// SPDX-License-Identifier: GPL-2.0-only /* * PM domains for CPUs via genpd. * * Copyright (C) 2019 Linaro Ltd. * Author: Ulf Hansson * * Copyright (c) 2021 Western Digital Corporation or its affiliates. * Copyright (c) 2022 Ventana Micro Systems Inc. */ #define pr_fmt(fmt) "dt-idle-genpd: " fmt #include #include #include #include #include #include #include #include "dt_idle_genpd.h" static int pd_parse_state_nodes( int (*parse_state)(struct device_node *, u32 *), struct genpd_power_state *states, int state_count) { int i, ret; u32 state, *state_buf; for (i = 0; i < state_count; i++) { ret = parse_state(to_of_node(states[i].fwnode), &state); if (ret) goto free_state; state_buf = kmalloc(sizeof(u32), GFP_KERNEL); if (!state_buf) { ret = -ENOMEM; goto free_state; } *state_buf = state; states[i].data = state_buf; } return 0; free_state: i--; for (; i >= 0; i--) kfree(states[i].data); return ret; } static int pd_parse_states(struct device_node *np, int (*parse_state)(struct device_node *, u32 *), struct genpd_power_state **states, int *state_count) { int ret; /* Parse the domain idle states. */ ret = of_genpd_parse_idle_states(np, states, state_count); if (ret) return ret; /* Fill out the dt specifics for each found state. */ ret = pd_parse_state_nodes(parse_state, *states, *state_count); if (ret) kfree(*states); return ret; } static void pd_free_states(struct genpd_power_state *states, unsigned int state_count) { int i; for (i = 0; i < state_count; i++) kfree(states[i].data); kfree(states); } void dt_idle_pd_free(struct generic_pm_domain *pd) { pd_free_states(pd->states, pd->state_count); kfree(pd->name); kfree(pd); } struct generic_pm_domain *dt_idle_pd_alloc(struct device_node *np, int (*parse_state)(struct device_node *, u32 *)) { struct generic_pm_domain *pd; struct genpd_power_state *states = NULL; int ret, state_count = 0; pd = kzalloc(sizeof(*pd), GFP_KERNEL); if (!pd) goto out; pd->name = kasprintf(GFP_KERNEL, "%pOF", np); if (!pd->name) goto free_pd; /* * Parse the domain idle states and let genpd manage the state selection * for those being compatible with "domain-idle-state". */ ret = pd_parse_states(np, parse_state, &states, &state_count); if (ret) goto free_name; pd->free_states = pd_free_states; pd->name = kbasename(pd->name); pd->states = states; pd->state_count = state_count; pr_debug("alloc PM domain %s\n", pd->name); return pd; free_name: kfree(pd->name); free_pd: kfree(pd); out: pr_err("failed to alloc PM domain %pOF\n", np); return NULL; } int dt_idle_pd_init_topology(struct device_node *np) { struct of_phandle_args child, parent; int ret; for_each_child_of_node_scoped(np, node) { if (of_parse_phandle_with_args(node, "power-domains", "#power-domain-cells", 0, &parent)) continue; child.np = node; child.args_count = 0; ret = of_genpd_add_subdomain(&parent, &child); of_node_put(parent.np); if (ret) return ret; } return 0; } int dt_idle_pd_remove_topology(struct device_node *np) { struct of_phandle_args child, parent; int ret; for_each_child_of_node_scoped(np, node) { if (of_parse_phandle_with_args(node, "power-domains", "#power-domain-cells", 0, &parent)) continue; child.np = node; child.args_count = 0; ret = of_genpd_remove_subdomain(&parent, &child); of_node_put(parent.np); if (ret) return ret; } return 0; } struct device *dt_idle_attach_cpu(int cpu, const char *name) { struct device *dev; dev = dev_pm_domain_attach_by_name(get_cpu_device(cpu), name); if (IS_ERR_OR_NULL(dev)) return dev; pm_runtime_irq_safe(dev); if (cpu_online(cpu)) pm_runtime_get_sync(dev); dev_pm_syscore_device(dev, true); return dev; } void dt_idle_detach_cpu(struct device *dev) { if (IS_ERR_OR_NULL(dev)) return; dev_pm_domain_detach(dev, false); }