[MIPS] time: Set up Cobalt's mips_hpt_frequency

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 20 insertions, 1 deletions

diff --git a/arch/mips/cobalt/time.c b/arch/mips/cobalt/time.c
index fa819fccd5db..4a570e7145fe 100644
--- a/arch/mips/cobalt/time.c
+++ b/arch/mips/cobalt/time.c
@@ -27,9 +27,28 @@
 
 void __init plat_time_init(void)
 {
+	u32 start, end;
+	int i = HZ / 10;
+
 	setup_pit_timer();
 
 	gt641xx_set_base_clock(GT641XX_BASE_CLOCK);
 
-	mips_timer_state = gt641xx_timer0_state;
+	/*
+	 * 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);
 }