mirror of https://gitee.com/openkylin/linux.git
130 lines
3.1 KiB
C
130 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* SCMI Generic power domain support.
|
|
*
|
|
* Copyright (C) 2018 ARM Ltd.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/module.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 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;
|
|
|
|
if (!handle || !handle->power_ops)
|
|
return -ENODEV;
|
|
|
|
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++) {
|
|
u32 state;
|
|
|
|
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;
|
|
|
|
if (handle->power_ops->state_get(handle, i, &state)) {
|
|
dev_warn(dev, "failed to get state for domain %d\n", i);
|
|
continue;
|
|
}
|
|
|
|
pm_genpd_init(&scmi_pd->genpd, NULL,
|
|
state == SCMI_POWER_STATE_GENERIC_OFF);
|
|
}
|
|
|
|
scmi_pd_data->domains = domains;
|
|
scmi_pd_data->num_domains = num_domains;
|
|
|
|
of_genpd_add_provider_onecell(np, scmi_pd_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct scmi_device_id scmi_id_table[] = {
|
|
{ SCMI_PROTOCOL_POWER },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(scmi, scmi_id_table);
|
|
|
|
static struct scmi_driver scmi_power_domain_driver = {
|
|
.name = "scmi-power-domain",
|
|
.probe = scmi_pm_domain_probe,
|
|
.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");
|