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// SPDX-License-Identifier: GPL-2.0
/*
* SCMI Generic power domain support.
*
* Copyright (C) 2018-2021 ARM Ltd.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pm_clock.h>
#include <linux/pm_domain.h>
#include <linux/scmi_protocol.h>
static const struct scmi_power_proto_ops *power_ops;
struct scmi_pm_domain {
struct generic_pm_domain genpd;
const struct scmi_protocol_handle *ph;
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);
if (power_on)
state = SCMI_POWER_STATE_GENERIC_ON;
else
state = SCMI_POWER_STATE_GENERIC_OFF;
ret = power_ops->state_set(pd->ph, pd->domain, state);
if (!ret)
ret = power_ops->state_get(pd->ph, 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_pd_attach_dev(struct generic_pm_domain *pd, struct device *dev)
{
int ret;
ret = pm_clk_create(dev);
if (ret)
return ret;
ret = of_pm_clk_add_clks(dev);
if (ret >= 0)
return 0;
pm_clk_destroy(dev);
return ret;
}
static void scmi_pd_detach_dev(struct generic_pm_domain *pd, struct device *dev)
{
pm_clk_destroy(dev);
}
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;
struct scmi_protocol_handle *ph;
if (!handle)
return -ENODEV;
power_ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_POWER, &ph);
if (IS_ERR(power_ops))
return PTR_ERR(power_ops);
num_domains = power_ops->num_domains_get(ph);
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 (power_ops->state_get(ph, i, &state)) {
dev_warn(dev, "failed to get state for domain %d\n", i);
continue;
}
scmi_pd->domain = i;
scmi_pd->ph = ph;
scmi_pd->name = power_ops->name_get(ph, 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;
scmi_pd->genpd.attach_dev = scmi_pd_attach_dev;
scmi_pd->genpd.detach_dev = scmi_pd_detach_dev;
scmi_pd->genpd.flags = GENPD_FLAG_PM_CLK |
GENPD_FLAG_ACTIVE_WAKEUP;
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;
dev_set_drvdata(dev, scmi_pd_data);
return of_genpd_add_provider_onecell(np, scmi_pd_data);
}
static void scmi_pm_domain_remove(struct scmi_device *sdev)
{
int i;
struct genpd_onecell_data *scmi_pd_data;
struct device *dev = &sdev->dev;
struct device_node *np = dev->of_node;
of_genpd_del_provider(np);
scmi_pd_data = dev_get_drvdata(dev);
for (i = 0; i < scmi_pd_data->num_domains; i++) {
if (!scmi_pd_data->domains[i])
continue;
pm_genpd_remove(scmi_pd_data->domains[i]);
}
}
static const struct scmi_device_id scmi_id_table[] = {
{ SCMI_PROTOCOL_POWER, "genpd" },
{ },
};
MODULE_DEVICE_TABLE(scmi, scmi_id_table);
static struct scmi_driver scmi_power_domain_driver = {
.name = "scmi-power-domain",
.probe = scmi_pm_domain_probe,
.remove = scmi_pm_domain_remove,
.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");
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