NetBSD/sys/arch/pc532/dev/lpt.c

844 lines
21 KiB
C

/* $NetBSD: lpt.c,v 1.4 1995/06/26 23:13:54 phil Exp $ */
/*
* Copyright (c) 1994 Matthias Pfaller.
* Copyright (c) 1994 Poul-Henning Kamp
* Copyright (c) 1993, 1994 Charles Hannum.
* Copyright (c) 1990 William F. Jolitz, TeleMuse
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This software is a component of "386BSD" developed by
* William F. Jolitz, TeleMuse.
* 4. Neither the name of the developer nor the name "386BSD"
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
* NOT MAKE USE OF THIS WORK.
*
* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``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 DEVELOPER 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.
*
*/
/*
* Device Driver for Matthias's parallel printer port.
* This driver is based on the i386 lpt driver and
* some IP code from Poul-Henning Kamp.
*/
#include "lpt.h"
#if NLPT > 0
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/buf.h>
#include <sys/kernel.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <sys/device.h>
#include <sys/syslog.h>
#include <sys/malloc.h>
#if defined(INET) && defined(PLIP)
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#endif
#include <machine/cpu.h>
#include <sys/device.h>
#include "lptreg.h"
#define LPT_INVERT (LPC_NBUSY|LPC_NERROR|LPC_NACK|LPC_ONLINE)
#define LPT_MASK (LPC_NBUSY|LPC_NERROR|LPC_NACK|LPC_NOPAPER|LPC_ONLINE)
#define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */
#define STEP hz/4
#define LPTPRI (PZERO+8)
#define LPT_BSIZE 1024
#if defined(INET) && defined(PLIP)
#ifndef PLIPMTU /* MTU for the plip# interfaces */
#if defined(COMPAT_PLIP10)
#define PLIPMTU 1600
#else
#define PLIPMTU (ETHERMTU - ifp->if_hdrlen)
#endif
#endif
#ifndef PLIPMXSPIN1 /* DELAY factor for the plip# interfaces */
#define PLIPMXSPIN1 2000 /* Spinning for remote intr to happen */
#endif
#ifndef PLIPMXSPIN2 /* DELAY factor for the plip# interfaces */
#define PLIPMXSPIN2 6000 /* Spinning for remote handshake to happen */
#endif
#ifndef PLIPMXERRS /* Max errors before !RUNNING */
#define PLIPMXERRS 20
#endif
#ifndef PLIPMXRETRY
#define PLIPMXRETRY 20 /* Max number of retransmits */
#endif
#ifndef PLIPRETRY
#define PLIPRETRY hz/50 /* Time between retransmits */
#endif
#endif
struct lpt_softc {
struct device sc_dev;
size_t sc_count;
u_char *sc_inbuf;
u_char *sc_cp;
volatile struct i8255 *sc_i8255;
int sc_irq;
u_char sc_state;
u_char sc_status;
#define LPT_OPEN 0x01 /* device is open */
#define LPT_INIT 0x02 /* waiting to initialize for open */
u_char sc_flags;
#define LPT_AUTOLF 0x20 /* automatic LF on CR */
#define LPT_NOPRIME 0x40 /* don't prime on open */
#if defined(INET) && defined(PLIP)
struct arpcom sc_arpcom;
u_char *sc_ifbuf;
int sc_ifierrs; /* consecutive input errors */
int sc_ifoerrs; /* consecutive output errors */
#if defined(COMPAT_PLIP10)
u_char sc_adrcksum;
#endif
#endif
};
#define LPTUNIT(s) (minor(s) & 0x1f)
#define LPTFLAGS(s) (minor(s) & 0xe0)
static int lptmatch(struct device *, void *, void *aux);
static void lptattach(struct device *, struct device *, void *);
static void lptintr(struct lpt_softc *);
static int notready(u_char, struct lpt_softc *);
static void lptout(void *arg);
static int pushbytes(struct lpt_softc *);
#if defined(INET) && defined(PLIP)
/* Functions for the plip# interface */
static void plipattach(struct lpt_softc *,int);
static int plipioctl(struct ifnet *, u_long, caddr_t);
static void plipstart(struct ifnet *);
static void plipintr(struct lpt_softc *);
#endif
struct cfdriver lptcd = {
NULL,
"lpt",
lptmatch,
lptattach,
DV_TTY,
sizeof(struct lpt_softc),
NULL,
0
};
lptmatch(struct device *parent, void *cf, void *aux)
{
volatile struct i8255 *i8255 =
(volatile struct i8255 *)((struct cfdata *)cf)->cf_loc[0];
int unit = ((struct cfdata *)cf)->cf_unit;
if (unit >= LPT_MAX)
return(0);
if ((int) i8255 == -1)
i8255 = LPT_ADR(unit);
i8255->port_control = LPT_PROBE_MODE;
i8255->port_control = LPT_PROBE_CLR;
if ((i8255->port_c & LPT_PROBE_MASK) != 0)
return 0;
i8255->port_control = LPT_PROBE_SET;
if ((i8255->port_c & LPT_PROBE_MASK) == 0)
return 0;
i8255->port_control = LPT_PROBE_CLR;
if ((i8255->port_c & LPT_PROBE_MASK) != 0)
return 0;
i8255->port_control = LPT_MODE;
i8255->port_a = LPA_ACTIVE | LPA_NPRIME;
return 1;
}
void
lptattach(struct device *parent, struct device *self, void *aux)
{
struct lpt_softc *sc = (struct lpt_softc *) self;
volatile struct i8255 *i8255 =
(volatile struct i8255 *)self->dv_cfdata->cf_loc[0];
if ((sc->sc_irq = self->dv_cfdata->cf_loc[1]) == -1)
sc->sc_irq = LPT_IRQ(self->dv_unit);
if ((int)i8255 == -1)
i8255 = LPT_ADR(self->dv_unit);
i8255->port_control = LPT_MODE;
i8255->port_a = LPA_ACTIVE | LPA_NPRIME;
i8255->port_control = LPT_IRQDISABLE;
sc->sc_state = 0;
sc->sc_i8255 = i8255;
#if defined(INET) && defined(PLIP)
plipattach(sc, self->dv_unit);
intr_establish(sc->sc_irq, lptintr, sc, "lpt", IPL_NET, FALLING_EDGE);
#else
intr_establish(sc->sc_irq, lptintr, sc, "lpt", IPL_NONE, FALLING_EDGE);
#endif
printf(" addr 0x%x, irq %d\n", (int) i8255, sc->sc_irq);
}
/*
* Reset the printer, then wait until it's selected and not busy.
*/
int
lptopen(dev_t dev, int flag)
{
struct lpt_softc *sc = (struct lpt_softc *) lptcd.cd_devs[LPTUNIT(dev)];
volatile struct i8255 *i8255 = sc->sc_i8255;
u_char flags = LPTFLAGS(dev);
int error;
int spin;
if (LPTUNIT(dev) >= NLPT || !sc)
return ENXIO;
if (sc->sc_state || (sc->sc_arpcom.ac_if.if_flags & IFF_UP))
return EBUSY;
sc->sc_state = LPT_INIT;
sc->sc_flags = flags;
if ((flags & LPT_NOPRIME) == 0) {
/* assert INIT for 100 usec to start up printer */
i8255->port_a &= ~LPA_NPRIME;
DELAY(100);
}
if (flags & LPT_AUTOLF)
i8255->port_a |= LPA_ALF | LPA_SELECT | LPA_NPRIME;
else
i8255->port_a = (i8255->port_a & ~LPA_ALF)
| LPA_SELECT | LPA_NPRIME;
/* wait till ready (printer running diagnostics) */
for (spin = 0; notready(i8255->port_c, sc); spin += STEP) {
if (spin >= TIMEOUT) {
sc->sc_state = 0;
return EBUSY;
}
/* wait 1/4 second, give up if we get a signal */
if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen",
STEP) != EWOULDBLOCK) {
sc->sc_state = 0;
return error;
}
}
sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK);
sc->sc_status =
sc->sc_count = 0;
sc->sc_state = LPT_OPEN;
return 0;
}
int
notready(u_char status, struct lpt_softc *sc)
{
status ^= LPT_INVERT;
if (status != sc->sc_status) {
if (status & LPC_NOPAPER)
log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname);
if (status & LPC_ONLINE)
log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname);
if (status & LPC_NERROR)
log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname);
if (status & LPC_NACK)
log(LOG_NOTICE, "%s: NACK low\n", sc->sc_dev.dv_xname);
if (status & LPC_NBUSY)
log(LOG_NOTICE, "%s: NBUSY low\n", sc->sc_dev.dv_xname);
sc->sc_status = status;
}
return status & LPT_MASK;
}
void
lptout(void *arg)
{
struct lpt_softc *sc = (struct lpt_softc *) arg;
if (sc->sc_count > 0)
sc->sc_i8255->port_control = LPT_IRQENABLE;
}
/*
* Close the device, and free the local line buffer.
*/
lptclose(dev_t dev, int flag)
{
struct lpt_softc *sc = (struct lpt_softc *) lptcd.cd_devs[LPTUNIT(dev)];
if (sc->sc_count)
(void) pushbytes(sc);
sc->sc_i8255->port_control = LPT_IRQDISABLE;
sc->sc_state = 0;
free(sc->sc_inbuf, M_DEVBUF);
return 0;
}
int
pushbytes(struct lpt_softc *sc)
{
volatile struct i8255 *i8255 = sc->sc_i8255;
int error;
while (sc->sc_count > 0) {
i8255->port_control = LPT_IRQENABLE;
if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
"lptwrite", 0))
return error;
}
return 0;
}
/*
* Copy a line from user space to a local buffer, then call pushbytes to
* get the chars moved to the output queue.
*/
lptwrite(dev_t dev, struct uio *uio)
{
struct lpt_softc *sc = (struct lpt_softc *) lptcd.cd_devs[LPTUNIT(dev)];
size_t n;
int error = 0;
if (sc->sc_count) return EBUSY;
while (n = min(LPT_BSIZE, uio->uio_resid)) {
uiomove(sc->sc_cp = sc->sc_inbuf, n, uio);
sc->sc_count = n;
error = pushbytes(sc);
if (error) {
/*
* Return accurate residual if interrupted or timed
* out.
*/
uio->uio_resid += sc->sc_count;
sc->sc_count = 0;
return error;
}
}
return 0;
}
/*
* Handle printer interrupts which occur when the printer is ready to accept
* another char.
*/
void
lptintr(struct lpt_softc *sc)
{
volatile struct i8255 *i8255 = sc->sc_i8255;
#if defined(INET) && defined(PLIP)
if(sc->sc_arpcom.ac_if.if_flags & IFF_UP) {
plipintr(sc);
return;
}
#endif
if ((sc->sc_state & LPT_OPEN) == 0) {
i8255->port_control = LPT_IRQDISABLE;
return;
}
if (sc->sc_count) {
/* is printer online and ready for output? */
if (notready(i8255->port_c, sc)) {
i8255->port_control = LPT_IRQDISABLE;
timeout(lptout, sc, STEP);
return;
}
/* send char */
i8255->port_a &= ~LPA_ACTIVE;
i8255->port_b = *sc->sc_cp++;
i8255->port_a |= LPA_ACTIVE;
sc->sc_count--;
}
if (sc->sc_count == 0) {
/* none, wake up the top half to get more */
i8255->port_control = LPT_IRQDISABLE;
wakeup((caddr_t)sc);
}
}
int
lptioctl(dev_t dev, int cmd, caddr_t data, int flag)
{
int error = 0;
switch (cmd) {
default:
error = EINVAL;
}
return error;
}
#if defined(INET) && defined(PLIP)
static void
plipattach(struct lpt_softc *sc, int unit)
{
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
sc->sc_ifbuf = NULL;
ifp->if_unit = unit;
ifp->if_name = "plip";
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;
ifp->if_output = ether_output;
ifp->if_start = plipstart;
ifp->if_ioctl = plipioctl;
ifp->if_watchdog = 0;
ifp->if_type = IFT_ETHER;
ifp->if_addrlen = 6;
ifp->if_hdrlen = 14;
ifp->if_mtu = PLIPMTU;
if_attach(ifp);
}
/*
* Process an ioctl request.
*/
static int
plipioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct proc *p = curproc;
struct lpt_softc *sc = (struct lpt_softc *) lptcd.cd_devs[ifp->if_unit];
volatile struct i8255 *i8255 = sc->sc_i8255;
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
int s;
int error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
if (((ifp->if_flags & IFF_UP) == 0) &&
(ifp->if_flags & IFF_RUNNING)) {
ifp->if_flags &= ~IFF_RUNNING;
sc->sc_i8255->port_control = LPT_MODE;
i8255->port_a = LPA_ACTIVE | LPA_NPRIME;
if (sc->sc_ifbuf)
free(sc->sc_ifbuf, M_DEVBUF);
sc->sc_ifbuf = NULL;
}
if (((ifp->if_flags & IFF_UP)) &&
((ifp->if_flags & IFF_RUNNING) == 0)) {
if (sc->sc_state) {
error = EBUSY;
break;
}
if (!sc->sc_ifbuf)
sc->sc_ifbuf =
malloc(ifp->if_mtu + ifp->if_hdrlen,
M_DEVBUF, M_WAITOK);
ifp->if_flags |= IFF_RUNNING;
sc->sc_i8255->port_control = LPT_IRQDISABLE;
sc->sc_i8255->port_b = 0;
sc->sc_i8255->port_a |= LPA_ACKENABLE;
}
break;
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family == AF_INET) {
if (!sc->sc_ifbuf)
sc->sc_ifbuf =
malloc(PLIPMTU + ifp->if_hdrlen,
M_DEVBUF, M_WAITOK);
sc->sc_arpcom.ac_enaddr[0] = 0xfc;
sc->sc_arpcom.ac_enaddr[1] = 0xfc;
bcopy((caddr_t)&IA_SIN(ifa)->sin_addr,
(caddr_t)&sc->sc_arpcom.ac_enaddr[2], 4);
sc->sc_arpcom.ac_ipaddr = IA_SIN(ifa)->sin_addr;
#if defined(COMPAT_PLIP10)
if (ifp->if_flags & IFF_LINK0) {
int i;
sc->sc_arpcom.ac_enaddr[0] = 0xfd;
sc->sc_arpcom.ac_enaddr[1] = 0xfd;
for (i = sc->sc_adrcksum = 0; i < 5; i++)
sc->sc_adrcksum += sc->sc_arpcom.ac_enaddr[i];
sc->sc_adrcksum *= 2;
}
#endif
ifp->if_flags |= IFF_RUNNING | IFF_UP;
#if 0
for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
struct sockaddr_dl *sdl;
if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
sdl->sdl_family == AF_LINK) {
sdl->sdl_type = IFT_ETHER;
sdl->sdl_alen = ifp->if_addrlen;
bcopy((caddr_t)((struct arpcom *)ifp)->ac_enaddr,
LLADDR(sdl), ifp->if_addrlen);
break;
}
}
#endif
sc->sc_i8255->port_control = LPT_IRQDISABLE;
sc->sc_i8255->port_b = 0;
sc->sc_i8255->port_a |= LPA_ACKENABLE;
arp_ifinit(&sc->sc_arpcom, ifa);
} else
error = EAFNOSUPPORT;
break;
case SIOCAIFADDR:
case SIOCDIFADDR:
case SIOCSIFDSTADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
error = EAFNOSUPPORT;
break;
case SIOCSIFMTU:
if ((error = suser(p->p_ucred, &p->p_acflag)))
return(error);
if (ifp->if_mtu != ifr->ifr_metric) {
ifp->if_mtu = ifr->ifr_metric;
if (sc->sc_ifbuf) {
s = splimp();
free(sc->sc_ifbuf, M_DEVBUF);
sc->sc_ifbuf =
malloc(ifp->if_mtu + ifp->if_hdrlen,
M_DEVBUF, M_WAITOK);
splx(s);
}
}
break;
case SIOCGIFMTU:
ifr->ifr_metric = ifp->if_mtu;
break;
default:
error = EINVAL;
}
return (error);
}
static int
plipreceive(volatile struct i8255 *i8255, u_char *buf, int len)
{
int i;
u_char cksum = 0, c;
while (len--) {
i = PLIPMXSPIN2;
while ((i8255->port_c & LPC_NBUSY) != 0)
if (i-- < 0) return -1;
c = i8255->port_c >> 4;
i8255->port_b = 0x11;
while ((i8255->port_c & LPC_NBUSY) == 0)
if (i-- < 0) return -1;
c |= i8255->port_c & 0xf0;
i8255->port_b = 0x01;
cksum += (*buf++ = c);
}
return(cksum);
}
static void
plipintr(struct lpt_softc *sc)
{
extern struct mbuf *m_devget(char *, int, int, struct ifnet *, void (*)());
struct ifnet *ifp = &sc->sc_arpcom.ac_if;
volatile struct i8255 *i8255 = sc->sc_i8255;
struct mbuf *m;
struct ether_header *eh;
u_char *p = sc->sc_ifbuf, minibuf[4];
int c, i = 0, s, len, cksum;
i8255->port_a &= ~(LPA_ACKENABLE | LPA_ACTIVE);
i8255->port_b = 0x01;
#if defined(COMPAT_PLIP10)
if (ifp->if_flags & IFF_LINK0) {
if (plipreceive(i8255, minibuf, 3) < 0) goto err;
len = (minibuf[1] << 8) | minibuf[2];
if (len > (ifp->if_mtu + ifp->if_hdrlen)) goto err;
switch (minibuf[0]) {
case 0xfc:
p[0] = p[ 6] = ifp->ac_enaddr[0];
p[1] = p[ 7] = ifp->ac_enaddr[1];
p[2] = p[ 8] = ifp->ac_enaddr[2];
p[3] = p[ 9] = ifp->ac_enaddr[3];
p[4] = p[10] = ifp->ac_enaddr[4];
p += 5;
if ((cksum = plipreceive(i8255, p, 1)) < 0) goto err;
p += 6;
if ((c = plipreceive(i8255, p, len - 11)) < 0) goto err;
cksum += c + sc->sc_adrcksum;
c = p[1]; p[1] = p[2]; p[2] = c;
cksum &= 0xff;
break;
case 0xfd:
if ((cksum = plipreceive(i8255, p, len)) < 0) goto err;
break;
default:
goto err;
}
} else
#endif
{
if (plipreceive(i8255, minibuf, 2) < 0) goto err;
len = (minibuf[1] << 8) | minibuf[0];
if (len > (ifp->if_mtu + ifp->if_hdrlen)) {
log(LOG_NOTICE, "plip%d: packet > MTU\n", ifp->if_unit);
goto err;
}
if ((cksum = plipreceive(i8255, p, len)) < 0) goto err;
}
if (plipreceive(i8255, minibuf, 1) < 0) goto err;
if (cksum != minibuf[0]) {
log(LOG_NOTICE, "plip%d: checksum error\n", ifp->if_unit);
goto err;
}
i8255->port_b = 0x00;
s = splimp();
if (m = m_devget(sc->sc_ifbuf, len, 0, ifp, NULL)) {
/* We assume that the header fit entirely in one mbuf. */
eh = mtod(m, struct ether_header *);
m->m_pkthdr.len -= sizeof(*eh);
m->m_len -= sizeof(*eh);
m->m_data += sizeof(*eh);
ether_input(ifp, eh, m);
}
splx(s);
sc->sc_ifierrs = 0;
ifp->if_ipackets++;
i8255->port_a |= LPA_ACKENABLE | LPA_ACTIVE;
return;
err:
i8255->port_b = 0x00;
if (sc->sc_ifierrs < PLIPMXERRS) {
if (sc->sc_ifierrs > 4 && (i8255->port_c & LPC_NBUSY)) {
/* Avoid interrupt nesting ... */
sc->sc_ifierrs = PLIPMXERRS - 1;
}
i8255->port_a |= LPA_ACKENABLE | LPA_ACTIVE;
} else {
/* We are not able to send receive anything for now,
* so stop wasting our time and leave the interrupt
* disabled.
*/
if (sc->sc_ifierrs == PLIPMXERRS)
log(LOG_NOTICE, "plip%d: rx hard error\n", ifp->if_unit);
i8255->port_a |= LPA_ACTIVE;
}
ifp->if_ierrors++;
sc->sc_ifierrs++;
return;
}
static int
pliptransmit(volatile struct i8255 *i8255, u_char *buf, int len)
{
int i;
u_char cksum = 0, c;
while (len--) {
i = PLIPMXSPIN2;
cksum += (c = *buf++);
while ((i8255->port_c & LPC_NBUSY) == 0)
if (i-- < 0) return -1;
i8255->port_b = c & 0x0f;
i8255->port_b = c & 0x0f | 0x10;
c >>= 4;
while ((i8255->port_c & LPC_NBUSY) != 0)
if (i-- < 0) return -1;
i8255->port_b = c | 0x10;
i8255->port_b = c;
}
return(cksum);
}
/*
* Setup output on interface.
*/
static void
plipstart(struct ifnet *ifp)
{
struct lpt_softc *sc = (struct lpt_softc *) lptcd.cd_devs[ifp->if_unit];
volatile struct i8255 *i8255 = sc->sc_i8255;
struct mbuf *m0, *m;
u_char minibuf[4], cksum;
int len, i, s;
if (ifp->if_flags & IFF_OACTIVE)
return;
ifp->if_flags |= IFF_OACTIVE;
if (sc->sc_ifoerrs)
untimeout((void (*)(void *))plipstart, ifp);
i8255->port_a &= ~LPA_ACTIVE;
for (;;) {
s = splimp();
IF_DEQUEUE(&ifp->if_snd, m0);
splx(s);
if (!m0)
break;
for (len = 0, m = m0; m; m = m->m_next)
len += m->m_len;
#if defined(COMPAT_PLIP10)
if (ifp->if_flags & IFF_LINK0) {
minibuf[0] = 3;
minibuf[1] = 0xfd;
minibuf[2] = len >> 8;
minibuf[3] = len;
} else
#endif
{
minibuf[0] = 2;
minibuf[1] = len;
minibuf[2] = len >> 8;
}
for (i = PLIPMXSPIN1; (i8255->port_c & LPC_NERROR) != 0; i--)
if (i < 0) goto retry;
/* Trigger remote interrupt */
i8255->port_a &= ~LPA_ACKENABLE;
i8255->port_b = 0x08;
for (i = PLIPMXSPIN1; (i8255->port_c & LPC_NERROR) == 0; i--)
if (i < 0 || (i > PLIPMXSPIN1/3
&& i8255->port_c & LPC_NACK))
goto retry;
if (pliptransmit(i8255, minibuf + 1, minibuf[0]) < 0) goto retry;
for (cksum = 0, m = m0; m; m = m->m_next) {
i = pliptransmit(i8255, mtod(m, u_char *), m->m_len);
if (i < 0) goto retry;
cksum += i;
}
if (pliptransmit(i8255, &cksum, 1) < 0) goto retry;
i = PLIPMXSPIN2;
while ((i8255->port_c & LPC_NBUSY) == 0)
if (i-- < 0) goto retry;
i8255->port_b = 0x00;
ifp->if_opackets++;
ifp->if_obytes += len + 4;
sc->sc_ifoerrs = 0;
s = splimp();
m_freem(m0);
splx(s);
i8255->port_a |= LPA_ACKENABLE;
}
i8255->port_a |= LPA_ACTIVE;
ifp->if_flags &= ~IFF_OACTIVE;
return;
retry:
if (i8255->port_c & LPC_NACK)
ifp->if_collisions++;
else
ifp->if_oerrors++;
if ((ifp->if_flags & (IFF_RUNNING | IFF_UP)) == (IFF_RUNNING | IFF_UP)
&& sc->sc_ifoerrs < PLIPMXRETRY) {
s = splimp();
IF_PREPEND(&ifp->if_snd, m0);
splx(s);
timeout((void (*)(void *))plipstart, ifp, PLIPRETRY);
} else {
if (sc->sc_ifoerrs == PLIPMXRETRY) {
log(LOG_NOTICE, "plip%d: tx hard error\n", ifp->if_unit);
}
s = splimp();
m_freem(m0);
splx(s);
}
sc->sc_ifoerrs++;
ifp->if_flags &= ~IFF_OACTIVE;
i8255->port_b = 0x00;
if (sc->sc_ifierrs >= PLIPMXERRS)
i8255->port_a |= LPA_ACTIVE;
else
i8255->port_a |= LPA_ACKENABLE | LPA_ACTIVE;
return;
}
#endif
#endif