/* * 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. * * $Id: lpt.c,v 1.22 1994/06/16 01:08:21 mycroft Exp $ */ /* * Device Driver for AT parallel printer port */ #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 #else #define lprintf if (lptdebug) printf int lptdebug = 1; #endif struct lpt_softc { struct device sc_dev; struct intrhand sc_ih; size_t sc_count; struct buf *sc_inbuf; u_char *sc_cp; int sc_spinmax; u_short sc_iobase; u_short sc_irq; 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 */ #define LPT_NOPRIME 0x40 /* don't prime on open */ #define LPT_NOINTR 0x80 /* do not use interrupt */ u_char sc_control; u_char sc_laststatus; }; int lptprobe(); void lptattach(); int lptintr __P((struct lpt_softc *)); struct cfdriver lptcd = { NULL, "lpt", lptprobe, lptattach, DV_TTY, sizeof(struct lpt_softc) }; #define LPTUNIT(s) (minor(s) & 0x1f) #define LPTFLAGS(s) (minor(s) & 0xe0) #define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK) #define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER) #ifndef DIAGNOSTIC #define NOT_READY() ((inb(iobase + lpt_status) ^ LPS_INVERT) & LPS_MASK) #else #define NOT_READY() notready(inb(iobase + lpt_status), sc) static int notready __P((u_char, struct lpt_softc *)); #endif static void lptout __P((void *arg)); static int pushbytes __P((struct lpt_softc *)); /* * Internal routine to lptprobe to do port tests of one byte value. */ int lpt_port_test(port, data, mask) u_short port; u_char data, mask; { int timeout; u_char temp; data &= mask; outb(port, data); timeout = 1000; do { delay(10); temp = inb(port) & mask; } while (temp != data && --timeout); lprintf("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", port, data, temp, timeout); return (temp == data); } /* * Logic: * 1) You should be able to write to and read back the same value * to the data port. Do an alternating zeros, alternating ones, * walking zero, and walking one test to check for stuck bits. * * 2) You should be able to write to and read back the same value * to the control port lower 5 bits, the upper 3 bits are reserved * per the IBM PC technical reference manauls and different boards * do different things with them. Do an alternating zeros, alternating * ones, walking zero, and walking one test to check for stuck bits. * * Some printers drag the strobe line down when the are powered off * so this bit has been masked out of the control port test. * * XXX Some printers may not like a fast pulse on init or strobe, I * don't know at this point, if that becomes a problem these bits * should be turned off in the mask byte for the control port test. * * 3) Set the data and control ports to a value of 0 */ int lptprobe(parent, self, aux) struct device *parent, *self; void *aux; { struct isa_attach_args *ia = aux; u_short iobase = ia->ia_iobase; u_short port; u_char mask, data; int i; #ifdef DEBUG #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ return 0;} while (0) #else #define ABORT return 0 #endif port = iobase + lpt_data; mask = 0xff; for (;;) { data = 0x55; /* Alternating zeros */ if (!lpt_port_test(port, data, mask)) ABORT; data = 0xaa; /* Alternating ones */ if (!lpt_port_test(port, data, mask)) ABORT; for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ data = ~(1 << i); if (!lpt_port_test(port, data, mask)) ABORT; } for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ data = (1 << i); if (!lpt_port_test(port, data, mask)) ABORT; } if (port == iobase + lpt_data) { port = iobase + lpt_control; #if 1 /* XXX */ mask = 0x04; #else mask = 0x1e; #endif } else break; } outb(iobase + lpt_data, 0); outb(iobase + lpt_control, 0); ia->ia_iosize = LPT_NPORTS; ia->ia_msize = 0; return 1; } void lptattach(parent, self, aux) struct device *parent, *self; void *aux; { struct lpt_softc *sc = (void *)self; struct isa_attach_args *ia = aux; u_short iobase = ia->ia_iobase; if (ia->ia_irq) printf("\n"); else printf(": polled\n"); sc->sc_iobase = iobase; sc->sc_irq = ia->ia_irq; sc->sc_state = 0; outb(iobase + lpt_control, LPC_NINIT); if (ia->ia_irq) { sc->sc_ih.ih_fun = lptintr; sc->sc_ih.ih_arg = sc; sc->sc_ih.ih_level = IPL_NONE; intr_establish(ia->ia_irq, &sc->sc_ih); } } /* * Reset the printer, then wait until it's selected and not busy. */ int lptopen(dev, flag) dev_t dev; int flag; { int unit = LPTUNIT(dev); u_char flags = LPTFLAGS(dev); struct lpt_softc *sc; u_short iobase; u_char control; int error; int spin; if (unit >= lptcd.cd_ndevs) return ENXIO; sc = lptcd.cd_devs[unit]; if (!sc) return ENXIO; if (sc->sc_irq == 0 && (flags & LPT_NOINTR) == 0) 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); iobase = sc->sc_iobase; if ((flags & LPT_NOPRIME) == 0) { /* assert INIT for 100 usec to start up printer */ outb(iobase + lpt_control, LPC_SELECT); delay(100); } control = LPC_SELECT | LPC_NINIT; outb(iobase + lpt_control, control); /* 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; } } if ((flags & LPT_NOINTR) == 0) control |= LPC_IENABLE; if (flags & LPT_AUTOLF) control |= LPC_AUTOLF; sc->sc_control = control; outb(iobase + lpt_control, control); sc->sc_inbuf = geteblk(LPT_BSIZE); sc->sc_count = 0; sc->sc_state = LPT_OPEN; lptout(sc); lprintf("%s: opened\n", sc->sc_dev.dv_xname); return 0; } #ifdef DIAGNOSTIC int notready(status, sc) u_char status; struct lpt_softc *sc; { u_char new; status ^= LPS_INVERT; new = status & ~sc->sc_laststatus; sc->sc_laststatus = status; if (new & LPS_NOPAPER) log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); else if (new & LPS_SELECT) log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); else if (new & LPS_NERR) log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); return status & LPS_MASK; } #endif void lptout(arg) void *arg; { struct lpt_softc *sc; int s; sc = (struct lpt_softc *)arg; if (sc->sc_flags & LPT_NOINTR) return; s = spltty(); lptintr(sc); splx(s); timeout(lptout, sc, STEP); } /* * Close the device, and free the local line buffer. */ lptclose(dev, flag) dev_t dev; int flag; { int unit = LPTUNIT(dev); struct lpt_softc *sc = lptcd.cd_devs[unit]; u_short iobase = sc->sc_iobase; if (sc->sc_count) (void) pushbytes(sc); outb(iobase + lpt_control, LPC_NINIT); sc->sc_state = 0; outb(iobase + lpt_control, LPC_NINIT); brelse(sc->sc_inbuf); lprintf("%s: closed\n", sc->sc_dev.dv_xname); return 0; } int pushbytes(sc) struct lpt_softc *sc; { u_short iobase = sc->sc_iobase; int error; if (sc->sc_flags & LPT_NOINTR) { int spin, tic; u_char control = sc->sc_control; while (sc->sc_count > 0) { spin = 0; while (NOT_READY() && spin++ < sc->sc_spinmax); if (spin >= sc->sc_spinmax) { 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; } } outb(iobase + lpt_data, *sc->sc_cp++); outb(iobase + lpt_control, control | LPC_STROBE); sc->sc_count--; outb(iobase + lpt_control, control); /* adapt busy-wait algorithm */ if (spin*2 < 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(sc); splx(s); } if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptwrite2", 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. */ lptwrite(dev, uio) dev_t dev; struct uio *uio; { struct lpt_softc *sc = lptcd.cd_devs[LPTUNIT(dev)]; size_t n; int error = 0; while (n = min(LPT_BSIZE, uio->uio_resid)) { 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(sc) struct lpt_softc *sc; { u_short iobase = sc->sc_iobase; #if 0 if ((sc->sc_state & LPT_OPEN) == 0) return 0; #endif /* is printer online and ready for output */ if (NOT_READY()) return 0; if (sc->sc_count) { u_char control = sc->sc_control; /* send char */ outb(iobase + lpt_data, *sc->sc_cp++); outb(iobase + lpt_control, control | LPC_STROBE); sc->sc_count--; outb(iobase + lpt_control, control); 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) dev_t dev; int cmd; caddr_t data; int flag; { int error = 0; switch (cmd) { default: error = ENODEV; } return error; }