1 // SPDX-License-Identifier: GPL-2.0-only
29 #include "cpuidle-psci.h"
54 						    struct cpuidle_driver *drv, int idx,  in __psci_enter_domain_idle_state()  argument
58 	u32 *states = data->psci_states;  in __psci_enter_domain_idle_state()
59 	struct device *pd_dev = data->dev;  in __psci_enter_domain_idle_state()
65 		return -1;  in __psci_enter_domain_idle_state()
77 	ret = psci_cpu_suspend_enter(state) ? -1 : idx;  in __psci_enter_domain_idle_state()
87 	psci_set_domain_state(0);  in __psci_enter_domain_idle_state()
92 					struct cpuidle_driver *drv, int idx)  in psci_enter_domain_idle_state()  argument
94 	return __psci_enter_domain_idle_state(dev, drv, idx, false);  in psci_enter_domain_idle_state()
98 					       struct cpuidle_driver *drv,  in psci_enter_s2idle_domain_idle_state()  argument
101 	return __psci_enter_domain_idle_state(dev, drv, idx, true);  in psci_enter_s2idle_domain_idle_state()
111 	return 0;  in psci_idle_cpuhp_up()
121 		psci_set_domain_state(0);  in psci_idle_cpuhp_down()
124 	return 0;  in psci_idle_cpuhp_down()
134 		dev = per_cpu_ptr(&psci_cpuidle_data, cpu)->dev;  in psci_idle_syscore_switch()
145 			/* Clear domain state to re-start fresh. */  in psci_idle_syscore_switch()
147 				psci_set_domain_state(0);  in psci_idle_syscore_switch()
157 	return 0;  in psci_idle_syscore_suspend()
192 					   struct cpuidle_driver *drv, int idx)  in psci_enter_idle_state()  argument
200 	{ .compatible = "arm,idle-state",
207 	int err = of_property_read_u32(np, "arm,psci-suspend-param", state);  in psci_dt_parse_state_node()
210 		pr_warn("%pOF missing arm,psci-suspend-param property\n", np);  in psci_dt_parse_state_node()
216 		return -EINVAL;  in psci_dt_parse_state_node()
219 	return 0;  in psci_dt_parse_state_node()
222 static int psci_dt_cpu_init_topology(struct cpuidle_driver *drv,  in psci_dt_cpu_init_topology()  argument
228 		return 0;  in psci_dt_cpu_init_topology()
230 	data->dev = dt_idle_attach_cpu(cpu, "psci");  in psci_dt_cpu_init_topology()
231 	if (IS_ERR_OR_NULL(data->dev))  in psci_dt_cpu_init_topology()
232 		return PTR_ERR_OR_ZERO(data->dev);  in psci_dt_cpu_init_topology()
242 	drv->states[state_count - 1].enter_s2idle = psci_enter_s2idle_domain_idle_state;  in psci_dt_cpu_init_topology()
244 		drv->states[state_count - 1].enter = psci_enter_domain_idle_state;  in psci_dt_cpu_init_topology()
248 	return 0;  in psci_dt_cpu_init_topology()
251 static int psci_dt_cpu_init_idle(struct device *dev, struct cpuidle_driver *drv,  in psci_dt_cpu_init_idle()  argument
255 	int i, ret = 0;  in psci_dt_cpu_init_idle()
264 		return -ENOMEM;  in psci_dt_cpu_init_idle()
267 		state_node = of_get_cpu_state_node(cpu_node, i - 1);  in psci_dt_cpu_init_idle()
277 		pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);  in psci_dt_cpu_init_idle()
281 		return -ENODEV;  in psci_dt_cpu_init_idle()
284 	ret = psci_dt_cpu_init_topology(drv, data, state_count, cpu);  in psci_dt_cpu_init_idle()
285 	if (ret < 0)  in psci_dt_cpu_init_idle()
288 	/* Idle states parsed correctly, store them in the per-cpu struct. */  in psci_dt_cpu_init_idle()
289 	data->psci_states = psci_states;  in psci_dt_cpu_init_idle()
290 	return 0;  in psci_dt_cpu_init_idle()
293 static int psci_cpu_init_idle(struct device *dev, struct cpuidle_driver *drv,  in psci_cpu_init_idle()  argument
304 		return -EOPNOTSUPP;  in psci_cpu_init_idle()
308 		return -ENODEV;  in psci_cpu_init_idle()
310 	ret = psci_dt_cpu_init_idle(dev, drv, cpu_node, state_count, cpu);  in psci_cpu_init_idle()
321 	dt_idle_detach_cpu(data->dev);  in psci_cpu_deinit_idle()
328 	struct cpuidle_driver *drv;  in psci_idle_init_cpu()  local
331 	int ret = 0;  in psci_idle_init_cpu()
335 		return -ENODEV;  in psci_idle_init_cpu()
338 	 * Check whether the enable-method for the cpu is PSCI, fail  in psci_idle_init_cpu()
341 	enable_method = of_get_property(cpu_node, "enable-method", NULL);  in psci_idle_init_cpu()
343 		ret = -ENODEV;  in psci_idle_init_cpu()
349 	drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);  in psci_idle_init_cpu()
350 	if (!drv)  in psci_idle_init_cpu()
351 		return -ENOMEM;  in psci_idle_init_cpu()
353 	drv->name = "psci_idle";  in psci_idle_init_cpu()
354 	drv->owner = THIS_MODULE;  in psci_idle_init_cpu()
355 	drv->cpumask = (struct cpumask *)cpumask_of(cpu);  in psci_idle_init_cpu()
359 	 * state index 0.  in psci_idle_init_cpu()
361 	drv->states[0].enter = psci_enter_idle_state;  in psci_idle_init_cpu()
362 	drv->states[0].exit_latency = 1;  in psci_idle_init_cpu()
363 	drv->states[0].target_residency = 1;  in psci_idle_init_cpu()
364 	drv->states[0].power_usage = UINT_MAX;  in psci_idle_init_cpu()
365 	strcpy(drv->states[0].name, "WFI");  in psci_idle_init_cpu()
366 	strcpy(drv->states[0].desc, "ARM WFI");  in psci_idle_init_cpu()
369 	 * If no DT idle states are detected (ret == 0) let the driver  in psci_idle_init_cpu()
372 	 * default archictectural back-end already executes wfi  in psci_idle_init_cpu()
375 	ret = dt_init_idle_driver(drv, psci_idle_state_match, 1);  in psci_idle_init_cpu()
376 	if (ret <= 0)  in psci_idle_init_cpu()
377 		return ret ? : -ENODEV;  in psci_idle_init_cpu()
382 	ret = psci_cpu_init_idle(dev, drv, cpu, ret);  in psci_idle_init_cpu()
388 	ret = cpuidle_register(drv, NULL);  in psci_idle_init_cpu()
392 	cpuidle_cooling_register(drv);  in psci_idle_init_cpu()
394 	return 0;  in psci_idle_init_cpu()
401  * psci_idle_probe - Initializes PSCI cpuidle driver
410 	struct cpuidle_driver *drv;  in psci_cpuidle_probe()  local
414 		ret = psci_idle_init_cpu(&pdev->dev, cpu);  in psci_cpuidle_probe()
421 	return 0;  in psci_cpuidle_probe()
424 	while (--cpu >= 0) {  in psci_cpuidle_probe()
426 		drv = cpuidle_get_cpu_driver(dev);  in psci_cpuidle_probe()
427 		cpuidle_unregister(drv);  in psci_cpuidle_probe()
437 		.name = "psci-cpuidle",
450 	pdev = platform_device_register_simple("psci-cpuidle", -1, NULL, 0);  in psci_idle_init()
456 	return 0;  in psci_idle_init()