// SPDX-License-Identifier: GPL-2.0 /* * SCMI Generic power domain support. * * Copyright (C) 2018 ARM Ltd. */ #include <linux/err.h> #include <linux/io.h> #include <linux/module.h> #include <linux/pm_domain.h> #include <linux/scmi_protocol.h> struct scmi_pm_domain { struct generic_pm_domain genpd; const struct scmi_handle *handle; const char *name; u32 domain; }; #define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd) static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on) { int ret; u32 state, ret_state; struct scmi_pm_domain *pd = to_scmi_pd(domain); const struct scmi_power_ops *ops = pd->handle->power_ops; if (power_on) state = SCMI_POWER_STATE_GENERIC_ON; else state = SCMI_POWER_STATE_GENERIC_OFF; ret = ops->state_set(pd->handle, pd->domain, state); if (!ret) ret = ops->state_get(pd->handle, pd->domain, &ret_state); if (!ret && state != ret_state) return -EIO; return ret; } static int scmi_pd_power_on(struct generic_pm_domain *domain) { return scmi_pd_power(domain, true); } static int scmi_pd_power_off(struct generic_pm_domain *domain) { return scmi_pd_power(domain, false); } static int scmi_pm_domain_probe(struct scmi_device *sdev) { int num_domains, i; struct device *dev = &sdev->dev; struct device_node *np = dev->of_node; struct scmi_pm_domain *scmi_pd; struct genpd_onecell_data *scmi_pd_data; struct generic_pm_domain **domains; const struct scmi_handle *handle = sdev->handle; if (!handle || !handle->power_ops) return -ENODEV; num_domains = handle->power_ops->num_domains_get(handle); if (num_domains < 0) { dev_err(dev, "number of domains not found\n"); return num_domains; } scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL); if (!scmi_pd) return -ENOMEM; scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL); if (!scmi_pd_data) return -ENOMEM; domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL); if (!domains) return -ENOMEM; for (i = 0; i < num_domains; i++, scmi_pd++) { u32 state; domains[i] = &scmi_pd->genpd; scmi_pd->domain = i; scmi_pd->handle = handle; scmi_pd->name = handle->power_ops->name_get(handle, i); scmi_pd->genpd.name = scmi_pd->name; scmi_pd->genpd.power_off = scmi_pd_power_off; scmi_pd->genpd.power_on = scmi_pd_power_on; if (handle->power_ops->state_get(handle, i, &state)) { dev_warn(dev, "failed to get state for domain %d\n", i); continue; } pm_genpd_init(&scmi_pd->genpd, NULL, state == SCMI_POWER_STATE_GENERIC_OFF); } scmi_pd_data->domains = domains; scmi_pd_data->num_domains = num_domains; of_genpd_add_provider_onecell(np, scmi_pd_data); return 0; } static const struct scmi_device_id scmi_id_table[] = { { SCMI_PROTOCOL_POWER }, { }, }; MODULE_DEVICE_TABLE(scmi, scmi_id_table); static struct scmi_driver scmi_power_domain_driver = { .name = "scmi-power-domain", .probe = scmi_pm_domain_probe, .id_table = scmi_id_table, }; module_scmi_driver(scmi_power_domain_driver); MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>"); MODULE_DESCRIPTION("ARM SCMI power domain driver"); MODULE_LICENSE("GPL v2");