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73118e61 JL |
1 | /* |
2 | * clk-max77686.c - Clock driver for Maxim 77686 | |
3 | * | |
4 | * Copyright (C) 2012 Samsung Electornics | |
5 | * Jonghwa Lee <jonghwa3.lee@samsung.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2 of the License, or (at your | |
10 | * option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/kernel.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/mfd/max77686.h> | |
28 | #include <linux/mfd/max77686-private.h> | |
29 | #include <linux/clk-provider.h> | |
30 | #include <linux/mutex.h> | |
31 | #include <linux/clkdev.h> | |
32 | ||
33 | enum { | |
34 | MAX77686_CLK_AP = 0, | |
35 | MAX77686_CLK_CP, | |
36 | MAX77686_CLK_PMIC, | |
37 | MAX77686_CLKS_NUM, | |
38 | }; | |
39 | ||
40 | struct max77686_clk { | |
41 | struct max77686_dev *iodev; | |
42 | u32 mask; | |
43 | struct clk_hw hw; | |
44 | struct clk_lookup *lookup; | |
45 | }; | |
46 | ||
3fe296cf | 47 | static struct max77686_clk *to_max77686_clk(struct clk_hw *hw) |
73118e61 JL |
48 | { |
49 | return container_of(hw, struct max77686_clk, hw); | |
50 | } | |
51 | ||
52 | static int max77686_clk_prepare(struct clk_hw *hw) | |
53 | { | |
3fe296cf | 54 | struct max77686_clk *max77686 = to_max77686_clk(hw); |
73118e61 | 55 | |
3fe296cf AL |
56 | return regmap_update_bits(max77686->iodev->regmap, |
57 | MAX77686_REG_32KHZ, max77686->mask, | |
58 | max77686->mask); | |
73118e61 JL |
59 | } |
60 | ||
61 | static void max77686_clk_unprepare(struct clk_hw *hw) | |
62 | { | |
3fe296cf | 63 | struct max77686_clk *max77686 = to_max77686_clk(hw); |
73118e61 JL |
64 | |
65 | regmap_update_bits(max77686->iodev->regmap, | |
66 | MAX77686_REG_32KHZ, max77686->mask, ~max77686->mask); | |
67 | } | |
68 | ||
69 | static int max77686_clk_is_enabled(struct clk_hw *hw) | |
70 | { | |
3fe296cf | 71 | struct max77686_clk *max77686 = to_max77686_clk(hw); |
73118e61 JL |
72 | int ret; |
73 | u32 val; | |
74 | ||
73118e61 JL |
75 | ret = regmap_read(max77686->iodev->regmap, |
76 | MAX77686_REG_32KHZ, &val); | |
77 | ||
78 | if (ret < 0) | |
79 | return -EINVAL; | |
80 | ||
81 | return val & max77686->mask; | |
82 | } | |
83 | ||
84 | static struct clk_ops max77686_clk_ops = { | |
85 | .prepare = max77686_clk_prepare, | |
86 | .unprepare = max77686_clk_unprepare, | |
87 | .is_enabled = max77686_clk_is_enabled, | |
88 | }; | |
89 | ||
90 | static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = { | |
91 | [MAX77686_CLK_AP] = { | |
92 | .name = "32khz_ap", | |
93 | .ops = &max77686_clk_ops, | |
94 | .flags = CLK_IS_ROOT, | |
95 | }, | |
96 | [MAX77686_CLK_CP] = { | |
97 | .name = "32khz_cp", | |
98 | .ops = &max77686_clk_ops, | |
99 | .flags = CLK_IS_ROOT, | |
100 | }, | |
101 | [MAX77686_CLK_PMIC] = { | |
102 | .name = "32khz_pmic", | |
103 | .ops = &max77686_clk_ops, | |
104 | .flags = CLK_IS_ROOT, | |
105 | }, | |
106 | }; | |
107 | ||
108 | static int max77686_clk_register(struct device *dev, | |
109 | struct max77686_clk *max77686) | |
110 | { | |
111 | struct clk *clk; | |
112 | struct clk_hw *hw = &max77686->hw; | |
113 | ||
114 | clk = clk_register(dev, hw); | |
115 | ||
116 | if (IS_ERR(clk)) | |
117 | return -ENOMEM; | |
118 | ||
f1ba28a1 | 119 | max77686->lookup = kzalloc(sizeof(struct clk_lookup), GFP_KERNEL); |
9f58b9b9 | 120 | if (!max77686->lookup) |
73118e61 JL |
121 | return -ENOMEM; |
122 | ||
123 | max77686->lookup->con_id = hw->init->name; | |
124 | max77686->lookup->clk = clk; | |
125 | ||
126 | clkdev_add(max77686->lookup); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
018ae93f | 131 | static int max77686_clk_probe(struct platform_device *pdev) |
73118e61 JL |
132 | { |
133 | struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
134 | struct max77686_clk **max77686_clks; | |
135 | int i, ret; | |
136 | ||
137 | max77686_clks = devm_kzalloc(&pdev->dev, sizeof(struct max77686_clk *) | |
138 | * MAX77686_CLKS_NUM, GFP_KERNEL); | |
9f58b9b9 | 139 | if (!max77686_clks) |
73118e61 JL |
140 | return -ENOMEM; |
141 | ||
142 | for (i = 0; i < MAX77686_CLKS_NUM; i++) { | |
143 | max77686_clks[i] = devm_kzalloc(&pdev->dev, | |
144 | sizeof(struct max77686_clk), GFP_KERNEL); | |
9f58b9b9 | 145 | if (!max77686_clks[i]) |
73118e61 JL |
146 | return -ENOMEM; |
147 | } | |
148 | ||
149 | for (i = 0; i < MAX77686_CLKS_NUM; i++) { | |
150 | max77686_clks[i]->iodev = iodev; | |
151 | max77686_clks[i]->mask = 1 << i; | |
152 | max77686_clks[i]->hw.init = &max77686_clks_init[i]; | |
153 | ||
154 | ret = max77686_clk_register(&pdev->dev, max77686_clks[i]); | |
155 | if (ret) { | |
156 | switch (i) { | |
157 | case MAX77686_CLK_AP: | |
158 | dev_err(&pdev->dev, "Fail to register CLK_AP\n"); | |
159 | goto err_clk_ap; | |
160 | break; | |
161 | case MAX77686_CLK_CP: | |
162 | dev_err(&pdev->dev, "Fail to register CLK_CP\n"); | |
163 | goto err_clk_cp; | |
164 | break; | |
165 | case MAX77686_CLK_PMIC: | |
166 | dev_err(&pdev->dev, "Fail to register CLK_PMIC\n"); | |
167 | goto err_clk_pmic; | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
172 | platform_set_drvdata(pdev, max77686_clks); | |
173 | ||
174 | goto out; | |
175 | ||
176 | err_clk_pmic: | |
177 | clkdev_drop(max77686_clks[MAX77686_CLK_CP]->lookup); | |
178 | kfree(max77686_clks[MAX77686_CLK_CP]->hw.clk); | |
179 | err_clk_cp: | |
180 | clkdev_drop(max77686_clks[MAX77686_CLK_AP]->lookup); | |
181 | kfree(max77686_clks[MAX77686_CLK_AP]->hw.clk); | |
182 | err_clk_ap: | |
183 | out: | |
184 | return ret; | |
185 | } | |
186 | ||
1fc7ad5d | 187 | static int max77686_clk_remove(struct platform_device *pdev) |
73118e61 JL |
188 | { |
189 | struct max77686_clk **max77686_clks = platform_get_drvdata(pdev); | |
190 | int i; | |
191 | ||
192 | for (i = 0; i < MAX77686_CLKS_NUM; i++) { | |
193 | clkdev_drop(max77686_clks[i]->lookup); | |
194 | kfree(max77686_clks[i]->hw.clk); | |
195 | } | |
196 | return 0; | |
197 | } | |
198 | ||
199 | static const struct platform_device_id max77686_clk_id[] = { | |
200 | { "max77686-clk", 0}, | |
201 | { }, | |
202 | }; | |
203 | MODULE_DEVICE_TABLE(platform, max77686_clk_id); | |
204 | ||
205 | static struct platform_driver max77686_clk_driver = { | |
206 | .driver = { | |
207 | .name = "max77686-clk", | |
208 | .owner = THIS_MODULE, | |
209 | }, | |
210 | .probe = max77686_clk_probe, | |
f9cfa630 | 211 | .remove = max77686_clk_remove, |
73118e61 JL |
212 | .id_table = max77686_clk_id, |
213 | }; | |
214 | ||
215 | static int __init max77686_clk_init(void) | |
216 | { | |
217 | return platform_driver_register(&max77686_clk_driver); | |
218 | } | |
219 | subsys_initcall(max77686_clk_init); | |
220 | ||
221 | static void __init max77686_clk_cleanup(void) | |
222 | { | |
223 | platform_driver_unregister(&max77686_clk_driver); | |
224 | } | |
225 | module_exit(max77686_clk_cleanup); | |
226 | ||
227 | MODULE_DESCRIPTION("MAXIM 77686 Clock Driver"); | |
228 | MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); | |
229 | MODULE_LICENSE("GPL"); |