lpt_isa.c revision 1.49
1 /* $NetBSD: lpt_isa.c,v 1.49 1998/08/15 03:02:32 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Charles M. 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/proc.h> 59 #include <sys/user.h> 60 #include <sys/buf.h> 61 #include <sys/kernel.h> 62 #include <sys/ioctl.h> 63 #include <sys/uio.h> 64 #include <sys/device.h> 65 #include <sys/conf.h> 66 #include <sys/syslog.h> 67 68 #include <machine/bus.h> 69 #include <machine/intr.h> 70 71 #include <dev/isa/isavar.h> 72 #include <dev/ic/lptreg.h> 73 #include <dev/ic/lptvar.h> 74 75 #define LPTPRI (PZERO+8) 76 #define LPT_BSIZE 1024 77 78 #ifndef LPTDEBUG 79 #define LPRINTF(a) 80 #else 81 #define LPRINTF(a) if (lpt_isa_debug) printf a 82 int lpt_isa_debug = 0; 83 #endif 84 85 struct lpt_isa_softc { 86 struct lpt_softc sc_lpt; 87 int sc_irq; 88 89 }; 90 91 int lpt_isa_probe __P((struct device *, struct cfdata *, void *)); 92 void lpt_isa_attach __P((struct device *, struct device *, void *)); 93 94 struct cfattach lpt_isa_ca = { 95 sizeof(struct lpt_isa_softc), lpt_isa_probe, lpt_isa_attach 96 }; 97 98 int lpt_port_test __P((bus_space_tag_t, bus_space_handle_t, bus_addr_t, 99 bus_size_t, u_char, u_char)); 100 101 /* 102 * Internal routine to lptprobe to do port tests of one byte value. 103 */ 104 int 105 lpt_port_test(iot, ioh, base, off, data, mask) 106 bus_space_tag_t iot; 107 bus_space_handle_t ioh; 108 bus_addr_t base; 109 bus_size_t off; 110 u_char data, mask; 111 { 112 int timeout; 113 u_char temp; 114 115 data &= mask; 116 bus_space_write_1(iot, ioh, off, data); 117 timeout = 1000; 118 do { 119 delay(10); 120 temp = bus_space_read_1(iot, ioh, off) & mask; 121 } while (temp != data && --timeout); 122 LPRINTF(("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", 123 (unsigned)(base + off), (unsigned)data, (unsigned)temp, timeout)); 124 return (temp == data); 125 } 126 127 /* 128 * Logic: 129 * 1) You should be able to write to and read back the same value 130 * to the data port. Do an alternating zeros, alternating ones, 131 * walking zero, and walking one test to check for stuck bits. 132 * 133 * 2) You should be able to write to and read back the same value 134 * to the control port lower 5 bits, the upper 3 bits are reserved 135 * per the IBM PC technical reference manauls and different boards 136 * do different things with them. Do an alternating zeros, alternating 137 * ones, walking zero, and walking one test to check for stuck bits. 138 * 139 * Some printers drag the strobe line down when the are powered off 140 * so this bit has been masked out of the control port test. 141 * 142 * XXX Some printers may not like a fast pulse on init or strobe, I 143 * don't know at this point, if that becomes a problem these bits 144 * should be turned off in the mask byte for the control port test. 145 * 146 * 3) Set the data and control ports to a value of 0 147 */ 148 int 149 lpt_isa_probe(parent, match, aux) 150 struct device *parent; 151 struct cfdata *match; 152 void *aux; 153 { 154 struct isa_attach_args *ia = aux; 155 bus_space_tag_t iot; 156 bus_space_handle_t ioh; 157 u_long base; 158 u_char mask, data; 159 int i, rv; 160 161 #ifdef DEBUG 162 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 163 goto out;} while (0) 164 #else 165 #define ABORT goto out 166 #endif 167 168 /* Disallow wildcarded i/o address. */ 169 if (ia->ia_iobase == ISACF_PORT_DEFAULT) 170 return (0); 171 172 iot = ia->ia_iot; 173 base = ia->ia_iobase; 174 if (bus_space_map(iot, base, LPT_NPORTS, 0, &ioh)) 175 return 0; 176 177 rv = 0; 178 mask = 0xff; 179 180 data = 0x55; /* Alternating zeros */ 181 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 182 ABORT; 183 184 data = 0xaa; /* Alternating ones */ 185 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 186 ABORT; 187 188 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 189 data = ~(1 << i); 190 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 191 ABORT; 192 } 193 194 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 195 data = (1 << i); 196 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 197 ABORT; 198 } 199 200 bus_space_write_1(iot, ioh, lpt_data, 0); 201 bus_space_write_1(iot, ioh, lpt_control, 0); 202 203 ia->ia_iosize = LPT_NPORTS; 204 ia->ia_msize = 0; 205 206 rv = 1; 207 208 out: 209 bus_space_unmap(iot, ioh, LPT_NPORTS); 210 return rv; 211 } 212 213 void 214 lpt_isa_attach(parent, self, aux) 215 struct device *parent, *self; 216 void *aux; 217 { 218 struct lpt_isa_softc *sc = (void *)self; 219 struct lpt_softc *lsc = &sc->sc_lpt; 220 struct isa_attach_args *ia = aux; 221 bus_space_tag_t iot; 222 bus_space_handle_t ioh; 223 224 if (ia->ia_irq != IRQUNK) 225 printf("\n"); 226 else 227 printf(": polled\n"); 228 229 sc->sc_irq = ia->ia_irq; 230 231 iot = lsc->sc_iot = ia->ia_iot; 232 if (bus_space_map(iot, ia->ia_iobase, LPT_NPORTS, 0, &ioh)) { 233 printf("%s: can't map i/o space\n", self->dv_xname); 234 return; 235 } 236 lsc->sc_ioh = ioh; 237 238 lpt_attach_subr(lsc); 239 240 if (ia->ia_irq != IRQUNK) 241 lsc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 242 IPL_TTY, lptintr, lsc); 243 } 244 245
Indexes created Tue Sep 30 20:09:53 GMT 2025