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/*
* SCMI Generic power domain support.
*
* Copyright (C) 2017 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/pm_domain.h>
#include <linux/scmi_protocol.h>
struct scmi_pm_domain {
struct generic_pm_domain genpd;
const struct scmi_handle *handle;
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);
const struct scmi_power_ops *ops = pd->handle->power_ops;
if (power_on)
state = SCMI_POWER_STATE_GENERIC_ON;
else
state = SCMI_POWER_STATE_GENERIC_OFF;
ret = ops->state_set(pd->handle, pd->domain, state);
if (!ret)
ret = ops->state_get(pd->handle, 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_pm_domain_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->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;
int num_domains, i;
const struct scmi_handle *handle = devm_scmi_handle_get(dev);
if (IS_ERR_OR_NULL(handle) || !handle->power_ops)
return -EPROBE_DEFER;
num_domains = handle->power_ops->num_domains_get(handle);
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++) {
domains[i] = &scmi_pd->genpd;
scmi_pd->domain = i;
scmi_pd->handle = handle;
scmi_pd->name = handle->power_ops->name_get(handle, 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;
/*
* Treat all power domains as off at boot.
*
* The SCP firmware itself may have switched on some domains,
* but for reference counting purpose, keep it this way.
*/
pm_genpd_init(&scmi_pd->genpd, NULL, true);
}
scmi_pd_data->domains = domains;
scmi_pd_data->num_domains = num_domains;
of_genpd_add_provider_onecell(np, scmi_pd_data);
return 0;
}
static struct platform_driver scmi_power_domain_driver = {
.driver = {
.name = "scmi-power-domain",
},
.probe = scmi_pm_domain_probe,
};
module_platform_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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