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-rw-r--r--arch/mips/cobalt/time.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/mips/cobalt/time.c b/arch/mips/cobalt/time.c
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+++ b/arch/mips/cobalt/time.c
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+/*
+ * 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);
+}