1 /*
2 * clk-s2mps11.c - Clock driver for S2MPS11.
3 *
4 * Copyright (C) 2013,2014 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 */
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>
26 #include <linux/mfd/samsung/s2mps13.h>
27 #include <linux/mfd/samsung/s2mps14.h>
28 #include <linux/mfd/samsung/s5m8767.h>
29 #include <linux/mfd/samsung/core.h>
30
31 enum {
32 S2MPS11_CLK_AP = 0,
33 S2MPS11_CLK_CP,
34 S2MPS11_CLK_BT,
35 S2MPS11_CLKS_NUM,
36 };
37
38 struct s2mps11_clk {
39 struct sec_pmic_dev *iodev;
40 struct device_node *clk_np;
41 struct clk_hw hw;
42 struct clk *clk;
43 struct clk_lookup *lookup;
44 u32 mask;
45 unsigned int reg;
46 };
47
to_s2mps11_clk(struct clk_hw * hw)48 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
49 {
50 return container_of(hw, struct s2mps11_clk, hw);
51 }
52
s2mps11_clk_prepare(struct clk_hw * hw)53 static int s2mps11_clk_prepare(struct clk_hw *hw)
54 {
55 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
56
57 return regmap_update_bits(s2mps11->iodev->regmap_pmic,
58 s2mps11->reg,
59 s2mps11->mask, s2mps11->mask);
60 }
61
s2mps11_clk_unprepare(struct clk_hw * hw)62 static void s2mps11_clk_unprepare(struct clk_hw *hw)
63 {
64 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
65
66 regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
67 s2mps11->mask, ~s2mps11->mask);
68 }
69
s2mps11_clk_is_prepared(struct clk_hw * hw)70 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
71 {
72 int ret;
73 u32 val;
74 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
75
76 ret = regmap_read(s2mps11->iodev->regmap_pmic,
77 s2mps11->reg, &val);
78 if (ret < 0)
79 return -EINVAL;
80
81 return val & s2mps11->mask;
82 }
83
s2mps11_clk_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)84 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
85 unsigned long parent_rate)
86 {
87 return 32768;
88 }
89
90 static struct clk_ops s2mps11_clk_ops = {
91 .prepare = s2mps11_clk_prepare,
92 .unprepare = s2mps11_clk_unprepare,
93 .is_prepared = s2mps11_clk_is_prepared,
94 .recalc_rate = s2mps11_clk_recalc_rate,
95 };
96
97 /* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
98 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
99 [S2MPS11_CLK_AP] = {
100 .name = "s2mps11_ap",
101 .ops = &s2mps11_clk_ops,
102 },
103 [S2MPS11_CLK_CP] = {
104 .name = "s2mps11_cp",
105 .ops = &s2mps11_clk_ops,
106 },
107 [S2MPS11_CLK_BT] = {
108 .name = "s2mps11_bt",
109 .ops = &s2mps11_clk_ops,
110 },
111 };
112
s2mps11_clk_parse_dt(struct platform_device * pdev,struct clk_init_data * clks_init)113 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
114 struct clk_init_data *clks_init)
115 {
116 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
117 struct device_node *clk_np;
118 int i;
119
120 if (!iodev->dev->of_node)
121 return ERR_PTR(-EINVAL);
122
123 clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
124 if (!clk_np) {
125 dev_err(&pdev->dev, "could not find clock sub-node\n");
126 return ERR_PTR(-EINVAL);
127 }
128
129 for (i = 0; i < S2MPS11_CLKS_NUM; i++)
130 of_property_read_string_index(clk_np, "clock-output-names", i,
131 &clks_init[i].name);
132
133 return clk_np;
134 }
135
s2mps11_clk_probe(struct platform_device * pdev)136 static int s2mps11_clk_probe(struct platform_device *pdev)
137 {
138 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
139 struct s2mps11_clk *s2mps11_clks;
140 struct clk_hw_onecell_data *clk_data;
141 unsigned int s2mps11_reg;
142 int i, ret = 0;
143 enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data;
144
145 s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
146 sizeof(*s2mps11_clks), GFP_KERNEL);
147 if (!s2mps11_clks)
148 return -ENOMEM;
149
150 clk_data = devm_kzalloc(&pdev->dev,
151 struct_size(clk_data, hws, S2MPS11_CLKS_NUM),
152 GFP_KERNEL);
153 if (!clk_data)
154 return -ENOMEM;
155
156 switch (hwid) {
157 case S2MPS11X:
158 s2mps11_reg = S2MPS11_REG_RTC_CTRL;
159 break;
160 case S2MPS13X:
161 s2mps11_reg = S2MPS13_REG_RTCCTRL;
162 break;
163 case S2MPS14X:
164 s2mps11_reg = S2MPS14_REG_RTCCTRL;
165 break;
166 case S5M8767X:
167 s2mps11_reg = S5M8767_REG_CTRL1;
168 break;
169 default:
170 dev_err(&pdev->dev, "Invalid device type\n");
171 return -EINVAL;
172 }
173
174 /* Store clocks of_node in first element of s2mps11_clks array */
175 s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init);
176 if (IS_ERR(s2mps11_clks->clk_np))
177 return PTR_ERR(s2mps11_clks->clk_np);
178
179 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
180 if (i == S2MPS11_CLK_CP && hwid == S2MPS14X)
181 continue; /* Skip clocks not present in some devices */
182 s2mps11_clks[i].iodev = iodev;
183 s2mps11_clks[i].hw.init = &s2mps11_clks_init[i];
184 s2mps11_clks[i].mask = 1 << i;
185 s2mps11_clks[i].reg = s2mps11_reg;
186
187 s2mps11_clks[i].clk = devm_clk_register(&pdev->dev,
188 &s2mps11_clks[i].hw);
189 if (IS_ERR(s2mps11_clks[i].clk)) {
190 dev_err(&pdev->dev, "Fail to register : %s\n",
191 s2mps11_clks_init[i].name);
192 ret = PTR_ERR(s2mps11_clks[i].clk);
193 goto err_reg;
194 }
195
196 s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw,
197 s2mps11_clks_init[i].name, NULL);
198 if (!s2mps11_clks[i].lookup) {
199 ret = -ENOMEM;
200 goto err_reg;
201 }
202 clk_data->hws[i] = &s2mps11_clks[i].hw;
203 }
204
205 clk_data->num = S2MPS11_CLKS_NUM;
206 of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get,
207 clk_data);
208
209 platform_set_drvdata(pdev, s2mps11_clks);
210
211 return ret;
212
213 err_reg:
214 while (--i >= 0)
215 clkdev_drop(s2mps11_clks[i].lookup);
216
217 return ret;
218 }
219
s2mps11_clk_remove(struct platform_device * pdev)220 static int s2mps11_clk_remove(struct platform_device *pdev)
221 {
222 struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
223 int i;
224
225 of_clk_del_provider(s2mps11_clks[0].clk_np);
226 /* Drop the reference obtained in s2mps11_clk_parse_dt */
227 of_node_put(s2mps11_clks[0].clk_np);
228
229 for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
230 /* Skip clocks not present on S2MPS14 */
231 if (!s2mps11_clks[i].lookup)
232 continue;
233 clkdev_drop(s2mps11_clks[i].lookup);
234 }
235
236 return 0;
237 }
238
239 static const struct platform_device_id s2mps11_clk_id[] = {
240 { "s2mps11-clk", S2MPS11X},
241 { "s2mps13-clk", S2MPS13X},
242 { "s2mps14-clk", S2MPS14X},
243 { "s5m8767-clk", S5M8767X},
244 { },
245 };
246 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
247
248 static struct platform_driver s2mps11_clk_driver = {
249 .driver = {
250 .name = "s2mps11-clk",
251 },
252 .probe = s2mps11_clk_probe,
253 .remove = s2mps11_clk_remove,
254 .id_table = s2mps11_clk_id,
255 };
256
s2mps11_clk_init(void)257 static int __init s2mps11_clk_init(void)
258 {
259 return platform_driver_register(&s2mps11_clk_driver);
260 }
261 subsys_initcall(s2mps11_clk_init);
262
s2mps11_clk_cleanup(void)263 static void __exit s2mps11_clk_cleanup(void)
264 {
265 platform_driver_unregister(&s2mps11_clk_driver);
266 }
267 module_exit(s2mps11_clk_cleanup);
268
269 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
270 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
271 MODULE_LICENSE("GPL");
272
