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49fc825f SB |
1 | /* |
2 | * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. | |
3 | * | |
4 | * This software is licensed under the terms of the GNU General Public | |
5 | * License version 2, as published by the Free Software Foundation, and | |
6 | * may be copied, distributed, and modified under those terms. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/export.h> | |
169f05e8 | 15 | #include <linux/module.h> |
49fc825f SB |
16 | #include <linux/regmap.h> |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/clk-provider.h> | |
19 | #include <linux/reset-controller.h> | |
ee15faff | 20 | #include <linux/of.h> |
49fc825f SB |
21 | |
22 | #include "common.h" | |
50c6a503 | 23 | #include "clk-rcg.h" |
49fc825f SB |
24 | #include "clk-regmap.h" |
25 | #include "reset.h" | |
5e5cc241 | 26 | #include "gdsc.h" |
49fc825f SB |
27 | |
28 | struct qcom_cc { | |
29 | struct qcom_reset_controller reset; | |
120c1552 SB |
30 | struct clk_regmap **rclks; |
31 | size_t num_rclks; | |
49fc825f SB |
32 | }; |
33 | ||
50c6a503 SB |
34 | const |
35 | struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate) | |
36 | { | |
37 | if (!f) | |
38 | return NULL; | |
39 | ||
40 | for (; f->freq; f++) | |
41 | if (rate <= f->freq) | |
42 | return f; | |
43 | ||
44 | /* Default to our fastest rate */ | |
45 | return f - 1; | |
46 | } | |
47 | EXPORT_SYMBOL_GPL(qcom_find_freq); | |
48 | ||
293d2e97 GD |
49 | int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src) |
50 | { | |
497295af | 51 | int i, num_parents = clk_hw_get_num_parents(hw); |
293d2e97 GD |
52 | |
53 | for (i = 0; i < num_parents; i++) | |
54 | if (src == map[i].src) | |
55 | return i; | |
56 | ||
57 | return -ENOENT; | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(qcom_find_src_index); | |
60 | ||
5b6b7490 SB |
61 | struct regmap * |
62 | qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) | |
49fc825f SB |
63 | { |
64 | void __iomem *base; | |
65 | struct resource *res; | |
5b6b7490 SB |
66 | struct device *dev = &pdev->dev; |
67 | ||
68 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
69 | base = devm_ioremap_resource(dev, res); | |
70 | if (IS_ERR(base)) | |
71 | return ERR_CAST(base); | |
72 | ||
73 | return devm_regmap_init_mmio(dev, base, desc->config); | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(qcom_cc_map); | |
76 | ||
94c51f40 SB |
77 | static void qcom_cc_del_clk_provider(void *data) |
78 | { | |
79 | of_clk_del_provider(data); | |
80 | } | |
81 | ||
82 | static void qcom_cc_reset_unregister(void *data) | |
83 | { | |
84 | reset_controller_unregister(data); | |
85 | } | |
86 | ||
87 | static void qcom_cc_gdsc_unregister(void *data) | |
88 | { | |
89 | gdsc_unregister(data); | |
90 | } | |
91 | ||
ee15faff SB |
92 | /* |
93 | * Backwards compatibility with old DTs. Register a pass-through factor 1/1 | |
94 | * clock to translate 'path' clk into 'name' clk and regsiter the 'path' | |
95 | * clk as a fixed rate clock if it isn't present. | |
96 | */ | |
97 | static int _qcom_cc_register_board_clk(struct device *dev, const char *path, | |
98 | const char *name, unsigned long rate, | |
99 | bool add_factor) | |
100 | { | |
101 | struct device_node *node = NULL; | |
102 | struct device_node *clocks_node; | |
103 | struct clk_fixed_factor *factor; | |
104 | struct clk_fixed_rate *fixed; | |
ee15faff | 105 | struct clk_init_data init_data = { }; |
120c1552 | 106 | int ret; |
ee15faff SB |
107 | |
108 | clocks_node = of_find_node_by_path("/clocks"); | |
109 | if (clocks_node) | |
110 | node = of_find_node_by_name(clocks_node, path); | |
111 | of_node_put(clocks_node); | |
112 | ||
113 | if (!node) { | |
114 | fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL); | |
115 | if (!fixed) | |
116 | return -EINVAL; | |
117 | ||
118 | fixed->fixed_rate = rate; | |
119 | fixed->hw.init = &init_data; | |
120 | ||
121 | init_data.name = path; | |
ee15faff SB |
122 | init_data.ops = &clk_fixed_rate_ops; |
123 | ||
120c1552 SB |
124 | ret = devm_clk_hw_register(dev, &fixed->hw); |
125 | if (ret) | |
126 | return ret; | |
ee15faff SB |
127 | } |
128 | of_node_put(node); | |
129 | ||
130 | if (add_factor) { | |
131 | factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL); | |
132 | if (!factor) | |
133 | return -EINVAL; | |
134 | ||
135 | factor->mult = factor->div = 1; | |
136 | factor->hw.init = &init_data; | |
137 | ||
138 | init_data.name = name; | |
139 | init_data.parent_names = &path; | |
140 | init_data.num_parents = 1; | |
141 | init_data.flags = 0; | |
142 | init_data.ops = &clk_fixed_factor_ops; | |
143 | ||
120c1552 SB |
144 | ret = devm_clk_hw_register(dev, &factor->hw); |
145 | if (ret) | |
146 | return ret; | |
ee15faff SB |
147 | } |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | int qcom_cc_register_board_clk(struct device *dev, const char *path, | |
153 | const char *name, unsigned long rate) | |
154 | { | |
155 | bool add_factor = true; | |
156 | struct device_node *node; | |
157 | ||
158 | /* The RPM clock driver will add the factor clock if present */ | |
159 | if (IS_ENABLED(CONFIG_QCOM_RPMCC)) { | |
160 | node = of_find_compatible_node(NULL, NULL, "qcom,rpmcc"); | |
161 | if (of_device_is_available(node)) | |
162 | add_factor = false; | |
163 | of_node_put(node); | |
164 | } | |
165 | ||
166 | return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor); | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk); | |
169 | ||
170 | int qcom_cc_register_sleep_clk(struct device *dev) | |
171 | { | |
172 | return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src", | |
173 | 32768, true); | |
174 | } | |
175 | EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk); | |
176 | ||
120c1552 SB |
177 | static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec, |
178 | void *data) | |
179 | { | |
180 | struct qcom_cc *cc = data; | |
181 | unsigned int idx = clkspec->args[0]; | |
182 | ||
183 | if (idx >= cc->num_rclks) { | |
184 | pr_err("%s: invalid index %u\n", __func__, idx); | |
185 | return ERR_PTR(-EINVAL); | |
186 | } | |
187 | ||
188 | return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT); | |
189 | } | |
190 | ||
5b6b7490 SB |
191 | int qcom_cc_really_probe(struct platform_device *pdev, |
192 | const struct qcom_cc_desc *desc, struct regmap *regmap) | |
193 | { | |
49fc825f SB |
194 | int i, ret; |
195 | struct device *dev = &pdev->dev; | |
49fc825f SB |
196 | struct qcom_reset_controller *reset; |
197 | struct qcom_cc *cc; | |
c2c7f0a4 | 198 | struct gdsc_desc *scd; |
49fc825f SB |
199 | size_t num_clks = desc->num_clks; |
200 | struct clk_regmap **rclks = desc->clks; | |
201 | ||
120c1552 | 202 | cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL); |
49fc825f SB |
203 | if (!cc) |
204 | return -ENOMEM; | |
205 | ||
120c1552 SB |
206 | cc->rclks = rclks; |
207 | cc->num_rclks = num_clks; | |
49fc825f SB |
208 | |
209 | for (i = 0; i < num_clks; i++) { | |
120c1552 | 210 | if (!rclks[i]) |
49fc825f | 211 | continue; |
120c1552 SB |
212 | |
213 | ret = devm_clk_register_regmap(dev, rclks[i]); | |
214 | if (ret) | |
215 | return ret; | |
49fc825f SB |
216 | } |
217 | ||
120c1552 | 218 | ret = of_clk_add_hw_provider(dev->of_node, qcom_cc_clk_hw_get, cc); |
49fc825f SB |
219 | if (ret) |
220 | return ret; | |
221 | ||
66f5ce25 SM |
222 | ret = devm_add_action_or_reset(dev, qcom_cc_del_clk_provider, |
223 | pdev->dev.of_node); | |
224 | ||
225 | if (ret) | |
226 | return ret; | |
94c51f40 | 227 | |
49fc825f SB |
228 | reset = &cc->reset; |
229 | reset->rcdev.of_node = dev->of_node; | |
230 | reset->rcdev.ops = &qcom_reset_ops; | |
231 | reset->rcdev.owner = dev->driver->owner; | |
232 | reset->rcdev.nr_resets = desc->num_resets; | |
233 | reset->regmap = regmap; | |
234 | reset->reset_map = desc->resets; | |
49fc825f SB |
235 | |
236 | ret = reset_controller_register(&reset->rcdev); | |
237 | if (ret) | |
94c51f40 SB |
238 | return ret; |
239 | ||
66f5ce25 SM |
240 | ret = devm_add_action_or_reset(dev, qcom_cc_reset_unregister, |
241 | &reset->rcdev); | |
242 | ||
243 | if (ret) | |
244 | return ret; | |
49fc825f | 245 | |
5e5cc241 | 246 | if (desc->gdscs && desc->num_gdscs) { |
c2c7f0a4 RN |
247 | scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL); |
248 | if (!scd) | |
249 | return -ENOMEM; | |
250 | scd->dev = dev; | |
251 | scd->scs = desc->gdscs; | |
252 | scd->num = desc->num_gdscs; | |
253 | ret = gdsc_register(scd, &reset->rcdev, regmap); | |
254 | if (ret) | |
255 | return ret; | |
256 | ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister, | |
257 | scd); | |
5e5cc241 | 258 | if (ret) |
94c51f40 | 259 | return ret; |
5e5cc241 RN |
260 | } |
261 | ||
c2c7f0a4 | 262 | return 0; |
49fc825f | 263 | } |
5b6b7490 SB |
264 | EXPORT_SYMBOL_GPL(qcom_cc_really_probe); |
265 | ||
266 | int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) | |
267 | { | |
268 | struct regmap *regmap; | |
269 | ||
270 | regmap = qcom_cc_map(pdev, desc); | |
271 | if (IS_ERR(regmap)) | |
272 | return PTR_ERR(regmap); | |
273 | ||
274 | return qcom_cc_really_probe(pdev, desc, regmap); | |
275 | } | |
49fc825f SB |
276 | EXPORT_SYMBOL_GPL(qcom_cc_probe); |
277 | ||
169f05e8 | 278 | MODULE_LICENSE("GPL v2"); |