1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2013, 2018, The Linux Foundation. All rights reserved.
6 #include <linux/kernel.h>
7 #include <linux/bitops.h>
10 #include <linux/export.h>
11 #include <linux/clk-provider.h>
12 #include <linux/delay.h>
13 #include <linux/rational.h>
14 #include <linux/regmap.h>
15 #include <linux/math64.h>
16 #include <linux/slab.h>
18 #include <asm/div64.h>
24 #define CMD_UPDATE BIT(0)
25 #define CMD_ROOT_EN BIT(1)
26 #define CMD_DIRTY_CFG BIT(4)
27 #define CMD_DIRTY_N BIT(5)
28 #define CMD_DIRTY_M BIT(6)
29 #define CMD_DIRTY_D BIT(7)
30 #define CMD_ROOT_OFF BIT(31)
33 #define CFG_SRC_DIV_SHIFT 0
34 #define CFG_SRC_SEL_SHIFT 8
35 #define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT)
36 #define CFG_MODE_SHIFT 12
37 #define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT)
38 #define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT)
39 #define CFG_HW_CLK_CTRL_MASK BIT(20)
45 #define RCG_CFG_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + CFG_REG)
46 #define RCG_M_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + M_REG)
47 #define RCG_N_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + N_REG)
48 #define RCG_D_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + D_REG)
50 /* Dynamic Frequency Scaling */
51 #define MAX_PERF_LEVEL 8
52 #define SE_CMD_DFSR_OFFSET 0x14
53 #define SE_CMD_DFS_EN BIT(0)
54 #define SE_PERF_DFSR(level) (0x1c + 0x4 * (level))
55 #define SE_PERF_M_DFSR(level) (0x5c + 0x4 * (level))
56 #define SE_PERF_N_DFSR(level) (0x9c + 0x4 * (level))
63 static int clk_rcg2_is_enabled(struct clk_hw *hw)
65 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
69 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
73 return (cmd & CMD_ROOT_OFF) == 0;
76 static u8 __clk_rcg2_get_parent(struct clk_hw *hw, u32 cfg)
78 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
79 int num_parents = clk_hw_get_num_parents(hw);
82 cfg &= CFG_SRC_SEL_MASK;
83 cfg >>= CFG_SRC_SEL_SHIFT;
85 for (i = 0; i < num_parents; i++)
86 if (cfg == rcg->parent_map[i].cfg)
89 pr_debug("%s: Clock %s has invalid parent, using default.\n",
90 __func__, clk_hw_get_name(hw));
94 static u8 clk_rcg2_get_parent(struct clk_hw *hw)
96 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
100 ret = regmap_read(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), &cfg);
102 pr_debug("%s: Unable to read CFG register for %s\n",
103 __func__, clk_hw_get_name(hw));
107 return __clk_rcg2_get_parent(hw, cfg);
110 static int update_config(struct clk_rcg2 *rcg)
114 struct clk_hw *hw = &rcg->clkr.hw;
115 const char *name = clk_hw_get_name(hw);
117 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
118 CMD_UPDATE, CMD_UPDATE);
122 /* Wait for update to take effect */
123 for (count = 500; count > 0; count--) {
124 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
127 if (!(cmd & CMD_UPDATE))
132 WARN(1, "%s: rcg didn't update its configuration.", name);
136 static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
138 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
140 u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
142 ret = regmap_update_bits(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg),
143 CFG_SRC_SEL_MASK, cfg);
147 return update_config(rcg);
151 * Calculate m/n:d rate
154 * rate = ----------- x ---
158 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
176 __clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate, u32 cfg)
178 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
179 u32 hid_div, m = 0, n = 0, mode = 0, mask;
181 if (rcg->mnd_width) {
182 mask = BIT(rcg->mnd_width) - 1;
183 regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m);
185 regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), &n);
189 mode = cfg & CFG_MODE_MASK;
190 mode >>= CFG_MODE_SHIFT;
193 mask = BIT(rcg->hid_width) - 1;
194 hid_div = cfg >> CFG_SRC_DIV_SHIFT;
197 return calc_rate(parent_rate, m, n, mode, hid_div);
201 clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
203 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
206 regmap_read(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), &cfg);
208 return __clk_rcg2_recalc_rate(hw, parent_rate, cfg);
211 static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f,
212 struct clk_rate_request *req,
213 enum freq_policy policy)
215 unsigned long clk_flags, rate = req->rate;
217 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
222 f = qcom_find_freq_floor(f, rate);
225 f = qcom_find_freq(f, rate);
234 index = qcom_find_src_index(hw, rcg->parent_map, f->src);
238 clk_flags = clk_hw_get_flags(hw);
239 p = clk_hw_get_parent_by_index(hw, index);
243 if (clk_flags & CLK_SET_RATE_PARENT) {
249 rate *= f->pre_div + 1;
259 rate = clk_hw_get_rate(p);
261 req->best_parent_hw = p;
262 req->best_parent_rate = rate;
268 static int clk_rcg2_determine_rate(struct clk_hw *hw,
269 struct clk_rate_request *req)
271 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
273 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req, CEIL);
276 static int clk_rcg2_determine_floor_rate(struct clk_hw *hw,
277 struct clk_rate_request *req)
279 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
281 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req, FLOOR);
284 static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f,
287 u32 cfg, mask, d_val, not2d_val, n_minus_m;
288 struct clk_hw *hw = &rcg->clkr.hw;
289 int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src);
294 if (rcg->mnd_width && f->n) {
295 mask = BIT(rcg->mnd_width) - 1;
296 ret = regmap_update_bits(rcg->clkr.regmap,
297 RCG_M_OFFSET(rcg), mask, f->m);
301 ret = regmap_update_bits(rcg->clkr.regmap,
302 RCG_N_OFFSET(rcg), mask, ~(f->n - f->m));
306 /* Calculate 2d value */
309 n_minus_m = f->n - f->m;
312 d_val = clamp_t(u32, d_val, f->m, n_minus_m);
313 not2d_val = ~d_val & mask;
315 ret = regmap_update_bits(rcg->clkr.regmap,
316 RCG_D_OFFSET(rcg), mask, not2d_val);
321 mask = BIT(rcg->hid_width) - 1;
322 mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK | CFG_HW_CLK_CTRL_MASK;
323 cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
324 cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
325 if (rcg->mnd_width && f->n && (f->m != f->n))
326 cfg |= CFG_MODE_DUAL_EDGE;
334 static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
339 ret = regmap_read(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), &cfg);
343 ret = __clk_rcg2_configure(rcg, f, &cfg);
347 ret = regmap_write(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), cfg);
351 return update_config(rcg);
354 static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
355 enum freq_policy policy)
357 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
358 const struct freq_tbl *f;
362 f = qcom_find_freq_floor(rcg->freq_tbl, rate);
365 f = qcom_find_freq(rcg->freq_tbl, rate);
374 return clk_rcg2_configure(rcg, f);
377 static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
378 unsigned long parent_rate)
380 return __clk_rcg2_set_rate(hw, rate, CEIL);
383 static int clk_rcg2_set_floor_rate(struct clk_hw *hw, unsigned long rate,
384 unsigned long parent_rate)
386 return __clk_rcg2_set_rate(hw, rate, FLOOR);
389 static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
390 unsigned long rate, unsigned long parent_rate, u8 index)
392 return __clk_rcg2_set_rate(hw, rate, CEIL);
395 static int clk_rcg2_set_floor_rate_and_parent(struct clk_hw *hw,
396 unsigned long rate, unsigned long parent_rate, u8 index)
398 return __clk_rcg2_set_rate(hw, rate, FLOOR);
401 static int clk_rcg2_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
403 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
404 u32 notn_m, n, m, d, not2d, mask;
406 if (!rcg->mnd_width) {
407 /* 50 % duty-cycle for Non-MND RCGs */
413 regmap_read(rcg->clkr.regmap, RCG_D_OFFSET(rcg), ¬2d);
414 regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m);
415 regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m);
417 if (!not2d && !m && !notn_m) {
418 /* 50 % duty-cycle always */
424 mask = BIT(rcg->mnd_width) - 1;
427 d = DIV_ROUND_CLOSEST(d, 2);
429 n = (~(notn_m) + m) & mask;
437 static int clk_rcg2_set_duty_cycle(struct clk_hw *hw, struct clk_duty *duty)
439 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
440 u32 notn_m, n, m, d, not2d, mask, duty_per;
443 /* Duty-cycle cannot be modified for non-MND RCGs */
447 mask = BIT(rcg->mnd_width) - 1;
449 regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m);
450 regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m);
452 n = (~(notn_m) + m) & mask;
454 duty_per = (duty->num * 100) / duty->den;
456 /* Calculate 2d value */
457 d = DIV_ROUND_CLOSEST(n * duty_per * 2, 100);
459 /* Check bit widths of 2d. If D is too big reduce duty cycle. */
463 if ((d / 2) > (n - m))
465 else if ((d / 2) < (m / 2))
470 ret = regmap_update_bits(rcg->clkr.regmap, RCG_D_OFFSET(rcg), mask,
475 return update_config(rcg);
478 const struct clk_ops clk_rcg2_ops = {
479 .is_enabled = clk_rcg2_is_enabled,
480 .get_parent = clk_rcg2_get_parent,
481 .set_parent = clk_rcg2_set_parent,
482 .recalc_rate = clk_rcg2_recalc_rate,
483 .determine_rate = clk_rcg2_determine_rate,
484 .set_rate = clk_rcg2_set_rate,
485 .set_rate_and_parent = clk_rcg2_set_rate_and_parent,
486 .get_duty_cycle = clk_rcg2_get_duty_cycle,
487 .set_duty_cycle = clk_rcg2_set_duty_cycle,
489 EXPORT_SYMBOL_GPL(clk_rcg2_ops);
491 const struct clk_ops clk_rcg2_floor_ops = {
492 .is_enabled = clk_rcg2_is_enabled,
493 .get_parent = clk_rcg2_get_parent,
494 .set_parent = clk_rcg2_set_parent,
495 .recalc_rate = clk_rcg2_recalc_rate,
496 .determine_rate = clk_rcg2_determine_floor_rate,
497 .set_rate = clk_rcg2_set_floor_rate,
498 .set_rate_and_parent = clk_rcg2_set_floor_rate_and_parent,
499 .get_duty_cycle = clk_rcg2_get_duty_cycle,
500 .set_duty_cycle = clk_rcg2_set_duty_cycle,
502 EXPORT_SYMBOL_GPL(clk_rcg2_floor_ops);
509 static const struct frac_entry frac_table_675m[] = { /* link rate of 270M */
510 { 52, 295 }, /* 119 M */
511 { 11, 57 }, /* 130.25 M */
512 { 63, 307 }, /* 138.50 M */
513 { 11, 50 }, /* 148.50 M */
514 { 47, 206 }, /* 154 M */
515 { 31, 100 }, /* 205.25 M */
516 { 107, 269 }, /* 268.50 M */
520 static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */
521 { 31, 211 }, /* 119 M */
522 { 32, 199 }, /* 130.25 M */
523 { 63, 307 }, /* 138.50 M */
524 { 11, 60 }, /* 148.50 M */
525 { 50, 263 }, /* 154 M */
526 { 31, 120 }, /* 205.25 M */
527 { 119, 359 }, /* 268.50 M */
531 static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
532 unsigned long parent_rate)
534 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
535 struct freq_tbl f = *rcg->freq_tbl;
536 const struct frac_entry *frac;
538 s64 src_rate = parent_rate;
540 u32 mask = BIT(rcg->hid_width) - 1;
543 if (src_rate == 810000000)
544 frac = frac_table_810m;
546 frac = frac_table_675m;
548 for (; frac->num; frac++) {
550 request *= frac->den;
551 request = div_s64(request, frac->num);
552 if ((src_rate < (request - delta)) ||
553 (src_rate > (request + delta)))
556 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
559 f.pre_div >>= CFG_SRC_DIV_SHIFT;
564 return clk_rcg2_configure(rcg, &f);
570 static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw,
571 unsigned long rate, unsigned long parent_rate, u8 index)
573 /* Parent index is set statically in frequency table */
574 return clk_edp_pixel_set_rate(hw, rate, parent_rate);
577 static int clk_edp_pixel_determine_rate(struct clk_hw *hw,
578 struct clk_rate_request *req)
580 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
581 const struct freq_tbl *f = rcg->freq_tbl;
582 const struct frac_entry *frac;
585 u32 mask = BIT(rcg->hid_width) - 1;
587 int index = qcom_find_src_index(hw, rcg->parent_map, f->src);
589 /* Force the correct parent */
590 req->best_parent_hw = clk_hw_get_parent_by_index(hw, index);
591 req->best_parent_rate = clk_hw_get_rate(req->best_parent_hw);
593 if (req->best_parent_rate == 810000000)
594 frac = frac_table_810m;
596 frac = frac_table_675m;
598 for (; frac->num; frac++) {
600 request *= frac->den;
601 request = div_s64(request, frac->num);
602 if ((req->best_parent_rate < (request - delta)) ||
603 (req->best_parent_rate > (request + delta)))
606 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
608 hid_div >>= CFG_SRC_DIV_SHIFT;
611 req->rate = calc_rate(req->best_parent_rate,
612 frac->num, frac->den,
613 !!frac->den, hid_div);
620 const struct clk_ops clk_edp_pixel_ops = {
621 .is_enabled = clk_rcg2_is_enabled,
622 .get_parent = clk_rcg2_get_parent,
623 .set_parent = clk_rcg2_set_parent,
624 .recalc_rate = clk_rcg2_recalc_rate,
625 .set_rate = clk_edp_pixel_set_rate,
626 .set_rate_and_parent = clk_edp_pixel_set_rate_and_parent,
627 .determine_rate = clk_edp_pixel_determine_rate,
629 EXPORT_SYMBOL_GPL(clk_edp_pixel_ops);
631 static int clk_byte_determine_rate(struct clk_hw *hw,
632 struct clk_rate_request *req)
634 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
635 const struct freq_tbl *f = rcg->freq_tbl;
636 int index = qcom_find_src_index(hw, rcg->parent_map, f->src);
637 unsigned long parent_rate, div;
638 u32 mask = BIT(rcg->hid_width) - 1;
644 req->best_parent_hw = p = clk_hw_get_parent_by_index(hw, index);
645 req->best_parent_rate = parent_rate = clk_hw_round_rate(p, req->rate);
647 div = DIV_ROUND_UP((2 * parent_rate), req->rate) - 1;
648 div = min_t(u32, div, mask);
650 req->rate = calc_rate(parent_rate, 0, 0, 0, div);
655 static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate,
656 unsigned long parent_rate)
658 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
659 struct freq_tbl f = *rcg->freq_tbl;
661 u32 mask = BIT(rcg->hid_width) - 1;
663 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
664 div = min_t(u32, div, mask);
668 return clk_rcg2_configure(rcg, &f);
671 static int clk_byte_set_rate_and_parent(struct clk_hw *hw,
672 unsigned long rate, unsigned long parent_rate, u8 index)
674 /* Parent index is set statically in frequency table */
675 return clk_byte_set_rate(hw, rate, parent_rate);
678 const struct clk_ops clk_byte_ops = {
679 .is_enabled = clk_rcg2_is_enabled,
680 .get_parent = clk_rcg2_get_parent,
681 .set_parent = clk_rcg2_set_parent,
682 .recalc_rate = clk_rcg2_recalc_rate,
683 .set_rate = clk_byte_set_rate,
684 .set_rate_and_parent = clk_byte_set_rate_and_parent,
685 .determine_rate = clk_byte_determine_rate,
687 EXPORT_SYMBOL_GPL(clk_byte_ops);
689 static int clk_byte2_determine_rate(struct clk_hw *hw,
690 struct clk_rate_request *req)
692 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
693 unsigned long parent_rate, div;
694 u32 mask = BIT(rcg->hid_width) - 1;
696 unsigned long rate = req->rate;
701 p = req->best_parent_hw;
702 req->best_parent_rate = parent_rate = clk_hw_round_rate(p, rate);
704 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
705 div = min_t(u32, div, mask);
707 req->rate = calc_rate(parent_rate, 0, 0, 0, div);
712 static int clk_byte2_set_rate(struct clk_hw *hw, unsigned long rate,
713 unsigned long parent_rate)
715 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
716 struct freq_tbl f = { 0 };
718 int i, num_parents = clk_hw_get_num_parents(hw);
719 u32 mask = BIT(rcg->hid_width) - 1;
722 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
723 div = min_t(u32, div, mask);
727 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
728 cfg &= CFG_SRC_SEL_MASK;
729 cfg >>= CFG_SRC_SEL_SHIFT;
731 for (i = 0; i < num_parents; i++) {
732 if (cfg == rcg->parent_map[i].cfg) {
733 f.src = rcg->parent_map[i].src;
734 return clk_rcg2_configure(rcg, &f);
741 static int clk_byte2_set_rate_and_parent(struct clk_hw *hw,
742 unsigned long rate, unsigned long parent_rate, u8 index)
744 /* Read the hardware to determine parent during set_rate */
745 return clk_byte2_set_rate(hw, rate, parent_rate);
748 const struct clk_ops clk_byte2_ops = {
749 .is_enabled = clk_rcg2_is_enabled,
750 .get_parent = clk_rcg2_get_parent,
751 .set_parent = clk_rcg2_set_parent,
752 .recalc_rate = clk_rcg2_recalc_rate,
753 .set_rate = clk_byte2_set_rate,
754 .set_rate_and_parent = clk_byte2_set_rate_and_parent,
755 .determine_rate = clk_byte2_determine_rate,
757 EXPORT_SYMBOL_GPL(clk_byte2_ops);
759 static const struct frac_entry frac_table_pixel[] = {
768 static int clk_pixel_determine_rate(struct clk_hw *hw,
769 struct clk_rate_request *req)
771 unsigned long request, src_rate;
773 const struct frac_entry *frac = frac_table_pixel;
775 for (; frac->num; frac++) {
776 request = (req->rate * frac->den) / frac->num;
778 src_rate = clk_hw_round_rate(req->best_parent_hw, request);
779 if ((src_rate < (request - delta)) ||
780 (src_rate > (request + delta)))
783 req->best_parent_rate = src_rate;
784 req->rate = (src_rate * frac->num) / frac->den;
791 static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
792 unsigned long parent_rate)
794 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
795 struct freq_tbl f = { 0 };
796 const struct frac_entry *frac = frac_table_pixel;
797 unsigned long request;
799 u32 mask = BIT(rcg->hid_width) - 1;
801 int i, num_parents = clk_hw_get_num_parents(hw);
803 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
804 cfg &= CFG_SRC_SEL_MASK;
805 cfg >>= CFG_SRC_SEL_SHIFT;
807 for (i = 0; i < num_parents; i++)
808 if (cfg == rcg->parent_map[i].cfg) {
809 f.src = rcg->parent_map[i].src;
813 for (; frac->num; frac++) {
814 request = (rate * frac->den) / frac->num;
816 if ((parent_rate < (request - delta)) ||
817 (parent_rate > (request + delta)))
820 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
823 f.pre_div >>= CFG_SRC_DIV_SHIFT;
828 return clk_rcg2_configure(rcg, &f);
833 static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
834 unsigned long parent_rate, u8 index)
836 return clk_pixel_set_rate(hw, rate, parent_rate);
839 const struct clk_ops clk_pixel_ops = {
840 .is_enabled = clk_rcg2_is_enabled,
841 .get_parent = clk_rcg2_get_parent,
842 .set_parent = clk_rcg2_set_parent,
843 .recalc_rate = clk_rcg2_recalc_rate,
844 .set_rate = clk_pixel_set_rate,
845 .set_rate_and_parent = clk_pixel_set_rate_and_parent,
846 .determine_rate = clk_pixel_determine_rate,
848 EXPORT_SYMBOL_GPL(clk_pixel_ops);
850 static int clk_gfx3d_determine_rate(struct clk_hw *hw,
851 struct clk_rate_request *req)
853 struct clk_rate_request parent_req = { .min_rate = 0, .max_rate = ULONG_MAX };
854 struct clk_rcg2_gfx3d *cgfx = to_clk_rcg2_gfx3d(hw);
855 struct clk_hw *xo, *p0, *p1, *p2;
856 unsigned long p0_rate;
857 u8 mux_div = cgfx->div;
864 * This function does ping-pong the RCG between PLLs: if we don't
865 * have at least one fixed PLL and two variable ones,
866 * then it's not going to work correctly.
868 if (WARN_ON(!p0 || !p1 || !p2))
871 xo = clk_hw_get_parent_by_index(hw, 0);
872 if (req->rate == clk_hw_get_rate(xo)) {
873 req->best_parent_hw = xo;
880 parent_req.rate = req->rate * mux_div;
882 /* This has to be a fixed rate PLL */
883 p0_rate = clk_hw_get_rate(p0);
885 if (parent_req.rate == p0_rate) {
886 req->rate = req->best_parent_rate = p0_rate;
887 req->best_parent_hw = p0;
891 if (req->best_parent_hw == p0) {
892 /* Are we going back to a previously used rate? */
893 if (clk_hw_get_rate(p2) == parent_req.rate)
894 req->best_parent_hw = p2;
896 req->best_parent_hw = p1;
897 } else if (req->best_parent_hw == p2) {
898 req->best_parent_hw = p1;
900 req->best_parent_hw = p2;
903 ret = __clk_determine_rate(req->best_parent_hw, &parent_req);
907 req->rate = req->best_parent_rate = parent_req.rate;
908 req->rate /= mux_div;
913 static int clk_gfx3d_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
914 unsigned long parent_rate, u8 index)
916 struct clk_rcg2_gfx3d *cgfx = to_clk_rcg2_gfx3d(hw);
917 struct clk_rcg2 *rcg = &cgfx->rcg;
921 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
922 /* On some targets, the GFX3D RCG may need to divide PLL frequency */
924 cfg |= ((2 * cgfx->div) - 1) << CFG_SRC_DIV_SHIFT;
926 ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, cfg);
930 return update_config(rcg);
933 static int clk_gfx3d_set_rate(struct clk_hw *hw, unsigned long rate,
934 unsigned long parent_rate)
937 * We should never get here; clk_gfx3d_determine_rate() should always
938 * make us use a different parent than what we're currently using, so
939 * clk_gfx3d_set_rate_and_parent() should always be called.
944 const struct clk_ops clk_gfx3d_ops = {
945 .is_enabled = clk_rcg2_is_enabled,
946 .get_parent = clk_rcg2_get_parent,
947 .set_parent = clk_rcg2_set_parent,
948 .recalc_rate = clk_rcg2_recalc_rate,
949 .set_rate = clk_gfx3d_set_rate,
950 .set_rate_and_parent = clk_gfx3d_set_rate_and_parent,
951 .determine_rate = clk_gfx3d_determine_rate,
953 EXPORT_SYMBOL_GPL(clk_gfx3d_ops);
955 static int clk_rcg2_set_force_enable(struct clk_hw *hw)
957 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
958 const char *name = clk_hw_get_name(hw);
961 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
962 CMD_ROOT_EN, CMD_ROOT_EN);
966 /* wait for RCG to turn ON */
967 for (count = 500; count > 0; count--) {
968 if (clk_rcg2_is_enabled(hw))
974 pr_err("%s: RCG did not turn on\n", name);
978 static int clk_rcg2_clear_force_enable(struct clk_hw *hw)
980 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
982 return regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
987 clk_rcg2_shared_force_enable_clear(struct clk_hw *hw, const struct freq_tbl *f)
989 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
992 ret = clk_rcg2_set_force_enable(hw);
996 ret = clk_rcg2_configure(rcg, f);
1000 return clk_rcg2_clear_force_enable(hw);
1003 static int clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate,
1004 unsigned long parent_rate)
1006 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1007 const struct freq_tbl *f;
1009 f = qcom_find_freq(rcg->freq_tbl, rate);
1014 * In case clock is disabled, update the M, N and D registers, cache
1015 * the CFG value in parked_cfg and don't hit the update bit of CMD
1018 if (!clk_hw_is_enabled(hw))
1019 return __clk_rcg2_configure(rcg, f, &rcg->parked_cfg);
1021 return clk_rcg2_shared_force_enable_clear(hw, f);
1024 static int clk_rcg2_shared_set_rate_and_parent(struct clk_hw *hw,
1025 unsigned long rate, unsigned long parent_rate, u8 index)
1027 return clk_rcg2_shared_set_rate(hw, rate, parent_rate);
1030 static int clk_rcg2_shared_enable(struct clk_hw *hw)
1032 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1036 * Set the update bit because required configuration has already
1037 * been written in clk_rcg2_shared_set_rate()
1039 ret = clk_rcg2_set_force_enable(hw);
1043 /* Write back the stored configuration corresponding to current rate */
1044 ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, rcg->parked_cfg);
1048 ret = update_config(rcg);
1052 return clk_rcg2_clear_force_enable(hw);
1055 static void clk_rcg2_shared_disable(struct clk_hw *hw)
1057 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1060 * Store current configuration as switching to safe source would clear
1061 * the SRC and DIV of CFG register
1063 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &rcg->parked_cfg);
1066 * Park the RCG at a safe configuration - sourced off of safe source.
1067 * Force enable and disable the RCG while configuring it to safeguard
1068 * against any update signal coming from the downstream clock.
1069 * The current parent is still prepared and enabled at this point, and
1070 * the safe source is always on while application processor subsystem
1071 * is online. Therefore, the RCG can safely switch its parent.
1073 clk_rcg2_set_force_enable(hw);
1075 regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
1076 rcg->safe_src_index << CFG_SRC_SEL_SHIFT);
1080 clk_rcg2_clear_force_enable(hw);
1083 static u8 clk_rcg2_shared_get_parent(struct clk_hw *hw)
1085 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1087 /* If the shared rcg is parked use the cached cfg instead */
1088 if (!clk_hw_is_enabled(hw))
1089 return __clk_rcg2_get_parent(hw, rcg->parked_cfg);
1091 return clk_rcg2_get_parent(hw);
1094 static int clk_rcg2_shared_set_parent(struct clk_hw *hw, u8 index)
1096 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1098 /* If the shared rcg is parked only update the cached cfg */
1099 if (!clk_hw_is_enabled(hw)) {
1100 rcg->parked_cfg &= ~CFG_SRC_SEL_MASK;
1101 rcg->parked_cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT;
1106 return clk_rcg2_set_parent(hw, index);
1109 static unsigned long
1110 clk_rcg2_shared_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
1112 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1114 /* If the shared rcg is parked use the cached cfg instead */
1115 if (!clk_hw_is_enabled(hw))
1116 return __clk_rcg2_recalc_rate(hw, parent_rate, rcg->parked_cfg);
1118 return clk_rcg2_recalc_rate(hw, parent_rate);
1121 const struct clk_ops clk_rcg2_shared_ops = {
1122 .enable = clk_rcg2_shared_enable,
1123 .disable = clk_rcg2_shared_disable,
1124 .get_parent = clk_rcg2_shared_get_parent,
1125 .set_parent = clk_rcg2_shared_set_parent,
1126 .recalc_rate = clk_rcg2_shared_recalc_rate,
1127 .determine_rate = clk_rcg2_determine_rate,
1128 .set_rate = clk_rcg2_shared_set_rate,
1129 .set_rate_and_parent = clk_rcg2_shared_set_rate_and_parent,
1131 EXPORT_SYMBOL_GPL(clk_rcg2_shared_ops);
1133 /* Common APIs to be used for DFS based RCGR */
1134 static void clk_rcg2_dfs_populate_freq(struct clk_hw *hw, unsigned int l,
1137 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1139 unsigned long prate = 0;
1140 u32 val, mask, cfg, mode, src;
1143 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_DFSR(l), &cfg);
1145 mask = BIT(rcg->hid_width) - 1;
1148 f->pre_div = cfg & mask;
1150 src = cfg & CFG_SRC_SEL_MASK;
1151 src >>= CFG_SRC_SEL_SHIFT;
1153 num_parents = clk_hw_get_num_parents(hw);
1154 for (i = 0; i < num_parents; i++) {
1155 if (src == rcg->parent_map[i].cfg) {
1156 f->src = rcg->parent_map[i].src;
1157 p = clk_hw_get_parent_by_index(&rcg->clkr.hw, i);
1158 prate = clk_hw_get_rate(p);
1162 mode = cfg & CFG_MODE_MASK;
1163 mode >>= CFG_MODE_SHIFT;
1165 mask = BIT(rcg->mnd_width) - 1;
1166 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_M_DFSR(l),
1171 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_N_DFSR(l),
1179 f->freq = calc_rate(prate, f->m, f->n, mode, f->pre_div);
1182 static int clk_rcg2_dfs_populate_freq_table(struct clk_rcg2 *rcg)
1184 struct freq_tbl *freq_tbl;
1187 /* Allocate space for 1 extra since table is NULL terminated */
1188 freq_tbl = kcalloc(MAX_PERF_LEVEL + 1, sizeof(*freq_tbl), GFP_KERNEL);
1191 rcg->freq_tbl = freq_tbl;
1193 for (i = 0; i < MAX_PERF_LEVEL; i++)
1194 clk_rcg2_dfs_populate_freq(&rcg->clkr.hw, i, freq_tbl + i);
1199 static int clk_rcg2_dfs_determine_rate(struct clk_hw *hw,
1200 struct clk_rate_request *req)
1202 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1205 if (!rcg->freq_tbl) {
1206 ret = clk_rcg2_dfs_populate_freq_table(rcg);
1208 pr_err("Failed to update DFS tables for %s\n",
1209 clk_hw_get_name(hw));
1214 return clk_rcg2_determine_rate(hw, req);
1217 static unsigned long
1218 clk_rcg2_dfs_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
1220 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1221 u32 level, mask, cfg, m = 0, n = 0, mode, pre_div;
1223 regmap_read(rcg->clkr.regmap,
1224 rcg->cmd_rcgr + SE_CMD_DFSR_OFFSET, &level);
1225 level &= GENMASK(4, 1);
1229 return rcg->freq_tbl[level].freq;
1232 * Assume that parent_rate is actually the parent because
1233 * we can't do any better at figuring it out when the table
1234 * hasn't been populated yet. We only populate the table
1235 * in determine_rate because we can't guarantee the parents
1236 * will be registered with the framework until then.
1238 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_DFSR(level),
1241 mask = BIT(rcg->hid_width) - 1;
1244 pre_div = cfg & mask;
1246 mode = cfg & CFG_MODE_MASK;
1247 mode >>= CFG_MODE_SHIFT;
1249 mask = BIT(rcg->mnd_width) - 1;
1250 regmap_read(rcg->clkr.regmap,
1251 rcg->cmd_rcgr + SE_PERF_M_DFSR(level), &m);
1254 regmap_read(rcg->clkr.regmap,
1255 rcg->cmd_rcgr + SE_PERF_N_DFSR(level), &n);
1261 return calc_rate(parent_rate, m, n, mode, pre_div);
1264 static const struct clk_ops clk_rcg2_dfs_ops = {
1265 .is_enabled = clk_rcg2_is_enabled,
1266 .get_parent = clk_rcg2_get_parent,
1267 .determine_rate = clk_rcg2_dfs_determine_rate,
1268 .recalc_rate = clk_rcg2_dfs_recalc_rate,
1271 static int clk_rcg2_enable_dfs(const struct clk_rcg_dfs_data *data,
1272 struct regmap *regmap)
1274 struct clk_rcg2 *rcg = data->rcg;
1275 struct clk_init_data *init = data->init;
1279 ret = regmap_read(regmap, rcg->cmd_rcgr + SE_CMD_DFSR_OFFSET, &val);
1283 if (!(val & SE_CMD_DFS_EN))
1287 * Rate changes with consumer writing a register in
1288 * their own I/O region
1290 init->flags |= CLK_GET_RATE_NOCACHE;
1291 init->ops = &clk_rcg2_dfs_ops;
1293 rcg->freq_tbl = NULL;
1298 int qcom_cc_register_rcg_dfs(struct regmap *regmap,
1299 const struct clk_rcg_dfs_data *rcgs, size_t len)
1303 for (i = 0; i < len; i++) {
1304 ret = clk_rcg2_enable_dfs(&rcgs[i], regmap);
1311 EXPORT_SYMBOL_GPL(qcom_cc_register_rcg_dfs);
1313 static int clk_rcg2_dp_set_rate(struct clk_hw *hw, unsigned long rate,
1314 unsigned long parent_rate)
1316 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1317 struct freq_tbl f = { 0 };
1318 u32 mask = BIT(rcg->hid_width) - 1;
1320 int i, num_parents = clk_hw_get_num_parents(hw);
1321 unsigned long num, den;
1323 rational_best_approximation(parent_rate, rate,
1324 GENMASK(rcg->mnd_width - 1, 0),
1325 GENMASK(rcg->mnd_width - 1, 0), &den, &num);
1330 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
1332 cfg &= CFG_SRC_SEL_MASK;
1333 cfg >>= CFG_SRC_SEL_SHIFT;
1335 for (i = 0; i < num_parents; i++) {
1336 if (cfg == rcg->parent_map[i].cfg) {
1337 f.src = rcg->parent_map[i].src;
1342 f.pre_div = hid_div;
1343 f.pre_div >>= CFG_SRC_DIV_SHIFT;
1354 return clk_rcg2_configure(rcg, &f);
1357 static int clk_rcg2_dp_set_rate_and_parent(struct clk_hw *hw,
1358 unsigned long rate, unsigned long parent_rate, u8 index)
1360 return clk_rcg2_dp_set_rate(hw, rate, parent_rate);
1363 static int clk_rcg2_dp_determine_rate(struct clk_hw *hw,
1364 struct clk_rate_request *req)
1366 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
1367 unsigned long num, den;
1370 /* Parent rate is a fixed phy link rate */
1371 rational_best_approximation(req->best_parent_rate, req->rate,
1372 GENMASK(rcg->mnd_width - 1, 0),
1373 GENMASK(rcg->mnd_width - 1, 0), &den, &num);
1378 tmp = req->best_parent_rate * num;
1385 const struct clk_ops clk_dp_ops = {
1386 .is_enabled = clk_rcg2_is_enabled,
1387 .get_parent = clk_rcg2_get_parent,
1388 .set_parent = clk_rcg2_set_parent,
1389 .recalc_rate = clk_rcg2_recalc_rate,
1390 .set_rate = clk_rcg2_dp_set_rate,
1391 .set_rate_and_parent = clk_rcg2_dp_set_rate_and_parent,
1392 .determine_rate = clk_rcg2_dp_determine_rate,
1394 EXPORT_SYMBOL_GPL(clk_dp_ops);