Initial Spring 2016 commit.

kern/dev/lamebus/rtclock_ltimer.c

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
+ *	The President and Fellows of Harvard College.
+ *
+ * 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 UNIVERSITY 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 UNIVERSITY 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.
+ */
+
+/*
+ * Code for attaching the (generic) rtclock device to the LAMEbus ltimer.
+ *
+ * rtclock is a generic clock interface that gets its clock service from
+ * an actual hardware clock of some kind. (Theoretically it could also
+ * get its clock service from a clock maintained in software, as is the
+ * case on most systems. However, no such driver has been written yet.)
+ *
+ * ltimer can provide this clock service.
+ */
+
+#include <types.h>
+#include <lib.h>
+#include <generic/rtclock.h>
+#include <lamebus/ltimer.h>
+#include "autoconf.h"
+
+struct rtclock_softc *
+attach_rtclock_to_ltimer(int rtclockno, struct ltimer_softc *ls)
+{
+	/*
+	 * No need to probe; ltimer always has a clock.
+	 * Just allocate the rtclock, set our fields, and return it.
+	 */
+	struct rtclock_softc *rtc = kmalloc(sizeof(struct rtclock_softc));
+	if (rtc==NULL) {
+		/* Out of memory */
+		return NULL;
+	}
+
+	(void)rtclockno;  // unused
+
+	rtc->rtc_devdata = ls;
+	rtc->rtc_gettime = ltimer_gettime;
+
+	return rtc;
+}