1 // SPDX-License-Identifier: (GPL-2.0 OR MIT)
2 /*
3 * Copyright (c) 2018 BayLibre, SAS.
4 * Author: Jerome Brunet <jbrunet@baylibre.com>
5 */
6
7 #include <linux/clk-provider.h>
8 #include "clkc.h"
9
10 #define phase_step(_width) (360 / (1 << (_width)))
11
12 static inline struct meson_clk_phase_data *
meson_clk_phase_data(struct clk_regmap * clk)13 meson_clk_phase_data(struct clk_regmap *clk)
14 {
15 return (struct meson_clk_phase_data *)clk->data;
16 }
17
meson_clk_degrees_from_val(unsigned int val,unsigned int width)18 int meson_clk_degrees_from_val(unsigned int val, unsigned int width)
19 {
20 return phase_step(width) * val;
21 }
22 EXPORT_SYMBOL_GPL(meson_clk_degrees_from_val);
23
meson_clk_degrees_to_val(int degrees,unsigned int width)24 unsigned int meson_clk_degrees_to_val(int degrees, unsigned int width)
25 {
26 unsigned int val = DIV_ROUND_CLOSEST(degrees, phase_step(width));
27
28 /*
29 * This last calculation is here for cases when degrees is rounded
30 * to 360, in which case val == (1 << width).
31 */
32 return val % (1 << width);
33 }
34 EXPORT_SYMBOL_GPL(meson_clk_degrees_to_val);
35
meson_clk_phase_get_phase(struct clk_hw * hw)36 static int meson_clk_phase_get_phase(struct clk_hw *hw)
37 {
38 struct clk_regmap *clk = to_clk_regmap(hw);
39 struct meson_clk_phase_data *phase = meson_clk_phase_data(clk);
40 unsigned int val;
41
42 val = meson_parm_read(clk->map, &phase->ph);
43
44 return meson_clk_degrees_from_val(val, phase->ph.width);
45 }
46
meson_clk_phase_set_phase(struct clk_hw * hw,int degrees)47 static int meson_clk_phase_set_phase(struct clk_hw *hw, int degrees)
48 {
49 struct clk_regmap *clk = to_clk_regmap(hw);
50 struct meson_clk_phase_data *phase = meson_clk_phase_data(clk);
51 unsigned int val;
52
53 val = meson_clk_degrees_to_val(degrees, phase->ph.width);
54 meson_parm_write(clk->map, &phase->ph, val);
55
56 return 0;
57 }
58
59 const struct clk_ops meson_clk_phase_ops = {
60 .get_phase = meson_clk_phase_get_phase,
61 .set_phase = meson_clk_phase_set_phase,
62 };
63 EXPORT_SYMBOL_GPL(meson_clk_phase_ops);
64