lpt_pioc.c revision 1.1.4.5
1 /* $NetBSD: lpt_pioc.c,v 1.1.4.5 2002/10/18 02:33:39 nathanw 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 1.1.4.5 2002/10/18 02:33:39 nathanw 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 CFATTACH_DECL(lpt_pioc, sizeof(struct lpt_softc), 63 lpt_pioc_probe, lpt_pioc_attach, NULL, NULL); 64 65 /* 66 * Internal routine to lptprobe to do port tests of one byte value. 67 */ 68 static int 69 lpt_port_test(iot, ioh, base, off, data, mask) 70 bus_space_tag_t iot; 71 bus_space_handle_t ioh; 72 bus_addr_t base; 73 bus_size_t off; 74 u_char data, mask; 75 { 76 int timeout; 77 u_char temp; 78 79 data &= mask; 80 bus_space_write_1(iot, ioh, off, data); 81 timeout = 1000; 82 do { 83 delay(10); 84 temp = bus_space_read_1(iot, ioh, off) & mask; 85 } while (temp != data && --timeout); 86 return (temp == data); 87 } 88 89 /* 90 * Logic: 91 * 1) You should be able to write to and read back the same value 92 * to the data port. Do an alternating zeros, alternating ones, 93 * walking zero, and walking one test to check for stuck bits. 94 * 95 * 2) You should be able to write to and read back the same value 96 * to the control port lower 5 bits, the upper 3 bits are reserved 97 * per the IBM PC technical reference manauls and different boards 98 * do different things with them. Do an alternating zeros, alternating 99 * ones, walking zero, and walking one test to check for stuck bits. 100 * 101 * Some printers drag the strobe line down when the are powered off 102 * so this bit has been masked out of the control port test. 103 * 104 * XXX Some printers may not like a fast pulse on init or strobe, I 105 * don't know at this point, if that becomes a problem these bits 106 * should be turned off in the mask byte for the control port test. 107 * 108 * 3) Set the data and control ports to a value of 0 109 */ 110 static int 111 lptprobe(iot, iobase) 112 bus_space_tag_t iot; 113 u_int iobase; 114 { 115 bus_space_handle_t ioh; 116 u_char mask, data; 117 int i, rv; 118 #ifdef DEBUG 119 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 120 goto out;} while (0) 121 #else 122 #define ABORT goto out 123 #endif 124 125 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) 126 return 0; 127 rv = 0; 128 mask = 0xff; 129 130 data = 0x55; /* Alternating zeros */ 131 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 132 ABORT; 133 134 data = 0xaa; /* Alternating ones */ 135 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 136 ABORT; 137 138 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 139 data = ~(1 << i); 140 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 141 ABORT; 142 } 143 144 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 145 data = (1 << i); 146 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 147 ABORT; 148 } 149 150 bus_space_write_1(iot, ioh, lpt_data, 0); 151 bus_space_write_1(iot, ioh, lpt_control, 0); 152 153 rv = LPT_NPORTS; 154 155 out: 156 bus_space_unmap(iot, ioh, LPT_NPORTS); 157 return rv; 158 } 159 160 /* 161 * int lpt_pioc_probe(struct device *parent, struct cfdata *cf, void *aux) 162 * 163 * Make sure we are trying to attach a lpt device and then 164 * probe for one. 165 */ 166 167 static int 168 lpt_pioc_probe(parent, match, aux) 169 struct device *parent; 170 struct cfdata *match; 171 void *aux; 172 { 173 struct pioc_attach_args *pa = aux; 174 int rv; 175 176 if (pa->pa_name && strcmp(pa->pa_name, "lpt") != 0) 177 return(0); 178 179 /* We need an offset */ 180 if (pa->pa_offset == PIOCCF_OFFSET_DEFAULT) 181 return(0); 182 183 rv = lptprobe(pa->pa_iot, pa->pa_iobase + pa->pa_offset); 184 185 if (rv) { 186 pa->pa_iosize = rv; 187 return(1); 188 } 189 return(0); 190 } 191 192 /* 193 * void lpt_pioc_attach(struct device *parent, struct device *self, void *aux) 194 * 195 * attach the lpt device 196 */ 197 198 static void 199 lpt_pioc_attach(parent, self, aux) 200 struct device *parent, *self; 201 void *aux; 202 { 203 struct lpt_softc *sc = (void *)self; 204 struct pioc_attach_args *pa = aux; 205 bus_space_tag_t iot; 206 bus_space_handle_t ioh; 207 u_int iobase; 208 209 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 210 printf("\n"); 211 else 212 printf(": polled\n"); 213 214 iobase = pa->pa_iobase + pa->pa_offset; 215 216 iot = sc->sc_iot = pa->pa_iot; 217 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) 218 panic("lptattach: couldn't map I/O ports"); 219 sc->sc_ioh = ioh; 220 221 lpt_attach_subr(sc); 222 223 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 224 sc->sc_ih = intr_claim(pa->pa_irq, IPL_TTY, "lpt", 225 lptintr, sc); 226 } 227 228 /* End of lpt_pioc.c */ 229
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