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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_device.h>
- #include <linux/pm_domain.h>
- #include <linux/slab.h>
- #include <linux/export.h>
- #include <linux/energy_model.h>
- #include "opp.h"
- /*
- * 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;
- lockdep_assert_held(&opp_table_lock);
- 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);
- list_for_each_entry(opp_table, &opp_tables, node) {
- if (opp_table_np == opp_table->np) {
- _get_opp_table_kref(opp_table);
- return opp_table;
- }
- }
- 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]))
- break;
- 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;
- }
- /*
- * 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;
- int count, i;
- /* Traversing the first OPP node is all we need */
- np = of_get_next_available_child(opp_np, NULL);
- if (!np) {
- dev_err(dev, "Empty OPP table\n");
- return;
- }
- count = of_count_phandle_with_args(np, "required-opps", NULL);
- if (!count)
- goto put_np;
- required_opp_tables = kcalloc(count, sizeof(*required_opp_tables),
- GFP_KERNEL);
- if (!required_opp_tables)
- goto put_np;
- opp_table->required_opp_tables = required_opp_tables;
- 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]))
- goto free_required_tables;
- /*
- * We only support genpd's OPPs in the "required-opps" for now,
- * as we don't know how much about other cases. Error out if the
- * required OPP doesn't belong to a genpd.
- */
- if (!required_opp_tables[i]->is_genpd) {
- dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
- required_np);
- goto free_required_tables;
- }
- }
- 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_find_property(np, "#power-domain-cells", NULL))
- 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);
- of_node_put(opp_np);
- }
- void _of_clear_opp_table(struct opp_table *opp_table)
- {
- _opp_table_free_required_tables(opp_table);
- }
- /*
- * Release all resources previously acquired with a call to
- * _of_opp_alloc_required_opps().
- */
- 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])
- break;
- /* Put the reference back */
- dev_pm_opp_put(required_opps[i]);
- }
- kfree(required_opps);
- opp->required_opps = NULL;
- }
- /* 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 dev_pm_opp **required_opps;
- struct opp_table *required_table;
- struct device_node *np;
- int i, ret, count = opp_table->required_opp_count;
- if (!count)
- return 0;
- required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL);
- if (!required_opps)
- return -ENOMEM;
- opp->required_opps = required_opps;
- for (i = 0; i < count; i++) {
- required_table = opp_table->required_opp_tables[i];
- np = of_parse_required_opp(opp->np, i);
- if (unlikely(!np)) {
- ret = -ENODEV;
- goto free_required_opps;
- }
- required_opps[i] = _find_opp_of_np(required_table, np);
- of_node_put(np);
- if (!required_opps[i]) {
- pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
- __func__, opp->np, i);
- ret = -ENODEV;
- goto free_required_opps;
- }
- }
- return 0;
- free_required_opps:
- _of_opp_free_required_opps(opp_table, opp);
- return ret;
- }
- 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);
- if (!np) {
- dev_err(dev, "OPP table empty\n");
- return -EINVAL;
- }
- of_node_put(opp_np);
- 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 <= 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 = PTR_ERR(paths[i]);
- if (ret != -EPROBE_DEFER) {
- dev_err(dev, "%s: Unable to get path%d: %d\n",
- __func__, i, ret);
- }
- 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_find_property(np, "opp-supported-hw", NULL))
- 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 int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
- struct opp_table *opp_table)
- {
- u32 *microvolt, *microamp = NULL;
- int supplies = opp_table->regulator_count, vcount, icount, ret, i, j;
- struct property *prop = NULL;
- char name[NAME_MAX];
- /* Search for "opp-microvolt-<name>" */
- if (opp_table->prop_name) {
- snprintf(name, sizeof(name), "opp-microvolt-%s",
- opp_table->prop_name);
- prop = of_find_property(opp->np, name, NULL);
- }
- if (!prop) {
- /* Search for "opp-microvolt" */
- sprintf(name, "opp-microvolt");
- prop = of_find_property(opp->np, name, NULL);
- /* Missing property isn't a problem, but an invalid entry is */
- if (!prop) {
- if (unlikely(supplies == -1)) {
- /* Initialize regulator_count */
- opp_table->regulator_count = 0;
- return 0;
- }
- if (!supplies)
- return 0;
- dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
- __func__);
- return -EINVAL;
- }
- }
- if (unlikely(supplies == -1)) {
- /* Initialize regulator_count */
- supplies = opp_table->regulator_count = 1;
- } else if (unlikely(!supplies)) {
- dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__);
- return -EINVAL;
- }
- vcount = of_property_count_u32_elems(opp->np, name);
- if (vcount < 0) {
- dev_err(dev, "%s: Invalid %s property (%d)\n",
- __func__, name, vcount);
- return vcount;
- }
- /* There can be one or three elements per supply */
- if (vcount != supplies && vcount != supplies * 3) {
- dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
- __func__, name, vcount, supplies);
- return -EINVAL;
- }
- microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL);
- if (!microvolt)
- return -ENOMEM;
- ret = of_property_read_u32_array(opp->np, name, microvolt, vcount);
- if (ret) {
- dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
- ret = -EINVAL;
- goto free_microvolt;
- }
- /* Search for "opp-microamp-<name>" */
- prop = NULL;
- if (opp_table->prop_name) {
- snprintf(name, sizeof(name), "opp-microamp-%s",
- opp_table->prop_name);
- prop = of_find_property(opp->np, name, NULL);
- }
- if (!prop) {
- /* Search for "opp-microamp" */
- sprintf(name, "opp-microamp");
- prop = of_find_property(opp->np, name, NULL);
- }
- if (prop) {
- icount = of_property_count_u32_elems(opp->np, name);
- if (icount < 0) {
- dev_err(dev, "%s: Invalid %s property (%d)\n", __func__,
- name, icount);
- ret = icount;
- goto free_microvolt;
- }
- if (icount != supplies) {
- dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
- __func__, name, icount, supplies);
- ret = -EINVAL;
- goto free_microvolt;
- }
- microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL);
- if (!microamp) {
- ret = -EINVAL;
- goto free_microvolt;
- }
- ret = of_property_read_u32_array(opp->np, name, microamp,
- icount);
- if (ret) {
- dev_err(dev, "%s: error parsing %s: %d\n", __func__,
- name, ret);
- ret = -EINVAL;
- goto free_microamp;
- }
- }
- for (i = 0, j = 0; i < supplies; i++) {
- opp->supplies[i].u_volt = microvolt[j++];
- if (vcount == supplies) {
- opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
- opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
- } else {
- opp->supplies[i].u_volt_min = microvolt[j++];
- opp->supplies[i].u_volt_max = microvolt[j++];
- }
- if (microamp)
- opp->supplies[i].u_amp = microamp[i];
- }
- 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_bw(struct dev_pm_opp *new_opp, struct opp_table *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 (table->path_count != count) {
- pr_err("%s: Mismatch between %s and paths (%d %d)\n",
- __func__, name, count, 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 *table,
- struct device_node *np, bool *rate_not_available)
- {
- bool found = false;
- u64 rate;
- int ret;
- ret = of_property_read_u64(np, "opp-hz", &rate);
- if (!ret) {
- /*
- * 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.
- */
- new_opp->rate = (unsigned long)rate;
- found = true;
- }
- *rate_not_available = !!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, table, np, true);
- if (!ret) {
- found = true;
- ret = _read_bw(new_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;
- bool rate_not_available = false;
- new_opp = _opp_allocate(opp_table);
- if (!new_opp)
- return ERR_PTR(-ENOMEM);
- ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available);
- if (ret < 0 && !opp_table->is_genpd) {
- 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: %lu\n",
- new_opp->rate);
- goto free_opp;
- }
- new_opp->turbo = of_property_read_bool(np, "turbo-mode");
- new_opp->np = 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;
- if (opp_table->is_genpd)
- new_opp->pstate = pm_genpd_opp_to_performance_state(dev, new_opp);
- ret = _opp_add(dev, new_opp, opp_table, rate_not_available);
- 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 as suspend OPP */
- if (new_opp->rate > opp_table->suspend_opp->rate) {
- 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\n",
- __func__, new_opp->turbo, new_opp->rate,
- 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);
- /*
- * 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;
- }
- list_for_each_entry(opp, &opp_table->opp_list, node) {
- /* Any non-zero performance state would enable the feature */
- if (opp->pstate) {
- opp_table->genpd_performance_state = true;
- break;
- }
- }
- 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++);
- ret = _opp_add_v1(opp_table, dev, freq, volt, false);
- if (ret) {
- dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
- __func__, freq, ret);
- goto remove_static_opp;
- }
- nr -= 2;
- }
- return 0;
- remove_static_opp:
- _opp_remove_all_static(opp_table);
- return ret;
- }
- /**
- * 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)
- {
- struct opp_table *opp_table;
- int ret;
- opp_table = dev_pm_opp_get_opp_table_indexed(dev, 0);
- 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;
- }
- 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:
- * 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_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 = dev_pm_opp_get_opp_table_indexed(dev, index);
- if (IS_ERR(opp_table))
- return PTR_ERR(opp_table);
- ret = _of_add_opp_table_v2(dev, opp_table);
- if (ret)
- dev_pm_opp_put_opp_table(opp_table);
- return ret;
- }
- EXPORT_SYMBOL_GPL(dev_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;
- }
- opp = _find_opp_of_np(opp_table, required_np);
- if (opp) {
- pstate = opp->pstate;
- 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_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.
- * 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 @mW 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.
- *
- * Returns -EINVAL if the power calculation failed because of missing
- * parameters, 0 otherwise.
- */
- static int __maybe_unused _get_power(unsigned long *mW, unsigned long *kHz,
- struct device *dev)
- {
- 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);
- do_div(tmp, 1000000000);
- *mW = (unsigned long)tmp;
- *kHz = Hz / 1000;
- return 0;
- }
- /**
- * 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 = EM_DATA_CB(_get_power);
- 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;
- }
- 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;
- }
- 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);
|