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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FreeBSD/Linux Kernel Cross Reference
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("$FreeBSD$");
   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         bool    gone;
  265 };
  266 
  267 #define FD_NOT_VALID -2
  268 
  269 static driver_intr_t fdc_intr;
  270 static driver_filter_t fdc_intr_fast;
  271 static void fdc_reset(struct fdc_data *);
  272 static int fd_probe_disk(struct fd_data *, int *);
  273 
  274 static SYSCTL_NODE(_debug, OID_AUTO, fdc, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
  275     "fdc driver");
  276 
  277 static int fifo_threshold = 8;
  278 SYSCTL_INT(_debug_fdc, OID_AUTO, fifo, CTLFLAG_RW, &fifo_threshold, 0,
  279         "FIFO threshold setting");
  280 
  281 static int debugflags = 0;
  282 SYSCTL_INT(_debug_fdc, OID_AUTO, debugflags, CTLFLAG_RW, &debugflags, 0,
  283         "Debug flags");
  284 
  285 static int retries = 10;
  286 SYSCTL_INT(_debug_fdc, OID_AUTO, retries, CTLFLAG_RW, &retries, 0,
  287         "Number of retries to attempt");
  288 
  289 static int spec1 = NE7_SPEC_1(6, 240);
  290 SYSCTL_INT(_debug_fdc, OID_AUTO, spec1, CTLFLAG_RW, &spec1, 0,
  291         "Specification byte one (step-rate + head unload)");
  292 
  293 static int spec2 = NE7_SPEC_2(16, 0);
  294 SYSCTL_INT(_debug_fdc, OID_AUTO, spec2, CTLFLAG_RW, &spec2, 0,
  295         "Specification byte two (head load time + no-dma)");
  296 
  297 static int settle;
  298 SYSCTL_INT(_debug_fdc, OID_AUTO, settle, CTLFLAG_RW, &settle, 0,
  299         "Head settling time in sec/hz");
  300 
  301 static void
  302 fdprinttype(struct fd_type *ft)
  303 {
  304 
  305         printf("(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,0x%x)",
  306             ft->sectrac, ft->secsize, ft->datalen, ft->gap, ft->tracks,
  307             ft->size, ft->trans, ft->heads, ft->f_gap, ft->f_inter,
  308             ft->offset_side2, ft->flags);
  309 }
  310 
  311 static void
  312 fdsettype(struct fd_data *fd, struct fd_type *ft)
  313 {
  314         fd->ft = ft;
  315         ft->size = ft->sectrac * ft->heads * ft->tracks;
  316         fd->sectorsize = 128 << fd->ft->secsize;
  317 }
  318 
  319 /*
  320  * Bus space handling (access to low-level IO).
  321  */
  322 static inline void
  323 fdregwr(struct fdc_data *fdc, int reg, uint8_t v)
  324 {
  325 
  326         bus_space_write_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg], v);
  327 }
  328 
  329 static inline uint8_t
  330 fdregrd(struct fdc_data *fdc, int reg)
  331 {
  332 
  333         return bus_space_read_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg]);
  334 }
  335 
  336 static void
  337 fdctl_wr(struct fdc_data *fdc, u_int8_t v)
  338 {
  339 
  340         fdregwr(fdc, FDCTL, v);
  341 }
  342 
  343 static void
  344 fdout_wr(struct fdc_data *fdc, u_int8_t v)
  345 {
  346 
  347         fdregwr(fdc, FDOUT, v);
  348 }
  349 
  350 static u_int8_t
  351 fdsts_rd(struct fdc_data *fdc)
  352 {
  353 
  354         return fdregrd(fdc, FDSTS);
  355 }
  356 
  357 static void
  358 fddsr_wr(struct fdc_data *fdc, u_int8_t v)
  359 {
  360 
  361         fdregwr(fdc, FDDSR, v);
  362 }
  363 
  364 static void
  365 fddata_wr(struct fdc_data *fdc, u_int8_t v)
  366 {
  367 
  368         fdregwr(fdc, FDDATA, v);
  369 }
  370 
  371 static u_int8_t
  372 fddata_rd(struct fdc_data *fdc)
  373 {
  374 
  375         return fdregrd(fdc, FDDATA);
  376 }
  377 
  378 static u_int8_t
  379 fdin_rd(struct fdc_data *fdc)
  380 {
  381 
  382         return fdregrd(fdc, FDCTL);
  383 }
  384 
  385 /*
  386  * Magic pseudo-DMA initialization for YE FDC. Sets count and
  387  * direction.
  388  */
  389 static void
  390 fdbcdr_wr(struct fdc_data *fdc, int iswrite, uint16_t count)
  391 {
  392         fdregwr(fdc, FDBCDR, (count - 1) & 0xff);
  393         fdregwr(fdc, FDBCDR + 1,
  394             (iswrite ? 0x80 : 0) | (((count - 1) >> 8) & 0x7f));
  395 }
  396 
  397 static int
  398 fdc_err(struct fdc_data *fdc, const char *s)
  399 {
  400         fdc->fdc_errs++;
  401         if (s) {
  402                 if (fdc->fdc_errs < FDC_ERRMAX)
  403                         device_printf(fdc->fdc_dev, "%s", s);
  404                 else if (fdc->fdc_errs == FDC_ERRMAX)
  405                         device_printf(fdc->fdc_dev, "too many errors, not "
  406                                                     "logging any more\n");
  407         }
  408 
  409         return (1);
  410 }
  411 
  412 /*
  413  * FDC IO functions, take care of the main status register, timeout
  414  * in case the desired status bits are never set.
  415  *
  416  * These PIO loops initially start out with short delays between
  417  * each iteration in the expectation that the required condition
  418  * is usually met quickly, so it can be handled immediately.
  419  */
  420 static int
  421 fdc_in(struct fdc_data *fdc, int *ptr)
  422 {
  423         int i, j, step;
  424 
  425         step = 1;
  426         for (j = 0; j < FDSTS_TIMEOUT; j += step) {
  427                 i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
  428                 if (i == (NE7_DIO|NE7_RQM)) {
  429                         i = fddata_rd(fdc);
  430                         if (ptr)
  431                                 *ptr = i;
  432                         return (0);
  433                 }
  434                 if (i == NE7_RQM)
  435                         return (fdc_err(fdc, "ready for output in input\n"));
  436                 step += step;
  437                 DELAY(step);
  438         }
  439         return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
  440 }
  441 
  442 static int
  443 fdc_out(struct fdc_data *fdc, int x)
  444 {
  445         int i, j, step;
  446 
  447         step = 1;
  448         for (j = 0; j < FDSTS_TIMEOUT; j += step) {
  449                 i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
  450                 if (i == NE7_RQM) {
  451                         fddata_wr(fdc, x);
  452                         return (0);
  453                 }
  454                 if (i == (NE7_DIO|NE7_RQM))
  455                         return (fdc_err(fdc, "ready for input in output\n"));
  456                 step += step;
  457                 DELAY(step);
  458         }
  459         return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
  460 }
  461 
  462 /*
  463  * fdc_cmd: Send a command to the chip.
  464  * Takes a varargs with this structure:
  465  *      # of output bytes
  466  *      output bytes as int [...]
  467  *      # of input bytes
  468  *      input bytes as int* [...]
  469  */
  470 static int
  471 fdc_cmd(struct fdc_data *fdc, int n_out, ...)
  472 {
  473         u_char cmd = 0;
  474         int n_in;
  475         int n, i;
  476         va_list ap;
  477 
  478         va_start(ap, n_out);
  479         for (n = 0; n < n_out; n++) {
  480                 i = va_arg(ap, int);
  481                 if (n == 0)
  482                         cmd = i;
  483                 if (fdc_out(fdc, i) < 0) {
  484                         char msg[50];
  485                         snprintf(msg, sizeof(msg),
  486                                 "cmd %x failed at out byte %d of %d\n",
  487                                 cmd, n + 1, n_out);
  488                         fdc->flags |= FDC_NEEDS_RESET;
  489                         va_end(ap);
  490                         return fdc_err(fdc, msg);
  491                 }
  492         }
  493         n_in = va_arg(ap, int);
  494         for (n = 0; n < n_in; n++) {
  495                 int *ptr = va_arg(ap, int *);
  496                 if (fdc_in(fdc, ptr) != 0) {
  497                         char msg[50];
  498                         snprintf(msg, sizeof(msg),
  499                                 "cmd %02x failed at in byte %d of %d\n",
  500                                 cmd, n + 1, n_in);
  501                         fdc->flags |= FDC_NEEDS_RESET;
  502                         va_end(ap);
  503                         return fdc_err(fdc, msg);
  504                 }
  505         }
  506         va_end(ap);
  507         return (0);
  508 }
  509 
  510 static void
  511 fdc_reset(struct fdc_data *fdc)
  512 {
  513         int i, r[10];
  514 
  515         if (fdc->fdct == FDC_ENHANCED) {
  516                 /* Try a software reset, default precomp, and 500 kb/s */
  517                 fddsr_wr(fdc, I8207X_DSR_SR);
  518         } else {
  519                 /* Try a hardware reset, keep motor on */
  520                 fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
  521                 DELAY(100);
  522                 /* enable FDC, but defer interrupts a moment */
  523                 fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
  524         }
  525         DELAY(100);
  526         fdout_wr(fdc, fdc->fdout);
  527 
  528         /* XXX after a reset, silently believe the FDC will accept commands */
  529         if (fdc_cmd(fdc, 3, NE7CMD_SPECIFY, spec1, spec2, 0))
  530                 device_printf(fdc->fdc_dev, " SPECIFY failed in reset\n");
  531 
  532         if (fdc->fdct == FDC_ENHANCED) {
  533                 if (fdc_cmd(fdc, 4,
  534                     I8207X_CONFIG,
  535                     0,
  536                     /* 0x40 | */                /* Enable Implied Seek -
  537                                                  * breaks 2step! */
  538                     0x10 |                      /* Polling disabled */
  539                     (fifo_threshold - 1),       /* Fifo threshold */
  540                     0x00,                       /* Precomp track */
  541                     0))
  542                         device_printf(fdc->fdc_dev,
  543                             " CONFIGURE failed in reset\n");
  544                 if (debugflags & 1) {
  545                         if (fdc_cmd(fdc, 1,
  546                             I8207X_DUMPREG,
  547                             10, &r[0], &r[1], &r[2], &r[3], &r[4],
  548                             &r[5], &r[6], &r[7], &r[8], &r[9]))
  549                                 device_printf(fdc->fdc_dev,
  550                                     " DUMPREG failed in reset\n");
  551                         for (i = 0; i < 10; i++)
  552                                 printf(" %02x", r[i]);
  553                         printf("\n");
  554                 }
  555         }
  556 }
  557 
  558 static int
  559 fdc_sense_drive(struct fdc_data *fdc, int *st3p)
  560 {
  561         int st3;
  562 
  563         if (fdc_cmd(fdc, 2, NE7CMD_SENSED, fdc->fd->fdsu, 1, &st3))
  564                 return (fdc_err(fdc, "Sense Drive Status failed\n"));
  565         if (st3p)
  566                 *st3p = st3;
  567         return (0);
  568 }
  569 
  570 static int
  571 fdc_sense_int(struct fdc_data *fdc, int *st0p, int *cylp)
  572 {
  573         int cyl, st0, ret;
  574 
  575         ret = fdc_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
  576         if (ret) {
  577                 (void)fdc_err(fdc, "sense intr err reading stat reg 0\n");
  578                 return (ret);
  579         }
  580 
  581         if (st0p)
  582                 *st0p = st0;
  583 
  584         if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
  585                 /*
  586                  * There doesn't seem to have been an interrupt.
  587                  */
  588                 return (FD_NOT_VALID);
  589         }
  590 
  591         if (fdc_in(fdc, &cyl) != 0)
  592                 return fdc_err(fdc, "can't get cyl num\n");
  593 
  594         if (cylp)
  595                 *cylp = cyl;
  596 
  597         return (0);
  598 }
  599 
  600 static int
  601 fdc_read_status(struct fdc_data *fdc)
  602 {
  603         int i, ret, status;
  604 
  605         for (i = ret = 0; i < 7; i++) {
  606                 ret = fdc_in(fdc, &status);
  607                 fdc->status[i] = status;
  608                 if (ret != 0)
  609                         break;
  610         }
  611 
  612         if (ret == 0)
  613                 fdc->flags |= FDC_STAT_VALID;
  614         else
  615                 fdc->flags &= ~FDC_STAT_VALID;
  616 
  617         return ret;
  618 }
  619 
  620 /*
  621  * Select this drive
  622  */
  623 static void
  624 fd_select(struct fd_data *fd)
  625 {
  626         struct fdc_data *fdc;
  627 
  628         /* XXX: lock controller */
  629         fdc = fd->fdc;
  630         fdc->fdout &= ~FDO_FDSEL;
  631         fdc->fdout |= FDO_FDMAEN | FDO_FRST | fd->fdsu;
  632         fdout_wr(fdc, fdc->fdout);
  633 }
  634 
  635 static void
  636 fd_turnon(void *arg)
  637 {
  638         struct fd_data *fd;
  639         struct bio *bp;
  640         int once;
  641 
  642         fd = arg;
  643         mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
  644         fd->flags &= ~FD_MOTORWAIT;
  645         fd->flags |= FD_MOTOR;
  646         once = 0;
  647         for (;;) {
  648                 bp = bioq_takefirst(&fd->fd_bq);
  649                 if (bp == NULL)
  650                         break;
  651                 bioq_disksort(&fd->fdc->head, bp);
  652                 once = 1;
  653         }
  654         if (once)
  655                 wakeup(&fd->fdc->head);
  656 }
  657 
  658 static void
  659 fd_motor(struct fd_data *fd, int turnon)
  660 {
  661         struct fdc_data *fdc;
  662 
  663         fdc = fd->fdc;
  664 /*
  665         mtx_assert(&fdc->fdc_mtx, MA_OWNED);
  666 */
  667         if (turnon) {
  668                 fd->flags |= FD_MOTORWAIT;
  669                 fdc->fdout |= (FDO_MOEN0 << fd->fdsu);
  670                 callout_reset(&fd->toffhandle, hz, fd_turnon, fd);
  671         } else {
  672                 callout_stop(&fd->toffhandle);
  673                 fd->flags &= ~(FD_MOTOR|FD_MOTORWAIT);
  674                 fdc->fdout &= ~(FDO_MOEN0 << fd->fdsu);
  675         }
  676         fdout_wr(fdc, fdc->fdout);
  677 }
  678 
  679 static void
  680 fd_turnoff(void *xfd)
  681 {
  682         struct fd_data *fd = xfd;
  683 
  684         mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
  685         fd_motor(fd, 0);
  686 }
  687 
  688 /*
  689  * fdc_intr - wake up the worker thread.
  690  */
  691 
  692 static void
  693 fdc_intr(void *arg)
  694 {
  695 
  696         wakeup(arg);
  697 }
  698 
  699 static int
  700 fdc_intr_fast(void *arg)
  701 {
  702 
  703         wakeup(arg);
  704         return(FILTER_HANDLED);
  705 }
  706 
  707 /*
  708  * fdc_pio(): perform programmed IO read/write for YE PCMCIA floppy.
  709  */
  710 static void
  711 fdc_pio(struct fdc_data *fdc)
  712 {
  713         u_char *cptr;
  714         struct bio *bp;
  715         u_int count;
  716 
  717         bp = fdc->bp;
  718         cptr = fdc->fd->fd_ioptr;
  719         count = fdc->fd->fd_iosize;
  720 
  721         if (bp->bio_cmd == BIO_READ) {
  722                 fdbcdr_wr(fdc, 0, count);
  723                 bus_space_read_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
  724                     fdc->ioff[FD_YE_DATAPORT], cptr, count);
  725         } else {
  726                 bus_space_write_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
  727                     fdc->ioff[FD_YE_DATAPORT], cptr, count);
  728                 fdbcdr_wr(fdc, 0, count);       /* needed? */
  729         }
  730 }
  731 
  732 static int
  733 fdc_biodone(struct fdc_data *fdc, int error)
  734 {
  735         struct fd_data *fd;
  736         struct bio *bp;
  737 
  738         fd = fdc->fd;
  739         bp = fdc->bp;
  740 
  741         mtx_lock(&fdc->fdc_mtx);
  742         if (--fd->fd_iocount == 0)
  743                 callout_reset(&fd->toffhandle, 4 * hz, fd_turnoff, fd);
  744         fdc->bp = NULL;
  745         fdc->fd = NULL;
  746         mtx_unlock(&fdc->fdc_mtx);
  747         if (bp->bio_to != NULL) {
  748                 if ((debugflags & 2) && fd->fdc->retry > 0)
  749                         printf("retries: %d\n", fd->fdc->retry);
  750                 g_io_deliver(bp, error);
  751                 return (0);
  752         }
  753         bp->bio_error = error;
  754         bp->bio_flags |= BIO_DONE;
  755         wakeup(bp);
  756         return (0);
  757 }
  758 
  759 static int retry_line;
  760 
  761 static int
  762 fdc_worker(struct fdc_data *fdc)
  763 {
  764         struct fd_data *fd;
  765         struct bio *bp;
  766         int i, nsect;
  767         int st0, st3, cyl, mfm, steptrac, cylinder, descyl, sec;
  768         int head;
  769         int override_error;
  770         static int need_recal;
  771         struct fdc_readid *idp;
  772         struct fd_formb *finfo;
  773 
  774         override_error = 0;
  775 
  776         /* Have we exhausted our retries ? */
  777         bp = fdc->bp;
  778         fd = fdc->fd;
  779         if (bp != NULL &&
  780                 (fdc->retry >= retries || (fd->options & FDOPT_NORETRY))) {
  781                 if ((debugflags & 4))
  782                         printf("Too many retries (EIO)\n");
  783                 if (fdc->flags & FDC_NEEDS_RESET) {
  784                         mtx_lock(&fdc->fdc_mtx);
  785                         fd->flags |= FD_EMPTY;
  786                         mtx_unlock(&fdc->fdc_mtx);
  787                 }
  788                 return (fdc_biodone(fdc, EIO));
  789         }
  790 
  791         /* Disable ISADMA if we bailed while it was active */
  792         if (fd != NULL && (fd->flags & FD_ISADMA)) {
  793                 isa_dmadone(
  794                     bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
  795                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
  796                 mtx_lock(&fdc->fdc_mtx);
  797                 fd->flags &= ~FD_ISADMA;
  798                 mtx_unlock(&fdc->fdc_mtx);
  799         }
  800 
  801         /* Unwedge the controller ? */
  802         if (fdc->flags & FDC_NEEDS_RESET) {
  803                 fdc->flags &= ~FDC_NEEDS_RESET;
  804                 fdc_reset(fdc);
  805                 if (cold)
  806                         DELAY(1000000);
  807                 else
  808                         tsleep(fdc, PRIBIO, "fdcrst", hz);
  809                 /* Discard results */
  810                 for (i = 0; i < 4; i++)
  811                         fdc_sense_int(fdc, &st0, &cyl);
  812                 /* All drives must recal */
  813                 need_recal = 0xf;
  814         }
  815 
  816         /* Pick up a request, if need be wait for it */
  817         if (fdc->bp == NULL) {
  818                 mtx_lock(&fdc->fdc_mtx);
  819                 do {
  820                         fdc->bp = bioq_takefirst(&fdc->head);
  821                         if (fdc->bp == NULL)
  822                                 msleep(&fdc->head, &fdc->fdc_mtx,
  823                                     PRIBIO, "-", 0);
  824                 } while (fdc->bp == NULL &&
  825                     (fdc->flags & FDC_KTHREAD_EXIT) == 0);
  826                 mtx_unlock(&fdc->fdc_mtx);
  827 
  828                 if (fdc->bp == NULL)
  829                         /*
  830                          * Nothing to do, worker thread has been
  831                          * requested to stop.
  832                          */
  833                         return (0);
  834 
  835                 bp = fdc->bp;
  836                 fd = fdc->fd = bp->bio_driver1;
  837                 fdc->retry = 0;
  838                 fd->fd_ioptr = bp->bio_data;
  839                 if (bp->bio_cmd == BIO_FMT) {
  840                         i = offsetof(struct fd_formb, fd_formb_cylno(0));
  841                         fd->fd_ioptr += i;
  842                         fd->fd_iosize = bp->bio_length - i;
  843                 }
  844         }
  845 
  846         /* Select drive, setup params */
  847         fd_select(fd);
  848         if (fdc->fdct == FDC_ENHANCED)
  849                 fddsr_wr(fdc, fd->ft->trans);
  850         else
  851                 fdctl_wr(fdc, fd->ft->trans);
  852 
  853         if (bp->bio_cmd == BIO_PROBE) {
  854                 if ((!(device_get_flags(fd->dev) & FD_NO_CHLINE) &&
  855                     !(fdin_rd(fdc) & FDI_DCHG) &&
  856                     !(fd->flags & FD_EMPTY)) ||
  857                     fd_probe_disk(fd, &need_recal) == 0)
  858                         return (fdc_biodone(fdc, 0));
  859                 return (1);
  860         }
  861 
  862         /*
  863          * If we are dead just flush the requests
  864          */
  865         if (fd->flags & FD_EMPTY)
  866                 return (fdc_biodone(fdc, ENXIO));
  867 
  868         /* Check if we lost our media */
  869         if (fdin_rd(fdc) & FDI_DCHG) {
  870                 if (debugflags & 0x40)
  871                         printf("Lost disk\n");
  872                 mtx_lock(&fdc->fdc_mtx);
  873                 fd->flags |= FD_EMPTY;
  874                 fd->flags |= FD_NEWDISK;
  875                 mtx_unlock(&fdc->fdc_mtx);
  876                 g_topology_lock();
  877                 g_orphan_provider(fd->fd_provider, ENXIO);
  878                 fd->fd_provider->flags |= G_PF_WITHER;
  879                 fd->fd_provider =
  880                     g_new_providerf(fd->fd_geom, "%s", fd->fd_geom->name);
  881                 g_error_provider(fd->fd_provider, 0);
  882                 g_topology_unlock();
  883                 return (fdc_biodone(fdc, ENXIO));
  884         }
  885 
  886         /* Check if the floppy is write-protected */
  887         if (bp->bio_cmd == BIO_FMT || bp->bio_cmd == BIO_WRITE) {
  888                 retry_line = __LINE__;
  889                 if(fdc_sense_drive(fdc, &st3) != 0)
  890                         return (1);
  891                 if(st3 & NE7_ST3_WP)
  892                         return (fdc_biodone(fdc, EROFS));
  893         }
  894 
  895         mfm = (fd->ft->flags & FL_MFM)? NE7CMD_MFM: 0;
  896         steptrac = (fd->ft->flags & FL_2STEP)? 2: 1;
  897         i = fd->ft->sectrac * fd->ft->heads;
  898         cylinder = bp->bio_pblkno / i;
  899         descyl = cylinder * steptrac;
  900         sec = bp->bio_pblkno % i;
  901         nsect = i - sec;
  902         head = sec / fd->ft->sectrac;
  903         sec = sec % fd->ft->sectrac + 1;
  904 
  905         /* If everything is going swimmingly, use multisector xfer */
  906         if (fdc->retry == 0 &&
  907             (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE)) {
  908                 fd->fd_iosize = imin(nsect * fd->sectorsize, bp->bio_resid);
  909                 nsect = fd->fd_iosize / fd->sectorsize;
  910         } else if (bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE) {
  911                 fd->fd_iosize = fd->sectorsize;
  912                 nsect = 1;
  913         }
  914 
  915         /* Do RECAL if we need to or are going to track zero anyway */
  916         if ((need_recal & (1 << fd->fdsu)) ||
  917             (cylinder == 0 && fd->track != 0) ||
  918             fdc->retry > 2) {
  919                 retry_line = __LINE__;
  920                 if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
  921                         return (1);
  922                 tsleep(fdc, PRIBIO, "fdrecal", hz);
  923                 retry_line = __LINE__;
  924                 if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
  925                         return (1); /* XXX */
  926                 retry_line = __LINE__;
  927                 if ((st0 & 0xc0) || cyl != 0)
  928                         return (1);
  929                 need_recal &= ~(1 << fd->fdsu);
  930                 fd->track = 0;
  931                 /* let the heads settle */
  932                 if (settle)
  933                         tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
  934         }
  935 
  936         /*
  937          * SEEK to where we want to be
  938          */
  939         if (cylinder != fd->track) {
  940                 retry_line = __LINE__;
  941                 if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, descyl, 0))
  942                         return (1);
  943                 tsleep(fdc, PRIBIO, "fdseek", hz);
  944                 retry_line = __LINE__;
  945                 if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
  946                         return (1); /* XXX */
  947                 retry_line = __LINE__;
  948                 if ((st0 & 0xc0) || cyl != descyl) {
  949                         need_recal |= (1 << fd->fdsu);
  950                         return (1);
  951                 }
  952                 /* let the heads settle */
  953                 if (settle)
  954                         tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
  955         }
  956         fd->track = cylinder;
  957 
  958         if (debugflags & 8)
  959                 printf("op %x bn %ju siz %u ptr %p retry %d\n",
  960                     bp->bio_cmd, bp->bio_pblkno, fd->fd_iosize,
  961                     fd->fd_ioptr, fdc->retry);
  962 
  963         /* Setup ISADMA if we need it and have it */
  964         if ((bp->bio_cmd == BIO_READ ||
  965                 bp->bio_cmd == BIO_WRITE ||
  966                 bp->bio_cmd == BIO_FMT)
  967              && !(fdc->flags & FDC_NODMA)) {
  968                 isa_dmastart(
  969                     bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
  970                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
  971                 mtx_lock(&fdc->fdc_mtx);
  972                 fd->flags |= FD_ISADMA;
  973                 mtx_unlock(&fdc->fdc_mtx);
  974         }
  975 
  976         /* Do PIO if we have to */
  977         if (fdc->flags & FDC_NODMA) {
  978                 if (bp->bio_cmd == BIO_READ ||
  979                     bp->bio_cmd == BIO_WRITE ||
  980                     bp->bio_cmd == BIO_FMT)
  981                         fdbcdr_wr(fdc, 1, fd->fd_iosize);
  982                 if (bp->bio_cmd == BIO_WRITE ||
  983                     bp->bio_cmd == BIO_FMT)
  984                         fdc_pio(fdc);
  985         }
  986 
  987         switch(bp->bio_cmd) {
  988         case BIO_FMT:
  989                 /* formatting */
  990                 finfo = (struct fd_formb *)bp->bio_data;
  991                 retry_line = __LINE__;
  992                 if (fdc_cmd(fdc, 6,
  993                     NE7CMD_FORMAT | mfm,
  994                     head << 2 | fd->fdsu,
  995                     finfo->fd_formb_secshift,
  996                     finfo->fd_formb_nsecs,
  997                     finfo->fd_formb_gaplen,
  998                     finfo->fd_formb_fillbyte, 0))
  999                         return (1);
 1000                 break;
 1001         case BIO_RDID:
 1002                 retry_line = __LINE__;
 1003                 if (fdc_cmd(fdc, 2,
 1004                     NE7CMD_READID | mfm,
 1005                     head << 2 | fd->fdsu, 0))
 1006                         return (1);
 1007                 break;
 1008         case BIO_READ:
 1009                 retry_line = __LINE__;
 1010                 if (fdc_cmd(fdc, 9,
 1011                     NE7CMD_READ | NE7CMD_SK | mfm | NE7CMD_MT,
 1012                     head << 2 | fd->fdsu,       /* head & unit */
 1013                     fd->track,                  /* track */
 1014                     head,                       /* head */
 1015                     sec,                        /* sector + 1 */
 1016                     fd->ft->secsize,            /* sector size */
 1017                     fd->ft->sectrac,            /* sectors/track */
 1018                     fd->ft->gap,                /* gap size */
 1019                     fd->ft->datalen,            /* data length */
 1020                     0))
 1021                         return (1);
 1022                 break;
 1023         case BIO_WRITE:
 1024                 retry_line = __LINE__;
 1025                 if (fdc_cmd(fdc, 9,
 1026                     NE7CMD_WRITE | mfm | NE7CMD_MT,
 1027                     head << 2 | fd->fdsu,       /* head & unit */
 1028                     fd->track,                  /* track */
 1029                     head,                       /* head */
 1030                     sec,                        /* sector + 1 */
 1031                     fd->ft->secsize,            /* sector size */
 1032                     fd->ft->sectrac,            /* sectors/track */
 1033                     fd->ft->gap,                /* gap size */
 1034                     fd->ft->datalen,            /* data length */
 1035                     0))
 1036                         return (1);
 1037                 break;
 1038         default:
 1039                 KASSERT(0 == 1, ("Wrong bio_cmd %x\n", bp->bio_cmd));
 1040         }
 1041 
 1042         /* Wait for interrupt */
 1043         i = tsleep(fdc, PRIBIO, "fddata", hz);
 1044 
 1045         /* PIO if the read looks good */
 1046         if (i == 0 && (fdc->flags & FDC_NODMA) && (bp->bio_cmd == BIO_READ))
 1047                 fdc_pio(fdc);
 1048 
 1049         /* Finish DMA */
 1050         if (fd->flags & FD_ISADMA) {
 1051                 isa_dmadone(
 1052                     bp->bio_cmd == BIO_READ ? ISADMA_READ : ISADMA_WRITE,
 1053                     fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
 1054                 mtx_lock(&fdc->fdc_mtx);
 1055                 fd->flags &= ~FD_ISADMA;
 1056                 mtx_unlock(&fdc->fdc_mtx);
 1057         }
 1058 
 1059         if (i != 0) {
 1060                 /*
 1061                  * Timeout.
 1062                  *
 1063                  * Due to IBM's brain-dead design, the FDC has a faked ready
 1064                  * signal, hardwired to ready == true. Thus, any command
 1065                  * issued if there's no diskette in the drive will _never_
 1066                  * complete, and must be aborted by resetting the FDC.
 1067                  * Many thanks, Big Blue!
 1068                  */
 1069                 retry_line = __LINE__;
 1070                 fdc->flags |= FDC_NEEDS_RESET;
 1071                 return (1);
 1072         }
 1073 
 1074         retry_line = __LINE__;
 1075         if (fdc_read_status(fdc))
 1076                 return (1);
 1077 
 1078         if (debugflags & 0x10)
 1079                 printf("  -> %x %x %x %x\n",
 1080                     fdc->status[0], fdc->status[1],
 1081                     fdc->status[2], fdc->status[3]);
 1082 
 1083         st0 = fdc->status[0] & NE7_ST0_IC;
 1084         if (st0 != 0) {
 1085                 retry_line = __LINE__;
 1086                 if (st0 == NE7_ST0_IC_AT && fdc->status[1] & NE7_ST1_OR) {
 1087                         /*
 1088                          * DMA overrun. Someone hogged the bus and
 1089                          * didn't release it in time for the next
 1090                          * FDC transfer.
 1091                          */
 1092                         return (1);
 1093                 }
 1094                 retry_line = __LINE__;
 1095                 if(st0 == NE7_ST0_IC_IV) {
 1096                         fdc->flags |= FDC_NEEDS_RESET;
 1097                         return (1);
 1098                 }
 1099                 retry_line = __LINE__;
 1100                 if(st0 == NE7_ST0_IC_AT && fdc->status[2] & NE7_ST2_WC) {
 1101                         need_recal |= (1 << fd->fdsu);
 1102                         return (1);
 1103                 }
 1104                 if (debugflags & 0x20) {
 1105                         printf("status %02x %02x %02x %02x %02x %02x\n",
 1106                             fdc->status[0], fdc->status[1], fdc->status[2],
 1107                             fdc->status[3], fdc->status[4], fdc->status[5]);
 1108                 }
 1109                 retry_line = __LINE__;
 1110                 if (fd->options & FDOPT_NOERROR)
 1111                         override_error = 1;
 1112                 else
 1113                         return (1);
 1114         }
 1115         /* All OK */
 1116         switch(bp->bio_cmd) {
 1117         case BIO_RDID:
 1118                 /* copy out ID field contents */
 1119                 idp = (struct fdc_readid *)bp->bio_data;
 1120                 idp->cyl = fdc->status[3];
 1121                 idp->head = fdc->status[4];
 1122                 idp->sec = fdc->status[5];
 1123                 idp->secshift = fdc->status[6];
 1124                 if (debugflags & 0x40)
 1125                         printf("c %d h %d s %d z %d\n",
 1126                             idp->cyl, idp->head, idp->sec, idp->secshift);
 1127                 break;
 1128         case BIO_READ:
 1129         case BIO_WRITE:
 1130                 bp->bio_pblkno += nsect;
 1131                 bp->bio_resid -= fd->fd_iosize;
 1132                 bp->bio_completed += fd->fd_iosize;
 1133                 fd->fd_ioptr += fd->fd_iosize;
 1134                 if (override_error) {
 1135                         if ((debugflags & 4))
 1136                                 printf("FDOPT_NOERROR: returning bad data\n");
 1137                 } else {
 1138                         /* Since we managed to get something done,
 1139                          * reset the retry */
 1140                         fdc->retry = 0;
 1141                         if (bp->bio_resid > 0)
 1142                                 return (0);
 1143                 }
 1144                 break;
 1145         case BIO_FMT:
 1146                 break;
 1147         }
 1148         return (fdc_biodone(fdc, 0));
 1149 }
 1150 
 1151 static void
 1152 fdc_thread(void *arg)
 1153 {
 1154         struct fdc_data *fdc;
 1155 
 1156         fdc = arg;
 1157         int i;
 1158 
 1159         mtx_lock(&fdc->fdc_mtx);
 1160         fdc->flags |= FDC_KTHREAD_ALIVE;
 1161         while ((fdc->flags & FDC_KTHREAD_EXIT) == 0) {
 1162                 mtx_unlock(&fdc->fdc_mtx);
 1163                 i = fdc_worker(fdc);
 1164                 if (i && debugflags & 0x20) {
 1165                         if (fdc->bp != NULL)
 1166                                 g_print_bio("", fdc->bp, "");
 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 
 1186         fdc = fd->fdc;
 1187         mtx_lock(&fdc->fdc_mtx);
 1188         /* If we go from idle, cancel motor turnoff */
 1189         if (fd->fd_iocount++ == 0)
 1190                 callout_stop(&fd->toffhandle);
 1191         if (fd->flags & FD_MOTOR) {
 1192                 /* The motor is on, send it directly to the controller */
 1193                 bioq_disksort(&fdc->head, bp);
 1194                 wakeup(&fdc->head);
 1195         } else {
 1196                 /* Queue it on the drive until the motor has started */
 1197                 bioq_insert_tail(&fd->fd_bq, bp);
 1198                 if (!(fd->flags & FD_MOTORWAIT))
 1199                         fd_motor(fd, 1);
 1200         }
 1201         mtx_unlock(&fdc->fdc_mtx);
 1202 }
 1203 
 1204 /*
 1205  * Try to find out if we have a disk in the drive.
 1206  */
 1207 static int
 1208 fd_probe_disk(struct fd_data *fd, int *recal)
 1209 {
 1210         struct fdc_data *fdc;
 1211         int st0, st3, cyl;
 1212         int oopts, ret;
 1213 
 1214         fdc = fd->fdc;
 1215         oopts = fd->options;
 1216         fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
 1217         ret = 1;
 1218 
 1219         /*
 1220          * First recal, then seek to cyl#1, this clears the old condition on
 1221          * the disk change line so we can examine it for current status.
 1222          */
 1223         if (debugflags & 0x40)
 1224                 printf("New disk in probe\n");
 1225         mtx_lock(&fdc->fdc_mtx);
 1226         fd->flags |= FD_NEWDISK;
 1227         mtx_unlock(&fdc->fdc_mtx);
 1228         if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
 1229                 goto done;
 1230         tsleep(fdc, PRIBIO, "fdrecal", hz);
 1231         if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
 1232                 goto done;      /* XXX */
 1233         if ((st0 & 0xc0) || cyl != 0)
 1234                 goto done;
 1235 
 1236         /* Seek to track 1 */
 1237         if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, 1, 0))
 1238                 goto done;
 1239         tsleep(fdc, PRIBIO, "fdseek", hz);
 1240         if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
 1241                 goto done;      /* XXX */
 1242         *recal |= (1 << fd->fdsu);
 1243         if (fdin_rd(fdc) & FDI_DCHG) {
 1244                 if (debugflags & 0x40)
 1245                         printf("Empty in probe\n");
 1246                 mtx_lock(&fdc->fdc_mtx);
 1247                 fd->flags |= FD_EMPTY;
 1248                 mtx_unlock(&fdc->fdc_mtx);
 1249         } else {
 1250                 if (fdc_sense_drive(fdc, &st3) != 0)
 1251                         goto done;
 1252                 if (debugflags & 0x40)
 1253                         printf("Got disk in probe\n");
 1254                 mtx_lock(&fdc->fdc_mtx);
 1255                 fd->flags &= ~FD_EMPTY;
 1256                 if (st3 & NE7_ST3_WP)
 1257                         fd->flags |= FD_WP;
 1258                 else
 1259                         fd->flags &= ~FD_WP;
 1260                 mtx_unlock(&fdc->fdc_mtx);
 1261         }
 1262         ret = 0;
 1263 
 1264 done:
 1265         fd->options = oopts;
 1266         return (ret);
 1267 }
 1268 
 1269 static int
 1270 fdmisccmd(struct fd_data *fd, u_int cmd, void *data)
 1271 {
 1272         struct bio *bp;
 1273         struct fd_formb *finfo;
 1274         struct fdc_readid *idfield;
 1275         int error;
 1276 
 1277         bp = malloc(sizeof(struct bio), M_TEMP, M_WAITOK | M_ZERO);
 1278 
 1279         /*
 1280          * Set up a bio request for fdstrategy().  bio_offset is faked
 1281          * so that fdstrategy() will seek to the requested
 1282          * cylinder, and use the desired head.
 1283          */
 1284         bp->bio_cmd = cmd;
 1285         if (cmd == BIO_FMT) {
 1286                 finfo = (struct fd_formb *)data;
 1287                 bp->bio_pblkno =
 1288                     (finfo->cyl * fd->ft->heads + finfo->head) *
 1289                     fd->ft->sectrac;
 1290                 bp->bio_length = sizeof *finfo;
 1291         } else if (cmd == BIO_RDID) {
 1292                 idfield = (struct fdc_readid *)data;
 1293                 bp->bio_pblkno =
 1294                     (idfield->cyl * fd->ft->heads + idfield->head) *
 1295                     fd->ft->sectrac;
 1296                 bp->bio_length = sizeof(struct fdc_readid);
 1297         } else if (cmd == BIO_PROBE) {
 1298                 /* nothing */
 1299         } else
 1300                 panic("wrong cmd in fdmisccmd()");
 1301         bp->bio_offset = bp->bio_pblkno * fd->sectorsize;
 1302         bp->bio_data = data;
 1303         bp->bio_driver1 = fd;
 1304         bp->bio_flags = 0;
 1305 
 1306         fd_enqueue(fd, bp);
 1307 
 1308         do {
 1309                 tsleep(bp, PRIBIO, "fdwait", hz);
 1310         } while (!(bp->bio_flags & BIO_DONE));
 1311         error = bp->bio_error;
 1312 
 1313         free(bp, M_TEMP);
 1314         return (error);
 1315 }
 1316 
 1317 /*
 1318  * Try figuring out the density of the media present in our device.
 1319  */
 1320 static int
 1321 fdautoselect(struct fd_data *fd)
 1322 {
 1323         struct fd_type *fdtp;
 1324         struct fdc_readid id;
 1325         int oopts, rv;
 1326 
 1327         if (!(fd->ft->flags & FL_AUTO))
 1328                 return (0);
 1329 
 1330         fdtp = fd_native_types[fd->type];
 1331         fdsettype(fd, fdtp);
 1332         if (!(fd->ft->flags & FL_AUTO))
 1333                 return (0);
 1334 
 1335         /*
 1336          * Try reading sector ID fields, first at cylinder 0, head 0,
 1337          * then at cylinder 2, head N.  We don't probe cylinder 1,
 1338          * since for 5.25in DD media in a HD drive, there are no data
 1339          * to read (2 step pulses per media cylinder required).  For
 1340          * two-sided media, the second probe always goes to head 1, so
 1341          * we can tell them apart from single-sided media.  As a
 1342          * side-effect this means that single-sided media should be
 1343          * mentioned in the search list after two-sided media of an
 1344          * otherwise identical density.  Media with a different number
 1345          * of sectors per track but otherwise identical parameters
 1346          * cannot be distinguished at all.
 1347          *
 1348          * If we successfully read an ID field on both cylinders where
 1349          * the recorded values match our expectation, we are done.
 1350          * Otherwise, we try the next density entry from the table.
 1351          *
 1352          * Stepping to cylinder 2 has the side-effect of clearing the
 1353          * unit attention bit.
 1354          */
 1355         oopts = fd->options;
 1356         fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
 1357         for (; fdtp->heads; fdtp++) {
 1358                 fdsettype(fd, fdtp);
 1359 
 1360                 id.cyl = id.head = 0;
 1361                 rv = fdmisccmd(fd, BIO_RDID, &id);
 1362                 if (rv != 0)
 1363                         continue;
 1364                 if (id.cyl != 0 || id.head != 0 || id.secshift != fdtp->secsize)
 1365                         continue;
 1366                 id.cyl = 2;
 1367                 id.head = fd->ft->heads - 1;
 1368                 rv = fdmisccmd(fd, BIO_RDID, &id);
 1369                 if (id.cyl != 2 || id.head != fdtp->heads - 1 ||
 1370                     id.secshift != fdtp->secsize)
 1371                         continue;
 1372                 if (rv == 0)
 1373                         break;
 1374         }
 1375 
 1376         fd->options = oopts;
 1377         if (fdtp->heads == 0) {
 1378                 if (debugflags & 0x40)
 1379                         device_printf(fd->dev, "autoselection failed\n");
 1380                 fdsettype(fd, fd_native_types[fd->type]);
 1381                 return (-1);
 1382         } else {
 1383                 if (debugflags & 0x40) {
 1384                         device_printf(fd->dev,
 1385                             "autoselected %d KB medium\n",
 1386                             fd->ft->size / 2);
 1387                         fdprinttype(fd->ft);
 1388                 }
 1389                 return (0);
 1390         }
 1391 }
 1392 
 1393 /*
 1394  * GEOM class implementation
 1395  */
 1396 
 1397 static g_access_t       fd_access;
 1398 static g_start_t        fd_start;
 1399 static g_ioctl_t        fd_ioctl;
 1400 static g_provgone_t     fd_providergone;
 1401 
 1402 struct g_class g_fd_class = {
 1403         .name =         "FD",
 1404         .version =      G_VERSION,
 1405         .start =        fd_start,
 1406         .access =       fd_access,
 1407         .ioctl =        fd_ioctl,
 1408         .providergone = fd_providergone,
 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 
 1418         fd = pp->geom->softc;
 1419         fdc = fd->fdc;
 1420 
 1421         /*
 1422          * If our provider is withering, we can only get negative requests
 1423          * and we don't want to even see them
 1424          */
 1425         if (pp->flags & G_PF_WITHER)
 1426                 return (0);
 1427 
 1428         ar = r + pp->acr;
 1429         aw = w + pp->acw;
 1430         ae = e + pp->ace;
 1431 
 1432         if (ar == 0 && aw == 0 && ae == 0) {
 1433                 fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG | FDOPT_NOERROR);
 1434                 return (0);
 1435         }
 1436 
 1437         if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0) {
 1438                 if (fdmisccmd(fd, BIO_PROBE, NULL))
 1439                         return (ENXIO);
 1440                 if (fd->flags & FD_EMPTY)
 1441                         return (ENXIO);
 1442                 if (fd->flags & FD_NEWDISK) {
 1443                         if (fdautoselect(fd) != 0 &&
 1444                             (device_get_flags(fd->dev) & FD_NO_CHLINE)) {
 1445                                 mtx_lock(&fdc->fdc_mtx);
 1446                                 fd->flags |= FD_EMPTY;
 1447                                 mtx_unlock(&fdc->fdc_mtx);
 1448                                 return (ENXIO);
 1449                         }
 1450                         mtx_lock(&fdc->fdc_mtx);
 1451                         fd->flags &= ~FD_NEWDISK;
 1452                         mtx_unlock(&fdc->fdc_mtx);
 1453                 }
 1454         }
 1455 
 1456         if (w > 0 && (fd->flags & FD_WP)) {
 1457                 return (EROFS);
 1458         }
 1459 
 1460         pp->sectorsize = fd->sectorsize;
 1461         pp->stripesize = fd->ft->heads * fd->ft->sectrac * fd->sectorsize;
 1462         pp->mediasize = pp->stripesize * fd->ft->tracks;
 1463         return (0);
 1464 }
 1465 
 1466 static void
 1467 fd_start(struct bio *bp)
 1468 {
 1469         struct fd_data *        fd;
 1470 
 1471         fd = bp->bio_to->geom->softc;
 1472         bp->bio_driver1 = fd;
 1473         if (bp->bio_cmd == BIO_GETATTR) {
 1474                 if (g_handleattr_int(bp, "GEOM::fwsectors", fd->ft->sectrac))
 1475                         return;
 1476                 if (g_handleattr_int(bp, "GEOM::fwheads", fd->ft->heads))
 1477                         return;
 1478                 g_io_deliver(bp, ENOIOCTL);
 1479                 return;
 1480         }
 1481         if (!(bp->bio_cmd == BIO_READ || bp->bio_cmd == BIO_WRITE)) {
 1482                 g_io_deliver(bp, EOPNOTSUPP);
 1483                 return;
 1484         }
 1485         bp->bio_pblkno = bp->bio_offset / fd->sectorsize;
 1486         bp->bio_resid = bp->bio_length;
 1487         fd_enqueue(fd, bp);
 1488         return;
 1489 }
 1490 
 1491 static int
 1492 fd_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
 1493 {
 1494         struct fd_data *fd;
 1495         struct fdc_status *fsp;
 1496         struct fdc_readid *rid;
 1497         int error;
 1498 
 1499         fd = pp->geom->softc;
 1500 
 1501         switch (cmd) {
 1502         case FD_GTYPE:                  /* get drive type */
 1503                 *(struct fd_type *)data = *fd->ft;
 1504                 return (0);
 1505 
 1506         case FD_STYPE:                  /* set drive type */
 1507                 /*
 1508                  * Allow setting drive type temporarily iff
 1509                  * currently unset.  Used for fdformat so any
 1510                  * user can set it, and then start formatting.
 1511                  */
 1512                 fd->fts = *(struct fd_type *)data;
 1513                 if (fd->fts.sectrac) {
 1514                         /* XXX: check for rubbish */
 1515                         fdsettype(fd, &fd->fts);
 1516                 } else {
 1517                         fdsettype(fd, fd_native_types[fd->type]);
 1518                 }
 1519                 if (debugflags & 0x40)
 1520                         fdprinttype(fd->ft);
 1521                 return (0);
 1522 
 1523         case FD_GOPTS:                  /* get drive options */
 1524                 *(int *)data = fd->options;
 1525                 return (0);
 1526 
 1527         case FD_SOPTS:                  /* set drive options */
 1528                 fd->options = *(int *)data;
 1529                 return (0);
 1530 
 1531         case FD_CLRERR:
 1532                 error = priv_check(td, PRIV_DRIVER);
 1533                 if (error)
 1534                         return (error);
 1535                 fd->fdc->fdc_errs = 0;
 1536                 return (0);
 1537 
 1538         case FD_GSTAT:
 1539                 fsp = (struct fdc_status *)data;
 1540                 if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
 1541                         return (EINVAL);
 1542                 memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
 1543                 return (0);
 1544 
 1545         case FD_GDTYPE:
 1546                 *(enum fd_drivetype *)data = fd->type;
 1547                 return (0);
 1548 
 1549         case FD_FORM:
 1550                 if (!(fflag & FWRITE))
 1551                         return (EPERM);
 1552                 if (((struct fd_formb *)data)->format_version !=
 1553                     FD_FORMAT_VERSION)
 1554                         return (EINVAL); /* wrong version of formatting prog */
 1555                 error = fdmisccmd(fd, BIO_FMT, data);
 1556                 mtx_lock(&fd->fdc->fdc_mtx);
 1557                 fd->flags |= FD_NEWDISK;
 1558                 mtx_unlock(&fd->fdc->fdc_mtx);
 1559                 break;
 1560 
 1561         case FD_READID:
 1562                 rid = (struct fdc_readid *)data;
 1563                 if (rid->cyl > 85 || rid->head > 1)
 1564                         return (EINVAL);
 1565                 error = fdmisccmd(fd, BIO_RDID, data);
 1566                 break;
 1567 
 1568         case FIONBIO:
 1569         case FIOASYNC:
 1570                 /* For backwards compat with old fd*(8) tools */
 1571                 error = 0;
 1572                 break;
 1573 
 1574         default:
 1575                 if (debugflags & 0x80)
 1576                         printf("Unknown ioctl %lx\n", cmd);
 1577                 error = ENOIOCTL;
 1578                 break;
 1579         }
 1580         return (error);
 1581 };
 1582 
 1583 /*
 1584  * Configuration/initialization stuff, per controller.
 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, NE7_SPEC_1(6, 240),
 1688             NE7_SPEC_2(31, 0), 0))
 1689                 return (ENXIO);
 1690 
 1691         /*
 1692          * Try to identify the chip.
 1693          *
 1694          * The i8272 datasheet documents that unknown commands
 1695          * will return ST0 as 0x80.  The i8272 is supposedly identical
 1696          * to the NEC765.
 1697          * The i82077SL datasheet says 0x90 for the VERSION command,
 1698          * and several "superio" chips emulate this.
 1699          */
 1700         if (fdc_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type))
 1701                 return (ENXIO);
 1702         if (fdc_cmd(fdc, 1, 0x18, 1, &part_id))
 1703                 return (ENXIO);
 1704         if (bootverbose)
 1705                 device_printf(dev,
 1706                     "ic_type %02x part_id %02x\n", ic_type, part_id);
 1707         switch (ic_type & 0xff) {
 1708         case 0x80:
 1709                 device_set_desc(dev, "NEC 765 or clone");
 1710                 fdc->fdct = FDC_NE765;
 1711                 break;
 1712         case 0x81:
 1713         case 0x90:
 1714                 device_set_desc(dev,
 1715                     "Enhanced floppy controller");
 1716                 fdc->fdct = FDC_ENHANCED;
 1717                 break;
 1718         default:
 1719                 device_set_desc(dev, "Generic floppy controller");
 1720                 fdc->fdct = FDC_UNKNOWN;
 1721                 break;
 1722         }
 1723         return (0);
 1724 }
 1725 
 1726 int
 1727 fdc_detach(device_t dev)
 1728 {
 1729         struct  fdc_data *fdc;
 1730         int     error;
 1731 
 1732         fdc = device_get_softc(dev);
 1733 
 1734         /* have our children detached first */
 1735         if ((error = bus_generic_detach(dev)))
 1736                 return (error);
 1737 
 1738         if (fdc->fdc_intr)
 1739                 bus_teardown_intr(dev, fdc->res_irq, fdc->fdc_intr);
 1740         fdc->fdc_intr = NULL;
 1741 
 1742         /* kill worker thread */
 1743         mtx_lock(&fdc->fdc_mtx);
 1744         fdc->flags |= FDC_KTHREAD_EXIT;
 1745         wakeup(&fdc->head);
 1746         while ((fdc->flags & FDC_KTHREAD_ALIVE) != 0)
 1747                 msleep(fdc->fdc_thread, &fdc->fdc_mtx, PRIBIO, "fdcdet", 0);
 1748         mtx_unlock(&fdc->fdc_mtx);
 1749 
 1750         /* reset controller, turn motor off */
 1751         fdout_wr(fdc, 0);
 1752 
 1753         if (!(fdc->flags & FDC_NODMA))
 1754                 isa_dma_release(fdc->dmachan);
 1755         fdc_release_resources(fdc);
 1756         mtx_destroy(&fdc->fdc_mtx);
 1757         return (0);
 1758 }
 1759 
 1760 /*
 1761  * Add a child device to the fdc controller.  It will then be probed etc.
 1762  */
 1763 device_t
 1764 fdc_add_child(device_t dev, const char *name, int unit)
 1765 {
 1766         struct fdc_ivars *ivar;
 1767         device_t child;
 1768 
 1769         ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_NOWAIT | M_ZERO);
 1770         if (ivar == NULL)
 1771                 return (NULL);
 1772         child = device_add_child(dev, name, unit);
 1773         if (child == NULL) {
 1774                 free(ivar, M_DEVBUF);
 1775                 return (NULL);
 1776         }
 1777         device_set_ivars(child, ivar);
 1778         ivar->fdunit = unit;
 1779         ivar->fdtype = FDT_NONE;
 1780         if (resource_disabled(name, unit))
 1781                 device_disable(child);
 1782         return (child);
 1783 }
 1784 
 1785 int
 1786 fdc_attach(device_t dev)
 1787 {
 1788         struct  fdc_data *fdc;
 1789         int     error;
 1790 
 1791         fdc = device_get_softc(dev);
 1792         fdc->fdc_dev = dev;
 1793         error = fdc_initial_reset(dev, fdc);
 1794         if (error) {
 1795                 device_printf(dev, "does not respond\n");
 1796                 return (error);
 1797         }
 1798         error = bus_setup_intr(dev, fdc->res_irq,
 1799             INTR_TYPE_BIO | INTR_ENTROPY | 
 1800             ((fdc->flags & FDC_NOFAST) ? INTR_MPSAFE : 0),                     
 1801             ((fdc->flags & FDC_NOFAST) ? NULL : fdc_intr_fast),             
 1802             ((fdc->flags & FDC_NOFAST) ? fdc_intr : NULL), 
 1803                                fdc, &fdc->fdc_intr);
 1804         if (error) {
 1805                 device_printf(dev, "cannot setup interrupt\n");
 1806                 return (error);
 1807         }
 1808         if (!(fdc->flags & FDC_NODMA)) {
 1809                 error = isa_dma_acquire(fdc->dmachan);
 1810                 if (!error) {
 1811                         error = isa_dma_init(fdc->dmachan,
 1812                             MAX_BYTES_PER_CYL, M_WAITOK);
 1813                         if (error)
 1814                                 isa_dma_release(fdc->dmachan);
 1815                 }
 1816                 if (error)
 1817                         return (error);
 1818         }
 1819         fdc->fdcu = device_get_unit(dev);
 1820         fdc->flags |= FDC_NEEDS_RESET;
 1821 
 1822         mtx_init(&fdc->fdc_mtx, "fdc lock", NULL, MTX_DEF);
 1823 
 1824         /* reset controller, turn motor off, clear fdout mirror reg */
 1825         fdout_wr(fdc, fdc->fdout = 0);
 1826         bioq_init(&fdc->head);
 1827 
 1828         settle = hz / 8;
 1829 
 1830         return (0);
 1831 }
 1832 
 1833 void
 1834 fdc_start_worker(device_t dev)
 1835 {
 1836         struct  fdc_data *fdc;
 1837 
 1838         fdc = device_get_softc(dev);
 1839         kproc_create(fdc_thread, fdc, &fdc->fdc_thread, 0, 0,
 1840             "fdc%d", device_get_unit(dev));
 1841 }
 1842 
 1843 int
 1844 fdc_hints_probe(device_t dev)
 1845 {
 1846         const char *name, *dname;
 1847         int i, error, dunit;
 1848 
 1849         /*
 1850          * Probe and attach any children.  We should probably detect
 1851          * devices from the BIOS unless overridden.
 1852          */
 1853         name = device_get_nameunit(dev);
 1854         i = 0;
 1855         while ((resource_find_match(&i, &dname, &dunit, "at", name)) == 0) {
 1856                 resource_int_value(dname, dunit, "drive", &dunit);
 1857                 fdc_add_child(dev, dname, dunit);
 1858         }
 1859 
 1860         if ((error = bus_generic_attach(dev)) != 0)
 1861                 return (error);
 1862         return (0);
 1863 }
 1864 
 1865 int
 1866 fdc_print_child(device_t me, device_t child)
 1867 {
 1868         int retval = 0, flags;
 1869 
 1870         retval += bus_print_child_header(me, child);
 1871         retval += printf(" on %s drive %d", device_get_nameunit(me),
 1872                fdc_get_fdunit(child));
 1873         if ((flags = device_get_flags(me)) != 0)
 1874                 retval += printf(" flags %#x", flags);
 1875         retval += printf("\n");
 1876 
 1877         return (retval);
 1878 }
 1879 
 1880 /*
 1881  * Configuration/initialization, per drive.
 1882  */
 1883 static int
 1884 fd_probe(device_t dev)
 1885 {
 1886 #if defined(__i386__) || defined(__amd64__)
 1887         int     unit;
 1888 #endif
 1889         int     i;
 1890         u_int   st0, st3;
 1891         struct  fd_data *fd;
 1892         struct  fdc_data *fdc;
 1893         int     fdsu;
 1894         int     flags, type;
 1895 
 1896         fdsu = fdc_get_fdunit(dev);
 1897         fd = device_get_softc(dev);
 1898         fdc = device_get_softc(device_get_parent(dev));
 1899         flags = device_get_flags(dev);
 1900 
 1901         fd->dev = dev;
 1902         fd->fdc = fdc;
 1903         fd->fdsu = fdsu;
 1904 
 1905         /* Auto-probe if fdinfo is present, but always allow override. */
 1906         type = flags & FD_TYPEMASK;
 1907         if (type == FDT_NONE && (type = fdc_get_fdtype(dev)) != FDT_NONE) {
 1908                 fd->type = type;
 1909                 goto done;
 1910         } else {
 1911                 /* make sure fdautoselect() will be called */
 1912                 fd->flags = FD_EMPTY;
 1913                 fd->type = type;
 1914         }
 1915 
 1916 #if defined(__i386__) || defined(__amd64__)
 1917         unit = device_get_unit(dev);
 1918         if (fd->type == FDT_NONE && (unit == 0 || unit == 1)) {
 1919                 /* Look up what the BIOS thinks we have. */
 1920                 if (unit == 0)
 1921                         fd->type = (rtcin(RTC_FDISKETTE) & 0xf0) >> 4;
 1922                 else
 1923                         fd->type = rtcin(RTC_FDISKETTE) & 0x0f;
 1924                 if (fd->type == FDT_288M_1)
 1925                         fd->type = FDT_288M;
 1926         }
 1927 #endif /* __i386__ || __amd64__ */
 1928         /* is there a unit? */
 1929         if (fd->type == FDT_NONE)
 1930                 return (ENXIO);
 1931 
 1932         mtx_lock(&fdc->fdc_mtx);
 1933 
 1934         /* select it */
 1935         fd_select(fd);
 1936         fd_motor(fd, 1);
 1937         fdc->fd = fd;
 1938         fdc_reset(fdc);         /* XXX reset, then unreset, etc. */
 1939         DELAY(1000000); /* 1 sec */
 1940 
 1941         if ((flags & FD_NO_PROBE) == 0) {
 1942                 /* If we're at track 0 first seek inwards. */
 1943                 if ((fdc_sense_drive(fdc, &st3) == 0) &&
 1944                     (st3 & NE7_ST3_T0)) {
 1945                         /* Seek some steps... */
 1946                         if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
 1947                                 /* ...wait a moment... */
 1948                                 DELAY(300000);
 1949                                 /* make ctrlr happy: */
 1950                                 fdc_sense_int(fdc, NULL, NULL);
 1951                         }
 1952                 }
 1953 
 1954                 for (i = 0; i < 2; i++) {
 1955                         /*
 1956                          * we must recalibrate twice, just in case the
 1957                          * heads have been beyond cylinder 76, since
 1958                          * most FDCs still barf when attempting to
 1959                          * recalibrate more than 77 steps
 1960                          */
 1961                         /* go back to 0: */
 1962                         if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
 1963                                 /* a second being enough for full stroke seek*/
 1964                                 DELAY(i == 0 ? 1000000 : 300000);
 1965 
 1966                                 /* anything responding? */
 1967                                 if (fdc_sense_int(fdc, &st0, NULL) == 0 &&
 1968                                     (st0 & NE7_ST0_EC) == 0)
 1969                                         break; /* already probed successfully */
 1970                         }
 1971                 }
 1972         }
 1973 
 1974         fd_motor(fd, 0);
 1975         fdc->fd = NULL;
 1976         mtx_unlock(&fdc->fdc_mtx);
 1977 
 1978         if ((flags & FD_NO_PROBE) == 0 &&
 1979             (st0 & NE7_ST0_EC) != 0) /* no track 0 -> no drive present */
 1980                 return (ENXIO);
 1981 
 1982 done:
 1983 
 1984         switch (fd->type) {
 1985         case FDT_12M:
 1986                 device_set_desc(dev, "1200-KB 5.25\" drive");
 1987                 break;
 1988         case FDT_144M:
 1989                 device_set_desc(dev, "1440-KB 3.5\" drive");
 1990                 break;
 1991         case FDT_288M:
 1992                 device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
 1993                 break;
 1994         case FDT_360K:
 1995                 device_set_desc(dev, "360-KB 5.25\" drive");
 1996                 break;
 1997         case FDT_720K:
 1998                 device_set_desc(dev, "720-KB 3.5\" drive");
 1999                 break;
 2000         default:
 2001                 return (ENXIO);
 2002         }
 2003         fd->track = FD_NO_TRACK;
 2004         fd->fdc = fdc;
 2005         fd->fdsu = fdsu;
 2006         fd->options = 0;
 2007         callout_init_mtx(&fd->toffhandle, &fd->fdc->fdc_mtx, 0);
 2008 
 2009         /* initialize densities for subdevices */
 2010         fdsettype(fd, fd_native_types[fd->type]);
 2011         return (0);
 2012 }
 2013 
 2014 /*
 2015  * We have to do this in a geom event because GEOM is not running
 2016  * when fd_attach() is.
 2017  * XXX: move fd_attach after geom like ata/scsi disks
 2018  */
 2019 static void
 2020 fd_attach2(void *arg, int flag)
 2021 {
 2022         struct  fd_data *fd;
 2023 
 2024         fd = arg;
 2025 
 2026         fd->fd_geom = g_new_geomf(&g_fd_class,
 2027             "fd%d", device_get_unit(fd->dev));
 2028         fd->fd_provider = g_new_providerf(fd->fd_geom, "%s", fd->fd_geom->name);
 2029         fd->fd_geom->softc = fd;
 2030         g_error_provider(fd->fd_provider, 0);
 2031 }
 2032 
 2033 static int
 2034 fd_attach(device_t dev)
 2035 {
 2036         struct  fd_data *fd;
 2037 
 2038         fd = device_get_softc(dev);
 2039         g_post_event(fd_attach2, fd, M_WAITOK, NULL);
 2040         fd->flags |= FD_EMPTY;
 2041         bioq_init(&fd->fd_bq);
 2042 
 2043         return (0);
 2044 }
 2045 
 2046 static void
 2047 fd_providergone(struct g_provider *pp)
 2048 {
 2049         struct fd_data *fd;
 2050 
 2051         fd = pp->geom->softc;
 2052         fd->gone = true;
 2053         wakeup(fd);
 2054 }
 2055 
 2056 static void
 2057 fd_detach_geom(void *arg, int flag)
 2058 {
 2059         struct  fd_data *fd = arg;
 2060 
 2061         g_topology_assert();
 2062         g_wither_geom(fd->fd_geom, ENXIO);
 2063 }
 2064 
 2065 static int
 2066 fd_detach(device_t dev)
 2067 {
 2068         struct  fd_data *fd;
 2069 
 2070         fd = device_get_softc(dev);
 2071 
 2072         g_waitfor_event(fd_detach_geom, fd, M_WAITOK, NULL);
 2073         while (!fd->gone) {
 2074                 tsleep(fd, PZERO, "fdgone", hz/10);
 2075         }
 2076 
 2077         /*
 2078          * There may be accesses to the floppy while we're waitng, so drain the
 2079          * motor callback here. fdc_detach turns off motor if it's still on when
 2080          * we get to this point.
 2081          */
 2082         callout_drain(&fd->toffhandle);
 2083 
 2084         return (0);
 2085 }
 2086 
 2087 static device_method_t fd_methods[] = {
 2088         /* Device interface */
 2089         DEVMETHOD(device_probe,         fd_probe),
 2090         DEVMETHOD(device_attach,        fd_attach),
 2091         DEVMETHOD(device_detach,        fd_detach),
 2092         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
 2093         DEVMETHOD(device_suspend,       bus_generic_suspend), /* XXX */
 2094         DEVMETHOD(device_resume,        bus_generic_resume), /* XXX */
 2095         { 0, 0 }
 2096 };
 2097 
 2098 static driver_t fd_driver = {
 2099         "fd",
 2100         fd_methods,
 2101         sizeof(struct fd_data)
 2102 };
 2103 
 2104 static int
 2105 fdc_modevent(module_t mod, int type, void *data)
 2106 {
 2107 
 2108         return (g_modevent(NULL, type, &g_fd_class));
 2109 }
 2110 
 2111 DRIVER_MODULE(fd, fdc, fd_driver, fdc_modevent, 0);

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