/* $NetBSD: par.c,v 1.41 2018/09/03 16:29:22 riastradh Exp $ */
/*
* Copyright (c) 1982, 1990 The Regents of the University of California.
* All rights reserved.
*
* 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.
* 3. 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.
*
* @(#)ppi.c 7.3 (Berkeley) 12/16/90
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: par.c,v 1.41 2018/09/03 16:29:22 riastradh Exp $");
/*
* parallel port interface
*/
#include "par.h"
#if NPAR > 0
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/file.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <amiga/amiga/device.h>
#include <amiga/amiga/cia.h>
#include <amiga/dev/parioctl.h>
struct par_softc {
device_t sc_dev;
int sc_flags;
struct parparam sc_param;
#define sc_burst sc_param.burst
#define sc_timo sc_param.timo
#define sc_delay sc_param.delay
struct callout sc_timo_ch;
struct callout sc_start_ch;
} *par_softcp;
#define getparsp(x) (x > 0 ? NULL : par_softcp)
/* sc_flags values */
#define PARF_ALIVE 0x01
#define PARF_OPEN 0x02
#define PARF_UIO 0x04
#define PARF_TIMO 0x08
#define PARF_DELAY 0x10
#define PARF_OREAD 0x40
#define PARF_OWRITE 0x80
#define UNIT(x) minor(x)
#ifdef DEBUG
int pardebug = 0;
#define PDB_FOLLOW 0x01
#define PDB_IO 0x02
#define PDB_INTERRUPT 0x04
#define PDB_NOCHECK 0x80
#endif
int parrw(dev_t, struct uio *);
int parhztoms(int);
int parmstohz(int);
int parsend(u_char *, int);
int parreceive(u_char *, int);
int parsendch(u_char);
void partimo(void *);
void parstart(void *);
void parintr(void *);
void parattach(device_t, device_t, void *);
int parmatch(device_t, cfdata_t, void *);
CFATTACH_DECL_NEW(par, sizeof(struct par_softc),
parmatch, parattach, NULL, NULL);
dev_type_open(paropen);
dev_type_close(parclose);
dev_type_read(parread);
dev_type_write(parwrite);
dev_type_ioctl(parioctl);
const struct cdevsw par_cdevsw = {
.d_open = paropen,
.d_close = parclose,
.d_read = parread,
.d_write = parwrite,
.d_ioctl = parioctl,
.d_stop = nostop,
.d_tty = notty,
.d_poll = nopoll,
.d_mmap = nommap,
.d_kqfilter = nokqfilter,
.d_discard = nodiscard,
.d_flag = 0
};
/*ARGSUSED*/
int
parmatch(device_t parent, cfdata_t cf, void *aux)
{
static int par_found = 0;
if (!matchname((char *)aux, "par") || par_found)
return(0);
par_found = 1;
return(1);
}
void
parattach(device_t parent, device_t self, void *aux)
{
par_softcp = device_private(self);
par_softcp->sc_dev = self;
#ifdef DEBUG
if ((pardebug & PDB_NOCHECK) == 0)
#endif
par_softcp->sc_flags = PARF_ALIVE;
printf("\n");
callout_init(&par_softcp->sc_timo_ch, 0);
callout_init(&par_softcp->sc_start_ch, 0);
}
int
paropen(dev_t dev, int flags, int mode, struct lwp *l)
{
int unit = UNIT(dev);
struct par_softc *sc = getparsp(unit);
if (unit >= NPAR || (sc->sc_flags & PARF_ALIVE) == 0)
return(ENXIO);
#ifdef DEBUG
if (pardebug & PDB_FOLLOW) {
printf("paropen(%llx, %x): flags %x, ",
dev, flags, sc->sc_flags);
printf ("port = $%x\n", ((ciab.pra ^ CIAB_PRA_SEL)
& (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
}
#endif
if (sc->sc_flags & PARF_OPEN)
return(EBUSY);
/* can either read or write, but not both */
if ((flags & (FREAD|FWRITE)) == (FREAD|FWRITE))
return EINVAL;
sc->sc_flags |= PARF_OPEN;
if (flags & FREAD)
sc->sc_flags |= PARF_OREAD;
else
sc->sc_flags |= PARF_OWRITE;
sc->sc_burst = PAR_BURST;
sc->sc_timo = parmstohz(PAR_TIMO);
sc->sc_delay = parmstohz(PAR_DELAY);
/* enable interrupts for CIAA-FLG */
ciaa.icr = CIA_ICR_IR_SC | CIA_ICR_FLG;
return(0);
}
int
parclose(dev_t dev, int flags, int mode, struct lwp *l)
{
int unit = UNIT(dev);
struct par_softc *sc = getparsp(unit);
#ifdef DEBUG
if (pardebug & PDB_FOLLOW)
printf("parclose(%llx, %x): flags %x\n",
dev, flags, sc->sc_flags);
#endif
sc->sc_flags &= ~(PARF_OPEN|PARF_OREAD|PARF_OWRITE);
/* don't allow interrupts for CIAA-FLG any longer */
ciaa.icr = CIA_ICR_FLG;
return(0);
}
void
parstart(void *arg)
{
struct par_softc *sc = arg;
#ifdef DEBUG
if (pardebug & PDB_FOLLOW)
printf("parstart(%x)\n", device_unit(sc->sc_dev));
#endif
sc->sc_flags &= ~PARF_DELAY;
wakeup(sc);
}
void
partimo(void *arg)
{
struct par_softc *sc = arg;
#ifdef DEBUG
if (pardebug & PDB_FOLLOW)
printf("partimo(%x)\n", device_unit(sc->sc_dev));
#endif
sc->sc_flags &= ~(PARF_UIO|PARF_TIMO);
wakeup(sc);
}
int
parread(dev_t dev, struct uio *uio, int flags)
{
#ifdef DEBUG
if (pardebug & PDB_FOLLOW)
printf("parread(%llx, %p)\n", dev, uio);
#endif
return (parrw(dev, uio));
}
int
parwrite(dev_t dev, struct uio *uio, int flags)
{
#ifdef DEBUG
if (pardebug & PDB_FOLLOW)
printf("parwrite(%llx, %p)\n", dev, uio);
#endif
return (parrw(dev, uio));
}
int
parrw(dev_t dev, register struct uio *uio)
{
int unit = UNIT(dev);
register struct par_softc *sc = getparsp(unit);
register int s, len, cnt;
register char *cp;
int error = 0, gotdata = 0;
int buflen;
char *buf;
len = 0;
cnt = 0;
if (!!(sc->sc_flags & PARF_OREAD) ^ (uio->uio_rw == UIO_READ))
return EINVAL;
if (uio->uio_resid == 0)
return(0);
#ifdef DEBUG
if (pardebug & (PDB_FOLLOW|PDB_IO))
printf("parrw(%llx, %p, %c): burst %d, timo %d, resid %x\n",
dev, uio, uio->uio_rw == UIO_READ ? 'R' : 'W',
sc->sc_burst, sc->sc_timo, uio->uio_resid);
#endif
buflen = uimin(sc->sc_burst, uio->uio_resid);
buf = (char *)malloc(buflen, M_DEVBUF, M_WAITOK);
sc->sc_flags |= PARF_UIO;
if (sc->sc_timo > 0)
{
sc->sc_flags |= PARF_TIMO;
callout_reset(&sc->sc_timo_ch, sc->sc_timo, partimo, sc);
}
while (uio->uio_resid > 0)
{
len = uimin(buflen, uio->uio_resid);
cp = buf;
if (uio->uio_rw == UIO_WRITE)
{
error = uiomove(cp, len, uio);
if (error)
break;
}
again:
#if 0
if ((sc->sc_flags & PARF_UIO) && hpibreq(&sc->sc_dq) == 0)
sleep(sc, PRIBIO+1);
#endif
/*
* Check if we timed out during sleep or uiomove
*/
s = splsoftclock();
if ((sc->sc_flags & PARF_UIO) == 0)
{
#ifdef DEBUG
if (pardebug & PDB_IO)
printf("parrw: uiomove/sleep timo, flags %x\n",
sc->sc_flags);
#endif
if (sc->sc_flags & PARF_TIMO)
{
callout_stop(&sc->sc_timo_ch);
sc->sc_flags &= ~PARF_TIMO;
}
splx(s);
break;
}
splx(s);
/*
* Perform the operation
*/
if (uio->uio_rw == UIO_WRITE)
cnt = parsend (cp, len);
else
cnt = parreceive (cp, len);
if (cnt < 0)
{
error = -cnt;
break;
}
s = splbio();
#if 0
hpibfree(&sc->sc_dq);
#endif
#ifdef DEBUG
if (pardebug & PDB_IO)
printf("parrw: %s(%p, %d) -> %d\n",
uio->uio_rw == UIO_READ ? "recv" : "send", cp, len, cnt);
#endif
splx(s);
if (uio->uio_rw == UIO_READ)
{
if (cnt)
{
error = uiomove(cp, cnt, uio);
if (error)
break;
gotdata++;
}
/*
* Didn't get anything this time, but did in the past.
* Consider us done.
*/
else if (gotdata)
break;
}
s = splsoftclock();
/*
* Operation timeout (or non-blocking), quit now.
*/
if ((sc->sc_flags & PARF_UIO) == 0)
{
#ifdef DEBUG
if (pardebug & PDB_IO)
printf("parrw: timeout/done\n");
#endif
splx(s);
break;
}
/*
* Implement inter-read delay
*/
if (sc->sc_delay > 0)
{
sc->sc_flags |= PARF_DELAY;
callout_reset(&sc->sc_start_ch, sc->sc_delay, parstart, sc);
error = tsleep(sc, PCATCH | (PZERO - 1), "par-cdelay", 0);
if (error)
{
splx(s);
break;
}
}
splx(s);
/*
* Must not call uiomove again til we've used all data
* that we already grabbed.
*/
if (uio->uio_rw == UIO_WRITE && cnt != len)
{
cp += cnt;
len -= cnt;
cnt = 0;
goto again;
}
}
s = splsoftclock();
if (sc->sc_flags & PARF_TIMO)
{
callout_stop(&sc->sc_timo_ch);
sc->sc_flags &= ~PARF_TIMO;
}
if (sc->sc_flags & PARF_DELAY)
{
callout_stop(&sc->sc_start_ch);
sc->sc_flags &= ~PARF_DELAY;
}
splx(s);
/*
* Adjust for those chars that we uiomove'ed but never wrote
*/
if (uio->uio_rw == UIO_WRITE && cnt != len)
{
uio->uio_resid += (len - cnt);
#ifdef DEBUG
if (pardebug & PDB_IO)
printf("parrw: short write, adjust by %d\n",
len-cnt);
#endif
}
free(buf, M_DEVBUF);
#ifdef DEBUG
if (pardebug & (PDB_FOLLOW|PDB_IO))
printf("parrw: return %d, resid %d\n", error, uio->uio_resid);
#endif
return (error);
}
int
parioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
struct par_softc *sc = getparsp(UNIT(dev));
struct parparam *pp, *upp;
int error = 0;
switch (cmd)
{
case PARIOCGPARAM:
pp = &sc->sc_param;
upp = (struct parparam *)data;
upp->burst = pp->burst;
upp->timo = parhztoms(pp->timo);
upp->delay = parhztoms(pp->delay);
break;
case PARIOCSPARAM:
pp = &sc->sc_param;
upp = (struct parparam *)data;
if (upp->burst < PAR_BURST_MIN || upp->burst > PAR_BURST_MAX ||
upp->delay < PAR_DELAY_MIN || upp->delay > PAR_DELAY_MAX)
return(EINVAL);
pp->burst = upp->burst;
pp->timo = parmstohz(upp->timo);
pp->delay = parmstohz(upp->delay);
break;
default:
return(EINVAL);
}
return (error);
}
int
parhztoms(int h)
{
extern int hz;
register int m = h;
if (m > 0)
m = m * 1000 / hz;
return(m);
}
int
parmstohz(int m)
{
extern int hz;
register int h = m;
if (h > 0) {
h = h * hz / 1000;
if (h == 0)
h = 1000 / hz;
}
return(h);
}
/* stuff below here if for interrupt driven output of data thru
the parallel port. */
int parsend_pending;
void
parintr(void *arg)
{
int s;
s = splclock();
#ifdef DEBUG
if (pardebug & PDB_INTERRUPT)
printf("parintr\n");
#endif
parsend_pending = 0;
wakeup(parintr);
splx(s);
}
int
parsendch (u_char ch)
{
int error = 0;
int s;
/* if either offline, busy or out of paper, wait for that
condition to clear */
s = splclock();
while (!error
&& (parsend_pending
|| ((ciab.pra ^ CIAB_PRA_SEL)
& (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT))))
{
extern int hz;
#ifdef DEBUG
if (pardebug & PDB_INTERRUPT)
printf ("parsendch, port = $%x\n",
((ciab.pra ^ CIAB_PRA_SEL)
& (CIAB_PRA_SEL|CIAB_PRA_BUSY|CIAB_PRA_POUT)));
#endif
/* this is essentially a flipflop to have us wait for the
first character being transmitted when trying to transmit
the second, etc. */
parsend_pending = 0;
/* it's quite important that a parallel putc can be
interrupted, given the possibility to lock a printer
in an offline condition.. */
error = tsleep(parintr, PCATCH | (PZERO - 1), "parsendch", hz);
if (error == EWOULDBLOCK)
error = 0;
if (error > 0)
{
#ifdef DEBUG
if (pardebug & PDB_INTERRUPT)
printf ("parsendch interrupted, error = %d\n", error);
#endif
}
}
if (! error)
{
#ifdef DEBUG
if (pardebug & PDB_INTERRUPT)
printf ("#%d", ch);
#endif
ciaa.prb = ch;
parsend_pending = 1;
}
splx (s);
return error;
}
int
parsend (u_char *buf, int len)
{
int err, orig_len = len;
/* make sure I/O lines are setup right for output */
/* control lines set to input */
ciab.ddra &= ~(CIAB_PRA_SEL|CIAB_PRA_POUT|CIAB_PRA_BUSY);
/* data lines to output */
ciaa.ddrb = 0xff;
for (; len; len--, buf++)
if ((err = parsendch (*buf)) != 0)
return err < 0 ? -EINTR : -err;
/* either all or nothing.. */
return orig_len;
}
int
parreceive (u_char *buf, int len)
{
/* oh deary me, something's gotta be left to be implemented
later... */
return 0;
}
#endif