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BSD 4_2 release
[unix-history] / usr / src / sys / vaxuba / uu.c
/* uu.c 6.1 83/07/29 */
#include "uu.h"
#if NUU > 0
/*
* TU58 DECtape II/DL11 device driver
*
* The TU58 is treated as a block device (only). Error detection and
* recovery is not very extensive, but sufficient to handle the most
* common errors. It is assumed that the TU58 will follow the RSP
* protocol exactly, very few protocol errors are checked for.
*
* To reduce interrupt latency, `options UUDMA' should be specified
* in the config file to make sure the `pseudo-DMA' code in locore.s
* will be compiled into the system. Otherwise overrun errors will
* occur frequently (these errors are not reported).
*
* TODO:
*
* - Add ioctl code to wind/rewind cassette
*
*/
#include "../machine/pte.h"
#include "../h/param.h"
#include "../h/systm.h"
#include "../h/buf.h"
#include "../h/conf.h"
#include "../h/time.h"
#include "../h/kernel.h"
#include "../h/errno.h"
#include "../h/file.h"
#include "../vax/cpu.h"
#include "../vax/nexus.h"
#include "../vax/rsp.h"
#include "../vaxuba/ubavar.h"
#include "../vaxuba/ubareg.h"
#include "../vaxuba/uureg.h"
#define NTUBLK 512 /* number of blocks on a TU58 cassette */
#define WRV 01 /* bit in minor dev => write w. read verify */
#define NDPC 02 /* drives per controller */
#define NUX NDPC * NUU /* number of drives */
#define NUUQ 02 /* # of block which can be queued up */
#define UMASK 01 /* unit number mask */
#define UUIPL 0x14 /* ipl level to use */
struct packet uucmd[NUU]; /* a command sent to the TU58 */
struct packet uudata[NUU]; /* a command or data returned from TU58 */
struct buf uitab[NUU]; /* buffer queue headers */
/*
* Driver soft carrier structure
*/
struct uu_softc {
u_char *tu_rbptr; /* pointer to buffer for read */
int tu_rcnt; /* how much to read */
u_char *tu_wbptr; /* pointer to buffer for write */
int tu_wcnt; /* how much to write */
int tu_state; /* current state of tansfer operation */
int tu_flag; /* read in progress flag */
char *tu_addr; /* real buffer data address */
int tu_count; /* real requested count */
int tu_serrs; /* count of soft errors */
int tu_cerrs; /* count of checksum errors */
int tu_herrs; /* count of hard errors */
char tu_dopen[2]; /* drive is open */
} uu_softc[NUU];
#if defined(VAX750) || defined(VAX730)
extern char *tustates[];
#else
char *tustates[TUS_NSTATES] = {
"INIT1", "INIT2", "IDLE", "SENDH", "SENDD", "SENDC", "SENDR",
"SENDW", "GETH", "GETD", "GETC", "GET", "WAIT", "RCVERR", "CHKERR"
};
#endif
#define UNIT(dev) (minor(dev)>>1)
u_char uunull[2] = { 0, 0 }; /* nulls to send for initialization */
u_char uuinit[2] = { TUF_INITF, TUF_INITF }; /* inits to send */
struct uba_device *uudinfo[NUU];
int uuprobe(), uuattach(), uurintr(), uuxintr(), uuwatch();
u_short uustd[] = { 0176500 };
struct uba_driver uudriver =
{ uuprobe, 0, uuattach, 0, uustd, "uu", uudinfo };
int uuwstart;
int uuwake();
static char uu_pcnt[NUX]; /* pee/vee counters, one per drive */
/*ARGSUSED*/
uuprobe(reg)
caddr_t reg;
{
register int br, cvec; /* value result */
struct uudevice *uuaddr = (struct uudevice *)reg;
#ifdef lint
br = 0; cvec = br; br = cvec;
uurintr(0); uuxintr(0);
#endif
uuaddr->tcs = UUCS_INTR;
DELAY(1000);
uuaddr->tcs = 0;
cvec -= 4; /* since we are using the xmitter intrpt */
return(sizeof (*uuaddr));
}
uuattach(ui)
register struct uba_device *ui;
{
}
/*ARGSUSED1*/
uuopen(dev, flag)
dev_t dev;
int flag;
{
register struct uba_device *ui;
register struct uu_softc *uuc;
register struct uudevice *uuaddr;
int ctlr, unit = UNIT(dev), s;
ctlr = unit / NDPC;
if (unit >= NUX || (ui = uudinfo[ctlr]) == 0 || ui->ui_alive == 0)
return (ENXIO);
uuc = &uu_softc[ctlr];
if (uuc->tu_dopen[unit&UMASK])
return (EBUSY);
if (uuwstart++ == 0)
timeout(uuwatch, (caddr_t)0, hz);
uuc->tu_dopen[unit&UMASK]++;
uuaddr = (struct uudevice *)ui->ui_addr;
s = splx(UUIPL);
/*
* If the other device on this controller
* is already active, no need to initialize
*/
if (uuc->tu_dopen[0] && uuc->tu_dopen[1])
goto ok;
/*
* If the unit already initialized,
* just enable interrupts and return.
*/
if (uuc->tu_state == TUS_IDLE) {
uuaddr->rcs = UUCS_INTR;
goto ok;
}
/*
* Must initialize, reset the cassette
* and wait for things to settle down.
*/
uureset(ctlr);
sleep((caddr_t)uuc, PZERO+1);
uitab[ctlr].b_active = NULL;
if (uuc->tu_state != TUS_IDLE) {
uuc->tu_state = TUS_INIT1;
uuc->tu_dopen[unit&UMASK] = 0;
uuc->tu_rcnt = uuc->tu_wcnt = 0;
uuaddr->rcs = 0;
uuaddr->tcs = 0;
splx(s);
return (EIO);
}
ok:
splx(s);
return (0);
}
/*
* Wait for all outstanding IO on this drive
* complete, before closing. If both drives on
* this controller are idle, mark the controller
* `inactive'.
*/
uuclose(dev, flag)
dev_t dev;
int flag;
{
int s, unit = UNIT(dev);
register struct uu_softc *uuc = &uu_softc[unit/NDPC];
struct buf *bp, *last = NULL;
struct uudevice *uuaddr = (struct uudevice *)uudinfo[unit/NDPC]->ui_addr;
s = splx(UUIPL);
while (uu_pcnt[unit])
sleep(&uu_pcnt[unit], PRIBIO);
/*
* No more writes are pending, scan the
* buffer queue for oustanding reads from
* this unit.
*/
for (bp = uitab[unit/NDPC].b_actf; bp; bp = bp->b_actf) {
if (bp->b_dev == dev)
last = bp;
}
if (last) {
last->b_flags |= B_CALL;
last->b_iodone = uuwake;
sleep((caddr_t)last, PRIBIO);
}
uuc->tu_dopen[unit&UMASK] = 0;
if (!uuc->tu_dopen[0] && !uuc->tu_dopen[1]) {
uuc->tu_flag = 0;
uuaddr->rcs = 0;
}
splx(s);
}
uuwake(bp)
struct buf *bp;
{
wakeup(bp);
}
uureset(ctlr)
int ctlr;
{
register struct uu_softc *uuc = &uu_softc[ctlr];
register struct packet *cmd = &uucmd[ctlr];
struct uba_device *ui = uudinfo[ctlr];
register struct uudevice *uuaddr = (struct uudevice *)ui->ui_addr;
uitab[ctlr].b_active++;
uuc->tu_state = TUS_INIT1;
uuc->tu_wbptr = uunull;
uuc->tu_wcnt = sizeof (uunull);
uuc->tu_rcnt = 0;
cmd->pk_flag = TUF_CMD;
cmd->pk_mcount = sizeof (*cmd) - 4;
cmd->pk_mod = 0;
cmd->pk_seq = 0;
cmd->pk_sw = 0;
uuaddr->rcs = 0;
uuaddr->tcs = UUCS_INTR | UUCS_BREAK;
uuxintr(ctlr); /* start output */
}
/*
* Strategy routine for block I/O
*/
uustrategy(bp)
register struct buf *bp;
{
register struct buf *uutab;
struct uba_device *ui;
int s, unit = UNIT(bp->b_dev);
if ((unit > NUX) || (bp->b_blkno >= NTUBLK))
goto bad;
ui = uudinfo[unit/NDPC];
if (ui == 0 || ui->ui_alive == 0)
goto bad;
uutab = &uitab[unit/NDPC]; /* one request queue per controller */
s = splx(UUIPL);
if ((bp->b_flags&B_READ) == 0)
tu_pee(&uu_pcnt[unit]);
bp->b_actf = NULL;
if (uutab->b_actf == NULL)
uutab->b_actf = bp;
else
uutab->b_actl->b_actf = bp;
uutab->b_actl = bp;
if (uutab->b_active == 0)
uustart(ui);
splx(s);
return;
bad:
bp->b_flags |= B_ERROR;
bp->b_error = ENXIO;
iodone(bp);
return;
}
/*
* Start the transfer
*/
uustart(ui)
register struct uba_device *ui;
{
register struct buf *bp;
register struct uu_softc *uuc;
struct packet *cmd;
int ctlr = ui->ui_unit, s;
if ((bp = uitab[ctlr].b_actf) == NULL)
return;
s = splx(UUIPL);
uuc = &uu_softc[ctlr];
if (uuc->tu_state != TUS_IDLE) {
uureset(ctlr);
splx(s);
return;
}
cmd = &uucmd[ctlr];
uitab[ctlr].b_active++;
uitab[ctlr].b_errcnt = 0;
uuc->tu_addr = bp->b_un.b_addr;
uuc->tu_count = cmd->pk_count = bp->b_bcount;
cmd->pk_block = bp->b_blkno;
if (bp->b_flags&B_READ) {
cmd->pk_op = TUOP_READ;
cmd->pk_mod = 0;
uuc->tu_state = TUS_SENDR;
} else {
cmd->pk_op = TUOP_WRITE;
cmd->pk_mod = minor(bp->b_dev)&WRV ? TUMD_WRV : 0;
uuc->tu_state = TUS_SENDW;
}
cmd->pk_unit = UNIT(bp->b_dev)&UMASK;
cmd->pk_sw = 0;
cmd->pk_chksum =
tuchk(*((short *)cmd), (u_short *)&cmd->pk_op, (int)cmd->pk_mcount);
uuc->tu_wbptr = (u_char *)cmd;
uuc->tu_wcnt = sizeof (*cmd);
uuxintr(ctlr);
splx(s);
}
/*
* TU58 receiver interrupt, handles whatever condition the
* pseudo DMA routine in locore is unable to handle,
* or, if UUDMA is undefined, handle all receiver interrupt
* processing.
*/
uurintr(ctlr)
int ctlr;
{
struct uba_device *ui = uudinfo[ctlr];
register struct uu_softc *uuc = &uu_softc[ctlr];
register struct uudevice *uuaddr = (struct uudevice *)ui->ui_addr;
register struct buf *uutab = &uitab[ctlr];
struct packet *data, *cmd;
struct buf *bp;
int c, unit;
c = uuaddr->rdb;
data = &uudata[ctlr];
cmd = &uucmd[ctlr];
#if !defined(UUDMA)
if (c & UURDB_ERROR)
uuc->tu_state = TUS_RCVERR;
else {
if (uuc->tu_rcnt) {
*uuc->tu_rbptr++ = c;
if (--uuc->tu_rcnt)
return;
}
}
#endif
/*
* Switch on the tu_state of the transfer.
*/
switch(uuc->tu_state) {
/*
* A data error occured in uudma
* (either overrun or break)
*/
case TUS_RCVERR:
if ((c & UURDB_ORUN) == 0)
printf("uu%d: break received, transfer restarted\n",
data->pk_unit);
#ifdef UUDEBUG
else
printf("uu%d: data overrun, recovered\n",
data->pk_unit);
#endif
uuc->tu_serrs++;
uu_restart(ctlr, ui);
break;
/*
* If we get an unexpected "continue",
* start all over again...
*/
case TUS_INIT2:
uuc->tu_state = c == TUF_CONT ? TUS_IDLE : TUS_INIT1;
uuc->tu_flag = 0;
wakeup((caddr_t)uuc);
uustart(ui);
break;
/*
* Only transition from this state
* is on a "continue", so if we don't
* get it, reset the world.
*/
case TUS_WAIT: /* waiting for continue */
switch(c) {
case TUF_CONT: /* got the expected continue */
uuc->tu_flag = 0;
data->pk_flag = TUF_DATA;
data->pk_mcount = MIN(128, uuc->tu_count);
data->pk_chksum =
tuchk(*((short *)data), (caddr_t)uuc->tu_addr,
(int)data->pk_mcount);
uuc->tu_state = TUS_SENDH;
uuc->tu_wbptr = (u_char *)data;
uuc->tu_wcnt = 2;
uuxintr(ctlr);
break;
case TUF_CMD: /* sending us an END packet...error */
uuc->tu_state = TUS_GET;
uuc->tu_rbptr = (u_char *)data;
uuc->tu_rcnt = sizeof (*data) - 1;
uuc->tu_flag = 1;
uuaddr->tcs = 0;
*uuc->tu_rbptr++ = c & UUDB_DMASK;
break;
case TUF_INITF:
uureset(ctlr);
break;
default: /* something random...bad news */
uuc->tu_state = TUS_INIT1;
break;
}
break;
case TUS_SENDW:
if (c != TUF_CONT && c != TUF_INITF)
goto bad;
uu_restart(ctlr, ui);
break;
/*
* Got header, now get data; amount to
* fetch is included in packet.
* (data packets are handled entirely
* in uudma)
*/
case TUS_GETH:
#ifndef UUDMA
if (data->pk_flag == TUF_DATA)
uuc->tu_rbptr = (u_char *)uuc->tu_addr;
#endif
uuc->tu_rcnt = data->pk_mcount;
uuc->tu_state = TUS_GETD;
break;
/*
* Got the data, now fetch the checksum.
*/
case TUS_GETD:
uuc->tu_rbptr = (u_char *)&data->pk_chksum;
uuc->tu_rcnt = sizeof (data->pk_chksum);
uuc->tu_state = TUS_GETC;
break;
case TUS_GETC:
/* got entire packet */
if (data->pk_chksum !=
tuchk(*((short *)data), (u_short *)
(data->pk_flag == TUF_DATA ?
(u_short *) uuc->tu_addr : (u_short *)&data->pk_op),
(int)data->pk_mcount))
case TUS_CHKERR:
uuc->tu_cerrs++;
case TUS_GET:
if (data->pk_flag == TUF_DATA) {
/* data packet, advance to next */
uuc->tu_addr += data->pk_mcount;
uuc->tu_count -= data->pk_mcount;
uuc->tu_state = TUS_GETH;
uuc->tu_rbptr = (u_char *)data; /* next packet */
uuc->tu_rcnt = 2;
} else if (data->pk_flag==TUF_CMD && data->pk_op==TUOP_END) {
/* end packet, idle and reenable transmitter */
uuc->tu_state = TUS_IDLE;
uuc->tu_flag = 0;
uuaddr->tcs = UUCS_INTR;
if ((bp = uutab->b_actf) == NULL) {
printf("uu%d: no bp, active %d\n",
data->pk_unit, uitab[ctlr].b_active);
uustart(ui);
return;
}
unit = UNIT(bp->b_dev);
if (data->pk_mod > 1) { /* hard error */
printf("uu%d: hard error bn%d,", unit,
bp->b_blkno);
printf(" pk_mod 0%o\n", data->pk_mod&0xff);
bp->b_flags |= B_ERROR;
uuc->tu_herrs++;
} else if (data->pk_mod) /* soft error */
uuc->tu_serrs++;
uutab->b_active = NULL;
uutab->b_actf = bp->b_actf;
bp->b_resid = uuc->tu_count;
if ((bp->b_flags&B_READ) == 0)
tu_vee(&uu_pcnt[unit]);
iodone(bp);
uustart(ui);
} else {
/*
* Neither data nor end: data was lost
* somehow, flush and restart the transfer.
*/
uuaddr->rcs = 0;
uu_restart(ctlr, ui);
uuc->tu_serrs++;
}
break;
case TUS_IDLE:
case TUS_INIT1:
break;
default:
bad:
if (c == TUF_INITF) {
printf("uu%d protocol error, state=", data->pk_unit);
printstate(uuc->tu_state);
printf(", op=%x, cnt=%d, block=%d\n",
cmd->pk_op, cmd->pk_count, cmd->pk_block);
uutab->b_active = NULL;
if (bp = uutab->b_actf) {
bp->b_flags |= B_ERROR;
uutab->b_actf = bp->b_actf;
if ((bp->b_flags&B_READ) == 0)
tu_vee(&uu_pcnt[unit]);
iodone(bp);
}
uuc->tu_state = TUS_INIT1;
} else {
printf("uu%d receive state error, state=",
data->pk_unit);
printstate(uuc->tu_state);
printf(", byte=%x\n", c & 0xff);
#ifdef notdef
uuc->tu_state = TUS_INIT1;
#endif
wakeup((caddr_t)uuc);
}
}
}
/*
* TU58 transmitter interrupt
*/
uuxintr(ctlr)
int ctlr;
{
register struct uu_softc *uuc = &uu_softc[ctlr];
register struct uudevice *uuaddr;
register struct packet *data;
struct uba_device *ui = uudinfo[ctlr];
int c;
data = &uudata[ctlr];
uuaddr = (struct uudevice *) ui->ui_addr;
top:
if (uuc->tu_wcnt > 0) {
/* still stuff to send, send one byte */
while ((uuaddr->tcs & UUCS_READY) == 0)
;
uuaddr->tdb = *uuc->tu_wbptr++;
uuc->tu_wcnt--;
return;
}
/*
* Last message byte was sent out.
* Switch on tu_state of transfer.
*/
switch(uuc->tu_state) {
/*
* Two nulls have been sent, remove break, and send inits
*/
case TUS_INIT1:
uuc->tu_flag = 0;
uuaddr->tcs = UUCS_INTR;
uuc->tu_state = TUS_INIT2;
uuc->tu_wbptr = uuinit;
uuc->tu_wcnt = sizeof (uuinit);
goto top;
/*
* Inits have been sent, wait for a continue msg.
*/
case TUS_INIT2:
c = uuaddr->rdb; /* prevent overrun error */
uuaddr->rcs = UUCS_INTR;
uuc->tu_flag = 1;
break;
/*
* Read cmd packet sent, get ready for data
*/
case TUS_SENDR:
uuc->tu_state = TUS_GETH;
uuc->tu_rbptr = (u_char *)data;
uuc->tu_rcnt = 2;
uuc->tu_flag = 1;
uuaddr->tcs = 0;
uuaddr->rcs = UUCS_INTR;
break;
/*
* Write cmd packet sent, wait for continue
*/
case TUS_SENDW:
uuc->tu_state = TUS_WAIT;
uuc->tu_flag = 1;
if ((uuaddr->rcs&UUCS_INTR) == 0) {
printf("NO IE\n");
uuaddr->rcs = UUCS_INTR;
}
break;
/*
* Header sent, send data.
*/
case TUS_SENDH:
uuc->tu_state = TUS_SENDD;
uuc->tu_wbptr = (u_char *)uuc->tu_addr;
uuc->tu_wcnt = data->pk_mcount;
goto top;
/*
* Data sent, follow with checksum.
*/
case TUS_SENDD:
uuc->tu_state = TUS_SENDC;
uuc->tu_wbptr = (u_char *)&data->pk_chksum;
uuc->tu_wcnt = 2;
goto top;
/*
* Checksum sent, wait for continue.
*/
case TUS_SENDC:
/*
* Update buffer address and count.
*/
uuc->tu_addr += data->pk_mcount;
uuc->tu_count -= data->pk_mcount;
if (uuc->tu_count > 0) {
uuc->tu_state = TUS_WAIT;
uuc->tu_flag = 1;
break;
}
/*
* End of transmission, get ready for end packet.
*/
uuc->tu_state = TUS_GET;
uuc->tu_rbptr = (u_char *)data;
uuc->tu_rcnt = sizeof (*data);
uuc->tu_flag = 1;
uuaddr->tcs = 0;
break;
/*
* Random interrupt
*/
case TUS_IDLE: /* stray interrupt? */
default:
break;
}
}
uuwatch()
{
register struct uu_softc *uuc;
register struct uudevice *uuaddr;
struct uba_device *ui;
struct buf *bp, *uutab;
int s, ctlr, active = 0;
for (ctlr=0; ctlr<NUU; ctlr++) {
int i;
uuc = &uu_softc[ctlr];
if (uuc->tu_dopen[0] || uuc->tu_dopen[1])
active++;
if (uuc->tu_flag == 0)
/*
* If no read is in progress
* just skip
*/
continue;
ui = uudinfo[ctlr];
uuaddr = (struct uudevice *)ui->ui_addr;
uutab = &uitab[ctlr];
if (uuc->tu_flag++ < 40)
continue;
printf("uu%d: read stalled\n", uudata[ctlr].pk_unit);
#ifdef UUDEBUG
printf("%X %X %X %X %X %X %X\n", uuc->tu_rbptr, uuc->tu_rcnt,
uuc->tu_wbptr, uuc->tu_wcnt, uuc->tu_state, uuc->tu_addr,
uuc->tu_count);
#endif
s = splx(UUIPL);
uuc->tu_flag = 0;
i = uuaddr->rdb; /* dummy */
uuaddr->rcs = UUCS_INTR; /* in case we were flushing */
uuaddr->tcs = UUCS_INTR;
uuc->tu_state = TUS_IDLE;
if (!uutab->b_active) {
wakeup((caddr_t)uuc);
goto retry;
}
if (++uutab->b_errcnt <= 1) {
uustart(ui);
goto retry;
}
if (bp = uutab->b_actf) {
bp->b_flags |= B_ERROR;
if ((bp->b_flags&B_READ) == 0)
tu_vee(&uu_pcnt[UNIT(bp->b_dev)]);
iodone(bp);
}
retry:
(void) splx(s);
}
if (active)
timeout(uuwatch, (caddr_t)0, hz);
else
uuwstart = 0;
return;
}
#if !defined(VAX750) && !defined(VAX730)
/*
* Compute checksum TU58 fashion
*/
#ifdef lint
tuchk(word, cp, n)
register word;
register unsigned short *cp;
int n;
{
register int c = n >> 1;
register long temp;
do {
temp = *cp++; /* temp, only because vax cc won't *r++ */
word += temp;
} while (--c > 0);
if (n & 1)
word += *(unsigned char *)cp;
while (word & 0xffff0000)
word = (word & 0xffff) + ((word >> 16) & 0xffff);
return (word);
}
#else
tuchk(word0, wp, n)
register int word0; /* r11 */
register char *wp; /* r10 */
register int n; /* r9 */
{
asm("loop:");
asm(" addw2 (r10)+,r11"); /* add a word to sum */
asm(" adwc $0,r11"); /* add in carry, end-around */
asm(" acbl $2,$-2,r9,loop"); /* done yet? */
asm(" blbc r9,ok"); /* odd byte count? */
asm(" movzbw (r10),r10"); /* yes, get last byte */
asm(" addw2 r10,r11"); /* add it in */
asm(" adwc $0,r11"); /* and the carry */
asm("ok:");
asm(" movl r11,r0"); /* return sum */
}
#endif
/*
* Make sure this incredibly slow device
* doesn't eat up all the buffers in the
* system by putting the requesting process
* (remember: this device is 'single-user')
* to sleep if the write-behind queue grows
* larger than NUUQ.
*/
tu_pee(cp)
char *cp;
{
register int s;
s = splx(UUIPL);
if (++(*cp) > NUUQ)
sleep(cp, PRIBIO);
splx(s);
}
tu_vee(cp)
char *cp;
{
register int s;
s = splx(UUIPL);
if (--(*cp) <= NUUQ)
wakeup(cp);
splx(s);
}
#endif
uuioctl(dev, cmd, data, flag)
dev_t dev;
caddr_t data;
{
/*
* add code to wind/rewind cassette here
*/
return (ENXIO);
}
uu_restart(ctlr, ui)
int ctlr;
struct uba_device *ui;
{
uureset(ctlr);
timeout(uustart, (caddr_t)ui, hz * 3);
}
#endif
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.