203 lines
6.2 KiB
C
203 lines
6.2 KiB
C
/* $NetBSD: rtc.c,v 1.8 2011/07/01 18:48:37 dyoung Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1994 Gordon W. Ross
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* Copyright (c) 1993 Adam Glass
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* Copyright (c) 1996 Paul Kranenburg
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* Copyright (c) 1996
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* The President and Fellows of Harvard College. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Harvard University.
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* This product includes software developed by Paul Kranenburg.
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* This product includes software developed by Harvard University.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)clock.c 8.1 (Berkeley) 6/11/93
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* from: NetBSD: clock.c,v 1.80 2006/09/03 22:27:45 gdamore Exp
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*
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rtc.c,v 1.8 2011/07/01 18:48:37 dyoung Exp $");
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/*
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* Clock driver for 'rtc' - mc146818 driver.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/proc.h>
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#include <sys/bus.h>
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#include <machine/autoconf.h>
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#include <dev/clock_subr.h>
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#include <dev/ic/mc146818reg.h>
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#include <dev/ic/mc146818var.h>
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#include <dev/ebus/ebusreg.h>
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#include <dev/ebus/ebusvar.h>
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static int rtc_ebus_match(device_t, cfdata_t, void *);
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static void rtc_ebus_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(rtc_ebus, sizeof(struct mc146818_softc),
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rtc_ebus_match, rtc_ebus_attach, NULL, NULL);
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u_int rtc_read_reg(struct mc146818_softc *, u_int);
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void rtc_write_reg(struct mc146818_softc *, u_int, u_int);
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u_int rtc_getcent(struct mc146818_softc *);
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void rtc_setcent(struct mc146818_softc *, u_int);
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static int
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rtc_ebus_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct ebus_attach_args *ea = aux;
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return (strcmp("rtc", ea->ea_name) == 0);
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}
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/*
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* `rtc' is a ds1287 on an ebus (actually an isa bus, but we use the
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* ebus driver for isa.) So we can use ebus_wenable() but need to do
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* different attach work and use different todr routines. It does not
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* incorporate an IDPROM.
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*/
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/*
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* XXX the stupid ds1287 is not mapped directly but uses an address
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* and a data reg so we cannot access the stuuupid thing w/o having
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* write access to the registers.
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*
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* XXXX We really need to mutex register access!
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*/
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#define RTC_ADDR 0
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#define RTC_DATA 1
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u_int
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rtc_read_reg(struct mc146818_softc *sc, u_int reg)
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{
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bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg);
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return (bus_space_read_1(sc->sc_bst, sc->sc_bsh, RTC_DATA));
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}
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void
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rtc_write_reg(struct mc146818_softc *sc, u_int reg, u_int val)
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{
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bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_ADDR, reg);
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bus_space_write_1(sc->sc_bst, sc->sc_bsh, RTC_DATA, val);
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}
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/* ARGSUSED */
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static void
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rtc_ebus_attach(device_t parent, device_t self, void *aux)
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{
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struct mc146818_softc *sc = device_private(self);
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struct ebus_attach_args *ea = aux;
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char *model;
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int sz;
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sc->sc_dev = self;
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sc->sc_bst = ea->ea_bustag;
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/* hard code to 8K? */
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sz = ea->ea_reg[0].size;
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if (bus_space_map(sc->sc_bst,
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EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
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sz, 0,
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&sc->sc_bsh) != 0) {
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aprint_error(": can't map register\n");
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return;
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}
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model = prom_getpropstring(ea->ea_node, "model");
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#ifdef DIAGNOSTIC
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if (model == NULL)
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panic("clockattach_rtc: no model property");
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#endif
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/* Our TOD clock year 0 is 0 */
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sc->sc_year0 = 0;
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sc->sc_flag = MC146818_NO_CENT_ADJUST;
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sc->sc_mcread = rtc_read_reg;
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sc->sc_mcwrite = rtc_write_reg;
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sc->sc_getcent = rtc_getcent;
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sc->sc_setcent = rtc_setcent;
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mc146818_attach(sc);
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aprint_normal(": %s\n", model);
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aprint_naive(": Clock\n");
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/*
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* Turn interrupts off, just in case. (Although they shouldn't
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* be wired to an interrupt controller on sparcs).
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*/
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rtc_write_reg(sc, MC_REGB, MC_REGB_BINARY | MC_REGB_24HR);
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/*
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* Apparently on some machines the TOD registers are on the same
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* physical page as the COM registers. So we won't protect them.
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*/
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/*sc->sc_handle.todr_setwen = NULL;*/
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}
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/*
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* MD mc146818 RTC todr routines.
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*/
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/* Loooks like Sun stores the century info somewhere in CMOS RAM */
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#define MC_CENT 0x32
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u_int
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rtc_getcent(struct mc146818_softc *sc)
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{
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return rtc_read_reg(sc, MC_CENT);
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}
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void
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rtc_setcent(struct mc146818_softc *sc, u_int cent)
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{
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rtc_write_reg(sc, MC_CENT, cent);
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}
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