155 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * SCMI Generic power domain support.4 *5 * Copyright (C) 2018-2021 ARM Ltd.6 */7 8#include <linux/err.h>9#include <linux/io.h>10#include <linux/module.h>11#include <linux/pm_domain.h>12#include <linux/scmi_protocol.h>13 14static const struct scmi_power_proto_ops *power_ops;15 16struct scmi_pm_domain {17 struct generic_pm_domain genpd;18 const struct scmi_protocol_handle *ph;19 const char *name;20 u32 domain;21};22 23#define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd)24 25static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on)26{27 int ret;28 u32 state, ret_state;29 struct scmi_pm_domain *pd = to_scmi_pd(domain);30 31 if (power_on)32 state = SCMI_POWER_STATE_GENERIC_ON;33 else34 state = SCMI_POWER_STATE_GENERIC_OFF;35 36 ret = power_ops->state_set(pd->ph, pd->domain, state);37 if (!ret)38 ret = power_ops->state_get(pd->ph, pd->domain, &ret_state);39 if (!ret && state != ret_state)40 return -EIO;41 42 return ret;43}44 45static int scmi_pd_power_on(struct generic_pm_domain *domain)46{47 return scmi_pd_power(domain, true);48}49 50static int scmi_pd_power_off(struct generic_pm_domain *domain)51{52 return scmi_pd_power(domain, false);53}54 55static int scmi_pm_domain_probe(struct scmi_device *sdev)56{57 int num_domains, i;58 struct device *dev = &sdev->dev;59 struct device_node *np = dev->of_node;60 struct scmi_pm_domain *scmi_pd;61 struct genpd_onecell_data *scmi_pd_data;62 struct generic_pm_domain **domains;63 const struct scmi_handle *handle = sdev->handle;64 struct scmi_protocol_handle *ph;65 66 if (!handle)67 return -ENODEV;68 69 power_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_POWER, &ph);70 if (IS_ERR(power_ops))71 return PTR_ERR(power_ops);72 73 num_domains = power_ops->num_domains_get(ph);74 if (num_domains < 0) {75 dev_err(dev, "number of domains not found\n");76 return num_domains;77 }78 79 scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL);80 if (!scmi_pd)81 return -ENOMEM;82 83 scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL);84 if (!scmi_pd_data)85 return -ENOMEM;86 87 domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);88 if (!domains)89 return -ENOMEM;90 91 for (i = 0; i < num_domains; i++, scmi_pd++) {92 u32 state;93 94 if (power_ops->state_get(ph, i, &state)) {95 dev_warn(dev, "failed to get state for domain %d\n", i);96 continue;97 }98 99 scmi_pd->domain = i;100 scmi_pd->ph = ph;101 scmi_pd->name = power_ops->name_get(ph, i);102 scmi_pd->genpd.name = scmi_pd->name;103 scmi_pd->genpd.power_off = scmi_pd_power_off;104 scmi_pd->genpd.power_on = scmi_pd_power_on;105 scmi_pd->genpd.flags = GENPD_FLAG_ACTIVE_WAKEUP;106 107 pm_genpd_init(&scmi_pd->genpd, NULL,108 state == SCMI_POWER_STATE_GENERIC_OFF);109 110 domains[i] = &scmi_pd->genpd;111 }112 113 scmi_pd_data->domains = domains;114 scmi_pd_data->num_domains = num_domains;115 116 dev_set_drvdata(dev, scmi_pd_data);117 118 return of_genpd_add_provider_onecell(np, scmi_pd_data);119}120 121static void scmi_pm_domain_remove(struct scmi_device *sdev)122{123 int i;124 struct genpd_onecell_data *scmi_pd_data;125 struct device *dev = &sdev->dev;126 struct device_node *np = dev->of_node;127 128 of_genpd_del_provider(np);129 130 scmi_pd_data = dev_get_drvdata(dev);131 for (i = 0; i < scmi_pd_data->num_domains; i++) {132 if (!scmi_pd_data->domains[i])133 continue;134 pm_genpd_remove(scmi_pd_data->domains[i]);135 }136}137 138static const struct scmi_device_id scmi_id_table[] = {139 { SCMI_PROTOCOL_POWER, "genpd" },140 { },141};142MODULE_DEVICE_TABLE(scmi, scmi_id_table);143 144static struct scmi_driver scmi_power_domain_driver = {145 .name = "scmi-power-domain",146 .probe = scmi_pm_domain_probe,147 .remove = scmi_pm_domain_remove,148 .id_table = scmi_id_table,149};150module_scmi_driver(scmi_power_domain_driver);151 152MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");153MODULE_DESCRIPTION("ARM SCMI power domain driver");154MODULE_LICENSE("GPL v2");155