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(mux->regmap, mux->reg, mux->masks[index],
28				 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(mux->regmap, mux->reg, &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, sizeof(*mux), GFP_KERNEL);
66	if (!mux)
67		return ERR_PTR(-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, &mux->hw);
82	if (ret)
83		return ERR_PTR(ret);
84
85	return &mux->hw;
86}
87