1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/export.h>
7 #include <linux/module.h>
8 #include <linux/regmap.h>
9 #include <linux/platform_device.h>
10 #include <linux/clk-provider.h>
11 #include <linux/reset-controller.h>
12 #include <linux/of.h>
13
14 #include "common.h"
15 #include "clk-rcg.h"
16 #include "clk-regmap.h"
17 #include "reset.h"
18 #include "gdsc.h"
19
20 struct qcom_cc {
21 struct qcom_reset_controller reset;
22 struct clk_regmap **rclks;
23 size_t num_rclks;
24 };
25
26 const
qcom_find_freq(const struct freq_tbl * f,unsigned long rate)27 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
28 {
29 if (!f)
30 return NULL;
31
32 if (!f->freq)
33 return f;
34
35 for (; f->freq; f++)
36 if (rate <= f->freq)
37 return f;
38
39 /* Default to our fastest rate */
40 return f - 1;
41 }
42 EXPORT_SYMBOL_GPL(qcom_find_freq);
43
qcom_find_freq_multi(const struct freq_multi_tbl * f,unsigned long rate)44 const struct freq_multi_tbl *qcom_find_freq_multi(const struct freq_multi_tbl *f,
45 unsigned long rate)
46 {
47 if (!f)
48 return NULL;
49
50 if (!f->freq)
51 return f;
52
53 for (; f->freq; f++)
54 if (rate <= f->freq)
55 return f;
56
57 /* Default to our fastest rate */
58 return f - 1;
59 }
60 EXPORT_SYMBOL_GPL(qcom_find_freq_multi);
61
qcom_find_freq_floor(const struct freq_tbl * f,unsigned long rate)62 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
63 unsigned long rate)
64 {
65 const struct freq_tbl *best = NULL;
66
67 for ( ; f->freq; f++) {
68 if (rate >= f->freq)
69 best = f;
70 else
71 break;
72 }
73
74 return best;
75 }
76 EXPORT_SYMBOL_GPL(qcom_find_freq_floor);
77
qcom_find_src_index(struct clk_hw * hw,const struct parent_map * map,u8 src)78 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
79 {
80 int i, num_parents = clk_hw_get_num_parents(hw);
81
82 for (i = 0; i < num_parents; i++)
83 if (src == map[i].src)
84 return i;
85
86 return -ENOENT;
87 }
88 EXPORT_SYMBOL_GPL(qcom_find_src_index);
89
qcom_find_cfg_index(struct clk_hw * hw,const struct parent_map * map,u8 cfg)90 int qcom_find_cfg_index(struct clk_hw *hw, const struct parent_map *map, u8 cfg)
91 {
92 int i, num_parents = clk_hw_get_num_parents(hw);
93
94 for (i = 0; i < num_parents; i++)
95 if (cfg == map[i].cfg)
96 return i;
97
98 return -ENOENT;
99 }
100 EXPORT_SYMBOL_GPL(qcom_find_cfg_index);
101
102 struct regmap *
qcom_cc_map(struct platform_device * pdev,const struct qcom_cc_desc * desc)103 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
104 {
105 void __iomem *base;
106 struct device *dev = &pdev->dev;
107
108 base = devm_platform_ioremap_resource(pdev, 0);
109 if (IS_ERR(base))
110 return ERR_CAST(base);
111
112 return devm_regmap_init_mmio(dev, base, desc->config);
113 }
114 EXPORT_SYMBOL_GPL(qcom_cc_map);
115
116 void
qcom_pll_set_fsm_mode(struct regmap * map,u32 reg,u8 bias_count,u8 lock_count)117 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
118 {
119 u32 val;
120 u32 mask;
121
122 /* De-assert reset to FSM */
123 regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);
124
125 /* Program bias count and lock count */
126 val = bias_count << PLL_BIAS_COUNT_SHIFT |
127 lock_count << PLL_LOCK_COUNT_SHIFT;
128 mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
129 mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
130 regmap_update_bits(map, reg, mask, val);
131
132 /* Enable PLL FSM voting */
133 regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
134 }
135 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);
136
qcom_cc_gdsc_unregister(void * data)137 static void qcom_cc_gdsc_unregister(void *data)
138 {
139 gdsc_unregister(data);
140 }
141
142 /*
143 * Backwards compatibility with old DTs. Register a pass-through factor 1/1
144 * clock to translate 'path' clk into 'name' clk and register the 'path'
145 * clk as a fixed rate clock if it isn't present.
146 */
_qcom_cc_register_board_clk(struct device * dev,const char * path,const char * name,unsigned long rate,bool add_factor)147 static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
148 const char *name, unsigned long rate,
149 bool add_factor)
150 {
151 struct device_node *node = NULL;
152 struct device_node *clocks_node;
153 struct clk_fixed_factor *factor;
154 struct clk_fixed_rate *fixed;
155 struct clk_init_data init_data = { };
156 int ret;
157
158 clocks_node = of_find_node_by_path("/clocks");
159 if (clocks_node) {
160 node = of_get_child_by_name(clocks_node, path);
161 of_node_put(clocks_node);
162 }
163
164 if (!node) {
165 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
166 if (!fixed)
167 return -EINVAL;
168
169 fixed->fixed_rate = rate;
170 fixed->hw.init = &init_data;
171
172 init_data.name = path;
173 init_data.ops = &clk_fixed_rate_ops;
174
175 ret = devm_clk_hw_register(dev, &fixed->hw);
176 if (ret)
177 return ret;
178 }
179 of_node_put(node);
180
181 if (add_factor) {
182 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
183 if (!factor)
184 return -EINVAL;
185
186 factor->mult = factor->div = 1;
187 factor->hw.init = &init_data;
188
189 init_data.name = name;
190 init_data.parent_names = &path;
191 init_data.num_parents = 1;
192 init_data.flags = 0;
193 init_data.ops = &clk_fixed_factor_ops;
194
195 ret = devm_clk_hw_register(dev, &factor->hw);
196 if (ret)
197 return ret;
198 }
199
200 return 0;
201 }
202
qcom_cc_register_board_clk(struct device * dev,const char * path,const char * name,unsigned long rate)203 int qcom_cc_register_board_clk(struct device *dev, const char *path,
204 const char *name, unsigned long rate)
205 {
206 bool add_factor = true;
207
208 /*
209 * TODO: The RPM clock driver currently does not support the xo clock.
210 * When xo is added to the RPM clock driver, we should change this
211 * function to skip registration of xo factor clocks.
212 */
213
214 return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
215 }
216 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
217
qcom_cc_register_sleep_clk(struct device * dev)218 int qcom_cc_register_sleep_clk(struct device *dev)
219 {
220 return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
221 32768, true);
222 }
223 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
224
225 /* Drop 'protected-clocks' from the list of clocks to register */
qcom_cc_drop_protected(struct device * dev,struct qcom_cc * cc)226 static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc)
227 {
228 struct device_node *np = dev->of_node;
229 struct property *prop;
230 const __be32 *p;
231 u32 i;
232
233 of_property_for_each_u32(np, "protected-clocks", prop, p, i) {
234 if (i >= cc->num_rclks)
235 continue;
236
237 cc->rclks[i] = NULL;
238 }
239 }
240
qcom_cc_clk_hw_get(struct of_phandle_args * clkspec,void * data)241 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
242 void *data)
243 {
244 struct qcom_cc *cc = data;
245 unsigned int idx = clkspec->args[0];
246
247 if (idx >= cc->num_rclks) {
248 pr_err("%s: invalid index %u\n", __func__, idx);
249 return ERR_PTR(-EINVAL);
250 }
251
252 return cc->rclks[idx] ? &cc->rclks[idx]->hw : NULL;
253 }
254
qcom_cc_really_probe(struct platform_device * pdev,const struct qcom_cc_desc * desc,struct regmap * regmap)255 int qcom_cc_really_probe(struct platform_device *pdev,
256 const struct qcom_cc_desc *desc, struct regmap *regmap)
257 {
258 int i, ret;
259 struct device *dev = &pdev->dev;
260 struct qcom_reset_controller *reset;
261 struct qcom_cc *cc;
262 struct gdsc_desc *scd;
263 size_t num_clks = desc->num_clks;
264 struct clk_regmap **rclks = desc->clks;
265 size_t num_clk_hws = desc->num_clk_hws;
266 struct clk_hw **clk_hws = desc->clk_hws;
267
268 cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
269 if (!cc)
270 return -ENOMEM;
271
272 reset = &cc->reset;
273 reset->rcdev.of_node = dev->of_node;
274 reset->rcdev.ops = &qcom_reset_ops;
275 reset->rcdev.owner = dev->driver->owner;
276 reset->rcdev.nr_resets = desc->num_resets;
277 reset->regmap = regmap;
278 reset->reset_map = desc->resets;
279
280 ret = devm_reset_controller_register(dev, &reset->rcdev);
281 if (ret)
282 return ret;
283
284 if (desc->gdscs && desc->num_gdscs) {
285 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
286 if (!scd)
287 return -ENOMEM;
288 scd->dev = dev;
289 scd->scs = desc->gdscs;
290 scd->num = desc->num_gdscs;
291 ret = gdsc_register(scd, &reset->rcdev, regmap);
292 if (ret)
293 return ret;
294 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
295 scd);
296 if (ret)
297 return ret;
298 }
299
300 cc->rclks = rclks;
301 cc->num_rclks = num_clks;
302
303 qcom_cc_drop_protected(dev, cc);
304
305 for (i = 0; i < num_clk_hws; i++) {
306 ret = devm_clk_hw_register(dev, clk_hws[i]);
307 if (ret)
308 return ret;
309 }
310
311 for (i = 0; i < num_clks; i++) {
312 if (!rclks[i])
313 continue;
314
315 ret = devm_clk_register_regmap(dev, rclks[i]);
316 if (ret)
317 return ret;
318 }
319
320 ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc);
321 if (ret)
322 return ret;
323
324 return 0;
325 }
326 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
327
qcom_cc_probe(struct platform_device * pdev,const struct qcom_cc_desc * desc)328 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
329 {
330 struct regmap *regmap;
331
332 regmap = qcom_cc_map(pdev, desc);
333 if (IS_ERR(regmap))
334 return PTR_ERR(regmap);
335
336 return qcom_cc_really_probe(pdev, desc, regmap);
337 }
338 EXPORT_SYMBOL_GPL(qcom_cc_probe);
339
qcom_cc_probe_by_index(struct platform_device * pdev,int index,const struct qcom_cc_desc * desc)340 int qcom_cc_probe_by_index(struct platform_device *pdev, int index,
341 const struct qcom_cc_desc *desc)
342 {
343 struct regmap *regmap;
344 void __iomem *base;
345
346 base = devm_platform_ioremap_resource(pdev, index);
347 if (IS_ERR(base))
348 return -ENOMEM;
349
350 regmap = devm_regmap_init_mmio(&pdev->dev, base, desc->config);
351 if (IS_ERR(regmap))
352 return PTR_ERR(regmap);
353
354 return qcom_cc_really_probe(pdev, desc, regmap);
355 }
356 EXPORT_SYMBOL_GPL(qcom_cc_probe_by_index);
357
358 MODULE_LICENSE("GPL v2");
359