f34edeefa0
Trinket target support LPDDR3 and LPDDR4 HW supporting different frequency levels, update devfreq drivers to detect the DDR type and add frequency tables accordingly. Change-Id: I5286466274a3e96739b1feecdaccc9bea773d2b8 Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
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* Copyright (c) 2015-2017, 2019, The Linux Foundation. All rights reserved.
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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 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* 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 _GOVERNOR_MEMLAT_H
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#define _GOVERNOR_MEMLAT_H
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#include <linux/kernel.h>
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#include <linux/devfreq.h>
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/**
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* struct dev_stats - Device stats
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* @inst_count: Number of instructions executed.
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* @mem_count: Number of memory accesses made.
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* @freq: Effective frequency of the device in the
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* last interval.
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*/
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struct dev_stats {
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int id;
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unsigned long inst_count;
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unsigned long mem_count;
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unsigned long freq;
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unsigned long stall_pct;
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};
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struct core_dev_map {
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unsigned int core_mhz;
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unsigned int target_freq;
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};
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/**
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* struct memlat_hwmon - Memory Latency HW monitor info
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* @start_hwmon: Start the HW monitoring
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* @stop_hwmon: Stop the HW monitoring
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* @get_cnt: Return the number of intructions executed,
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* memory accesses and effective frequency
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* @dev: Pointer to device that this HW monitor can
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* monitor.
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* @of_node: OF node of device that this HW monitor can
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* monitor.
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* @df: Devfreq node that this HW monitor is being
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* used for. NULL when not actively in use and
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* non-NULL when in use.
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* @num_cores: Number of cores that are monitored by the
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* hardware monitor.
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* @core_stats: Array containing instruction count, memory
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* accesses and effective frequency for each core.
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*
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* One of dev or of_node needs to be specified for a successful registration.
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*
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*/
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struct memlat_hwmon {
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int (*start_hwmon)(struct memlat_hwmon *hw);
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void (*stop_hwmon)(struct memlat_hwmon *hw);
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unsigned long (*get_cnt)(struct memlat_hwmon *hw);
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struct device_node *(*get_child_of_node)(struct device *dev);
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struct device *dev;
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struct device_node *of_node;
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unsigned int num_cores;
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struct dev_stats *core_stats;
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struct devfreq *df;
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struct core_dev_map *freq_map;
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};
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#ifdef CONFIG_DEVFREQ_GOV_MEMLAT
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int register_memlat(struct device *dev, struct memlat_hwmon *hw);
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int register_compute(struct device *dev, struct memlat_hwmon *hw);
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int update_memlat(struct memlat_hwmon *hw);
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#else
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static inline int register_memlat(struct device *dev,
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struct memlat_hwmon *hw)
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{
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return 0;
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}
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static inline int register_compute(struct device *dev,
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struct memlat_hwmon *hw)
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{
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return 0;
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}
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static inline int update_memlat(struct memlat_hwmon *hw)
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{
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return 0;
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}
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#endif
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#endif /* _GOVERNOR_BW_HWMON_H */
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