[PATCH] Cyclone timer fixes

Patch from: john stultz <johnstul@us.ibm.com>

        This patch "fixes" the timer_cyclone code by having it
initialize fast_gettimeoffset_quotient and cpu_khz in the same manner as
timer_tsc. This is required for enabling the timer_cyclone code on the
x440.

Ideally fast_gettimeoffset_quotient would not be used outside timer_tsc
and cpu_khz would be initialized generically outside the timer
subsystem. I have patches to do this, but they touch quite a bit of
generic code, and I'd rather not make the timer_cyclone enablement
(patch to follow) depend on these larger changes.

arch/i386/kernel/timers/timer_cyclone.c

@@ -17,6 +17,7 @@
 #include <asm/fixmap.h>
 
 extern spinlock_t i8253_lock;
+extern unsigned long calibrate_tsc(void);
 
 /* Number of usecs that the last interrupt was delayed */
 static int delay_at_last_interrupt;
@@ -145,6 +146,27 @@ static int init_cyclone(void)
 		}
 	}
 
+	/* init cpu_khz.
+	 * XXX - This should really be done elsewhere, 
+	 * 		and in a more generic fashion. -johnstul@us.ibm.com
+	 */
+	if (cpu_has_tsc) {
+		unsigned long tsc_quotient = calibrate_tsc();
+		if (tsc_quotient) {
+			/* report CPU clock rate in Hz.
+			 * The formula is (10^6 * 2^32) / (2^32 * 1 / (clocks/us)) =
+			 * clock/second. Our precision is about 100 ppm.
+			 */
+			{	unsigned long eax=0, edx=1000;
+				__asm__("divl %2"
+		       		:"=a" (cpu_khz), "=d" (edx)
+        	       		:"r" (tsc_quotient),
+	                	"0" (eax), "1" (edx));
+				printk("Detected %lu.%03lu MHz processor.\n", cpu_khz / 1000, cpu_khz % 1000);
+			}
+		}
+	}
+
 	/* Everything looks good! */
 	return 0;
 }

arch/i386/kernel/timers/timer_tsc.c

@@ -130,7 +130,7 @@ static void delay_tsc(unsigned long loops)
 #define CALIBRATE_LATCH	(5 * LATCH)
 #define CALIBRATE_TIME	(5 * 1000020/HZ)
 
-static unsigned long __init calibrate_tsc(void)
+unsigned long __init calibrate_tsc(void)
 {
        /* Set the Gate high, disable speaker */
 	outb((inb(0x61) & ~0x02) | 0x01, 0x61);