deleterious)
1203  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1204  * fdc_specify is called again after each data transfer rate
1205  * change.
1206  *
1207  * srt: 1000 to 16000 in microseconds
1208  * hut: 16 to 240 milliseconds
1209  * hlt: 2 to 254 milliseconds
1210  *
1211  * These values are rounded up to the next highest available delay time.
1212  */
1213 static void fdc_specify(void)
     /*  */
1214 {
1215         unsigned char spec1, spec2;
1216         int srt, hlt, hut;
1217         unsigned long dtr = NOMINAL_DTR;
1218         unsigned long scale_dtr = NOMINAL_DTR;
1219         int hlt_max_code = 0x7f;
1220         int hut_max_code = 0xf;
1221 
1222         if (FDCS->need_configure && FDCS->has_fifo) {
1223                 if ( FDCS->reset )
1224                         return;
1225                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1226                 /* TODO: lock this in via LOCK during initialization */
1227                 output_byte(FD_CONFIGURE);
1228                 output_byte(0);
1229                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1230                 output_byte(0);         /* precompensation from track 0 upwards */
1231                 if ( FDCS->reset ){
1232                         FDCS->has_fifo=0;
1233                         return;
1234                 }
1235                 FDCS->need_configure = 0;
1236                 /*DPRINT("FIFO enabled\n");*/
1237         }
1238 
1239         switch (raw_cmd->rate & 0x03) {
1240                 case 3:
1241                         dtr = 1000;
1242                         break;
1243                 case 1:
1244                         dtr = 300;
1245                         break;
1246                 case 2:
1247                         dtr = 250;
1248                         break;
1249         }
1250 
1251         if (FDCS->version >= FDC_82072) {
1252                 scale_dtr = dtr;
1253                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1254                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1255         }
1256 
1257         /* Convert step rate from microseconds to milliseconds and 4 bits */
1258         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1259         if (srt > 0xf)
1260                 srt = 0xf;
1261         else if (srt < 0)
1262                 srt = 0;
1263 
1264         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1265         if (hlt < 0x01)
1266                 hlt = 0x01;
1267         else if (hlt > 0x7f)
1268                 hlt = hlt_max_code;
1269 
1270         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1271         if (hut < 0x1)
1272                 hut = 0x1;
1273         else if (hut > 0xf)
1274                 hut = hut_max_code;
1275 
1276         spec1 = (srt << 4) | hut;
1277         spec2 = (hlt << 1);
1278 
1279         /* If these parameters did not change, just return with success */
1280         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1281                 /* Go ahead and set spec1 and spec2 */
1282                 output_byte(FD_SPECIFY);
1283                 output_byte(FDCS->spec1 = spec1);
1284                 output_byte(FDCS->spec2 = spec2);
1285         }
1286 } /* fdc_specify */
1287 
1288 /* Set the FDC's data transfer rate on behalf of the specified drive.
1289  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1290  * of the specify command (i.e. using the fdc_specify function).
1291  */
1292 static int fdc_dtr(void)
     /*  */
1293 {
1294         /* If data rate not already set to desired value, set it. */
1295         if ( raw_cmd->rate == FDCS->dtr)
1296                 return 0;
1297 
1298         /* Set dtr */
1299         fd_outb(raw_cmd->rate, FD_DCR);
1300 
1301         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1302          * need a stabilization period of several milliseconds to be
1303          * enforced after data rate changes before R/W operations.
1304          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1305          */
1306         FDCS->dtr = raw_cmd->rate;
1307         return(wait_for_completion(jiffies+2*HZ/100,
1308                                    (timeout_fn) floppy_ready));
1309 } /* fdc_dtr */
1310 
1311 static void tell_sector(void)
     /*  */
1312 {
1313         printk(": track %d, head %d, sector %d, size %d",
1314                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1315 } /* tell_sector */
1316 
1317 
1318 /*
1319  * Ok, this error interpreting routine is called after a
1320  * DMA read/write has succeeded
1321  * or failed, so we check the results, and copy any buffers.
1322  * hhb: Added better error reporting.
1323  * ak: Made this into a separate routine.
1324  */
1325 static int interpret_errors(void)
     /*  */
1326 {
1327         char bad;
1328 
1329         if (inr!=7) {
1330                 DPRINT("-- FDC reply error");
1331                 FDCS->reset = 1;
1332                 return 1;
1333         }
1334 
1335         /* check IC to find cause of interrupt */
1336         switch (ST0 & ST0_INTR) {
1337                 case 0x40:      /* error occurred during command execution */
1338                         bad = 1;
1339                         if (ST1 & ST1_WP) {
1340                                 DPRINT("Drive is write protected\n");
1341                                 CLEARF(FD_DISK_WRITABLE);
1342                                 cont->done(0);
1343                                 bad = 2;
1344                         } else if (ST1 & ST1_ND) {
1345                                 SETF(FD_NEED_TWADDLE);
1346                         } else if (ST1 & ST1_OR) {
1347                                 if (DP->flags & FTD_MSG )
1348                                         DPRINT("Over/Underrun - retrying\n");
1349                                 bad = 0;
1350                         }else if(*errors >= DP->max_errors.reporting){
1351                                 DPRINT("");
1352                                 if (ST0 & ST0_ECE) {
1353                                         printk("Recalibrate failed!");
1354                                 } else if (ST2 & ST2_CRC) {
1355                                         printk("data CRC error");
1356                                         tell_sector();
1357                                 } else if (ST1 & ST1_CRC) {
1358                                         printk("CRC error");
1359                                         tell_sector();
1360                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1361                                         if (!probing) {
1362                                                 printk("sector not found");
1363                                                 tell_sector();
1364                                         } else
1365                                                 printk("probe failed...");
1366                                 } else if (ST2 & ST2_WC) {      /* seek error */
1367                                         printk("wrong cylinder");
1368                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1369                                         printk("bad cylinder");
1370                                 } else {
1371                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1372                                         tell_sector();
1373                                 }
1374                                 printk("\n");
1375 
1376                         }
1377                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1378                                 /* wrong cylinder => recal */
1379                                 DRS->track = NEED_2_RECAL;
1380                         return bad;
1381                 case 0x80: /* invalid command given */
1382                         DPRINT("Invalid FDC command given!\n");
1383                         cont->done(0);
1384                         return 2;
1385                 case 0xc0:
1386                         DPRINT("Abnormal termination caused by polling\n");
1387                         cont->error();
1388                         return 2;
1389                 default: /* (0) Normal command termination */
1390                         return 0;
1391         }
1392 }
1393 
1394 /*
1395  * This routine is called when everything should be correctly set up
1396  * for the transfer (ie floppy motor is on, the correct floppy is
1397  * selected, and the head is sitting on the right track).
1398  */
1399 static void setup_rw_floppy(void)
     /*  */
1400 {
1401         int i,ready_date,r, flags,dflags;
1402         timeout_fn function;
1403 
1404         flags = raw_cmd->flags;
1405         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1406                 flags |= FD_RAW_INTR;
1407 
1408         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1409                 ready_date = DRS->spinup_date + DP->spinup;
1410                 /* If spinup will take a long time, rerun scandrives
1411                  * again just before spinup completion. Beware that
1412                  * after scandrives, we must again wait for selection.
1413                  */
1414                 if ( ready_date > jiffies + DP->select_delay){
1415                         ready_date -= DP->select_delay;
1416                         function = (timeout_fn) floppy_start;
1417                 } else
1418                         function = (timeout_fn) setup_rw_floppy;
1419 
1420                 /* wait until the floppy is spinning fast enough */
1421                 if (wait_for_completion(ready_date,function))
1422                         return;
1423         }
1424         dflags = DRS->flags;
1425 
1426         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1427                 setup_DMA();
1428 
1429         if ( flags & FD_RAW_INTR )
1430                 SET_INTR(main_command_interrupt);
1431 
1432         r=0;
1433         for(i=0; i< raw_cmd->cmd_count; i++)
1434                 r|=output_byte( raw_cmd->cmd[i] );
1435 
1436 #ifdef DEBUGT
1437         debugt("rw_command: ");
1438 #endif
1439         if ( r ){
1440                 reset_fdc();
1441                 return;
1442         }
1443 
1444         if ( ! ( flags & FD_RAW_INTR )){
1445                 inr = result();
1446                 cont->interrupt();
1447         } else if ( flags & FD_RAW_NEED_DISK )
1448                 fd_watchdog();
1449 }
1450 
1451 static int blind_seek;
1452 
1453 /*
1454  * This is the routine called after every seek (or recalibrate) interrupt
1455  * from the floppy controller.
1456  */
1457 static void seek_interrupt(void)
     /*  */
1458 {
1459 #ifdef DEBUGT
1460         debugt("seek interrupt:");
1461 #endif
1462         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1463                 DPRINT("seek failed\n");
1464                 DRS->track = NEED_2_RECAL;
1465                 cont->error();
1466                 cont->redo();
1467                 return;
1468         }
1469         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1470 #ifdef DCL_DEBUG
1471                 if (DP->flags & FD_DEBUG){
1472                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1473                         DPRINT1("jiffies=%ld\n", jiffies);
1474                 }
1475 #endif
1476                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1477                 DRS->select_date = jiffies;
1478         }
1479         DRS->track = ST1;
1480         floppy_ready();
1481 }
1482 
1483 static void check_wp(void)
     /*  */
1484 {
1485         if (TESTF(FD_VERIFY)) {
1486                 /* check write protection */
1487                 output_byte( FD_GETSTATUS );
1488                 output_byte( UNIT(current_drive) );
1489                 if ( result() != 1 ){
1490                         FDCS->reset = 1;
1491                         return;
1492                 }
1493                 CLEARF(FD_VERIFY);
1494                 CLEARF(FD_NEED_TWADDLE);
1495 #ifdef DCL_DEBUG
1496                 if (DP->flags & FD_DEBUG){
1497                         DPRINT("checking whether disk is write protected\n");
1498                         DPRINT1("wp=%x\n",ST3 & 0x40);
1499                 }
1500 #endif
1501                 if (!( ST3  & 0x40))
1502                         SETF(FD_DISK_WRITABLE);
1503                 else
1504                         CLEARF(FD_DISK_WRITABLE);
1505         }
1506 }
1507 
1508 static void seek_floppy(void)
     /*  */
1509 {
1510         int track;
1511 
1512         blind_seek=0;
1513 
1514 #ifdef DCL_DEBUG
1515         if (DP->flags & FD_DEBUG){
1516                 DPRINT("calling disk change from seek\n");
1517         }
1518 #endif
1519 
1520         if (!TESTF(FD_DISK_NEWCHANGE) &&
1521             disk_change(current_drive) &&
1522             (raw_cmd->flags & FD_RAW_NEED_DISK)){
1523                 /* the media changed flag should be cleared after the seek.
1524                  * If it isn't, this means that there is really no disk in
1525                  * the drive.
1526                  */
1527                 SETF(FD_DISK_CHANGED);
1528                 cont->done(0);
1529                 cont->redo();
1530                 return;
1531         }
1532         if ( DRS->track <= NEED_1_RECAL ){
1533                 recalibrate_floppy();
1534                 return;
1535         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1536                    (raw_cmd->flags & FD_RAW_NEED_DISK) &&
1537                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd->track)) {
1538                 /* we seek to clear the media-changed condition. Does anybody
1539                  * know a more elegant way, which works on all drives? */
1540                 if ( raw_cmd->track )
1541                         track = raw_cmd->track - 1;
1542                 else {
1543                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1544                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1545                                 blind_seek = 1;
1546                                 raw_cmd->flags |= FD_RAW_NEED_SEEK;
1547                         }
1548                         track = 1;
1549                 }
1550         } else {
1551                 check_wp();
1552                 if (raw_cmd->track != DRS->track &&
1553                     (raw_cmd->flags & FD_RAW_NEED_SEEK))
1554                         track = raw_cmd->track;
1555                 else {
1556                         setup_rw_floppy();
1557                         return;
1558                 }
1559         }
1560 
1561         SET_INTR(seek_interrupt);
1562         output_byte(FD_SEEK);
1563         output_byte(UNIT(current_drive));
1564         LAST_OUT(track);
1565 #ifdef DEBUGT
1566         debugt("seek command:");
1567 #endif
1568 }
1569 
1570 static void recal_interrupt(void)
     /*  */
1571 {
1572 #ifdef DEBUGT
1573         debugt("recal interrupt:");
1574 #endif
1575         if (inr !=2 )
1576                 FDCS->reset = 1;
1577         else if (ST0 & ST0_ECE) {
1578                 switch(DRS->track){
1579                         case NEED_1_RECAL:
1580 #ifdef DEBUGT
1581                                 debugt("recal interrupt need 1 recal:");
1582 #endif
1583                                 /* after a second recalibrate, we still haven't
1584                                  * reached track 0. Probably no drive. Raise an
1585                                  * error, as failing immediately might upset
1586                                  * computers possessed by the Devil :-) */
1587                                 cont->error();
1588                                 cont->redo();
1589                                 return;
1590                         case NEED_2_RECAL:
1591 #ifdef DEBUGT
1592                                 debugt("recal interrupt need 2 recal:");
1593 #endif
1594                                 /* If we already did a recalibrate,
1595                                  * and we are not at track 0, this
1596                                  * means we have moved. (The only way
1597                                  * not to move at recalibration is to
1598                                  * be already at track 0.) Clear the
1599                                  * new change flag */
1600 #ifdef DCL_DEBUG
1601                                 if (DP->flags & FD_DEBUG){
1602                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1603                                 }
1604 #endif
1605 
1606                                 CLEARF(FD_DISK_NEWCHANGE);
1607                                 DRS->select_date = jiffies;
1608                                 /* fall through */
1609                         default:
1610 #ifdef DEBUGT
1611                                 debugt("recal interrupt default:");
1612 #endif
1613                                 /* Recalibrate moves the head by at
1614                                  * most 80 steps. If after one
1615                                  * recalibrate we don't have reached
1616                                  * track 0, this might mean that we
1617                                  * started beyond track 80.  Try
1618                                  * again.  */
1619                                 DRS->track = NEED_1_RECAL;
1620                                 break;
1621                 }
1622         } else
1623                 DRS->track = ST1;
1624         floppy_ready();
1625 }
1626 
1627 /*
1628  * Unexpected interrupt - Print as much debugging info as we can...
1629  * All bets are off...
1630  */
1631 static void unexpected_floppy_interrupt(void)
     /*  */
1632 {
1633         int i;
1634         if ( initialising )
1635                 return;
1636         if(print_unex){
1637                 DPRINT("unexpected interrupt\n");
1638                 if ( inr >= 0 )
1639                         for(i=0; i<inr; i++)
1640                                 printk("%d %x\n", i, reply_buffer[i] );
1641         }
1642         while(1){
1643                 output_byte(FD_SENSEI);
1644                 inr=result();
1645                 if ( inr != 2 )
1646                         break;
1647                 if(print_unex){
1648                         printk("sensei\n");
1649                         for(i=0; i<inr; i++)
1650                                 printk("%d %x\n", i, reply_buffer[i] );
1651                 }
1652         }
1653         FDCS->reset = 1;
1654 }
1655 
1656 struct tq_struct floppy_tq =
1657 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1658 
1659 /* interrupt handler */
1660 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /*  */
1661 {
1662         void (*handler)(void) = DEVICE_INTR;
1663 
1664         lasthandler = handler;
1665         interruptjiffies = jiffies;
1666 
1667         floppy_enable_hlt();
1668         CLEAR_INTR;
1669         if ( fdc >= N_FDC || FDCS->address == -1){
1670                 /* we don't even know which FDC is the culprit */
1671                 printk("DOR0=%x\n", fdc_state[0].dor);
1672                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1673                 printk("handler=%p\n", handler);
1674                 is_alive("bizarre fdc");
1675                 return;
1676         }
1677         inr = result();
1678         if (!handler){
1679                 unexpected_floppy_interrupt();
1680                 is_alive("unexpected");
1681                 return;
1682         }
1683         if ( inr == 0 ){
1684                 do {
1685                         output_byte(FD_SENSEI);
1686                         inr = result();
1687                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1688         }
1689         floppy_tq.routine = (void *)(void *) handler;
1690         queue_task_irq(&floppy_tq, &tq_timer);
1691         is_alive("normal interrupt end");
1692 }
1693 
1694 static void recalibrate_floppy(void)
     /*  */
1695 {
1696 #ifdef DEBUGT
1697         debugt("recalibrate floppy:");
1698 #endif
1699         SET_INTR(recal_interrupt);
1700         output_byte(FD_RECALIBRATE);
1701         LAST_OUT(UNIT(current_drive));
1702 }
1703 
1704 /*
1705  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1706  */
1707 static void reset_interrupt(void)
     /*  */
1708 {
1709 #ifdef DEBUGT
1710         debugt("reset interrupt:");
1711 #endif
1712         /* fdc_specify();          reprogram fdc */
1713         result();               /* get the status ready for set_fdc */
1714         if ( FDCS->reset )
1715                 cont->error(); /* a reset just after a reset. BAD! */
1716         cont->redo();
1717 }
1718 
1719 /*
1720  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1721  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1722  */
1723 static void reset_fdc(void)
     /*  */
1724 {
1725         SET_INTR(reset_interrupt);
1726         FDCS->reset = 0;
1727         reset_fdc_info(0);
1728         if ( FDCS->version >= FDC_82077 )
1729                 fd_outb(0x80 | ( FDCS->dtr &3), FD_STATUS);
1730         else {
1731                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1732                 udelay(FD_RESET_DELAY);
1733                 fd_outb(FDCS->dor, FD_DOR);
1734         }
1735 }
1736 
1737 static void empty(void)
     /*  */
1738 {
1739 }
1740 
1741 void show_floppy(void)
     /*  */
1742 {
1743         int i;
1744 
1745         printk("\n");
1746         printk("floppy driver state\n");
1747         printk("-------------------\n");
1748         printk("now=%ld last interrupt=%d last called handler=%p\n",
1749                jiffies, interruptjiffies, lasthandler);
1750 
1751 
1752 #ifdef CONFIG_FLOPPY_SANITY
1753         printk("timeout_message=%s\n", timeout_message);
1754         printk("last output bytes:\n");
1755         for(i=0; i < OLOGSIZE; i++)
1756                 printk("%2x %2x %ld\n",
1757                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1758                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1759                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1760         printk("last result at %d\n", resultjiffies);
1761         printk("last redo_fd_request at %d\n", lastredo);
1762         for(i=0; i<resultsize; i++){
1763                 printk("%2x ", reply_buffer[i]);
1764         }
1765         printk("\n");
1766 #endif
1767 
1768 #if 0
1769         for(i=0; i<N_FDC; i++){
1770                 if(FDCS->address != -1){
1771                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1772                         fd_outb(fdc_state[i].address+2, fdc_state[i].dor);
1773                         udelay(1000); /* maybe we'll catch an interrupt... */
1774                 }
1775         }
1776 #endif
1777         printk("status=%x\n", fd_inb(FD_STATUS));
1778         printk("fdc_busy=%d\n", fdc_busy);
1779         if( DEVICE_INTR)
1780                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1781         if(floppy_tq.sync)
1782                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1783         if(fd_timer.prev)
1784                 printk("fd_timer.function=%p\n", fd_timer.function);
1785         if(fd_timeout.prev){
1786                 printk("timer_table=%p\n",fd_timeout.function);
1787                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1788                 printk("now=%ld\n",jiffies);
1789         }
1790         printk("cont=%p\n", cont);
1791         printk("CURRENT=%p\n", CURRENT);
1792         printk("command_status=%d\n", command_status);
1793         printk("\n");
1794 }
1795 
1796 static void floppy_shutdown(void)
     /*  */
1797 {
1798         if(!initialising)
1799                 show_floppy();
1800         CLEAR_INTR;
1801         floppy_tq.routine = (void *)(void *) empty;
1802         del_timer( &fd_timer);
1803         sti();
1804 
1805         floppy_enable_hlt();
1806         fd_disable_dma();
1807         /* avoid dma going to a random drive after shutdown */
1808 
1809         if(!initialising)
1810                 DPRINT("floppy timeout\n");
1811         FDCS->reset = 1;
1812         if (cont){
1813                 cont->done(0);
1814                 cont->redo(); /* this will recall reset when needed */
1815         } else {
1816                 printk("no cont in shutdown!\n");
1817                 process_fd_request();
1818         }
1819         is_alive("floppy shutdown");
1820 }
1821 /*typedef void (*timeout_fn)(unsigned long);*/
1822 
1823 /* start motor, check media-changed condition and write protection */
1824 static int start_motor( void (*function)(void)  )
     /*  */
1825 {
1826         int mask, data;
1827 
1828         mask = 0xfc;
1829         data = UNIT(current_drive);
1830         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1831                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1832                         set_debugt();
1833                         /* no read since this drive is running */
1834                         DRS->first_read_date = 0;
1835                         /* note motor start time if motor is not yet running */
1836                         DRS->spinup_date = jiffies;
1837                         data |= (0x10 << UNIT(current_drive));
1838                 }
1839         } else
1840                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1841                         mask &= ~(0x10 << UNIT(current_drive));
1842 
1843         /* starts motor and selects floppy */
1844         del_timer(motor_off_timer + current_drive);
1845         set_dor( fdc, mask, data);
1846 
1847         /* wait_for_completion also schedules reset if needed. */
1848         return(wait_for_completion(DRS->select_date+DP->select_delay,
1849                                    (timeout_fn) function));
1850 }
1851 
1852 static void floppy_ready(void)
     /*  */
1853 {
1854         CHECK_RESET;
1855         if(start_motor(floppy_ready)) return;
1856         if(fdc_dtr()) return;
1857 
1858 #ifdef DCL_DEBUG
1859         if (DP->flags & FD_DEBUG){
1860                 DPRINT("calling disk change from floppy_ready\n");
1861         }
1862 #endif
1863 
1864         if(!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1865            disk_change(current_drive) &&
1866            !DP->select_delay)
1867                 twaddle(); /* this clears the dcl on certain drive/controller
1868                             * combinations */
1869 
1870         if ( raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1871                 perpendicular_mode();
1872                 fdc_specify(); /* must be done here because of hut, hlt ... */
1873                 seek_floppy();
1874         } else
1875                 setup_rw_floppy();
1876 }
1877 
1878 static void floppy_start(void)
     /*  */
1879 {
1880         reschedule_timeout(CURRENTD, "floppy start", 0);
1881 
1882         scandrives();
1883 #ifdef DCL_DEBUG
1884         if (DP->flags & FD_DEBUG){
1885                 DPRINT("setting NEWCHANGE in floppy_start\n");
1886         }
1887 #endif
1888         SETF(FD_DISK_NEWCHANGE);
1889         floppy_ready();
1890 }
1891 
1892 /*
1893  * ========================================================================
1894  * here ends the bottom half. Exported routines are:
1895  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1896  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1897  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1898  * and set_dor.
1899  * ========================================================================
1900  */
1901 /*
1902  * General purpose continuations.
1903  * ==============================
1904  */
1905 
1906 static void do_wakeup(void)
     /*  */
1907 {
1908         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1909         cont = 0;
1910         command_status += 2;
1911         wake_up(&command_done);
1912 }
1913 
1914 static struct cont_t wakeup_cont={
1915         empty,
1916         do_wakeup,
1917         empty,
1918         (done_f)empty
1919 };
1920 
1921 static int wait_til_done(void (*handler)(void ), int interruptible)
     /*  */
1922 {
1923         int ret;
1924 
1925         floppy_tq.routine = (void *)(void *) handler;
1926         queue_task(&floppy_tq, &tq_timer);
1927 
1928         cli();
1929         while(command_status < 2 && NO_SIGNAL){
1930                 is_alive("wait_til_done");
1931                 if(interruptible)
1932                         interruptible_sleep_on(&command_done);
1933                 else
1934                         sleep_on(&command_done);
1935         }
1936         if(command_status < 2){
1937                 floppy_shutdown();
1938                 sti();
1939                 process_fd_request();
1940                 return -EINTR;
1941         }
1942         sti();
1943 
1944         if ( FDCS->reset )
1945                 command_status = FD_COMMAND_ERROR;
1946         if ( command_status == FD_COMMAND_OKAY )
1947                 ret=0;
1948         else
1949                 ret=-EIO;
1950         command_status = FD_COMMAND_NONE;
1951         return ret;
1952 }
1953 
1954 static void generic_done(int result)
     /*  */
1955 {
1956         command_status = result;
1957         cont = &wakeup_cont;
1958 }
1959 
1960 static void generic_success(void)
     /*  */
1961 {
1962         cont->done(1);
1963 }
1964 
1965 static void generic_failure(void)
     /*  */
1966 {
1967         cont->done(0);
1968 }
1969 
1970 static void success_and_wakeup(void)
     /*  */
1971 {
1972         generic_success();
1973         cont->redo();
1974 }
1975 
1976 
1977 /*
1978  * formatting and rw support.
1979  * ==========================
1980  */
1981 
1982 static int next_valid_format(void)
     /*  */
1983 {
1984         int probed_format;
1985 
1986         probed_format = DRS->probed_format;
1987         while(1){
1988                 if ( probed_format >= 8 ||
1989                      ! DP->autodetect[probed_format] ){
1990                         DRS->probed_format = 0;
1991                         return 1;
1992                 }
1993                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1994                         DRS->probed_format = probed_format;
1995                         return 0;
1996                 }
1997                 probed_format++;
1998         }
1999 }
2000 
2001 static void bad_flp_intr(void)
     /*  */
2002 {
2003         if ( probing ){
2004                 DRS->probed_format++;
2005                 if ( !next_valid_format())
2006                         return;
2007         }
2008         (*errors)++;
2009         if (*errors > DRWE->badness)
2010                 DRWE->badness = *errors;
2011         if (*errors > DP->max_errors.abort)
2012                 cont->done(0);
2013         if (*errors > DP->max_errors.reset)
2014                 FDCS->reset = 1;
2015         else if (*errors > DP->max_errors.recal)
2016                 DRS->track = NEED_2_RECAL;
2017 }
2018 
2019 static void set_floppy(kdev_t device)
     /*  */
2020 {
2021         if (TYPE(device))
2022                 floppy = TYPE(device) + floppy_type;
2023         else
2024                 floppy = current_type[ DRIVE(device) ];
2025 }
2026 
2027 /*
2028  * formatting and support.
2029  * =======================
2030  */
2031 static void format_interrupt(void)
     /*  */
2032 {
2033         switch (interpret_errors()){
2034                 case 1:
2035                         cont->error();
2036                 case 2:
2037                         break;
2038                 case 0:
2039                         cont->done(1);
2040         }
2041         cont->redo();
2042 }
2043 
2044 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
2045 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
2046 #define CT(x) ( (x) | 0x40 )
2047 static void setup_format_params(int track)
     /*  */
2048 {
2049         struct fparm {
2050                 unsigned char track,head,sect,size;
2051         } *here = (struct fparm *)floppy_track_buffer;
2052         int il,n;
2053         int count,head_shift,track_shift;
2054 
2055         raw_cmd = &default_raw_cmd;
2056         raw_cmd->track = track;
2057 
2058         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2059                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
2060         raw_cmd->rate = floppy->rate & 0x3;
2061         raw_cmd->cmd_count = NR_F;
2062         COMMAND = FM_MODE(floppy,FD_FORMAT);
2063         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
2064         F_SIZECODE = FD_SIZECODE(floppy);
2065         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
2066         F_GAP = floppy->fmt_gap;
2067         F_FILL = FD_FILL_BYTE;
2068 
2069         raw_cmd->kernel_data = floppy_track_buffer;
2070         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2071 
2072         /* allow for about 30ms for data transport per track */
2073         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
2074 
2075         /* a ``cylinder'' is two tracks plus a little stepping time */
2076         track_shift = 2 * head_shift + 3;
2077 
2078         /* position of logical sector 1 on this track */
2079         n = (track_shift * format_req.track + head_shift * format_req.head )
2080                 % F_SECT_PER_TRACK;
2081 
2082         /* determine interleave */
2083         il = 1;
2084         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2085                 il++;
2086 
2087         /* initialize field */
2088         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2089                 here[count].track = format_req.track;
2090                 here[count].head = format_req.head;
2091                 here[count].sect = 0;
2092                 here[count].size = F_SIZECODE;
2093         }
2094         /* place logical sectors */
2095         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2096                 here[n].sect = count;
2097                 n = (n+il) % F_SECT_PER_TRACK;
2098                 if (here[n].sect) { /* sector busy, find next free sector */
2099                         ++n;
2100                         if (n>= F_SECT_PER_TRACK) {
2101                                 n-=F_SECT_PER_TRACK;
2102                                 while (here[n].sect) ++n;
2103                         }
2104                 }
2105         }
2106 }
2107 
2108 static void redo_format(void)
     /*  */
2109 {
2110         buffer_track = -1;
2111         setup_format_params(format_req.track << STRETCH(floppy));
2112         floppy_start();
2113 #ifdef DEBUGT
2114         debugt("queue format request");
2115 #endif
2116 }
2117 
2118 static struct cont_t format_cont={
2119         format_interrupt,
2120         redo_format,
2121         bad_flp_intr,
2122         generic_done };
2123 
2124 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /*  */
2125 {
2126         int ret;
2127         int drive=DRIVE(device);
2128 
2129         LOCK_FDC(drive,1);
2130         set_floppy(device);
2131         if (!floppy ||
2132             floppy->track > DP->tracks ||
2133             tmp_format_req->track >= floppy->track ||
2134             tmp_format_req->head >= floppy->head ||
2135             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2136             !floppy->fmt_gap) {
2137                 process_fd_request();
2138                 return -EINVAL;
2139         }
2140         format_req = *tmp_format_req;
2141         format_errors = 0;
2142         cont = &format_cont;
2143         errors = &format_errors;
2144         IWAIT(redo_format);
2145         process_fd_request();
2146         return ret;
2147 }
2148 
2149 /*
2150  * Buffer read/write and support
2151  * =============================
2152  */
2153 
2154 /* new request_done. Can handle physical sectors which are smaller than a
2155  * logical buffer */
2156 static void request_done(int uptodate)
     /*  */
2157 {
2158         int block;
2159 
2160         probing = 0;
2161         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2162 
2163         if (!CURRENT){
2164                 DPRINT("request list destroyed in floppy request done\n");
2165                 return;
2166         }
2167         if (uptodate){
2168                 /* maintain values for invalidation on geometry
2169                  * change */
2170                 block = current_count_sectors + CURRENT->sector;
2171                 if (block > DRS->maxblock)
2172                         DRS->maxblock=block;
2173                 if ( block > floppy->sect)
2174                         DRS->maxtrack = 1;
2175 
2176                 /* unlock chained buffers */
2177                 while (current_count_sectors && CURRENT &&
2178                        current_count_sectors >= CURRENT->current_nr_sectors ){
2179                         current_count_sectors -= CURRENT->current_nr_sectors;
2180                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2181                         CURRENT->sector += CURRENT->current_nr_sectors;
2182                         end_request(1);
2183                 }
2184                 if ( current_count_sectors && CURRENT){
2185                         /* "unlock" last subsector */
2186                         CURRENT->buffer += current_count_sectors <<9;
2187                         CURRENT->current_nr_sectors -= current_count_sectors;
2188                         CURRENT->nr_sectors -= current_count_sectors;
2189                         CURRENT->sector += current_count_sectors;
2190                         return;
2191                 }
2192 
2193                 if ( current_count_sectors && ! CURRENT )
2194                         DPRINT("request list destroyed in floppy request done\n");
2195 
2196         } else {
2197                 if(CURRENT->cmd == WRITE) {
2198                         /* record write error information */
2199                         DRWE->write_errors++;
2200                         if(DRWE->write_errors == 1) {
2201                                 DRWE->first_error_sector = CURRENT->sector;
2202                                 DRWE->first_error_generation = DRS->generation;
2203                         }
2204                         DRWE->last_error_sector = CURRENT->sector;
2205                         DRWE->last_error_generation = DRS->generation;
2206                 }
2207                 end_request(0);
2208         }
2209 }
2210 
2211 /* Interrupt handler evaluating the result of the r/w operation */
2212 static void rw_interrupt(void)
     /*  */
2213 {
2214         int nr_sectors, ssize;
2215 
2216         if ( ! DRS->first_read_date )
2217                 DRS->first_read_date = jiffies;
2218 
2219         nr_sectors = 0;
2220         CODE2SIZE;
2221         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2222                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2223                 (sector_t % floppy->sect) % ssize;
2224 
2225 #ifdef CONFIG_FLOPPY_SANITY
2226         if ( nr_sectors > current_count_sectors + ssize -
2227              (current_count_sectors + sector_t) % ssize +
2228              sector_t % ssize){
2229                 DPRINT2("long rw: %x instead of %lx\n",
2230                         nr_sectors, current_count_sectors);
2231                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2232                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2233                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2234                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2235                        sector_t, ssize);
2236         }
2237 #endif
2238         if ( nr_sectors < 0 )
2239                 nr_sectors = 0;
2240         if ( nr_sectors < current_count_sectors )
2241                 current_count_sectors = nr_sectors;
2242 
2243         switch (interpret_errors()){
2244                 case 2:
2245                         cont->redo();
2246                         return;
2247                 case 1:
2248                         if (  !current_count_sectors){
2249                                 cont->error();
2250                                 cont->redo();
2251                                 return;
2252                         }
2253                         break;
2254                 case 0:
2255                         if (  !current_count_sectors){
2256                                 cont->redo();
2257                                 return;
2258                         }
2259                         current_type[current_drive] = floppy;
2260                         floppy_sizes[TOMINOR(current_drive) ]= floppy->size>>1;
2261                         break;
2262         }
2263 
2264         if (probing) {
2265                 if (DP->flags & FTD_MSG)
2266                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2267                                 floppy->name,current_drive);
2268                 current_type[current_drive] = floppy;
2269                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2270                 probing = 0;
2271         }
2272 
2273         if ( CT(COMMAND) != FD_READ || 
2274              raw_cmd->kernel_data == CURRENT->buffer ){
2275                 /* transfer directly from buffer */
2276                 cont->done(1);
2277         } else if ( CT(COMMAND) == FD_READ){
2278                 buffer_track = raw_cmd->track;
2279                 buffer_drive = current_drive;
2280                 if ( nr_sectors + sector_t > buffer_max )
2281                         buffer_max = nr_sectors + sector_t;
2282         }
2283         cont->redo();
2284 }
2285 
2286 /* Compute maximal contiguous buffer size. */
2287 static int buffer_chain_size(void)
     /*  */
2288 {
2289         struct buffer_head *bh;
2290         int size;
2291         char *base;
2292 
2293         base = CURRENT->buffer;
2294         size = CURRENT->current_nr_sectors << 9;
2295         bh = CURRENT->bh;
2296 
2297         if (bh){
2298                 bh = bh->b_reqnext;
2299                 while ( bh && bh->b_data == base + size ){
2300                         size += bh->b_size;
2301                         bh = bh->b_reqnext;
2302                 }
2303         }
2304         return size >> 9;
2305 }
2306 
2307 /* Compute the maximal transfer size */
2308 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2309 {
2310         if ( max_sector > sector_t + max_size)
2311                 max_sector = sector_t + max_size;
2312 
2313         /* alignment */
2314         max_sector -= (max_sector % floppy->sect ) % ssize;
2315 
2316         /* transfer size, beginning not aligned */
2317         current_count_sectors = max_sector - sector_t ;
2318 
2319         return max_sector;
2320 }
2321 
2322 /*
2323  * Move data from/to the track buffer to/from the buffer cache.
2324  */
2325 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2326 {
2327         int remaining; /* number of transferred 512-byte sectors */
2328         struct buffer_head *bh;
2329         char *buffer, *dma_buffer;
2330         int size;
2331 
2332         if ( max_sector > max_sector_2 )
2333                 max_sector = max_sector_2;
2334 
2335         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2336 
2337         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2338             buffer_max > sector_t + CURRENT->nr_sectors){
2339                 current_count_sectors = buffer_max - sector_t;
2340                 if ( current_count_sectors > CURRENT->nr_sectors )
2341                         current_count_sectors = CURRENT->nr_sectors;
2342         }
2343         remaining = current_count_sectors << 9;
2344 #ifdef CONFIG_FLOPPY_SANITY
2345         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2346             CT(COMMAND) == FD_WRITE ){
2347                 DPRINT("in copy buffer\n");
2348                 printk("current_count_sectors=%ld\n", current_count_sectors);
2349                 printk("remaining=%d\n", remaining >> 9);
2350                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2351                 printk("CURRENT->current_nr_sectors=%ld\n",
2352                        CURRENT->current_nr_sectors);
2353                 printk("max_sector=%d\n", max_sector);
2354                 printk("ssize=%d\n", ssize);
2355         }
2356 #endif
2357 
2358         if ( max_sector > buffer_max )
2359                 buffer_max = max_sector;
2360 
2361         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2362 
2363         bh = CURRENT->bh;
2364         size = CURRENT->current_nr_sectors << 9;
2365         buffer = CURRENT->buffer;
2366 
2367         while ( remaining > 0){
2368                 if ( size > remaining )
2369                         size = remaining;
2370 #ifdef CONFIG_FLOPPY_SANITY
2371                 if (dma_buffer + size >
2372                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2373                     dma_buffer < floppy_track_buffer ){
2374                         DPRINT1("buffer overrun in copy buffer %d\n",
2375                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2376                         printk("sector_t=%d buffer_min=%d\n",
2377                                sector_t, buffer_min);
2378                         printk("current_count_sectors=%ld\n",
2379                                current_count_sectors);
2380                         if ( CT(COMMAND) == FD_READ )
2381                                 printk("read\n");
2382                         if ( CT(COMMAND) == FD_READ )
2383                                 printk("write\n");
2384                         break;
2385                 }
2386                 if ( ((unsigned long)buffer) % 512 )
2387                         DPRINT1("%p buffer not aligned\n", buffer);
2388 #endif
2389                 if ( CT(COMMAND) == FD_READ ) {
2390                         fd_cacheflush(dma_buffer, size);
2391                         memcpy( buffer, dma_buffer, size);
2392                 }       
2393                 else {
2394                         memcpy( dma_buffer, buffer, size);
2395                         fd_cacheflush(dma_buffer, size);
2396                 }       
2397                 remaining -= size;
2398                 if ( !remaining)
2399                         break;
2400 
2401                 dma_buffer += size;
2402                 bh = bh->b_reqnext;
2403 #ifdef CONFIG_FLOPPY_SANITY
2404                 if ( !bh){
2405                         DPRINT("bh=null in copy buffer after copy\n");
2406                         break;
2407                 }
2408 #endif
2409                 size = bh->b_size;
2410                 buffer = bh->b_data;
2411         }
2412 #ifdef CONFIG_FLOPPY_SANITY
2413         if ( remaining ){
2414                 if ( remaining > 0 )
2415                         max_sector -= remaining >> 9;
2416                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2417         }
2418 #endif
2419 }
2420 
2421 /*
2422  * Formulate a read/write request.
2423  * this routine decides where to load the data (directly to buffer, or to
2424  * tmp floppy area), how much data to load (the size of the buffer, the whole
2425  * track, or a single sector)
2426  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2427  * allocation on the fly, it should be done here. No other part should need
2428  * modification.
2429  */
2430 
2431 static int make_raw_rw_request(void)
     /*  */
2432 {
2433         int aligned_sector_t;
2434         int max_sector, max_size, tracksize, ssize;
2435 
2436         set_fdc(DRIVE(CURRENT->rq_dev));
2437 
2438         raw_cmd = &default_raw_cmd;
2439         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2440                 FD_RAW_NEED_SEEK;
2441         raw_cmd->cmd_count = NR_RW;
2442         if (CURRENT->cmd == READ){
2443                 raw_cmd->flags |= FD_RAW_READ;
2444                 COMMAND = FM_MODE(floppy,FD_READ);
2445         } else if (CURRENT->cmd == WRITE){
2446                 raw_cmd->flags |= FD_RAW_WRITE;
2447                 COMMAND = FM_MODE(floppy,FD_WRITE);
2448         } else {
2449                 DPRINT("make_raw_rw_request: unknown command\n");
2450                 return 0;
2451         }
2452 
2453         max_sector = floppy->sect * floppy->head;
2454 
2455         TRACK = CURRENT->sector / max_sector;
2456         sector_t = CURRENT->sector % max_sector;
2457         if ( floppy->track && TRACK >= floppy->track )
2458                 return 0;
2459         HEAD = sector_t / floppy->sect;
2460 
2461         if (((floppy->stretch & FD_SWAPSIDES) || TESTF( FD_NEED_TWADDLE)) &&
2462             sector_t < floppy->sect )
2463                 max_sector = floppy->sect;
2464 
2465         /* 2M disks have phantom sectors on the first track */
2466         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2467                 max_sector = 2 * floppy->sect / 3;
2468                 if (sector_t >= max_sector){
2469                         current_count_sectors =  (floppy->sect - sector_t);
2470                         if ( current_count_sectors > CURRENT->nr_sectors )
2471                                 current_count_sectors = CURRENT->nr_sectors;
2472                         return 1;
2473                 }
2474                 SIZECODE = 2;
2475         } else
2476                 SIZECODE = FD_SIZECODE(floppy);
2477         raw_cmd->rate = floppy->rate & 3;
2478         if ((floppy->rate & FD_2M) &&
2479             (TRACK || HEAD ) &&
2480             raw_cmd->rate == 2)
2481                 raw_cmd->rate = 1;
2482 
2483         if ( SIZECODE )
2484                 SIZECODE2 = 0xff;
2485         else
2486                 SIZECODE2 = 0x80;
2487         raw_cmd->track = TRACK << STRETCH(floppy);
2488         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2489         GAP = floppy->gap;
2490         CODE2SIZE;
2491         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2492         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2493         tracksize = floppy->sect - floppy->sect % ssize;
2494         if ( tracksize < floppy->sect ){
2495                 SECT_PER_TRACK ++;
2496                 if (  tracksize <= sector_t % floppy->sect)
2497                         SECTOR--;
2498                 while ( tracksize <= sector_t % floppy->sect){
2499                         while( tracksize + ssize > floppy->sect ){
2500                                 SIZECODE--;
2501                                 ssize >>= 1;
2502                         }
2503                         SECTOR++; SECT_PER_TRACK ++;
2504                         tracksize += ssize;
2505                 }
2506                 max_sector = HEAD * floppy->sect + tracksize;
2507         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2508                 max_sector = floppy->sect;
2509 
2510         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2511         max_size = CURRENT->nr_sectors;
2512         if ((raw_cmd->track == buffer_track) && (current_drive == buffer_drive) &&
2513             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2514                 /* data already in track buffer */
2515                 if (CT(COMMAND) == FD_READ) {
2516                         copy_buffer(1, max_sector, buffer_max);
2517                         return 1;
2518                 }
2519         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2520                 if (CT(COMMAND) == FD_WRITE){
2521                         if(sector_t + CURRENT->nr_sectors > ssize &&
2522                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2523                                 max_size = ssize + ssize;
2524                         else
2525                                 max_size = ssize;
2526                 }
2527                 raw_cmd->flags &= ~FD_RAW_WRITE;
2528                 raw_cmd->flags |= FD_RAW_READ;
2529                 COMMAND = FM_MODE(floppy,FD_READ);
2530         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS ) {
2531                 int direct, indirect;
2532 
2533                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2534                         sector_t;
2535 
2536                 max_size = buffer_chain_size();
2537                 if ( max_size > ( MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9)
2538                         max_size=(MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9;
2539                 /* 64 kb boundaries */
2540                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2541                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2542                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2543                 /*
2544                  * We try to read tracks, but if we get too many errors, we
2545                  * go back to reading just one sector at a time.
2546                  *
2547                  * This means we should be able to read a sector even if there
2548                  * are other bad sectors on this track.
2549                  */
2550                 if (!direct ||
2551                     (indirect * 2 > direct * 3 &&
2552                      *errors < DP->max_errors.read_track &&
2553                      /*!TESTF( FD_NEED_TWADDLE) &&*/
2554                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2555                         max_size = CURRENT->nr_sectors;
2556                 } else {
2557                         raw_cmd->kernel_data = CURRENT->buffer;
2558                         raw_cmd->length = current_count_sectors << 9;
2559                         if (raw_cmd->length == 0){
2560                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2561                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2562                                         indirect, direct, sector_t);
2563                                 return 0;
2564                         }
2565                         return 2;
2566                 }
2567         }
2568 
2569         if ( CT(COMMAND) == FD_READ )
2570                 max_size = max_sector; /* unbounded */
2571 
2572         /* claim buffer track if needed */
2573         if (buffer_track != raw_cmd->track ||  /* bad track */
2574             buffer_drive !=current_drive || /* bad drive */
2575             sector_t > buffer_max ||
2576             sector_t < buffer_min ||
2577             ((CT(COMMAND) == FD_READ ||
2578               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2579              max_sector > 2 * max_buffer_sectors + buffer_min &&
2580              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2581             /* not enough space */ ){
2582                 buffer_track = -1;
2583                 buffer_drive = current_drive;
2584                 buffer_max = buffer_min = aligned_sector_t;
2585         }
2586         raw_cmd->kernel_data = floppy_track_buffer + 
2587                 ((aligned_sector_t-buffer_min )<<9);
2588 
2589         if ( CT(COMMAND) == FD_WRITE ){
2590                 /* copy write buffer to track buffer.
2591                  * if we get here, we know that the write
2592                  * is either aligned or the data already in the buffer
2593                  * (buffer will be overwritten) */
2594 #ifdef CONFIG_FLOPPY_SANITY
2595                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2596                         DPRINT("internal error offset !=0 on write\n");
2597 #endif
2598                 buffer_track = raw_cmd->track;
2599                 buffer_drive = current_drive;
2600                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2601         } else
2602                 transfer_size(ssize, max_sector,
2603                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2604 
2605         /* round up current_count_sectors to get dma xfer size */
2606         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2607         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2608         raw_cmd->length <<= 9;
2609 #ifdef CONFIG_FLOPPY_SANITY
2610         if ((raw_cmd->length < current_count_sectors << 9) ||
2611             (raw_cmd->kernel_data != CURRENT->buffer &&
2612              CT(COMMAND) == FD_WRITE &&
2613              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2614               aligned_sector_t < buffer_min )) ||
2615             raw_cmd->length % ( 128 << SIZECODE ) ||
2616             raw_cmd->length <= 0 || current_count_sectors <= 0){
2617                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2618                         raw_cmd->length, current_count_sectors);
2619                 if ( raw_cmd->kernel_data != CURRENT->buffer )
2620                         printk("addr=%d, length=%ld\n",
2621                                (int) ((raw_cmd->kernel_data - 
2622                                        floppy_track_buffer ) >> 9),
2623                                current_count_sectors);
2624                 printk("st=%d ast=%d mse=%d msi=%d\n",
2625                        sector_t, aligned_sector_t, max_sector, max_size);
2626                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2627                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2628                        COMMAND, SECTOR, HEAD, TRACK);
2629                 printk("buffer drive=%d\n", buffer_drive);
2630                 printk("buffer track=%d\n", buffer_track);
2631                 printk("buffer_min=%d\n", buffer_min );
2632                 printk("buffer_max=%d\n", buffer_max );
2633                 return 0;
2634         }
2635 
2636         if (raw_cmd->kernel_data != CURRENT->buffer ){
2637                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2638                     current_count_sectors < 0 ||
2639                     raw_cmd->length < 0 ||
2640                     raw_cmd->kernel_data + raw_cmd->length >
2641                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2642                         DPRINT("buffer overrun in schedule dma\n");
2643                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2644                                sector_t, buffer_min,
2645                                raw_cmd->length >> 9 );
2646                         printk("current_count_sectors=%ld\n",
2647                                current_count_sectors);
2648                         if ( CT(COMMAND) == FD_READ )
2649                                 printk("read\n");
2650                         if ( CT(COMMAND) == FD_READ )
2651                                 printk("write\n");
2652                         return 0;
2653                 }
2654         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2655                    current_count_sectors > CURRENT->nr_sectors){
2656                 DPRINT("buffer overrun in direct transfer\n");
2657                 return 0;
2658         } else if ( raw_cmd->length < current_count_sectors << 9 ){
2659                 DPRINT("more sectors than bytes\n");
2660                 printk("bytes=%ld\n", raw_cmd->length >> 9 );
2661                 printk("sectors=%ld\n", current_count_sectors);
2662         }
2663         if (raw_cmd->length == 0){
2664                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2665                 return 0;
2666         }
2667 #endif
2668         return 2;
2669 }
2670 
2671 static void redo_fd_request(void)
     /*  */
2672 {
2673 #define REPEAT {request_done(0); continue; }
2674         kdev_t device;
2675         int tmp;
2676 
2677         lastredo = jiffies;
2678         if (current_drive < N_DRIVE)
2679                 floppy_off(current_drive);
2680 
2681         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2682                 DPRINT("current not active!\n");
2683                 return;
2684         }
2685 
2686         while(1){
2687                 if (!CURRENT) {
2688                         CLEAR_INTR;
2689                         unlock_fdc();
2690                         return;
2691                 }
2692                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2693                         panic(DEVICE_NAME ": request list destroyed");
2694                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2695                         panic(DEVICE_NAME ": block not locked");
2696 
2697                 device = CURRENT->rq_dev;
2698                 set_fdc(DRIVE(device));
2699                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2700 
2701                 set_floppy(device);
2702                 raw_cmd = & default_raw_cmd;
2703                 raw_cmd->flags = 0;
2704                 if(start_motor(redo_fd_request)) return;
2705                 if(test_bit(current_drive, &fake_change) ||
2706                    TESTF(FD_DISK_CHANGED)){
2707                         DPRINT("disk absent or changed during operation\n");
2708                         REPEAT;
2709                 }
2710                 if (!floppy) { /* Autodetection */
2711                         if (!probing){
2712                                 DRS->probed_format = 0;
2713                                 if ( next_valid_format() ){
2714                                         DPRINT("no autodetectable formats\n");
2715                                         floppy = NULL;
2716                                         REPEAT;
2717                                 }
2718                         }
2719                         probing = 1;
2720                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2721                 } else
2722                         probing = 0;
2723                 errors = & (CURRENT->errors);
2724                 tmp = make_raw_rw_request();
2725                 if ( tmp < 2 ){
2726                         request_done(tmp);
2727                         continue;
2728                 }
2729 
2730                 if (TESTF(FD_NEED_TWADDLE))
2731                         twaddle();
2732                 floppy_tq.routine = (void *)(void *) floppy_start;
2733                 queue_task(&floppy_tq, &tq_timer);
2734 #ifdef DEBUGT
2735                 debugt("queue fd request");
2736 #endif
2737                 return;
2738         }
2739 #undef REPEAT
2740 }
2741 
2742 static struct cont_t rw_cont={
2743         rw_interrupt,
2744         redo_fd_request,
2745         bad_flp_intr,
2746         request_done };
2747 
2748 struct tq_struct request_tq =
2749 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2750 
2751 static void process_fd_request(void)
     /*  */
2752 {
2753         cont = &rw_cont;
2754         queue_task(&request_tq, &tq_timer);
2755 }
2756 
2757 static void do_fd_request(void)
     /*  */
2758 {
2759         if (fdc_busy){
2760                 /* fdc busy, this new request will be treated when the
2761                    current one is done */
2762                 is_alive("do fd request, old request running");
2763                 return;
2764         }
2765         /* fdc_busy cannot be set by an interrupt or a bh */
2766         floppy_grab_irq_and_dma();
2767         fdc_busy=1;
2768         reschedule_timeout(MAXTIMEOUT, "do fd request",0);
2769         process_fd_request();
2770         is_alive("do fd request");
2771 }
2772 
2773 static struct cont_t poll_cont={
2774         success_and_wakeup,
2775         floppy_ready,
2776         generic_failure,
2777         generic_done };
2778 
2779 static int poll_drive(int interruptible, int flag)
     /*  */
2780 {
2781         int ret;
2782         /* no auto-sense, just clear dcl */
2783         raw_cmd = &default_raw_cmd;
2784         raw_cmd->flags= flag;
2785         raw_cmd->track=0;
2786         raw_cmd->cmd_count=0;
2787         cont = &poll_cont;
2788 #ifdef DCL_DEBUG
2789         if (DP->flags & FD_DEBUG){
2790                 DPRINT("setting NEWCHANGE in poll_drive\n");
2791         }
2792 #endif
2793         SETF(FD_DISK_NEWCHANGE);
2794         WAIT(floppy_ready);
2795         return ret;
2796 }
2797 
2798 /*
2799  * User triggered reset
2800  * ====================
2801  */
2802 
2803 static void reset_intr(void)
     /*  */
2804 {
2805         printk("weird, reset interrupt called\n");
2806 }
2807 
2808 static struct cont_t reset_cont={
2809         reset_intr,
2810         success_and_wakeup,
2811         generic_failure,
2812         generic_done };
2813 
2814 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2815 {
2816         int ret;
2817 
2818         ret=0;
2819         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2820                 return 0;
2821         LOCK_FDC(drive,interruptible);
2822         if(arg == FD_RESET_ALWAYS)
2823                 FDCS->reset=1;
2824         if ( FDCS->reset ){
2825                 cont = &reset_cont;
2826                 reschedule_timeout(CURRENTD, "user reset fdc", 0);
2827                 WAIT(reset_fdc);
2828         }
2829         process_fd_request();
2830         return ret;
2831 }
2832 
2833 /*
2834  * Misc Ioctl's and support
2835  * ========================
2836  */
2837 static int fd_copyout(void *param, volatile void *address, int size)
     /*  */
2838 {
2839         int i;
2840 
2841         i = verify_area(VERIFY_WRITE,param,size);
2842         if (i)
2843                 return i;
2844         fd_cacheflush(address, size);           /* is this necessary ??? */
2845                         /* Ralf: Yes; only the l2 cache is completly chipset
2846                            controlled */
2847         memcpy_tofs(param,(void *) address, size);
2848         return 0;
2849 }
2850 
2851 static int fd_copyin(void *param, volatile void *address, int size)
     /*  */
2852 {
2853         int i;
2854 
2855         i = verify_area(VERIFY_READ,param,size);
2856         if (i)
2857                 return i;
2858         memcpy_fromfs((void *) address, param, size);
2859         return 0;
2860 }
2861 
2862 #define COPYOUT(x) ECALL(fd_copyout( (void *)param, &(x), sizeof(x)))
2863 #define COPYIN(x) ECALL(fd_copyin( (void *)param, &(x), sizeof(x)))
2864 
2865 static const char *drive_name(int type, int drive )
     /*  */
2866 {
2867         struct floppy_struct *floppy;
2868 
2869         if ( type )
2870                 floppy = floppy_type + type;
2871         else {
2872                 if ( UDP->native_format )
2873                         floppy = floppy_type + UDP->native_format;
2874                 else
2875                         return "(null)";
2876         }
2877         if ( floppy->name )
2878                 return floppy->name;
2879         else
2880                 return "(null)";
2881 }
2882 
2883 
2884 /* raw commands */
2885 static void raw_cmd_done(int flag)
     /*  */
2886 {
2887         int i;
2888 
2889         if(!flag) {
2890                 raw_cmd->flags = FD_RAW_FAILURE;
2891                 raw_cmd->flags |= FD_RAW_HARDFAILURE;
2892         } else {
2893                 raw_cmd->reply_count = inr;
2894                 for( i=0; i< raw_cmd->reply_count; i++)
2895                         raw_cmd->reply[i] = reply_buffer[i];
2896 
2897                 if ( raw_cmd->flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2898                         raw_cmd->length = get_dma_residue(FLOPPY_DMA);
2899                 
2900                 if( (raw_cmd->flags & FD_RAW_SOFTFAILURE) &&
2901                     (!raw_cmd->reply_count || (raw_cmd->reply[0] & 0xc0)))
2902                         raw_cmd->flags |= FD_RAW_FAILURE;
2903 
2904                 if( disk_change(current_drive) )
2905                         raw_cmd->flags |= FD_RAW_DISK_CHANGE;
2906                 else
2907                         raw_cmd->flags &= ~FD_RAW_DISK_CHANGE;
2908                 if(raw_cmd->flags & FD_RAW_NO_MOTOR_AFTER)
2909                         motor_off_callback(current_drive);
2910 
2911                 if(raw_cmd->next &&
2912                    (!(raw_cmd->flags & FD_RAW_FAILURE) ||
2913                     !(raw_cmd->flags & FD_RAW_STOP_IF_FAILURE)) &&
2914                    ((raw_cmd->flags & FD_RAW_FAILURE) ||
2915                     !(raw_cmd->flags &FD_RAW_STOP_IF_SUCCESS))) {
2916                         raw_cmd = raw_cmd->next;
2917                         return;
2918                 }
2919         }
2920         generic_done(flag);
2921 }
2922 
2923 
2924 static struct cont_t raw_cmd_cont={
2925         success_and_wakeup,
2926         floppy_start,
2927         generic_failure,
2928         raw_cmd_done
2929 };
2930 
2931 static inline int raw_cmd_copyout(int cmd, char *param,
     /*  */
2932                                   struct floppy_raw_cmd *ptr)
2933 {
2934         struct old_floppy_raw_cmd old_raw_cmd;
2935         int ret;
2936 
2937         while(ptr) {
2938                 if(cmd == OLDFDRAWCMD) {
2939                         old_raw_cmd.flags = ptr->flags;
2940                         old_raw_cmd.data = ptr->data;
2941                         old_raw_cmd.length = ptr->length;
2942                         old_raw_cmd.rate = ptr->rate;
2943                         old_raw_cmd.reply_count = ptr->reply_count;
2944                         memcpy(old_raw_cmd.reply, ptr->reply, 7);
2945                         COPYOUT(old_raw_cmd);
2946                         param += sizeof(old_raw_cmd);
2947                 } else {
2948                         COPYOUT(*ptr);
2949                         param += sizeof(struct floppy_raw_cmd);
2950                 }
2951 
2952                 if ( (ptr->flags & FD_RAW_READ) && ptr->buffer_length){
2953                         if(ptr->length>=0 && ptr->length<=ptr->buffer_length)
2954                                 ECALL(fd_copyout(ptr->data, 
2955                                                  ptr->kernel_data, 
2956                                                  ptr->buffer_length - 
2957                                                  ptr->length));
2958                 }
2959                 ptr = ptr->next;
2960         }
2961         return 0;
2962 }
2963 
2964 
2965 static void raw_cmd_free(struct floppy_raw_cmd **ptr)
     /*  */
2966 {
2967         struct floppy_raw_cmd **next;
2968 
2969         while(*ptr) {
2970                 next = & (*ptr)->next;
2971                 if((*ptr)->buffer_length) {
2972                         free_pages((unsigned long)(*ptr)->kernel_data,
2973                                    __get_order((*ptr)->buffer_length));
2974                         (*ptr)->buffer_length = 0;
2975                 }
2976                 kfree(*ptr);
2977                 *ptr = 0;
2978                 ptr = next;
2979         }
2980 }
2981 
2982 
2983 static inline int raw_cmd_copyin(int cmd, char *param,
     /*  */
2984                                  struct floppy_raw_cmd **rcmd)
2985 {
2986         struct floppy_raw_cmd *ptr;
2987         struct old_floppy_raw_cmd old_raw_cmd;
2988         int ret;
2989         int i;
2990         
2991         *rcmd = 0;
2992         while(1) {
2993                 ptr = (struct floppy_raw_cmd *) 
2994                         kmalloc(sizeof(struct floppy_raw_cmd ), GFP_USER);
2995                 if(!ptr)
2996                         return -ENOMEM;
2997                 ptr->next = 0;
2998                 ptr->buffer_length = 0;
2999                 *rcmd = ptr;
3000                 if(cmd == OLDFDRAWCMD){
3001                         COPYIN(old_raw_cmd);
3002                         ptr->flags = old_raw_cmd.flags;
3003                         ptr->data = old_raw_cmd.data;
3004                         ptr->length = old_raw_cmd.length;
3005                         ptr->rate = old_raw_cmd.rate;
3006                         ptr->cmd_count = old_raw_cmd.cmd_count;
3007                         ptr->track = old_raw_cmd.track;
3008                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
3009                         if(ptr->cmd_count > 9)
3010                                 return -EINVAL;                 
3011                         ptr->next = 0;
3012                         ptr->phys_length = 0;
3013                         param += sizeof(struct old_floppy_raw_cmd);
3014                 } else {
3015                         COPYIN(*ptr);
3016                         param += sizeof(struct floppy_raw_cmd);
3017                         if(ptr->cmd_count > 16)
3018                                 return -EINVAL;
3019                 }
3020 
3021                 for(i=0; i< 16; i++)
3022                         ptr->reply[i] = 0;
3023                 ptr->resultcode = 0;
3024 
3025                 ptr->next = 0;
3026                 ptr->buffer_length = 0;
3027                 ptr->kernel_data = 0;
3028 
3029                 if(ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3030                         if(!ptr->length)
3031                                 return -EINVAL;
3032 
3033                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
3034                         if(!ptr->kernel_data)
3035                                 return -ENOMEM;
3036                         ptr->buffer_length = ptr->length;
3037                 }
3038                 if(ptr->flags & FD_RAW_WRITE)
3039                         fd_copyin(ptr->data, ptr->kernel_data, ptr->length);
3040                 rcmd = & (ptr->next);
3041                 if( ! (ptr->flags & FD_RAW_MORE))
3042                         return 0;
3043                 ptr->rate &= 0x03;
3044 
3045         }
3046 }
3047 
3048 
3049 static int raw_cmd_ioctl(int cmd, void *param)
     /*  */
3050 {
3051         int drive, ret, ret2;
3052         struct floppy_raw_cmd *my_raw_cmd;
3053 
3054         if ( FDCS->rawcmd <= 1 )
3055                 FDCS->rawcmd = 1;
3056         for ( drive= 0; drive < N_DRIVE; drive++){
3057                 if ( FDC(drive) != fdc)
3058                         continue;
3059                 if ( drive == current_drive ){
3060                         if ( UDRS->fd_ref > 1 ){
3061                                 FDCS->rawcmd = 2;
3062                                 break;
3063                         }
3064                 } else if ( UDRS->fd_ref ){
3065                         FDCS->rawcmd = 2;
3066                         break;
3067                 }
3068         }
3069 
3070         if(FDCS->reset)
3071                 return -EIO;
3072 
3073         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3074         if(ret) {
3075                 raw_cmd_free(&my_raw_cmd);
3076                 return ret;
3077         }
3078 
3079         raw_cmd = my_raw_cmd;
3080         cont = &raw_cmd_cont;
3081         ret=wait_til_done(floppy_start,1);
3082 #ifdef DCL_DEBUG
3083         if (DP->flags & FD_DEBUG){
3084                 DPRINT("calling disk change from raw_cmd ioctl\n");
3085         }
3086 #endif
3087 
3088         if(ret != -EINTR && FDCS->reset)
3089                 ret = -EINTR;
3090 
3091         DRS->track = NO_TRACK;
3092 
3093         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3094         if(!ret)
3095                 ret = ret2;
3096         raw_cmd_free(&my_raw_cmd);
3097         return ret;
3098 }
3099 
3100 static int invalidate_drive(kdev_t rdev)
     /*  */
3101 {
3102         /* invalidate the buffer track to force a reread */
3103         set_bit( DRIVE(rdev), &fake_change);
3104         process_fd_request();
3105         check_disk_change(rdev);
3106         return 0;
3107 }
3108 
3109 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
3110                     unsigned long param)
3111 {
3112 #define IOCTL_MODE_BIT 8
3113 #define OPEN_WRITE_BIT 16
3114 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3115 
3116         struct floppy_struct newparams;
3117         struct format_descr tmp_format_req;
3118         int i,drive,type,cnt;
3119         kdev_t device;
3120         struct floppy_struct *this_floppy;
3121         const char *name;
3122         int ret;
3123 
3124         device = inode->i_rdev;
3125         switch (cmd) {
3126                 RO_IOCTLS(device,param);
3127         }
3128         type = TYPE(device);
3129         drive = DRIVE(device);
3130         switch (cmd) {
3131                 case OLDFDGETDRVTYP:
3132                 case FDGETDRVTYP:
3133                         i=verify_area(VERIFY_WRITE,(void *) param,16);
3134                         if (i)
3135                                 return i;
3136                         name = drive_name(type,drive);
3137                         for ( cnt=0; cnt<16; cnt++){
3138                                 put_user(name[cnt], ((char*)param)+cnt);
3139                                 if ( ! *name )
3140                                         break;
3141                         }
3142                         return 0;
3143                 case OLDFDGETMAXERRS:
3144                 case FDGETMAXERRS:
3145                         COPYOUT(UDP->max_errors);
3146                         return 0;
3147                 case OLDFDGETPRM:
3148                 case FDGETPRM:
3149                         if (type)
3150                                 this_floppy = &floppy_type[type];
3151                         else if ((this_floppy = current_type[drive]) == NULL)
3152                                 return -ENODEV;
3153                         COPYOUT(this_floppy[0]);
3154                         return 0;
3155                 case OLDFDPOLLDRVSTAT:
3156                 case FDPOLLDRVSTAT:
3157                         LOCK_FDC(drive,1);
3158                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3159                         process_fd_request();
3160                         /* fall through */
3161                 case OLDFDGETDRVSTAT:
3162                 case FDGETDRVSTAT:
3163                         COPYOUT(*UDRS);
3164                         return 0;
3165                 case OLDFDGETFDCSTAT:
3166                         COPYOUT(* (struct old_floppy_fdc_state *) UFDCS);
3167                         return 0;
3168                 case FDGETFDCSTAT:
3169                         COPYOUT(*UFDCS);
3170                         return 0;
3171                 case OLDFDGETDRVPRM:
3172                 case FDGETDRVPRM:
3173                         COPYOUT(*UDP);
3174                         return 0;
3175                 case OLDFDWERRORGET:
3176                 case FDWERRORGET:
3177                         COPYOUT(*UDRWE);
3178                         return 0;
3179         }
3180         if (!IOCTL_ALLOWED)
3181                 return -EPERM;
3182         switch (cmd) {
3183                 case OLDFDWERRORCLR:
3184                 case FDWERRORCLR:
3185                         UDRWE->write_errors = 0;
3186                         UDRWE->first_error_sector = 0;
3187                         UDRWE->first_error_generation = 0;
3188                         UDRWE->last_error_sector = 0;
3189                         UDRWE->last_error_generation = 0;
3190                         UDRWE->badness = 0;
3191                         return 0;
3192                 case OLDFDRAWCMD:
3193                 case FDRAWCMD:
3194                         if (type)
3195                                 return -EINVAL;
3196                         LOCK_FDC(drive,1);
3197                         set_floppy(device);
3198                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3199                         process_fd_request();
3200                         return i;
3201                 case OLDFDFMTTRK:
3202                 case FDFMTTRK:
3203                         if (UDRS->fd_ref != 1)
3204                                 return -EBUSY;
3205                         COPYIN(tmp_format_req);
3206                         return do_format(device, &tmp_format_req);
3207                 case OLDFDSETMAXERRS:
3208                 case FDSETMAXERRS:
3209                         COPYIN(UDP->max_errors);
3210                         return 0;
3211                 case OLDFDFMTBEG:
3212                 case FDFMTBEG:
3213                         return 0;
3214                 case OLDFDCLRPRM:
3215                 case FDCLRPRM:
3216                         LOCK_FDC(drive,1);
3217                         current_type[drive] = NULL;
3218                         floppy_sizes[drive] = MAX_DISK_SIZE;
3219                         UDRS->keep_data = 0;
3220                         return invalidate_drive(device);
3221                 case OLDFDFMTEND:
3222                 case FDFMTEND:
3223                 case OLDFDFLUSH:
3224                 case FDFLUSH:
3225                         LOCK_FDC(drive,1);
3226                         return invalidate_drive(device);
3227                 case OLDFDSETPRM:
3228                 case FDSETPRM:
3229                 case OLDFDDEFPRM:
3230                 case FDDEFPRM:
3231                         COPYIN(newparams);
3232                         /* sanity checking for parameters.*/
3233                         if(newparams.sect <= 0 ||
3234                            newparams.head <= 0 ||
3235                            newparams.track <= 0 ||
3236                            newparams.track > UDP->tracks>> STRETCH(&newparams) ||
3237                            /* check if reserved bits are set */
3238                            (newparams.stretch & ~(FD_STRETCH | FD_SWAPSIDES)) != 0)
3239                                 return -EINVAL;
3240                         if ( type){
3241                                 if ( !suser() )
3242                                         return -EPERM;
3243                                 LOCK_FDC(drive,1);
3244                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3245                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3246                                             drive_state[cnt].fd_ref)
3247                                                 set_bit(drive, &fake_change);
3248                                 }
3249                                 floppy_type[type] = newparams;
3250                                 floppy_type[type].name="user format";
3251                                 for (cnt = type << 2 ;
3252                                      cnt < (type << 2 ) + 4 ;
3253                                      cnt++)
3254                                         floppy_sizes[cnt]=
3255                                                 floppy_sizes[cnt+0x80]=
3256                                                 floppy_type[type].size>>1;
3257                                 process_fd_request();
3258                                 for ( cnt = 0; cnt < N_DRIVE; cnt++){
3259                                         if (TYPE(drive_state[cnt].fd_device) == type &&
3260                                             drive_state[cnt].fd_ref)
3261                                                 check_disk_change(drive_state[cnt].
3262                                                                   fd_device);
3263                                 }
3264                                 return 0;
3265                         }
3266 
3267                         LOCK_FDC(drive,1);
3268                         if ( cmd != FDDEFPRM )
3269                                 /* notice a disk change immediately, else
3270                                  * we loose our settings immediately*/
3271                                 CALL(poll_drive(1,0));
3272                         user_params[drive] = newparams;
3273                         if (buffer_drive == drive &&
3274                             buffer_max > user_params[drive].sect)
3275                                 buffer_max=user_params[drive].sect;
3276                         current_type[drive] = &user_params[drive];
3277                         floppy_sizes[drive] = user_params[drive].size >> 1;
3278                         if (cmd == FDDEFPRM)
3279                                 DRS->keep_data = -1;
3280                         else
3281                                 DRS->keep_data = 1;
3282                         /* invalidation. Invalidate only when needed, i.e.
3283                          * when there are already sectors in the buffer cache
3284                          * whose number will change. This is useful, because
3285                          * mtools often changes the geometry of the disk after
3286                          * looking at the boot block */
3287                         if (DRS->maxblock >
3288                             user_params[drive].sect ||
3289                             DRS->maxtrack )
3290                                 invalidate_drive(device);
3291                         else
3292                                 process_fd_request();
3293                         return 0;
3294                 case OLDFDRESET:
3295                 case FDRESET:
3296                         return user_reset_fdc( drive, (int)param, 1);
3297                 case OLDFDMSGON:
3298                 case FDMSGON:
3299                         UDP->flags |= FTD_MSG;
3300                         return 0;
3301                 case OLDFDMSGOFF:
3302                 case FDMSGOFF:
3303                         UDP->flags &= ~FTD_MSG;
3304                         return 0;
3305                 case OLDFDSETEMSGTRESH:
3306                 case FDSETEMSGTRESH:
3307                         UDP->max_errors.reporting =
3308                         (unsigned short) (param & 0x0f);
3309                         return 0;
3310                 case OLDFDTWADDLE:
3311                 case FDTWADDLE:
3312                         LOCK_FDC(drive,1);
3313                         twaddle();
3314                         process_fd_request();
3315         }
3316         if ( ! suser() )
3317                 return -EPERM;
3318         switch(cmd){
3319                 case OLDFDSETDRVPRM:
3320                 case FDSETDRVPRM:
3321                         COPYIN(*UDP);
3322                         return 0;
3323                 default:
3324                         return -EINVAL;
3325         }
3326         return 0;
3327 #undef IOCTL_ALLOWED
3328 }
3329 
3330 static void config_types(void)
     /*  */
3331 {
3332         int first=1;
3333         int drive;
3334 
3335         /* read drive info out of physical cmos */
3336         drive=0;
3337         if (!UDP->cmos )
3338                 UDP->cmos= FLOPPY0_TYPE;
3339         drive=1;
3340         if (!UDP->cmos && FLOPPY1_TYPE)
3341                 UDP->cmos = FLOPPY1_TYPE;
3342 
3343         /* XXX */
3344         /* additional physical CMOS drive detection should go here */
3345 
3346         for (drive=0; drive < N_DRIVE; drive++){
3347                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3348                         memcpy((char *) UDP,
3349                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3350                                sizeof(struct floppy_drive_params));
3351                 if (UDP->cmos){
3352                         if (first)
3353                                 printk("Floppy drive(s): ");
3354                         else
3355                                 printk(", ");
3356                         first=0;
3357                         if (UDP->cmos > 0 ){
3358                                 ALLOWED_DRIVE_MASK |= 1 << drive;
3359                                 printk("fd%d is %s", drive,
3360                                        default_drive_params[(int)UDP->cmos].name);
3361                         } else
3362                                 printk("fd%d is unknown type %d",drive,
3363                                        UDP->cmos);
3364                 }
3365         }
3366         if(!first)
3367                 printk("\n");
3368 }
3369 
3370 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
3371                        char * buf, int count)
3372 {
3373         int drive = DRIVE(inode->i_rdev);
3374 
3375         check_disk_change(inode->i_rdev);
3376         if (UTESTF(FD_DISK_CHANGED))
3377                 return -ENXIO;
3378         return block_read(inode, filp, buf, count);
3379 }
3380 
3381 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
3382                         const char * buf, int count)
3383 {
3384         int block;
3385         int ret;
3386         int drive = DRIVE(inode->i_rdev);
3387 
3388         if(!UDRS->maxblock)
3389                 UDRS->maxblock=1;/* make change detectable */
3390         check_disk_change(inode->i_rdev);
3391         if (UTESTF(FD_DISK_CHANGED))
3392                 return -ENXIO;
3393         if(!UTESTF(FD_DISK_WRITABLE))
3394                 return -EROFS;
3395         block = (filp->f_pos + count) >> 9;
3396         if(block > UDRS->maxblock)
3397                 UDRS->maxblock = block;
3398         ret= block_write(inode, filp, buf, count);
3399         return ret;
3400 }
3401 
3402 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
3403 {
3404         int drive;
3405 
3406         drive = DRIVE(inode->i_rdev);
3407 
3408         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3409                 /* if the file is mounted OR (writable now AND writable at
3410                  * open time) Linus: Does this cover all cases? */
3411                 block_fsync(inode,filp);
3412 
3413         if (UDRS->fd_ref < 0)
3414                 UDRS->fd_ref=0;
3415         else if (!UDRS->fd_ref--) {
3416                 DPRINT("floppy_release with fd_ref == 0");
3417                 UDRS->fd_ref = 0;
3418         }
3419         floppy_release_irq_and_dma();
3420 }
3421 
3422 /*
3423  * floppy_open check for aliasing (/dev/fd0 can be the same as
3424  * /dev/PS0 etc), and disallows simultaneous access to the same
3425  * drive with different device numbers.
3426  */
3427 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3428 
3429 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
3430 {
3431         int drive;
3432         int old_dev;
3433         int try;
3434         char *tmp;
3435 
3436         if (!filp) {
3437                 DPRINT("Weird, open called with filp=0\n");
3438                 return -EIO;
3439         }
3440 
3441         drive = DRIVE(inode->i_rdev);
3442 
3443         if (drive >= N_DRIVE ||
3444             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3445             fdc_state[FDC(drive)].version == FDC_NONE)
3446                 return -ENXIO;
3447 
3448         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3449                 return -ENXIO;
3450         old_dev = UDRS->fd_device;
3451         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3452                 return -EBUSY;
3453 
3454         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3455                 USETF(FD_DISK_CHANGED);
3456                 USETF(FD_VERIFY);
3457         }
3458 
3459         if(UDRS->fd_ref == -1 ||
3460            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3461                 return -EBUSY;
3462 
3463         if (floppy_grab_irq_and_dma())
3464                 return -EBUSY;
3465 
3466         if (filp->f_flags & O_EXCL)
3467                 UDRS->fd_ref = -1;
3468         else
3469                 UDRS->fd_ref++;
3470 
3471         if (!floppy_track_buffer){
3472                 /* if opening an ED drive, reserve a big buffer,
3473                  * else reserve a small one */
3474                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3475                         try = 64; /* Only 48 actually useful */
3476                 else
3477                         try = 32; /* Only 24 actually useful */
3478 
3479                 tmp=(char *)dma_mem_alloc(1024 * try);
3480                 if (!tmp) {
3481                         try >>= 1; /* buffer only one side */
3482                         if (try < 16)
3483                                 try=16;
3484                         tmp= (char *)dma_mem_alloc(1024*try);
3485                 }
3486                 if (!tmp) {
3487                         DPRINT("Unable to allocate DMA memory\n");
3488                         RETERR(ENXIO);
3489                 }
3490                 if (floppy_track_buffer){
3491                         free_pages((unsigned long)tmp,__get_order(try*1024));
3492                 }else {
3493                         floppy_track_buffer = tmp;
3494                         max_buffer_sectors = try;
3495                 }
3496         }
3497 
3498         UDRS->fd_device = MINOR(inode->i_rdev);
3499 
3500         if (old_dev && old_dev != inode->i_rdev) {
3501                 if (buffer_drive == drive)
3502                         buffer_track = -1;
3503                 invalidate_buffers(old_dev);
3504         }
3505 
3506         /* Allow ioctls if we have write-permissions even if read-only open */
3507         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3508                 filp->f_mode |= IOCTL_MODE_BIT;
3509         if (filp->f_mode & 2)
3510                 filp->f_mode |= OPEN_WRITE_BIT;
3511 
3512         if (UFDCS->rawcmd == 1)
3513                 UFDCS->rawcmd = 2;
3514 
3515         if (filp->f_flags & O_NDELAY)
3516                 return 0;
3517         if (filp->f_mode & 3) {
3518                 UDRS->last_checked = 0;
3519                 check_disk_change(inode->i_rdev);
3520                 if (UTESTF(FD_DISK_CHANGED))
3521                         RETERR(ENXIO);
3522         }
3523         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3524                 RETERR(EROFS);
3525         return 0;
3526 #undef RETERR
3527 }
3528 
3529 /*
3530  * Check if the disk has been changed or if a change has been faked.
3531  */
3532 static int check_floppy_change(kdev_t dev)
     /*  */
3533 {
3534         int drive = DRIVE( dev );
3535 
3536         if (MAJOR(dev) != MAJOR_NR) {
3537                 DPRINT("floppy_changed: not a floppy\n");
3538                 return 0;
3539         }
3540 
3541         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3542                 return 1;
3543 
3544         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3545                 lock_fdc(drive,0);
3546                 poll_drive(0,0);
3547                 process_fd_request();
3548         }
3549 
3550         if(UTESTF(FD_DISK_CHANGED) ||
3551            UTESTF(FD_VERIFY) ||
3552            test_bit(drive, &fake_change) ||
3553            (!TYPE(dev) && !current_type[drive]))
3554                 return 1;
3555         return 0;
3556 }
3557 
3558 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3559  * the bootblock (block 0). "Autodetection" is also needed to check whether
3560  * there is a disk in the drive at all... Thus we also do it for fixed
3561  * geometry formats */
3562 static int floppy_revalidate(kdev_t dev)
     /*  */
3563 {
3564 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3565         struct buffer_head * bh;
3566         int drive=DRIVE(dev);
3567         int cf;
3568 
3569         if(UTESTF(FD_DISK_CHANGED) ||
3570            UTESTF(FD_VERIFY) ||
3571            test_bit(drive, &fake_change) ||
3572            NO_GEOM){
3573                 lock_fdc(drive,0);
3574                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3575                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3576                         process_fd_request(); /*already done by another thread*/
3577                         return 0;
3578                 }
3579                 UDRS->maxblock = 0;
3580                 UDRS->maxtrack = 0;
3581                 if ( buffer_drive == drive)
3582                         buffer_track = -1;
3583                 clear_bit(drive, &fake_change);
3584                 UCLEARF(FD_DISK_CHANGED);
3585                 if(cf)
3586                         UDRS->generation++;
3587                 if(NO_GEOM){
3588                         /* auto-sensing */
3589                         int size = floppy_blocksizes[MINOR(dev)];
3590                         if (!size)
3591                                 size = 1024;
3592                         if (!(bh = getblk(dev,0,size))){
3593                                 process_fd_request();
3594                                 return 1;
3595                         }
3596                         if ( bh && ! bh->b_uptodate)
3597                                 ll_rw_block(READ, 1, &bh);
3598                         process_fd_request();
3599                         wait_on_buffer(bh);
3600                         brelse(bh);
3601                         return 0;
3602                 }
3603                 if(cf)
3604                         poll_drive(0, FD_RAW_NEED_DISK);
3605                 process_fd_request();
3606         }
3607         return 0;
3608 }
3609 
3610 static struct file_operations floppy_fops = {
3611         NULL,                   /* lseek - default */
3612         floppy_read,            /* read - general block-dev read */
3613         floppy_write,           /* write - general block-dev write */
3614         NULL,                   /* readdir - bad */
3615         NULL,                   /* select */
3616         fd_ioctl,               /* ioctl */
3617         NULL,                   /* mmap */
3618         floppy_open,            /* open */
3619         floppy_release,         /* release */
3620         block_fsync,            /* fsync */
3621         NULL,                   /* fasync */
3622         check_floppy_change,    /* media_change */
3623         floppy_revalidate,      /* revalidate */
3624 };
3625 
3626 /*
3627  * Floppy Driver initialisation
3628  * =============================
3629  */
3630 
3631 /* Determine the floppy disk controller type */
3632 /* This routine was written by David C. Niemi */
3633 static char get_fdc_version(void)
     /*  */
3634 {
3635         int r;
3636 
3637         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3638         if ( FDCS->reset )
3639                 return FDC_NONE;
3640         if ( (r = result()) <= 0x00)
3641                 return FDC_NONE;        /* No FDC present ??? */
3642         if ((r==1) && (reply_buffer[0] == 0x80)){
3643                 printk("FDC %d is a 8272A\n",fdc);
3644                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3645         }
3646         if (r != 10) {
3647                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3648                 return FDC_UNKNOWN;
3649         }
3650         output_byte(FD_VERSION);
3651         r = result();
3652         if ((r == 1) && (reply_buffer[0] == 0x80)){
3653                 printk("FDC %d is a 82072\n",fdc);
3654                 return FDC_82072;               /* 82072 doesn't know VERSION */
3655         }
3656         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3657                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3658                 return FDC_UNKNOWN;
3659         }
3660         output_byte(FD_UNLOCK);
3661         r = result();
3662         if ((r == 1) && (reply_buffer[0] == 0x80)){
3663                 printk("FDC %d is a pre-1991 82077\n", fdc);
3664                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3665         }
3666         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3667                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3668                 return FDC_UNKNOWN;
3669         }
3670         printk("FDC %d is a post-1991 82077\n",fdc);
3671         return FDC_82077;       /* Revised 82077AA passes all the tests */
3672 } /* get_fdc_version */
3673 
3674 /* lilo configuration */
3675 
3676 /* we make the invert_dcl function global. One day, somebody might
3677 want to centralize all thinkpad related options into one lilo option,
3678 there are just so many thinkpad related quirks! */
3679 void floppy_invert_dcl(int *ints,int param)
     /*  */
3680 {
3681         int i;
3682 
3683         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3684                 if (param)
3685                         default_drive_params[i].params.flags |= 0x80;
3686                 else
3687                         default_drive_params[i].params.flags &= ~0x80;
3688         }
3689         DPRINT("Configuring drives for inverted dcl\n");
3690 }
3691 
3692 static void daring(int *ints,int param)
     /*  */
3693 {
3694         int i;
3695 
3696         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3697                 if (param){
3698                         default_drive_params[i].params.select_delay = 0;
3699                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3700                 } else {
3701                         default_drive_params[i].params.select_delay = 2*HZ/100;
3702                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3703                 }
3704         }
3705         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3706 }
3707 
3708 static void allow_drives(int *ints, int param)
     /*  */
3709 {
3710         ALLOWED_DRIVE_MASK=param;
3711         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3712 }
3713 
3714 static void fdc2_adr(int *ints, int param)
     /*  */
3715 {
3716         FDC2 = param;
3717         if(param)
3718                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3719         else
3720                 DPRINT("disabling second fdc\n");
3721 }
3722 
3723 static void unex(int *ints,int param)
     /*  */
3724 {
3725         print_unex = param;
3726         DPRINT1("%sprinting messages for unexpected interrupts\n",
3727                 param ? "" : "not ");
3728 }
3729 
3730 static void set_cmos(int *ints, int dummy)
     /*  */
3731 {
3732         int current_drive=0;
3733 
3734         if ( ints[0] != 2 ){
3735                 DPRINT("wrong number of parameter for cmos\n");
3736                 return;
3737         }
3738         current_drive = ints[1];
3739         if (current_drive < 0 || current_drive >= 8 ){
3740                 DPRINT("bad drive for set_cmos\n");
3741                 return;
3742         }
3743         if(current_drive >= 4 && !FDC2)
3744                 fdc2_adr(0, 0x370);
3745         if(ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3746                 DPRINT1("bad cmos code %d\n", ints[2]);
3747                 return;
3748         }
3749         DP->cmos = ints[2];
3750         DPRINT1("setting cmos code to %d\n", ints[2]);
3751 }
3752 
3753 static struct param_table {
3754         const char *name;
3755         void (*fn)(int *ints, int param);
3756         int def_param;
3757 } config_params[]={
3758         { "allowed_drive_mask", allow_drives, 0xff },
3759         { "all_drives", allow_drives, 0xff },
3760         { "asus_pci", allow_drives, 0x33 },
3761 
3762         { "daring", daring, 1},
3763 
3764         { "two_fdc", fdc2_adr, 0x370 },
3765         { "one_fdc", fdc2_adr, 0 },
3766 
3767         { "thinkpad", floppy_invert_dcl, 1 },
3768 
3769         { "cmos", set_cmos, 0 },
3770 
3771         { "unexpected_interrupts", unex, 1 },
3772         { "no_unexpected_interrupts", unex, 0 },
3773         { "L40SX", unex, 0 } };
3774 
3775 #define FLOPPY_SETUP
3776 void floppy_setup(char *str, int *ints)
     /*  */
3777 {
3778         int i;
3779         int param;
3780         if(str)
3781                 for(i=0; i< ARRAY_SIZE(config_params); i++){
3782                         if (strcmp(str,config_params[i].name) == 0 ){
3783                                 if (ints[0] )
3784                                         param = ints[1];
3785                                 else
3786                                         param = config_params[i].def_param;
3787                                 config_params[i].fn(ints,param);
3788                                 return;
3789                         }
3790                 }
3791         if(str) {
3792                 DPRINT1("unknown floppy option [%s]\n", str);
3793                 
3794                 DPRINT("allowed options are:");
3795                 for(i=0; i< ARRAY_SIZE(config_params); i++)
3796                         printk(" %s",config_params[i].name);
3797                 printk("\n");
3798         } else
3799                 DPRINT("botched floppy option\n");
3800         DPRINT("Read linux/drivers/block/README.fd\n");
3801 }
3802 
3803 int floppy_init(void)
     /*  */
3804 {
3805         int i,unit,drive;
3806         int have_no_fdc=0;
3807 
3808         raw_cmd = 0;
3809 
3810         sti();
3811 
3812         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3813                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3814                 return -EBUSY;
3815         }
3816 
3817         for(i=0; i<256; i++)
3818                 if (TYPE(i))
3819                         floppy_sizes[i] = floppy_type[TYPE(i)].size >> 1;
3820                 else
3821                         floppy_sizes[i] = MAX_DISK_SIZE;
3822 
3823         blk_size[MAJOR_NR] = floppy_sizes;
3824         blksize_size[MAJOR_NR] = floppy_blocksizes;
3825         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3826         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3827         config_types();
3828 
3829         fdc_state[0].address = FDC1;
3830         fdc_state[0].dor = 0;
3831 #if N_FDC > 1
3832         fdc_state[1].address = FDC2;
3833         fdc_state[1].dor = 0;
3834 #endif
3835 
3836         for (i = 0 ; i < N_FDC ; i++) {
3837                 fdc = i;
3838                 FDCS->dtr = -1;
3839                 FDCS->dor = 0x4;
3840                 FDCS->reset = 0;
3841                 FDCS->version = FDC_NONE;
3842         }
3843 
3844         if(floppy_grab_irq_and_dma()){
3845                 unregister_blkdev(MAJOR_NR,"fd");
3846                 return -EBUSY;
3847         }
3848 
3849         /* initialise drive state */
3850         for (drive = 0; drive < N_DRIVE ; drive++) {
3851                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3852                 UDRS->generation = 0;
3853                 UDRS->keep_data = 0;
3854                 UDRS->fd_ref = 0;
3855                 UDRS->fd_device = 0;
3856                 floppy_track_buffer = NULL;
3857                 max_buffer_sectors = 0;
3858                 UDRWE->write_errors = 0;
3859                 UDRWE->first_error_sector = 0;
3860                 UDRWE->first_error_generation = 0;
3861                 UDRWE->last_error_sector = 0;
3862                 UDRWE->last_error_generation = 0;
3863                 UDRWE->badness = 0;
3864         }
3865 
3866         for (i = 0 ; i < N_FDC ; i++) {
3867                 fdc = i;
3868                 FDCS->driver_version = FD_DRIVER_VERSION;
3869                 for(unit=0; unit<4; unit++)
3870                         FDCS->track[unit] = 0;
3871                 if (FDCS->address == -1 )
3872                         continue;
3873                 FDCS->rawcmd = 2;
3874                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3875                         FDCS->address = -1;
3876                         continue;
3877                 }
3878                 /* Try to determine the floppy controller type */
3879                 FDCS->version = get_fdc_version();
3880                 if (FDCS->version == FDC_NONE){
3881                         FDCS->address = -1;
3882                         continue;
3883                 }
3884 
3885                 request_region(FDCS->address, 6, "floppy");
3886                 request_region(FDCS->address+7, 1, "floppy DIR");
3887                 /* address + 6 is reserved, and may be taken by IDE.
3888                  * Unfortunately, Adaptec doesn't know this :-(, */
3889 
3890                 have_no_fdc = 0;
3891                 /* Not all FDCs seem to be able to handle the version command
3892                  * properly, so force a reset for the standard FDC clones,
3893                  * to avoid interrupt garbage.
3894                  */
3895                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3896                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3897         }
3898         fdc=0;
3899         del_timer(&fd_timeout);
3900         current_drive = 0;
3901         floppy_release_irq_and_dma();
3902         initialising=0;
3903         if(have_no_fdc)
3904                 unregister_blkdev(MAJOR_NR,"fd");
3905         else
3906                 virtual_dma_init();
3907         return have_no_fdc;
3908 }
3909 
3910 static int floppy_grab_irq_and_dma(void)
     /*  */
3911 {
3912         int i;
3913         cli();
3914         if (usage_count++){
3915                 sti();
3916                 return 0;
3917         }
3918         sti();
3919 #ifdef FD_MODULE
3920         MOD_INC_USE_COUNT;
3921 #endif
3922         for(i=0; i< N_FDC; i++){
3923                 if(FDCS->address != -1){
3924                         fdc = i;
3925                         reset_fdc_info(1);
3926                         fd_outb(FDCS->dor, FD_DOR);
3927                 }
3928         }
3929         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3930 
3931         if (fd_request_irq()) {
3932                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3933                         FLOPPY_IRQ);
3934                 return -1;
3935         }
3936         if (fd_request_dma()) {
3937                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3938                         FLOPPY_DMA);
3939                 fd_free_irq();
3940                 return -1;
3941         }
3942         for(fdc = 0; fdc < N_FDC ; fdc++)
3943                 if(FDCS->address != -1)
3944                         fd_outb(FDCS->dor, FD_DOR);
3945         fdc = 0;
3946         fd_enable_irq();
3947         return 0;
3948 }
3949 
3950 static void floppy_release_irq_and_dma(void)
     /*  */
3951 {
3952 #ifdef CONFIG_FLOPPY_SANITY
3953         int drive;
3954 #endif
3955         long tmpsize;
3956         void *tmpaddr;
3957 
3958         cli();
3959         if (--usage_count){
3960                 sti();
3961                 return;
3962         }
3963         sti();
3964 #ifdef FD_MODULE
3965         MOD_DEC_USE_COUNT;
3966 #endif
3967         fd_disable_dma();
3968         fd_free_dma();
3969         fd_disable_irq();
3970         fd_free_irq();
3971 
3972         set_dor(0, ~0, 8);
3973 #if N_FDC > 1
3974         set_dor(1, ~8, 0);
3975 #endif
3976         floppy_enable_hlt();
3977 
3978         if (floppy_track_buffer && max_buffer_sectors) {
3979                 tmpsize = max_buffer_sectors*1024;
3980                 tmpaddr = (void *)floppy_track_buffer;
3981                 floppy_track_buffer = 0;
3982                 max_buffer_sectors = 0;
3983                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
3984         }
3985 
3986 #ifdef CONFIG_FLOPPY_SANITY
3987         for(drive=0; drive < N_FDC * 4; drive++)
3988                 if( motor_off_timer[drive].next )
3989                         printk("motor off timer %d still active\n", drive);
3990 
3991         if(fd_timeout.next)
3992                 printk("floppy timer still active:%s\n", timeout_message);
3993         if (fd_timer.next)
3994                 printk("auxiliary floppy timer still active\n");
3995         if(floppy_tq.sync)
3996                 printk("task queue still active\n");
3997 #endif
3998 }
3999 
4000 
4001 #ifdef MODULE
4002 
4003 extern char *get_options(char *str, int *ints);
4004 
4005 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /*  */
4006 {
4007         int i;
4008         char c;
4009         int j;
4010         int match;
4011         char buffer[100];
4012         int ints[11];
4013         int length = strlen(pattern)+1;
4014 
4015         match=0;
4016         j=1;
4017 
4018         for(i=current->mm->env_start; i< current->mm->env_end; i ++){
4019                 c= get_fs_byte(i);
4020                 if(match){
4021                         if(j==99)
4022                                 c='\0';
4023                         buffer[j] = c;
4024                         if(!c || c == ' ' || c == '\t'){
4025                                 if(j){
4026                                         buffer[j] = '\0';
4027                                         setup(get_options(buffer,ints),ints);
4028                                 }
4029                                 j=0;
4030                         } else
4031                                 j++;
4032                         if(!c)
4033                                 break;
4034                         continue;
4035                 }
4036                 if( (!j && !c) || ( j && c == pattern[j-1]))
4037                         j++;
4038                 else
4039                         j=0;
4040                 if(j==length){
4041                         match=1;
4042                         j=0;
4043                 }
4044         }
4045 }
4046 
4047 
4048 #ifdef __cplusplus
4049 extern "C" {
4050 #endif
4051 int init_module(void)
     /*  */
4052 {
4053         int ret;
4054         printk("inserting floppy driver for %s\n", kernel_version);
4055                 
4056         mod_setup("floppy=", floppy_setup);
4057                 
4058         ret = floppy_init();
4059                 return 0;
4060 }
4061 
4062 void cleanup_module(void)
     /*  */
4063 {
4064         int fdc;
4065                 
4066         for(fdc=0; fdc<2; fdc++)
4067                 if (FDCS->address != -1){
4068                         release_region(FDCS->address, 6);
4069                         release_region(FDCS->address+7, 1);
4070         }
4071                 
4072         unregister_blkdev(MAJOR_NR, "fd");
4073 
4074         blk_dev[MAJOR_NR].request_fn = 0;
4075 }
4076 
4077 #ifdef __cplusplus
4078 }
4079 #endif
4080 
4081 #endif
/* */
root/drivers/block/floppy.c

DEFINITIONS
