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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2016, NVIDIA CORPORATION.
*/
#define LOG_CATEGORY UCLASS_POWER_DOMAIN
#include <dm.h>
#include <log.h>
#include <malloc.h>
#include <power-domain.h>
#include <power-domain-uclass.h>
#include <dm/device-internal.h>
struct power_domain_priv {
int *on_count;
};
static inline struct power_domain_ops *power_domain_dev_ops(struct udevice *dev)
{
return (struct power_domain_ops *)dev->driver->ops;
}
static int power_domain_of_xlate_default(struct power_domain *power_domain,
struct ofnode_phandle_args *args)
{
debug("%s(power_domain=%p)\n", __func__, power_domain);
if (args->args_count != 1) {
debug("Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
power_domain->id = args->args[0];
return 0;
}
int power_domain_get_by_index(struct udevice *dev,
struct power_domain *power_domain, int index)
{
struct ofnode_phandle_args args;
int ret;
struct udevice *dev_power_domain;
struct power_domain_ops *ops;
debug("%s(dev=%p, power_domain=%p)\n", __func__, dev, power_domain);
ret = dev_read_phandle_with_args(dev, "power-domains",
"#power-domain-cells", 0, index,
&args);
if (ret) {
debug("%s: dev_read_phandle_with_args failed: %d\n",
__func__, ret);
return ret;
}
ret = uclass_get_device_by_ofnode(UCLASS_POWER_DOMAIN, args.node,
&dev_power_domain);
if (ret) {
debug("%s: uclass_get_device_by_ofnode failed: %d\n",
__func__, ret);
return ret;
}
ops = power_domain_dev_ops(dev_power_domain);
power_domain->dev = dev_power_domain;
if (ops->of_xlate)
ret = ops->of_xlate(power_domain, &args);
else
ret = power_domain_of_xlate_default(power_domain, &args);
if (ret) {
debug("of_xlate() failed: %d\n", ret);
return ret;
}
ret = ops->request ? ops->request(power_domain) : 0;
if (ret) {
debug("ops->request() failed: %d\n", ret);
return ret;
}
return 0;
}
int power_domain_get_by_name(struct udevice *dev,
struct power_domain *power_domain, const char *name)
{
int index;
index = dev_read_stringlist_search(dev, "power-domain-names", name);
if (index < 0) {
debug("fdt_stringlist_search() failed: %d\n", index);
return index;
}
return power_domain_get_by_index(dev, power_domain, index);
}
int power_domain_get(struct udevice *dev, struct power_domain *power_domain)
{
return power_domain_get_by_index(dev, power_domain, 0);
}
int power_domain_free(struct power_domain *power_domain)
{
struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
debug("%s(power_domain=%p)\n", __func__, power_domain);
return ops->rfree ? ops->rfree(power_domain) : 0;
}
int power_domain_on_lowlevel(struct power_domain *power_domain)
{
struct power_domain_priv *priv = dev_get_uclass_priv(power_domain->dev);
struct power_domain_plat *plat = dev_get_uclass_plat(power_domain->dev);
struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
int *on_count = plat->subdomains ? &priv->on_count[power_domain->id] : NULL;
int ret;
/* Refcounting is not enabled on all drivers by default */
if (on_count) {
debug("Enable power domain %s.%ld: %d -> %d (%s)\n",
power_domain->dev->name, power_domain->id, *on_count, *on_count + 1,
(((*on_count + 1) > 1) ? "EALREADY" : "todo"));
(*on_count)++;
if (*on_count > 1)
return -EALREADY;
}
ret = ops->on ? ops->on(power_domain) : 0;
if (ret) {
if (on_count)
(*on_count)--;
return ret;
}
return 0;
}
int power_domain_off_lowlevel(struct power_domain *power_domain)
{
struct power_domain_priv *priv = dev_get_uclass_priv(power_domain->dev);
struct power_domain_plat *plat = dev_get_uclass_plat(power_domain->dev);
struct power_domain_ops *ops = power_domain_dev_ops(power_domain->dev);
int *on_count = plat->subdomains ? &priv->on_count[power_domain->id] : NULL;
int ret;
/* Refcounting is not enabled on all drivers by default */
if (on_count) {
debug("Disable power domain %s.%ld: %d -> %d (%s%s)\n",
power_domain->dev->name, power_domain->id, *on_count, *on_count - 1,
(((*on_count) <= 0) ? "EALREADY" : ""),
(((*on_count - 1) > 0) ? "BUSY" : "todo"));
if (*on_count <= 0)
return -EALREADY;
(*on_count)--;
if (*on_count > 0)
return -EBUSY;
}
ret = ops->off ? ops->off(power_domain) : 0;
if (ret) {
if (on_count)
(*on_count)++;
return ret;
}
return 0;
}
#if CONFIG_IS_ENABLED(OF_REAL)
static int dev_power_domain_ctrl(struct udevice *dev, bool on)
{
struct power_domain pd;
int i, count, ret = 0;
count = dev_count_phandle_with_args(dev, "power-domains",
"#power-domain-cells", 0);
for (i = 0; i < count; i++) {
ret = power_domain_get_by_index(dev, &pd, i);
if (ret)
return ret;
if (on)
ret = power_domain_on(&pd);
else
ret = power_domain_off(&pd);
}
/*
* For platforms with parent and child power-domain devices
* we may not run device_remove() on the power-domain parent
* because it will result in removing its children and switching
* off their power-domain parent. So we will get here again and
* again and will be stuck in an endless loop.
*/
if (count > 0 && !on && dev_get_parent(dev) == pd.dev &&
device_get_uclass_id(dev) == UCLASS_POWER_DOMAIN)
return ret;
/*
* power_domain_get() bound the device, thus
* we must remove it again to prevent unbinding
* active devices (which would result in unbind
* error).
*/
if (count > 0 && !on)
device_remove(pd.dev, DM_REMOVE_NORMAL);
return ret;
}
int dev_power_domain_on(struct udevice *dev)
{
return dev_power_domain_ctrl(dev, true);
}
int dev_power_domain_off(struct udevice *dev)
{
return dev_power_domain_ctrl(dev, false);
}
#endif /* OF_REAL */
static int power_domain_post_probe(struct udevice *dev)
{
struct power_domain_priv *priv = dev_get_uclass_priv(dev);
struct power_domain_plat *plat = dev_get_uclass_plat(dev);
if (plat->subdomains) {
priv->on_count = calloc(sizeof(int), plat->subdomains);
if (!priv->on_count)
return -ENOMEM;
}
return 0;
}
static int power_domain_pre_remove(struct udevice *dev)
{
struct power_domain_priv *priv = dev_get_uclass_priv(dev);
struct power_domain_plat *plat = dev_get_uclass_plat(dev);
if (plat->subdomains)
free(priv->on_count);
return 0;
}
UCLASS_DRIVER(power_domain) = {
.id = UCLASS_POWER_DOMAIN,
.name = "power_domain",
.post_probe = power_domain_post_probe,
.pre_remove = power_domain_pre_remove,
.per_device_auto = sizeof(struct power_domain_priv),
.per_device_plat_auto = sizeof(struct power_domain_plat),
};
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