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/* $OpenBSD: lpt_isa.c,v 1.6 1997/10/07 05:33:25 mickey 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/device.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/isa/isavar.h>
#include <dev/ic/lptreg.h>
#include <dev/ic/lptvar.h>
int lpt_isa_probe __P((struct device *, void *, void *));
void lpt_isa_attach __P((struct device *, struct device *, void *));
struct cfattach lpt_isa_ca = {
sizeof(struct lpt_softc), lpt_isa_probe, lpt_isa_attach
};
/*
* 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
lpt_isa_probe(parent, match, aux)
struct device *parent;
void *match, *aux;
{
struct isa_attach_args *ia = aux;
bus_space_tag_t iot;
bus_space_handle_t ioh;
bus_addr_t base;
u_int8_t mask, data;
int i, rv, iosz;
#ifdef DEBUG
#define ABORT \
do { \
printf("lpt_isa_probe: mask %x data %x failed\n", mask, \
data); \
goto out; \
} while (0)
#else
#define ABORT goto out
#endif
iot = ia->ia_iot;
base = ia->ia_iobase;
iosz = (ia->ia_iosize == -1) ? LPT_NPORTS : ia->ia_iosize;
if (bus_space_map(iot, base, iosz, 0, &ioh))
return 0;
rv = 0;
mask = 0xff;
data = 0x55; /* Alternating zeros */
if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
ABORT;
data = 0xaa; /* Alternating ones */
if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
ABORT;
for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */
data = ~(1 << i);
if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
ABORT;
}
for (i = 0; i < CHAR_BIT; i++) { /* Walking one */
data = (1 << i);
if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask))
ABORT;
}
bus_space_write_1(iot, ioh, lpt_data, 0);
bus_space_write_1(iot, ioh, lpt_control, 0);
ia->ia_msize = 0;
rv = 1;
out:
bus_space_unmap(iot, ioh, iosz);
return rv;
}
void
lpt_isa_attach(parent, self, aux)
struct device *parent, *self;
void *aux;
{
struct lpt_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
bus_space_tag_t iot;
bus_space_handle_t ioh;
if (ia->ia_irq != IRQUNK)
printf("\n");
else {
sc->sc_flags |= LPT_POLLED;
printf(": polled\n");
}
sc->sc_state = 0;
iot = sc->sc_iot = ia->ia_iot;
if (ia->ia_iosize == -1)
ia->ia_iosize = LPT_NPORTS;
if (bus_space_map(iot, ia->ia_iobase, ia->ia_iosize, 0, &ioh))
panic("lpt_isa_attach: couldn't map I/O ports");
sc->sc_ioh = ioh;
bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
if (ia->ia_irq != IRQUNK)
sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
IPL_TTY, lptintr, sc, sc->sc_dev.dv_xname);
}
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