/* $NetBSD: rtc.c,v 1.9 2023/06/27 19:30:27 andvar Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 1994 Gordon W. Ross * Copyright (c) 1993 Adam Glass * Copyright (c) 1996 Paul Kranenburg * Copyright (c) 1996 * The President and Fellows of Harvard College. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by Harvard University. * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * This product includes software developed by Paul Kranenburg. * This product includes software developed by Harvard University. * 4. 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. * * @(#)clock.c 8.1 (Berkeley) 6/11/93 * from: NetBSD: clock.c,v 1.80 2006/09/03 22:27:45 gdamore Exp * */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.9 2023/06/27 19:30:27 andvar Exp $"); /* * Clock driver for 'rtc' - mc146818 driver. */ #include <sys/param.h> #include <sys/kernel.h> #include <sys/device.h> #include <sys/proc.h> #include <sys/bus.h> #include <machine/autoconf.h> #include <dev/clock_subr.h> #include <dev/ic/mc146818reg.h> #include <dev/ic/mc146818var.h> #include <dev/ebus/ebusreg.h> #include <dev/ebus/ebusvar.h> static int rtc_ebus_match(device_t, cfdata_t, void *); static void rtc_ebus_attach(device_t, device_t, void *); CFATTACH_DECL_NEW(rtc_ebus, sizeof(struct mc146818_softc), rtc_ebus_match, rtc_ebus_attach, NULL, NULL); u_int rtc_read_reg(struct mc146818_softc *, u_int); void rtc_write_reg(struct mc146818_softc *, u_int, u_int); u_int rtc_getcent(struct mc146818_softc *); void rtc_setcent(struct mc146818_softc *, u_int); static int rtc_ebus_match(device_t parent, cfdata_t cf, void *aux) { struct ebus_attach_args *ea = aux; return (strcmp("rtc", ea->ea_name) == 0); } /* * `rtc' is a ds1287 on an ebus (actually an isa bus, but we use the * ebus driver for isa.) So we can use ebus_wenable() but need to do * different attach work and use different todr routines. It does not * incorporate an IDPROM. */ /* * XXX the stupid ds1287 is not mapped directly but uses an address * and a data reg so we cannot access the stuuupid thing w/o having * write access to the registers. * * XXXX We really need to mutex register access! */ #define RTC_ADDR 0 #define RTC_DATA 1 u_int rtc_read_reg(struct mc146818_softc *sc, u_int reg) { bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg); return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, RTC_DATA)); } void rtc_write_reg(struct mc146818_softc *sc, u_int reg, u_int val) { bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg); bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_DATA, val); } /* ARGSUSED */ static void rtc_ebus_attach(device_t parent, device_t self, void *aux) { struct mc146818_softc *sc = device_private(self); struct ebus_attach_args *ea = aux; char *model; int sz; sc->sc_dev = self; sc->sc_bst = ea->ea_bustag; /* hard code to 8K? */ sz = ea->ea_reg[0].size; if (bus_space_map(sc->sc_bst, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]), sz, 0, &sc->sc_bsh) != 0) { aprint_error(": can't map register\n"); return; } model = prom_getpropstring(ea->ea_node, "model"); #ifdef DIAGNOSTIC if (model == NULL) panic("clockattach_rtc: no model property"); #endif /* Our TOD clock year 0 is 0 */ sc->sc_year0 = 0; sc->sc_flag = MC146818_NO_CENT_ADJUST; sc->sc_mcread = rtc_read_reg; sc->sc_mcwrite = rtc_write_reg; sc->sc_getcent = rtc_getcent; sc->sc_setcent = rtc_setcent; mc146818_attach(sc); aprint_normal(": %s\n", model); aprint_naive(": Clock\n"); /* * Turn interrupts off, just in case. (Although they shouldn't * be wired to an interrupt controller on sparcs). */ rtc_write_reg(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR); /* * Apparently on some machines the TOD registers are on the same * physical page as the COM registers. So we won't protect them. */ /*sc->sc_handle.todr_setwen = NULL;*/ } /* * MD mc146818 RTC todr routines. */ /* Looks like Sun stores the century info somewhere in CMOS RAM */ #define MC_CENT 0x32 u_int rtc_getcent(struct mc146818_softc *sc) { return rtc_read_reg(sc, MC_CENT); } void rtc_setcent(struct mc146818_softc *sc, u_int cent) { rtc_write_reg(sc, MC_CENT, cent); }
