1 // SPDX-License-Identifier: GPL-2.0
3  * PM domains for CPUs via genpd - managed by cpuidle-psci.
22 #include "cpuidle-psci.h"
26 	struct device_node *node;  member
34 	struct genpd_power_state *state = &pd->states[pd->state_idx];  in psci_pd_power_off()
37 	if (!state->data)  in psci_pd_power_off()
41 		return -EBUSY;  in psci_pd_power_off()
43 	/* OSI mode is enabled, set the corresponding domain state. */  in psci_pd_power_off()
44 	pd_state = state->data;  in psci_pd_power_off()
64 			ret = -ENOMEM;  in psci_pd_parse_state_nodes()
74 	i--;  in psci_pd_parse_state_nodes()
75 	for (; i >= 0; i--)  in psci_pd_parse_state_nodes()
85 	/* Parse the domain idle states. */  in psci_pd_parse_states()
114 	int ret = -ENOMEM, state_count = 0;  in psci_pd_init()
124 	pd->name = kasprintf(GFP_KERNEL, "%pOF", np);  in psci_pd_init()
125 	if (!pd->name)  in psci_pd_init()
129 	 * Parse the domain idle states and let genpd manage the state selection  in psci_pd_init()
130 	 * for those being compatible with "domain-idle-state".  in psci_pd_init()
136 	pd->free_states = psci_pd_free_states;  in psci_pd_init()
137 	pd->name = kbasename(pd->name);  in psci_pd_init()
138 	pd->states = states;  in psci_pd_init()
139 	pd->state_count = state_count;  in psci_pd_init()
140 	pd->flags |= GENPD_FLAG_IRQ_SAFE | GENPD_FLAG_CPU_DOMAIN;  in psci_pd_init()
142 	/* Allow power off when OSI has been successfully enabled. */  in psci_pd_init()
144 		pd->power_off = psci_pd_power_off;  in psci_pd_init()
146 		pd->flags |= GENPD_FLAG_ALWAYS_ON;  in psci_pd_init()
161 	pd_provider->node = of_node_get(np);  in psci_pd_init()
162 	list_add(&pd_provider->link, &psci_pd_providers);  in psci_pd_init()
164 	pr_debug("init PM domain %s\n", pd->name);  in psci_pd_init()
170 	kfree(pd->name);  in psci_pd_init()
176 	pr_err("failed to init PM domain ret=%d %pOF\n", ret, np);  in psci_pd_init()
187 		of_genpd_del_provider(pd_provider->node);  in psci_pd_remove()
189 		genpd = of_genpd_remove_last(pd_provider->node);  in psci_pd_remove()
193 		of_node_put(pd_provider->node);  in psci_pd_remove()
194 		list_del(&pd_provider->link);  in psci_pd_remove()
201 	struct device_node *node;  in psci_pd_init_topology()  local
205 	for_each_child_of_node(np, node) {  in psci_pd_init_topology()
206 		if (of_parse_phandle_with_args(node, "power-domains",  in psci_pd_init_topology()
207 					"#power-domain-cells", 0, &parent))  in psci_pd_init_topology()
210 		child.np = node;  in psci_pd_init_topology()
215 			of_node_put(node);  in psci_pd_init_topology()
242 	 * All devices have now been attached/probed to the PM domain topology,  in psci_cpuidle_domain_sync_state()
243 	 * hence it's fine to allow domain states to be picked.  in psci_cpuidle_domain_sync_state()
249 	{ .compatible = "arm,psci-1.0" },
255 	struct device_node *np = pdev->dev.of_node;  in psci_cpuidle_domain_probe()
256 	struct device_node *node;  in psci_cpuidle_domain_probe()  local
261 		return -ENODEV;  in psci_cpuidle_domain_probe()
267 	 * Parse child nodes for the "#power-domain-cells" property and  in psci_cpuidle_domain_probe()
268 	 * initialize a genpd/genpd-of-provider pair when it's found.  in psci_cpuidle_domain_probe()
270 	for_each_child_of_node(np, node) {  in psci_cpuidle_domain_probe()
271 		if (!of_find_property(node, "#power-domain-cells", NULL))  in psci_cpuidle_domain_probe()
274 		ret = psci_pd_init(node, use_osi);  in psci_cpuidle_domain_probe()
290 	pr_info("Initialized CPU PM domain topology\n");  in psci_cpuidle_domain_probe()
294 	of_node_put(node);  in psci_cpuidle_domain_probe()
307 		.name = "psci-cpuidle-domain",