1 /* $NetBSD: rtc.c,v 1.9 2023/06/27 19:30:27 andvar Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * Copyright (c) 1994 Gordon W. Ross 7 * Copyright (c) 1993 Adam Glass 8 * Copyright (c) 1996 Paul Kranenburg 9 * Copyright (c) 1996 10 * The President and Fellows of Harvard College. All rights reserved. 11 * 12 * This software was developed by the Computer Systems Engineering group 13 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 14 * contributed to Berkeley. 15 * 16 * All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Harvard University. 19 * This product includes software developed by the University of 20 * California, Lawrence Berkeley Laboratory. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 26 * 1. Redistributions of source code must retain the above copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * This product includes software developed by the University of 34 * California, Berkeley and its contributors. 35 * This product includes software developed by Paul Kranenburg. 36 * This product includes software developed by Harvard University. 37 * 4. Neither the name of the University nor the names of its contributors 38 * may be used to endorse or promote products derived from this software 39 * without specific prior written permission. 40 * 41 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * @(#)clock.c 8.1 (Berkeley) 6/11/93 54 * from: NetBSD: clock.c,v 1.80 2006/09/03 22:27:45 gdamore Exp 55 * 56 */ 57 58 #include <sys/cdefs.h> 59 __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.9 2023/06/27 19:30:27 andvar Exp $"); 60 61 /* 62 * Clock driver for 'rtc' - mc146818 driver. 63 */ 64 65 #include <sys/param.h> 66 #include <sys/kernel.h> 67 #include <sys/device.h> 68 #include <sys/proc.h> 69 70 #include <sys/bus.h> 71 #include <machine/autoconf.h> 72 73 #include <dev/clock_subr.h> 74 #include <dev/ic/mc146818reg.h> 75 #include <dev/ic/mc146818var.h> 76 77 #include <dev/ebus/ebusreg.h> 78 #include <dev/ebus/ebusvar.h> 79 80 static int rtc_ebus_match(device_t, cfdata_t, void *); 81 static void rtc_ebus_attach(device_t, device_t, void *); 82 83 CFATTACH_DECL_NEW(rtc_ebus, sizeof(struct mc146818_softc), 84 rtc_ebus_match, rtc_ebus_attach, NULL, NULL); 85 86 u_int rtc_read_reg(struct mc146818_softc *, u_int); 87 void rtc_write_reg(struct mc146818_softc *, u_int, u_int); 88 u_int rtc_getcent(struct mc146818_softc *); 89 void rtc_setcent(struct mc146818_softc *, u_int); 90 91 static int 92 rtc_ebus_match(device_t parent, cfdata_t cf, void *aux) 93 { 94 struct ebus_attach_args *ea = aux; 95 96 return (strcmp("rtc", ea->ea_name) == 0); 97 } 98 99 /* 100 * `rtc' is a ds1287 on an ebus (actually an isa bus, but we use the 101 * ebus driver for isa.) So we can use ebus_wenable() but need to do 102 * different attach work and use different todr routines. It does not 103 * incorporate an IDPROM. 104 */ 105 106 /* 107 * XXX the stupid ds1287 is not mapped directly but uses an address 108 * and a data reg so we cannot access the stuuupid thing w/o having 109 * write access to the registers. 110 * 111 * XXXX We really need to mutex register access! 112 */ 113 #define RTC_ADDR 0 114 #define RTC_DATA 1 115 u_int 116 rtc_read_reg(struct mc146818_softc *sc, u_int reg) 117 { 118 119 bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg); 120 return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, RTC_DATA)); 121 } 122 void 123 rtc_write_reg(struct mc146818_softc *sc, u_int reg, u_int val) 124 { 125 126 bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg); 127 bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_DATA, val); 128 } 129 130 /* ARGSUSED */ 131 static void 132 rtc_ebus_attach(device_t parent, device_t self, void *aux) 133 { 134 struct mc146818_softc *sc = device_private(self); 135 struct ebus_attach_args *ea = aux; 136 char *model; 137 int sz; 138 139 sc->sc_dev = self; 140 sc->sc_bst = ea->ea_bustag; 141 142 /* hard code to 8K? */ 143 sz = ea->ea_reg[0].size; 144 145 if (bus_space_map(sc->sc_bst, 146 EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), 147 sz, 0, 148 &sc->sc_bsh) != 0) { 149 aprint_error(": can't map register\n"); 150 return; 151 } 152 153 model = prom_getpropstring(ea->ea_node, "model"); 154 #ifdef DIAGNOSTIC 155 if (model == NULL) 156 panic("clockattach_rtc: no model property"); 157 #endif 158 159 /* Our TOD clock year 0 is 0 */ 160 sc->sc_year0 = 0; 161 sc->sc_flag = MC146818_NO_CENT_ADJUST; 162 sc->sc_mcread = rtc_read_reg; 163 sc->sc_mcwrite = rtc_write_reg; 164 sc->sc_getcent = rtc_getcent; 165 sc->sc_setcent = rtc_setcent; 166 mc146818_attach(sc); 167 168 aprint_normal(": %s\n", model); 169 aprint_naive(": Clock\n"); 170 171 /* 172 * Turn interrupts off, just in case. (Although they shouldn't 173 * be wired to an interrupt controller on sparcs). 174 */ 175 rtc_write_reg(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); 176 177 /* 178 * Apparently on some machines the TOD registers are on the same 179 * physical page as the COM registers. So we won't protect them. 180 */ 181 /*sc->sc_handle.todr_setwen = NULL;*/ 182 } 183 184 /* 185 * MD mc146818 RTC todr routines. 186 */ 187 188 /* Looks like Sun stores the century info somewhere in CMOS RAM */ 189 #define MC_CENT 0x32 190 191 u_int 192 rtc_getcent(struct mc146818_softc *sc) 193 { 194 195 return rtc_read_reg(sc, MC_CENT); 196 } 197 void 198 rtc_setcent(struct mc146818_softc *sc, u_int cent) 199 { 200 201 rtc_write_reg(sc, MC_CENT, cent); 202 } 203
Indexes created Sat Sep 20 22:09:52 GMT 2025