Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
//
|
|
// OWL divider clock driver
|
|
//
|
|
// Copyright (c) 2014 Actions Semi Inc.
|
|
// Author: David Liu <liuwei@actions-semi.com>
|
|
//
|
|
// Copyright (c) 2018 Linaro Ltd.
|
|
// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "owl-divider.h"
|
|
|
|
long owl_divider_helper_round_rate(struct owl_clk_common *common,
|
|
const struct owl_divider_hw *div_hw,
|
|
unsigned long rate,
|
|
unsigned long *parent_rate)
|
|
{
|
|
return divider_round_rate(&common->hw, rate, parent_rate,
|
|
div_hw->table, div_hw->width,
|
|
div_hw->div_flags);
|
|
}
|
|
|
|
static int owl_divider_determine_rate(struct clk_hw *hw,
|
|
struct clk_rate_request *req)
|
|
{
|
|
struct owl_divider *div = hw_to_owl_divider(hw);
|
|
|
|
req->rate = owl_divider_helper_round_rate(&div->common, &div->div_hw,
|
|
req->rate,
|
|
&req->best_parent_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
unsigned long owl_divider_helper_recalc_rate(struct owl_clk_common *common,
|
|
const struct owl_divider_hw *div_hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
unsigned long val;
|
|
unsigned int reg;
|
|
|
|
regmap_read(common->regmap, div_hw->reg, ®);
|
|
val = reg >> div_hw->shift;
|
|
val &= (1 << div_hw->width) - 1;
|
|
|
|
return divider_recalc_rate(&common->hw, parent_rate,
|
|
val, div_hw->table,
|
|
div_hw->div_flags,
|
|
div_hw->width);
|
|
}
|
|
|
|
static unsigned long owl_divider_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct owl_divider *div = hw_to_owl_divider(hw);
|
|
|
|
return owl_divider_helper_recalc_rate(&div->common,
|
|
&div->div_hw, parent_rate);
|
|
}
|
|
|
|
int owl_divider_helper_set_rate(const struct owl_clk_common *common,
|
|
const struct owl_divider_hw *div_hw,
|
|
unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
unsigned long val;
|
|
unsigned int reg;
|
|
|
|
val = divider_get_val(rate, parent_rate, div_hw->table,
|
|
div_hw->width, 0);
|
|
|
|
regmap_read(common->regmap, div_hw->reg, ®);
|
|
reg &= ~GENMASK(div_hw->width + div_hw->shift - 1, div_hw->shift);
|
|
|
|
regmap_write(common->regmap, div_hw->reg,
|
|
reg | (val << div_hw->shift));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int owl_divider_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct owl_divider *div = hw_to_owl_divider(hw);
|
|
|
|
return owl_divider_helper_set_rate(&div->common, &div->div_hw,
|
|
rate, parent_rate);
|
|
}
|
|
|
|
const struct clk_ops owl_divider_ops = {
|
|
.recalc_rate = owl_divider_recalc_rate,
|
|
.determine_rate = owl_divider_determine_rate,
|
|
.set_rate = owl_divider_set_rate,
|
|
};
|