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authorYoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>2007-12-09 21:22:04 +0900
committerRalf Baechle <ralf@linux-mips.org>2007-12-14 17:34:29 +0000
commit18ca38d26f65c849af109eb911295c7dde71ce3b (patch)
tree7d743a2827c8facd4b69e55f4add2443fc0534a5
parentda8cadb31b82c9d41fc593c8deab6aa20b162d6b (diff)
[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>
-rw-r--r--arch/mips/cobalt/time.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/arch/mips/cobalt/time.c b/arch/mips/cobalt/time.c
index fa819fccd5d..4a570e7145f 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);
}