lpt_isa.c revision 1.51
1 /* $NetBSD: lpt_isa.c,v 1.51 2001/11/13 08:01:24 lukem 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/cdefs.h> 57 __KERNEL_RCSID(0, "$NetBSD: lpt_isa.c,v 1.51 2001/11/13 08:01:24 lukem Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/proc.h> 62 #include <sys/user.h> 63 #include <sys/buf.h> 64 #include <sys/kernel.h> 65 #include <sys/ioctl.h> 66 #include <sys/uio.h> 67 #include <sys/device.h> 68 #include <sys/syslog.h> 69 70 #include <machine/bus.h> 71 #include <machine/intr.h> 72 73 #include <dev/isa/isavar.h> 74 #include <dev/ic/lptreg.h> 75 #include <dev/ic/lptvar.h> 76 77 #define LPTPRI (PZERO+8) 78 #define LPT_BSIZE 1024 79 80 #ifndef LPTDEBUG 81 #define LPRINTF(a) 82 #else 83 #define LPRINTF(a) if (lpt_isa_debug) printf a 84 int lpt_isa_debug = 0; 85 #endif 86 87 struct lpt_isa_softc { 88 struct lpt_softc sc_lpt; 89 int sc_irq; 90 91 }; 92 93 int lpt_isa_probe __P((struct device *, struct cfdata *, void *)); 94 void lpt_isa_attach __P((struct device *, struct device *, void *)); 95 96 struct cfattach lpt_isa_ca = { 97 sizeof(struct lpt_isa_softc), lpt_isa_probe, lpt_isa_attach 98 }; 99 100 int lpt_port_test __P((bus_space_tag_t, bus_space_handle_t, bus_addr_t, 101 bus_size_t, u_char, u_char)); 102 103 /* 104 * Internal routine to lptprobe to do port tests of one byte value. 105 */ 106 int 107 lpt_port_test(iot, ioh, base, off, data, mask) 108 bus_space_tag_t iot; 109 bus_space_handle_t ioh; 110 bus_addr_t base; 111 bus_size_t off; 112 u_char data, mask; 113 { 114 int timeout; 115 u_char temp; 116 117 data &= mask; 118 bus_space_write_1(iot, ioh, off, data); 119 timeout = 1000; 120 do { 121 delay(10); 122 temp = bus_space_read_1(iot, ioh, off) & mask; 123 } while (temp != data && --timeout); 124 LPRINTF(("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", 125 (unsigned)(base + off), (unsigned)data, (unsigned)temp, timeout)); 126 return (temp == data); 127 } 128 129 /* 130 * Logic: 131 * 1) You should be able to write to and read back the same value 132 * to the data port. Do an alternating zeros, alternating ones, 133 * walking zero, and walking one test to check for stuck bits. 134 * 135 * 2) You should be able to write to and read back the same value 136 * to the control port lower 5 bits, the upper 3 bits are reserved 137 * per the IBM PC technical reference manauls and different boards 138 * do different things with them. Do an alternating zeros, alternating 139 * ones, walking zero, and walking one test to check for stuck bits. 140 * 141 * Some printers drag the strobe line down when the are powered off 142 * so this bit has been masked out of the control port test. 143 * 144 * XXX Some printers may not like a fast pulse on init or strobe, I 145 * don't know at this point, if that becomes a problem these bits 146 * should be turned off in the mask byte for the control port test. 147 * 148 * 3) Set the data and control ports to a value of 0 149 */ 150 int 151 lpt_isa_probe(parent, match, aux) 152 struct device *parent; 153 struct cfdata *match; 154 void *aux; 155 { 156 struct isa_attach_args *ia = aux; 157 bus_space_tag_t iot; 158 bus_space_handle_t ioh; 159 u_long base; 160 u_char mask, data; 161 int i, rv; 162 163 #ifdef DEBUG 164 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 165 goto out;} while (0) 166 #else 167 #define ABORT goto out 168 #endif 169 170 /* Disallow wildcarded i/o address. */ 171 if (ia->ia_iobase == ISACF_PORT_DEFAULT) 172 return (0); 173 174 iot = ia->ia_iot; 175 base = ia->ia_iobase; 176 if (bus_space_map(iot, base, LPT_NPORTS, 0, &ioh)) 177 return 0; 178 179 rv = 0; 180 mask = 0xff; 181 182 data = 0x55; /* Alternating zeros */ 183 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 184 ABORT; 185 186 data = 0xaa; /* Alternating ones */ 187 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 188 ABORT; 189 190 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 191 data = ~(1 << i); 192 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 193 ABORT; 194 } 195 196 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 197 data = (1 << i); 198 if (!lpt_port_test(iot, ioh, base, lpt_data, data, mask)) 199 ABORT; 200 } 201 202 bus_space_write_1(iot, ioh, lpt_data, 0); 203 bus_space_write_1(iot, ioh, lpt_control, 0); 204 205 ia->ia_iosize = LPT_NPORTS; 206 ia->ia_msize = 0; 207 208 rv = 1; 209 210 out: 211 bus_space_unmap(iot, ioh, LPT_NPORTS); 212 return rv; 213 } 214 215 void 216 lpt_isa_attach(parent, self, aux) 217 struct device *parent, *self; 218 void *aux; 219 { 220 struct lpt_isa_softc *sc = (void *)self; 221 struct lpt_softc *lsc = &sc->sc_lpt; 222 struct isa_attach_args *ia = aux; 223 bus_space_tag_t iot; 224 bus_space_handle_t ioh; 225 226 if (ia->ia_irq != IRQUNK) 227 printf("\n"); 228 else 229 printf(": polled\n"); 230 231 sc->sc_irq = ia->ia_irq; 232 233 iot = lsc->sc_iot = ia->ia_iot; 234 if (bus_space_map(iot, ia->ia_iobase, LPT_NPORTS, 0, &ioh)) { 235 printf("%s: can't map i/o space\n", self->dv_xname); 236 return; 237 } 238 lsc->sc_ioh = ioh; 239 240 lpt_attach_subr(lsc); 241 242 if (ia->ia_irq != IRQUNK) 243 lsc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 244 IPL_TTY, lptintr, lsc); 245 } 246 247
Indexes created Tue Sep 30 20:09:53 GMT 2025