Initial import

1 files changed, 54 insertions, 0 deletions

diff --git a/arch/mips/cobalt/time.c b/arch/mips/cobalt/time.c
new file mode 100644
index 000000000..3bff3b820
--- /dev/null
+++ b/arch/mips/cobalt/time.c
@@ -0,0 +1,54 @@
+/*
+ *  Cobalt time initialization.
+ *
+ *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/i8253.h>
+#include <linux/init.h>
+
+#include <asm/gt64120.h>
+#include <asm/time.h>
+
+#define GT641XX_BASE_CLOCK	50000000	/* 50MHz */
+
+void __init plat_time_init(void)
+{
+	u32 start, end;
+	int i = HZ / 10;
+
+	setup_pit_timer();
+
+	gt641xx_set_base_clock(GT641XX_BASE_CLOCK);
+
+	/*
+	 * MIPS counter frequency is measured during a 100msec interval
+	 * using GT64111 timer0.
+	 */
+	while (!gt641xx_timer0_state())
+		;
+
+	start = read_c0_count();
+
+	while (i--)
+		while (!gt641xx_timer0_state())
+			;
+
+	end = read_c0_count();
+
+	mips_hpt_frequency = (end - start) * 10;
+	printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency);
+}