arch/arm/plat-s3c24xx/pwm-clock.c - kernel/msm-4.9 - Gitiles

 /* linux/arch/arm/plat-s3c24xx/pwm-clock.c
  *
  * Copyright (c) 2007 Simtec Electronics
  * Copyright (c) 2007, 2008 Ben Dooks
  *	Ben Dooks <ben-linux@fluff.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License.
 */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>

 #include <mach/hardware.h>
 #include <asm/irq.h>

 #include <mach/regs-clock.h>
 #include <mach/regs-gpio.h>

 #include <plat/clock.h>
 #include <plat/cpu.h>

 #include <plat/regs-timer.h>

 /* Each of the timers 0 through 5 go through the following
  * clock tree, with the inputs depending on the timers.
  *
  * pclk ---- [ prescaler 0 ] -+---> timer 0
  *			      +---> timer 1
  *
  * pclk ---- [ prescaler 1 ] -+---> timer 2
  *			      +---> timer 3
  *			      \---> timer 4
  *
  * Which are fed into the timers as so:
  *
  * prescaled 0 ---- [ div 2,4,8,16 ] ---\
  *				       [mux] -> timer 0
  * tclk 0 ------------------------------/
  *
  * prescaled 0 ---- [ div 2,4,8,16 ] ---\
  *				       [mux] -> timer 1
  * tclk 0 ------------------------------/
  *
  *
  * prescaled 1 ---- [ div 2,4,8,16 ] ---\
  *				       [mux] -> timer 2
  * tclk 1 ------------------------------/
  *
  * prescaled 1 ---- [ div 2,4,8,16 ] ---\
  *				       [mux] -> timer 3
  * tclk 1 ------------------------------/
  *
  * prescaled 1 ---- [ div 2,4,8, 16 ] --\
  *				       [mux] -> timer 4
  * tclk 1 ------------------------------/
  *
  * Since the mux and the divider are tied together in the
  * same register space, it is impossible to set the parent
  * and the rate at the same time. To avoid this, we add an
  * intermediate 'prescaled-and-divided' clock to select
  * as the parent for the timer input clock called tdiv.
  *
  * prescaled clk --> pwm-tdiv ---\
  *                             [ mux ] --> timer X
  * tclk -------------------------/
 */

 static unsigned long clk_pwm_scaler_getrate(struct clk *clk)
 {
 	unsigned long tcfg0 = __raw_readl(S3C2410_TCFG0);

 	if (clk->id == 1) {
 		tcfg0 &= S3C2410_TCFG_PRESCALER1_MASK;
 		tcfg0 >>= S3C2410_TCFG_PRESCALER1_SHIFT;
 	} else {
 		tcfg0 &= S3C2410_TCFG_PRESCALER0_MASK;
 	}

 	return clk_get_rate(clk->parent) / (tcfg0 + 1);
 }

 /* TODO - add set rate calls. */

 static struct clk clk_timer_scaler[] = {
 	[0]	= {
 		.name		= "pwm-scaler0",
 		.id		= -1,
 		.get_rate	= clk_pwm_scaler_getrate,
 	},
 	[1]	= {
 		.name		= "pwm-scaler1",
 		.id		= -1,
 		.get_rate	= clk_pwm_scaler_getrate,
 	},
 };

 static struct clk clk_timer_tclk[] = {
 	[0]	= {
 		.name		= "pwm-tclk0",
 		.id		= -1,
 	},
 	[1]	= {
 		.name		= "pwm-tclk1",
 		.id		= -1,
 	},
 };

 struct pwm_tdiv_clk {
 	struct clk	clk;
 	unsigned int	divisor;
 };

 static inline struct pwm_tdiv_clk *to_tdiv(struct clk *clk)
 {
 	return container_of(clk, struct pwm_tdiv_clk, clk);
 }

 static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
 {
 	return 1 << (1 + tcfg1);
 }

 static unsigned long clk_pwm_tdiv_get_rate(struct clk *clk)
 {
 	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
 	unsigned int divisor;

 	tcfg1 >>= S3C2410_TCFG1_SHIFT(clk->id);
 	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

 	if (tcfg1 == S3C2410_TCFG1_MUX_TCLK)
 		divisor = to_tdiv(clk)->divisor;
 	else
 		divisor = tcfg_to_divisor(tcfg1);

 	return clk_get_rate(clk->parent) / divisor;
 }

 static unsigned long clk_pwm_tdiv_round_rate(struct clk *clk,
 					     unsigned long rate)
 {
 	unsigned long parent_rate;
 	unsigned long divisor;

 	parent_rate = clk_get_rate(clk->parent);
 	divisor = parent_rate / rate;

 	if (divisor <= 2)
 		divisor = 2;
 	else if (divisor <= 4)
 		divisor = 4;
 	else if (divisor <= 8)
 		divisor = 8;
 	else
 		divisor = 16;

 	return parent_rate / divisor;
 }

 static unsigned long clk_pwm_tdiv_bits(struct pwm_tdiv_clk *divclk)
 {
 	unsigned long bits;

 	switch (divclk->divisor) {
 	case 2:
 		bits = S3C2410_TCFG1_MUX_DIV2;
 		break;
 	case 4:
 		bits = S3C2410_TCFG1_MUX_DIV4;
 		break;
 	case 8:
 		bits = S3C2410_TCFG1_MUX_DIV8;
 		break;
 	case 16:
 	default:
 		bits = S3C2410_TCFG1_MUX_DIV16;
 		break;
 	}

 	return bits;
 }

 static void clk_pwm_tdiv_update(struct pwm_tdiv_clk *divclk)
 {
 	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
 	unsigned long bits = clk_pwm_tdiv_bits(divclk);
 	unsigned long flags;
 	unsigned long shift =  S3C2410_TCFG1_SHIFT(divclk->clk.id);

 	local_irq_save(flags);

 	tcfg1 = __raw_readl(S3C2410_TCFG1);
 	tcfg1 &= ~(S3C2410_TCFG1_MUX_MASK << shift);
 	tcfg1 |= bits << shift;
 	__raw_writel(tcfg1, S3C2410_TCFG1);

 	local_irq_restore(flags);
 }

 static int clk_pwm_tdiv_set_rate(struct clk *clk, unsigned long rate)
 {
 	struct pwm_tdiv_clk *divclk = to_tdiv(clk);
 	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
 	unsigned long parent_rate = clk_get_rate(clk->parent);
 	unsigned long divisor;

 	tcfg1 >>= S3C2410_TCFG1_SHIFT(clk->id);
 	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

 	rate = clk_round_rate(clk, rate);
 	divisor = parent_rate / rate;

 	if (divisor > 16)
 		return -EINVAL;

 	divclk->divisor = divisor;

 	/* Update the current MUX settings if we are currently
 	 * selected as the clock source for this clock. */

 	if (tcfg1 != S3C2410_TCFG1_MUX_TCLK)
 		clk_pwm_tdiv_update(divclk);

 	return 0;
 }

 static struct pwm_tdiv_clk clk_timer_tdiv[] = {
 	[0]	= {
 		.clk	= {
 			.name		= "pwm-tdiv",
 			.parent		= &clk_timer_scaler[0],
 			.get_rate	= clk_pwm_tdiv_get_rate,
 			.set_rate	= clk_pwm_tdiv_set_rate,
 			.round_rate	= clk_pwm_tdiv_round_rate,
 		},
 	},
 	[1]	= {
 		.clk	= {
 			.name		= "pwm-tdiv",
 			.parent		= &clk_timer_scaler[0],
 			.get_rate	= clk_pwm_tdiv_get_rate,
 			.set_rate	= clk_pwm_tdiv_set_rate,
 			.round_rate	= clk_pwm_tdiv_round_rate,
 		}
 	},
 	[2]	= {
 		.clk	= {
 			.name		= "pwm-tdiv",
 			.parent		= &clk_timer_scaler[1],
 			.get_rate	= clk_pwm_tdiv_get_rate,
 			.set_rate	= clk_pwm_tdiv_set_rate,
 			.round_rate	= clk_pwm_tdiv_round_rate,
 		},
 	},
 	[3]	= {
 		.clk	= {
 			.name		= "pwm-tdiv",
 			.parent		= &clk_timer_scaler[1],
 			.get_rate	= clk_pwm_tdiv_get_rate,
 			.set_rate	= clk_pwm_tdiv_set_rate,
 			.round_rate	= clk_pwm_tdiv_round_rate,
 		},
 	},
 	[4]	= {
 		.clk	= {
 			.name		= "pwm-tdiv",
 			.parent		= &clk_timer_scaler[1],
 			.get_rate	= clk_pwm_tdiv_get_rate,
 			.set_rate	= clk_pwm_tdiv_set_rate,
 			.round_rate	= clk_pwm_tdiv_round_rate,
 		},
 	},
 };

 static int __init clk_pwm_tdiv_register(unsigned int id)
 {
 	struct pwm_tdiv_clk *divclk = &clk_timer_tdiv[id];
 	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);

 	tcfg1 >>= S3C2410_TCFG1_SHIFT(id);
 	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

 	divclk->clk.id = id;
 	divclk->divisor = tcfg_to_divisor(tcfg1);

 	return s3c24xx_register_clock(&divclk->clk);
 }

 static inline struct clk *s3c24xx_pwmclk_tclk(unsigned int id)
 {
 	return (id >= 2) ? &clk_timer_tclk[1] : &clk_timer_tclk[0];
 }

 static inline struct clk *s3c24xx_pwmclk_tdiv(unsigned int id)
 {
 	return &clk_timer_tdiv[id].clk;
 }

 static int clk_pwm_tin_set_parent(struct clk *clk, struct clk *parent)
 {
 	unsigned int id = clk->id;
 	unsigned long tcfg1;
 	unsigned long flags;
 	unsigned long bits;
 	unsigned long shift = S3C2410_TCFG1_SHIFT(id);

 	if (parent == s3c24xx_pwmclk_tclk(id))
 		bits = S3C2410_TCFG1_MUX_TCLK << shift;
 	else if (parent == s3c24xx_pwmclk_tdiv(id))
 		bits = clk_pwm_tdiv_bits(to_tdiv(parent)) << shift;
 	else
 		return -EINVAL;

 	clk->parent = parent;

 	local_irq_save(flags);

 	tcfg1 = __raw_readl(S3C2410_TCFG1);
 	tcfg1 &= ~(S3C2410_TCFG1_MUX_MASK << shift);
 	__raw_writel(tcfg1 | bits, S3C2410_TCFG1);

 	local_irq_restore(flags);

 	return 0;
 }

 static struct clk clk_tin[] = {
 	[0]	= {
 		.name		= "pwm-tin",
 		.id		= 0,
 		.set_parent	= clk_pwm_tin_set_parent,
 	},
 	[1]	= {
 		.name		= "pwm-tin",
 		.id		= 1,
 		.set_parent	= clk_pwm_tin_set_parent,
 	},
 	[2]	= {
 		.name		= "pwm-tin",
 		.id		= 2,
 		.set_parent	= clk_pwm_tin_set_parent,
 	},
 	[3]	= {
 		.name		= "pwm-tin",
 		.id		= 3,
 		.set_parent	= clk_pwm_tin_set_parent,
 	},
 	[4]	= {
 		.name		= "pwm-tin",
 		.id		= 4,
 		.set_parent	= clk_pwm_tin_set_parent,
 	},
 };

 static __init int clk_pwm_tin_register(struct clk *pwm)
 {
 	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
 	unsigned int id = pwm->id;

 	struct clk *parent;
 	int ret;

 	ret = s3c24xx_register_clock(pwm);
 	if (ret < 0)
 		return ret;

 	tcfg1 >>= S3C2410_TCFG1_SHIFT(id);
 	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

 	if (tcfg1 == S3C2410_TCFG1_MUX_TCLK)
 		parent = s3c24xx_pwmclk_tclk(id);
 	else
 		parent = s3c24xx_pwmclk_tdiv(id);

 	return clk_set_parent(pwm, parent);
 }

 static __init int s3c24xx_pwmclk_init(void)
 {
 	struct clk *clk_timers;
 	unsigned int clk;
 	int ret;

 	clk_timers = clk_get(NULL, "timers");
 	if (IS_ERR(clk_timers)) {
 		printk(KERN_ERR "%s: no parent clock\n", __func__);
 		return -EINVAL;
 	}

 	for (clk = 0; clk < ARRAY_SIZE(clk_timer_scaler); clk++) {
 		clk_timer_scaler[clk].parent = clk_timers;
 		ret = s3c24xx_register_clock(&clk_timer_scaler[clk]);
 		if (ret < 0) {
 			printk(KERN_ERR "error adding pwm scaler%d clock\n", clk);
 			goto err;
 		}
 	}

 	for (clk = 0; clk < ARRAY_SIZE(clk_timer_tclk); clk++) {
 		ret = s3c24xx_register_clock(&clk_timer_tclk[clk]);
 		if (ret < 0) {
 			printk(KERN_ERR "error adding pww tclk%d\n", clk);
 			goto err;
 		}
 	}

 	for (clk = 0; clk < ARRAY_SIZE(clk_timer_tdiv); clk++) {
 		ret = clk_pwm_tdiv_register(clk);
 		if (ret < 0) {
 			printk(KERN_ERR "error adding pwm%d tdiv clock\n", clk);
 			goto err;
 		}
 	}

 	for (clk = 0; clk < ARRAY_SIZE(clk_tin); clk++) {
 		ret = clk_pwm_tin_register(&clk_tin[clk]);
 		if (ret < 0) {
 			printk(KERN_ERR "error adding pwm%d tin clock\n", clk);
 			goto err;
 		}
 	}

 	return 0;

  err:
 	return ret;
 }

 arch_initcall(s3c24xx_pwmclk_init);
	/* linux/arch/arm/plat-s3c24xx/pwm-clock.c
	*
	* Copyright (c) 2007 Simtec Electronics
	* Copyright (c) 2007, 2008 Ben Dooks
	* Ben Dooks <ben-linux@fluff.org>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License.
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/list.h>
	#include <linux/errno.h>
	#include <linux/clk.h>
	#include <linux/err.h>
	#include <linux/io.h>

	#include <mach/hardware.h>
	#include <asm/irq.h>

	#include <mach/regs-clock.h>
	#include <mach/regs-gpio.h>

	#include <plat/clock.h>
	#include <plat/cpu.h>

	#include <plat/regs-timer.h>

	/* Each of the timers 0 through 5 go through the following
	* clock tree, with the inputs depending on the timers.
	*
	* pclk ---- [ prescaler 0 ] -+---> timer 0
	* +---> timer 1
	*
	* pclk ---- [ prescaler 1 ] -+---> timer 2
	* +---> timer 3
	* \---> timer 4
	*
	* Which are fed into the timers as so:
	*
	* prescaled 0 ---- [ div 2,4,8,16 ] ---\
	* [mux] -> timer 0
	* tclk 0 ------------------------------/
	*
	* prescaled 0 ---- [ div 2,4,8,16 ] ---\
	* [mux] -> timer 1
	* tclk 0 ------------------------------/
	*
	*
	* prescaled 1 ---- [ div 2,4,8,16 ] ---\
	* [mux] -> timer 2
	* tclk 1 ------------------------------/
	*
	* prescaled 1 ---- [ div 2,4,8,16 ] ---\
	* [mux] -> timer 3
	* tclk 1 ------------------------------/
	*
	* prescaled 1 ---- [ div 2,4,8, 16 ] --\
	* [mux] -> timer 4
	* tclk 1 ------------------------------/
	*
	* Since the mux and the divider are tied together in the
	* same register space, it is impossible to set the parent
	* and the rate at the same time. To avoid this, we add an
	* intermediate 'prescaled-and-divided' clock to select
	* as the parent for the timer input clock called tdiv.
	*
	* prescaled clk --> pwm-tdiv ---\
	* [ mux ] --> timer X
	* tclk -------------------------/
	*/

	static unsigned long clk_pwm_scaler_getrate(struct clk *clk)
	{
	unsigned long tcfg0 = __raw_readl(S3C2410_TCFG0);

	if (clk->id == 1) {
	tcfg0 &= S3C2410_TCFG_PRESCALER1_MASK;
	tcfg0 >>= S3C2410_TCFG_PRESCALER1_SHIFT;
	} else {
	tcfg0 &= S3C2410_TCFG_PRESCALER0_MASK;
	}

	return clk_get_rate(clk->parent) / (tcfg0 + 1);
	}

	/* TODO - add set rate calls. */

	static struct clk clk_timer_scaler[] = {
	[0] = {
	.name = "pwm-scaler0",
	.id = -1,
	.get_rate = clk_pwm_scaler_getrate,
	},
	[1] = {
	.name = "pwm-scaler1",
	.id = -1,
	.get_rate = clk_pwm_scaler_getrate,
	},
	};

	static struct clk clk_timer_tclk[] = {
	[0] = {
	.name = "pwm-tclk0",
	.id = -1,
	},
	[1] = {
	.name = "pwm-tclk1",
	.id = -1,
	},
	};

	struct pwm_tdiv_clk {
	struct clk clk;
	unsigned int divisor;
	};

	static inline struct pwm_tdiv_clk to_tdiv(struct clk clk)
	{
	return container_of(clk, struct pwm_tdiv_clk, clk);
	}

	static inline unsigned long tcfg_to_divisor(unsigned long tcfg1)
	{
	return 1 << (1 + tcfg1);
	}

	static unsigned long clk_pwm_tdiv_get_rate(struct clk *clk)
	{
	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
	unsigned int divisor;

	tcfg1 >>= S3C2410_TCFG1_SHIFT(clk->id);
	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

	if (tcfg1 == S3C2410_TCFG1_MUX_TCLK)
	divisor = to_tdiv(clk)->divisor;
	else
	divisor = tcfg_to_divisor(tcfg1);

	return clk_get_rate(clk->parent) / divisor;
	}

	static unsigned long clk_pwm_tdiv_round_rate(struct clk *clk,
	unsigned long rate)
	{
	unsigned long parent_rate;
	unsigned long divisor;

	parent_rate = clk_get_rate(clk->parent);
	divisor = parent_rate / rate;

	if (divisor <= 2)
	divisor = 2;
	else if (divisor <= 4)
	divisor = 4;
	else if (divisor <= 8)
	divisor = 8;
	else
	divisor = 16;

	return parent_rate / divisor;
	}

	static unsigned long clk_pwm_tdiv_bits(struct pwm_tdiv_clk *divclk)
	{
	unsigned long bits;

	switch (divclk->divisor) {
	case 2:
	bits = S3C2410_TCFG1_MUX_DIV2;
	break;
	case 4:
	bits = S3C2410_TCFG1_MUX_DIV4;
	break;
	case 8:
	bits = S3C2410_TCFG1_MUX_DIV8;
	break;
	case 16:
	default:
	bits = S3C2410_TCFG1_MUX_DIV16;
	break;
	}

	return bits;
	}

	static void clk_pwm_tdiv_update(struct pwm_tdiv_clk *divclk)
	{
	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
	unsigned long bits = clk_pwm_tdiv_bits(divclk);
	unsigned long flags;
	unsigned long shift = S3C2410_TCFG1_SHIFT(divclk->clk.id);

	local_irq_save(flags);

	tcfg1 = __raw_readl(S3C2410_TCFG1);
	tcfg1 &= ~(S3C2410_TCFG1_MUX_MASK << shift);
	tcfg1 \|= bits << shift;
	__raw_writel(tcfg1, S3C2410_TCFG1);

	local_irq_restore(flags);
	}

	static int clk_pwm_tdiv_set_rate(struct clk *clk, unsigned long rate)
	{
	struct pwm_tdiv_clk *divclk = to_tdiv(clk);
	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
	unsigned long parent_rate = clk_get_rate(clk->parent);
	unsigned long divisor;

	tcfg1 >>= S3C2410_TCFG1_SHIFT(clk->id);
	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

	rate = clk_round_rate(clk, rate);
	divisor = parent_rate / rate;

	if (divisor > 16)
	return -EINVAL;

	divclk->divisor = divisor;

	/* Update the current MUX settings if we are currently
	* selected as the clock source for this clock. */

	if (tcfg1 != S3C2410_TCFG1_MUX_TCLK)
	clk_pwm_tdiv_update(divclk);

	return 0;
	}

	static struct pwm_tdiv_clk clk_timer_tdiv[] = {
	[0] = {
	.clk = {
	.name = "pwm-tdiv",
	.parent = &clk_timer_scaler[0],
	.get_rate = clk_pwm_tdiv_get_rate,
	.set_rate = clk_pwm_tdiv_set_rate,
	.round_rate = clk_pwm_tdiv_round_rate,
	},
	},
	[1] = {
	.clk = {
	.name = "pwm-tdiv",
	.parent = &clk_timer_scaler[0],
	.get_rate = clk_pwm_tdiv_get_rate,
	.set_rate = clk_pwm_tdiv_set_rate,
	.round_rate = clk_pwm_tdiv_round_rate,
	}
	},
	[2] = {
	.clk = {
	.name = "pwm-tdiv",
	.parent = &clk_timer_scaler[1],
	.get_rate = clk_pwm_tdiv_get_rate,
	.set_rate = clk_pwm_tdiv_set_rate,
	.round_rate = clk_pwm_tdiv_round_rate,
	},
	},
	[3] = {
	.clk = {
	.name = "pwm-tdiv",
	.parent = &clk_timer_scaler[1],
	.get_rate = clk_pwm_tdiv_get_rate,
	.set_rate = clk_pwm_tdiv_set_rate,
	.round_rate = clk_pwm_tdiv_round_rate,
	},
	},
	[4] = {
	.clk = {
	.name = "pwm-tdiv",
	.parent = &clk_timer_scaler[1],
	.get_rate = clk_pwm_tdiv_get_rate,
	.set_rate = clk_pwm_tdiv_set_rate,
	.round_rate = clk_pwm_tdiv_round_rate,
	},
	},
	};

	static int __init clk_pwm_tdiv_register(unsigned int id)
	{
	struct pwm_tdiv_clk *divclk = &clk_timer_tdiv[id];
	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);

	tcfg1 >>= S3C2410_TCFG1_SHIFT(id);
	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

	divclk->clk.id = id;
	divclk->divisor = tcfg_to_divisor(tcfg1);

	return s3c24xx_register_clock(&divclk->clk);
	}

	static inline struct clk *s3c24xx_pwmclk_tclk(unsigned int id)
	{
	return (id >= 2) ? &clk_timer_tclk[1] : &clk_timer_tclk[0];
	}

	static inline struct clk *s3c24xx_pwmclk_tdiv(unsigned int id)
	{
	return &clk_timer_tdiv[id].clk;
	}

	static int clk_pwm_tin_set_parent(struct clk clk, struct clk parent)
	{
	unsigned int id = clk->id;
	unsigned long tcfg1;
	unsigned long flags;
	unsigned long bits;
	unsigned long shift = S3C2410_TCFG1_SHIFT(id);

	if (parent == s3c24xx_pwmclk_tclk(id))
	bits = S3C2410_TCFG1_MUX_TCLK << shift;
	else if (parent == s3c24xx_pwmclk_tdiv(id))
	bits = clk_pwm_tdiv_bits(to_tdiv(parent)) << shift;
	else
	return -EINVAL;

	clk->parent = parent;

	local_irq_save(flags);

	tcfg1 = __raw_readl(S3C2410_TCFG1);
	tcfg1 &= ~(S3C2410_TCFG1_MUX_MASK << shift);
	__raw_writel(tcfg1 \| bits, S3C2410_TCFG1);

	local_irq_restore(flags);

	return 0;
	}

	static struct clk clk_tin[] = {
	[0] = {
	.name = "pwm-tin",
	.id = 0,
	.set_parent = clk_pwm_tin_set_parent,
	},
	[1] = {
	.name = "pwm-tin",
	.id = 1,
	.set_parent = clk_pwm_tin_set_parent,
	},
	[2] = {
	.name = "pwm-tin",
	.id = 2,
	.set_parent = clk_pwm_tin_set_parent,
	},
	[3] = {
	.name = "pwm-tin",
	.id = 3,
	.set_parent = clk_pwm_tin_set_parent,
	},
	[4] = {
	.name = "pwm-tin",
	.id = 4,
	.set_parent = clk_pwm_tin_set_parent,
	},
	};

	static __init int clk_pwm_tin_register(struct clk *pwm)
	{
	unsigned long tcfg1 = __raw_readl(S3C2410_TCFG1);
	unsigned int id = pwm->id;

	struct clk *parent;
	int ret;

	ret = s3c24xx_register_clock(pwm);
	if (ret < 0)
	return ret;

	tcfg1 >>= S3C2410_TCFG1_SHIFT(id);
	tcfg1 &= S3C2410_TCFG1_MUX_MASK;

	if (tcfg1 == S3C2410_TCFG1_MUX_TCLK)
	parent = s3c24xx_pwmclk_tclk(id);
	else
	parent = s3c24xx_pwmclk_tdiv(id);

	return clk_set_parent(pwm, parent);
	}

	static __init int s3c24xx_pwmclk_init(void)
	{
	struct clk *clk_timers;
	unsigned int clk;
	int ret;

	clk_timers = clk_get(NULL, "timers");
	if (IS_ERR(clk_timers)) {
	printk(KERN_ERR "%s: no parent clock\n", __func__);
	return -EINVAL;
	}

	for (clk = 0; clk < ARRAY_SIZE(clk_timer_scaler); clk++) {
	clk_timer_scaler[clk].parent = clk_timers;
	ret = s3c24xx_register_clock(&clk_timer_scaler[clk]);
	if (ret < 0) {
	printk(KERN_ERR "error adding pwm scaler%d clock\n", clk);
	goto err;
	}
	}

	for (clk = 0; clk < ARRAY_SIZE(clk_timer_tclk); clk++) {
	ret = s3c24xx_register_clock(&clk_timer_tclk[clk]);
	if (ret < 0) {
	printk(KERN_ERR "error adding pww tclk%d\n", clk);
	goto err;
	}
	}

	for (clk = 0; clk < ARRAY_SIZE(clk_timer_tdiv); clk++) {
	ret = clk_pwm_tdiv_register(clk);
	if (ret < 0) {
	printk(KERN_ERR "error adding pwm%d tdiv clock\n", clk);
	goto err;
	}
	}

	for (clk = 0; clk < ARRAY_SIZE(clk_tin); clk++) {
	ret = clk_pwm_tin_register(&clk_tin[clk]);
	if (ret < 0) {
	printk(KERN_ERR "error adding pwm%d tin clock\n", clk);
	goto err;
	}
	}

	return 0;

	err:
	return ret;
	}

	arch_initcall(s3c24xx_pwmclk_init);