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 
13 static 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 
18 static 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 
36 static 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 
52 const 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 };
57 EXPORT_SYMBOL_GPL(clk_regmap_mux_closest_ops);
58