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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 | ||
34 | struct max_gen_clk { | |
35 | struct regmap *regmap; | |
36 | u32 mask; | |
37 | u32 reg; | |
38 | struct clk_hw hw; | |
39 | }; | |
40 | ||
41 | static struct max_gen_clk *to_max_gen_clk(struct clk_hw *hw) | |
42 | { | |
43 | return container_of(hw, struct max_gen_clk, hw); | |
44 | } | |
45 | ||
46 | static int max_gen_clk_prepare(struct clk_hw *hw) | |
47 | { | |
48 | struct max_gen_clk *max_gen = to_max_gen_clk(hw); | |
49 | ||
50 | return regmap_update_bits(max_gen->regmap, max_gen->reg, | |
51 | max_gen->mask, max_gen->mask); | |
52 | } | |
53 | ||
54 | static void max_gen_clk_unprepare(struct clk_hw *hw) | |
55 | { | |
56 | struct max_gen_clk *max_gen = to_max_gen_clk(hw); | |
57 | ||
58 | regmap_update_bits(max_gen->regmap, max_gen->reg, | |
59 | max_gen->mask, ~max_gen->mask); | |
60 | } | |
61 | ||
62 | static int max_gen_clk_is_prepared(struct clk_hw *hw) | |
63 | { | |
64 | struct max_gen_clk *max_gen = to_max_gen_clk(hw); | |
65 | int ret; | |
66 | u32 val; | |
67 | ||
68 | ret = regmap_read(max_gen->regmap, max_gen->reg, &val); | |
69 | ||
70 | if (ret < 0) | |
71 | return -EINVAL; | |
72 | ||
73 | return val & max_gen->mask; | |
74 | } | |
75 | ||
76 | static unsigned long max_gen_recalc_rate(struct clk_hw *hw, | |
77 | unsigned long parent_rate) | |
78 | { | |
79 | return 32768; | |
80 | } | |
81 | ||
82 | struct clk_ops max_gen_clk_ops = { | |
83 | .prepare = max_gen_clk_prepare, | |
84 | .unprepare = max_gen_clk_unprepare, | |
85 | .is_prepared = max_gen_clk_is_prepared, | |
86 | .recalc_rate = max_gen_recalc_rate, | |
87 | }; | |
88 | EXPORT_SYMBOL_GPL(max_gen_clk_ops); | |
89 | ||
90 | static struct clk *max_gen_clk_register(struct device *dev, | |
91 | struct max_gen_clk *max_gen) | |
92 | { | |
93 | struct clk *clk; | |
94 | struct clk_hw *hw = &max_gen->hw; | |
95 | int ret; | |
96 | ||
97 | clk = devm_clk_register(dev, hw); | |
98 | if (IS_ERR(clk)) | |
99 | return clk; | |
100 | ||
101 | ret = clk_register_clkdev(clk, hw->init->name, NULL); | |
102 | ||
103 | if (ret) | |
104 | return ERR_PTR(ret); | |
105 | ||
106 | return clk; | |
107 | } | |
108 | ||
109 | int max_gen_clk_probe(struct platform_device *pdev, struct regmap *regmap, | |
110 | u32 reg, struct clk_init_data *clks_init, int num_init) | |
111 | { | |
112 | int i, ret; | |
113 | struct max_gen_clk *max_gen_clks; | |
114 | struct clk **clocks; | |
115 | struct device *dev = pdev->dev.parent; | |
116 | const char *clk_name; | |
117 | struct clk_init_data *init; | |
118 | ||
119 | clocks = devm_kzalloc(dev, sizeof(struct clk *) * num_init, GFP_KERNEL); | |
120 | if (!clocks) | |
121 | return -ENOMEM; | |
122 | ||
123 | max_gen_clks = devm_kzalloc(dev, sizeof(struct max_gen_clk) | |
124 | * num_init, GFP_KERNEL); | |
125 | if (!max_gen_clks) | |
126 | return -ENOMEM; | |
127 | ||
128 | for (i = 0; i < num_init; i++) { | |
129 | max_gen_clks[i].regmap = regmap; | |
130 | max_gen_clks[i].mask = 1 << i; | |
131 | max_gen_clks[i].reg = reg; | |
132 | ||
133 | init = devm_kzalloc(dev, sizeof(*init), GFP_KERNEL); | |
134 | if (!init) | |
135 | return -ENOMEM; | |
136 | ||
137 | if (dev->of_node && | |
138 | !of_property_read_string_index(dev->of_node, | |
139 | "clock-output-names", | |
140 | i, &clk_name)) | |
141 | init->name = clk_name; | |
142 | else | |
143 | init->name = clks_init[i].name; | |
144 | ||
145 | init->ops = clks_init[i].ops; | |
146 | init->flags = clks_init[i].flags; | |
147 | ||
148 | max_gen_clks[i].hw.init = init; | |
149 | ||
150 | clocks[i] = max_gen_clk_register(dev, &max_gen_clks[i]); | |
151 | if (IS_ERR(clocks[i])) { | |
152 | ret = PTR_ERR(clocks[i]); | |
153 | dev_err(dev, "failed to register %s\n", | |
154 | max_gen_clks[i].hw.init->name); | |
155 | return ret; | |
156 | } | |
157 | } | |
158 | ||
159 | platform_set_drvdata(pdev, clocks); | |
160 | ||
161 | if (dev->of_node) { | |
162 | struct clk_onecell_data *of_data; | |
163 | ||
164 | of_data = devm_kzalloc(dev, sizeof(*of_data), GFP_KERNEL); | |
165 | if (!of_data) | |
166 | return -ENOMEM; | |
167 | ||
168 | of_data->clks = clocks; | |
169 | of_data->clk_num = num_init; | |
170 | ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, | |
171 | of_data); | |
172 | ||
173 | if (ret) { | |
174 | dev_err(dev, "failed to register OF clock provider\n"); | |
175 | return ret; | |
176 | } | |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | EXPORT_SYMBOL_GPL(max_gen_clk_probe); | |
182 | ||
183 | int max_gen_clk_remove(struct platform_device *pdev, int num_init) | |
184 | { | |
185 | struct device *dev = pdev->dev.parent; | |
186 | ||
187 | if (dev->of_node) | |
188 | of_clk_del_provider(dev->of_node); | |
189 | ||
190 | return 0; | |
191 | } | |
192 | EXPORT_SYMBOL_GPL(max_gen_clk_remove); |