@@ -218,6 +218,46 @@ static inline void set_pmspr(unsigned long sprn, unsigned long val)
BUG();
}
+/**
+ * Computes the current frequency on this cpu
+ * and stores the result in *ret_freq.
+ */
+static void powernv_get_cpu_freq(void *ret_freq)
+{
+ unsigned long pmspr_val;
+ long pstate_id;
+ int *cur_freq, freq;
+
+ cur_freq = (int *)ret_freq;
+ pmspr_val = get_pmspr(SPRN_PMSR);
+ pstate_id = pmspr_val;
+ pstate_id = pstate_id >> 56;
+ WARN_ON(pstate_id > 0);
+ freq = pstate_id_to_freq(pstate_id);
+ pr_debug("cpu %d pmsr %lx pstate_id %ld frequency %d \n",
+ smp_processor_id(), pmspr_val, pstate_id, freq);
+ *cur_freq = freq;
+}
+
+/**
+ * Returns the cpu frequency as reported by the firmware for 'cpu'.
+ * This value is reported through the sysfs file cpuinfo_cur_freq.
+ */
+unsigned int powernv_cpufreq_get(unsigned int cpu)
+{
+ int ret_freq;
+ cpumask_var_t sibling_mask;
+
+ if (!zalloc_cpumask_var(&sibling_mask, GFP_KERNEL))
+ return -ENOMEM;
+
+ powernv_cpu_to_core_mask(cpu, sibling_mask);
+ smp_call_function_any(sibling_mask, powernv_get_cpu_freq, &ret_freq, 1);
+
+ free_cpumask_var(sibling_mask);
+ return ret_freq;
+}
+
static void set_pstate(void *pstate)
{
unsigned long val;
@@ -310,6 +350,7 @@ static int powernv_cpufreq_target(struct cpufreq_policy *policy,
static struct cpufreq_driver powernv_cpufreq_driver = {
.verify = powernv_cpufreq_verify,
.target = powernv_cpufreq_target,
+ .get = powernv_cpufreq_get,
.init = powernv_cpufreq_cpu_init,
.exit = powernv_cpufreq_cpu_exit,
.name = "powernv-cpufreq",