/* $NetBSD: lpt.c,v 1.3 1998/01/12 19:51:07 thorpej Exp $ */ /* * Copyright (c) 1996 Steve Woodford * 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 for the MVME147's parallel printer port * Based mostly on the AT parallel port driver by Charles Hannum and * William F. Jolitz. * Some additional code is based on the NetBSD/atari parallel port * driver, by Leo Weppelman. */ #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(a) #else #define LPRINTF if (lptdebug) printf a int lptdebug = 1; #endif struct lpt_softc { struct device sc_dev; union lpt_regs *sc_regs; size_t sc_count; struct buf *sc_inbuf; u_char *sc_cp; int sc_spinmax; int sc_ipl; 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_FAST_STROBE 0x10 /* Select 1.6uS strobe pulse */ #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_prir; u_char sc_laststatus; }; /* {b,c}devsw[] function prototypes */ dev_type_open(lptopen); dev_type_close(lptclose); dev_type_write(lptwrite); dev_type_ioctl(lptioctl); int lptintr __P((void *)); /* * Autoconfig stuff */ static int lpt_pcc_match __P((struct device *, struct cfdata *, void *)); static void lpt_pcc_attach __P((struct device *, struct device *, void *)); struct cfattach lpt_pcc_ca = { sizeof(struct lpt_softc), lpt_pcc_match, lpt_pcc_attach }; extern struct cfdriver lpt_cd; #define LPTUNIT(s) (minor(s) & 0x0f) #define LPTFLAGS(s) (minor(s) & 0xf0) #define LPS_INVERT (LPS_SELECT) #define LPS_MASK (LPS_SELECT|LPS_FAULT|LPS_BUSY|LPS_PAPER_EMPTY) #define NOT_READY() ((sc->sc_regs->pr_status ^ LPS_INVERT) & LPS_MASK) #define NOT_READY_ERR() not_ready(sc->sc_regs->pr_status, sc) static int not_ready __P((u_char, struct lpt_softc *)); static void lptwakeup __P((void *arg)); static int pushbytes __P((struct lpt_softc *)); /*ARGSUSED*/ static int lpt_pcc_match(pdp, cf, auxp) struct device *pdp; struct cfdata *cf; void *auxp; { struct pcc_attach_args *pa = auxp; if (strcmp(pa->pa_name, lpt_cd.cd_name)) return (0); pa->pa_ipl = cf->pcccf_ipl; return (1); } /*ARGSUSED*/ static void lpt_pcc_attach(pdp, dp, auxp) struct device *pdp, *dp; void *auxp; { struct lpt_softc *sc = (void *)dp; struct pcc_attach_args *pa = auxp; /* * Get pointer to regs */ sc->sc_regs = (union lpt_regs *) PCC_VADDR(pa->pa_offset); sc->sc_ipl = pa->pa_ipl & PCC_IMASK; sc->sc_state = 0; sc->sc_laststatus = 0; /* * Hook into the printer interrupt */ pccintr_establish(PCCV_PRINTER, lptintr, sc->sc_ipl, sc); /* * Disable interrupts until device is opened */ sys_pcc->pr_int = 0; 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; 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 */ sys_pcc->pr_cr = LPC_INPUT_PRIME; delay(100); } /* select fast or slow strobe depending on minor device number */ if ( flags & LPT_FAST_STROBE ) sys_pcc->pr_cr = LPC_FAST_STROBE; else sys_pcc->pr_cr = 0; /* wait till ready (printer running diagnostics) */ for (spin = 0; NOT_READY_ERR(); 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; sc->sc_prir = 0; sys_pcc->pr_int = LPI_ACKINT | LPI_FAULTINT; if ((sc->sc_flags & LPT_NOINTR) == 0) { int sps; lptwakeup(sc); sc->sc_prir = sc->sc_ipl | LPI_ENABLE; sps = splhigh(); sys_pcc->pr_int = sc->sc_prir; splx(sps); } LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); return 0; } int not_ready(status, sc) u_char status; struct lpt_softc *sc; { u_char new; status = (status ^ LPS_INVERT) & LPS_MASK; new = status & ~sc->sc_laststatus; sc->sc_laststatus = status; if (new & LPS_SELECT) log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname); else if (new & LPS_PAPER_EMPTY) log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname); else if (new & LPS_FAULT) log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname); sys_pcc->pr_int = sc->sc_prir | LPI_FAULTINT; return status; } void lptwakeup(arg) void *arg; { struct lpt_softc *sc = arg; int s; s = spltty(); lptintr(sc); 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]; if (sc->sc_count) (void) pushbytes(sc); if ((sc->sc_flags & LPT_NOINTR) == 0) { int sps; untimeout(lptwakeup, sc); sc->sc_prir = 0; sps = splhigh(); sys_pcc->pr_int = LPI_ACKINT | LPI_FAULTINT; 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_ERR()) { /* 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_regs->pr_data = *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) lptintr(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 lptintr(arg) void *arg; { struct lpt_softc *sc = arg; #if 0 if ((sc->sc_state & LPT_OPEN) == 0) return 0; #endif /* is printer online and ready for output */ if (NOT_READY() && NOT_READY_ERR()) return 0; if (sc->sc_count) { /* send char */ sc->sc_regs->pr_data = *sc->sc_cp++; sc->sc_count--; sc->sc_state |= LPT_OBUSY; } else sc->sc_state &= ~LPT_OBUSY; if ( sys_pcc->pr_int & LPI_ACKINT ) sys_pcc->pr_int = sc->sc_prir | LPI_ACKINT; 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; }