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Commit 4116076e authored by Josh Cartwright's avatar Josh Cartwright Committed by Michael Turquette
Browse files

clk: qcom: Add support for regmap divider clocks 



Add support for dividers that use regmap instead of readl/writel.

Signed-off-by: default avatarJosh Cartwright <joshc@codeaurora.org>
Signed-off-by: default avatarRajendra Nayak <rnayak@codeaurora.org>
[sboyd@codeaurora.org: Switch to using generic divider code, drop
enable/disable, reword commit text]
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 bca9690b

drivers/clk/qcom/Makefile

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



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

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

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+70 −0
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-divider.h"



static inline struct clk_regmap_div *to_clk_regmap_div(struct clk_hw *hw)

{

	return container_of(to_clk_regmap(hw), struct clk_regmap_div, clkr);

}



static long div_round_rate(struct clk_hw *hw, unsigned long rate,

			   unsigned long *prate)

{

	struct clk_regmap_div *divider = to_clk_regmap_div(hw);



	return divider_round_rate(hw, rate, prate, NULL, divider->width,

				  CLK_DIVIDER_ROUND_CLOSEST);

}



static int div_set_rate(struct clk_hw *hw, unsigned long rate,

			unsigned long parent_rate)

{

	struct clk_regmap_div *divider = to_clk_regmap_div(hw);

	struct clk_regmap *clkr = &divider->clkr;

	u32 div;



	div = divider_get_val(rate, parent_rate, NULL, divider->width,

			      CLK_DIVIDER_ROUND_CLOSEST);



	return regmap_update_bits(clkr->regmap, divider->reg,

				  (BIT(divider->width) - 1) << divider->shift,

				  div << divider->shift);

}



static unsigned long div_recalc_rate(struct clk_hw *hw,

				     unsigned long parent_rate)

{

	struct clk_regmap_div *divider = to_clk_regmap_div(hw);

	struct clk_regmap *clkr = &divider->clkr;

	u32 div;



	regmap_read(clkr->regmap, divider->reg, &div);

	div >>= divider->shift;

	div &= BIT(divider->width) - 1;



	return divider_recalc_rate(hw, parent_rate, div, NULL,

				   CLK_DIVIDER_ROUND_CLOSEST);

}



const struct clk_ops clk_regmap_div_ops = {

	.round_rate = div_round_rate,

	.set_rate = div_set_rate,

	.recalc_rate = div_recalc_rate,

};

EXPORT_SYMBOL_GPL(clk_regmap_div_ops);

drivers/clk/qcom/clk-regmap-divider.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_DIVIDER_H__

#define __QCOM_CLK_REGMAP_DIVIDER_H__



#include <linux/clk-provider.h>

#include "clk-regmap.h"



struct clk_regmap_div {

	u32			reg;

	u32			shift;

	u32			width;

	struct clk_regmap	clkr;

};



extern const struct clk_ops clk_regmap_div_ops;



#endif