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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> | |
30 | #include <linux/mfd/samsung/core.h> | |
31 | ||
32 | #define s2mps11_name(a) (a->hw.init->name) | |
33 | ||
34 | static struct clk **clk_table; | |
35 | static struct clk_onecell_data clk_data; | |
36 | ||
37 | enum { | |
38 | S2MPS11_CLK_AP = 0, | |
39 | S2MPS11_CLK_CP, | |
40 | S2MPS11_CLK_BT, | |
41 | S2MPS11_CLKS_NUM, | |
42 | }; | |
43 | ||
44 | struct s2mps11_clk { | |
45 | struct sec_pmic_dev *iodev; | |
46 | struct clk_hw hw; | |
47 | struct clk *clk; | |
48 | struct clk_lookup *lookup; | |
49 | u32 mask; | |
50 | bool enabled; | |
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 | ||
63 | ret = regmap_update_bits(s2mps11->iodev->regmap, | |
64 | S2MPS11_REG_RTC_CTRL, | |
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 | ||
77 | ret = regmap_update_bits(s2mps11->iodev->regmap, S2MPS11_REG_RTC_CTRL, | |
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 | ||
126 | static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev) | |
127 | { | |
128 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
129 | struct device_node *clk_np; | |
130 | int i; | |
131 | ||
132 | if (!iodev->dev->of_node) | |
133 | return NULL; | |
134 | ||
135 | clk_np = of_find_node_by_name(iodev->dev->of_node, "clocks"); | |
136 | if (!clk_np) { | |
137 | dev_err(&pdev->dev, "could not find clock sub-node\n"); | |
138 | return ERR_PTR(-EINVAL); | |
139 | } | |
140 | ||
141 | clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * | |
142 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
143 | if (!clk_table) | |
144 | return ERR_PTR(-ENOMEM); | |
145 | ||
146 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) | |
147 | of_property_read_string_index(clk_np, "clock-output-names", i, | |
148 | &s2mps11_clks_init[i].name); | |
149 | ||
150 | return clk_np; | |
151 | } | |
152 | ||
153 | static int s2mps11_clk_probe(struct platform_device *pdev) | |
154 | { | |
155 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
156 | struct s2mps11_clk *s2mps11_clks, *s2mps11_clk; | |
157 | struct device_node *clk_np = NULL; | |
158 | int i, ret = 0; | |
159 | u32 val; | |
160 | ||
161 | s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * | |
162 | S2MPS11_CLKS_NUM, GFP_KERNEL); | |
163 | if (!s2mps11_clks) | |
164 | return -ENOMEM; | |
165 | ||
166 | s2mps11_clk = s2mps11_clks; | |
167 | ||
168 | clk_np = s2mps11_clk_parse_dt(pdev); | |
169 | if (IS_ERR(clk_np)) | |
170 | return PTR_ERR(clk_np); | |
171 | ||
172 | for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) { | |
173 | s2mps11_clk->iodev = iodev; | |
174 | s2mps11_clk->hw.init = &s2mps11_clks_init[i]; | |
175 | s2mps11_clk->mask = 1 << i; | |
176 | ||
177 | ret = regmap_read(s2mps11_clk->iodev->regmap, | |
178 | S2MPS11_REG_RTC_CTRL, &val); | |
179 | if (ret < 0) | |
180 | goto err_reg; | |
181 | ||
182 | s2mps11_clk->enabled = val & s2mps11_clk->mask; | |
183 | ||
184 | s2mps11_clk->clk = devm_clk_register(&pdev->dev, | |
185 | &s2mps11_clk->hw); | |
186 | if (IS_ERR(s2mps11_clk->clk)) { | |
187 | dev_err(&pdev->dev, "Fail to register : %s\n", | |
188 | s2mps11_name(s2mps11_clk)); | |
189 | ret = PTR_ERR(s2mps11_clk->clk); | |
190 | goto err_reg; | |
191 | } | |
192 | ||
193 | s2mps11_clk->lookup = devm_kzalloc(&pdev->dev, | |
194 | sizeof(struct clk_lookup), GFP_KERNEL); | |
195 | if (!s2mps11_clk->lookup) { | |
196 | ret = -ENOMEM; | |
197 | goto err_lup; | |
198 | } | |
199 | ||
200 | s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk); | |
201 | s2mps11_clk->lookup->clk = s2mps11_clk->clk; | |
202 | ||
203 | clkdev_add(s2mps11_clk->lookup); | |
204 | } | |
205 | ||
206 | if (clk_table) { | |
207 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) | |
208 | clk_table[i] = s2mps11_clks[i].clk; | |
209 | ||
210 | clk_data.clks = clk_table; | |
211 | clk_data.clk_num = S2MPS11_CLKS_NUM; | |
212 | of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data); | |
213 | } | |
214 | ||
215 | platform_set_drvdata(pdev, s2mps11_clks); | |
216 | ||
217 | return ret; | |
218 | err_lup: | |
219 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
220 | err_reg: | |
221 | while (s2mps11_clk > s2mps11_clks) { | |
222 | if (s2mps11_clk->lookup) { | |
223 | clkdev_drop(s2mps11_clk->lookup); | |
224 | devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); | |
225 | } | |
226 | s2mps11_clk--; | |
227 | } | |
228 | ||
229 | return ret; | |
230 | } | |
231 | ||
232 | static int s2mps11_clk_remove(struct platform_device *pdev) | |
233 | { | |
234 | struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev); | |
235 | int i; | |
236 | ||
237 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) | |
238 | clkdev_drop(s2mps11_clks[i].lookup); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | static const struct platform_device_id s2mps11_clk_id[] = { | |
244 | { "s2mps11-clk", 0}, | |
245 | { }, | |
246 | }; | |
247 | MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); | |
248 | ||
249 | static struct platform_driver s2mps11_clk_driver = { | |
250 | .driver = { | |
251 | .name = "s2mps11-clk", | |
252 | .owner = THIS_MODULE, | |
253 | }, | |
254 | .probe = s2mps11_clk_probe, | |
255 | .remove = s2mps11_clk_remove, | |
256 | .id_table = s2mps11_clk_id, | |
257 | }; | |
258 | ||
259 | static int __init s2mps11_clk_init(void) | |
260 | { | |
261 | return platform_driver_register(&s2mps11_clk_driver); | |
262 | } | |
263 | subsys_initcall(s2mps11_clk_init); | |
264 | ||
265 | static void __init s2mps11_clk_cleanup(void) | |
266 | { | |
267 | platform_driver_unregister(&s2mps11_clk_driver); | |
268 | } | |
269 | module_exit(s2mps11_clk_cleanup); | |
270 | ||
271 | MODULE_DESCRIPTION("S2MPS11 Clock Driver"); | |
272 | MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>"); | |
273 | MODULE_LICENSE("GPL"); |