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
41 	u64 mask;  member
58 	for (i = index + 1; i < drv->state_count; i++) {  in get_snooze_timeout()
59 		if (dev->states_usage[i].disable)  in get_snooze_timeout()
62 		return drv->states[i].target_residency * tb_ticks_per_usec;  in get_snooze_timeout()
112 /* Register for fastsleep only in oneshot mode of broadcast */
145 			 stop_psscr_table[index].mask);  in stop_loop()
193 	drv->state_count = 0;  in powernv_cpuidle_driver_init()
200 		drv->states[drv->state_count] =	/* structure copy */  in powernv_cpuidle_driver_init()
203 		drv->state_count += 1;  in powernv_cpuidle_driver_init()
213 	 * drv->cpumask defaults to cpu_possible_mask in  in powernv_cpuidle_driver_init()
216 	 * cannot be hot-added later at run time.  in powernv_cpuidle_driver_init()
219 	 * incorrect, so pass a correct CPU mask to the generic cpuidle driver.  in powernv_cpuidle_driver_init()
222 	drv->cpumask = (struct cpumask *)cpu_present_mask;  in powernv_cpuidle_driver_init()
244 	stop_psscr_table[index].mask = psscr_mask;  in add_powernv_state()
259 		pr_warn("cpuidle-powernv : Only Snooze is available\n");  in powernv_add_idle_states()
267 	 * Since snooze is used as first idle state, max idle states allowed is  in powernv_add_idle_states()
268 	 * CPUIDLE_STATE_MAX -1  in powernv_add_idle_states()
270 	if (nr_pnv_idle_states > CPUIDLE_STATE_MAX - 1) {  in powernv_add_idle_states()
271 		pr_warn("cpuidle-powernv: discovered idle states more than allowed");  in powernv_add_idle_states()
272 		dt_idle_states = CPUIDLE_STATE_MAX - 1;  in powernv_add_idle_states()
276 	 * If the idle states use stop instruction, probe for psscr values  in powernv_add_idle_states()
277 	 * and psscr mask which are necessary to specify required stop level.  in powernv_add_idle_states()
288 		 * Skip the platform idle state whose flag isn't in  in powernv_add_idle_states()
289 		 * the supported_cpuidle_states flag mask.  in powernv_add_idle_states()
291 		if ((state->flags & supported_flags) != state->flags)  in powernv_add_idle_states()
294 		 * If an idle state has exit latency beyond  in powernv_add_idle_states()
296 		 * in cpu-idle.  in powernv_add_idle_states()
298 		if (state->latency_ns > POWERNV_THRESHOLD_LATENCY_NS)  in powernv_add_idle_states()
304 		exit_latency = DIV_ROUND_UP(state->latency_ns, 1000);  in powernv_add_idle_states()
305 		target_residency = DIV_ROUND_UP(state->residency_ns, 1000);  in powernv_add_idle_states()
307 		if (has_stop_states && !(state->valid))  in powernv_add_idle_states()
310 		if (state->flags & OPAL_PM_TIMEBASE_STOP)  in powernv_add_idle_states()
313 		if (state->flags & OPAL_PM_NAP_ENABLED) {  in powernv_add_idle_states()
319 			add_powernv_state(nr_idle_states, state->name,  in powernv_add_idle_states()
322 					  state->psscr_val,  in powernv_add_idle_states()
323 					  state->psscr_mask);  in powernv_add_idle_states()
331 		else if (state->flags & OPAL_PM_SLEEP_ENABLED ||  in powernv_add_idle_states()
332 			 state->flags & OPAL_PM_SLEEP_ENABLED_ER1) {  in powernv_add_idle_states()
339 			add_powernv_state(nr_idle_states, state->name,  in powernv_add_idle_states()
342 					  state->psscr_val,  in powernv_add_idle_states()
343 					  state->psscr_mask);  in powernv_add_idle_states()
361 		return -ENODEV;  in powernv_idle_probe()
365 		/* Device tree can indicate more idle states */  in powernv_idle_probe()
371  		return -ENODEV;  in powernv_idle_probe()