1 // SPDX-License-Identifier: GPL-2.0
3  *  cpuidle-powernv - idle state cpuidle driver.
4  *  Adapted from drivers/cpuidle/cpuidle-pseries
26  * Expose only those Hardware idle states via the cpuidle framework
58 	for (i = index + 1; i < drv->state_count; i++) {  in get_snooze_timeout()
59 		struct cpuidle_state *s = &drv->states[i];  in get_snooze_timeout()
60 		struct cpuidle_state_usage *su = &dev->states_usage[i];  in get_snooze_timeout()
62 		if (s->disabled || su->disable)  in get_snooze_timeout()
65 		return s->target_residency * tb_ticks_per_usec;  in get_snooze_timeout()
153  * States for dedicated partition case.
196 	drv->state_count = 0;  in powernv_cpuidle_driver_init()
203 		drv->states[drv->state_count] =	/* structure copy */  in powernv_cpuidle_driver_init()
206 		drv->state_count += 1;  in powernv_cpuidle_driver_init()
216 	 * drv->cpumask defaults to cpu_possible_mask in  in powernv_cpuidle_driver_init()
219 	 * cannot be hot-added later at run time.  in powernv_cpuidle_driver_init()
225 	drv->cpumask = (struct cpumask *)cpu_present_mask;  in powernv_cpuidle_driver_init()
251  * Returns 0 if prop1_len == prop2_len. Else returns -1
259 	pr_warn("cpuidle-powernv: array sizes don't match for %s and %s\n",  in validate_dt_prop_sizes()
261 	return -1;  in validate_dt_prop_sizes()
276 		pr_warn("cpuidle-powernv : Only Snooze is available\n");  in powernv_add_idle_states()
280 	/* TODO: Count only states which are eligible for cpuidle */  in powernv_add_idle_states()
284 	 * Since snooze is used as first idle state, max idle states allowed is  in powernv_add_idle_states()
285 	 * CPUIDLE_STATE_MAX -1  in powernv_add_idle_states()
287 	if (nr_pnv_idle_states > CPUIDLE_STATE_MAX - 1) {  in powernv_add_idle_states()
288 		pr_warn("cpuidle-powernv: discovered idle states more than allowed");  in powernv_add_idle_states()
289 		dt_idle_states = CPUIDLE_STATE_MAX - 1;  in powernv_add_idle_states()
293 	 * If the idle states use stop instruction, probe for psscr values  in powernv_add_idle_states()
305 		 * Skip the platform idle state whose flag isn't in  in powernv_add_idle_states()
308 		if ((state->flags & supported_flags) != state->flags)  in powernv_add_idle_states()
311 		 * If an idle state has exit latency beyond  in powernv_add_idle_states()
313 		 * in cpu-idle.  in powernv_add_idle_states()
315 		if (state->latency_ns > POWERNV_THRESHOLD_LATENCY_NS)  in powernv_add_idle_states()
321 		exit_latency = DIV_ROUND_UP(state->latency_ns, 1000);  in powernv_add_idle_states()
322 		target_residency = DIV_ROUND_UP(state->residency_ns, 1000);  in powernv_add_idle_states()
324 		if (has_stop_states && !(state->valid))  in powernv_add_idle_states()
327 		if (state->flags & OPAL_PM_TIMEBASE_STOP)  in powernv_add_idle_states()
330 		if (state->flags & OPAL_PM_NAP_ENABLED) {  in powernv_add_idle_states()
336 			add_powernv_state(nr_idle_states, state->name,  in powernv_add_idle_states()
339 					  state->psscr_val,  in powernv_add_idle_states()
340 					  state->psscr_mask);  in powernv_add_idle_states()
344 		 * All cpuidle states with CPUIDLE_FLAG_TIMER_STOP set must come  in powernv_add_idle_states()
348 		else if (state->flags & OPAL_PM_SLEEP_ENABLED ||  in powernv_add_idle_states()
349 			 state->flags & OPAL_PM_SLEEP_ENABLED_ER1) {  in powernv_add_idle_states()
356 			add_powernv_state(nr_idle_states, state->name,  in powernv_add_idle_states()
359 					  state->psscr_val,  in powernv_add_idle_states()
360 					  state->psscr_mask);  in powernv_add_idle_states()
378 		return -ENODEV;  in powernv_idle_probe()
382 		/* Device tree can indicate more idle states */  in powernv_idle_probe()
388  		return -ENODEV;  in powernv_idle_probe()