drivers/clk/clk-composite.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2013 NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/err.h>
 #include <linux/slab.h>

 #define to_clk_composite(_hw) container_of(_hw, struct clk_composite, hw)

 static u8 clk_composite_get_parent(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *mux_ops = composite->mux_ops;
 	struct clk_hw *mux_hw = composite->mux_hw;

 	__clk_hw_set_clk(mux_hw, hw);

 	return mux_ops->get_parent(mux_hw);
 }

 static int clk_composite_set_parent(struct clk_hw *hw, u8 index)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *mux_ops = composite->mux_ops;
 	struct clk_hw *mux_hw = composite->mux_hw;

 	__clk_hw_set_clk(mux_hw, hw);

 	return mux_ops->set_parent(mux_hw, index);
 }

 static unsigned long clk_composite_recalc_rate(struct clk_hw *hw,
 					    unsigned long parent_rate)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;

 	__clk_hw_set_clk(rate_hw, hw);

 	return rate_ops->recalc_rate(rate_hw, parent_rate);
 }

 static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate,
 					unsigned long min_rate,
 					unsigned long max_rate,
 					unsigned long *best_parent_rate,
 					struct clk_hw **best_parent_p)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	const struct clk_ops *mux_ops = composite->mux_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;
 	struct clk_hw *mux_hw = composite->mux_hw;
 	struct clk *parent;
 	unsigned long parent_rate;
 	long tmp_rate, best_rate = 0;
 	unsigned long rate_diff;
 	unsigned long best_rate_diff = ULONG_MAX;
 	int i;

 	if (rate_hw && rate_ops && rate_ops->determine_rate) {
 		__clk_hw_set_clk(rate_hw, hw);
 		return rate_ops->determine_rate(rate_hw, rate, min_rate,
 						max_rate,
 						best_parent_rate,
 						best_parent_p);
 	} else if (rate_hw && rate_ops && rate_ops->round_rate &&
 		   mux_hw && mux_ops && mux_ops->set_parent) {
 		*best_parent_p = NULL;

 		if (__clk_get_flags(hw->clk) & CLK_SET_RATE_NO_REPARENT) {
 			parent = clk_get_parent(mux_hw->clk);
 			*best_parent_p = __clk_get_hw(parent);
 			*best_parent_rate = __clk_get_rate(parent);

 			return rate_ops->round_rate(rate_hw, rate,
 						    best_parent_rate);
 		}

 		for (i = 0; i < __clk_get_num_parents(mux_hw->clk); i++) {
 			parent = clk_get_parent_by_index(mux_hw->clk, i);
 			if (!parent)
 				continue;

 			parent_rate = __clk_get_rate(parent);

 			tmp_rate = rate_ops->round_rate(rate_hw, rate,
 							&parent_rate);
 			if (tmp_rate < 0)
 				continue;

 			rate_diff = abs(rate - tmp_rate);

 			if (!rate_diff || !*best_parent_p
 				       || best_rate_diff > rate_diff) {
 				*best_parent_p = __clk_get_hw(parent);
 				*best_parent_rate = parent_rate;
 				best_rate_diff = rate_diff;
 				best_rate = tmp_rate;
 			}

 			if (!rate_diff)
 				return rate;
 		}

 		return best_rate;
 	} else if (mux_hw && mux_ops && mux_ops->determine_rate) {
 		__clk_hw_set_clk(mux_hw, hw);
 		return mux_ops->determine_rate(mux_hw, rate, min_rate,
 					       max_rate, best_parent_rate,
 					       best_parent_p);
 	} else {
 		pr_err("clk: clk_composite_determine_rate function called, but no mux or rate callback set!\n");
 		return 0;
 	}
 }

 static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate,
 				  unsigned long *prate)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;

 	__clk_hw_set_clk(rate_hw, hw);

 	return rate_ops->round_rate(rate_hw, rate, prate);
 }

 static int clk_composite_set_rate(struct clk_hw *hw, unsigned long rate,
 			       unsigned long parent_rate)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;

 	__clk_hw_set_clk(rate_hw, hw);

 	return rate_ops->set_rate(rate_hw, rate, parent_rate);
 }

 static int clk_composite_is_enabled(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *gate_ops = composite->gate_ops;
 	struct clk_hw *gate_hw = composite->gate_hw;

 	__clk_hw_set_clk(gate_hw, hw);

 	return gate_ops->is_enabled(gate_hw);
 }

 static int clk_composite_enable(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *gate_ops = composite->gate_ops;
 	struct clk_hw *gate_hw = composite->gate_hw;

 	__clk_hw_set_clk(gate_hw, hw);

 	return gate_ops->enable(gate_hw);
 }

 static void clk_composite_disable(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *gate_ops = composite->gate_ops;
 	struct clk_hw *gate_hw = composite->gate_hw;

 	__clk_hw_set_clk(gate_hw, hw);

 	gate_ops->disable(gate_hw);
 }

 struct clk *clk_register_composite(struct device *dev, const char *name,
 			const char **parent_names, int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
 			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 			unsigned long flags)
 {
 	struct clk *clk;
 	struct clk_init_data init;
 	struct clk_composite *composite;
 	struct clk_ops *clk_composite_ops;

 	composite = kzalloc(sizeof(*composite), GFP_KERNEL);
 	if (!composite) {
 		pr_err("%s: could not allocate composite clk\n", __func__);
 		return ERR_PTR(-ENOMEM);
 	}

 	init.name = name;
 	init.flags = flags | CLK_IS_BASIC;
 	init.parent_names = parent_names;
 	init.num_parents = num_parents;

 	clk_composite_ops = &composite->ops;

 	if (mux_hw && mux_ops) {
 		if (!mux_ops->get_parent) {
 			clk = ERR_PTR(-EINVAL);
 			goto err;
 		}

 		composite->mux_hw = mux_hw;
 		composite->mux_ops = mux_ops;
 		clk_composite_ops->get_parent = clk_composite_get_parent;
 		if (mux_ops->set_parent)
 			clk_composite_ops->set_parent = clk_composite_set_parent;
 		if (mux_ops->determine_rate)
 			clk_composite_ops->determine_rate = clk_composite_determine_rate;
 	}

 	if (rate_hw && rate_ops) {
 		if (!rate_ops->recalc_rate) {
 			clk = ERR_PTR(-EINVAL);
 			goto err;
 		}
 		clk_composite_ops->recalc_rate = clk_composite_recalc_rate;

 		if (rate_ops->determine_rate)
 			clk_composite_ops->determine_rate =
 				clk_composite_determine_rate;
 		else if (rate_ops->round_rate)
 			clk_composite_ops->round_rate =
 				clk_composite_round_rate;

 		/* .set_rate requires either .round_rate or .determine_rate */
 		if (rate_ops->set_rate) {
 			if (rate_ops->determine_rate || rate_ops->round_rate)
 				clk_composite_ops->set_rate =
 						clk_composite_set_rate;
 			else
 				WARN(1, "%s: missing round_rate op is required\n",
 						__func__);
 		}

 		composite->rate_hw = rate_hw;
 		composite->rate_ops = rate_ops;
 	}

 	if (gate_hw && gate_ops) {
 		if (!gate_ops->is_enabled || !gate_ops->enable ||
 		    !gate_ops->disable) {
 			clk = ERR_PTR(-EINVAL);
 			goto err;
 		}

 		composite->gate_hw = gate_hw;
 		composite->gate_ops = gate_ops;
 		clk_composite_ops->is_enabled = clk_composite_is_enabled;
 		clk_composite_ops->enable = clk_composite_enable;
 		clk_composite_ops->disable = clk_composite_disable;
 	}

 	init.ops = clk_composite_ops;
 	composite->hw.init = &init;

 	clk = clk_register(dev, &composite->hw);
 	if (IS_ERR(clk))
 		goto err;

 	if (composite->mux_hw)
 		composite->mux_hw->clk = clk;

 	if (composite->rate_hw)
 		composite->rate_hw->clk = clk;

 	if (composite->gate_hw)
 		composite->gate_hw->clk = clk;

 	return clk;

 err:
 	kfree(composite);
 	return clk;
 }
	/*
	* Copyright (c) 2013 NVIDIA CORPORATION. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/clk.h>
	#include <linux/clk-provider.h>
	#include <linux/err.h>
	#include <linux/slab.h>

	#define to_clk_composite(_hw) container_of(_hw, struct clk_composite, hw)

	static u8 clk_composite_get_parent(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *mux_ops = composite->mux_ops;
	struct clk_hw *mux_hw = composite->mux_hw;

	__clk_hw_set_clk(mux_hw, hw);

	return mux_ops->get_parent(mux_hw);
	}

	static int clk_composite_set_parent(struct clk_hw *hw, u8 index)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *mux_ops = composite->mux_ops;
	struct clk_hw *mux_hw = composite->mux_hw;

	__clk_hw_set_clk(mux_hw, hw);

	return mux_ops->set_parent(mux_hw, index);
	}

	static unsigned long clk_composite_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	struct clk_hw *rate_hw = composite->rate_hw;

	__clk_hw_set_clk(rate_hw, hw);

	return rate_ops->recalc_rate(rate_hw, parent_rate);
	}

	static long clk_composite_determine_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long min_rate,
	unsigned long max_rate,
	unsigned long *best_parent_rate,
	struct clk_hw **best_parent_p)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	const struct clk_ops *mux_ops = composite->mux_ops;
	struct clk_hw *rate_hw = composite->rate_hw;
	struct clk_hw *mux_hw = composite->mux_hw;
	struct clk *parent;
	unsigned long parent_rate;
	long tmp_rate, best_rate = 0;
	unsigned long rate_diff;
	unsigned long best_rate_diff = ULONG_MAX;
	int i;

	if (rate_hw && rate_ops && rate_ops->determine_rate) {
	__clk_hw_set_clk(rate_hw, hw);
	return rate_ops->determine_rate(rate_hw, rate, min_rate,
	max_rate,
	best_parent_rate,
	best_parent_p);
	} else if (rate_hw && rate_ops && rate_ops->round_rate &&
	mux_hw && mux_ops && mux_ops->set_parent) {
	*best_parent_p = NULL;

	if (__clk_get_flags(hw->clk) & CLK_SET_RATE_NO_REPARENT) {
	parent = clk_get_parent(mux_hw->clk);
	*best_parent_p = __clk_get_hw(parent);
	*best_parent_rate = __clk_get_rate(parent);

	return rate_ops->round_rate(rate_hw, rate,
	best_parent_rate);
	}

	for (i = 0; i < __clk_get_num_parents(mux_hw->clk); i++) {
	parent = clk_get_parent_by_index(mux_hw->clk, i);
	if (!parent)
	continue;

	parent_rate = __clk_get_rate(parent);

	tmp_rate = rate_ops->round_rate(rate_hw, rate,
	&parent_rate);
	if (tmp_rate < 0)
	continue;

	rate_diff = abs(rate - tmp_rate);

	if (!rate_diff \|\| !*best_parent_p
	\|\| best_rate_diff > rate_diff) {
	*best_parent_p = __clk_get_hw(parent);
	*best_parent_rate = parent_rate;
	best_rate_diff = rate_diff;
	best_rate = tmp_rate;
	}

	if (!rate_diff)
	return rate;
	}

	return best_rate;
	} else if (mux_hw && mux_ops && mux_ops->determine_rate) {
	__clk_hw_set_clk(mux_hw, hw);
	return mux_ops->determine_rate(mux_hw, rate, min_rate,
	max_rate, best_parent_rate,
	best_parent_p);
	} else {
	pr_err("clk: clk_composite_determine_rate function called, but no mux or rate callback set!\n");
	return 0;
	}
	}

	static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long *prate)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	struct clk_hw *rate_hw = composite->rate_hw;

	__clk_hw_set_clk(rate_hw, hw);

	return rate_ops->round_rate(rate_hw, rate, prate);
	}

	static int clk_composite_set_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long parent_rate)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	struct clk_hw *rate_hw = composite->rate_hw;

	__clk_hw_set_clk(rate_hw, hw);

	return rate_ops->set_rate(rate_hw, rate, parent_rate);
	}

	static int clk_composite_is_enabled(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *gate_ops = composite->gate_ops;
	struct clk_hw *gate_hw = composite->gate_hw;

	__clk_hw_set_clk(gate_hw, hw);

	return gate_ops->is_enabled(gate_hw);
	}

	static int clk_composite_enable(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *gate_ops = composite->gate_ops;
	struct clk_hw *gate_hw = composite->gate_hw;

	__clk_hw_set_clk(gate_hw, hw);

	return gate_ops->enable(gate_hw);
	}

	static void clk_composite_disable(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *gate_ops = composite->gate_ops;
	struct clk_hw *gate_hw = composite->gate_hw;

	__clk_hw_set_clk(gate_hw, hw);

	gate_ops->disable(gate_hw);
	}

	struct clk clk_register_composite(struct device dev, const char *name,
	const char **parent_names, int num_parents,
	struct clk_hw mux_hw, const struct clk_ops mux_ops,
	struct clk_hw rate_hw, const struct clk_ops rate_ops,
	struct clk_hw gate_hw, const struct clk_ops gate_ops,
	unsigned long flags)
	{
	struct clk *clk;
	struct clk_init_data init;
	struct clk_composite *composite;
	struct clk_ops *clk_composite_ops;

	composite = kzalloc(sizeof(*composite), GFP_KERNEL);
	if (!composite) {
	pr_err("%s: could not allocate composite clk\n", __func__);
	return ERR_PTR(-ENOMEM);
	}

	init.name = name;
	init.flags = flags \| CLK_IS_BASIC;
	init.parent_names = parent_names;
	init.num_parents = num_parents;

	clk_composite_ops = &composite->ops;

	if (mux_hw && mux_ops) {
	if (!mux_ops->get_parent) {
	clk = ERR_PTR(-EINVAL);
	goto err;
	}

	composite->mux_hw = mux_hw;
	composite->mux_ops = mux_ops;
	clk_composite_ops->get_parent = clk_composite_get_parent;
	if (mux_ops->set_parent)
	clk_composite_ops->set_parent = clk_composite_set_parent;
	if (mux_ops->determine_rate)
	clk_composite_ops->determine_rate = clk_composite_determine_rate;
	}

	if (rate_hw && rate_ops) {
	if (!rate_ops->recalc_rate) {
	clk = ERR_PTR(-EINVAL);
	goto err;
	}
	clk_composite_ops->recalc_rate = clk_composite_recalc_rate;

	if (rate_ops->determine_rate)
	clk_composite_ops->determine_rate =
	clk_composite_determine_rate;
	else if (rate_ops->round_rate)
	clk_composite_ops->round_rate =
	clk_composite_round_rate;

	/* .set_rate requires either .round_rate or .determine_rate */
	if (rate_ops->set_rate) {
	if (rate_ops->determine_rate \|\| rate_ops->round_rate)
	clk_composite_ops->set_rate =
	clk_composite_set_rate;
	else
	WARN(1, "%s: missing round_rate op is required\n",
	__func__);
	}

	composite->rate_hw = rate_hw;
	composite->rate_ops = rate_ops;
	}

	if (gate_hw && gate_ops) {
	if (!gate_ops->is_enabled \|\| !gate_ops->enable \|\|
	!gate_ops->disable) {
	clk = ERR_PTR(-EINVAL);
	goto err;
	}

	composite->gate_hw = gate_hw;
	composite->gate_ops = gate_ops;
	clk_composite_ops->is_enabled = clk_composite_is_enabled;
	clk_composite_ops->enable = clk_composite_enable;
	clk_composite_ops->disable = clk_composite_disable;
	}

	init.ops = clk_composite_ops;
	composite->hw.init = &init;

	clk = clk_register(dev, &composite->hw);
	if (IS_ERR(clk))
	goto err;

	if (composite->mux_hw)
	composite->mux_hw->clk = clk;

	if (composite->rate_hw)
	composite->rate_hw->clk = clk;

	if (composite->gate_hw)
	composite->gate_hw->clk = clk;

	return clk;

	err:
	kfree(composite);
	return clk;
	}