sys/dev/disk/fd/fd.c

   1 /*
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Don Ahn.
   7  *
   8  * Libretto PCMCIA floppy support by David Horwitt (dhorwitt@ucsd.edu)
   9  * aided by the Linux floppy driver modifications from David Bateman
  10  * (dbateman@eng.uts.edu.au).
  11  *
  12  * Copyright (c) 1993, 1994 by
  13  *  jc@irbs.UUCP (John Capo)
  14  *  vak@zebub.msk.su (Serge Vakulenko)
  15  *  ache@astral.msk.su (Andrew A. Chernov)
  16  *
  17  * Copyright (c) 1993, 1994, 1995 by
  18  *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
  19  *  dufault@hda.com (Peter Dufault)
  20  *
  21  * Copyright (c) 2001 Joerg Wunsch,
  22  *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  * 3. All advertising materials mentioning features or use of this software
  33  *    must display the following acknowledgement:
  34  *      This product includes software developed by the University of
  35  *      California, Berkeley and its contributors.
  36  * 4. Neither the name of the University nor the names of its contributors
  37  *    may be used to endorse or promote products derived from this software
  38  *    without specific prior written permission.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  *      from:   @(#)fd.c        7.4 (Berkeley) 5/25/91
  53  * $FreeBSD: src/sys/isa/fd.c,v 1.176.2.8 2002/05/15 21:56:14 joerg Exp $
  54  * $DragonFly: src/sys/dev/disk/fd/fd.c,v 1.20 2004/11/12 09:50:38 joerg Exp $
  55  *
  56  */
  57
  58 #include "opt_fdc.h"
  59 #include "use_pccard.h"
  60
  61 #include <sys/param.h>
  62 #include <sys/systm.h>
  63 #include <sys/bootmaj.h>
  64 #include <sys/kernel.h>
  65 #include <sys/buf.h>
  66 #include <sys/bus.h>
  67 #include <sys/conf.h>
  68 #include <sys/disklabel.h>
  69 #include <sys/devicestat.h>
  70 #include <sys/fcntl.h>
  71 #include <sys/malloc.h>
  72 #include <sys/module.h>
  73 #include <sys/proc.h>
  74 #include <sys/syslog.h>
  75 #include <sys/device.h>
  76
  77 #include <sys/bus.h>
  78 #include <machine/bus.h>
  79 #include <sys/rman.h>
  80
  81 #include <sys/buf2.h>
  82
  83 #include <machine/clock.h>
  84 #include <machine/ioctl_fd.h>
  85 #include <machine/resource.h>
  86 #include <machine/stdarg.h>
  87
  88 #include <bus/isa/isavar.h>
  89 #include <bus/isa/isareg.h>
  90 #include "fdreg.h"
  91 #include "fdc.h"
  92 #include <bus/isa/rtc.h>
  93
  94 /* misuse a flag to identify format operation */
  95 #define B_FORMAT B_XXX
  96
  97 /* configuration flags */
  98 #define FDC_PRETEND_D0  (1 << 0)        /* pretend drive 0 to be there */
  99 #define FDC_NO_FIFO     (1 << 2)        /* do not enable FIFO  */
 100
 101 /* internally used only, not really from CMOS: */
 102 #define RTCFDT_144M_PRETENDED   0x1000
 103
 104 /* error returns for fd_cmd() */
 105 #define FD_FAILED -1
 106 #define FD_NOT_VALID -2
 107 #define FDC_ERRMAX      100     /* do not log more */
 108 /*
 109  * Stop retrying after this many DMA overruns.  Since each retry takes
 110  * one revolution, with 300 rpm., 25 retries take approximately 10
 111  * seconds which the read attempt will block in case the DMA overrun
 112  * is persistent.
 113  */
 114 #define FDC_DMAOV_MAX   25
 115
 116 /*
 117  * Timeout value for the PIO loops to wait until the FDC main status
 118  * register matches our expectations (request for master, direction
 119  * bit).  This is supposed to be a number of microseconds, although
 120  * timing might actually not be very accurate.
 121  *
 122  * Timeouts of 100 msec are believed to be required for some broken
 123  * (old) hardware.
 124  */
 125 #define FDSTS_TIMEOUT   100000
 126
 127 #define NUMTYPES 17
 128 #define NUMDENS  (NUMTYPES - 7)
 129
 130 /* These defines (-1) must match index for fd_types */
 131 #define F_TAPE_TYPE     0x020   /* bit for fd_types to indicate tape */
 132 #define NO_TYPE         0       /* must match NO_TYPE in ft.c */
 133 #define FD_1720         1
 134 #define FD_1480         2
 135 #define FD_1440         3
 136 #define FD_1200         4
 137 #define FD_820          5
 138 #define FD_800          6
 139 #define FD_720          7
 140 #define FD_360          8
 141 #define FD_640          9
 142 #define FD_1232         10
 143
 144 #define FD_1480in5_25   11
 145 #define FD_1440in5_25   12
 146 #define FD_820in5_25    13
 147 #define FD_800in5_25    14
 148 #define FD_720in5_25    15
 149 #define FD_360in5_25    16
 150 #define FD_640in5_25    17
 151
 152
 153 static struct fd_type fd_types[NUMTYPES] =
 154 {
 155 { 21,2,0xFF,0x04,82,3444,1,FDC_500KBPS,2,0x0C,2 }, /* 1.72M in HD 3.5in */
 156 { 18,2,0xFF,0x1B,82,2952,1,FDC_500KBPS,2,0x6C,1 }, /* 1.48M in HD 3.5in */
 157 { 18,2,0xFF,0x1B,80,2880,1,FDC_500KBPS,2,0x6C,1 }, /* 1.44M in HD 3.5in */
 158 { 15,2,0xFF,0x1B,80,2400,1,FDC_500KBPS,2,0x54,1 }, /*  1.2M in HD 5.25/3.5 */
 159 { 10,2,0xFF,0x10,82,1640,1,FDC_250KBPS,2,0x2E,1 }, /*  820K in HD 3.5in */
 160 { 10,2,0xFF,0x10,80,1600,1,FDC_250KBPS,2,0x2E,1 }, /*  800K in HD 3.5in */
 161 {  9,2,0xFF,0x20,80,1440,1,FDC_250KBPS,2,0x50,1 }, /*  720K in HD 3.5in */
 162 {  9,2,0xFF,0x2A,40, 720,1,FDC_250KBPS,2,0x50,1 }, /*  360K in DD 5.25in */
 163 {  8,2,0xFF,0x2A,80,1280,1,FDC_250KBPS,2,0x50,1 }, /*  640K in DD 5.25in */
 164 {  8,3,0xFF,0x35,77,1232,1,FDC_500KBPS,2,0x74,1 }, /* 1.23M in HD 5.25in */
 165
 166 { 18,2,0xFF,0x02,82,2952,1,FDC_500KBPS,2,0x02,2 }, /* 1.48M in HD 5.25in */
 167 { 18,2,0xFF,0x02,80,2880,1,FDC_500KBPS,2,0x02,2 }, /* 1.44M in HD 5.25in */
 168 { 10,2,0xFF,0x10,82,1640,1,FDC_300KBPS,2,0x2E,1 }, /*  820K in HD 5.25in */
 169 { 10,2,0xFF,0x10,80,1600,1,FDC_300KBPS,2,0x2E,1 }, /*  800K in HD 5.25in */
 170 {  9,2,0xFF,0x20,80,1440,1,FDC_300KBPS,2,0x50,1 }, /*  720K in HD 5.25in */
 171 {  9,2,0xFF,0x23,40, 720,2,FDC_300KBPS,2,0x50,1 }, /*  360K in HD 5.25in */
 172 {  8,2,0xFF,0x2A,80,1280,1,FDC_300KBPS,2,0x50,1 }, /*  640K in HD 5.25in */
 173 };
 174
 175 #define DRVS_PER_CTLR 2         /* 2 floppies */
 176
 177 /***********************************************************************\
 178 * Per controller structure.                                             *
 179 \***********************************************************************/
 180 devclass_t fdc_devclass;
 181
 182 /***********************************************************************\
 183 * Per drive structure.                                                  *
 184 * N per controller  (DRVS_PER_CTLR)                                     *
 185 \***********************************************************************/
 186 struct fd_data {
 187         struct  fdc_data *fdc;  /* pointer to controller structure */
 188         int     fdsu;           /* this units number on this controller */
 189         int     type;           /* Drive type (FD_1440...) */
 190         struct  fd_type *ft;    /* pointer to the type descriptor */
 191         int     flags;
 192 #define FD_OPEN         0x01    /* it's open            */
 193 #define FD_ACTIVE       0x02    /* it's active          */
 194 #define FD_MOTOR        0x04    /* motor should be on   */
 195 #define FD_MOTOR_WAIT   0x08    /* motor coming up      */
 196         int     skip;
 197         int     hddrv;
 198 #define FD_NO_TRACK -2
 199         int     track;          /* where we think the head is */
 200         int     options;        /* user configurable options, see ioctl_fd.h */
 201         struct  callout toffhandle;
 202         struct  callout tohandle;
 203         struct  callout motor;
 204         struct  devstat device_stats;
 205         device_t dev;
 206         fdu_t   fdu;
 207 };
 208
 209 struct fdc_ivars {
 210         int     fdunit;
 211 };
 212 static devclass_t fd_devclass;
 213
 214 /***********************************************************************\
 215 * Throughout this file the following conventions will be used:          *
 216 * fd is a pointer to the fd_data struct for the drive in question       *
 217 * fdc is a pointer to the fdc_data struct for the controller            *
 218 * fdu is the floppy drive unit number                                   *
 219 * fdcu is the floppy controller unit number                             *
 220 * fdsu is the floppy drive unit number on that controller. (sub-unit)   *
 221 \***********************************************************************/
 222
 223 /* internal functions */
 224 static  void fdc_intr(void *);
 225 static void set_motor(struct fdc_data *, int, int);
 226 #  define TURNON 1
 227 #  define TURNOFF 0
 228 static timeout_t fd_turnoff;
 229 static timeout_t fd_motor_on;
 230 static void fd_turnon(struct fd_data *);
 231 static void fdc_reset(fdc_p);
 232 static int fd_in(struct fdc_data *, int *);
 233 static int out_fdc(struct fdc_data *, int);
 234 static void fdstart(struct fdc_data *);
 235 static timeout_t fd_iotimeout;
 236 static timeout_t fd_pseudointr;
 237 static int fdstate(struct fdc_data *);
 238 static int retrier(struct fdc_data *);
 239 static int fdformat(dev_t, struct fd_formb *, struct thread *);
 240
 241 static int enable_fifo(fdc_p fdc);
 242
 243 static int fifo_threshold = 8;  /* XXX: should be accessible via sysctl */
 244
 245
 246 #define DEVIDLE         0
 247 #define FINDWORK        1
 248 #define DOSEEK          2
 249 #define SEEKCOMPLETE    3
 250 #define IOCOMPLETE      4
 251 #define RECALCOMPLETE   5
 252 #define STARTRECAL      6
 253 #define RESETCTLR       7
 254 #define SEEKWAIT        8
 255 #define RECALWAIT       9
 256 #define MOTORWAIT       10
 257 #define IOTIMEDOUT      11
 258 #define RESETCOMPLETE   12
 259 #define PIOREAD         13
 260
 261 #ifdef  FDC_DEBUG
 262 static char const * const fdstates[] =
 263 {
 264 "DEVIDLE",
 265 "FINDWORK",
 266 "DOSEEK",
 267 "SEEKCOMPLETE",
 268 "IOCOMPLETE",
 269 "RECALCOMPLETE",
 270 "STARTRECAL",
 271 "RESETCTLR",
 272 "SEEKWAIT",
 273 "RECALWAIT",
 274 "MOTORWAIT",
 275 "IOTIMEDOUT",
 276 "RESETCOMPLETE",
 277 "PIOREAD",
 278 };
 279
 280 /* CAUTION: fd_debug causes huge amounts of logging output */
 281 static int volatile fd_debug = 0;
 282 #define TRACE0(arg) if(fd_debug) printf(arg)
 283 #define TRACE1(arg1, arg2) if(fd_debug) printf(arg1, arg2)
 284 #else /* FDC_DEBUG */
 285 #define TRACE0(arg)
 286 #define TRACE1(arg1, arg2)
 287 #endif /* FDC_DEBUG */
 288
 289 void
 290 fdout_wr(fdc_p fdc, u_int8_t v)
 291 {
 292         bus_space_write_1(fdc->portt, fdc->porth, FDOUT+fdc->port_off, v);
 293 }
 294
 295 static u_int8_t
 296 fdsts_rd(fdc_p fdc)
 297 {
 298         return bus_space_read_1(fdc->portt, fdc->porth, FDSTS+fdc->port_off);
 299 }
 300
 301 static void
 302 fddata_wr(fdc_p fdc, u_int8_t v)
 303 {
 304         bus_space_write_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off, v);
 305 }
 306
 307 static u_int8_t
 308 fddata_rd(fdc_p fdc)
 309 {
 310         return bus_space_read_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off);
 311 }
 312
 313 static void
 314 fdctl_wr_isa(fdc_p fdc, u_int8_t v)
 315 {
 316         bus_space_write_1(fdc->ctlt, fdc->ctlh, 0, v);
 317 }
 318
 319 #if 0
 320
 321 static u_int8_t
 322 fdin_rd(fdc_p fdc)
 323 {
 324         return bus_space_read_1(fdc->portt, fdc->porth, FDIN);
 325 }
 326
 327 #endif
 328
 329 static  d_open_t        Fdopen; /* NOTE, not fdopen */
 330 static  d_close_t       fdclose;
 331 static  d_ioctl_t       fdioctl;
 332 static  d_strategy_t    fdstrategy;
 333
 334 static struct cdevsw fd_cdevsw = {
 335         /* name */      "fd",
 336         /* maj */       FD_CDEV_MAJOR,
 337         /* flags */     D_DISK,
 338         /* port */      NULL,
 339         /* clone */     NULL,
 340
 341         /* open */      Fdopen,
 342         /* close */     fdclose,
 343         /* read */      physread,
 344         /* write */     physwrite,
 345         /* ioctl */     fdioctl,
 346         /* poll */      nopoll,
 347         /* mmap */      nommap,
 348         /* strategy */  fdstrategy,
 349         /* dump */      nodump,
 350         /* psize */     nopsize
 351 };
 352
 353 static int
 354 fdc_err(struct fdc_data *fdc, const char *s)
 355 {
 356         fdc->fdc_errs++;
 357         if (s) {
 358                 if (fdc->fdc_errs < FDC_ERRMAX)
 359                         device_printf(fdc->fdc_dev, "%s", s);
 360                 else if (fdc->fdc_errs == FDC_ERRMAX)
 361                         device_printf(fdc->fdc_dev, "too many errors, not "
 362                                                     "logging any more\n");
 363         }
 364
 365         return FD_FAILED;
 366 }
 367
 368 /*
 369  * fd_cmd: Send a command to the chip.  Takes a varargs with this structure:
 370  * Unit number,
 371  * # of output bytes, output bytes as ints ...,
 372  * # of input bytes, input bytes as ints ...
 373  */
 374 int
 375 fd_cmd(struct fdc_data *fdc, int n_out, ...)
 376 {
 377         u_char cmd;
 378         int n_in;
 379         int n;
 380         __va_list ap;
 381
 382         __va_start(ap, n_out);
 383         cmd = (u_char)(__va_arg(ap, int));
 384         __va_end(ap);
 385         __va_start(ap, n_out);
 386         for (n = 0; n < n_out; n++)
 387         {
 388                 if (out_fdc(fdc, __va_arg(ap, int)) < 0)
 389                 {
 390                         char msg[50];
 391                         snprintf(msg, sizeof(msg),
 392                                 "cmd %x failed at out byte %d of %d\n",
 393                                 cmd, n + 1, n_out);
 394                         return fdc_err(fdc, msg);
 395                 }
 396         }
 397         n_in = __va_arg(ap, int);
 398         for (n = 0; n < n_in; n++)
 399         {
 400                 int *ptr = __va_arg(ap, int *);
 401                 if (fd_in(fdc, ptr) < 0)
 402                 {
 403                         char msg[50];
 404                         snprintf(msg, sizeof(msg),
 405                                 "cmd %02x failed at in byte %d of %d\n",
 406                                 cmd, n + 1, n_in);
 407                         return fdc_err(fdc, msg);
 408                 }
 409         }
 410
 411         return 0;
 412 }
 413
 414 static int
 415 enable_fifo(fdc_p fdc)
 416 {
 417         int i, j;
 418
 419         if ((fdc->flags & FDC_HAS_FIFO) == 0) {
 420
 421                 /*
 422                  * XXX:
 423                  * Cannot use fd_cmd the normal way here, since
 424                  * this might be an invalid command. Thus we send the
 425                  * first byte, and check for an early turn of data directon.
 426                  */
 427
 428                 if (out_fdc(fdc, I8207X_CONFIGURE) < 0)
 429                         return fdc_err(fdc, "Enable FIFO failed\n");
 430
 431                 /* If command is invalid, return */
 432                 j = FDSTS_TIMEOUT;
 433                 while ((i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM))
 434                        != NE7_RQM && j-- > 0) {
 435                         if (i == (NE7_DIO | NE7_RQM)) {
 436                                 fdc_reset(fdc);
 437                                 return FD_FAILED;
 438                         }
 439                         DELAY(1);
 440                 }
 441                 if (j<0 ||
 442                     fd_cmd(fdc, 3,
 443                            0, (fifo_threshold - 1) & 0xf, 0, 0) < 0) {
 444                         fdc_reset(fdc);
 445                         return fdc_err(fdc, "Enable FIFO failed\n");
 446                 }
 447                 fdc->flags |= FDC_HAS_FIFO;
 448                 return 0;
 449         }
 450         if (fd_cmd(fdc, 4,
 451                    I8207X_CONFIGURE, 0, (fifo_threshold - 1) & 0xf, 0, 0) < 0)
 452                 return fdc_err(fdc, "Re-enable FIFO failed\n");
 453         return 0;
 454 }
 455
 456 static int
 457 fd_sense_drive_status(fdc_p fdc, int *st3p)
 458 {
 459         int st3;
 460
 461         if (fd_cmd(fdc, 2, NE7CMD_SENSED, fdc->fdu, 1, &st3))
 462         {
 463                 return fdc_err(fdc, "Sense Drive Status failed\n");
 464         }
 465         if (st3p)
 466                 *st3p = st3;
 467
 468         return 0;
 469 }
 470
 471 static int
 472 fd_sense_int(fdc_p fdc, int *st0p, int *cylp)
 473 {
 474         int cyl, st0, ret;
 475
 476         ret = fd_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
 477         if (ret) {
 478                 (void)fdc_err(fdc,
 479                               "sense intr err reading stat reg 0\n");
 480                 return ret;
 481         }
 482
 483         if (st0p)
 484                 *st0p = st0;
 485
 486         if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
 487                 /*
 488                  * There doesn't seem to have been an interrupt.
 489                  */
 490                 return FD_NOT_VALID;
 491         }
 492
 493         if (fd_in(fdc, &cyl) < 0) {
 494                 return fdc_err(fdc, "can't get cyl num\n");
 495         }
 496
 497         if (cylp)
 498                 *cylp = cyl;
 499
 500         return 0;
 501 }
 502
 503
 504 static int
 505 fd_read_status(fdc_p fdc, int fdsu)
 506 {
 507         int i, ret;
 508
 509         for (i = 0; i < 7; i++) {
 510                 /*
 511                  * XXX types are poorly chosen.  Only bytes can by read
 512                  * from the hardware, but fdc->status[] wants u_ints and
 513                  * fd_in() gives ints.
 514                  */
 515                 int status;
 516
 517                 ret = fd_in(fdc, &status);
 518                 fdc->status[i] = status;
 519                 if (ret != 0)
 520                         break;
 521         }
 522
 523         if (ret == 0)
 524                 fdc->flags |= FDC_STAT_VALID;
 525         else
 526                 fdc->flags &= ~FDC_STAT_VALID;
 527
 528         return ret;
 529 }
 530
 531 /****************************************************************************/
 532 /*                      autoconfiguration stuff                             */
 533 /****************************************************************************/
 534
 535 int
 536 fdc_alloc_resources(struct fdc_data *fdc)
 537 {
 538         device_t dev;
 539         int ispnp, ispcmcia;
 540
 541         dev = fdc->fdc_dev;
 542         ispnp = (fdc->flags & FDC_ISPNP) != 0;
 543         ispcmcia = (fdc->flags & FDC_ISPCMCIA) != 0;
 544         fdc->rid_ioport = fdc->rid_irq = fdc->rid_drq = 0;
 545         fdc->res_ioport = fdc->res_irq = fdc->res_drq = 0;
 546
 547         /*
 548          * On standard ISA, we don't just use an 8 port range
 549          * (e.g. 0x3f0-0x3f7) since that covers an IDE control
 550          * register at 0x3f6.
 551          *
 552          * Isn't PC hardware wonderful.
 553          *
 554          * The Y-E Data PCMCIA FDC doesn't have this problem, it
 555          * uses the register with offset 6 for pseudo-DMA, and the
 556          * one with offset 7 as control register.
 557          */
 558         fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,
 559                                              &fdc->rid_ioport, 0ul, ~0ul,
 560                                              ispcmcia ? 8 : (ispnp ? 1 : 6),
 561                                              RF_ACTIVE);
 562         if (fdc->res_ioport == 0) {
 563                 device_printf(dev, "cannot reserve I/O port range\n");
 564                 return ENXIO;
 565         }
 566         fdc->portt = rman_get_bustag(fdc->res_ioport);
 567         fdc->porth = rman_get_bushandle(fdc->res_ioport);
 568
 569         if (!ispcmcia) {
 570                 /*
 571                  * Some BIOSen report the device at 0x3f2-0x3f5,0x3f7
 572                  * and some at 0x3f0-0x3f5,0x3f7. We detect the former
 573                  * by checking the size and adjust the port address
 574                  * accordingly.
 575                  */
 576                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4)
 577                         fdc->port_off = -2;
 578
 579                 /*
 580                  * Register the control port range as rid 1 if it
 581                  * isn't there already. Most PnP BIOSen will have
 582                  * already done this but non-PnP configurations don't.
 583                  *
 584                  * And some (!!) report 0x3f2-0x3f5 and completely
 585                  * leave out the control register!  It seems that some
 586                  * non-antique controller chips have a different
 587                  * method of programming the transfer speed which
 588                  * doesn't require the control register, but it's
 589                  * mighty bogus as the chip still responds to the
 590                  * address for the control register.
 591                  */
 592                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
 593                         u_long ctlstart;
 594
 595                         /* Find the control port, usually 0x3f7 */
 596                         ctlstart = rman_get_start(fdc->res_ioport) +
 597                                 fdc->port_off + 7;
 598
 599                         bus_set_resource(dev, SYS_RES_IOPORT, 1, ctlstart, 1);
 600                 }
 601
 602                 /*
 603                  * Now (finally!) allocate the control port.
 604                  */
 605                 fdc->rid_ctl = 1;
 606                 fdc->res_ctl = bus_alloc_resource(dev, SYS_RES_IOPORT,
 607                                                   &fdc->rid_ctl,
 608                                                   0ul, ~0ul, 1, RF_ACTIVE);
 609                 if (fdc->res_ctl == 0) {
 610                         device_printf(dev,
 611                                       "cannot reserve control I/O port range\n");
 612                         return ENXIO;
 613                 }
 614                 fdc->ctlt = rman_get_bustag(fdc->res_ctl);
 615                 fdc->ctlh = rman_get_bushandle(fdc->res_ctl);
 616         }
 617
 618         fdc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ,
 619                                           &fdc->rid_irq, 0ul, ~0ul, 1,
 620                                           RF_ACTIVE);
 621         if (fdc->res_irq == 0) {
 622                 device_printf(dev, "cannot reserve interrupt line\n");
 623                 return ENXIO;
 624         }
 625
 626         if ((fdc->flags & FDC_NODMA) == 0) {
 627                 fdc->res_drq = bus_alloc_resource(dev, SYS_RES_DRQ,
 628                                                   &fdc->rid_drq, 0ul, ~0ul, 1,
 629                                                   RF_ACTIVE);
 630                 if (fdc->res_drq == 0) {
 631                         device_printf(dev, "cannot reserve DMA request line\n");
 632                         return ENXIO;
 633                 }
 634                 fdc->dmachan = fdc->res_drq->r_start;
 635         }
 636
 637         return 0;
 638 }
 639
 640 void
 641 fdc_release_resources(struct fdc_data *fdc)
 642 {
 643         device_t dev;
 644
 645         dev = fdc->fdc_dev;
 646         if (fdc->res_irq != 0) {
 647                 bus_deactivate_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 648                                         fdc->res_irq);
 649                 bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 650                                      fdc->res_irq);
 651         }
 652         if (fdc->res_ctl != 0) {
 653                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
 654                                         fdc->res_ctl);
 655                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
 656                                      fdc->res_ctl);
 657         }
 658         if (fdc->res_ioport != 0) {
 659                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
 660                                         fdc->res_ioport);
 661                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
 662                                      fdc->res_ioport);
 663         }
 664         if (fdc->res_drq != 0) {
 665                 bus_deactivate_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 666                                         fdc->res_drq);
 667                 bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 668                                      fdc->res_drq);
 669         }
 670 }
 671
 672 /****************************************************************************/
 673 /*                      autoconfiguration stuff                             */
 674 /****************************************************************************/
 675
 676 static struct isa_pnp_id fdc_ids[] = {
 677         {0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */
 678         {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
 679         {0}
 680 };
 681
 682 int
 683 fdc_read_ivar(device_t dev, device_t child, int which, u_long *result)
 684 {
 685         struct fdc_ivars *ivars = device_get_ivars(child);
 686
 687         switch (which) {
 688         case FDC_IVAR_FDUNIT:
 689                 *result = ivars->fdunit;
 690                 break;
 691         default:
 692                 return ENOENT;
 693         }
 694         return 0;
 695 }
 696
 697 /*
 698  * fdc controller section.
 699  */
 700 static int
 701 fdc_probe(device_t dev)
 702 {
 703         int     error, ic_type;
 704         struct  fdc_data *fdc;
 705
 706         fdc = device_get_softc(dev);
 707         bzero(fdc, sizeof *fdc);
 708         fdc->fdc_dev = dev;
 709         fdc->fdctl_wr = fdctl_wr_isa;
 710
 711         /* Check pnp ids */
 712         error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
 713         if (error == ENXIO)
 714                 return ENXIO;
 715         if (error == 0)
 716                 fdc->flags |= FDC_ISPNP;
 717
 718         /* Attempt to allocate our resources for the duration of the probe */
 719         error = fdc_alloc_resources(fdc);
 720         if (error)
 721                 goto out;
 722
 723         /* First - lets reset the floppy controller */
 724         fdout_wr(fdc, 0);
 725         DELAY(100);
 726         fdout_wr(fdc, FDO_FRST);
 727
 728         /* see if it can handle a command */
 729         if (fd_cmd(fdc, 3, NE7CMD_SPECIFY, NE7_SPEC_1(3, 240),
 730                    NE7_SPEC_2(2, 0), 0)) {
 731                 error = ENXIO;
 732                 goto out;
 733         }
 734
 735         if (fd_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type) == 0) {
 736                 ic_type = (u_char)ic_type;
 737                 switch (ic_type) {
 738                 case 0x80:
 739                         device_set_desc(dev, "NEC 765 or clone");
 740                         fdc->fdct = FDC_NE765;
 741                         break;
 742                 case 0x81:
 743                         device_set_desc(dev, "Intel 82077 or clone");
 744                         fdc->fdct = FDC_I82077;
 745                         break;
 746                 case 0x90:
 747                         device_set_desc(dev, "NEC 72065B or clone");
 748                         fdc->fdct = FDC_NE72065;
 749                         break;
 750                 default:
 751                         device_set_desc(dev, "generic floppy controller");
 752                         fdc->fdct = FDC_UNKNOWN;
 753                         break;
 754                 }
 755         }
 756
 757 out:
 758         fdc_release_resources(fdc);
 759         return (error);
 760 }
 761
 762 /*
 763  * Add a child device to the fdc controller.  It will then be probed etc.
 764  */
 765 static void
 766 fdc_add_child(device_t dev, const char *name, int unit)
 767 {
 768         int     disabled;
 769         struct fdc_ivars *ivar;
 770         device_t child;
 771
 772         ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_WAITOK | M_ZERO);
 773         if (resource_int_value(name, unit, "drive", &ivar->fdunit) != 0)
 774                 ivar->fdunit = 0;
 775         child = device_add_child(dev, name, unit);
 776         if (child == NULL)
 777                 return;
 778         device_set_ivars(child, ivar);
 779         if (resource_int_value(name, unit, "disabled", &disabled) == 0
 780             && disabled != 0)
 781                 device_disable(child);
 782 }
 783
 784 int
 785 fdc_attach(device_t dev)
 786 {
 787         struct  fdc_data *fdc;
 788         int     i, error;
 789
 790         fdc = device_get_softc(dev);
 791
 792         callout_init(&fdc->pseudointr_ch);
 793
 794         error = fdc_alloc_resources(fdc);
 795         if (error) {
 796                 device_printf(dev, "cannot re-aquire resources\n");
 797                 return error;
 798         }
 799         error = BUS_SETUP_INTR(device_get_parent(dev), dev, fdc->res_irq,
 800                                INTR_TYPE_BIO, fdc_intr, fdc, &fdc->fdc_intr);
 801         if (error) {
 802                 device_printf(dev, "cannot setup interrupt\n");
 803                 return error;
 804         }
 805         fdc->fdcu = device_get_unit(dev);
 806         fdc->flags |= FDC_ATTACHED;
 807
 808         if ((fdc->flags & FDC_NODMA) == 0) {
 809                 /* Acquire the DMA channel forever, The driver will do the rest */
 810                                 /* XXX should integrate with rman */
 811                 isa_dma_acquire(fdc->dmachan);
 812                 isa_dmainit(fdc->dmachan, 128 << 3 /* XXX max secsize */);
 813         }
 814         fdc->state = DEVIDLE;
 815
 816         /* reset controller, turn motor off, clear fdout mirror reg */
 817         fdout_wr(fdc, ((fdc->fdout = 0)));
 818         bufq_init(&fdc->head);
 819
 820         /*
 821          * Probe and attach any children.  We should probably detect
 822          * devices from the BIOS unless overridden.
 823          */
 824         for (i = resource_query_string(-1, "at", device_get_nameunit(dev));
 825              i != -1;
 826              i = resource_query_string(i, "at", device_get_nameunit(dev)))
 827                 fdc_add_child(dev, resource_query_name(i),
 828                                resource_query_unit(i));
 829
 830         return (bus_generic_attach(dev));
 831 }
 832
 833 int
 834 fdc_print_child(device_t me, device_t child)
 835 {
 836         int retval = 0;
 837
 838         retval += bus_print_child_header(me, child);
 839         retval += printf(" on %s drive %d\n", device_get_nameunit(me),
 840                fdc_get_fdunit(child));
 841
 842         return (retval);
 843 }
 844
 845 static device_method_t fdc_methods[] = {
 846         /* Device interface */
 847         DEVMETHOD(device_probe,         fdc_probe),
 848         DEVMETHOD(device_attach,        fdc_attach),
 849         DEVMETHOD(device_detach,        bus_generic_detach),
 850         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
 851         DEVMETHOD(device_suspend,       bus_generic_suspend),
 852         DEVMETHOD(device_resume,        bus_generic_resume),
 853
 854         /* Bus interface */
 855         DEVMETHOD(bus_print_child,      fdc_print_child),
 856         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
 857         /* Our children never use any other bus interface methods. */
 858
 859         { 0, 0 }
 860 };
 861
 862 static driver_t fdc_driver = {
 863         "fdc",
 864         fdc_methods,
 865         sizeof(struct fdc_data)
 866 };
 867
 868 DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);
 869
 870 /******************************************************************/
 871 /*
 872  * devices attached to the controller section.
 873  */
 874 static int
 875 fd_probe(device_t dev)
 876 {
 877         int     i;
 878         u_int   fdt, st0, st3;
 879         struct  fd_data *fd;
 880         struct  fdc_data *fdc;
 881         fdsu_t  fdsu;
 882         static int fd_fifo = 0;
 883
 884         fdsu = *(int *)device_get_ivars(dev); /* xxx cheat a bit... */
 885         fd = device_get_softc(dev);
 886         fdc = device_get_softc(device_get_parent(dev));
 887
 888         bzero(fd, sizeof *fd);
 889         fd->dev = dev;
 890         fd->fdc = fdc;
 891         fd->fdsu = fdsu;
 892         fd->fdu = device_get_unit(dev);
 893
 894 #ifdef __i386__
 895         /* look up what bios thinks we have */
 896         switch (fd->fdu) {
 897         case 0:
 898                 if ((fdc->flags & FDC_ISPCMCIA))
 899                         fdt = RTCFDT_144M;
 900                 else if (device_get_flags(fdc->fdc_dev) & FDC_PRETEND_D0)
 901                         fdt = RTCFDT_144M | RTCFDT_144M_PRETENDED;
 902                 else
 903                         fdt = (rtcin(RTC_FDISKETTE) & 0xf0);
 904                 break;
 905         case 1:
 906                 fdt = ((rtcin(RTC_FDISKETTE) << 4) & 0xf0);
 907                 break;
 908         default:
 909                 fdt = RTCFDT_NONE;
 910                 break;
 911         }
 912 #else
 913         fdt = RTCFDT_144M;      /* XXX probably */
 914 #endif
 915
 916         /* is there a unit? */
 917         if (fdt == RTCFDT_NONE)
 918                 return (ENXIO);
 919
 920         /* select it */
 921         set_motor(fdc, fdsu, TURNON);
 922         DELAY(1000000); /* 1 sec */
 923
 924         /* XXX This doesn't work before the first set_motor() */
 925         if (fd_fifo == 0 && fdc->fdct != FDC_NE765 && fdc->fdct != FDC_UNKNOWN
 926             && (device_get_flags(fdc->fdc_dev) & FDC_NO_FIFO) == 0
 927             && enable_fifo(fdc) == 0) {
 928                 device_printf(device_get_parent(dev),
 929                     "FIFO enabled, %d bytes threshold\n", fifo_threshold);
 930         }
 931         fd_fifo = 1;
 932
 933         if ((fd_cmd(fdc, 2, NE7CMD_SENSED, fdsu, 1, &st3) == 0)
 934             && (st3 & NE7_ST3_T0)) {
 935                 /* if at track 0, first seek inwards */
 936                 /* seek some steps: */
 937                 fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0);
 938                 DELAY(300000); /* ...wait a moment... */
 939                 fd_sense_int(fdc, 0, 0); /* make ctrlr happy */
 940         }
 941
 942         /* If we're at track 0 first seek inwards. */
 943         if ((fd_sense_drive_status(fdc, &st3) == 0) && (st3 & NE7_ST3_T0)) {
 944                 /* Seek some steps... */
 945                 if (fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
 946                         /* ...wait a moment... */
 947                         DELAY(300000);
 948                         /* make ctrlr happy: */
 949                         fd_sense_int(fdc, 0, 0);
 950                 }
 951         }
 952
 953         for (i = 0; i < 2; i++) {
 954                 /*
 955                  * we must recalibrate twice, just in case the
 956                  * heads have been beyond cylinder 76, since most
 957                  * FDCs still barf when attempting to recalibrate
 958                  * more than 77 steps
 959                  */
 960                 /* go back to 0: */
 961                 if (fd_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
 962                         /* a second being enough for full stroke seek*/
 963                         DELAY(i == 0 ? 1000000 : 300000);
 964
 965                         /* anything responding? */
 966                         if (fd_sense_int(fdc, &st0, 0) == 0 &&
 967                             (st0 & NE7_ST0_EC) == 0)
 968                                 break; /* already probed succesfully */
 969                 }
 970         }
 971
 972         set_motor(fdc, fdsu, TURNOFF);
 973
 974         if (st0 & NE7_ST0_EC) /* no track 0 -> no drive present */
 975                 return (ENXIO);
 976
 977         fd->track = FD_NO_TRACK;
 978         fd->fdc = fdc;
 979         fd->fdsu = fdsu;
 980         fd->options = 0;
 981         callout_init(&fd->toffhandle);
 982         callout_init(&fd->tohandle);
 983         callout_init(&fd->motor);
 984
 985         switch (fdt) {
 986         case RTCFDT_12M:
 987                 device_set_desc(dev, "1200-KB 5.25\" drive");
 988                 fd->type = FD_1200;
 989                 break;
 990         case RTCFDT_144M | RTCFDT_144M_PRETENDED:
 991                 device_set_desc(dev, "config-pretended 1440-MB 3.5\" drive");
 992                 fdt = RTCFDT_144M;
 993                 fd->type = FD_1440;
 994         case RTCFDT_144M:
 995                 device_set_desc(dev, "1440-KB 3.5\" drive");
 996                 fd->type = FD_1440;
 997                 break;
 998         case RTCFDT_288M:
 999         case RTCFDT_288M_1:
1000                 device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
1001                 fd->type = FD_1440;
1002                 break;
1003         case RTCFDT_360K:
1004                 device_set_desc(dev, "360-KB 5.25\" drive");
1005                 fd->type = FD_360;
1006                 break;
1007         case RTCFDT_720K:
1008                 printf("720-KB 3.5\" drive");
1009                 fd->type = FD_720;
1010                 break;
1011         default:
1012                 return (ENXIO);
1013         }
1014         return (0);
1015 }
1016
1017 static int
1018 fd_attach(device_t dev)
1019 {
1020         struct  fd_data *fd;
1021 #if 0
1022         int     i;
1023         int     mynor;
1024         int     typemynor;
1025         int     typesize;
1026 #endif
1027
1028         fd = device_get_softc(dev);
1029
1030         cdevsw_add(&fd_cdevsw, -1 << 6, fd->fdu << 6);
1031         make_dev(&fd_cdevsw, (fd->fdu << 6),
1032                 UID_ROOT, GID_OPERATOR, 0640, "rfd%d", fd->fdu);
1033
1034 #if 0
1035         /* Other make_dev() go here. */
1036 #endif
1037
1038         /*
1039          * Export the drive to the devstat interface.
1040          */
1041         devstat_add_entry(&fd->device_stats, device_get_name(dev),
1042                           device_get_unit(dev), 512, DEVSTAT_NO_ORDERED_TAGS,
1043                           DEVSTAT_TYPE_FLOPPY | DEVSTAT_TYPE_IF_OTHER,
1044                           DEVSTAT_PRIORITY_FD);
1045         return (0);
1046 }
1047
1048 static int
1049 fd_detach(device_t dev)
1050 {
1051         struct  fd_data *fd;
1052
1053         fd = device_get_softc(dev);
1054         callout_stop(&fd->toffhandle);
1055         callout_stop(&fd->motor);
1056
1057         return (0);
1058 }
1059
1060 static device_method_t fd_methods[] = {
1061         /* Device interface */
1062         DEVMETHOD(device_probe,         fd_probe),
1063         DEVMETHOD(device_attach,        fd_attach),
1064         DEVMETHOD(device_detach,        fd_detach),
1065         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
1066         DEVMETHOD(device_suspend,       bus_generic_suspend), /* XXX */
1067         DEVMETHOD(device_resume,        bus_generic_resume), /* XXX */
1068
1069         { 0, 0 }
1070 };
1071
1072 static driver_t fd_driver = {
1073         "fd",
1074         fd_methods,
1075         sizeof(struct fd_data)
1076 };
1077
1078 DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, 0, 0);
1079
1080 /****************************************************************************/
1081 /*                            motor control stuff                           */
1082 /*              remember to not deselect the drive we're working on         */
1083 /****************************************************************************/
1084 static void
1085 set_motor(struct fdc_data *fdc, int fdsu, int turnon)
1086 {
1087         int fdout = fdc->fdout;
1088         int needspecify = 0;
1089
1090         if(turnon) {
1091                 fdout &= ~FDO_FDSEL;
1092                 fdout |= (FDO_MOEN0 << fdsu) + fdsu;
1093         } else
1094                 fdout &= ~(FDO_MOEN0 << fdsu);
1095
1096         if(!turnon
1097            && (fdout & (FDO_MOEN0+FDO_MOEN1+FDO_MOEN2+FDO_MOEN3)) == 0)
1098                 /* gonna turn off the last drive, put FDC to bed */
1099                 fdout &= ~ (FDO_FRST|FDO_FDMAEN);
1100         else {
1101                 /* make sure controller is selected and specified */
1102                 if((fdout & (FDO_FRST|FDO_FDMAEN)) == 0)
1103                         needspecify = 1;
1104                 fdout |= (FDO_FRST|FDO_FDMAEN);
1105         }
1106
1107         fdout_wr(fdc, fdout);
1108         fdc->fdout = fdout;
1109         TRACE1("[0x%x->FDOUT]", fdout);
1110
1111         if (needspecify) {
1112                 /*
1113                  * XXX
1114                  * special case: since we have just woken up the FDC
1115                  * from its sleep, we silently assume the command will
1116                  * be accepted, and do not test for a timeout
1117                  */
1118                 (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1119                              NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1120                              0);
1121                 if (fdc->flags & FDC_HAS_FIFO)
1122                         (void) enable_fifo(fdc);
1123         }
1124 }
1125
1126 static void
1127 fd_turnoff(void *xfd)
1128 {
1129         int     s;
1130         fd_p fd = xfd;
1131
1132         TRACE1("[fd%d: turnoff]", fd->fdu);
1133
1134         s = splbio();
1135         /*
1136          * Don't turn off the motor yet if the drive is active.
1137          *
1138          * If we got here, this could only mean we missed an interrupt.
1139          * This can e. g. happen on the Y-E Date PCMCIA floppy controller
1140          * after a controller reset.  Just schedule a pseudo-interrupt
1141          * so the state machine gets re-entered.
1142          */
1143         if (fd->fdc->state != DEVIDLE && fd->fdc->fdu == fd->fdu) {
1144                 fdc_intr(fd->fdc);
1145                 splx(s);
1146                 return;
1147         }
1148
1149         fd->flags &= ~FD_MOTOR;
1150         set_motor(fd->fdc, fd->fdsu, TURNOFF);
1151         splx(s);
1152 }
1153
1154 static void
1155 fd_motor_on(void *xfd)
1156 {
1157         int     s;
1158         fd_p fd = xfd;
1159
1160         s = splbio();
1161         fd->flags &= ~FD_MOTOR_WAIT;
1162         if((fd->fdc->fd == fd) && (fd->fdc->state == MOTORWAIT))
1163         {
1164                 fdc_intr(fd->fdc);
1165         }
1166         splx(s);
1167 }
1168
1169 static void
1170 fd_turnon(fd_p fd)
1171 {
1172         if(!(fd->flags & FD_MOTOR))
1173         {
1174                 fd->flags |= (FD_MOTOR + FD_MOTOR_WAIT);
1175                 set_motor(fd->fdc, fd->fdsu, TURNON);
1176                 callout_reset(&fd->motor, hz, fd_motor_on, fd);
1177         }
1178 }
1179
1180 static void
1181 fdc_reset(fdc_p fdc)
1182 {
1183         /* Try a reset, keep motor on */
1184         fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1185         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1186         DELAY(100);
1187         /* enable FDC, but defer interrupts a moment */
1188         fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
1189         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~FDO_FDMAEN);
1190         DELAY(100);
1191         fdout_wr(fdc, fdc->fdout);
1192         TRACE1("[0x%x->FDOUT]", fdc->fdout);
1193
1194         /* XXX after a reset, silently believe the FDC will accept commands */
1195         (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1196                      NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1197                      0);
1198         if (fdc->flags & FDC_HAS_FIFO)
1199                 (void) enable_fifo(fdc);
1200 }
1201
1202 /****************************************************************************/
1203 /*                             fdc in/out                                   */
1204 /****************************************************************************/
1205 /*
1206  * FDC IO functions, take care of the main status register, timeout
1207  * in case the desired status bits are never set.
1208  *
1209  * These PIO loops initially start out with short delays between
1210  * each iteration in the expectation that the required condition
1211  * is usually met quickly, so it can be handled immediately.  After
1212  * about 1 ms, stepping is increased to achieve a better timing
1213  * accuracy in the calls to DELAY().
1214  */
1215 static int
1216 fd_in(struct fdc_data *fdc, int *ptr)
1217 {
1218         int i, j, step;
1219
1220         for (j = 0, step = 1;
1221             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != (NE7_DIO|NE7_RQM) &&
1222             j < FDSTS_TIMEOUT;
1223             j += step) {
1224                 if (i == NE7_RQM)
1225                         return (fdc_err(fdc, "ready for output in input\n"));
1226                 if (j == 1000)
1227                         step = 1000;
1228                 DELAY(step);
1229         }
1230         if (j >= FDSTS_TIMEOUT)
1231                 return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
1232 #ifdef  FDC_DEBUG
1233         i = fddata_rd(fdc);
1234         TRACE1("[FDDATA->0x%x]", (unsigned char)i);
1235         *ptr = i;
1236         return (0);
1237 #else   /* !FDC_DEBUG */
1238         i = fddata_rd(fdc);
1239         if (ptr)
1240                 *ptr = i;
1241         return (0);
1242 #endif  /* FDC_DEBUG */
1243 }
1244
1245 static int
1246 out_fdc(struct fdc_data *fdc, int x)
1247 {
1248         int i, j, step;
1249
1250         for (j = 0, step = 1;
1251             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != NE7_RQM &&
1252             j < FDSTS_TIMEOUT;
1253             j += step) {
1254                 if (i == (NE7_DIO|NE7_RQM))
1255                         return (fdc_err(fdc, "ready for input in output\n"));
1256                 if (j == 1000)
1257                         step = 1000;
1258                 DELAY(step);
1259         }
1260         if (j >= FDSTS_TIMEOUT)
1261                 return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
1262
1263         /* Send the command and return */
1264         fddata_wr(fdc, x);
1265         TRACE1("[0x%x->FDDATA]", x);
1266         return (0);
1267 }
1268
1269 /****************************************************************************/
1270 /*                           fdopen/fdclose                                 */
1271 /****************************************************************************/
1272 int
1273 Fdopen(dev_t dev, int flags, int mode, struct thread *td)
1274 {
1275         fdu_t fdu = FDUNIT(minor(dev));
1276         int type = FDTYPE(minor(dev));
1277         fd_p    fd;
1278         fdc_p   fdc;
1279
1280         /* check bounds */
1281         if ((fd = devclass_get_softc(fd_devclass, fdu)) == 0)
1282                 return (ENXIO);
1283         fdc = fd->fdc;
1284         if ((fdc == NULL) || (fd->type == NO_TYPE))
1285                 return (ENXIO);
1286         if (type > NUMDENS)
1287                 return (ENXIO);
1288         if (type == 0)
1289                 type = fd->type;
1290         else {
1291                 /*
1292                  * For each type of basic drive, make sure we are trying
1293                  * to open a type it can do,
1294                  */
1295                 if (type != fd->type) {
1296                         switch (fd->type) {
1297                         case FD_360:
1298                                 return (ENXIO);
1299                         case FD_720:
1300                                 if (   type != FD_820
1301                                     && type != FD_800
1302                                     && type != FD_640
1303                                    )
1304                                         return (ENXIO);
1305                                 break;
1306                         case FD_1200:
1307                                 switch (type) {
1308                                 case FD_1480:
1309                                         type = FD_1480in5_25;
1310                                         break;
1311                                 case FD_1440:
1312                                         type = FD_1440in5_25;
1313                                         break;
1314                                 case FD_1232:
1315                                         break;
1316                                 case FD_820:
1317                                         type = FD_820in5_25;
1318                                         break;
1319                                 case FD_800:
1320                                         type = FD_800in5_25;
1321                                         break;
1322                                 case FD_720:
1323                                         type = FD_720in5_25;
1324                                         break;
1325                                 case FD_640:
1326                                         type = FD_640in5_25;
1327                                         break;
1328                                 case FD_360:
1329                                         type = FD_360in5_25;
1330                                         break;
1331                                 default:
1332                                         return(ENXIO);
1333                                 }
1334                                 break;
1335                         case FD_1440:
1336                                 if (   type != FD_1720
1337                                     && type != FD_1480
1338                                     && type != FD_1200
1339                                     && type != FD_820
1340                                     && type != FD_800
1341                                     && type != FD_720
1342                                     && type != FD_640
1343                                     )
1344                                         return(ENXIO);
1345                                 break;
1346                         }
1347                 }
1348         }
1349         fd->ft = fd_types + type - 1;
1350         fd->flags |= FD_OPEN;
1351         /*
1352          * Clearing the DMA overrun counter at open time is a bit messy.
1353          * Since we're only managing one counter per controller, opening
1354          * the second drive could mess it up.  Anyway, if the DMA overrun
1355          * condition is really persistent, it will eventually time out
1356          * still.  OTOH, clearing it here will ensure we'll at least start
1357          * trying again after a previous (maybe even long ago) failure.
1358          * Also, this is merely a stop-gap measure only that should not
1359          * happen during normal operation, so we can tolerate it to be a
1360          * bit sloppy about this.
1361          */
1362         fdc->dma_overruns = 0;
1363
1364         return 0;
1365 }
1366
1367 int
1368 fdclose(dev_t dev, int flags, int mode, struct thread *td)
1369 {
1370         fdu_t fdu = FDUNIT(minor(dev));
1371         struct fd_data *fd;
1372
1373         fd = devclass_get_softc(fd_devclass, fdu);
1374         fd->flags &= ~FD_OPEN;
1375         fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG);
1376
1377         return (0);
1378 }
1379
1380 /****************************************************************************/
1381 /*                               fdstrategy                                 */
1382 /****************************************************************************/
1383 void
1384 fdstrategy(struct buf *bp)
1385 {
1386         unsigned nblocks, blknum, cando;
1387         int     s;
1388         fdu_t   fdu;
1389         fdc_p   fdc;
1390         fd_p    fd;
1391         size_t  fdblk;
1392
1393         fdu = FDUNIT(minor(bp->b_dev));
1394         fd = devclass_get_softc(fd_devclass, fdu);
1395         if (fd == 0)
1396                 panic("fdstrategy: buf for nonexistent device (%#lx, %#lx)",
1397                       (u_long)major(bp->b_dev), (u_long)minor(bp->b_dev));
1398         fdc = fd->fdc;
1399         if (fd->type == NO_TYPE) {
1400                 bp->b_error = ENXIO;
1401                 bp->b_flags |= B_ERROR;
1402                 goto bad;
1403         };
1404
1405         fdblk = 128 << (fd->ft->secsize);
1406         if (!(bp->b_flags & B_FORMAT)) {
1407                 if (bp->b_blkno < 0) {
1408                         printf(
1409                 "fd%d: fdstrat: bad request blkno = %lu, bcount = %ld\n",
1410                                fdu, (u_long)bp->b_blkno, bp->b_bcount);
1411                         bp->b_error = EINVAL;
1412                         bp->b_flags |= B_ERROR;
1413                         goto bad;
1414                 }
1415                 if ((bp->b_bcount % fdblk) != 0) {
1416                         bp->b_error = EINVAL;
1417                         bp->b_flags |= B_ERROR;
1418                         goto bad;
1419                 }
1420         }
1421
1422         /*
1423          * Set up block calculations.
1424          */
1425         if (bp->b_blkno > 20000000) {
1426                 /*
1427                  * Reject unreasonably high block number, prevent the
1428                  * multiplication below from overflowing.
1429                  */
1430                 bp->b_error = EINVAL;
1431                 bp->b_flags |= B_ERROR;
1432                 goto bad;
1433         }
1434         blknum = (unsigned) bp->b_blkno * DEV_BSIZE/fdblk;
1435         nblocks = fd->ft->size;
1436         bp->b_resid = 0;
1437         if (blknum + (bp->b_bcount / fdblk) > nblocks) {
1438                 if (blknum <= nblocks) {
1439                         cando = (nblocks - blknum) * fdblk;
1440                         bp->b_resid = bp->b_bcount - cando;
1441                         if (cando == 0)
1442                                 goto bad;       /* not actually bad but EOF */
1443                 } else {
1444                         bp->b_error = EINVAL;
1445                         bp->b_flags |= B_ERROR;
1446                         goto bad;
1447                 }
1448         }
1449         bp->b_pblkno = bp->b_blkno;
1450         s = splbio();
1451         bufqdisksort(&fdc->head, bp);
1452         callout_stop(&fd->toffhandle);
1453
1454         /* Tell devstat we are starting on the transaction */
1455         devstat_start_transaction(&fd->device_stats);
1456         device_busy(fd->dev);
1457
1458         fdstart(fdc);
1459         splx(s);
1460         return;
1461
1462 bad:
1463         biodone(bp);
1464 }
1465
1466 /***************************************************************\
1467 *                               fdstart                         *
1468 * We have just queued something.. if the controller is not busy *
1469 * then simulate the case where it has just finished a command   *
1470 * So that it (the interrupt routine) looks on the queue for more*
1471 * work to do and picks up what we just added.                   *
1472 * If the controller is already busy, we need do nothing, as it  *
1473 * will pick up our work when the present work completes         *
1474 \***************************************************************/
1475 static void
1476 fdstart(struct fdc_data *fdc)
1477 {
1478         int s;
1479
1480         s = splbio();
1481         if(fdc->state == DEVIDLE)
1482         {
1483                 fdc_intr(fdc);
1484         }
1485         splx(s);
1486 }
1487
1488 static void
1489 fd_iotimeout(void *xfdc)
1490 {
1491         fdc_p fdc;
1492         int s;
1493
1494         fdc = xfdc;
1495         TRACE1("fd%d[fd_iotimeout()]", fdc->fdu);
1496
1497         /*
1498          * Due to IBM's brain-dead design, the FDC has a faked ready
1499          * signal, hardwired to ready == true. Thus, any command
1500          * issued if there's no diskette in the drive will _never_
1501          * complete, and must be aborted by resetting the FDC.
1502          * Many thanks, Big Blue!
1503          * The FDC must not be reset directly, since that would
1504          * interfere with the state machine.  Instead, pretend that
1505          * the command completed but was invalid.  The state machine
1506          * will reset the FDC and retry once.
1507          */
1508         s = splbio();
1509         fdc->status[0] = NE7_ST0_IC_IV;
1510         fdc->flags &= ~FDC_STAT_VALID;
1511         fdc->state = IOTIMEDOUT;
1512         fdc_intr(fdc);
1513         splx(s);
1514 }
1515
1516 /* just ensure it has the right spl */
1517 static void
1518 fd_pseudointr(void *xfdc)
1519 {
1520         int     s;
1521
1522         s = splbio();
1523         fdc_intr(xfdc);
1524         splx(s);
1525 }
1526
1527 /***********************************************************************\
1528 *                                 fdintr                                *
1529 * keep calling the state machine until it returns a 0                   *
1530 * ALWAYS called at SPLBIO                                               *
1531 \***********************************************************************/
1532 static void
1533 fdc_intr(void *xfdc)
1534 {
1535         fdc_p fdc = xfdc;
1536         while(fdstate(fdc))
1537                 ;
1538 }
1539
1540 /*
1541  * magic pseudo-DMA initialization for YE FDC. Sets count and
1542  * direction
1543  */
1544 #define SET_BCDR(fdc,wr,cnt,port) \
1545         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port,  \
1546             ((cnt)-1) & 0xff);                                           \
1547         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port + 1, \
1548             ((wr ? 0x80 : 0) | ((((cnt)-1) >> 8) & 0x7f)));
1549
1550 /*
1551  * fdcpio(): perform programmed IO read/write for YE PCMCIA floppy
1552  */
1553 static int fdcpio(fdc_p fdc, long flags, caddr_t addr, u_int count)
1554 {
1555         u_char *cptr = (u_char *)addr;
1556
1557         if (flags & B_READ) {
1558                 if (fdc->state != PIOREAD) {
1559                         fdc->state = PIOREAD;
1560                         return(0);
1561                 };
1562                 SET_BCDR(fdc, 0, count, 0);
1563                 bus_space_read_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1564                     FDC_YE_DATAPORT, cptr, count);
1565         } else {
1566                 bus_space_write_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1567                     FDC_YE_DATAPORT, cptr, count);
1568                 SET_BCDR(fdc, 0, count, 0);
1569         };
1570         return(1);
1571 }
1572
1573 /***********************************************************************\
1574 * The controller state machine.                                         *
1575 * if it returns a non zero value, it should be called again immediatly  *
1576 \***********************************************************************/
1577 static int
1578 fdstate(fdc_p fdc)
1579 {
1580         int read, format, head, i, sec = 0, sectrac, st0, cyl, st3;
1581         unsigned blknum = 0, b_cylinder = 0;
1582         fdu_t fdu = fdc->fdu;
1583         fd_p fd;
1584         struct buf *bp;
1585         struct fd_formb *finfo = NULL;
1586         size_t fdblk;
1587
1588         bp = fdc->bp;
1589         if (bp == NULL) {
1590                 bp = bufq_first(&fdc->head);
1591                 if (bp != NULL) {
1592                         bufq_remove(&fdc->head, bp);
1593                         fdc->bp = bp;
1594                 }
1595         }
1596         if (bp == NULL) {
1597                 /***********************************************\
1598                 * nothing left for this controller to do        *
1599                 * Force into the IDLE state,                    *
1600                 \***********************************************/
1601                 fdc->state = DEVIDLE;
1602                 if (fdc->fd) {
1603                         device_printf(fdc->fdc_dev,
1604                             "unexpected valid fd pointer\n");
1605                         fdc->fd = (fd_p) 0;
1606                         fdc->fdu = -1;
1607                 }
1608                 TRACE1("[fdc%d IDLE]", fdc->fdcu);
1609                 return (0);
1610         }
1611         fdu = FDUNIT(minor(bp->b_dev));
1612         fd = devclass_get_softc(fd_devclass, fdu);
1613         fdblk = 128 << fd->ft->secsize;
1614         if (fdc->fd && (fd != fdc->fd))
1615                 device_printf(fd->dev, "confused fd pointers\n");
1616         read = bp->b_flags & B_READ;
1617         format = bp->b_flags & B_FORMAT;
1618         if (format) {
1619                 finfo = (struct fd_formb *)bp->b_data;
1620                 fd->skip = (char *)&(finfo->fd_formb_cylno(0))
1621                         - (char *)finfo;
1622         }
1623         if (fdc->state == DOSEEK || fdc->state == SEEKCOMPLETE) {
1624                 blknum = (unsigned) bp->b_pblkno * DEV_BSIZE/fdblk +
1625                         fd->skip/fdblk;
1626                 b_cylinder = blknum / (fd->ft->sectrac * fd->ft->heads);
1627         }
1628         TRACE1("fd%d", fdu);
1629         TRACE1("[%s]", fdstates[fdc->state]);
1630         TRACE1("(0x%x)", fd->flags);
1631         callout_reset(&fd->toffhandle, 4 * hz, fd_turnoff, fd);
1632         switch (fdc->state)
1633         {
1634         case DEVIDLE:
1635         case FINDWORK:  /* we have found new work */
1636                 fdc->retry = 0;
1637                 fd->skip = 0;
1638                 fdc->fd = fd;
1639                 fdc->fdu = fdu;
1640                 fdc->fdctl_wr(fdc, fd->ft->trans);
1641                 TRACE1("[0x%x->FDCTL]", fd->ft->trans);
1642                 /*******************************************************\
1643                 * If the next drive has a motor startup pending, then   *
1644                 * it will start up in its own good time         *
1645                 \*******************************************************/
1646                 if(fd->flags & FD_MOTOR_WAIT) {
1647                         fdc->state = MOTORWAIT;
1648                         return (0); /* come back later */
1649                 }
1650                 /*******************************************************\
1651                 * Maybe if it's not starting, it SHOULD be starting     *
1652                 \*******************************************************/
1653                 if (!(fd->flags & FD_MOTOR))
1654                 {
1655                         fdc->state = MOTORWAIT;
1656                         fd_turnon(fd);
1657                         return (0);
1658                 }
1659                 else    /* at least make sure we are selected */
1660                 {
1661                         set_motor(fdc, fd->fdsu, TURNON);
1662                 }
1663                 if (fdc->flags & FDC_NEEDS_RESET) {
1664                         fdc->state = RESETCTLR;
1665                         fdc->flags &= ~FDC_NEEDS_RESET;
1666                 } else
1667                         fdc->state = DOSEEK;
1668                 break;
1669         case DOSEEK:
1670                 if (b_cylinder == (unsigned)fd->track)
1671                 {
1672                         fdc->state = SEEKCOMPLETE;
1673                         break;
1674                 }
1675                 if (fd_cmd(fdc, 3, NE7CMD_SEEK,
1676                            fd->fdsu, b_cylinder * fd->ft->steptrac,
1677                            0))
1678                 {
1679                         /*
1680                          * seek command not accepted, looks like
1681                          * the FDC went off to the Saints...
1682                          */
1683                         fdc->retry = 6; /* try a reset */
1684                         return(retrier(fdc));
1685                 }
1686                 fd->track = FD_NO_TRACK;
1687                 fdc->state = SEEKWAIT;
1688                 return(0);      /* will return later */
1689         case SEEKWAIT:
1690                 /* allow heads to settle */
1691                 callout_reset(&fdc->pseudointr_ch, hz / 16,
1692                                fd_pseudointr, fdc);
1693                 fdc->state = SEEKCOMPLETE;
1694                 return(0);      /* will return later */
1695         case SEEKCOMPLETE : /* SEEK DONE, START DMA */
1696                 /* Make sure seek really happened*/
1697                 if(fd->track == FD_NO_TRACK) {
1698                         int descyl = b_cylinder * fd->ft->steptrac;
1699                         do {
1700                                 /*
1701                                  * This might be a "ready changed" interrupt,
1702                                  * which cannot really happen since the
1703                                  * RDY pin is hardwired to + 5 volts.  This
1704                                  * generally indicates a "bouncing" intr
1705                                  * line, so do one of the following:
1706                                  *
1707                                  * When running on an enhanced FDC that is
1708                                  * known to not go stuck after responding
1709                                  * with INVALID, fetch all interrupt states
1710                                  * until seeing either an INVALID or a
1711                                  * real interrupt condition.
1712                                  *
1713                                  * When running on a dumb old NE765, give
1714                                  * up immediately.  The controller will
1715                                  * provide up to four dummy RC interrupt
1716                                  * conditions right after reset (for the
1717                                  * corresponding four drives), so this is
1718                                  * our only chance to get notice that it
1719                                  * was not the FDC that caused the interrupt.
1720                                  */
1721                                 if (fd_sense_int(fdc, &st0, &cyl)
1722                                     == FD_NOT_VALID)
1723                                         return 0;
1724                                 if(fdc->fdct == FDC_NE765
1725                                    && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
1726                                         return 0; /* hope for a real intr */
1727                         } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
1728
1729                         if (0 == descyl) {
1730                                 int failed = 0;
1731                                 /*
1732                                  * seek to cyl 0 requested; make sure we are
1733                                  * really there
1734                                  */
1735                                 if (fd_sense_drive_status(fdc, &st3))
1736                                         failed = 1;
1737                                 if ((st3 & NE7_ST3_T0) == 0) {
1738                                         printf(
1739                 "fd%d: Seek to cyl 0, but not really there (ST3 = %b)\n",
1740                                                fdu, st3, NE7_ST3BITS);
1741                                         failed = 1;
1742                                 }
1743
1744                                 if (failed) {
1745                                         if(fdc->retry < 3)
1746                                                 fdc->retry = 3;
1747                                         return (retrier(fdc));
1748                                 }
1749                         }
1750
1751                         if (cyl != descyl) {
1752                                 printf(
1753                 "fd%d: Seek to cyl %d failed; am at cyl %d (ST0 = 0x%x)\n",
1754                                        fdu, descyl, cyl, st0);
1755                                 if (fdc->retry < 3)
1756                                         fdc->retry = 3;
1757                                 return (retrier(fdc));
1758                         }
1759                 }
1760
1761                 fd->track = b_cylinder;
1762                 if (!(fdc->flags & FDC_NODMA))
1763                         isa_dmastart(bp->b_flags, bp->b_data+fd->skip,
1764                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1765                 sectrac = fd->ft->sectrac;
1766                 sec = blknum %  (sectrac * fd->ft->heads);
1767                 head = sec / sectrac;
1768                 sec = sec % sectrac + 1;
1769                 fd->hddrv = ((head&1)<<2)+fdu;
1770
1771                 if(format || !read)
1772                 {
1773                         /* make sure the drive is writable */
1774                         if(fd_sense_drive_status(fdc, &st3) != 0)
1775                         {
1776                                 /* stuck controller? */
1777                                 if (!(fdc->flags & FDC_NODMA))
1778                                         isa_dmadone(bp->b_flags,
1779                                                     bp->b_data + fd->skip,
1780                                                     format ? bp->b_bcount : fdblk,
1781                                                     fdc->dmachan);
1782                                 fdc->retry = 6; /* reset the beast */
1783                                 return (retrier(fdc));
1784                         }
1785                         if(st3 & NE7_ST3_WP)
1786                         {
1787                                 /*
1788                                  * XXX YES! this is ugly.
1789                                  * in order to force the current operation
1790                                  * to fail, we will have to fake an FDC
1791                                  * error - all error handling is done
1792                                  * by the retrier()
1793                                  */
1794                                 fdc->status[0] = NE7_ST0_IC_AT;
1795                                 fdc->status[1] = NE7_ST1_NW;
1796                                 fdc->status[2] = 0;
1797                                 fdc->status[3] = fd->track;
1798                                 fdc->status[4] = head;
1799                                 fdc->status[5] = sec;
1800                                 fdc->retry = 8; /* break out immediately */
1801                                 fdc->state = IOTIMEDOUT; /* not really... */
1802                                 return (1);
1803                         }
1804                 }
1805
1806                 if (format) {
1807                         if (fdc->flags & FDC_NODMA) {
1808                                 /*
1809                                  * This seems to be necessary for
1810                                  * whatever obscure reason; if we omit
1811                                  * it, we end up filling the sector ID
1812                                  * fields of the newly formatted track
1813                                  * entirely with garbage, causing
1814                                  * `wrong cylinder' errors all over
1815                                  * the place when trying to read them
1816                                  * back.
1817                                  *
1818                                  * Umpf.
1819                                  */
1820                                 SET_BCDR(fdc, 1, bp->b_bcount, 0);
1821
1822                                 (void)fdcpio(fdc,bp->b_flags,
1823                                         bp->b_data+fd->skip,
1824                                         bp->b_bcount);
1825
1826                         }
1827                         /* formatting */
1828                         if(fd_cmd(fdc, 6,  NE7CMD_FORMAT, head << 2 | fdu,
1829                                   finfo->fd_formb_secshift,
1830                                   finfo->fd_formb_nsecs,
1831                                   finfo->fd_formb_gaplen,
1832                                   finfo->fd_formb_fillbyte, 0)) {
1833                                 /* controller fell over */
1834                                 if (!(fdc->flags & FDC_NODMA))
1835                                         isa_dmadone(bp->b_flags,
1836                                                     bp->b_data + fd->skip,
1837                                                     format ? bp->b_bcount : fdblk,
1838                                                     fdc->dmachan);
1839                                 fdc->retry = 6;
1840                                 return (retrier(fdc));
1841                         }
1842                 } else {
1843                         if (fdc->flags & FDC_NODMA) {
1844                                 /*
1845                                  * this seems to be necessary even when
1846                                  * reading data
1847                                  */
1848                                 SET_BCDR(fdc, 1, fdblk, 0);
1849
1850                                 /*
1851                                  * perform the write pseudo-DMA before
1852                                  * the WRITE command is sent
1853                                  */
1854                                 if (!read)
1855                                         (void)fdcpio(fdc,bp->b_flags,
1856                                             bp->b_data+fd->skip,
1857                                             fdblk);
1858                         }
1859                         if (fd_cmd(fdc, 9,
1860                                    (read ? NE7CMD_READ : NE7CMD_WRITE),
1861                                    head << 2 | fdu,  /* head & unit */
1862                                    fd->track,        /* track */
1863                                    head,
1864                                    sec,              /* sector + 1 */
1865                                    fd->ft->secsize,  /* sector size */
1866                                    sectrac,          /* sectors/track */
1867                                    fd->ft->gap,      /* gap size */
1868                                    fd->ft->datalen,  /* data length */
1869                                    0)) {
1870                                 /* the beast is sleeping again */
1871                                 if (!(fdc->flags & FDC_NODMA))
1872                                         isa_dmadone(bp->b_flags,
1873                                                     bp->b_data + fd->skip,
1874                                                     format ? bp->b_bcount : fdblk,
1875                                                     fdc->dmachan);
1876                                 fdc->retry = 6;
1877                                 return (retrier(fdc));
1878                         }
1879                 }
1880                 if (fdc->flags & FDC_NODMA)
1881                         /*
1882                          * if this is a read, then simply await interrupt
1883                          * before performing PIO
1884                          */
1885                         if (read && !fdcpio(fdc,bp->b_flags,
1886                             bp->b_data+fd->skip,fdblk)) {
1887                                 callout_reset(&fd->tohandle, hz,
1888                                                 fd_iotimeout, fdc);
1889                                 return(0);      /* will return later */
1890                         };
1891
1892                 /*
1893                  * write (or format) operation will fall through and
1894                  * await completion interrupt
1895                  */
1896                 fdc->state = IOCOMPLETE;
1897                 callout_reset(&fd->tohandle, hz, fd_iotimeout, fdc);
1898                 return (0);     /* will return later */
1899         case PIOREAD:
1900                 /*
1901                  * actually perform the PIO read.  The IOCOMPLETE case
1902                  * removes the timeout for us.
1903                  */
1904                 (void)fdcpio(fdc,bp->b_flags,bp->b_data+fd->skip,fdblk);
1905                 fdc->state = IOCOMPLETE;
1906                 /* FALLTHROUGH */
1907         case IOCOMPLETE: /* IO DONE, post-analyze */
1908                 callout_stop(&fd->tohandle);
1909
1910                 if (fd_read_status(fdc, fd->fdsu)) {
1911                         if (!(fdc->flags & FDC_NODMA))
1912                                 isa_dmadone(bp->b_flags, bp->b_data + fd->skip,
1913                                             format ? bp->b_bcount : fdblk,
1914                                             fdc->dmachan);
1915                         if (fdc->retry < 6)
1916                                 fdc->retry = 6; /* force a reset */
1917                         return (retrier(fdc));
1918                 }
1919
1920                 fdc->state = IOTIMEDOUT;
1921
1922                 /* FALLTHROUGH */
1923
1924         case IOTIMEDOUT:
1925                 if (!(fdc->flags & FDC_NODMA))
1926                         isa_dmadone(bp->b_flags, bp->b_data + fd->skip,
1927                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1928                 if (fdc->status[0] & NE7_ST0_IC) {
1929                         if ((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1930                             && fdc->status[1] & NE7_ST1_OR) {
1931                                 /*
1932                                  * DMA overrun. Someone hogged the bus and
1933                                  * didn't release it in time for the next
1934                                  * FDC transfer.
1935                                  *
1936                                  * We normally restart this without bumping
1937                                  * the retry counter.  However, in case
1938                                  * something is seriously messed up (like
1939                                  * broken hardware), we rather limit the
1940                                  * number of retries so the IO operation
1941                                  * doesn't block indefinately.
1942                                  */
1943                                 if (fdc->dma_overruns++ < FDC_DMAOV_MAX) {
1944                                         fdc->state = SEEKCOMPLETE;
1945                                         return (1);
1946                                 } /* else fall through */
1947                         }
1948                         if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_IV
1949                                 && fdc->retry < 6)
1950                                 fdc->retry = 6; /* force a reset */
1951                         else if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1952                                 && fdc->status[2] & NE7_ST2_WC
1953                                 && fdc->retry < 3)
1954                                 fdc->retry = 3; /* force recalibrate */
1955                         return (retrier(fdc));
1956                 }
1957                 /* All OK */
1958                 /* Operation successful, retry DMA overruns again next time. */
1959                 fdc->dma_overruns = 0;
1960                 fd->skip += fdblk;
1961                 if (!format && fd->skip < bp->b_bcount - bp->b_resid) {
1962                         /* set up next transfer */
1963                         fdc->state = DOSEEK;
1964                 } else {
1965                         /* ALL DONE */
1966                         fd->skip = 0;
1967                         fdc->bp = NULL;
1968                         device_unbusy(fd->dev);
1969                         devstat_end_transaction_buf(&fd->device_stats, bp);
1970                         biodone(bp);
1971                         fdc->fd = (fd_p) 0;
1972                         fdc->fdu = -1;
1973                         fdc->state = FINDWORK;
1974                 }
1975                 return (1);
1976         case RESETCTLR:
1977                 fdc_reset(fdc);
1978                 fdc->retry++;
1979                 fdc->state = RESETCOMPLETE;
1980                 return (0);
1981         case RESETCOMPLETE:
1982                 /*
1983                  * Discard all the results from the reset so that they
1984                  * can't cause an unexpected interrupt later.
1985                  */
1986                 for (i = 0; i < 4; i++)
1987                         (void)fd_sense_int(fdc, &st0, &cyl);
1988                 fdc->state = STARTRECAL;
1989                 /* Fall through. */
1990         case STARTRECAL:
1991                 if(fd_cmd(fdc, 2, NE7CMD_RECAL, fdu, 0)) {
1992                         /* arrgl */
1993                         fdc->retry = 6;
1994                         return (retrier(fdc));
1995                 }
1996                 fdc->state = RECALWAIT;
1997                 return (0);     /* will return later */
1998         case RECALWAIT:
1999                 /* allow heads to settle */
2000                 callout_reset(&fdc->pseudointr_ch, hz / 8, fd_pseudointr, fdc);
2001                 fdc->state = RECALCOMPLETE;
2002                 return (0);     /* will return later */
2003         case RECALCOMPLETE:
2004                 do {
2005                         /*
2006                          * See SEEKCOMPLETE for a comment on this:
2007                          */
2008                         if (fd_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
2009                                 return 0;
2010                         if(fdc->fdct == FDC_NE765
2011                            && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
2012                                 return 0; /* hope for a real intr */
2013                 } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
2014                 if ((st0 & NE7_ST0_IC) != NE7_ST0_IC_NT || cyl != 0)
2015                 {
2016                         if(fdc->retry > 3)
2017                                 /*
2018                                  * a recalibrate from beyond cylinder 77
2019                                  * will "fail" due to the FDC limitations;
2020                                  * since people used to complain much about
2021                                  * the failure message, try not logging
2022                                  * this one if it seems to be the first
2023                                  * time in a line
2024                                  */
2025                                 printf("fd%d: recal failed ST0 %b cyl %d\n",
2026                                        fdu, st0, NE7_ST0BITS, cyl);
2027                         if(fdc->retry < 3) fdc->retry = 3;
2028                         return (retrier(fdc));
2029                 }
2030                 fd->track = 0;
2031                 /* Seek (probably) necessary */
2032                 fdc->state = DOSEEK;
2033                 return (1);     /* will return immediatly */
2034         case MOTORWAIT:
2035                 if(fd->flags & FD_MOTOR_WAIT)
2036                 {
2037                         return (0); /* time's not up yet */
2038                 }
2039                 if (fdc->flags & FDC_NEEDS_RESET) {
2040                         fdc->state = RESETCTLR;
2041                         fdc->flags &= ~FDC_NEEDS_RESET;
2042                 } else {
2043                         /*
2044                          * If all motors were off, then the controller was
2045                          * reset, so it has lost track of the current
2046                          * cylinder.  Recalibrate to handle this case.
2047                          * But first, discard the results of the reset.
2048                          */
2049                         fdc->state = RESETCOMPLETE;
2050                 }
2051                 return (1);     /* will return immediatly */
2052         default:
2053                 device_printf(fdc->fdc_dev, "unexpected FD int->");
2054                 if (fd_read_status(fdc, fd->fdsu) == 0)
2055                         printf("FDC status :%x %x %x %x %x %x %x   ",
2056                                fdc->status[0],
2057                                fdc->status[1],
2058                                fdc->status[2],
2059                                fdc->status[3],
2060                                fdc->status[4],
2061                                fdc->status[5],
2062                                fdc->status[6] );
2063                 else
2064                         printf("No status available   ");
2065                 if (fd_sense_int(fdc, &st0, &cyl) != 0)
2066                 {
2067                         printf("[controller is dead now]\n");
2068                         return (0);
2069                 }
2070                 printf("ST0 = %x, PCN = %x\n", st0, cyl);
2071                 return (0);
2072         }
2073         /*XXX confusing: some branches return immediately, others end up here*/
2074         return (1); /* Come back immediatly to new state */
2075 }
2076
2077 static int
2078 retrier(struct fdc_data *fdc)
2079 {
2080         struct buf *bp;
2081         struct fd_data *fd;
2082         int fdu;
2083
2084         bp = fdc->bp;
2085
2086         /* XXX shouldn't this be cached somewhere?  */
2087         fdu = FDUNIT(minor(bp->b_dev));
2088         fd = devclass_get_softc(fd_devclass, fdu);
2089         if (fd->options & FDOPT_NORETRY)
2090                 goto fail;
2091
2092         switch (fdc->retry) {
2093         case 0: case 1: case 2:
2094                 fdc->state = SEEKCOMPLETE;
2095                 break;
2096         case 3: case 4: case 5:
2097                 fdc->state = STARTRECAL;
2098                 break;
2099         case 6:
2100                 fdc->state = RESETCTLR;
2101                 break;
2102         case 7:
2103                 break;
2104         default:
2105         fail:
2106                 {
2107                         int printerror = (fd->options & FDOPT_NOERRLOG) == 0;
2108
2109                         if (printerror) {
2110                                 /*
2111                                  * note: use the correct device for more
2112                                  * verbose error reporting.
2113                                  */
2114                                 dev_t subdev;
2115
2116                                 subdev = make_sub_dev(bp->b_dev,
2117                                     (FDUNIT(minor(bp->b_dev))<<3)|RAW_PART);
2118                                 diskerr(bp, subdev,
2119                                         "hard error", LOG_PRINTF,
2120                                         fdc->fd->skip / DEV_BSIZE,
2121                                         (struct disklabel *)NULL);
2122                         }
2123                         if (printerror) {
2124                                 if (fdc->flags & FDC_STAT_VALID)
2125                                         printf(
2126                         " (ST0 %b ST1 %b ST2 %b cyl %u hd %u sec %u)\n",
2127                                                fdc->status[0], NE7_ST0BITS,
2128                                                fdc->status[1], NE7_ST1BITS,
2129                                                fdc->status[2], NE7_ST2BITS,
2130                                                fdc->status[3], fdc->status[4],
2131                                                fdc->status[5]);
2132                                 else
2133                                         printf(" (No status)\n");
2134                         }
2135                 }
2136                 bp->b_flags |= B_ERROR;
2137                 bp->b_error = EIO;
2138                 bp->b_resid += bp->b_bcount - fdc->fd->skip;
2139                 fdc->bp = NULL;
2140                 fdc->fd->skip = 0;
2141                 device_unbusy(fd->dev);
2142                 devstat_end_transaction_buf(&fdc->fd->device_stats, bp);
2143                 biodone(bp);
2144                 fdc->state = FINDWORK;
2145                 fdc->flags |= FDC_NEEDS_RESET;
2146                 fdc->fd = (fd_p) 0;
2147                 fdc->fdu = -1;
2148                 return (1);
2149         }
2150         fdc->retry++;
2151         return (1);
2152 }
2153
2154 static int
2155 fdformat(dev_t dev, struct fd_formb *finfo, struct thread *td)
2156 {
2157         struct proc *p = td->td_proc;
2158         fdu_t   fdu;
2159         fd_p    fd;
2160
2161         struct buf *bp;
2162         int rv = 0, s;
2163         size_t fdblk;
2164
2165         fdu     = FDUNIT(minor(dev));
2166         fd      = devclass_get_softc(fd_devclass, fdu);
2167         fdblk = 128 << fd->ft->secsize;
2168
2169         /* set up a buffer header for fdstrategy() */
2170         bp = malloc(sizeof(struct buf), M_TEMP, M_WAITOK | M_ZERO);
2171
2172         /*
2173          * keep the process from being swapped
2174          */
2175         PHOLD(p);
2176         BUF_LOCKINIT(bp);
2177         BUF_LOCK(bp, LK_EXCLUSIVE);
2178         bp->b_flags = B_PHYS | B_FORMAT;
2179
2180         /*
2181          * calculate a fake blkno, so fdstrategy() would initiate a
2182          * seek to the requested cylinder
2183          */
2184         bp->b_blkno = (finfo->cyl * (fd->ft->sectrac * fd->ft->heads)
2185                 + finfo->head * fd->ft->sectrac) * fdblk / DEV_BSIZE;
2186
2187         bp->b_bcount = sizeof(struct fd_idfield_data) * finfo->fd_formb_nsecs;
2188         bp->b_data = (caddr_t)finfo;
2189
2190         /* now do the format */
2191         bp->b_dev = dev;
2192         BUF_STRATEGY(bp, 0);
2193
2194         /* ...and wait for it to complete */
2195         s = splbio();
2196         while(!(bp->b_flags & B_DONE)) {
2197                 rv = tsleep((caddr_t)bp, 0, "fdform", 20 * hz);
2198                 if (rv == EWOULDBLOCK)
2199                         break;
2200         }
2201         splx(s);
2202
2203         if (rv == EWOULDBLOCK) {
2204                 /* timed out */
2205                 rv = EIO;
2206                 device_unbusy(fd->dev);
2207                 biodone(bp);
2208         }
2209         if (bp->b_flags & B_ERROR)
2210                 rv = bp->b_error;
2211         /*
2212          * allow the process to be swapped
2213          */
2214         PRELE(p);
2215         BUF_UNLOCK(bp);
2216         BUF_LOCKFREE(bp);
2217         free(bp, M_TEMP);
2218         return rv;
2219 }
2220
2221 /*
2222  * TODO: don't allocate buffer on stack.
2223  */
2224
2225 static int
2226 fdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
2227 {
2228         fdu_t   fdu = FDUNIT(minor(dev));
2229         fd_p    fd = devclass_get_softc(fd_devclass, fdu);
2230         size_t fdblk;
2231
2232         struct fd_type *fdt;
2233         struct disklabel *dl;
2234         struct fdc_status *fsp;
2235         char buffer[DEV_BSIZE];
2236         int error = 0;
2237
2238         fdblk = 128 << fd->ft->secsize;
2239
2240         switch (cmd) {
2241         case DIOCGDINFO:
2242                 bzero(buffer, sizeof (buffer));
2243                 dl = (struct disklabel *)buffer;
2244                 dl->d_secsize = fdblk;
2245                 fdt = fd->ft;
2246                 dl->d_secpercyl = fdt->size / fdt->tracks;
2247                 dl->d_type = DTYPE_FLOPPY;
2248
2249                 if (readdisklabel(dev, dl)
2250                     == NULL)
2251                         error = 0;
2252                 else
2253                         error = EINVAL;
2254
2255                 *(struct disklabel *)addr = *dl;
2256                 break;
2257
2258         case DIOCSDINFO:
2259                 if ((flag & FWRITE) == 0)
2260                         error = EBADF;
2261                 break;
2262
2263         case DIOCWLABEL:
2264                 if ((flag & FWRITE) == 0)
2265                         error = EBADF;
2266                 break;
2267
2268         case DIOCWDINFO:
2269                 if ((flag & FWRITE) == 0) {
2270                         error = EBADF;
2271                         break;
2272                 }
2273
2274                 dl = (struct disklabel *)addr;
2275
2276                 if ((error = setdisklabel((struct disklabel *)buffer, dl,
2277                                           (u_long)0)) != 0)
2278                         break;
2279
2280                 error = writedisklabel(dev, (struct disklabel *)buffer);
2281                 break;
2282         case FD_FORM:
2283                 if ((flag & FWRITE) == 0)
2284                         error = EBADF;  /* must be opened for writing */
2285                 else if (((struct fd_formb *)addr)->format_version !=
2286                         FD_FORMAT_VERSION)
2287                         error = EINVAL; /* wrong version of formatting prog */
2288                 else
2289                         error = fdformat(dev, (struct fd_formb *)addr, td);
2290                 break;
2291
2292         case FD_GTYPE:                  /* get drive type */
2293                 *(struct fd_type *)addr = *fd->ft;
2294                 break;
2295
2296         case FD_STYPE:                  /* set drive type */
2297                 /* this is considered harmful; only allow for superuser */
2298                 if (suser(td) != 0)
2299                         return EPERM;
2300                 *fd->ft = *(struct fd_type *)addr;
2301                 break;
2302
2303         case FD_GOPTS:                  /* get drive options */
2304                 *(int *)addr = fd->options;
2305                 break;
2306
2307         case FD_SOPTS:                  /* set drive options */
2308                 fd->options = *(int *)addr;
2309                 break;
2310
2311         case FD_GSTAT:
2312                 fsp = (struct fdc_status *)addr;
2313                 if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
2314                         return EINVAL;
2315                 memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
2316                 break;
2317
2318         default:
2319                 error = ENOTTY;
2320                 break;
2321         }
2322         return (error);
2323 }
2324
2325 /*
2326  * Hello emacs, these are the
2327  * Local Variables:
2328  *  c-indent-level:               8
2329  *  c-continued-statement-offset: 8
2330  *  c-continued-brace-offset:     0
2331  *  c-brace-offset:              -8
2332  *  c-brace-imaginary-offset:     0
2333  *  c-argdecl-indent:             8
2334  *  c-label-offset:              -8
2335  *  c++-hanging-braces:           1
2336  *  c++-access-specifier-offset: -8
2337  *  c++-empty-arglist-indent:     8
2338  *  c++-friend-offset:            0
2339  * End:
2340  */