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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> | |
f928b53d | 26 | #include <linux/mfd/samsung/s2mps13.h> |
e8b60a45 | 27 | #include <linux/mfd/samsung/s2mps14.h> |
e8e6b840 | 28 | #include <linux/mfd/samsung/s5m8767.h> |
7cc560de YSB |
29 | #include <linux/mfd/samsung/core.h> |
30 | ||
7cc560de YSB |
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; | |
bf416bd4 | 40 | struct device_node *clk_np; |
7cc560de YSB |
41 | struct clk_hw hw; |
42 | struct clk *clk; | |
43 | struct clk_lookup *lookup; | |
44 | u32 mask; | |
64d64c35 | 45 | unsigned int reg; |
7cc560de YSB |
46 | }; |
47 | ||
48 | static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw) | |
49 | { | |
50 | return container_of(hw, struct s2mps11_clk, hw); | |
51 | } | |
52 | ||
53 | static int s2mps11_clk_prepare(struct clk_hw *hw) | |
54 | { | |
55 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
7cc560de | 56 | |
7764d0cd | 57 | return regmap_update_bits(s2mps11->iodev->regmap_pmic, |
64d64c35 | 58 | s2mps11->reg, |
7cc560de | 59 | s2mps11->mask, s2mps11->mask); |
7cc560de YSB |
60 | } |
61 | ||
62 | static void s2mps11_clk_unprepare(struct clk_hw *hw) | |
63 | { | |
64 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); | |
7cc560de | 65 | |
7764d0cd | 66 | regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg, |
7cc560de | 67 | s2mps11->mask, ~s2mps11->mask); |
7cc560de YSB |
68 | } |
69 | ||
89ed7e6e | 70 | static int s2mps11_clk_is_prepared(struct clk_hw *hw) |
7cc560de | 71 | { |
89ed7e6e KW |
72 | int ret; |
73 | u32 val; | |
7cc560de YSB |
74 | struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); |
75 | ||
89ed7e6e KW |
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; | |
7cc560de YSB |
82 | } |
83 | ||
84 | static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, | |
85 | unsigned long parent_rate) | |
86 | { | |
89ed7e6e | 87 | return 32768; |
7cc560de YSB |
88 | } |
89 | ||
90 | static struct clk_ops s2mps11_clk_ops = { | |
91 | .prepare = s2mps11_clk_prepare, | |
92 | .unprepare = s2mps11_clk_unprepare, | |
89ed7e6e | 93 | .is_prepared = s2mps11_clk_is_prepared, |
7cc560de YSB |
94 | .recalc_rate = s2mps11_clk_recalc_rate, |
95 | }; | |
96 | ||
31ad0e2a | 97 | /* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */ |
7cc560de YSB |
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 | .flags = CLK_IS_ROOT, | |
103 | }, | |
104 | [S2MPS11_CLK_CP] = { | |
105 | .name = "s2mps11_cp", | |
106 | .ops = &s2mps11_clk_ops, | |
107 | .flags = CLK_IS_ROOT, | |
108 | }, | |
109 | [S2MPS11_CLK_BT] = { | |
110 | .name = "s2mps11_bt", | |
111 | .ops = &s2mps11_clk_ops, | |
112 | .flags = CLK_IS_ROOT, | |
113 | }, | |
114 | }; | |
115 | ||
e8b60a45 KK |
116 | static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev, |
117 | struct clk_init_data *clks_init) | |
7cc560de YSB |
118 | { |
119 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
120 | struct device_node *clk_np; | |
121 | int i; | |
122 | ||
123 | if (!iodev->dev->of_node) | |
238e1405 | 124 | return ERR_PTR(-EINVAL); |
7cc560de | 125 | |
afbd1a0c | 126 | clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks"); |
7cc560de YSB |
127 | if (!clk_np) { |
128 | dev_err(&pdev->dev, "could not find clock sub-node\n"); | |
129 | return ERR_PTR(-EINVAL); | |
130 | } | |
131 | ||
31ad0e2a | 132 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) |
7cc560de | 133 | of_property_read_string_index(clk_np, "clock-output-names", i, |
e8b60a45 | 134 | &clks_init[i].name); |
7cc560de YSB |
135 | |
136 | return clk_np; | |
137 | } | |
138 | ||
139 | static int s2mps11_clk_probe(struct platform_device *pdev) | |
140 | { | |
141 | struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
dedbb272 | 142 | struct s2mps11_clk *s2mps11_clks; |
36da4def | 143 | struct clk_onecell_data *clk_data; |
64d64c35 | 144 | unsigned int s2mps11_reg; |
7cc560de | 145 | int i, ret = 0; |
31ad0e2a | 146 | enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data; |
7cc560de | 147 | |
7764d0cd | 148 | s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM, |
dedbb272 | 149 | sizeof(*s2mps11_clks), GFP_KERNEL); |
7cc560de YSB |
150 | if (!s2mps11_clks) |
151 | return -ENOMEM; | |
152 | ||
36da4def AS |
153 | clk_data = devm_kzalloc(&pdev->dev, sizeof(*clk_data), GFP_KERNEL); |
154 | if (!clk_data) | |
155 | return -ENOMEM; | |
156 | ||
157 | clk_data->clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM, | |
7764d0cd | 158 | sizeof(struct clk *), GFP_KERNEL); |
36da4def | 159 | if (!clk_data->clks) |
7002483c KK |
160 | return -ENOMEM; |
161 | ||
31ad0e2a | 162 | switch (hwid) { |
64d64c35 TB |
163 | case S2MPS11X: |
164 | s2mps11_reg = S2MPS11_REG_RTC_CTRL; | |
e8b60a45 | 165 | break; |
f928b53d CC |
166 | case S2MPS13X: |
167 | s2mps11_reg = S2MPS13_REG_RTCCTRL; | |
f928b53d | 168 | break; |
e8b60a45 KK |
169 | case S2MPS14X: |
170 | s2mps11_reg = S2MPS14_REG_RTCCTRL; | |
64d64c35 | 171 | break; |
e8e6b840 TB |
172 | case S5M8767X: |
173 | s2mps11_reg = S5M8767_REG_CTRL1; | |
174 | break; | |
64d64c35 TB |
175 | default: |
176 | dev_err(&pdev->dev, "Invalid device type\n"); | |
177 | return -EINVAL; | |
250d07d1 | 178 | } |
64d64c35 | 179 | |
e8b60a45 | 180 | /* Store clocks of_node in first element of s2mps11_clks array */ |
31ad0e2a | 181 | s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init); |
e8b60a45 KK |
182 | if (IS_ERR(s2mps11_clks->clk_np)) |
183 | return PTR_ERR(s2mps11_clks->clk_np); | |
184 | ||
dedbb272 | 185 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
31ad0e2a | 186 | if (i == S2MPS11_CLK_CP && hwid == S2MPS14X) |
e8b60a45 | 187 | continue; /* Skip clocks not present in some devices */ |
dedbb272 AS |
188 | s2mps11_clks[i].iodev = iodev; |
189 | s2mps11_clks[i].hw.init = &s2mps11_clks_init[i]; | |
190 | s2mps11_clks[i].mask = 1 << i; | |
191 | s2mps11_clks[i].reg = s2mps11_reg; | |
192 | ||
193 | s2mps11_clks[i].clk = devm_clk_register(&pdev->dev, | |
194 | &s2mps11_clks[i].hw); | |
195 | if (IS_ERR(s2mps11_clks[i].clk)) { | |
7cc560de | 196 | dev_err(&pdev->dev, "Fail to register : %s\n", |
dedbb272 AS |
197 | s2mps11_clks_init[i].name); |
198 | ret = PTR_ERR(s2mps11_clks[i].clk); | |
7cc560de YSB |
199 | goto err_reg; |
200 | } | |
201 | ||
dedbb272 AS |
202 | s2mps11_clks[i].lookup = clkdev_create(s2mps11_clks[i].clk, |
203 | s2mps11_clks_init[i].name, NULL); | |
204 | if (!s2mps11_clks[i].lookup) { | |
7cc560de | 205 | ret = -ENOMEM; |
264e3b75 | 206 | goto err_reg; |
7cc560de | 207 | } |
36da4def | 208 | clk_data->clks[i] = s2mps11_clks[i].clk; |
e8b60a45 | 209 | } |
7cc560de | 210 | |
36da4def | 211 | clk_data->clk_num = S2MPS11_CLKS_NUM; |
7002483c | 212 | of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get, |
36da4def | 213 | clk_data); |
7cc560de YSB |
214 | |
215 | platform_set_drvdata(pdev, s2mps11_clks); | |
216 | ||
217 | return ret; | |
264e3b75 | 218 | |
7cc560de | 219 | err_reg: |
264e3b75 AL |
220 | while (--i >= 0) |
221 | clkdev_drop(s2mps11_clks[i].lookup); | |
7cc560de YSB |
222 | |
223 | return ret; | |
224 | } | |
225 | ||
226 | static int s2mps11_clk_remove(struct platform_device *pdev) | |
227 | { | |
228 | struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev); | |
229 | int i; | |
230 | ||
bf416bd4 KK |
231 | of_clk_del_provider(s2mps11_clks[0].clk_np); |
232 | /* Drop the reference obtained in s2mps11_clk_parse_dt */ | |
233 | of_node_put(s2mps11_clks[0].clk_np); | |
234 | ||
e8b60a45 KK |
235 | for (i = 0; i < S2MPS11_CLKS_NUM; i++) { |
236 | /* Skip clocks not present on S2MPS14 */ | |
237 | if (!s2mps11_clks[i].lookup) | |
238 | continue; | |
7cc560de | 239 | clkdev_drop(s2mps11_clks[i].lookup); |
e8b60a45 | 240 | } |
7cc560de YSB |
241 | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static const struct platform_device_id s2mps11_clk_id[] = { | |
64d64c35 | 246 | { "s2mps11-clk", S2MPS11X}, |
f928b53d | 247 | { "s2mps13-clk", S2MPS13X}, |
e8b60a45 | 248 | { "s2mps14-clk", S2MPS14X}, |
e8e6b840 | 249 | { "s5m8767-clk", S5M8767X}, |
7cc560de YSB |
250 | { }, |
251 | }; | |
252 | MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); | |
253 | ||
254 | static struct platform_driver s2mps11_clk_driver = { | |
255 | .driver = { | |
256 | .name = "s2mps11-clk", | |
7cc560de YSB |
257 | }, |
258 | .probe = s2mps11_clk_probe, | |
259 | .remove = s2mps11_clk_remove, | |
260 | .id_table = s2mps11_clk_id, | |
261 | }; | |
262 | ||
263 | static int __init s2mps11_clk_init(void) | |
264 | { | |
265 | return platform_driver_register(&s2mps11_clk_driver); | |
266 | } | |
267 | subsys_initcall(s2mps11_clk_init); | |
268 | ||
7764d0cd | 269 | static void __exit s2mps11_clk_cleanup(void) |
7cc560de YSB |
270 | { |
271 | platform_driver_unregister(&s2mps11_clk_driver); | |
272 | } | |
273 | module_exit(s2mps11_clk_cleanup); | |
274 | ||
275 | MODULE_DESCRIPTION("S2MPS11 Clock Driver"); | |
276 | MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>"); | |
277 | MODULE_LICENSE("GPL"); |