/* $NetBSD: rtc.c,v 1.18 2011/07/18 00:31:13 mrg Exp $ */ /* * Copyright (c) 2001 Valeriy E. Ushakov * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* * `rtc' is a DS1287A (== MC146818A) time-of-day clock at EBus. * In Krups it's not used to store idprom so this driver doesn't * support it. Don't know about other ms-IIep systems. */ #include __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.18 2011/07/18 00:31:13 mrg Exp $"); #include #include #include #include #include #ifdef GPROF #include #endif #include #include #include #include #include #include struct rtc_ebus_softc { bus_space_tag_t sc_bt; /* parent bus tag */ bus_space_handle_t sc_bh; /* handle for registers */ }; static int rtcmatch_ebus(device_t, cfdata_t, void *); static void rtcattach_ebus(device_t, device_t, void *); CFATTACH_DECL_NEW(rtc_ebus, sizeof(struct rtc_ebus_softc), rtcmatch_ebus, rtcattach_ebus, NULL, NULL); /* XXX: global TOD clock handle (sparc/clock.c) */ extern todr_chip_handle_t todr_handle; /* todr(9) methods */ static int rtc_gettime(todr_chip_handle_t, struct timeval *); static int rtc_settime(todr_chip_handle_t, struct timeval *); int rtc_auto_century_adjust = 1; /* XXX: do we ever want not to? */ /* * MD read/write functions declared in mc146818reg.h */ #define RTC_ADDR 0 #define RTC_DATA 1 u_int mc146818_read(void *cookie, u_int reg) { struct rtc_ebus_softc *sc = cookie; bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); return (bus_space_read_1(sc->sc_bt, sc->sc_bh, RTC_DATA)); } void mc146818_write(void *cookie, u_int reg, u_int datum) { struct rtc_ebus_softc *sc = cookie; bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_ADDR, reg); bus_space_write_1(sc->sc_bt, sc->sc_bh, RTC_DATA, datum); } static int rtcmatch_ebus(device_t parent, cfdata_t cf, void *aux) { struct ebus_attach_args *ea = aux; return (strcmp(cf->cf_name, ea->ea_name) == 0); } static void rtcattach_ebus(device_t parent, device_t self, void *aux) { struct rtc_ebus_softc *sc = device_private(self); struct ebus_attach_args *ea = aux; todr_chip_handle_t handle; sc->sc_bt = ea->ea_bustag; if (bus_space_map(sc->sc_bt, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), ea->ea_reg[0].size, 0, &sc->sc_bh) != 0) { printf(": unable to map registers\n"); return; } /* XXX: no "model" property in Krups */ printf(": time-of-day clock\n"); /* * Turn interrupts off (clear MC_REGB_?IE bits), just in case * (although they shouldn't be wired to an interrupt * controller on sparcs). */ mc146818_write(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); /* setup our todr_handle */ handle = malloc(ALIGN(sizeof(struct todr_chip_handle)), M_DEVBUF, M_NOWAIT); handle->cookie = sc; handle->bus_cookie = NULL; /* unused */ handle->todr_gettime = rtc_gettime; handle->todr_settime = rtc_settime; handle->todr_setwen = NULL; /* not necessary, no idprom to protect */ todr_attach(handle); } /* * Get time-of-day and convert to a `struct timeval' * Return 0 on success; an error number otherwise. */ static int rtc_gettime(todr_chip_handle_t handle, struct timeval *tv) { struct rtc_ebus_softc *sc = handle->cookie; struct clock_ymdhms dt; u_int year; /* update in progress; spin loop */ while (mc146818_read(sc, MC_REGA) & MC_REGA_UIP) continue; /* stop updates (XXX: do we need that???) */ mc146818_write(sc, MC_REGB, (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); /* read time */ dt.dt_sec = mc146818_read(sc, MC_SEC); dt.dt_min = mc146818_read(sc, MC_MIN); dt.dt_hour = mc146818_read(sc, MC_HOUR); dt.dt_day = mc146818_read(sc, MC_DOM); dt.dt_mon = mc146818_read(sc, MC_MONTH); year = mc146818_read(sc, MC_YEAR); /* reenable updates */ mc146818_write(sc, MC_REGB, (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); /* year in the century 0..99: adjust to AD */ year += 1900; if (year < POSIX_BASE_YEAR && rtc_auto_century_adjust != 0) year += 100; dt.dt_year = year; /* simple sanity checks */ if (dt.dt_mon > 12 || dt.dt_day > 31 || dt.dt_hour >= 24 || dt.dt_min >= 60 || dt.dt_sec >= 60) return (ERANGE); tv->tv_sec = clock_ymdhms_to_secs(&dt); tv->tv_usec = 0; return (0); } /* * Set the time-of-day clock based on the value of the `struct timeval' arg. * Return 0 on success; an error number otherwise. */ static int rtc_settime(todr_chip_handle_t handle, struct timeval *tv) { struct rtc_ebus_softc *sc = handle->cookie; struct clock_ymdhms dt; u_int year; clock_secs_to_ymdhms(tv->tv_sec, &dt); year = dt.dt_year - 1900; if (year >= 100 && rtc_auto_century_adjust != 0) year -= 100; /* stop updates */ mc146818_write(sc, MC_REGB, (mc146818_read(sc, MC_REGB) | MC_REGB_SET)); mc146818_write(sc, MC_SEC, dt.dt_sec); mc146818_write(sc, MC_MIN, dt.dt_min); mc146818_write(sc, MC_HOUR, dt.dt_hour); mc146818_write(sc, MC_DOW, dt.dt_wday + 1); mc146818_write(sc, MC_DOM, dt.dt_day); mc146818_write(sc, MC_MONTH, dt.dt_mon); mc146818_write(sc, MC_YEAR, year); /* reenable updates */ mc146818_write(sc, MC_REGB, (mc146818_read(sc, MC_REGB) & ~MC_REGB_SET)); return (0); }