Add a front-end for the `rtc' device which is a MC146818 compatible

clock found on the ISA bus (some USIIe, USIIi and USIIIi models) and
EBus (USIII models) instead of a MK48Txx clock.

Testet by:	Matthew T. Lager" <freebsd@trinetworks.com> on Sun Fire V100,
		Xavier Beaudouin <kiwi@oav.net> on Netra X1 (initial version)

sys/conf/files.sparc64

@@ -103,6 +103,8 @@ sparc64/sparc64/ofw_bus.c	standard
 sparc64/sparc64/ofw_machdep.c	standard
 sparc64/sparc64/pmap.c		standard
 sparc64/sparc64/prof_machdep.c	optional	profiling-routine
+sparc64/sparc64/rtc.c		optional	rtc ebus
+sparc64/sparc64/rtc.c		optional	rtc isa
 sparc64/sparc64/rwindow.c	standard
 sparc64/sparc64/sc_machdep.c	optional	sc
 sparc64/sparc64/spitfire.c	standard

sys/sparc64/conf/GENERIC

@@ -128,6 +128,8 @@ device		auxio		# auxiliary I/O device
 device		genclock	# Generic clock interface
 device		eeprom		# eeprom (really a front-end for the MK48Txx)
 device		mk48txx		# Mostek MK48Txx clocks
+device		rtc		# rtc (really a front-end for the MC146818)
+device		mc146818	# Motorola MC146818 and compatible clocks
 
 # Serial (COM) ports
 device		sab		# Siemens SAB82532 based serial ports

sys/sparc64/conf/NOTES

@@ -42,6 +42,8 @@ device		fhc
 device		genclock	# Generic clock interface
 device		eeprom		# eeprom (really a front-end for the MK48Txx)
 device		mk48txx		# Mostek MK48Txx clocks
+device		rtc		# rtc (really a front-end for the MC146818)
+device		mc146818	# Motorola MC146818 and compatible clocks
 
 #
 # Optional devices:

sys/sparc64/sparc64/rtc.c

@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2004 Marius Strobl <marius@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * The `rtc' device is a MC146818 compatible clock found on the ISA bus
+ * and EBus. The EBus version also has an interrupt property so it could
+ * be used to drive the statclock etc.
+ */
+
+#include "opt_isa.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/resource.h>
+
+#include <dev/ofw/ofw_bus.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <sys/rman.h>
+
+#include <isa/isavar.h>
+
+#include <dev/mc146818/mc146818var.h>
+
+#include "clock_if.h"
+
+static devclass_t rtc_devclass;
+
+static int	rtc_attach(device_t dev);
+static int	rtc_ebus_probe(device_t dev);
+#ifdef DEV_ISA
+static int	rtc_isa_probe(device_t dev);
+#endif
+
+static device_method_t rtc_ebus_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		rtc_ebus_probe),
+	DEVMETHOD(device_attach,	rtc_attach),
+
+	/* clock interface */
+	DEVMETHOD(clock_gettime,	mc146818_gettime),
+	DEVMETHOD(clock_settime,	mc146818_settime),
+#ifdef notyet
+	DEVMETHOD(clock_getsecs,	mc146818_getsecs),
+#endif
+
+	{ 0, 0 }
+};
+
+static driver_t rtc_ebus_driver = {
+	"rtc",
+	rtc_ebus_methods,
+	sizeof(struct mc146818_softc),
+};
+
+DRIVER_MODULE(rtc, ebus, rtc_ebus_driver, rtc_devclass, 0, 0);
+
+#ifdef DEV_ISA
+static device_method_t rtc_isa_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		rtc_isa_probe),
+	DEVMETHOD(device_attach,	rtc_attach),
+
+	/* clock interface */
+	DEVMETHOD(clock_gettime,	mc146818_gettime),
+	DEVMETHOD(clock_settime,	mc146818_settime),
+#ifdef notyet
+	DEVMETHOD(clock_getsecs,	mc146818_getsecs),
+#endif
+
+	{ 0, 0 }
+};
+
+static driver_t rtc_isa_driver = {
+	"rtc",
+	rtc_isa_methods,
+	sizeof(struct mc146818_softc),
+};
+
+DRIVER_MODULE(rtc, isa, rtc_isa_driver, rtc_devclass, 0, 0);
+#endif
+
+static int
+rtc_ebus_probe(device_t dev)
+{
+ 
+	if (strcmp(ofw_bus_get_name(dev), "rtc") == 0) {
+		device_set_desc(dev, "Real Time Clock");
+		return (0);
+	}
+
+	return (ENXIO);
+}
+
+#ifdef DEV_ISA
+static struct isa_pnp_id rtc_isa_ids[] = {
+	{ 0x000bd041, "AT realtime clock" }, /* PNP0B00 */
+	{ 0 }
+};
+
+static int
+rtc_isa_probe(device_t dev)
+{
+
+	if (ISA_PNP_PROBE(device_get_parent(dev), dev, rtc_isa_ids) == 0) {
+		device_set_desc(dev, "Real Time Clock");
+		return (0);
+	}
+
+	return (ENXIO);
+}
+#endif
+
+static int
+rtc_attach(device_t dev)
+{
+	struct timespec ts;
+	struct mc146818_softc *sc;
+	struct resource *res;
+	int error, rid;
+
+	sc = device_get_softc(dev);
+	bzero(sc, sizeof(struct mc146818_softc));
+
+	rid = 0;
+	res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, RF_ACTIVE);
+	if (res == NULL) {
+		device_printf(dev, "could not allocate resources\n");
+		return (ENXIO);
+	}
+	sc->sc_bst = rman_get_bustag(res);
+	sc->sc_bsh = rman_get_bushandle(res);
+
+	/* The TOD clock year 0 is 0. */
+	sc->sc_year0 = 0;
+	/* Use default register read/write and century get/set functions. */
+	sc->sc_flag = MC146818_NO_CENT_ADJUST;
+	if ((error = mc146818_attach(dev)) != 0) {
+		device_printf(dev, "cannot attach time of day clock\n");
+		return (error);
+	}
+
+	if (bootverbose) {
+		mc146818_gettime(dev, &ts);
+		device_printf(dev, "current time: %ld.%09ld\n", (long)ts.tv_sec,
+		    ts.tv_nsec);
+        }
+
+	return (0);
+}