root/drivers/block/floppy.c

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DEFINITIONS

This source file includes following definitions.
  1. __get_order
  2. dma_mem_alloc
  3. ITYPE
  4. XTYPE
  5. TYPE
  6. DRIVE
  7. set_debugt
  8. debugt
  9. is_alive
  10. reschedule_timeout
  11. disk_change
  12. is_selected
  13. set_dor
  14. twaddle
  15. reset_fdc_info
  16. set_fdc
  17. lock_fdc
  18. unlock_fdc
  19. motor_off_callback
  20. floppy_off
  21. scandrives
  22. fd_watchdog
  23. main_command_interrupt
  24. wait_for_completion
  25. floppy_disable_hlt
  26. floppy_enable_hlt
  27. setup_DMA
  28. output_byte
  29. result
  30. perpendicular_mode
  31. fdc_specify
  32. fdc_dtr
  33. tell_sector
  34. interpret_errors
  35. setup_rw_floppy
  36. seek_interrupt
  37. check_wp
  38. seek_floppy
  39. recal_interrupt
  40. unexpected_floppy_interrupt
  41. floppy_interrupt
  42. recalibrate_floppy
  43. reset_interrupt
  44. reset_fdc
  45. empty
  46. show_floppy
  47. floppy_shutdown
  48. start_motor
  49. floppy_ready
  50. floppy_start
  51. do_wakeup
  52. wait_til_done
  53. generic_done
  54. generic_success
  55. generic_failure
  56. success_and_wakeup
  57. failure_and_wakeup
  58. next_valid_format
  59. bad_flp_intr
  60. set_floppy
  61. format_interrupt
  62. setup_format_params
  63. redo_format
  64. do_format
  65. request_done
  66. rw_interrupt
  67. buffer_chain_size
  68. transfer_size
  69. copy_buffer
  70. make_raw_rw_request
  71. redo_fd_request
  72. process_fd_request
  73. do_fd_request
  74. poll_drive
  75. reset_intr
  76. user_reset_fdc
  77. fd_copyout
  78. drive_name
  79. raw_cmd_ioctl
  80. invalidate_drive
  81. fd_ioctl
  82. config_types
  83. floppy_read
  84. floppy_write
  85. floppy_release
  86. floppy_open
  87. check_floppy_change
  88. floppy_revalidate
  89. get_fdc_version
  90. floppy_invert_dcl
  91. daring
  92. allow_drives
  93. fdc2_adr
  94. unex
  95. set_cmos
  96. floppy_setup
  97. floppy_init
  98. floppy_grab_irq_and_dma
  99. floppy_release_irq_and_dma
  100. mod_setup
  101. init_module
  102. 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 #define CONFIG_FLOPPY_SANITY
  91 #undef  CONFIG_FLOPPY_SILENT_DCL_CLEAR
  92 
  93 #define REALLY_SLOW_IO
  94 
  95 #define DEBUGT 2
  96 #define DCL_DEBUG /* debug disk change line */
  97 
  98 #include <linux/config.h>
  99 
 100 /* do print messages for unexpected interrupts */
 101 static int print_unex=1;
 102 
 103 #ifdef MODULE
 104 #define FD_MODULE
 105 
 106 #include <linux/module.h>
 107 /*
 108  * NB. we must include the kernel identification string to install the module.
 109  */
 110 #include <linux/version.h>
 111 char kernel_version[] = UTS_RELEASE;
 112 
 113 int FLOPPY_IRQ=6;
 114 int FLOPPY_DMA=2;
 115 int ALLOWED_DRIVE_MASK = 0x33;
 116 int FDC1 = 0x3f0;
 117 int FDC2 = -1;
 118 
 119 #endif
 120 
 121 #ifndef FD_MODULE
 122 /* the following is the mask of allowed drives. By default units 2 and
 123  * 3 of both floppy controllers are disabled, because switching on the
 124  * motor of these drives causes system hangs on some PCI computers. drive
 125  * 0 is the low bit (0x1), and drive 7 is the high bit (0x80). Bits are on if
 126  * a drive is allowed. */
 127 static int ALLOWED_DRIVE_MASK=0x33;
 128 
 129 #define FLOPPY_IRQ 6
 130 #define FLOPPY_DMA 2
 131 #define FDC1 0x3f0
 132 static int FDC2=-1;
 133 #endif
 134 
 135 #define MODULE_AWARE_DRIVER
 136 
 137 #include <linux/sched.h>
 138 #include <linux/fs.h>
 139 #include <linux/kernel.h>
 140 #include <linux/timer.h>
 141 #include <linux/tqueue.h>
 142 #define FDPATCHES
 143 #include <linux/fdreg.h>
 144 #include <linux/fd.h>
 145 #include <linux/errno.h>
 146 #include <linux/malloc.h>
 147 #include <linux/mm.h>
 148 #include <linux/string.h>
 149 #include <linux/fcntl.h>
 150 #include <linux/delay.h>
 151 #include <linux/mc146818rtc.h> /* CMOS defines */
 152 #include <linux/ioport.h>
 153 
 154 #include <asm/dma.h>
 155 #include <asm/irq.h>
 156 #include <asm/system.h>
 157 #include <asm/io.h>
 158 #include <asm/segment.h>
 159 
 160 #define MAJOR_NR FLOPPY_MAJOR
 161 #include "blk.h"
 162 
 163 
 164 /* Dma Memory related stuff */
 165 
 166 /* Pure 2^n version of get_order */
 167 static inline int __get_order (int size)
     /* [previous][next][first][last][top][bottom][index][help] */
 168 {
 169         int order;
 170 
 171 #ifdef  _ASM_IO_H2
 172         __asm__ __volatile__("bsr %1,%0"
 173                              : "=r" (order)
 174                              : "r" (size / PAGE_SIZE) );        
 175 #else
 176         for (order = 0; order < NR_MEM_LISTS; ++order)
 177                 if (size <= (PAGE_SIZE << order))
 178                         return order; 
 179 #endif
 180         return NR_MEM_LISTS;
 181 }
 182 
 183 static unsigned long dma_mem_alloc(int size)
     /* [previous][next][first][last][top][bottom][index][help] */
 184 {
 185         int order = __get_order(size);
 186         
 187         if (order >= NR_MEM_LISTS)
 188                 return(0);
 189         return __get_dma_pages(GFP_KERNEL,order);
 190 }
 191 
 192 /* End dma memory related stuff */
 193 
 194 static unsigned int fake_change = 0;
 195 static int initialising=1;
 196 
 197 /*
 198  * Again, the CMOS information doesn't work on the alpha..
 199  */
 200 #ifdef __alpha__
 201 #define FLOPPY0_TYPE 6
 202 #define FLOPPY1_TYPE 0
 203 #else
 204 #define FLOPPY0_TYPE    ((CMOS_READ(0x10) >> 4) & 15)
 205 #define FLOPPY1_TYPE    (CMOS_READ(0x10) & 15)
 206 #endif
 207 
 208 #define N_FDC 2
 209 #define N_DRIVE 8
 210 
 211 static inline int ITYPE(int x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 212         return  (x>>2) & 0x1f;
 213 }
 214 static inline int XTYPE(int x) { /* called with a fd_device field as arg */
     /* [previous][next][first][last][top][bottom][index][help] */
 215         return  ITYPE(x);
 216 }
 217 static inline int TYPE(kdev_t x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 218         return  (MINOR(x)>>2) & 0x1f;
 219 }
 220 static inline int DRIVE(kdev_t x) {
     /* [previous][next][first][last][top][bottom][index][help] */
 221         return (MINOR(x)&0x03) | ((MINOR(x)&0x80 ) >> 5);
 222 }
 223 #define TOMINOR(x) ((x & 3) | ((x & 4) << 5))
 224 #define UNIT(x) ( (x) & 0x03 )          /* drive on fdc */
 225 #define FDC(x) ( ((x) & 0x04) >> 2 )  /* fdc of drive */
 226 #define REVDRIVE(fdc, unit) ( (unit) + ((fdc) << 2 ))
 227                                 /* reverse mapping from unit and fdc to drive */
 228 #define DP (&drive_params[current_drive])
 229 #define DRS (&drive_state[current_drive])
 230 #define DRWE (&write_errors[current_drive])
 231 #define FDCS (&fdc_state[fdc])
 232 #define CLEARF(x) (clear_bit(x##_BIT, &DRS->flags))
 233 #define SETF(x) (set_bit(x##_BIT, &DRS->flags))
 234 #define TESTF(x) (test_bit(x##_BIT, &DRS->flags))
 235 
 236 #define UDP (&drive_params[drive])
 237 #define UDRS (&drive_state[drive])
 238 #define UDRWE (&write_errors[drive])
 239 #define UFDCS (&fdc_state[FDC(drive)])
 240 #define UCLEARF(x) (clear_bit(x##_BIT, &UDRS->flags))
 241 #define USETF(x) (set_bit(x##_BIT, &UDRS->flags))
 242 #define UTESTF(x) (test_bit(x##_BIT, &UDRS->flags))
 243 
 244 #define DPRINT(x) printk(DEVICE_NAME "%d: " x,current_drive)
 245 
 246 #define DPRINT1(x,x1) \
 247 printk(DEVICE_NAME "%d: " x,current_drive,(x1))
 248 
 249 #define DPRINT2(x,x1,x2) \
 250 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2))
 251 
 252 #define DPRINT3(x,x1,x2,x3) \
 253 printk(DEVICE_NAME "%d: " x,current_drive,(x1),(x2),(x3))
 254 
 255 #define PH_HEAD(floppy,head) (((((floppy)->stretch & 2) >>1) ^ head) << 2)
 256 #define STRETCH(floppy) ((floppy)->stretch & FD_STRETCH)
 257 
 258 /* read/write */
 259 #define COMMAND raw_cmd.cmd[0]
 260 #define DR_SELECT raw_cmd.cmd[1]
 261 #define TRACK raw_cmd.cmd[2]
 262 #define HEAD raw_cmd.cmd[3]
 263 #define SECTOR raw_cmd.cmd[4]
 264 #define SIZECODE raw_cmd.cmd[5]
 265 #define SECT_PER_TRACK raw_cmd.cmd[6]
 266 #define GAP raw_cmd.cmd[7]
 267 #define SIZECODE2 raw_cmd.cmd[8]
 268 #define NR_RW 9
 269 
 270 /* format */
 271 #define F_SIZECODE raw_cmd.cmd[2]
 272 #define F_SECT_PER_TRACK raw_cmd.cmd[3]
 273 #define F_GAP raw_cmd.cmd[4]
 274 #define F_FILL raw_cmd.cmd[5]
 275 #define NR_F 6
 276 
 277 /*
 278  * Maximum disk size (in kilobytes). This default is used whenever the
 279  * current disk size is unknown.
 280  * [Now it is rather a minimum]
 281  */
 282 #define MAX_DISK_SIZE 2 /* 3984*/
 283 
 284 
 285 #define K_64    0x10000         /* 64KB */
 286 
 287 /*
 288  * The DMA channel used by the floppy controller cannot access data at
 289  * addresses >= 16MB
 290  *
 291  * Went back to the 1MB limit, as some people had problems with the floppy
 292  * driver otherwise. It doesn't matter much for performance anyway, as most
 293  * floppy accesses go through the track buffer.
 294  */
 295 #ifdef __alpha__
 296 # define CROSS_64KB(a,s)        (0)
 297 #else
 298 # define CROSS_64KB(a,s) \
 299         ((unsigned long)(a)/K_64 != ((unsigned long)(a) + (s) - 1) / K_64)
 300 #endif
 301 
 302 /*
 303  * globals used by 'result()'
 304  */
 305 #define MAX_REPLIES 10
 306 static unsigned char reply_buffer[MAX_REPLIES];
 307 static int inr; /* size of reply buffer, when called from interrupt */
 308 #define ST0 (reply_buffer[0])
 309 #define ST1 (reply_buffer[1])
 310 #define ST2 (reply_buffer[2])
 311 #define ST3 (reply_buffer[0]) /* result of GETSTATUS */
 312 #define R_TRACK (reply_buffer[3])
 313 #define R_HEAD (reply_buffer[4])
 314 #define R_SECTOR (reply_buffer[5])
 315 #define R_SIZECODE (reply_buffer[6])
 316 
 317 #define SEL_DLY (2*HZ/100)
 318 
 319 #define ARRAY_SIZE(x) (sizeof(x) / sizeof( (x)[0] ))
 320 /*
 321  * this struct defines the different floppy drive types.
 322  */
 323 static struct {
 324         struct floppy_drive_params params;
 325         const char *name; /* name printed while booting */
 326 } default_drive_params[]= {
 327 /* NOTE: the time values in jiffies should be in msec!
 328  CMOS drive type
 329   |     Maximum data rate supported by drive type
 330   |     |   Head load time, msec
 331   |     |   |   Head unload time, msec (not used)
 332   |     |   |   |     Step rate interval, usec
 333   |     |   |   |     |       Time needed for spinup time (jiffies)
 334   |     |   |   |     |       |      Timeout for spinning down (jiffies)
 335   |     |   |   |     |       |      |   Spindown offset (where disk stops)
 336   |     |   |   |     |       |      |   |     Select delay
 337   |     |   |   |     |       |      |   |     |     RPS
 338   |     |   |   |     |       |      |   |     |     |    Max number of tracks
 339   |     |   |   |     |       |      |   |     |     |    |     Interrupt timeout
 340   |     |   |   |     |       |      |   |     |     |    |     |   Max nonintlv. sectors
 341   |     |   |   |     |       |      |   |     |     |    |     |   | -Max Errors- flags */
 342 {{0,  500, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  80, 3*HZ, 20, {3,1,2,0,2}, 0,
 343       0, { 7, 4, 8, 2, 1, 5, 3,10}, 3*HZ/2, 0 }, "unknown" },
 344 
 345 {{1,  300, 16, 16, 8000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  40, 3*HZ, 17, {3,1,2,0,2}, 0,
 346       0, { 1, 0, 0, 0, 0, 0, 0, 0}, 3*HZ/2, 1 }, "360K PC" }, /*5 1/4 360 KB PC*/
 347 
 348 {{2,  500, 16, 16, 6000, 4*HZ/10, 3*HZ, 14, SEL_DLY, 6,  83, 3*HZ, 17, {3,1,2,0,2}, 0,
 349       0, { 2, 5, 6,23,10,20,11, 0}, 3*HZ/2, 2 }, "1.2M" }, /*5 1/4 HD AT*/
 350 
 351 {{3,  250, 16, 16, 3000,    1*HZ, 3*HZ,  0, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 352       0, { 4,22,21,30, 3, 0, 0, 0}, 3*HZ/2, 4 }, "720k" }, /*3 1/2 DD*/
 353 
 354 {{4,  500, 16, 16, 4000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 20, {3,1,2,0,2}, 0,
 355       0, { 7, 4,25,22,31,21,29,11}, 3*HZ/2, 7 }, "1.44M" }, /*3 1/2 HD*/
 356 
 357 {{5, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 358       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M AMI BIOS" }, /*3 1/2 ED*/
 359 
 360 {{6, 1000, 15,  8, 3000, 4*HZ/10, 3*HZ, 10, SEL_DLY, 5,  83, 3*HZ, 40, {3,1,2,0,2}, 0,
 361       0, { 7, 8, 4,25,28,22,31,21}, 3*HZ/2, 8 }, "2.88M" } /*3 1/2 ED*/
 362 /*    |  ---autodetected formats--   |      |      |
 363       read_track                     |      |    Name printed when booting
 364                                      |     Native format
 365                                    Frequency of disk change checks */
 366 };
 367 
 368 static struct floppy_drive_params drive_params[N_DRIVE];
 369 static struct floppy_drive_struct drive_state[N_DRIVE];
 370 static struct floppy_write_errors write_errors[N_DRIVE];
 371 static struct floppy_raw_cmd raw_cmd;
 372 
 373 /*
 374  * This struct defines the different floppy types.
 375  *
 376  * Bit 0 of 'stretch' tells if the tracks need to be doubled for some
 377  * types (e.g. 360kB diskette in 1.2MB drive, etc.).  Bit 1 of 'stretch'
 378  * tells if the disk is in Commodore 1581 format, which means side 0 sectors
 379  * are located on side 1 of the disk but with a side 0 ID, and vice-versa.
 380  * This is the same as the Sharp MZ-80 5.25" CP/M disk format, except that the
 381  * 1581's logical side 0 is on physical side 1, whereas the Sharp's logical
 382  * side 0 is on physical side 0 (but with the misnamed sector IDs).
 383  * 'stretch' should probably be renamed to something more general, like
 384  * 'options'.  Other parameters should be self-explanatory (see also
 385  * setfdprm(8)).
 386  */
 387 static struct floppy_struct floppy_type[32] = {
 388         {    0, 0,0, 0,0,0x00,0x00,0x00,0x00,NULL    }, /*  0 no testing    */
 389         {  720, 9,2,40,0,0x2A,0x02,0xDF,0x50,"d360"  }, /*  1 360KB PC      */
 390         { 2400,15,2,80,0,0x1B,0x00,0xDF,0x54,"h1200" }, /*  2 1.2MB AT      */
 391         {  720, 9,1,80,0,0x2A,0x02,0xDF,0x50,"D360"  }, /*  3 360KB SS 3.5" */
 392         { 1440, 9,2,80,0,0x2A,0x02,0xDF,0x50,"D720"  }, /*  4 720KB 3.5"    */
 393         {  720, 9,2,40,1,0x23,0x01,0xDF,0x50,"h360"  }, /*  5 360KB AT      */
 394         { 1440, 9,2,80,0,0x23,0x01,0xDF,0x50,"h720"  }, /*  6 720KB AT      */
 395         { 2880,18,2,80,0,0x1B,0x00,0xCF,0x6C,"H1440" }, /*  7 1.44MB 3.5"   */
 396         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"E2880" }, /*  8 2.88MB 3.5"   */
 397         { 5760,36,2,80,0,0x1B,0x43,0xAF,0x54,"CompaQ"}, /*  9 2.88MB 3.5"   */
 398 
 399         { 2880,18,2,80,0,0x25,0x00,0xDF,0x02,"h1440" }, /* 10 1.44MB 5.25"  */
 400         { 3360,21,2,80,0,0x1C,0x00,0xCF,0x0C,"H1680" }, /* 11 1.68MB 3.5"   */
 401         {  820,10,2,41,1,0x25,0x01,0xDF,0x2E,"h410"  }, /* 12 410KB 5.25"   */
 402         { 1640,10,2,82,0,0x25,0x02,0xDF,0x2E,"H820"  }, /* 13 820KB 3.5"    */
 403         { 2952,18,2,82,0,0x25,0x00,0xDF,0x02,"h1476" }, /* 14 1.48MB 5.25"  */
 404         { 3444,21,2,82,0,0x25,0x00,0xDF,0x0C,"H1722" }, /* 15 1.72MB 3.5"   */
 405         {  840,10,2,42,1,0x25,0x01,0xDF,0x2E,"h420"  }, /* 16 420KB 5.25"   */
 406         { 1660,10,2,83,0,0x25,0x02,0xDF,0x2E,"H830"  }, /* 17 830KB 3.5"    */
 407         { 2988,18,2,83,0,0x25,0x00,0xDF,0x02,"h1494" }, /* 18 1.49MB 5.25"  */
 408         { 3486,21,2,83,0,0x25,0x00,0xDF,0x0C,"H1743" }, /* 19 1.74 MB 3.5"  */
 409 
 410         { 1760,11,2,80,0,0x1C,0x09,0xCF,0x00,"h880"  }, /* 20 880KB 5.25"   */
 411         { 2080,13,2,80,0,0x1C,0x01,0xCF,0x00,"D1040" }, /* 21 1.04MB 3.5"   */
 412         { 2240,14,2,80,0,0x1C,0x19,0xCF,0x00,"D1120" }, /* 22 1.12MB 3.5"   */
 413         { 3200,20,2,80,0,0x1C,0x20,0xCF,0x2C,"h1600" }, /* 23 1.6MB 5.25"   */
 414         { 3520,22,2,80,0,0x1C,0x08,0xCF,0x2e,"H1760" }, /* 24 1.76MB 3.5"   */
 415         { 3840,24,2,80,0,0x1C,0x20,0xCF,0x00,"H1920" }, /* 25 1.92MB 3.5"   */
 416         { 6400,40,2,80,0,0x25,0x5B,0xCF,0x00,"E3200" }, /* 26 3.20MB 3.5"   */
 417         { 7040,44,2,80,0,0x25,0x5B,0xCF,0x00,"E3520" }, /* 27 3.52MB 3.5"   */
 418         { 7680,48,2,80,0,0x25,0x63,0xCF,0x00,"E3840" }, /* 28 3.84MB 3.5"   */
 419 
 420         { 3680,23,2,80,0,0x1C,0x10,0xCF,0x00,"H1840" }, /* 29 1.84MB 3.5"   */
 421         { 1600,10,2,80,0,0x25,0x02,0xDF,0x2E,"D800"  }, /* 30 800KB 3.5"    */
 422         { 3200,20,2,80,0,0x1C,0x00,0xCF,0x2C,"H1600" }, /* 31 1.6MB 3.5"    */
 423 };
 424 
 425 #define NUMBER(x)       (sizeof(x) / sizeof(*(x)))
 426 #define SECTSIZE ( _FD_SECTSIZE(*floppy))
 427 
 428 /* Auto-detection: Disk type used until the next media change occurs. */
 429 struct floppy_struct *current_type[N_DRIVE] = {
 430         NULL, NULL, NULL, NULL,
 431         NULL, NULL, NULL, NULL
 432 };
 433 
 434 /*
 435  * User-provided type information. current_type points to
 436  * the respective entry of this array.
 437  */
 438 struct floppy_struct user_params[N_DRIVE];
 439 
 440 static int floppy_sizes[256];
 441 static int floppy_blocksizes[256] = { 0, };
 442 
 443 /*
 444  * The driver is trying to determine the correct media format
 445  * while probing is set. rw_interrupt() clears it after a
 446  * successful access.
 447  */
 448 static int probing = 0;
 449 
 450 /* Synchronization of FDC access. */
 451 #define FD_COMMAND_DETECT -2
 452 #define FD_COMMAND_NONE -1
 453 #define FD_COMMAND_ERROR 2
 454 #define FD_COMMAND_OKAY 3
 455 
 456 static volatile int command_status = FD_COMMAND_NONE, fdc_busy = 0;
 457 static struct wait_queue *fdc_wait = NULL, *command_done = NULL;
 458 #define NO_SIGNAL (!(current->signal & ~current->blocked) || !interruptible)
 459 #define CALL(x) if( (x) == -EINTR) return -EINTR;
 460 #define _WAIT(x,i) CALL(ret=wait_til_done((x),i))
 461 #define WAIT(x) _WAIT((x),interruptible)
 462 #define IWAIT(x) _WAIT((x),1)
 463 
 464 /* Errors during formatting are counted here. */
 465 static int format_errors;
 466 
 467 /* Format request descriptor. */
 468 static struct format_descr format_req;
 469 
 470 /*
 471  * Rate is 0 for 500kb/s, 1 for 300kbps, 2 for 250kbps
 472  * Spec1 is 0xSH, where S is stepping rate (F=1ms, E=2ms, D=3ms etc),
 473  * H is head unload time (1=16ms, 2=32ms, etc)
 474  */
 475 
 476 /*
 477  * Track buffer
 478  * Because these are written to by the DMA controller, they must
 479  * not contain a 64k byte boundary crossing, or data will be
 480  * corrupted/lost. Alignment of these is enforced in boot/head.S.
 481  * Note that you must not change the sizes below without updating head.S.
 482  */
 483 char *floppy_track_buffer=0;
 484 int max_buffer_sectors=0;
 485 
 486 int *errors;
 487 typedef void (*done_f)(int);
 488 struct cont_t {
 489 void (*interrupt)(void); /* this is called after the interrupt of the
 490                           * main command */
 491 void (*redo)(void); /* this is called to retry the operation */
 492 void (*error)(void); /* this is called to tally an error */
 493 done_f done; /* this is called to say if the operation has succeeded/failed */
 494 } *cont=NULL;
 495 
 496 static void floppy_ready(void);
 497 static void floppy_start(void);
 498 static void process_fd_request(void);
 499 static void recalibrate_floppy(void);
 500 static void floppy_shutdown(void);
 501 
 502 static int floppy_grab_irq_and_dma(void);
 503 static void floppy_release_irq_and_dma(void);
 504 
 505 /*
 506  * The "reset" variable should be tested whenever an interrupt is scheduled,
 507  * after the commands have been sent. This is to ensure that the driver doesn't
 508  * get wedged when the interrupt doesn't come because of a failed command.
 509  * reset doesn't need to be tested before sending commands, because
 510  * output_byte is automatically disabled when reset is set.
 511  */
 512 #define CHECK_RESET { if ( FDCS->reset ){ reset_fdc(); return ; } }
 513 static void reset_fdc(void);
 514 
 515 /*
 516  * These are global variables, as that's the easiest way to give
 517  * information to interrupts. They are the data used for the current
 518  * request.
 519  */
 520 #define NO_TRACK -1
 521 #define NEED_1_RECAL -2
 522 #define NEED_2_RECAL -3
 523 
 524 /* */
 525 static int usage_count = 0;
 526 
 527 
 528 /* buffer related variables */
 529 static int buffer_track = -1;
 530 static int buffer_drive = -1;
 531 static int buffer_min = -1;
 532 static int buffer_max = -1;
 533 
 534 /* fdc related variables, should end up in a struct */
 535 static struct floppy_fdc_state fdc_state[N_FDC];
 536 static int fdc; /* current fdc */
 537 
 538 static struct floppy_struct * floppy = floppy_type;
 539 static unsigned char current_drive = 0;
 540 static long current_count_sectors = 0;
 541 static char *current_addr = 0;
 542 static unsigned char sector_t; /* sector in track */
 543 
 544 #ifdef DEBUGT
 545 long unsigned debugtimer;
 546 #endif
 547 
 548 /*
 549  * Debugging
 550  * =========
 551  */
 552 static inline void set_debugt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 553 {
 554 #ifdef DEBUGT
 555         debugtimer = jiffies;
 556 #endif
 557 }
 558 
 559 static inline void debugt(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 560 {
 561 #ifdef DEBUGT
 562   if ( DP->flags & DEBUGT )
 563         printk("%s dtime=%lu\n", message, jiffies-debugtimer );
 564 #endif
 565 }
 566 
 567 typedef void (*timeout_fn)(unsigned long);
 568 static struct timer_list fd_timeout ={ NULL, NULL, 0, 0, 
 569                                                (timeout_fn) floppy_shutdown };
 570 
 571 static const char *timeout_message;
 572 
 573 #ifdef CONFIG_FLOPPY_SANITY
 574 static void is_alive(const char *message)
     /* [previous][next][first][last][top][bottom][index][help] */
 575 {
 576         /* this routine checks whether the floppy driver is "alive" */
 577         if (fdc_busy && command_status < 2 && !fd_timeout.prev){
 578                 DPRINT1("timeout handler died: %s\n",message);
 579         }
 580 }
 581 #endif
 582 
 583 #ifdef CONFIG_FLOPPY_SANITY
 584 
 585 #define OLOGSIZE 20
 586 
 587 void (*lasthandler)(void) = NULL;
 588 int interruptjiffies=0;
 589 int resultjiffies=0;
 590 int resultsize=0;
 591 int lastredo=0;
 592 
 593 static struct output_log {
 594         unsigned char data;
 595         unsigned char status;
 596         unsigned long jiffies;
 597 } output_log[OLOGSIZE];
 598 
 599 static int output_log_pos=0;
 600 #endif
 601 
 602 #define CURRENTD -1
 603 #define MAXTIMEOUT -2
 604 
 605 
 606 
 607 static void reschedule_timeout(int drive, const char *message, int marg)
     /* [previous][next][first][last][top][bottom][index][help] */
 608 {
 609         if (drive == CURRENTD )
 610                 drive = current_drive;
 611         del_timer(&fd_timeout);
 612         if (drive < 0 || drive > N_DRIVE) {
 613                 fd_timeout.expires = jiffies + 20*HZ;
 614                 drive=0;
 615         } else
 616                 fd_timeout.expires = jiffies + UDP->timeout;
 617         add_timer(&fd_timeout);
 618         if (UDP->flags & FD_DEBUG){
 619                 DPRINT("reschedule timeout ");
 620                 printk(message, marg);
 621                 printk("\n");
 622         }
 623         timeout_message = message;
 624 }
 625 
 626 /*
 627  * Bottom half floppy driver.
 628  * ==========================
 629  *
 630  * This part of the file contains the code talking directly to the hardware,
 631  * and also the main service loop (seek-configure-spinup-command)
 632  */
 633 
 634 /*
 635  * disk change.
 636  * This routine is responsible for maintaining the FD_DISK_CHANGE flag,
 637  * and the last_checked date.
 638  *
 639  * last_checked is the date of the last check which showed 'no disk change'
 640  * FD_DISK_CHANGE is set under two conditions:
 641  * 1. The floppy has been changed after some i/o to that floppy already
 642  *    took place.
 643  * 2. No floppy disk is in the drive. This is done in order to ensure that
 644  *    requests are quickly flushed in case there is no disk in the drive. It
 645  *    follows that FD_DISK_CHANGE can only be cleared if there is a disk in
 646  *    the drive.
 647  *
 648  * For 1., maxblock is observed. Maxblock is 0 if no i/o has taken place yet.
 649  * For 2., FD_DISK_NEWCHANGE is watched. FD_DISK_NEWCHANGE is cleared on
 650  *  each seek. If a disk is present, the disk change line should also be
 651  *  cleared on each seek. Thus, if FD_DISK_NEWCHANGE is clear, but the disk
 652  *  change line is set, this means either that no disk is in the drive, or
 653  *  that it has been removed since the last seek.
 654  *
 655  * This means that we really have a third possibility too:
 656  *  The floppy has been changed after the last seek.
 657  */
 658 
 659 static int disk_change(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 660 {
 661         int fdc=FDC(drive);
 662 #ifdef CONFIG_FLOPPY_SANITY
 663         if(jiffies < UDP->select_delay + UDRS->select_date)
 664                 DPRINT("WARNING disk change called early\n");
 665         if(! (FDCS->dor & (0x10 << UNIT(drive))) ||
 666            (FDCS->dor & 3) != UNIT(drive) ||
 667            fdc != FDC(drive)){
 668                 DPRINT("probing disk change on unselected drive\n");
 669                 DPRINT3("drive=%d fdc=%d dor=%x\n",drive, FDC(drive),
 670                         FDCS->dor);
 671         }
 672 #endif
 673 
 674 #ifdef DCL_DEBUG
 675         if (UDP->flags & FD_DEBUG){
 676                 DPRINT1("checking disk change line for drive %d\n",drive);
 677                 DPRINT1("jiffies=%ld\n", jiffies);
 678                 DPRINT1("disk change line=%x\n",inb_p(FD_DIR)&0x80);
 679                 DPRINT1("flags=%x\n",UDRS->flags);
 680         }
 681 #endif
 682         if (UDP->flags & FD_BROKEN_DCL)
 683                 return UTESTF(FD_DISK_CHANGED);
 684         if( (inb_p(FD_DIR) ^ UDP->flags) & 0x80){
 685                 USETF(FD_VERIFY); /* verify write protection */
 686                 if(UDRS->maxblock){
 687                         /* mark it changed */
 688                         USETF(FD_DISK_CHANGED);
 689 
 690                         /* invalidate its geometry */
 691                         if (UDRS->keep_data >= 0) {
 692                                 if ((UDP->flags & FTD_MSG) &&
 693                                     current_type[drive] != NULL)
 694                                         DPRINT("Disk type is undefined after "
 695                                                "disk change\n");
 696                                 current_type[drive] = NULL;
 697                                 floppy_sizes[TOMINOR(current_drive)] = MAX_DISK_SIZE;
 698                         }
 699                 }
 700                 /*USETF(FD_DISK_NEWCHANGE);*/
 701                 return 1;
 702         } else {
 703                 UDRS->last_checked=jiffies;
 704                 UCLEARF(FD_DISK_NEWCHANGE);
 705         }
 706         return 0;
 707 }
 708 
 709 static inline int is_selected(int dor, int unit)
     /* [previous][next][first][last][top][bottom][index][help] */
 710 {
 711         return ( (dor  & (0x10 << unit)) && (dor &3) == unit);
 712 }
 713 
 714 static int set_dor(int fdc, char mask, char data)
     /* [previous][next][first][last][top][bottom][index][help] */
 715 {
 716         register unsigned char drive, unit, newdor,olddor;
 717 
 718         if(FDCS->address == -1)
 719                 return -1;
 720 
 721         olddor = FDCS->dor;
 722         newdor =  (olddor & mask) | data;
 723         if ( newdor != olddor ){
 724                 unit = olddor & 0x3;
 725                 if(is_selected(olddor, unit) && !is_selected(newdor,unit)){
 726                         drive = REVDRIVE(fdc,unit);
 727 #ifdef DCL_DEBUG
 728                         if (UDP->flags & FD_DEBUG){
 729                                 DPRINT("calling disk change from set_dor\n");
 730                         }
 731 #endif
 732                         disk_change(drive);
 733                 }
 734                 FDCS->dor = newdor;
 735                 outb_p(newdor, FD_DOR);
 736 
 737                 unit = newdor & 0x3;
 738                 if(!is_selected(olddor, unit) && is_selected(newdor,unit)){
 739                         drive = REVDRIVE(fdc,unit);
 740                         UDRS->select_date = jiffies;
 741                 }
 742         }
 743         if ( newdor & 0xf0 )
 744                 floppy_grab_irq_and_dma();
 745         if( olddor & 0xf0 )
 746                 floppy_release_irq_and_dma();
 747         return olddor;
 748 }
 749 
 750 static void twaddle(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 751 {
 752         if (DP->select_delay)
 753                 return;
 754         outb_p(FDCS->dor & ~(0x10<<UNIT(current_drive)),FD_DOR);
 755         outb_p(FDCS->dor, FD_DOR);
 756         DRS->select_date = jiffies;
 757 }
 758 
 759 /* reset all driver information about the current fdc. This is needed after
 760  * a reset, and after a raw command. */
 761 static void reset_fdc_info(int mode)
     /* [previous][next][first][last][top][bottom][index][help] */
 762 {
 763         int drive;
 764 
 765         FDCS->spec1 = FDCS->spec2 = -1;
 766         FDCS->need_configure = 1;
 767         FDCS->perp_mode = 1;
 768         FDCS->rawcmd = 0;
 769         for ( drive = 0; drive < N_DRIVE; drive++)
 770                 if (FDC(drive) == fdc &&
 771                     ( mode || UDRS->track != NEED_1_RECAL))
 772                         UDRS->track = NEED_2_RECAL;
 773 }
 774 
 775 /* selects the fdc and drive, and enables the fdc's input/dma. */
 776 static void set_fdc(int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 777 {
 778         if (drive >= 0 && drive < N_DRIVE){
 779                 fdc = FDC(drive);
 780                 current_drive = drive;
 781         }
 782         set_dor(fdc,~0,8);
 783         set_dor(1-fdc, ~8, 0);
 784         if ( FDCS->rawcmd == 2 )
 785                 reset_fdc_info(1);
 786         if( inb_p(FD_STATUS) != STATUS_READY )
 787                 FDCS->reset = 1;
 788 }
 789 
 790 /* locks the driver */
 791 static int lock_fdc(int drive, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
 792 {
 793         if(!usage_count){
 794                 printk("trying to lock fdc while usage count=0\n");
 795                 return -1;
 796         }
 797         floppy_grab_irq_and_dma();
 798         if (!current->pid)
 799                 run_task_queue(&tq_timer);
 800         cli();
 801         while (fdc_busy && NO_SIGNAL)
 802                 interruptible_sleep_on(&fdc_wait);
 803         if(fdc_busy){
 804                 sti();
 805                 return -EINTR;
 806         }
 807         fdc_busy = 1;
 808         sti();
 809         command_status = FD_COMMAND_NONE;
 810         set_fdc(drive);
 811         reschedule_timeout(drive, "lock fdc", 0);
 812         return 0;
 813 }
 814 
 815 #define LOCK_FDC(drive,interruptible) \
 816 if(lock_fdc(drive,interruptible)) return -EINTR;
 817 
 818 
 819 /* unlocks the driver */
 820 static inline void unlock_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 821 {
 822         if (!fdc_busy)
 823                 DPRINT("FDC access conflict!\n");
 824 
 825         if ( DEVICE_INTR )
 826                 DPRINT1("device interrupt still active at FDC release: %p!\n",
 827                         DEVICE_INTR);
 828         command_status = FD_COMMAND_NONE;
 829         del_timer(&fd_timeout);
 830         cont = NULL;
 831         fdc_busy = 0;
 832         floppy_release_irq_and_dma();
 833         wake_up(&fdc_wait);
 834 }
 835 
 836 /* switches the motor off after a given timeout */
 837 static void motor_off_callback(unsigned long nr)
     /* [previous][next][first][last][top][bottom][index][help] */
 838 {
 839         unsigned char mask = ~(0x10 << UNIT(nr));
 840 
 841         set_dor( FDC(nr), mask, 0 );
 842 }
 843 
 844 static struct timer_list motor_off_timer[N_DRIVE] = {
 845         { NULL, NULL, 0, 0, motor_off_callback },
 846         { NULL, NULL, 0, 1, motor_off_callback },
 847         { NULL, NULL, 0, 2, motor_off_callback },
 848         { NULL, NULL, 0, 3, motor_off_callback },
 849         { NULL, NULL, 0, 4, motor_off_callback },
 850         { NULL, NULL, 0, 5, motor_off_callback },
 851         { NULL, NULL, 0, 6, motor_off_callback },
 852         { NULL, NULL, 0, 7, motor_off_callback }
 853 };
 854 
 855 /* schedules motor off */
 856 static void floppy_off(unsigned int drive)
     /* [previous][next][first][last][top][bottom][index][help] */
 857 {
 858         unsigned long volatile delta;
 859         register int fdc=FDC(drive);
 860 
 861         if( !(FDCS->dor & ( 0x10 << UNIT(drive))))
 862                 return;
 863 
 864         del_timer(motor_off_timer+drive);
 865 
 866         /* make spindle stop in a position which minimizes spinup time
 867          * next time */
 868         if (UDP->rps ){
 869                 delta = jiffies - UDRS->first_read_date + HZ -
 870                         UDP->spindown_offset;
 871                 delta = (( delta * UDP->rps) % HZ ) / UDP->rps;
 872                 motor_off_timer[drive].expires = jiffies + UDP->spindown - delta;
 873         }
 874         add_timer(motor_off_timer+drive);
 875 }
 876 
 877 /*
 878  * cycle through all N_DRIVE floppy drives, for disk change testing.
 879  * stopping at current drive. This is done before any long operation, to
 880  * be sure to have up to date disk change information.
 881  */
 882 static void scandrives(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 883 {
 884         int i, drive, saved_drive;
 885         
 886         if (DP->select_delay)
 887                 return;
 888 
 889         saved_drive = current_drive;
 890         for(i=0; i< N_DRIVE; i++){
 891                 drive = (saved_drive + i + 1 ) % N_DRIVE;
 892                 if ( UDRS->fd_ref == 0 || UDP->select_delay != 0)
 893                         continue; /* skip closed drives */
 894                 set_fdc(drive);
 895                 if(! (set_dor( fdc, ~3, UNIT(drive) | ( 0x10 << UNIT(drive))) &
 896                       (0x10 << UNIT(drive))))
 897                         /* switch the motor off again, if it was off to
 898                          * begin with */
 899                         set_dor( fdc, ~( 0x10 << UNIT(drive) ), 0 );
 900         }
 901         set_fdc(saved_drive);
 902 }
 903 
 904 static struct timer_list fd_timer ={ NULL, NULL, 0, 0, 0 };
 905 
 906 /* this function makes sure that the disk stays in the drive during the
 907  * transfer */
 908 static void fd_watchdog(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 909 {
 910 #ifdef DCL_DEBUG
 911         if (DP->flags & FD_DEBUG){
 912                 DPRINT("calling disk change from watchdog\n");
 913         }
 914 #endif
 915 
 916         if ( disk_change(current_drive) ){
 917                 DPRINT("disk removed during i/o\n");
 918                 floppy_shutdown();
 919         } else {                
 920                 del_timer(&fd_timer);
 921                 fd_timer.function = (timeout_fn) fd_watchdog;
 922                 fd_timer.expires = jiffies + HZ / 10;
 923                 add_timer(&fd_timer);
 924         }
 925 }
 926 
 927 static void main_command_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 928 {
 929         del_timer(&fd_timer);
 930         cont->interrupt();
 931 }
 932 
 933 /* waits for a delay (spinup or select) to pass */
 934 static int wait_for_completion(int delay, timeout_fn function)
     /* [previous][next][first][last][top][bottom][index][help] */
 935 {
 936         if ( FDCS->reset ){
 937                 reset_fdc(); /* do the reset during sleep to win time
 938                               * if we don't need to sleep, it's a good
 939                               * occasion anyways */
 940                 return 1;
 941         }
 942 
 943         if ( jiffies < delay ){
 944                 del_timer(&fd_timer);
 945                 fd_timer.function = function;
 946                 fd_timer.expires = delay;
 947                 add_timer(&fd_timer);
 948                 return 1;
 949         }
 950         return 0;
 951 }
 952 
 953 static int hlt_disabled=0;
 954 static void floppy_disable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 955 {
 956         unsigned long flags;
 957         save_flags(flags);
 958         cli();
 959         if(!hlt_disabled){
 960                 hlt_disabled=1;
 961 #ifdef HAVE_DISABLE_HLT
 962                 disable_hlt();
 963 #endif
 964         }
 965         restore_flags(flags);
 966 }
 967 
 968 static void floppy_enable_hlt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 969 {
 970         unsigned long flags;
 971         save_flags(flags);
 972         cli();
 973         if(hlt_disabled){
 974                 hlt_disabled=0;
 975 #ifdef HAVE_DISABLE_HLT
 976                 enable_hlt();
 977 #endif
 978         }
 979         restore_flags(flags);
 980 }
 981                 
 982 
 983 static void setup_DMA(void)
     /* [previous][next][first][last][top][bottom][index][help] */
 984 {
 985 #ifdef CONFIG_FLOPPY_SANITY
 986         if (raw_cmd.length == 0){
 987                 int i;
 988 
 989                 printk("zero dma transfer size:");
 990                 for(i=0; i< raw_cmd.cmd_count; i++)
 991                         printk("%x,", raw_cmd.cmd[i]);
 992                 printk("\n");
 993                 cont->done(0);
 994                 FDCS->reset = 1;
 995                 return;
 996         }
 997         if ((!CURRENT ||
 998              CURRENT->buffer != current_addr ||
 999              raw_cmd.length > 512 * CURRENT->nr_sectors) &&
1000             (current_addr < floppy_track_buffer ||
1001              current_addr + raw_cmd.length >
1002              floppy_track_buffer + 1024 * max_buffer_sectors)){
1003                 printk("bad address. start=%p lg=%lx tb=%p\n",
1004                        current_addr, raw_cmd.length, floppy_track_buffer);
1005                 if ( CURRENT ){
1006                         printk("buffer=%p nr=%lx cnr=%lx\n",
1007                                CURRENT->buffer, CURRENT->nr_sectors,
1008                                CURRENT->current_nr_sectors);
1009                 }
1010                 cont->done(0);
1011                 FDCS->reset=1;
1012                 return;
1013         }
1014         if ((long) current_addr % 512 ){
1015                 printk("non aligned address: %p\n", current_addr );
1016                 cont->done(0);
1017                 FDCS->reset=1;
1018                 return;
1019         }
1020         if (CROSS_64KB(current_addr, raw_cmd.length)) {
1021                 printk("DMA crossing 64-K boundary %p-%p\n",
1022                        current_addr, current_addr + raw_cmd.length);
1023                 cont->done(0);
1024                 FDCS->reset=1;
1025                 return;
1026         }
1027 #endif
1028         cli();
1029         disable_dma(FLOPPY_DMA);
1030         clear_dma_ff(FLOPPY_DMA);
1031         set_dma_mode(FLOPPY_DMA,
1032                      (raw_cmd.flags & FD_RAW_READ)?
1033                      DMA_MODE_READ : DMA_MODE_WRITE);
1034         set_dma_addr(FLOPPY_DMA, virt_to_bus(current_addr));
1035         set_dma_count(FLOPPY_DMA, raw_cmd.length);
1036         enable_dma(FLOPPY_DMA);
1037         sti();
1038         floppy_disable_hlt();
1039 }
1040 
1041 /* sends a command byte to the fdc */
1042 static int output_byte(char byte)
     /* [previous][next][first][last][top][bottom][index][help] */
1043 {
1044         int counter;
1045         unsigned char status = 0;       /* keep gcc quiet */
1046         unsigned char rstatus;
1047 
1048         if (FDCS->reset)
1049                 return -1;
1050         for(counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1051                 rstatus = inb_p(FD_STATUS); 
1052                 status =  rstatus &(STATUS_READY|STATUS_DIR|STATUS_DMA);
1053                 if (!(status & STATUS_READY))
1054                         continue;
1055                 if (status == STATUS_READY){
1056                         outb_p(byte,FD_DATA);
1057 
1058 #ifdef CONFIG_FLOPPY_SANITY
1059                         output_log[output_log_pos].data = byte;
1060                         output_log[output_log_pos].status = rstatus;
1061                         output_log[output_log_pos].jiffies = jiffies;
1062                         output_log_pos = (output_log_pos + 1) % OLOGSIZE;
1063 #endif
1064                         return 0;
1065                 } else
1066                         break;
1067         }
1068         FDCS->reset = 1;
1069         if ( !initialising )
1070                 DPRINT2("Unable to send byte %x to FDC. Status=%x\n",
1071                         byte, status);
1072         return -1;
1073 }
1074 #define LAST_OUT(x) if(output_byte(x)){ reset_fdc();return;}
1075 
1076 /* gets the response from the fdc */
1077 static int result(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1078 {
1079         int i = 0, counter, status = 0;
1080 
1081         if (FDCS->reset)
1082                 return -1;
1083         for (counter = 0 ; counter < 10000 && !FDCS->reset ; counter++) {
1084                 status = inb_p(FD_STATUS)&
1085                         (STATUS_DIR|STATUS_READY|STATUS_BUSY|STATUS_DMA);
1086                 if (!(status & STATUS_READY))
1087                         continue;
1088                 if (status == STATUS_READY){
1089 #ifdef CONFIG_FLOPPY_SANITY
1090                         resultjiffies = jiffies;
1091                         resultsize = i;
1092 #endif
1093                         return i;
1094                 }
1095                 if (status & STATUS_DMA )
1096                         break;
1097                 if (status == (STATUS_DIR|STATUS_READY|STATUS_BUSY)) {
1098                         if (i >= MAX_REPLIES) {
1099                                 DPRINT("floppy_stat reply overrun\n");
1100                                 break;
1101                         }
1102                         reply_buffer[i++] = inb_p(FD_DATA);
1103                 }
1104         }
1105         FDCS->reset = 1;
1106         if ( !initialising )
1107                 DPRINT3("Getstatus times out (%x) on fdc %d [%d]\n",
1108                         status, fdc, i);
1109         return -1;
1110 }
1111 
1112 /* Set perpendicular mode as required, based on data rate, if supported.
1113  * 82077 Now tested. 1Mbps data rate only possible with 82077-1.
1114  */
1115 static inline void perpendicular_mode(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1116 {
1117         unsigned char perp_mode;
1118 
1119         if (!floppy)
1120                 return;
1121         if (floppy->rate & 0x40){
1122                 switch(raw_cmd.rate){
1123                 case 0:
1124                         perp_mode=2;
1125                         break;
1126                 case 3:
1127                         perp_mode=3;
1128                         break;
1129                 default:
1130                         DPRINT("Invalid data rate for perpendicular mode!\n");
1131                         cont->done(0);
1132                         FDCS->reset = 1; /* convenient way to return to
1133                                           * redo without to much hassle (deep
1134                                           * stack et al. */
1135                         return;
1136                 }
1137         } else
1138                 perp_mode = 0;
1139                         
1140         if ( FDCS->perp_mode == perp_mode )
1141                 return;
1142         if (FDCS->version >= FDC_82077_ORIG && FDCS->has_fifo) {
1143                 output_byte(FD_PERPENDICULAR);
1144                 output_byte(perp_mode);
1145                 FDCS->perp_mode = perp_mode;
1146         } else if (perp_mode) {
1147                 DPRINT("perpendicular mode not supported by this FDC.\n");
1148         }
1149 } /* perpendicular_mode */
1150 
1151 #define NOMINAL_DTR 500
1152 
1153 /* Issue a "SPECIFY" command to set the step rate time, head unload time,
1154  * head load time, and DMA disable flag to values needed by floppy.
1155  *
1156  * The value "dtr" is the data transfer rate in Kbps.  It is needed
1157  * to account for the data rate-based scaling done by the 82072 and 82077
1158  * FDC types.  This parameter is ignored for other types of FDCs (i.e.
1159  * 8272a).
1160  *
1161  * Note that changing the data transfer rate has a (probably deleterious)
1162  * effect on the parameters subject to scaling for 82072/82077 FDCs, so
1163  * fdc_specify is called again after each data transfer rate
1164  * change.
1165  *
1166  * srt: 1000 to 16000 in microseconds
1167  * hut: 16 to 240 milliseconds
1168  * hlt: 2 to 254 milliseconds
1169  *
1170  * These values are rounded up to the next highest available delay time.
1171  */
1172 static void fdc_specify(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1173 {
1174         unsigned char spec1, spec2;
1175         int srt, hlt, hut;
1176         unsigned long dtr = NOMINAL_DTR;
1177         unsigned long scale_dtr = NOMINAL_DTR;
1178         int hlt_max_code = 0x7f;
1179         int hut_max_code = 0xf;
1180 
1181         if (FDCS->need_configure && FDCS->has_fifo) {
1182                 if ( FDCS->reset )
1183                         return;
1184                 /* Turn on FIFO for 82077-class FDC (improves performance) */
1185                 /* TODO: lock this in via LOCK during initialization */
1186                 output_byte(FD_CONFIGURE);
1187                 output_byte(0);
1188                 output_byte(0x2A);      /* FIFO on, polling off, 10 byte threshold */
1189                 output_byte(0);         /* precompensation from track 0 upwards */
1190                 if ( FDCS->reset ){
1191                         FDCS->has_fifo=0;
1192                         return;
1193                 }
1194                 FDCS->need_configure = 0;
1195                 /*DPRINT("FIFO enabled\n");*/
1196         }
1197 
1198         switch (raw_cmd.rate & 0x03) {
1199         case 3:
1200                 dtr = 1000;
1201                 break;
1202         case 1:
1203                 dtr = 300;
1204                 break;
1205         case 2:
1206                 dtr = 250;
1207                 break;
1208         }
1209 
1210         if (FDCS->version >= FDC_82072) {
1211                 scale_dtr = dtr;
1212                 hlt_max_code = 0x00; /* 0==256msec*dtr0/dtr (not linear!) */
1213                 hut_max_code = 0x0; /* 0==256msec*dtr0/dtr (not linear!) */
1214         }
1215 
1216         /* Convert step rate from microseconds to milliseconds and 4 bits */
1217         srt = 16 - (DP->srt*scale_dtr/1000 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1218         if (srt > 0xf)
1219                 srt = 0xf;
1220         else if (srt < 0)
1221                 srt = 0;
1222 
1223         hlt = (DP->hlt*scale_dtr/2 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1224         if (hlt < 0x01)
1225                 hlt = 0x01;
1226         else if (hlt > 0x7f)
1227                 hlt = hlt_max_code;
1228 
1229         hut = (DP->hut*scale_dtr/16 + NOMINAL_DTR - 1)/NOMINAL_DTR;
1230         if (hut < 0x1)
1231                 hut = 0x1;
1232         else if (hut > 0xf)
1233                 hut = hut_max_code;
1234 
1235         spec1 = (srt << 4) | hut;
1236         spec2 = (hlt << 1);
1237 
1238         /* If these parameters did not change, just return with success */
1239         if (FDCS->spec1 != spec1 || FDCS->spec2 != spec2) {
1240                 /* Go ahead and set spec1 and spec2 */
1241                 output_byte(FD_SPECIFY);
1242                 output_byte(FDCS->spec1 = spec1);
1243                 output_byte(FDCS->spec2 = spec2);
1244         }
1245 } /* fdc_specify */
1246 
1247 /* Set the FDC's data transfer rate on behalf of the specified drive.
1248  * NOTE: with 82072/82077 FDCs, changing the data rate requires a reissue
1249  * of the specify command (i.e. using the fdc_specify function).
1250  */
1251 static int fdc_dtr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1252 {
1253         /* If data rate not already set to desired value, set it. */
1254         if ( raw_cmd.rate == FDCS->dtr)
1255                 return 0;
1256         
1257         /* Set dtr */
1258         outb_p(raw_cmd.rate, FD_DCR);
1259         
1260         /* TODO: some FDC/drive combinations (C&T 82C711 with TEAC 1.2MB)
1261          * need a stabilization period of several milliseconds to be
1262          * enforced after data rate changes before R/W operations.
1263          * Pause 5 msec to avoid trouble. (Needs to be 2 jiffies)
1264          */
1265         FDCS->dtr = raw_cmd.rate;
1266         return(wait_for_completion(jiffies+2*HZ/100,
1267                                    (timeout_fn) floppy_ready));
1268 } /* fdc_dtr */
1269 
1270 static void tell_sector(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1271 {
1272         printk(": track %d, head %d, sector %d, size %d",
1273                R_TRACK, R_HEAD, R_SECTOR, R_SIZECODE);
1274 } /* tell_sector */
1275 
1276 
1277 /*
1278  * Ok, this error interpreting routine is called after a
1279  * DMA read/write has succeeded
1280  * or failed, so we check the results, and copy any buffers.
1281  * hhb: Added better error reporting.
1282  * ak: Made this into a separate routine.
1283  */
1284 static int interpret_errors(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1285 {
1286         char bad;
1287 
1288         if (inr!=7) {
1289                 DPRINT("-- FDC reply error");
1290                 FDCS->reset = 1;
1291                 return 1;
1292         }
1293 
1294         /* check IC to find cause of interrupt */
1295         switch ((ST0 & ST0_INTR)>>6) {
1296                 case 1: /* error occurred during command execution */
1297                         bad = 1;
1298                         if (ST1 & ST1_WP) {
1299                                 DPRINT("Drive is write protected\n");
1300                                 CLEARF(FD_DISK_WRITABLE);
1301                                 cont->done(0);
1302                                 bad = 2;
1303                         } else if (ST1 & ST1_ND) {
1304                                 SETF(FD_NEED_TWADDLE);
1305                         } else if (ST1 & ST1_OR) {
1306                                 if (DP->flags & FTD_MSG )
1307                                         DPRINT("Over/Underrun - retrying\n");
1308                                 bad = 0;
1309                         }else if(*errors >= DP->max_errors.reporting){
1310                                 DPRINT("");
1311                                 if (ST0 & ST0_ECE) {
1312                                         printk("Recalibrate failed!");
1313                                 } else if (ST2 & ST2_CRC) {
1314                                         printk("data CRC error");
1315                                         tell_sector();
1316                                 } else if (ST1 & ST1_CRC) {
1317                                         printk("CRC error");
1318                                         tell_sector();
1319                                 } else if ((ST1 & (ST1_MAM|ST1_ND)) || (ST2 & ST2_MAM)) {
1320                                         if (!probing) {
1321                                                 printk("sector not found");
1322                                                 tell_sector();
1323                                         } else
1324                                                 printk("probe failed...");
1325                                 } else if (ST2 & ST2_WC) {      /* seek error */
1326                                         printk("wrong cylinder");
1327                                 } else if (ST2 & ST2_BC) {      /* cylinder marked as bad */
1328                                         printk("bad cylinder");
1329                                 } else {
1330                                         printk("unknown error. ST[0..2] are: 0x%x 0x%x 0x%x", ST0, ST1, ST2);
1331                                         tell_sector();
1332                                 }
1333                                 printk("\n");
1334 
1335                         }
1336                         if ( ST2 & ST2_WC || ST2 & ST2_BC)
1337                                 /* wrong cylinder => recal */
1338                                 DRS->track = NEED_2_RECAL;
1339                         return bad;
1340                 case 2: /* invalid command given */
1341                         DPRINT("Invalid FDC command given!\n");
1342                         cont->done(0);
1343                         return 2;
1344                 case 3:
1345                         DPRINT("Abnormal termination caused by polling\n");
1346                         cont->error();
1347                         return 2;
1348                 default: /* (0) Normal command termination */
1349                         return 0;
1350         }
1351 }
1352 
1353 /*
1354  * This routine is called when everything should be correctly set up
1355  * for the transfer (ie floppy motor is on, the correct floppy is
1356  * selected, and the head is sitting on the right track).
1357  */
1358 static void setup_rw_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1359 {
1360         int i,ready_date,r, flags,dflags;
1361         timeout_fn function;
1362 
1363         flags = raw_cmd.flags;
1364         if ( flags & ( FD_RAW_READ | FD_RAW_WRITE))
1365                 flags |= FD_RAW_INTR;
1366 
1367         if ((flags & FD_RAW_SPIN) && !(flags & FD_RAW_NO_MOTOR)){
1368                 ready_date = DRS->spinup_date + DP->spinup;             
1369                 /* If spinup will take a long time, rerun scandrives
1370                  * again just before spinup completion. Beware that
1371                  * after scandrives, we must again wait for selection.
1372                  */
1373                 if ( ready_date > jiffies + DP->select_delay){
1374                         ready_date -= DP->select_delay;
1375                         function = (timeout_fn) floppy_start;
1376                 } else
1377                         function = (timeout_fn) setup_rw_floppy;
1378 
1379                 /* wait until the floppy is spinning fast enough */
1380                 if (wait_for_completion(ready_date,function))
1381                         return;
1382         }
1383         dflags = DRS->flags;
1384 
1385         if ( (flags & FD_RAW_READ) || (flags & FD_RAW_WRITE))
1386                 setup_DMA();
1387         
1388         if ( flags & FD_RAW_INTR )
1389                 SET_INTR(main_command_interrupt);
1390 
1391         r=0;
1392         for(i=0; i< raw_cmd.cmd_count; i++)
1393                 r|=output_byte( raw_cmd.cmd[i] );
1394 
1395 #ifdef DEBUGT
1396         debugt("rw_command: ");
1397 #endif
1398         if ( r ){
1399                 reset_fdc();
1400                 return;
1401         }
1402 
1403         if ( ! ( flags & FD_RAW_INTR )){
1404                 inr = result();
1405                 cont->interrupt();
1406         } else if ( flags & FD_RAW_NEED_DISK )
1407                 fd_watchdog();
1408 }
1409 
1410 static int blind_seek;
1411 
1412 /*
1413  * This is the routine called after every seek (or recalibrate) interrupt
1414  * from the floppy controller.
1415  */
1416 static void seek_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1417 {
1418 #ifdef DEBUGT
1419         debugt("seek interrupt:");
1420 #endif
1421         if (inr != 2 || (ST0 & 0xF8) != 0x20 ) {
1422                 DPRINT("seek failed\n");
1423                 DRS->track = NEED_2_RECAL;
1424                 cont->error();
1425                 cont->redo();
1426                 return;
1427         }
1428         if (DRS->track >= 0 && DRS->track != ST1 && !blind_seek){
1429 #ifdef DCL_DEBUG
1430                 if (DP->flags & FD_DEBUG){
1431                         DPRINT("clearing NEWCHANGE flag because of effective seek\n");
1432                         DPRINT1("jiffies=%ld\n", jiffies);
1433                 }
1434 #endif
1435                 CLEARF(FD_DISK_NEWCHANGE); /* effective seek */
1436                 DRS->select_date = jiffies;
1437         }
1438         DRS->track = ST1;
1439         floppy_ready();
1440 }
1441 
1442 static void check_wp(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1443 {
1444         if (TESTF(FD_VERIFY)) {
1445                 /* check write protection */
1446                 output_byte( FD_GETSTATUS );
1447                 output_byte( UNIT(current_drive) );
1448                 if ( result() != 1 ){
1449                         FDCS->reset = 1;
1450                         return;
1451                 }
1452                 CLEARF(FD_VERIFY);
1453                 CLEARF(FD_NEED_TWADDLE);
1454 #ifdef DCL_DEBUG
1455                 if (DP->flags & FD_DEBUG){
1456                         DPRINT("checking whether disk is write protected\n");
1457                         DPRINT1("wp=%x\n",ST3 & 0x40);
1458                 }
1459 #endif
1460                 if (!( ST3  & 0x40))
1461                         SETF(FD_DISK_WRITABLE);
1462                 else
1463                         CLEARF(FD_DISK_WRITABLE);
1464         }
1465 }
1466 
1467 static void seek_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1468 {
1469         int track;
1470 
1471         blind_seek=0;
1472 
1473 #ifdef DCL_DEBUG
1474         if (DP->flags & FD_DEBUG){
1475                 DPRINT("calling disk change from seek\n");
1476         }
1477 #endif
1478 
1479         if (!TESTF(FD_DISK_NEWCHANGE) &&
1480             disk_change(current_drive) &&
1481             (raw_cmd.flags & FD_RAW_NEED_DISK)){
1482                 /* the media changed flag should be cleared after the seek.
1483                  * If it isn't, this means that there is really no disk in
1484                  * the drive.
1485                  */
1486                 SETF(FD_DISK_CHANGED);
1487                 cont->done(0);
1488                 cont->redo();
1489                 return;
1490         }
1491         if ( DRS->track <= NEED_1_RECAL ){
1492                 recalibrate_floppy();
1493                 return;
1494         } else if (TESTF(FD_DISK_NEWCHANGE) &&
1495                    (raw_cmd.flags & FD_RAW_NEED_DISK) &&
1496                    (DRS->track <= NO_TRACK || DRS->track == raw_cmd.track)) {
1497                 /* we seek to clear the media-changed condition. Does anybody
1498                  * know a more elegant way, which works on all drives? */
1499                 if ( raw_cmd.track )
1500                         track = raw_cmd.track - 1;
1501                 else {
1502                         if(DP->flags & FD_SILENT_DCL_CLEAR){
1503                                 set_dor(fdc, ~(0x10 << UNIT(current_drive)), 0);
1504                                 blind_seek = 1;
1505                                 raw_cmd.flags |= FD_RAW_NEED_SEEK;
1506                         }
1507                         track = 1;
1508                 }
1509         } else {
1510                 check_wp();
1511                 if (raw_cmd.track != DRS->track &&
1512                     (raw_cmd.flags & FD_RAW_NEED_SEEK))
1513                         track = raw_cmd.track;
1514                 else {
1515                         setup_rw_floppy();
1516                         return;
1517                 }
1518         }
1519 
1520         SET_INTR(seek_interrupt);
1521         output_byte(FD_SEEK);
1522         output_byte(UNIT(current_drive));
1523         LAST_OUT(track);
1524 #ifdef DEBUGT
1525         debugt("seek command:");
1526 #endif
1527 }
1528 
1529 static void recal_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1530 {
1531 #ifdef DEBUGT
1532         debugt("recal interrupt:");
1533 #endif
1534         if (inr !=2 )
1535                 FDCS->reset = 1;
1536         else if (ST0 & ST0_ECE) {
1537                 switch(DRS->track){
1538                 case NEED_1_RECAL:
1539 #ifdef DEBUGT
1540                         debugt("recal interrupt need 1 recal:");
1541 #endif
1542                         /* after a second recalibrate, we still haven't
1543                          * reached track 0. Probably no drive. Raise an
1544                          * error, as failing immediately might upset 
1545                          * computers possessed by the Devil :-) */
1546                         cont->error();
1547                         cont->redo();
1548                         return;
1549                 case NEED_2_RECAL:
1550 #ifdef DEBUGT
1551                         debugt("recal interrupt need 2 recal:");
1552 #endif
1553                         /* If we already did a recalibrate, and we are not at
1554                          * track 0, this means we have moved. (The only way
1555                          * not to move at recalibration is to be already at
1556                          * track 0.) Clear the new change flag
1557                          */
1558 #ifdef DCL_DEBUG
1559                         if (DP->flags & FD_DEBUG){
1560                                 DPRINT("clearing NEWCHANGE flag because of second recalibrate\n");
1561                         }
1562 #endif
1563 
1564                         CLEARF(FD_DISK_NEWCHANGE);
1565                         DRS->select_date = jiffies;
1566                         /* fall through */
1567                 default:
1568 #ifdef DEBUGT
1569                         debugt("recal interrupt default:");
1570 #endif
1571                         /* Recalibrate moves the head by at most 80 steps. If
1572                          * after one recalibrate we don't have reached track
1573                          * 0, this might mean that we started beyond track 80.
1574                          * Try again.
1575                          */
1576                         DRS->track = NEED_1_RECAL;
1577                         break;
1578                 }
1579         } else
1580                 DRS->track = ST1;
1581         floppy_ready();
1582 }
1583 
1584 /*
1585  * Unexpected interrupt - Print as much debugging info as we can...
1586  * All bets are off...
1587  */
1588 static void unexpected_floppy_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1589 {
1590         int i;
1591         if ( initialising )
1592                 return;
1593         if(print_unex){
1594                 DPRINT("unexpected interrupt\n");
1595                 if ( inr >= 0 )
1596                         for(i=0; i<inr; i++)
1597                                 printk("%d %x\n", i, reply_buffer[i] );
1598         }
1599         while(1){
1600                 output_byte(FD_SENSEI);
1601                 inr=result();
1602                 if ( inr != 2 )
1603                         break;
1604                 if(print_unex){
1605                         printk("sensei\n");
1606                         for(i=0; i<inr; i++)
1607                                 printk("%d %x\n", i, reply_buffer[i] );
1608                 }
1609         }
1610         FDCS->reset = 1;
1611 }
1612 
1613 struct tq_struct floppy_tq = 
1614 { 0, 0, (void *) (void *) unexpected_floppy_interrupt, 0 };
1615 
1616 /* interrupt handler */
1617 static void floppy_interrupt(int irq, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
1618 {
1619         void (*handler)(void) = DEVICE_INTR;
1620 
1621         lasthandler = handler;
1622         interruptjiffies = jiffies;
1623 
1624         floppy_enable_hlt();
1625         CLEAR_INTR;
1626         if ( fdc >= N_FDC || FDCS->address == -1){
1627                 /* we don't even know which FDC is the culprit */
1628                 printk("DOR0=%x\n", fdc_state[0].dor);
1629                 printk("floppy interrupt on bizarre fdc %d\n",fdc);
1630                 printk("handler=%p\n", handler);
1631                 is_alive("bizarre fdc");
1632                 return;
1633         }
1634         inr = result();
1635         if (!handler){
1636                 unexpected_floppy_interrupt();
1637                 is_alive("unexpected");
1638                 return;
1639         }
1640         if ( inr == 0 ){
1641                 do {
1642                         output_byte(FD_SENSEI);
1643                         inr = result();
1644                 } while ( (ST0 & 0x83) != UNIT(current_drive) && inr == 2);
1645         }
1646         floppy_tq.routine = (void *)(void *) handler;
1647         queue_task_irq(&floppy_tq, &tq_timer);
1648         is_alive("normal interrupt end");
1649 }
1650 
1651 static void recalibrate_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1652 {
1653 #ifdef DEBUGT
1654         debugt("recalibrate floppy:");
1655 #endif
1656         SET_INTR(recal_interrupt);
1657         output_byte(FD_RECALIBRATE);
1658         LAST_OUT(UNIT(current_drive));
1659 }
1660 
1661 /*
1662  * Must do 4 FD_SENSEIs after reset because of ``drive polling''.
1663  */
1664 static void reset_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1665 {
1666 #ifdef DEBUGT
1667         debugt("reset interrupt:");
1668 #endif
1669         fdc_specify();          /* reprogram fdc */
1670         result();               /* get the status ready for set_fdc */
1671         if ( FDCS->reset )
1672                 cont->error(); /* a reset just after a reset. BAD! */
1673         cont->redo();
1674 }
1675 
1676 /*
1677  * reset is done by pulling bit 2 of DOR low for a while (old FDC's),
1678  * or by setting the self clearing bit 7 of STATUS (newer FDC's)
1679  */
1680 static void reset_fdc(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1681 {
1682         SET_INTR(reset_interrupt);
1683         FDCS->reset = 0;
1684         reset_fdc_info(0);
1685         if ( FDCS->version >= FDC_82077 )
1686                 outb_p(0x80 | ( FDCS->dtr &3), FD_STATUS);
1687         else {
1688                 outb_p(FDCS->dor & ~0x04, FD_DOR);
1689                 udelay(FD_RESET_DELAY);
1690                 outb(FDCS->dor, FD_DOR);
1691         }
1692 }
1693 
1694 static void empty(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1695 {
1696 }
1697 
1698 void show_floppy(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1699 {
1700         int i;
1701 
1702         printk("\n");
1703         printk("floppy driver state\n");
1704         printk("-------------------\n");
1705         printk("now=%ld last interrupt=%d last called handler=%p\n", 
1706                jiffies, interruptjiffies, lasthandler);
1707 
1708 
1709 #ifdef CONFIG_FLOPPY_SANITY
1710         printk("timeout_message=%s\n", timeout_message);
1711         printk("last output bytes:\n");
1712         for(i=0; i < OLOGSIZE; i++)
1713                 printk("%2x %2x %ld\n",                
1714                        output_log[(i+output_log_pos) % OLOGSIZE].data,
1715                        output_log[(i+output_log_pos) % OLOGSIZE].status,
1716                        output_log[(i+output_log_pos) % OLOGSIZE].jiffies);
1717         printk("last result at %d\n", resultjiffies);
1718         printk("last redo_fd_request at %d\n", lastredo);
1719         for(i=0; i<resultsize; i++){
1720                 printk("%2x ", reply_buffer[i]);
1721         }
1722         printk("\n");
1723 #endif
1724 
1725 #if 0
1726         for(i=0; i<N_FDC; i++){
1727                 if(FDCS->address != -1){
1728                         printk("dor %d = %x\n", i, fdc_state[i].dor );
1729                         outb_p(fdc_state[i].address+2, fdc_state[i].dor);
1730                         udelay(1000); /* maybe we'll catch an interrupt... */
1731                 }
1732         }
1733 #endif
1734         printk("status=%x\n", inb_p(FD_STATUS));
1735         printk("fdc_busy=%d\n", fdc_busy);
1736         if( DEVICE_INTR)
1737                 printk("DEVICE_INTR=%p\n", DEVICE_INTR);
1738         if(floppy_tq.sync)
1739                 printk("floppy_tq.routine=%p\n", floppy_tq.routine);
1740         if(fd_timer.prev)
1741                 printk("fd_timer.function=%p\n", fd_timer.function);
1742         if(fd_timeout.prev){
1743                 printk("timer_table=%p\n",fd_timeout.function);
1744                 printk("expires=%ld\n",fd_timeout.expires-jiffies);
1745                 printk("now=%ld\n",jiffies);
1746         }
1747         printk("cont=%p\n", cont);
1748         printk("CURRENT=%p\n", CURRENT);
1749         printk("command_status=%d\n", command_status);
1750         printk("\n");
1751 }
1752 
1753 static void floppy_shutdown(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1754 {
1755         if(!initialising)
1756                 show_floppy();
1757         CLEAR_INTR;
1758         floppy_tq.routine = (void *)(void *) empty;
1759         del_timer( &fd_timer);
1760 
1761         floppy_enable_hlt();
1762         disable_dma(FLOPPY_DMA);
1763         /* avoid dma going to a random drive after shutdown */
1764 
1765         if(!initialising)
1766                 DPRINT("floppy timeout\n");
1767         FDCS->reset = 1;
1768         if (cont){
1769                 cont->done(0);
1770                 cont->redo(); /* this will recall reset when needed */
1771         } else {
1772                 printk("no cont in shutdown!\n");
1773                 process_fd_request();
1774         }
1775         is_alive("floppy shutdown");
1776 }
1777 /*typedef void (*timeout_fn)(unsigned long);*/
1778 
1779 /* start motor, check media-changed condition and write protection */
1780 static int start_motor( void (*function)(void)  )
     /* [previous][next][first][last][top][bottom][index][help] */
1781 {
1782         int mask, data;
1783 
1784         mask = 0xfc;
1785         data = UNIT(current_drive);
1786         if (!(raw_cmd.flags & FD_RAW_NO_MOTOR)){
1787                 if(!(FDCS->dor & ( 0x10 << UNIT(current_drive) ) )){
1788                         set_debugt();
1789                         /* no read since this drive is running */
1790                         DRS->first_read_date = 0;
1791                         /* note motor start time if motor is not yet running */
1792                         DRS->spinup_date = jiffies;
1793                         data |= (0x10 << UNIT(current_drive));
1794                 }
1795         } else
1796                 if (FDCS->dor & ( 0x10 << UNIT(current_drive) ) )
1797                         mask &= ~(0x10 << UNIT(current_drive));
1798 
1799         /* starts motor and selects floppy */
1800         del_timer(motor_off_timer + current_drive);
1801         set_dor( fdc, mask, data);
1802 
1803         /* wait_for_completion also schedules reset if needed. */
1804         return(wait_for_completion(DRS->select_date+DP->select_delay,
1805                                    (timeout_fn) function));
1806 }
1807 
1808 static void floppy_ready(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1809 {
1810         CHECK_RESET;
1811         if(start_motor(floppy_ready)) return;
1812         if(fdc_dtr()) return;
1813 
1814 #ifdef DCL_DEBUG
1815         if (DP->flags & FD_DEBUG){
1816                 DPRINT("calling disk change from floppy_ready\n");
1817         }
1818 #endif
1819 
1820         if(!(raw_cmd.flags & FD_RAW_NO_MOTOR) &&
1821            disk_change(current_drive) &&
1822            !DP->select_delay)
1823                 twaddle(); /* this clears the dcl on certain drive/controller
1824                             * combinations */
1825 
1826         if ( raw_cmd.flags & (FD_RAW_NEED_SEEK | FD_RAW_NEED_DISK)){
1827                 perpendicular_mode();
1828                 fdc_specify(); /* must be done here because of hut, hlt ... */
1829                 seek_floppy();
1830         } else
1831                 setup_rw_floppy();
1832 }
1833 
1834 static void floppy_start(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1835 {
1836         reschedule_timeout(CURRENTD, "floppy start", 0);
1837 
1838         scandrives();
1839 #ifdef DCL_DEBUG
1840                 if (DP->flags & FD_DEBUG){
1841                         DPRINT("setting NEWCHANGE in floppy_start\n");
1842                 }
1843 #endif
1844         SETF(FD_DISK_NEWCHANGE);
1845         floppy_ready();
1846 }
1847 
1848 /*
1849  * ========================================================================
1850  * here ends the bottom half. Exported routines are:
1851  * floppy_start, floppy_off, floppy_ready, lock_fdc, unlock_fdc, set_fdc,
1852  * start_motor, reset_fdc, reset_fdc_info, interpret_errors.
1853  * Initialisation also uses output_byte, result, set_dor, floppy_interrupt
1854  * and set_dor.
1855  * ========================================================================
1856  */
1857 /*
1858  * General purpose continuations.
1859  * ==============================
1860  */
1861 
1862 static void do_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1863 {
1864         reschedule_timeout(MAXTIMEOUT, "do wakeup", 0);
1865         cont = 0;
1866         command_status += 2;
1867         wake_up(&command_done);
1868 }
1869 
1870 static struct cont_t wakeup_cont={
1871         empty,
1872         do_wakeup,
1873         empty,
1874         (done_f)empty
1875 };
1876 
1877 static int wait_til_done( void (*handler)(void ), int interruptible )
     /* [previous][next][first][last][top][bottom][index][help] */
1878 {
1879         int ret;
1880 
1881         floppy_tq.routine = (void *)(void *) handler;
1882         queue_task(&floppy_tq, &tq_timer);
1883 
1884         cli();
1885         while(command_status < 2 && NO_SIGNAL){
1886                 is_alive("wait_til_done");      
1887                 if (current->pid)
1888                         interruptible_sleep_on(&command_done);
1889                 else {
1890                         sti();
1891                         run_task_queue(&tq_timer);
1892                         cli();
1893                 }
1894         }
1895         if(command_status < 2){
1896                 sti();
1897                 floppy_shutdown();
1898                 process_fd_request();
1899                 return -EINTR;
1900         }
1901         sti();
1902 
1903         if ( FDCS->reset )
1904                 command_status = FD_COMMAND_ERROR;
1905         if ( command_status == FD_COMMAND_OKAY )
1906                 ret=0;
1907         else
1908                 ret=-EIO;
1909         command_status = FD_COMMAND_NONE;
1910         return ret;
1911 }
1912 
1913 static void generic_done(int result)
     /* [previous][next][first][last][top][bottom][index][help] */
1914 {
1915         command_status = result;
1916         cont = &wakeup_cont;
1917 }
1918 
1919 static void generic_success(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1920 {
1921         generic_done(1);
1922 }
1923 
1924 static void generic_failure(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1925 {
1926         generic_done(0);
1927 }
1928 
1929 static void success_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1930 {
1931         generic_success();
1932         do_wakeup();
1933 }
1934 
1935 static void failure_and_wakeup(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1936 {
1937         generic_failure();
1938         do_wakeup();
1939 }
1940 
1941 /*
1942  * formatting and rw support.
1943  * ==========================
1944  */
1945 
1946 static int next_valid_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1947 {
1948         int probed_format;
1949 
1950         probed_format = DRS->probed_format;
1951         while(1){
1952                 if ( probed_format >= 8 ||
1953                     ! DP->autodetect[probed_format] ){
1954                         DRS->probed_format = 0;
1955                         return 1;
1956                 }
1957                 if ( floppy_type[DP->autodetect[probed_format]].sect ){
1958                         DRS->probed_format = probed_format;
1959                         return 0;
1960                 }
1961                 probed_format++;
1962         }
1963 }
1964 
1965 static void bad_flp_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1966 {
1967         if ( probing ){
1968                 DRS->probed_format++;
1969                 if ( !next_valid_format())
1970                         return;
1971         }
1972         (*errors)++;
1973         if (*errors > DRWE->badness)
1974                 DRWE->badness = *errors;
1975         if (*errors > DP->max_errors.abort)
1976                 cont->done(0);
1977         if (*errors > DP->max_errors.reset)
1978                 FDCS->reset = 1;
1979         else if (*errors > DP->max_errors.recal)
1980                 DRS->track = NEED_2_RECAL;
1981 }
1982 
1983 static void set_floppy(kdev_t device)
     /* [previous][next][first][last][top][bottom][index][help] */
1984 {
1985         if (TYPE(device))
1986                 floppy = TYPE(device) + floppy_type;
1987         else
1988                 floppy = current_type[ DRIVE(device) ];
1989 }
1990 
1991 /*
1992  * formatting and support.
1993  * =======================
1994  */
1995 static void format_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
1996 {
1997         switch (interpret_errors()){
1998         case 1:
1999                 cont->error();
2000         case 2:
2001                 break;
2002         case 0:
2003                 cont->done(1);
2004         }
2005         cont->redo();
2006 }
2007 
2008 #define CODE2SIZE (ssize = ( ( 1 << SIZECODE ) + 3 ) >> 2)
2009 #define FM_MODE(x,y) ((y) & ~(((x)->rate & 0x80 ) >>1))
2010 #define CT(x) ( (x) | 0x40 )
2011 static void setup_format_params(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2012 {
2013         struct fparm {
2014                 unsigned char track,head,sect,size;
2015         } *here = (struct fparm *)floppy_track_buffer;
2016         int il,n;
2017         int count,head_shift,track_shift;
2018 
2019         raw_cmd.flags = FD_RAW_WRITE | FD_RAW_INTR | FD_RAW_SPIN |
2020                 /*FD_RAW_NEED_DISK |*/ FD_RAW_NEED_SEEK;
2021         raw_cmd.rate = floppy->rate & 0x3;
2022         raw_cmd.cmd_count = NR_F;
2023         COMMAND = FM_MODE(floppy,FD_FORMAT);
2024         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,format_req.head);
2025         F_SIZECODE = FD_SIZECODE(floppy);
2026         F_SECT_PER_TRACK = floppy->sect << 2 >> F_SIZECODE;
2027         F_GAP = floppy->fmt_gap;
2028         F_FILL = FD_FILL_BYTE;
2029 
2030         current_addr = floppy_track_buffer;
2031         raw_cmd.length = 4 * F_SECT_PER_TRACK;
2032 
2033         /* allow for about 30ms for data transport per track */
2034         head_shift  = (F_SECT_PER_TRACK + 5) / 6;
2035 
2036         /* a ``cylinder'' is two tracks plus a little stepping time */
2037         track_shift = 2 * head_shift + 3;
2038 
2039         /* position of logical sector 1 on this track */
2040         n = (track_shift * format_req.track + head_shift * format_req.head )
2041                 % F_SECT_PER_TRACK;
2042 
2043         /* determine interleave */
2044         il = 1;
2045         if (floppy->sect > DP->interleave_sect && F_SIZECODE == 2)
2046                 il++;
2047 
2048         /* initialize field */
2049         for (count = 0; count < F_SECT_PER_TRACK; ++count) {
2050                 here[count].track = format_req.track;
2051                 here[count].head = format_req.head;
2052                 here[count].sect = 0;
2053                 here[count].size = F_SIZECODE;
2054         }
2055         /* place logical sectors */
2056         for (count = 1; count <= F_SECT_PER_TRACK; ++count) {
2057                 here[n].sect = count;
2058                 n = (n+il) % F_SECT_PER_TRACK;
2059                 if (here[n].sect) { /* sector busy, find next free sector */
2060                         ++n;
2061                         if (n>= F_SECT_PER_TRACK) {
2062                                 n-=F_SECT_PER_TRACK;
2063                                 while (here[n].sect) ++n;
2064                         }
2065                 }
2066         }
2067 }
2068 
2069 static void redo_format(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2070 {
2071         raw_cmd.track = format_req.track << STRETCH(floppy);
2072         buffer_track = -1;
2073         setup_format_params();
2074         floppy_start();
2075 #ifdef DEBUGT
2076         debugt("queue format request");
2077 #endif
2078 }
2079 
2080 static struct cont_t format_cont={
2081         format_interrupt,
2082         redo_format,
2083         bad_flp_intr,
2084         generic_done };
2085 
2086 static int do_format(kdev_t device, struct format_descr *tmp_format_req)
     /* [previous][next][first][last][top][bottom][index][help] */
2087 {
2088         int ret;
2089         int drive=DRIVE(device);
2090 
2091         LOCK_FDC(drive,1);
2092         set_floppy(device);
2093         if (!floppy ||
2094             floppy->track > DP->tracks ||
2095             tmp_format_req->track >= floppy->track ||
2096             tmp_format_req->head >= floppy->head ||
2097             (floppy->sect << 2) % (1 <<  FD_SIZECODE(floppy)) ||
2098             !floppy->fmt_gap) {
2099                 process_fd_request();
2100                 return -EINVAL;
2101         }
2102         format_req = *tmp_format_req;
2103         format_errors = 0;
2104         cont = &format_cont;
2105         errors = &format_errors;
2106         IWAIT(redo_format);
2107         process_fd_request();
2108         return ret;
2109 }
2110 
2111 /*
2112  * Buffer read/write and support
2113  * =============================
2114  */
2115 
2116 /* new request_done. Can handle physical sectors which are smaller than a
2117  * logical buffer */
2118 static void request_done(int uptodate)
     /* [previous][next][first][last][top][bottom][index][help] */
2119 {
2120         int block;
2121 
2122         probing = 0;
2123         reschedule_timeout(MAXTIMEOUT, "request done %d", uptodate);
2124 
2125         if (!CURRENT){
2126                 DPRINT("request list destroyed in floppy request done\n");
2127                 return;
2128         }
2129         if (uptodate){
2130                 /* maintain values for invalidation on geometry
2131                    change */
2132                 block = current_count_sectors + CURRENT->sector;
2133                 if (block > DRS->maxblock)
2134                         DRS->maxblock=block;
2135                 if ( block > floppy->sect)
2136                         DRS->maxtrack = 1;
2137 
2138                 /* unlock chained buffers */
2139                 while (current_count_sectors && CURRENT &&
2140                        current_count_sectors >= CURRENT->current_nr_sectors ){
2141                         current_count_sectors -= CURRENT->current_nr_sectors;
2142                         CURRENT->nr_sectors -= CURRENT->current_nr_sectors;
2143                         CURRENT->sector += CURRENT->current_nr_sectors;
2144                         end_request(1);
2145                 }
2146                 if ( current_count_sectors && CURRENT){
2147                         /* "unlock" last subsector */
2148                         CURRENT->buffer += current_count_sectors <<9;
2149                         CURRENT->current_nr_sectors -= current_count_sectors;
2150                         CURRENT->nr_sectors -= current_count_sectors;
2151                         CURRENT->sector += current_count_sectors;
2152                         return;
2153                 }
2154 
2155                 if ( current_count_sectors && ! CURRENT )
2156                         DPRINT("request list destroyed in floppy request done\n");
2157 
2158         } else {
2159                 if(CURRENT->cmd == WRITE) {
2160                         /* record write error information */
2161                         DRWE->write_errors++;
2162                         if(DRWE->write_errors == 1) {
2163                                 DRWE->first_error_sector = CURRENT->sector;
2164                                 DRWE->first_error_generation = DRS->generation;
2165                         }
2166                         DRWE->last_error_sector = CURRENT->sector;
2167                         DRWE->last_error_generation = DRS->generation;
2168                 }
2169                 end_request(0);
2170         }
2171 }
2172 
2173 /* Interrupt handler evaluating the result of the r/w operation */
2174 static void rw_interrupt(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2175 {
2176         int nr_sectors, ssize;
2177 
2178         if ( ! DRS->first_read_date )
2179                 DRS->first_read_date = jiffies;
2180 
2181         nr_sectors = 0;
2182         CODE2SIZE;
2183         nr_sectors = ((R_TRACK-TRACK)*floppy->head+R_HEAD-HEAD) *
2184                 floppy->sect + ((R_SECTOR-SECTOR) <<  SIZECODE >> 2) -
2185                         (sector_t % floppy->sect) % ssize;
2186 
2187 #ifdef CONFIG_FLOPPY_SANITY
2188         if ( nr_sectors > current_count_sectors + ssize -
2189             (current_count_sectors + sector_t) % ssize +
2190             sector_t % ssize){
2191                 DPRINT2("long rw: %x instead of %lx\n",
2192                         nr_sectors, current_count_sectors);
2193                 printk("rs=%d s=%d\n", R_SECTOR, SECTOR);
2194                 printk("rh=%d h=%d\n", R_HEAD, HEAD);
2195                 printk("rt=%d t=%d\n", R_TRACK, TRACK);
2196                 printk("spt=%d st=%d ss=%d\n", SECT_PER_TRACK,
2197                        sector_t, ssize);
2198         }
2199 #endif
2200         if ( nr_sectors < 0 )
2201                 nr_sectors = 0;
2202         if ( nr_sectors < current_count_sectors )
2203                 current_count_sectors = nr_sectors;
2204 
2205         switch (interpret_errors()){
2206         case 2:
2207                 cont->redo();
2208                 return;
2209         case 1:
2210                 if (  !current_count_sectors){
2211                         cont->error();
2212                         cont->redo();
2213                         return;
2214                 }
2215                 break;
2216         case 0:
2217                 if (  !current_count_sectors){
2218                         cont->redo();
2219                         return;
2220                 }
2221                 current_type[current_drive] = floppy;
2222                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2223                 break;
2224         }
2225 
2226         if (probing) {
2227                 if (DP->flags & FTD_MSG)
2228                         DPRINT2("Auto-detected floppy type %s in fd%d\n",
2229                                 floppy->name,current_drive);
2230                 current_type[current_drive] = floppy;
2231                 floppy_sizes[TOMINOR(current_drive)] = floppy->size >> 1;
2232                 probing = 0;
2233         }
2234 
2235         if ( CT(COMMAND) != FD_READ || current_addr == CURRENT->buffer ){
2236                 /* transfer directly from buffer */
2237                 cont->done(1);
2238         } else if ( CT(COMMAND) == FD_READ){
2239                 buffer_track = raw_cmd.track;
2240                 buffer_drive = current_drive;
2241                 if ( nr_sectors + sector_t > buffer_max )
2242                         buffer_max = nr_sectors + sector_t;
2243         }
2244         cont->redo();
2245 }
2246 
2247 /* Compute maximal contiguous buffer size. */
2248 static int buffer_chain_size(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2249 {
2250         struct buffer_head *bh;
2251         int size;
2252         char *base;
2253 
2254         base = CURRENT->buffer;
2255         size = CURRENT->current_nr_sectors << 9;
2256         bh = CURRENT->bh;
2257 
2258         if (bh){
2259                 bh = bh->b_reqnext;
2260                 while ( bh && bh->b_data == base + size ){
2261                         size += bh->b_size;
2262                         bh = bh->b_reqnext;
2263                 }
2264         }
2265         return size >> 9;
2266 }
2267 
2268 /* Compute the maximal transfer size */
2269 static int transfer_size(int ssize, int max_sector, int max_size)
     /* [previous][next][first][last][top][bottom][index][help] */
2270 {
2271         if ( max_sector > sector_t + max_size)
2272                 max_sector = sector_t + max_size;
2273 
2274         /* alignment */
2275         max_sector -= (max_sector % floppy->sect ) % ssize;
2276 
2277         /* transfer size, beginning not aligned */
2278         current_count_sectors = max_sector - sector_t ;
2279 
2280         return max_sector;
2281 }
2282 
2283 /*
2284  * Move data from/to the track buffer to/from the buffer cache.
2285  */
2286 static void copy_buffer(int ssize, int max_sector, int max_sector_2)
     /* [previous][next][first][last][top][bottom][index][help] */
2287 {
2288         int remaining; /* number of transferred 512-byte sectors */
2289         struct buffer_head *bh;
2290         char *buffer, *dma_buffer;
2291         int size;
2292 
2293         if ( max_sector > max_sector_2 )
2294                 max_sector = max_sector_2;
2295 
2296         max_sector = transfer_size(ssize, max_sector, CURRENT->nr_sectors);
2297 
2298         if (current_count_sectors <= 0 && CT(COMMAND) == FD_WRITE &&
2299             buffer_max > sector_t + CURRENT->nr_sectors){
2300                 current_count_sectors = buffer_max - sector_t;
2301                 if ( current_count_sectors > CURRENT->nr_sectors )
2302                         current_count_sectors = CURRENT->nr_sectors;
2303         }
2304         remaining = current_count_sectors << 9;
2305 #ifdef CONFIG_FLOPPY_SANITY
2306         if ((remaining >> 9) > CURRENT->nr_sectors  && 
2307             CT(COMMAND) == FD_WRITE ){
2308                 DPRINT("in copy buffer\n");
2309                 printk("current_count_sectors=%ld\n", current_count_sectors);
2310                 printk("remaining=%d\n", remaining >> 9);
2311                 printk("CURRENT->nr_sectors=%ld\n",CURRENT->nr_sectors);
2312                 printk("CURRENT->current_nr_sectors=%ld\n",
2313                        CURRENT->current_nr_sectors);
2314                 printk("max_sector=%d\n", max_sector);
2315                 printk("ssize=%d\n", ssize);
2316         }
2317 #endif
2318 
2319         if ( max_sector > buffer_max )
2320                 buffer_max = max_sector;
2321 
2322         dma_buffer = floppy_track_buffer + ((sector_t - buffer_min) << 9);
2323 
2324         bh = CURRENT->bh;
2325         size = CURRENT->current_nr_sectors << 9;
2326         buffer = CURRENT->buffer;
2327 
2328         while ( remaining > 0){
2329                 if ( size > remaining )
2330                         size = remaining;
2331 #ifdef CONFIG_FLOPPY_SANITY
2332                 if (dma_buffer + size >
2333                     floppy_track_buffer + (max_buffer_sectors << 10) ||
2334                     dma_buffer < floppy_track_buffer ){
2335                         DPRINT1("buffer overrun in copy buffer %d\n",
2336                                 (int) ((floppy_track_buffer - dma_buffer) >>9));
2337                         printk("sector_t=%d buffer_min=%d\n",
2338                                sector_t, buffer_min);
2339                         printk("current_count_sectors=%ld\n",
2340                                current_count_sectors);
2341                         if ( CT(COMMAND) == FD_READ )
2342                                 printk("read\n");
2343                         if ( CT(COMMAND) == FD_READ )
2344                                 printk("write\n");
2345                         break;
2346                 }
2347                 if ( ((unsigned long)buffer) % 512 )
2348                         DPRINT1("%p buffer not aligned\n", buffer);
2349 #endif
2350                 if ( CT(COMMAND) == FD_READ )
2351                         memcpy( buffer, dma_buffer, size);
2352                 else
2353                         memcpy( dma_buffer, buffer, size);
2354                 remaining -= size;
2355                 if ( !remaining)
2356                         break;
2357 
2358                 dma_buffer += size;
2359                 bh = bh->b_reqnext;
2360 #ifdef CONFIG_FLOPPY_SANITY
2361                 if ( !bh){
2362                         DPRINT("bh=null in copy buffer after copy\n");
2363                         break;
2364                 }
2365 #endif
2366                 size = bh->b_size;
2367                 buffer = bh->b_data;
2368         }
2369 #ifdef CONFIG_FLOPPY_SANITY
2370         if ( remaining ){
2371                 if ( remaining > 0 )
2372                         max_sector -= remaining >> 9;
2373                 DPRINT1("weirdness: remaining %d\n", remaining>>9);
2374         }
2375 #endif
2376 }
2377 
2378 /*
2379  * Formulate a read/write request.
2380  * this routine decides where to load the data (directly to buffer, or to
2381  * tmp floppy area), how much data to load (the size of the buffer, the whole
2382  * track, or a single sector)
2383  * All floppy_track_buffer handling goes in here. If we ever add track buffer
2384  * allocation on the fly, it should be done here. No other part should need
2385  * modification.
2386  */
2387 
2388 static int make_raw_rw_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2389 {
2390         int aligned_sector_t;
2391         int max_sector, max_size, tracksize, ssize;
2392 
2393         set_fdc(DRIVE(CURRENT->rq_dev));
2394 
2395         raw_cmd.flags = FD_RAW_SPIN | FD_RAW_NEED_DISK | FD_RAW_NEED_DISK |
2396                 FD_RAW_NEED_SEEK;
2397         raw_cmd.cmd_count = NR_RW;
2398         if (CURRENT->cmd == READ){
2399                 raw_cmd.flags |= FD_RAW_READ;
2400                 COMMAND = FM_MODE(floppy,FD_READ);
2401         } else if (CURRENT->cmd == WRITE){
2402                 raw_cmd.flags |= FD_RAW_WRITE;
2403                 COMMAND = FM_MODE(floppy,FD_WRITE);
2404         } else {
2405                 DPRINT("make_raw_rw_request: unknown command\n");
2406                 return 0;
2407         }
2408 
2409         max_sector = floppy->sect * floppy->head;
2410 
2411         TRACK = CURRENT->sector / max_sector;
2412         sector_t = CURRENT->sector % max_sector;
2413         if ( floppy->track && TRACK >= floppy->track )
2414                 return 0;
2415         HEAD = sector_t / floppy->sect;
2416 
2417         if (((floppy->stretch & FD_SWAPSIDES) || TESTF( FD_NEED_TWADDLE)) && 
2418             sector_t < floppy->sect )
2419                 max_sector = floppy->sect;
2420 
2421         /* 2M disks have phantom sectors on the first track */
2422         if ( (floppy->rate & FD_2M ) && (!TRACK) && (!HEAD)){
2423                 max_sector = 2 * floppy->sect / 3;
2424                 if (sector_t >= max_sector){
2425                         current_count_sectors =  (floppy->sect - sector_t);
2426                         if ( current_count_sectors > CURRENT->nr_sectors )
2427                                 current_count_sectors = CURRENT->nr_sectors;
2428                         return 1;
2429                 }
2430                 SIZECODE = 2;
2431         } else
2432                 SIZECODE = FD_SIZECODE(floppy);
2433         raw_cmd.rate = floppy->rate & 3;
2434         if ((floppy->rate & FD_2M) &&
2435             (TRACK || HEAD ) &&
2436             raw_cmd.rate == 2)
2437                 raw_cmd.rate = 1;
2438 
2439         if ( SIZECODE )
2440                 SIZECODE2 = 0xff;
2441         else
2442                 SIZECODE2 = 0x80;
2443         raw_cmd.track = TRACK << STRETCH(floppy);
2444         DR_SELECT = UNIT(current_drive) + PH_HEAD(floppy,HEAD);
2445         GAP = floppy->gap;
2446         CODE2SIZE;
2447         SECT_PER_TRACK = floppy->sect << 2 >> SIZECODE;
2448         SECTOR = ((sector_t % floppy->sect) << 2 >> SIZECODE) + 1;
2449         tracksize = floppy->sect - floppy->sect % ssize;
2450         if ( tracksize < floppy->sect ){
2451                 SECT_PER_TRACK ++;
2452                 if (  tracksize <= sector_t % floppy->sect)
2453                         SECTOR--;
2454                 while ( tracksize <= sector_t % floppy->sect){
2455                         while( tracksize + ssize > floppy->sect ){
2456                                 SIZECODE--;
2457                                 ssize >>= 1;
2458                         }
2459                         SECTOR++; SECT_PER_TRACK ++;
2460                         tracksize += ssize;
2461                 }
2462                 max_sector = HEAD * floppy->sect + tracksize;
2463         } else if ( !TRACK && !HEAD && !( floppy->rate & FD_2M ) && probing)
2464                 max_sector = floppy->sect;
2465 
2466         aligned_sector_t = sector_t - ( sector_t % floppy->sect ) % ssize;
2467         max_size = CURRENT->nr_sectors;
2468         if ((raw_cmd.track == buffer_track) && (current_drive == buffer_drive) &&
2469             (sector_t >= buffer_min) && (sector_t < buffer_max)) {
2470                 /* data already in track buffer */
2471                 if (CT(COMMAND) == FD_READ) {
2472                         copy_buffer(1, max_sector, buffer_max);
2473                         return 1;
2474                 }
2475         } else if (aligned_sector_t != sector_t || CURRENT->nr_sectors < ssize){
2476                 if (CT(COMMAND) == FD_WRITE){
2477                         if(sector_t + CURRENT->nr_sectors > ssize &&
2478                            sector_t + CURRENT->nr_sectors < ssize + ssize)
2479                                 max_size = ssize + ssize;
2480                         else
2481                                 max_size = ssize;
2482                 }
2483                 raw_cmd.flags &= ~FD_RAW_WRITE;
2484                 raw_cmd.flags |= FD_RAW_READ;
2485                 COMMAND = FM_MODE(floppy,FD_READ);
2486         } else if ((unsigned long)CURRENT->buffer < MAX_DMA_ADDRESS ) {
2487                 int direct, indirect;
2488 
2489                 indirect= transfer_size(ssize,max_sector,max_buffer_sectors*2) -
2490                         sector_t;
2491 
2492                 max_size = buffer_chain_size();
2493                 if ( max_size > ( MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9)
2494                         max_size=(MAX_DMA_ADDRESS - ((unsigned long) CURRENT->buffer))>>9;
2495                 /* 64 kb boundaries */
2496                 if (CROSS_64KB(CURRENT->buffer, max_size << 9))
2497                         max_size = ( K_64 - ((long) CURRENT->buffer) % K_64)>>9;
2498                 direct = transfer_size(ssize,max_sector,max_size) - sector_t;
2499                 /*
2500                  * We try to read tracks, but if we get too many errors, we
2501                  * go back to reading just one sector at a time.
2502                  *
2503                  * This means we should be able to read a sector even if there
2504                  * are other bad sectors on this track.
2505                  */
2506                 if (!direct ||
2507                     (indirect * 2 > direct * 3 &&
2508                      *errors < DP->max_errors.read_track &&
2509                      /*!TESTF( FD_NEED_TWADDLE) &&*/
2510                      ((!probing || (DP->read_track&(1<<DRS->probed_format)))))){
2511                         max_size = CURRENT->nr_sectors;
2512                 } else {
2513                         current_addr = CURRENT->buffer;
2514                         raw_cmd.length = current_count_sectors << 9;
2515                         if (raw_cmd.length == 0){
2516                                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2517                                 DPRINT3("indirect=%d direct=%d sector_t=%d",
2518                                         indirect, direct, sector_t);
2519                                 return 0;
2520                         }
2521                         return 2;
2522                 }
2523         }
2524 
2525         if ( CT(COMMAND) == FD_READ )
2526                 max_size = max_sector; /* unbounded */
2527 
2528         /* claim buffer track if needed */
2529         if (buffer_track != raw_cmd.track ||  /* bad track */
2530             buffer_drive !=current_drive || /* bad drive */
2531             sector_t > buffer_max ||
2532             sector_t < buffer_min ||
2533             ((CT(COMMAND) == FD_READ ||
2534               (aligned_sector_t == sector_t && CURRENT->nr_sectors >= ssize ))&&
2535              max_sector > 2 * max_buffer_sectors + buffer_min &&
2536              max_size + sector_t > 2 * max_buffer_sectors + buffer_min)
2537             /* not enough space */ ){
2538                 buffer_track = -1;
2539                 buffer_drive = current_drive;
2540                 buffer_max = buffer_min = aligned_sector_t;
2541         }
2542         current_addr = floppy_track_buffer +((aligned_sector_t-buffer_min )<<9);
2543 
2544         if ( CT(COMMAND) == FD_WRITE ){
2545                 /* copy write buffer to track buffer.
2546                  * if we get here, we know that the write
2547                  * is either aligned or the data already in the buffer
2548                  * (buffer will be overwritten) */
2549 #ifdef CONFIG_FLOPPY_SANITY
2550                 if (sector_t != aligned_sector_t && buffer_track == -1 )
2551                         DPRINT("internal error offset !=0 on write\n");
2552 #endif
2553                 buffer_track = raw_cmd.track;
2554                 buffer_drive = current_drive;
2555                 copy_buffer(ssize, max_sector, 2*max_buffer_sectors+buffer_min);
2556         } else
2557                 transfer_size(ssize, max_sector,
2558                               2*max_buffer_sectors+buffer_min-aligned_sector_t);
2559 
2560         /* round up current_count_sectors to get dma xfer size */
2561         raw_cmd.length = sector_t+current_count_sectors-aligned_sector_t;
2562         raw_cmd.length = ((raw_cmd.length -1)|(ssize-1))+1;
2563         raw_cmd.length <<= 9;
2564 #ifdef CONFIG_FLOPPY_SANITY
2565         if ((raw_cmd.length < current_count_sectors << 9) ||
2566             (current_addr != CURRENT->buffer &&
2567              CT(COMMAND) == FD_WRITE &&
2568              (aligned_sector_t + (raw_cmd.length >> 9) > buffer_max ||
2569               aligned_sector_t < buffer_min )) ||
2570             raw_cmd.length % ( 128 << SIZECODE ) ||
2571             raw_cmd.length <= 0 || current_count_sectors <= 0){
2572                 DPRINT2("fractionary current count b=%lx s=%lx\n",
2573                         raw_cmd.length, current_count_sectors);
2574                 if ( current_addr != CURRENT->buffer )
2575                         printk("addr=%d, length=%ld\n",
2576                                (int) ((current_addr - floppy_track_buffer ) >> 9),
2577                                current_count_sectors);
2578                 printk("st=%d ast=%d mse=%d msi=%d\n",
2579                        sector_t, aligned_sector_t, max_sector, max_size);
2580                 printk("ssize=%x SIZECODE=%d\n", ssize, SIZECODE);
2581                 printk("command=%x SECTOR=%d HEAD=%d, TRACK=%d\n",
2582                        COMMAND, SECTOR, HEAD, TRACK);
2583                 printk("buffer drive=%d\n", buffer_drive);
2584                 printk("buffer track=%d\n", buffer_track);
2585                 printk("buffer_min=%d\n", buffer_min );
2586                 printk("buffer_max=%d\n", buffer_max );
2587                 return 0;
2588         }
2589 
2590         if (current_addr != CURRENT->buffer ){
2591                 if (current_addr < floppy_track_buffer ||
2592                     current_count_sectors < 0 ||
2593                     raw_cmd.length < 0 ||
2594                     current_addr + raw_cmd.length >
2595                     floppy_track_buffer + (max_buffer_sectors  << 10)){
2596                         DPRINT("buffer overrun in schedule dma\n");
2597                         printk("sector_t=%d buffer_min=%d current_count=%ld\n",
2598                                sector_t, buffer_min,
2599                                raw_cmd.length >> 9 );
2600                         printk("current_count_sectors=%ld\n",
2601                                current_count_sectors);
2602                         if ( CT(COMMAND) == FD_READ )
2603                                 printk("read\n");
2604                         if ( CT(COMMAND) == FD_READ )
2605                                 printk("write\n");
2606                         return 0;
2607                 }
2608         } else if (raw_cmd.length > CURRENT->nr_sectors << 9 ||
2609                    current_count_sectors > CURRENT->nr_sectors){
2610                 DPRINT("buffer overrun in direct transfer\n");
2611                 return 0;
2612         } else if ( raw_cmd.length < current_count_sectors << 9 ){
2613                 DPRINT("more sectors than bytes\n");
2614                 printk("bytes=%ld\n", raw_cmd.length >> 9 );
2615                 printk("sectors=%ld\n", current_count_sectors);
2616         }
2617         if (raw_cmd.length == 0){
2618                 DPRINT("zero dma transfer attempted from make_raw_request\n");
2619                 return 0;
2620         }
2621 #endif
2622         return 2;
2623 }
2624 
2625 static void redo_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2626 {
2627 #define REPEAT {request_done(0); continue; }
2628         kdev_t device;
2629         int tmp;
2630 #if 0
2631         kdev_t error = 0;
2632 #endif
2633 
2634         lastredo = jiffies;
2635         if (current_drive < N_DRIVE)
2636                 floppy_off(current_drive);
2637 
2638         if (CURRENT && CURRENT->rq_status == RQ_INACTIVE){
2639                 DPRINT("current not active!\n");
2640                 return;
2641         }
2642 
2643         while(1){
2644                 if (!CURRENT) {
2645                         CLEAR_INTR;
2646                         unlock_fdc();
2647                         return;
2648                 }
2649                 if (MAJOR(CURRENT->rq_dev) != MAJOR_NR)
2650                         panic(DEVICE_NAME ": request list destroyed");
2651                 if (CURRENT->bh && !CURRENT->bh->b_lock)
2652                         panic(DEVICE_NAME ": block not locked");
2653 #if 0
2654                 if (!CURRENT->bh->b_count && 
2655                     (CURRENT->errors || error == CURRENT->rq_dev)){
2656                         error = CURRENT->rq_dev;
2657                         DPRINT("skipping read ahead buffer\n");
2658                         REPEAT;
2659                 }
2660                 error = 0;
2661 #endif
2662                 device = CURRENT->rq_dev;
2663                 set_fdc( DRIVE(device));
2664                 reschedule_timeout(CURRENTD, "redo fd request", 0);
2665 
2666                 set_floppy(device);
2667                 if(start_motor(redo_fd_request)) return;
2668                 if(test_bit(current_drive, &fake_change) ||
2669                    TESTF(FD_DISK_CHANGED)){
2670                         DPRINT("disk absent or changed during operation\n");
2671                         REPEAT;
2672                 }
2673                 if (!floppy) { /* Autodetection */
2674                         if (!probing){
2675                                 DRS->probed_format = 0;
2676                                 if ( next_valid_format() ){
2677                                         DPRINT("no autodetectable formats\n");
2678                                         floppy = NULL;
2679                                         REPEAT;
2680                                 }
2681                         }
2682                         probing = 1;
2683                         floppy = floppy_type+DP->autodetect[DRS->probed_format];
2684                 } else
2685                         probing = 0;
2686                 errors = & (CURRENT->errors);
2687                 tmp = make_raw_rw_request();
2688                 if ( tmp < 2 ){
2689                         request_done(tmp);
2690                         continue;
2691                 }
2692 
2693                 if (TESTF(FD_NEED_TWADDLE))
2694                         twaddle();
2695                 floppy_tq.routine = (void *)(void *) floppy_start;
2696                 queue_task(&floppy_tq, &tq_timer);
2697 #ifdef DEBUGT
2698                 debugt("queue fd request");
2699 #endif
2700                 return;
2701         }
2702 #undef REPEAT
2703 }
2704 
2705 static struct cont_t rw_cont={
2706         rw_interrupt,
2707         redo_fd_request,
2708         bad_flp_intr,
2709         request_done };
2710 
2711 struct tq_struct request_tq = 
2712 { 0, 0, (void *) (void *) redo_fd_request, 0 };
2713 
2714 static void process_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2715 {
2716         cont = &rw_cont;
2717         queue_task(&request_tq, &tq_timer);
2718 }
2719 
2720 static void do_fd_request(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2721 {
2722         if (fdc_busy){
2723                 /* fdc busy, this new request will be treated when the
2724                    current one is done */
2725                 is_alive("do fd request, old request running");
2726                 return;
2727         }
2728         /* fdc_busy cannot be set by an interrupt or a bh */
2729         floppy_grab_irq_and_dma();
2730         fdc_busy=1;
2731         reschedule_timeout(MAXTIMEOUT, "do fd request",0);
2732         process_fd_request();
2733         is_alive("do fd request");
2734 }
2735 
2736 static struct cont_t poll_cont={
2737         success_and_wakeup,
2738         floppy_ready,
2739         generic_failure,
2740         generic_done };
2741 
2742 static int poll_drive(int interruptible, int flag)
     /* [previous][next][first][last][top][bottom][index][help] */
2743 {
2744         int ret;
2745         /* no auto-sense, just clear dcl */
2746         raw_cmd.flags= flag;
2747         raw_cmd.track=0;
2748         raw_cmd.cmd_count=0;
2749         cont = &poll_cont;
2750 #ifdef DCL_DEBUG
2751                 if (DP->flags & FD_DEBUG){
2752                         DPRINT("setting NEWCHANGE in poll_drive\n");
2753                 }
2754 #endif
2755         SETF(FD_DISK_NEWCHANGE);
2756         WAIT(floppy_ready);
2757         return ret;
2758 }
2759 
2760 /*
2761  * User triggered reset
2762  * ====================
2763  */
2764 
2765 static void reset_intr(void)
     /* [previous][next][first][last][top][bottom][index][help] */
2766 {
2767         printk("weird, reset interrupt called\n");
2768 }
2769 
2770 static struct cont_t reset_cont={
2771         reset_intr,
2772         success_and_wakeup,
2773         generic_failure,
2774         generic_done };
2775 
2776 static int user_reset_fdc(int drive, int arg, int interruptible)
     /* [previous][next][first][last][top][bottom][index][help] */
2777 {
2778         int ret;
2779 
2780         ret=0;
2781         if(arg == FD_RESET_IF_NEEDED && !FDCS->reset)
2782                 return 0;
2783         LOCK_FDC(drive,interruptible);
2784         if(arg == FD_RESET_ALWAYS)
2785                 FDCS->reset=1;
2786         if ( FDCS->reset ){
2787                 cont = &reset_cont;
2788                 reschedule_timeout(CURRENTD, "user reset fdc", 0);
2789                 WAIT(reset_fdc);
2790         }
2791         process_fd_request();
2792         return ret;
2793 }
2794 
2795 /*
2796  * Misc Ioctl's and support
2797  * ========================
2798  */
2799 static int fd_copyout(void *param, volatile void *address, int size)
     /* [previous][next][first][last][top][bottom][index][help] */
2800 {
2801         int i;
2802 
2803         i = verify_area(VERIFY_WRITE,param,size);
2804         if (i)
2805                 return i;
2806         memcpy_tofs(param,(void *) address, size);
2807         return 0;
2808 }
2809 
2810 #define COPYOUT(x) (fd_copyout( (void *)param, &(x), sizeof(x)))
2811 #define COPYIN(x) (memcpy_fromfs( &(x), (void *) param, sizeof(x)),0)
2812 
2813 static const char *drive_name(int type, int drive )
     /* [previous][next][first][last][top][bottom][index][help] */
2814 {
2815         struct floppy_struct *floppy;   
2816 
2817         if ( type )
2818                 floppy = floppy_type + type;
2819         else {
2820                 if ( UDP->native_format )
2821                         floppy = floppy_type + UDP->native_format;
2822                 else
2823                         return "(null)";
2824         }
2825         if ( floppy->name )
2826                 return floppy->name;
2827         else
2828                 return "(null)";
2829 }
2830 
2831 /* raw commands */
2832 static struct cont_t raw_cmd_cont={
2833         success_and_wakeup,
2834         failure_and_wakeup,
2835         generic_failure,
2836         generic_done };
2837 
2838 static int raw_cmd_ioctl(void *param)
     /* [previous][next][first][last][top][bottom][index][help] */
2839 {
2840         int i, drive, count, ret;
2841 
2842         if ( FDCS->rawcmd <= 1 )
2843                 FDCS->rawcmd = 1;
2844         for ( drive= 0; drive < N_DRIVE; drive++){
2845                 if ( FDC(drive) != fdc)
2846                         continue;
2847                 if ( drive == current_drive ){
2848                         if ( UDRS->fd_ref > 1 ){
2849                                 FDCS->rawcmd = 2;
2850                                 break;
2851                         }
2852                 } else if ( UDRS->fd_ref ){
2853                         FDCS->rawcmd = 2;
2854                         break;
2855                 }
2856         }
2857 
2858         if(FDCS->reset)
2859                 return -EIO;
2860 
2861         COPYIN(raw_cmd);
2862         raw_cmd.rate &= 0x03;   
2863         count = raw_cmd.length;
2864         if (raw_cmd.flags & (FD_RAW_WRITE | FD_RAW_READ)){
2865                 if(count > max_buffer_sectors * 1024 )
2866                         return -ENOMEM;
2867                 if(count == 0){
2868                         printk("attempt to do a 0 byte dma transfer\n");
2869                         return -EINVAL;
2870                 }
2871                 buffer_track = -1;
2872         }
2873         if ( raw_cmd.flags & FD_RAW_WRITE ){
2874                 i = verify_area(VERIFY_READ, raw_cmd.data, count );
2875                 if (i)
2876                         return i;
2877                 memcpy_fromfs(floppy_track_buffer, raw_cmd.data, count);
2878         }
2879 
2880         current_addr = floppy_track_buffer;
2881         cont = &raw_cmd_cont;
2882         IWAIT(floppy_start);
2883 #ifdef DCL_DEBUG
2884         if (DP->flags & FD_DEBUG){
2885                 DPRINT("calling disk change from raw_cmd ioctl\n");
2886         }
2887 #endif
2888         if( disk_change(current_drive) )
2889                 raw_cmd.flags |= FD_RAW_DISK_CHANGE;
2890         else
2891                 raw_cmd.flags &= ~FD_RAW_DISK_CHANGE;
2892         if(raw_cmd.flags & FD_RAW_NO_MOTOR_AFTER)
2893                 motor_off_callback(current_drive);      
2894 
2895         if ( !ret && !FDCS->reset ){
2896                 raw_cmd.reply_count = inr;
2897                 for( i=0; i< raw_cmd.reply_count; i++)
2898                         raw_cmd.reply[i] = reply_buffer[i];
2899                 if ( raw_cmd.flags & ( FD_RAW_READ | FD_RAW_WRITE ))
2900                         raw_cmd.length = get_dma_residue(FLOPPY_DMA);
2901         } else
2902                 ret = -EIO;
2903         DRS->track = NO_TRACK;
2904         if ( ret )
2905                 return ret;
2906 
2907         if ( raw_cmd.flags & FD_RAW_READ ){
2908                 i=fd_copyout( raw_cmd.data, floppy_track_buffer, count);
2909                 if (i)
2910                         return i;
2911         }
2912        
2913         return COPYOUT(raw_cmd);
2914 }
2915 
2916 static int invalidate_drive(kdev_t rdev)
     /* [previous][next][first][last][top][bottom][index][help] */
2917 {
2918         /* invalidate the buffer track to force a reread */
2919         set_bit( DRIVE(rdev), &fake_change);
2920         process_fd_request();
2921         check_disk_change(rdev);
2922         return 0;
2923 }
2924 
2925 static int fd_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
     /* [previous][next][first][last][top][bottom][index][help] */
2926     unsigned long param)
2927 {
2928 #define IOCTL_MODE_BIT 8
2929 #define OPEN_WRITE_BIT 16
2930 #define IOCTL_ALLOWED (filp && (filp->f_mode & IOCTL_MODE_BIT))
2931 
2932         struct floppy_struct newparams;
2933         struct format_descr tmp_format_req;
2934         int i,drive,type,cnt;
2935         kdev_t device;
2936         struct floppy_struct *this_floppy;
2937         const char *name;
2938 
2939         device = inode->i_rdev;
2940         switch (cmd) {
2941                 RO_IOCTLS(device,param);
2942         }
2943         type = TYPE(device);
2944         drive = DRIVE(device);
2945         switch (cmd) {
2946         case FDGETDRVTYP:
2947                 i=verify_area(VERIFY_WRITE,(void *) param,16);
2948                 if (i)
2949                         return i;
2950                 name = drive_name(type,drive);
2951                 for ( cnt=0; cnt<16; cnt++){
2952                         put_user(name[cnt], ((char*)param)+cnt);
2953                         if ( ! *name )
2954                                 break;
2955                 }
2956                 return 0;
2957         case FDGETMAXERRS:
2958                 return COPYOUT(UDP->max_errors);
2959         case FDGETPRM:
2960                 if (type)
2961                         this_floppy = &floppy_type[type];
2962                 else if ((this_floppy = current_type[drive]) ==
2963                          NULL)
2964                         return -ENODEV;
2965                 return COPYOUT(this_floppy[0]);
2966         case FDPOLLDRVSTAT:
2967                 LOCK_FDC(drive,1);
2968                 CALL(poll_drive(1, FD_RAW_NEED_DISK));
2969                 process_fd_request();
2970                 /* fall through */
2971         case FDGETDRVSTAT:
2972                 return COPYOUT(*UDRS);
2973         case FDGETFDCSTAT:
2974                 return COPYOUT(*UFDCS);
2975         case FDGETDRVPRM:
2976                 return COPYOUT(*UDP);
2977         case FDWERRORGET:
2978                 return COPYOUT(*UDRWE);
2979         }
2980         if (!IOCTL_ALLOWED)
2981                 return -EPERM;
2982         switch (cmd) {
2983         case FDWERRORCLR:
2984                 UDRWE->write_errors = 0;
2985                 UDRWE->first_error_sector = 0;
2986                 UDRWE->first_error_generation = 0;
2987                 UDRWE->last_error_sector = 0;
2988                 UDRWE->last_error_generation = 0;
2989                 UDRWE->badness = 0;
2990                 return 0;
2991         case FDRAWCMD:
2992                 if (type)
2993                         return -EINVAL;
2994                 LOCK_FDC(drive,1);
2995                 set_floppy(device);
2996                 CALL(i = raw_cmd_ioctl((void *) param));
2997                 process_fd_request();
2998                 return i;
2999         case FDFMTTRK:
3000                 if (UDRS->fd_ref != 1)
3001                         return -EBUSY;
3002                 COPYIN(tmp_format_req);
3003                 return do_format(device, &tmp_format_req);
3004         case FDSETMAXERRS:
3005                 return COPYIN(UDP->max_errors);
3006         case FDFMTBEG:
3007                 return 0;
3008         case FDCLRPRM:
3009                 LOCK_FDC(drive,1);
3010                 current_type[drive] = NULL;
3011                 floppy_sizes[drive] = MAX_DISK_SIZE;
3012                 UDRS->keep_data = 0;
3013                 return invalidate_drive(device);
3014         case FDFMTEND:
3015         case FDFLUSH:
3016                 LOCK_FDC(drive,1);
3017                 return invalidate_drive(device);
3018         case FDSETPRM:
3019         case FDDEFPRM:
3020                 COPYIN(newparams);
3021                 /* sanity checking for parameters.*/
3022                 if(newparams.sect <= 0 ||
3023                    newparams.head <= 0 ||
3024                    newparams.track <= 0 ||
3025                    newparams.track > UDP->tracks>> STRETCH(&newparams) ||
3026                    /* check if reserved bits are set */
3027                    (newparams.stretch & ~(FD_STRETCH | FD_SWAPSIDES)) != 0)
3028                         return -EINVAL;
3029                 if ( type){
3030                         if ( !suser() )
3031                                 return -EPERM;
3032                         LOCK_FDC(drive,1);
3033                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
3034                                 if (XTYPE(drive_state[cnt].fd_device) == type &&
3035                                     drive_state[cnt].fd_ref)
3036                                         set_bit(drive, &fake_change);
3037                         }
3038                         floppy_type[type] = newparams;
3039                         floppy_type[type].name="user format";
3040                         for (cnt = type << 2 ;
3041                              cnt < (type << 2 ) + 4 ;
3042                              cnt++)
3043                                 floppy_sizes[cnt]=
3044                                         floppy_sizes[cnt+0x80]=
3045                                                 floppy_type[type].size>>1;
3046                         process_fd_request();
3047                         for ( cnt = 0; cnt < N_DRIVE; cnt++){
3048                             if (XTYPE(drive_state[cnt].fd_device) == type &&
3049                                 drive_state[cnt].fd_ref)
3050                               check_disk_change(to_kdev_t(drive_state[cnt].fd_device));
3051                         }
3052                         return 0;
3053                 }
3054 
3055                 LOCK_FDC(drive,1);
3056                 if ( cmd != FDDEFPRM )
3057                         /* notice a disk change immediately, else
3058                          * we loose our settings immediately*/
3059                         CALL(poll_drive(1,0));
3060                 user_params[drive] = newparams;
3061                 if (buffer_drive == drive &&
3062                     buffer_max > user_params[drive].sect)
3063                         buffer_max=user_params[drive].sect;
3064                 current_type[drive] = &user_params[drive];
3065                 floppy_sizes[drive] = user_params[drive].size >> 1;
3066                 if (cmd == FDDEFPRM)
3067                         DRS->keep_data = -1;
3068                 else
3069                         DRS->keep_data = 1;
3070                 /* invalidation. Invalidate only when needed, i.e.
3071                  * when there are already sectors in the buffer cache
3072                  * whose number will change. This is useful, because
3073                  * mtools often changes the geometry of the disk after
3074                  * looking at the boot block */
3075                 if (DRS->maxblock >
3076                     user_params[drive].sect ||
3077                     DRS->maxtrack )
3078                         invalidate_drive(device);
3079                 else
3080                         process_fd_request();
3081                 return 0;
3082         case FDRESET:
3083                 return user_reset_fdc( drive, (int)param, 1);
3084         case FDMSGON:
3085                 UDP->flags |= FTD_MSG;
3086                 return 0;
3087         case FDMSGOFF:
3088                 UDP->flags &= ~FTD_MSG;
3089                 return 0;
3090         case FDSETEMSGTRESH:
3091                 UDP->max_errors.reporting =
3092                         (unsigned short) (param & 0x0f);
3093                 return 0;
3094         case FDTWADDLE:
3095                 LOCK_FDC(drive,1);
3096                 twaddle();
3097                 process_fd_request();
3098         }
3099         if ( ! suser() )
3100                 return -EPERM;
3101         switch(cmd){
3102         case FDSETDRVPRM:
3103                 return COPYIN(*UDP);
3104         default:
3105                 return -EINVAL;
3106         }
3107         return 0;
3108 #undef IOCTL_ALLOWED
3109 }
3110 
3111 static void config_types(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3112 {
3113         int first=1;
3114         int drive;
3115 
3116         /* read drive info out of physical cmos */
3117         drive=0;
3118         if (!UDP->cmos )
3119                 UDP->cmos= FLOPPY0_TYPE;
3120         drive=1;
3121         if (!UDP->cmos && FLOPPY1_TYPE)
3122                 UDP->cmos = FLOPPY1_TYPE;
3123 
3124         /* XXX */
3125         /* additional physical CMOS drive detection should go here */
3126 
3127         for (drive=0; drive < N_DRIVE; drive++){
3128                 if (UDP->cmos >= 0 && UDP->cmos <= NUMBER(default_drive_params))
3129                         memcpy((char *) UDP,
3130                                (char *) (&default_drive_params[(int)UDP->cmos].params),
3131                                sizeof(struct floppy_drive_params));
3132                 if (UDP->cmos){
3133                         if (first)
3134                                 printk("Floppy drive(s): ");
3135                         else
3136                                 printk(", ");
3137                         first=0;
3138                         if (UDP->cmos > 0 ){
3139                                 ALLOWED_DRIVE_MASK |= 1 << drive;
3140                                 printk("fd%d is %s", drive,
3141                                        default_drive_params[(int)UDP->cmos].name);
3142                         } else
3143                                 printk("fd%d is unknown type %d",drive,
3144                                        UDP->cmos);
3145                 }
3146         }
3147         if(!first)
3148                 printk("\n");
3149 }
3150 
3151 static int floppy_read(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3152                        char * buf, int count)
3153 {
3154         int drive = DRIVE(inode->i_rdev);
3155 
3156         check_disk_change(inode->i_rdev);
3157         if (UTESTF(FD_DISK_CHANGED))
3158                 return -ENXIO;
3159         return block_read(inode, filp, buf, count);
3160 }
3161 
3162 static int floppy_write(struct inode * inode, struct file * filp,
     /* [previous][next][first][last][top][bottom][index][help] */
3163                         const char * buf, int count)
3164 {
3165         int block;
3166         int ret;
3167         int drive = DRIVE(inode->i_rdev);
3168 
3169         if(!UDRS->maxblock)
3170                 UDRS->maxblock=1;/* make change detectable */
3171         check_disk_change(inode->i_rdev);
3172         if (UTESTF(FD_DISK_CHANGED)) 
3173                 return -ENXIO;
3174         if(!UTESTF(FD_DISK_WRITABLE))
3175                 return -EROFS;
3176         block = (filp->f_pos + count) >> 9;
3177         if(block > UDRS->maxblock)
3178                 UDRS->maxblock = block;
3179         ret= block_write(inode, filp, buf, count);
3180         return ret;
3181 }
3182 
3183 static void floppy_release(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3184 {
3185         int drive;
3186         
3187         drive = DRIVE(inode->i_rdev);
3188 
3189         if( !filp || (filp->f_mode & (2 | OPEN_WRITE_BIT)))
3190                 /* if the file is mounted OR (writable now AND writable at
3191                  * open time) Linus: Does this cover all cases? */
3192                 block_fsync(inode,filp);
3193                         
3194         if (UDRS->fd_ref < 0)
3195                 UDRS->fd_ref=0;
3196         else if (!UDRS->fd_ref--) {
3197                 DPRINT("floppy_release with fd_ref == 0");
3198                 UDRS->fd_ref = 0;
3199         }
3200         floppy_release_irq_and_dma();
3201 }
3202 
3203 /*
3204  * floppy_open check for aliasing (/dev/fd0 can be the same as
3205  * /dev/PS0 etc), and disallows simultaneous access to the same
3206  * drive with different device numbers.
3207  */
3208 #define RETERR(x) \
3209         do{floppy_release(inode,filp); \
3210            return -(x);}while(0)
3211 
3212 static int floppy_open(struct inode * inode, struct file * filp)
     /* [previous][next][first][last][top][bottom][index][help] */
3213 {
3214         int drive;
3215         kdev_t old_dev;
3216         int try;
3217         char *tmp;
3218 
3219         if (!filp) {
3220                 DPRINT("Weird, open called with filp=0\n");
3221                 return -EIO;
3222         }
3223 
3224         drive = DRIVE(inode->i_rdev);
3225 
3226         if (drive >= N_DRIVE || 
3227             !( ALLOWED_DRIVE_MASK & ( 1 << drive)) ||
3228             fdc_state[FDC(drive)].version == FDC_NONE)
3229                 return -ENXIO;
3230 
3231         if (TYPE(inode->i_rdev) >= NUMBER(floppy_type))
3232                 return -ENXIO;
3233         old_dev = to_kdev_t(UDRS->fd_device);
3234         if (UDRS->fd_ref && old_dev != inode->i_rdev)
3235                 return -EBUSY;
3236 
3237         if(!UDRS->fd_ref && (UDP->flags & FD_BROKEN_DCL)){
3238                 USETF(FD_DISK_CHANGED);
3239                 USETF(FD_VERIFY);
3240         }
3241 
3242         if(UDRS->fd_ref == -1 ||
3243            (UDRS->fd_ref && (filp->f_flags & O_EXCL)))
3244                 return -EBUSY;
3245 
3246         if (floppy_grab_irq_and_dma())
3247                 return -EBUSY;
3248 
3249         if (filp->f_flags & O_EXCL)
3250                 UDRS->fd_ref = -1;
3251         else
3252                 UDRS->fd_ref++;
3253 
3254         if (!floppy_track_buffer){
3255                 /* if opening an ED drive, reserve a big buffer,
3256                  * else reserve a small one */
3257                 if ((UDP->cmos == 6) || (UDP->cmos == 5))
3258                         try = 64; /* Only 48 actually useful */
3259                 else
3260                         try = 32; /* Only 24 actually useful */
3261 
3262                 tmp=(char *)dma_mem_alloc(1024 * try);
3263                 if (!tmp) {
3264                         try >>= 1; /* buffer only one side */
3265                         if (try < 16)
3266                                 try=16;
3267                         tmp= (char *)dma_mem_alloc(1024*try);
3268                 }
3269                 if (!tmp) {
3270                         DPRINT("Unable to allocate DMA memory\n");
3271                         RETERR(ENXIO);
3272                 }
3273                 if (floppy_track_buffer){
3274                         free_pages((unsigned long)tmp,__get_order(try*1024));
3275                 }else {
3276                         floppy_track_buffer = tmp;
3277                         max_buffer_sectors = try;
3278                 }
3279         }
3280 
3281         UDRS->fd_device = kdev_t_to_nr(inode->i_rdev);
3282 
3283         if (old_dev && old_dev != inode->i_rdev) {
3284                 if (buffer_drive == drive)
3285                         buffer_track = -1;
3286                 invalidate_buffers(old_dev);
3287         }
3288 
3289         /* Allow ioctls if we have write-permissions even if read-only open */
3290         if ((filp->f_mode & 2) || (permission(inode,2) == 0))
3291                 filp->f_mode |= IOCTL_MODE_BIT;
3292         if (filp->f_mode & 2)
3293                 filp->f_mode |= OPEN_WRITE_BIT;
3294 
3295         if (UFDCS->rawcmd == 1)
3296                UFDCS->rawcmd = 2;
3297 
3298         if (filp->f_flags & O_NDELAY)
3299                 return 0;
3300         if (filp->f_mode & 3) {
3301                 UDRS->last_checked = 0;
3302                 check_disk_change(inode->i_rdev);
3303                 if (UTESTF(FD_DISK_CHANGED))
3304                         RETERR(ENXIO);
3305         }
3306         if ((filp->f_mode & 2) && !(UTESTF(FD_DISK_WRITABLE)))
3307                 RETERR(EROFS);
3308         return 0;
3309 #undef RETERR
3310 }
3311 
3312 /*
3313  * Check if the disk has been changed or if a change has been faked.
3314  */
3315 static int check_floppy_change(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3316 {
3317         int drive = DRIVE( dev );
3318 
3319         if (MAJOR(dev) != MAJOR_NR) {
3320                 DPRINT("floppy_changed: not a floppy\n");
3321                 return 0;
3322         }
3323 
3324         if (UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY))
3325                 return 1;
3326 
3327         if(UDRS->last_checked + UDP->checkfreq < jiffies){
3328                 lock_fdc(drive,0);
3329                 poll_drive(0,0);
3330                 process_fd_request();
3331         }
3332 
3333         if(UTESTF(FD_DISK_CHANGED) ||
3334            UTESTF(FD_VERIFY) ||
3335            test_bit(drive, &fake_change) ||
3336            (!TYPE(dev) && !current_type[drive]))
3337                 return 1;
3338         return 0;
3339 }
3340 
3341 /* revalidate the floppy disk, i.e. trigger format autodetection by reading
3342  * the bootblock (block 0). "Autodetection" is also needed to check whether
3343  * there is a disk in the drive at all... Thus we also do it for fixed
3344  * geometry formats */
3345 static int floppy_revalidate(kdev_t dev)
     /* [previous][next][first][last][top][bottom][index][help] */
3346 {
3347 #define NO_GEOM (!current_type[drive] && !TYPE(dev))
3348         struct buffer_head * bh;
3349         int drive=DRIVE(dev);
3350         int cf;
3351 
3352         if(UTESTF(FD_DISK_CHANGED) || 
3353            UTESTF(FD_VERIFY) ||
3354            test_bit(drive, &fake_change) || 
3355            NO_GEOM){
3356                 lock_fdc(drive,0);
3357                 cf = UTESTF(FD_DISK_CHANGED) || UTESTF(FD_VERIFY);
3358                 if(! (cf || test_bit(drive, &fake_change) || NO_GEOM)){
3359                         process_fd_request(); /*already done by another thread*/
3360                         return 0;
3361                 }
3362                 UDRS->maxblock = 0;
3363                 UDRS->maxtrack = 0;
3364                 if ( buffer_drive == drive)
3365                         buffer_track = -1;
3366                 clear_bit(drive, &fake_change);
3367                 UCLEARF(FD_DISK_CHANGED);
3368                 if(cf)
3369                         UDRS->generation++;
3370                 if(NO_GEOM){
3371                         /* auto-sensing */
3372                         int size = floppy_blocksizes[MINOR(dev)];
3373                         if (!size)
3374                                 size = 1024;
3375                         if (!(bh = getblk(dev,0,size))){
3376                                 process_fd_request();
3377                                 return 1;
3378                         }
3379                         if ( bh && ! bh->b_uptodate)
3380                                 ll_rw_block(READ, 1, &bh);
3381                         process_fd_request();
3382                         wait_on_buffer(bh);
3383                         brelse(bh);
3384                         return 0;
3385                 } 
3386                 if(cf)
3387                                 poll_drive(0, FD_RAW_NEED_DISK);
3388                 process_fd_request();
3389         }
3390         return 0;
3391 }
3392 
3393 static struct file_operations floppy_fops = {
3394         NULL,                   /* lseek - default */
3395         floppy_read,            /* read - general block-dev read */
3396         floppy_write,           /* write - general block-dev write */
3397         NULL,                   /* readdir - bad */
3398         NULL,                   /* select */
3399         fd_ioctl,               /* ioctl */
3400         NULL,                   /* mmap */
3401         floppy_open,            /* open */
3402         floppy_release,         /* release */
3403         block_fsync,            /* fsync */
3404         NULL,                   /* fasync */
3405         check_floppy_change,    /* media_change */
3406         floppy_revalidate,      /* revalidate */
3407 };
3408 
3409 /*
3410  * Floppy Driver initialisation
3411  * =============================
3412  */
3413 
3414 /* Determine the floppy disk controller type */
3415 /* This routine was written by David C. Niemi */
3416 static char get_fdc_version(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3417 {
3418         int r;
3419 
3420         output_byte(FD_DUMPREGS);       /* 82072 and better know DUMPREGS */
3421         if ( FDCS->reset )
3422                 return FDC_NONE;
3423         if ( (r = result()) <= 0x00)
3424                 return FDC_NONE;        /* No FDC present ??? */
3425         if ((r==1) && (reply_buffer[0] == 0x80)){
3426                 printk("FDC %d is a 8272A\n",fdc);
3427                 return FDC_8272A;               /* 8272a/765 don't know DUMPREGS */
3428         }
3429         if (r != 10) {
3430                 printk("FDC init: DUMPREGS: unexpected return of %d bytes.\n", r);
3431                 return FDC_UNKNOWN;
3432         }
3433         output_byte(FD_VERSION);
3434         r = result();
3435         if ((r == 1) && (reply_buffer[0] == 0x80)){
3436                 printk("FDC %d is a 82072\n",fdc);
3437                 return FDC_82072;               /* 82072 doesn't know VERSION */
3438         }
3439         if ((r != 1) || (reply_buffer[0] != 0x90)) {
3440                 printk("FDC init: VERSION: unexpected return of %d bytes.\n", r);
3441                 return FDC_UNKNOWN;
3442         }
3443         output_byte(FD_UNLOCK);
3444         r = result();
3445         if ((r == 1) && (reply_buffer[0] == 0x80)){
3446                 printk("FDC %d is a pre-1991 82077\n", fdc);
3447                 return FDC_82077_ORIG;  /* Pre-1991 82077 doesn't know LOCK/UNLOCK */
3448         }
3449         if ((r != 1) || (reply_buffer[0] != 0x00)) {
3450                 printk("FDC init: UNLOCK: unexpected return of %d bytes.\n", r);
3451                 return FDC_UNKNOWN;
3452         }
3453         printk("FDC %d is a post-1991 82077\n",fdc);
3454         return FDC_82077;       /* Revised 82077AA passes all the tests */
3455 } /* get_fdc_version */
3456 
3457 /* lilo configuration */
3458 
3459 /* we make the invert_dcl function global. One day, somebody might
3460 want to centralize all thinkpad related options into one lilo option,
3461 there are just so many thinkpad related quirks! */
3462 void floppy_invert_dcl(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3463 {
3464         int i;
3465         
3466         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3467                 if (param)
3468                         default_drive_params[i].params.flags |= 0x80;
3469                 else
3470                         default_drive_params[i].params.flags &= ~0x80;
3471         }
3472         DPRINT("Configuring drives for inverted dcl\n");
3473 }
3474 
3475 static void daring(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3476 {
3477         int i;
3478 
3479         for (i=0; i < ARRAY_SIZE(default_drive_params); i++){
3480                 if (param){
3481                         default_drive_params[i].params.select_delay = 0;
3482                         default_drive_params[i].params.flags |= FD_SILENT_DCL_CLEAR;
3483                 } else {
3484                         default_drive_params[i].params.select_delay = 2*HZ/100;
3485                         default_drive_params[i].params.flags &= ~FD_SILENT_DCL_CLEAR;
3486                 }
3487         }
3488         DPRINT1("Assuming %s floppy hardware\n", param ? "standard" : "broken");
3489 }
3490 
3491 static void allow_drives(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3492 {
3493         ALLOWED_DRIVE_MASK=param;
3494         DPRINT1("setting allowed_drive_mask to 0x%x\n", param);
3495 }
3496 
3497 static void fdc2_adr(int *ints, int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3498 {
3499         FDC2 = param;
3500         if(param)
3501                 DPRINT1("enabling second fdc at address 0x%3x\n", FDC2);
3502         else
3503                 DPRINT("disabling second fdc\n");
3504 }
3505 
3506 static void unex(int *ints,int param)
     /* [previous][next][first][last][top][bottom][index][help] */
3507 {
3508         print_unex = param;
3509         DPRINT1("%sprinting messages for unexpected interrupts\n",
3510                 param ? "" : "not ");
3511 }
3512 
3513 static void set_cmos(int *ints, int dummy)
     /* [previous][next][first][last][top][bottom][index][help] */
3514 {
3515         int current_drive=0;
3516 
3517         if ( ints[0] != 2 ){
3518                 DPRINT("wrong number of parameter for cmos\n");
3519                 return;
3520         }
3521         current_drive = ints[1];
3522         if (current_drive < 0 || current_drive >= 8 ){
3523                 DPRINT("bad drive for set_cmos\n");
3524                 return;
3525         }
3526         if(ints[2] <= 0 || ints[2] >= NUMBER(default_drive_params)){
3527                 DPRINT1("bad cmos code %d\n", ints[2]);
3528                 return;
3529         }
3530         DP->cmos = ints[2];
3531         DPRINT1("setting cmos code to %d\n", ints[2]);
3532 }
3533                 
3534 static struct param_table {
3535         const char *name;
3536         void (*fn)(int *ints, int param);
3537         int def_param;
3538 } config_params[]={
3539 { "allowed_drive_mask", allow_drives, 0xff },
3540 { "all_drives", allow_drives, 0xff },
3541 { "asus_pci", allow_drives, 0x33 },
3542 
3543 { "daring", daring, 1},
3544 
3545 { "two_fdc", fdc2_adr, 0x370 },
3546 { "one_fdc", fdc2_adr, 0 },
3547 
3548 { "thinkpad", floppy_invert_dcl, 1 },
3549 
3550 { "cmos", set_cmos, 0 },
3551 
3552 { "unexpected_interrupts", unex, 1 },
3553 { "no_unexpected_interrupts", unex, 0 },
3554 { "L40SX", unex, 0 } };
3555 
3556 #define FLOPPY_SETUP
3557 void floppy_setup(char *str, int *ints)
     /* [previous][next][first][last][top][bottom][index][help] */
3558 {
3559         int i;
3560         int param;
3561         if(!str)
3562                 return;
3563         for(i=0; i< ARRAY_SIZE(config_params); i++){
3564                 if (strcmp(str,config_params[i].name) == 0 ){
3565                         if (ints[0] )
3566                                 param = ints[1];
3567                         else
3568                                 param = config_params[i].def_param;
3569                         config_params[i].fn(ints,param);
3570                         return;
3571                 }
3572         }
3573         DPRINT1("unknown floppy option [%s]\n", str);
3574         DPRINT("allowed options are:");
3575         for(i=0; i< ARRAY_SIZE(config_params); i++)
3576                 printk(" %s",config_params[i].name);
3577         printk("\n");
3578         DPRINT("Read linux/drivers/block/README.fd\n");
3579 }
3580 
3581 int floppy_init(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3582 {
3583         int i,drive;
3584         int have_no_fdc=0;
3585 
3586         sti();
3587 
3588         if (register_blkdev(MAJOR_NR,"fd",&floppy_fops)) {
3589                 printk("Unable to get major %d for floppy\n",MAJOR_NR);
3590                 return -EBUSY;
3591         }
3592 
3593         for(i=0; i<256; i++)
3594                 if ( ITYPE(i))
3595                         floppy_sizes[i] = floppy_type[ITYPE(i)].size >> 1;
3596                 else
3597                         floppy_sizes[i] = MAX_DISK_SIZE;
3598 
3599         blk_size[MAJOR_NR] = floppy_sizes;
3600         blksize_size[MAJOR_NR] = floppy_blocksizes;
3601         blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
3602         reschedule_timeout(MAXTIMEOUT, "floppy init", MAXTIMEOUT);
3603         config_types();
3604 
3605         fdc_state[0].address = FDC1;
3606         fdc_state[0].dor = 0;
3607 #if N_FDC > 1
3608         fdc_state[1].address = FDC2;
3609         fdc_state[1].dor = 0;
3610 #endif
3611 
3612         for (i = 0 ; i < N_FDC ; i++) {
3613                 fdc = i;
3614                 FDCS->dtr = -1;
3615                 FDCS->dor = 0x4;
3616                 FDCS->reset = 0;
3617                 FDCS->version = FDC_NONE;
3618         }
3619 
3620         if(floppy_grab_irq_and_dma()){
3621                 unregister_blkdev(MAJOR_NR,"fd");
3622                 return -EBUSY;
3623         }
3624 
3625         /* initialise drive state */
3626         for (drive = 0; drive < N_DRIVE ; drive++) {
3627                 UDRS->flags = FD_VERIFY | FD_DISK_NEWCHANGE | FD_DISK_CHANGED;
3628                 UDRS->generation = 0;
3629                 UDRS->keep_data = 0;
3630                 UDRS->fd_ref = 0;
3631                 UDRS->fd_device = 0;
3632                 floppy_track_buffer = NULL;
3633                 max_buffer_sectors = 0;
3634                 UDRWE->write_errors = 0;
3635                 UDRWE->first_error_sector = 0;
3636                 UDRWE->first_error_generation = 0;
3637                 UDRWE->last_error_sector = 0;
3638                 UDRWE->last_error_generation = 0;
3639                 UDRWE->badness = 0;
3640         }
3641 
3642         for (i = 0 ; i < N_FDC ; i++) {
3643                 fdc = i;
3644                 if (FDCS->address == -1 )
3645                         continue;
3646                 FDCS->rawcmd = 2;
3647                 if(user_reset_fdc(-1,FD_RESET_IF_NEEDED,0)){
3648                         FDCS->address = -1;
3649                         continue;
3650                 }
3651                 /* Try to determine the floppy controller type */
3652                 FDCS->version = get_fdc_version();
3653                 if (FDCS->version == FDC_NONE){
3654                         FDCS->address = -1;
3655                         continue;
3656                 }
3657                 
3658                 request_region(FDCS->address, 6, "floppy");
3659                 request_region(FDCS->address+7, 1, "floppy DIR");
3660                 /* address + 6 is reserved, and may be taken by IDE.
3661                  * Unfortunately, Adaptec doesn't know this :-(, */
3662 
3663                 have_no_fdc = 0;
3664                 /* Not all FDCs seem to be able to handle the version command
3665                  * properly, so force a reset for the standard FDC clones,
3666                  * to avoid interrupt garbage.
3667                  */
3668                 FDCS->has_fifo = FDCS->version >= FDC_82077_ORIG;
3669                 user_reset_fdc(-1,FD_RESET_ALWAYS,0);
3670         }
3671         fdc=0;
3672         del_timer(&fd_timeout);
3673         current_drive = 0;
3674         floppy_release_irq_and_dma();
3675         initialising=0;
3676         if(have_no_fdc)
3677                 unregister_blkdev(MAJOR_NR,"fd");
3678         return have_no_fdc;
3679 }
3680 
3681 static int floppy_grab_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3682 {
3683         int i;
3684         cli();
3685         if (usage_count++){
3686                 sti();
3687                 return 0;
3688         }
3689         sti();
3690 #ifdef FD_MODULE
3691         MOD_INC_USE_COUNT;
3692 #endif
3693         for(i=0; i< N_FDC; i++){
3694                 if(FDCS->address != -1){        
3695                         fdc = i;
3696                         reset_fdc_info(1);
3697                         outb_p(FDCS->dor, FD_DOR);
3698                 }
3699         }
3700         set_dor(0, ~0, 8);  /* avoid immediate interrupt */
3701 
3702         if (request_irq(FLOPPY_IRQ, floppy_interrupt,
3703                         SA_INTERRUPT|SA_SAMPLE_RANDOM, "floppy")) {
3704                 DPRINT1("Unable to grab IRQ%d for the floppy driver\n",
3705                         FLOPPY_IRQ);
3706                 return -1;
3707         }
3708         if (request_dma(FLOPPY_DMA,"floppy")) {
3709                 DPRINT1("Unable to grab DMA%d for the floppy driver\n",
3710                         FLOPPY_DMA);
3711                 free_irq(FLOPPY_IRQ);
3712                 return -1;
3713         }
3714         for(fdc = 0; fdc < N_FDC ; fdc++)
3715                 if(FDCS->address != -1)
3716                         outb_p(FDCS->dor, FD_DOR);
3717         fdc = 0;
3718         enable_irq(FLOPPY_IRQ);
3719         return 0;
3720 }
3721 
3722 static void floppy_release_irq_and_dma(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3723 {
3724 #ifdef CONFIG_FLOPPY_SANITY
3725         int drive;
3726 #endif
3727         long tmpsize;
3728         void *tmpaddr;
3729 
3730         cli();
3731         if (--usage_count){
3732                 sti();
3733                 return;
3734         }
3735         sti();
3736 #ifdef FD_MODULE
3737         MOD_DEC_USE_COUNT;
3738 #endif
3739         disable_dma(FLOPPY_DMA);
3740         free_dma(FLOPPY_DMA);
3741         disable_irq(FLOPPY_IRQ);
3742         free_irq(FLOPPY_IRQ);
3743 
3744         set_dor(0, ~0, 8);
3745 #if N_FDC > 1
3746         set_dor(1, ~8, 0);
3747 #endif
3748         floppy_enable_hlt();
3749 
3750         if (floppy_track_buffer && max_buffer_sectors) {
3751                 tmpsize = max_buffer_sectors*1024;
3752                 tmpaddr = (void *)floppy_track_buffer;
3753                 floppy_track_buffer = 0;
3754                 max_buffer_sectors = 0;
3755                 free_pages((unsigned long)tmpaddr, __get_order(tmpsize));
3756         }
3757 
3758 #ifdef CONFIG_FLOPPY_SANITY
3759         for(drive=0; drive < N_FDC * 4; drive++)
3760                 if( motor_off_timer[drive].next )
3761                         printk("motor off timer %d still active\n", drive);
3762         
3763         if(fd_timeout.next)
3764                 printk("floppy timer still active:%s\n", timeout_message);
3765         if (fd_timer.next)
3766                 printk("auxiliary floppy timer still active\n");
3767         if(floppy_tq.sync)
3768                 printk("task queue still active\n");
3769 #endif
3770 }
3771 
3772 
3773 #ifdef MODULE
3774 
3775 extern char *get_options(char *str, int *ints);
3776 
3777 static void mod_setup(char *pattern, void (*setup)(char *, int *))
     /* [previous][next][first][last][top][bottom][index][help] */
3778 {
3779         int i;
3780         char c;
3781         int j;
3782         int match;
3783         char buffer[100];
3784         int ints[11];
3785         int length = strlen(pattern)+1;
3786 
3787         match=0;
3788         j=1;
3789 
3790         for(i=current->mm->env_start; 
3791             i< current->mm->env_end; 
3792             i ++){
3793                 c= get_fs_byte(i);
3794                 if(match){
3795                         if(j==99)
3796                                 c='\0';
3797                         buffer[j] = c;
3798                         if(!c || c == ' ' || c == '\t'){
3799                                 if(j){
3800                                         buffer[j] = '\0';
3801                                         setup(get_options(buffer,ints),ints);
3802                                 }
3803                                 j=0;
3804                         } else
3805                                 j++;
3806                         if(!c)
3807                                 break;
3808                         continue;
3809                 }
3810                 if( (!j && !c) ||
3811                    ( j && c == pattern[j-1]))
3812                         j++;
3813                 else
3814                         j=0;
3815                 if(j==length){
3816                         match=1;
3817                         j=0;
3818                 }
3819         }
3820 }
3821 
3822 
3823 #ifdef __cplusplus
3824 extern "C" {
3825 #endif
3826 int init_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3827 {
3828         int ret;
3829         printk("inserting floppy driver for %s\n", kernel_version);
3830 
3831         mod_setup("floppy=", floppy_setup);
3832 
3833         ret = floppy_init();
3834         return 0;
3835 }
3836 
3837 void cleanup_module(void)
     /* [previous][next][first][last][top][bottom][index][help] */
3838 {
3839         int fdc;
3840 
3841         for(fdc=0; fdc<2; fdc++)
3842                 if (FDCS->address != -1){
3843                         release_region(FDCS->address, 6);
3844                         release_region(FDCS->address+7, 1);
3845                       }
3846 
3847         unregister_blkdev(MAJOR_NR, "fd");
3848 
3849         blk_dev[MAJOR_NR].request_fn = 0;
3850 }
3851 
3852 #ifdef __cplusplus
3853 }
3854 #endif
3855 
3856 #endif
/* [previous][next][first][last][top][bottom][index][help] */