/* $NetBSD: lpt.c,v 1.6 1996/10/13 04:11:05 christos Exp $ */ /* * Copyright (c) 1996 Leo Weppelman * 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 originally written for AT parallel printer port. Now * drives the printer port on the YM2149. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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) printf #else #define lprintf if (lptdebug) printf int lptdebug = 1; #endif struct lpt_softc { struct device sc_dev; 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 */ }; #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(lptopen); dev_type_close(lptclose); dev_type_write(lptwrite); dev_type_ioctl(lptioctl); static void lptwakeup __P((void *arg)); static int pushbytes __P((struct lpt_softc *)); int lptintr __P((void)); /* * Autoconfig stuff */ static void lptattach __P((struct device *, struct device *, void *)); static int lptmatch __P((struct device *, void *, void *)); struct cfattach lpt_ca = { sizeof(struct lpt_softc), lptmatch, lptattach }; struct cfdriver lpt_cd = { NULL, "lpt", DV_DULL, NULL, 0 }; /*ARGSUSED*/ static int lptmatch(pdp, match, auxp) struct device *pdp; void *match, *auxp; { struct cfdata *cfp = match; if (!strcmp((char *)auxp, "lpt") && cfp->cf_unit == 0) return (1); return (0); } /*ARGSUSED*/ static void lptattach(pdp, dp, auxp) struct device *pdp, *dp; void *auxp; { struct lpt_softc *sc = (void *)dp; sc->sc_state = 0; ym2149_strobe(1); printf("\n"); } /* * Reset the printer, then wait until it's selected and not busy. */ int lptopen(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { int unit = LPTUNIT(dev); u_char flags = LPTFLAGS(dev); struct lpt_softc *sc; int error; int spin; int sps; if (unit >= lpt_cd.cd_ndevs) return ENXIO; sc = lpt_cd.cd_devs[unit]; if (!sc) return ENXIO; #ifdef DIAGNOSTIC if (sc->sc_state) printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, sc->sc_state); #endif if (sc->sc_state) return EBUSY; sc->sc_state = LPT_INIT; sc->sc_flags = flags; lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 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((caddr_t)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("%s: opened\n", sc->sc_dev.dv_xname); return 0; } void lptwakeup(arg) void *arg; { struct lpt_softc *sc = arg; int s; s = spltty(); lptintr(); splx(s); timeout(lptwakeup, sc, STEP); } /* * Close the device, and free the local line buffer. */ int lptclose(dev, flag, mode, p) dev_t dev; int flag; int mode; struct proc *p; { int unit = LPTUNIT(dev); struct lpt_softc *sc = lpt_cd.cd_devs[unit]; int sps; if (sc->sc_count) (void) pushbytes(sc); if ((sc->sc_flags & LPT_NOINTR) == 0) { untimeout(lptwakeup, sc); sps = splhigh(); MFP->mf_ierb &= ~IB_PBSY; MFP->mf_imrb &= ~IB_PBSY; splx(sps); } sc->sc_state = 0; brelse(sc->sc_inbuf); lprintf("%s: closed\n", sc->sc_dev.dv_xname); return 0; } int pushbytes(sc) 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((caddr_t)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 { int s; while (sc->sc_count > 0) { /* if the printer is ready for a char, give it one */ if ((sc->sc_state & LPT_OBUSY) == 0) { lprintf("%s: write %d\n", sc->sc_dev.dv_xname, sc->sc_count); s = spltty(); (void) lptintr(); splx(s); } if ((error = tsleep((caddr_t)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 lptwrite(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)]; size_t n; int error = 0; while ((n = min(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; sc = lpt_cd.cd_devs[0]; /* XXX: LWP - we have only one on the Atari */ /* 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((caddr_t)sc); } return 1; } int lptioctl(dev, cmd, data, flag, p) dev_t dev; u_long cmd; caddr_t data; int flag; struct proc *p; { int error = 0; switch (cmd) { default: error = ENODEV; } return error; }