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 1.30 2006/05/24 21:50:11 dillon 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 #include <sys/thread2.h>
  83
  84 #include <machine/clock.h>
  85 #include <machine/ioctl_fd.h>
  86 #include <machine/resource.h>
  87 #include <machine/stdarg.h>
  88
  89 #include <bus/isa/isavar.h>
  90 #include <bus/isa/isareg.h>
  91 #include "fdreg.h"
  92 #include "fdc.h"
  93 #include <bus/isa/rtc.h>
  94
  95 /* configuration flags */
  96 #define FDC_PRETEND_D0  (1 << 0)        /* pretend drive 0 to be there */
  97 #define FDC_NO_FIFO     (1 << 2)        /* do not enable FIFO  */
  98
  99 /* internally used only, not really from CMOS: */
 100 #define RTCFDT_144M_PRETENDED   0x1000
 101
 102 /* error returns for fd_cmd() */
 103 #define FD_FAILED -1
 104 #define FD_NOT_VALID -2
 105 #define FDC_ERRMAX      100     /* do not log more */
 106 /*
 107  * Stop retrying after this many DMA overruns.  Since each retry takes
 108  * one revolution, with 300 rpm., 25 retries take approximately 10
 109  * seconds which the read attempt will block in case the DMA overrun
 110  * is persistent.
 111  */
 112 #define FDC_DMAOV_MAX   25
 113
 114 /*
 115  * Timeout value for the PIO loops to wait until the FDC main status
 116  * register matches our expectations (request for master, direction
 117  * bit).  This is supposed to be a number of microseconds, although
 118  * timing might actually not be very accurate.
 119  *
 120  * Timeouts of 100 msec are believed to be required for some broken
 121  * (old) hardware.
 122  */
 123 #define FDSTS_TIMEOUT   100000
 124
 125 #define NUMTYPES 17
 126 #define NUMDENS  (NUMTYPES - 7)
 127
 128 /* These defines (-1) must match index for fd_types */
 129 #define F_TAPE_TYPE     0x020   /* bit for fd_types to indicate tape */
 130 #define NO_TYPE         0       /* must match NO_TYPE in ft.c */
 131 #define FD_1720         1
 132 #define FD_1480         2
 133 #define FD_1440         3
 134 #define FD_1200         4
 135 #define FD_820          5
 136 #define FD_800          6
 137 #define FD_720          7
 138 #define FD_360          8
 139 #define FD_640          9
 140 #define FD_1232         10
 141
 142 #define FD_1480in5_25   11
 143 #define FD_1440in5_25   12
 144 #define FD_820in5_25    13
 145 #define FD_800in5_25    14
 146 #define FD_720in5_25    15
 147 #define FD_360in5_25    16
 148 #define FD_640in5_25    17
 149
 150
 151 static struct fd_type fd_types[NUMTYPES] =
 152 {
 153 { 21,2,0xFF,0x04,82,3444,1,FDC_500KBPS,2,0x0C,2 }, /* 1.72M in HD 3.5in */
 154 { 18,2,0xFF,0x1B,82,2952,1,FDC_500KBPS,2,0x6C,1 }, /* 1.48M in HD 3.5in */
 155 { 18,2,0xFF,0x1B,80,2880,1,FDC_500KBPS,2,0x6C,1 }, /* 1.44M in HD 3.5in */
 156 { 15,2,0xFF,0x1B,80,2400,1,FDC_500KBPS,2,0x54,1 }, /*  1.2M in HD 5.25/3.5 */
 157 { 10,2,0xFF,0x10,82,1640,1,FDC_250KBPS,2,0x2E,1 }, /*  820K in HD 3.5in */
 158 { 10,2,0xFF,0x10,80,1600,1,FDC_250KBPS,2,0x2E,1 }, /*  800K in HD 3.5in */
 159 {  9,2,0xFF,0x20,80,1440,1,FDC_250KBPS,2,0x50,1 }, /*  720K in HD 3.5in */
 160 {  9,2,0xFF,0x2A,40, 720,1,FDC_250KBPS,2,0x50,1 }, /*  360K in DD 5.25in */
 161 {  8,2,0xFF,0x2A,80,1280,1,FDC_250KBPS,2,0x50,1 }, /*  640K in DD 5.25in */
 162 {  8,3,0xFF,0x35,77,1232,1,FDC_500KBPS,2,0x74,1 }, /* 1.23M in HD 5.25in */
 163
 164 { 18,2,0xFF,0x02,82,2952,1,FDC_500KBPS,2,0x02,2 }, /* 1.48M in HD 5.25in */
 165 { 18,2,0xFF,0x02,80,2880,1,FDC_500KBPS,2,0x02,2 }, /* 1.44M in HD 5.25in */
 166 { 10,2,0xFF,0x10,82,1640,1,FDC_300KBPS,2,0x2E,1 }, /*  820K in HD 5.25in */
 167 { 10,2,0xFF,0x10,80,1600,1,FDC_300KBPS,2,0x2E,1 }, /*  800K in HD 5.25in */
 168 {  9,2,0xFF,0x20,80,1440,1,FDC_300KBPS,2,0x50,1 }, /*  720K in HD 5.25in */
 169 {  9,2,0xFF,0x23,40, 720,2,FDC_300KBPS,2,0x50,1 }, /*  360K in HD 5.25in */
 170 {  8,2,0xFF,0x2A,80,1280,1,FDC_300KBPS,2,0x50,1 }, /*  640K in HD 5.25in */
 171 };
 172
 173 #define DRVS_PER_CTLR 2         /* 2 floppies */
 174
 175 /***********************************************************************\
 176 * Per controller structure.                                             *
 177 \***********************************************************************/
 178 devclass_t fdc_devclass;
 179
 180 /***********************************************************************\
 181 * Per drive structure.                                                  *
 182 * N per controller  (DRVS_PER_CTLR)                                     *
 183 \***********************************************************************/
 184 struct fd_data {
 185         struct  fdc_data *fdc;  /* pointer to controller structure */
 186         int     fdsu;           /* this units number on this controller */
 187         int     type;           /* Drive type (FD_1440...) */
 188         struct  fd_type *ft;    /* pointer to the type descriptor */
 189         int     flags;
 190 #define FD_OPEN         0x01    /* it's open            */
 191 #define FD_ACTIVE       0x02    /* it's active          */
 192 #define FD_MOTOR        0x04    /* motor should be on   */
 193 #define FD_MOTOR_WAIT   0x08    /* motor coming up      */
 194         int     skip;
 195         int     hddrv;
 196 #define FD_NO_TRACK -2
 197         int     track;          /* where we think the head is */
 198         int     options;        /* user configurable options, see ioctl_fd.h */
 199         struct  callout toffhandle;
 200         struct  callout tohandle;
 201         struct  callout motor;
 202         struct  devstat device_stats;
 203         device_t dev;
 204         fdu_t   fdu;
 205 };
 206
 207 struct fdc_ivars {
 208         int     fdunit;
 209 };
 210 static devclass_t fd_devclass;
 211
 212 /***********************************************************************\
 213 * Throughout this file the following conventions will be used:          *
 214 * fd is a pointer to the fd_data struct for the drive in question       *
 215 * fdc is a pointer to the fdc_data struct for the controller            *
 216 * fdu is the floppy drive unit number                                   *
 217 * fdcu is the floppy controller unit number                             *
 218 * fdsu is the floppy drive unit number on that controller. (sub-unit)   *
 219 \***********************************************************************/
 220
 221 /* internal functions */
 222 static  void fdc_intr(void *);
 223 static void set_motor(struct fdc_data *, int, int);
 224 #  define TURNON 1
 225 #  define TURNOFF 0
 226 static timeout_t fd_turnoff;
 227 static timeout_t fd_motor_on;
 228 static void fd_turnon(struct fd_data *);
 229 static void fdc_reset(fdc_p);
 230 static int fd_in(struct fdc_data *, int *);
 231 static int out_fdc(struct fdc_data *, int);
 232 static void fdstart(struct fdc_data *);
 233 static timeout_t fd_iotimeout;
 234 static timeout_t fd_pseudointr;
 235 static int fdstate(struct fdc_data *);
 236 static int retrier(struct fdc_data *);
 237 static int fdformat(dev_t, struct fd_formb *, struct thread *);
 238
 239 static int enable_fifo(fdc_p fdc);
 240
 241 static int fifo_threshold = 8;  /* XXX: should be accessible via sysctl */
 242
 243
 244 #define DEVIDLE         0
 245 #define FINDWORK        1
 246 #define DOSEEK          2
 247 #define SEEKCOMPLETE    3
 248 #define IOCOMPLETE      4
 249 #define RECALCOMPLETE   5
 250 #define STARTRECAL      6
 251 #define RESETCTLR       7
 252 #define SEEKWAIT        8
 253 #define RECALWAIT       9
 254 #define MOTORWAIT       10
 255 #define IOTIMEDOUT      11
 256 #define RESETCOMPLETE   12
 257 #define PIOREAD         13
 258
 259 #ifdef  FDC_DEBUG
 260 static char const * const fdstates[] =
 261 {
 262 "DEVIDLE",
 263 "FINDWORK",
 264 "DOSEEK",
 265 "SEEKCOMPLETE",
 266 "IOCOMPLETE",
 267 "RECALCOMPLETE",
 268 "STARTRECAL",
 269 "RESETCTLR",
 270 "SEEKWAIT",
 271 "RECALWAIT",
 272 "MOTORWAIT",
 273 "IOTIMEDOUT",
 274 "RESETCOMPLETE",
 275 "PIOREAD",
 276 };
 277
 278 /* CAUTION: fd_debug causes huge amounts of logging output */
 279 static int volatile fd_debug = 0;
 280 #define TRACE0(arg) if(fd_debug) printf(arg)
 281 #define TRACE1(arg1, arg2) if(fd_debug) printf(arg1, arg2)
 282 #else /* FDC_DEBUG */
 283 #define TRACE0(arg)
 284 #define TRACE1(arg1, arg2)
 285 #endif /* FDC_DEBUG */
 286
 287 void
 288 fdout_wr(fdc_p fdc, u_int8_t v)
 289 {
 290         bus_space_write_1(fdc->portt, fdc->porth, FDOUT+fdc->port_off, v);
 291 }
 292
 293 static u_int8_t
 294 fdsts_rd(fdc_p fdc)
 295 {
 296         return bus_space_read_1(fdc->portt, fdc->porth, FDSTS+fdc->port_off);
 297 }
 298
 299 static void
 300 fddata_wr(fdc_p fdc, u_int8_t v)
 301 {
 302         bus_space_write_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off, v);
 303 }
 304
 305 static u_int8_t
 306 fddata_rd(fdc_p fdc)
 307 {
 308         return bus_space_read_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off);
 309 }
 310
 311 static void
 312 fdctl_wr_isa(fdc_p fdc, u_int8_t v)
 313 {
 314         bus_space_write_1(fdc->ctlt, fdc->ctlh, 0, v);
 315 }
 316
 317 #if 0
 318
 319 static u_int8_t
 320 fdin_rd(fdc_p fdc)
 321 {
 322         return bus_space_read_1(fdc->portt, fdc->porth, FDIN);
 323 }
 324
 325 #endif
 326
 327 static  d_open_t        Fdopen; /* NOTE, not fdopen */
 328 static  d_close_t       fdclose;
 329 static  d_ioctl_t       fdioctl;
 330 static  d_strategy_t    fdstrategy;
 331
 332 static struct cdevsw fd_cdevsw = {
 333         /* name */      "fd",
 334         /* maj */       FD_CDEV_MAJOR,
 335         /* flags */     D_DISK,
 336         /* port */      NULL,
 337         /* clone */     NULL,
 338
 339         /* open */      Fdopen,
 340         /* close */     fdclose,
 341         /* read */      physread,
 342         /* write */     physwrite,
 343         /* ioctl */     fdioctl,
 344         /* poll */      nopoll,
 345         /* mmap */      nommap,
 346         /* strategy */  fdstrategy,
 347         /* dump */      nodump,
 348         /* psize */     nopsize
 349 };
 350
 351 static int
 352 fdc_err(struct fdc_data *fdc, const char *s)
 353 {
 354         fdc->fdc_errs++;
 355         if (s) {
 356                 if (fdc->fdc_errs < FDC_ERRMAX)
 357                         device_printf(fdc->fdc_dev, "%s", s);
 358                 else if (fdc->fdc_errs == FDC_ERRMAX)
 359                         device_printf(fdc->fdc_dev, "too many errors, not "
 360                                                     "logging any more\n");
 361         }
 362
 363         return FD_FAILED;
 364 }
 365
 366 /*
 367  * fd_cmd: Send a command to the chip.  Takes a varargs with this structure:
 368  * Unit number,
 369  * # of output bytes, output bytes as ints ...,
 370  * # of input bytes, input bytes as ints ...
 371  */
 372 int
 373 fd_cmd(struct fdc_data *fdc, int n_out, ...)
 374 {
 375         u_char cmd;
 376         int n_in;
 377         int n;
 378         __va_list ap;
 379
 380         __va_start(ap, n_out);
 381         cmd = (u_char)(__va_arg(ap, int));
 382         __va_end(ap);
 383         __va_start(ap, n_out);
 384         for (n = 0; n < n_out; n++)
 385         {
 386                 if (out_fdc(fdc, __va_arg(ap, int)) < 0)
 387                 {
 388                         char msg[50];
 389                         snprintf(msg, sizeof(msg),
 390                                 "cmd %x failed at out byte %d of %d\n",
 391                                 cmd, n + 1, n_out);
 392                         return fdc_err(fdc, msg);
 393                 }
 394         }
 395         n_in = __va_arg(ap, int);
 396         for (n = 0; n < n_in; n++)
 397         {
 398                 int *ptr = __va_arg(ap, int *);
 399                 if (fd_in(fdc, ptr) < 0)
 400                 {
 401                         char msg[50];
 402                         snprintf(msg, sizeof(msg),
 403                                 "cmd %02x failed at in byte %d of %d\n",
 404                                 cmd, n + 1, n_in);
 405                         return fdc_err(fdc, msg);
 406                 }
 407         }
 408
 409         return 0;
 410 }
 411
 412 static int
 413 enable_fifo(fdc_p fdc)
 414 {
 415         int i, j;
 416
 417         if ((fdc->flags & FDC_HAS_FIFO) == 0) {
 418
 419                 /*
 420                  * XXX:
 421                  * Cannot use fd_cmd the normal way here, since
 422                  * this might be an invalid command. Thus we send the
 423                  * first byte, and check for an early turn of data directon.
 424                  */
 425
 426                 if (out_fdc(fdc, I8207X_CONFIGURE) < 0)
 427                         return fdc_err(fdc, "Enable FIFO failed\n");
 428
 429                 /* If command is invalid, return */
 430                 j = FDSTS_TIMEOUT;
 431                 while ((i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM))
 432                        != NE7_RQM && j-- > 0) {
 433                         if (i == (NE7_DIO | NE7_RQM)) {
 434                                 fdc_reset(fdc);
 435                                 return FD_FAILED;
 436                         }
 437                         DELAY(1);
 438                 }
 439                 if (j<0 ||
 440                     fd_cmd(fdc, 3,
 441                            0, (fifo_threshold - 1) & 0xf, 0, 0) < 0) {
 442                         fdc_reset(fdc);
 443                         return fdc_err(fdc, "Enable FIFO failed\n");
 444                 }
 445                 fdc->flags |= FDC_HAS_FIFO;
 446                 return 0;
 447         }
 448         if (fd_cmd(fdc, 4,
 449                    I8207X_CONFIGURE, 0, (fifo_threshold - 1) & 0xf, 0, 0) < 0)
 450                 return fdc_err(fdc, "Re-enable FIFO failed\n");
 451         return 0;
 452 }
 453
 454 static int
 455 fd_sense_drive_status(fdc_p fdc, int *st3p)
 456 {
 457         int st3;
 458
 459         if (fd_cmd(fdc, 2, NE7CMD_SENSED, fdc->fdu, 1, &st3))
 460         {
 461                 return fdc_err(fdc, "Sense Drive Status failed\n");
 462         }
 463         if (st3p)
 464                 *st3p = st3;
 465
 466         return 0;
 467 }
 468
 469 static int
 470 fd_sense_int(fdc_p fdc, int *st0p, int *cylp)
 471 {
 472         int cyl, st0, ret;
 473
 474         ret = fd_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
 475         if (ret) {
 476                 (void)fdc_err(fdc,
 477                               "sense intr err reading stat reg 0\n");
 478                 return ret;
 479         }
 480
 481         if (st0p)
 482                 *st0p = st0;
 483
 484         if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
 485                 /*
 486                  * There doesn't seem to have been an interrupt.
 487                  */
 488                 return FD_NOT_VALID;
 489         }
 490
 491         if (fd_in(fdc, &cyl) < 0) {
 492                 return fdc_err(fdc, "can't get cyl num\n");
 493         }
 494
 495         if (cylp)
 496                 *cylp = cyl;
 497
 498         return 0;
 499 }
 500
 501
 502 static int
 503 fd_read_status(fdc_p fdc, int fdsu)
 504 {
 505         int i, ret;
 506
 507         for (i = 0; i < 7; i++) {
 508                 /*
 509                  * XXX types are poorly chosen.  Only bytes can by read
 510                  * from the hardware, but fdc->status[] wants u_ints and
 511                  * fd_in() gives ints.
 512                  */
 513                 int status;
 514
 515                 ret = fd_in(fdc, &status);
 516                 fdc->status[i] = status;
 517                 if (ret != 0)
 518                         break;
 519         }
 520
 521         if (ret == 0)
 522                 fdc->flags |= FDC_STAT_VALID;
 523         else
 524                 fdc->flags &= ~FDC_STAT_VALID;
 525
 526         return ret;
 527 }
 528
 529 /****************************************************************************/
 530 /*                      autoconfiguration stuff                             */
 531 /****************************************************************************/
 532
 533 int
 534 fdc_alloc_resources(struct fdc_data *fdc)
 535 {
 536         device_t dev;
 537         int ispnp, ispcmcia;
 538
 539         dev = fdc->fdc_dev;
 540         ispnp = (fdc->flags & FDC_ISPNP) != 0;
 541         ispcmcia = (fdc->flags & FDC_ISPCMCIA) != 0;
 542         fdc->rid_ioport = fdc->rid_irq = fdc->rid_drq = 0;
 543         fdc->res_ioport = fdc->res_irq = fdc->res_drq = 0;
 544
 545         /*
 546          * On standard ISA, we don't just use an 8 port range
 547          * (e.g. 0x3f0-0x3f7) since that covers an IDE control
 548          * register at 0x3f6.
 549          *
 550          * Isn't PC hardware wonderful.
 551          *
 552          * The Y-E Data PCMCIA FDC doesn't have this problem, it
 553          * uses the register with offset 6 for pseudo-DMA, and the
 554          * one with offset 7 as control register.
 555          */
 556         fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,
 557                                              &fdc->rid_ioport, 0ul, ~0ul,
 558                                              ispcmcia ? 8 : (ispnp ? 1 : 6),
 559                                              RF_ACTIVE);
 560         if (fdc->res_ioport == 0) {
 561                 device_printf(dev, "cannot reserve I/O port range\n");
 562                 return ENXIO;
 563         }
 564         fdc->portt = rman_get_bustag(fdc->res_ioport);
 565         fdc->porth = rman_get_bushandle(fdc->res_ioport);
 566
 567         if (!ispcmcia) {
 568                 /*
 569                  * Some BIOSen report the device at 0x3f2-0x3f5,0x3f7
 570                  * and some at 0x3f0-0x3f5,0x3f7. We detect the former
 571                  * by checking the size and adjust the port address
 572                  * accordingly.
 573                  */
 574                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4)
 575                         fdc->port_off = -2;
 576
 577                 /*
 578                  * Register the control port range as rid 1 if it
 579                  * isn't there already. Most PnP BIOSen will have
 580                  * already done this but non-PnP configurations don't.
 581                  *
 582                  * And some (!!) report 0x3f2-0x3f5 and completely
 583                  * leave out the control register!  It seems that some
 584                  * non-antique controller chips have a different
 585                  * method of programming the transfer speed which
 586                  * doesn't require the control register, but it's
 587                  * mighty bogus as the chip still responds to the
 588                  * address for the control register.
 589                  */
 590                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
 591                         u_long ctlstart;
 592
 593                         /* Find the control port, usually 0x3f7 */
 594                         ctlstart = rman_get_start(fdc->res_ioport) +
 595                                 fdc->port_off + 7;
 596
 597                         bus_set_resource(dev, SYS_RES_IOPORT, 1, ctlstart, 1);
 598                 }
 599
 600                 /*
 601                  * Now (finally!) allocate the control port.
 602                  */
 603                 fdc->rid_ctl = 1;
 604                 fdc->res_ctl = bus_alloc_resource(dev, SYS_RES_IOPORT,
 605                                                   &fdc->rid_ctl,
 606                                                   0ul, ~0ul, 1, RF_ACTIVE);
 607                 if (fdc->res_ctl == 0) {
 608                         device_printf(dev,
 609                                       "cannot reserve control I/O port range\n");
 610                         return ENXIO;
 611                 }
 612                 fdc->ctlt = rman_get_bustag(fdc->res_ctl);
 613                 fdc->ctlh = rman_get_bushandle(fdc->res_ctl);
 614         }
 615
 616         fdc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ,
 617                                           &fdc->rid_irq, 0ul, ~0ul, 1,
 618                                           RF_ACTIVE);
 619         if (fdc->res_irq == 0) {
 620                 device_printf(dev, "cannot reserve interrupt line\n");
 621                 return ENXIO;
 622         }
 623
 624         if ((fdc->flags & FDC_NODMA) == 0) {
 625                 fdc->res_drq = bus_alloc_resource(dev, SYS_RES_DRQ,
 626                                                   &fdc->rid_drq, 0ul, ~0ul, 1,
 627                                                   RF_ACTIVE);
 628                 if (fdc->res_drq == 0) {
 629                         device_printf(dev, "cannot reserve DMA request line\n");
 630                         return ENXIO;
 631                 }
 632                 fdc->dmachan = fdc->res_drq->r_start;
 633         }
 634
 635         return 0;
 636 }
 637
 638 void
 639 fdc_release_resources(struct fdc_data *fdc)
 640 {
 641         device_t dev;
 642
 643         dev = fdc->fdc_dev;
 644         if (fdc->res_irq != 0) {
 645                 bus_deactivate_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 646                                         fdc->res_irq);
 647                 bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 648                                      fdc->res_irq);
 649         }
 650         if (fdc->res_ctl != 0) {
 651                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
 652                                         fdc->res_ctl);
 653                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
 654                                      fdc->res_ctl);
 655         }
 656         if (fdc->res_ioport != 0) {
 657                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
 658                                         fdc->res_ioport);
 659                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
 660                                      fdc->res_ioport);
 661         }
 662         if (fdc->res_drq != 0) {
 663                 bus_deactivate_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 664                                         fdc->res_drq);
 665                 bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 666                                      fdc->res_drq);
 667         }
 668 }
 669
 670 /****************************************************************************/
 671 /*                      autoconfiguration stuff                             */
 672 /****************************************************************************/
 673
 674 static struct isa_pnp_id fdc_ids[] = {
 675         {0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */
 676         {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
 677         {0}
 678 };
 679
 680 int
 681 fdc_read_ivar(device_t dev, device_t child, int which, u_long *result)
 682 {
 683         struct fdc_ivars *ivars = device_get_ivars(child);
 684
 685         switch (which) {
 686         case FDC_IVAR_FDUNIT:
 687                 *result = ivars->fdunit;
 688                 break;
 689         default:
 690                 return ENOENT;
 691         }
 692         return 0;
 693 }
 694
 695 /*
 696  * fdc controller section.
 697  */
 698 static int
 699 fdc_probe(device_t dev)
 700 {
 701         int     error, ic_type;
 702         struct  fdc_data *fdc;
 703
 704         fdc = device_get_softc(dev);
 705         bzero(fdc, sizeof *fdc);
 706         fdc->fdc_dev = dev;
 707         fdc->fdctl_wr = fdctl_wr_isa;
 708
 709         /* Check pnp ids */
 710         error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
 711         if (error == ENXIO)
 712                 return ENXIO;
 713         if (error == 0)
 714                 fdc->flags |= FDC_ISPNP;
 715
 716         /* Attempt to allocate our resources for the duration of the probe */
 717         error = fdc_alloc_resources(fdc);
 718         if (error)
 719                 goto out;
 720
 721         /* First - lets reset the floppy controller */
 722         fdout_wr(fdc, 0);
 723         DELAY(100);
 724         fdout_wr(fdc, FDO_FRST);
 725
 726         /* see if it can handle a command */
 727         if (fd_cmd(fdc, 3, NE7CMD_SPECIFY, NE7_SPEC_1(3, 240),
 728                    NE7_SPEC_2(2, 0), 0)) {
 729                 error = ENXIO;
 730                 goto out;
 731         }
 732
 733         if (fd_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type) == 0) {
 734                 ic_type = (u_char)ic_type;
 735                 switch (ic_type) {
 736                 case 0x80:
 737                         device_set_desc(dev, "NEC 765 or clone");
 738                         fdc->fdct = FDC_NE765;
 739                         break;
 740                 case 0x81:
 741                         device_set_desc(dev, "Intel 82077 or clone");
 742                         fdc->fdct = FDC_I82077;
 743                         break;
 744                 case 0x90:
 745                         device_set_desc(dev, "NEC 72065B or clone");
 746                         fdc->fdct = FDC_NE72065;
 747                         break;
 748                 default:
 749                         device_set_desc(dev, "generic floppy controller");
 750                         fdc->fdct = FDC_UNKNOWN;
 751                         break;
 752                 }
 753         }
 754
 755 out:
 756         fdc_release_resources(fdc);
 757         return (error);
 758 }
 759
 760 /*
 761  * Add a child device to the fdc controller.  It will then be probed etc.
 762  */
 763 static void
 764 fdc_add_child(device_t dev, const char *name, int unit)
 765 {
 766         int     disabled;
 767         struct fdc_ivars *ivar;
 768         device_t child;
 769
 770         ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_WAITOK | M_ZERO);
 771         if (resource_int_value(name, unit, "drive", &ivar->fdunit) != 0)
 772                 ivar->fdunit = 0;
 773         child = device_add_child(dev, name, unit);
 774         if (child == NULL)
 775                 return;
 776         device_set_ivars(child, ivar);
 777         if (resource_int_value(name, unit, "disabled", &disabled) == 0
 778             && disabled != 0)
 779                 device_disable(child);
 780 }
 781
 782 int
 783 fdc_attach(device_t dev)
 784 {
 785         struct  fdc_data *fdc;
 786         int     i, error;
 787
 788         fdc = device_get_softc(dev);
 789
 790         callout_init(&fdc->pseudointr_ch);
 791
 792         error = fdc_alloc_resources(fdc);
 793         if (error) {
 794                 device_printf(dev, "cannot re-aquire resources\n");
 795                 return error;
 796         }
 797         error = BUS_SETUP_INTR(device_get_parent(dev), dev, fdc->res_irq,
 798                                0, fdc_intr, fdc,
 799                                &fdc->fdc_intr, NULL);
 800         if (error) {
 801                 device_printf(dev, "cannot setup interrupt\n");
 802                 return error;
 803         }
 804         fdc->fdcu = device_get_unit(dev);
 805         fdc->flags |= FDC_ATTACHED;
 806
 807         if ((fdc->flags & FDC_NODMA) == 0) {
 808                 /* Acquire the DMA channel forever, The driver will do the rest */
 809                                 /* XXX should integrate with rman */
 810                 isa_dma_acquire(fdc->dmachan);
 811                 isa_dmainit(fdc->dmachan, 128 << 3 /* XXX max secsize */);
 812         }
 813         fdc->state = DEVIDLE;
 814
 815         /* reset controller, turn motor off, clear fdout mirror reg */
 816         fdout_wr(fdc, ((fdc->fdout = 0)));
 817         bioq_init(&fdc->bio_queue);
 818
 819         /*
 820          * Probe and attach any children.  We should probably detect
 821          * devices from the BIOS unless overridden.
 822          */
 823         for (i = resource_query_string(-1, "at", device_get_nameunit(dev));
 824              i != -1;
 825              i = resource_query_string(i, "at", device_get_nameunit(dev)))
 826                 fdc_add_child(dev, resource_query_name(i),
 827                                resource_query_unit(i));
 828
 829         return (bus_generic_attach(dev));
 830 }
 831
 832 int
 833 fdc_print_child(device_t me, device_t child)
 834 {
 835         int retval = 0;
 836
 837         retval += bus_print_child_header(me, child);
 838         retval += printf(" on %s drive %d\n", device_get_nameunit(me),
 839                fdc_get_fdunit(child));
 840
 841         return (retval);
 842 }
 843
 844 static device_method_t fdc_methods[] = {
 845         /* Device interface */
 846         DEVMETHOD(device_probe,         fdc_probe),
 847         DEVMETHOD(device_attach,        fdc_attach),
 848         DEVMETHOD(device_detach,        bus_generic_detach),
 849         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
 850         DEVMETHOD(device_suspend,       bus_generic_suspend),
 851         DEVMETHOD(device_resume,        bus_generic_resume),
 852
 853         /* Bus interface */
 854         DEVMETHOD(bus_print_child,      fdc_print_child),
 855         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
 856         /* Our children never use any other bus interface methods. */
 857
 858         { 0, 0 }
 859 };
 860
 861 static driver_t fdc_driver = {
 862         "fdc",
 863         fdc_methods,
 864         sizeof(struct fdc_data)
 865 };
 866
 867 DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);
 868
 869 /******************************************************************/
 870 /*
 871  * devices attached to the controller section.
 872  */
 873 static int
 874 fd_probe(device_t dev)
 875 {
 876         int     i;
 877         u_int   fdt, st0, st3;
 878         struct  fd_data *fd;
 879         struct  fdc_data *fdc;
 880         fdsu_t  fdsu;
 881         static int fd_fifo = 0;
 882
 883         fdsu = *(int *)device_get_ivars(dev); /* xxx cheat a bit... */
 884         fd = device_get_softc(dev);
 885         fdc = device_get_softc(device_get_parent(dev));
 886
 887         bzero(fd, sizeof *fd);
 888         fd->dev = dev;
 889         fd->fdc = fdc;
 890         fd->fdsu = fdsu;
 891         fd->fdu = device_get_unit(dev);
 892
 893 #ifdef __i386__
 894         /* look up what bios thinks we have */
 895         switch (fd->fdu) {
 896         case 0:
 897                 if ((fdc->flags & FDC_ISPCMCIA))
 898                         fdt = RTCFDT_144M;
 899                 else if (device_get_flags(fdc->fdc_dev) & FDC_PRETEND_D0)
 900                         fdt = RTCFDT_144M | RTCFDT_144M_PRETENDED;
 901                 else
 902                         fdt = (rtcin(RTC_FDISKETTE) & 0xf0);
 903                 break;
 904         case 1:
 905                 fdt = ((rtcin(RTC_FDISKETTE) << 4) & 0xf0);
 906                 break;
 907         default:
 908                 fdt = RTCFDT_NONE;
 909                 break;
 910         }
 911 #else
 912         fdt = RTCFDT_144M;      /* XXX probably */
 913 #endif
 914
 915         /* is there a unit? */
 916         if (fdt == RTCFDT_NONE)
 917                 return (ENXIO);
 918
 919         /* select it */
 920         set_motor(fdc, fdsu, TURNON);
 921         DELAY(1000000); /* 1 sec */
 922
 923         /* XXX This doesn't work before the first set_motor() */
 924         if (fd_fifo == 0 && fdc->fdct != FDC_NE765 && fdc->fdct != FDC_UNKNOWN
 925             && (device_get_flags(fdc->fdc_dev) & FDC_NO_FIFO) == 0
 926             && enable_fifo(fdc) == 0) {
 927                 device_printf(device_get_parent(dev),
 928                     "FIFO enabled, %d bytes threshold\n", fifo_threshold);
 929         }
 930         fd_fifo = 1;
 931
 932         if ((fd_cmd(fdc, 2, NE7CMD_SENSED, fdsu, 1, &st3) == 0)
 933             && (st3 & NE7_ST3_T0)) {
 934                 /* if at track 0, first seek inwards */
 935                 /* seek some steps: */
 936                 fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0);
 937                 DELAY(300000); /* ...wait a moment... */
 938                 fd_sense_int(fdc, 0, 0); /* make ctrlr happy */
 939         }
 940
 941         /* If we're at track 0 first seek inwards. */
 942         if ((fd_sense_drive_status(fdc, &st3) == 0) && (st3 & NE7_ST3_T0)) {
 943                 /* Seek some steps... */
 944                 if (fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
 945                         /* ...wait a moment... */
 946                         DELAY(300000);
 947                         /* make ctrlr happy: */
 948                         fd_sense_int(fdc, 0, 0);
 949                 }
 950         }
 951
 952         for (i = 0; i < 2; i++) {
 953                 /*
 954                  * we must recalibrate twice, just in case the
 955                  * heads have been beyond cylinder 76, since most
 956                  * FDCs still barf when attempting to recalibrate
 957                  * more than 77 steps
 958                  */
 959                 /* go back to 0: */
 960                 if (fd_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
 961                         /* a second being enough for full stroke seek*/
 962                         DELAY(i == 0 ? 1000000 : 300000);
 963
 964                         /* anything responding? */
 965                         if (fd_sense_int(fdc, &st0, 0) == 0 &&
 966                             (st0 & NE7_ST0_EC) == 0)
 967                                 break; /* already probed succesfully */
 968                 }
 969         }
 970
 971         set_motor(fdc, fdsu, TURNOFF);
 972
 973         if (st0 & NE7_ST0_EC) /* no track 0 -> no drive present */
 974                 return (ENXIO);
 975
 976         fd->track = FD_NO_TRACK;
 977         fd->fdc = fdc;
 978         fd->fdsu = fdsu;
 979         fd->options = 0;
 980         callout_init(&fd->toffhandle);
 981         callout_init(&fd->tohandle);
 982         callout_init(&fd->motor);
 983
 984         switch (fdt) {
 985         case RTCFDT_12M:
 986                 device_set_desc(dev, "1200-KB 5.25\" drive");
 987                 fd->type = FD_1200;
 988                 break;
 989         case RTCFDT_144M | RTCFDT_144M_PRETENDED:
 990                 device_set_desc(dev, "config-pretended 1440-MB 3.5\" drive");
 991                 fdt = RTCFDT_144M;
 992                 fd->type = FD_1440;
 993         case RTCFDT_144M:
 994                 device_set_desc(dev, "1440-KB 3.5\" drive");
 995                 fd->type = FD_1440;
 996                 break;
 997         case RTCFDT_288M:
 998         case RTCFDT_288M_1:
 999                 device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
1000                 fd->type = FD_1440;
1001                 break;
1002         case RTCFDT_360K:
1003                 device_set_desc(dev, "360-KB 5.25\" drive");
1004                 fd->type = FD_360;
1005                 break;
1006         case RTCFDT_720K:
1007                 printf("720-KB 3.5\" drive");
1008                 fd->type = FD_720;
1009                 break;
1010         default:
1011                 return (ENXIO);
1012         }
1013         return (0);
1014 }
1015
1016 static int
1017 fd_attach(device_t dev)
1018 {
1019         struct  fd_data *fd;
1020 #if 0
1021         int     i;
1022         int     mynor;
1023         int     typemynor;
1024         int     typesize;
1025 #endif
1026
1027         fd = device_get_softc(dev);
1028
1029         cdevsw_add(&fd_cdevsw, -1 << 6, fd->fdu << 6);
1030         make_dev(&fd_cdevsw, (fd->fdu << 6),
1031                 UID_ROOT, GID_OPERATOR, 0640, "rfd%d", fd->fdu);
1032
1033 #if 0
1034         /* Other make_dev() go here. */
1035 #endif
1036
1037         /*
1038          * Export the drive to the devstat interface.
1039          */
1040         devstat_add_entry(&fd->device_stats, device_get_name(dev),
1041                           device_get_unit(dev), 512, DEVSTAT_NO_ORDERED_TAGS,
1042                           DEVSTAT_TYPE_FLOPPY | DEVSTAT_TYPE_IF_OTHER,
1043                           DEVSTAT_PRIORITY_FD);
1044         return (0);
1045 }
1046
1047 static int
1048 fd_detach(device_t dev)
1049 {
1050         struct  fd_data *fd;
1051
1052         fd = device_get_softc(dev);
1053         callout_stop(&fd->toffhandle);
1054         callout_stop(&fd->motor);
1055
1056         return (0);
1057 }
1058
1059 static device_method_t fd_methods[] = {
1060         /* Device interface */
1061         DEVMETHOD(device_probe,         fd_probe),
1062         DEVMETHOD(device_attach,        fd_attach),
1063         DEVMETHOD(device_detach,        fd_detach),
1064         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
1065         DEVMETHOD(device_suspend,       bus_generic_suspend), /* XXX */
1066         DEVMETHOD(device_resume,        bus_generic_resume), /* XXX */
1067
1068         { 0, 0 }
1069 };
1070
1071 static driver_t fd_driver = {
1072         "fd",
1073         fd_methods,
1074         sizeof(struct fd_data)
1075 };
1076
1077 DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, 0, 0);
1078
1079 /****************************************************************************/
1080 /*                            motor control stuff                           */
1081 /*              remember to not deselect the drive we're working on         */
1082 /****************************************************************************/
1083 static void
1084 set_motor(struct fdc_data *fdc, int fdsu, int turnon)
1085 {
1086         int fdout = fdc->fdout;
1087         int needspecify = 0;
1088
1089         if(turnon) {
1090                 fdout &= ~FDO_FDSEL;
1091                 fdout |= (FDO_MOEN0 << fdsu) + fdsu;
1092         } else
1093                 fdout &= ~(FDO_MOEN0 << fdsu);
1094
1095         if(!turnon
1096            && (fdout & (FDO_MOEN0+FDO_MOEN1+FDO_MOEN2+FDO_MOEN3)) == 0)
1097                 /* gonna turn off the last drive, put FDC to bed */
1098                 fdout &= ~ (FDO_FRST|FDO_FDMAEN);
1099         else {
1100                 /* make sure controller is selected and specified */
1101                 if((fdout & (FDO_FRST|FDO_FDMAEN)) == 0)
1102                         needspecify = 1;
1103                 fdout |= (FDO_FRST|FDO_FDMAEN);
1104         }
1105
1106         fdout_wr(fdc, fdout);
1107         fdc->fdout = fdout;
1108         TRACE1("[0x%x->FDOUT]", fdout);
1109
1110         if (needspecify) {
1111                 /*
1112                  * XXX
1113                  * special case: since we have just woken up the FDC
1114                  * from its sleep, we silently assume the command will
1115                  * be accepted, and do not test for a timeout
1116                  */
1117                 (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1118                              NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1119                              0);
1120                 if (fdc->flags & FDC_HAS_FIFO)
1121                         (void) enable_fifo(fdc);
1122         }
1123 }
1124
1125 static void
1126 fd_turnoff(void *xfd)
1127 {
1128         fd_p fd = xfd;
1129
1130         TRACE1("[fd%d: turnoff]", fd->fdu);
1131
1132         crit_enter();
1133         /*
1134          * Don't turn off the motor yet if the drive is active.
1135          *
1136          * If we got here, this could only mean we missed an interrupt.
1137          * This can e. g. happen on the Y-E Date PCMCIA floppy controller
1138          * after a controller reset.  Just schedule a pseudo-interrupt
1139          * so the state machine gets re-entered.
1140          */
1141         if (fd->fdc->state != DEVIDLE && fd->fdc->fdu == fd->fdu) {
1142                 fdc_intr(fd->fdc);
1143                 crit_exit();
1144                 return;
1145         }
1146
1147         fd->flags &= ~FD_MOTOR;
1148         set_motor(fd->fdc, fd->fdsu, TURNOFF);
1149         crit_exit();
1150 }
1151
1152 static void
1153 fd_motor_on(void *xfd)
1154 {
1155         fd_p fd = xfd;
1156
1157         crit_enter();
1158         fd->flags &= ~FD_MOTOR_WAIT;
1159         if((fd->fdc->fd == fd) && (fd->fdc->state == MOTORWAIT))
1160         {
1161                 fdc_intr(fd->fdc);
1162         }
1163         crit_exit();
1164 }
1165
1166 static void
1167 fd_turnon(fd_p fd)
1168 {
1169         if(!(fd->flags & FD_MOTOR))
1170         {
1171                 fd->flags |= (FD_MOTOR + FD_MOTOR_WAIT);
1172                 set_motor(fd->fdc, fd->fdsu, TURNON);
1173                 callout_reset(&fd->motor, hz, fd_motor_on, fd);
1174         }
1175 }
1176
1177 static void
1178 fdc_reset(fdc_p fdc)
1179 {
1180         /* Try a reset, keep motor on */
1181         fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1182         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1183         DELAY(100);
1184         /* enable FDC, but defer interrupts a moment */
1185         fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
1186         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~FDO_FDMAEN);
1187         DELAY(100);
1188         fdout_wr(fdc, fdc->fdout);
1189         TRACE1("[0x%x->FDOUT]", fdc->fdout);
1190
1191         /* XXX after a reset, silently believe the FDC will accept commands */
1192         (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1193                      NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1194                      0);
1195         if (fdc->flags & FDC_HAS_FIFO)
1196                 (void) enable_fifo(fdc);
1197 }
1198
1199 /****************************************************************************/
1200 /*                             fdc in/out                                   */
1201 /****************************************************************************/
1202 /*
1203  * FDC IO functions, take care of the main status register, timeout
1204  * in case the desired status bits are never set.
1205  *
1206  * These PIO loops initially start out with short delays between
1207  * each iteration in the expectation that the required condition
1208  * is usually met quickly, so it can be handled immediately.  After
1209  * about 1 ms, stepping is increased to achieve a better timing
1210  * accuracy in the calls to DELAY().
1211  */
1212 static int
1213 fd_in(struct fdc_data *fdc, int *ptr)
1214 {
1215         int i, j, step;
1216
1217         for (j = 0, step = 1;
1218             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != (NE7_DIO|NE7_RQM) &&
1219             j < FDSTS_TIMEOUT;
1220             j += step) {
1221                 if (i == NE7_RQM)
1222                         return (fdc_err(fdc, "ready for output in input\n"));
1223                 if (j == 1000)
1224                         step = 1000;
1225                 DELAY(step);
1226         }
1227         if (j >= FDSTS_TIMEOUT)
1228                 return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
1229 #ifdef  FDC_DEBUG
1230         i = fddata_rd(fdc);
1231         TRACE1("[FDDATA->0x%x]", (unsigned char)i);
1232         *ptr = i;
1233         return (0);
1234 #else   /* !FDC_DEBUG */
1235         i = fddata_rd(fdc);
1236         if (ptr)
1237                 *ptr = i;
1238         return (0);
1239 #endif  /* FDC_DEBUG */
1240 }
1241
1242 static int
1243 out_fdc(struct fdc_data *fdc, int x)
1244 {
1245         int i, j, step;
1246
1247         for (j = 0, step = 1;
1248             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != NE7_RQM &&
1249             j < FDSTS_TIMEOUT;
1250             j += step) {
1251                 if (i == (NE7_DIO|NE7_RQM))
1252                         return (fdc_err(fdc, "ready for input in output\n"));
1253                 if (j == 1000)
1254                         step = 1000;
1255                 DELAY(step);
1256         }
1257         if (j >= FDSTS_TIMEOUT)
1258                 return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
1259
1260         /* Send the command and return */
1261         fddata_wr(fdc, x);
1262         TRACE1("[0x%x->FDDATA]", x);
1263         return (0);
1264 }
1265
1266 /****************************************************************************/
1267 /*                           fdopen/fdclose                                 */
1268 /****************************************************************************/
1269 int
1270 Fdopen(dev_t dev, int flags, int mode, struct thread *td)
1271 {
1272         fdu_t fdu = FDUNIT(minor(dev));
1273         int type = FDTYPE(minor(dev));
1274         fd_p    fd;
1275         fdc_p   fdc;
1276
1277         /* check bounds */
1278         if ((fd = devclass_get_softc(fd_devclass, fdu)) == 0)
1279                 return (ENXIO);
1280         fdc = fd->fdc;
1281         if ((fdc == NULL) || (fd->type == NO_TYPE))
1282                 return (ENXIO);
1283         if (type > NUMDENS)
1284                 return (ENXIO);
1285         if (type == 0)
1286                 type = fd->type;
1287         else {
1288                 /*
1289                  * For each type of basic drive, make sure we are trying
1290                  * to open a type it can do,
1291                  */
1292                 if (type != fd->type) {
1293                         switch (fd->type) {
1294                         case FD_360:
1295                                 return (ENXIO);
1296                         case FD_720:
1297                                 if (   type != FD_820
1298                                     && type != FD_800
1299                                     && type != FD_640
1300                                    )
1301                                         return (ENXIO);
1302                                 break;
1303                         case FD_1200:
1304                                 switch (type) {
1305                                 case FD_1480:
1306                                         type = FD_1480in5_25;
1307                                         break;
1308                                 case FD_1440:
1309                                         type = FD_1440in5_25;
1310                                         break;
1311                                 case FD_1232:
1312                                         break;
1313                                 case FD_820:
1314                                         type = FD_820in5_25;
1315                                         break;
1316                                 case FD_800:
1317                                         type = FD_800in5_25;
1318                                         break;
1319                                 case FD_720:
1320                                         type = FD_720in5_25;
1321                                         break;
1322                                 case FD_640:
1323                                         type = FD_640in5_25;
1324                                         break;
1325                                 case FD_360:
1326                                         type = FD_360in5_25;
1327                                         break;
1328                                 default:
1329                                         return(ENXIO);
1330                                 }
1331                                 break;
1332                         case FD_1440:
1333                                 if (   type != FD_1720
1334                                     && type != FD_1480
1335                                     && type != FD_1200
1336                                     && type != FD_820
1337                                     && type != FD_800
1338                                     && type != FD_720
1339                                     && type != FD_640
1340                                     )
1341                                         return(ENXIO);
1342                                 break;
1343                         }
1344                 }
1345         }
1346         fd->ft = fd_types + type - 1;
1347         fd->flags |= FD_OPEN;
1348         /*
1349          * Clearing the DMA overrun counter at open time is a bit messy.
1350          * Since we're only managing one counter per controller, opening
1351          * the second drive could mess it up.  Anyway, if the DMA overrun
1352          * condition is really persistent, it will eventually time out
1353          * still.  OTOH, clearing it here will ensure we'll at least start
1354          * trying again after a previous (maybe even long ago) failure.
1355          * Also, this is merely a stop-gap measure only that should not
1356          * happen during normal operation, so we can tolerate it to be a
1357          * bit sloppy about this.
1358          */
1359         fdc->dma_overruns = 0;
1360
1361         return 0;
1362 }
1363
1364 int
1365 fdclose(dev_t dev, int flags, int mode, struct thread *td)
1366 {
1367         fdu_t fdu = FDUNIT(minor(dev));
1368         struct fd_data *fd;
1369
1370         fd = devclass_get_softc(fd_devclass, fdu);
1371         fd->flags &= ~FD_OPEN;
1372         fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG);
1373
1374         return (0);
1375 }
1376
1377 /****************************************************************************/
1378 /*                               fdstrategy                                 */
1379 /****************************************************************************/
1380 void
1381 fdstrategy(dev_t dev, struct bio *bio)
1382 {
1383         struct buf *bp = bio->bio_buf;
1384         unsigned nblocks, blknum, cando;
1385         fdu_t   fdu;
1386         fdc_p   fdc;
1387         fd_p    fd;
1388         size_t  fdblk;
1389
1390         fdu = FDUNIT(minor(dev));
1391         fd = devclass_get_softc(fd_devclass, fdu);
1392         if (fd == 0)
1393                 panic("fdstrategy: buf for nonexistent device (%#lx, %#lx)",
1394                       (u_long)major(dev), (u_long)minor(dev));
1395         fdc = fd->fdc;
1396         if (fd->type == NO_TYPE) {
1397                 bp->b_error = ENXIO;
1398                 bp->b_flags |= B_ERROR;
1399                 goto bad;
1400         };
1401
1402         fdblk = 128 << (fd->ft->secsize);
1403         if (bp->b_cmd != BUF_CMD_FORMAT) {
1404                 if (bio->bio_offset < 0) {
1405                         printf(
1406                 "fd%d: fdstrat: bad request offset = %lld, bcount = %d\n",
1407                                fdu, bio->bio_offset, bp->b_bcount);
1408                         bp->b_error = EINVAL;
1409                         bp->b_flags |= B_ERROR;
1410                         goto bad;
1411                 }
1412                 if ((bp->b_bcount % fdblk) != 0) {
1413                         bp->b_error = EINVAL;
1414                         bp->b_flags |= B_ERROR;
1415                         goto bad;
1416                 }
1417         }
1418
1419         /*
1420          * Set up block calculations.
1421          */
1422         if (bio->bio_offset > 20000000LL * fdblk) {
1423                 /*
1424                  * Reject unreasonably high block number, prevent the
1425                  * multiplication below from overflowing.
1426                  */
1427                 bp->b_error = EINVAL;
1428                 bp->b_flags |= B_ERROR;
1429                 goto bad;
1430         }
1431         blknum = (unsigned)(bio->bio_offset / fdblk);
1432         nblocks = fd->ft->size;
1433         bp->b_resid = 0;
1434         if (blknum + (bp->b_bcount / fdblk) > nblocks) {
1435                 if (blknum <= nblocks) {
1436                         cando = (nblocks - blknum) * fdblk;
1437                         bp->b_resid = bp->b_bcount - cando;
1438                         if (cando == 0)
1439                                 goto bad;       /* not actually bad but EOF */
1440                 } else {
1441                         bp->b_error = EINVAL;
1442                         bp->b_flags |= B_ERROR;
1443                         goto bad;
1444                 }
1445         }
1446         crit_enter();
1447         bio->bio_driver_info = dev;
1448         bioqdisksort(&fdc->bio_queue, bio);
1449         callout_stop(&fd->toffhandle);
1450
1451         /* Tell devstat we are starting on the transaction */
1452         devstat_start_transaction(&fd->device_stats);
1453         device_busy(fd->dev);
1454
1455         fdstart(fdc);
1456         crit_exit();
1457         return;
1458
1459 bad:
1460         biodone(bio);
1461 }
1462
1463 /***************************************************************\
1464 *                               fdstart                         *
1465 * We have just queued something.. if the controller is not busy *
1466 * then simulate the case where it has just finished a command   *
1467 * So that it (the interrupt routine) looks on the queue for more*
1468 * work to do and picks up what we just added.                   *
1469 * If the controller is already busy, we need do nothing, as it  *
1470 * will pick up our work when the present work completes         *
1471 \***************************************************************/
1472 static void
1473 fdstart(struct fdc_data *fdc)
1474 {
1475         crit_enter();
1476         if(fdc->state == DEVIDLE)
1477         {
1478                 fdc_intr(fdc);
1479         }
1480         crit_exit();
1481 }
1482
1483 static void
1484 fd_iotimeout(void *xfdc)
1485 {
1486         fdc_p fdc;
1487
1488         fdc = xfdc;
1489         TRACE1("fd%d[fd_iotimeout()]", fdc->fdu);
1490
1491         /*
1492          * Due to IBM's brain-dead design, the FDC has a faked ready
1493          * signal, hardwired to ready == true. Thus, any command
1494          * issued if there's no diskette in the drive will _never_
1495          * complete, and must be aborted by resetting the FDC.
1496          * Many thanks, Big Blue!
1497          * The FDC must not be reset directly, since that would
1498          * interfere with the state machine.  Instead, pretend that
1499          * the command completed but was invalid.  The state machine
1500          * will reset the FDC and retry once.
1501          */
1502         crit_enter();
1503         fdc->status[0] = NE7_ST0_IC_IV;
1504         fdc->flags &= ~FDC_STAT_VALID;
1505         fdc->state = IOTIMEDOUT;
1506         fdc_intr(fdc);
1507         crit_exit();
1508 }
1509
1510 /* just ensure it is running in a critical section */
1511 static void
1512 fd_pseudointr(void *xfdc)
1513 {
1514         crit_enter();
1515         fdc_intr(xfdc);
1516         crit_exit();
1517 }
1518
1519 /***********************************************************************\
1520 *                                 fdintr                                *
1521 * keep calling the state machine until it returns a 0                   *
1522 * ALWAYS called at SPLBIO                                               *
1523 \***********************************************************************/
1524 static void
1525 fdc_intr(void *xfdc)
1526 {
1527         fdc_p fdc = xfdc;
1528         while(fdstate(fdc))
1529                 ;
1530 }
1531
1532 /*
1533  * magic pseudo-DMA initialization for YE FDC. Sets count and
1534  * direction
1535  */
1536 #define SET_BCDR(fdc,wr,cnt,port) \
1537         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port,  \
1538             ((cnt)-1) & 0xff);                                           \
1539         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port + 1, \
1540             ((wr ? 0x80 : 0) | ((((cnt)-1) >> 8) & 0x7f)));
1541
1542 /*
1543  * fdcpio(): perform programmed IO read/write for YE PCMCIA floppy
1544  */
1545 static int fdcpio(fdc_p fdc, buf_cmd_t cmd, caddr_t addr, u_int count)
1546 {
1547         u_char *cptr = (u_char *)addr;
1548
1549         if (cmd == BUF_CMD_READ) {
1550                 if (fdc->state != PIOREAD) {
1551                         fdc->state = PIOREAD;
1552                         return(0);
1553                 };
1554                 SET_BCDR(fdc, 0, count, 0);
1555                 bus_space_read_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1556                     FDC_YE_DATAPORT, cptr, count);
1557         } else {
1558                 bus_space_write_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1559                     FDC_YE_DATAPORT, cptr, count);
1560                 SET_BCDR(fdc, 0, count, 0);
1561         };
1562         return(1);
1563 }
1564
1565 /***********************************************************************\
1566 * The controller state machine.                                         *
1567 * if it returns a non zero value, it should be called again immediatly  *
1568 \***********************************************************************/
1569 static int
1570 fdstate(fdc_p fdc)
1571 {
1572         int read, format, head, i, sec = 0, sectrac, st0, cyl, st3;
1573         unsigned blknum = 0, b_cylinder = 0;
1574         fdu_t fdu = fdc->fdu;
1575         fd_p fd;
1576         struct bio *bio;
1577         struct buf *bp;
1578         struct fd_formb *finfo = NULL;
1579         size_t fdblk;
1580         dev_t dev;
1581
1582         bio = fdc->bio;
1583         if (bio == NULL) {
1584                 bio = bioq_first(&fdc->bio_queue);
1585                 if (bio != NULL) {
1586                         bioq_remove(&fdc->bio_queue, bio);
1587                         fdc->bio = bio;
1588                 }
1589         }
1590         if (bio == NULL) {
1591                 /***********************************************\
1592                 * nothing left for this controller to do        *
1593                 * Force into the IDLE state,                    *
1594                 \***********************************************/
1595                 fdc->state = DEVIDLE;
1596                 if (fdc->fd) {
1597                         device_printf(fdc->fdc_dev,
1598                             "unexpected valid fd pointer\n");
1599                         fdc->fd = (fd_p) 0;
1600                         fdc->fdu = -1;
1601                 }
1602                 TRACE1("[fdc%d IDLE]", fdc->fdcu);
1603                 return (0);
1604         }
1605         bp = bio->bio_buf;
1606         dev = bio->bio_driver_info;
1607
1608         fdu = FDUNIT(minor(dev));
1609         fd = devclass_get_softc(fd_devclass, fdu);
1610         fdblk = 128 << fd->ft->secsize;
1611         if (fdc->fd && (fd != fdc->fd))
1612                 device_printf(fd->dev, "confused fd pointers\n");
1613         read = (bp->b_cmd == BUF_CMD_READ);
1614         format = (bp->b_cmd == BUF_CMD_FORMAT);
1615         if (format) {
1616                 finfo = (struct fd_formb *)bp->b_data;
1617                 fd->skip = (char *)&(finfo->fd_formb_cylno(0))
1618                         - (char *)finfo;
1619         }
1620         if (fdc->state == DOSEEK || fdc->state == SEEKCOMPLETE) {
1621                 blknum = (unsigned)(bio->bio_offset / fdblk) +
1622                          fd->skip  /fdblk;
1623                 b_cylinder = blknum / (fd->ft->sectrac * fd->ft->heads);
1624         }
1625         TRACE1("fd%d", fdu);
1626         TRACE1("[%s]", fdstates[fdc->state]);
1627         TRACE1("(0x%x)", fd->flags);
1628         callout_reset(&fd->toffhandle, 4 * hz, fd_turnoff, fd);
1629         switch (fdc->state)
1630         {
1631         case DEVIDLE:
1632         case FINDWORK:  /* we have found new work */
1633                 fdc->retry = 0;
1634                 fd->skip = 0;
1635                 fdc->fd = fd;
1636                 fdc->fdu = fdu;
1637                 fdc->fdctl_wr(fdc, fd->ft->trans);
1638                 TRACE1("[0x%x->FDCTL]", fd->ft->trans);
1639                 /*******************************************************\
1640                 * If the next drive has a motor startup pending, then   *
1641                 * it will start up in its own good time         *
1642                 \*******************************************************/
1643                 if(fd->flags & FD_MOTOR_WAIT) {
1644                         fdc->state = MOTORWAIT;
1645                         return (0); /* come back later */
1646                 }
1647                 /*******************************************************\
1648                 * Maybe if it's not starting, it SHOULD be starting     *
1649                 \*******************************************************/
1650                 if (!(fd->flags & FD_MOTOR))
1651                 {
1652                         fdc->state = MOTORWAIT;
1653                         fd_turnon(fd);
1654                         return (0);
1655                 }
1656                 else    /* at least make sure we are selected */
1657                 {
1658                         set_motor(fdc, fd->fdsu, TURNON);
1659                 }
1660                 if (fdc->flags & FDC_NEEDS_RESET) {
1661                         fdc->state = RESETCTLR;
1662                         fdc->flags &= ~FDC_NEEDS_RESET;
1663                 } else
1664                         fdc->state = DOSEEK;
1665                 break;
1666         case DOSEEK:
1667                 if (b_cylinder == (unsigned)fd->track)
1668                 {
1669                         fdc->state = SEEKCOMPLETE;
1670                         break;
1671                 }
1672                 if (fd_cmd(fdc, 3, NE7CMD_SEEK,
1673                            fd->fdsu, b_cylinder * fd->ft->steptrac,
1674                            0))
1675                 {
1676                         /*
1677                          * seek command not accepted, looks like
1678                          * the FDC went off to the Saints...
1679                          */
1680                         fdc->retry = 6; /* try a reset */
1681                         return(retrier(fdc));
1682                 }
1683                 fd->track = FD_NO_TRACK;
1684                 fdc->state = SEEKWAIT;
1685                 return(0);      /* will return later */
1686         case SEEKWAIT:
1687                 /* allow heads to settle */
1688                 callout_reset(&fdc->pseudointr_ch, hz / 16,
1689                                fd_pseudointr, fdc);
1690                 fdc->state = SEEKCOMPLETE;
1691                 return(0);      /* will return later */
1692         case SEEKCOMPLETE : /* SEEK DONE, START DMA */
1693                 /* Make sure seek really happened*/
1694                 if(fd->track == FD_NO_TRACK) {
1695                         int descyl = b_cylinder * fd->ft->steptrac;
1696                         do {
1697                                 /*
1698                                  * This might be a "ready changed" interrupt,
1699                                  * which cannot really happen since the
1700                                  * RDY pin is hardwired to + 5 volts.  This
1701                                  * generally indicates a "bouncing" intr
1702                                  * line, so do one of the following:
1703                                  *
1704                                  * When running on an enhanced FDC that is
1705                                  * known to not go stuck after responding
1706                                  * with INVALID, fetch all interrupt states
1707                                  * until seeing either an INVALID or a
1708                                  * real interrupt condition.
1709                                  *
1710                                  * When running on a dumb old NE765, give
1711                                  * up immediately.  The controller will
1712                                  * provide up to four dummy RC interrupt
1713                                  * conditions right after reset (for the
1714                                  * corresponding four drives), so this is
1715                                  * our only chance to get notice that it
1716                                  * was not the FDC that caused the interrupt.
1717                                  */
1718                                 if (fd_sense_int(fdc, &st0, &cyl)
1719                                     == FD_NOT_VALID)
1720                                         return 0;
1721                                 if(fdc->fdct == FDC_NE765
1722                                    && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
1723                                         return 0; /* hope for a real intr */
1724                         } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
1725
1726                         if (0 == descyl) {
1727                                 int failed = 0;
1728                                 /*
1729                                  * seek to cyl 0 requested; make sure we are
1730                                  * really there
1731                                  */
1732                                 if (fd_sense_drive_status(fdc, &st3))
1733                                         failed = 1;
1734                                 if ((st3 & NE7_ST3_T0) == 0) {
1735                                         printf(
1736                 "fd%d: Seek to cyl 0, but not really there (ST3 = %b)\n",
1737                                                fdu, st3, NE7_ST3BITS);
1738                                         failed = 1;
1739                                 }
1740
1741                                 if (failed) {
1742                                         if(fdc->retry < 3)
1743                                                 fdc->retry = 3;
1744                                         return (retrier(fdc));
1745                                 }
1746                         }
1747
1748                         if (cyl != descyl) {
1749                                 printf(
1750                 "fd%d: Seek to cyl %d failed; am at cyl %d (ST0 = 0x%x)\n",
1751                                        fdu, descyl, cyl, st0);
1752                                 if (fdc->retry < 3)
1753                                         fdc->retry = 3;
1754                                 return (retrier(fdc));
1755                         }
1756                 }
1757
1758                 fd->track = b_cylinder;
1759                 if (!(fdc->flags & FDC_NODMA)) {
1760                         isa_dmastart(isa_dmabp(bp),
1761                                      bp->b_data+fd->skip,
1762                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1763                 }
1764                 sectrac = fd->ft->sectrac;
1765                 sec = blknum %  (sectrac * fd->ft->heads);
1766                 head = sec / sectrac;
1767                 sec = sec % sectrac + 1;
1768                 fd->hddrv = ((head&1)<<2)+fdu;
1769
1770                 if(format || !read)
1771                 {
1772                         /* make sure the drive is writable */
1773                         if(fd_sense_drive_status(fdc, &st3) != 0)
1774                         {
1775                                 /* stuck controller? */
1776                                 if (!(fdc->flags & FDC_NODMA))
1777                                         isa_dmadone(isa_dmabp(bp),
1778                                                     bp->b_data + fd->skip,
1779                                                     format ? bp->b_bcount : fdblk,
1780                                                     fdc->dmachan);
1781                                 fdc->retry = 6; /* reset the beast */
1782                                 return (retrier(fdc));
1783                         }
1784                         if(st3 & NE7_ST3_WP)
1785                         {
1786                                 /*
1787                                  * XXX YES! this is ugly.
1788                                  * in order to force the current operation
1789                                  * to fail, we will have to fake an FDC
1790                                  * error - all error handling is done
1791                                  * by the retrier()
1792                                  */
1793                                 fdc->status[0] = NE7_ST0_IC_AT;
1794                                 fdc->status[1] = NE7_ST1_NW;
1795                                 fdc->status[2] = 0;
1796                                 fdc->status[3] = fd->track;
1797                                 fdc->status[4] = head;
1798                                 fdc->status[5] = sec;
1799                                 fdc->retry = 8; /* break out immediately */
1800                                 fdc->state = IOTIMEDOUT; /* not really... */
1801                                 return (1);
1802                         }
1803                 }
1804
1805                 if (format) {
1806                         if (fdc->flags & FDC_NODMA) {
1807                                 /*
1808                                  * This seems to be necessary for
1809                                  * whatever obscure reason; if we omit
1810                                  * it, we end up filling the sector ID
1811                                  * fields of the newly formatted track
1812                                  * entirely with garbage, causing
1813                                  * `wrong cylinder' errors all over
1814                                  * the place when trying to read them
1815                                  * back.
1816                                  *
1817                                  * Umpf.
1818                                  */
1819                                 SET_BCDR(fdc, 1, bp->b_bcount, 0);
1820
1821                                 (void)fdcpio(fdc,bp->b_cmd,
1822                                         bp->b_data+fd->skip,
1823                                         bp->b_bcount);
1824
1825                         }
1826                         /* formatting */
1827                         if(fd_cmd(fdc, 6,  NE7CMD_FORMAT, head << 2 | fdu,
1828                                   finfo->fd_formb_secshift,
1829                                   finfo->fd_formb_nsecs,
1830                                   finfo->fd_formb_gaplen,
1831                                   finfo->fd_formb_fillbyte, 0)) {
1832                                 /* controller fell over */
1833                                 if (!(fdc->flags & FDC_NODMA))
1834                                         isa_dmadone(isa_dmabp(bp),
1835                                                     bp->b_data + fd->skip,
1836                                                     format ? bp->b_bcount : fdblk,
1837                                                     fdc->dmachan);
1838                                 fdc->retry = 6;
1839                                 return (retrier(fdc));
1840                         }
1841                 } else {
1842                         if (fdc->flags & FDC_NODMA) {
1843                                 /*
1844                                  * this seems to be necessary even when
1845                                  * reading data
1846                                  */
1847                                 SET_BCDR(fdc, 1, fdblk, 0);
1848
1849                                 /*
1850                                  * perform the write pseudo-DMA before
1851                                  * the WRITE command is sent
1852                                  */
1853                                 if (!read)
1854                                         (void)fdcpio(fdc,bp->b_cmd,
1855                                             bp->b_data+fd->skip,
1856                                             fdblk);
1857                         }
1858                         if (fd_cmd(fdc, 9,
1859                                    (read ? NE7CMD_READ : NE7CMD_WRITE),
1860                                    head << 2 | fdu,  /* head & unit */
1861                                    fd->track,        /* track */
1862                                    head,
1863                                    sec,              /* sector + 1 */
1864                                    fd->ft->secsize,  /* sector size */
1865                                    sectrac,          /* sectors/track */
1866                                    fd->ft->gap,      /* gap size */
1867                                    fd->ft->datalen,  /* data length */
1868                                    0)) {
1869                                 /* the beast is sleeping again */
1870                                 if (!(fdc->flags & FDC_NODMA))
1871                                         isa_dmadone(isa_dmabp(bp),
1872                                                     bp->b_data + fd->skip,
1873                                                     format ? bp->b_bcount : fdblk,
1874                                                     fdc->dmachan);
1875                                 fdc->retry = 6;
1876                                 return (retrier(fdc));
1877                         }
1878                 }
1879                 if (fdc->flags & FDC_NODMA)
1880                         /*
1881                          * if this is a read, then simply await interrupt
1882                          * before performing PIO
1883                          */
1884                         if (read && !fdcpio(fdc,bp->b_cmd,
1885                             bp->b_data+fd->skip,fdblk)) {
1886                                 callout_reset(&fd->tohandle, hz,
1887                                                 fd_iotimeout, fdc);
1888                                 return(0);      /* will return later */
1889                         };
1890
1891                 /*
1892                  * write (or format) operation will fall through and
1893                  * await completion interrupt
1894                  */
1895                 fdc->state = IOCOMPLETE;
1896                 callout_reset(&fd->tohandle, hz, fd_iotimeout, fdc);
1897                 return (0);     /* will return later */
1898         case PIOREAD:
1899                 /*
1900                  * actually perform the PIO read.  The IOCOMPLETE case
1901                  * removes the timeout for us.
1902                  */
1903                 (void)fdcpio(fdc,bp->b_cmd,bp->b_data+fd->skip,fdblk);
1904                 fdc->state = IOCOMPLETE;
1905                 /* FALLTHROUGH */
1906         case IOCOMPLETE: /* IO DONE, post-analyze */
1907                 callout_stop(&fd->tohandle);
1908
1909                 if (fd_read_status(fdc, fd->fdsu)) {
1910                         if (!(fdc->flags & FDC_NODMA)) {
1911                                 isa_dmadone(isa_dmabp(bp),
1912                                             bp->b_data + fd->skip,
1913                                             format ? bp->b_bcount : fdblk,
1914                                             fdc->dmachan);
1915                         }
1916                         if (fdc->retry < 6)
1917                                 fdc->retry = 6; /* force a reset */
1918                         return (retrier(fdc));
1919                 }
1920
1921                 fdc->state = IOTIMEDOUT;
1922
1923                 /* FALLTHROUGH */
1924
1925         case IOTIMEDOUT:
1926                 if (!(fdc->flags & FDC_NODMA)) {
1927                         isa_dmadone(isa_dmabp(bp),
1928                                     bp->b_data + fd->skip,
1929                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1930                 }
1931                 if (fdc->status[0] & NE7_ST0_IC) {
1932                         if ((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1933                             && fdc->status[1] & NE7_ST1_OR) {
1934                                 /*
1935                                  * DMA overrun. Someone hogged the bus and
1936                                  * didn't release it in time for the next
1937                                  * FDC transfer.
1938                                  *
1939                                  * We normally restart this without bumping
1940                                  * the retry counter.  However, in case
1941                                  * something is seriously messed up (like
1942                                  * broken hardware), we rather limit the
1943                                  * number of retries so the IO operation
1944                                  * doesn't block indefinately.
1945                                  */
1946                                 if (fdc->dma_overruns++ < FDC_DMAOV_MAX) {
1947                                         fdc->state = SEEKCOMPLETE;
1948                                         return (1);
1949                                 } /* else fall through */
1950                         }
1951                         if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_IV
1952                                 && fdc->retry < 6)
1953                                 fdc->retry = 6; /* force a reset */
1954                         else if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1955                                 && fdc->status[2] & NE7_ST2_WC
1956                                 && fdc->retry < 3)
1957                                 fdc->retry = 3; /* force recalibrate */
1958                         return (retrier(fdc));
1959                 }
1960                 /* All OK */
1961                 /* Operation successful, retry DMA overruns again next time. */
1962                 fdc->dma_overruns = 0;
1963                 fd->skip += fdblk;
1964                 if (!format && fd->skip < bp->b_bcount - bp->b_resid) {
1965                         /* set up next transfer */
1966                         fdc->state = DOSEEK;
1967                 } else {
1968                         /* ALL DONE */
1969                         fd->skip = 0;
1970                         fdc->bio = NULL;
1971                         device_unbusy(fd->dev);
1972                         devstat_end_transaction_buf(&fd->device_stats, bp);
1973                         biodone(bio);
1974                         fdc->fd = (fd_p) 0;
1975                         fdc->fdu = -1;
1976                         fdc->state = FINDWORK;
1977                 }
1978                 return (1);
1979         case RESETCTLR:
1980                 fdc_reset(fdc);
1981                 fdc->retry++;
1982                 fdc->state = RESETCOMPLETE;
1983                 return (0);
1984         case RESETCOMPLETE:
1985                 /*
1986                  * Discard all the results from the reset so that they
1987                  * can't cause an unexpected interrupt later.
1988                  */
1989                 for (i = 0; i < 4; i++)
1990                         (void)fd_sense_int(fdc, &st0, &cyl);
1991                 fdc->state = STARTRECAL;
1992                 /* Fall through. */
1993         case STARTRECAL:
1994                 if(fd_cmd(fdc, 2, NE7CMD_RECAL, fdu, 0)) {
1995                         /* arrgl */
1996                         fdc->retry = 6;
1997                         return (retrier(fdc));
1998                 }
1999                 fdc->state = RECALWAIT;
2000                 return (0);     /* will return later */
2001         case RECALWAIT:
2002                 /* allow heads to settle */
2003                 callout_reset(&fdc->pseudointr_ch, hz / 8, fd_pseudointr, fdc);
2004                 fdc->state = RECALCOMPLETE;
2005                 return (0);     /* will return later */
2006         case RECALCOMPLETE:
2007                 do {
2008                         /*
2009                          * See SEEKCOMPLETE for a comment on this:
2010                          */
2011                         if (fd_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
2012                                 return 0;
2013                         if(fdc->fdct == FDC_NE765
2014                            && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
2015                                 return 0; /* hope for a real intr */
2016                 } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
2017                 if ((st0 & NE7_ST0_IC) != NE7_ST0_IC_NT || cyl != 0)
2018                 {
2019                         if(fdc->retry > 3)
2020                                 /*
2021                                  * a recalibrate from beyond cylinder 77
2022                                  * will "fail" due to the FDC limitations;
2023                                  * since people used to complain much about
2024                                  * the failure message, try not logging
2025                                  * this one if it seems to be the first
2026                                  * time in a line
2027                                  */
2028                                 printf("fd%d: recal failed ST0 %b cyl %d\n",
2029                                        fdu, st0, NE7_ST0BITS, cyl);
2030                         if(fdc->retry < 3) fdc->retry = 3;
2031                         return (retrier(fdc));
2032                 }
2033                 fd->track = 0;
2034                 /* Seek (probably) necessary */
2035                 fdc->state = DOSEEK;
2036                 return (1);     /* will return immediatly */
2037         case MOTORWAIT:
2038                 if(fd->flags & FD_MOTOR_WAIT)
2039                 {
2040                         return (0); /* time's not up yet */
2041                 }
2042                 if (fdc->flags & FDC_NEEDS_RESET) {
2043                         fdc->state = RESETCTLR;
2044                         fdc->flags &= ~FDC_NEEDS_RESET;
2045                 } else {
2046                         /*
2047                          * If all motors were off, then the controller was
2048                          * reset, so it has lost track of the current
2049                          * cylinder.  Recalibrate to handle this case.
2050                          * But first, discard the results of the reset.
2051                          */
2052                         fdc->state = RESETCOMPLETE;
2053                 }
2054                 return (1);     /* will return immediatly */
2055         default:
2056                 device_printf(fdc->fdc_dev, "unexpected FD int->");
2057                 if (fd_read_status(fdc, fd->fdsu) == 0)
2058                         printf("FDC status :%x %x %x %x %x %x %x   ",
2059                                fdc->status[0],
2060                                fdc->status[1],
2061                                fdc->status[2],
2062                                fdc->status[3],
2063                                fdc->status[4],
2064                                fdc->status[5],
2065                                fdc->status[6] );
2066                 else
2067                         printf("No status available   ");
2068                 if (fd_sense_int(fdc, &st0, &cyl) != 0)
2069                 {
2070                         printf("[controller is dead now]\n");
2071                         return (0);
2072                 }
2073                 printf("ST0 = %x, PCN = %x\n", st0, cyl);
2074                 return (0);
2075         }
2076         /*XXX confusing: some branches return immediately, others end up here*/
2077         return (1); /* Come back immediatly to new state */
2078 }
2079
2080 static int
2081 retrier(struct fdc_data *fdc)
2082 {
2083         struct bio *bio;
2084         struct buf *bp;
2085         struct fd_data *fd;
2086         dev_t dev;
2087         int fdu;
2088
2089         bio = fdc->bio;
2090         bp = bio->bio_buf;
2091         dev = bio->bio_driver_info;
2092
2093         /* XXX shouldn't this be cached somewhere?  */
2094         fdu = FDUNIT(minor(dev));
2095         fd = devclass_get_softc(fd_devclass, fdu);
2096         if (fd->options & FDOPT_NORETRY)
2097                 goto fail;
2098
2099         switch (fdc->retry) {
2100         case 0: case 1: case 2:
2101                 fdc->state = SEEKCOMPLETE;
2102                 break;
2103         case 3: case 4: case 5:
2104                 fdc->state = STARTRECAL;
2105                 break;
2106         case 6:
2107                 fdc->state = RESETCTLR;
2108                 break;
2109         case 7:
2110                 break;
2111         default:
2112         fail:
2113                 {
2114                         int printerror = (fd->options & FDOPT_NOERRLOG) == 0;
2115
2116                         if (printerror) {
2117                                 /*
2118                                  * note: use the correct device for more
2119                                  * verbose error reporting.
2120                                  */
2121                                 dev_t subdev;
2122
2123                                 subdev = make_sub_dev(dev,
2124                                     (FDUNIT(minor(dev))<<3)|RAW_PART);
2125                                 diskerr(bio, subdev,
2126                                         "hard error", LOG_PRINTF,
2127                                         fdc->fd->skip, NULL);
2128                         }
2129                         if (printerror) {
2130                                 if (fdc->flags & FDC_STAT_VALID)
2131                                         printf(
2132                         " (ST0 %b ST1 %b ST2 %b cyl %u hd %u sec %u)\n",
2133                                                fdc->status[0], NE7_ST0BITS,
2134                                                fdc->status[1], NE7_ST1BITS,
2135                                                fdc->status[2], NE7_ST2BITS,
2136                                                fdc->status[3], fdc->status[4],
2137                                                fdc->status[5]);
2138                                 else
2139                                         printf(" (No status)\n");
2140                         }
2141                 }
2142                 bp->b_flags |= B_ERROR;
2143                 bp->b_error = EIO;
2144                 bp->b_resid += bp->b_bcount - fdc->fd->skip;
2145                 fdc->bio = NULL;
2146                 fdc->fd->skip = 0;
2147                 device_unbusy(fd->dev);
2148                 devstat_end_transaction_buf(&fdc->fd->device_stats, bp);
2149                 biodone(bio);
2150                 fdc->state = FINDWORK;
2151                 fdc->flags |= FDC_NEEDS_RESET;
2152                 fdc->fd = (fd_p) 0;
2153                 fdc->fdu = -1;
2154                 return (1);
2155         }
2156         fdc->retry++;
2157         return (1);
2158 }
2159
2160 static void
2161 fdformat_wakeup(struct bio *bio)
2162 {
2163         bio->bio_buf->b_cmd = BUF_CMD_DONE;
2164         wakeup(bio);
2165 }
2166
2167 static int
2168 fdformat(dev_t dev, struct fd_formb *finfo, struct thread *td)
2169 {
2170         fdu_t   fdu;
2171         fd_p    fd;
2172         struct buf *bp;
2173         int rv = 0;
2174         size_t fdblk;
2175
2176         fdu     = FDUNIT(minor(dev));
2177         fd      = devclass_get_softc(fd_devclass, fdu);
2178         fdblk = 128 << fd->ft->secsize;
2179
2180         /* set up a buffer header for fdstrategy() */
2181         bp = getpbuf(NULL);
2182         bp->b_cmd = BUF_CMD_FORMAT;
2183
2184         /*
2185          * calculate a fake blkno, so fdstrategy() would initiate a
2186          * seek to the requested cylinder
2187          */
2188         bp->b_bio1.bio_offset = (off_t)(finfo->cyl *
2189                 (fd->ft->sectrac * fd->ft->heads)
2190                 + finfo->head * fd->ft->sectrac) * fdblk;
2191         bp->b_bio1.bio_driver_info = dev;
2192         bp->b_bio1.bio_done = fdformat_wakeup;
2193
2194         bp->b_bcount = sizeof(struct fd_idfield_data) * finfo->fd_formb_nsecs;
2195         bp->b_data = (caddr_t)finfo;
2196
2197         /* now do the format */
2198         dev_dstrategy(dev, &bp->b_bio1);
2199
2200         /* ...and wait for it to complete */
2201         crit_enter();
2202         while (bp->b_cmd != BUF_CMD_DONE) {
2203                 rv = tsleep(&bp->b_bio1, 0, "fdform", 20 * hz);
2204                 if (rv == EWOULDBLOCK)
2205                         break;
2206         }
2207         crit_exit();
2208
2209         if (rv == EWOULDBLOCK) {
2210                 /* timed out */
2211                 rv = EIO;
2212                 device_unbusy(fd->dev);
2213                 biodone(&bp->b_bio1);
2214         }
2215         if (bp->b_flags & B_ERROR)
2216                 rv = bp->b_error;
2217         /*
2218          * allow the process to be swapped
2219          */
2220         relpbuf(bp, NULL);
2221         return rv;
2222 }
2223
2224 /*
2225  * TODO: don't allocate buffer on stack.
2226  */
2227
2228 static int
2229 fdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
2230 {
2231         fdu_t   fdu = FDUNIT(minor(dev));
2232         fd_p    fd = devclass_get_softc(fd_devclass, fdu);
2233         size_t fdblk;
2234
2235         struct fd_type *fdt;
2236         struct disklabel *dl;
2237         struct fdc_status *fsp;
2238         char buffer[DEV_BSIZE];
2239         int error = 0;
2240
2241         fdblk = 128 << fd->ft->secsize;
2242
2243         switch (cmd) {
2244         case DIOCGDINFO:
2245                 bzero(buffer, sizeof (buffer));
2246                 dl = (struct disklabel *)buffer;
2247                 dl->d_secsize = fdblk;
2248                 fdt = fd->ft;
2249                 dl->d_secpercyl = fdt->size / fdt->tracks;
2250                 dl->d_type = DTYPE_FLOPPY;
2251
2252                 if (readdisklabel(dev, dl)
2253                     == NULL)
2254                         error = 0;
2255                 else
2256                         error = EINVAL;
2257
2258                 *(struct disklabel *)addr = *dl;
2259                 break;
2260
2261         case DIOCSDINFO:
2262                 if ((flag & FWRITE) == 0)
2263                         error = EBADF;
2264                 break;
2265
2266         case DIOCWLABEL:
2267                 if ((flag & FWRITE) == 0)
2268                         error = EBADF;
2269                 break;
2270
2271         case DIOCWDINFO:
2272                 if ((flag & FWRITE) == 0) {
2273                         error = EBADF;
2274                         break;
2275                 }
2276
2277                 dl = (struct disklabel *)addr;
2278
2279                 if ((error = setdisklabel((struct disklabel *)buffer, dl,
2280                                           (u_long)0)) != 0)
2281                         break;
2282
2283                 error = writedisklabel(dev, (struct disklabel *)buffer);
2284                 break;
2285         case FD_FORM:
2286                 if ((flag & FWRITE) == 0)
2287                         error = EBADF;  /* must be opened for writing */
2288                 else if (((struct fd_formb *)addr)->format_version !=
2289                         FD_FORMAT_VERSION)
2290                         error = EINVAL; /* wrong version of formatting prog */
2291                 else
2292                         error = fdformat(dev, (struct fd_formb *)addr, td);
2293                 break;
2294
2295         case FD_GTYPE:                  /* get drive type */
2296                 *(struct fd_type *)addr = *fd->ft;
2297                 break;
2298
2299         case FD_STYPE:                  /* set drive type */
2300                 /* this is considered harmful; only allow for superuser */
2301                 if (suser(td) != 0)
2302                         return EPERM;
2303                 *fd->ft = *(struct fd_type *)addr;
2304                 break;
2305
2306         case FD_GOPTS:                  /* get drive options */
2307                 *(int *)addr = fd->options;
2308                 break;
2309
2310         case FD_SOPTS:                  /* set drive options */
2311                 fd->options = *(int *)addr;
2312                 break;
2313
2314         case FD_GSTAT:
2315                 fsp = (struct fdc_status *)addr;
2316                 if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
2317                         return EINVAL;
2318                 memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
2319                 break;
2320
2321         default:
2322                 error = ENOTTY;
2323                 break;
2324         }
2325         return (error);
2326 }
2327
2328 /*
2329  * Hello emacs, these are the
2330  * Local Variables:
2331  *  c-indent-level:               8
2332  *  c-continued-statement-offset: 8
2333  *  c-continued-brace-offset:     0
2334  *  c-brace-offset:              -8
2335  *  c-brace-imaginary-offset:     0
2336  *  c-argdecl-indent:             8
2337  *  c-label-offset:              -8
2338  *  c++-hanging-braces:           1
2339  *  c++-access-specifier-offset: -8
2340  *  c++-empty-arglist-indent:     8
2341  *  c++-friend-offset:            0
2342  * End:
2343  */