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ee81f4ee CX |
1 | /* |
2 | * mmp mix(div and mux) clock operation source file | |
3 | * | |
4 | * Copyright (C) 2014 Marvell | |
5 | * Chao Xie <chao.xie@marvell.com> | |
6 | * | |
7 | * This file is licensed under the terms of the GNU General Public | |
8 | * License version 2. This program is licensed "as is" without any | |
9 | * warranty of any kind, whether express or implied. | |
10 | */ | |
11 | ||
12 | #include <linux/clk-provider.h> | |
13 | #include <linux/slab.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/err.h> | |
16 | ||
17 | #include "clk.h" | |
18 | ||
19 | /* | |
20 | * The mix clock is a clock combined mux and div type clock. | |
21 | * Because the div field and mux field need to be set at same | |
22 | * time, we can not divide it into 2 types of clock | |
23 | */ | |
24 | ||
25 | #define to_clk_mix(hw) container_of(hw, struct mmp_clk_mix, hw) | |
26 | ||
27 | static unsigned int _get_maxdiv(struct mmp_clk_mix *mix) | |
28 | { | |
29 | unsigned int div_mask = (1 << mix->reg_info.width_div) - 1; | |
30 | unsigned int maxdiv = 0; | |
31 | struct clk_div_table *clkt; | |
32 | ||
33 | if (mix->div_flags & CLK_DIVIDER_ONE_BASED) | |
34 | return div_mask; | |
35 | if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO) | |
36 | return 1 << div_mask; | |
37 | if (mix->div_table) { | |
38 | for (clkt = mix->div_table; clkt->div; clkt++) | |
39 | if (clkt->div > maxdiv) | |
40 | maxdiv = clkt->div; | |
41 | return maxdiv; | |
42 | } | |
43 | return div_mask + 1; | |
44 | } | |
45 | ||
46 | static unsigned int _get_div(struct mmp_clk_mix *mix, unsigned int val) | |
47 | { | |
48 | struct clk_div_table *clkt; | |
49 | ||
50 | if (mix->div_flags & CLK_DIVIDER_ONE_BASED) | |
51 | return val; | |
52 | if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO) | |
53 | return 1 << val; | |
54 | if (mix->div_table) { | |
55 | for (clkt = mix->div_table; clkt->div; clkt++) | |
56 | if (clkt->val == val) | |
57 | return clkt->div; | |
58 | if (clkt->div == 0) | |
59 | return 0; | |
60 | } | |
61 | return val + 1; | |
62 | } | |
63 | ||
64 | static unsigned int _get_mux(struct mmp_clk_mix *mix, unsigned int val) | |
65 | { | |
66 | int num_parents = __clk_get_num_parents(mix->hw.clk); | |
67 | int i; | |
68 | ||
69 | if (mix->mux_flags & CLK_MUX_INDEX_BIT) | |
70 | return ffs(val) - 1; | |
71 | if (mix->mux_flags & CLK_MUX_INDEX_ONE) | |
72 | return val - 1; | |
73 | if (mix->mux_table) { | |
74 | for (i = 0; i < num_parents; i++) | |
75 | if (mix->mux_table[i] == val) | |
76 | return i; | |
77 | if (i == num_parents) | |
78 | return 0; | |
79 | } | |
80 | ||
81 | return val; | |
82 | } | |
83 | static unsigned int _get_div_val(struct mmp_clk_mix *mix, unsigned int div) | |
84 | { | |
85 | struct clk_div_table *clkt; | |
86 | ||
87 | if (mix->div_flags & CLK_DIVIDER_ONE_BASED) | |
88 | return div; | |
89 | if (mix->div_flags & CLK_DIVIDER_POWER_OF_TWO) | |
90 | return __ffs(div); | |
91 | if (mix->div_table) { | |
92 | for (clkt = mix->div_table; clkt->div; clkt++) | |
93 | if (clkt->div == div) | |
94 | return clkt->val; | |
95 | if (clkt->div == 0) | |
96 | return 0; | |
97 | } | |
98 | ||
99 | return div - 1; | |
100 | } | |
101 | ||
102 | static unsigned int _get_mux_val(struct mmp_clk_mix *mix, unsigned int mux) | |
103 | { | |
104 | if (mix->mux_table) | |
105 | return mix->mux_table[mux]; | |
106 | ||
107 | return mux; | |
108 | } | |
109 | ||
110 | static void _filter_clk_table(struct mmp_clk_mix *mix, | |
111 | struct mmp_clk_mix_clk_table *table, | |
112 | unsigned int table_size) | |
113 | { | |
114 | int i; | |
115 | struct mmp_clk_mix_clk_table *item; | |
116 | struct clk *parent, *clk; | |
117 | unsigned long parent_rate; | |
118 | ||
119 | clk = mix->hw.clk; | |
120 | ||
121 | for (i = 0; i < table_size; i++) { | |
122 | item = &table[i]; | |
123 | parent = clk_get_parent_by_index(clk, item->parent_index); | |
124 | parent_rate = __clk_get_rate(parent); | |
125 | if (parent_rate % item->rate) { | |
126 | item->valid = 0; | |
127 | } else { | |
128 | item->divisor = parent_rate / item->rate; | |
129 | item->valid = 1; | |
130 | } | |
131 | } | |
132 | } | |
133 | ||
134 | static int _set_rate(struct mmp_clk_mix *mix, u32 mux_val, u32 div_val, | |
135 | unsigned int change_mux, unsigned int change_div) | |
136 | { | |
137 | struct mmp_clk_mix_reg_info *ri = &mix->reg_info; | |
138 | u8 width, shift; | |
139 | u32 mux_div, fc_req; | |
140 | int ret, timeout = 50; | |
141 | unsigned long flags = 0; | |
142 | ||
143 | if (!change_mux && !change_div) | |
144 | return -EINVAL; | |
145 | ||
146 | if (mix->lock) | |
147 | spin_lock_irqsave(mix->lock, flags); | |
148 | ||
149 | if (mix->type == MMP_CLK_MIX_TYPE_V1 | |
150 | || mix->type == MMP_CLK_MIX_TYPE_V2) | |
151 | mux_div = readl(ri->reg_clk_ctrl); | |
152 | else | |
153 | mux_div = readl(ri->reg_clk_sel); | |
154 | ||
155 | if (change_div) { | |
156 | width = ri->width_div; | |
157 | shift = ri->shift_div; | |
158 | mux_div &= ~MMP_CLK_BITS_MASK(width, shift); | |
159 | mux_div |= MMP_CLK_BITS_SET_VAL(div_val, width, shift); | |
160 | } | |
161 | ||
162 | if (change_mux) { | |
163 | width = ri->width_mux; | |
164 | shift = ri->shift_mux; | |
165 | mux_div &= ~MMP_CLK_BITS_MASK(width, shift); | |
166 | mux_div |= MMP_CLK_BITS_SET_VAL(mux_val, width, shift); | |
167 | } | |
168 | ||
169 | if (mix->type == MMP_CLK_MIX_TYPE_V1) { | |
170 | writel(mux_div, ri->reg_clk_ctrl); | |
171 | } else if (mix->type == MMP_CLK_MIX_TYPE_V2) { | |
172 | mux_div |= (1 << ri->bit_fc); | |
173 | writel(mux_div, ri->reg_clk_ctrl); | |
174 | ||
175 | do { | |
176 | fc_req = readl(ri->reg_clk_ctrl); | |
177 | timeout--; | |
178 | if (!(fc_req & (1 << ri->bit_fc))) | |
179 | break; | |
180 | } while (timeout); | |
181 | ||
182 | if (timeout == 0) { | |
183 | pr_err("%s:%s cannot do frequency change\n", | |
184 | __func__, __clk_get_name(mix->hw.clk)); | |
185 | ret = -EBUSY; | |
186 | goto error; | |
187 | } | |
188 | } else { | |
189 | fc_req = readl(ri->reg_clk_ctrl); | |
190 | fc_req |= 1 << ri->bit_fc; | |
191 | writel(fc_req, ri->reg_clk_ctrl); | |
192 | writel(mux_div, ri->reg_clk_sel); | |
193 | fc_req &= ~(1 << ri->bit_fc); | |
194 | } | |
195 | ||
196 | ret = 0; | |
197 | error: | |
198 | if (mix->lock) | |
199 | spin_unlock_irqrestore(mix->lock, flags); | |
200 | ||
201 | return ret; | |
202 | } | |
203 | ||
204 | static long mmp_clk_mix_determine_rate(struct clk_hw *hw, unsigned long rate, | |
205 | unsigned long *best_parent_rate, | |
646cafc6 | 206 | struct clk_hw **best_parent_clk) |
ee81f4ee CX |
207 | { |
208 | struct mmp_clk_mix *mix = to_clk_mix(hw); | |
209 | struct mmp_clk_mix_clk_table *item; | |
210 | struct clk *parent, *parent_best, *mix_clk; | |
211 | unsigned long parent_rate, mix_rate, mix_rate_best, parent_rate_best; | |
212 | unsigned long gap, gap_best; | |
213 | u32 div_val_max; | |
214 | unsigned int div; | |
215 | int i, j; | |
216 | ||
217 | mix_clk = hw->clk; | |
218 | ||
219 | parent = NULL; | |
220 | mix_rate_best = 0; | |
221 | parent_rate_best = 0; | |
222 | gap_best = rate; | |
223 | parent_best = NULL; | |
224 | ||
225 | if (mix->table) { | |
226 | for (i = 0; i < mix->table_size; i++) { | |
227 | item = &mix->table[i]; | |
228 | if (item->valid == 0) | |
229 | continue; | |
230 | parent = clk_get_parent_by_index(mix_clk, | |
231 | item->parent_index); | |
232 | parent_rate = __clk_get_rate(parent); | |
233 | mix_rate = parent_rate / item->divisor; | |
234 | gap = abs(mix_rate - rate); | |
235 | if (parent_best == NULL || gap < gap_best) { | |
236 | parent_best = parent; | |
237 | parent_rate_best = parent_rate; | |
238 | mix_rate_best = mix_rate; | |
239 | gap_best = gap; | |
240 | if (gap_best == 0) | |
241 | goto found; | |
242 | } | |
243 | } | |
244 | } else { | |
245 | for (i = 0; i < __clk_get_num_parents(mix_clk); i++) { | |
246 | parent = clk_get_parent_by_index(mix_clk, i); | |
247 | parent_rate = __clk_get_rate(parent); | |
248 | div_val_max = _get_maxdiv(mix); | |
249 | for (j = 0; j < div_val_max; j++) { | |
250 | div = _get_div(mix, j); | |
251 | mix_rate = parent_rate / div; | |
252 | gap = abs(mix_rate - rate); | |
253 | if (parent_best == NULL || gap < gap_best) { | |
254 | parent_best = parent; | |
255 | parent_rate_best = parent_rate; | |
256 | mix_rate_best = mix_rate; | |
257 | gap_best = gap; | |
258 | if (gap_best == 0) | |
259 | goto found; | |
260 | } | |
261 | } | |
262 | } | |
263 | } | |
264 | ||
265 | found: | |
266 | *best_parent_rate = parent_rate_best; | |
646cafc6 | 267 | *best_parent_clk = __clk_get_hw(parent_best); |
ee81f4ee CX |
268 | |
269 | return mix_rate_best; | |
270 | } | |
271 | ||
272 | static int mmp_clk_mix_set_rate_and_parent(struct clk_hw *hw, | |
273 | unsigned long rate, | |
274 | unsigned long parent_rate, | |
275 | u8 index) | |
276 | { | |
277 | struct mmp_clk_mix *mix = to_clk_mix(hw); | |
278 | unsigned int div; | |
279 | u32 div_val, mux_val; | |
280 | ||
281 | div = parent_rate / rate; | |
282 | div_val = _get_div_val(mix, div); | |
283 | mux_val = _get_mux_val(mix, index); | |
284 | ||
285 | return _set_rate(mix, mux_val, div_val, 1, 1); | |
286 | } | |
287 | ||
288 | static u8 mmp_clk_mix_get_parent(struct clk_hw *hw) | |
289 | { | |
290 | struct mmp_clk_mix *mix = to_clk_mix(hw); | |
291 | struct mmp_clk_mix_reg_info *ri = &mix->reg_info; | |
292 | unsigned long flags = 0; | |
293 | u32 mux_div = 0; | |
294 | u8 width, shift; | |
295 | u32 mux_val; | |
296 | ||
297 | if (mix->lock) | |
298 | spin_lock_irqsave(mix->lock, flags); | |
299 | ||
300 | if (mix->type == MMP_CLK_MIX_TYPE_V1 | |
301 | || mix->type == MMP_CLK_MIX_TYPE_V2) | |
302 | mux_div = readl(ri->reg_clk_ctrl); | |
303 | else | |
304 | mux_div = readl(ri->reg_clk_sel); | |
305 | ||
306 | if (mix->lock) | |
307 | spin_unlock_irqrestore(mix->lock, flags); | |
308 | ||
309 | width = mix->reg_info.width_mux; | |
310 | shift = mix->reg_info.shift_mux; | |
311 | ||
312 | mux_val = MMP_CLK_BITS_GET_VAL(mux_div, width, shift); | |
313 | ||
314 | return _get_mux(mix, mux_val); | |
315 | } | |
316 | ||
317 | static unsigned long mmp_clk_mix_recalc_rate(struct clk_hw *hw, | |
318 | unsigned long parent_rate) | |
319 | { | |
320 | struct mmp_clk_mix *mix = to_clk_mix(hw); | |
321 | struct mmp_clk_mix_reg_info *ri = &mix->reg_info; | |
322 | unsigned long flags = 0; | |
323 | u32 mux_div = 0; | |
324 | u8 width, shift; | |
325 | unsigned int div; | |
326 | ||
327 | if (mix->lock) | |
328 | spin_lock_irqsave(mix->lock, flags); | |
329 | ||
330 | if (mix->type == MMP_CLK_MIX_TYPE_V1 | |
331 | || mix->type == MMP_CLK_MIX_TYPE_V2) | |
332 | mux_div = readl(ri->reg_clk_ctrl); | |
333 | else | |
334 | mux_div = readl(ri->reg_clk_sel); | |
335 | ||
336 | if (mix->lock) | |
337 | spin_unlock_irqrestore(mix->lock, flags); | |
338 | ||
339 | width = mix->reg_info.width_div; | |
340 | shift = mix->reg_info.shift_div; | |
341 | ||
342 | div = _get_div(mix, MMP_CLK_BITS_GET_VAL(mux_div, width, shift)); | |
343 | ||
344 | return parent_rate / div; | |
345 | } | |
346 | ||
347 | static int mmp_clk_set_parent(struct clk_hw *hw, u8 index) | |
348 | { | |
349 | struct mmp_clk_mix *mix = to_clk_mix(hw); | |
350 | struct mmp_clk_mix_clk_table *item; | |
351 | int i; | |
352 | u32 div_val, mux_val; | |
353 | ||
354 | if (mix->table) { | |
355 | for (i = 0; i < mix->table_size; i++) { | |
356 | item = &mix->table[i]; | |
357 | if (item->valid == 0) | |
358 | continue; | |
359 | if (item->parent_index == index) | |
360 | break; | |
361 | } | |
362 | if (i < mix->table_size) { | |
363 | div_val = _get_div_val(mix, item->divisor); | |
364 | mux_val = _get_mux_val(mix, item->parent_index); | |
365 | } else | |
366 | return -EINVAL; | |
367 | } else { | |
368 | mux_val = _get_mux_val(mix, index); | |
369 | div_val = 0; | |
370 | } | |
371 | ||
372 | return _set_rate(mix, mux_val, div_val, 1, div_val ? 1 : 0); | |
373 | } | |
374 | ||
375 | static int mmp_clk_set_rate(struct clk_hw *hw, unsigned long rate, | |
376 | unsigned long best_parent_rate) | |
377 | { | |
378 | struct mmp_clk_mix *mix = to_clk_mix(hw); | |
379 | struct mmp_clk_mix_clk_table *item; | |
380 | unsigned long parent_rate; | |
381 | unsigned int best_divisor; | |
382 | struct clk *mix_clk, *parent; | |
383 | int i; | |
384 | ||
385 | best_divisor = best_parent_rate / rate; | |
386 | ||
387 | mix_clk = hw->clk; | |
388 | if (mix->table) { | |
389 | for (i = 0; i < mix->table_size; i++) { | |
390 | item = &mix->table[i]; | |
391 | if (item->valid == 0) | |
392 | continue; | |
393 | parent = clk_get_parent_by_index(mix_clk, | |
394 | item->parent_index); | |
395 | parent_rate = __clk_get_rate(parent); | |
396 | if (parent_rate == best_parent_rate | |
397 | && item->divisor == best_divisor) | |
398 | break; | |
399 | } | |
400 | if (i < mix->table_size) | |
401 | return _set_rate(mix, | |
402 | _get_mux_val(mix, item->parent_index), | |
403 | _get_div_val(mix, item->divisor), | |
404 | 1, 1); | |
405 | else | |
406 | return -EINVAL; | |
407 | } else { | |
408 | for (i = 0; i < __clk_get_num_parents(mix_clk); i++) { | |
409 | parent = clk_get_parent_by_index(mix_clk, i); | |
410 | parent_rate = __clk_get_rate(parent); | |
411 | if (parent_rate == best_parent_rate) | |
412 | break; | |
413 | } | |
414 | if (i < __clk_get_num_parents(mix_clk)) | |
415 | return _set_rate(mix, _get_mux_val(mix, i), | |
416 | _get_div_val(mix, best_divisor), 1, 1); | |
417 | else | |
418 | return -EINVAL; | |
419 | } | |
420 | } | |
421 | ||
422 | static void mmp_clk_mix_init(struct clk_hw *hw) | |
423 | { | |
424 | struct mmp_clk_mix *mix = to_clk_mix(hw); | |
425 | ||
426 | if (mix->table) | |
427 | _filter_clk_table(mix, mix->table, mix->table_size); | |
428 | } | |
429 | ||
430 | const struct clk_ops mmp_clk_mix_ops = { | |
431 | .determine_rate = mmp_clk_mix_determine_rate, | |
432 | .set_rate_and_parent = mmp_clk_mix_set_rate_and_parent, | |
433 | .set_rate = mmp_clk_set_rate, | |
434 | .set_parent = mmp_clk_set_parent, | |
435 | .get_parent = mmp_clk_mix_get_parent, | |
436 | .recalc_rate = mmp_clk_mix_recalc_rate, | |
437 | .init = mmp_clk_mix_init, | |
438 | }; | |
439 | ||
440 | struct clk *mmp_clk_register_mix(struct device *dev, | |
441 | const char *name, | |
442 | const char **parent_names, | |
443 | u8 num_parents, | |
444 | unsigned long flags, | |
445 | struct mmp_clk_mix_config *config, | |
446 | spinlock_t *lock) | |
447 | { | |
448 | struct mmp_clk_mix *mix; | |
449 | struct clk *clk; | |
450 | struct clk_init_data init; | |
451 | size_t table_bytes; | |
452 | ||
453 | mix = kzalloc(sizeof(*mix), GFP_KERNEL); | |
454 | if (!mix) { | |
455 | pr_err("%s:%s: could not allocate mmp mix clk\n", | |
456 | __func__, name); | |
457 | return ERR_PTR(-ENOMEM); | |
458 | } | |
459 | ||
460 | init.name = name; | |
461 | init.flags = flags | CLK_GET_RATE_NOCACHE; | |
462 | init.parent_names = parent_names; | |
463 | init.num_parents = num_parents; | |
464 | init.ops = &mmp_clk_mix_ops; | |
465 | ||
466 | memcpy(&mix->reg_info, &config->reg_info, sizeof(config->reg_info)); | |
467 | if (config->table) { | |
468 | table_bytes = sizeof(*config->table) * config->table_size; | |
469 | mix->table = kzalloc(table_bytes, GFP_KERNEL); | |
470 | if (!mix->table) { | |
471 | pr_err("%s:%s: could not allocate mmp mix table\n", | |
472 | __func__, name); | |
473 | kfree(mix); | |
474 | return ERR_PTR(-ENOMEM); | |
475 | } | |
476 | memcpy(mix->table, config->table, table_bytes); | |
477 | mix->table_size = config->table_size; | |
478 | } | |
479 | ||
480 | if (config->mux_table) { | |
481 | table_bytes = sizeof(u32) * num_parents; | |
482 | mix->mux_table = kzalloc(table_bytes, GFP_KERNEL); | |
483 | if (!mix->mux_table) { | |
484 | pr_err("%s:%s: could not allocate mmp mix mux-table\n", | |
485 | __func__, name); | |
486 | kfree(mix->table); | |
487 | kfree(mix); | |
488 | return ERR_PTR(-ENOMEM); | |
489 | } | |
490 | memcpy(mix->mux_table, config->mux_table, table_bytes); | |
491 | } | |
492 | ||
493 | mix->div_flags = config->div_flags; | |
494 | mix->mux_flags = config->mux_flags; | |
495 | mix->lock = lock; | |
496 | mix->hw.init = &init; | |
497 | ||
498 | if (config->reg_info.bit_fc >= 32) | |
499 | mix->type = MMP_CLK_MIX_TYPE_V1; | |
500 | else if (config->reg_info.reg_clk_sel) | |
501 | mix->type = MMP_CLK_MIX_TYPE_V3; | |
502 | else | |
503 | mix->type = MMP_CLK_MIX_TYPE_V2; | |
504 | clk = clk_register(dev, &mix->hw); | |
505 | ||
506 | if (IS_ERR(clk)) { | |
507 | kfree(mix->mux_table); | |
508 | kfree(mix->table); | |
509 | kfree(mix); | |
510 | } | |
511 | ||
512 | return clk; | |
513 | } |