1 // SPDX-License-Identifier: GPL-2.0-only
3  * PSCI CPU idle driver.
33 					   idx, state[idx - 1]);  in psci_enter_idle_state()
40 	 * PSCI idle states relies on architectural WFI to
43 	.states[0] = {
54 	{ .compatible = "arm,idle-state",
61 	int err = of_property_read_u32(np, "arm,psci-suspend-param", state);  in psci_dt_parse_state_node()
64 		pr_warn("%pOF missing arm,psci-suspend-param property\n", np);  in psci_dt_parse_state_node()
70 		return -EINVAL;  in psci_dt_parse_state_node()
82 	/* Count idle states */  in psci_dt_cpu_init_idle()
83 	while ((state_node = of_parse_phandle(cpu_node, "cpu-idle-states",  in psci_dt_cpu_init_idle()
90 		return -ENODEV;  in psci_dt_cpu_init_idle()
94 		return -ENOMEM;  in psci_dt_cpu_init_idle()
97 		state_node = of_parse_phandle(cpu_node, "cpu-idle-states", i);  in psci_dt_cpu_init_idle()
104 		pr_debug("psci-power-state %#x index %d\n", psci_states[i], i);  in psci_dt_cpu_init_idle()
107 	/* Idle states parsed correctly, initialize per-cpu pointer */  in psci_dt_cpu_init_idle()
123 	 * idle states must not be enabled, so bail out  in psci_cpu_init_idle()
126 		return -EOPNOTSUPP;  in psci_cpu_init_idle()
130 		return -ENODEV;  in psci_cpu_init_idle()
148 		return -ENODEV;  in psci_idle_init_cpu()
151 	 * Check whether the enable-method for the cpu is PSCI, fail  in psci_idle_init_cpu()
154 	enable_method = of_get_property(cpu_node, "enable-method", NULL);  in psci_idle_init_cpu()
156 		ret = -ENODEV;  in psci_idle_init_cpu()
164 		return -ENOMEM;  in psci_idle_init_cpu()
166 	drv->cpumask = (struct cpumask *)cpumask_of(cpu);  in psci_idle_init_cpu()
169 	 * Initialize idle states data, starting at index 1, since  in psci_idle_init_cpu()
170 	 * by default idle state 0 is the quiescent state reached  in psci_idle_init_cpu()
173 	 * If no DT idle states are detected (ret == 0) let the driver  in psci_idle_init_cpu()
175 	 * initialize the idle driver if only wfi is supported, the  in psci_idle_init_cpu()
176 	 * default archictectural back-end already executes wfi  in psci_idle_init_cpu()
177 	 * on idle entry.  in psci_idle_init_cpu()
181 		ret = ret ? : -ENODEV;  in psci_idle_init_cpu()
186 	 * Initialize PSCI idle states.  in psci_idle_init_cpu()
190 		pr_err("CPU %d failed to PSCI idle\n", cpu);  in psci_idle_init_cpu()
206  * psci_idle_init - Initializes PSCI cpuidle driver
227 	while (--cpu >= 0) {  in psci_idle_init()