154 lines
3.7 KiB
C
154 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SCMI Generic power domain support.
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*
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* Copyright (C) 2018-2021 ARM Ltd.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/pm_domain.h>
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#include <linux/scmi_protocol.h>
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static const struct scmi_power_proto_ops *power_ops;
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struct scmi_pm_domain {
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struct generic_pm_domain genpd;
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const struct scmi_protocol_handle *ph;
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const char *name;
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u32 domain;
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};
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#define to_scmi_pd(gpd) container_of(gpd, struct scmi_pm_domain, genpd)
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static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on)
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{
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int ret;
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u32 state, ret_state;
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struct scmi_pm_domain *pd = to_scmi_pd(domain);
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if (power_on)
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state = SCMI_POWER_STATE_GENERIC_ON;
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else
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state = SCMI_POWER_STATE_GENERIC_OFF;
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ret = power_ops->state_set(pd->ph, pd->domain, state);
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if (!ret)
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ret = power_ops->state_get(pd->ph, pd->domain, &ret_state);
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if (!ret && state != ret_state)
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return -EIO;
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return ret;
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}
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static int scmi_pd_power_on(struct generic_pm_domain *domain)
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{
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return scmi_pd_power(domain, true);
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}
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static int scmi_pd_power_off(struct generic_pm_domain *domain)
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{
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return scmi_pd_power(domain, false);
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}
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static int scmi_pm_domain_probe(struct scmi_device *sdev)
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{
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int num_domains, i;
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struct device *dev = &sdev->dev;
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struct device_node *np = dev->of_node;
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struct scmi_pm_domain *scmi_pd;
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struct genpd_onecell_data *scmi_pd_data;
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struct generic_pm_domain **domains;
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const struct scmi_handle *handle = sdev->handle;
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struct scmi_protocol_handle *ph;
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if (!handle)
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return -ENODEV;
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power_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_POWER, &ph);
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if (IS_ERR(power_ops))
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return PTR_ERR(power_ops);
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num_domains = power_ops->num_domains_get(ph);
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if (num_domains < 0) {
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dev_err(dev, "number of domains not found\n");
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return num_domains;
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}
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scmi_pd = devm_kcalloc(dev, num_domains, sizeof(*scmi_pd), GFP_KERNEL);
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if (!scmi_pd)
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return -ENOMEM;
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scmi_pd_data = devm_kzalloc(dev, sizeof(*scmi_pd_data), GFP_KERNEL);
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if (!scmi_pd_data)
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return -ENOMEM;
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domains = devm_kcalloc(dev, num_domains, sizeof(*domains), GFP_KERNEL);
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if (!domains)
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return -ENOMEM;
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for (i = 0; i < num_domains; i++, scmi_pd++) {
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u32 state;
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if (power_ops->state_get(ph, i, &state)) {
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dev_warn(dev, "failed to get state for domain %d\n", i);
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continue;
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}
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scmi_pd->domain = i;
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scmi_pd->ph = ph;
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scmi_pd->name = power_ops->name_get(ph, i);
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scmi_pd->genpd.name = scmi_pd->name;
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scmi_pd->genpd.power_off = scmi_pd_power_off;
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scmi_pd->genpd.power_on = scmi_pd_power_on;
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pm_genpd_init(&scmi_pd->genpd, NULL,
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state == SCMI_POWER_STATE_GENERIC_OFF);
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domains[i] = &scmi_pd->genpd;
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}
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scmi_pd_data->domains = domains;
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scmi_pd_data->num_domains = num_domains;
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dev_set_drvdata(dev, scmi_pd_data);
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return of_genpd_add_provider_onecell(np, scmi_pd_data);
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}
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static void scmi_pm_domain_remove(struct scmi_device *sdev)
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{
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int i;
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struct genpd_onecell_data *scmi_pd_data;
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struct device *dev = &sdev->dev;
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struct device_node *np = dev->of_node;
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of_genpd_del_provider(np);
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scmi_pd_data = dev_get_drvdata(dev);
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for (i = 0; i < scmi_pd_data->num_domains; i++) {
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if (!scmi_pd_data->domains[i])
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continue;
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pm_genpd_remove(scmi_pd_data->domains[i]);
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}
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}
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static const struct scmi_device_id scmi_id_table[] = {
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{ SCMI_PROTOCOL_POWER, "genpd" },
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{ },
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};
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MODULE_DEVICE_TABLE(scmi, scmi_id_table);
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static struct scmi_driver scmi_power_domain_driver = {
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.name = "scmi-power-domain",
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.probe = scmi_pm_domain_probe,
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.remove = scmi_pm_domain_remove,
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.id_table = scmi_id_table,
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};
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module_scmi_driver(scmi_power_domain_driver);
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MODULE_AUTHOR("Sudeep Holla <sudeep.holla@arm.com>");
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MODULE_DESCRIPTION("ARM SCMI power domain driver");
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MODULE_LICENSE("GPL v2");
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