2  * Generic OPP helper interface for CPU device
4  * Copyright (C) 2009-2014 Texas Instruments Incorporated.
23 #include "opp.h"
28  * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device
30  * @table:	Cpufreq table returned back to caller
32  * Generate a cpufreq table for a provided device- this assumes that the
33  * opp table is already initialized and ready for usage.
35  * This function allocates required memory for the cpufreq table. It is
37  * the table as required.
39  * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM
40  * if no memory available for the operation (table is not populated), returns 0
41  * if successful and table is populated.
44  * the table if any of the mentioned functions have been invoked in the interim.
47 				  struct cpufreq_frequency_table **table)  in dev_pm_opp_init_cpufreq_table()  argument
49 	struct dev_pm_opp *opp;  in dev_pm_opp_init_cpufreq_table()  local
56 		return max_opps ? max_opps : -ENODATA;  in dev_pm_opp_init_cpufreq_table()
60 		return -ENOMEM;  in dev_pm_opp_init_cpufreq_table()
64 		opp = dev_pm_opp_find_freq_ceil(dev, &rate);  in dev_pm_opp_init_cpufreq_table()
65 		if (IS_ERR(opp)) {  in dev_pm_opp_init_cpufreq_table()
66 			ret = PTR_ERR(opp);  in dev_pm_opp_init_cpufreq_table()
72 		/* Is Boost/turbo opp ? */  in dev_pm_opp_init_cpufreq_table()
73 		if (dev_pm_opp_is_turbo(opp))  in dev_pm_opp_init_cpufreq_table()
76 		dev_pm_opp_put(opp);  in dev_pm_opp_init_cpufreq_table()
82 	*table = &freq_table[0];  in dev_pm_opp_init_cpufreq_table()
93  * dev_pm_opp_free_cpufreq_table() - free the cpufreq table
95  * @table:	table to free
97  * Free up the table allocated by dev_pm_opp_init_cpufreq_table
100 				   struct cpufreq_frequency_table **table)  in dev_pm_opp_free_cpufreq_table()  argument
102 	if (!table)  in dev_pm_opp_free_cpufreq_table()
105 	kfree(*table);  in dev_pm_opp_free_cpufreq_table()
106 	*table = NULL;  in dev_pm_opp_free_cpufreq_table()
134  * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask
135  * @cpumask:	cpumask for which OPP table needs to be removed
137  * This removes the OPP tables for CPUs present in the @cpumask.
148  * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs
150  * @cpumask:	cpumask of the CPUs which share the OPP table with @cpu_dev
152  * This marks OPP table of the @cpu_dev as shared by the CPUs present in
155  * Returns -ENODEV if OPP table isn't already present.
170 		if (cpu == cpu_dev->id)  in dev_pm_opp_set_sharing_cpus()
182 			dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n",  in dev_pm_opp_set_sharing_cpus()
187 		/* Mark opp-table as multiple CPUs are sharing it now */  in dev_pm_opp_set_sharing_cpus()
188 		opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;  in dev_pm_opp_set_sharing_cpus()
198  * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev
204  * Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP
205  * table's status is access-unknown.
217 	if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) {  in dev_pm_opp_get_sharing_cpus()
218 		ret = -EINVAL;  in dev_pm_opp_get_sharing_cpus()
224 	if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {  in dev_pm_opp_get_sharing_cpus()
225 		list_for_each_entry(opp_dev, &opp_table->dev_list, node)  in dev_pm_opp_get_sharing_cpus()
226 			cpumask_set_cpu(opp_dev->dev->id, cpumask);  in dev_pm_opp_get_sharing_cpus()
228 		cpumask_set_cpu(cpu_dev->id, cpumask);  in dev_pm_opp_get_sharing_cpus()