cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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clk-regmap-mux.c (1415B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2014, The Linux Foundation. All rights reserved.
      4 */
      5
      6#include <linux/kernel.h>
      7#include <linux/bitops.h>
      8#include <linux/regmap.h>
      9#include <linux/export.h>
     10
     11#include "clk-regmap-mux.h"
     12
     13static inline struct clk_regmap_mux *to_clk_regmap_mux(struct clk_hw *hw)
     14{
     15	return container_of(to_clk_regmap(hw), struct clk_regmap_mux, clkr);
     16}
     17
     18static u8 mux_get_parent(struct clk_hw *hw)
     19{
     20	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
     21	struct clk_regmap *clkr = to_clk_regmap(hw);
     22	unsigned int mask = GENMASK(mux->width - 1, 0);
     23	unsigned int val;
     24
     25	regmap_read(clkr->regmap, mux->reg, &val);
     26
     27	val >>= mux->shift;
     28	val &= mask;
     29
     30	if (mux->parent_map)
     31		return qcom_find_cfg_index(hw, mux->parent_map, val);
     32
     33	return val;
     34}
     35
     36static int mux_set_parent(struct clk_hw *hw, u8 index)
     37{
     38	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
     39	struct clk_regmap *clkr = to_clk_regmap(hw);
     40	unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
     41	unsigned int val;
     42
     43	if (mux->parent_map)
     44		index = mux->parent_map[index].cfg;
     45
     46	val = index;
     47	val <<= mux->shift;
     48
     49	return regmap_update_bits(clkr->regmap, mux->reg, mask, val);
     50}
     51
     52const struct clk_ops clk_regmap_mux_closest_ops = {
     53	.get_parent = mux_get_parent,
     54	.set_parent = mux_set_parent,
     55	.determine_rate = __clk_mux_determine_rate_closest,
     56};
     57EXPORT_SYMBOL_GPL(clk_regmap_mux_closest_ops);