192 lines
6.2 KiB
C
192 lines
6.2 KiB
C
/* $OpenBSD: lpt_isa.c,v 1.17 2022/04/06 18:59:28 naddy 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 <dev/isa/isavar.h>
|
|
#include <dev/ic/lptreg.h>
|
|
#include <dev/ic/lptvar.h>
|
|
|
|
int lpt_isa_probe(struct device *, void *, void *);
|
|
void lpt_isa_attach(struct device *, struct device *, void *);
|
|
|
|
const struct cfattach lpt_isa_ca = {
|
|
sizeof(struct lpt_softc), lpt_isa_probe, lpt_isa_attach, NULL,
|
|
lpt_activate
|
|
};
|
|
|
|
/*
|
|
* 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 manuals 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(struct device *parent, void *match, void *aux)
|
|
{
|
|
#if !defined(__NO_ISA_INTR_CHECK)
|
|
struct isa_softc *sc = (struct isa_softc *)parent;
|
|
#endif
|
|
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 == 0x666) ? 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);
|
|
|
|
/*
|
|
* Check if the specified IRQ is available. If not revert to
|
|
* polled mode.
|
|
*/
|
|
#if !defined(__NO_ISA_INTR_CHECK)
|
|
if (ia->ia_irq != IRQUNK &&
|
|
!isa_intr_check(sc->sc_ic, ia->ia_irq, IST_EDGE))
|
|
ia->ia_irq = IRQUNK;
|
|
#endif
|
|
ia->ia_msize = 0;
|
|
ia->ia_iosize = iosz;
|
|
|
|
rv = 1;
|
|
|
|
out:
|
|
bus_space_unmap(iot, ioh, iosz);
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
lpt_isa_attach(struct device *parent, struct device *self, void *aux)
|
|
{
|
|
struct lpt_softc *sc = (void *)self;
|
|
struct isa_attach_args *ia = aux;
|
|
|
|
sc->sc_state = 0;
|
|
sc->sc_iot = ia->ia_iot;
|
|
if (bus_space_map(sc->sc_iot, ia->ia_iobase, ia->ia_iosize, 0,
|
|
&sc->sc_ioh))
|
|
panic("lpt_isa_attach: couldn't map I/O ports");
|
|
|
|
if (ia->ia_irq == IRQUNK) {
|
|
sc->sc_flags |= LPT_POLLED;
|
|
printf(": polled");
|
|
}
|
|
|
|
lpt_attach_common(sc);
|
|
|
|
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);
|
|
}
|