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7cc560de YSB |
1 | /* |
2 | * clk-s2mps11.c - Clock driver for S2MPS11. | |
3 | * | |
4 | * Copyright (C) 2013 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 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/of.h> | |
25 | #include <linux/clkdev.h> | |
26 | #include <linux/regmap.h> | |
27 | #include <linux/clk-provider.h> | |
28 | #include <linux/platform_device.h> | |
29 | #include <linux/mfd/samsung/s2mps11.h> | |
e8e6b840 | 30 | #include <linux/mfd/samsung/s5m8767.h> |
7cc560de YSB |
31 | #include <linux/mfd/samsung/core.h> |
32 | ||
33 | #define s2mps11_name(a) (a->hw.init->name) | |
34 | ||
35 | static struct clk **clk_table; | |
36 | static struct clk_onecell_data clk_data; | |
37 | ||
38 | enum { | |
39 | S2MPS11_CLK_AP = 0, | |
40 | S2MPS11_CLK_CP, | |
41 | S2MPS11_CLK_BT, | |
42 | S2MPS11_CLKS_NUM, | |
43 | }; | |
44 | ||
45 | struct s2mps11_clk { | |
46 | struct sec_pmic_dev *iodev; | |
47 | struct clk_hw hw; | |
48 | struct clk *clk; | |
49 | struct clk_lookup *lookup; | |
50 | u32 mask; | |
51 | bool enabled; | |
64d64c35 | 52 | unsigned int reg; |
7cc560de YSB |
53 | }; |
54 | ||
55 | static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw) | |
56 | { | |
57 | return container_of(hw, struct s2mps11_clk, hw); | |
58 | } | |
59 | ||
60 | static int s2mps11_clk_prepare(struct clk_hw *hw) | |
61 | { | |
62 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
63 | int ret; | |
64 | ||
1b1ccee1 | 65 | ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, |
64d64c35 | 66 | s2mps11->reg, |
7cc560de YSB |
67 | s2mps11->mask, s2mps11->mask); |
68 | if (!ret) | |
69 | s2mps11->enabled = true; | |
70 | ||
71 | return ret; | |
72 | } | |
73 | ||
74 | static void s2mps11_clk_unprepare(struct clk_hw *hw) | |
75 | { | |
76 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
77 | int ret; | |
78 | ||
64d64c35 | 79 | ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg, |
7cc560de YSB |
80 | s2mps11->mask, ~s2mps11->mask); |
81 | ||
82 | if (!ret) | |
83 | s2mps11->enabled = false; | |
84 | } | |
85 | ||
86 | static int s2mps11_clk_is_enabled(struct clk_hw *hw) | |
87 | { | |
88 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
89 | ||
90 | return s2mps11->enabled; | |
91 | } | |
92 | ||
93 | static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, | |
94 | unsigned long parent_rate) | |
95 | { | |
96 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
97 | if (s2mps11->enabled) | |
98 | return 32768; | |
99 | else | |
100 | return 0; | |
101 | } | |
102 | ||
103 | static struct clk_ops s2mps11_clk_ops = { | |
104 | .prepare = s2mps11_clk_prepare, | |
105 | .unprepare = s2mps11_clk_unprepare, | |
106 | .is_enabled = s2mps11_clk_is_enabled, | |
107 | .recalc_rate = s2mps11_clk_recalc_rate, | |
108 | }; | |
109 | ||
110 | static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = { | |
111 | [S2MPS11_CLK_AP] = { | |
112 | .name = "s2mps11_ap", | |
113 | .ops = &s2mps11_clk_ops, | |
114 | .flags = CLK_IS_ROOT, | |
115 | }, | |
116 | [S2MPS11_CLK_CP] = { | |
117 | .name = "s2mps11_cp", | |
118 | .ops = &s2mps11_clk_ops, | |
119 | .flags = CLK_IS_ROOT, | |
120 | }, | |
121 | [S2MPS11_CLK_BT] = { | |
122 | .name = "s2mps11_bt", | |
123 | .ops = &s2mps11_clk_ops, | |
124 | .flags = CLK_IS_ROOT, | |
125 | }, | |
126 | }; | |
127 | ||
128 | static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev) | |
129 | { | |
130 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
131 | struct device_node *clk_np; | |
132 | int i; | |
133 | ||
134 | if (!iodev->dev->of_node) | |
238e1405 | 135 | return ERR_PTR(-EINVAL); |
7cc560de | 136 | |
afbd1a0c | 137 | clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks"); |
7cc560de YSB |
138 | if (!clk_np) { |
139 | dev_err(&pdev->dev, "could not find clock sub-node\n"); | |
140 | return ERR_PTR(-EINVAL); | |
141 | } | |
142 | ||
143 | clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * | |
144 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
145 | if (!clk_table) | |
146 | return ERR_PTR(-ENOMEM); | |
147 | ||
148 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) | |
149 | of_property_read_string_index(clk_np, "clock-output-names", i, | |
150 | &s2mps11_clks_init[i].name); | |
151 | ||
152 | return clk_np; | |
153 | } | |
154 | ||
155 | static int s2mps11_clk_probe(struct platform_device *pdev) | |
156 | { | |
157 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
158 | struct s2mps11_clk *s2mps11_clks, *s2mps11_clk; | |
159 | struct device_node *clk_np = NULL; | |
64d64c35 | 160 | unsigned int s2mps11_reg; |
7cc560de YSB |
161 | int i, ret = 0; |
162 | u32 val; | |
163 | ||
164 | s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * | |
165 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
166 | if (!s2mps11_clks) | |
167 | return -ENOMEM; | |
168 | ||
169 | s2mps11_clk = s2mps11_clks; | |
170 | ||
171 | clk_np = s2mps11_clk_parse_dt(pdev); | |
172 | if (IS_ERR(clk_np)) | |
173 | return PTR_ERR(clk_np); | |
174 | ||
64d64c35 TB |
175 | switch(platform_get_device_id(pdev)->driver_data) { |
176 | case S2MPS11X: | |
177 | s2mps11_reg = S2MPS11_REG_RTC_CTRL; | |
178 | break; | |
e8e6b840 TB |
179 | case S5M8767X: |
180 | s2mps11_reg = S5M8767_REG_CTRL1; | |
181 | break; | |
64d64c35 TB |
182 | default: |
183 | dev_err(&pdev->dev, "Invalid device type\n"); | |
184 | return -EINVAL; | |
185 | }; | |
186 | ||
7cc560de YSB |
187 | for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) { |
188 | s2mps11_clk->iodev = iodev; | |
189 | s2mps11_clk->hw.init = &s2mps11_clks_init[i]; | |
190 | s2mps11_clk->mask = 1 << i; | |
64d64c35 | 191 | s2mps11_clk->reg = s2mps11_reg; |
7cc560de | 192 | |
1b1ccee1 | 193 | ret = regmap_read(s2mps11_clk->iodev->regmap_pmic, |
64d64c35 | 194 | s2mps11_clk->reg, &val); |
7cc560de YSB |
195 | if (ret < 0) |
196 | goto err_reg; | |
197 | ||
198 | s2mps11_clk->enabled = val & s2mps11_clk->mask; | |
199 | ||
200 | s2mps11_clk->clk = devm_clk_register(&pdev->dev, | |
201 | &s2mps11_clk->hw); | |
202 | if (IS_ERR(s2mps11_clk->clk)) { | |
203 | dev_err(&pdev->dev, "Fail to register : %s\n", | |
204 | s2mps11_name(s2mps11_clk)); | |
205 | ret = PTR_ERR(s2mps11_clk->clk); | |
206 | goto err_reg; | |
207 | } | |
208 | ||
209 | s2mps11_clk->lookup = devm_kzalloc(&pdev->dev, | |
210 | sizeof(struct clk_lookup), GFP_KERNEL); | |
211 | if (!s2mps11_clk->lookup) { | |
212 | ret = -ENOMEM; | |
213 | goto err_lup; | |
214 | } | |
215 | ||
216 | s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk); | |
217 | s2mps11_clk->lookup->clk = s2mps11_clk->clk; | |
218 | ||
219 | clkdev_add(s2mps11_clk->lookup); | |
220 | } | |
221 | ||
222 | if (clk_table) { | |
223 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) | |
224 | clk_table[i] = s2mps11_clks[i].clk; | |
225 | ||
226 | clk_data.clks = clk_table; | |
227 | clk_data.clk_num = S2MPS11_CLKS_NUM; | |
228 | of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data); | |
229 | } | |
230 | ||
231 | platform_set_drvdata(pdev, s2mps11_clks); | |
232 | ||
233 | return ret; | |
234 | err_lup: | |
235 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
236 | err_reg: | |
237 | while (s2mps11_clk > s2mps11_clks) { | |
238 | if (s2mps11_clk->lookup) { | |
239 | clkdev_drop(s2mps11_clk->lookup); | |
240 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
241 | } | |
242 | s2mps11_clk--; | |
243 | } | |
244 | ||
245 | return ret; | |
246 | } | |
247 | ||
248 | static int s2mps11_clk_remove(struct platform_device *pdev) | |
249 | { | |
250 | struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev); | |
251 | int i; | |
252 | ||
253 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) | |
254 | clkdev_drop(s2mps11_clks[i].lookup); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | static const struct platform_device_id s2mps11_clk_id[] = { | |
64d64c35 | 260 | { "s2mps11-clk", S2MPS11X}, |
e8e6b840 | 261 | { "s5m8767-clk", S5M8767X}, |
7cc560de YSB |
262 | { }, |
263 | }; | |
264 | MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); | |
265 | ||
266 | static struct platform_driver s2mps11_clk_driver = { | |
267 | .driver = { | |
268 | .name = "s2mps11-clk", | |
269 | .owner = THIS_MODULE, | |
270 | }, | |
271 | .probe = s2mps11_clk_probe, | |
272 | .remove = s2mps11_clk_remove, | |
273 | .id_table = s2mps11_clk_id, | |
274 | }; | |
275 | ||
276 | static int __init s2mps11_clk_init(void) | |
277 | { | |
278 | return platform_driver_register(&s2mps11_clk_driver); | |
279 | } | |
280 | subsys_initcall(s2mps11_clk_init); | |
281 | ||
282 | static void __init s2mps11_clk_cleanup(void) | |
283 | { | |
284 | platform_driver_unregister(&s2mps11_clk_driver); | |
285 | } | |
286 | module_exit(s2mps11_clk_cleanup); | |
287 | ||
288 | MODULE_DESCRIPTION("S2MPS11 Clock Driver"); | |
289 | MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>"); | |
290 | MODULE_LICENSE("GPL"); |