5ea428595c
The Adaptive Supply Voltage (ASV) driver adjusts CPU cluster operating points depending on exact revision of an SoC retrieved from the CHIPID block or the OTP memory. This allows for some power saving as for some CPU clock frequencies we can lower CPU cluster's supply voltage comparing to safe values common to all the SoC revisions. This patch adds support for Exynos5422/5800 SoC, it is partially based on code from https://github.com/hardkernel/linux repository, branch odroidxu4-4.14.y, files: arch/arm/mach-exynos/exynos5422-asv.[ch]. Tested on Odroid XU3, XU4, XU3 Lite. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
72 lines
1.7 KiB
C
72 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2019 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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* Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
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*
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* Samsung Exynos SoC Adaptive Supply Voltage support
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*/
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#ifndef __LINUX_SOC_EXYNOS_ASV_H
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#define __LINUX_SOC_EXYNOS_ASV_H
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struct regmap;
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/* HPM, IDS values to select target group */
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struct asv_limit_entry {
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unsigned int hpm;
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unsigned int ids;
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};
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struct exynos_asv_table {
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unsigned int num_rows;
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unsigned int num_cols;
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u32 *buf;
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};
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struct exynos_asv_subsys {
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struct exynos_asv *asv;
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const char *cpu_dt_compat;
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int id;
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struct exynos_asv_table table;
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unsigned int base_volt;
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unsigned int offset_volt_h;
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unsigned int offset_volt_l;
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};
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struct exynos_asv {
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struct device *dev;
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struct regmap *chipid_regmap;
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struct exynos_asv_subsys subsys[2];
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int (*opp_get_voltage)(const struct exynos_asv_subsys *subs,
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int level, unsigned int voltage);
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unsigned int group;
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unsigned int table;
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/* True if SG fields from PKG_ID register should be used */
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bool use_sg;
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/* ASV bin read from DT */
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int of_bin;
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};
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static inline u32 __asv_get_table_entry(const struct exynos_asv_table *table,
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unsigned int row, unsigned int col)
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{
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return table->buf[row * (table->num_cols) + col];
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}
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static inline u32 exynos_asv_opp_get_voltage(const struct exynos_asv_subsys *subsys,
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unsigned int level, unsigned int group)
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{
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return __asv_get_table_entry(&subsys->table, level, group + 1);
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}
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static inline u32 exynos_asv_opp_get_frequency(const struct exynos_asv_subsys *subsys,
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unsigned int level)
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{
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return __asv_get_table_entry(&subsys->table, level, 0);
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}
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#endif /* __LINUX_SOC_EXYNOS_ASV_H */
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