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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2004 Poul-Henning Kamp
    5  * Copyright (c) 1990 The Regents of the University of California.
    6  * All rights reserved.
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * Don Ahn.
   10  *
   11  * Libretto PCMCIA floppy support by David Horwitt (dhorwitt@ucsd.edu)
   12  * aided by the Linux floppy driver modifications from David Bateman
   13  * (dbateman@eng.uts.edu.au).
   14  *
   15  * Copyright (c) 1993, 1994 by
   16  *  jc@irbs.UUCP (John Capo)
   17  *  vak@zebub.msk.su (Serge Vakulenko)
   18  *  ache@astral.msk.su (Andrew A. Chernov)
   19  *
   20  * Copyright (c) 1993, 1994, 1995 by
   21  *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
   22  *  dufault@hda.com (Peter Dufault)
   23  *
   24  * Copyright (c) 2001 Joerg Wunsch,
   25  *  joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
   26  *
   27  * Redistribution and use in source and binary forms, with or without
   28  * modification, are permitted provided that the following conditions
   29  * are met:
   30  * 1. Redistributions of source code must retain the above copyright
   31  *    notice, this list of conditions and the following disclaimer.
   32  * 2. Redistributions in binary form must reproduce the above copyright
   33  *    notice, this list of conditions and the following disclaimer in the
   34  *    documentation and/or other materials provided with the distribution.
   35  * 3. Neither the name of the University nor the names of its contributors
   36  *    may be used to endorse or promote products derived from this software
   37  *    without specific prior written permission.
   38  *
   39  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   40  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   42  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   43  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   44  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   45  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   47  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   48  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   49  * SUCH DAMAGE.
   50  *
   51  *      from:   @(#)fd.c        7.4 (Berkeley) 5/25/91
   52  *
   53  */
   54 
   55 #include <sys/cdefs.h>
   56 __FBSDID("$FreeBSD: head/sys/dev/fdc/fdc.c 326022 2017-11-20 19:36:21Z pfg $");
   57 
   58 #include "opt_fdc.h"
   59 
   60 #include <sys/param.h>
   61 #include <sys/bio.h>
   62 #include <sys/bus.h>
   63 #include <sys/devicestat.h>
   64 #include <sys/disk.h>
   65 #include <sys/fcntl.h>
   66 #include <sys/fdcio.h>
   67 #include <sys/filio.h>
   68 #include <sys/kernel.h>
   69 #include <sys/kthread.h>
   70 #include <sys/lock.h>
   71 #include <sys/malloc.h>
   72 #include <sys/module.h>
   73 #include <sys/mutex.h>
   74 #include <sys/priv.h>
   75 #include <sys/proc.h>
   76 #include <sys/rman.h>
   77 #include <sys/sysctl.h>
   78 #include <sys/systm.h>
   79 
   80 #include <geom/geom.h>
   81 
   82 #include <machine/bus.h>
   83 #include <machine/clock.h>
   84 #include <machine/stdarg.h>
   85 
   86 #include <isa/isavar.h>
   87 #include <isa/isareg.h>
   88 #include <isa/rtc.h>
   89 #include <dev/fdc/fdcvar.h>
   90 
   91 #include <dev/ic/nec765.h>
   92 
   93 /*
   94  * Runtime configuration hints/flags
   95  */
   96 
   97 /* configuration flags for fd */
   98 #define FD_TYPEMASK     0x0f    /* drive type, matches enum
   99                                  * fd_drivetype; on i386 machines, if
  100                                  * given as 0, use RTC type for fd0
  101                                  * and fd1 */
  102 #define FD_NO_CHLINE    0x10    /* drive does not support changeline
  103                                  * aka. unit attention */
  104 #define FD_NO_PROBE     0x20    /* don't probe drive (seek test), just
  105                                  * assume it is there */
  106 
  107 /*
  108  * Things that could conceiveably considered parameters or tweakables
  109  */
  110 
  111 /*
  112  * Maximal number of bytes in a cylinder.
  113  * This is used for ISADMA bouncebuffer allocation and sets the max
  114  * xfersize we support.
  115  *
  116  * 2.88M format has 2 x 36 x 512, allow for hacked up density.
  117  */
  118 #define MAX_BYTES_PER_CYL       (2 * 40 * 512)
  119 
  120 /*
  121  * Timeout value for the PIO loops to wait until the FDC main status
  122  * register matches our expectations (request for master, direction
  123  * bit).  This is supposed to be a number of microseconds, although
  124  * timing might actually not be very accurate.
  125  *
  126  * Timeouts of 100 msec are believed to be required for some broken
  127  * (old) hardware.
  128  */
  129 #define FDSTS_TIMEOUT   100000
  130 
  131 /*
  132  * After this many errors, stop whining.  Close will reset this count.
  133  */
  134 #define FDC_ERRMAX      100
  135 
  136 /*
  137  * AutoDensity search lists for each drive type.
  138  */
  139 
  140 static struct fd_type fd_searchlist_360k[] = {
  141         { FDF_5_360 },
  142         { 0 }
  143 };
  144 
  145 static struct fd_type fd_searchlist_12m[] = {
  146         { FDF_5_1200 | FL_AUTO },
  147         { FDF_5_400 | FL_AUTO },
  148         { FDF_5_360 | FL_2STEP | FL_AUTO},
  149         { 0 }
  150 };
  151 
  152 static struct fd_type fd_searchlist_720k[] = {
  153         { FDF_3_720 },
  154         { 0 }
  155 };
  156 
  157 static struct fd_type fd_searchlist_144m[] = {
  158         { FDF_3_1440 | FL_AUTO},
  159         { FDF_3_720 | FL_AUTO},
  160         { 0 }
  161 };
  162 
  163 static struct fd_type fd_searchlist_288m[] = {
  164         { FDF_3_1440 | FL_AUTO },
  165 #if 0
  166         { FDF_3_2880 | FL_AUTO }, /* XXX: probably doesn't work */
  167 #endif
  168         { FDF_3_720 | FL_AUTO},
  169         { 0 }
  170 };
  171 
  172 /*
  173  * Order must match enum fd_drivetype in <sys/fdcio.h>.
  174  */
  175 static struct fd_type *fd_native_types[] = {
  176         NULL,                           /* FDT_NONE */
  177         fd_searchlist_360k,             /* FDT_360K */
  178         fd_searchlist_12m,              /* FDT_12M */
  179         fd_searchlist_720k,             /* FDT_720K */
  180         fd_searchlist_144m,             /* FDT_144M */
  181         fd_searchlist_288m,             /* FDT_288M_1 (mapped to FDT_288M) */
  182         fd_searchlist_288m,             /* FDT_288M */
  183 };
  184 
  185 /*
  186  * Internals start here
  187  */
  188 
  189 /* registers */
  190 #define FDOUT   2       /* Digital Output Register (W) */
  191 #define FDO_FDSEL       0x03    /*  floppy device select */
  192 #define FDO_FRST        0x04    /*  floppy controller reset */
  193 #define FDO_FDMAEN      0x08    /*  enable floppy DMA and Interrupt */
  194 #define FDO_MOEN0       0x10    /*  motor enable drive 0 */
  195 #define FDO_MOEN1       0x20    /*  motor enable drive 1 */
  196 #define FDO_MOEN2       0x40    /*  motor enable drive 2 */
  197 #define FDO_MOEN3       0x80    /*  motor enable drive 3 */
  198 
  199 #define FDSTS   4       /* NEC 765 Main Status Register (R) */
  200 #define FDDSR   4       /* Data Rate Select Register (W) */
  201 #define FDDATA  5       /* NEC 765 Data Register (R/W) */
  202 #define FDCTL   7       /* Control Register (W) */
  203 
  204 /*
  205  * The YE-DATA PC Card floppies use PIO to read in the data rather
  206  * than DMA due to the wild variability of DMA for the PC Card
  207  * devices.  DMA was deleted from the PC Card specification in version
  208  * 7.2 of the standard, but that post-dates the YE-DATA devices by many
  209  * years.
  210  *
  211  * In addition, if we cannot setup the DMA resources for the ISA
  212  * attachment, we'll use this same offset for data transfer.  However,
  213  * that almost certainly won't work.
  214  *
  215  * For this mode, offset 0 and 1 must be used to setup the transfer
  216  * for this floppy.  This is OK for PC Card YE Data devices, but for
  217  * ISA this is likely wrong.  These registers are only available on
  218  * those systems that map them to the floppy drive.  Newer systems do
  219  * not do this, and we should likely prohibit access to them (or
  220  * disallow NODMA to be set).
  221  */
  222 #define FDBCDR          0       /* And 1 */
  223 #define FD_YE_DATAPORT  6       /* Drive Data port */
  224 
  225 #define FDI_DCHG        0x80    /* diskette has been changed */
  226                                 /* requires drive and motor being selected */
  227                                 /* is cleared by any step pulse to drive */
  228 
  229 /*
  230  * We have three private BIO commands.
  231  */
  232 #define BIO_PROBE       BIO_CMD0
  233 #define BIO_RDID        BIO_CMD1
  234 #define BIO_FMT         BIO_CMD2
  235 
  236 /*
  237  * Per drive structure (softc).
  238  */
  239 struct fd_data {
  240         u_char  *fd_ioptr;      /* IO pointer */
  241         u_int   fd_iosize;      /* Size of IO chunks */
  242         u_int   fd_iocount;     /* Outstanding requests */
  243         struct  fdc_data *fdc;  /* pointer to controller structure */
  244         int     fdsu;           /* this units number on this controller */
  245         enum    fd_drivetype type; /* drive type */
  246         struct  fd_type *ft;    /* pointer to current type descriptor */
  247         struct  fd_type fts;    /* type descriptors */
  248         int     sectorsize;
  249         int     flags;
  250 #define FD_WP           (1<<0)  /* Write protected      */
  251 #define FD_MOTOR        (1<<1)  /* motor should be on   */
  252 #define FD_MOTORWAIT    (1<<2)  /* motor should be on   */
  253 #define FD_EMPTY        (1<<3)  /* no media             */
  254 #define FD_NEWDISK      (1<<4)  /* media changed        */
  255 #define FD_ISADMA       (1<<5)  /* isa dma started      */
  256         int     track;          /* where we think the head is */
  257 #define FD_NO_TRACK      -2
  258         int     options;        /* FDOPT_* */
  259         struct  callout toffhandle;
  260         struct g_geom *fd_geom;
  261         struct g_provider *fd_provider;
  262         device_t dev;
  263         struct bio_queue_head fd_bq;
  264 };
  265 
  266 #define FD_NOT_VALID -2
  267 
  268 static driver_intr_t fdc_intr;
  269 static driver_filter_t fdc_intr_fast;
  270 static void fdc_reset(struct fdc_data *);
  271 static int fd_probe_disk(struct fd_data *, int *);
  272 
  273 static SYSCTL_NODE(_debug, OID_AUTO, fdc, CTLFLAG_RW, 0, "fdc driver");
  274 
  275 static int fifo_threshold = 8;
  276 SYSCTL_INT(_debug_fdc, OID_AUTO, fifo, CTLFLAG_RW, &fifo_threshold, 0,
  277         "FIFO threshold setting");
  278 
  279 static int debugflags = 0;
  280 SYSCTL_INT(_debug_fdc, OID_AUTO, debugflags, CTLFLAG_RW, &debugflags, 0,
  281         "Debug flags");
  282 
  283 static int retries = 10;
  284 SYSCTL_INT(_debug_fdc, OID_AUTO, retries, CTLFLAG_RW, &retries, 0,
  285         "Number of retries to attempt");
  286 
  287 static int spec1 = NE7_SPEC_1(6, 240);
  288 SYSCTL_INT(_debug_fdc, OID_AUTO, spec1, CTLFLAG_RW, &spec1, 0,
  289         "Specification byte one (step-rate + head unload)");
  290 
  291 static int spec2 = NE7_SPEC_2(16, 0);
  292 SYSCTL_INT(_debug_fdc, OID_AUTO, spec2, CTLFLAG_RW, &spec2, 0,
  293         "Specification byte two (head load time + no-dma)");
  294 
  295 static int settle;
  296 SYSCTL_INT(_debug_fdc, OID_AUTO, settle, CTLFLAG_RW, &settle, 0,
  297         "Head settling time in sec/hz");
  298 
  299 static void
  300 fdprinttype(struct fd_type *ft)
  301 {
  302 
  303         printf("(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,0x%x)",
  304             ft->sectrac, ft->secsize, ft->datalen, ft->gap, ft->tracks,
  305             ft->size, ft->trans, ft->heads, ft->f_gap, ft->f_inter,
  306             ft->offset_side2, ft->flags);
  307 }
  308 
  309 static void
  310 fdsettype(struct fd_data *fd, struct fd_type *ft)
  311 {
  312         fd->ft = ft;
  313         ft->size = ft->sectrac * ft->heads * ft->tracks;
  314         fd->sectorsize = 128 << fd->ft->secsize;
  315 }
  316 
  317 /*
  318  * Bus space handling (access to low-level IO).
  319  */
  320 static inline void
  321 fdregwr(struct fdc_data *fdc, int reg, uint8_t v)
  322 {
  323 
  324         bus_space_write_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg], v);
  325 }
  326 
  327 static inline uint8_t
  328 fdregrd(struct fdc_data *fdc, int reg)
  329 {
  330 
  331         return bus_space_read_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg]);
  332 }
  333 
  334 static void
  335 fdctl_wr(struct fdc_data *fdc, u_int8_t v)
  336 {
  337 
  338         fdregwr(fdc, FDCTL, v);
  339 }
  340 
  341 static void
  342 fdout_wr(struct fdc_data *fdc, u_int8_t v)
  343 {
  344 
  345         fdregwr(fdc, FDOUT, v);
  346 }
  347 
  348 static u_int8_t
  349 fdsts_rd(struct fdc_data *fdc)
  350 {
  351 
  352         return fdregrd(fdc, FDSTS);
  353 }
  354 
  355 static void
  356 fddsr_wr(struct fdc_data *fdc, u_int8_t v)
  357 {
  358 
  359         fdregwr(fdc, FDDSR, v);
  360 }
  361 
  362 static void
  363 fddata_wr(struct fdc_data *fdc, u_int8_t v)
  364 {
  365 
  366         fdregwr(fdc, FDDATA, v);
  367 }
  368 
  369 static u_int8_t
  370 fddata_rd(struct fdc_data *fdc)
  371 {
  372 
  373         return fdregrd(fdc, FDDATA);
  374 }
  375 
  376 static u_int8_t
  377 fdin_rd(struct fdc_data *fdc)
  378 {
  379 
  380         return fdregrd(fdc, FDCTL);
  381 }
  382 
  383 /*
  384  * Magic pseudo-DMA initialization for YE FDC. Sets count and
  385  * direction.
  386  */
  387 static void
  388 fdbcdr_wr(struct fdc_data *fdc, int iswrite, uint16_t count)
  389 {
  390         fdregwr(fdc, FDBCDR, (count - 1) & 0xff);
  391         fdregwr(fdc, FDBCDR + 1,
  392             (iswrite ? 0x80 : 0) | (((count - 1) >> 8) & 0x7f));
  393 }
  394 
  395 static int
  396 fdc_err(struct fdc_data *fdc, const char *s)
  397 {
  398         fdc->fdc_errs++;
  399         if (s) {
  400                 if (fdc->fdc_errs < FDC_ERRMAX)
  401                         device_printf(fdc->fdc_dev, "%s", s);
  402                 else if (fdc->fdc_errs == FDC_ERRMAX)
  403                         device_printf(fdc->fdc_dev, "too many errors, not "
  404                                                     "logging any more\n");
  405         }
  406 
  407         return (1);
  408 }
  409 
  410 /*
  411  * FDC IO functions, take care of the main status register, timeout
  412  * in case the desired status bits are never set.
  413  *
  414  * These PIO loops initially start out with short delays between
  415  * each iteration in the expectation that the required condition
  416  * is usually met quickly, so it can be handled immediately.
  417  */
  418 static int
  419 fdc_in(struct fdc_data *fdc, int *ptr)
  420 {
  421         int i, j, step;
  422 
  423         step = 1;
  424         for (j = 0; j < FDSTS_TIMEOUT; j += step) {
  425                 i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
  426                 if (i == (NE7_DIO|NE7_RQM)) {
  427                         i = fddata_rd(fdc);
  428                         if (ptr)
  429                                 *ptr = i;
  430                         return (0);
  431                 }
  432                 if (i == NE7_RQM)
  433                         return (fdc_err(fdc, "ready for output in input\n"));
  434                 step += step;
  435                 DELAY(step);
  436         }
  437         return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
  438 }
  439 
  440 static int
  441 fdc_out(struct fdc_data *fdc, int x)
  442 {
  443         int i, j, step;
  444 
  445         step = 1;
  446         for (j = 0; j < FDSTS_TIMEOUT; j += step) {
  447                 i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
  448                 if (i == NE7_RQM) {
  449                         fddata_wr(fdc, x);
  450                         return (0);
  451                 }
  452                 if (i == (NE7_DIO|NE7_RQM))
  453                         return (fdc_err(fdc, "ready for input in output\n"));
  454                 step += step;
  455                 DELAY(step);
  456         }
  457         return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
  458 }
  459 
  460 /*
  461  * fdc_cmd: Send a command to the chip.
  462  * Takes a varargs with this structure:
  463  *      # of output bytes
  464  *      output bytes as int [...]
  465  *      # of input bytes
  466  *      input bytes as int* [...]
  467  */
  468 static int
  469 fdc_cmd(struct fdc_data *fdc, int n_out, ...)
  470 {
  471         u_char cmd = 0;
  472         int n_in;
  473         int n, i;
  474         va_list ap;
  475 
  476         va_start(ap, n_out);
  477         for (n = 0; n < n_out; n++) {
  478                 i = va_arg(ap, int);
  479                 if (n == 0)
  480                         cmd = i;
  481                 if (fdc_out(fdc, i) < 0) {
  482                         char msg[50];
  483                         snprintf(msg, sizeof(msg),
  484                                 "cmd %x failed at out byte %d of %d\n",
  485                                 cmd, n + 1, n_out);
  486                         fdc->flags |= FDC_NEEDS_RESET;
  487                         va_end(ap);
  488                         return fdc_err(fdc, msg);
  489                 }
  490         }
  491         n_in = va_arg(ap, int);
  492         for (n = 0; n < n_in; n++) {
  493                 int *ptr = va_arg(ap, int *);
  494                 if (fdc_in(fdc, ptr) < 0) {
  495                         char msg[50];
  496                         snprintf(msg, sizeof(msg),
  497                                 "cmd %02x failed at in byte %d of %d\n",
  498                                 cmd, n + 1, n_in);
  499                         fdc->flags |= FDC_NEEDS_RESET;
  500                         va_end(ap);
  501                         return fdc_err(fdc, msg);
  502                 }
  503         }
  504         va_end(ap);
  505         return (0);
  506 }
  507 
  508 static void
  509 fdc_reset(struct fdc_data *fdc)
  510 {
  511         int i, r[10];
  512 
  513         if (fdc->fdct == FDC_ENHANCED) {
  514                 /* Try a software reset, default precomp, and 500 kb/s */
  515                 fddsr_wr(fdc, I8207X_DSR_SR);
  516         } else {
  517                 /* Try a hardware reset, keep motor on */
  518                 fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
  519                 DELAY(100);
  520                 /* enable FDC, but defer interrupts a moment */
  521                 fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
  522         }
  523         DELAY(100);
  524         fdout_wr(fdc, fdc->fdout);
  525 
  526         /* XXX after a reset, silently believe the FDC will accept commands */
  527         if (fdc_cmd(fdc, 3, NE7CMD_SPECIFY, spec1, spec2, 0))
  528                 device_printf(fdc->fdc_dev, " SPECIFY failed in reset\n");
  529 
  530         if (fdc->fdct == FDC_ENHANCED) {
  531                 if (fdc_cmd(fdc, 4,
  532                     I8207X_CONFIG,
  533                     0,
  534                     /* 0x40 | */                /* Enable Implied Seek -
  535                                                  * breaks 2step! */
  536                     0x10 |                      /* Polling disabled */
  537                     (fifo_threshold - 1),       /* Fifo threshold */
  538                     0x00,                       /* Precomp track */
  539                     0))
  540                         device_printf(fdc->fdc_dev,
  541                             " CONFIGURE failed in reset\n");
  542                 if (debugflags & 1) {
  543                         if (fdc_cmd(fdc, 1,
  544                             I8207X_DUMPREG,
  545                             10, &r[0], &r[1], &r[2], &r[3], &r[4],
  546                             &r[5], &r[6], &r[7], &r[8], &r[9]))
  547                                 device_printf(fdc->fdc_dev,
  548                                     " DUMPREG failed in reset\n");
  549                         for (i = 0; i < 10; i++)
  550                                 printf(" %02x", r[i]);
  551                         printf("\n");
  552                 }
  553         }
  554 }
  555 
  556 static int
  557 fdc_sense_drive(struct fdc_data *fdc, int *st3p)
  558 {
  559         int st3;
  560 
  561         if (fdc_cmd(fdc, 2, NE7CMD_SENSED, fdc->fd->fdsu, 1, &st3))
  562                 return (fdc_err(fdc, "Sense Drive Status failed\n"));
  563         if (st3p)
  564                 *st3p = st3;
  565         return (0);
  566 }
  567 
  568 static int
  569 fdc_sense_int(struct fdc_data *fdc, int *st0p, int *cylp)
  570 {
  571         int cyl, st0, ret;
  572 
  573         ret = fdc_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
  574         if (ret) {
  575                 (void)fdc_err(fdc, "sense intr err reading stat reg 0\n");
  576                 return (ret);
  577         }
  578 
  579         if (st0p)
  580                 *st0p = st0;
  581 
  582         if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
  583                 /*
  584                  * There doesn't seem to have been an interrupt.
  585                  */
  586                 return (FD_NOT_VALID);
  587         }
  588 
  589         if (fdc_in(fdc, &cyl) < 0)
  590                 return fdc_err(fdc, "can't get cyl num\n");
  591 
  592         if (cylp)
  593                 *cylp = cyl;
  594 
  595         return (0);
  596 }
  597 
  598 static int
  599 fdc_read_status(struct fdc_data *fdc)
  600 {
  601         int i, ret, status;
  602 
  603         for (i = ret = 0; i < 7; i++) {
  604                 ret = fdc_in(fdc, &status);
  605                 fdc->status[i] = status;
  606                 if (ret != 0)
  607                         break;
  608         }
  609 
  610         if (ret == 0)
  611                 fdc->flags |= FDC_STAT_VALID;
  612         else
  613                 fdc->flags &= ~FDC_STAT_VALID;
  614 
  615         return ret;
  616 }
  617 
  618 /*
  619  * Select this drive
  620  */
  621 static void
  622 fd_select(struct fd_data *fd)
  623 {
  624         struct fdc_data *fdc;
  625 
  626         /* XXX: lock controller */
  627         fdc = fd->fdc;
  628         fdc->fdout &= ~FDO_FDSEL;
  629         fdc->fdout |= FDO_FDMAEN | FDO_FRST | fd->fdsu;
  630         fdout_wr(fdc, fdc->fdout);
  631 }
  632 
  633 static void
  634 fd_turnon(void *arg)
  635 {
  636         struct fd_data *fd;
  637         struct bio *bp;
  638         int once;
  639 
  640         fd = arg;
  641         mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
  642         fd->flags &= ~FD_MOTORWAIT;
  643         fd->flags |= FD_MOTOR;
  644         once = 0;
  645         for (;;) {
  646                 bp = bioq_takefirst(&fd->fd_bq);
  647                 if (bp == NULL)
  648                         break;
  649                 bioq_disksort(&fd->fdc->head, bp);
  650                 once = 1;
  651         }
  652         if (once)
  653                 wakeup(&fd->fdc->head);
  654 }
  655 
  656 static void
  657 fd_motor(struct fd_data *fd, int turnon)
  658 {
  659         struct fdc_data *fdc;
  660 
  661         fdc = fd->fdc;
  662 /*
  663         mtx_assert(&fdc->fdc_mtx, MA_OWNED);
  664 */
  665         if (turnon) {
  666                 fd->flags |= FD_MOTORWAIT;
  667                 fdc->fdout |= (FDO_MOEN0 << fd->fdsu);
  668                 callout_reset(&fd->toffhandle, hz, fd_turnon, fd);
  669         } else {
  670                 callout_stop(&fd->toffhandle);
  671                 fd->flags &= ~(FD_MOTOR|FD_MOTORWAIT);
  672                 fdc->fdout &= ~(FDO_MOEN0 << fd->fdsu);
  673         }
  674         fdout_wr(fdc, fdc->fdout);
  675 }
  676 
  677 static void
  678 fd_turnoff(void *xfd)
  679 {
  680         struct fd_data *fd = xfd;
  681 
  682         mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
  683         fd_motor(fd, 0);
  684 }
  685 
  686 /*
  687  * fdc_intr - wake up the worker thread.
  688  */
  689 
  690 static void
  691 fdc_intr(void *arg)
  692 {
  693 
  694         wakeup(arg);
  695 }
  696 
  697 static int
  698 fdc_intr_fast(void *arg)
  699 {
  700 
  701         wakeup(arg);
  702         return(FILTER_HANDLED);
  703 }
  704 
  705 /*
  706  * fdc_pio(): perform programmed IO read/write for YE PCMCIA floppy.
  707  */
  708 static void
  709 fdc_pio(struct fdc_data *fdc)
  710 {
  711         u_char *cptr;
  712         struct bio *bp;
  713         u_int count;
  714 
  715         bp = fdc->bp;
  716         cptr = fdc->fd->fd_ioptr;
  717         count = fdc->fd->fd_iosize;
  718 
  719         if (bp->bio_cmd == BIO_READ) {
  720                 fdbcdr_wr(fdc, 0, count);
  721                 bus_space_read_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
  722                     fdc->ioff[FD_YE_DATAPORT], cptr, count);
  723         } else {
  724                 bus_space_write_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
  725                     fdc->ioff[FD_YE_DATAPORT], cptr, count);
  726                 fdbcdr_wr(fdc, 0, count);       /* needed? */
  727         }
  728 }
  729 
  730 static int
  731 fdc_biodone(struct fdc_data *fdc, int error)
  732 {
  733         struct fd_data *fd;
  734         struct bio *bp;
  735 
  736         fd = fdc->fd;
  737         bp = fdc->bp;
  738 
  739         mtx_lock(&fdc->fdc_mtx);
  740         if (--fd->fd_iocount == 0)
  741                 callout_reset(&fd->toffhandle, 4 * hz, fd_turnoff, fd);
  742         fdc->bp = NULL;
  743         fdc->fd = NULL;
  744         mtx_unlock(&fdc->fdc_mtx);
  745         if (bp->bio_to != NULL) {
  746                 if ((debugflags & 2) && fd->fdc->retry > 0)
  747                         printf("retries: %d\n", fd->fdc->retry);
  748                 g_io_deliver(bp, error);
  749                 return (0);
  750         }
  751         bp->bio_error = error;
  752         bp->bio_flags |= BIO_DONE;
  753         wakeup(bp);
  754         return (0);
  755 }
  756 
  757 static int retry_line;
  758 
  759 static int
  760 fdc_worker(struct fdc_data *fdc)
  761 {
  762         struct fd_data *fd;
  763         struct bio *bp;
  764         int i, nsect;
  765         int st0, st3, cyl, mfm, steptrac, cylinder, descyl, sec;
  766         int head;
  767         int override_error;
  768         static int need_recal;
  769         struct fdc_readid *idp;
  770         struct fd_formb *finfo;
  771 
  772         override_error = 0;
  773 
  774         /* Have we exhausted our retries ? */
  775         bp = fdc->bp;
  776         fd = fdc->fd;
  777         if (bp != NULL &&
  778                 (fdc->retry >= retries || (fd->options & FDOPT_NORETRY))) {
  779                 if ((debugflags & 4))
  780                         printf("Too many retries (EIO)\n");
  781                 if (fdc->flags & FDC_NEEDS_RESET) {
  782                         mtx_lock(&fdc->fdc_mtx);
  783                         fd->flags |= FD_EMPTY;
  784                         mtx_unlock(&fdc->fdc_mtx);
  785                 }
  786                 return (fdc_biodone(fdc, EIO));
  787         }
  788 
  789         /* Disable ISADMA if we bailed while it was active */
  790         if (fd != NULL && (fd->flags & FD_ISADMA)) {
  791                 isa_dmadone(
  792                     bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
  793                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
  794                 mtx_lock(&fdc->fdc_mtx);
  795                 fd->flags &= ~FD_ISADMA;
  796                 mtx_unlock(&fdc->fdc_mtx);
  797         }
  798 
  799         /* Unwedge the controller ? */
  800         if (fdc->flags & FDC_NEEDS_RESET) {
  801                 fdc->flags &= ~FDC_NEEDS_RESET;
  802                 fdc_reset(fdc);
  803                 if (cold)
  804                         DELAY(1000000);
  805                 else
  806                         tsleep(fdc, PRIBIO, "fdcrst", hz);
  807                 /* Discard results */
  808                 for (i = 0; i < 4; i++)
  809                         fdc_sense_int(fdc, &st0, &cyl);
  810                 /* All drives must recal */
  811                 need_recal = 0xf;
  812         }
  813 
  814         /* Pick up a request, if need be wait for it */
  815         if (fdc->bp == NULL) {
  816                 mtx_lock(&fdc->fdc_mtx);
  817                 do {
  818                         fdc->bp = bioq_takefirst(&fdc->head);
  819                         if (fdc->bp == NULL)
  820                                 msleep(&fdc->head, &fdc->fdc_mtx,
  821                                     PRIBIO, "-", 0);
  822                 } while (fdc->bp == NULL &&
  823                     (fdc->flags & FDC_KTHREAD_EXIT) == 0);
  824                 mtx_unlock(&fdc->fdc_mtx);
  825 
  826                 if (fdc->bp == NULL)
  827                         /*
  828                          * Nothing to do, worker thread has been
  829                          * requested to stop.
  830                          */
  831                         return (0);
  832 
  833                 bp = fdc->bp;
  834                 fd = fdc->fd = bp->bio_driver1;
  835                 fdc->retry = 0;
  836                 fd->fd_ioptr = bp->bio_data;
  837                 if (bp->bio_cmd == BIO_FMT) {
  838                         i = offsetof(struct fd_formb, fd_formb_cylno(0));
  839                         fd->fd_ioptr += i;
  840                         fd->fd_iosize = bp->bio_length - i;
  841                 }
  842         }
  843 
  844         /* Select drive, setup params */
  845         fd_select(fd);
  846         if (fdc->fdct == FDC_ENHANCED)
  847                 fddsr_wr(fdc, fd->ft->trans);
  848         else
  849                 fdctl_wr(fdc, fd->ft->trans);
  850 
  851         if (bp->bio_cmd == BIO_PROBE) {
  852                 if ((!(device_get_flags(fd->dev) & FD_NO_CHLINE) &&
  853                     !(fdin_rd(fdc) & FDI_DCHG) &&
  854                     !(fd->flags & FD_EMPTY)) ||
  855                     fd_probe_disk(fd, &need_recal) == 0)
  856                         return (fdc_biodone(fdc, 0));
  857                 return (1);
  858         }
  859 
  860         /*
  861          * If we are dead just flush the requests
  862          */
  863         if (fd->flags & FD_EMPTY)
  864                 return (fdc_biodone(fdc, ENXIO));
  865 
  866         /* Check if we lost our media */
  867         if (fdin_rd(fdc) & FDI_DCHG) {
  868                 if (debugflags & 0x40)
  869                         printf("Lost disk\n");
  870                 mtx_lock(&fdc->fdc_mtx);
  871                 fd->flags |= FD_EMPTY;
  872                 fd->flags |= FD_NEWDISK;
  873                 mtx_unlock(&fdc->fdc_mtx);
  874                 g_topology_lock();
  875                 g_orphan_provider(fd->fd_provider, ENXIO);
  876                 fd->fd_provider->flags |= G_PF_WITHER;
  877                 fd->fd_provider =
  878                     g_new_providerf(fd->fd_geom, "%s", fd->fd_geom->name);
  879                 g_error_provider(fd->fd_provider, 0);
  880                 g_topology_unlock();
  881                 return (fdc_biodone(fdc, ENXIO));
  882         }
  883 
  884         /* Check if the floppy is write-protected */
  885         if (bp->bio_cmd == BIO_FMT || bp->bio_cmd == BIO_WRITE) {
  886                 retry_line = __LINE__;
  887                 if(fdc_sense_drive(fdc, &st3) != 0)
  888                         return (1);
  889                 if(st3 & NE7_ST3_WP)
  890                         return (fdc_biodone(fdc, EROFS));
  891         }
  892 
  893         mfm = (fd->ft->flags & FL_MFM)? NE7CMD_MFM: 0;
  894         steptrac = (fd->ft->flags & FL_2STEP)? 2: 1;
  895         i = fd->ft->sectrac * fd->ft->heads;
  896         cylinder = bp->bio_pblkno / i;
  897         descyl = cylinder * steptrac;
  898         sec = bp->bio_pblkno % i;
  899         nsect = i - sec;
  900         head = sec / fd->ft->sectrac;
  901         sec = sec % fd->ft->sectrac + 1;
  902 
  903         /* If everything is going swimmingly, use multisector xfer */
  904         if (fdc->retry == 0 &&
  905             (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE)) {
  906                 fd->fd_iosize = imin(nsect * fd->sectorsize, bp->bio_resid);
  907                 nsect = fd->fd_iosize / fd->sectorsize;
  908         } else if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) {
  909                 fd->fd_iosize = fd->sectorsize;
  910                 nsect = 1;
  911         }
  912 
  913         /* Do RECAL if we need to or are going to track zero anyway */
  914         if ((need_recal & (1 << fd->fdsu)) ||
  915             (cylinder == 0 && fd->track != 0) ||
  916             fdc->retry > 2) {
  917                 retry_line = __LINE__;
  918                 if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
  919                         return (1);
  920                 tsleep(fdc, PRIBIO, "fdrecal", hz);
  921                 retry_line = __LINE__;
  922                 if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
  923                         return (1); /* XXX */
  924                 retry_line = __LINE__;
  925                 if ((st0 & 0xc0) || cyl != 0)
  926                         return (1);
  927                 need_recal &= ~(1 << fd->fdsu);
  928                 fd->track = 0;
  929                 /* let the heads settle */
  930                 if (settle)
  931                         tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
  932         }
  933 
  934         /*
  935          * SEEK to where we want to be
  936          */
  937         if (cylinder != fd->track) {
  938                 retry_line = __LINE__;
  939                 if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, descyl, 0))
  940                         return (1);
  941                 tsleep(fdc, PRIBIO, "fdseek", hz);
  942                 retry_line = __LINE__;
  943                 if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
  944                         return (1); /* XXX */
  945                 retry_line = __LINE__;
  946                 if ((st0 & 0xc0) || cyl != descyl) {
  947                         need_recal |= (1 << fd->fdsu);
  948                         return (1);
  949                 }
  950                 /* let the heads settle */
  951                 if (settle)
  952                         tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
  953         }
  954         fd->track = cylinder;
  955 
  956         if (debugflags & 8)
  957                 printf("op %x bn %ju siz %u ptr %p retry %d\n",
  958                     bp->bio_cmd, bp->bio_pblkno, fd->fd_iosize,
  959                     fd->fd_ioptr, fdc->retry);
  960 
  961         /* Setup ISADMA if we need it and have it */
  962         if ((bp->bio_cmd == BIO_READ ||
  963                 bp->bio_cmd == BIO_WRITE ||
  964                 bp->bio_cmd == BIO_FMT)
  965              && !(fdc->flags & FDC_NODMA)) {
  966                 isa_dmastart(
  967                     bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
  968                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
  969                 mtx_lock(&fdc->fdc_mtx);
  970                 fd->flags |= FD_ISADMA;
  971                 mtx_unlock(&fdc->fdc_mtx);
  972         }
  973 
  974         /* Do PIO if we have to */
  975         if (fdc->flags & FDC_NODMA) {
  976                 if (bp->bio_cmd == BIO_READ ||
  977                     bp->bio_cmd == BIO_WRITE ||
  978                     bp->bio_cmd == BIO_FMT)
  979                         fdbcdr_wr(fdc, 1, fd->fd_iosize);
  980                 if (bp->bio_cmd == BIO_WRITE ||
  981                     bp->bio_cmd == BIO_FMT)
  982                         fdc_pio(fdc);
  983         }
  984 
  985         switch(bp->bio_cmd) {
  986         case BIO_FMT:
  987                 /* formatting */
  988                 finfo = (struct fd_formb *)bp->bio_data;
  989                 retry_line = __LINE__;
  990                 if (fdc_cmd(fdc, 6,
  991                     NE7CMD_FORMAT | mfm,
  992                     head << 2 | fd->fdsu,
  993                     finfo->fd_formb_secshift,
  994                     finfo->fd_formb_nsecs,
  995                     finfo->fd_formb_gaplen,
  996                     finfo->fd_formb_fillbyte, 0))
  997                         return (1);
  998                 break;
  999         case BIO_RDID:
 1000                 retry_line = __LINE__;
 1001                 if (fdc_cmd(fdc, 2,
 1002                     NE7CMD_READID | mfm,
 1003                     head << 2 | fd->fdsu, 0))
 1004                         return (1);
 1005                 break;
 1006         case BIO_READ:
 1007                 retry_line = __LINE__;
 1008                 if (fdc_cmd(fdc, 9,
 1009                     NE7CMD_READ | NE7CMD_SK | mfm | NE7CMD_MT,
 1010                     head << 2 | fd->fdsu,       /* head & unit */
 1011                     fd->track,                  /* track */
 1012                     head,                       /* head */
 1013                     sec,                        /* sector + 1 */
 1014                     fd->ft->secsize,            /* sector size */
 1015                     fd->ft->sectrac,            /* sectors/track */
 1016                     fd->ft->gap,                /* gap size */
 1017                     fd->ft->datalen,            /* data length */
 1018                     0))
 1019                         return (1);
 1020                 break;
 1021         case BIO_WRITE:
 1022                 retry_line = __LINE__;
 1023                 if (fdc_cmd(fdc, 9,
 1024                     NE7CMD_WRITE | mfm | NE7CMD_MT,
 1025                     head << 2 | fd->fdsu,       /* head & unit */
 1026                     fd->track,                  /* track */
 1027                     head,                       /* head */
 1028                     sec,                        /* sector + 1 */
 1029                     fd->ft->secsize,            /* sector size */
 1030                     fd->ft->sectrac,            /* sectors/track */
 1031                     fd->ft->gap,                /* gap size */
 1032                     fd->ft->datalen,            /* data length */
 1033                     0))
 1034                         return (1);
 1035                 break;
 1036         default:
 1037                 KASSERT(0 == 1, ("Wrong bio_cmd %x\n", bp->bio_cmd));
 1038         }
 1039 
 1040         /* Wait for interrupt */
 1041         i = tsleep(fdc, PRIBIO, "fddata", hz);
 1042 
 1043         /* PIO if the read looks good */
 1044         if (i == 0 && (fdc->flags & FDC_NODMA) && (bp->bio_cmd == BIO_READ))
 1045                 fdc_pio(fdc);
 1046 
 1047         /* Finish DMA */
 1048         if (fd->flags & FD_ISADMA) {
 1049                 isa_dmadone(
 1050                     bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
 1051                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
 1052                 mtx_lock(&fdc->fdc_mtx);
 1053                 fd->flags &= ~FD_ISADMA;
 1054                 mtx_unlock(&fdc->fdc_mtx);
 1055         }
 1056 
 1057         if (i != 0) {
 1058                 /*
 1059                  * Timeout.
 1060                  *
 1061                  * Due to IBM's brain-dead design, the FDC has a faked ready
 1062                  * signal, hardwired to ready == true. Thus, any command
 1063                  * issued if there's no diskette in the drive will _never_
 1064                  * complete, and must be aborted by resetting the FDC.
 1065                  * Many thanks, Big Blue!
 1066                  */
 1067                 retry_line = __LINE__;
 1068                 fdc->flags |= FDC_NEEDS_RESET;
 1069                 return (1);
 1070         }
 1071 
 1072         retry_line = __LINE__;
 1073         if (fdc_read_status(fdc))
 1074                 return (1);
 1075 
 1076         if (debugflags & 0x10)
 1077                 printf("  -> %x %x %x %x\n",
 1078                     fdc->status[0], fdc->status[1],
 1079                     fdc->status[2], fdc->status[3]);
 1080 
 1081         st0 = fdc->status[0] & NE7_ST0_IC;
 1082         if (st0 != 0) {
 1083                 retry_line = __LINE__;
 1084                 if (st0 == NE7_ST0_IC_AT && fdc->status[1] & NE7_ST1_OR) {
 1085                         /*
 1086                          * DMA overrun. Someone hogged the bus and
 1087                          * didn't release it in time for the next
 1088                          * FDC transfer.
 1089                          */
 1090                         return (1);
 1091                 }
 1092                 retry_line = __LINE__;
 1093                 if(st0 == NE7_ST0_IC_IV) {
 1094                         fdc->flags |= FDC_NEEDS_RESET;
 1095                         return (1);
 1096                 }
 1097                 retry_line = __LINE__;
 1098                 if(st0 == NE7_ST0_IC_AT && fdc->status[2] & NE7_ST2_WC) {
 1099                         need_recal |= (1 << fd->fdsu);
 1100                         return (1);
 1101                 }
 1102                 if (debugflags & 0x20) {
 1103                         printf("status %02x %02x %02x %02x %02x %02x\n",
 1104                             fdc->status[0], fdc->status[1], fdc->status[2],
 1105                             fdc->status[3], fdc->status[4], fdc->status[5]);
 1106                 }
 1107                 retry_line = __LINE__;
 1108                 if (fd->options & FDOPT_NOERROR)
 1109                         override_error = 1;
 1110                 else
 1111                         return (1);
 1112         }
 1113         /* All OK */
 1114         switch(bp->bio_cmd) {
 1115         case BIO_RDID:
 1116                 /* copy out ID field contents */
 1117                 idp = (struct fdc_readid *)bp->bio_data;
 1118                 idp->cyl = fdc->status[3];
 1119                 idp->head = fdc->status[4];
 1120                 idp->sec = fdc->status[5];
 1121                 idp->secshift = fdc->status[6];
 1122                 if (debugflags & 0x40)
 1123                         printf("c %d h %d s %d z %d\n",
 1124                             idp->cyl, idp->head, idp->sec, idp->secshift);
 1125                 break;
 1126         case BIO_READ:
 1127         case BIO_WRITE:
 1128                 bp->bio_pblkno += nsect;
 1129                 bp->bio_resid -= fd->fd_iosize;
 1130                 bp->bio_completed += fd->fd_iosize;
 1131                 fd->fd_ioptr += fd->fd_iosize;
 1132                 if (override_error) {
 1133                         if ((debugflags & 4))
 1134                                 printf("FDOPT_NOERROR: returning bad data\n");
 1135                 } else {
 1136                         /* Since we managed to get something done,
 1137                          * reset the retry */
 1138                         fdc->retry = 0;
 1139                         if (bp->bio_resid > 0)
 1140                                 return (0);
 1141                 }
 1142                 break;
 1143         case BIO_FMT:
 1144                 break;
 1145         }
 1146         return (fdc_biodone(fdc, 0));
 1147 }
 1148 
 1149 static void
 1150 fdc_thread(void *arg)
 1151 {
 1152         struct fdc_data *fdc;
 1153 
 1154         fdc = arg;
 1155         int i;
 1156 
 1157         mtx_lock(&fdc->fdc_mtx);
 1158         fdc->flags |= FDC_KTHREAD_ALIVE;
 1159         while ((fdc->flags & FDC_KTHREAD_EXIT) == 0) {
 1160                 mtx_unlock(&fdc->fdc_mtx);
 1161                 i = fdc_worker(fdc);
 1162                 if (i && debugflags & 0x20) {
 1163                         if (fdc->bp != NULL) {
 1164                                 g_print_bio(fdc->bp);
 1165                                 printf("\n");
 1166                         }
 1167                         printf("Retry line %d\n", retry_line);
 1168                 }
 1169                 fdc->retry += i;
 1170                 mtx_lock(&fdc->fdc_mtx);
 1171         }
 1172         fdc->flags &= ~(FDC_KTHREAD_EXIT | FDC_KTHREAD_ALIVE);
 1173         mtx_unlock(&fdc->fdc_mtx);
 1174 
 1175         kproc_exit(0);
 1176 }
 1177 
 1178 /*
 1179  * Enqueue a request.
 1180  */
 1181 static void
 1182 fd_enqueue(struct fd_data *fd, struct bio *bp)
 1183 {
 1184         struct fdc_data *fdc;
 1185         int call;
 1186 
 1187         call = 0;
 1188         fdc = fd->fdc;
 1189         mtx_lock(&fdc->fdc_mtx);
 1190         /* If we go from idle, cancel motor turnoff */
 1191         if (fd->fd_iocount++ == 0)
 1192                 callout_stop(&fd->toffhandle);
 1193         if (fd->flags & FD_MOTOR) {
 1194                 /* The motor is on, send it directly to the controller */
 1195                 bioq_disksort(&fdc->head, bp);
 1196                 wakeup(&fdc->head);
 1197         } else {
 1198                 /* Queue it on the drive until the motor has started */
 1199                 bioq_insert_tail(&fd->fd_bq, bp);
 1200                 if (!(fd->flags & FD_MOTORWAIT))
 1201                         fd_motor(fd, 1);
 1202         }
 1203         mtx_unlock(&fdc->fdc_mtx);
 1204 }
 1205 
 1206 /*
 1207  * Try to find out if we have a disk in the drive.
 1208  */
 1209 static int
 1210 fd_probe_disk(struct fd_data *fd, int *recal)
 1211 {
 1212         struct fdc_data *fdc;
 1213         int st0, st3, cyl;
 1214         int oopts, ret;
 1215 
 1216         fdc = fd->fdc;
 1217         oopts = fd->options;
 1218         fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
 1219         ret = 1;
 1220 
 1221         /*
 1222          * First recal, then seek to cyl#1, this clears the old condition on
 1223          * the disk change line so we can examine it for current status.
 1224          */
 1225         if (debugflags & 0x40)
 1226                 printf("New disk in probe\n");
 1227         mtx_lock(&fdc->fdc_mtx);
 1228         fd->flags |= FD_NEWDISK;
 1229         mtx_unlock(&fdc->fdc_mtx);
 1230         if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
 1231                 goto done;
 1232         tsleep(fdc, PRIBIO, "fdrecal", hz);
 1233         if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
 1234                 goto done;      /* XXX */
 1235         if ((st0 & 0xc0) || cyl != 0)
 1236                 goto done;
 1237 
 1238         /* Seek to track 1 */
 1239         if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, 1, 0))
 1240                 goto done;
 1241         tsleep(fdc, PRIBIO, "fdseek", hz);
 1242         if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
 1243                 goto done;      /* XXX */
 1244         *recal |= (1 << fd->fdsu);
 1245         if (fdin_rd(fdc) & FDI_DCHG) {
 1246                 if (debugflags & 0x40)
 1247                         printf("Empty in probe\n");
 1248                 mtx_lock(&fdc->fdc_mtx);
 1249                 fd->flags |= FD_EMPTY;
 1250                 mtx_unlock(&fdc->fdc_mtx);
 1251         } else {
 1252                 if (fdc_sense_drive(fdc, &st3) != 0)
 1253                         goto done;
 1254                 if (debugflags & 0x40)
 1255                         printf("Got disk in probe\n");
 1256                 mtx_lock(&fdc->fdc_mtx);
 1257                 fd->flags &= ~FD_EMPTY;
 1258                 if (st3 & NE7_ST3_WP)
 1259                         fd->flags |= FD_WP;
 1260                 else
 1261                         fd->flags &= ~FD_WP;
 1262                 mtx_unlock(&fdc->fdc_mtx);
 1263         }
 1264         ret = 0;
 1265 
 1266 done:
 1267         fd->options = oopts;
 1268         return (ret);
 1269 }
 1270 
 1271 static int
 1272 fdmisccmd(struct fd_data *fd, u_int cmd, void *data)
 1273 {
 1274         struct bio *bp;
 1275         struct fd_formb *finfo;
 1276         struct fdc_readid *idfield;
 1277         int error;
 1278 
 1279         bp = malloc(sizeof(struct bio), M_TEMP, M_WAITOK | M_ZERO);
 1280 
 1281         /*
 1282          * Set up a bio request for fdstrategy().  bio_offset is faked
 1283          * so that fdstrategy() will seek to the requested
 1284          * cylinder, and use the desired head.
 1285          */
 1286         bp->bio_cmd = cmd;
 1287         if (cmd == BIO_FMT) {
 1288                 finfo = (struct fd_formb *)data;
 1289                 bp->bio_pblkno =
 1290                     (finfo->cyl * fd->ft->heads + finfo->head) *
 1291                     fd->ft->sectrac;
 1292                 bp->bio_length = sizeof *finfo;
 1293         } else if (cmd == BIO_RDID) {
 1294                 idfield = (struct fdc_readid *)data;
 1295                 bp->bio_pblkno =
 1296                     (idfield->cyl * fd->ft->heads + idfield->head) *
 1297                     fd->ft->sectrac;
 1298                 bp->bio_length = sizeof(struct fdc_readid);
 1299         } else if (cmd == BIO_PROBE) {
 1300                 /* nothing */
 1301         } else
 1302                 panic("wrong cmd in fdmisccmd()");
 1303         bp->bio_offset = bp->bio_pblkno * fd->sectorsize;
 1304         bp->bio_data = data;
 1305         bp->bio_driver1 = fd;
 1306         bp->bio_flags = 0;
 1307 
 1308         fd_enqueue(fd, bp);
 1309 
 1310         do {
 1311                 tsleep(bp, PRIBIO, "fdwait", hz);
 1312         } while (!(bp->bio_flags & BIO_DONE));
 1313         error = bp->bio_error;
 1314 
 1315         free(bp, M_TEMP);
 1316         return (error);
 1317 }
 1318 
 1319 /*
 1320  * Try figuring out the density of the media present in our device.
 1321  */
 1322 static int
 1323 fdautoselect(struct fd_data *fd)
 1324 {
 1325         struct fd_type *fdtp;
 1326         struct fdc_readid id;
 1327         int oopts, rv;
 1328 
 1329         if (!(fd->ft->flags & FL_AUTO))
 1330                 return (0);
 1331 
 1332         fdtp = fd_native_types[fd->type];
 1333         fdsettype(fd, fdtp);
 1334         if (!(fd->ft->flags & FL_AUTO))
 1335                 return (0);
 1336 
 1337         /*
 1338          * Try reading sector ID fields, first at cylinder 0, head 0,
 1339          * then at cylinder 2, head N.  We don't probe cylinder 1,
 1340          * since for 5.25in DD media in a HD drive, there are no data
 1341          * to read (2 step pulses per media cylinder required).  For
 1342          * two-sided media, the second probe always goes to head 1, so
 1343          * we can tell them apart from single-sided media.  As a
 1344          * side-effect this means that single-sided media should be
 1345          * mentioned in the search list after two-sided media of an
 1346          * otherwise identical density.  Media with a different number
 1347          * of sectors per track but otherwise identical parameters
 1348          * cannot be distinguished at all.
 1349          *
 1350          * If we successfully read an ID field on both cylinders where
 1351          * the recorded values match our expectation, we are done.
 1352          * Otherwise, we try the next density entry from the table.
 1353          *
 1354          * Stepping to cylinder 2 has the side-effect of clearing the
 1355          * unit attention bit.
 1356          */
 1357         oopts = fd->options;
 1358         fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
 1359         for (; fdtp->heads; fdtp++) {
 1360                 fdsettype(fd, fdtp);
 1361 
 1362                 id.cyl = id.head = 0;
 1363                 rv = fdmisccmd(fd, BIO_RDID, &id);
 1364                 if (rv != 0)
 1365                         continue;
 1366                 if (id.cyl != 0 || id.head != 0 || id.secshift != fdtp->secsize)
 1367                         continue;
 1368                 id.cyl = 2;
 1369                 id.head = fd->ft->heads - 1;
 1370                 rv = fdmisccmd(fd, BIO_RDID, &id);
 1371                 if (id.cyl != 2 || id.head != fdtp->heads - 1 ||
 1372                     id.secshift != fdtp->secsize)
 1373                         continue;
 1374                 if (rv == 0)
 1375                         break;
 1376         }
 1377 
 1378         fd->options = oopts;
 1379         if (fdtp->heads == 0) {
 1380                 if (debugflags & 0x40)
 1381                         device_printf(fd->dev, "autoselection failed\n");
 1382                 fdsettype(fd, fd_native_types[fd->type]);
 1383                 return (-1);
 1384         } else {
 1385                 if (debugflags & 0x40) {
 1386                         device_printf(fd->dev,
 1387                             "autoselected %d KB medium\n",
 1388                             fd->ft->size / 2);
 1389                         fdprinttype(fd->ft);
 1390                 }
 1391                 return (0);
 1392         }
 1393 }
 1394 
 1395 /*
 1396  * GEOM class implementation
 1397  */
 1398 
 1399 static g_access_t       fd_access;
 1400 static g_start_t        fd_start;
 1401 static g_ioctl_t        fd_ioctl;
 1402 
 1403 struct g_class g_fd_class = {
 1404         .name =         "FD",
 1405         .version =      G_VERSION,
 1406         .start =        fd_start,
 1407         .access =       fd_access,
 1408         .ioctl =        fd_ioctl,
 1409 };
 1410 
 1411 static int
 1412 fd_access(struct g_provider *pp, int r, int w, int e)
 1413 {
 1414         struct fd_data *fd;
 1415         struct fdc_data *fdc;
 1416         int ar, aw, ae;
 1417         int busy;
 1418 
 1419         fd = pp->geom->softc;
 1420         fdc = fd->fdc;
 1421 
 1422         /*
 1423          * If our provider is withering, we can only get negative requests
 1424          * and we don't want to even see them
 1425          */
 1426         if (pp->flags & G_PF_WITHER)
 1427                 return (0);
 1428 
 1429         ar = r + pp->acr;
 1430         aw = w + pp->acw;
 1431         ae = e + pp->ace;
 1432 
 1433         if (ar == 0 && aw == 0 && ae == 0) {
 1434                 fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG | FDOPT_NOERROR);
 1435                 device_unbusy(fd->dev);
 1436                 return (0);
 1437         }
 1438 
 1439         busy = 0;
 1440         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0) {
 1441                 if (fdmisccmd(fd, BIO_PROBE, NULL))
 1442                         return (ENXIO);
 1443                 if (fd->flags & FD_EMPTY)
 1444                         return (ENXIO);
 1445                 if (fd->flags & FD_NEWDISK) {
 1446                         if (fdautoselect(fd) != 0 &&
 1447                             (device_get_flags(fd->dev) & FD_NO_CHLINE)) {
 1448                                 mtx_lock(&fdc->fdc_mtx);
 1449                                 fd->flags |= FD_EMPTY;
 1450                                 mtx_unlock(&fdc->fdc_mtx);
 1451                                 return (ENXIO);
 1452                         }
 1453                         mtx_lock(&fdc->fdc_mtx);
 1454                         fd->flags &= ~FD_NEWDISK;
 1455                         mtx_unlock(&fdc->fdc_mtx);
 1456                 }
 1457                 device_busy(fd->dev);
 1458                 busy = 1;
 1459         }
 1460 
 1461         if (w > 0 && (fd->flags & FD_WP)) {
 1462                 if (busy)
 1463                         device_unbusy(fd->dev);
 1464                 return (EROFS);
 1465         }
 1466 
 1467         pp->sectorsize = fd->sectorsize;
 1468         pp->stripesize = fd->ft->heads * fd->ft->sectrac * fd->sectorsize;
 1469         pp->mediasize = pp->stripesize * fd->ft->tracks;
 1470         return (0);
 1471 }
 1472 
 1473 static void
 1474 fd_start(struct bio *bp)
 1475 {
 1476         struct fdc_data *       fdc;
 1477         struct fd_data *        fd;
 1478 
 1479         fd = bp->bio_to->geom->softc;
 1480         fdc = fd->fdc;
 1481         bp->bio_driver1 = fd;
 1482         if (bp->bio_cmd == BIO_GETATTR) {
 1483                 if (g_handleattr_int(bp, "GEOM::fwsectors", fd->ft->sectrac))
 1484                         return;
 1485                 if (g_handleattr_int(bp, "GEOM::fwheads", fd->ft->heads))
 1486                         return;
 1487                 g_io_deliver(bp, ENOIOCTL);
 1488                 return;
 1489         }
 1490         if (!(bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE)) {
 1491                 g_io_deliver(bp, EOPNOTSUPP);
 1492                 return;
 1493         }
 1494         bp->bio_pblkno = bp->bio_offset / fd->sectorsize;
 1495         bp->bio_resid = bp->bio_length;
 1496         fd_enqueue(fd, bp);
 1497         return;
 1498 }
 1499 
 1500 static int
 1501 fd_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
 1502 {
 1503         struct fd_data *fd;
 1504         struct fdc_status *fsp;
 1505         struct fdc_readid *rid;
 1506         int error;
 1507 
 1508         fd = pp->geom->softc;
 1509 
 1510         switch (cmd) {
 1511         case FD_GTYPE:                  /* get drive type */
 1512                 *(struct fd_type *)data = *fd->ft;
 1513                 return (0);
 1514 
 1515         case FD_STYPE:                  /* set drive type */
 1516                 /*
 1517                  * Allow setting drive type temporarily iff
 1518                  * currently unset.  Used for fdformat so any
 1519                  * user can set it, and then start formatting.
 1520                  */
 1521                 fd->fts = *(struct fd_type *)data;
 1522                 if (fd->fts.sectrac) {
 1523                         /* XXX: check for rubbish */
 1524                         fdsettype(fd, &fd->fts);
 1525                 } else {
 1526                         fdsettype(fd, fd_native_types[fd->type]);
 1527                 }
 1528                 if (debugflags & 0x40)
 1529                         fdprinttype(fd->ft);
 1530                 return (0);
 1531 
 1532         case FD_GOPTS:                  /* get drive options */
 1533                 *(int *)data = fd->options;
 1534                 return (0);
 1535 
 1536         case FD_SOPTS:                  /* set drive options */
 1537                 fd->options = *(int *)data;
 1538                 return (0);
 1539 
 1540         case FD_CLRERR:
 1541                 error = priv_check(td, PRIV_DRIVER);
 1542                 if (error)
 1543                         return (error);
 1544                 fd->fdc->fdc_errs = 0;
 1545                 return (0);
 1546 
 1547         case FD_GSTAT:
 1548                 fsp = (struct fdc_status *)data;
 1549                 if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
 1550                         return (EINVAL);
 1551                 memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
 1552                 return (0);
 1553 
 1554         case FD_GDTYPE:
 1555                 *(enum fd_drivetype *)data = fd->type;
 1556                 return (0);
 1557 
 1558         case FD_FORM:
 1559                 if (!(fflag & FWRITE))
 1560                         return (EPERM);
 1561                 if (((struct fd_formb *)data)->format_version !=
 1562                     FD_FORMAT_VERSION)
 1563                         return (EINVAL); /* wrong version of formatting prog */
 1564                 error = fdmisccmd(fd, BIO_FMT, data);
 1565                 mtx_lock(&fd->fdc->fdc_mtx);
 1566                 fd->flags |= FD_NEWDISK;
 1567                 mtx_unlock(&fd->fdc->fdc_mtx);
 1568                 break;
 1569 
 1570         case FD_READID:
 1571                 rid = (struct fdc_readid *)data;
 1572                 if (rid->cyl > 85 || rid->head > 1)
 1573                         return (EINVAL);
 1574                 error = fdmisccmd(fd, BIO_RDID, data);
 1575                 break;
 1576 
 1577         case FIONBIO:
 1578         case FIOASYNC:
 1579                 /* For backwards compat with old fd*(8) tools */
 1580                 error = 0;
 1581                 break;
 1582 
 1583         default:
 1584                 if (debugflags & 0x80)
 1585                         printf("Unknown ioctl %lx\n", cmd);
 1586                 error = ENOIOCTL;
 1587                 break;
 1588         }
 1589         return (error);
 1590 };
 1591 
 1592 
 1593 
 1594 /*
 1595  * Configuration/initialization stuff, per controller.
 1596  */
 1597 
 1598 devclass_t fdc_devclass;
 1599 static devclass_t fd_devclass;
 1600 
 1601 struct fdc_ivars {
 1602         int     fdunit;
 1603         int     fdtype;
 1604 };
 1605 
 1606 void
 1607 fdc_release_resources(struct fdc_data *fdc)
 1608 {
 1609         device_t dev;
 1610         struct resource *last;
 1611         int i;
 1612 
 1613         dev = fdc->fdc_dev;
 1614         if (fdc->fdc_intr)
 1615                 bus_teardown_intr(dev, fdc->res_irq, fdc->fdc_intr);
 1616         fdc->fdc_intr = NULL;
 1617         if (fdc->res_irq != NULL)
 1618                 bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
 1619                     fdc->res_irq);
 1620         fdc->res_irq = NULL;
 1621         last = NULL;
 1622         for (i = 0; i < FDC_MAXREG; i++) {
 1623                 if (fdc->resio[i] != NULL && fdc->resio[i] != last) {
 1624                         bus_release_resource(dev, SYS_RES_IOPORT,
 1625                             fdc->ridio[i], fdc->resio[i]);
 1626                         last = fdc->resio[i];
 1627                         fdc->resio[i] = NULL;
 1628                 }
 1629         }
 1630         if (fdc->res_drq != NULL)
 1631                 bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
 1632                     fdc->res_drq);
 1633         fdc->res_drq = NULL;
 1634 }
 1635 
 1636 int
 1637 fdc_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
 1638 {
 1639         struct fdc_ivars *ivars = device_get_ivars(child);
 1640 
 1641         switch (which) {
 1642         case FDC_IVAR_FDUNIT:
 1643                 *result = ivars->fdunit;
 1644                 break;
 1645         case FDC_IVAR_FDTYPE:
 1646                 *result = ivars->fdtype;
 1647                 break;
 1648         default:
 1649                 return (ENOENT);
 1650         }
 1651         return (0);
 1652 }
 1653 
 1654 int
 1655 fdc_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
 1656 {
 1657         struct fdc_ivars *ivars = device_get_ivars(child);
 1658 
 1659         switch (which) {
 1660         case FDC_IVAR_FDUNIT:
 1661                 ivars->fdunit = value;
 1662                 break;
 1663         case FDC_IVAR_FDTYPE:
 1664                 ivars->fdtype = value;
 1665                 break;
 1666         default:
 1667                 return (ENOENT);
 1668         }
 1669         return (0);
 1670 }
 1671 
 1672 int
 1673 fdc_initial_reset(device_t dev, struct fdc_data *fdc)
 1674 {
 1675         int ic_type, part_id;
 1676 
 1677         /*
 1678          * A status value of 0xff is very unlikely, but not theoretically
 1679          * impossible, but it is far more likely to indicate an empty bus.
 1680          */
 1681         if (fdsts_rd(fdc) == 0xff)
 1682                 return (ENXIO);
 1683 
 1684         /*
 1685          * Assert a reset to the floppy controller and check that the status
 1686          * register goes to zero.
 1687          */
 1688         fdout_wr(fdc, 0);
 1689         fdout_wr(fdc, 0);
 1690         if (fdsts_rd(fdc) != 0)
 1691                 return (ENXIO);
 1692 
 1693         /*
 1694          * Clear the reset and see it come ready.
 1695          */
 1696         fdout_wr(fdc, FDO_FRST);
 1697         DELAY(100);
 1698         if (fdsts_rd(fdc) != 0x80)
 1699                 return (ENXIO);
 1700 
 1701         /* Then, see if it can handle a command. */
 1702         if (fdc_cmd(fdc, 3, NE7CMD_SPECIFY, NE7_SPEC_1(6, 240),
 1703             NE7_SPEC_2(31, 0), 0))
 1704                 return (ENXIO);
 1705 
 1706         /*
 1707          * Try to identify the chip.
 1708          *
 1709          * The i8272 datasheet documents that unknown commands
 1710          * will return ST0 as 0x80.  The i8272 is supposedly identical
 1711          * to the NEC765.
 1712          * The i82077SL datasheet says 0x90 for the VERSION command,
 1713          * and several "superio" chips emulate this.
 1714          */
 1715         if (fdc_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type))
 1716                 return (ENXIO);
 1717         if (fdc_cmd(fdc, 1, 0x18, 1, &part_id))
 1718                 return (ENXIO);
 1719         if (bootverbose)
 1720                 device_printf(dev,
 1721                     "ic_type %02x part_id %02x\n", ic_type, part_id);
 1722         switch (ic_type & 0xff) {
 1723         case 0x80:
 1724                 device_set_desc(dev, "NEC 765 or clone");
 1725                 fdc->fdct = FDC_NE765;
 1726                 break;
 1727         case 0x81:
 1728         case 0x90:
 1729                 device_set_desc(dev,
 1730                     "Enhanced floppy controller");
 1731                 fdc->fdct = FDC_ENHANCED;
 1732                 break;
 1733         default:
 1734                 device_set_desc(dev, "Generic floppy controller");
 1735                 fdc->fdct = FDC_UNKNOWN;
 1736                 break;
 1737         }
 1738         return (0);
 1739 }
 1740 
 1741 int
 1742 fdc_detach(device_t dev)
 1743 {
 1744         struct  fdc_data *fdc;
 1745         int     error;
 1746 
 1747         fdc = device_get_softc(dev);
 1748 
 1749         /* have our children detached first */
 1750         if ((error = bus_generic_detach(dev)))
 1751                 return (error);
 1752 
 1753         if (fdc->fdc_intr)
 1754                 bus_teardown_intr(dev, fdc->res_irq, fdc->fdc_intr);
 1755         fdc->fdc_intr = NULL;
 1756 
 1757         /* kill worker thread */
 1758         mtx_lock(&fdc->fdc_mtx);
 1759         fdc->flags |= FDC_KTHREAD_EXIT;
 1760         wakeup(&fdc->head);
 1761         while ((fdc->flags & FDC_KTHREAD_ALIVE) != 0)
 1762                 msleep(fdc->fdc_thread, &fdc->fdc_mtx, PRIBIO, "fdcdet", 0);
 1763         mtx_unlock(&fdc->fdc_mtx);
 1764 
 1765         /* reset controller, turn motor off */
 1766         fdout_wr(fdc, 0);
 1767 
 1768         if (!(fdc->flags & FDC_NODMA))
 1769                 isa_dma_release(fdc->dmachan);
 1770         fdc_release_resources(fdc);
 1771         mtx_destroy(&fdc->fdc_mtx);
 1772         return (0);
 1773 }
 1774 
 1775 /*
 1776  * Add a child device to the fdc controller.  It will then be probed etc.
 1777  */
 1778 device_t
 1779 fdc_add_child(device_t dev, const char *name, int unit)
 1780 {
 1781         struct fdc_ivars *ivar;
 1782         device_t child;
 1783 
 1784         ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_NOWAIT | M_ZERO);
 1785         if (ivar == NULL)
 1786                 return (NULL);
 1787         child = device_add_child(dev, name, unit);
 1788         if (child == NULL) {
 1789                 free(ivar, M_DEVBUF);
 1790                 return (NULL);
 1791         }
 1792         device_set_ivars(child, ivar);
 1793         ivar->fdunit = unit;
 1794         ivar->fdtype = FDT_NONE;
 1795         if (resource_disabled(name, unit))
 1796                 device_disable(child);
 1797         return (child);
 1798 }
 1799 
 1800 int
 1801 fdc_attach(device_t dev)
 1802 {
 1803         struct  fdc_data *fdc;
 1804         int     error;
 1805 
 1806         fdc = device_get_softc(dev);
 1807         fdc->fdc_dev = dev;
 1808         error = fdc_initial_reset(dev, fdc);
 1809         if (error) {
 1810                 device_printf(dev, "does not respond\n");
 1811                 return (error);
 1812         }
 1813         error = bus_setup_intr(dev, fdc->res_irq,
 1814             INTR_TYPE_BIO | INTR_ENTROPY | 
 1815             ((fdc->flags & FDC_NOFAST) ? INTR_MPSAFE : 0),                     
 1816             ((fdc->flags & FDC_NOFAST) ? NULL : fdc_intr_fast),             
 1817             ((fdc->flags & FDC_NOFAST) ? fdc_intr : NULL), 
 1818                                fdc, &fdc->fdc_intr);
 1819         if (error) {
 1820                 device_printf(dev, "cannot setup interrupt\n");
 1821                 return (error);
 1822         }
 1823         if (!(fdc->flags & FDC_NODMA)) {
 1824                 error = isa_dma_acquire(fdc->dmachan);
 1825                 if (!error) {
 1826                         error = isa_dma_init(fdc->dmachan,
 1827                             MAX_BYTES_PER_CYL, M_WAITOK);
 1828                         if (error)
 1829                                 isa_dma_release(fdc->dmachan);
 1830                 }
 1831                 if (error)
 1832                         return (error);
 1833         }
 1834         fdc->fdcu = device_get_unit(dev);
 1835         fdc->flags |= FDC_NEEDS_RESET;
 1836 
 1837         mtx_init(&fdc->fdc_mtx, "fdc lock", NULL, MTX_DEF);
 1838 
 1839         /* reset controller, turn motor off, clear fdout mirror reg */
 1840         fdout_wr(fdc, fdc->fdout = 0);
 1841         bioq_init(&fdc->head);
 1842 
 1843         settle = hz / 8;
 1844 
 1845         return (0);
 1846 }
 1847 
 1848 void
 1849 fdc_start_worker(device_t dev)
 1850 {
 1851         struct  fdc_data *fdc;
 1852 
 1853         fdc = device_get_softc(dev);
 1854         kproc_create(fdc_thread, fdc, &fdc->fdc_thread, 0, 0,
 1855             "fdc%d", device_get_unit(dev));
 1856 }
 1857 
 1858 int
 1859 fdc_hints_probe(device_t dev)
 1860 {
 1861         const char *name, *dname;
 1862         int i, error, dunit;
 1863 
 1864         /*
 1865          * Probe and attach any children.  We should probably detect
 1866          * devices from the BIOS unless overridden.
 1867          */
 1868         name = device_get_nameunit(dev);
 1869         i = 0;
 1870         while ((resource_find_match(&i, &dname, &dunit, "at", name)) == 0) {
 1871                 resource_int_value(dname, dunit, "drive", &dunit);
 1872                 fdc_add_child(dev, dname, dunit);
 1873         }
 1874 
 1875         if ((error = bus_generic_attach(dev)) != 0)
 1876                 return (error);
 1877         return (0);
 1878 }
 1879 
 1880 int
 1881 fdc_print_child(device_t me, device_t child)
 1882 {
 1883         int retval = 0, flags;
 1884 
 1885         retval += bus_print_child_header(me, child);
 1886         retval += printf(" on %s drive %d", device_get_nameunit(me),
 1887                fdc_get_fdunit(child));
 1888         if ((flags = device_get_flags(me)) != 0)
 1889                 retval += printf(" flags %#x", flags);
 1890         retval += printf("\n");
 1891 
 1892         return (retval);
 1893 }
 1894 
 1895 /*
 1896  * Configuration/initialization, per drive.
 1897  */
 1898 static int
 1899 fd_probe(device_t dev)
 1900 {
 1901         int     unit;
 1902         int     i;
 1903         u_int   st0, st3;
 1904         struct  fd_data *fd;
 1905         struct  fdc_data *fdc;
 1906         int     fdsu;
 1907         int     flags, type;
 1908 
 1909         fdsu = fdc_get_fdunit(dev);
 1910         fd = device_get_softc(dev);
 1911         fdc = device_get_softc(device_get_parent(dev));
 1912         flags = device_get_flags(dev);
 1913 
 1914         fd->dev = dev;
 1915         fd->fdc = fdc;
 1916         fd->fdsu = fdsu;
 1917         unit = device_get_unit(dev);
 1918 
 1919         /* Auto-probe if fdinfo is present, but always allow override. */
 1920         type = flags & FD_TYPEMASK;
 1921         if (type == FDT_NONE && (type = fdc_get_fdtype(dev)) != FDT_NONE) {
 1922                 fd->type = type;
 1923                 goto done;
 1924         } else {
 1925                 /* make sure fdautoselect() will be called */
 1926                 fd->flags = FD_EMPTY;
 1927                 fd->type = type;
 1928         }
 1929 
 1930 #if defined(__i386__) || defined(__amd64__)
 1931         if (fd->type == FDT_NONE && (unit == 0 || unit == 1)) {
 1932                 /* Look up what the BIOS thinks we have. */
 1933                 if (unit == 0)
 1934                         fd->type = (rtcin(RTC_FDISKETTE) & 0xf0) >> 4;
 1935                 else
 1936                         fd->type = rtcin(RTC_FDISKETTE) & 0x0f;
 1937                 if (fd->type == FDT_288M_1)
 1938                         fd->type = FDT_288M;
 1939         }
 1940 #endif /* __i386__ || __amd64__ */
 1941         /* is there a unit? */
 1942         if (fd->type == FDT_NONE)
 1943                 return (ENXIO);
 1944 
 1945         mtx_lock(&fdc->fdc_mtx);
 1946 
 1947         /* select it */
 1948         fd_select(fd);
 1949         fd_motor(fd, 1);
 1950         fdc->fd = fd;
 1951         fdc_reset(fdc);         /* XXX reset, then unreset, etc. */
 1952         DELAY(1000000); /* 1 sec */
 1953 
 1954         if ((flags & FD_NO_PROBE) == 0) {
 1955                 /* If we're at track 0 first seek inwards. */
 1956                 if ((fdc_sense_drive(fdc, &st3) == 0) &&
 1957                     (st3 & NE7_ST3_T0)) {
 1958                         /* Seek some steps... */
 1959                         if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
 1960                                 /* ...wait a moment... */
 1961                                 DELAY(300000);
 1962                                 /* make ctrlr happy: */
 1963                                 fdc_sense_int(fdc, NULL, NULL);
 1964                         }
 1965                 }
 1966 
 1967                 for (i = 0; i < 2; i++) {
 1968                         /*
 1969                          * we must recalibrate twice, just in case the
 1970                          * heads have been beyond cylinder 76, since
 1971                          * most FDCs still barf when attempting to
 1972                          * recalibrate more than 77 steps
 1973                          */
 1974                         /* go back to 0: */
 1975                         if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
 1976                                 /* a second being enough for full stroke seek*/
 1977                                 DELAY(i == 0 ? 1000000 : 300000);
 1978 
 1979                                 /* anything responding? */
 1980                                 if (fdc_sense_int(fdc, &st0, NULL) == 0 &&
 1981                                     (st0 & NE7_ST0_EC) == 0)
 1982                                         break; /* already probed successfully */
 1983                         }
 1984                 }
 1985         }
 1986 
 1987         fd_motor(fd, 0);
 1988         fdc->fd = NULL;
 1989         mtx_unlock(&fdc->fdc_mtx);
 1990 
 1991         if ((flags & FD_NO_PROBE) == 0 &&
 1992             (st0 & NE7_ST0_EC) != 0) /* no track 0 -> no drive present */
 1993                 return (ENXIO);
 1994 
 1995 done:
 1996 
 1997         switch (fd->type) {
 1998         case FDT_12M:
 1999                 device_set_desc(dev, "1200-KB 5.25\" drive");
 2000                 break;
 2001         case FDT_144M:
 2002                 device_set_desc(dev, "1440-KB 3.5\" drive");
 2003                 break;
 2004         case FDT_288M:
 2005                 device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
 2006                 break;
 2007         case FDT_360K:
 2008                 device_set_desc(dev, "360-KB 5.25\" drive");
 2009                 break;
 2010         case FDT_720K:
 2011                 device_set_desc(dev, "720-KB 3.5\" drive");
 2012                 break;
 2013         default:
 2014                 return (ENXIO);
 2015         }
 2016         fd->track = FD_NO_TRACK;
 2017         fd->fdc = fdc;
 2018         fd->fdsu = fdsu;
 2019         fd->options = 0;
 2020         callout_init_mtx(&fd->toffhandle, &fd->fdc->fdc_mtx, 0);
 2021 
 2022         /* initialize densities for subdevices */
 2023         fdsettype(fd, fd_native_types[fd->type]);
 2024         return (0);
 2025 }
 2026 
 2027 /*
 2028  * We have to do this in a geom event because GEOM is not running
 2029  * when fd_attach() is.
 2030  * XXX: move fd_attach after geom like ata/scsi disks
 2031  */
 2032 static void
 2033 fd_attach2(void *arg, int flag)
 2034 {
 2035         struct  fd_data *fd;
 2036 
 2037         fd = arg;
 2038 
 2039         fd->fd_geom = g_new_geomf(&g_fd_class,
 2040             "fd%d", device_get_unit(fd->dev));
 2041         fd->fd_provider = g_new_providerf(fd->fd_geom, "%s", fd->fd_geom->name);
 2042         fd->fd_geom->softc = fd;
 2043         g_error_provider(fd->fd_provider, 0);
 2044 }
 2045 
 2046 static int
 2047 fd_attach(device_t dev)
 2048 {
 2049         struct  fd_data *fd;
 2050 
 2051         fd = device_get_softc(dev);
 2052         g_post_event(fd_attach2, fd, M_WAITOK, NULL);
 2053         fd->flags |= FD_EMPTY;
 2054         bioq_init(&fd->fd_bq);
 2055 
 2056         return (0);
 2057 }
 2058 
 2059 static void
 2060 fd_detach_geom(void *arg, int flag)
 2061 {
 2062         struct  fd_data *fd = arg;
 2063 
 2064         g_topology_assert();
 2065         g_wither_geom(fd->fd_geom, ENXIO);
 2066 }
 2067 
 2068 static int
 2069 fd_detach(device_t dev)
 2070 {
 2071         struct  fd_data *fd;
 2072 
 2073         fd = device_get_softc(dev);
 2074         g_waitfor_event(fd_detach_geom, fd, M_WAITOK, NULL);
 2075         while (device_get_state(dev) == DS_BUSY)
 2076                 tsleep(fd, PZERO, "fdd", hz/10);
 2077         callout_drain(&fd->toffhandle);
 2078 
 2079         return (0);
 2080 }
 2081 
 2082 static device_method_t fd_methods[] = {
 2083         /* Device interface */
 2084         DEVMETHOD(device_probe,         fd_probe),
 2085         DEVMETHOD(device_attach,        fd_attach),
 2086         DEVMETHOD(device_detach,        fd_detach),
 2087         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
 2088         DEVMETHOD(device_suspend,       bus_generic_suspend), /* XXX */
 2089         DEVMETHOD(device_resume,        bus_generic_resume), /* XXX */
 2090         { 0, 0 }
 2091 };
 2092 
 2093 static driver_t fd_driver = {
 2094         "fd",
 2095         fd_methods,
 2096         sizeof(struct fd_data)
 2097 };
 2098 
 2099 static int
 2100 fdc_modevent(module_t mod, int type, void *data)
 2101 {
 2102 
 2103         return (g_modevent(NULL, type, &g_fd_class));
 2104 }
 2105 
 2106 DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, fdc_modevent, 0);

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