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7cc560de YSB |
1 | /* |
2 | * clk-s2mps11.c - Clock driver for S2MPS11. | |
3 | * | |
e8b60a45 | 4 | * Copyright (C) 2013,2014 Samsung Electornics |
7cc560de YSB |
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 | * | |
7cc560de YSB |
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> | |
f928b53d | 26 | #include <linux/mfd/samsung/s2mps13.h> |
e8b60a45 | 27 | #include <linux/mfd/samsung/s2mps14.h> |
e8e6b840 | 28 | #include <linux/mfd/samsung/s5m8767.h> |
7cc560de YSB |
29 | #include <linux/mfd/samsung/core.h> |
30 | ||
31 | #define s2mps11_name(a) (a->hw.init->name) | |
32 | ||
33 | static struct clk **clk_table; | |
34 | static struct clk_onecell_data clk_data; | |
35 | ||
36 | enum { | |
37 | S2MPS11_CLK_AP = 0, | |
38 | S2MPS11_CLK_CP, | |
39 | S2MPS11_CLK_BT, | |
40 | S2MPS11_CLKS_NUM, | |
41 | }; | |
42 | ||
43 | struct s2mps11_clk { | |
44 | struct sec_pmic_dev *iodev; | |
bf416bd4 | 45 | struct device_node *clk_np; |
7cc560de YSB |
46 | struct clk_hw hw; |
47 | struct clk *clk; | |
48 | struct clk_lookup *lookup; | |
49 | u32 mask; | |
64d64c35 | 50 | unsigned int reg; |
7cc560de YSB |
51 | }; |
52 | ||
53 | static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw) | |
54 | { | |
55 | return container_of(hw, struct s2mps11_clk, hw); | |
56 | } | |
57 | ||
58 | static int s2mps11_clk_prepare(struct clk_hw *hw) | |
59 | { | |
60 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
61 | int ret; | |
62 | ||
1b1ccee1 | 63 | ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, |
64d64c35 | 64 | s2mps11->reg, |
7cc560de | 65 | s2mps11->mask, s2mps11->mask); |
7cc560de YSB |
66 | |
67 | return ret; | |
68 | } | |
69 | ||
70 | static void s2mps11_clk_unprepare(struct clk_hw *hw) | |
71 | { | |
72 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
73 | int ret; | |
74 | ||
64d64c35 | 75 | ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg, |
7cc560de | 76 | s2mps11->mask, ~s2mps11->mask); |
7cc560de YSB |
77 | } |
78 | ||
89ed7e6e | 79 | static int s2mps11_clk_is_prepared(struct clk_hw *hw) |
7cc560de | 80 | { |
89ed7e6e KW |
81 | int ret; |
82 | u32 val; | |
7cc560de YSB |
83 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); |
84 | ||
89ed7e6e KW |
85 | ret = regmap_read(s2mps11->iodev->regmap_pmic, |
86 | s2mps11->reg, &val); | |
87 | if (ret < 0) | |
88 | return -EINVAL; | |
89 | ||
90 | return val & s2mps11->mask; | |
7cc560de YSB |
91 | } |
92 | ||
93 | static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, | |
94 | unsigned long parent_rate) | |
95 | { | |
89ed7e6e | 96 | return 32768; |
7cc560de YSB |
97 | } |
98 | ||
99 | static struct clk_ops s2mps11_clk_ops = { | |
100 | .prepare = s2mps11_clk_prepare, | |
101 | .unprepare = s2mps11_clk_unprepare, | |
89ed7e6e | 102 | .is_prepared = s2mps11_clk_is_prepared, |
7cc560de YSB |
103 | .recalc_rate = s2mps11_clk_recalc_rate, |
104 | }; | |
105 | ||
106 | static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = { | |
107 | [S2MPS11_CLK_AP] = { | |
108 | .name = "s2mps11_ap", | |
109 | .ops = &s2mps11_clk_ops, | |
110 | .flags = CLK_IS_ROOT, | |
111 | }, | |
112 | [S2MPS11_CLK_CP] = { | |
113 | .name = "s2mps11_cp", | |
114 | .ops = &s2mps11_clk_ops, | |
115 | .flags = CLK_IS_ROOT, | |
116 | }, | |
117 | [S2MPS11_CLK_BT] = { | |
118 | .name = "s2mps11_bt", | |
119 | .ops = &s2mps11_clk_ops, | |
120 | .flags = CLK_IS_ROOT, | |
121 | }, | |
122 | }; | |
123 | ||
f928b53d CC |
124 | static struct clk_init_data s2mps13_clks_init[S2MPS11_CLKS_NUM] = { |
125 | [S2MPS11_CLK_AP] = { | |
126 | .name = "s2mps13_ap", | |
127 | .ops = &s2mps11_clk_ops, | |
128 | .flags = CLK_IS_ROOT, | |
129 | }, | |
130 | [S2MPS11_CLK_CP] = { | |
131 | .name = "s2mps13_cp", | |
132 | .ops = &s2mps11_clk_ops, | |
133 | .flags = CLK_IS_ROOT, | |
134 | }, | |
135 | [S2MPS11_CLK_BT] = { | |
136 | .name = "s2mps13_bt", | |
137 | .ops = &s2mps11_clk_ops, | |
138 | .flags = CLK_IS_ROOT, | |
139 | }, | |
140 | }; | |
141 | ||
e8b60a45 KK |
142 | static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = { |
143 | [S2MPS11_CLK_AP] = { | |
144 | .name = "s2mps14_ap", | |
145 | .ops = &s2mps11_clk_ops, | |
146 | .flags = CLK_IS_ROOT, | |
147 | }, | |
148 | [S2MPS11_CLK_BT] = { | |
149 | .name = "s2mps14_bt", | |
150 | .ops = &s2mps11_clk_ops, | |
151 | .flags = CLK_IS_ROOT, | |
152 | }, | |
153 | }; | |
154 | ||
155 | static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev, | |
156 | struct clk_init_data *clks_init) | |
7cc560de YSB |
157 | { |
158 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
159 | struct device_node *clk_np; | |
160 | int i; | |
161 | ||
162 | if (!iodev->dev->of_node) | |
238e1405 | 163 | return ERR_PTR(-EINVAL); |
7cc560de | 164 | |
afbd1a0c | 165 | clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks"); |
7cc560de YSB |
166 | if (!clk_np) { |
167 | dev_err(&pdev->dev, "could not find clock sub-node\n"); | |
168 | return ERR_PTR(-EINVAL); | |
169 | } | |
170 | ||
e8b60a45 KK |
171 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
172 | if (!clks_init[i].name) | |
173 | continue; /* Skip clocks not present in some devices */ | |
7cc560de | 174 | of_property_read_string_index(clk_np, "clock-output-names", i, |
e8b60a45 KK |
175 | &clks_init[i].name); |
176 | } | |
7cc560de YSB |
177 | |
178 | return clk_np; | |
179 | } | |
180 | ||
181 | static int s2mps11_clk_probe(struct platform_device *pdev) | |
182 | { | |
183 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
184 | struct s2mps11_clk *s2mps11_clks, *s2mps11_clk; | |
64d64c35 | 185 | unsigned int s2mps11_reg; |
e8b60a45 | 186 | struct clk_init_data *clks_init; |
7cc560de | 187 | int i, ret = 0; |
7cc560de YSB |
188 | |
189 | s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * | |
190 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
191 | if (!s2mps11_clks) | |
192 | return -ENOMEM; | |
193 | ||
194 | s2mps11_clk = s2mps11_clks; | |
195 | ||
7002483c KK |
196 | clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * |
197 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
198 | if (!clk_table) | |
199 | return -ENOMEM; | |
200 | ||
64d64c35 TB |
201 | switch(platform_get_device_id(pdev)->driver_data) { |
202 | case S2MPS11X: | |
203 | s2mps11_reg = S2MPS11_REG_RTC_CTRL; | |
e8b60a45 KK |
204 | clks_init = s2mps11_clks_init; |
205 | break; | |
f928b53d CC |
206 | case S2MPS13X: |
207 | s2mps11_reg = S2MPS13_REG_RTCCTRL; | |
208 | clks_init = s2mps13_clks_init; | |
209 | break; | |
e8b60a45 KK |
210 | case S2MPS14X: |
211 | s2mps11_reg = S2MPS14_REG_RTCCTRL; | |
212 | clks_init = s2mps14_clks_init; | |
64d64c35 | 213 | break; |
e8e6b840 TB |
214 | case S5M8767X: |
215 | s2mps11_reg = S5M8767_REG_CTRL1; | |
e8b60a45 | 216 | clks_init = s2mps11_clks_init; |
e8e6b840 | 217 | break; |
64d64c35 TB |
218 | default: |
219 | dev_err(&pdev->dev, "Invalid device type\n"); | |
220 | return -EINVAL; | |
250d07d1 | 221 | } |
64d64c35 | 222 | |
e8b60a45 KK |
223 | /* Store clocks of_node in first element of s2mps11_clks array */ |
224 | s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init); | |
225 | if (IS_ERR(s2mps11_clks->clk_np)) | |
226 | return PTR_ERR(s2mps11_clks->clk_np); | |
227 | ||
7cc560de | 228 | for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) { |
e8b60a45 KK |
229 | if (!clks_init[i].name) |
230 | continue; /* Skip clocks not present in some devices */ | |
7cc560de | 231 | s2mps11_clk->iodev = iodev; |
e8b60a45 | 232 | s2mps11_clk->hw.init = &clks_init[i]; |
7cc560de | 233 | s2mps11_clk->mask = 1 << i; |
64d64c35 | 234 | s2mps11_clk->reg = s2mps11_reg; |
7cc560de | 235 | |
7cc560de YSB |
236 | s2mps11_clk->clk = devm_clk_register(&pdev->dev, |
237 | &s2mps11_clk->hw); | |
238 | if (IS_ERR(s2mps11_clk->clk)) { | |
239 | dev_err(&pdev->dev, "Fail to register : %s\n", | |
240 | s2mps11_name(s2mps11_clk)); | |
241 | ret = PTR_ERR(s2mps11_clk->clk); | |
242 | goto err_reg; | |
243 | } | |
244 | ||
079ed368 | 245 | s2mps11_clk->lookup = clkdev_create(s2mps11_clk->clk, |
2a96dfa4 | 246 | s2mps11_name(s2mps11_clk), NULL); |
7cc560de YSB |
247 | if (!s2mps11_clk->lookup) { |
248 | ret = -ENOMEM; | |
249 | goto err_lup; | |
250 | } | |
7cc560de YSB |
251 | } |
252 | ||
e8b60a45 KK |
253 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
254 | /* Skip clocks not present on S2MPS14 */ | |
255 | if (!clks_init[i].name) | |
256 | continue; | |
7002483c | 257 | clk_table[i] = s2mps11_clks[i].clk; |
e8b60a45 | 258 | } |
7cc560de | 259 | |
7002483c KK |
260 | clk_data.clks = clk_table; |
261 | clk_data.clk_num = S2MPS11_CLKS_NUM; | |
262 | of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get, | |
263 | &clk_data); | |
7cc560de YSB |
264 | |
265 | platform_set_drvdata(pdev, s2mps11_clks); | |
266 | ||
267 | return ret; | |
268 | err_lup: | |
269 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
270 | err_reg: | |
271 | while (s2mps11_clk > s2mps11_clks) { | |
272 | if (s2mps11_clk->lookup) { | |
273 | clkdev_drop(s2mps11_clk->lookup); | |
274 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
275 | } | |
276 | s2mps11_clk--; | |
277 | } | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | static int s2mps11_clk_remove(struct platform_device *pdev) | |
283 | { | |
284 | struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev); | |
285 | int i; | |
286 | ||
bf416bd4 KK |
287 | of_clk_del_provider(s2mps11_clks[0].clk_np); |
288 | /* Drop the reference obtained in s2mps11_clk_parse_dt */ | |
289 | of_node_put(s2mps11_clks[0].clk_np); | |
290 | ||
e8b60a45 KK |
291 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
292 | /* Skip clocks not present on S2MPS14 */ | |
293 | if (!s2mps11_clks[i].lookup) | |
294 | continue; | |
7cc560de | 295 | clkdev_drop(s2mps11_clks[i].lookup); |
e8b60a45 | 296 | } |
7cc560de YSB |
297 | |
298 | return 0; | |
299 | } | |
300 | ||
301 | static const struct platform_device_id s2mps11_clk_id[] = { | |
64d64c35 | 302 | { "s2mps11-clk", S2MPS11X}, |
f928b53d | 303 | { "s2mps13-clk", S2MPS13X}, |
e8b60a45 | 304 | { "s2mps14-clk", S2MPS14X}, |
e8e6b840 | 305 | { "s5m8767-clk", S5M8767X}, |
7cc560de YSB |
306 | { }, |
307 | }; | |
308 | MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); | |
309 | ||
310 | static struct platform_driver s2mps11_clk_driver = { | |
311 | .driver = { | |
312 | .name = "s2mps11-clk", | |
7cc560de YSB |
313 | }, |
314 | .probe = s2mps11_clk_probe, | |
315 | .remove = s2mps11_clk_remove, | |
316 | .id_table = s2mps11_clk_id, | |
317 | }; | |
318 | ||
319 | static int __init s2mps11_clk_init(void) | |
320 | { | |
321 | return platform_driver_register(&s2mps11_clk_driver); | |
322 | } | |
323 | subsys_initcall(s2mps11_clk_init); | |
324 | ||
325 | static void __init s2mps11_clk_cleanup(void) | |
326 | { | |
327 | platform_driver_unregister(&s2mps11_clk_driver); | |
328 | } | |
329 | module_exit(s2mps11_clk_cleanup); | |
330 | ||
331 | MODULE_DESCRIPTION("S2MPS11 Clock Driver"); | |
332 | MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>"); | |
333 | MODULE_LICENSE("GPL"); |