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