1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2016 Socionext Inc.
4 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
5 */
6
7#include <linux/clk-provider.h>
8#include <linux/device.h>
9#include <linux/regmap.h>
10
11#include "clk-uniphier.h"
12
13struct uniphier_clk_mux {
14 struct clk_hw hw;
15 struct regmap *regmap;
16 unsigned int reg;
17 const unsigned int *masks;
18 const unsigned int *vals;
19};
20
21#define to_uniphier_clk_mux(_hw) container_of(_hw, struct uniphier_clk_mux, hw)
22
23static int uniphier_clk_mux_set_parent(struct clk_hw *hw, u8 index)
24{
25 struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
26
27 return regmap_write_bits(map: mux->regmap, reg: mux->reg, mask: mux->masks[index],
28 val: mux->vals[index]);
29}
30
31static u8 uniphier_clk_mux_get_parent(struct clk_hw *hw)
32{
33 struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
34 unsigned int num_parents = clk_hw_get_num_parents(hw);
35 int ret;
36 unsigned int val;
37 unsigned int i;
38
39 ret = regmap_read(map: mux->regmap, reg: mux->reg, val: &val);
40 if (ret)
41 return ret;
42
43 for (i = 0; i < num_parents; i++)
44 if ((mux->masks[i] & val) == mux->vals[i])
45 return i;
46
47 return -EINVAL;
48}
49
50static const struct clk_ops uniphier_clk_mux_ops = {
51 .determine_rate = __clk_mux_determine_rate,
52 .set_parent = uniphier_clk_mux_set_parent,
53 .get_parent = uniphier_clk_mux_get_parent,
54};
55
56struct clk_hw *uniphier_clk_register_mux(struct device *dev,
57 struct regmap *regmap,
58 const char *name,
59 const struct uniphier_clk_mux_data *data)
60{
61 struct uniphier_clk_mux *mux;
62 struct clk_init_data init;
63 int ret;
64
65 mux = devm_kzalloc(dev, size: sizeof(*mux), GFP_KERNEL);
66 if (!mux)
67 return ERR_PTR(error: -ENOMEM);
68
69 init.name = name;
70 init.ops = &uniphier_clk_mux_ops;
71 init.flags = CLK_SET_RATE_PARENT;
72 init.parent_names = data->parent_names;
73 init.num_parents = data->num_parents;
74
75 mux->regmap = regmap;
76 mux->reg = data->reg;
77 mux->masks = data->masks;
78 mux->vals = data->vals;
79 mux->hw.init = &init;
80
81 ret = devm_clk_hw_register(dev, hw: &mux->hw);
82 if (ret)
83 return ERR_PTR(error: ret);
84
85 return &mux->hw;
86}
87

source code of linux/drivers/clk/uniphier/clk-uniphier-mux.c