1 /* $NetBSD: mcclock_ofisa.c,v 1.1 2021/04/27 21:39:39 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2021 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * OFW ISA attachment for the mc146818 real time clock. 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: mcclock_ofisa.c,v 1.1 2021/04/27 21:39:39 thorpej Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/device.h> 43 44 #include <sys/bus.h> 45 46 #include <dev/clock_subr.h> 47 #include <dev/ic/mc146818var.h> 48 49 #include <dev/ofw/openfirm.h> 50 #include <dev/isa/isavar.h> 51 #include <dev/ofisa/ofisavar.h> 52 53 struct mcclock_ofisa_platform_data { 54 int year0; 55 int flags; 56 }; 57 58 static const struct device_compatible_entry compat_data[] = { 59 { .compat = "pnpPNP,b00" }, 60 DEVICE_COMPAT_EOL 61 }; 62 63 static const struct mcclock_ofisa_platform_data dec_dnard_data = { 64 .year0 = 1900, 65 .flags = MC146818_BCD, 66 }; 67 68 static const struct device_compatible_entry platform_data[] = { 69 { .compat = "DEC,DNARD", .data = &dec_dnard_data, }, 70 DEVICE_COMPAT_EOL 71 }; 72 73 static const struct mcclock_ofisa_platform_data * 74 lookup_platform_data(char *model, size_t const size) 75 { 76 const struct device_compatible_entry *dce; 77 78 if (OF_getprop(OF_finddevice("/"), "model", model, size) <= 0) { 79 return NULL; 80 } 81 82 /* should be plenty big enough, but never hurts... */ 83 model[size - 1] = '\0'; 84 const char *cmodel = model; 85 86 dce = device_compatible_lookup(&cmodel, 1, platform_data); 87 if (dce != NULL) { 88 return dce->data; 89 } 90 return NULL; 91 } 92 93 static u_int 94 mcclock_ofisa_read(struct mc146818_softc *sc, u_int reg) 95 { 96 bus_space_write_1(sc->sc_bst, sc->sc_bsh, 0, reg); 97 return bus_space_read_1(sc->sc_bst, sc->sc_bsh, 1); 98 } 99 100 static void 101 mcclock_ofisa_write(struct mc146818_softc *sc, u_int reg, u_int datum) 102 { 103 bus_space_write_1(sc->sc_bst, sc->sc_bsh, 0, reg); 104 bus_space_write_1(sc->sc_bst, sc->sc_bsh, 1, (uint8_t)datum); 105 } 106 107 static int 108 mcclock_ofisa_match(device_t parent, cfdata_t cf, void *aux) 109 { 110 struct ofisa_attach_args *aa = aux; 111 int rv; 112 113 rv = of_compatible_match(aa->oba.oba_phandle, compat_data) ? 5 : 0; 114 #ifdef _MCCLOCK_OFISA_MD_MATCH 115 if (!rv) 116 rv = mcclock_ofisa_md_match(parent, cf, aux); 117 #endif 118 return rv; 119 } 120 121 static void 122 mcclock_ofisa_attach(device_t parent, device_t self, void *aux) 123 { 124 struct mc146818_softc *sc = device_private(self); 125 struct ofisa_attach_args *aa = aux; 126 const struct mcclock_ofisa_platform_data *pd; 127 struct ofisa_reg_desc reg; 128 char model[64]; 129 int n; 130 131 sc->sc_dev = self; 132 133 n = ofisa_reg_get(aa->oba.oba_phandle, ®, 1); 134 #ifdef _MCCLOCK_OFISA_MD_REG_FIXUP 135 n = mcclock_ofisa_md_reg_fixup(parent, self, aux, ®, 1, n); 136 #endif 137 if (n != 1) { 138 aprint_error(": error getting register data\n"); 139 return; 140 } 141 if (reg.len != 2) { 142 aprint_error(": weird register size (%lu, expected 2)\n", 143 (unsigned long)reg.len); 144 return; 145 } 146 147 /* 148 * We don't configure interrupts here; we're only using this 149 * for the TODR. 150 */ 151 152 pd = lookup_platform_data(model, sizeof(model)); 153 154 sc->sc_bst = (reg.type == OFISA_REG_TYPE_IO) ? aa->iot : aa->memt; 155 if (bus_space_map(sc->sc_bst, reg.addr, reg.len, 0, &sc->sc_bsh) != 0) { 156 aprint_error(": can't map register space\n"); 157 return; 158 } 159 160 /* 161 * These default to 0. We'll warn after attaching if we didn't 162 * find any platform data. 163 */ 164 if (pd != NULL) { 165 sc->sc_year0 = pd->year0; 166 sc->sc_flag = pd->flags; 167 } 168 sc->sc_mcread = mcclock_ofisa_read; 169 sc->sc_mcwrite = mcclock_ofisa_write; 170 171 mc146818_attach(sc); 172 173 aprint_normal("\n"); 174 175 if (pd == NULL) { 176 /* 177 * We could dynamically compute at least BCD-ness and 178 * base year by comparing against the OFW get-time 179 * call, but it hardly seems worth it right now. 180 */ 181 aprint_error_dev(self, 182 "WARNING: no platform data for '%s', using defaults.\n", 183 model); 184 } 185 } 186 187 CFATTACH_DECL_NEW(mcclock_ofisa, sizeof(struct mc146818_softc), 188 mcclock_ofisa_match, mcclock_ofisa_attach, NULL, NULL); 189
Indexes created Mon Sep 29 15:09:53 GMT 2025