The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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sys/dev/fdc/fdc.c

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    1 /*-
    2  * Copyright (c) 2004 Poul-Henning Kamp
    3  * Copyright (c) 1990 The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * Don Ahn.
    8  *
    9  * Libretto PCMCIA floppy support by David Horwitt (dhorwitt@ucsd.edu)
   10  * aided by the Linux floppy driver modifications from David Bateman
   11  * (dbateman@eng.uts.edu.au).
   12  *
   13  * Copyright (c) 1993, 1994 by
   14  *  jc@irbs.UUCP (John Capo)
   15  *  vak@zebub.msk.su (Serge Vakulenko)
   16  *  ache@astral.msk.su (Andrew A. Chernov)
   17  *
   18  * Copyright (c) 1993, 1994, 1995 by
   19  *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
   20  *  dufault@hda.com (Peter Dufault)
   21  *
   22  * Copyright (c) 2001 Joerg Wunsch,
   23  *  joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
   24  *
   25  * Redistribution and use in source and binary forms, with or without
   26  * modification, are permitted provided that the following conditions
   27  * are met:
   28  * 1. Redistributions of source code must retain the above copyright
   29  *    notice, this list of conditions and the following disclaimer.
   30  * 2. Redistributions in binary form must reproduce the above copyright
   31  *    notice, this list of conditions and the following disclaimer in the
   32  *    documentation and/or other materials provided with the distribution.
   33  * 4. Neither the name of the University nor the names of its contributors
   34  *    may be used to endorse or promote products derived from this software
   35  *    without specific prior written permission.
   36  *
   37  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   38  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   39  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   40  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   41  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   42  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   43  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   45  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   46  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   47  * SUCH DAMAGE.
   48  *
   49  *      from:   @(#)fd.c        7.4 (Berkeley) 5/25/91
   50  *
   51  */
   52 
   53 #include <sys/cdefs.h>
   54 __FBSDID("$FreeBSD: releng/8.3/sys/dev/fdc/fdc.c 218992 2011-02-24 10:23:22Z brucec $");
   55 
   56 #include "opt_fdc.h"
   57 
   58 #include <sys/param.h>
   59 #include <sys/bio.h>
   60 #include <sys/bus.h>
   61 #include <sys/devicestat.h>
   62 #include <sys/disk.h>
   63 #include <sys/fcntl.h>
   64 #include <sys/fdcio.h>
   65 #include <sys/filio.h>
   66 #include <sys/kernel.h>
   67 #include <sys/kthread.h>
   68 #include <sys/lock.h>
   69 #include <sys/malloc.h>
   70 #include <sys/module.h>
   71 #include <sys/mutex.h>
   72 #include <sys/priv.h>
   73 #include <sys/proc.h>
   74 #include <sys/rman.h>
   75 #include <sys/sysctl.h>
   76 #include <sys/systm.h>
   77 
   78 #include <geom/geom.h>
   79 
   80 #include <machine/bus.h>
   81 #include <machine/clock.h>
   82 #include <machine/stdarg.h>
   83 
   84 #include <isa/isavar.h>
   85 #include <isa/isareg.h>
   86 #include <dev/fdc/fdcvar.h>
   87 #include <isa/rtc.h>
   88 
   89 #include <dev/ic/nec765.h>
   90 
   91 /*
   92  * Runtime configuration hints/flags
   93  */
   94 
   95 /* configuration flags for fd */
   96 #define FD_TYPEMASK     0x0f    /* drive type, matches enum
   97                                  * fd_drivetype; on i386 machines, if
   98                                  * given as 0, use RTC type for fd0
   99                                  * and fd1 */
  100 #define FD_NO_CHLINE    0x10    /* drive does not support changeline
  101                                  * aka. unit attention */
  102 #define FD_NO_PROBE     0x20    /* don't probe drive (seek test), just
  103                                  * assume it is there */
  104 
  105 /*
  106  * Things that could conceiveably considered parameters or tweakables
  107  */
  108 
  109 /*
  110  * Maximal number of bytes in a cylinder.
  111  * This is used for ISADMA bouncebuffer allocation and sets the max
  112  * xfersize we support.
  113  *
  114  * 2.88M format has 2 x 36 x 512, allow for hacked up density.
  115  */
  116 #define MAX_BYTES_PER_CYL       (2 * 40 * 512)
  117 
  118 /*
  119  * Timeout value for the PIO loops to wait until the FDC main status
  120  * register matches our expectations (request for master, direction
  121  * bit).  This is supposed to be a number of microseconds, although
  122  * timing might actually not be very accurate.
  123  *
  124  * Timeouts of 100 msec are believed to be required for some broken
  125  * (old) hardware.
  126  */
  127 #define FDSTS_TIMEOUT   100000
  128 
  129 /*
  130  * After this many errors, stop whining.  Close will reset this count.
  131  */
  132 #define FDC_ERRMAX      100
  133 
  134 /*
  135  * AutoDensity search lists for each drive type.
  136  */
  137 
  138 static struct fd_type fd_searchlist_360k[] = {
  139         { FDF_5_360 },
  140         { 0 }
  141 };
  142 
  143 static struct fd_type fd_searchlist_12m[] = {
  144         { FDF_5_1200 | FL_AUTO },
  145         { FDF_5_360 | FL_2STEP | FL_AUTO},
  146         { 0 }
  147 };
  148 
  149 static struct fd_type fd_searchlist_720k[] = {
  150         { FDF_3_720 },
  151         { 0 }
  152 };
  153 
  154 static struct fd_type fd_searchlist_144m[] = {
  155         { FDF_3_1440 | FL_AUTO},
  156         { FDF_3_720 | FL_AUTO},
  157         { 0 }
  158 };
  159 
  160 static struct fd_type fd_searchlist_288m[] = {
  161         { FDF_3_1440 | FL_AUTO },
  162 #if 0
  163         { FDF_3_2880 | FL_AUTO }, /* XXX: probably doesn't work */
  164 #endif
  165         { FDF_3_720 | FL_AUTO},
  166         { 0 }
  167 };
  168 
  169 /*
  170  * Order must match enum fd_drivetype in <sys/fdcio.h>.
  171  */
  172 static struct fd_type *fd_native_types[] = {
  173         NULL,                           /* FDT_NONE */
  174         fd_searchlist_360k,             /* FDT_360K */
  175         fd_searchlist_12m,              /* FDT_12M */
  176         fd_searchlist_720k,             /* FDT_720K */
  177         fd_searchlist_144m,             /* FDT_144M */
  178         fd_searchlist_288m,             /* FDT_288M_1 (mapped to FDT_288M) */
  179         fd_searchlist_288m,             /* FDT_288M */
  180 };
  181 
  182 /*
  183  * Internals start here
  184  */
  185 
  186 /* registers */
  187 #define FDOUT   2       /* Digital Output Register (W) */
  188 #define FDO_FDSEL       0x03    /*  floppy device select */
  189 #define FDO_FRST        0x04    /*  floppy controller reset */
  190 #define FDO_FDMAEN      0x08    /*  enable floppy DMA and Interrupt */
  191 #define FDO_MOEN0       0x10    /*  motor enable drive 0 */
  192 #define FDO_MOEN1       0x20    /*  motor enable drive 1 */
  193 #define FDO_MOEN2       0x40    /*  motor enable drive 2 */
  194 #define FDO_MOEN3       0x80    /*  motor enable drive 3 */
  195 
  196 #define FDSTS   4       /* NEC 765 Main Status Register (R) */
  197 #define FDDSR   4       /* Data Rate Select Register (W) */
  198 #define FDDATA  5       /* NEC 765 Data Register (R/W) */
  199 #define FDCTL   7       /* Control Register (W) */
  200 
  201 /*
  202  * The YE-DATA PC Card floppies use PIO to read in the data rather
  203  * than DMA due to the wild variability of DMA for the PC Card
  204  * devices.  DMA was deleted from the PC Card specification in version
  205  * 7.2 of the standard, but that post-dates the YE-DATA devices by many
  206  * years.
  207  *
  208  * In addition, if we cannot setup the DMA resources for the ISA
  209  * attachment, we'll use this same offset for data transfer.  However,
  210  * that almost certainly won't work.
  211  *
  212  * For this mode, offset 0 and 1 must be used to setup the transfer
  213  * for this floppy.  This is OK for PC Card YE Data devices, but for
  214  * ISA this is likely wrong.  These registers are only available on
  215  * those systems that map them to the floppy drive.  Newer systems do
  216  * not do this, and we should likely prohibit access to them (or
  217  * disallow NODMA to be set).
  218  */
  219 #define FDBCDR          0       /* And 1 */
  220 #define FD_YE_DATAPORT  6       /* Drive Data port */
  221 
  222 #define FDI_DCHG        0x80    /* diskette has been changed */
  223                                 /* requires drive and motor being selected */
  224                                 /* is cleared by any step pulse to drive */
  225 
  226 /*
  227  * We have three private BIO commands.
  228  */
  229 #define BIO_PROBE       BIO_CMD0
  230 #define BIO_RDID        BIO_CMD1
  231 #define BIO_FMT         BIO_CMD2
  232 
  233 /*
  234  * Per drive structure (softc).
  235  */
  236 struct fd_data {
  237         u_char  *fd_ioptr;      /* IO pointer */
  238         u_int   fd_iosize;      /* Size of IO chunks */
  239         u_int   fd_iocount;     /* Outstanding requests */
  240         struct  fdc_data *fdc;  /* pointer to controller structure */
  241         int     fdsu;           /* this units number on this controller */
  242         enum    fd_drivetype type; /* drive type */
  243         struct  fd_type *ft;    /* pointer to current type descriptor */
  244         struct  fd_type fts;    /* type descriptors */
  245         int     sectorsize;
  246         int     flags;
  247 #define FD_WP           (1<<0)  /* Write protected      */
  248 #define FD_MOTOR        (1<<1)  /* motor should be on   */
  249 #define FD_MOTORWAIT    (1<<2)  /* motor should be on   */
  250 #define FD_EMPTY        (1<<3)  /* no media             */
  251 #define FD_NEWDISK      (1<<4)  /* media changed        */
  252 #define FD_ISADMA       (1<<5)  /* isa dma started      */
  253         int     track;          /* where we think the head is */
  254 #define FD_NO_TRACK      -2
  255         int     options;        /* FDOPT_* */
  256         struct  callout toffhandle;
  257         struct g_geom *fd_geom;
  258         struct g_provider *fd_provider;
  259         device_t dev;
  260         struct bio_queue_head fd_bq;
  261 };
  262 
  263 #define FD_NOT_VALID -2
  264 
  265 static driver_intr_t fdc_intr;
  266 static driver_filter_t fdc_intr_fast;
  267 static void fdc_reset(struct fdc_data *);
  268 static int fd_probe_disk(struct fd_data *, int *);
  269 
  270 SYSCTL_NODE(_debug, OID_AUTO, fdc, CTLFLAG_RW, 0, "fdc driver");
  271 
  272 static int fifo_threshold = 8;
  273 SYSCTL_INT(_debug_fdc, OID_AUTO, fifo, CTLFLAG_RW, &fifo_threshold, 0,
  274         "FIFO threshold setting");
  275 
  276 static int debugflags = 0;
  277 SYSCTL_INT(_debug_fdc, OID_AUTO, debugflags, CTLFLAG_RW, &debugflags, 0,
  278         "Debug flags");
  279 
  280 static int retries = 10;
  281 SYSCTL_INT(_debug_fdc, OID_AUTO, retries, CTLFLAG_RW, &retries, 0,
  282         "Number of retries to attempt");
  283 
  284 static int spec1 = 0xaf;
  285 SYSCTL_INT(_debug_fdc, OID_AUTO, spec1, CTLFLAG_RW, &spec1, 0,
  286         "Specification byte one (step-rate + head unload)");
  287 
  288 static int spec2 = 0x10;
  289 SYSCTL_INT(_debug_fdc, OID_AUTO, spec2, CTLFLAG_RW, &spec2, 0,
  290         "Specification byte two (head load time + no-dma)");
  291 
  292 static int settle;
  293 SYSCTL_INT(_debug_fdc, OID_AUTO, settle, CTLFLAG_RW, &settle, 0,
  294         "Head settling time in sec/hz");
  295 
  296 static void
  297 fdprinttype(struct fd_type *ft)
  298 {
  299 
  300         printf("(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,0x%x)",
  301             ft->sectrac, ft->secsize, ft->datalen, ft->gap, ft->tracks,
  302             ft->size, ft->trans, ft->heads, ft->f_gap, ft->f_inter,
  303             ft->offset_side2, ft->flags);
  304 }
  305 
  306 static void
  307 fdsettype(struct fd_data *fd, struct fd_type *ft)
  308 {
  309         fd->ft = ft;
  310         ft->size = ft->sectrac * ft->heads * ft->tracks;
  311         fd->sectorsize = 128 << fd->ft->secsize;
  312 }
  313 
  314 /*
  315  * Bus space handling (access to low-level IO).
  316  */
  317 __inline static void
  318 fdregwr(struct fdc_data *fdc, int reg, uint8_t v)
  319 {
  320 
  321         bus_space_write_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg], v);
  322 }
  323 
  324 __inline static uint8_t
  325 fdregrd(struct fdc_data *fdc, int reg)
  326 {
  327 
  328         return bus_space_read_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg]);
  329 }
  330 
  331 static void
  332 fdctl_wr(struct fdc_data *fdc, u_int8_t v)
  333 {
  334 
  335         fdregwr(fdc, FDCTL, v);
  336 }
  337 
  338 static void
  339 fdout_wr(struct fdc_data *fdc, u_int8_t v)
  340 {
  341 
  342         fdregwr(fdc, FDOUT, v);
  343 }
  344 
  345 static u_int8_t
  346 fdsts_rd(struct fdc_data *fdc)
  347 {
  348 
  349         return fdregrd(fdc, FDSTS);
  350 }
  351 
  352 static void
  353 fddsr_wr(struct fdc_data *fdc, u_int8_t v)
  354 {
  355 
  356         fdregwr(fdc, FDDSR, v);
  357 }
  358 
  359 static void
  360 fddata_wr(struct fdc_data *fdc, u_int8_t v)
  361 {
  362 
  363         fdregwr(fdc, FDDATA, v);
  364 }
  365 
  366 static u_int8_t
  367 fddata_rd(struct fdc_data *fdc)
  368 {
  369 
  370         return fdregrd(fdc, FDDATA);
  371 }
  372 
  373 static u_int8_t
  374 fdin_rd(struct fdc_data *fdc)
  375 {
  376 
  377         return fdregrd(fdc, FDCTL);
  378 }
  379 
  380 /*
  381  * Magic pseudo-DMA initialization for YE FDC. Sets count and
  382  * direction.
  383  */
  384 static void
  385 fdbcdr_wr(struct fdc_data *fdc, int iswrite, uint16_t count)
  386 {
  387         fdregwr(fdc, FDBCDR, (count - 1) & 0xff);
  388         fdregwr(fdc, FDBCDR + 1,
  389             (iswrite ? 0x80 : 0) | (((count - 1) >> 8) & 0x7f));
  390 }
  391 
  392 static int
  393 fdc_err(struct fdc_data *fdc, const char *s)
  394 {
  395         fdc->fdc_errs++;
  396         if (s) {
  397                 if (fdc->fdc_errs < FDC_ERRMAX)
  398                         device_printf(fdc->fdc_dev, "%s", s);
  399                 else if (fdc->fdc_errs == FDC_ERRMAX)
  400                         device_printf(fdc->fdc_dev, "too many errors, not "
  401                                                     "logging any more\n");
  402         }
  403 
  404         return (1);
  405 }
  406 
  407 /*
  408  * FDC IO functions, take care of the main status register, timeout
  409  * in case the desired status bits are never set.
  410  *
  411  * These PIO loops initially start out with short delays between
  412  * each iteration in the expectation that the required condition
  413  * is usually met quickly, so it can be handled immediately.
  414  */
  415 static int
  416 fdc_in(struct fdc_data *fdc, int *ptr)
  417 {
  418         int i, j, step;
  419 
  420         step = 1;
  421         for (j = 0; j < FDSTS_TIMEOUT; j += step) {
  422                 i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
  423                 if (i == (NE7_DIO|NE7_RQM)) {
  424                         i = fddata_rd(fdc);
  425                         if (ptr)
  426                                 *ptr = i;
  427                         return (0);
  428                 }
  429                 if (i == NE7_RQM)
  430                         return (fdc_err(fdc, "ready for output in input\n"));
  431                 step += step;
  432                 DELAY(step);
  433         }
  434         return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
  435 }
  436 
  437 static int
  438 fdc_out(struct fdc_data *fdc, int x)
  439 {
  440         int i, j, step;
  441 
  442         step = 1;
  443         for (j = 0; j < FDSTS_TIMEOUT; j += step) {
  444                 i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
  445                 if (i == NE7_RQM) {
  446                         fddata_wr(fdc, x);
  447                         return (0);
  448                 }
  449                 if (i == (NE7_DIO|NE7_RQM))
  450                         return (fdc_err(fdc, "ready for input in output\n"));
  451                 step += step;
  452                 DELAY(step);
  453         }
  454         return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
  455 }
  456 
  457 /*
  458  * fdc_cmd: Send a command to the chip.
  459  * Takes a varargs with this structure:
  460  *      # of output bytes
  461  *      output bytes as int [...]
  462  *      # of input bytes
  463  *      input bytes as int* [...]
  464  */
  465 static int
  466 fdc_cmd(struct fdc_data *fdc, int n_out, ...)
  467 {
  468         u_char cmd = 0;
  469         int n_in;
  470         int n, i;
  471         va_list ap;
  472 
  473         va_start(ap, n_out);
  474         for (n = 0; n < n_out; n++) {
  475                 i = va_arg(ap, int);
  476                 if (n == 0)
  477                         cmd = i;
  478                 if (fdc_out(fdc, i) < 0) {
  479                         char msg[50];
  480                         snprintf(msg, sizeof(msg),
  481                                 "cmd %x failed at out byte %d of %d\n",
  482                                 cmd, n + 1, n_out);
  483                         fdc->flags |= FDC_NEEDS_RESET;
  484                         va_end(ap);
  485                         return fdc_err(fdc, msg);
  486                 }
  487         }
  488         n_in = va_arg(ap, int);
  489         for (n = 0; n < n_in; n++) {
  490                 int *ptr = va_arg(ap, int *);
  491                 if (fdc_in(fdc, ptr) < 0) {
  492                         char msg[50];
  493                         snprintf(msg, sizeof(msg),
  494                                 "cmd %02x failed at in byte %d of %d\n",
  495                                 cmd, n + 1, n_in);
  496                         fdc->flags |= FDC_NEEDS_RESET;
  497                         va_end(ap);
  498                         return fdc_err(fdc, msg);
  499                 }
  500         }
  501         va_end(ap);
  502         return (0);
  503 }
  504 
  505 static void
  506 fdc_reset(struct fdc_data *fdc)
  507 {
  508         int i, r[10];
  509 
  510         if (fdc->fdct == FDC_ENHANCED) {
  511                 /* Try a software reset, default precomp, and 500 kb/s */
  512                 fddsr_wr(fdc, I8207X_DSR_SR);
  513         } else {
  514                 /* Try a hardware reset, keep motor on */
  515                 fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
  516                 DELAY(100);
  517                 /* enable FDC, but defer interrupts a moment */
  518                 fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
  519         }
  520         DELAY(100);
  521         fdout_wr(fdc, fdc->fdout);
  522 
  523         /* XXX after a reset, silently believe the FDC will accept commands */
  524         if (fdc_cmd(fdc, 3, NE7CMD_SPECIFY, spec1, spec2, 0))
  525                 device_printf(fdc->fdc_dev, " SPECIFY failed in reset\n");
  526 
  527         if (fdc->fdct == FDC_ENHANCED) {
  528                 if (fdc_cmd(fdc, 4,
  529                     I8207X_CONFIG,
  530                     0,
  531                     0x40 |                      /* Enable Implied Seek */
  532                     0x10 |                      /* Polling disabled */
  533                     (fifo_threshold - 1),       /* Fifo threshold */
  534                     0x00,                       /* Precomp track */
  535                     0))
  536                         device_printf(fdc->fdc_dev,
  537                             " CONFIGURE failed in reset\n");
  538                 if (debugflags & 1) {
  539                         if (fdc_cmd(fdc, 1,
  540                             I8207X_DUMPREG,
  541                             10, &r[0], &r[1], &r[2], &r[3], &r[4],
  542                             &r[5], &r[6], &r[7], &r[8], &r[9]))
  543                                 device_printf(fdc->fdc_dev,
  544                                     " DUMPREG failed in reset\n");
  545                         for (i = 0; i < 10; i++)
  546                                 printf(" %02x", r[i]);
  547                         printf("\n");
  548                 }
  549         }
  550 }
  551 
  552 static int
  553 fdc_sense_drive(struct fdc_data *fdc, int *st3p)
  554 {
  555         int st3;
  556 
  557         if (fdc_cmd(fdc, 2, NE7CMD_SENSED, fdc->fd->fdsu, 1, &st3))
  558                 return (fdc_err(fdc, "Sense Drive Status failed\n"));
  559         if (st3p)
  560                 *st3p = st3;
  561         return (0);
  562 }
  563 
  564 static int
  565 fdc_sense_int(struct fdc_data *fdc, int *st0p, int *cylp)
  566 {
  567         int cyl, st0, ret;
  568 
  569         ret = fdc_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
  570         if (ret) {
  571                 (void)fdc_err(fdc, "sense intr err reading stat reg 0\n");
  572                 return (ret);
  573         }
  574 
  575         if (st0p)
  576                 *st0p = st0;
  577 
  578         if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
  579                 /*
  580                  * There doesn't seem to have been an interrupt.
  581                  */
  582                 return (FD_NOT_VALID);
  583         }
  584 
  585         if (fdc_in(fdc, &cyl) < 0)
  586                 return fdc_err(fdc, "can't get cyl num\n");
  587 
  588         if (cylp)
  589                 *cylp = cyl;
  590 
  591         return (0);
  592 }
  593 
  594 static int
  595 fdc_read_status(struct fdc_data *fdc)
  596 {
  597         int i, ret, status;
  598 
  599         for (i = ret = 0; i < 7; i++) {
  600                 ret = fdc_in(fdc, &status);
  601                 fdc->status[i] = status;
  602                 if (ret != 0)
  603                         break;
  604         }
  605 
  606         if (ret == 0)
  607                 fdc->flags |= FDC_STAT_VALID;
  608         else
  609                 fdc->flags &= ~FDC_STAT_VALID;
  610 
  611         return ret;
  612 }
  613 
  614 /*
  615  * Select this drive
  616  */
  617 static void
  618 fd_select(struct fd_data *fd)
  619 {
  620         struct fdc_data *fdc;
  621 
  622         /* XXX: lock controller */
  623         fdc = fd->fdc;
  624         fdc->fdout &= ~FDO_FDSEL;
  625         fdc->fdout |= FDO_FDMAEN | FDO_FRST | fd->fdsu;
  626         fdout_wr(fdc, fdc->fdout);
  627 }
  628 
  629 static void
  630 fd_turnon(void *arg)
  631 {
  632         struct fd_data *fd;
  633         struct bio *bp;
  634         int once;
  635 
  636         fd = arg;
  637         mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
  638         fd->flags &= ~FD_MOTORWAIT;
  639         fd->flags |= FD_MOTOR;
  640         once = 0;
  641         for (;;) {
  642                 bp = bioq_takefirst(&fd->fd_bq);
  643                 if (bp == NULL)
  644                         break;
  645                 bioq_disksort(&fd->fdc->head, bp);
  646                 once = 1;
  647         }
  648         if (once)
  649                 wakeup(&fd->fdc->head);
  650 }
  651 
  652 static void
  653 fd_motor(struct fd_data *fd, int turnon)
  654 {
  655         struct fdc_data *fdc;
  656 
  657         fdc = fd->fdc;
  658 /*
  659         mtx_assert(&fdc->fdc_mtx, MA_OWNED);
  660 */
  661         if (turnon) {
  662                 fd->flags |= FD_MOTORWAIT;
  663                 fdc->fdout |= (FDO_MOEN0 << fd->fdsu);
  664                 callout_reset(&fd->toffhandle, hz, fd_turnon, fd);
  665         } else {
  666                 callout_stop(&fd->toffhandle);
  667                 fd->flags &= ~(FD_MOTOR|FD_MOTORWAIT);
  668                 fdc->fdout &= ~(FDO_MOEN0 << fd->fdsu);
  669         }
  670         fdout_wr(fdc, fdc->fdout);
  671 }
  672 
  673 static void
  674 fd_turnoff(void *xfd)
  675 {
  676         struct fd_data *fd = xfd;
  677 
  678         mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
  679         fd_motor(fd, 0);
  680 }
  681 
  682 /*
  683  * fdc_intr - wake up the worker thread.
  684  */
  685 
  686 static void
  687 fdc_intr(void *arg)
  688 {
  689 
  690         wakeup(arg);
  691 }
  692 
  693 static int
  694 fdc_intr_fast(void *arg)
  695 {
  696 
  697         wakeup(arg);
  698         return(FILTER_HANDLED);
  699 }
  700 
  701 /*
  702  * fdc_pio(): perform programmed IO read/write for YE PCMCIA floppy.
  703  */
  704 static void
  705 fdc_pio(struct fdc_data *fdc)
  706 {
  707         u_char *cptr;
  708         struct bio *bp;
  709         u_int count;
  710 
  711         bp = fdc->bp;
  712         cptr = fdc->fd->fd_ioptr;
  713         count = fdc->fd->fd_iosize;
  714 
  715         if (bp->bio_cmd == BIO_READ) {
  716                 fdbcdr_wr(fdc, 0, count);
  717                 bus_space_read_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
  718                     fdc->ioff[FD_YE_DATAPORT], cptr, count);
  719         } else {
  720                 bus_space_write_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
  721                     fdc->ioff[FD_YE_DATAPORT], cptr, count);
  722                 fdbcdr_wr(fdc, 0, count);       /* needed? */
  723         }
  724 }
  725 
  726 static int
  727 fdc_biodone(struct fdc_data *fdc, int error)
  728 {
  729         struct fd_data *fd;
  730         struct bio *bp;
  731 
  732         fd = fdc->fd;
  733         bp = fdc->bp;
  734 
  735         mtx_lock(&fdc->fdc_mtx);
  736         if (--fd->fd_iocount == 0)
  737                 callout_reset(&fd->toffhandle, 4 * hz, fd_turnoff, fd);
  738         fdc->bp = NULL;
  739         fdc->fd = NULL;
  740         mtx_unlock(&fdc->fdc_mtx);
  741         if (bp->bio_to != NULL) {
  742                 if ((debugflags & 2) && fd->fdc->retry > 0)
  743                         printf("retries: %d\n", fd->fdc->retry);
  744                 g_io_deliver(bp, error);
  745                 return (0);
  746         }
  747         bp->bio_error = error;
  748         bp->bio_flags |= BIO_DONE;
  749         wakeup(bp);
  750         return (0);
  751 }
  752 
  753 static int retry_line;
  754 
  755 static int
  756 fdc_worker(struct fdc_data *fdc)
  757 {
  758         struct fd_data *fd;
  759         struct bio *bp;
  760         int i, nsect;
  761         int st0, st3, cyl, mfm, steptrac, cylinder, descyl, sec;
  762         int head;
  763         static int need_recal;
  764         struct fdc_readid *idp;
  765         struct fd_formb *finfo;
  766 
  767         /* Have we exhausted our retries ? */
  768         bp = fdc->bp;
  769         fd = fdc->fd;
  770         if (bp != NULL &&
  771                 (fdc->retry >= retries || (fd->options & FDOPT_NORETRY))) {
  772                 if ((debugflags & 4))
  773                         printf("Too many retries (EIO)\n");
  774                 if (fdc->flags & FDC_NEEDS_RESET) {
  775                         mtx_lock(&fdc->fdc_mtx);
  776                         fd->flags |= FD_EMPTY;
  777                         mtx_unlock(&fdc->fdc_mtx);
  778                 }
  779                 return (fdc_biodone(fdc, EIO));
  780         }
  781 
  782         /* Disable ISADMA if we bailed while it was active */
  783         if (fd != NULL && (fd->flags & FD_ISADMA)) {
  784                 mtx_lock(&Giant);
  785                 isa_dmadone(
  786                     bp->bio_cmd & BIO_READ ? ISADMA_READ : ISADMA_WRITE,
  787                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
  788                 mtx_unlock(&Giant);
  789                 mtx_lock(&fdc->fdc_mtx);
  790                 fd->flags &= ~FD_ISADMA;
  791                 mtx_unlock(&fdc->fdc_mtx);
  792         }
  793 
  794         /* Unwedge the controller ? */
  795         if (fdc->flags & FDC_NEEDS_RESET) {
  796                 fdc->flags &= ~FDC_NEEDS_RESET;
  797                 fdc_reset(fdc);
  798                 tsleep(fdc, PRIBIO, "fdcrst", hz);
  799                 /* Discard results */
  800                 for (i = 0; i < 4; i++)
  801                         fdc_sense_int(fdc, &st0, &cyl);
  802                 /* All drives must recal */
  803                 need_recal = 0xf;
  804         }
  805 
  806         /* Pick up a request, if need be wait for it */
  807         if (fdc->bp == NULL) {
  808                 mtx_lock(&fdc->fdc_mtx);
  809                 do {
  810                         fdc->bp = bioq_takefirst(&fdc->head);
  811                         if (fdc->bp == NULL)
  812                                 msleep(&fdc->head, &fdc->fdc_mtx,
  813                                     PRIBIO, "-", hz);
  814                 } while (fdc->bp == NULL &&
  815                     (fdc->flags & FDC_KTHREAD_EXIT) == 0);
  816                 mtx_unlock(&fdc->fdc_mtx);
  817 
  818                 if (fdc->bp == NULL)
  819                         /*
  820                          * Nothing to do, worker thread has been
  821                          * requested to stop.
  822                          */
  823                         return (0);
  824 
  825                 bp = fdc->bp;
  826                 fd = fdc->fd = bp->bio_driver1;
  827                 fdc->retry = 0;
  828                 fd->fd_ioptr = bp->bio_data;
  829                 if (bp->bio_cmd & BIO_FMT) {
  830                         i = offsetof(struct fd_formb, fd_formb_cylno(0));
  831                         fd->fd_ioptr += i;
  832                         fd->fd_iosize = bp->bio_length - i;
  833                 }
  834         }
  835 
  836         /* Select drive, setup params */
  837         fd_select(fd);
  838         if (fdc->fdct == FDC_ENHANCED)
  839                 fddsr_wr(fdc, fd->ft->trans);
  840         else
  841                 fdctl_wr(fdc, fd->ft->trans);
  842 
  843         if (bp->bio_cmd & BIO_PROBE) {
  844                 if ((!(device_get_flags(fd->dev) & FD_NO_CHLINE) &&
  845                     !(fdin_rd(fdc) & FDI_DCHG) &&
  846                     !(fd->flags & FD_EMPTY)) ||
  847                     fd_probe_disk(fd, &need_recal) == 0)
  848                         return (fdc_biodone(fdc, 0));
  849                 return (1);
  850         }
  851 
  852         /*
  853          * If we are dead just flush the requests
  854          */
  855         if (fd->flags & FD_EMPTY)
  856                 return (fdc_biodone(fdc, ENXIO));
  857 
  858         /* Check if we lost our media */
  859         if (fdin_rd(fdc) & FDI_DCHG) {
  860                 if (debugflags & 0x40)
  861                         printf("Lost disk\n");
  862                 mtx_lock(&fdc->fdc_mtx);
  863                 fd->flags |= FD_EMPTY;
  864                 fd->flags |= FD_NEWDISK;
  865                 mtx_unlock(&fdc->fdc_mtx);
  866                 g_topology_lock();
  867                 g_orphan_provider(fd->fd_provider, ENXIO);
  868                 fd->fd_provider->flags |= G_PF_WITHER;
  869                 fd->fd_provider =
  870                     g_new_providerf(fd->fd_geom, fd->fd_geom->name);
  871                 g_error_provider(fd->fd_provider, 0);
  872                 g_topology_unlock();
  873                 return (fdc_biodone(fdc, ENXIO));
  874         }
  875 
  876         /* Check if the floppy is write-protected */
  877         if(bp->bio_cmd & (BIO_FMT | BIO_WRITE)) {
  878                 retry_line = __LINE__;
  879                 if(fdc_sense_drive(fdc, &st3) != 0)
  880                         return (1);
  881                 if(st3 & NE7_ST3_WP)
  882                         return (fdc_biodone(fdc, EROFS));
  883         }
  884 
  885         mfm = (fd->ft->flags & FL_MFM)? NE7CMD_MFM: 0;
  886         steptrac = (fd->ft->flags & FL_2STEP)? 2: 1;
  887         i = fd->ft->sectrac * fd->ft->heads;
  888         cylinder = bp->bio_pblkno / i;
  889         descyl = cylinder * steptrac;
  890         sec = bp->bio_pblkno % i;
  891         nsect = i - sec;
  892         head = sec / fd->ft->sectrac;
  893         sec = sec % fd->ft->sectrac + 1;
  894 
  895         /* If everything is going swimmingly, use multisector xfer */
  896         if (fdc->retry == 0 && bp->bio_cmd & (BIO_READ|BIO_WRITE)) {
  897                 fd->fd_iosize = imin(nsect * fd->sectorsize, bp->bio_resid);
  898                 nsect = fd->fd_iosize / fd->sectorsize;
  899         } else if (bp->bio_cmd & (BIO_READ|BIO_WRITE)) {
  900                 fd->fd_iosize = fd->sectorsize;
  901                 nsect = 1;
  902         }
  903 
  904         /* Do RECAL if we need to or are going to track zero anyway */
  905         if ((need_recal & (1 << fd->fdsu)) ||
  906             (cylinder == 0 && fd->track != 0) ||
  907             fdc->retry > 2) {
  908                 retry_line = __LINE__;
  909                 if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
  910                         return (1);
  911                 tsleep(fdc, PRIBIO, "fdrecal", hz);
  912                 retry_line = __LINE__;
  913                 if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
  914                         return (1); /* XXX */
  915                 retry_line = __LINE__;
  916                 if ((st0 & 0xc0) || cyl != 0)
  917                         return (1);
  918                 need_recal &= ~(1 << fd->fdsu);
  919                 fd->track = 0;
  920                 /* let the heads settle */
  921                 if (settle)
  922                         tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
  923         }
  924 
  925         /*
  926          * SEEK to where we want to be
  927          *
  928          * Enhanced controllers do implied seeks for read&write as long as
  929          * we do not need multiple steps per track.
  930          */
  931         if (cylinder != fd->track && (
  932             fdc->fdct != FDC_ENHANCED ||
  933             descyl != cylinder ||
  934             (bp->bio_cmd & (BIO_RDID|BIO_FMT)))) {
  935                 retry_line = __LINE__;
  936                 if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, descyl, 0))
  937                         return (1);
  938                 tsleep(fdc, PRIBIO, "fdseek", hz);
  939                 retry_line = __LINE__;
  940                 if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
  941                         return (1); /* XXX */
  942                 retry_line = __LINE__;
  943                 if ((st0 & 0xc0) || cyl != descyl) {
  944                         need_recal |= (1 << fd->fdsu);
  945                         return (1);
  946                 }
  947                 /* let the heads settle */
  948                 if (settle)
  949                         tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
  950         }
  951         fd->track = cylinder;
  952 
  953         if (debugflags & 8)
  954                 printf("op %x bn %ju siz %u ptr %p retry %d\n",
  955                     bp->bio_cmd, bp->bio_pblkno, fd->fd_iosize,
  956                     fd->fd_ioptr, fdc->retry);
  957 
  958         /* Setup ISADMA if we need it and have it */
  959         if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_FMT))
  960              && !(fdc->flags & FDC_NODMA)) {
  961                 mtx_lock(&Giant);
  962                 isa_dmastart(
  963                     bp->bio_cmd & BIO_READ ? ISADMA_READ : ISADMA_WRITE,
  964                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
  965                 mtx_unlock(&Giant);
  966                 mtx_lock(&fdc->fdc_mtx);
  967                 fd->flags |= FD_ISADMA;
  968                 mtx_unlock(&fdc->fdc_mtx);
  969         }
  970 
  971         /* Do PIO if we have to */
  972         if (fdc->flags & FDC_NODMA) {
  973                 if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_FMT))
  974                         fdbcdr_wr(fdc, 1, fd->fd_iosize);
  975                 if (bp->bio_cmd & (BIO_WRITE|BIO_FMT))
  976                         fdc_pio(fdc);
  977         }
  978 
  979         switch(bp->bio_cmd) {
  980         case BIO_FMT:
  981                 /* formatting */
  982                 finfo = (struct fd_formb *)bp->bio_data;
  983                 retry_line = __LINE__;
  984                 if (fdc_cmd(fdc, 6,
  985                     NE7CMD_FORMAT | mfm,
  986                     head << 2 | fd->fdsu,
  987                     finfo->fd_formb_secshift,
  988                     finfo->fd_formb_nsecs,
  989                     finfo->fd_formb_gaplen,
  990                     finfo->fd_formb_fillbyte, 0))
  991                         return (1);
  992                 break;
  993         case BIO_RDID:
  994                 retry_line = __LINE__;
  995                 if (fdc_cmd(fdc, 2,
  996                     NE7CMD_READID | mfm,
  997                     head << 2 | fd->fdsu, 0))
  998                         return (1);
  999                 break;
 1000         case BIO_READ:
 1001                 retry_line = __LINE__;
 1002                 if (fdc_cmd(fdc, 9,
 1003                     NE7CMD_READ | NE7CMD_SK | mfm | NE7CMD_MT,
 1004                     head << 2 | fd->fdsu,       /* head & unit */
 1005                     fd->track,                  /* track */
 1006                     head,                       /* head */
 1007                     sec,                        /* sector + 1 */
 1008                     fd->ft->secsize,            /* sector size */
 1009                     fd->ft->sectrac,            /* sectors/track */
 1010                     fd->ft->gap,                /* gap size */
 1011                     fd->ft->datalen,            /* data length */
 1012                     0))
 1013                         return (1);
 1014                 break;
 1015         case BIO_WRITE:
 1016                 retry_line = __LINE__;
 1017                 if (fdc_cmd(fdc, 9,
 1018                     NE7CMD_WRITE | mfm | NE7CMD_MT,
 1019                     head << 2 | fd->fdsu,       /* head & unit */
 1020                     fd->track,                  /* track */
 1021                     head,                       /* head */
 1022                     sec,                        /* sector + 1 */
 1023                     fd->ft->secsize,            /* sector size */
 1024                     fd->ft->sectrac,            /* sectors/track */
 1025                     fd->ft->gap,                /* gap size */
 1026                     fd->ft->datalen,            /* data length */
 1027                     0))
 1028                         return (1);
 1029                 break;
 1030         default:
 1031                 KASSERT(0 == 1, ("Wrong bio_cmd %x\n", bp->bio_cmd));
 1032         }
 1033 
 1034         /* Wait for interrupt */
 1035         i = tsleep(fdc, PRIBIO, "fddata", hz);
 1036 
 1037         /* PIO if the read looks good */
 1038         if (i == 0 && (fdc->flags & FDC_NODMA) && (bp->bio_cmd & BIO_READ))
 1039                 fdc_pio(fdc);
 1040 
 1041         /* Finish DMA */
 1042         if (fd->flags & FD_ISADMA) {
 1043                 mtx_lock(&Giant);
 1044                 isa_dmadone(
 1045                     bp->bio_cmd & BIO_READ ? ISADMA_READ : ISADMA_WRITE,
 1046                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
 1047                 mtx_unlock(&Giant);
 1048                 mtx_lock(&fdc->fdc_mtx);
 1049                 fd->flags &= ~FD_ISADMA;
 1050                 mtx_unlock(&fdc->fdc_mtx);
 1051         }
 1052 
 1053         if (i != 0) {
 1054                 /*
 1055                  * Timeout.
 1056                  *
 1057                  * Due to IBM's brain-dead design, the FDC has a faked ready
 1058                  * signal, hardwired to ready == true. Thus, any command
 1059                  * issued if there's no diskette in the drive will _never_
 1060                  * complete, and must be aborted by resetting the FDC.
 1061                  * Many thanks, Big Blue!
 1062                  */
 1063                 retry_line = __LINE__;
 1064                 fdc->flags |= FDC_NEEDS_RESET;
 1065                 return (1);
 1066         }
 1067 
 1068         retry_line = __LINE__;
 1069         if (fdc_read_status(fdc))
 1070                 return (1);
 1071 
 1072         if (debugflags & 0x10)
 1073                 printf("  -> %x %x %x %x\n",
 1074                     fdc->status[0], fdc->status[1],
 1075                     fdc->status[2], fdc->status[3]);
 1076 
 1077         st0 = fdc->status[0] & NE7_ST0_IC;
 1078         if (st0 != 0) {
 1079                 retry_line = __LINE__;
 1080                 if (st0 == NE7_ST0_IC_AT && fdc->status[1] & NE7_ST1_OR) {
 1081                         /*
 1082                          * DMA overrun. Someone hogged the bus and
 1083                          * didn't release it in time for the next
 1084                          * FDC transfer.
 1085                          */
 1086                         return (1);
 1087                 }
 1088                 retry_line = __LINE__;
 1089                 if(st0 == NE7_ST0_IC_IV) {
 1090                         fdc->flags |= FDC_NEEDS_RESET;
 1091                         return (1);
 1092                 }
 1093                 retry_line = __LINE__;
 1094                 if(st0 == NE7_ST0_IC_AT && fdc->status[2] & NE7_ST2_WC) {
 1095                         need_recal |= (1 << fd->fdsu);
 1096                         return (1);
 1097                 }
 1098                 if (debugflags & 0x20) {
 1099                         printf("status %02x %02x %02x %02x %02x %02x\n",
 1100                             fdc->status[0], fdc->status[1], fdc->status[2],
 1101                             fdc->status[3], fdc->status[4], fdc->status[5]);
 1102                 }
 1103                 retry_line = __LINE__;
 1104                 return (1);
 1105         }
 1106         /* All OK */
 1107         switch(bp->bio_cmd) {
 1108         case BIO_RDID:
 1109                 /* copy out ID field contents */
 1110                 idp = (struct fdc_readid *)bp->bio_data;
 1111                 idp->cyl = fdc->status[3];
 1112                 idp->head = fdc->status[4];
 1113                 idp->sec = fdc->status[5];
 1114                 idp->secshift = fdc->status[6];
 1115                 if (debugflags & 0x40)
 1116                         printf("c %d h %d s %d z %d\n",
 1117                             idp->cyl, idp->head, idp->sec, idp->secshift);
 1118                 break;
 1119         case BIO_READ:
 1120         case BIO_WRITE:
 1121                 bp->bio_pblkno += nsect;
 1122                 bp->bio_resid -= fd->fd_iosize;
 1123                 bp->bio_completed += fd->fd_iosize;
 1124                 fd->fd_ioptr += fd->fd_iosize;
 1125                 /* Since we managed to get something done, reset the retry */
 1126                 fdc->retry = 0;
 1127                 if (bp->bio_resid > 0)
 1128                         return (0);
 1129                 break;
 1130         case BIO_FMT:
 1131                 break;
 1132         }
 1133         return (fdc_biodone(fdc, 0));
 1134 }
 1135 
 1136 static void
 1137 fdc_thread(void *arg)
 1138 {
 1139         struct fdc_data *fdc;
 1140 
 1141         fdc = arg;
 1142         int i;
 1143 
 1144         mtx_lock(&fdc->fdc_mtx);
 1145         fdc->flags |= FDC_KTHREAD_ALIVE;
 1146         while ((fdc->flags & FDC_KTHREAD_EXIT) == 0) {
 1147                 mtx_unlock(&fdc->fdc_mtx);
 1148                 i = fdc_worker(fdc);
 1149                 if (i && debugflags & 0x20) {
 1150                         if (fdc->bp != NULL) {
 1151                                 g_print_bio(fdc->bp);
 1152                                 printf("\n");
 1153                         }
 1154                         printf("Retry line %d\n", retry_line);
 1155                 }
 1156                 fdc->retry += i;
 1157                 mtx_lock(&fdc->fdc_mtx);
 1158         }
 1159         fdc->flags &= ~(FDC_KTHREAD_EXIT | FDC_KTHREAD_ALIVE);
 1160         mtx_unlock(&fdc->fdc_mtx);
 1161 
 1162         kproc_exit(0);
 1163 }
 1164 
 1165 /*
 1166  * Enqueue a request.
 1167  */
 1168 static void
 1169 fd_enqueue(struct fd_data *fd, struct bio *bp)
 1170 {
 1171         struct fdc_data *fdc;
 1172         int call;
 1173 
 1174         call = 0;
 1175         fdc = fd->fdc;
 1176         mtx_lock(&fdc->fdc_mtx);
 1177         /* If we go from idle, cancel motor turnoff */
 1178         if (fd->fd_iocount++ == 0)
 1179                 callout_stop(&fd->toffhandle);
 1180         if (fd->flags & FD_MOTOR) {
 1181                 /* The motor is on, send it directly to the controller */
 1182                 bioq_disksort(&fdc->head, bp);
 1183                 wakeup(&fdc->head);
 1184         } else {
 1185                 /* Queue it on the drive until the motor has started */
 1186                 bioq_insert_tail(&fd->fd_bq, bp);
 1187                 if (!(fd->flags & FD_MOTORWAIT))
 1188                         fd_motor(fd, 1);
 1189         }
 1190         mtx_unlock(&fdc->fdc_mtx);
 1191 }
 1192 
 1193 /*
 1194  * Try to find out if we have a disk in the drive.
 1195  */
 1196 static int
 1197 fd_probe_disk(struct fd_data *fd, int *recal)
 1198 {
 1199         struct fdc_data *fdc;
 1200         int st0, st3, cyl;
 1201         int oopts, ret;
 1202 
 1203         fdc = fd->fdc;
 1204         oopts = fd->options;
 1205         fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
 1206         ret = 1;
 1207 
 1208         /*
 1209          * First recal, then seek to cyl#1, this clears the old condition on
 1210          * the disk change line so we can examine it for current status.
 1211          */
 1212         if (debugflags & 0x40)
 1213                 printf("New disk in probe\n");
 1214         mtx_lock(&fdc->fdc_mtx);
 1215         fd->flags |= FD_NEWDISK;
 1216         mtx_unlock(&fdc->fdc_mtx);
 1217         if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
 1218                 goto done;
 1219         tsleep(fdc, PRIBIO, "fdrecal", hz);
 1220         if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
 1221                 goto done;      /* XXX */
 1222         if ((st0 & 0xc0) || cyl != 0)
 1223                 goto done;
 1224 
 1225         /* Seek to track 1 */
 1226         if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, 1, 0))
 1227                 goto done;
 1228         tsleep(fdc, PRIBIO, "fdseek", hz);
 1229         if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
 1230                 goto done;      /* XXX */
 1231         *recal |= (1 << fd->fdsu);
 1232         if (fdin_rd(fdc) & FDI_DCHG) {
 1233                 if (debugflags & 0x40)
 1234                         printf("Empty in probe\n");
 1235                 mtx_lock(&fdc->fdc_mtx);
 1236                 fd->flags |= FD_EMPTY;
 1237                 mtx_unlock(&fdc->fdc_mtx);
 1238         } else {
 1239                 if (fdc_sense_drive(fdc, &st3) != 0)
 1240                         goto done;
 1241                 if (debugflags & 0x40)
 1242                         printf("Got disk in probe\n");
 1243                 mtx_lock(&fdc->fdc_mtx);
 1244                 fd->flags &= ~FD_EMPTY;
 1245                 if (st3 & NE7_ST3_WP)
 1246                         fd->flags |= FD_WP;
 1247                 else
 1248                         fd->flags &= ~FD_WP;
 1249                 mtx_unlock(&fdc->fdc_mtx);
 1250         }
 1251         ret = 0;
 1252 
 1253 done:
 1254         fd->options = oopts;
 1255         return (ret);
 1256 }
 1257 
 1258 static int
 1259 fdmisccmd(struct fd_data *fd, u_int cmd, void *data)
 1260 {
 1261         struct bio *bp;
 1262         struct fd_formb *finfo;
 1263         struct fdc_readid *idfield;
 1264         int error;
 1265 
 1266         bp = malloc(sizeof(struct bio), M_TEMP, M_WAITOK | M_ZERO);
 1267 
 1268         /*
 1269          * Set up a bio request for fdstrategy().  bio_offset is faked
 1270          * so that fdstrategy() will seek to the requested
 1271          * cylinder, and use the desired head.
 1272          */
 1273         bp->bio_cmd = cmd;
 1274         if (cmd == BIO_FMT) {
 1275                 finfo = (struct fd_formb *)data;
 1276                 bp->bio_pblkno =
 1277                     (finfo->cyl * fd->ft->heads + finfo->head) *
 1278                     fd->ft->sectrac;
 1279                 bp->bio_length = sizeof *finfo;
 1280         } else if (cmd == BIO_RDID) {
 1281                 idfield = (struct fdc_readid *)data;
 1282                 bp->bio_pblkno =
 1283                     (idfield->cyl * fd->ft->heads + idfield->head) *
 1284                     fd->ft->sectrac;
 1285                 bp->bio_length = sizeof(struct fdc_readid);
 1286         } else if (cmd == BIO_PROBE) {
 1287                 /* nothing */
 1288         } else
 1289                 panic("wrong cmd in fdmisccmd()");
 1290         bp->bio_offset = bp->bio_pblkno * fd->sectorsize;
 1291         bp->bio_data = data;
 1292         bp->bio_driver1 = fd;
 1293         bp->bio_flags = 0;
 1294 
 1295         fd_enqueue(fd, bp);
 1296 
 1297         do {
 1298                 tsleep(bp, PRIBIO, "fdwait", hz);
 1299         } while (!(bp->bio_flags & BIO_DONE));
 1300         error = bp->bio_error;
 1301 
 1302         free(bp, M_TEMP);
 1303         return (error);
 1304 }
 1305 
 1306 /*
 1307  * Try figuring out the density of the media present in our device.
 1308  */
 1309 static int
 1310 fdautoselect(struct fd_data *fd)
 1311 {
 1312         struct fd_type *fdtp;
 1313         struct fdc_readid id;
 1314         int oopts, rv;
 1315 
 1316         if (!(fd->ft->flags & FL_AUTO))
 1317                 return (0);
 1318 
 1319         fdtp = fd_native_types[fd->type];
 1320         fdsettype(fd, fdtp);
 1321         if (!(fd->ft->flags & FL_AUTO))
 1322                 return (0);
 1323 
 1324         /*
 1325          * Try reading sector ID fields, first at cylinder 0, head 0,
 1326          * then at cylinder 2, head N.  We don't probe cylinder 1,
 1327          * since for 5.25in DD media in a HD drive, there are no data
 1328          * to read (2 step pulses per media cylinder required).  For
 1329          * two-sided media, the second probe always goes to head 1, so
 1330          * we can tell them apart from single-sided media.  As a
 1331          * side-effect this means that single-sided media should be
 1332          * mentioned in the search list after two-sided media of an
 1333          * otherwise identical density.  Media with a different number
 1334          * of sectors per track but otherwise identical parameters
 1335          * cannot be distinguished at all.
 1336          *
 1337          * If we successfully read an ID field on both cylinders where
 1338          * the recorded values match our expectation, we are done.
 1339          * Otherwise, we try the next density entry from the table.
 1340          *
 1341          * Stepping to cylinder 2 has the side-effect of clearing the
 1342          * unit attention bit.
 1343          */
 1344         oopts = fd->options;
 1345         fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
 1346         for (; fdtp->heads; fdtp++) {
 1347                 fdsettype(fd, fdtp);
 1348 
 1349                 id.cyl = id.head = 0;
 1350                 rv = fdmisccmd(fd, BIO_RDID, &id);
 1351                 if (rv != 0)
 1352                         continue;
 1353                 if (id.cyl != 0 || id.head != 0 || id.secshift != fdtp->secsize)
 1354                         continue;
 1355                 id.cyl = 2;
 1356                 id.head = fd->ft->heads - 1;
 1357                 rv = fdmisccmd(fd, BIO_RDID, &id);
 1358                 if (id.cyl != 2 || id.head != fdtp->heads - 1 ||
 1359                     id.secshift != fdtp->secsize)
 1360                         continue;
 1361                 if (rv == 0)
 1362                         break;
 1363         }
 1364 
 1365         fd->options = oopts;
 1366         if (fdtp->heads == 0) {
 1367                 if (debugflags & 0x40)
 1368                         device_printf(fd->dev, "autoselection failed\n");
 1369                 fdsettype(fd, fd_native_types[fd->type]);
 1370                 return (-1);
 1371         } else {
 1372                 if (debugflags & 0x40) {
 1373                         device_printf(fd->dev,
 1374                             "autoselected %d KB medium\n", fd->ft->size / 2);
 1375                         fdprinttype(fd->ft);
 1376                 }
 1377                 return (0);
 1378         }
 1379 }
 1380 
 1381 /*
 1382  * GEOM class implementation
 1383  */
 1384 
 1385 static g_access_t       fd_access;
 1386 static g_start_t        fd_start;
 1387 static g_ioctl_t        fd_ioctl;
 1388 
 1389 struct g_class g_fd_class = {
 1390         .name =         "FD",
 1391         .version =      G_VERSION,
 1392         .start =        fd_start,
 1393         .access =       fd_access,
 1394         .ioctl =        fd_ioctl,
 1395 };
 1396 
 1397 static int
 1398 fd_access(struct g_provider *pp, int r, int w, int e)
 1399 {
 1400         struct fd_data *fd;
 1401         struct fdc_data *fdc;
 1402         int ar, aw, ae;
 1403         int busy;
 1404 
 1405         fd = pp->geom->softc;
 1406         fdc = fd->fdc;
 1407 
 1408         /*
 1409          * If our provider is withering, we can only get negative requests
 1410          * and we don't want to even see them
 1411          */
 1412         if (pp->flags & G_PF_WITHER)
 1413                 return (0);
 1414 
 1415         ar = r + pp->acr;
 1416         aw = w + pp->acw;
 1417         ae = e + pp->ace;
 1418 
 1419         if (ar == 0 && aw == 0 && ae == 0) {
 1420                 device_unbusy(fd->dev);
 1421                 return (0);
 1422         }
 1423 
 1424         busy = 0;
 1425         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0) {
 1426                 if (fdmisccmd(fd, BIO_PROBE, NULL))
 1427                         return (ENXIO);
 1428                 if (fd->flags & FD_EMPTY)
 1429                         return (ENXIO);
 1430                 if (fd->flags & FD_NEWDISK) {
 1431                         if (fdautoselect(fd) != 0 &&
 1432                             (device_get_flags(fd->dev) & FD_NO_CHLINE)) {
 1433                                 mtx_lock(&fdc->fdc_mtx);
 1434                                 fd->flags |= FD_EMPTY;
 1435                                 mtx_unlock(&fdc->fdc_mtx);
 1436                                 return (ENXIO);
 1437                         }
 1438                         mtx_lock(&fdc->fdc_mtx);
 1439                         fd->flags &= ~FD_NEWDISK;
 1440                         mtx_unlock(&fdc->fdc_mtx);
 1441                 }
 1442                 device_busy(fd->dev);
 1443                 busy = 1;
 1444         }
 1445 
 1446         if (w > 0 && (fd->flags & FD_WP)) {
 1447                 if (busy)
 1448                         device_unbusy(fd->dev);
 1449                 return (EROFS);
 1450         }
 1451 
 1452         pp->sectorsize = fd->sectorsize;
 1453         pp->stripesize = fd->ft->heads * fd->ft->sectrac * fd->sectorsize;
 1454         pp->mediasize = pp->stripesize * fd->ft->tracks;
 1455         return (0);
 1456 }
 1457 
 1458 static void
 1459 fd_start(struct bio *bp)
 1460 {
 1461         struct fdc_data *       fdc;
 1462         struct fd_data *        fd;
 1463 
 1464         fd = bp->bio_to->geom->softc;
 1465         fdc = fd->fdc;
 1466         bp->bio_driver1 = fd;
 1467         if (bp->bio_cmd & BIO_GETATTR) {
 1468                 if (g_handleattr_int(bp, "GEOM::fwsectors", fd->ft->sectrac))
 1469                         return;
 1470                 if (g_handleattr_int(bp, "GEOM::fwheads", fd->ft->heads))
 1471                         return;
 1472                 g_io_deliver(bp, ENOIOCTL);
 1473                 return;
 1474         }
 1475         if (!(bp->bio_cmd & (BIO_READ|BIO_WRITE))) {
 1476                 g_io_deliver(bp, EOPNOTSUPP);
 1477                 return;
 1478         }
 1479         bp->bio_pblkno = bp->bio_offset / fd->sectorsize;
 1480         bp->bio_resid = bp->bio_length;
 1481         fd_enqueue(fd, bp);
 1482         return;
 1483 }
 1484 
 1485 static int
 1486 fd_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
 1487 {
 1488         struct fd_data *fd;
 1489         struct fdc_status *fsp;
 1490         struct fdc_readid *rid;
 1491         int error;
 1492 
 1493         fd = pp->geom->softc;
 1494 
 1495         switch (cmd) {
 1496         case FD_GTYPE:                  /* get drive type */
 1497                 *(struct fd_type *)data = *fd->ft;
 1498                 return (0);
 1499 
 1500         case FD_STYPE:                  /* set drive type */
 1501                 /*
 1502                  * Allow setting drive type temporarily iff
 1503                  * currently unset.  Used for fdformat so any
 1504                  * user can set it, and then start formatting.
 1505                  */
 1506                 fd->fts = *(struct fd_type *)data;
 1507                 if (fd->fts.sectrac) {
 1508                         /* XXX: check for rubbish */
 1509                         fdsettype(fd, &fd->fts);
 1510                 } else {
 1511                         fdsettype(fd, fd_native_types[fd->type]);
 1512                 }
 1513                 if (debugflags & 0x40)
 1514                         fdprinttype(fd->ft);
 1515                 return (0);
 1516 
 1517         case FD_GOPTS:                  /* get drive options */
 1518                 *(int *)data = fd->options;
 1519                 return (0);
 1520 
 1521         case FD_SOPTS:                  /* set drive options */
 1522                 fd->options = *(int *)data;
 1523                 return (0);
 1524 
 1525         case FD_CLRERR:
 1526                 error = priv_check(td, PRIV_DRIVER);
 1527                 if (error)
 1528                         return (error);
 1529                 fd->fdc->fdc_errs = 0;
 1530                 return (0);
 1531 
 1532         case FD_GSTAT:
 1533                 fsp = (struct fdc_status *)data;
 1534                 if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
 1535                         return (EINVAL);
 1536                 memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
 1537                 return (0);
 1538 
 1539         case FD_GDTYPE:
 1540                 *(enum fd_drivetype *)data = fd->type;
 1541                 return (0);
 1542 
 1543         case FD_FORM:
 1544                 if (!(fflag & FWRITE))
 1545                         return (EPERM);
 1546                 if (((struct fd_formb *)data)->format_version !=
 1547                     FD_FORMAT_VERSION)
 1548                         return (EINVAL); /* wrong version of formatting prog */
 1549                 error = fdmisccmd(fd, BIO_FMT, data);
 1550                 mtx_lock(&fd->fdc->fdc_mtx);
 1551                 fd->flags |= FD_NEWDISK;
 1552                 mtx_unlock(&fd->fdc->fdc_mtx);
 1553                 break;
 1554 
 1555         case FD_READID:
 1556                 rid = (struct fdc_readid *)data;
 1557                 if (rid->cyl > 85 || rid->head > 1)
 1558                         return (EINVAL);
 1559                 error = fdmisccmd(fd, BIO_RDID, data);
 1560                 break;
 1561 
 1562         case FIONBIO:
 1563         case FIOASYNC:
 1564                 /* For backwards compat with old fd*(8) tools */
 1565                 error = 0;
 1566                 break;
 1567 
 1568         default:
 1569                 if (debugflags & 0x80)
 1570                         printf("Unknown ioctl %lx\n", cmd);
 1571                 error = ENOIOCTL;
 1572                 break;
 1573         }
 1574         return (error);
 1575 };
 1576 
 1577 
 1578 
 1579 /*
 1580  * Configuration/initialization stuff, per controller.
 1581  */
 1582 
 1583 devclass_t fdc_devclass;
 1584 static devclass_t fd_devclass;
 1585 
 1586 struct fdc_ivars {
 1587         int     fdunit;
 1588         int     fdtype;
 1589 };
 1590 
 1591 void
 1592 fdc_release_resources(struct fdc_data *fdc)
 1593 {
 1594         device_t dev;
 1595         struct resource *last;
 1596         int i;
 1597 
 1598         dev = fdc->fdc_dev;
 1599         if (fdc->fdc_intr)
 1600                 bus_teardown_intr(dev, fdc->res_irq, fdc->fdc_intr);
 1601         fdc->fdc_intr = NULL;
 1602         if (fdc->res_irq != NULL)
 1603                 bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 1604                     fdc->res_irq);
 1605         fdc->res_irq = NULL;
 1606         last = NULL;
 1607         for (i = 0; i < FDC_MAXREG; i++) {
 1608                 if (fdc->resio[i] != NULL && fdc->resio[i] != last) {
 1609                         bus_release_resource(dev, SYS_RES_IOPORT,
 1610                             fdc->ridio[i], fdc->resio[i]);
 1611                         last = fdc->resio[i];
 1612                         fdc->resio[i] = NULL;
 1613                 }
 1614         }
 1615         if (fdc->res_drq != NULL)
 1616                 bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 1617                     fdc->res_drq);
 1618         fdc->res_drq = NULL;
 1619 }
 1620 
 1621 int
 1622 fdc_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
 1623 {
 1624         struct fdc_ivars *ivars = device_get_ivars(child);
 1625 
 1626         switch (which) {
 1627         case FDC_IVAR_FDUNIT:
 1628                 *result = ivars->fdunit;
 1629                 break;
 1630         case FDC_IVAR_FDTYPE:
 1631                 *result = ivars->fdtype;
 1632                 break;
 1633         default:
 1634                 return (ENOENT);
 1635         }
 1636         return (0);
 1637 }
 1638 
 1639 int
 1640 fdc_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
 1641 {
 1642         struct fdc_ivars *ivars = device_get_ivars(child);
 1643 
 1644         switch (which) {
 1645         case FDC_IVAR_FDUNIT:
 1646                 ivars->fdunit = value;
 1647                 break;
 1648         case FDC_IVAR_FDTYPE:
 1649                 ivars->fdtype = value;
 1650                 break;
 1651         default:
 1652                 return (ENOENT);
 1653         }
 1654         return (0);
 1655 }
 1656 
 1657 int
 1658 fdc_initial_reset(device_t dev, struct fdc_data *fdc)
 1659 {
 1660         int ic_type, part_id;
 1661 
 1662         /*
 1663          * A status value of 0xff is very unlikely, but not theoretically
 1664          * impossible, but it is far more likely to indicate an empty bus.
 1665          */
 1666         if (fdsts_rd(fdc) == 0xff)
 1667                 return (ENXIO);
 1668 
 1669         /*
 1670          * Assert a reset to the floppy controller and check that the status
 1671          * register goes to zero.
 1672          */
 1673         fdout_wr(fdc, 0);
 1674         fdout_wr(fdc, 0);
 1675         if (fdsts_rd(fdc) != 0)
 1676                 return (ENXIO);
 1677 
 1678         /*
 1679          * Clear the reset and see it come ready.
 1680          */
 1681         fdout_wr(fdc, FDO_FRST);
 1682         DELAY(100);
 1683         if (fdsts_rd(fdc) != 0x80)
 1684                 return (ENXIO);
 1685 
 1686         /* Then, see if it can handle a command. */
 1687         if (fdc_cmd(fdc, 3, NE7CMD_SPECIFY, 0xaf, 0x1e, 0))
 1688                 return (ENXIO);
 1689 
 1690         /*
 1691          * Try to identify the chip.
 1692          *
 1693          * The i8272 datasheet documents that unknown commands
 1694          * will return ST0 as 0x80.  The i8272 is supposedly identical
 1695          * to the NEC765.
 1696          * The i82077SL datasheet says 0x90 for the VERSION command,
 1697          * and several "superio" chips emulate this.
 1698          */
 1699         if (fdc_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type))
 1700                 return (ENXIO);
 1701         if (fdc_cmd(fdc, 1, 0x18, 1, &part_id))
 1702                 return (ENXIO);
 1703         if (bootverbose)
 1704                 device_printf(dev,
 1705                     "ic_type %02x part_id %02x\n", ic_type, part_id);
 1706         switch (ic_type & 0xff) {
 1707         case 0x80:
 1708                 device_set_desc(dev, "NEC 765 or clone");
 1709                 fdc->fdct = FDC_NE765;
 1710                 break;
 1711         case 0x81:
 1712         case 0x90:
 1713                 device_set_desc(dev,
 1714                     "Enhanced floppy controller");
 1715                 fdc->fdct = FDC_ENHANCED;
 1716                 break;
 1717         default:
 1718                 device_set_desc(dev, "Generic floppy controller");
 1719                 fdc->fdct = FDC_UNKNOWN;
 1720                 break;
 1721         }
 1722         return (0);
 1723 }
 1724 
 1725 int
 1726 fdc_detach(device_t dev)
 1727 {
 1728         struct  fdc_data *fdc;
 1729         int     error;
 1730 
 1731         fdc = device_get_softc(dev);
 1732 
 1733         /* have our children detached first */
 1734         if ((error = bus_generic_detach(dev)))
 1735                 return (error);
 1736 
 1737         if (fdc->fdc_intr)
 1738                 bus_teardown_intr(dev, fdc->res_irq, fdc->fdc_intr);
 1739         fdc->fdc_intr = NULL;
 1740 
 1741         /* kill worker thread */
 1742         mtx_lock(&fdc->fdc_mtx);
 1743         fdc->flags |= FDC_KTHREAD_EXIT;
 1744         wakeup(&fdc->head);
 1745         while ((fdc->flags & FDC_KTHREAD_ALIVE) != 0)
 1746                 msleep(fdc->fdc_thread, &fdc->fdc_mtx, PRIBIO, "fdcdet", 0);
 1747         mtx_unlock(&fdc->fdc_mtx);
 1748 
 1749         /* reset controller, turn motor off */
 1750         fdout_wr(fdc, 0);
 1751 
 1752         if (!(fdc->flags & FDC_NODMA))
 1753                 isa_dma_release(fdc->dmachan);
 1754         fdc_release_resources(fdc);
 1755         mtx_destroy(&fdc->fdc_mtx);
 1756         return (0);
 1757 }
 1758 
 1759 /*
 1760  * Add a child device to the fdc controller.  It will then be probed etc.
 1761  */
 1762 device_t
 1763 fdc_add_child(device_t dev, const char *name, int unit)
 1764 {
 1765         struct fdc_ivars *ivar;
 1766         device_t child;
 1767 
 1768         ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_NOWAIT | M_ZERO);
 1769         if (ivar == NULL)
 1770                 return (NULL);
 1771         child = device_add_child(dev, name, unit);
 1772         if (child == NULL) {
 1773                 free(ivar, M_DEVBUF);
 1774                 return (NULL);
 1775         }
 1776         device_set_ivars(child, ivar);
 1777         ivar->fdunit = unit;
 1778         ivar->fdtype = FDT_NONE;
 1779         if (resource_disabled(name, unit))
 1780                 device_disable(child);
 1781         return (child);
 1782 }
 1783 
 1784 int
 1785 fdc_attach(device_t dev)
 1786 {
 1787         struct  fdc_data *fdc;
 1788         int     error;
 1789 
 1790         fdc = device_get_softc(dev);
 1791         fdc->fdc_dev = dev;
 1792         error = fdc_initial_reset(dev, fdc);
 1793         if (error) {
 1794                 device_printf(dev, "does not respond\n");
 1795                 return (error);
 1796         }
 1797         error = bus_setup_intr(dev, fdc->res_irq,
 1798             INTR_TYPE_BIO | INTR_ENTROPY | 
 1799             ((fdc->flags & FDC_NOFAST) ? INTR_MPSAFE : 0),                     
 1800             ((fdc->flags & FDC_NOFAST) ? NULL : fdc_intr_fast),             
 1801             ((fdc->flags & FDC_NOFAST) ? fdc_intr : NULL), 
 1802                                fdc, &fdc->fdc_intr);
 1803         if (error) {
 1804                 device_printf(dev, "cannot setup interrupt\n");
 1805                 return (error);
 1806         }
 1807         if (!(fdc->flags & FDC_NODMA)) {
 1808                 error = isa_dma_acquire(fdc->dmachan);
 1809                 if (!error) {
 1810                         error = isa_dma_init(fdc->dmachan,
 1811                             MAX_BYTES_PER_CYL, M_WAITOK);
 1812                         if (error)
 1813                                 isa_dma_release(fdc->dmachan);
 1814                 }
 1815                 if (error)
 1816                         return (error);
 1817         }
 1818         fdc->fdcu = device_get_unit(dev);
 1819         fdc->flags |= FDC_NEEDS_RESET;
 1820 
 1821         mtx_init(&fdc->fdc_mtx, "fdc lock", NULL, MTX_DEF);
 1822 
 1823         /* reset controller, turn motor off, clear fdout mirror reg */
 1824         fdout_wr(fdc, fdc->fdout = 0);
 1825         bioq_init(&fdc->head);
 1826 
 1827         kproc_create(fdc_thread, fdc, &fdc->fdc_thread, 0, 0,
 1828             "fdc%d", device_get_unit(dev));
 1829 
 1830         settle = hz / 8;
 1831 
 1832         return (0);
 1833 }
 1834 
 1835 int
 1836 fdc_hints_probe(device_t dev)
 1837 {
 1838         const char *name, *dname;
 1839         int i, error, dunit;
 1840 
 1841         /*
 1842          * Probe and attach any children.  We should probably detect
 1843          * devices from the BIOS unless overridden.
 1844          */
 1845         name = device_get_nameunit(dev);
 1846         i = 0;
 1847         while ((resource_find_match(&i, &dname, &dunit, "at", name)) == 0) {
 1848                 resource_int_value(dname, dunit, "drive", &dunit);
 1849                 fdc_add_child(dev, dname, dunit);
 1850         }
 1851 
 1852         if ((error = bus_generic_attach(dev)) != 0)
 1853                 return (error);
 1854         return (0);
 1855 }
 1856 
 1857 int
 1858 fdc_print_child(device_t me, device_t child)
 1859 {
 1860         int retval = 0, flags;
 1861 
 1862         retval += bus_print_child_header(me, child);
 1863         retval += printf(" on %s drive %d", device_get_nameunit(me),
 1864                fdc_get_fdunit(child));
 1865         if ((flags = device_get_flags(me)) != 0)
 1866                 retval += printf(" flags %#x", flags);
 1867         retval += printf("\n");
 1868 
 1869         return (retval);
 1870 }
 1871 
 1872 /*
 1873  * Configuration/initialization, per drive.
 1874  */
 1875 static int
 1876 fd_probe(device_t dev)
 1877 {
 1878         int     i, unit;
 1879         u_int   st0, st3;
 1880         struct  fd_data *fd;
 1881         struct  fdc_data *fdc;
 1882         int     fdsu;
 1883         int     flags, type;
 1884 
 1885         fdsu = fdc_get_fdunit(dev);
 1886         fd = device_get_softc(dev);
 1887         fdc = device_get_softc(device_get_parent(dev));
 1888         flags = device_get_flags(dev);
 1889 
 1890         fd->dev = dev;
 1891         fd->fdc = fdc;
 1892         fd->fdsu = fdsu;
 1893         unit = device_get_unit(dev);
 1894 
 1895         /* Auto-probe if fdinfo is present, but always allow override. */
 1896         type = flags & FD_TYPEMASK;
 1897         if (type == FDT_NONE && (type = fdc_get_fdtype(dev)) != FDT_NONE) {
 1898                 fd->type = type;
 1899                 goto done;
 1900         } else {
 1901                 /* make sure fdautoselect() will be called */
 1902                 fd->flags = FD_EMPTY;
 1903                 fd->type = type;
 1904         }
 1905 
 1906 #if (defined(__i386__) && !defined(PC98)) || defined(__amd64__)
 1907         if (fd->type == FDT_NONE && (unit == 0 || unit == 1)) {
 1908                 /* Look up what the BIOS thinks we have. */
 1909                 if (unit == 0)
 1910                         fd->type = (rtcin(RTC_FDISKETTE) & 0xf0) >> 4;
 1911                 else
 1912                         fd->type = rtcin(RTC_FDISKETTE) & 0x0f;
 1913                 if (fd->type == FDT_288M_1)
 1914                         fd->type = FDT_288M;
 1915         }
 1916 #endif /* __i386__ || __amd64__ */
 1917         /* is there a unit? */
 1918         if (fd->type == FDT_NONE)
 1919                 return (ENXIO);
 1920 
 1921 /*
 1922         mtx_lock(&fdc->fdc_mtx);
 1923 */
 1924         /* select it */
 1925         fd_select(fd);
 1926         fd_motor(fd, 1);
 1927         fdc->fd = fd;
 1928         fdc_reset(fdc);         /* XXX reset, then unreset, etc. */
 1929         DELAY(1000000); /* 1 sec */
 1930 
 1931         if ((flags & FD_NO_PROBE) == 0) {
 1932                 /* If we're at track 0 first seek inwards. */
 1933                 if ((fdc_sense_drive(fdc, &st3) == 0) &&
 1934                     (st3 & NE7_ST3_T0)) {
 1935                         /* Seek some steps... */
 1936                         if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
 1937                                 /* ...wait a moment... */
 1938                                 DELAY(300000);
 1939                                 /* make ctrlr happy: */
 1940                                 fdc_sense_int(fdc, NULL, NULL);
 1941                         }
 1942                 }
 1943 
 1944                 for (i = 0; i < 2; i++) {
 1945                         /*
 1946                          * we must recalibrate twice, just in case the
 1947                          * heads have been beyond cylinder 76, since
 1948                          * most FDCs still barf when attempting to
 1949                          * recalibrate more than 77 steps
 1950                          */
 1951                         /* go back to 0: */
 1952                         if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
 1953                                 /* a second being enough for full stroke seek*/
 1954                                 DELAY(i == 0 ? 1000000 : 300000);
 1955 
 1956                                 /* anything responding? */
 1957                                 if (fdc_sense_int(fdc, &st0, NULL) == 0 &&
 1958                                     (st0 & NE7_ST0_EC) == 0)
 1959                                         break; /* already probed succesfully */
 1960                         }
 1961                 }
 1962         }
 1963 
 1964         fd_motor(fd, 0);
 1965         fdc->fd = NULL;
 1966 /*
 1967         mtx_unlock(&fdc->fdc_mtx);
 1968 */
 1969 
 1970         if ((flags & FD_NO_PROBE) == 0 &&
 1971             (st0 & NE7_ST0_EC) != 0) /* no track 0 -> no drive present */
 1972                 return (ENXIO);
 1973 
 1974 done:
 1975 
 1976         switch (fd->type) {
 1977         case FDT_12M:
 1978                 device_set_desc(dev, "1200-KB 5.25\" drive");
 1979                 break;
 1980         case FDT_144M:
 1981                 device_set_desc(dev, "1440-KB 3.5\" drive");
 1982                 break;
 1983         case FDT_288M:
 1984                 device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
 1985                 break;
 1986         case FDT_360K:
 1987                 device_set_desc(dev, "360-KB 5.25\" drive");
 1988                 break;
 1989         case FDT_720K:
 1990                 device_set_desc(dev, "720-KB 3.5\" drive");
 1991                 break;
 1992         default:
 1993                 return (ENXIO);
 1994         }
 1995         fd->track = FD_NO_TRACK;
 1996         fd->fdc = fdc;
 1997         fd->fdsu = fdsu;
 1998         fd->options = 0;
 1999         callout_init_mtx(&fd->toffhandle, &fd->fdc->fdc_mtx, 0);
 2000 
 2001         /* initialize densities for subdevices */
 2002         fdsettype(fd, fd_native_types[fd->type]);
 2003         return (0);
 2004 }
 2005 
 2006 /*
 2007  * We have to do this in a geom event because GEOM is not running
 2008  * when fd_attach() is.
 2009  * XXX: move fd_attach after geom like ata/scsi disks
 2010  */
 2011 static void
 2012 fd_attach2(void *arg, int flag)
 2013 {
 2014         struct  fd_data *fd;
 2015 
 2016         fd = arg;
 2017 
 2018         fd->fd_geom = g_new_geomf(&g_fd_class,
 2019             "fd%d", device_get_unit(fd->dev));
 2020         fd->fd_provider = g_new_providerf(fd->fd_geom, fd->fd_geom->name);
 2021         fd->fd_geom->softc = fd;
 2022         g_error_provider(fd->fd_provider, 0);
 2023 }
 2024 
 2025 static int
 2026 fd_attach(device_t dev)
 2027 {
 2028         struct  fd_data *fd;
 2029 
 2030         fd = device_get_softc(dev);
 2031         g_post_event(fd_attach2, fd, M_WAITOK, NULL);
 2032         fd->flags |= FD_EMPTY;
 2033         bioq_init(&fd->fd_bq);
 2034 
 2035         return (0);
 2036 }
 2037 
 2038 static void
 2039 fd_detach_geom(void *arg, int flag)
 2040 {
 2041         struct  fd_data *fd = arg;
 2042 
 2043         g_topology_assert();
 2044         g_wither_geom(fd->fd_geom, ENXIO);
 2045 }
 2046 
 2047 static int
 2048 fd_detach(device_t dev)
 2049 {
 2050         struct  fd_data *fd;
 2051 
 2052         fd = device_get_softc(dev);
 2053         g_waitfor_event(fd_detach_geom, fd, M_WAITOK, NULL);
 2054         while (device_get_state(dev) == DS_BUSY)
 2055                 tsleep(fd, PZERO, "fdd", hz/10);
 2056         callout_drain(&fd->toffhandle);
 2057 
 2058         return (0);
 2059 }
 2060 
 2061 static device_method_t fd_methods[] = {
 2062         /* Device interface */
 2063         DEVMETHOD(device_probe,         fd_probe),
 2064         DEVMETHOD(device_attach,        fd_attach),
 2065         DEVMETHOD(device_detach,        fd_detach),
 2066         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
 2067         DEVMETHOD(device_suspend,       bus_generic_suspend), /* XXX */
 2068         DEVMETHOD(device_resume,        bus_generic_resume), /* XXX */
 2069         { 0, 0 }
 2070 };
 2071 
 2072 static driver_t fd_driver = {
 2073         "fd",
 2074         fd_methods,
 2075         sizeof(struct fd_data)
 2076 };
 2077 
 2078 static int
 2079 fdc_modevent(module_t mod, int type, void *data)
 2080 {
 2081 
 2082         return (g_modevent(NULL, type, &g_fd_class));
 2083 }
 2084 
 2085 DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, fdc_modevent, 0);

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