1 /* $NetBSD: lpt_pioc.c,v 1.13 2019/12/27 09:28:41 msaitoh 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 1.13 2019/12/27 09:28:41 msaitoh Exp $"); 40 41 #include <sys/systm.h> 42 #include <sys/kernel.h> 43 #include <sys/device.h> 44 #include <sys/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 (bus_space_tag_t, bus_space_handle_t, bus_addr_t, 55 bus_size_t, u_char, u_char); 56 static int lptprobe (bus_space_tag_t, u_int); 57 static int lpt_pioc_probe (device_t, cfdata_t , void *); 58 static void lpt_pioc_attach (device_t, device_t, void *); 59 60 /* device attach structure */ 61 62 CFATTACH_DECL_NEW(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(bus_space_tag_t iot, bus_space_handle_t ioh, 70 bus_addr_t base, bus_size_t off, u_char data, u_char mask) 71 { 72 int timeout; 73 u_char temp; 74 75 data &= mask; 76 bus_space_write_1(iot, ioh, off, data); 77 timeout = 1000; 78 do { 79 delay(10); 80 temp = bus_space_read_1(iot, ioh, off) & mask; 81 } while (temp != data && --timeout); 82 return (temp == data); 83 } 84 85 /* 86 * Logic: 87 * 1) You should be able to write to and read back the same value 88 * to the data port. Do an alternating zeros, alternating ones, 89 * walking zero, and walking one test to check for stuck bits. 90 * 91 * 2) You should be able to write to and read back the same value 92 * to the control port lower 5 bits, the upper 3 bits are reserved 93 * per the IBM PC technical reference manuals and different boards 94 * do different things with them. Do an alternating zeros, alternating 95 * ones, walking zero, and walking one test to check for stuck bits. 96 * 97 * Some printers drag the strobe line down when the are powered off 98 * so this bit has been masked out of the control port test. 99 * 100 * XXX Some printers may not like a fast pulse on init or strobe, I 101 * don't know at this point, if that becomes a problem these bits 102 * should be turned off in the mask byte for the control port test. 103 * 104 * 3) Set the data and control ports to a value of 0 105 */ 106 static int 107 lptprobe(bus_space_tag_t iot, u_int iobase) 108 { 109 bus_space_handle_t ioh; 110 u_char mask, data; 111 int i, rv; 112 #ifdef DEBUG 113 #define ABORT do {printf("lptprobe: mask %x data %x failed\n", mask, data); \ 114 goto out;} while (0) 115 #else 116 #define ABORT goto out 117 #endif 118 119 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) 120 return 0; 121 rv = 0; 122 mask = 0xff; 123 124 data = 0x55; /* Alternating zeros */ 125 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 126 ABORT; 127 128 data = 0xaa; /* Alternating ones */ 129 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 130 ABORT; 131 132 for (i = 0; i < CHAR_BIT; i++) { /* Walking zero */ 133 data = ~(1 << i); 134 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 135 ABORT; 136 } 137 138 for (i = 0; i < CHAR_BIT; i++) { /* Walking one */ 139 data = (1 << i); 140 if (!lpt_port_test(iot, ioh, iobase, lpt_data, data, mask)) 141 ABORT; 142 } 143 144 bus_space_write_1(iot, ioh, lpt_data, 0); 145 bus_space_write_1(iot, ioh, lpt_control, 0); 146 147 rv = LPT_NPORTS; 148 149 out: 150 bus_space_unmap(iot, ioh, LPT_NPORTS); 151 return rv; 152 } 153 154 /* 155 * int lpt_pioc_probe(device_t parent, cfdata_t cf, void *aux) 156 * 157 * Make sure we are trying to attach a lpt device and then 158 * probe for one. 159 */ 160 161 static int 162 lpt_pioc_probe(device_t parent, cfdata_t match, void *aux) 163 { 164 struct pioc_attach_args *pa = aux; 165 int rv; 166 167 if (pa->pa_name && strcmp(pa->pa_name, "lpt") != 0) 168 return(0); 169 170 /* We need an offset */ 171 if (pa->pa_offset == PIOCCF_OFFSET_DEFAULT) 172 return(0); 173 174 rv = lptprobe(pa->pa_iot, pa->pa_iobase + pa->pa_offset); 175 176 if (rv) { 177 pa->pa_iosize = rv; 178 return(1); 179 } 180 return(0); 181 } 182 183 /* 184 * void lpt_pioc_attach(device_t parent, device_t self, void *aux) 185 * 186 * attach the lpt device 187 */ 188 189 static void 190 lpt_pioc_attach(device_t parent, device_t self, void *aux) 191 { 192 struct lpt_softc *sc = device_private(self); 193 struct pioc_attach_args *pa = aux; 194 bus_space_tag_t iot; 195 bus_space_handle_t ioh; 196 u_int iobase; 197 198 sc->sc_dev = self; 199 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 200 aprint_normal("\n"); 201 else 202 aprint_normal(": polled\n"); 203 204 iobase = pa->pa_iobase + pa->pa_offset; 205 206 iot = sc->sc_iot = pa->pa_iot; 207 if (bus_space_map(iot, iobase, LPT_NPORTS, 0, &ioh)) { 208 aprint_error_dev(self, "couldn't map I/O ports"); 209 return; 210 } 211 sc->sc_ioh = ioh; 212 213 lpt_attach_subr(sc); 214 215 if (pa->pa_irq != MAINBUSCF_IRQ_DEFAULT) 216 sc->sc_ih = intr_claim(pa->pa_irq, IPL_TTY, "lpt", 217 lptintr, sc); 218 } 219 220 /* End of lpt_pioc.c */ 221
Indexes created Sat Sep 20 22:09:52 GMT 2025