Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / drivers / clk / clk-s2mps11.c
1 /*
2  * clk-s2mps11.c - Clock driver for S2MPS11.
3  *
4  * Copyright (C) 2013,2014 Samsung Electornics
5  *
6  * This program is free software; you can redistribute  it and/or modify it
7  * under  the terms of  the GNU General  Public License as published by the
8  * Free Software Foundation;  either version 2 of the  License, or (at your
9  * option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  */
17
18 #include <linux/module.h>
19 #include <linux/err.h>
20 #include <linux/of.h>
21 #include <linux/clkdev.h>
22 #include <linux/regmap.h>
23 #include <linux/clk-provider.h>
24 #include <linux/platform_device.h>
25 #include <linux/mfd/samsung/s2mps11.h>
26 #include <linux/mfd/samsung/s2mps13.h>
27 #include <linux/mfd/samsung/s2mps14.h>
28 #include <linux/mfd/samsung/s5m8767.h>
29 #include <linux/mfd/samsung/core.h>
30
31 enum {
32         S2MPS11_CLK_AP = 0,
33         S2MPS11_CLK_CP,
34         S2MPS11_CLK_BT,
35         S2MPS11_CLKS_NUM,
36 };
37
38 struct s2mps11_clk {
39         struct sec_pmic_dev *iodev;
40         struct device_node *clk_np;
41         struct clk_hw hw;
42         struct clk *clk;
43         struct clk_lookup *lookup;
44         u32 mask;
45         unsigned int reg;
46 };
47
48 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
49 {
50         return container_of(hw, struct s2mps11_clk, hw);
51 }
52
53 static int s2mps11_clk_prepare(struct clk_hw *hw)
54 {
55         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
56
57         return regmap_update_bits(s2mps11->iodev->regmap_pmic,
58                                  s2mps11->reg,
59                                  s2mps11->mask, s2mps11->mask);
60 }
61
62 static void s2mps11_clk_unprepare(struct clk_hw *hw)
63 {
64         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
65
66         regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
67                            s2mps11->mask, ~s2mps11->mask);
68 }
69
70 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
71 {
72         int ret;
73         u32 val;
74         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
75
76         ret = regmap_read(s2mps11->iodev->regmap_pmic,
77                                 s2mps11->reg, &val);
78         if (ret < 0)
79                 return -EINVAL;
80
81         return val & s2mps11->mask;
82 }
83
84 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
85                                              unsigned long parent_rate)
86 {
87         return 32768;
88 }
89
90 static struct clk_ops s2mps11_clk_ops = {
91         .prepare        = s2mps11_clk_prepare,
92         .unprepare      = s2mps11_clk_unprepare,
93         .is_prepared    = s2mps11_clk_is_prepared,
94         .recalc_rate    = s2mps11_clk_recalc_rate,
95 };
96
97 /* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
98 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
99         [S2MPS11_CLK_AP] = {
100                 .name = "s2mps11_ap",
101                 .ops = &s2mps11_clk_ops,
102         },
103         [S2MPS11_CLK_CP] = {
104                 .name = "s2mps11_cp",
105                 .ops = &s2mps11_clk_ops,
106         },
107         [S2MPS11_CLK_BT] = {
108                 .name = "s2mps11_bt",
109                 .ops = &s2mps11_clk_ops,
110         },
111 };
112
113 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
114                 struct clk_init_data *clks_init)
115 {
116         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
117         struct device_node *clk_np;
118         int i;
119
120         if (!iodev->dev->of_node)
121                 return ERR_PTR(-EINVAL);
122
123         clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
124         if (!clk_np) {
125                 dev_err(&pdev->dev, "could not find clock sub-node\n");
126                 return ERR_PTR(-EINVAL);
127         }
128
129         for (i = 0; i < S2MPS11_CLKS_NUM; i++)
130                 of_property_read_string_index(clk_np, "clock-output-names", i,
131                                 &clks_init[i].name);
132
133         return clk_np;
134 }
135
136 static int s2mps11_clk_probe(struct platform_device *pdev)
137 {
138         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
139         struct s2mps11_clk *s2mps11_clks;
140         struct clk_hw_onecell_data *clk_data;
141         unsigned int s2mps11_reg;
142         int i, ret = 0;
143         enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data;
144
145         s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
146                                 sizeof(*s2mps11_clks), GFP_KERNEL);
147         if (!s2mps11_clks)
148                 return -ENOMEM;
149
150         clk_data = devm_kzalloc(&pdev->dev, sizeof(*clk_data) +
151                                 sizeof(*clk_data->hws) * S2MPS11_CLKS_NUM,
152                                 GFP_KERNEL);
153         if (!clk_data)
154                 return -ENOMEM;
155
156         switch (hwid) {
157         case S2MPS11X:
158                 s2mps11_reg = S2MPS11_REG_RTC_CTRL;
159                 break;
160         case S2MPS13X:
161                 s2mps11_reg = S2MPS13_REG_RTCCTRL;
162                 break;
163         case S2MPS14X:
164                 s2mps11_reg = S2MPS14_REG_RTCCTRL;
165                 break;
166         case S5M8767X:
167                 s2mps11_reg = S5M8767_REG_CTRL1;
168                 break;
169         default:
170                 dev_err(&pdev->dev, "Invalid device type\n");
171                 return -EINVAL;
172         }
173
174         /* Store clocks of_node in first element of s2mps11_clks array */
175         s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init);
176         if (IS_ERR(s2mps11_clks->clk_np))
177                 return PTR_ERR(s2mps11_clks->clk_np);
178
179         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
180                 if (i == S2MPS11_CLK_CP && hwid == S2MPS14X)
181                         continue; /* Skip clocks not present in some devices */
182                 s2mps11_clks[i].iodev = iodev;
183                 s2mps11_clks[i].hw.init = &s2mps11_clks_init[i];
184                 s2mps11_clks[i].mask = 1 << i;
185                 s2mps11_clks[i].reg = s2mps11_reg;
186
187                 s2mps11_clks[i].clk = devm_clk_register(&pdev->dev,
188                                                         &s2mps11_clks[i].hw);
189                 if (IS_ERR(s2mps11_clks[i].clk)) {
190                         dev_err(&pdev->dev, "Fail to register : %s\n",
191                                                 s2mps11_clks_init[i].name);
192                         ret = PTR_ERR(s2mps11_clks[i].clk);
193                         goto err_reg;
194                 }
195
196                 s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw,
197                                         s2mps11_clks_init[i].name, NULL);
198                 if (!s2mps11_clks[i].lookup) {
199                         ret = -ENOMEM;
200                         goto err_reg;
201                 }
202                 clk_data->hws[i] = &s2mps11_clks[i].hw;
203         }
204
205         clk_data->num = S2MPS11_CLKS_NUM;
206         of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get,
207                                clk_data);
208
209         platform_set_drvdata(pdev, s2mps11_clks);
210
211         return ret;
212
213 err_reg:
214         while (--i >= 0)
215                 clkdev_drop(s2mps11_clks[i].lookup);
216
217         return ret;
218 }
219
220 static int s2mps11_clk_remove(struct platform_device *pdev)
221 {
222         struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
223         int i;
224
225         of_clk_del_provider(s2mps11_clks[0].clk_np);
226         /* Drop the reference obtained in s2mps11_clk_parse_dt */
227         of_node_put(s2mps11_clks[0].clk_np);
228
229         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
230                 /* Skip clocks not present on S2MPS14 */
231                 if (!s2mps11_clks[i].lookup)
232                         continue;
233                 clkdev_drop(s2mps11_clks[i].lookup);
234         }
235
236         return 0;
237 }
238
239 static const struct platform_device_id s2mps11_clk_id[] = {
240         { "s2mps11-clk", S2MPS11X},
241         { "s2mps13-clk", S2MPS13X},
242         { "s2mps14-clk", S2MPS14X},
243         { "s5m8767-clk", S5M8767X},
244         { },
245 };
246 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
247
248 static struct platform_driver s2mps11_clk_driver = {
249         .driver = {
250                 .name  = "s2mps11-clk",
251         },
252         .probe = s2mps11_clk_probe,
253         .remove = s2mps11_clk_remove,
254         .id_table = s2mps11_clk_id,
255 };
256
257 static int __init s2mps11_clk_init(void)
258 {
259         return platform_driver_register(&s2mps11_clk_driver);
260 }
261 subsys_initcall(s2mps11_clk_init);
262
263 static void __exit s2mps11_clk_cleanup(void)
264 {
265         platform_driver_unregister(&s2mps11_clk_driver);
266 }
267 module_exit(s2mps11_clk_cleanup);
268
269 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
270 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
271 MODULE_LICENSE("GPL");