1 /* $NetBSD: lpt_pioc.c,v 1.5 2002/03/10 15:47:44 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 39 __KERNEL_RCSID(0, "$NetBSD: lpt_pioc.c,v 1.5 2002/03/10 15:47:44 bjh21 Exp $"); 40 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/device.h> 44 #include <machine/bus.h> 45 #include <machine/intr.h> 46 #include <acorn32/mainbus/piocvar.h> 47 #include <dev/ic/lptreg.h> 48 #include <dev/ic/lptvar.h> 49 50 #include "locators.h" 51 52 /* Prototypes for functions */ 53 54 static int lpt_port_test __P((bus_space_tag_t, bus_space_handle_t, bus_addr_t, 55 bus_size_t, u_char, u_char)); 56 static int lptprobe __P((bus_space_tag_t, u_int)); 57 static int lpt_pioc_probe __P((struct device *, struct cfdata *, void *)); 58 static void lpt_pioc_attach __P((struct device *, struct device *, void *)); 59 60 /* device attach structure */ 61 62 struct cfattach lpt_pioc_ca = { 63 sizeof(struct lpt_softc), lpt_pioc_probe, lpt_pioc_attach 64 }; 65 66 /* 67 * Internal routine to lptprobe to do port tests of one byte value. 68 */ 69 static int 70 lpt_port_test(iot, ioh, base, off, data, mask) 71 bus_space_tag_t iot; 72 bus_space_handle_t ioh; 73 bus_addr_t base; 74 bus_size_t off; 75 u_char data, mask; 76 { 77 int timeout; 78 u_char temp; 79 80 data &= mask; 81 bus_space_write_1(iot, ioh, off, data); 82 timeout = 1000; 83 do { 84 delay(10); 85 temp = bus_space_read_1(iot, ioh, off) & mask; 86 } while (temp != data && --timeout); 87 return (temp == data); 88 } 89 90 /* 91 * Logic: 92 * 1) You should be able to write to and read back the same value 93 * to the data port. Do an alternating zeros, alternating ones, 94 * walking zero, and walking one test to check for stuck bits. 95 * 96 * 2) You should be able to write to and read back the same value 97 * to the control port lower 5 bits, the upper 3 bits are reserved 98 * per the IBM PC technical reference manauls and different boards 99 * do different things with them. Do an alternating zeros, alternating 100 * ones, walking zero, and walking one test to check for stuck bits. 101 * 102 * Some printers drag the strobe line down when the are powered off 103 * so this bit has been masked out of the control port test. 104 * 105 * XXX Some printers may not like a fast pulse on init or strobe, I 106 * don't know at this point, if that becomes a problem these bits 107 * should be turned off in the mask byte for the control port test. 108 * 109 * 3) Set the data and control ports to a value of 0 110 */ 111 static int 112 lptprobe(iot, iobase) 113 bus_space_tag_t iot; 114 u_int iobase; 115 { 116 bus_space_handle_t ioh; 117 u_char mask, data; 118 int i, rv; 119 #ifdef DEBUG 120 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 121 goto out;} while (0) 122 #else 123 #define ABORT goto out 124 #endif 125 126 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) 127 return 0; 128 rv = 0; 129 mask = 0xff; 130 131 data = 0x55; /* Alternating zeros */ 132 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 133 ABORT; 134 135 data = 0xaa; /* Alternating ones */ 136 if (!lpt_port_test(iot, ioh, iobase, 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, iobase, 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, iobase, 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 rv = LPT_NPORTS; 155 156 out: 157 bus_space_unmap(iot, ioh, LPT_NPORTS); 158 return rv; 159 } 160 161 /* 162 * int lpt_pioc_probe(struct device *parent, struct cfdata *cf, void *aux) 163 * 164 * Make sure we are trying to attach a lpt device and then 165 * probe for one. 166 */ 167 168 static int 169 lpt_pioc_probe(parent, match, aux) 170 struct device *parent; 171 struct cfdata *match; 172 void *aux; 173 { 174 struct pioc_attach_args *pa = aux; 175 int rv; 176 177 if (pa->pa_name && strcmp(pa->pa_name, "lpt") != 0) 178 return(0); 179 180 /* We need an offset */ 181 if (pa->pa_offset == PIOCCF_OFFSET_DEFAULT) 182 return(0); 183 184 rv = lptprobe(pa->pa_iot, pa->pa_iobase + pa->pa_offset); 185 186 if (rv) { 187 pa->pa_iosize = rv; 188 return(1); 189 } 190 return(0); 191 } 192 193 /* 194 * void lpt_pioc_attach(struct device *parent, struct device *self, void *aux) 195 * 196 * attach the lpt device 197 */ 198 199 static void 200 lpt_pioc_attach(parent, self, aux) 201 struct device *parent, *self; 202 void *aux; 203 { 204 struct lpt_softc *sc = (void *)self; 205 struct pioc_attach_args *pa = aux; 206 bus_space_tag_t iot; 207 bus_space_handle_t ioh; 208 u_int iobase; 209 210 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 211 printf("\n"); 212 else 213 printf(": polled\n"); 214 215 iobase = pa->pa_iobase + pa->pa_offset; 216 217 iot = sc->sc_iot = pa->pa_iot; 218 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) 219 panic("lptattach: couldn't map I/O ports"); 220 sc->sc_ioh = ioh; 221 222 lpt_attach_subr(sc); 223 224 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 225 sc->sc_ih = intr_claim(pa->pa_irq, IPL_TTY, "lpt", 226 lptintr, sc); 227 } 228 229 /* End of lpt_pioc.c */ 230