for S2735 support

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1708 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/cpu/intel/model_f2x/Config.lb

@@ -1,4 +1,5 @@
-dir /cpu/x86/tsc
+uses CONFIG_UDELAY_TSC
+
 dir /cpu/x86/mtrr
 dir /cpu/x86/fpu
 dir /cpu/x86/mmx
@@ -8,3 +9,9 @@ dir /cpu/x86/cache
 dir /cpu/intel/microcode
 dir /cpu/intel/hyperthreading
 driver model_f2x_init.o
+
+if CONFIG_UDELAY_TSC
+	dir /cpu/x86/tsc
+else
+	object apic_timer.o
+end

src/cpu/intel/model_f2x/apic_timer.c

@@ -0,0 +1,26 @@
+#include <stdint.h>
+#include <delay.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/lapic.h>
+
+void init_timer(void)
+{
+	/* Set the apic timer to no interrupts and periodic mode */
+	lapic_write(LAPIC_LVTT, (1 << 17)|(1<< 16)|(0 << 12)|(0 << 0));
+	/* Set the divider to 1, no divider */
+	lapic_write(LAPIC_TDCR, LAPIC_TDR_DIV_1);
+	/* Set the initial counter to 0xffffffff */
+	lapic_write(LAPIC_TMICT, 0xffffffff);
+}
+
+void udelay(unsigned usecs)
+{
+	uint32_t start, value, ticks;
+	/* Calculate the number of ticks to run, our FSB runs a 200Mhz */
+	ticks = usecs * 200;
+	start = lapic_read(LAPIC_TMCCT);
+	do {
+		value = lapic_read(LAPIC_TMCCT);
+	} while((start - value) < ticks);
+	
+}