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