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1// SPDX-License-Identifier: GPL-2.02/*3 * SCMI performance domain support.4 *5 * Copyright (C) 2023 Linaro Ltd.6 */7 8#include <linux/err.h>9#include <linux/device.h>10#include <linux/module.h>11#include <linux/pm_domain.h>12#include <linux/pm_opp.h>13#include <linux/scmi_protocol.h>14#include <linux/slab.h>15 16struct scmi_perf_domain {17 struct generic_pm_domain genpd;18 const struct scmi_perf_proto_ops *perf_ops;19 const struct scmi_protocol_handle *ph;20 const struct scmi_perf_domain_info *info;21 u32 domain_id;22};23 24#define to_scmi_pd(pd) container_of(pd, struct scmi_perf_domain, genpd)25 26static int27scmi_pd_set_perf_state(struct generic_pm_domain *genpd, unsigned int state)28{29 struct scmi_perf_domain *pd = to_scmi_pd(genpd);30 int ret;31 32 if (!pd->info->set_perf)33 return 0;34 35 if (!state)36 return -EINVAL;37 38 ret = pd->perf_ops->level_set(pd->ph, pd->domain_id, state, false);39 if (ret)40 dev_warn(&genpd->dev, "Failed with %d when trying to set %d perf level",41 ret, state);42 43 return ret;44}45 46static int47scmi_pd_attach_dev(struct generic_pm_domain *genpd, struct device *dev)48{49 struct scmi_perf_domain *pd = to_scmi_pd(genpd);50 int ret;51 52 /*53 * Allow the device to be attached, but don't add the OPP table unless54 * the performance level can be changed.55 */56 if (!pd->info->set_perf)57 return 0;58 59 ret = pd->perf_ops->device_opps_add(pd->ph, dev, pd->domain_id);60 if (ret)61 dev_warn(dev, "failed to add OPPs for the device\n");62 63 return ret;64}65 66static void67scmi_pd_detach_dev(struct generic_pm_domain *genpd, struct device *dev)68{69 struct scmi_perf_domain *pd = to_scmi_pd(genpd);70 71 if (!pd->info->set_perf)72 return;73 74 dev_pm_opp_remove_all_dynamic(dev);75}76 77static int scmi_perf_domain_probe(struct scmi_device *sdev)78{79 struct device *dev = &sdev->dev;80 const struct scmi_handle *handle = sdev->handle;81 const struct scmi_perf_proto_ops *perf_ops;82 struct scmi_protocol_handle *ph;83 struct scmi_perf_domain *scmi_pd;84 struct genpd_onecell_data *scmi_pd_data;85 struct generic_pm_domain **domains;86 int num_domains, i, ret = 0;87 88 if (!handle)89 return -ENODEV;90 91 /* The OF node must specify us as a power-domain provider. */92 if (!of_find_property(dev->of_node, "#power-domain-cells", NULL))93 return 0;94 95 perf_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PERF, &ph);96 if (IS_ERR(perf_ops))97 return PTR_ERR(perf_ops);98 99 num_domains = perf_ops->num_domains_get(ph);100 if (num_domains < 0) {101 dev_warn(dev, "Failed with %d when getting num perf domains\n",102 num_domains);103 return num_domains;104 } else if (!num_domains) {105 return 0;106 }107 108 scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL);109 if (!scmi_pd)110 return -ENOMEM;111 112 scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL);113 if (!scmi_pd_data)114 return -ENOMEM;115 116 domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);117 if (!domains)118 return -ENOMEM;119 120 for (i = 0; i < num_domains; i++, scmi_pd++) {121 scmi_pd->info = perf_ops->info_get(ph, i);122 123 scmi_pd->domain_id = i;124 scmi_pd->perf_ops = perf_ops;125 scmi_pd->ph = ph;126 scmi_pd->genpd.name = scmi_pd->info->name;127 scmi_pd->genpd.flags = GENPD_FLAG_ALWAYS_ON |128 GENPD_FLAG_OPP_TABLE_FW |129 GENPD_FLAG_DEV_NAME_FW;130 scmi_pd->genpd.set_performance_state = scmi_pd_set_perf_state;131 scmi_pd->genpd.attach_dev = scmi_pd_attach_dev;132 scmi_pd->genpd.detach_dev = scmi_pd_detach_dev;133 134 ret = pm_genpd_init(&scmi_pd->genpd, NULL, false);135 if (ret)136 goto err;137 138 domains[i] = &scmi_pd->genpd;139 }140 141 scmi_pd_data->domains = domains;142 scmi_pd_data->num_domains = num_domains;143 144 ret = of_genpd_add_provider_onecell(dev->of_node, scmi_pd_data);145 if (ret)146 goto err;147 148 dev_set_drvdata(dev, scmi_pd_data);149 dev_info(dev, "Initialized %d performance domains", num_domains);150 return 0;151err:152 for (i--; i >= 0; i--)153 pm_genpd_remove(domains[i]);154 return ret;155}156 157static void scmi_perf_domain_remove(struct scmi_device *sdev)158{159 struct device *dev = &sdev->dev;160 struct genpd_onecell_data *scmi_pd_data = dev_get_drvdata(dev);161 int i;162 163 if (!scmi_pd_data)164 return;165 166 of_genpd_del_provider(dev->of_node);167 168 for (i = 0; i < scmi_pd_data->num_domains; i++)169 pm_genpd_remove(scmi_pd_data->domains[i]);170}171 172static const struct scmi_device_id scmi_id_table[] = {173 { SCMI_PROTOCOL_PERF, "perf" },174 { },175};176MODULE_DEVICE_TABLE(scmi, scmi_id_table);177 178static struct scmi_driver scmi_perf_domain_driver = {179 .name = "scmi-perf-domain",180 .probe = scmi_perf_domain_probe,181 .remove = scmi_perf_domain_remove,182 .id_table = scmi_id_table,183};184module_scmi_driver(scmi_perf_domain_driver);185 186MODULE_AUTHOR("Ulf Hansson <ulf.hansson@linaro.org>");187MODULE_DESCRIPTION("ARM SCMI perf domain driver");188MODULE_LICENSE("GPL v2");189