// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic OPP OF helpers
*
* Copyright (C) 2009-2010 Texas Instruments Incorporated.
* Nishanth Menon
* Romit Dasgupta
* Kevin Hilman
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/cpu.h>
#include <linux/errno.h>
#include <linux/device.h>
#include <linux/of.h>
#include <linux/pm_domain.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/energy_model.h>
#include "opp.h"
/* OPP tables with uninitialized required OPPs, protected by opp_table_lock */
static LIST_HEAD(lazy_opp_tables);
/*
* Returns opp descriptor node for a device node, caller must
* do of_node_put().
*/
static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,
int index)
{
/* "operating-points-v2" can be an array for power domain providers */
return of_parse_phandle(np, "operating-points-v2", index);
}
/* Returns opp descriptor node for a device, caller must do of_node_put() */
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
{
return _opp_of_get_opp_desc_node(dev->of_node, 0);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
struct opp_table *_managed_opp(struct device *dev, int index)
{
struct opp_table *opp_table, *managed_table = NULL;
struct device_node *np;
np = _opp_of_get_opp_desc_node(dev->of_node, index);
if (!np)
return NULL;
list_for_each_entry(opp_table, &opp_tables, node) {
if (opp_table->np == np) {
/*
* Multiple devices can point to the same OPP table and
* so will have same node-pointer, np.
*
* But the OPPs will be considered as shared only if the
* OPP table contains a "opp-shared" property.
*/
if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
_get_opp_table_kref(opp_table);
managed_table = opp_table;
}
break;
}
}
of_node_put(np);
return managed_table;
}
/* The caller must call dev_pm_opp_put() after the OPP is used */
static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table,
struct device_node *opp_np)
{
struct dev_pm_opp *opp;
mutex_lock(&opp_table->lock);
list_for_each_entry(opp, &opp_table->opp_list, node) {
if (opp->np == opp_np) {
dev_pm_opp_get(opp);
mutex_unlock(&opp_table->lock);
return opp;
}
}
mutex_unlock(&opp_table->lock);
return NULL;
}
static struct device_node *of_parse_required_opp(struct device_node *np,
int index)
{
return of_parse_phandle(np, "required-opps", index);
}
/* The caller must call dev_pm_opp_put_opp_table() after the table is used */
static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np)
{
struct opp_table *opp_table;
struct device_node *opp_table_np;
opp_table_np = of_get_parent(opp_np);
if (!opp_table_np)
goto err;
/* It is safe to put the node now as all we need now is its address */
of_node_put(opp_table_np);
mutex_lock(&opp_table_lock);
list_for_each_entry(opp_table, &opp_tables, node) {
if (opp_table_np == opp_table->np) {
_get_opp_table_kref(opp_table);
mutex_unlock(&opp_table_lock);
return opp_table;
}
}
mutex_unlock(&opp_table_lock);
err:
return ERR_PTR(-ENODEV);
}
/* Free resources previously acquired by _opp_table_alloc_required_tables() */
static void _opp_table_free_required_tables(struct opp_table *opp_table)
{
struct opp_table **required_opp_tables = opp_table->required_opp_tables;
int i;
if (!required_opp_tables)
return;
for (i = 0; i < opp_table->required_opp_count; i++) {
if (IS_ERR_OR_NULL(required_opp_tables[i]))
continue;
dev_pm_opp_put_opp_table(required_opp_tables[i]);
}
kfree(required_opp_tables);
opp_table->required_opp_count = 0;
opp_table->required_opp_tables = NULL;
mutex_lock(&opp_table_lock);
list_del(&opp_table->lazy);
mutex_unlock(&opp_table_lock);
}
/*
* Populate all devices and opp tables which are part of "required-opps" list.
* Checking only the first OPP node should be enough.
*/
static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
struct device *dev,
struct device_node *opp_np)
{
struct opp_table **required_opp_tables;
struct device_node *required_np, *np;
bool lazy = false;
int count, i, size;
/* Traversing the first OPP node is all we need */
np = of_get_next_available_child(opp_np, NULL);
if (!np) {
dev_warn(dev, "Empty OPP table\n");
return;
}
count = of_count_phandle_with_args(np, "required-opps", NULL);
if (count <= 0)
goto put_np;
size = sizeof(*required_opp_tables) + sizeof(*opp_table->required_devs);
required_opp_tables = kcalloc(count, size, GFP_KERNEL);
if (!required_opp_tables)
goto put_np;
opp_table->required_opp_tables = required_opp_tables;
opp_table->required_devs = (void *)(required_opp_tables + count);
opp_table->required_opp_count = count;
for (i = 0; i < count; i++) {
required_np = of_parse_required_opp(np, i);
if (!required_np)
goto free_required_tables;
required_opp_tables[i] = _find_table_of_opp_np(required_np);
of_node_put(required_np);
if (IS_ERR(required_opp_tables[i]))
lazy = true;
}
/* Let's do the linking later on */
if (lazy) {
/*
* The OPP table is not held while allocating the table, take it
* now to avoid corruption to the lazy_opp_tables list.
*/
mutex_lock(&opp_table_lock);
list_add(&opp_table->lazy, &lazy_opp_tables);
mutex_unlock(&opp_table_lock);
}
goto put_np;
free_required_tables:
_opp_table_free_required_tables(opp_table);
put_np:
of_node_put(np);
}
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
int index)
{
struct device_node *np, *opp_np;
u32 val;
/*
* Only required for backward compatibility with v1 bindings, but isn't
* harmful for other cases. And so we do it unconditionally.
*/
np = of_node_get(dev->of_node);
if (!np)
return;
if (!of_property_read_u32(np, "clock-latency", &val))
opp_table->clock_latency_ns_max = val;
of_property_read_u32(np, "voltage-tolerance",
&opp_table->voltage_tolerance_v1);
if (of_property_present(np, "#power-domain-cells"))
opp_table->is_genpd = true;
/* Get OPP table node */
opp_np = _opp_of_get_opp_desc_node(np, index);
of_node_put(np);
if (!opp_np)
return;
if (of_property_read_bool(opp_np, "opp-shared"))
opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
else
opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
opp_table->np = opp_np;
_opp_table_alloc_required_tables(opp_table, dev, opp_np);
}
void _of_clear_opp_table(struct opp_table *opp_table)
{
_opp_table_free_required_tables(opp_table);
of_node_put(opp_table->np);
}
/*
* Release all resources previously acquired with a call to
* _of_opp_alloc_required_opps().
*/
static void _of_opp_free_required_opps(struct opp_table *opp_table,
struct dev_pm_opp *opp)
{
struct dev_pm_opp **required_opps = opp->required_opps;
int i;
if (!required_opps)
return;
for (i = 0; i < opp_table->required_opp_count; i++) {
if (!required_opps[i])
continue;
/* Put the reference back */
dev_pm_opp_put(required_opps[i]);
}
opp->required_opps = NULL;
kfree(required_opps);
}
void _of_clear_opp(struct opp_table *opp_table, struct dev_pm_opp *opp)
{
_of_opp_free_required_opps(opp_table, opp);
of_node_put(opp->np);
}
static int _link_required_opps(struct dev_pm_opp *opp, struct opp_table *opp_table,
struct opp_table *required_table, int index)
{
struct device_node *np;
np = of_parse_required_opp(opp->np, index);
if (unlikely(!np))
return -ENODEV;
opp->required_opps[index] = _find_opp_of_np(required_table, np);
of_node_put(np);
if (!opp->required_opps[index]) {
pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
__func__, opp->np, index);
return -ENODEV;
}
/*
* There are two genpd (as required-opp) cases that we need to handle,
* devices with a single genpd and ones with multiple genpds.
*
* The single genpd case requires special handling as we need to use the
* same `dev` structure (instead of a virtual one provided by genpd
* core) for setting the performance state.
*
* It doesn't make sense for a device's DT entry to have both
* "opp-level" and single "required-opps" entry pointing to a genpd's
* OPP, as that would make the OPP core call
* dev_pm_domain_set_performance_state() for two different values for
* the same device structure. Lets treat single genpd configuration as a
* case where the OPP's level is directly available without required-opp
* link in the DT.
*
* Just update the `level` with the right value, which
* dev_pm_opp_set_opp() will take care of in the normal path itself.
*
* There is another case though, where a genpd's OPP table has
* required-opps set to a parent genpd. The OPP core expects the user to
* set the respective required `struct device` pointer via
* dev_pm_opp_set_config().
*/
if (required_table->is_genpd && opp_table->required_opp_count == 1 &&
!opp_table->required_devs[0]) {
/* Genpd core takes care of propagation to parent genpd */
if (!opp_table->is_genpd) {
if (!WARN_ON(opp->level != OPP_LEVEL_UNSET))
opp->level = opp->required_opps[0]->level;
}
}
return 0;
}
/* Populate all required OPPs which are part of "required-opps" list */
static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
struct dev_pm_opp *opp)
{
struct opp_table *required_table;
int i, ret, count = opp_table->required_opp_count;
if (!count)
return 0;
opp->required_opps = kcalloc(count, sizeof(*opp->required_opps), GFP_KERNEL);
if (!opp->required_opps)
return -ENOMEM;
for (i = 0; i < count; i++) {
required_table = opp_table->required_opp_tables[i];
/* Required table not added yet, we will link later */
if (IS_ERR_OR_NULL(required_table))
continue;
ret = _link_required_opps(opp, opp_table, required_table, i);
if (ret)
goto free_required_opps;
}
return 0;
free_required_opps:
_of_opp_free_required_opps(opp_table, opp);
return ret;
}
/* Link required OPPs for an individual OPP */
static int lazy_link_required_opps(struct opp_table *opp_table,
struct opp_table *new_table, int index)
{
struct dev_pm_opp *opp;
int ret;
list_for_each_entry(opp, &opp_table->opp_list, node) {
ret = _link_required_opps(opp, opp_table, new_table, index);
if (ret)
return ret;
}
return 0;
}
/* Link required OPPs for all OPPs of the newly added OPP table */
static void lazy_link_required_opp_table(struct opp_table *new_table)
{
struct opp_table *opp_table, *temp, **required_opp_tables;
struct device_node *required_np, *opp_np, *required_table_np;
struct dev_pm_opp *opp;
int i, ret;
mutex_lock(&opp_table_lock);
list_for_each_entry_safe(opp_table, temp, &lazy_opp_tables, lazy) {
bool lazy = false;
/* opp_np can't be invalid here */
opp_np = of_get_next_available_child(opp_table->np, NULL);
for (i = 0; i < opp_table->required_opp_count; i++) {
required_opp_tables = opp_table->required_opp_tables;
/* Required opp-table is already parsed */
if (!IS_ERR(required_opp_tables[i]))
continue;
/* required_np can't be invalid here */
required_np = of_parse_required_opp(opp_np, i);
required_table_np = of_get_parent(required_np);
of_node_put(required_table_np);
of_node_put(required_np);
/*
* Newly added table isn't the required opp-table for
* opp_table.
*/
if (required_table_np != new_table->np) {
lazy = true;
continue;
}
required_opp_tables[i] = new_table;
_get_opp_table_kref(new_table);
/* Link OPPs now */
ret = lazy_link_required_opps(opp_table, new_table, i);
if (ret) {
/* The OPPs will be marked unusable */
lazy = false;
break;
}
}
of_node_put(opp_np);
/* All required opp-tables found, remove from lazy list */
if (!lazy) {
list_del_init(&opp_table->lazy);
list_for_each_entry(opp, &opp_table->opp_list, node)
_required_opps_available(opp, opp_table->required_opp_count);
}
}
mutex_unlock(&opp_table_lock);
}
static int _bandwidth_supported(struct device *dev, struct opp_table *opp_table)
{
struct device_node *np, *opp_np;
struct property *prop;
if (!opp_table) {
np = of_node_get(dev->of_node);
if (!np)
return -ENODEV;
opp_np = _opp_of_get_opp_desc_node(np, 0);
of_node_put(np);
} else {
opp_np = of_node_get(opp_table->np);
}
/* Lets not fail in case we are parsing opp-v1 bindings */
if (!opp_np)
return 0;
/* Checking only first OPP is sufficient */
np = of_get_next_available_child(opp_np, NULL);
of_node_put(opp_np);
if (!np) {
dev_err(dev, "OPP table empty\n");
return -EINVAL;
}
prop = of_find_property(np, "opp-peak-kBps", NULL);
of_node_put(np);
if (!prop || !prop->length)
return 0;
return 1;
}
int dev_pm_opp_of_find_icc_paths(struct device *dev,
struct opp_table *opp_table)
{
struct device_node *np;
int ret, i, count, num_paths;
struct icc_path **paths;
ret = _bandwidth_supported(dev, opp_table);
if (ret == -EINVAL)
return 0; /* Empty OPP table is a valid corner-case, let's not fail */
else if (ret <= 0)
return ret;
ret = 0;
np = of_node_get(dev->of_node);
if (!np)
return 0;
count = of_count_phandle_with_args(np, "interconnects",
"#interconnect-cells");
of_node_put(np);
if (count < 0)
return 0;
/* two phandles when #interconnect-cells = <1> */
if (count % 2) {
dev_err(dev, "%s: Invalid interconnects values\n", __func__);
return -EINVAL;
}
num_paths = count / 2;
paths = kcalloc(num_paths, sizeof(*paths), GFP_KERNEL);
if (!paths)
return -ENOMEM;
for (i = 0; i < num_paths; i++) {
paths[i] = of_icc_get_by_index(dev, i);
if (IS_ERR(paths[i])) {
ret = dev_err_probe(dev, PTR_ERR(paths[i]), "%s: Unable to get path%d\n", __func__, i);
goto err;
}
}
if (opp_table) {
opp_table->paths = paths;
opp_table->path_count = num_paths;
return 0;
}
err:
while (i--)
icc_put(paths[i]);
kfree(paths);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_find_icc_paths);
static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
struct device_node *np)
{
unsigned int levels = opp_table->supported_hw_count;
int count, versions, ret, i, j;
u32 val;
if (!opp_table->supported_hw) {
/*
* In the case that no supported_hw has been set by the
* platform but there is an opp-supported-hw value set for
* an OPP then the OPP should not be enabled as there is
* no way to see if the hardware supports it.
*/
if (of_property_present(np, "opp-supported-hw"))
return false;
else
return true;
}
count = of_property_count_u32_elems(np, "opp-supported-hw");
if (count <= 0 || count % levels) {
dev_err(dev, "%s: Invalid opp-supported-hw property (%d)\n",
__func__, count);
return false;
}
versions = count / levels;
/* All levels in at least one of the versions should match */
for (i = 0; i < versions; i++) {
bool supported = true;
for (j = 0; j < levels; j++) {
ret = of_property_read_u32_index(np, "opp-supported-hw",
i * levels + j, &val);
if (ret) {
dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
__func__, i * levels + j, ret);
return false;
}
/* Check if the level is supported */
if (!(val & opp_table->supported_hw[j])) {
supported = false;
break;
}
}
if (supported)
return true;
}
return false;
}
static u32 *_parse_named_prop(struct dev_pm_opp *opp, struct device *dev,
struct opp_table *opp_table,
const char *prop_type, bool *triplet)
{
struct property *prop = NULL;
char name[NAME_MAX];
int count, ret;
u32 *out;
/* Search for "opp-<prop_type>-<name>" */
if (opp_table->prop_name) {
snprintf(name, sizeof(name), "opp-%s-%s", prop_type,
opp_table->prop_name);
prop = of_find_property(opp->np, name, NULL);
}
if (!prop) {
/* Search for "opp-<prop_type>" */
snprintf(name, sizeof(name), "opp-%s", prop_type);
prop = of_find_property(opp->np, name, NULL);
if (!prop)
return NULL;
}
count = of_property_count_u32_elems(opp->np, name);
if (count < 0) {
dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, name,
count);
return ERR_PTR(count);
}
/*
* Initialize regulator_count, if regulator information isn't provided
* by the platform. Now that one of the properties is available, fix the
* regulator_count to 1.
*/
if (unlikely(opp_table->regulator_count == -1))
opp_table->regulator_count = 1;
if (count != opp_table->regulator_count &&
(!triplet || count != opp_table->regulator_count * 3)) {
dev_err(dev, "%s: Invalid number of elements in %s property (%u) with supplies (%d)\n",
__func__, prop_type, count, opp_table->regulator_count);
return ERR_PTR(-EINVAL);
}
out = kmalloc_array(count, sizeof(*out), GFP_KERNEL);
if (!out)
return ERR_PTR(-EINVAL);
ret = of_property_read_u32_array(opp->np, name, out, count);
if (ret) {
dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
kfree(out);
return ERR_PTR(-EINVAL);
}
if (triplet)
*triplet = count != opp_table->regulator_count;
return out;
}
static u32 *opp_parse_microvolt(struct dev_pm_opp *opp, struct device *dev,
struct opp_table *opp_table, bool *triplet)
{
u32 *microvolt;
microvolt = _parse_named_prop(opp, dev, opp_table, "microvolt", triplet);
if (IS_ERR(microvolt))
return microvolt;
if (!microvolt) {
/*
* Missing property isn't a problem, but an invalid
* entry is. This property isn't optional if regulator
* information is provided. Check only for the first OPP, as
* regulator_count may get initialized after that to a valid
* value.
*/
if (list_empty(&opp_table->opp_list) &&
opp_table->regulator_count > 0) {
dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
__func__);
return ERR_PTR(-EINVAL);
}
}
return microvolt;
}
static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
struct opp_table *opp_table)
{
u32 *microvolt, *microamp, *microwatt;
int ret = 0, i, j;
bool triplet;
microvolt = opp_parse_microvolt(opp, dev, opp_table, &triplet);
if (IS_ERR(microvolt))
return PTR_ERR(microvolt);
microamp = _parse_named_prop(opp, dev, opp_table, "microamp", NULL);
if (IS_ERR(microamp)) {
ret = PTR_ERR(microamp);
goto free_microvolt;
}
microwatt = _parse_named_prop(opp, dev, opp_table, "microwatt", NULL);
if (IS_ERR(microwatt)) {
ret = PTR_ERR(microwatt);
goto free_microamp;
}
/*
* Initialize regulator_count if it is uninitialized and no properties
* are found.
*/
if (unlikely(opp_table->regulator_count == -1)) {
opp_table->regulator_count = 0;
return 0;
}
for (i = 0, j = 0; i < opp_table->regulator_count; i++) {
if (microvolt) {
opp->supplies[i].u_volt = microvolt[j++];
if (triplet) {
opp->supplies[i].u_volt_min = microvolt[j++];
opp->supplies[i].u_volt_max = microvolt[j++];
} else {
opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
}
}
if (microamp)
opp->supplies[i].u_amp = microamp[i];
if (microwatt)
opp->supplies[i].u_watt = microwatt[i];
}
kfree(microwatt);
free_microamp:
kfree(microamp);
free_microvolt:
kfree(microvolt);
return ret;
}
/**
* dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
* entries
* @dev: device pointer used to lookup OPP table.
*
* Free OPPs created using static entries present in DT.
*/
void dev_pm_opp_of_remove_table(struct device *dev)
{
dev_pm_opp_remove_table(dev);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
static int _read_rate(struct dev_pm_opp *new_opp, struct opp_table *opp_table,
struct device_node *np)
{
struct property *prop;
int i, count, ret;
u64 *rates;
prop = of_find_property(np, "opp-hz", NULL);
if (!prop)
return -ENODEV;
count = prop->length / sizeof(u64);
if (opp_table->clk_count != count) {
pr_err("%s: Count mismatch between opp-hz and clk_count (%d %d)\n",
__func__, count, opp_table->clk_count);
return -EINVAL;
}
rates = kmalloc_array(count, sizeof(*rates), GFP_KERNEL);
if (!rates)
return -ENOMEM;
ret = of_property_read_u64_array(np, "opp-hz", rates, count);
if (ret) {
pr_err("%s: Error parsing opp-hz: %d\n", __func__, ret);
} else {
/*
* Rate is defined as an unsigned long in clk API, and so
* casting explicitly to its type. Must be fixed once rate is 64
* bit guaranteed in clk API.
*/
for (i = 0; i < count; i++) {
new_opp->rates[i] = (unsigned long)rates[i];
/* This will happen for frequencies > 4.29 GHz */
WARN_ON(new_opp->rates[i] != rates[i]);
}
}
kfree(rates);
return ret;
}
static int _read_bw(struct dev_pm_opp *new_opp, struct opp_table *opp_table,
struct device_node *np, bool peak)
{
const char *name = peak ? "opp-peak-kBps" : "opp-avg-kBps";
struct property *prop;
int i, count, ret;
u32 *bw;
prop = of_find_property(np, name, NULL);
if (!prop)
return -ENODEV;
count = prop->length / sizeof(u32);
if (opp_table->path_count != count) {
pr_err("%s: Mismatch between %s and paths (%d %d)\n",
__func__, name, count, opp_table->path_count);
return -EINVAL;
}
bw = kmalloc_array(count, sizeof(*bw), GFP_KERNEL);
if (!bw)
return -ENOMEM;
ret = of_property_read_u32_array(np, name, bw, count);
if (ret) {
pr_err("%s: Error parsing %s: %d\n", __func__, name, ret);
goto out;
}
for (i = 0; i < count; i++) {
if (peak)
new_opp->bandwidth[i].peak = kBps_to_icc(bw[i]);
else
new_opp->bandwidth[i].avg = kBps_to_icc(bw[i]);
}
out:
kfree(bw);
return ret;
}
static int _read_opp_key(struct dev_pm_opp *new_opp,
struct opp_table *opp_table, struct device_node *np)
{
bool found = false;
int ret;
ret = _read_rate(new_opp, opp_table, np);
if (!ret)
found = true;
else if (ret != -ENODEV)
return ret;
/*
* Bandwidth consists of peak and average (optional) values:
* opp-peak-kBps = <path1_value path2_value>;
* opp-avg-kBps = <path1_value path2_value>;
*/
ret = _read_bw(new_opp, opp_table, np, true);
if (!ret) {
found = true;
ret = _read_bw(new_opp, opp_table, np, false);
}
/* The properties were found but we failed to parse them */
if (ret && ret != -ENODEV)
return ret;
if (!of_property_read_u32(np, "opp-level", &new_opp->level))
found = true;
if (found)
return 0;
return ret;
}
/**
* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
* @opp_table: OPP table
* @dev: device for which we do this operation
* @np: device node
*
* This function adds an opp definition to the opp table and returns status. The
* opp can be controlled using dev_pm_opp_enable/disable functions and may be
* removed by dev_pm_opp_remove.
*
* Return:
* Valid OPP pointer:
* On success
* NULL:
* Duplicate OPPs (both freq and volt are same) and opp->available
* OR if the OPP is not supported by hardware.
* ERR_PTR(-EEXIST):
* Freq are same and volt are different OR
* Duplicate OPPs (both freq and volt are same) and !opp->available
* ERR_PTR(-ENOMEM):
* Memory allocation failure
* ERR_PTR(-EINVAL):
* Failed parsing the OPP node
*/
static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table,
struct device *dev, struct device_node *np)
{
struct dev_pm_opp *new_opp;
u32 val;
int ret;
new_opp = _opp_allocate(opp_table);
if (!new_opp)
return ERR_PTR(-ENOMEM);
ret = _read_opp_key(new_opp, opp_table, np);
if (ret < 0) {
dev_err(dev, "%s: opp key field not found\n", __func__);
goto free_opp;
}
/* Check if the OPP supports hardware's hierarchy of versions or not */
if (!_opp_is_supported(dev, opp_table, np)) {
dev_dbg(dev, "OPP not supported by hardware: %s\n",
of_node_full_name(np));
goto free_opp;
}
new_opp->turbo = of_property_read_bool(np, "turbo-mode");
new_opp->np = of_node_get(np);
new_opp->dynamic = false;
new_opp->available = true;
ret = _of_opp_alloc_required_opps(opp_table, new_opp);
if (ret)
goto free_opp;
if (!of_property_read_u32(np, "clock-latency-ns", &val))
new_opp->clock_latency_ns = val;
ret = opp_parse_supplies(new_opp, dev, opp_table);
if (ret)
goto free_required_opps;
ret = _opp_add(dev, new_opp, opp_table);
if (ret) {
/* Don't return error for duplicate OPPs */
if (ret == -EBUSY)
ret = 0;
goto free_required_opps;
}
/* OPP to select on device suspend */
if (of_property_read_bool(np, "opp-suspend")) {
if (opp_table->suspend_opp) {
/* Pick the OPP with higher rate/bw/level as suspend OPP */
if (_opp_compare_key(opp_table, new_opp, opp_table->suspend_opp) == 1) {
opp_table->suspend_opp->suspend = false;
new_opp->suspend = true;
opp_table->suspend_opp = new_opp;
}
} else {
new_opp->suspend = true;
opp_table->suspend_opp = new_opp;
}
}
if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu level:%u\n",
__func__, new_opp->turbo, new_opp->rates[0],
new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns,
new_opp->level);
/*
* Notify the changes in the availability of the operable
* frequency/voltage list.
*/
blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
return new_opp;
free_required_opps:
_of_opp_free_required_opps(opp_table, new_opp);
free_opp:
_opp_free(new_opp);
return ret ? ERR_PTR(ret) : NULL;
}
/* Initializes OPP tables based on new bindings */
static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table)
{
struct device_node *np;
int ret, count = 0;
struct dev_pm_opp *opp;
/* OPP table is already initialized for the device */
mutex_lock(&opp_table->lock);
if (opp_table->parsed_static_opps) {
opp_table->parsed_static_opps++;
mutex_unlock(&opp_table->lock);
return 0;
}
opp_table->parsed_static_opps = 1;
mutex_unlock(&opp_table->lock);
/* We have opp-table node now, iterate over it and add OPPs */
for_each_available_child_of_node(opp_table->np, np) {
opp = _opp_add_static_v2(opp_table, dev, np);
if (IS_ERR(opp)) {
ret = PTR_ERR(opp);
dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
ret);
of_node_put(np);
goto remove_static_opp;
} else if (opp) {
count++;
}
}
/* There should be one or more OPPs defined */
if (!count) {
dev_err(dev, "%s: no supported OPPs", __func__);
ret = -ENOENT;
goto remove_static_opp;
}
lazy_link_required_opp_table(opp_table);
return 0;
remove_static_opp:
_opp_remove_all_static(opp_table);
return ret;
}
/* Initializes OPP tables based on old-deprecated bindings */
static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table)
{
const struct property *prop;
const __be32 *val;
int nr, ret = 0;
mutex_lock(&opp_table->lock);
if (opp_table->parsed_static_opps) {
opp_table->parsed_static_opps++;
mutex_unlock(&opp_table->lock);
return 0;
}
opp_table->parsed_static_opps = 1;
mutex_unlock(&opp_table->lock);
prop = of_find_property(dev->of_node, "operating-points", NULL);
if (!prop) {
ret = -ENODEV;
goto remove_static_opp;
}
if (!prop->value) {
ret = -ENODATA;
goto remove_static_opp;
}
/*
* Each OPP is a set of tuples consisting of frequency and
* voltage like <freq-kHz vol-uV>.
*/
nr = prop->length / sizeof(u32);
if (nr % 2) {
dev_err(dev, "%s: Invalid OPP table\n", __func__);
ret = -EINVAL;
goto remove_static_opp;
}
val = prop->value;
while (nr) {
unsigned long freq = be32_to_cpup(val++) * 1000;
unsigned long volt = be32_to_cpup(val++);
struct dev_pm_opp_data data = {
.freq = freq,
.u_volt = volt,
};
ret = _opp_add_v1(opp_table, dev, &data, false);
if (ret) {
dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
__func__, data.freq, ret);
goto remove_static_opp;
}
nr -= 2;
}
return 0;
remove_static_opp:
_opp_remove_all_static(opp_table);
return ret;
}
static int _of_add_table_indexed(struct device *dev, int index)
{
struct opp_table *opp_table;
int ret, count;
if (index) {
/*
* If only one phandle is present, then the same OPP table
* applies for all index requests.
*/
count = of_count_phandle_with_args(dev->of_node,
"operating-points-v2", NULL);
if (count == 1)
index = 0;
}
opp_table = _add_opp_table_indexed(dev, index, true);
if (IS_ERR(opp_table))
return PTR_ERR(opp_table);
/*
* OPPs have two version of bindings now. Also try the old (v1)
* bindings for backward compatibility with older dtbs.
*/
if (opp_table->np)
ret = _of_add_opp_table_v2(dev, opp_table);
else
ret = _of_add_opp_table_v1(dev, opp_table);
if (ret)
dev_pm_opp_put_opp_table(opp_table);
return ret;
}
static void devm_pm_opp_of_table_release(void *data)
{
dev_pm_opp_of_remove_table(data);
}
static int _devm_of_add_table_indexed(struct device *dev, int index)
{
int ret;
ret = _of_add_table_indexed(dev, index);
if (ret)
return ret;
return devm_add_action_or_reset(dev, devm_pm_opp_of_table_release, dev);
}
/**
* devm_pm_opp_of_add_table() - Initialize opp table from device tree
* @dev: device pointer used to lookup OPP table.
*
* Register the initial OPP table with the OPP library for given device.
*
* The opp_table structure will be freed after the device is destroyed.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
* -EEXIST Freq are same and volt are different OR
* Duplicate OPPs (both freq and volt are same) and !opp->available
* -ENOMEM Memory allocation failure
* -ENODEV when 'operating-points' property is not found or is invalid data
* in device node.
* -ENODATA when empty 'operating-points' property is found
* -EINVAL when invalid entries are found in opp-v2 table
*/
int devm_pm_opp_of_add_table(struct device *dev)
{
return _devm_of_add_table_indexed(dev, 0);
}
EXPORT_SYMBOL_GPL(devm_pm_opp_of_add_table);
/**
* dev_pm_opp_of_add_table() - Initialize opp table from device tree
* @dev: device pointer used to lookup OPP table.
*
* Register the initial OPP table with the OPP library for given device.
*
* Return:
* 0 On success OR
* Duplicate OPPs (both freq and volt are same) and opp->available
* -EEXIST Freq are same and volt are different OR
* Duplicate OPPs (both freq and volt are same) and !opp->available
* -ENOMEM Memory allocation failure
* -ENODEV when 'operating-points' property is not found or is invalid data
* in device node.
* -ENODATA when empty 'operating-points' property is found
* -EINVAL when invalid entries are found in opp-v2 table
*/
int dev_pm_opp_of_add_table(struct device *dev)
{
return _of_add_table_indexed(dev, 0);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
/**
* dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree
* @dev: device pointer used to lookup OPP table.
* @index: Index number.
*
* Register the initial OPP table with the OPP library for given device only
* using the "operating-points-v2" property.
*
* Return: Refer to dev_pm_opp_of_add_table() for return values.
*/
int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
{
return _of_add_table_indexed(dev, index);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed);
/**
* devm_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree
* @dev: device pointer used to lookup OPP table.
* @index: Index number.
*
* This is a resource-managed variant of dev_pm_opp_of_add_table_indexed().
*/
int devm_pm_opp_of_add_table_indexed(struct device *dev, int index)
{
return _devm_of_add_table_indexed(dev, index);
}
EXPORT_SYMBOL_GPL(devm_pm_opp_of_add_table_indexed);
/* CPU device specific helpers */
/**
* dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask
* @cpumask: cpumask for which OPP table needs to be removed
*
* This removes the OPP tables for CPUs present in the @cpumask.
* This should be used only to remove static entries created from DT.
*/
void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
{
_dev_pm_opp_cpumask_remove_table(cpumask, -1);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
/**
* dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask
* @cpumask: cpumask for which OPP table needs to be added.
*
* This adds the OPP tables for CPUs present in the @cpumask.
*/
int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
{
struct device *cpu_dev;
int cpu, ret;
if (WARN_ON(cpumask_empty(cpumask)))
return -ENODEV;
for_each_cpu(cpu, cpumask) {
cpu_dev = get_cpu_device(cpu);
if (!cpu_dev) {
pr_err("%s: failed to get cpu%d device\n", __func__,
cpu);
ret = -ENODEV;
goto remove_table;
}
ret = dev_pm_opp_of_add_table(cpu_dev);
if (ret) {
/*
* OPP may get registered dynamically, don't print error
* message here.
*/
pr_debug("%s: couldn't find opp table for cpu:%d, %d\n",
__func__, cpu, ret);
goto remove_table;
}
}
return 0;
remove_table:
/* Free all other OPPs */
_dev_pm_opp_cpumask_remove_table(cpumask, cpu);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
/*
* Works only for OPP v2 bindings.
*
* Returns -ENOENT if operating-points-v2 bindings aren't supported.
*/
/**
* dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with
* @cpu_dev using operating-points-v2
* bindings.
*
* @cpu_dev: CPU device for which we do this operation
* @cpumask: cpumask to update with information of sharing CPUs
*
* This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
*
* Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
*/
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
struct cpumask *cpumask)
{
struct device_node *np, *tmp_np, *cpu_np;
int cpu, ret = 0;
/* Get OPP descriptor node */
np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
if (!np) {
dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
return -ENOENT;
}
cpumask_set_cpu(cpu_dev->id, cpumask);
/* OPPs are shared ? */
if (!of_property_read_bool(np, "opp-shared"))
goto put_cpu_node;
for_each_possible_cpu(cpu) {
if (cpu == cpu_dev->id)
continue;
cpu_np = of_cpu_device_node_get(cpu);
if (!cpu_np) {
dev_err(cpu_dev, "%s: failed to get cpu%d node\n",
__func__, cpu);
ret = -ENOENT;
goto put_cpu_node;
}
/* Get OPP descriptor node */
tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0);
of_node_put(cpu_np);
if (!tmp_np) {
pr_err("%pOF: Couldn't find opp node\n", cpu_np);
ret = -ENOENT;
goto put_cpu_node;
}
/* CPUs are sharing opp node */
if (np == tmp_np)
cpumask_set_cpu(cpu, cpumask);
of_node_put(tmp_np);
}
put_cpu_node:
of_node_put(np);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
/**
* of_get_required_opp_performance_state() - Search for required OPP and return its performance state.
* @np: Node that contains the "required-opps" property.
* @index: Index of the phandle to parse.
*
* Returns the performance state of the OPP pointed out by the "required-opps"
* property at @index in @np.
*
* Return: Zero or positive performance state on success, otherwise negative
* value on errors.
*/
int of_get_required_opp_performance_state(struct device_node *np, int index)
{
struct dev_pm_opp *opp;
struct device_node *required_np;
struct opp_table *opp_table;
int pstate = -EINVAL;
required_np = of_parse_required_opp(np, index);
if (!required_np)
return -ENODEV;
opp_table = _find_table_of_opp_np(required_np);
if (IS_ERR(opp_table)) {
pr_err("%s: Failed to find required OPP table %pOF: %ld\n",
__func__, np, PTR_ERR(opp_table));
goto put_required_np;
}
/* The OPP tables must belong to a genpd */
if (unlikely(!opp_table->is_genpd)) {
pr_err("%s: Performance state is only valid for genpds.\n", __func__);
goto put_required_np;
}
opp = _find_opp_of_np(opp_table, required_np);
if (opp) {
if (opp->level == OPP_LEVEL_UNSET) {
pr_err("%s: OPP levels aren't available for %pOF\n",
__func__, np);
} else {
pstate = opp->level;
}
dev_pm_opp_put(opp);
}
dev_pm_opp_put_opp_table(opp_table);
put_required_np:
of_node_put(required_np);
return pstate;
}
EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state);
/**
* dev_pm_opp_of_has_required_opp - Find out if a required-opps exists.
* @dev: The device to investigate.
*
* Returns true if the device's node has a "operating-points-v2" property and if
* the corresponding node for the opp-table describes opp nodes that uses the
* "required-opps" property.
*
* Return: True if a required-opps is present, else false.
*/
bool dev_pm_opp_of_has_required_opp(struct device *dev)
{
struct device_node *opp_np, *np;
int count;
opp_np = _opp_of_get_opp_desc_node(dev->of_node, 0);
if (!opp_np)
return false;
np = of_get_next_available_child(opp_np, NULL);
of_node_put(opp_np);
if (!np) {
dev_warn(dev, "Empty OPP table\n");
return false;
}
count = of_count_phandle_with_args(np, "required-opps", NULL);
of_node_put(np);
return count > 0;
}
/**
* dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp
* @opp: opp for which DT node has to be returned for
*
* Return: DT node corresponding to the opp, else 0 on success.
*
* The caller needs to put the node with of_node_put() after using it.
*/
struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
{
if (IS_ERR_OR_NULL(opp)) {
pr_err("%s: Invalid parameters\n", __func__);
return NULL;
}
return of_node_get(opp->np);
}
EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
/*
* Callback function provided to the Energy Model framework upon registration.
* It provides the power used by @dev at @kHz if it is the frequency of an
* existing OPP, or at the frequency of the first OPP above @kHz otherwise
* (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled
* frequency and @uW to the associated power.
*
* Returns 0 on success or a proper -EINVAL value in case of error.
*/
static int __maybe_unused
_get_dt_power(struct device *dev, unsigned long *uW, unsigned long *kHz)
{
struct dev_pm_opp *opp;
unsigned long opp_freq, opp_power;
/* Find the right frequency and related OPP */
opp_freq = *kHz * 1000;
opp = dev_pm_opp_find_freq_ceil(dev, &opp_freq);
if (IS_ERR(opp))
return -EINVAL;
opp_power = dev_pm_opp_get_power(opp);
dev_pm_opp_put(opp);
if (!opp_power)
return -EINVAL;
*kHz = opp_freq / 1000;
*uW = opp_power;
return 0;
}
/**
* dev_pm_opp_calc_power() - Calculate power value for device with EM
* @dev : Device for which an Energy Model has to be registered
* @uW : New power value that is calculated
* @kHz : Frequency for which the new power is calculated
*
* This computes the power estimated by @dev at @kHz if it is the frequency
* of an existing OPP, or at the frequency of the first OPP above @kHz otherwise
* (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled
* frequency and @uW to the associated power. The power is estimated as
* P = C * V^2 * f with C being the device's capacitance and V and f
* respectively the voltage and frequency of the OPP.
* It is also used as a callback function provided to the Energy Model
* framework upon registration.
*
* Returns -EINVAL if the power calculation failed because of missing
* parameters, 0 otherwise.
*/
int dev_pm_opp_calc_power(struct device *dev, unsigned long *uW,
unsigned long *kHz)
{
struct dev_pm_opp *opp;
struct device_node *np;
unsigned long mV, Hz;
u32 cap;
u64 tmp;
int ret;
np = of_node_get(dev->of_node);
if (!np)
return -EINVAL;
ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
of_node_put(np);
if (ret)
return -EINVAL;
Hz = *kHz * 1000;
opp = dev_pm_opp_find_freq_ceil(dev, &Hz);
if (IS_ERR(opp))
return -EINVAL;
mV = dev_pm_opp_get_voltage(opp) / 1000;
dev_pm_opp_put(opp);
if (!mV)
return -EINVAL;
tmp = (u64)cap * mV * mV * (Hz / 1000000);
/* Provide power in micro-Watts */
do_div(tmp, 1000000);
*uW = (unsigned long)tmp;
*kHz = Hz / 1000;
return 0;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_calc_power);
static bool _of_has_opp_microwatt_property(struct device *dev)
{
unsigned long power, freq = 0;
struct dev_pm_opp *opp;
/* Check if at least one OPP has needed property */
opp = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp))
return false;
power = dev_pm_opp_get_power(opp);
dev_pm_opp_put(opp);
if (!power)
return false;
return true;
}
/**
* dev_pm_opp_of_register_em() - Attempt to register an Energy Model
* @dev : Device for which an Energy Model has to be registered
* @cpus : CPUs for which an Energy Model has to be registered. For
* other type of devices it should be set to NULL.
*
* This checks whether the "dynamic-power-coefficient" devicetree property has
* been specified, and tries to register an Energy Model with it if it has.
* Having this property means the voltages are known for OPPs and the EM
* might be calculated.
*/
int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus)
{
struct em_data_callback em_cb;
struct device_node *np;
int ret, nr_opp;
u32 cap;
if (IS_ERR_OR_NULL(dev)) {
ret = -EINVAL;
goto failed;
}
nr_opp = dev_pm_opp_get_opp_count(dev);
if (nr_opp <= 0) {
ret = -EINVAL;
goto failed;
}
/* First, try to find more precised Energy Model in DT */
if (_of_has_opp_microwatt_property(dev)) {
EM_SET_ACTIVE_POWER_CB(em_cb, _get_dt_power);
goto register_em;
}
np = of_node_get(dev->of_node);
if (!np) {
ret = -EINVAL;
goto failed;
}
/*
* Register an EM only if the 'dynamic-power-coefficient' property is
* set in devicetree. It is assumed the voltage values are known if that
* property is set since it is useless otherwise. If voltages are not
* known, just let the EM registration fail with an error to alert the
* user about the inconsistent configuration.
*/
ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap);
of_node_put(np);
if (ret || !cap) {
dev_dbg(dev, "Couldn't find proper 'dynamic-power-coefficient' in DT\n");
ret = -EINVAL;
goto failed;
}
EM_SET_ACTIVE_POWER_CB(em_cb, dev_pm_opp_calc_power);
register_em:
ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus, true);
if (ret)
goto failed;
return 0;
failed:
dev_dbg(dev, "Couldn't register Energy Model %d\n", ret);
return ret;
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em);
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