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// SPDX-License-Identifier: GPL-2.0
//
// Exynos Generic power domain support.
//
// Copyright (c) 2012 Samsung Electronics Co., Ltd.
// http://www.samsung.com
//
// Implementation of Exynos specific power domain control which is used in
// conjunction with runtime-pm. Support for both device-tree and non-device-tree
// based power domain support is included.
#include <linux/io.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/pm_domain.h>
#include <linux/delay.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
struct exynos_pm_domain_config {
/* Value for LOCAL_PWR_CFG and STATUS fields for each domain */
u32 local_pwr_cfg;
};
/*
* Exynos specific wrapper around the generic power domain
*/
struct exynos_pm_domain {
void __iomem *base;
bool is_off;
struct generic_pm_domain pd;
u32 local_pwr_cfg;
};
static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
{
struct exynos_pm_domain *pd;
void __iomem *base;
u32 timeout, pwr;
char *op;
pd = container_of(domain, struct exynos_pm_domain, pd);
base = pd->base;
pwr = power_on ? pd->local_pwr_cfg : 0;
writel_relaxed(pwr, base);
/* Wait max 1ms */
timeout = 10;
while ((readl_relaxed(base + 0x4) & pd->local_pwr_cfg) != pwr) {
if (!timeout) {
op = (power_on) ? "enable" : "disable";
pr_err("Power domain %s %s failed\n", domain->name, op);
return -ETIMEDOUT;
}
timeout--;
cpu_relax();
usleep_range(80, 100);
}
return 0;
}
static int exynos_pd_power_on(struct generic_pm_domain *domain)
{
return exynos_pd_power(domain, true);
}
static int exynos_pd_power_off(struct generic_pm_domain *domain)
{
return exynos_pd_power(domain, false);
}
static const struct exynos_pm_domain_config exynos4210_cfg = {
.local_pwr_cfg = 0x7,
};
static const struct exynos_pm_domain_config exynos5433_cfg = {
.local_pwr_cfg = 0xf,
};
static const struct of_device_id exynos_pm_domain_of_match[] = {
{
.compatible = "samsung,exynos4210-pd",
.data = &exynos4210_cfg,
}, {
.compatible = "samsung,exynos5433-pd",
.data = &exynos5433_cfg,
},
{ },
};
static const char *exynos_get_domain_name(struct device_node *node)
{
const char *name;
if (of_property_read_string(node, "label", &name) < 0)
name = kbasename(node->full_name);
return kstrdup_const(name, GFP_KERNEL);
}
static int exynos_pd_probe(struct platform_device *pdev)
{
const struct exynos_pm_domain_config *pm_domain_cfg;
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct of_phandle_args child, parent;
struct exynos_pm_domain *pd;
int on, ret;
pm_domain_cfg = of_device_get_match_data(dev);
pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pd->pd.name = exynos_get_domain_name(np);
if (!pd->pd.name)
return -ENOMEM;
pd->base = of_iomap(np, 0);
if (!pd->base) {
kfree_const(pd->pd.name);
return -ENODEV;
}
pd->pd.power_off = exynos_pd_power_off;
pd->pd.power_on = exynos_pd_power_on;
pd->local_pwr_cfg = pm_domain_cfg->local_pwr_cfg;
on = readl_relaxed(pd->base + 0x4) & pd->local_pwr_cfg;
pm_genpd_init(&pd->pd, NULL, !on);
ret = of_genpd_add_provider_simple(np, &pd->pd);
if (ret == 0 && of_parse_phandle_with_args(np, "power-domains",
"#power-domain-cells", 0, &parent) == 0) {
child.np = np;
child.args_count = 0;
if (of_genpd_add_subdomain(&parent, &child))
pr_warn("%pOF failed to add subdomain: %pOF\n",
parent.np, child.np);
else
pr_info("%pOF has as child subdomain: %pOF.\n",
parent.np, child.np);
}
pm_runtime_enable(dev);
return ret;
}
static struct platform_driver exynos_pd_driver = {
.probe = exynos_pd_probe,
.driver = {
.name = "exynos-pd",
.of_match_table = exynos_pm_domain_of_match,
.suppress_bind_attrs = true,
}
};
static __init int exynos4_pm_init_power_domain(void)
{
return platform_driver_register(&exynos_pd_driver);
}
core_initcall(exynos4_pm_init_power_domain);
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