64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR MIT)
|
|
/*
|
|
* Copyright (c) 2018 BayLibre, SAS.
|
|
* Author: Jerome Brunet <jbrunet@baylibre.com>
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include "clkc.h"
|
|
|
|
#define phase_step(_width) (360 / (1 << (_width)))
|
|
|
|
static inline struct meson_clk_phase_data *
|
|
meson_clk_phase_data(struct clk_regmap *clk)
|
|
{
|
|
return (struct meson_clk_phase_data *)clk->data;
|
|
}
|
|
|
|
int meson_clk_degrees_from_val(unsigned int val, unsigned int width)
|
|
{
|
|
return phase_step(width) * val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(meson_clk_degrees_from_val);
|
|
|
|
unsigned int meson_clk_degrees_to_val(int degrees, unsigned int width)
|
|
{
|
|
unsigned int val = DIV_ROUND_CLOSEST(degrees, phase_step(width));
|
|
|
|
/*
|
|
* This last calculation is here for cases when degrees is rounded
|
|
* to 360, in which case val == (1 << width).
|
|
*/
|
|
return val % (1 << width);
|
|
}
|
|
EXPORT_SYMBOL_GPL(meson_clk_degrees_to_val);
|
|
|
|
static int meson_clk_phase_get_phase(struct clk_hw *hw)
|
|
{
|
|
struct clk_regmap *clk = to_clk_regmap(hw);
|
|
struct meson_clk_phase_data *phase = meson_clk_phase_data(clk);
|
|
unsigned int val;
|
|
|
|
val = meson_parm_read(clk->map, &phase->ph);
|
|
|
|
return meson_clk_degrees_from_val(val, phase->ph.width);
|
|
}
|
|
|
|
static int meson_clk_phase_set_phase(struct clk_hw *hw, int degrees)
|
|
{
|
|
struct clk_regmap *clk = to_clk_regmap(hw);
|
|
struct meson_clk_phase_data *phase = meson_clk_phase_data(clk);
|
|
unsigned int val;
|
|
|
|
val = meson_clk_degrees_to_val(degrees, phase->ph.width);
|
|
meson_parm_write(clk->map, &phase->ph, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct clk_ops meson_clk_phase_ops = {
|
|
.get_phase = meson_clk_phase_get_phase,
|
|
.set_phase = meson_clk_phase_set_phase,
|
|
};
|
|
EXPORT_SYMBOL_GPL(meson_clk_phase_ops);
|