1 files changed, 113 insertions, 0 deletions
diff --git a/sys/mips/rmi/tick.c b/sys/mips/rmi/tick.c
new file mode 100644
index 0000000..aaeb0e9
--- /dev/null
+++ b/sys/mips/rmi/tick.c
@@ -0,0 +1,113 @@
+/*-
+ * Copyright (c) 2006-2009 RMI Corporation
+ * Copyright (c) 2006 Bruce M. Simpson
+ * 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.
+ */
+
+/*
+ * Simple driver for the 32-bit interval counter built in to all
+ * MIPS32 CPUs.
+ * XXX: For calibration this either needs an external clock, or
+ * to be explicitly told what the frequency is.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <sys/timetc.h>
+#include <sys/kernel.h>
+#include <sys/power.h>
+#include <sys/smp.h>
+#include <machine/clock.h>
+#include <machine/locore.h>
+#include <machine/md_var.h>
+#include <machine/hwfunc.h>
+
+
+struct timecounter counter_timecounter = {
+	platform_get_timecount,	/* get_timecount */
+	0,			/* no poll_pps */
+	~0u,			/* counter_mask */
+	0,			/* frequency */
+	"MIPS32",		/* name */
+	800,			/* quality (adjusted in code) */
+};
+
+void tick_init(void);
+
+
+void
+tick_init(void)
+{
+	counter_freq = platform_get_frequency();
+	if (bootverbose)
+		printf("MIPS32 clock: %u MHz", cpu_clock);
+
+	counter_timecounter.tc_frequency = counter_freq;
+	tc_init(&counter_timecounter);
+}
+
+
+void
+cpu_startprofclock(void)
+{
+	/* nothing to do */
+}
+
+void
+cpu_stopprofclock(void)
+{
+	/* nothing to do */
+}
+
+
+static int
+sysctl_machdep_counter_freq(SYSCTL_HANDLER_ARGS)
+{
+	int error;
+	uint64_t freq;
+
+	/*
+	 * RRS wonders if this will really work. You don't change the req of
+	 * the system here, it would require changes to the RMI PIC in order
+	 * to get the TC to run at a differrent frequency.
+	 */
+
+	if (counter_timecounter.tc_frequency == 0)
+		return (EOPNOTSUPP);
+	freq = counter_freq;
+	error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
+	if (error == 0 && req->newptr != NULL) {
+		counter_freq = freq;
+		counter_timecounter.tc_frequency = counter_freq;
+	}
+	return (error);
+}
+
+SYSCTL_PROC(_machdep, OID_AUTO, counter_freq, CTLTYPE_QUAD | CTLFLAG_RW,
+    0, sizeof(u_int), sysctl_machdep_counter_freq, "IU", "");