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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>
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/*
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* ARM big.LITTLE platform's CPUFreq header file
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*
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* Copyright (C) 2013 ARM Ltd.
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* Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
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*
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* Copyright (C) 2013 Linaro.
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* Viresh Kumar <viresh.kumar@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef CPUFREQ_ARM_BIG_LITTLE_H
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#define CPUFREQ_ARM_BIG_LITTLE_H
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#include <linux/cpufreq.h>
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#include <linux/device.h>
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#include <linux/types.h>
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struct cpufreq_arm_bL_ops {
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char name[CPUFREQ_NAME_LEN];
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int (*get_transition_latency)(struct device *cpu_dev);
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/*
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* This must set opp table for cpu_dev in a similar way as done by
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* of_init_opp_table().
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*/
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int (*init_opp_table)(struct device *cpu_dev);
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};
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int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops);
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void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops);
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#endif /* CPUFREQ_ARM_BIG_LITTLE_H */
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