1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2015 Linaro Ltd.
4 * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org>
5 */
6
7 #include <linux/clk-provider.h>
8 #include <linux/mfd/syscon.h>
9 #include <linux/slab.h>
10
11 #include "clk-mtk.h"
12 #include "clk-cpumux.h"
13
to_mtk_clk_cpumux(struct clk_hw * _hw)14 static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw)
15 {
16 return container_of(_hw, struct mtk_clk_cpumux, hw);
17 }
18
clk_cpumux_get_parent(struct clk_hw * hw)19 static u8 clk_cpumux_get_parent(struct clk_hw *hw)
20 {
21 struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
22 unsigned int val;
23
24 regmap_read(mux->regmap, mux->reg, &val);
25
26 val >>= mux->shift;
27 val &= mux->mask;
28
29 return val;
30 }
31
clk_cpumux_set_parent(struct clk_hw * hw,u8 index)32 static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index)
33 {
34 struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
35 u32 mask, val;
36
37 val = index << mux->shift;
38 mask = mux->mask << mux->shift;
39
40 return regmap_update_bits(mux->regmap, mux->reg, mask, val);
41 }
42
43 static const struct clk_ops clk_cpumux_ops = {
44 .get_parent = clk_cpumux_get_parent,
45 .set_parent = clk_cpumux_set_parent,
46 };
47
48 static struct clk *
mtk_clk_register_cpumux(const struct mtk_composite * mux,struct regmap * regmap)49 mtk_clk_register_cpumux(const struct mtk_composite *mux,
50 struct regmap *regmap)
51 {
52 struct mtk_clk_cpumux *cpumux;
53 struct clk *clk;
54 struct clk_init_data init;
55
56 cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL);
57 if (!cpumux)
58 return ERR_PTR(-ENOMEM);
59
60 init.name = mux->name;
61 init.ops = &clk_cpumux_ops;
62 init.parent_names = mux->parent_names;
63 init.num_parents = mux->num_parents;
64 init.flags = mux->flags;
65
66 cpumux->reg = mux->mux_reg;
67 cpumux->shift = mux->mux_shift;
68 cpumux->mask = BIT(mux->mux_width) - 1;
69 cpumux->regmap = regmap;
70 cpumux->hw.init = &init;
71
72 clk = clk_register(NULL, &cpumux->hw);
73 if (IS_ERR(clk))
74 kfree(cpumux);
75
76 return clk;
77 }
78
mtk_clk_register_cpumuxes(struct device_node * node,const struct mtk_composite * clks,int num,struct clk_onecell_data * clk_data)79 int mtk_clk_register_cpumuxes(struct device_node *node,
80 const struct mtk_composite *clks, int num,
81 struct clk_onecell_data *clk_data)
82 {
83 int i;
84 struct clk *clk;
85 struct regmap *regmap;
86
87 regmap = syscon_node_to_regmap(node);
88 if (IS_ERR(regmap)) {
89 pr_err("Cannot find regmap for %pOF: %ld\n", node,
90 PTR_ERR(regmap));
91 return PTR_ERR(regmap);
92 }
93
94 for (i = 0; i < num; i++) {
95 const struct mtk_composite *mux = &clks[i];
96
97 clk = mtk_clk_register_cpumux(mux, regmap);
98 if (IS_ERR(clk)) {
99 pr_err("Failed to register clk %s: %ld\n",
100 mux->name, PTR_ERR(clk));
101 continue;
102 }
103
104 clk_data->clks[mux->id] = clk;
105 }
106
107 return 0;
108 }
109