Add a driver back end for MC146818 and compatible clocks based on the

respective NetBSD driver for use with the genclock interface.
It's first use will be on sparc64 but it was also tested on alpha with
a preliminary patch to switch alpha to use the genclock code together
with this driver instead of the respective code in alpha/alpha/clock.c
and the rather MD mcclock(4). Using it on i386 and amd64 won't be that
hard but some changes/extensions to improve the genclock code in general
should be done first, e.g. add locking and make it easier to access the
NVRAM usually coupled with RTCs.

1 files changed, 60 insertions, 0 deletions

diff --git a/sys/dev/mc146818/mc146818var.h b/sys/dev/mc146818/mc146818var.h
new file mode 100644
index 0000000..78d9945
--- /dev/null
+++ b/sys/dev/mc146818/mc146818var.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2003 Izumi Tsutsui.  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.
+ *
+ *	from: NetBSD: mc146818var.h,v 1.3 2003/11/24 06:20:40 tsutsui Exp
+ *
+ * $FreeBSD$
+ */
+
+struct mc146818_softc {
+	bus_space_tag_t	sc_bst;			/* bus space tag */
+	bus_space_handle_t sc_bsh;		/* bus space handle */
+
+	u_char sc_rega;				/* register A */
+	u_char sc_regb;				/* register B */
+
+	u_int sc_year0;				/* year counter offset */
+	u_int sc_flag;				/* MD flags */
+#define MC146818_NO_CENT_ADJUST	0x0001		/* don't adjust century */
+#define MC146818_BCD		0x0002		/* use BCD mode */
+#define MC146818_12HR		0x0004		/* use AM/PM mode */
+
+	/* MD chip register read/write functions */
+	u_int (*sc_mcread)(device_t, u_int);
+	void (*sc_mcwrite)(device_t, u_int, u_int);
+	/* MD century get/set functions */
+	u_int (*sc_getcent)(device_t);
+	void (*sc_setcent)(device_t, u_int);
+};
+
+/* Chip attach function */
+int mc146818_attach(device_t);
+
+/* Methods for the clock interface */
+#ifdef notyet
+int mc146818_getsecs(device_t, int *);
+#endif
+int mc146818_gettime(device_t, struct timespec *);
+int mc146818_settime(device_t, struct timespec *);