mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 22:24:09 +08:00
b3ee3eff57
Add support for muxes that use regmap instead of readl/writel directly. We don't support as many features as clk-mux.c, but this is good enough to support getting and setting parents. Adding a table based lookup can be added in the future if needed. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Tested-by: Kenneth Westfield <kwestfie@codeaurora.org> Signed-off-by: Michael Turquette <mturquette@linaro.org>
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/*
|
|
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/export.h>
|
|
|
|
#include "clk-regmap-mux.h"
|
|
|
|
static inline struct clk_regmap_mux *to_clk_regmap_mux(struct clk_hw *hw)
|
|
{
|
|
return container_of(to_clk_regmap(hw), struct clk_regmap_mux, clkr);
|
|
}
|
|
|
|
static u8 mux_get_parent(struct clk_hw *hw)
|
|
{
|
|
struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
|
|
struct clk_regmap *clkr = to_clk_regmap(hw);
|
|
unsigned int mask = GENMASK(mux->width - 1, 0);
|
|
unsigned int val;
|
|
|
|
regmap_read(clkr->regmap, mux->reg, &val);
|
|
|
|
val >>= mux->shift;
|
|
val &= mask;
|
|
|
|
return val;
|
|
}
|
|
|
|
static int mux_set_parent(struct clk_hw *hw, u8 index)
|
|
{
|
|
struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
|
|
struct clk_regmap *clkr = to_clk_regmap(hw);
|
|
unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
|
|
unsigned int val;
|
|
|
|
val = index;
|
|
val <<= mux->shift;
|
|
|
|
return regmap_update_bits(clkr->regmap, mux->reg, mask, val);
|
|
}
|
|
|
|
const struct clk_ops clk_regmap_mux_closest_ops = {
|
|
.get_parent = mux_get_parent,
|
|
.set_parent = mux_set_parent,
|
|
.determine_rate = __clk_mux_determine_rate_closest,
|
|
};
|
|
EXPORT_SYMBOL_GPL(clk_regmap_mux_closest_ops);
|