drivers/clk/samsung/clk.c - linux - 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"

 static DEFINE_SPINLOCK(lock);
 static struct clk **clk_table;
 static void __iomem *reg_base;
 #ifdef CONFIG_OF
 static struct clk_onecell_data clk_data;
 #endif

 #ifdef CONFIG_PM_SLEEP
 static struct samsung_clk_reg_dump *reg_dump;
 static unsigned long nr_reg_dump;

 static int samsung_clk_suspend(void)
 {
 	struct samsung_clk_reg_dump *rd = reg_dump;
 	unsigned long i;

 	for (i = 0; i < nr_reg_dump; i++, rd++)
 		rd->value = __raw_readl(reg_base + rd->offset);

 	return 0;
 }

 static void samsung_clk_resume(void)
 {
 	struct samsung_clk_reg_dump *rd = reg_dump;
 	unsigned long i;

 	for (i = 0; i < nr_reg_dump; i++, rd++)
 		__raw_writel(rd->value, reg_base + rd->offset);
 }

 static struct syscore_ops samsung_clk_syscore_ops = {
 	.suspend	= samsung_clk_suspend,
 	.resume		= samsung_clk_resume,
 };
 #endif /* CONFIG_PM_SLEEP */

 /* setup the essentials required to support clock lookup using ccf */
 void __init samsung_clk_init(struct device_node *np, void __iomem *base,
 		unsigned long nr_clks, unsigned long *rdump,
 		unsigned long nr_rdump, unsigned long *soc_rdump,
 		unsigned long nr_soc_rdump)
 {
 	reg_base = base;

 #ifdef CONFIG_PM_SLEEP
 	if (rdump && nr_rdump) {
 		unsigned int idx;
 		reg_dump = kzalloc(sizeof(struct samsung_clk_reg_dump)
 				* (nr_rdump + nr_soc_rdump), GFP_KERNEL);
 		if (!reg_dump) {
 			pr_err("%s: memory alloc for register dump failed\n",
 					__func__);
 			return;
 		}

 		for (idx = 0; idx < nr_rdump; idx++)
 			reg_dump[idx].offset = rdump[idx];
 		for (idx = 0; idx < nr_soc_rdump; idx++)
 			reg_dump[nr_rdump + idx].offset = soc_rdump[idx];
 		nr_reg_dump = nr_rdump + nr_soc_rdump;
 		register_syscore_ops(&samsung_clk_syscore_ops);
 	}
 #endif

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

 	if (!np)
 		return;

 #ifdef CONFIG_OF
 	clk_data.clks = clk_table;
 	clk_data.clk_num = nr_clks;
 	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 #endif
 }

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

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

 	if (!clk_table) {
 		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 = clk_table[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_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(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_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(clk, list->id);
 	}
 }

 /* register a list of mux clocks */
 void __init samsung_clk_register_mux(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, reg_base + list->offset,
 			list->shift, list->width, list->mux_flags, &lock);
 		if (IS_ERR(clk)) {
 			pr_err("%s: failed to register clock %s\n", __func__,
 				list->name);
 			continue;
 		}

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

 		samsung_clk_add_lookup(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_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, reg_base + list->offset,
 				list->bit_idx, list->gate_flags, &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(clk, list->id);
 	}
 }

 /*
  * obtain the clock speed of all external fixed clock sources from device
  * tree and register it
  */
 void __init samsung_clk_of_register_fixed_ext(
 			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 *np;
 	u32 freq;

 	for_each_matching_node_and_match(np, clk_matches, &match) {
 		if (of_property_read_u32(np, "clock-frequency", &freq))
 			continue;
 		fixed_rate_clk[(u32)match->data].fixed_rate = freq;
 	}
 	samsung_clk_register_fixed_rate(fixed_rate_clk, nr_fixed_rate_clk);
 }

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

 	clk = clk_get(NULL, clk_name);
 	if (IS_ERR(clk)) {
 		pr_err("%s: could not find clock %s\n", __func__, clk_name);
 		return 0;
 	}
 	rate = clk_get_rate(clk);
 	clk_put(clk);
 	return rate;
 }
	/*
	* 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"

	static DEFINE_SPINLOCK(lock);
	static struct clk **clk_table;
	static void __iomem *reg_base;
	#ifdef CONFIG_OF
	static struct clk_onecell_data clk_data;
	#endif

	#ifdef CONFIG_PM_SLEEP
	static struct samsung_clk_reg_dump *reg_dump;
	static unsigned long nr_reg_dump;

	static int samsung_clk_suspend(void)
	{
	struct samsung_clk_reg_dump *rd = reg_dump;
	unsigned long i;

	for (i = 0; i < nr_reg_dump; i++, rd++)
	rd->value = __raw_readl(reg_base + rd->offset);

	return 0;
	}

	static void samsung_clk_resume(void)
	{
	struct samsung_clk_reg_dump *rd = reg_dump;
	unsigned long i;

	for (i = 0; i < nr_reg_dump; i++, rd++)
	__raw_writel(rd->value, reg_base + rd->offset);
	}

	static struct syscore_ops samsung_clk_syscore_ops = {
	.suspend = samsung_clk_suspend,
	.resume = samsung_clk_resume,
	};
	#endif /* CONFIG_PM_SLEEP */

	/* setup the essentials required to support clock lookup using ccf */
	void __init samsung_clk_init(struct device_node np, void __iomem base,
	unsigned long nr_clks, unsigned long *rdump,
	unsigned long nr_rdump, unsigned long *soc_rdump,
	unsigned long nr_soc_rdump)
	{
	reg_base = base;

	#ifdef CONFIG_PM_SLEEP
	if (rdump && nr_rdump) {
	unsigned int idx;
	reg_dump = kzalloc(sizeof(struct samsung_clk_reg_dump)
	* (nr_rdump + nr_soc_rdump), GFP_KERNEL);
	if (!reg_dump) {
	pr_err("%s: memory alloc for register dump failed\n",
	__func__);
	return;
	}

	for (idx = 0; idx < nr_rdump; idx++)
	reg_dump[idx].offset = rdump[idx];
	for (idx = 0; idx < nr_soc_rdump; idx++)
	reg_dump[nr_rdump + idx].offset = soc_rdump[idx];
	nr_reg_dump = nr_rdump + nr_soc_rdump;
	register_syscore_ops(&samsung_clk_syscore_ops);
	}
	#endif

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

	if (!np)
	return;

	#ifdef CONFIG_OF
	clk_data.clks = clk_table;
	clk_data.clk_num = nr_clks;
	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
	#endif
	}

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

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

	if (!clk_table) {
	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 = clk_table[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_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(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_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(clk, list->id);
	}
	}

	/* register a list of mux clocks */
	void __init samsung_clk_register_mux(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, reg_base + list->offset,
	list->shift, list->width, list->mux_flags, &lock);
	if (IS_ERR(clk)) {
	pr_err("%s: failed to register clock %s\n", __func__,
	list->name);
	continue;
	}

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

	samsung_clk_add_lookup(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_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, reg_base + list->offset,
	list->bit_idx, list->gate_flags, &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(clk, list->id);
	}
	}

	/*
	* obtain the clock speed of all external fixed clock sources from device
	* tree and register it
	*/
	void __init samsung_clk_of_register_fixed_ext(
	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 *np;
	u32 freq;

	for_each_matching_node_and_match(np, clk_matches, &match) {
	if (of_property_read_u32(np, "clock-frequency", &freq))
	continue;
	fixed_rate_clk[(u32)match->data].fixed_rate = freq;
	}
	samsung_clk_register_fixed_rate(fixed_rate_clk, nr_fixed_rate_clk);
	}

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

	clk = clk_get(NULL, clk_name);
	if (IS_ERR(clk)) {
	pr_err("%s: could not find clock %s\n", __func__, clk_name);
	return 0;
	}
	rate = clk_get_rate(clk);
	clk_put(clk);
	return rate;
	}