1 files changed, 29 insertions, 2 deletions
diff --git a/payloads/libpayload/drivers/timer/cygnus.c b/payloads/libpayload/drivers/timer/cygnus.c
index 1603549..e627d3e 100644
--- a/payloads/libpayload/drivers/timer/cygnus.c
+++ b/payloads/libpayload/drivers/timer/cygnus.c
@@ -18,12 +18,39 @@
  */
 #include <libpayload.h>
 
+struct cygnus_timer {
+	u32 gtim_glob_low;
+	u32 gtim_glob_hi;
+	u32 gtim_glob_ctrl;
+};
+
+static struct cygnus_timer * const timer_ptr =
+		(void *)CONFIG_LP_IPROC_PERIPH_GLB_TIM_REG_BASE;
+
 uint64_t timer_hz(void)
 {
-	return 0;
+	/*
+	 * this is set up by coreboot as follows:
+	 *
+	 * PERIPH_CLOCK /
+	 * (((TIMER_GLB_TIM_CTRL_PRESC & TIMER_GLB_TIM_CTRL_PRESC_MASK)>>8) + 1)
+	 *
+	 * where PERIPH_CLOCK is typically 500000000.
+	 */
+	return 500000000;
 }
 
 uint64_t timer_raw_value(void)
 {
-	return 0;
+	uint64_t cur_tick;
+	uint32_t count_h;
+	uint32_t count_l;
+
+	do {
+		count_h = readl(&timer_ptr->gtim_glob_hi);
+		count_l = readl(&timer_ptr->gtim_glob_low);
+		cur_tick = readl(&timer_ptr->gtim_glob_hi);
+	} while (cur_tick != count_h);
+
+	return (cur_tick << 32) + count_l;
 }