/* $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); }
