1 /* $OpenBSD: lpt_isa.c,v 1.16 2021/03/07 06:17:04 jsg Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Charles Hannum. 5 * Copyright (c) 1990 William F. Jolitz, TeleMuse 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This software is a component of "386BSD" developed by 19 * William F. Jolitz, TeleMuse. 20 * 4. Neither the name of the developer nor the name "386BSD" 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 25 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 26 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 27 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 28 * NOT MAKE USE OF THIS WORK. 29 * 30 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 31 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 32 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 33 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 34 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 35 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 36 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 37 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 40 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 42 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 45 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 47 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 48 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 49 * SUCH DAMAGE. 50 */ 51 52 /* 53 * Device Driver for AT parallel printer port 54 */ 55 56 #include <sys/param.h> 57 #include <sys/systm.h> 58 #include <sys/device.h> 59 60 #include <machine/bus.h> 61 62 #include <dev/isa/isavar.h> 63 #include <dev/ic/lptreg.h> 64 #include <dev/ic/lptvar.h> 65 66 int lpt_isa_probe(struct device *, void *, void *); 67 void lpt_isa_attach(struct device *, struct device *, void *); 68 69 struct cfattach lpt_isa_ca = { 70 sizeof(struct lpt_softc), lpt_isa_probe, lpt_isa_attach, NULL, 71 lpt_activate 72 }; 73 74 /* 75 * Logic: 76 * 1) You should be able to write to and read back the same value 77 * to the data port. Do an alternating zeros, alternating ones, 78 * walking zero, and walking one test to check for stuck bits. 79 * 80 * 2) You should be able to write to and read back the same value 81 * to the control port lower 5 bits, the upper 3 bits are reserved 82 * per the IBM PC technical reference manuals and different boards 83 * do different things with them. Do an alternating zeros, alternating 84 * ones, walking zero, and walking one test to check for stuck bits. 85 * 86 * Some printers drag the strobe line down when the are powered off 87 * so this bit has been masked out of the control port test. 88 * 89 * XXX Some printers may not like a fast pulse on init or strobe, I 90 * don't know at this point, if that becomes a problem these bits 91 * should be turned off in the mask byte for the control port test. 92 * 93 * 3) Set the data and control ports to a value of 0 94 */ 95 int 96 lpt_isa_probe(struct device *parent, void *match, void *aux) 97 { 98 #if !defined(__NO_ISA_INTR_CHECK) 99 struct isa_softc *sc = (struct isa_softc *)parent; 100 #endif 101 struct isa_attach_args *ia = aux; 102 bus_space_tag_t iot; 103 bus_space_handle_t ioh; 104 bus_addr_t base; 105 u_int8_t mask, data; 106 int i, rv, iosz; 107 108 #ifdef DEBUG 109 #define ABORT \ 110 do { \ 111 printf("lpt_isa_probe: mask %x data %x failed\n", mask, \ 112 data); \ 113 goto out; \ 114 } while (0) 115 #else 116 #define ABORT goto out 117 #endif 118 119 iot = ia->ia_iot; 120 base = ia->ia_iobase; 121 iosz = (ia->ia_iosize == 0x666) ? LPT_NPORTS : ia->ia_iosize; 122 if (bus_space_map(iot, base, iosz, 0, &ioh)) 123 return 0; 124 125 rv = 0; 126 mask = 0xff; 127 128 data = 0x55; /* Alternating zeros */ 129 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 130 ABORT; 131 132 data = 0xaa; /* Alternating ones */ 133 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 134 ABORT; 135 136 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 137 data = ~(1 << i); 138 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 139 ABORT; 140 } 141 142 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 143 data = (1 << i); 144 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 145 ABORT; 146 } 147 148 bus_space_write_1(iot, ioh, lpt_data, 0); 149 bus_space_write_1(iot, ioh, lpt_control, 0); 150 151 /* 152 * Check if the specified IRQ is available. If not revert to 153 * polled mode. 154 */ 155 #if !defined(__NO_ISA_INTR_CHECK) 156 if (ia->ia_irq != IRQUNK && 157 !isa_intr_check(sc->sc_ic, ia->ia_irq, IST_EDGE)) 158 ia->ia_irq = IRQUNK; 159 #endif 160 ia->ia_msize = 0; 161 ia->ia_iosize = iosz; 162 163 rv = 1; 164 165 out: 166 bus_space_unmap(iot, ioh, iosz); 167 return rv; 168 } 169 170 void 171 lpt_isa_attach(struct device *parent, struct device *self, void *aux) 172 { 173 struct lpt_softc *sc = (void *)self; 174 struct isa_attach_args *ia = aux; 175 176 sc->sc_state = 0; 177 sc->sc_iot = ia->ia_iot; 178 if (bus_space_map(sc->sc_iot, ia->ia_iobase, ia->ia_iosize, 0, 179 &sc->sc_ioh)) 180 panic("lpt_isa_attach: couldn't map I/O ports"); 181 182 if (ia->ia_irq == IRQUNK) { 183 sc->sc_flags |= LPT_POLLED; 184 printf(": polled"); 185 } 186 187 lpt_attach_common(sc); 188 189 if (ia->ia_irq != IRQUNK) 190 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 191 IPL_TTY, lptintr, sc, sc->sc_dev.dv_xname); 192 } 193