/* $NetBSD: lpt.c,v 1.5 1999/02/14 17:54:28 scw Exp $ */ /*- * Copyright (c) 1999 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * 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. */ /* * Device Driver for an MVME1xx board's parallel printer port * This driver attaches above the board-specific back-end. */ #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(a) #else #define LPRINTF if (lptdebug) printf a int lptdebug = 1; #endif /* {b,c}devsw[] function prototypes */ dev_type_open(lptopen); dev_type_close(lptclose); dev_type_write(lptwrite); dev_type_ioctl(lptioctl); #define LPTUNIT(s) (minor(s) & 0x0f) #define LPTFLAGS(s) (minor(s) & 0xf0) static void lpt_wakeup __P((void *arg)); static int pushbytes __P((struct lpt_softc *)); extern struct cfdriver lpt_cd; void lpt_attach_subr(sc) struct lpt_softc *sc; { sc->sc_state = 0; } /* * Reset the printer, then wait until it's selected and not busy. */ int lptopen(dev, flag, mode, p) dev_t dev; int flag; int mode; struct proc *p; { int unit = LPTUNIT(dev); u_char flags = LPTFLAGS(dev); struct lpt_softc *sc; int error; int spin; 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)); 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((caddr_t)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(("%s: opened\n", sc->sc_dev.dv_xname)); return 0; } void lpt_wakeup(arg) void *arg; { struct lpt_softc *sc = arg; int s; s = spltty(); lpt_intr(sc); splx(s); timeout(lpt_wakeup, 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]; if (sc->sc_count) (void) pushbytes(sc); if ( (sc->sc_flags & LPT_NOINTR) == 0 ) untimeout(lpt_wakeup, sc); (sc->sc_funcs->lf_close)(sc); 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 ( (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((caddr_t)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 { 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) lpt_intr(sc); splx(s); } error = tsleep((caddr_t)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, 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 lpt_intr(sc) 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((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; }