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1476 lines
36 KiB
1476 lines
36 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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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 |
|
* Romit Dasgupta |
|
* Kevin Hilman |
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*/ |
|
|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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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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/* "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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|
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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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|
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mutex_unlock(&opp_table->lock); |
|
|
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return NULL; |
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} |
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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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return of_parse_phandle(np, "required-opps", index); |
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} |
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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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|
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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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|
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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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|
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mutex_lock(&opp_table_lock); |
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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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mutex_unlock(&opp_table_lock); |
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return opp_table; |
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} |
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} |
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mutex_unlock(&opp_table_lock); |
|
|
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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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|
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if (!required_opp_tables) |
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return; |
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|
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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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continue; |
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|
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dev_pm_opp_put_opp_table(required_opp_tables[i]); |
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} |
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|
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kfree(required_opp_tables); |
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|
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opp_table->required_opp_count = 0; |
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opp_table->required_opp_tables = NULL; |
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list_del(&opp_table->lazy); |
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} |
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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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bool lazy = false; |
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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_warn(dev, "Empty OPP table\n"); |
|
|
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return; |
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} |
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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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lazy = true; |
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} |
|
|
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/* Let's do the linking later on */ |
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if (lazy) |
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list_add(&opp_table->lazy, &lazy_opp_tables); |
|
|
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goto put_np; |
|
|
|
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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|
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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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|
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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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|
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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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|
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if (!opp_np) |
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return; |
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|
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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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|
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opp_table->np = opp_np; |
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|
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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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|
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if (!required_opps) |
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return; |
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|
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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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continue; |
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|
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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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opp->required_opps = NULL; |
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kfree(required_opps); |
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} |
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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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|
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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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|
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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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|
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/* Required table not added yet, we will link later */ |
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if (IS_ERR_OR_NULL(required_table)) |
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continue; |
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|
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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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|
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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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|
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return ret; |
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} |
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|
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/* Link required OPPs for an individual OPP */ |
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static int lazy_link_required_opps(struct opp_table *opp_table, |
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struct opp_table *new_table, int index) |
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{ |
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struct device_node *required_np; |
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struct dev_pm_opp *opp; |
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|
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list_for_each_entry(opp, &opp_table->opp_list, node) { |
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required_np = of_parse_required_opp(opp->np, index); |
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if (unlikely(!required_np)) |
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return -ENODEV; |
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|
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opp->required_opps[index] = _find_opp_of_np(new_table, required_np); |
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of_node_put(required_np); |
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|
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if (!opp->required_opps[index]) { |
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pr_err("%s: Unable to find required OPP node: %pOF (%d)\n", |
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__func__, opp->np, index); |
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return -ENODEV; |
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} |
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} |
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|
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return 0; |
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} |
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|
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/* Link required OPPs for all OPPs of the newly added OPP table */ |
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static void lazy_link_required_opp_table(struct opp_table *new_table) |
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{ |
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struct opp_table *opp_table, *temp, **required_opp_tables; |
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struct device_node *required_np, *opp_np, *required_table_np; |
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struct dev_pm_opp *opp; |
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int i, ret; |
|
|
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mutex_lock(&opp_table_lock); |
|
|
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list_for_each_entry_safe(opp_table, temp, &lazy_opp_tables, lazy) { |
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bool lazy = false; |
|
|
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/* opp_np can't be invalid here */ |
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opp_np = of_get_next_available_child(opp_table->np, NULL); |
|
|
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for (i = 0; i < opp_table->required_opp_count; i++) { |
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required_opp_tables = opp_table->required_opp_tables; |
|
|
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/* Required opp-table is already parsed */ |
|
if (!IS_ERR(required_opp_tables[i])) |
|
continue; |
|
|
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/* required_np can't be invalid here */ |
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required_np = of_parse_required_opp(opp_np, i); |
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required_table_np = of_get_parent(required_np); |
|
|
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of_node_put(required_table_np); |
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of_node_put(required_np); |
|
|
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/* |
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* Newly added table isn't the required opp-table for |
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* opp_table. |
|
*/ |
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if (required_table_np != new_table->np) { |
|
lazy = true; |
|
continue; |
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} |
|
|
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required_opp_tables[i] = new_table; |
|
_get_opp_table_kref(new_table); |
|
|
|
/* Link OPPs now */ |
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ret = lazy_link_required_opps(opp_table, new_table, i); |
|
if (ret) { |
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/* The OPPs will be marked unusable */ |
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lazy = false; |
|
break; |
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} |
|
} |
|
|
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of_node_put(opp_np); |
|
|
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/* All required opp-tables found, remove from lazy list */ |
|
if (!lazy) { |
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list_del_init(&opp_table->lazy); |
|
|
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list_for_each_entry(opp, &opp_table->opp_list, node) |
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_required_opps_available(opp, opp_table->required_opp_count); |
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} |
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} |
|
|
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mutex_unlock(&opp_table_lock); |
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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); |
|
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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/* Lets not fail in case we are parsing opp-v1 bindings */ |
|
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); |
|
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; |
|
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 == -EINVAL) |
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return 0; /* Empty OPP table is a valid corner-case, let's not fail */ |
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else if (ret <= 0) |
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return ret; |
|
|
|
ret = 0; |
|
|
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np = of_node_get(dev->of_node); |
|
if (!np) |
|
return 0; |
|
|
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count = of_count_phandle_with_args(np, "interconnects", |
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"#interconnect-cells"); |
|
of_node_put(np); |
|
if (count < 0) |
|
return 0; |
|
|
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/* 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) { |
|
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 level:%u\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, |
|
new_opp->level); |
|
|
|
/* |
|
* Notify the changes in the availability of the operable |
|
* frequency/voltage list. |
|
*/ |
|
blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); |
|
return new_opp; |
|
|
|
free_required_opps: |
|
_of_opp_free_required_opps(opp_table, new_opp); |
|
free_opp: |
|
_opp_free(new_opp); |
|
|
|
return 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; |
|
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; |
|
} |
|
} |
|
|
|
lazy_link_required_opp_table(opp_table); |
|
|
|
return 0; |
|
|
|
remove_static_opp: |
|
_opp_remove_all_static(opp_table); |
|
|
|
return ret; |
|
} |
|
|
|
/* Initializes OPP tables based on old-deprecated bindings */ |
|
static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table) |
|
{ |
|
const struct property *prop; |
|
const __be32 *val; |
|
int nr, ret = 0; |
|
|
|
mutex_lock(&opp_table->lock); |
|
if (opp_table->parsed_static_opps) { |
|
opp_table->parsed_static_opps++; |
|
mutex_unlock(&opp_table->lock); |
|
return 0; |
|
} |
|
|
|
opp_table->parsed_static_opps = 1; |
|
mutex_unlock(&opp_table->lock); |
|
|
|
prop = of_find_property(dev->of_node, "operating-points", NULL); |
|
if (!prop) { |
|
ret = -ENODEV; |
|
goto remove_static_opp; |
|
} |
|
if (!prop->value) { |
|
ret = -ENODATA; |
|
goto remove_static_opp; |
|
} |
|
|
|
/* |
|
* Each OPP is a set of tuples consisting of frequency and |
|
* voltage like <freq-kHz vol-uV>. |
|
*/ |
|
nr = prop->length / sizeof(u32); |
|
if (nr % 2) { |
|
dev_err(dev, "%s: Invalid OPP table\n", __func__); |
|
ret = -EINVAL; |
|
goto remove_static_opp; |
|
} |
|
|
|
val = prop->value; |
|
while (nr) { |
|
unsigned long freq = be32_to_cpup(val++) * 1000; |
|
unsigned long volt = be32_to_cpup(val++); |
|
|
|
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; |
|
} |
|
|
|
static int _of_add_table_indexed(struct device *dev, int index, bool getclk) |
|
{ |
|
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, getclk); |
|
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); |
|
} |
|
|
|
/** |
|
* 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) |
|
{ |
|
int ret; |
|
|
|
ret = dev_pm_opp_of_add_table(dev); |
|
if (ret) |
|
return ret; |
|
|
|
return devm_add_action_or_reset(dev, devm_pm_opp_of_table_release, dev); |
|
} |
|
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, true); |
|
} |
|
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, true); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed); |
|
|
|
/** |
|
* dev_pm_opp_of_add_table_noclk() - Initialize indexed opp table from device |
|
* tree without getting clk for device. |
|
* @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. Do not try to get the clk for the |
|
* device. |
|
* |
|
* Return: Refer to dev_pm_opp_of_add_table() for return values. |
|
*/ |
|
int dev_pm_opp_of_add_table_noclk(struct device *dev, int index) |
|
{ |
|
return _of_add_table_indexed(dev, index, false); |
|
} |
|
EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_noclk); |
|
|
|
/* 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);
|
|
|