224 lines
6.0 KiB
C
224 lines
6.0 KiB
C
/* $NetBSD: lpt_pioc.c,v 1.2 2001/11/27 00:53:11 thorpej Exp $ */
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/*
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* Copyright (c) 1997 Mark Brinicombe
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* Copyright (c) 1997 Causality Limited
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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. The name of the company nor the name of the author may be used to
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* endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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/kernel.h>
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#include <sys/device.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <acorn32/mainbus/piocvar.h>
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#include <dev/ic/lptreg.h>
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#include <dev/ic/lptvar.h>
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#include "locators.h"
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/* Prototypes for functions */
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static int lpt_pioc_probe __P((struct device *, struct cfdata *, void *));
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static void lpt_pioc_attach __P((struct device *, struct device *, void *));
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/* device attach structure */
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struct cfattach lpt_pioc_ca = {
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sizeof(struct lpt_softc), lpt_pioc_probe, lpt_pioc_attach
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};
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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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static 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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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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static int
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lptprobe(iot, iobase)
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bus_space_tag_t iot;
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u_int iobase;
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{
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bus_space_handle_t ioh;
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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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if (bus_space_map(iot, iobase, 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, iobase, 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, iobase, 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, iobase, 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, iobase, 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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rv = LPT_NPORTS;
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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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/*
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* int lpt_pioc_probe(struct device *parent, struct cfdata *cf, void *aux)
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*
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* Make sure we are trying to attach a lpt device and then
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* probe for one.
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*/
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static int
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lpt_pioc_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 pioc_attach_args *pa = aux;
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int rv;
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if (pa->pa_name && strcmp(pa->pa_name, "lpt") != 0)
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return(0);
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/* We need an offset */
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if (pa->pa_offset == PIOCCF_OFFSET_DEFAULT)
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return(0);
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rv = lptprobe(pa->pa_iot, pa->pa_iobase + pa->pa_offset);
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if (rv) {
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pa->pa_iosize = rv;
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return(1);
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}
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return(0);
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}
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/*
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* void lpt_pioc_attach(struct device *parent, struct device *self, void *aux)
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*
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* attach the lpt device
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*/
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static void
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lpt_pioc_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_softc *sc = (void *)self;
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struct pioc_attach_args *pa = aux;
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bus_space_tag_t iot;
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bus_space_handle_t ioh;
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u_int iobase;
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if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT)
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printf("\n");
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else
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printf(": polled\n");
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iobase = pa->pa_iobase + pa->pa_offset;
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iot = sc->sc_iot = pa->pa_iot;
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if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh))
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panic("lptattach: couldn't map I/O ports");
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sc->sc_ioh = ioh;
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lpt_attach_subr(sc);
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if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT)
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sc->sc_ih = intr_claim(pa->pa_irq, IPL_TTY, "lpt",
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lptintr, sc);
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}
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/* End of lpt_pioc.c */
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