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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / clk / qcom / clk-rcg2.c
bloba071bba8018c40424d4d7f02ea80c9622c4d1b26
1 /*
2 * Copyright (c) 2013, 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/kernel.h>
15 #include <linux/bitops.h>
16 #include <linux/err.h>
17 #include <linux/bug.h>
18 #include <linux/export.h>
19 #include <linux/clk-provider.h>
20 #include <linux/delay.h>
21 #include <linux/regmap.h>
22 #include <linux/math64.h>
23
24 #include <asm/div64.h>
25
26 #include "clk-rcg.h"
27 #include "common.h"
28
29 #define CMD_REG 0x0
30 #define CMD_UPDATE BIT(0)
31 #define CMD_ROOT_EN BIT(1)
32 #define CMD_DIRTY_CFG BIT(4)
33 #define CMD_DIRTY_N BIT(5)
34 #define CMD_DIRTY_M BIT(6)
35 #define CMD_DIRTY_D BIT(7)
36 #define CMD_ROOT_OFF BIT(31)
37
38 #define CFG_REG 0x4
39 #define CFG_SRC_DIV_SHIFT 0
40 #define CFG_SRC_SEL_SHIFT 8
41 #define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT)
42 #define CFG_MODE_SHIFT 12
43 #define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT)
44 #define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT)
45
46 #define M_REG 0x8
47 #define N_REG 0xc
48 #define D_REG 0x10
49
50 static int clk_rcg2_is_enabled(struct clk_hw *hw)
51 {
52 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
53 u32 cmd;
54 int ret;
55
56 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
57 if (ret)
58 return ret;
59
60 return (cmd & CMD_ROOT_OFF) == 0;
61 }
62
63 static u8 clk_rcg2_get_parent(struct clk_hw *hw)
64 {
65 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
66 int num_parents = clk_hw_get_num_parents(hw);
67 u32 cfg;
68 int i, ret;
69
70 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
71 if (ret)
72 goto err;
73
74 cfg &= CFG_SRC_SEL_MASK;
75 cfg >>= CFG_SRC_SEL_SHIFT;
76
77 for (i = 0; i < num_parents; i++)
78 if (cfg == rcg->parent_map[i].cfg)
79 return i;
80
81 err:
82 pr_debug("%s: Clock %s has invalid parent, using default.\n",
83 __func__, clk_hw_get_name(hw));
84 return 0;
85 }
86
87 static int update_config(struct clk_rcg2 *rcg)
88 {
89 int count, ret;
90 u32 cmd;
91 struct clk_hw *hw = &rcg->clkr.hw;
92 const char *name = clk_hw_get_name(hw);
93
94 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
95 CMD_UPDATE, CMD_UPDATE);
96 if (ret)
97 return ret;
98
99 /* Wait for update to take effect */
100 for (count = 500; count > 0; count--) {
101 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
102 if (ret)
103 return ret;
104 if (!(cmd & CMD_UPDATE))
105 return 0;
106 udelay(1);
107 }
108
109 WARN(1, "%s: rcg didn't update its configuration.", name);
110 return 0;
111 }
112
113 static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
114 {
115 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
116 int ret;
117 u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
118
119 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
120 CFG_SRC_SEL_MASK, cfg);
121 if (ret)
122 return ret;
123
124 return update_config(rcg);
125 }
126
127 /*
128 * Calculate m/n:d rate
129 *
130 * parent_rate m
131 * rate = ----------- x ---
132 * hid_div n
133 */
134 static unsigned long
135 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
136 {
137 if (hid_div) {
138 rate *= 2;
139 rate /= hid_div + 1;
140 }
141
142 if (mode) {
143 u64 tmp = rate;
144 tmp *= m;
145 do_div(tmp, n);
146 rate = tmp;
147 }
148
149 return rate;
150 }
151
152 static unsigned long
153 clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
154 {
155 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
156 u32 cfg, hid_div, m = 0, n = 0, mode = 0, mask;
157
158 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
159
160 if (rcg->mnd_width) {
161 mask = BIT(rcg->mnd_width) - 1;
162 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m);
163 m &= mask;
164 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &n);
165 n = ~n;
166 n &= mask;
167 n += m;
168 mode = cfg & CFG_MODE_MASK;
169 mode >>= CFG_MODE_SHIFT;
170 }
171
172 mask = BIT(rcg->hid_width) - 1;
173 hid_div = cfg >> CFG_SRC_DIV_SHIFT;
174 hid_div &= mask;
175
176 return calc_rate(parent_rate, m, n, mode, hid_div);
177 }
178
179 static int _freq_tbl_determine_rate(struct clk_hw *hw,
180 const struct freq_tbl *f, struct clk_rate_request *req)
181 {
182 unsigned long clk_flags, rate = req->rate;
183 struct clk_hw *p;
184 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
185 int index;
186
187 f = qcom_find_freq(f, rate);
188 if (!f)
189 return -EINVAL;
190
191 index = qcom_find_src_index(hw, rcg->parent_map, f->src);
192 if (index < 0)
193 return index;
194
195 clk_flags = clk_hw_get_flags(hw);
196 p = clk_hw_get_parent_by_index(hw, index);
197 if (clk_flags & CLK_SET_RATE_PARENT) {
198 if (f->pre_div) {
199 rate /= 2;
200 rate *= f->pre_div + 1;
201 }
202
203 if (f->n) {
204 u64 tmp = rate;
205 tmp = tmp * f->n;
206 do_div(tmp, f->m);
207 rate = tmp;
208 }
209 } else {
210 rate = clk_hw_get_rate(p);
211 }
212 req->best_parent_hw = p;
213 req->best_parent_rate = rate;
214 req->rate = f->freq;
215
216 return 0;
217 }
218
219 static int clk_rcg2_determine_rate(struct clk_hw *hw,
220 struct clk_rate_request *req)
221 {
222 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
223
224 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req);
225 }
226
227 static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
228 {
229 u32 cfg, mask;
230 struct clk_hw *hw = &rcg->clkr.hw;
231 int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
232
233 if (index < 0)
234 return index;
235
236 if (rcg->mnd_width && f->n) {
237 mask = BIT(rcg->mnd_width) - 1;
238 ret = regmap_update_bits(rcg->clkr.regmap,
239 rcg->cmd_rcgr + M_REG, mask, f->m);
240 if (ret)
241 return ret;
242
243 ret = regmap_update_bits(rcg->clkr.regmap,
244 rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m));
245 if (ret)
246 return ret;
247
248 ret = regmap_update_bits(rcg->clkr.regmap,
249 rcg->cmd_rcgr + D_REG, mask, ~f->n);
250 if (ret)
251 return ret;
252 }
253
254 mask = BIT(rcg->hid_width) - 1;
255 mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK;
256 cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
257 cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
258 if (rcg->mnd_width && f->n && (f->m != f->n))
259 cfg |= CFG_MODE_DUAL_EDGE;
260 ret = regmap_update_bits(rcg->clkr.regmap,
261 rcg->cmd_rcgr + CFG_REG, mask, cfg);
262 if (ret)
263 return ret;
264
265 return update_config(rcg);
266 }
267
268 static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate)
269 {
270 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
271 const struct freq_tbl *f;
272
273 f = qcom_find_freq(rcg->freq_tbl, rate);
274 if (!f)
275 return -EINVAL;
276
277 return clk_rcg2_configure(rcg, f);
278 }
279
280 static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
281 unsigned long parent_rate)
282 {
283 return __clk_rcg2_set_rate(hw, rate);
284 }
285
286 static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
287 unsigned long rate, unsigned long parent_rate, u8 index)
288 {
289 return __clk_rcg2_set_rate(hw, rate);
290 }
291
292 const struct clk_ops clk_rcg2_ops = {
293 .is_enabled = clk_rcg2_is_enabled,
294 .get_parent = clk_rcg2_get_parent,
295 .set_parent = clk_rcg2_set_parent,
296 .recalc_rate = clk_rcg2_recalc_rate,
297 .determine_rate = clk_rcg2_determine_rate,
298 .set_rate = clk_rcg2_set_rate,
299 .set_rate_and_parent = clk_rcg2_set_rate_and_parent,
300 };
301 EXPORT_SYMBOL_GPL(clk_rcg2_ops);
302
303 static int clk_rcg2_shared_force_enable(struct clk_hw *hw, unsigned long rate)
304 {
305 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
306 const char *name = clk_hw_get_name(hw);
307 int ret, count;
308
309 /* force enable RCG */
310 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
311 CMD_ROOT_EN, CMD_ROOT_EN);
312 if (ret)
313 return ret;
314
315 /* wait for RCG to turn ON */
316 for (count = 500; count > 0; count--) {
317 ret = clk_rcg2_is_enabled(hw);
318 if (ret)
319 break;
320 udelay(1);
321 }
322 if (!count)
323 pr_err("%s: RCG did not turn on\n", name);
324
325 /* set clock rate */
326 ret = __clk_rcg2_set_rate(hw, rate);
327 if (ret)
328 return ret;
329
330 /* clear force enable RCG */
331 return regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
332 CMD_ROOT_EN, 0);
333 }
334
335 static int clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
336 unsigned long parent_rate)
337 {
338 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
339
340 /* cache the rate */
341 rcg->current_freq = rate;
342
343 if (!__clk_is_enabled(hw->clk))
344 return 0;
345
346 return clk_rcg2_shared_force_enable(hw, rcg->current_freq);
347 }
348
349 static unsigned long
350 clk_rcg2_shared_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
351 {
352 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
353
354 return rcg->current_freq = clk_rcg2_recalc_rate(hw, parent_rate);
355 }
356
357 static int clk_rcg2_shared_enable(struct clk_hw *hw)
358 {
359 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
360
361 return clk_rcg2_shared_force_enable(hw, rcg->current_freq);
362 }
363
364 static void clk_rcg2_shared_disable(struct clk_hw *hw)
365 {
366 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
367
368 /* switch to XO, which is the lowest entry in the freq table */
369 clk_rcg2_shared_set_rate(hw, rcg->freq_tbl[0].freq, 0);
370 }
371
372 const struct clk_ops clk_rcg2_shared_ops = {
373 .enable = clk_rcg2_shared_enable,
374 .disable = clk_rcg2_shared_disable,
375 .get_parent = clk_rcg2_get_parent,
376 .recalc_rate = clk_rcg2_shared_recalc_rate,
377 .determine_rate = clk_rcg2_determine_rate,
378 .set_rate = clk_rcg2_shared_set_rate,
379 };
380 EXPORT_SYMBOL_GPL(clk_rcg2_shared_ops);
381
382 struct frac_entry {
383 int num;
384 int den;
385 };
386
387 static const struct frac_entry frac_table_675m[] = { /* link rate of 270M */
388 { 52, 295 }, /* 119 M */
389 { 11, 57 }, /* 130.25 M */
390 { 63, 307 }, /* 138.50 M */
391 { 11, 50 }, /* 148.50 M */
392 { 47, 206 }, /* 154 M */
393 { 31, 100 }, /* 205.25 M */
394 { 107, 269 }, /* 268.50 M */
395 { },
396 };
397
398 static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */
399 { 31, 211 }, /* 119 M */
400 { 32, 199 }, /* 130.25 M */
401 { 63, 307 }, /* 138.50 M */
402 { 11, 60 }, /* 148.50 M */
403 { 50, 263 }, /* 154 M */
404 { 31, 120 }, /* 205.25 M */
405 { 119, 359 }, /* 268.50 M */
406 { },
407 };
408
409 static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
410 unsigned long parent_rate)
411 {
412 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
413 struct freq_tbl f = *rcg->freq_tbl;
414 const struct frac_entry *frac;
415 int delta = 100000;
416 s64 src_rate = parent_rate;
417 s64 request;
418 u32 mask = BIT(rcg->hid_width) - 1;
419 u32 hid_div;
420
421 if (src_rate == 810000000)
422 frac = frac_table_810m;
423 else
424 frac = frac_table_675m;
425
426 for (; frac->num; frac++) {
427 request = rate;
428 request *= frac->den;
429 request = div_s64(request, frac->num);
430 if ((src_rate < (request - delta)) ||
431 (src_rate > (request + delta)))
432 continue;
433
434 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
435 &hid_div);
436 f.pre_div = hid_div;
437 f.pre_div >>= CFG_SRC_DIV_SHIFT;
438 f.pre_div &= mask;
439 f.m = frac->num;
440 f.n = frac->den;
441
442 return clk_rcg2_configure(rcg, &f);
443 }
444
445 return -EINVAL;
446 }
447
448 static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw,
449 unsigned long rate, unsigned long parent_rate, u8 index)
450 {
451 /* Parent index is set statically in frequency table */
452 return clk_edp_pixel_set_rate(hw, rate, parent_rate);
453 }
454
455 static int clk_edp_pixel_determine_rate(struct clk_hw *hw,
456 struct clk_rate_request *req)
457 {
458 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
459 const struct freq_tbl *f = rcg->freq_tbl;
460 const struct frac_entry *frac;
461 int delta = 100000;
462 s64 request;
463 u32 mask = BIT(rcg->hid_width) - 1;
464 u32 hid_div;
465 int index = qcom_find_src_index(hw, rcg->parent_map, f->src);
466
467 /* Force the correct parent */
468 req->best_parent_hw = clk_hw_get_parent_by_index(hw, index);
469 req->best_parent_rate = clk_hw_get_rate(req->best_parent_hw);
470
471 if (req->best_parent_rate == 810000000)
472 frac = frac_table_810m;
473 else
474 frac = frac_table_675m;
475
476 for (; frac->num; frac++) {
477 request = req->rate;
478 request *= frac->den;
479 request = div_s64(request, frac->num);
480 if ((req->best_parent_rate < (request - delta)) ||
481 (req->best_parent_rate > (request + delta)))
482 continue;
483
484 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
485 &hid_div);
486 hid_div >>= CFG_SRC_DIV_SHIFT;
487 hid_div &= mask;
488
489 req->rate = calc_rate(req->best_parent_rate,
490 frac->num, frac->den,
491 !!frac->den, hid_div);
492 return 0;
493 }
494
495 return -EINVAL;
496 }
497
498 const struct clk_ops clk_edp_pixel_ops = {
499 .is_enabled = clk_rcg2_is_enabled,
500 .get_parent = clk_rcg2_get_parent,
501 .set_parent = clk_rcg2_set_parent,
502 .recalc_rate = clk_rcg2_recalc_rate,
503 .set_rate = clk_edp_pixel_set_rate,
504 .set_rate_and_parent = clk_edp_pixel_set_rate_and_parent,
505 .determine_rate = clk_edp_pixel_determine_rate,
506 };
507 EXPORT_SYMBOL_GPL(clk_edp_pixel_ops);
508
509 static int clk_byte_determine_rate(struct clk_hw *hw,
510 struct clk_rate_request *req)
511 {
512 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
513 const struct freq_tbl *f = rcg->freq_tbl;
514 int index = qcom_find_src_index(hw, rcg->parent_map, f->src);
515 unsigned long parent_rate, div;
516 u32 mask = BIT(rcg->hid_width) - 1;
517 struct clk_hw *p;
518
519 if (req->rate == 0)
520 return -EINVAL;
521
522 req->best_parent_hw = p = clk_hw_get_parent_by_index(hw, index);
523 req->best_parent_rate = parent_rate = clk_hw_round_rate(p, req->rate);
524
525 div = DIV_ROUND_UP((2 * parent_rate), req->rate) - 1;
526 div = min_t(u32, div, mask);
527
528 req->rate = calc_rate(parent_rate, 0, 0, 0, div);
529
530 return 0;
531 }
532
533 static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate,
534 unsigned long parent_rate)
535 {
536 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
537 struct freq_tbl f = *rcg->freq_tbl;
538 unsigned long div;
539 u32 mask = BIT(rcg->hid_width) - 1;
540
541 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
542 div = min_t(u32, div, mask);
543
544 f.pre_div = div;
545
546 return clk_rcg2_configure(rcg, &f);
547 }
548
549 static int clk_byte_set_rate_and_parent(struct clk_hw *hw,
550 unsigned long rate, unsigned long parent_rate, u8 index)
551 {
552 /* Parent index is set statically in frequency table */
553 return clk_byte_set_rate(hw, rate, parent_rate);
554 }
555
556 const struct clk_ops clk_byte_ops = {
557 .is_enabled = clk_rcg2_is_enabled,
558 .get_parent = clk_rcg2_get_parent,
559 .set_parent = clk_rcg2_set_parent,
560 .recalc_rate = clk_rcg2_recalc_rate,
561 .set_rate = clk_byte_set_rate,
562 .set_rate_and_parent = clk_byte_set_rate_and_parent,
563 .determine_rate = clk_byte_determine_rate,
564 };
565 EXPORT_SYMBOL_GPL(clk_byte_ops);
566
567 static int clk_byte2_determine_rate(struct clk_hw *hw,
568 struct clk_rate_request *req)
569 {
570 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
571 unsigned long parent_rate, div;
572 u32 mask = BIT(rcg->hid_width) - 1;
573 struct clk_hw *p;
574 unsigned long rate = req->rate;
575
576 if (rate == 0)
577 return -EINVAL;
578
579 p = req->best_parent_hw;
580 req->best_parent_rate = parent_rate = clk_hw_round_rate(p, rate);
581
582 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
583 div = min_t(u32, div, mask);
584
585 req->rate = calc_rate(parent_rate, 0, 0, 0, div);
586
587 return 0;
588 }
589
590 static int clk_byte2_set_rate(struct clk_hw *hw, unsigned long rate,
591 unsigned long parent_rate)
592 {
593 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
594 struct freq_tbl f = { 0 };
595 unsigned long div;
596 int i, num_parents = clk_hw_get_num_parents(hw);
597 u32 mask = BIT(rcg->hid_width) - 1;
598 u32 cfg;
599
600 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
601 div = min_t(u32, div, mask);
602
603 f.pre_div = div;
604
605 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
606 cfg &= CFG_SRC_SEL_MASK;
607 cfg >>= CFG_SRC_SEL_SHIFT;
608
609 for (i = 0; i < num_parents; i++) {
610 if (cfg == rcg->parent_map[i].cfg) {
611 f.src = rcg->parent_map[i].src;
612 return clk_rcg2_configure(rcg, &f);
613 }
614 }
615
616 return -EINVAL;
617 }
618
619 static int clk_byte2_set_rate_and_parent(struct clk_hw *hw,
620 unsigned long rate, unsigned long parent_rate, u8 index)
621 {
622 /* Read the hardware to determine parent during set_rate */
623 return clk_byte2_set_rate(hw, rate, parent_rate);
624 }
625
626 const struct clk_ops clk_byte2_ops = {
627 .is_enabled = clk_rcg2_is_enabled,
628 .get_parent = clk_rcg2_get_parent,
629 .set_parent = clk_rcg2_set_parent,
630 .recalc_rate = clk_rcg2_recalc_rate,
631 .set_rate = clk_byte2_set_rate,
632 .set_rate_and_parent = clk_byte2_set_rate_and_parent,
633 .determine_rate = clk_byte2_determine_rate,
634 };
635 EXPORT_SYMBOL_GPL(clk_byte2_ops);
636
637 static const struct frac_entry frac_table_pixel[] = {
638 { 3, 8 },
639 { 2, 9 },
640 { 4, 9 },
641 { 1, 1 },
642 { }
643 };
644
645 static int clk_pixel_determine_rate(struct clk_hw *hw,
646 struct clk_rate_request *req)
647 {
648 unsigned long request, src_rate;
649 int delta = 100000;
650 const struct frac_entry *frac = frac_table_pixel;
651
652 for (; frac->num; frac++) {
653 request = (req->rate * frac->den) / frac->num;
654
655 src_rate = clk_hw_round_rate(req->best_parent_hw, request);
656 if ((src_rate < (request - delta)) ||
657 (src_rate > (request + delta)))
658 continue;
659
660 req->best_parent_rate = src_rate;
661 req->rate = (src_rate * frac->num) / frac->den;
662 return 0;
663 }
664
665 return -EINVAL;
666 }
667
668 static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
669 unsigned long parent_rate)
670 {
671 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
672 struct freq_tbl f = { 0 };
673 const struct frac_entry *frac = frac_table_pixel;
674 unsigned long request;
675 int delta = 100000;
676 u32 mask = BIT(rcg->hid_width) - 1;
677 u32 hid_div, cfg;
678 int i, num_parents = clk_hw_get_num_parents(hw);
679
680 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
681 cfg &= CFG_SRC_SEL_MASK;
682 cfg >>= CFG_SRC_SEL_SHIFT;
683
684 for (i = 0; i < num_parents; i++)
685 if (cfg == rcg->parent_map[i].cfg) {
686 f.src = rcg->parent_map[i].src;
687 break;
688 }
689
690 for (; frac->num; frac++) {
691 request = (rate * frac->den) / frac->num;
692
693 if ((parent_rate < (request - delta)) ||
694 (parent_rate > (request + delta)))
695 continue;
696
697 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
698 &hid_div);
699 f.pre_div = hid_div;
700 f.pre_div >>= CFG_SRC_DIV_SHIFT;
701 f.pre_div &= mask;
702 f.m = frac->num;
703 f.n = frac->den;
704
705 return clk_rcg2_configure(rcg, &f);
706 }
707 return -EINVAL;
708 }
709
710 static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
711 unsigned long parent_rate, u8 index)
712 {
713 return clk_pixel_set_rate(hw, rate, parent_rate);
714 }
715
716 const struct clk_ops clk_pixel_ops = {
717 .is_enabled = clk_rcg2_is_enabled,
718 .get_parent = clk_rcg2_get_parent,
719 .set_parent = clk_rcg2_set_parent,
720 .recalc_rate = clk_rcg2_recalc_rate,
721 .set_rate = clk_pixel_set_rate,
722 .set_rate_and_parent = clk_pixel_set_rate_and_parent,
723 .determine_rate = clk_pixel_determine_rate,
724 };
725 EXPORT_SYMBOL_GPL(clk_pixel_ops);
726
727 static int clk_gfx3d_determine_rate(struct clk_hw *hw,
728 struct clk_rate_request *req)
729 {
730 struct clk_rate_request parent_req = { };
731 struct clk_hw *p2, *p8, *p9, *xo;
732 unsigned long p9_rate;
733 int ret;
734
735 xo = clk_hw_get_parent_by_index(hw, 0);
736 if (req->rate == clk_hw_get_rate(xo)) {
737 req->best_parent_hw = xo;
738 return 0;
739 }
740
741 p9 = clk_hw_get_parent_by_index(hw, 2);
742 p2 = clk_hw_get_parent_by_index(hw, 3);
743 p8 = clk_hw_get_parent_by_index(hw, 4);
744
745 /* PLL9 is a fixed rate PLL */
746 p9_rate = clk_hw_get_rate(p9);
747
748 parent_req.rate = req->rate = min(req->rate, p9_rate);
749 if (req->rate == p9_rate) {
750 req->rate = req->best_parent_rate = p9_rate;
751 req->best_parent_hw = p9;
752 return 0;
753 }
754
755 if (req->best_parent_hw == p9) {
756 /* Are we going back to a previously used rate? */
757 if (clk_hw_get_rate(p8) == req->rate)
758 req->best_parent_hw = p8;
759 else
760 req->best_parent_hw = p2;
761 } else if (req->best_parent_hw == p8) {
762 req->best_parent_hw = p2;
763 } else {
764 req->best_parent_hw = p8;
765 }
766
767 ret = __clk_determine_rate(req->best_parent_hw, &parent_req);
768 if (ret)
769 return ret;
770
771 req->rate = req->best_parent_rate = parent_req.rate;
772
773 return 0;
774 }
775
776 static int clk_gfx3d_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
777 unsigned long parent_rate, u8 index)
778 {
779 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
780 u32 cfg;
781 int ret;
782
783 /* Just mux it, we don't use the division or m/n hardware */
784 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
785 ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, cfg);
786 if (ret)
787 return ret;
788
789 return update_config(rcg);
790 }
791
792 static int clk_gfx3d_set_rate(struct clk_hw *hw, unsigned long rate,
793 unsigned long parent_rate)
794 {
795 /*
796 * We should never get here; clk_gfx3d_determine_rate() should always
797 * make us use a different parent than what we're currently using, so
798 * clk_gfx3d_set_rate_and_parent() should always be called.
799 */
800 return 0;
801 }
802
803 const struct clk_ops clk_gfx3d_ops = {
804 .is_enabled = clk_rcg2_is_enabled,
805 .get_parent = clk_rcg2_get_parent,
806 .set_parent = clk_rcg2_set_parent,
807 .recalc_rate = clk_rcg2_recalc_rate,
808 .set_rate = clk_gfx3d_set_rate,
809 .set_rate_and_parent = clk_gfx3d_set_rate_and_parent,
810 .determine_rate = clk_gfx3d_determine_rate,
811 };
812 EXPORT_SYMBOL_GPL(clk_gfx3d_ops);
Linux with added FPC-III support