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// SPDX-License-Identifier: GPL-2.0
/*
* SCMI performance domain support.
*
* Copyright (C) 2023 Linaro Ltd.
*/
#include <linux/err.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/pm_domain.h>
#include <linux/pm_opp.h>
#include <linux/scmi_protocol.h>
#include <linux/slab.h>
struct scmi_perf_domain {
struct generic_pm_domain genpd;
const struct scmi_perf_proto_ops *perf_ops;
const struct scmi_protocol_handle *ph;
const struct scmi_perf_domain_info *info;
u32 domain_id;
};
#define to_scmi_pd(pd) container_of(pd, struct scmi_perf_domain, genpd)
static int
scmi_pd_set_perf_state(struct generic_pm_domain *genpd, unsigned int state)
{
struct scmi_perf_domain *pd = to_scmi_pd(genpd);
int ret;
if (!pd->info->set_perf)
return 0;
if (!state)
return -EINVAL;
ret = pd->perf_ops->level_set(pd->ph, pd->domain_id, state, false);
if (ret)
dev_warn(&genpd->dev, "Failed with %d when trying to set %d perf level",
ret, state);
return ret;
}
static int
scmi_pd_attach_dev(struct generic_pm_domain *genpd, struct device *dev)
{
struct scmi_perf_domain *pd = to_scmi_pd(genpd);
int ret;
/*
* Allow the device to be attached, but don't add the OPP table unless
* the performance level can be changed.
*/
if (!pd->info->set_perf)
return 0;
ret = pd->perf_ops->device_opps_add(pd->ph, dev, pd->domain_id);
if (ret)
dev_warn(dev, "failed to add OPPs for the device\n");
return ret;
}
static void
scmi_pd_detach_dev(struct generic_pm_domain *genpd, struct device *dev)
{
struct scmi_perf_domain *pd = to_scmi_pd(genpd);
if (!pd->info->set_perf)
return;
dev_pm_opp_remove_all_dynamic(dev);
}
static int scmi_perf_domain_probe(struct scmi_device *sdev)
{
struct device *dev = &sdev->dev;
const struct scmi_handle *handle = sdev->handle;
const struct scmi_perf_proto_ops *perf_ops;
struct scmi_protocol_handle *ph;
struct scmi_perf_domain *scmi_pd;
struct genpd_onecell_data *scmi_pd_data;
struct generic_pm_domain **domains;
int num_domains, i, ret = 0;
if (!handle)
return -ENODEV;
/* The OF node must specify us as a power-domain provider. */
if (!of_find_property(dev->of_node, "#power-domain-cells", NULL))
return 0;
perf_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_PERF, &ph);
if (IS_ERR(perf_ops))
return PTR_ERR(perf_ops);
num_domains = perf_ops->num_domains_get(ph);
if (num_domains < 0) {
dev_warn(dev, "Failed with %d when getting num perf domains\n",
num_domains);
return num_domains;
} else if (!num_domains) {
return 0;
}
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++) {
scmi_pd->info = perf_ops->info_get(ph, i);
scmi_pd->domain_id = i;
scmi_pd->perf_ops = perf_ops;
scmi_pd->ph = ph;
scmi_pd->genpd.name = scmi_pd->info->name;
scmi_pd->genpd.flags = GENPD_FLAG_ALWAYS_ON |
GENPD_FLAG_OPP_TABLE_FW;
scmi_pd->genpd.set_performance_state = scmi_pd_set_perf_state;
scmi_pd->genpd.attach_dev = scmi_pd_attach_dev;
scmi_pd->genpd.detach_dev = scmi_pd_detach_dev;
ret = pm_genpd_init(&scmi_pd->genpd, NULL, false);
if (ret)
goto err;
domains[i] = &scmi_pd->genpd;
}
scmi_pd_data->domains = domains;
scmi_pd_data->num_domains = num_domains;
ret = of_genpd_add_provider_onecell(dev->of_node, scmi_pd_data);
if (ret)
goto err;
dev_set_drvdata(dev, scmi_pd_data);
dev_info(dev, "Initialized %d performance domains", num_domains);
return 0;
err:
for (i--; i >= 0; i--)
pm_genpd_remove(domains[i]);
return ret;
}
static void scmi_perf_domain_remove(struct scmi_device *sdev)
{
struct device *dev = &sdev->dev;
struct genpd_onecell_data *scmi_pd_data = dev_get_drvdata(dev);
int i;
if (!scmi_pd_data)
return;
of_genpd_del_provider(dev->of_node);
for (i = 0; i < scmi_pd_data->num_domains; i++)
pm_genpd_remove(scmi_pd_data->domains[i]);
}
static const struct scmi_device_id scmi_id_table[] = {
{ SCMI_PROTOCOL_PERF, "perf" },
{ },
};
MODULE_DEVICE_TABLE(scmi, scmi_id_table);
static struct scmi_driver scmi_perf_domain_driver = {
.name = "scmi-perf-domain",
.probe = scmi_perf_domain_probe,
.remove = scmi_perf_domain_remove,
.id_table = scmi_id_table,
};
module_scmi_driver(scmi_perf_domain_driver);
MODULE_AUTHOR("Ulf Hansson <ulf.hansson@linaro.org>");
MODULE_DESCRIPTION("ARM SCMI perf domain driver");
MODULE_LICENSE("GPL v2");
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