intel/quark: Switch to TSC_MONOTONIC_TIMER

Change-Id: I5ea899863c5b9ed516a55ba2e7524dd33a6f651d
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36554
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/quark/Kconfig

@@ -36,6 +36,7 @@ config CPU_SPECIFIC_OPTIONS
 	select SPI_FLASH
 	select UART_OVERRIDE_REFCLK
 	select UDELAY_TSC
+	select TSC_MONOTONIC_TIMER
 	select UNCOMPRESSED_RAMSTAGE
 	select USE_MARCH_586
 	select NO_SMM

src/soc/intel/quark/tsc_freq.c

@@ -14,21 +14,10 @@
  * GNU General Public License for more details.
  */
 
-#include <stdint.h>
-#include <cpu/x86/msr.h>
 #include <cpu/x86/tsc.h>
-#include <timer.h>
 
 unsigned long tsc_freq_mhz(void)
 {
 	/* CPU freq = 400 MHz */
 	return 400;
 }
-
-void timer_monotonic_get(struct mono_time *mt)
-{
-	uint64_t tsc_value;
-
-	tsc_value = rdtscll();
-	mt->microseconds = tsc_value / tsc_freq_mhz();
-}