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 1.31 2006/07/28 02:17:35 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 ucred *);
 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 dev_ops fd_ops = {
 333         { "fd", FD_CDEV_MAJOR, D_DISK },
 334         .d_open =       Fdopen,
 335         .d_close =      fdclose,
 336         .d_read =       physread,
 337         .d_write =      physwrite,
 338         .d_ioctl =      fdioctl,
 339         .d_strategy =   fdstrategy,
 340 };
 341
 342 static int
 343 fdc_err(struct fdc_data *fdc, const char *s)
 344 {
 345         fdc->fdc_errs++;
 346         if (s) {
 347                 if (fdc->fdc_errs < FDC_ERRMAX)
 348                         device_printf(fdc->fdc_dev, "%s", s);
 349                 else if (fdc->fdc_errs == FDC_ERRMAX)
 350                         device_printf(fdc->fdc_dev, "too many errors, not "
 351                                                     "logging any more\n");
 352         }
 353
 354         return FD_FAILED;
 355 }
 356
 357 /*
 358  * fd_cmd: Send a command to the chip.  Takes a varargs with this structure:
 359  * Unit number,
 360  * # of output bytes, output bytes as ints ...,
 361  * # of input bytes, input bytes as ints ...
 362  */
 363 int
 364 fd_cmd(struct fdc_data *fdc, int n_out, ...)
 365 {
 366         u_char cmd;
 367         int n_in;
 368         int n;
 369         __va_list ap;
 370
 371         __va_start(ap, n_out);
 372         cmd = (u_char)(__va_arg(ap, int));
 373         __va_end(ap);
 374         __va_start(ap, n_out);
 375         for (n = 0; n < n_out; n++)
 376         {
 377                 if (out_fdc(fdc, __va_arg(ap, int)) < 0)
 378                 {
 379                         char msg[50];
 380                         snprintf(msg, sizeof(msg),
 381                                 "cmd %x failed at out byte %d of %d\n",
 382                                 cmd, n + 1, n_out);
 383                         return fdc_err(fdc, msg);
 384                 }
 385         }
 386         n_in = __va_arg(ap, int);
 387         for (n = 0; n < n_in; n++)
 388         {
 389                 int *ptr = __va_arg(ap, int *);
 390                 if (fd_in(fdc, ptr) < 0)
 391                 {
 392                         char msg[50];
 393                         snprintf(msg, sizeof(msg),
 394                                 "cmd %02x failed at in byte %d of %d\n",
 395                                 cmd, n + 1, n_in);
 396                         return fdc_err(fdc, msg);
 397                 }
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int
 404 enable_fifo(fdc_p fdc)
 405 {
 406         int i, j;
 407
 408         if ((fdc->flags & FDC_HAS_FIFO) == 0) {
 409
 410                 /*
 411                  * XXX:
 412                  * Cannot use fd_cmd the normal way here, since
 413                  * this might be an invalid command. Thus we send the
 414                  * first byte, and check for an early turn of data directon.
 415                  */
 416
 417                 if (out_fdc(fdc, I8207X_CONFIGURE) < 0)
 418                         return fdc_err(fdc, "Enable FIFO failed\n");
 419
 420                 /* If command is invalid, return */
 421                 j = FDSTS_TIMEOUT;
 422                 while ((i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM))
 423                        != NE7_RQM && j-- > 0) {
 424                         if (i == (NE7_DIO | NE7_RQM)) {
 425                                 fdc_reset(fdc);
 426                                 return FD_FAILED;
 427                         }
 428                         DELAY(1);
 429                 }
 430                 if (j<0 ||
 431                     fd_cmd(fdc, 3,
 432                            0, (fifo_threshold - 1) & 0xf, 0, 0) < 0) {
 433                         fdc_reset(fdc);
 434                         return fdc_err(fdc, "Enable FIFO failed\n");
 435                 }
 436                 fdc->flags |= FDC_HAS_FIFO;
 437                 return 0;
 438         }
 439         if (fd_cmd(fdc, 4,
 440                    I8207X_CONFIGURE, 0, (fifo_threshold - 1) & 0xf, 0, 0) < 0)
 441                 return fdc_err(fdc, "Re-enable FIFO failed\n");
 442         return 0;
 443 }
 444
 445 static int
 446 fd_sense_drive_status(fdc_p fdc, int *st3p)
 447 {
 448         int st3;
 449
 450         if (fd_cmd(fdc, 2, NE7CMD_SENSED, fdc->fdu, 1, &st3))
 451         {
 452                 return fdc_err(fdc, "Sense Drive Status failed\n");
 453         }
 454         if (st3p)
 455                 *st3p = st3;
 456
 457         return 0;
 458 }
 459
 460 static int
 461 fd_sense_int(fdc_p fdc, int *st0p, int *cylp)
 462 {
 463         int cyl, st0, ret;
 464
 465         ret = fd_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
 466         if (ret) {
 467                 (void)fdc_err(fdc,
 468                               "sense intr err reading stat reg 0\n");
 469                 return ret;
 470         }
 471
 472         if (st0p)
 473                 *st0p = st0;
 474
 475         if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
 476                 /*
 477                  * There doesn't seem to have been an interrupt.
 478                  */
 479                 return FD_NOT_VALID;
 480         }
 481
 482         if (fd_in(fdc, &cyl) < 0) {
 483                 return fdc_err(fdc, "can't get cyl num\n");
 484         }
 485
 486         if (cylp)
 487                 *cylp = cyl;
 488
 489         return 0;
 490 }
 491
 492
 493 static int
 494 fd_read_status(fdc_p fdc, int fdsu)
 495 {
 496         int i, ret;
 497
 498         for (i = 0; i < 7; i++) {
 499                 /*
 500                  * XXX types are poorly chosen.  Only bytes can by read
 501                  * from the hardware, but fdc->status[] wants u_ints and
 502                  * fd_in() gives ints.
 503                  */
 504                 int status;
 505
 506                 ret = fd_in(fdc, &status);
 507                 fdc->status[i] = status;
 508                 if (ret != 0)
 509                         break;
 510         }
 511
 512         if (ret == 0)
 513                 fdc->flags |= FDC_STAT_VALID;
 514         else
 515                 fdc->flags &= ~FDC_STAT_VALID;
 516
 517         return ret;
 518 }
 519
 520 /****************************************************************************/
 521 /*                      autoconfiguration stuff                             */
 522 /****************************************************************************/
 523
 524 int
 525 fdc_alloc_resources(struct fdc_data *fdc)
 526 {
 527         device_t dev;
 528         int ispnp, ispcmcia;
 529
 530         dev = fdc->fdc_dev;
 531         ispnp = (fdc->flags & FDC_ISPNP) != 0;
 532         ispcmcia = (fdc->flags & FDC_ISPCMCIA) != 0;
 533         fdc->rid_ioport = fdc->rid_irq = fdc->rid_drq = 0;
 534         fdc->res_ioport = fdc->res_irq = fdc->res_drq = 0;
 535
 536         /*
 537          * On standard ISA, we don't just use an 8 port range
 538          * (e.g. 0x3f0-0x3f7) since that covers an IDE control
 539          * register at 0x3f6.
 540          *
 541          * Isn't PC hardware wonderful.
 542          *
 543          * The Y-E Data PCMCIA FDC doesn't have this problem, it
 544          * uses the register with offset 6 for pseudo-DMA, and the
 545          * one with offset 7 as control register.
 546          */
 547         fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,
 548                                              &fdc->rid_ioport, 0ul, ~0ul,
 549                                              ispcmcia ? 8 : (ispnp ? 1 : 6),
 550                                              RF_ACTIVE);
 551         if (fdc->res_ioport == 0) {
 552                 device_printf(dev, "cannot reserve I/O port range\n");
 553                 return ENXIO;
 554         }
 555         fdc->portt = rman_get_bustag(fdc->res_ioport);
 556         fdc->porth = rman_get_bushandle(fdc->res_ioport);
 557
 558         if (!ispcmcia) {
 559                 /*
 560                  * Some BIOSen report the device at 0x3f2-0x3f5,0x3f7
 561                  * and some at 0x3f0-0x3f5,0x3f7. We detect the former
 562                  * by checking the size and adjust the port address
 563                  * accordingly.
 564                  */
 565                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4)
 566                         fdc->port_off = -2;
 567
 568                 /*
 569                  * Register the control port range as rid 1 if it
 570                  * isn't there already. Most PnP BIOSen will have
 571                  * already done this but non-PnP configurations don't.
 572                  *
 573                  * And some (!!) report 0x3f2-0x3f5 and completely
 574                  * leave out the control register!  It seems that some
 575                  * non-antique controller chips have a different
 576                  * method of programming the transfer speed which
 577                  * doesn't require the control register, but it's
 578                  * mighty bogus as the chip still responds to the
 579                  * address for the control register.
 580                  */
 581                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
 582                         u_long ctlstart;
 583
 584                         /* Find the control port, usually 0x3f7 */
 585                         ctlstart = rman_get_start(fdc->res_ioport) +
 586                                 fdc->port_off + 7;
 587
 588                         bus_set_resource(dev, SYS_RES_IOPORT, 1, ctlstart, 1);
 589                 }
 590
 591                 /*
 592                  * Now (finally!) allocate the control port.
 593                  */
 594                 fdc->rid_ctl = 1;
 595                 fdc->res_ctl = bus_alloc_resource(dev, SYS_RES_IOPORT,
 596                                                   &fdc->rid_ctl,
 597                                                   0ul, ~0ul, 1, RF_ACTIVE);
 598                 if (fdc->res_ctl == 0) {
 599                         device_printf(dev,
 600                                       "cannot reserve control I/O port range\n");
 601                         return ENXIO;
 602                 }
 603                 fdc->ctlt = rman_get_bustag(fdc->res_ctl);
 604                 fdc->ctlh = rman_get_bushandle(fdc->res_ctl);
 605         }
 606
 607         fdc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ,
 608                                           &fdc->rid_irq, 0ul, ~0ul, 1,
 609                                           RF_ACTIVE);
 610         if (fdc->res_irq == 0) {
 611                 device_printf(dev, "cannot reserve interrupt line\n");
 612                 return ENXIO;
 613         }
 614
 615         if ((fdc->flags & FDC_NODMA) == 0) {
 616                 fdc->res_drq = bus_alloc_resource(dev, SYS_RES_DRQ,
 617                                                   &fdc->rid_drq, 0ul, ~0ul, 1,
 618                                                   RF_ACTIVE);
 619                 if (fdc->res_drq == 0) {
 620                         device_printf(dev, "cannot reserve DMA request line\n");
 621                         return ENXIO;
 622                 }
 623                 fdc->dmachan = fdc->res_drq->r_start;
 624         }
 625
 626         return 0;
 627 }
 628
 629 void
 630 fdc_release_resources(struct fdc_data *fdc)
 631 {
 632         device_t dev;
 633
 634         dev = fdc->fdc_dev;
 635         if (fdc->res_irq != 0) {
 636                 bus_deactivate_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 637                                         fdc->res_irq);
 638                 bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 639                                      fdc->res_irq);
 640         }
 641         if (fdc->res_ctl != 0) {
 642                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
 643                                         fdc->res_ctl);
 644                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
 645                                      fdc->res_ctl);
 646         }
 647         if (fdc->res_ioport != 0) {
 648                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
 649                                         fdc->res_ioport);
 650                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
 651                                      fdc->res_ioport);
 652         }
 653         if (fdc->res_drq != 0) {
 654                 bus_deactivate_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 655                                         fdc->res_drq);
 656                 bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 657                                      fdc->res_drq);
 658         }
 659 }
 660
 661 /****************************************************************************/
 662 /*                      autoconfiguration stuff                             */
 663 /****************************************************************************/
 664
 665 static struct isa_pnp_id fdc_ids[] = {
 666         {0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */
 667         {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
 668         {0}
 669 };
 670
 671 int
 672 fdc_read_ivar(device_t dev, device_t child, int which, u_long *result)
 673 {
 674         struct fdc_ivars *ivars = device_get_ivars(child);
 675
 676         switch (which) {
 677         case FDC_IVAR_FDUNIT:
 678                 *result = ivars->fdunit;
 679                 break;
 680         default:
 681                 return ENOENT;
 682         }
 683         return 0;
 684 }
 685
 686 /*
 687  * fdc controller section.
 688  */
 689 static int
 690 fdc_probe(device_t dev)
 691 {
 692         int     error, ic_type;
 693         struct  fdc_data *fdc;
 694
 695         fdc = device_get_softc(dev);
 696         bzero(fdc, sizeof *fdc);
 697         fdc->fdc_dev = dev;
 698         fdc->fdctl_wr = fdctl_wr_isa;
 699
 700         /* Check pnp ids */
 701         error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
 702         if (error == ENXIO)
 703                 return ENXIO;
 704         if (error == 0)
 705                 fdc->flags |= FDC_ISPNP;
 706
 707         /* Attempt to allocate our resources for the duration of the probe */
 708         error = fdc_alloc_resources(fdc);
 709         if (error)
 710                 goto out;
 711
 712         /* First - lets reset the floppy controller */
 713         fdout_wr(fdc, 0);
 714         DELAY(100);
 715         fdout_wr(fdc, FDO_FRST);
 716
 717         /* see if it can handle a command */
 718         if (fd_cmd(fdc, 3, NE7CMD_SPECIFY, NE7_SPEC_1(3, 240),
 719                    NE7_SPEC_2(2, 0), 0)) {
 720                 error = ENXIO;
 721                 goto out;
 722         }
 723
 724         if (fd_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type) == 0) {
 725                 ic_type = (u_char)ic_type;
 726                 switch (ic_type) {
 727                 case 0x80:
 728                         device_set_desc(dev, "NEC 765 or clone");
 729                         fdc->fdct = FDC_NE765;
 730                         break;
 731                 case 0x81:
 732                         device_set_desc(dev, "Intel 82077 or clone");
 733                         fdc->fdct = FDC_I82077;
 734                         break;
 735                 case 0x90:
 736                         device_set_desc(dev, "NEC 72065B or clone");
 737                         fdc->fdct = FDC_NE72065;
 738                         break;
 739                 default:
 740                         device_set_desc(dev, "generic floppy controller");
 741                         fdc->fdct = FDC_UNKNOWN;
 742                         break;
 743                 }
 744         }
 745
 746 out:
 747         fdc_release_resources(fdc);
 748         return (error);
 749 }
 750
 751 /*
 752  * Add a child device to the fdc controller.  It will then be probed etc.
 753  */
 754 static void
 755 fdc_add_child(device_t dev, const char *name, int unit)
 756 {
 757         int     disabled;
 758         struct fdc_ivars *ivar;
 759         device_t child;
 760
 761         ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_WAITOK | M_ZERO);
 762         if (resource_int_value(name, unit, "drive", &ivar->fdunit) != 0)
 763                 ivar->fdunit = 0;
 764         child = device_add_child(dev, name, unit);
 765         if (child == NULL)
 766                 return;
 767         device_set_ivars(child, ivar);
 768         if (resource_int_value(name, unit, "disabled", &disabled) == 0
 769             && disabled != 0)
 770                 device_disable(child);
 771 }
 772
 773 int
 774 fdc_attach(device_t dev)
 775 {
 776         struct  fdc_data *fdc;
 777         int     i, error;
 778
 779         fdc = device_get_softc(dev);
 780
 781         callout_init(&fdc->pseudointr_ch);
 782
 783         error = fdc_alloc_resources(fdc);
 784         if (error) {
 785                 device_printf(dev, "cannot re-aquire resources\n");
 786                 return error;
 787         }
 788         error = BUS_SETUP_INTR(device_get_parent(dev), dev, fdc->res_irq,
 789                                0, fdc_intr, fdc,
 790                                &fdc->fdc_intr, NULL);
 791         if (error) {
 792                 device_printf(dev, "cannot setup interrupt\n");
 793                 return error;
 794         }
 795         fdc->fdcu = device_get_unit(dev);
 796         fdc->flags |= FDC_ATTACHED;
 797
 798         if ((fdc->flags & FDC_NODMA) == 0) {
 799                 /* Acquire the DMA channel forever, The driver will do the rest */
 800                                 /* XXX should integrate with rman */
 801                 isa_dma_acquire(fdc->dmachan);
 802                 isa_dmainit(fdc->dmachan, 128 << 3 /* XXX max secsize */);
 803         }
 804         fdc->state = DEVIDLE;
 805
 806         /* reset controller, turn motor off, clear fdout mirror reg */
 807         fdout_wr(fdc, ((fdc->fdout = 0)));
 808         bioq_init(&fdc->bio_queue);
 809
 810         /*
 811          * Probe and attach any children.  We should probably detect
 812          * devices from the BIOS unless overridden.
 813          */
 814         for (i = resource_query_string(-1, "at", device_get_nameunit(dev));
 815              i != -1;
 816              i = resource_query_string(i, "at", device_get_nameunit(dev)))
 817                 fdc_add_child(dev, resource_query_name(i),
 818                                resource_query_unit(i));
 819
 820         return (bus_generic_attach(dev));
 821 }
 822
 823 int
 824 fdc_print_child(device_t me, device_t child)
 825 {
 826         int retval = 0;
 827
 828         retval += bus_print_child_header(me, child);
 829         retval += printf(" on %s drive %d\n", device_get_nameunit(me),
 830                fdc_get_fdunit(child));
 831
 832         return (retval);
 833 }
 834
 835 static device_method_t fdc_methods[] = {
 836         /* Device interface */
 837         DEVMETHOD(device_probe,         fdc_probe),
 838         DEVMETHOD(device_attach,        fdc_attach),
 839         DEVMETHOD(device_detach,        bus_generic_detach),
 840         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
 841         DEVMETHOD(device_suspend,       bus_generic_suspend),
 842         DEVMETHOD(device_resume,        bus_generic_resume),
 843
 844         /* Bus interface */
 845         DEVMETHOD(bus_print_child,      fdc_print_child),
 846         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
 847         /* Our children never use any other bus interface methods. */
 848
 849         { 0, 0 }
 850 };
 851
 852 static driver_t fdc_driver = {
 853         "fdc",
 854         fdc_methods,
 855         sizeof(struct fdc_data)
 856 };
 857
 858 DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);
 859
 860 /******************************************************************/
 861 /*
 862  * devices attached to the controller section.
 863  */
 864 static int
 865 fd_probe(device_t dev)
 866 {
 867         int     i;
 868         u_int   fdt, st0, st3;
 869         struct  fd_data *fd;
 870         struct  fdc_data *fdc;
 871         fdsu_t  fdsu;
 872         static int fd_fifo = 0;
 873
 874         fdsu = *(int *)device_get_ivars(dev); /* xxx cheat a bit... */
 875         fd = device_get_softc(dev);
 876         fdc = device_get_softc(device_get_parent(dev));
 877
 878         bzero(fd, sizeof *fd);
 879         fd->dev = dev;
 880         fd->fdc = fdc;
 881         fd->fdsu = fdsu;
 882         fd->fdu = device_get_unit(dev);
 883
 884 #ifdef __i386__
 885         /* look up what bios thinks we have */
 886         switch (fd->fdu) {
 887         case 0:
 888                 if ((fdc->flags & FDC_ISPCMCIA))
 889                         fdt = RTCFDT_144M;
 890                 else if (device_get_flags(fdc->fdc_dev) & FDC_PRETEND_D0)
 891                         fdt = RTCFDT_144M | RTCFDT_144M_PRETENDED;
 892                 else
 893                         fdt = (rtcin(RTC_FDISKETTE) & 0xf0);
 894                 break;
 895         case 1:
 896                 fdt = ((rtcin(RTC_FDISKETTE) << 4) & 0xf0);
 897                 break;
 898         default:
 899                 fdt = RTCFDT_NONE;
 900                 break;
 901         }
 902 #else
 903         fdt = RTCFDT_144M;      /* XXX probably */
 904 #endif
 905
 906         /* is there a unit? */
 907         if (fdt == RTCFDT_NONE)
 908                 return (ENXIO);
 909
 910         /* select it */
 911         set_motor(fdc, fdsu, TURNON);
 912         DELAY(1000000); /* 1 sec */
 913
 914         /* XXX This doesn't work before the first set_motor() */
 915         if (fd_fifo == 0 && fdc->fdct != FDC_NE765 && fdc->fdct != FDC_UNKNOWN
 916             && (device_get_flags(fdc->fdc_dev) & FDC_NO_FIFO) == 0
 917             && enable_fifo(fdc) == 0) {
 918                 device_printf(device_get_parent(dev),
 919                     "FIFO enabled, %d bytes threshold\n", fifo_threshold);
 920         }
 921         fd_fifo = 1;
 922
 923         if ((fd_cmd(fdc, 2, NE7CMD_SENSED, fdsu, 1, &st3) == 0)
 924             && (st3 & NE7_ST3_T0)) {
 925                 /* if at track 0, first seek inwards */
 926                 /* seek some steps: */
 927                 fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0);
 928                 DELAY(300000); /* ...wait a moment... */
 929                 fd_sense_int(fdc, 0, 0); /* make ctrlr happy */
 930         }
 931
 932         /* If we're at track 0 first seek inwards. */
 933         if ((fd_sense_drive_status(fdc, &st3) == 0) && (st3 & NE7_ST3_T0)) {
 934                 /* Seek some steps... */
 935                 if (fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
 936                         /* ...wait a moment... */
 937                         DELAY(300000);
 938                         /* make ctrlr happy: */
 939                         fd_sense_int(fdc, 0, 0);
 940                 }
 941         }
 942
 943         for (i = 0; i < 2; i++) {
 944                 /*
 945                  * we must recalibrate twice, just in case the
 946                  * heads have been beyond cylinder 76, since most
 947                  * FDCs still barf when attempting to recalibrate
 948                  * more than 77 steps
 949                  */
 950                 /* go back to 0: */
 951                 if (fd_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
 952                         /* a second being enough for full stroke seek*/
 953                         DELAY(i == 0 ? 1000000 : 300000);
 954
 955                         /* anything responding? */
 956                         if (fd_sense_int(fdc, &st0, 0) == 0 &&
 957                             (st0 & NE7_ST0_EC) == 0)
 958                                 break; /* already probed succesfully */
 959                 }
 960         }
 961
 962         set_motor(fdc, fdsu, TURNOFF);
 963
 964         if (st0 & NE7_ST0_EC) /* no track 0 -> no drive present */
 965                 return (ENXIO);
 966
 967         fd->track = FD_NO_TRACK;
 968         fd->fdc = fdc;
 969         fd->fdsu = fdsu;
 970         fd->options = 0;
 971         callout_init(&fd->toffhandle);
 972         callout_init(&fd->tohandle);
 973         callout_init(&fd->motor);
 974
 975         switch (fdt) {
 976         case RTCFDT_12M:
 977                 device_set_desc(dev, "1200-KB 5.25\" drive");
 978                 fd->type = FD_1200;
 979                 break;
 980         case RTCFDT_144M | RTCFDT_144M_PRETENDED:
 981                 device_set_desc(dev, "config-pretended 1440-MB 3.5\" drive");
 982                 fdt = RTCFDT_144M;
 983                 fd->type = FD_1440;
 984         case RTCFDT_144M:
 985                 device_set_desc(dev, "1440-KB 3.5\" drive");
 986                 fd->type = FD_1440;
 987                 break;
 988         case RTCFDT_288M:
 989         case RTCFDT_288M_1:
 990                 device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
 991                 fd->type = FD_1440;
 992                 break;
 993         case RTCFDT_360K:
 994                 device_set_desc(dev, "360-KB 5.25\" drive");
 995                 fd->type = FD_360;
 996                 break;
 997         case RTCFDT_720K:
 998                 printf("720-KB 3.5\" drive");
 999                 fd->type = FD_720;
1000                 break;
1001         default:
1002                 return (ENXIO);
1003         }
1004         return (0);
1005 }
1006
1007 static int
1008 fd_attach(device_t dev)
1009 {
1010         struct  fd_data *fd;
1011 #if 0
1012         int     i;
1013         int     mynor;
1014         int     typemynor;
1015         int     typesize;
1016 #endif
1017
1018         fd = device_get_softc(dev);
1019
1020         dev_ops_add(&fd_ops, -1 << 6, fd->fdu << 6);
1021         make_dev(&fd_ops, (fd->fdu << 6),
1022                 UID_ROOT, GID_OPERATOR, 0640, "rfd%d", fd->fdu);
1023
1024 #if 0
1025         /* Other make_dev() go here. */
1026 #endif
1027
1028         /*
1029          * Export the drive to the devstat interface.
1030          */
1031         devstat_add_entry(&fd->device_stats, device_get_name(dev),
1032                           device_get_unit(dev), 512, DEVSTAT_NO_ORDERED_TAGS,
1033                           DEVSTAT_TYPE_FLOPPY | DEVSTAT_TYPE_IF_OTHER,
1034                           DEVSTAT_PRIORITY_FD);
1035         return (0);
1036 }
1037
1038 static int
1039 fd_detach(device_t dev)
1040 {
1041         struct  fd_data *fd;
1042
1043         fd = device_get_softc(dev);
1044         callout_stop(&fd->toffhandle);
1045         callout_stop(&fd->motor);
1046
1047         return (0);
1048 }
1049
1050 static device_method_t fd_methods[] = {
1051         /* Device interface */
1052         DEVMETHOD(device_probe,         fd_probe),
1053         DEVMETHOD(device_attach,        fd_attach),
1054         DEVMETHOD(device_detach,        fd_detach),
1055         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
1056         DEVMETHOD(device_suspend,       bus_generic_suspend), /* XXX */
1057         DEVMETHOD(device_resume,        bus_generic_resume), /* XXX */
1058
1059         { 0, 0 }
1060 };
1061
1062 static driver_t fd_driver = {
1063         "fd",
1064         fd_methods,
1065         sizeof(struct fd_data)
1066 };
1067
1068 DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, 0, 0);
1069
1070 /****************************************************************************/
1071 /*                            motor control stuff                           */
1072 /*              remember to not deselect the drive we're working on         */
1073 /****************************************************************************/
1074 static void
1075 set_motor(struct fdc_data *fdc, int fdsu, int turnon)
1076 {
1077         int fdout = fdc->fdout;
1078         int needspecify = 0;
1079
1080         if(turnon) {
1081                 fdout &= ~FDO_FDSEL;
1082                 fdout |= (FDO_MOEN0 << fdsu) + fdsu;
1083         } else
1084                 fdout &= ~(FDO_MOEN0 << fdsu);
1085
1086         if(!turnon
1087            && (fdout & (FDO_MOEN0+FDO_MOEN1+FDO_MOEN2+FDO_MOEN3)) == 0)
1088                 /* gonna turn off the last drive, put FDC to bed */
1089                 fdout &= ~ (FDO_FRST|FDO_FDMAEN);
1090         else {
1091                 /* make sure controller is selected and specified */
1092                 if((fdout & (FDO_FRST|FDO_FDMAEN)) == 0)
1093                         needspecify = 1;
1094                 fdout |= (FDO_FRST|FDO_FDMAEN);
1095         }
1096
1097         fdout_wr(fdc, fdout);
1098         fdc->fdout = fdout;
1099         TRACE1("[0x%x->FDOUT]", fdout);
1100
1101         if (needspecify) {
1102                 /*
1103                  * XXX
1104                  * special case: since we have just woken up the FDC
1105                  * from its sleep, we silently assume the command will
1106                  * be accepted, and do not test for a timeout
1107                  */
1108                 (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1109                              NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1110                              0);
1111                 if (fdc->flags & FDC_HAS_FIFO)
1112                         (void) enable_fifo(fdc);
1113         }
1114 }
1115
1116 static void
1117 fd_turnoff(void *xfd)
1118 {
1119         fd_p fd = xfd;
1120
1121         TRACE1("[fd%d: turnoff]", fd->fdu);
1122
1123         crit_enter();
1124         /*
1125          * Don't turn off the motor yet if the drive is active.
1126          *
1127          * If we got here, this could only mean we missed an interrupt.
1128          * This can e. g. happen on the Y-E Date PCMCIA floppy controller
1129          * after a controller reset.  Just schedule a pseudo-interrupt
1130          * so the state machine gets re-entered.
1131          */
1132         if (fd->fdc->state != DEVIDLE && fd->fdc->fdu == fd->fdu) {
1133                 fdc_intr(fd->fdc);
1134                 crit_exit();
1135                 return;
1136         }
1137
1138         fd->flags &= ~FD_MOTOR;
1139         set_motor(fd->fdc, fd->fdsu, TURNOFF);
1140         crit_exit();
1141 }
1142
1143 static void
1144 fd_motor_on(void *xfd)
1145 {
1146         fd_p fd = xfd;
1147
1148         crit_enter();
1149         fd->flags &= ~FD_MOTOR_WAIT;
1150         if((fd->fdc->fd == fd) && (fd->fdc->state == MOTORWAIT))
1151         {
1152                 fdc_intr(fd->fdc);
1153         }
1154         crit_exit();
1155 }
1156
1157 static void
1158 fd_turnon(fd_p fd)
1159 {
1160         if(!(fd->flags & FD_MOTOR))
1161         {
1162                 fd->flags |= (FD_MOTOR + FD_MOTOR_WAIT);
1163                 set_motor(fd->fdc, fd->fdsu, TURNON);
1164                 callout_reset(&fd->motor, hz, fd_motor_on, fd);
1165         }
1166 }
1167
1168 static void
1169 fdc_reset(fdc_p fdc)
1170 {
1171         /* Try a reset, keep motor on */
1172         fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1173         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1174         DELAY(100);
1175         /* enable FDC, but defer interrupts a moment */
1176         fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
1177         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~FDO_FDMAEN);
1178         DELAY(100);
1179         fdout_wr(fdc, fdc->fdout);
1180         TRACE1("[0x%x->FDOUT]", fdc->fdout);
1181
1182         /* XXX after a reset, silently believe the FDC will accept commands */
1183         (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1184                      NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1185                      0);
1186         if (fdc->flags & FDC_HAS_FIFO)
1187                 (void) enable_fifo(fdc);
1188 }
1189
1190 /****************************************************************************/
1191 /*                             fdc in/out                                   */
1192 /****************************************************************************/
1193 /*
1194  * FDC IO functions, take care of the main status register, timeout
1195  * in case the desired status bits are never set.
1196  *
1197  * These PIO loops initially start out with short delays between
1198  * each iteration in the expectation that the required condition
1199  * is usually met quickly, so it can be handled immediately.  After
1200  * about 1 ms, stepping is increased to achieve a better timing
1201  * accuracy in the calls to DELAY().
1202  */
1203 static int
1204 fd_in(struct fdc_data *fdc, int *ptr)
1205 {
1206         int i, j, step;
1207
1208         for (j = 0, step = 1;
1209             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != (NE7_DIO|NE7_RQM) &&
1210             j < FDSTS_TIMEOUT;
1211             j += step) {
1212                 if (i == NE7_RQM)
1213                         return (fdc_err(fdc, "ready for output in input\n"));
1214                 if (j == 1000)
1215                         step = 1000;
1216                 DELAY(step);
1217         }
1218         if (j >= FDSTS_TIMEOUT)
1219                 return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
1220 #ifdef  FDC_DEBUG
1221         i = fddata_rd(fdc);
1222         TRACE1("[FDDATA->0x%x]", (unsigned char)i);
1223         *ptr = i;
1224         return (0);
1225 #else   /* !FDC_DEBUG */
1226         i = fddata_rd(fdc);
1227         if (ptr)
1228                 *ptr = i;
1229         return (0);
1230 #endif  /* FDC_DEBUG */
1231 }
1232
1233 static int
1234 out_fdc(struct fdc_data *fdc, int x)
1235 {
1236         int i, j, step;
1237
1238         for (j = 0, step = 1;
1239             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != NE7_RQM &&
1240             j < FDSTS_TIMEOUT;
1241             j += step) {
1242                 if (i == (NE7_DIO|NE7_RQM))
1243                         return (fdc_err(fdc, "ready for input in output\n"));
1244                 if (j == 1000)
1245                         step = 1000;
1246                 DELAY(step);
1247         }
1248         if (j >= FDSTS_TIMEOUT)
1249                 return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
1250
1251         /* Send the command and return */
1252         fddata_wr(fdc, x);
1253         TRACE1("[0x%x->FDDATA]", x);
1254         return (0);
1255 }
1256
1257 /****************************************************************************/
1258 /*                           fdopen/fdclose                                 */
1259 /****************************************************************************/
1260 int
1261 Fdopen(struct dev_open_args *ap)
1262 {
1263         dev_t dev = ap->a_head.a_dev;
1264         fdu_t fdu = FDUNIT(minor(dev));
1265         int type = FDTYPE(minor(dev));
1266         fd_p    fd;
1267         fdc_p   fdc;
1268
1269         /* check bounds */
1270         if ((fd = devclass_get_softc(fd_devclass, fdu)) == 0)
1271                 return (ENXIO);
1272         fdc = fd->fdc;
1273         if ((fdc == NULL) || (fd->type == NO_TYPE))
1274                 return (ENXIO);
1275         if (type > NUMDENS)
1276                 return (ENXIO);
1277         if (type == 0)
1278                 type = fd->type;
1279         else {
1280                 /*
1281                  * For each type of basic drive, make sure we are trying
1282                  * to open a type it can do,
1283                  */
1284                 if (type != fd->type) {
1285                         switch (fd->type) {
1286                         case FD_360:
1287                                 return (ENXIO);
1288                         case FD_720:
1289                                 if (   type != FD_820
1290                                     && type != FD_800
1291                                     && type != FD_640
1292                                    )
1293                                         return (ENXIO);
1294                                 break;
1295                         case FD_1200:
1296                                 switch (type) {
1297                                 case FD_1480:
1298                                         type = FD_1480in5_25;
1299                                         break;
1300                                 case FD_1440:
1301                                         type = FD_1440in5_25;
1302                                         break;
1303                                 case FD_1232:
1304                                         break;
1305                                 case FD_820:
1306                                         type = FD_820in5_25;
1307                                         break;
1308                                 case FD_800:
1309                                         type = FD_800in5_25;
1310                                         break;
1311                                 case FD_720:
1312                                         type = FD_720in5_25;
1313                                         break;
1314                                 case FD_640:
1315                                         type = FD_640in5_25;
1316                                         break;
1317                                 case FD_360:
1318                                         type = FD_360in5_25;
1319                                         break;
1320                                 default:
1321                                         return(ENXIO);
1322                                 }
1323                                 break;
1324                         case FD_1440:
1325                                 if (   type != FD_1720
1326                                     && type != FD_1480
1327                                     && type != FD_1200
1328                                     && type != FD_820
1329                                     && type != FD_800
1330                                     && type != FD_720
1331                                     && type != FD_640
1332                                     )
1333                                         return(ENXIO);
1334                                 break;
1335                         }
1336                 }
1337         }
1338         fd->ft = fd_types + type - 1;
1339         fd->flags |= FD_OPEN;
1340         /*
1341          * Clearing the DMA overrun counter at open time is a bit messy.
1342          * Since we're only managing one counter per controller, opening
1343          * the second drive could mess it up.  Anyway, if the DMA overrun
1344          * condition is really persistent, it will eventually time out
1345          * still.  OTOH, clearing it here will ensure we'll at least start
1346          * trying again after a previous (maybe even long ago) failure.
1347          * Also, this is merely a stop-gap measure only that should not
1348          * happen during normal operation, so we can tolerate it to be a
1349          * bit sloppy about this.
1350          */
1351         fdc->dma_overruns = 0;
1352
1353         return 0;
1354 }
1355
1356 int
1357 fdclose(struct dev_close_args *ap)
1358 {
1359         dev_t dev = ap->a_head.a_dev;
1360         fdu_t fdu = FDUNIT(minor(dev));
1361         struct fd_data *fd;
1362
1363         fd = devclass_get_softc(fd_devclass, fdu);
1364         fd->flags &= ~FD_OPEN;
1365         fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG);
1366
1367         return (0);
1368 }
1369
1370 /****************************************************************************/
1371 /*                               fdstrategy                                 */
1372 /****************************************************************************/
1373 int
1374 fdstrategy(struct dev_strategy_args *ap)
1375 {
1376         dev_t dev = ap->a_head.a_dev;
1377         struct bio *bio = ap->a_bio;
1378         struct buf *bp = bio->bio_buf;
1379         unsigned nblocks, blknum, cando;
1380         fdu_t   fdu;
1381         fdc_p   fdc;
1382         fd_p    fd;
1383         size_t  fdblk;
1384
1385         fdu = FDUNIT(minor(dev));
1386         fd = devclass_get_softc(fd_devclass, fdu);
1387         if (fd == 0)
1388                 panic("fdstrategy: buf for nonexistent device (%#lx, %#lx)",
1389                       (u_long)major(dev), (u_long)minor(dev));
1390         fdc = fd->fdc;
1391         if (fd->type == NO_TYPE) {
1392                 bp->b_error = ENXIO;
1393                 bp->b_flags |= B_ERROR;
1394                 goto bad;
1395         };
1396
1397         fdblk = 128 << (fd->ft->secsize);
1398         if (bp->b_cmd != BUF_CMD_FORMAT) {
1399                 if (bio->bio_offset < 0) {
1400                         printf(
1401                 "fd%d: fdstrat: bad request offset = %lld, bcount = %d\n",
1402                                fdu, bio->bio_offset, bp->b_bcount);
1403                         bp->b_error = EINVAL;
1404                         bp->b_flags |= B_ERROR;
1405                         goto bad;
1406                 }
1407                 if ((bp->b_bcount % fdblk) != 0) {
1408                         bp->b_error = EINVAL;
1409                         bp->b_flags |= B_ERROR;
1410                         goto bad;
1411                 }
1412         }
1413
1414         /*
1415          * Set up block calculations.
1416          */
1417         if (bio->bio_offset > 20000000LL * fdblk) {
1418                 /*
1419                  * Reject unreasonably high block number, prevent the
1420                  * multiplication below from overflowing.
1421                  */
1422                 bp->b_error = EINVAL;
1423                 bp->b_flags |= B_ERROR;
1424                 goto bad;
1425         }
1426         blknum = (unsigned)(bio->bio_offset / fdblk);
1427         nblocks = fd->ft->size;
1428         bp->b_resid = 0;
1429         if (blknum + (bp->b_bcount / fdblk) > nblocks) {
1430                 if (blknum <= nblocks) {
1431                         cando = (nblocks - blknum) * fdblk;
1432                         bp->b_resid = bp->b_bcount - cando;
1433                         if (cando == 0)
1434                                 goto bad;       /* not actually bad but EOF */
1435                 } else {
1436                         bp->b_error = EINVAL;
1437                         bp->b_flags |= B_ERROR;
1438                         goto bad;
1439                 }
1440         }
1441         crit_enter();
1442         bio->bio_driver_info = dev;
1443         bioqdisksort(&fdc->bio_queue, bio);
1444         callout_stop(&fd->toffhandle);
1445
1446         /* Tell devstat we are starting on the transaction */
1447         devstat_start_transaction(&fd->device_stats);
1448         device_busy(fd->dev);
1449
1450         fdstart(fdc);
1451         crit_exit();
1452         return(0);
1453
1454 bad:
1455         biodone(bio);
1456         return(0);
1457 }
1458
1459 /***************************************************************\
1460 *                               fdstart                         *
1461 * We have just queued something.. if the controller is not busy *
1462 * then simulate the case where it has just finished a command   *
1463 * So that it (the interrupt routine) looks on the queue for more*
1464 * work to do and picks up what we just added.                   *
1465 * If the controller is already busy, we need do nothing, as it  *
1466 * will pick up our work when the present work completes         *
1467 \***************************************************************/
1468 static void
1469 fdstart(struct fdc_data *fdc)
1470 {
1471         crit_enter();
1472         if(fdc->state == DEVIDLE)
1473         {
1474                 fdc_intr(fdc);
1475         }
1476         crit_exit();
1477 }
1478
1479 static void
1480 fd_iotimeout(void *xfdc)
1481 {
1482         fdc_p fdc;
1483
1484         fdc = xfdc;
1485         TRACE1("fd%d[fd_iotimeout()]", fdc->fdu);
1486
1487         /*
1488          * Due to IBM's brain-dead design, the FDC has a faked ready
1489          * signal, hardwired to ready == true. Thus, any command
1490          * issued if there's no diskette in the drive will _never_
1491          * complete, and must be aborted by resetting the FDC.
1492          * Many thanks, Big Blue!
1493          * The FDC must not be reset directly, since that would
1494          * interfere with the state machine.  Instead, pretend that
1495          * the command completed but was invalid.  The state machine
1496          * will reset the FDC and retry once.
1497          */
1498         crit_enter();
1499         fdc->status[0] = NE7_ST0_IC_IV;
1500         fdc->flags &= ~FDC_STAT_VALID;
1501         fdc->state = IOTIMEDOUT;
1502         fdc_intr(fdc);
1503         crit_exit();
1504 }
1505
1506 /* just ensure it is running in a critical section */
1507 static void
1508 fd_pseudointr(void *xfdc)
1509 {
1510         crit_enter();
1511         fdc_intr(xfdc);
1512         crit_exit();
1513 }
1514
1515 /***********************************************************************\
1516 *                                 fdintr                                *
1517 * keep calling the state machine until it returns a 0                   *
1518 * ALWAYS called at SPLBIO                                               *
1519 \***********************************************************************/
1520 static void
1521 fdc_intr(void *xfdc)
1522 {
1523         fdc_p fdc = xfdc;
1524         while(fdstate(fdc))
1525                 ;
1526 }
1527
1528 /*
1529  * magic pseudo-DMA initialization for YE FDC. Sets count and
1530  * direction
1531  */
1532 #define SET_BCDR(fdc,wr,cnt,port) \
1533         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port,  \
1534             ((cnt)-1) & 0xff);                                           \
1535         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port + 1, \
1536             ((wr ? 0x80 : 0) | ((((cnt)-1) >> 8) & 0x7f)));
1537
1538 /*
1539  * fdcpio(): perform programmed IO read/write for YE PCMCIA floppy
1540  */
1541 static int fdcpio(fdc_p fdc, buf_cmd_t cmd, caddr_t addr, u_int count)
1542 {
1543         u_char *cptr = (u_char *)addr;
1544
1545         if (cmd == BUF_CMD_READ) {
1546                 if (fdc->state != PIOREAD) {
1547                         fdc->state = PIOREAD;
1548                         return(0);
1549                 };
1550                 SET_BCDR(fdc, 0, count, 0);
1551                 bus_space_read_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1552                     FDC_YE_DATAPORT, cptr, count);
1553         } else {
1554                 bus_space_write_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1555                     FDC_YE_DATAPORT, cptr, count);
1556                 SET_BCDR(fdc, 0, count, 0);
1557         };
1558         return(1);
1559 }
1560
1561 /***********************************************************************\
1562 * The controller state machine.                                         *
1563 * if it returns a non zero value, it should be called again immediatly  *
1564 \***********************************************************************/
1565 static int
1566 fdstate(fdc_p fdc)
1567 {
1568         int read, format, head, i, sec = 0, sectrac, st0, cyl, st3;
1569         unsigned blknum = 0, b_cylinder = 0;
1570         fdu_t fdu = fdc->fdu;
1571         fd_p fd;
1572         struct bio *bio;
1573         struct buf *bp;
1574         struct fd_formb *finfo = NULL;
1575         size_t fdblk;
1576         dev_t dev;
1577
1578         bio = fdc->bio;
1579         if (bio == NULL) {
1580                 bio = bioq_first(&fdc->bio_queue);
1581                 if (bio != NULL) {
1582                         bioq_remove(&fdc->bio_queue, bio);
1583                         fdc->bio = bio;
1584                 }
1585         }
1586         if (bio == NULL) {
1587                 /***********************************************\
1588                 * nothing left for this controller to do        *
1589                 * Force into the IDLE state,                    *
1590                 \***********************************************/
1591                 fdc->state = DEVIDLE;
1592                 if (fdc->fd) {
1593                         device_printf(fdc->fdc_dev,
1594                             "unexpected valid fd pointer\n");
1595                         fdc->fd = (fd_p) 0;
1596                         fdc->fdu = -1;
1597                 }
1598                 TRACE1("[fdc%d IDLE]", fdc->fdcu);
1599                 return (0);
1600         }
1601         bp = bio->bio_buf;
1602         dev = bio->bio_driver_info;
1603
1604         fdu = FDUNIT(minor(dev));
1605         fd = devclass_get_softc(fd_devclass, fdu);
1606         fdblk = 128 << fd->ft->secsize;
1607         if (fdc->fd && (fd != fdc->fd))
1608                 device_printf(fd->dev, "confused fd pointers\n");
1609         read = (bp->b_cmd == BUF_CMD_READ);
1610         format = (bp->b_cmd == BUF_CMD_FORMAT);
1611         if (format) {
1612                 finfo = (struct fd_formb *)bp->b_data;
1613                 fd->skip = (char *)&(finfo->fd_formb_cylno(0))
1614                         - (char *)finfo;
1615         }
1616         if (fdc->state == DOSEEK || fdc->state == SEEKCOMPLETE) {
1617                 blknum = (unsigned)(bio->bio_offset / fdblk) +
1618                          fd->skip  /fdblk;
1619                 b_cylinder = blknum / (fd->ft->sectrac * fd->ft->heads);
1620         }
1621         TRACE1("fd%d", fdu);
1622         TRACE1("[%s]", fdstates[fdc->state]);
1623         TRACE1("(0x%x)", fd->flags);
1624         callout_reset(&fd->toffhandle, 4 * hz, fd_turnoff, fd);
1625         switch (fdc->state)
1626         {
1627         case DEVIDLE:
1628         case FINDWORK:  /* we have found new work */
1629                 fdc->retry = 0;
1630                 fd->skip = 0;
1631                 fdc->fd = fd;
1632                 fdc->fdu = fdu;
1633                 fdc->fdctl_wr(fdc, fd->ft->trans);
1634                 TRACE1("[0x%x->FDCTL]", fd->ft->trans);
1635                 /*******************************************************\
1636                 * If the next drive has a motor startup pending, then   *
1637                 * it will start up in its own good time         *
1638                 \*******************************************************/
1639                 if(fd->flags & FD_MOTOR_WAIT) {
1640                         fdc->state = MOTORWAIT;
1641                         return (0); /* come back later */
1642                 }
1643                 /*******************************************************\
1644                 * Maybe if it's not starting, it SHOULD be starting     *
1645                 \*******************************************************/
1646                 if (!(fd->flags & FD_MOTOR))
1647                 {
1648                         fdc->state = MOTORWAIT;
1649                         fd_turnon(fd);
1650                         return (0);
1651                 }
1652                 else    /* at least make sure we are selected */
1653                 {
1654                         set_motor(fdc, fd->fdsu, TURNON);
1655                 }
1656                 if (fdc->flags & FDC_NEEDS_RESET) {
1657                         fdc->state = RESETCTLR;
1658                         fdc->flags &= ~FDC_NEEDS_RESET;
1659                 } else
1660                         fdc->state = DOSEEK;
1661                 break;
1662         case DOSEEK:
1663                 if (b_cylinder == (unsigned)fd->track)
1664                 {
1665                         fdc->state = SEEKCOMPLETE;
1666                         break;
1667                 }
1668                 if (fd_cmd(fdc, 3, NE7CMD_SEEK,
1669                            fd->fdsu, b_cylinder * fd->ft->steptrac,
1670                            0))
1671                 {
1672                         /*
1673                          * seek command not accepted, looks like
1674                          * the FDC went off to the Saints...
1675                          */
1676                         fdc->retry = 6; /* try a reset */
1677                         return(retrier(fdc));
1678                 }
1679                 fd->track = FD_NO_TRACK;
1680                 fdc->state = SEEKWAIT;
1681                 return(0);      /* will return later */
1682         case SEEKWAIT:
1683                 /* allow heads to settle */
1684                 callout_reset(&fdc->pseudointr_ch, hz / 16,
1685                                fd_pseudointr, fdc);
1686                 fdc->state = SEEKCOMPLETE;
1687                 return(0);      /* will return later */
1688         case SEEKCOMPLETE : /* SEEK DONE, START DMA */
1689                 /* Make sure seek really happened*/
1690                 if(fd->track == FD_NO_TRACK) {
1691                         int descyl = b_cylinder * fd->ft->steptrac;
1692                         do {
1693                                 /*
1694                                  * This might be a "ready changed" interrupt,
1695                                  * which cannot really happen since the
1696                                  * RDY pin is hardwired to + 5 volts.  This
1697                                  * generally indicates a "bouncing" intr
1698                                  * line, so do one of the following:
1699                                  *
1700                                  * When running on an enhanced FDC that is
1701                                  * known to not go stuck after responding
1702                                  * with INVALID, fetch all interrupt states
1703                                  * until seeing either an INVALID or a
1704                                  * real interrupt condition.
1705                                  *
1706                                  * When running on a dumb old NE765, give
1707                                  * up immediately.  The controller will
1708                                  * provide up to four dummy RC interrupt
1709                                  * conditions right after reset (for the
1710                                  * corresponding four drives), so this is
1711                                  * our only chance to get notice that it
1712                                  * was not the FDC that caused the interrupt.
1713                                  */
1714                                 if (fd_sense_int(fdc, &st0, &cyl)
1715                                     == FD_NOT_VALID)
1716                                         return 0;
1717                                 if(fdc->fdct == FDC_NE765
1718                                    && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
1719                                         return 0; /* hope for a real intr */
1720                         } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
1721
1722                         if (0 == descyl) {
1723                                 int failed = 0;
1724                                 /*
1725                                  * seek to cyl 0 requested; make sure we are
1726                                  * really there
1727                                  */
1728                                 if (fd_sense_drive_status(fdc, &st3))
1729                                         failed = 1;
1730                                 if ((st3 & NE7_ST3_T0) == 0) {
1731                                         printf(
1732                 "fd%d: Seek to cyl 0, but not really there (ST3 = %b)\n",
1733                                                fdu, st3, NE7_ST3BITS);
1734                                         failed = 1;
1735                                 }
1736
1737                                 if (failed) {
1738                                         if(fdc->retry < 3)
1739                                                 fdc->retry = 3;
1740                                         return (retrier(fdc));
1741                                 }
1742                         }
1743
1744                         if (cyl != descyl) {
1745                                 printf(
1746                 "fd%d: Seek to cyl %d failed; am at cyl %d (ST0 = 0x%x)\n",
1747                                        fdu, descyl, cyl, st0);
1748                                 if (fdc->retry < 3)
1749                                         fdc->retry = 3;
1750                                 return (retrier(fdc));
1751                         }
1752                 }
1753
1754                 fd->track = b_cylinder;
1755                 if (!(fdc->flags & FDC_NODMA)) {
1756                         isa_dmastart(isa_dmabp(bp),
1757                                      bp->b_data+fd->skip,
1758                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1759                 }
1760                 sectrac = fd->ft->sectrac;
1761                 sec = blknum %  (sectrac * fd->ft->heads);
1762                 head = sec / sectrac;
1763                 sec = sec % sectrac + 1;
1764                 fd->hddrv = ((head&1)<<2)+fdu;
1765
1766                 if(format || !read)
1767                 {
1768                         /* make sure the drive is writable */
1769                         if(fd_sense_drive_status(fdc, &st3) != 0)
1770                         {
1771                                 /* stuck controller? */
1772                                 if (!(fdc->flags & FDC_NODMA))
1773                                         isa_dmadone(isa_dmabp(bp),
1774                                                     bp->b_data + fd->skip,
1775                                                     format ? bp->b_bcount : fdblk,
1776                                                     fdc->dmachan);
1777                                 fdc->retry = 6; /* reset the beast */
1778                                 return (retrier(fdc));
1779                         }
1780                         if(st3 & NE7_ST3_WP)
1781                         {
1782                                 /*
1783                                  * XXX YES! this is ugly.
1784                                  * in order to force the current operation
1785                                  * to fail, we will have to fake an FDC
1786                                  * error - all error handling is done
1787                                  * by the retrier()
1788                                  */
1789                                 fdc->status[0] = NE7_ST0_IC_AT;
1790                                 fdc->status[1] = NE7_ST1_NW;
1791                                 fdc->status[2] = 0;
1792                                 fdc->status[3] = fd->track;
1793                                 fdc->status[4] = head;
1794                                 fdc->status[5] = sec;
1795                                 fdc->retry = 8; /* break out immediately */
1796                                 fdc->state = IOTIMEDOUT; /* not really... */
1797                                 return (1);
1798                         }
1799                 }
1800
1801                 if (format) {
1802                         if (fdc->flags & FDC_NODMA) {
1803                                 /*
1804                                  * This seems to be necessary for
1805                                  * whatever obscure reason; if we omit
1806                                  * it, we end up filling the sector ID
1807                                  * fields of the newly formatted track
1808                                  * entirely with garbage, causing
1809                                  * `wrong cylinder' errors all over
1810                                  * the place when trying to read them
1811                                  * back.
1812                                  *
1813                                  * Umpf.
1814                                  */
1815                                 SET_BCDR(fdc, 1, bp->b_bcount, 0);
1816
1817                                 (void)fdcpio(fdc,bp->b_cmd,
1818                                         bp->b_data+fd->skip,
1819                                         bp->b_bcount);
1820
1821                         }
1822                         /* formatting */
1823                         if(fd_cmd(fdc, 6,  NE7CMD_FORMAT, head << 2 | fdu,
1824                                   finfo->fd_formb_secshift,
1825                                   finfo->fd_formb_nsecs,
1826                                   finfo->fd_formb_gaplen,
1827                                   finfo->fd_formb_fillbyte, 0)) {
1828                                 /* controller fell over */
1829                                 if (!(fdc->flags & FDC_NODMA))
1830                                         isa_dmadone(isa_dmabp(bp),
1831                                                     bp->b_data + fd->skip,
1832                                                     format ? bp->b_bcount : fdblk,
1833                                                     fdc->dmachan);
1834                                 fdc->retry = 6;
1835                                 return (retrier(fdc));
1836                         }
1837                 } else {
1838                         if (fdc->flags & FDC_NODMA) {
1839                                 /*
1840                                  * this seems to be necessary even when
1841                                  * reading data
1842                                  */
1843                                 SET_BCDR(fdc, 1, fdblk, 0);
1844
1845                                 /*
1846                                  * perform the write pseudo-DMA before
1847                                  * the WRITE command is sent
1848                                  */
1849                                 if (!read)
1850                                         (void)fdcpio(fdc,bp->b_cmd,
1851                                             bp->b_data+fd->skip,
1852                                             fdblk);
1853                         }
1854                         if (fd_cmd(fdc, 9,
1855                                    (read ? NE7CMD_READ : NE7CMD_WRITE),
1856                                    head << 2 | fdu,  /* head & unit */
1857                                    fd->track,        /* track */
1858                                    head,
1859                                    sec,              /* sector + 1 */
1860                                    fd->ft->secsize,  /* sector size */
1861                                    sectrac,          /* sectors/track */
1862                                    fd->ft->gap,      /* gap size */
1863                                    fd->ft->datalen,  /* data length */
1864                                    0)) {
1865                                 /* the beast is sleeping again */
1866                                 if (!(fdc->flags & FDC_NODMA))
1867                                         isa_dmadone(isa_dmabp(bp),
1868                                                     bp->b_data + fd->skip,
1869                                                     format ? bp->b_bcount : fdblk,
1870                                                     fdc->dmachan);
1871                                 fdc->retry = 6;
1872                                 return (retrier(fdc));
1873                         }
1874                 }
1875                 if (fdc->flags & FDC_NODMA)
1876                         /*
1877                          * if this is a read, then simply await interrupt
1878                          * before performing PIO
1879                          */
1880                         if (read && !fdcpio(fdc,bp->b_cmd,
1881                             bp->b_data+fd->skip,fdblk)) {
1882                                 callout_reset(&fd->tohandle, hz,
1883                                                 fd_iotimeout, fdc);
1884                                 return(0);      /* will return later */
1885                         };
1886
1887                 /*
1888                  * write (or format) operation will fall through and
1889                  * await completion interrupt
1890                  */
1891                 fdc->state = IOCOMPLETE;
1892                 callout_reset(&fd->tohandle, hz, fd_iotimeout, fdc);
1893                 return (0);     /* will return later */
1894         case PIOREAD:
1895                 /*
1896                  * actually perform the PIO read.  The IOCOMPLETE case
1897                  * removes the timeout for us.
1898                  */
1899                 (void)fdcpio(fdc,bp->b_cmd,bp->b_data+fd->skip,fdblk);
1900                 fdc->state = IOCOMPLETE;
1901                 /* FALLTHROUGH */
1902         case IOCOMPLETE: /* IO DONE, post-analyze */
1903                 callout_stop(&fd->tohandle);
1904
1905                 if (fd_read_status(fdc, fd->fdsu)) {
1906                         if (!(fdc->flags & FDC_NODMA)) {
1907                                 isa_dmadone(isa_dmabp(bp),
1908                                             bp->b_data + fd->skip,
1909                                             format ? bp->b_bcount : fdblk,
1910                                             fdc->dmachan);
1911                         }
1912                         if (fdc->retry < 6)
1913                                 fdc->retry = 6; /* force a reset */
1914                         return (retrier(fdc));
1915                 }
1916
1917                 fdc->state = IOTIMEDOUT;
1918
1919                 /* FALLTHROUGH */
1920
1921         case IOTIMEDOUT:
1922                 if (!(fdc->flags & FDC_NODMA)) {
1923                         isa_dmadone(isa_dmabp(bp),
1924                                     bp->b_data + fd->skip,
1925                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1926                 }
1927                 if (fdc->status[0] & NE7_ST0_IC) {
1928                         if ((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1929                             && fdc->status[1] & NE7_ST1_OR) {
1930                                 /*
1931                                  * DMA overrun. Someone hogged the bus and
1932                                  * didn't release it in time for the next
1933                                  * FDC transfer.
1934                                  *
1935                                  * We normally restart this without bumping
1936                                  * the retry counter.  However, in case
1937                                  * something is seriously messed up (like
1938                                  * broken hardware), we rather limit the
1939                                  * number of retries so the IO operation
1940                                  * doesn't block indefinately.
1941                                  */
1942                                 if (fdc->dma_overruns++ < FDC_DMAOV_MAX) {
1943                                         fdc->state = SEEKCOMPLETE;
1944                                         return (1);
1945                                 } /* else fall through */
1946                         }
1947                         if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_IV
1948                                 && fdc->retry < 6)
1949                                 fdc->retry = 6; /* force a reset */
1950                         else if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1951                                 && fdc->status[2] & NE7_ST2_WC
1952                                 && fdc->retry < 3)
1953                                 fdc->retry = 3; /* force recalibrate */
1954                         return (retrier(fdc));
1955                 }
1956                 /* All OK */
1957                 /* Operation successful, retry DMA overruns again next time. */
1958                 fdc->dma_overruns = 0;
1959                 fd->skip += fdblk;
1960                 if (!format && fd->skip < bp->b_bcount - bp->b_resid) {
1961                         /* set up next transfer */
1962                         fdc->state = DOSEEK;
1963                 } else {
1964                         /* ALL DONE */
1965                         fd->skip = 0;
1966                         fdc->bio = NULL;
1967                         device_unbusy(fd->dev);
1968                         devstat_end_transaction_buf(&fd->device_stats, bp);
1969                         biodone(bio);
1970                         fdc->fd = (fd_p) 0;
1971                         fdc->fdu = -1;
1972                         fdc->state = FINDWORK;
1973                 }
1974                 return (1);
1975         case RESETCTLR:
1976                 fdc_reset(fdc);
1977                 fdc->retry++;
1978                 fdc->state = RESETCOMPLETE;
1979                 return (0);
1980         case RESETCOMPLETE:
1981                 /*
1982                  * Discard all the results from the reset so that they
1983                  * can't cause an unexpected interrupt later.
1984                  */
1985                 for (i = 0; i < 4; i++)
1986                         (void)fd_sense_int(fdc, &st0, &cyl);
1987                 fdc->state = STARTRECAL;
1988                 /* Fall through. */
1989         case STARTRECAL:
1990                 if(fd_cmd(fdc, 2, NE7CMD_RECAL, fdu, 0)) {
1991                         /* arrgl */
1992                         fdc->retry = 6;
1993                         return (retrier(fdc));
1994                 }
1995                 fdc->state = RECALWAIT;
1996                 return (0);     /* will return later */
1997         case RECALWAIT:
1998                 /* allow heads to settle */
1999                 callout_reset(&fdc->pseudointr_ch, hz / 8, fd_pseudointr, fdc);
2000                 fdc->state = RECALCOMPLETE;
2001                 return (0);     /* will return later */
2002         case RECALCOMPLETE:
2003                 do {
2004                         /*
2005                          * See SEEKCOMPLETE for a comment on this:
2006                          */
2007                         if (fd_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
2008                                 return 0;
2009                         if(fdc->fdct == FDC_NE765
2010                            && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
2011                                 return 0; /* hope for a real intr */
2012                 } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
2013                 if ((st0 & NE7_ST0_IC) != NE7_ST0_IC_NT || cyl != 0)
2014                 {
2015                         if(fdc->retry > 3)
2016                                 /*
2017                                  * a recalibrate from beyond cylinder 77
2018                                  * will "fail" due to the FDC limitations;
2019                                  * since people used to complain much about
2020                                  * the failure message, try not logging
2021                                  * this one if it seems to be the first
2022                                  * time in a line
2023                                  */
2024                                 printf("fd%d: recal failed ST0 %b cyl %d\n",
2025                                        fdu, st0, NE7_ST0BITS, cyl);
2026                         if(fdc->retry < 3) fdc->retry = 3;
2027                         return (retrier(fdc));
2028                 }
2029                 fd->track = 0;
2030                 /* Seek (probably) necessary */
2031                 fdc->state = DOSEEK;
2032                 return (1);     /* will return immediatly */
2033         case MOTORWAIT:
2034                 if(fd->flags & FD_MOTOR_WAIT)
2035                 {
2036                         return (0); /* time's not up yet */
2037                 }
2038                 if (fdc->flags & FDC_NEEDS_RESET) {
2039                         fdc->state = RESETCTLR;
2040                         fdc->flags &= ~FDC_NEEDS_RESET;
2041                 } else {
2042                         /*
2043                          * If all motors were off, then the controller was
2044                          * reset, so it has lost track of the current
2045                          * cylinder.  Recalibrate to handle this case.
2046                          * But first, discard the results of the reset.
2047                          */
2048                         fdc->state = RESETCOMPLETE;
2049                 }
2050                 return (1);     /* will return immediatly */
2051         default:
2052                 device_printf(fdc->fdc_dev, "unexpected FD int->");
2053                 if (fd_read_status(fdc, fd->fdsu) == 0)
2054                         printf("FDC status :%x %x %x %x %x %x %x   ",
2055                                fdc->status[0],
2056                                fdc->status[1],
2057                                fdc->status[2],
2058                                fdc->status[3],
2059                                fdc->status[4],
2060                                fdc->status[5],
2061                                fdc->status[6] );
2062                 else
2063                         printf("No status available   ");
2064                 if (fd_sense_int(fdc, &st0, &cyl) != 0)
2065                 {
2066                         printf("[controller is dead now]\n");
2067                         return (0);
2068                 }
2069                 printf("ST0 = %x, PCN = %x\n", st0, cyl);
2070                 return (0);
2071         }
2072         /*XXX confusing: some branches return immediately, others end up here*/
2073         return (1); /* Come back immediatly to new state */
2074 }
2075
2076 static int
2077 retrier(struct fdc_data *fdc)
2078 {
2079         struct bio *bio;
2080         struct buf *bp;
2081         struct fd_data *fd;
2082         dev_t dev;
2083         int fdu;
2084
2085         bio = fdc->bio;
2086         bp = bio->bio_buf;
2087         dev = bio->bio_driver_info;
2088
2089         /* XXX shouldn't this be cached somewhere?  */
2090         fdu = FDUNIT(minor(dev));
2091         fd = devclass_get_softc(fd_devclass, fdu);
2092         if (fd->options & FDOPT_NORETRY)
2093                 goto fail;
2094
2095         switch (fdc->retry) {
2096         case 0: case 1: case 2:
2097                 fdc->state = SEEKCOMPLETE;
2098                 break;
2099         case 3: case 4: case 5:
2100                 fdc->state = STARTRECAL;
2101                 break;
2102         case 6:
2103                 fdc->state = RESETCTLR;
2104                 break;
2105         case 7:
2106                 break;
2107         default:
2108         fail:
2109                 {
2110                         int printerror = (fd->options & FDOPT_NOERRLOG) == 0;
2111
2112                         if (printerror) {
2113                                 /*
2114                                  * note: use the correct device for more
2115                                  * verbose error reporting.
2116                                  */
2117                                 dev_t subdev;
2118
2119                                 subdev = make_sub_dev(dev,
2120                                     (FDUNIT(minor(dev))<<3)|RAW_PART);
2121                                 diskerr(bio, subdev,
2122                                         "hard error", LOG_PRINTF,
2123                                         fdc->fd->skip, NULL);
2124                         }
2125                         if (printerror) {
2126                                 if (fdc->flags & FDC_STAT_VALID)
2127                                         printf(
2128                         " (ST0 %b ST1 %b ST2 %b cyl %u hd %u sec %u)\n",
2129                                                fdc->status[0], NE7_ST0BITS,
2130                                                fdc->status[1], NE7_ST1BITS,
2131                                                fdc->status[2], NE7_ST2BITS,
2132                                                fdc->status[3], fdc->status[4],
2133                                                fdc->status[5]);
2134                                 else
2135                                         printf(" (No status)\n");
2136                         }
2137                 }
2138                 bp->b_flags |= B_ERROR;
2139                 bp->b_error = EIO;
2140                 bp->b_resid += bp->b_bcount - fdc->fd->skip;
2141                 fdc->bio = NULL;
2142                 fdc->fd->skip = 0;
2143                 device_unbusy(fd->dev);
2144                 devstat_end_transaction_buf(&fdc->fd->device_stats, bp);
2145                 biodone(bio);
2146                 fdc->state = FINDWORK;
2147                 fdc->flags |= FDC_NEEDS_RESET;
2148                 fdc->fd = (fd_p) 0;
2149                 fdc->fdu = -1;
2150                 return (1);
2151         }
2152         fdc->retry++;
2153         return (1);
2154 }
2155
2156 static void
2157 fdformat_wakeup(struct bio *bio)
2158 {
2159         bio->bio_buf->b_cmd = BUF_CMD_DONE;
2160         wakeup(bio);
2161 }
2162
2163 static int
2164 fdformat(dev_t dev, struct fd_formb *finfo, struct ucred *cred)
2165 {
2166         fdu_t   fdu;
2167         fd_p    fd;
2168         struct buf *bp;
2169         int rv = 0;
2170         size_t fdblk;
2171
2172         fdu     = FDUNIT(minor(dev));
2173         fd      = devclass_get_softc(fd_devclass, fdu);
2174         fdblk = 128 << fd->ft->secsize;
2175
2176         /* set up a buffer header for fdstrategy() */
2177         bp = getpbuf(NULL);
2178         bp->b_cmd = BUF_CMD_FORMAT;
2179
2180         /*
2181          * calculate a fake blkno, so fdstrategy() would initiate a
2182          * seek to the requested cylinder
2183          */
2184         bp->b_bio1.bio_offset = (off_t)(finfo->cyl *
2185                 (fd->ft->sectrac * fd->ft->heads)
2186                 + finfo->head * fd->ft->sectrac) * fdblk;
2187         bp->b_bio1.bio_driver_info = dev;
2188         bp->b_bio1.bio_done = fdformat_wakeup;
2189
2190         bp->b_bcount = sizeof(struct fd_idfield_data) * finfo->fd_formb_nsecs;
2191         bp->b_data = (caddr_t)finfo;
2192
2193         /* now do the format */
2194         dev_dstrategy(dev, &bp->b_bio1);
2195
2196         /* ...and wait for it to complete */
2197         crit_enter();
2198         while (bp->b_cmd != BUF_CMD_DONE) {
2199                 rv = tsleep(&bp->b_bio1, 0, "fdform", 20 * hz);
2200                 if (rv == EWOULDBLOCK)
2201                         break;
2202         }
2203         crit_exit();
2204
2205         if (rv == EWOULDBLOCK) {
2206                 /* timed out */
2207                 rv = EIO;
2208                 device_unbusy(fd->dev);
2209                 biodone(&bp->b_bio1);
2210         }
2211         if (bp->b_flags & B_ERROR)
2212                 rv = bp->b_error;
2213         /*
2214          * allow the process to be swapped
2215          */
2216         relpbuf(bp, NULL);
2217         return rv;
2218 }
2219
2220 /*
2221  * TODO: don't allocate buffer on stack.
2222  */
2223
2224 static int
2225 fdioctl(struct dev_ioctl_args *ap)
2226 {
2227         dev_t dev = ap->a_head.a_dev;
2228         fdu_t   fdu = FDUNIT(minor(dev));
2229         fd_p    fd = devclass_get_softc(fd_devclass, fdu);
2230         size_t fdblk;
2231
2232         struct fd_type *fdt;
2233         struct disklabel *dl;
2234         struct fdc_status *fsp;
2235         char buffer[DEV_BSIZE];
2236         int error = 0;
2237
2238         fdblk = 128 << fd->ft->secsize;
2239
2240         switch (ap->a_cmd) {
2241         case DIOCGDINFO:
2242                 bzero(buffer, sizeof (buffer));
2243                 dl = (struct disklabel *)buffer;
2244                 dl->d_secsize = fdblk;
2245                 fdt = fd->ft;
2246                 dl->d_secpercyl = fdt->size / fdt->tracks;
2247                 dl->d_type = DTYPE_FLOPPY;
2248
2249                 if (readdisklabel(dev, dl)
2250                     == NULL)
2251                         error = 0;
2252                 else
2253                         error = EINVAL;
2254
2255                 *(struct disklabel *)ap->a_data = *dl;
2256                 break;
2257
2258         case DIOCSDINFO:
2259                 if ((ap->a_fflag & FWRITE) == 0)
2260                         error = EBADF;
2261                 break;
2262
2263         case DIOCWLABEL:
2264                 if ((ap->a_fflag & FWRITE) == 0)
2265                         error = EBADF;
2266                 break;
2267
2268         case DIOCWDINFO:
2269                 if ((ap->a_fflag & FWRITE) == 0) {
2270                         error = EBADF;
2271                         break;
2272                 }
2273
2274                 dl = (struct disklabel *)ap->a_data;
2275
2276                 if ((error = setdisklabel((struct disklabel *)buffer, dl,
2277                                           (u_long)0)) != 0)
2278                         break;
2279
2280                 error = writedisklabel(dev, (struct disklabel *)buffer);
2281                 break;
2282         case FD_FORM:
2283                 if ((ap->a_fflag & FWRITE) == 0)
2284                         error = EBADF;  /* must be opened for writing */
2285                 else if (((struct fd_formb *)ap->a_data)->format_version !=
2286                         FD_FORMAT_VERSION)
2287                         error = EINVAL; /* wrong version of formatting prog */
2288                 else
2289                         error = fdformat(dev, (struct fd_formb *)ap->a_data, ap->a_cred);
2290                 break;
2291
2292         case FD_GTYPE:                  /* get drive type */
2293                 *(struct fd_type *)ap->a_data = *fd->ft;
2294                 break;
2295
2296         case FD_STYPE:                  /* set drive type */
2297                 /* this is considered harmful; only allow for superuser */
2298                 if (suser_cred(ap->a_cred, 0) != 0)
2299                         return EPERM;
2300                 *fd->ft = *(struct fd_type *)ap->a_data;
2301                 break;
2302
2303         case FD_GOPTS:                  /* get drive options */
2304                 *(int *)ap->a_data = fd->options;
2305                 break;
2306
2307         case FD_SOPTS:                  /* set drive options */
2308                 fd->options = *(int *)ap->a_data;
2309                 break;
2310
2311         case FD_GSTAT:
2312                 fsp = (struct fdc_status *)ap->a_data;
2313                 if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
2314                         return EINVAL;
2315                 memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
2316                 break;
2317
2318         default:
2319                 error = ENOTTY;
2320                 break;
2321         }
2322         return (error);
2323 }
2324
2325 /*
2326  * Hello emacs, these are the
2327  * Local Variables:
2328  *  c-indent-level:               8
2329  *  c-continued-statement-offset: 8
2330  *  c-continued-brace-offset:     0
2331  *  c-brace-offset:              -8
2332  *  c-brace-imaginary-offset:     0
2333  *  c-argdecl-indent:             8
2334  *  c-label-offset:              -8
2335  *  c++-hanging-braces:           1
2336  *  c++-access-specifier-offset: -8
2337  *  c++-empty-arglist-indent:     8
2338  *  c++-friend-offset:            0
2339  * End:
2340  */