Device layer rollup commit.
[dragonfly.git] / sys / dev / disk / fd / fd.c
1 /*
2  * Copyright (c) 1990 The Regents of the University of California.
3  * All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Don Ahn.
7  *
8  * Libretto PCMCIA floppy support by David Horwitt (dhorwitt@ucsd.edu)
9  * aided by the Linux floppy driver modifications from David Bateman
10  * (dbateman@eng.uts.edu.au).
11  *
12  * Copyright (c) 1993, 1994 by
13  *  jc@irbs.UUCP (John Capo)
14  *  vak@zebub.msk.su (Serge Vakulenko)
15  *  ache@astral.msk.su (Andrew A. Chernov)
16  *
17  * Copyright (c) 1993, 1994, 1995 by
18  *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
19  *  dufault@hda.com (Peter Dufault)
20  *
21  * Copyright (c) 2001 Joerg Wunsch,
22  *  joerg_wunsch@uriah.sax.de (Joerg Wunsch)
23  *
24  * Redistribution and use in source and binary forms, with or without
25  * modification, are permitted provided that the following conditions
26  * are met:
27  * 1. Redistributions of source code must retain the above copyright
28  *    notice, this list of conditions and the following disclaimer.
29  * 2. Redistributions in binary form must reproduce the above copyright
30  *    notice, this list of conditions and the following disclaimer in the
31  *    documentation and/or other materials provided with the distribution.
32  * 3. All advertising materials mentioning features or use of this software
33  *    must display the following acknowledgement:
34  *      This product includes software developed by the University of
35  *      California, Berkeley and its contributors.
36  * 4. Neither the name of the University nor the names of its contributors
37  *    may be used to endorse or promote products derived from this software
38  *    without specific prior written permission.
39  *
40  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  *      from:   @(#)fd.c        7.4 (Berkeley) 5/25/91
53  * $FreeBSD: src/sys/isa/fd.c,v 1.176.2.8 2002/05/15 21:56:14 joerg Exp $
54  * $DragonFly: src/sys/dev/disk/fd/fd.c,v 1.16 2004/05/19 22:52:41 dillon Exp $
55  *
56  */
57
58 #include "opt_fdc.h"
59 #include "use_pccard.h"
60
61 #include <sys/param.h>
62 #include <sys/systm.h>
63 #include <sys/bootmaj.h>
64 #include <sys/kernel.h>
65 #include <sys/buf.h>
66 #include <sys/bus.h>
67 #include <sys/conf.h>
68 #include <sys/disklabel.h>
69 #include <sys/devicestat.h>
70 #include <sys/fcntl.h>
71 #include <sys/malloc.h>
72 #include <sys/module.h>
73 #include <sys/proc.h>
74 #include <sys/syslog.h>
75 #include <sys/device.h>
76
77 #include <sys/bus.h>
78 #include <machine/bus.h>
79 #include <sys/rman.h>
80
81 #include <sys/buf2.h>
82
83 #include <machine/clock.h>
84 #include <machine/ioctl_fd.h>
85 #include <machine/resource.h>
86 #include <machine/stdarg.h>
87
88 #include <bus/isa/isavar.h>
89 #include <bus/isa/isareg.h>
90 #include "fdreg.h"
91 #include "fdc.h"
92 #include <bus/isa/rtc.h>
93
94 /* misuse a flag to identify format operation */
95 #define B_FORMAT B_XXX
96
97 /* configuration flags */
98 #define FDC_PRETEND_D0  (1 << 0)        /* pretend drive 0 to be there */
99 #define FDC_NO_FIFO     (1 << 2)        /* do not enable FIFO  */
100
101 /* internally used only, not really from CMOS: */
102 #define RTCFDT_144M_PRETENDED   0x1000
103
104 /* error returns for fd_cmd() */
105 #define FD_FAILED -1
106 #define FD_NOT_VALID -2
107 #define FDC_ERRMAX      100     /* do not log more */
108 /*
109  * Stop retrying after this many DMA overruns.  Since each retry takes
110  * one revolution, with 300 rpm., 25 retries take approximately 10
111  * seconds which the read attempt will block in case the DMA overrun
112  * is persistent.
113  */
114 #define FDC_DMAOV_MAX   25
115
116 /*
117  * Timeout value for the PIO loops to wait until the FDC main status
118  * register matches our expectations (request for master, direction
119  * bit).  This is supposed to be a number of microseconds, although
120  * timing might actually not be very accurate.
121  *
122  * Timeouts of 100 msec are believed to be required for some broken
123  * (old) hardware.
124  */
125 #define FDSTS_TIMEOUT   100000
126
127 #define NUMTYPES 17
128 #define NUMDENS  (NUMTYPES - 7)
129
130 /* These defines (-1) must match index for fd_types */
131 #define F_TAPE_TYPE     0x020   /* bit for fd_types to indicate tape */
132 #define NO_TYPE         0       /* must match NO_TYPE in ft.c */
133 #define FD_1720         1
134 #define FD_1480         2
135 #define FD_1440         3
136 #define FD_1200         4
137 #define FD_820          5
138 #define FD_800          6
139 #define FD_720          7
140 #define FD_360          8
141 #define FD_640          9
142 #define FD_1232         10
143
144 #define FD_1480in5_25   11
145 #define FD_1440in5_25   12
146 #define FD_820in5_25    13
147 #define FD_800in5_25    14
148 #define FD_720in5_25    15
149 #define FD_360in5_25    16
150 #define FD_640in5_25    17
151
152
153 static struct fd_type fd_types[NUMTYPES] =
154 {
155 { 21,2,0xFF,0x04,82,3444,1,FDC_500KBPS,2,0x0C,2 }, /* 1.72M in HD 3.5in */
156 { 18,2,0xFF,0x1B,82,2952,1,FDC_500KBPS,2,0x6C,1 }, /* 1.48M in HD 3.5in */
157 { 18,2,0xFF,0x1B,80,2880,1,FDC_500KBPS,2,0x6C,1 }, /* 1.44M in HD 3.5in */
158 { 15,2,0xFF,0x1B,80,2400,1,FDC_500KBPS,2,0x54,1 }, /*  1.2M in HD 5.25/3.5 */
159 { 10,2,0xFF,0x10,82,1640,1,FDC_250KBPS,2,0x2E,1 }, /*  820K in HD 3.5in */
160 { 10,2,0xFF,0x10,80,1600,1,FDC_250KBPS,2,0x2E,1 }, /*  800K in HD 3.5in */
161 {  9,2,0xFF,0x20,80,1440,1,FDC_250KBPS,2,0x50,1 }, /*  720K in HD 3.5in */
162 {  9,2,0xFF,0x2A,40, 720,1,FDC_250KBPS,2,0x50,1 }, /*  360K in DD 5.25in */
163 {  8,2,0xFF,0x2A,80,1280,1,FDC_250KBPS,2,0x50,1 }, /*  640K in DD 5.25in */
164 {  8,3,0xFF,0x35,77,1232,1,FDC_500KBPS,2,0x74,1 }, /* 1.23M in HD 5.25in */
165
166 { 18,2,0xFF,0x02,82,2952,1,FDC_500KBPS,2,0x02,2 }, /* 1.48M in HD 5.25in */
167 { 18,2,0xFF,0x02,80,2880,1,FDC_500KBPS,2,0x02,2 }, /* 1.44M in HD 5.25in */
168 { 10,2,0xFF,0x10,82,1640,1,FDC_300KBPS,2,0x2E,1 }, /*  820K in HD 5.25in */
169 { 10,2,0xFF,0x10,80,1600,1,FDC_300KBPS,2,0x2E,1 }, /*  800K in HD 5.25in */
170 {  9,2,0xFF,0x20,80,1440,1,FDC_300KBPS,2,0x50,1 }, /*  720K in HD 5.25in */
171 {  9,2,0xFF,0x23,40, 720,2,FDC_300KBPS,2,0x50,1 }, /*  360K in HD 5.25in */
172 {  8,2,0xFF,0x2A,80,1280,1,FDC_300KBPS,2,0x50,1 }, /*  640K in HD 5.25in */
173 };
174
175 #define DRVS_PER_CTLR 2         /* 2 floppies */
176
177 /***********************************************************************\
178 * Per controller structure.                                             *
179 \***********************************************************************/
180 devclass_t fdc_devclass;
181
182 /***********************************************************************\
183 * Per drive structure.                                                  *
184 * N per controller  (DRVS_PER_CTLR)                                     *
185 \***********************************************************************/
186 struct fd_data {
187         struct  fdc_data *fdc;  /* pointer to controller structure */
188         int     fdsu;           /* this units number on this controller */
189         int     type;           /* Drive type (FD_1440...) */
190         struct  fd_type *ft;    /* pointer to the type descriptor */
191         int     flags;
192 #define FD_OPEN         0x01    /* it's open            */
193 #define FD_ACTIVE       0x02    /* it's active          */
194 #define FD_MOTOR        0x04    /* motor should be on   */
195 #define FD_MOTOR_WAIT   0x08    /* motor coming up      */
196         int     skip;
197         int     hddrv;
198 #define FD_NO_TRACK -2
199         int     track;          /* where we think the head is */
200         int     options;        /* user configurable options, see ioctl_fd.h */
201         struct  callout_handle toffhandle;
202         struct  callout_handle tohandle;
203         struct  devstat device_stats;
204         device_t dev;
205         fdu_t   fdu;
206 };
207
208 struct fdc_ivars {
209         int     fdunit;
210 };
211 static devclass_t fd_devclass;
212
213 /***********************************************************************\
214 * Throughout this file the following conventions will be used:          *
215 * fd is a pointer to the fd_data struct for the drive in question       *
216 * fdc is a pointer to the fdc_data struct for the controller            *
217 * fdu is the floppy drive unit number                                   *
218 * fdcu is the floppy controller unit number                             *
219 * fdsu is the floppy drive unit number on that controller. (sub-unit)   *
220 \***********************************************************************/
221
222 /* internal functions */
223 static  void fdc_intr(void *);
224 static void set_motor(struct fdc_data *, int, int);
225 #  define TURNON 1
226 #  define TURNOFF 0
227 static timeout_t fd_turnoff;
228 static timeout_t fd_motor_on;
229 static void fd_turnon(struct fd_data *);
230 static void fdc_reset(fdc_p);
231 static int fd_in(struct fdc_data *, int *);
232 static int out_fdc(struct fdc_data *, int);
233 static void fdstart(struct fdc_data *);
234 static timeout_t fd_iotimeout;
235 static timeout_t fd_pseudointr;
236 static int fdstate(struct fdc_data *);
237 static int retrier(struct fdc_data *);
238 static int fdformat(dev_t, struct fd_formb *, struct thread *);
239
240 static int enable_fifo(fdc_p fdc);
241
242 static int fifo_threshold = 8;  /* XXX: should be accessible via sysctl */
243
244
245 #define DEVIDLE         0
246 #define FINDWORK        1
247 #define DOSEEK          2
248 #define SEEKCOMPLETE    3
249 #define IOCOMPLETE      4
250 #define RECALCOMPLETE   5
251 #define STARTRECAL      6
252 #define RESETCTLR       7
253 #define SEEKWAIT        8
254 #define RECALWAIT       9
255 #define MOTORWAIT       10
256 #define IOTIMEDOUT      11
257 #define RESETCOMPLETE   12
258 #define PIOREAD         13
259
260 #ifdef  FDC_DEBUG
261 static char const * const fdstates[] =
262 {
263 "DEVIDLE",
264 "FINDWORK",
265 "DOSEEK",
266 "SEEKCOMPLETE",
267 "IOCOMPLETE",
268 "RECALCOMPLETE",
269 "STARTRECAL",
270 "RESETCTLR",
271 "SEEKWAIT",
272 "RECALWAIT",
273 "MOTORWAIT",
274 "IOTIMEDOUT",
275 "RESETCOMPLETE",
276 "PIOREAD",
277 };
278
279 /* CAUTION: fd_debug causes huge amounts of logging output */
280 static int volatile fd_debug = 0;
281 #define TRACE0(arg) if(fd_debug) printf(arg)
282 #define TRACE1(arg1, arg2) if(fd_debug) printf(arg1, arg2)
283 #else /* FDC_DEBUG */
284 #define TRACE0(arg)
285 #define TRACE1(arg1, arg2)
286 #endif /* FDC_DEBUG */
287
288 void
289 fdout_wr(fdc_p fdc, u_int8_t v)
290 {
291         bus_space_write_1(fdc->portt, fdc->porth, FDOUT+fdc->port_off, v);
292 }
293
294 static u_int8_t
295 fdsts_rd(fdc_p fdc)
296 {
297         return bus_space_read_1(fdc->portt, fdc->porth, FDSTS+fdc->port_off);
298 }
299
300 static void
301 fddata_wr(fdc_p fdc, u_int8_t v)
302 {
303         bus_space_write_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off, v);
304 }
305
306 static u_int8_t
307 fddata_rd(fdc_p fdc)
308 {
309         return bus_space_read_1(fdc->portt, fdc->porth, FDDATA+fdc->port_off);
310 }
311
312 static void
313 fdctl_wr_isa(fdc_p fdc, u_int8_t v)
314 {
315         bus_space_write_1(fdc->ctlt, fdc->ctlh, 0, v);
316 }
317
318 #if 0
319
320 static u_int8_t
321 fdin_rd(fdc_p fdc)
322 {
323         return bus_space_read_1(fdc->portt, fdc->porth, FDIN);
324 }
325
326 #endif
327
328 static  d_open_t        Fdopen; /* NOTE, not fdopen */
329 static  d_close_t       fdclose;
330 static  d_ioctl_t       fdioctl;
331 static  d_strategy_t    fdstrategy;
332
333 static struct cdevsw fd_cdevsw = {
334         /* name */      "fd",
335         /* maj */       FD_CDEV_MAJOR,
336         /* flags */     D_DISK,
337         /* port */      NULL,
338         /* clone */     NULL,
339
340         /* open */      Fdopen,
341         /* close */     fdclose,
342         /* read */      physread,
343         /* write */     physwrite,
344         /* ioctl */     fdioctl,
345         /* poll */      nopoll,
346         /* mmap */      nommap,
347         /* strategy */  fdstrategy,
348         /* dump */      nodump,
349         /* psize */     nopsize
350 };
351
352 static int
353 fdc_err(struct fdc_data *fdc, const char *s)
354 {
355         fdc->fdc_errs++;
356         if (s) {
357                 if (fdc->fdc_errs < FDC_ERRMAX)
358                         device_printf(fdc->fdc_dev, "%s", s);
359                 else if (fdc->fdc_errs == FDC_ERRMAX)
360                         device_printf(fdc->fdc_dev, "too many errors, not "
361                                                     "logging any more\n");
362         }
363
364         return FD_FAILED;
365 }
366
367 /*
368  * fd_cmd: Send a command to the chip.  Takes a varargs with this structure:
369  * Unit number,
370  * # of output bytes, output bytes as ints ...,
371  * # of input bytes, input bytes as ints ...
372  */
373 int
374 fd_cmd(struct fdc_data *fdc, int n_out, ...)
375 {
376         u_char cmd;
377         int n_in;
378         int n;
379         __va_list ap;
380
381         __va_start(ap, n_out);
382         cmd = (u_char)(__va_arg(ap, int));
383         __va_end(ap);
384         __va_start(ap, n_out);
385         for (n = 0; n < n_out; n++)
386         {
387                 if (out_fdc(fdc, __va_arg(ap, int)) < 0)
388                 {
389                         char msg[50];
390                         snprintf(msg, sizeof(msg),
391                                 "cmd %x failed at out byte %d of %d\n",
392                                 cmd, n + 1, n_out);
393                         return fdc_err(fdc, msg);
394                 }
395         }
396         n_in = __va_arg(ap, int);
397         for (n = 0; n < n_in; n++)
398         {
399                 int *ptr = __va_arg(ap, int *);
400                 if (fd_in(fdc, ptr) < 0)
401                 {
402                         char msg[50];
403                         snprintf(msg, sizeof(msg),
404                                 "cmd %02x failed at in byte %d of %d\n",
405                                 cmd, n + 1, n_in);
406                         return fdc_err(fdc, msg);
407                 }
408         }
409
410         return 0;
411 }
412
413 static int 
414 enable_fifo(fdc_p fdc)
415 {
416         int i, j;
417
418         if ((fdc->flags & FDC_HAS_FIFO) == 0) {
419                 
420                 /*
421                  * XXX: 
422                  * Cannot use fd_cmd the normal way here, since
423                  * this might be an invalid command. Thus we send the
424                  * first byte, and check for an early turn of data directon.
425                  */
426                 
427                 if (out_fdc(fdc, I8207X_CONFIGURE) < 0)
428                         return fdc_err(fdc, "Enable FIFO failed\n");
429                 
430                 /* If command is invalid, return */
431                 j = FDSTS_TIMEOUT;
432                 while ((i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM))
433                        != NE7_RQM && j-- > 0) {
434                         if (i == (NE7_DIO | NE7_RQM)) {
435                                 fdc_reset(fdc);
436                                 return FD_FAILED;
437                         }
438                         DELAY(1);
439                 }
440                 if (j<0 || 
441                     fd_cmd(fdc, 3,
442                            0, (fifo_threshold - 1) & 0xf, 0, 0) < 0) {
443                         fdc_reset(fdc);
444                         return fdc_err(fdc, "Enable FIFO failed\n");
445                 }
446                 fdc->flags |= FDC_HAS_FIFO;
447                 return 0;
448         }
449         if (fd_cmd(fdc, 4,
450                    I8207X_CONFIGURE, 0, (fifo_threshold - 1) & 0xf, 0, 0) < 0)
451                 return fdc_err(fdc, "Re-enable FIFO failed\n");
452         return 0;
453 }
454
455 static int
456 fd_sense_drive_status(fdc_p fdc, int *st3p)
457 {
458         int st3;
459
460         if (fd_cmd(fdc, 2, NE7CMD_SENSED, fdc->fdu, 1, &st3))
461         {
462                 return fdc_err(fdc, "Sense Drive Status failed\n");
463         }
464         if (st3p)
465                 *st3p = st3;
466
467         return 0;
468 }
469
470 static int
471 fd_sense_int(fdc_p fdc, int *st0p, int *cylp)
472 {
473         int cyl, st0, ret;
474
475         ret = fd_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
476         if (ret) {
477                 (void)fdc_err(fdc,
478                               "sense intr err reading stat reg 0\n");
479                 return ret;
480         }
481
482         if (st0p)
483                 *st0p = st0;
484
485         if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
486                 /*
487                  * There doesn't seem to have been an interrupt.
488                  */
489                 return FD_NOT_VALID;
490         }
491
492         if (fd_in(fdc, &cyl) < 0) {
493                 return fdc_err(fdc, "can't get cyl num\n");
494         }
495
496         if (cylp)
497                 *cylp = cyl;
498
499         return 0;
500 }
501
502
503 static int
504 fd_read_status(fdc_p fdc, int fdsu)
505 {
506         int i, ret;
507
508         for (i = 0; i < 7; i++) {
509                 /*
510                  * XXX types are poorly chosen.  Only bytes can by read
511                  * from the hardware, but fdc->status[] wants u_ints and
512                  * fd_in() gives ints.
513                  */
514                 int status;
515
516                 ret = fd_in(fdc, &status);
517                 fdc->status[i] = status;
518                 if (ret != 0)
519                         break;
520         }
521
522         if (ret == 0)
523                 fdc->flags |= FDC_STAT_VALID;
524         else
525                 fdc->flags &= ~FDC_STAT_VALID;
526
527         return ret;
528 }
529
530 /****************************************************************************/
531 /*                      autoconfiguration stuff                             */
532 /****************************************************************************/
533
534 int
535 fdc_alloc_resources(struct fdc_data *fdc)
536 {
537         device_t dev;
538         int ispnp, ispcmcia;
539
540         dev = fdc->fdc_dev;
541         ispnp = (fdc->flags & FDC_ISPNP) != 0;
542         ispcmcia = (fdc->flags & FDC_ISPCMCIA) != 0;
543         fdc->rid_ioport = fdc->rid_irq = fdc->rid_drq = 0;
544         fdc->res_ioport = fdc->res_irq = fdc->res_drq = 0;
545
546         /*
547          * On standard ISA, we don't just use an 8 port range
548          * (e.g. 0x3f0-0x3f7) since that covers an IDE control
549          * register at 0x3f6.
550          *
551          * Isn't PC hardware wonderful.
552          *
553          * The Y-E Data PCMCIA FDC doesn't have this problem, it
554          * uses the register with offset 6 for pseudo-DMA, and the
555          * one with offset 7 as control register.
556          */
557         fdc->res_ioport = bus_alloc_resource(dev, SYS_RES_IOPORT,
558                                              &fdc->rid_ioport, 0ul, ~0ul, 
559                                              ispcmcia ? 8 : (ispnp ? 1 : 6),
560                                              RF_ACTIVE);
561         if (fdc->res_ioport == 0) {
562                 device_printf(dev, "cannot reserve I/O port range\n");
563                 return ENXIO;
564         }
565         fdc->portt = rman_get_bustag(fdc->res_ioport);
566         fdc->porth = rman_get_bushandle(fdc->res_ioport);
567
568         if (!ispcmcia) {
569                 /*
570                  * Some BIOSen report the device at 0x3f2-0x3f5,0x3f7
571                  * and some at 0x3f0-0x3f5,0x3f7. We detect the former
572                  * by checking the size and adjust the port address
573                  * accordingly.
574                  */
575                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 0) == 4)
576                         fdc->port_off = -2;
577
578                 /*
579                  * Register the control port range as rid 1 if it
580                  * isn't there already. Most PnP BIOSen will have
581                  * already done this but non-PnP configurations don't.
582                  *
583                  * And some (!!) report 0x3f2-0x3f5 and completely
584                  * leave out the control register!  It seems that some
585                  * non-antique controller chips have a different
586                  * method of programming the transfer speed which
587                  * doesn't require the control register, but it's
588                  * mighty bogus as the chip still responds to the
589                  * address for the control register.
590                  */
591                 if (bus_get_resource_count(dev, SYS_RES_IOPORT, 1) == 0) {
592                         u_long ctlstart;
593
594                         /* Find the control port, usually 0x3f7 */
595                         ctlstart = rman_get_start(fdc->res_ioport) +
596                                 fdc->port_off + 7;
597
598                         bus_set_resource(dev, SYS_RES_IOPORT, 1, ctlstart, 1);
599                 }
600
601                 /*
602                  * Now (finally!) allocate the control port.
603                  */
604                 fdc->rid_ctl = 1;
605                 fdc->res_ctl = bus_alloc_resource(dev, SYS_RES_IOPORT,
606                                                   &fdc->rid_ctl,
607                                                   0ul, ~0ul, 1, RF_ACTIVE);
608                 if (fdc->res_ctl == 0) {
609                         device_printf(dev,
610                                       "cannot reserve control I/O port range\n");
611                         return ENXIO;
612                 }
613                 fdc->ctlt = rman_get_bustag(fdc->res_ctl);
614                 fdc->ctlh = rman_get_bushandle(fdc->res_ctl);
615         }
616
617         fdc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ,
618                                           &fdc->rid_irq, 0ul, ~0ul, 1, 
619                                           RF_ACTIVE);
620         if (fdc->res_irq == 0) {
621                 device_printf(dev, "cannot reserve interrupt line\n");
622                 return ENXIO;
623         }
624
625         if ((fdc->flags & FDC_NODMA) == 0) {
626                 fdc->res_drq = bus_alloc_resource(dev, SYS_RES_DRQ,
627                                                   &fdc->rid_drq, 0ul, ~0ul, 1, 
628                                                   RF_ACTIVE);
629                 if (fdc->res_drq == 0) {
630                         device_printf(dev, "cannot reserve DMA request line\n");
631                         return ENXIO;
632                 }
633                 fdc->dmachan = fdc->res_drq->r_start;
634         }
635
636         return 0;
637 }
638
639 void
640 fdc_release_resources(struct fdc_data *fdc)
641 {
642         device_t dev;
643
644         dev = fdc->fdc_dev;
645         if (fdc->res_irq != 0) {
646                 bus_deactivate_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
647                                         fdc->res_irq);
648                 bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
649                                      fdc->res_irq);
650         }
651         if (fdc->res_ctl != 0) {
652                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
653                                         fdc->res_ctl);
654                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ctl,
655                                      fdc->res_ctl);
656         }
657         if (fdc->res_ioport != 0) {
658                 bus_deactivate_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
659                                         fdc->res_ioport);
660                 bus_release_resource(dev, SYS_RES_IOPORT, fdc->rid_ioport,
661                                      fdc->res_ioport);
662         }
663         if (fdc->res_drq != 0) {
664                 bus_deactivate_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
665                                         fdc->res_drq);
666                 bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
667                                      fdc->res_drq);
668         }
669 }
670
671 /****************************************************************************/
672 /*                      autoconfiguration stuff                             */
673 /****************************************************************************/
674
675 static struct isa_pnp_id fdc_ids[] = {
676         {0x0007d041, "PC standard floppy disk controller"}, /* PNP0700 */
677         {0x0107d041, "Standard floppy controller supporting MS Device Bay Spec"}, /* PNP0701 */
678         {0}
679 };
680
681 int
682 fdc_read_ivar(device_t dev, device_t child, int which, u_long *result)
683 {
684         struct fdc_ivars *ivars = device_get_ivars(child);
685
686         switch (which) {
687         case FDC_IVAR_FDUNIT:
688                 *result = ivars->fdunit;
689                 break;
690         default:
691                 return ENOENT;
692         }
693         return 0;
694 }
695
696 /*
697  * fdc controller section.
698  */
699 static int
700 fdc_probe(device_t dev)
701 {
702         int     error, ic_type;
703         struct  fdc_data *fdc;
704
705         fdc = device_get_softc(dev);
706         bzero(fdc, sizeof *fdc);
707         fdc->fdc_dev = dev;
708         fdc->fdctl_wr = fdctl_wr_isa;
709
710         /* Check pnp ids */
711         error = ISA_PNP_PROBE(device_get_parent(dev), dev, fdc_ids);
712         if (error == ENXIO)
713                 return ENXIO;
714         if (error == 0)
715                 fdc->flags |= FDC_ISPNP;
716
717         /* Attempt to allocate our resources for the duration of the probe */
718         error = fdc_alloc_resources(fdc);
719         if (error)
720                 goto out;
721
722         /* First - lets reset the floppy controller */
723         fdout_wr(fdc, 0);
724         DELAY(100);
725         fdout_wr(fdc, FDO_FRST);
726
727         /* see if it can handle a command */
728         if (fd_cmd(fdc, 3, NE7CMD_SPECIFY, NE7_SPEC_1(3, 240), 
729                    NE7_SPEC_2(2, 0), 0)) {
730                 error = ENXIO;
731                 goto out;
732         }
733
734         if (fd_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type) == 0) {
735                 ic_type = (u_char)ic_type;
736                 switch (ic_type) {
737                 case 0x80:
738                         device_set_desc(dev, "NEC 765 or clone");
739                         fdc->fdct = FDC_NE765;
740                         break;
741                 case 0x81:
742                         device_set_desc(dev, "Intel 82077 or clone");
743                         fdc->fdct = FDC_I82077;
744                         break;
745                 case 0x90:
746                         device_set_desc(dev, "NEC 72065B or clone");
747                         fdc->fdct = FDC_NE72065;
748                         break;
749                 default:
750                         device_set_desc(dev, "generic floppy controller");
751                         fdc->fdct = FDC_UNKNOWN;
752                         break;
753                 }
754         }
755
756 out:
757         fdc_release_resources(fdc);
758         return (error);
759 }
760
761 /*
762  * Add a child device to the fdc controller.  It will then be probed etc.
763  */
764 static void
765 fdc_add_child(device_t dev, const char *name, int unit)
766 {
767         int     disabled;
768         struct fdc_ivars *ivar;
769         device_t child;
770
771         ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_WAITOK | M_ZERO);
772         if (resource_int_value(name, unit, "drive", &ivar->fdunit) != 0)
773                 ivar->fdunit = 0;
774         child = device_add_child(dev, name, unit);
775         if (child == NULL)
776                 return;
777         device_set_ivars(child, ivar);
778         if (resource_int_value(name, unit, "disabled", &disabled) == 0
779             && disabled != 0)
780                 device_disable(child);
781 }
782
783 int
784 fdc_attach(device_t dev)
785 {
786         struct  fdc_data *fdc;
787         int     i, error;
788
789         fdc = device_get_softc(dev);
790         error = fdc_alloc_resources(fdc);
791         if (error) {
792                 device_printf(dev, "cannot re-aquire resources\n");
793                 return error;
794         }
795         error = BUS_SETUP_INTR(device_get_parent(dev), dev, fdc->res_irq,
796                                INTR_TYPE_BIO, fdc_intr, fdc, &fdc->fdc_intr);
797         if (error) {
798                 device_printf(dev, "cannot setup interrupt\n");
799                 return error;
800         }
801         fdc->fdcu = device_get_unit(dev);
802         fdc->flags |= FDC_ATTACHED;
803
804         if ((fdc->flags & FDC_NODMA) == 0) {
805                 /* Acquire the DMA channel forever, The driver will do the rest */
806                                 /* XXX should integrate with rman */
807                 isa_dma_acquire(fdc->dmachan);
808                 isa_dmainit(fdc->dmachan, 128 << 3 /* XXX max secsize */);
809         }
810         fdc->state = DEVIDLE;
811
812         /* reset controller, turn motor off, clear fdout mirror reg */
813         fdout_wr(fdc, ((fdc->fdout = 0)));
814         bufq_init(&fdc->head);
815
816         /*
817          * Probe and attach any children.  We should probably detect
818          * devices from the BIOS unless overridden.
819          */
820         for (i = resource_query_string(-1, "at", device_get_nameunit(dev));
821              i != -1;
822              i = resource_query_string(i, "at", device_get_nameunit(dev)))
823                 fdc_add_child(dev, resource_query_name(i),
824                                resource_query_unit(i));
825
826         return (bus_generic_attach(dev));
827 }
828
829 int
830 fdc_print_child(device_t me, device_t child)
831 {
832         int retval = 0;
833
834         retval += bus_print_child_header(me, child);
835         retval += printf(" on %s drive %d\n", device_get_nameunit(me),
836                fdc_get_fdunit(child));
837         
838         return (retval);
839 }
840
841 static device_method_t fdc_methods[] = {
842         /* Device interface */
843         DEVMETHOD(device_probe,         fdc_probe),
844         DEVMETHOD(device_attach,        fdc_attach),
845         DEVMETHOD(device_detach,        bus_generic_detach),
846         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
847         DEVMETHOD(device_suspend,       bus_generic_suspend),
848         DEVMETHOD(device_resume,        bus_generic_resume),
849
850         /* Bus interface */
851         DEVMETHOD(bus_print_child,      fdc_print_child),
852         DEVMETHOD(bus_read_ivar,        fdc_read_ivar),
853         /* Our children never use any other bus interface methods. */
854
855         { 0, 0 }
856 };
857
858 static driver_t fdc_driver = {
859         "fdc",
860         fdc_methods,
861         sizeof(struct fdc_data)
862 };
863
864 DRIVER_MODULE(fdc, isa, fdc_driver, fdc_devclass, 0, 0);
865
866 /******************************************************************/
867 /*
868  * devices attached to the controller section.  
869  */
870 static int
871 fd_probe(device_t dev)
872 {
873         int     i;
874         u_int   fdt, st0, st3;
875         struct  fd_data *fd;
876         struct  fdc_data *fdc;
877         fdsu_t  fdsu;
878         static int fd_fifo = 0;
879
880         fdsu = *(int *)device_get_ivars(dev); /* xxx cheat a bit... */
881         fd = device_get_softc(dev);
882         fdc = device_get_softc(device_get_parent(dev));
883
884         bzero(fd, sizeof *fd);
885         fd->dev = dev;
886         fd->fdc = fdc;
887         fd->fdsu = fdsu;
888         fd->fdu = device_get_unit(dev);
889
890 #ifdef __i386__
891         /* look up what bios thinks we have */
892         switch (fd->fdu) {
893         case 0:
894                 if ((fdc->flags & FDC_ISPCMCIA))
895                         fdt = RTCFDT_144M;
896                 else if (device_get_flags(fdc->fdc_dev) & FDC_PRETEND_D0)
897                         fdt = RTCFDT_144M | RTCFDT_144M_PRETENDED;
898                 else
899                         fdt = (rtcin(RTC_FDISKETTE) & 0xf0);
900                 break;
901         case 1:
902                 fdt = ((rtcin(RTC_FDISKETTE) << 4) & 0xf0);
903                 break;
904         default:
905                 fdt = RTCFDT_NONE;
906                 break;
907         }
908 #else
909         fdt = RTCFDT_144M;      /* XXX probably */
910 #endif
911
912         /* is there a unit? */
913         if (fdt == RTCFDT_NONE)
914                 return (ENXIO);
915
916         /* select it */
917         set_motor(fdc, fdsu, TURNON);
918         DELAY(1000000); /* 1 sec */
919
920         /* XXX This doesn't work before the first set_motor() */
921         if (fd_fifo == 0 && fdc->fdct != FDC_NE765 && fdc->fdct != FDC_UNKNOWN
922             && (device_get_flags(fdc->fdc_dev) & FDC_NO_FIFO) == 0
923             && enable_fifo(fdc) == 0) {
924                 device_printf(device_get_parent(dev),
925                     "FIFO enabled, %d bytes threshold\n", fifo_threshold);
926         }
927         fd_fifo = 1;
928
929         if ((fd_cmd(fdc, 2, NE7CMD_SENSED, fdsu, 1, &st3) == 0)
930             && (st3 & NE7_ST3_T0)) {
931                 /* if at track 0, first seek inwards */
932                 /* seek some steps: */
933                 fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0);
934                 DELAY(300000); /* ...wait a moment... */
935                 fd_sense_int(fdc, 0, 0); /* make ctrlr happy */
936         }
937
938         /* If we're at track 0 first seek inwards. */
939         if ((fd_sense_drive_status(fdc, &st3) == 0) && (st3 & NE7_ST3_T0)) {
940                 /* Seek some steps... */
941                 if (fd_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
942                         /* ...wait a moment... */
943                         DELAY(300000);
944                         /* make ctrlr happy: */
945                         fd_sense_int(fdc, 0, 0);
946                 }
947         }
948
949         for (i = 0; i < 2; i++) {
950                 /*
951                  * we must recalibrate twice, just in case the
952                  * heads have been beyond cylinder 76, since most
953                  * FDCs still barf when attempting to recalibrate
954                  * more than 77 steps
955                  */
956                 /* go back to 0: */
957                 if (fd_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
958                         /* a second being enough for full stroke seek*/
959                         DELAY(i == 0 ? 1000000 : 300000);
960
961                         /* anything responding? */
962                         if (fd_sense_int(fdc, &st0, 0) == 0 &&
963                             (st0 & NE7_ST0_EC) == 0)
964                                 break; /* already probed succesfully */
965                 }
966         }
967
968         set_motor(fdc, fdsu, TURNOFF);
969
970         if (st0 & NE7_ST0_EC) /* no track 0 -> no drive present */
971                 return (ENXIO);
972
973         fd->track = FD_NO_TRACK;
974         fd->fdc = fdc;
975         fd->fdsu = fdsu;
976         fd->options = 0;
977         callout_handle_init(&fd->toffhandle);
978         callout_handle_init(&fd->tohandle);
979
980         switch (fdt) {
981         case RTCFDT_12M:
982                 device_set_desc(dev, "1200-KB 5.25\" drive");
983                 fd->type = FD_1200;
984                 break;
985         case RTCFDT_144M | RTCFDT_144M_PRETENDED:
986                 device_set_desc(dev, "config-pretended 1440-MB 3.5\" drive");
987                 fdt = RTCFDT_144M;
988                 fd->type = FD_1440;
989         case RTCFDT_144M:
990                 device_set_desc(dev, "1440-KB 3.5\" drive");
991                 fd->type = FD_1440;
992                 break;
993         case RTCFDT_288M:
994         case RTCFDT_288M_1:
995                 device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
996                 fd->type = FD_1440;
997                 break;
998         case RTCFDT_360K:
999                 device_set_desc(dev, "360-KB 5.25\" drive");
1000                 fd->type = FD_360;
1001                 break;
1002         case RTCFDT_720K:
1003                 printf("720-KB 3.5\" drive");
1004                 fd->type = FD_720;
1005                 break;
1006         default:
1007                 return (ENXIO);
1008         }
1009         return (0);
1010 }
1011
1012 static int
1013 fd_attach(device_t dev)
1014 {
1015         struct  fd_data *fd;
1016 #if 0
1017         int     i;
1018         int     mynor;
1019         int     typemynor;
1020         int     typesize;
1021 #endif
1022
1023         fd = device_get_softc(dev);
1024
1025         cdevsw_add(&fd_cdevsw, -1 << 6, fd->fdu << 6);
1026         make_dev(&fd_cdevsw, (fd->fdu << 6),
1027                 UID_ROOT, GID_OPERATOR, 0640, "rfd%d", fd->fdu);
1028
1029 #if 0
1030         /* Other make_dev() go here. */
1031 #endif
1032
1033         /*
1034          * Export the drive to the devstat interface.
1035          */
1036         devstat_add_entry(&fd->device_stats, device_get_name(dev), 
1037                           device_get_unit(dev), 512, DEVSTAT_NO_ORDERED_TAGS,
1038                           DEVSTAT_TYPE_FLOPPY | DEVSTAT_TYPE_IF_OTHER,
1039                           DEVSTAT_PRIORITY_FD);
1040         return (0);
1041 }
1042
1043 static int
1044 fd_detach(device_t dev)
1045 {
1046         struct  fd_data *fd;
1047
1048         fd = device_get_softc(dev);
1049         untimeout(fd_turnoff, fd, fd->toffhandle);
1050
1051         return (0);
1052 }
1053
1054 static device_method_t fd_methods[] = {
1055         /* Device interface */
1056         DEVMETHOD(device_probe,         fd_probe),
1057         DEVMETHOD(device_attach,        fd_attach),
1058         DEVMETHOD(device_detach,        fd_detach),
1059         DEVMETHOD(device_shutdown,      bus_generic_shutdown),
1060         DEVMETHOD(device_suspend,       bus_generic_suspend), /* XXX */
1061         DEVMETHOD(device_resume,        bus_generic_resume), /* XXX */
1062
1063         { 0, 0 }
1064 };
1065
1066 static driver_t fd_driver = {
1067         "fd",
1068         fd_methods,
1069         sizeof(struct fd_data)
1070 };
1071
1072 DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, 0, 0);
1073
1074 /****************************************************************************/
1075 /*                            motor control stuff                           */
1076 /*              remember to not deselect the drive we're working on         */
1077 /****************************************************************************/
1078 static void
1079 set_motor(struct fdc_data *fdc, int fdsu, int turnon)
1080 {
1081         int fdout = fdc->fdout;
1082         int needspecify = 0;
1083
1084         if(turnon) {
1085                 fdout &= ~FDO_FDSEL;
1086                 fdout |= (FDO_MOEN0 << fdsu) + fdsu;
1087         } else
1088                 fdout &= ~(FDO_MOEN0 << fdsu);
1089
1090         if(!turnon
1091            && (fdout & (FDO_MOEN0+FDO_MOEN1+FDO_MOEN2+FDO_MOEN3)) == 0)
1092                 /* gonna turn off the last drive, put FDC to bed */
1093                 fdout &= ~ (FDO_FRST|FDO_FDMAEN);
1094         else {
1095                 /* make sure controller is selected and specified */
1096                 if((fdout & (FDO_FRST|FDO_FDMAEN)) == 0)
1097                         needspecify = 1;
1098                 fdout |= (FDO_FRST|FDO_FDMAEN);
1099         }
1100
1101         fdout_wr(fdc, fdout);
1102         fdc->fdout = fdout;
1103         TRACE1("[0x%x->FDOUT]", fdout);
1104
1105         if (needspecify) {
1106                 /*
1107                  * XXX
1108                  * special case: since we have just woken up the FDC
1109                  * from its sleep, we silently assume the command will
1110                  * be accepted, and do not test for a timeout
1111                  */
1112                 (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1113                              NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1114                              0);
1115                 if (fdc->flags & FDC_HAS_FIFO)
1116                         (void) enable_fifo(fdc);
1117         }
1118 }
1119
1120 static void
1121 fd_turnoff(void *xfd)
1122 {
1123         int     s;
1124         fd_p fd = xfd;
1125
1126         TRACE1("[fd%d: turnoff]", fd->fdu);
1127
1128         s = splbio();
1129         /*
1130          * Don't turn off the motor yet if the drive is active.
1131          *
1132          * If we got here, this could only mean we missed an interrupt.
1133          * This can e. g. happen on the Y-E Date PCMCIA floppy controller
1134          * after a controller reset.  Just schedule a pseudo-interrupt
1135          * so the state machine gets re-entered.
1136          */
1137         if (fd->fdc->state != DEVIDLE && fd->fdc->fdu == fd->fdu) {
1138                 fdc_intr(fd->fdc);
1139                 splx(s);
1140                 return;
1141         }
1142
1143         fd->flags &= ~FD_MOTOR;
1144         set_motor(fd->fdc, fd->fdsu, TURNOFF);
1145         splx(s);
1146 }
1147
1148 static void
1149 fd_motor_on(void *xfd)
1150 {
1151         int     s;
1152         fd_p fd = xfd;
1153
1154         s = splbio();
1155         fd->flags &= ~FD_MOTOR_WAIT;
1156         if((fd->fdc->fd == fd) && (fd->fdc->state == MOTORWAIT))
1157         {
1158                 fdc_intr(fd->fdc);
1159         }
1160         splx(s);
1161 }
1162
1163 static void
1164 fd_turnon(fd_p fd)
1165 {
1166         if(!(fd->flags & FD_MOTOR))
1167         {
1168                 fd->flags |= (FD_MOTOR + FD_MOTOR_WAIT);
1169                 set_motor(fd->fdc, fd->fdsu, TURNON);
1170                 timeout(fd_motor_on, fd, hz); /* in 1 sec its ok */
1171         }
1172 }
1173
1174 static void
1175 fdc_reset(fdc_p fdc)
1176 {
1177         /* Try a reset, keep motor on */
1178         fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1179         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
1180         DELAY(100);
1181         /* enable FDC, but defer interrupts a moment */
1182         fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
1183         TRACE1("[0x%x->FDOUT]", fdc->fdout & ~FDO_FDMAEN);
1184         DELAY(100);
1185         fdout_wr(fdc, fdc->fdout);
1186         TRACE1("[0x%x->FDOUT]", fdc->fdout);
1187
1188         /* XXX after a reset, silently believe the FDC will accept commands */
1189         (void)fd_cmd(fdc, 3, NE7CMD_SPECIFY,
1190                      NE7_SPEC_1(3, 240), NE7_SPEC_2(2, 0),
1191                      0);
1192         if (fdc->flags & FDC_HAS_FIFO)
1193                 (void) enable_fifo(fdc);
1194 }
1195
1196 /****************************************************************************/
1197 /*                             fdc in/out                                   */
1198 /****************************************************************************/
1199 /*
1200  * FDC IO functions, take care of the main status register, timeout
1201  * in case the desired status bits are never set.
1202  *
1203  * These PIO loops initially start out with short delays between
1204  * each iteration in the expectation that the required condition
1205  * is usually met quickly, so it can be handled immediately.  After
1206  * about 1 ms, stepping is increased to achieve a better timing
1207  * accuracy in the calls to DELAY().
1208  */
1209 static int
1210 fd_in(struct fdc_data *fdc, int *ptr)
1211 {
1212         int i, j, step;
1213
1214         for (j = 0, step = 1;
1215             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != (NE7_DIO|NE7_RQM) &&
1216             j < FDSTS_TIMEOUT;
1217             j += step) {
1218                 if (i == NE7_RQM)
1219                         return (fdc_err(fdc, "ready for output in input\n"));
1220                 if (j == 1000)
1221                         step = 1000;
1222                 DELAY(step);
1223         }
1224         if (j >= FDSTS_TIMEOUT)
1225                 return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
1226 #ifdef  FDC_DEBUG
1227         i = fddata_rd(fdc);
1228         TRACE1("[FDDATA->0x%x]", (unsigned char)i);
1229         *ptr = i;
1230         return (0);
1231 #else   /* !FDC_DEBUG */
1232         i = fddata_rd(fdc);
1233         if (ptr)
1234                 *ptr = i;
1235         return (0);
1236 #endif  /* FDC_DEBUG */
1237 }
1238
1239 static int
1240 out_fdc(struct fdc_data *fdc, int x)
1241 {
1242         int i, j, step;
1243
1244         for (j = 0, step = 1;
1245             (i = fdsts_rd(fdc) & (NE7_DIO|NE7_RQM)) != NE7_RQM &&
1246             j < FDSTS_TIMEOUT;
1247             j += step) {
1248                 if (i == (NE7_DIO|NE7_RQM))
1249                         return (fdc_err(fdc, "ready for input in output\n"));
1250                 if (j == 1000)
1251                         step = 1000;
1252                 DELAY(step);
1253         }
1254         if (j >= FDSTS_TIMEOUT)
1255                 return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
1256
1257         /* Send the command and return */
1258         fddata_wr(fdc, x);
1259         TRACE1("[0x%x->FDDATA]", x);
1260         return (0);
1261 }
1262
1263 /****************************************************************************/
1264 /*                           fdopen/fdclose                                 */
1265 /****************************************************************************/
1266 int
1267 Fdopen(dev_t dev, int flags, int mode, struct thread *td)
1268 {
1269         fdu_t fdu = FDUNIT(minor(dev));
1270         int type = FDTYPE(minor(dev));
1271         fd_p    fd;
1272         fdc_p   fdc;
1273
1274         /* check bounds */
1275         if ((fd = devclass_get_softc(fd_devclass, fdu)) == 0)
1276                 return (ENXIO);
1277         fdc = fd->fdc;
1278         if ((fdc == NULL) || (fd->type == NO_TYPE))
1279                 return (ENXIO);
1280         if (type > NUMDENS)
1281                 return (ENXIO);
1282         if (type == 0)
1283                 type = fd->type;
1284         else {
1285                 /*
1286                  * For each type of basic drive, make sure we are trying
1287                  * to open a type it can do,
1288                  */
1289                 if (type != fd->type) {
1290                         switch (fd->type) {
1291                         case FD_360:
1292                                 return (ENXIO);
1293                         case FD_720:
1294                                 if (   type != FD_820
1295                                     && type != FD_800
1296                                     && type != FD_640
1297                                    )
1298                                         return (ENXIO);
1299                                 break;
1300                         case FD_1200:
1301                                 switch (type) {
1302                                 case FD_1480:
1303                                         type = FD_1480in5_25;
1304                                         break;
1305                                 case FD_1440:
1306                                         type = FD_1440in5_25;
1307                                         break;
1308                                 case FD_1232:
1309                                         break;
1310                                 case FD_820:
1311                                         type = FD_820in5_25;
1312                                         break;
1313                                 case FD_800:
1314                                         type = FD_800in5_25;
1315                                         break;
1316                                 case FD_720:
1317                                         type = FD_720in5_25;
1318                                         break;
1319                                 case FD_640:
1320                                         type = FD_640in5_25;
1321                                         break;
1322                                 case FD_360:
1323                                         type = FD_360in5_25;
1324                                         break;
1325                                 default:
1326                                         return(ENXIO);
1327                                 }
1328                                 break;
1329                         case FD_1440:
1330                                 if (   type != FD_1720
1331                                     && type != FD_1480
1332                                     && type != FD_1200
1333                                     && type != FD_820
1334                                     && type != FD_800
1335                                     && type != FD_720
1336                                     && type != FD_640
1337                                     )
1338                                         return(ENXIO);
1339                                 break;
1340                         }
1341                 }
1342         }
1343         fd->ft = fd_types + type - 1;
1344         fd->flags |= FD_OPEN;
1345         /*
1346          * Clearing the DMA overrun counter at open time is a bit messy.
1347          * Since we're only managing one counter per controller, opening
1348          * the second drive could mess it up.  Anyway, if the DMA overrun
1349          * condition is really persistent, it will eventually time out
1350          * still.  OTOH, clearing it here will ensure we'll at least start
1351          * trying again after a previous (maybe even long ago) failure.
1352          * Also, this is merely a stop-gap measure only that should not
1353          * happen during normal operation, so we can tolerate it to be a
1354          * bit sloppy about this.
1355          */
1356         fdc->dma_overruns = 0;
1357
1358         return 0;
1359 }
1360
1361 int
1362 fdclose(dev_t dev, int flags, int mode, struct thread *td)
1363 {
1364         fdu_t fdu = FDUNIT(minor(dev));
1365         struct fd_data *fd;
1366
1367         fd = devclass_get_softc(fd_devclass, fdu);
1368         fd->flags &= ~FD_OPEN;
1369         fd->options &= ~(FDOPT_NORETRY | FDOPT_NOERRLOG);
1370
1371         return (0);
1372 }
1373
1374 /****************************************************************************/
1375 /*                               fdstrategy                                 */
1376 /****************************************************************************/
1377 void
1378 fdstrategy(struct buf *bp)
1379 {
1380         unsigned nblocks, blknum, cando;
1381         int     s;
1382         fdu_t   fdu;
1383         fdc_p   fdc;
1384         fd_p    fd;
1385         size_t  fdblk;
1386
1387         fdu = FDUNIT(minor(bp->b_dev));
1388         fd = devclass_get_softc(fd_devclass, fdu);
1389         if (fd == 0)
1390                 panic("fdstrategy: buf for nonexistent device (%#lx, %#lx)",
1391                       (u_long)major(bp->b_dev), (u_long)minor(bp->b_dev));
1392         fdc = fd->fdc;
1393         if (fd->type == NO_TYPE) {
1394                 bp->b_error = ENXIO;
1395                 bp->b_flags |= B_ERROR;
1396                 goto bad;
1397         };
1398
1399         fdblk = 128 << (fd->ft->secsize);
1400         if (!(bp->b_flags & B_FORMAT)) {
1401                 if (bp->b_blkno < 0) {
1402                         printf(
1403                 "fd%d: fdstrat: bad request blkno = %lu, bcount = %ld\n",
1404                                fdu, (u_long)bp->b_blkno, bp->b_bcount);
1405                         bp->b_error = EINVAL;
1406                         bp->b_flags |= B_ERROR;
1407                         goto bad;
1408                 }
1409                 if ((bp->b_bcount % fdblk) != 0) {
1410                         bp->b_error = EINVAL;
1411                         bp->b_flags |= B_ERROR;
1412                         goto bad;
1413                 }
1414         }
1415
1416         /*
1417          * Set up block calculations.
1418          */
1419         if (bp->b_blkno > 20000000) {
1420                 /*
1421                  * Reject unreasonably high block number, prevent the
1422                  * multiplication below from overflowing.
1423                  */
1424                 bp->b_error = EINVAL;
1425                 bp->b_flags |= B_ERROR;
1426                 goto bad;
1427         }
1428         blknum = (unsigned) bp->b_blkno * DEV_BSIZE/fdblk;
1429         nblocks = fd->ft->size;
1430         bp->b_resid = 0;
1431         if (blknum + (bp->b_bcount / fdblk) > nblocks) {
1432                 if (blknum <= nblocks) {
1433                         cando = (nblocks - blknum) * fdblk;
1434                         bp->b_resid = bp->b_bcount - cando;
1435                         if (cando == 0)
1436                                 goto bad;       /* not actually bad but EOF */
1437                 } else {
1438                         bp->b_error = EINVAL;
1439                         bp->b_flags |= B_ERROR;
1440                         goto bad;
1441                 }
1442         }
1443         bp->b_pblkno = bp->b_blkno;
1444         s = splbio();
1445         bufqdisksort(&fdc->head, bp);
1446         untimeout(fd_turnoff, fd, fd->toffhandle); /* a good idea */
1447
1448         /* Tell devstat we are starting on the transaction */
1449         devstat_start_transaction(&fd->device_stats);
1450         device_busy(fd->dev);
1451
1452         fdstart(fdc);
1453         splx(s);
1454         return;
1455
1456 bad:
1457         biodone(bp);
1458 }
1459
1460 /***************************************************************\
1461 *                               fdstart                         *
1462 * We have just queued something.. if the controller is not busy *
1463 * then simulate the case where it has just finished a command   *
1464 * So that it (the interrupt routine) looks on the queue for more*
1465 * work to do and picks up what we just added.                   *
1466 * If the controller is already busy, we need do nothing, as it  *
1467 * will pick up our work when the present work completes         *
1468 \***************************************************************/
1469 static void
1470 fdstart(struct fdc_data *fdc)
1471 {
1472         int s;
1473
1474         s = splbio();
1475         if(fdc->state == DEVIDLE)
1476         {
1477                 fdc_intr(fdc);
1478         }
1479         splx(s);
1480 }
1481
1482 static void
1483 fd_iotimeout(void *xfdc)
1484 {
1485         fdc_p fdc;
1486         int s;
1487
1488         fdc = xfdc;
1489         TRACE1("fd%d[fd_iotimeout()]", fdc->fdu);
1490
1491         /*
1492          * Due to IBM's brain-dead design, the FDC has a faked ready
1493          * signal, hardwired to ready == true. Thus, any command
1494          * issued if there's no diskette in the drive will _never_
1495          * complete, and must be aborted by resetting the FDC.
1496          * Many thanks, Big Blue!
1497          * The FDC must not be reset directly, since that would
1498          * interfere with the state machine.  Instead, pretend that
1499          * the command completed but was invalid.  The state machine
1500          * will reset the FDC and retry once.
1501          */
1502         s = splbio();
1503         fdc->status[0] = NE7_ST0_IC_IV;
1504         fdc->flags &= ~FDC_STAT_VALID;
1505         fdc->state = IOTIMEDOUT;
1506         fdc_intr(fdc);
1507         splx(s);
1508 }
1509
1510 /* just ensure it has the right spl */
1511 static void
1512 fd_pseudointr(void *xfdc)
1513 {
1514         int     s;
1515
1516         s = splbio();
1517         fdc_intr(xfdc);
1518         splx(s);
1519 }
1520
1521 /***********************************************************************\
1522 *                                 fdintr                                *
1523 * keep calling the state machine until it returns a 0                   *
1524 * ALWAYS called at SPLBIO                                               *
1525 \***********************************************************************/
1526 static void
1527 fdc_intr(void *xfdc)
1528 {
1529         fdc_p fdc = xfdc;
1530         while(fdstate(fdc))
1531                 ;
1532 }
1533
1534 /*
1535  * magic pseudo-DMA initialization for YE FDC. Sets count and
1536  * direction
1537  */
1538 #define SET_BCDR(fdc,wr,cnt,port) \
1539         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port,  \
1540             ((cnt)-1) & 0xff);                                           \
1541         bus_space_write_1(fdc->portt, fdc->porth, fdc->port_off + port + 1, \
1542             ((wr ? 0x80 : 0) | ((((cnt)-1) >> 8) & 0x7f)));
1543
1544 /*
1545  * fdcpio(): perform programmed IO read/write for YE PCMCIA floppy
1546  */
1547 static int fdcpio(fdc_p fdc, long flags, caddr_t addr, u_int count)
1548 {
1549         u_char *cptr = (u_char *)addr;
1550
1551         if (flags & B_READ) {
1552                 if (fdc->state != PIOREAD) {
1553                         fdc->state = PIOREAD;
1554                         return(0);
1555                 };
1556                 SET_BCDR(fdc, 0, count, 0);
1557                 bus_space_read_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1558                     FDC_YE_DATAPORT, cptr, count);
1559         } else {
1560                 bus_space_write_multi_1(fdc->portt, fdc->porth, fdc->port_off +
1561                     FDC_YE_DATAPORT, cptr, count);
1562                 SET_BCDR(fdc, 0, count, 0);
1563         };
1564         return(1);
1565 }
1566
1567 /***********************************************************************\
1568 * The controller state machine.                                         *
1569 * if it returns a non zero value, it should be called again immediatly  *
1570 \***********************************************************************/
1571 static int
1572 fdstate(fdc_p fdc)
1573 {
1574         int read, format, head, i, sec = 0, sectrac, st0, cyl, st3;
1575         unsigned blknum = 0, b_cylinder = 0;
1576         fdu_t fdu = fdc->fdu;
1577         fd_p fd;
1578         struct buf *bp;
1579         struct fd_formb *finfo = NULL;
1580         size_t fdblk;
1581
1582         bp = fdc->bp;
1583         if (bp == NULL) {
1584                 bp = bufq_first(&fdc->head);
1585                 if (bp != NULL) {
1586                         bufq_remove(&fdc->head, bp);
1587                         fdc->bp = bp;
1588                 }
1589         }
1590         if (bp == NULL) {
1591                 /***********************************************\
1592                 * nothing left for this controller to do        *
1593                 * Force into the IDLE state,                    *
1594                 \***********************************************/
1595                 fdc->state = DEVIDLE;
1596                 if (fdc->fd) {
1597                         device_printf(fdc->fdc_dev,
1598                             "unexpected valid fd pointer\n");
1599                         fdc->fd = (fd_p) 0;
1600                         fdc->fdu = -1;
1601                 }
1602                 TRACE1("[fdc%d IDLE]", fdc->fdcu);
1603                 return (0);
1604         }
1605         fdu = FDUNIT(minor(bp->b_dev));
1606         fd = devclass_get_softc(fd_devclass, fdu);
1607         fdblk = 128 << fd->ft->secsize;
1608         if (fdc->fd && (fd != fdc->fd))
1609                 device_printf(fd->dev, "confused fd pointers\n");
1610         read = bp->b_flags & B_READ;
1611         format = bp->b_flags & B_FORMAT;
1612         if (format) {
1613                 finfo = (struct fd_formb *)bp->b_data;
1614                 fd->skip = (char *)&(finfo->fd_formb_cylno(0))
1615                         - (char *)finfo;
1616         }
1617         if (fdc->state == DOSEEK || fdc->state == SEEKCOMPLETE) {
1618                 blknum = (unsigned) bp->b_pblkno * DEV_BSIZE/fdblk +
1619                         fd->skip/fdblk;
1620                 b_cylinder = blknum / (fd->ft->sectrac * fd->ft->heads);
1621         }
1622         TRACE1("fd%d", fdu);
1623         TRACE1("[%s]", fdstates[fdc->state]);
1624         TRACE1("(0x%x)", fd->flags);
1625         untimeout(fd_turnoff, fd, fd->toffhandle);
1626         fd->toffhandle = timeout(fd_turnoff, fd, 4 * hz);
1627         switch (fdc->state)
1628         {
1629         case DEVIDLE:
1630         case FINDWORK:  /* we have found new work */
1631                 fdc->retry = 0;
1632                 fd->skip = 0;
1633                 fdc->fd = fd;
1634                 fdc->fdu = fdu;
1635                 fdc->fdctl_wr(fdc, fd->ft->trans);
1636                 TRACE1("[0x%x->FDCTL]", fd->ft->trans);
1637                 /*******************************************************\
1638                 * If the next drive has a motor startup pending, then   *
1639                 * it will start up in its own good time         *
1640                 \*******************************************************/
1641                 if(fd->flags & FD_MOTOR_WAIT) {
1642                         fdc->state = MOTORWAIT;
1643                         return (0); /* come back later */
1644                 }
1645                 /*******************************************************\
1646                 * Maybe if it's not starting, it SHOULD be starting     *
1647                 \*******************************************************/
1648                 if (!(fd->flags & FD_MOTOR))
1649                 {
1650                         fdc->state = MOTORWAIT;
1651                         fd_turnon(fd);
1652                         return (0);
1653                 }
1654                 else    /* at least make sure we are selected */
1655                 {
1656                         set_motor(fdc, fd->fdsu, TURNON);
1657                 }
1658                 if (fdc->flags & FDC_NEEDS_RESET) {
1659                         fdc->state = RESETCTLR;
1660                         fdc->flags &= ~FDC_NEEDS_RESET;
1661                 } else
1662                         fdc->state = DOSEEK;
1663                 break;
1664         case DOSEEK:
1665                 if (b_cylinder == (unsigned)fd->track)
1666                 {
1667                         fdc->state = SEEKCOMPLETE;
1668                         break;
1669                 }
1670                 if (fd_cmd(fdc, 3, NE7CMD_SEEK,
1671                            fd->fdsu, b_cylinder * fd->ft->steptrac,
1672                            0))
1673                 {
1674                         /*
1675                          * seek command not accepted, looks like
1676                          * the FDC went off to the Saints...
1677                          */
1678                         fdc->retry = 6; /* try a reset */
1679                         return(retrier(fdc));
1680                 }
1681                 fd->track = FD_NO_TRACK;
1682                 fdc->state = SEEKWAIT;
1683                 return(0);      /* will return later */
1684         case SEEKWAIT:
1685                 /* allow heads to settle */
1686                 timeout(fd_pseudointr, fdc, hz / 16);
1687                 fdc->state = SEEKCOMPLETE;
1688                 return(0);      /* will return later */
1689         case SEEKCOMPLETE : /* SEEK DONE, START DMA */
1690                 /* Make sure seek really happened*/
1691                 if(fd->track == FD_NO_TRACK) {
1692                         int descyl = b_cylinder * fd->ft->steptrac;
1693                         do {
1694                                 /*
1695                                  * This might be a "ready changed" interrupt,
1696                                  * which cannot really happen since the
1697                                  * RDY pin is hardwired to + 5 volts.  This
1698                                  * generally indicates a "bouncing" intr
1699                                  * line, so do one of the following:
1700                                  *
1701                                  * When running on an enhanced FDC that is
1702                                  * known to not go stuck after responding
1703                                  * with INVALID, fetch all interrupt states
1704                                  * until seeing either an INVALID or a
1705                                  * real interrupt condition.
1706                                  *
1707                                  * When running on a dumb old NE765, give
1708                                  * up immediately.  The controller will
1709                                  * provide up to four dummy RC interrupt
1710                                  * conditions right after reset (for the
1711                                  * corresponding four drives), so this is
1712                                  * our only chance to get notice that it
1713                                  * was not the FDC that caused the interrupt.
1714                                  */
1715                                 if (fd_sense_int(fdc, &st0, &cyl)
1716                                     == FD_NOT_VALID)
1717                                         return 0;
1718                                 if(fdc->fdct == FDC_NE765
1719                                    && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
1720                                         return 0; /* hope for a real intr */
1721                         } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
1722
1723                         if (0 == descyl) {
1724                                 int failed = 0;
1725                                 /*
1726                                  * seek to cyl 0 requested; make sure we are
1727                                  * really there
1728                                  */
1729                                 if (fd_sense_drive_status(fdc, &st3))
1730                                         failed = 1;
1731                                 if ((st3 & NE7_ST3_T0) == 0) {
1732                                         printf(
1733                 "fd%d: Seek to cyl 0, but not really there (ST3 = %b)\n",
1734                                                fdu, st3, NE7_ST3BITS);
1735                                         failed = 1;
1736                                 }
1737
1738                                 if (failed) {
1739                                         if(fdc->retry < 3)
1740                                                 fdc->retry = 3;
1741                                         return (retrier(fdc));
1742                                 }
1743                         }
1744
1745                         if (cyl != descyl) {
1746                                 printf(
1747                 "fd%d: Seek to cyl %d failed; am at cyl %d (ST0 = 0x%x)\n",
1748                                        fdu, descyl, cyl, st0);
1749                                 if (fdc->retry < 3)
1750                                         fdc->retry = 3;
1751                                 return (retrier(fdc));
1752                         }
1753                 }
1754
1755                 fd->track = b_cylinder;
1756                 if (!(fdc->flags & FDC_NODMA))
1757                         isa_dmastart(bp->b_flags, bp->b_data+fd->skip,
1758                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1759                 sectrac = fd->ft->sectrac;
1760                 sec = blknum %  (sectrac * fd->ft->heads);
1761                 head = sec / sectrac;
1762                 sec = sec % sectrac + 1;
1763                 fd->hddrv = ((head&1)<<2)+fdu;
1764
1765                 if(format || !read)
1766                 {
1767                         /* make sure the drive is writable */
1768                         if(fd_sense_drive_status(fdc, &st3) != 0)
1769                         {
1770                                 /* stuck controller? */
1771                                 if (!(fdc->flags & FDC_NODMA))
1772                                         isa_dmadone(bp->b_flags,
1773                                                     bp->b_data + fd->skip,
1774                                                     format ? bp->b_bcount : fdblk,
1775                                                     fdc->dmachan);
1776                                 fdc->retry = 6; /* reset the beast */
1777                                 return (retrier(fdc));
1778                         }
1779                         if(st3 & NE7_ST3_WP)
1780                         {
1781                                 /*
1782                                  * XXX YES! this is ugly.
1783                                  * in order to force the current operation
1784                                  * to fail, we will have to fake an FDC
1785                                  * error - all error handling is done
1786                                  * by the retrier()
1787                                  */
1788                                 fdc->status[0] = NE7_ST0_IC_AT;
1789                                 fdc->status[1] = NE7_ST1_NW;
1790                                 fdc->status[2] = 0;
1791                                 fdc->status[3] = fd->track;
1792                                 fdc->status[4] = head;
1793                                 fdc->status[5] = sec;
1794                                 fdc->retry = 8; /* break out immediately */
1795                                 fdc->state = IOTIMEDOUT; /* not really... */
1796                                 return (1);
1797                         }
1798                 }
1799
1800                 if (format) {
1801                         if (fdc->flags & FDC_NODMA) {
1802                                 /*
1803                                  * This seems to be necessary for
1804                                  * whatever obscure reason; if we omit
1805                                  * it, we end up filling the sector ID
1806                                  * fields of the newly formatted track
1807                                  * entirely with garbage, causing
1808                                  * `wrong cylinder' errors all over
1809                                  * the place when trying to read them
1810                                  * back.
1811                                  *
1812                                  * Umpf.
1813                                  */
1814                                 SET_BCDR(fdc, 1, bp->b_bcount, 0);
1815
1816                                 (void)fdcpio(fdc,bp->b_flags,
1817                                         bp->b_data+fd->skip,
1818                                         bp->b_bcount);
1819
1820                         }
1821                         /* formatting */
1822                         if(fd_cmd(fdc, 6,  NE7CMD_FORMAT, head << 2 | fdu,
1823                                   finfo->fd_formb_secshift,
1824                                   finfo->fd_formb_nsecs,
1825                                   finfo->fd_formb_gaplen,
1826                                   finfo->fd_formb_fillbyte, 0)) {
1827                                 /* controller fell over */
1828                                 if (!(fdc->flags & FDC_NODMA))
1829                                         isa_dmadone(bp->b_flags,
1830                                                     bp->b_data + fd->skip,
1831                                                     format ? bp->b_bcount : fdblk,
1832                                                     fdc->dmachan);
1833                                 fdc->retry = 6;
1834                                 return (retrier(fdc));
1835                         }
1836                 } else {
1837                         if (fdc->flags & FDC_NODMA) {
1838                                 /*
1839                                  * this seems to be necessary even when
1840                                  * reading data
1841                                  */
1842                                 SET_BCDR(fdc, 1, fdblk, 0);
1843
1844                                 /*
1845                                  * perform the write pseudo-DMA before
1846                                  * the WRITE command is sent
1847                                  */
1848                                 if (!read)
1849                                         (void)fdcpio(fdc,bp->b_flags,
1850                                             bp->b_data+fd->skip,
1851                                             fdblk);
1852                         }
1853                         if (fd_cmd(fdc, 9,
1854                                    (read ? NE7CMD_READ : NE7CMD_WRITE),
1855                                    head << 2 | fdu,  /* head & unit */
1856                                    fd->track,        /* track */
1857                                    head,
1858                                    sec,              /* sector + 1 */
1859                                    fd->ft->secsize,  /* sector size */
1860                                    sectrac,          /* sectors/track */
1861                                    fd->ft->gap,      /* gap size */
1862                                    fd->ft->datalen,  /* data length */
1863                                    0)) {
1864                                 /* the beast is sleeping again */
1865                                 if (!(fdc->flags & FDC_NODMA))
1866                                         isa_dmadone(bp->b_flags,
1867                                                     bp->b_data + fd->skip,
1868                                                     format ? bp->b_bcount : fdblk,
1869                                                     fdc->dmachan);
1870                                 fdc->retry = 6;
1871                                 return (retrier(fdc));
1872                         }
1873                 }
1874                 if (fdc->flags & FDC_NODMA)
1875                         /*
1876                          * if this is a read, then simply await interrupt
1877                          * before performing PIO
1878                          */
1879                         if (read && !fdcpio(fdc,bp->b_flags,
1880                             bp->b_data+fd->skip,fdblk)) {
1881                                 fd->tohandle = timeout(fd_iotimeout, fdc, hz);
1882                                 return(0);      /* will return later */
1883                         };
1884
1885                 /*
1886                  * write (or format) operation will fall through and
1887                  * await completion interrupt
1888                  */
1889                 fdc->state = IOCOMPLETE;
1890                 fd->tohandle = timeout(fd_iotimeout, fdc, hz);
1891                 return (0);     /* will return later */
1892         case PIOREAD:
1893                 /* 
1894                  * actually perform the PIO read.  The IOCOMPLETE case
1895                  * removes the timeout for us.  
1896                  */
1897                 (void)fdcpio(fdc,bp->b_flags,bp->b_data+fd->skip,fdblk);
1898                 fdc->state = IOCOMPLETE;
1899                 /* FALLTHROUGH */
1900         case IOCOMPLETE: /* IO DONE, post-analyze */
1901                 untimeout(fd_iotimeout, fdc, fd->tohandle);
1902
1903                 if (fd_read_status(fdc, fd->fdsu)) {
1904                         if (!(fdc->flags & FDC_NODMA))
1905                                 isa_dmadone(bp->b_flags, bp->b_data + fd->skip,
1906                                             format ? bp->b_bcount : fdblk,
1907                                             fdc->dmachan);
1908                         if (fdc->retry < 6)
1909                                 fdc->retry = 6; /* force a reset */
1910                         return (retrier(fdc));
1911                 }
1912
1913                 fdc->state = IOTIMEDOUT;
1914
1915                 /* FALLTHROUGH */
1916
1917         case IOTIMEDOUT:
1918                 if (!(fdc->flags & FDC_NODMA))
1919                         isa_dmadone(bp->b_flags, bp->b_data + fd->skip,
1920                                 format ? bp->b_bcount : fdblk, fdc->dmachan);
1921                 if (fdc->status[0] & NE7_ST0_IC) {
1922                         if ((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1923                             && fdc->status[1] & NE7_ST1_OR) {
1924                                 /*
1925                                  * DMA overrun. Someone hogged the bus and
1926                                  * didn't release it in time for the next
1927                                  * FDC transfer.
1928                                  *
1929                                  * We normally restart this without bumping
1930                                  * the retry counter.  However, in case
1931                                  * something is seriously messed up (like
1932                                  * broken hardware), we rather limit the
1933                                  * number of retries so the IO operation
1934                                  * doesn't block indefinately.
1935                                  */
1936                                 if (fdc->dma_overruns++ < FDC_DMAOV_MAX) {
1937                                         fdc->state = SEEKCOMPLETE;
1938                                         return (1);
1939                                 } /* else fall through */
1940                         }
1941                         if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_IV
1942                                 && fdc->retry < 6)
1943                                 fdc->retry = 6; /* force a reset */
1944                         else if((fdc->status[0] & NE7_ST0_IC) == NE7_ST0_IC_AT
1945                                 && fdc->status[2] & NE7_ST2_WC
1946                                 && fdc->retry < 3)
1947                                 fdc->retry = 3; /* force recalibrate */
1948                         return (retrier(fdc));
1949                 }
1950                 /* All OK */
1951                 /* Operation successful, retry DMA overruns again next time. */
1952                 fdc->dma_overruns = 0;
1953                 fd->skip += fdblk;
1954                 if (!format && fd->skip < bp->b_bcount - bp->b_resid) {
1955                         /* set up next transfer */
1956                         fdc->state = DOSEEK;
1957                 } else {
1958                         /* ALL DONE */
1959                         fd->skip = 0;
1960                         fdc->bp = NULL;
1961                         device_unbusy(fd->dev);
1962                         devstat_end_transaction_buf(&fd->device_stats, bp);
1963                         biodone(bp);
1964                         fdc->fd = (fd_p) 0;
1965                         fdc->fdu = -1;
1966                         fdc->state = FINDWORK;
1967                 }
1968                 return (1);
1969         case RESETCTLR:
1970                 fdc_reset(fdc);
1971                 fdc->retry++;
1972                 fdc->state = RESETCOMPLETE;
1973                 return (0);
1974         case RESETCOMPLETE:
1975                 /*
1976                  * Discard all the results from the reset so that they
1977                  * can't cause an unexpected interrupt later.
1978                  */
1979                 for (i = 0; i < 4; i++)
1980                         (void)fd_sense_int(fdc, &st0, &cyl);
1981                 fdc->state = STARTRECAL;
1982                 /* Fall through. */
1983         case STARTRECAL:
1984                 if(fd_cmd(fdc, 2, NE7CMD_RECAL, fdu, 0)) {
1985                         /* arrgl */
1986                         fdc->retry = 6;
1987                         return (retrier(fdc));
1988                 }
1989                 fdc->state = RECALWAIT;
1990                 return (0);     /* will return later */
1991         case RECALWAIT:
1992                 /* allow heads to settle */
1993                 timeout(fd_pseudointr, fdc, hz / 8);
1994                 fdc->state = RECALCOMPLETE;
1995                 return (0);     /* will return later */
1996         case RECALCOMPLETE:
1997                 do {
1998                         /*
1999                          * See SEEKCOMPLETE for a comment on this:
2000                          */
2001                         if (fd_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
2002                                 return 0;
2003                         if(fdc->fdct == FDC_NE765
2004                            && (st0 & NE7_ST0_IC) == NE7_ST0_IC_RC)
2005                                 return 0; /* hope for a real intr */
2006                 } while ((st0 & NE7_ST0_IC) == NE7_ST0_IC_RC);
2007                 if ((st0 & NE7_ST0_IC) != NE7_ST0_IC_NT || cyl != 0)
2008                 {
2009                         if(fdc->retry > 3)
2010                                 /*
2011                                  * a recalibrate from beyond cylinder 77
2012                                  * will "fail" due to the FDC limitations;
2013                                  * since people used to complain much about
2014                                  * the failure message, try not logging
2015                                  * this one if it seems to be the first
2016                                  * time in a line
2017                                  */
2018                                 printf("fd%d: recal failed ST0 %b cyl %d\n",
2019                                        fdu, st0, NE7_ST0BITS, cyl);
2020                         if(fdc->retry < 3) fdc->retry = 3;
2021                         return (retrier(fdc));
2022                 }
2023                 fd->track = 0;
2024                 /* Seek (probably) necessary */
2025                 fdc->state = DOSEEK;
2026                 return (1);     /* will return immediatly */
2027         case MOTORWAIT:
2028                 if(fd->flags & FD_MOTOR_WAIT)
2029                 {
2030                         return (0); /* time's not up yet */
2031                 }
2032                 if (fdc->flags & FDC_NEEDS_RESET) {
2033                         fdc->state = RESETCTLR;
2034                         fdc->flags &= ~FDC_NEEDS_RESET;
2035                 } else {
2036                         /*
2037                          * If all motors were off, then the controller was
2038                          * reset, so it has lost track of the current
2039                          * cylinder.  Recalibrate to handle this case.
2040                          * But first, discard the results of the reset.
2041                          */
2042                         fdc->state = RESETCOMPLETE;
2043                 }
2044                 return (1);     /* will return immediatly */
2045         default:
2046                 device_printf(fdc->fdc_dev, "unexpected FD int->");
2047                 if (fd_read_status(fdc, fd->fdsu) == 0)
2048                         printf("FDC status :%x %x %x %x %x %x %x   ",
2049                                fdc->status[0],
2050                                fdc->status[1],
2051                                fdc->status[2],
2052                                fdc->status[3],
2053                                fdc->status[4],
2054                                fdc->status[5],
2055                                fdc->status[6] );
2056                 else
2057                         printf("No status available   ");
2058                 if (fd_sense_int(fdc, &st0, &cyl) != 0)
2059                 {
2060                         printf("[controller is dead now]\n");
2061                         return (0);
2062                 }
2063                 printf("ST0 = %x, PCN = %x\n", st0, cyl);
2064                 return (0);
2065         }
2066         /*XXX confusing: some branches return immediately, others end up here*/
2067         return (1); /* Come back immediatly to new state */
2068 }
2069
2070 static int
2071 retrier(struct fdc_data *fdc)
2072 {
2073         struct buf *bp;
2074         struct fd_data *fd;
2075         int fdu;
2076
2077         bp = fdc->bp;
2078
2079         /* XXX shouldn't this be cached somewhere?  */
2080         fdu = FDUNIT(minor(bp->b_dev));
2081         fd = devclass_get_softc(fd_devclass, fdu);
2082         if (fd->options & FDOPT_NORETRY)
2083                 goto fail;
2084
2085         switch (fdc->retry) {
2086         case 0: case 1: case 2:
2087                 fdc->state = SEEKCOMPLETE;
2088                 break;
2089         case 3: case 4: case 5:
2090                 fdc->state = STARTRECAL;
2091                 break;
2092         case 6:
2093                 fdc->state = RESETCTLR;
2094                 break;
2095         case 7:
2096                 break;
2097         default:
2098         fail:
2099                 {
2100                         int printerror = (fd->options & FDOPT_NOERRLOG) == 0;
2101                         dev_t sav_b_dev;
2102
2103                         /* Trick diskerr */
2104                         if (printerror) {
2105                                 sav_b_dev = bp->b_dev;
2106                                 bp->b_dev = make_sub_dev(bp->b_dev,
2107                                     (FDUNIT(minor(bp->b_dev))<<3)|RAW_PART);
2108                                 diskerr(bp, "hard error", LOG_PRINTF,
2109                                         fdc->fd->skip / DEV_BSIZE,
2110                                         (struct disklabel *)NULL);
2111                                 bp->b_dev = sav_b_dev;
2112                         }
2113                         if (printerror) {
2114                                 if (fdc->flags & FDC_STAT_VALID)
2115                                         printf(
2116                         " (ST0 %b ST1 %b ST2 %b cyl %u hd %u sec %u)\n",
2117                                                fdc->status[0], NE7_ST0BITS,
2118                                                fdc->status[1], NE7_ST1BITS,
2119                                                fdc->status[2], NE7_ST2BITS,
2120                                                fdc->status[3], fdc->status[4],
2121                                                fdc->status[5]);
2122                                 else
2123                                         printf(" (No status)\n");
2124                         }
2125                 }
2126                 bp->b_flags |= B_ERROR;
2127                 bp->b_error = EIO;
2128                 bp->b_resid += bp->b_bcount - fdc->fd->skip;
2129                 fdc->bp = NULL;
2130                 fdc->fd->skip = 0;
2131                 device_unbusy(fd->dev);
2132                 devstat_end_transaction_buf(&fdc->fd->device_stats, bp);
2133                 biodone(bp);
2134                 fdc->state = FINDWORK;
2135                 fdc->flags |= FDC_NEEDS_RESET;
2136                 fdc->fd = (fd_p) 0;
2137                 fdc->fdu = -1;
2138                 return (1);
2139         }
2140         fdc->retry++;
2141         return (1);
2142 }
2143
2144 static int
2145 fdformat(dev_t dev, struct fd_formb *finfo, struct thread *td)
2146 {
2147         struct proc *p = td->td_proc;
2148         fdu_t   fdu;
2149         fd_p    fd;
2150
2151         struct buf *bp;
2152         int rv = 0, s;
2153         size_t fdblk;
2154
2155         fdu     = FDUNIT(minor(dev));
2156         fd      = devclass_get_softc(fd_devclass, fdu);
2157         fdblk = 128 << fd->ft->secsize;
2158
2159         /* set up a buffer header for fdstrategy() */
2160         bp = malloc(sizeof(struct buf), M_TEMP, M_WAITOK | M_ZERO);
2161
2162         /*
2163          * keep the process from being swapped
2164          */
2165         PHOLD(p);
2166         BUF_LOCKINIT(bp);
2167         BUF_LOCK(bp, LK_EXCLUSIVE);
2168         bp->b_flags = B_PHYS | B_FORMAT;
2169
2170         /*
2171          * calculate a fake blkno, so fdstrategy() would initiate a
2172          * seek to the requested cylinder
2173          */
2174         bp->b_blkno = (finfo->cyl * (fd->ft->sectrac * fd->ft->heads)
2175                 + finfo->head * fd->ft->sectrac) * fdblk / DEV_BSIZE;
2176
2177         bp->b_bcount = sizeof(struct fd_idfield_data) * finfo->fd_formb_nsecs;
2178         bp->b_data = (caddr_t)finfo;
2179
2180         /* now do the format */
2181         bp->b_dev = dev;
2182         BUF_STRATEGY(bp, 0);
2183
2184         /* ...and wait for it to complete */
2185         s = splbio();
2186         while(!(bp->b_flags & B_DONE)) {
2187                 rv = tsleep((caddr_t)bp, 0, "fdform", 20 * hz);
2188                 if (rv == EWOULDBLOCK)
2189                         break;
2190         }
2191         splx(s);
2192
2193         if (rv == EWOULDBLOCK) {
2194                 /* timed out */
2195                 rv = EIO;
2196                 device_unbusy(fd->dev);
2197                 biodone(bp);
2198         }
2199         if (bp->b_flags & B_ERROR)
2200                 rv = bp->b_error;
2201         /*
2202          * allow the process to be swapped
2203          */
2204         PRELE(p);
2205         BUF_UNLOCK(bp);
2206         BUF_LOCKFREE(bp);
2207         free(bp, M_TEMP);
2208         return rv;
2209 }
2210
2211 /*
2212  * TODO: don't allocate buffer on stack.
2213  */
2214
2215 static int
2216 fdioctl(dev_t dev, u_long cmd, caddr_t addr, int flag, struct thread *td)
2217 {
2218         fdu_t   fdu = FDUNIT(minor(dev));
2219         fd_p    fd = devclass_get_softc(fd_devclass, fdu);
2220         size_t fdblk;
2221
2222         struct fd_type *fdt;
2223         struct disklabel *dl;
2224         struct fdc_status *fsp;
2225         char buffer[DEV_BSIZE];
2226         int error = 0;
2227
2228         fdblk = 128 << fd->ft->secsize;
2229
2230         switch (cmd) {
2231         case DIOCGDINFO:
2232                 bzero(buffer, sizeof (buffer));
2233                 dl = (struct disklabel *)buffer;
2234                 dl->d_secsize = fdblk;
2235                 fdt = fd->ft;
2236                 dl->d_secpercyl = fdt->size / fdt->tracks;
2237                 dl->d_type = DTYPE_FLOPPY;
2238
2239                 if (readdisklabel(dev, dl)
2240                     == NULL)
2241                         error = 0;
2242                 else
2243                         error = EINVAL;
2244
2245                 *(struct disklabel *)addr = *dl;
2246                 break;
2247
2248         case DIOCSDINFO:
2249                 if ((flag & FWRITE) == 0)
2250                         error = EBADF;
2251                 break;
2252
2253         case DIOCWLABEL:
2254                 if ((flag & FWRITE) == 0)
2255                         error = EBADF;
2256                 break;
2257
2258         case DIOCWDINFO:
2259                 if ((flag & FWRITE) == 0) {
2260                         error = EBADF;
2261                         break;
2262                 }
2263
2264                 dl = (struct disklabel *)addr;
2265
2266                 if ((error = setdisklabel((struct disklabel *)buffer, dl,
2267                                           (u_long)0)) != 0)
2268                         break;
2269
2270                 error = writedisklabel(dev, (struct disklabel *)buffer);
2271                 break;
2272         case FD_FORM:
2273                 if ((flag & FWRITE) == 0)
2274                         error = EBADF;  /* must be opened for writing */
2275                 else if (((struct fd_formb *)addr)->format_version !=
2276                         FD_FORMAT_VERSION)
2277                         error = EINVAL; /* wrong version of formatting prog */
2278                 else
2279                         error = fdformat(dev, (struct fd_formb *)addr, td);
2280                 break;
2281
2282         case FD_GTYPE:                  /* get drive type */
2283                 *(struct fd_type *)addr = *fd->ft;
2284                 break;
2285
2286         case FD_STYPE:                  /* set drive type */
2287                 /* this is considered harmful; only allow for superuser */
2288                 if (suser(td) != 0)
2289                         return EPERM;
2290                 *fd->ft = *(struct fd_type *)addr;
2291                 break;
2292
2293         case FD_GOPTS:                  /* get drive options */
2294                 *(int *)addr = fd->options;
2295                 break;
2296
2297         case FD_SOPTS:                  /* set drive options */
2298                 fd->options = *(int *)addr;
2299                 break;
2300
2301         case FD_GSTAT:
2302                 fsp = (struct fdc_status *)addr;
2303                 if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
2304                         return EINVAL;
2305                 memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
2306                 break;
2307
2308         default:
2309                 error = ENOTTY;
2310                 break;
2311         }
2312         return (error);
2313 }
2314
2315 /*
2316  * Hello emacs, these are the
2317  * Local Variables:
2318  *  c-indent-level:               8
2319  *  c-continued-statement-offset: 8
2320  *  c-continued-brace-offset:     0
2321  *  c-brace-offset:              -8
2322  *  c-brace-imaginary-offset:     0
2323  *  c-argdecl-indent:             8
2324  *  c-label-offset:              -8
2325  *  c++-hanging-braces:           1
2326  *  c++-access-specifier-offset: -8
2327  *  c++-empty-arglist-indent:     8
2328  *  c++-friend-offset:            0
2329  * End:
2330  */