![Rafael J. Wysocki](/assets/img/avatar_default.png)
* pm-em: OPP: refactor dev_pm_opp_of_register_em() and update related drivers Documentation: power: update Energy Model description PM / EM: change name of em_pd_energy to em_cpu_energy PM / EM: remove em_register_perf_domain PM / EM: add support for other devices than CPUs in Energy Model PM / EM: update callback structure and add device pointer PM / EM: introduce em_dev_register_perf_domain function PM / EM: change naming convention from 'capacity' to 'performance' * pm-core: mmc: jz4740: Use pm_ptr() macro PM: Make *_DEV_PM_OPS macros use __maybe_unused PM: core: introduce pm_ptr() macro
1321 lines
32 KiB
C
1321 lines
32 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Generic OPP OF helpers
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cpu.h>
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#include <linux/errno.h>
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#include <linux/device.h>
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#include <linux/of_device.h>
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#include <linux/pm_domain.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/energy_model.h>
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#include "opp.h"
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/*
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* Returns opp descriptor node for a device node, caller must
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* do of_node_put().
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*/
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static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,
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int index)
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{
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/* "operating-points-v2" can be an array for power domain providers */
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return of_parse_phandle(np, "operating-points-v2", index);
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}
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/* Returns opp descriptor node for a device, caller must do of_node_put() */
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struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
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{
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return _opp_of_get_opp_desc_node(dev->of_node, 0);
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
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struct opp_table *_managed_opp(struct device *dev, int index)
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{
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struct opp_table *opp_table, *managed_table = NULL;
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struct device_node *np;
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np = _opp_of_get_opp_desc_node(dev->of_node, index);
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if (!np)
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return NULL;
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list_for_each_entry(opp_table, &opp_tables, node) {
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if (opp_table->np == np) {
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/*
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* Multiple devices can point to the same OPP table and
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* so will have same node-pointer, np.
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*
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* But the OPPs will be considered as shared only if the
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* OPP table contains a "opp-shared" property.
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*/
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if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
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_get_opp_table_kref(opp_table);
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managed_table = opp_table;
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}
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break;
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}
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}
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of_node_put(np);
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return managed_table;
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}
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/* The caller must call dev_pm_opp_put() after the OPP is used */
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static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table,
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struct device_node *opp_np)
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{
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struct dev_pm_opp *opp;
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mutex_lock(&opp_table->lock);
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list_for_each_entry(opp, &opp_table->opp_list, node) {
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if (opp->np == opp_np) {
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dev_pm_opp_get(opp);
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mutex_unlock(&opp_table->lock);
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return opp;
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}
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}
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mutex_unlock(&opp_table->lock);
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return NULL;
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}
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static struct device_node *of_parse_required_opp(struct device_node *np,
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int index)
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{
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struct device_node *required_np;
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required_np = of_parse_phandle(np, "required-opps", index);
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if (unlikely(!required_np)) {
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pr_err("%s: Unable to parse required-opps: %pOF, index: %d\n",
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__func__, np, index);
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}
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return required_np;
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}
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/* The caller must call dev_pm_opp_put_opp_table() after the table is used */
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static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np)
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{
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struct opp_table *opp_table;
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struct device_node *opp_table_np;
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lockdep_assert_held(&opp_table_lock);
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opp_table_np = of_get_parent(opp_np);
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if (!opp_table_np)
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goto err;
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/* It is safe to put the node now as all we need now is its address */
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of_node_put(opp_table_np);
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list_for_each_entry(opp_table, &opp_tables, node) {
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if (opp_table_np == opp_table->np) {
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_get_opp_table_kref(opp_table);
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return opp_table;
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}
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}
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err:
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return ERR_PTR(-ENODEV);
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}
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/* Free resources previously acquired by _opp_table_alloc_required_tables() */
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static void _opp_table_free_required_tables(struct opp_table *opp_table)
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{
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struct opp_table **required_opp_tables = opp_table->required_opp_tables;
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int i;
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if (!required_opp_tables)
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return;
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for (i = 0; i < opp_table->required_opp_count; i++) {
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if (IS_ERR_OR_NULL(required_opp_tables[i]))
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break;
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dev_pm_opp_put_opp_table(required_opp_tables[i]);
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}
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kfree(required_opp_tables);
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opp_table->required_opp_count = 0;
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opp_table->required_opp_tables = NULL;
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}
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/*
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* Populate all devices and opp tables which are part of "required-opps" list.
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* Checking only the first OPP node should be enough.
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*/
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static void _opp_table_alloc_required_tables(struct opp_table *opp_table,
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struct device *dev,
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struct device_node *opp_np)
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{
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struct opp_table **required_opp_tables;
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struct device_node *required_np, *np;
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int count, i;
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/* Traversing the first OPP node is all we need */
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np = of_get_next_available_child(opp_np, NULL);
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if (!np) {
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dev_err(dev, "Empty OPP table\n");
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return;
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}
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count = of_count_phandle_with_args(np, "required-opps", NULL);
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if (!count)
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goto put_np;
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required_opp_tables = kcalloc(count, sizeof(*required_opp_tables),
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GFP_KERNEL);
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if (!required_opp_tables)
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goto put_np;
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opp_table->required_opp_tables = required_opp_tables;
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opp_table->required_opp_count = count;
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for (i = 0; i < count; i++) {
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required_np = of_parse_required_opp(np, i);
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if (!required_np)
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goto free_required_tables;
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required_opp_tables[i] = _find_table_of_opp_np(required_np);
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of_node_put(required_np);
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if (IS_ERR(required_opp_tables[i]))
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goto free_required_tables;
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/*
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* We only support genpd's OPPs in the "required-opps" for now,
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* as we don't know how much about other cases. Error out if the
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* required OPP doesn't belong to a genpd.
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*/
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if (!required_opp_tables[i]->is_genpd) {
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dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n",
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required_np);
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goto free_required_tables;
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}
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}
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goto put_np;
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free_required_tables:
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_opp_table_free_required_tables(opp_table);
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put_np:
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of_node_put(np);
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}
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void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
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int index)
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{
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struct device_node *np, *opp_np;
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u32 val;
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/*
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* Only required for backward compatibility with v1 bindings, but isn't
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* harmful for other cases. And so we do it unconditionally.
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*/
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np = of_node_get(dev->of_node);
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if (!np)
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return;
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if (!of_property_read_u32(np, "clock-latency", &val))
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opp_table->clock_latency_ns_max = val;
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of_property_read_u32(np, "voltage-tolerance",
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&opp_table->voltage_tolerance_v1);
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if (of_find_property(np, "#power-domain-cells", NULL))
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opp_table->is_genpd = true;
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/* Get OPP table node */
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opp_np = _opp_of_get_opp_desc_node(np, index);
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of_node_put(np);
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if (!opp_np)
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return;
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if (of_property_read_bool(opp_np, "opp-shared"))
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opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
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else
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opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
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opp_table->np = opp_np;
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_opp_table_alloc_required_tables(opp_table, dev, opp_np);
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of_node_put(opp_np);
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}
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void _of_clear_opp_table(struct opp_table *opp_table)
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{
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_opp_table_free_required_tables(opp_table);
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}
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/*
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* Release all resources previously acquired with a call to
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* _of_opp_alloc_required_opps().
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*/
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void _of_opp_free_required_opps(struct opp_table *opp_table,
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struct dev_pm_opp *opp)
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{
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struct dev_pm_opp **required_opps = opp->required_opps;
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int i;
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if (!required_opps)
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return;
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for (i = 0; i < opp_table->required_opp_count; i++) {
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if (!required_opps[i])
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break;
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/* Put the reference back */
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dev_pm_opp_put(required_opps[i]);
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}
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kfree(required_opps);
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opp->required_opps = NULL;
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}
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/* Populate all required OPPs which are part of "required-opps" list */
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static int _of_opp_alloc_required_opps(struct opp_table *opp_table,
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struct dev_pm_opp *opp)
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{
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struct dev_pm_opp **required_opps;
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struct opp_table *required_table;
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struct device_node *np;
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int i, ret, count = opp_table->required_opp_count;
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if (!count)
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return 0;
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required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL);
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if (!required_opps)
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return -ENOMEM;
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opp->required_opps = required_opps;
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for (i = 0; i < count; i++) {
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required_table = opp_table->required_opp_tables[i];
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np = of_parse_required_opp(opp->np, i);
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if (unlikely(!np)) {
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ret = -ENODEV;
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goto free_required_opps;
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}
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required_opps[i] = _find_opp_of_np(required_table, np);
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of_node_put(np);
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if (!required_opps[i]) {
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pr_err("%s: Unable to find required OPP node: %pOF (%d)\n",
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__func__, opp->np, i);
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ret = -ENODEV;
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goto free_required_opps;
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}
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}
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return 0;
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free_required_opps:
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_of_opp_free_required_opps(opp_table, opp);
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return ret;
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}
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static int _bandwidth_supported(struct device *dev, struct opp_table *opp_table)
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{
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struct device_node *np, *opp_np;
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struct property *prop;
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if (!opp_table) {
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np = of_node_get(dev->of_node);
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if (!np)
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return -ENODEV;
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opp_np = _opp_of_get_opp_desc_node(np, 0);
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of_node_put(np);
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} else {
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opp_np = of_node_get(opp_table->np);
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}
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/* Lets not fail in case we are parsing opp-v1 bindings */
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if (!opp_np)
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return 0;
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/* Checking only first OPP is sufficient */
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np = of_get_next_available_child(opp_np, NULL);
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if (!np) {
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dev_err(dev, "OPP table empty\n");
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return -EINVAL;
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}
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of_node_put(opp_np);
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prop = of_find_property(np, "opp-peak-kBps", NULL);
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of_node_put(np);
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if (!prop || !prop->length)
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return 0;
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return 1;
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}
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int dev_pm_opp_of_find_icc_paths(struct device *dev,
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struct opp_table *opp_table)
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{
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struct device_node *np;
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int ret, i, count, num_paths;
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struct icc_path **paths;
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ret = _bandwidth_supported(dev, opp_table);
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if (ret <= 0)
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return ret;
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ret = 0;
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np = of_node_get(dev->of_node);
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if (!np)
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return 0;
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count = of_count_phandle_with_args(np, "interconnects",
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"#interconnect-cells");
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of_node_put(np);
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if (count < 0)
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return 0;
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/* two phandles when #interconnect-cells = <1> */
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if (count % 2) {
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dev_err(dev, "%s: Invalid interconnects values\n", __func__);
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return -EINVAL;
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}
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num_paths = count / 2;
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paths = kcalloc(num_paths, sizeof(*paths), GFP_KERNEL);
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if (!paths)
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return -ENOMEM;
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for (i = 0; i < num_paths; i++) {
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paths[i] = of_icc_get_by_index(dev, i);
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if (IS_ERR(paths[i])) {
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ret = PTR_ERR(paths[i]);
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if (ret != -EPROBE_DEFER) {
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dev_err(dev, "%s: Unable to get path%d: %d\n",
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__func__, i, ret);
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}
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goto err;
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}
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}
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if (opp_table) {
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opp_table->paths = paths;
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opp_table->path_count = num_paths;
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return 0;
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}
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err:
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while (i--)
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icc_put(paths[i]);
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kfree(paths);
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return ret;
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_find_icc_paths);
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static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
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struct device_node *np)
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{
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unsigned int count = opp_table->supported_hw_count;
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u32 version;
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int ret;
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if (!opp_table->supported_hw) {
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/*
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* In the case that no supported_hw has been set by the
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* platform but there is an opp-supported-hw value set for
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* an OPP then the OPP should not be enabled as there is
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* no way to see if the hardware supports it.
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*/
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if (of_find_property(np, "opp-supported-hw", NULL))
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return false;
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else
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return true;
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}
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while (count--) {
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ret = of_property_read_u32_index(np, "opp-supported-hw", count,
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&version);
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if (ret) {
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dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
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__func__, count, ret);
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return false;
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}
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/* Both of these are bitwise masks of the versions */
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if (!(version & opp_table->supported_hw[count]))
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return false;
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}
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return true;
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}
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static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
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struct opp_table *opp_table)
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{
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u32 *microvolt, *microamp = NULL;
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int supplies = opp_table->regulator_count, vcount, icount, ret, i, j;
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struct property *prop = NULL;
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char name[NAME_MAX];
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/* Search for "opp-microvolt-<name>" */
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if (opp_table->prop_name) {
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snprintf(name, sizeof(name), "opp-microvolt-%s",
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opp_table->prop_name);
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prop = of_find_property(opp->np, name, NULL);
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}
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if (!prop) {
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/* Search for "opp-microvolt" */
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sprintf(name, "opp-microvolt");
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prop = of_find_property(opp->np, name, NULL);
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|
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/* Missing property isn't a problem, but an invalid entry is */
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if (!prop) {
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if (unlikely(supplies == -1)) {
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/* Initialize regulator_count */
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opp_table->regulator_count = 0;
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return 0;
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}
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|
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if (!supplies)
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return 0;
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dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
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__func__);
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return -EINVAL;
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}
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}
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if (unlikely(supplies == -1)) {
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/* Initialize regulator_count */
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supplies = opp_table->regulator_count = 1;
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} else if (unlikely(!supplies)) {
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dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__);
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return -EINVAL;
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}
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|
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vcount = of_property_count_u32_elems(opp->np, name);
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if (vcount < 0) {
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dev_err(dev, "%s: Invalid %s property (%d)\n",
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__func__, name, vcount);
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return vcount;
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}
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|
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/* There can be one or three elements per supply */
|
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if (vcount != supplies && vcount != supplies * 3) {
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dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
|
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__func__, name, vcount, supplies);
|
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return -EINVAL;
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}
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|
|
|
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_find_and_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;
|
|
u64 rate = 0;
|
|
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: %llu\n", 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 ERR_PTR(ret);
|
|
}
|
|
|
|
/* 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, pstate_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 of more OPP defined */
|
|
if (WARN_ON(!count)) {
|
|
ret = -ENOENT;
|
|
goto remove_static_opp;
|
|
}
|
|
|
|
list_for_each_entry(opp, &opp_table->opp_list, node)
|
|
pstate_count += !!opp->pstate;
|
|
|
|
/* Either all or none of the nodes shall have performance state set */
|
|
if (pstate_count && pstate_count != count) {
|
|
dev_err(dev, "Not all nodes have performance state set (%d: %d)\n",
|
|
count, pstate_count);
|
|
ret = -ENOENT;
|
|
goto remove_static_opp;
|
|
}
|
|
|
|
if (pstate_count)
|
|
opp_table->genpd_performance_state = true;
|
|
|
|
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;
|
|
|
|
prop = of_find_property(dev->of_node, "operating-points", NULL);
|
|
if (!prop)
|
|
return -ENODEV;
|
|
if (!prop->value)
|
|
return -ENODATA;
|
|
|
|
/*
|
|
* 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__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
opp_table->parsed_static_opps = 1;
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
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);
|
|
_opp_remove_all_static(opp_table);
|
|
return ret;
|
|
}
|
|
nr -= 2;
|
|
}
|
|
|
|
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 (!opp_table)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* 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 (!opp_table)
|
|
return -ENOMEM;
|
|
|
|
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 -EINVAL;
|
|
|
|
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);
|
|
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);
|