diff options
| author | Viresh Kumar <viresh.kumar@linaro.org> | 2013-04-01 08:57:49 -0400 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-04-02 09:26:32 -0400 |
| commit | 8a67f0ef2b684b34162d39e8f436fe39e9635a19 (patch) | |
| tree | dc997ac3064c69e775485213b824e7c3efeb5b99 /drivers/cpufreq/arm_big_little.h | |
| parent | eb2f50ff93f08c8001d0d7e1148948ba80989aaf (diff) | |
cpufreq: ARM big LITTLE: Add generic cpufreq driver and its DT glue
big LITTLE is ARM's new Architecture focussing power/performance needs of modern
world. More information about big LITTLE can be found here:
http://www.arm.com/products/processors/technologies/biglittleprocessing.php
http://lwn.net/Articles/481055/
In order to keep cpufreq support for all big LITTLE platforms simple/generic,
this patch tries to add a generic cpufreq driver layer for all big LITTLE
platforms.
The driver is divided into two parts:
- Core driver: Generic and shared across all big LITTLE SoC's
- Glue drivers: Per platform drivers providing ops to the core driver
This patch adds in a generic glue driver which would extract information from
Device Tree.
Future SoC's can either reuse the DT glue or write their own depending on the
need.
Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq/arm_big_little.h')
| -rw-r--r-- | drivers/cpufreq/arm_big_little.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/cpufreq/arm_big_little.h b/drivers/cpufreq/arm_big_little.h new file mode 100644 index 000000000000..70f18fc12d4a --- /dev/null +++ b/drivers/cpufreq/arm_big_little.h | |||
| @@ -0,0 +1,40 @@ | |||
| 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 | struct cpufreq_arm_bL_ops { | ||
| 27 | char name[CPUFREQ_NAME_LEN]; | ||
| 28 | int (*get_transition_latency)(struct device *cpu_dev); | ||
| 29 | |||
| 30 | /* | ||
| 31 | * This must set opp table for cpu_dev in a similar way as done by | ||
| 32 | * of_init_opp_table(). | ||
| 33 | */ | ||
| 34 | int (*init_opp_table)(struct device *cpu_dev); | ||
| 35 | }; | ||
| 36 | |||
| 37 | int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops); | ||
| 38 | void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops); | ||
| 39 | |||
| 40 | #endif /* CPUFREQ_ARM_BIG_LITTLE_H */ | ||