drivers/sh/clk/cpg.c - arm/linux - Git at Google

 /*
  * Helper routines for SuperH Clock Pulse Generator blocks (CPG).
  *
  *  Copyright (C) 2010  Magnus Damm
  *  Copyright (C) 2010 - 2012  Paul Mundt
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
 #include <linux/clk.h>
 #include <linux/compiler.h>
 #include <linux/slab.h>
 #include <linux/io.h>
 #include <linux/sh_clk.h>

 static unsigned int sh_clk_read(struct clk *clk)
 {
 	if (clk->flags & CLK_ENABLE_REG_8BIT)
 		return ioread8(clk->mapped_reg);
 	else if (clk->flags & CLK_ENABLE_REG_16BIT)
 		return ioread16(clk->mapped_reg);

 	return ioread32(clk->mapped_reg);
 }

 static void sh_clk_write(int value, struct clk *clk)
 {
 	if (clk->flags & CLK_ENABLE_REG_8BIT)
 		iowrite8(value, clk->mapped_reg);
 	else if (clk->flags & CLK_ENABLE_REG_16BIT)
 		iowrite16(value, clk->mapped_reg);
 	else
 		iowrite32(value, clk->mapped_reg);
 }

 static int sh_clk_mstp_enable(struct clk *clk)
 {
 	sh_clk_write(sh_clk_read(clk) & ~(1 << clk->enable_bit), clk);
 	return 0;
 }

 static void sh_clk_mstp_disable(struct clk *clk)
 {
 	sh_clk_write(sh_clk_read(clk) | (1 << clk->enable_bit), clk);
 }

 static struct sh_clk_ops sh_clk_mstp_clk_ops = {
 	.enable		= sh_clk_mstp_enable,
 	.disable	= sh_clk_mstp_disable,
 	.recalc		= followparent_recalc,
 };

 int __init sh_clk_mstp_register(struct clk *clks, int nr)
 {
 	struct clk *clkp;
 	int ret = 0;
 	int k;

 	for (k = 0; !ret && (k < nr); k++) {
 		clkp = clks + k;
 		clkp->ops = &sh_clk_mstp_clk_ops;
 		ret |= clk_register(clkp);
 	}

 	return ret;
 }

 static long sh_clk_div_round_rate(struct clk *clk, unsigned long rate)
 {
 	return clk_rate_table_round(clk, clk->freq_table, rate);
 }

 /*
  * Div/mult table lookup helpers
  */
 static inline struct clk_div_table *clk_to_div_table(struct clk *clk)
 {
 	return clk->priv;
 }

 static inline struct clk_div_mult_table *clk_to_div_mult_table(struct clk *clk)
 {
 	return clk_to_div_table(clk)->div_mult_table;
 }

 /*
  * div6 support
  */
 static int sh_clk_div6_divisors[64] = {
 	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
 	17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
 	33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
 	49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64
 };

 static struct clk_div_mult_table div6_div_mult_table = {
 	.divisors = sh_clk_div6_divisors,
 	.nr_divisors = ARRAY_SIZE(sh_clk_div6_divisors),
 };

 static struct clk_div_table sh_clk_div6_table = {
 	.div_mult_table	= &div6_div_mult_table,
 };

 static unsigned long sh_clk_div6_recalc(struct clk *clk)
 {
 	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
 	unsigned int idx;

 	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
 			     table, NULL);

 	idx = sh_clk_read(clk) & 0x003f;

 	return clk->freq_table[idx].frequency;
 }

 static int sh_clk_div6_set_parent(struct clk *clk, struct clk *parent)
 {
 	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
 	u32 value;
 	int ret, i;

 	if (!clk->parent_table || !clk->parent_num)
 		return -EINVAL;

 	/* Search the parent */
 	for (i = 0; i < clk->parent_num; i++)
 		if (clk->parent_table[i] == parent)
 			break;

 	if (i == clk->parent_num)
 		return -ENODEV;

 	ret = clk_reparent(clk, parent);
 	if (ret < 0)
 		return ret;

 	value = sh_clk_read(clk) &
 		~(((1 << clk->src_width) - 1) << clk->src_shift);

 	sh_clk_write(value | (i << clk->src_shift), clk);

 	/* Rebuild the frequency table */
 	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
 			     table, NULL);

 	return 0;
 }

 static int sh_clk_div6_set_rate(struct clk *clk, unsigned long rate)
 {
 	unsigned long value;
 	int idx;

 	idx = clk_rate_table_find(clk, clk->freq_table, rate);
 	if (idx < 0)
 		return idx;

 	value = sh_clk_read(clk);
 	value &= ~0x3f;
 	value |= idx;
 	sh_clk_write(value, clk);
 	return 0;
 }

 static int sh_clk_div6_enable(struct clk *clk)
 {
 	unsigned long value;
 	int ret;

 	ret = sh_clk_div6_set_rate(clk, clk->rate);
 	if (ret == 0) {
 		value = sh_clk_read(clk);
 		value &= ~0x100; /* clear stop bit to enable clock */
 		sh_clk_write(value, clk);
 	}
 	return ret;
 }

 static void sh_clk_div6_disable(struct clk *clk)
 {
 	unsigned long value;

 	value = sh_clk_read(clk);
 	value |= 0x100; /* stop clock */
 	value |= 0x3f; /* VDIV bits must be non-zero, overwrite divider */
 	sh_clk_write(value, clk);
 }

 static struct sh_clk_ops sh_clk_div6_clk_ops = {
 	.recalc		= sh_clk_div6_recalc,
 	.round_rate	= sh_clk_div_round_rate,
 	.set_rate	= sh_clk_div6_set_rate,
 	.enable		= sh_clk_div6_enable,
 	.disable	= sh_clk_div6_disable,
 };

 static struct sh_clk_ops sh_clk_div6_reparent_clk_ops = {
 	.recalc		= sh_clk_div6_recalc,
 	.round_rate	= sh_clk_div_round_rate,
 	.set_rate	= sh_clk_div6_set_rate,
 	.enable		= sh_clk_div6_enable,
 	.disable	= sh_clk_div6_disable,
 	.set_parent	= sh_clk_div6_set_parent,
 };

 static int __init sh_clk_init_parent(struct clk *clk)
 {
 	u32 val;

 	if (clk->parent)
 		return 0;

 	if (!clk->parent_table || !clk->parent_num)
 		return 0;

 	if (!clk->src_width) {
 		pr_err("sh_clk_init_parent: cannot select parent clock\n");
 		return -EINVAL;
 	}

 	val  = (sh_clk_read(clk) >> clk->src_shift);
 	val &= (1 << clk->src_width) - 1;

 	if (val >= clk->parent_num) {
 		pr_err("sh_clk_init_parent: parent table size failed\n");
 		return -EINVAL;
 	}

 	clk_reparent(clk, clk->parent_table[val]);
 	if (!clk->parent) {
 		pr_err("sh_clk_init_parent: unable to set parent");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int __init sh_clk_div6_register_ops(struct clk *clks, int nr,
 					   struct sh_clk_ops *ops)
 {
 	struct clk *clkp;
 	void *freq_table;
 	struct clk_div_table *table = &sh_clk_div6_table;
 	int nr_divs = table->div_mult_table->nr_divisors;
 	int freq_table_size = sizeof(struct cpufreq_frequency_table);
 	int ret = 0;
 	int k;

 	freq_table_size *= (nr_divs + 1);
 	freq_table = kzalloc(freq_table_size * nr, GFP_KERNEL);
 	if (!freq_table) {
 		pr_err("sh_clk_div6_register: unable to alloc memory\n");
 		return -ENOMEM;
 	}

 	for (k = 0; !ret && (k < nr); k++) {
 		clkp = clks + k;

 		clkp->ops = ops;
 		clkp->priv = table;
 		clkp->freq_table = freq_table + (k * freq_table_size);
 		clkp->freq_table[nr_divs].frequency = CPUFREQ_TABLE_END;
 		ret = clk_register(clkp);
 		if (ret < 0)
 			break;

 		ret = sh_clk_init_parent(clkp);
 	}

 	return ret;
 }

 int __init sh_clk_div6_register(struct clk *clks, int nr)
 {
 	return sh_clk_div6_register_ops(clks, nr, &sh_clk_div6_clk_ops);
 }

 int __init sh_clk_div6_reparent_register(struct clk *clks, int nr)
 {
 	return sh_clk_div6_register_ops(clks, nr,
 					&sh_clk_div6_reparent_clk_ops);
 }

 /*
  * div4 support
  */
 static unsigned long sh_clk_div4_recalc(struct clk *clk)
 {
 	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
 	unsigned int idx;

 	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
 			     table, &clk->arch_flags);

 	idx = (sh_clk_read(clk) >> clk->enable_bit) & 0x000f;

 	return clk->freq_table[idx].frequency;
 }

 static int sh_clk_div4_set_parent(struct clk *clk, struct clk *parent)
 {
 	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
 	u32 value;
 	int ret;

 	/* we really need a better way to determine parent index, but for
 	 * now assume internal parent comes with CLK_ENABLE_ON_INIT set,
 	 * no CLK_ENABLE_ON_INIT means external clock...
 	 */

 	if (parent->flags & CLK_ENABLE_ON_INIT)
 		value = sh_clk_read(clk) & ~(1 << 7);
 	else
 		value = sh_clk_read(clk) | (1 << 7);

 	ret = clk_reparent(clk, parent);
 	if (ret < 0)
 		return ret;

 	sh_clk_write(value, clk);

 	/* Rebiuld the frequency table */
 	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
 			     table, &clk->arch_flags);

 	return 0;
 }

 static int sh_clk_div4_set_rate(struct clk *clk, unsigned long rate)
 {
 	struct clk_div_table *dt = clk_to_div_table(clk);
 	unsigned long value;
 	int idx = clk_rate_table_find(clk, clk->freq_table, rate);
 	if (idx < 0)
 		return idx;

 	value = sh_clk_read(clk);
 	value &= ~(0xf << clk->enable_bit);
 	value |= (idx << clk->enable_bit);
 	sh_clk_write(value, clk);

 	/* XXX: Should use a post-change notifier */
 	if (dt->kick)
 		dt->kick(clk);

 	return 0;
 }

 static int sh_clk_div4_enable(struct clk *clk)
 {
 	sh_clk_write(sh_clk_read(clk) & ~(1 << 8), clk);
 	return 0;
 }

 static void sh_clk_div4_disable(struct clk *clk)
 {
 	sh_clk_write(sh_clk_read(clk) | (1 << 8), clk);
 }

 static struct sh_clk_ops sh_clk_div4_clk_ops = {
 	.recalc		= sh_clk_div4_recalc,
 	.set_rate	= sh_clk_div4_set_rate,
 	.round_rate	= sh_clk_div_round_rate,
 };

 static struct sh_clk_ops sh_clk_div4_enable_clk_ops = {
 	.recalc		= sh_clk_div4_recalc,
 	.set_rate	= sh_clk_div4_set_rate,
 	.round_rate	= sh_clk_div_round_rate,
 	.enable		= sh_clk_div4_enable,
 	.disable	= sh_clk_div4_disable,
 };

 static struct sh_clk_ops sh_clk_div4_reparent_clk_ops = {
 	.recalc		= sh_clk_div4_recalc,
 	.set_rate	= sh_clk_div4_set_rate,
 	.round_rate	= sh_clk_div_round_rate,
 	.enable		= sh_clk_div4_enable,
 	.disable	= sh_clk_div4_disable,
 	.set_parent	= sh_clk_div4_set_parent,
 };

 static int __init sh_clk_div4_register_ops(struct clk *clks, int nr,
 			struct clk_div4_table *table, struct sh_clk_ops *ops)
 {
 	struct clk *clkp;
 	void *freq_table;
 	int nr_divs = table->div_mult_table->nr_divisors;
 	int freq_table_size = sizeof(struct cpufreq_frequency_table);
 	int ret = 0;
 	int k;

 	freq_table_size *= (nr_divs + 1);
 	freq_table = kzalloc(freq_table_size * nr, GFP_KERNEL);
 	if (!freq_table) {
 		pr_err("sh_clk_div4_register: unable to alloc memory\n");
 		return -ENOMEM;
 	}

 	for (k = 0; !ret && (k < nr); k++) {
 		clkp = clks + k;

 		clkp->ops = ops;
 		clkp->priv = table;

 		clkp->freq_table = freq_table + (k * freq_table_size);
 		clkp->freq_table[nr_divs].frequency = CPUFREQ_TABLE_END;

 		ret = clk_register(clkp);
 	}

 	return ret;
 }

 int __init sh_clk_div4_register(struct clk *clks, int nr,
 				struct clk_div4_table *table)
 {
 	return sh_clk_div4_register_ops(clks, nr, table, &sh_clk_div4_clk_ops);
 }

 int __init sh_clk_div4_enable_register(struct clk *clks, int nr,
 				struct clk_div4_table *table)
 {
 	return sh_clk_div4_register_ops(clks, nr, table,
 					&sh_clk_div4_enable_clk_ops);
 }

 int __init sh_clk_div4_reparent_register(struct clk *clks, int nr,
 				struct clk_div4_table *table)
 {
 	return sh_clk_div4_register_ops(clks, nr, table,
 					&sh_clk_div4_reparent_clk_ops);
 }
	/*
	* Helper routines for SuperH Clock Pulse Generator blocks (CPG).
	*
	* Copyright (C) 2010 Magnus Damm
	* Copyright (C) 2010 - 2012 Paul Mundt
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*/
	#include <linux/clk.h>
	#include <linux/compiler.h>
	#include <linux/slab.h>
	#include <linux/io.h>
	#include <linux/sh_clk.h>

	static unsigned int sh_clk_read(struct clk *clk)
	{
	if (clk->flags & CLK_ENABLE_REG_8BIT)
	return ioread8(clk->mapped_reg);
	else if (clk->flags & CLK_ENABLE_REG_16BIT)
	return ioread16(clk->mapped_reg);

	return ioread32(clk->mapped_reg);
	}

	static void sh_clk_write(int value, struct clk *clk)
	{
	if (clk->flags & CLK_ENABLE_REG_8BIT)
	iowrite8(value, clk->mapped_reg);
	else if (clk->flags & CLK_ENABLE_REG_16BIT)
	iowrite16(value, clk->mapped_reg);
	else
	iowrite32(value, clk->mapped_reg);
	}

	static int sh_clk_mstp_enable(struct clk *clk)
	{
	sh_clk_write(sh_clk_read(clk) & ~(1 << clk->enable_bit), clk);
	return 0;
	}

	static void sh_clk_mstp_disable(struct clk *clk)
	{
	sh_clk_write(sh_clk_read(clk) \| (1 << clk->enable_bit), clk);
	}

	static struct sh_clk_ops sh_clk_mstp_clk_ops = {
	.enable = sh_clk_mstp_enable,
	.disable = sh_clk_mstp_disable,
	.recalc = followparent_recalc,
	};

	int __init sh_clk_mstp_register(struct clk *clks, int nr)
	{
	struct clk *clkp;
	int ret = 0;
	int k;

	for (k = 0; !ret && (k < nr); k++) {
	clkp = clks + k;
	clkp->ops = &sh_clk_mstp_clk_ops;
	ret \|= clk_register(clkp);
	}

	return ret;
	}

	static long sh_clk_div_round_rate(struct clk *clk, unsigned long rate)
	{
	return clk_rate_table_round(clk, clk->freq_table, rate);
	}

	/*
	* Div/mult table lookup helpers
	*/
	static inline struct clk_div_table clk_to_div_table(struct clk clk)
	{
	return clk->priv;
	}

	static inline struct clk_div_mult_table clk_to_div_mult_table(struct clk clk)
	{
	return clk_to_div_table(clk)->div_mult_table;
	}

	/*
	* div6 support
	*/
	static int sh_clk_div6_divisors[64] = {
	1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
	17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32,
	33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
	49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64
	};

	static struct clk_div_mult_table div6_div_mult_table = {
	.divisors = sh_clk_div6_divisors,
	.nr_divisors = ARRAY_SIZE(sh_clk_div6_divisors),
	};

	static struct clk_div_table sh_clk_div6_table = {
	.div_mult_table = &div6_div_mult_table,
	};

	static unsigned long sh_clk_div6_recalc(struct clk *clk)
	{
	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
	unsigned int idx;

	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
	table, NULL);

	idx = sh_clk_read(clk) & 0x003f;

	return clk->freq_table[idx].frequency;
	}

	static int sh_clk_div6_set_parent(struct clk clk, struct clk parent)
	{
	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
	u32 value;
	int ret, i;

	if (!clk->parent_table \|\| !clk->parent_num)
	return -EINVAL;

	/* Search the parent */
	for (i = 0; i < clk->parent_num; i++)
	if (clk->parent_table[i] == parent)
	break;

	if (i == clk->parent_num)
	return -ENODEV;

	ret = clk_reparent(clk, parent);
	if (ret < 0)
	return ret;

	value = sh_clk_read(clk) &
	~(((1 << clk->src_width) - 1) << clk->src_shift);

	sh_clk_write(value \| (i << clk->src_shift), clk);

	/* Rebuild the frequency table */
	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
	table, NULL);

	return 0;
	}

	static int sh_clk_div6_set_rate(struct clk *clk, unsigned long rate)
	{
	unsigned long value;
	int idx;

	idx = clk_rate_table_find(clk, clk->freq_table, rate);
	if (idx < 0)
	return idx;

	value = sh_clk_read(clk);
	value &= ~0x3f;
	value \|= idx;
	sh_clk_write(value, clk);
	return 0;
	}

	static int sh_clk_div6_enable(struct clk *clk)
	{
	unsigned long value;
	int ret;

	ret = sh_clk_div6_set_rate(clk, clk->rate);
	if (ret == 0) {
	value = sh_clk_read(clk);
	value &= ~0x100; /* clear stop bit to enable clock */
	sh_clk_write(value, clk);
	}
	return ret;
	}

	static void sh_clk_div6_disable(struct clk *clk)
	{
	unsigned long value;

	value = sh_clk_read(clk);
	value \|= 0x100; /* stop clock */
	value \|= 0x3f; /* VDIV bits must be non-zero, overwrite divider */
	sh_clk_write(value, clk);
	}

	static struct sh_clk_ops sh_clk_div6_clk_ops = {
	.recalc = sh_clk_div6_recalc,
	.round_rate = sh_clk_div_round_rate,
	.set_rate = sh_clk_div6_set_rate,
	.enable = sh_clk_div6_enable,
	.disable = sh_clk_div6_disable,
	};

	static struct sh_clk_ops sh_clk_div6_reparent_clk_ops = {
	.recalc = sh_clk_div6_recalc,
	.round_rate = sh_clk_div_round_rate,
	.set_rate = sh_clk_div6_set_rate,
	.enable = sh_clk_div6_enable,
	.disable = sh_clk_div6_disable,
	.set_parent = sh_clk_div6_set_parent,
	};

	static int __init sh_clk_init_parent(struct clk *clk)
	{
	u32 val;

	if (clk->parent)
	return 0;

	if (!clk->parent_table \|\| !clk->parent_num)
	return 0;

	if (!clk->src_width) {
	pr_err("sh_clk_init_parent: cannot select parent clock\n");
	return -EINVAL;
	}

	val = (sh_clk_read(clk) >> clk->src_shift);
	val &= (1 << clk->src_width) - 1;

	if (val >= clk->parent_num) {
	pr_err("sh_clk_init_parent: parent table size failed\n");
	return -EINVAL;
	}

	clk_reparent(clk, clk->parent_table[val]);
	if (!clk->parent) {
	pr_err("sh_clk_init_parent: unable to set parent");
	return -EINVAL;
	}

	return 0;
	}

	static int __init sh_clk_div6_register_ops(struct clk *clks, int nr,
	struct sh_clk_ops *ops)
	{
	struct clk *clkp;
	void *freq_table;
	struct clk_div_table *table = &sh_clk_div6_table;
	int nr_divs = table->div_mult_table->nr_divisors;
	int freq_table_size = sizeof(struct cpufreq_frequency_table);
	int ret = 0;
	int k;

	freq_table_size *= (nr_divs + 1);
	freq_table = kzalloc(freq_table_size * nr, GFP_KERNEL);
	if (!freq_table) {
	pr_err("sh_clk_div6_register: unable to alloc memory\n");
	return -ENOMEM;
	}

	for (k = 0; !ret && (k < nr); k++) {
	clkp = clks + k;

	clkp->ops = ops;
	clkp->priv = table;
	clkp->freq_table = freq_table + (k * freq_table_size);
	clkp->freq_table[nr_divs].frequency = CPUFREQ_TABLE_END;
	ret = clk_register(clkp);
	if (ret < 0)
	break;

	ret = sh_clk_init_parent(clkp);
	}

	return ret;
	}

	int __init sh_clk_div6_register(struct clk *clks, int nr)
	{
	return sh_clk_div6_register_ops(clks, nr, &sh_clk_div6_clk_ops);
	}

	int __init sh_clk_div6_reparent_register(struct clk *clks, int nr)
	{
	return sh_clk_div6_register_ops(clks, nr,
	&sh_clk_div6_reparent_clk_ops);
	}

	/*
	* div4 support
	*/
	static unsigned long sh_clk_div4_recalc(struct clk *clk)
	{
	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
	unsigned int idx;

	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
	table, &clk->arch_flags);

	idx = (sh_clk_read(clk) >> clk->enable_bit) & 0x000f;

	return clk->freq_table[idx].frequency;
	}

	static int sh_clk_div4_set_parent(struct clk clk, struct clk parent)
	{
	struct clk_div_mult_table *table = clk_to_div_mult_table(clk);
	u32 value;
	int ret;

	/* we really need a better way to determine parent index, but for
	* now assume internal parent comes with CLK_ENABLE_ON_INIT set,
	* no CLK_ENABLE_ON_INIT means external clock...
	*/

	if (parent->flags & CLK_ENABLE_ON_INIT)
	value = sh_clk_read(clk) & ~(1 << 7);
	else
	value = sh_clk_read(clk) \| (1 << 7);

	ret = clk_reparent(clk, parent);
	if (ret < 0)
	return ret;

	sh_clk_write(value, clk);

	/* Rebiuld the frequency table */
	clk_rate_table_build(clk, clk->freq_table, table->nr_divisors,
	table, &clk->arch_flags);

	return 0;
	}

	static int sh_clk_div4_set_rate(struct clk *clk, unsigned long rate)
	{
	struct clk_div_table *dt = clk_to_div_table(clk);
	unsigned long value;
	int idx = clk_rate_table_find(clk, clk->freq_table, rate);
	if (idx < 0)
	return idx;

	value = sh_clk_read(clk);
	value &= ~(0xf << clk->enable_bit);
	value \|= (idx << clk->enable_bit);
	sh_clk_write(value, clk);

	/* XXX: Should use a post-change notifier */
	if (dt->kick)
	dt->kick(clk);

	return 0;
	}

	static int sh_clk_div4_enable(struct clk *clk)
	{
	sh_clk_write(sh_clk_read(clk) & ~(1 << 8), clk);
	return 0;
	}

	static void sh_clk_div4_disable(struct clk *clk)
	{
	sh_clk_write(sh_clk_read(clk) \| (1 << 8), clk);
	}

	static struct sh_clk_ops sh_clk_div4_clk_ops = {
	.recalc = sh_clk_div4_recalc,
	.set_rate = sh_clk_div4_set_rate,
	.round_rate = sh_clk_div_round_rate,
	};

	static struct sh_clk_ops sh_clk_div4_enable_clk_ops = {
	.recalc = sh_clk_div4_recalc,
	.set_rate = sh_clk_div4_set_rate,
	.round_rate = sh_clk_div_round_rate,
	.enable = sh_clk_div4_enable,
	.disable = sh_clk_div4_disable,
	};

	static struct sh_clk_ops sh_clk_div4_reparent_clk_ops = {
	.recalc = sh_clk_div4_recalc,
	.set_rate = sh_clk_div4_set_rate,
	.round_rate = sh_clk_div_round_rate,
	.enable = sh_clk_div4_enable,
	.disable = sh_clk_div4_disable,
	.set_parent = sh_clk_div4_set_parent,
	};

	static int __init sh_clk_div4_register_ops(struct clk *clks, int nr,
	struct clk_div4_table table, struct sh_clk_ops ops)
	{
	struct clk *clkp;
	void *freq_table;
	int nr_divs = table->div_mult_table->nr_divisors;
	int freq_table_size = sizeof(struct cpufreq_frequency_table);
	int ret = 0;
	int k;

	freq_table_size *= (nr_divs + 1);
	freq_table = kzalloc(freq_table_size * nr, GFP_KERNEL);
	if (!freq_table) {
	pr_err("sh_clk_div4_register: unable to alloc memory\n");
	return -ENOMEM;
	}

	for (k = 0; !ret && (k < nr); k++) {
	clkp = clks + k;

	clkp->ops = ops;
	clkp->priv = table;

	clkp->freq_table = freq_table + (k * freq_table_size);
	clkp->freq_table[nr_divs].frequency = CPUFREQ_TABLE_END;

	ret = clk_register(clkp);
	}

	return ret;
	}

	int __init sh_clk_div4_register(struct clk *clks, int nr,
	struct clk_div4_table *table)
	{
	return sh_clk_div4_register_ops(clks, nr, table, &sh_clk_div4_clk_ops);
	}

	int __init sh_clk_div4_enable_register(struct clk *clks, int nr,
	struct clk_div4_table *table)
	{
	return sh_clk_div4_register_ops(clks, nr, table,
	&sh_clk_div4_enable_clk_ops);
	}

	int __init sh_clk_div4_reparent_register(struct clk *clks, int nr,
	struct clk_div4_table *table)
	{
	return sh_clk_div4_register_ops(clks, nr, table,
	&sh_clk_div4_reparent_clk_ops);
	}