1 // SPDX-License-Identifier: GPL-2.0-only
3  * PSCI CPU idle driver.
29 #include "cpuidle-psci.h"
41 void psci_set_domain_state(u32 state)  in psci_set_domain_state()  argument
43 	__this_cpu_write(domain_state, state);  in psci_set_domain_state()
51 static inline int psci_enter_state(int idx, u32 state)  in psci_enter_state()  argument
53 	return CPU_PM_CPU_IDLE_ENTER_PARAM(psci_cpu_suspend_enter, idx, state);  in psci_enter_state()
61 	u32 *states = data->psci_states;  in __psci_enter_domain_idle_state()
62 	struct device *pd_dev = data->dev;  in __psci_enter_domain_idle_state()
63 	u32 state;  in __psci_enter_domain_idle_state()  local
68 		return -1;  in __psci_enter_domain_idle_state()
78 	state = psci_get_domain_state();  in __psci_enter_domain_idle_state()
79 	if (!state)  in __psci_enter_domain_idle_state()
80 		state = states[idx];  in __psci_enter_domain_idle_state()
82 	ret = psci_cpu_suspend_enter(state) ? -1 : idx;  in __psci_enter_domain_idle_state()
93 	/* Clear the domain state to start fresh when back from idle. */  in __psci_enter_domain_idle_state()
127 		/* Clear domain state to start fresh at next online. */  in psci_idle_cpuhp_down()
146 		pr_warn("Failed %d while setup cpuhp state\n", err);  in psci_idle_init_cpuhp()
152 	u32 *state = __this_cpu_read(psci_cpuidle_data.psci_states);  in psci_enter_idle_state()  local
154 	return psci_enter_state(idx, state[idx]);  in psci_enter_idle_state()
158 	{ .compatible = "arm,idle-state",
163 int psci_dt_parse_state_node(struct device_node *np, u32 *state)  in psci_dt_parse_state_node()  argument
165 	int err = of_property_read_u32(np, "arm,psci-suspend-param", state);  in psci_dt_parse_state_node()
168 		pr_warn("%pOF missing arm,psci-suspend-param property\n", np);  in psci_dt_parse_state_node()
172 	if (!psci_power_state_is_valid(*state)) {  in psci_dt_parse_state_node()
173 		pr_warn("Invalid PSCI power state %#x\n", *state);  in psci_dt_parse_state_node()
174 		return -EINVAL;  in psci_dt_parse_state_node()
188 	data->dev = psci_dt_attach_cpu(cpu);  in psci_dt_cpu_init_topology()
189 	if (IS_ERR_OR_NULL(data->dev))  in psci_dt_cpu_init_topology()
190 		return PTR_ERR_OR_ZERO(data->dev);  in psci_dt_cpu_init_topology()
193 	 * Using the deepest state for the CPU to trigger a potential selection  in psci_dt_cpu_init_topology()
194 	 * of a shared state for the domain, assumes the domain states are all  in psci_dt_cpu_init_topology()
197 	drv->states[state_count - 1].enter = psci_enter_domain_idle_state;  in psci_dt_cpu_init_topology()
198 	drv->states[state_count - 1].enter_s2idle = psci_enter_s2idle_domain_idle_state;  in psci_dt_cpu_init_topology()
213 	state_count++; /* Add WFI state too */  in psci_dt_cpu_init_idle()
217 		return -ENOMEM;  in psci_dt_cpu_init_idle()
220 		state_node = of_get_cpu_state_node(cpu_node, i - 1);  in psci_dt_cpu_init_idle()
230 		pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);  in psci_dt_cpu_init_idle()
234 		return -ENODEV;  in psci_dt_cpu_init_idle()
241 	/* Idle states parsed correctly, store them in the per-cpu struct. */  in psci_dt_cpu_init_idle()
242 	data->psci_states = psci_states;  in psci_dt_cpu_init_idle()
254 	 * idle states must not be enabled, so bail out  in psci_cpu_init_idle()
257 		return -EOPNOTSUPP;  in psci_cpu_init_idle()
261 		return -ENODEV;  in psci_cpu_init_idle()
274 	psci_dt_detach_cpu(data->dev);  in psci_cpu_deinit_idle()
287 		return -ENODEV;  in psci_idle_init_cpu()
290 	 * Check whether the enable-method for the cpu is PSCI, fail  in psci_idle_init_cpu()
293 	enable_method = of_get_property(cpu_node, "enable-method", NULL);  in psci_idle_init_cpu()
295 		ret = -ENODEV;  in psci_idle_init_cpu()
303 		return -ENOMEM;  in psci_idle_init_cpu()
305 	drv->name = "psci_idle";  in psci_idle_init_cpu()
306 	drv->owner = THIS_MODULE;  in psci_idle_init_cpu()
307 	drv->cpumask = (struct cpumask *)cpumask_of(cpu);  in psci_idle_init_cpu()
310 	 * PSCI idle states relies on architectural WFI to be represented as  in psci_idle_init_cpu()
311 	 * state index 0.  in psci_idle_init_cpu()
313 	drv->states[0].enter = psci_enter_idle_state;  in psci_idle_init_cpu()
314 	drv->states[0].exit_latency = 1;  in psci_idle_init_cpu()
315 	drv->states[0].target_residency = 1;  in psci_idle_init_cpu()
316 	drv->states[0].power_usage = UINT_MAX;  in psci_idle_init_cpu()
317 	strcpy(drv->states[0].name, "WFI");  in psci_idle_init_cpu()
318 	strcpy(drv->states[0].desc, "ARM WFI");  in psci_idle_init_cpu()
321 	 * If no DT idle states are detected (ret == 0) let the driver  in psci_idle_init_cpu()
323 	 * initialize the idle driver if only wfi is supported, the  in psci_idle_init_cpu()
324 	 * default archictectural back-end already executes wfi  in psci_idle_init_cpu()
325 	 * on idle entry.  in psci_idle_init_cpu()
329 		return ret ? : -ENODEV;  in psci_idle_init_cpu()
332 	 * Initialize PSCI idle states.  in psci_idle_init_cpu()
336 		pr_err("CPU %d failed to PSCI idle\n", cpu);  in psci_idle_init_cpu()
353  * psci_idle_probe - Initializes PSCI cpuidle driver
366 		ret = psci_idle_init_cpu(&pdev->dev, cpu);  in psci_cpuidle_probe()
375 	while (--cpu >= 0) {  in psci_cpuidle_probe()
388 		.name = "psci-cpuidle",
401 	pdev = platform_device_register_simple("psci-cpuidle", -1, NULL, 0);  in psci_idle_init()