1 /* $OpenBSD: lpt_isa.c,v 1.14 2013/06/12 19:07:39 deraadt 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 #include <machine/intr.h> 62 63 #include <dev/isa/isavar.h> 64 #include <dev/ic/lptreg.h> 65 #include <dev/ic/lptvar.h> 66 67 int lpt_isa_probe(struct device *, void *, void *); 68 void lpt_isa_attach(struct device *, struct device *, void *); 69 70 struct cfattach lpt_isa_ca = { 71 sizeof(struct lpt_softc), lpt_isa_probe, lpt_isa_attach, NULL, 72 lpt_activate 73 }; 74 75 /* 76 * Logic: 77 * 1) You should be able to write to and read back the same value 78 * to the data port. Do an alternating zeros, alternating ones, 79 * walking zero, and walking one test to check for stuck bits. 80 * 81 * 2) You should be able to write to and read back the same value 82 * to the control port lower 5 bits, the upper 3 bits are reserved 83 * per the IBM PC technical reference manuals and different boards 84 * do different things with them. Do an alternating zeros, alternating 85 * ones, walking zero, and walking one test to check for stuck bits. 86 * 87 * Some printers drag the strobe line down when the are powered off 88 * so this bit has been masked out of the control port test. 89 * 90 * XXX Some printers may not like a fast pulse on init or strobe, I 91 * don't know at this point, if that becomes a problem these bits 92 * should be turned off in the mask byte for the control port test. 93 * 94 * 3) Set the data and control ports to a value of 0 95 */ 96 int 97 lpt_isa_probe(parent, match, aux) 98 struct device *parent; 99 void *match, *aux; 100 { 101 #if !defined(__NO_ISA_INTR_CHECK) 102 struct isa_softc *sc = (struct isa_softc *)parent; 103 #endif 104 struct isa_attach_args *ia = aux; 105 bus_space_tag_t iot; 106 bus_space_handle_t ioh; 107 bus_addr_t base; 108 u_int8_t mask, data; 109 int i, rv, iosz; 110 111 #ifdef DEBUG 112 #define ABORT \ 113 do { \ 114 printf("lpt_isa_probe: mask %x data %x failed\n", mask, \ 115 data); \ 116 goto out; \ 117 } while (0) 118 #else 119 #define ABORT goto out 120 #endif 121 122 iot = ia->ia_iot; 123 base = ia->ia_iobase; 124 iosz = (ia->ia_iosize == 0x666) ? LPT_NPORTS : ia->ia_iosize; 125 if (bus_space_map(iot, base, iosz, 0, &ioh)) 126 return 0; 127 128 rv = 0; 129 mask = 0xff; 130 131 data = 0x55; /* Alternating zeros */ 132 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 133 ABORT; 134 135 data = 0xaa; /* Alternating ones */ 136 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 137 ABORT; 138 139 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 140 data = ~(1 << i); 141 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 142 ABORT; 143 } 144 145 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 146 data = (1 << i); 147 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 148 ABORT; 149 } 150 151 bus_space_write_1(iot, ioh, lpt_data, 0); 152 bus_space_write_1(iot, ioh, lpt_control, 0); 153 154 /* 155 * Check if the specified IRQ is available. If not revert to 156 * polled mode. 157 */ 158 #if !defined(__NO_ISA_INTR_CHECK) 159 if (ia->ia_irq != IRQUNK && 160 !isa_intr_check(sc->sc_ic, ia->ia_irq, IST_EDGE)) 161 ia->ia_irq = IRQUNK; 162 #endif 163 ia->ia_msize = 0; 164 ia->ia_iosize = iosz; 165 166 rv = 1; 167 168 out: 169 bus_space_unmap(iot, ioh, iosz); 170 return rv; 171 } 172 173 void 174 lpt_isa_attach(parent, self, aux) 175 struct device *parent, *self; 176 void *aux; 177 { 178 struct lpt_softc *sc = (void *)self; 179 struct isa_attach_args *ia = aux; 180 181 sc->sc_state = 0; 182 sc->sc_iot = ia->ia_iot; 183 if (bus_space_map(sc->sc_iot, ia->ia_iobase, ia->ia_iosize, 0, 184 &sc->sc_ioh)) 185 panic("lpt_isa_attach: couldn't map I/O ports"); 186 187 if (ia->ia_irq == IRQUNK) { 188 sc->sc_flags |= LPT_POLLED; 189 printf(": polled"); 190 } 191 192 lpt_attach_common(sc); 193 194 if (ia->ia_irq != IRQUNK) 195 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 196 IPL_TTY, lptintr, sc, sc->sc_dev.dv_xname); 197 } 198