Commit b3ee3eff authored by Stephen Boyd's avatar Stephen Boyd Committed by Michael Turquette
Browse files

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: default avatarStephen Boyd <sboyd@codeaurora.org>
Tested-by: default avatarKenneth Westfield <kwestfie@codeaurora.org>
Signed-off-by: default avatarMichael Turquette <mturquette@linaro.org>
parent 4116076e

drivers/clk/qcom/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -7,6 +7,7 @@ clk-qcom-y += clk-rcg.o 
clk-qcom-y += clk-rcg2.o

clk-qcom-y += clk-branch.o

clk-qcom-y += clk-regmap-divider.o

clk-qcom-y += clk-regmap-mux.o

clk-qcom-y += reset.o



obj-$(CONFIG_APQ_GCC_8084) += gcc-apq8084.o

drivers/clk/qcom/clk-regmap-mux.c

0 → 100644
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Original line number Diff line number Diff line 
/*

 * 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);

drivers/clk/qcom/clk-regmap-mux.h

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Original line number Diff line number Diff line 
/*

 * 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.

 */



#ifndef __QCOM_CLK_REGMAP_MUX_H__

#define __QCOM_CLK_REGMAP_MUX_H__



#include <linux/clk-provider.h>

#include "clk-regmap.h"



struct clk_regmap_mux {

	u32			reg;

	u32			shift;

	u32			width;

	struct clk_regmap	clkr;

};



extern const struct clk_ops clk_regmap_mux_closest_ops;



#endif

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