lpt_pioc.c revision 1.3
1 /* $NetBSD: lpt_pioc.c,v 1.3 2002/02/17 23:45:29 bjh21 Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Mark Brinicombe 5 * Copyright (c) 1997 Causality Limited 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. The name of the company nor the name of the author may be used to 17 * endorse or promote products derived from this software without specific 18 * prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 21 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 22 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTERS BE LIABLE FOR ANY DIRECT, 24 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 25 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 26 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * Device Driver for AT parallel printer port 35 */ 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/device.h> 41 #include <machine/bus.h> 42 #include <machine/intr.h> 43 #include <acorn32/mainbus/piocvar.h> 44 #include <dev/ic/lptreg.h> 45 #include <dev/ic/lptvar.h> 46 47 #include "locators.h" 48 49 /* Prototypes for functions */ 50 51 static int lpt_port_test __P((bus_space_tag_t, bus_space_handle_t, bus_addr_t, 52 bus_size_t, u_char, u_char)); 53 static int lptprobe __P((bus_space_tag_t, u_int)); 54 static int lpt_pioc_probe __P((struct device *, struct cfdata *, void *)); 55 static void lpt_pioc_attach __P((struct device *, struct device *, void *)); 56 57 /* device attach structure */ 58 59 struct cfattach lpt_pioc_ca = { 60 sizeof(struct lpt_softc), lpt_pioc_probe, lpt_pioc_attach 61 }; 62 63 /* 64 * Internal routine to lptprobe to do port tests of one byte value. 65 */ 66 static int 67 lpt_port_test(iot, ioh, base, off, data, mask) 68 bus_space_tag_t iot; 69 bus_space_handle_t ioh; 70 bus_addr_t base; 71 bus_size_t off; 72 u_char data, mask; 73 { 74 int timeout; 75 u_char temp; 76 77 data &= mask; 78 bus_space_write_1(iot, ioh, off, data); 79 timeout = 1000; 80 do { 81 delay(10); 82 temp = bus_space_read_1(iot, ioh, off) & mask; 83 } while (temp != data && --timeout); 84 return (temp == data); 85 } 86 87 /* 88 * Logic: 89 * 1) You should be able to write to and read back the same value 90 * to the data port. Do an alternating zeros, alternating ones, 91 * walking zero, and walking one test to check for stuck bits. 92 * 93 * 2) You should be able to write to and read back the same value 94 * to the control port lower 5 bits, the upper 3 bits are reserved 95 * per the IBM PC technical reference manauls and different boards 96 * do different things with them. Do an alternating zeros, alternating 97 * ones, walking zero, and walking one test to check for stuck bits. 98 * 99 * Some printers drag the strobe line down when the are powered off 100 * so this bit has been masked out of the control port test. 101 * 102 * XXX Some printers may not like a fast pulse on init or strobe, I 103 * don't know at this point, if that becomes a problem these bits 104 * should be turned off in the mask byte for the control port test. 105 * 106 * 3) Set the data and control ports to a value of 0 107 */ 108 static int 109 lptprobe(iot, iobase) 110 bus_space_tag_t iot; 111 u_int iobase; 112 { 113 bus_space_handle_t ioh; 114 u_char mask, data; 115 int i, rv; 116 #ifdef DEBUG 117 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 118 goto out;} while (0) 119 #else 120 #define ABORT goto out 121 #endif 122 123 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) 124 return 0; 125 rv = 0; 126 mask = 0xff; 127 128 data = 0x55; /* Alternating zeros */ 129 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 130 ABORT; 131 132 data = 0xaa; /* Alternating ones */ 133 if (!lpt_port_test(iot, ioh, iobase, 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, iobase, 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, iobase, 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 rv = LPT_NPORTS; 152 153 out: 154 bus_space_unmap(iot, ioh, LPT_NPORTS); 155 return rv; 156 } 157 158 /* 159 * int lpt_pioc_probe(struct device *parent, struct cfdata *cf, void *aux) 160 * 161 * Make sure we are trying to attach a lpt device and then 162 * probe for one. 163 */ 164 165 static int 166 lpt_pioc_probe(parent, match, aux) 167 struct device *parent; 168 struct cfdata *match; 169 void *aux; 170 { 171 struct pioc_attach_args *pa = aux; 172 int rv; 173 174 if (pa->pa_name && strcmp(pa->pa_name, "lpt") != 0) 175 return(0); 176 177 /* We need an offset */ 178 if (pa->pa_offset == PIOCCF_OFFSET_DEFAULT) 179 return(0); 180 181 rv = lptprobe(pa->pa_iot, pa->pa_iobase + pa->pa_offset); 182 183 if (rv) { 184 pa->pa_iosize = rv; 185 return(1); 186 } 187 return(0); 188 } 189 190 /* 191 * void lpt_pioc_attach(struct device *parent, struct device *self, void *aux) 192 * 193 * attach the lpt device 194 */ 195 196 static void 197 lpt_pioc_attach(parent, self, aux) 198 struct device *parent, *self; 199 void *aux; 200 { 201 struct lpt_softc *sc = (void *)self; 202 struct pioc_attach_args *pa = aux; 203 bus_space_tag_t iot; 204 bus_space_handle_t ioh; 205 u_int iobase; 206 207 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 208 printf("\n"); 209 else 210 printf(": polled\n"); 211 212 iobase = pa->pa_iobase + pa->pa_offset; 213 214 iot = sc->sc_iot = pa->pa_iot; 215 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) 216 panic("lptattach: couldn't map I/O ports"); 217 sc->sc_ioh = ioh; 218 219 lpt_attach_subr(sc); 220 221 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 222 sc->sc_ih = intr_claim(pa->pa_irq, IPL_TTY, "lpt", 223 lptintr, sc); 224 } 225 226 /* End of lpt_pioc.c */ 227
Indexes created Wed Oct 22 13:09:56 GMT 2025