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1f97b64cbb
freebsd-skq/sys/dev/fdc/fdc.c
Joerg Wunsch 1f97b64cbb Do not use "Enable Implied Seek" on enhanced floppy controllers. This 
breaks the "2step" feature of the driver, e.g. in order to read 360
KiB media on a 1200 KiB drive.

As the only potential advantage of implied (vs. explicit) seeks is to
minimize the software effort, yet our driver always contained the
logic needed for explicit seeks, simply dropping implied seeks is the
best solution without introducing risks for new bugs.  There is no
performance penalty, reading a 1440 KiB medium takes exactly the same
time with both, implied or explicit seeks.

MFC after:	1 week
2013-08-24 21:04:54 +00:00

2075 lines
48 KiB
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Raw Blame History

/*-
* Copyright (c) 2004 Poul-Henning Kamp
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Don Ahn.
*
* Libretto PCMCIA floppy support by David Horwitt (dhorwitt@ucsd.edu)
* aided by the Linux floppy driver modifications from David Bateman
* (dbateman@eng.uts.edu.au).
*
* Copyright (c) 1993, 1994 by
* jc@irbs.UUCP (John Capo)
* vak@zebub.msk.su (Serge Vakulenko)
* ache@astral.msk.su (Andrew A. Chernov)
*
* Copyright (c) 1993, 1994, 1995 by
* joerg_wunsch@uriah.sax.de (Joerg Wunsch)
* dufault@hda.com (Peter Dufault)
*
* Copyright (c) 2001 Joerg Wunsch,
* joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)fd.c 7.4 (Berkeley) 5/25/91
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_fdc.h"
#include <sys/param.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/devicestat.h>
#include <sys/disk.h>
#include <sys/fcntl.h>
#include <sys/fdcio.h>
#include <sys/filio.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/rman.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <geom/geom.h>
#include <machine/bus.h>
#include <machine/clock.h>
#include <machine/stdarg.h>
#include <isa/isavar.h>
#include <isa/isareg.h>
#include <dev/fdc/fdcvar.h>
#include <isa/rtc.h>
#include <dev/ic/nec765.h>
/*
* Runtime configuration hints/flags
*/
/* configuration flags for fd */
#define FD_TYPEMASK 0x0f /* drive type, matches enum
* fd_drivetype; on i386 machines, if
* given as 0, use RTC type for fd0
* and fd1 */
#define FD_NO_CHLINE 0x10 /* drive does not support changeline
* aka. unit attention */
#define FD_NO_PROBE 0x20 /* don't probe drive (seek test), just
* assume it is there */
/*
* Things that could conceiveably considered parameters or tweakables
*/
/*
* Maximal number of bytes in a cylinder.
* This is used for ISADMA bouncebuffer allocation and sets the max
* xfersize we support.
*
* 2.88M format has 2 x 36 x 512, allow for hacked up density.
*/
#define MAX_BYTES_PER_CYL (2 * 40 * 512)
/*
* Timeout value for the PIO loops to wait until the FDC main status
* register matches our expectations (request for master, direction
* bit). This is supposed to be a number of microseconds, although
* timing might actually not be very accurate.
*
* Timeouts of 100 msec are believed to be required for some broken
* (old) hardware.
*/
#define FDSTS_TIMEOUT 100000
/*
* After this many errors, stop whining. Close will reset this count.
*/
#define FDC_ERRMAX 100
/*
* AutoDensity search lists for each drive type.
*/
static struct fd_type fd_searchlist_360k[] = {
{ FDF_5_360 },
{ 0 }
};
static struct fd_type fd_searchlist_12m[] = {
{ FDF_5_1200 | FL_AUTO },
{ FDF_5_360 | FL_2STEP | FL_AUTO},
{ 0 }
};
static struct fd_type fd_searchlist_720k[] = {
{ FDF_3_720 },
{ 0 }
};
static struct fd_type fd_searchlist_144m[] = {
{ FDF_3_1440 | FL_AUTO},
{ FDF_3_720 | FL_AUTO},
{ 0 }
};
static struct fd_type fd_searchlist_288m[] = {
{ FDF_3_1440 | FL_AUTO },
#if 0
{ FDF_3_2880 | FL_AUTO }, /* XXX: probably doesn't work */
#endif
{ FDF_3_720 | FL_AUTO},
{ 0 }
};
/*
* Order must match enum fd_drivetype in <sys/fdcio.h>.
*/
static struct fd_type *fd_native_types[] = {
NULL, /* FDT_NONE */
fd_searchlist_360k, /* FDT_360K */
fd_searchlist_12m, /* FDT_12M */
fd_searchlist_720k, /* FDT_720K */
fd_searchlist_144m, /* FDT_144M */
fd_searchlist_288m, /* FDT_288M_1 (mapped to FDT_288M) */
fd_searchlist_288m, /* FDT_288M */
};
/*
* Internals start here
*/
/* registers */
#define FDOUT 2 /* Digital Output Register (W) */
#define FDO_FDSEL 0x03 /* floppy device select */
#define FDO_FRST 0x04 /* floppy controller reset */
#define FDO_FDMAEN 0x08 /* enable floppy DMA and Interrupt */
#define FDO_MOEN0 0x10 /* motor enable drive 0 */
#define FDO_MOEN1 0x20 /* motor enable drive 1 */
#define FDO_MOEN2 0x40 /* motor enable drive 2 */
#define FDO_MOEN3 0x80 /* motor enable drive 3 */
#define FDSTS 4 /* NEC 765 Main Status Register (R) */
#define FDDSR 4 /* Data Rate Select Register (W) */
#define FDDATA 5 /* NEC 765 Data Register (R/W) */
#define FDCTL 7 /* Control Register (W) */
/*
* The YE-DATA PC Card floppies use PIO to read in the data rather
* than DMA due to the wild variability of DMA for the PC Card
* devices. DMA was deleted from the PC Card specification in version
* 7.2 of the standard, but that post-dates the YE-DATA devices by many
* years.
*
* In addition, if we cannot setup the DMA resources for the ISA
* attachment, we'll use this same offset for data transfer. However,
* that almost certainly won't work.
*
* For this mode, offset 0 and 1 must be used to setup the transfer
* for this floppy. This is OK for PC Card YE Data devices, but for
* ISA this is likely wrong. These registers are only available on
* those systems that map them to the floppy drive. Newer systems do
* not do this, and we should likely prohibit access to them (or
* disallow NODMA to be set).
*/
#define FDBCDR 0 /* And 1 */
#define FD_YE_DATAPORT 6 /* Drive Data port */
#define FDI_DCHG 0x80 /* diskette has been changed */
/* requires drive and motor being selected */
/* is cleared by any step pulse to drive */
/*
* We have three private BIO commands.
*/
#define BIO_PROBE BIO_CMD0
#define BIO_RDID BIO_CMD1
#define BIO_FMT BIO_CMD2
/*
* Per drive structure (softc).
*/
struct fd_data {
u_char *fd_ioptr; /* IO pointer */
u_int fd_iosize; /* Size of IO chunks */
u_int fd_iocount; /* Outstanding requests */
struct fdc_data *fdc; /* pointer to controller structure */
int fdsu; /* this units number on this controller */
enum fd_drivetype type; /* drive type */
struct fd_type *ft; /* pointer to current type descriptor */
struct fd_type fts; /* type descriptors */
int sectorsize;
int flags;
#define FD_WP (1<<0) /* Write protected */
#define FD_MOTOR (1<<1) /* motor should be on */
#define FD_MOTORWAIT (1<<2) /* motor should be on */
#define FD_EMPTY (1<<3) /* no media */
#define FD_NEWDISK (1<<4) /* media changed */
#define FD_ISADMA (1<<5) /* isa dma started */
int track; /* where we think the head is */
#define FD_NO_TRACK -2
int options; /* FDOPT_* */
struct callout toffhandle;
struct g_geom *fd_geom;
struct g_provider *fd_provider;
device_t dev;
struct bio_queue_head fd_bq;
};
#define FD_NOT_VALID -2
static driver_intr_t fdc_intr;
static driver_filter_t fdc_intr_fast;
static void fdc_reset(struct fdc_data *);
static int fd_probe_disk(struct fd_data *, int *);
static SYSCTL_NODE(_debug, OID_AUTO, fdc, CTLFLAG_RW, 0, "fdc driver");
static int fifo_threshold = 8;
SYSCTL_INT(_debug_fdc, OID_AUTO, fifo, CTLFLAG_RW, &fifo_threshold, 0,
"FIFO threshold setting");
static int debugflags = 0;
SYSCTL_INT(_debug_fdc, OID_AUTO, debugflags, CTLFLAG_RW, &debugflags, 0,
"Debug flags");
static int retries = 10;
SYSCTL_INT(_debug_fdc, OID_AUTO, retries, CTLFLAG_RW, &retries, 0,
"Number of retries to attempt");
static int spec1 = 0xaf;
SYSCTL_INT(_debug_fdc, OID_AUTO, spec1, CTLFLAG_RW, &spec1, 0,
"Specification byte one (step-rate + head unload)");
static int spec2 = 0x10;
SYSCTL_INT(_debug_fdc, OID_AUTO, spec2, CTLFLAG_RW, &spec2, 0,
"Specification byte two (head load time + no-dma)");
static int settle;
SYSCTL_INT(_debug_fdc, OID_AUTO, settle, CTLFLAG_RW, &settle, 0,
"Head settling time in sec/hz");
static void
fdprinttype(struct fd_type *ft)
{
printf("(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,0x%x)",
ft->sectrac, ft->secsize, ft->datalen, ft->gap, ft->tracks,
ft->size, ft->trans, ft->heads, ft->f_gap, ft->f_inter,
ft->offset_side2, ft->flags);
}
static void
fdsettype(struct fd_data *fd, struct fd_type *ft)
{
fd->ft = ft;
ft->size = ft->sectrac * ft->heads * ft->tracks;
fd->sectorsize = 128 << fd->ft->secsize;
}
/*
* Bus space handling (access to low-level IO).
*/
static inline void
fdregwr(struct fdc_data *fdc, int reg, uint8_t v)
{
bus_space_write_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg], v);
}
static inline uint8_t
fdregrd(struct fdc_data *fdc, int reg)
{
return bus_space_read_1(fdc->iot, fdc->ioh[reg], fdc->ioff[reg]);
}
static void
fdctl_wr(struct fdc_data *fdc, u_int8_t v)
{
fdregwr(fdc, FDCTL, v);
}
static void
fdout_wr(struct fdc_data *fdc, u_int8_t v)
{
fdregwr(fdc, FDOUT, v);
}
static u_int8_t
fdsts_rd(struct fdc_data *fdc)
{
return fdregrd(fdc, FDSTS);
}
static void
fddsr_wr(struct fdc_data *fdc, u_int8_t v)
{
fdregwr(fdc, FDDSR, v);
}
static void
fddata_wr(struct fdc_data *fdc, u_int8_t v)
{
fdregwr(fdc, FDDATA, v);
}
static u_int8_t
fddata_rd(struct fdc_data *fdc)
{
return fdregrd(fdc, FDDATA);
}
static u_int8_t
fdin_rd(struct fdc_data *fdc)
{
return fdregrd(fdc, FDCTL);
}
/*
* Magic pseudo-DMA initialization for YE FDC. Sets count and
* direction.
*/
static void
fdbcdr_wr(struct fdc_data *fdc, int iswrite, uint16_t count)
{
fdregwr(fdc, FDBCDR, (count - 1) & 0xff);
fdregwr(fdc, FDBCDR + 1,
(iswrite ? 0x80 : 0) | (((count - 1) >> 8) & 0x7f));
}
static int
fdc_err(struct fdc_data *fdc, const char *s)
{
fdc->fdc_errs++;
if (s) {
if (fdc->fdc_errs < FDC_ERRMAX)
device_printf(fdc->fdc_dev, "%s", s);
else if (fdc->fdc_errs == FDC_ERRMAX)
device_printf(fdc->fdc_dev, "too many errors, not "
"logging any more\n");
}
return (1);
}
/*
* FDC IO functions, take care of the main status register, timeout
* in case the desired status bits are never set.
*
* These PIO loops initially start out with short delays between
* each iteration in the expectation that the required condition
* is usually met quickly, so it can be handled immediately.
*/
static int
fdc_in(struct fdc_data *fdc, int *ptr)
{
int i, j, step;
step = 1;
for (j = 0; j < FDSTS_TIMEOUT; j += step) {
i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
if (i == (NE7_DIO|NE7_RQM)) {
i = fddata_rd(fdc);
if (ptr)
*ptr = i;
return (0);
}
if (i == NE7_RQM)
return (fdc_err(fdc, "ready for output in input\n"));
step += step;
DELAY(step);
}
return (fdc_err(fdc, bootverbose? "input ready timeout\n": 0));
}
static int
fdc_out(struct fdc_data *fdc, int x)
{
int i, j, step;
step = 1;
for (j = 0; j < FDSTS_TIMEOUT; j += step) {
i = fdsts_rd(fdc) & (NE7_DIO | NE7_RQM);
if (i == NE7_RQM) {
fddata_wr(fdc, x);
return (0);
}
if (i == (NE7_DIO|NE7_RQM))
return (fdc_err(fdc, "ready for input in output\n"));
step += step;
DELAY(step);
}
return (fdc_err(fdc, bootverbose? "output ready timeout\n": 0));
}
/*
* fdc_cmd: Send a command to the chip.
* Takes a varargs with this structure:
* # of output bytes
* output bytes as int [...]
* # of input bytes
* input bytes as int* [...]
*/
static int
fdc_cmd(struct fdc_data *fdc, int n_out, ...)
{
u_char cmd = 0;
int n_in;
int n, i;
va_list ap;
va_start(ap, n_out);
for (n = 0; n < n_out; n++) {
i = va_arg(ap, int);
if (n == 0)
cmd = i;
if (fdc_out(fdc, i) < 0) {
char msg[50];
snprintf(msg, sizeof(msg),
"cmd %x failed at out byte %d of %d\n",
cmd, n + 1, n_out);
fdc->flags |= FDC_NEEDS_RESET;
va_end(ap);
return fdc_err(fdc, msg);
}
}
n_in = va_arg(ap, int);
for (n = 0; n < n_in; n++) {
int *ptr = va_arg(ap, int *);
if (fdc_in(fdc, ptr) < 0) {
char msg[50];
snprintf(msg, sizeof(msg),
"cmd %02x failed at in byte %d of %d\n",
cmd, n + 1, n_in);
fdc->flags |= FDC_NEEDS_RESET;
va_end(ap);
return fdc_err(fdc, msg);
}
}
va_end(ap);
return (0);
}
static void
fdc_reset(struct fdc_data *fdc)
{
int i, r[10];
if (fdc->fdct == FDC_ENHANCED) {
/* Try a software reset, default precomp, and 500 kb/s */
fddsr_wr(fdc, I8207X_DSR_SR);
} else {
/* Try a hardware reset, keep motor on */
fdout_wr(fdc, fdc->fdout & ~(FDO_FRST|FDO_FDMAEN));
DELAY(100);
/* enable FDC, but defer interrupts a moment */
fdout_wr(fdc, fdc->fdout & ~FDO_FDMAEN);
}
DELAY(100);
fdout_wr(fdc, fdc->fdout);
/* XXX after a reset, silently believe the FDC will accept commands */
if (fdc_cmd(fdc, 3, NE7CMD_SPECIFY, spec1, spec2, 0))
device_printf(fdc->fdc_dev, " SPECIFY failed in reset\n");
if (fdc->fdct == FDC_ENHANCED) {
if (fdc_cmd(fdc, 4,
I8207X_CONFIG,
0,
/* 0x40 | */ /* Enable Implied Seek -
* breaks 2step! */
0x10 | /* Polling disabled */
(fifo_threshold - 1), /* Fifo threshold */
0x00, /* Precomp track */
0))
device_printf(fdc->fdc_dev,
" CONFIGURE failed in reset\n");
if (debugflags & 1) {
if (fdc_cmd(fdc, 1,
I8207X_DUMPREG,
10, &r[0], &r[1], &r[2], &r[3], &r[4],
&r[5], &r[6], &r[7], &r[8], &r[9]))
device_printf(fdc->fdc_dev,
" DUMPREG failed in reset\n");
for (i = 0; i < 10; i++)
printf(" %02x", r[i]);
printf("\n");
}
}
}
static int
fdc_sense_drive(struct fdc_data *fdc, int *st3p)
{
int st3;
if (fdc_cmd(fdc, 2, NE7CMD_SENSED, fdc->fd->fdsu, 1, &st3))
return (fdc_err(fdc, "Sense Drive Status failed\n"));
if (st3p)
*st3p = st3;
return (0);
}
static int
fdc_sense_int(struct fdc_data *fdc, int *st0p, int *cylp)
{
int cyl, st0, ret;
ret = fdc_cmd(fdc, 1, NE7CMD_SENSEI, 1, &st0);
if (ret) {
(void)fdc_err(fdc, "sense intr err reading stat reg 0\n");
return (ret);
}
if (st0p)
*st0p = st0;
if ((st0 & NE7_ST0_IC) == NE7_ST0_IC_IV) {
/*
* There doesn't seem to have been an interrupt.
*/
return (FD_NOT_VALID);
}
if (fdc_in(fdc, &cyl) < 0)
return fdc_err(fdc, "can't get cyl num\n");
if (cylp)
*cylp = cyl;
return (0);
}
static int
fdc_read_status(struct fdc_data *fdc)
{
int i, ret, status;
for (i = ret = 0; i < 7; i++) {
ret = fdc_in(fdc, &status);
fdc->status[i] = status;
if (ret != 0)
break;
}
if (ret == 0)
fdc->flags |= FDC_STAT_VALID;
else
fdc->flags &= ~FDC_STAT_VALID;
return ret;
}
/*
* Select this drive
*/
static void
fd_select(struct fd_data *fd)
{
struct fdc_data *fdc;
/* XXX: lock controller */
fdc = fd->fdc;
fdc->fdout &= ~FDO_FDSEL;
fdc->fdout |= FDO_FDMAEN | FDO_FRST | fd->fdsu;
fdout_wr(fdc, fdc->fdout);
}
static void
fd_turnon(void *arg)
{
struct fd_data *fd;
struct bio *bp;
int once;
fd = arg;
mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
fd->flags &= ~FD_MOTORWAIT;
fd->flags |= FD_MOTOR;
once = 0;
for (;;) {
bp = bioq_takefirst(&fd->fd_bq);
if (bp == NULL)
break;
bioq_disksort(&fd->fdc->head, bp);
once = 1;
}
if (once)
wakeup(&fd->fdc->head);
}
static void
fd_motor(struct fd_data *fd, int turnon)
{
struct fdc_data *fdc;
fdc = fd->fdc;
/*
mtx_assert(&fdc->fdc_mtx, MA_OWNED);
*/
if (turnon) {
fd->flags |= FD_MOTORWAIT;
fdc->fdout |= (FDO_MOEN0 << fd->fdsu);
callout_reset(&fd->toffhandle, hz, fd_turnon, fd);
} else {
callout_stop(&fd->toffhandle);
fd->flags &= ~(FD_MOTOR|FD_MOTORWAIT);
fdc->fdout &= ~(FDO_MOEN0 << fd->fdsu);
}
fdout_wr(fdc, fdc->fdout);
}
static void
fd_turnoff(void *xfd)
{
struct fd_data *fd = xfd;
mtx_assert(&fd->fdc->fdc_mtx, MA_OWNED);
fd_motor(fd, 0);
}
/*
* fdc_intr - wake up the worker thread.
*/
static void
fdc_intr(void *arg)
{
wakeup(arg);
}
static int
fdc_intr_fast(void *arg)
{
wakeup(arg);
return(FILTER_HANDLED);
}
/*
* fdc_pio(): perform programmed IO read/write for YE PCMCIA floppy.
*/
static void
fdc_pio(struct fdc_data *fdc)
{
u_char *cptr;
struct bio *bp;
u_int count;
bp = fdc->bp;
cptr = fdc->fd->fd_ioptr;
count = fdc->fd->fd_iosize;
if (bp->bio_cmd == BIO_READ) {
fdbcdr_wr(fdc, 0, count);
bus_space_read_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
fdc->ioff[FD_YE_DATAPORT], cptr, count);
} else {
bus_space_write_multi_1(fdc->iot, fdc->ioh[FD_YE_DATAPORT],
fdc->ioff[FD_YE_DATAPORT], cptr, count);
fdbcdr_wr(fdc, 0, count); /* needed? */
}
}
static int
fdc_biodone(struct fdc_data *fdc, int error)
{
struct fd_data *fd;
struct bio *bp;
fd = fdc->fd;
bp = fdc->bp;
mtx_lock(&fdc->fdc_mtx);
if (--fd->fd_iocount == 0)
callout_reset(&fd->toffhandle, 4 * hz, fd_turnoff, fd);
fdc->bp = NULL;
fdc->fd = NULL;
mtx_unlock(&fdc->fdc_mtx);
if (bp->bio_to != NULL) {
if ((debugflags & 2) && fd->fdc->retry > 0)
printf("retries: %d\n", fd->fdc->retry);
g_io_deliver(bp, error);
return (0);
}
bp->bio_error = error;
bp->bio_flags |= BIO_DONE;
wakeup(bp);
return (0);
}
static int retry_line;
static int
fdc_worker(struct fdc_data *fdc)
{
struct fd_data *fd;
struct bio *bp;
int i, nsect;
int st0, st3, cyl, mfm, steptrac, cylinder, descyl, sec;
int head;
static int need_recal;
struct fdc_readid *idp;
struct fd_formb *finfo;
/* Have we exhausted our retries ? */
bp = fdc->bp;
fd = fdc->fd;
if (bp != NULL &&
(fdc->retry >= retries || (fd->options & FDOPT_NORETRY))) {
if ((debugflags & 4))
printf("Too many retries (EIO)\n");
if (fdc->flags & FDC_NEEDS_RESET) {
mtx_lock(&fdc->fdc_mtx);
fd->flags |= FD_EMPTY;
mtx_unlock(&fdc->fdc_mtx);
}
return (fdc_biodone(fdc, EIO));
}
/* Disable ISADMA if we bailed while it was active */
if (fd != NULL && (fd->flags & FD_ISADMA)) {
isa_dmadone(
bp->bio_cmd & BIO_READ ? ISADMA_READ : ISADMA_WRITE,
fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
mtx_lock(&fdc->fdc_mtx);
fd->flags &= ~FD_ISADMA;
mtx_unlock(&fdc->fdc_mtx);
}
/* Unwedge the controller ? */
if (fdc->flags & FDC_NEEDS_RESET) {
fdc->flags &= ~FDC_NEEDS_RESET;
fdc_reset(fdc);
tsleep(fdc, PRIBIO, "fdcrst", hz);
/* Discard results */
for (i = 0; i < 4; i++)
fdc_sense_int(fdc, &st0, &cyl);
/* All drives must recal */
need_recal = 0xf;
}
/* Pick up a request, if need be wait for it */
if (fdc->bp == NULL) {
mtx_lock(&fdc->fdc_mtx);
do {
fdc->bp = bioq_takefirst(&fdc->head);
if (fdc->bp == NULL)
msleep(&fdc->head, &fdc->fdc_mtx,
PRIBIO, "-", hz);
} while (fdc->bp == NULL &&
(fdc->flags & FDC_KTHREAD_EXIT) == 0);
mtx_unlock(&fdc->fdc_mtx);
if (fdc->bp == NULL)
/*
* Nothing to do, worker thread has been
* requested to stop.
*/
return (0);
bp = fdc->bp;
fd = fdc->fd = bp->bio_driver1;
fdc->retry = 0;
fd->fd_ioptr = bp->bio_data;
if (bp->bio_cmd & BIO_FMT) {
i = offsetof(struct fd_formb, fd_formb_cylno(0));
fd->fd_ioptr += i;
fd->fd_iosize = bp->bio_length - i;
}
}
/* Select drive, setup params */
fd_select(fd);
if (fdc->fdct == FDC_ENHANCED)
fddsr_wr(fdc, fd->ft->trans);
else
fdctl_wr(fdc, fd->ft->trans);
if (bp->bio_cmd & BIO_PROBE) {
if ((!(device_get_flags(fd->dev) & FD_NO_CHLINE) &&
!(fdin_rd(fdc) & FDI_DCHG) &&
!(fd->flags & FD_EMPTY)) ||
fd_probe_disk(fd, &need_recal) == 0)
return (fdc_biodone(fdc, 0));
return (1);
}
/*
* If we are dead just flush the requests
*/
if (fd->flags & FD_EMPTY)
return (fdc_biodone(fdc, ENXIO));
/* Check if we lost our media */
if (fdin_rd(fdc) & FDI_DCHG) {
if (debugflags & 0x40)
printf("Lost disk\n");
mtx_lock(&fdc->fdc_mtx);
fd->flags |= FD_EMPTY;
fd->flags |= FD_NEWDISK;
mtx_unlock(&fdc->fdc_mtx);
g_topology_lock();
g_orphan_provider(fd->fd_provider, ENXIO);
fd->fd_provider->flags |= G_PF_WITHER;
fd->fd_provider =
g_new_providerf(fd->fd_geom, "%s", fd->fd_geom->name);
g_error_provider(fd->fd_provider, 0);
g_topology_unlock();
return (fdc_biodone(fdc, ENXIO));
}
/* Check if the floppy is write-protected */
if(bp->bio_cmd & (BIO_FMT | BIO_WRITE)) {
retry_line = __LINE__;
if(fdc_sense_drive(fdc, &st3) != 0)
return (1);
if(st3 & NE7_ST3_WP)
return (fdc_biodone(fdc, EROFS));
}
mfm = (fd->ft->flags & FL_MFM)? NE7CMD_MFM: 0;
steptrac = (fd->ft->flags & FL_2STEP)? 2: 1;
i = fd->ft->sectrac * fd->ft->heads;
cylinder = bp->bio_pblkno / i;
descyl = cylinder * steptrac;
sec = bp->bio_pblkno % i;
nsect = i - sec;
head = sec / fd->ft->sectrac;
sec = sec % fd->ft->sectrac + 1;
/* If everything is going swimmingly, use multisector xfer */
if (fdc->retry == 0 && bp->bio_cmd & (BIO_READ|BIO_WRITE)) {
fd->fd_iosize = imin(nsect * fd->sectorsize, bp->bio_resid);
nsect = fd->fd_iosize / fd->sectorsize;
} else if (bp->bio_cmd & (BIO_READ|BIO_WRITE)) {
fd->fd_iosize = fd->sectorsize;
nsect = 1;
}
/* Do RECAL if we need to or are going to track zero anyway */
if ((need_recal & (1 << fd->fdsu)) ||
(cylinder == 0 && fd->track != 0) ||
fdc->retry > 2) {
retry_line = __LINE__;
if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
return (1);
tsleep(fdc, PRIBIO, "fdrecal", hz);
retry_line = __LINE__;
if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
return (1); /* XXX */
retry_line = __LINE__;
if ((st0 & 0xc0) || cyl != 0)
return (1);
need_recal &= ~(1 << fd->fdsu);
fd->track = 0;
/* let the heads settle */
if (settle)
tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
}
/*
* SEEK to where we want to be
*/
if (cylinder != fd->track) {
retry_line = __LINE__;
if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, descyl, 0))
return (1);
tsleep(fdc, PRIBIO, "fdseek", hz);
retry_line = __LINE__;
if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
return (1); /* XXX */
retry_line = __LINE__;
if ((st0 & 0xc0) || cyl != descyl) {
need_recal |= (1 << fd->fdsu);
return (1);
}
/* let the heads settle */
if (settle)
tsleep(fdc->fd, PRIBIO, "fdhdstl", settle);
}
fd->track = cylinder;
if (debugflags & 8)
printf("op %x bn %ju siz %u ptr %p retry %d\n",
bp->bio_cmd, bp->bio_pblkno, fd->fd_iosize,
fd->fd_ioptr, fdc->retry);
/* Setup ISADMA if we need it and have it */
if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_FMT))
&& !(fdc->flags & FDC_NODMA)) {
isa_dmastart(
bp->bio_cmd & BIO_READ ? ISADMA_READ : ISADMA_WRITE,
fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
mtx_lock(&fdc->fdc_mtx);
fd->flags |= FD_ISADMA;
mtx_unlock(&fdc->fdc_mtx);
}
/* Do PIO if we have to */
if (fdc->flags & FDC_NODMA) {
if (bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_FMT))
fdbcdr_wr(fdc, 1, fd->fd_iosize);
if (bp->bio_cmd & (BIO_WRITE|BIO_FMT))
fdc_pio(fdc);
}
switch(bp->bio_cmd) {
case BIO_FMT:
/* formatting */
finfo = (struct fd_formb *)bp->bio_data;
retry_line = __LINE__;
if (fdc_cmd(fdc, 6,
NE7CMD_FORMAT | mfm,
head << 2 | fd->fdsu,
finfo->fd_formb_secshift,
finfo->fd_formb_nsecs,
finfo->fd_formb_gaplen,
finfo->fd_formb_fillbyte, 0))
return (1);
break;
case BIO_RDID:
retry_line = __LINE__;
if (fdc_cmd(fdc, 2,
NE7CMD_READID | mfm,
head << 2 | fd->fdsu, 0))
return (1);
break;
case BIO_READ:
retry_line = __LINE__;
if (fdc_cmd(fdc, 9,
NE7CMD_READ | NE7CMD_SK | mfm | NE7CMD_MT,
head << 2 | fd->fdsu, /* head & unit */
fd->track, /* track */
head, /* head */
sec, /* sector + 1 */
fd->ft->secsize, /* sector size */
fd->ft->sectrac, /* sectors/track */
fd->ft->gap, /* gap size */
fd->ft->datalen, /* data length */
0))
return (1);
break;
case BIO_WRITE:
retry_line = __LINE__;
if (fdc_cmd(fdc, 9,
NE7CMD_WRITE | mfm | NE7CMD_MT,
head << 2 | fd->fdsu, /* head & unit */
fd->track, /* track */
head, /* head */
sec, /* sector + 1 */
fd->ft->secsize, /* sector size */
fd->ft->sectrac, /* sectors/track */
fd->ft->gap, /* gap size */
fd->ft->datalen, /* data length */
0))
return (1);
break;
default:
KASSERT(0 == 1, ("Wrong bio_cmd %x\n", bp->bio_cmd));
}
/* Wait for interrupt */
i = tsleep(fdc, PRIBIO, "fddata", hz);
/* PIO if the read looks good */
if (i == 0 && (fdc->flags & FDC_NODMA) && (bp->bio_cmd & BIO_READ))
fdc_pio(fdc);
/* Finish DMA */
if (fd->flags & FD_ISADMA) {
isa_dmadone(
bp->bio_cmd & BIO_READ ? ISADMA_READ : ISADMA_WRITE,
fd->fd_ioptr, fd->fd_iosize, fdc->dmachan);
mtx_lock(&fdc->fdc_mtx);
fd->flags &= ~FD_ISADMA;
mtx_unlock(&fdc->fdc_mtx);
}
if (i != 0) {
/*
* Timeout.
*
* Due to IBM's brain-dead design, the FDC has a faked ready
* signal, hardwired to ready == true. Thus, any command
* issued if there's no diskette in the drive will _never_
* complete, and must be aborted by resetting the FDC.
* Many thanks, Big Blue!
*/
retry_line = __LINE__;
fdc->flags |= FDC_NEEDS_RESET;
return (1);
}
retry_line = __LINE__;
if (fdc_read_status(fdc))
return (1);
if (debugflags & 0x10)
printf(" -> %x %x %x %x\n",
fdc->status[0], fdc->status[1],
fdc->status[2], fdc->status[3]);
st0 = fdc->status[0] & NE7_ST0_IC;
if (st0 != 0) {
retry_line = __LINE__;
if (st0 == NE7_ST0_IC_AT && fdc->status[1] & NE7_ST1_OR) {
/*
* DMA overrun. Someone hogged the bus and
* didn't release it in time for the next
* FDC transfer.
*/
return (1);
}
retry_line = __LINE__;
if(st0 == NE7_ST0_IC_IV) {
fdc->flags |= FDC_NEEDS_RESET;
return (1);
}
retry_line = __LINE__;
if(st0 == NE7_ST0_IC_AT && fdc->status[2] & NE7_ST2_WC) {
need_recal |= (1 << fd->fdsu);
return (1);
}
if (debugflags & 0x20) {
printf("status %02x %02x %02x %02x %02x %02x\n",
fdc->status[0], fdc->status[1], fdc->status[2],
fdc->status[3], fdc->status[4], fdc->status[5]);
}
retry_line = __LINE__;
return (1);
}
/* All OK */
switch(bp->bio_cmd) {
case BIO_RDID:
/* copy out ID field contents */
idp = (struct fdc_readid *)bp->bio_data;
idp->cyl = fdc->status[3];
idp->head = fdc->status[4];
idp->sec = fdc->status[5];
idp->secshift = fdc->status[6];
if (debugflags & 0x40)
printf("c %d h %d s %d z %d\n",
idp->cyl, idp->head, idp->sec, idp->secshift);
break;
case BIO_READ:
case BIO_WRITE:
bp->bio_pblkno += nsect;
bp->bio_resid -= fd->fd_iosize;
bp->bio_completed += fd->fd_iosize;
fd->fd_ioptr += fd->fd_iosize;
/* Since we managed to get something done, reset the retry */
fdc->retry = 0;
if (bp->bio_resid > 0)
return (0);
break;
case BIO_FMT:
break;
}
return (fdc_biodone(fdc, 0));
}
static void
fdc_thread(void *arg)
{
struct fdc_data *fdc;
fdc = arg;
int i;
mtx_lock(&fdc->fdc_mtx);
fdc->flags |= FDC_KTHREAD_ALIVE;
while ((fdc->flags & FDC_KTHREAD_EXIT) == 0) {
mtx_unlock(&fdc->fdc_mtx);
i = fdc_worker(fdc);
if (i && debugflags & 0x20) {
if (fdc->bp != NULL) {
g_print_bio(fdc->bp);
printf("\n");
}
printf("Retry line %d\n", retry_line);
}
fdc->retry += i;
mtx_lock(&fdc->fdc_mtx);
}
fdc->flags &= ~(FDC_KTHREAD_EXIT | FDC_KTHREAD_ALIVE);
mtx_unlock(&fdc->fdc_mtx);
kproc_exit(0);
}
/*
* Enqueue a request.
*/
static void
fd_enqueue(struct fd_data *fd, struct bio *bp)
{
struct fdc_data *fdc;
int call;
call = 0;
fdc = fd->fdc;
mtx_lock(&fdc->fdc_mtx);
/* If we go from idle, cancel motor turnoff */
if (fd->fd_iocount++ == 0)
callout_stop(&fd->toffhandle);
if (fd->flags & FD_MOTOR) {
/* The motor is on, send it directly to the controller */
bioq_disksort(&fdc->head, bp);
wakeup(&fdc->head);
} else {
/* Queue it on the drive until the motor has started */
bioq_insert_tail(&fd->fd_bq, bp);
if (!(fd->flags & FD_MOTORWAIT))
fd_motor(fd, 1);
}
mtx_unlock(&fdc->fdc_mtx);
}
/*
* Try to find out if we have a disk in the drive.
*/
static int
fd_probe_disk(struct fd_data *fd, int *recal)
{
struct fdc_data *fdc;
int st0, st3, cyl;
int oopts, ret;
fdc = fd->fdc;
oopts = fd->options;
fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
ret = 1;
/*
* First recal, then seek to cyl#1, this clears the old condition on
* the disk change line so we can examine it for current status.
*/
if (debugflags & 0x40)
printf("New disk in probe\n");
mtx_lock(&fdc->fdc_mtx);
fd->flags |= FD_NEWDISK;
mtx_unlock(&fdc->fdc_mtx);
if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fd->fdsu, 0))
goto done;
tsleep(fdc, PRIBIO, "fdrecal", hz);
if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
goto done; /* XXX */
if ((st0 & 0xc0) || cyl != 0)
goto done;
/* Seek to track 1 */
if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fd->fdsu, 1, 0))
goto done;
tsleep(fdc, PRIBIO, "fdseek", hz);
if (fdc_sense_int(fdc, &st0, &cyl) == FD_NOT_VALID)
goto done; /* XXX */
*recal |= (1 << fd->fdsu);
if (fdin_rd(fdc) & FDI_DCHG) {
if (debugflags & 0x40)
printf("Empty in probe\n");
mtx_lock(&fdc->fdc_mtx);
fd->flags |= FD_EMPTY;
mtx_unlock(&fdc->fdc_mtx);
} else {
if (fdc_sense_drive(fdc, &st3) != 0)
goto done;
if (debugflags & 0x40)
printf("Got disk in probe\n");
mtx_lock(&fdc->fdc_mtx);
fd->flags &= ~FD_EMPTY;
if (st3 & NE7_ST3_WP)
fd->flags |= FD_WP;
else
fd->flags &= ~FD_WP;
mtx_unlock(&fdc->fdc_mtx);
}
ret = 0;
done:
fd->options = oopts;
return (ret);
}
static int
fdmisccmd(struct fd_data *fd, u_int cmd, void *data)
{
struct bio *bp;
struct fd_formb *finfo;
struct fdc_readid *idfield;
int error;
bp = malloc(sizeof(struct bio), M_TEMP, M_WAITOK | M_ZERO);
/*
* Set up a bio request for fdstrategy(). bio_offset is faked
* so that fdstrategy() will seek to the requested
* cylinder, and use the desired head.
*/
bp->bio_cmd = cmd;
if (cmd == BIO_FMT) {
finfo = (struct fd_formb *)data;
bp->bio_pblkno =
(finfo->cyl * fd->ft->heads + finfo->head) *
fd->ft->sectrac;
bp->bio_length = sizeof *finfo;
} else if (cmd == BIO_RDID) {
idfield = (struct fdc_readid *)data;
bp->bio_pblkno =
(idfield->cyl * fd->ft->heads + idfield->head) *
fd->ft->sectrac;
bp->bio_length = sizeof(struct fdc_readid);
} else if (cmd == BIO_PROBE) {
/* nothing */
} else
panic("wrong cmd in fdmisccmd()");
bp->bio_offset = bp->bio_pblkno * fd->sectorsize;
bp->bio_data = data;
bp->bio_driver1 = fd;
bp->bio_flags = 0;
fd_enqueue(fd, bp);
do {
tsleep(bp, PRIBIO, "fdwait", hz);
} while (!(bp->bio_flags & BIO_DONE));
error = bp->bio_error;
free(bp, M_TEMP);
return (error);
}
/*
* Try figuring out the density of the media present in our device.
*/
static int
fdautoselect(struct fd_data *fd)
{
struct fd_type *fdtp;
struct fdc_readid id;
int oopts, rv;
if (!(fd->ft->flags & FL_AUTO))
return (0);
fdtp = fd_native_types[fd->type];
fdsettype(fd, fdtp);
if (!(fd->ft->flags & FL_AUTO))
return (0);
/*
* Try reading sector ID fields, first at cylinder 0, head 0,
* then at cylinder 2, head N. We don't probe cylinder 1,
* since for 5.25in DD media in a HD drive, there are no data
* to read (2 step pulses per media cylinder required). For
* two-sided media, the second probe always goes to head 1, so
* we can tell them apart from single-sided media. As a
* side-effect this means that single-sided media should be
* mentioned in the search list after two-sided media of an
* otherwise identical density. Media with a different number
* of sectors per track but otherwise identical parameters
* cannot be distinguished at all.
*
* If we successfully read an ID field on both cylinders where
* the recorded values match our expectation, we are done.
* Otherwise, we try the next density entry from the table.
*
* Stepping to cylinder 2 has the side-effect of clearing the
* unit attention bit.
*/
oopts = fd->options;
fd->options |= FDOPT_NOERRLOG | FDOPT_NORETRY;
for (; fdtp->heads; fdtp++) {
fdsettype(fd, fdtp);
id.cyl = id.head = 0;
rv = fdmisccmd(fd, BIO_RDID, &id);
if (rv != 0)
continue;
if (id.cyl != 0 || id.head != 0 || id.secshift != fdtp->secsize)
continue;
id.cyl = 2;
id.head = fd->ft->heads - 1;
rv = fdmisccmd(fd, BIO_RDID, &id);
if (id.cyl != 2 || id.head != fdtp->heads - 1 ||
id.secshift != fdtp->secsize)
continue;
if (rv == 0)
break;
}
fd->options = oopts;
if (fdtp->heads == 0) {
if (debugflags & 0x40)
device_printf(fd->dev, "autoselection failed\n");
fdsettype(fd, fd_native_types[fd->type]);
return (-1);
} else {
if (debugflags & 0x40) {
device_printf(fd->dev,
"autoselected %d KB medium\n", fd->ft->size / 2);
fdprinttype(fd->ft);
}
return (0);
}
}
/*
* GEOM class implementation
*/
static g_access_t fd_access;
static g_start_t fd_start;
static g_ioctl_t fd_ioctl;
struct g_class g_fd_class = {
.name = "FD",
.version = G_VERSION,
.start = fd_start,
.access = fd_access,
.ioctl = fd_ioctl,
};
static int
fd_access(struct g_provider *pp, int r, int w, int e)
{
struct fd_data *fd;
struct fdc_data *fdc;
int ar, aw, ae;
int busy;
fd = pp->geom->softc;
fdc = fd->fdc;
/*
* If our provider is withering, we can only get negative requests
* and we don't want to even see them
*/
if (pp->flags & G_PF_WITHER)
return (0);
ar = r + pp->acr;
aw = w + pp->acw;
ae = e + pp->ace;
if (ar == 0 && aw == 0 && ae == 0) {
device_unbusy(fd->dev);
return (0);
}
busy = 0;
if (pp->acr == 0 && pp->acw == 0 && pp->ace == 0) {
if (fdmisccmd(fd, BIO_PROBE, NULL))
return (ENXIO);
if (fd->flags & FD_EMPTY)
return (ENXIO);
if (fd->flags & FD_NEWDISK) {
if (fdautoselect(fd) != 0 &&
(device_get_flags(fd->dev) & FD_NO_CHLINE)) {
mtx_lock(&fdc->fdc_mtx);
fd->flags |= FD_EMPTY;
mtx_unlock(&fdc->fdc_mtx);
return (ENXIO);
}
mtx_lock(&fdc->fdc_mtx);
fd->flags &= ~FD_NEWDISK;
mtx_unlock(&fdc->fdc_mtx);
}
device_busy(fd->dev);
busy = 1;
}
if (w > 0 && (fd->flags & FD_WP)) {
if (busy)
device_unbusy(fd->dev);
return (EROFS);
}
pp->sectorsize = fd->sectorsize;
pp->stripesize = fd->ft->heads * fd->ft->sectrac * fd->sectorsize;
pp->mediasize = pp->stripesize * fd->ft->tracks;
return (0);
}
static void
fd_start(struct bio *bp)
{
struct fdc_data * fdc;
struct fd_data * fd;
fd = bp->bio_to->geom->softc;
fdc = fd->fdc;
bp->bio_driver1 = fd;
if (bp->bio_cmd & BIO_GETATTR) {
if (g_handleattr_int(bp, "GEOM::fwsectors", fd->ft->sectrac))
return;
if (g_handleattr_int(bp, "GEOM::fwheads", fd->ft->heads))
return;
g_io_deliver(bp, ENOIOCTL);
return;
}
if (!(bp->bio_cmd & (BIO_READ|BIO_WRITE))) {
g_io_deliver(bp, EOPNOTSUPP);
return;
}
bp->bio_pblkno = bp->bio_offset / fd->sectorsize;
bp->bio_resid = bp->bio_length;
fd_enqueue(fd, bp);
return;
}
static int
fd_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thread *td)
{
struct fd_data *fd;
struct fdc_status *fsp;
struct fdc_readid *rid;
int error;
fd = pp->geom->softc;
switch (cmd) {
case FD_GTYPE: /* get drive type */
*(struct fd_type *)data = *fd->ft;
return (0);
case FD_STYPE: /* set drive type */
/*
* Allow setting drive type temporarily iff
* currently unset. Used for fdformat so any
* user can set it, and then start formatting.
*/
fd->fts = *(struct fd_type *)data;
if (fd->fts.sectrac) {
/* XXX: check for rubbish */
fdsettype(fd, &fd->fts);
} else {
fdsettype(fd, fd_native_types[fd->type]);
}
if (debugflags & 0x40)
fdprinttype(fd->ft);
return (0);
case FD_GOPTS: /* get drive options */
*(int *)data = fd->options;
return (0);
case FD_SOPTS: /* set drive options */
fd->options = *(int *)data;
return (0);
case FD_CLRERR:
error = priv_check(td, PRIV_DRIVER);
if (error)
return (error);
fd->fdc->fdc_errs = 0;
return (0);
case FD_GSTAT:
fsp = (struct fdc_status *)data;
if ((fd->fdc->flags & FDC_STAT_VALID) == 0)
return (EINVAL);
memcpy(fsp->status, fd->fdc->status, 7 * sizeof(u_int));
return (0);
case FD_GDTYPE:
*(enum fd_drivetype *)data = fd->type;
return (0);
case FD_FORM:
if (!(fflag & FWRITE))
return (EPERM);
if (((struct fd_formb *)data)->format_version !=
FD_FORMAT_VERSION)
return (EINVAL); /* wrong version of formatting prog */
error = fdmisccmd(fd, BIO_FMT, data);
mtx_lock(&fd->fdc->fdc_mtx);
fd->flags |= FD_NEWDISK;
mtx_unlock(&fd->fdc->fdc_mtx);
break;
case FD_READID:
rid = (struct fdc_readid *)data;
if (rid->cyl > 85 || rid->head > 1)
return (EINVAL);
error = fdmisccmd(fd, BIO_RDID, data);
break;
case FIONBIO:
case FIOASYNC:
/* For backwards compat with old fd*(8) tools */
error = 0;
break;
default:
if (debugflags & 0x80)
printf("Unknown ioctl %lx\n", cmd);
error = ENOIOCTL;
break;
}
return (error);
};
/*
* Configuration/initialization stuff, per controller.
*/
devclass_t fdc_devclass;
static devclass_t fd_devclass;
struct fdc_ivars {
int fdunit;
int fdtype;
};
void
fdc_release_resources(struct fdc_data *fdc)
{
device_t dev;
struct resource *last;
int i;
dev = fdc->fdc_dev;
if (fdc->fdc_intr)
bus_teardown_intr(dev, fdc->res_irq, fdc->fdc_intr);
fdc->fdc_intr = NULL;
if (fdc->res_irq != NULL)
bus_release_resource(dev, SYS_RES_IRQ, fdc->rid_irq,
fdc->res_irq);
fdc->res_irq = NULL;
last = NULL;
for (i = 0; i < FDC_MAXREG; i++) {
if (fdc->resio[i] != NULL && fdc->resio[i] != last) {
bus_release_resource(dev, SYS_RES_IOPORT,
fdc->ridio[i], fdc->resio[i]);
last = fdc->resio[i];
fdc->resio[i] = NULL;
}
}
if (fdc->res_drq != NULL)
bus_release_resource(dev, SYS_RES_DRQ, fdc->rid_drq,
fdc->res_drq);
fdc->res_drq = NULL;
}
int
fdc_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct fdc_ivars *ivars = device_get_ivars(child);
switch (which) {
case FDC_IVAR_FDUNIT:
*result = ivars->fdunit;
break;
case FDC_IVAR_FDTYPE:
*result = ivars->fdtype;
break;
default:
return (ENOENT);
}
return (0);
}
int
fdc_write_ivar(device_t dev, device_t child, int which, uintptr_t value)
{
struct fdc_ivars *ivars = device_get_ivars(child);
switch (which) {
case FDC_IVAR_FDUNIT:
ivars->fdunit = value;
break;
case FDC_IVAR_FDTYPE:
ivars->fdtype = value;
break;
default:
return (ENOENT);
}
return (0);
}
int
fdc_initial_reset(device_t dev, struct fdc_data *fdc)
{
int ic_type, part_id;
/*
* A status value of 0xff is very unlikely, but not theoretically
* impossible, but it is far more likely to indicate an empty bus.
*/
if (fdsts_rd(fdc) == 0xff)
return (ENXIO);
/*
* Assert a reset to the floppy controller and check that the status
* register goes to zero.
*/
fdout_wr(fdc, 0);
fdout_wr(fdc, 0);
if (fdsts_rd(fdc) != 0)
return (ENXIO);
/*
* Clear the reset and see it come ready.
*/
fdout_wr(fdc, FDO_FRST);
DELAY(100);
if (fdsts_rd(fdc) != 0x80)
return (ENXIO);
/* Then, see if it can handle a command. */
if (fdc_cmd(fdc, 3, NE7CMD_SPECIFY, 0xaf, 0x1e, 0))
return (ENXIO);
/*
* Try to identify the chip.
*
* The i8272 datasheet documents that unknown commands
* will return ST0 as 0x80. The i8272 is supposedly identical
* to the NEC765.
* The i82077SL datasheet says 0x90 for the VERSION command,
* and several "superio" chips emulate this.
*/
if (fdc_cmd(fdc, 1, NE7CMD_VERSION, 1, &ic_type))
return (ENXIO);
if (fdc_cmd(fdc, 1, 0x18, 1, &part_id))
return (ENXIO);
if (bootverbose)
device_printf(dev,
"ic_type %02x part_id %02x\n", ic_type, part_id);
switch (ic_type & 0xff) {
case 0x80:
device_set_desc(dev, "NEC 765 or clone");
fdc->fdct = FDC_NE765;
break;
case 0x81:
case 0x90:
device_set_desc(dev,
"Enhanced floppy controller");
fdc->fdct = FDC_ENHANCED;
break;
default:
device_set_desc(dev, "Generic floppy controller");
fdc->fdct = FDC_UNKNOWN;
break;
}
return (0);
}
int
fdc_detach(device_t dev)
{
struct fdc_data *fdc;
int error;
fdc = device_get_softc(dev);
/* have our children detached first */
if ((error = bus_generic_detach(dev)))
return (error);
if (fdc->fdc_intr)
bus_teardown_intr(dev, fdc->res_irq, fdc->fdc_intr);
fdc->fdc_intr = NULL;
/* kill worker thread */
mtx_lock(&fdc->fdc_mtx);
fdc->flags |= FDC_KTHREAD_EXIT;
wakeup(&fdc->head);
while ((fdc->flags & FDC_KTHREAD_ALIVE) != 0)
msleep(fdc->fdc_thread, &fdc->fdc_mtx, PRIBIO, "fdcdet", 0);
mtx_unlock(&fdc->fdc_mtx);
/* reset controller, turn motor off */
fdout_wr(fdc, 0);
if (!(fdc->flags & FDC_NODMA))
isa_dma_release(fdc->dmachan);
fdc_release_resources(fdc);
mtx_destroy(&fdc->fdc_mtx);
return (0);
}
/*
* Add a child device to the fdc controller. It will then be probed etc.
*/
device_t
fdc_add_child(device_t dev, const char *name, int unit)
{
struct fdc_ivars *ivar;
device_t child;
ivar = malloc(sizeof *ivar, M_DEVBUF /* XXX */, M_NOWAIT | M_ZERO);
if (ivar == NULL)
return (NULL);
child = device_add_child(dev, name, unit);
if (child == NULL) {
free(ivar, M_DEVBUF);
return (NULL);
}
device_set_ivars(child, ivar);
ivar->fdunit = unit;
ivar->fdtype = FDT_NONE;
if (resource_disabled(name, unit))
device_disable(child);
return (child);
}
int
fdc_attach(device_t dev)
{
struct fdc_data *fdc;
int error;
fdc = device_get_softc(dev);
fdc->fdc_dev = dev;
error = fdc_initial_reset(dev, fdc);
if (error) {
device_printf(dev, "does not respond\n");
return (error);
}
error = bus_setup_intr(dev, fdc->res_irq,
INTR_TYPE_BIO | INTR_ENTROPY |
((fdc->flags & FDC_NOFAST) ? INTR_MPSAFE : 0),
((fdc->flags & FDC_NOFAST) ? NULL : fdc_intr_fast),
((fdc->flags & FDC_NOFAST) ? fdc_intr : NULL),
fdc, &fdc->fdc_intr);
if (error) {
device_printf(dev, "cannot setup interrupt\n");
return (error);
}
if (!(fdc->flags & FDC_NODMA)) {
error = isa_dma_acquire(fdc->dmachan);
if (!error) {
error = isa_dma_init(fdc->dmachan,
MAX_BYTES_PER_CYL, M_WAITOK);
if (error)
isa_dma_release(fdc->dmachan);
}
if (error)
return (error);
}
fdc->fdcu = device_get_unit(dev);
fdc->flags |= FDC_NEEDS_RESET;
mtx_init(&fdc->fdc_mtx, "fdc lock", NULL, MTX_DEF);
/* reset controller, turn motor off, clear fdout mirror reg */
fdout_wr(fdc, fdc->fdout = 0);
bioq_init(&fdc->head);
kproc_create(fdc_thread, fdc, &fdc->fdc_thread, 0, 0,
"fdc%d", device_get_unit(dev));
settle = hz / 8;
return (0);
}
int
fdc_hints_probe(device_t dev)
{
const char *name, *dname;
int i, error, dunit;
/*
* Probe and attach any children. We should probably detect
* devices from the BIOS unless overridden.
*/
name = device_get_nameunit(dev);
i = 0;
while ((resource_find_match(&i, &dname, &dunit, "at", name)) == 0) {
resource_int_value(dname, dunit, "drive", &dunit);
fdc_add_child(dev, dname, dunit);
}
if ((error = bus_generic_attach(dev)) != 0)
return (error);
return (0);
}
int
fdc_print_child(device_t me, device_t child)
{
int retval = 0, flags;
retval += bus_print_child_header(me, child);
retval += printf(" on %s drive %d", device_get_nameunit(me),
fdc_get_fdunit(child));
if ((flags = device_get_flags(me)) != 0)
retval += printf(" flags %#x", flags);
retval += printf("\n");
return (retval);
}
/*
* Configuration/initialization, per drive.
*/
static int
fd_probe(device_t dev)
{
int i, unit;
u_int st0, st3;
struct fd_data *fd;
struct fdc_data *fdc;
int fdsu;
int flags, type;
fdsu = fdc_get_fdunit(dev);
fd = device_get_softc(dev);
fdc = device_get_softc(device_get_parent(dev));
flags = device_get_flags(dev);
fd->dev = dev;
fd->fdc = fdc;
fd->fdsu = fdsu;
unit = device_get_unit(dev);
/* Auto-probe if fdinfo is present, but always allow override. */
type = flags & FD_TYPEMASK;
if (type == FDT_NONE && (type = fdc_get_fdtype(dev)) != FDT_NONE) {
fd->type = type;
goto done;
} else {
/* make sure fdautoselect() will be called */
fd->flags = FD_EMPTY;
fd->type = type;
}
#if (defined(__i386__) && !defined(PC98)) || defined(__amd64__)
if (fd->type == FDT_NONE && (unit == 0 || unit == 1)) {
/* Look up what the BIOS thinks we have. */
if (unit == 0)
fd->type = (rtcin(RTC_FDISKETTE) & 0xf0) >> 4;
else
fd->type = rtcin(RTC_FDISKETTE) & 0x0f;
if (fd->type == FDT_288M_1)
fd->type = FDT_288M;
}
#endif /* __i386__ || __amd64__ */
/* is there a unit? */
if (fd->type == FDT_NONE)
return (ENXIO);
/*
mtx_lock(&fdc->fdc_mtx);
*/
/* select it */
fd_select(fd);
fd_motor(fd, 1);
fdc->fd = fd;
fdc_reset(fdc); /* XXX reset, then unreset, etc. */
DELAY(1000000); /* 1 sec */
if ((flags & FD_NO_PROBE) == 0) {
/* If we're at track 0 first seek inwards. */
if ((fdc_sense_drive(fdc, &st3) == 0) &&
(st3 & NE7_ST3_T0)) {
/* Seek some steps... */
if (fdc_cmd(fdc, 3, NE7CMD_SEEK, fdsu, 10, 0) == 0) {
/* ...wait a moment... */
DELAY(300000);
/* make ctrlr happy: */
fdc_sense_int(fdc, NULL, NULL);
}
}
for (i = 0; i < 2; i++) {
/*
* we must recalibrate twice, just in case the
* heads have been beyond cylinder 76, since
* most FDCs still barf when attempting to
* recalibrate more than 77 steps
*/
/* go back to 0: */
if (fdc_cmd(fdc, 2, NE7CMD_RECAL, fdsu, 0) == 0) {
/* a second being enough for full stroke seek*/
DELAY(i == 0 ? 1000000 : 300000);
/* anything responding? */
if (fdc_sense_int(fdc, &st0, NULL) == 0 &&
(st0 & NE7_ST0_EC) == 0)
break; /* already probed succesfully */
}
}
}
fd_motor(fd, 0);
fdc->fd = NULL;
/*
mtx_unlock(&fdc->fdc_mtx);
*/
if ((flags & FD_NO_PROBE) == 0 &&
(st0 & NE7_ST0_EC) != 0) /* no track 0 -> no drive present */
return (ENXIO);
done:
switch (fd->type) {
case FDT_12M:
device_set_desc(dev, "1200-KB 5.25\" drive");
break;
case FDT_144M:
device_set_desc(dev, "1440-KB 3.5\" drive");
break;
case FDT_288M:
device_set_desc(dev, "2880-KB 3.5\" drive (in 1440-KB mode)");
break;
case FDT_360K:
device_set_desc(dev, "360-KB 5.25\" drive");
break;
case FDT_720K:
device_set_desc(dev, "720-KB 3.5\" drive");
break;
default:
return (ENXIO);
}
fd->track = FD_NO_TRACK;
fd->fdc = fdc;
fd->fdsu = fdsu;
fd->options = 0;
callout_init_mtx(&fd->toffhandle, &fd->fdc->fdc_mtx, 0);
/* initialize densities for subdevices */
fdsettype(fd, fd_native_types[fd->type]);
return (0);
}
/*
* We have to do this in a geom event because GEOM is not running
* when fd_attach() is.
* XXX: move fd_attach after geom like ata/scsi disks
*/
static void
fd_attach2(void *arg, int flag)
{
struct fd_data *fd;
fd = arg;
fd->fd_geom = g_new_geomf(&g_fd_class,
"fd%d", device_get_unit(fd->dev));
fd->fd_provider = g_new_providerf(fd->fd_geom, "%s", fd->fd_geom->name);
fd->fd_geom->softc = fd;
g_error_provider(fd->fd_provider, 0);
}
static int
fd_attach(device_t dev)
{
struct fd_data *fd;
fd = device_get_softc(dev);
g_post_event(fd_attach2, fd, M_WAITOK, NULL);
fd->flags |= FD_EMPTY;
bioq_init(&fd->fd_bq);
return (0);
}
static void
fd_detach_geom(void *arg, int flag)
{
struct fd_data *fd = arg;
g_topology_assert();
g_wither_geom(fd->fd_geom, ENXIO);
}
static int
fd_detach(device_t dev)
{
struct fd_data *fd;
fd = device_get_softc(dev);
g_waitfor_event(fd_detach_geom, fd, M_WAITOK, NULL);
while (device_get_state(dev) == DS_BUSY)
tsleep(fd, PZERO, "fdd", hz/10);
callout_drain(&fd->toffhandle);
return (0);
}
static device_method_t fd_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, fd_probe),
DEVMETHOD(device_attach, fd_attach),
DEVMETHOD(device_detach, fd_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend), /* XXX */
DEVMETHOD(device_resume, bus_generic_resume), /* XXX */
{ 0, 0 }
};
static driver_t fd_driver = {
"fd",
fd_methods,
sizeof(struct fd_data)
};
static int
fdc_modevent(module_t mod, int type, void *data)
{
return (g_modevent(NULL, type, &g_fd_class));
}
DRIVER_MODULE(fd, fdc, fd_driver, fd_devclass, fdc_modevent, 0);
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