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now even compiles, but still untested...
[unix-history] / usr / src / sys / vax / uba / rx.c
/* rx.c 4.2 83/02/21 */
#include "rx.h"
#if NFX > 0
/*
* RX02 floppy disk device driver
*
* WARNING, UNTESTED
*/
#include "../machine/pte.h"
#include "../h/param.h"
#include "../h/buf.h"
#include "../h/systm.h"
#include "../h/conf.h"
#include "../h/errno.h"
#include "../h/time.h"
#include "../h/kernel.h"
#include "../h/uio.h"
#include "../h/file.h"
#include "../vax/cpu.h"
#include "../vax/nexus.h"
#include "../vaxuba/ubavar.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/rxreg.h"
/* per-controller data */
struct rx_ctlr {
int rxc_state; /* controller state */
#define RXS_READ 1 /* read started */
#define RXS_EMPTY 2 /* empty started */
#define RXS_FILL 3 /* fill started */
#define RXS_WRITE 4 /* write started */
#define RXS_FORMAT 5 /* format started */
#define RXS_RDSTAT 6 /* status read started */
#define RXS_RDERR 7 /* error read started */
#define RXS_IDLE 8 /* device is idle */
u_short rxc_rxcs; /* extended error status */
u_short rxc_rxdb;
u_short rxc_rxxt[4];
#define RX_MAXTIMEOUT 30 /* # seconds to wait before giving up */
} rx_ctlr[NFX];
struct buf rrxbuf[NFX]; /* buffer for I/O */
struct buf erxbuf[NFX]; /* buffer for reading error status */
/* per-drive data */
struct rx_softc {
int sc_flags; /* drive status flags */
#define RXF_DBLDEN 0x01 /* use double density */
#define RXF_DIRECT 0x02 /* use direct sector mapping */
#define RXF_TRKZERO 0x04 /* start mapping on track 0 */
#define RXF_DEVTYPE 0x07 /* density and mapping flags */
#define RXF_OPEN 0x10 /* open */
#define RXF_DDMK 0x20 /* deleted-data mark detected */
#define RXF_USEWDDS 0x40 /* write deleted-data sector */
int sc_csbits; /* constant bits for CS register */
int sc_tocnt; /* for watchdog routine */
} rx_softc[NRX];
struct rxerr {
short rxcs;
short rxdb;
short rxxt[4]; /* error code dump from controller */
} rxerr[NFX];
struct uba_device *rxdinfo[NRX];
struct uba_ctlr *rxminfo[NFX];
int rxprobe(), rxslave(), rxattach(), rxdgo(), rxintr();
int rxwatch(), rxphys();
u_short rxstd[] = { 0177170, 0177150, 0 };
struct uba_driver fxdriver =
{ rxprobe, rxslave, rxattach, rxdgo, rxstd, "rx", rxdinfo, "fx", rxminfo };
int rxwstart;
#define RXUNIT(dev) (minor(dev)>>4)
/* constants related to floppy data capacity */
#define RXSECS 2002 /* # sectors on a floppy */
#define DDSTATE (sc->sc_flags&RXF_DBLDEN)
#define NBPS (DDSTATE ? 256 : 128) /* # bytes per sector */
#define NWPS (DDSTATE ? 128 : 64) /* # words per sector */
#define RXSIZE (DDSTATE ? 512512 : 256256) /* # bytes per disk */
#define SECSHFT (DDSTATE ? 8 : 7) /* # bits to shift for sctr # */
#define SECMASK (DDSTATE ? 0xff : 0x7f) /* shifted-out bits of offset */
#define B_CTRL 0x80000000 /* control (format) request */
/*ARGSUSED*/
rxprobe (reg)
caddr_t reg;
{
register int br, cvec; /* value-result */
struct rxdevice *rxaddr = (struct rxdevice *)reg;
#ifdef lint
br = 0; cvec = br; br = cvec;
rxintr(0);
#endif lint
rxaddr->rxcs = RX_INTR;
DELAY(10);
rxaddr->rxcs = 0;
return (sizeof (*rxaddr));
}
rxslave(ui,reg)
struct uba_device *ui;
caddr_t reg;
{
ui->ui_dk = 1;
return (ui->ui_slave == 0 || ui->ui_slave == 1);
}
/*ARGSUSED*/
rxattach(ui)
struct uba_device *ui;
{
}
/*ARGSUSED1*/
rxopen(dev, flag)
dev_t dev;
int flag;
{
register int unit = RXUNIT(dev);
register struct rx_softc *sc;
register struct uba_device *ui;
if (unit >= NRX || (minor(dev) & 0x8) ||
(ui = rxdinfo[unit]) == 0 || ui->ui_alive == 0)
return (ENXIO);
sc = &rx_softc[unit];
if (sc->sc_flags & RXF_OPEN)
return (EBUSY);
sc->sc_flags = RXF_OPEN | (minor(dev) & RXF_DEVTYPE);
sc->sc_csbits = RX_INTR;
sc->sc_csbits |= ui->ui_slave == 0 ? RX_DRV0 : RX_DRV1;
sc->sc_csbits |= minor(dev) & RXF_DBLDEN ? RX_DDEN : RX_SDEN;
return (0);
}
/*ARGSUSED1*/
rxclose(dev, flag)
dev_t dev;
int flag;
{
register struct rx_softc *sc = &rx_softc[RXUNIT(dev)];
sc->sc_flags &= ~RXF_OPEN;
sc->sc_csbits = 0;
}
rxstrategy(bp)
register struct buf *bp;
{
struct uba_device *ui;
register struct rx_softc *sc;
register struct uba_ctlr *um;
int s;
ui = rxdinfo[RXUNIT(bp->b_dev)];
if (ui == 0 || ui->ui_alive == 0) {
bp->b_flags |= B_ERROR;
iodone(bp);
return;
}
um = ui->ui_mi;
bp->b_actf = NULL;
s = spl5();
if (um->um_tab.b_actf->b_actf == NULL)
um->um_tab.b_actf->b_actf = bp;
else
um->um_tab.b_actf->b_actl->b_forw = bp;
um->um_tab.b_actf->b_actl = bp;
bp = um->um_tab.b_actf;
if (!um->um_tab.b_active && bp->b_actf)
rxstart(um);
splx(s);
}
/*
* Sector mapping routine.
* Two independent sets of choices are available:
*
* (a) The first logical sector may either be on track 1 or track 0.
* (b) The sectors on a track may either be taken in 2-for-1 interleaved
* fashion or directly.
* This gives a total of four possible mapping schemes.
*
* Physical tracks on the RX02 are numbered 0-76. Physical sectors on
* each track are numbered 1-26.
*
* When interleaving is used, sectors on the first logical track are
* taken in the order 1, 3, 5, ..., 25, 2, 4, 6, ..., 26. A skew of
* six sectors per track is also used (to allow time for the heads to
* move); hence, the sectors on the second logical track are taken in
* the order 7, 9, 11, ..., 25, 1, 3, 5, 8, 10, 12, ..., 26, 2, 4, 6;
* the third logical track starts with sector 13; and so on.
*
* When the mapping starts with track 1, track 0 is the last logical
* track, and this track is always handled directly (without inter-
* leaving), even when the rest of the disk is interleaved. (This is
* still compatible with DEC RT-11, which does not use track 0 at all.)
*/
rxmap(bp, psector, ptrack)
struct buf *bp;
int *psector, *ptrack;
{
register int lt, ls, ptoff;
struct rx_softc *sc = &rx_softc[RXUNIT(bp->b_dev)];
ls = bp->b_blkno * (NBPS / DEV_BSIZE);
lt = ls / 26;
ls %= 26;
/*
* The "physical track offset" (ptoff) takes the
* starting physical track (0 or 1) and the desired
* interleaving into account. If lt+ptoff >= 77,
* then interleaving is not performed.
*/
ptoff = 0;
if (sc->sc_flags&RXF_DIRECT)
ptoff = 77;
if (sc->sc_flags&RXF_TRKZERO)
ptoff++;
if (lt + ptoff < 77)
ls = ((ls << 1) + (ls >= 13) + (6*lt)) % 26;
*ptrack = (lt + ptoff) % 77;
*psector = ls + 1;
}
rxstart(um)
register struct uba_ctlr *um;
{
register struct rxdevice *rxaddr;
register struct rx_ctlr *rxc;
register struct rx_softc *sc;
struct buf *bp;
int unit, sector, track;
if (um->um_tab.b_active || (bp = um->um_tab.b_actf->b_actf) == NULL)
return;
um->um_tab.b_active++;
unit = RXUNIT(bp->b_dev);
sc = &rx_softc[unit];
rxaddr = (struct rxdevice *)um->um_addr;
rxc = &rx_ctlr[um->um_ctlr];
rxtimo(bp->b_dev); /* start watchdog */
if (bp->b_flags&B_CTRL) { /* format */
rxc->rxc_state = RXS_FORMAT;
rxaddr->rxcs = RX_FORMAT | sc->sc_csbits;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = 'I';
return;
}
if (bp->b_flags&B_READ) { /* read */
rxmap(bp, &sector, &track);
rxc->rxc_state = RXS_READ;
rxaddr->rxcs = RX_READ | sc->sc_csbits;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = (u_short)sector;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = (u_short)track;
return;
}
rxc->rxc_state = RXS_FILL; /* write */
um->um_cmd = RX_FILL;
(void) ubago(rxdinfo[unit]);
}
rxdgo(um)
struct uba_ctlr *um;
{
register struct rxdevice *rxaddr = (struct rxdevice *)um->um_addr;
int ubinfo = um->um_ubinfo;
struct buf *bp = &rrxbuf[um->um_ctlr];
struct rx_softc *sc = &rx_softc[RXUNIT(bp->b_dev)];
struct rx_ctlr *rxc = &rx_ctlr[um->um_ctlr];
bp = um->um_tab.b_actf;
sc->sc_tocnt = 0;
if (rxc->rxc_state != RXS_RDERR) {
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = bp->b_bcount >> 1;
}
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = ubinfo;
rxaddr->rxcs = um->um_cmd | ((ubinfo & 0x30000) >> 4) | sc->sc_csbits;
}
rxintr(dev)
dev_t dev;
{
int unit = RXUNIT(dev), sector, track;
struct uba_ctlr *um = rxminfo[unit];
register struct rxdevice *rxaddr;
register struct buf *bp;
register struct rx_softc *sc = &rx_softc[unit];
struct uba_device *ui = rxdinfo[unit];
struct rxerr *er;
register struct rx_ctlr *rxc;
sc->sc_tocnt = 0;
if (!um->um_tab.b_active)
return;
rxaddr = (struct rxdevice *)um->um_addr;
rxc = &rx_ctlr[um->um_ctlr];
er = &rxerr[um->um_ctlr];
bp = um->um_tab.b_actf->b_actf;
if ((rxaddr->rxcs & RX_ERR) &&
rxc->rxc_state != RXS_RDSTAT && rxc->rxc_state != RXS_RDERR)
goto error;
switch (rxc->rxc_state) {
/*
* Incomplete commands. Perform next step
* and return. Note that b_active is set on
* entrance and, therefore, also on exit.
*/
case RXS_READ:
if (rxaddr->rxdb & RXES_DDMARK)
sc->sc_flags |= RXF_DDMK;
else
sc->sc_flags &= ~RXF_DDMK;
rxc->rxc_state = RXS_EMPTY;
um->um_cmd = RX_EMPTY;
(void) ubago(ui);
return;
case RXS_FILL:
rxc->rxc_state = RXS_WRITE;
if (sc->sc_flags & RXF_USEWDDS) {
rxaddr->rxcs = RX_WDDS | sc->sc_csbits;
sc->sc_flags &= ~RXF_USEWDDS;
} else
rxaddr->rxcs = RX_WRITE | sc->sc_csbits;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxmap(bp, &sector, &track);
rxaddr->rxdb = sector;
while ((rxaddr->rxcs&RX_TREQ) == 0)
;
rxaddr->rxdb = track;
return;
/*
* Possibly completed command.
*/
case RXS_RDSTAT:
if (rxaddr->rxdb&RXES_READY)
goto rderr;
bp->b_error = EBUSY;
bp->b_flags |= B_ERROR;
goto done;
/*
* Command completed.
*/
case RXS_EMPTY:
case RXS_WRITE:
case RXS_FORMAT:
goto done;
case RXS_RDERR:
rxmap(bp, &sector, &track);
printf("rx%d: hard error, lsn%d (trk %d psec %d) ",
unit, bp->b_blkno * (NBPS / DEV_BSIZE),
track, sector);
printf("cs=%b, db=%b, err=%x\n", er->rxcs,
RXCS_BITS, er->rxdb, RXES_BITS, er->rxxt[0]);
goto done;
default:
printf("rx%d: state %d (reset)", unit, rxc->rxc_state);
rxreset(um->um_ubanum);
printf("\n");
return;
}
error:
/*
* In case of an error:
* (a) Give up now if a format (ioctl) was in progress, or if a
* density error was detected.
* (b) Retry up to nine times if a CRC (data) error was detected,
* then give up if the error persists.
* (c) In all other cases, reinitialize the drive and try the
* operation once more before giving up.
*/
if (rxc->rxc_state == RXS_FORMAT || (rxaddr->rxdb&RXES_DENERR))
goto giveup;
if (rxaddr->rxdb & RXES_CRCERR) {
if (++bp->b_errcnt >= 10)
goto giveup;
goto retry;
}
bp->b_errcnt += 9;
if (bp->b_errcnt >= 10)
goto giveup;
rxaddr->rxcs = RX_INIT;
/* no way to get an interrupt for "init done", so just wait */
while ((rxaddr->rxdb&RX_DONE) == 0)
;
retry:
/*
* In case we already have UNIBUS resources, give
* them back since we reallocate things in rxstart.
*/
if (um->um_ubinfo)
ubadone(um);
rxstart(um);
return;
giveup:
/*
* Hard I/O error --
* Density errors are not noted on the console since the
* only way to determine the density of an unknown disk
* is to try one density or the other at random and see
* which one doesn't give a density error.
*/
if (rxaddr->rxdb & RXES_DENERR) {
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
goto done;
}
rxc->rxc_state = RXS_RDSTAT;
rxaddr->rxcs = RX_RDSTAT | sc->sc_csbits;
return;
rderr:
/*
* A hard error (other than not ready or density) has occurred.
* Read the extended error status information.
* Before doing this, save the current CS and DB register values,
* because the read error status operation may modify them.
* Insert buffer with request at the head of the queue.
*/
bp->b_error = EIO;
bp->b_flags |= B_ERROR;
ubadone(um);
er->rxcs = rxaddr->rxcs;
er->rxdb = rxaddr->rxdb;
bp = &erxbuf[unit];
bp->b_un.b_addr = (caddr_t)er->rxxt;
bp->b_bcount = sizeof (er->rxxt);
bp->b_flags &= ~(B_DIRTY|B_UAREA|B_PHYS|B_PAGET);
if (um->um_tab.b_actf->b_actf == NULL)
um->um_tab.b_actf->b_actl = bp;
bp->b_forw = um->um_tab.b_actf->b_actf;
um->um_tab.b_actf->b_actf = bp;
rxc->rxc_state = RXS_RDERR;
um->um_cmd = RX_RDERR;
(void) ubago(ui);
return;
done:
um->um_tab.b_active = 0;
um->um_tab.b_actf->b_actf = bp->b_forw;
bp->b_resid = 0;
iodone(bp);
rxc->rxc_state = RXS_IDLE;
ubadone(um);
/*
* If this unit has more work to do,
* start it up right away
*/
if (um->um_tab.b_actf->b_actf)
rxstart(um);
}
/*ARGSUSED*/
minrxphys(bp)
struct buf *bp;
{
struct rx_softc *sc = &rx_softc[RXUNIT(bp->b_dev)];
if (bp->b_bcount > NBPS)
bp->b_bcount = NBPS;
}
rxtimo(dev)
dev_t dev;
{
register struct rx_softc *sc = &rx_softc[RXUNIT(dev)];
if (sc->sc_flags & RXF_OPEN)
timeout(rxtimo, (caddr_t)dev, hz);
if (++sc->sc_tocnt < RX_MAXTIMEOUT)
return;
rxintr(dev);
}
rxreset(uban)
int uban;
{
register struct uba_ctlr *um;
register struct rxdevice *rxaddr;
register int ctlr;
for (ctlr = 0; ctlr < NFX; ctlr++) {
if ((um = rxminfo[ctlr]) == 0 || um->um_ubanum != uban ||
um->um_alive == 0)
continue;
printf(" fx%d", ctlr);
if (um->um_ubinfo) {
printf("<%d>", (um->um_ubinfo>>28)&0xf);
um->um_ubinfo = 0;
}
rx_ctlr[ctlr].rxc_state = RXS_IDLE;
rxaddr = (struct rxdevice *)um->um_addr;
rxaddr->rxcs = RX_INIT;
while ((rxaddr->rxdb&RX_DONE) == 0)
;
rxstart(um);
}
}
rxread(dev, uio)
dev_t dev;
struct uio *uio;
{
int unit = RXUNIT(dev), ctlr = rxdinfo[unit]->ui_ctlr;
struct rx_softc *sc = &rx_softc[RXUNIT(dev)];
if (uio->uio_offset + uio->uio_resid > RXSIZE)
return (ENXIO);
if (uio->uio_offset < 0 || (uio->uio_offset & SECMASK) != 0)
return (EIO);
return (physio(rxstrategy, &rrxbuf[ctlr], dev, B_READ, minrxphys));
}
rxwrite(dev, uio)
dev_t dev;
struct uio *uio;
{
int unit = RXUNIT(dev), ctlr = rxdinfo[unit]->ui_ctlr;
struct rx_softc *sc = &rx_softc[RXUNIT(dev)];
if (uio->uio_offset + uio->uio_resid > RXSIZE)
return (ENXIO);
if (uio->uio_offset < 0 || (uio->uio_offset & SECMASK) != 0)
return (EIO);
return (physio(rxstrategy, &rrxbuf[ctlr], dev, B_WRITE, minrxphys));
}
/*
* Control routine:
* processes three kinds of requests:
*
* (1) Set density according to that specified by the open device.
* (2) Arrange for the next sector to be written with a deleted-
* data mark.
* (3) Report whether the last sector read had a deleted-data mark
* (by returning with an EIO error code if it did).
*
* Requests relating to deleted-data marks can be handled right here.
* A "set density" request, however, must additionally be processed
* through "rxstart", just like a read or write request.
*/
/*ARGSUSED3*/
rxioctl(dev, cmd, data, flag)
dev_t dev;
int cmd;
caddr_t data;
int flag;
{
int unit = RXUNIT(dev);
struct rx_softc *sc = &rx_softc[unit];
switch (cmd) {
case RXIOC_FORMAT:
if ((flag&FWRITE) == 0)
return (EBADF);
return (rxformat(dev));
case RXIOC_WDDS:
sc->sc_flags |= RXF_USEWDDS;
return (0);
case RXIOC_RDDSMK:
*(int *)data = sc->sc_flags & RXF_DDMK;
return (0);
}
return (ENXIO);
}
/*
* Initiate a format command.
*/
rxformat(dev)
dev_t dev;
{
int ctlr = rxdinfo[RXUNIT(dev)]->ui_mi->um_ctlr;
struct buf *bp;
struct rx_softc *sc = &rx_softc[RXUNIT(dev)];
int s, error = 0;
bp = &rrxbuf[ctlr];
s = spl5();
while (bp->b_flags & B_BUSY)
sleep(bp, PRIBIO);
bp->b_flags = B_BUSY | B_CTRL;
splx(s);
sc->sc_flags = RXS_FORMAT;
bp->b_dev = dev;
bp->b_error = 0;
bp->b_resid = 0;
rxstrategy (bp);
iowait(bp);
if (bp->b_flags & B_ERROR)
error = bp->b_error;
bp->b_flags &= ~B_BUSY;
wakeup((caddr_t)bp);
return (error);
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.