[MIPS] time: Set up Cobalt's mips_hpt_frequency
authorYoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Sun, 9 Dec 2007 12:22:04 +0000 (21:22 +0900)
committerRalf Baechle <ralf@linux-mips.org>
Fri, 14 Dec 2007 17:34:29 +0000 (17:34 +0000)
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
arch/mips/cobalt/time.c

index fa819fccd5dbd30ec497afb896c55eac9fb83bad..4a570e7145fe65fc0d551f60600feb916541bc3c 100644 (file)
 
 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);
 }