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https://github.com/edk2-porting/linux-next.git
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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
/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/regmap.h>
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#include <linux/export.h>
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#include "clk-regmap-mux.h"
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static inline struct clk_regmap_mux *to_clk_regmap_mux(struct clk_hw *hw)
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{
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return container_of(to_clk_regmap(hw), struct clk_regmap_mux, clkr);
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}
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static u8 mux_get_parent(struct clk_hw *hw)
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{
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struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
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struct clk_regmap *clkr = to_clk_regmap(hw);
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unsigned int mask = GENMASK(mux->width - 1, 0);
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unsigned int val;
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regmap_read(clkr->regmap, mux->reg, &val);
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val >>= mux->shift;
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val &= mask;
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return val;
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}
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static int mux_set_parent(struct clk_hw *hw, u8 index)
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{
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struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
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struct clk_regmap *clkr = to_clk_regmap(hw);
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unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
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unsigned int val;
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val = index;
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val <<= mux->shift;
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return regmap_update_bits(clkr->regmap, mux->reg, mask, val);
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}
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const struct clk_ops clk_regmap_mux_closest_ops = {
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.get_parent = mux_get_parent,
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.set_parent = mux_set_parent,
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.determine_rate = __clk_mux_determine_rate_closest,
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};
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EXPORT_SYMBOL_GPL(clk_regmap_mux_closest_ops);
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