1 // SPDX-License-Identifier: GPL-2.0-only
3  * Generic OPP helper interface for CPU device
5  * Copyright (C) 2009-2014 Texas Instruments Incorporated.
20 #include "opp.h"
25  * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
27  * @table:	Cpufreq table returned back to caller
29  * Generate a cpufreq table for a provided device- this assumes that the
30  * opp table is already initialized and ready for usage.
32  * This function allocates required memory for the cpufreq table. It is
34  * the table as required.
36  * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
37  * if no memory available for the operation (table is not populated), returns 0
38  * if successful and table is populated.
41  * the table if any of the mentioned functions have been invoked in the interim.
46 	struct dev_pm_opp *opp;  in dev_pm_opp_init_cpufreq_table()  local
53 		return max_opps ? max_opps : -ENODATA;  in dev_pm_opp_init_cpufreq_table()
57 		return -ENOMEM;  in dev_pm_opp_init_cpufreq_table()
61 		opp = dev_pm_opp_find_freq_ceil(dev, &rate);  in dev_pm_opp_init_cpufreq_table()
62 		if (IS_ERR(opp)) {  in dev_pm_opp_init_cpufreq_table()
63 			ret = PTR_ERR(opp);  in dev_pm_opp_init_cpufreq_table()
69 		/* Is Boost/turbo opp ? */  in dev_pm_opp_init_cpufreq_table()
70 		if (dev_pm_opp_is_turbo(opp))  in dev_pm_opp_init_cpufreq_table()
73 		dev_pm_opp_put(opp);  in dev_pm_opp_init_cpufreq_table()
90  * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
92  * @table:	table to free
94  * Free up the table allocated by dev_pm_opp_init_cpufreq_table
132  * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
133  * @cpumask:	cpumask for which OPP table needs to be removed
135  * This removes the OPP tables for CPUs present in the @cpumask.
141 	_dev_pm_opp_cpumask_remove_table(cpumask, -1);  in dev_pm_opp_cpumask_remove_table()
146  * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
148  * @cpumask:	cpumask of the CPUs which share the OPP table with @cpu_dev
150  * This marks OPP table of the @cpu_dev as shared by the CPUs present in
153  * Returns -ENODEV if OPP table isn't already present.
168 		if (cpu == cpu_dev->id)  in dev_pm_opp_set_sharing_cpus()
180 			dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",  in dev_pm_opp_set_sharing_cpus()
185 		/* Mark opp-table as multiple CPUs are sharing it now */  in dev_pm_opp_set_sharing_cpus()
186 		opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;  in dev_pm_opp_set_sharing_cpus()
196  * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
202  * Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
203  * table's status is access-unknown.
215 	if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {  in dev_pm_opp_get_sharing_cpus()
216 		ret = -EINVAL;  in dev_pm_opp_get_sharing_cpus()
222 	if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {  in dev_pm_opp_get_sharing_cpus()
223 		mutex_lock(&opp_table->lock);  in dev_pm_opp_get_sharing_cpus()
224 		list_for_each_entry(opp_dev, &opp_table->dev_list, node)  in dev_pm_opp_get_sharing_cpus()
225 			cpumask_set_cpu(opp_dev->dev->id, cpumask);  in dev_pm_opp_get_sharing_cpus()
226 		mutex_unlock(&opp_table->lock);  in dev_pm_opp_get_sharing_cpus()
228 		cpumask_set_cpu(cpu_dev->id, cpumask);  in dev_pm_opp_get_sharing_cpus()