drivers/clk/samsung/clk.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Copyright (c) 2013 Samsung Electronics Co., Ltd.
  * Copyright (c) 2013 Linaro Ltd.
  * Author: Thomas Abraham <thomas.ab@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * This file includes utility functions to register clocks to common
  * clock framework for Samsung platforms.
 */

 #include <linux/syscore_ops.h>
 #include "clk.h"

 void samsung_clk_save(void __iomem *base,
 				    struct samsung_clk_reg_dump *rd,
 				    unsigned int num_regs)
 {
 	for (; num_regs > 0; --num_regs, ++rd)
 		rd->value = readl(base + rd->offset);
 }

 void samsung_clk_restore(void __iomem *base,
 				      const struct samsung_clk_reg_dump *rd,
 				      unsigned int num_regs)
 {
 	for (; num_regs > 0; --num_regs, ++rd)
 		writel(rd->value, base + rd->offset);
 }

 struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(
 						const unsigned long *rdump,
 						unsigned long nr_rdump)
 {
 	struct samsung_clk_reg_dump *rd;
 	unsigned int i;

 	rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);
 	if (!rd)
 		return NULL;

 	for (i = 0; i < nr_rdump; ++i)
 		rd[i].offset = rdump[i];

 	return rd;
 }

 /* setup the essentials required to support clock lookup using ccf */
 struct samsung_clk_provider *__init samsung_clk_init(struct device_node *np,
 			void __iomem *base, unsigned long nr_clks)
 {
 	struct samsung_clk_provider *ctx;
 	struct clk **clk_table;
 	int ret;
 	int i;

 	ctx = kzalloc(sizeof(struct samsung_clk_provider), GFP_KERNEL);
 	if (!ctx)
 		panic("could not allocate clock provider context.\n");

 	clk_table = kcalloc(nr_clks, sizeof(struct clk *), GFP_KERNEL);
 	if (!clk_table)
 		panic("could not allocate clock lookup table\n");

 	for (i = 0; i < nr_clks; ++i)
 		clk_table[i] = ERR_PTR(-ENOENT);

 	ctx->reg_base = base;
 	ctx->clk_data.clks = clk_table;
 	ctx->clk_data.clk_num = nr_clks;
 	spin_lock_init(&ctx->lock);

 	if (!np)
 		return ctx;

 	ret = of_clk_add_provider(np, of_clk_src_onecell_get,
 			&ctx->clk_data);
 	if (ret)
 		panic("could not register clock provide\n");

 	return ctx;
 }

 /* add a clock instance to the clock lookup table used for dt based lookup */
 void samsung_clk_add_lookup(struct samsung_clk_provider *ctx, struct clk *clk,
 				unsigned int id)
 {
 	if (ctx->clk_data.clks && id)
 		ctx->clk_data.clks[id] = clk;
 }

 /* register a list of aliases */
 void __init samsung_clk_register_alias(struct samsung_clk_provider *ctx,
 				struct samsung_clock_alias *list,
 				unsigned int nr_clk)
 {
 	struct clk *clk;
 	unsigned int idx, ret;

 	if (!ctx->clk_data.clks) {
 		pr_err("%s: clock table missing\n", __func__);
 		return;
 	}

 	for (idx = 0; idx < nr_clk; idx++, list++) {
 		if (!list->id) {
 			pr_err("%s: clock id missing for index %d\n", __func__,
 				idx);
 			continue;
 		}

 		clk = ctx->clk_data.clks[list->id];
 		if (!clk) {
 			pr_err("%s: failed to find clock %d\n", __func__,
 				list->id);
 			continue;
 		}

 		ret = clk_register_clkdev(clk, list->alias, list->dev_name);
 		if (ret)
 			pr_err("%s: failed to register lookup %s\n",
 					__func__, list->alias);
 	}
 }

 /* register a list of fixed clocks */
 void __init samsung_clk_register_fixed_rate(struct samsung_clk_provider *ctx,
 		struct samsung_fixed_rate_clock *list, unsigned int nr_clk)
 {
 	struct clk *clk;
 	unsigned int idx, ret;

 	for (idx = 0; idx < nr_clk; idx++, list++) {
 		clk = clk_register_fixed_rate(NULL, list->name,
 			list->parent_name, list->flags, list->fixed_rate);
 		if (IS_ERR(clk)) {
 			pr_err("%s: failed to register clock %s\n", __func__,
 				list->name);
 			continue;
 		}

 		samsung_clk_add_lookup(ctx, clk, list->id);

 		/*
 		 * Unconditionally add a clock lookup for the fixed rate clocks.
 		 * There are not many of these on any of Samsung platforms.
 		 */
 		ret = clk_register_clkdev(clk, list->name, NULL);
 		if (ret)
 			pr_err("%s: failed to register clock lookup for %s",
 				__func__, list->name);
 	}
 }

 /* register a list of fixed factor clocks */
 void __init samsung_clk_register_fixed_factor(struct samsung_clk_provider *ctx,
 		struct samsung_fixed_factor_clock *list, unsigned int nr_clk)
 {
 	struct clk *clk;
 	unsigned int idx;

 	for (idx = 0; idx < nr_clk; idx++, list++) {
 		clk = clk_register_fixed_factor(NULL, list->name,
 			list->parent_name, list->flags, list->mult, list->div);
 		if (IS_ERR(clk)) {
 			pr_err("%s: failed to register clock %s\n", __func__,
 				list->name);
 			continue;
 		}

 		samsung_clk_add_lookup(ctx, clk, list->id);
 	}
 }

 /* register a list of mux clocks */
 void __init samsung_clk_register_mux(struct samsung_clk_provider *ctx,
 				struct samsung_mux_clock *list,
 				unsigned int nr_clk)
 {
 	struct clk *clk;
 	unsigned int idx, ret;

 	for (idx = 0; idx < nr_clk; idx++, list++) {
 		clk = clk_register_mux(NULL, list->name, list->parent_names,
 			list->num_parents, list->flags,
 			ctx->reg_base + list->offset,
 			list->shift, list->width, list->mux_flags, &ctx->lock);
 		if (IS_ERR(clk)) {
 			pr_err("%s: failed to register clock %s\n", __func__,
 				list->name);
 			continue;
 		}

 		samsung_clk_add_lookup(ctx, clk, list->id);

 		/* register a clock lookup only if a clock alias is specified */
 		if (list->alias) {
 			ret = clk_register_clkdev(clk, list->alias,
 						list->dev_name);
 			if (ret)
 				pr_err("%s: failed to register lookup %s\n",
 						__func__, list->alias);
 		}
 	}
 }

 /* register a list of div clocks */
 void __init samsung_clk_register_div(struct samsung_clk_provider *ctx,
 				struct samsung_div_clock *list,
 				unsigned int nr_clk)
 {
 	struct clk *clk;
 	unsigned int idx, ret;

 	for (idx = 0; idx < nr_clk; idx++, list++) {
 		if (list->table)
 			clk = clk_register_divider_table(NULL, list->name,
 				list->parent_name, list->flags,
 				ctx->reg_base + list->offset,
 				list->shift, list->width, list->div_flags,
 				list->table, &ctx->lock);
 		else
 			clk = clk_register_divider(NULL, list->name,
 				list->parent_name, list->flags,
 				ctx->reg_base + list->offset, list->shift,
 				list->width, list->div_flags, &ctx->lock);
 		if (IS_ERR(clk)) {
 			pr_err("%s: failed to register clock %s\n", __func__,
 				list->name);
 			continue;
 		}

 		samsung_clk_add_lookup(ctx, clk, list->id);

 		/* register a clock lookup only if a clock alias is specified */
 		if (list->alias) {
 			ret = clk_register_clkdev(clk, list->alias,
 						list->dev_name);
 			if (ret)
 				pr_err("%s: failed to register lookup %s\n",
 						__func__, list->alias);
 		}
 	}
 }

 /* register a list of gate clocks */
 void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
 				struct samsung_gate_clock *list,
 				unsigned int nr_clk)
 {
 	struct clk *clk;
 	unsigned int idx, ret;

 	for (idx = 0; idx < nr_clk; idx++, list++) {
 		clk = clk_register_gate(NULL, list->name, list->parent_name,
 				list->flags, ctx->reg_base + list->offset,
 				list->bit_idx, list->gate_flags, &ctx->lock);
 		if (IS_ERR(clk)) {
 			pr_err("%s: failed to register clock %s\n", __func__,
 				list->name);
 			continue;
 		}

 		/* register a clock lookup only if a clock alias is specified */
 		if (list->alias) {
 			ret = clk_register_clkdev(clk, list->alias,
 							list->dev_name);
 			if (ret)
 				pr_err("%s: failed to register lookup %s\n",
 					__func__, list->alias);
 		}

 		samsung_clk_add_lookup(ctx, clk, list->id);
 	}
 }

 /*
  * obtain the clock speed of all external fixed clock sources from device
  * tree and register it
  */
 #ifdef CONFIG_OF
 void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
 			struct samsung_fixed_rate_clock *fixed_rate_clk,
 			unsigned int nr_fixed_rate_clk,
 			struct of_device_id *clk_matches)
 {
 	const struct of_device_id *match;
 	struct device_node *clk_np;
 	u32 freq;

 	for_each_matching_node_and_match(clk_np, clk_matches, &match) {
 		if (of_property_read_u32(clk_np, "clock-frequency", &freq))
 			continue;
 		fixed_rate_clk[(unsigned long)match->data].fixed_rate = freq;
 	}
 	samsung_clk_register_fixed_rate(ctx, fixed_rate_clk, nr_fixed_rate_clk);
 }
 #endif

 /* utility function to get the rate of a specified clock */
 unsigned long _get_rate(const char *clk_name)
 {
 	struct clk *clk;

 	clk = __clk_lookup(clk_name);
 	if (!clk) {
 		pr_err("%s: could not find clock %s\n", __func__, clk_name);
 		return 0;
 	}

 	return clk_get_rate(clk);
 }
	/*
	* Copyright (c) 2013 Samsung Electronics Co., Ltd.
	* Copyright (c) 2013 Linaro Ltd.
	* Author: Thomas Abraham <thomas.ab@samsung.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* This file includes utility functions to register clocks to common
	* clock framework for Samsung platforms.
	*/

	#include <linux/syscore_ops.h>
	#include "clk.h"

	void samsung_clk_save(void __iomem *base,
	struct samsung_clk_reg_dump *rd,
	unsigned int num_regs)
	{
	for (; num_regs > 0; --num_regs, ++rd)
	rd->value = readl(base + rd->offset);
	}

	void samsung_clk_restore(void __iomem *base,
	const struct samsung_clk_reg_dump *rd,
	unsigned int num_regs)
	{
	for (; num_regs > 0; --num_regs, ++rd)
	writel(rd->value, base + rd->offset);
	}

	struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(
	const unsigned long *rdump,
	unsigned long nr_rdump)
	{
	struct samsung_clk_reg_dump *rd;
	unsigned int i;

	rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);
	if (!rd)
	return NULL;

	for (i = 0; i < nr_rdump; ++i)
	rd[i].offset = rdump[i];

	return rd;
	}

	/* setup the essentials required to support clock lookup using ccf */
	struct samsung_clk_provider __init samsung_clk_init(struct device_node np,
	void __iomem *base, unsigned long nr_clks)
	{
	struct samsung_clk_provider *ctx;
	struct clk **clk_table;
	int ret;
	int i;

	ctx = kzalloc(sizeof(struct samsung_clk_provider), GFP_KERNEL);
	if (!ctx)
	panic("could not allocate clock provider context.\n");

	clk_table = kcalloc(nr_clks, sizeof(struct clk *), GFP_KERNEL);
	if (!clk_table)
	panic("could not allocate clock lookup table\n");

	for (i = 0; i < nr_clks; ++i)
	clk_table[i] = ERR_PTR(-ENOENT);

	ctx->reg_base = base;
	ctx->clk_data.clks = clk_table;
	ctx->clk_data.clk_num = nr_clks;
	spin_lock_init(&ctx->lock);

	if (!np)
	return ctx;

	ret = of_clk_add_provider(np, of_clk_src_onecell_get,
	&ctx->clk_data);
	if (ret)
	panic("could not register clock provide\n");

	return ctx;
	}

	/* add a clock instance to the clock lookup table used for dt based lookup */
	void samsung_clk_add_lookup(struct samsung_clk_provider ctx, struct clk clk,
	unsigned int id)
	{
	if (ctx->clk_data.clks && id)
	ctx->clk_data.clks[id] = clk;
	}

	/* register a list of aliases */
	void __init samsung_clk_register_alias(struct samsung_clk_provider *ctx,
	struct samsung_clock_alias *list,
	unsigned int nr_clk)
	{
	struct clk *clk;
	unsigned int idx, ret;

	if (!ctx->clk_data.clks) {
	pr_err("%s: clock table missing\n", __func__);
	return;
	}

	for (idx = 0; idx < nr_clk; idx++, list++) {
	if (!list->id) {
	pr_err("%s: clock id missing for index %d\n", __func__,
	idx);
	continue;
	}

	clk = ctx->clk_data.clks[list->id];
	if (!clk) {
	pr_err("%s: failed to find clock %d\n", __func__,
	list->id);
	continue;
	}

	ret = clk_register_clkdev(clk, list->alias, list->dev_name);
	if (ret)
	pr_err("%s: failed to register lookup %s\n",
	__func__, list->alias);
	}
	}

	/* register a list of fixed clocks */
	void __init samsung_clk_register_fixed_rate(struct samsung_clk_provider *ctx,
	struct samsung_fixed_rate_clock *list, unsigned int nr_clk)
	{
	struct clk *clk;
	unsigned int idx, ret;

	for (idx = 0; idx < nr_clk; idx++, list++) {
	clk = clk_register_fixed_rate(NULL, list->name,
	list->parent_name, list->flags, list->fixed_rate);
	if (IS_ERR(clk)) {
	pr_err("%s: failed to register clock %s\n", __func__,
	list->name);
	continue;
	}

	samsung_clk_add_lookup(ctx, clk, list->id);

	/*
	* Unconditionally add a clock lookup for the fixed rate clocks.
	* There are not many of these on any of Samsung platforms.
	*/
	ret = clk_register_clkdev(clk, list->name, NULL);
	if (ret)
	pr_err("%s: failed to register clock lookup for %s",
	__func__, list->name);
	}
	}

	/* register a list of fixed factor clocks */
	void __init samsung_clk_register_fixed_factor(struct samsung_clk_provider *ctx,
	struct samsung_fixed_factor_clock *list, unsigned int nr_clk)
	{
	struct clk *clk;
	unsigned int idx;

	for (idx = 0; idx < nr_clk; idx++, list++) {
	clk = clk_register_fixed_factor(NULL, list->name,
	list->parent_name, list->flags, list->mult, list->div);
	if (IS_ERR(clk)) {
	pr_err("%s: failed to register clock %s\n", __func__,
	list->name);
	continue;
	}

	samsung_clk_add_lookup(ctx, clk, list->id);
	}
	}

	/* register a list of mux clocks */
	void __init samsung_clk_register_mux(struct samsung_clk_provider *ctx,
	struct samsung_mux_clock *list,
	unsigned int nr_clk)
	{
	struct clk *clk;
	unsigned int idx, ret;

	for (idx = 0; idx < nr_clk; idx++, list++) {
	clk = clk_register_mux(NULL, list->name, list->parent_names,
	list->num_parents, list->flags,
	ctx->reg_base + list->offset,
	list->shift, list->width, list->mux_flags, &ctx->lock);
	if (IS_ERR(clk)) {
	pr_err("%s: failed to register clock %s\n", __func__,
	list->name);
	continue;
	}

	samsung_clk_add_lookup(ctx, clk, list->id);

	/* register a clock lookup only if a clock alias is specified */
	if (list->alias) {
	ret = clk_register_clkdev(clk, list->alias,
	list->dev_name);
	if (ret)
	pr_err("%s: failed to register lookup %s\n",
	__func__, list->alias);
	}
	}
	}

	/* register a list of div clocks */
	void __init samsung_clk_register_div(struct samsung_clk_provider *ctx,
	struct samsung_div_clock *list,
	unsigned int nr_clk)
	{
	struct clk *clk;
	unsigned int idx, ret;

	for (idx = 0; idx < nr_clk; idx++, list++) {
	if (list->table)
	clk = clk_register_divider_table(NULL, list->name,
	list->parent_name, list->flags,
	ctx->reg_base + list->offset,
	list->shift, list->width, list->div_flags,
	list->table, &ctx->lock);
	else
	clk = clk_register_divider(NULL, list->name,
	list->parent_name, list->flags,
	ctx->reg_base + list->offset, list->shift,
	list->width, list->div_flags, &ctx->lock);
	if (IS_ERR(clk)) {
	pr_err("%s: failed to register clock %s\n", __func__,
	list->name);
	continue;
	}

	samsung_clk_add_lookup(ctx, clk, list->id);

	/* register a clock lookup only if a clock alias is specified */
	if (list->alias) {
	ret = clk_register_clkdev(clk, list->alias,
	list->dev_name);
	if (ret)
	pr_err("%s: failed to register lookup %s\n",
	__func__, list->alias);
	}
	}
	}

	/* register a list of gate clocks */
	void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
	struct samsung_gate_clock *list,
	unsigned int nr_clk)
	{
	struct clk *clk;
	unsigned int idx, ret;

	for (idx = 0; idx < nr_clk; idx++, list++) {
	clk = clk_register_gate(NULL, list->name, list->parent_name,
	list->flags, ctx->reg_base + list->offset,
	list->bit_idx, list->gate_flags, &ctx->lock);
	if (IS_ERR(clk)) {
	pr_err("%s: failed to register clock %s\n", __func__,
	list->name);
	continue;
	}

	/* register a clock lookup only if a clock alias is specified */
	if (list->alias) {
	ret = clk_register_clkdev(clk, list->alias,
	list->dev_name);
	if (ret)
	pr_err("%s: failed to register lookup %s\n",
	__func__, list->alias);
	}

	samsung_clk_add_lookup(ctx, clk, list->id);
	}
	}

	/*
	* obtain the clock speed of all external fixed clock sources from device
	* tree and register it
	*/
	#ifdef CONFIG_OF
	void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
	struct samsung_fixed_rate_clock *fixed_rate_clk,
	unsigned int nr_fixed_rate_clk,
	struct of_device_id *clk_matches)
	{
	const struct of_device_id *match;
	struct device_node *clk_np;
	u32 freq;

	for_each_matching_node_and_match(clk_np, clk_matches, &match) {
	if (of_property_read_u32(clk_np, "clock-frequency", &freq))
	continue;
	fixed_rate_clk[(unsigned long)match->data].fixed_rate = freq;
	}
	samsung_clk_register_fixed_rate(ctx, fixed_rate_clk, nr_fixed_rate_clk);
	}
	#endif

	/* utility function to get the rate of a specified clock */
	unsigned long _get_rate(const char *clk_name)
	{
	struct clk *clk;

	clk = __clk_lookup(clk_name);
	if (!clk) {
	pr_err("%s: could not find clock %s\n", __func__, clk_name);
	return 0;
	}

	return clk_get_rate(clk);
	}