1 /* $NetBSD: mcclock_pnpbus.c,v 1.11 2023/12/20 15:29:06 thorpej Exp $ */ 2 /*- 3 * Copyright (c) 2006 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Tim Rightnour 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* 32 * PNPBus driver for the mc146818 compatible time-of-day clock found on all 33 * IBM Prep machines. This one is only discernable from the motorola clock 34 * part by the interface portion of the residual data. (or by the small vendor 35 * item chip id) 36 * NOTE: The IBM machines actually have either a dallas 1385 or a dallas 1585 37 * chip. This driver should probably be replaced by something that does that 38 * one day. 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: mcclock_pnpbus.c,v 1.11 2023/12/20 15:29:06 thorpej Exp $"); 43 44 #include <sys/types.h> 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/device.h> 48 49 #include <sys/bus.h> 50 #include <machine/intr.h> 51 #include <machine/isa_machdep.h> 52 #include <machine/residual.h> 53 #include <machine/chpidpnp.h> 54 /* XXX */ 55 #include <machine/pio.h> 56 57 #include <dev/clock_subr.h> 58 #include <dev/ic/mc146818reg.h> 59 #include <dev/ic/mc146818var.h> 60 #include <dev/ic/ds1687reg.h> 61 62 #include <dev/isa/isavar.h> 63 64 #include <prep/pnpbus/pnpbusvar.h> 65 66 static int mcclock_pnpbus_probe(device_t, cfdata_t, void *); 67 static void mcclock_pnpbus_attach(device_t, device_t, void *); 68 69 extern struct cfdriver mcclock_cd; 70 71 CFATTACH_DECL_NEW(mcclock_pnpbus, sizeof(struct mc146818_softc), 72 mcclock_pnpbus_probe, mcclock_pnpbus_attach, NULL, NULL); 73 74 void mcclock_pnpbus_write(struct mc146818_softc *, u_int, u_int); 75 u_int mcclock_pnpbus_read(struct mc146818_softc *, u_int); 76 void ds1585_reboot(void); 77 78 int have_ds1585 = 0; 79 #define MCCLOCK_STD_DEV 0 80 81 static int 82 mcclock_pnpbus_probe(device_t parent, cfdata_t cf, void *aux) 83 { 84 struct pnpbus_dev_attach_args *pna = aux; 85 int ret = 0; 86 87 if (strcmp(pna->pna_devid, "PNP0B00") == 0 && 88 pna->subtype == RealTimeClock && pna->chipid == DallasRTC) 89 ret = 1; 90 if (strcmp(pna->pna_devid, "PNP0B00") == 0 && 91 pna->subtype == RealTimeClock && pna->chipid == Dallas1585) 92 ret = 1; 93 94 if (ret) 95 pnpbus_scan(pna, pna->pna_ppc_dev); 96 return ret; 97 } 98 99 static void 100 mcclock_pnpbus_attach(device_t parent, device_t self, void *aux) 101 { 102 struct mc146818_softc *sc = device_private(self); 103 struct pnpbus_dev_attach_args *pna = aux; 104 105 sc->sc_dev = self; 106 sc->sc_bst = pna->pna_iot; 107 if (pnpbus_io_map(&pna->pna_res, 0, &sc->sc_bst, &sc->sc_bsh)) { 108 /* XXX should we panic instead? */ 109 aprint_error(": couldn't map clock I/O space\n"); 110 return; 111 } 112 113 if (pna->chipid == Dallas1585) 114 have_ds1585 = 1; 115 sc->sc_year0 = 1900; 116 sc->sc_mcread = mcclock_pnpbus_read; 117 sc->sc_mcwrite = mcclock_pnpbus_write; 118 sc->sc_flag = MC146818_BCD; 119 mc146818_attach(sc); 120 121 aprint_normal("\n"); 122 123 (*sc->sc_mcwrite)(sc, MC_REGB, MC_REGB_24HR); 124 } 125 126 void 127 ds1585_reboot(void) 128 { 129 struct mc146818_softc *sc; 130 int i, j; 131 132 if (!have_ds1585) 133 return; 134 135 sc = device_lookup_private(&mcclock_cd, MCCLOCK_STD_DEV); 136 137 /* monitors b0: 05,03,01 b1: 49, WIE=1 */ 138 139 (*sc->sc_mcwrite)(sc, DS1687_ASEC, 0); 140 141 /* If we are nearing 59 minutes on the hour, the math is too complex 142 * to compute out when to reboot, so we just wait for the clock to 143 * flip back over to zero, then set the alarm time. 144 */ 145 i = (*sc->sc_mcread)(sc, DS1687_MIN); 146 if (i == 0x58) { 147 (*sc->sc_mcwrite)(sc, DS1687_AMIN, 0x59); 148 (*sc->sc_mcwrite)(sc, DS1687_ASEC, 0x59); 149 i = 0x59; 150 } else { 151 while (i == 0x59) { 152 delay(100); 153 i = (*sc->sc_mcread)(sc, DS1687_MIN); 154 } 155 i += 2; 156 if ((i & 0x0f) > 8) 157 i = (i & 0xf0) + 0x10; 158 (*sc->sc_mcwrite)(sc, DS1687_AMIN, i); 159 } 160 i = (*sc->sc_mcread)(sc, DS1687_HOUR); 161 (*sc->sc_mcwrite)(sc, DS1687_AHOUR, i); 162 j = (*sc->sc_mcread)(sc, DS1687_DOM); /* get date */ 163 i = (*sc->sc_mcread)(sc, DS1687_CONTROLA); 164 i |= DS1687_BANK1; /* set DV0 on */ 165 (*sc->sc_mcwrite)(sc, DS1687_CONTROLA, i); 166 /* write today into wakeup */ 167 (*sc->sc_mcwrite)(sc, DS1687_BANK1_ADATE, j); 168 i = (*sc->sc_mcread)(sc, 0x4b); /* bank1 reg B */ 169 i |= 0x82; /* WIE + ABE */ 170 (*sc->sc_mcwrite)(sc, 0x4b, i); 171 i = (*sc->sc_mcread)(sc, 0x4b); 172 /* XXX power control bit on 7024/7025 */ 173 outb(PREP_BUS_SPACE_IO + 0x856, 1); 174 for (;;); 175 } 176 177 void 178 mcclock_pnpbus_write(struct mc146818_softc *sc, u_int reg, u_int datum) 179 { 180 bus_space_tag_t iot; 181 bus_space_handle_t ioh; 182 183 iot = sc->sc_bst; 184 ioh = sc->sc_bsh; 185 186 bus_space_write_1(iot, ioh, 0, reg); 187 bus_space_write_1(iot, ioh, 1, datum); 188 } 189 190 u_int 191 mcclock_pnpbus_read(struct mc146818_softc *sc, u_int reg) 192 { 193 bus_space_tag_t iot; 194 bus_space_handle_t ioh; 195 u_int datum; 196 197 iot = sc->sc_bst; 198 ioh = sc->sc_bsh; 199 200 bus_space_write_1(iot, ioh, 0, reg); 201 datum = bus_space_read_1(iot, ioh, 1); 202 203 return (datum); 204 } 205
Indexes created Sat Sep 27 14:09:57 GMT 2025