/* $NetBSD: lpt_mvme.c,v 1.19 2018/09/03 16:29:32 riastradh Exp $ */ /*- * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Steve C. Woodford. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * Copyright (c) 1993, 1994 Charles M. 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 an MVME68K/MVME88K board's parallel printer port * This driver attaches above the board-specific back-end. */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: lpt_mvme.c,v 1.19 2018/09/03 16:29:32 riastradh Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/buf.h> #include <sys/kernel.h> #include <sys/ioctl.h> #include <sys/uio.h> #include <sys/device.h> #include <sys/conf.h> #include <sys/syslog.h> #include <sys/cpu.h> #include <sys/bus.h> #include <dev/mvme/lptvar.h> #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(DEBUG) || !defined(notdef) #define LPRINTF(a) #else #define LPRINTF if (lptdebug) aprint_verbose_dev a int lptdebug = 1; #endif #define LPTUNIT(s) (minor(s) & 0x0f) #define LPTFLAGS(s) (minor(s) & 0xf0) static void lpt_wakeup(void *arg); static int pushbytes(struct lpt_softc *); extern struct cfdriver lpt_cd; dev_type_open(lptopen); dev_type_close(lptclose); dev_type_write(lptwrite); dev_type_ioctl(lptioctl); const struct cdevsw lpt_cdevsw = { .d_open = lptopen, .d_close = lptclose, .d_read = noread, .d_write = lptwrite, .d_ioctl = lptioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = 0 }; void lpt_attach_subr(struct lpt_softc *sc) { sc->sc_state = 0; callout_init(&sc->sc_wakeup_ch, 0); } /* * Reset the printer, then wait until it's selected and not busy. */ int lptopen(dev_t dev, int flag, int mode, struct lwp *l) { u_char flags; struct lpt_softc *sc; int error; int spin; flags = LPTFLAGS(dev); sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); if (!sc) return (ENXIO); #ifdef DIAGNOSTIC if (sc->sc_state) aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", sc->sc_state); #endif if (sc->sc_state) return (EBUSY); sc->sc_state = LPT_INIT; sc->sc_flags = flags; LPRINTF((sc->sc_dev, "open: flags=0x%x\n", flags)); if ((flags & LPT_NOPRIME) == 0) { /* assert Input Prime for 100 usec to start up printer */ (sc->sc_funcs->lf_iprime) (sc); } /* select fast or slow strobe depending on minor device number */ if (flags & LPT_FAST_STROBE) (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_FAST); else (sc->sc_funcs->lf_speed) (sc, LPT_STROBE_SLOW); /* wait till ready (printer running diagnostics) */ for (spin = 0; (sc->sc_funcs->lf_notrdy) (sc, 1); spin += STEP) { if (spin >= TIMEOUT) { sc->sc_state = 0; return (EBUSY); } /* wait 1/4 second, give up if we get a signal */ error = tsleep((void *) sc, LPTPRI | PCATCH, "lptopen", STEP); if (error != EWOULDBLOCK) { sc->sc_state = 0; return (error); } } sc->sc_inbuf = geteblk(LPT_BSIZE); sc->sc_count = 0; sc->sc_state = LPT_OPEN; if ((sc->sc_flags & LPT_NOINTR) == 0) lpt_wakeup(sc); (sc->sc_funcs->lf_open) (sc, sc->sc_flags & LPT_NOINTR); LPRINTF((sc->sc_dev, "opened\n")); return (0); } void lpt_wakeup(void *arg) { struct lpt_softc *sc; int s; sc = arg; s = spltty(); lpt_intr(sc); splx(s); callout_reset(&sc->sc_wakeup_ch, STEP, lpt_wakeup, sc); } /* * Close the device, and free the local line buffer. */ int lptclose(dev_t dev, int flag, int mode, struct lwp *l) { struct lpt_softc *sc; sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); if (sc->sc_count) (void) pushbytes(sc); if ((sc->sc_flags & LPT_NOINTR) == 0) callout_stop(&sc->sc_wakeup_ch); (sc->sc_funcs->lf_close) (sc); sc->sc_state = 0; brelse(sc->sc_inbuf, 0); LPRINTF((sc->sc_dev, "%s: closed\n")); return (0); } int pushbytes(struct lpt_softc *sc) { int s, error, spin, tic; if (sc->sc_flags & LPT_NOINTR) { while (sc->sc_count > 0) { spin = 0; while ((sc->sc_funcs->lf_notrdy) (sc, 0)) { if (++spin < sc->sc_spinmax) continue; tic = 0; /* adapt busy-wait algorithm */ sc->sc_spinmax++; while ((sc->sc_funcs->lf_notrdy) (sc, 1)) { /* exponential backoff */ tic = tic + tic + 1; if (tic > TIMEOUT) tic = TIMEOUT; error = tsleep((void *) sc, LPTPRI | PCATCH, "lptpsh", tic); if (error != EWOULDBLOCK) return (error); } break; } (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); sc->sc_count--; /* adapt busy-wait algorithm */ if (spin * 2 + 16 < sc->sc_spinmax) sc->sc_spinmax--; } } else { while (sc->sc_count > 0) { /* if the printer is ready for a char, give it one */ if ((sc->sc_state & LPT_OBUSY) == 0) { LPRINTF((sc->sc_dev, "write %d\n", sc->sc_count)); s = spltty(); (void) lpt_intr(sc); splx(s); } error = tsleep((void *) sc, LPTPRI | PCATCH, "lptwrite2", 0); if (error) return (error); } } return (0); } /* * Copy a line from user space to a local buffer, then call putc to get the * chars moved to the output queue. */ int lptwrite(dev_t dev, struct uio *uio, int flags) { struct lpt_softc *sc; size_t n; int error; sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); error = 0; while ((n = uimin(LPT_BSIZE, uio->uio_resid)) != 0) { uiomove(sc->sc_cp = sc->sc_inbuf->b_data, 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. */ int lpt_intr(struct lpt_softc *sc) { if (sc->sc_count) { /* send char */ (sc->sc_funcs->lf_wrdata) (sc, *sc->sc_cp++); sc->sc_count--; sc->sc_state |= LPT_OBUSY; } else sc->sc_state &= ~LPT_OBUSY; if (sc->sc_count == 0) { /* none, wake up the top half to get more */ wakeup((void *) sc); } return (1); } /* ARGSUSED */ int lptioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { return (ENODEV); }
