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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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 __free(device_node) = _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 */static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table, struct device_node *opp_np){ struct dev_pm_opp *opp;
guard(mutex)(&opp_table->lock);
list_for_each_entry(opp, &opp_table->opp_list, node) { if (opp->np == opp_np) return dev_pm_opp_get(opp); }
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 __free(device_node) = of_get_parent(opp_np);
if (!opp_table_np) return ERR_PTR(-ENODEV);
guard(mutex)(&opp_table_lock);
list_for_each_entry(opp_table, &opp_tables, node) { if (opp_table_np == opp_table->np) return dev_pm_opp_get_opp_table_ref(opp_table); }
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;
guard(mutex)(&opp_table_lock); list_del(&opp_table->lazy);}
/* * 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; bool lazy = false; int count, i, size;
/* Traversing the first OPP node is all we need */ struct device_node *np __free(device_node) = 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;
size = sizeof(*required_opp_tables) + sizeof(*opp_table->required_devs); required_opp_tables = kcalloc(count, size, GFP_KERNEL); if (!required_opp_tables) return;
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++) { struct device_node *required_np __free(device_node) = of_parse_required_opp(np, i);
if (!required_np) { _opp_table_free_required_tables(opp_table); return; }
required_opp_tables[i] = _find_table_of_opp_np(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. */ guard(mutex)(&opp_table_lock); list_add(&opp_table->lazy, &lazy_opp_tables); }}
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index){ struct device_node *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. */ struct device_node *np __free(device_node) = 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;
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 *required_table, int index){ struct device_node *np __free(device_node) = 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 */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 = kzalloc_objs(*opp->required_opps, count); 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; }
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, 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 dev_pm_opp *opp; int i, ret;
guard(mutex)(&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 */ struct device_node *opp_np __free(device_node) = 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 */ struct device_node *required_np __free(device_node) = of_parse_required_opp(opp_np, i); struct device_node *required_table_np __free(device_node) = of_get_parent(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] = dev_pm_opp_get_opp_table_ref(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; } }
/* 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); } }}
static int _bandwidth_supported(struct device *dev, struct opp_table *opp_table){ struct device_node *opp_np __free(device_node) = NULL; struct property *prop;
if (!opp_table) { struct device_node *np __free(device_node) = of_node_get(dev->of_node);
if (!np) return -ENODEV;
opp_np = _opp_of_get_opp_desc_node(np, 0); } 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 */ struct device_node *np __free(device_node) = of_get_next_available_child(opp_np, NULL);
if (!np) { dev_err(dev, "OPP table empty\n"); return -EINVAL; }
prop = of_find_property(np, "opp-peak-kBps", NULL); 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 __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 */ else if (ret <= 0) return ret;
if (!np) return 0;
ret = 0;
count = of_count_phandle_with_args(np, "interconnects", "#interconnect-cells"); 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 = kzalloc_objs(*paths, num_paths); 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; goto free_microwatt; }
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]; }
free_microwatt: 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 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;
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);put_node: of_node_put(np);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){ 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_scoped(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); 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;
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) { 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){ int cpu;
/* Get OPP descriptor node */ struct device_node *np __free(device_node) = 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;
for_each_possible_cpu(cpu) { if (cpu == cpu_dev->id) continue;
struct device_node *cpu_np __free(device_node) = of_cpu_device_node_get(cpu);
if (!cpu_np) { dev_err(cpu_dev, "%s: failed to get cpu%d node\n", __func__, cpu); return -ENOENT; }
/* Get OPP descriptor node */ struct device_node *tmp_np __free(device_node) = _opp_of_get_opp_desc_node(cpu_np, 0);
if (!tmp_np) { pr_err("%pOF: Couldn't find opp node\n", cpu_np); return -ENOENT; }
/* CPUs are sharing opp node */ if (np == tmp_np) cpumask_set_cpu(cpu, cpumask); }
return 0;}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){ int pstate = -EINVAL;
struct device_node *required_np __free(device_node) = of_parse_required_opp(np, index);
if (!required_np) return -ENODEV;
struct opp_table *opp_table __free(put_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; }
struct dev_pm_opp *opp __free(put_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; } }
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){ int count;
struct device_node *opp_np __free(device_node) = _opp_of_get_opp_desc_node(dev->of_node, 0);
if (!opp_np) return false;
struct device_node *np __free(device_node) = of_get_next_available_child(opp_np, NULL);
if (!np) { dev_warn(dev, "Empty OPP table\n"); return false; }
count = of_count_phandle_with_args(np, "required-opps", NULL);
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){ unsigned long opp_freq, opp_power;
/* Find the right frequency and related OPP */ opp_freq = *kHz * 1000;
struct dev_pm_opp *opp __free(put_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, unsigned long *uW, unsigned long *kHz){ unsigned long mV, Hz; u32 cap; u64 tmp; int ret;
struct device_node *np __free(device_node) = 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;
struct dev_pm_opp *opp __free(put_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);
*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 freq = 0;
/* Check if at least one OPP has needed property */ struct dev_pm_opp *opp __free(put_opp) = dev_pm_opp_find_freq_ceil(dev, &freq);
if (IS_ERR(opp)) return false;
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 em_data_callback em_cb; int ret, nr_opp; u32 cap;
if (IS_ERR_OR_NULL(dev)) return -EINVAL;
struct device_node *np __free(device_node) = of_node_get(dev->of_node);
if (!np) { 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; }
/* * 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; }
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);