545 lines
13 KiB
C
545 lines
13 KiB
C
/* $NetBSD: lpt.c,v 1.25 1994/11/18 22:03:28 mycroft Exp $ */
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/*
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* Copyright (c) 1993, 1994 Charles Hannum.
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* Copyright (c) 1990 William F. Jolitz, TeleMuse
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This software is a component of "386BSD" developed by
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* William F. Jolitz, TeleMuse.
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* 4. Neither the name of the developer nor the name "386BSD"
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
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* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
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* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
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* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
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* NOT MAKE USE OF THIS WORK.
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*
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* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
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* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
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* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
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* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
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* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
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* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
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* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
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* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* Device Driver for AT parallel printer port
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/user.h>
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#include <sys/buf.h>
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#include <sys/kernel.h>
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#include <sys/ioctl.h>
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#include <sys/uio.h>
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#include <sys/device.h>
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#include <sys/syslog.h>
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#include <machine/cpu.h>
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#include <machine/pio.h>
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#include <i386/isa/isavar.h>
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#include <i386/isa/lptreg.h>
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#define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */
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#define STEP hz/4
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#define LPTPRI (PZERO+8)
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#define LPT_BSIZE 1024
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#if !defined(DEBUG) || !defined(notdef)
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#define lprintf
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#else
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#define lprintf if (lptdebug) printf
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int lptdebug = 1;
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#endif
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struct lpt_softc {
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struct device sc_dev;
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struct intrhand sc_ih;
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size_t sc_count;
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struct buf *sc_inbuf;
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u_char *sc_cp;
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int sc_spinmax;
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int sc_iobase;
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int sc_irq;
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u_char sc_state;
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#define LPT_OPEN 0x01 /* device is open */
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#define LPT_OBUSY 0x02 /* printer is busy doing output */
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#define LPT_INIT 0x04 /* waiting to initialize for open */
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u_char sc_flags;
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#define LPT_AUTOLF 0x20 /* automatic LF on CR */
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#define LPT_NOPRIME 0x40 /* don't prime on open */
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#define LPT_NOINTR 0x80 /* do not use interrupt */
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u_char sc_control;
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u_char sc_laststatus;
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};
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int lptprobe __P((struct device *, void *, void *));
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void lptattach __P((struct device *, struct device *, void *));
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int lptintr __P((struct lpt_softc *));
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struct cfdriver lptcd = {
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NULL, "lpt", lptprobe, lptattach, DV_TTY, sizeof(struct lpt_softc)
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};
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#define LPTUNIT(s) (minor(s) & 0x1f)
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#define LPTFLAGS(s) (minor(s) & 0xe0)
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#define LPS_INVERT (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK)
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#define LPS_MASK (LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER)
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#define NOT_READY() ((inb(iobase + lpt_status) ^ LPS_INVERT) & LPS_MASK)
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#define NOT_READY_ERR() not_ready(inb(iobase + lpt_status), sc)
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static int not_ready __P((u_char, struct lpt_softc *));
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static void lptwakeup __P((void *arg));
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static int pushbytes __P((struct lpt_softc *));
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/*
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* Internal routine to lptprobe to do port tests of one byte value.
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*/
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int
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lpt_port_test(port, data, mask)
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int port;
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u_char data, mask;
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{
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int timeout;
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u_char temp;
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data &= mask;
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outb(port, data);
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timeout = 1000;
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do {
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delay(10);
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temp = inb(port) & mask;
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} while (temp != data && --timeout);
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lprintf("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", port, data,
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temp, timeout);
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return (temp == data);
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}
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/*
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* Logic:
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* 1) You should be able to write to and read back the same value
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* to the data port. Do an alternating zeros, alternating ones,
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* walking zero, and walking one test to check for stuck bits.
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*
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* 2) You should be able to write to and read back the same value
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* to the control port lower 5 bits, the upper 3 bits are reserved
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* per the IBM PC technical reference manauls and different boards
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* do different things with them. Do an alternating zeros, alternating
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* ones, walking zero, and walking one test to check for stuck bits.
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*
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* Some printers drag the strobe line down when the are powered off
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* so this bit has been masked out of the control port test.
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*
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* XXX Some printers may not like a fast pulse on init or strobe, I
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* don't know at this point, if that becomes a problem these bits
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* should be turned off in the mask byte for the control port test.
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*
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* 3) Set the data and control ports to a value of 0
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*/
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int
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lptprobe(parent, match, aux)
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struct device *parent;
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void *match, *aux;
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{
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struct isa_attach_args *ia = aux;
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int iobase = ia->ia_iobase;
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int port;
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u_char mask, data;
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int i;
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#ifdef DEBUG
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#define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \
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return 0;} while (0)
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#else
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#define ABORT return 0
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#endif
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port = iobase + lpt_data;
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mask = 0xff;
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for (;;) {
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data = 0x55; /* Alternating zeros */
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if (!lpt_port_test(port, data, mask))
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ABORT;
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data = 0xaa; /* Alternating ones */
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if (!lpt_port_test(port, data, mask))
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ABORT;
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for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */
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data = ~(1 << i);
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if (!lpt_port_test(port, data, mask))
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ABORT;
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}
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for (i = 0; i < CHAR_BIT; i++) { /* Walking one */
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data = (1 << i);
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if (!lpt_port_test(port, data, mask))
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ABORT;
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}
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if (port == iobase + lpt_data) {
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port = iobase + lpt_control;
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#if 1 /* XXX */
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mask = 0x04;
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#else
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mask = 0x1e;
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#endif
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} else
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break;
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}
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outb(iobase + lpt_data, 0);
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outb(iobase + lpt_control, 0);
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ia->ia_iosize = LPT_NPORTS;
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ia->ia_msize = 0;
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return 1;
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}
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void
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lptattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct lpt_softc *sc = (void *)self;
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struct isa_attach_args *ia = aux;
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int iobase = ia->ia_iobase;
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if (ia->ia_irq != IRQUNK)
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printf("\n");
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else
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printf(": polled\n");
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sc->sc_iobase = iobase;
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sc->sc_irq = ia->ia_irq;
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sc->sc_state = 0;
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outb(iobase + lpt_control, LPC_NINIT);
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if (ia->ia_irq != IRQUNK) {
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sc->sc_ih.ih_fun = lptintr;
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sc->sc_ih.ih_arg = sc;
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sc->sc_ih.ih_level = IPL_NONE;
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intr_establish(ia->ia_irq, &sc->sc_ih);
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}
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}
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/*
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* Reset the printer, then wait until it's selected and not busy.
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*/
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int
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lptopen(dev, flag)
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dev_t dev;
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int flag;
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{
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int unit = LPTUNIT(dev);
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u_char flags = LPTFLAGS(dev);
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struct lpt_softc *sc;
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int iobase;
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u_char control;
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int error;
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int spin;
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if (unit >= lptcd.cd_ndevs)
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return ENXIO;
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sc = lptcd.cd_devs[unit];
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if (!sc)
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return ENXIO;
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if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0)
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return ENXIO;
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#ifdef DIAGNOSTIC
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if (sc->sc_state)
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printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
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sc->sc_state);
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#endif
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if (sc->sc_state)
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return EBUSY;
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sc->sc_state = LPT_INIT;
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sc->sc_flags = flags;
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lprintf("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags);
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iobase = sc->sc_iobase;
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if ((flags & LPT_NOPRIME) == 0) {
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/* assert INIT for 100 usec to start up printer */
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outb(iobase + lpt_control, LPC_SELECT);
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delay(100);
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}
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control = LPC_SELECT | LPC_NINIT;
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outb(iobase + lpt_control, control);
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/* wait till ready (printer running diagnostics) */
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for (spin = 0; NOT_READY_ERR(); spin += STEP) {
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if (spin >= TIMEOUT) {
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sc->sc_state = 0;
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return EBUSY;
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}
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/* wait 1/4 second, give up if we get a signal */
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if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen",
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STEP) != EWOULDBLOCK) {
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sc->sc_state = 0;
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return error;
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}
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}
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if ((flags & LPT_NOINTR) == 0)
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control |= LPC_IENABLE;
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if (flags & LPT_AUTOLF)
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control |= LPC_AUTOLF;
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sc->sc_control = control;
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outb(iobase + lpt_control, control);
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sc->sc_inbuf = geteblk(LPT_BSIZE);
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sc->sc_count = 0;
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sc->sc_state = LPT_OPEN;
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if ((sc->sc_flags & LPT_NOINTR) == 0)
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lptwakeup(sc);
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lprintf("%s: opened\n", sc->sc_dev.dv_xname);
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return 0;
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}
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int
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not_ready(status, sc)
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u_char status;
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struct lpt_softc *sc;
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{
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u_char new;
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status = (status ^ LPS_INVERT) & LPS_MASK;
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new = status & ~sc->sc_laststatus;
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sc->sc_laststatus = status;
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if (new & LPS_NOPAPER)
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log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname);
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else if (new & LPS_SELECT)
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log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname);
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else if (new & LPS_NERR)
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log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname);
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return status;
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}
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void
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lptwakeup(arg)
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void *arg;
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{
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struct lpt_softc *sc = arg;
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int s;
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s = spltty();
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lptintr(sc);
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splx(s);
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timeout(lptwakeup, sc, STEP);
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}
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/*
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* Close the device, and free the local line buffer.
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*/
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lptclose(dev, flag)
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dev_t dev;
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int flag;
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{
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int unit = LPTUNIT(dev);
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struct lpt_softc *sc = lptcd.cd_devs[unit];
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int iobase = sc->sc_iobase;
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if (sc->sc_count)
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(void) pushbytes(sc);
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if ((sc->sc_flags & LPT_NOINTR) == 0)
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untimeout(lptwakeup, sc);
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outb(iobase + lpt_control, LPC_NINIT);
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sc->sc_state = 0;
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outb(iobase + lpt_control, LPC_NINIT);
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brelse(sc->sc_inbuf);
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lprintf("%s: closed\n", sc->sc_dev.dv_xname);
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return 0;
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}
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int
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pushbytes(sc)
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struct lpt_softc *sc;
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{
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int iobase = sc->sc_iobase;
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int error;
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if (sc->sc_flags & LPT_NOINTR) {
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int spin, tic;
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u_char control = sc->sc_control;
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while (sc->sc_count > 0) {
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spin = 0;
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while (NOT_READY()) {
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if (++spin < sc->sc_spinmax)
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continue;
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tic = 0;
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/* adapt busy-wait algorithm */
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sc->sc_spinmax++;
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while (NOT_READY_ERR()) {
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/* exponential backoff */
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tic = tic + tic + 1;
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if (tic > TIMEOUT)
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tic = TIMEOUT;
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error = tsleep((caddr_t)sc,
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LPTPRI | PCATCH, "lptpsh", tic);
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if (error != EWOULDBLOCK)
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return error;
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}
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break;
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}
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outb(iobase + lpt_data, *sc->sc_cp++);
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outb(iobase + lpt_control, control | LPC_STROBE);
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sc->sc_count--;
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outb(iobase + lpt_control, control);
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/* adapt busy-wait algorithm */
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if (spin*2 + 16 < sc->sc_spinmax)
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sc->sc_spinmax--;
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}
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} else {
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int s;
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while (sc->sc_count > 0) {
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/* if the printer is ready for a char, give it one */
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if ((sc->sc_state & LPT_OBUSY) == 0) {
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lprintf("%s: write %d\n", sc->sc_dev.dv_xname,
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sc->sc_count);
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s = spltty();
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(void) lptintr(sc);
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splx(s);
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}
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if (error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
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"lptwrite2", 0))
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return error;
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}
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}
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return 0;
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}
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/*
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* Copy a line from user space to a local buffer, then call putc to get the
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* chars moved to the output queue.
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*/
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lptwrite(dev, uio)
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dev_t dev;
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struct uio *uio;
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{
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struct lpt_softc *sc = lptcd.cd_devs[LPTUNIT(dev)];
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size_t n;
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int error = 0;
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while (n = min(LPT_BSIZE, uio->uio_resid)) {
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uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
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sc->sc_count = n;
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error = pushbytes(sc);
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if (error) {
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/*
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* Return accurate residual if interrupted or timed
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* out.
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*/
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uio->uio_resid += sc->sc_count;
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sc->sc_count = 0;
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return error;
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}
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}
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return 0;
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}
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/*
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* Handle printer interrupts which occur when the printer is ready to accept
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* another char.
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*/
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int
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lptintr(sc)
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struct lpt_softc *sc;
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{
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int iobase = sc->sc_iobase;
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#if 0
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if ((sc->sc_state & LPT_OPEN) == 0)
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return 0;
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#endif
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/* is printer online and ready for output */
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if (NOT_READY() && NOT_READY_ERR())
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return 0;
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if (sc->sc_count) {
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u_char control = sc->sc_control;
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/* send char */
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outb(iobase + lpt_data, *sc->sc_cp++);
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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;
|
|
}
|