summaryrefslogtreecommitdiff
path: root/drivers/clk/mediatek/clk-cpumux.c
blob: c11b3fae622e40b54d52fc493ccbc38e3baf3654 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015 Linaro Ltd.
 * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
 */

#include <linux/clk-provider.h>
#include <linux/container_of.h>
#include <linux/err.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/slab.h>

#include "clk-mtk.h"
#include "clk-cpumux.h"

struct mtk_clk_cpumux {
	struct clk_hw	hw;
	struct regmap	*regmap;
	u32		reg;
	u32		mask;
	u8		shift;
};

static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw)
{
	return container_of(_hw, struct mtk_clk_cpumux, hw);
}

static u8 clk_cpumux_get_parent(struct clk_hw *hw)
{
	struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
	unsigned int val;

	regmap_read(mux->regmap, mux->reg, &val);

	val >>= mux->shift;
	val &= mux->mask;

	return val;
}

static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index)
{
	struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
	u32 mask, val;

	val = index << mux->shift;
	mask = mux->mask << mux->shift;

	return regmap_update_bits(mux->regmap, mux->reg, mask, val);
}

static const struct clk_ops clk_cpumux_ops = {
	.get_parent = clk_cpumux_get_parent,
	.set_parent = clk_cpumux_set_parent,
};

static struct clk *
mtk_clk_register_cpumux(const struct mtk_composite *mux,
			struct regmap *regmap)
{
	struct mtk_clk_cpumux *cpumux;
	struct clk *clk;
	struct clk_init_data init;

	cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL);
	if (!cpumux)
		return ERR_PTR(-ENOMEM);

	init.name = mux->name;
	init.ops = &clk_cpumux_ops;
	init.parent_names = mux->parent_names;
	init.num_parents = mux->num_parents;
	init.flags = mux->flags;

	cpumux->reg = mux->mux_reg;
	cpumux->shift = mux->mux_shift;
	cpumux->mask = BIT(mux->mux_width) - 1;
	cpumux->regmap = regmap;
	cpumux->hw.init = &init;

	clk = clk_register(NULL, &cpumux->hw);
	if (IS_ERR(clk))
		kfree(cpumux);

	return clk;
}

static void mtk_clk_unregister_cpumux(struct clk *clk)
{
	struct mtk_clk_cpumux *cpumux;
	struct clk_hw *hw;

	hw = __clk_get_hw(clk);
	if (!hw)
		return;

	cpumux = to_mtk_clk_cpumux(hw);

	clk_unregister(clk);
	kfree(cpumux);
}

int mtk_clk_register_cpumuxes(struct device_node *node,
			      const struct mtk_composite *clks, int num,
			      struct clk_onecell_data *clk_data)
{
	int i;
	struct clk *clk;
	struct regmap *regmap;

	regmap = device_node_to_regmap(node);
	if (IS_ERR(regmap)) {
		pr_err("Cannot find regmap for %pOF: %pe\n", node, regmap);
		return PTR_ERR(regmap);
	}

	for (i = 0; i < num; i++) {
		const struct mtk_composite *mux = &clks[i];

		if (!IS_ERR_OR_NULL(clk_data->clks[mux->id])) {
			pr_warn("%pOF: Trying to register duplicate clock ID: %d\n",
				node, mux->id);
			continue;
		}

		clk = mtk_clk_register_cpumux(mux, regmap);
		if (IS_ERR(clk)) {
			pr_err("Failed to register clk %s: %pe\n", mux->name, clk);
			goto err;
		}

		clk_data->clks[mux->id] = clk;
	}

	return 0;

err:
	while (--i >= 0) {
		const struct mtk_composite *mux = &clks[i];

		if (IS_ERR_OR_NULL(clk_data->clks[mux->id]))
			continue;

		mtk_clk_unregister_cpumux(clk_data->clks[mux->id]);
		clk_data->clks[mux->id] = ERR_PTR(-ENOENT);
	}

	return PTR_ERR(clk);
}

void mtk_clk_unregister_cpumuxes(const struct mtk_composite *clks, int num,
				 struct clk_onecell_data *clk_data)
{
	int i;

	for (i = num; i > 0; i--) {
		const struct mtk_composite *mux = &clks[i - 1];

		if (IS_ERR_OR_NULL(clk_data->clks[mux->id]))
			continue;

		mtk_clk_unregister_cpumux(clk_data->clks[mux->id]);
		clk_data->clks[mux->id] = ERR_PTR(-ENOENT);
	}
}

MODULE_LICENSE("GPL");