3171f081c8
least 1us. Documentation I've found for the simple (SPP) parallel port mode says that data should be stable 500ns before STROBE, STROBE should be pulsed for no less than 500ns, and that data should be stable another 500ns after STROBE has been de-asserted. Makes lpt@ebus on my Sun Ultra5 work with my HP DeskJet 712C, at least in polled mode. Thanks to Martin for astutely noting it was probably a bug with STROBE being pulsed too quickly.
438 lines
10 KiB
C
438 lines
10 KiB
C
/* $NetBSD: lpt.c,v 1.61 2002/12/10 07:19:25 rafal Exp $ */
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/*
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* Copyright (c) 1993, 1994 Charles M. Hannum.
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* Copyright (c) 1990 William F. Jolitz, TeleMuse
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This software is a component of "386BSD" developed by
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* William F. Jolitz, TeleMuse.
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* 4. Neither the name of the developer nor the name "386BSD"
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
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* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
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* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
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* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
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* NOT MAKE USE OF THIS WORK.
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*
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* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
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* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
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* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
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* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
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* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
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* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
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* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
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* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Device Driver for AT style parallel printer port
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.61 2002/12/10 07:19:25 rafal Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/syslog.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <dev/ic/lptreg.h>
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#include <dev/ic/lptvar.h>
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#define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */
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#define STEP hz/4
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#define LPTPRI (PZERO+8)
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#define LPT_BSIZE 1024
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#define LPTDEBUG
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#ifndef LPTDEBUG
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#define LPRINTF(a)
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#else
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#define LPRINTF(a) if (lptdebug) printf a
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int lptdebug = 0;
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#endif
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extern struct cfdriver lpt_cd;
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dev_type_open(lptopen);
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dev_type_close(lptclose);
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dev_type_write(lptwrite);
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dev_type_ioctl(lptioctl);
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const struct cdevsw lpt_cdevsw = {
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lptopen, lptclose, noread, lptwrite, lptioctl,
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nostop, notty, nopoll, nommap, nokqfilter,
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};
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#define LPTUNIT(s) (minor(s) & 0x1f)
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#define LPTFLAGS(s) (minor(s) & 0xe0)
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void
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lpt_attach_subr(sc)
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struct lpt_softc *sc;
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{
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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sc->sc_state = 0;
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iot = sc->sc_iot;
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ioh = sc->sc_ioh;
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bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
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callout_init(&sc->sc_wakeup_ch);
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sc->sc_dev_ok = 1;
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}
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/*
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* Reset the printer, then wait until it's selected and not busy.
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*/
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int
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lptopen(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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u_char flags = LPTFLAGS(dev);
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struct lpt_softc *sc;
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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u_char control;
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int error;
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int spin;
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sc = device_lookup(&lpt_cd, LPTUNIT(dev));
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if (!sc || !sc->sc_dev_ok)
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return ENXIO;
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#if 0 /* XXX what to do? */
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if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0)
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return ENXIO;
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#endif
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#ifdef DIAGNOSTIC
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if (sc->sc_state)
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printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
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sc->sc_state);
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#endif
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if (sc->sc_state)
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return EBUSY;
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sc->sc_state = LPT_INIT;
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sc->sc_flags = flags;
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LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname,
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(unsigned)flags));
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iot = sc->sc_iot;
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ioh = sc->sc_ioh;
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if ((flags & LPT_NOPRIME) == 0) {
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/* assert INIT for 100 usec to start up printer */
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bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT);
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delay(100);
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}
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control = LPC_SELECT | LPC_NINIT;
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bus_space_write_1(iot, ioh, lpt_control, control);
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/* wait till ready (printer running diagnostics) */
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for (spin = 0; NOT_READY_ERR(); spin += STEP) {
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if (spin >= TIMEOUT) {
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sc->sc_state = 0;
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return EBUSY;
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}
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/* wait 1/4 second, give up if we get a signal */
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error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP);
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if (error != EWOULDBLOCK) {
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sc->sc_state = 0;
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return error;
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}
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}
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if ((flags & LPT_NOINTR) == 0)
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control |= LPC_IENABLE;
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if (flags & LPT_AUTOLF)
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control |= LPC_AUTOLF;
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sc->sc_control = control;
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bus_space_write_1(iot, ioh, lpt_control, control);
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sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK);
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sc->sc_count = 0;
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sc->sc_state = LPT_OPEN;
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if ((sc->sc_flags & LPT_NOINTR) == 0)
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lptwakeup(sc);
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LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname));
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return 0;
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}
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int
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lptnotready(status, sc)
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u_char status;
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struct lpt_softc *sc;
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{
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u_char new;
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status = (status ^ LPS_INVERT) & LPS_MASK;
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new = status & ~sc->sc_laststatus;
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sc->sc_laststatus = status;
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if (sc->sc_state & LPT_OPEN) {
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if (new & LPS_SELECT)
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log(LOG_NOTICE,
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"%s: offline\n", sc->sc_dev.dv_xname);
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else if (new & LPS_NOPAPER)
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log(LOG_NOTICE,
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"%s: out of paper\n", sc->sc_dev.dv_xname);
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else if (new & LPS_NERR)
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log(LOG_NOTICE,
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"%s: output error\n", sc->sc_dev.dv_xname);
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}
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return status;
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}
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void
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lptwakeup(arg)
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void *arg;
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{
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struct lpt_softc *sc = arg;
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int s;
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s = spllpt();
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lptintr(sc);
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splx(s);
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callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc);
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}
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/*
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* Close the device, and free the local line buffer.
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*/
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int
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lptclose(dev, flag, mode, p)
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dev_t dev;
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int flag;
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int mode;
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struct proc *p;
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{
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struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev));
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bus_space_tag_t iot = sc->sc_iot;
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bus_space_handle_t ioh = sc->sc_ioh;
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if (sc->sc_count)
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(void) lptpushbytes(sc);
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if ((sc->sc_flags & LPT_NOINTR) == 0)
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callout_stop(&sc->sc_wakeup_ch);
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bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
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sc->sc_state = 0;
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bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
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free(sc->sc_inbuf, M_DEVBUF);
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LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname));
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return 0;
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}
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int
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lptpushbytes(sc)
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struct lpt_softc *sc;
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{
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bus_space_tag_t iot = sc->sc_iot;
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bus_space_handle_t ioh = sc->sc_ioh;
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int error;
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if (sc->sc_flags & LPT_NOINTR) {
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int spin, tic;
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u_char control = sc->sc_control;
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while (sc->sc_count > 0) {
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spin = 0;
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while (NOT_READY()) {
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if (++spin < sc->sc_spinmax)
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continue;
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tic = 0;
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/* adapt busy-wait algorithm */
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sc->sc_spinmax++;
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while (NOT_READY_ERR()) {
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/* exponential backoff */
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tic = tic + tic + 1;
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if (tic > TIMEOUT)
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tic = TIMEOUT;
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error = tsleep((caddr_t)sc,
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LPTPRI | PCATCH, "lptpsh", tic);
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if (error != EWOULDBLOCK)
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return error;
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}
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break;
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}
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bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
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DELAY(1);
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bus_space_write_1(iot, ioh, lpt_control,
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control | LPC_STROBE);
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DELAY(1);
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sc->sc_count--;
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bus_space_write_1(iot, ioh, lpt_control, control);
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DELAY(1);
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/* adapt busy-wait algorithm */
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if (spin*2 + 16 < sc->sc_spinmax)
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sc->sc_spinmax--;
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}
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} else {
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int s;
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while (sc->sc_count > 0) {
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/* if the printer is ready for a char, give it one */
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if ((sc->sc_state & LPT_OBUSY) == 0) {
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LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname,
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(u_long)sc->sc_count));
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s = spllpt();
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(void) lptintr(sc);
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splx(s);
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}
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error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
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"lptwrite2", 0);
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if (error)
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return error;
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}
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}
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return 0;
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}
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/*
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* Copy a line from user space to a local buffer, then call putc to get the
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* chars moved to the output queue.
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*/
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int
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lptwrite(dev, uio, flags)
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dev_t dev;
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struct uio *uio;
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int flags;
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{
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struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev));
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size_t n;
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int error = 0;
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while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) {
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uiomove(sc->sc_cp = sc->sc_inbuf, n, uio);
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sc->sc_count = n;
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error = lptpushbytes(sc);
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if (error) {
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/*
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* Return accurate residual if interrupted or timed
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* out.
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*/
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uio->uio_resid += sc->sc_count;
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sc->sc_count = 0;
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return error;
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}
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}
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return 0;
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}
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/*
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* Handle printer interrupts which occur when the printer is ready to accept
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* another char.
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*/
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int
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lptintr(arg)
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void *arg;
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{
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struct lpt_softc *sc = arg;
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bus_space_tag_t iot = sc->sc_iot;
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bus_space_handle_t ioh = sc->sc_ioh;
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#if 0
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if ((sc->sc_state & LPT_OPEN) == 0)
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return 0;
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#endif
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/* is printer online and ready for output */
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if (NOT_READY() && NOT_READY_ERR())
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return 0;
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if (sc->sc_count) {
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u_char control = sc->sc_control;
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/* send char */
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bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
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DELAY(1);
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bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE);
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DELAY(1);
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sc->sc_count--;
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bus_space_write_1(iot, ioh, lpt_control, control);
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DELAY(1);
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sc->sc_state |= LPT_OBUSY;
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} else
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sc->sc_state &= ~LPT_OBUSY;
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if (sc->sc_count == 0) {
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/* none, wake up the top half to get more */
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wakeup((caddr_t)sc);
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}
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return 1;
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}
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int
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lptioctl(dev, cmd, data, flag, p)
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dev_t dev;
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u_long cmd;
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caddr_t data;
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int flag;
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struct proc *p;
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{
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int error = 0;
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switch (cmd) {
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default:
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error = ENODEV;
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}
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return error;
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}
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