+/* Use following macros for conversions between pstate_id and index */
+static inline int idx_to_pstate(unsigned int i)
+{
+ if (unlikely(i >= powernv_pstate_info.nr_pstates)) {
+ pr_warn_once("index %u is out of bound\n", i);
+ return powernv_freqs[powernv_pstate_info.nominal].driver_data;
+ }
+
+ return powernv_freqs[i].driver_data;
+}
+
+static inline unsigned int pstate_to_idx(int pstate)
+{
+ int min = powernv_freqs[powernv_pstate_info.min].driver_data;
+ int max = powernv_freqs[powernv_pstate_info.max].driver_data;
+
+ if (min > 0) {
+ if (unlikely((pstate < max) || (pstate > min))) {
+ pr_warn_once("pstate %d is out of bound\n", pstate);
+ return powernv_pstate_info.nominal;
+ }
+ } else {
+ if (unlikely((pstate > max) || (pstate < min))) {
+ pr_warn_once("pstate %d is out of bound\n", pstate);
+ return powernv_pstate_info.nominal;
+ }
+ }
+ /*
+ * abs() is deliberately used so that is works with
+ * both monotonically increasing and decreasing
+ * pstate values
+ */
+ return abs(pstate - idx_to_pstate(powernv_pstate_info.max));
+}
+