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// SPDX-License-Identifier: GPL-2.0-only
/*
* TI SCI Generic Power Domain Driver
*
* Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
* J Keerthy <j-keerthy@ti.com>
* Dave Gerlach <d-gerlach@ti.com>
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <dt-bindings/soc/ti,sci_pm_domain.h>
/**
* struct ti_sci_genpd_provider: holds common TI SCI genpd provider data
* @ti_sci: handle to TI SCI protocol driver that provides ops to
* communicate with system control processor.
* @dev: pointer to dev for the driver for devm allocs
* @pd_list: list of all the power domains on the device
* @data: onecell data for genpd core
*/
struct ti_sci_genpd_provider {
const struct ti_sci_handle *ti_sci;
struct device *dev;
struct list_head pd_list;
struct genpd_onecell_data data;
};
/**
* struct ti_sci_pm_domain: TI specific data needed for power domain
* @idx: index of the device that identifies it with the system
* control processor.
* @exclusive: Permissions for exclusive request or shared request of the
* device.
* @pd: generic_pm_domain for use with the genpd framework
* @node: link for the genpd list
* @parent: link to the parent TI SCI genpd provider
*/
struct ti_sci_pm_domain {
int idx;
u8 exclusive;
struct generic_pm_domain pd;
struct list_head node;
struct ti_sci_genpd_provider *parent;
};
#define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd)
/*
* ti_sci_pd_power_off(): genpd power down hook
* @domain: pointer to the powerdomain to power off
*/
static int ti_sci_pd_power_off(struct generic_pm_domain *domain)
{
struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);
const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;
return ti_sci->ops.dev_ops.put_device(ti_sci, pd->idx);
}
/*
* ti_sci_pd_power_on(): genpd power up hook
* @domain: pointer to the powerdomain to power on
*/
static int ti_sci_pd_power_on(struct generic_pm_domain *domain)
{
struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain);
const struct ti_sci_handle *ti_sci = pd->parent->ti_sci;
if (pd->exclusive)
return ti_sci->ops.dev_ops.get_device_exclusive(ti_sci,
pd->idx);
else
return ti_sci->ops.dev_ops.get_device(ti_sci, pd->idx);
}
/*
* ti_sci_pd_xlate(): translation service for TI SCI genpds
* @genpdspec: DT identification data for the genpd
* @data: genpd core data for all the powerdomains on the device
*/
static struct generic_pm_domain *ti_sci_pd_xlate(
struct of_phandle_args *genpdspec,
void *data)
{
struct genpd_onecell_data *genpd_data = data;
unsigned int idx = genpdspec->args[0];
if (genpdspec->args_count != 1 && genpdspec->args_count != 2)
return ERR_PTR(-EINVAL);
if (idx >= genpd_data->num_domains) {
pr_err("%s: invalid domain index %u\n", __func__, idx);
return ERR_PTR(-EINVAL);
}
if (!genpd_data->domains[idx])
return ERR_PTR(-ENOENT);
genpd_to_ti_sci_pd(genpd_data->domains[idx])->exclusive =
genpdspec->args[1];
return genpd_data->domains[idx];
}
static const struct of_device_id ti_sci_pm_domain_matches[] = {
{ .compatible = "ti,sci-pm-domain", },
{ },
};
MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches);
static int ti_sci_pm_domain_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct ti_sci_genpd_provider *pd_provider;
struct ti_sci_pm_domain *pd;
struct device_node *np;
struct of_phandle_args args;
int ret;
u32 max_id = 0;
int index;
pd_provider = devm_kzalloc(dev, sizeof(*pd_provider), GFP_KERNEL);
if (!pd_provider)
return -ENOMEM;
pd_provider->ti_sci = devm_ti_sci_get_handle(dev);
if (IS_ERR(pd_provider->ti_sci))
return PTR_ERR(pd_provider->ti_sci);
pd_provider->dev = dev;
INIT_LIST_HEAD(&pd_provider->pd_list);
/* Find highest device ID used for power domains */
for_each_node_with_property(np, "power-domains") {
index = 0;
while (1) {
ret = of_parse_phandle_with_args(np, "power-domains",
"#power-domain-cells",
index, &args);
if (ret)
break;
if (args.args_count >= 1 && args.np == dev->of_node) {
if (args.args[0] > max_id)
max_id = args.args[0];
pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pd->pd.name = devm_kasprintf(dev, GFP_KERNEL,
"pd:%d",
args.args[0]);
if (!pd->pd.name)
return -ENOMEM;
pd->pd.power_off = ti_sci_pd_power_off;
pd->pd.power_on = ti_sci_pd_power_on;
pd->idx = args.args[0];
pd->parent = pd_provider;
pm_genpd_init(&pd->pd, NULL, true);
list_add(&pd->node, &pd_provider->pd_list);
}
index++;
}
}
pd_provider->data.domains =
devm_kcalloc(dev, max_id + 1,
sizeof(*pd_provider->data.domains),
GFP_KERNEL);
if (!pd_provider->data.domains)
return -ENOMEM;
pd_provider->data.num_domains = max_id + 1;
pd_provider->data.xlate = ti_sci_pd_xlate;
list_for_each_entry(pd, &pd_provider->pd_list, node)
pd_provider->data.domains[pd->idx] = &pd->pd;
return of_genpd_add_provider_onecell(dev->of_node, &pd_provider->data);
}
static struct platform_driver ti_sci_pm_domains_driver = {
.probe = ti_sci_pm_domain_probe,
.driver = {
.name = "ti_sci_pm_domains",
.of_match_table = ti_sci_pm_domain_matches,
},
};
module_platform_driver(ti_sci_pm_domains_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI System Control Interface (SCI) Power Domain driver");
MODULE_AUTHOR("Dave Gerlach");
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