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/export.h>
18 #include <linux/clk-provider.h>
19 #include <linux/regmap.h>
21 #include <asm/div64.h>
26 static u32 ns_to_src(struct src_sel *s, u32 ns)
28 ns >>= s->src_sel_shift;
33 static u32 src_to_ns(struct src_sel *s, u8 src, u32 ns)
38 mask <<= s->src_sel_shift;
41 ns |= src << s->src_sel_shift;
45 static u8 clk_rcg_get_parent(struct clk_hw *hw)
47 struct clk_rcg *rcg = to_clk_rcg(hw);
48 int num_parents = __clk_get_num_parents(hw->clk);
52 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
53 ns = ns_to_src(&rcg->s, ns);
54 for (i = 0; i < num_parents; i++)
55 if (ns == rcg->s.parent_map[i])
61 static int reg_to_bank(struct clk_dyn_rcg *rcg, u32 bank)
63 bank &= BIT(rcg->mux_sel_bit);
67 static u8 clk_dyn_rcg_get_parent(struct clk_hw *hw)
69 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
70 int num_parents = __clk_get_num_parents(hw->clk);
76 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
77 bank = reg_to_bank(rcg, reg);
80 regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
81 ns = ns_to_src(s, ns);
83 for (i = 0; i < num_parents; i++)
84 if (ns == s->parent_map[i])
90 static int clk_rcg_set_parent(struct clk_hw *hw, u8 index)
92 struct clk_rcg *rcg = to_clk_rcg(hw);
95 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
96 ns = src_to_ns(&rcg->s, rcg->s.parent_map[index], ns);
97 regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
102 static u32 md_to_m(struct mn *mn, u32 md)
104 md >>= mn->m_val_shift;
105 md &= BIT(mn->width) - 1;
109 static u32 ns_to_pre_div(struct pre_div *p, u32 ns)
111 ns >>= p->pre_div_shift;
112 ns &= BIT(p->pre_div_width) - 1;
116 static u32 pre_div_to_ns(struct pre_div *p, u8 pre_div, u32 ns)
120 mask = BIT(p->pre_div_width) - 1;
121 mask <<= p->pre_div_shift;
124 ns |= pre_div << p->pre_div_shift;
128 static u32 mn_to_md(struct mn *mn, u32 m, u32 n, u32 md)
132 mask_w = BIT(mn->width) - 1;
133 mask = (mask_w << mn->m_val_shift) | mask_w;
137 m <<= mn->m_val_shift;
145 static u32 ns_m_to_n(struct mn *mn, u32 ns, u32 m)
147 ns = ~ns >> mn->n_val_shift;
148 ns &= BIT(mn->width) - 1;
152 static u32 reg_to_mnctr_mode(struct mn *mn, u32 val)
154 val >>= mn->mnctr_mode_shift;
155 val &= MNCTR_MODE_MASK;
159 static u32 mn_to_ns(struct mn *mn, u32 m, u32 n, u32 ns)
163 mask = BIT(mn->width) - 1;
164 mask <<= mn->n_val_shift;
170 n &= BIT(mn->width) - 1;
171 n <<= mn->n_val_shift;
178 static u32 mn_to_reg(struct mn *mn, u32 m, u32 n, u32 val)
182 mask = MNCTR_MODE_MASK << mn->mnctr_mode_shift;
183 mask |= BIT(mn->mnctr_en_bit);
187 val |= BIT(mn->mnctr_en_bit);
188 val |= MNCTR_MODE_DUAL << mn->mnctr_mode_shift;
194 static void configure_bank(struct clk_dyn_rcg *rcg, const struct freq_tbl *f)
203 bool banked_mn = !!rcg->mn[1].width;
204 bool banked_p = !!rcg->p[1].pre_div_width;
205 struct clk_hw *hw = &rcg->clkr.hw;
207 enabled = __clk_is_enabled(hw->clk);
209 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
210 bank = reg_to_bank(rcg, reg);
211 new_bank = enabled ? !bank : bank;
213 ns_reg = rcg->ns_reg[new_bank];
214 regmap_read(rcg->clkr.regmap, ns_reg, &ns);
217 mn = &rcg->mn[new_bank];
218 md_reg = rcg->md_reg[new_bank];
220 ns |= BIT(mn->mnctr_reset_bit);
221 regmap_write(rcg->clkr.regmap, ns_reg, ns);
223 regmap_read(rcg->clkr.regmap, md_reg, &md);
224 md = mn_to_md(mn, f->m, f->n, md);
225 regmap_write(rcg->clkr.regmap, md_reg, md);
227 ns = mn_to_ns(mn, f->m, f->n, ns);
228 regmap_write(rcg->clkr.regmap, ns_reg, ns);
230 /* Two NS registers means mode control is in NS register */
231 if (rcg->ns_reg[0] != rcg->ns_reg[1]) {
232 ns = mn_to_reg(mn, f->m, f->n, ns);
233 regmap_write(rcg->clkr.regmap, ns_reg, ns);
235 reg = mn_to_reg(mn, f->m, f->n, reg);
236 regmap_write(rcg->clkr.regmap, rcg->bank_reg, reg);
239 ns &= ~BIT(mn->mnctr_reset_bit);
240 regmap_write(rcg->clkr.regmap, ns_reg, ns);
244 p = &rcg->p[new_bank];
245 ns = pre_div_to_ns(p, f->pre_div - 1, ns);
248 s = &rcg->s[new_bank];
249 ns = src_to_ns(s, s->parent_map[f->src], ns);
250 regmap_write(rcg->clkr.regmap, ns_reg, ns);
253 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
254 reg ^= BIT(rcg->mux_sel_bit);
255 regmap_write(rcg->clkr.regmap, rcg->bank_reg, reg);
259 static int clk_dyn_rcg_set_parent(struct clk_hw *hw, u8 index)
261 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
264 struct freq_tbl f = { 0 };
265 bool banked_mn = !!rcg->mn[1].width;
266 bool banked_p = !!rcg->p[1].pre_div_width;
268 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
269 bank = reg_to_bank(rcg, reg);
271 regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
274 regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md);
275 f.m = md_to_m(&rcg->mn[bank], md);
276 f.n = ns_m_to_n(&rcg->mn[bank], ns, f.m);
280 f.pre_div = ns_to_pre_div(&rcg->p[bank], ns) + 1;
283 configure_bank(rcg, &f);
289 * Calculate m/n:d rate
292 * rate = ----------- x ---
296 calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 pre_div)
312 clk_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
314 struct clk_rcg *rcg = to_clk_rcg(hw);
315 u32 pre_div, m = 0, n = 0, ns, md, mode = 0;
316 struct mn *mn = &rcg->mn;
318 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
319 pre_div = ns_to_pre_div(&rcg->p, ns);
322 regmap_read(rcg->clkr.regmap, rcg->md_reg, &md);
324 n = ns_m_to_n(mn, ns, m);
325 /* MN counter mode is in hw.enable_reg sometimes */
326 if (rcg->clkr.enable_reg != rcg->ns_reg)
327 regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &mode);
330 mode = reg_to_mnctr_mode(mn, mode);
333 return calc_rate(parent_rate, m, n, mode, pre_div);
337 clk_dyn_rcg_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
339 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
340 u32 m, n, pre_div, ns, md, mode, reg;
343 bool banked_p = !!rcg->p[1].pre_div_width;
344 bool banked_mn = !!rcg->mn[1].width;
346 regmap_read(rcg->clkr.regmap, rcg->bank_reg, ®);
347 bank = reg_to_bank(rcg, reg);
349 regmap_read(rcg->clkr.regmap, rcg->ns_reg[bank], &ns);
350 m = n = pre_div = mode = 0;
354 regmap_read(rcg->clkr.regmap, rcg->md_reg[bank], &md);
356 n = ns_m_to_n(mn, ns, m);
357 /* Two NS registers means mode control is in NS register */
358 if (rcg->ns_reg[0] != rcg->ns_reg[1])
360 mode = reg_to_mnctr_mode(mn, reg);
364 pre_div = ns_to_pre_div(&rcg->p[bank], ns);
366 return calc_rate(parent_rate, m, n, mode, pre_div);
369 static long _freq_tbl_determine_rate(struct clk_hw *hw,
370 const struct freq_tbl *f, unsigned long rate,
371 unsigned long min_rate, unsigned long max_rate,
372 unsigned long *p_rate, struct clk_hw **p_hw)
374 unsigned long clk_flags;
377 f = qcom_find_freq(f, rate);
381 clk_flags = __clk_get_flags(hw->clk);
382 p = clk_get_parent_by_index(hw->clk, f->src);
383 if (clk_flags & CLK_SET_RATE_PARENT) {
384 rate = rate * f->pre_div;
392 rate = __clk_get_rate(p);
394 *p_hw = __clk_get_hw(p);
400 static long clk_rcg_determine_rate(struct clk_hw *hw, unsigned long rate,
401 unsigned long min_rate, unsigned long max_rate,
402 unsigned long *p_rate, struct clk_hw **p)
404 struct clk_rcg *rcg = to_clk_rcg(hw);
406 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, min_rate,
407 max_rate, p_rate, p);
410 static long clk_dyn_rcg_determine_rate(struct clk_hw *hw, unsigned long rate,
411 unsigned long min_rate, unsigned long max_rate,
412 unsigned long *p_rate, struct clk_hw **p)
414 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
416 return _freq_tbl_determine_rate(hw, rcg->freq_tbl, rate, min_rate,
417 max_rate, p_rate, p);
420 static long clk_rcg_bypass_determine_rate(struct clk_hw *hw, unsigned long rate,
421 unsigned long min_rate, unsigned long max_rate,
422 unsigned long *p_rate, struct clk_hw **p_hw)
424 struct clk_rcg *rcg = to_clk_rcg(hw);
425 const struct freq_tbl *f = rcg->freq_tbl;
428 p = clk_get_parent_by_index(hw->clk, f->src);
429 *p_hw = __clk_get_hw(p);
430 *p_rate = __clk_round_rate(p, rate);
435 static int __clk_rcg_set_rate(struct clk_rcg *rcg, const struct freq_tbl *f)
438 struct mn *mn = &rcg->mn;
440 unsigned int reset_reg;
442 if (rcg->mn.reset_in_cc)
443 reset_reg = rcg->clkr.enable_reg;
445 reset_reg = rcg->ns_reg;
448 mask = BIT(mn->mnctr_reset_bit);
449 regmap_update_bits(rcg->clkr.regmap, reset_reg, mask, mask);
451 regmap_read(rcg->clkr.regmap, rcg->md_reg, &md);
452 md = mn_to_md(mn, f->m, f->n, md);
453 regmap_write(rcg->clkr.regmap, rcg->md_reg, md);
455 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
456 /* MN counter mode is in hw.enable_reg sometimes */
457 if (rcg->clkr.enable_reg != rcg->ns_reg) {
458 regmap_read(rcg->clkr.regmap, rcg->clkr.enable_reg, &ctl);
459 ctl = mn_to_reg(mn, f->m, f->n, ctl);
460 regmap_write(rcg->clkr.regmap, rcg->clkr.enable_reg, ctl);
462 ns = mn_to_reg(mn, f->m, f->n, ns);
464 ns = mn_to_ns(mn, f->m, f->n, ns);
466 regmap_read(rcg->clkr.regmap, rcg->ns_reg, &ns);
469 ns = pre_div_to_ns(&rcg->p, f->pre_div - 1, ns);
470 regmap_write(rcg->clkr.regmap, rcg->ns_reg, ns);
472 regmap_update_bits(rcg->clkr.regmap, reset_reg, mask, 0);
477 static int clk_rcg_set_rate(struct clk_hw *hw, unsigned long rate,
478 unsigned long parent_rate)
480 struct clk_rcg *rcg = to_clk_rcg(hw);
481 const struct freq_tbl *f;
483 f = qcom_find_freq(rcg->freq_tbl, rate);
487 return __clk_rcg_set_rate(rcg, f);
490 static int clk_rcg_bypass_set_rate(struct clk_hw *hw, unsigned long rate,
491 unsigned long parent_rate)
493 struct clk_rcg *rcg = to_clk_rcg(hw);
495 return __clk_rcg_set_rate(rcg, rcg->freq_tbl);
498 static int __clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate)
500 struct clk_dyn_rcg *rcg = to_clk_dyn_rcg(hw);
501 const struct freq_tbl *f;
503 f = qcom_find_freq(rcg->freq_tbl, rate);
507 configure_bank(rcg, f);
512 static int clk_dyn_rcg_set_rate(struct clk_hw *hw, unsigned long rate,
513 unsigned long parent_rate)
515 return __clk_dyn_rcg_set_rate(hw, rate);
518 static int clk_dyn_rcg_set_rate_and_parent(struct clk_hw *hw,
519 unsigned long rate, unsigned long parent_rate, u8 index)
521 return __clk_dyn_rcg_set_rate(hw, rate);
524 const struct clk_ops clk_rcg_ops = {
525 .enable = clk_enable_regmap,
526 .disable = clk_disable_regmap,
527 .get_parent = clk_rcg_get_parent,
528 .set_parent = clk_rcg_set_parent,
529 .recalc_rate = clk_rcg_recalc_rate,
530 .determine_rate = clk_rcg_determine_rate,
531 .set_rate = clk_rcg_set_rate,
533 EXPORT_SYMBOL_GPL(clk_rcg_ops);
535 const struct clk_ops clk_rcg_bypass_ops = {
536 .enable = clk_enable_regmap,
537 .disable = clk_disable_regmap,
538 .get_parent = clk_rcg_get_parent,
539 .set_parent = clk_rcg_set_parent,
540 .recalc_rate = clk_rcg_recalc_rate,
541 .determine_rate = clk_rcg_bypass_determine_rate,
542 .set_rate = clk_rcg_bypass_set_rate,
544 EXPORT_SYMBOL_GPL(clk_rcg_bypass_ops);
546 const struct clk_ops clk_dyn_rcg_ops = {
547 .enable = clk_enable_regmap,
548 .is_enabled = clk_is_enabled_regmap,
549 .disable = clk_disable_regmap,
550 .get_parent = clk_dyn_rcg_get_parent,
551 .set_parent = clk_dyn_rcg_set_parent,
552 .recalc_rate = clk_dyn_rcg_recalc_rate,
553 .determine_rate = clk_dyn_rcg_determine_rate,
554 .set_rate = clk_dyn_rcg_set_rate,
555 .set_rate_and_parent = clk_dyn_rcg_set_rate_and_parent,
557 EXPORT_SYMBOL_GPL(clk_dyn_rcg_ops);