linux-stable/drivers/clk/qcom/clk-regmap-mux.c
Stephen Boyd b3ee3eff57 clk: qcom: Add simple regmap based muxes
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>
2015-01-27 11:49:09 -08:00

59 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);