This source file includes following definitions.
- meson_clk_pll_data
- __pll_round_closest_mult
- __pll_params_to_rate
- meson_clk_pll_recalc_rate
- __pll_params_with_frac
- meson_clk_pll_is_better
- meson_clk_get_pll_table_index
- meson_clk_get_pll_range_m
- meson_clk_get_pll_range_index
- meson_clk_get_pll_get_index
- meson_clk_get_pll_settings
- meson_clk_pll_round_rate
- meson_clk_pll_wait_lock
- meson_clk_pll_init
- meson_clk_pll_is_enabled
- meson_clk_pcie_pll_enable
- meson_clk_pll_enable
- meson_clk_pll_disable
- meson_clk_pll_set_rate
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29 #include <linux/clk-provider.h>
30 #include <linux/delay.h>
31 #include <linux/err.h>
32 #include <linux/io.h>
33 #include <linux/math64.h>
34 #include <linux/module.h>
35 #include <linux/rational.h>
36
37 #include "clk-regmap.h"
38 #include "clk-pll.h"
39
40 static inline struct meson_clk_pll_data *
41 meson_clk_pll_data(struct clk_regmap *clk)
42 {
43 return (struct meson_clk_pll_data *)clk->data;
44 }
45
46 static int __pll_round_closest_mult(struct meson_clk_pll_data *pll)
47 {
48 if ((pll->flags & CLK_MESON_PLL_ROUND_CLOSEST) &&
49 !MESON_PARM_APPLICABLE(&pll->frac))
50 return 1;
51
52 return 0;
53 }
54
55 static unsigned long __pll_params_to_rate(unsigned long parent_rate,
56 unsigned int m, unsigned int n,
57 unsigned int frac,
58 struct meson_clk_pll_data *pll)
59 {
60 u64 rate = (u64)parent_rate * m;
61
62 if (frac && MESON_PARM_APPLICABLE(&pll->frac)) {
63 u64 frac_rate = (u64)parent_rate * frac;
64
65 rate += DIV_ROUND_UP_ULL(frac_rate,
66 (1 << pll->frac.width));
67 }
68
69 return DIV_ROUND_UP_ULL(rate, n);
70 }
71
72 static unsigned long meson_clk_pll_recalc_rate(struct clk_hw *hw,
73 unsigned long parent_rate)
74 {
75 struct clk_regmap *clk = to_clk_regmap(hw);
76 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
77 unsigned int m, n, frac;
78
79 n = meson_parm_read(clk->map, &pll->n);
80
81
82
83
84
85
86 if (n == 0)
87 return 0;
88
89 m = meson_parm_read(clk->map, &pll->m);
90
91 frac = MESON_PARM_APPLICABLE(&pll->frac) ?
92 meson_parm_read(clk->map, &pll->frac) :
93 0;
94
95 return __pll_params_to_rate(parent_rate, m, n, frac, pll);
96 }
97
98 static unsigned int __pll_params_with_frac(unsigned long rate,
99 unsigned long parent_rate,
100 unsigned int m,
101 unsigned int n,
102 struct meson_clk_pll_data *pll)
103 {
104 unsigned int frac_max = (1 << pll->frac.width);
105 u64 val = (u64)rate * n;
106
107
108 if (rate < parent_rate * m / n)
109 return 0;
110
111 if (pll->flags & CLK_MESON_PLL_ROUND_CLOSEST)
112 val = DIV_ROUND_CLOSEST_ULL(val * frac_max, parent_rate);
113 else
114 val = div_u64(val * frac_max, parent_rate);
115
116 val -= m * frac_max;
117
118 return min((unsigned int)val, (frac_max - 1));
119 }
120
121 static bool meson_clk_pll_is_better(unsigned long rate,
122 unsigned long best,
123 unsigned long now,
124 struct meson_clk_pll_data *pll)
125 {
126 if (__pll_round_closest_mult(pll)) {
127
128 if (abs(now - rate) < abs(best - rate))
129 return true;
130 } else {
131
132 if (now <= rate && best < now)
133 return true;
134 }
135
136 return false;
137 }
138
139 static int meson_clk_get_pll_table_index(unsigned int index,
140 unsigned int *m,
141 unsigned int *n,
142 struct meson_clk_pll_data *pll)
143 {
144 if (!pll->table[index].n)
145 return -EINVAL;
146
147 *m = pll->table[index].m;
148 *n = pll->table[index].n;
149
150 return 0;
151 }
152
153 static unsigned int meson_clk_get_pll_range_m(unsigned long rate,
154 unsigned long parent_rate,
155 unsigned int n,
156 struct meson_clk_pll_data *pll)
157 {
158 u64 val = (u64)rate * n;
159
160 if (__pll_round_closest_mult(pll))
161 return DIV_ROUND_CLOSEST_ULL(val, parent_rate);
162
163 return div_u64(val, parent_rate);
164 }
165
166 static int meson_clk_get_pll_range_index(unsigned long rate,
167 unsigned long parent_rate,
168 unsigned int index,
169 unsigned int *m,
170 unsigned int *n,
171 struct meson_clk_pll_data *pll)
172 {
173 *n = index + 1;
174
175
176 if (*n >= (1 << pll->n.width))
177 return -EINVAL;
178
179 if (*n == 1) {
180
181 if (rate <= pll->range->min * parent_rate) {
182 *m = pll->range->min;
183 return -ENODATA;
184 } else if (rate >= pll->range->max * parent_rate) {
185 *m = pll->range->max;
186 return -ENODATA;
187 }
188 }
189
190 *m = meson_clk_get_pll_range_m(rate, parent_rate, *n, pll);
191
192
193 if (*m >= (1 << pll->m.width))
194 return -EINVAL;
195
196 return 0;
197 }
198
199 static int meson_clk_get_pll_get_index(unsigned long rate,
200 unsigned long parent_rate,
201 unsigned int index,
202 unsigned int *m,
203 unsigned int *n,
204 struct meson_clk_pll_data *pll)
205 {
206 if (pll->range)
207 return meson_clk_get_pll_range_index(rate, parent_rate,
208 index, m, n, pll);
209 else if (pll->table)
210 return meson_clk_get_pll_table_index(index, m, n, pll);
211
212 return -EINVAL;
213 }
214
215 static int meson_clk_get_pll_settings(unsigned long rate,
216 unsigned long parent_rate,
217 unsigned int *best_m,
218 unsigned int *best_n,
219 struct meson_clk_pll_data *pll)
220 {
221 unsigned long best = 0, now = 0;
222 unsigned int i, m, n;
223 int ret;
224
225 for (i = 0, ret = 0; !ret; i++) {
226 ret = meson_clk_get_pll_get_index(rate, parent_rate,
227 i, &m, &n, pll);
228 if (ret == -EINVAL)
229 break;
230
231 now = __pll_params_to_rate(parent_rate, m, n, 0, pll);
232 if (meson_clk_pll_is_better(rate, best, now, pll)) {
233 best = now;
234 *best_m = m;
235 *best_n = n;
236
237 if (now == rate)
238 break;
239 }
240 }
241
242 return best ? 0 : -EINVAL;
243 }
244
245 static long meson_clk_pll_round_rate(struct clk_hw *hw, unsigned long rate,
246 unsigned long *parent_rate)
247 {
248 struct clk_regmap *clk = to_clk_regmap(hw);
249 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
250 unsigned int m, n, frac;
251 unsigned long round;
252 int ret;
253
254 ret = meson_clk_get_pll_settings(rate, *parent_rate, &m, &n, pll);
255 if (ret)
256 return meson_clk_pll_recalc_rate(hw, *parent_rate);
257
258 round = __pll_params_to_rate(*parent_rate, m, n, 0, pll);
259
260 if (!MESON_PARM_APPLICABLE(&pll->frac) || rate == round)
261 return round;
262
263
264
265
266
267 frac = __pll_params_with_frac(rate, *parent_rate, m, n, pll);
268
269 return __pll_params_to_rate(*parent_rate, m, n, frac, pll);
270 }
271
272 static int meson_clk_pll_wait_lock(struct clk_hw *hw)
273 {
274 struct clk_regmap *clk = to_clk_regmap(hw);
275 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
276 int delay = 24000000;
277
278 do {
279
280 if (meson_parm_read(clk->map, &pll->l))
281 return 0;
282
283 delay--;
284 } while (delay > 0);
285
286 return -ETIMEDOUT;
287 }
288
289 static void meson_clk_pll_init(struct clk_hw *hw)
290 {
291 struct clk_regmap *clk = to_clk_regmap(hw);
292 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
293
294 if (pll->init_count) {
295 meson_parm_write(clk->map, &pll->rst, 1);
296 regmap_multi_reg_write(clk->map, pll->init_regs,
297 pll->init_count);
298 meson_parm_write(clk->map, &pll->rst, 0);
299 }
300 }
301
302 static int meson_clk_pll_is_enabled(struct clk_hw *hw)
303 {
304 struct clk_regmap *clk = to_clk_regmap(hw);
305 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
306
307 if (meson_parm_read(clk->map, &pll->rst) ||
308 !meson_parm_read(clk->map, &pll->en) ||
309 !meson_parm_read(clk->map, &pll->l))
310 return 0;
311
312 return 1;
313 }
314
315 static int meson_clk_pcie_pll_enable(struct clk_hw *hw)
316 {
317 meson_clk_pll_init(hw);
318
319 if (meson_clk_pll_wait_lock(hw))
320 return -EIO;
321
322 return 0;
323 }
324
325 static int meson_clk_pll_enable(struct clk_hw *hw)
326 {
327 struct clk_regmap *clk = to_clk_regmap(hw);
328 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
329
330
331 if (clk_hw_is_enabled(hw))
332 return 0;
333
334
335 meson_parm_write(clk->map, &pll->rst, 1);
336
337
338 meson_parm_write(clk->map, &pll->en, 1);
339
340
341 meson_parm_write(clk->map, &pll->rst, 0);
342
343 if (meson_clk_pll_wait_lock(hw))
344 return -EIO;
345
346 return 0;
347 }
348
349 static void meson_clk_pll_disable(struct clk_hw *hw)
350 {
351 struct clk_regmap *clk = to_clk_regmap(hw);
352 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
353
354
355 meson_parm_write(clk->map, &pll->rst, 1);
356
357
358 meson_parm_write(clk->map, &pll->en, 0);
359 }
360
361 static int meson_clk_pll_set_rate(struct clk_hw *hw, unsigned long rate,
362 unsigned long parent_rate)
363 {
364 struct clk_regmap *clk = to_clk_regmap(hw);
365 struct meson_clk_pll_data *pll = meson_clk_pll_data(clk);
366 unsigned int enabled, m, n, frac = 0, ret;
367 unsigned long old_rate;
368
369 if (parent_rate == 0 || rate == 0)
370 return -EINVAL;
371
372 old_rate = rate;
373
374 ret = meson_clk_get_pll_settings(rate, parent_rate, &m, &n, pll);
375 if (ret)
376 return ret;
377
378 enabled = meson_parm_read(clk->map, &pll->en);
379 if (enabled)
380 meson_clk_pll_disable(hw);
381
382 meson_parm_write(clk->map, &pll->n, n);
383 meson_parm_write(clk->map, &pll->m, m);
384
385 if (MESON_PARM_APPLICABLE(&pll->frac)) {
386 frac = __pll_params_with_frac(rate, parent_rate, m, n, pll);
387 meson_parm_write(clk->map, &pll->frac, frac);
388 }
389
390
391 if (!enabled)
392 return 0;
393
394 if (meson_clk_pll_enable(hw)) {
395 pr_warn("%s: pll did not lock, trying to restore old rate %lu\n",
396 __func__, old_rate);
397
398
399
400
401
402
403 meson_clk_pll_set_rate(hw, old_rate, parent_rate);
404 }
405
406 return 0;
407 }
408
409
410
411
412
413
414
415
416 const struct clk_ops meson_clk_pcie_pll_ops = {
417 .recalc_rate = meson_clk_pll_recalc_rate,
418 .round_rate = meson_clk_pll_round_rate,
419 .is_enabled = meson_clk_pll_is_enabled,
420 .enable = meson_clk_pcie_pll_enable,
421 .disable = meson_clk_pll_disable
422 };
423 EXPORT_SYMBOL_GPL(meson_clk_pcie_pll_ops);
424
425 const struct clk_ops meson_clk_pll_ops = {
426 .init = meson_clk_pll_init,
427 .recalc_rate = meson_clk_pll_recalc_rate,
428 .round_rate = meson_clk_pll_round_rate,
429 .set_rate = meson_clk_pll_set_rate,
430 .is_enabled = meson_clk_pll_is_enabled,
431 .enable = meson_clk_pll_enable,
432 .disable = meson_clk_pll_disable
433 };
434 EXPORT_SYMBOL_GPL(meson_clk_pll_ops);
435
436 const struct clk_ops meson_clk_pll_ro_ops = {
437 .recalc_rate = meson_clk_pll_recalc_rate,
438 .is_enabled = meson_clk_pll_is_enabled,
439 };
440 EXPORT_SYMBOL_GPL(meson_clk_pll_ro_ops);
441
442 MODULE_DESCRIPTION("Amlogic PLL driver");
443 MODULE_AUTHOR("Carlo Caione <carlo@endlessm.com>");
444 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
445 MODULE_LICENSE("GPL v2");