| // 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; |
| |
| if (handle->power_ops->state_get(handle, i, &state)) { |
| dev_warn(dev, "failed to get state for domain %d\n", i); |
| continue; |
| } |
| |
| 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; |
| |
| pm_genpd_init(&scmi_pd->genpd, NULL, |
| state == SCMI_POWER_STATE_GENERIC_OFF); |
| |
| domains[i] = &scmi_pd->genpd; |
| } |
| |
| 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"); |