initial import of NetBSD tree

1 files changed, 531 insertions, 0 deletions

diff --git a/sys/dev/isa/lpt.c b/sys/dev/isa/lpt.c
new file mode 100644
index 00000000000..aee3a5be153
--- /dev/null
+++ b/sys/dev/isa/lpt.c
@@ -0,0 +1,531 @@
+/*	$NetBSD: lpt.c,v 1.30 1995/04/17 12:09:17 cgd Exp $	*/
+
+/*
+ * 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 AT parallel printer port
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/user.h>
+#include <sys/buf.h>
+#include <sys/kernel.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+#include <sys/device.h>
+#include <sys/syslog.h>
+
+#include <machine/cpu.h>
+#include <machine/pio.h>
+
+#include <dev/isa/isavar.h>
+#include <dev/isa/lptreg.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
+#else
+#define lprintf		if (lptdebug) printf
+int lptdebug = 1;
+#endif
+
+struct lpt_softc {
+	struct device sc_dev;
+	void *sc_ih;
+
+	size_t sc_count;
+	struct buf *sc_inbuf;
+	u_char *sc_cp;
+	int sc_spinmax;
+	int sc_iobase;
+	int 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 __P((struct device *, void *, void *));
+void lptattach __P((struct device *, struct device *, void *));
+int lptintr __P((void *));
+
+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)
+#define	NOT_READY()	((inb(iobase + lpt_status) ^ LPS_INVERT) & LPS_MASK)
+#define	NOT_READY_ERR()	not_ready(inb(iobase + lpt_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 *));
+
+/*
+ * Internal routine to lptprobe to do port tests of one byte value.
+ */
+int
+lpt_port_test(port, data, mask)
+	int 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, match, aux)
+	struct device *parent;
+	void *match, *aux;
+{
+	struct isa_attach_args *ia = aux;
+	int iobase = ia->ia_iobase;
+	int 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;
+
+	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;
+	}
+
+	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;
+	int iobase = ia->ia_iobase;
+
+	if (ia->ia_irq != IRQUNK)
+		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 != IRQUNK)
+		sc->sc_ih = isa_intr_establish(ia->ia_irq, ISA_IST_EDGE,
+		    ISA_IPL_NONE, lptintr, sc);
+}
+
+/*
+ * 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;
+	int 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 == IRQUNK && (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_ERR(); 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;
+
+	if ((sc->sc_flags & LPT_NOINTR) == 0)
+		lptwakeup(sc);
+
+	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_NOPAPER)
+		log(LOG_NOTICE, "%s: out of paper\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;
+}
+
+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.
+ */
+lptclose(dev, flag)
+	dev_t dev;
+	int flag;
+{
+	int unit = LPTUNIT(dev);
+	struct lpt_softc *sc = lptcd.cd_devs[unit];
+	int iobase = sc->sc_iobase;
+
+	if (sc->sc_count)
+		(void) pushbytes(sc);
+
+	if ((sc->sc_flags & LPT_NOINTR) == 0)
+		untimeout(lptwakeup, 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;
+{
+	int 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()) {
+				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;
+			}
+
+			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 + 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);
+			}
+			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(arg)
+	void *arg;
+{
+	struct lpt_softc *sc = arg;
+	int 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() && NOT_READY_ERR())
+		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;
+	u_long cmd;
+	caddr_t data;
+	int flag;
+{
+	int error = 0;
+
+	switch (cmd) {
+	default:
+		error = ENODEV;
+	}
+
+	return error;
+}