drivers/block/floppy.c

/* */
This source file includes following definitions.
__get_order
dma_mem_alloc
TYPE
DRIVE
set_debugt
debugt
is_alive
reschedule_timeout
maximum
minimum
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
wait_til_ready
output_byte
result
need_more_output
perpendicular_mode
fdc_configure
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
clear_write_error
set_geometry
normalize_0x02xx_ioctl
xlate_0x00xx_ioctl
fd_ioctl
config_types
floppy_read
floppy_write
floppy_release
floppy_open
check_floppy_change
floppy_revalidate
get_fdc_version
floppy_invert_dcl
daring
set_cmos
floppy_setup
floppy_init
floppy_grab_irq_and_dma
floppy_release_irq_and_dma
parse_floppy_cfg_string
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 /* 1995/4/24 -- Dan Fandrich -- added support for Commodore 1581 3.5" disks
  85  * by defining bit 1 of the "stretch" parameter to mean put sectors on the
  86  * opposite side of the disk, leaving the sector IDs alone (i.e. Commodore's
  87  * drives are "upside-down").
  88  */
  89 
  90 /*
  91  * 1995/8/26 -- Andreas Busse -- added Mips support.
  92  */
  93 
  94 /*
  95  * 1995/10/18 -- Ralf Baechle -- Portability cleanup; move machine dependent
  96  * features to asm/floppy.h.
  97  */
  98 
  99 
 100 #define FLOPPY_SANITY_CHECK
 101 #undef  FLOPPY_SILENT_DCL_CLEAR
 102 
 103 #define REALLY_SLOW_IO
 104 
 105 #define DEBUGT 2
 106 #define DCL_DEBUG /* debug disk change line */
 107 
 108 /* do print messages for unexpected interrupts */
 109 static int print_unex=1;
 110 #include <linux/utsname.h>
 111 #include <linux/module.h>
 112 
 113 /* the following is the mask of allowed drives. By default units 2 and
 114  * 3 of both floppy controllers are disabled, because switching on the
 115  * motor of these drives causes system hangs on some PCI computers. drive
 116  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 117  * a drive is allowed. */
 118 static int FLOPPY_IRQ=6;
 119 static int FLOPPY_DMA=2;
 120 static int allowed_drive_mask = 0x33;
 121  
 122 
 123 #include <linux/sched.h>
 124 #include <linux/fs.h>
 125 #include <linux/kernel.h>
 126 #include <linux/timer.h>
 127 #include <linux/tqueue.h>
 128 #define FDPATCHES
 129 #include <linux/fdreg.h>
 130 
 131 
 132 #include <linux/fd.h>
 133 
 134 
 135 #define OLDFDRAWCMD 0x020d /* send a raw command to the fdc */
 136 
 137 struct old_floppy_raw_cmd {
 138   void *data;
 139   long length;
 140 
 141   unsigned char rate;
 142   unsigned char flags;
 143   unsigned char cmd_count;
 144   unsigned char cmd[9];
 145   unsigned char reply_count;
 146   unsigned char reply[7];
 147   int track;
 148 };
 149 
 150 #include <linux/errno.h>
 151 #include <linux/malloc.h>
 152 #include <linux/mm.h>
 153 #include <linux/string.h>
 154 #include <linux/fcntl.h>
 155 #include <linux/delay.h>
 156 #include <linux/mc146818rtc.h> /* CMOS defines */
 157 #include <linux/ioport.h>
 158 
 159 #include <asm/dma.h>
 160 #include <asm/irq.h>
 161 #include <asm/system.h>
 162 #include <asm/io.h>
 163 #include <asm/segment.h>
 164 
 165 static int use_virtual_dma=0; /* virtual DMA for Intel */
 166 static unsigned short virtual_dma_port=0x3f0;
 167 static void floppy_interrupt(int irq, void *dev_id, struct pt_regs * regs);
 168 static int set_dor(int fdc, char mask, char data);
 169 #include <asm/floppy.h>
 170 
 171 
 172 #define MAJOR_NR FLOPPY_MAJOR
 173 
 174 #include <linux/blk.h>
 175 #include <linux/cdrom.h> /* for the compatibility eject ioctl */
 176 
 177 
 178 #ifndef FLOPPY_MOTOR_MASK
 179 #define FLOPPY_MOTOR_MASK 0xf0
 180 #endif
 181 
 182 #ifndef fd_eject
 183 #define fd_eject(x) -EINVAL
 184 #endif
 185 
 186 #ifndef fd_get_dma_residue
 187 #define fd_get_dma_residue() get_dma_residue(FLOPPY_DMA)
 188 #endif
 189 
 190 /* Dma Memory related stuff */
 191 
 192 /* Pure 2^n version of get_order */
 193 static inline int __get_order(unsigned long size)
     /*  */
 194 {
 195         int order;
 196 
 197         size = (size-1) >> (PAGE_SHIFT-1);
 198         order = -1;
 199         do {
 200                 size >>= 1;
 201                 order++;
 202         } while (size);
 203         return order;
 204 }
 205 
 206 static unsigned long dma_mem_alloc(int size)
     /*  */
 207 {
 208         int order = __get_order(size);
 209 
 210         return __get_dma_pages(GFP_KERNEL,order);
 211 }
 212 
 213 /* End dma memory related stuff */
 214 
 215 static unsigned int fake_change = 0;
 216 static int initialising=1;
 217 
 218 #ifdef __sparc__
 219 /* We hold the FIFO configuration here.  We want to have Polling and
 220  * Implied Seek enabled on Sun controllers.
 221  */
 222 unsigned char fdc_cfg = 0;
 223 #endif
 224 
 225 static inline int TYPE(kdev_t x) {
     /*  */
 226         return  (MINOR(x)>>2) & 0x1f;
 227 }
 228 static inline int DRIVE(kdev_t x) {
     /*  */
 229         return (MINOR(x)&0x03) | ((MINOR(x)&0x80) >> 5);
 230 }
 231 #define ITYPE(x) (((x)>>2) & 0x1f)
 232 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 233 #define UNIT(x) ((x) & 0x03)            /* drive on fdc */
 234 #define FDC(x) (((x) & 0x04) >> 2)  /* fdc of drive */
 235 #define REVDRIVE(fdc, unit) ((unit) + ((fdc) << 2))
 236                                 /* reverse mapping from unit and fdc to drive */
 237 #define DP (&drive_params[current_drive])
 238 #define DRS (&drive_state[current_drive])
 239 #define DRWE (&write_errors[current_drive])
 240 #define FDCS (&fdc_state[fdc])
 241 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 242 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 243 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 244 
 245 #define UDP (&drive_params[drive])
 246 #define UDRS (&drive_state[drive])
 247 #define UDRWE (&write_errors[drive])
 248 #define UFDCS (&fdc_state[FDC(drive)])
 249 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 250 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 251 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 252 
 253 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 254 
 255 #define DPRINT1(x,x1) printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 256 
 257 #define DPRINT2(x,x1,x2) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 258 
 259 #define DPRINT3(x,x1,x2,x3) printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 260 
 261 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 262 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 263 
 264 #define CLEARSTRUCT(x) memset((x), 0, sizeof(*(x)))
 265 
 266 /* read/write */
 267 #define COMMAND raw_cmd->cmd[0]
 268 #define DR_SELECT raw_cmd->cmd[1]
 269 #define TRACK raw_cmd->cmd[2]
 270 #define HEAD raw_cmd->cmd[3]
 271 #define SECTOR raw_cmd->cmd[4]
 272 #define SIZECODE raw_cmd->cmd[5]
 273 #define SECT_PER_TRACK raw_cmd->cmd[6]
 274 #define GAP raw_cmd->cmd[7]
 275 #define SIZECODE2 raw_cmd->cmd[8]
 276 #define NR_RW 9
 277 
 278 /* format */
 279 #define F_SIZECODE raw_cmd->cmd[2]
 280 #define F_SECT_PER_TRACK raw_cmd->cmd[3]
 281 #define F_GAP raw_cmd->cmd[4]
 282 #define F_FILL raw_cmd->cmd[5]
 283 #define NR_F 6
 284 
 285 /*
 286  * Maximum disk size (in kilobytes). This default is used whenever the
 287  * current disk size is unknown.
 288  * [Now it is rather a minimum]
 289  */
 290 #define MAX_DISK_SIZE 2 /* 3984*/
 291 
 292 #define K_64    0x10000         /* 64KB */
 293 
 294 /*
 295  * globals used by 'result()'
 296  */
 297 #define MAX_REPLIES 17
 298 static unsigned char reply_buffer[MAX_REPLIES];
 299 static int inr; /* size of reply buffer, when called from interrupt */
 300 #define ST0 (reply_buffer[0])
 301 #define ST1 (reply_buffer[1])
 302 #define ST2 (reply_buffer[2])
 303 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 304 #define R_TRACK (reply_buffer[3])
 305 #define R_HEAD (reply_buffer[4])
 306 #define R_SECTOR (reply_buffer[5])
 307 #define R_SIZECODE (reply_buffer[6])
 308 
 309 #define SEL_DLY (2*HZ/100)
 310 
 311 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 312 /*
 313  * this struct defines the different floppy drive types.
 314  */
 315 static struct {
 316         struct floppy_drive_params params;
 317         const char *name; /* name printed while booting */
 318 } default_drive_params[]= {
 319 /* NOTE: the time values in jiffies should be in msec!
 320  CMOS drive type
 321   |     Maximum data rate supported by drive type
 322   |     |   Head load time, msec
 323   |     |   |   Head unload time, msec (not used)
 324   |     |   |   |     Step rate interval, usec
 325   |     |   |   |     |       Time needed for spinup time (jiffies)
 326   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 327   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 328   |     |   |   |     |       |      |   |     Select delay
 329   |     |   |   |     |       |      |   |     |     RPS
 330   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 331   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 332   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 333   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 334 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 335       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 336 
 337 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 338       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 339 
 340 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 341       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 342 
 343 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 344       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 345 
 346 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 347       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 348 
 349 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 350       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 351 
 352 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 353       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 354 /*    |  --autodetected formats---    |      |      |
 355  *    read_track                      |      |    Name printed when booting
 356  *                                    |     Native format
 357  *                  Frequency of disk change checks */
 358 };
 359 
 360 static struct floppy_drive_params drive_params[N_DRIVE];
 361 static struct floppy_drive_struct drive_state[N_DRIVE];
 362 static struct floppy_write_errors write_errors[N_DRIVE];
 363 static struct floppy_raw_cmd *raw_cmd, default_raw_cmd;
 364 
 365 /*
 366  * This struct defines the different floppy types.
 367  *
 368  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 369  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 370  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 371  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 372  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 373  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 374  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 375  * 'stretch' should probably be renamed to something more general, like
 376  * 'options'.  Other parameters should be self-explanatory (see also
 377  * setfdprm(8)).
 378  */
 379 static struct floppy_struct floppy_type[32] = {
 380         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 381         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 382         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 383         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 384         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 385         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 386         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 387         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 388         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 389         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 390 
 391         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 392         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 393         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 394         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 395         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 396         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 397         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 398         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 399         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 400         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 401 
 402         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 403         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 404         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 405         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 406         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 407         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 408         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 409         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 410         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 411 
 412         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 413         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 414         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 415 };
 416 
 417 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 418 #define SECTSIZE (_FD_SECTSIZE(*floppy))
 419 
 420 /* Auto-detection: Disk type used until the next media change occurs. */
 421 static struct floppy_struct *current_type[N_DRIVE] = {
 422         NULL, NULL, NULL, NULL,
 423         NULL, NULL, NULL, NULL
 424 };
 425 
 426 /*
 427  * User-provided type information. current_type points to
 428  * the respective entry of this array.
 429  */
 430 static struct floppy_struct user_params[N_DRIVE];
 431 
 432 static int floppy_sizes[256];
 433 static int floppy_blocksizes[256] = { 0, };
 434 
 435 /*
 436  * The driver is trying to determine the correct media format
 437  * while probing is set. rw_interrupt() clears it after a
 438  * successful access.
 439  */
 440 static int probing = 0;
 441 
 442 /* Synchronization of FDC access. */
 443 #define FD_COMMAND_NONE -1
 444 #define FD_COMMAND_ERROR 2
 445 #define FD_COMMAND_OKAY 3
 446 
 447 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 448 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 449 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 450 #define CALL(x) if ((x) == -EINTR) return -EINTR
 451 #define ECALL(x) if ((ret = (x))) return ret;
 452 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 453 #define WAIT(x) _WAIT((x),interruptible)
 454 #define IWAIT(x) _WAIT((x),1)
 455 
 456 /* Errors during formatting are counted here. */
 457 static int format_errors;
 458 
 459 /* Format request descriptor. */
 460 static struct format_descr format_req;
 461 
 462 /*
 463  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 464  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 465  * H is head unload time (1=16ms, 2=32ms, etc)
 466  */
 467 
 468 /*
 469  * Track buffer
 470  * Because these are written to by the DMA controller, they must
 471  * not contain a 64k byte boundary crossing, or data will be
 472  * corrupted/lost.
 473  */
 474 static char *floppy_track_buffer=0;
 475 static int max_buffer_sectors=0;
 476 
 477 static int *errors;
 478 typedef void (*done_f)(int);
 479 static struct cont_t {
 480         void (*interrupt)(void); /* this is called after the interrupt of the
 481                                   * main command */
 482         void (*redo)(void); /* this is called to retry the operation */
 483         void (*error)(void); /* this is called to tally an error */
 484         done_f done; /* this is called to say if the operation has 
 485                       * succeeded/failed */
 486 } *cont=NULL;
 487 
 488 static void floppy_ready(void);
 489 static void floppy_start(void);
 490 static void process_fd_request(void);
 491 static void recalibrate_floppy(void);
 492 static void floppy_shutdown(unsigned long);
 493 
 494 static int floppy_grab_irq_and_dma(void);
 495 static void floppy_release_irq_and_dma(void);
 496 
 497 /*
 498  * The "reset" variable should be tested whenever an interrupt is scheduled,
 499  * after the commands have been sent. This is to ensure that the driver doesn't
 500  * get wedged when the interrupt doesn't come because of a failed command.
 501  * reset doesn't need to be tested before sending commands, because
 502  * output_byte is automatically disabled when reset is set.
 503  */
 504 #define CHECK_RESET { if (FDCS->reset){ reset_fdc(); return; } }
 505 static void reset_fdc(void);
 506 
 507 /*
 508  * These are global variables, as that's the easiest way to give
 509  * information to interrupts. They are the data used for the current
 510  * request.
 511  */
 512 #define NO_TRACK -1
 513 #define NEED_1_RECAL -2
 514 #define NEED_2_RECAL -3
 515 
 516 /* */
 517 static int usage_count = 0;
 518 
 519 
 520 /* buffer related variables */
 521 static int buffer_track = -1;
 522 static int buffer_drive = -1;
 523 static int buffer_min = -1;
 524 static int buffer_max = -1;
 525 
 526 /* fdc related variables, should end up in a struct */
 527 static struct floppy_fdc_state fdc_state[N_FDC];
 528 static int fdc; /* current fdc */
 529 
 530 static struct floppy_struct *_floppy = floppy_type;
 531 static unsigned char current_drive = 0;
 532 static long current_count_sectors = 0;
 533 static unsigned char sector_t; /* sector in track */
 534 
 535 #ifdef DEBUGT
 536 static long unsigned debugtimer;
 537 #endif
 538 
 539 /*
 540  * Debugging
 541  * =========
 542  */
 543 static inline void set_debugt(void)
     /*  */
 544 {
 545 #ifdef DEBUGT
 546         debugtimer = jiffies;
 547 #endif
 548 }
 549 
 550 static inline void debugt(const char *message)
     /*  */
 551 {
 552 #ifdef DEBUGT
 553         if (DP->flags & DEBUGT)
 554                 printk("%s dtime=%lu\n", message, jiffies-debugtimer);
 555 #endif
 556 }
 557 
 558 typedef void (*timeout_fn)(unsigned long);
 559 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0,
 560                                        (timeout_fn) floppy_shutdown };
 561 
 562 static const char *timeout_message;
 563 
 564 #ifdef FLOPPY_SANITY_CHECK
 565 static void is_alive(const char *message)
     /*  */
 566 {
 567         /* this routine checks whether the floppy driver is "alive" */
 568         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 569                 DPRINT1("timeout handler died: %s\n",message);
 570         }
 571 }
 572 #endif
 573 
 574 #ifdef FLOPPY_SANITY_CHECK
 575 
 576 #define OLOGSIZE 20
 577 
 578 static void (*lasthandler)(void) = NULL;
 579 static int interruptjiffies=0;
 580 static int resultjiffies=0;
 581 static int resultsize=0;
 582 static int lastredo=0;
 583 
 584 static struct output_log {
 585         unsigned char data;
 586         unsigned char status;
 587         unsigned long jiffies;
 588 } output_log[OLOGSIZE];
 589 
 590 static int output_log_pos=0;
 591 #endif
 592 
 593 #define CURRENTD -1
 594 #define MAXTIMEOUT -2
 595 
 596 static void reschedule_timeout(int drive, const char *message, int marg)
     /*  */
 597 {
 598         if (drive == CURRENTD)
 599                 drive = current_drive;
 600         del_timer(&fd_timeout);
 601         if (drive < 0 || drive > N_DRIVE) {
 602                 fd_timeout.expires = jiffies + 20*HZ;
 603                 drive=0;
 604         } else
 605                 fd_timeout.expires = jiffies + UDP->timeout;
 606         add_timer(&fd_timeout);
 607         if (UDP->flags & FD_DEBUG){
 608                 DPRINT("reschedule timeout ");
 609                 printk(message, marg);
 610                 printk("\n");
 611         }
 612         timeout_message = message;
 613 }
 614 
 615 static int maximum(int a, int b)
     /*  */
 616 {
 617         if(a > b)
 618                 return a;
 619         else
 620                 return b;
 621 }
 622 #define INFBOUND(a,b) (a)=maximum((a),(b));
 623 
 624 static int minimum(int a, int b)
     /*  */
 625 {
 626         if(a < b)
 627                 return a;
 628         else
 629                 return b;
 630 }
 631 #define SUPBOUND(a,b) (a)=minimum((a),(b));
 632 
 633 
 634 /*
 635  * Bottom half floppy driver.
 636  * ==========================
 637  *
 638  * This part of the file contains the code talking directly to the hardware,
 639  * and also the main service loop (seek-configure-spinup-command)
 640  */
 641 
 642 /*
 643  * disk change.
 644  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 645  * and the last_checked date.
 646  *
 647  * last_checked is the date of the last check which showed 'no disk change'
 648  * FD_DISK_CHANGE is set under two conditions:
 649  * 1. The floppy has been changed after some i/o to that floppy already
 650  *    took place.
 651  * 2. No floppy disk is in the drive. This is done in order to ensure that
 652  *    requests are quickly flushed in case there is no disk in the drive. It
 653  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 654  *    the drive.
 655  *
 656  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 657  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 658  *  each seek. If a disk is present, the disk change line should also be
 659  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 660  *  change line is set, this means either that no disk is in the drive, or
 661  *  that it has been removed since the last seek.
 662  *
 663  * This means that we really have a third possibility too:
 664  *  The floppy has been changed after the last seek.
 665  */
 666 
 667 static int disk_change(int drive)
     /*  */
 668 {
 669         int fdc=FDC(drive);
 670 #ifdef FLOPPY_SANITY_CHECK
 671         if (jiffies < UDP->select_delay + UDRS->select_date)
 672                 DPRINT("WARNING disk change called early\n");
 673         if (!(FDCS->dor & (0x10 << UNIT(drive))) ||
 674            (FDCS->dor & 3) != UNIT(drive) ||
 675            fdc != FDC(drive)){
 676                 DPRINT("probing disk change on unselected drive\n");
 677                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 678                         FDCS->dor);
 679         }
 680 #endif
 681 
 682 #ifdef DCL_DEBUG
 683         if (UDP->flags & FD_DEBUG){
 684                 DPRINT1("checking disk change line for drive %d\n",drive);
 685                 DPRINT1("jiffies=%ld\n", jiffies);
 686                 DPRINT1("disk change line=%x\n",fd_inb(FD_DIR)&0x80);
 687                 DPRINT1("flags=%x\n",UDRS->flags);
 688         }
 689 #endif
 690         if (UDP->flags & FD_BROKEN_DCL)
 691                 return UTESTF(FD_DISK_CHANGED);
 692         if ((fd_inb(FD_DIR) ^ UDP->flags) & 0x80){
 693                 USETF(FD_VERIFY); /* verify write protection */
 694                 if (UDRS->maxblock){
 695                         /* mark it changed */
 696                         USETF(FD_DISK_CHANGED);
 697 
 698                         /* invalidate its geometry */
 699                         if (UDRS->keep_data >= 0) {
 700                                 if ((UDP->flags & FTD_MSG) &&
 701                                     current_type[drive] != NULL)
 702                                         DPRINT("Disk type is undefined after "
 703                                                "disk change\n");
 704                                 current_type[drive] = NULL;
 705                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 706                         }
 707                 }
 708                 /*USETF(FD_DISK_NEWCHANGE);*/
 709                 return 1;
 710         } else {
 711                 UDRS->last_checked=jiffies;
 712                 UCLEARF(FD_DISK_NEWCHANGE);
 713         }
 714         return 0;
 715 }
 716 
 717 static inline int is_selected(int dor, int unit)
     /*  */
 718 {
 719         return ((dor  & (0x10 << unit)) && (dor &3) == unit);
 720 }
 721 
 722 static int set_dor(int fdc, char mask, char data)
     /*  */
 723 {
 724         register unsigned char drive, unit, newdor,olddor;
 725 
 726         if (FDCS->address == -1)
 727                 return -1;
 728 
 729         olddor = FDCS->dor;
 730         newdor =  (olddor & mask) | data;
 731         if (newdor != olddor){
 732                 unit = olddor & 0x3;
 733                 if (is_selected(olddor, unit) && !is_selected(newdor,unit)){
 734                         drive = REVDRIVE(fdc,unit);
 735 #ifdef DCL_DEBUG
 736                         if (UDP->flags & FD_DEBUG){
 737                                 DPRINT("calling disk change from set_dor\n");
 738                         }
 739 #endif
 740                         disk_change(drive);
 741                 }
 742                 FDCS->dor = newdor;
 743                 fd_outb(newdor, FD_DOR);
 744 
 745                 unit = newdor & 0x3;
 746                 if (!is_selected(olddor, unit) && is_selected(newdor,unit)){
 747                         drive = REVDRIVE(fdc,unit);
 748                         UDRS->select_date = jiffies;
 749                 }
 750         }
 751         if (newdor & FLOPPY_MOTOR_MASK)
 752                 floppy_grab_irq_and_dma();
 753         if (olddor & FLOPPY_MOTOR_MASK)
 754                 floppy_release_irq_and_dma();
 755         return olddor;
 756 }
 757 
 758 static void twaddle(void)
     /*  */
 759 {
 760         if (DP->select_delay)
 761                 return;
 762         fd_outb(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 763         fd_outb(FDCS->dor, FD_DOR);
 764         DRS->select_date = jiffies;
 765 }
 766 
 767 /* reset all driver information about the current fdc. This is needed after
 768  * a reset, and after a raw command. */
 769 static void reset_fdc_info(int mode)
     /*  */
 770 {
 771         int drive;
 772 
 773         FDCS->spec1 = FDCS->spec2 = -1;
 774         FDCS->need_configure = 1;
 775         FDCS->perp_mode = 1;
 776         FDCS->rawcmd = 0;
 777         for (drive = 0; drive < N_DRIVE; drive++)
 778                 if (FDC(drive) == fdc &&
 779                     (mode || UDRS->track != NEED_1_RECAL))
 780                         UDRS->track = NEED_2_RECAL;
 781 }
 782 
 783 /* selects the fdc and drive, and enables the fdc's input/dma. */
 784 static void set_fdc(int drive)
     /*  */
 785 {
 786         if (drive >= 0 && drive < N_DRIVE){
 787                 fdc = FDC(drive);
 788                 current_drive = drive;
 789         }
 790         if (fdc != 1 && fdc != 0) {
 791                 printk("bad fdc value\n");
 792                 return;
 793         }
 794         set_dor(fdc,~0,8);
 795 #if N_FDC > 1
 796         set_dor(1-fdc, ~8, 0);
 797 #endif
 798         if (FDCS->rawcmd == 2)
 799                 reset_fdc_info(1);
 800         if (fd_inb(FD_STATUS) != STATUS_READY)
 801                 FDCS->reset = 1;
 802 }
 803 
 804 /* locks the driver */
 805 static int lock_fdc(int drive, int interruptible)
     /*  */
 806 {
 807         if (!usage_count){
 808                 printk("trying to lock fdc while usage count=0\n");
 809                 return -1;
 810         }
 811         floppy_grab_irq_and_dma();
 812         cli();
 813         while (fdc_busy && NO_SIGNAL)
 814                 interruptible_sleep_on(&fdc_wait);
 815         if (fdc_busy){
 816                 sti();
 817                 return -EINTR;
 818         }
 819         fdc_busy = 1;
 820         sti();
 821         command_status = FD_COMMAND_NONE;
 822         reschedule_timeout(drive, "lock fdc", 0);
 823         set_fdc(drive);
 824         return 0;
 825 }
 826 
 827 #define LOCK_FDC(drive,interruptible) \
 828 if (lock_fdc(drive,interruptible)) return -EINTR;
 829 
 830 
 831 /* unlocks the driver */
 832 static inline void unlock_fdc(void)
     /*  */
 833 {
 834         raw_cmd = 0;
 835         if (!fdc_busy)
 836                 DPRINT("FDC access conflict!\n");
 837 
 838         if (DEVICE_INTR)
 839                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 840                         DEVICE_INTR);
 841         command_status = FD_COMMAND_NONE;
 842         del_timer(&fd_timeout);
 843         cont = NULL;
 844         fdc_busy = 0;
 845         floppy_release_irq_and_dma();
 846         wake_up(&fdc_wait);
 847 }
 848 
 849 /* switches the motor off after a given timeout */
 850 static void motor_off_callback(unsigned long nr)
     /*  */
 851 {
 852         unsigned char mask = ~(0x10 << UNIT(nr));
 853 
 854         set_dor(FDC(nr), mask, 0);
 855 }
 856 
 857 static struct timer_list motor_off_timer[N_DRIVE] = {
 858         { NULL, NULL, 0, 0, motor_off_callback },
 859         { NULL, NULL, 0, 1, motor_off_callback },
 860         { NULL, NULL, 0, 2, motor_off_callback },
 861         { NULL, NULL, 0, 3, motor_off_callback },
 862         { NULL, NULL, 0, 4, motor_off_callback },
 863         { NULL, NULL, 0, 5, motor_off_callback },
 864         { NULL, NULL, 0, 6, motor_off_callback },
 865         { NULL, NULL, 0, 7, motor_off_callback }
 866 };
 867 
 868 /* schedules motor off */
 869 static void floppy_off(unsigned int drive)
     /*  */
 870 {
 871         unsigned long volatile delta;
 872         register int fdc=FDC(drive);
 873 
 874         if (!(FDCS->dor & (0x10 << UNIT(drive))))
 875                 return;
 876 
 877         del_timer(motor_off_timer+drive);
 878 
 879         /* make spindle stop in a position which minimizes spinup time
 880          * next time */
 881         if (UDP->rps){
 882                 delta = jiffies - UDRS->first_read_date + HZ -
 883                         UDP->spindown_offset;
 884                 delta = ((delta * UDP->rps) % HZ) / UDP->rps;
 885                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 886         }
 887         add_timer(motor_off_timer+drive);
 888 }
 889 
 890 /*
 891  * cycle through all N_DRIVE floppy drives, for disk change testing.
 892  * stopping at current drive. This is done before any long operation, to
 893  * be sure to have up to date disk change information.
 894  */
 895 static void scandrives(void)
     /*  */
 896 {
 897         int i, drive, saved_drive;
 898 
 899         if (DP->select_delay)
 900                 return;
 901 
 902         saved_drive = current_drive;
 903         for (i=0; i < N_DRIVE; i++){
 904                 drive = (saved_drive + i + 1) % N_DRIVE;
 905                 if (UDRS->fd_ref == 0 || UDP->select_delay != 0)
 906                         continue; /* skip closed drives */
 907                 set_fdc(drive);
 908                 if (!(set_dor(fdc, ~3, UNIT(drive) | (0x10 << UNIT(drive))) &
 909                       (0x10 << UNIT(drive))))
 910                         /* switch the motor off again, if it was off to
 911                          * begin with */
 912                         set_dor(fdc, ~(0x10 << UNIT(drive)), 0);
 913         }
 914         set_fdc(saved_drive);
 915 }
 916 
 917 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 918 
 919 /* this function makes sure that the disk stays in the drive during the
 920  * transfer */
 921 static void fd_watchdog(void)
     /*  */
 922 {
 923 #ifdef DCL_DEBUG
 924         if (DP->flags & FD_DEBUG){
 925                 DPRINT("calling disk change from watchdog\n");
 926         }
 927 #endif
 928 
 929         if (disk_change(current_drive)){
 930                 DPRINT("disk removed during i/o\n");
 931                 floppy_shutdown(1);
 932         } else {
 933                 del_timer(&fd_timer);
 934                 fd_timer.function = (timeout_fn) fd_watchdog;
 935                 fd_timer.expires = jiffies + HZ / 10;
 936                 add_timer(&fd_timer);
 937         }
 938 }
 939 
 940 static void main_command_interrupt(void)
     /*  */
 941 {
 942         del_timer(&fd_timer);
 943         cont->interrupt();
 944 }
 945 
 946 /* waits for a delay (spinup or select) to pass */
 947 static int wait_for_completion(int delay, timeout_fn function)
     /*  */
 948 {
 949         if (FDCS->reset){
 950                 reset_fdc(); /* do the reset during sleep to win time
 951                               * if we don't need to sleep, it's a good
 952                               * occasion anyways */
 953                 return 1;
 954         }
 955 
 956         if (jiffies < delay){
 957                 del_timer(&fd_timer);
 958                 fd_timer.function = function;
 959                 fd_timer.expires = delay;
 960                 add_timer(&fd_timer);
 961                 return 1;
 962         }
 963         return 0;
 964 }
 965 
 966 static int hlt_disabled=0;
 967 static void floppy_disable_hlt(void)
     /*  */
 968 {
 969         unsigned long flags;
 970         save_flags(flags);
 971         cli();
 972         if (!hlt_disabled){
 973                 hlt_disabled=1;
 974 #ifdef HAVE_DISABLE_HLT
 975                 disable_hlt();
 976 #endif
 977         }
 978         restore_flags(flags);
 979 }
 980 
 981 static void floppy_enable_hlt(void)
     /*  */
 982 {
 983         unsigned long flags;
 984         save_flags(flags);
 985         cli();
 986         if (hlt_disabled){
 987                 hlt_disabled=0;
 988 #ifdef HAVE_DISABLE_HLT
 989                 enable_hlt();
 990 #endif
 991         }
 992         restore_flags(flags);
 993 }
 994 
 995 
 996 static void setup_DMA(void)
     /*  */
 997 {
 998 #ifdef FLOPPY_SANITY_CHECK
 999         if (raw_cmd->length == 0){
1000                 int i;
1001 
1002                 printk("zero dma transfer size:");
1003                 for (i=0; i < raw_cmd->cmd_count; i++)
1004                         printk("%x,", raw_cmd->cmd[i]);
1005                 printk("\n");
1006                 cont->done(0);
1007                 FDCS->reset = 1;
1008                 return;
1009         }
1010         if ((long) raw_cmd->kernel_data % 512){
1011                 printk("non aligned address: %p\n", raw_cmd->kernel_data);
1012                 cont->done(0);
1013                 FDCS->reset=1;
1014                 return;
1015         }
1016         if (CROSS_64KB(raw_cmd->kernel_data, raw_cmd->length)) {
1017                 printk("DMA crossing 64-K boundary %p-%p\n",
1018                        raw_cmd->kernel_data,
1019                        raw_cmd->kernel_data + raw_cmd->length);
1020                 cont->done(0);
1021                 FDCS->reset=1;
1022                 return;
1023         }
1024 #endif
1025         cli();
1026         fd_disable_dma();
1027         fd_clear_dma_ff();
1028         fd_set_dma_mode((raw_cmd->flags & FD_RAW_READ)?
1029                         DMA_MODE_READ : DMA_MODE_WRITE);
1030         fd_set_dma_addr(virt_to_bus(raw_cmd->kernel_data));
1031         fd_set_dma_count(raw_cmd->length);
1032         virtual_dma_port = FDCS->address;
1033         fd_enable_dma();
1034         sti();
1035         floppy_disable_hlt();
1036 }
1037 
1038 void show_floppy(void);
1039 
1040 /* waits until the fdc becomes ready */
1041 static int wait_til_ready(void)
     /*  */
1042 {
1043         int counter, status;
1044         if(FDCS->reset)
1045                 return -1;
1046         for (counter = 0; counter < 10000; counter++) {
1047                 status = fd_inb(FD_STATUS);             
1048                 if (status & STATUS_READY)
1049                         return status;
1050         }
1051         if (!initialising) {
1052                 DPRINT2("Getstatus times out (%x) on fdc %d\n",
1053                         status, fdc);
1054                 show_floppy();
1055         }
1056         FDCS->reset = 1;
1057         return -1;
1058 }
1059 
1060 /* sends a command byte to the fdc */
1061 static int output_byte(char byte)
     /*  */
1062 {
1063         int status;
1064 
1065         if ((status = wait_til_ready()) < 0)
1066                 return -1;
1067         if ((status & (STATUS_READY|STATUS_DIR|STATUS_DMA)) == STATUS_READY){
1068                 fd_outb(byte,FD_DATA);
1069 #ifdef FLOPPY_SANITY_CHECK
1070                 output_log[output_log_pos].data = byte;
1071                 output_log[output_log_pos].status = status;
1072                 output_log[output_log_pos].jiffies = jiffies;
1073                 output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1074 #endif
1075                 return 0;
1076         }
1077         FDCS->reset = 1;
1078         if (!initialising) {
1079                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1080                         byte, status);
1081                 show_floppy();
1082         }
1083         return -1;
1084 }
1085 #define LAST_OUT(x) if (output_byte(x)<0){ reset_fdc();return;}
1086 
1087 /* gets the response from the fdc */
1088 static int result(void)
     /*  */
1089 {
1090         int i, status;
1091 
1092         for(i=0; i < MAX_REPLIES; i++) {
1093                 if ((status = wait_til_ready()) < 0)
1094                         break;
1095                 status &= STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA;
1096                 if ((status & ~STATUS_BUSY) == STATUS_READY){
1097 #ifdef FLOPPY_SANITY_CHECK
1098                         resultjiffies = jiffies;
1099                         resultsize = i;
1100 #endif
1101                         return i;
1102                 }
1103                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY))
1104                         reply_buffer[i] = fd_inb(FD_DATA);
1105                 else
1106                         break;
1107         }
1108         if(!initialising) {
1109                 DPRINT2("'get result' error. Last status=%x Read bytes=%d\n",
1110                         status, i);
1111                 show_floppy();
1112         }
1113         FDCS->reset = 1;
1114         return -1;
1115 }
1116 
1117 #define MORE_OUTPUT -2
1118 /* does the fdc need more output? */
1119 static int need_more_output(void)
     /*  */
1120 {
1121         int status;
1122         if( (status = wait_til_ready()) < 0)
1123                 return -1;
1124         if ((status & (STATUS_READY|STATUS_DIR|STATUS_DMA)) == STATUS_READY)
1125                 return MORE_OUTPUT;
1126         return result();
1127 }
1128 
1129 /* Set perpendicular mode as required, based on data rate, if supported.
1130  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1131  */
1132 static inline void perpendicular_mode(void)
     /*  */
1133 {
1134         unsigned char perp_mode;
1135 
1136         if (raw_cmd->rate & 0x40){
1137                 switch(raw_cmd->rate & 3){
1138                         case 0:
1139                                 perp_mode=2;
1140                                 break;
1141                         case 3:
1142                                 perp_mode=3;
1143                                 break;
1144                         default:
1145                                 DPRINT("Invalid data rate for perpendicular mode!\n");
1146                                 cont->done(0);
1147                                 FDCS->reset = 1; /* convenient way to return to
1148                                                   * redo without to much hassle (deep
1149                                                   * stack et al. */
1150                                 return;
1151                 }
1152         } else
1153                 perp_mode = 0;
1154 
1155         if (FDCS->perp_mode == perp_mode)
1156                 return;
1157         if (FDCS->version >= FDC_82077_ORIG) {
1158                 output_byte(FD_PERPENDICULAR);
1159                 output_byte(perp_mode);
1160                 FDCS->perp_mode = perp_mode;
1161         } else if (perp_mode) {
1162                 DPRINT("perpendicular mode not supported by this FDC.\n");
1163         }
1164 } /* perpendicular_mode */
1165 
1166 static int fifo = 0xa;
1167 
1168 static int fdc_configure(void)
     /*  */
1169 {
1170         /* Turn on FIFO */
1171         output_byte(FD_CONFIGURE);
1172 #ifdef __sparc__ 
1173         output_byte(0x64);      /* Motor off timeout */
1174         output_byte(fdc_cfg | 0x0A);
1175 #else
1176         if(need_more_output() != MORE_OUTPUT)
1177                 return 0;
1178         output_byte(0);
1179         output_byte(0x10 | (fifo & 0xf)); /* FIFO on, polling off,
1180                                              10 byte threshold */
1181 #endif
1182         output_byte(0); /* precompensation from track 
1183                            0 upwards */
1184         return 1;
1185 }       
1186 
1187 #define NOMINAL_DTR 500
1188 
1189 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1190  * head load time, and DMA disable flag to values needed by floppy.
1191  *
1192  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1193  * to account for the data rate-based scaling done by the 82072 and 82077
1194  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1195  * 8272a).
1196  *
1197  * Note that changing the data transfer rate has a (probably deleterious)
1198  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1199  * fdc_specify is called again after each data transfer rate
1200  * change.
1201  *
1202  * srt: 1000 to 16000 in microseconds
1203  * hut: 16 to 240 milliseconds
1204  * hlt: 2 to 254 milliseconds
1205  *
1206  * These values are rounded up to the next highest available delay time.
1207  */
1208 static void fdc_specify(void)
     /*  */
1209 {
1210         unsigned char spec1, spec2;
1211         int srt, hlt, hut;
1212         unsigned long dtr = NOMINAL_DTR;
1213         unsigned long scale_dtr = NOMINAL_DTR;
1214         int hlt_max_code = 0x7f;
1215         int hut_max_code = 0xf;
1216 
1217         if (FDCS->need_configure && FDCS->has_fifo) {
1218                 fdc_configure();
1219                 FDCS->need_configure = 0;
1220                 /*DPRINT("FIFO enabled\n");*/
1221         }
1222 
1223 #ifdef __sparc__
1224         /* If doing implied seeks, no specify necessary */
1225         if(fdc_cfg&0x40)
1226                 return;
1227 #endif
1228 
1229         switch (raw_cmd->rate & 0x03) {
1230                 case 3:
1231                         dtr = 1000;
1232                         break;
1233                 case 1:
1234                         dtr = 300;
1235                         if (FDCS->version >= FDC_82078) {
1236                                 /* chose the default rate table, not the one
1237                                  * where 1 = 2 Mbps */
1238                                 output_byte(FD_DRIVESPEC);
1239                                 if(need_more_output() == MORE_OUTPUT) {
1240                                         output_byte(UNIT(current_drive));
1241                                         output_byte(0xc0);
1242                                 }
1243                         }
1244                         break;
1245                 case 2:
1246                         dtr = 250;
1247                         break;
1248         }
1249 
1250         if (FDCS->version >= FDC_82072) {
1251                 scale_dtr = dtr;
1252                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1253                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1254         }
1255 
1256         /* Convert step rate from microseconds to milliseconds and 4 bits */
1257         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1258         SUPBOUND(srt, 0xf);
1259         INFBOUND(srt, 0);
1260 
1261         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1262         if (hlt < 0x01)
1263                 hlt = 0x01;
1264         else if (hlt > 0x7f)
1265                 hlt = hlt_max_code;
1266 
1267         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1268         if (hut < 0x1)
1269                 hut = 0x1;
1270         else if (hut > 0xf)
1271                 hut = hut_max_code;
1272 
1273         spec1 = (srt << 4) | hut;
1274         spec2 = (hlt << 1) | (use_virtual_dma & 1);
1275 
1276         /* If these parameters did not change, just return with success */
1277         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1278                 /* Go ahead and set spec1 and spec2 */
1279                 output_byte(FD_SPECIFY);
1280                 output_byte(FDCS->spec1 = spec1);
1281                 output_byte(FDCS->spec2 = spec2);
1282         }
1283 } /* fdc_specify */
1284 
1285 /* Set the FDC's data transfer rate on behalf of the specified drive.
1286  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1287  * of the specify command (i.e. using the fdc_specify function).
1288  */
1289 static int fdc_dtr(void)
     /*  */
1290 {
1291         /* If data rate not already set to desired value, set it. */
1292         if ((raw_cmd->rate & 3) == FDCS->dtr)
1293                 return 0;
1294 
1295         /* Set dtr */
1296         fd_outb(raw_cmd->rate & 3, FD_DCR);
1297 
1298         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1299          * need a stabilization period of several milliseconds to be
1300          * enforced after data rate changes before R/W operations.
1301          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1302          */
1303         FDCS->dtr = raw_cmd->rate & 3;
1304         return(wait_for_completion(jiffies+2*HZ/100,
1305                                    (timeout_fn) floppy_ready));
1306 } /* fdc_dtr */
1307 
1308 static void tell_sector(void)
     /*  */
1309 {
1310         printk(": track %d, head %d, sector %d, size %d",
1311                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1312 } /* tell_sector */
1313 
1314 
1315 /*
1316  * Ok, this error interpreting routine is called after a
1317  * DMA read/write has succeeded
1318  * or failed, so we check the results, and copy any buffers.
1319  * hhb: Added better error reporting.
1320  * ak: Made this into a separate routine.
1321  */
1322 static int interpret_errors(void)
     /*  */
1323 {
1324         char bad;
1325 
1326         if (inr!=7) {
1327                 DPRINT("-- FDC reply error");
1328                 FDCS->reset = 1;
1329                 return 1;
1330         }
1331 
1332         /* check IC to find cause of interrupt */
1333         switch (ST0 & ST0_INTR) {
1334                 case 0x40:      /* error occurred during command execution */
1335                         if (ST1 & ST1_EOC)
1336                                 return 0; /* occurs with pseudo-DMA */
1337                         bad = 1;
1338                         if (ST1 & ST1_WP) {
1339                                 DPRINT("Drive is write protected\n");
1340                                 CLEARF(FD_DISK_WRITABLE);
1341                                 cont->done(0);
1342                                 bad = 2;
1343                         } else if (ST1 & ST1_ND) {
1344                                 SETF(FD_NEED_TWADDLE);
1345                         } else if (ST1 & ST1_OR) {
1346                                 if (DP->flags & FTD_MSG)
1347                                         DPRINT("Over/Underrun - retrying\n");
1348                                 bad = 0;
1349                         }else if (*errors >= DP->max_errors.reporting){
1350                                 DPRINT("");
1351                                 if (ST0 & ST0_ECE) {
1352                                         printk("Recalibrate failed!");
1353                                 } else if (ST2 & ST2_CRC) {
1354                                         printk("data CRC error");
1355                                         tell_sector();
1356                                 } else if (ST1 & ST1_CRC) {
1357                                         printk("CRC error");
1358                                         tell_sector();
1359                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1360                                         if (!probing) {
1361                                                 printk("sector not found");
1362                                                 tell_sector();
1363                                         } else
1364                                                 printk("probe failed...");
1365                                 } else if (ST2 & ST2_WC) {      /* seek error */
1366                                         printk("wrong cylinder");
1367                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1368                                         printk("bad cylinder");
1369                                 } else {
1370                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1371                                         tell_sector();
1372                                 }
1373                                 printk("\n");
1374 
1375                         }
1376                         if (ST2 & ST2_WC || ST2 & ST2_BC)
1377                                 /* wrong cylinder => recal */
1378                                 DRS->track = NEED_2_RECAL;
1379                         return bad;
1380                 case 0x80: /* invalid command given */
1381                         DPRINT("Invalid FDC command given!\n");
1382                         cont->done(0);
1383                         return 2;
1384                 case 0xc0:
1385                         DPRINT("Abnormal termination caused by polling\n");
1386                         cont->error();
1387                         return 2;
1388                 default: /* (0) Normal command termination */
1389                         return 0;
1390         }
1391 }
1392 
1393 /*
1394  * This routine is called when everything should be correctly set up
1395  * for the transfer (ie floppy motor is on, the correct floppy is
1396  * selected, and the head is sitting on the right track).
1397  */
1398 static void setup_rw_floppy(void)
     /*  */
1399 {
1400         int i,ready_date,r, flags,dflags;
1401         timeout_fn function;
1402 
1403         flags = raw_cmd->flags;
1404         if (flags & (FD_RAW_READ | FD_RAW_WRITE))
1405                 flags |= FD_RAW_INTR;
1406 
1407         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1408                 ready_date = DRS->spinup_date + DP->spinup;
1409                 /* If spinup will take a long time, rerun scandrives
1410                  * again just before spinup completion. Beware that
1411                  * after scandrives, we must again wait for selection.
1412                  */
1413                 if (ready_date > jiffies + DP->select_delay){
1414                         ready_date -= DP->select_delay;
1415                         function = (timeout_fn) floppy_start;
1416                 } else
1417                         function = (timeout_fn) setup_rw_floppy;
1418 
1419                 /* wait until the floppy is spinning fast enough */
1420                 if (wait_for_completion(ready_date,function))
1421                         return;
1422         }
1423         dflags = DRS->flags;
1424 
1425         if ((flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1426                 setup_DMA();
1427 
1428         if (flags & FD_RAW_INTR)
1429                 SET_INTR(main_command_interrupt);
1430 
1431         r=0;
1432         for (i=0; i< raw_cmd->cmd_count; i++)
1433                 r|=output_byte(raw_cmd->cmd[i]);
1434 
1435 #ifdef DEBUGT
1436         debugt("rw_command: ");
1437 #endif
1438         if (r){
1439                 cont->error();
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 #ifdef __sparc__
1562         if (fdc_cfg&0x40) {
1563                 /* Implied seeks being done... */
1564                 DRS->track = raw_cmd->track;
1565                 setup_rw_floppy();
1566                 return;
1567         }
1568 #endif
1569 
1570         SET_INTR(seek_interrupt);
1571         output_byte(FD_SEEK);
1572         output_byte(UNIT(current_drive));
1573         LAST_OUT(track);
1574 #ifdef DEBUGT
1575         debugt("seek command:");
1576 #endif
1577 }
1578 
1579 static void recal_interrupt(void)
     /*  */
1580 {
1581 #ifdef DEBUGT
1582         debugt("recal interrupt:");
1583 #endif
1584         if (inr !=2)
1585                 FDCS->reset = 1;
1586         else if (ST0 & ST0_ECE) {
1587                 switch(DRS->track){
1588                         case NEED_1_RECAL:
1589 #ifdef DEBUGT
1590                                 debugt("recal interrupt need 1 recal:");
1591 #endif
1592                                 /* after a second recalibrate, we still haven't
1593                                  * reached track 0. Probably no drive. Raise an
1594                                  * error, as failing immediately might upset
1595                                  * computers possessed by the Devil :-) */
1596                                 cont->error();
1597                                 cont->redo();
1598                                 return;
1599                         case NEED_2_RECAL:
1600 #ifdef DEBUGT
1601                                 debugt("recal interrupt need 2 recal:");
1602 #endif
1603                                 /* If we already did a recalibrate,
1604                                  * and we are not at track 0, this
1605                                  * means we have moved. (The only way
1606                                  * not to move at recalibration is to
1607                                  * be already at track 0.) Clear the
1608                                  * new change flag */
1609 #ifdef DCL_DEBUG
1610                                 if (DP->flags & FD_DEBUG){
1611                                         DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1612                                 }
1613 #endif
1614 
1615                                 CLEARF(FD_DISK_NEWCHANGE);
1616                                 DRS->select_date = jiffies;
1617                                 /* fall through */
1618                         default:
1619 #ifdef DEBUGT
1620                                 debugt("recal interrupt default:");
1621 #endif
1622                                 /* Recalibrate moves the head by at
1623                                  * most 80 steps. If after one
1624                                  * recalibrate we don't have reached
1625                                  * track 0, this might mean that we
1626                                  * started beyond track 80.  Try
1627                                  * again.  */
1628                                 DRS->track = NEED_1_RECAL;
1629                                 break;
1630                 }
1631         } else
1632                 DRS->track = ST1;
1633         floppy_ready();
1634 }
1635 
1636 /*
1637  * Unexpected interrupt - Print as much debugging info as we can...
1638  * All bets are off...
1639  */
1640 static void unexpected_floppy_interrupt(void)
     /*  */
1641 {
1642         int i;
1643         if (initialising)
1644                 return;
1645         if (print_unex){
1646                 DPRINT("unexpected interrupt\n");
1647                 if (inr >= 0)
1648                         for (i=0; i<inr; i++)
1649                                 printk("%d %x\n", i, reply_buffer[i]);
1650         }
1651         while(1){
1652                 output_byte(FD_SENSEI);
1653                 inr=result();
1654                 if (inr != 2)
1655                         break;
1656                 if (print_unex){
1657                         printk("sensei\n");
1658                         for (i=0; i<inr; i++)
1659                                 printk("%d %x\n", i, reply_buffer[i]);
1660                 }
1661         }
1662         FDCS->reset = 1;
1663 }
1664 
1665 static struct tq_struct floppy_tq =
1666 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1667 
1668 /* interrupt handler */
1669 static void floppy_interrupt(int irq, void *dev_id, struct pt_regs * regs)
     /*  */
1670 {
1671         void (*handler)(void) = DEVICE_INTR;
1672 
1673         lasthandler = handler;
1674         interruptjiffies = jiffies;
1675 
1676         fd_disable_dma();
1677         floppy_enable_hlt();
1678         CLEAR_INTR;
1679         if (fdc >= N_FDC || FDCS->address == -1){
1680                 /* we don't even know which FDC is the culprit */
1681                 printk("DOR0=%x\n", fdc_state[0].dor);
1682                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1683                 printk("handler=%p\n", handler);
1684                 is_alive("bizarre fdc");
1685                 return;
1686         }
1687         inr = result();
1688         if (!handler){
1689                 unexpected_floppy_interrupt();
1690                 is_alive("unexpected");
1691                 return;
1692         }
1693         if (inr == 0){
1694                 do {
1695                         output_byte(FD_SENSEI);
1696                         inr = result();
1697                 } while ((ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1698         }
1699         floppy_tq.routine = (void *)(void *) handler;
1700         queue_task_irq(&floppy_tq, &tq_timer);
1701         is_alive("normal interrupt end");
1702 }
1703 
1704 static void recalibrate_floppy(void)
     /*  */
1705 {
1706 #ifdef DEBUGT
1707         debugt("recalibrate floppy:");
1708 #endif
1709         SET_INTR(recal_interrupt);
1710         output_byte(FD_RECALIBRATE);
1711         LAST_OUT(UNIT(current_drive));
1712 }
1713 
1714 /*
1715  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1716  */
1717 static void reset_interrupt(void)
     /*  */
1718 {
1719 #ifdef DEBUGT
1720         debugt("reset interrupt:");
1721 #endif
1722         result();               /* get the status ready for set_fdc */
1723         if (FDCS->reset) {
1724                 printk("reset set in interrupt, calling %p\n", cont->error);
1725                 cont->error(); /* a reset just after a reset. BAD! */
1726         }
1727         cont->redo();
1728 }
1729 
1730 /*
1731  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1732  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1733  */
1734 static void reset_fdc(void)
     /*  */
1735 {
1736         SET_INTR(reset_interrupt);
1737         FDCS->reset = 0;
1738         reset_fdc_info(0);
1739 
1740         /* Pseudo-DMA may intercept 'reset finished' interrupt.  */
1741         /* Irrelevant for systems with true DMA (i386).          */
1742         fd_disable_dma();
1743 
1744         if (FDCS->version >= FDC_82072A)
1745                 fd_outb(0x80 | (FDCS->dtr &3), FD_STATUS);
1746         else {
1747                 fd_outb(FDCS->dor & ~0x04, FD_DOR);
1748                 udelay(FD_RESET_DELAY);
1749                 fd_outb(FDCS->dor, FD_DOR);
1750         }
1751 }
1752 
1753 static void empty(void)
     /*  */
1754 {
1755 }
1756 
1757 void show_floppy(void)
     /*  */
1758 {
1759         int i;
1760 
1761         printk("\n");
1762         printk("floppy driver state\n");
1763         printk("-------------------\n");
1764         printk("now=%ld last interrupt=%d last called handler=%p\n",
1765                jiffies, interruptjiffies, lasthandler);
1766 
1767 
1768 #ifdef FLOPPY_SANITY_CHECK
1769         printk("timeout_message=%s\n", timeout_message);
1770         printk("last output bytes:\n");
1771         for (i=0; i < OLOGSIZE; i++)
1772                 printk("%2x %2x %ld\n",
1773                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1774                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1775                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1776         printk("last result at %d\n", resultjiffies);
1777         printk("last redo_fd_request at %d\n", lastredo);
1778         for (i=0; i<resultsize; i++){
1779                 printk("%2x ", reply_buffer[i]);
1780         }
1781         printk("\n");
1782 #endif
1783 
1784         printk("status=%x\n", fd_inb(FD_STATUS));
1785         printk("fdc_busy=%d\n", fdc_busy);
1786         if (DEVICE_INTR)
1787                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1788         if (floppy_tq.sync)
1789                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1790         if (fd_timer.prev)
1791                 printk("fd_timer.function=%p\n", fd_timer.function);
1792         if (fd_timeout.prev){
1793                 printk("timer_table=%p\n",fd_timeout.function);
1794                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1795                 printk("now=%ld\n",jiffies);
1796         }
1797         printk("cont=%p\n", cont);
1798         printk("CURRENT=%p\n", CURRENT);
1799         printk("command_status=%d\n", command_status);
1800         printk("\n");
1801 }
1802 
1803 static void floppy_shutdown(unsigned long mode)
     /*  */
1804 {
1805         if (!initialising && !mode)
1806                 show_floppy();
1807         CLEAR_INTR;
1808         floppy_tq.routine = (void *)(void *) empty;
1809         del_timer(&fd_timer);
1810         sti();
1811 
1812         floppy_enable_hlt();
1813         fd_disable_dma();
1814         /* avoid dma going to a random drive after shutdown */
1815 
1816         if (!initialising && !mode)
1817                 DPRINT("floppy timeout\n");
1818         FDCS->reset = 1;
1819         if (cont){
1820                 cont->done(0);
1821                 cont->redo(); /* this will recall reset when needed */
1822         } else {
1823                 printk("no cont in shutdown!\n");
1824                 process_fd_request();
1825         }
1826         is_alive("floppy shutdown");
1827 }
1828 /*typedef void (*timeout_fn)(unsigned long);*/
1829 
1830 /* start motor, check media-changed condition and write protection */
1831 static int start_motor(void (*function)(void) )
     /*  */
1832 {
1833         int mask, data;
1834 
1835         mask = 0xfc;
1836         data = UNIT(current_drive);
1837         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR)){
1838                 if (!(FDCS->dor & (0x10 << UNIT(current_drive)))){
1839                         set_debugt();
1840                         /* no read since this drive is running */
1841                         DRS->first_read_date = 0;
1842                         /* note motor start time if motor is not yet running */
1843                         DRS->spinup_date = jiffies;
1844                         data |= (0x10 << UNIT(current_drive));
1845                 }
1846         } else
1847                 if (FDCS->dor & (0x10 << UNIT(current_drive)))
1848                         mask &= ~(0x10 << UNIT(current_drive));
1849 
1850         /* starts motor and selects floppy */
1851         del_timer(motor_off_timer + current_drive);
1852         set_dor(fdc, mask, data);
1853 
1854         /* wait_for_completion also schedules reset if needed. */
1855         return(wait_for_completion(DRS->select_date+DP->select_delay,
1856                                    (timeout_fn) function));
1857 }
1858 
1859 static void floppy_ready(void)
     /*  */
1860 {
1861         CHECK_RESET;
1862         if (start_motor(floppy_ready)) return;
1863         if (fdc_dtr()) return;
1864 
1865 #ifdef DCL_DEBUG
1866         if (DP->flags & FD_DEBUG){
1867                 DPRINT("calling disk change from floppy_ready\n");
1868         }
1869 #endif
1870 
1871         if (!(raw_cmd->flags & FD_RAW_NO_MOTOR) &&
1872            disk_change(current_drive) &&
1873            !DP->select_delay)
1874                 twaddle(); /* this clears the dcl on certain drive/controller
1875                             * combinations */
1876 
1877         if (raw_cmd->flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1878                 perpendicular_mode();
1879                 fdc_specify(); /* must be done here because of hut, hlt ... */
1880                 seek_floppy();
1881         } else
1882                 setup_rw_floppy();
1883 }
1884 
1885 static void floppy_start(void)
     /*  */
1886 {
1887         reschedule_timeout(CURRENTD, "floppy start", 0);
1888 
1889         scandrives();
1890 #ifdef DCL_DEBUG
1891         if (DP->flags & FD_DEBUG){
1892                 DPRINT("setting NEWCHANGE in floppy_start\n");
1893         }
1894 #endif
1895         SETF(FD_DISK_NEWCHANGE);
1896         floppy_ready();
1897 }
1898 
1899 /*
1900  * ========================================================================
1901  * here ends the bottom half. Exported routines are:
1902  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1903  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1904  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1905  * and set_dor.
1906  * ========================================================================
1907  */
1908 /*
1909  * General purpose continuations.
1910  * ==============================
1911  */
1912 
1913 static void do_wakeup(void)
     /*  */
1914 {
1915         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1916         cont = 0;
1917         command_status += 2;
1918         wake_up(&command_done);
1919 }
1920 
1921 static struct cont_t wakeup_cont={
1922         empty,
1923         do_wakeup,
1924         empty,
1925         (done_f)empty
1926 };
1927 
1928 static int wait_til_done(void (*handler)(void), int interruptible)
     /*  */
1929 {
1930         int ret;
1931 
1932         floppy_tq.routine = (void *)(void *) handler;
1933         queue_task(&floppy_tq, &tq_timer);
1934 
1935         cli();
1936         while(command_status < 2 && NO_SIGNAL){
1937                 is_alive("wait_til_done");
1938                 if (interruptible)
1939                         interruptible_sleep_on(&command_done);
1940                 else
1941                         sleep_on(&command_done);
1942         }
1943         if (command_status < 2){
1944                 floppy_shutdown(1);
1945                 sti();
1946                 process_fd_request();
1947                 return -EINTR;
1948         }
1949         sti();
1950 
1951         if (FDCS->reset)
1952                 command_status = FD_COMMAND_ERROR;
1953         if (command_status == FD_COMMAND_OKAY)
1954                 ret=0;
1955         else
1956                 ret=-EIO;
1957         command_status = FD_COMMAND_NONE;
1958         return ret;
1959 }
1960 
1961 static void generic_done(int result)
     /*  */
1962 {
1963         command_status = result;
1964         cont = &wakeup_cont;
1965 }
1966 
1967 static void generic_success(void)
     /*  */
1968 {
1969         cont->done(1);
1970 }
1971 
1972 static void generic_failure(void)
     /*  */
1973 {
1974         cont->done(0);
1975 }
1976 
1977 static void success_and_wakeup(void)
     /*  */
1978 {
1979         generic_success();
1980         cont->redo();
1981 }
1982 
1983 
1984 /*
1985  * formatting and rw support.
1986  * ==========================
1987  */
1988 
1989 static int next_valid_format(void)
     /*  */
1990 {
1991         int probed_format;
1992 
1993         probed_format = DRS->probed_format;
1994         while(1){
1995                 if (probed_format >= 8 ||
1996                      !DP->autodetect[probed_format]){
1997                         DRS->probed_format = 0;
1998                         return 1;
1999                 }
2000                 if (floppy_type[DP->autodetect[probed_format]].sect){
2001                         DRS->probed_format = probed_format;
2002                         return 0;
2003                 }
2004                 probed_format++;
2005         }
2006 }
2007 
2008 static void bad_flp_intr(void)
     /*  */
2009 {
2010         if (probing){
2011                 DRS->probed_format++;
2012                 if (!next_valid_format())
2013                         return;
2014         }
2015         (*errors)++;
2016         INFBOUND(DRWE->badness, *errors);
2017         if (*errors > DP->max_errors.abort)
2018                 cont->done(0);
2019         if (*errors > DP->max_errors.reset)
2020                 FDCS->reset = 1;
2021         else if (*errors > DP->max_errors.recal)
2022                 DRS->track = NEED_2_RECAL;
2023 }
2024 
2025 static void set_floppy(kdev_t device)
     /*  */
2026 {
2027         if (TYPE(device))
2028                 _floppy = TYPE(device) + floppy_type;
2029         else
2030                 _floppy = current_type[ DRIVE(device) ];
2031 }
2032 
2033 /*
2034  * formatting and support.
2035  * =======================
2036  */
2037 static void format_interrupt(void)
     /*  */
2038 {
2039         switch (interpret_errors()){
2040                 case 1:
2041                         cont->error();
2042                 case 2:
2043                         break;
2044                 case 0:
2045                         cont->done(1);
2046         }
2047         cont->redo();
2048 }
2049 
2050 #define CODE2SIZE (ssize = ((1 << SIZECODE) + 3) >> 2)
2051 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80) >>1))
2052 #define CT(x) ((x) | 0x40)
2053 static void setup_format_params(int track)
     /*  */
2054 {
2055         struct fparm {
2056                 unsigned char track,head,sect,size;
2057         } *here = (struct fparm *)floppy_track_buffer;
2058         int il,n;
2059         int count,head_shift,track_shift;
2060 
2061         raw_cmd = &default_raw_cmd;
2062         raw_cmd->track = track;
2063 
2064         raw_cmd->flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2065                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
2066         raw_cmd->rate = _floppy->rate & 0x43;
2067         raw_cmd->cmd_count = NR_F;
2068         COMMAND = FM_MODE(_floppy,FD_FORMAT);
2069         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy,format_req.head);
2070         F_SIZECODE = FD_SIZECODE(_floppy);
2071         F_SECT_PER_TRACK = _floppy->sect << 2 >> F_SIZECODE;
2072         F_GAP = _floppy->fmt_gap;
2073         F_FILL = FD_FILL_BYTE;
2074 
2075         raw_cmd->kernel_data = floppy_track_buffer;
2076         raw_cmd->length = 4 * F_SECT_PER_TRACK;
2077 
2078         /* allow for about 30ms for data transport per track */
2079         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
2080 
2081         /* a ``cylinder'' is two tracks plus a little stepping time */
2082         track_shift = 2 * head_shift + 3;
2083 
2084         /* position of logical sector 1 on this track */
2085         n = (track_shift * format_req.track + head_shift * format_req.head)
2086                 % F_SECT_PER_TRACK;
2087 
2088         /* determine interleave */
2089         il = 1;
2090         if (_floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2091                 il++;
2092 
2093         /* initialize field */
2094         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2095                 here[count].track = format_req.track;
2096                 here[count].head = format_req.head;
2097                 here[count].sect = 0;
2098                 here[count].size = F_SIZECODE;
2099         }
2100         /* place logical sectors */
2101         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2102                 here[n].sect = count;
2103                 n = (n+il) % F_SECT_PER_TRACK;
2104                 if (here[n].sect) { /* sector busy, find next free sector */
2105                         ++n;
2106                         if (n>= F_SECT_PER_TRACK) {
2107                                 n-=F_SECT_PER_TRACK;
2108                                 while (here[n].sect) ++n;
2109                         }
2110                 }
2111         }
2112 }
2113 
2114 static void redo_format(void)
     /*  */
2115 {
2116         buffer_track = -1;
2117         setup_format_params(format_req.track << STRETCH(_floppy));
2118         floppy_start();
2119 #ifdef DEBUGT
2120         debugt("queue format request");
2121 #endif
2122 }
2123 
2124 static struct cont_t format_cont={
2125         format_interrupt,
2126         redo_format,
2127         bad_flp_intr,
2128         generic_done };
2129 
2130 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /*  */
2131 {
2132         int ret;
2133         int drive=DRIVE(device);
2134 
2135         LOCK_FDC(drive,1);
2136         set_floppy(device);
2137         if (!_floppy ||
2138             _floppy->track > DP->tracks ||
2139             tmp_format_req->track >= _floppy->track ||
2140             tmp_format_req->head >= _floppy->head ||
2141             (_floppy->sect << 2) % (1 <<  FD_SIZECODE(_floppy)) ||
2142             !_floppy->fmt_gap) {
2143                 process_fd_request();
2144                 return -EINVAL;
2145         }
2146         format_req = *tmp_format_req;
2147         format_errors = 0;
2148         cont = &format_cont;
2149         errors = &format_errors;
2150         IWAIT(redo_format);
2151         process_fd_request();
2152         return ret;
2153 }
2154 
2155 /*
2156  * Buffer read/write and support
2157  * =============================
2158  */
2159 
2160 /* new request_done. Can handle physical sectors which are smaller than a
2161  * logical buffer */
2162 static void request_done(int uptodate)
     /*  */
2163 {
2164         int block;
2165 
2166         probing = 0;
2167         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2168 
2169         if (!CURRENT){
2170                 DPRINT("request list destroyed in floppy request done\n");
2171                 return;
2172         }
2173 
2174         if (uptodate){
2175                 /* maintain values for invalidation on geometry
2176                  * change */
2177                 block = current_count_sectors + CURRENT->sector;
2178                 INFBOUND(DRS->maxblock, block);
2179                 if (block > _floppy->sect)
2180                         DRS->maxtrack = 1;
2181 
2182                 /* unlock chained buffers */
2183                 while (current_count_sectors && CURRENT &&
2184                        current_count_sectors >= CURRENT->current_nr_sectors){
2185                         current_count_sectors -= CURRENT->current_nr_sectors;
2186                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2187                         CURRENT->sector += CURRENT->current_nr_sectors;
2188                         end_request(1);
2189                 }
2190                 if (current_count_sectors && CURRENT){
2191                         /* "unlock" last subsector */
2192                         CURRENT->buffer += current_count_sectors <<9;
2193                         CURRENT->current_nr_sectors -= current_count_sectors;
2194                         CURRENT->nr_sectors -= current_count_sectors;
2195                         CURRENT->sector += current_count_sectors;
2196                         return;
2197                 }
2198 
2199                 if (current_count_sectors && !CURRENT)
2200                         DPRINT("request list destroyed in floppy request done\n");
2201 
2202         } else {
2203                 if (CURRENT->cmd == WRITE) {
2204                         /* record write error information */
2205                         DRWE->write_errors++;
2206                         if (DRWE->write_errors == 1) {
2207                                 DRWE->first_error_sector = CURRENT->sector;
2208                                 DRWE->first_error_generation = DRS->generation;
2209                         }
2210                         DRWE->last_error_sector = CURRENT->sector;
2211                         DRWE->last_error_generation = DRS->generation;
2212                 }
2213                 end_request(0);
2214         }
2215 }
2216 
2217 /* Interrupt handler evaluating the result of the r/w operation */
2218 static void rw_interrupt(void)
     /*  */
2219 {
2220         int nr_sectors, ssize, eoc;
2221 
2222         if (!DRS->first_read_date)
2223                 DRS->first_read_date = jiffies;
2224 
2225         nr_sectors = 0;
2226         CODE2SIZE;
2227 
2228         if(ST1 & ST1_EOC)
2229                 eoc = 1;
2230         else
2231                 eoc = 0;
2232         nr_sectors = ((R_TRACK-TRACK)*_floppy->head+R_HEAD-HEAD) *
2233                 _floppy->sect + ((R_SECTOR-SECTOR+eoc) <<  SIZECODE >> 2) -
2234                 (sector_t % _floppy->sect) % ssize;
2235 
2236 #ifdef FLOPPY_SANITY_CHECK
2237         if (nr_sectors > current_count_sectors + ssize -
2238              (current_count_sectors + sector_t) % ssize +
2239              sector_t % ssize){
2240                 DPRINT2("long rw: %x instead of %lx\n",
2241                         nr_sectors, current_count_sectors);
2242                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2243                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2244                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2245                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2246                        sector_t, ssize);
2247         }
2248 #endif
2249         INFBOUND(nr_sectors,0);
2250         SUPBOUND(current_count_sectors, nr_sectors);
2251 
2252         switch (interpret_errors()){
2253                 case 2:
2254                         cont->redo();
2255                         return;
2256                 case 1:
2257                         if (!current_count_sectors){
2258                                 cont->error();
2259                                 cont->redo();
2260                                 return;
2261                         }
2262                         break;
2263                 case 0:
2264                         if (!current_count_sectors){
2265                                 cont->redo();
2266                                 return;
2267                         }
2268                         current_type[current_drive] = _floppy;
2269                         floppy_sizes[TOMINOR(current_drive) ]= _floppy->size>>1;
2270                         break;
2271         }
2272 
2273         if (probing) {
2274                 if (DP->flags & FTD_MSG)
2275                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2276                                 _floppy->name,current_drive);
2277                 current_type[current_drive] = _floppy;
2278                 floppy_sizes[TOMINOR(current_drive)] = _floppy->size >> 1;
2279                 probing = 0;
2280         }
2281 
2282         if (CT(COMMAND) != FD_READ || 
2283              raw_cmd->kernel_data == CURRENT->buffer){
2284                 /* transfer directly from buffer */
2285                 cont->done(1);
2286         } else if (CT(COMMAND) == FD_READ){
2287                 buffer_track = raw_cmd->track;
2288                 buffer_drive = current_drive;
2289                 INFBOUND(buffer_max, nr_sectors + sector_t);
2290         }
2291         cont->redo();
2292 }
2293 
2294 /* Compute maximal contiguous buffer size. */
2295 static int buffer_chain_size(void)
     /*  */
2296 {
2297         struct buffer_head *bh;
2298         int size;
2299         char *base;
2300 
2301         base = CURRENT->buffer;
2302         size = CURRENT->current_nr_sectors << 9;
2303         bh = CURRENT->bh;
2304 
2305         if (bh){
2306                 bh = bh->b_reqnext;
2307                 while (bh && bh->b_data == base + size){
2308                         size += bh->b_size;
2309                         bh = bh->b_reqnext;
2310                 }
2311         }
2312         return size >> 9;
2313 }
2314 
2315 /* Compute the maximal transfer size */
2316 static int transfer_size(int ssize, int max_sector, int max_size)
     /*  */
2317 {
2318         SUPBOUND(max_sector, sector_t + max_size);
2319 
2320         /* alignment */
2321         max_sector -= (max_sector % _floppy->sect) % ssize;
2322 
2323         /* transfer size, beginning not aligned */
2324         current_count_sectors = max_sector - sector_t ;
2325 
2326         return max_sector;
2327 }
2328 
2329 /*
2330  * Move data from/to the track buffer to/from the buffer cache.
2331  */
2332 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /*  */
2333 {
2334         int remaining; /* number of transferred 512-byte sectors */
2335         struct buffer_head *bh;
2336         char *buffer, *dma_buffer;
2337         int size;
2338 
2339         max_sector = transfer_size(ssize,
2340                                    minimum(max_sector, max_sector_2),
2341                                    CURRENT->nr_sectors);
2342 
2343         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2344             buffer_max > sector_t + CURRENT->nr_sectors)
2345                 current_count_sectors = minimum(buffer_max - sector_t,
2346                                                 CURRENT->nr_sectors);
2347 
2348         remaining = current_count_sectors << 9;
2349 #ifdef FLOPPY_SANITY_CHECK
2350         if ((remaining >> 9) > CURRENT->nr_sectors  &&
2351             CT(COMMAND) == FD_WRITE){
2352                 DPRINT("in copy buffer\n");
2353                 printk("current_count_sectors=%ld\n", current_count_sectors);
2354                 printk("remaining=%d\n", remaining >> 9);
2355                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2356                 printk("CURRENT->current_nr_sectors=%ld\n",
2357                        CURRENT->current_nr_sectors);
2358                 printk("max_sector=%d\n", max_sector);
2359                 printk("ssize=%d\n", ssize);
2360         }
2361 #endif
2362 
2363         buffer_max = maximum(max_sector, buffer_max);
2364 
2365         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2366 
2367         bh = CURRENT->bh;
2368         size = CURRENT->current_nr_sectors << 9;
2369         buffer = CURRENT->buffer;
2370 
2371         while (remaining > 0){
2372                 SUPBOUND(size, remaining);
2373 #ifdef FLOPPY_SANITY_CHECK
2374                 if (dma_buffer + size >
2375                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2376                     dma_buffer < floppy_track_buffer){
2377                         DPRINT1("buffer overrun in copy buffer %d\n",
2378                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2379                         printk("sector_t=%d buffer_min=%d\n",
2380                                sector_t, buffer_min);
2381                         printk("current_count_sectors=%ld\n",
2382                                current_count_sectors);
2383                         if (CT(COMMAND) == FD_READ)
2384                                 printk("read\n");
2385                         if (CT(COMMAND) == FD_READ)
2386                                 printk("write\n");
2387                         break;
2388                 }
2389                 if (((unsigned long)buffer) % 512)
2390                         DPRINT1("%p buffer not aligned\n", buffer);
2391 #endif
2392                 if (CT(COMMAND) == FD_READ) {
2393                         fd_cacheflush(dma_buffer, size);
2394                         memcpy(buffer, dma_buffer, size);
2395                 } else {
2396                         memcpy(dma_buffer, buffer, size);
2397                         fd_cacheflush(dma_buffer, size);
2398                 }
2399                 remaining -= size;
2400                 if (!remaining)
2401                         break;
2402 
2403                 dma_buffer += size;
2404                 bh = bh->b_reqnext;
2405 #ifdef FLOPPY_SANITY_CHECK
2406                 if (!bh){
2407                         DPRINT("bh=null in copy buffer after copy\n");
2408                         break;
2409                 }
2410 #endif
2411                 size = bh->b_size;
2412                 buffer = bh->b_data;
2413         }
2414 #ifdef FLOPPY_SANITY_CHECK
2415         if (remaining){
2416                 if (remaining > 0)
2417                         max_sector -= remaining >> 9;
2418                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2419         }
2420 #endif
2421 }
2422 
2423 /*
2424  * Formulate a read/write request.
2425  * this routine decides where to load the data (directly to buffer, or to
2426  * tmp floppy area), how much data to load (the size of the buffer, the whole
2427  * track, or a single sector)
2428  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2429  * allocation on the fly, it should be done here. No other part should need
2430  * modification.
2431  */
2432 
2433 static int make_raw_rw_request(void)
     /*  */
2434 {
2435         int aligned_sector_t;
2436         int max_sector, max_size, tracksize, ssize;
2437 
2438         set_fdc(DRIVE(CURRENT->rq_dev));
2439 
2440         raw_cmd = &default_raw_cmd;
2441         raw_cmd->flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2442                 FD_RAW_NEED_SEEK;
2443         raw_cmd->cmd_count = NR_RW;
2444         if (CURRENT->cmd == READ){
2445                 raw_cmd->flags |= FD_RAW_READ;
2446                 COMMAND = FM_MODE(_floppy,FD_READ);
2447         } else if (CURRENT->cmd == WRITE){
2448                 raw_cmd->flags |= FD_RAW_WRITE;
2449                 COMMAND = FM_MODE(_floppy,FD_WRITE);
2450         } else {
2451                 DPRINT("make_raw_rw_request: unknown command\n");
2452                 return 0;
2453         }
2454 
2455         max_sector = _floppy->sect * _floppy->head;
2456 
2457         TRACK = CURRENT->sector / max_sector;
2458         sector_t = CURRENT->sector % max_sector;
2459         if (_floppy->track && TRACK >= _floppy->track)
2460                 return 0;
2461         HEAD = sector_t / _floppy->sect;
2462 
2463         if (((_floppy->stretch & FD_SWAPSIDES) || TESTF(FD_NEED_TWADDLE)) &&
2464             sector_t < _floppy->sect)
2465                 max_sector = _floppy->sect;
2466 
2467         /* 2M disks have phantom sectors on the first track */
2468         if ((_floppy->rate & FD_2M) && (!TRACK) && (!HEAD)){
2469                 max_sector = 2 * _floppy->sect / 3;
2470                 if (sector_t >= max_sector){
2471                         current_count_sectors = minimum(_floppy->sect - sector_t,
2472                                                         CURRENT->nr_sectors);
2473                         return 1;
2474                 }
2475                 SIZECODE = 2;
2476         } else
2477                 SIZECODE = FD_SIZECODE(_floppy);
2478         raw_cmd->rate = _floppy->rate & 0x43;
2479         if ((_floppy->rate & FD_2M) &&
2480             (TRACK || HEAD) &&
2481             raw_cmd->rate == 2)
2482                 raw_cmd->rate = 1;
2483 
2484         if (SIZECODE)
2485                 SIZECODE2 = 0xff;
2486         else
2487                 SIZECODE2 = 0x80;
2488         raw_cmd->track = TRACK << STRETCH(_floppy);
2489         DR_SELECT = UNIT(current_drive) + PH_HEAD(_floppy,HEAD);
2490         GAP = _floppy->gap;
2491         CODE2SIZE;
2492         SECT_PER_TRACK = _floppy->sect << 2 >> SIZECODE;
2493         SECTOR = ((sector_t % _floppy->sect) << 2 >> SIZECODE) + 1;
2494         tracksize = _floppy->sect - _floppy->sect % ssize;
2495         if (tracksize < _floppy->sect){
2496                 SECT_PER_TRACK ++;
2497                 if (tracksize <= sector_t % _floppy->sect)
2498                         SECTOR--;
2499                 while (tracksize <= sector_t % _floppy->sect){
2500                         while(tracksize + ssize > _floppy->sect){
2501                                 SIZECODE--;
2502                                 ssize >>= 1;
2503                         }
2504                         SECTOR++; SECT_PER_TRACK ++;
2505                         tracksize += ssize;
2506                 }
2507                 max_sector = HEAD * _floppy->sect + tracksize;
2508         } else if (!TRACK && !HEAD && !(_floppy->rate & FD_2M) && probing)
2509                 max_sector = _floppy->sect;
2510 
2511         aligned_sector_t = sector_t - (sector_t % _floppy->sect) % ssize;
2512         max_size = CURRENT->nr_sectors;
2513         if ((raw_cmd->track == buffer_track) && 
2514             (current_drive == buffer_drive) &&
2515             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2516                 /* data already in track buffer */
2517                 if (CT(COMMAND) == FD_READ) {
2518                         copy_buffer(1, max_sector, buffer_max);
2519                         return 1;
2520                 }
2521         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2522                 if (CT(COMMAND) == FD_WRITE){
2523                         if (sector_t + CURRENT->nr_sectors > ssize &&
2524                             sector_t + CURRENT->nr_sectors < ssize + ssize)
2525                                 max_size = ssize + ssize;
2526                         else
2527                                 max_size = ssize;
2528                 }
2529                 raw_cmd->flags &= ~FD_RAW_WRITE;
2530                 raw_cmd->flags |= FD_RAW_READ;
2531                 COMMAND = FM_MODE(_floppy,FD_READ);
2532         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS) {
2533                 unsigned long dma_limit;
2534                 int direct, indirect;
2535 
2536                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2537                         sector_t;
2538 
2539                 /*
2540                  * Do NOT use minimum() here---MAX_DMA_ADDRESS is 64 bits wide
2541                  * on a 64 bit machine!
2542                  */
2543                 max_size = buffer_chain_size();
2544                 dma_limit = (MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer)) >> 9;
2545                 if ((unsigned long) max_size > dma_limit) {
2546                         max_size = dma_limit;
2547                 }
2548                 /* 64 kb boundaries */
2549                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2550                         max_size = (K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2551                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2552                 /*
2553                  * We try to read tracks, but if we get too many errors, we
2554                  * go back to reading just one sector at a time.
2555                  *
2556                  * This means we should be able to read a sector even if there
2557                  * are other bad sectors on this track.
2558                  */
2559                 if (!direct ||
2560                     (indirect * 2 > direct * 3 &&
2561                      *errors < DP->max_errors.read_track &&
2562                      /*!TESTF(FD_NEED_TWADDLE) &&*/
2563                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2564                         max_size = CURRENT->nr_sectors;
2565                 } else {
2566                         raw_cmd->kernel_data = CURRENT->buffer;
2567                         raw_cmd->length = current_count_sectors << 9;
2568                         if (raw_cmd->length == 0){
2569                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2570                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2571                                         indirect, direct, sector_t);
2572                                 return 0;
2573                         }
2574                         return 2;
2575                 }
2576         }
2577 
2578         if (CT(COMMAND) == FD_READ)
2579                 max_size = max_sector; /* unbounded */
2580 
2581         /* claim buffer track if needed */
2582         if (buffer_track != raw_cmd->track ||  /* bad track */
2583             buffer_drive !=current_drive || /* bad drive */
2584             sector_t > buffer_max ||
2585             sector_t < buffer_min ||
2586             ((CT(COMMAND) == FD_READ ||
2587               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize))&&
2588              max_sector > 2 * max_buffer_sectors + buffer_min &&
2589              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2590             /* not enough space */){
2591                 buffer_track = -1;
2592                 buffer_drive = current_drive;
2593                 buffer_max = buffer_min = aligned_sector_t;
2594         }
2595         raw_cmd->kernel_data = floppy_track_buffer + 
2596                 ((aligned_sector_t-buffer_min)<<9);
2597 
2598         if (CT(COMMAND) == FD_WRITE){
2599                 /* copy write buffer to track buffer.
2600                  * if we get here, we know that the write
2601                  * is either aligned or the data already in the buffer
2602                  * (buffer will be overwritten) */
2603 #ifdef FLOPPY_SANITY_CHECK
2604                 if (sector_t != aligned_sector_t && buffer_track == -1)
2605                         DPRINT("internal error offset !=0 on write\n");
2606 #endif
2607                 buffer_track = raw_cmd->track;
2608                 buffer_drive = current_drive;
2609                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2610         } else
2611                 transfer_size(ssize, max_sector,
2612                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2613 
2614         /* round up current_count_sectors to get dma xfer size */
2615         raw_cmd->length = sector_t+current_count_sectors-aligned_sector_t;
2616         raw_cmd->length = ((raw_cmd->length -1)|(ssize-1))+1;
2617         raw_cmd->length <<= 9;
2618 #ifdef FLOPPY_SANITY_CHECK
2619         if ((raw_cmd->length < current_count_sectors << 9) ||
2620             (raw_cmd->kernel_data != CURRENT->buffer &&
2621              CT(COMMAND) == FD_WRITE &&
2622              (aligned_sector_t + (raw_cmd->length >> 9) > buffer_max ||
2623               aligned_sector_t < buffer_min)) ||
2624             raw_cmd->length % (128 << SIZECODE) ||
2625             raw_cmd->length <= 0 || current_count_sectors <= 0){
2626                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2627                         raw_cmd->length, current_count_sectors);
2628                 if (raw_cmd->kernel_data != CURRENT->buffer)
2629                         printk("addr=%d, length=%ld\n",
2630                                (int) ((raw_cmd->kernel_data - 
2631                                        floppy_track_buffer) >> 9),
2632                                current_count_sectors);
2633                 printk("st=%d ast=%d mse=%d msi=%d\n",
2634                        sector_t, aligned_sector_t, max_sector, max_size);
2635                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2636                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2637                        COMMAND, SECTOR, HEAD, TRACK);
2638                 printk("buffer drive=%d\n", buffer_drive);
2639                 printk("buffer track=%d\n", buffer_track);
2640                 printk("buffer_min=%d\n", buffer_min);
2641                 printk("buffer_max=%d\n", buffer_max);
2642                 return 0;
2643         }
2644 
2645         if (raw_cmd->kernel_data != CURRENT->buffer){
2646                 if (raw_cmd->kernel_data < floppy_track_buffer ||
2647                     current_count_sectors < 0 ||
2648                     raw_cmd->length < 0 ||
2649                     raw_cmd->kernel_data + raw_cmd->length >
2650                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2651                         DPRINT("buffer overrun in schedule dma\n");
2652                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2653                                sector_t, buffer_min,
2654                                raw_cmd->length >> 9);
2655                         printk("current_count_sectors=%ld\n",
2656                                current_count_sectors);
2657                         if (CT(COMMAND) == FD_READ)
2658                                 printk("read\n");
2659                         if (CT(COMMAND) == FD_READ)
2660                                 printk("write\n");
2661                         return 0;
2662                 }
2663         } else if (raw_cmd->length > CURRENT->nr_sectors << 9 ||
2664                    current_count_sectors > CURRENT->nr_sectors){
2665                 DPRINT("buffer overrun in direct transfer\n");
2666                 return 0;
2667         } else if (raw_cmd->length < current_count_sectors << 9){
2668                 DPRINT("more sectors than bytes\n");
2669                 printk("bytes=%ld\n", raw_cmd->length >> 9);
2670                 printk("sectors=%ld\n", current_count_sectors);
2671         }
2672         if (raw_cmd->length == 0){
2673                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2674                 return 0;
2675         }
2676 #endif
2677         return 2;
2678 }
2679 
2680 static void redo_fd_request(void)
     /*  */
2681 {
2682 #define REPEAT {request_done(0); continue; }
2683         kdev_t device;
2684         int tmp;
2685 
2686         lastredo = jiffies;
2687         if (current_drive < N_DRIVE)
2688                 floppy_off(current_drive);
2689 
2690         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2691                 CLEAR_INTR;
2692                 unlock_fdc();
2693                 return;
2694         }
2695 
2696         while(1){
2697                 if (!CURRENT) {
2698                         CLEAR_INTR;
2699                         unlock_fdc();
2700                         return;
2701                 }
2702                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2703                         panic(DEVICE_NAME ": request list destroyed");
2704                 if (CURRENT->bh && !buffer_locked(CURRENT->bh))
2705                         panic(DEVICE_NAME ": block not locked");
2706 
2707                 device = CURRENT->rq_dev;
2708                 set_fdc(DRIVE(device));
2709                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2710 
2711                 set_floppy(device);
2712                 raw_cmd = & default_raw_cmd;
2713                 raw_cmd->flags = 0;
2714                 if (start_motor(redo_fd_request)) return;
2715                 if (test_bit(current_drive, &fake_change) ||
2716                    TESTF(FD_DISK_CHANGED)){
2717                         DPRINT("disk absent or changed during operation\n");
2718                         REPEAT;
2719                 }
2720                 if (!_floppy) { /* Autodetection */
2721                         if (!probing){
2722                                 DRS->probed_format = 0;
2723                                 if (next_valid_format()){
2724                                         DPRINT("no autodetectable formats\n");
2725                                         _floppy = NULL;
2726                                         REPEAT;
2727                                 }
2728                         }
2729                         probing = 1;
2730                         _floppy = floppy_type+DP->autodetect[DRS->probed_format];
2731                 } else
2732                         probing = 0;
2733                 errors = & (CURRENT->errors);
2734                 tmp = make_raw_rw_request();
2735                 if (tmp < 2){
2736                         request_done(tmp);
2737                         continue;
2738                 }
2739 
2740                 if (TESTF(FD_NEED_TWADDLE))
2741                         twaddle();
2742                 floppy_tq.routine = (void *)(void *) floppy_start;
2743                 queue_task(&floppy_tq, &tq_timer);
2744 #ifdef DEBUGT
2745                 debugt("queue fd request");
2746 #endif
2747                 return;
2748         }
2749 #undef REPEAT
2750 }
2751 
2752 static struct cont_t rw_cont={
2753         rw_interrupt,
2754         redo_fd_request,
2755         bad_flp_intr,
2756         request_done };
2757 
2758 static struct tq_struct request_tq =
2759 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2760 
2761 static void process_fd_request(void)
     /*  */
2762 {
2763         cont = &rw_cont;
2764         queue_task(&request_tq, &tq_timer);
2765 }
2766 
2767 static void do_fd_request(void)
     /*  */
2768 {
2769         if (fdc_busy){
2770                 /* fdc busy, this new request will be treated when the
2771                    current one is done */
2772                 is_alive("do fd request, old request running");
2773                 return;
2774         }
2775         lock_fdc(MAXTIMEOUT,0);
2776         process_fd_request();
2777         is_alive("do fd request");
2778 }
2779 
2780 static struct cont_t poll_cont={
2781         success_and_wakeup,
2782         floppy_ready,
2783         generic_failure,
2784         generic_done };
2785 
2786 static int poll_drive(int interruptible, int flag)
     /*  */
2787 {
2788         int ret;
2789         /* no auto-sense, just clear dcl */
2790         raw_cmd = &default_raw_cmd;
2791         raw_cmd->flags= flag;
2792         raw_cmd->track=0;
2793         raw_cmd->cmd_count=0;
2794         cont = &poll_cont;
2795 #ifdef DCL_DEBUG
2796         if (DP->flags & FD_DEBUG){
2797                 DPRINT("setting NEWCHANGE in poll_drive\n");
2798         }
2799 #endif
2800         SETF(FD_DISK_NEWCHANGE);
2801         WAIT(floppy_ready);
2802         return ret;
2803 }
2804 
2805 /*
2806  * User triggered reset
2807  * ====================
2808  */
2809 
2810 static void reset_intr(void)
     /*  */
2811 {
2812         printk("weird, reset interrupt called\n");
2813 }
2814 
2815 static struct cont_t reset_cont={
2816         reset_intr,
2817         success_and_wakeup,
2818         generic_failure,
2819         generic_done };
2820 
2821 static int user_reset_fdc(int drive, int arg, int interruptible)
     /*  */
2822 {
2823         int ret;
2824 
2825         ret=0;
2826         LOCK_FDC(drive,interruptible);
2827         if (arg == FD_RESET_ALWAYS)
2828                 FDCS->reset=1;
2829         if (FDCS->reset){
2830                 cont = &reset_cont;
2831                 WAIT(reset_fdc);
2832         }
2833         process_fd_request();
2834         return ret;
2835 }
2836 
2837 /*
2838  * Misc Ioctl's and support
2839  * ========================
2840  */
2841 static int fd_copyout(void *param, const void *address, int size)
     /*  */
2842 {
2843         int ret;
2844 
2845         ECALL(verify_area(VERIFY_WRITE,param,size));
2846         fd_cacheflush(address, size); /* is this necessary ??? */
2847         /* Ralf: Yes; only the l2 cache is completely chipset
2848            controlled */
2849         memcpy_tofs(param,(void *) address, size);
2850         return 0;
2851 }
2852 
2853 static int fd_copyin(void *param, void *address, int size)
     /*  */
2854 {
2855         int ret;
2856 
2857         ECALL(verify_area(VERIFY_READ,param,size));
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 inline 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 = fd_get_dma_residue();
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,*this;
2968 
2969         this = *ptr;
2970         *ptr = 0;
2971         while(this) {
2972                 if (this->buffer_length) {
2973                         free_pages((unsigned long)this->kernel_data,
2974                                    __get_order(this->buffer_length));
2975                         this->buffer_length = 0;
2976                 }
2977                 next = this->next;
2978                 kfree(this);
2979                 this = next;
2980         }
2981 }
2982 
2983 
2984 static inline int raw_cmd_copyin(int cmd, char *param,
     /*  */
2985                                  struct floppy_raw_cmd **rcmd)
2986 {
2987         struct floppy_raw_cmd *ptr;
2988         struct old_floppy_raw_cmd old_raw_cmd;
2989         int ret;
2990         int i;
2991         
2992         *rcmd = 0;
2993         while(1) {
2994                 ptr = (struct floppy_raw_cmd *) 
2995                         kmalloc(sizeof(struct floppy_raw_cmd), GFP_USER);
2996                 if (!ptr)
2997                         return -ENOMEM;
2998                 *rcmd = ptr;
2999                 if (cmd == OLDFDRAWCMD){
3000                         COPYIN(old_raw_cmd);
3001                         ptr->flags = old_raw_cmd.flags;
3002                         ptr->data = old_raw_cmd.data;
3003                         ptr->length = old_raw_cmd.length;
3004                         ptr->rate = old_raw_cmd.rate;
3005                         ptr->cmd_count = old_raw_cmd.cmd_count;
3006                         ptr->track = old_raw_cmd.track;
3007                         ptr->phys_length = 0;
3008                         ptr->next = 0;
3009                         ptr->buffer_length = 0;
3010                         memcpy(ptr->cmd, old_raw_cmd.cmd, 9);
3011                         param += sizeof(struct old_floppy_raw_cmd);
3012                         if (ptr->cmd_count > 9)
3013                                 return -EINVAL;
3014                 } else {
3015                         COPYIN(*ptr);
3016                         ptr->next = 0;
3017                         ptr->buffer_length = 0;
3018                         param += sizeof(struct floppy_raw_cmd);
3019                         if (ptr->cmd_count > 33)
3020                                 /* the command may now also take up the space
3021                                  * initially intended for the reply & the
3022                                  * reply count. Needed for long 82078 commands
3023                                  * such as RESTORE, which takes ... 17 command
3024                                  * bytes. Murphy's law #137: When you reserve
3025                                  * 16 bytes for a structure, you'll one day
3026                                  * discover that you really need 17...
3027                                  */
3028                                 return -EINVAL;
3029                 }
3030 
3031                 for (i=0; i< 16; i++)
3032                         ptr->reply[i] = 0;
3033                 ptr->resultcode = 0;
3034                 ptr->kernel_data = 0;
3035 
3036                 if (ptr->flags & (FD_RAW_READ | FD_RAW_WRITE)) {
3037                         if (ptr->length <= 0)
3038                                 return -EINVAL;
3039                         ptr->kernel_data =(char*)dma_mem_alloc(ptr->length);
3040                         if (!ptr->kernel_data)
3041                                 return -ENOMEM;
3042                         ptr->buffer_length = ptr->length;
3043                 }
3044                 if ( ptr->flags & FD_RAW_READ )
3045                     ECALL( verify_area( VERIFY_WRITE, ptr->data, 
3046                                         ptr->length ));
3047                 if (ptr->flags & FD_RAW_WRITE)
3048                         ECALL(fd_copyin(ptr->data, ptr->kernel_data, 
3049                                         ptr->length));
3050                 rcmd = & (ptr->next);
3051                 if (!(ptr->flags & FD_RAW_MORE))
3052                         return 0;
3053                 ptr->rate &= 0x43;
3054         }
3055 }
3056 
3057 
3058 static int raw_cmd_ioctl(int cmd, void *param)
     /*  */
3059 {
3060         int drive, ret, ret2;
3061         struct floppy_raw_cmd *my_raw_cmd;
3062 
3063         if (FDCS->rawcmd <= 1)
3064                 FDCS->rawcmd = 1;
3065         for (drive= 0; drive < N_DRIVE; drive++){
3066                 if (FDC(drive) != fdc)
3067                         continue;
3068                 if (drive == current_drive){
3069                         if (UDRS->fd_ref > 1){
3070                                 FDCS->rawcmd = 2;
3071                                 break;
3072                         }
3073                 } else if (UDRS->fd_ref){
3074                         FDCS->rawcmd = 2;
3075                         break;
3076                 }
3077         }
3078 
3079         if (FDCS->reset)
3080                 return -EIO;
3081 
3082         ret = raw_cmd_copyin(cmd, param, &my_raw_cmd);
3083         if (ret) {
3084                 raw_cmd_free(&my_raw_cmd);
3085                 return ret;
3086         }
3087 
3088         raw_cmd = my_raw_cmd;
3089         cont = &raw_cmd_cont;
3090         ret=wait_til_done(floppy_start,1);
3091 #ifdef DCL_DEBUG
3092         if (DP->flags & FD_DEBUG){
3093                 DPRINT("calling disk change from raw_cmd ioctl\n");
3094         }
3095 #endif
3096 
3097         if (ret != -EINTR && FDCS->reset)
3098                 ret = -EIO;
3099 
3100         DRS->track = NO_TRACK;
3101 
3102         ret2 = raw_cmd_copyout(cmd, param, my_raw_cmd);
3103         if (!ret)
3104                 ret = ret2;
3105         raw_cmd_free(&my_raw_cmd);
3106         return ret;
3107 }
3108 
3109 static int invalidate_drive(kdev_t rdev)
     /*  */
3110 {
3111         /* invalidate the buffer track to force a reread */
3112         set_bit(DRIVE(rdev), &fake_change);
3113         process_fd_request();
3114         check_disk_change(rdev);
3115         return 0;
3116 }
3117 
3118 
3119 static inline void clear_write_error(int drive)
     /*  */
3120 {
3121         CLEARSTRUCT(UDRWE);
3122 }
3123 
3124 static inline int set_geometry(unsigned int cmd, struct floppy_struct *g,
     /*  */
3125                                int drive, int type, kdev_t device)
3126 {
3127         int cnt;
3128 
3129         /* sanity checking for parameters.*/
3130         if (g->sect <= 0 ||
3131             g->head <= 0 ||
3132             g->track <= 0 ||
3133             g->track > UDP->tracks>>STRETCH(g) ||
3134             /* check if reserved bits are set */
3135             (g->stretch&~(FD_STRETCH|FD_SWAPSIDES)) != 0)
3136                 return -EINVAL;
3137         if (type){
3138                 if (!suser())
3139                         return -EPERM;
3140                 LOCK_FDC(drive,1);
3141                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3142                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3143                             drive_state[cnt].fd_ref)
3144                                 set_bit(drive, &fake_change);
3145                 }
3146                 floppy_type[type] = *g;
3147                 floppy_type[type].name="user format";
3148                 for (cnt = type << 2; cnt < (type << 2) + 4; cnt++)
3149                         floppy_sizes[cnt]= floppy_sizes[cnt+0x80]=
3150                                 floppy_type[type].size>>1;
3151                 process_fd_request();
3152                 for (cnt = 0; cnt < N_DRIVE; cnt++){
3153                         if (ITYPE(drive_state[cnt].fd_device) == type &&
3154                             drive_state[cnt].fd_ref)
3155                                 check_disk_change(
3156                                         MKDEV(FLOPPY_MAJOR,
3157                                               drive_state[cnt].fd_device));
3158                 }
3159         } else {
3160                 LOCK_FDC(drive,1);
3161                 if (cmd != FDDEFPRM)
3162                         /* notice a disk change immediately, else
3163                          * we loose our settings immediately*/
3164                         CALL(poll_drive(1,0));
3165                 user_params[drive] = *g;
3166                 if (buffer_drive == drive)
3167                         SUPBOUND(buffer_max, user_params[drive].sect);
3168                 current_type[drive] = &user_params[drive];
3169                 floppy_sizes[drive] = user_params[drive].size >> 1;
3170                 if (cmd == FDDEFPRM)
3171                         DRS->keep_data = -1;
3172                 else
3173                         DRS->keep_data = 1;
3174                 /* invalidation. Invalidate only when needed, i.e.
3175                  * when there are already sectors in the buffer cache
3176                  * whose number will change. This is useful, because
3177                  * mtools often changes the geometry of the disk after
3178                  * looking at the boot block */
3179                 if (DRS->maxblock > user_params[drive].sect || DRS->maxtrack)
3180                         invalidate_drive(device);
3181                 else
3182                         process_fd_request();
3183         }
3184         return 0;
3185 }
3186 
3187 /* handle obsolete ioctl's */
3188 static struct translation_entry {
3189     int newcmd;
3190     int oldcmd;
3191     int oldsize; /* size of 0x00xx-style ioctl. Reflects old structures, thus
3192                   * use numeric values. NO SIZEOFS */
3193 } translation_table[]= {
3194     {FDCLRPRM,           0,  0},
3195     {FDSETPRM,           1, 28},
3196     {FDDEFPRM,           2, 28},
3197     {FDGETPRM,           3, 28},
3198     {FDMSGON,            4,  0},
3199     {FDMSGOFF,           5,  0},
3200     {FDFMTBEG,           6,  0},
3201     {FDFMTTRK,           7, 12},
3202     {FDFMTEND,           8,  0},
3203     {FDSETEMSGTRESH,    10,  0},
3204     {FDFLUSH,           11,  0},
3205     {FDSETMAXERRS,      12, 20},
3206     {OLDFDRAWCMD,       30,  0},
3207     {FDGETMAXERRS,      14, 20},
3208     {FDGETDRVTYP,       16, 16},
3209     {FDSETDRVPRM,       20, 88},
3210     {FDGETDRVPRM,       21, 88},
3211     {FDGETDRVSTAT,      22, 52},
3212     {FDPOLLDRVSTAT,     23, 52},
3213     {FDRESET,           24,  0},
3214     {FDGETFDCSTAT,      25, 40},
3215     {FDWERRORCLR,       27,  0},
3216     {FDWERRORGET,       28, 24},
3217     {FDRAWCMD,           0,  0},
3218     {FDEJECT,            0,  0},
3219     {FDTWADDLE,         40,  0} };
3220 
3221 static inline int normalize_0x02xx_ioctl(int *cmd, int *size)
     /*  */
3222 {
3223         int i;
3224 
3225         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3226                 if ((*cmd & 0xffff) == (translation_table[i].newcmd & 0xffff)){
3227                         *size = _IOC_SIZE(*cmd);
3228                         *cmd = translation_table[i].newcmd;
3229                         if (*size > _IOC_SIZE(*cmd)) {
3230                                 printk("ioctl not yet supported\n");
3231                                 return -EFAULT;
3232                         }
3233                         return 0;
3234                 }
3235         }
3236         return -EINVAL;
3237 }
3238 
3239 static inline int xlate_0x00xx_ioctl(int *cmd, int *size)
     /*  */
3240 {
3241         int i;
3242         /* old ioctls' for kernels <= 1.3.33 */
3243         /* When the next even release will come around, we'll start
3244          * warning against these.
3245          * When the next odd release will come around, we'll fail with
3246          * -EINVAL */
3247         if(strcmp(system_utsname.version, "1.4.0") >= 0)
3248                 printk("obsolete floppy ioctl %x\n", *cmd);
3249         if((system_utsname.version[0] == '1' &&
3250             strcmp(system_utsname.version, "1.5.0") >= 0) ||
3251            (system_utsname.version[0] >= '2' &&
3252             strcmp(system_utsname.version, "2.1.0") >= 0))
3253                 return -EINVAL;
3254         for (i=0; i < ARRAY_SIZE(translation_table); i++) {
3255                 if (*cmd == translation_table[i].oldcmd) {
3256                         *size = translation_table[i].oldsize;
3257                         *cmd = translation_table[i].newcmd;
3258                         return 0;
3259                 }
3260         }
3261         return -EINVAL;
3262 }
3263 
3264 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /*  */
3265                     unsigned long param)
3266 {
3267 #define IOCTL_MODE_BIT 8
3268 #define OPEN_WRITE_BIT 16
3269 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
3270 #define OUT(c,x) case c: outparam = (const char *) (x); break
3271 #define IN(c,x,tag) case c: *(x) = inparam. tag ; return 0
3272 
3273         int i,drive,type;
3274         kdev_t device;
3275         int ret;
3276         int size;
3277         union inparam {
3278                 struct floppy_struct g; /* geometry */
3279                 struct format_descr f;
3280                 struct floppy_max_errors max_errors;
3281                 struct floppy_drive_params dp;
3282         } inparam; /* parameters coming from user space */
3283         const char *outparam; /* parameters passed back to user space */
3284 
3285         device = inode->i_rdev;
3286         switch (cmd) {
3287                 RO_IOCTLS(device,param);
3288         }
3289         type = TYPE(device);
3290         drive = DRIVE(device);
3291 
3292         /* convert compatibility eject ioctls into floppy eject ioctl.
3293          * We do this in order to provide a means to eject floppy disks before
3294          * installing the new fdutils package */
3295         if(cmd == CDROMEJECT || /* CD-Rom eject */
3296            cmd == 0x6470 /* SunOS floppy eject */) {
3297                 DPRINT("obsolete eject ioctl\n");
3298                 DPRINT("please use floppycontrol --eject\n");
3299                 cmd = FDEJECT;
3300         }
3301 
3302         /* convert the old style command into a new style command */
3303         if ((cmd & 0xff00) == 0x0200) {
3304                 ECALL(normalize_0x02xx_ioctl(&cmd, &size));
3305         } else if ((cmd & 0xff00) == 0x0000) {
3306                 ECALL(xlate_0x00xx_ioctl(&cmd, &size));
3307         } else
3308                 return -EINVAL;
3309 
3310         /* permission checks */
3311         if (((cmd & 0x80) && !suser()) ||
3312              ((cmd & 0x40) && !IOCTL_ALLOWED))
3313                 return -EPERM;
3314 
3315         /* verify writability of result, and fail early */
3316         if (_IOC_DIR(cmd) & _IOC_READ)
3317                 ECALL(verify_area(VERIFY_WRITE,(void *) param, size));
3318                 
3319         /* copyin */
3320         CLEARSTRUCT(&inparam);
3321         if (_IOC_DIR(cmd) & _IOC_WRITE)
3322                 ECALL(fd_copyin((void *)param, &inparam, size))
3323 
3324         switch (cmd) {
3325                 case FDEJECT:
3326                         if(UDRS->fd_ref != 1)
3327                                 /* somebody else has this drive open */
3328                                 return -EBUSY;
3329                         LOCK_FDC(drive,1);
3330 
3331                         /* do the actual eject. Fails on
3332                          * non-Sparc architectures */
3333                         ret=fd_eject(UNIT(drive)); 
3334 
3335                         /* switch the motor off, in order to make the
3336                          * cached DOR status match the hard DOS status
3337                          */
3338                         motor_off_callback(drive);
3339 
3340                         USETF(FD_DISK_CHANGED);
3341                         USETF(FD_VERIFY);
3342                         process_fd_request();
3343                         return ret;                     
3344                 case FDCLRPRM:
3345                         LOCK_FDC(drive,1);
3346                         current_type[drive] = NULL;
3347                         floppy_sizes[drive] = MAX_DISK_SIZE;
3348                         UDRS->keep_data = 0;
3349                         return invalidate_drive(device);
3350                 case FDSETPRM:
3351                 case FDDEFPRM:
3352                         return set_geometry(cmd, & inparam.g,
3353                                             drive, type, device);
3354                 case FDGETPRM:
3355                         if (type)
3356                                 outparam = (char *) &floppy_type[type];
3357                         else 
3358                                 outparam = (char *) current_type[drive];
3359                         if(!outparam)
3360                                 return -ENODEV;
3361                         break;
3362 
3363                 case FDMSGON:
3364                         UDP->flags |= FTD_MSG;
3365                         return 0;
3366                 case FDMSGOFF:
3367                         UDP->flags &= ~FTD_MSG;
3368                         return 0;
3369 
3370                 case FDFMTBEG:
3371                         LOCK_FDC(drive,1);
3372                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3373                         ret = UDRS->flags;
3374                         process_fd_request();
3375                         if(ret & FD_VERIFY)
3376                                 return -ENODEV;
3377                         if(!(ret & FD_DISK_WRITABLE))
3378                                 return -EROFS;
3379                         return 0;
3380                 case FDFMTTRK:
3381                         if (UDRS->fd_ref != 1)
3382                                 return -EBUSY;
3383                         return do_format(device, &inparam.f);
3384                 case FDFMTEND:
3385                 case FDFLUSH:
3386                         LOCK_FDC(drive,1);
3387                         return invalidate_drive(device);
3388 
3389                 case FDSETEMSGTRESH:
3390                         UDP->max_errors.reporting =
3391                                 (unsigned short) (param & 0x0f);
3392                         return 0;
3393                 OUT(FDGETMAXERRS, &UDP->max_errors);
3394                 IN(FDSETMAXERRS, &UDP->max_errors, max_errors);
3395 
3396                 case FDGETDRVTYP:
3397                         outparam = drive_name(type,drive);
3398                         SUPBOUND(size,strlen(outparam)+1);
3399                         break;
3400 
3401                 IN(FDSETDRVPRM, UDP, dp);
3402                 OUT(FDGETDRVPRM, UDP);
3403 
3404                 case FDPOLLDRVSTAT:
3405                         LOCK_FDC(drive,1);
3406                         CALL(poll_drive(1, FD_RAW_NEED_DISK));
3407                         process_fd_request();
3408                         /* fall through */
3409                 OUT(FDGETDRVSTAT, UDRS);
3410 
3411                 case FDRESET:
3412                         return user_reset_fdc(drive, (int)param, 1);
3413 
3414                 OUT(FDGETFDCSTAT,UFDCS);
3415 
3416                 case FDWERRORCLR:
3417                         CLEARSTRUCT(UDRWE);
3418                         return 0;
3419                 OUT(FDWERRORGET,UDRWE);
3420 
3421                 case OLDFDRAWCMD:
3422                 case FDRAWCMD:
3423                         if (type)
3424                                 return -EINVAL;
3425                         LOCK_FDC(drive,1);
3426                         set_floppy(device);
3427                         CALL(i = raw_cmd_ioctl(cmd,(void *) param));
3428                         process_fd_request();
3429                         return i;
3430 
3431                 case FDTWADDLE:
3432                         LOCK_FDC(drive,1);
3433                         twaddle();
3434                         process_fd_request();
3435                         return 0;
3436 
3437                 default:
3438                         return -EINVAL;
3439         }
3440 
3441         if (_IOC_DIR(cmd) & _IOC_READ)
3442                 return fd_copyout((void *)param, outparam, size);
3443         else
3444                 return 0;
3445 #undef IOCTL_ALLOWED
3446 #undef OUT
3447 #undef IN
3448 }
3449 
3450 static void config_types(void)
     /*  */
3451 {
3452         int first=1;
3453         int drive;
3454 
3455         /* read drive info out of physical cmos */
3456         drive=0;
3457         if (!UDP->cmos)
3458                 UDP->cmos= FLOPPY0_TYPE;
3459         drive=1;
3460         if (!UDP->cmos && FLOPPY1_TYPE)
3461                 UDP->cmos = FLOPPY1_TYPE;
3462 
3463         /* XXX */
3464         /* additional physical CMOS drive detection should go here */
3465 
3466         for (drive=0; drive < N_DRIVE; drive++){
3467                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3468                         memcpy((char *) UDP,
3469                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3470                                sizeof(struct floppy_drive_params));
3471                 if (UDP->cmos){
3472                         if (first)
3473                                 printk(KERN_INFO "Floppy drive(s): ");
3474                         else
3475                                 printk(", ");
3476                         first=0;
3477                         if (UDP->cmos > 0){
3478                                 allowed_drive_mask |= 1 << drive;
3479                                 printk("fd%d is %s", drive,
3480                                        default_drive_params[(int)UDP->cmos].name);
3481                         } else
3482                                 printk("fd%d is unknown type %d",drive,
3483                                        UDP->cmos);
3484                 }
3485         }
3486         if (!first)
3487                 printk("\n");
3488 }
3489 
3490 static int floppy_read(struct inode * inode, struct file * filp,
     /*  */
3491                        char * buf, int count)
3492 {
3493         int drive = DRIVE(inode->i_rdev);
3494 
3495         check_disk_change(inode->i_rdev);
3496         if (UTESTF(FD_DISK_CHANGED))
3497                 return -ENXIO;
3498         return block_read(inode, filp, buf, count);
3499 }
3500 
3501 static int floppy_write(struct inode * inode, struct file * filp,
     /*  */
3502                         const char * buf, int count)
3503 {
3504         int block;
3505         int ret;
3506         int drive = DRIVE(inode->i_rdev);
3507 
3508         if (!UDRS->maxblock)
3509                 UDRS->maxblock=1;/* make change detectable */
3510         check_disk_change(inode->i_rdev);
3511         if (UTESTF(FD_DISK_CHANGED))
3512                 return -ENXIO;
3513         if (!UTESTF(FD_DISK_WRITABLE))
3514                 return -EROFS;
3515         block = (filp->f_pos + count) >> 9;
3516         INFBOUND(UDRS->maxblock, block);
3517         ret= block_write(inode, filp, buf, count);
3518         return ret;
3519 }
3520 
3521 static void floppy_release(struct inode * inode, struct file * filp)
     /*  */
3522 {
3523         int drive;
3524 
3525         drive = DRIVE(inode->i_rdev);
3526 
3527         if (!filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3528                 /* if the file is mounted OR (writable now AND writable at
3529                  * open time) Linus: Does this cover all cases? */
3530                 block_fsync(inode,filp);
3531 
3532         if (UDRS->fd_ref < 0)
3533                 UDRS->fd_ref=0;
3534         else if (!UDRS->fd_ref--) {
3535                 DPRINT("floppy_release with fd_ref == 0");
3536                 UDRS->fd_ref = 0;
3537         }
3538         floppy_release_irq_and_dma();
3539 }
3540 
3541 /*
3542  * floppy_open check for aliasing (/dev/fd0 can be the same as
3543  * /dev/PS0 etc), and disallows simultaneous access to the same
3544  * drive with different device numbers.
3545  */
3546 #define RETERR(x) do{floppy_release(inode,filp); return -(x);}while(0)
3547 
3548 static int floppy_open(struct inode * inode, struct file * filp)
     /*  */
3549 {
3550         int drive;
3551         int old_dev;
3552         int try;
3553         char *tmp;
3554 
3555         if (!filp) {
3556                 DPRINT("Weird, open called with filp=0\n");
3557                 return -EIO;
3558         }
3559 
3560         drive = DRIVE(inode->i_rdev);
3561         if (drive >= N_DRIVE ||
3562             !(allowed_drive_mask & (1 << drive)) ||
3563             fdc_state[FDC(drive)].version == FDC_NONE)
3564                 return -ENXIO;
3565 
3566         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3567                 return -ENXIO;
3568         old_dev = UDRS->fd_device;
3569         if (UDRS->fd_ref && old_dev != MINOR(inode->i_rdev))
3570                 return -EBUSY;
3571 
3572         if (!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3573                 USETF(FD_DISK_CHANGED);
3574                 USETF(FD_VERIFY);
3575         }
3576 
3577         if (UDRS->fd_ref == -1 ||
3578            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3579                 return -EBUSY;
3580 
3581         if (floppy_grab_irq_and_dma())
3582                 return -EBUSY;
3583 
3584         if (filp->f_flags & O_EXCL)
3585                 UDRS->fd_ref = -1;
3586         else
3587                 UDRS->fd_ref++;
3588 
3589         if (!floppy_track_buffer){
3590                 /* if opening an ED drive, reserve a big buffer,
3591                  * else reserve a small one */
3592                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3593                         try = 64; /* Only 48 actually useful */
3594                 else
3595                         try = 32; /* Only 24 actually useful */
3596 
3597                 tmp=(char *)dma_mem_alloc(1024 * try);
3598                 if (!tmp) {
3599                         try >>= 1; /* buffer only one side */
3600                         INFBOUND(try, 16);
3601                         tmp= (char *)dma_mem_alloc(1024*try);
3602                 }
3603                 if (!tmp) {
3604                         DPRINT("Unable to allocate DMA memory\n");
3605                         RETERR(ENXIO);
3606                 }
3607                 if (floppy_track_buffer){
3608                         free_pages((unsigned long)tmp,__get_order(try*1024));
3609                 }else {
3610                         buffer_min = buffer_max = -1;
3611                         floppy_track_buffer = tmp;
3612                         max_buffer_sectors = try;
3613                 }
3614         }
3615 
3616         UDRS->fd_device = MINOR(inode->i_rdev);
3617         if (old_dev != -1 && old_dev != MINOR(inode->i_rdev)) {
3618                 if (buffer_drive == drive)
3619                         buffer_track = -1;
3620                 invalidate_buffers(MKDEV(FLOPPY_MAJOR,old_dev));
3621         }
3622 
3623         /* Allow ioctls if we have write-permissions even if read-only open */
3624         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3625                 filp->f_mode |= IOCTL_MODE_BIT;
3626         if (filp->f_mode & 2)
3627                 filp->f_mode |= OPEN_WRITE_BIT;
3628 
3629         if (UFDCS->rawcmd == 1)
3630                 UFDCS->rawcmd = 2;
3631 
3632         if (filp->f_flags & O_NDELAY)
3633                 return 0;
3634         if (filp->f_mode & 3) {
3635                 UDRS->last_checked = 0;
3636                 check_disk_change(inode->i_rdev);
3637                 if (UTESTF(FD_DISK_CHANGED))
3638                         RETERR(ENXIO);
3639         }
3640         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3641                 RETERR(EROFS);
3642         return 0;
3643 #undef RETERR
3644 }
3645 
3646 /*
3647  * Check if the disk has been changed or if a change has been faked.
3648  */
3649 static int check_floppy_change(kdev_t dev)
     /*  */
3650 {
3651         int drive = DRIVE(dev);
3652 
3653         if (MAJOR(dev) != MAJOR_NR) {
3654                 DPRINT("check_floppy_change: not a floppy\n");
3655                 return 0;
3656         }
3657 
3658         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3659                 return 1;
3660 
3661         if (UDRS->last_checked + UDP->checkfreq < jiffies){
3662                 lock_fdc(drive,0);
3663                 poll_drive(0,0);
3664                 process_fd_request();
3665         }
3666 
3667         if (UTESTF(FD_DISK_CHANGED) ||
3668            UTESTF(FD_VERIFY) ||
3669            test_bit(drive, &fake_change) ||
3670            (!TYPE(dev) && !current_type[drive]))
3671                 return 1;
3672         return 0;
3673 }
3674 
3675 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3676  * the bootblock (block 0). "Autodetection" is also needed to check whether
3677  * there is a disk in the drive at all... Thus we also do it for fixed
3678  * geometry formats */
3679 static int floppy_revalidate(kdev_t dev)
     /*  */
3680 {
3681 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3682         struct buffer_head * bh;
3683         int drive=DRIVE(dev);
3684         int cf;
3685 
3686         if (UTESTF(FD_DISK_CHANGED) ||
3687            UTESTF(FD_VERIFY) ||
3688            test_bit(drive, &fake_change) ||
3689            NO_GEOM){
3690                 lock_fdc(drive,0);
3691                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3692                 if (!(cf || test_bit(drive, &fake_change) || NO_GEOM)){
3693                         process_fd_request(); /*already done by another thread*/
3694                         return 0;
3695                 }
3696                 UDRS->maxblock = 0;
3697                 UDRS->maxtrack = 0;
3698                 if (buffer_drive == drive)
3699                         buffer_track = -1;
3700                 clear_bit(drive, &fake_change);
3701                 UCLEARF(FD_DISK_CHANGED);
3702                 if (cf)
3703                         UDRS->generation++;
3704                 if (NO_GEOM){
3705                         /* auto-sensing */
3706                         int size = floppy_blocksizes[MINOR(dev)];
3707                         if (!size)
3708                                 size = 1024;
3709                         if (!(bh = getblk(dev,0,size))){
3710                                 process_fd_request();
3711                                 return 1;
3712                         }
3713                         if (bh && !buffer_uptodate(bh))
3714                                 ll_rw_block(READ, 1, &bh);
3715                         process_fd_request();
3716                         wait_on_buffer(bh);
3717                         brelse(bh);
3718                         return 0;
3719                 }
3720                 if (cf)
3721                         poll_drive(0, FD_RAW_NEED_DISK);
3722                 process_fd_request();
3723         }
3724         return 0;
3725 }
3726 
3727 static struct file_operations floppy_fops = {
3728         NULL,                   /* lseek - default */
3729         floppy_read,            /* read - general block-dev read */
3730         floppy_write,           /* write - general block-dev write */
3731         NULL,                   /* readdir - bad */
3732         NULL,                   /* select */
3733         fd_ioctl,               /* ioctl */
3734         NULL,                   /* mmap */
3735         floppy_open,            /* open */
3736         floppy_release,         /* release */
3737         block_fsync,            /* fsync */
3738         NULL,                   /* fasync */
3739         check_floppy_change,    /* media_change */
3740         floppy_revalidate,      /* revalidate */
3741 };
3742 
3743 /*
3744  * Floppy Driver initialisation
3745  * =============================
3746  */
3747 
3748 /* Determine the floppy disk controller type */
3749 /* This routine was written by David C. Niemi */
3750 static char get_fdc_version(void)
     /*  */
3751 {
3752         int r;
3753 
3754         FDCS->has_fifo = 0;
3755         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3756         if (FDCS->reset)
3757                 return FDC_NONE;
3758         if ((r = result()) <= 0x00)
3759                 return FDC_NONE;        /* No FDC present ??? */
3760         if ((r==1) && (reply_buffer[0] == 0x80)){
3761                 printk(KERN_INFO "FDC %d is an 8272A\n",fdc);
3762                 return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
3763         }
3764         if (r != 10) {
3765                 printk("FDC %d init: DUMPREGS: unexpected return of %d bytes.\n",
3766                        fdc, r);
3767                 return FDC_UNKNOWN;
3768         }
3769         output_byte(FD_VERSION);
3770         r = result();
3771         if ((r == 1) && (reply_buffer[0] == 0x80)){
3772                 printk(KERN_INFO "FDC %d is an 82072\n",fdc);
3773                 return FDC_82072;               /* 82072 doesn't know VERSION */
3774         }
3775         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3776                 printk("FDC %d init: VERSION: unexpected return of %d bytes.\n",
3777                        fdc, r);
3778                 return FDC_UNKNOWN;
3779         }
3780         FDCS->has_fifo = fdc_configure();
3781         output_byte(FD_PERPENDICULAR);
3782         if(need_more_output() == MORE_OUTPUT) {
3783                 output_byte(0);
3784         } else {
3785                 printk(KERN_INFO "FDC %d is an 82072A\n", fdc);
3786                 return FDC_82072A;      /* 82072A as found on Sparcs. */
3787         }
3788 
3789         output_byte(FD_UNLOCK);
3790         r = result();
3791         if ((r == 1) && (reply_buffer[0] == 0x80)){
3792                 printk(KERN_INFO "FDC %d is a pre-1991 82077\n", fdc);
3793                 return FDC_82077_ORIG;  /* Pre-1991 82077, doesn't know 
3794                                          * LOCK/UNLOCK */
3795         }
3796         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3797                 printk("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
3798                        fdc, r);
3799                 return FDC_UNKNOWN;
3800         }
3801         output_byte(FD_PARTID);
3802         r = result();
3803         if (r != 1) {
3804                 printk("FDC %d init: PARTID: unexpected return of %d bytes.\n",
3805                        fdc, r);
3806                 return FDC_UNKNOWN;
3807         }
3808         if (reply_buffer[0] == 0x80) {
3809                 printk(KERN_INFO "FDC %d is a post-1991 82077\n",fdc);
3810                 return FDC_82077;       /* Revised 82077AA passes all the tests */
3811         }
3812         switch (reply_buffer[0] >> 5) {
3813                 case 0x0:
3814                         output_byte(FD_SAVE);
3815                         r = result();
3816                         if (r != 16) {
3817                                 printk("FDC %d init: SAVE: unexpected return of %d bytes.\n", fdc, r);
3818                                 return FDC_UNKNOWN;
3819                         }
3820                         if (!(reply_buffer[0] & 0x40)) {
3821                                 printk(KERN_INFO "FDC %d is a 3Volt 82078SL.\n",fdc);
3822                                 return FDC_82078;
3823                         }
3824                         /* Either a 82078-1 or a 82078SL running at 5Volt */
3825                         printk(KERN_INFO "FDC %d is an 82078-1.\n",fdc);
3826                         return FDC_82078_1;
3827                 case 0x1:
3828                         printk(KERN_INFO "FDC %d is a 44pin 82078\n",fdc);
3829                         return FDC_82078;
3830                 case 0x2:
3831                         printk(KERN_INFO "FDC %d is a S82078B\n", fdc);
3832                         return FDC_S82078B;
3833                 case 0x3:
3834                         printk(KERN_INFO "FDC %d is a National Semiconductor PC87306\n", fdc);
3835                         return FDC_87306;
3836                 default:
3837                         printk(KERN_INFO "FDC %d init: 82078 variant with unknown PARTID=%d.\n",
3838                                fdc, reply_buffer[0] >> 5);
3839                         return FDC_82078_UNKN;
3840         }
3841 } /* get_fdc_version */
3842 
3843 /* lilo configuration */
3844 
3845 /* we make the invert_dcl function global. One day, somebody might
3846  * want to centralize all thinkpad related options into one lilo option,
3847  * there are just so many thinkpad related quirks! */
3848 void floppy_invert_dcl(int *ints,int param)
     /*  */
3849 {
3850         int i;
3851 
3852         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3853                 if (param)
3854                         default_drive_params[i].params.flags |= 0x80;
3855                 else
3856                         default_drive_params[i].params.flags &= ~0x80;
3857         }
3858         DPRINT("Configuring drives for inverted dcl\n");
3859 }
3860 
3861 static void daring(int *ints,int param)
     /*  */
3862 {
3863         int i;
3864 
3865         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3866                 if (param){
3867                         default_drive_params[i].params.select_delay = 0;
3868                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3869                 } else {
3870                         default_drive_params[i].params.select_delay = 2*HZ/100;
3871                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3872                 }
3873         }
3874         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3875 }
3876 
3877 static void set_cmos(int *ints, int dummy)
     /*  */
3878 {
3879         int current_drive=0;
3880 
3881         if (ints[0] != 2){
3882                 DPRINT("wrong number of parameter for cmos\n");
3883                 return;
3884         }
3885         current_drive = ints[1];
3886         if (current_drive < 0 || current_drive >= 8){
3887                 DPRINT("bad drive for set_cmos\n");
3888                 return;
3889         }
3890         if (current_drive >= 4 && !FDC2)
3891                 FDC2 = 0x370;
3892         if (ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3893                 DPRINT1("bad cmos code %d\n", ints[2]);
3894                 return;
3895         }
3896         DP->cmos = ints[2];
3897         DPRINT1("setting cmos code to %d\n", ints[2]);
3898 }
3899 
3900 static struct param_table {
3901         const char *name;
3902         void (*fn)(int *ints, int param);
3903         int *var;
3904         int def_param;
3905 } config_params[]={
3906         { "allowed_drive_mask", 0, &allowed_drive_mask, 0xff },
3907         { "all_drives", 0, &allowed_drive_mask, 0xff },
3908         { "asus_pci", 0, &allowed_drive_mask, 0x33 },
3909 
3910         { "daring", daring, 0, 1},
3911 
3912         { "two_fdc",  0, &FDC2, 0x370 },
3913         { "one_fdc", 0, &FDC2, 0 },
3914 
3915         { "thinkpad", floppy_invert_dcl, 0, 1 },
3916 
3917         { "nodma", 0, &use_virtual_dma, 1 },
3918         { "omnibook", 0, &use_virtual_dma, 1 },
3919         { "dma", 0, &use_virtual_dma, 0 },
3920 
3921         { "fifo", 0, &fifo, 0xa },
3922 
3923         { "cmos", set_cmos, 0, 0 },
3924 
3925         { "unexpected_interrupts", 0, &print_unex, 1 },
3926         { "no_unexpected_interrupts", 0, &print_unex, 0 },
3927         { "L40SX", 0, &print_unex, 0 } };
3928 
3929 #define FLOPPY_SETUP
3930 void floppy_setup(char *str, int *ints)
     /*  */
3931 {
3932         int i;
3933         int param;
3934         if (str)
3935                 for (i=0; i< ARRAY_SIZE(config_params); i++){
3936                         if (strcmp(str,config_params[i].name) == 0){
3937                                 if (ints[0])
3938                                         param = ints[1];
3939                                 else
3940                                         param = config_params[i].def_param;
3941                                 if(config_params[i].fn)
3942                                         config_params[i].fn(ints,param);
3943                                 if(config_params[i].var) {
3944                                         DPRINT2("%s=%d\n", str, param);
3945                                         *config_params[i].var = param;
3946                                 }
3947                                 return;
3948                         }
3949                 }
3950         if (str) {
3951                 DPRINT1("unknown floppy option [%s]\n", str);
3952                 
3953                 DPRINT("allowed options are:");
3954                 for (i=0; i< ARRAY_SIZE(config_params); i++)
3955                         printk(" %s",config_params[i].name);
3956                 printk("\n");
3957         } else
3958                 DPRINT("botched floppy option\n");
3959         DPRINT("Read linux/drivers/block/README.fd\n");
3960 }
3961 
3962 int floppy_init(void)
     /*  */
3963 {
3964         int i,unit,drive;
3965         int have_no_fdc= -EIO;
3966 
3967         raw_cmd = 0;
3968 
3969         sti();
3970 
3971         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3972                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3973                 return -EBUSY;
3974         }
3975 
3976         for (i=0; i<256; i++)
3977                 if (ITYPE(i))
3978                         floppy_sizes[i] = floppy_type[ITYPE(i)].size >> 1;
3979                 else
3980                         floppy_sizes[i] = MAX_DISK_SIZE;
3981 
3982         blk_size[MAJOR_NR] = floppy_sizes;
3983         blksize_size[MAJOR_NR] = floppy_blocksizes;
3984         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3985         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3986 #ifdef __sparc__
3987         fdc_cfg = (0x40 | 0x10); /* ImplSeek+Polling+FIFO */
3988 #endif
3989         config_types();
3990 
3991         for (i = 0; i < N_FDC; i++) {
3992                 fdc = i;
3993                 CLEARSTRUCT(FDCS);
3994                 FDCS->dtr = -1;
3995                 FDCS->dor = 0x4;
3996         }
3997 
3998         fdc_state[0].address = FDC1;
3999 #if N_FDC > 1
4000         fdc_state[1].address = FDC2;
4001 #endif
4002 
4003         if (floppy_grab_irq_and_dma()){
4004                 unregister_blkdev(MAJOR_NR,"fd");
4005                 return -EBUSY;
4006         }
4007 
4008         /* initialise drive state */
4009         for (drive = 0; drive < N_DRIVE; drive++) {
4010                 CLEARSTRUCT(UDRS);
4011                 CLEARSTRUCT(UDRWE);
4012                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
4013                 UDRS->fd_device = -1;
4014                 floppy_track_buffer = NULL;
4015                 max_buffer_sectors = 0;
4016         }
4017 
4018         for (i = 0; i < N_FDC; i++) {
4019                 fdc = i;
4020                 FDCS->driver_version = FD_DRIVER_VERSION;
4021                 for (unit=0; unit<4; unit++)
4022                         FDCS->track[unit] = 0;
4023                 if (FDCS->address == -1)
4024                         continue;
4025                 FDCS->rawcmd = 2;
4026                 if (user_reset_fdc(-1,FD_RESET_ALWAYS,0)){
4027                         FDCS->address = -1;
4028                         continue;
4029                 }
4030                 /* Try to determine the floppy controller type */
4031                 FDCS->version = get_fdc_version();
4032                 if (FDCS->version == FDC_NONE){
4033                         FDCS->address = -1;
4034                         continue;
4035                 }
4036 
4037                 request_region(FDCS->address, 6, "floppy");
4038                 request_region(FDCS->address+7, 1, "floppy DIR");
4039                 /* address + 6 is reserved, and may be taken by IDE.
4040                  * Unfortunately, Adaptec doesn't know this :-(, */
4041 
4042                 have_no_fdc = 0;
4043                 /* Not all FDCs seem to be able to handle the version command
4044                  * properly, so force a reset for the standard FDC clones,
4045                  * to avoid interrupt garbage.
4046                  */
4047                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
4048         }
4049         fdc=0;
4050         del_timer(&fd_timeout);
4051         current_drive = 0;
4052         floppy_release_irq_and_dma();
4053         initialising=0;
4054         if (have_no_fdc) {
4055                 DPRINT("no floppy controllers found\n");
4056                 unregister_blkdev(MAJOR_NR,"fd");
4057         } else
4058                 virtual_dma_init();
4059         return have_no_fdc;
4060 }
4061 
4062 static int floppy_grab_irq_and_dma(void)
     /*  */
4063 {
4064         int i;
4065         cli();
4066         if (usage_count++){
4067                 sti();
4068                 return 0;
4069         }
4070         sti();
4071         MOD_INC_USE_COUNT;
4072         for (i=0; i< N_FDC; i++){
4073                 if (FDCS->address != -1){
4074                         fdc = i;
4075                         reset_fdc_info(1);
4076                         fd_outb(FDCS->dor, FD_DOR);
4077                 }
4078         }
4079         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
4080 
4081         if (fd_request_irq()) {
4082                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
4083                         FLOPPY_IRQ);
4084                 return -1;
4085         }
4086         if (fd_request_dma()) {
4087                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
4088                         FLOPPY_DMA);
4089                 fd_free_irq();
4090                 return -1;
4091         }
4092         for (fdc = 0; fdc < N_FDC; fdc++)
4093                 if (FDCS->address != -1)
4094                         fd_outb(FDCS->dor, FD_DOR);
4095         fdc = 0;
4096         fd_enable_irq();
4097         return 0;
4098 }
4099 
4100 static void floppy_release_irq_and_dma(void)
     /*  */
4101 {
4102 #ifdef FLOPPY_SANITY_CHECK
4103         int drive;
4104 #endif
4105         long tmpsize;
4106         void *tmpaddr;
4107 
4108         cli();
4109         if (--usage_count){
4110                 sti();
4111                 return;
4112         }
4113         sti();
4114         MOD_DEC_USE_COUNT;
4115         fd_disable_dma();
4116         fd_free_dma();
4117         fd_disable_irq();
4118         fd_free_irq();
4119 
4120         set_dor(0, ~0, 8);
4121 #if N_FDC > 1
4122         set_dor(1, ~8, 0);
4123 #endif
4124         floppy_enable_hlt();
4125 
4126         if (floppy_track_buffer && max_buffer_sectors) {
4127                 tmpsize = max_buffer_sectors*1024;
4128                 tmpaddr = (void *)floppy_track_buffer;
4129                 floppy_track_buffer = 0;
4130                 max_buffer_sectors = 0;
4131                 buffer_min = buffer_max = -1;
4132                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
4133         }
4134 
4135 #ifdef FLOPPY_SANITY_CHECK
4136         for (drive=0; drive < N_FDC * 4; drive++)
4137                 if (motor_off_timer[drive].next)
4138                         printk("motor off timer %d still active\n", drive);
4139 
4140         if (fd_timeout.next)
4141                 printk("floppy timer still active:%s\n", timeout_message);
4142         if (fd_timer.next)
4143                 printk("auxiliary floppy timer still active\n");
4144         if (floppy_tq.sync)
4145                 printk("task queue still active\n");
4146 #endif
4147 }
4148 
4149 
4150 #ifdef MODULE
4151 
4152 extern char *get_options(char *str, int *ints);
4153 
4154 char *floppy=NULL;
4155 
4156 static void parse_floppy_cfg_string(char *cfg)
     /*  */
4157 {
4158         char *ptr;
4159         int ints[11];
4160 
4161         while(*cfg) {
4162                 for(ptr = cfg;*cfg && *cfg != ' ' && *cfg != '\t'; cfg++);
4163                 if(*cfg) {
4164                         *cfg = '\0';
4165                         cfg++;
4166                 }
4167                 if(*ptr)
4168                         floppy_setup(get_options(ptr,ints),ints);
4169         }
4170 }
4171 
4172 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /*  */
4173 {
4174         unsigned long i;
4175         char c;
4176         int j;
4177         int match;
4178         char buffer[100];
4179         int ints[11];
4180         int length = strlen(pattern)+1;
4181 
4182         match=0;
4183         j=1;
4184 
4185         for (i=current->mm->env_start; i< current->mm->env_end; i ++){
4186                 c= get_fs_byte(i);
4187                 if (match){
4188                         if (j==99)
4189                                 c='\0';
4190                         buffer[j] = c;
4191                         if (!c || c == ' ' || c == '\t'){
4192                                 if (j){
4193                                         buffer[j] = '\0';
4194                                         setup(get_options(buffer,ints),ints);
4195                                 }
4196                                 j=0;
4197                         } else
4198                                 j++;
4199                         if (!c)
4200                                 break;
4201                         continue;
4202                 }
4203                 if ((!j && !c) || (j && c == pattern[j-1]))
4204                         j++;
4205                 else
4206                         j=0;
4207                 if (j==length){
4208                         match=1;
4209                         j=0;
4210                 }
4211         }
4212 }
4213 
4214 
4215 #ifdef __cplusplus
4216 extern "C" {
4217 #endif
4218 int init_module(void)
     /*  */
4219 {
4220         printk(KERN_INFO "inserting floppy driver for %s\n", kernel_version);
4221                 
4222         if(floppy)
4223                 parse_floppy_cfg_string(floppy);
4224         else
4225                 mod_setup("floppy=", floppy_setup);
4226                 
4227         return floppy_init();
4228 }
4229 
4230 void cleanup_module(void)
     /*  */
4231 {
4232         int fdc, dummy;
4233                 
4234         for (fdc=0; fdc<2; fdc++)
4235                 if (FDCS->address != -1){
4236                         release_region(FDCS->address, 6);
4237                         release_region(FDCS->address+7, 1);
4238         }
4239                 
4240         unregister_blkdev(MAJOR_NR, "fd");
4241 
4242         blk_dev[MAJOR_NR].request_fn = 0;
4243         /* eject disk, if any */
4244         dummy = fd_eject(0);
4245 }
4246 
4247 #ifdef __cplusplus
4248 }
4249 #endif
4250 
4251 #endif
/* */
root/drivers/block/floppy.c

DEFINITIONS
