/* $NetBSD: lpt.c,v 1.38 2018/09/03 16:29:24 riastradh Exp $ */ /* * Copyright (c) 1996 Leo Weppelman * 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 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 originally written for AT parallel printer port. Now * drives the printer port on the YM2149. * * 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. */ #include __KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.38 2018/09/03 16:29:24 riastradh Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ioconf.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 if (0) aprint_error_dev #else #define lprintf if (lptdebug) aprint_error_dev int lptdebug = 1; #endif struct lpt_softc { device_t sc_dev; struct callout sc_wakeup_ch; size_t sc_count; struct buf *sc_inbuf; u_char *sc_cp; int sc_spinmax; u_char sc_state; #define LPT_OPEN 0x01 /* device is open */ #define LPT_OBUSY 0x02 /* printer is busy doing output */ #define LPT_INIT 0x04 /* waiting to initialize for open */ u_char sc_flags; #define LPT_AUTOLF 0x20 /* automatic LF on CR XXX: LWP - not yet... */ #define LPT_NOINTR 0x40 /* do not use interrupt */ void *sc_sicookie; }; #define LPTUNIT(s) (minor(s) & 0x1f) #define LPTFLAGS(s) (minor(s) & 0xe0) #define NOT_READY() (MFP->mf_gpip & IO_PBSY) /* {b,c}devsw[] function prototypes */ dev_type_open(lpopen); dev_type_close(lpclose); dev_type_write(lpwrite); dev_type_ioctl(lpioctl); static void lptwakeup (void *arg); static int pushbytes (struct lpt_softc *); static void lptpseudointr (void *); int lptintr (struct lpt_softc *); int lpthwintr (void *); /* * Autoconfig stuff */ static void lpattach (device_t, device_t, void *); static int lpmatch (device_t, cfdata_t , void *); CFATTACH_DECL_NEW(lp, sizeof(struct lpt_softc), lpmatch, lpattach, NULL, NULL); const struct cdevsw lp_cdevsw = { .d_open = lpopen, .d_close = lpclose, .d_read = noread, .d_write = lpwrite, .d_ioctl = lpioctl, .d_stop = nostop, .d_tty = notty, .d_poll = nopoll, .d_mmap = nommap, .d_kqfilter = nokqfilter, .d_discard = nodiscard, .d_flag = 0 }; /*ARGSUSED*/ static int lpmatch(device_t parent, cfdata_t cf, void *aux) { static int lpt_matched = 0; /* Match at most 1 lpt unit */ if (strcmp((char *)aux, "lpt") || lpt_matched) return 0; lpt_matched = 1; return (1); } /*ARGSUSED*/ static void lpattach(device_t parent, device_t self, void *aux) { struct lpt_softc *sc = device_private(self); sc->sc_dev = self; sc->sc_state = 0; aprint_normal("\n"); if (intr_establish(0, USER_VEC, 0, (hw_ifun_t)lpthwintr, sc) == NULL) aprint_error_dev(self, "Can't establish interrupt\n"); ym2149_strobe(1); sc->sc_sicookie = softint_establish(SOFTINT_SERIAL, lptpseudointr, sc); callout_init(&sc->sc_wakeup_ch, 0); } /* * Reset the printer, then wait until it's selected and not busy. */ int lpopen(dev_t dev, int flag, int mode, struct lwp *l) { u_char flags = LPTFLAGS(dev); struct lpt_softc *sc; int error; int spin; int sps; sc = device_lookup_private(&lp_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); /* wait till ready (printer running diagnostics) */ for (spin = 0; NOT_READY(); 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((void *)sc, LPTPRI | PCATCH, "lptopen", STEP)) != 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) { lptwakeup(sc); sps = splhigh(); MFP->mf_imrb |= IB_PBSY; MFP->mf_ierb |= IB_PBSY; splx(sps); } lprintf(sc->sc_dev, "opened\n"); return 0; } void lptwakeup(void *arg) { struct lpt_softc *sc = arg; lptpseudointr(sc); callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); } /* * Close the device, and free the local line buffer. */ int lpclose(dev_t dev, int flag, int mode, struct lwp *l) { struct lpt_softc *sc = device_lookup_private(&lp_cd, LPTUNIT(dev)); int sps; if (sc->sc_count) (void) pushbytes(sc); if ((sc->sc_flags & LPT_NOINTR) == 0) { callout_stop(&sc->sc_wakeup_ch); sps = splhigh(); MFP->mf_ierb &= ~IB_PBSY; MFP->mf_imrb &= ~IB_PBSY; splx(sps); } sc->sc_state = 0; brelse(sc->sc_inbuf, 0); lprintf(sc->sc_dev, "closed\n"); return 0; } int pushbytes(struct lpt_softc *sc) { int error; if (sc->sc_flags & LPT_NOINTR) { int spin, tic; while (sc->sc_count > 0) { spin = 0; while (NOT_READY()) { if (++spin < sc->sc_spinmax) continue; tic = 0; /* adapt busy-wait algorithm */ sc->sc_spinmax++; while (NOT_READY()) { /* 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; } ym2149_write_ioport(YM_IOB, *sc->sc_cp++); ym2149_strobe(0); sc->sc_count--; ym2149_strobe(1); /* 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); (void) lptpseudointr(sc); } if ((error = tsleep((void *)sc, LPTPRI | PCATCH, "lptwrite2", 0)) != 0) 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 lpwrite(dev_t dev, struct uio *uio, int flags) { struct lpt_softc *sc = device_lookup_private(&lp_cd,LPTUNIT(dev)); size_t n; int 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 lptintr(struct lpt_softc *sc) { /* is printer online and ready for output */ if (NOT_READY()) return 0; if (sc->sc_count) { /* send char */ ym2149_write_ioport(YM_IOB, *sc->sc_cp++); ym2149_strobe(0); sc->sc_count--; ym2149_strobe(1); 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; } static void lptpseudointr(void *arg) { struct lpt_softc *sc; int s; sc = arg; s = spltty(); lptintr(sc); splx(s); } int lpthwintr(void *arg) { struct lpt_softc *sc; sc = arg; softint_schedule(sc->sc_sicookie); return 1; } int lpioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) { int error = 0; switch (cmd) { default: error = ENODEV; } return error; }