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5dbbb00f JMC |
1 | /* |
2 | * clk-max-gen.c - Generic clock driver for Maxim PMICs clocks | |
3 | * | |
4 | * Copyright (C) 2014 Google, Inc | |
5 | * | |
6 | * Copyright (C) 2012 Samsung Electornics | |
7 | * Jonghwa Lee <jonghwa3.lee@samsung.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation; either version 2 of the License, or (at your | |
12 | * option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * This driver is based on clk-max77686.c | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/regmap.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/clk-provider.h> | |
29 | #include <linux/mutex.h> | |
30 | #include <linux/clkdev.h> | |
31 | #include <linux/of.h> | |
32 | #include <linux/export.h> | |
33 | ||
9a39222d SB |
34 | #include "clk-max-gen.h" |
35 | ||
5dbbb00f JMC |
36 | struct max_gen_clk { |
37 | struct regmap *regmap; | |
38 | u32 mask; | |
39 | u32 reg; | |
40 | struct clk_hw hw; | |
41 | }; | |
42 | ||
43 | static struct max_gen_clk *to_max_gen_clk(struct clk_hw *hw) | |
44 | { | |
45 | return container_of(hw, struct max_gen_clk, hw); | |
46 | } | |
47 | ||
48 | static int max_gen_clk_prepare(struct clk_hw *hw) | |
49 | { | |
50 | struct max_gen_clk *max_gen = to_max_gen_clk(hw); | |
51 | ||
52 | return regmap_update_bits(max_gen->regmap, max_gen->reg, | |
53 | max_gen->mask, max_gen->mask); | |
54 | } | |
55 | ||
56 | static void max_gen_clk_unprepare(struct clk_hw *hw) | |
57 | { | |
58 | struct max_gen_clk *max_gen = to_max_gen_clk(hw); | |
59 | ||
60 | regmap_update_bits(max_gen->regmap, max_gen->reg, | |
61 | max_gen->mask, ~max_gen->mask); | |
62 | } | |
63 | ||
64 | static int max_gen_clk_is_prepared(struct clk_hw *hw) | |
65 | { | |
66 | struct max_gen_clk *max_gen = to_max_gen_clk(hw); | |
67 | int ret; | |
68 | u32 val; | |
69 | ||
70 | ret = regmap_read(max_gen->regmap, max_gen->reg, &val); | |
71 | ||
72 | if (ret < 0) | |
73 | return -EINVAL; | |
74 | ||
75 | return val & max_gen->mask; | |
76 | } | |
77 | ||
78 | static unsigned long max_gen_recalc_rate(struct clk_hw *hw, | |
79 | unsigned long parent_rate) | |
80 | { | |
81 | return 32768; | |
82 | } | |
83 | ||
84 | struct clk_ops max_gen_clk_ops = { | |
85 | .prepare = max_gen_clk_prepare, | |
86 | .unprepare = max_gen_clk_unprepare, | |
87 | .is_prepared = max_gen_clk_is_prepared, | |
88 | .recalc_rate = max_gen_recalc_rate, | |
89 | }; | |
90 | EXPORT_SYMBOL_GPL(max_gen_clk_ops); | |
91 | ||
92 | static struct clk *max_gen_clk_register(struct device *dev, | |
93 | struct max_gen_clk *max_gen) | |
94 | { | |
95 | struct clk *clk; | |
96 | struct clk_hw *hw = &max_gen->hw; | |
97 | int ret; | |
98 | ||
99 | clk = devm_clk_register(dev, hw); | |
100 | if (IS_ERR(clk)) | |
101 | return clk; | |
102 | ||
103 | ret = clk_register_clkdev(clk, hw->init->name, NULL); | |
104 | ||
105 | if (ret) | |
106 | return ERR_PTR(ret); | |
107 | ||
108 | return clk; | |
109 | } | |
110 | ||
111 | int max_gen_clk_probe(struct platform_device *pdev, struct regmap *regmap, | |
112 | u32 reg, struct clk_init_data *clks_init, int num_init) | |
113 | { | |
114 | int i, ret; | |
115 | struct max_gen_clk *max_gen_clks; | |
116 | struct clk **clocks; | |
117 | struct device *dev = pdev->dev.parent; | |
118 | const char *clk_name; | |
119 | struct clk_init_data *init; | |
120 | ||
121 | clocks = devm_kzalloc(dev, sizeof(struct clk *) * num_init, GFP_KERNEL); | |
122 | if (!clocks) | |
123 | return -ENOMEM; | |
124 | ||
125 | max_gen_clks = devm_kzalloc(dev, sizeof(struct max_gen_clk) | |
126 | * num_init, GFP_KERNEL); | |
127 | if (!max_gen_clks) | |
128 | return -ENOMEM; | |
129 | ||
130 | for (i = 0; i < num_init; i++) { | |
131 | max_gen_clks[i].regmap = regmap; | |
132 | max_gen_clks[i].mask = 1 << i; | |
133 | max_gen_clks[i].reg = reg; | |
134 | ||
135 | init = devm_kzalloc(dev, sizeof(*init), GFP_KERNEL); | |
136 | if (!init) | |
137 | return -ENOMEM; | |
138 | ||
139 | if (dev->of_node && | |
140 | !of_property_read_string_index(dev->of_node, | |
141 | "clock-output-names", | |
142 | i, &clk_name)) | |
143 | init->name = clk_name; | |
144 | else | |
145 | init->name = clks_init[i].name; | |
146 | ||
147 | init->ops = clks_init[i].ops; | |
148 | init->flags = clks_init[i].flags; | |
149 | ||
150 | max_gen_clks[i].hw.init = init; | |
151 | ||
152 | clocks[i] = max_gen_clk_register(dev, &max_gen_clks[i]); | |
153 | if (IS_ERR(clocks[i])) { | |
154 | ret = PTR_ERR(clocks[i]); | |
155 | dev_err(dev, "failed to register %s\n", | |
156 | max_gen_clks[i].hw.init->name); | |
157 | return ret; | |
158 | } | |
159 | } | |
160 | ||
161 | platform_set_drvdata(pdev, clocks); | |
162 | ||
163 | if (dev->of_node) { | |
164 | struct clk_onecell_data *of_data; | |
165 | ||
166 | of_data = devm_kzalloc(dev, sizeof(*of_data), GFP_KERNEL); | |
167 | if (!of_data) | |
168 | return -ENOMEM; | |
169 | ||
170 | of_data->clks = clocks; | |
171 | of_data->clk_num = num_init; | |
172 | ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, | |
173 | of_data); | |
174 | ||
175 | if (ret) { | |
176 | dev_err(dev, "failed to register OF clock provider\n"); | |
177 | return ret; | |
178 | } | |
179 | } | |
180 | ||
181 | return 0; | |
182 | } | |
183 | EXPORT_SYMBOL_GPL(max_gen_clk_probe); | |
184 | ||
185 | int max_gen_clk_remove(struct platform_device *pdev, int num_init) | |
186 | { | |
187 | struct device *dev = pdev->dev.parent; | |
188 | ||
189 | if (dev->of_node) | |
190 | of_clk_del_provider(dev->of_node); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | EXPORT_SYMBOL_GPL(max_gen_clk_remove); |