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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> | |
e8b60a45 | 26 | #include <linux/mfd/samsung/s2mps14.h> |
e8e6b840 | 27 | #include <linux/mfd/samsung/s5m8767.h> |
7cc560de YSB |
28 | #include <linux/mfd/samsung/core.h> |
29 | ||
30 | #define s2mps11_name(a) (a->hw.init->name) | |
31 | ||
32 | static struct clk **clk_table; | |
33 | static struct clk_onecell_data clk_data; | |
34 | ||
35 | enum { | |
36 | S2MPS11_CLK_AP = 0, | |
37 | S2MPS11_CLK_CP, | |
38 | S2MPS11_CLK_BT, | |
39 | S2MPS11_CLKS_NUM, | |
40 | }; | |
41 | ||
42 | struct s2mps11_clk { | |
43 | struct sec_pmic_dev *iodev; | |
bf416bd4 | 44 | struct device_node *clk_np; |
7cc560de YSB |
45 | struct clk_hw hw; |
46 | struct clk *clk; | |
47 | struct clk_lookup *lookup; | |
48 | u32 mask; | |
49 | bool enabled; | |
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 YSB |
65 | s2mps11->mask, s2mps11->mask); |
66 | if (!ret) | |
67 | s2mps11->enabled = true; | |
68 | ||
69 | return ret; | |
70 | } | |
71 | ||
72 | static void s2mps11_clk_unprepare(struct clk_hw *hw) | |
73 | { | |
74 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
75 | int ret; | |
76 | ||
64d64c35 | 77 | ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg, |
7cc560de YSB |
78 | s2mps11->mask, ~s2mps11->mask); |
79 | ||
80 | if (!ret) | |
81 | s2mps11->enabled = false; | |
82 | } | |
83 | ||
84 | static int s2mps11_clk_is_enabled(struct clk_hw *hw) | |
85 | { | |
86 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
87 | ||
88 | return s2mps11->enabled; | |
89 | } | |
90 | ||
91 | static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, | |
92 | unsigned long parent_rate) | |
93 | { | |
94 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
95 | if (s2mps11->enabled) | |
96 | return 32768; | |
97 | else | |
98 | return 0; | |
99 | } | |
100 | ||
101 | static struct clk_ops s2mps11_clk_ops = { | |
102 | .prepare = s2mps11_clk_prepare, | |
103 | .unprepare = s2mps11_clk_unprepare, | |
104 | .is_enabled = s2mps11_clk_is_enabled, | |
105 | .recalc_rate = s2mps11_clk_recalc_rate, | |
106 | }; | |
107 | ||
108 | static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = { | |
109 | [S2MPS11_CLK_AP] = { | |
110 | .name = "s2mps11_ap", | |
111 | .ops = &s2mps11_clk_ops, | |
112 | .flags = CLK_IS_ROOT, | |
113 | }, | |
114 | [S2MPS11_CLK_CP] = { | |
115 | .name = "s2mps11_cp", | |
116 | .ops = &s2mps11_clk_ops, | |
117 | .flags = CLK_IS_ROOT, | |
118 | }, | |
119 | [S2MPS11_CLK_BT] = { | |
120 | .name = "s2mps11_bt", | |
121 | .ops = &s2mps11_clk_ops, | |
122 | .flags = CLK_IS_ROOT, | |
123 | }, | |
124 | }; | |
125 | ||
e8b60a45 KK |
126 | static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = { |
127 | [S2MPS11_CLK_AP] = { | |
128 | .name = "s2mps14_ap", | |
129 | .ops = &s2mps11_clk_ops, | |
130 | .flags = CLK_IS_ROOT, | |
131 | }, | |
132 | [S2MPS11_CLK_BT] = { | |
133 | .name = "s2mps14_bt", | |
134 | .ops = &s2mps11_clk_ops, | |
135 | .flags = CLK_IS_ROOT, | |
136 | }, | |
137 | }; | |
138 | ||
139 | static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev, | |
140 | struct clk_init_data *clks_init) | |
7cc560de YSB |
141 | { |
142 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
143 | struct device_node *clk_np; | |
144 | int i; | |
145 | ||
146 | if (!iodev->dev->of_node) | |
238e1405 | 147 | return ERR_PTR(-EINVAL); |
7cc560de | 148 | |
afbd1a0c | 149 | clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks"); |
7cc560de YSB |
150 | if (!clk_np) { |
151 | dev_err(&pdev->dev, "could not find clock sub-node\n"); | |
152 | return ERR_PTR(-EINVAL); | |
153 | } | |
154 | ||
e8b60a45 KK |
155 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
156 | if (!clks_init[i].name) | |
157 | continue; /* Skip clocks not present in some devices */ | |
7cc560de | 158 | of_property_read_string_index(clk_np, "clock-output-names", i, |
e8b60a45 KK |
159 | &clks_init[i].name); |
160 | } | |
7cc560de YSB |
161 | |
162 | return clk_np; | |
163 | } | |
164 | ||
165 | static int s2mps11_clk_probe(struct platform_device *pdev) | |
166 | { | |
167 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
168 | struct s2mps11_clk *s2mps11_clks, *s2mps11_clk; | |
64d64c35 | 169 | unsigned int s2mps11_reg; |
e8b60a45 | 170 | struct clk_init_data *clks_init; |
7cc560de YSB |
171 | int i, ret = 0; |
172 | u32 val; | |
173 | ||
174 | s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * | |
175 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
176 | if (!s2mps11_clks) | |
177 | return -ENOMEM; | |
178 | ||
179 | s2mps11_clk = s2mps11_clks; | |
180 | ||
7002483c KK |
181 | clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * |
182 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
183 | if (!clk_table) | |
184 | return -ENOMEM; | |
185 | ||
64d64c35 TB |
186 | switch(platform_get_device_id(pdev)->driver_data) { |
187 | case S2MPS11X: | |
188 | s2mps11_reg = S2MPS11_REG_RTC_CTRL; | |
e8b60a45 KK |
189 | clks_init = s2mps11_clks_init; |
190 | break; | |
191 | case S2MPS14X: | |
192 | s2mps11_reg = S2MPS14_REG_RTCCTRL; | |
193 | clks_init = s2mps14_clks_init; | |
64d64c35 | 194 | break; |
e8e6b840 TB |
195 | case S5M8767X: |
196 | s2mps11_reg = S5M8767_REG_CTRL1; | |
e8b60a45 | 197 | clks_init = s2mps11_clks_init; |
e8e6b840 | 198 | break; |
64d64c35 TB |
199 | default: |
200 | dev_err(&pdev->dev, "Invalid device type\n"); | |
201 | return -EINVAL; | |
202 | }; | |
203 | ||
e8b60a45 KK |
204 | /* Store clocks of_node in first element of s2mps11_clks array */ |
205 | s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init); | |
206 | if (IS_ERR(s2mps11_clks->clk_np)) | |
207 | return PTR_ERR(s2mps11_clks->clk_np); | |
208 | ||
7cc560de | 209 | for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) { |
e8b60a45 KK |
210 | if (!clks_init[i].name) |
211 | continue; /* Skip clocks not present in some devices */ | |
7cc560de | 212 | s2mps11_clk->iodev = iodev; |
e8b60a45 | 213 | s2mps11_clk->hw.init = &clks_init[i]; |
7cc560de | 214 | s2mps11_clk->mask = 1 << i; |
64d64c35 | 215 | s2mps11_clk->reg = s2mps11_reg; |
7cc560de | 216 | |
1b1ccee1 | 217 | ret = regmap_read(s2mps11_clk->iodev->regmap_pmic, |
64d64c35 | 218 | s2mps11_clk->reg, &val); |
7cc560de YSB |
219 | if (ret < 0) |
220 | goto err_reg; | |
221 | ||
222 | s2mps11_clk->enabled = val & s2mps11_clk->mask; | |
223 | ||
224 | s2mps11_clk->clk = devm_clk_register(&pdev->dev, | |
225 | &s2mps11_clk->hw); | |
226 | if (IS_ERR(s2mps11_clk->clk)) { | |
227 | dev_err(&pdev->dev, "Fail to register : %s\n", | |
228 | s2mps11_name(s2mps11_clk)); | |
229 | ret = PTR_ERR(s2mps11_clk->clk); | |
230 | goto err_reg; | |
231 | } | |
232 | ||
233 | s2mps11_clk->lookup = devm_kzalloc(&pdev->dev, | |
234 | sizeof(struct clk_lookup), GFP_KERNEL); | |
235 | if (!s2mps11_clk->lookup) { | |
236 | ret = -ENOMEM; | |
237 | goto err_lup; | |
238 | } | |
239 | ||
240 | s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk); | |
241 | s2mps11_clk->lookup->clk = s2mps11_clk->clk; | |
242 | ||
243 | clkdev_add(s2mps11_clk->lookup); | |
244 | } | |
245 | ||
e8b60a45 KK |
246 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
247 | /* Skip clocks not present on S2MPS14 */ | |
248 | if (!clks_init[i].name) | |
249 | continue; | |
7002483c | 250 | clk_table[i] = s2mps11_clks[i].clk; |
e8b60a45 | 251 | } |
7cc560de | 252 | |
7002483c KK |
253 | clk_data.clks = clk_table; |
254 | clk_data.clk_num = S2MPS11_CLKS_NUM; | |
255 | of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get, | |
256 | &clk_data); | |
7cc560de YSB |
257 | |
258 | platform_set_drvdata(pdev, s2mps11_clks); | |
259 | ||
260 | return ret; | |
261 | err_lup: | |
262 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
263 | err_reg: | |
264 | while (s2mps11_clk > s2mps11_clks) { | |
265 | if (s2mps11_clk->lookup) { | |
266 | clkdev_drop(s2mps11_clk->lookup); | |
267 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
268 | } | |
269 | s2mps11_clk--; | |
270 | } | |
271 | ||
272 | return ret; | |
273 | } | |
274 | ||
275 | static int s2mps11_clk_remove(struct platform_device *pdev) | |
276 | { | |
277 | struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev); | |
278 | int i; | |
279 | ||
bf416bd4 KK |
280 | of_clk_del_provider(s2mps11_clks[0].clk_np); |
281 | /* Drop the reference obtained in s2mps11_clk_parse_dt */ | |
282 | of_node_put(s2mps11_clks[0].clk_np); | |
283 | ||
e8b60a45 KK |
284 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
285 | /* Skip clocks not present on S2MPS14 */ | |
286 | if (!s2mps11_clks[i].lookup) | |
287 | continue; | |
7cc560de | 288 | clkdev_drop(s2mps11_clks[i].lookup); |
e8b60a45 | 289 | } |
7cc560de YSB |
290 | |
291 | return 0; | |
292 | } | |
293 | ||
294 | static const struct platform_device_id s2mps11_clk_id[] = { | |
64d64c35 | 295 | { "s2mps11-clk", S2MPS11X}, |
e8b60a45 | 296 | { "s2mps14-clk", S2MPS14X}, |
e8e6b840 | 297 | { "s5m8767-clk", S5M8767X}, |
7cc560de YSB |
298 | { }, |
299 | }; | |
300 | MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); | |
301 | ||
302 | static struct platform_driver s2mps11_clk_driver = { | |
303 | .driver = { | |
304 | .name = "s2mps11-clk", | |
305 | .owner = THIS_MODULE, | |
306 | }, | |
307 | .probe = s2mps11_clk_probe, | |
308 | .remove = s2mps11_clk_remove, | |
309 | .id_table = s2mps11_clk_id, | |
310 | }; | |
311 | ||
312 | static int __init s2mps11_clk_init(void) | |
313 | { | |
314 | return platform_driver_register(&s2mps11_clk_driver); | |
315 | } | |
316 | subsys_initcall(s2mps11_clk_init); | |
317 | ||
318 | static void __init s2mps11_clk_cleanup(void) | |
319 | { | |
320 | platform_driver_unregister(&s2mps11_clk_driver); | |
321 | } | |
322 | module_exit(s2mps11_clk_cleanup); | |
323 | ||
324 | MODULE_DESCRIPTION("S2MPS11 Clock Driver"); | |
325 | MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>"); | |
326 | MODULE_LICENSE("GPL"); |