/* 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().
*/ staticstruct 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);
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)
managed_table = dev_pm_opp_get_opp_table_ref(opp_table);
break;
}
}
return managed_table;
}
/* The caller must call dev_pm_opp_put() after the OPP is used */ staticstruct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table, struct device_node *opp_np)
{ struct dev_pm_opp *opp;
/* The caller must call dev_pm_opp_put_opp_table() after the table is used */ staticstruct opp_table *_find_table_of_opp_np(struct device_node *opp_np)
{ struct device_node *opp_table_np __free(device_node); struct opp_table *opp_table;
opp_table_np = of_get_parent(opp_np); if (!opp_table_np) return ERR_PTR(-ENODEV);
/* * Populate all devices and opp tables which are part of "required-opps" list. * Checking only the first OPP node should be enough.
*/ staticvoid _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 *np __free(device_node); 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) return;
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.
*/
guard(mutex)(&opp_table_lock);
list_add(&opp_table->lazy, &lazy_opp_tables);
}
}
/* * 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); 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;
np = of_parse_required_opp(opp->np, index); if (unlikely(!np)) return -ENODEV;
opp->required_opps[index] = _find_opp_of_np(required_table, np); if (!opp->required_opps[index]) {
pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
__func__, opp->np, index); return -ENODEV;
}
return 0;
}
/* Populate all required OPPs which are part of "required-opps" list */ staticint _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, required_table, i); if (ret) goto free_required_opps;
}
/* Link required OPPs for an individual OPP */ staticint 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, new_table, index); if (ret) return ret;
}
return 0;
}
/* Link required OPPs for all OPPs of the newly added OPP table */ staticvoid lazy_link_required_opp_table(struct opp_table *new_table)
{ struct opp_table *opp_table, *temp, **required_opp_tables; struct dev_pm_opp *opp; int i, ret;
/* 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); if (!np) {
dev_err(dev, "OPP table empty\n"); return -EINVAL;
}
int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table)
{ struct device_node *np __free(device_node) = of_node_get(dev->of_node); 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 */ elseif (ret <= 0) return ret;
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->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")) returnfalse; else returntrue;
}
/* * 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);
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;
}
staticint 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++];
/** * 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);
staticint _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] = (unsignedlong)rates[i];
/* This will happen for frequencies > 4.29 GHz */
WARN_ON(new_opp->rates[i] != rates[i]);
}
}
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;
}
staticint _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; elseif (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
*/ staticstruct 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;
}
ret = _of_opp_alloc_required_opps(opp_table, new_opp); if (ret) goto put_node;
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;
/* * 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;
/* Initializes OPP tables based on new bindings */ staticint _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 */
scoped_guard(mutex, &opp_table->lock) { if (opp_table->parsed_static_opps) {
opp_table->parsed_static_opps++; return 0;
}
opp_table->parsed_static_opps = 1;
}
/* 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;
} elseif (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;
}
/* Initializes OPP tables based on old-deprecated bindings */ staticint _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table)
{ conststruct property *prop; const __be32 *val; int nr, ret = 0;
scoped_guard(mutex, &opp_table->lock) { if (opp_table->parsed_static_opps) {
opp_table->parsed_static_opps++; return 0;
}
opp_table->parsed_static_opps = 1;
}
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) { unsignedlong freq = be32_to_cpup(val++) * 1000; unsignedlong 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;
}
staticint _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);
/** * 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(conststruct 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(conststruct 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);
/* * 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 __free(device_node); int cpu;
/* 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")) return 0;
/** * 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 device_node *required_np __free(device_node); struct opp_table *opp_table __free(put_opp_table) = NULL; struct dev_pm_opp *opp __free(put_opp) = NULL; 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)); return PTR_ERR(opp_table);
}
/* 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__); return -EINVAL;
}
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_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 *np __free(device_node) = NULL, *opp_np __free(device_node); int count;
opp_np = _opp_of_get_opp_desc_node(dev->of_node, 0); if (!opp_np) returnfalse;
np = of_get_next_available_child(opp_np, NULL); if (!np) {
dev_warn(dev, "Empty OPP table\n"); returnfalse;
}
/** * 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;
}
/* * 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.
*/ staticint __maybe_unused
_get_dt_power(struct device *dev, unsignedlong *uW, unsignedlong *kHz)
{ struct dev_pm_opp *opp __free(put_opp); unsignedlong 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); 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, unsignedlong *uW, unsignedlong *kHz)
{ struct dev_pm_opp *opp __free(put_opp) = NULL; struct device_node *np __free(device_node); unsignedlong 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); 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; if (!mV) return -EINVAL;
tmp = (u64)cap * mV * mV * (Hz / 1000000); /* Provide power in micro-Watts */
do_div(tmp, 1000000);
/* Check if at least one OPP has needed property */
opp = dev_pm_opp_find_freq_ceil(dev, &freq); if (IS_ERR(opp)) returnfalse;
return !!dev_pm_opp_get_power(opp);
}
/** * 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 device_node *np __free(device_node) = NULL; struct em_data_callback em_cb; 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); if (ret || !cap) {
dev_dbg(dev, "Couldn't find proper 'dynamic-power-coefficient' in DT\n");
ret = -EINVAL; goto failed;
}
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