drivers/opp/cpu.c

1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2009-2014 Texas Instruments Incorporated.
25  * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
29  * Generate a cpufreq table for a provided device- this assumes that the
32  * This function allocates required memory for the cpufreq table. It is
33  * expected that the caller does the required maintenance such as freeing
34  * the table as required.
36  * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
53 		return max_opps ? max_opps : -ENODATA;  in dev_pm_opp_init_cpufreq_table()
57 		return -ENOMEM;  in dev_pm_opp_init_cpufreq_table()
90  * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
132  * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
136  * This should be used to remove all the OPPs entries associated with
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
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
200  * This updates the @cpumask with CPUs that are 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()