1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
2734d82f4SMasahiro Yamada /*
3734d82f4SMasahiro Yamada * Copyright (C) 2016 Socionext Inc.
4734d82f4SMasahiro Yamada * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
5734d82f4SMasahiro Yamada */
6734d82f4SMasahiro Yamada
7734d82f4SMasahiro Yamada #include <linux/clk-provider.h>
8734d82f4SMasahiro Yamada #include <linux/device.h>
9734d82f4SMasahiro Yamada #include <linux/regmap.h>
10734d82f4SMasahiro Yamada
11734d82f4SMasahiro Yamada #include "clk-uniphier.h"
12734d82f4SMasahiro Yamada
13734d82f4SMasahiro Yamada struct uniphier_clk_mux {
14734d82f4SMasahiro Yamada struct clk_hw hw;
15734d82f4SMasahiro Yamada struct regmap *regmap;
16734d82f4SMasahiro Yamada unsigned int reg;
17734d82f4SMasahiro Yamada const unsigned int *masks;
18734d82f4SMasahiro Yamada const unsigned int *vals;
19734d82f4SMasahiro Yamada };
20734d82f4SMasahiro Yamada
21734d82f4SMasahiro Yamada #define to_uniphier_clk_mux(_hw) container_of(_hw, struct uniphier_clk_mux, hw)
22734d82f4SMasahiro Yamada
uniphier_clk_mux_set_parent(struct clk_hw * hw,u8 index)23734d82f4SMasahiro Yamada static int uniphier_clk_mux_set_parent(struct clk_hw *hw, u8 index)
24734d82f4SMasahiro Yamada {
25734d82f4SMasahiro Yamada struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
26734d82f4SMasahiro Yamada
27734d82f4SMasahiro Yamada return regmap_write_bits(mux->regmap, mux->reg, mux->masks[index],
28734d82f4SMasahiro Yamada mux->vals[index]);
29734d82f4SMasahiro Yamada }
30734d82f4SMasahiro Yamada
uniphier_clk_mux_get_parent(struct clk_hw * hw)31734d82f4SMasahiro Yamada static u8 uniphier_clk_mux_get_parent(struct clk_hw *hw)
32734d82f4SMasahiro Yamada {
33734d82f4SMasahiro Yamada struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
34*f6b1340dSColin Ian King unsigned int num_parents = clk_hw_get_num_parents(hw);
35734d82f4SMasahiro Yamada int ret;
36c0ce317fSMasahiro Yamada unsigned int val;
37*f6b1340dSColin Ian King unsigned int i;
38734d82f4SMasahiro Yamada
39734d82f4SMasahiro Yamada ret = regmap_read(mux->regmap, mux->reg, &val);
40734d82f4SMasahiro Yamada if (ret)
41734d82f4SMasahiro Yamada return ret;
42734d82f4SMasahiro Yamada
43734d82f4SMasahiro Yamada for (i = 0; i < num_parents; i++)
44734d82f4SMasahiro Yamada if ((mux->masks[i] & val) == mux->vals[i])
45734d82f4SMasahiro Yamada return i;
46734d82f4SMasahiro Yamada
47734d82f4SMasahiro Yamada return -EINVAL;
48734d82f4SMasahiro Yamada }
49734d82f4SMasahiro Yamada
50734d82f4SMasahiro Yamada static const struct clk_ops uniphier_clk_mux_ops = {
51734d82f4SMasahiro Yamada .determine_rate = __clk_mux_determine_rate,
52734d82f4SMasahiro Yamada .set_parent = uniphier_clk_mux_set_parent,
53734d82f4SMasahiro Yamada .get_parent = uniphier_clk_mux_get_parent,
54734d82f4SMasahiro Yamada };
55734d82f4SMasahiro Yamada
uniphier_clk_register_mux(struct device * dev,struct regmap * regmap,const char * name,const struct uniphier_clk_mux_data * data)56734d82f4SMasahiro Yamada struct clk_hw *uniphier_clk_register_mux(struct device *dev,
57734d82f4SMasahiro Yamada struct regmap *regmap,
58734d82f4SMasahiro Yamada const char *name,
59734d82f4SMasahiro Yamada const struct uniphier_clk_mux_data *data)
60734d82f4SMasahiro Yamada {
61734d82f4SMasahiro Yamada struct uniphier_clk_mux *mux;
62734d82f4SMasahiro Yamada struct clk_init_data init;
63734d82f4SMasahiro Yamada int ret;
64734d82f4SMasahiro Yamada
65734d82f4SMasahiro Yamada mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
66734d82f4SMasahiro Yamada if (!mux)
67734d82f4SMasahiro Yamada return ERR_PTR(-ENOMEM);
68734d82f4SMasahiro Yamada
69734d82f4SMasahiro Yamada init.name = name;
70734d82f4SMasahiro Yamada init.ops = &uniphier_clk_mux_ops;
71734d82f4SMasahiro Yamada init.flags = CLK_SET_RATE_PARENT;
72734d82f4SMasahiro Yamada init.parent_names = data->parent_names;
734f8a13e1SJulia Lawall init.num_parents = data->num_parents;
74734d82f4SMasahiro Yamada
75734d82f4SMasahiro Yamada mux->regmap = regmap;
76734d82f4SMasahiro Yamada mux->reg = data->reg;
77734d82f4SMasahiro Yamada mux->masks = data->masks;
78734d82f4SMasahiro Yamada mux->vals = data->vals;
79734d82f4SMasahiro Yamada mux->hw.init = &init;
80734d82f4SMasahiro Yamada
81734d82f4SMasahiro Yamada ret = devm_clk_hw_register(dev, &mux->hw);
82734d82f4SMasahiro Yamada if (ret)
83734d82f4SMasahiro Yamada return ERR_PTR(ret);
84734d82f4SMasahiro Yamada
85734d82f4SMasahiro Yamada return &mux->hw;
86734d82f4SMasahiro Yamada }
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