2 * Copyright (c) 2013, The Linux Foundation. All rights reserved.
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.
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.
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>
24 #include <asm/div64.h>
29 #define CMD_UPDATE BIT(0)
30 #define CMD_ROOT_EN BIT(1)
31 #define CMD_DIRTY_CFG BIT(4)
32 #define CMD_DIRTY_N BIT(5)
33 #define CMD_DIRTY_M BIT(6)
34 #define CMD_DIRTY_D BIT(7)
35 #define CMD_ROOT_OFF BIT(31)
38 #define CFG_SRC_DIV_SHIFT 0
39 #define CFG_SRC_SEL_SHIFT 8
40 #define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT)
41 #define CFG_MODE_SHIFT 12
42 #define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT)
43 #define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT)
49 static int clk_rcg2_is_enabled(struct clk_hw *hw)
51 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
55 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
59 return (cmd & CMD_ROOT_OFF) == 0;
62 static u8 clk_rcg2_get_parent(struct clk_hw *hw)
64 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
65 int num_parents = __clk_get_num_parents(hw->clk);
69 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
73 cfg &= CFG_SRC_SEL_MASK;
74 cfg >>= CFG_SRC_SEL_SHIFT;
76 for (i = 0; i < num_parents; i++)
77 if (cfg == rcg->parent_map[i])
83 static int update_config(struct clk_rcg2 *rcg)
87 struct clk_hw *hw = &rcg->clkr.hw;
88 const char *name = __clk_get_name(hw->clk);
90 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG,
91 CMD_UPDATE, CMD_UPDATE);
95 /* Wait for update to take effect */
96 for (count = 500; count > 0; count--) {
97 ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd);
100 if (!(cmd & CMD_UPDATE))
105 WARN(1, "%s: rcg didn't update its configuration.", name);
109 static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
111 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
114 ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
116 rcg->parent_map[index] << CFG_SRC_SEL_SHIFT);
120 return update_config(rcg);
124 * Calculate m/n:d rate
127 * rate = ----------- x ---
131 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div)
149 clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
151 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
152 u32 cfg, hid_div, m = 0, n = 0, mode = 0, mask;
154 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg);
156 if (rcg->mnd_width) {
157 mask = BIT(rcg->mnd_width) - 1;
158 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m);
160 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &n);
164 mode = cfg & CFG_MODE_MASK;
165 mode >>= CFG_MODE_SHIFT;
168 mask = BIT(rcg->hid_width) - 1;
169 hid_div = cfg >> CFG_SRC_DIV_SHIFT;
172 return calc_rate(parent_rate, m, n, mode, hid_div);
176 struct freq_tbl *find_freq(const struct freq_tbl *f, unsigned long rate)
185 /* Default to our fastest rate */
189 static long _freq_tbl_determine_rate(struct clk_hw *hw,
190 const struct freq_tbl *f, unsigned long rate,
191 unsigned long *p_rate, struct clk **p)
193 unsigned long clk_flags;
195 f = find_freq(f, rate);
199 clk_flags = __clk_get_flags(hw->clk);
200 *p = clk_get_parent_by_index(hw->clk, f->src);
201 if (clk_flags & CLK_SET_RATE_PARENT) {
205 rate *= f->pre_div + 1;
215 rate = __clk_get_rate(*p);
222 static long clk_rcg2_determine_rate(struct clk_hw *hw, unsigned long rate,
223 unsigned long *p_rate, struct clk **p)
225 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
227 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, p_rate, p);
230 static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f)
235 if (rcg->mnd_width && f->n) {
236 mask = BIT(rcg->mnd_width) - 1;
237 ret = regmap_update_bits(rcg->clkr.regmap,
238 rcg->cmd_rcgr + M_REG, mask, f->m);
242 ret = regmap_update_bits(rcg->clkr.regmap,
243 rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m));
247 ret = regmap_update_bits(rcg->clkr.regmap,
248 rcg->cmd_rcgr + D_REG, mask, ~f->n);
253 mask = BIT(rcg->hid_width) - 1;
254 mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK;
255 cfg = f->pre_div << CFG_SRC_DIV_SHIFT;
256 cfg |= rcg->parent_map[f->src] << CFG_SRC_SEL_SHIFT;
257 if (rcg->mnd_width && f->n && (f->m != f->n))
258 cfg |= CFG_MODE_DUAL_EDGE;
259 ret = regmap_update_bits(rcg->clkr.regmap,
260 rcg->cmd_rcgr + CFG_REG, mask, cfg);
264 return update_config(rcg);
267 static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate)
269 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
270 const struct freq_tbl *f;
272 f = find_freq(rcg->freq_tbl, rate);
276 return clk_rcg2_configure(rcg, f);
279 static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate,
280 unsigned long parent_rate)
282 return __clk_rcg2_set_rate(hw, rate);
285 static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw,
286 unsigned long rate, unsigned long parent_rate, u8 index)
288 return __clk_rcg2_set_rate(hw, rate);
291 const struct clk_ops clk_rcg2_ops = {
292 .is_enabled = clk_rcg2_is_enabled,
293 .get_parent = clk_rcg2_get_parent,
294 .set_parent = clk_rcg2_set_parent,
295 .recalc_rate = clk_rcg2_recalc_rate,
296 .determine_rate = clk_rcg2_determine_rate,
297 .set_rate = clk_rcg2_set_rate,
298 .set_rate_and_parent = clk_rcg2_set_rate_and_parent,
300 EXPORT_SYMBOL_GPL(clk_rcg2_ops);
307 static const struct frac_entry frac_table_675m[] = { /* link rate of 270M */
308 { 52, 295 }, /* 119 M */
309 { 11, 57 }, /* 130.25 M */
310 { 63, 307 }, /* 138.50 M */
311 { 11, 50 }, /* 148.50 M */
312 { 47, 206 }, /* 154 M */
313 { 31, 100 }, /* 205.25 M */
314 { 107, 269 }, /* 268.50 M */
318 static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */
319 { 31, 211 }, /* 119 M */
320 { 32, 199 }, /* 130.25 M */
321 { 63, 307 }, /* 138.50 M */
322 { 11, 60 }, /* 148.50 M */
323 { 50, 263 }, /* 154 M */
324 { 31, 120 }, /* 205.25 M */
325 { 119, 359 }, /* 268.50 M */
329 static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
330 unsigned long parent_rate)
332 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
333 struct freq_tbl f = *rcg->freq_tbl;
334 const struct frac_entry *frac;
336 s64 src_rate = parent_rate;
338 u32 mask = BIT(rcg->hid_width) - 1;
341 if (src_rate == 810000000)
342 frac = frac_table_810m;
344 frac = frac_table_675m;
346 for (; frac->num; frac++) {
348 request *= frac->den;
349 request = div_s64(request, frac->num);
350 if ((src_rate < (request - delta)) ||
351 (src_rate > (request + delta)))
354 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
357 f.pre_div >>= CFG_SRC_DIV_SHIFT;
362 return clk_rcg2_configure(rcg, &f);
368 static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw,
369 unsigned long rate, unsigned long parent_rate, u8 index)
371 /* Parent index is set statically in frequency table */
372 return clk_edp_pixel_set_rate(hw, rate, parent_rate);
375 static long clk_edp_pixel_determine_rate(struct clk_hw *hw, unsigned long rate,
376 unsigned long *p_rate, struct clk **p)
378 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
379 const struct freq_tbl *f = rcg->freq_tbl;
380 const struct frac_entry *frac;
382 s64 src_rate = *p_rate;
384 u32 mask = BIT(rcg->hid_width) - 1;
387 /* Force the correct parent */
388 *p = clk_get_parent_by_index(hw->clk, f->src);
390 if (src_rate == 810000000)
391 frac = frac_table_810m;
393 frac = frac_table_675m;
395 for (; frac->num; frac++) {
397 request *= frac->den;
398 request = div_s64(request, frac->num);
399 if ((src_rate < (request - delta)) ||
400 (src_rate > (request + delta)))
403 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
405 hid_div >>= CFG_SRC_DIV_SHIFT;
408 return calc_rate(src_rate, frac->num, frac->den, !!frac->den,
415 const struct clk_ops clk_edp_pixel_ops = {
416 .is_enabled = clk_rcg2_is_enabled,
417 .get_parent = clk_rcg2_get_parent,
418 .set_parent = clk_rcg2_set_parent,
419 .recalc_rate = clk_rcg2_recalc_rate,
420 .set_rate = clk_edp_pixel_set_rate,
421 .set_rate_and_parent = clk_edp_pixel_set_rate_and_parent,
422 .determine_rate = clk_edp_pixel_determine_rate,
424 EXPORT_SYMBOL_GPL(clk_edp_pixel_ops);
426 static long clk_byte_determine_rate(struct clk_hw *hw, unsigned long rate,
427 unsigned long *p_rate, struct clk **p)
429 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
430 const struct freq_tbl *f = rcg->freq_tbl;
431 unsigned long parent_rate, div;
432 u32 mask = BIT(rcg->hid_width) - 1;
437 *p = clk_get_parent_by_index(hw->clk, f->src);
438 *p_rate = parent_rate = __clk_round_rate(*p, rate);
440 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
441 div = min_t(u32, div, mask);
443 return calc_rate(parent_rate, 0, 0, 0, div);
446 static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate,
447 unsigned long parent_rate)
449 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
450 struct freq_tbl f = *rcg->freq_tbl;
452 u32 mask = BIT(rcg->hid_width) - 1;
454 div = DIV_ROUND_UP((2 * parent_rate), rate) - 1;
455 div = min_t(u32, div, mask);
459 return clk_rcg2_configure(rcg, &f);
462 static int clk_byte_set_rate_and_parent(struct clk_hw *hw,
463 unsigned long rate, unsigned long parent_rate, u8 index)
465 /* Parent index is set statically in frequency table */
466 return clk_byte_set_rate(hw, rate, parent_rate);
469 const struct clk_ops clk_byte_ops = {
470 .is_enabled = clk_rcg2_is_enabled,
471 .get_parent = clk_rcg2_get_parent,
472 .set_parent = clk_rcg2_set_parent,
473 .recalc_rate = clk_rcg2_recalc_rate,
474 .set_rate = clk_byte_set_rate,
475 .set_rate_and_parent = clk_byte_set_rate_and_parent,
476 .determine_rate = clk_byte_determine_rate,
478 EXPORT_SYMBOL_GPL(clk_byte_ops);
480 static const struct frac_entry frac_table_pixel[] = {
488 static long clk_pixel_determine_rate(struct clk_hw *hw, unsigned long rate,
489 unsigned long *p_rate, struct clk **p)
491 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
492 unsigned long request, src_rate;
494 const struct freq_tbl *f = rcg->freq_tbl;
495 const struct frac_entry *frac = frac_table_pixel;
496 struct clk *parent = *p = clk_get_parent_by_index(hw->clk, f->src);
498 for (; frac->num; frac++) {
499 request = (rate * frac->den) / frac->num;
501 src_rate = __clk_round_rate(parent, request);
502 if ((src_rate < (request - delta)) ||
503 (src_rate > (request + delta)))
507 return (src_rate * frac->num) / frac->den;
513 static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate,
514 unsigned long parent_rate)
516 struct clk_rcg2 *rcg = to_clk_rcg2(hw);
517 struct freq_tbl f = *rcg->freq_tbl;
518 const struct frac_entry *frac = frac_table_pixel;
519 unsigned long request, src_rate;
521 u32 mask = BIT(rcg->hid_width) - 1;
523 struct clk *parent = clk_get_parent_by_index(hw->clk, f.src);
525 for (; frac->num; frac++) {
526 request = (rate * frac->den) / frac->num;
528 src_rate = __clk_round_rate(parent, request);
529 if ((src_rate < (request - delta)) ||
530 (src_rate > (request + delta)))
533 regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG,
536 f.pre_div >>= CFG_SRC_DIV_SHIFT;
541 return clk_rcg2_configure(rcg, &f);
546 static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate,
547 unsigned long parent_rate, u8 index)
549 /* Parent index is set statically in frequency table */
550 return clk_pixel_set_rate(hw, rate, parent_rate);
553 const struct clk_ops clk_pixel_ops = {
554 .is_enabled = clk_rcg2_is_enabled,
555 .get_parent = clk_rcg2_get_parent,
556 .set_parent = clk_rcg2_set_parent,
557 .recalc_rate = clk_rcg2_recalc_rate,
558 .set_rate = clk_pixel_set_rate,
559 .set_rate_and_parent = clk_pixel_set_rate_and_parent,
560 .determine_rate = clk_pixel_determine_rate,
562 EXPORT_SYMBOL_GPL(clk_pixel_ops);