/* $NetBSD: rtc.c,v 1.21.58.1 2024/06/22 10:57:10 martin Exp $ */ /* * Copyright (c) 1988 University of Utah. * Copyright (c) 1982, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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. * * from: Utah $Hdr: clock.c 1.18 91/01/21$ * * @(#)clock.c 8.2 (Berkeley) 1/12/94 */ /* * attachment for HP300 real-time clock (RTC) */ #include __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.21.58.1 2024/06/22 10:57:10 martin Exp $"); #include #include #include #include #include #include #include struct rtc_softc { device_t sc_dev; bus_space_tag_t sc_bst; bus_space_handle_t sc_bsh; struct todr_chip_handle sc_handle; }; static int rtcmatch(device_t, cfdata_t, void *); static void rtcattach(device_t, device_t, void *aux); CFATTACH_DECL_NEW(rtc, sizeof(struct rtc_softc), rtcmatch, rtcattach, NULL, NULL); static int rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); static int rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); static uint8_t rtc_readreg(struct rtc_softc *, int); static uint8_t rtc_writereg(struct rtc_softc *, int, uint8_t); static int rtcmatch(device_t parent, cfdata_t cf, void *aux) { struct intio_attach_args *ia = aux; /* 425e doesn't have the traditional RTC at intio */ if (machineid == HP_425 && mmuid == MMUID_425_E) return 0; if (strcmp("rtc", ia->ia_modname) != 0) return 0; return 1; } static void rtcattach(device_t parent, device_t self, void *aux) { struct rtc_softc *sc = device_private(self); struct intio_attach_args *ia = aux; struct todr_chip_handle *todr_handle; bus_space_tag_t bst = ia->ia_bst; sc->sc_dev = self; if (bus_space_map(bst, ia->ia_iobase, INTIO_DEVSIZE, 0, &sc->sc_bsh)) { aprint_error(": can't map registers\n"); return; } aprint_normal("\n"); sc->sc_bst = bst; todr_handle = &sc->sc_handle; todr_handle->cookie = sc; todr_handle->todr_gettime = NULL; todr_handle->todr_settime = NULL; todr_handle->todr_gettime_ymdhms = rtc_gettime_ymdhms; todr_handle->todr_settime_ymdhms = rtc_settime_ymdhms; todr_handle->todr_setwen = NULL; todr_attach(todr_handle); } static int rtc_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) { struct rtc_softc *sc; int i, year; bool read_okay; uint8_t rtc_registers[NUM_RTC_REGS]; sc = handle->cookie; /* read rtc registers */ read_okay = false; while (!read_okay) { read_okay = true; for (i = 0; i < NUM_RTC_REGS; i++) rtc_registers[i] = rtc_readreg(sc, i); for (i = 0; i < NUM_RTC_REGS; i++) if (rtc_registers[i] != rtc_readreg(sc, i)) read_okay = false; } #define rtc_to_decimal(a,b) (rtc_registers[a] * 10 + rtc_registers[b]) dt->dt_sec = rtc_to_decimal(1, 0); dt->dt_min = rtc_to_decimal(3, 2); dt->dt_hour = (rtc_registers[5] & RTC_REG5_HOUR) * 10 + rtc_registers[4]; dt->dt_day = rtc_to_decimal(8, 7); dt->dt_mon = rtc_to_decimal(10, 9); year = rtc_to_decimal(12, 11) + RTC_BASE_YEAR; if (year < POSIX_BASE_YEAR) year += 100; dt->dt_year = year; #undef rtc_to_decimal return 0; } static int rtc_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt) { struct rtc_softc *sc; int i, year; uint8_t rtc_registers[NUM_RTC_REGS]; sc = handle->cookie; year = dt->dt_year - RTC_BASE_YEAR; if (year > 99) year -= 100; #define decimal_to_rtc(a,b,n) \ rtc_registers[a] = (n) % 10; \ rtc_registers[b] = (n) / 10; decimal_to_rtc(0, 1, dt->dt_sec); decimal_to_rtc(2, 3, dt->dt_min); decimal_to_rtc(7, 8, dt->dt_day); decimal_to_rtc(9, 10, dt->dt_mon); decimal_to_rtc(11, 12, year); rtc_registers[4] = dt->dt_hour % 10; rtc_registers[5] = ((dt->dt_hour / 10) & RTC_REG5_HOUR) | RTC_REG5_24HR; rtc_registers[6] = 0; #undef decimal_to_rtc /* write rtc registers */ rtc_writereg(sc, 15, 13); /* reset prescalar */ for (i = 0; i < NUM_RTC_REGS; i++) if (rtc_registers[i] != rtc_writereg(sc, i, rtc_registers[i])) return 1; return 0; } static uint8_t rtc_readreg(struct rtc_softc *sc, int reg) { bus_space_tag_t bst = sc->sc_bst; bus_space_handle_t bsh = sc->sc_bsh; uint8_t data; int s = splvm(); data = reg; intio_device_writecmd(bst, bsh, RTC_SET_REG, &data, 1); intio_device_readcmd(bst, bsh, RTC_READ_REG, &data); splx(s); return data; } static uint8_t rtc_writereg(struct rtc_softc *sc, int reg, uint8_t data) { bus_space_tag_t bst = sc->sc_bst; bus_space_handle_t bsh = sc->sc_bsh; uint8_t tmp; int s = splvm(); tmp = (data << 4) | reg; intio_device_writecmd(bst, bsh, RTC_SET_REG, &tmp, 1); intio_device_writecmd(bst, bsh, RTC_WRITE_REG, NULL, 0); intio_device_readcmd(bst, bsh, RTC_READ_REG, &tmp); splx(s); return tmp; }