+/* Helper function to convert a 32b nanoseconds timestamp to 64b. */
+static inline
+uint64_t ice_tstamp_convert_32b_64b(struct ice_hw *hw, uint32_t in_timestamp)
+{
+ const uint64_t mask = 0xFFFFFFFF;
+ uint32_t hi, lo, lo2, delta;
+ uint64_t time, ns;
+
+ lo = ICE_READ_REG(hw, GLTSYN_TIME_L(0));
+ hi = ICE_READ_REG(hw, GLTSYN_TIME_H(0));
+ lo2 = ICE_READ_REG(hw, GLTSYN_TIME_L(0));
+
+ if (lo2 < lo) {
+ lo = ICE_READ_REG(hw, GLTSYN_TIME_L(0));
+ hi = ICE_READ_REG(hw, GLTSYN_TIME_H(0));
+ }
+
+ time = ((uint64_t)hi << 32) | lo;
+
+ delta = (in_timestamp - (uint32_t)(time & mask));
+ if (delta > (mask / 2)) {
+ delta = ((uint32_t)(time & mask) - in_timestamp);
+ ns = time - delta;
+ } else {
+ ns = time + delta;
+ }
+
+ return ns;
+}
+