drivers/cpufreq/arm_big_little.h

   1 /*
   2  * ARM big.LITTLE platform's CPUFreq header file
   3  *
   4  * Copyright (C) 2013 ARM Ltd.
   5  * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
   6  *
   7  * Copyright (C) 2013 Linaro.
   8  * Viresh Kumar <viresh.kumar@linaro.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  15  * kind, whether express or implied; without even the implied warranty
  16  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  */
  19 #ifndef CPUFREQ_ARM_BIG_LITTLE_H
  20 #define CPUFREQ_ARM_BIG_LITTLE_H
  21
  22 #include <linux/cpufreq.h>
  23 #include <linux/device.h>
  24 #include <linux/types.h>
  25
  26 /* Currently we support only two clusters */
  27 #define A15_CLUSTER     0
  28 #define A7_CLUSTER      1
  29 #define MAX_CLUSTERS    2
  30
  31 #ifdef CONFIG_BL_SWITCHER
  32 extern bool bL_switching_enabled;
  33 #define is_bL_switching_enabled()               bL_switching_enabled
  34 #define set_switching_enabled(x)                (bL_switching_enabled = (x))
  35 #else
  36 #define is_bL_switching_enabled()               false
  37 #define set_switching_enabled(x)                do { } while (0)
  38 #endif
  39
  40 struct cpufreq_arm_bL_ops {
  41         char name[CPUFREQ_NAME_LEN];
  42         int (*get_transition_latency)(struct device *cpu_dev);
  43
  44         /*
  45          * This must set opp table for cpu_dev in a similar way as done by
  46          * of_init_opp_table().
  47          */
  48         int (*init_opp_table)(struct device *cpu_dev);
  49 };
  50
  51 static inline int cpu_to_cluster(int cpu)
  52 {
  53         return is_bL_switching_enabled() ? MAX_CLUSTERS:
  54                 topology_physical_package_id(cpu);
  55 }
  56
  57 int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops);
  58 void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops);
  59
  60 #endif /* CPUFREQ_ARM_BIG_LITTLE_H */