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Jonghwa Lee73118e62012-08-28 17:54:28 +09001/*
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
33enum {
34 MAX77686_CLK_AP = 0,
35 MAX77686_CLK_CP,
36 MAX77686_CLK_PMIC,
37 MAX77686_CLKS_NUM,
38};
39
40struct max77686_clk {
41 struct max77686_dev *iodev;
42 u32 mask;
43 struct clk_hw hw;
44 struct clk_lookup *lookup;
45};
46
47static struct max77686_clk *get_max77686_clk(struct clk_hw *hw)
48{
49 return container_of(hw, struct max77686_clk, hw);
50}
51
52static int max77686_clk_prepare(struct clk_hw *hw)
53{
54 struct max77686_clk *max77686;
55 int ret;
56
57 max77686 = get_max77686_clk(hw);
58 if (!max77686)
59 return -ENOMEM;
60
61 ret = regmap_update_bits(max77686->iodev->regmap,
62 MAX77686_REG_32KHZ, max77686->mask, max77686->mask);
63
64 return ret;
65}
66
67static void max77686_clk_unprepare(struct clk_hw *hw)
68{
69 struct max77686_clk *max77686;
70
71 max77686 = get_max77686_clk(hw);
72 if (!max77686)
73 return;
74
75 regmap_update_bits(max77686->iodev->regmap,
76 MAX77686_REG_32KHZ, max77686->mask, ~max77686->mask);
77}
78
79static int max77686_clk_is_enabled(struct clk_hw *hw)
80{
81 struct max77686_clk *max77686;
82 int ret;
83 u32 val;
84
85 max77686 = get_max77686_clk(hw);
86 if (!max77686)
87 return -ENOMEM;
88
89 ret = regmap_read(max77686->iodev->regmap,
90 MAX77686_REG_32KHZ, &val);
91
92 if (ret < 0)
93 return -EINVAL;
94
95 return val & max77686->mask;
96}
97
98static struct clk_ops max77686_clk_ops = {
99 .prepare = max77686_clk_prepare,
100 .unprepare = max77686_clk_unprepare,
101 .is_enabled = max77686_clk_is_enabled,
102};
103
104static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = {
105 [MAX77686_CLK_AP] = {
106 .name = "32khz_ap",
107 .ops = &max77686_clk_ops,
108 .flags = CLK_IS_ROOT,
109 },
110 [MAX77686_CLK_CP] = {
111 .name = "32khz_cp",
112 .ops = &max77686_clk_ops,
113 .flags = CLK_IS_ROOT,
114 },
115 [MAX77686_CLK_PMIC] = {
116 .name = "32khz_pmic",
117 .ops = &max77686_clk_ops,
118 .flags = CLK_IS_ROOT,
119 },
120};
121
122static int max77686_clk_register(struct device *dev,
123 struct max77686_clk *max77686)
124{
125 struct clk *clk;
126 struct clk_hw *hw = &max77686->hw;
127
128 clk = clk_register(dev, hw);
129
130 if (IS_ERR(clk))
131 return -ENOMEM;
132
133 max77686->lookup = devm_kzalloc(dev, sizeof(struct clk_lookup),
134 GFP_KERNEL);
135 if (IS_ERR(max77686->lookup))
136 return -ENOMEM;
137
138 max77686->lookup->con_id = hw->init->name;
139 max77686->lookup->clk = clk;
140
141 clkdev_add(max77686->lookup);
142
143 return 0;
144}
145
Bill Pemberton018ae932012-11-19 13:22:52 -0500146static int max77686_clk_probe(struct platform_device *pdev)
Jonghwa Lee73118e62012-08-28 17:54:28 +0900147{
148 struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
149 struct max77686_clk **max77686_clks;
150 int i, ret;
151
152 max77686_clks = devm_kzalloc(&pdev->dev, sizeof(struct max77686_clk *)
153 * MAX77686_CLKS_NUM, GFP_KERNEL);
154 if (IS_ERR(max77686_clks))
155 return -ENOMEM;
156
157 for (i = 0; i < MAX77686_CLKS_NUM; i++) {
158 max77686_clks[i] = devm_kzalloc(&pdev->dev,
159 sizeof(struct max77686_clk), GFP_KERNEL);
160 if (IS_ERR(max77686_clks[i]))
161 return -ENOMEM;
162 }
163
164 for (i = 0; i < MAX77686_CLKS_NUM; i++) {
165 max77686_clks[i]->iodev = iodev;
166 max77686_clks[i]->mask = 1 << i;
167 max77686_clks[i]->hw.init = &max77686_clks_init[i];
168
169 ret = max77686_clk_register(&pdev->dev, max77686_clks[i]);
170 if (ret) {
171 switch (i) {
172 case MAX77686_CLK_AP:
173 dev_err(&pdev->dev, "Fail to register CLK_AP\n");
174 goto err_clk_ap;
175 break;
176 case MAX77686_CLK_CP:
177 dev_err(&pdev->dev, "Fail to register CLK_CP\n");
178 goto err_clk_cp;
179 break;
180 case MAX77686_CLK_PMIC:
181 dev_err(&pdev->dev, "Fail to register CLK_PMIC\n");
182 goto err_clk_pmic;
183 }
184 }
185 }
186
187 platform_set_drvdata(pdev, max77686_clks);
188
189 goto out;
190
191err_clk_pmic:
192 clkdev_drop(max77686_clks[MAX77686_CLK_CP]->lookup);
193 kfree(max77686_clks[MAX77686_CLK_CP]->hw.clk);
194err_clk_cp:
195 clkdev_drop(max77686_clks[MAX77686_CLK_AP]->lookup);
196 kfree(max77686_clks[MAX77686_CLK_AP]->hw.clk);
197err_clk_ap:
198out:
199 return ret;
200}
201
Bill Pemberton1fc7ad52012-11-19 13:25:43 -0500202static int max77686_clk_remove(struct platform_device *pdev)
Jonghwa Lee73118e62012-08-28 17:54:28 +0900203{
204 struct max77686_clk **max77686_clks = platform_get_drvdata(pdev);
205 int i;
206
207 for (i = 0; i < MAX77686_CLKS_NUM; i++) {
208 clkdev_drop(max77686_clks[i]->lookup);
209 kfree(max77686_clks[i]->hw.clk);
210 }
211 return 0;
212}
213
214static const struct platform_device_id max77686_clk_id[] = {
215 { "max77686-clk", 0},
216 { },
217};
218MODULE_DEVICE_TABLE(platform, max77686_clk_id);
219
220static struct platform_driver max77686_clk_driver = {
221 .driver = {
222 .name = "max77686-clk",
223 .owner = THIS_MODULE,
224 },
225 .probe = max77686_clk_probe,
Bill Pembertonf9cfa632012-11-19 13:19:59 -0500226 .remove = max77686_clk_remove,
Jonghwa Lee73118e62012-08-28 17:54:28 +0900227 .id_table = max77686_clk_id,
228};
229
230static int __init max77686_clk_init(void)
231{
232 return platform_driver_register(&max77686_clk_driver);
233}
234subsys_initcall(max77686_clk_init);
235
236static void __init max77686_clk_cleanup(void)
237{
238 platform_driver_unregister(&max77686_clk_driver);
239}
240module_exit(max77686_clk_cleanup);
241
242MODULE_DESCRIPTION("MAXIM 77686 Clock Driver");
243MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");
244MODULE_LICENSE("GPL");