244 lines
7.1 KiB
C
244 lines
7.1 KiB
C
/* $NetBSD: lpt_isa.c,v 1.50 2000/03/29 03:43:31 simonb Exp $ */
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/*
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* Copyright (c) 1993, 1994 Charles M. 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/bus.h>
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#include <machine/intr.h>
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#include <dev/isa/isavar.h>
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#include <dev/ic/lptreg.h>
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#include <dev/ic/lptvar.h>
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#define LPTPRI (PZERO+8)
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#define LPT_BSIZE 1024
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#ifndef LPTDEBUG
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#define LPRINTF(a)
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#else
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#define LPRINTF(a) if (lpt_isa_debug) printf a
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int lpt_isa_debug = 0;
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#endif
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struct lpt_isa_softc {
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struct lpt_softc sc_lpt;
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int sc_irq;
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};
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int lpt_isa_probe __P((struct device *, struct cfdata *, void *));
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void lpt_isa_attach __P((struct device *, struct device *, void *));
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struct cfattach lpt_isa_ca = {
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sizeof(struct lpt_isa_softc), lpt_isa_probe, lpt_isa_attach
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};
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int lpt_port_test __P((bus_space_tag_t, bus_space_handle_t, bus_addr_t,
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bus_size_t, u_char, u_char));
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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(iot, ioh, base, off, data, mask)
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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bus_addr_t base;
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bus_size_t off;
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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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bus_space_write_1(iot, ioh, off, data);
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timeout = 1000;
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do {
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delay(10);
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temp = bus_space_read_1(iot, ioh, off) & 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",
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(unsigned)(base + off), (unsigned)data, (unsigned)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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lpt_isa_probe(parent, match, aux)
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struct device *parent;
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struct cfdata *match;
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void *aux;
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{
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struct isa_attach_args *ia = aux;
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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u_long base;
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u_char mask, data;
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int i, rv;
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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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goto out;} while (0)
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#else
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#define ABORT goto out
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#endif
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/* Disallow wildcarded i/o address. */
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if (ia->ia_iobase == ISACF_PORT_DEFAULT)
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return (0);
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iot = ia->ia_iot;
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base = ia->ia_iobase;
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if (bus_space_map(iot, base, LPT_NPORTS, 0, &ioh))
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return 0;
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rv = 0;
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mask = 0xff;
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data = 0x55; /* Alternating zeros */
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if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
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ABORT;
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data = 0xaa; /* Alternating ones */
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if (!lpt_port_test(iot, ioh, base, lpt_data, 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(iot, ioh, base, lpt_data, 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(iot, ioh, base, lpt_data, data, mask))
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ABORT;
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}
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bus_space_write_1(iot, ioh, lpt_data, 0);
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bus_space_write_1(iot, ioh, lpt_control, 0);
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ia->ia_iosize = LPT_NPORTS;
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ia->ia_msize = 0;
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rv = 1;
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out:
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bus_space_unmap(iot, ioh, LPT_NPORTS);
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return rv;
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}
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void
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lpt_isa_attach(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_isa_softc *sc = (void *)self;
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struct lpt_softc *lsc = &sc->sc_lpt;
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struct isa_attach_args *ia = aux;
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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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_irq = ia->ia_irq;
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iot = lsc->sc_iot = ia->ia_iot;
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if (bus_space_map(iot, ia->ia_iobase, LPT_NPORTS, 0, &ioh)) {
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printf("%s: can't map i/o space\n", self->dv_xname);
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return;
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}
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lsc->sc_ioh = ioh;
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lpt_attach_subr(lsc);
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if (ia->ia_irq != IRQUNK)
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lsc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
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IPL_TTY, lptintr, lsc);
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}
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